1 /* Output Dwarf2 format symbol table information from GCC.
2 Copyright (C) 1992, 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 Contributed by Gary Funck (gary@intrepid.com).
5 Derived from DWARF 1 implementation of Ron Guilmette (rfg@monkeys.com).
6 Extensively modified by Jason Merrill (jason@cygnus.com).
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 2, or (at your option) any later
15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING. If not, write to the Free
22 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
25 /* TODO: Emit .debug_line header even when there are no functions, since
26 the file numbers are used by .debug_info. Alternately, leave
27 out locations for types and decls.
28 Avoid talking about ctors and op= for PODs.
29 Factor out common prologue sequences into multiple CIEs. */
31 /* The first part of this file deals with the DWARF 2 frame unwind
32 information, which is also used by the GCC efficient exception handling
33 mechanism. The second part, controlled only by an #ifdef
34 DWARF2_DEBUGGING_INFO, deals with the other DWARF 2 debugging
39 #include "coretypes.h"
46 #include "hard-reg-set.h"
48 #include "insn-config.h"
56 #include "dwarf2out.h"
57 #include "dwarf2asm.h"
63 #include "diagnostic.h"
66 #include "langhooks.h"
71 #ifdef DWARF2_DEBUGGING_INFO
72 static void dwarf2out_source_line (unsigned int, const char *);
75 /* DWARF2 Abbreviation Glossary:
76 CFA = Canonical Frame Address
77 a fixed address on the stack which identifies a call frame.
78 We define it to be the value of SP just before the call insn.
79 The CFA register and offset, which may change during the course
80 of the function, are used to calculate its value at runtime.
81 CFI = Call Frame Instruction
82 an instruction for the DWARF2 abstract machine
83 CIE = Common Information Entry
84 information describing information common to one or more FDEs
85 DIE = Debugging Information Entry
86 FDE = Frame Description Entry
87 information describing the stack call frame, in particular,
88 how to restore registers
90 DW_CFA_... = DWARF2 CFA call frame instruction
91 DW_TAG_... = DWARF2 DIE tag */
93 #ifndef DWARF2_FRAME_INFO
94 # ifdef DWARF2_DEBUGGING_INFO
95 # define DWARF2_FRAME_INFO \
96 (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
98 # define DWARF2_FRAME_INFO 0
102 /* Map register numbers held in the call frame info that gcc has
103 collected using DWARF_FRAME_REGNUM to those that should be output in
104 .debug_frame and .eh_frame. */
105 #ifndef DWARF2_FRAME_REG_OUT
106 #define DWARF2_FRAME_REG_OUT(REGNO, FOR_EH) (REGNO)
109 /* Decide whether we want to emit frame unwind information for the current
113 dwarf2out_do_frame (void)
115 /* We want to emit correct CFA location expressions or lists, so we
116 have to return true if we're going to output debug info, even if
117 we're not going to output frame or unwind info. */
118 return (write_symbols
== DWARF2_DEBUG
119 || write_symbols
== VMS_AND_DWARF2_DEBUG
121 #ifdef DWARF2_UNWIND_INFO
122 || (DWARF2_UNWIND_INFO
123 && (flag_unwind_tables
124 || (flag_exceptions
&& ! USING_SJLJ_EXCEPTIONS
)))
129 /* The size of the target's pointer type. */
131 #define PTR_SIZE (POINTER_SIZE / BITS_PER_UNIT)
134 /* Array of RTXes referenced by the debugging information, which therefore
135 must be kept around forever. */
136 static GTY(()) VEC(rtx
,gc
) *used_rtx_array
;
138 /* A pointer to the base of a list of incomplete types which might be
139 completed at some later time. incomplete_types_list needs to be a
140 VEC(tree,gc) because we want to tell the garbage collector about
142 static GTY(()) VEC(tree
,gc
) *incomplete_types
;
144 /* A pointer to the base of a table of references to declaration
145 scopes. This table is a display which tracks the nesting
146 of declaration scopes at the current scope and containing
147 scopes. This table is used to find the proper place to
148 define type declaration DIE's. */
149 static GTY(()) VEC(tree
,gc
) *decl_scope_table
;
151 /* Pointers to various DWARF2 sections. */
152 static GTY(()) section
*debug_info_section
;
153 static GTY(()) section
*debug_abbrev_section
;
154 static GTY(()) section
*debug_aranges_section
;
155 static GTY(()) section
*debug_macinfo_section
;
156 static GTY(()) section
*debug_line_section
;
157 static GTY(()) section
*debug_loc_section
;
158 static GTY(()) section
*debug_pubnames_section
;
159 static GTY(()) section
*debug_pubtypes_section
;
160 static GTY(()) section
*debug_str_section
;
161 static GTY(()) section
*debug_ranges_section
;
162 static GTY(()) section
*debug_frame_section
;
164 /* How to start an assembler comment. */
165 #ifndef ASM_COMMENT_START
166 #define ASM_COMMENT_START ";#"
169 typedef struct dw_cfi_struct
*dw_cfi_ref
;
170 typedef struct dw_fde_struct
*dw_fde_ref
;
171 typedef union dw_cfi_oprnd_struct
*dw_cfi_oprnd_ref
;
173 /* Call frames are described using a sequence of Call Frame
174 Information instructions. The register number, offset
175 and address fields are provided as possible operands;
176 their use is selected by the opcode field. */
178 enum dw_cfi_oprnd_type
{
180 dw_cfi_oprnd_reg_num
,
186 typedef union dw_cfi_oprnd_struct
GTY(())
188 unsigned int GTY ((tag ("dw_cfi_oprnd_reg_num"))) dw_cfi_reg_num
;
189 HOST_WIDE_INT
GTY ((tag ("dw_cfi_oprnd_offset"))) dw_cfi_offset
;
190 const char * GTY ((tag ("dw_cfi_oprnd_addr"))) dw_cfi_addr
;
191 struct dw_loc_descr_struct
* GTY ((tag ("dw_cfi_oprnd_loc"))) dw_cfi_loc
;
195 typedef struct dw_cfi_struct
GTY(())
197 dw_cfi_ref dw_cfi_next
;
198 enum dwarf_call_frame_info dw_cfi_opc
;
199 dw_cfi_oprnd
GTY ((desc ("dw_cfi_oprnd1_desc (%1.dw_cfi_opc)")))
201 dw_cfi_oprnd
GTY ((desc ("dw_cfi_oprnd2_desc (%1.dw_cfi_opc)")))
206 /* This is how we define the location of the CFA. We use to handle it
207 as REG + OFFSET all the time, but now it can be more complex.
208 It can now be either REG + CFA_OFFSET or *(REG + BASE_OFFSET) + CFA_OFFSET.
209 Instead of passing around REG and OFFSET, we pass a copy
210 of this structure. */
211 typedef struct cfa_loc
GTY(())
213 HOST_WIDE_INT offset
;
214 HOST_WIDE_INT base_offset
;
216 int indirect
; /* 1 if CFA is accessed via a dereference. */
219 /* All call frame descriptions (FDE's) in the GCC generated DWARF
220 refer to a single Common Information Entry (CIE), defined at
221 the beginning of the .debug_frame section. This use of a single
222 CIE obviates the need to keep track of multiple CIE's
223 in the DWARF generation routines below. */
225 typedef struct dw_fde_struct
GTY(())
228 const char *dw_fde_begin
;
229 const char *dw_fde_current_label
;
230 const char *dw_fde_end
;
231 const char *dw_fde_hot_section_label
;
232 const char *dw_fde_hot_section_end_label
;
233 const char *dw_fde_unlikely_section_label
;
234 const char *dw_fde_unlikely_section_end_label
;
235 bool dw_fde_switched_sections
;
236 dw_cfi_ref dw_fde_cfi
;
237 unsigned funcdef_number
;
238 unsigned all_throwers_are_sibcalls
: 1;
239 unsigned nothrow
: 1;
240 unsigned uses_eh_lsda
: 1;
244 /* Maximum size (in bytes) of an artificially generated label. */
245 #define MAX_ARTIFICIAL_LABEL_BYTES 30
247 /* The size of addresses as they appear in the Dwarf 2 data.
248 Some architectures use word addresses to refer to code locations,
249 but Dwarf 2 info always uses byte addresses. On such machines,
250 Dwarf 2 addresses need to be larger than the architecture's
252 #ifndef DWARF2_ADDR_SIZE
253 #define DWARF2_ADDR_SIZE (POINTER_SIZE / BITS_PER_UNIT)
256 /* The size in bytes of a DWARF field indicating an offset or length
257 relative to a debug info section, specified to be 4 bytes in the
258 DWARF-2 specification. The SGI/MIPS ABI defines it to be the same
261 #ifndef DWARF_OFFSET_SIZE
262 #define DWARF_OFFSET_SIZE 4
265 /* According to the (draft) DWARF 3 specification, the initial length
266 should either be 4 or 12 bytes. When it's 12 bytes, the first 4
267 bytes are 0xffffffff, followed by the length stored in the next 8
270 However, the SGI/MIPS ABI uses an initial length which is equal to
271 DWARF_OFFSET_SIZE. It is defined (elsewhere) accordingly. */
273 #ifndef DWARF_INITIAL_LENGTH_SIZE
274 #define DWARF_INITIAL_LENGTH_SIZE (DWARF_OFFSET_SIZE == 4 ? 4 : 12)
277 #define DWARF_VERSION 2
279 /* Round SIZE up to the nearest BOUNDARY. */
280 #define DWARF_ROUND(SIZE,BOUNDARY) \
281 ((((SIZE) + (BOUNDARY) - 1) / (BOUNDARY)) * (BOUNDARY))
283 /* Offsets recorded in opcodes are a multiple of this alignment factor. */
284 #ifndef DWARF_CIE_DATA_ALIGNMENT
285 #ifdef STACK_GROWS_DOWNWARD
286 #define DWARF_CIE_DATA_ALIGNMENT (-((int) UNITS_PER_WORD))
288 #define DWARF_CIE_DATA_ALIGNMENT ((int) UNITS_PER_WORD)
292 /* CIE identifier. */
293 #if HOST_BITS_PER_WIDE_INT >= 64
294 #define DWARF_CIE_ID \
295 (unsigned HOST_WIDE_INT) (DWARF_OFFSET_SIZE == 4 ? DW_CIE_ID : DW64_CIE_ID)
297 #define DWARF_CIE_ID DW_CIE_ID
300 /* A pointer to the base of a table that contains frame description
301 information for each routine. */
302 static GTY((length ("fde_table_allocated"))) dw_fde_ref fde_table
;
304 /* Number of elements currently allocated for fde_table. */
305 static GTY(()) unsigned fde_table_allocated
;
307 /* Number of elements in fde_table currently in use. */
308 static GTY(()) unsigned fde_table_in_use
;
310 /* Size (in elements) of increments by which we may expand the
312 #define FDE_TABLE_INCREMENT 256
314 /* A list of call frame insns for the CIE. */
315 static GTY(()) dw_cfi_ref cie_cfi_head
;
317 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
318 /* Some DWARF extensions (e.g., MIPS/SGI) implement a subprogram
319 attribute that accelerates the lookup of the FDE associated
320 with the subprogram. This variable holds the table index of the FDE
321 associated with the current function (body) definition. */
322 static unsigned current_funcdef_fde
;
325 struct indirect_string_node
GTY(())
328 unsigned int refcount
;
333 static GTY ((param_is (struct indirect_string_node
))) htab_t debug_str_hash
;
335 static GTY(()) int dw2_string_counter
;
336 static GTY(()) unsigned long dwarf2out_cfi_label_num
;
338 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
340 /* Forward declarations for functions defined in this file. */
342 static char *stripattributes (const char *);
343 static const char *dwarf_cfi_name (unsigned);
344 static dw_cfi_ref
new_cfi (void);
345 static void add_cfi (dw_cfi_ref
*, dw_cfi_ref
);
346 static void add_fde_cfi (const char *, dw_cfi_ref
);
347 static void lookup_cfa_1 (dw_cfi_ref
, dw_cfa_location
*);
348 static void lookup_cfa (dw_cfa_location
*);
349 static void reg_save (const char *, unsigned, unsigned, HOST_WIDE_INT
);
350 static void initial_return_save (rtx
);
351 static HOST_WIDE_INT
stack_adjust_offset (rtx
);
352 static void output_cfi (dw_cfi_ref
, dw_fde_ref
, int);
353 static void output_call_frame_info (int);
354 static void dwarf2out_stack_adjust (rtx
, bool);
355 static void flush_queued_reg_saves (void);
356 static bool clobbers_queued_reg_save (rtx
);
357 static void dwarf2out_frame_debug_expr (rtx
, const char *);
359 /* Support for complex CFA locations. */
360 static void output_cfa_loc (dw_cfi_ref
);
361 static void get_cfa_from_loc_descr (dw_cfa_location
*,
362 struct dw_loc_descr_struct
*);
363 static struct dw_loc_descr_struct
*build_cfa_loc
364 (dw_cfa_location
*, HOST_WIDE_INT
);
365 static void def_cfa_1 (const char *, dw_cfa_location
*);
367 /* How to start an assembler comment. */
368 #ifndef ASM_COMMENT_START
369 #define ASM_COMMENT_START ";#"
372 /* Data and reference forms for relocatable data. */
373 #define DW_FORM_data (DWARF_OFFSET_SIZE == 8 ? DW_FORM_data8 : DW_FORM_data4)
374 #define DW_FORM_ref (DWARF_OFFSET_SIZE == 8 ? DW_FORM_ref8 : DW_FORM_ref4)
376 #ifndef DEBUG_FRAME_SECTION
377 #define DEBUG_FRAME_SECTION ".debug_frame"
380 #ifndef FUNC_BEGIN_LABEL
381 #define FUNC_BEGIN_LABEL "LFB"
384 #ifndef FUNC_END_LABEL
385 #define FUNC_END_LABEL "LFE"
388 #ifndef FRAME_BEGIN_LABEL
389 #define FRAME_BEGIN_LABEL "Lframe"
391 #define CIE_AFTER_SIZE_LABEL "LSCIE"
392 #define CIE_END_LABEL "LECIE"
393 #define FDE_LABEL "LSFDE"
394 #define FDE_AFTER_SIZE_LABEL "LASFDE"
395 #define FDE_END_LABEL "LEFDE"
396 #define LINE_NUMBER_BEGIN_LABEL "LSLT"
397 #define LINE_NUMBER_END_LABEL "LELT"
398 #define LN_PROLOG_AS_LABEL "LASLTP"
399 #define LN_PROLOG_END_LABEL "LELTP"
400 #define DIE_LABEL_PREFIX "DW"
402 /* The DWARF 2 CFA column which tracks the return address. Normally this
403 is the column for PC, or the first column after all of the hard
405 #ifndef DWARF_FRAME_RETURN_COLUMN
407 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (PC_REGNUM)
409 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGISTERS
413 /* The mapping from gcc register number to DWARF 2 CFA column number. By
414 default, we just provide columns for all registers. */
415 #ifndef DWARF_FRAME_REGNUM
416 #define DWARF_FRAME_REGNUM(REG) DBX_REGISTER_NUMBER (REG)
419 /* Hook used by __throw. */
422 expand_builtin_dwarf_sp_column (void)
424 unsigned int dwarf_regnum
= DWARF_FRAME_REGNUM (STACK_POINTER_REGNUM
);
425 return GEN_INT (DWARF2_FRAME_REG_OUT (dwarf_regnum
, 1));
428 /* Return a pointer to a copy of the section string name S with all
429 attributes stripped off, and an asterisk prepended (for assemble_name). */
432 stripattributes (const char *s
)
434 char *stripped
= XNEWVEC (char, strlen (s
) + 2);
439 while (*s
&& *s
!= ',')
446 /* MEM is a memory reference for the register size table, each element of
447 which has mode MODE. Initialize column C as a return address column. */
450 init_return_column_size (enum machine_mode mode
, rtx mem
, unsigned int c
)
452 HOST_WIDE_INT offset
= c
* GET_MODE_SIZE (mode
);
453 HOST_WIDE_INT size
= GET_MODE_SIZE (Pmode
);
454 emit_move_insn (adjust_address (mem
, mode
, offset
), GEN_INT (size
));
457 /* Generate code to initialize the register size table. */
460 expand_builtin_init_dwarf_reg_sizes (tree address
)
463 enum machine_mode mode
= TYPE_MODE (char_type_node
);
464 rtx addr
= expand_normal (address
);
465 rtx mem
= gen_rtx_MEM (BLKmode
, addr
);
466 bool wrote_return_column
= false;
468 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
470 int rnum
= DWARF2_FRAME_REG_OUT (DWARF_FRAME_REGNUM (i
), 1);
472 if (rnum
< DWARF_FRAME_REGISTERS
)
474 HOST_WIDE_INT offset
= rnum
* GET_MODE_SIZE (mode
);
475 enum machine_mode save_mode
= reg_raw_mode
[i
];
478 if (HARD_REGNO_CALL_PART_CLOBBERED (i
, save_mode
))
479 save_mode
= choose_hard_reg_mode (i
, 1, true);
480 if (DWARF_FRAME_REGNUM (i
) == DWARF_FRAME_RETURN_COLUMN
)
482 if (save_mode
== VOIDmode
)
484 wrote_return_column
= true;
486 size
= GET_MODE_SIZE (save_mode
);
490 emit_move_insn (adjust_address (mem
, mode
, offset
),
491 gen_int_mode (size
, mode
));
495 if (!wrote_return_column
)
496 init_return_column_size (mode
, mem
, DWARF_FRAME_RETURN_COLUMN
);
498 #ifdef DWARF_ALT_FRAME_RETURN_COLUMN
499 init_return_column_size (mode
, mem
, DWARF_ALT_FRAME_RETURN_COLUMN
);
502 targetm
.init_dwarf_reg_sizes_extra (address
);
505 /* Convert a DWARF call frame info. operation to its string name */
508 dwarf_cfi_name (unsigned int cfi_opc
)
512 case DW_CFA_advance_loc
:
513 return "DW_CFA_advance_loc";
515 return "DW_CFA_offset";
517 return "DW_CFA_restore";
521 return "DW_CFA_set_loc";
522 case DW_CFA_advance_loc1
:
523 return "DW_CFA_advance_loc1";
524 case DW_CFA_advance_loc2
:
525 return "DW_CFA_advance_loc2";
526 case DW_CFA_advance_loc4
:
527 return "DW_CFA_advance_loc4";
528 case DW_CFA_offset_extended
:
529 return "DW_CFA_offset_extended";
530 case DW_CFA_restore_extended
:
531 return "DW_CFA_restore_extended";
532 case DW_CFA_undefined
:
533 return "DW_CFA_undefined";
534 case DW_CFA_same_value
:
535 return "DW_CFA_same_value";
536 case DW_CFA_register
:
537 return "DW_CFA_register";
538 case DW_CFA_remember_state
:
539 return "DW_CFA_remember_state";
540 case DW_CFA_restore_state
:
541 return "DW_CFA_restore_state";
543 return "DW_CFA_def_cfa";
544 case DW_CFA_def_cfa_register
:
545 return "DW_CFA_def_cfa_register";
546 case DW_CFA_def_cfa_offset
:
547 return "DW_CFA_def_cfa_offset";
550 case DW_CFA_def_cfa_expression
:
551 return "DW_CFA_def_cfa_expression";
552 case DW_CFA_expression
:
553 return "DW_CFA_expression";
554 case DW_CFA_offset_extended_sf
:
555 return "DW_CFA_offset_extended_sf";
556 case DW_CFA_def_cfa_sf
:
557 return "DW_CFA_def_cfa_sf";
558 case DW_CFA_def_cfa_offset_sf
:
559 return "DW_CFA_def_cfa_offset_sf";
561 /* SGI/MIPS specific */
562 case DW_CFA_MIPS_advance_loc8
:
563 return "DW_CFA_MIPS_advance_loc8";
566 case DW_CFA_GNU_window_save
:
567 return "DW_CFA_GNU_window_save";
568 case DW_CFA_GNU_args_size
:
569 return "DW_CFA_GNU_args_size";
570 case DW_CFA_GNU_negative_offset_extended
:
571 return "DW_CFA_GNU_negative_offset_extended";
574 return "DW_CFA_<unknown>";
578 /* Return a pointer to a newly allocated Call Frame Instruction. */
580 static inline dw_cfi_ref
583 dw_cfi_ref cfi
= ggc_alloc (sizeof (dw_cfi_node
));
585 cfi
->dw_cfi_next
= NULL
;
586 cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
= 0;
587 cfi
->dw_cfi_oprnd2
.dw_cfi_reg_num
= 0;
592 /* Add a Call Frame Instruction to list of instructions. */
595 add_cfi (dw_cfi_ref
*list_head
, dw_cfi_ref cfi
)
599 /* Find the end of the chain. */
600 for (p
= list_head
; (*p
) != NULL
; p
= &(*p
)->dw_cfi_next
)
606 /* Generate a new label for the CFI info to refer to. */
609 dwarf2out_cfi_label (void)
611 static char label
[20];
613 ASM_GENERATE_INTERNAL_LABEL (label
, "LCFI", dwarf2out_cfi_label_num
++);
614 ASM_OUTPUT_LABEL (asm_out_file
, label
);
618 /* Add CFI to the current fde at the PC value indicated by LABEL if specified,
619 or to the CIE if LABEL is NULL. */
622 add_fde_cfi (const char *label
, dw_cfi_ref cfi
)
626 dw_fde_ref fde
= &fde_table
[fde_table_in_use
- 1];
629 label
= dwarf2out_cfi_label ();
631 if (fde
->dw_fde_current_label
== NULL
632 || strcmp (label
, fde
->dw_fde_current_label
) != 0)
636 label
= xstrdup (label
);
638 /* Set the location counter to the new label. */
640 /* If we have a current label, advance from there, otherwise
641 set the location directly using set_loc. */
642 xcfi
->dw_cfi_opc
= fde
->dw_fde_current_label
643 ? DW_CFA_advance_loc4
645 xcfi
->dw_cfi_oprnd1
.dw_cfi_addr
= label
;
646 add_cfi (&fde
->dw_fde_cfi
, xcfi
);
648 fde
->dw_fde_current_label
= label
;
651 add_cfi (&fde
->dw_fde_cfi
, cfi
);
655 add_cfi (&cie_cfi_head
, cfi
);
658 /* Subroutine of lookup_cfa. */
661 lookup_cfa_1 (dw_cfi_ref cfi
, dw_cfa_location
*loc
)
663 switch (cfi
->dw_cfi_opc
)
665 case DW_CFA_def_cfa_offset
:
666 loc
->offset
= cfi
->dw_cfi_oprnd1
.dw_cfi_offset
;
668 case DW_CFA_def_cfa_offset_sf
:
670 = cfi
->dw_cfi_oprnd1
.dw_cfi_offset
* DWARF_CIE_DATA_ALIGNMENT
;
672 case DW_CFA_def_cfa_register
:
673 loc
->reg
= cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
;
676 loc
->reg
= cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
;
677 loc
->offset
= cfi
->dw_cfi_oprnd2
.dw_cfi_offset
;
679 case DW_CFA_def_cfa_sf
:
680 loc
->reg
= cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
;
682 = cfi
->dw_cfi_oprnd2
.dw_cfi_offset
* DWARF_CIE_DATA_ALIGNMENT
;
684 case DW_CFA_def_cfa_expression
:
685 get_cfa_from_loc_descr (loc
, cfi
->dw_cfi_oprnd1
.dw_cfi_loc
);
692 /* Find the previous value for the CFA. */
695 lookup_cfa (dw_cfa_location
*loc
)
699 loc
->reg
= INVALID_REGNUM
;
702 loc
->base_offset
= 0;
704 for (cfi
= cie_cfi_head
; cfi
; cfi
= cfi
->dw_cfi_next
)
705 lookup_cfa_1 (cfi
, loc
);
707 if (fde_table_in_use
)
709 dw_fde_ref fde
= &fde_table
[fde_table_in_use
- 1];
710 for (cfi
= fde
->dw_fde_cfi
; cfi
; cfi
= cfi
->dw_cfi_next
)
711 lookup_cfa_1 (cfi
, loc
);
715 /* The current rule for calculating the DWARF2 canonical frame address. */
716 static dw_cfa_location cfa
;
718 /* The register used for saving registers to the stack, and its offset
720 static dw_cfa_location cfa_store
;
722 /* The running total of the size of arguments pushed onto the stack. */
723 static HOST_WIDE_INT args_size
;
725 /* The last args_size we actually output. */
726 static HOST_WIDE_INT old_args_size
;
728 /* Entry point to update the canonical frame address (CFA).
729 LABEL is passed to add_fde_cfi. The value of CFA is now to be
730 calculated from REG+OFFSET. */
733 dwarf2out_def_cfa (const char *label
, unsigned int reg
, HOST_WIDE_INT offset
)
740 def_cfa_1 (label
, &loc
);
743 /* Determine if two dw_cfa_location structures define the same data. */
746 cfa_equal_p (const dw_cfa_location
*loc1
, const dw_cfa_location
*loc2
)
748 return (loc1
->reg
== loc2
->reg
749 && loc1
->offset
== loc2
->offset
750 && loc1
->indirect
== loc2
->indirect
751 && (loc1
->indirect
== 0
752 || loc1
->base_offset
== loc2
->base_offset
));
755 /* This routine does the actual work. The CFA is now calculated from
756 the dw_cfa_location structure. */
759 def_cfa_1 (const char *label
, dw_cfa_location
*loc_p
)
762 dw_cfa_location old_cfa
, loc
;
767 if (cfa_store
.reg
== loc
.reg
&& loc
.indirect
== 0)
768 cfa_store
.offset
= loc
.offset
;
770 loc
.reg
= DWARF_FRAME_REGNUM (loc
.reg
);
771 lookup_cfa (&old_cfa
);
773 /* If nothing changed, no need to issue any call frame instructions. */
774 if (cfa_equal_p (&loc
, &old_cfa
))
779 if (loc
.reg
== old_cfa
.reg
&& !loc
.indirect
)
781 /* Construct a "DW_CFA_def_cfa_offset <offset>" instruction, indicating
782 the CFA register did not change but the offset did. */
785 HOST_WIDE_INT f_offset
= loc
.offset
/ DWARF_CIE_DATA_ALIGNMENT
;
786 gcc_assert (f_offset
* DWARF_CIE_DATA_ALIGNMENT
== loc
.offset
);
788 cfi
->dw_cfi_opc
= DW_CFA_def_cfa_offset_sf
;
789 cfi
->dw_cfi_oprnd1
.dw_cfi_offset
= f_offset
;
793 cfi
->dw_cfi_opc
= DW_CFA_def_cfa_offset
;
794 cfi
->dw_cfi_oprnd1
.dw_cfi_offset
= loc
.offset
;
798 #ifndef MIPS_DEBUGGING_INFO /* SGI dbx thinks this means no offset. */
799 else if (loc
.offset
== old_cfa
.offset
800 && old_cfa
.reg
!= INVALID_REGNUM
803 /* Construct a "DW_CFA_def_cfa_register <register>" instruction,
804 indicating the CFA register has changed to <register> but the
805 offset has not changed. */
806 cfi
->dw_cfi_opc
= DW_CFA_def_cfa_register
;
807 cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
= loc
.reg
;
811 else if (loc
.indirect
== 0)
813 /* Construct a "DW_CFA_def_cfa <register> <offset>" instruction,
814 indicating the CFA register has changed to <register> with
815 the specified offset. */
818 HOST_WIDE_INT f_offset
= loc
.offset
/ DWARF_CIE_DATA_ALIGNMENT
;
819 gcc_assert (f_offset
* DWARF_CIE_DATA_ALIGNMENT
== loc
.offset
);
821 cfi
->dw_cfi_opc
= DW_CFA_def_cfa_sf
;
822 cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
= loc
.reg
;
823 cfi
->dw_cfi_oprnd2
.dw_cfi_offset
= f_offset
;
827 cfi
->dw_cfi_opc
= DW_CFA_def_cfa
;
828 cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
= loc
.reg
;
829 cfi
->dw_cfi_oprnd2
.dw_cfi_offset
= loc
.offset
;
834 /* Construct a DW_CFA_def_cfa_expression instruction to
835 calculate the CFA using a full location expression since no
836 register-offset pair is available. */
837 struct dw_loc_descr_struct
*loc_list
;
839 cfi
->dw_cfi_opc
= DW_CFA_def_cfa_expression
;
840 loc_list
= build_cfa_loc (&loc
, 0);
841 cfi
->dw_cfi_oprnd1
.dw_cfi_loc
= loc_list
;
844 add_fde_cfi (label
, cfi
);
847 /* Add the CFI for saving a register. REG is the CFA column number.
848 LABEL is passed to add_fde_cfi.
849 If SREG is -1, the register is saved at OFFSET from the CFA;
850 otherwise it is saved in SREG. */
853 reg_save (const char *label
, unsigned int reg
, unsigned int sreg
, HOST_WIDE_INT offset
)
855 dw_cfi_ref cfi
= new_cfi ();
857 cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
= reg
;
859 if (sreg
== INVALID_REGNUM
)
862 /* The register number won't fit in 6 bits, so we have to use
864 cfi
->dw_cfi_opc
= DW_CFA_offset_extended
;
866 cfi
->dw_cfi_opc
= DW_CFA_offset
;
868 #ifdef ENABLE_CHECKING
870 /* If we get an offset that is not a multiple of
871 DWARF_CIE_DATA_ALIGNMENT, there is either a bug in the
872 definition of DWARF_CIE_DATA_ALIGNMENT, or a bug in the machine
874 HOST_WIDE_INT check_offset
= offset
/ DWARF_CIE_DATA_ALIGNMENT
;
876 gcc_assert (check_offset
* DWARF_CIE_DATA_ALIGNMENT
== offset
);
879 offset
/= DWARF_CIE_DATA_ALIGNMENT
;
881 cfi
->dw_cfi_opc
= DW_CFA_offset_extended_sf
;
883 cfi
->dw_cfi_oprnd2
.dw_cfi_offset
= offset
;
885 else if (sreg
== reg
)
886 cfi
->dw_cfi_opc
= DW_CFA_same_value
;
889 cfi
->dw_cfi_opc
= DW_CFA_register
;
890 cfi
->dw_cfi_oprnd2
.dw_cfi_reg_num
= sreg
;
893 add_fde_cfi (label
, cfi
);
896 /* Add the CFI for saving a register window. LABEL is passed to reg_save.
897 This CFI tells the unwinder that it needs to restore the window registers
898 from the previous frame's window save area.
900 ??? Perhaps we should note in the CIE where windows are saved (instead of
901 assuming 0(cfa)) and what registers are in the window. */
904 dwarf2out_window_save (const char *label
)
906 dw_cfi_ref cfi
= new_cfi ();
908 cfi
->dw_cfi_opc
= DW_CFA_GNU_window_save
;
909 add_fde_cfi (label
, cfi
);
912 /* Add a CFI to update the running total of the size of arguments
913 pushed onto the stack. */
916 dwarf2out_args_size (const char *label
, HOST_WIDE_INT size
)
920 if (size
== old_args_size
)
923 old_args_size
= size
;
926 cfi
->dw_cfi_opc
= DW_CFA_GNU_args_size
;
927 cfi
->dw_cfi_oprnd1
.dw_cfi_offset
= size
;
928 add_fde_cfi (label
, cfi
);
931 /* Entry point for saving a register to the stack. REG is the GCC register
932 number. LABEL and OFFSET are passed to reg_save. */
935 dwarf2out_reg_save (const char *label
, unsigned int reg
, HOST_WIDE_INT offset
)
937 reg_save (label
, DWARF_FRAME_REGNUM (reg
), INVALID_REGNUM
, offset
);
940 /* Entry point for saving the return address in the stack.
941 LABEL and OFFSET are passed to reg_save. */
944 dwarf2out_return_save (const char *label
, HOST_WIDE_INT offset
)
946 reg_save (label
, DWARF_FRAME_RETURN_COLUMN
, INVALID_REGNUM
, offset
);
949 /* Entry point for saving the return address in a register.
950 LABEL and SREG are passed to reg_save. */
953 dwarf2out_return_reg (const char *label
, unsigned int sreg
)
955 reg_save (label
, DWARF_FRAME_RETURN_COLUMN
, DWARF_FRAME_REGNUM (sreg
), 0);
958 /* Record the initial position of the return address. RTL is
959 INCOMING_RETURN_ADDR_RTX. */
962 initial_return_save (rtx rtl
)
964 unsigned int reg
= INVALID_REGNUM
;
965 HOST_WIDE_INT offset
= 0;
967 switch (GET_CODE (rtl
))
970 /* RA is in a register. */
971 reg
= DWARF_FRAME_REGNUM (REGNO (rtl
));
975 /* RA is on the stack. */
977 switch (GET_CODE (rtl
))
980 gcc_assert (REGNO (rtl
) == STACK_POINTER_REGNUM
);
985 gcc_assert (REGNO (XEXP (rtl
, 0)) == STACK_POINTER_REGNUM
);
986 offset
= INTVAL (XEXP (rtl
, 1));
990 gcc_assert (REGNO (XEXP (rtl
, 0)) == STACK_POINTER_REGNUM
);
991 offset
= -INTVAL (XEXP (rtl
, 1));
1001 /* The return address is at some offset from any value we can
1002 actually load. For instance, on the SPARC it is in %i7+8. Just
1003 ignore the offset for now; it doesn't matter for unwinding frames. */
1004 gcc_assert (GET_CODE (XEXP (rtl
, 1)) == CONST_INT
);
1005 initial_return_save (XEXP (rtl
, 0));
1012 if (reg
!= DWARF_FRAME_RETURN_COLUMN
)
1013 reg_save (NULL
, DWARF_FRAME_RETURN_COLUMN
, reg
, offset
- cfa
.offset
);
1016 /* Given a SET, calculate the amount of stack adjustment it
1019 static HOST_WIDE_INT
1020 stack_adjust_offset (rtx pattern
)
1022 rtx src
= SET_SRC (pattern
);
1023 rtx dest
= SET_DEST (pattern
);
1024 HOST_WIDE_INT offset
= 0;
1027 if (dest
== stack_pointer_rtx
)
1029 /* (set (reg sp) (plus (reg sp) (const_int))) */
1030 code
= GET_CODE (src
);
1031 if (! (code
== PLUS
|| code
== MINUS
)
1032 || XEXP (src
, 0) != stack_pointer_rtx
1033 || GET_CODE (XEXP (src
, 1)) != CONST_INT
)
1036 offset
= INTVAL (XEXP (src
, 1));
1040 else if (MEM_P (dest
))
1042 /* (set (mem (pre_dec (reg sp))) (foo)) */
1043 src
= XEXP (dest
, 0);
1044 code
= GET_CODE (src
);
1050 if (XEXP (src
, 0) == stack_pointer_rtx
)
1052 rtx val
= XEXP (XEXP (src
, 1), 1);
1053 /* We handle only adjustments by constant amount. */
1054 gcc_assert (GET_CODE (XEXP (src
, 1)) == PLUS
1055 && GET_CODE (val
) == CONST_INT
);
1056 offset
= -INTVAL (val
);
1063 if (XEXP (src
, 0) == stack_pointer_rtx
)
1065 offset
= GET_MODE_SIZE (GET_MODE (dest
));
1072 if (XEXP (src
, 0) == stack_pointer_rtx
)
1074 offset
= -GET_MODE_SIZE (GET_MODE (dest
));
1089 /* Check INSN to see if it looks like a push or a stack adjustment, and
1090 make a note of it if it does. EH uses this information to find out how
1091 much extra space it needs to pop off the stack. */
1094 dwarf2out_stack_adjust (rtx insn
, bool after_p
)
1096 HOST_WIDE_INT offset
;
1100 /* Don't handle epilogues at all. Certainly it would be wrong to do so
1101 with this function. Proper support would require all frame-related
1102 insns to be marked, and to be able to handle saving state around
1103 epilogues textually in the middle of the function. */
1104 if (prologue_epilogue_contains (insn
) || sibcall_epilogue_contains (insn
))
1107 /* If only calls can throw, and we have a frame pointer,
1108 save up adjustments until we see the CALL_INSN. */
1109 if (!flag_asynchronous_unwind_tables
&& cfa
.reg
!= STACK_POINTER_REGNUM
)
1111 if (CALL_P (insn
) && !after_p
)
1113 /* Extract the size of the args from the CALL rtx itself. */
1114 insn
= PATTERN (insn
);
1115 if (GET_CODE (insn
) == PARALLEL
)
1116 insn
= XVECEXP (insn
, 0, 0);
1117 if (GET_CODE (insn
) == SET
)
1118 insn
= SET_SRC (insn
);
1119 gcc_assert (GET_CODE (insn
) == CALL
);
1120 dwarf2out_args_size ("", INTVAL (XEXP (insn
, 1)));
1125 if (CALL_P (insn
) && !after_p
)
1127 if (!flag_asynchronous_unwind_tables
)
1128 dwarf2out_args_size ("", args_size
);
1131 else if (BARRIER_P (insn
))
1133 /* When we see a BARRIER, we know to reset args_size to 0. Usually
1134 the compiler will have already emitted a stack adjustment, but
1135 doesn't bother for calls to noreturn functions. */
1136 #ifdef STACK_GROWS_DOWNWARD
1137 offset
= -args_size
;
1142 else if (GET_CODE (PATTERN (insn
)) == SET
)
1143 offset
= stack_adjust_offset (PATTERN (insn
));
1144 else if (GET_CODE (PATTERN (insn
)) == PARALLEL
1145 || GET_CODE (PATTERN (insn
)) == SEQUENCE
)
1147 /* There may be stack adjustments inside compound insns. Search
1149 for (offset
= 0, i
= XVECLEN (PATTERN (insn
), 0) - 1; i
>= 0; i
--)
1150 if (GET_CODE (XVECEXP (PATTERN (insn
), 0, i
)) == SET
)
1151 offset
+= stack_adjust_offset (XVECEXP (PATTERN (insn
), 0, i
));
1159 if (cfa
.reg
== STACK_POINTER_REGNUM
)
1160 cfa
.offset
+= offset
;
1162 #ifndef STACK_GROWS_DOWNWARD
1166 args_size
+= offset
;
1170 label
= dwarf2out_cfi_label ();
1171 def_cfa_1 (label
, &cfa
);
1172 if (flag_asynchronous_unwind_tables
)
1173 dwarf2out_args_size (label
, args_size
);
1178 /* We delay emitting a register save until either (a) we reach the end
1179 of the prologue or (b) the register is clobbered. This clusters
1180 register saves so that there are fewer pc advances. */
1182 struct queued_reg_save
GTY(())
1184 struct queued_reg_save
*next
;
1186 HOST_WIDE_INT cfa_offset
;
1190 static GTY(()) struct queued_reg_save
*queued_reg_saves
;
1192 /* The caller's ORIG_REG is saved in SAVED_IN_REG. */
1193 struct reg_saved_in_data
GTY(()) {
1198 /* A list of registers saved in other registers.
1199 The list intentionally has a small maximum capacity of 4; if your
1200 port needs more than that, you might consider implementing a
1201 more efficient data structure. */
1202 static GTY(()) struct reg_saved_in_data regs_saved_in_regs
[4];
1203 static GTY(()) size_t num_regs_saved_in_regs
;
1205 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
1206 static const char *last_reg_save_label
;
1208 /* Add an entry to QUEUED_REG_SAVES saying that REG is now saved at
1209 SREG, or if SREG is NULL then it is saved at OFFSET to the CFA. */
1212 queue_reg_save (const char *label
, rtx reg
, rtx sreg
, HOST_WIDE_INT offset
)
1214 struct queued_reg_save
*q
;
1216 /* Duplicates waste space, but it's also necessary to remove them
1217 for correctness, since the queue gets output in reverse
1219 for (q
= queued_reg_saves
; q
!= NULL
; q
= q
->next
)
1220 if (REGNO (q
->reg
) == REGNO (reg
))
1225 q
= ggc_alloc (sizeof (*q
));
1226 q
->next
= queued_reg_saves
;
1227 queued_reg_saves
= q
;
1231 q
->cfa_offset
= offset
;
1232 q
->saved_reg
= sreg
;
1234 last_reg_save_label
= label
;
1237 /* Output all the entries in QUEUED_REG_SAVES. */
1240 flush_queued_reg_saves (void)
1242 struct queued_reg_save
*q
;
1244 for (q
= queued_reg_saves
; q
; q
= q
->next
)
1247 unsigned int reg
, sreg
;
1249 for (i
= 0; i
< num_regs_saved_in_regs
; i
++)
1250 if (REGNO (regs_saved_in_regs
[i
].orig_reg
) == REGNO (q
->reg
))
1252 if (q
->saved_reg
&& i
== num_regs_saved_in_regs
)
1254 gcc_assert (i
!= ARRAY_SIZE (regs_saved_in_regs
));
1255 num_regs_saved_in_regs
++;
1257 if (i
!= num_regs_saved_in_regs
)
1259 regs_saved_in_regs
[i
].orig_reg
= q
->reg
;
1260 regs_saved_in_regs
[i
].saved_in_reg
= q
->saved_reg
;
1263 reg
= DWARF_FRAME_REGNUM (REGNO (q
->reg
));
1265 sreg
= DWARF_FRAME_REGNUM (REGNO (q
->saved_reg
));
1267 sreg
= INVALID_REGNUM
;
1268 reg_save (last_reg_save_label
, reg
, sreg
, q
->cfa_offset
);
1271 queued_reg_saves
= NULL
;
1272 last_reg_save_label
= NULL
;
1275 /* Does INSN clobber any register which QUEUED_REG_SAVES lists a saved
1276 location for? Or, does it clobber a register which we've previously
1277 said that some other register is saved in, and for which we now
1278 have a new location for? */
1281 clobbers_queued_reg_save (rtx insn
)
1283 struct queued_reg_save
*q
;
1285 for (q
= queued_reg_saves
; q
; q
= q
->next
)
1288 if (modified_in_p (q
->reg
, insn
))
1290 for (i
= 0; i
< num_regs_saved_in_regs
; i
++)
1291 if (REGNO (q
->reg
) == REGNO (regs_saved_in_regs
[i
].orig_reg
)
1292 && modified_in_p (regs_saved_in_regs
[i
].saved_in_reg
, insn
))
1299 /* Entry point for saving the first register into the second. */
1302 dwarf2out_reg_save_reg (const char *label
, rtx reg
, rtx sreg
)
1305 unsigned int regno
, sregno
;
1307 for (i
= 0; i
< num_regs_saved_in_regs
; i
++)
1308 if (REGNO (regs_saved_in_regs
[i
].orig_reg
) == REGNO (reg
))
1310 if (i
== num_regs_saved_in_regs
)
1312 gcc_assert (i
!= ARRAY_SIZE (regs_saved_in_regs
));
1313 num_regs_saved_in_regs
++;
1315 regs_saved_in_regs
[i
].orig_reg
= reg
;
1316 regs_saved_in_regs
[i
].saved_in_reg
= sreg
;
1318 regno
= DWARF_FRAME_REGNUM (REGNO (reg
));
1319 sregno
= DWARF_FRAME_REGNUM (REGNO (sreg
));
1320 reg_save (label
, regno
, sregno
, 0);
1323 /* What register, if any, is currently saved in REG? */
1326 reg_saved_in (rtx reg
)
1328 unsigned int regn
= REGNO (reg
);
1330 struct queued_reg_save
*q
;
1332 for (q
= queued_reg_saves
; q
; q
= q
->next
)
1333 if (q
->saved_reg
&& regn
== REGNO (q
->saved_reg
))
1336 for (i
= 0; i
< num_regs_saved_in_regs
; i
++)
1337 if (regs_saved_in_regs
[i
].saved_in_reg
1338 && regn
== REGNO (regs_saved_in_regs
[i
].saved_in_reg
))
1339 return regs_saved_in_regs
[i
].orig_reg
;
1345 /* A temporary register holding an integral value used in adjusting SP
1346 or setting up the store_reg. The "offset" field holds the integer
1347 value, not an offset. */
1348 static dw_cfa_location cfa_temp
;
1350 /* Record call frame debugging information for an expression EXPR,
1351 which either sets SP or FP (adjusting how we calculate the frame
1352 address) or saves a register to the stack or another register.
1353 LABEL indicates the address of EXPR.
1355 This function encodes a state machine mapping rtxes to actions on
1356 cfa, cfa_store, and cfa_temp.reg. We describe these rules so
1357 users need not read the source code.
1359 The High-Level Picture
1361 Changes in the register we use to calculate the CFA: Currently we
1362 assume that if you copy the CFA register into another register, we
1363 should take the other one as the new CFA register; this seems to
1364 work pretty well. If it's wrong for some target, it's simple
1365 enough not to set RTX_FRAME_RELATED_P on the insn in question.
1367 Changes in the register we use for saving registers to the stack:
1368 This is usually SP, but not always. Again, we deduce that if you
1369 copy SP into another register (and SP is not the CFA register),
1370 then the new register is the one we will be using for register
1371 saves. This also seems to work.
1373 Register saves: There's not much guesswork about this one; if
1374 RTX_FRAME_RELATED_P is set on an insn which modifies memory, it's a
1375 register save, and the register used to calculate the destination
1376 had better be the one we think we're using for this purpose.
1377 It's also assumed that a copy from a call-saved register to another
1378 register is saving that register if RTX_FRAME_RELATED_P is set on
1379 that instruction. If the copy is from a call-saved register to
1380 the *same* register, that means that the register is now the same
1381 value as in the caller.
1383 Except: If the register being saved is the CFA register, and the
1384 offset is nonzero, we are saving the CFA, so we assume we have to
1385 use DW_CFA_def_cfa_expression. If the offset is 0, we assume that
1386 the intent is to save the value of SP from the previous frame.
1388 In addition, if a register has previously been saved to a different
1391 Invariants / Summaries of Rules
1393 cfa current rule for calculating the CFA. It usually
1394 consists of a register and an offset.
1395 cfa_store register used by prologue code to save things to the stack
1396 cfa_store.offset is the offset from the value of
1397 cfa_store.reg to the actual CFA
1398 cfa_temp register holding an integral value. cfa_temp.offset
1399 stores the value, which will be used to adjust the
1400 stack pointer. cfa_temp is also used like cfa_store,
1401 to track stores to the stack via fp or a temp reg.
1403 Rules 1- 4: Setting a register's value to cfa.reg or an expression
1404 with cfa.reg as the first operand changes the cfa.reg and its
1405 cfa.offset. Rule 1 and 4 also set cfa_temp.reg and
1408 Rules 6- 9: Set a non-cfa.reg register value to a constant or an
1409 expression yielding a constant. This sets cfa_temp.reg
1410 and cfa_temp.offset.
1412 Rule 5: Create a new register cfa_store used to save items to the
1415 Rules 10-14: Save a register to the stack. Define offset as the
1416 difference of the original location and cfa_store's
1417 location (or cfa_temp's location if cfa_temp is used).
1421 "{a,b}" indicates a choice of a xor b.
1422 "<reg>:cfa.reg" indicates that <reg> must equal cfa.reg.
1425 (set <reg1> <reg2>:cfa.reg)
1426 effects: cfa.reg = <reg1>
1427 cfa.offset unchanged
1428 cfa_temp.reg = <reg1>
1429 cfa_temp.offset = cfa.offset
1432 (set sp ({minus,plus,losum} {sp,fp}:cfa.reg
1433 {<const_int>,<reg>:cfa_temp.reg}))
1434 effects: cfa.reg = sp if fp used
1435 cfa.offset += {+/- <const_int>, cfa_temp.offset} if cfa.reg==sp
1436 cfa_store.offset += {+/- <const_int>, cfa_temp.offset}
1437 if cfa_store.reg==sp
1440 (set fp ({minus,plus,losum} <reg>:cfa.reg <const_int>))
1441 effects: cfa.reg = fp
1442 cfa_offset += +/- <const_int>
1445 (set <reg1> ({plus,losum} <reg2>:cfa.reg <const_int>))
1446 constraints: <reg1> != fp
1448 effects: cfa.reg = <reg1>
1449 cfa_temp.reg = <reg1>
1450 cfa_temp.offset = cfa.offset
1453 (set <reg1> (plus <reg2>:cfa_temp.reg sp:cfa.reg))
1454 constraints: <reg1> != fp
1456 effects: cfa_store.reg = <reg1>
1457 cfa_store.offset = cfa.offset - cfa_temp.offset
1460 (set <reg> <const_int>)
1461 effects: cfa_temp.reg = <reg>
1462 cfa_temp.offset = <const_int>
1465 (set <reg1>:cfa_temp.reg (ior <reg2>:cfa_temp.reg <const_int>))
1466 effects: cfa_temp.reg = <reg1>
1467 cfa_temp.offset |= <const_int>
1470 (set <reg> (high <exp>))
1474 (set <reg> (lo_sum <exp> <const_int>))
1475 effects: cfa_temp.reg = <reg>
1476 cfa_temp.offset = <const_int>
1479 (set (mem (pre_modify sp:cfa_store (???? <reg1> <const_int>))) <reg2>)
1480 effects: cfa_store.offset -= <const_int>
1481 cfa.offset = cfa_store.offset if cfa.reg == sp
1483 cfa.base_offset = -cfa_store.offset
1486 (set (mem ({pre_inc,pre_dec} sp:cfa_store.reg)) <reg>)
1487 effects: cfa_store.offset += -/+ mode_size(mem)
1488 cfa.offset = cfa_store.offset if cfa.reg == sp
1490 cfa.base_offset = -cfa_store.offset
1493 (set (mem ({minus,plus,losum} <reg1>:{cfa_store,cfa_temp} <const_int>))
1496 effects: cfa.reg = <reg1>
1497 cfa.base_offset = -/+ <const_int> - {cfa_store,cfa_temp}.offset
1500 (set (mem <reg1>:{cfa_store,cfa_temp}) <reg2>)
1501 effects: cfa.reg = <reg1>
1502 cfa.base_offset = -{cfa_store,cfa_temp}.offset
1505 (set (mem (postinc <reg1>:cfa_temp <const_int>)) <reg2>)
1506 effects: cfa.reg = <reg1>
1507 cfa.base_offset = -cfa_temp.offset
1508 cfa_temp.offset -= mode_size(mem)
1511 (set <reg> {unspec, unspec_volatile})
1512 effects: target-dependent */
1515 dwarf2out_frame_debug_expr (rtx expr
, const char *label
)
1518 HOST_WIDE_INT offset
;
1520 /* If RTX_FRAME_RELATED_P is set on a PARALLEL, process each member of
1521 the PARALLEL independently. The first element is always processed if
1522 it is a SET. This is for backward compatibility. Other elements
1523 are processed only if they are SETs and the RTX_FRAME_RELATED_P
1524 flag is set in them. */
1525 if (GET_CODE (expr
) == PARALLEL
|| GET_CODE (expr
) == SEQUENCE
)
1528 int limit
= XVECLEN (expr
, 0);
1531 /* PARALLELs have strict read-modify-write semantics, so we
1532 ought to evaluate every rvalue before changing any lvalue.
1533 It's cumbersome to do that in general, but there's an
1534 easy approximation that is enough for all current users:
1535 handle register saves before register assignments. */
1536 if (GET_CODE (expr
) == PARALLEL
)
1537 for (par_index
= 0; par_index
< limit
; par_index
++)
1539 elem
= XVECEXP (expr
, 0, par_index
);
1540 if (GET_CODE (elem
) == SET
1541 && MEM_P (SET_DEST (elem
))
1542 && (RTX_FRAME_RELATED_P (elem
) || par_index
== 0))
1543 dwarf2out_frame_debug_expr (elem
, label
);
1546 for (par_index
= 0; par_index
< limit
; par_index
++)
1548 elem
= XVECEXP (expr
, 0, par_index
);
1549 if (GET_CODE (elem
) == SET
1550 && (!MEM_P (SET_DEST (elem
)) || GET_CODE (expr
) == SEQUENCE
)
1551 && (RTX_FRAME_RELATED_P (elem
) || par_index
== 0))
1552 dwarf2out_frame_debug_expr (elem
, label
);
1557 gcc_assert (GET_CODE (expr
) == SET
);
1559 src
= SET_SRC (expr
);
1560 dest
= SET_DEST (expr
);
1564 rtx rsi
= reg_saved_in (src
);
1569 switch (GET_CODE (dest
))
1572 switch (GET_CODE (src
))
1574 /* Setting FP from SP. */
1576 if (cfa
.reg
== (unsigned) REGNO (src
))
1579 /* Update the CFA rule wrt SP or FP. Make sure src is
1580 relative to the current CFA register.
1582 We used to require that dest be either SP or FP, but the
1583 ARM copies SP to a temporary register, and from there to
1584 FP. So we just rely on the backends to only set
1585 RTX_FRAME_RELATED_P on appropriate insns. */
1586 cfa
.reg
= REGNO (dest
);
1587 cfa_temp
.reg
= cfa
.reg
;
1588 cfa_temp
.offset
= cfa
.offset
;
1592 /* Saving a register in a register. */
1593 gcc_assert (!fixed_regs
[REGNO (dest
)]
1594 /* For the SPARC and its register window. */
1595 || (DWARF_FRAME_REGNUM (REGNO (src
))
1596 == DWARF_FRAME_RETURN_COLUMN
));
1597 queue_reg_save (label
, src
, dest
, 0);
1604 if (dest
== stack_pointer_rtx
)
1608 switch (GET_CODE (XEXP (src
, 1)))
1611 offset
= INTVAL (XEXP (src
, 1));
1614 gcc_assert ((unsigned) REGNO (XEXP (src
, 1))
1616 offset
= cfa_temp
.offset
;
1622 if (XEXP (src
, 0) == hard_frame_pointer_rtx
)
1624 /* Restoring SP from FP in the epilogue. */
1625 gcc_assert (cfa
.reg
== (unsigned) HARD_FRAME_POINTER_REGNUM
);
1626 cfa
.reg
= STACK_POINTER_REGNUM
;
1628 else if (GET_CODE (src
) == LO_SUM
)
1629 /* Assume we've set the source reg of the LO_SUM from sp. */
1632 gcc_assert (XEXP (src
, 0) == stack_pointer_rtx
);
1634 if (GET_CODE (src
) != MINUS
)
1636 if (cfa
.reg
== STACK_POINTER_REGNUM
)
1637 cfa
.offset
+= offset
;
1638 if (cfa_store
.reg
== STACK_POINTER_REGNUM
)
1639 cfa_store
.offset
+= offset
;
1641 else if (dest
== hard_frame_pointer_rtx
)
1644 /* Either setting the FP from an offset of the SP,
1645 or adjusting the FP */
1646 gcc_assert (frame_pointer_needed
);
1648 gcc_assert (REG_P (XEXP (src
, 0))
1649 && (unsigned) REGNO (XEXP (src
, 0)) == cfa
.reg
1650 && GET_CODE (XEXP (src
, 1)) == CONST_INT
);
1651 offset
= INTVAL (XEXP (src
, 1));
1652 if (GET_CODE (src
) != MINUS
)
1654 cfa
.offset
+= offset
;
1655 cfa
.reg
= HARD_FRAME_POINTER_REGNUM
;
1659 gcc_assert (GET_CODE (src
) != MINUS
);
1662 if (REG_P (XEXP (src
, 0))
1663 && REGNO (XEXP (src
, 0)) == cfa
.reg
1664 && GET_CODE (XEXP (src
, 1)) == CONST_INT
)
1666 /* Setting a temporary CFA register that will be copied
1667 into the FP later on. */
1668 offset
= - INTVAL (XEXP (src
, 1));
1669 cfa
.offset
+= offset
;
1670 cfa
.reg
= REGNO (dest
);
1671 /* Or used to save regs to the stack. */
1672 cfa_temp
.reg
= cfa
.reg
;
1673 cfa_temp
.offset
= cfa
.offset
;
1677 else if (REG_P (XEXP (src
, 0))
1678 && REGNO (XEXP (src
, 0)) == cfa_temp
.reg
1679 && XEXP (src
, 1) == stack_pointer_rtx
)
1681 /* Setting a scratch register that we will use instead
1682 of SP for saving registers to the stack. */
1683 gcc_assert (cfa
.reg
== STACK_POINTER_REGNUM
);
1684 cfa_store
.reg
= REGNO (dest
);
1685 cfa_store
.offset
= cfa
.offset
- cfa_temp
.offset
;
1689 else if (GET_CODE (src
) == LO_SUM
1690 && GET_CODE (XEXP (src
, 1)) == CONST_INT
)
1692 cfa_temp
.reg
= REGNO (dest
);
1693 cfa_temp
.offset
= INTVAL (XEXP (src
, 1));
1702 cfa_temp
.reg
= REGNO (dest
);
1703 cfa_temp
.offset
= INTVAL (src
);
1708 gcc_assert (REG_P (XEXP (src
, 0))
1709 && (unsigned) REGNO (XEXP (src
, 0)) == cfa_temp
.reg
1710 && GET_CODE (XEXP (src
, 1)) == CONST_INT
);
1712 if ((unsigned) REGNO (dest
) != cfa_temp
.reg
)
1713 cfa_temp
.reg
= REGNO (dest
);
1714 cfa_temp
.offset
|= INTVAL (XEXP (src
, 1));
1717 /* Skip over HIGH, assuming it will be followed by a LO_SUM,
1718 which will fill in all of the bits. */
1725 case UNSPEC_VOLATILE
:
1726 gcc_assert (targetm
.dwarf_handle_frame_unspec
);
1727 targetm
.dwarf_handle_frame_unspec (label
, expr
, XINT (src
, 1));
1734 def_cfa_1 (label
, &cfa
);
1738 gcc_assert (REG_P (src
));
1740 /* Saving a register to the stack. Make sure dest is relative to the
1742 switch (GET_CODE (XEXP (dest
, 0)))
1747 /* We can't handle variable size modifications. */
1748 gcc_assert (GET_CODE (XEXP (XEXP (XEXP (dest
, 0), 1), 1))
1750 offset
= -INTVAL (XEXP (XEXP (XEXP (dest
, 0), 1), 1));
1752 gcc_assert (REGNO (XEXP (XEXP (dest
, 0), 0)) == STACK_POINTER_REGNUM
1753 && cfa_store
.reg
== STACK_POINTER_REGNUM
);
1755 cfa_store
.offset
+= offset
;
1756 if (cfa
.reg
== STACK_POINTER_REGNUM
)
1757 cfa
.offset
= cfa_store
.offset
;
1759 offset
= -cfa_store
.offset
;
1765 offset
= GET_MODE_SIZE (GET_MODE (dest
));
1766 if (GET_CODE (XEXP (dest
, 0)) == PRE_INC
)
1769 gcc_assert (REGNO (XEXP (XEXP (dest
, 0), 0)) == STACK_POINTER_REGNUM
1770 && cfa_store
.reg
== STACK_POINTER_REGNUM
);
1772 cfa_store
.offset
+= offset
;
1773 if (cfa
.reg
== STACK_POINTER_REGNUM
)
1774 cfa
.offset
= cfa_store
.offset
;
1776 offset
= -cfa_store
.offset
;
1780 /* With an offset. */
1787 gcc_assert (GET_CODE (XEXP (XEXP (dest
, 0), 1)) == CONST_INT
1788 && REG_P (XEXP (XEXP (dest
, 0), 0)));
1789 offset
= INTVAL (XEXP (XEXP (dest
, 0), 1));
1790 if (GET_CODE (XEXP (dest
, 0)) == MINUS
)
1793 regno
= REGNO (XEXP (XEXP (dest
, 0), 0));
1795 if (cfa_store
.reg
== (unsigned) regno
)
1796 offset
-= cfa_store
.offset
;
1799 gcc_assert (cfa_temp
.reg
== (unsigned) regno
);
1800 offset
-= cfa_temp
.offset
;
1806 /* Without an offset. */
1809 int regno
= REGNO (XEXP (dest
, 0));
1811 if (cfa_store
.reg
== (unsigned) regno
)
1812 offset
= -cfa_store
.offset
;
1815 gcc_assert (cfa_temp
.reg
== (unsigned) regno
);
1816 offset
= -cfa_temp
.offset
;
1823 gcc_assert (cfa_temp
.reg
1824 == (unsigned) REGNO (XEXP (XEXP (dest
, 0), 0)));
1825 offset
= -cfa_temp
.offset
;
1826 cfa_temp
.offset
-= GET_MODE_SIZE (GET_MODE (dest
));
1833 if (REGNO (src
) != STACK_POINTER_REGNUM
1834 && REGNO (src
) != HARD_FRAME_POINTER_REGNUM
1835 && (unsigned) REGNO (src
) == cfa
.reg
)
1837 /* We're storing the current CFA reg into the stack. */
1839 if (cfa
.offset
== 0)
1841 /* If the source register is exactly the CFA, assume
1842 we're saving SP like any other register; this happens
1844 def_cfa_1 (label
, &cfa
);
1845 queue_reg_save (label
, stack_pointer_rtx
, NULL_RTX
, offset
);
1850 /* Otherwise, we'll need to look in the stack to
1851 calculate the CFA. */
1852 rtx x
= XEXP (dest
, 0);
1856 gcc_assert (REG_P (x
));
1858 cfa
.reg
= REGNO (x
);
1859 cfa
.base_offset
= offset
;
1861 def_cfa_1 (label
, &cfa
);
1866 def_cfa_1 (label
, &cfa
);
1867 queue_reg_save (label
, src
, NULL_RTX
, offset
);
1875 /* Record call frame debugging information for INSN, which either
1876 sets SP or FP (adjusting how we calculate the frame address) or saves a
1877 register to the stack. If INSN is NULL_RTX, initialize our state.
