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"
81 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
82 #include "dwarf2out.h"
85 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
89 #ifdef SDB_DEBUGGING_INFO
93 #ifdef XCOFF_DEBUGGING_INFO
94 #include "xcoffout.h" /* Needed for external data
95 declarations for e.g. AIX 4.x. */
98 /* Carry information from ASM_DECLARE_OBJECT_NAME
99 to ASM_FINISH_DECLARE_OBJECT. */
101 extern int size_directive_output
;
102 extern tree last_assemble_variable_decl
;
104 extern void reg_alloc (void);
106 static void general_init (char *);
107 static void parse_options_and_default_flags (int, char **);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void set_target_switch (const char *);
117 static void crash_signal (int) ATTRIBUTE_NORETURN
;
118 static void setup_core_dumping (void);
119 static void compile_file (void);
120 static void display_help (void);
121 static void display_target_options (void);
123 static void decode_d_option (const char *);
124 static int decode_f_option (const char *);
125 static int decode_W_option (const char *);
126 static int decode_g_option (const char *);
127 static unsigned int independent_decode_option (int, char **);
128 static void set_Wextra (int);
130 static void print_version (FILE *, const char *);
131 static int print_single_switch (FILE *, int, int, const char *,
132 const char *, const char *,
133 const char *, const char *);
134 static void print_switch_values (FILE *, int, int, const char *,
135 const char *, const char *);
137 /* Rest of compilation helper functions. */
138 static bool rest_of_handle_inlining (tree
);
139 static rtx
rest_of_handle_ssa (tree
, rtx
);
140 static void rest_of_handle_cse (tree
, rtx
);
141 static void rest_of_handle_cse2 (tree
, rtx
);
142 static void rest_of_handle_gcse (tree
, rtx
);
143 static void rest_of_handle_life (tree
, rtx
);
144 static void rest_of_handle_loop_optimize (tree
, rtx
);
145 static void rest_of_handle_loop2 (tree
, rtx
);
146 static void rest_of_handle_jump_bypass (tree
, rtx
);
147 static void rest_of_handle_sibling_calls (rtx
);
148 static void rest_of_handle_null_pointer (tree
, rtx
);
149 static void rest_of_handle_addresof (tree
, rtx
);
150 static void rest_of_handle_cfg (tree
, rtx
);
151 static void rest_of_handle_branch_prob (tree
, rtx
);
152 static void rest_of_handle_if_conversion (tree
, rtx
);
153 static void rest_of_handle_if_after_combine (tree
, rtx
);
154 static void rest_of_handle_tracer (tree
, rtx
);
155 static void rest_of_handle_combine (tree
, rtx
);
156 static void rest_of_handle_regmove (tree
, rtx
);
157 static void rest_of_handle_sched (tree
, rtx
);
158 #ifdef INSN_SCHEDULING
159 static void rest_of_handle_sched2 (tree
, rtx
);
161 static bool rest_of_handle_new_regalloc (tree
, rtx
, int *);
162 static bool rest_of_handle_old_regalloc (tree
, rtx
, int *);
163 static void rest_of_handle_regrename (tree
, rtx
);
164 static void rest_of_handle_reorder_blocks (tree
, rtx
);
166 static void rest_of_handle_stack_regs (tree
, rtx
);
168 static void rest_of_handle_machine_reorg (tree
, rtx
);
170 static void rest_of_handle_delay_slots (tree
, rtx
);
172 static void rest_of_handle_final (tree
, rtx
);
174 /* Nonzero to dump debug info whilst parsing (-dy option). */
175 static int set_yydebug
;
177 /* True if we don't need a backend (e.g. preprocessing only). */
178 static bool no_backend
;
180 /* Length of line when printing switch values. */
183 /* Name of program invoked, sans directories. */
185 const char *progname
;
187 /* Copy of arguments to toplev_main. */
191 /* Name of top-level original source file (what was input to cpp).
192 This comes from the #-command at the beginning of the actual input.
193 If there isn't any there, then this is the cc1 input file name. */
195 const char *main_input_filename
;
197 /* Current position in real source file. */
199 location_t input_location
;
201 /* Nonzero if it is unsafe to create any new pseudo registers. */
204 /* Stack of currently pending input files. */
206 struct file_stack
*input_file_stack
;
208 /* Incremented on each change to input_file_stack. */
209 int input_file_stack_tick
;
211 /* Name to use as base of names for dump output files. */
213 const char *dump_base_name
;
215 /* Name to use as a base for auxiliary output files. */
217 static const char *aux_base_name
;
219 /* Format to use to print dumpfile index value */
220 #ifndef DUMPFILE_FORMAT
221 #define DUMPFILE_FORMAT ".%02d."
224 /* Bit flags that specify the machine subtype we are compiling for.
225 Bits are tested using macros TARGET_... defined in the tm.h file
226 and set by `-m...' switches. Must be defined in rtlanal.c. */
228 extern int target_flags
;
230 /* A mask of target_flags that includes bit X if X was set or cleared
231 on the command line. */
233 int target_flags_explicit
;
235 /* Debug hooks - dependent upon command line options. */
237 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
239 /* Describes a dump file. */
241 struct dump_file_info
243 /* The unique extension to apply, e.g. ".jump". */
244 const char *const extension
;
246 /* The -d<c> character that enables this dump file. */
247 char const debug_switch
;
249 /* True if there is a corresponding graph dump file. */
250 char const graph_dump_p
;
252 /* True if the user selected this dump. */
255 /* True if the files have been initialized (ie truncated). */
259 /* Enumerate the extant dump files. */
303 /* Describes all the dump files. Should be kept in order of the
304 pass and in sync with dump_file_index above.
306 Remaining -d letters:
312 static struct dump_file_info dump_file
[DFI_MAX
] =
314 { "rtl", 'r', 0, 0, 0 },
315 { "sibling", 'i', 0, 0, 0 },
316 { "eh", 'h', 0, 0, 0 },
317 { "jump", 'j', 0, 0, 0 },
318 { "ssa", 'e', 1, 0, 0 },
319 { "ssaccp", 'W', 1, 0, 0 },
320 { "ssadce", 'X', 1, 0, 0 },
321 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
322 { "null", 'u', 0, 0, 0 },
323 { "cse", 's', 0, 0, 0 },
324 { "addressof", 'F', 0, 0, 0 },
325 { "gcse", 'G', 1, 0, 0 },
326 { "loop", 'L', 1, 0, 0 },
327 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
328 { "cfg", 'f', 1, 0, 0 },
329 { "bp", 'b', 1, 0, 0 },
330 { "ce1", 'C', 1, 0, 0 },
331 { "tracer", 'T', 1, 0, 0 },
332 { "loop2", 'L', 1, 0, 0 },
333 { "cse2", 't', 1, 0, 0 },
334 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
335 { "combine", 'c', 1, 0, 0 },
336 { "ce2", 'C', 1, 0, 0 },
337 { "regmove", 'N', 1, 0, 0 },
338 { "sched", 'S', 1, 0, 0 },
339 { "lreg", 'l', 1, 0, 0 },
340 { "greg", 'g', 1, 0, 0 },
341 { "postreload", 'o', 1, 0, 0 },
342 { "flow2", 'w', 1, 0, 0 },
343 { "peephole2", 'z', 1, 0, 0 },
344 { "rnreg", 'n', 1, 0, 0 },
345 { "bbro", 'B', 1, 0, 0 },
346 { "ce3", 'E', 1, 0, 0 },
347 { "sched2", 'R', 1, 0, 0 },
348 { "stack", 'k', 1, 0, 0 },
349 { "mach", 'M', 1, 0, 0 },
350 { "dbr", 'd', 0, 0, 0 },
353 static int open_dump_file (enum dump_file_index
, tree
);
354 static void close_dump_file (enum dump_file_index
,
355 void (*) (FILE *, rtx
), rtx
);
357 /* Other flags saying which kinds of debugging dump have been requested. */
359 int rtl_dump_and_exit
;
360 int flag_print_asm_name
;
361 static int version_flag
;
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
);
2263 targetm
.asm_out
.file_end ();
2265 /* Attach a special .ident directive to the end of the file to identify
2266 the version of GCC which compiled this code. The format of the .ident
2267 string is patterned after the ones produced by native SVR4 compilers. */
2270 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2271 IDENT_ASM_OP
, version_string
);
2274 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2276 timevar_push (TV_DUMP
);
2277 dump_combine_total_stats (rtl_dump_file
);
2278 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2279 timevar_pop (TV_DUMP
);
2283 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2284 and TYPE_DECL nodes.
2286 This does nothing for local (non-static) variables, unless the
2287 variable is a register variable with an ASMSPEC. In that case, or
2288 if the variable is not an automatic, it sets up the RTL and
2289 outputs any assembler code (label definition, storage allocation
2290 and initialization).
