1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 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"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
80 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
81 #include "dwarf2out.h"
84 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
88 #ifdef SDB_DEBUGGING_INFO
92 #ifdef XCOFF_DEBUGGING_INFO
93 #include "xcoffout.h" /* Needed for external data
94 declarations for e.g. AIX 4.x. */
97 /* Carry information from ASM_DECLARE_OBJECT_NAME
98 to ASM_FINISH_DECLARE_OBJECT. */
100 extern int size_directive_output
;
101 extern tree last_assemble_variable_decl
;
103 extern void reg_alloc (void);
105 static void general_init (char *);
106 static void parse_options_and_default_flags (int, char **);
107 static void do_compile (void);
108 static void process_options (void);
109 static void backend_init (void);
110 static int lang_dependent_init (const char *);
111 static void init_asm_output (const char *);
112 static void finalize (void);
114 static void set_target_switch (const char *);
116 static void crash_signal (int) ATTRIBUTE_NORETURN
;
117 static void setup_core_dumping (void);
118 static void compile_file (void);
119 static void display_help (void);
120 static void display_target_options (void);
122 static void decode_d_option (const char *);
123 static int decode_f_option (const char *);
124 static int decode_W_option (const char *);
125 static int decode_g_option (const char *);
126 static unsigned int independent_decode_option (int, char **);
127 static void set_Wextra (int);
129 static void print_version (FILE *, const char *);
130 static int print_single_switch (FILE *, int, int, const char *,
131 const char *, const char *,
132 const char *, const char *);
133 static void print_switch_values (FILE *, int, int, const char *,
134 const char *, const char *);
136 /* Rest of compilation helper functions. */
137 static bool rest_of_handle_inlining (tree
);
138 static rtx
rest_of_handle_ssa (tree
, rtx
);
139 static void rest_of_handle_cse (tree
, rtx
);
140 static void rest_of_handle_cse2 (tree
, rtx
);
141 static void rest_of_handle_gcse (tree
, rtx
);
142 static void rest_of_handle_life (tree
, rtx
);
143 static void rest_of_handle_loop_optimize (tree
, rtx
);
144 static void rest_of_handle_loop2 (tree
, rtx
);
145 static void rest_of_handle_jump_bypass (tree
, rtx
);
146 static void rest_of_handle_sibling_calls (rtx
);
147 static void rest_of_handle_null_pointer (tree
, rtx
);
148 static void rest_of_handle_addresof (tree
, rtx
);
149 static void rest_of_handle_cfg (tree
, rtx
);
150 static void rest_of_handle_branch_prob (tree
, rtx
);
151 static void rest_of_handle_if_conversion (tree
, rtx
);
152 static void rest_of_handle_if_after_combine (tree
, rtx
);
153 static void rest_of_handle_tracer (tree
, rtx
);
154 static void rest_of_handle_combine (tree
, rtx
);
155 static void rest_of_handle_regmove (tree
, rtx
);
156 static void rest_of_handle_sched (tree
, rtx
);
157 #ifdef INSN_SCHEDULING
158 static void rest_of_handle_sched2 (tree
, rtx
);
160 static bool rest_of_handle_new_regalloc (tree
, rtx
, int *);
161 static bool rest_of_handle_old_regalloc (tree
, rtx
, int *);
162 static void rest_of_handle_regrename (tree
, rtx
);
163 static void rest_of_handle_reorder_blocks (tree
, rtx
);
165 static void rest_of_handle_stack_regs (tree
, rtx
);
167 static void rest_of_handle_machine_reorg (tree
, rtx
);
169 static void rest_of_handle_delay_slots (tree
, rtx
);
171 static void rest_of_handle_final (tree
, rtx
);
173 /* Nonzero to dump debug info whilst parsing (-dy option). */
174 static int set_yydebug
;
176 /* True if we don't need a backend (e.g. preprocessing only). */
177 static bool no_backend
;
179 /* Length of line when printing switch values. */
182 /* Name of program invoked, sans directories. */
184 const char *progname
;
186 /* Copy of arguments to toplev_main. */
190 /* Name of top-level original source file (what was input to cpp).
191 This comes from the #-command at the beginning of the actual input.
192 If there isn't any there, then this is the cc1 input file name. */
194 const char *main_input_filename
;
196 /* Current position in real source file. */
198 location_t input_location
;
200 /* Nonzero if it is unsafe to create any new pseudo registers. */
203 /* Stack of currently pending input files. */
205 struct file_stack
*input_file_stack
;
207 /* Incremented on each change to input_file_stack. */
208 int input_file_stack_tick
;
210 /* Name to use as base of names for dump output files. */
212 const char *dump_base_name
;
214 /* Name to use as a base for auxiliary output files. */
216 static const char *aux_base_name
;
218 /* Format to use to print dumpfile index value */
219 #ifndef DUMPFILE_FORMAT
220 #define DUMPFILE_FORMAT ".%02d."
223 /* Bit flags that specify the machine subtype we are compiling for.
224 Bits are tested using macros TARGET_... defined in the tm.h file
225 and set by `-m...' switches. Must be defined in rtlanal.c. */
227 extern int target_flags
;
229 /* A mask of target_flags that includes bit X if X was set or cleared
230 on the command line. */
232 int target_flags_explicit
;
234 /* Debug hooks - dependent upon command line options. */
236 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
238 /* Describes a dump file. */
240 struct dump_file_info
242 /* The unique extension to apply, e.g. ".jump". */
243 const char *const extension
;
245 /* The -d<c> character that enables this dump file. */
246 char const debug_switch
;
248 /* True if there is a corresponding graph dump file. */
249 char const graph_dump_p
;
251 /* True if the user selected this dump. */
254 /* True if the files have been initialized (ie truncated). */
258 /* Enumerate the extant dump files. */
302 /* Describes all the dump files. Should be kept in order of the
303 pass and in sync with dump_file_index above.
305 Remaining -d letters:
311 static struct dump_file_info dump_file
[DFI_MAX
] =
313 { "rtl", 'r', 0, 0, 0 },
314 { "sibling", 'i', 0, 0, 0 },
315 { "eh", 'h', 0, 0, 0 },
316 { "jump", 'j', 0, 0, 0 },
317 { "ssa", 'e', 1, 0, 0 },
318 { "ssaccp", 'W', 1, 0, 0 },
319 { "ssadce", 'X', 1, 0, 0 },
320 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
321 { "null", 'u', 0, 0, 0 },
322 { "cse", 's', 0, 0, 0 },
323 { "addressof", 'F', 0, 0, 0 },
324 { "gcse", 'G', 1, 0, 0 },
325 { "loop", 'L', 1, 0, 0 },
326 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
327 { "cfg", 'f', 1, 0, 0 },
328 { "bp", 'b', 1, 0, 0 },
329 { "ce1", 'C', 1, 0, 0 },
330 { "tracer", 'T', 1, 0, 0 },
331 { "loop2", 'L', 1, 0, 0 },
332 { "cse2", 't', 1, 0, 0 },
333 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
334 { "combine", 'c', 1, 0, 0 },
335 { "ce2", 'C', 1, 0, 0 },
336 { "regmove", 'N', 1, 0, 0 },
337 { "sched", 'S', 1, 0, 0 },
338 { "lreg", 'l', 1, 0, 0 },
339 { "greg", 'g', 1, 0, 0 },
340 { "postreload", 'o', 1, 0, 0 },
341 { "flow2", 'w', 1, 0, 0 },
342 { "peephole2", 'z', 1, 0, 0 },
343 { "rnreg", 'n', 1, 0, 0 },
344 { "bbro", 'B', 1, 0, 0 },
345 { "ce3", 'E', 1, 0, 0 },
346 { "sched2", 'R', 1, 0, 0 },
347 { "stack", 'k', 1, 0, 0 },
348 { "mach", 'M', 1, 0, 0 },
349 { "dbr", 'd', 0, 0, 0 },
352 static int open_dump_file (enum dump_file_index
, tree
);
353 static void close_dump_file (enum dump_file_index
,
354 void (*) (FILE *, rtx
), rtx
);
356 /* Other flags saying which kinds of debugging dump have been requested. */
358 int rtl_dump_and_exit
;
359 int flag_print_asm_name
;
360 static int version_flag
;
361 static const char *filename
;
362 enum graph_dump_types graph_dump_format
;
364 /* Name for output file of assembly code, specified with -o. */
368 /* Value of the -G xx switch, and whether it was passed or not. */
369 unsigned HOST_WIDE_INT g_switch_value
;
372 /* Type(s) of debugging information we are producing (if any).
373 See flags.h for the definitions of the different possible
374 types of debugging information. */
375 enum debug_info_type write_symbols
= NO_DEBUG
;
377 /* Level of debugging information we are producing. See flags.h
378 for the definitions of the different possible levels. */
379 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
381 /* Nonzero means use GNU-only extensions in the generated symbolic
382 debugging information. */
383 /* Currently, this only has an effect when write_symbols is set to
384 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
385 int use_gnu_debug_info_extensions
= 0;
387 /* Nonzero means do optimizations. -O.
388 Particular numeric values stand for particular amounts of optimization;
389 thus, -O2 stores 2 here. However, the optimizations beyond the basic
390 ones are not controlled directly by this variable. Instead, they are
391 controlled by individual `flag_...' variables that are defaulted
392 based on this variable. */
396 /* Nonzero means optimize for size. -Os.
397 The only valid values are zero and nonzero. When optimize_size is
398 nonzero, optimize defaults to 2, but certain individual code
399 bloating optimizations are disabled. */
401 int optimize_size
= 0;
403 /* Nonzero if we should exit after parsing options. */
404 static int exit_after_options
= 0;
406 /* The FUNCTION_DECL for the function currently being compiled,
407 or 0 if between functions. */
408 tree current_function_decl
;
410 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
412 tree current_function_func_begin_label
;
414 /* Nonzero if doing dwarf2 duplicate elimination. */
416 int flag_eliminate_dwarf2_dups
= 0;
418 /* Nonzero if doing unused type elimination. */
420 int flag_eliminate_unused_debug_types
= 1;
422 /* Nonzero if generating code to do profiling. */
424 int profile_flag
= 0;
426 /* Nonzero if generating code to profile program flow graph arcs. */
428 int profile_arc_flag
= 0;
430 /* Nonzero if generating info for gcov to calculate line test coverage. */
432 int flag_test_coverage
= 0;
434 /* Nonzero indicates that branch taken probabilities should be calculated. */
436 int flag_branch_probabilities
= 0;
438 /* Nonzero if basic blocks should be reordered. */
440 int flag_reorder_blocks
= 0;
442 /* Nonzero if functions should be reordered. */
444 int flag_reorder_functions
= 0;
446 /* Nonzero if registers should be renamed. */
448 int flag_rename_registers
= 0;
449 int flag_cprop_registers
= 0;
451 /* Nonzero for -pedantic switch: warn about anything
452 that standard spec forbids. */
456 /* Temporarily suppress certain warnings.
457 This is set while reading code from a system header file. */
459 int in_system_header
= 0;
461 /* Don't print functions as they are compiled. -quiet. */
465 /* Print times taken by the various passes. -ftime-report. */
467 static int time_report
= 0;
469 /* Print memory still in use at end of compilation (which may have little
470 to do with peak memory consumption). -fmem-report. */
474 /* Nonzero means to collect statistics which might be expensive
475 and to print them when we are done. */
476 int flag_detailed_statistics
= 0;
480 /* Nonzero means `char' should be signed. */
482 int flag_signed_char
;
484 /* Nonzero means give an enum type only as many bytes as it needs. */
486 int flag_short_enums
;
488 /* Nonzero for -fcaller-saves: allocate values in regs that need to
489 be saved across function calls, if that produces overall better code.
490 Optional now, so people can test it. */
492 #ifdef DEFAULT_CALLER_SAVES
493 int flag_caller_saves
= 1;
495 int flag_caller_saves
= 0;
498 /* Nonzero if structures and unions should be returned in memory.
500 This should only be defined if compatibility with another compiler or
501 with an ABI is needed, because it results in slower code. */
503 #ifndef DEFAULT_PCC_STRUCT_RETURN
504 #define DEFAULT_PCC_STRUCT_RETURN 1
507 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
509 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
511 /* Nonzero for -fforce-mem: load memory value into a register
512 before arithmetic on it. This makes better cse but slower compilation. */
514 int flag_force_mem
= 0;
516 /* Nonzero for -fforce-addr: load memory address into a register before
517 reference to memory. This makes better cse but slower compilation. */
519 int flag_force_addr
= 0;
521 /* Nonzero for -fdefer-pop: don't pop args after each function call;
522 instead save them up to pop many calls' args with one insns. */
524 int flag_defer_pop
= 0;
526 /* Nonzero for -ffloat-store: don't allocate floats and doubles
527 in extended-precision registers. */
529 int flag_float_store
= 0;
531 /* Nonzero for -fcse-follow-jumps:
532 have cse follow jumps to do a more extensive job. */
534 int flag_cse_follow_jumps
;
536 /* Nonzero for -fcse-skip-blocks:
537 have cse follow a branch around a block. */
538 int flag_cse_skip_blocks
;
540 /* Nonzero for -fexpensive-optimizations:
541 perform miscellaneous relatively-expensive optimizations. */
542 int flag_expensive_optimizations
;
544 /* Nonzero for -fthread-jumps:
545 have jump optimize output of loop. */
547 int flag_thread_jumps
;
549 /* Nonzero enables strength-reduction in loop.c. */
551 int flag_strength_reduce
= 0;
553 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
554 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
555 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
558 int flag_old_unroll_loops
;
560 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
561 This is generally not a win. */
563 int flag_old_unroll_all_loops
;
565 /* Enables unrolling of simple loops in loop-unroll.c. */
566 int flag_unroll_loops
;
568 /* Enables unrolling of all loops in loop-unroll.c. */
569 int flag_unroll_all_loops
;
571 /* Nonzero enables loop peeling. */
574 /* Nonzero enables loop unswitching. */
575 int flag_unswitch_loops
;
577 /* Nonzero enables prefetch optimizations for arrays in loops. */
579 int flag_prefetch_loop_arrays
;
581 /* Nonzero forces all invariant computations in loops to be moved
584 int flag_move_all_movables
= 0;
586 /* Nonzero forces all general induction variables in loops to be
589 int flag_reduce_all_givs
= 0;
591 /* Nonzero to perform full register move optimization passes. This is the
594 int flag_regmove
= 0;
596 /* Nonzero for -fwritable-strings:
597 store string constants in data segment and don't uniquize them. */
599 int flag_writable_strings
= 0;
601 /* Nonzero means don't put addresses of constant functions in registers.
602 Used for compiling the Unix kernel, where strange substitutions are
603 done on the assembly output. */
605 int flag_no_function_cse
= 0;
607 /* Nonzero for -fomit-frame-pointer:
608 don't make a frame pointer in simple functions that don't require one. */
610 int flag_omit_frame_pointer
= 0;
612 /* Nonzero means place each function into its own section on those platforms
613 which support arbitrary section names and unlimited numbers of sections. */
615 int flag_function_sections
= 0;
617 /* ... and similar for data. */
619 int flag_data_sections
= 0;
621 /* Nonzero to inhibit use of define_optimization peephole opts. */
623 int flag_no_peephole
= 0;
625 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
627 int flag_optimize_sibling_calls
= 0;
629 /* Nonzero means the front end generally wants `errno' maintained by math
630 operations, like built-in SQRT. */
632 int flag_errno_math
= 1;
634 /* Nonzero means that unsafe floating-point math optimizations are allowed
635 for the sake of speed. IEEE compliance is not guaranteed, and operations
636 are allowed to assume that their arguments and results are "normal"
637 (e.g., nonnegative for SQRT). */
639 int flag_unsafe_math_optimizations
= 0;
641 /* Nonzero means that no NaNs or +-Infs are expected. */
643 int flag_finite_math_only
= 0;
645 /* Zero means that floating-point math operations cannot generate a
646 (user-visible) trap. This is the case, for example, in nonstop
647 IEEE 754 arithmetic. Trapping conditions include division by zero,
648 overflow, underflow, invalid and inexact, but does not include
649 operations on signaling NaNs (see below). */
651 int flag_trapping_math
= 1;
653 /* Nonzero means disable transformations observable by signaling NaNs.
654 This option implies that any operation on a IEEE signaling NaN can
655 generate a (user-visible) trap. */
657 int flag_signaling_nans
= 0;
659 /* 0 means straightforward implementation of complex divide acceptable.
660 1 means wide ranges of inputs must work for complex divide.
661 2 means C99-like requirements for complex divide (not yet implemented). */
663 int flag_complex_divide_method
= 0;
665 /* Nonzero means just do syntax checking; don't output anything. */
667 int flag_syntax_only
= 0;
669 /* Nonzero means perform loop optimizer. */
671 static int flag_loop_optimize
;
673 /* Nonzero means perform crossjumping. */
675 static int flag_crossjumping
;
677 /* Nonzero means perform if conversion. */
679 static int flag_if_conversion
;
681 /* Nonzero means perform if conversion after reload. */
683 static int flag_if_conversion2
;
685 /* Nonzero means to use global dataflow analysis to eliminate
686 useless null pointer tests. */
688 static int flag_delete_null_pointer_checks
;
690 /* Nonzero means perform global CSE. */
694 /* Nonzero means to do the enhanced load motion during gcse, which trys
695 to hoist loads by not killing them when a store to the same location
698 int flag_gcse_lm
= 1;
700 /* Nonzero means to perform store motion after gcse, which will try to
701 move stores closer to the exit block. Its not very effective without
704 int flag_gcse_sm
= 1;
706 /* Nonzero means to rerun cse after loop optimization. This increases
707 compilation time about 20% and picks up a few more common expressions. */
709 static int flag_rerun_cse_after_loop
;
711 /* Nonzero means to run loop optimizations twice. */
713 int flag_rerun_loop_opt
;
715 /* Nonzero for -finline-functions: ok to inline functions that look like
716 good inline candidates. */
718 int flag_inline_functions
;
720 /* Nonzero for -fkeep-inline-functions: even if we make a function
721 go inline everywhere, keep its definition around for debugging
724 int flag_keep_inline_functions
;
726 /* Nonzero means that functions will not be inlined. */
728 int flag_no_inline
= 2;
730 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
731 not just because the tree inliner turned us off. */
733 int flag_really_no_inline
= 2;
735 /* Nonzero means that we should emit static const variables
736 regardless of whether or not optimization is turned on. */
738 int flag_keep_static_consts
= 1;
740 /* Nonzero means we should be saving declaration info into a .X file. */
742 int flag_gen_aux_info
= 0;
744 /* Specified name of aux-info file. */
746 static char *aux_info_file_name
;
748 /* Nonzero means make the text shared if supported. */
750 int flag_shared_data
;
752 /* Nonzero means schedule into delayed branch slots if supported. */
754 int flag_delayed_branch
;
756 /* Nonzero if we are compiling pure (sharable) code.
757 Value is 1 if we are doing "small" pic; value is 2 if we're doing
762 /* Nonzero if we are compiling position independent code for executable.
