1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
73 #include "langhooks.h"
74 #include "cfglayout.h"
76 #include "hosthooks.h"
80 #include "value-prof.h"
81 #include "alloc-pool.h"
83 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
84 #include "dwarf2out.h"
87 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
91 #ifdef SDB_DEBUGGING_INFO
95 #ifdef XCOFF_DEBUGGING_INFO
96 #include "xcoffout.h" /* Needed for external data
97 declarations for e.g. AIX 4.x. */
100 #ifndef HAVE_conditional_execution
101 #define HAVE_conditional_execution 0
104 /* Carry information from ASM_DECLARE_OBJECT_NAME
105 to ASM_FINISH_DECLARE_OBJECT. */
107 extern int size_directive_output
;
108 extern tree last_assemble_variable_decl
;
110 extern void reg_alloc (void);
112 static void general_init (const char *);
113 static void do_compile (void);
114 static void process_options (void);
115 static void backend_init (void);
116 static int lang_dependent_init (const char *);
117 static void init_asm_output (const char *);
118 static void finalize (void);
120 static void crash_signal (int) ATTRIBUTE_NORETURN
;
121 static void setup_core_dumping (void);
122 static void compile_file (void);
124 static int print_single_switch (FILE *, int, int, const char *,
125 const char *, const char *,
126 const char *, const char *);
127 static void print_switch_values (FILE *, int, int, const char *,
128 const char *, const char *);
130 /* Rest of compilation helper functions. */
131 static bool rest_of_handle_inlining (tree
);
132 static void rest_of_handle_cse (tree
, rtx
);
133 static void rest_of_handle_cse2 (tree
, rtx
);
134 static void rest_of_handle_gcse (tree
, rtx
);
135 static void rest_of_handle_life (tree
, rtx
);
136 static void rest_of_handle_loop_optimize (tree
, rtx
);
137 static void rest_of_handle_loop2 (tree
, rtx
);
138 static void rest_of_handle_jump_bypass (tree
, rtx
);
139 static void rest_of_handle_sibling_calls (rtx
);
140 static void rest_of_handle_null_pointer (tree
, rtx
);
141 static void rest_of_handle_addressof (tree
, rtx
);
142 static void rest_of_handle_cfg (tree
, rtx
);
143 static void rest_of_handle_branch_prob (tree
, rtx
);
144 static void rest_of_handle_value_profile_transformations (tree
, rtx
);
145 static void rest_of_handle_if_conversion (tree
, rtx
);
146 static void rest_of_handle_if_after_combine (tree
, rtx
);
147 static void rest_of_handle_tracer (tree
, rtx
);
148 static void rest_of_handle_combine (tree
, rtx
);
149 static void rest_of_handle_regmove (tree
, rtx
);
150 #ifdef INSN_SCHEDULING
151 static void rest_of_handle_sched (tree
, rtx
);
152 static void rest_of_handle_sched2 (tree
, rtx
);
154 static bool rest_of_handle_new_regalloc (tree
, rtx
);
155 static bool rest_of_handle_old_regalloc (tree
, rtx
);
156 static void rest_of_handle_regrename (tree
, rtx
);
157 static void rest_of_handle_reorder_blocks (tree
, rtx
);
159 static void rest_of_handle_stack_regs (tree
, rtx
);
161 static void rest_of_handle_variable_tracking (tree
, rtx
);
162 static void rest_of_handle_machine_reorg (tree
, rtx
);
164 static void rest_of_handle_delay_slots (tree
, rtx
);
166 static void rest_of_handle_final (tree
, rtx
);
168 /* Nonzero to dump debug info whilst parsing (-dy option). */
169 static int set_yydebug
;
171 /* True if we don't need a backend (e.g. preprocessing only). */
172 static bool no_backend
;
174 /* Length of line when printing switch values. */
177 /* Name of program invoked, sans directories. */
179 const char *progname
;
181 /* Copy of argument vector to toplev_main. */
182 static const char **save_argv
;
184 /* Name of top-level original source file (what was input to cpp).
185 This comes from the #-command at the beginning of the actual input.
186 If there isn't any there, then this is the cc1 input file name. */
188 const char *main_input_filename
;
190 /* Current position in real source file. */
192 location_t input_location
;
194 struct line_maps line_table
;
196 /* Nonzero if it is unsafe to create any new pseudo registers. */
199 /* Stack of currently pending input files. */
201 struct file_stack
*input_file_stack
;
203 /* Incremented on each change to input_file_stack. */
204 int input_file_stack_tick
;
206 /* Name to use as base of names for dump output files. */
208 const char *dump_base_name
;
210 /* Name to use as a base for auxiliary output files. */
212 const char *aux_base_name
;
214 /* Format to use to print dumpfile index value */
215 #ifndef DUMPFILE_FORMAT
216 #define DUMPFILE_FORMAT ".%02d."
219 /* Bit flags that specify the machine subtype we are compiling for.
220 Bits are tested using macros TARGET_... defined in the tm.h file
221 and set by `-m...' switches. Must be defined in rtlanal.c. */
223 extern int target_flags
;
225 /* A mask of target_flags that includes bit X if X was set or cleared
226 on the command line. */
228 int target_flags_explicit
;
230 /* Debug hooks - dependent upon command line options. */
232 const struct gcc_debug_hooks
*debug_hooks
;
234 /* Describes a dump file. */
236 struct dump_file_info
238 /* The unique extension to apply, e.g. ".jump". */
239 const char *const extension
;
241 /* The -d<c> character that enables this dump file. */
242 char const debug_switch
;
244 /* True if there is a corresponding graph dump file. */
245 char const graph_dump_p
;
247 /* True if the user selected this dump. */
250 /* True if the files have been initialized (ie truncated). */
254 /* Enumerate the extant dump files. */
290 DFI_branch_target_load
,
299 /* Describes all the dump files. Should be kept in order of the
300 pass and in sync with dump_file_index above.
302 Remaining -d letters:
308 static struct dump_file_info dump_file
[DFI_MAX
] =
310 { "cgraph", 'U', 0, 0, 0 },
311 { "rtl", 'r', 0, 0, 0 },
312 { "sibling", 'i', 0, 0, 0 },
313 { "eh", 'h', 0, 0, 0 },
314 { "jump", 'j', 0, 0, 0 },
315 { "null", 'u', 0, 0, 0 },
316 { "cse", 's', 0, 0, 0 },
317 { "addressof", 'F', 0, 0, 0 },
318 { "gcse", 'G', 1, 0, 0 },
319 { "loop", 'L', 1, 0, 0 },
320 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
321 { "cfg", 'f', 1, 0, 0 },
322 { "bp", 'b', 1, 0, 0 },
323 { "vpt", 'V', 1, 0, 0 },
324 { "ce1", 'C', 1, 0, 0 },
325 { "tracer", 'T', 1, 0, 0 },
326 { "loop2", 'L', 1, 0, 0 },
327 { "web", 'Z', 0, 0, 0 },
328 { "cse2", 't', 1, 0, 0 },
329 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
330 { "combine", 'c', 1, 0, 0 },
331 { "ce2", 'C', 1, 0, 0 },
332 { "regmove", 'N', 1, 0, 0 },
333 { "sched", 'S', 1, 0, 0 },
334 { "lreg", 'l', 1, 0, 0 },
335 { "greg", 'g', 1, 0, 0 },
336 { "postreload", 'o', 1, 0, 0 },
337 { "flow2", 'w', 1, 0, 0 },
338 { "peephole2", 'z', 1, 0, 0 },
339 { "rnreg", 'n', 1, 0, 0 },
340 { "ce3", 'E', 1, 0, 0 },
341 { "bbro", 'B', 1, 0, 0 },
342 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
343 { "sched2", 'R', 1, 0, 0 },
344 { "stack", 'k', 1, 0, 0 },
345 { "vartrack", 'V', 1, 0, 0 }, /* Yes, duplicate enable switch. */
346 { "mach", 'M', 1, 0, 0 },
347 { "dbr", 'd', 0, 0, 0 },
350 static int open_dump_file (enum dump_file_index
, tree
);
351 static void close_dump_file (enum dump_file_index
,
352 void (*) (FILE *, rtx
), rtx
);
354 /* Other flags saying which kinds of debugging dump have been requested. */
356 int rtl_dump_and_exit
;
357 int flag_print_asm_name
;
358 enum graph_dump_types graph_dump_format
;
360 /* Name for output file of assembly code, specified with -o. */
362 const char *asm_file_name
;
364 /* Nonzero means do optimizations. -O.
365 Particular numeric values stand for particular amounts of optimization;
366 thus, -O2 stores 2 here. However, the optimizations beyond the basic
367 ones are not controlled directly by this variable. Instead, they are
368 controlled by individual `flag_...' variables that are defaulted
369 based on this variable. */
373 /* Nonzero means optimize for size. -Os.
374 The only valid values are zero and nonzero. When optimize_size is
375 nonzero, optimize defaults to 2, but certain individual code
376 bloating optimizations are disabled. */
378 int optimize_size
= 0;
380 /* The FUNCTION_DECL for the function currently being compiled,
381 or 0 if between functions. */
382 tree current_function_decl
;
384 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
386 tree current_function_func_begin_label
;
388 /* Nonzero if doing dwarf2 duplicate elimination. */
390 int flag_eliminate_dwarf2_dups
= 0;
392 /* Nonzero if doing unused type elimination. */
394 int flag_eliminate_unused_debug_types
= 1;
396 /* Nonzero means emit debugging information only for symbols which are used. */
397 int flag_debug_only_used_symbols
= 0;
399 /* Nonzero if generating code to do profiling. */
401 int profile_flag
= 0;
403 /* Nonzero if generating code to profile program flow graph arcs. */
405 int profile_arc_flag
= 0;
407 /* Nonzero if value histograms should be measured. */
409 int flag_profile_values
= 0;
411 /* Nonzero if value histograms should be used to optimize code. */
412 int flag_value_profile_transformations
= 0;
414 /* Nonzero if generating info for gcov to calculate line test coverage. */
416 int flag_test_coverage
= 0;
418 /* Nonzero indicates that branch taken probabilities should be calculated. */
420 int flag_branch_probabilities
= 0;
422 /* Nonzero if basic blocks should be reordered. */
424 int flag_reorder_blocks
= 0;
426 /* Nonzero if functions should be reordered. */
428 int flag_reorder_functions
= 0;
430 /* Nonzero if registers should be renamed. */
432 int flag_rename_registers
= 0;
433 int flag_cprop_registers
= 0;
435 /* Nonzero for -pedantic switch: warn about anything
436 that standard spec forbids. */
440 /* Temporarily suppress certain warnings.
441 This is set while reading code from a system header file. */
443 int in_system_header
= 0;
445 /* Don't print functions as they are compiled. -quiet. */
449 /* Print times taken by the various passes. -ftime-report. */
453 /* Print memory still in use at end of compilation (which may have little
454 to do with peak memory consumption). -fmem-report. */
458 /* Nonzero means to collect statistics which might be expensive
459 and to print them when we are done. */
460 int flag_detailed_statistics
= 0;
462 /* A random sequence of characters, unless overridden by user. */
463 const char *flag_random_seed
;
465 /* A local time stamp derived from the time of compilation. It will be
466 zero if the system cannot provide a time. It will be -1u, if the
467 user has specified a particular random seed. */
472 /* Nonzero means `char' should be signed. */
474 int flag_signed_char
;
476 /* Nonzero means give an enum type only as many bytes as it needs. */
478 int flag_short_enums
;
480 /* Nonzero for -fcaller-saves: allocate values in regs that need to
481 be saved across function calls, if that produces overall better code.
482 Optional now, so people can test it. */
484 int flag_caller_saves
= 0;
486 /* Nonzero if structures and unions should be returned in memory.
488 This should only be defined if compatibility with another compiler or
489 with an ABI is needed, because it results in slower code. */
491 #ifndef DEFAULT_PCC_STRUCT_RETURN
492 #define DEFAULT_PCC_STRUCT_RETURN 1
495 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
497 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
499 /* Nonzero for -fforce-mem: load memory value into a register
500 before arithmetic on it. This makes better cse but slower compilation. */
502 int flag_force_mem
= 0;
504 /* Nonzero for -fforce-addr: load memory address into a register before
505 reference to memory. This makes better cse but slower compilation. */
507 int flag_force_addr
= 0;
509 /* Nonzero for -fdefer-pop: don't pop args after each function call;
510 instead save them up to pop many calls' args with one insns. */
512 int flag_defer_pop
= 0;
514 /* Nonzero for -ffloat-store: don't allocate floats and doubles
515 in extended-precision registers. */
517 int flag_float_store
= 0;
519 /* Nonzero for -fcse-follow-jumps:
520 have cse follow jumps to do a more extensive job. */
522 int flag_cse_follow_jumps
;
524 /* Nonzero for -fcse-skip-blocks:
525 have cse follow a branch around a block. */
526 int flag_cse_skip_blocks
;
528 /* Nonzero for -fexpensive-optimizations:
529 perform miscellaneous relatively-expensive optimizations. */
530 int flag_expensive_optimizations
;
532 /* Nonzero for -fthread-jumps:
533 have jump optimize output of loop. */
535 int flag_thread_jumps
;
537 /* Nonzero enables strength-reduction in loop.c. */
539 int flag_strength_reduce
= 0;
541 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
542 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
543 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
546 int flag_old_unroll_loops
;
548 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
549 This is generally not a win. */
551 int flag_old_unroll_all_loops
;
553 /* Enables unrolling of simple loops in loop-unroll.c. */
554 int flag_unroll_loops
;
556 /* Enables unrolling of all loops in loop-unroll.c. */
557 int flag_unroll_all_loops
;
559 /* Nonzero enables loop peeling. */
562 /* Nonzero enables loop unswitching. */
563 int flag_unswitch_loops
;
565 /* Nonzero enables prefetch optimizations for arrays in loops. */
567 int flag_prefetch_loop_arrays
;
569 /* Nonzero forces all invariant computations in loops to be moved
572 int flag_move_all_movables
= 0;
574 /* Nonzero forces all general induction variables in loops to be
577 int flag_reduce_all_givs
= 0;
579 /* Nonzero to perform full register move optimization passes. This is the
582 int flag_regmove
= 0;
584 /* Nonzero for -fwritable-strings:
585 store string constants in data segment and don't uniquize them. */
587 int flag_writable_strings
= 0;
589 /* Nonzero means don't put addresses of constant functions in registers.
590 Used for compiling the Unix kernel, where strange substitutions are
591 done on the assembly output. */
593 int flag_no_function_cse
= 0;
595 /* Nonzero for -fomit-frame-pointer:
596 don't make a frame pointer in simple functions that don't require one. */
598 int flag_omit_frame_pointer
= 0;
600 /* Nonzero means place each function into its own section on those platforms
601 which support arbitrary section names and unlimited numbers of sections. */
603 int flag_function_sections
= 0;
605 /* ... and similar for data. */
607 int flag_data_sections
= 0;
609 /* Nonzero to inhibit use of define_optimization peephole opts. */
611 int flag_no_peephole
= 0;
613 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
615 int flag_optimize_sibling_calls
= 0;
617 /* Nonzero means the front end generally wants `errno' maintained by math
618 operations, like built-in SQRT. */
620 int flag_errno_math
= 1;
622 /* Nonzero means that unsafe floating-point math optimizations are allowed
623 for the sake of speed. IEEE compliance is not guaranteed, and operations
624 are allowed to assume that their arguments and results are "normal"
625 (e.g., nonnegative for SQRT). */
627 int flag_unsafe_math_optimizations
= 0;
629 /* Nonzero means that no NaNs or +-Infs are expected. */
631 int flag_finite_math_only
= 0;
633 /* Zero means that floating-point math operations cannot generate a
634 (user-visible) trap. This is the case, for example, in nonstop
635 IEEE 754 arithmetic. Trapping conditions include division by zero,
636 overflow, underflow, invalid and inexact, but does not include
637 operations on signaling NaNs (see below). */
639 int flag_trapping_math
= 1;
641 /* Nonzero means disable transformations that assume default floating
642 point rounding behavior. */
644 int flag_rounding_math
= 0;
646 /* Nonzero means disable transformations observable by signaling NaNs.