2292 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2293 the assembler symbol name to be used. TOP_LEVEL is nonzero
2294 if this declaration is not within a function. */
2297 rest_of_decl_compilation (tree decl
,
2298 const char *asmspec
,
2302 /* We deferred calling assemble_alias so that we could collect
2303 other attributes such as visibility. Emit the alias now. */
2306 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2309 alias
= TREE_VALUE (TREE_VALUE (alias
));
2310 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2311 assemble_alias (decl
, alias
);
2315 /* Forward declarations for nested functions are not "external",
2316 but we need to treat them as if they were. */
2317 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2318 || TREE_CODE (decl
) == FUNCTION_DECL
)
2320 timevar_push (TV_VARCONST
);
2323 make_decl_rtl (decl
, asmspec
);
2325 /* Don't output anything when a tentative file-scope definition
2326 is seen. But at end of compilation, do output code for them. */
2327 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2328 assemble_variable (decl
, top_level
, at_end
, 0);
2330 #ifdef ASM_FINISH_DECLARE_OBJECT
2331 if (decl
== last_assemble_variable_decl
)
2333 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2338 timevar_pop (TV_VARCONST
);
2340 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2342 if (decode_reg_name (asmspec
) >= 0)
2344 SET_DECL_RTL (decl
, NULL_RTX
);
2345 make_decl_rtl (decl
, asmspec
);
2349 error ("invalid register name `%s' for register variable", asmspec
);
2350 DECL_REGISTER (decl
) = 0;
2355 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2356 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2357 && TREE_CODE (decl
) == TYPE_DECL
)
2359 timevar_push (TV_SYMOUT
);
2360 dbxout_symbol (decl
, 0);
2361 timevar_pop (TV_SYMOUT
);
2364 #ifdef SDB_DEBUGGING_INFO
2365 else if (write_symbols
== SDB_DEBUG
&& top_level
2366 && TREE_CODE (decl
) == TYPE_DECL
)
2368 timevar_push (TV_SYMOUT
);
2369 sdbout_symbol (decl
, 0);
2370 timevar_pop (TV_SYMOUT
);
2373 #ifdef DWARF2_DEBUGGING_INFO
2374 else if ((write_symbols
== DWARF2_DEBUG
2375 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2377 && TREE_CODE (decl
) == TYPE_DECL
)
2379 timevar_push (TV_SYMOUT
);
2380 dwarf2out_decl (decl
);
2381 timevar_pop (TV_SYMOUT
);
2386 /* Called after finishing a record, union or enumeral type. */
2389 rest_of_type_compilation (
2390 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2391 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2395 tree type ATTRIBUTE_UNUSED
,
2396 int toplev ATTRIBUTE_UNUSED
2400 /* Avoid confusing the debug information machinery when there are
2402 if (errorcount
!= 0 || sorrycount
!= 0)
2405 timevar_push (TV_SYMOUT
);
2406 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2407 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2408 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2410 #ifdef SDB_DEBUGGING_INFO
2411 if (write_symbols
== SDB_DEBUG
)
2412 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2414 #ifdef DWARF2_DEBUGGING_INFO
2415 if ((write_symbols
== DWARF2_DEBUG
2416 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2418 dwarf2out_decl (TYPE_STUB_DECL (type
));
2420 timevar_pop (TV_SYMOUT
);
2423 /* Turn the RTL into assembly. */
2425 rest_of_handle_final (tree decl
, rtx insns
)
2427 timevar_push (TV_FINAL
);
2432 /* Get the function's name, as described by its RTL. This may be
2433 different from the DECL_NAME name used in the source file. */
2435 x
= DECL_RTL (decl
);
2436 if (GET_CODE (x
) != MEM
)
2439 if (GET_CODE (x
) != SYMBOL_REF
)
2441 fnname
= XSTR (x
, 0);
2443 assemble_start_function (decl
, fnname
);
2444 final_start_function (insns
, asm_out_file
, optimize
);
2445 final (insns
, asm_out_file
, optimize
, 0);
2446 final_end_function ();
2448 #ifdef IA64_UNWIND_INFO
2449 /* ??? The IA-64 ".handlerdata" directive must be issued before
2450 the ".endp" directive that closes the procedure descriptor. */
2451 output_function_exception_table ();
2454 assemble_end_function (decl
, fnname
);
2456 #ifndef IA64_UNWIND_INFO
2457 /* Otherwise, it feels unclean to switch sections in the middle. */
2458 output_function_exception_table ();
2462 fflush (asm_out_file
);
2464 /* Release all memory allocated by flow. */
2465 free_basic_block_vars (0);
2467 /* Release all memory held by regsets now. */
2468 regset_release_memory ();
2470 timevar_pop (TV_FINAL
);
2476 /* Run delay slot optimization. */
2478 rest_of_handle_delay_slots (tree decl
, rtx insns
)
2480 timevar_push (TV_DBR_SCHED
);
2481 open_dump_file (DFI_dbr
, decl
);
2483 dbr_schedule (insns
, rtl_dump_file
);
2485 close_dump_file (DFI_dbr
, print_rtl
, insns
);
2486 timevar_pop (TV_DBR_SCHED
);
2493 /* Convert register usage from flat register file usage to a stack
2496 rest_of_handle_stack_regs (tree decl
, rtx insns
)
2498 timevar_push (TV_REG_STACK
);
2499 open_dump_file (DFI_stack
, decl
);
2501 if (reg_to_stack (insns
, rtl_dump_file
) && optimize
)
2503 if (cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
2504 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0))
2505 && flag_reorder_blocks
)
2507 reorder_basic_blocks ();
2508 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
2512 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
2513 timevar_pop (TV_REG_STACK
);
2520 /* Machine independent reorg pass. */
2522 rest_of_handle_machine_reorg (tree decl
, rtx insns
)
2524 timevar_push (TV_MACH_DEP
);
2525 open_dump_file (DFI_mach
, decl
);
2527 (*targetm
.machine_dependent_reorg
) ();
2529 close_dump_file (DFI_mach
, print_rtl
, insns
);
2530 timevar_pop (TV_MACH_DEP
);
2536 /* Run new register allocator. Return TRUE if we must exit
2537 rest_of_compilation upon return. */
2539 rest_of_handle_new_regalloc (tree decl
, rtx insns
, int *rebuild_notes
)
2543 delete_trivially_dead_insns (insns
, max_reg_num ());
2546 timevar_pop (TV_LOCAL_ALLOC
);
2547 if (dump_file
[DFI_lreg
].enabled
)
2549 timevar_push (TV_DUMP
);
2551 close_dump_file (DFI_lreg
, NULL
, NULL
);
2552 timevar_pop (TV_DUMP
);
2555 /* XXX clean up the whole mess to bring live info in shape again. */
2556 timevar_push (TV_GLOBAL_ALLOC
);
2557 open_dump_file (DFI_greg
, decl
);
2559 build_insn_chain (insns
);
2560 failure
= reload (insns
, 0);
2562 timevar_pop (TV_GLOBAL_ALLOC
);
2564 if (dump_file
[DFI_greg
].enabled
)
2566 timevar_push (TV_DUMP
);
2568 dump_global_regs (rtl_dump_file
);
2570 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2571 timevar_pop (TV_DUMP
);
2577 reload_completed
= 1;
2583 /* Run old register allocator. Return TRUE if we must exit
2584 rest_of_compilation upon return. */
2586 rest_of_handle_old_regalloc (tree decl
, rtx insns
, int *rebuild_notes
)
2590 /* Allocate the reg_renumber array. */
2591 allocate_reg_info (max_regno
, FALSE
, TRUE
);
2593 /* And the reg_equiv_memory_loc array. */
2594 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
2596 allocate_initial_values (reg_equiv_memory_loc
);
2598 regclass (insns
, max_reg_num (), rtl_dump_file
);
2599 *rebuild_notes
= local_alloc ();
2601 timevar_pop (TV_LOCAL_ALLOC
);
2603 if (dump_file
[DFI_lreg
].enabled
)
2605 timevar_push (TV_DUMP
);
2607 dump_flow_info (rtl_dump_file
);
2608 dump_local_alloc (rtl_dump_file
);
2610 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
2611 timevar_pop (TV_DUMP
);
2616 timevar_push (TV_GLOBAL_ALLOC
);
2617 open_dump_file (DFI_greg
, decl
);
2619 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2620 pass fixing up any insns that are invalid. */
2623 failure
= global_alloc (rtl_dump_file
);
2626 build_insn_chain (insns
);
2627 failure
= reload (insns
, 0);
2630 timevar_pop (TV_GLOBAL_ALLOC
);
2632 if (dump_file
[DFI_greg
].enabled
)
2634 timevar_push (TV_DUMP
);
2636 dump_global_regs (rtl_dump_file
);
2638 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2639 timevar_pop (TV_DUMP
);
2645 /* Run the regrename and cprop passes. */
2647 rest_of_handle_regrename (tree decl
, rtx insns
)
2649 timevar_push (TV_RENAME_REGISTERS
);
2650 open_dump_file (DFI_rnreg
, decl
);
2652 if (flag_rename_registers
)
2653 regrename_optimize ();
2654 if (flag_cprop_registers
)
2655 copyprop_hardreg_forward ();
2657 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
2658 timevar_pop (TV_RENAME_REGISTERS
);
2661 /* Reorder basic blocks. */
2663 rest_of_handle_reorder_blocks (tree decl
, rtx insns
)
2665 timevar_push (TV_REORDER_BLOCKS
);
2666 open_dump_file (DFI_bbro
, decl
);
2668 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2669 splitting possibly introduced more crossjumping opportunities. */
2670 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
2671 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
2673 if (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
)
2675 if (flag_reorder_blocks
)
2676 reorder_basic_blocks ();
2677 if (flag_reorder_blocks
2678 || (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
))
2679 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2681 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
2682 timevar_pop (TV_REORDER_BLOCKS
);
2685 /* Run instruction scheduler. */
2687 rest_of_handle_sched (tree decl
, rtx insns
)
2689 timevar_push (TV_SCHED
);
2690 #ifdef INSN_SCHEDULING
2692 /* Print function header into sched dump now
2693 because doing the sched analysis makes some of the dump. */
2694 if (optimize
> 0 && flag_schedule_insns
)
2696 open_dump_file (DFI_sched
, decl
);
2698 /* Do control and data sched analysis,
2699 and write some of the results to dump file. */
2701 schedule_insns (rtl_dump_file
);
2703 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
2706 timevar_pop (TV_SCHED
);
2711 #ifdef INSN_SCHEDULING
2712 /* Run second scheduling pass after reload. */
2714 rest_of_handle_sched2 (tree decl
, rtx insns
)
2716 timevar_push (TV_SCHED2
);
2717 open_dump_file (DFI_sched2
, decl
);
2719 /* Do control and data sched analysis again,
2720 and write some more of the results to dump file. */
2722 split_all_insns (1);
2724 if (flag_sched2_use_superblocks
|| flag_sched2_use_traces
)
2726 schedule_ebbs (rtl_dump_file
);
2727 /* No liveness updating code yet, but it should be easy to do.
2728 reg-stack recompute the liveness when needed for now. */
2729 count_or_remove_death_notes (NULL
, 1);
2730 cleanup_cfg (CLEANUP_EXPENSIVE
);
2733 schedule_insns (rtl_dump_file
);
2735 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
2736 timevar_pop (TV_SCHED2
);
2742 /* Register allocation pre-pass, to reduce number of moves necessary
2743 for two-address machines. */
2745 rest_of_handle_regmove (tree decl
, rtx insns
)
2747 timevar_push (TV_REGMOVE
);
2748 open_dump_file (DFI_regmove
, decl
);
2750 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
2752 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2753 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
2754 timevar_pop (TV_REGMOVE
);
2761 rest_of_handle_tracer (tree decl
, rtx insns
)
2763 timevar_push (TV_TRACER
);
2764 open_dump_file (DFI_tracer
, decl
);
2766 dump_flow_info (rtl_dump_file
);
2768 cleanup_cfg (CLEANUP_EXPENSIVE
);
2769 reg_scan (insns
, max_reg_num (), 0);
2770 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
2771 timevar_pop (TV_TRACER
);
2774 /* If-conversion and CFG cleanup. */
2776 rest_of_handle_if_conversion (tree decl
, rtx insns
)
2778 open_dump_file (DFI_ce1
, decl
);
2779 if (flag_if_conversion
)
2781 timevar_push (TV_IFCVT
);
2783 dump_flow_info (rtl_dump_file
);
2784 cleanup_cfg (CLEANUP_EXPENSIVE
);
2785 reg_scan (insns
, max_reg_num (), 0);
2787 timevar_pop (TV_IFCVT
);
2789 timevar_push (TV_JUMP
);
2790 cleanup_cfg (CLEANUP_EXPENSIVE
);
2791 reg_scan (insns
, max_reg_num (), 0);
2792 timevar_pop (TV_JUMP
);
2793 close_dump_file (DFI_ce1
, print_rtl_with_bb
, get_insns ());
2796 /* Rerun if-conversion, as combine may have simplified things enough
2797 to now meet sequence length restrictions. */
2799 rest_of_handle_if_after_combine (tree decl
, rtx insns
)
2801 timevar_push (TV_IFCVT
);
2802 open_dump_file (DFI_ce2
, decl
);
2808 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
2809 timevar_pop (TV_IFCVT
);
2812 /* Do branch profiling and static profile estimation passes. */
2814 rest_of_handle_branch_prob (tree decl
, rtx insns
)
2818 timevar_push (TV_BRANCH_PROB
);
2819 open_dump_file (DFI_bp
, decl
);
2820 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2823 /* Discover and record the loop depth at the head of each basic
2824 block. The loop infrastructure does the real job for us. */
2825 flow_loops_find (&loops
, LOOP_TREE
);
2828 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2830 /* Estimate using heuristics if no profiling info is available. */
2831 if (flag_guess_branch_prob
)
2832 estimate_probability (&loops
);
2834 flow_loops_free (&loops
);
2835 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2836 timevar_pop (TV_BRANCH_PROB
);
2839 /* Do control and data flow analysis; write some of the results to the
2842 rest_of_handle_cfg (tree decl
, rtx insns
)
2844 open_dump_file (DFI_cfg
, decl
);
2846 dump_flow_info (rtl_dump_file
);
2848 cleanup_cfg (CLEANUP_EXPENSIVE
2849 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2851 /* It may make more sense to mark constant functions after dead code is
2852 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2853 may insert code making function non-constant, but we still must consider
2854 it as constant, otherwise -fbranch-probabilities will not read data back.
2856 life_analysis rarely eliminates modification of external memory.