763 The value is 1 if we are doing "small" pic; value is 2 if we're doing
768 /* Nonzero if we are compiling code for a shared library, zero for
773 /* Set to the default thread-local storage (tls) model to use. */
775 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
777 /* Nonzero means generate extra code for exception handling and enable
778 exception handling. */
782 /* Nonzero means generate frame unwind info table when supported. */
784 int flag_unwind_tables
= 0;
786 /* Nonzero means generate frame unwind info table exact at each insn boundary */
788 int flag_asynchronous_unwind_tables
= 0;
790 /* Nonzero means don't place uninitialized global data in common storage
795 /* Nonzero means change certain warnings into errors.
796 Usually these are warnings about failure to conform to some standard. */
798 int flag_pedantic_errors
= 0;
800 /* flag_schedule_insns means schedule insns within basic blocks (before
802 flag_schedule_insns_after_reload means schedule insns after
805 int flag_schedule_insns
= 0;
806 int flag_schedule_insns_after_reload
= 0;
808 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
809 int flag_sched2_use_superblocks
= 0;
811 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
813 int flag_sched2_use_traces
= 0;
815 /* The following flags have effect only for scheduling before register
818 flag_schedule_interblock means schedule insns across basic blocks.
819 flag_schedule_speculative means allow speculative motion of non-load insns.
820 flag_schedule_speculative_load means allow speculative motion of some
822 flag_schedule_speculative_load_dangerous allows speculative motion of more
825 int flag_schedule_interblock
= 1;
826 int flag_schedule_speculative
= 1;
827 int flag_schedule_speculative_load
= 0;
828 int flag_schedule_speculative_load_dangerous
= 0;
830 int flag_single_precision_constant
;
832 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
833 by a cheaper branch on a count register. */
834 int flag_branch_on_count_reg
= 1;
836 /* -finhibit-size-directive inhibits output of .size for ELF.
837 This is used only for compiling crtstuff.c,
838 and it may be extended to other effects
839 needed for crtstuff.c on other systems. */
840 int flag_inhibit_size_directive
= 0;
842 /* -fverbose-asm causes extra commentary information to be produced in
843 the generated assembly code (to make it more readable). This option
844 is generally only of use to those who actually need to read the
845 generated assembly code (perhaps while debugging the compiler itself).
846 -fno-verbose-asm, the default, causes the extra information
847 to be omitted and is useful when comparing two assembler files. */
849 int flag_verbose_asm
= 0;
851 /* -dA causes debug commentary information to be produced in
852 the generated assembly code (to make it more readable). This option
853 is generally only of use to those who actually need to read the
854 generated assembly code (perhaps while debugging the compiler itself).
855 Currently, this switch is only used by dwarfout.c; however, it is intended
856 to be a catchall for printing debug information in the assembler file. */
858 int flag_debug_asm
= 0;
860 /* -dP causes the rtl to be emitted as a comment in assembly. */
862 int flag_dump_rtl_in_asm
= 0;
864 /* -fgnu-linker specifies use of the GNU linker for initializations.
865 (Or, more generally, a linker that handles initializations.)
866 -fno-gnu-linker says that collect2 will be used. */
868 int flag_gnu_linker
= 0;
870 int flag_gnu_linker
= 1;
873 /* Nonzero means put zero initialized data in the bss section. */
874 int flag_zero_initialized_in_bss
= 1;
879 /* Enable ssa conditional constant propagation. */
880 int flag_ssa_ccp
= 0;
882 /* Enable ssa aggressive dead code elimination. */
883 int flag_ssa_dce
= 0;
885 /* Tag all structures with __attribute__(packed). */
886 int flag_pack_struct
= 0;
888 /* Emit code to check for stack overflow; also may cause large objects
889 to be allocated dynamically. */
890 int flag_stack_check
;
892 /* When non-NULL, indicates that whenever space is allocated on the
893 stack, the resulting stack pointer must not pass this
894 address---that is, for stacks that grow downward, the stack pointer
895 must always be greater than or equal to this address; for stacks
896 that grow upward, the stack pointer must be less than this address.
897 At present, the rtx may be either a REG or a SYMBOL_REF, although
898 the support provided depends on the backend. */
901 /* 0 if pointer arguments may alias each other. True in C.
902 1 if pointer arguments may not alias each other but may alias
904 2 if pointer arguments may not alias each other and may not
905 alias global variables. True in Fortran.
906 This defaults to 0 for C. */
907 int flag_argument_noalias
= 0;
909 /* Nonzero if we should do (language-dependent) alias analysis.
910 Typically, this analysis will assume that expressions of certain
911 types do not alias expressions of certain other types. Only used
912 if alias analysis (in general) is enabled. */
913 int flag_strict_aliasing
= 0;
915 /* Instrument functions with calls at entry and exit, for profiling. */
916 int flag_instrument_function_entry_exit
= 0;
918 /* Nonzero means ignore `#ident' directives. 0 means handle them.
919 On SVR4 targets, it also controls whether or not to emit a
920 string identifying the compiler. */
922 int flag_no_ident
= 0;
924 /* This will perform a peephole pass before sched2. */
925 int flag_peephole2
= 0;
927 /* This will try to guess branch probabilities. */
928 int flag_guess_branch_prob
= 0;
930 /* -fcheck-bounds causes gcc to generate array bounds checks.
931 For C, C++, ObjC: defaults to off.
932 For Java: defaults to on.
933 For Fortran: defaults to off. */
934 int flag_bounds_check
= 0;
936 /* This will attempt to merge constant section constants, if 1 only
937 string constants and constants from constant pool, if 2 also constant
939 int flag_merge_constants
= 1;
941 /* If one, renumber instruction UIDs to reduce the number of
942 unused UIDs if there are a lot of instructions. If greater than
943 one, unconditionally renumber instruction UIDs. */
944 int flag_renumber_insns
= 1;
946 /* If nonzero, use the graph coloring register allocator. */
947 int flag_new_regalloc
= 0;
949 /* Nonzero if we perform superblock formation. */
953 /* Nonzero if we perform whole unit at a time compilation. */
955 int flag_unit_at_a_time
= 0;
957 /* Values of the -falign-* flags: how much to align labels in code.
958 0 means `use default', 1 means `don't align'.
959 For each variable, there is an _log variant which is the power
960 of two not less than the variable, for .align output. */
964 int align_loops_max_skip
;
967 int align_jumps_max_skip
;
969 int align_labels_log
;
970 int align_labels_max_skip
;
972 int align_functions_log
;
974 /* Like align_functions_log above, but used by front-ends to force the
975 minimum function alignment. Zero means no alignment is forced. */
976 int force_align_functions_log
;
978 /* Table of supported debugging formats. */
981 const char *const arg
;
982 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
983 constant expression, we use NO_DEBUG in its place. */
984 const enum debug_info_type debug_type
;
985 const int use_extensions_p
;
986 const char *const description
;
990 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
991 N_("Generate debugging info in default format") },
992 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
993 #ifdef DBX_DEBUGGING_INFO
994 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
995 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
997 #ifdef DWARF_DEBUGGING_INFO
998 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
999 { "dwarf+", DWARF_DEBUG
, 1,
1000 N_("Generate extended DWARF-1 format debug info") },
1002 #ifdef DWARF2_DEBUGGING_INFO
1003 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
1005 #ifdef XCOFF_DEBUGGING_INFO
1006 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
1007 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
1009 #ifdef SDB_DEBUGGING_INFO
1010 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
1012 #ifdef VMS_DEBUGGING_INFO
1013 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
1020 const char *const string
;
1021 int *const variable
;
1023 const char *const description
;
1025 lang_independent_options
;
1027 /* Nonzero if signed arithmetic overflow should trap. */
1030 /* Nonzero if signed arithmetic overflow should wrap around. */
1033 /* Add or remove a leading underscore from user symbols. */
1034 int flag_leading_underscore
= -1;
1036 /* The user symbol prefix after having resolved same. */
1037 const char *user_label_prefix
;
1039 static const param_info lang_independent_params
[] = {
1040 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1041 { OPTION, DEFAULT, HELP },
1042 #include "params.def"
1047 /* Table of language-independent -f options.
1048 STRING is the option name. VARIABLE is the address of the variable.
1049 ON_VALUE is the value to store in VARIABLE
1050 if `-fSTRING' is seen as an option.
1051 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1053 static const lang_independent_options f_options
[] =
1055 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
1056 N_("Perform DWARF2 duplicate elimination") },
1057 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types
, 1,
1058 N_("Perform unused type elimination in debug info") },
1059 {"float-store", &flag_float_store
, 1,
1060 N_("Do not store floats in registers") },
1061 {"defer-pop", &flag_defer_pop
, 1,
1062 N_("Defer popping functions args from stack until later") },
1063 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1064 N_("When possible do not generate stack frames") },
1065 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1066 N_("Optimize sibling and tail recursive calls") },
1067 {"tracer", &flag_tracer
, 1,
1068 N_("Perform superblock formation via tail duplication") },
1069 {"unit-at-a-time", &flag_unit_at_a_time
, 1,
1070 N_("Compile whole compilation unit at a time") },
1071 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1072 N_("When running CSE, follow jumps to their targets") },
1073 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1074 N_("When running CSE, follow conditional jumps") },
1075 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1076 N_("Perform a number of minor, expensive optimizations") },
1077 {"thread-jumps", &flag_thread_jumps
, 1,
1078 N_("Perform jump threading optimizations") },
1079 {"strength-reduce", &flag_strength_reduce
, 1,
1080 N_("Perform strength reduction optimizations") },
1081 {"unroll-loops", &flag_unroll_loops
, 1,
1082 N_("Perform loop unrolling when iteration count is known") },
1083 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1084 N_("Perform loop unrolling for all loops") },
1085 {"old-unroll-loops", &flag_old_unroll_loops
, 1,
1086 N_("Perform loop unrolling when iteration count is known") },
1087 {"old-unroll-all-loops", &flag_old_unroll_all_loops
, 1,
1088 N_("Perform loop unrolling for all loops") },
1089 {"peel-loops", &flag_peel_loops
, 1,
1090 N_("Perform loop peeling") },
1091 {"unswitch-loops", &flag_unswitch_loops
, 1,
1092 N_("Perform loop unswitching") },
1093 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
1094 N_("Generate prefetch instructions, if available, for arrays in loops") },
1095 {"move-all-movables", &flag_move_all_movables
, 1,
1096 N_("Force all loop invariant computations out of loops") },
1097 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1098 N_("Strength reduce all loop general induction variables") },
1099 {"writable-strings", &flag_writable_strings
, 1,
1100 N_("Store strings in writable data section") },
1101 {"peephole", &flag_no_peephole
, 0,
1102 N_("Enable machine specific peephole optimizations") },
1103 {"force-mem", &flag_force_mem
, 1,
1104 N_("Copy memory operands into registers before using") },
1105 {"force-addr", &flag_force_addr
, 1,
1106 N_("Copy memory address constants into regs before using") },
1107 {"function-cse", &flag_no_function_cse
, 0,
1108 N_("Allow function addresses to be held in registers") },
1109 {"inline-functions", &flag_inline_functions
, 1,
1110 N_("Integrate simple functions into their callers") },
1111 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1112 N_("Generate code for funcs even if they are fully inlined") },
1113 {"inline", &flag_no_inline
, 0,
1114 N_("Pay attention to the 'inline' keyword") },
1115 {"keep-static-consts", &flag_keep_static_consts
, 1,
1116 N_("Emit static const variables even if they are not used") },
1117 {"syntax-only", &flag_syntax_only
, 1,
1118 N_("Check for syntax errors, then stop") },
1119 {"shared-data", &flag_shared_data
, 1,
1120 N_("Mark data as shared rather than private") },
1121 {"caller-saves", &flag_caller_saves
, 1,
1122 N_("Enable saving registers around function calls") },
1123 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1124 N_("Return 'short' aggregates in memory, not registers") },
1125 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1126 N_("Return 'short' aggregates in registers") },
1127 {"delayed-branch", &flag_delayed_branch
, 1,
1128 N_("Attempt to fill delay slots of branch instructions") },
1129 {"gcse", &flag_gcse
, 1,
1130 N_("Perform the global common subexpression elimination") },
1131 {"gcse-lm", &flag_gcse_lm
, 1,
1132 N_("Perform enhanced load motion during global subexpression elimination") },
1133 {"gcse-sm", &flag_gcse_sm
, 1,
1134 N_("Perform store motion after global subexpression elimination") },
1135 {"loop-optimize", &flag_loop_optimize
, 1,
1136 N_("Perform the loop optimizations") },
1137 {"crossjumping", &flag_crossjumping
, 1,
1138 N_("Perform cross-jumping optimization") },
1139 {"if-conversion", &flag_if_conversion
, 1,
1140 N_("Perform conversion of conditional jumps to branchless equivalents") },
1141 {"if-conversion2", &flag_if_conversion2
, 1,
1142 N_("Perform conversion of conditional jumps to conditional execution") },
1143 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1144 N_("Run CSE pass after loop optimizations") },
1145 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1146 N_("Run the loop optimizer twice") },
1147 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1148 N_("Delete useless null pointer checks") },
1149 {"schedule-insns", &flag_schedule_insns
, 1,
1150 N_("Reschedule instructions before register allocation") },
1151 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1152 N_("Reschedule instructions after register allocation") },
1153 {"sched-interblock",&flag_schedule_interblock
, 1,
1154 N_("Enable scheduling across basic blocks") },
1155 {"sched-spec",&flag_schedule_speculative
, 1,
1156 N_("Allow speculative motion of non-loads") },
1157 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1158 N_("Allow speculative motion of some loads") },
1159 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1160 N_("Allow speculative motion of more loads") },
1161 {"sched2-use-superblocks", &flag_sched2_use_superblocks
, 1,
1162 N_("If scheduling post reload, do superblock scheduling") },
1163 {"sched2-use-traces", &flag_sched2_use_traces
, 1,
1164 N_("If scheduling post reload, do trace scheduling") },
1165 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1166 N_("Replace add,compare,branch with branch on count reg") },
1167 {"pic", &flag_pic
, 1,
1168 N_("Generate position independent code, if possible") },
1169 {"PIC", &flag_pic
, 2, ""},
1170 {"pie", &flag_pie
, 1,
1171 N_("Generate position independent code for executables, if possible") },
1172 {"PIE", &flag_pie
, 2, ""},
1173 {"exceptions", &flag_exceptions
, 1,
1174 N_("Enable exception handling") },
1175 {"unwind-tables", &flag_unwind_tables
, 1,
1176 N_("Just generate unwind tables for exception handling") },
1177 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1178 N_("Generate unwind tables exact at each instruction boundary") },
1179 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1180 N_("Support synchronous non-call exceptions") },
1181 {"profile-arcs", &profile_arc_flag
, 1,
1182 N_("Insert arc based program profiling code") },
1183 {"test-coverage", &flag_test_coverage
, 1,
1184 N_("Create data files needed by gcov") },
1185 {"branch-probabilities", &flag_branch_probabilities
, 1,
1186 N_("Use profiling information for branch probabilities") },
1187 {"profile", &profile_flag
, 1,
1188 N_("Enable basic program profiling code") },
1189 {"reorder-blocks", &flag_reorder_blocks
, 1,
1190 N_("Reorder basic blocks to improve code placement") },
1191 {"reorder-functions", &flag_reorder_functions
, 1,
1192 N_("Reorder functions to improve code placement") },
1193 {"rename-registers", &flag_rename_registers
, 1,
1194 N_("Do the register renaming optimization pass") },
1195 {"cprop-registers", &flag_cprop_registers
, 1,
1196 N_("Do the register copy-propagation optimization pass") },
1197 {"common", &flag_no_common
, 0,
1198 N_("Do not put uninitialized globals in the common section") },
1199 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1200 N_("Do not generate .size directives") },
1201 {"function-sections", &flag_function_sections
, 1,
1202 N_("place each function into its own section") },
1203 {"data-sections", &flag_data_sections
, 1,
1204 N_("place data items into their own section") },
1205 {"verbose-asm", &flag_verbose_asm
, 1,
1206 N_("Add extra commentary to assembler output") },
1207 {"gnu-linker", &flag_gnu_linker
, 1,
1208 N_("Output GNU ld formatted global initializers") },
1209 {"regmove", &flag_regmove
, 1,
1210 N_("Enables a register move optimization") },
1211 {"optimize-register-move", &flag_regmove
, 1,
1212 N_("Do the full regmove optimization pass") },
1213 {"pack-struct", &flag_pack_struct
, 1,
1214 N_("Pack structure members together without holes") },
1215 {"stack-check", &flag_stack_check
, 1,
1216 N_("Insert stack checking code into the program") },
1217 {"argument-alias", &flag_argument_noalias
, 0,
1218 N_("Specify that arguments may alias each other & globals") },
1219 {"argument-noalias", &flag_argument_noalias
, 1,
1220 N_("Assume arguments may alias globals but not each other") },
1221 {"argument-noalias-global", &flag_argument_noalias
, 2,
1222 N_("Assume arguments do not alias each other or globals") },
1223 {"strict-aliasing", &flag_strict_aliasing
, 1,
1224 N_("Assume strict aliasing rules apply") },
1225 {"align-loops", &align_loops
, 0,
1226 N_("Align the start of loops") },
1227 {"align-jumps", &align_jumps
, 0,
1228 N_("Align labels which are only reached by jumping") },
1229 {"align-labels", &align_labels
, 0,
1230 N_("Align all labels") },
1231 {"align-functions", &align_functions
, 0,
1232 N_("Align the start of functions") },
1233 {"merge-constants", &flag_merge_constants
, 1,
1234 N_("Attempt to merge identical constants across compilation units") },
1235 {"merge-all-constants", &flag_merge_constants
, 2,
1236 N_("Attempt to merge identical constants and constant variables") },
1237 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1238 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1239 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1240 N_("Instrument function entry/exit with profiling calls") },
1241 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1,
1242 N_("Put zero initialized data in the bss section") },
1243 {"ssa", &flag_ssa
, 1,
1244 N_("Enable SSA optimizations") },
1245 {"ssa-ccp", &flag_ssa_ccp
, 1,
1246 N_("Enable SSA conditional constant propagation") },
1247 {"ssa-dce", &flag_ssa_dce
, 1,
1248 N_("Enable aggressive SSA dead code elimination") },
1249 {"leading-underscore", &flag_leading_underscore
, 1,
1250 N_("External symbols have a leading underscore") },
1251 {"ident", &flag_no_ident
, 0,
1252 N_("Process #ident directives") },
1253 { "peephole2", &flag_peephole2
, 1,
1254 N_("Enables an rtl peephole pass run before sched2") },
1255 {"finite-math-only", &flag_finite_math_only
, 1,
1256 N_("Assume no NaNs or +-Infs are generated") },
1257 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1258 N_("Enables guessing of branch probabilities") },
1259 {"math-errno", &flag_errno_math
, 1,
1260 N_("Set errno after built-in math functions") },
1261 {"trapping-math", &flag_trapping_math
, 1,
1262 N_("Floating-point operations can trap") },