1879 If AFTER_P is false, we're being called before the insn is emitted,
1880 otherwise after. Call instructions get invoked twice. */
1883 dwarf2out_frame_debug (rtx insn
, bool after_p
)
1888 if (insn
== NULL_RTX
)
1892 /* Flush any queued register saves. */
1893 flush_queued_reg_saves ();
1895 /* Set up state for generating call frame debug info. */
1898 == (unsigned long)DWARF_FRAME_REGNUM (STACK_POINTER_REGNUM
));
1900 cfa
.reg
= STACK_POINTER_REGNUM
;
1903 cfa_temp
.offset
= 0;
1905 for (i
= 0; i
< num_regs_saved_in_regs
; i
++)
1907 regs_saved_in_regs
[i
].orig_reg
= NULL_RTX
;
1908 regs_saved_in_regs
[i
].saved_in_reg
= NULL_RTX
;
1910 num_regs_saved_in_regs
= 0;
1914 if (!NONJUMP_INSN_P (insn
) || clobbers_queued_reg_save (insn
))
1915 flush_queued_reg_saves ();
1917 if (! RTX_FRAME_RELATED_P (insn
))
1919 if (!ACCUMULATE_OUTGOING_ARGS
)
1920 dwarf2out_stack_adjust (insn
, after_p
);
1924 label
= dwarf2out_cfi_label ();
1925 src
= find_reg_note (insn
, REG_FRAME_RELATED_EXPR
, NULL_RTX
);
1927 insn
= XEXP (src
, 0);
1929 insn
= PATTERN (insn
);
1931 dwarf2out_frame_debug_expr (insn
, label
);
1936 /* Describe for the GTY machinery what parts of dw_cfi_oprnd1 are used. */
1937 static enum dw_cfi_oprnd_type dw_cfi_oprnd1_desc
1938 (enum dwarf_call_frame_info cfi
);
1940 static enum dw_cfi_oprnd_type
1941 dw_cfi_oprnd1_desc (enum dwarf_call_frame_info cfi
)
1946 case DW_CFA_GNU_window_save
:
1947 return dw_cfi_oprnd_unused
;
1949 case DW_CFA_set_loc
:
1950 case DW_CFA_advance_loc1
:
1951 case DW_CFA_advance_loc2
:
1952 case DW_CFA_advance_loc4
:
1953 case DW_CFA_MIPS_advance_loc8
:
1954 return dw_cfi_oprnd_addr
;
1957 case DW_CFA_offset_extended
:
1958 case DW_CFA_def_cfa
:
1959 case DW_CFA_offset_extended_sf
:
1960 case DW_CFA_def_cfa_sf
:
1961 case DW_CFA_restore_extended
:
1962 case DW_CFA_undefined
:
1963 case DW_CFA_same_value
:
1964 case DW_CFA_def_cfa_register
:
1965 case DW_CFA_register
:
1966 return dw_cfi_oprnd_reg_num
;
1968 case DW_CFA_def_cfa_offset
:
1969 case DW_CFA_GNU_args_size
:
1970 case DW_CFA_def_cfa_offset_sf
:
1971 return dw_cfi_oprnd_offset
;
1973 case DW_CFA_def_cfa_expression
:
1974 case DW_CFA_expression
:
1975 return dw_cfi_oprnd_loc
;
1982 /* Describe for the GTY machinery what parts of dw_cfi_oprnd2 are used. */
1983 static enum dw_cfi_oprnd_type dw_cfi_oprnd2_desc
1984 (enum dwarf_call_frame_info cfi
);
1986 static enum dw_cfi_oprnd_type
1987 dw_cfi_oprnd2_desc (enum dwarf_call_frame_info cfi
)
1991 case DW_CFA_def_cfa
:
1992 case DW_CFA_def_cfa_sf
:
1994 case DW_CFA_offset_extended_sf
:
1995 case DW_CFA_offset_extended
:
1996 return dw_cfi_oprnd_offset
;
1998 case DW_CFA_register
:
1999 return dw_cfi_oprnd_reg_num
;
2002 return dw_cfi_oprnd_unused
;
2006 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
2008 /* Switch to eh_frame_section. If we don't have an eh_frame_section,
2009 switch to the data section instead, and write out a synthetic label
2013 switch_to_eh_frame_section (void)
2017 #ifdef EH_FRAME_SECTION_NAME
2018 if (eh_frame_section
== 0)
2022 if (EH_TABLES_CAN_BE_READ_ONLY
)
2028 fde_encoding
= ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/1,
2030 per_encoding
= ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/2,
2032 lsda_encoding
= ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0,
2034 flags
= ((! flag_pic
2035 || ((fde_encoding
& 0x70) != DW_EH_PE_absptr
2036 && (fde_encoding
& 0x70) != DW_EH_PE_aligned
2037 && (per_encoding
& 0x70) != DW_EH_PE_absptr
2038 && (per_encoding
& 0x70) != DW_EH_PE_aligned
2039 && (lsda_encoding
& 0x70) != DW_EH_PE_absptr
2040 && (lsda_encoding
& 0x70) != DW_EH_PE_aligned
))
2041 ? 0 : SECTION_WRITE
);
2044 flags
= SECTION_WRITE
;
2045 eh_frame_section
= get_section (EH_FRAME_SECTION_NAME
, flags
, NULL
);
2049 if (eh_frame_section
)
2050 switch_to_section (eh_frame_section
);
2053 /* We have no special eh_frame section. Put the information in
2054 the data section and emit special labels to guide collect2. */
2055 switch_to_section (data_section
);
2056 label
= get_file_function_name ("F");
2057 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (PTR_SIZE
));
2058 targetm
.asm_out
.globalize_label (asm_out_file
,
2059 IDENTIFIER_POINTER (label
));
2060 ASM_OUTPUT_LABEL (asm_out_file
, IDENTIFIER_POINTER (label
));
2064 /* Output a Call Frame Information opcode and its operand(s). */
2067 output_cfi (dw_cfi_ref cfi
, dw_fde_ref fde
, int for_eh
)
2070 if (cfi
->dw_cfi_opc
== DW_CFA_advance_loc
)
2071 dw2_asm_output_data (1, (cfi
->dw_cfi_opc
2072 | (cfi
->dw_cfi_oprnd1
.dw_cfi_offset
& 0x3f)),
2073 "DW_CFA_advance_loc " HOST_WIDE_INT_PRINT_HEX
,
2074 cfi
->dw_cfi_oprnd1
.dw_cfi_offset
);
2075 else if (cfi
->dw_cfi_opc
== DW_CFA_offset
)
2077 r
= DWARF2_FRAME_REG_OUT (cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
, for_eh
);
2078 dw2_asm_output_data (1, (cfi
->dw_cfi_opc
| (r
& 0x3f)),
2079 "DW_CFA_offset, column 0x%lx", r
);
2080 dw2_asm_output_data_uleb128 (cfi
->dw_cfi_oprnd2
.dw_cfi_offset
, NULL
);
2082 else if (cfi
->dw_cfi_opc
== DW_CFA_restore
)
2084 r
= DWARF2_FRAME_REG_OUT (cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
, for_eh
);
2085 dw2_asm_output_data (1, (cfi
->dw_cfi_opc
| (r
& 0x3f)),
2086 "DW_CFA_restore, column 0x%lx", r
);
2090 dw2_asm_output_data (1, cfi
->dw_cfi_opc
,
2091 "%s", dwarf_cfi_name (cfi
->dw_cfi_opc
));
2093 switch (cfi
->dw_cfi_opc
)
2095 case DW_CFA_set_loc
:
2097 dw2_asm_output_encoded_addr_rtx (
2098 ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/1, /*global=*/0),
2099 gen_rtx_SYMBOL_REF (Pmode
, cfi
->dw_cfi_oprnd1
.dw_cfi_addr
),
2102 dw2_asm_output_addr (DWARF2_ADDR_SIZE
,
2103 cfi
->dw_cfi_oprnd1
.dw_cfi_addr
, NULL
);
2104 fde
->dw_fde_current_label
= cfi
->dw_cfi_oprnd1
.dw_cfi_addr
;
2107 case DW_CFA_advance_loc1
:
2108 dw2_asm_output_delta (1, cfi
->dw_cfi_oprnd1
.dw_cfi_addr
,
2109 fde
->dw_fde_current_label
, NULL
);
2110 fde
->dw_fde_current_label
= cfi
->dw_cfi_oprnd1
.dw_cfi_addr
;
2113 case DW_CFA_advance_loc2
:
2114 dw2_asm_output_delta (2, cfi
->dw_cfi_oprnd1
.dw_cfi_addr
,
2115 fde
->dw_fde_current_label
, NULL
);
2116 fde
->dw_fde_current_label
= cfi
->dw_cfi_oprnd1
.dw_cfi_addr
;
2119 case DW_CFA_advance_loc4
:
2120 dw2_asm_output_delta (4, cfi
->dw_cfi_oprnd1
.dw_cfi_addr
,
2121 fde
->dw_fde_current_label
, NULL
);
2122 fde
->dw_fde_current_label
= cfi
->dw_cfi_oprnd1
.dw_cfi_addr
;
2125 case DW_CFA_MIPS_advance_loc8
:
2126 dw2_asm_output_delta (8, cfi
->dw_cfi_oprnd1
.dw_cfi_addr
,
2127 fde
->dw_fde_current_label
, NULL
);
2128 fde
->dw_fde_current_label
= cfi
->dw_cfi_oprnd1
.dw_cfi_addr
;
2131 case DW_CFA_offset_extended
:
2132 case DW_CFA_def_cfa
:
2133 r
= DWARF2_FRAME_REG_OUT (cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
, for_eh
);
2134 dw2_asm_output_data_uleb128 (r
, NULL
);
2135 dw2_asm_output_data_uleb128 (cfi
->dw_cfi_oprnd2
.dw_cfi_offset
, NULL
);
2138 case DW_CFA_offset_extended_sf
:
2139 case DW_CFA_def_cfa_sf
:
2140 r
= DWARF2_FRAME_REG_OUT (cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
, for_eh
);
2141 dw2_asm_output_data_uleb128 (r
, NULL
);
2142 dw2_asm_output_data_sleb128 (cfi
->dw_cfi_oprnd2
.dw_cfi_offset
, NULL
);
2145 case DW_CFA_restore_extended
:
2146 case DW_CFA_undefined
:
2147 case DW_CFA_same_value
:
2148 case DW_CFA_def_cfa_register
:
2149 r
= DWARF2_FRAME_REG_OUT (cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
, for_eh
);
2150 dw2_asm_output_data_uleb128 (r
, NULL
);
2153 case DW_CFA_register
:
2154 r
= DWARF2_FRAME_REG_OUT (cfi
->dw_cfi_oprnd1
.dw_cfi_reg_num
, for_eh
);
2155 dw2_asm_output_data_uleb128 (r
, NULL
);
2156 r
= DWARF2_FRAME_REG_OUT (cfi
->dw_cfi_oprnd2
.dw_cfi_reg_num
, for_eh
);
2157 dw2_asm_output_data_uleb128 (r
, NULL
);
2160 case DW_CFA_def_cfa_offset
:
2161 case DW_CFA_GNU_args_size
:
2162 dw2_asm_output_data_uleb128 (cfi
->dw_cfi_oprnd1
.dw_cfi_offset
, NULL
);
2165 case DW_CFA_def_cfa_offset_sf
:
2166 dw2_asm_output_data_sleb128 (cfi
->dw_cfi_oprnd1
.dw_cfi_offset
, NULL
);
2169 case DW_CFA_GNU_window_save
:
2172 case DW_CFA_def_cfa_expression
:
2173 case DW_CFA_expression
:
2174 output_cfa_loc (cfi
);
2177 case DW_CFA_GNU_negative_offset_extended
:
2178 /* Obsoleted by DW_CFA_offset_extended_sf. */
2187 /* Output the call frame information used to record information
2188 that relates to calculating the frame pointer, and records the
2189 location of saved registers. */
2192 output_call_frame_info (int for_eh
)
2197 char l1
[20], l2
[20], section_start_label
[20];
2198 bool any_lsda_needed
= false;
2199 char augmentation
[6];
2200 int augmentation_size
;
2201 int fde_encoding
= DW_EH_PE_absptr
;
2202 int per_encoding
= DW_EH_PE_absptr
;
2203 int lsda_encoding
= DW_EH_PE_absptr
;
2206 /* Don't emit a CIE if there won't be any FDEs. */
2207 if (fde_table_in_use
== 0)
2210 /* If we make FDEs linkonce, we may have to emit an empty label for
2211 an FDE that wouldn't otherwise be emitted. We want to avoid
2212 having an FDE kept around when the function it refers to is
2213 discarded. Example where this matters: a primary function
2214 template in C++ requires EH information, but an explicit
2215 specialization doesn't. */
2216 if (TARGET_USES_WEAK_UNWIND_INFO
2217 && ! flag_asynchronous_unwind_tables
2219 for (i
= 0; i
< fde_table_in_use
; i
++)
2220 if ((fde_table
[i
].nothrow
|| fde_table
[i
].all_throwers_are_sibcalls
)
2221 && !fde_table
[i
].uses_eh_lsda
2222 && ! DECL_WEAK (fde_table
[i
].decl
))
2223 targetm
.asm_out
.unwind_label (asm_out_file
, fde_table
[i
].decl
,
2224 for_eh
, /* empty */ 1);
2226 /* If we don't have any functions we'll want to unwind out of, don't
2227 emit any EH unwind information. Note that if exceptions aren't
2228 enabled, we won't have collected nothrow information, and if we
2229 asked for asynchronous tables, we always want this info. */
2232 bool any_eh_needed
= !flag_exceptions
|| flag_asynchronous_unwind_tables
;
2234 for (i
= 0; i
< fde_table_in_use
; i
++)
2235 if (fde_table
[i
].uses_eh_lsda
)
2236 any_eh_needed
= any_lsda_needed
= true;
2237 else if (TARGET_USES_WEAK_UNWIND_INFO
&& DECL_WEAK (fde_table
[i
].decl
))
2238 any_eh_needed
= true;
2239 else if (! fde_table
[i
].nothrow
2240 && ! fde_table
[i
].all_throwers_are_sibcalls
)
2241 any_eh_needed
= true;
2243 if (! any_eh_needed
)
2247 /* We're going to be generating comments, so turn on app. */
2252 switch_to_eh_frame_section ();
2255 if (!debug_frame_section
)
2256 debug_frame_section
= get_section (DEBUG_FRAME_SECTION
,
2257 SECTION_DEBUG
, NULL
);
2258 switch_to_section (debug_frame_section
);
2261 ASM_GENERATE_INTERNAL_LABEL (section_start_label
, FRAME_BEGIN_LABEL
, for_eh
);
2262 ASM_OUTPUT_LABEL (asm_out_file
, section_start_label
);
2264 /* Output the CIE. */
2265 ASM_GENERATE_INTERNAL_LABEL (l1
, CIE_AFTER_SIZE_LABEL
, for_eh
);
2266 ASM_GENERATE_INTERNAL_LABEL (l2
, CIE_END_LABEL
, for_eh
);
2267 if (DWARF_INITIAL_LENGTH_SIZE
- DWARF_OFFSET_SIZE
== 4 && !for_eh
)
2268 dw2_asm_output_data (4, 0xffffffff,
2269 "Initial length escape value indicating 64-bit DWARF extension");
2270 dw2_asm_output_delta (for_eh
? 4 : DWARF_OFFSET_SIZE
, l2
, l1
,
2271 "Length of Common Information Entry");
2272 ASM_OUTPUT_LABEL (asm_out_file
, l1
);
2274 /* Now that the CIE pointer is PC-relative for EH,
2275 use 0 to identify the CIE. */
2276 dw2_asm_output_data ((for_eh
? 4 : DWARF_OFFSET_SIZE
),
2277 (for_eh
? 0 : DWARF_CIE_ID
),
2278 "CIE Identifier Tag");
2280 dw2_asm_output_data (1, DW_CIE_VERSION
, "CIE Version");
2282 augmentation
[0] = 0;
2283 augmentation_size
= 0;
2289 z Indicates that a uleb128 is present to size the
2290 augmentation section.
2291 L Indicates the encoding (and thus presence) of
2292 an LSDA pointer in the FDE augmentation.
2293 R Indicates a non-default pointer encoding for
2295 P Indicates the presence of an encoding + language
2296 personality routine in the CIE augmentation. */
2298 fde_encoding
= ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/1, /*global=*/0);
2299 per_encoding
= ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/2, /*global=*/1);
2300 lsda_encoding
= ASM_PREFERRED_EH_DATA_FORMAT (/*code=*/0, /*global=*/0);
2302 p
= augmentation
+ 1;
2303 if (eh_personality_libfunc
)
2306 augmentation_size
+= 1 + size_of_encoded_value (per_encoding
);
2308 if (any_lsda_needed
)
2311 augmentation_size
+= 1;
2313 if (fde_encoding
!= DW_EH_PE_absptr
)
2316 augmentation_size
+= 1;
2318 if (p
> augmentation
+ 1)
2320 augmentation
[0] = 'z';
2324 /* Ug. Some platforms can't do unaligned dynamic relocations at all. */
2325 if (eh_personality_libfunc
&& per_encoding
== DW_EH_PE_aligned
)
2327 int offset
= ( 4 /* Length */
2329 + 1 /* CIE version */
2330 + strlen (augmentation
) + 1 /* Augmentation */
2331 + size_of_uleb128 (1) /* Code alignment */
2332 + size_of_sleb128 (DWARF_CIE_DATA_ALIGNMENT
)
2334 + 1 /* Augmentation size */
2335 + 1 /* Personality encoding */ );
2336 int pad
= -offset
& (PTR_SIZE
- 1);
2338 augmentation_size
+= pad
;
2340 /* Augmentations should be small, so there's scarce need to
2341 iterate for a solution. Die if we exceed one uleb128 byte. */
2342 gcc_assert (size_of_uleb128 (augmentation_size
) == 1);
2346 dw2_asm_output_nstring (augmentation
, -1, "CIE Augmentation");
2347 dw2_asm_output_data_uleb128 (1, "CIE Code Alignment Factor");
2348 dw2_asm_output_data_sleb128 (DWARF_CIE_DATA_ALIGNMENT
,
2349 "CIE Data Alignment Factor");
2351 return_reg
= DWARF2_FRAME_REG_OUT (DWARF_FRAME_RETURN_COLUMN
, for_eh
);
2352 if (DW_CIE_VERSION
== 1)
2353 dw2_asm_output_data (1, return_reg
, "CIE RA Column");
2355 dw2_asm_output_data_uleb128 (return_reg
, "CIE RA Column");
2357 if (augmentation
[0])
2359 dw2_asm_output_data_uleb128 (augmentation_size
, "Augmentation size");
2360 if (eh_personality_libfunc
)
2362 dw2_asm_output_data (1, per_encoding
, "Personality (%s)",
2363 eh_data_format_name (per_encoding
));
2364 dw2_asm_output_encoded_addr_rtx (per_encoding
,
2365 eh_personality_libfunc
,
2369 if (any_lsda_needed
)
2370 dw2_asm_output_data (1, lsda_encoding
, "LSDA Encoding (%s)",
2371 eh_data_format_name (lsda_encoding
));
2373 if (fde_encoding
!= DW_EH_PE_absptr
)
2374 dw2_asm_output_data (1, fde_encoding
, "FDE Encoding (%s)",
2375 eh_data_format_name (fde_encoding
));
2378 for (cfi
= cie_cfi_head
; cfi
!= NULL
; cfi
= cfi
->dw_cfi_next
)
2379 output_cfi (cfi
, NULL
, for_eh
);
2381 /* Pad the CIE out to an address sized boundary. */
2382 ASM_OUTPUT_ALIGN (asm_out_file
,
2383 floor_log2 (for_eh
? PTR_SIZE
: DWARF2_ADDR_SIZE
));
2384 ASM_OUTPUT_LABEL (asm_out_file
, l2
);
2386 /* Loop through all of the FDE's. */
2387 for (i
= 0; i
< fde_table_in_use
; i
++)
2389 fde
= &fde_table
[i
];
2391 /* Don't emit EH unwind info for leaf functions that don't need it. */
2392 if (for_eh
&& !flag_asynchronous_unwind_tables
&& flag_exceptions
2393 && (fde
->nothrow
|| fde
->all_throwers_are_sibcalls
)
2394 && ! (TARGET_USES_WEAK_UNWIND_INFO
&& DECL_WEAK (fde_table
[i
].decl
))
2395 && !fde
->uses_eh_lsda
)
2398 targetm
.asm_out
.unwind_label (asm_out_file
, fde
->decl
, for_eh
, /* empty */ 0);
2399 targetm
.asm_out
.internal_label (asm_out_file
, FDE_LABEL
, for_eh
+ i
* 2);
2400 ASM_GENERATE_INTERNAL_LABEL (l1
, FDE_AFTER_SIZE_LABEL
, for_eh
+ i
* 2);
2401 ASM_GENERATE_INTERNAL_LABEL (l2
, FDE_END_LABEL
, for_eh
+ i
* 2);
2402 if (DWARF_INITIAL_LENGTH_SIZE
- DWARF_OFFSET_SIZE
== 4 && !for_eh
)
2403 dw2_asm_output_data (4, 0xffffffff,
2404 "Initial length escape value indicating 64-bit DWARF extension");
2405 dw2_asm_output_delta (for_eh
? 4 : DWARF_OFFSET_SIZE
, l2
, l1
,
2407 ASM_OUTPUT_LABEL (asm_out_file
, l1
);
2410 dw2_asm_output_delta (4, l1
, section_start_label
, "FDE CIE offset");
2412 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, section_start_label
,
2413 debug_frame_section
, "FDE CIE offset");
2417 rtx sym_ref
= gen_rtx_SYMBOL_REF (Pmode
, fde
->dw_fde_begin
);
2418 SYMBOL_REF_FLAGS (sym_ref
) |= SYMBOL_FLAG_LOCAL
;
2419 dw2_asm_output_encoded_addr_rtx (fde_encoding
,
2422 "FDE initial location");
2423 if (fde
->dw_fde_switched_sections
)
2425 rtx sym_ref2
= gen_rtx_SYMBOL_REF (Pmode
,
2426 fde
->dw_fde_unlikely_section_label
);
2427 rtx sym_ref3
= gen_rtx_SYMBOL_REF (Pmode
,
2428 fde
->dw_fde_hot_section_label
);
2429 SYMBOL_REF_FLAGS (sym_ref2
) |= SYMBOL_FLAG_LOCAL
;
2430 SYMBOL_REF_FLAGS (sym_ref3
) |= SYMBOL_FLAG_LOCAL
;
2431 dw2_asm_output_encoded_addr_rtx (fde_encoding
, sym_ref3
, false,
2432 "FDE initial location");
2433 dw2_asm_output_delta (size_of_encoded_value (fde_encoding
),
2434 fde
->dw_fde_hot_section_end_label
,
2435 fde
->dw_fde_hot_section_label
,
2436 "FDE address range");
2437 dw2_asm_output_encoded_addr_rtx (fde_encoding
, sym_ref2
, false,
2438 "FDE initial location");
2439 dw2_asm_output_delta (size_of_encoded_value (fde_encoding
),
2440 fde
->dw_fde_unlikely_section_end_label
,
2441 fde
->dw_fde_unlikely_section_label
,
2442 "FDE address range");
2445 dw2_asm_output_delta (size_of_encoded_value (fde_encoding
),
2446 fde
->dw_fde_end
, fde
->dw_fde_begin
,
2447 "FDE address range");
2451 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, fde
->dw_fde_begin
,
2452 "FDE initial location");
2453 if (fde
->dw_fde_switched_sections
)
2455 dw2_asm_output_addr (DWARF2_ADDR_SIZE
,
2456 fde
->dw_fde_hot_section_label
,
2457 "FDE initial location");
2458 dw2_asm_output_delta (DWARF2_ADDR_SIZE
,
2459 fde
->dw_fde_hot_section_end_label
,
2460 fde
->dw_fde_hot_section_label
,
2461 "FDE address range");
2462 dw2_asm_output_addr (DWARF2_ADDR_SIZE
,
2463 fde
->dw_fde_unlikely_section_label
,
2464 "FDE initial location");
2465 dw2_asm_output_delta (DWARF2_ADDR_SIZE
,
2466 fde
->dw_fde_unlikely_section_end_label
,
2467 fde
->dw_fde_unlikely_section_label
,
2468 "FDE address range");
2471 dw2_asm_output_delta (DWARF2_ADDR_SIZE
,
2472 fde
->dw_fde_end
, fde
->dw_fde_begin
,
2473 "FDE address range");
2476 if (augmentation
[0])
2478 if (any_lsda_needed
)
2480 int size
= size_of_encoded_value (lsda_encoding
);
2482 if (lsda_encoding
== DW_EH_PE_aligned
)
2484 int offset
= ( 4 /* Length */
2485 + 4 /* CIE offset */
2486 + 2 * size_of_encoded_value (fde_encoding
)
2487 + 1 /* Augmentation size */ );
2488 int pad
= -offset
& (PTR_SIZE
- 1);
2491 gcc_assert (size_of_uleb128 (size
) == 1);
2494 dw2_asm_output_data_uleb128 (size
, "Augmentation size");
2496 if (fde
->uses_eh_lsda
)
2498 ASM_GENERATE_INTERNAL_LABEL (l1
, "LLSDA",
2499 fde
->funcdef_number
);
2500 dw2_asm_output_encoded_addr_rtx (
2501 lsda_encoding
, gen_rtx_SYMBOL_REF (Pmode
, l1
),
2502 false, "Language Specific Data Area");
2506 if (lsda_encoding
== DW_EH_PE_aligned
)
2507 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (PTR_SIZE
));
2509 (size_of_encoded_value (lsda_encoding
), 0,
2510 "Language Specific Data Area (none)");
2514 dw2_asm_output_data_uleb128 (0, "Augmentation size");
2517 /* Loop through the Call Frame Instructions associated with
2519 fde
->dw_fde_current_label
= fde
->dw_fde_begin
;
2520 for (cfi
= fde
->dw_fde_cfi
; cfi
!= NULL
; cfi
= cfi
->dw_cfi_next
)
2521 output_cfi (cfi
, fde
, for_eh
);
2523 /* Pad the FDE out to an address sized boundary. */
2524 ASM_OUTPUT_ALIGN (asm_out_file
,
2525 floor_log2 ((for_eh
? PTR_SIZE
: DWARF2_ADDR_SIZE
)));
2526 ASM_OUTPUT_LABEL (asm_out_file
, l2
);
2529 if (for_eh
&& targetm
.terminate_dw2_eh_frame_info
)
2530 dw2_asm_output_data (4, 0, "End of Table");
2531 #ifdef MIPS_DEBUGGING_INFO
2532 /* Work around Irix 6 assembler bug whereby labels at the end of a section
2533 get a value of 0. Putting .align 0 after the label fixes it. */
2534 ASM_OUTPUT_ALIGN (asm_out_file
, 0);
2537 /* Turn off app to make assembly quicker. */
2542 /* Output a marker (i.e. a label) for the beginning of a function, before
2546 dwarf2out_begin_prologue (unsigned int line ATTRIBUTE_UNUSED
,
2547 const char *file ATTRIBUTE_UNUSED
)
2549 char label
[MAX_ARTIFICIAL_LABEL_BYTES
];
2553 current_function_func_begin_label
= NULL
;
2555 #ifdef TARGET_UNWIND_INFO
2556 /* ??? current_function_func_begin_label is also used by except.c
2557 for call-site information. We must emit this label if it might
2559 if ((! flag_exceptions
|| USING_SJLJ_EXCEPTIONS
)
2560 && ! dwarf2out_do_frame ())
2563 if (! dwarf2out_do_frame ())
2567 switch_to_section (function_section (current_function_decl
));
2568 ASM_GENERATE_INTERNAL_LABEL (label
, FUNC_BEGIN_LABEL
,
2569 current_function_funcdef_no
);
2570 ASM_OUTPUT_DEBUG_LABEL (asm_out_file
, FUNC_BEGIN_LABEL
,
2571 current_function_funcdef_no
);
2572 dup_label
= xstrdup (label
);
2573 current_function_func_begin_label
= dup_label
;
2575 #ifdef TARGET_UNWIND_INFO
2576 /* We can elide the fde allocation if we're not emitting debug info. */
2577 if (! dwarf2out_do_frame ())
2581 /* Expand the fde table if necessary. */
2582 if (fde_table_in_use
== fde_table_allocated
)
2584 fde_table_allocated
+= FDE_TABLE_INCREMENT
;
2585 fde_table
= ggc_realloc (fde_table
,
2586 fde_table_allocated
* sizeof (dw_fde_node
));
2587 memset (fde_table
+ fde_table_in_use
, 0,
2588 FDE_TABLE_INCREMENT
* sizeof (dw_fde_node
));
2591 /* Record the FDE associated with this function. */
2592 current_funcdef_fde
= fde_table_in_use
;
2594 /* Add the new FDE at the end of the fde_table. */
2595 fde
= &fde_table
[fde_table_in_use
++];
2596 fde
->decl
= current_function_decl
;
2597 fde
->dw_fde_begin
= dup_label
;
2598 fde
->dw_fde_current_label
= dup_label
;
2599 fde
->dw_fde_hot_section_label
= NULL
;
2600 fde
->dw_fde_hot_section_end_label
= NULL
;
2601 fde
->dw_fde_unlikely_section_label
= NULL
;
2602 fde
->dw_fde_unlikely_section_end_label
= NULL
;
2603 fde
->dw_fde_switched_sections
= false;
2604 fde
->dw_fde_end
= NULL
;
2605 fde
->dw_fde_cfi
= NULL
;
2606 fde
->funcdef_number
= current_function_funcdef_no
;
2607 fde
->nothrow
= TREE_NOTHROW (current_function_decl
);
2608 fde
->uses_eh_lsda
= cfun
->uses_eh_lsda
;
2609 fde
->all_throwers_are_sibcalls
= cfun
->all_throwers_are_sibcalls
;
2611 args_size
= old_args_size
= 0;
2613 /* We only want to output line number information for the genuine dwarf2
2614 prologue case, not the eh frame case. */
2615 #ifdef DWARF2_DEBUGGING_INFO
2617 dwarf2out_source_line (line
, file
);
2621 /* Output a marker (i.e. a label) for the absolute end of the generated code
2622 for a function definition. This gets called *after* the epilogue code has
2626 dwarf2out_end_epilogue (unsigned int line ATTRIBUTE_UNUSED
,
2627 const char *file ATTRIBUTE_UNUSED
)
2630 char label
[MAX_ARTIFICIAL_LABEL_BYTES
];
2632 /* Output a label to mark the endpoint of the code generated for this
2634 ASM_GENERATE_INTERNAL_LABEL (label
, FUNC_END_LABEL
,
2635 current_function_funcdef_no
);
2636 ASM_OUTPUT_LABEL (asm_out_file
, label
);
2637 fde
= &fde_table
[fde_table_in_use
- 1];
2638 fde
->dw_fde_end
= xstrdup (label
);
2642 dwarf2out_frame_init (void)
2644 /* Allocate the initial hunk of the fde_table. */
2645 fde_table
= ggc_alloc_cleared (FDE_TABLE_INCREMENT
* sizeof (dw_fde_node
));
2646 fde_table_allocated
= FDE_TABLE_INCREMENT
;
2647 fde_table_in_use
= 0;
2649 /* Generate the CFA instructions common to all FDE's. Do it now for the
2650 sake of lookup_cfa. */
2652 /* On entry, the Canonical Frame Address is at SP. */
2653 dwarf2out_def_cfa (NULL
, STACK_POINTER_REGNUM
, INCOMING_FRAME_SP_OFFSET
);
2655 #ifdef DWARF2_UNWIND_INFO
2656 if (DWARF2_UNWIND_INFO
)
2657 initial_return_save (INCOMING_RETURN_ADDR_RTX
);
2662 dwarf2out_frame_finish (void)
2664 /* Output call frame information. */
2665 if (DWARF2_FRAME_INFO
)
2666 output_call_frame_info (0);
2668 #ifndef TARGET_UNWIND_INFO
2669 /* Output another copy for the unwinder. */
2670 if (! USING_SJLJ_EXCEPTIONS
&& (flag_unwind_tables
|| flag_exceptions
))
2671 output_call_frame_info (1);
2676 /* And now, the subset of the debugging information support code necessary
2677 for emitting location expressions. */
2679 /* Data about a single source file. */
2680 struct dwarf_file_data
GTY(())
2682 const char * filename
;
2686 /* We need some way to distinguish DW_OP_addr with a direct symbol
2687 relocation from DW_OP_addr with a dtp-relative symbol relocation. */
2688 #define INTERNAL_DW_OP_tls_addr (0x100 + DW_OP_addr)
2691 typedef struct dw_val_struct
*dw_val_ref
;
2692 typedef struct die_struct
*dw_die_ref
;
2693 typedef struct dw_loc_descr_struct
*dw_loc_descr_ref
;
2694 typedef struct dw_loc_list_struct
*dw_loc_list_ref
;
2696 /* Each DIE may have a series of attribute/value pairs. Values
2697 can take on several forms. The forms that are used in this
2698 implementation are listed below. */
2703 dw_val_class_offset
,
2705 dw_val_class_loc_list
,
2706 dw_val_class_range_list
,
2708 dw_val_class_unsigned_const
,
2709 dw_val_class_long_long
,
2712 dw_val_class_die_ref
,
2713 dw_val_class_fde_ref
,
2714 dw_val_class_lbl_id
,
2715 dw_val_class_lineptr
,
2717 dw_val_class_macptr
,
2721 /* Describe a double word constant value. */
2722 /* ??? Every instance of long_long in the code really means CONST_DOUBLE. */
2724 typedef struct dw_long_long_struct
GTY(())
2731 /* Describe a floating point constant value, or a vector constant value. */
2733 typedef struct dw_vec_struct
GTY(())
2735 unsigned char * GTY((length ("%h.length"))) array
;
2741 /* The dw_val_node describes an attribute's value, as it is
2742 represented internally. */
2744 typedef struct dw_val_struct
GTY(())
2746 enum dw_val_class val_class
;
2747 union dw_val_struct_union
2749 rtx
GTY ((tag ("dw_val_class_addr"))) val_addr
;
2750 unsigned HOST_WIDE_INT
GTY ((tag ("dw_val_class_offset"))) val_offset
;
2751 dw_loc_list_ref
GTY ((tag ("dw_val_class_loc_list"))) val_loc_list
;
2752 dw_loc_descr_ref
GTY ((tag ("dw_val_class_loc"))) val_loc
;
2753 HOST_WIDE_INT
GTY ((default)) val_int
;
2754 unsigned HOST_WIDE_INT
GTY ((tag ("dw_val_class_unsigned_const"))) val_unsigned
;
2755 dw_long_long_const
GTY ((tag ("dw_val_class_long_long"))) val_long_long
;
2756 dw_vec_const
GTY ((tag ("dw_val_class_vec"))) val_vec
;
2757 struct dw_val_die_union
2761 } GTY ((tag ("dw_val_class_die_ref"))) val_die_ref
;
2762 unsigned GTY ((tag ("dw_val_class_fde_ref"))) val_fde_index
;
2763 struct indirect_string_node
* GTY ((tag ("dw_val_class_str"))) val_str
;
2764 char * GTY ((tag ("dw_val_class_lbl_id"))) val_lbl_id
;
2765 unsigned char GTY ((tag ("dw_val_class_flag"))) val_flag
;
2766 struct dwarf_file_data
* GTY ((tag ("dw_val_class_file"))) val_file
;
2768 GTY ((desc ("%1.val_class"))) v
;
2772 /* Locations in memory are described using a sequence of stack machine
2775 typedef struct dw_loc_descr_struct
GTY(())
2777 dw_loc_descr_ref dw_loc_next
;
2778 enum dwarf_location_atom dw_loc_opc
;
2779 dw_val_node dw_loc_oprnd1
;
2780 dw_val_node dw_loc_oprnd2
;
2785 /* Location lists are ranges + location descriptions for that range,
2786 so you can track variables that are in different places over
2787 their entire life. */
2788 typedef struct dw_loc_list_struct
GTY(())
2790 dw_loc_list_ref dw_loc_next
;
2791 const char *begin
; /* Label for begin address of range */
2792 const char *end
; /* Label for end address of range */
2793 char *ll_symbol
; /* Label for beginning of location list.
2794 Only on head of list */
2795 const char *section
; /* Section this loclist is relative to */
2796 dw_loc_descr_ref expr
;
2799 #if defined (DWARF2_DEBUGGING_INFO) || defined (DWARF2_UNWIND_INFO)
2801 static const char *dwarf_stack_op_name (unsigned);
2802 static dw_loc_descr_ref
new_loc_descr (enum dwarf_location_atom
,
2803 unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
);
2804 static void add_loc_descr (dw_loc_descr_ref
*, dw_loc_descr_ref
);
2805 static unsigned long size_of_loc_descr (dw_loc_descr_ref
);
2806 static unsigned long size_of_locs (dw_loc_descr_ref
);
2807 static void output_loc_operands (dw_loc_descr_ref
);
2808 static void output_loc_sequence (dw_loc_descr_ref
);
2810 /* Convert a DWARF stack opcode into its string name. */
2813 dwarf_stack_op_name (unsigned int op
)
2818 case INTERNAL_DW_OP_tls_addr
:
2819 return "DW_OP_addr";
2821 return "DW_OP_deref";
2823 return "DW_OP_const1u";
2825 return "DW_OP_const1s";
2827 return "DW_OP_const2u";
2829 return "DW_OP_const2s";
2831 return "DW_OP_const4u";
2833 return "DW_OP_const4s";
2835 return "DW_OP_const8u";
2837 return "DW_OP_const8s";
2839 return "DW_OP_constu";
2841 return "DW_OP_consts";
2845 return "DW_OP_drop";
2847 return "DW_OP_over";
2849 return "DW_OP_pick";
2851 return "DW_OP_swap";
2855 return "DW_OP_xderef";
2863 return "DW_OP_minus";
2875 return "DW_OP_plus";
2876 case DW_OP_plus_uconst
:
2877 return "DW_OP_plus_uconst";
2883 return "DW_OP_shra";
2901 return "DW_OP_skip";
2903 return "DW_OP_lit0";
2905 return "DW_OP_lit1";
2907 return "DW_OP_lit2";
2909 return "DW_OP_lit3";
2911 return "DW_OP_lit4";
2913 return "DW_OP_lit5";
2915 return "DW_OP_lit6";
2917 return "DW_OP_lit7";
2919 return "DW_OP_lit8";
2921 return "DW_OP_lit9";
2923 return "DW_OP_lit10";
2925 return "DW_OP_lit11";
2927 return "DW_OP_lit12";
2929 return "DW_OP_lit13";
2931 return "DW_OP_lit14";
2933 return "DW_OP_lit15";
2935 return "DW_OP_lit16";
2937 return "DW_OP_lit17";
2939 return "DW_OP_lit18";
2941 return "DW_OP_lit19";
2943 return "DW_OP_lit20";
2945 return "DW_OP_lit21";
2947 return "DW_OP_lit22";
2949 return "DW_OP_lit23";
2951 return "DW_OP_lit24";
2953 return "DW_OP_lit25";
2955 return "DW_OP_lit26";
2957 return "DW_OP_lit27";
2959 return "DW_OP_lit28";
2961 return "DW_OP_lit29";
2963 return "DW_OP_lit30";
2965 return "DW_OP_lit31";
2967 return "DW_OP_reg0";
2969 return "DW_OP_reg1";
2971 return "DW_OP_reg2";
2973 return "DW_OP_reg3";
2975 return "DW_OP_reg4";
2977 return "DW_OP_reg5";
2979 return "DW_OP_reg6";
2981 return "DW_OP_reg7";
2983 return "DW_OP_reg8";
2985 return "DW_OP_reg9";
2987 return "DW_OP_reg10";
2989 return "DW_OP_reg11";
2991 return "DW_OP_reg12";
2993 return "DW_OP_reg13";
2995 return "DW_OP_reg14";
2997 return "DW_OP_reg15";
2999 return "DW_OP_reg16";
3001 return "DW_OP_reg17";
3003 return "DW_OP_reg18";
3005 return "DW_OP_reg19";
3007 return "DW_OP_reg20";
3009 return "DW_OP_reg21";
3011 return "DW_OP_reg22";
3013 return "DW_OP_reg23";
3015 return "DW_OP_reg24";
3017 return "DW_OP_reg25";
3019 return "DW_OP_reg26";
3021 return "DW_OP_reg27";
3023 return "DW_OP_reg28";
3025 return "DW_OP_reg29";
3027 return "DW_OP_reg30";
3029 return "DW_OP_reg31";
3031 return "DW_OP_breg0";
3033 return "DW_OP_breg1";
3035 return "DW_OP_breg2";
3037 return "DW_OP_breg3";
3039 return "DW_OP_breg4";
3041 return "DW_OP_breg5";
3043 return "DW_OP_breg6";
3045 return "DW_OP_breg7";
3047 return "DW_OP_breg8";
3049 return "DW_OP_breg9";
3051 return "DW_OP_breg10";
3053 return "DW_OP_breg11";
3055 return "DW_OP_breg12";
3057 return "DW_OP_breg13";
3059 return "DW_OP_breg14";
3061 return "DW_OP_breg15";
3063 return "DW_OP_breg16";
3065 return "DW_OP_breg17";
3067 return "DW_OP_breg18";
3069 return "DW_OP_breg19";
3071 return "DW_OP_breg20";
3073 return "DW_OP_breg21";
3075 return "DW_OP_breg22";
3077 return "DW_OP_breg23";
3079 return "DW_OP_breg24";
3081 return "DW_OP_breg25";
3083 return "DW_OP_breg26";
3085 return "DW_OP_breg27";
3087 return "DW_OP_breg28";
3089 return "DW_OP_breg29";
3091 return "DW_OP_breg30";
3093 return "DW_OP_breg31";
3095 return "DW_OP_regx";
3097 return "DW_OP_fbreg";
3099 return "DW_OP_bregx";
3101 return "DW_OP_piece";
3102 case DW_OP_deref_size
:
3103 return "DW_OP_deref_size";
3104 case DW_OP_xderef_size
:
3105 return "DW_OP_xderef_size";
3108 case DW_OP_push_object_address
:
3109 return "DW_OP_push_object_address";
3111 return "DW_OP_call2";
3113 return "DW_OP_call4";
3114 case DW_OP_call_ref
:
3115 return "DW_OP_call_ref";
3116 case DW_OP_GNU_push_tls_address
:
3117 return "DW_OP_GNU_push_tls_address";
3119 return "OP_<unknown>";
3123 /* Return a pointer to a newly allocated location description. Location
3124 descriptions are simple expression terms that can be strung
3125 together to form more complicated location (address) descriptions. */
3127 static inline dw_loc_descr_ref
3128 new_loc_descr (enum dwarf_location_atom op
, unsigned HOST_WIDE_INT oprnd1
,
3129 unsigned HOST_WIDE_INT oprnd2
)
3131 dw_loc_descr_ref descr
= ggc_alloc_cleared (sizeof (dw_loc_descr_node
));
3133 descr
->dw_loc_opc
= op
;
3134 descr
->dw_loc_oprnd1
.val_class
= dw_val_class_unsigned_const
;
3135 descr
->dw_loc_oprnd1
.v
.val_unsigned
= oprnd1
;
3136 descr
->dw_loc_oprnd2
.val_class
= dw_val_class_unsigned_const
;
3137 descr
->dw_loc_oprnd2
.v
.val_unsigned
= oprnd2
;
3142 /* Add a location description term to a location description expression. */
3145 add_loc_descr (dw_loc_descr_ref
*list_head
, dw_loc_descr_ref descr
)
3147 dw_loc_descr_ref
*d
;
3149 /* Find the end of the chain. */
3150 for (d
= list_head
; (*d
) != NULL
; d
= &(*d
)->dw_loc_next
)
3156 /* Return the size of a location descriptor. */
3158 static unsigned long
3159 size_of_loc_descr (dw_loc_descr_ref loc
)
3161 unsigned long size
= 1;
3163 switch (loc
->dw_loc_opc
)
3166 case INTERNAL_DW_OP_tls_addr
:
3167 size
+= DWARF2_ADDR_SIZE
;
3186 size
+= size_of_uleb128 (loc
->dw_loc_oprnd1
.v
.val_unsigned
);
3189 size
+= size_of_sleb128 (loc
->dw_loc_oprnd1
.v
.val_int
);
3194 case DW_OP_plus_uconst
:
3195 size
+= size_of_uleb128 (loc
->dw_loc_oprnd1
.v
.val_unsigned
);
3233 size
+= size_of_sleb128 (loc
->dw_loc_oprnd1
.v
.val_int
);
3236 size
+= size_of_uleb128 (loc
->dw_loc_oprnd1
.v
.val_unsigned
);
3239 size
+= size_of_sleb128 (loc
->dw_loc_oprnd1
.v
.val_int
);
3242 size
+= size_of_uleb128 (loc
->dw_loc_oprnd1
.v
.val_unsigned
);
3243 size
+= size_of_sleb128 (loc
->dw_loc_oprnd2
.v
.val_int
);
3246 size
+= size_of_uleb128 (loc
->dw_loc_oprnd1
.v
.val_unsigned
);
3248 case DW_OP_deref_size
:
3249 case DW_OP_xderef_size
:
3258 case DW_OP_call_ref
:
3259 size
+= DWARF2_ADDR_SIZE
;
3268 /* Return the size of a series of location descriptors. */
3270 static unsigned long
3271 size_of_locs (dw_loc_descr_ref loc
)
3276 /* If there are no skip or bra opcodes, don't fill in the dw_loc_addr
3277 field, to avoid writing to a PCH file. */
3278 for (size
= 0, l
= loc
; l
!= NULL
; l
= l
->dw_loc_next
)
3280 if (l
->dw_loc_opc
== DW_OP_skip
|| l
->dw_loc_opc
== DW_OP_bra
)
3282 size
+= size_of_loc_descr (l
);
3287 for (size
= 0, l
= loc
; l
!= NULL
; l
= l
->dw_loc_next
)
3289 l
->dw_loc_addr
= size
;
3290 size
+= size_of_loc_descr (l
);
3296 /* Output location description stack opcode's operands (if any). */
3299 output_loc_operands (dw_loc_descr_ref loc
)
3301 dw_val_ref val1
= &loc
->dw_loc_oprnd1
;
3302 dw_val_ref val2
= &loc
->dw_loc_oprnd2
;
3304 switch (loc
->dw_loc_opc
)
3306 #ifdef DWARF2_DEBUGGING_INFO
3308 dw2_asm_output_addr_rtx (DWARF2_ADDR_SIZE
, val1
->v
.val_addr
, NULL
);
3312 dw2_asm_output_data (2, val1
->v
.val_int
, NULL
);
3316 dw2_asm_output_data (4, val1
->v
.val_int
, NULL
);
3320 gcc_assert (HOST_BITS_PER_LONG
>= 64);
3321 dw2_asm_output_data (8, val1
->v
.val_int
, NULL
);
3328 gcc_assert (val1
->val_class
== dw_val_class_loc
);
3329 offset
= val1
->v
.val_loc
->dw_loc_addr
- (loc
->dw_loc_addr
+ 3);
3331 dw2_asm_output_data (2, offset
, NULL
);
3344 /* We currently don't make any attempt to make sure these are
3345 aligned properly like we do for the main unwind info, so
3346 don't support emitting things larger than a byte if we're
3347 only doing unwinding. */
3352 dw2_asm_output_data (1, val1
->v
.val_int
, NULL
);
3355 dw2_asm_output_data_uleb128 (val1
->v
.val_unsigned
, NULL
);
3358 dw2_asm_output_data_sleb128 (val1
->v
.val_int
, NULL
);
3361 dw2_asm_output_data (1, val1
->v
.val_int
, NULL
);
3363 case DW_OP_plus_uconst
:
3364 dw2_asm_output_data_uleb128 (val1
->v
.val_unsigned
, NULL
);
3398 dw2_asm_output_data_sleb128 (val1
->v
.val_int
, NULL
);
3401 dw2_asm_output_data_uleb128 (val1
->v
.val_unsigned
, NULL
);
3404 dw2_asm_output_data_sleb128 (val1
->v
.val_int
, NULL
);
3407 dw2_asm_output_data_uleb128 (val1
->v
.val_unsigned
, NULL
);
3408 dw2_asm_output_data_sleb128 (val2
->v
.val_int
, NULL
);
3411 dw2_asm_output_data_uleb128 (val1
->v
.val_unsigned
, NULL
);
3413 case DW_OP_deref_size
:
3414 case DW_OP_xderef_size
:
3415 dw2_asm_output_data (1, val1
->v
.val_int
, NULL
);
3418 case INTERNAL_DW_OP_tls_addr
:
3419 if (targetm
.asm_out
.output_dwarf_dtprel
)
3421 targetm
.asm_out
.output_dwarf_dtprel (asm_out_file
,
3424 fputc ('\n', asm_out_file
);
3431 /* Other codes have no operands. */
3436 /* Output a sequence of location operations. */
3439 output_loc_sequence (dw_loc_descr_ref loc
)
3441 for (; loc
!= NULL
; loc
= loc
->dw_loc_next
)
3443 /* Output the opcode. */
3444 dw2_asm_output_data (1, loc
->dw_loc_opc
,
3445 "%s", dwarf_stack_op_name (loc
->dw_loc_opc
));
3447 /* Output the operand(s) (if any). */
3448 output_loc_operands (loc
);
3452 /* This routine will generate the correct assembly data for a location
3453 description based on a cfi entry with a complex address. */
3456 output_cfa_loc (dw_cfi_ref cfi
)
3458 dw_loc_descr_ref loc
;
3461 /* Output the size of the block. */
3462 loc
= cfi
->dw_cfi_oprnd1
.dw_cfi_loc
;
3463 size
= size_of_locs (loc
);
3464 dw2_asm_output_data_uleb128 (size
, NULL
);
3466 /* Now output the operations themselves. */
3467 output_loc_sequence (loc
);
3470 /* This function builds a dwarf location descriptor sequence from a
3471 dw_cfa_location, adding the given OFFSET to the result of the
3474 static struct dw_loc_descr_struct
*
3475 build_cfa_loc (dw_cfa_location
*cfa
, HOST_WIDE_INT offset
)
3477 struct dw_loc_descr_struct
*head
, *tmp
;
3479 offset
+= cfa
->offset
;
3483 if (cfa
->base_offset
)
3486 head
= new_loc_descr (DW_OP_breg0
+ cfa
->reg
, cfa
->base_offset
, 0);
3488 head
= new_loc_descr (DW_OP_bregx
, cfa
->reg
, cfa
->base_offset
);
3490 else if (cfa
->reg
<= 31)
3491 head
= new_loc_descr (DW_OP_reg0
+ cfa
->reg
, 0, 0);
3493 head
= new_loc_descr (DW_OP_regx
, cfa
->reg
, 0);
3495 head
->dw_loc_oprnd1
.val_class
= dw_val_class_const
;
3496 tmp
= new_loc_descr (DW_OP_deref
, 0, 0);
3497 add_loc_descr (&head
, tmp
);
3500 tmp
= new_loc_descr (DW_OP_plus_uconst
, offset
, 0);
3501 add_loc_descr (&head
, tmp
);
3508 head
= new_loc_descr (DW_OP_reg0
+ cfa
->reg
, 0, 0);
3510 head
= new_loc_descr (DW_OP_regx
, cfa
->reg
, 0);
3511 else if (cfa
->reg
<= 31)
3512 head
= new_loc_descr (DW_OP_breg0
+ cfa
->reg
, offset
, 0);
3514 head
= new_loc_descr (DW_OP_bregx
, cfa
->reg
, offset
);
3520 /* This function fills in aa dw_cfa_location structure from a dwarf location
3521 descriptor sequence. */
3524 get_cfa_from_loc_descr (dw_cfa_location
*cfa
, struct dw_loc_descr_struct
*loc
)
3526 struct dw_loc_descr_struct
*ptr
;
3528 cfa
->base_offset
= 0;
3532 for (ptr
= loc
; ptr
!= NULL
; ptr
= ptr
->dw_loc_next
)
3534 enum dwarf_location_atom op
= ptr
->dw_loc_opc
;
3570 cfa
->reg
= op
- DW_OP_reg0
;
3573 cfa
->reg
= ptr
->dw_loc_oprnd1
.v
.val_int
;
3607 cfa
->reg
= op
- DW_OP_breg0
;
3608 cfa
->base_offset
= ptr
->dw_loc_oprnd1
.v
.val_int
;
3611 cfa
->reg
= ptr
->dw_loc_oprnd1
.v
.val_int
;
3612 cfa
->base_offset
= ptr
->dw_loc_oprnd2
.v
.val_int
;
3617 case DW_OP_plus_uconst
:
3618 cfa
->offset
= ptr
->dw_loc_oprnd1
.v
.val_unsigned
;
3621 internal_error ("DW_LOC_OP %s not implemented",
3622 dwarf_stack_op_name (ptr
->dw_loc_opc
));
3626 #endif /* .debug_frame support */
3628 /* And now, the support for symbolic debugging information. */
3629 #ifdef DWARF2_DEBUGGING_INFO
3631 /* .debug_str support. */
3632 static int output_indirect_string (void **, void *);
3634 static void dwarf2out_init (const char *);
3635 static void dwarf2out_finish (const char *);
3636 static void dwarf2out_define (unsigned int, const char *);
3637 static void dwarf2out_undef (unsigned int, const char *);
3638 static void dwarf2out_start_source_file (unsigned, const char *);
3639 static void dwarf2out_end_source_file (unsigned);
3640 static void dwarf2out_begin_block (unsigned, unsigned);
3641 static void dwarf2out_end_block (unsigned, unsigned);
3642 static bool dwarf2out_ignore_block (tree
);
3643 static void dwarf2out_global_decl (tree
);
3644 static void dwarf2out_type_decl (tree
, int);
3645 static void dwarf2out_imported_module_or_decl (tree
, tree
);
3646 static void dwarf2out_abstract_function (tree
);
3647 static void dwarf2out_var_location (rtx
);
3648 static void dwarf2out_begin_function (tree
);
3649 static void dwarf2out_switch_text_section (void);
3651 /* The debug hooks structure. */
3653 const struct gcc_debug_hooks dwarf2_debug_hooks
=
3659 dwarf2out_start_source_file
,
3660 dwarf2out_end_source_file
,
3661 dwarf2out_begin_block
,
3662 dwarf2out_end_block
,
3663 dwarf2out_ignore_block
,
3664 dwarf2out_source_line
,
3665 dwarf2out_begin_prologue
,
3666 debug_nothing_int_charstar
, /* end_prologue */
3667 dwarf2out_end_epilogue
,
3668 dwarf2out_begin_function
,
3669 debug_nothing_int
, /* end_function */
3670 dwarf2out_decl
, /* function_decl */
3671 dwarf2out_global_decl
,
3672 dwarf2out_type_decl
, /* type_decl */
3673 dwarf2out_imported_module_or_decl
,
3674 debug_nothing_tree
, /* deferred_inline_function */
3675 /* The DWARF 2 backend tries to reduce debugging bloat by not
3676 emitting the abstract description of inline functions until
3677 something tries to reference them. */
3678 dwarf2out_abstract_function
, /* outlining_inline_function */
3679 debug_nothing_rtx
, /* label */
3680 debug_nothing_int
, /* handle_pch */
3681 dwarf2out_var_location
,
3682 dwarf2out_switch_text_section
,
3683 1 /* start_end_main_source_file */
3687 /* NOTE: In the comments in this file, many references are made to
3688 "Debugging Information Entries". This term is abbreviated as `DIE'
3689 throughout the remainder of this file. */
3691 /* An internal representation of the DWARF output is built, and then
3692 walked to generate the DWARF debugging info. The walk of the internal
3693 representation is done after the entire program has been compiled.
3694 The types below are used to describe the internal representation. */
3696 /* Various DIE's use offsets relative to the beginning of the
3697 .debug_info section to refer to each other. */
3699 typedef long int dw_offset
;
3701 /* Define typedefs here to avoid circular dependencies. */
3703 typedef struct dw_attr_struct
*dw_attr_ref
;
3704 typedef struct dw_line_info_struct
*dw_line_info_ref
;
3705 typedef struct dw_separate_line_info_struct
*dw_separate_line_info_ref
;
3706 typedef struct pubname_struct
*pubname_ref
;
3707 typedef struct dw_ranges_struct
*dw_ranges_ref
;
3709 /* Each entry in the line_info_table maintains the file and
3710 line number associated with the label generated for that
3711 entry. The label gives the PC value associated with
3712 the line number entry. */
3714 typedef struct dw_line_info_struct
GTY(())
3716 unsigned long dw_file_num
;
3717 unsigned long dw_line_num
;
3721 /* Line information for functions in separate sections; each one gets its
3723 typedef struct dw_separate_line_info_struct
GTY(())
3725 unsigned long dw_file_num
;
3726 unsigned long dw_line_num
;
3727 unsigned long function
;
3729 dw_separate_line_info_entry
;
3731 /* Each DIE attribute has a field specifying the attribute kind,
3732 a link to the next attribute in the chain, and an attribute value.
3733 Attributes are typically linked below the DIE they modify. */
3735 typedef struct dw_attr_struct
GTY(())
3737 enum dwarf_attribute dw_attr
;
3738 dw_val_node dw_attr_val
;
3742 DEF_VEC_O(dw_attr_node
);
3743 DEF_VEC_ALLOC_O(dw_attr_node
,gc
);
3745 /* The Debugging Information Entry (DIE) structure. DIEs form a tree.
3746 The children of each node form a circular list linked by
3747 die_sib. die_child points to the node *before* the "first" child node. */
3749 typedef struct die_struct
GTY(())
3751 enum dwarf_tag die_tag
;
3753 VEC(dw_attr_node
,gc
) * die_attr
;
3754 dw_die_ref die_parent
;
3755 dw_die_ref die_child
;
3757 dw_die_ref die_definition
; /* ref from a specification to its definition */
3758 dw_offset die_offset
;
3759 unsigned long die_abbrev
;
3761 /* Die is used and must not be pruned as unused. */
3762 int die_perennial_p
;
3763 unsigned int decl_id
;
3767 /* Evaluate 'expr' while 'c' is set to each child of DIE in order. */
3768 #define FOR_EACH_CHILD(die, c, expr) do { \
3769 c = die->die_child; \
3773 } while (c != die->die_child); \
3776 /* The pubname structure */
3778 typedef struct pubname_struct
GTY(())
3785 DEF_VEC_O(pubname_entry
);
3786 DEF_VEC_ALLOC_O(pubname_entry
, gc
);
3788 struct dw_ranges_struct
GTY(())
3793 /* The limbo die list structure. */
3794 typedef struct limbo_die_struct
GTY(())
3798 struct limbo_die_struct
*next
;
3802 /* How to start an assembler comment. */
3803 #ifndef ASM_COMMENT_START
3804 #define ASM_COMMENT_START ";#"
3807 /* Define a macro which returns nonzero for a TYPE_DECL which was
3808 implicitly generated for a tagged type.
3810 Note that unlike the gcc front end (which generates a NULL named
3811 TYPE_DECL node for each complete tagged type, each array type, and
3812 each function type node created) the g++ front end generates a
3813 _named_ TYPE_DECL node for each tagged type node created.
3814 These TYPE_DECLs have DECL_ARTIFICIAL set, so we know not to
3815 generate a DW_TAG_typedef DIE for them. */
3817 #define TYPE_DECL_IS_STUB(decl) \
3818 (DECL_NAME (decl) == NULL_TREE \
3819 || (DECL_ARTIFICIAL (decl) \
3820 && is_tagged_type (TREE_TYPE (decl)) \
3821 && ((decl == TYPE_STUB_DECL (TREE_TYPE (decl))) \
3822 /* This is necessary for stub decls that \
3823 appear in nested inline functions. */ \
3824 || (DECL_ABSTRACT_ORIGIN (decl) != NULL_TREE \
3825 && (decl_ultimate_origin (decl) \
3826 == TYPE_STUB_DECL (TREE_TYPE (decl)))))))
3828 /* Information concerning the compilation unit's programming
3829 language, and compiler version. */
3831 /* Fixed size portion of the DWARF compilation unit header. */
3832 #define DWARF_COMPILE_UNIT_HEADER_SIZE \
3833 (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 3)
3835 /* Fixed size portion of public names info. */
3836 #define DWARF_PUBNAMES_HEADER_SIZE (2 * DWARF_OFFSET_SIZE + 2)
3838 /* Fixed size portion of the address range info. */
3839 #define DWARF_ARANGES_HEADER_SIZE \
3840 (DWARF_ROUND (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 4, \
3841 DWARF2_ADDR_SIZE * 2) \
3842 - DWARF_INITIAL_LENGTH_SIZE)
3844 /* Size of padding portion in the address range info. It must be
3845 aligned to twice the pointer size. */
3846 #define DWARF_ARANGES_PAD_SIZE \
3847 (DWARF_ROUND (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 4, \
3848 DWARF2_ADDR_SIZE * 2) \
3849 - (DWARF_INITIAL_LENGTH_SIZE + DWARF_OFFSET_SIZE + 4))
3851 /* Use assembler line directives if available. */
3852 #ifndef DWARF2_ASM_LINE_DEBUG_INFO
3853 #ifdef HAVE_AS_DWARF2_DEBUG_LINE
3854 #define DWARF2_ASM_LINE_DEBUG_INFO 1
3856 #define DWARF2_ASM_LINE_DEBUG_INFO 0
3860 /* Minimum line offset in a special line info. opcode.