647 This option implies that any operation on an IEEE signaling NaN can
648 generate a (user-visible) trap. */
650 int flag_signaling_nans
= 0;
652 /* 0 means straightforward implementation of complex divide acceptable.
653 1 means wide ranges of inputs must work for complex divide.
654 2 means C99-like requirements for complex divide (not yet implemented). */
656 int flag_complex_divide_method
= 0;
658 /* Nonzero means just do syntax checking; don't output anything. */
660 int flag_syntax_only
= 0;
662 /* Nonzero means performs web construction pass. */
666 /* Nonzero means perform loop optimizer. */
668 int flag_loop_optimize
;
670 /* Nonzero means perform crossjumping. */
672 int flag_crossjumping
;
674 /* Nonzero means perform if conversion. */
676 int flag_if_conversion
;
678 /* Nonzero means perform if conversion after reload. */
680 int flag_if_conversion2
;
682 /* Nonzero means to use global dataflow analysis to eliminate
683 useless null pointer tests. */
685 int flag_delete_null_pointer_checks
;
687 /* Nonzero means perform global CSE. */
691 /* Nonzero means to do the enhanced load motion during gcse, which trys
692 to hoist loads by not killing them when a store to the same location
695 int flag_gcse_lm
= 1;
697 /* Nonzero means to perform store motion after gcse, which will try to
698 move stores closer to the exit block. Its not very effective without
701 int flag_gcse_sm
= 1;
703 /* Nonzero if we want to perfrom redundant load after store elimination
706 int flag_gcse_las
= 1;
708 /* Perform target register optimization before prologue / epilogue
711 int flag_branch_target_load_optimize
= 0;
713 /* Perform target register optimization after prologue / epilogue
714 threading and jump2. */
716 int flag_branch_target_load_optimize2
= 0;
718 /* For the bt-load pass, nonzero means don't re-use branch target registers
719 in any basic block. */
721 int flag_btr_bb_exclusive
;
723 /* Nonzero means to rerun cse after loop optimization. This increases
724 compilation time about 20% and picks up a few more common expressions. */
726 int flag_rerun_cse_after_loop
;
728 /* Nonzero means to run loop optimizations twice. */
730 int flag_rerun_loop_opt
;
732 /* Nonzero for -finline-functions: ok to inline functions that look like
733 good inline candidates. */
735 int flag_inline_functions
;
737 /* Nonzero for -fkeep-inline-functions: even if we make a function
738 go inline everywhere, keep its definition around for debugging
741 int flag_keep_inline_functions
;
743 /* Nonzero means that functions will not be inlined. */
745 int flag_no_inline
= 2;
747 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
748 not just because the tree inliner turned us off. */
750 int flag_really_no_inline
= 2;
752 /* Nonzero means that we should emit static const variables
753 regardless of whether or not optimization is turned on. */
755 int flag_keep_static_consts
= 1;
757 /* Nonzero means we should be saving declaration info into a .X file. */
759 int flag_gen_aux_info
= 0;
761 /* Specified name of aux-info file. */
763 const char *aux_info_file_name
;
765 /* Nonzero means make the text shared if supported. */
767 int flag_shared_data
;
769 /* Nonzero means schedule into delayed branch slots if supported. */
771 int flag_delayed_branch
;
773 /* Nonzero if we are compiling pure (sharable) code.
774 Value is 1 if we are doing "small" pic; value is 2 if we're doing
779 /* Nonzero if we are compiling position independent code for executable.
780 The value is 1 if we are doing "small" pic; value is 2 if we're doing
785 /* Nonzero if we are compiling code for a shared library, zero for
790 /* Set to the default thread-local storage (tls) model to use. */
792 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
794 /* Nonzero means generate extra code for exception handling and enable
795 exception handling. */
799 /* Nonzero means generate frame unwind info table when supported. */
801 int flag_unwind_tables
= 0;
803 /* Nonzero means generate frame unwind info table exact at each insn
806 int flag_asynchronous_unwind_tables
= 0;
808 /* Nonzero means don't place uninitialized global data in common storage
813 /* Nonzero means change certain warnings into errors.
814 Usually these are warnings about failure to conform to some standard. */
816 int flag_pedantic_errors
= 0;
818 /* flag_schedule_insns means schedule insns within basic blocks (before
820 flag_schedule_insns_after_reload means schedule insns after
823 int flag_schedule_insns
= 0;
824 int flag_schedule_insns_after_reload
= 0;
826 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
827 int flag_sched2_use_superblocks
= 0;
829 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
831 int flag_sched2_use_traces
= 0;
833 /* The following flags have effect only for scheduling before register
836 flag_schedule_interblock means schedule insns across basic blocks.
837 flag_schedule_speculative means allow speculative motion of non-load insns.
838 flag_schedule_speculative_load means allow speculative motion of some
840 flag_schedule_speculative_load_dangerous allows speculative motion of more
843 int flag_schedule_interblock
= 1;
844 int flag_schedule_speculative
= 1;
845 int flag_schedule_speculative_load
= 0;
846 int flag_schedule_speculative_load_dangerous
= 0;
848 /* The following flags have an effect during scheduling after register
851 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
852 of stalled insns into the ready list.
854 flag_sched_stalled_insns_dep controls how many insn groups will be examined
855 for a dependency on a stalled insn that is candidate for premature removal
856 from the queue of stalled insns into the ready list (has an effect only if
857 the flag 'sched_stalled_insns' is set). */
859 int flag_sched_stalled_insns
= 0;
860 int flag_sched_stalled_insns_dep
= 1;
862 int flag_single_precision_constant
;
864 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
865 by a cheaper branch on a count register. */
866 int flag_branch_on_count_reg
= 1;
868 /* -finhibit-size-directive inhibits output of .size for ELF.
869 This is used only for compiling crtstuff.c,
870 and it may be extended to other effects
871 needed for crtstuff.c on other systems. */
872 int flag_inhibit_size_directive
= 0;
874 /* -fverbose-asm causes extra commentary information to be produced in
875 the generated assembly code (to make it more readable). This option
876 is generally only of use to those who actually need to read the
877 generated assembly code (perhaps while debugging the compiler itself).
878 -fno-verbose-asm, the default, causes the extra information
879 to be omitted and is useful when comparing two assembler files. */
881 int flag_verbose_asm
= 0;
883 /* -dA causes debug commentary information to be produced in
884 the generated assembly code (to make it more readable). This option
885 is generally only of use to those who actually need to read the
886 generated assembly code (perhaps while debugging the compiler itself).
887 Currently, this switch is only used by dwarfout.c; however, it is intended
888 to be a catchall for printing debug information in the assembler file. */
890 int flag_debug_asm
= 0;
892 /* -dP causes the rtl to be emitted as a comment in assembly. */
894 int flag_dump_rtl_in_asm
= 0;
896 /* Nonzero means put zero initialized data in the bss section. */
897 int flag_zero_initialized_in_bss
= 1;
899 /* Tag all structures with __attribute__(packed). */
900 int flag_pack_struct
= 0;
902 /* Emit code to check for stack overflow; also may cause large objects
903 to be allocated dynamically. */
904 int flag_stack_check
;
906 /* When non-NULL, indicates that whenever space is allocated on the
907 stack, the resulting stack pointer must not pass this
908 address---that is, for stacks that grow downward, the stack pointer
909 must always be greater than or equal to this address; for stacks
910 that grow upward, the stack pointer must be less than this address.
911 At present, the rtx may be either a REG or a SYMBOL_REF, although
912 the support provided depends on the backend. */
915 /* 0 if pointer arguments may alias each other. True in C.
916 1 if pointer arguments may not alias each other but may alias
918 2 if pointer arguments may not alias each other and may not
919 alias global variables. True in Fortran.
920 This defaults to 0 for C. */
921 int flag_argument_noalias
= 0;
923 /* Nonzero if we should do (language-dependent) alias analysis.
924 Typically, this analysis will assume that expressions of certain
925 types do not alias expressions of certain other types. Only used
926 if alias analysis (in general) is enabled. */
927 int flag_strict_aliasing
= 0;
929 /* Instrument functions with calls at entry and exit, for profiling. */
930 int flag_instrument_function_entry_exit
= 0;
932 /* Nonzero means ignore `#ident' directives. 0 means handle them.
933 On SVR4 targets, it also controls whether or not to emit a
934 string identifying the compiler. */
936 int flag_no_ident
= 0;
938 /* This will perform a peephole pass before sched2. */
939 int flag_peephole2
= 0;
941 /* This will try to guess branch probabilities. */
942 int flag_guess_branch_prob
= 0;
944 /* -fcheck-bounds causes gcc to generate array bounds checks.
945 For C, C++, ObjC: defaults to off.
946 For Java: defaults to on.
947 For Fortran: defaults to off. */
948 int flag_bounds_check
= 0;
950 /* This will attempt to merge constant section constants, if 1 only
951 string constants and constants from constant pool, if 2 also constant
953 int flag_merge_constants
= 1;
955 /* If one, renumber instruction UIDs to reduce the number of
956 unused UIDs if there are a lot of instructions. If greater than
957 one, unconditionally renumber instruction UIDs. */
958 int flag_renumber_insns
= 1;
960 /* If nonzero, use the graph coloring register allocator. */
961 int flag_new_regalloc
= 0;
963 /* Nonzero if we perform superblock formation. */
967 /* Nonzero if we perform whole unit at a time compilation. */
969 int flag_unit_at_a_time
= 0;
971 /* Nonzero if we should track variables. When
972 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
973 to optimize, debug_info_level and debug_hooks in process_options (). */
975 #define AUTODETECT_FLAG_VAR_TRACKING 2
976 int flag_var_tracking
= AUTODETECT_FLAG_VAR_TRACKING
;
978 /* Values of the -falign-* flags: how much to align labels in code.
979 0 means `use default', 1 means `don't align'.
980 For each variable, there is an _log variant which is the power
981 of two not less than the variable, for .align output. */
985 int align_loops_max_skip
;
988 int align_jumps_max_skip
;
990 int align_labels_log
;
991 int align_labels_max_skip
;
993 int align_functions_log
;
995 /* Like align_functions_log above, but used by front-ends to force the
996 minimum function alignment. Zero means no alignment is forced. */
997 int force_align_functions_log
;
1001 const char *const string
;
1002 int *const variable
;
1005 lang_independent_options
;
1007 /* Nonzero if signed arithmetic overflow should trap. */
1010 /* Nonzero if signed arithmetic overflow should wrap around. */
1013 /* Nonzero if subexpressions must be evaluated from left-to-right. */
1014 int flag_evaluation_order
= 0;
1016 /* Add or remove a leading underscore from user symbols. */
1017 int flag_leading_underscore
= -1;
1019 /* The user symbol prefix after having resolved same. */
1020 const char *user_label_prefix
;
1022 static const param_info lang_independent_params
[] = {
1023 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1024 { OPTION, DEFAULT, HELP },
1025 #include "params.def"
1030 /* Table of language-independent -f options.
1031 STRING is the option name. VARIABLE is the address of the variable.
1032 ON_VALUE is the value to store in VARIABLE
1033 if `-fSTRING' is seen as an option.
1034 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1036 static const lang_independent_options f_options
[] =
1038 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1 },
1039 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols
, 1 },
1040 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types
, 1 },
1041 {"float-store", &flag_float_store
, 1 },
1042 {"defer-pop", &flag_defer_pop
, 1 },
1043 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1 },
1044 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1 },
1045 {"tracer", &flag_tracer
, 1 },
1046 {"unit-at-a-time", &flag_unit_at_a_time
, 1 },
1047 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1 },
1048 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1 },
1049 {"expensive-optimizations", &flag_expensive_optimizations
, 1 },
1050 {"thread-jumps", &flag_thread_jumps
, 1 },
1051 {"strength-reduce", &flag_strength_reduce
, 1 },
1052 {"unroll-loops", &flag_unroll_loops
, 1 },
1053 {"unroll-all-loops", &flag_unroll_all_loops
, 1 },
1054 {"old-unroll-loops", &flag_old_unroll_loops
, 1 },
1055 {"old-unroll-all-loops", &flag_old_unroll_all_loops
, 1 },
1056 {"peel-loops", &flag_peel_loops
, 1 },
1057 {"unswitch-loops", &flag_unswitch_loops
, 1 },
1058 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1 },
1059 {"move-all-movables", &flag_move_all_movables
, 1 },
1060 {"reduce-all-givs", &flag_reduce_all_givs
, 1 },
1061 {"writable-strings", &flag_writable_strings
, 1 },
1062 {"peephole", &flag_no_peephole
, 0 },
1063 {"force-mem", &flag_force_mem
, 1 },
1064 {"force-addr", &flag_force_addr
, 1 },
1065 {"function-cse", &flag_no_function_cse
, 0 },
1066 {"inline-functions", &flag_inline_functions
, 1 },
1067 {"keep-inline-functions", &flag_keep_inline_functions
, 1 },
1068 {"inline", &flag_no_inline
, 0 },
1069 {"keep-static-consts", &flag_keep_static_consts
, 1 },
1070 {"syntax-only", &flag_syntax_only
, 1 },
1071 {"shared-data", &flag_shared_data
, 1 },
1072 {"caller-saves", &flag_caller_saves
, 1 },
1073 {"pcc-struct-return", &flag_pcc_struct_return
, 1 },
1074 {"reg-struct-return", &flag_pcc_struct_return
, 0 },
1075 {"delayed-branch", &flag_delayed_branch
, 1 },
1076 {"web", &flag_web
, 1},
1077 {"gcse", &flag_gcse
, 1 },
1078 {"gcse-lm", &flag_gcse_lm
, 1 },
1079 {"gcse-sm", &flag_gcse_sm
, 1 },
1080 {"gcse-las", &flag_gcse_las
, 1 },
1081 {"branch-target-load-optimize", &flag_branch_target_load_optimize
, 1 },
1082 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2
, 1 },
1083 {"btr-bb-exclusive", &flag_btr_bb_exclusive
, 1 },
1084 {"loop-optimize", &flag_loop_optimize
, 1 },
1085 {"crossjumping", &flag_crossjumping
, 1 },
1086 {"if-conversion", &flag_if_conversion
, 1 },
1087 {"if-conversion2", &flag_if_conversion2
, 1 },
1088 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1 },
1089 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1 },
1090 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1 },
1091 {"schedule-insns", &flag_schedule_insns
, 1 },
1092 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1 },
1093 {"sched-interblock",&flag_schedule_interblock
, 1 },
1094 {"sched-spec",&flag_schedule_speculative
, 1 },
1095 {"sched-spec-load",&flag_schedule_speculative_load
, 1 },
1096 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1 },
1097 {"sched-stalled-insns", &flag_sched_stalled_insns
, 0 },
1098 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep
, 1 },
1099 {"sched2-use-superblocks", &flag_sched2_use_superblocks
, 1 },
1100 {"sched2-use-traces", &flag_sched2_use_traces
, 1 },
1101 {"branch-count-reg",&flag_branch_on_count_reg
, 1 },
1102 {"pic", &flag_pic
, 1 },
1103 {"PIC", &flag_pic
, 2 },
1104 {"pie", &flag_pie
, 1 },
1105 {"PIE", &flag_pie
, 2 },
1106 {"exceptions", &flag_exceptions
, 1 },
1107 {"unwind-tables", &flag_unwind_tables
, 1 },
1108 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1 },
1109 {"non-call-exceptions", &flag_non_call_exceptions
, 1 },
1110 {"profile-arcs", &profile_arc_flag
, 1 },
1111 {"profile-values", &flag_profile_values
, 1 },
1112 {"vpt", &flag_value_profile_transformations
, 1 },
1113 {"test-coverage", &flag_test_coverage
, 1 },
1114 {"branch-probabilities", &flag_branch_probabilities
, 1 },
1115 {"profile", &profile_flag
, 1 },
1116 {"reorder-blocks", &flag_reorder_blocks
, 1 },
1117 {"reorder-functions", &flag_reorder_functions
, 1 },
1118 {"rename-registers", &flag_rename_registers
, 1 },
1119 {"cprop-registers", &flag_cprop_registers
, 1 },
1120 {"common", &flag_no_common
, 0 },
1121 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1 },
1122 {"function-sections", &flag_function_sections
, 1 },
1123 {"data-sections", &flag_data_sections
, 1 },
1124 {"verbose-asm", &flag_verbose_asm
, 1 },
1125 {"regmove", &flag_regmove
, 1 },
1126 {"optimize-register-move", &flag_regmove
, 1 },
1127 {"pack-struct", &flag_pack_struct
, 1 },
1128 {"stack-check", &flag_stack_check
, 1 },
1129 {"argument-alias", &flag_argument_noalias
, 0 },
1130 {"argument-noalias", &flag_argument_noalias
, 1 },
1131 {"argument-noalias-global", &flag_argument_noalias
, 2 },
1132 {"strict-aliasing", &flag_strict_aliasing
, 1 },
1133 {"align-loops", &align_loops
, 0 },
1134 {"align-jumps", &align_jumps
, 0 },
1135 {"align-labels", &align_labels
, 0 },
1136 {"align-functions", &align_functions
, 0 },
1137 {"merge-constants", &flag_merge_constants
, 1 },
1138 {"merge-all-constants", &flag_merge_constants
, 2 },
1139 {"dump-unnumbered", &flag_dump_unnumbered
, 1 },
1140 {"instrument-functions", &flag_instrument_function_entry_exit
, 1 },
1141 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1 },
1142 {"leading-underscore", &flag_leading_underscore
, 1 },
1143 {"ident", &flag_no_ident
, 0 },
1144 { "peephole2", &flag_peephole2
, 1 },
1145 {"finite-math-only", &flag_finite_math_only
, 1 },
1146 { "guess-branch-probability", &flag_guess_branch_prob
, 1 },
1147 {"math-errno", &flag_errno_math
, 1 },
1148 {"trapping-math", &flag_trapping_math
, 1 },
1149 {"rounding-math", &flag_rounding_math
, 1 },
1150 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1 },
1151 {"signaling-nans", &flag_signaling_nans
, 1 },
1152 {"bounds-check", &flag_bounds_check
, 1 },
1153 {"single-precision-constant", &flag_single_precision_constant
, 1 },
1154 {"time-report", &time_report
, 1 },
1155 {"mem-report", &mem_report
, 1 },
1156 { "trapv", &flag_trapv
, 1 },
1157 { "wrapv", &flag_wrapv
, 1 },
1158 { "new-ra", &flag_new_regalloc
, 1 },
1159 { "var-tracking", &flag_var_tracking
, 1}
1162 /* Here is a table, controlled by the tm.h file, listing each -m switch
1163 and which bits in `target_switches' it should set or clear.