2859 mark_constant_function ();
2861 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2864 /* Purge addressofs. */
2866 rest_of_handle_addresof (tree decl
, rtx insns
)
2868 open_dump_file (DFI_addressof
, decl
);
2870 purge_addressof (insns
);
2872 purge_all_dead_edges (0);
2873 reg_scan (insns
, max_reg_num (), 1);
2875 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2878 /* We may have potential sibling or tail recursion sites. Select one
2879 (of possibly multiple) methods of performing the call. */
2881 rest_of_handle_sibling_calls (rtx insns
)
2884 optimize_sibling_and_tail_recursive_calls ();
2886 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2887 free_bb_for_insn ();
2888 find_exception_handler_labels ();
2889 rebuild_jump_labels (insns
);
2890 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2892 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2893 notes before simplifying cfg and we must do lowering after sibcall
2894 that unhides parts of RTL chain and cleans up the CFG.
2896 Until sibcall is replaced by tree-level optimizer, lets just
2897 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2898 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2899 if (GET_CODE (insn
) == NOTE
2900 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2903 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2906 /* Perform jump bypassing and control flow optimizations. */
2908 rest_of_handle_jump_bypass (tree decl
, rtx insns
)
2910 timevar_push (TV_BYPASS
);
2911 open_dump_file (DFI_bypass
, decl
);
2913 cleanup_cfg (CLEANUP_EXPENSIVE
);
2915 if (bypass_jumps (rtl_dump_file
))
2917 rebuild_jump_labels (insns
);
2918 cleanup_cfg (CLEANUP_EXPENSIVE
);
2919 delete_trivially_dead_insns (insns
, max_reg_num ());
2922 close_dump_file (DFI_bypass
, print_rtl_with_bb
, insns
);
2923 timevar_pop (TV_BYPASS
);
2927 #ifdef ENABLE_CHECKING
2928 verify_flow_info ();
2932 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2933 if we must exit rest_of_compilation upon return. */
2935 rest_of_handle_inlining (tree decl
)
2942 /* If we are reconsidering an inline function at the end of
2943 compilation, skip the stuff for making it inline. */
2944 if (DECL_SAVED_INSNS (decl
) != 0)
2947 /* If this is nested inside an inlined external function, pretend
2948 it was only declared. Since we cannot inline such functions,
2949 generating code for this one is not only not necessary but will
2950 confuse some debugging output writers. */
2951 for (parent
= DECL_CONTEXT (current_function_decl
);
2952 parent
!= NULL_TREE
;
2953 parent
= get_containing_scope (parent
))
2954 if (TREE_CODE (parent
) == FUNCTION_DECL
2955 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2957 DECL_INITIAL (decl
) = 0;
2960 else if (TYPE_P (parent
))
2961 /* A function in a local class should be treated normally. */
2964 /* If requested, consider whether to make this function inline. */
2965 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2966 || flag_inline_functions
)
2968 timevar_push (TV_INTEGRATION
);
2969 lose
= function_cannot_inline_p (decl
);
2970 timevar_pop (TV_INTEGRATION
);
2971 if (lose
|| ! optimize
)
2973 if (warn_inline
&& DECL_INLINE (decl
))
2974 warning_with_decl (decl
, lose
);
2975 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2976 /* Don't really compile an extern inline function.
2977 If we can't make it inline, pretend
2978 it was only declared. */
2979 if (DECL_EXTERNAL (decl
))
2981 DECL_INITIAL (decl
) = 0;
2986 /* ??? Note that we used to just make it look like if
2987 the "inline" keyword was specified when we decide
2988 to inline it (because of -finline-functions).
2989 garloff@suse.de, 2002-04-24: Add another flag to
2990 actually record this piece of information. */
2991 if (!DECL_INLINE (decl
))
2992 DID_INLINE_FUNC (decl
) = 1;
2993 inlinable
= DECL_INLINE (decl
) = 1;
2997 insns
= get_insns ();
2999 /* Dump the rtl code if we are dumping rtl. */
3001 if (open_dump_file (DFI_rtl
, decl
))
3003 if (DECL_SAVED_INSNS (decl
))
3004 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
3005 close_dump_file (DFI_rtl
, print_rtl
, insns
);
3008 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
3009 sorts of eh initialization. Delay this until after the
3010 initial rtl dump so that we can see the original nesting. */
3011 convert_from_eh_region_ranges ();
3013 /* If function is inline, and we don't yet know whether to
3014 compile it by itself, defer decision till end of compilation.
3015 wrapup_global_declarations will (indirectly) call
3016 rest_of_compilation again for those functions that need to
3017 be output. Also defer those functions that we are supposed
3021 || (DECL_INLINE (decl
)
3022 && flag_inline_functions
3023 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
3024 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
3025 && ! flag_keep_inline_functions
)
3026 || DECL_EXTERNAL (decl
))))
3027 DECL_DEFER_OUTPUT (decl
) = 1;
3029 if (DECL_INLINE (decl
))
3030 /* DWARF wants separate debugging info for abstract and
3031 concrete instances of all inline functions, including those
3032 declared inline but not inlined, and those inlined even
3033 though they weren't declared inline. Conveniently, that's
3034 what DECL_INLINE means at this point. */
3035 (*debug_hooks
->deferred_inline_function
) (decl
);
3037 if (DECL_DEFER_OUTPUT (decl
))
3039 /* If -Wreturn-type, we have to do a bit of compilation. We just
3040 want to call cleanup the cfg to figure out whether or not we can
3041 fall off the end of the function; we do the minimum amount of
3042 work necessary to make that safe. */
3043 if (warn_return_type
)
3045 int saved_optimize
= optimize
;
3048 rebuild_jump_labels (insns
);
3049 find_exception_handler_labels ();
3050 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3051 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
3052 optimize
= saved_optimize
;
3054 /* CFG is no longer maintained up-to-date. */
3055 free_bb_for_insn ();
3058 set_nothrow_function_flags ();
3059 if (current_function_nothrow
)
3060 /* Now we know that this can't throw; set the flag for the benefit
3061 of other functions later in this translation unit. */
3062 TREE_NOTHROW (current_function_decl
) = 1;
3064 timevar_push (TV_INTEGRATION
);
3065 save_for_inline (decl
);
3066 timevar_pop (TV_INTEGRATION
);
3067 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
3071 /* If specified extern inline but we aren't inlining it, we are
3072 done. This goes for anything that gets here with DECL_EXTERNAL
3073 set, not just things with DECL_INLINE. */
3074 return (bool) DECL_EXTERNAL (decl
);
3077 /* Rest of compilation helper to convert the rtl to SSA form. */
3079 rest_of_handle_ssa (tree decl
, rtx insns
)
3081 timevar_push (TV_TO_SSA
);
3082 open_dump_file (DFI_ssa
, decl
);
3084 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3087 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3088 timevar_pop (TV_TO_SSA
);
3090 /* Perform sparse conditional constant propagation, if requested. */
3093 timevar_push (TV_SSA_CCP
);
3094 open_dump_file (DFI_ssa_ccp
, decl
);
3098 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
3099 timevar_pop (TV_SSA_CCP
);
3102 /* It would be useful to cleanup the CFG at this point, but block
3103 merging and possibly other transformations might leave a PHI
3104 node in the middle of a basic block, which is a strict no-no. */
3106 /* The SSA implementation uses basic block numbers in its phi
3107 nodes. Thus, changing the control-flow graph or the basic
3108 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3109 may cause problems. */
3113 /* Remove dead code. */
3115 timevar_push (TV_SSA_DCE
);
3116 open_dump_file (DFI_ssa_dce
, decl
);
3118 insns
= get_insns ();
3119 ssa_eliminate_dead_code ();
3121 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
3122 timevar_pop (TV_SSA_DCE
);
3125 /* Convert from SSA form. */
3127 timevar_push (TV_FROM_SSA
);
3128 open_dump_file (DFI_ussa
, decl
);
3130 convert_from_ssa ();
3131 /* New registers have been created. Rescan their usage. */
3132 reg_scan (insns
, max_reg_num (), 1);
3134 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3135 timevar_pop (TV_FROM_SSA
);
3142 /* Try to identify useless null pointer tests and delete them. */
3144 rest_of_handle_null_pointer (tree decl
, rtx insns
)
3146 open_dump_file (DFI_null
, decl
);
3148 dump_flow_info (rtl_dump_file
);
3150 if (delete_null_pointer_checks (insns
))
3151 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3153 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
3156 /* Try combining insns through substitution. */
3158 rest_of_handle_combine (tree decl
, rtx insns
)
3160 int rebuild_jump_labels_after_combine
= 0;
3162 timevar_push (TV_COMBINE
);
3163 open_dump_file (DFI_combine
, decl
);
3165 rebuild_jump_labels_after_combine
3166 = combine_instructions (insns
, max_reg_num ());
3168 /* Combining insns may have turned an indirect jump into a
3169 direct jump. Rebuild the JUMP_LABEL fields of jumping
3171 if (rebuild_jump_labels_after_combine
)
3173 timevar_push (TV_JUMP
);
3174 rebuild_jump_labels (insns
);
3175 timevar_pop (TV_JUMP
);
3177 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3180 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3181 timevar_pop (TV_COMBINE
);
3186 /* Perform life analysis. */
3188 rest_of_handle_life (tree decl
, rtx insns
)
3190 open_dump_file (DFI_life
, decl
);
3193 #ifdef ENABLE_CHECKING
3194 verify_flow_info ();
3196 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3198 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
3199 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3200 timevar_pop (TV_FLOW
);
3202 if (warn_uninitialized
)
3204 uninitialized_vars_warning (DECL_INITIAL (decl
));
3206 setjmp_args_warning ();
3211 if (!flag_new_regalloc
&& initialize_uninitialized_subregs ())
3213 /* Insns were inserted, and possibly pseudos created, so
3214 things might look a bit different. */
3215 insns
= get_insns ();
3216 allocate_reg_life_data ();
3217 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3218 PROP_LOG_LINKS
| PROP_REG_INFO
| PROP_DEATH_NOTES
);
3224 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3229 /* Perform common subexpression elimination. Nonzero value from
3230 `cse_main' means that jumps were simplified and some code may now
3231 be unreachable, so do jump optimization again. */
3233 rest_of_handle_cse (tree decl
, rtx insns
)
3237 open_dump_file (DFI_cse
, decl
);
3239 dump_flow_info (rtl_dump_file
);
3240 timevar_push (TV_CSE
);
3242 reg_scan (insns
, max_reg_num (), 1);
3244 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3246 rebuild_jump_labels (insns