1263 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1264 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1265 {"signaling-nans", &flag_signaling_nans
, 1,
1266 N_("Disable optimizations observable by IEEE signaling NaNs") },
1267 {"bounds-check", &flag_bounds_check
, 1,
1268 N_("Generate code to check bounds before indexing arrays") },
1269 {"single-precision-constant", &flag_single_precision_constant
, 1,
1270 N_("Convert floating point constant to single precision constant") },
1271 {"time-report", &time_report
, 1,
1272 N_("Report time taken by each compiler pass at end of run") },
1273 {"mem-report", &mem_report
, 1,
1274 N_("Report on permanent memory allocation at end of run") },
1275 { "trapv", &flag_trapv
, 1,
1276 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1277 { "wrapv", &flag_wrapv
, 1,
1278 N_("Assume signed arithmetic overflow wraps around") },
1279 { "new-ra", &flag_new_regalloc
, 1,
1280 N_("Use graph coloring register allocation.") },
1283 /* Table of language-specific options. */
1285 static const struct lang_opt
1287 const char *const option
;
1288 const char *const description
;
1290 documented_lang_options
[] =
1292 /* In order not to overload the --help output, the convention
1293 used here is to only describe those options which are not
1294 enabled by default. */
1297 N_("Compile just for ISO C90") },
1299 N_("Determine language standard") },
1301 { "-fsigned-bitfields", "" },
1302 { "-funsigned-bitfields",
1303 N_("Make bit-fields by unsigned by default") },
1304 { "-fno-signed-bitfields", "" },
1305 { "-fno-unsigned-bitfields","" },
1307 N_("Make 'char' be signed by default") },
1308 { "-funsigned-char",
1309 N_("Make 'char' be unsigned by default") },
1310 { "-fno-signed-char", "" },
1311 { "-fno-unsigned-char", "" },
1315 N_("Do not recognize the 'asm' keyword") },
1316 { "-fbuiltin", "" },
1318 N_("Do not recognize any built in functions") },
1320 N_("Assume normal C execution environment") },
1321 { "-fno-hosted", "" },
1323 N_("Assume that standard libraries & main might not exist") },
1324 { "-fno-freestanding", "" },
1325 { "-fcond-mismatch",
1326 N_("Allow different types as args of ? operator") },
1327 { "-fno-cond-mismatch", "" },
1328 { "-fdollars-in-identifiers",
1329 N_("Allow the use of $ inside identifiers") },
1330 { "-fno-dollars-in-identifiers", "" },
1331 { "-fpreprocessed", "" },
1332 { "-fno-preprocessed", "" },
1334 N_("Use the same size for double as for float") },
1335 { "-fno-short-double", "" },
1337 N_("Use the smallest fitting integer to hold enums") },
1338 { "-fno-short-enums", "" },
1340 N_("Override the underlying type for wchar_t to `unsigned short'") },
1341 { "-fno-short-wchar", "" },
1344 N_("Enable most warning messages") },
1345 { "-Wbad-function-cast",
1346 N_("Warn about casting functions to incompatible types") },
1347 { "-Wno-bad-function-cast", "" },
1348 { "-Wmissing-format-attribute",
1349 N_("Warn about functions which might be candidates for format attributes") },
1350 { "-Wno-missing-format-attribute", "" },
1352 N_("Warn about casts which discard qualifiers") },
1353 { "-Wno-cast-qual", "" },
1354 { "-Wchar-subscripts",
1355 N_("Warn about subscripts whose type is 'char'") },
1356 { "-Wno-char-subscripts", "" },
1358 N_("Warn if nested comments are detected") },
1359 { "-Wno-comment", "" },
1361 N_("Warn if nested comments are detected") },
1362 { "-Wno-comments", "" },
1364 N_("Warn about possibly confusing type conversions") },
1365 { "-Wno-conversion", "" },
1366 { "-Wdiv-by-zero", "" },
1367 { "-Wno-div-by-zero",
1368 N_("Do not warn about compile-time integer division by zero") },
1370 N_("Warn about testing equality of floating point numbers") },
1371 { "-Wno-float-equal", "" },
1373 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1374 { "-Wno-format", "" },
1375 { "-Wformat-extra-args", "" },
1376 { "-Wno-format-extra-args",
1377 N_("Don't warn about too many arguments to format functions") },
1378 { "-Wformat-nonliteral",
1379 N_("Warn about non-string-literal format strings") },
1380 { "-Wno-format-nonliteral", "" },
1381 { "-Wformat-security",
1382 N_("Warn about possible security problems with format functions") },
1383 { "-Wno-format-security", "" },
1384 { "-Wformat-y2k", "" },
1385 { "-Wno-format-y2k",
1386 N_("Don't warn about strftime formats yielding 2 digit years") },
1387 { "-Wimplicit-function-declaration",
1388 N_("Warn about implicit function declarations") },
1389 { "-Wno-implicit-function-declaration", "" },
1390 { "-Werror-implicit-function-declaration", "" },
1392 N_("Warn when a declaration does not specify a type") },
1393 { "-Wno-implicit-int", "" },
1394 { "-Wimplicit", "" },
1395 { "-Wno-implicit", "" },
1397 N_("Warn about the use of the #import directive") },
1398 { "-Wno-import", "" },
1400 N_("Warn about PCH files that are found but not used") },
1401 { "-Wlong-long","" },
1403 N_("Do not warn about using 'long long' when -pedantic") },
1405 N_("Warn about suspicious declarations of main") },
1406 { "-Wno-main", "" },
1407 { "-Wmissing-braces",
1408 N_("Warn about possibly missing braces around initializers") },
1409 { "-Wno-missing-braces", "" },
1410 { "-Wmissing-declarations",
1411 N_("Warn about global funcs without previous declarations") },
1412 { "-Wno-missing-declarations", "" },
1413 { "-Wmissing-prototypes",
1414 N_("Warn about global funcs without prototypes") },
1415 { "-Wno-missing-prototypes", "" },
1417 N_("Warn about use of multicharacter literals") },
1418 { "-Wno-multichar", "" },
1419 { "-Wnested-externs",
1420 N_("Warn about externs not at file scope level") },
1421 { "-Wno-nested-externs", "" },
1423 N_("Warn about possible missing parentheses") },
1424 { "-Wno-parentheses", "" },
1425 { "-Wpointer-arith",
1426 N_("Warn about function pointer arithmetic") },
1427 { "-Wno-pointer-arith", "" },
1428 { "-Wredundant-decls",
1429 N_("Warn about multiple declarations of the same object") },
1430 { "-Wno-redundant-decls", "" },
1432 N_("Warn whenever a function's return-type defaults to int") },
1433 { "-Wno-return-type", "" },
1434 { "-Wsequence-point",
1435 N_("Warn about possible violations of sequence point rules") },
1436 { "-Wno-sequence-point", "" },
1438 N_("Warn about signed/unsigned comparisons") },
1439 { "-Wno-sign-compare", "" },
1440 { "-Wstrict-prototypes",
1441 N_("Warn about non-prototyped function decls") },
1442 { "-Wno-strict-prototypes", "" },
1444 N_("Warn about constructs whose meanings change in ISO C") },
1445 { "-Wno-traditional", "" },
1447 N_("Warn when trigraphs are encountered") },
1448 { "-Wno-trigraphs", "" },
1450 { "-Wno-undef", "" },
1451 { "-Wunknown-pragmas",
1452 N_("Warn about unrecognized pragmas") },
1453 { "-Wno-unknown-pragmas", "" },
1454 { "-Wwrite-strings",
1455 N_("Mark strings as 'const char *'") },
1456 { "-Wno-write-strings", "" },
1458 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1460 #include "options.h"
1464 /* Here is a table, controlled by the tm.h file, listing each -m switch
1465 and which bits in `target_switches' it should set or clear.
1466 If VALUE is positive, it is bits to set.
1467 If VALUE is negative, -VALUE is bits to clear.
1468 (The sign bit is not used so there is no confusion.) */
1472 const char *const name
;
1474 const char *const description
;
1476 target_switches
[] = TARGET_SWITCHES
;
1478 /* This table is similar, but allows the switch to have a value. */
1480 #ifdef TARGET_OPTIONS
1483 const char *const prefix
;
1484 const char **const variable
;
1485 const char *const description
;
1486 const char *const value
;
1488 target_options
[] = TARGET_OPTIONS
;
1491 /* Options controlling warnings. */
1493 /* Don't print warning messages. -w. */
1495 int inhibit_warnings
= 0;
1497 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1499 int warn_system_headers
= 0;
1501 /* Print various extra warnings. -W/-Wextra. */
1503 int extra_warnings
= 0;
1505 /* Treat warnings as errors. -Werror. */
1507 int warnings_are_errors
= 0;
1509 /* Nonzero to warn about unused variables, functions et.al. */
1511 int warn_unused_function
;
1512 int warn_unused_label
;
1513 int warn_unused_parameter
;
1514 int warn_unused_variable
;
1515 int warn_unused_value
;
1517 /* Used for cooperation between set_Wunused and set_Wextra. */
1518 static int maybe_warn_unused_parameter
;
1520 /* Nonzero to warn about code which is never reached. */
1522 int warn_notreached
;
1524 /* Nonzero to warn about variables used before they are initialized. */
1526 int warn_uninitialized
;
1528 /* Nonzero means warn about all declarations which shadow others. */
1532 /* Warn if a switch on an enum, that does not have a default case,
1533 fails to have a case for every enum value. */
1537 /* Warn if a switch does not have a default case. */
1539 int warn_switch_default
;
1541 /* Warn if a switch on an enum fails to have a case for every enum
1542 value (regardless of the presence or otherwise of a default case). */
1544 int warn_switch_enum
;
1546 /* Nonzero means warn about function definitions that default the return type
1547 or that use a null return and have a return-type other than void. */
1549 int warn_return_type
;
1551 /* Nonzero means warn about pointer casts that increase the required
1552 alignment of the target type (and might therefore lead to a crash
1553 due to a misaligned access). */
1555 int warn_cast_align
;
1557 /* Nonzero means warn about any objects definitions whose size is larger
1558 than N bytes. Also want about function definitions whose returned
1559 values are larger than N bytes. The value N is in `larger_than_size'. */
1561 int warn_larger_than
;
1562 HOST_WIDE_INT larger_than_size
;
1564 /* Nonzero means warn if inline function is too large. */
1568 /* Warn if a function returns an aggregate,
1569 since there are often incompatible calling conventions for doing this. */
1571 int warn_aggregate_return
;
1573 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1577 /* Warn when gcc pads a structure to an alignment boundary. */
1581 /* Warn when an optimization pass is disabled. */
1583 int warn_disabled_optimization
;
1585 /* Warn about functions which might be candidates for attribute noreturn. */
1587 int warn_missing_noreturn
;
1589 /* Nonzero means warn about uses of __attribute__((deprecated))
1592 int warn_deprecated_decl
= 1;
1594 /* Nonzero means warn about constructs which might not be
1595 strict-aliasing safe. */
1597 int warn_strict_aliasing
;
1599 /* Like f_options, but for -W. */
1601 static const lang_independent_options W_options
[] =
1603 {"unused-function", &warn_unused_function
, 1,
1604 N_("Warn when a function is unused") },
1605 {"unused-label", &warn_unused_label
, 1,
1606 N_("Warn when a label is unused") },
1607 {"unused-parameter", &warn_unused_parameter
, 1,
1608 N_("Warn when a function parameter is unused") },
1609 {"unused-variable", &warn_unused_variable
, 1,
1610 N_("Warn when a variable is unused") },
1611 {"unused-value", &warn_unused_value
, 1,
1612 N_("Warn when an expression value is unused") },
1613 {"system-headers", &warn_system_headers
, 1,
1614 N_("Do not suppress warnings from system headers") },
1615 {"error", &warnings_are_errors
, 1,
1616 N_("Treat all warnings as errors") },
1617 {"shadow", &warn_shadow
, 1,
1618 N_("Warn when one local variable shadows another") },
1619 {"switch", &warn_switch
, 1,
1620 N_("Warn about enumerated switches, with no default, missing a case") },
1621 {"switch-default", &warn_switch_default
, 1,
1622 N_("Warn about enumerated switches missing a default case") },
1623 {"switch-enum", &warn_switch_enum
, 1,
1624 N_("Warn about all enumerated switches missing a specific case") },
1625 {"aggregate-return", &warn_aggregate_return
, 1,
1626 N_("Warn about returning structures, unions or arrays") },
1627 {"cast-align", &warn_cast_align
, 1,
1628 N_("Warn about pointer casts which increase alignment") },
1629 {"unreachable-code", &warn_notreached
, 1,
1630 N_("Warn about code that will never be executed") },
1631 {"uninitialized", &warn_uninitialized
, 1,
1632 N_("Warn about uninitialized automatic variables") },
1633 {"inline", &warn_inline
, 1,
1634 N_("Warn when an inlined function cannot be inlined") },
1635 {"packed", &warn_packed
, 1,
1636 N_("Warn when the packed attribute has no effect on struct layout") },
1637 {"padded", &warn_padded
, 1,
1638 N_("Warn when padding is required to align struct members") },
1639 {"disabled-optimization", &warn_disabled_optimization
, 1,
1640 N_("Warn when an optimization pass is disabled") },
1641 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1642 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1643 {"missing-noreturn", &warn_missing_noreturn
, 1,
1644 N_("Warn about functions which might be candidates for attribute noreturn") },
1645 {"strict-aliasing", &warn_strict_aliasing
, 1,
1646 N_ ("Warn about code which might break the strict aliasing rules") }
1649 /* Initialize unused warning flags. */
1651 set_Wunused (int setting
)
1653 warn_unused_function
= setting
;
1654 warn_unused_label
= setting
;
1655 /* Unused function parameter warnings are reported when either
1656 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1657 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1658 otherwise set maybe_warn_extra_parameter, which will be picked up
1660 maybe_warn_unused_parameter
= setting
;
1661 warn_unused_parameter
= (setting
&& extra_warnings
);
1662 warn_unused_variable
= setting
;
1663 warn_unused_value
= setting
;
1666 /* Initialize more unused warning flags. */
1668 set_Wextra (int setting
)
1670 extra_warnings
= setting
;
1671 warn_unused_value
= setting
;
1672 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1674 /* We save the value of warn_uninitialized, since if they put
1675 -Wuninitialized on the command line, we need to generate a
1676 warning about not using it without also specifying -O. */
1678 warn_uninitialized
= 0;
1679 else if (warn_uninitialized
!= 1)
1680 warn_uninitialized
= 2;
1683 /* The following routines are useful in setting all the flags that
1684 -ffast-math and -fno-fast-math imply. */
1687 set_fast_math_flags (int set
)
1689 flag_trapping_math
= !set
;
1690 flag_unsafe_math_optimizations
= set
;
1691 flag_finite_math_only
= set
;
1692 flag_errno_math
= !set
;
1694 flag_signaling_nans
= 0;
1697 /* Return true iff flags are set as if -ffast-math. */
1699 fast_math_flags_set_p (void)
1701 return (!flag_trapping_math
1702 && flag_unsafe_math_optimizations
1703 && flag_finite_math_only
1704 && !flag_errno_math
);
1707 /* Output files for assembler code (real compiler output)
1708 and debugging dumps. */
1711 FILE *aux_info_file
;
1712 FILE *rtl_dump_file
= NULL
;
1714 /* Decode the string P as an integral parameter.
1715 If the string is indeed an integer return its numeric value else
1716 issue an Invalid Option error for the option PNAME and return DEFVAL.
1717 If PNAME is zero just return DEFVAL, do not call error. */
1720 read_integral_parameter (const char *p
, const char *pname
, const int defval
)
1722 const char *endp
= p
;
1726 if (ISDIGIT (*endp
))
1735 error ("invalid option argument `%s'", pname
);
1742 /* Return the logarithm of X, base 2, considering X unsigned,
1743 if X is a power of 2. Otherwise, returns -1.
1745 This should be used via the `exact_log2' macro. */
1748 exact_log2_wide (unsigned HOST_WIDE_INT x
)
1751 /* Test for 0 or a power of 2. */
1752 if (x
== 0 || x
!= (x
& -x
))
1754 while ((x
>>= 1) != 0)
1759 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1760 If X is 0, return -1.
1762 This should be used via the floor_log2 macro. */
1765 floor_log2_wide (unsigned HOST_WIDE_INT x
)
1774 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1775 into ICE messages, which is much more user friendly. In case the
1776 error printer crashes, reset the signal to prevent infinite recursion. */
1779 crash_signal (int signo
)
1781 signal (signo
, SIG_DFL
);
1782 internal_error ("%s", strsignal (signo
));
1785 /* Arrange to dump core on error. (The regular error message is still
1786 printed first, except in the case of abort().) */
1789 setup_core_dumping (void)
1792 signal (SIGABRT
, SIG_DFL
);
1794 #if defined(HAVE_SETRLIMIT)
1797 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
1798 fatal_error ("getting core file size maximum limit: %m");
1799 rlim
.rlim_cur
= rlim
.rlim_max
;
1800 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
1801 fatal_error ("setting core file size limit to maximum: %m");
1804 diagnostic_abort_on_error (global_dc
);
1808 /* Strip off a legitimate source ending from the input string NAME of
1809 length LEN. Rather than having to know the names used by all of
1810 our front ends, we strip off an ending of a period followed by
1811 up to five characters. (Java uses ".class".) */
1814 strip_off_ending (char *name
, int len
)
1817 for (i
= 2; i
< 6 && len
> i
; i
++)
1819 if (name
[len
- i
] == '.')
1821 name
[len
- i
] = '\0';
1827 /* Output a quoted string. */
1830 output_quoted_string (FILE *asm_file
, const char *string
)
1832 #ifdef OUTPUT_QUOTED_STRING
1833 OUTPUT_QUOTED_STRING (asm_file
, string
);
1837 putc ('\"', asm_file
);
1838 while ((c
= *string
++) != 0)
1842 if (c
== '\"' || c
== '\\')
1843 putc ('\\', asm_file
);
1847 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1849 putc ('\"', asm_file
);
1853 /* Output NAME into FILE after having turned it into something
1854 usable as an identifier in a target's assembly file. */
1856 output_clean_symbol_name (FILE *file
, const char *name
)
1858 /* Make a copy of NAME. */
1859 char *id
= xstrdup (name
);
1861 /* Make it look like a valid identifier for an assembler. */
1862 clean_symbol_name (id
);
1869 /* Output a file name in the form wanted by System V. */
1872 output_file_directive (FILE *asm_file
, const char *input_name
)
1874 int len
= strlen (input_name
);
1875 const char *na
= input_name
+ len
;
1877 /* NA gets INPUT_NAME sans directory names. */
1878 while (na
> input_name
)
1880 if (IS_DIR_SEPARATOR (na
[-1]))
1885 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1886 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1888 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1889 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1891 fprintf (asm_file
, "\t.file\t");
1892 output_quoted_string (asm_file
, na
);
1893 fputc ('\n', asm_file
);
1898 /* Routine to open a dump file. Return true if the dump file is enabled. */
1901 open_dump_file (enum dump_file_index index
, tree decl
)
1904 const char *open_arg
;
1907 if (! dump_file
[index
].enabled
)
1910 timevar_push (TV_DUMP
);
1911 if (rtl_dump_file
!= NULL
)
1912 fclose (rtl_dump_file
);
1914 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1916 if (! dump_file
[index
].initialized
)
1918 /* If we've not initialized the files, do so now. */
1919 if (graph_dump_format
!= no_graph
1920 && dump_file
[index
].graph_dump_p
)
1922 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1923 clean_graph_dump_file (dump_base_name
, dump_name
);
1926 dump_file
[index
].initialized
= 1;
1932 dump_name
= concat (dump_base_name
, seq
,
1933 dump_file
[index
].extension
, NULL
);
1935 rtl_dump_file
= fopen (dump_name
, open_arg
);
1936 if (rtl_dump_file
== NULL
)
1937 fatal_error ("can't open %s: %m", dump_name
);
1942 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1943 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1944 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1946 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1947 ? " (unlikely executed)"
1950 timevar_pop (TV_DUMP
);
1954 /* Routine to close a dump file. */
1957 close_dump_file (enum dump_file_index index
,
1958 void (*func
) (FILE *, rtx
),
1961 if (! rtl_dump_file
)
1964 timevar_push (TV_DUMP
);
1966 && graph_dump_format
!= no_graph
1967 && dump_file
[index
].graph_dump_p
)
1972 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1973 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1974 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1979 func (rtl_dump_file
, insns
);
1981 fflush (rtl_dump_file
);
1982 fclose (rtl_dump_file
);
1984 rtl_dump_file
= NULL
;
1985 timevar_pop (TV_DUMP
);
1988 /* Do any final processing required for the declarations in VEC, of
1989 which there are LEN. We write out inline functions and variables
1990 that have been deferred until this point, but which are required.