1164 If VALUE is positive, it is bits to set.
1165 If VALUE is negative, -VALUE is bits to clear.
1166 (The sign bit is not used so there is no confusion.) */
1170 const char *const name
;
1172 const char *const description
;
1174 target_switches
[] = TARGET_SWITCHES
;
1176 /* This table is similar, but allows the switch to have a value. */
1178 #ifdef TARGET_OPTIONS
1181 const char *const prefix
;
1182 const char **const variable
;
1183 const char *const description
;
1184 const char *const value
;
1186 target_options
[] = TARGET_OPTIONS
;
1189 /* Nonzero means warn about function definitions that default the return type
1190 or that use a null return and have a return-type other than void. */
1192 int warn_return_type
;
1194 /* Output files for assembler code (real compiler output)
1195 and debugging dumps. */
1198 FILE *aux_info_file
;
1199 FILE *rtl_dump_file
= NULL
;
1200 FILE *cgraph_dump_file
= NULL
;
1202 /* The current working directory of a translation. It's generally the
1203 directory from which compilation was initiated, but a preprocessed
1204 file may specify the original directory in which it was
1207 static const char *src_pwd
;
1209 /* Initialize src_pwd with the given string, and return true. If it
1210 was already initialized, return false. As a special case, it may
1211 be called with a NULL argument to test whether src_pwd has NOT been
1215 set_src_pwd (const char *pwd
)
1220 src_pwd
= xstrdup (pwd
);
1224 /* Return the directory from which the translation unit was initiated,
1225 in case set_src_pwd() was not called before to assign it a
1232 src_pwd
= getpwd ();
1237 /* Called when the start of a function definition is parsed,
1238 this function prints on stderr the name of the function. */
1240 announce_function (tree decl
)
1244 if (rtl_dump_and_exit
)
1245 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl
)));
1247 verbatim (" %s", (*lang_hooks
.decl_printable_name
) (decl
, 2));
1249 pp_needs_newline (global_dc
->printer
) = true;
1250 diagnostic_set_last_function (global_dc
);
1254 /* Set up a default flag_random_seed and local_tick, unless the user
1255 already specified one. */
1260 if (!flag_random_seed
)
1262 unsigned HOST_WIDE_INT value
;
1263 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
1265 /* Get some more or less random data. */
1266 #ifdef HAVE_GETTIMEOFDAY
1270 gettimeofday (&tv
, NULL
);
1271 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
1275 time_t now
= time (NULL
);
1277 if (now
!= (time_t)-1)
1278 local_tick
= (unsigned) now
;
1281 value
= local_tick
^ getpid ();
1283 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
1284 flag_random_seed
= random_seed
;
1286 else if (!local_tick
)
1291 /* Decode the string P as an integral parameter.
1292 If the string is indeed an integer return its numeric value else
1293 issue an Invalid Option error for the option PNAME and return DEFVAL.
1294 If PNAME is zero just return DEFVAL, do not call error. */
1297 read_integral_parameter (const char *p
, const char *pname
, const int defval
)
1299 const char *endp
= p
;
1303 if (ISDIGIT (*endp
))
1312 error ("invalid option argument `%s'", pname
);
1319 /* Return the logarithm of X, base 2, considering X unsigned,
1320 if X is a power of 2. Otherwise, returns -1.
1322 This should be used via the `exact_log2' macro. */
1325 exact_log2_wide (unsigned HOST_WIDE_INT x
)
1328 /* Test for 0 or a power of 2. */
1329 if (x
== 0 || x
!= (x
& -x
))
1331 while ((x
>>= 1) != 0)
1336 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1337 If X is 0, return -1.
1339 This should be used via the floor_log2 macro. */
1342 floor_log2_wide (unsigned HOST_WIDE_INT x
)
1351 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1352 into ICE messages, which is much more user friendly. In case the
1353 error printer crashes, reset the signal to prevent infinite recursion. */
1356 crash_signal (int signo
)
1358 signal (signo
, SIG_DFL
);
1359 internal_error ("%s", strsignal (signo
));
1362 /* Arrange to dump core on error. (The regular error message is still
1363 printed first, except in the case of abort().) */
1366 setup_core_dumping (void)
1369 signal (SIGABRT
, SIG_DFL
);
1371 #if defined(HAVE_SETRLIMIT)
1374 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
1375 fatal_error ("getting core file size maximum limit: %m");
1376 rlim
.rlim_cur
= rlim
.rlim_max
;
1377 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
1378 fatal_error ("setting core file size limit to maximum: %m");
1381 diagnostic_abort_on_error (global_dc
);
1385 /* Strip off a legitimate source ending from the input string NAME of
1386 length LEN. Rather than having to know the names used by all of
1387 our front ends, we strip off an ending of a period followed by
1388 up to five characters. (Java uses ".class".) */
1391 strip_off_ending (char *name
, int len
)
1394 for (i
= 2; i
< 6 && len
> i
; i
++)
1396 if (name
[len
- i
] == '.')
1398 name
[len
- i
] = '\0';
1404 /* Output a quoted string. */
1407 output_quoted_string (FILE *asm_file
, const char *string
)
1409 #ifdef OUTPUT_QUOTED_STRING
1410 OUTPUT_QUOTED_STRING (asm_file
, string
);
1414 putc ('\"', asm_file
);
1415 while ((c
= *string
++) != 0)
1419 if (c
== '\"' || c
== '\\')
1420 putc ('\\', asm_file
);
1424 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1426 putc ('\"', asm_file
);
1430 /* Output a file name in the form wanted by System V. */
1433 output_file_directive (FILE *asm_file
, const char *input_name
)
1438 if (input_name
== NULL
)
1439 input_name
= "<stdin>";
1441 len
= strlen (input_name
);
1442 na
= input_name
+ len
;
1444 /* NA gets INPUT_NAME sans directory names. */
1445 while (na
> input_name
)
1447 if (IS_DIR_SEPARATOR (na
[-1]))
1452 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1453 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1455 fprintf (asm_file
, "\t.file\t");
1456 output_quoted_string (asm_file
, na
);
1457 fputc ('\n', asm_file
);
1461 /* Routine to open a dump file. Return true if the dump file is enabled. */
1464 open_dump_file (enum dump_file_index index
, tree decl
)
1467 const char *open_arg
;
1470 if (! dump_file
[index
].enabled
)
1473 timevar_push (TV_DUMP
);
1474 if (rtl_dump_file
!= NULL
)
1475 fclose (rtl_dump_file
);
1477 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1479 if (! dump_file
[index
].initialized
)
1481 /* If we've not initialized the files, do so now. */
1482 if (graph_dump_format
!= no_graph
1483 && dump_file
[index
].graph_dump_p
)
1485 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1486 clean_graph_dump_file (dump_base_name
, dump_name
);
1489 dump_file
[index
].initialized
= 1;
1495 dump_name
= concat (dump_base_name
, seq
,
1496 dump_file
[index
].extension
, NULL
);
1498 rtl_dump_file
= fopen (dump_name
, open_arg
);
1499 if (rtl_dump_file
== NULL
)
1500 fatal_error ("can't open %s: %m", dump_name
);
1505 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1506 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1507 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1509 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1510 ? " (unlikely executed)"
1513 timevar_pop (TV_DUMP
);
1517 /* Routine to close a dump file. */
1520 close_dump_file (enum dump_file_index index
,
1521 void (*func
) (FILE *, rtx
),
1524 if (! rtl_dump_file
)
1527 timevar_push (TV_DUMP
);
1529 && graph_dump_format
!= no_graph
1530 && dump_file
[index
].graph_dump_p
)
1535 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1536 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1537 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1542 func (rtl_dump_file
, insns
);
1544 fflush (rtl_dump_file
);
1545 fclose (rtl_dump_file
);
1547 rtl_dump_file
= NULL
;
1548 timevar_pop (TV_DUMP
);
1551 /* Do any final processing required for the declarations in VEC, of
1552 which there are LEN. We write out inline functions and variables
1553 that have been deferred until this point, but which are required.
1554 Returns nonzero if anything was put out. */
1557 wrapup_global_declarations (tree
*vec
, int len
)
1562 int output_something
= 0;
1564 for (i
= 0; i
< len
; i
++)
1568 /* We're not deferring this any longer. Assignment is
1569 conditional to avoid needlessly dirtying PCH pages. */
1570 if (DECL_DEFER_OUTPUT (decl
) != 0)
1571 DECL_DEFER_OUTPUT (decl
) = 0;
1573 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1574 (*lang_hooks
.finish_incomplete_decl
) (decl
);
1577 /* Now emit any global variables or functions that we have been
1578 putting off. We need to loop in case one of the things emitted
1579 here references another one which comes earlier in the list. */
1583 for (i
= 0; i
< len
; i
++)
1587 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1590 /* Don't write out static consts, unless we still need them.
1592 We also keep static consts if not optimizing (for debugging),
1593 unless the user specified -fno-keep-static-consts.
1594 ??? They might be better written into the debug information.
1595 This is possible when using DWARF.
1597 A language processor that wants static constants to be always
1598 written out (even if it is not used) is responsible for
1599 calling rest_of_decl_compilation itself. E.g. the C front-end
1600 calls rest_of_decl_compilation from finish_decl.
1601 One motivation for this is that is conventional in some
1602 environments to write things like:
1603 static const char rcsid[] = "... version string ...";
1604 intending to force the string to be in the executable.
1606 A language processor that would prefer to have unneeded
1607 static constants "optimized away" would just defer writing
1608 them out until here. E.g. C++ does this, because static
1609 constants are often defined in header files.
1611 ??? A tempting alternative (for both C and C++) would be
1612 to force a constant to be written if and only if it is
1613 defined in a main file, as opposed to an include file. */
1615 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1619 if (flag_unit_at_a_time
1620 && cgraph_varpool_node (decl
)->finalized
)
1622 else if ((flag_unit_at_a_time
&& !cgraph_global_info_ready
)
1623 && (TREE_USED (decl
)
1624 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
1626 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1628 else if (DECL_COMDAT (decl
))
1630 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1631 && (optimize
|| !flag_keep_static_consts
1632 || DECL_ARTIFICIAL (decl
)))
1638 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1642 if (TREE_CODE (decl
) == FUNCTION_DECL
1643 && DECL_INITIAL (decl
) != 0
1644 && DECL_SAVED_INSNS (decl
) != 0
1645 && DECL_SAVED_INSNS (decl
)->saved_for_inline
1646 && (flag_keep_inline_functions
1647 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1648 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1651 output_inline_function (decl
);
1656 output_something
= 1;
1660 return output_something
;
1663 /* Issue appropriate warnings for the global declarations in VEC (of
1664 which there are LEN). Output debugging information for them. */
1667 check_global_declarations (tree
*vec
, int len
)
1672 for (i
= 0; i
< len
; i
++)
1676 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1677 && ! TREE_ASM_WRITTEN (decl
))
1678 /* Cancel the RTL for this decl so that, if debugging info
1679 output for global variables is still to come,
1680 this one will be omitted. */
1681 SET_DECL_RTL (decl
, NULL_RTX
);
1683 /* Warn about any function
1684 declared static but not defined.