3861 This value was chosen to give a reasonable range of values. */
3862 #define DWARF_LINE_BASE -10
3864 /* First special line opcode - leave room for the standard opcodes. */
3865 #define DWARF_LINE_OPCODE_BASE 10
3867 /* Range of line offsets in a special line info. opcode. */
3868 #define DWARF_LINE_RANGE (254-DWARF_LINE_OPCODE_BASE+1)
3870 /* Flag that indicates the initial value of the is_stmt_start flag.
3871 In the present implementation, we do not mark any lines as
3872 the beginning of a source statement, because that information
3873 is not made available by the GCC front-end. */
3874 #define DWARF_LINE_DEFAULT_IS_STMT_START 1
3876 #ifdef DWARF2_DEBUGGING_INFO
3877 /* This location is used by calc_die_sizes() to keep track
3878 the offset of each DIE within the .debug_info section. */
3879 static unsigned long next_die_offset
;
3882 /* Record the root of the DIE's built for the current compilation unit. */
3883 static GTY(()) dw_die_ref comp_unit_die
;
3885 /* A list of DIEs with a NULL parent waiting to be relocated. */
3886 static GTY(()) limbo_die_node
*limbo_die_list
;
3888 /* Filenames referenced by this compilation unit. */
3889 static GTY((param_is (struct dwarf_file_data
))) htab_t file_table
;
3891 /* A hash table of references to DIE's that describe declarations.
3892 The key is a DECL_UID() which is a unique number identifying each decl. */
3893 static GTY ((param_is (struct die_struct
))) htab_t decl_die_table
;
3895 /* Node of the variable location list. */
3896 struct var_loc_node
GTY ((chain_next ("%h.next")))
3898 rtx
GTY (()) var_loc_note
;
3899 const char * GTY (()) label
;
3900 const char * GTY (()) section_label
;
3901 struct var_loc_node
* GTY (()) next
;
3904 /* Variable location list. */
3905 struct var_loc_list_def
GTY (())
3907 struct var_loc_node
* GTY (()) first
;
3909 /* Do not mark the last element of the chained list because
3910 it is marked through the chain. */
3911 struct var_loc_node
* GTY ((skip ("%h"))) last
;
3913 /* DECL_UID of the variable decl. */
3914 unsigned int decl_id
;
3916 typedef struct var_loc_list_def var_loc_list
;
3919 /* Table of decl location linked lists. */
3920 static GTY ((param_is (var_loc_list
))) htab_t decl_loc_table
;
3922 /* A pointer to the base of a list of references to DIE's that
3923 are uniquely identified by their tag, presence/absence of
3924 children DIE's, and list of attribute/value pairs. */
3925 static GTY((length ("abbrev_die_table_allocated")))
3926 dw_die_ref
*abbrev_die_table
;
3928 /* Number of elements currently allocated for abbrev_die_table. */
3929 static GTY(()) unsigned abbrev_die_table_allocated
;
3931 /* Number of elements in type_die_table currently in use. */
3932 static GTY(()) unsigned abbrev_die_table_in_use
;
3934 /* Size (in elements) of increments by which we may expand the
3935 abbrev_die_table. */
3936 #define ABBREV_DIE_TABLE_INCREMENT 256
3938 /* A pointer to the base of a table that contains line information
3939 for each source code line in .text in the compilation unit. */
3940 static GTY((length ("line_info_table_allocated")))
3941 dw_line_info_ref line_info_table
;
3943 /* Number of elements currently allocated for line_info_table. */
3944 static GTY(()) unsigned line_info_table_allocated
;
3946 /* Number of elements in line_info_table currently in use. */
3947 static GTY(()) unsigned line_info_table_in_use
;
3949 /* True if the compilation unit places functions in more than one section. */
3950 static GTY(()) bool have_multiple_function_sections
= false;
3952 /* A pointer to the base of a table that contains line information
3953 for each source code line outside of .text in the compilation unit. */
3954 static GTY ((length ("separate_line_info_table_allocated")))
3955 dw_separate_line_info_ref separate_line_info_table
;
3957 /* Number of elements currently allocated for separate_line_info_table. */
3958 static GTY(()) unsigned separate_line_info_table_allocated
;
3960 /* Number of elements in separate_line_info_table currently in use. */
3961 static GTY(()) unsigned separate_line_info_table_in_use
;
3963 /* Size (in elements) of increments by which we may expand the
3965 #define LINE_INFO_TABLE_INCREMENT 1024
3967 /* A pointer to the base of a table that contains a list of publicly
3968 accessible names. */
3969 static GTY (()) VEC (pubname_entry
, gc
) * pubname_table
;
3971 /* A pointer to the base of a table that contains a list of publicly
3972 accessible types. */
3973 static GTY (()) VEC (pubname_entry
, gc
) * pubtype_table
;
3975 /* Array of dies for which we should generate .debug_arange info. */
3976 static GTY((length ("arange_table_allocated"))) dw_die_ref
*arange_table
;
3978 /* Number of elements currently allocated for arange_table. */
3979 static GTY(()) unsigned arange_table_allocated
;
3981 /* Number of elements in arange_table currently in use. */
3982 static GTY(()) unsigned arange_table_in_use
;
3984 /* Size (in elements) of increments by which we may expand the
3986 #define ARANGE_TABLE_INCREMENT 64
3988 /* Array of dies for which we should generate .debug_ranges info. */
3989 static GTY ((length ("ranges_table_allocated"))) dw_ranges_ref ranges_table
;
3991 /* Number of elements currently allocated for ranges_table. */
3992 static GTY(()) unsigned ranges_table_allocated
;
3994 /* Number of elements in ranges_table currently in use. */
3995 static GTY(()) unsigned ranges_table_in_use
;
3997 /* Size (in elements) of increments by which we may expand the
3999 #define RANGES_TABLE_INCREMENT 64
4001 /* Whether we have location lists that need outputting */
4002 static GTY(()) bool have_location_lists
;
4004 /* Unique label counter. */
4005 static GTY(()) unsigned int loclabel_num
;
4007 #ifdef DWARF2_DEBUGGING_INFO
4008 /* Record whether the function being analyzed contains inlined functions. */
4009 static int current_function_has_inlines
;
4011 #if 0 && defined (MIPS_DEBUGGING_INFO)
4012 static int comp_unit_has_inlines
;
4015 /* The last file entry emitted by maybe_emit_file(). */
4016 static GTY(()) struct dwarf_file_data
* last_emitted_file
;
4018 /* Number of internal labels generated by gen_internal_sym(). */
4019 static GTY(()) int label_num
;
4021 /* Cached result of previous call to lookup_filename. */
4022 static GTY(()) struct dwarf_file_data
* file_table_last_lookup
;
4024 #ifdef DWARF2_DEBUGGING_INFO
4026 /* Offset from the "steady-state frame pointer" to the frame base,
4027 within the current function. */
4028 static HOST_WIDE_INT frame_pointer_fb_offset
;
4030 /* Forward declarations for functions defined in this file. */
4032 static int is_pseudo_reg (rtx
);
4033 static tree
type_main_variant (tree
);
4034 static int is_tagged_type (tree
);
4035 static const char *dwarf_tag_name (unsigned);
4036 static const char *dwarf_attr_name (unsigned);
4037 static const char *dwarf_form_name (unsigned);
4038 static tree
decl_ultimate_origin (tree
);
4039 static tree
block_ultimate_origin (tree
);
4040 static tree
decl_class_context (tree
);
4041 static void add_dwarf_attr (dw_die_ref
, dw_attr_ref
);
4042 static inline enum dw_val_class
AT_class (dw_attr_ref
);
4043 static void add_AT_flag (dw_die_ref
, enum dwarf_attribute
, unsigned);
4044 static inline unsigned AT_flag (dw_attr_ref
);
4045 static void add_AT_int (dw_die_ref
, enum dwarf_attribute
, HOST_WIDE_INT
);
4046 static inline HOST_WIDE_INT
AT_int (dw_attr_ref
);
4047 static void add_AT_unsigned (dw_die_ref
, enum dwarf_attribute
, unsigned HOST_WIDE_INT
);
4048 static inline unsigned HOST_WIDE_INT
AT_unsigned (dw_attr_ref
);
4049 static void add_AT_long_long (dw_die_ref
, enum dwarf_attribute
, unsigned long,
4051 static inline void add_AT_vec (dw_die_ref
, enum dwarf_attribute
, unsigned int,
4052 unsigned int, unsigned char *);
4053 static hashval_t
debug_str_do_hash (const void *);
4054 static int debug_str_eq (const void *, const void *);
4055 static void add_AT_string (dw_die_ref
, enum dwarf_attribute
, const char *);
4056 static inline const char *AT_string (dw_attr_ref
);
4057 static int AT_string_form (dw_attr_ref
);
4058 static void add_AT_die_ref (dw_die_ref
, enum dwarf_attribute
, dw_die_ref
);
4059 static void add_AT_specification (dw_die_ref
, dw_die_ref
);
4060 static inline dw_die_ref
AT_ref (dw_attr_ref
);
4061 static inline int AT_ref_external (dw_attr_ref
);
4062 static inline void set_AT_ref_external (dw_attr_ref
, int);
4063 static void add_AT_fde_ref (dw_die_ref
, enum dwarf_attribute
, unsigned);
4064 static void add_AT_loc (dw_die_ref
, enum dwarf_attribute
, dw_loc_descr_ref
);
4065 static inline dw_loc_descr_ref
AT_loc (dw_attr_ref
);
4066 static void add_AT_loc_list (dw_die_ref
, enum dwarf_attribute
,
4068 static inline dw_loc_list_ref
AT_loc_list (dw_attr_ref
);
4069 static void add_AT_addr (dw_die_ref
, enum dwarf_attribute
, rtx
);
4070 static inline rtx
AT_addr (dw_attr_ref
);
4071 static void add_AT_lbl_id (dw_die_ref
, enum dwarf_attribute
, const char *);
4072 static void add_AT_lineptr (dw_die_ref
, enum dwarf_attribute
, const char *);
4073 static void add_AT_macptr (dw_die_ref
, enum dwarf_attribute
, const char *);
4074 static void add_AT_offset (dw_die_ref
, enum dwarf_attribute
,
4075 unsigned HOST_WIDE_INT
);
4076 static void add_AT_range_list (dw_die_ref
, enum dwarf_attribute
,
4078 static inline const char *AT_lbl (dw_attr_ref
);
4079 static dw_attr_ref
get_AT (dw_die_ref
, enum dwarf_attribute
);
4080 static const char *get_AT_low_pc (dw_die_ref
);
4081 static const char *get_AT_hi_pc (dw_die_ref
);
4082 static const char *get_AT_string (dw_die_ref
, enum dwarf_attribute
);
4083 static int get_AT_flag (dw_die_ref
, enum dwarf_attribute
);
4084 static unsigned get_AT_unsigned (dw_die_ref
, enum dwarf_attribute
);
4085 static inline dw_die_ref
get_AT_ref (dw_die_ref
, enum dwarf_attribute
);
4086 static bool is_c_family (void);
4087 static bool is_cxx (void);
4088 static bool is_java (void);
4089 static bool is_fortran (void);
4090 static bool is_ada (void);
4091 static void remove_AT (dw_die_ref
, enum dwarf_attribute
);
4092 static void remove_child_TAG (dw_die_ref
, enum dwarf_tag
);
4093 static void add_child_die (dw_die_ref
, dw_die_ref
);
4094 static dw_die_ref
new_die (enum dwarf_tag
, dw_die_ref
, tree
);
4095 static dw_die_ref
lookup_type_die (tree
);
4096 static void equate_type_number_to_die (tree
, dw_die_ref
);
4097 static hashval_t
decl_die_table_hash (const void *);
4098 static int decl_die_table_eq (const void *, const void *);
4099 static dw_die_ref
lookup_decl_die (tree
);
4100 static hashval_t
decl_loc_table_hash (const void *);
4101 static int decl_loc_table_eq (const void *, const void *);
4102 static var_loc_list
*lookup_decl_loc (tree
);
4103 static void equate_decl_number_to_die (tree
, dw_die_ref
);
4104 static void add_var_loc_to_decl (tree
, struct var_loc_node
*);
4105 static void print_spaces (FILE *);
4106 static void print_die (dw_die_ref
, FILE *);
4107 static void print_dwarf_line_table (FILE *);
4108 static dw_die_ref
push_new_compile_unit (dw_die_ref
, dw_die_ref
);
4109 static dw_die_ref
pop_compile_unit (dw_die_ref
);
4110 static void loc_checksum (dw_loc_descr_ref
, struct md5_ctx
*);
4111 static void attr_checksum (dw_attr_ref
, struct md5_ctx
*, int *);
4112 static void die_checksum (dw_die_ref
, struct md5_ctx
*, int *);
4113 static int same_loc_p (dw_loc_descr_ref
, dw_loc_descr_ref
, int *);
4114 static int same_dw_val_p (dw_val_node
*, dw_val_node
*, int *);
4115 static int same_attr_p (dw_attr_ref
, dw_attr_ref
, int *);
4116 static int same_die_p (dw_die_ref
, dw_die_ref
, int *);
4117 static int same_die_p_wrap (dw_die_ref
, dw_die_ref
);
4118 static void compute_section_prefix (dw_die_ref
);
4119 static int is_type_die (dw_die_ref
);
4120 static int is_comdat_die (dw_die_ref
);
4121 static int is_symbol_die (dw_die_ref
);
4122 static void assign_symbol_names (dw_die_ref
);
4123 static void break_out_includes (dw_die_ref
);
4124 static hashval_t
htab_cu_hash (const void *);
4125 static int htab_cu_eq (const void *, const void *);
4126 static void htab_cu_del (void *);
4127 static int check_duplicate_cu (dw_die_ref
, htab_t
, unsigned *);
4128 static void record_comdat_symbol_number (dw_die_ref
, htab_t
, unsigned);
4129 static void add_sibling_attributes (dw_die_ref
);
4130 static void build_abbrev_table (dw_die_ref
);
4131 static void output_location_lists (dw_die_ref
);
4132 static int constant_size (long unsigned);
4133 static unsigned long size_of_die (dw_die_ref
);
4134 static void calc_die_sizes (dw_die_ref
);
4135 static void mark_dies (dw_die_ref
);
4136 static void unmark_dies (dw_die_ref
);
4137 static void unmark_all_dies (dw_die_ref
);
4138 static unsigned long size_of_pubnames (VEC (pubname_entry
,gc
) *);
4139 static unsigned long size_of_aranges (void);
4140 static enum dwarf_form
value_format (dw_attr_ref
);
4141 static void output_value_format (dw_attr_ref
);
4142 static void output_abbrev_section (void);
4143 static void output_die_symbol (dw_die_ref
);
4144 static void output_die (dw_die_ref
);
4145 static void output_compilation_unit_header (void);
4146 static void output_comp_unit (dw_die_ref
, int);
4147 static const char *dwarf2_name (tree
, int);
4148 static void add_pubname (tree
, dw_die_ref
);
4149 static void add_pubtype (tree
, dw_die_ref
);
4150 static void output_pubnames (VEC (pubname_entry
,gc
) *);
4151 static void add_arange (tree
, dw_die_ref
);
4152 static void output_aranges (void);
4153 static unsigned int add_ranges (tree
);
4154 static void output_ranges (void);
4155 static void output_line_info (void);
4156 static void output_file_names (void);
4157 static dw_die_ref
base_type_die (tree
);
4158 static int is_base_type (tree
);
4159 static bool is_subrange_type (tree
);
4160 static dw_die_ref
subrange_type_die (tree
, dw_die_ref
);
4161 static dw_die_ref
modified_type_die (tree
, int, int, dw_die_ref
);
4162 static int type_is_enum (tree
);
4163 static unsigned int dbx_reg_number (rtx
);
4164 static void add_loc_descr_op_piece (dw_loc_descr_ref
*, int);
4165 static dw_loc_descr_ref
reg_loc_descriptor (rtx
);
4166 static dw_loc_descr_ref
one_reg_loc_descriptor (unsigned int);
4167 static dw_loc_descr_ref
multiple_reg_loc_descriptor (rtx
, rtx
);
4168 static dw_loc_descr_ref
int_loc_descriptor (HOST_WIDE_INT
);
4169 static dw_loc_descr_ref
based_loc_descr (rtx
, HOST_WIDE_INT
);
4170 static int is_based_loc (rtx
);
4171 static dw_loc_descr_ref
mem_loc_descriptor (rtx
, enum machine_mode mode
);
4172 static dw_loc_descr_ref
concat_loc_descriptor (rtx
, rtx
);
4173 static dw_loc_descr_ref
loc_descriptor (rtx
);
4174 static dw_loc_descr_ref
loc_descriptor_from_tree_1 (tree
, int);
4175 static dw_loc_descr_ref
loc_descriptor_from_tree (tree
);
4176 static HOST_WIDE_INT
ceiling (HOST_WIDE_INT
, unsigned int);
4177 static tree
field_type (tree
);
4178 static unsigned int simple_type_align_in_bits (tree
);
4179 static unsigned int simple_decl_align_in_bits (tree
);
4180 static unsigned HOST_WIDE_INT
simple_type_size_in_bits (tree
);
4181 static HOST_WIDE_INT
field_byte_offset (tree
);
4182 static void add_AT_location_description (dw_die_ref
, enum dwarf_attribute
,
4184 static void add_data_member_location_attribute (dw_die_ref
, tree
);
4185 static void add_const_value_attribute (dw_die_ref
, rtx
);
4186 static void insert_int (HOST_WIDE_INT
, unsigned, unsigned char *);
4187 static HOST_WIDE_INT
extract_int (const unsigned char *, unsigned);
4188 static void insert_float (rtx
, unsigned char *);
4189 static rtx
rtl_for_decl_location (tree
);
4190 static void add_location_or_const_value_attribute (dw_die_ref
, tree
,
4191 enum dwarf_attribute
);
4192 static void tree_add_const_value_attribute (dw_die_ref
, tree
);
4193 static void add_name_attribute (dw_die_ref
, const char *);
4194 static void add_comp_dir_attribute (dw_die_ref
);
4195 static void add_bound_info (dw_die_ref
, enum dwarf_attribute
, tree
);
4196 static void add_subscript_info (dw_die_ref
, tree
);
4197 static void add_byte_size_attribute (dw_die_ref
, tree
);
4198 static void add_bit_offset_attribute (dw_die_ref
, tree
);
4199 static void add_bit_size_attribute (dw_die_ref
, tree
);
4200 static void add_prototyped_attribute (dw_die_ref
, tree
);
4201 static void add_abstract_origin_attribute (dw_die_ref
, tree
);
4202 static void add_pure_or_virtual_attribute (dw_die_ref
, tree
);
4203 static void add_src_coords_attributes (dw_die_ref
, tree
);
4204 static void add_name_and_src_coords_attributes (dw_die_ref
, tree
);
4205 static void push_decl_scope (tree
);
4206 static void pop_decl_scope (void);
4207 static dw_die_ref
scope_die_for (tree
, dw_die_ref
);
4208 static inline int local_scope_p (dw_die_ref
);
4209 static inline int class_or_namespace_scope_p (dw_die_ref
);
4210 static void add_type_attribute (dw_die_ref
, tree
, int, int, dw_die_ref
);
4211 static void add_calling_convention_attribute (dw_die_ref
, tree
);
4212 static const char *type_tag (tree
);
4213 static tree
member_declared_type (tree
);
4215 static const char *decl_start_label (tree
);
4217 static void gen_array_type_die (tree
, dw_die_ref
);
4219 static void gen_entry_point_die (tree
, dw_die_ref
);
4221 static void gen_inlined_enumeration_type_die (tree
, dw_die_ref
);
4222 static void gen_inlined_structure_type_die (tree
, dw_die_ref
);
4223 static void gen_inlined_union_type_die (tree
, dw_die_ref
);
4224 static dw_die_ref
gen_enumeration_type_die (tree
, dw_die_ref
);
4225 static dw_die_ref
gen_formal_parameter_die (tree
, dw_die_ref
);
4226 static void gen_unspecified_parameters_die (tree
, dw_die_ref
);
4227 static void gen_formal_types_die (tree
, dw_die_ref
);
4228 static void gen_subprogram_die (tree
, dw_die_ref
);
4229 static void gen_variable_die (tree
, dw_die_ref
);
4230 static void gen_label_die (tree
, dw_die_ref
);
4231 static void gen_lexical_block_die (tree
, dw_die_ref
, int);
4232 static void gen_inlined_subroutine_die (tree
, dw_die_ref
, int);
4233 static void gen_field_die (tree
, dw_die_ref
);
4234 static void gen_ptr_to_mbr_type_die (tree
, dw_die_ref
);
4235 static dw_die_ref
gen_compile_unit_die (const char *);
4236 static void gen_inheritance_die (tree
, tree
, dw_die_ref
);
4237 static void gen_member_die (tree
, dw_die_ref
);
4238 static void gen_struct_or_union_type_die (tree
, dw_die_ref
);
4239 static void gen_subroutine_type_die (tree
, dw_die_ref
);
4240 static void gen_typedef_die (tree
, dw_die_ref
);
4241 static void gen_type_die (tree
, dw_die_ref
);
4242 static void gen_tagged_type_instantiation_die (tree
, dw_die_ref
);
4243 static void gen_block_die (tree
, dw_die_ref
, int);
4244 static void decls_for_scope (tree
, dw_die_ref
, int);
4245 static int is_redundant_typedef (tree
);
4246 static void gen_namespace_die (tree
);
4247 static void gen_decl_die (tree
, dw_die_ref
);
4248 static dw_die_ref
force_decl_die (tree
);
4249 static dw_die_ref
force_type_die (tree
);
4250 static dw_die_ref
setup_namespace_context (tree
, dw_die_ref
);
4251 static void declare_in_namespace (tree
, dw_die_ref
);
4252 static struct dwarf_file_data
* lookup_filename (const char *);
4253 static void retry_incomplete_types (void);
4254 static void gen_type_die_for_member (tree
, tree
, dw_die_ref
);
4255 static void splice_child_die (dw_die_ref
, dw_die_ref
);
4256 static int file_info_cmp (const void *, const void *);
4257 static dw_loc_list_ref
new_loc_list (dw_loc_descr_ref
, const char *,
4258 const char *, const char *, unsigned);
4259 static void add_loc_descr_to_loc_list (dw_loc_list_ref
*, dw_loc_descr_ref
,
4260 const char *, const char *,
4262 static void output_loc_list (dw_loc_list_ref
);
4263 static char *gen_internal_sym (const char *);
4265 static void prune_unmark_dies (dw_die_ref
);
4266 static void prune_unused_types_mark (dw_die_ref
, int);
4267 static void prune_unused_types_walk (dw_die_ref
);
4268 static void prune_unused_types_walk_attribs (dw_die_ref
);
4269 static void prune_unused_types_prune (dw_die_ref
);
4270 static void prune_unused_types (void);
4271 static int maybe_emit_file (struct dwarf_file_data
*fd
);
4273 /* Section names used to hold DWARF debugging information. */
4274 #ifndef DEBUG_INFO_SECTION
4275 #define DEBUG_INFO_SECTION ".debug_info"
4277 #ifndef DEBUG_ABBREV_SECTION
4278 #define DEBUG_ABBREV_SECTION ".debug_abbrev"
4280 #ifndef DEBUG_ARANGES_SECTION
4281 #define DEBUG_ARANGES_SECTION ".debug_aranges"
4283 #ifndef DEBUG_MACINFO_SECTION
4284 #define DEBUG_MACINFO_SECTION ".debug_macinfo"
4286 #ifndef DEBUG_LINE_SECTION
4287 #define DEBUG_LINE_SECTION ".debug_line"
4289 #ifndef DEBUG_LOC_SECTION
4290 #define DEBUG_LOC_SECTION ".debug_loc"
4292 #ifndef DEBUG_PUBNAMES_SECTION
4293 #define DEBUG_PUBNAMES_SECTION ".debug_pubnames"
4295 #ifndef DEBUG_STR_SECTION
4296 #define DEBUG_STR_SECTION ".debug_str"
4298 #ifndef DEBUG_RANGES_SECTION
4299 #define DEBUG_RANGES_SECTION ".debug_ranges"
4302 /* Standard ELF section names for compiled code and data. */
4303 #ifndef TEXT_SECTION_NAME
4304 #define TEXT_SECTION_NAME ".text"
4307 /* Section flags for .debug_str section. */
4308 #define DEBUG_STR_SECTION_FLAGS \
4309 (HAVE_GAS_SHF_MERGE && flag_merge_constants \
4310 ? SECTION_DEBUG | SECTION_MERGE | SECTION_STRINGS | 1 \
4313 /* Labels we insert at beginning sections we can reference instead of
4314 the section names themselves. */
4316 #ifndef TEXT_SECTION_LABEL
4317 #define TEXT_SECTION_LABEL "Ltext"
4319 #ifndef COLD_TEXT_SECTION_LABEL
4320 #define COLD_TEXT_SECTION_LABEL "Ltext_cold"
4322 #ifndef DEBUG_LINE_SECTION_LABEL
4323 #define DEBUG_LINE_SECTION_LABEL "Ldebug_line"
4325 #ifndef DEBUG_INFO_SECTION_LABEL
4326 #define DEBUG_INFO_SECTION_LABEL "Ldebug_info"
4328 #ifndef DEBUG_ABBREV_SECTION_LABEL
4329 #define DEBUG_ABBREV_SECTION_LABEL "Ldebug_abbrev"
4331 #ifndef DEBUG_LOC_SECTION_LABEL
4332 #define DEBUG_LOC_SECTION_LABEL "Ldebug_loc"
4334 #ifndef DEBUG_RANGES_SECTION_LABEL
4335 #define DEBUG_RANGES_SECTION_LABEL "Ldebug_ranges"
4337 #ifndef DEBUG_MACINFO_SECTION_LABEL
4338 #define DEBUG_MACINFO_SECTION_LABEL "Ldebug_macinfo"
4341 /* Definitions of defaults for formats and names of various special
4342 (artificial) labels which may be generated within this file (when the -g
4343 options is used and DWARF2_DEBUGGING_INFO is in effect.
4344 If necessary, these may be overridden from within the tm.h file, but
4345 typically, overriding these defaults is unnecessary. */
4347 static char text_end_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4348 static char text_section_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4349 static char cold_text_section_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4350 static char cold_end_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4351 static char abbrev_section_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4352 static char debug_info_section_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4353 static char debug_line_section_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4354 static char macinfo_section_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4355 static char loc_section_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
4356 static char ranges_section_label
[2 * MAX_ARTIFICIAL_LABEL_BYTES
];
4358 #ifndef TEXT_END_LABEL
4359 #define TEXT_END_LABEL "Letext"
4361 #ifndef COLD_END_LABEL
4362 #define COLD_END_LABEL "Letext_cold"
4364 #ifndef BLOCK_BEGIN_LABEL
4365 #define BLOCK_BEGIN_LABEL "LBB"
4367 #ifndef BLOCK_END_LABEL
4368 #define BLOCK_END_LABEL "LBE"
4370 #ifndef LINE_CODE_LABEL
4371 #define LINE_CODE_LABEL "LM"
4373 #ifndef SEPARATE_LINE_CODE_LABEL
4374 #define SEPARATE_LINE_CODE_LABEL "LSM"
4377 /* We allow a language front-end to designate a function that is to be
4378 called to "demangle" any name before it is put into a DIE. */
4380 static const char *(*demangle_name_func
) (const char *);
4383 dwarf2out_set_demangle_name_func (const char *(*func
) (const char *))
4385 demangle_name_func
= func
;
4388 /* Test if rtl node points to a pseudo register. */
4391 is_pseudo_reg (rtx rtl
)
4393 return ((REG_P (rtl
) && REGNO (rtl
) >= FIRST_PSEUDO_REGISTER
)
4394 || (GET_CODE (rtl
) == SUBREG
4395 && REGNO (SUBREG_REG (rtl
)) >= FIRST_PSEUDO_REGISTER
));
4398 /* Return a reference to a type, with its const and volatile qualifiers
4402 type_main_variant (tree type
)
4404 type
= TYPE_MAIN_VARIANT (type
);
4406 /* ??? There really should be only one main variant among any group of
4407 variants of a given type (and all of the MAIN_VARIANT values for all
4408 members of the group should point to that one type) but sometimes the C
4409 front-end messes this up for array types, so we work around that bug
4411 if (TREE_CODE (type
) == ARRAY_TYPE
)
4412 while (type
!= TYPE_MAIN_VARIANT (type
))
4413 type
= TYPE_MAIN_VARIANT (type
);
4418 /* Return nonzero if the given type node represents a tagged type. */
4421 is_tagged_type (tree type
)
4423 enum tree_code code
= TREE_CODE (type
);
4425 return (code
== RECORD_TYPE
|| code
== UNION_TYPE
4426 || code
== QUAL_UNION_TYPE
|| code
== ENUMERAL_TYPE
);
4429 /* Convert a DIE tag into its string name. */
4432 dwarf_tag_name (unsigned int tag
)
4436 case DW_TAG_padding
:
4437 return "DW_TAG_padding";
4438 case DW_TAG_array_type
:
4439 return "DW_TAG_array_type";
4440 case DW_TAG_class_type
:
4441 return "DW_TAG_class_type";
4442 case DW_TAG_entry_point
:
4443 return "DW_TAG_entry_point";
4444 case DW_TAG_enumeration_type
:
4445 return "DW_TAG_enumeration_type";
4446 case DW_TAG_formal_parameter
:
4447 return "DW_TAG_formal_parameter";
4448 case DW_TAG_imported_declaration
:
4449 return "DW_TAG_imported_declaration";
4451 return "DW_TAG_label";
4452 case DW_TAG_lexical_block
:
4453 return "DW_TAG_lexical_block";
4455 return "DW_TAG_member";
4456 case DW_TAG_pointer_type
:
4457 return "DW_TAG_pointer_type";
4458 case DW_TAG_reference_type
:
4459 return "DW_TAG_reference_type";
4460 case DW_TAG_compile_unit
:
4461 return "DW_TAG_compile_unit";
4462 case DW_TAG_string_type
:
4463 return "DW_TAG_string_type";
4464 case DW_TAG_structure_type
:
4465 return "DW_TAG_structure_type";
4466 case DW_TAG_subroutine_type
:
4467 return "DW_TAG_subroutine_type";
4468 case DW_TAG_typedef
:
4469 return "DW_TAG_typedef";
4470 case DW_TAG_union_type
:
4471 return "DW_TAG_union_type";
4472 case DW_TAG_unspecified_parameters
:
4473 return "DW_TAG_unspecified_parameters";
4474 case DW_TAG_variant
:
4475 return "DW_TAG_variant";
4476 case DW_TAG_common_block
:
4477 return "DW_TAG_common_block";
4478 case DW_TAG_common_inclusion
:
4479 return "DW_TAG_common_inclusion";
4480 case DW_TAG_inheritance
:
4481 return "DW_TAG_inheritance";
4482 case DW_TAG_inlined_subroutine
:
4483 return "DW_TAG_inlined_subroutine";
4485 return "DW_TAG_module";
4486 case DW_TAG_ptr_to_member_type
:
4487 return "DW_TAG_ptr_to_member_type";
4488 case DW_TAG_set_type
:
4489 return "DW_TAG_set_type";
4490 case DW_TAG_subrange_type
:
4491 return "DW_TAG_subrange_type";
4492 case DW_TAG_with_stmt
:
4493 return "DW_TAG_with_stmt";
4494 case DW_TAG_access_declaration
:
4495 return "DW_TAG_access_declaration";
4496 case DW_TAG_base_type
:
4497 return "DW_TAG_base_type";
4498 case DW_TAG_catch_block
:
4499 return "DW_TAG_catch_block";
4500 case DW_TAG_const_type
:
4501 return "DW_TAG_const_type";
4502 case DW_TAG_constant
:
4503 return "DW_TAG_constant";
4504 case DW_TAG_enumerator
:
4505 return "DW_TAG_enumerator";
4506 case DW_TAG_file_type
:
4507 return "DW_TAG_file_type";
4509 return "DW_TAG_friend";
4510 case DW_TAG_namelist
:
4511 return "DW_TAG_namelist";
4512 case DW_TAG_namelist_item
:
4513 return "DW_TAG_namelist_item";
4514 case DW_TAG_namespace
:
4515 return "DW_TAG_namespace";
4516 case DW_TAG_packed_type
:
4517 return "DW_TAG_packed_type";
4518 case DW_TAG_subprogram
:
4519 return "DW_TAG_subprogram";
4520 case DW_TAG_template_type_param
:
4521 return "DW_TAG_template_type_param";
4522 case DW_TAG_template_value_param
:
4523 return "DW_TAG_template_value_param";
4524 case DW_TAG_thrown_type
:
4525 return "DW_TAG_thrown_type";
4526 case DW_TAG_try_block
:
4527 return "DW_TAG_try_block";
4528 case DW_TAG_variant_part
:
4529 return "DW_TAG_variant_part";
4530 case DW_TAG_variable
:
4531 return "DW_TAG_variable";
4532 case DW_TAG_volatile_type
:
4533 return "DW_TAG_volatile_type";
4534 case DW_TAG_imported_module
:
4535 return "DW_TAG_imported_module";
4536 case DW_TAG_MIPS_loop
:
4537 return "DW_TAG_MIPS_loop";
4538 case DW_TAG_format_label
:
4539 return "DW_TAG_format_label";
4540 case DW_TAG_function_template
:
4541 return "DW_TAG_function_template";
4542 case DW_TAG_class_template
:
4543 return "DW_TAG_class_template";
4544 case DW_TAG_GNU_BINCL
:
4545 return "DW_TAG_GNU_BINCL";
4546 case DW_TAG_GNU_EINCL
:
4547 return "DW_TAG_GNU_EINCL";
4549 return "DW_TAG_<unknown>";
4553 /* Convert a DWARF attribute code into its string name. */
4556 dwarf_attr_name (unsigned int attr
)
4561 return "DW_AT_sibling";
4562 case DW_AT_location
:
4563 return "DW_AT_location";
4565 return "DW_AT_name";
4566 case DW_AT_ordering
:
4567 return "DW_AT_ordering";
4568 case DW_AT_subscr_data
:
4569 return "DW_AT_subscr_data";
4570 case DW_AT_byte_size
:
4571 return "DW_AT_byte_size";
4572 case DW_AT_bit_offset
:
4573 return "DW_AT_bit_offset";
4574 case DW_AT_bit_size
:
4575 return "DW_AT_bit_size";
4576 case DW_AT_element_list
:
4577 return "DW_AT_element_list";
4578 case DW_AT_stmt_list
:
4579 return "DW_AT_stmt_list";
4581 return "DW_AT_low_pc";
4583 return "DW_AT_high_pc";
4584 case DW_AT_language
:
4585 return "DW_AT_language";
4587 return "DW_AT_member";
4589 return "DW_AT_discr";
4590 case DW_AT_discr_value
:
4591 return "DW_AT_discr_value";
4592 case DW_AT_visibility
:
4593 return "DW_AT_visibility";
4595 return "DW_AT_import";
4596 case DW_AT_string_length
:
4597 return "DW_AT_string_length";
4598 case DW_AT_common_reference
:
4599 return "DW_AT_common_reference";
4600 case DW_AT_comp_dir
:
4601 return "DW_AT_comp_dir";
4602 case DW_AT_const_value
:
4603 return "DW_AT_const_value";
4604 case DW_AT_containing_type
:
4605 return "DW_AT_containing_type";
4606 case DW_AT_default_value
:
4607 return "DW_AT_default_value";
4609 return "DW_AT_inline";
4610 case DW_AT_is_optional
:
4611 return "DW_AT_is_optional";
4612 case DW_AT_lower_bound
:
4613 return "DW_AT_lower_bound";
4614 case DW_AT_producer
:
4615 return "DW_AT_producer";
4616 case DW_AT_prototyped
:
4617 return "DW_AT_prototyped";
4618 case DW_AT_return_addr
:
4619 return "DW_AT_return_addr";
4620 case DW_AT_start_scope
:
4621 return "DW_AT_start_scope";
4622 case DW_AT_stride_size
:
4623 return "DW_AT_stride_size";
4624 case DW_AT_upper_bound
:
4625 return "DW_AT_upper_bound";
4626 case DW_AT_abstract_origin
:
4627 return "DW_AT_abstract_origin";
4628 case DW_AT_accessibility
:
4629 return "DW_AT_accessibility";
4630 case DW_AT_address_class
:
4631 return "DW_AT_address_class";
4632 case DW_AT_artificial
:
4633 return "DW_AT_artificial";
4634 case DW_AT_base_types
:
4635 return "DW_AT_base_types";
4636 case DW_AT_calling_convention
:
4637 return "DW_AT_calling_convention";
4639 return "DW_AT_count";
4640 case DW_AT_data_member_location
:
4641 return "DW_AT_data_member_location";
4642 case DW_AT_decl_column
:
4643 return "DW_AT_decl_column";
4644 case DW_AT_decl_file
:
4645 return "DW_AT_decl_file";
4646 case DW_AT_decl_line
:
4647 return "DW_AT_decl_line";
4648 case DW_AT_declaration
:
4649 return "DW_AT_declaration";
4650 case DW_AT_discr_list
:
4651 return "DW_AT_discr_list";
4652 case DW_AT_encoding
:
4653 return "DW_AT_encoding";
4654 case DW_AT_external
:
4655 return "DW_AT_external";
4656 case DW_AT_frame_base
:
4657 return "DW_AT_frame_base";
4659 return "DW_AT_friend";
4660 case DW_AT_identifier_case
:
4661 return "DW_AT_identifier_case";
4662 case DW_AT_macro_info
:
4663 return "DW_AT_macro_info";
4664 case DW_AT_namelist_items
:
4665 return "DW_AT_namelist_items";
4666 case DW_AT_priority
:
4667 return "DW_AT_priority";
4669 return "DW_AT_segment";
4670 case DW_AT_specification
:
4671 return "DW_AT_specification";
4672 case DW_AT_static_link
:
4673 return "DW_AT_static_link";
4675 return "DW_AT_type";
4676 case DW_AT_use_location
:
4677 return "DW_AT_use_location";
4678 case DW_AT_variable_parameter
:
4679 return "DW_AT_variable_parameter";
4680 case DW_AT_virtuality
:
4681 return "DW_AT_virtuality";
4682 case DW_AT_vtable_elem_location
:
4683 return "DW_AT_vtable_elem_location";
4685 case DW_AT_allocated
:
4686 return "DW_AT_allocated";
4687 case DW_AT_associated
:
4688 return "DW_AT_associated";
4689 case DW_AT_data_location
:
4690 return "DW_AT_data_location";
4692 return "DW_AT_stride";
4693 case DW_AT_entry_pc
:
4694 return "DW_AT_entry_pc";
4695 case DW_AT_use_UTF8
:
4696 return "DW_AT_use_UTF8";
4697 case DW_AT_extension
:
4698 return "DW_AT_extension";
4700 return "DW_AT_ranges";
4701 case DW_AT_trampoline
:
4702 return "DW_AT_trampoline";
4703 case DW_AT_call_column
:
4704 return "DW_AT_call_column";
4705 case DW_AT_call_file
:
4706 return "DW_AT_call_file";
4707 case DW_AT_call_line
:
4708 return "DW_AT_call_line";
4710 case DW_AT_MIPS_fde
:
4711 return "DW_AT_MIPS_fde";
4712 case DW_AT_MIPS_loop_begin
:
4713 return "DW_AT_MIPS_loop_begin";
4714 case DW_AT_MIPS_tail_loop_begin
:
4715 return "DW_AT_MIPS_tail_loop_begin";
4716 case DW_AT_MIPS_epilog_begin
:
4717 return "DW_AT_MIPS_epilog_begin";
4718 case DW_AT_MIPS_loop_unroll_factor
:
4719 return "DW_AT_MIPS_loop_unroll_factor";
4720 case DW_AT_MIPS_software_pipeline_depth
:
4721 return "DW_AT_MIPS_software_pipeline_depth";
4722 case DW_AT_MIPS_linkage_name
:
4723 return "DW_AT_MIPS_linkage_name";
4724 case DW_AT_MIPS_stride
:
4725 return "DW_AT_MIPS_stride";
4726 case DW_AT_MIPS_abstract_name
:
4727 return "DW_AT_MIPS_abstract_name";
4728 case DW_AT_MIPS_clone_origin
:
4729 return "DW_AT_MIPS_clone_origin";
4730 case DW_AT_MIPS_has_inlines
:
4731 return "DW_AT_MIPS_has_inlines";
4733 case DW_AT_sf_names
:
4734 return "DW_AT_sf_names";
4735 case DW_AT_src_info
:
4736 return "DW_AT_src_info";
4737 case DW_AT_mac_info
:
4738 return "DW_AT_mac_info";
4739 case DW_AT_src_coords
:
4740 return "DW_AT_src_coords";
4741 case DW_AT_body_begin
:
4742 return "DW_AT_body_begin";
4743 case DW_AT_body_end
:
4744 return "DW_AT_body_end";
4745 case DW_AT_GNU_vector
:
4746 return "DW_AT_GNU_vector";
4748 case DW_AT_VMS_rtnbeg_pd_address
:
4749 return "DW_AT_VMS_rtnbeg_pd_address";
4752 return "DW_AT_<unknown>";
4756 /* Convert a DWARF value form code into its string name. */
4759 dwarf_form_name (unsigned int form
)
4764 return "DW_FORM_addr";
4765 case DW_FORM_block2
:
4766 return "DW_FORM_block2";
4767 case DW_FORM_block4
:
4768 return "DW_FORM_block4";
4770 return "DW_FORM_data2";
4772 return "DW_FORM_data4";
4774 return "DW_FORM_data8";
4775 case DW_FORM_string
:
4776 return "DW_FORM_string";
4778 return "DW_FORM_block";
4779 case DW_FORM_block1
:
4780 return "DW_FORM_block1";
4782 return "DW_FORM_data1";
4784 return "DW_FORM_flag";
4786 return "DW_FORM_sdata";
4788 return "DW_FORM_strp";
4790 return "DW_FORM_udata";
4791 case DW_FORM_ref_addr
:
4792 return "DW_FORM_ref_addr";
4794 return "DW_FORM_ref1";
4796 return "DW_FORM_ref2";
4798 return "DW_FORM_ref4";
4800 return "DW_FORM_ref8";
4801 case DW_FORM_ref_udata
:
4802 return "DW_FORM_ref_udata";
4803 case DW_FORM_indirect
:
4804 return "DW_FORM_indirect";
4806 return "DW_FORM_<unknown>";
4810 /* Determine the "ultimate origin" of a decl. The decl may be an inlined
4811 instance of an inlined instance of a decl which is local to an inline
4812 function, so we have to trace all of the way back through the origin chain
4813 to find out what sort of node actually served as the original seed for the
4817 decl_ultimate_origin (tree decl
)
4819 if (!CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_COMMON
))
4822 /* output_inline_function sets DECL_ABSTRACT_ORIGIN for all the
4823 nodes in the function to point to themselves; ignore that if
4824 we're trying to output the abstract instance of this function. */
4825 if (DECL_ABSTRACT (decl
) && DECL_ABSTRACT_ORIGIN (decl
) == decl
)
4828 /* Since the DECL_ABSTRACT_ORIGIN for a DECL is supposed to be the
4829 most distant ancestor, this should never happen. */
4830 gcc_assert (!DECL_FROM_INLINE (DECL_ORIGIN (decl
)));
4832 return DECL_ABSTRACT_ORIGIN (decl
);
4835 /* Determine the "ultimate origin" of a block. The block may be an inlined
4836 instance of an inlined instance of a block which is local to an inline
4837 function, so we have to trace all of the way back through the origin chain
4838 to find out what sort of node actually served as the original seed for the
4842 block_ultimate_origin (tree block
)
4844 tree immediate_origin
= BLOCK_ABSTRACT_ORIGIN (block
);
4846 /* output_inline_function sets BLOCK_ABSTRACT_ORIGIN for all the
4847 nodes in the function to point to themselves; ignore that if
4848 we're trying to output the abstract instance of this function. */
4849 if (BLOCK_ABSTRACT (block
) && immediate_origin
== block
)
4852 if (immediate_origin
== NULL_TREE
)
4857 tree lookahead
= immediate_origin
;
4861 ret_val
= lookahead
;
4862 lookahead
= (TREE_CODE (ret_val
) == BLOCK
4863 ? BLOCK_ABSTRACT_ORIGIN (ret_val
) : NULL
);
4865 while (lookahead
!= NULL
&& lookahead
!= ret_val
);
4867 /* The block's abstract origin chain may not be the *ultimate* origin of
4868 the block. It could lead to a DECL that has an abstract origin set.
4869 If so, we want that DECL's abstract origin (which is what DECL_ORIGIN
4870 will give us if it has one). Note that DECL's abstract origins are
4871 supposed to be the most distant ancestor (or so decl_ultimate_origin
4872 claims), so we don't need to loop following the DECL origins. */
4873 if (DECL_P (ret_val
))
4874 return DECL_ORIGIN (ret_val
);
4880 /* Get the class to which DECL belongs, if any. In g++, the DECL_CONTEXT
4881 of a virtual function may refer to a base class, so we check the 'this'
4885 decl_class_context (tree decl
)
4887 tree context
= NULL_TREE
;
4889 if (TREE_CODE (decl
) != FUNCTION_DECL
|| ! DECL_VINDEX (decl
))
4890 context
= DECL_CONTEXT (decl
);
4892 context
= TYPE_MAIN_VARIANT
4893 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
4895 if (context
&& !TYPE_P (context
))
4896 context
= NULL_TREE
;
4901 /* Add an attribute/value pair to a DIE. */
4904 add_dwarf_attr (dw_die_ref die
, dw_attr_ref attr
)
4906 /* Maybe this should be an assert? */
4910 if (die
->die_attr
== NULL
)
4911 die
->die_attr
= VEC_alloc (dw_attr_node
, gc
, 1);
4912 VEC_safe_push (dw_attr_node
, gc
, die
->die_attr
, attr
);
4915 static inline enum dw_val_class
4916 AT_class (dw_attr_ref a
)
4918 return a
->dw_attr_val
.val_class
;
4921 /* Add a flag value attribute to a DIE. */
4924 add_AT_flag (dw_die_ref die
, enum dwarf_attribute attr_kind
, unsigned int flag
)
4928 attr
.dw_attr
= attr_kind
;
4929 attr
.dw_attr_val
.val_class
= dw_val_class_flag
;
4930 attr
.dw_attr_val
.v
.val_flag
= flag
;
4931 add_dwarf_attr (die
, &attr
);
4934 static inline unsigned
4935 AT_flag (dw_attr_ref a
)
4937 gcc_assert (a
&& AT_class (a
) == dw_val_class_flag
);
4938 return a
->dw_attr_val
.v
.val_flag
;
4941 /* Add a signed integer attribute value to a DIE. */
4944 add_AT_int (dw_die_ref die
, enum dwarf_attribute attr_kind
, HOST_WIDE_INT int_val
)
4948 attr
.dw_attr
= attr_kind
;
4949 attr
.dw_attr_val
.val_class
= dw_val_class_const
;
4950 attr
.dw_attr_val
.v
.val_int
= int_val
;
4951 add_dwarf_attr (die
, &attr
);
4954 static inline HOST_WIDE_INT
4955 AT_int (dw_attr_ref a
)
4957 gcc_assert (a
&& AT_class (a
) == dw_val_class_const
);
4958 return a
->dw_attr_val
.v
.val_int
;
4961 /* Add an unsigned integer attribute value to a DIE. */
4964 add_AT_unsigned (dw_die_ref die
, enum dwarf_attribute attr_kind
,
4965 unsigned HOST_WIDE_INT unsigned_val
)
4969 attr
.dw_attr
= attr_kind
;
4970 attr
.dw_attr_val
.val_class
= dw_val_class_unsigned_const
;
4971 attr
.dw_attr_val
.v
.val_unsigned
= unsigned_val
;
4972 add_dwarf_attr (die
, &attr
);
4975 static inline unsigned HOST_WIDE_INT
4976 AT_unsigned (dw_attr_ref a
)
4978 gcc_assert (a
&& AT_class (a
) == dw_val_class_unsigned_const
);
4979 return a
->dw_attr_val
.v
.val_unsigned
;
4982 /* Add an unsigned double integer attribute value to a DIE. */
4985 add_AT_long_long (dw_die_ref die
, enum dwarf_attribute attr_kind
,
4986 long unsigned int val_hi
, long unsigned int val_low
)
4990 attr
.dw_attr
= attr_kind
;
4991 attr
.dw_attr_val
.val_class
= dw_val_class_long_long
;
4992 attr
.dw_attr_val
.v
.val_long_long
.hi
= val_hi
;
4993 attr
.dw_attr_val
.v
.val_long_long
.low
= val_low
;
4994 add_dwarf_attr (die
, &attr
);
4997 /* Add a floating point attribute value to a DIE and return it. */
5000 add_AT_vec (dw_die_ref die
, enum dwarf_attribute attr_kind
,
5001 unsigned int length
, unsigned int elt_size
, unsigned char *array
)
5005 attr
.dw_attr
= attr_kind
;
5006 attr
.dw_attr_val
.val_class
= dw_val_class_vec
;
5007 attr
.dw_attr_val
.v
.val_vec
.length
= length
;
5008 attr
.dw_attr_val
.v
.val_vec
.elt_size
= elt_size
;
5009 attr
.dw_attr_val
.v
.val_vec
.array
= array
;
5010 add_dwarf_attr (die
, &attr
);
5013 /* Hash and equality functions for debug_str_hash. */
5016 debug_str_do_hash (const void *x
)
5018 return htab_hash_string (((const struct indirect_string_node
*)x
)->str
);
5022 debug_str_eq (const void *x1
, const void *x2
)
5024 return strcmp ((((const struct indirect_string_node
*)x1
)->str
),
5025 (const char *)x2
) == 0;
5028 /* Add a string attribute value to a DIE. */
5031 add_AT_string (dw_die_ref die
, enum dwarf_attribute attr_kind
, const char *str
)
5034 struct indirect_string_node
*node
;
5037 if (! debug_str_hash
)
5038 debug_str_hash
= htab_create_ggc (10, debug_str_do_hash
,
5039 debug_str_eq
, NULL
);
5041 slot
= htab_find_slot_with_hash (debug_str_hash
, str
,
5042 htab_hash_string (str
), INSERT
);
5045 node
= (struct indirect_string_node
*)
5046 ggc_alloc_cleared (sizeof (struct indirect_string_node
));
5047 node
->str
= ggc_strdup (str
);
5051 node
= (struct indirect_string_node
*) *slot
;
5055 attr
.dw_attr
= attr_kind
;
5056 attr
.dw_attr_val
.val_class
= dw_val_class_str
;
5057 attr
.dw_attr_val
.v
.val_str
= node
;
5058 add_dwarf_attr (die
, &attr
);
5061 static inline const char *
5062 AT_string (dw_attr_ref a
)
5064 gcc_assert (a
&& AT_class (a
) == dw_val_class_str
);
5065 return a
->dw_attr_val
.v
.val_str
->str
;
5068 /* Find out whether a string should be output inline in DIE
5069 or out-of-line in .debug_str section. */
5072 AT_string_form (dw_attr_ref a
)
5074 struct indirect_string_node
*node
;
5078 gcc_assert (a
&& AT_class (a
) == dw_val_class_str
);
5080 node
= a
->dw_attr_val
.v
.val_str
;
5084 len
= strlen (node
->str
) + 1;
5086 /* If the string is shorter or equal to the size of the reference, it is
5087 always better to put it inline. */
5088 if (len
<= DWARF_OFFSET_SIZE
|| node
->refcount
== 0)
5089 return node
->form
= DW_FORM_string
;
5091 /* If we cannot expect the linker to merge strings in .debug_str
5092 section, only put it into .debug_str if it is worth even in this
5094 if ((debug_str_section
->common
.flags
& SECTION_MERGE
) == 0
5095 && (len
- DWARF_OFFSET_SIZE
) * node
->refcount
<= len
)
5096 return node
->form
= DW_FORM_string
;
5098 ASM_GENERATE_INTERNAL_LABEL (label
, "LASF", dw2_string_counter
);
5099 ++dw2_string_counter
;
5100 node
->label
= xstrdup (label
);
5102 return node
->form
= DW_FORM_strp
;
5105 /* Add a DIE reference attribute value to a DIE. */
5108 add_AT_die_ref (dw_die_ref die
, enum dwarf_attribute attr_kind
, dw_die_ref targ_die
)
5112 attr
.dw_attr
= attr_kind
;
5113 attr
.dw_attr_val
.val_class
= dw_val_class_die_ref
;
5114 attr
.dw_attr_val
.v
.val_die_ref
.die
= targ_die
;
5115 attr
.dw_attr_val
.v
.val_die_ref
.external
= 0;
5116 add_dwarf_attr (die
, &attr
);
5119 /* Add an AT_specification attribute to a DIE, and also make the back
5120 pointer from the specification to the definition. */
5123 add_AT_specification (dw_die_ref die
, dw_die_ref targ_die
)
5125 add_AT_die_ref (die
, DW_AT_specification
, targ_die
);
5126 gcc_assert (!targ_die
->die_definition
);
5127 targ_die
->die_definition
= die
;
5130 static inline dw_die_ref
5131 AT_ref (dw_attr_ref a
)
5133 gcc_assert (a
&& AT_class (a
) == dw_val_class_die_ref
);
5134 return a
->dw_attr_val
.v
.val_die_ref
.die
;
5138 AT_ref_external (dw_attr_ref a
)
5140 if (a
&& AT_class (a
) == dw_val_class_die_ref
)
5141 return a
->dw_attr_val
.v
.val_die_ref
.external
;
5147 set_AT_ref_external (dw_attr_ref a
, int i
)
5149 gcc_assert (a
&& AT_class (a
) == dw_val_class_die_ref
);
5150 a
->dw_attr_val
.v
.val_die_ref
.external
= i
;
5153 /* Add an FDE reference attribute value to a DIE. */
5156 add_AT_fde_ref (dw_die_ref die
, enum dwarf_attribute attr_kind
, unsigned int targ_fde
)
5160 attr
.dw_attr
= attr_kind
;
5161 attr
.dw_attr_val
.val_class
= dw_val_class_fde_ref
;
5162 attr
.dw_attr_val
.v
.val_fde_index
= targ_fde
;
5163 add_dwarf_attr (die
, &attr
);
5166 /* Add a location description attribute value to a DIE. */
5169 add_AT_loc (dw_die_ref die
, enum dwarf_attribute attr_kind
, dw_loc_descr_ref loc
)
5173 attr
.dw_attr
= attr_kind
;
5174 attr
.dw_attr_val
.val_class
= dw_val_class_loc
;
5175 attr
.dw_attr_val
.v
.val_loc
= loc
;
5176 add_dwarf_attr (die
, &attr
);
5179 static inline dw_loc_descr_ref
5180 AT_loc (dw_attr_ref a
)
5182 gcc_assert (a
&& AT_class (a
) == dw_val_class_loc
);
5183 return a
->dw_attr_val
.v
.val_loc
;
5187 add_AT_loc_list (dw_die_ref die
, enum dwarf_attribute attr_kind
, dw_loc_list_ref loc_list
)
5191 attr
.dw_attr
= attr_kind
;
5192 attr
.dw_attr_val
.val_class
= dw_val_class_loc_list
;
5193 attr
.dw_attr_val
.v
.val_loc_list
= loc_list
;
5194 add_dwarf_attr (die
, &attr
);
5195 have_location_lists
= true;
5198 static inline dw_loc_list_ref
5199 AT_loc_list (dw_attr_ref a
)
5201 gcc_assert (a
&& AT_class (a
) == dw_val_class_loc_list
);
5202 return a
->dw_attr_val
.v
.val_loc_list
;
5205 /* Add an address constant attribute value to a DIE. */
5208 add_AT_addr (dw_die_ref die
, enum dwarf_attribute attr_kind
, rtx addr
)
5212 attr
.dw_attr
= attr_kind
;
5213 attr
.dw_attr_val
.val_class
= dw_val_class_addr
;
5214 attr
.dw_attr_val
.v
.val_addr
= addr
;
5215 add_dwarf_attr (die
, &attr
);
5218 /* Get the RTX from to an address DIE attribute. */
5221 AT_addr (dw_attr_ref a
)
5223 gcc_assert (a
&& AT_class (a
) == dw_val_class_addr
);
5224 return a
->dw_attr_val
.v
.val_addr
;
5227 /* Add a file attribute value to a DIE. */
5230 add_AT_file (dw_die_ref die
, enum dwarf_attribute attr_kind
,
5231 struct dwarf_file_data
*fd
)
5235 attr
.dw_attr
= attr_kind
;
5236 attr
.dw_attr_val
.val_class
= dw_val_class_file
;
5237 attr
.dw_attr_val
.v
.val_file
= fd
;
5238 add_dwarf_attr (die
, &attr
);
5241 /* Get the dwarf_file_data from a file DIE attribute. */
5243 static inline struct dwarf_file_data
*
5244 AT_file (dw_attr_ref a
)
5246 gcc_assert (a
&& AT_class (a
) == dw_val_class_file
);
5247 return a
->dw_attr_val
.v
.val_file
;
5250 /* Add a label identifier attribute value to a DIE. */
5253 add_AT_lbl_id (dw_die_ref die
, enum dwarf_attribute attr_kind
, const char *lbl_id
)
5257 attr
.dw_attr
= attr_kind
;
5258 attr
.dw_attr_val
.val_class
= dw_val_class_lbl_id
;
5259 attr
.dw_attr_val
.v
.val_lbl_id
= xstrdup (lbl_id
);
5260 add_dwarf_attr (die
, &attr
);
5263 /* Add a section offset attribute value to a DIE, an offset into the
5264 debug_line section. */
5267 add_AT_lineptr (dw_die_ref die
, enum dwarf_attribute attr_kind
,
5272 attr
.dw_attr
= attr_kind
;
5273 attr
.dw_attr_val
.val_class
= dw_val_class_lineptr
;
5274 attr
.dw_attr_val
.v
.val_lbl_id
= xstrdup (label
);
5275 add_dwarf_attr (die
, &attr
);
5278 /* Add a section offset attribute value to a DIE, an offset into the
5279 debug_macinfo section. */
5282 add_AT_macptr (dw_die_ref die
, enum dwarf_attribute attr_kind
,
5287 attr
.dw_attr
= attr_kind
;
5288 attr
.dw_attr_val
.val_class
= dw_val_class_macptr
;
5289 attr
.dw_attr_val
.v
.val_lbl_id
= xstrdup (label
);
5290 add_dwarf_attr (die
, &attr
);
5293 /* Add an offset attribute value to a DIE. */
5296 add_AT_offset (dw_die_ref die
, enum dwarf_attribute attr_kind
,
5297 unsigned HOST_WIDE_INT offset
)
5301 attr
.dw_attr
= attr_kind
;
5302 attr
.dw_attr_val
.val_class
= dw_val_class_offset
;
5303 attr
.dw_attr_val
.v
.val_offset
= offset
;
5304 add_dwarf_attr (die
, &attr
);
5307 /* Add an range_list attribute value to a DIE. */
5310 add_AT_range_list (dw_die_ref die
, enum dwarf_attribute attr_kind
,
5311 long unsigned int offset
)
5315 attr
.dw_attr
= attr_kind
;
5316 attr
.dw_attr_val
.val_class
= dw_val_class_range_list
;
5317 attr
.dw_attr_val
.v
.val_offset
= offset
;
5318 add_dwarf_attr (die
, &attr
);
5321 static inline const char *
5322 AT_lbl (dw_attr_ref a
)
5324 gcc_assert (a
&& (AT_class (a
) == dw_val_class_lbl_id
5325 || AT_class (a
) == dw_val_class_lineptr
5326 || AT_class (a
) == dw_val_class_macptr
));
5327 return a
->dw_attr_val
.v
.val_lbl_id
;
5330 /* Get the attribute of type attr_kind. */
5333 get_AT (dw_die_ref die
, enum dwarf_attribute attr_kind
)
5337 dw_die_ref spec
= NULL
;
5342 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
5343 if (a
->dw_attr
== attr_kind
)
5345 else if (a
->dw_attr
== DW_AT_specification
5346 || a
->dw_attr
== DW_AT_abstract_origin
)
5350 return get_AT (spec
, attr_kind
);
5355 /* Return the "low pc" attribute value, typically associated with a subprogram
5356 DIE. Return null if the "low pc" attribute is either not present, or if it
5357 cannot be represented as an assembler label identifier. */
5359 static inline const char *
5360 get_AT_low_pc (dw_die_ref die
)
5362 dw_attr_ref a
= get_AT (die
, DW_AT_low_pc
);
5364 return a
? AT_lbl (a
) : NULL
;
5367 /* Return the "high pc" attribute value, typically associated with a subprogram
5368 DIE. Return null if the "high pc" attribute is either not present, or if it
5369 cannot be represented as an assembler label identifier. */
5371 static inline const char *
5372 get_AT_hi_pc (dw_die_ref die
)
5374 dw_attr_ref a
= get_AT (die
, DW_AT_high_pc
);
5376 return a
? AT_lbl (a
) : NULL
;
5379 /* Return the value of the string attribute designated by ATTR_KIND, or
5380 NULL if it is not present. */
5382 static inline const char *
5383 get_AT_string (dw_die_ref die
, enum dwarf_attribute attr_kind
)
5385 dw_attr_ref a
= get_AT (die
, attr_kind
);
5387 return a
? AT_string (a
) : NULL
;
5390 /* Return the value of the flag attribute designated by ATTR_KIND, or -1
5391 if it is not present. */
5394 get_AT_flag (dw_die_ref die
, enum dwarf_attribute attr_kind
)
5396 dw_attr_ref a
= get_AT (die
, attr_kind
);
5398 return a
? AT_flag (a
) : 0;
5401 /* Return the value of the unsigned attribute designated by ATTR_KIND, or 0
5402 if it is not present. */
5404 static inline unsigned
5405 get_AT_unsigned (dw_die_ref die
, enum dwarf_attribute attr_kind
)
5407 dw_attr_ref a
= get_AT (die
, attr_kind
);
5409 return a
? AT_unsigned (a
) : 0;
5412 static inline dw_die_ref
5413 get_AT_ref (dw_die_ref die
, enum dwarf_attribute attr_kind
)
5415 dw_attr_ref a
= get_AT (die
, attr_kind
);
5417 return a
? AT_ref (a
) : NULL
;
5420 static inline struct dwarf_file_data
*
5421 get_AT_file (dw_die_ref die
, enum dwarf_attribute attr_kind
)
5423 dw_attr_ref a
= get_AT (die
, attr_kind
);
5425 return a
? AT_file (a
) : NULL
;
5428 /* Return TRUE if the language is C or C++. */
5433 unsigned int lang
= get_AT_unsigned (comp_unit_die
, DW_AT_language
);
5435 return (lang
== DW_LANG_C
|| lang
== DW_LANG_C89
|| lang
== DW_LANG_ObjC
5436 || lang
== DW_LANG_C99
5437 || lang
== DW_LANG_C_plus_plus
|| lang
== DW_LANG_ObjC_plus_plus
);
5440 /* Return TRUE if the language is C++. */
5445 unsigned int lang
= get_AT_unsigned (comp_unit_die
, DW_AT_language
);
5447 return lang
== DW_LANG_C_plus_plus
|| lang
== DW_LANG_ObjC_plus_plus
;
5450 /* Return TRUE if the language is Fortran. */
5455 unsigned int lang
= get_AT_unsigned (comp_unit_die
, DW_AT_language
);
5457 return (lang
== DW_LANG_Fortran77
5458 || lang
== DW_LANG_Fortran90
5459 || lang
== DW_LANG_Fortran95
);
5462 /* Return TRUE if the language is Java. */
5467 unsigned int lang
= get_AT_unsigned (comp_unit_die
, DW_AT_language
);
5469 return lang
== DW_LANG_Java
;
5472 /* Return TRUE if the language is Ada. */
5477 unsigned int lang
= get_AT_unsigned (comp_unit_die
, DW_AT_language
);
5479 return lang
== DW_LANG_Ada95
|| lang
== DW_LANG_Ada83
;
5482 /* Remove the specified attribute if present. */
5485 remove_AT (dw_die_ref die
, enum dwarf_attribute attr_kind
)
5493 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
5494 if (a
->dw_attr
== attr_kind
)
5496 if (AT_class (a
) == dw_val_class_str
)
5497 if (a
->dw_attr_val
.v
.val_str
->refcount
)
5498 a
->dw_attr_val
.v
.val_str
->refcount
--;
5500 /* VEC_ordered_remove should help reduce the number of abbrevs
5502 VEC_ordered_remove (dw_attr_node
, die
->die_attr
, ix
);
5507 /* Remove CHILD from its parent. PREV must have the property that
5508 PREV->DIE_SIB == CHILD. Does not alter CHILD. */
5511 remove_child_with_prev (dw_die_ref child
, dw_die_ref prev
)
5513 gcc_assert (child
->die_parent
== prev
->die_parent
);
5514 gcc_assert (prev
->die_sib
== child
);
5517 gcc_assert (child
->die_parent
->die_child
== child
);
5521 prev
->die_sib
= child
->die_sib
;
5522 if (child
->die_parent
->die_child
== child
)
5523 child
->die_parent
->die_child
= prev
;
5526 /* Remove child DIE whose die_tag is TAG. Do nothing if no child
5530 remove_child_TAG (dw_die_ref die
, enum dwarf_tag tag
)
5536 dw_die_ref prev
= c
;
5538 while (c
->die_tag
== tag
)
5540 remove_child_with_prev (c
, prev
);
5541 /* Might have removed every child. */
5542 if (c
== c
->die_sib
)
5546 } while (c
!= die
->die_child
);
5549 /* Add a CHILD_DIE as the last child of DIE. */
5552 add_child_die (dw_die_ref die
, dw_die_ref child_die
)
5554 /* FIXME this should probably be an assert. */
5555 if (! die
|| ! child_die
)
5557 gcc_assert (die
!= child_die
);
5559 child_die
->die_parent
= die
;
5562 child_die
->die_sib
= die
->die_child
->die_sib
;
5563 die
->die_child
->die_sib
= child_die
;
5566 child_die
->die_sib
= child_die
;
5567 die
->die_child
= child_die
;
5570 /* Move CHILD, which must be a child of PARENT or the DIE for which PARENT
5571 is the specification, to the end of PARENT's list of children.