1991 Returns nonzero if anything was put out. */
1994 wrapup_global_declarations (tree
*vec
, int len
)
1999 int output_something
= 0;
2001 for (i
= 0; i
< len
; i
++)
2005 /* We're not deferring this any longer. Assignment is
2006 conditional to avoid needlessly dirtying PCH pages. */
2007 if (DECL_DEFER_OUTPUT (decl
) != 0)
2008 DECL_DEFER_OUTPUT (decl
) = 0;
2010 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
2011 (*lang_hooks
.finish_incomplete_decl
) (decl
);
2014 /* Now emit any global variables or functions that we have been
2015 putting off. We need to loop in case one of the things emitted
2016 here references another one which comes earlier in the list. */
2020 for (i
= 0; i
< len
; i
++)
2024 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
2027 /* Don't write out static consts, unless we still need them.
2029 We also keep static consts if not optimizing (for debugging),
2030 unless the user specified -fno-keep-static-consts.
2031 ??? They might be better written into the debug information.
2032 This is possible when using DWARF.
2034 A language processor that wants static constants to be always
2035 written out (even if it is not used) is responsible for
2036 calling rest_of_decl_compilation itself. E.g. the C front-end
2037 calls rest_of_decl_compilation from finish_decl.
2038 One motivation for this is that is conventional in some
2039 environments to write things like:
2040 static const char rcsid[] = "... version string ...";
2041 intending to force the string to be in the executable.
2043 A language processor that would prefer to have unneeded
2044 static constants "optimized away" would just defer writing
2045 them out until here. E.g. C++ does this, because static
2046 constants are often defined in header files.
2048 ??? A tempting alternative (for both C and C++) would be
2049 to force a constant to be written if and only if it is
2050 defined in a main file, as opposed to an include file. */
2052 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
2056 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2058 else if (DECL_COMDAT (decl
))
2060 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
2061 && (optimize
|| !flag_keep_static_consts
2062 || DECL_ARTIFICIAL (decl
)))
2068 rest_of_decl_compilation (decl
, NULL
, 1, 1);
2072 if (TREE_CODE (decl
) == FUNCTION_DECL
2073 && DECL_INITIAL (decl
) != 0
2074 && DECL_SAVED_INSNS (decl
) != 0
2075 && (flag_keep_inline_functions
2076 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
2077 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
2080 output_inline_function (decl
);
2085 output_something
= 1;
2089 return output_something
;
2092 /* Issue appropriate warnings for the global declarations in VEC (of
2093 which there are LEN). Output debugging information for them. */
2096 check_global_declarations (tree
*vec
, int len
)
2101 for (i
= 0; i
< len
; i
++)
2105 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2106 && ! TREE_ASM_WRITTEN (decl
))
2107 /* Cancel the RTL for this decl so that, if debugging info
2108 output for global variables is still to come,
2109 this one will be omitted. */
2110 SET_DECL_RTL (decl
, NULL_RTX
);
2112 /* Warn about any function
2113 declared static but not defined.
2114 We don't warn about variables,
2115 because many programs have static variables
2116 that exist only to get some text into the object file. */
2117 if (TREE_CODE (decl
) == FUNCTION_DECL
2118 && (warn_unused_function
2119 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2120 && DECL_INITIAL (decl
) == 0
2121 && DECL_EXTERNAL (decl
)
2122 && ! DECL_ARTIFICIAL (decl
)
2123 && ! TREE_PUBLIC (decl
))
2125 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2126 pedwarn_with_decl (decl
,
2127 "`%s' used but never defined");
2129 warning_with_decl (decl
,
2130 "`%s' declared `static' but never defined");
2131 /* This symbol is effectively an "extern" declaration now. */
2132 TREE_PUBLIC (decl
) = 1;
2133 assemble_external (decl
);
2136 /* Warn about static fns or vars defined but not used. */
2137 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
2138 || (warn_unused_variable
&& TREE_CODE (decl
) == VAR_DECL
))
2139 && ! TREE_USED (decl
)
2140 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2141 to handle multiple external decls in different scopes. */
2142 && ! TREE_USED (DECL_NAME (decl
))
2143 && ! DECL_EXTERNAL (decl
)
2144 && ! TREE_PUBLIC (decl
)
2145 /* A volatile variable might be used in some non-obvious way. */
2146 && ! TREE_THIS_VOLATILE (decl
)
2147 /* Global register variables must be declared to reserve them. */
2148 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
2149 /* Otherwise, ask the language. */
2150 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
2151 warning_with_decl (decl
, "`%s' defined but not used");
2153 /* Avoid confusing the debug information machinery when there are
2155 if (errorcount
== 0 && sorrycount
== 0)
2157 timevar_push (TV_SYMOUT
);
2158 (*debug_hooks
->global_decl
) (decl
);
2159 timevar_pop (TV_SYMOUT
);
2164 /* Save the current INPUT_LOCATION on the top entry in the
2165 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2166 INPUT_LOCATION accordingly. */
2169 push_srcloc (const char *file
, int line
)
2171 struct file_stack
*fs
;
2173 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2174 fs
->location
= input_location
;
2175 fs
->next
= input_file_stack
;
2176 input_filename
= file
;
2178 input_file_stack
= fs
;
2179 input_file_stack_tick
++;
2182 /* Pop the top entry off the stack of presently open source files.
2183 Restore the INPUT_LOCATION from the new topmost entry on the
2189 struct file_stack
*fs
;
2191 fs
= input_file_stack
;
2192 input_location
= fs
->location
;
2193 input_file_stack
= fs
->next
;
2195 input_file_stack_tick
++;
2198 /* Compile an entire translation unit. Write a file of assembly
2199 output and various debugging dumps. */
2204 /* Initialize yet another pass. */
2206 init_final (main_input_filename
);
2207 coverage_init (aux_base_name
);
2209 timevar_push (TV_PARSE
);
2211 /* Call the parser, which parses the entire file (calling
2212 rest_of_compilation for each function). */
2213 (*lang_hooks
.parse_file
) (set_yydebug
);
2215 /* In case there were missing block closers,
2216 get us back to the global binding level. */
2217 (*lang_hooks
.clear_binding_stack
) ();
2219 /* Compilation is now finished except for writing
2220 what's left of the symbol table output. */
2221 timevar_pop (TV_PARSE
);
2223 if (flag_syntax_only
)
2226 (*lang_hooks
.decls
.final_write_globals
)();
2228 /* This must occur after the loop to output deferred functions.
2229 Else the coverage initializer would not be emitted if all the
2230 functions in this compilation unit were deferred. */
2233 /* Write out any pending weak symbol declarations. */
2237 /* Do dbx symbols. */
2238 timevar_push (TV_SYMOUT
);
2240 #ifdef DWARF2_UNWIND_INFO
2241 if (dwarf2out_do_frame ())
2242 dwarf2out_frame_finish ();
2245 (*debug_hooks
->finish
) (main_input_filename
);
2246 timevar_pop (TV_SYMOUT
);
2248 /* Output some stuff at end of file if nec. */
2250 dw2_output_indirect_constants ();
2252 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2254 timevar_push (TV_DUMP
);
2255 open_dump_file (DFI_bp
, NULL
);
2259 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2260 timevar_pop (TV_DUMP
);
2264 ASM_FILE_END (asm_out_file
);
2267 /* Attach a special .ident directive to the end of the file to identify
2268 the version of GCC which compiled this code. The format of the .ident
2269 string is patterned after the ones produced by native SVR4 compilers. */
2272 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2273 IDENT_ASM_OP
, version_string
);
2276 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2278 timevar_push (TV_DUMP
);
2279 dump_combine_total_stats (rtl_dump_file
);
2280 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2281 timevar_pop (TV_DUMP
);
2285 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2286 and TYPE_DECL nodes.
2288 This does nothing for local (non-static) variables, unless the
2289 variable is a register variable with an ASMSPEC. In that case, or
2290 if the variable is not an automatic, it sets up the RTL and
2291 outputs any assembler code (label definition, storage allocation
2292 and initialization).
2294 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2295 the assembler symbol name to be used. TOP_LEVEL is nonzero
2296 if this declaration is not within a function. */
2299 rest_of_decl_compilation (tree decl
,
2300 const char *asmspec
,
2304 /* We deferred calling assemble_alias so that we could collect
2305 other attributes such as visibility. Emit the alias now. */
2308 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2311 alias
= TREE_VALUE (TREE_VALUE (alias
));
2312 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2313 assemble_alias (decl
, alias
);
2317 /* Forward declarations for nested functions are not "external",
2318 but we need to treat them as if they were. */
2319 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2320 || TREE_CODE (decl
) == FUNCTION_DECL
)
2322 timevar_push (TV_VARCONST
);
2325 make_decl_rtl (decl
, asmspec
);
2327 /* Don't output anything when a tentative file-scope definition
2328 is seen. But at end of compilation, do output code for them. */
2329 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2330 assemble_variable (decl
, top_level
, at_end
, 0);
2332 #ifdef ASM_FINISH_DECLARE_OBJECT
2333 if (decl
== last_assemble_variable_decl
)
2335 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2340 timevar_pop (TV_VARCONST
);
2342 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2344 if (decode_reg_name (asmspec
) >= 0)
2346 SET_DECL_RTL (decl
, NULL_RTX
);
2347 make_decl_rtl (decl
, asmspec
);
2351 error ("invalid register name `%s' for register variable", asmspec
);
2352 DECL_REGISTER (decl
) = 0;
2357 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2358 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2359 && TREE_CODE (decl
) == TYPE_DECL
)
2361 timevar_push (TV_SYMOUT
);
2362 dbxout_symbol (decl
, 0);
2363 timevar_pop (TV_SYMOUT
);
2366 #ifdef SDB_DEBUGGING_INFO
2367 else if (write_symbols
== SDB_DEBUG
&& top_level
2368 && TREE_CODE (decl
) == TYPE_DECL
)
2370 timevar_push (TV_SYMOUT
);
2371 sdbout_symbol (decl
, 0);
2372 timevar_pop (TV_SYMOUT
);
2375 #ifdef DWARF2_DEBUGGING_INFO
2376 else if ((write_symbols
== DWARF2_DEBUG
2377 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2379 && TREE_CODE (decl
) == TYPE_DECL
)
2381 timevar_push (TV_SYMOUT
);
2382 dwarf2out_decl (decl
);
2383 timevar_pop (TV_SYMOUT
);
2388 /* Called after finishing a record, union or enumeral type. */
2391 rest_of_type_compilation (
2392 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2393 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2397 tree type ATTRIBUTE_UNUSED
,
2398 int toplev ATTRIBUTE_UNUSED
2402 /* Avoid confusing the debug information machinery when there are
2404 if (errorcount
!= 0 || sorrycount
!= 0)
2407 timevar_push (TV_SYMOUT
);
2408 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2409 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2410 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2412 #ifdef SDB_DEBUGGING_INFO
2413 if (write_symbols
== SDB_DEBUG
)
2414 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2416 #ifdef DWARF2_DEBUGGING_INFO
2417 if ((write_symbols
== DWARF2_DEBUG
2418 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2420 dwarf2out_decl (TYPE_STUB_DECL (type
));
2422 timevar_pop (TV_SYMOUT
);
2425 /* Turn the RTL into assembly. */
2427 rest_of_handle_final (tree decl
, rtx insns
)
2429 timevar_push (TV_FINAL
);
2434 /* Get the function's name, as described by its RTL. This may be
2435 different from the DECL_NAME name used in the source file. */
2437 x
= DECL_RTL (decl
);
2438 if (GET_CODE (x
) != MEM
)
2441 if (GET_CODE (x
) != SYMBOL_REF
)
2443 fnname
= XSTR (x
, 0);
2445 assemble_start_function (decl
, fnname
);
2446 final_start_function (insns
, asm_out_file
, optimize
);
2447 final (insns
, asm_out_file
, optimize
, 0);
2448 final_end_function ();
2450 #ifdef IA64_UNWIND_INFO
2451 /* ??? The IA-64 ".handlerdata" directive must be issued before
2452 the ".endp" directive that closes the procedure descriptor. */
2453 output_function_exception_table ();
2456 assemble_end_function (decl
, fnname
);
2458 #ifndef IA64_UNWIND_INFO
2459 /* Otherwise, it feels unclean to switch sections in the middle. */
2460 output_function_exception_table ();
2464 fflush (asm_out_file
);
2466 /* Release all memory allocated by flow. */
2467 free_basic_block_vars (0);
2469 /* Release all memory held by regsets now. */
2470 regset_release_memory ();
2472 timevar_pop (TV_FINAL
);
2478 /* Run delay slot optimization. */
2480 rest_of_handle_delay_slots (tree decl
, rtx insns
)
2482 timevar_push (TV_DBR_SCHED
);
2483 open_dump_file (DFI_dbr
, decl
);
2485 dbr_schedule (insns
, rtl_dump_file
);
2487 close_dump_file (DFI_dbr
, print_rtl
, insns
);
2488 timevar_pop (TV_DBR_SCHED
);
2495 /* Convert register usage from flat register file usage to a stack
2498 rest_of_handle_stack_regs (tree decl
, rtx insns
)
2500 timevar_push (TV_REG_STACK
);
2501 open_dump_file (DFI_stack
, decl
);
2503 if (reg_to_stack (insns
, rtl_dump_file
) && optimize
)
2505 if (cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
2506 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0))
2507 && flag_reorder_blocks
)
2509 reorder_basic_blocks ();
2510 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
2514 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
2515 timevar_pop (TV_REG_STACK
);
2522 /* Machine independent reorg pass. */
2524 rest_of_handle_machine_reorg (tree decl
, rtx insns
)
2526 timevar_push (TV_MACH_DEP
);
2527 open_dump_file (DFI_mach
, decl
);
2529 (*targetm
.machine_dependent_reorg
) ();
2531 close_dump_file (DFI_mach
, print_rtl
, insns
);
2532 timevar_pop (TV_MACH_DEP
);
2538 /* Run new register allocator. Return TRUE if we must exit
2539 rest_of_compilation upon return. */
2541 rest_of_handle_new_regalloc (tree decl
, rtx insns
, int *rebuild_notes
)
2545 delete_trivially_dead_insns (insns
, max_reg_num ());
2548 timevar_pop (TV_LOCAL_ALLOC
);
2549 if (dump_file
[DFI_lreg
].enabled
)
2551 timevar_push (TV_DUMP
);
2553 close_dump_file (DFI_lreg
, NULL
, NULL
);
2554 timevar_pop (TV_DUMP
);
2557 /* XXX clean up the whole mess to bring live info in shape again. */
2558 timevar_push (TV_GLOBAL_ALLOC
);
2559 open_dump_file (DFI_greg
, decl
);
2561 build_insn_chain (insns
);
2562 failure
= reload (insns
, 0);
2564 timevar_pop (TV_GLOBAL_ALLOC
);
2566 if (dump_file
[DFI_greg
].enabled
)
2568 timevar_push (TV_DUMP
);
2570 dump_global_regs (rtl_dump_file
);
2572 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2573 timevar_pop (TV_DUMP
);
2579 reload_completed
= 1;
2585 /* Run old register allocator. Return TRUE if we must exit
2586 rest_of_compilation upon return. */
2588 rest_of_handle_old_regalloc (tree decl
, rtx insns
, int *rebuild_notes
)
2592 /* Allocate the reg_renumber array. */
2593 allocate_reg_info (max_regno
, FALSE
, TRUE
);
2595 /* And the reg_equiv_memory_loc array. */
2596 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
2598 allocate_initial_values (reg_equiv_memory_loc
);
2600 regclass (insns
, max_reg_num (), rtl_dump_file
);
2601 *rebuild_notes
= local_alloc ();
2603 timevar_pop (TV_LOCAL_ALLOC
);
2605 if (dump_file
[DFI_lreg
].enabled
)
2607 timevar_push (TV_DUMP
);
2609 dump_flow_info (rtl_dump_file
);
2610 dump_local_alloc (rtl_dump_file
);
2612 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
2613 timevar_pop (TV_DUMP
);
2618 timevar_push (TV_GLOBAL_ALLOC
);
2619 open_dump_file (DFI_greg
, decl
);
2621 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2622 pass fixing up any insns that are invalid. */
2625 failure
= global_alloc (rtl_dump_file
);
2628 build_insn_chain (insns
);
2629 failure
= reload (insns
, 0);
2632 timevar_pop (TV_GLOBAL_ALLOC
);
2634 if (dump_file
[DFI_greg
].enabled
)
2636 timevar_push (TV_DUMP
);
2638 dump_global_regs (rtl_dump_file
);
2640 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2641 timevar_pop (TV_DUMP
);
2647 /* Run the regrename and cprop passes. */
2649 rest_of_handle_regrename (tree decl
, rtx insns
)
2651 timevar_push (TV_RENAME_REGISTERS
);
2652 open_dump_file (DFI_rnreg
, decl
);
2654 if (flag_rename_registers
)
2655 regrename_optimize ();
2656 if (flag_cprop_registers
)
2657 copyprop_hardreg_forward ();
2659 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
2660 timevar_pop (TV_RENAME_REGISTERS
);
2663 /* Reorder basic blocks. */
2665 rest_of_handle_reorder_blocks (tree decl
, rtx insns
)
2667 timevar_push (TV_REORDER_BLOCKS
);
2668 open_dump_file (DFI_bbro
, decl
);
2670 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2671 splitting possibly introduced more crossjumping opportunities. */
2672 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
2673 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
2675 if (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
)
2677 if (flag_reorder_blocks
)
2678 reorder_basic_blocks ();
2679 if (flag_reorder_blocks
2680 || (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
))
2681 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2683 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
2684 timevar_pop (TV_REORDER_BLOCKS
);
2687 /* Run instruction scheduler. */
2689 rest_of_handle_sched (tree decl
, rtx insns
)
2691 timevar_push (TV_SCHED
);
2692 #ifdef INSN_SCHEDULING
2694 /* Print function header into sched dump now
2695 because doing the sched analysis makes some of the dump. */
2696 if (optimize
> 0 && flag_schedule_insns
)
2698 open_dump_file (DFI_sched
, decl
);
2700 /* Do control and data sched analysis,
2701 and write some of the results to dump file. */
2703 schedule_insns (rtl_dump_file
);
2705 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
2708 timevar_pop (TV_SCHED
);
2713 #ifdef INSN_SCHEDULING
2714 /* Run second scheduling pass after reload. */
2716 rest_of_handle_sched2 (tree decl
, rtx insns
)
2718 timevar_push (TV_SCHED2
);
2719 open_dump_file (DFI_sched2
, decl
);
2721 /* Do control and data sched analysis again,
2722 and write some more of the results to dump file. */
2724 split_all_insns (1);
2726 if (flag_sched2_use_superblocks
|| flag_sched2_use_traces
)
2728 schedule_ebbs (rtl_dump_file
);
2729 /* No liveness updating code yet, but it should be easy to do.