1685 We don't warn about variables,
1686 because many programs have static variables
1687 that exist only to get some text into the object file. */
1688 if (TREE_CODE (decl
) == FUNCTION_DECL
1689 && (warn_unused_function
1690 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1691 && DECL_INITIAL (decl
) == 0
1692 && DECL_EXTERNAL (decl
)
1693 && ! DECL_ARTIFICIAL (decl
)
1694 && ! TREE_PUBLIC (decl
))
1696 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1697 pedwarn ("%J'%F' used but never defined", decl
, decl
);
1699 warning ("%J'%F' declared `static' but never defined", decl
, decl
);
1700 /* This symbol is effectively an "extern" declaration now. */
1701 TREE_PUBLIC (decl
) = 1;
1702 assemble_external (decl
);
1705 /* Warn about static fns or vars defined but not used. */
1706 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
1707 /* We don't warn about "static const" variables because the
1708 "rcs_id" idiom uses that construction. */
1709 || (warn_unused_variable
1710 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
1711 && ! DECL_IN_SYSTEM_HEADER (decl
)
1712 && ! TREE_USED (decl
)
1713 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1714 to handle multiple external decls in different scopes. */
1715 && ! TREE_USED (DECL_NAME (decl
))
1716 && ! DECL_EXTERNAL (decl
)
1717 && ! TREE_PUBLIC (decl
)
1718 /* A volatile variable might be used in some non-obvious way. */
1719 && ! TREE_THIS_VOLATILE (decl
)
1720 /* Global register variables must be declared to reserve them. */
1721 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
1722 /* Otherwise, ask the language. */
1723 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
1724 warning ("%J'%D' defined but not used", decl
, decl
);
1726 /* Avoid confusing the debug information machinery when there are
1728 if (errorcount
== 0 && sorrycount
== 0)
1730 timevar_push (TV_SYMOUT
);
1731 (*debug_hooks
->global_decl
) (decl
);
1732 timevar_pop (TV_SYMOUT
);
1737 /* Warn about a use of an identifier which was marked deprecated. */
1739 warn_deprecated_use (tree node
)
1741 if (node
== 0 || !warn_deprecated_decl
)
1745 warning ("`%s' is deprecated (declared at %s:%d)",
1746 IDENTIFIER_POINTER (DECL_NAME (node
)),
1747 DECL_SOURCE_FILE (node
), DECL_SOURCE_LINE (node
));
1748 else if (TYPE_P (node
))
1750 const char *what
= NULL
;
1751 tree decl
= TYPE_STUB_DECL (node
);
1753 if (TREE_CODE (TYPE_NAME (node
)) == IDENTIFIER_NODE
)
1754 what
= IDENTIFIER_POINTER (TYPE_NAME (node
));
1755 else if (TREE_CODE (TYPE_NAME (node
)) == TYPE_DECL
1756 && DECL_NAME (TYPE_NAME (node
)))
1757 what
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node
)));
1762 warning ("`%s' is deprecated (declared at %s:%d)", what
,
1763 DECL_SOURCE_FILE (decl
), DECL_SOURCE_LINE (decl
));
1765 warning ("`%s' is deprecated", what
);
1768 warning ("type is deprecated (declared at %s:%d)",
1769 DECL_SOURCE_FILE (decl
), DECL_SOURCE_LINE (decl
));
1771 warning ("type is deprecated");
1775 /* Save the current INPUT_LOCATION on the top entry in the
1776 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1777 INPUT_LOCATION accordingly. */
1780 push_srcloc (const char *file
, int line
)
1782 struct file_stack
*fs
;
1784 fs
= xmalloc (sizeof (struct file_stack
));
1785 fs
->location
= input_location
;
1786 fs
->next
= input_file_stack
;
1787 input_filename
= file
;
1789 input_file_stack
= fs
;
1790 input_file_stack_tick
++;
1793 /* Pop the top entry off the stack of presently open source files.
1794 Restore the INPUT_LOCATION from the new topmost entry on the
1800 struct file_stack
*fs
;
1802 fs
= input_file_stack
;
1803 input_location
= fs
->location
;
1804 input_file_stack
= fs
->next
;
1806 input_file_stack_tick
++;
1809 /* Compile an entire translation unit. Write a file of assembly
1810 output and various debugging dumps. */
1815 /* Initialize yet another pass. */
1817 init_final (main_input_filename
);
1818 coverage_init (aux_base_name
);
1820 timevar_push (TV_PARSE
);
1822 /* Call the parser, which parses the entire file (calling
1823 rest_of_compilation for each function). */
1824 (*lang_hooks
.parse_file
) (set_yydebug
);
1826 /* In case there were missing block closers,
1827 get us back to the global binding level. */
1828 (*lang_hooks
.clear_binding_stack
) ();
1830 /* Compilation is now finished except for writing
1831 what's left of the symbol table output. */
1832 timevar_pop (TV_PARSE
);
1834 if (flag_syntax_only
)
1837 (*lang_hooks
.decls
.final_write_globals
)();
1839 cgraph_varpool_assemble_pending_decls ();
1841 /* This must occur after the loop to output deferred functions.
1842 Else the coverage initializer would not be emitted if all the
1843 functions in this compilation unit were deferred. */
1846 /* Write out any pending weak symbol declarations. */
1850 /* Do dbx symbols. */
1851 timevar_push (TV_SYMOUT
);
1853 #ifdef DWARF2_UNWIND_INFO
1854 if (dwarf2out_do_frame ())
1855 dwarf2out_frame_finish ();
1858 (*debug_hooks
->finish
) (main_input_filename
);
1859 timevar_pop (TV_SYMOUT
);
1861 /* Output some stuff at end of file if nec. */
1863 dw2_output_indirect_constants ();
1865 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
1867 timevar_push (TV_DUMP
);
1868 open_dump_file (DFI_bp
, NULL
);
1872 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
1873 timevar_pop (TV_DUMP
);
1876 targetm
.asm_out
.file_end ();
1878 /* Attach a special .ident directive to the end of the file to identify
1879 the version of GCC which compiled this code. The format of the .ident
1880 string is patterned after the ones produced by native SVR4 compilers. */
1883 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
1884 IDENT_ASM_OP
, version_string
);
1887 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
1889 timevar_push (TV_DUMP
);
1890 dump_combine_total_stats (rtl_dump_file
);
1891 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
1892 timevar_pop (TV_DUMP
);
1896 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1897 and TYPE_DECL nodes.
1899 This does nothing for local (non-static) variables, unless the
1900 variable is a register variable with an ASMSPEC. In that case, or
1901 if the variable is not an automatic, it sets up the RTL and
1902 outputs any assembler code (label definition, storage allocation
1903 and initialization).
1905 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1906 the assembler symbol name to be used. TOP_LEVEL is nonzero
1907 if this declaration is not within a function. */
1910 rest_of_decl_compilation (tree decl
,
1911 const char *asmspec
,
1915 /* We deferred calling assemble_alias so that we could collect
1916 other attributes such as visibility. Emit the alias now. */
1919 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
1922 alias
= TREE_VALUE (TREE_VALUE (alias
));
1923 alias
= get_identifier (TREE_STRING_POINTER (alias
));
1924 assemble_alias (decl
, alias
);
1928 /* Forward declarations for nested functions are not "external",
1929 but we need to treat them as if they were. */
1930 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
1931 || TREE_CODE (decl
) == FUNCTION_DECL
)
1933 timevar_push (TV_VARCONST
);
1936 make_decl_rtl (decl
, asmspec
);
1938 /* Don't output anything when a tentative file-scope definition
1939 is seen. But at end of compilation, do output code for them.
1941 We do output all variables when unit-at-a-time is active and rely on
1942 callgraph code to defer them except for forward declarations
1943 (see gcc.c-torture/compile/920624-1.c) */
1945 || !DECL_DEFER_OUTPUT (decl
)
1946 || (flag_unit_at_a_time
&& DECL_INITIAL (decl
)))
1947 && !DECL_EXTERNAL (decl
))
1949 if (flag_unit_at_a_time
&& !cgraph_global_info_ready
1950 && TREE_CODE (decl
) != FUNCTION_DECL
&& top_level
)
1951 cgraph_varpool_finalize_decl (decl
);
1953 assemble_variable (decl
, top_level
, at_end
, 0);
1956 #ifdef ASM_FINISH_DECLARE_OBJECT
1957 if (decl
== last_assemble_variable_decl
)
1959 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
1964 timevar_pop (TV_VARCONST
);
1966 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
1968 if (decode_reg_name (asmspec
) >= 0)
1970 SET_DECL_RTL (decl
, NULL_RTX
);
1971 make_decl_rtl (decl
, asmspec
);
1975 error ("invalid register name `%s' for register variable", asmspec
);
1976 DECL_REGISTER (decl
) = 0;
1981 else if (TREE_CODE (decl
) == TYPE_DECL
)
1983 timevar_push (TV_SYMOUT
);
1984 debug_hooks
->type_decl (decl
, !top_level
);
1985 timevar_pop (TV_SYMOUT
);
1989 /* Called after finishing a record, union or enumeral type. */
1992 rest_of_type_compilation (tree type
, int toplev
)
1994 /* Avoid confusing the debug information machinery when there are
1996 if (errorcount
!= 0 || sorrycount
!= 0)
1999 timevar_push (TV_SYMOUT
);
2000 debug_hooks
->type_decl (TYPE_STUB_DECL (type
), !toplev
);
2001 timevar_pop (TV_SYMOUT
);
2004 /* Turn the RTL into assembly. */
2006 rest_of_handle_final (tree decl
, rtx insns
)
2008 timevar_push (TV_FINAL
);
2013 /* Get the function's name, as described by its RTL. This may be
2014 different from the DECL_NAME name used in the source file. */
2016 x
= DECL_RTL (decl
);
2017 if (GET_CODE (x
) != MEM
)
2020 if (GET_CODE (x
) != SYMBOL_REF
)
2022 fnname
= XSTR (x
, 0);
2024 assemble_start_function (decl
, fnname
);
2025 final_start_function (insns
, asm_out_file
, optimize
);
2026 final (insns
, asm_out_file
, optimize
, 0);
2027 final_end_function ();
2029 #ifdef IA64_UNWIND_INFO
2030 /* ??? The IA-64 ".handlerdata" directive must be issued before
2031 the ".endp" directive that closes the procedure descriptor. */
2032 output_function_exception_table ();
2035 assemble_end_function (decl
, fnname
);
2037 #ifndef IA64_UNWIND_INFO
2038 /* Otherwise, it feels unclean to switch sections in the middle. */
2039 output_function_exception_table ();
2043 fflush (asm_out_file
);
2045 /* Release all memory allocated by flow. */
2046 free_basic_block_vars (0);
2048 /* Release all memory held by regsets now. */
2049 regset_release_memory ();
2051 timevar_pop (TV_FINAL
);
2057 /* Run delay slot optimization. */
2059 rest_of_handle_delay_slots (tree decl
, rtx insns
)
2061 timevar_push (TV_DBR_SCHED
);
2062 open_dump_file (DFI_dbr
, decl
);
2064 dbr_schedule (insns
, rtl_dump_file
);
2066 close_dump_file (DFI_dbr
, print_rtl
, insns
);
2067 timevar_pop (TV_DBR_SCHED
);
2074 /* Convert register usage from flat register file usage to a stack
2077 rest_of_handle_stack_regs (tree decl
, rtx insns
)
2079 #if defined (HAVE_ATTR_length)
2080 /* If flow2 creates new instructions which need splitting
2081 and scheduling after reload is not done, they might not be
2082 split until final which doesn't allow splitting
2083 if HAVE_ATTR_length. */
2084 #ifdef INSN_SCHEDULING
2085 if (optimize
&& !flag_schedule_insns_after_reload
)
2090 timevar_push (TV_SHORTEN_BRANCH
);
2091 split_all_insns (1);
2092 timevar_pop (TV_SHORTEN_BRANCH
);
2096 timevar_push (TV_REG_STACK
);
2097 open_dump_file (DFI_stack
, decl
);
2099 if (reg_to_stack (insns
, rtl_dump_file
) && optimize
)
2101 if (cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
2102 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0))
2103 && flag_reorder_blocks
)
2105 reorder_basic_blocks ();
2106 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
2110 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
2111 timevar_pop (TV_REG_STACK
);
2117 /* Track the variables, ie. compute where the variable is stored at each position in function. */
2119 rest_of_handle_variable_tracking (tree decl
, rtx insns
)
2121 timevar_push (TV_VAR_TRACKING
);
2122 open_dump_file (DFI_vartrack
, decl
);
2124 variable_tracking_main ();
2126 close_dump_file (DFI_vartrack
, print_rtl_with_bb
, insns
);
2127 timevar_pop (TV_VAR_TRACKING
);
2130 /* Machine independent reorg pass. */
2132 rest_of_handle_machine_reorg (tree decl
, rtx insns
)
2134 timevar_push (TV_MACH_DEP
);
2135 open_dump_file (DFI_mach
, decl
);
2137 (*targetm
.machine_dependent_reorg
) ();
2139 close_dump_file (DFI_mach
, print_rtl
, insns
);
2140 timevar_pop (TV_MACH_DEP
);
2146 /* Run new register allocator. Return TRUE if we must exit
2147 rest_of_compilation upon return. */
2149 rest_of_handle_new_regalloc (tree decl
, rtx insns
)
2153 delete_trivially_dead_insns (insns
, max_reg_num ());
2156 timevar_pop (TV_LOCAL_ALLOC
);
2157 if (dump_file
[DFI_lreg
].enabled
)
2159 timevar_push (TV_DUMP
);
2161 close_dump_file (DFI_lreg
, NULL
, NULL
);
2162 timevar_pop (TV_DUMP
);
2165 /* XXX clean up the whole mess to bring live info in shape again. */
2166 timevar_push (TV_GLOBAL_ALLOC
);
2167 open_dump_file (DFI_greg
, decl
);
2169 build_insn_chain (insns
);
2170 failure
= reload (insns
, 0);
2172 timevar_pop (TV_GLOBAL_ALLOC
);
2174 if (dump_file
[DFI_greg
].enabled
)
2176 timevar_push (TV_DUMP
);
2178 dump_global_regs (rtl_dump_file
);
2180 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2181 timevar_pop (TV_DUMP
);
2187 reload_completed
= 1;
2192 /* Run old register allocator. Return TRUE if we must exit
2193 rest_of_compilation upon return. */
2195 rest_of_handle_old_regalloc (tree decl
, rtx insns
)
2200 /* Allocate the reg_renumber array. */
2201 allocate_reg_info (max_regno
, FALSE
, TRUE
);
2203 /* And the reg_equiv_memory_loc array. */
2204 reg_equiv_memory_loc
= xcalloc (max_regno
, sizeof (rtx
));
2206 allocate_initial_values (reg_equiv_memory_loc
);
2208 regclass (insns
, max_reg_num (), rtl_dump_file
);
2209 rebuild_notes
= local_alloc ();
2211 timevar_pop (TV_LOCAL_ALLOC
);
2213 /* Local allocation may have turned an indirect jump into a direct
2214 jump. If so, we must rebuild the JUMP_LABEL fields of jumping
2218 timevar_push (TV_JUMP
);
2220 rebuild_jump_labels (insns
);
2221 purge_all_dead_edges (0);
2223 timevar_pop (TV_JUMP
);
2226 if (dump_file
[DFI_lreg
].enabled
)
2228 timevar_push (TV_DUMP
);
2230 dump_flow_info (rtl_dump_file
);
2231 dump_local_alloc (rtl_dump_file
);
2233 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
2234 timevar_pop (TV_DUMP
);
2239 timevar_push (TV_GLOBAL_ALLOC
);
2240 open_dump_file (DFI_greg
, decl
);
2242 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2243 pass fixing up any insns that are invalid. */
2246 failure
= global_alloc (rtl_dump_file
);
2249 build_insn_chain (insns
);
2250 failure
= reload (insns
, 0);
2253 timevar_pop (TV_GLOBAL_ALLOC
);
2255 if (dump_file
[DFI_greg
].enabled
)
2257 timevar_push (TV_DUMP
);
2259 dump_global_regs (rtl_dump_file
);
2261 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2262 timevar_pop (TV_DUMP
);
2268 /* Run the regrename and cprop passes. */
2270 rest_of_handle_regrename (tree decl
, rtx insns
)
2272 timevar_push (TV_RENAME_REGISTERS
);
2273 open_dump_file (DFI_rnreg
, decl
);
2275 if (flag_rename_registers
)
2276 regrename_optimize ();
2277 if (flag_cprop_registers
)
2278 copyprop_hardreg_forward ();
2280 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
2281 timevar_pop (TV_RENAME_REGISTERS
);
2284 /* Reorder basic blocks. */
2286 rest_of_handle_reorder_blocks (tree decl
, rtx insns
)
2289 open_dump_file (DFI_bbro
, decl
);
2291 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2292 splitting possibly introduced more crossjumping opportunities. */
2293 changed
= cleanup_cfg (CLEANUP_EXPENSIVE
2294 | (!HAVE_conditional_execution
2295 ? CLEANUP_UPDATE_LIFE
: 0));
2297 if (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
)
2299 if (flag_reorder_blocks
)
2300 reorder_basic_blocks ();
2301 if (flag_reorder_blocks
2302 || (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
))
2303 changed
|= cleanup_cfg (CLEANUP_EXPENSIVE
2304 | (!HAVE_conditional_execution
2305 ? CLEANUP_UPDATE_LIFE
: 0));
2307 /* On conditional execution targets we can not update the life cheaply, so
2308 we deffer the updating to after both cleanups. This may lose some cases
2309 but should not be terribly bad. */
2310 if (changed
&& HAVE_conditional_execution
)
2311 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
2313 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
2316 #ifdef INSN_SCHEDULING
2317 /* Run instruction scheduler. */
2319 rest_of_handle_sched (tree decl
, rtx insns
)
2321 timevar_push (TV_SCHED
);
2323 /* Print function header into sched dump now
2324 because doing the sched analysis makes some of the dump. */
2325 if (optimize
> 0 && flag_schedule_insns
)
2327 open_dump_file (DFI_sched
, decl
);
2329 /* Do control and data sched analysis,
2330 and write some of the results to dump file. */
2332 schedule_insns (rtl_dump_file
);
2334 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
2336 timevar_pop (TV_SCHED
);
2341 /* Run second scheduling pass after reload. */
2343 rest_of_handle_sched2 (tree decl
, rtx insns
)
2345 timevar_push (TV_SCHED2
);
2346 open_dump_file (DFI_sched2
, decl
);
2348 /* Do control and data sched analysis again,
2349 and write some more of the results to dump file. */
2351 split_all_insns (1);
2353 if (flag_sched2_use_superblocks
|| flag_sched2_use_traces
)
2355 schedule_ebbs (rtl_dump_file
);
2356 /* No liveness updating code yet, but it should be easy to do.