5572 This is done by removing and re-adding it. */
5575 splice_child_die (dw_die_ref parent
, dw_die_ref child
)
5579 /* We want the declaration DIE from inside the class, not the
5580 specification DIE at toplevel. */
5581 if (child
->die_parent
!= parent
)
5583 dw_die_ref tmp
= get_AT_ref (child
, DW_AT_specification
);
5589 gcc_assert (child
->die_parent
== parent
5590 || (child
->die_parent
5591 == get_AT_ref (parent
, DW_AT_specification
)));
5593 for (p
= child
->die_parent
->die_child
; ; p
= p
->die_sib
)
5594 if (p
->die_sib
== child
)
5596 remove_child_with_prev (child
, p
);
5600 add_child_die (parent
, child
);
5603 /* Return a pointer to a newly created DIE node. */
5605 static inline dw_die_ref
5606 new_die (enum dwarf_tag tag_value
, dw_die_ref parent_die
, tree t
)
5608 dw_die_ref die
= ggc_alloc_cleared (sizeof (die_node
));
5610 die
->die_tag
= tag_value
;
5612 if (parent_die
!= NULL
)
5613 add_child_die (parent_die
, die
);
5616 limbo_die_node
*limbo_node
;
5618 limbo_node
= ggc_alloc_cleared (sizeof (limbo_die_node
));
5619 limbo_node
->die
= die
;
5620 limbo_node
->created_for
= t
;
5621 limbo_node
->next
= limbo_die_list
;
5622 limbo_die_list
= limbo_node
;
5628 /* Return the DIE associated with the given type specifier. */
5630 static inline dw_die_ref
5631 lookup_type_die (tree type
)
5633 return TYPE_SYMTAB_DIE (type
);
5636 /* Equate a DIE to a given type specifier. */
5639 equate_type_number_to_die (tree type
, dw_die_ref type_die
)
5641 TYPE_SYMTAB_DIE (type
) = type_die
;
5644 /* Returns a hash value for X (which really is a die_struct). */
5647 decl_die_table_hash (const void *x
)
5649 return (hashval_t
) ((const dw_die_ref
) x
)->decl_id
;
5652 /* Return nonzero if decl_id of die_struct X is the same as UID of decl *Y. */
5655 decl_die_table_eq (const void *x
, const void *y
)
5657 return (((const dw_die_ref
) x
)->decl_id
== DECL_UID ((const tree
) y
));
5660 /* Return the DIE associated with a given declaration. */
5662 static inline dw_die_ref
5663 lookup_decl_die (tree decl
)
5665 return htab_find_with_hash (decl_die_table
, decl
, DECL_UID (decl
));
5668 /* Returns a hash value for X (which really is a var_loc_list). */
5671 decl_loc_table_hash (const void *x
)
5673 return (hashval_t
) ((const var_loc_list
*) x
)->decl_id
;
5676 /* Return nonzero if decl_id of var_loc_list X is the same as
5680 decl_loc_table_eq (const void *x
, const void *y
)
5682 return (((const var_loc_list
*) x
)->decl_id
== DECL_UID ((const tree
) y
));
5685 /* Return the var_loc list associated with a given declaration. */
5687 static inline var_loc_list
*
5688 lookup_decl_loc (tree decl
)
5690 return htab_find_with_hash (decl_loc_table
, decl
, DECL_UID (decl
));
5693 /* Equate a DIE to a particular declaration. */
5696 equate_decl_number_to_die (tree decl
, dw_die_ref decl_die
)
5698 unsigned int decl_id
= DECL_UID (decl
);
5701 slot
= htab_find_slot_with_hash (decl_die_table
, decl
, decl_id
, INSERT
);
5703 decl_die
->decl_id
= decl_id
;
5706 /* Add a variable location node to the linked list for DECL. */
5709 add_var_loc_to_decl (tree decl
, struct var_loc_node
*loc
)
5711 unsigned int decl_id
= DECL_UID (decl
);
5715 slot
= htab_find_slot_with_hash (decl_loc_table
, decl
, decl_id
, INSERT
);
5718 temp
= ggc_alloc_cleared (sizeof (var_loc_list
));
5719 temp
->decl_id
= decl_id
;
5727 /* If the current location is the same as the end of the list,
5728 we have nothing to do. */
5729 if (!rtx_equal_p (NOTE_VAR_LOCATION_LOC (temp
->last
->var_loc_note
),
5730 NOTE_VAR_LOCATION_LOC (loc
->var_loc_note
)))
5732 /* Add LOC to the end of list and update LAST. */
5733 temp
->last
->next
= loc
;
5737 /* Do not add empty location to the beginning of the list. */
5738 else if (NOTE_VAR_LOCATION_LOC (loc
->var_loc_note
) != NULL_RTX
)
5745 /* Keep track of the number of spaces used to indent the
5746 output of the debugging routines that print the structure of
5747 the DIE internal representation. */
5748 static int print_indent
;
5750 /* Indent the line the number of spaces given by print_indent. */
5753 print_spaces (FILE *outfile
)
5755 fprintf (outfile
, "%*s", print_indent
, "");
5758 /* Print the information associated with a given DIE, and its children.
5759 This routine is a debugging aid only. */
5762 print_die (dw_die_ref die
, FILE *outfile
)
5768 print_spaces (outfile
);
5769 fprintf (outfile
, "DIE %4lu: %s\n",
5770 die
->die_offset
, dwarf_tag_name (die
->die_tag
));
5771 print_spaces (outfile
);
5772 fprintf (outfile
, " abbrev id: %lu", die
->die_abbrev
);
5773 fprintf (outfile
, " offset: %lu\n", die
->die_offset
);
5775 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
5777 print_spaces (outfile
);
5778 fprintf (outfile
, " %s: ", dwarf_attr_name (a
->dw_attr
));
5780 switch (AT_class (a
))
5782 case dw_val_class_addr
:
5783 fprintf (outfile
, "address");
5785 case dw_val_class_offset
:
5786 fprintf (outfile
, "offset");
5788 case dw_val_class_loc
:
5789 fprintf (outfile
, "location descriptor");
5791 case dw_val_class_loc_list
:
5792 fprintf (outfile
, "location list -> label:%s",
5793 AT_loc_list (a
)->ll_symbol
);
5795 case dw_val_class_range_list
:
5796 fprintf (outfile
, "range list");
5798 case dw_val_class_const
:
5799 fprintf (outfile
, HOST_WIDE_INT_PRINT_DEC
, AT_int (a
));
5801 case dw_val_class_unsigned_const
:
5802 fprintf (outfile
, HOST_WIDE_INT_PRINT_UNSIGNED
, AT_unsigned (a
));
5804 case dw_val_class_long_long
:
5805 fprintf (outfile
, "constant (%lu,%lu)",
5806 a
->dw_attr_val
.v
.val_long_long
.hi
,
5807 a
->dw_attr_val
.v
.val_long_long
.low
);
5809 case dw_val_class_vec
:
5810 fprintf (outfile
, "floating-point or vector constant");
5812 case dw_val_class_flag
:
5813 fprintf (outfile
, "%u", AT_flag (a
));
5815 case dw_val_class_die_ref
:
5816 if (AT_ref (a
) != NULL
)
5818 if (AT_ref (a
)->die_symbol
)
5819 fprintf (outfile
, "die -> label: %s", AT_ref (a
)->die_symbol
);
5821 fprintf (outfile
, "die -> %lu", AT_ref (a
)->die_offset
);
5824 fprintf (outfile
, "die -> <null>");
5826 case dw_val_class_lbl_id
:
5827 case dw_val_class_lineptr
:
5828 case dw_val_class_macptr
:
5829 fprintf (outfile
, "label: %s", AT_lbl (a
));
5831 case dw_val_class_str
:
5832 if (AT_string (a
) != NULL
)
5833 fprintf (outfile
, "\"%s\"", AT_string (a
));
5835 fprintf (outfile
, "<null>");
5837 case dw_val_class_file
:
5838 fprintf (outfile
, "\"%s\" (%d)", AT_file (a
)->filename
,
5839 AT_file (a
)->emitted_number
);
5845 fprintf (outfile
, "\n");
5848 if (die
->die_child
!= NULL
)
5851 FOR_EACH_CHILD (die
, c
, print_die (c
, outfile
));
5854 if (print_indent
== 0)
5855 fprintf (outfile
, "\n");
5858 /* Print the contents of the source code line number correspondence table.
5859 This routine is a debugging aid only. */
5862 print_dwarf_line_table (FILE *outfile
)
5865 dw_line_info_ref line_info
;
5867 fprintf (outfile
, "\n\nDWARF source line information\n");
5868 for (i
= 1; i
< line_info_table_in_use
; i
++)
5870 line_info
= &line_info_table
[i
];
5871 fprintf (outfile
, "%5d: %4ld %6ld\n", i
,
5872 line_info
->dw_file_num
,
5873 line_info
->dw_line_num
);
5876 fprintf (outfile
, "\n\n");
5879 /* Print the information collected for a given DIE. */
5882 debug_dwarf_die (dw_die_ref die
)
5884 print_die (die
, stderr
);
5887 /* Print all DWARF information collected for the compilation unit.
5888 This routine is a debugging aid only. */
5894 print_die (comp_unit_die
, stderr
);
5895 if (! DWARF2_ASM_LINE_DEBUG_INFO
)
5896 print_dwarf_line_table (stderr
);
5899 /* Start a new compilation unit DIE for an include file. OLD_UNIT is the CU
5900 for the enclosing include file, if any. BINCL_DIE is the DW_TAG_GNU_BINCL
5901 DIE that marks the start of the DIEs for this include file. */
5904 push_new_compile_unit (dw_die_ref old_unit
, dw_die_ref bincl_die
)
5906 const char *filename
= get_AT_string (bincl_die
, DW_AT_name
);
5907 dw_die_ref new_unit
= gen_compile_unit_die (filename
);
5909 new_unit
->die_sib
= old_unit
;
5913 /* Close an include-file CU and reopen the enclosing one. */
5916 pop_compile_unit (dw_die_ref old_unit
)
5918 dw_die_ref new_unit
= old_unit
->die_sib
;
5920 old_unit
->die_sib
= NULL
;
5924 #define CHECKSUM(FOO) md5_process_bytes (&(FOO), sizeof (FOO), ctx)
5925 #define CHECKSUM_STRING(FOO) md5_process_bytes ((FOO), strlen (FOO), ctx)
5927 /* Calculate the checksum of a location expression. */
5930 loc_checksum (dw_loc_descr_ref loc
, struct md5_ctx
*ctx
)
5932 CHECKSUM (loc
->dw_loc_opc
);
5933 CHECKSUM (loc
->dw_loc_oprnd1
);
5934 CHECKSUM (loc
->dw_loc_oprnd2
);
5937 /* Calculate the checksum of an attribute. */
5940 attr_checksum (dw_attr_ref at
, struct md5_ctx
*ctx
, int *mark
)
5942 dw_loc_descr_ref loc
;
5945 CHECKSUM (at
->dw_attr
);
5947 /* We don't care that this was compiled with a different compiler
5948 snapshot; if the output is the same, that's what matters. */
5949 if (at
->dw_attr
== DW_AT_producer
)
5952 switch (AT_class (at
))
5954 case dw_val_class_const
:
5955 CHECKSUM (at
->dw_attr_val
.v
.val_int
);
5957 case dw_val_class_unsigned_const
:
5958 CHECKSUM (at
->dw_attr_val
.v
.val_unsigned
);
5960 case dw_val_class_long_long
:
5961 CHECKSUM (at
->dw_attr_val
.v
.val_long_long
);
5963 case dw_val_class_vec
:
5964 CHECKSUM (at
->dw_attr_val
.v
.val_vec
);
5966 case dw_val_class_flag
:
5967 CHECKSUM (at
->dw_attr_val
.v
.val_flag
);
5969 case dw_val_class_str
:
5970 CHECKSUM_STRING (AT_string (at
));
5973 case dw_val_class_addr
:
5975 gcc_assert (GET_CODE (r
) == SYMBOL_REF
);
5976 CHECKSUM_STRING (XSTR (r
, 0));
5979 case dw_val_class_offset
:
5980 CHECKSUM (at
->dw_attr_val
.v
.val_offset
);
5983 case dw_val_class_loc
:
5984 for (loc
= AT_loc (at
); loc
; loc
= loc
->dw_loc_next
)
5985 loc_checksum (loc
, ctx
);
5988 case dw_val_class_die_ref
:
5989 die_checksum (AT_ref (at
), ctx
, mark
);
5992 case dw_val_class_fde_ref
:
5993 case dw_val_class_lbl_id
:
5994 case dw_val_class_lineptr
:
5995 case dw_val_class_macptr
:
5998 case dw_val_class_file
:
5999 CHECKSUM_STRING (AT_file (at
)->filename
);
6007 /* Calculate the checksum of a DIE. */
6010 die_checksum (dw_die_ref die
, struct md5_ctx
*ctx
, int *mark
)
6016 /* To avoid infinite recursion. */
6019 CHECKSUM (die
->die_mark
);
6022 die
->die_mark
= ++(*mark
);
6024 CHECKSUM (die
->die_tag
);
6026 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
6027 attr_checksum (a
, ctx
, mark
);
6029 FOR_EACH_CHILD (die
, c
, die_checksum (c
, ctx
, mark
));
6033 #undef CHECKSUM_STRING
6035 /* Do the location expressions look same? */
6037 same_loc_p (dw_loc_descr_ref loc1
, dw_loc_descr_ref loc2
, int *mark
)
6039 return loc1
->dw_loc_opc
== loc2
->dw_loc_opc
6040 && same_dw_val_p (&loc1
->dw_loc_oprnd1
, &loc2
->dw_loc_oprnd1
, mark
)
6041 && same_dw_val_p (&loc1
->dw_loc_oprnd2
, &loc2
->dw_loc_oprnd2
, mark
);
6044 /* Do the values look the same? */
6046 same_dw_val_p (dw_val_node
*v1
, dw_val_node
*v2
, int *mark
)
6048 dw_loc_descr_ref loc1
, loc2
;
6051 if (v1
->val_class
!= v2
->val_class
)
6054 switch (v1
->val_class
)
6056 case dw_val_class_const
:
6057 return v1
->v
.val_int
== v2
->v
.val_int
;
6058 case dw_val_class_unsigned_const
:
6059 return v1
->v
.val_unsigned
== v2
->v
.val_unsigned
;
6060 case dw_val_class_long_long
:
6061 return v1
->v
.val_long_long
.hi
== v2
->v
.val_long_long
.hi
6062 && v1
->v
.val_long_long
.low
== v2
->v
.val_long_long
.low
;
6063 case dw_val_class_vec
:
6064 if (v1
->v
.val_vec
.length
!= v2
->v
.val_vec
.length
6065 || v1
->v
.val_vec
.elt_size
!= v2
->v
.val_vec
.elt_size
)
6067 if (memcmp (v1
->v
.val_vec
.array
, v2
->v
.val_vec
.array
,
6068 v1
->v
.val_vec
.length
* v1
->v
.val_vec
.elt_size
))
6071 case dw_val_class_flag
:
6072 return v1
->v
.val_flag
== v2
->v
.val_flag
;
6073 case dw_val_class_str
:
6074 return !strcmp(v1
->v
.val_str
->str
, v2
->v
.val_str
->str
);
6076 case dw_val_class_addr
:
6077 r1
= v1
->v
.val_addr
;
6078 r2
= v2
->v
.val_addr
;
6079 if (GET_CODE (r1
) != GET_CODE (r2
))
6081 gcc_assert (GET_CODE (r1
) == SYMBOL_REF
);
6082 return !strcmp (XSTR (r1
, 0), XSTR (r2
, 0));
6084 case dw_val_class_offset
:
6085 return v1
->v
.val_offset
== v2
->v
.val_offset
;
6087 case dw_val_class_loc
:
6088 for (loc1
= v1
->v
.val_loc
, loc2
= v2
->v
.val_loc
;
6090 loc1
= loc1
->dw_loc_next
, loc2
= loc2
->dw_loc_next
)
6091 if (!same_loc_p (loc1
, loc2
, mark
))
6093 return !loc1
&& !loc2
;
6095 case dw_val_class_die_ref
:
6096 return same_die_p (v1
->v
.val_die_ref
.die
, v2
->v
.val_die_ref
.die
, mark
);
6098 case dw_val_class_fde_ref
:
6099 case dw_val_class_lbl_id
:
6100 case dw_val_class_lineptr
:
6101 case dw_val_class_macptr
:
6104 case dw_val_class_file
:
6105 return v1
->v
.val_file
== v2
->v
.val_file
;
6112 /* Do the attributes look the same? */
6115 same_attr_p (dw_attr_ref at1
, dw_attr_ref at2
, int *mark
)
6117 if (at1
->dw_attr
!= at2
->dw_attr
)
6120 /* We don't care that this was compiled with a different compiler
6121 snapshot; if the output is the same, that's what matters. */
6122 if (at1
->dw_attr
== DW_AT_producer
)
6125 return same_dw_val_p (&at1
->dw_attr_val
, &at2
->dw_attr_val
, mark
);
6128 /* Do the dies look the same? */
6131 same_die_p (dw_die_ref die1
, dw_die_ref die2
, int *mark
)
6137 /* To avoid infinite recursion. */
6139 return die1
->die_mark
== die2
->die_mark
;
6140 die1
->die_mark
= die2
->die_mark
= ++(*mark
);
6142 if (die1
->die_tag
!= die2
->die_tag
)
6145 if (VEC_length (dw_attr_node
, die1
->die_attr
)
6146 != VEC_length (dw_attr_node
, die2
->die_attr
))
6149 for (ix
= 0; VEC_iterate (dw_attr_node
, die1
->die_attr
, ix
, a1
); ix
++)
6150 if (!same_attr_p (a1
, VEC_index (dw_attr_node
, die2
->die_attr
, ix
), mark
))
6153 c1
= die1
->die_child
;
6154 c2
= die2
->die_child
;
6163 if (!same_die_p (c1
, c2
, mark
))
6167 if (c1
== die1
->die_child
)
6169 if (c2
== die2
->die_child
)
6179 /* Do the dies look the same? Wrapper around same_die_p. */
6182 same_die_p_wrap (dw_die_ref die1
, dw_die_ref die2
)
6185 int ret
= same_die_p (die1
, die2
, &mark
);
6187 unmark_all_dies (die1
);
6188 unmark_all_dies (die2
);
6193 /* The prefix to attach to symbols on DIEs in the current comdat debug
6195 static char *comdat_symbol_id
;
6197 /* The index of the current symbol within the current comdat CU. */
6198 static unsigned int comdat_symbol_number
;
6200 /* Calculate the MD5 checksum of the compilation unit DIE UNIT_DIE and its
6201 children, and set comdat_symbol_id accordingly. */
6204 compute_section_prefix (dw_die_ref unit_die
)
6206 const char *die_name
= get_AT_string (unit_die
, DW_AT_name
);
6207 const char *base
= die_name
? lbasename (die_name
) : "anonymous";
6208 char *name
= alloca (strlen (base
) + 64);
6211 unsigned char checksum
[16];
6214 /* Compute the checksum of the DIE, then append part of it as hex digits to
6215 the name filename of the unit. */
6217 md5_init_ctx (&ctx
);
6219 die_checksum (unit_die
, &ctx
, &mark
);
6220 unmark_all_dies (unit_die
);
6221 md5_finish_ctx (&ctx
, checksum
);
6223 sprintf (name
, "%s.", base
);
6224 clean_symbol_name (name
);
6226 p
= name
+ strlen (name
);
6227 for (i
= 0; i
< 4; i
++)
6229 sprintf (p
, "%.2x", checksum
[i
]);
6233 comdat_symbol_id
= unit_die
->die_symbol
= xstrdup (name
);
6234 comdat_symbol_number
= 0;
6237 /* Returns nonzero if DIE represents a type, in the sense of TYPE_P. */
6240 is_type_die (dw_die_ref die
)
6242 switch (die
->die_tag
)
6244 case DW_TAG_array_type
:
6245 case DW_TAG_class_type
:
6246 case DW_TAG_enumeration_type
:
6247 case DW_TAG_pointer_type
:
6248 case DW_TAG_reference_type
:
6249 case DW_TAG_string_type
:
6250 case DW_TAG_structure_type
:
6251 case DW_TAG_subroutine_type
:
6252 case DW_TAG_union_type
:
6253 case DW_TAG_ptr_to_member_type
:
6254 case DW_TAG_set_type
:
6255 case DW_TAG_subrange_type
:
6256 case DW_TAG_base_type
:
6257 case DW_TAG_const_type
:
6258 case DW_TAG_file_type
:
6259 case DW_TAG_packed_type
:
6260 case DW_TAG_volatile_type
:
6261 case DW_TAG_typedef
:
6268 /* Returns 1 iff C is the sort of DIE that should go into a COMDAT CU.
6269 Basically, we want to choose the bits that are likely to be shared between
6270 compilations (types) and leave out the bits that are specific to individual
6271 compilations (functions). */
6274 is_comdat_die (dw_die_ref c
)
6276 /* I think we want to leave base types and __vtbl_ptr_type in the main CU, as
6277 we do for stabs. The advantage is a greater likelihood of sharing between
6278 objects that don't include headers in the same order (and therefore would
6279 put the base types in a different comdat). jason 8/28/00 */
6281 if (c
->die_tag
== DW_TAG_base_type
)
6284 if (c
->die_tag
== DW_TAG_pointer_type
6285 || c
->die_tag
== DW_TAG_reference_type
6286 || c
->die_tag
== DW_TAG_const_type
6287 || c
->die_tag
== DW_TAG_volatile_type
)
6289 dw_die_ref t
= get_AT_ref (c
, DW_AT_type
);
6291 return t
? is_comdat_die (t
) : 0;
6294 return is_type_die (c
);
6297 /* Returns 1 iff C is the sort of DIE that might be referred to from another
6298 compilation unit. */
6301 is_symbol_die (dw_die_ref c
)
6303 return (is_type_die (c
)
6304 || (get_AT (c
, DW_AT_declaration
)
6305 && !get_AT (c
, DW_AT_specification
))
6306 || c
->die_tag
== DW_TAG_namespace
);
6310 gen_internal_sym (const char *prefix
)
6314 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, label_num
++);
6315 return xstrdup (buf
);
6318 /* Assign symbols to all worthy DIEs under DIE. */
6321 assign_symbol_names (dw_die_ref die
)
6325 if (is_symbol_die (die
))
6327 if (comdat_symbol_id
)
6329 char *p
= alloca (strlen (comdat_symbol_id
) + 64);
6331 sprintf (p
, "%s.%s.%x", DIE_LABEL_PREFIX
,
6332 comdat_symbol_id
, comdat_symbol_number
++);
6333 die
->die_symbol
= xstrdup (p
);
6336 die
->die_symbol
= gen_internal_sym ("LDIE");
6339 FOR_EACH_CHILD (die
, c
, assign_symbol_names (c
));
6342 struct cu_hash_table_entry
6345 unsigned min_comdat_num
, max_comdat_num
;
6346 struct cu_hash_table_entry
*next
;
6349 /* Routines to manipulate hash table of CUs. */
6351 htab_cu_hash (const void *of
)
6353 const struct cu_hash_table_entry
*entry
= of
;
6355 return htab_hash_string (entry
->cu
->die_symbol
);
6359 htab_cu_eq (const void *of1
, const void *of2
)
6361 const struct cu_hash_table_entry
*entry1
= of1
;
6362 const struct die_struct
*entry2
= of2
;
6364 return !strcmp (entry1
->cu
->die_symbol
, entry2
->die_symbol
);
6368 htab_cu_del (void *what
)
6370 struct cu_hash_table_entry
*next
, *entry
= what
;
6380 /* Check whether we have already seen this CU and set up SYM_NUM
6383 check_duplicate_cu (dw_die_ref cu
, htab_t htable
, unsigned int *sym_num
)
6385 struct cu_hash_table_entry dummy
;
6386 struct cu_hash_table_entry
**slot
, *entry
, *last
= &dummy
;
6388 dummy
.max_comdat_num
= 0;
6390 slot
= (struct cu_hash_table_entry
**)
6391 htab_find_slot_with_hash (htable
, cu
, htab_hash_string (cu
->die_symbol
),
6395 for (; entry
; last
= entry
, entry
= entry
->next
)
6397 if (same_die_p_wrap (cu
, entry
->cu
))
6403 *sym_num
= entry
->min_comdat_num
;
6407 entry
= XCNEW (struct cu_hash_table_entry
);
6409 entry
->min_comdat_num
= *sym_num
= last
->max_comdat_num
;
6410 entry
->next
= *slot
;
6416 /* Record SYM_NUM to record of CU in HTABLE. */
6418 record_comdat_symbol_number (dw_die_ref cu
, htab_t htable
, unsigned int sym_num
)
6420 struct cu_hash_table_entry
**slot
, *entry
;
6422 slot
= (struct cu_hash_table_entry
**)
6423 htab_find_slot_with_hash (htable
, cu
, htab_hash_string (cu
->die_symbol
),
6427 entry
->max_comdat_num
= sym_num
;
6430 /* Traverse the DIE (which is always comp_unit_die), and set up
6431 additional compilation units for each of the include files we see
6432 bracketed by BINCL/EINCL. */
6435 break_out_includes (dw_die_ref die
)
6438 dw_die_ref unit
= NULL
;
6439 limbo_die_node
*node
, **pnode
;
6440 htab_t cu_hash_table
;
6444 dw_die_ref prev
= c
;
6446 while (c
->die_tag
== DW_TAG_GNU_BINCL
|| c
->die_tag
== DW_TAG_GNU_EINCL
6447 || (unit
&& is_comdat_die (c
)))
6449 dw_die_ref next
= c
->die_sib
;
6451 /* This DIE is for a secondary CU; remove it from the main one. */
6452 remove_child_with_prev (c
, prev
);
6454 if (c
->die_tag
== DW_TAG_GNU_BINCL
)
6455 unit
= push_new_compile_unit (unit
, c
);
6456 else if (c
->die_tag
== DW_TAG_GNU_EINCL
)
6457 unit
= pop_compile_unit (unit
);
6459 add_child_die (unit
, c
);
6461 if (c
== die
->die_child
)
6464 } while (c
!= die
->die_child
);
6467 /* We can only use this in debugging, since the frontend doesn't check
6468 to make sure that we leave every include file we enter. */
6472 assign_symbol_names (die
);
6473 cu_hash_table
= htab_create (10, htab_cu_hash
, htab_cu_eq
, htab_cu_del
);
6474 for (node
= limbo_die_list
, pnode
= &limbo_die_list
;
6480 compute_section_prefix (node
->die
);
6481 is_dupl
= check_duplicate_cu (node
->die
, cu_hash_table
,
6482 &comdat_symbol_number
);
6483 assign_symbol_names (node
->die
);
6485 *pnode
= node
->next
;
6488 pnode
= &node
->next
;
6489 record_comdat_symbol_number (node
->die
, cu_hash_table
,
6490 comdat_symbol_number
);
6493 htab_delete (cu_hash_table
);
6496 /* Traverse the DIE and add a sibling attribute if it may have the
6497 effect of speeding up access to siblings. To save some space,
6498 avoid generating sibling attributes for DIE's without children. */
6501 add_sibling_attributes (dw_die_ref die
)
6505 if (! die
->die_child
)
6508 if (die
->die_parent
&& die
!= die
->die_parent
->die_child
)
6509 add_AT_die_ref (die
, DW_AT_sibling
, die
->die_sib
);
6511 FOR_EACH_CHILD (die
, c
, add_sibling_attributes (c
));
6514 /* Output all location lists for the DIE and its children. */
6517 output_location_lists (dw_die_ref die
)
6523 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
6524 if (AT_class (a
) == dw_val_class_loc_list
)
6525 output_loc_list (AT_loc_list (a
));
6527 FOR_EACH_CHILD (die
, c
, output_location_lists (c
));
6530 /* The format of each DIE (and its attribute value pairs) is encoded in an
6531 abbreviation table. This routine builds the abbreviation table and assigns
6532 a unique abbreviation id for each abbreviation entry. The children of each
6533 die are visited recursively. */
6536 build_abbrev_table (dw_die_ref die
)
6538 unsigned long abbrev_id
;
6539 unsigned int n_alloc
;
6544 /* Scan the DIE references, and mark as external any that refer to
6545 DIEs from other CUs (i.e. those which are not marked). */
6546 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
6547 if (AT_class (a
) == dw_val_class_die_ref
6548 && AT_ref (a
)->die_mark
== 0)
6550 gcc_assert (AT_ref (a
)->die_symbol
);
6552 set_AT_ref_external (a
, 1);
6555 for (abbrev_id
= 1; abbrev_id
< abbrev_die_table_in_use
; ++abbrev_id
)
6557 dw_die_ref abbrev
= abbrev_die_table
[abbrev_id
];
6558 dw_attr_ref die_a
, abbrev_a
;
6562 if (abbrev
->die_tag
!= die
->die_tag
)
6564 if ((abbrev
->die_child
!= NULL
) != (die
->die_child
!= NULL
))
6567 if (VEC_length (dw_attr_node
, abbrev
->die_attr
)
6568 != VEC_length (dw_attr_node
, die
->die_attr
))
6571 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, die_a
); ix
++)
6573 abbrev_a
= VEC_index (dw_attr_node
, abbrev
->die_attr
, ix
);
6574 if ((abbrev_a
->dw_attr
!= die_a
->dw_attr
)
6575 || (value_format (abbrev_a
) != value_format (die_a
)))
6585 if (abbrev_id
>= abbrev_die_table_in_use
)
6587 if (abbrev_die_table_in_use
>= abbrev_die_table_allocated
)
6589 n_alloc
= abbrev_die_table_allocated
+ ABBREV_DIE_TABLE_INCREMENT
;
6590 abbrev_die_table
= ggc_realloc (abbrev_die_table
,
6591 sizeof (dw_die_ref
) * n_alloc
);
6593 memset (&abbrev_die_table
[abbrev_die_table_allocated
], 0,
6594 (n_alloc
- abbrev_die_table_allocated
) * sizeof (dw_die_ref
));
6595 abbrev_die_table_allocated
= n_alloc
;
6598 ++abbrev_die_table_in_use
;
6599 abbrev_die_table
[abbrev_id
] = die
;
6602 die
->die_abbrev
= abbrev_id
;
6603 FOR_EACH_CHILD (die
, c
, build_abbrev_table (c
));
6606 /* Return the power-of-two number of bytes necessary to represent VALUE. */
6609 constant_size (long unsigned int value
)
6616 log
= floor_log2 (value
);
6619 log
= 1 << (floor_log2 (log
) + 1);
6624 /* Return the size of a DIE as it is represented in the
6625 .debug_info section. */
6627 static unsigned long
6628 size_of_die (dw_die_ref die
)
6630 unsigned long size
= 0;
6634 size
+= size_of_uleb128 (die
->die_abbrev
);
6635 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
6637 switch (AT_class (a
))
6639 case dw_val_class_addr
:
6640 size
+= DWARF2_ADDR_SIZE
;
6642 case dw_val_class_offset
:
6643 size
+= DWARF_OFFSET_SIZE
;
6645 case dw_val_class_loc
:
6647 unsigned long lsize
= size_of_locs (AT_loc (a
));
6650 size
+= constant_size (lsize
);
6654 case dw_val_class_loc_list
:
6655 size
+= DWARF_OFFSET_SIZE
;
6657 case dw_val_class_range_list
:
6658 size
+= DWARF_OFFSET_SIZE
;
6660 case dw_val_class_const
:
6661 size
+= size_of_sleb128 (AT_int (a
));
6663 case dw_val_class_unsigned_const
:
6664 size
+= constant_size (AT_unsigned (a
));
6666 case dw_val_class_long_long
:
6667 size
+= 1 + 2*HOST_BITS_PER_LONG
/HOST_BITS_PER_CHAR
; /* block */
6669 case dw_val_class_vec
:
6670 size
+= 1 + (a
->dw_attr_val
.v
.val_vec
.length
6671 * a
->dw_attr_val
.v
.val_vec
.elt_size
); /* block */
6673 case dw_val_class_flag
:
6676 case dw_val_class_die_ref
:
6677 if (AT_ref_external (a
))
6678 size
+= DWARF2_ADDR_SIZE
;
6680 size
+= DWARF_OFFSET_SIZE
;
6682 case dw_val_class_fde_ref
:
6683 size
+= DWARF_OFFSET_SIZE
;
6685 case dw_val_class_lbl_id
:
6686 size
+= DWARF2_ADDR_SIZE
;
6688 case dw_val_class_lineptr
:
6689 case dw_val_class_macptr
:
6690 size
+= DWARF_OFFSET_SIZE
;
6692 case dw_val_class_str
:
6693 if (AT_string_form (a
) == DW_FORM_strp
)
6694 size
+= DWARF_OFFSET_SIZE
;
6696 size
+= strlen (a
->dw_attr_val
.v
.val_str
->str
) + 1;
6698 case dw_val_class_file
:
6699 size
+= constant_size (maybe_emit_file (a
->dw_attr_val
.v
.val_file
));
6709 /* Size the debugging information associated with a given DIE. Visits the
6710 DIE's children recursively. Updates the global variable next_die_offset, on
6711 each time through. Uses the current value of next_die_offset to update the
6712 die_offset field in each DIE. */
6715 calc_die_sizes (dw_die_ref die
)
6719 die
->die_offset
= next_die_offset
;
6720 next_die_offset
+= size_of_die (die
);
6722 FOR_EACH_CHILD (die
, c
, calc_die_sizes (c
));
6724 if (die
->die_child
!= NULL
)
6725 /* Count the null byte used to terminate sibling lists. */
6726 next_die_offset
+= 1;
6729 /* Set the marks for a die and its children. We do this so
6730 that we know whether or not a reference needs to use FORM_ref_addr; only
6731 DIEs in the same CU will be marked. We used to clear out the offset
6732 and use that as the flag, but ran into ordering problems. */
6735 mark_dies (dw_die_ref die
)
6739 gcc_assert (!die
->die_mark
);
6742 FOR_EACH_CHILD (die
, c
, mark_dies (c
));
6745 /* Clear the marks for a die and its children. */
6748 unmark_dies (dw_die_ref die
)
6752 gcc_assert (die
->die_mark
);
6755 FOR_EACH_CHILD (die
, c
, unmark_dies (c
));
6758 /* Clear the marks for a die, its children and referred dies. */
6761 unmark_all_dies (dw_die_ref die
)
6771 FOR_EACH_CHILD (die
, c
, unmark_all_dies (c
));
6773 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
6774 if (AT_class (a
) == dw_val_class_die_ref
)
6775 unmark_all_dies (AT_ref (a
));
6778 /* Return the size of the .debug_pubnames or .debug_pubtypes table
6779 generated for the compilation unit. */
6781 static unsigned long
6782 size_of_pubnames (VEC (pubname_entry
, gc
) * names
)
6788 size
= DWARF_PUBNAMES_HEADER_SIZE
;
6789 for (i
= 0; VEC_iterate (pubname_entry
, names
, i
, p
); i
++)
6790 if (names
!= pubtype_table
6791 || p
->die
->die_offset
!= 0
6792 || !flag_eliminate_unused_debug_types
)
6793 size
+= strlen (p
->name
) + DWARF_OFFSET_SIZE
+ 1;
6795 size
+= DWARF_OFFSET_SIZE
;
6799 /* Return the size of the information in the .debug_aranges section. */
6801 static unsigned long
6802 size_of_aranges (void)
6806 size
= DWARF_ARANGES_HEADER_SIZE
;
6808 /* Count the address/length pair for this compilation unit. */
6809 size
+= 2 * DWARF2_ADDR_SIZE
;
6810 size
+= 2 * DWARF2_ADDR_SIZE
* arange_table_in_use
;
6812 /* Count the two zero words used to terminated the address range table. */
6813 size
+= 2 * DWARF2_ADDR_SIZE
;
6817 /* Select the encoding of an attribute value. */
6819 static enum dwarf_form
6820 value_format (dw_attr_ref a
)
6822 switch (a
->dw_attr_val
.val_class
)
6824 case dw_val_class_addr
:
6825 return DW_FORM_addr
;
6826 case dw_val_class_range_list
:
6827 case dw_val_class_offset
:
6828 case dw_val_class_loc_list
:
6829 switch (DWARF_OFFSET_SIZE
)
6832 return DW_FORM_data4
;
6834 return DW_FORM_data8
;
6838 case dw_val_class_loc
:
6839 switch (constant_size (size_of_locs (AT_loc (a
))))
6842 return DW_FORM_block1
;
6844 return DW_FORM_block2
;
6848 case dw_val_class_const
:
6849 return DW_FORM_sdata
;
6850 case dw_val_class_unsigned_const
:
6851 switch (constant_size (AT_unsigned (a
)))
6854 return DW_FORM_data1
;
6856 return DW_FORM_data2
;
6858 return DW_FORM_data4
;
6860 return DW_FORM_data8
;
6864 case dw_val_class_long_long
:
6865 return DW_FORM_block1
;
6866 case dw_val_class_vec
:
6867 return DW_FORM_block1
;
6868 case dw_val_class_flag
:
6869 return DW_FORM_flag
;
6870 case dw_val_class_die_ref
:
6871 if (AT_ref_external (a
))
6872 return DW_FORM_ref_addr
;
6875 case dw_val_class_fde_ref
:
6876 return DW_FORM_data
;
6877 case dw_val_class_lbl_id
:
6878 return DW_FORM_addr
;
6879 case dw_val_class_lineptr
:
6880 case dw_val_class_macptr
:
6881 return DW_FORM_data
;
6882 case dw_val_class_str
:
6883 return AT_string_form (a
);
6884 case dw_val_class_file
:
6885 switch (constant_size (maybe_emit_file (a
->dw_attr_val
.v
.val_file
)))
6888 return DW_FORM_data1
;
6890 return DW_FORM_data2
;
6892 return DW_FORM_data4
;
6902 /* Output the encoding of an attribute value. */
6905 output_value_format (dw_attr_ref a
)
6907 enum dwarf_form form
= value_format (a
);
6909 dw2_asm_output_data_uleb128 (form
, "(%s)", dwarf_form_name (form
));
6912 /* Output the .debug_abbrev section which defines the DIE abbreviation
6916 output_abbrev_section (void)
6918 unsigned long abbrev_id
;
6920 for (abbrev_id
= 1; abbrev_id
< abbrev_die_table_in_use
; ++abbrev_id
)
6922 dw_die_ref abbrev
= abbrev_die_table
[abbrev_id
];
6926 dw2_asm_output_data_uleb128 (abbrev_id
, "(abbrev code)");
6927 dw2_asm_output_data_uleb128 (abbrev
->die_tag
, "(TAG: %s)",
6928 dwarf_tag_name (abbrev
->die_tag
));
6930 if (abbrev
->die_child
!= NULL
)
6931 dw2_asm_output_data (1, DW_children_yes
, "DW_children_yes");
6933 dw2_asm_output_data (1, DW_children_no
, "DW_children_no");
6935 for (ix
= 0; VEC_iterate (dw_attr_node
, abbrev
->die_attr
, ix
, a_attr
);
6938 dw2_asm_output_data_uleb128 (a_attr
->dw_attr
, "(%s)",
6939 dwarf_attr_name (a_attr
->dw_attr
));
6940 output_value_format (a_attr
);
6943 dw2_asm_output_data (1, 0, NULL
);
6944 dw2_asm_output_data (1, 0, NULL
);
6947 /* Terminate the table. */
6948 dw2_asm_output_data (1, 0, NULL
);
6951 /* Output a symbol we can use to refer to this DIE from another CU. */
6954 output_die_symbol (dw_die_ref die
)
6956 char *sym
= die
->die_symbol
;
6961 if (strncmp (sym
, DIE_LABEL_PREFIX
, sizeof (DIE_LABEL_PREFIX
) - 1) == 0)
6962 /* We make these global, not weak; if the target doesn't support
6963 .linkonce, it doesn't support combining the sections, so debugging
6965 targetm
.asm_out
.globalize_label (asm_out_file
, sym
);
6967 ASM_OUTPUT_LABEL (asm_out_file
, sym
);
6970 /* Return a new location list, given the begin and end range, and the
6971 expression. gensym tells us whether to generate a new internal symbol for
6972 this location list node, which is done for the head of the list only. */
6974 static inline dw_loc_list_ref
6975 new_loc_list (dw_loc_descr_ref expr
, const char *begin
, const char *end
,
6976 const char *section
, unsigned int gensym
)
6978 dw_loc_list_ref retlist
= ggc_alloc_cleared (sizeof (dw_loc_list_node
));
6980 retlist
->begin
= begin
;
6982 retlist
->expr
= expr
;
6983 retlist
->section
= section
;
6985 retlist
->ll_symbol
= gen_internal_sym ("LLST");
6990 /* Add a location description expression to a location list. */
6993 add_loc_descr_to_loc_list (dw_loc_list_ref
*list_head
, dw_loc_descr_ref descr
,
6994 const char *begin
, const char *end
,
6995 const char *section
)
6999 /* Find the end of the chain. */
7000 for (d
= list_head
; (*d
) != NULL
; d
= &(*d
)->dw_loc_next
)
7003 /* Add a new location list node to the list. */
7004 *d
= new_loc_list (descr
, begin
, end
, section
, 0);
7008 dwarf2out_switch_text_section (void)
7014 fde
= &fde_table
[fde_table_in_use
- 1];
7015 fde
->dw_fde_switched_sections
= true;
7016 fde
->dw_fde_hot_section_label
= cfun
->hot_section_label
;
7017 fde
->dw_fde_hot_section_end_label
= cfun
->hot_section_end_label
;
7018 fde
->dw_fde_unlikely_section_label
= cfun
->cold_section_label
;
7019 fde
->dw_fde_unlikely_section_end_label
= cfun
->cold_section_end_label
;
7020 have_multiple_function_sections
= true;
7022 /* Reset the current label on switching text sections, so that we
7023 don't attempt to advance_loc4 between labels in different sections. */
7024 fde
->dw_fde_current_label
= NULL
;
7027 /* Output the location list given to us. */
7030 output_loc_list (dw_loc_list_ref list_head
)
7032 dw_loc_list_ref curr
= list_head
;
7034 ASM_OUTPUT_LABEL (asm_out_file
, list_head
->ll_symbol
);
7036 /* Walk the location list, and output each range + expression. */
7037 for (curr
= list_head
; curr
!= NULL
; curr
= curr
->dw_loc_next
)
7040 if (!have_multiple_function_sections
)
7042 dw2_asm_output_delta (DWARF2_ADDR_SIZE
, curr
->begin
, curr
->section
,
7043 "Location list begin address (%s)",
7044 list_head
->ll_symbol
);
7045 dw2_asm_output_delta (DWARF2_ADDR_SIZE
, curr
->end
, curr
->section
,
7046 "Location list end address (%s)",
7047 list_head
->ll_symbol
);
7051 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, curr
->begin
,
7052 "Location list begin address (%s)",
7053 list_head
->ll_symbol
);
7054 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, curr
->end
,
7055 "Location list end address (%s)",
7056 list_head
->ll_symbol
);
7058 size
= size_of_locs (curr
->expr
);
7060 /* Output the block length for this list of location operations. */
7061 gcc_assert (size
<= 0xffff);
7062 dw2_asm_output_data (2, size
, "%s", "Location expression size");
7064 output_loc_sequence (curr
->expr
);
7067 dw2_asm_output_data (DWARF2_ADDR_SIZE
, 0,
7068 "Location list terminator begin (%s)",
7069 list_head
->ll_symbol
);
7070 dw2_asm_output_data (DWARF2_ADDR_SIZE
, 0,
7071 "Location list terminator end (%s)",
7072 list_head
->ll_symbol
);
7075 /* Output the DIE and its attributes. Called recursively to generate
7076 the definitions of each child DIE. */
7079 output_die (dw_die_ref die
)
7086 /* If someone in another CU might refer to us, set up a symbol for
7087 them to point to. */
7088 if (die
->die_symbol
)
7089 output_die_symbol (die
);
7091 dw2_asm_output_data_uleb128 (die
->die_abbrev
, "(DIE (0x%lx) %s)",
7092 die
->die_offset
, dwarf_tag_name (die
->die_tag
));
7094 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
7096 const char *name
= dwarf_attr_name (a
->dw_attr
);
7098 switch (AT_class (a
))
7100 case dw_val_class_addr
:
7101 dw2_asm_output_addr_rtx (DWARF2_ADDR_SIZE
, AT_addr (a
), "%s", name
);
7104 case dw_val_class_offset
:
7105 dw2_asm_output_data (DWARF_OFFSET_SIZE
, a
->dw_attr_val
.v
.val_offset
,
7109 case dw_val_class_range_list
:
7111 char *p
= strchr (ranges_section_label
, '\0');
7113 sprintf (p
, "+" HOST_WIDE_INT_PRINT_HEX
,
7114 a
->dw_attr_val
.v
.val_offset
);
7115 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, ranges_section_label
,
7116 debug_ranges_section
, "%s", name
);
7121 case dw_val_class_loc
:
7122 size
= size_of_locs (AT_loc (a
));
7124 /* Output the block length for this list of location operations. */
7125 dw2_asm_output_data (constant_size (size
), size
, "%s", name
);
7127 output_loc_sequence (AT_loc (a
));
7130 case dw_val_class_const
:
7131 /* ??? It would be slightly more efficient to use a scheme like is
7132 used for unsigned constants below, but gdb 4.x does not sign
7133 extend. Gdb 5.x does sign extend. */
7134 dw2_asm_output_data_sleb128 (AT_int (a
), "%s", name
);
7137 case dw_val_class_unsigned_const
:
7138 dw2_asm_output_data (constant_size (AT_unsigned (a
)),
7139 AT_unsigned (a
), "%s", name
);
7142 case dw_val_class_long_long
:
7144 unsigned HOST_WIDE_INT first
, second
;
7146 dw2_asm_output_data (1,
7147 2 * HOST_BITS_PER_LONG
/ HOST_BITS_PER_CHAR
,
7150 if (WORDS_BIG_ENDIAN
)
7152 first
= a
->dw_attr_val
.v
.val_long_long
.hi
;
7153 second
= a
->dw_attr_val
.v
.val_long_long
.low
;
7157 first
= a
->dw_attr_val
.v
.val_long_long
.low
;
7158 second
= a
->dw_attr_val
.v
.val_long_long
.hi
;
7161 dw2_asm_output_data (HOST_BITS_PER_LONG
/ HOST_BITS_PER_CHAR
,
7162 first
, "long long constant");
7163 dw2_asm_output_data (HOST_BITS_PER_LONG
/ HOST_BITS_PER_CHAR
,
7168 case dw_val_class_vec
:
7170 unsigned int elt_size
= a
->dw_attr_val
.v
.val_vec
.elt_size
;
7171 unsigned int len
= a
->dw_attr_val
.v
.val_vec
.length
;
7175 dw2_asm_output_data (1, len
* elt_size
, "%s", name
);
7176 if (elt_size
> sizeof (HOST_WIDE_INT
))
7181 for (i
= 0, p
= a
->dw_attr_val
.v
.val_vec
.array
;
7184 dw2_asm_output_data (elt_size
, extract_int (p
, elt_size
),
7185 "fp or vector constant word %u", i
);
7189 case dw_val_class_flag
:
7190 dw2_asm_output_data (1, AT_flag (a
), "%s", name
);
7193 case dw_val_class_loc_list
:
7195 char *sym
= AT_loc_list (a
)->ll_symbol
;
7198 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, sym
, debug_loc_section
,
7203 case dw_val_class_die_ref
:
7204 if (AT_ref_external (a
))
7206 char *sym
= AT_ref (a
)->die_symbol
;
7209 dw2_asm_output_offset (DWARF2_ADDR_SIZE
, sym
, debug_info_section
,
7214 gcc_assert (AT_ref (a
)->die_offset
);
7215 dw2_asm_output_data (DWARF_OFFSET_SIZE
, AT_ref (a
)->die_offset
,
7220 case dw_val_class_fde_ref
:
7224 ASM_GENERATE_INTERNAL_LABEL (l1
, FDE_LABEL
,
7225 a
->dw_attr_val
.v
.val_fde_index
* 2);
7226 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, l1
, debug_frame_section
,
7231 case dw_val_class_lbl_id
:
7232 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, AT_lbl (a
), "%s", name
);
7235 case dw_val_class_lineptr
:
7236 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, AT_lbl (a
),
7237 debug_line_section
, "%s", name
);
7240 case dw_val_class_macptr
:
7241 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, AT_lbl (a
),
7242 debug_macinfo_section
, "%s", name
);
7245 case dw_val_class_str
:
7246 if (AT_string_form (a
) == DW_FORM_strp
)
7247 dw2_asm_output_offset (DWARF_OFFSET_SIZE
,
7248 a
->dw_attr_val
.v
.val_str
->label
,
7250 "%s: \"%s\"", name
, AT_string (a
));
7252 dw2_asm_output_nstring (AT_string (a
), -1, "%s", name
);
7255 case dw_val_class_file
:
7257 int f
= maybe_emit_file (a
->dw_attr_val
.v
.val_file
);
7259 dw2_asm_output_data (constant_size (f
), f
, "%s (%s)", name
,
7260 a
->dw_attr_val
.v
.val_file
->filename
);
7269 FOR_EACH_CHILD (die
, c
, output_die (c
));
7271 /* Add null byte to terminate sibling list. */
7272 if (die
->die_child
!= NULL
)
7273 dw2_asm_output_data (1, 0, "end of children of DIE 0x%lx",
7277 /* Output the compilation unit that appears at the beginning of the
7278 .debug_info section, and precedes the DIE descriptions. */
7281 output_compilation_unit_header (void)
7283 if (DWARF_INITIAL_LENGTH_SIZE
- DWARF_OFFSET_SIZE
== 4)
7284 dw2_asm_output_data (4, 0xffffffff,
7285 "Initial length escape value indicating 64-bit DWARF extension");
7286 dw2_asm_output_data (DWARF_OFFSET_SIZE
,
7287 next_die_offset
- DWARF_INITIAL_LENGTH_SIZE
,
7288 "Length of Compilation Unit Info");
7289 dw2_asm_output_data (2, DWARF_VERSION
, "DWARF version number");
7290 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, abbrev_section_label
,
7291 debug_abbrev_section
,
7292 "Offset Into Abbrev. Section");
7293 dw2_asm_output_data (1, DWARF2_ADDR_SIZE
, "Pointer Size (in bytes)");
7296 /* Output the compilation unit DIE and its children. */
7299 output_comp_unit (dw_die_ref die
, int output_if_empty
)
7301 const char *secname
;
7304 /* Unless we are outputting main CU, we may throw away empty ones. */
7305 if (!output_if_empty
&& die
->die_child
== NULL
)
7308 /* Even if there are no children of this DIE, we must output the information
7309 about the compilation unit. Otherwise, on an empty translation unit, we
7310 will generate a present, but empty, .debug_info section. IRIX 6.5 `nm'
7311 will then complain when examining the file. First mark all the DIEs in
7312 this CU so we know which get local refs. */
7315 build_abbrev_table (die
);
7317 /* Initialize the beginning DIE offset - and calculate sizes/offsets. */
7318 next_die_offset
= DWARF_COMPILE_UNIT_HEADER_SIZE
;
7319 calc_die_sizes (die
);
7321 oldsym
= die
->die_symbol
;
7324 tmp
= alloca (strlen (oldsym
) + 24);
7326 sprintf (tmp
, ".gnu.linkonce.wi.%s", oldsym
);
7328 die
->die_symbol
= NULL
;
7329 switch_to_section (get_section (secname
, SECTION_DEBUG
, NULL
));
7332 switch_to_section (debug_info_section
);
7334 /* Output debugging information. */
7335 output_compilation_unit_header ();
7338 /* Leave the marks on the main CU, so we can check them in
7343 die
->die_symbol
= oldsym
;
7347 /* Return the DWARF2/3 pubname associated with a decl. */
7350 dwarf2_name (tree decl
, int scope
)
7352 return lang_hooks
.dwarf_name (decl
, scope
? 1 : 0);
7355 /* Add a new entry to .debug_pubnames if appropriate. */
7358 add_pubname (tree decl
, dw_die_ref die
)
7362 if (! TREE_PUBLIC (decl
))
7366 e
.name
= xstrdup (dwarf2_name (decl
, 1));
7367 VEC_safe_push (pubname_entry
, gc
, pubname_table
, &e
);
7370 /* Add a new entry to .debug_pubtypes if appropriate. */
7373 add_pubtype (tree decl
, dw_die_ref die
)
7378 if ((TREE_PUBLIC (decl
)
7379 || die
->die_parent
== comp_unit_die
)
7380 && (die
->die_tag
== DW_TAG_typedef
|| COMPLETE_TYPE_P (decl
)))
7385 if (TYPE_NAME (decl
))
7387 if (TREE_CODE (TYPE_NAME (decl
)) == IDENTIFIER_NODE
)
7388 e
.name
= IDENTIFIER_POINTER (TYPE_NAME (decl
));
7389 else if (TREE_CODE (TYPE_NAME (decl
)) == TYPE_DECL
7390 && DECL_NAME (TYPE_NAME (decl
)))
7391 e
.name
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (decl
)));
7393 e
.name
= xstrdup ((const char *) get_AT_string (die
, DW_AT_name
));
7397 e
.name
= xstrdup (dwarf2_name (decl
, 1));
7399 /* If we don't have a name for the type, there's no point in adding
7401 if (e
.name
&& e
.name
[0] != '\0')
7402 VEC_safe_push (pubname_entry
, gc
, pubtype_table
, &e
);
7406 /* Output the public names table used to speed up access to externally
7407 visible names; or the public types table used to find type definitions. */
7410 output_pubnames (VEC (pubname_entry
, gc
) * names
)
7413 unsigned long pubnames_length
= size_of_pubnames (names
);
7416 if (DWARF_INITIAL_LENGTH_SIZE
- DWARF_OFFSET_SIZE
== 4)
7417 dw2_asm_output_data (4, 0xffffffff,
7418 "Initial length escape value indicating 64-bit DWARF extension");
7419 if (names
== pubname_table
)
7420 dw2_asm_output_data (DWARF_OFFSET_SIZE
, pubnames_length
,
7421 "Length of Public Names Info");
7423 dw2_asm_output_data (DWARF_OFFSET_SIZE
, pubnames_length
,
7424 "Length of Public Type Names Info");
7425 dw2_asm_output_data (2, DWARF_VERSION
, "DWARF Version");
7426 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, debug_info_section_label
,
7428 "Offset of Compilation Unit Info");
7429 dw2_asm_output_data (DWARF_OFFSET_SIZE
, next_die_offset
,
7430 "Compilation Unit Length");
7432 for (i
= 0; VEC_iterate (pubname_entry
, names
, i
, pub
); i
++)
7434 /* We shouldn't see pubnames for DIEs outside of the main CU. */
7435 if (names
== pubname_table
)
7436 gcc_assert (pub
->die
->die_mark
);
7438 if (names
!= pubtype_table
7439 || pub
->die
->die_offset
!= 0
7440 || !flag_eliminate_unused_debug_types
)
7442 dw2_asm_output_data (DWARF_OFFSET_SIZE
, pub
->die
->die_offset
,
7445 dw2_asm_output_nstring (pub
->name
, -1, "external name");
7449 dw2_asm_output_data (DWARF_OFFSET_SIZE
, 0, NULL
);
7452 /* Add a new entry to .debug_aranges if appropriate. */
7455 add_arange (tree decl
, dw_die_ref die
)
7457 if (! DECL_SECTION_NAME (decl
))
7460 if (arange_table_in_use
== arange_table_allocated
)
7462 arange_table_allocated
+= ARANGE_TABLE_INCREMENT
;
7463 arange_table
= ggc_realloc (arange_table
,
7464 (arange_table_allocated
7465 * sizeof (dw_die_ref
)));
7466 memset (arange_table
+ arange_table_in_use
, 0,
7467 ARANGE_TABLE_INCREMENT
* sizeof (dw_die_ref
));
7470 arange_table
[arange_table_in_use
++] = die
;
7473 /* Output the information that goes into the .debug_aranges table.