2730 reg-stack recompute the liveness when needed for now. */
2731 count_or_remove_death_notes (NULL
, 1);
2732 cleanup_cfg (CLEANUP_EXPENSIVE
);
2735 schedule_insns (rtl_dump_file
);
2737 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
2738 timevar_pop (TV_SCHED2
);
2744 /* Register allocation pre-pass, to reduce number of moves necessary
2745 for two-address machines. */
2747 rest_of_handle_regmove (tree decl
, rtx insns
)
2749 timevar_push (TV_REGMOVE
);
2750 open_dump_file (DFI_regmove
, decl
);
2752 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
2754 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2755 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
2756 timevar_pop (TV_REGMOVE
);
2763 rest_of_handle_tracer (tree decl
, rtx insns
)
2765 timevar_push (TV_TRACER
);
2766 open_dump_file (DFI_tracer
, decl
);
2768 dump_flow_info (rtl_dump_file
);
2770 cleanup_cfg (CLEANUP_EXPENSIVE
);
2771 reg_scan (insns
, max_reg_num (), 0);
2772 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
2773 timevar_pop (TV_TRACER
);
2776 /* If-conversion and CFG cleanup. */
2778 rest_of_handle_if_conversion (tree decl
, rtx insns
)
2780 open_dump_file (DFI_ce1
, decl
);
2781 if (flag_if_conversion
)
2783 timevar_push (TV_IFCVT
);
2785 dump_flow_info (rtl_dump_file
);
2786 cleanup_cfg (CLEANUP_EXPENSIVE
);
2787 reg_scan (insns
, max_reg_num (), 0);
2789 timevar_pop (TV_IFCVT
);
2791 timevar_push (TV_JUMP
);
2792 cleanup_cfg (CLEANUP_EXPENSIVE
);
2793 reg_scan (insns
, max_reg_num (), 0);
2794 timevar_pop (TV_JUMP
);
2795 close_dump_file (DFI_ce1
, print_rtl_with_bb
, get_insns ());
2798 /* Rerun if-conversion, as combine may have simplified things enough
2799 to now meet sequence length restrictions. */
2801 rest_of_handle_if_after_combine (tree decl
, rtx insns
)
2803 timevar_push (TV_IFCVT
);
2804 open_dump_file (DFI_ce2
, decl
);
2810 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
2811 timevar_pop (TV_IFCVT
);
2814 /* Do branch profiling and static profile estimation passes. */
2816 rest_of_handle_branch_prob (tree decl
, rtx insns
)
2820 timevar_push (TV_BRANCH_PROB
);
2821 open_dump_file (DFI_bp
, decl
);
2822 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2825 /* Discover and record the loop depth at the head of each basic
2826 block. The loop infrastructure does the real job for us. */
2827 flow_loops_find (&loops
, LOOP_TREE
);
2830 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2832 /* Estimate using heuristics if no profiling info is available. */
2833 if (flag_guess_branch_prob
)
2834 estimate_probability (&loops
);
2836 flow_loops_free (&loops
);
2837 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2838 timevar_pop (TV_BRANCH_PROB
);
2841 /* Do control and data flow analysis; write some of the results to the
2844 rest_of_handle_cfg (tree decl
, rtx insns
)
2846 open_dump_file (DFI_cfg
, decl
);
2848 dump_flow_info (rtl_dump_file
);
2850 cleanup_cfg (CLEANUP_EXPENSIVE
2851 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2853 /* It may make more sense to mark constant functions after dead code is
2854 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2855 may insert code making function non-constant, but we still must consider
2856 it as constant, otherwise -fbranch-probabilities will not read data back.
2858 life_analysis rarely eliminates modification of external memory.
2861 mark_constant_function ();
2863 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2866 /* Purge addressofs. */
2868 rest_of_handle_addresof (tree decl
, rtx insns
)
2870 open_dump_file (DFI_addressof
, decl
);
2872 purge_addressof (insns
);
2874 purge_all_dead_edges (0);
2875 reg_scan (insns
, max_reg_num (), 1);
2877 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2880 /* We may have potential sibling or tail recursion sites. Select one
2881 (of possibly multiple) methods of performing the call. */
2883 rest_of_handle_sibling_calls (rtx insns
)
2886 optimize_sibling_and_tail_recursive_calls ();
2888 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2889 free_bb_for_insn ();
2890 find_exception_handler_labels ();
2891 rebuild_jump_labels (insns
);
2892 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2894 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2895 notes before simplifying cfg and we must do lowering after sibcall
2896 that unhides parts of RTL chain and cleans up the CFG.
2898 Until sibcall is replaced by tree-level optimizer, lets just
2899 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2900 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2901 if (GET_CODE (insn
) == NOTE
2902 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2905 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2908 /* Perform jump bypassing and control flow optimizations. */
2910 rest_of_handle_jump_bypass (tree decl
, rtx insns
)
2912 timevar_push (TV_BYPASS
);
2913 open_dump_file (DFI_bypass
, decl
);
2915 cleanup_cfg (CLEANUP_EXPENSIVE
);
2917 if (bypass_jumps (rtl_dump_file
))
2919 rebuild_jump_labels (insns
);
2920 cleanup_cfg (CLEANUP_EXPENSIVE
);
2921 delete_trivially_dead_insns (insns
, max_reg_num ());
2924 close_dump_file (DFI_bypass
, print_rtl_with_bb
, insns
);
2925 timevar_pop (TV_BYPASS
);
2929 #ifdef ENABLE_CHECKING
2930 verify_flow_info ();
2934 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2935 if we must exit rest_of_compilation upon return. */
2937 rest_of_handle_inlining (tree decl
)
2944 /* If we are reconsidering an inline function at the end of
2945 compilation, skip the stuff for making it inline. */
2946 if (DECL_SAVED_INSNS (decl
) != 0)
2949 /* If this is nested inside an inlined external function, pretend
2950 it was only declared. Since we cannot inline such functions,
2951 generating code for this one is not only not necessary but will
2952 confuse some debugging output writers. */
2953 for (parent
= DECL_CONTEXT (current_function_decl
);
2954 parent
!= NULL_TREE
;
2955 parent
= get_containing_scope (parent
))
2956 if (TREE_CODE (parent
) == FUNCTION_DECL
2957 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2959 DECL_INITIAL (decl
) = 0;
2962 else if (TYPE_P (parent
))
2963 /* A function in a local class should be treated normally. */
2966 /* If requested, consider whether to make this function inline. */
2967 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2968 || flag_inline_functions
)
2970 timevar_push (TV_INTEGRATION
);
2971 lose
= function_cannot_inline_p (decl
);
2972 timevar_pop (TV_INTEGRATION
);
2973 if (lose
|| ! optimize
)
2975 if (warn_inline
&& DECL_INLINE (decl
))
2976 warning_with_decl (decl
, lose
);
2977 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2978 /* Don't really compile an extern inline function.
2979 If we can't make it inline, pretend
2980 it was only declared. */
2981 if (DECL_EXTERNAL (decl
))
2983 DECL_INITIAL (decl
) = 0;
2988 /* ??? Note that we used to just make it look like if
2989 the "inline" keyword was specified when we decide
2990 to inline it (because of -finline-functions).
2991 garloff@suse.de, 2002-04-24: Add another flag to
2992 actually record this piece of information. */
2993 if (!DECL_INLINE (decl
))
2994 DID_INLINE_FUNC (decl
) = 1;
2995 inlinable
= DECL_INLINE (decl
) = 1;
2999 insns
= get_insns ();
3001 /* Dump the rtl code if we are dumping rtl. */
3003 if (open_dump_file (DFI_rtl
, decl
))
3005 if (DECL_SAVED_INSNS (decl
))
3006 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
3007 close_dump_file (DFI_rtl
, print_rtl
, insns
);
3010 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
3011 sorts of eh initialization. Delay this until after the
3012 initial rtl dump so that we can see the original nesting. */
3013 convert_from_eh_region_ranges ();
3015 /* If function is inline, and we don't yet know whether to
3016 compile it by itself, defer decision till end of compilation.
3017 wrapup_global_declarations will (indirectly) call
3018 rest_of_compilation again for those functions that need to
3019 be output. Also defer those functions that we are supposed
3023 || (DECL_INLINE (decl
)
3024 && flag_inline_functions
3025 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
3026 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
3027 && ! flag_keep_inline_functions
)
3028 || DECL_EXTERNAL (decl
))))
3029 DECL_DEFER_OUTPUT (decl
) = 1;
3031 if (DECL_INLINE (decl
))
3032 /* DWARF wants separate debugging info for abstract and
3033 concrete instances of all inline functions, including those
3034 declared inline but not inlined, and those inlined even
3035 though they weren't declared inline. Conveniently, that's
3036 what DECL_INLINE means at this point. */
3037 (*debug_hooks
->deferred_inline_function
) (decl
);
3039 if (DECL_DEFER_OUTPUT (decl
))
3041 /* If -Wreturn-type, we have to do a bit of compilation. We just
3042 want to call cleanup the cfg to figure out whether or not we can
3043 fall off the end of the function; we do the minimum amount of
3044 work necessary to make that safe. */
3045 if (warn_return_type
)
3047 int saved_optimize
= optimize
;
3050 rebuild_jump_labels (insns
);
3051 find_exception_handler_labels ();
3052 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3053 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
3054 optimize
= saved_optimize
;
3056 /* CFG is no longer maintained up-to-date. */
3057 free_bb_for_insn ();
3060 set_nothrow_function_flags ();
3061 if (current_function_nothrow
)
3062 /* Now we know that this can't throw; set the flag for the benefit
3063 of other functions later in this translation unit. */
3064 TREE_NOTHROW (current_function_decl
) = 1;
3066 timevar_push (TV_INTEGRATION
);
3067 save_for_inline (decl
);
3068 timevar_pop (TV_INTEGRATION
);
3069 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
3073 /* If specified extern inline but we aren't inlining it, we are
3074 done. This goes for anything that gets here with DECL_EXTERNAL
3075 set, not just things with DECL_INLINE. */
3076 return (bool) DECL_EXTERNAL (decl
);
3079 /* Rest of compilation helper to convert the rtl to SSA form. */
3081 rest_of_handle_ssa (tree decl
, rtx insns
)
3083 timevar_push (TV_TO_SSA
);
3084 open_dump_file (DFI_ssa
, decl
);
3086 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3089 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3090 timevar_pop (TV_TO_SSA
);
3092 /* Perform sparse conditional constant propagation, if requested. */
3095 timevar_push (TV_SSA_CCP
);
3096 open_dump_file (DFI_ssa_ccp
, decl
);
3100 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
3101 timevar_pop (TV_SSA_CCP
);
3104 /* It would be useful to cleanup the CFG at this point, but block
3105 merging and possibly other transformations might leave a PHI
3106 node in the middle of a basic block, which is a strict no-no. */
3108 /* The SSA implementation uses basic block numbers in its phi
3109 nodes. Thus, changing the control-flow graph or the basic
3110 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3111 may cause problems. */
3115 /* Remove dead code. */
3117 timevar_push (TV_SSA_DCE
);
3118 open_dump_file (DFI_ssa_dce
, decl
);
3120 insns
= get_insns ();
3121 ssa_eliminate_dead_code ();
3123 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
3124 timevar_pop (TV_SSA_DCE
);
3127 /* Convert from SSA form. */
3129 timevar_push (TV_FROM_SSA
);
3130 open_dump_file (DFI_ussa
, decl
);
3132 convert_from_ssa ();
3133 /* New registers have been created. Rescan their usage. */
3134 reg_scan (insns
, max_reg_num (), 1);
3136 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3137 timevar_pop (TV_FROM_SSA
);
3144 /* Try to identify useless null pointer tests and delete them. */
3146 rest_of_handle_null_pointer (tree decl
, rtx insns
)
3148 open_dump_file (DFI_null
, decl
);
3150 dump_flow_info (rtl_dump_file
);
3152 if (delete_null_pointer_checks (insns
))
3153 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3155 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
3158 /* Try combining insns through substitution. */
3160 rest_of_handle_combine (tree decl
, rtx insns
)
3162 int rebuild_jump_labels_after_combine
= 0;
3164 timevar_push (TV_COMBINE
);
3165 open_dump_file (DFI_combine
, decl
);
3167 rebuild_jump_labels_after_combine
3168 = combine_instructions (insns
, max_reg_num ());
3170 /* Combining insns may have turned an indirect jump into a
3171 direct jump. Rebuild the JUMP_LABEL fields of jumping
3173 if (rebuild_jump_labels_after_combine
)
3175 timevar_push (TV_JUMP
);
3176 rebuild_jump_labels (insns
);
3177 timevar_pop (TV_JUMP
);
3179 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3182 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3183 timevar_pop (TV_COMBINE
);
3188 /* Perform life analysis. */
3190 rest_of_handle_life (tree decl
, rtx insns
)
3192 open_dump_file (DFI_life
, decl
);
3195 #ifdef ENABLE_CHECKING
3196 verify_flow_info ();
3198 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3200 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
3201 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3202 timevar_pop (TV_FLOW
);
3204 if (warn_uninitialized
)
3206 uninitialized_vars_warning (DECL_INITIAL (decl
));
3208 setjmp_args_warning ();
3213 if (!flag_new_regalloc
&& initialize_uninitialized_subregs ())
3215 /* Insns were inserted, and possibly pseudos created, so
3216 things might look a bit different. */
3217 insns
= get_insns ();
3218 allocate_reg_life_data ();
3219 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3220 PROP_LOG_LINKS
| PROP_REG_INFO
| PROP_DEATH_NOTES
);
3226 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3231 /* Perform common subexpression elimination. Nonzero value from
3232 `cse_main' means that jumps were simplified and some code may now
3233 be unreachable, so do jump optimization again. */
3235 rest_of_handle_cse (tree decl
, rtx insns
)
3239 open_dump_file (DFI_cse
, decl
);
3241 dump_flow_info (rtl_dump_file
);
3242 timevar_push (TV_CSE
);
3244 reg_scan (insns
, max_reg_num (), 1);
3246 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3248 rebuild_jump_labels (insns
);
3249 purge_all_dead_edges (0);
3251 delete_trivially_dead_insns (insns
, max_reg_num ());
3253 /* If we are not running more CSE passes, then we are no longer
3254 expecting CSE to be run. But always rerun it in a cheap mode. */
3255 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3257 if (tem
|| optimize
> 1)
3258 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3259 /* Try to identify useless null pointer tests and delete them. */
3260 if (flag_delete_null_pointer_checks
)
3262 timevar_push (TV_JUMP
);
3264 if (delete_null_pointer_checks (insns
))
3265 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3266 timevar_pop (TV_JUMP
);
3269 /* The second pass of jump optimization is likely to have
3270 removed a bunch more instructions. */
3271 renumber_insns (rtl_dump_file
);
3273 timevar_pop (TV_CSE
);
3274 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
3277 /* Run second CSE pass after loop optimizations. */
3279 rest_of_handle_cse2 (tree decl
, rtx insns
)
3283 timevar_push (TV_CSE2
);
3284 open_dump_file (DFI_cse2
, decl
);
3286 dump_flow_info (rtl_dump_file
);
3287 /* CFG is no longer maintained up-to-date. */
3288 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3289 purge_all_dead_edges (0);
3290 delete_trivially_dead_insns (insns
, max_reg_num ());
3294 timevar_push (TV_JUMP
);
3295 rebuild_jump_labels (insns
);
3296 cleanup_cfg (CLEANUP_EXPENSIVE
);
3297 timevar_pop (TV_JUMP
);
3299 reg_scan (insns
, max_reg_num (), 0);
3300 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
3302 timevar_pop (TV_CSE2
);
3305 /* Perform global cse. */
3307 rest_of_handle_gcse (tree decl
, rtx insns
)
3309 int save_csb
, save_cfj
;
3312 timevar_push (TV_GCSE
);
3313 open_dump_file (DFI_gcse
, decl
);
3315 tem
= gcse_main (insns
, rtl_dump_file
);
3316 rebuild_jump_labels (insns
);
3317 delete_trivially_dead_insns (insns
, max_reg_num ());
3319 save_csb
= flag_cse_skip_blocks
;
3320 save_cfj
= flag_cse_follow_jumps
;
3321 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3323 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
3324 if (current_function_calls_constant_p
)
3325 purge_builtin_constant_p ();
3327 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3329 if (flag_expensive_optimizations
)
3331 timevar_push (TV_CSE
);
3332 reg_scan (insns
, max_reg_num (), 1);
3333 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3334 purge_all_dead_edges (0);
3335 delete_trivially_dead_insns (insns
, max_reg_num ());
3336 timevar_pop (TV_CSE
);
3337 cse_not_expected
= !flag_rerun_cse_after_loop
;
3340 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3341 things up. Then possibly re-run CSE again. */
3345 timevar_push (TV_JUMP
);
3346 rebuild_jump_labels (insns
);
3347 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3348 timevar_pop (TV_JUMP
);
3350 if (flag_expensive_optimizations
)
3352 timevar_push (TV_CSE
);
3353 reg_scan (insns
, max_reg_num (), 1);
3354 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3355 purge_all_dead_edges (0);
3356 delete_trivially_dead_insns (insns
, max_reg_num ());
3357 timevar_pop (TV_CSE
);
3361 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
3362 timevar_pop (TV_GCSE
);
3365 flag_cse_skip_blocks
= save_csb
;
3366 flag_cse_follow_jumps
= save_cfj
;
3367 #ifdef ENABLE_CHECKING
3368 verify_flow_info ();
3372 /* Move constant computations out of loops. */
3374 rest_of_handle_loop_optimize (tree decl
, rtx insns
)
3376 int do_unroll
, do_prefetch
;
3378 timevar_push (TV_LOOP
);
3379 delete_dead_jumptables ();
3380 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3381 open_dump_file (DFI_loop
, decl
);
3383 /* CFG is no longer maintained up-to-date. */
3384 free_bb_for_insn ();
3386 if (flag_unroll_loops
)
3387 do_unroll
= 0; /* Having two unrollers is useless. */
3389 do_unroll
= flag_old_unroll_loops
? LOOP_UNROLL
: LOOP_AUTO_UNROLL
;
3390 do_prefetch
= flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0;
3392 if (flag_rerun_loop_opt
)
3394 cleanup_barriers ();
3396 /* We only want to perform unrolling once. */
3397 loop_optimize (insns
, rtl_dump_file
, do_unroll
);
3400 /* The first call to loop_optimize makes some instructions
3401 trivially dead. We delete those instructions now in the
3402 hope that doing so will make the heuristics in loop work
3403 better and possibly speed up compilation. */
3404 delete_trivially_dead_insns (insns
, max_reg_num ());
3406 /* The regscan pass is currently necessary as the alias
3407 analysis code depends on this information. */
3408 reg_scan (insns
, max_reg_num (), 1);
3410 cleanup_barriers ();
3411 loop_optimize (insns
, rtl_dump_file
, do_unroll
| LOOP_BCT
| do_prefetch
);
3413 /* Loop can create trivially dead instructions. */
3414 delete_trivially_dead_insns (insns
, max_reg_num ());
3415 close_dump_file (DFI_loop
, print_rtl
, insns
);
3416 timevar_pop (TV_LOOP
);
3417 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3422 /* Perform loop optimalizations. It might be better to do them a bit
3423 sooner, but we want the profile feedback to work more
3426 rest_of_handle_loop2 (tree decl
, rtx insns
)
3428 struct loops
*loops
;
3429 timevar_push (TV_LOOP
);
3430 open_dump_file (DFI_loop2
, decl
);
3432 dump_flow_info (rtl_dump_file
);
3434 loops
= loop_optimizer_init (rtl_dump_file
);
3438 /* The optimalizations: */
3439 if (flag_unswitch_loops
)
3440 unswitch_loops (loops
);
3442 if (flag_peel_loops
|| flag_unroll_loops
)
3443 unroll_and_peel_loops (loops
,
3444 (flag_peel_loops
? UAP_PEEL
: 0) |
3445 (flag_unroll_loops
? UAP_UNROLL
: 0) |
3446 (flag_unroll_all_loops
? UAP_UNROLL_ALL
: 0));
3448 loop_optimizer_finalize (loops
, rtl_dump_file
);
3451 cleanup_cfg (CLEANUP_EXPENSIVE
);
3452 delete_trivially_dead_insns (insns
, max_reg_num ());
3453 reg_scan (insns
, max_reg_num (), 0);
3455 dump_flow_info (rtl_dump_file
);
3456 close_dump_file (DFI_loop2
, print_rtl_with_bb
, get_insns ());
3457 timevar_pop (TV_LOOP
);
3461 /* This is called from finish_function (within langhooks.parse_file)
3462 after each top-level definition is parsed.