2357 reg-stack recompute the liveness when needed for now. */
2358 count_or_remove_death_notes (NULL
, 1);
2359 cleanup_cfg (CLEANUP_EXPENSIVE
);
2362 schedule_insns (rtl_dump_file
);
2364 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
2365 timevar_pop (TV_SCHED2
);
2371 /* Register allocation pre-pass, to reduce number of moves necessary
2372 for two-address machines. */
2374 rest_of_handle_regmove (tree decl
, rtx insns
)
2376 timevar_push (TV_REGMOVE
);
2377 open_dump_file (DFI_regmove
, decl
);
2379 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
2381 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2382 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
2383 timevar_pop (TV_REGMOVE
);
2390 rest_of_handle_tracer (tree decl
, rtx insns
)
2392 open_dump_file (DFI_tracer
, decl
);
2394 dump_flow_info (rtl_dump_file
);
2396 cleanup_cfg (CLEANUP_EXPENSIVE
);
2397 reg_scan (insns
, max_reg_num (), 0);
2398 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
2401 /* If-conversion and CFG cleanup. */
2403 rest_of_handle_if_conversion (tree decl
, rtx insns
)
2405 open_dump_file (DFI_ce1
, decl
);
2406 if (flag_if_conversion
)
2408 timevar_push (TV_IFCVT
);
2410 dump_flow_info (rtl_dump_file
);
2411 cleanup_cfg (CLEANUP_EXPENSIVE
);
2412 reg_scan (insns
, max_reg_num (), 0);
2414 timevar_pop (TV_IFCVT
);
2416 timevar_push (TV_JUMP
);
2417 cleanup_cfg (CLEANUP_EXPENSIVE
);
2418 reg_scan (insns
, max_reg_num (), 0);
2419 timevar_pop (TV_JUMP
);
2420 close_dump_file (DFI_ce1
, print_rtl_with_bb
, get_insns ());
2423 /* Rerun if-conversion, as combine may have simplified things enough
2424 to now meet sequence length restrictions. */
2426 rest_of_handle_if_after_combine (tree decl
, rtx insns
)
2428 timevar_push (TV_IFCVT
);
2429 open_dump_file (DFI_ce2
, decl
);
2435 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
2436 timevar_pop (TV_IFCVT
);
2440 rest_of_handle_web (tree decl
, rtx insns
)
2442 open_dump_file (DFI_web
, decl
);
2443 timevar_push (TV_WEB
);
2445 delete_trivially_dead_insns (insns
, max_reg_num ());
2446 cleanup_cfg (CLEANUP_EXPENSIVE
);
2448 timevar_pop (TV_WEB
);
2449 close_dump_file (DFI_web
, print_rtl_with_bb
, insns
);
2450 reg_scan (get_insns (), max_reg_num (), 0);
2453 /* Do branch profiling and static profile estimation passes. */
2455 rest_of_handle_branch_prob (tree decl
, rtx insns
)
2459 timevar_push (TV_BRANCH_PROB
);
2460 open_dump_file (DFI_bp
, decl
);
2462 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2465 /* Discover and record the loop depth at the head of each basic
2466 block. The loop infrastructure does the real job for us. */
2467 flow_loops_find (&loops
, LOOP_TREE
);
2470 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2472 /* Estimate using heuristics if no profiling info is available. */
2473 if (flag_guess_branch_prob
)
2474 estimate_probability (&loops
);
2476 flow_loops_free (&loops
);
2477 free_dominance_info (CDI_DOMINATORS
);
2478 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2479 timevar_pop (TV_BRANCH_PROB
);
2482 /* Do optimizations based on expression value profiles. */
2484 rest_of_handle_value_profile_transformations (tree decl
, rtx insns
)
2486 open_dump_file (DFI_vpt
, decl
);
2487 timevar_push (TV_VPT
);
2489 if (value_profile_transformations ())
2490 cleanup_cfg (CLEANUP_EXPENSIVE
);
2492 timevar_pop (TV_VPT
);
2493 close_dump_file (DFI_vpt
, print_rtl_with_bb
, insns
);
2496 /* Do control and data flow analysis; write some of the results to the
2499 rest_of_handle_cfg (tree decl
, rtx insns
)
2501 open_dump_file (DFI_cfg
, decl
);
2503 dump_flow_info (rtl_dump_file
);
2505 cleanup_cfg (CLEANUP_EXPENSIVE
2506 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2508 /* It may make more sense to mark constant functions after dead code is
2509 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2510 may insert code making function non-constant, but we still must consider
2511 it as constant, otherwise -fbranch-probabilities will not read data back.
2513 life_analysis rarely eliminates modification of external memory.
2517 /* Alias analysis depends on this information and mark_constant_function
2518 depends on alias analysis. */
2519 reg_scan (insns
, max_reg_num (), 1);
2520 mark_constant_function ();
2523 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2526 /* Purge addressofs. */
2528 rest_of_handle_addressof (tree decl
, rtx insns
)
2530 open_dump_file (DFI_addressof
, decl
);
2532 purge_addressof (insns
);
2533 if (optimize
&& purge_all_dead_edges (0))
2534 delete_unreachable_blocks ();
2535 reg_scan (insns
, max_reg_num (), 1);
2537 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2540 /* We may have potential sibling or tail recursion sites. Select one
2541 (of possibly multiple) methods of performing the call. */
2543 rest_of_handle_sibling_calls (rtx insns
)
2546 optimize_sibling_and_tail_recursive_calls ();
2548 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2549 free_bb_for_insn ();
2550 find_exception_handler_labels ();
2551 rebuild_jump_labels (insns
);
2552 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2554 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2555 notes before simplifying cfg and we must do lowering after sibcall
2556 that unhides parts of RTL chain and cleans up the CFG.
2558 Until sibcall is replaced by tree-level optimizer, lets just
2559 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2560 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2561 if (GET_CODE (insn
) == NOTE
2562 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2565 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2568 /* Perform jump bypassing and control flow optimizations. */
2570 rest_of_handle_jump_bypass (tree decl
, rtx insns
)
2572 timevar_push (TV_BYPASS
);
2573 open_dump_file (DFI_bypass
, decl
);
2575 cleanup_cfg (CLEANUP_EXPENSIVE
);
2576 reg_scan (insns
, max_reg_num (), 1);
2578 if (bypass_jumps (rtl_dump_file
))
2580 rebuild_jump_labels (insns
);
2581 cleanup_cfg (CLEANUP_EXPENSIVE
);
2582 delete_trivially_dead_insns (insns
, max_reg_num ());
2585 close_dump_file (DFI_bypass
, print_rtl_with_bb
, insns
);
2586 timevar_pop (TV_BYPASS
);
2590 #ifdef ENABLE_CHECKING
2591 verify_flow_info ();
2595 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2596 if we must exit rest_of_compilation upon return. */
2598 rest_of_handle_inlining (tree decl
)
2605 /* If we are reconsidering an inline function at the end of
2606 compilation, skip the stuff for making it inline. */
2607 if (cfun
->rtl_inline_init
)
2609 cfun
->rtl_inline_init
= 1;
2611 /* If this is nested inside an inlined external function, pretend
2612 it was only declared. Since we cannot inline such functions,
2613 generating code for this one is not only not necessary but will
2614 confuse some debugging output writers. */
2615 for (parent
= DECL_CONTEXT (current_function_decl
);
2616 parent
!= NULL_TREE
;
2617 parent
= get_containing_scope (parent
))
2618 if (TREE_CODE (parent
) == FUNCTION_DECL
2619 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2621 DECL_INITIAL (decl
) = 0;
2624 else if (TYPE_P (parent
))
2625 /* A function in a local class should be treated normally. */
2628 /* If requested, consider whether to make this function inline. */
2629 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2630 || flag_inline_functions
)
2632 timevar_push (TV_INTEGRATION
);
2633 lose
= function_cannot_inline_p (decl
);
2634 timevar_pop (TV_INTEGRATION
);
2635 if (lose
|| ! optimize
)
2637 if (warn_inline
&& lose
&& DECL_INLINE (decl
))
2639 char *msg
= concat ("%J", lose
, NULL
);
2640 warning (msg
, decl
);
2643 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2644 /* Don't really compile an extern inline function.
2645 If we can't make it inline, pretend
2646 it was only declared. */
2647 if (DECL_EXTERNAL (decl
))
2649 DECL_INITIAL (decl
) = 0;
2654 inlinable
= DECL_INLINE (decl
) = 1;
2657 insns
= get_insns ();
2659 /* Dump the rtl code if we are dumping rtl. */
2661 if (open_dump_file (DFI_rtl
, decl
))
2663 if (DECL_SAVED_INSNS (decl
) && DECL_SAVED_INSNS (decl
)->saved_for_inline
)
2664 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2665 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2668 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2669 sorts of eh initialization. Delay this until after the
2670 initial rtl dump so that we can see the original nesting. */
2671 convert_from_eh_region_ranges ();
2673 /* If function is inline, and we don't yet know whether to
2674 compile it by itself, defer decision till end of compilation.
2675 wrapup_global_declarations will (indirectly) call
2676 rest_of_compilation again for those functions that need to
2677 be output. Also defer those functions that we are supposed
2681 || (DECL_INLINE (decl
)
2682 /* Egad. This RTL deferral test conflicts with Fortran assumptions
2683 for unreferenced symbols. See g77.f-torture/execute/980520-1.f.
2684 But removing this line from the check breaks all languages that
2685 use the call graph to output symbols. This hard-coded check is
2686 the least invasive work-around. */
2687 && (flag_inline_functions
2688 || strcmp (lang_hooks
.name
, "GNU F77") == 0)
2689 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2690 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2691 && ! flag_keep_inline_functions
)
2692 || DECL_EXTERNAL (decl
))))
2693 DECL_DEFER_OUTPUT (decl
) = 1;
2695 if (DECL_INLINE (decl
))
2696 /* DWARF wants separate debugging info for abstract and
2697 concrete instances of all inline functions, including those
2698 declared inline but not inlined, and those inlined even
2699 though they weren't declared inline. Conveniently, that's
2700 what DECL_INLINE means at this point. */
2701 (*debug_hooks
->deferred_inline_function
) (decl
);
2703 if (DECL_DEFER_OUTPUT (decl
))
2705 /* If -Wreturn-type, we have to do a bit of compilation. We just
2706 want to call cleanup the cfg to figure out whether or not we can
2707 fall off the end of the function; we do the minimum amount of
2708 work necessary to make that safe. */
2709 if (warn_return_type
)
2711 int saved_optimize
= optimize
;
2714 rebuild_jump_labels (insns
);
2715 find_exception_handler_labels ();
2716 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2717 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2718 optimize
= saved_optimize
;
2720 /* CFG is no longer maintained up-to-date. */
2721 free_bb_for_insn ();
2724 set_nothrow_function_flags ();
2725 if (current_function_nothrow
)
2726 /* Now we know that this can't throw; set the flag for the benefit
2727 of other functions later in this translation unit. */
2728 TREE_NOTHROW (current_function_decl
) = 1;
2730 timevar_push (TV_INTEGRATION
);
2731 save_for_inline (decl
);
2732 timevar_pop (TV_INTEGRATION
);
2733 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2737 /* If specified extern inline but we aren't inlining it, we are
2738 done. This goes for anything that gets here with DECL_EXTERNAL
2739 set, not just things with DECL_INLINE. */
2740 return (bool) DECL_EXTERNAL (decl
);
2743 /* Try to identify useless null pointer tests and delete them. */
2745 rest_of_handle_null_pointer (tree decl
, rtx insns
)
2747 open_dump_file (DFI_null
, decl
);
2749 dump_flow_info (rtl_dump_file
);
2751 if (delete_null_pointer_checks (insns
))
2752 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2754 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2757 /* Try combining insns through substitution. */
2759 rest_of_handle_combine (tree decl
, rtx insns
)
2761 int rebuild_jump_labels_after_combine
= 0;
2763 timevar_push (TV_COMBINE
);
2764 open_dump_file (DFI_combine
, decl
);
2766 rebuild_jump_labels_after_combine
2767 = combine_instructions (insns
, max_reg_num ());
2769 /* Combining insns may have turned an indirect jump into a
2770 direct jump. Rebuild the JUMP_LABEL fields of jumping
2772 if (rebuild_jump_labels_after_combine
)
2774 timevar_push (TV_JUMP
);
2775 rebuild_jump_labels (insns
);
2776 timevar_pop (TV_JUMP
);
2778 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2781 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
2782 timevar_pop (TV_COMBINE
);
2787 /* Perform life analysis. */
2789 rest_of_handle_life (tree decl
, rtx insns
)
2791 open_dump_file (DFI_life
, decl
);
2794 #ifdef ENABLE_CHECKING
2795 verify_flow_info ();
2797 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
2799 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
2801 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2802 timevar_pop (TV_FLOW
);
2804 if (warn_uninitialized
)
2806 uninitialized_vars_warning (DECL_INITIAL (decl
));
2808 setjmp_args_warning ();
2813 if (!flag_new_regalloc
&& initialize_uninitialized_subregs ())
2815 /* Insns were inserted, and possibly pseudos created, so
2816 things might look a bit different. */
2817 insns
= get_insns ();
2818 allocate_reg_life_data ();
2819 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
2820 PROP_LOG_LINKS
| PROP_REG_INFO
| PROP_DEATH_NOTES
);
2826 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
2831 /* Perform common subexpression elimination. Nonzero value from
2832 `cse_main' means that jumps were simplified and some code may now
2833 be unreachable, so do jump optimization again. */
2835 rest_of_handle_cse (tree decl
, rtx insns
)
2839 open_dump_file (DFI_cse
, decl
);
2841 dump_flow_info (rtl_dump_file
);
2842 timevar_push (TV_CSE
);
2844 reg_scan (insns
, max_reg_num (), 1);
2846 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2848 rebuild_jump_labels (insns
);
2849 if (purge_all_dead_edges (0))
2850 delete_unreachable_blocks ();
2852 delete_trivially_dead_insns (insns
, max_reg_num ());
2854 /* If we are not running more CSE passes, then we are no longer
2855 expecting CSE to be run. But always rerun it in a cheap mode. */
2856 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2858 if (tem
|| optimize
> 1)
2859 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2860 /* Try to identify useless null pointer tests and delete them. */
2861 if (flag_delete_null_pointer_checks
)
2863 timevar_push (TV_JUMP
);
2865 if (delete_null_pointer_checks (insns
))
2866 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2867 timevar_pop (TV_JUMP
);
2870 /* The second pass of jump optimization is likely to have
2871 removed a bunch more instructions. */
2872 renumber_insns (rtl_dump_file
);
2874 timevar_pop (TV_CSE
);
2875 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2878 /* Run second CSE pass after loop optimizations. */
2880 rest_of_handle_cse2 (tree decl
, rtx insns
)
2884 timevar_push (TV_CSE2
);
2885 open_dump_file (DFI_cse2
, decl
);
2887 dump_flow_info (rtl_dump_file
);
2888 /* CFG is no longer maintained up-to-date. */
2889 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