7474 Namely, define the beginning and ending address range of the
7475 text section generated for this compilation unit. */
7478 output_aranges (void)
7481 unsigned long aranges_length
= size_of_aranges ();
7483 if (DWARF_INITIAL_LENGTH_SIZE
- DWARF_OFFSET_SIZE
== 4)
7484 dw2_asm_output_data (4, 0xffffffff,
7485 "Initial length escape value indicating 64-bit DWARF extension");
7486 dw2_asm_output_data (DWARF_OFFSET_SIZE
, aranges_length
,
7487 "Length of Address Ranges Info");
7488 dw2_asm_output_data (2, DWARF_VERSION
, "DWARF Version");
7489 dw2_asm_output_offset (DWARF_OFFSET_SIZE
, debug_info_section_label
,
7491 "Offset of Compilation Unit Info");
7492 dw2_asm_output_data (1, DWARF2_ADDR_SIZE
, "Size of Address");
7493 dw2_asm_output_data (1, 0, "Size of Segment Descriptor");
7495 /* We need to align to twice the pointer size here. */
7496 if (DWARF_ARANGES_PAD_SIZE
)
7498 /* Pad using a 2 byte words so that padding is correct for any
7500 dw2_asm_output_data (2, 0, "Pad to %d byte boundary",
7501 2 * DWARF2_ADDR_SIZE
);
7502 for (i
= 2; i
< (unsigned) DWARF_ARANGES_PAD_SIZE
; i
+= 2)
7503 dw2_asm_output_data (2, 0, NULL
);
7506 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, text_section_label
, "Address");
7507 dw2_asm_output_delta (DWARF2_ADDR_SIZE
, text_end_label
,
7508 text_section_label
, "Length");
7509 if (flag_reorder_blocks_and_partition
)
7511 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, cold_text_section_label
,
7513 dw2_asm_output_delta (DWARF2_ADDR_SIZE
, cold_end_label
,
7514 cold_text_section_label
, "Length");
7517 for (i
= 0; i
< arange_table_in_use
; i
++)
7519 dw_die_ref die
= arange_table
[i
];
7521 /* We shouldn't see aranges for DIEs outside of the main CU. */
7522 gcc_assert (die
->die_mark
);
7524 if (die
->die_tag
== DW_TAG_subprogram
)
7526 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, get_AT_low_pc (die
),
7528 dw2_asm_output_delta (DWARF2_ADDR_SIZE
, get_AT_hi_pc (die
),
7529 get_AT_low_pc (die
), "Length");
7533 /* A static variable; extract the symbol from DW_AT_location.
7534 Note that this code isn't currently hit, as we only emit
7535 aranges for functions (jason 9/23/99). */
7536 dw_attr_ref a
= get_AT (die
, DW_AT_location
);
7537 dw_loc_descr_ref loc
;
7539 gcc_assert (a
&& AT_class (a
) == dw_val_class_loc
);
7542 gcc_assert (loc
->dw_loc_opc
== DW_OP_addr
);
7544 dw2_asm_output_addr_rtx (DWARF2_ADDR_SIZE
,
7545 loc
->dw_loc_oprnd1
.v
.val_addr
, "Address");
7546 dw2_asm_output_data (DWARF2_ADDR_SIZE
,
7547 get_AT_unsigned (die
, DW_AT_byte_size
),
7552 /* Output the terminator words. */
7553 dw2_asm_output_data (DWARF2_ADDR_SIZE
, 0, NULL
);
7554 dw2_asm_output_data (DWARF2_ADDR_SIZE
, 0, NULL
);
7557 /* Add a new entry to .debug_ranges. Return the offset at which it
7561 add_ranges (tree block
)
7563 unsigned int in_use
= ranges_table_in_use
;
7565 if (in_use
== ranges_table_allocated
)
7567 ranges_table_allocated
+= RANGES_TABLE_INCREMENT
;
7569 = ggc_realloc (ranges_table
, (ranges_table_allocated
7570 * sizeof (struct dw_ranges_struct
)));
7571 memset (ranges_table
+ ranges_table_in_use
, 0,
7572 RANGES_TABLE_INCREMENT
* sizeof (struct dw_ranges_struct
));
7575 ranges_table
[in_use
].block_num
= (block
? BLOCK_NUMBER (block
) : 0);
7576 ranges_table_in_use
= in_use
+ 1;
7578 return in_use
* 2 * DWARF2_ADDR_SIZE
;
7582 output_ranges (void)
7585 static const char *const start_fmt
= "Offset 0x%x";
7586 const char *fmt
= start_fmt
;
7588 for (i
= 0; i
< ranges_table_in_use
; i
++)
7590 int block_num
= ranges_table
[i
].block_num
;
7594 char blabel
[MAX_ARTIFICIAL_LABEL_BYTES
];
7595 char elabel
[MAX_ARTIFICIAL_LABEL_BYTES
];
7597 ASM_GENERATE_INTERNAL_LABEL (blabel
, BLOCK_BEGIN_LABEL
, block_num
);
7598 ASM_GENERATE_INTERNAL_LABEL (elabel
, BLOCK_END_LABEL
, block_num
);
7600 /* If all code is in the text section, then the compilation
7601 unit base address defaults to DW_AT_low_pc, which is the
7602 base of the text section. */
7603 if (!have_multiple_function_sections
)
7605 dw2_asm_output_delta (DWARF2_ADDR_SIZE
, blabel
,
7607 fmt
, i
* 2 * DWARF2_ADDR_SIZE
);
7608 dw2_asm_output_delta (DWARF2_ADDR_SIZE
, elabel
,
7609 text_section_label
, NULL
);
7612 /* Otherwise, we add a DW_AT_entry_pc attribute to force the
7613 compilation unit base address to zero, which allows us to
7614 use absolute addresses, and not worry about whether the
7615 target supports cross-section arithmetic. */
7618 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, blabel
,
7619 fmt
, i
* 2 * DWARF2_ADDR_SIZE
);
7620 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, elabel
, NULL
);
7627 dw2_asm_output_data (DWARF2_ADDR_SIZE
, 0, NULL
);
7628 dw2_asm_output_data (DWARF2_ADDR_SIZE
, 0, NULL
);
7634 /* Data structure containing information about input files. */
7637 const char *path
; /* Complete file name. */
7638 const char *fname
; /* File name part. */
7639 int length
; /* Length of entire string. */
7640 struct dwarf_file_data
* file_idx
; /* Index in input file table. */
7641 int dir_idx
; /* Index in directory table. */
7644 /* Data structure containing information about directories with source
7648 const char *path
; /* Path including directory name. */
7649 int length
; /* Path length. */
7650 int prefix
; /* Index of directory entry which is a prefix. */
7651 int count
; /* Number of files in this directory. */
7652 int dir_idx
; /* Index of directory used as base. */
7655 /* Callback function for file_info comparison. We sort by looking at
7656 the directories in the path. */
7659 file_info_cmp (const void *p1
, const void *p2
)
7661 const struct file_info
*s1
= p1
;
7662 const struct file_info
*s2
= p2
;
7666 /* Take care of file names without directories. We need to make sure that
7667 we return consistent values to qsort since some will get confused if
7668 we return the same value when identical operands are passed in opposite
7669 orders. So if neither has a directory, return 0 and otherwise return
7670 1 or -1 depending on which one has the directory. */
7671 if ((s1
->path
== s1
->fname
|| s2
->path
== s2
->fname
))
7672 return (s2
->path
== s2
->fname
) - (s1
->path
== s1
->fname
);
7674 cp1
= (unsigned char *) s1
->path
;
7675 cp2
= (unsigned char *) s2
->path
;
7681 /* Reached the end of the first path? If so, handle like above. */
7682 if ((cp1
== (unsigned char *) s1
->fname
)
7683 || (cp2
== (unsigned char *) s2
->fname
))
7684 return ((cp2
== (unsigned char *) s2
->fname
)
7685 - (cp1
== (unsigned char *) s1
->fname
));
7687 /* Character of current path component the same? */
7688 else if (*cp1
!= *cp2
)
7693 struct file_name_acquire_data
7695 struct file_info
*files
;
7700 /* Traversal function for the hash table. */
7703 file_name_acquire (void ** slot
, void *data
)
7705 struct file_name_acquire_data
*fnad
= data
;
7706 struct dwarf_file_data
*d
= *slot
;
7707 struct file_info
*fi
;
7710 gcc_assert (fnad
->max_files
>= d
->emitted_number
);
7712 if (! d
->emitted_number
)
7715 gcc_assert (fnad
->max_files
!= fnad
->used_files
);
7717 fi
= fnad
->files
+ fnad
->used_files
++;
7719 /* Skip all leading "./". */
7721 while (f
[0] == '.' && IS_DIR_SEPARATOR (f
[1]))
7724 /* Create a new array entry. */
7726 fi
->length
= strlen (f
);
7729 /* Search for the file name part. */
7730 f
= strrchr (f
, DIR_SEPARATOR
);
7731 #if defined (DIR_SEPARATOR_2)
7733 char *g
= strrchr (fi
->path
, DIR_SEPARATOR_2
);
7737 if (f
== NULL
|| f
< g
)
7743 fi
->fname
= f
== NULL
? fi
->path
: f
+ 1;
7747 /* Output the directory table and the file name table. We try to minimize
7748 the total amount of memory needed. A heuristic is used to avoid large
7749 slowdowns with many input files. */
7752 output_file_names (void)
7754 struct file_name_acquire_data fnad
;
7756 struct file_info
*files
;
7757 struct dir_info
*dirs
;
7766 if (!last_emitted_file
)
7768 dw2_asm_output_data (1, 0, "End directory table");
7769 dw2_asm_output_data (1, 0, "End file name table");
7773 numfiles
= last_emitted_file
->emitted_number
;
7775 /* Allocate the various arrays we need. */
7776 files
= alloca (numfiles
* sizeof (struct file_info
));
7777 dirs
= alloca (numfiles
* sizeof (struct dir_info
));
7780 fnad
.used_files
= 0;
7781 fnad
.max_files
= numfiles
;
7782 htab_traverse (file_table
, file_name_acquire
, &fnad
);
7783 gcc_assert (fnad
.used_files
== fnad
.max_files
);
7785 qsort (files
, numfiles
, sizeof (files
[0]), file_info_cmp
);
7787 /* Find all the different directories used. */
7788 dirs
[0].path
= files
[0].path
;
7789 dirs
[0].length
= files
[0].fname
- files
[0].path
;
7790 dirs
[0].prefix
= -1;
7792 dirs
[0].dir_idx
= 0;
7793 files
[0].dir_idx
= 0;
7796 for (i
= 1; i
< numfiles
; i
++)
7797 if (files
[i
].fname
- files
[i
].path
== dirs
[ndirs
- 1].length
7798 && memcmp (dirs
[ndirs
- 1].path
, files
[i
].path
,
7799 dirs
[ndirs
- 1].length
) == 0)
7801 /* Same directory as last entry. */
7802 files
[i
].dir_idx
= ndirs
- 1;
7803 ++dirs
[ndirs
- 1].count
;
7809 /* This is a new directory. */
7810 dirs
[ndirs
].path
= files
[i
].path
;
7811 dirs
[ndirs
].length
= files
[i
].fname
- files
[i
].path
;
7812 dirs
[ndirs
].count
= 1;
7813 dirs
[ndirs
].dir_idx
= ndirs
;
7814 files
[i
].dir_idx
= ndirs
;
7816 /* Search for a prefix. */
7817 dirs
[ndirs
].prefix
= -1;
7818 for (j
= 0; j
< ndirs
; j
++)
7819 if (dirs
[j
].length
< dirs
[ndirs
].length
7820 && dirs
[j
].length
> 1
7821 && (dirs
[ndirs
].prefix
== -1
7822 || dirs
[j
].length
> dirs
[dirs
[ndirs
].prefix
].length
)
7823 && memcmp (dirs
[j
].path
, dirs
[ndirs
].path
, dirs
[j
].length
) == 0)
7824 dirs
[ndirs
].prefix
= j
;
7829 /* Now to the actual work. We have to find a subset of the directories which
7830 allow expressing the file name using references to the directory table
7831 with the least amount of characters. We do not do an exhaustive search
7832 where we would have to check out every combination of every single
7833 possible prefix. Instead we use a heuristic which provides nearly optimal
7834 results in most cases and never is much off. */
7835 saved
= alloca (ndirs
* sizeof (int));
7836 savehere
= alloca (ndirs
* sizeof (int));
7838 memset (saved
, '\0', ndirs
* sizeof (saved
[0]));
7839 for (i
= 0; i
< ndirs
; i
++)
7844 /* We can always save some space for the current directory. But this
7845 does not mean it will be enough to justify adding the directory. */
7846 savehere
[i
] = dirs
[i
].length
;
7847 total
= (savehere
[i
] - saved
[i
]) * dirs
[i
].count
;
7849 for (j
= i
+ 1; j
< ndirs
; j
++)
7852 if (saved
[j
] < dirs
[i
].length
)
7854 /* Determine whether the dirs[i] path is a prefix of the
7859 while (k
!= -1 && k
!= (int) i
)
7864 /* Yes it is. We can possibly save some memory by
7865 writing the filenames in dirs[j] relative to
7867 savehere
[j
] = dirs
[i
].length
;
7868 total
+= (savehere
[j
] - saved
[j
]) * dirs
[j
].count
;
7873 /* Check whether we can save enough to justify adding the dirs[i]
7875 if (total
> dirs
[i
].length
+ 1)
7877 /* It's worthwhile adding. */
7878 for (j
= i
; j
< ndirs
; j
++)
7879 if (savehere
[j
] > 0)
7881 /* Remember how much we saved for this directory so far. */
7882 saved
[j
] = savehere
[j
];
7884 /* Remember the prefix directory. */
7885 dirs
[j
].dir_idx
= i
;
7890 /* Emit the directory name table. */
7892 idx_offset
= dirs
[0].length
> 0 ? 1 : 0;
7893 for (i
= 1 - idx_offset
; i
< ndirs
; i
++)
7894 dw2_asm_output_nstring (dirs
[i
].path
, dirs
[i
].length
- 1,
7895 "Directory Entry: 0x%x", i
+ idx_offset
);
7897 dw2_asm_output_data (1, 0, "End directory table");
7899 /* We have to emit them in the order of emitted_number since that's
7900 used in the debug info generation. To do this efficiently we
7901 generate a back-mapping of the indices first. */
7902 backmap
= alloca (numfiles
* sizeof (int));
7903 for (i
= 0; i
< numfiles
; i
++)
7904 backmap
[files
[i
].file_idx
->emitted_number
- 1] = i
;
7906 /* Now write all the file names. */
7907 for (i
= 0; i
< numfiles
; i
++)
7909 int file_idx
= backmap
[i
];
7910 int dir_idx
= dirs
[files
[file_idx
].dir_idx
].dir_idx
;
7912 dw2_asm_output_nstring (files
[file_idx
].path
+ dirs
[dir_idx
].length
, -1,
7913 "File Entry: 0x%x", (unsigned) i
+ 1);
7915 /* Include directory index. */
7916 dw2_asm_output_data_uleb128 (dir_idx
+ idx_offset
, NULL
);
7918 /* Modification time. */
7919 dw2_asm_output_data_uleb128 (0, NULL
);
7921 /* File length in bytes. */
7922 dw2_asm_output_data_uleb128 (0, NULL
);
7925 dw2_asm_output_data (1, 0, "End file name table");
7929 /* Output the source line number correspondence information. This
7930 information goes into the .debug_line section. */
7933 output_line_info (void)
7935 char l1
[20], l2
[20], p1
[20], p2
[20];
7936 char line_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
7937 char prev_line_label
[MAX_ARTIFICIAL_LABEL_BYTES
];
7940 unsigned long lt_index
;
7941 unsigned long current_line
;
7944 unsigned long current_file
;
7945 unsigned long function
;
7947 ASM_GENERATE_INTERNAL_LABEL (l1
, LINE_NUMBER_BEGIN_LABEL
, 0);
7948 ASM_GENERATE_INTERNAL_LABEL (l2
, LINE_NUMBER_END_LABEL
, 0);
7949 ASM_GENERATE_INTERNAL_LABEL (p1
, LN_PROLOG_AS_LABEL
, 0);
7950 ASM_GENERATE_INTERNAL_LABEL (p2
, LN_PROLOG_END_LABEL
, 0);
7952 if (DWARF_INITIAL_LENGTH_SIZE
- DWARF_OFFSET_SIZE
== 4)
7953 dw2_asm_output_data (4, 0xffffffff,
7954 "Initial length escape value indicating 64-bit DWARF extension");
7955 dw2_asm_output_delta (DWARF_OFFSET_SIZE
, l2
, l1
,
7956 "Length of Source Line Info");
7957 ASM_OUTPUT_LABEL (asm_out_file
, l1
);
7959 dw2_asm_output_data (2, DWARF_VERSION
, "DWARF Version");
7960 dw2_asm_output_delta (DWARF_OFFSET_SIZE
, p2
, p1
, "Prolog Length");
7961 ASM_OUTPUT_LABEL (asm_out_file
, p1
);
7963 /* Define the architecture-dependent minimum instruction length (in
7964 bytes). In this implementation of DWARF, this field is used for
7965 information purposes only. Since GCC generates assembly language,
7966 we have no a priori knowledge of how many instruction bytes are
7967 generated for each source line, and therefore can use only the
7968 DW_LNE_set_address and DW_LNS_fixed_advance_pc line information
7969 commands. Accordingly, we fix this as `1', which is "correct
7970 enough" for all architectures, and don't let the target override. */
7971 dw2_asm_output_data (1, 1,
7972 "Minimum Instruction Length");
7974 dw2_asm_output_data (1, DWARF_LINE_DEFAULT_IS_STMT_START
,
7975 "Default is_stmt_start flag");
7976 dw2_asm_output_data (1, DWARF_LINE_BASE
,
7977 "Line Base Value (Special Opcodes)");
7978 dw2_asm_output_data (1, DWARF_LINE_RANGE
,
7979 "Line Range Value (Special Opcodes)");
7980 dw2_asm_output_data (1, DWARF_LINE_OPCODE_BASE
,
7981 "Special Opcode Base");
7983 for (opc
= 1; opc
< DWARF_LINE_OPCODE_BASE
; opc
++)
7987 case DW_LNS_advance_pc
:
7988 case DW_LNS_advance_line
:
7989 case DW_LNS_set_file
:
7990 case DW_LNS_set_column
:
7991 case DW_LNS_fixed_advance_pc
:
7999 dw2_asm_output_data (1, n_op_args
, "opcode: 0x%x has %d args",
8003 /* Write out the information about the files we use. */
8004 output_file_names ();
8005 ASM_OUTPUT_LABEL (asm_out_file
, p2
);
8007 /* We used to set the address register to the first location in the text
8008 section here, but that didn't accomplish anything since we already
8009 have a line note for the opening brace of the first function. */
8011 /* Generate the line number to PC correspondence table, encoded as
8012 a series of state machine operations. */
8016 if (cfun
&& in_cold_section_p
)
8017 strcpy (prev_line_label
, cfun
->cold_section_label
);
8019 strcpy (prev_line_label
, text_section_label
);
8020 for (lt_index
= 1; lt_index
< line_info_table_in_use
; ++lt_index
)
8022 dw_line_info_ref line_info
= &line_info_table
[lt_index
];
8025 /* Disable this optimization for now; GDB wants to see two line notes
8026 at the beginning of a function so it can find the end of the
8029 /* Don't emit anything for redundant notes. Just updating the
8030 address doesn't accomplish anything, because we already assume
8031 that anything after the last address is this line. */
8032 if (line_info
->dw_line_num
== current_line
8033 && line_info
->dw_file_num
== current_file
)
8037 /* Emit debug info for the address of the current line.
8039 Unfortunately, we have little choice here currently, and must always
8040 use the most general form. GCC does not know the address delta
8041 itself, so we can't use DW_LNS_advance_pc. Many ports do have length
8042 attributes which will give an upper bound on the address range. We
8043 could perhaps use length attributes to determine when it is safe to
8044 use DW_LNS_fixed_advance_pc. */
8046 ASM_GENERATE_INTERNAL_LABEL (line_label
, LINE_CODE_LABEL
, lt_index
);
8049 /* This can handle deltas up to 0xffff. This takes 3 bytes. */
8050 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc
,
8051 "DW_LNS_fixed_advance_pc");
8052 dw2_asm_output_delta (2, line_label
, prev_line_label
, NULL
);
8056 /* This can handle any delta. This takes
8057 4+DWARF2_ADDR_SIZE bytes. */
8058 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
8059 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE
, NULL
);
8060 dw2_asm_output_data (1, DW_LNE_set_address
, NULL
);
8061 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, line_label
, NULL
);
8064 strcpy (prev_line_label
, line_label
);
8066 /* Emit debug info for the source file of the current line, if
8067 different from the previous line. */
8068 if (line_info
->dw_file_num
!= current_file
)
8070 current_file
= line_info
->dw_file_num
;
8071 dw2_asm_output_data (1, DW_LNS_set_file
, "DW_LNS_set_file");
8072 dw2_asm_output_data_uleb128 (current_file
, "%lu", current_file
);
8075 /* Emit debug info for the current line number, choosing the encoding
8076 that uses the least amount of space. */
8077 if (line_info
->dw_line_num
!= current_line
)
8079 line_offset
= line_info
->dw_line_num
- current_line
;
8080 line_delta
= line_offset
- DWARF_LINE_BASE
;
8081 current_line
= line_info
->dw_line_num
;
8082 if (line_delta
>= 0 && line_delta
< (DWARF_LINE_RANGE
- 1))
8083 /* This can handle deltas from -10 to 234, using the current
8084 definitions of DWARF_LINE_BASE and DWARF_LINE_RANGE. This
8086 dw2_asm_output_data (1, DWARF_LINE_OPCODE_BASE
+ line_delta
,
8087 "line %lu", current_line
);
8090 /* This can handle any delta. This takes at least 4 bytes,
8091 depending on the value being encoded. */
8092 dw2_asm_output_data (1, DW_LNS_advance_line
,
8093 "advance to line %lu", current_line
);
8094 dw2_asm_output_data_sleb128 (line_offset
, NULL
);
8095 dw2_asm_output_data (1, DW_LNS_copy
, "DW_LNS_copy");
8099 /* We still need to start a new row, so output a copy insn. */
8100 dw2_asm_output_data (1, DW_LNS_copy
, "DW_LNS_copy");
8103 /* Emit debug info for the address of the end of the function. */
8106 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc
,
8107 "DW_LNS_fixed_advance_pc");
8108 dw2_asm_output_delta (2, text_end_label
, prev_line_label
, NULL
);
8112 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
8113 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE
, NULL
);
8114 dw2_asm_output_data (1, DW_LNE_set_address
, NULL
);
8115 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, text_end_label
, NULL
);
8118 dw2_asm_output_data (1, 0, "DW_LNE_end_sequence");
8119 dw2_asm_output_data_uleb128 (1, NULL
);
8120 dw2_asm_output_data (1, DW_LNE_end_sequence
, NULL
);
8125 for (lt_index
= 0; lt_index
< separate_line_info_table_in_use
;)
8127 dw_separate_line_info_ref line_info
8128 = &separate_line_info_table
[lt_index
];
8131 /* Don't emit anything for redundant notes. */
8132 if (line_info
->dw_line_num
== current_line
8133 && line_info
->dw_file_num
== current_file
8134 && line_info
->function
== function
)
8138 /* Emit debug info for the address of the current line. If this is
8139 a new function, or the first line of a function, then we need
8140 to handle it differently. */
8141 ASM_GENERATE_INTERNAL_LABEL (line_label
, SEPARATE_LINE_CODE_LABEL
,
8143 if (function
!= line_info
->function
)
8145 function
= line_info
->function
;
8147 /* Set the address register to the first line in the function. */
8148 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
8149 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE
, NULL
);
8150 dw2_asm_output_data (1, DW_LNE_set_address
, NULL
);
8151 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, line_label
, NULL
);
8155 /* ??? See the DW_LNS_advance_pc comment above. */
8158 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc
,
8159 "DW_LNS_fixed_advance_pc");
8160 dw2_asm_output_delta (2, line_label
, prev_line_label
, NULL
);
8164 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
8165 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE
, NULL
);
8166 dw2_asm_output_data (1, DW_LNE_set_address
, NULL
);
8167 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, line_label
, NULL
);
8171 strcpy (prev_line_label
, line_label
);
8173 /* Emit debug info for the source file of the current line, if
8174 different from the previous line. */
8175 if (line_info
->dw_file_num
!= current_file
)
8177 current_file
= line_info
->dw_file_num
;
8178 dw2_asm_output_data (1, DW_LNS_set_file
, "DW_LNS_set_file");
8179 dw2_asm_output_data_uleb128 (current_file
, "%lu", current_file
);
8182 /* Emit debug info for the current line number, choosing the encoding
8183 that uses the least amount of space. */
8184 if (line_info
->dw_line_num
!= current_line
)
8186 line_offset
= line_info
->dw_line_num
- current_line
;
8187 line_delta
= line_offset
- DWARF_LINE_BASE
;
8188 current_line
= line_info
->dw_line_num
;
8189 if (line_delta
>= 0 && line_delta
< (DWARF_LINE_RANGE
- 1))
8190 dw2_asm_output_data (1, DWARF_LINE_OPCODE_BASE
+ line_delta
,
8191 "line %lu", current_line
);
8194 dw2_asm_output_data (1, DW_LNS_advance_line
,
8195 "advance to line %lu", current_line
);
8196 dw2_asm_output_data_sleb128 (line_offset
, NULL
);
8197 dw2_asm_output_data (1, DW_LNS_copy
, "DW_LNS_copy");
8201 dw2_asm_output_data (1, DW_LNS_copy
, "DW_LNS_copy");
8209 /* If we're done with a function, end its sequence. */
8210 if (lt_index
== separate_line_info_table_in_use
8211 || separate_line_info_table
[lt_index
].function
!= function
)
8216 /* Emit debug info for the address of the end of the function. */
8217 ASM_GENERATE_INTERNAL_LABEL (line_label
, FUNC_END_LABEL
, function
);
8220 dw2_asm_output_data (1, DW_LNS_fixed_advance_pc
,
8221 "DW_LNS_fixed_advance_pc");
8222 dw2_asm_output_delta (2, line_label
, prev_line_label
, NULL
);
8226 dw2_asm_output_data (1, 0, "DW_LNE_set_address");
8227 dw2_asm_output_data_uleb128 (1 + DWARF2_ADDR_SIZE
, NULL
);
8228 dw2_asm_output_data (1, DW_LNE_set_address
, NULL
);
8229 dw2_asm_output_addr (DWARF2_ADDR_SIZE
, line_label
, NULL
);
8232 /* Output the marker for the end of this sequence. */
8233 dw2_asm_output_data (1, 0, "DW_LNE_end_sequence");
8234 dw2_asm_output_data_uleb128 (1, NULL
);
8235 dw2_asm_output_data (1, DW_LNE_end_sequence
, NULL
);
8239 /* Output the marker for the end of the line number info. */
8240 ASM_OUTPUT_LABEL (asm_out_file
, l2
);
8243 /* Given a pointer to a tree node for some base type, return a pointer to
8244 a DIE that describes the given type.
8246 This routine must only be called for GCC type nodes that correspond to
8247 Dwarf base (fundamental) types. */
8250 base_type_die (tree type
)
8252 dw_die_ref base_type_result
;
8253 enum dwarf_type encoding
;
8255 if (TREE_CODE (type
) == ERROR_MARK
|| TREE_CODE (type
) == VOID_TYPE
)
8258 switch (TREE_CODE (type
))
8261 if (TYPE_STRING_FLAG (type
))
8263 if (TYPE_UNSIGNED (type
))
8264 encoding
= DW_ATE_unsigned_char
;
8266 encoding
= DW_ATE_signed_char
;
8268 else if (TYPE_UNSIGNED (type
))
8269 encoding
= DW_ATE_unsigned
;
8271 encoding
= DW_ATE_signed
;
8275 if (DECIMAL_FLOAT_MODE_P (TYPE_MODE (type
)))
8276 encoding
= DW_ATE_decimal_float
;
8278 encoding
= DW_ATE_float
;
8281 /* Dwarf2 doesn't know anything about complex ints, so use
8282 a user defined type for it. */
8284 if (TREE_CODE (TREE_TYPE (type
)) == REAL_TYPE
)
8285 encoding
= DW_ATE_complex_float
;
8287 encoding
= DW_ATE_lo_user
;
8291 /* GNU FORTRAN/Ada/C++ BOOLEAN type. */
8292 encoding
= DW_ATE_boolean
;
8296 /* No other TREE_CODEs are Dwarf fundamental types. */
8300 base_type_result
= new_die (DW_TAG_base_type
, comp_unit_die
, type
);
8302 /* This probably indicates a bug. */
8303 if (! TYPE_NAME (type
))
8304 add_name_attribute (base_type_result
, "__unknown__");
8306 add_AT_unsigned (base_type_result
, DW_AT_byte_size
,
8307 int_size_in_bytes (type
));
8308 add_AT_unsigned (base_type_result
, DW_AT_encoding
, encoding
);
8310 return base_type_result
;
8313 /* Given a pointer to an arbitrary ..._TYPE tree node, return nonzero if the
8314 given input type is a Dwarf "fundamental" type. Otherwise return null. */
8317 is_base_type (tree type
)
8319 switch (TREE_CODE (type
))
8332 case QUAL_UNION_TYPE
:
8337 case REFERENCE_TYPE
:
8350 /* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
8351 node, return the size in bits for the type if it is a constant, or else
8352 return the alignment for the type if the type's size is not constant, or
8353 else return BITS_PER_WORD if the type actually turns out to be an
8356 static inline unsigned HOST_WIDE_INT
8357 simple_type_size_in_bits (tree type
)
8359 if (TREE_CODE (type
) == ERROR_MARK
)
8360 return BITS_PER_WORD
;
8361 else if (TYPE_SIZE (type
) == NULL_TREE
)
8363 else if (host_integerp (TYPE_SIZE (type
), 1))
8364 return tree_low_cst (TYPE_SIZE (type
), 1);
8366 return TYPE_ALIGN (type
);
8369 /* Return true if the debug information for the given type should be
8370 emitted as a subrange type. */
8373 is_subrange_type (tree type
)
8375 tree subtype
= TREE_TYPE (type
);
8377 /* Subrange types are identified by the fact that they are integer
8378 types, and that they have a subtype which is either an integer type
8379 or an enumeral type. */
8381 if (TREE_CODE (type
) != INTEGER_TYPE
8382 || subtype
== NULL_TREE
)
8385 if (TREE_CODE (subtype
) != INTEGER_TYPE
8386 && TREE_CODE (subtype
) != ENUMERAL_TYPE
)
8389 if (TREE_CODE (type
) == TREE_CODE (subtype
)
8390 && int_size_in_bytes (type
) == int_size_in_bytes (subtype
)
8391 && TYPE_MIN_VALUE (type
) != NULL
8392 && TYPE_MIN_VALUE (subtype
) != NULL
8393 && tree_int_cst_equal (TYPE_MIN_VALUE (type
), TYPE_MIN_VALUE (subtype
))
8394 && TYPE_MAX_VALUE (type
) != NULL
8395 && TYPE_MAX_VALUE (subtype
) != NULL
8396 && tree_int_cst_equal (TYPE_MAX_VALUE (type
), TYPE_MAX_VALUE (subtype
)))
8398 /* The type and its subtype have the same representation. If in
8399 addition the two types also have the same name, then the given
8400 type is not a subrange type, but rather a plain base type. */
8401 /* FIXME: brobecker/2004-03-22:
8402 Sizetype INTEGER_CSTs nodes are canonicalized. It should
8403 therefore be sufficient to check the TYPE_SIZE node pointers
8404 rather than checking the actual size. Unfortunately, we have
8405 found some cases, such as in the Ada "integer" type, where
8406 this is not the case. Until this problem is solved, we need to
8407 keep checking the actual size. */
8408 tree type_name
= TYPE_NAME (type
);
8409 tree subtype_name
= TYPE_NAME (subtype
);
8411 if (type_name
!= NULL
&& TREE_CODE (type_name
) == TYPE_DECL
)
8412 type_name
= DECL_NAME (type_name
);
8414 if (subtype_name
!= NULL
&& TREE_CODE (subtype_name
) == TYPE_DECL
)
8415 subtype_name
= DECL_NAME (subtype_name
);
8417 if (type_name
== subtype_name
)
8424 /* Given a pointer to a tree node for a subrange type, return a pointer
8425 to a DIE that describes the given type. */
8428 subrange_type_die (tree type
, dw_die_ref context_die
)
8430 dw_die_ref subrange_die
;
8431 const HOST_WIDE_INT size_in_bytes
= int_size_in_bytes (type
);
8433 if (context_die
== NULL
)
8434 context_die
= comp_unit_die
;
8436 subrange_die
= new_die (DW_TAG_subrange_type
, context_die
, type
);
8438 if (int_size_in_bytes (TREE_TYPE (type
)) != size_in_bytes
)
8440 /* The size of the subrange type and its base type do not match,
8441 so we need to generate a size attribute for the subrange type. */
8442 add_AT_unsigned (subrange_die
, DW_AT_byte_size
, size_in_bytes
);
8445 if (TYPE_MIN_VALUE (type
) != NULL
)
8446 add_bound_info (subrange_die
, DW_AT_lower_bound
,
8447 TYPE_MIN_VALUE (type
));
8448 if (TYPE_MAX_VALUE (type
) != NULL
)
8449 add_bound_info (subrange_die
, DW_AT_upper_bound
,
8450 TYPE_MAX_VALUE (type
));
8452 return subrange_die
;
8455 /* Given a pointer to an arbitrary ..._TYPE tree node, return a debugging
8456 entry that chains various modifiers in front of the given type. */
8459 modified_type_die (tree type
, int is_const_type
, int is_volatile_type
,
8460 dw_die_ref context_die
)
8462 enum tree_code code
= TREE_CODE (type
);
8463 dw_die_ref mod_type_die
;
8464 dw_die_ref sub_die
= NULL
;
8465 tree item_type
= NULL
;
8466 tree qualified_type
;
8469 if (code
== ERROR_MARK
)
8472 /* See if we already have the appropriately qualified variant of
8475 = get_qualified_type (type
,
8476 ((is_const_type
? TYPE_QUAL_CONST
: 0)
8477 | (is_volatile_type
? TYPE_QUAL_VOLATILE
: 0)));
8479 /* If we do, then we can just use its DIE, if it exists. */
8482 mod_type_die
= lookup_type_die (qualified_type
);
8484 return mod_type_die
;
8487 name
= qualified_type
? TYPE_NAME (qualified_type
) : NULL
;
8489 /* Handle C typedef types. */
8490 if (name
&& TREE_CODE (name
) == TYPE_DECL
&& DECL_ORIGINAL_TYPE (name
))
8492 tree dtype
= TREE_TYPE (name
);
8494 if (qualified_type
== dtype
)
8496 /* For a named type, use the typedef. */
8497 gen_type_die (qualified_type
, context_die
);
8498 return lookup_type_die (qualified_type
);
8500 else if (is_const_type
< TYPE_READONLY (dtype
)
8501 || is_volatile_type
< TYPE_VOLATILE (dtype
)
8502 || (is_const_type
<= TYPE_READONLY (dtype
)
8503 && is_volatile_type
<= TYPE_VOLATILE (dtype
)
8504 && DECL_ORIGINAL_TYPE (name
) != type
))
8505 /* cv-unqualified version of named type. Just use the unnamed
8506 type to which it refers. */
8507 return modified_type_die (DECL_ORIGINAL_TYPE (name
),
8508 is_const_type
, is_volatile_type
,
8510 /* Else cv-qualified version of named type; fall through. */
8515 mod_type_die
= new_die (DW_TAG_const_type
, comp_unit_die
, type
);
8516 sub_die
= modified_type_die (type
, 0, is_volatile_type
, context_die
);
8518 else if (is_volatile_type
)
8520 mod_type_die
= new_die (DW_TAG_volatile_type
, comp_unit_die
, type
);
8521 sub_die
= modified_type_die (type
, 0, 0, context_die
);
8523 else if (code
== POINTER_TYPE
)
8525 mod_type_die
= new_die (DW_TAG_pointer_type
, comp_unit_die
, type
);
8526 add_AT_unsigned (mod_type_die
, DW_AT_byte_size
,
8527 simple_type_size_in_bits (type
) / BITS_PER_UNIT
);
8528 item_type
= TREE_TYPE (type
);
8530 else if (code
== REFERENCE_TYPE
)
8532 mod_type_die
= new_die (DW_TAG_reference_type
, comp_unit_die
, type
);
8533 add_AT_unsigned (mod_type_die
, DW_AT_byte_size
,
8534 simple_type_size_in_bits (type
) / BITS_PER_UNIT
);
8535 item_type
= TREE_TYPE (type
);
8537 else if (is_subrange_type (type
))
8539 mod_type_die
= subrange_type_die (type
, context_die
);
8540 item_type
= TREE_TYPE (type
);
8542 else if (is_base_type (type
))
8543 mod_type_die
= base_type_die (type
);
8546 gen_type_die (type
, context_die
);
8548 /* We have to get the type_main_variant here (and pass that to the
8549 `lookup_type_die' routine) because the ..._TYPE node we have
8550 might simply be a *copy* of some original type node (where the
8551 copy was created to help us keep track of typedef names) and
8552 that copy might have a different TYPE_UID from the original
8554 if (TREE_CODE (type
) != VECTOR_TYPE
)
8555 return lookup_type_die (type_main_variant (type
));
8557 /* Vectors have the debugging information in the type,
8558 not the main variant. */
8559 return lookup_type_die (type
);
8562 /* Builtin types don't have a DECL_ORIGINAL_TYPE. For those,
8563 don't output a DW_TAG_typedef, since there isn't one in the
8564 user's program; just attach a DW_AT_name to the type. */
8566 && (TREE_CODE (name
) != TYPE_DECL
|| TREE_TYPE (name
) == qualified_type
))
8568 if (TREE_CODE (name
) == TYPE_DECL
)
8569 /* Could just call add_name_and_src_coords_attributes here,
8570 but since this is a builtin type it doesn't have any
8571 useful source coordinates anyway. */
8572 name
= DECL_NAME (name
);
8573 add_name_attribute (mod_type_die
, IDENTIFIER_POINTER (name
));
8577 equate_type_number_to_die (qualified_type
, mod_type_die
);
8580 /* We must do this after the equate_type_number_to_die call, in case
8581 this is a recursive type. This ensures that the modified_type_die
8582 recursion will terminate even if the type is recursive. Recursive
8583 types are possible in Ada. */
8584 sub_die
= modified_type_die (item_type
,
8585 TYPE_READONLY (item_type
),
8586 TYPE_VOLATILE (item_type
),
8589 if (sub_die
!= NULL
)
8590 add_AT_die_ref (mod_type_die
, DW_AT_type
, sub_die
);
8592 return mod_type_die
;
8595 /* Given a pointer to an arbitrary ..._TYPE tree node, return true if it is
8596 an enumerated type. */
8599 type_is_enum (tree type
)
8601 return TREE_CODE (type
) == ENUMERAL_TYPE
;
8604 /* Return the DBX register number described by a given RTL node. */
8607 dbx_reg_number (rtx rtl
)
8609 unsigned regno
= REGNO (rtl
);
8611 gcc_assert (regno
< FIRST_PSEUDO_REGISTER
);
8613 #ifdef LEAF_REG_REMAP
8614 if (current_function_uses_only_leaf_regs
)
8616 int leaf_reg
= LEAF_REG_REMAP (regno
);
8618 regno
= (unsigned) leaf_reg
;
8622 return DBX_REGISTER_NUMBER (regno
);
8625 /* Optionally add a DW_OP_piece term to a location description expression.
8626 DW_OP_piece is only added if the location description expression already
8627 doesn't end with DW_OP_piece. */
8630 add_loc_descr_op_piece (dw_loc_descr_ref
*list_head
, int size
)
8632 dw_loc_descr_ref loc
;
8634 if (*list_head
!= NULL
)
8636 /* Find the end of the chain. */
8637 for (loc
= *list_head
; loc
->dw_loc_next
!= NULL
; loc
= loc
->dw_loc_next
)
8640 if (loc
->dw_loc_opc
!= DW_OP_piece
)
8641 loc
->dw_loc_next
= new_loc_descr (DW_OP_piece
, size
, 0);
8645 /* Return a location descriptor that designates a machine register or
8646 zero if there is none. */
8648 static dw_loc_descr_ref
8649 reg_loc_descriptor (rtx rtl
)
8653 if (REGNO (rtl
) >= FIRST_PSEUDO_REGISTER
)
8656 regs
= targetm
.dwarf_register_span (rtl
);
8658 if (hard_regno_nregs
[REGNO (rtl
)][GET_MODE (rtl
)] > 1 || regs
)
8659 return multiple_reg_loc_descriptor (rtl
, regs
);
8661 return one_reg_loc_descriptor (dbx_reg_number (rtl
));
8664 /* Return a location descriptor that designates a machine register for
8665 a given hard register number. */
8667 static dw_loc_descr_ref
8668 one_reg_loc_descriptor (unsigned int regno
)
8671 return new_loc_descr (DW_OP_reg0
+ regno
, 0, 0);
8673 return new_loc_descr (DW_OP_regx
, regno
, 0);
8676 /* Given an RTL of a register, return a location descriptor that
8677 designates a value that spans more than one register. */
8679 static dw_loc_descr_ref
8680 multiple_reg_loc_descriptor (rtx rtl
, rtx regs
)
8684 dw_loc_descr_ref loc_result
= NULL
;
8687 #ifdef LEAF_REG_REMAP
8688 if (current_function_uses_only_leaf_regs
)
8690 int leaf_reg
= LEAF_REG_REMAP (reg
);
8692 reg
= (unsigned) leaf_reg
;
8695 gcc_assert ((unsigned) DBX_REGISTER_NUMBER (reg
) == dbx_reg_number (rtl
));
8696 nregs
= hard_regno_nregs
[REGNO (rtl
)][GET_MODE (rtl
)];
8698 /* Simple, contiguous registers. */
8699 if (regs
== NULL_RTX
)
8701 size
= GET_MODE_SIZE (GET_MODE (rtl
)) / nregs
;
8708 t
= one_reg_loc_descriptor (DBX_REGISTER_NUMBER (reg
));
8709 add_loc_descr (&loc_result
, t
);
8710 add_loc_descr_op_piece (&loc_result
, size
);
8716 /* Now onto stupid register sets in non contiguous locations. */
8718 gcc_assert (GET_CODE (regs
) == PARALLEL
);
8720 size
= GET_MODE_SIZE (GET_MODE (XVECEXP (regs
, 0, 0)));
8723 for (i
= 0; i
< XVECLEN (regs
, 0); ++i
)
8727 t
= one_reg_loc_descriptor (REGNO (XVECEXP (regs
, 0, i
)));
8728 add_loc_descr (&loc_result
, t
);
8729 size
= GET_MODE_SIZE (GET_MODE (XVECEXP (regs
, 0, 0)));
8730 add_loc_descr_op_piece (&loc_result
, size
);
8735 /* Return a location descriptor that designates a constant. */
8737 static dw_loc_descr_ref
8738 int_loc_descriptor (HOST_WIDE_INT i
)
8740 enum dwarf_location_atom op
;
8742 /* Pick the smallest representation of a constant, rather than just
8743 defaulting to the LEB encoding. */
8747 op
= DW_OP_lit0
+ i
;
8750 else if (i
<= 0xffff)
8752 else if (HOST_BITS_PER_WIDE_INT
== 32
8762 else if (i
>= -0x8000)
8764 else if (HOST_BITS_PER_WIDE_INT
== 32
8765 || i
>= -0x80000000)
8771 return new_loc_descr (op
, i
, 0);
8774 /* Return a location descriptor that designates a base+offset location. */
8776 static dw_loc_descr_ref
8777 based_loc_descr (rtx reg
, HOST_WIDE_INT offset
)
8781 /* We only use "frame base" when we're sure we're talking about the
8782 post-prologue local stack frame. We do this by *not* running
8783 register elimination until this point, and recognizing the special
8784 argument pointer and soft frame pointer rtx's. */
8785 if (reg
== arg_pointer_rtx
|| reg
== frame_pointer_rtx
)
8787 rtx elim
= eliminate_regs (reg
, VOIDmode
, NULL_RTX
);
8791 if (GET_CODE (elim
) == PLUS
)
8793 offset
+= INTVAL (XEXP (elim
, 1));
8794 elim
= XEXP (elim
, 0);
8796 gcc_assert (elim
== (frame_pointer_needed
? hard_frame_pointer_rtx
8797 : stack_pointer_rtx
));
8798 offset
+= frame_pointer_fb_offset
;
8800 return new_loc_descr (DW_OP_fbreg
, offset
, 0);
8804 regno
= dbx_reg_number (reg
);
8806 return new_loc_descr (DW_OP_breg0
+ regno
, offset
, 0);
8808 return new_loc_descr (DW_OP_bregx
, regno
, offset
);
8811 /* Return true if this RTL expression describes a base+offset calculation. */
8814 is_based_loc (rtx rtl
)
8816 return (GET_CODE (rtl
) == PLUS
8817 && ((REG_P (XEXP (rtl
, 0))
8818 && REGNO (XEXP (rtl
, 0)) < FIRST_PSEUDO_REGISTER
8819 && GET_CODE (XEXP (rtl
, 1)) == CONST_INT
)));
8822 /* Return a descriptor that describes the concatenation of N locations
8823 used to form the address of a memory location. */
8825 static dw_loc_descr_ref
8826 concatn_mem_loc_descriptor (rtx concatn
, enum machine_mode mode
)
8829 dw_loc_descr_ref cc_loc_result
= NULL
;
8830 unsigned int n
= XVECLEN (concatn
, 0);
8832 for (i
= 0; i
< n
; ++i
)
8834 dw_loc_descr_ref ref
;
8835 rtx x
= XVECEXP (concatn
, 0, i
);
8837 ref
= mem_loc_descriptor (x
, mode
);
8841 add_loc_descr (&cc_loc_result
, ref
);
8842 add_loc_descr_op_piece (&cc_loc_result
, GET_MODE_SIZE (GET_MODE (x
)));
8845 return cc_loc_result
;
8848 /* The following routine converts the RTL for a variable or parameter
8849 (resident in memory) into an equivalent Dwarf representation of a
8850 mechanism for getting the address of that same variable onto the top of a
8851 hypothetical "address evaluation" stack.
8853 When creating memory location descriptors, we are effectively transforming
8854 the RTL for a memory-resident object into its Dwarf postfix expression
8855 equivalent. This routine recursively descends an RTL tree, turning
8856 it into Dwarf postfix code as it goes.
8858 MODE is the mode of the memory reference, needed to handle some
8859 autoincrement addressing modes.
8861 CAN_USE_FBREG is a flag whether we can use DW_AT_frame_base in the
8862 location list for RTL.
8864 Return 0 if we can't represent the location. */
8866 static dw_loc_descr_ref
8867 mem_loc_descriptor (rtx rtl
, enum machine_mode mode
)
8869 dw_loc_descr_ref mem_loc_result
= NULL
;
8870 enum dwarf_location_atom op
;
8872 /* Note that for a dynamically sized array, the location we will generate a
8873 description of here will be the lowest numbered location which is
8874 actually within the array. That's *not* necessarily the same as the
8875 zeroth element of the array. */
8877 rtl
= targetm
.delegitimize_address (rtl
);
8879 switch (GET_CODE (rtl
))
8884 /* POST_INC and POST_DEC can be handled just like a SUBREG. So we
8885 just fall into the SUBREG code. */
8887 /* ... fall through ... */
8890 /* The case of a subreg may arise when we have a local (register)
8891 variable or a formal (register) parameter which doesn't quite fill
8892 up an entire register. For now, just assume that it is
8893 legitimate to make the Dwarf info refer to the whole register which
8894 contains the given subreg. */
8895 rtl
= XEXP (rtl
, 0);
8897 /* ... fall through ... */
8900 /* Whenever a register number forms a part of the description of the
8901 method for calculating the (dynamic) address of a memory resident
8902 object, DWARF rules require the register number be referred to as
8903 a "base register". This distinction is not based in any way upon
8904 what category of register the hardware believes the given register
8905 belongs to. This is strictly DWARF terminology we're dealing with
8906 here. Note that in cases where the location of a memory-resident
8907 data object could be expressed as: OP_ADD (OP_BASEREG (basereg),
8908 OP_CONST (0)) the actual DWARF location descriptor that we generate
8909 may just be OP_BASEREG (basereg). This may look deceptively like
8910 the object in question was allocated to a register (rather than in
8911 memory) so DWARF consumers need to be aware of the subtle
8912 distinction between OP_REG and OP_BASEREG. */
8913 if (REGNO (rtl
) < FIRST_PSEUDO_REGISTER
)
8914 mem_loc_result
= based_loc_descr (rtl
, 0);
8918 mem_loc_result
= mem_loc_descriptor (XEXP (rtl
, 0), GET_MODE (rtl
));
8919 if (mem_loc_result
!= 0)
8920 add_loc_descr (&mem_loc_result
, new_loc_descr (DW_OP_deref
, 0, 0));
8924 rtl
= XEXP (rtl
, 1);
8926 /* ... fall through ... */
8929 /* Some ports can transform a symbol ref into a label ref, because
8930 the symbol ref is too far away and has to be dumped into a constant
8934 /* Alternatively, the symbol in the constant pool might be referenced
8935 by a different symbol. */
8936 if (GET_CODE (rtl
) == SYMBOL_REF
&& CONSTANT_POOL_ADDRESS_P (rtl
))
8939 rtx tmp
= get_pool_constant_mark (rtl
, &marked
);
8941 if (GET_CODE (tmp
) == SYMBOL_REF
)
8944 if (CONSTANT_POOL_ADDRESS_P (tmp
))
8945 get_pool_constant_mark (tmp
, &marked
);
8950 /* If all references to this pool constant were optimized away,
8951 it was not output and thus we can't represent it.
8952 FIXME: might try to use DW_OP_const_value here, though
8953 DW_OP_piece complicates it. */
8958 mem_loc_result
= new_loc_descr (DW_OP_addr
, 0, 0);
8959 mem_loc_result
->dw_loc_oprnd1
.val_class
= dw_val_class_addr
;
8960 mem_loc_result
->dw_loc_oprnd1
.v
.val_addr
= rtl
;
8961 VEC_safe_push (rtx
, gc
, used_rtx_array
, rtl
);
8965 /* Extract the PLUS expression nested inside and fall into
8967 rtl
= XEXP (rtl
, 1);
8972 /* Turn these into a PLUS expression and fall into the PLUS code
8974 rtl
= gen_rtx_PLUS (word_mode
, XEXP (rtl
, 0),
8975 GEN_INT (GET_CODE (rtl
) == PRE_INC
8976 ? GET_MODE_UNIT_SIZE (mode
)
8977 : -GET_MODE_UNIT_SIZE (mode
)));
8979 /* ... fall through ... */
8983 if (is_based_loc (rtl
))
8984 mem_loc_result
= based_loc_descr (XEXP (rtl
, 0),
8985 INTVAL (XEXP (rtl
, 1)));
8988 mem_loc_result
= mem_loc_descriptor (XEXP (rtl
, 0), mode
);
8989 if (mem_loc_result
== 0)
8992 if (GET_CODE (XEXP (rtl
, 1)) == CONST_INT
8993 && INTVAL (XEXP (rtl
, 1)) >= 0)
8994 add_loc_descr (&mem_loc_result
,
8995 new_loc_descr (DW_OP_plus_uconst
,
8996 INTVAL (XEXP (rtl
, 1)), 0));
8999 add_loc_descr (&mem_loc_result
,
9000 mem_loc_descriptor (XEXP (rtl
, 1), mode
));
9001 add_loc_descr (&mem_loc_result
,
9002 new_loc_descr (DW_OP_plus
, 0, 0));
9007 /* If a pseudo-reg is optimized away, it is possible for it to
9008 be replaced with a MEM containing a multiply or shift. */
9027 dw_loc_descr_ref op0
= mem_loc_descriptor (XEXP (rtl
, 0), mode
);
9028 dw_loc_descr_ref op1
= mem_loc_descriptor (XEXP (rtl
, 1), mode
);
9030 if (op0
== 0 || op1
== 0)
9033 mem_loc_result
= op0
;
9034 add_loc_descr (&mem_loc_result
, op1
);
9035 add_loc_descr (&mem_loc_result
, new_loc_descr (op
, 0, 0));
9040 mem_loc_result
= int_loc_descriptor (INTVAL (rtl
));
9044 mem_loc_result
= concatn_mem_loc_descriptor (rtl
, mode
);
9051 return mem_loc_result
;
9054 /* Return a descriptor that describes the concatenation of two locations.
9055 This is typically a complex variable. */
9057 static dw_loc_descr_ref
9058 concat_loc_descriptor (rtx x0
, rtx x1
)
9060 dw_loc_descr_ref cc_loc_result
= NULL
;
9061 dw_loc_descr_ref x0_ref
= loc_descriptor (x0
);
9062 dw_loc_descr_ref x1_ref
= loc_descriptor (x1
);
9064 if (x0_ref
== 0 || x1_ref
== 0)
9067 cc_loc_result
= x0_ref
;
9068 add_loc_descr_op_piece (&cc_loc_result
, GET_MODE_SIZE (GET_MODE (x0
)));
9070 add_loc_descr (&cc_loc_result
, x1_ref
);
9071 add_loc_descr_op_piece (&cc_loc_result
, GET_MODE_SIZE (GET_MODE (x1
)));
9073 return cc_loc_result
;
9076 /* Return a descriptor that describes the concatenation of N
9079 static dw_loc_descr_ref
9080 concatn_loc_descriptor (rtx concatn
)
9083 dw_loc_descr_ref cc_loc_result
= NULL
;
9084 unsigned int n
= XVECLEN (concatn
, 0);
9086 for (i
= 0; i
< n
; ++i
)
9088 dw_loc_descr_ref ref
;
9089 rtx x
= XVECEXP (concatn
, 0, i
);
9091 ref
= loc_descriptor (x
);
9095 add_loc_descr (&cc_loc_result
, ref
);
9096 add_loc_descr_op_piece (&cc_loc_result
, GET_MODE_SIZE (GET_MODE (x
)));
9099 return cc_loc_result
;
9102 /* Output a proper Dwarf location descriptor for a variable or parameter
9103 which is either allocated in a register or in a memory location. For a
9104 register, we just generate an OP_REG and the register number. For a
9105 memory location we provide a Dwarf postfix expression describing how to
9106 generate the (dynamic) address of the object onto the address stack.