3463 It is supposed to compile that function or variable
3464 and output the assembler code for it.
3465 After we return, the tree storage is freed. */
3468 rest_of_compilation (tree decl
)
3471 int rebuild_label_notes_after_reload
;
3473 timevar_push (TV_REST_OF_COMPILATION
);
3475 /* Register rtl specific functions for cfg. */
3476 rtl_register_cfg_hooks ();
3478 /* Now that we're out of the frontend, we shouldn't have any more
3479 CONCATs anywhere. */
3480 generating_concat_p
= 0;
3482 /* When processing delayed functions, prepare_function_start() won't
3483 have been run to re-initialize it. */
3484 cse_not_expected
= ! optimize
;
3486 /* First, make sure that NOTE_BLOCK is set correctly for each
3487 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3488 if (!cfun
->x_whole_function_mode_p
)
3491 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3492 tree in sensible shape. So, we just recalculate it here. */
3493 if (cfun
->x_whole_function_mode_p
)
3498 if (rest_of_handle_inlining (decl
))
3499 goto exit_rest_of_compilation
;
3501 /* If we're emitting a nested function, make sure its parent gets
3502 emitted as well. Doing otherwise confuses debug info. */
3505 for (parent
= DECL_CONTEXT (current_function_decl
);
3506 parent
!= NULL_TREE
;
3507 parent
= get_containing_scope (parent
))
3508 if (TREE_CODE (parent
) == FUNCTION_DECL
)
3509 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
3512 /* We are now committed to emitting code for this function. Do any
3513 preparation, such as emitting abstract debug info for the inline
3514 before it gets mangled by optimization. */
3515 if (DECL_INLINE (decl
))
3516 (*debug_hooks
->outlining_inline_function
) (decl
);
3518 /* Remove any notes we don't need. That will make iterating
3519 over the instruction sequence faster, and allow the garbage
3520 collector to reclaim the memory used by the notes. */
3521 remove_unnecessary_notes ();
3526 /* Initialize some variables used by the optimizers. */
3527 init_function_for_compilation ();
3529 if (! DECL_DEFER_OUTPUT (decl
))
3530 TREE_ASM_WRITTEN (decl
) = 1;
3532 /* Now that integrate will no longer see our rtl, we need not
3533 distinguish between the return value of this function and the
3534 return value of called functions. Also, we can remove all SETs
3535 of subregs of hard registers; they are only here because of
3536 integrate. Also, we can now initialize pseudos intended to
3537 carry magic hard reg data throughout the function. */
3538 rtx_equal_function_value_matters
= 0;
3539 purge_hard_subreg_sets (get_insns ());
3541 /* Early return if there were errors. We can run afoul of our
3542 consistency checks, and there's not really much point in fixing them.
3543 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3544 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
3545 || errorcount
|| sorrycount
)
3546 goto exit_rest_of_compilation
;
3548 timevar_push (TV_JUMP
);
3549 open_dump_file (DFI_sibling
, decl
);
3550 insns
= get_insns ();
3551 rebuild_jump_labels (insns
);
3552 find_exception_handler_labels ();
3553 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3555 delete_unreachable_blocks ();
3557 /* We have to issue these warnings now already, because CFG cleanups
3558 further down may destroy the required information. */
3559 check_function_return_warnings ();
3561 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3562 if (flag_guess_branch_prob
)
3564 timevar_push (TV_BRANCH_PROB
);
3565 note_prediction_to_br_prob ();
3566 timevar_pop (TV_BRANCH_PROB
);
3569 if (flag_optimize_sibling_calls
)
3570 rest_of_handle_sibling_calls (insns
);
3572 timevar_pop (TV_JUMP
);
3574 scope_to_insns_initialize ();
3575 /* Complete generation of exception handling code. */
3578 timevar_push (TV_JUMP
);
3579 open_dump_file (DFI_eh
, decl
);
3581 finish_eh_generation ();
3583 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
3584 timevar_pop (TV_JUMP
);
3587 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3588 generation, which might create new sets. */
3589 emit_initial_value_sets ();
3592 /* If we are doing position-independent code generation, now
3593 is the time to output special prologues and epilogues.
3594 We do not want to do this earlier, because it just clutters
3595 up inline functions with meaningless insns. */
3600 insns
= get_insns ();
3602 /* Copy any shared structure that should not be shared. */
3603 unshare_all_rtl (current_function_decl
, insns
);
3605 #ifdef SETJMP_VIA_SAVE_AREA
3606 /* This must be performed before virtual register instantiation.
3607 Please be aware the everything in the compiler that can look
3608 at the RTL up to this point must understand that REG_SAVE_AREA
3609 is just like a use of the REG contained inside. */
3610 if (current_function_calls_alloca
)
3611 optimize_save_area_alloca (insns
);
3614 /* Instantiate all virtual registers. */
3615 instantiate_virtual_regs (current_function_decl
, insns
);
3617 open_dump_file (DFI_jump
, decl
);
3619 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3620 are initialized and to compute whether control can drop off the end
3623 timevar_push (TV_JUMP
);
3624 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3625 before jump optimization switches branch directions. */
3626 if (flag_guess_branch_prob
)
3627 expected_value_to_br_prob ();
3629 reg_scan (insns
, max_reg_num (), 0);
3630 rebuild_jump_labels (insns
);
3631 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3632 delete_trivially_dead_insns (insns
, max_reg_num ());
3634 dump_flow_info (rtl_dump_file
);
3635 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
3636 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3640 free_bb_for_insn ();
3641 copy_loop_headers (insns
);
3642 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3644 purge_line_number_notes (insns
);
3646 timevar_pop (TV_JUMP
);
3647 close_dump_file (DFI_jump
, print_rtl
, insns
);
3649 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3650 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
3651 goto exit_rest_of_compilation
;
3653 /* Long term, this should probably move before the jump optimizer too,
3654 but I didn't want to disturb the rtl_dump_and_exit and related
3655 stuff at this time. */
3656 if (optimize
> 0 && flag_ssa
)
3657 insns
= rest_of_handle_ssa (decl
, insns
);
3659 timevar_push (TV_JUMP
);
3662 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3664 if (flag_delete_null_pointer_checks
)
3665 rest_of_handle_null_pointer (decl
, insns
);
3667 /* Jump optimization, and the removal of NULL pointer checks, may
3668 have reduced the number of instructions substantially. CSE, and
3669 future passes, allocate arrays whose dimensions involve the
3670 maximum instruction UID, so if we can reduce the maximum UID
3671 we'll save big on memory. */
3672 renumber_insns (rtl_dump_file
);
3673 timevar_pop (TV_JUMP
);
3675 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
3680 rest_of_handle_cse (decl
, insns
);
3682 rest_of_handle_addresof (decl
, insns
);
3689 rest_of_handle_gcse (decl
, insns
);
3691 if (flag_loop_optimize
)
3692 rest_of_handle_loop_optimize (decl
, insns
);
3695 rest_of_handle_jump_bypass (decl
, insns
);
3698 timevar_push (TV_FLOW
);
3700 rest_of_handle_cfg (decl
, insns
);
3703 || profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3704 rest_of_handle_branch_prob (decl
, insns
);
3707 rest_of_handle_if_conversion (decl
, insns
);
3710 rest_of_handle_tracer (decl
, insns
);
3713 && (flag_unswitch_loops
3715 || flag_unroll_loops
))
3716 rest_of_handle_loop2 (decl
, insns
);
3718 if (flag_rerun_cse_after_loop
)
3719 rest_of_handle_cse2 (decl
, insns
);
3721 cse_not_expected
= 1;
3723 rest_of_handle_life (decl
, insns
);
3726 rest_of_handle_combine (decl
, insns
);
3728 if (flag_if_conversion
)
3729 rest_of_handle_if_after_combine (decl
, insns
);
3731 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3732 rest_of_handle_regmove (decl
, insns
);
3734 /* Do unconditional splitting before register allocation to allow machine
3735 description to add extra information not needed previously. */
3736 split_all_insns (1);
3738 #ifdef OPTIMIZE_MODE_SWITCHING
3739 timevar_push (TV_MODE_SWITCH
);
3742 optimize_mode_switching (NULL
);
3745 timevar_pop (TV_MODE_SWITCH
);
3748 /* Any of the several passes since flow1 will have munged register
3749 lifetime data a bit. We need it to be up to date for scheduling
3750 (see handling of reg_known_equiv in init_alias_analysis). */
3751 recompute_reg_usage (insns
, !optimize_size
);
3753 rest_of_handle_sched (decl
, insns
);
3755 /* Determine if the current function is a leaf before running reload
3756 since this can impact optimizations done by the prologue and
3757 epilogue thus changing register elimination offsets. */
3758 current_function_is_leaf
= leaf_function_p ();
3760 timevar_push (TV_LOCAL_ALLOC
);
3761 open_dump_file (DFI_lreg
, decl
);
3763 if (flag_new_regalloc
)
3765 if (rest_of_handle_new_regalloc (decl
, insns
,
3766 &rebuild_label_notes_after_reload
))
3767 goto exit_rest_of_compilation
;
3771 if (rest_of_handle_old_regalloc (decl
, insns
,
3772 &rebuild_label_notes_after_reload
))
3773 goto exit_rest_of_compilation
;
3778 open_dump_file (DFI_postreload
, decl
);
3780 /* Do a very simple CSE pass over just the hard registers. */
3783 timevar_push (TV_RELOAD_CSE_REGS
);
3784 reload_cse_regs (insns
);
3785 timevar_pop (TV_RELOAD_CSE_REGS
);
3788 /* Register allocation and reloading may have turned an indirect jump into
3789 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3790 jumping instructions. */
3791 if (rebuild_label_notes_after_reload
)
3793 timevar_push (TV_JUMP
);
3795 rebuild_jump_labels (insns
);
3796 purge_all_dead_edges (0);
3798 timevar_pop (TV_JUMP
);
3801 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3803 /* Re-create the death notes which were deleted during reload. */
3804 timevar_push (TV_FLOW2
);
3805 open_dump_file (DFI_flow2
, decl
);
3807 #ifdef ENABLE_CHECKING
3808 verify_flow_info ();
3811 /* If optimizing, then go ahead and split insns now. */
3815 split_all_insns (0);
3818 cleanup_cfg (CLEANUP_EXPENSIVE
);
3820 /* On some machines, the prologue and epilogue code, or parts thereof,
3821 can be represented as RTL. Doing so lets us schedule insns between
3822 it and the rest of the code and also allows delayed branch
3823 scheduling to operate in the epilogue. */
3824 thread_prologue_and_epilogue_insns (insns
);
3828 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3829 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3830 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3832 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3833 even for machines with possibly nonzero RETURN_POPS_ARGS
3834 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3835 push instructions will have popping returns. */
3836 #ifndef PUSH_ROUNDING
3837 if (!ACCUMULATE_OUTGOING_ARGS
)
3839 combine_stack_adjustments ();
3844 flow2_completed
= 1;
3846 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3847 timevar_pop (TV_FLOW2
);
3849 #ifdef HAVE_peephole2
3850 if (optimize
> 0 && flag_peephole2
)
3852 timevar_push (TV_PEEPHOLE2
);
3853 open_dump_file (DFI_peephole2
, decl
);
3855 peephole2_optimize (rtl_dump_file
);
3857 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3858 timevar_pop (TV_PEEPHOLE2
);
3864 if (flag_rename_registers
|| flag_cprop_registers
)
3865 rest_of_handle_regrename (decl
, insns
);
3867 rest_of_handle_reorder_blocks (decl
, insns
);
3870 if (flag_if_conversion2
)
3872 timevar_push (TV_IFCVT2
);
3873 open_dump_file (DFI_ce3
, decl
);
3877 close_dump_file (DFI_ce3
, print_rtl_with_bb
, insns
);
3878 timevar_pop (TV_IFCVT2
);
3881 #ifdef INSN_SCHEDULING
3882 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3883 rest_of_handle_sched2 (decl
, insns
);
3886 #ifdef LEAF_REGISTERS
3887 current_function_uses_only_leaf_regs
3888 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3892 rest_of_handle_stack_regs (decl
, insns
);
3895 compute_alignments ();
3897 /* CFG is no longer maintained up-to-date. */
3898 free_bb_for_insn ();
3900 if (targetm
.machine_dependent_reorg
!= 0)
3901 rest_of_handle_machine_reorg (decl
, insns
);
3903 purge_line_number_notes (insns
);
3904 cleanup_barriers ();
3907 if (optimize
> 0 && flag_delayed_branch
)
3908 rest_of_handle_delay_slots (decl
, insns
);
3911 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3912 timevar_push (TV_SHORTEN_BRANCH
);
3913 split_all_insns_noflow ();
3914 timevar_pop (TV_SHORTEN_BRANCH
);
3917 convert_to_eh_region_ranges ();
3919 /* Shorten branches. */
3920 timevar_push (TV_SHORTEN_BRANCH
);
3921 shorten_branches (get_insns ());
3922 timevar_pop (TV_SHORTEN_BRANCH
);
3924 set_nothrow_function_flags ();
3925 if (current_function_nothrow
)
3926 /* Now we know that this can't throw; set the flag for the benefit
3927 of other functions later in this translation unit. */
3928 TREE_NOTHROW (current_function_decl
) = 1;
3930 rest_of_handle_final (decl
, insns
);
3932 /* Write DBX symbols if requested. */
3934 /* Note that for those inline functions where we don't initially
3935 know for certain that we will be generating an out-of-line copy,
3936 the first invocation of this routine (rest_of_compilation) will
3937 skip over this code by doing a `goto exit_rest_of_compilation;'.
3938 Later on, wrapup_global_declarations will (indirectly) call
3939 rest_of_compilation again for those inline functions that need
3940 to have out-of-line copies generated. During that call, we
3941 *will* be routed past here. */
3943 timevar_push (TV_SYMOUT
);
3944 (*debug_hooks
->function_decl
) (decl
);
3945 timevar_pop (TV_SYMOUT
);
3947 exit_rest_of_compilation
:
3949 coverage_end_function ();
3951 /* In case the function was not output,
3952 don't leave any temporary anonymous types
3953 queued up for sdb output. */
3954 #ifdef SDB_DEBUGGING_INFO
3955 if (write_symbols
== SDB_DEBUG
)
3956 sdbout_types (NULL_TREE
);
3959 reload_completed
= 0;
3960 flow2_completed
= 0;
3963 timevar_push (TV_FINAL
);
3965 /* Clear out the insn_length contents now that they are no
3967 init_insn_lengths ();
3969 /* Show no temporary slots allocated. */
3972 free_basic_block_vars (0);
3973 free_bb_for_insn ();
3975 timevar_pop (TV_FINAL
);
3977 if ((*targetm
.binds_local_p
) (current_function_decl
))
3979 int pref
= cfun
->preferred_stack_boundary
;
3980 if (cfun
->recursive_call_emit
3981 && cfun
->stack_alignment_needed
> cfun
->preferred_stack_boundary
)
3982 pref
= cfun
->stack_alignment_needed
;
3983 cgraph_rtl_info (current_function_decl
)->preferred_incoming_stack_boundary
3987 /* Make sure volatile mem refs aren't considered valid operands for
3988 arithmetic insns. We must call this here if this is a nested inline
3989 function, since the above code leaves us in the init_recog state
3990 (from final.c), and the function context push/pop code does not
3991 save/restore volatile_ok.