);
3247 purge_all_dead_edges (0);
3249 delete_trivially_dead_insns (insns
, max_reg_num ());
3251 /* If we are not running more CSE passes, then we are no longer
3252 expecting CSE to be run. But always rerun it in a cheap mode. */
3253 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3255 if (tem
|| optimize
> 1)
3256 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3257 /* Try to identify useless null pointer tests and delete them. */
3258 if (flag_delete_null_pointer_checks
)
3260 timevar_push (TV_JUMP
);
3262 if (delete_null_pointer_checks (insns
))
3263 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3264 timevar_pop (TV_JUMP
);
3267 /* The second pass of jump optimization is likely to have
3268 removed a bunch more instructions. */
3269 renumber_insns (rtl_dump_file
);
3271 timevar_pop (TV_CSE
);
3272 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
3275 /* Run second CSE pass after loop optimizations. */
3277 rest_of_handle_cse2 (tree decl
, rtx insns
)
3281 timevar_push (TV_CSE2
);
3282 open_dump_file (DFI_cse2
, decl
);
3284 dump_flow_info (rtl_dump_file
);
3285 /* CFG is no longer maintained up-to-date. */
3286 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3287 purge_all_dead_edges (0);
3288 delete_trivially_dead_insns (insns
, max_reg_num ());
3292 timevar_push (TV_JUMP
);
3293 rebuild_jump_labels (insns
);
3294 cleanup_cfg (CLEANUP_EXPENSIVE
);
3295 timevar_pop (TV_JUMP
);
3297 reg_scan (insns
, max_reg_num (), 0);
3298 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
3300 timevar_pop (TV_CSE2
);
3303 /* Perform global cse. */
3305 rest_of_handle_gcse (tree decl
, rtx insns
)
3307 int save_csb
, save_cfj
;
3310 timevar_push (TV_GCSE
);
3311 open_dump_file (DFI_gcse
, decl
);
3313 tem
= gcse_main (insns
, rtl_dump_file
);
3314 rebuild_jump_labels (insns
);
3315 delete_trivially_dead_insns (insns
, max_reg_num ());
3317 save_csb
= flag_cse_skip_blocks
;
3318 save_cfj
= flag_cse_follow_jumps
;
3319 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3321 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
3322 if (current_function_calls_constant_p
)
3323 purge_builtin_constant_p ();
3325 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3327 if (flag_expensive_optimizations
)
3329 timevar_push (TV_CSE
);
3330 reg_scan (insns
, max_reg_num (), 1);
3331 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3332 purge_all_dead_edges (0);
3333 delete_trivially_dead_insns (insns
, max_reg_num ());
3334 timevar_pop (TV_CSE
);
3335 cse_not_expected
= !flag_rerun_cse_after_loop
;
3338 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3339 things up. Then possibly re-run CSE again. */
3343 timevar_push (TV_JUMP
);
3344 rebuild_jump_labels (insns
);
3345 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3346 timevar_pop (TV_JUMP
);
3348 if (flag_expensive_optimizations
)
3350 timevar_push (TV_CSE
);
3351 reg_scan (insns
, max_reg_num (), 1);
3352 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3353 purge_all_dead_edges (0);
3354 delete_trivially_dead_insns (insns
, max_reg_num ());
3355 timevar_pop (TV_CSE
);
3359 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
3360 timevar_pop (TV_GCSE
);
3363 flag_cse_skip_blocks
= save_csb
;
3364 flag_cse_follow_jumps
= save_cfj
;
3365 #ifdef ENABLE_CHECKING
3366 verify_flow_info ();
3370 /* Move constant computations out of loops. */
3372 rest_of_handle_loop_optimize (tree decl
, rtx insns
)
3374 int do_unroll
, do_prefetch
;
3376 timevar_push (TV_LOOP
);
3377 delete_dead_jumptables ();
3378 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3379 open_dump_file (DFI_loop
, decl
);
3381 /* CFG is no longer maintained up-to-date. */
3382 free_bb_for_insn ();
3384 if (flag_unroll_loops
)
3385 do_unroll
= 0; /* Having two unrollers is useless. */
3387 do_unroll
= flag_old_unroll_loops
? LOOP_UNROLL
: LOOP_AUTO_UNROLL
;
3388 do_prefetch
= flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0;
3390 if (flag_rerun_loop_opt
)
3392 cleanup_barriers ();
3394 /* We only want to perform unrolling once. */
3395 loop_optimize (insns
, rtl_dump_file
, do_unroll
);
3398 /* The first call to loop_optimize makes some instructions
3399 trivially dead. We delete those instructions now in the
3400 hope that doing so will make the heuristics in loop work
3401 better and possibly speed up compilation. */
3402 delete_trivially_dead_insns (insns
, max_reg_num ());
3404 /* The regscan pass is currently necessary as the alias
3405 analysis code depends on this information. */
3406 reg_scan (insns
, max_reg_num (), 1);
3408 cleanup_barriers ();
3409 loop_optimize (insns
, rtl_dump_file
, do_unroll
| LOOP_BCT
| do_prefetch
);
3411 /* Loop can create trivially dead instructions. */
3412 delete_trivially_dead_insns (insns
, max_reg_num ());
3413 close_dump_file (DFI_loop
, print_rtl
, insns
);
3414 timevar_pop (TV_LOOP
);
3415 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3420 /* Perform loop optimalizations. It might be better to do them a bit
3421 sooner, but we want the profile feedback to work more
3424 rest_of_handle_loop2 (tree decl
, rtx insns
)
3426 struct loops
*loops
;
3427 timevar_push (TV_LOOP
);
3428 open_dump_file (DFI_loop2
, decl
);
3430 dump_flow_info (rtl_dump_file
);
3432 loops
= loop_optimizer_init (rtl_dump_file
);
3436 /* The optimalizations: */
3437 if (flag_unswitch_loops
)
3438 unswitch_loops (loops
);
3440 if (flag_peel_loops
|| flag_unroll_loops
)
3441 unroll_and_peel_loops (loops
,
3442 (flag_peel_loops
? UAP_PEEL
: 0) |
3443 (flag_unroll_loops
? UAP_UNROLL
: 0) |
3444 (flag_unroll_all_loops
? UAP_UNROLL_ALL
: 0));
3446 loop_optimizer_finalize (loops
, rtl_dump_file
);
3449 cleanup_cfg (CLEANUP_EXPENSIVE
);
3450 delete_trivially_dead_insns (insns
, max_reg_num ());
3451 reg_scan (insns
, max_reg_num (), 0);
3453 dump_flow_info (rtl_dump_file
);
3454 close_dump_file (DFI_loop2
, print_rtl_with_bb
, get_insns ());
3455 timevar_pop (TV_LOOP
);
3459 /* This is called from finish_function (within langhooks.parse_file)
3460 after each top-level definition is parsed.
3461 It is supposed to compile that function or variable
3462 and output the assembler code for it.
3463 After we return, the tree storage is freed. */
3466 rest_of_compilation (tree decl
)
3469 int rebuild_label_notes_after_reload
;
3471 timevar_push (TV_REST_OF_COMPILATION
);
3473 /* Register rtl specific functions for cfg. */
3474 rtl_register_cfg_hooks ();
3476 /* Now that we're out of the frontend, we shouldn't have any more
3477 CONCATs anywhere. */
3478 generating_concat_p
= 0;
3480 /* When processing delayed functions, prepare_function_start() won't
3481 have been run to re-initialize it. */
3482 cse_not_expected
= ! optimize
;
3484 /* First, make sure that NOTE_BLOCK is set correctly for each
3485 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3486 if (!cfun
->x_whole_function_mode_p
)
3489 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3490 tree in sensible shape. So, we just recalculate it here. */
3491 if (cfun
->x_whole_function_mode_p
)
3496 if (rest_of_handle_inlining (decl
))
3497 goto exit_rest_of_compilation
;
3499 /* If we're emitting a nested function, make sure its parent gets
3500 emitted as well. Doing otherwise confuses debug info. */
3503 for (parent
= DECL_CONTEXT (current_function_decl
);
3504 parent
!= NULL_TREE
;
3505 parent
= get_containing_scope (parent
))
3506 if (TREE_CODE (parent
) == FUNCTION_DECL
)
3507 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
3510 /* We are now committed to emitting code for this function. Do any
3511 preparation, such as emitting abstract debug info for the inline
3512 before it gets mangled by optimization. */
3513 if (DECL_INLINE (decl
))
3514 (*debug_hooks
->outlining_inline_function
) (decl
);
3516 /* Remove any notes we don't need. That will make iterating
3517 over the instruction sequence faster, and allow the garbage
3518 collector to reclaim the memory used by the notes. */
3519 remove_unnecessary_notes ();
3524 /* Initialize some variables used by the optimizers. */
3525 init_function_for_compilation ();
3527 if (! DECL_DEFER_OUTPUT (decl
))
3528 TREE_ASM_WRITTEN (decl
) = 1;
3530 /* Now that integrate will no longer see our rtl, we need not
3531 distinguish between the return value of this function and the
3532 return value of called functions. Also, we can remove all SETs
3533 of subregs of hard registers; they are only here because of
3534 integrate. Also, we can now initialize pseudos intended to
3535 carry magic hard reg data throughout the function. */
3536 rtx_equal_function_value_matters
= 0;
3537 purge_hard_subreg_sets (get_insns ());
3539 /* Early return if there were errors. We can run afoul of our
3540 consistency checks, and there's not really much point in fixing them.
3541 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3542 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
3543 || errorcount
|| sorrycount
)
3544 goto exit_rest_of_compilation
;
3546 timevar_push (TV_JUMP
);
3547 open_dump_file (DFI_sibling
, decl
);
3548 insns
= get_insns ();
3549 rebuild_jump_labels (insns
);
3550 find_exception_handler_labels ();
3551 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3553 delete_unreachable_blocks ();
3555 /* We have to issue these warnings now already, because CFG cleanups
3556 further down may destroy the required information. */
3557 check_function_return_warnings ();
3559 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3560 if (flag_guess_branch_prob
)
3562 timevar_push (TV_BRANCH_PROB
);
3563 note_prediction_to_br_prob ();
3564 timevar_pop (TV_BRANCH_PROB
);
3567 if (flag_optimize_sibling_calls
)
3568 rest_of_handle_sibling_calls (insns
);
3570 timevar_pop (TV_JUMP
);
3572 insn_locators_initialize ();
3573 /* Complete generation of exception handling code. */
3576 timevar_push (TV_JUMP
);
3577 open_dump_file (DFI_eh
, decl
);
3579 finish_eh_generation ();
3581 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
3582 timevar_pop (TV_JUMP
);
3585 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3586 generation, which might create new sets. */
3587 emit_initial_value_sets ();
3590 /* If we are doing position-independent code generation, now
3591 is the time to output special prologues and epilogues.
3592 We do not want to do this earlier, because it just clutters
3593 up inline functions with meaningless insns. */
3598 insns
= get_insns ();
3600 /* Copy any shared structure that should not be shared. */
3601 unshare_all_rtl (current_function_decl
, insns
);
3603 #ifdef SETJMP_VIA_SAVE_AREA
3604 /* This must be performed before virtual register instantiation.