9108 If we don't know how to describe it, return 0. */
9110 static dw_loc_descr_ref
9111 loc_descriptor (rtx rtl
)
9113 dw_loc_descr_ref loc_result
= NULL
;
9115 switch (GET_CODE (rtl
))
9118 /* The case of a subreg may arise when we have a local (register)
9119 variable or a formal (register) parameter which doesn't quite fill
9120 up an entire register. For now, just assume that it is
9121 legitimate to make the Dwarf info refer to the whole register which
9122 contains the given subreg. */
9123 rtl
= SUBREG_REG (rtl
);
9125 /* ... fall through ... */
9128 loc_result
= reg_loc_descriptor (rtl
);
9132 loc_result
= mem_loc_descriptor (XEXP (rtl
, 0), GET_MODE (rtl
));
9136 loc_result
= concat_loc_descriptor (XEXP (rtl
, 0), XEXP (rtl
, 1));
9140 loc_result
= concatn_loc_descriptor (rtl
);
9145 if (GET_CODE (XEXP (rtl
, 1)) != PARALLEL
)
9147 loc_result
= loc_descriptor (XEXP (XEXP (rtl
, 1), 0));
9151 rtl
= XEXP (rtl
, 1);
9156 rtvec par_elems
= XVEC (rtl
, 0);
9157 int num_elem
= GET_NUM_ELEM (par_elems
);
9158 enum machine_mode mode
;
9161 /* Create the first one, so we have something to add to. */
9162 loc_result
= loc_descriptor (XEXP (RTVEC_ELT (par_elems
, 0), 0));
9163 mode
= GET_MODE (XEXP (RTVEC_ELT (par_elems
, 0), 0));
9164 add_loc_descr_op_piece (&loc_result
, GET_MODE_SIZE (mode
));
9165 for (i
= 1; i
< num_elem
; i
++)
9167 dw_loc_descr_ref temp
;
9169 temp
= loc_descriptor (XEXP (RTVEC_ELT (par_elems
, i
), 0));
9170 add_loc_descr (&loc_result
, temp
);
9171 mode
= GET_MODE (XEXP (RTVEC_ELT (par_elems
, i
), 0));
9172 add_loc_descr_op_piece (&loc_result
, GET_MODE_SIZE (mode
));
9184 /* Similar, but generate the descriptor from trees instead of rtl. This comes
9185 up particularly with variable length arrays. WANT_ADDRESS is 2 if this is
9186 a top-level invocation of loc_descriptor_from_tree; is 1 if this is not a
9187 top-level invocation, and we require the address of LOC; is 0 if we require
9188 the value of LOC. */
9190 static dw_loc_descr_ref
9191 loc_descriptor_from_tree_1 (tree loc
, int want_address
)
9193 dw_loc_descr_ref ret
, ret1
;
9194 int have_address
= 0;
9195 enum dwarf_location_atom op
;
9197 /* ??? Most of the time we do not take proper care for sign/zero
9198 extending the values properly. Hopefully this won't be a real
9201 switch (TREE_CODE (loc
))
9206 case PLACEHOLDER_EXPR
:
9207 /* This case involves extracting fields from an object to determine the
9208 position of other fields. We don't try to encode this here. The
9209 only user of this is Ada, which encodes the needed information using
9210 the names of types. */
9216 case PREINCREMENT_EXPR
:
9217 case PREDECREMENT_EXPR
:
9218 case POSTINCREMENT_EXPR
:
9219 case POSTDECREMENT_EXPR
:
9220 /* There are no opcodes for these operations. */
9224 /* If we already want an address, there's nothing we can do. */
9228 /* Otherwise, process the argument and look for the address. */
9229 return loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 0), 1);
9232 if (DECL_THREAD_LOCAL_P (loc
))
9236 /* If this is not defined, we have no way to emit the data. */
9237 if (!targetm
.have_tls
|| !targetm
.asm_out
.output_dwarf_dtprel
)
9240 /* The way DW_OP_GNU_push_tls_address is specified, we can only
9241 look up addresses of objects in the current module. */
9242 if (DECL_EXTERNAL (loc
))
9245 rtl
= rtl_for_decl_location (loc
);
9246 if (rtl
== NULL_RTX
)
9251 rtl
= XEXP (rtl
, 0);
9252 if (! CONSTANT_P (rtl
))
9255 ret
= new_loc_descr (INTERNAL_DW_OP_tls_addr
, 0, 0);
9256 ret
->dw_loc_oprnd1
.val_class
= dw_val_class_addr
;
9257 ret
->dw_loc_oprnd1
.v
.val_addr
= rtl
;
9259 ret1
= new_loc_descr (DW_OP_GNU_push_tls_address
, 0, 0);
9260 add_loc_descr (&ret
, ret1
);
9268 if (DECL_HAS_VALUE_EXPR_P (loc
))
9269 return loc_descriptor_from_tree_1 (DECL_VALUE_EXPR (loc
),
9276 rtx rtl
= rtl_for_decl_location (loc
);
9278 if (rtl
== NULL_RTX
)
9280 else if (GET_CODE (rtl
) == CONST_INT
)
9282 HOST_WIDE_INT val
= INTVAL (rtl
);
9283 if (TYPE_UNSIGNED (TREE_TYPE (loc
)))
9284 val
&= GET_MODE_MASK (DECL_MODE (loc
));
9285 ret
= int_loc_descriptor (val
);
9287 else if (GET_CODE (rtl
) == CONST_STRING
)
9289 else if (CONSTANT_P (rtl
))
9291 ret
= new_loc_descr (DW_OP_addr
, 0, 0);
9292 ret
->dw_loc_oprnd1
.val_class
= dw_val_class_addr
;
9293 ret
->dw_loc_oprnd1
.v
.val_addr
= rtl
;
9297 enum machine_mode mode
;
9299 /* Certain constructs can only be represented at top-level. */
9300 if (want_address
== 2)
9301 return loc_descriptor (rtl
);
9303 mode
= GET_MODE (rtl
);
9306 rtl
= XEXP (rtl
, 0);
9309 ret
= mem_loc_descriptor (rtl
, mode
);
9315 ret
= loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 0), 0);
9320 return loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 1), want_address
);
9324 case NON_LVALUE_EXPR
:
9325 case VIEW_CONVERT_EXPR
:
9327 case GIMPLE_MODIFY_STMT
:
9328 return loc_descriptor_from_tree_1 (GENERIC_TREE_OPERAND (loc
, 0),
9334 case ARRAY_RANGE_REF
:
9337 HOST_WIDE_INT bitsize
, bitpos
, bytepos
;
9338 enum machine_mode mode
;
9340 int unsignedp
= TYPE_UNSIGNED (TREE_TYPE (loc
));
9342 obj
= get_inner_reference (loc
, &bitsize
, &bitpos
, &offset
, &mode
,
9343 &unsignedp
, &volatilep
, false);
9348 ret
= loc_descriptor_from_tree_1 (obj
, 1);
9350 || bitpos
% BITS_PER_UNIT
!= 0 || bitsize
% BITS_PER_UNIT
!= 0)
9353 if (offset
!= NULL_TREE
)
9355 /* Variable offset. */
9356 add_loc_descr (&ret
, loc_descriptor_from_tree_1 (offset
, 0));
9357 add_loc_descr (&ret
, new_loc_descr (DW_OP_plus
, 0, 0));
9360 bytepos
= bitpos
/ BITS_PER_UNIT
;
9362 add_loc_descr (&ret
, new_loc_descr (DW_OP_plus_uconst
, bytepos
, 0));
9363 else if (bytepos
< 0)
9365 add_loc_descr (&ret
, int_loc_descriptor (bytepos
));
9366 add_loc_descr (&ret
, new_loc_descr (DW_OP_plus
, 0, 0));
9374 if (host_integerp (loc
, 0))
9375 ret
= int_loc_descriptor (tree_low_cst (loc
, 0));
9382 /* Get an RTL for this, if something has been emitted. */
9383 rtx rtl
= lookup_constant_def (loc
);
9384 enum machine_mode mode
;
9386 if (!rtl
|| !MEM_P (rtl
))
9388 mode
= GET_MODE (rtl
);
9389 rtl
= XEXP (rtl
, 0);
9390 ret
= mem_loc_descriptor (rtl
, mode
);
9395 case TRUTH_AND_EXPR
:
9396 case TRUTH_ANDIF_EXPR
:
9401 case TRUTH_XOR_EXPR
:
9407 case TRUTH_ORIF_EXPR
:
9412 case FLOOR_DIV_EXPR
:
9414 case ROUND_DIV_EXPR
:
9415 case TRUNC_DIV_EXPR
:
9423 case FLOOR_MOD_EXPR
:
9425 case ROUND_MOD_EXPR
:
9426 case TRUNC_MOD_EXPR
:
9439 op
= (TYPE_UNSIGNED (TREE_TYPE (loc
)) ? DW_OP_shr
: DW_OP_shra
);
9443 if (TREE_CODE (TREE_OPERAND (loc
, 1)) == INTEGER_CST
9444 && host_integerp (TREE_OPERAND (loc
, 1), 0))
9446 ret
= loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 0), 0);
9450 add_loc_descr (&ret
,
9451 new_loc_descr (DW_OP_plus_uconst
,
9452 tree_low_cst (TREE_OPERAND (loc
, 1),
9462 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc
, 0))))
9469 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc
, 0))))
9476 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc
, 0))))
9483 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (loc
, 0))))
9498 ret
= loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 0), 0);
9499 ret1
= loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 1), 0);
9500 if (ret
== 0 || ret1
== 0)
9503 add_loc_descr (&ret
, ret1
);
9504 add_loc_descr (&ret
, new_loc_descr (op
, 0, 0));
9507 case TRUTH_NOT_EXPR
:
9521 ret
= loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 0), 0);
9525 add_loc_descr (&ret
, new_loc_descr (op
, 0, 0));
9531 const enum tree_code code
=
9532 TREE_CODE (loc
) == MIN_EXPR
? GT_EXPR
: LT_EXPR
;
9534 loc
= build3 (COND_EXPR
, TREE_TYPE (loc
),
9535 build2 (code
, integer_type_node
,
9536 TREE_OPERAND (loc
, 0), TREE_OPERAND (loc
, 1)),
9537 TREE_OPERAND (loc
, 1), TREE_OPERAND (loc
, 0));
9540 /* ... fall through ... */
9544 dw_loc_descr_ref lhs
9545 = loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 1), 0);
9546 dw_loc_descr_ref rhs
9547 = loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 2), 0);
9548 dw_loc_descr_ref bra_node
, jump_node
, tmp
;
9550 ret
= loc_descriptor_from_tree_1 (TREE_OPERAND (loc
, 0), 0);
9551 if (ret
== 0 || lhs
== 0 || rhs
== 0)
9554 bra_node
= new_loc_descr (DW_OP_bra
, 0, 0);
9555 add_loc_descr (&ret
, bra_node
);
9557 add_loc_descr (&ret
, rhs
);
9558 jump_node
= new_loc_descr (DW_OP_skip
, 0, 0);
9559 add_loc_descr (&ret
, jump_node
);
9561 add_loc_descr (&ret
, lhs
);
9562 bra_node
->dw_loc_oprnd1
.val_class
= dw_val_class_loc
;
9563 bra_node
->dw_loc_oprnd1
.v
.val_loc
= lhs
;
9565 /* ??? Need a node to point the skip at. Use a nop. */
9566 tmp
= new_loc_descr (DW_OP_nop
, 0, 0);
9567 add_loc_descr (&ret
, tmp
);
9568 jump_node
->dw_loc_oprnd1
.val_class
= dw_val_class_loc
;
9569 jump_node
->dw_loc_oprnd1
.v
.val_loc
= tmp
;
9573 case FIX_TRUNC_EXPR
:
9577 /* Leave front-end specific codes as simply unknown. This comes
9578 up, for instance, with the C STMT_EXPR. */
9579 if ((unsigned int) TREE_CODE (loc
)
9580 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
)
9583 #ifdef ENABLE_CHECKING
9584 /* Otherwise this is a generic code; we should just lists all of
9585 these explicitly. We forgot one. */
9588 /* In a release build, we want to degrade gracefully: better to
9589 generate incomplete debugging information than to crash. */
9594 /* Show if we can't fill the request for an address. */
9595 if (want_address
&& !have_address
)
9598 /* If we've got an address and don't want one, dereference. */
9599 if (!want_address
&& have_address
&& ret
)
9601 HOST_WIDE_INT size
= int_size_in_bytes (TREE_TYPE (loc
));
9603 if (size
> DWARF2_ADDR_SIZE
|| size
== -1)
9605 else if (size
== DWARF2_ADDR_SIZE
)
9608 op
= DW_OP_deref_size
;
9610 add_loc_descr (&ret
, new_loc_descr (op
, size
, 0));
9616 static inline dw_loc_descr_ref
9617 loc_descriptor_from_tree (tree loc
)
9619 return loc_descriptor_from_tree_1 (loc
, 2);
9622 /* Given a value, round it up to the lowest multiple of `boundary'
9623 which is not less than the value itself. */
9625 static inline HOST_WIDE_INT
9626 ceiling (HOST_WIDE_INT value
, unsigned int boundary
)
9628 return (((value
+ boundary
- 1) / boundary
) * boundary
);
9631 /* Given a pointer to what is assumed to be a FIELD_DECL node, return a
9632 pointer to the declared type for the relevant field variable, or return
9633 `integer_type_node' if the given node turns out to be an
9637 field_type (tree decl
)
9641 if (TREE_CODE (decl
) == ERROR_MARK
)
9642 return integer_type_node
;
9644 type
= DECL_BIT_FIELD_TYPE (decl
);
9645 if (type
== NULL_TREE
)
9646 type
= TREE_TYPE (decl
);
9651 /* Given a pointer to a tree node, return the alignment in bits for
9652 it, or else return BITS_PER_WORD if the node actually turns out to
9653 be an ERROR_MARK node. */
9655 static inline unsigned
9656 simple_type_align_in_bits (tree type
)
9658 return (TREE_CODE (type
) != ERROR_MARK
) ? TYPE_ALIGN (type
) : BITS_PER_WORD
;
9661 static inline unsigned
9662 simple_decl_align_in_bits (tree decl
)
9664 return (TREE_CODE (decl
) != ERROR_MARK
) ? DECL_ALIGN (decl
) : BITS_PER_WORD
;
9667 /* Return the result of rounding T up to ALIGN. */
9669 static inline HOST_WIDE_INT
9670 round_up_to_align (HOST_WIDE_INT t
, unsigned int align
)
9672 /* We must be careful if T is negative because HOST_WIDE_INT can be
9673 either "above" or "below" unsigned int as per the C promotion
9674 rules, depending on the host, thus making the signedness of the
9675 direct multiplication and division unpredictable. */
9676 unsigned HOST_WIDE_INT u
= (unsigned HOST_WIDE_INT
) t
;
9682 return (HOST_WIDE_INT
) u
;
9685 /* Given a pointer to a FIELD_DECL, compute and return the byte offset of the
9686 lowest addressed byte of the "containing object" for the given FIELD_DECL,
9687 or return 0 if we are unable to determine what that offset is, either
9688 because the argument turns out to be a pointer to an ERROR_MARK node, or
9689 because the offset is actually variable. (We can't handle the latter case
9692 static HOST_WIDE_INT
9693 field_byte_offset (tree decl
)
9695 unsigned int type_align_in_bits
;
9696 unsigned int decl_align_in_bits
;
9697 unsigned HOST_WIDE_INT type_size_in_bits
;
9698 HOST_WIDE_INT object_offset_in_bits
;
9700 tree field_size_tree
;
9701 HOST_WIDE_INT bitpos_int
;
9702 HOST_WIDE_INT deepest_bitpos
;
9703 unsigned HOST_WIDE_INT field_size_in_bits
;
9705 if (TREE_CODE (decl
) == ERROR_MARK
)
9708 gcc_assert (TREE_CODE (decl
) == FIELD_DECL
);
9710 type
= field_type (decl
);
9711 field_size_tree
= DECL_SIZE (decl
);
9713 /* The size could be unspecified if there was an error, or for
9714 a flexible array member. */
9715 if (! field_size_tree
)
9716 field_size_tree
= bitsize_zero_node
;
9718 /* We cannot yet cope with fields whose positions are variable, so
9719 for now, when we see such things, we simply return 0. Someday, we may
9720 be able to handle such cases, but it will be damn difficult. */
9721 if (! host_integerp (bit_position (decl
), 0))
9724 bitpos_int
= int_bit_position (decl
);
9726 /* If we don't know the size of the field, pretend it's a full word. */
9727 if (host_integerp (field_size_tree
, 1))
9728 field_size_in_bits
= tree_low_cst (field_size_tree
, 1);
9730 field_size_in_bits
= BITS_PER_WORD
;
9732 type_size_in_bits
= simple_type_size_in_bits (type
);
9733 type_align_in_bits
= simple_type_align_in_bits (type
);
9734 decl_align_in_bits
= simple_decl_align_in_bits (decl
);
9736 /* The GCC front-end doesn't make any attempt to keep track of the starting
9737 bit offset (relative to the start of the containing structure type) of the
9738 hypothetical "containing object" for a bit-field. Thus, when computing
9739 the byte offset value for the start of the "containing object" of a
9740 bit-field, we must deduce this information on our own. This can be rather
9741 tricky to do in some cases. For example, handling the following structure
9742 type definition when compiling for an i386/i486 target (which only aligns
9743 long long's to 32-bit boundaries) can be very tricky:
9745 struct S { int field1; long long field2:31; };
9747 Fortunately, there is a simple rule-of-thumb which can be used in such
9748 cases. When compiling for an i386/i486, GCC will allocate 8 bytes for the
9749 structure shown above. It decides to do this based upon one simple rule
9750 for bit-field allocation. GCC allocates each "containing object" for each
9751 bit-field at the first (i.e. lowest addressed) legitimate alignment
9752 boundary (based upon the required minimum alignment for the declared type
9753 of the field) which it can possibly use, subject to the condition that
9754 there is still enough available space remaining in the containing object
9755 (when allocated at the selected point) to fully accommodate all of the
9756 bits of the bit-field itself.
9758 This simple rule makes it obvious why GCC allocates 8 bytes for each
9759 object of the structure type shown above. When looking for a place to
9760 allocate the "containing object" for `field2', the compiler simply tries
9761 to allocate a 64-bit "containing object" at each successive 32-bit
9762 boundary (starting at zero) until it finds a place to allocate that 64-
9763 bit field such that at least 31 contiguous (and previously unallocated)
9764 bits remain within that selected 64 bit field. (As it turns out, for the
9765 example above, the compiler finds it is OK to allocate the "containing
9766 object" 64-bit field at bit-offset zero within the structure type.)
9768 Here we attempt to work backwards from the limited set of facts we're
9769 given, and we try to deduce from those facts, where GCC must have believed
9770 that the containing object started (within the structure type). The value
9771 we deduce is then used (by the callers of this routine) to generate
9772 DW_AT_location and DW_AT_bit_offset attributes for fields (both bit-fields
9773 and, in the case of DW_AT_location, regular fields as well). */
9775 /* Figure out the bit-distance from the start of the structure to the
9776 "deepest" bit of the bit-field. */
9777 deepest_bitpos
= bitpos_int
+ field_size_in_bits
;
9779 /* This is the tricky part. Use some fancy footwork to deduce where the
9780 lowest addressed bit of the containing object must be. */
9781 object_offset_in_bits
= deepest_bitpos
- type_size_in_bits
;
9783 /* Round up to type_align by default. This works best for bitfields. */
9784 object_offset_in_bits
9785 = round_up_to_align (object_offset_in_bits
, type_align_in_bits
);
9787 if (object_offset_in_bits
> bitpos_int
)
9789 /* Sigh, the decl must be packed. */
9790 object_offset_in_bits
= deepest_bitpos
- type_size_in_bits
;
9792 /* Round up to decl_align instead. */
9793 object_offset_in_bits
9794 = round_up_to_align (object_offset_in_bits
, decl_align_in_bits
);
9797 return object_offset_in_bits
/ BITS_PER_UNIT
;
9800 /* The following routines define various Dwarf attributes and any data
9801 associated with them. */
9803 /* Add a location description attribute value to a DIE.
9805 This emits location attributes suitable for whole variables and
9806 whole parameters. Note that the location attributes for struct fields are
9807 generated by the routine `data_member_location_attribute' below. */
9810 add_AT_location_description (dw_die_ref die
, enum dwarf_attribute attr_kind
,
9811 dw_loc_descr_ref descr
)
9814 add_AT_loc (die
, attr_kind
, descr
);
9817 /* Attach the specialized form of location attribute used for data members of
9818 struct and union types. In the special case of a FIELD_DECL node which
9819 represents a bit-field, the "offset" part of this special location
9820 descriptor must indicate the distance in bytes from the lowest-addressed
9821 byte of the containing struct or union type to the lowest-addressed byte of
9822 the "containing object" for the bit-field. (See the `field_byte_offset'
9825 For any given bit-field, the "containing object" is a hypothetical object
9826 (of some integral or enum type) within which the given bit-field lives. The
9827 type of this hypothetical "containing object" is always the same as the
9828 declared type of the individual bit-field itself (for GCC anyway... the
9829 DWARF spec doesn't actually mandate this). Note that it is the size (in
9830 bytes) of the hypothetical "containing object" which will be given in the
9831 DW_AT_byte_size attribute for this bit-field. (See the
9832 `byte_size_attribute' function below.) It is also used when calculating the
9833 value of the DW_AT_bit_offset attribute. (See the `bit_offset_attribute'
9837 add_data_member_location_attribute (dw_die_ref die
, tree decl
)
9839 HOST_WIDE_INT offset
;
9840 dw_loc_descr_ref loc_descr
= 0;
9842 if (TREE_CODE (decl
) == TREE_BINFO
)
9844 /* We're working on the TAG_inheritance for a base class. */
9845 if (BINFO_VIRTUAL_P (decl
) && is_cxx ())
9847 /* For C++ virtual bases we can't just use BINFO_OFFSET, as they
9848 aren't at a fixed offset from all (sub)objects of the same
9849 type. We need to extract the appropriate offset from our
9850 vtable. The following dwarf expression means
9852 BaseAddr = ObAddr + *((*ObAddr) - Offset)
9854 This is specific to the V3 ABI, of course. */
9856 dw_loc_descr_ref tmp
;
9858 /* Make a copy of the object address. */
9859 tmp
= new_loc_descr (DW_OP_dup
, 0, 0);
9860 add_loc_descr (&loc_descr
, tmp
);
9862 /* Extract the vtable address. */
9863 tmp
= new_loc_descr (DW_OP_deref
, 0, 0);
9864 add_loc_descr (&loc_descr
, tmp
);
9866 /* Calculate the address of the offset. */
9867 offset
= tree_low_cst (BINFO_VPTR_FIELD (decl
), 0);
9868 gcc_assert (offset
< 0);
9870 tmp
= int_loc_descriptor (-offset
);
9871 add_loc_descr (&loc_descr
, tmp
);
9872 tmp
= new_loc_descr (DW_OP_minus
, 0, 0);
9873 add_loc_descr (&loc_descr
, tmp
);
9875 /* Extract the offset. */
9876 tmp
= new_loc_descr (DW_OP_deref
, 0, 0);
9877 add_loc_descr (&loc_descr
, tmp
);
9879 /* Add it to the object address. */
9880 tmp
= new_loc_descr (DW_OP_plus
, 0, 0);
9881 add_loc_descr (&loc_descr
, tmp
);
9884 offset
= tree_low_cst (BINFO_OFFSET (decl
), 0);
9887 offset
= field_byte_offset (decl
);
9891 enum dwarf_location_atom op
;
9893 /* The DWARF2 standard says that we should assume that the structure
9894 address is already on the stack, so we can specify a structure field
9895 address by using DW_OP_plus_uconst. */
9897 #ifdef MIPS_DEBUGGING_INFO
9898 /* ??? The SGI dwarf reader does not handle the DW_OP_plus_uconst
9899 operator correctly. It works only if we leave the offset on the
9903 op
= DW_OP_plus_uconst
;
9906 loc_descr
= new_loc_descr (op
, offset
, 0);
9909 add_AT_loc (die
, DW_AT_data_member_location
, loc_descr
);
9912 /* Writes integer values to dw_vec_const array. */
9915 insert_int (HOST_WIDE_INT val
, unsigned int size
, unsigned char *dest
)
9919 *dest
++ = val
& 0xff;
9925 /* Reads integers from dw_vec_const array. Inverse of insert_int. */
9927 static HOST_WIDE_INT
9928 extract_int (const unsigned char *src
, unsigned int size
)
9930 HOST_WIDE_INT val
= 0;
9936 val
|= *--src
& 0xff;
9942 /* Writes floating point values to dw_vec_const array. */
9945 insert_float (rtx rtl
, unsigned char *array
)
9951 REAL_VALUE_FROM_CONST_DOUBLE (rv
, rtl
);
9952 real_to_target (val
, &rv
, GET_MODE (rtl
));
9954 /* real_to_target puts 32-bit pieces in each long. Pack them. */
9955 for (i
= 0; i
< GET_MODE_SIZE (GET_MODE (rtl
)) / 4; i
++)
9957 insert_int (val
[i
], 4, array
);
9962 /* Attach a DW_AT_const_value attribute for a variable or a parameter which
9963 does not have a "location" either in memory or in a register. These
9964 things can arise in GNU C when a constant is passed as an actual parameter
9965 to an inlined function. They can also arise in C++ where declared
9966 constants do not necessarily get memory "homes". */
9969 add_const_value_attribute (dw_die_ref die
, rtx rtl
)
9971 switch (GET_CODE (rtl
))
9975 HOST_WIDE_INT val
= INTVAL (rtl
);
9978 add_AT_int (die
, DW_AT_const_value
, val
);
9980 add_AT_unsigned (die
, DW_AT_const_value
, (unsigned HOST_WIDE_INT
) val
);
9985 /* Note that a CONST_DOUBLE rtx could represent either an integer or a
9986 floating-point constant. A CONST_DOUBLE is used whenever the
9987 constant requires more than one word in order to be adequately
9988 represented. We output CONST_DOUBLEs as blocks. */
9990 enum machine_mode mode
= GET_MODE (rtl
);
9992 if (SCALAR_FLOAT_MODE_P (mode
))
9994 unsigned int length
= GET_MODE_SIZE (mode
);
9995 unsigned char *array
= ggc_alloc (length
);
9997 insert_float (rtl
, array
);
9998 add_AT_vec (die
, DW_AT_const_value
, length
/ 4, 4, array
);
10002 /* ??? We really should be using HOST_WIDE_INT throughout. */
10003 gcc_assert (HOST_BITS_PER_LONG
== HOST_BITS_PER_WIDE_INT
);
10005 add_AT_long_long (die
, DW_AT_const_value
,
10006 CONST_DOUBLE_HIGH (rtl
), CONST_DOUBLE_LOW (rtl
));
10013 enum machine_mode mode
= GET_MODE (rtl
);
10014 unsigned int elt_size
= GET_MODE_UNIT_SIZE (mode
);
10015 unsigned int length
= CONST_VECTOR_NUNITS (rtl
);
10016 unsigned char *array
= ggc_alloc (length
* elt_size
);
10020 switch (GET_MODE_CLASS (mode
))
10022 case MODE_VECTOR_INT
:
10023 for (i
= 0, p
= array
; i
< length
; i
++, p
+= elt_size
)
10025 rtx elt
= CONST_VECTOR_ELT (rtl
, i
);
10026 HOST_WIDE_INT lo
, hi
;
10028 switch (GET_CODE (elt
))
10036 lo
= CONST_DOUBLE_LOW (elt
);
10037 hi
= CONST_DOUBLE_HIGH (elt
);
10041 gcc_unreachable ();
10044 if (elt_size
<= sizeof (HOST_WIDE_INT
))
10045 insert_int (lo
, elt_size
, p
);
10048 unsigned char *p0
= p
;
10049 unsigned char *p1
= p
+ sizeof (HOST_WIDE_INT
);
10051 gcc_assert (elt_size
== 2 * sizeof (HOST_WIDE_INT
));
10052 if (WORDS_BIG_ENDIAN
)
10057 insert_int (lo
, sizeof (HOST_WIDE_INT
), p0
);
10058 insert_int (hi
, sizeof (HOST_WIDE_INT
), p1
);
10063 case MODE_VECTOR_FLOAT
:
10064 for (i
= 0, p
= array
; i
< length
; i
++, p
+= elt_size
)
10066 rtx elt
= CONST_VECTOR_ELT (rtl
, i
);
10067 insert_float (elt
, p
);
10072 gcc_unreachable ();
10075 add_AT_vec (die
, DW_AT_const_value
, length
, elt_size
, array
);
10080 add_AT_string (die
, DW_AT_const_value
, XSTR (rtl
, 0));
10086 add_AT_addr (die
, DW_AT_const_value
, rtl
);
10087 VEC_safe_push (rtx
, gc
, used_rtx_array
, rtl
);
10091 /* In cases where an inlined instance of an inline function is passed
10092 the address of an `auto' variable (which is local to the caller) we
10093 can get a situation where the DECL_RTL of the artificial local
10094 variable (for the inlining) which acts as a stand-in for the
10095 corresponding formal parameter (of the inline function) will look
10096 like (plus:SI (reg:SI FRAME_PTR) (const_int ...)). This is not
10097 exactly a compile-time constant expression, but it isn't the address
10098 of the (artificial) local variable either. Rather, it represents the
10099 *value* which the artificial local variable always has during its
10100 lifetime. We currently have no way to represent such quasi-constant
10101 values in Dwarf, so for now we just punt and generate nothing. */
10105 /* No other kinds of rtx should be possible here. */
10106 gcc_unreachable ();
10111 /* Determine whether the evaluation of EXPR references any variables
10112 or functions which aren't otherwise used (and therefore may not be
10115 reference_to_unused (tree
* tp
, int * walk_subtrees
,
10116 void * data ATTRIBUTE_UNUSED
)
10118 if (! EXPR_P (*tp
) && ! GIMPLE_STMT_P (*tp
) && ! CONSTANT_CLASS_P (*tp
))
10119 *walk_subtrees
= 0;
10121 if (DECL_P (*tp
) && ! TREE_PUBLIC (*tp
) && ! TREE_USED (*tp
)
10122 && ! TREE_ASM_WRITTEN (*tp
))
10124 else if (!flag_unit_at_a_time
)
10126 else if (!cgraph_global_info_ready
10127 && (TREE_CODE (*tp
) == VAR_DECL
|| TREE_CODE (*tp
) == FUNCTION_DECL
))
10128 gcc_unreachable ();
10129 else if (DECL_P (*tp
) && TREE_CODE (*tp
) == VAR_DECL
)
10131 struct varpool_node
*node
= varpool_node (*tp
);
10135 else if (DECL_P (*tp
) && TREE_CODE (*tp
) == FUNCTION_DECL
10136 && (!DECL_EXTERNAL (*tp
) || DECL_DECLARED_INLINE_P (*tp
)))
10138 struct cgraph_node
*node
= cgraph_node (*tp
);
10146 /* Generate an RTL constant from a decl initializer INIT with decl type TYPE,
10147 for use in a later add_const_value_attribute call. */
10150 rtl_for_decl_init (tree init
, tree type
)
10152 rtx rtl
= NULL_RTX
;
10154 /* If a variable is initialized with a string constant without embedded
10155 zeros, build CONST_STRING. */
10156 if (TREE_CODE (init
) == STRING_CST
&& TREE_CODE (type
) == ARRAY_TYPE
)
10158 tree enttype
= TREE_TYPE (type
);
10159 tree domain
= TYPE_DOMAIN (type
);
10160 enum machine_mode mode
= TYPE_MODE (enttype
);
10162 if (GET_MODE_CLASS (mode
) == MODE_INT
&& GET_MODE_SIZE (mode
) == 1
10164 && integer_zerop (TYPE_MIN_VALUE (domain
))
10165 && compare_tree_int (TYPE_MAX_VALUE (domain
),
10166 TREE_STRING_LENGTH (init
) - 1) == 0
10167 && ((size_t) TREE_STRING_LENGTH (init
)
10168 == strlen (TREE_STRING_POINTER (init
)) + 1))
10169 rtl
= gen_rtx_CONST_STRING (VOIDmode
,
10170 ggc_strdup (TREE_STRING_POINTER (init
)));
10172 /* Other aggregates, and complex values, could be represented using
10174 else if (AGGREGATE_TYPE_P (type
) || TREE_CODE (type
) == COMPLEX_TYPE
)
10176 /* Vectors only work if their mode is supported by the target.
10177 FIXME: generic vectors ought to work too. */
10178 else if (TREE_CODE (type
) == VECTOR_TYPE
&& TYPE_MODE (type
) == BLKmode
)
10180 /* If the initializer is something that we know will expand into an
10181 immediate RTL constant, expand it now. We must be careful not to
10182 reference variables which won't be output. */
10183 else if (initializer_constant_valid_p (init
, type
)
10184 && ! walk_tree (&init
, reference_to_unused
, NULL
, NULL
))
10186 rtl
= expand_expr (init
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
10188 /* If expand_expr returns a MEM, it wasn't immediate. */
10189 gcc_assert (!rtl
|| !MEM_P (rtl
));
10195 /* Generate RTL for the variable DECL to represent its location. */
10198 rtl_for_decl_location (tree decl
)
10202 /* Here we have to decide where we are going to say the parameter "lives"
10203 (as far as the debugger is concerned). We only have a couple of
10204 choices. GCC provides us with DECL_RTL and with DECL_INCOMING_RTL.
10206 DECL_RTL normally indicates where the parameter lives during most of the
10207 activation of the function. If optimization is enabled however, this
10208 could be either NULL or else a pseudo-reg. Both of those cases indicate
10209 that the parameter doesn't really live anywhere (as far as the code
10210 generation parts of GCC are concerned) during most of the function's
10211 activation. That will happen (for example) if the parameter is never
10212 referenced within the function.
10214 We could just generate a location descriptor here for all non-NULL
10215 non-pseudo values of DECL_RTL and ignore all of the rest, but we can be
10216 a little nicer than that if we also consider DECL_INCOMING_RTL in cases
10217 where DECL_RTL is NULL or is a pseudo-reg.
10219 Note however that we can only get away with using DECL_INCOMING_RTL as
10220 a backup substitute for DECL_RTL in certain limited cases. In cases
10221 where DECL_ARG_TYPE (decl) indicates the same type as TREE_TYPE (decl),
10222 we can be sure that the parameter was passed using the same type as it is
10223 declared to have within the function, and that its DECL_INCOMING_RTL
10224 points us to a place where a value of that type is passed.
10226 In cases where DECL_ARG_TYPE (decl) and TREE_TYPE (decl) are different,
10227 we cannot (in general) use DECL_INCOMING_RTL as a substitute for DECL_RTL
10228 because in these cases DECL_INCOMING_RTL points us to a value of some
10229 type which is *different* from the type of the parameter itself. Thus,
10230 if we tried to use DECL_INCOMING_RTL to generate a location attribute in
10231 such cases, the debugger would end up (for example) trying to fetch a
10232 `float' from a place which actually contains the first part of a
10233 `double'. That would lead to really incorrect and confusing
10234 output at debug-time.
10236 So, in general, we *do not* use DECL_INCOMING_RTL as a backup for DECL_RTL
10237 in cases where DECL_ARG_TYPE (decl) != TREE_TYPE (decl). There
10238 are a couple of exceptions however. On little-endian machines we can
10239 get away with using DECL_INCOMING_RTL even when DECL_ARG_TYPE (decl) is
10240 not the same as TREE_TYPE (decl), but only when DECL_ARG_TYPE (decl) is
10241 an integral type that is smaller than TREE_TYPE (decl). These cases arise
10242 when (on a little-endian machine) a non-prototyped function has a
10243 parameter declared to be of type `short' or `char'. In such cases,
10244 TREE_TYPE (decl) will be `short' or `char', DECL_ARG_TYPE (decl) will
10245 be `int', and DECL_INCOMING_RTL will point to the lowest-order byte of the
10246 passed `int' value. If the debugger then uses that address to fetch
10247 a `short' or a `char' (on a little-endian machine) the result will be
10248 the correct data, so we allow for such exceptional cases below.
10250 Note that our goal here is to describe the place where the given formal
10251 parameter lives during most of the function's activation (i.e. between the
10252 end of the prologue and the start of the epilogue). We'll do that as best
10253 as we can. Note however that if the given formal parameter is modified
10254 sometime during the execution of the function, then a stack backtrace (at
10255 debug-time) will show the function as having been called with the *new*
10256 value rather than the value which was originally passed in. This happens
10257 rarely enough that it is not a major problem, but it *is* a problem, and
10258 I'd like to fix it.
10260 A future version of dwarf2out.c may generate two additional attributes for
10261 any given DW_TAG_formal_parameter DIE which will describe the "passed
10262 type" and the "passed location" for the given formal parameter in addition
10263 to the attributes we now generate to indicate the "declared type" and the
10264 "active location" for each parameter. This additional set of attributes
10265 could be used by debuggers for stack backtraces. Separately, note that
10266 sometimes DECL_RTL can be NULL and DECL_INCOMING_RTL can be NULL also.
10267 This happens (for example) for inlined-instances of inline function formal
10268 parameters which are never referenced. This really shouldn't be
10269 happening. All PARM_DECL nodes should get valid non-NULL
10270 DECL_INCOMING_RTL values. FIXME. */
10272 /* Use DECL_RTL as the "location" unless we find something better. */
10273 rtl
= DECL_RTL_IF_SET (decl
);
10275 /* When generating abstract instances, ignore everything except
10276 constants, symbols living in memory, and symbols living in
10277 fixed registers. */
10278 if (! reload_completed
)
10281 && (CONSTANT_P (rtl
)
10283 && CONSTANT_P (XEXP (rtl
, 0)))
10285 && TREE_CODE (decl
) == VAR_DECL
10286 && TREE_STATIC (decl
))))
10288 rtl
= targetm
.delegitimize_address (rtl
);
10293 else if (TREE_CODE (decl
) == PARM_DECL
)
10295 if (rtl
== NULL_RTX
|| is_pseudo_reg (rtl
))
10297 tree declared_type
= TREE_TYPE (decl
);
10298 tree passed_type
= DECL_ARG_TYPE (decl
);
10299 enum machine_mode dmode
= TYPE_MODE (declared_type
);
10300 enum machine_mode pmode
= TYPE_MODE (passed_type
);
10302 /* This decl represents a formal parameter which was optimized out.
10303 Note that DECL_INCOMING_RTL may be NULL in here, but we handle
10304 all cases where (rtl == NULL_RTX) just below. */
10305 if (dmode
== pmode
)
10306 rtl
= DECL_INCOMING_RTL (decl
);
10307 else if (SCALAR_INT_MODE_P (dmode
)
10308 && GET_MODE_SIZE (dmode
) <= GET_MODE_SIZE (pmode
)
10309 && DECL_INCOMING_RTL (decl
))
10311 rtx inc
= DECL_INCOMING_RTL (decl
);
10314 else if (MEM_P (inc
))
10316 if (BYTES_BIG_ENDIAN
)
10317 rtl
= adjust_address_nv (inc
, dmode
,
10318 GET_MODE_SIZE (pmode
)
10319 - GET_MODE_SIZE (dmode
));
10326 /* If the parm was passed in registers, but lives on the stack, then
10327 make a big endian correction if the mode of the type of the
10328 parameter is not the same as the mode of the rtl. */
10329 /* ??? This is the same series of checks that are made in dbxout.c before
10330 we reach the big endian correction code there. It isn't clear if all
10331 of these checks are necessary here, but keeping them all is the safe
10333 else if (MEM_P (rtl
)
10334 && XEXP (rtl
, 0) != const0_rtx
10335 && ! CONSTANT_P (XEXP (rtl
, 0))
10336 /* Not passed in memory. */
10337 && !MEM_P (DECL_INCOMING_RTL (decl
))
10338 /* Not passed by invisible reference. */
10339 && (!REG_P (XEXP (rtl
, 0))
10340 || REGNO (XEXP (rtl
, 0)) == HARD_FRAME_POINTER_REGNUM
10341 || REGNO (XEXP (rtl
, 0)) == STACK_POINTER_REGNUM
10342 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
10343 || REGNO (XEXP (rtl
, 0)) == ARG_POINTER_REGNUM
10346 /* Big endian correction check. */
10347 && BYTES_BIG_ENDIAN
10348 && TYPE_MODE (TREE_TYPE (decl
)) != GET_MODE (rtl
)
10349 && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (decl
)))
10352 int offset
= (UNITS_PER_WORD
10353 - GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (decl
))));
10355 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (decl
)),
10356 plus_constant (XEXP (rtl
, 0), offset
));
10359 else if (TREE_CODE (decl
) == VAR_DECL
10362 && GET_MODE (rtl
) != TYPE_MODE (TREE_TYPE (decl
))
10363 && BYTES_BIG_ENDIAN
)
10365 int rsize
= GET_MODE_SIZE (GET_MODE (rtl
));
10366 int dsize
= GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (decl
)));
10368 /* If a variable is declared "register" yet is smaller than
10369 a register, then if we store the variable to memory, it
10370 looks like we're storing a register-sized value, when in
10371 fact we are not. We need to adjust the offset of the
10372 storage location to reflect the actual value's bytes,
10373 else gdb will not be able to display it. */
10375 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (decl
)),
10376 plus_constant (XEXP (rtl
, 0), rsize
-dsize
));
10379 /* A variable with no DECL_RTL but a DECL_INITIAL is a compile-time constant,
10380 and will have been substituted directly into all expressions that use it.
10381 C does not have such a concept, but C++ and other languages do. */
10382 if (!rtl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_INITIAL (decl
))
10383 rtl
= rtl_for_decl_init (DECL_INITIAL (decl
), TREE_TYPE (decl
));
10386 rtl
= targetm
.delegitimize_address (rtl
);
10388 /* If we don't look past the constant pool, we risk emitting a
10389 reference to a constant pool entry that isn't referenced from
10390 code, and thus is not emitted. */
10392 rtl
= avoid_constant_pool_reference (rtl
);
10397 /* We need to figure out what section we should use as the base for the
10398 address ranges where a given location is valid.
10399 1. If this particular DECL has a section associated with it, use that.
10400 2. If this function has a section associated with it, use that.
10401 3. Otherwise, use the text section.
10402 XXX: If you split a variable across multiple sections, we won't notice. */
10404 static const char *
10405 secname_for_decl (tree decl
)
10407 const char *secname
;
10409 if (VAR_OR_FUNCTION_DECL_P (decl
) && DECL_SECTION_NAME (decl
))
10411 tree sectree
= DECL_SECTION_NAME (decl
);
10412 secname
= TREE_STRING_POINTER (sectree
);
10414 else if (current_function_decl
&& DECL_SECTION_NAME (current_function_decl
))
10416 tree sectree
= DECL_SECTION_NAME (current_function_decl
);
10417 secname
= TREE_STRING_POINTER (sectree
);
10419 else if (cfun
&& in_cold_section_p
)
10420 secname
= cfun
->cold_section_label
;
10422 secname
= text_section_label
;
10427 /* Generate *either* a DW_AT_location attribute or else a DW_AT_const_value
10428 data attribute for a variable or a parameter. We generate the
10429 DW_AT_const_value attribute only in those cases where the given variable
10430 or parameter does not have a true "location" either in memory or in a
10431 register. This can happen (for example) when a constant is passed as an
10432 actual argument in a call to an inline function. (It's possible that
10433 these things can crop up in other ways also.) Note that one type of
10434 constant value which can be passed into an inlined function is a constant
10435 pointer. This can happen for example if an actual argument in an inlined
10436 function call evaluates to a compile-time constant address. */
10439 add_location_or_const_value_attribute (dw_die_ref die
, tree decl
,
10440 enum dwarf_attribute attr
)
10443 dw_loc_descr_ref descr
;
10444 var_loc_list
*loc_list
;
10445 struct var_loc_node
*node
;
10446 if (TREE_CODE (decl
) == ERROR_MARK
)
10449 gcc_assert (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
10450 || TREE_CODE (decl
) == RESULT_DECL
);
10452 /* See if we possibly have multiple locations for this variable. */
10453 loc_list
= lookup_decl_loc (decl
);
10455 /* If it truly has multiple locations, the first and last node will
10457 if (loc_list
&& loc_list
->first
!= loc_list
->last
)
10459 const char *endname
, *secname
;
10460 dw_loc_list_ref list
;
10463 /* Now that we know what section we are using for a base,
10464 actually construct the list of locations.
10465 The first location information is what is passed to the
10466 function that creates the location list, and the remaining
10467 locations just get added on to that list.
10468 Note that we only know the start address for a location
10469 (IE location changes), so to build the range, we use
10470 the range [current location start, next location start].
10471 This means we have to special case the last node, and generate
10472 a range of [last location start, end of function label]. */
10474 node
= loc_list
->first
;
10475 varloc
= NOTE_VAR_LOCATION (node
->var_loc_note
);
10476 secname
= secname_for_decl (decl
);
10478 list
= new_loc_list (loc_descriptor (varloc
),
10479 node
->label
, node
->next
->label
, secname
, 1);
10482 for (; node
->next
; node
= node
->next
)
10483 if (NOTE_VAR_LOCATION_LOC (node
->var_loc_note
) != NULL_RTX
)
10485 /* The variable has a location between NODE->LABEL and
10486 NODE->NEXT->LABEL. */
10487 varloc
= NOTE_VAR_LOCATION (node
->var_loc_note
);
10488 add_loc_descr_to_loc_list (&list
, loc_descriptor (varloc
),
10489 node
->label
, node
->next
->label
, secname
);
10492 /* If the variable has a location at the last label
10493 it keeps its location until the end of function. */
10494 if (NOTE_VAR_LOCATION_LOC (node
->var_loc_note
) != NULL_RTX
)
10496 char label_id
[MAX_ARTIFICIAL_LABEL_BYTES
];
10498 varloc
= NOTE_VAR_LOCATION (node
->var_loc_note
);
10499 if (!current_function_decl
)
10500 endname
= text_end_label
;
10503 ASM_GENERATE_INTERNAL_LABEL (label_id
, FUNC_END_LABEL
,
10504 current_function_funcdef_no
);
10505 endname
= ggc_strdup (label_id
);
10507 add_loc_descr_to_loc_list (&list
, loc_descriptor (varloc
),
10508 node
->label
, endname
, secname
);
10511 /* Finally, add the location list to the DIE, and we are done. */
10512 add_AT_loc_list (die
, attr
, list
);
10516 /* Try to get some constant RTL for this decl, and use that as the value of
10519 rtl
= rtl_for_decl_location (decl
);
10520 if (rtl
&& (CONSTANT_P (rtl
) || GET_CODE (rtl
) == CONST_STRING
))
10522 add_const_value_attribute (die
, rtl
);
10526 /* If we have tried to generate the location otherwise, and it
10527 didn't work out (we wouldn't be here if we did), and we have a one entry
10528 location list, try generating a location from that. */
10529 if (loc_list
&& loc_list
->first
)
10531 node
= loc_list
->first
;
10532 descr
= loc_descriptor (NOTE_VAR_LOCATION (node
->var_loc_note
));
10535 add_AT_location_description (die
, attr
, descr
);
10540 /* We couldn't get any rtl, so try directly generating the location
10541 description from the tree. */
10542 descr
= loc_descriptor_from_tree (decl
);
10545 add_AT_location_description (die
, attr
, descr
);
10548 /* None of that worked, so it must not really have a location;
10549 try adding a constant value attribute from the DECL_INITIAL. */
10550 tree_add_const_value_attribute (die
, decl
);
10553 /* If we don't have a copy of this variable in memory for some reason (such
10554 as a C++ member constant that doesn't have an out-of-line definition),
10555 we should tell the debugger about the constant value. */
10558 tree_add_const_value_attribute (dw_die_ref var_die
, tree decl
)
10560 tree init
= DECL_INITIAL (decl
);
10561 tree type
= TREE_TYPE (decl
);
10564 if (TREE_READONLY (decl
) && ! TREE_THIS_VOLATILE (decl
) && init
)
10569 rtl
= rtl_for_decl_init (init
, type
);
10571 add_const_value_attribute (var_die
, rtl
);
10574 /* Convert the CFI instructions for the current function into a
10575 location list. This is used for DW_AT_frame_base when we targeting
10576 a dwarf2 consumer that does not support the dwarf3
10577 DW_OP_call_frame_cfa. OFFSET is a constant to be added to all CFA
10580 static dw_loc_list_ref
10581 convert_cfa_to_fb_loc_list (HOST_WIDE_INT offset
)
10584 dw_loc_list_ref list
, *list_tail
;
10586 dw_cfa_location last_cfa
, next_cfa
;
10587 const char *start_label
, *last_label
, *section
;
10589 fde
= &fde_table
[fde_table_in_use
- 1];
10591 section
= secname_for_decl (current_function_decl
);
10595 next_cfa
.reg
= INVALID_REGNUM
;
10596 next_cfa
.offset
= 0;
10597 next_cfa
.indirect
= 0;
10598 next_cfa
.base_offset
= 0;
10600 start_label
= fde
->dw_fde_begin
;
10602 /* ??? Bald assumption that the CIE opcode list does not contain
10603 advance opcodes. */
10604 for (cfi
= cie_cfi_head
; cfi
; cfi
= cfi
->dw_cfi_next
)
10605 lookup_cfa_1 (cfi
, &next_cfa
);
10607 last_cfa
= next_cfa
;
10608 last_label
= start_label
;
10610 for (cfi
= fde
->dw_fde_cfi
; cfi
; cfi
= cfi
->dw_cfi_next
)
10611 switch (cfi
->dw_cfi_opc
)
10613 case DW_CFA_set_loc
:
10614 case DW_CFA_advance_loc1
:
10615 case DW_CFA_advance_loc2
:
10616 case DW_CFA_advance_loc4
:
10617 if (!cfa_equal_p (&last_cfa
, &next_cfa
))
10619 *list_tail
= new_loc_list (build_cfa_loc (&last_cfa
, offset
),
10620 start_label
, last_label
, section
,
10623 list_tail
= &(*list_tail
)->dw_loc_next
;
10624 last_cfa
= next_cfa
;
10625 start_label
= last_label
;
10627 last_label
= cfi
->dw_cfi_oprnd1
.dw_cfi_addr
;
10630 case DW_CFA_advance_loc
:
10631 /* The encoding is complex enough that we should never emit this. */
10632 case DW_CFA_remember_state
:
10633 case DW_CFA_restore_state
:
10634 /* We don't handle these two in this function. It would be possible
10635 if it were to be required. */
10636 gcc_unreachable ();
10639 lookup_cfa_1 (cfi
, &next_cfa
);
10643 if (!cfa_equal_p (&last_cfa
, &next_cfa
))
10645 *list_tail
= new_loc_list (build_cfa_loc (&last_cfa
, offset
),
10646 start_label
, last_label
, section
,
10648 list_tail
= &(*list_tail
)->dw_loc_next
;
10649 start_label
= last_label
;
10651 *list_tail
= new_loc_list (build_cfa_loc (&next_cfa
, offset
),
10652 start_label
, fde
->dw_fde_end
, section
,
10658 /* Compute a displacement from the "steady-state frame pointer" to the
10659 frame base (often the same as the CFA), and store it in
10660 frame_pointer_fb_offset. OFFSET is added to the displacement
10661 before the latter is negated. */
10664 compute_frame_pointer_to_fb_displacement (HOST_WIDE_INT offset
)
10668 #ifdef FRAME_POINTER_CFA_OFFSET
10669 reg
= frame_pointer_rtx
;
10670 offset
+= FRAME_POINTER_CFA_OFFSET (current_function_decl
);
10672 reg
= arg_pointer_rtx
;
10673 offset
+= ARG_POINTER_CFA_OFFSET (current_function_decl
);
10676 elim
= eliminate_regs (reg
, VOIDmode
, NULL_RTX
);
10677 if (GET_CODE (elim
) == PLUS
)
10679 offset
+= INTVAL (XEXP (elim
, 1));
10680 elim
= XEXP (elim
, 0);
10682 gcc_assert (elim
== (frame_pointer_needed
? hard_frame_pointer_rtx
10683 : stack_pointer_rtx
));
10685 frame_pointer_fb_offset
= -offset
;
10688 /* Generate a DW_AT_name attribute given some string value to be included as
10689 the value of the attribute. */
10692 add_name_attribute (dw_die_ref die
, const char *name_string
)
10694 if (name_string
!= NULL
&& *name_string
!= 0)
10696 if (demangle_name_func
)
10697 name_string
= (*demangle_name_func
) (name_string
);
10699 add_AT_string (die
, DW_AT_name
, name_string
);
10703 /* Generate a DW_AT_comp_dir attribute for DIE. */
10706 add_comp_dir_attribute (dw_die_ref die
)
10708 const char *wd
= get_src_pwd ();
10710 add_AT_string (die
, DW_AT_comp_dir
, wd
);
10713 /* Given a tree node describing an array bound (either lower or upper) output
10714 a representation for that bound. */
10717 add_bound_info (dw_die_ref subrange_die
, enum dwarf_attribute bound_attr
, tree bound
)
10719 switch (TREE_CODE (bound
))
10724 /* All fixed-bounds are represented by INTEGER_CST nodes. */
10726 if (! host_integerp (bound
, 0)
10727 || (bound_attr
== DW_AT_lower_bound
10728 && (((is_c_family () || is_java ()) && integer_zerop (bound
))
10729 || (is_fortran () && integer_onep (bound
)))))
10730 /* Use the default. */
10733 add_AT_unsigned (subrange_die
, bound_attr
, tree_low_cst (bound
, 0));
10738 case NON_LVALUE_EXPR
:
10739 case VIEW_CONVERT_EXPR
:
10740 add_bound_info (subrange_die
, bound_attr
, TREE_OPERAND (bound
, 0));
10750 dw_die_ref decl_die
= lookup_decl_die (bound
);
10752 /* ??? Can this happen, or should the variable have been bound
10753 first? Probably it can, since I imagine that we try to create
10754 the types of parameters in the order in which they exist in
10755 the list, and won't have created a forward reference to a
10756 later parameter. */
10757 if (decl_die
!= NULL
)
10758 add_AT_die_ref (subrange_die
, bound_attr
, decl_die
);
10764 /* Otherwise try to create a stack operation procedure to
10765 evaluate the value of the array bound. */
10767 dw_die_ref ctx
, decl_die
;
10768 dw_loc_descr_ref loc
;
10770 loc
= loc_descriptor_from_tree (bound
);
10774 if (current_function_decl
== 0)
10775 ctx
= comp_unit_die
;
10777 ctx
= lookup_decl_die (current_function_decl
);
10779 decl_die
= new_die (DW_TAG_variable
, ctx
, bound
);
10780 add_AT_flag (decl_die
, DW_AT_artificial
, 1);
10781 add_type_attribute (decl_die
, TREE_TYPE (bound
), 1, 0, ctx
);
10782 add_AT_loc (decl_die
, DW_AT_location
, loc
);
10784 add_AT_die_ref (subrange_die
, bound_attr
, decl_die
);
10790 /* Note that the block of subscript information for an array type also
10791 includes information about the element type of type given array type. */
10794 add_subscript_info (dw_die_ref type_die
, tree type
)
10796 #ifndef MIPS_DEBUGGING_INFO
10797 unsigned dimension_number
;
10800 dw_die_ref subrange_die
;
10802 /* The GNU compilers represent multidimensional array types as sequences of
10803 one dimensional array types whose element types are themselves array
10804 types. Here we squish that down, so that each multidimensional array
10805 type gets only one array_type DIE in the Dwarf debugging info. The draft
10806 Dwarf specification say that we are allowed to do this kind of
10807 compression in C (because there is no difference between an array or
10808 arrays and a multidimensional array in C) but for other source languages
10809 (e.g. Ada) we probably shouldn't do this. */
10811 /* ??? The SGI dwarf reader fails for multidimensional arrays with a
10812 const enum type. E.g. const enum machine_mode insn_operand_mode[2][10].
10813 We work around this by disabling this feature. See also
10814 gen_array_type_die. */
10815 #ifndef MIPS_DEBUGGING_INFO
10816 for (dimension_number
= 0;
10817 TREE_CODE (type
) == ARRAY_TYPE
;
10818 type
= TREE_TYPE (type
), dimension_number
++)
10821 tree domain
= TYPE_DOMAIN (type
);
10823 /* Arrays come in three flavors: Unspecified bounds, fixed bounds,
10824 and (in GNU C only) variable bounds. Handle all three forms
10826 subrange_die
= new_die (DW_TAG_subrange_type
, type_die
, NULL
);
10829 /* We have an array type with specified bounds. */
10830 lower
= TYPE_MIN_VALUE (domain
);
10831 upper
= TYPE_MAX_VALUE (domain
);
10833 /* Define the index type. */
10834 if (TREE_TYPE (domain
))
10836 /* ??? This is probably an Ada unnamed subrange type. Ignore the
10837 TREE_TYPE field. We can't emit debug info for this
10838 because it is an unnamed integral type. */
10839 if (TREE_CODE (domain
) == INTEGER_TYPE
10840 && TYPE_NAME (domain
) == NULL_TREE
10841 && TREE_CODE (TREE_TYPE (domain
)) == INTEGER_TYPE
10842 && TYPE_NAME (TREE_TYPE (domain
)) == NULL_TREE
)
10845 add_type_attribute (subrange_die
, TREE_TYPE (domain
), 0, 0,
10849 /* ??? If upper is NULL, the array has unspecified length,
10850 but it does have a lower bound. This happens with Fortran
10852 Since the debugger is definitely going to need to know N
10853 to produce useful results, go ahead and output the lower
10854 bound solo, and hope the debugger can cope. */
10856 add_bound_info (subrange_die
, DW_AT_lower_bound
, lower
);
10858 add_bound_info (subrange_die
, DW_AT_upper_bound
, upper
);
10861 /* Otherwise we have an array type with an unspecified length. The
10862 DWARF-2 spec does not say how to handle this; let's just leave out the
10868 add_byte_size_attribute (dw_die_ref die
, tree tree_node
)
10872 switch (TREE_CODE (tree_node
))
10877 case ENUMERAL_TYPE
:
10880 case QUAL_UNION_TYPE
:
10881 size
= int_size_in_bytes (tree_node
);
10884 /* For a data member of a struct or union, the DW_AT_byte_size is
10885 generally given as the number of bytes normally allocated for an
10886 object of the *declared* type of the member itself. This is true
10887 even for bit-fields. */
10888 size
= simple_type_size_in_bits (field_type (tree_node
)) / BITS_PER_UNIT
;
10891 gcc_unreachable ();
10894 /* Note that `size' might be -1 when we get to this point. If it is, that
10895 indicates that the byte size of the entity in question is variable. We
10896 have no good way of expressing this fact in Dwarf at the present time,
10897 so just let the -1 pass on through. */
10898 add_AT_unsigned (die
, DW_AT_byte_size
, size
);
10901 /* For a FIELD_DECL node which represents a bit-field, output an attribute
10902 which specifies the distance in bits from the highest order bit of the
10903 "containing object" for the bit-field to the highest order bit of the
10906 For any given bit-field, the "containing object" is a hypothetical object
10907 (of some integral or enum type) within which the given bit-field lives. The
10908 type of this hypothetical "containing object" is always the same as the
10909 declared type of the individual bit-field itself. The determination of the
10910 exact location of the "containing object" for a bit-field is rather
10911 complicated. It's handled by the `field_byte_offset' function (above).
10913 Note that it is the size (in bytes) of the hypothetical "containing object"
10914 which will be given in the DW_AT_byte_size attribute for this bit-field.
10915 (See `byte_size_attribute' above). */
10918 add_bit_offset_attribute (dw_die_ref die
, tree decl
)
10920 HOST_WIDE_INT object_offset_in_bytes
= field_byte_offset (decl
);
10921 tree type
= DECL_BIT_FIELD_TYPE (decl
);
10922 HOST_WIDE_INT bitpos_int
;
10923 HOST_WIDE_INT highest_order_object_bit_offset
;
10924 HOST_WIDE_INT highest_order_field_bit_offset
;
10925 HOST_WIDE_INT
unsigned bit_offset
;
10927 /* Must be a field and a bit field. */
10928 gcc_assert (type
&& TREE_CODE (decl
) == FIELD_DECL
);
10930 /* We can't yet handle bit-fields whose offsets are variable, so if we
10931 encounter such things, just return without generating any attribute
10932 whatsoever. Likewise for variable or too large size. */
10933 if (! host_integerp (bit_position (decl
), 0)
10934 || ! host_integerp (DECL_SIZE (decl
), 1))
10937 bitpos_int
= int_bit_position (decl
);
10939 /* Note that the bit offset is always the distance (in bits) from the
10940 highest-order bit of the "containing object" to the highest-order bit of
10941 the bit-field itself. Since the "high-order end" of any object or field
10942 is different on big-endian and little-endian machines, the computation
10943 below must take account of these differences. */
10944 highest_order_object_bit_offset
= object_offset_in_bytes
* BITS_PER_UNIT
;
10945 highest_order_field_bit_offset
= bitpos_int
;
10947 if (! BYTES_BIG_ENDIAN
)
10949 highest_order_field_bit_offset
+= tree_low_cst (DECL_SIZE (decl
), 0);
10950 highest_order_object_bit_offset
+= simple_type_size_in_bits (type
);
10954 = (! BYTES_BIG_ENDIAN
10955 ? highest_order_object_bit_offset
- highest_order_field_bit_offset
10956 : highest_order_field_bit_offset
- highest_order_object_bit_offset
);
10958 add_AT_unsigned (die
, DW_AT_bit_offset
, bit_offset
);
10961 /* For a FIELD_DECL node which represents a bit field, output an attribute
10962 which specifies the length in bits of the given field. */
10965 add_bit_size_attribute (dw_die_ref die
, tree decl
)
10967 /* Must be a field and a bit field. */
10968 gcc_assert (TREE_CODE (decl
) == FIELD_DECL
10969 && DECL_BIT_FIELD_TYPE (decl
));
10971 if (host_integerp (DECL_SIZE (decl
), 1))
10972 add_AT_unsigned (die
, DW_AT_bit_size
, tree_low_cst (DECL_SIZE (decl
), 1));
10975 /* If the compiled language is ANSI C, then add a 'prototyped'
10976 attribute, if arg types are given for the parameters of a function. */
10979 add_prototyped_attribute (dw_die_ref die
, tree func_type
)
10981 if (get_AT_unsigned (comp_unit_die
, DW_AT_language
) == DW_LANG_C89
10982 && TYPE_ARG_TYPES (func_type
) != NULL
)
10983 add_AT_flag (die
, DW_AT_prototyped
, 1);
10986 /* Add an 'abstract_origin' attribute below a given DIE. The DIE is found
10987 by looking in either the type declaration or object declaration
10991 add_abstract_origin_attribute (dw_die_ref die
, tree origin
)
10993 dw_die_ref origin_die
= NULL
;
10995 if (TREE_CODE (origin
) != FUNCTION_DECL
)
10997 /* We may have gotten separated from the block for the inlined
10998 function, if we're in an exception handler or some such; make
10999 sure that the abstract function has been written out.
11001 Doing this for nested functions is wrong, however; functions are
11002 distinct units, and our context might not even be inline. */
11006 fn
= TYPE_STUB_DECL (fn
);
11008 fn
= decl_function_context (fn
);
11010 dwarf2out_abstract_function (fn
);
11013 if (DECL_P (origin
))
11014 origin_die
= lookup_decl_die (origin
);
11015 else if (TYPE_P (origin
))
11016 origin_die
= lookup_type_die (origin
);
11018 /* XXX: Functions that are never lowered don't always have correct block
11019 trees (in the case of java, they simply have no block tree, in some other
11020 languages). For these functions, there is nothing we can really do to
11021 output correct debug info for inlined functions in all cases. Rather
11022 than die, we'll just produce deficient debug info now, in that we will
11023 have variables without a proper abstract origin. In the future, when all
11024 functions are lowered, we should re-add a gcc_assert (origin_die)
11028 add_AT_die_ref (die
, DW_AT_abstract_origin
, origin_die
);
11031 /* We do not currently support the pure_virtual attribute. */
11034 add_pure_or_virtual_attribute (dw_die_ref die
, tree func_decl
)
11036 if (DECL_VINDEX (func_decl
))
11038 add_AT_unsigned (die
, DW_AT_virtuality
, DW_VIRTUALITY_virtual
);
11040 if (host_integerp (DECL_VINDEX (func_decl
), 0))
11041 add_AT_loc (die
, DW_AT_vtable_elem_location
,
11042 new_loc_descr (DW_OP_constu
,
11043 tree_low_cst (DECL_VINDEX (func_decl
), 0),
11046 /* GNU extension: Record what type this method came from originally. */
11047 if (debug_info_level
> DINFO_LEVEL_TERSE
)
11048 add_AT_die_ref (die
, DW_AT_containing_type
,
11049 lookup_type_die (DECL_CONTEXT (func_decl
)));
11053 /* Add source coordinate attributes for the given decl. */
11056 add_src_coords_attributes (dw_die_ref die
, tree decl
)
11058 expanded_location s
= expand_location (DECL_SOURCE_LOCATION (decl
));
11060 add_AT_file (die
, DW_AT_decl_file
, lookup_filename (s
.file
));
11061 add_AT_unsigned (die
, DW_AT_decl_line
, s
.line
);
11064 /* Add a DW_AT_name attribute and source coordinate attribute for the
11065 given decl, but only if it actually has a name. */
11068 add_name_and_src_coords_attributes (dw_die_ref die
, tree decl
)
11072 decl_name
= DECL_NAME (decl
);
11073 if (decl_name
!= NULL
&& IDENTIFIER_POINTER (decl_name
) != NULL
)
11075 add_name_attribute (die
, dwarf2_name (decl
, 0));
11076 if (! DECL_ARTIFICIAL (decl
))
11077 add_src_coords_attributes (die
, decl
);
11079 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
11080 && TREE_PUBLIC (decl
)
11081 && DECL_ASSEMBLER_NAME (decl
) != DECL_NAME (decl
)
11082 && !DECL_ABSTRACT (decl
)
11083 && !(TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
)))
11084 add_AT_string (die
, DW_AT_MIPS_linkage_name
,
11085 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)));
11088 #ifdef VMS_DEBUGGING_INFO
11089 /* Get the function's name, as described by its RTL. This may be different
11090 from the DECL_NAME name used in the source file. */
11091 if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
11093 add_AT_addr (die
, DW_AT_VMS_rtnbeg_pd_address
,
11094 XEXP (DECL_RTL (decl
), 0));
11095 VEC_safe_push (tree
, gc
, used_rtx_array
, XEXP (DECL_RTL (decl
), 0));
11100 /* Push a new declaration scope. */
11103 push_decl_scope (tree scope
)
11105 VEC_safe_push (tree
, gc
, decl_scope_table
, scope
);
11108 /* Pop a declaration scope. */
11111 pop_decl_scope (void)
11113 VEC_pop (tree
, decl_scope_table
);
11116 /* Return the DIE for the scope that immediately contains this type.