3993 ??? Maybe it isn't necessary for expand_start_function to call this
3994 anymore if we do it here? */
3996 init_recog_no_volatile ();
3998 /* We're done with this function. Free up memory if we can. */
3999 free_after_parsing (cfun
);
4000 if (! DECL_DEFER_OUTPUT (decl
))
4002 free_after_compilation (cfun
);
4004 /* Clear integrate.c's pointer to the cfun structure we just
4006 DECL_SAVED_INSNS (decl
) = 0;
4012 timevar_pop (TV_REST_OF_COMPILATION
);
4015 /* Display help for generic options. */
4023 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
4024 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
4025 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
4026 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
4027 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
4028 printf (_(" -fdiagnostics-show-location=[once | every-line] Indicates how often source location information should be emitted, as prefix, at the beginning of diagnostics when line-wrapping\n"));
4029 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
4030 printf (_(" -fstack-limit-register=<register> Trap if the stack goes past <register>\n"));
4031 printf (_(" -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>\n"));
4032 printf (_(" -frandom-seed=<string> Make compile reproducible using <string>\n"));
4035 for (i
= ARRAY_SIZE (f_options
); i
--;)
4037 const char *description
= f_options
[i
].description
;
4039 if (description
!= NULL
&& *description
!= 0)
4040 printf (" -f%-21s %s\n",
4041 f_options
[i
].string
, _(description
));
4044 printf (_(" -O[number] Set optimization level to [number]\n"));
4045 printf (_(" -Os Optimize for space rather than speed\n"));
4046 for (i
= LAST_PARAM
; i
--;)
4048 const char *description
= compiler_params
[i
].help
;
4049 const int length
= 21 - strlen (compiler_params
[i
].option
);
4051 if (description
!= NULL
&& *description
!= 0)
4052 printf (" --param %s=<value>%.*s%s\n",
4053 compiler_params
[i
].option
,
4054 length
> 0 ? length
: 1, " ",
4057 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
4058 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
4059 printf (_(" -w Suppress warnings\n"));
4061 for (i
= ARRAY_SIZE (W_options
); i
--;)
4063 const char *description
= W_options
[i
].description
;
4065 if (description
!= NULL
&& *description
!= 0)
4066 printf (" -W%-21s %s\n",
4067 W_options
[i
].string
, _(description
));
4070 printf (_(" -Wextra Print extra (possibly unwanted) warnings\n"));
4071 printf (_(" -Wunused Enable unused warnings\n"));
4072 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
4073 printf (_(" -p Enable function profiling\n"));
4074 printf (_(" -o <file> Place output into <file> \n"));
4076 -G <number> Put global and static data smaller than <number>\n\
4077 bytes into a special section (on some targets)\n"));
4079 for (i
= ARRAY_SIZE (debug_args
); i
--;)
4081 if (debug_args
[i
].description
!= NULL
)
4082 printf (" -g%-21s %s\n",
4083 debug_args
[i
].arg
, _(debug_args
[i
].description
));
4086 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
4087 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
4088 printf (_(" -version Display the compiler's version\n"));
4089 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
4090 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
4091 #if defined INSN_SCHEDULING
4092 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
4094 printf (_(" --help Display this information\n"));
4099 /* Display descriptions of language specific options.
4100 If there is no description, note that there is an undocumented option.
4101 If the description is empty, do not display anything. (This allows
4102 options to be deliberately undocumented, for whatever reason).
4103 If the option string is missing, then this is a marker, indicating
4104 that the description string is in fact the name of a language, whose
4105 language specific options are to follow. */
4107 if (ARRAY_SIZE (documented_lang_options
) > 1)
4109 printf (_("\nLanguage specific options:\n"));
4111 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
4113 const char *description
= documented_lang_options
[i
].description
;
4114 const char *option
= documented_lang_options
[i
].option
;
4116 if (description
== NULL
)
4121 printf (_(" %-23.23s [undocumented]\n"), option
);
4123 else if (*description
== 0)
4125 else if (option
== NULL
)
4129 (_("\nThere are undocumented %s specific options as well.\n"),
4133 printf (_("\n Options for %s:\n"), description
);
4138 printf (" %-23.23s %s\n", option
, _(description
));
4143 printf (_("\nThere are undocumented %s specific options as well.\n"),
4146 display_target_options ();
4149 /* Display help for target options. */
4151 display_target_options (void)
4154 static bool displayed
= false;
4156 /* Avoid double printing for --help --target-help. */
4161 if (ARRAY_SIZE (target_switches
) > 1
4162 #ifdef TARGET_OPTIONS
4163 || ARRAY_SIZE (target_options
) > 1
4171 printf (_("\nTarget specific options:\n"));
4173 for (i
= ARRAY_SIZE (target_switches
); i
--;)
4175 const char *option
= target_switches
[i
].name
;
4176 const char *description
= target_switches
[i
].description
;
4178 if (option
== NULL
|| *option
== 0)
4180 else if (description
== NULL
)
4185 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4187 else if (*description
!= 0)
4188 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4191 #ifdef TARGET_OPTIONS
4192 for (i
= ARRAY_SIZE (target_options
); i
--;)
4194 const char *option
= target_options
[i
].prefix
;
4195 const char *description
= target_options
[i
].description
;
4197 if (option
== NULL
|| *option
== 0)
4199 else if (description
== NULL
)
4204 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4206 else if (*description
!= 0)
4207 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4213 printf (_("\nThere are undocumented target specific options as well.\n"));
4215 printf (_(" They exist, but they are not documented.\n"));
4220 /* Parse a -d... command line switch. */
4223 decode_d_option (const char *arg
)
4231 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4232 dump_file
[i
].enabled
= 1;
4238 flag_print_asm_name
= 1;
4241 flag_dump_rtl_in_asm
= 1;
4242 flag_print_asm_name
= 1;
4245 graph_dump_format
= vcg
;
4248 rtl_dump_and_exit
= 1;
4253 case 'D': /* These are handled by the preprocessor. */
4257 setup_core_dumping();
4262 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4263 if (c
== dump_file
[i
].debug_switch
)
4265 dump_file
[i
].enabled
= 1;
4270 warning ("unrecognized gcc debugging option: %c", c
);
4275 /* Parse a -f... command line switch. ARG is the value after the -f.
4276 It is safe to access 'ARG - 2' to generate the full switch name.
4277 Return the number of strings consumed. */
4280 decode_f_option (const char *arg
)
4283 const char *option_value
= NULL
;
4285 /* Search for the option in the table of binary f options. */
4286 for (j
= ARRAY_SIZE (f_options
); j
--;)
4288 if (!strcmp (arg
, f_options
[j
].string
))
4290 *f_options
[j
].variable
= f_options
[j
].on_value
;
4294 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4295 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4297 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4302 if (!strcmp (arg
, "fast-math"))
4303 set_fast_math_flags (1);
4304 else if (!strcmp (arg
, "no-fast-math"))
4305 set_fast_math_flags (0);
4306 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4307 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4310 read_integral_parameter (option_value
, arg
- 2,
4312 set_param_value ("max-inline-insns", val
);
4313 set_param_value ("max-inline-insns-single", val
/2);
4314 set_param_value ("max-inline-insns-auto", val
/2);
4315 set_param_value ("max-inline-insns-rtl", val
);
4316 if (val
/4 < MIN_INLINE_INSNS
)
4319 set_param_value ("min-inline-insns", val
/4);
4321 set_param_value ("min-inline-insns", 10);
4324 else if ((option_value
= skip_leading_substring (arg
, "tls-model=")))
4326 if (strcmp (option_value
, "global-dynamic") == 0)
4327 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
4328 else if (strcmp (option_value
, "local-dynamic") == 0)
4329 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
4330 else if (strcmp (option_value
, "initial-exec") == 0)
4331 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
4332 else if (strcmp (option_value
, "local-exec") == 0)
4333 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
4335 warning ("`%s': unknown tls-model option", arg
- 2);
4337 #ifdef INSN_SCHEDULING
4338 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4339 fix_sched_param ("verbose", option_value
);
4341 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4342 fix_register (option_value
, 1, 1);
4343 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4344 fix_register (option_value
, 0, 1);
4345 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4346 fix_register (option_value
, 0, 0);
4347 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4348 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4349 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4351 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4352 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4353 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4354 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4356 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4357 else if ((option_value
4358 = skip_leading_substring (arg
, "stack-limit-register=")))
4360 int reg
= decode_reg_name (option_value
);
4362 error ("unrecognized register name `%s'", option_value
);
4364 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4366 else if ((option_value
4367 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4370 nm
= ggc_strdup (option_value
);
4371 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4373 else if ((option_value
4374 = skip_leading_substring (arg
, "message-length=")))
4375 output_set_maximum_length
4376 (&global_dc
->buffer
, read_integral_parameter
4377 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4378 else if ((option_value
4379 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4381 if (!strcmp (option_value
, "once"))
4382 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4383 else if (!strcmp (option_value
, "every-line"))
4384 diagnostic_prefixing_rule (global_dc
)
4385 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4387 error ("unrecognized option `%s'", arg
- 2);
4389 else if (!strcmp (arg
, "no-stack-limit"))
4390 stack_limit_rtx
= NULL_RTX
;
4391 else if ((option_value
= skip_leading_substring (arg
, "random-seed=")))
4392 flag_random_seed
= option_value
;
4393 else if (!strcmp (arg
, "no-random-seed"))
4394 flag_random_seed
= NULL
;
4395 else if (!strcmp (arg
, "preprocessed"))
4396 /* Recognize this switch but do nothing. This prevents warnings
4397 about an unrecognized switch if cpplib has not been linked in. */
4405 /* Parse a -W... command line switch. ARG is the value after the -W.
4406 It is safe to access 'ARG - 2' to generate the full switch name.
4407 Return the number of strings consumed. */
4410 decode_W_option (const char *arg
)
4412 const char *option_value
= NULL
;
4415 /* Search for the option in the table of binary W options. */
4417 for (j
= ARRAY_SIZE (W_options
); j
--;)
4419 if (!strcmp (arg
, W_options
[j
].string
))
4421 *W_options
[j
].variable
= W_options
[j
].on_value
;
4425 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4426 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4428 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4433 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4434 warning ("-Wid-clash-LEN is no longer supported");
4435 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4437 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4439 warn_larger_than
= larger_than_size
!= -1;
4441 else if (!strcmp (arg
, "unused"))
4445 else if (!strcmp (arg
, "no-unused"))
4449 else if (!strcmp (arg
, "extra"))
4453 else if (!strcmp (arg
, "no-extra"))
4463 /* Indexed by enum debug_info_type. */
4464 const char *const debug_type_names
[] =
4466 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4469 /* Parse a -g... command line switch. ARG is the value after the -g.
4470 It is safe to access 'ARG - 2' to generate the full switch name.
4471 Return the number of strings consumed. */
4474 decode_g_option (const char *arg
)
4476 static unsigned level
= 0;
4477 /* A lot of code assumes write_symbols == NO_DEBUG if the
4478 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4479 of what debugging type has been selected). This records the
4480 selected type. It is an error to specify more than one
4482 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4483 /* Nonzero if debugging format has been explicitly set.
4484 -g and -ggdb don't explicitly set the debugging format so
4485 -gdwarf -g3 is equivalent to -gdwarf3. */
4486 static int type_explicitly_set_p
= 0;
4488 /* The maximum admissible debug level value. */
4489 static const unsigned max_debug_level
= 3;
4491 /* Look up ARG in the table. */
4492 for (da
= debug_args
; da
->arg
; da
++)
4494 const int da_len
= strlen (da
->arg
);
4496 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4498 enum debug_info_type type
= da
->debug_type
;
4499 const char *p
= arg
+ da_len
;
4501 if (*p
&& ! ISDIGIT (*p
))
4504 /* A debug flag without a level defaults to level 2.
4505 Note we do not want to call read_integral_parameter
4506 for that case since it will call atoi which
4509 ??? We may want to generalize the interface to
4510 read_integral_parameter to better handle this case
4511 if this case shows up often. */
4513 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4515 level
= (level
== 0) ? 2 : level
;
4517 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4519 error ("use -gdwarf -g%d for DWARF v1, level %d",
4522 error ("use -gdwarf-2 for DWARF v2");
4525 if (level
> max_debug_level
)
4528 ignoring option `%s' due to invalid debug level specification",
4530 level
= debug_info_level
;
4533 if (type
== NO_DEBUG
)
4535 type
= PREFERRED_DEBUGGING_TYPE
;
4537 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4539 #ifdef DWARF2_DEBUGGING_INFO
4540 type
= DWARF2_DEBUG
;
4542 #ifdef DBX_DEBUGGING_INFO
4549 if (type
== NO_DEBUG
)
4550 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4552 /* Does it conflict with an already selected type? */
4553 if (type_explicitly_set_p
4554 /* -g/-ggdb don't conflict with anything. */
4555 && da
->debug_type
!= NO_DEBUG
4556 && type
!= selected_debug_type
)
4557 warning ("`%s' ignored, conflicts with `-g%s'",
4558 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4561 /* If the format has already been set, -g/-ggdb
4562 only change the debug level. */
4563 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4564 /* Don't change debugging type. */
4568 selected_debug_type
= type
;
4569 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4572 write_symbols
= (level
== 0
4574 : selected_debug_type
);
4575 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4576 debug_info_level
= (enum debug_info_level
) level
;
4589 /* Decode the first argument in the argv as a language-independent option.
4590 Return the number of strings consumed. */
4593 independent_decode_option (int argc
, char **argv
)
4595 char *arg
= argv
[0];
4597 if (arg
[0] != '-' || arg
[1] == 0)
4609 if (!strcmp (arg
, "-help"))
4612 exit_after_options
= 1;
4616 if (!strcmp (arg
, "-target-help"))
4618 display_target_options ();
4619 exit_after_options
= 1;
4623 if (!strcmp (arg
, "-version"))
4625 print_version (stderr
, "");
4626 exit_after_options
= 1;
4630 /* Handle '--param <name>=<value>'. */
4631 if (strcmp (arg
, "-param") == 0)
4637 error ("-param option missing argument");
4641 /* Get the '<name>=<value>' parameter. */
4643 /* Look for the `='. */
4644 equal
= strchr (arg
, '=');
4646 error ("invalid --param option: %s", arg
);
4651 /* Zero out the `=' sign so that we get two separate strings. */
4653 /* Figure out what value is specified. */
4654 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4655 if (val
!= INVALID_PARAM_VAL
)
4656 set_param_value (arg
, val
);
4658 error ("invalid parameter value `%s'", equal
+ 1);
4670 /* Already been treated in main (). Do nothing. */
4674 set_target_switch (arg
+ 1);
4678 return decode_f_option (arg
+ 1);
4681 return decode_g_option (arg
+ 1);
4684 if (!strcmp (arg
, "dumpbase"))
4690 dump_base_name
= argv
[1];
4695 decode_d_option (arg
+ 1);
4699 if (!strcmp (arg
, "pedantic"))
4701 else if (!strcmp (arg
, "pedantic-errors"))
4702 flag_pedantic_errors
= pedantic
= 1;
4703 else if (arg
[1] == 0)
4710 if (!strcmp (arg
, "quiet"))
4717 if (!strcmp (arg
, "version"))
4725 inhibit_warnings
= 1;
4731 /* For backward compatibility, -W is the same as -Wextra. */
4735 return decode_W_option (arg
+ 1);
4739 if (!strncmp (arg
, "aux-info", 8))
4746 aux_info_file_name
= argv
[1];
4747 flag_gen_aux_info
= 1;
4750 else if (arg
[8] == '=')
4752 aux_info_file_name
= arg
+ 9;
4753 flag_gen_aux_info
= 1;
4758 else if (!strcmp (arg
, "auxbase"))
4764 aux_base_name
= argv
[1];
4768 else if (!strcmp (arg
, "auxbase-strip"))
4775 strip_off_ending (argv
[1], strlen (argv
[1]));
4777 aux_base_name
= argv
[1];
4792 asm_file_name
= argv
[1];
4807 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4812 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4816 if (g_switch_val
== -1)
4820 g_switch_set
= TRUE
;
4821 g_switch_value
= g_switch_val
;
4831 /* Decode -m switches. */
4832 /* Decode the switch -mNAME. */
4835 set_target_switch (const char *name
)
4838 int valid_target_option
= 0;
4840 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4841 if (!strcmp (target_switches
[j
].name
, name
))
4843 if (target_switches
[j
].value
< 0)
4844 target_flags
&= ~-target_switches
[j
].value
;
4846 target_flags
|= target_switches
[j
].value
;
4849 if (target_switches
[j
].value
< 0)
4850 target_flags_explicit
|= -target_switches
[j
].value
;
4852 target_flags_explicit
|= target_switches
[j
].value
;
4854 valid_target_option
= 1;
4857 #ifdef TARGET_OPTIONS
4858 if (!valid_target_option
)
4859 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4861 int len
= strlen (target_options
[j
].prefix
);
4862 if (target_options
[j
].value
)
4864 if (!strcmp (target_options
[j
].prefix
, name
))
4866 *target_options
[j
].variable
= target_options
[j
].value
;
4867 valid_target_option
= 1;
4872 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4874 *target_options
[j
].variable
= name
+ len
;
4875 valid_target_option
= 1;
4881 if (!valid_target_option
)
4882 error ("invalid option `%s'", name
);
4885 /* Print version information to FILE.
4886 Each line begins with INDENT (for the case where FILE is the
4887 assembler output file). */
4890 print_version (FILE *file
, const char *indent
)
4893 #define __VERSION__ "[?]"
4897 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4899 "%s%s%s version %s (%s) compiled by CC.\n"
4901 , indent
, *indent
!= 0 ? " " : "",
4902 lang_hooks
.name
, version_string
, TARGET_NAME
,
4903 indent
, __VERSION__
);
4904 fnotice (file
, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4905 indent
, *indent
!= 0 ? " " : "",
4906 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
4909 /* Print an option value and return the adjusted position in the line.
4910 ??? We don't handle error returns from fprintf (disk full); presumably
4911 other code will catch a disk full though. */
4914 print_single_switch (FILE *file
, int pos
, int max
,
4915 const char *indent
, const char *sep
, const char *term
,
4916 const char *type
, const char *name
)
4918 /* The ultrix fprintf returns 0 on success, so compute the result we want
4919 here since we need it for the following test. */
4920 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4925 fprintf (file
, "%s", term
);
4930 fprintf (file
, "%s", indent
);
4931 pos
= strlen (indent
);
4933 fprintf (file
, "%s%s%s", sep
, type
, name
);
4938 /* Print active target switches to FILE.
4939 POS is the current cursor position and MAX is the size of a "line".
4940 Each line begins with INDENT and ends with TERM.
4941 Each switch is separated from the next by SEP. */
4944 print_switch_values (FILE *file
, int pos
, int max
,
4945 const char *indent
, const char *sep
, const char *term
)
4950 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4951 that it can be printed below. This helps reproducibility. Of
4952 course, the string may never be used, but we can't tell that at
4953 this point in the compile. */
4954 default_flag_random_seed ();
4956 /* Print the options as passed. */
4958 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4959 _("options passed: "), "");
4961 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4965 if (strcmp (*p
, "-o") == 0)
4971 if (strcmp (*p
, "-quiet") == 0)
4973 if (strcmp (*p
, "-version") == 0)
4978 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4981 fprintf (file
, "%s", term
);
4983 /* Print the -f and -m options that have been enabled.