3605 Please be aware the everything in the compiler that can look
3606 at the RTL up to this point must understand that REG_SAVE_AREA
3607 is just like a use of the REG contained inside. */
3608 if (current_function_calls_alloca
)
3609 optimize_save_area_alloca (insns
);
3612 /* Instantiate all virtual registers. */
3613 instantiate_virtual_regs (current_function_decl
, insns
);
3615 open_dump_file (DFI_jump
, decl
);
3617 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3618 are initialized and to compute whether control can drop off the end
3621 timevar_push (TV_JUMP
);
3622 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3623 before jump optimization switches branch directions. */
3624 if (flag_guess_branch_prob
)
3625 expected_value_to_br_prob ();
3627 reg_scan (insns
, max_reg_num (), 0);
3628 rebuild_jump_labels (insns
);
3629 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3630 delete_trivially_dead_insns (insns
, max_reg_num ());
3632 dump_flow_info (rtl_dump_file
);
3633 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
3634 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3638 free_bb_for_insn ();
3639 copy_loop_headers (insns
);
3640 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3642 purge_line_number_notes (insns
);
3644 timevar_pop (TV_JUMP
);
3645 close_dump_file (DFI_jump
, print_rtl
, insns
);
3647 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3648 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
3649 goto exit_rest_of_compilation
;
3651 /* Long term, this should probably move before the jump optimizer too,
3652 but I didn't want to disturb the rtl_dump_and_exit and related
3653 stuff at this time. */
3654 if (optimize
> 0 && flag_ssa
)
3655 insns
= rest_of_handle_ssa (decl
, insns
);
3657 timevar_push (TV_JUMP
);
3660 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3662 if (flag_delete_null_pointer_checks
)
3663 rest_of_handle_null_pointer (decl
, insns
);
3665 /* Jump optimization, and the removal of NULL pointer checks, may
3666 have reduced the number of instructions substantially. CSE, and
3667 future passes, allocate arrays whose dimensions involve the
3668 maximum instruction UID, so if we can reduce the maximum UID
3669 we'll save big on memory. */
3670 renumber_insns (rtl_dump_file
);
3671 timevar_pop (TV_JUMP
);
3673 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
3678 rest_of_handle_cse (decl
, insns
);
3680 rest_of_handle_addresof (decl
, insns
);
3687 rest_of_handle_gcse (decl
, insns
);
3689 if (flag_loop_optimize
)
3690 rest_of_handle_loop_optimize (decl
, insns
);
3693 rest_of_handle_jump_bypass (decl
, insns
);
3696 timevar_push (TV_FLOW
);
3698 rest_of_handle_cfg (decl
, insns
);
3701 || profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3702 rest_of_handle_branch_prob (decl
, insns
);
3705 rest_of_handle_if_conversion (decl
, insns
);
3708 rest_of_handle_tracer (decl
, insns
);
3711 && (flag_unswitch_loops
3713 || flag_unroll_loops
))
3714 rest_of_handle_loop2 (decl
, insns
);
3716 if (flag_rerun_cse_after_loop
)
3717 rest_of_handle_cse2 (decl
, insns
);
3719 cse_not_expected
= 1;
3721 rest_of_handle_life (decl
, insns
);
3724 rest_of_handle_combine (decl
, insns
);
3726 if (flag_if_conversion
)
3727 rest_of_handle_if_after_combine (decl
, insns
);
3729 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3730 rest_of_handle_regmove (decl
, insns
);
3732 /* Do unconditional splitting before register allocation to allow machine
3733 description to add extra information not needed previously. */
3734 split_all_insns (1);
3736 #ifdef OPTIMIZE_MODE_SWITCHING
3737 timevar_push (TV_MODE_SWITCH
);
3740 optimize_mode_switching (NULL
);
3743 timevar_pop (TV_MODE_SWITCH
);
3746 /* Any of the several passes since flow1 will have munged register
3747 lifetime data a bit. We need it to be up to date for scheduling
3748 (see handling of reg_known_equiv in init_alias_analysis). */
3749 recompute_reg_usage (insns
, !optimize_size
);
3751 rest_of_handle_sched (decl
, insns
);
3753 /* Determine if the current function is a leaf before running reload
3754 since this can impact optimizations done by the prologue and
3755 epilogue thus changing register elimination offsets. */
3756 current_function_is_leaf
= leaf_function_p ();
3758 timevar_push (TV_LOCAL_ALLOC
);
3759 open_dump_file (DFI_lreg
, decl
);
3761 if (flag_new_regalloc
)
3763 if (rest_of_handle_new_regalloc (decl
, insns
,
3764 &rebuild_label_notes_after_reload
))
3765 goto exit_rest_of_compilation
;
3769 if (rest_of_handle_old_regalloc (decl
, insns
,
3770 &rebuild_label_notes_after_reload
))
3771 goto exit_rest_of_compilation
;
3776 open_dump_file (DFI_postreload
, decl
);
3778 /* Do a very simple CSE pass over just the hard registers. */
3781 timevar_push (TV_RELOAD_CSE_REGS
);
3782 reload_cse_regs (insns
);
3783 timevar_pop (TV_RELOAD_CSE_REGS
);
3786 /* Register allocation and reloading may have turned an indirect jump into
3787 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3788 jumping instructions. */
3789 if (rebuild_label_notes_after_reload
)
3791 timevar_push (TV_JUMP
);
3793 rebuild_jump_labels (insns
);
3794 purge_all_dead_edges (0);
3796 timevar_pop (TV_JUMP
);
3799 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3801 /* Re-create the death notes which were deleted during reload. */
3802 timevar_push (TV_FLOW2
);
3803 open_dump_file (DFI_flow2
, decl
);
3805 #ifdef ENABLE_CHECKING
3806 verify_flow_info ();
3809 /* If optimizing, then go ahead and split insns now. */
3813 split_all_insns (0);
3816 cleanup_cfg (CLEANUP_EXPENSIVE
);
3818 /* On some machines, the prologue and epilogue code, or parts thereof,
3819 can be represented as RTL. Doing so lets us schedule insns between
3820 it and the rest of the code and also allows delayed branch
3821 scheduling to operate in the epilogue. */
3822 thread_prologue_and_epilogue_insns (insns
);
3826 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3827 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3828 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3830 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3831 even for machines with possibly nonzero RETURN_POPS_ARGS
3832 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3833 push instructions will have popping returns. */
3834 #ifndef PUSH_ROUNDING
3835 if (!ACCUMULATE_OUTGOING_ARGS
)
3837 combine_stack_adjustments ();
3842 flow2_completed
= 1;
3844 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3845 timevar_pop (TV_FLOW2
);
3847 #ifdef HAVE_peephole2
3848 if (optimize
> 0 && flag_peephole2
)
3850 timevar_push (TV_PEEPHOLE2
);
3851 open_dump_file (DFI_peephole2
, decl
);
3853 peephole2_optimize (rtl_dump_file
);
3855 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3856 timevar_pop (TV_PEEPHOLE2
);
3862 if (flag_rename_registers
|| flag_cprop_registers
)
3863 rest_of_handle_regrename (decl
, insns
);
3865 rest_of_handle_reorder_blocks (decl
, insns
);
3868 if (flag_if_conversion2
)
3870 timevar_push (TV_IFCVT2
);
3871 open_dump_file (DFI_ce3
, decl
);
3875 close_dump_file (DFI_ce3
, print_rtl_with_bb
, insns
);
3876 timevar_pop (TV_IFCVT2
);
3879 #ifdef INSN_SCHEDULING
3880 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3881 rest_of_handle_sched2 (decl
, insns
);
3884 #ifdef LEAF_REGISTERS
3885 current_function_uses_only_leaf_regs
3886 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3890 rest_of_handle_stack_regs (decl
, insns
);
3893 compute_alignments ();
3895 /* CFG is no longer maintained up-to-date. */
3896 free_bb_for_insn ();
3898 if (targetm
.machine_dependent_reorg
!= 0)
3899 rest_of_handle_machine_reorg (decl
, insns
);
3901 purge_line_number_notes (insns
);
3902 cleanup_barriers ();
3905 if (optimize
> 0 && flag_delayed_branch
)
3906 rest_of_handle_delay_slots (decl
, insns
);
3909 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3910 timevar_push (TV_SHORTEN_BRANCH
);
3911 split_all_insns_noflow ();
3912 timevar_pop (TV_SHORTEN_BRANCH
);
3915 convert_to_eh_region_ranges ();
3917 /* Shorten branches. */
3918 timevar_push (TV_SHORTEN_BRANCH
);
3919 shorten_branches (get_insns ());
3920 timevar_pop (TV_SHORTEN_BRANCH
);
3922 set_nothrow_function_flags ();
3923 if (current_function_nothrow
)
3924 /* Now we know that this can't throw; set the flag for the benefit
3925 of other functions later in this translation unit. */
3926 TREE_NOTHROW (current_function_decl
) = 1;
3928 rest_of_handle_final (decl
, insns
);
3930 /* Write DBX symbols if requested. */
3932 /* Note that for those inline functions where we don't initially
3933 know for certain that we will be generating an out-of-line copy,
3934 the first invocation of this routine (rest_of_compilation) will
3935 skip over this code by doing a `goto exit_rest_of_compilation;'.
3936 Later on, wrapup_global_declarations will (indirectly) call
3937 rest_of_compilation again for those inline functions that need
3938 to have out-of-line copies generated. During that call, we
3939 *will* be routed past here. */
3941 timevar_push (TV_SYMOUT
);
3942 (*debug_hooks
->function_decl
) (decl
);
3943 timevar_pop (TV_SYMOUT
);
3945 exit_rest_of_compilation
:
3947 coverage_end_function ();
3949 /* In case the function was not output,
3950 don't leave any temporary anonymous types
3951 queued up for sdb output. */
3952 #ifdef SDB_DEBUGGING_INFO
3953 if (write_symbols
== SDB_DEBUG
)
3954 sdbout_types (NULL_TREE
);
3957 reload_completed
= 0;
3958 flow2_completed
= 0;
3961 timevar_push (TV_FINAL
);
3963 /* Clear out the insn_length contents now that they are no
3965 init_insn_lengths ();
3967 /* Show no temporary slots allocated. */
3970 free_basic_block_vars (0);
3971 free_bb_for_insn ();
3973 timevar_pop (TV_FINAL
);
3975 if ((*targetm
.binds_local_p
) (current_function_decl
))
3977 int pref
= cfun
->preferred_stack_boundary
;
3978 if (cfun
->recursive_call_emit
3979 && cfun
->stack_alignment_needed
> cfun
->preferred_stack_boundary
)
3980 pref
= cfun
->stack_alignment_needed
;
3981 cgraph_rtl_info (current_function_decl
)->preferred_incoming_stack_boundary
3985 /* Make sure volatile mem refs aren't considered valid operands for
3986 arithmetic insns. We must call this here if this is a nested inline
3987 function, since the above code leaves us in the init_recog state
3988 (from final.c), and the function context push/pop code does not
3989 save/restore volatile_ok.
3991 ??? Maybe it isn't necessary for expand_start_function to call this
3992 anymore if we do it here? */
3994 init_recog_no_volatile ();
3996 /* We're done with this function. Free up memory if we can. */
3997 free_after_parsing (cfun
);
3998 if (! DECL_DEFER_OUTPUT (decl
))
4000 free_after_compilation (cfun
);
4002 /* Clear integrate.c's pointer to the cfun structure we just
4004 DECL_SAVED_INSNS (decl
) = 0;
4010 timevar_pop (TV_REST_OF_COMPILATION
);
4013 /* Display help for generic options. */
4021 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
4022 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
4023 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
4024 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
4025 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
4026 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"));
4027 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
4028 printf (_(" -fstack-limit-register=<register> Trap if the stack goes past <register>\n"));
4029 printf (_(" -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>\n"));
4030 printf (_(" -frandom-seed=<string> Make compile reproducible using <string>\n"));
4033 for (i
= ARRAY_SIZE (f_options
); i
--;)
4035 const char *description
= f_options
[i
].description
;
4037 if (description
!= NULL
&& *description
!= 0)
4038 printf (" -f%-21s %s\n",
4039 f_options
[i
].string
, _(description
));
4042 printf (_(" -O[number] Set optimization level to [number]\n"));
4043 printf (_(" -Os Optimize for space rather than speed\n"));
4044 for (i
= LAST_PARAM
; i
--;)
4046 const char *description
= compiler_params
[i
].help
;
4047 const int length
= 21 - strlen (compiler_params
[i
].option
);
4049 if (description
!= NULL
&& *description
!= 0)
4050 printf (" --param %s=<value>%.*s%s\n",
4051 compiler_params
[i
].option
,
4052 length
> 0 ? length
: 1, " ",
4055 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
4056 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
4057 printf (_(" -w Suppress warnings\n"));
4059 for (i
= ARRAY_SIZE (W_options
); i
--;)
4061 const char *description
= W_options
[i
].description
;
4063 if (description
!= NULL
&& *description
!= 0)
4064 printf (" -W%-21s %s\n",
4065 W_options
[i
].string
, _(description
));
4068 printf (_(" -Wextra Print extra (possibly unwanted) warnings\n"));
4069 printf (_(" -Wunused Enable unused warnings\n"));
4070 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
4071 printf (_(" -p Enable function profiling\n"));
4072 printf (_(" -o <file> Place output into <file> \n"));
4074 -G <number> Put global and static data smaller than <number>\n\
4075 bytes into a special section (on some targets)\n"));
4077 for (i
= ARRAY_SIZE (debug_args
); i
--;)
4079 if (debug_args
[i
].description
!= NULL
)
4080 printf (" -g%-21s %s\n",
4081 debug_args
[i
].arg
, _(debug_args
[i
].description
));
4084 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
4085 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
4086 printf (_(" -version Display the compiler's version\n"));
4087 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
4088 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
4089 #if defined INSN_SCHEDULING
4090 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
4092 printf (_(" --help Display this information\n"));
4097 /* Display descriptions of language specific options.