11117 Non-named types get global scope. Named types nested in other
11118 types get their containing scope if it's open, or global scope
11119 otherwise. All other types (i.e. function-local named types) get
11120 the current active scope. */
11123 scope_die_for (tree t
, dw_die_ref context_die
)
11125 dw_die_ref scope_die
= NULL
;
11126 tree containing_scope
;
11129 /* Non-types always go in the current scope. */
11130 gcc_assert (TYPE_P (t
));
11132 containing_scope
= TYPE_CONTEXT (t
);
11134 /* Use the containing namespace if it was passed in (for a declaration). */
11135 if (containing_scope
&& TREE_CODE (containing_scope
) == NAMESPACE_DECL
)
11137 if (context_die
== lookup_decl_die (containing_scope
))
11140 containing_scope
= NULL_TREE
;
11143 /* Ignore function type "scopes" from the C frontend. They mean that
11144 a tagged type is local to a parmlist of a function declarator, but
11145 that isn't useful to DWARF. */
11146 if (containing_scope
&& TREE_CODE (containing_scope
) == FUNCTION_TYPE
)
11147 containing_scope
= NULL_TREE
;
11149 if (containing_scope
== NULL_TREE
)
11150 scope_die
= comp_unit_die
;
11151 else if (TYPE_P (containing_scope
))
11153 /* For types, we can just look up the appropriate DIE. But
11154 first we check to see if we're in the middle of emitting it
11155 so we know where the new DIE should go. */
11156 for (i
= VEC_length (tree
, decl_scope_table
) - 1; i
>= 0; --i
)
11157 if (VEC_index (tree
, decl_scope_table
, i
) == containing_scope
)
11162 gcc_assert (debug_info_level
<= DINFO_LEVEL_TERSE
11163 || TREE_ASM_WRITTEN (containing_scope
));
11165 /* If none of the current dies are suitable, we get file scope. */
11166 scope_die
= comp_unit_die
;
11169 scope_die
= lookup_type_die (containing_scope
);
11172 scope_die
= context_die
;
11177 /* Returns nonzero if CONTEXT_DIE is internal to a function. */
11180 local_scope_p (dw_die_ref context_die
)
11182 for (; context_die
; context_die
= context_die
->die_parent
)
11183 if (context_die
->die_tag
== DW_TAG_inlined_subroutine
11184 || context_die
->die_tag
== DW_TAG_subprogram
)
11190 /* Returns nonzero if CONTEXT_DIE is a class or namespace, for deciding
11191 whether or not to treat a DIE in this context as a declaration. */
11194 class_or_namespace_scope_p (dw_die_ref context_die
)
11196 return (context_die
11197 && (context_die
->die_tag
== DW_TAG_structure_type
11198 || context_die
->die_tag
== DW_TAG_union_type
11199 || context_die
->die_tag
== DW_TAG_namespace
));
11202 /* Many forms of DIEs require a "type description" attribute. This
11203 routine locates the proper "type descriptor" die for the type given
11204 by 'type', and adds a DW_AT_type attribute below the given die. */
11207 add_type_attribute (dw_die_ref object_die
, tree type
, int decl_const
,
11208 int decl_volatile
, dw_die_ref context_die
)
11210 enum tree_code code
= TREE_CODE (type
);
11211 dw_die_ref type_die
= NULL
;
11213 /* ??? If this type is an unnamed subrange type of an integral or
11214 floating-point type, use the inner type. This is because we have no
11215 support for unnamed types in base_type_die. This can happen if this is
11216 an Ada subrange type. Correct solution is emit a subrange type die. */
11217 if ((code
== INTEGER_TYPE
|| code
== REAL_TYPE
)
11218 && TREE_TYPE (type
) != 0 && TYPE_NAME (type
) == 0)
11219 type
= TREE_TYPE (type
), code
= TREE_CODE (type
);
11221 if (code
== ERROR_MARK
11222 /* Handle a special case. For functions whose return type is void, we
11223 generate *no* type attribute. (Note that no object may have type
11224 `void', so this only applies to function return types). */
11225 || code
== VOID_TYPE
)
11228 type_die
= modified_type_die (type
,
11229 decl_const
|| TYPE_READONLY (type
),
11230 decl_volatile
|| TYPE_VOLATILE (type
),
11233 if (type_die
!= NULL
)
11234 add_AT_die_ref (object_die
, DW_AT_type
, type_die
);
11237 /* Given an object die, add the calling convention attribute for the
11238 function call type. */
11240 add_calling_convention_attribute (dw_die_ref subr_die
, tree type
)
11242 enum dwarf_calling_convention value
= DW_CC_normal
;
11244 value
= targetm
.dwarf_calling_convention (type
);
11246 /* Only add the attribute if the backend requests it, and
11247 is not DW_CC_normal. */
11248 if (value
&& (value
!= DW_CC_normal
))
11249 add_AT_unsigned (subr_die
, DW_AT_calling_convention
, value
);
11252 /* Given a tree pointer to a struct, class, union, or enum type node, return
11253 a pointer to the (string) tag name for the given type, or zero if the type
11254 was declared without a tag. */
11256 static const char *
11257 type_tag (tree type
)
11259 const char *name
= 0;
11261 if (TYPE_NAME (type
) != 0)
11265 /* Find the IDENTIFIER_NODE for the type name. */
11266 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
11267 t
= TYPE_NAME (type
);
11269 /* The g++ front end makes the TYPE_NAME of *each* tagged type point to
11270 a TYPE_DECL node, regardless of whether or not a `typedef' was
11272 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11273 && ! DECL_IGNORED_P (TYPE_NAME (type
)))
11275 /* We want to be extra verbose. Don't call dwarf_name if
11276 DECL_NAME isn't set. The default hook for decl_printable_name
11277 doesn't like that, and in this context it's correct to return
11278 0, instead of "<anonymous>" or the like. */
11279 if (DECL_NAME (TYPE_NAME (type
)))
11280 name
= lang_hooks
.dwarf_name (TYPE_NAME (type
), 2);
11283 /* Now get the name as a string, or invent one. */
11284 if (!name
&& t
!= 0)
11285 name
= IDENTIFIER_POINTER (t
);
11288 return (name
== 0 || *name
== '\0') ? 0 : name
;
11291 /* Return the type associated with a data member, make a special check
11292 for bit field types. */
11295 member_declared_type (tree member
)
11297 return (DECL_BIT_FIELD_TYPE (member
)
11298 ? DECL_BIT_FIELD_TYPE (member
) : TREE_TYPE (member
));
11301 /* Get the decl's label, as described by its RTL. This may be different
11302 from the DECL_NAME name used in the source file. */
11305 static const char *
11306 decl_start_label (tree decl
)
11309 const char *fnname
;
11311 x
= DECL_RTL (decl
);
11312 gcc_assert (MEM_P (x
));
11315 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
11317 fnname
= XSTR (x
, 0);
11322 /* These routines generate the internal representation of the DIE's for
11323 the compilation unit. Debugging information is collected by walking
11324 the declaration trees passed in from dwarf2out_decl(). */
11327 gen_array_type_die (tree type
, dw_die_ref context_die
)
11329 dw_die_ref scope_die
= scope_die_for (type
, context_die
);
11330 dw_die_ref array_die
;
11333 /* ??? The SGI dwarf reader fails for array of array of enum types unless
11334 the inner array type comes before the outer array type. Thus we must
11335 call gen_type_die before we call new_die. See below also. */
11336 #ifdef MIPS_DEBUGGING_INFO
11337 gen_type_die (TREE_TYPE (type
), context_die
);
11340 array_die
= new_die (DW_TAG_array_type
, scope_die
, type
);
11341 add_name_attribute (array_die
, type_tag (type
));
11342 equate_type_number_to_die (type
, array_die
);
11344 if (TREE_CODE (type
) == VECTOR_TYPE
)
11346 /* The frontend feeds us a representation for the vector as a struct
11347 containing an array. Pull out the array type. */
11348 type
= TREE_TYPE (TYPE_FIELDS (TYPE_DEBUG_REPRESENTATION_TYPE (type
)));
11349 add_AT_flag (array_die
, DW_AT_GNU_vector
, 1);
11353 /* We default the array ordering. SDB will probably do
11354 the right things even if DW_AT_ordering is not present. It's not even
11355 an issue until we start to get into multidimensional arrays anyway. If
11356 SDB is ever caught doing the Wrong Thing for multi-dimensional arrays,
11357 then we'll have to put the DW_AT_ordering attribute back in. (But if
11358 and when we find out that we need to put these in, we will only do so
11359 for multidimensional arrays. */
11360 add_AT_unsigned (array_die
, DW_AT_ordering
, DW_ORD_row_major
);
11363 #ifdef MIPS_DEBUGGING_INFO
11364 /* The SGI compilers handle arrays of unknown bound by setting
11365 AT_declaration and not emitting any subrange DIEs. */
11366 if (! TYPE_DOMAIN (type
))
11367 add_AT_flag (array_die
, DW_AT_declaration
, 1);
11370 add_subscript_info (array_die
, type
);
11372 /* Add representation of the type of the elements of this array type. */
11373 element_type
= TREE_TYPE (type
);
11375 /* ??? The SGI dwarf reader fails for multidimensional arrays with a
11376 const enum type. E.g. const enum machine_mode insn_operand_mode[2][10].
11377 We work around this by disabling this feature. See also
11378 add_subscript_info. */
11379 #ifndef MIPS_DEBUGGING_INFO
11380 while (TREE_CODE (element_type
) == ARRAY_TYPE
)
11381 element_type
= TREE_TYPE (element_type
);
11383 gen_type_die (element_type
, context_die
);
11386 add_type_attribute (array_die
, element_type
, 0, 0, context_die
);
11388 if (get_AT (array_die
, DW_AT_name
))
11389 add_pubtype (type
, array_die
);
11394 gen_entry_point_die (tree decl
, dw_die_ref context_die
)
11396 tree origin
= decl_ultimate_origin (decl
);
11397 dw_die_ref decl_die
= new_die (DW_TAG_entry_point
, context_die
, decl
);
11399 if (origin
!= NULL
)
11400 add_abstract_origin_attribute (decl_die
, origin
);
11403 add_name_and_src_coords_attributes (decl_die
, decl
);
11404 add_type_attribute (decl_die
, TREE_TYPE (TREE_TYPE (decl
)),
11405 0, 0, context_die
);
11408 if (DECL_ABSTRACT (decl
))
11409 equate_decl_number_to_die (decl
, decl_die
);
11411 add_AT_lbl_id (decl_die
, DW_AT_low_pc
, decl_start_label (decl
));
11415 /* Walk through the list of incomplete types again, trying once more to
11416 emit full debugging info for them. */
11419 retry_incomplete_types (void)
11423 for (i
= VEC_length (tree
, incomplete_types
) - 1; i
>= 0; i
--)
11424 gen_type_die (VEC_index (tree
, incomplete_types
, i
), comp_unit_die
);
11427 /* Generate a DIE to represent an inlined instance of an enumeration type. */
11430 gen_inlined_enumeration_type_die (tree type
, dw_die_ref context_die
)
11432 dw_die_ref type_die
= new_die (DW_TAG_enumeration_type
, context_die
, type
);
11434 /* We do not check for TREE_ASM_WRITTEN (type) being set, as the type may
11435 be incomplete and such types are not marked. */
11436 add_abstract_origin_attribute (type_die
, type
);
11439 /* Generate a DIE to represent an inlined instance of a structure type. */
11442 gen_inlined_structure_type_die (tree type
, dw_die_ref context_die
)
11444 dw_die_ref type_die
= new_die (DW_TAG_structure_type
, context_die
, type
);
11446 /* We do not check for TREE_ASM_WRITTEN (type) being set, as the type may
11447 be incomplete and such types are not marked. */
11448 add_abstract_origin_attribute (type_die
, type
);
11451 /* Generate a DIE to represent an inlined instance of a union type. */
11454 gen_inlined_union_type_die (tree type
, dw_die_ref context_die
)
11456 dw_die_ref type_die
= new_die (DW_TAG_union_type
, context_die
, type
);
11458 /* We do not check for TREE_ASM_WRITTEN (type) being set, as the type may
11459 be incomplete and such types are not marked. */
11460 add_abstract_origin_attribute (type_die
, type
);
11463 /* Generate a DIE to represent an enumeration type. Note that these DIEs
11464 include all of the information about the enumeration values also. Each
11465 enumerated type name/value is listed as a child of the enumerated type
11469 gen_enumeration_type_die (tree type
, dw_die_ref context_die
)
11471 dw_die_ref type_die
= lookup_type_die (type
);
11473 if (type_die
== NULL
)
11475 type_die
= new_die (DW_TAG_enumeration_type
,
11476 scope_die_for (type
, context_die
), type
);
11477 equate_type_number_to_die (type
, type_die
);
11478 add_name_attribute (type_die
, type_tag (type
));
11480 else if (! TYPE_SIZE (type
))
11483 remove_AT (type_die
, DW_AT_declaration
);
11485 /* Handle a GNU C/C++ extension, i.e. incomplete enum types. If the
11486 given enum type is incomplete, do not generate the DW_AT_byte_size
11487 attribute or the DW_AT_element_list attribute. */
11488 if (TYPE_SIZE (type
))
11492 TREE_ASM_WRITTEN (type
) = 1;
11493 add_byte_size_attribute (type_die
, type
);
11494 if (TYPE_STUB_DECL (type
) != NULL_TREE
)
11495 add_src_coords_attributes (type_die
, TYPE_STUB_DECL (type
));
11497 /* If the first reference to this type was as the return type of an
11498 inline function, then it may not have a parent. Fix this now. */
11499 if (type_die
->die_parent
== NULL
)
11500 add_child_die (scope_die_for (type
, context_die
), type_die
);
11502 for (link
= TYPE_VALUES (type
);
11503 link
!= NULL
; link
= TREE_CHAIN (link
))
11505 dw_die_ref enum_die
= new_die (DW_TAG_enumerator
, type_die
, link
);
11506 tree value
= TREE_VALUE (link
);
11508 add_name_attribute (enum_die
,
11509 IDENTIFIER_POINTER (TREE_PURPOSE (link
)));
11511 if (host_integerp (value
, TYPE_UNSIGNED (TREE_TYPE (value
))))
11512 /* DWARF2 does not provide a way of indicating whether or
11513 not enumeration constants are signed or unsigned. GDB
11514 always assumes the values are signed, so we output all
11515 values as if they were signed. That means that
11516 enumeration constants with very large unsigned values
11517 will appear to have negative values in the debugger. */
11518 add_AT_int (enum_die
, DW_AT_const_value
,
11519 tree_low_cst (value
, tree_int_cst_sgn (value
) > 0));
11523 add_AT_flag (type_die
, DW_AT_declaration
, 1);
11525 if (get_AT (type_die
, DW_AT_name
))
11526 add_pubtype (type
, type_die
);
11531 /* Generate a DIE to represent either a real live formal parameter decl or to
11532 represent just the type of some formal parameter position in some function
11535 Note that this routine is a bit unusual because its argument may be a
11536 ..._DECL node (i.e. either a PARM_DECL or perhaps a VAR_DECL which
11537 represents an inlining of some PARM_DECL) or else some sort of a ..._TYPE
11538 node. If it's the former then this function is being called to output a
11539 DIE to represent a formal parameter object (or some inlining thereof). If
11540 it's the latter, then this function is only being called to output a
11541 DW_TAG_formal_parameter DIE to stand as a placeholder for some formal
11542 argument type of some subprogram type. */
11545 gen_formal_parameter_die (tree node
, dw_die_ref context_die
)
11547 dw_die_ref parm_die
11548 = new_die (DW_TAG_formal_parameter
, context_die
, node
);
11551 switch (TREE_CODE_CLASS (TREE_CODE (node
)))
11553 case tcc_declaration
:
11554 origin
= decl_ultimate_origin (node
);
11555 if (origin
!= NULL
)
11556 add_abstract_origin_attribute (parm_die
, origin
);
11559 add_name_and_src_coords_attributes (parm_die
, node
);
11560 add_type_attribute (parm_die
, TREE_TYPE (node
),
11561 TREE_READONLY (node
),
11562 TREE_THIS_VOLATILE (node
),
11564 if (DECL_ARTIFICIAL (node
))
11565 add_AT_flag (parm_die
, DW_AT_artificial
, 1);
11568 equate_decl_number_to_die (node
, parm_die
);
11569 if (! DECL_ABSTRACT (node
))
11570 add_location_or_const_value_attribute (parm_die
, node
, DW_AT_location
);
11575 /* We were called with some kind of a ..._TYPE node. */
11576 add_type_attribute (parm_die
, node
, 0, 0, context_die
);
11580 gcc_unreachable ();
11586 /* Generate a special type of DIE used as a stand-in for a trailing ellipsis
11587 at the end of an (ANSI prototyped) formal parameters list. */
11590 gen_unspecified_parameters_die (tree decl_or_type
, dw_die_ref context_die
)
11592 new_die (DW_TAG_unspecified_parameters
, context_die
, decl_or_type
);
11595 /* Generate a list of nameless DW_TAG_formal_parameter DIEs (and perhaps a
11596 DW_TAG_unspecified_parameters DIE) to represent the types of the formal
11597 parameters as specified in some function type specification (except for
11598 those which appear as part of a function *definition*). */
11601 gen_formal_types_die (tree function_or_method_type
, dw_die_ref context_die
)
11604 tree formal_type
= NULL
;
11605 tree first_parm_type
;
11608 if (TREE_CODE (function_or_method_type
) == FUNCTION_DECL
)
11610 arg
= DECL_ARGUMENTS (function_or_method_type
);
11611 function_or_method_type
= TREE_TYPE (function_or_method_type
);
11616 first_parm_type
= TYPE_ARG_TYPES (function_or_method_type
);
11618 /* Make our first pass over the list of formal parameter types and output a
11619 DW_TAG_formal_parameter DIE for each one. */
11620 for (link
= first_parm_type
; link
; )
11622 dw_die_ref parm_die
;
11624 formal_type
= TREE_VALUE (link
);
11625 if (formal_type
== void_type_node
)
11628 /* Output a (nameless) DIE to represent the formal parameter itself. */
11629 parm_die
= gen_formal_parameter_die (formal_type
, context_die
);
11630 if ((TREE_CODE (function_or_method_type
) == METHOD_TYPE
11631 && link
== first_parm_type
)
11632 || (arg
&& DECL_ARTIFICIAL (arg
)))
11633 add_AT_flag (parm_die
, DW_AT_artificial
, 1);
11635 link
= TREE_CHAIN (link
);
11637 arg
= TREE_CHAIN (arg
);
11640 /* If this function type has an ellipsis, add a
11641 DW_TAG_unspecified_parameters DIE to the end of the parameter list. */
11642 if (formal_type
!= void_type_node
)
11643 gen_unspecified_parameters_die (function_or_method_type
, context_die
);
11645 /* Make our second (and final) pass over the list of formal parameter types
11646 and output DIEs to represent those types (as necessary). */
11647 for (link
= TYPE_ARG_TYPES (function_or_method_type
);
11648 link
&& TREE_VALUE (link
);
11649 link
= TREE_CHAIN (link
))
11650 gen_type_die (TREE_VALUE (link
), context_die
);
11653 /* We want to generate the DIE for TYPE so that we can generate the
11654 die for MEMBER, which has been defined; we will need to refer back
11655 to the member declaration nested within TYPE. If we're trying to
11656 generate minimal debug info for TYPE, processing TYPE won't do the
11657 trick; we need to attach the member declaration by hand. */
11660 gen_type_die_for_member (tree type
, tree member
, dw_die_ref context_die
)
11662 gen_type_die (type
, context_die
);
11664 /* If we're trying to avoid duplicate debug info, we may not have
11665 emitted the member decl for this function. Emit it now. */
11666 if (TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (type
))
11667 && ! lookup_decl_die (member
))
11669 dw_die_ref type_die
;
11670 gcc_assert (!decl_ultimate_origin (member
));
11672 push_decl_scope (type
);
11673 type_die
= lookup_type_die (type
);
11674 if (TREE_CODE (member
) == FUNCTION_DECL
)
11675 gen_subprogram_die (member
, type_die
);
11676 else if (TREE_CODE (member
) == FIELD_DECL
)
11678 /* Ignore the nameless fields that are used to skip bits but handle
11679 C++ anonymous unions and structs. */
11680 if (DECL_NAME (member
) != NULL_TREE
11681 || TREE_CODE (TREE_TYPE (member
)) == UNION_TYPE
11682 || TREE_CODE (TREE_TYPE (member
)) == RECORD_TYPE
)
11684 gen_type_die (member_declared_type (member
), type_die
);
11685 gen_field_die (member
, type_die
);
11689 gen_variable_die (member
, type_die
);
11695 /* Generate the DWARF2 info for the "abstract" instance of a function which we
11696 may later generate inlined and/or out-of-line instances of. */
11699 dwarf2out_abstract_function (tree decl
)
11701 dw_die_ref old_die
;
11703 struct function
*save_cfun
;
11705 int was_abstract
= DECL_ABSTRACT (decl
);
11707 /* Make sure we have the actual abstract inline, not a clone. */
11708 decl
= DECL_ORIGIN (decl
);
11710 old_die
= lookup_decl_die (decl
);
11711 if (old_die
&& get_AT (old_die
, DW_AT_inline
))
11712 /* We've already generated the abstract instance. */
11715 /* Be sure we've emitted the in-class declaration DIE (if any) first, so
11716 we don't get confused by DECL_ABSTRACT. */
11717 if (debug_info_level
> DINFO_LEVEL_TERSE
)
11719 context
= decl_class_context (decl
);
11721 gen_type_die_for_member
11722 (context
, decl
, decl_function_context (decl
) ? NULL
: comp_unit_die
);
11725 /* Pretend we've just finished compiling this function. */
11726 save_fn
= current_function_decl
;
11728 current_function_decl
= decl
;
11729 cfun
= DECL_STRUCT_FUNCTION (decl
);
11731 set_decl_abstract_flags (decl
, 1);
11732 dwarf2out_decl (decl
);
11733 if (! was_abstract
)
11734 set_decl_abstract_flags (decl
, 0);
11736 current_function_decl
= save_fn
;
11740 /* Helper function of premark_used_types() which gets called through
11741 htab_traverse_resize().
11743 Marks the DIE of a given type in *SLOT as perennial, so it never gets
11744 marked as unused by prune_unused_types. */
11746 premark_used_types_helper (void **slot
, void *data ATTRIBUTE_UNUSED
)
11752 die
= lookup_type_die (type
);
11754 die
->die_perennial_p
= 1;
11758 /* Mark all members of used_types_hash as perennial. */
11760 premark_used_types (void)
11762 if (cfun
&& cfun
->used_types_hash
)
11763 htab_traverse (cfun
->used_types_hash
, premark_used_types_helper
, NULL
);
11766 /* Generate a DIE to represent a declared function (either file-scope or
11770 gen_subprogram_die (tree decl
, dw_die_ref context_die
)
11772 char label_id
[MAX_ARTIFICIAL_LABEL_BYTES
];
11773 tree origin
= decl_ultimate_origin (decl
);
11774 dw_die_ref subr_die
;
11777 dw_die_ref old_die
= lookup_decl_die (decl
);
11778 int declaration
= (current_function_decl
!= decl
11779 || class_or_namespace_scope_p (context_die
));
11781 premark_used_types ();
11783 /* It is possible to have both DECL_ABSTRACT and DECLARATION be true if we
11784 started to generate the abstract instance of an inline, decided to output
11785 its containing class, and proceeded to emit the declaration of the inline
11786 from the member list for the class. If so, DECLARATION takes priority;
11787 we'll get back to the abstract instance when done with the class. */
11789 /* The class-scope declaration DIE must be the primary DIE. */
11790 if (origin
&& declaration
&& class_or_namespace_scope_p (context_die
))
11793 gcc_assert (!old_die
);
11796 /* Now that the C++ front end lazily declares artificial member fns, we
11797 might need to retrofit the declaration into its class. */
11798 if (!declaration
&& !origin
&& !old_die
11799 && DECL_CONTEXT (decl
) && TYPE_P (DECL_CONTEXT (decl
))
11800 && !class_or_namespace_scope_p (context_die
)
11801 && debug_info_level
> DINFO_LEVEL_TERSE
)
11802 old_die
= force_decl_die (decl
);
11804 if (origin
!= NULL
)
11806 gcc_assert (!declaration
|| local_scope_p (context_die
));
11808 /* Fixup die_parent for the abstract instance of a nested
11809 inline function. */
11810 if (old_die
&& old_die
->die_parent
== NULL
)
11811 add_child_die (context_die
, old_die
);
11813 subr_die
= new_die (DW_TAG_subprogram
, context_die
, decl
);
11814 add_abstract_origin_attribute (subr_die
, origin
);
11818 expanded_location s
= expand_location (DECL_SOURCE_LOCATION (decl
));
11819 struct dwarf_file_data
* file_index
= lookup_filename (s
.file
);
11821 if (!get_AT_flag (old_die
, DW_AT_declaration
)
11822 /* We can have a normal definition following an inline one in the
11823 case of redefinition of GNU C extern inlines.
11824 It seems reasonable to use AT_specification in this case. */
11825 && !get_AT (old_die
, DW_AT_inline
))
11827 /* Detect and ignore this case, where we are trying to output
11828 something we have already output. */
11832 /* If the definition comes from the same place as the declaration,
11833 maybe use the old DIE. We always want the DIE for this function
11834 that has the *_pc attributes to be under comp_unit_die so the
11835 debugger can find it. We also need to do this for abstract
11836 instances of inlines, since the spec requires the out-of-line copy
11837 to have the same parent. For local class methods, this doesn't
11838 apply; we just use the old DIE. */
11839 if ((old_die
->die_parent
== comp_unit_die
|| context_die
== NULL
)
11840 && (DECL_ARTIFICIAL (decl
)
11841 || (get_AT_file (old_die
, DW_AT_decl_file
) == file_index
11842 && (get_AT_unsigned (old_die
, DW_AT_decl_line
)
11843 == (unsigned) s
.line
))))
11845 subr_die
= old_die
;
11847 /* Clear out the declaration attribute and the formal parameters.
11848 Do not remove all children, because it is possible that this
11849 declaration die was forced using force_decl_die(). In such
11850 cases die that forced declaration die (e.g. TAG_imported_module)
11851 is one of the children that we do not want to remove. */
11852 remove_AT (subr_die
, DW_AT_declaration
);
11853 remove_child_TAG (subr_die
, DW_TAG_formal_parameter
);
11857 subr_die
= new_die (DW_TAG_subprogram
, context_die
, decl
);
11858 add_AT_specification (subr_die
, old_die
);
11859 if (get_AT_file (old_die
, DW_AT_decl_file
) != file_index
)
11860 add_AT_file (subr_die
, DW_AT_decl_file
, file_index
);
11861 if (get_AT_unsigned (old_die
, DW_AT_decl_line
) != (unsigned) s
.line
)
11862 add_AT_unsigned (subr_die
, DW_AT_decl_line
, s
.line
);
11867 subr_die
= new_die (DW_TAG_subprogram
, context_die
, decl
);
11869 if (TREE_PUBLIC (decl
))
11870 add_AT_flag (subr_die
, DW_AT_external
, 1);
11872 add_name_and_src_coords_attributes (subr_die
, decl
);
11873 if (debug_info_level
> DINFO_LEVEL_TERSE
)
11875 add_prototyped_attribute (subr_die
, TREE_TYPE (decl
));
11876 add_type_attribute (subr_die
, TREE_TYPE (TREE_TYPE (decl
)),
11877 0, 0, context_die
);
11880 add_pure_or_virtual_attribute (subr_die
, decl
);
11881 if (DECL_ARTIFICIAL (decl
))
11882 add_AT_flag (subr_die
, DW_AT_artificial
, 1);
11884 if (TREE_PROTECTED (decl
))
11885 add_AT_unsigned (subr_die
, DW_AT_accessibility
, DW_ACCESS_protected
);
11886 else if (TREE_PRIVATE (decl
))
11887 add_AT_unsigned (subr_die
, DW_AT_accessibility
, DW_ACCESS_private
);
11892 if (!old_die
|| !get_AT (old_die
, DW_AT_inline
))
11894 add_AT_flag (subr_die
, DW_AT_declaration
, 1);
11896 /* The first time we see a member function, it is in the context of
11897 the class to which it belongs. We make sure of this by emitting
11898 the class first. The next time is the definition, which is
11899 handled above. The two may come from the same source text.
11901 Note that force_decl_die() forces function declaration die. It is
11902 later reused to represent definition. */
11903 equate_decl_number_to_die (decl
, subr_die
);
11906 else if (DECL_ABSTRACT (decl
))
11908 if (DECL_DECLARED_INLINE_P (decl
))
11910 if (cgraph_function_possibly_inlined_p (decl
))
11911 add_AT_unsigned (subr_die
, DW_AT_inline
, DW_INL_declared_inlined
);
11913 add_AT_unsigned (subr_die
, DW_AT_inline
, DW_INL_declared_not_inlined
);
11917 if (cgraph_function_possibly_inlined_p (decl
))
11918 add_AT_unsigned (subr_die
, DW_AT_inline
, DW_INL_inlined
);
11920 add_AT_unsigned (subr_die
, DW_AT_inline
, DW_INL_not_inlined
);
11923 equate_decl_number_to_die (decl
, subr_die
);
11925 else if (!DECL_EXTERNAL (decl
))
11927 HOST_WIDE_INT cfa_fb_offset
;
11929 if (!old_die
|| !get_AT (old_die
, DW_AT_inline
))
11930 equate_decl_number_to_die (decl
, subr_die
);
11932 if (!flag_reorder_blocks_and_partition
)
11934 ASM_GENERATE_INTERNAL_LABEL (label_id
, FUNC_BEGIN_LABEL
,
11935 current_function_funcdef_no
);
11936 add_AT_lbl_id (subr_die
, DW_AT_low_pc
, label_id
);
11937 ASM_GENERATE_INTERNAL_LABEL (label_id
, FUNC_END_LABEL
,
11938 current_function_funcdef_no
);
11939 add_AT_lbl_id (subr_die
, DW_AT_high_pc
, label_id
);
11941 add_pubname (decl
, subr_die
);
11942 add_arange (decl
, subr_die
);
11945 { /* Do nothing for now; maybe need to duplicate die, one for
11946 hot section and ond for cold section, then use the hot/cold
11947 section begin/end labels to generate the aranges... */
11949 add_AT_lbl_id (subr_die, DW_AT_low_pc, hot_section_label);
11950 add_AT_lbl_id (subr_die, DW_AT_high_pc, hot_section_end_label);
11951 add_AT_lbl_id (subr_die, DW_AT_lo_user, unlikely_section_label);
11952 add_AT_lbl_id (subr_die, DW_AT_hi_user, cold_section_end_label);
11954 add_pubname (decl, subr_die);
11955 add_arange (decl, subr_die);
11956 add_arange (decl, subr_die);
11960 #ifdef MIPS_DEBUGGING_INFO
11961 /* Add a reference to the FDE for this routine. */
11962 add_AT_fde_ref (subr_die
, DW_AT_MIPS_fde
, current_funcdef_fde
);
11965 cfa_fb_offset
= CFA_FRAME_BASE_OFFSET (decl
);
11967 /* We define the "frame base" as the function's CFA. This is more
11968 convenient for several reasons: (1) It's stable across the prologue
11969 and epilogue, which makes it better than just a frame pointer,
11970 (2) With dwarf3, there exists a one-byte encoding that allows us
11971 to reference the .debug_frame data by proxy, but failing that,
11972 (3) We can at least reuse the code inspection and interpretation
11973 code that determines the CFA position at various points in the
11975 /* ??? Use some command-line or configury switch to enable the use
11976 of dwarf3 DW_OP_call_frame_cfa. At present there are no dwarf
11977 consumers that understand it; fall back to "pure" dwarf2 and
11978 convert the CFA data into a location list. */
11980 dw_loc_list_ref list
= convert_cfa_to_fb_loc_list (cfa_fb_offset
);
11981 if (list
->dw_loc_next
)
11982 add_AT_loc_list (subr_die
, DW_AT_frame_base
, list
);
11984 add_AT_loc (subr_die
, DW_AT_frame_base
, list
->expr
);
11987 /* Compute a displacement from the "steady-state frame pointer" to
11988 the CFA. The former is what all stack slots and argument slots
11989 will reference in the rtl; the later is what we've told the
11990 debugger about. We'll need to adjust all frame_base references
11991 by this displacement. */
11992 compute_frame_pointer_to_fb_displacement (cfa_fb_offset
);
11994 if (cfun
->static_chain_decl
)
11995 add_AT_location_description (subr_die
, DW_AT_static_link
,
11996 loc_descriptor_from_tree (cfun
->static_chain_decl
));
11999 /* Now output descriptions of the arguments for this function. This gets
12000 (unnecessarily?) complex because of the fact that the DECL_ARGUMENT list
12001 for a FUNCTION_DECL doesn't indicate cases where there was a trailing
12002 `...' at the end of the formal parameter list. In order to find out if
12003 there was a trailing ellipsis or not, we must instead look at the type
12004 associated with the FUNCTION_DECL. This will be a node of type
12005 FUNCTION_TYPE. If the chain of type nodes hanging off of this
12006 FUNCTION_TYPE node ends with a void_type_node then there should *not* be
12007 an ellipsis at the end. */
12009 /* In the case where we are describing a mere function declaration, all we
12010 need to do here (and all we *can* do here) is to describe the *types* of
12011 its formal parameters. */
12012 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
12014 else if (declaration
)
12015 gen_formal_types_die (decl
, subr_die
);
12018 /* Generate DIEs to represent all known formal parameters. */
12019 tree arg_decls
= DECL_ARGUMENTS (decl
);
12022 /* When generating DIEs, generate the unspecified_parameters DIE
12023 instead if we come across the arg "__builtin_va_alist" */
12024 for (parm
= arg_decls
; parm
; parm
= TREE_CHAIN (parm
))
12025 if (TREE_CODE (parm
) == PARM_DECL
)
12027 if (DECL_NAME (parm
)
12028 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (parm
)),
12029 "__builtin_va_alist"))
12030 gen_unspecified_parameters_die (parm
, subr_die
);
12032 gen_decl_die (parm
, subr_die
);
12035 /* Decide whether we need an unspecified_parameters DIE at the end.
12036 There are 2 more cases to do this for: 1) the ansi ... declaration -
12037 this is detectable when the end of the arg list is not a
12038 void_type_node 2) an unprototyped function declaration (not a
12039 definition). This just means that we have no info about the
12040 parameters at all. */
12041 fn_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
12042 if (fn_arg_types
!= NULL
)
12044 /* This is the prototyped case, check for.... */
12045 if (TREE_VALUE (tree_last (fn_arg_types
)) != void_type_node
)
12046 gen_unspecified_parameters_die (decl
, subr_die
);
12048 else if (DECL_INITIAL (decl
) == NULL_TREE
)
12049 gen_unspecified_parameters_die (decl
, subr_die
);
12052 /* Output Dwarf info for all of the stuff within the body of the function
12053 (if it has one - it may be just a declaration). */
12054 outer_scope
= DECL_INITIAL (decl
);
12056 /* OUTER_SCOPE is a pointer to the outermost BLOCK node created to represent
12057 a function. This BLOCK actually represents the outermost binding contour
12058 for the function, i.e. the contour in which the function's formal
12059 parameters and labels get declared. Curiously, it appears that the front
12060 end doesn't actually put the PARM_DECL nodes for the current function onto
12061 the BLOCK_VARS list for this outer scope, but are strung off of the
12062 DECL_ARGUMENTS list for the function instead.
12064 The BLOCK_VARS list for the `outer_scope' does provide us with a list of
12065 the LABEL_DECL nodes for the function however, and we output DWARF info
12066 for those in decls_for_scope. Just within the `outer_scope' there will be
12067 a BLOCK node representing the function's outermost pair of curly braces,
12068 and any blocks used for the base and member initializers of a C++
12069 constructor function. */
12070 if (! declaration
&& TREE_CODE (outer_scope
) != ERROR_MARK
)
12072 /* Emit a DW_TAG_variable DIE for a named return value. */
12073 if (DECL_NAME (DECL_RESULT (decl
)))
12074 gen_decl_die (DECL_RESULT (decl
), subr_die
);
12076 current_function_has_inlines
= 0;
12077 decls_for_scope (outer_scope
, subr_die
, 0);
12079 #if 0 && defined (MIPS_DEBUGGING_INFO)
12080 if (current_function_has_inlines
)
12082 add_AT_flag (subr_die
, DW_AT_MIPS_has_inlines
, 1);
12083 if (! comp_unit_has_inlines
)
12085 add_AT_flag (comp_unit_die
, DW_AT_MIPS_has_inlines
, 1);
12086 comp_unit_has_inlines
= 1;
12091 /* Add the calling convention attribute if requested. */
12092 add_calling_convention_attribute (subr_die
, TREE_TYPE (decl
));
12096 /* Generate a DIE to represent a declared data object. */
12099 gen_variable_die (tree decl
, dw_die_ref context_die
)
12101 tree origin
= decl_ultimate_origin (decl
);
12102 dw_die_ref var_die
= new_die (DW_TAG_variable
, context_die
, decl
);
12104 dw_die_ref old_die
= lookup_decl_die (decl
);
12105 int declaration
= (DECL_EXTERNAL (decl
)
12106 /* If DECL is COMDAT and has not actually been
12107 emitted, we cannot take its address; there
12108 might end up being no definition anywhere in
12109 the program. For example, consider the C++
12113 struct S { static const int i = 7; };
12118 int f() { return S<int>::i; }
12120 Here, S<int>::i is not DECL_EXTERNAL, but no
12121 definition is required, so the compiler will
12122 not emit a definition. */
12123 || (TREE_CODE (decl
) == VAR_DECL
12124 && DECL_COMDAT (decl
) && !TREE_ASM_WRITTEN (decl
))
12125 || class_or_namespace_scope_p (context_die
));
12127 if (origin
!= NULL
)
12128 add_abstract_origin_attribute (var_die
, origin
);
12130 /* Loop unrolling can create multiple blocks that refer to the same
12131 static variable, so we must test for the DW_AT_declaration flag.
12133 ??? Loop unrolling/reorder_blocks should perhaps be rewritten to
12134 copy decls and set the DECL_ABSTRACT flag on them instead of
12137 ??? Duplicated blocks have been rewritten to use .debug_ranges.
12139 ??? The declare_in_namespace support causes us to get two DIEs for one
12140 variable, both of which are declarations. We want to avoid considering
12141 one to be a specification, so we must test that this DIE is not a
12143 else if (old_die
&& TREE_STATIC (decl
) && ! declaration
12144 && get_AT_flag (old_die
, DW_AT_declaration
) == 1)
12146 /* This is a definition of a C++ class level static. */
12147 add_AT_specification (var_die
, old_die
);
12148 if (DECL_NAME (decl
))
12150 expanded_location s
= expand_location (DECL_SOURCE_LOCATION (decl
));
12151 struct dwarf_file_data
* file_index
= lookup_filename (s
.file
);
12153 if (get_AT_file (old_die
, DW_AT_decl_file
) != file_index
)
12154 add_AT_file (var_die
, DW_AT_decl_file
, file_index
);
12156 if (get_AT_unsigned (old_die
, DW_AT_decl_line
) != (unsigned) s
.line
)
12157 add_AT_unsigned (var_die
, DW_AT_decl_line
, s
.line
);
12162 add_name_and_src_coords_attributes (var_die
, decl
);
12163 add_type_attribute (var_die
, TREE_TYPE (decl
), TREE_READONLY (decl
),
12164 TREE_THIS_VOLATILE (decl
), context_die
);
12166 if (TREE_PUBLIC (decl
))
12167 add_AT_flag (var_die
, DW_AT_external
, 1);
12169 if (DECL_ARTIFICIAL (decl
))
12170 add_AT_flag (var_die
, DW_AT_artificial
, 1);
12172 if (TREE_PROTECTED (decl
))
12173 add_AT_unsigned (var_die
, DW_AT_accessibility
, DW_ACCESS_protected
);
12174 else if (TREE_PRIVATE (decl
))
12175 add_AT_unsigned (var_die
, DW_AT_accessibility
, DW_ACCESS_private
);
12179 add_AT_flag (var_die
, DW_AT_declaration
, 1);
12181 if (DECL_ABSTRACT (decl
) || declaration
)
12182 equate_decl_number_to_die (decl
, var_die
);
12184 if (! declaration
&& ! DECL_ABSTRACT (decl
))
12186 add_location_or_const_value_attribute (var_die
, decl
, DW_AT_location
);
12187 add_pubname (decl
, var_die
);
12190 tree_add_const_value_attribute (var_die
, decl
);
12193 /* Generate a DIE to represent a label identifier. */
12196 gen_label_die (tree decl
, dw_die_ref context_die
)
12198 tree origin
= decl_ultimate_origin (decl
);
12199 dw_die_ref lbl_die
= new_die (DW_TAG_label
, context_die
, decl
);
12201 char label
[MAX_ARTIFICIAL_LABEL_BYTES
];
12203 if (origin
!= NULL
)
12204 add_abstract_origin_attribute (lbl_die
, origin
);
12206 add_name_and_src_coords_attributes (lbl_die
, decl
);
12208 if (DECL_ABSTRACT (decl
))
12209 equate_decl_number_to_die (decl
, lbl_die
);
12212 insn
= DECL_RTL_IF_SET (decl
);
12214 /* Deleted labels are programmer specified labels which have been
12215 eliminated because of various optimizations. We still emit them
12216 here so that it is possible to put breakpoints on them. */
12220 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_DELETED_LABEL
))))
12222 /* When optimization is enabled (via -O) some parts of the compiler
12223 (e.g. jump.c and cse.c) may try to delete CODE_LABEL insns which
12224 represent source-level labels which were explicitly declared by
12225 the user. This really shouldn't be happening though, so catch
12226 it if it ever does happen. */
12227 gcc_assert (!INSN_DELETED_P (insn
));
12229 ASM_GENERATE_INTERNAL_LABEL (label
, "L", CODE_LABEL_NUMBER (insn
));
12230 add_AT_lbl_id (lbl_die
, DW_AT_low_pc
, label
);
12235 /* A helper function for gen_inlined_subroutine_die. Add source coordinate
12236 attributes to the DIE for a block STMT, to describe where the inlined
12237 function was called from. This is similar to add_src_coords_attributes. */
12240 add_call_src_coords_attributes (tree stmt
, dw_die_ref die
)
12242 expanded_location s
= expand_location (BLOCK_SOURCE_LOCATION (stmt
));
12244 add_AT_file (die
, DW_AT_call_file
, lookup_filename (s
.file
));
12245 add_AT_unsigned (die
, DW_AT_call_line
, s
.line
);
12249 /* If STMT's abstract origin is a function declaration and STMT's
12250 first subblock's abstract origin is the function's outermost block,
12251 then we're looking at the main entry point. */
12253 is_inlined_entry_point (tree stmt
)
12257 if (!stmt
|| TREE_CODE (stmt
) != BLOCK
)
12260 decl
= block_ultimate_origin (stmt
);
12262 if (!decl
|| TREE_CODE (decl
) != FUNCTION_DECL
)
12265 block
= BLOCK_SUBBLOCKS (stmt
);
12269 if (TREE_CODE (block
) != BLOCK
)
12272 block
= block_ultimate_origin (block
);
12275 return block
== DECL_INITIAL (decl
);
12278 /* A helper function for gen_lexical_block_die and gen_inlined_subroutine_die.
12279 Add low_pc and high_pc attributes to the DIE for a block STMT. */
12282 add_high_low_attributes (tree stmt
, dw_die_ref die
)
12284 char label
[MAX_ARTIFICIAL_LABEL_BYTES
];
12286 if (BLOCK_FRAGMENT_CHAIN (stmt
))
12290 if (is_inlined_entry_point (stmt
))
12292 ASM_GENERATE_INTERNAL_LABEL (label
, BLOCK_BEGIN_LABEL
,
12293 BLOCK_NUMBER (stmt
));
12294 add_AT_lbl_id (die
, DW_AT_entry_pc
, label
);
12297 add_AT_range_list (die
, DW_AT_ranges
, add_ranges (stmt
));
12299 chain
= BLOCK_FRAGMENT_CHAIN (stmt
);
12302 add_ranges (chain
);
12303 chain
= BLOCK_FRAGMENT_CHAIN (chain
);
12310 ASM_GENERATE_INTERNAL_LABEL (label
, BLOCK_BEGIN_LABEL
,
12311 BLOCK_NUMBER (stmt
));
12312 add_AT_lbl_id (die
, DW_AT_low_pc
, label
);
12313 ASM_GENERATE_INTERNAL_LABEL (label
, BLOCK_END_LABEL
,
12314 BLOCK_NUMBER (stmt
));
12315 add_AT_lbl_id (die
, DW_AT_high_pc
, label
);
12319 /* Generate a DIE for a lexical block. */
12322 gen_lexical_block_die (tree stmt
, dw_die_ref context_die
, int depth
)
12324 dw_die_ref stmt_die
= new_die (DW_TAG_lexical_block
, context_die
, stmt
);
12326 if (! BLOCK_ABSTRACT (stmt
))
12327 add_high_low_attributes (stmt
, stmt_die
);
12329 decls_for_scope (stmt
, stmt_die
, depth
);
12332 /* Generate a DIE for an inlined subprogram. */
12335 gen_inlined_subroutine_die (tree stmt
, dw_die_ref context_die
, int depth
)
12337 tree decl
= block_ultimate_origin (stmt
);
12339 /* Emit info for the abstract instance first, if we haven't yet. We
12340 must emit this even if the block is abstract, otherwise when we
12341 emit the block below (or elsewhere), we may end up trying to emit
12342 a die whose origin die hasn't been emitted, and crashing. */
12343 dwarf2out_abstract_function (decl
);
12345 if (! BLOCK_ABSTRACT (stmt
))
12347 dw_die_ref subr_die
12348 = new_die (DW_TAG_inlined_subroutine
, context_die
, stmt
);
12350 add_abstract_origin_attribute (subr_die
, decl
);
12351 add_high_low_attributes (stmt
, subr_die
);
12352 add_call_src_coords_attributes (stmt
, subr_die
);
12354 decls_for_scope (stmt
, subr_die
, depth
);
12355 current_function_has_inlines
= 1;
12358 /* We may get here if we're the outer block of function A that was
12359 inlined into function B that was inlined into function C. When
12360 generating debugging info for C, dwarf2out_abstract_function(B)
12361 would mark all inlined blocks as abstract, including this one.
12362 So, we wouldn't (and shouldn't) expect labels to be generated
12363 for this one. Instead, just emit debugging info for
12364 declarations within the block. This is particularly important
12365 in the case of initializers of arguments passed from B to us:
12366 if they're statement expressions containing declarations, we
12367 wouldn't generate dies for their abstract variables, and then,
12368 when generating dies for the real variables, we'd die (pun
12370 gen_lexical_block_die (stmt
, context_die
, depth
);
12373 /* Generate a DIE for a field in a record, or structure. */
12376 gen_field_die (tree decl
, dw_die_ref context_die
)
12378 dw_die_ref decl_die
;
12380 if (TREE_TYPE (decl
) == error_mark_node
)
12383 decl_die
= new_die (DW_TAG_member
, context_die
, decl
);
12384 add_name_and_src_coords_attributes (decl_die
, decl
);
12385 add_type_attribute (decl_die
, member_declared_type (decl
),
12386 TREE_READONLY (decl
), TREE_THIS_VOLATILE (decl
),
12389 if (DECL_BIT_FIELD_TYPE (decl
))
12391 add_byte_size_attribute (decl_die
, decl
);
12392 add_bit_size_attribute (decl_die
, decl
);
12393 add_bit_offset_attribute (decl_die
, decl
);
12396 if (TREE_CODE (DECL_FIELD_CONTEXT (decl
)) != UNION_TYPE
)
12397 add_data_member_location_attribute (decl_die
, decl
);
12399 if (DECL_ARTIFICIAL (decl
))
12400 add_AT_flag (decl_die
, DW_AT_artificial
, 1);
12402 if (TREE_PROTECTED (decl
))
12403 add_AT_unsigned (decl_die
, DW_AT_accessibility
, DW_ACCESS_protected
);
12404 else if (TREE_PRIVATE (decl
))
12405 add_AT_unsigned (decl_die
, DW_AT_accessibility
, DW_ACCESS_private
);
12407 /* Equate decl number to die, so that we can look up this decl later on. */
12408 equate_decl_number_to_die (decl
, decl_die
);
12412 /* Don't generate either pointer_type DIEs or reference_type DIEs here.
12413 Use modified_type_die instead.
12414 We keep this code here just in case these types of DIEs may be needed to
12415 represent certain things in other languages (e.g. Pascal) someday. */
12418 gen_pointer_type_die (tree type
, dw_die_ref context_die
)
12421 = new_die (DW_TAG_pointer_type
, scope_die_for (type
, context_die
), type
);
12423 equate_type_number_to_die (type
, ptr_die
);
12424 add_type_attribute (ptr_die
, TREE_TYPE (type
), 0, 0, context_die
);
12425 add_AT_unsigned (mod_type_die
, DW_AT_byte_size
, PTR_SIZE
);
12428 /* Don't generate either pointer_type DIEs or reference_type DIEs here.
12429 Use modified_type_die instead.
12430 We keep this code here just in case these types of DIEs may be needed to
12431 represent certain things in other languages (e.g. Pascal) someday. */
12434 gen_reference_type_die (tree type
, dw_die_ref context_die
)
12437 = new_die (DW_TAG_reference_type
, scope_die_for (type
, context_die
), type
);
12439 equate_type_number_to_die (type
, ref_die
);
12440 add_type_attribute (ref_die
, TREE_TYPE (type
), 0, 0, context_die
);
12441 add_AT_unsigned (mod_type_die
, DW_AT_byte_size
, PTR_SIZE
);
12445 /* Generate a DIE for a pointer to a member type. */
12448 gen_ptr_to_mbr_type_die (tree type
, dw_die_ref context_die
)
12451 = new_die (DW_TAG_ptr_to_member_type
,
12452 scope_die_for (type
, context_die
), type
);
12454 equate_type_number_to_die (type
, ptr_die
);
12455 add_AT_die_ref (ptr_die
, DW_AT_containing_type
,
12456 lookup_type_die (TYPE_OFFSET_BASETYPE (type
)));
12457 add_type_attribute (ptr_die
, TREE_TYPE (type
), 0, 0, context_die
);
12460 /* Generate the DIE for the compilation unit. */
12463 gen_compile_unit_die (const char *filename
)
12466 char producer
[250];
12467 const char *language_string
= lang_hooks
.name
;
12470 die
= new_die (DW_TAG_compile_unit
, NULL
, NULL
);
12474 add_name_attribute (die
, filename
);
12475 /* Don't add cwd for <built-in>. */
12476 if (!IS_ABSOLUTE_PATH (filename
) && filename
[0] != '<')
12477 add_comp_dir_attribute (die
);
12480 sprintf (producer
, "%s %s", language_string
, version_string
);
12482 #ifdef MIPS_DEBUGGING_INFO
12483 /* The MIPS/SGI compilers place the 'cc' command line options in the producer
12484 string. The SGI debugger looks for -g, -g1, -g2, or -g3; if they do
12485 not appear in the producer string, the debugger reaches the conclusion
12486 that the object file is stripped and has no debugging information.
12487 To get the MIPS/SGI debugger to believe that there is debugging
12488 information in the object file, we add a -g to the producer string. */
12489 if (debug_info_level
> DINFO_LEVEL_TERSE
)
12490 strcat (producer
, " -g");
12493 add_AT_string (die
, DW_AT_producer
, producer
);
12495 if (strcmp (language_string
, "GNU C++") == 0)
12496 language
= DW_LANG_C_plus_plus
;
12497 else if (strcmp (language_string
, "GNU Ada") == 0)
12498 language
= DW_LANG_Ada95
;
12499 else if (strcmp (language_string
, "GNU F77") == 0)
12500 language
= DW_LANG_Fortran77
;
12501 else if (strcmp (language_string
, "GNU F95") == 0)
12502 language
= DW_LANG_Fortran95
;
12503 else if (strcmp (language_string
, "GNU Pascal") == 0)
12504 language
= DW_LANG_Pascal83
;
12505 else if (strcmp (language_string
, "GNU Java") == 0)
12506 language
= DW_LANG_Java
;
12507 else if (strcmp (language_string
, "GNU Objective-C") == 0)
12508 language
= DW_LANG_ObjC
;
12509 else if (strcmp (language_string
, "GNU Objective-C++") == 0)
12510 language
= DW_LANG_ObjC_plus_plus
;
12512 language
= DW_LANG_C89
;
12514 add_AT_unsigned (die
, DW_AT_language
, language
);
12518 /* Generate the DIE for a base class. */
12521 gen_inheritance_die (tree binfo
, tree access
, dw_die_ref context_die
)
12523 dw_die_ref die
= new_die (DW_TAG_inheritance
, context_die
, binfo
);
12525 add_type_attribute (die
, BINFO_TYPE (binfo
), 0, 0, context_die
);
12526 add_data_member_location_attribute (die
, binfo
);
12528 if (BINFO_VIRTUAL_P (binfo
))
12529 add_AT_unsigned (die
, DW_AT_virtuality
, DW_VIRTUALITY_virtual
);
12531 if (access
== access_public_node
)
12532 add_AT_unsigned (die
, DW_AT_accessibility
, DW_ACCESS_public
);
12533 else if (access
== access_protected_node
)
12534 add_AT_unsigned (die
, DW_AT_accessibility
, DW_ACCESS_protected
);
12537 /* Generate a DIE for a class member. */
12540 gen_member_die (tree type
, dw_die_ref context_die
)
12543 tree binfo
= TYPE_BINFO (type
);
12546 /* If this is not an incomplete type, output descriptions of each of its
12547 members. Note that as we output the DIEs necessary to represent the
12548 members of this record or union type, we will also be trying to output
12549 DIEs to represent the *types* of those members. However the `type'
12550 function (above) will specifically avoid generating type DIEs for member
12551 types *within* the list of member DIEs for this (containing) type except
12552 for those types (of members) which are explicitly marked as also being
12553 members of this (containing) type themselves. The g++ front- end can
12554 force any given type to be treated as a member of some other (containing)
12555 type by setting the TYPE_CONTEXT of the given (member) type to point to
12556 the TREE node representing the appropriate (containing) type. */
12558 /* First output info about the base classes. */
12561 VEC(tree
,gc
) *accesses
= BINFO_BASE_ACCESSES (binfo
);
12565 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base
); i
++)
12566 gen_inheritance_die (base
,
12567 (accesses
? VEC_index (tree
, accesses
, i
)
12568 : access_public_node
), context_die
);
12571 /* Now output info about the data members and type members. */
12572 for (member
= TYPE_FIELDS (type
); member
; member
= TREE_CHAIN (member
))
12574 /* If we thought we were generating minimal debug info for TYPE
12575 and then changed our minds, some of the member declarations
12576 may have already been defined. Don't define them again, but
12577 do put them in the right order. */
12579 child
= lookup_decl_die (member
);
12581 splice_child_die (context_die
, child
);
12583 gen_decl_die (member
, context_die
);
12586 /* Now output info about the function members (if any). */
12587 for (member
= TYPE_METHODS (type
); member
; member
= TREE_CHAIN (member
))
12589 /* Don't include clones in the member list. */
12590 if (DECL_ABSTRACT_ORIGIN (member
))
12593 child
= lookup_decl_die (member
);
12595 splice_child_die (context_die
, child
);
12597 gen_decl_die (member
, context_die
);
12601 /* Generate a DIE for a structure or union type. If TYPE_DECL_SUPPRESS_DEBUG
12602 is set, we pretend that the type was never defined, so we only get the
12603 member DIEs needed by later specification DIEs. */
12606 gen_struct_or_union_type_die (tree type
, dw_die_ref context_die
)
12608 dw_die_ref type_die
= lookup_type_die (type
);
12609 dw_die_ref scope_die
= 0;
12611 int complete
= (TYPE_SIZE (type
)
12612 && (! TYPE_STUB_DECL (type
)
12613 || ! TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (type
))));
12614 int ns_decl
= (context_die
&& context_die
->die_tag
== DW_TAG_namespace
);
12616 if (type_die
&& ! complete
)
12619 if (TYPE_CONTEXT (type
) != NULL_TREE
12620 && (AGGREGATE_TYPE_P (TYPE_CONTEXT (type
))
12621 || TREE_CODE (TYPE_CONTEXT (type
)) == NAMESPACE_DECL
))
12624 scope_die
= scope_die_for (type
, context_die
);
12626 if (! type_die
|| (nested
&& scope_die
== comp_unit_die
))
12627 /* First occurrence of type or toplevel definition of nested class. */
12629 dw_die_ref old_die
= type_die
;
12631 type_die
= new_die (TREE_CODE (type
) == RECORD_TYPE
12632 ? DW_TAG_structure_type
: DW_TAG_union_type
,
12634 equate_type_number_to_die (type
, type_die
);
12636 add_AT_specification (type_die
, old_die
);
12638 add_name_attribute (type_die
, type_tag (type
));
12641 remove_AT (type_die
, DW_AT_declaration
);
12643 /* If this type has been completed, then give it a byte_size attribute and
12644 then give a list of members. */
12645 if (complete
&& !ns_decl
)
12647 /* Prevent infinite recursion in cases where the type of some member of
12648 this type is expressed in terms of this type itself. */
12649 TREE_ASM_WRITTEN (type
) = 1;
12650 add_byte_size_attribute (type_die
, type
);
12651 if (TYPE_STUB_DECL (type
) != NULL_TREE
)
12652 add_src_coords_attributes (type_die
, TYPE_STUB_DECL (type
));
12654 /* If the first reference to this type was as the return type of an
12655 inline function, then it may not have a parent. Fix this now. */
12656 if (type_die
->die_parent
== NULL
)
12657 add_child_die (scope_die
, type_die
);
12659 push_decl_scope (type
);
12660 gen_member_die (type
, type_die
);
12663 /* GNU extension: Record what type our vtable lives in. */
12664 if (TYPE_VFIELD (type
))
12666 tree vtype
= DECL_FCONTEXT (TYPE_VFIELD (type
));
12668 gen_type_die (vtype
, context_die
);
12669 add_AT_die_ref (type_die
, DW_AT_containing_type
,
12670 lookup_type_die (vtype
));
12675 add_AT_flag (type_die
, DW_AT_declaration
, 1);
12677 /* We don't need to do this for function-local types. */
12678 if (TYPE_STUB_DECL (type
)
12679 && ! decl_function_context (TYPE_STUB_DECL (type
)))
12680 VEC_safe_push (tree
, gc
, incomplete_types
, type
);
12683 if (get_AT (type_die
, DW_AT_name
))
12684 add_pubtype (type
, type_die
);
12687 /* Generate a DIE for a subroutine _type_. */
12690 gen_subroutine_type_die (tree type
, dw_die_ref context_die
)
12692 tree return_type
= TREE_TYPE (type
);
12693 dw_die_ref subr_die
12694 = new_die (DW_TAG_subroutine_type
,
12695 scope_die_for (type
, context_die
), type
);
12697 equate_type_number_to_die (type
, subr_die
);
12698 add_prototyped_attribute (subr_die
, type
);
12699 add_type_attribute (subr_die
, return_type
, 0, 0, context_die
);
12700 gen_formal_types_die (type
, subr_die
);
12702 if (get_AT (subr_die
, DW_AT_name
))
12703 add_pubtype (type
, subr_die
);
12706 /* Generate a DIE for a type definition. */
12709 gen_typedef_die (tree decl
, dw_die_ref context_die
)
12711 dw_die_ref type_die
;
12714 if (TREE_ASM_WRITTEN (decl
))
12717 TREE_ASM_WRITTEN (decl
) = 1;
12718 type_die
= new_die (DW_TAG_typedef
, context_die
, decl
);
12719 origin
= decl_ultimate_origin (decl
);
12720 if (origin
!= NULL
)
12721 add_abstract_origin_attribute (type_die
, origin
);
12726 add_name_and_src_coords_attributes (type_die
, decl
);
12727 if (DECL_ORIGINAL_TYPE (decl
))
12729 type
= DECL_ORIGINAL_TYPE (decl
);
12731 gcc_assert (type
!= TREE_TYPE (decl
));
12732 equate_type_number_to_die (TREE_TYPE (decl
), type_die
);
12735 type
= TREE_TYPE (decl
);
12737 add_type_attribute (type_die
, type
, TREE_READONLY (decl
),
12738 TREE_THIS_VOLATILE (decl
), context_die
);
12741 if (DECL_ABSTRACT (decl
))
12742 equate_decl_number_to_die (decl
, type_die
);
12744 if (get_AT (type_die
, DW_AT_name
))
12745 add_pubtype (decl
, type_die
);
12748 /* Generate a type description DIE. */
12751 gen_type_die (tree type
, dw_die_ref context_die
)
12755 if (type
== NULL_TREE
|| type
== error_mark_node
)
12758 if (TYPE_NAME (type
) && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
12759 && DECL_ORIGINAL_TYPE (TYPE_NAME (type
)))
12761 if (TREE_ASM_WRITTEN (type
))
12764 /* Prevent broken recursion; we can't hand off to the same type. */
12765 gcc_assert (DECL_ORIGINAL_TYPE (TYPE_NAME (type
)) != type
);
12767 TREE_ASM_WRITTEN (type
) = 1;
12768 gen_decl_die (TYPE_NAME (type
), context_die
);
12772 /* We are going to output a DIE to represent the unqualified version
12773 of this type (i.e. without any const or volatile qualifiers) so
12774 get the main variant (i.e. the unqualified version) of this type
12775 now. (Vectors are special because the debugging info is in the
12776 cloned type itself). */
12777 if (TREE_CODE (type
) != VECTOR_TYPE
)
12778 type
= type_main_variant (type
);
12780 if (TREE_ASM_WRITTEN (type
))
12783 switch (TREE_CODE (type
))
12789 case REFERENCE_TYPE
:
12790 /* We must set TREE_ASM_WRITTEN in case this is a recursive type. This
12791 ensures that the gen_type_die recursion will terminate even if the
12792 type is recursive. Recursive types are possible in Ada. */
12793 /* ??? We could perhaps do this for all types before the switch
12795 TREE_ASM_WRITTEN (type
) = 1;
12797 /* For these types, all that is required is that we output a DIE (or a
12798 set of DIEs) to represent the "basis" type. */
12799 gen_type_die (TREE_TYPE (type
), context_die
);
12803 /* This code is used for C++ pointer-to-data-member types.