2891 /* Run a pass to eliminate duplicated assignments to condition code
2892 registers. We have to run this after bypass_jumps, because it
2893 makes it harder for that pass to determine whether a jump can be
2895 cse_condition_code_reg ();
2897 purge_all_dead_edges (0);
2898 delete_trivially_dead_insns (insns
, max_reg_num ());
2902 timevar_push (TV_JUMP
);
2903 rebuild_jump_labels (insns
);
2904 cleanup_cfg (CLEANUP_EXPENSIVE
);
2905 timevar_pop (TV_JUMP
);
2907 reg_scan (insns
, max_reg_num (), 0);
2908 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
2910 timevar_pop (TV_CSE2
);
2913 /* Perform global cse. */
2915 rest_of_handle_gcse (tree decl
, rtx insns
)
2917 int save_csb
, save_cfj
;
2920 timevar_push (TV_GCSE
);
2921 open_dump_file (DFI_gcse
, decl
);
2923 tem
= gcse_main (insns
, rtl_dump_file
);
2924 rebuild_jump_labels (insns
);
2925 delete_trivially_dead_insns (insns
, max_reg_num ());
2927 save_csb
= flag_cse_skip_blocks
;
2928 save_cfj
= flag_cse_follow_jumps
;
2929 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2931 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2932 if (current_function_calls_constant_p
)
2933 purge_builtin_constant_p ();
2935 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2937 if (flag_expensive_optimizations
)
2939 timevar_push (TV_CSE
);
2940 reg_scan (insns
, max_reg_num (), 1);
2941 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2942 purge_all_dead_edges (0);
2943 delete_trivially_dead_insns (insns
, max_reg_num ());
2944 timevar_pop (TV_CSE
);
2945 cse_not_expected
= !flag_rerun_cse_after_loop
;
2948 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2949 things up. Then possibly re-run CSE again. */
2953 timevar_push (TV_JUMP
);
2954 rebuild_jump_labels (insns
);
2955 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2956 timevar_pop (TV_JUMP
);
2958 if (flag_expensive_optimizations
)
2960 timevar_push (TV_CSE
);
2961 reg_scan (insns
, max_reg_num (), 1);
2962 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2963 purge_all_dead_edges (0);
2964 delete_trivially_dead_insns (insns
, max_reg_num ());
2965 timevar_pop (TV_CSE
);
2969 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2970 timevar_pop (TV_GCSE
);
2973 flag_cse_skip_blocks
= save_csb
;
2974 flag_cse_follow_jumps
= save_cfj
;
2975 #ifdef ENABLE_CHECKING
2976 verify_flow_info ();
2980 /* Move constant computations out of loops. */
2982 rest_of_handle_loop_optimize (tree decl
, rtx insns
)
2984 int do_unroll
, do_prefetch
;
2986 timevar_push (TV_LOOP
);
2987 delete_dead_jumptables ();
2988 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2989 open_dump_file (DFI_loop
, decl
);
2991 /* CFG is no longer maintained up-to-date. */
2992 free_bb_for_insn ();
2994 if (flag_unroll_loops
)
2995 do_unroll
= LOOP_AUTO_UNROLL
; /* Having two unrollers is useless. */
2997 do_unroll
= flag_old_unroll_loops
? LOOP_UNROLL
: LOOP_AUTO_UNROLL
;
2998 do_prefetch
= flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0;
3000 if (flag_rerun_loop_opt
)
3002 cleanup_barriers ();
3004 /* We only want to perform unrolling once. */
3005 loop_optimize (insns
, rtl_dump_file
, do_unroll
);
3008 /* The first call to loop_optimize makes some instructions
3009 trivially dead. We delete those instructions now in the
3010 hope that doing so will make the heuristics in loop work
3011 better and possibly speed up compilation. */
3012 delete_trivially_dead_insns (insns
, max_reg_num ());
3014 /* The regscan pass is currently necessary as the alias
3015 analysis code depends on this information. */
3016 reg_scan (insns
, max_reg_num (), 1);
3018 cleanup_barriers ();
3019 loop_optimize (insns
, rtl_dump_file
, do_unroll
| LOOP_BCT
| do_prefetch
);
3021 /* Loop can create trivially dead instructions. */
3022 delete_trivially_dead_insns (insns
, max_reg_num ());
3023 close_dump_file (DFI_loop
, print_rtl
, insns
);
3024 timevar_pop (TV_LOOP
);
3025 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3030 /* Perform loop optimizations. It might be better to do them a bit
3031 sooner, but we want the profile feedback to work more
3034 rest_of_handle_loop2 (tree decl
, rtx insns
)
3036 struct loops
*loops
;
3037 timevar_push (TV_LOOP
);
3038 open_dump_file (DFI_loop2
, decl
);
3040 dump_flow_info (rtl_dump_file
);
3042 loops
= loop_optimizer_init (rtl_dump_file
);
3046 /* The optimizations: */
3047 if (flag_unswitch_loops
)
3048 unswitch_loops (loops
);
3050 if (flag_peel_loops
|| flag_unroll_loops
)
3051 unroll_and_peel_loops (loops
,
3052 (flag_peel_loops
? UAP_PEEL
: 0) |
3053 (flag_unroll_loops
? UAP_UNROLL
: 0) |
3054 (flag_unroll_all_loops
? UAP_UNROLL_ALL
: 0));
3056 loop_optimizer_finalize (loops
, rtl_dump_file
);
3059 cleanup_cfg (CLEANUP_EXPENSIVE
);
3060 delete_trivially_dead_insns (insns
, max_reg_num ());
3061 reg_scan (insns
, max_reg_num (), 0);
3063 dump_flow_info (rtl_dump_file
);
3064 close_dump_file (DFI_loop2
, print_rtl_with_bb
, get_insns ());
3065 timevar_pop (TV_LOOP
);
3069 /* This is called from finish_function (within langhooks.parse_file)
3070 after each top-level definition is parsed.
3071 It is supposed to compile that function or variable
3072 and output the assembler code for it.
3073 After we return, the tree storage is freed. */
3076 rest_of_compilation (tree decl
)
3080 timevar_push (TV_REST_OF_COMPILATION
);
3082 /* Register rtl specific functions for cfg. */
3083 rtl_register_cfg_hooks ();
3085 /* Now that we're out of the frontend, we shouldn't have any more
3086 CONCATs anywhere. */
3087 generating_concat_p
= 0;
3089 /* When processing delayed functions, prepare_function_start() won't
3090 have been run to re-initialize it. */
3091 cse_not_expected
= ! optimize
;
3093 /* First, make sure that NOTE_BLOCK is set correctly for each
3094 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3095 if (!cfun
->x_whole_function_mode_p
)
3098 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3099 tree in sensible shape. So, we just recalculate it here. */
3100 if (cfun
->x_whole_function_mode_p
)
3105 if (rest_of_handle_inlining (decl
))
3106 goto exit_rest_of_compilation
;
3108 /* If we're emitting a nested function, make sure its parent gets
3109 emitted as well. Doing otherwise confuses debug info. */
3112 for (parent
= DECL_CONTEXT (current_function_decl
);
3113 parent
!= NULL_TREE
;
3114 parent
= get_containing_scope (parent
))
3115 if (TREE_CODE (parent
) == FUNCTION_DECL
)
3116 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
3119 /* We are now committed to emitting code for this function. Do any
3120 preparation, such as emitting abstract debug info for the inline
3121 before it gets mangled by optimization. */
3122 if (cgraph_function_possibly_inlined_p (decl
))
3123 (*debug_hooks
->outlining_inline_function
) (decl
);
3125 /* Remove any notes we don't need. That will make iterating
3126 over the instruction sequence faster, and allow the garbage
3127 collector to reclaim the memory used by the notes. */
3128 remove_unnecessary_notes ();
3133 /* Initialize some variables used by the optimizers. */
3134 init_function_for_compilation ();
3136 if (! DECL_DEFER_OUTPUT (decl
))
3137 TREE_ASM_WRITTEN (decl
) = 1;
3139 /* Now that integrate will no longer see our rtl, we need not
3140 distinguish between the return value of this function and the
3141 return value of called functions. Also, we can remove all SETs
3142 of subregs of hard registers; they are only here because of
3143 integrate. Also, we can now initialize pseudos intended to
3144 carry magic hard reg data throughout the function. */
3145 rtx_equal_function_value_matters
= 0;
3146 purge_hard_subreg_sets (get_insns ());
3148 /* Early return if there were errors. We can run afoul of our
3149 consistency checks, and there's not really much point in fixing them.
3150 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3151 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
3152 || errorcount
|| sorrycount
)
3153 goto exit_rest_of_compilation
;
3155 timevar_push (TV_JUMP
);
3156 open_dump_file (DFI_sibling
, decl
);
3157 insns
= get_insns ();
3158 rebuild_jump_labels (insns
);
3159 find_exception_handler_labels ();
3160 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3162 delete_unreachable_blocks ();
3164 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3165 if (flag_guess_branch_prob
)
3167 timevar_push (TV_BRANCH_PROB
);
3168 note_prediction_to_br_prob ();
3169 timevar_pop (TV_BRANCH_PROB
);
3172 if (flag_optimize_sibling_calls
)
3173 rest_of_handle_sibling_calls (insns
);
3175 /* We have to issue these warnings now already, because CFG cleanups
3176 further down may destroy the required information. However, this
3177 must be done after the sibcall optimization pass because the barrier
3178 emitted for noreturn calls that are candidate for the optimization
3179 is folded into the CALL_PLACEHOLDER until after this pass, so the
3180 CFG is inaccurate. */
3181 check_function_return_warnings ();
3183 timevar_pop (TV_JUMP
);
3185 insn_locators_initialize ();
3186 /* Complete generation of exception handling code. */
3189 timevar_push (TV_JUMP
);
3190 open_dump_file (DFI_eh
, decl
);
3192 finish_eh_generation ();
3194 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
3195 timevar_pop (TV_JUMP
);
3198 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3199 generation, which might create new sets. */
3200 emit_initial_value_sets ();
3203 /* If we are doing position-independent code generation, now
3204 is the time to output special prologues and epilogues.
3205 We do not want to do this earlier, because it just clutters
3206 up inline functions with meaningless insns. */
3211 insns
= get_insns ();
3213 /* Copy any shared structure that should not be shared. */
3214 unshare_all_rtl (current_function_decl
, insns
);
3216 #ifdef SETJMP_VIA_SAVE_AREA
3217 /* This must be performed before virtual register instantiation.
3218 Please be aware the everything in the compiler that can look
3219 at the RTL up to this point must understand that REG_SAVE_AREA
3220 is just like a use of the REG contained inside. */
3221 if (current_function_calls_alloca
)
3222 optimize_save_area_alloca (insns
);
3225 /* Instantiate all virtual registers. */
3226 instantiate_virtual_regs (current_function_decl
, insns
);
3228 open_dump_file (DFI_jump
, decl
);
3230 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3231 are initialized and to compute whether control can drop off the end
3234 timevar_push (TV_JUMP
);
3235 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3236 before jump optimization switches branch directions. */
3237 if (flag_guess_branch_prob
)
3238 expected_value_to_br_prob ();
3240 reg_scan (insns
, max_reg_num (), 0);
3241 rebuild_jump_labels (insns
);
3242 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3243 delete_trivially_dead_insns (insns
, max_reg_num ());
3245 dump_flow_info (rtl_dump_file
);
3246 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
3247 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3251 free_bb_for_insn ();
3252 copy_loop_headers (insns
);
3253 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3255 purge_line_number_notes (insns
);
3257 timevar_pop (TV_JUMP
);
3258 close_dump_file (DFI_jump
, print_rtl
, insns
);
3260 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3261 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
3262 goto exit_rest_of_compilation
;
3264 timevar_push (TV_JUMP
);
3267 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3269 if (flag_delete_null_pointer_checks
)
3270 rest_of_handle_null_pointer (decl
, insns
);
3272 /* Jump optimization, and the removal of NULL pointer checks, may
3273 have reduced the number of instructions substantially. CSE, and
3274 future passes, allocate arrays whose dimensions involve the
3275 maximum instruction UID, so if we can reduce the maximum UID
3276 we'll save big on memory. */
3277 renumber_insns (rtl_dump_file
);
3278 timevar_pop (TV_JUMP
);
3280 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
3285 rest_of_handle_cse (decl
, insns
);
3287 rest_of_handle_addressof (decl
, insns
);
3294 rest_of_handle_gcse (decl
, insns
);
3296 if (flag_loop_optimize
)
3297 rest_of_handle_loop_optimize (decl
, insns
);
3300 rest_of_handle_jump_bypass (decl
, insns
);
3303 timevar_push (TV_FLOW
);
3305 rest_of_handle_cfg (decl
, insns
);
3308 || profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3310 rest_of_handle_branch_prob (decl
, insns
);
3312 if (flag_branch_probabilities
3313 && flag_profile_values
3314 && flag_value_profile_transformations
)
3315 rest_of_handle_value_profile_transformations (decl
, insns
);
3317 /* Remove the death notes created for vpt. */
3318 if (flag_profile_values
)
3319 count_or_remove_death_notes (NULL
, 1);
3323 rest_of_handle_if_conversion (decl
, insns
);
3326 rest_of_handle_tracer (decl
, insns
);
3329 && (flag_unswitch_loops
3331 || flag_unroll_loops
))
3332 rest_of_handle_loop2 (decl
, insns
);
3335 rest_of_handle_web (decl
, insns
);
3337 if (flag_rerun_cse_after_loop
)
3338 rest_of_handle_cse2 (decl
, insns
);
3340 cse_not_expected
= 1;
3342 rest_of_handle_life (decl
, insns
);
3345 rest_of_handle_combine (decl
, insns
);
3347 if (flag_if_conversion
)
3348 rest_of_handle_if_after_combine (decl
, insns
);
3350 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3351 rest_of_handle_regmove (decl
, insns
);
3353 /* Do unconditional splitting before register allocation to allow machine
3354 description to add extra information not needed previously. */
3355 split_all_insns (1);
3357 #ifdef OPTIMIZE_MODE_SWITCHING
3358 timevar_push (TV_MODE_SWITCH
);
3361 optimize_mode_switching (NULL
);
3364 timevar_pop (TV_MODE_SWITCH
);
3367 /* Any of the several passes since flow1 will have munged register
3368 lifetime data a bit. We need it to be up to date for scheduling
3369 (see handling of reg_known_equiv in init_alias_analysis). */
3370 recompute_reg_usage (insns
, !optimize_size
);
3372 #ifdef INSN_SCHEDULING
3373 rest_of_handle_sched (decl
, insns
);
3376 /* Determine if the current function is a leaf before running reload
3377 since this can impact optimizations done by the prologue and
3378 epilogue thus changing register elimination offsets. */
3379 current_function_is_leaf
= leaf_function_p ();
3381 timevar_push (TV_LOCAL_ALLOC
);
3382 open_dump_file (DFI_lreg
, decl
);
3384 if (flag_new_regalloc
)
3386 if (rest_of_handle_new_regalloc (decl
, insns
))
3387 goto exit_rest_of_compilation
;
3391 if (rest_of_handle_old_regalloc (decl
, insns
))
3392 goto exit_rest_of_compilation
;
3397 open_dump_file (DFI_postreload
, decl
);
3399 /* Do a very simple CSE pass over just the hard registers. */
3402 timevar_push (TV_RELOAD_CSE_REGS
);
3403 reload_cse_regs (insns
);
3404 /* reload_cse_regs can eliminate potentially-trapping MEMs.