4098 If there is no description, note that there is an undocumented option.
4099 If the description is empty, do not display anything. (This allows
4100 options to be deliberately undocumented, for whatever reason).
4101 If the option string is missing, then this is a marker, indicating
4102 that the description string is in fact the name of a language, whose
4103 language specific options are to follow. */
4105 if (ARRAY_SIZE (documented_lang_options
) > 1)
4107 printf (_("\nLanguage specific options:\n"));
4109 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
4111 const char *description
= documented_lang_options
[i
].description
;
4112 const char *option
= documented_lang_options
[i
].option
;
4114 if (description
== NULL
)
4119 printf (_(" %-23.23s [undocumented]\n"), option
);
4121 else if (*description
== 0)
4123 else if (option
== NULL
)
4127 (_("\nThere are undocumented %s specific options as well.\n"),
4131 printf (_("\n Options for %s:\n"), description
);
4136 printf (" %-23.23s %s\n", option
, _(description
));
4141 printf (_("\nThere are undocumented %s specific options as well.\n"),
4144 display_target_options ();
4147 /* Display help for target options. */
4149 display_target_options (void)
4152 static bool displayed
= false;
4154 /* Avoid double printing for --help --target-help. */
4159 if (ARRAY_SIZE (target_switches
) > 1
4160 #ifdef TARGET_OPTIONS
4161 || ARRAY_SIZE (target_options
) > 1
4169 printf (_("\nTarget specific options:\n"));
4171 for (i
= ARRAY_SIZE (target_switches
); i
--;)
4173 const char *option
= target_switches
[i
].name
;
4174 const char *description
= target_switches
[i
].description
;
4176 if (option
== NULL
|| *option
== 0)
4178 else if (description
== NULL
)
4183 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4185 else if (*description
!= 0)
4186 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4189 #ifdef TARGET_OPTIONS
4190 for (i
= ARRAY_SIZE (target_options
); i
--;)
4192 const char *option
= target_options
[i
].prefix
;
4193 const char *description
= target_options
[i
].description
;
4195 if (option
== NULL
|| *option
== 0)
4197 else if (description
== NULL
)
4202 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4204 else if (*description
!= 0)
4205 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4211 printf (_("\nThere are undocumented target specific options as well.\n"));
4213 printf (_(" They exist, but they are not documented.\n"));
4218 /* Parse a -d... command line switch. */
4221 decode_d_option (const char *arg
)
4229 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4230 dump_file
[i
].enabled
= 1;
4236 flag_print_asm_name
= 1;
4239 flag_dump_rtl_in_asm
= 1;
4240 flag_print_asm_name
= 1;
4243 graph_dump_format
= vcg
;
4246 rtl_dump_and_exit
= 1;
4251 case 'D': /* These are handled by the preprocessor. */
4255 setup_core_dumping();
4260 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4261 if (c
== dump_file
[i
].debug_switch
)
4263 dump_file
[i
].enabled
= 1;
4268 warning ("unrecognized gcc debugging option: %c", c
);
4273 /* Parse a -f... command line switch. ARG is the value after the -f.
4274 It is safe to access 'ARG - 2' to generate the full switch name.
4275 Return the number of strings consumed. */
4278 decode_f_option (const char *arg
)
4281 const char *option_value
= NULL
;
4283 /* Search for the option in the table of binary f options. */
4284 for (j
= ARRAY_SIZE (f_options
); j
--;)
4286 if (!strcmp (arg
, f_options
[j
].string
))
4288 *f_options
[j
].variable
= f_options
[j
].on_value
;
4292 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4293 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4295 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4300 if (!strcmp (arg
, "fast-math"))
4301 set_fast_math_flags (1);
4302 else if (!strcmp (arg
, "no-fast-math"))
4303 set_fast_math_flags (0);
4304 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4305 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4308 read_integral_parameter (option_value
, arg
- 2,
4310 set_param_value ("max-inline-insns", val
);
4311 set_param_value ("max-inline-insns-single", val
/2);
4312 set_param_value ("max-inline-insns-auto", val
/2);
4313 set_param_value ("max-inline-insns-rtl", val
);
4314 if (val
/4 < MIN_INLINE_INSNS
)
4317 set_param_value ("min-inline-insns", val
/4);
4319 set_param_value ("min-inline-insns", 10);
4322 else if ((option_value
= skip_leading_substring (arg
, "tls-model=")))
4324 if (strcmp (option_value
, "global-dynamic") == 0)
4325 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
4326 else if (strcmp (option_value
, "local-dynamic") == 0)
4327 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
4328 else if (strcmp (option_value
, "initial-exec") == 0)
4329 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
4330 else if (strcmp (option_value
, "local-exec") == 0)
4331 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
4333 warning ("`%s': unknown tls-model option", arg
- 2);
4335 #ifdef INSN_SCHEDULING
4336 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4337 fix_sched_param ("verbose", option_value
);
4339 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4340 fix_register (option_value
, 1, 1);
4341 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4342 fix_register (option_value
, 0, 1);
4343 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4344 fix_register (option_value
, 0, 0);
4345 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4346 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4347 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4349 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4350 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4351 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4352 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4354 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4355 else if ((option_value
4356 = skip_leading_substring (arg
, "stack-limit-register=")))
4358 int reg
= decode_reg_name (option_value
);
4360 error ("unrecognized register name `%s'", option_value
);
4362 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4364 else if ((option_value
4365 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4368 nm
= ggc_strdup (option_value
);
4369 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4371 else if ((option_value
4372 = skip_leading_substring (arg
, "message-length=")))
4373 output_set_maximum_length
4374 (&global_dc
->buffer
, read_integral_parameter
4375 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4376 else if ((option_value
4377 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4379 if (!strcmp (option_value
, "once"))
4380 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4381 else if (!strcmp (option_value
, "every-line"))
4382 diagnostic_prefixing_rule (global_dc
)
4383 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4385 error ("unrecognized option `%s'", arg
- 2);
4387 else if (!strcmp (arg
, "no-stack-limit"))
4388 stack_limit_rtx
= NULL_RTX
;
4389 else if ((option_value
= skip_leading_substring (arg
, "random-seed=")))
4390 flag_random_seed
= option_value
;
4391 else if (!strcmp (arg
, "no-random-seed"))
4392 flag_random_seed
= NULL
;
4393 else if (!strcmp (arg
, "preprocessed"))
4394 /* Recognize this switch but do nothing. This prevents warnings
4395 about an unrecognized switch if cpplib has not been linked in. */
4403 /* Parse a -W... command line switch. ARG is the value after the -W.
4404 It is safe to access 'ARG - 2' to generate the full switch name.
4405 Return the number of strings consumed. */
4408 decode_W_option (const char *arg
)
4410 const char *option_value
= NULL
;
4413 /* Search for the option in the table of binary W options. */
4415 for (j
= ARRAY_SIZE (W_options
); j
--;)
4417 if (!strcmp (arg
, W_options
[j
].string
))
4419 *W_options
[j
].variable
= W_options
[j
].on_value
;
4423 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4424 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4426 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4431 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4432 warning ("-Wid-clash-LEN is no longer supported");
4433 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4435 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4437 warn_larger_than
= larger_than_size
!= -1;
4439 else if (!strcmp (arg
, "unused"))
4443 else if (!strcmp (arg
, "no-unused"))
4447 else if (!strcmp (arg
, "extra"))
4451 else if (!strcmp (arg
, "no-extra"))
4461 /* Indexed by enum debug_info_type. */
4462 const char *const debug_type_names
[] =
4464 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4467 /* Parse a -g... command line switch. ARG is the value after the -g.
4468 It is safe to access 'ARG - 2' to generate the full switch name.
4469 Return the number of strings consumed. */
4472 decode_g_option (const char *arg
)
4474 static unsigned level
= 0;
4475 /* A lot of code assumes write_symbols == NO_DEBUG if the
4476 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4477 of what debugging type has been selected). This records the
4478 selected type. It is an error to specify more than one
4480 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4481 /* Nonzero if debugging format has been explicitly set.
4482 -g and -ggdb don't explicitly set the debugging format so
4483 -gdwarf -g3 is equivalent to -gdwarf3. */
4484 static int type_explicitly_set_p
= 0;
4486 /* The maximum admissible debug level value. */
4487 static const unsigned max_debug_level
= 3;
4489 /* Look up ARG in the table. */
4490 for (da
= debug_args
; da
->arg
; da
++)
4492 const int da_len
= strlen (da
->arg
);
4494 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4496 enum debug_info_type type
= da
->debug_type
;
4497 const char *p
= arg
+ da_len
;
4499 if (*p
&& ! ISDIGIT (*p
))
4502 /* A debug flag without a level defaults to level 2.
4503 Note we do not want to call read_integral_parameter
4504 for that case since it will call atoi which
4507 ??? We may want to generalize the interface to
4508 read_integral_parameter to better handle this case
4509 if this case shows up often. */
4511 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4513 level
= (level
== 0) ? 2 : level
;
4515 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4517 error ("use -gdwarf -g%d for DWARF v1, level %d",
4520 error ("use -gdwarf-2 for DWARF v2");
4523 if (level
> max_debug_level
)
4526 ignoring option `%s' due to invalid debug level specification",
4528 level
= debug_info_level
;
4531 if (type
== NO_DEBUG
)
4533 type
= PREFERRED_DEBUGGING_TYPE
;
4535 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4537 #ifdef DWARF2_DEBUGGING_INFO
4538 type
= DWARF2_DEBUG
;
4540 #ifdef DBX_DEBUGGING_INFO
4547 if (type
== NO_DEBUG
)
4548 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4550 /* Does it conflict with an already selected type? */
4551 if (type_explicitly_set_p
4552 /* -g/-ggdb don't conflict with anything. */
4553 && da
->debug_type
!= NO_DEBUG
4554 && type
!= selected_debug_type
)
4555 warning ("`%s' ignored, conflicts with `-g%s'",
4556 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4559 /* If the format has already been set, -g/-ggdb
4560 only change the debug level. */
4561 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4562 /* Don't change debugging type. */
4566 selected_debug_type
= type
;
4567 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4570 write_symbols
= (level
== 0
4572 : selected_debug_type
);
4573 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4574 debug_info_level
= (enum debug_info_level
) level
;
4587 /* Decode the first argument in the argv as a language-independent option.