12804 Output a description of the relevant class type. */
12805 gen_type_die (TYPE_OFFSET_BASETYPE (type
), context_die
);
12807 /* Output a description of the type of the object pointed to. */
12808 gen_type_die (TREE_TYPE (type
), context_die
);
12810 /* Now output a DIE to represent this pointer-to-data-member type
12812 gen_ptr_to_mbr_type_die (type
, context_die
);
12815 case FUNCTION_TYPE
:
12816 /* Force out return type (in case it wasn't forced out already). */
12817 gen_type_die (TREE_TYPE (type
), context_die
);
12818 gen_subroutine_type_die (type
, context_die
);
12822 /* Force out return type (in case it wasn't forced out already). */
12823 gen_type_die (TREE_TYPE (type
), context_die
);
12824 gen_subroutine_type_die (type
, context_die
);
12828 gen_array_type_die (type
, context_die
);
12832 gen_array_type_die (type
, context_die
);
12835 case ENUMERAL_TYPE
:
12838 case QUAL_UNION_TYPE
:
12839 /* If this is a nested type whose containing class hasn't been written
12840 out yet, writing it out will cover this one, too. This does not apply
12841 to instantiations of member class templates; they need to be added to
12842 the containing class as they are generated. FIXME: This hurts the
12843 idea of combining type decls from multiple TUs, since we can't predict
12844 what set of template instantiations we'll get. */
12845 if (TYPE_CONTEXT (type
)
12846 && AGGREGATE_TYPE_P (TYPE_CONTEXT (type
))
12847 && ! TREE_ASM_WRITTEN (TYPE_CONTEXT (type
)))
12849 gen_type_die (TYPE_CONTEXT (type
), context_die
);
12851 if (TREE_ASM_WRITTEN (type
))
12854 /* If that failed, attach ourselves to the stub. */
12855 push_decl_scope (TYPE_CONTEXT (type
));
12856 context_die
= lookup_type_die (TYPE_CONTEXT (type
));
12861 declare_in_namespace (type
, context_die
);
12865 if (TREE_CODE (type
) == ENUMERAL_TYPE
)
12867 /* This might have been written out by the call to
12868 declare_in_namespace. */
12869 if (!TREE_ASM_WRITTEN (type
))
12870 gen_enumeration_type_die (type
, context_die
);
12873 gen_struct_or_union_type_die (type
, context_die
);
12878 /* Don't set TREE_ASM_WRITTEN on an incomplete struct; we want to fix
12879 it up if it is ever completed. gen_*_type_die will set it for us
12880 when appropriate. */
12888 /* No DIEs needed for fundamental types. */
12892 /* No Dwarf representation currently defined. */
12896 gcc_unreachable ();
12899 TREE_ASM_WRITTEN (type
) = 1;
12902 /* Generate a DIE for a tagged type instantiation. */
12905 gen_tagged_type_instantiation_die (tree type
, dw_die_ref context_die
)
12907 if (type
== NULL_TREE
|| type
== error_mark_node
)
12910 /* We are going to output a DIE to represent the unqualified version of
12911 this type (i.e. without any const or volatile qualifiers) so make sure
12912 that we have the main variant (i.e. the unqualified version) of this
12914 gcc_assert (type
== type_main_variant (type
));
12916 /* Do not check TREE_ASM_WRITTEN (type) as it may not be set if this is
12917 an instance of an unresolved type. */
12919 switch (TREE_CODE (type
))
12924 case ENUMERAL_TYPE
:
12925 gen_inlined_enumeration_type_die (type
, context_die
);
12929 gen_inlined_structure_type_die (type
, context_die
);
12933 case QUAL_UNION_TYPE
:
12934 gen_inlined_union_type_die (type
, context_die
);
12938 gcc_unreachable ();
12942 /* Generate a DW_TAG_lexical_block DIE followed by DIEs to represent all of the
12943 things which are local to the given block. */
12946 gen_block_die (tree stmt
, dw_die_ref context_die
, int depth
)
12948 int must_output_die
= 0;
12951 enum tree_code origin_code
;
12953 /* Ignore blocks that are NULL. */
12954 if (stmt
== NULL_TREE
)
12957 /* If the block is one fragment of a non-contiguous block, do not
12958 process the variables, since they will have been done by the
12959 origin block. Do process subblocks. */
12960 if (BLOCK_FRAGMENT_ORIGIN (stmt
))
12964 for (sub
= BLOCK_SUBBLOCKS (stmt
); sub
; sub
= BLOCK_CHAIN (sub
))
12965 gen_block_die (sub
, context_die
, depth
+ 1);
12970 /* Determine the "ultimate origin" of this block. This block may be an
12971 inlined instance of an inlined instance of inline function, so we have
12972 to trace all of the way back through the origin chain to find out what
12973 sort of node actually served as the original seed for the creation of
12974 the current block. */
12975 origin
= block_ultimate_origin (stmt
);
12976 origin_code
= (origin
!= NULL
) ? TREE_CODE (origin
) : ERROR_MARK
;
12978 /* Determine if we need to output any Dwarf DIEs at all to represent this
12980 if (origin_code
== FUNCTION_DECL
)
12981 /* The outer scopes for inlinings *must* always be represented. We
12982 generate DW_TAG_inlined_subroutine DIEs for them. (See below.) */
12983 must_output_die
= 1;
12986 /* In the case where the current block represents an inlining of the
12987 "body block" of an inline function, we must *NOT* output any DIE for
12988 this block because we have already output a DIE to represent the whole
12989 inlined function scope and the "body block" of any function doesn't
12990 really represent a different scope according to ANSI C rules. So we
12991 check here to make sure that this block does not represent a "body
12992 block inlining" before trying to set the MUST_OUTPUT_DIE flag. */
12993 if (! is_body_block (origin
? origin
: stmt
))
12995 /* Determine if this block directly contains any "significant"
12996 local declarations which we will need to output DIEs for. */
12997 if (debug_info_level
> DINFO_LEVEL_TERSE
)
12998 /* We are not in terse mode so *any* local declaration counts
12999 as being a "significant" one. */
13000 must_output_die
= (BLOCK_VARS (stmt
) != NULL
13001 && (TREE_USED (stmt
)
13002 || TREE_ASM_WRITTEN (stmt
)
13003 || BLOCK_ABSTRACT (stmt
)));
13005 /* We are in terse mode, so only local (nested) function
13006 definitions count as "significant" local declarations. */
13007 for (decl
= BLOCK_VARS (stmt
);
13008 decl
!= NULL
; decl
= TREE_CHAIN (decl
))
13009 if (TREE_CODE (decl
) == FUNCTION_DECL
13010 && DECL_INITIAL (decl
))
13012 must_output_die
= 1;
13018 /* It would be a waste of space to generate a Dwarf DW_TAG_lexical_block
13019 DIE for any block which contains no significant local declarations at
13020 all. Rather, in such cases we just call `decls_for_scope' so that any
13021 needed Dwarf info for any sub-blocks will get properly generated. Note
13022 that in terse mode, our definition of what constitutes a "significant"
13023 local declaration gets restricted to include only inlined function
13024 instances and local (nested) function definitions. */
13025 if (must_output_die
)
13027 if (origin_code
== FUNCTION_DECL
)
13028 gen_inlined_subroutine_die (stmt
, context_die
, depth
);
13030 gen_lexical_block_die (stmt
, context_die
, depth
);
13033 decls_for_scope (stmt
, context_die
, depth
);
13036 /* Generate all of the decls declared within a given scope and (recursively)
13037 all of its sub-blocks. */
13040 decls_for_scope (tree stmt
, dw_die_ref context_die
, int depth
)
13045 /* Ignore NULL blocks. */
13046 if (stmt
== NULL_TREE
)
13049 if (TREE_USED (stmt
))
13051 /* Output the DIEs to represent all of the data objects and typedefs
13052 declared directly within this block but not within any nested
13053 sub-blocks. Also, nested function and tag DIEs have been
13054 generated with a parent of NULL; fix that up now. */
13055 for (decl
= BLOCK_VARS (stmt
); decl
!= NULL
; decl
= TREE_CHAIN (decl
))
13059 if (TREE_CODE (decl
) == FUNCTION_DECL
)
13060 die
= lookup_decl_die (decl
);
13061 else if (TREE_CODE (decl
) == TYPE_DECL
&& TYPE_DECL_IS_STUB (decl
))
13062 die
= lookup_type_die (TREE_TYPE (decl
));
13066 if (die
!= NULL
&& die
->die_parent
== NULL
)
13067 add_child_die (context_die
, die
);
13068 /* Do not produce debug information for static variables since
13069 these might be optimized out. We are called for these later
13070 in varpool_analyze_pending_decls. */
13071 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
13074 gen_decl_die (decl
, context_die
);
13078 /* If we're at -g1, we're not interested in subblocks. */
13079 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13082 /* Output the DIEs to represent all sub-blocks (and the items declared
13083 therein) of this block. */
13084 for (subblocks
= BLOCK_SUBBLOCKS (stmt
);
13086 subblocks
= BLOCK_CHAIN (subblocks
))
13087 gen_block_die (subblocks
, context_die
, depth
+ 1);
13090 /* Is this a typedef we can avoid emitting? */
13093 is_redundant_typedef (tree decl
)
13095 if (TYPE_DECL_IS_STUB (decl
))
13098 if (DECL_ARTIFICIAL (decl
)
13099 && DECL_CONTEXT (decl
)
13100 && is_tagged_type (DECL_CONTEXT (decl
))
13101 && TREE_CODE (TYPE_NAME (DECL_CONTEXT (decl
))) == TYPE_DECL
13102 && DECL_NAME (decl
) == DECL_NAME (TYPE_NAME (DECL_CONTEXT (decl
))))
13103 /* Also ignore the artificial member typedef for the class name. */
13109 /* Returns the DIE for decl. A DIE will always be returned. */
13112 force_decl_die (tree decl
)
13114 dw_die_ref decl_die
;
13115 unsigned saved_external_flag
;
13116 tree save_fn
= NULL_TREE
;
13117 decl_die
= lookup_decl_die (decl
);
13120 dw_die_ref context_die
;
13121 tree decl_context
= DECL_CONTEXT (decl
);
13124 /* Find die that represents this context. */
13125 if (TYPE_P (decl_context
))
13126 context_die
= force_type_die (decl_context
);
13128 context_die
= force_decl_die (decl_context
);
13131 context_die
= comp_unit_die
;
13133 decl_die
= lookup_decl_die (decl
);
13137 switch (TREE_CODE (decl
))
13139 case FUNCTION_DECL
:
13140 /* Clear current_function_decl, so that gen_subprogram_die thinks
13141 that this is a declaration. At this point, we just want to force
13142 declaration die. */
13143 save_fn
= current_function_decl
;
13144 current_function_decl
= NULL_TREE
;
13145 gen_subprogram_die (decl
, context_die
);
13146 current_function_decl
= save_fn
;
13150 /* Set external flag to force declaration die. Restore it after
13151 gen_decl_die() call. */
13152 saved_external_flag
= DECL_EXTERNAL (decl
);
13153 DECL_EXTERNAL (decl
) = 1;
13154 gen_decl_die (decl
, context_die
);
13155 DECL_EXTERNAL (decl
) = saved_external_flag
;
13158 case NAMESPACE_DECL
:
13159 dwarf2out_decl (decl
);
13163 gcc_unreachable ();
13166 /* We should be able to find the DIE now. */
13168 decl_die
= lookup_decl_die (decl
);
13169 gcc_assert (decl_die
);
13175 /* Returns the DIE for TYPE, that must not be a base type. A DIE is
13176 always returned. */
13179 force_type_die (tree type
)
13181 dw_die_ref type_die
;
13183 type_die
= lookup_type_die (type
);
13186 dw_die_ref context_die
;
13187 if (TYPE_CONTEXT (type
))
13189 if (TYPE_P (TYPE_CONTEXT (type
)))
13190 context_die
= force_type_die (TYPE_CONTEXT (type
));
13192 context_die
= force_decl_die (TYPE_CONTEXT (type
));
13195 context_die
= comp_unit_die
;
13197 type_die
= lookup_type_die (type
);
13200 gen_type_die (type
, context_die
);
13201 type_die
= lookup_type_die (type
);
13202 gcc_assert (type_die
);
13207 /* Force out any required namespaces to be able to output DECL,
13208 and return the new context_die for it, if it's changed. */
13211 setup_namespace_context (tree thing
, dw_die_ref context_die
)
13213 tree context
= (DECL_P (thing
)
13214 ? DECL_CONTEXT (thing
) : TYPE_CONTEXT (thing
));
13215 if (context
&& TREE_CODE (context
) == NAMESPACE_DECL
)
13216 /* Force out the namespace. */
13217 context_die
= force_decl_die (context
);
13219 return context_die
;
13222 /* Emit a declaration DIE for THING (which is either a DECL or a tagged
13223 type) within its namespace, if appropriate.
13225 For compatibility with older debuggers, namespace DIEs only contain
13226 declarations; all definitions are emitted at CU scope. */
13229 declare_in_namespace (tree thing
, dw_die_ref context_die
)
13231 dw_die_ref ns_context
;
13233 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13236 /* If this decl is from an inlined function, then don't try to emit it in its
13237 namespace, as we will get confused. It would have already been emitted
13238 when the abstract instance of the inline function was emitted anyways. */
13239 if (DECL_P (thing
) && DECL_ABSTRACT_ORIGIN (thing
))
13242 ns_context
= setup_namespace_context (thing
, context_die
);
13244 if (ns_context
!= context_die
)
13246 if (DECL_P (thing
))
13247 gen_decl_die (thing
, ns_context
);
13249 gen_type_die (thing
, ns_context
);
13253 /* Generate a DIE for a namespace or namespace alias. */
13256 gen_namespace_die (tree decl
)
13258 dw_die_ref context_die
= setup_namespace_context (decl
, comp_unit_die
);
13260 /* Namespace aliases have a DECL_ABSTRACT_ORIGIN of the namespace
13261 they are an alias of. */
13262 if (DECL_ABSTRACT_ORIGIN (decl
) == NULL
)
13264 /* Output a real namespace. */
13265 dw_die_ref namespace_die
13266 = new_die (DW_TAG_namespace
, context_die
, decl
);
13267 add_name_and_src_coords_attributes (namespace_die
, decl
);
13268 equate_decl_number_to_die (decl
, namespace_die
);
13272 /* Output a namespace alias. */
13274 /* Force out the namespace we are an alias of, if necessary. */
13275 dw_die_ref origin_die
13276 = force_decl_die (DECL_ABSTRACT_ORIGIN (decl
));
13278 /* Now create the namespace alias DIE. */
13279 dw_die_ref namespace_die
13280 = new_die (DW_TAG_imported_declaration
, context_die
, decl
);
13281 add_name_and_src_coords_attributes (namespace_die
, decl
);
13282 add_AT_die_ref (namespace_die
, DW_AT_import
, origin_die
);
13283 equate_decl_number_to_die (decl
, namespace_die
);
13287 /* Generate Dwarf debug information for a decl described by DECL. */
13290 gen_decl_die (tree decl
, dw_die_ref context_die
)
13294 if (DECL_P (decl
) && DECL_IGNORED_P (decl
))
13297 switch (TREE_CODE (decl
))
13303 /* The individual enumerators of an enum type get output when we output
13304 the Dwarf representation of the relevant enum type itself. */
13307 case FUNCTION_DECL
:
13308 /* Don't output any DIEs to represent mere function declarations,
13309 unless they are class members or explicit block externs. */
13310 if (DECL_INITIAL (decl
) == NULL_TREE
&& DECL_CONTEXT (decl
) == NULL_TREE
13311 && (current_function_decl
== NULL_TREE
|| DECL_ARTIFICIAL (decl
)))
13316 /* This doesn't work because the C frontend sets DECL_ABSTRACT_ORIGIN
13317 on local redeclarations of global functions. That seems broken. */
13318 if (current_function_decl
!= decl
)
13319 /* This is only a declaration. */;
13322 /* If we're emitting a clone, emit info for the abstract instance. */
13323 if (DECL_ORIGIN (decl
) != decl
)
13324 dwarf2out_abstract_function (DECL_ABSTRACT_ORIGIN (decl
));
13326 /* If we're emitting an out-of-line copy of an inline function,
13327 emit info for the abstract instance and set up to refer to it. */
13328 else if (cgraph_function_possibly_inlined_p (decl
)
13329 && ! DECL_ABSTRACT (decl
)
13330 && ! class_or_namespace_scope_p (context_die
)
13331 /* dwarf2out_abstract_function won't emit a die if this is just
13332 a declaration. We must avoid setting DECL_ABSTRACT_ORIGIN in
13333 that case, because that works only if we have a die. */
13334 && DECL_INITIAL (decl
) != NULL_TREE
)
13336 dwarf2out_abstract_function (decl
);
13337 set_decl_origin_self (decl
);
13340 /* Otherwise we're emitting the primary DIE for this decl. */
13341 else if (debug_info_level
> DINFO_LEVEL_TERSE
)
13343 /* Before we describe the FUNCTION_DECL itself, make sure that we
13344 have described its return type. */
13345 gen_type_die (TREE_TYPE (TREE_TYPE (decl
)), context_die
);
13347 /* And its virtual context. */
13348 if (DECL_VINDEX (decl
) != NULL_TREE
)
13349 gen_type_die (DECL_CONTEXT (decl
), context_die
);
13351 /* And its containing type. */
13352 origin
= decl_class_context (decl
);
13353 if (origin
!= NULL_TREE
)
13354 gen_type_die_for_member (origin
, decl
, context_die
);
13356 /* And its containing namespace. */
13357 declare_in_namespace (decl
, context_die
);
13360 /* Now output a DIE to represent the function itself. */
13361 gen_subprogram_die (decl
, context_die
);
13365 /* If we are in terse mode, don't generate any DIEs to represent any
13366 actual typedefs. */
13367 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13370 /* In the special case of a TYPE_DECL node representing the declaration
13371 of some type tag, if the given TYPE_DECL is marked as having been
13372 instantiated from some other (original) TYPE_DECL node (e.g. one which
13373 was generated within the original definition of an inline function) we
13374 have to generate a special (abbreviated) DW_TAG_structure_type,
13375 DW_TAG_union_type, or DW_TAG_enumeration_type DIE here. */
13376 if (TYPE_DECL_IS_STUB (decl
) && decl_ultimate_origin (decl
) != NULL_TREE
)
13378 gen_tagged_type_instantiation_die (TREE_TYPE (decl
), context_die
);
13382 if (is_redundant_typedef (decl
))
13383 gen_type_die (TREE_TYPE (decl
), context_die
);
13385 /* Output a DIE to represent the typedef itself. */
13386 gen_typedef_die (decl
, context_die
);
13390 if (debug_info_level
>= DINFO_LEVEL_NORMAL
)
13391 gen_label_die (decl
, context_die
);
13396 /* If we are in terse mode, don't generate any DIEs to represent any
13397 variable declarations or definitions. */
13398 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13401 /* Output any DIEs that are needed to specify the type of this data
13403 gen_type_die (TREE_TYPE (decl
), context_die
);
13405 /* And its containing type. */
13406 origin
= decl_class_context (decl
);
13407 if (origin
!= NULL_TREE
)
13408 gen_type_die_for_member (origin
, decl
, context_die
);
13410 /* And its containing namespace. */
13411 declare_in_namespace (decl
, context_die
);
13413 /* Now output the DIE to represent the data object itself. This gets
13414 complicated because of the possibility that the VAR_DECL really
13415 represents an inlined instance of a formal parameter for an inline
13417 origin
= decl_ultimate_origin (decl
);
13418 if (origin
!= NULL_TREE
&& TREE_CODE (origin
) == PARM_DECL
)
13419 gen_formal_parameter_die (decl
, context_die
);
13421 gen_variable_die (decl
, context_die
);
13425 /* Ignore the nameless fields that are used to skip bits but handle C++
13426 anonymous unions and structs. */
13427 if (DECL_NAME (decl
) != NULL_TREE
13428 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
13429 || TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
)
13431 gen_type_die (member_declared_type (decl
), context_die
);
13432 gen_field_die (decl
, context_die
);
13437 gen_type_die (TREE_TYPE (decl
), context_die
);
13438 gen_formal_parameter_die (decl
, context_die
);
13441 case NAMESPACE_DECL
:
13442 gen_namespace_die (decl
);
13446 /* Probably some frontend-internal decl. Assume we don't care. */
13447 gcc_assert ((int)TREE_CODE (decl
) > NUM_TREE_CODES
);
13452 /* Output debug information for global decl DECL. Called from toplev.c after
13453 compilation proper has finished. */
13456 dwarf2out_global_decl (tree decl
)
13458 /* Output DWARF2 information for file-scope tentative data object
13459 declarations, file-scope (extern) function declarations (which had no
13460 corresponding body) and file-scope tagged type declarations and
13461 definitions which have not yet been forced out. */
13462 if (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
))
13463 dwarf2out_decl (decl
);
13466 /* Output debug information for type decl DECL. Called from toplev.c
13467 and from language front ends (to record built-in types). */
13469 dwarf2out_type_decl (tree decl
, int local
)
13472 dwarf2out_decl (decl
);
13475 /* Output debug information for imported module or decl. */
13478 dwarf2out_imported_module_or_decl (tree decl
, tree context
)
13480 dw_die_ref imported_die
, at_import_die
;
13481 dw_die_ref scope_die
;
13482 expanded_location xloc
;
13484 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13489 /* To emit DW_TAG_imported_module or DW_TAG_imported_decl, we need two DIEs.
13490 We need decl DIE for reference and scope die. First, get DIE for the decl
13493 /* Get the scope die for decl context. Use comp_unit_die for global module
13494 or decl. If die is not found for non globals, force new die. */
13496 scope_die
= comp_unit_die
;
13497 else if (TYPE_P (context
))
13498 scope_die
= force_type_die (context
);
13500 scope_die
= force_decl_die (context
);
13502 /* For TYPE_DECL or CONST_DECL, lookup TREE_TYPE. */
13503 if (TREE_CODE (decl
) == TYPE_DECL
|| TREE_CODE (decl
) == CONST_DECL
)
13505 if (is_base_type (TREE_TYPE (decl
)))
13506 at_import_die
= base_type_die (TREE_TYPE (decl
));
13508 at_import_die
= force_type_die (TREE_TYPE (decl
));
13512 at_import_die
= lookup_decl_die (decl
);
13513 if (!at_import_die
)
13515 /* If we're trying to avoid duplicate debug info, we may not have
13516 emitted the member decl for this field. Emit it now. */
13517 if (TREE_CODE (decl
) == FIELD_DECL
)
13519 tree type
= DECL_CONTEXT (decl
);
13520 dw_die_ref type_context_die
;
13522 if (TYPE_CONTEXT (type
))
13523 if (TYPE_P (TYPE_CONTEXT (type
)))
13524 type_context_die
= force_type_die (TYPE_CONTEXT (type
));
13526 type_context_die
= force_decl_die (TYPE_CONTEXT (type
));
13528 type_context_die
= comp_unit_die
;
13529 gen_type_die_for_member (type
, decl
, type_context_die
);
13531 at_import_die
= force_decl_die (decl
);
13535 /* OK, now we have DIEs for decl as well as scope. Emit imported die. */
13536 if (TREE_CODE (decl
) == NAMESPACE_DECL
)
13537 imported_die
= new_die (DW_TAG_imported_module
, scope_die
, context
);
13539 imported_die
= new_die (DW_TAG_imported_declaration
, scope_die
, context
);
13541 xloc
= expand_location (input_location
);
13542 add_AT_file (imported_die
, DW_AT_decl_file
, lookup_filename (xloc
.file
));
13543 add_AT_unsigned (imported_die
, DW_AT_decl_line
, xloc
.line
);
13544 add_AT_die_ref (imported_die
, DW_AT_import
, at_import_die
);
13547 /* Write the debugging output for DECL. */
13550 dwarf2out_decl (tree decl
)
13552 dw_die_ref context_die
= comp_unit_die
;
13554 switch (TREE_CODE (decl
))
13559 case FUNCTION_DECL
:
13560 /* What we would really like to do here is to filter out all mere
13561 file-scope declarations of file-scope functions which are never
13562 referenced later within this translation unit (and keep all of ones
13563 that *are* referenced later on) but we aren't clairvoyant, so we have
13564 no idea which functions will be referenced in the future (i.e. later
13565 on within the current translation unit). So here we just ignore all
13566 file-scope function declarations which are not also definitions. If
13567 and when the debugger needs to know something about these functions,
13568 it will have to hunt around and find the DWARF information associated
13569 with the definition of the function.
13571 We can't just check DECL_EXTERNAL to find out which FUNCTION_DECL
13572 nodes represent definitions and which ones represent mere
13573 declarations. We have to check DECL_INITIAL instead. That's because
13574 the C front-end supports some weird semantics for "extern inline"
13575 function definitions. These can get inlined within the current
13576 translation unit (and thus, we need to generate Dwarf info for their
13577 abstract instances so that the Dwarf info for the concrete inlined
13578 instances can have something to refer to) but the compiler never
13579 generates any out-of-lines instances of such things (despite the fact
13580 that they *are* definitions).
13582 The important point is that the C front-end marks these "extern
13583 inline" functions as DECL_EXTERNAL, but we need to generate DWARF for
13584 them anyway. Note that the C++ front-end also plays some similar games
13585 for inline function definitions appearing within include files which
13586 also contain `#pragma interface' pragmas. */
13587 if (DECL_INITIAL (decl
) == NULL_TREE
)
13590 /* If we're a nested function, initially use a parent of NULL; if we're
13591 a plain function, this will be fixed up in decls_for_scope. If
13592 we're a method, it will be ignored, since we already have a DIE. */
13593 if (decl_function_context (decl
)
13594 /* But if we're in terse mode, we don't care about scope. */
13595 && debug_info_level
> DINFO_LEVEL_TERSE
)
13596 context_die
= NULL
;
13600 /* Ignore this VAR_DECL if it refers to a file-scope extern data object
13601 declaration and if the declaration was never even referenced from
13602 within this entire compilation unit. We suppress these DIEs in
13603 order to save space in the .debug section (by eliminating entries
13604 which are probably useless). Note that we must not suppress
13605 block-local extern declarations (whether used or not) because that
13606 would screw-up the debugger's name lookup mechanism and cause it to
13607 miss things which really ought to be in scope at a given point. */
13608 if (DECL_EXTERNAL (decl
) && !TREE_USED (decl
))
13611 /* For local statics lookup proper context die. */
13612 if (TREE_STATIC (decl
) && decl_function_context (decl
))
13613 context_die
= lookup_decl_die (DECL_CONTEXT (decl
));
13615 /* If we are in terse mode, don't generate any DIEs to represent any
13616 variable declarations or definitions. */
13617 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13621 case NAMESPACE_DECL
:
13622 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13624 if (lookup_decl_die (decl
) != NULL
)
13629 /* Don't emit stubs for types unless they are needed by other DIEs. */
13630 if (TYPE_DECL_SUPPRESS_DEBUG (decl
))
13633 /* Don't bother trying to generate any DIEs to represent any of the
13634 normal built-in types for the language we are compiling. */
13635 if (DECL_IS_BUILTIN (decl
))
13637 /* OK, we need to generate one for `bool' so GDB knows what type
13638 comparisons have. */
13640 && TREE_CODE (TREE_TYPE (decl
)) == BOOLEAN_TYPE
13641 && ! DECL_IGNORED_P (decl
))
13642 modified_type_die (TREE_TYPE (decl
), 0, 0, NULL
);
13647 /* If we are in terse mode, don't generate any DIEs for types. */
13648 if (debug_info_level
<= DINFO_LEVEL_TERSE
)
13651 /* If we're a function-scope tag, initially use a parent of NULL;
13652 this will be fixed up in decls_for_scope. */
13653 if (decl_function_context (decl
))
13654 context_die
= NULL
;
13662 gen_decl_die (decl
, context_die
);
13665 /* Output a marker (i.e. a label) for the beginning of the generated code for
13666 a lexical block. */
13669 dwarf2out_begin_block (unsigned int line ATTRIBUTE_UNUSED
,
13670 unsigned int blocknum
)
13672 switch_to_section (current_function_section ());
13673 ASM_OUTPUT_DEBUG_LABEL (asm_out_file
, BLOCK_BEGIN_LABEL
, blocknum
);
13676 /* Output a marker (i.e. a label) for the end of the generated code for a
13680 dwarf2out_end_block (unsigned int line ATTRIBUTE_UNUSED
, unsigned int blocknum
)
13682 switch_to_section (current_function_section ());
13683 ASM_OUTPUT_DEBUG_LABEL (asm_out_file
, BLOCK_END_LABEL
, blocknum
);
13686 /* Returns nonzero if it is appropriate not to emit any debugging
13687 information for BLOCK, because it doesn't contain any instructions.
13689 Don't allow this for blocks with nested functions or local classes
13690 as we would end up with orphans, and in the presence of scheduling
13691 we may end up calling them anyway. */
13694 dwarf2out_ignore_block (tree block
)
13698 for (decl
= BLOCK_VARS (block
); decl
; decl
= TREE_CHAIN (decl
))
13699 if (TREE_CODE (decl
) == FUNCTION_DECL
13700 || (TREE_CODE (decl
) == TYPE_DECL
&& TYPE_DECL_IS_STUB (decl
)))
13706 /* Hash table routines for file_hash. */
13709 file_table_eq (const void *p1_p
, const void *p2_p
)
13711 const struct dwarf_file_data
* p1
= p1_p
;
13712 const char * p2
= p2_p
;
13713 return strcmp (p1
->filename
, p2
) == 0;
13717 file_table_hash (const void *p_p
)
13719 const struct dwarf_file_data
* p
= p_p
;
13720 return htab_hash_string (p
->filename
);
13723 /* Lookup FILE_NAME (in the list of filenames that we know about here in
13724 dwarf2out.c) and return its "index". The index of each (known) filename is
13725 just a unique number which is associated with only that one filename. We
13726 need such numbers for the sake of generating labels (in the .debug_sfnames
13727 section) and references to those files numbers (in the .debug_srcinfo
13728 and.debug_macinfo sections). If the filename given as an argument is not
13729 found in our current list, add it to the list and assign it the next
13730 available unique index number. In order to speed up searches, we remember
13731 the index of the filename was looked up last. This handles the majority of
13734 static struct dwarf_file_data
*
13735 lookup_filename (const char *file_name
)
13738 struct dwarf_file_data
* created
;
13740 /* Check to see if the file name that was searched on the previous
13741 call matches this file name. If so, return the index. */
13742 if (file_table_last_lookup
13743 && (file_name
== file_table_last_lookup
->filename
13744 || strcmp (file_table_last_lookup
->filename
, file_name
) == 0))
13745 return file_table_last_lookup
;
13747 /* Didn't match the previous lookup, search the table. */
13748 slot
= htab_find_slot_with_hash (file_table
, file_name
,
13749 htab_hash_string (file_name
), INSERT
);
13753 created
= ggc_alloc (sizeof (struct dwarf_file_data
));
13754 created
->filename
= file_name
;
13755 created
->emitted_number
= 0;
13760 /* If the assembler will construct the file table, then translate the compiler
13761 internal file table number into the assembler file table number, and emit
13762 a .file directive if we haven't already emitted one yet. The file table
13763 numbers are different because we prune debug info for unused variables and
13764 types, which may include filenames. */
13767 maybe_emit_file (struct dwarf_file_data
* fd
)
13769 if (! fd
->emitted_number
)
13771 if (last_emitted_file
)
13772 fd
->emitted_number
= last_emitted_file
->emitted_number
+ 1;
13774 fd
->emitted_number
= 1;
13775 last_emitted_file
= fd
;
13777 if (DWARF2_ASM_LINE_DEBUG_INFO
)
13779 fprintf (asm_out_file
, "\t.file %u ", fd
->emitted_number
);
13780 output_quoted_string (asm_out_file
, fd
->filename
);
13781 fputc ('\n', asm_out_file
);
13785 return fd
->emitted_number
;
13788 /* Called by the final INSN scan whenever we see a var location. We
13789 use it to drop labels in the right places, and throw the location in
13790 our lookup table. */
13793 dwarf2out_var_location (rtx loc_note
)
13795 char loclabel
[MAX_ARTIFICIAL_LABEL_BYTES
];
13796 struct var_loc_node
*newloc
;
13798 static rtx last_insn
;
13799 static const char *last_label
;
13802 if (!DECL_P (NOTE_VAR_LOCATION_DECL (loc_note
)))
13804 prev_insn
= PREV_INSN (loc_note
);
13806 newloc
= ggc_alloc_cleared (sizeof (struct var_loc_node
));
13807 /* If the insn we processed last time is the previous insn
13808 and it is also a var location note, use the label we emitted
13810 if (last_insn
!= NULL_RTX
13811 && last_insn
== prev_insn
13812 && NOTE_P (prev_insn
)
13813 && NOTE_LINE_NUMBER (prev_insn
) == NOTE_INSN_VAR_LOCATION
)
13815 newloc
->label
= last_label
;
13819 ASM_GENERATE_INTERNAL_LABEL (loclabel
, "LVL", loclabel_num
);
13820 ASM_OUTPUT_DEBUG_LABEL (asm_out_file
, "LVL", loclabel_num
);
13822 newloc
->label
= ggc_strdup (loclabel
);
13824 newloc
->var_loc_note
= loc_note
;
13825 newloc
->next
= NULL
;
13827 if (cfun
&& in_cold_section_p
)
13828 newloc
->section_label
= cfun
->cold_section_label
;
13830 newloc
->section_label
= text_section_label
;
13832 last_insn
= loc_note
;
13833 last_label
= newloc
->label
;
13834 decl
= NOTE_VAR_LOCATION_DECL (loc_note
);
13835 add_var_loc_to_decl (decl
, newloc
);
13838 /* We need to reset the locations at the beginning of each
13839 function. We can't do this in the end_function hook, because the
13840 declarations that use the locations won't have been output when
13841 that hook is called. Also compute have_multiple_function_sections here. */
13844 dwarf2out_begin_function (tree fun
)
13846 htab_empty (decl_loc_table
);
13848 if (function_section (fun
) != text_section
)
13849 have_multiple_function_sections
= true;
13852 /* Output a label to mark the beginning of a source code line entry
13853 and record information relating to this source line, in
13854 'line_info_table' for later output of the .debug_line section. */
13857 dwarf2out_source_line (unsigned int line
, const char *filename
)
13859 if (debug_info_level
>= DINFO_LEVEL_NORMAL
13862 int file_num
= maybe_emit_file (lookup_filename (filename
));
13864 switch_to_section (current_function_section ());
13866 /* If requested, emit something human-readable. */
13867 if (flag_debug_asm
)
13868 fprintf (asm_out_file
, "\t%s %s:%d\n", ASM_COMMENT_START
,
13871 if (DWARF2_ASM_LINE_DEBUG_INFO
)
13873 /* Emit the .loc directive understood by GNU as. */
13874 fprintf (asm_out_file
, "\t.loc %d %d 0\n", file_num
, line
);
13876 /* Indicate that line number info exists. */
13877 line_info_table_in_use
++;
13879 else if (function_section (current_function_decl
) != text_section
)
13881 dw_separate_line_info_ref line_info
;
13882 targetm
.asm_out
.internal_label (asm_out_file
,
13883 SEPARATE_LINE_CODE_LABEL
,
13884 separate_line_info_table_in_use
);
13886 /* Expand the line info table if necessary. */
13887 if (separate_line_info_table_in_use
13888 == separate_line_info_table_allocated
)
13890 separate_line_info_table_allocated
+= LINE_INFO_TABLE_INCREMENT
;
13891 separate_line_info_table
13892 = ggc_realloc (separate_line_info_table
,
13893 separate_line_info_table_allocated
13894 * sizeof (dw_separate_line_info_entry
));
13895 memset (separate_line_info_table
13896 + separate_line_info_table_in_use
,
13898 (LINE_INFO_TABLE_INCREMENT
13899 * sizeof (dw_separate_line_info_entry
)));
13902 /* Add the new entry at the end of the line_info_table. */
13904 = &separate_line_info_table
[separate_line_info_table_in_use
++];
13905 line_info
->dw_file_num
= file_num
;
13906 line_info
->dw_line_num
= line
;
13907 line_info
->function
= current_function_funcdef_no
;
13911 dw_line_info_ref line_info
;
13913 targetm
.asm_out
.internal_label (asm_out_file
, LINE_CODE_LABEL
,
13914 line_info_table_in_use
);
13916 /* Expand the line info table if necessary. */
13917 if (line_info_table_in_use
== line_info_table_allocated
)
13919 line_info_table_allocated
+= LINE_INFO_TABLE_INCREMENT
;
13921 = ggc_realloc (line_info_table
,
13922 (line_info_table_allocated
13923 * sizeof (dw_line_info_entry
)));
13924 memset (line_info_table
+ line_info_table_in_use
, 0,
13925 LINE_INFO_TABLE_INCREMENT
* sizeof (dw_line_info_entry
));
13928 /* Add the new entry at the end of the line_info_table. */
13929 line_info
= &line_info_table
[line_info_table_in_use
++];
13930 line_info
->dw_file_num
= file_num
;
13931 line_info
->dw_line_num
= line
;
13936 /* Record the beginning of a new source file. */
13939 dwarf2out_start_source_file (unsigned int lineno
, const char *filename
)
13941 if (flag_eliminate_dwarf2_dups
)
13943 /* Record the beginning of the file for break_out_includes. */
13944 dw_die_ref bincl_die
;
13946 bincl_die
= new_die (DW_TAG_GNU_BINCL
, comp_unit_die
, NULL
);
13947 add_AT_string (bincl_die
, DW_AT_name
, filename
);
13950 if (debug_info_level
>= DINFO_LEVEL_VERBOSE
)
13952 int file_num
= maybe_emit_file (lookup_filename (filename
));
13954 switch_to_section (debug_macinfo_section
);
13955 dw2_asm_output_data (1, DW_MACINFO_start_file
, "Start new file");
13956 dw2_asm_output_data_uleb128 (lineno
, "Included from line number %d",
13959 dw2_asm_output_data_uleb128 (file_num
, "file %s", filename
);
13963 /* Record the end of a source file. */
13966 dwarf2out_end_source_file (unsigned int lineno ATTRIBUTE_UNUSED
)
13968 if (flag_eliminate_dwarf2_dups
)
13969 /* Record the end of the file for break_out_includes. */
13970 new_die (DW_TAG_GNU_EINCL
, comp_unit_die
, NULL
);
13972 if (debug_info_level
>= DINFO_LEVEL_VERBOSE
)
13974 switch_to_section (debug_macinfo_section
);
13975 dw2_asm_output_data (1, DW_MACINFO_end_file
, "End file");
13979 /* Called from debug_define in toplev.c. The `buffer' parameter contains
13980 the tail part of the directive line, i.e. the part which is past the
13981 initial whitespace, #, whitespace, directive-name, whitespace part. */
13984 dwarf2out_define (unsigned int lineno ATTRIBUTE_UNUSED
,
13985 const char *buffer ATTRIBUTE_UNUSED
)
13987 if (debug_info_level
>= DINFO_LEVEL_VERBOSE
)
13989 switch_to_section (debug_macinfo_section
);
13990 dw2_asm_output_data (1, DW_MACINFO_define
, "Define macro");
13991 dw2_asm_output_data_uleb128 (lineno
, "At line number %d", lineno
);
13992 dw2_asm_output_nstring (buffer
, -1, "The macro");
13996 /* Called from debug_undef in toplev.c. The `buffer' parameter contains
13997 the tail part of the directive line, i.e. the part which is past the
13998 initial whitespace, #, whitespace, directive-name, whitespace part. */
14001 dwarf2out_undef (unsigned int lineno ATTRIBUTE_UNUSED
,
14002 const char *buffer ATTRIBUTE_UNUSED
)
14004 if (debug_info_level
>= DINFO_LEVEL_VERBOSE
)
14006 switch_to_section (debug_macinfo_section
);
14007 dw2_asm_output_data (1, DW_MACINFO_undef
, "Undefine macro");
14008 dw2_asm_output_data_uleb128 (lineno
, "At line number %d", lineno
);
14009 dw2_asm_output_nstring (buffer
, -1, "The macro");
14013 /* Set up for Dwarf output at the start of compilation. */
14016 dwarf2out_init (const char *filename ATTRIBUTE_UNUSED
)
14018 /* Allocate the file_table. */
14019 file_table
= htab_create_ggc (50, file_table_hash
,
14020 file_table_eq
, NULL
);
14022 /* Allocate the decl_die_table. */
14023 decl_die_table
= htab_create_ggc (10, decl_die_table_hash
,
14024 decl_die_table_eq
, NULL
);
14026 /* Allocate the decl_loc_table. */
14027 decl_loc_table
= htab_create_ggc (10, decl_loc_table_hash
,
14028 decl_loc_table_eq
, NULL
);
14030 /* Allocate the initial hunk of the decl_scope_table. */
14031 decl_scope_table
= VEC_alloc (tree
, gc
, 256);
14033 /* Allocate the initial hunk of the abbrev_die_table. */
14034 abbrev_die_table
= ggc_alloc_cleared (ABBREV_DIE_TABLE_INCREMENT
14035 * sizeof (dw_die_ref
));
14036 abbrev_die_table_allocated
= ABBREV_DIE_TABLE_INCREMENT
;
14037 /* Zero-th entry is allocated, but unused. */
14038 abbrev_die_table_in_use
= 1;
14040 /* Allocate the initial hunk of the line_info_table. */
14041 line_info_table
= ggc_alloc_cleared (LINE_INFO_TABLE_INCREMENT
14042 * sizeof (dw_line_info_entry
));
14043 line_info_table_allocated
= LINE_INFO_TABLE_INCREMENT
;
14045 /* Zero-th entry is allocated, but unused. */
14046 line_info_table_in_use
= 1;
14048 /* Allocate the pubtypes and pubnames vectors. */
14049 pubname_table
= VEC_alloc (pubname_entry
, gc
, 32);
14050 pubtype_table
= VEC_alloc (pubname_entry
, gc
, 32);
14052 /* Generate the initial DIE for the .debug section. Note that the (string)
14053 value given in the DW_AT_name attribute of the DW_TAG_compile_unit DIE
14054 will (typically) be a relative pathname and that this pathname should be
14055 taken as being relative to the directory from which the compiler was
14056 invoked when the given (base) source file was compiled. We will fill
14057 in this value in dwarf2out_finish. */
14058 comp_unit_die
= gen_compile_unit_die (NULL
);
14060 incomplete_types
= VEC_alloc (tree
, gc
, 64);
14062 used_rtx_array
= VEC_alloc (rtx
, gc
, 32);
14064 debug_info_section
= get_section (DEBUG_INFO_SECTION
,
14065 SECTION_DEBUG
, NULL
);
14066 debug_abbrev_section
= get_section (DEBUG_ABBREV_SECTION
,
14067 SECTION_DEBUG
, NULL
);
14068 debug_aranges_section
= get_section (DEBUG_ARANGES_SECTION
,
14069 SECTION_DEBUG
, NULL
);
14070 debug_macinfo_section
= get_section (DEBUG_MACINFO_SECTION
,
14071 SECTION_DEBUG
, NULL
);
14072 debug_line_section
= get_section (DEBUG_LINE_SECTION
,
14073 SECTION_DEBUG
, NULL
);
14074 debug_loc_section
= get_section (DEBUG_LOC_SECTION
,
14075 SECTION_DEBUG
, NULL
);
14076 debug_pubnames_section
= get_section (DEBUG_PUBNAMES_SECTION
,
14077 SECTION_DEBUG
, NULL
);
14078 #ifdef DEBUG_PUBTYPES_SECTION
14079 debug_pubtypes_section
= get_section (DEBUG_PUBTYPES_SECTION
,
14080 SECTION_DEBUG
, NULL
);
14082 debug_str_section
= get_section (DEBUG_STR_SECTION
,
14083 DEBUG_STR_SECTION_FLAGS
, NULL
);
14084 debug_ranges_section
= get_section (DEBUG_RANGES_SECTION
,
14085 SECTION_DEBUG
, NULL
);
14086 debug_frame_section
= get_section (DEBUG_FRAME_SECTION
,
14087 SECTION_DEBUG
, NULL
);
14089 ASM_GENERATE_INTERNAL_LABEL (text_end_label
, TEXT_END_LABEL
, 0);
14090 ASM_GENERATE_INTERNAL_LABEL (abbrev_section_label
,
14091 DEBUG_ABBREV_SECTION_LABEL
, 0);
14092 ASM_GENERATE_INTERNAL_LABEL (text_section_label
, TEXT_SECTION_LABEL
, 0);
14093 ASM_GENERATE_INTERNAL_LABEL (cold_text_section_label
,
14094 COLD_TEXT_SECTION_LABEL
, 0);
14095 ASM_GENERATE_INTERNAL_LABEL (cold_end_label
, COLD_END_LABEL
, 0);
14097 ASM_GENERATE_INTERNAL_LABEL (debug_info_section_label
,
14098 DEBUG_INFO_SECTION_LABEL
, 0);
14099 ASM_GENERATE_INTERNAL_LABEL (debug_line_section_label
,
14100 DEBUG_LINE_SECTION_LABEL
, 0);
14101 ASM_GENERATE_INTERNAL_LABEL (ranges_section_label
,
14102 DEBUG_RANGES_SECTION_LABEL
, 0);
14103 switch_to_section (debug_abbrev_section
);
14104 ASM_OUTPUT_LABEL (asm_out_file
, abbrev_section_label
);
14105 switch_to_section (debug_info_section
);
14106 ASM_OUTPUT_LABEL (asm_out_file
, debug_info_section_label
);
14107 switch_to_section (debug_line_section
);
14108 ASM_OUTPUT_LABEL (asm_out_file
, debug_line_section_label
);
14110 if (debug_info_level
>= DINFO_LEVEL_VERBOSE
)
14112 switch_to_section (debug_macinfo_section
);
14113 ASM_GENERATE_INTERNAL_LABEL (macinfo_section_label
,
14114 DEBUG_MACINFO_SECTION_LABEL
, 0);
14115 ASM_OUTPUT_LABEL (asm_out_file
, macinfo_section_label
);
14118 switch_to_section (text_section
);
14119 ASM_OUTPUT_LABEL (asm_out_file
, text_section_label
);
14120 if (flag_reorder_blocks_and_partition
)
14122 switch_to_section (unlikely_text_section ());
14123 ASM_OUTPUT_LABEL (asm_out_file
, cold_text_section_label
);
14127 /* A helper function for dwarf2out_finish called through
14128 ht_forall. Emit one queued .debug_str string. */
14131 output_indirect_string (void **h
, void *v ATTRIBUTE_UNUSED
)
14133 struct indirect_string_node
*node
= (struct indirect_string_node
*) *h
;
14135 if (node
->form
== DW_FORM_strp
)
14137 switch_to_section (debug_str_section
);
14138 ASM_OUTPUT_LABEL (asm_out_file
, node
->label
);
14139 assemble_string (node
->str
, strlen (node
->str
) + 1);
14145 #if ENABLE_ASSERT_CHECKING
14146 /* Verify that all marks are clear. */
14149 verify_marks_clear (dw_die_ref die
)
14153 gcc_assert (! die
->die_mark
);
14154 FOR_EACH_CHILD (die
, c
, verify_marks_clear (c
));
14156 #endif /* ENABLE_ASSERT_CHECKING */
14158 /* Clear the marks for a die and its children.
14159 Be cool if the mark isn't set. */
14162 prune_unmark_dies (dw_die_ref die
)
14168 FOR_EACH_CHILD (die
, c
, prune_unmark_dies (c
));
14171 /* Given DIE that we're marking as used, find any other dies
14172 it references as attributes and mark them as used. */
14175 prune_unused_types_walk_attribs (dw_die_ref die
)
14180 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
14182 if (a
->dw_attr_val
.val_class
== dw_val_class_die_ref
)
14184 /* A reference to another DIE.
14185 Make sure that it will get emitted. */
14186 prune_unused_types_mark (a
->dw_attr_val
.v
.val_die_ref
.die
, 1);
14188 /* Set the string's refcount to 0 so that prune_unused_types_mark
14189 accounts properly for it. */
14190 if (AT_class (a
) == dw_val_class_str
)
14191 a
->dw_attr_val
.v
.val_str
->refcount
= 0;
14196 /* Mark DIE as being used. If DOKIDS is true, then walk down
14197 to DIE's children. */
14200 prune_unused_types_mark (dw_die_ref die
, int dokids
)
14204 if (die
->die_mark
== 0)
14206 /* We haven't done this node yet. Mark it as used. */
14209 /* We also have to mark its parents as used.
14210 (But we don't want to mark our parents' kids due to this.) */
14211 if (die
->die_parent
)
14212 prune_unused_types_mark (die
->die_parent
, 0);
14214 /* Mark any referenced nodes. */
14215 prune_unused_types_walk_attribs (die
);
14217 /* If this node is a specification,
14218 also mark the definition, if it exists. */
14219 if (get_AT_flag (die
, DW_AT_declaration
) && die
->die_definition
)
14220 prune_unused_types_mark (die
->die_definition
, 1);
14223 if (dokids
&& die
->die_mark
!= 2)
14225 /* We need to walk the children, but haven't done so yet.
14226 Remember that we've walked the kids. */
14229 /* If this is an array type, we need to make sure our
14230 kids get marked, even if they're types. */
14231 if (die
->die_tag
== DW_TAG_array_type
)
14232 FOR_EACH_CHILD (die
, c
, prune_unused_types_mark (c
, 1));
14234 FOR_EACH_CHILD (die
, c
, prune_unused_types_walk (c
));
14239 /* Walk the tree DIE and mark types that we actually use. */
14242 prune_unused_types_walk (dw_die_ref die
)
14246 /* Don't do anything if this node is already marked. */
14250 switch (die
->die_tag
)
14252 case DW_TAG_const_type
:
14253 case DW_TAG_packed_type
:
14254 case DW_TAG_pointer_type
:
14255 case DW_TAG_reference_type
:
14256 case DW_TAG_volatile_type
:
14257 case DW_TAG_typedef
:
14258 case DW_TAG_array_type
:
14259 case DW_TAG_structure_type
:
14260 case DW_TAG_union_type
:
14261 case DW_TAG_class_type
:
14262 case DW_TAG_friend
:
14263 case DW_TAG_variant_part
:
14264 case DW_TAG_enumeration_type
:
14265 case DW_TAG_subroutine_type
:
14266 case DW_TAG_string_type
:
14267 case DW_TAG_set_type
:
14268 case DW_TAG_subrange_type
:
14269 case DW_TAG_ptr_to_member_type
:
14270 case DW_TAG_file_type
:
14271 if (die
->die_perennial_p
)
14274 /* It's a type node --- don't mark it. */
14278 /* Mark everything else. */
14284 /* Now, mark any dies referenced from here. */
14285 prune_unused_types_walk_attribs (die
);
14287 /* Mark children. */
14288 FOR_EACH_CHILD (die
, c
, prune_unused_types_walk (c
));
14291 /* Increment the string counts on strings referred to from DIE's
14295 prune_unused_types_update_strings (dw_die_ref die
)
14300 for (ix
= 0; VEC_iterate (dw_attr_node
, die
->die_attr
, ix
, a
); ix
++)
14301 if (AT_class (a
) == dw_val_class_str
)
14303 struct indirect_string_node
*s
= a
->dw_attr_val
.v
.val_str
;
14305 /* Avoid unnecessarily putting strings that are used less than
14306 twice in the hash table. */
14308 == ((DEBUG_STR_SECTION_FLAGS
& SECTION_MERGE
) ? 1 : 2))
14311 slot
= htab_find_slot_with_hash (debug_str_hash
, s
->str
,
14312 htab_hash_string (s
->str
),
14314 gcc_assert (*slot
== NULL
);
14320 /* Remove from the tree DIE any dies that aren't marked. */
14323 prune_unused_types_prune (dw_die_ref die
)
14327 gcc_assert (die
->die_mark
);
14328 prune_unused_types_update_strings (die
);
14330 if (! die
->die_child
)
14333 c
= die
->die_child
;
14335 dw_die_ref prev
= c
;
14336 for (c
= c
->die_sib
; ! c
->die_mark
; c
= c
->die_sib
)
14337 if (c
== die
->die_child
)
14339 /* No marked children between 'prev' and the end of the list. */
14341 /* No marked children at all. */
14342 die
->die_child
= NULL
;
14345 prev
->die_sib
= c
->die_sib
;
14346 die
->die_child
= prev
;
14351 if (c
!= prev
->die_sib
)
14353 prune_unused_types_prune (c
);
14354 } while (c
!= die
->die_child
);
14358 /* Remove dies representing declarations that we never use. */
14361 prune_unused_types (void)
14364 limbo_die_node
*node
;
14367 #if ENABLE_ASSERT_CHECKING
14368 /* All the marks should already be clear. */
14369 verify_marks_clear (comp_unit_die
);
14370 for (node
= limbo_die_list
; node
; node
= node
->next
)
14371 verify_marks_clear (node
->die
);
14372 #endif /* ENABLE_ASSERT_CHECKING */
14374 /* Set the mark on nodes that are actually used. */
14375 prune_unused_types_walk (comp_unit_die
);
14376 for (node
= limbo_die_list
; node
; node
= node
->next
)
14377 prune_unused_types_walk (node
->die
);
14379 /* Also set the mark on nodes referenced from the
14380 pubname_table or arange_table. */
14381 for (i
= 0; VEC_iterate (pubname_entry
, pubname_table
, i
, pub
); i
++)
14382 prune_unused_types_mark (pub
->die
, 1);
14383 for (i
= 0; i
< arange_table_in_use
; i
++)
14384 prune_unused_types_mark (arange_table
[i
], 1);
14386 /* Get rid of nodes that aren't marked; and update the string counts. */
14387 if (debug_str_hash
)
14388 htab_empty (debug_str_hash
);
14389 prune_unused_types_prune (comp_unit_die
);
14390 for (node
= limbo_die_list
; node
; node
= node
->next
)
14391 prune_unused_types_prune (node
->die
);
14393 /* Leave the marks clear. */
14394 prune_unmark_dies (comp_unit_die
);
14395 for (node
= limbo_die_list
; node
; node
= node
->next
)
14396 prune_unmark_dies (node
->die
);
14399 /* Set the parameter to true if there are any relative pathnames in
14402 file_table_relative_p (void ** slot
, void *param
)
14405 struct dwarf_file_data
*d
= *slot
;
14406 if (d
->emitted_number
&& !IS_ABSOLUTE_PATH (d
->filename
))
14414 /* Output stuff that dwarf requires at the end of every file,
14415 and generate the DWARF-2 debugging info. */
14418 dwarf2out_finish (const char *filename
)
14420 limbo_die_node
*node
, *next_node
;
14421 dw_die_ref die
= 0;
14423 /* Add the name for the main input file now. We delayed this from
14424 dwarf2out_init to avoid complications with PCH. */
14425 add_name_attribute (comp_unit_die
, filename
);
14426 if (!IS_ABSOLUTE_PATH (filename
))
14427 add_comp_dir_attribute (comp_unit_die
);
14428 else if (get_AT (comp_unit_die
, DW_AT_comp_dir
) == NULL
)
14431 htab_traverse (file_table
, file_table_relative_p
, &p
);
14433 add_comp_dir_attribute (comp_unit_die
);
14436 /* Traverse the limbo die list, and add parent/child links. The only
14437 dies without parents that should be here are concrete instances of
14438 inline functions, and the comp_unit_die. We can ignore the comp_unit_die.
14439 For concrete instances, we can get the parent die from the abstract
14441 for (node
= limbo_die_list
; node
; node
= next_node
)
14443 next_node
= node
->next
;
14446 if (die
->die_parent
== NULL
)
14448 dw_die_ref origin
= get_AT_ref (die
, DW_AT_abstract_origin
);
14451 add_child_die (origin
->die_parent
, die
);
14452 else if (die
== comp_unit_die
)
14454 else if (errorcount
> 0 || sorrycount
> 0)
14455 /* It's OK to be confused by errors in the input. */
14456 add_child_die (comp_unit_die
, die
);
14459 /* In certain situations, the lexical block containing a
14460 nested function can be optimized away, which results
14461 in the nested function die being orphaned. Likewise
14462 with the return type of that nested function. Force
14463 this to be a child of the containing function.
14465 It may happen that even the containing function got fully
14466 inlined and optimized out. In that case we are lost and
14467 assign the empty child. This should not be big issue as
14468 the function is likely unreachable too. */
14469 tree context
= NULL_TREE
;
14471 gcc_assert (node
->created_for
);
14473 if (DECL_P (node
->created_for
))
14474 context
= DECL_CONTEXT (node
->created_for
);
14475 else if (TYPE_P (node
->created_for
))
14476 context
= TYPE_CONTEXT (node
->created_for
);
14478 gcc_assert (context
14479 && (TREE_CODE (context
) == FUNCTION_DECL
14480 || TREE_CODE (context
) == NAMESPACE_DECL
));
14482 origin
= lookup_decl_die (context
);
14484 add_child_die (origin
, die
);
14486 add_child_die (comp_unit_die
, die
);
14491 limbo_die_list
= NULL
;
14493 /* Walk through the list of incomplete types again, trying once more to
14494 emit full debugging info for them. */
14495 retry_incomplete_types ();
14497 if (flag_eliminate_unused_debug_types
)
14498 prune_unused_types ();
14500 /* Generate separate CUs for each of the include files we've seen.
14501 They will go into limbo_die_list. */
14502 if (flag_eliminate_dwarf2_dups
)
14503 break_out_includes (comp_unit_die
);
14505 /* Traverse the DIE's and add add sibling attributes to those DIE's
14506 that have children. */
14507 add_sibling_attributes (comp_unit_die
);
14508 for (node
= limbo_die_list
; node
; node
= node
->next
)
14509 add_sibling_attributes (node
->die
);
14511 /* Output a terminator label for the .text section. */
14512 switch_to_section (text_section
);
14513 targetm
.asm_out
.internal_label (asm_out_file
, TEXT_END_LABEL
, 0);
14514 if (flag_reorder_blocks_and_partition
)
14516 switch_to_section (unlikely_text_section ());
14517 targetm
.asm_out
.internal_label (asm_out_file
, COLD_END_LABEL
, 0);
14520 /* We can only use the low/high_pc attributes if all of the code was
14522 if (!have_multiple_function_sections
)
14524 add_AT_lbl_id (comp_unit_die
, DW_AT_low_pc
, text_section_label
);
14525 add_AT_lbl_id (comp_unit_die
, DW_AT_high_pc
, text_end_label
);
14528 /* If it wasn't, we need to give .debug_loc and .debug_ranges an appropriate
14529 "base address". Use zero so that these addresses become absolute. */
14530 else if (have_location_lists
|| ranges_table_in_use
)
14531 add_AT_addr (comp_unit_die
, DW_AT_entry_pc
, const0_rtx
);
14533 /* Output location list section if necessary. */
14534 if (have_location_lists
)
14536 /* Output the location lists info. */
14537 switch_to_section (debug_loc_section
);
14538 ASM_GENERATE_INTERNAL_LABEL (loc_section_label
,
14539 DEBUG_LOC_SECTION_LABEL
, 0);
14540 ASM_OUTPUT_LABEL (asm_out_file
, loc_section_label
);
14541 output_location_lists (die
);
14544 if (debug_info_level
>= DINFO_LEVEL_NORMAL
)
14545 add_AT_lineptr (comp_unit_die
, DW_AT_stmt_list
,
14546 debug_line_section_label
);
14548 if (debug_info_level
>= DINFO_LEVEL_VERBOSE
)
14549 add_AT_macptr (comp_unit_die
, DW_AT_macro_info
, macinfo_section_label
);
14551 /* Output all of the compilation units. We put the main one last so that
14552 the offsets are available to output_pubnames. */
14553 for (node
= limbo_die_list
; node
; node
= node
->next
)
14554 output_comp_unit (node
->die
, 0);
14556 output_comp_unit (comp_unit_die
, 0);
14558 /* Output the abbreviation table. */
14559 switch_to_section (debug_abbrev_section
);
14560 output_abbrev_section ();
14562 /* Output public names table if necessary. */
14563 if (!VEC_empty (pubname_entry
, pubname_table
))
14565 switch_to_section (debug_pubnames_section
);
14566 output_pubnames (pubname_table
);
14569 #ifdef DEBUG_PUBTYPES_SECTION
14570 /* Output public types table if necessary. */
14571 if (!VEC_empty (pubname_entry
, pubtype_table
))
14573 switch_to_section (debug_pubtypes_section
);
14574 output_pubnames (pubtype_table
);
14578 /* Output the address range information. We only put functions in the arange
14579 table, so don't write it out if we don't have any. */
14580 if (fde_table_in_use
)
14582 switch_to_section (debug_aranges_section
);
14586 /* Output ranges section if necessary. */
14587 if (ranges_table_in_use
)
14589 switch_to_section (debug_ranges_section
);
14590 ASM_OUTPUT_LABEL (asm_out_file
, ranges_section_label
);
14594 /* Output the source line correspondence table. We must do this
14595 even if there is no line information. Otherwise, on an empty
14596 translation unit, we will generate a present, but empty,
14597 .debug_info section. IRIX 6.5 `nm' will then complain when
14598 examining the file. This is done late so that any filenames
14599 used by the debug_info section are marked as 'used'. */
14600 if (! DWARF2_ASM_LINE_DEBUG_INFO
)
14602 switch_to_section (debug_line_section
);
14603 output_line_info ();
14606 /* Have to end the macro section. */
14607 if (debug_info_level
>= DINFO_LEVEL_VERBOSE
)
14609 switch_to_section (debug_macinfo_section
);
14610 dw2_asm_output_data (1, 0, "End compilation unit");
14613 /* If we emitted any DW_FORM_strp form attribute, output the string
14615 if (debug_str_hash
)
14616 htab_traverse (debug_str_hash
, output_indirect_string
, NULL
);
14620 /* This should never be used, but its address is needed for comparisons. */
14621 const struct gcc_debug_hooks dwarf2_debug_hooks
;
14623 #endif /* DWARF2_DEBUGGING_INFO */
14625 #include "gt-dwarf2out.h"