3405 Remove any EH edges associated with them. */
3406 if (flag_non_call_exceptions
)
3407 purge_all_dead_edges (0);
3408 timevar_pop (TV_RELOAD_CSE_REGS
);
3411 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3413 /* Re-create the death notes which were deleted during reload. */
3414 timevar_push (TV_FLOW2
);
3415 open_dump_file (DFI_flow2
, decl
);
3417 #ifdef ENABLE_CHECKING
3418 verify_flow_info ();
3421 /* If optimizing, then go ahead and split insns now. */
3425 split_all_insns (0);
3427 if (flag_branch_target_load_optimize
)
3429 open_dump_file (DFI_branch_target_load
, decl
);
3431 branch_target_load_optimize (insns
, false);
3433 close_dump_file (DFI_branch_target_load
, print_rtl_with_bb
, insns
);
3439 cleanup_cfg (CLEANUP_EXPENSIVE
);
3441 /* On some machines, the prologue and epilogue code, or parts thereof,
3442 can be represented as RTL. Doing so lets us schedule insns between
3443 it and the rest of the code and also allows delayed branch
3444 scheduling to operate in the epilogue. */
3445 thread_prologue_and_epilogue_insns (insns
);
3446 epilogue_completed
= 1;
3450 life_analysis (insns
, rtl_dump_file
, PROP_POSTRELOAD
);
3451 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3452 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3454 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3455 even for machines with possibly nonzero RETURN_POPS_ARGS
3456 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3457 push instructions will have popping returns. */
3458 #ifndef PUSH_ROUNDING
3459 if (!ACCUMULATE_OUTGOING_ARGS
)
3461 combine_stack_adjustments ();
3466 flow2_completed
= 1;
3468 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3469 timevar_pop (TV_FLOW2
);
3471 #ifdef HAVE_peephole2
3472 if (optimize
> 0 && flag_peephole2
)
3474 timevar_push (TV_PEEPHOLE2
);
3475 open_dump_file (DFI_peephole2
, decl
);
3477 peephole2_optimize (rtl_dump_file
);
3479 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3480 timevar_pop (TV_PEEPHOLE2
);
3484 open_dump_file (DFI_ce3
, decl
);
3486 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3487 splitting possibly introduced more crossjumping opportunities. */
3488 cleanup_cfg (CLEANUP_EXPENSIVE
3489 | CLEANUP_UPDATE_LIFE
3490 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3491 if (flag_if_conversion2
)
3493 timevar_push (TV_IFCVT2
);
3497 timevar_pop (TV_IFCVT2
);
3499 close_dump_file (DFI_ce3
, print_rtl_with_bb
, insns
);
3503 if (flag_rename_registers
|| flag_cprop_registers
)
3504 rest_of_handle_regrename (decl
, insns
);
3506 rest_of_handle_reorder_blocks (decl
, insns
);
3509 if (flag_branch_target_load_optimize2
)
3511 /* Leave this a warning for now so that it is possible to experiment
3512 with running this pass twice. In 3.6, we should either make this
3513 an error, or use separate dump files. */
3514 if (flag_branch_target_load_optimize
)
3515 warning ("branch target register load optimization is not intended "
3518 open_dump_file (DFI_branch_target_load
, decl
);
3520 branch_target_load_optimize (insns
, true);
3522 close_dump_file (DFI_branch_target_load
, print_rtl_with_bb
, insns
);
3527 #ifdef INSN_SCHEDULING
3528 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3529 rest_of_handle_sched2 (decl
, insns
);
3532 #ifdef LEAF_REGISTERS
3533 current_function_uses_only_leaf_regs
3534 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3538 rest_of_handle_stack_regs (decl
, insns
);
3541 compute_alignments ();
3543 if (flag_var_tracking
)
3544 rest_of_handle_variable_tracking (decl
, insns
);
3546 /* CFG is no longer maintained up-to-date. */
3547 free_bb_for_insn ();
3549 if (targetm
.machine_dependent_reorg
!= 0)
3550 rest_of_handle_machine_reorg (decl
, insns
);
3552 purge_line_number_notes (insns
);
3553 cleanup_barriers ();
3556 if (optimize
> 0 && flag_delayed_branch
)
3557 rest_of_handle_delay_slots (decl
, insns
);
3560 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3561 timevar_push (TV_SHORTEN_BRANCH
);
3562 split_all_insns_noflow ();
3563 timevar_pop (TV_SHORTEN_BRANCH
);
3566 convert_to_eh_region_ranges ();
3568 /* Shorten branches. */
3569 timevar_push (TV_SHORTEN_BRANCH
);
3570 shorten_branches (get_insns ());
3571 timevar_pop (TV_SHORTEN_BRANCH
);
3573 set_nothrow_function_flags ();
3574 if (current_function_nothrow
)
3575 /* Now we know that this can't throw; set the flag for the benefit
3576 of other functions later in this translation unit. */
3577 TREE_NOTHROW (current_function_decl
) = 1;
3579 rest_of_handle_final (decl
, insns
);
3581 /* Write DBX symbols if requested. */
3583 /* Note that for those inline functions where we don't initially
3584 know for certain that we will be generating an out-of-line copy,
3585 the first invocation of this routine (rest_of_compilation) will
3586 skip over this code by doing a `goto exit_rest_of_compilation;'.
3587 Later on, wrapup_global_declarations will (indirectly) call
3588 rest_of_compilation again for those inline functions that need
3589 to have out-of-line copies generated. During that call, we
3590 *will* be routed past here. */
3592 timevar_push (TV_SYMOUT
);
3593 (*debug_hooks
->function_decl
) (decl
);
3594 timevar_pop (TV_SYMOUT
);
3596 exit_rest_of_compilation
:
3598 coverage_end_function ();
3600 /* In case the function was not output,
3601 don't leave any temporary anonymous types
3602 queued up for sdb output. */
3603 #ifdef SDB_DEBUGGING_INFO
3604 if (write_symbols
== SDB_DEBUG
)
3605 sdbout_types (NULL_TREE
);
3608 reload_completed
= 0;
3609 epilogue_completed
= 0;
3610 flow2_completed
= 0;
3613 timevar_push (TV_FINAL
);
3615 /* Clear out the insn_length contents now that they are no
3617 init_insn_lengths ();
3619 /* Show no temporary slots allocated. */
3622 free_basic_block_vars (0);
3623 free_bb_for_insn ();
3625 timevar_pop (TV_FINAL
);
3627 if ((*targetm
.binds_local_p
) (current_function_decl
))
3629 int pref
= cfun
->preferred_stack_boundary
;
3630 if (cfun
->recursive_call_emit
3631 && cfun
->stack_alignment_needed
> cfun
->preferred_stack_boundary
)
3632 pref
= cfun
->stack_alignment_needed
;
3633 cgraph_rtl_info (current_function_decl
)->preferred_incoming_stack_boundary
3637 /* Make sure volatile mem refs aren't considered valid operands for
3638 arithmetic insns. We must call this here if this is a nested inline
3639 function, since the above code leaves us in the init_recog state
3640 (from final.c), and the function context push/pop code does not
3641 save/restore volatile_ok.
3643 ??? Maybe it isn't necessary for expand_start_function to call this
3644 anymore if we do it here? */
3646 init_recog_no_volatile ();
3648 /* We're done with this function. Free up memory if we can. */
3649 free_after_parsing (cfun
);
3650 if (! DECL_DEFER_OUTPUT (decl
))
3652 free_after_compilation (cfun
);
3653 DECL_SAVED_INSNS (decl
) = 0;
3659 timevar_pop (TV_REST_OF_COMPILATION
);
3662 /* Display help for target options. */
3664 display_target_options (void)
3667 static bool displayed
= false;
3669 /* Avoid double printing for --help --target-help. */
3675 if (ARRAY_SIZE (target_switches
) > 1
3676 #ifdef TARGET_OPTIONS
3677 || ARRAY_SIZE (target_options
) > 1
3685 printf (_("\nTarget specific options:\n"));
3687 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3689 const char *option
= target_switches
[i
].name
;
3690 const char *description
= target_switches
[i
].description
;
3692 if (option
== NULL
|| *option
== 0)
3694 else if (description
== NULL
)
3699 printf (_(" -m%-23s [undocumented]\n"), option
);
3701 else if (*description
!= 0)
3702 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
3705 #ifdef TARGET_OPTIONS
3706 for (i
= ARRAY_SIZE (target_options
); i
--;)
3708 const char *option
= target_options
[i
].prefix
;
3709 const char *description
= target_options
[i
].description
;
3711 if (option
== NULL
|| *option
== 0)
3713 else if (description
== NULL
)
3718 printf (_(" -m%-23s [undocumented]\n"), option
);
3720 else if (*description
!= 0)
3721 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
3727 printf (_("\nThere are undocumented target specific options as well.\n"));
3729 printf (_(" They exist, but they are not documented.\n"));
3734 /* Parse a -d... command line switch. */
3737 decode_d_option (const char *arg
)
3745 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3746 dump_file
[i
].enabled
= 1;
3752 flag_print_asm_name
= 1;
3755 flag_dump_rtl_in_asm
= 1;
3756 flag_print_asm_name
= 1;
3759 graph_dump_format
= vcg
;
3762 rtl_dump_and_exit
= 1;
3767 case 'D': /* These are handled by the preprocessor. */
3771 setup_core_dumping();
3776 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3777 if (c
== dump_file
[i
].debug_switch
)
3779 dump_file
[i
].enabled
= 1;
3784 warning ("unrecognized gcc debugging option: %c", c
);
3789 /* Indexed by enum debug_info_type. */
3790 const char *const debug_type_names
[] =
3792 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3795 /* Decode -m switches. */
3796 /* Decode the switch -mNAME. */
3799 set_target_switch (const char *name
)
3802 int valid_target_option
= 0;
3804 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
3805 if (!strcmp (target_switches
[j
].name
, name
))
3807 if (target_switches
[j
].value
< 0)
3808 target_flags
&= ~-target_switches
[j
].value
;
3810 target_flags
|= target_switches
[j
].value
;
3813 if (target_switches
[j
].value
< 0)
3814 target_flags_explicit
|= -target_switches
[j
].value
;
3816 target_flags_explicit
|= target_switches
[j
].value
;
3818 valid_target_option
= 1;
3821 #ifdef TARGET_OPTIONS
3822 if (!valid_target_option
)
3823 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
3825 int len
= strlen (target_options
[j
].prefix
);
3826 if (target_options
[j
].value
)
3828 if (!strcmp (target_options
[j
].prefix
, name
))
3830 *target_options
[j
].variable
= target_options
[j
].value
;
3831 valid_target_option
= 1;
3836 if (!strncmp (target_options
[j
].prefix
, name
, len
))
3838 *target_options
[j
].variable
= name
+ len
;
3839 valid_target_option
= 1;
3845 if (!valid_target_option
)
3846 error ("invalid option `%s'", name
);
3849 /* Print version information to FILE.
3850 Each line begins with INDENT (for the case where FILE is the
3851 assembler output file). */
3854 print_version (FILE *file
, const char *indent
)
3857 #define __VERSION__ "[?]"
3861 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3863 "%s%s%s version %s (%s) compiled by CC.\n"
3865 , indent
, *indent
!= 0 ? " " : "",
3866 lang_hooks
.name
, version_string
, TARGET_NAME
,
3867 indent
, __VERSION__
);
3868 fnotice (file
, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3869 indent
, *indent
!= 0 ? " " : "",
3870 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
3873 /* Print an option value and return the adjusted position in the line.
3874 ??? We don't handle error returns from fprintf (disk full); presumably
3875 other code will catch a disk full though. */
3878 print_single_switch (FILE *file
, int pos
, int max
,
3879 const char *indent
, const char *sep
, const char *term
,
3880 const char *type
, const char *name
)
3882 /* The ultrix fprintf returns 0 on success, so compute the result we want
3883 here since we need it for the following test. */
3884 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
3889 fprintf (file
, "%s", term
);
3894 fprintf (file
, "%s", indent
);
3895 pos
= strlen (indent
);
3897 fprintf (file
, "%s%s%s", sep
, type
, name
);
3902 /* Print active target switches to FILE.
3903 POS is the current cursor position and MAX is the size of a "line".
3904 Each line begins with INDENT and ends with TERM.
3905 Each switch is separated from the next by SEP. */
3908 print_switch_values (FILE *file
, int pos
, int max
,
3909 const char *indent
, const char *sep
, const char *term
)
3914 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3915 that it can be printed below. This helps reproducibility. */
3918 /* Print the options as passed. */
3919 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
3920 _("options passed: "), "");
3922 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
3926 if (strcmp (*p
, "-o") == 0)
3932 if (strcmp (*p
, "-quiet") == 0)
3934 if (strcmp (*p
, "-version") == 0)
3939 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
3942 fprintf (file
, "%s", term
);
3944 /* Print the -f and -m options that have been enabled.
3945 We don't handle language specific options but printing argv
3948 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
3949 _("options enabled: "), "");
3951 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
3952 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
3953 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
3954 "-f", f_options
[j
].string
);
3956 /* Print target specific options. */
3958 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
3959 if (target_switches
[j
].name
[0] != '\0'
3960 && target_switches
[j
].value
> 0
3961 && ((target_switches
[j
].value
& target_flags
)
3962 == target_switches
[j
].value
))
3964 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
3965 "-m", target_switches
[j
].name
);
3968 #ifdef TARGET_OPTIONS
3969 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
3970 if (*target_options
[j
].variable
!= NULL
)
3973 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
3974 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
3975 prefix
, *target_options
[j
].variable
);
3979 fprintf (file
, "%s", term
);
3982 /* Open assembly code output file. Do this even if -fsyntax-only is
3983 on, because then the driver will have provided the name of a
3984 temporary file or bit bucket for us. NAME is the file specified on
3985 the command line, possibly NULL. */
3987 init_asm_output (const char *name
)
3989 if (name
== NULL
&& asm_file_name
== 0)
3990 asm_out_file
= stdout
;
3993 if (asm_file_name
== 0)
3995 int len
= strlen (dump_base_name
);
3996 char *dumpname
= xmalloc (len
+ 6);
3997 memcpy (dumpname
, dump_base_name
, len
+ 1);
3998 strip_off_ending (dumpname
, len
);
3999 strcat (dumpname
, ".s");
4000 asm_file_name
= dumpname
;
4002 if (!strcmp (asm_file_name
, "-"))
4003 asm_out_file
= stdout
;
4005 asm_out_file
= fopen (asm_file_name
, "w+");
4006 if (asm_out_file
== 0)
4007 fatal_error ("can't open %s for writing: %m", asm_file_name
);
4010 #ifdef IO_BUFFER_SIZE
4011 setvbuf (asm_out_file
, xmalloc (IO_BUFFER_SIZE
),
4012 _IOFBF
, IO_BUFFER_SIZE
);
4015 if (!flag_syntax_only
)
4017 targetm
.asm_out
.file_start ();
4019 #ifdef ASM_COMMENT_START
4020 if (flag_verbose_asm
)
4022 /* Print the list of options in effect. */
4023 print_version (asm_out_file
, ASM_COMMENT_START
);
4024 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4025 ASM_COMMENT_START
, " ", "\n");
4026 /* Add a blank line here so it appears in assembler output but not
4028 fprintf (asm_out_file
, "\n");
4034 /* Default version of get_pch_validity.