4588 Return the number of strings consumed. */
4591 independent_decode_option (int argc
, char **argv
)
4593 char *arg
= argv
[0];
4595 if (arg
[0] != '-' || arg
[1] == 0)
4600 if (!strcmp (arg
, "-help"))
4603 exit_after_options
= 1;
4607 if (!strcmp (arg
, "-target-help"))
4609 display_target_options ();
4610 exit_after_options
= 1;
4614 if (!strcmp (arg
, "-version"))
4616 print_version (stderr
, "");
4617 exit_after_options
= 1;
4621 /* Handle '--param <name>=<value>'. */
4622 if (strcmp (arg
, "-param") == 0)
4628 error ("-param option missing argument");
4632 /* Get the '<name>=<value>' parameter. */
4634 /* Look for the `='. */
4635 equal
= strchr (arg
, '=');
4637 error ("invalid --param option: %s", arg
);
4642 /* Zero out the `=' sign so that we get two separate strings. */
4644 /* Figure out what value is specified. */
4645 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4646 if (val
!= INVALID_PARAM_VAL
)
4647 set_param_value (arg
, val
);
4649 error ("invalid parameter value `%s'", equal
+ 1);
4661 /* Already been treated in main (). Do nothing. */
4665 set_target_switch (arg
+ 1);
4669 return decode_f_option (arg
+ 1);
4672 return decode_g_option (arg
+ 1);
4675 if (!strcmp (arg
, "dumpbase"))
4681 dump_base_name
= argv
[1];
4686 decode_d_option (arg
+ 1);
4690 if (!strcmp (arg
, "pedantic"))
4692 else if (!strcmp (arg
, "pedantic-errors"))
4693 flag_pedantic_errors
= pedantic
= 1;
4694 else if (arg
[1] == 0)
4701 if (!strcmp (arg
, "version"))
4709 inhibit_warnings
= 1;
4715 /* For backward compatibility, -W is the same as -Wextra. */
4719 return decode_W_option (arg
+ 1);
4723 if (!strncmp (arg
, "aux-info", 8))
4730 aux_info_file_name
= argv
[1];
4731 flag_gen_aux_info
= 1;
4734 else if (arg
[8] == '=')
4736 aux_info_file_name
= arg
+ 9;
4737 flag_gen_aux_info
= 1;
4742 else if (!strcmp (arg
, "auxbase"))
4748 aux_base_name
= argv
[1];
4752 else if (!strcmp (arg
, "auxbase-strip"))
4759 strip_off_ending (argv
[1], strlen (argv
[1]));
4761 aux_base_name
= argv
[1];
4776 asm_file_name
= argv
[1];
4791 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4796 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4800 if (g_switch_val
== -1)
4804 g_switch_set
= TRUE
;
4805 g_switch_value
= g_switch_val
;
4815 /* Decode -m switches. */
4816 /* Decode the switch -mNAME. */
4819 set_target_switch (const char *name
)
4822 int valid_target_option
= 0;
4824 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4825 if (!strcmp (target_switches
[j
].name
, name
))
4827 if (target_switches
[j
].value
< 0)
4828 target_flags
&= ~-target_switches
[j
].value
;
4830 target_flags
|= target_switches
[j
].value
;
4833 if (target_switches
[j
].value
< 0)
4834 target_flags_explicit
|= -target_switches
[j
].value
;
4836 target_flags_explicit
|= target_switches
[j
].value
;
4838 valid_target_option
= 1;
4841 #ifdef TARGET_OPTIONS
4842 if (!valid_target_option
)
4843 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4845 int len
= strlen (target_options
[j
].prefix
);
4846 if (target_options
[j
].value
)
4848 if (!strcmp (target_options
[j
].prefix
, name
))
4850 *target_options
[j
].variable
= target_options
[j
].value
;
4851 valid_target_option
= 1;
4856 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4858 *target_options
[j
].variable
= name
+ len
;
4859 valid_target_option
= 1;
4865 if (!valid_target_option
)
4866 error ("invalid option `%s'", name
);
4869 /* Print version information to FILE.
4870 Each line begins with INDENT (for the case where FILE is the
4871 assembler output file). */
4874 print_version (FILE *file
, const char *indent
)
4877 #define __VERSION__ "[?]"
4881 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4883 "%s%s%s version %s (%s) compiled by CC.\n"
4885 , indent
, *indent
!= 0 ? " " : "",
4886 lang_hooks
.name
, version_string
, TARGET_NAME
,
4887 indent
, __VERSION__
);
4888 fnotice (file
, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4889 indent
, *indent
!= 0 ? " " : "",
4890 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
4893 /* Print an option value and return the adjusted position in the line.
4894 ??? We don't handle error returns from fprintf (disk full); presumably
4895 other code will catch a disk full though. */
4898 print_single_switch (FILE *file
, int pos
, int max
,
4899 const char *indent
, const char *sep
, const char *term
,
4900 const char *type
, const char *name
)
4902 /* The ultrix fprintf returns 0 on success, so compute the result we want
4903 here since we need it for the following test. */
4904 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4909 fprintf (file
, "%s", term
);
4914 fprintf (file
, "%s", indent
);
4915 pos
= strlen (indent
);
4917 fprintf (file
, "%s%s%s", sep
, type
, name
);
4922 /* Print active target switches to FILE.
4923 POS is the current cursor position and MAX is the size of a "line".
4924 Each line begins with INDENT and ends with TERM.
4925 Each switch is separated from the next by SEP. */
4928 print_switch_values (FILE *file
, int pos
, int max
,
4929 const char *indent
, const char *sep
, const char *term
)
4934 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4935 that it can be printed below. This helps reproducibility. Of
4936 course, the string may never be used, but we can't tell that at
4937 this point in the compile. */
4938 default_flag_random_seed ();
4940 /* Print the options as passed. */
4942 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4943 _("options passed: "), "");
4945 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4949 if (strcmp (*p
, "-o") == 0)
4955 if (strcmp (*p
, "-quiet") == 0)
4957 if (strcmp (*p
, "-version") == 0)
4962 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4965 fprintf (file
, "%s", term
);
4967 /* Print the -f and -m options that have been enabled.
4968 We don't handle language specific options but printing argv
4971 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4972 _("options enabled: "), "");
4974 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4975 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4976 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4977 "-f", f_options
[j
].string
);
4979 /* Print target specific options. */
4981 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4982 if (target_switches
[j
].name
[0] != '\0'
4983 && target_switches
[j
].value
> 0
4984 && ((target_switches
[j
].value
& target_flags
)
4985 == target_switches
[j
].value
))
4987 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4988 "-m", target_switches
[j
].name
);
4991 #ifdef TARGET_OPTIONS
4992 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4993 if (*target_options
[j
].variable
!= NULL
)
4996 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4997 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4998 prefix
, *target_options
[j
].variable
);
5002 fprintf (file
, "%s", term
);
5005 /* Open assembly code output file. Do this even if -fsyntax-only is
5006 on, because then the driver will have provided the name of a
5007 temporary file or bit bucket for us. NAME is the file specified on
5008 the command line, possibly NULL. */
5010 init_asm_output (const char *name
)
5012 if (name
== NULL
&& asm_file_name
== 0)
5013 asm_out_file
= stdout
;
5016 if (asm_file_name
== 0)
5018 int len
= strlen (dump_base_name
);
5019 char *dumpname
= (char *) xmalloc (len
+ 6);
5020 memcpy (dumpname
, dump_base_name
, len
+ 1);
5021 strip_off_ending (dumpname
, len
);
5022 strcat (dumpname
, ".s");
5023 asm_file_name
= dumpname
;
5025 if (!strcmp (asm_file_name
, "-"))
5026 asm_out_file
= stdout
;
5028 asm_out_file
= fopen (asm_file_name
, "w+");
5029 if (asm_out_file
== 0)
5030 fatal_error ("can't open %s for writing: %m", asm_file_name
);
5033 #ifdef IO_BUFFER_SIZE
5034 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
5035 _IOFBF
, IO_BUFFER_SIZE
);
5038 if (!flag_syntax_only
)
5040 #ifdef ASM_FILE_START
5041 ASM_FILE_START (asm_out_file
);
5044 #ifdef ASM_COMMENT_START
5045 if (flag_verbose_asm
)
5047 /* Print the list of options in effect. */
5048 print_version (asm_out_file
, ASM_COMMENT_START
);
5049 print_switch_values (asm_out_file
, 0, MAX_LINE
,
5050 ASM_COMMENT_START
, " ", "\n");
5051 /* Add a blank line here so it appears in assembler output but not
5053 fprintf (asm_out_file
, "\n");
5059 /* Initialization of the front end environment, before command line
5060 options are parsed. Signal handlers, internationalization etc.
5061 ARGV0 is main's argv[0]. */
5063 general_init (char *argv0
)
5067 p
= argv0
+ strlen (argv0
);
5068 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
5072 xmalloc_set_program_name (progname
);
5076 gcc_init_libintl ();
5078 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
5080 signal (SIGSEGV
, crash_signal
);
5083 signal (SIGILL
, crash_signal
);
5086 signal (SIGBUS
, crash_signal
);
5089 signal (SIGABRT
, crash_signal
);
5091 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
5092 signal (SIGIOT
, crash_signal
);
5095 signal (SIGFPE
, crash_signal
);
5098 /* Other host-specific signal setup. */
5099 (*host_hooks
.extra_signals
)();
5101 /* Initialize the diagnostics reporting machinery, so option parsing
5102 can give warnings and errors. */
5103 diagnostic_initialize (global_dc
);
5105 /* Initialize the garbage-collector, string pools and tree type hash
5112 /* Parse command line options and set default flag values, called
5113 after language-independent option-independent initialization. Do
5114 minimal options processing. Outputting diagnostics is OK, but GC
5115 and identifier hashtables etc. are not initialized yet.
5117 Return nonzero to suppress compiler back end initialization. */
5119 parse_options_and_default_flags (int argc
, char **argv
)
5123 /* Save in case md file wants to emit args as a comment. */
5127 /* Initialize register usage now so switches may override. */
5130 /* Register the language-independent parameters. */
5131 add_params (lang_independent_params
, LAST_PARAM
);
5133 /* This must be done after add_params but before argument processing. */
5134 init_ggc_heuristics();
5136 /* Perform language-specific options initialization. */
5137 lang_mask
= (*lang_hooks
.init_options
) ();
5139 /* Scan to see what optimization level has been specified. That will
5140 determine the default value of many flags. */
5141 for (i
= 1; i
< argc
; i
++)
5143 if (!strcmp (argv
[i
], "-O"))
5148 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
5150 /* Handle -Os, -O2, -O3, -O69, ... */
5151 char *p
= &argv
[i
][2];
5153 if ((p
[0] == 's') && (p
[1] == 0))
5157 /* Optimizing for size forces optimize to be 2. */
5162 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
5163 if (optimize_val
!= -1)
5165 optimize
= optimize_val
;
5174 flag_merge_constants
= 0;
5180 flag_thread_jumps
= 1;
5182 flag_delayed_branch
= 1;
5184 #ifdef CAN_DEBUG_WITHOUT_FP
5185 flag_omit_frame_pointer
= 1;
5187 flag_guess_branch_prob
= 1;
5188 flag_cprop_registers
= 1;
5189 flag_loop_optimize
= 1;
5190 flag_crossjumping
= 1;
5191 flag_if_conversion
= 1;
5192 flag_if_conversion2
= 1;
5197 flag_optimize_sibling_calls
= 1;
5198 flag_cse_follow_jumps
= 1;
5199 flag_cse_skip_blocks
= 1;
5201 flag_expensive_optimizations
= 1;
5202 flag_strength_reduce
= 1;
5203 flag_rerun_cse_after_loop
= 1;
5204 flag_rerun_loop_opt
= 1;
5205 flag_caller_saves
= 1;
5208 #ifdef INSN_SCHEDULING
5209 flag_schedule_insns
= 1;
5210 flag_schedule_insns_after_reload
= 1;
5213 flag_strict_aliasing
= 1;
5214 flag_delete_null_pointer_checks
= 1;
5215 flag_reorder_blocks
= 1;
5216 flag_reorder_functions
= 1;
5221 flag_inline_functions
= 1;
5222 flag_rename_registers
= 1;
5223 flag_unswitch_loops
= 1;
5224 flag_unit_at_a_time
= 1;
5227 if (optimize
< 2 || optimize_size
)
5232 align_functions
= 1;
5234 /* Don't reorder blocks when optimizing for size because extra
5235 jump insns may be created; also barrier may create extra padding.
5237 More correctly we should have a block reordering mode that tried
5238 to minimize the combined size of all the jumps. This would more
5239 or less automatically remove extra jumps, but would also try to
5240 use more short jumps instead of long jumps. */
5241 flag_reorder_blocks
= 0;
5244 /* Initialize whether `char' is signed. */
5245 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
5246 #ifdef DEFAULT_SHORT_ENUMS
5247 /* Initialize how much space enums occupy, by default. */
5248 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
5251 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5254 set_target_switch ("");
5256 /* Unwind tables are always present in an ABI-conformant IA-64
5257 object file, so the default should be ON. */
5258 #ifdef IA64_UNWIND_INFO
5259 flag_unwind_tables
= IA64_UNWIND_INFO
;
5262 #ifdef OPTIMIZATION_OPTIONS
5263 /* Allow default optimizations to be specified on a per-machine basis. */
5264 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
5267 /* Perform normal command line switch decoding. */
5268 for (i
= 1; i
< argc
;)
5271 int indep_processed
;
5273 /* Give the language a chance to decode the option for itself. */
5274 lang_processed
= handle_option (argc
- i
, argv
+ i
, lang_mask
);
5276 if (lang_processed
>= 0)
5277 /* Now see if the option also has a language independent meaning.