4984 We don't handle language specific options but printing argv
4987 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4988 _("options enabled: "), "");
4990 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4991 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4992 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4993 "-f", f_options
[j
].string
);
4995 /* Print target specific options. */
4997 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4998 if (target_switches
[j
].name
[0] != '\0'
4999 && target_switches
[j
].value
> 0
5000 && ((target_switches
[j
].value
& target_flags
)
5001 == target_switches
[j
].value
))
5003 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5004 "-m", target_switches
[j
].name
);
5007 #ifdef TARGET_OPTIONS
5008 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5009 if (*target_options
[j
].variable
!= NULL
)
5012 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5013 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5014 prefix
, *target_options
[j
].variable
);
5018 fprintf (file
, "%s", term
);
5021 /* Open assembly code output file. Do this even if -fsyntax-only is
5022 on, because then the driver will have provided the name of a
5023 temporary file or bit bucket for us. NAME is the file specified on
5024 the command line, possibly NULL. */
5026 init_asm_output (const char *name
)
5028 if (name
== NULL
&& asm_file_name
== 0)
5029 asm_out_file
= stdout
;
5032 if (asm_file_name
== 0)
5034 int len
= strlen (dump_base_name
);
5035 char *dumpname
= (char *) xmalloc (len
+ 6);
5036 memcpy (dumpname
, dump_base_name
, len
+ 1);
5037 strip_off_ending (dumpname
, len
);
5038 strcat (dumpname
, ".s");
5039 asm_file_name
= dumpname
;
5041 if (!strcmp (asm_file_name
, "-"))
5042 asm_out_file
= stdout
;
5044 asm_out_file
= fopen (asm_file_name
, "w+");
5045 if (asm_out_file
== 0)
5046 fatal_error ("can't open %s for writing: %m", asm_file_name
);
5049 #ifdef IO_BUFFER_SIZE
5050 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
5051 _IOFBF
, IO_BUFFER_SIZE
);
5054 if (!flag_syntax_only
)
5056 #ifdef ASM_FILE_START
5057 ASM_FILE_START (asm_out_file
);
5060 #ifdef ASM_COMMENT_START
5061 if (flag_verbose_asm
)
5063 /* Print the list of options in effect. */
5064 print_version (asm_out_file
, ASM_COMMENT_START
);
5065 print_switch_values (asm_out_file
, 0, MAX_LINE
,
5066 ASM_COMMENT_START
, " ", "\n");
5067 /* Add a blank line here so it appears in assembler output but not
5069 fprintf (asm_out_file
, "\n");
5075 /* Initialization of the front end environment, before command line
5076 options are parsed. Signal handlers, internationalization etc.
5077 ARGV0 is main's argv[0]. */
5079 general_init (char *argv0
)
5083 p
= argv0
+ strlen (argv0
);
5084 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
5088 xmalloc_set_program_name (progname
);
5092 gcc_init_libintl ();
5094 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
5096 signal (SIGSEGV
, crash_signal
);
5099 signal (SIGILL
, crash_signal
);
5102 signal (SIGBUS
, crash_signal
);
5105 signal (SIGABRT
, crash_signal
);
5107 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
5108 signal (SIGIOT
, crash_signal
);
5111 signal (SIGFPE
, crash_signal
);
5114 /* Other host-specific signal setup. */
5115 (*host_hooks
.extra_signals
)();
5117 /* Initialize the diagnostics reporting machinery, so option parsing
5118 can give warnings and errors. */
5119 diagnostic_initialize (global_dc
);
5121 /* Initialize the garbage-collector, string pools and tree type hash
5128 /* Parse command line options and set default flag values, called
5129 after language-independent option-independent initialization. Do
5130 minimal options processing. Outputting diagnostics is OK, but GC
5131 and identifier hashtables etc. are not initialized yet.
5133 Return nonzero to suppress compiler back end initialization. */
5135 parse_options_and_default_flags (int argc
, char **argv
)
5139 /* Save in case md file wants to emit args as a comment. */
5143 /* Initialize register usage now so switches may override. */
5146 /* Register the language-independent parameters. */
5147 add_params (lang_independent_params
, LAST_PARAM
);
5149 /* This must be done after add_params but before argument processing. */
5150 init_ggc_heuristics();
5152 /* Perform language-specific options initialization. */
5153 (*lang_hooks
.init_options
) ();
5155 /* Scan to see what optimization level has been specified. That will
5156 determine the default value of many flags. */
5157 for (i
= 1; i
< argc
; i
++)
5159 if (!strcmp (argv
[i
], "-O"))
5164 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
5166 /* Handle -Os, -O2, -O3, -O69, ... */
5167 char *p
= &argv
[i
][2];
5169 if ((p
[0] == 's') && (p
[1] == 0))
5173 /* Optimizing for size forces optimize to be 2. */
5178 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
5179 if (optimize_val
!= -1)
5181 optimize
= optimize_val
;
5190 flag_merge_constants
= 0;
5196 flag_thread_jumps
= 1;
5198 flag_delayed_branch
= 1;
5200 #ifdef CAN_DEBUG_WITHOUT_FP
5201 flag_omit_frame_pointer
= 1;
5203 flag_guess_branch_prob
= 1;
5204 flag_cprop_registers
= 1;
5205 flag_loop_optimize
= 1;
5206 flag_crossjumping
= 1;
5207 flag_if_conversion
= 1;
5208 flag_if_conversion2
= 1;
5213 flag_optimize_sibling_calls
= 1;
5214 flag_cse_follow_jumps
= 1;
5215 flag_cse_skip_blocks
= 1;
5217 flag_expensive_optimizations
= 1;
5218 flag_strength_reduce
= 1;
5219 flag_rerun_cse_after_loop
= 1;
5220 flag_rerun_loop_opt
= 1;
5221 flag_caller_saves
= 1;
5224 #ifdef INSN_SCHEDULING
5225 flag_schedule_insns
= 1;
5226 flag_schedule_insns_after_reload
= 1;
5229 flag_strict_aliasing
= 1;
5230 flag_delete_null_pointer_checks
= 1;
5231 flag_reorder_blocks
= 1;
5232 flag_reorder_functions
= 1;
5237 flag_inline_functions
= 1;
5238 flag_rename_registers
= 1;
5239 flag_unswitch_loops
= 1;
5240 flag_unit_at_a_time
= 1;
5243 if (optimize
< 2 || optimize_size
)
5248 align_functions
= 1;
5250 /* Don't reorder blocks when optimizing for size because extra
5251 jump insns may be created; also barrier may create extra padding.
5253 More correctly we should have a block reordering mode that tried
5254 to minimize the combined size of all the jumps. This would more
5255 or less automatically remove extra jumps, but would also try to
5256 use more short jumps instead of long jumps. */
5257 flag_reorder_blocks
= 0;
5260 /* Initialize whether `char' is signed. */
5261 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
5262 #ifdef DEFAULT_SHORT_ENUMS
5263 /* Initialize how much space enums occupy, by default. */
5264 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
5267 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5270 set_target_switch ("");
5272 /* Unwind tables are always present in an ABI-conformant IA-64
5273 object file, so the default should be ON. */
5274 #ifdef IA64_UNWIND_INFO
5275 flag_unwind_tables
= IA64_UNWIND_INFO
;
5278 #ifdef OPTIMIZATION_OPTIONS
5279 /* Allow default optimizations to be specified on a per-machine basis. */
5280 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
5283 /* Perform normal command line switch decoding. */
5284 for (i
= 1; i
< argc
;)
5287 int indep_processed
;
5289 /* Give the language a chance to decode the option for itself. */
5290 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
5292 if (lang_processed
>= 0)
5293 /* Now see if the option also has a language independent meaning.
5294 Some options are both language specific and language independent,
5296 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
5299 lang_processed
= -lang_processed
;
5300 indep_processed
= 0;
5303 if (lang_processed
|| indep_processed
)
5304 i
+= MAX (lang_processed
, indep_processed
);
5307 const char *option
= NULL
;
5308 const char *lang
= NULL
;
5311 /* It is possible that the command line switch is not valid for the
5312 current language, but it is valid for another language. In order
5313 to be compatible with previous versions of the compiler (which
5314 did not issue an error message in this case) we check for this
5315 possibility here. If we do find a match, then if extra_warnings
5316 is set we generate a warning message, otherwise we will just
5317 ignore the option. */
5318 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
5320 option
= documented_lang_options
[j
].option
;
5323 lang
= documented_lang_options
[j
].description
;
5324 else if (! strncmp (argv
[i
], option
, strlen (option
)))
5328 if (j
!= ARRAY_SIZE (documented_lang_options
))
5332 warning ("ignoring command line option '%s'", argv
[i
]);
5335 ("(it is valid for %s but not the selected language)",
5339 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
5340 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
5342 error ("unrecognized option `%s'", argv
[i
]);
5349 flag_pic
= flag_pie
;
5350 if (flag_pic
&& !flag_pie
)
5353 if (flag_no_inline
== 2)
5356 flag_really_no_inline
= flag_no_inline
;
5358 /* Set flag_no_inline before the post_options () hook. The C front
5359 ends use it to determine tree inlining defaults. FIXME: such
5360 code should be lang-independent when all front ends use tree
5361 inlining, in which case it, and this condition, should be moved
5362 to the top of process_options() instead. */
5365 /* Inlining does not work if not optimizing,
5366 so force it not to be done. */
5370 /* The c_decode_option function and decode_option hook set
5371 this to `2' if -Wall is used, so we can avoid giving out
5372 lots of errors for people who don't realize what -Wall does. */
5373 if (warn_uninitialized
== 1)
5374 warning ("-Wuninitialized is not supported without -O");
5377 if (flag_really_no_inline
== 2)
5378 flag_really_no_inline
= flag_no_inline
;
5381 /* Process the options that have been parsed. */
5383 process_options (void)
5385 /* Allow the front end to perform consistency checks and do further
5386 initialization based on the command line options. This hook also
5387 sets the original filename if appropriate (e.g. foo.i -> foo.c)
5388 so we can correctly initialize debug output. */
5389 no_backend
= (*lang_hooks
.post_options
) (&filename
);
5390 main_input_filename
= input_filename
= filename
;
5392 #ifdef OVERRIDE_OPTIONS
5393 /* Some machines may reject certain combinations of options. */
5397 /* Set aux_base_name if not already set. */
5402 char *name
= xstrdup (lbasename (filename
));
5404 strip_off_ending (name
, strlen (name
));
5405 aux_base_name
= name
;
5408 aux_base_name
= "gccaux";
5410 /* Set up the align_*_log variables, defaulting them to 1 if they
5411 were still unset. */
5412 if (align_loops
<= 0) align_loops
= 1;
5413 if (align_loops_max_skip
> align_loops
|| !align_loops
)
5414 align_loops_max_skip
= align_loops
- 1;
5415 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
5416 if (align_jumps
<= 0) align_jumps
= 1;
5417 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
5418 align_jumps_max_skip
= align_jumps
- 1;
5419 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
5420 if (align_labels
<= 0) align_labels
= 1;
5421 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
5422 if (align_labels_max_skip
> align_labels
|| !align_labels
)
5423 align_labels_max_skip
= align_labels
- 1;
5424 if (align_functions
<= 0) align_functions
= 1;
5425 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
5427 /* Unrolling all loops implies that standard loop unrolling must also
5429 if (flag_unroll_all_loops
)
5430 flag_unroll_loops
= 1;
5432 if (flag_unroll_loops
)
5434 flag_old_unroll_loops
= 0;
5435 flag_old_unroll_all_loops
= 0;
5438 if (flag_old_unroll_all_loops
)
5439 flag_old_unroll_loops
= 1;
5441 /* Old loop unrolling requires that strength_reduction be on also. Silently
5442 turn on strength reduction here if it isn't already on. Also, the loop
5443 unrolling code assumes that cse will be run after loop, so that must
5444 be turned on also. */
5445 if (flag_old_unroll_loops
)
5447 flag_strength_reduce
= 1;
5448 flag_rerun_cse_after_loop
= 1;
5450 if (flag_unroll_loops
|| flag_peel_loops
)
5451 flag_rerun_cse_after_loop
= 1;
5453 if (flag_non_call_exceptions
)
5454 flag_asynchronous_unwind_tables
= 1;
5455 if (flag_asynchronous_unwind_tables
)
5456 flag_unwind_tables
= 1;
5458 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5460 if (flag_unit_at_a_time
&& ! lang_hooks
.callgraph
.expand_function
)
5461 flag_unit_at_a_time
= 0;
5463 /* Warn about options that are not supported on this machine. */
5464 #ifndef INSN_SCHEDULING
5465 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
5466 warning ("instruction scheduling not supported on this target machine");
5469 if (flag_delayed_branch
)
5470 warning ("this target machine does not have delayed branches");
5473 user_label_prefix
= USER_LABEL_PREFIX
;
5474 if (flag_leading_underscore
!= -1)
5476 /* If the default prefix is more complicated than "" or "_",
5477 issue a warning and ignore this option. */
5478 if (user_label_prefix
[0] == 0 ||
5479 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
5481 user_label_prefix
= flag_leading_underscore
? "_" : "";
5484 warning ("-f%sleading-underscore not supported on this target machine",
5485 flag_leading_underscore
? "" : "no-");
5488 /* If we are in verbose mode, write out the version and maybe all the
5489 option flags in use. */
5492 print_version (stderr
, "");
5494 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
5497 if (flag_syntax_only
)
5499 write_symbols
= NO_DEBUG
;
5503 /* Now we know write_symbols, set up the debug hooks based on it.
5504 By default we do nothing for debug output. */
5505 #if defined(DBX_DEBUGGING_INFO)
5506 if (write_symbols
== DBX_DEBUG
)
5507 debug_hooks
= &dbx_debug_hooks
;
5509 #if defined(XCOFF_DEBUGGING_INFO)
5510 if (write_symbols
== XCOFF_DEBUG
)
5511 debug_hooks
= &xcoff_debug_hooks
;
5513 #ifdef SDB_DEBUGGING_INFO
5514 if (write_symbols
== SDB_DEBUG
)
5515 debug_hooks
= &sdb_debug_hooks
;
5517 #ifdef DWARF_DEBUGGING_INFO
5518 if (write_symbols
== DWARF_DEBUG
)
5519 debug_hooks
= &dwarf_debug_hooks
;
5521 #ifdef DWARF2_DEBUGGING_INFO
5522 if (write_symbols
== DWARF2_DEBUG
)
5523 debug_hooks
= &dwarf2_debug_hooks
;
5525 #ifdef VMS_DEBUGGING_INFO
5526 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
5527 debug_hooks
= &vmsdbg_debug_hooks
;
5530 /* If auxiliary info generation is desired, open the output file.
5531 This goes in the same directory as the source file--unlike
5532 all the other output files. */
5533 if (flag_gen_aux_info
)
5535 aux_info_file
= fopen (aux_info_file_name
, "w");
5536 if (aux_info_file
== 0)
5537 fatal_error ("can't open %s: %m", aux_info_file_name
);
5540 if (! targetm
.have_named_sections
)
5542 if (flag_function_sections
)
5544 warning ("-ffunction-sections not supported for this target");
5545 flag_function_sections
= 0;
5547 if (flag_data_sections
)
5549 warning ("-fdata-sections not supported for this target");
5550 flag_data_sections
= 0;
5554 if (flag_function_sections
&& profile_flag
)
5556 warning ("-ffunction-sections disabled; it makes profiling impossible");
5557 flag_function_sections
= 0;
5560 #ifndef HAVE_prefetch
5561 if (flag_prefetch_loop_arrays
)
5563 warning ("-fprefetch-loop-arrays not supported for this target");
5564 flag_prefetch_loop_arrays
= 0;
5567 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
5569 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5570 flag_prefetch_loop_arrays
= 0;
5574 /* This combination of options isn't handled for i386 targets and doesn't
5575 make much sense anyway, so don't allow it. */
5576 if (flag_prefetch_loop_arrays
&& optimize_size
)
5578 warning ("-fprefetch-loop-arrays is not supported with -Os");
5579 flag_prefetch_loop_arrays
= 0;
5582 #ifndef OBJECT_FORMAT_ELF
5583 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5584 warning ("-ffunction-sections may affect debugging on some targets");
5587 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5588 if (flag_signaling_nans
)
5589 flag_trapping_math
= 1;
5592 /* Initialize the compiler back end. */
5596 /* init_emit_once uses reg_raw_mode and therefore must be called
5597 after init_regs which initialized reg_raw_mode. */
5599 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5600 || debug_info_level
== DINFO_LEVEL_VERBOSE
5601 #ifdef VMS_DEBUGGING_INFO
5602 /* Enable line number info for traceback */
5603 || debug_info_level
> DINFO_LEVEL_NONE
5605 || flag_test_coverage
5606 || warn_notreached
);
5607 init_fake_stack_mems ();
5611 init_function_once ();
5612 init_varasm_once ();
5614 /* The following initialization functions need to generate rtl, so
5615 provide a dummy function context for them. */
5616 init_dummy_function_start ();
5618 if (flag_caller_saves
)
5619 init_caller_save ();
5620 expand_dummy_function_end ();
5623 /* Language-dependent initialization. Returns nonzero on success. */
5625 lang_dependent_init (const char *name
)
5627 if (dump_base_name
== 0)
5628 dump_base_name
= name
? name
: "gccdump";
5630 /* Other front-end initialization. */
5631 if ((*lang_hooks
.init
) () == 0)
5634 init_asm_output (name
);
5636 /* These create various _DECL nodes, so need to be called after the
5637 front end is initialized. */
5641 /* The following initialization functions need to generate rtl, so
5642 provide a dummy function context for them. */
5643 init_dummy_function_start ();
5645 expand_dummy_function_end ();
5647 /* If dbx symbol table desired, initialize writing it and output the
5648 predefined types. */
5649 timevar_push (TV_SYMOUT
);
5651 #ifdef DWARF2_UNWIND_INFO
5652 if (dwarf2out_do_frame ())
5653 dwarf2out_frame_init ();
5656 /* Now we have the correct original filename, we can initialize
5658 (*debug_hooks
->init
) (name
);
5660 timevar_pop (TV_SYMOUT
);
5665 /* Clean up: close opened files, etc. */
5670 /* Close the dump files. */
5671 if (flag_gen_aux_info
)
5673 fclose (aux_info_file
);
5675 unlink (aux_info_file_name
);
5678 /* Close non-debugging input and output files. Take special care to note
5679 whether fclose returns an error, since the pages might still be on the
5680 buffer chain while the file is open. */
5684 if (ferror (asm_out_file
) != 0)
5685 fatal_error ("error writing to %s: %m", asm_file_name
);
5686 if (fclose (asm_out_file
) != 0)
5687 fatal_error ("error closing %s: %m", asm_file_name
);
5690 /* Do whatever is necessary to finish printing the graphs. */
5691 if (graph_dump_format
!= no_graph
)
5695 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5696 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5701 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5702 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5703 finish_graph_dump_file (dump_base_name
, suffix
);
5710 ggc_print_statistics ();
5711 stringpool_statistics ();
5712 dump_tree_statistics ();
5715 /* Free up memory for the benefit of leak detectors. */
5718 /* Language-specific end of compilation actions. */
5719 (*lang_hooks
.finish
) ();
5722 /* Initialize the compiler, and compile the input file. */
5726 /* Initialize timing first. The C front ends read the main file in
5727 the post_options hook, and C++ does file timings. */
5728 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
5730 timevar_start (TV_TOTAL
);
5734 /* Don't do any more if an error has already occurred. */
5737 /* Set up the back-end if requested. */
5741 /* Language-dependent initialization. Returns true on success. */
5742 if (lang_dependent_init (filename
))
5748 /* Stop timing and print the times. */
5749 timevar_stop (TV_TOTAL
);
5750 timevar_print (stderr
);
5753 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5754 Decode command args, then call compile_file.
5755 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5756 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5758 It is not safe to call this function more than once. */
5761 toplev_main (int argc
, char **argv
)
5763 /* Initialization of GCC's environment, and diagnostics. */
5764 general_init (argv
[0]);
5766 /* Parse the options and do minimal processing; basically just
5767 enough to default flags appropriately. */
5768 parse_options_and_default_flags (argc
, argv
);
5770 /* Exit early if we can (e.g. -help). */
5771 if (!exit_after_options
)
5774 if (errorcount
|| sorrycount
)
5775 return (FATAL_EXIT_CODE
);
5777 return (SUCCESS_EXIT_CODE
);