4035 By default, every flag difference is fatal; that will be mostly right for
4036 most targets, but completely right for very few. */
4039 default_get_pch_validity (size_t *len
)
4041 #ifdef TARGET_OPTIONS
4046 *len
= sizeof (target_flags
) + 2;
4047 #ifdef TARGET_OPTIONS
4048 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
4051 if (*target_options
[i
].variable
)
4052 *len
+= strlen (*target_options
[i
].variable
);
4056 result
= r
= xmalloc (*len
);
4060 memcpy (r
, &target_flags
, sizeof (target_flags
));
4061 r
+= sizeof (target_flags
);
4063 #ifdef TARGET_OPTIONS
4064 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
4066 const char *str
= *target_options
[i
].variable
;
4070 l
= strlen (str
) + 1;
4079 /* Default version of pch_valid_p. */
4082 default_pch_valid_p (const void *data_p
, size_t len
)
4084 const char *data
= (const char *)data_p
;
4085 const char *flag_that_differs
= NULL
;
4088 /* -fpic and -fpie also usually make a PCH invalid. */
4089 if (data
[0] != flag_pic
)
4090 return _("created and used with different settings of -fpic");
4091 if (data
[1] != flag_pie
)
4092 return _("created and used with different settings of -fpie");
4095 /* Check target_flags. */
4096 if (memcmp (data
, &target_flags
, sizeof (target_flags
)) != 0)
4098 for (i
= 0; i
< ARRAY_SIZE (target_switches
); i
++)
4103 memcpy (&tf
, data
, sizeof (target_flags
));
4105 bits
= target_switches
[i
].value
;
4108 if ((target_flags
& bits
) != (tf
& bits
))
4110 flag_that_differs
= target_switches
[i
].name
;
4116 data
+= sizeof (target_flags
);
4117 len
-= sizeof (target_flags
);
4119 /* Check string options. */
4120 #ifdef TARGET_OPTIONS
4121 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
4123 const char *str
= *target_options
[i
].variable
;
4127 l
= strlen (str
) + 1;
4128 if (len
< l
|| memcmp (data
, str
, l
) != 0)
4130 flag_that_differs
= target_options
[i
].prefix
;
4143 asprintf (&r
, _("created and used with differing settings of `-m%s'"),
4146 return _("out of memory");
4151 /* Default tree printer. Handles declarations only. */
4153 default_tree_printer (pretty_printer
* pp
, text_info
*text
)
4155 switch (*text
->format_spec
)
4161 tree t
= va_arg (*text
->args_ptr
, tree
);
4162 const char *n
= DECL_NAME (t
)
4163 ? (*lang_hooks
.decl_printable_name
) (t
, 2)
4174 /* Initialization of the front end environment, before command line
4175 options are parsed. Signal handlers, internationalization etc.
4176 ARGV0 is main's argv[0]. */
4178 general_init (const char *argv0
)
4182 p
= argv0
+ strlen (argv0
);
4183 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4187 xmalloc_set_program_name (progname
);
4191 gcc_init_libintl ();
4193 /* Initialize the diagnostics reporting machinery, so option parsing
4194 can give warnings and errors. */
4195 diagnostic_initialize (global_dc
);
4196 /* Set a default printer. Language specific initializations will
4197 override it later. */
4198 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
4200 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4202 signal (SIGSEGV
, crash_signal
);
4205 signal (SIGILL
, crash_signal
);
4208 signal (SIGBUS
, crash_signal
);
4211 signal (SIGABRT
, crash_signal
);
4213 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4214 signal (SIGIOT
, crash_signal
);
4217 signal (SIGFPE
, crash_signal
);
4220 /* Other host-specific signal setup. */
4221 (*host_hooks
.extra_signals
)();
4223 /* Initialize the garbage-collector, string pools and tree type hash
4227 linemap_init (&line_table
);
4230 /* Initialize register usage now so switches may override. */
4233 /* Register the language-independent parameters. */
4234 add_params (lang_independent_params
, LAST_PARAM
);
4236 /* This must be done after add_params but before argument processing. */
4237 init_ggc_heuristics();
4240 /* Process the options that have been parsed. */
4242 process_options (void)
4244 /* Allow the front end to perform consistency checks and do further
4245 initialization based on the command line options. This hook also
4246 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4247 so we can correctly initialize debug output. */
4248 no_backend
= (*lang_hooks
.post_options
) (&main_input_filename
);
4249 input_filename
= main_input_filename
;
4251 #ifdef OVERRIDE_OPTIONS
4252 /* Some machines may reject certain combinations of options. */
4256 /* Set aux_base_name if not already set. */
4259 else if (main_input_filename
)
4261 char *name
= xstrdup (lbasename (main_input_filename
));
4263 strip_off_ending (name
, strlen (name
));
4264 aux_base_name
= name
;
4267 aux_base_name
= "gccaux";
4269 /* Set up the align_*_log variables, defaulting them to 1 if they
4270 were still unset. */
4271 if (align_loops
<= 0) align_loops
= 1;
4272 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4273 align_loops_max_skip
= align_loops
- 1;
4274 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4275 if (align_jumps
<= 0) align_jumps
= 1;
4276 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4277 align_jumps_max_skip
= align_jumps
- 1;
4278 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4279 if (align_labels
<= 0) align_labels
= 1;
4280 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4281 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4282 align_labels_max_skip
= align_labels
- 1;
4283 if (align_functions
<= 0) align_functions
= 1;
4284 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4286 /* Unrolling all loops implies that standard loop unrolling must also
4288 if (flag_unroll_all_loops
)
4289 flag_unroll_loops
= 1;
4291 if (flag_unroll_loops
)
4293 flag_old_unroll_loops
= 0;
4294 flag_old_unroll_all_loops
= 0;
4297 if (flag_old_unroll_all_loops
)
4298 flag_old_unroll_loops
= 1;
4300 /* Old loop unrolling requires that strength_reduction be on also. Silently
4301 turn on strength reduction here if it isn't already on. Also, the loop
4302 unrolling code assumes that cse will be run after loop, so that must
4303 be turned on also. */
4304 if (flag_old_unroll_loops
)
4306 flag_strength_reduce
= 1;
4307 flag_rerun_cse_after_loop
= 1;
4309 if (flag_unroll_loops
|| flag_peel_loops
)
4310 flag_rerun_cse_after_loop
= 1;
4312 if (flag_non_call_exceptions
)
4313 flag_asynchronous_unwind_tables
= 1;
4314 if (flag_asynchronous_unwind_tables
)
4315 flag_unwind_tables
= 1;
4317 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4319 if (flag_unit_at_a_time
&& ! lang_hooks
.callgraph
.expand_function
)
4320 flag_unit_at_a_time
= 0;
4322 if (flag_value_profile_transformations
)
4323 flag_profile_values
= 1;
4325 /* Warn about options that are not supported on this machine. */
4326 #ifndef INSN_SCHEDULING
4327 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4328 warning ("instruction scheduling not supported on this target machine");
4331 if (flag_delayed_branch
)
4332 warning ("this target machine does not have delayed branches");
4335 user_label_prefix
= USER_LABEL_PREFIX
;
4336 if (flag_leading_underscore
!= -1)
4338 /* If the default prefix is more complicated than "" or "_",
4339 issue a warning and ignore this option. */
4340 if (user_label_prefix
[0] == 0 ||
4341 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4343 user_label_prefix
= flag_leading_underscore
? "_" : "";
4346 warning ("-f%sleading-underscore not supported on this target machine",
4347 flag_leading_underscore
? "" : "no-");
4350 /* If we are in verbose mode, write out the version and maybe all the
4351 option flags in use. */
4354 print_version (stderr
, "");
4356 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4359 if (flag_syntax_only
)
4361 write_symbols
= NO_DEBUG
;
4365 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4367 if (debug_info_level
== DINFO_LEVEL_NONE
)
4368 write_symbols
= NO_DEBUG
;
4370 /* Now we know write_symbols, set up the debug hooks based on it.
4371 By default we do nothing for debug output. */
4372 if (write_symbols
== NO_DEBUG
)
4373 debug_hooks
= &do_nothing_debug_hooks
;
4374 #if defined(DBX_DEBUGGING_INFO)
4375 else if (write_symbols
== DBX_DEBUG
)
4376 debug_hooks
= &dbx_debug_hooks
;
4378 #if defined(XCOFF_DEBUGGING_INFO)
4379 else if (write_symbols
== XCOFF_DEBUG
)
4380 debug_hooks
= &xcoff_debug_hooks
;
4382 #ifdef SDB_DEBUGGING_INFO
4383 else if (write_symbols
== SDB_DEBUG
)
4384 debug_hooks
= &sdb_debug_hooks
;
4386 #ifdef DWARF2_DEBUGGING_INFO
4387 else if (write_symbols
== DWARF2_DEBUG
)
4388 debug_hooks
= &dwarf2_debug_hooks
;
4390 #ifdef VMS_DEBUGGING_INFO
4391 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4392 debug_hooks
= &vmsdbg_debug_hooks
;
4395 error ("target system does not support the \"%s\" debug format",
4396 debug_type_names
[write_symbols
]);
4398 /* Now we know which debug output will be used so we can set
4399 flag_var_tracking if user has not specified it. */
4400 if (flag_var_tracking
== AUTODETECT_FLAG_VAR_TRACKING
)
4402 /* User has not specified -f(no-)var-tracking so autodetect it. */
4404 = (optimize
>= 1 && debug_info_level
>= DINFO_LEVEL_NORMAL
4405 && debug_hooks
->var_location
!= do_nothing_debug_hooks
.var_location
);
4408 /* If auxiliary info generation is desired, open the output file.
4409 This goes in the same directory as the source file--unlike
4410 all the other output files. */
4411 if (flag_gen_aux_info
)
4413 aux_info_file
= fopen (aux_info_file_name
, "w");
4414 if (aux_info_file
== 0)
4415 fatal_error ("can't open %s: %m", aux_info_file_name
);
4418 if (! targetm
.have_named_sections
)
4420 if (flag_function_sections
)
4422 warning ("-ffunction-sections not supported for this target");
4423 flag_function_sections
= 0;
4425 if (flag_data_sections
)
4427 warning ("-fdata-sections not supported for this target");
4428 flag_data_sections
= 0;
4432 if (flag_function_sections
&& profile_flag
)
4434 warning ("-ffunction-sections disabled; it makes profiling impossible");
4435 flag_function_sections
= 0;
4438 #ifndef HAVE_prefetch
4439 if (flag_prefetch_loop_arrays
)
4441 warning ("-fprefetch-loop-arrays not supported for this target");
4442 flag_prefetch_loop_arrays
= 0;
4445 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
4447 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4448 flag_prefetch_loop_arrays
= 0;
4452 /* This combination of options isn't handled for i386 targets and doesn't
4453 make much sense anyway, so don't allow it. */
4454 if (flag_prefetch_loop_arrays
&& optimize_size
)
4456 warning ("-fprefetch-loop-arrays is not supported with -Os");
4457 flag_prefetch_loop_arrays
= 0;
4460 #ifndef OBJECT_FORMAT_ELF
4461 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
4462 warning ("-ffunction-sections may affect debugging on some targets");
4465 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4466 if (flag_signaling_nans
)
4467 flag_trapping_math
= 1;
4470 /* Initialize the compiler back end. */
4474 init_adjust_machine_modes ();
4476 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
4477 || debug_info_level
== DINFO_LEVEL_VERBOSE
4478 #ifdef VMS_DEBUGGING_INFO
4479 /* Enable line number info for traceback. */
4480 || debug_info_level
> DINFO_LEVEL_NONE
4482 || flag_test_coverage
4483 || warn_notreached
);
4486 init_fake_stack_mems ();
4490 init_function_once ();
4491 init_varasm_once ();
4493 /* The following initialization functions need to generate rtl, so
4494 provide a dummy function context for them. */
4495 init_dummy_function_start ();
4497 if (flag_caller_saves
)
4498 init_caller_save ();
4499 expand_dummy_function_end ();
4502 /* Language-dependent initialization. Returns nonzero on success. */
4504 lang_dependent_init (const char *name
)
4506 if (dump_base_name
== 0)
4507 dump_base_name
= name
? name
: "gccdump";
4509 /* Other front-end initialization. */
4510 if ((*lang_hooks
.init
) () == 0)
4513 init_asm_output (name
);
4515 /* These create various _DECL nodes, so need to be called after the
4516 front end is initialized. */
4520 /* The following initialization functions need to generate rtl, so
4521 provide a dummy function context for them. */
4522 init_dummy_function_start ();
4524 expand_dummy_function_end ();
4526 /* If dbx symbol table desired, initialize writing it and output the
4527 predefined types. */
4528 timevar_push (TV_SYMOUT
);
4530 #ifdef DWARF2_UNWIND_INFO
4531 if (dwarf2out_do_frame ())
4532 dwarf2out_frame_init ();
4535 /* Now we have the correct original filename, we can initialize
4537 (*debug_hooks
->init
) (name
);
4539 timevar_pop (TV_SYMOUT
);
4544 /* Clean up: close opened files, etc. */
4549 /* Close the dump files. */
4550 if (flag_gen_aux_info
)
4552 fclose (aux_info_file
);
4554 unlink (aux_info_file_name
);
4557 /* Close non-debugging input and output files. Take special care to note
4558 whether fclose returns an error, since the pages might still be on the
4559 buffer chain while the file is open. */
4563 if (ferror (asm_out_file
) != 0)
4564 fatal_error ("error writing to %s: %m", asm_file_name
);
4565 if (fclose (asm_out_file
) != 0)
4566 fatal_error ("error closing %s: %m", asm_file_name
);
4569 /* Do whatever is necessary to finish printing the graphs. */
4570 if (graph_dump_format
!= no_graph
)
4574 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4575 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
4580 sprintf (seq
, DUMPFILE_FORMAT
, i
);
4581 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
4582 finish_graph_dump_file (dump_base_name
, suffix
);
4589 ggc_print_statistics ();
4590 stringpool_statistics ();
4591 dump_tree_statistics ();
4592 dump_rtx_statistics ();
4593 dump_varray_statistics ();
4594 dump_alloc_pool_statistics ();
4597 /* Free up memory for the benefit of leak detectors. */
4600 /* Language-specific end of compilation actions. */
4601 (*lang_hooks
.finish
) ();
4604 /* Initialize the compiler, and compile the input file. */
4608 /* Initialize timing first. The C front ends read the main file in
4609 the post_options hook, and C++ does file timings. */
4610 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
4612 timevar_start (TV_TOTAL
);
4616 /* Don't do any more if an error has already occurred. */
4619 /* Set up the back-end if requested. */
4623 /* Language-dependent initialization. Returns true on success. */
4624 if (lang_dependent_init (main_input_filename
))
4626 if (flag_unit_at_a_time
)
4628 open_dump_file (DFI_cgraph
, NULL
);
4629 cgraph_dump_file
= rtl_dump_file
;
4630 rtl_dump_file
= NULL
;
4635 if (flag_unit_at_a_time
)
4637 rtl_dump_file
= cgraph_dump_file
;
4638 cgraph_dump_file
= NULL
;
4639 close_dump_file (DFI_cgraph
, NULL
, NULL_RTX
);
4646 /* Stop timing and print the times. */
4647 timevar_stop (TV_TOTAL
);
4648 timevar_print (stderr
);
4651 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4652 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4653 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4655 It is not safe to call this function more than once. */
4658 toplev_main (unsigned int argc
, const char **argv
)
4662 /* Initialization of GCC's environment, and diagnostics. */
4663 general_init (argv
[0]);
4665 /* Parse the options and do minimal processing; basically just
4666 enough to default flags appropriately. */
4667 decode_options (argc
, argv
);
4671 /* Exit early if we can (e.g. -help). */
4672 if (!exit_after_options
)
4675 if (errorcount
|| sorrycount
)
4676 return (FATAL_EXIT_CODE
);
4678 return (SUCCESS_EXIT_CODE
);