5278 Some options are both language specific and language independent,
5280 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
5283 lang_processed
= -lang_processed
;
5284 indep_processed
= 0;
5287 if (lang_processed
|| indep_processed
)
5288 i
+= MAX (lang_processed
, indep_processed
);
5291 const char *option
= NULL
;
5292 const char *lang
= NULL
;
5295 /* It is possible that the command line switch is not valid for the
5296 current language, but it is valid for another language. In order
5297 to be compatible with previous versions of the compiler (which
5298 did not issue an error message in this case) we check for this
5299 possibility here. If we do find a match, then if extra_warnings
5300 is set we generate a warning message, otherwise we will just
5301 ignore the option. */
5302 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
5304 option
= documented_lang_options
[j
].option
;
5307 lang
= documented_lang_options
[j
].description
;
5308 else if (! strncmp (argv
[i
], option
, strlen (option
)))
5312 if (j
!= ARRAY_SIZE (documented_lang_options
))
5316 warning ("ignoring command line option '%s'", argv
[i
]);
5319 ("(it is valid for %s but not the selected language)",
5323 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
5324 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
5326 error ("unrecognized option `%s'", argv
[i
]);
5333 flag_pic
= flag_pie
;
5334 if (flag_pic
&& !flag_pie
)
5337 if (flag_no_inline
== 2)
5340 flag_really_no_inline
= flag_no_inline
;
5342 /* Set flag_no_inline before the post_options () hook. The C front
5343 ends use it to determine tree inlining defaults. FIXME: such
5344 code should be lang-independent when all front ends use tree
5345 inlining, in which case it, and this condition, should be moved
5346 to the top of process_options() instead. */
5349 /* Inlining does not work if not optimizing,
5350 so force it not to be done. */
5354 /* The c_decode_option function and decode_option hook set
5355 this to `2' if -Wall is used, so we can avoid giving out
5356 lots of errors for people who don't realize what -Wall does. */
5357 if (warn_uninitialized
== 1)
5358 warning ("-Wuninitialized is not supported without -O");
5361 if (flag_really_no_inline
== 2)
5362 flag_really_no_inline
= flag_no_inline
;
5365 /* Process the options that have been parsed. */
5367 process_options (void)
5369 /* Allow the front end to perform consistency checks and do further
5370 initialization based on the command line options. This hook also
5371 sets the original filename if appropriate (e.g. foo.i -> foo.c)
5372 so we can correctly initialize debug output. */
5373 no_backend
= (*lang_hooks
.post_options
) (&main_input_filename
);
5374 input_filename
= main_input_filename
;
5376 #ifdef OVERRIDE_OPTIONS
5377 /* Some machines may reject certain combinations of options. */
5381 /* Set aux_base_name if not already set. */
5384 else if (main_input_filename
)
5386 char *name
= xstrdup (lbasename (main_input_filename
));
5388 strip_off_ending (name
, strlen (name
));
5389 aux_base_name
= name
;
5392 aux_base_name
= "gccaux";
5394 /* Set up the align_*_log variables, defaulting them to 1 if they
5395 were still unset. */
5396 if (align_loops
<= 0) align_loops
= 1;
5397 if (align_loops_max_skip
> align_loops
|| !align_loops
)
5398 align_loops_max_skip
= align_loops
- 1;
5399 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
5400 if (align_jumps
<= 0) align_jumps
= 1;
5401 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
5402 align_jumps_max_skip
= align_jumps
- 1;
5403 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
5404 if (align_labels
<= 0) align_labels
= 1;
5405 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
5406 if (align_labels_max_skip
> align_labels
|| !align_labels
)
5407 align_labels_max_skip
= align_labels
- 1;
5408 if (align_functions
<= 0) align_functions
= 1;
5409 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
5411 /* Unrolling all loops implies that standard loop unrolling must also
5413 if (flag_unroll_all_loops
)
5414 flag_unroll_loops
= 1;
5416 if (flag_unroll_loops
)
5418 flag_old_unroll_loops
= 0;
5419 flag_old_unroll_all_loops
= 0;
5422 if (flag_old_unroll_all_loops
)
5423 flag_old_unroll_loops
= 1;
5425 /* Old loop unrolling requires that strength_reduction be on also. Silently
5426 turn on strength reduction here if it isn't already on. Also, the loop
5427 unrolling code assumes that cse will be run after loop, so that must
5428 be turned on also. */
5429 if (flag_old_unroll_loops
)
5431 flag_strength_reduce
= 1;
5432 flag_rerun_cse_after_loop
= 1;
5434 if (flag_unroll_loops
|| flag_peel_loops
)
5435 flag_rerun_cse_after_loop
= 1;
5437 if (flag_non_call_exceptions
)
5438 flag_asynchronous_unwind_tables
= 1;
5439 if (flag_asynchronous_unwind_tables
)
5440 flag_unwind_tables
= 1;
5442 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5444 if (flag_unit_at_a_time
&& ! lang_hooks
.callgraph
.expand_function
)
5445 flag_unit_at_a_time
= 0;
5447 /* Warn about options that are not supported on this machine. */
5448 #ifndef INSN_SCHEDULING
5449 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
5450 warning ("instruction scheduling not supported on this target machine");
5453 if (flag_delayed_branch
)
5454 warning ("this target machine does not have delayed branches");
5457 user_label_prefix
= USER_LABEL_PREFIX
;
5458 if (flag_leading_underscore
!= -1)
5460 /* If the default prefix is more complicated than "" or "_",
5461 issue a warning and ignore this option. */
5462 if (user_label_prefix
[0] == 0 ||
5463 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
5465 user_label_prefix
= flag_leading_underscore
? "_" : "";
5468 warning ("-f%sleading-underscore not supported on this target machine",
5469 flag_leading_underscore
? "" : "no-");
5472 /* If we are in verbose mode, write out the version and maybe all the
5473 option flags in use. */
5476 print_version (stderr
, "");
5478 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
5481 if (flag_syntax_only
)
5483 write_symbols
= NO_DEBUG
;
5487 /* Now we know write_symbols, set up the debug hooks based on it.
5488 By default we do nothing for debug output. */
5489 #if defined(DBX_DEBUGGING_INFO)
5490 if (write_symbols
== DBX_DEBUG
)
5491 debug_hooks
= &dbx_debug_hooks
;
5493 #if defined(XCOFF_DEBUGGING_INFO)
5494 if (write_symbols
== XCOFF_DEBUG
)
5495 debug_hooks
= &xcoff_debug_hooks
;
5497 #ifdef SDB_DEBUGGING_INFO
5498 if (write_symbols
== SDB_DEBUG
)
5499 debug_hooks
= &sdb_debug_hooks
;
5501 #ifdef DWARF_DEBUGGING_INFO
5502 if (write_symbols
== DWARF_DEBUG
)
5503 debug_hooks
= &dwarf_debug_hooks
;
5505 #ifdef DWARF2_DEBUGGING_INFO
5506 if (write_symbols
== DWARF2_DEBUG
)
5507 debug_hooks
= &dwarf2_debug_hooks
;
5509 #ifdef VMS_DEBUGGING_INFO
5510 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
5511 debug_hooks
= &vmsdbg_debug_hooks
;
5514 /* If auxiliary info generation is desired, open the output file.
5515 This goes in the same directory as the source file--unlike
5516 all the other output files. */
5517 if (flag_gen_aux_info
)
5519 aux_info_file
= fopen (aux_info_file_name
, "w");
5520 if (aux_info_file
== 0)
5521 fatal_error ("can't open %s: %m", aux_info_file_name
);
5524 if (! targetm
.have_named_sections
)
5526 if (flag_function_sections
)
5528 warning ("-ffunction-sections not supported for this target");
5529 flag_function_sections
= 0;
5531 if (flag_data_sections
)
5533 warning ("-fdata-sections not supported for this target");
5534 flag_data_sections
= 0;
5538 if (flag_function_sections
&& profile_flag
)
5540 warning ("-ffunction-sections disabled; it makes profiling impossible");
5541 flag_function_sections
= 0;
5544 #ifndef HAVE_prefetch
5545 if (flag_prefetch_loop_arrays
)
5547 warning ("-fprefetch-loop-arrays not supported for this target");
5548 flag_prefetch_loop_arrays
= 0;
5551 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
5553 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5554 flag_prefetch_loop_arrays
= 0;
5558 /* This combination of options isn't handled for i386 targets and doesn't
5559 make much sense anyway, so don't allow it. */
5560 if (flag_prefetch_loop_arrays
&& optimize_size
)
5562 warning ("-fprefetch-loop-arrays is not supported with -Os");
5563 flag_prefetch_loop_arrays
= 0;
5566 #ifndef OBJECT_FORMAT_ELF
5567 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5568 warning ("-ffunction-sections may affect debugging on some targets");
5571 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5572 if (flag_signaling_nans
)
5573 flag_trapping_math
= 1;
5576 /* Initialize the compiler back end. */
5580 /* init_emit_once uses reg_raw_mode and therefore must be called
5581 after init_regs which initialized reg_raw_mode. */
5583 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5584 || debug_info_level
== DINFO_LEVEL_VERBOSE
5585 #ifdef VMS_DEBUGGING_INFO
5586 /* Enable line number info for traceback */
5587 || debug_info_level
> DINFO_LEVEL_NONE
5589 || flag_test_coverage
5590 || warn_notreached
);
5591 init_fake_stack_mems ();
5595 init_function_once ();
5596 init_varasm_once ();
5598 /* The following initialization functions need to generate rtl, so
5599 provide a dummy function context for them. */
5600 init_dummy_function_start ();
5602 if (flag_caller_saves
)
5603 init_caller_save ();
5604 expand_dummy_function_end ();
5607 /* Language-dependent initialization. Returns nonzero on success. */
5609 lang_dependent_init (const char *name
)
5611 if (dump_base_name
== 0)
5612 dump_base_name
= name
? name
: "gccdump";
5614 /* Other front-end initialization. */
5615 if ((*lang_hooks
.init
) () == 0)
5618 init_asm_output (name
);
5620 /* These create various _DECL nodes, so need to be called after the
5621 front end is initialized. */
5625 /* The following initialization functions need to generate rtl, so
5626 provide a dummy function context for them. */
5627 init_dummy_function_start ();
5629 expand_dummy_function_end ();
5631 /* If dbx symbol table desired, initialize writing it and output the
5632 predefined types. */
5633 timevar_push (TV_SYMOUT
);
5635 #ifdef DWARF2_UNWIND_INFO
5636 if (dwarf2out_do_frame ())
5637 dwarf2out_frame_init ();
5640 /* Now we have the correct original filename, we can initialize
5642 (*debug_hooks
->init
) (name
);
5644 timevar_pop (TV_SYMOUT
);
5649 /* Clean up: close opened files, etc. */
5654 /* Close the dump files. */
5655 if (flag_gen_aux_info
)
5657 fclose (aux_info_file
);
5659 unlink (aux_info_file_name
);
5662 /* Close non-debugging input and output files. Take special care to note
5663 whether fclose returns an error, since the pages might still be on the
5664 buffer chain while the file is open. */
5668 if (ferror (asm_out_file
) != 0)
5669 fatal_error ("error writing to %s: %m", asm_file_name
);
5670 if (fclose (asm_out_file
) != 0)
5671 fatal_error ("error closing %s: %m", asm_file_name
);
5674 /* Do whatever is necessary to finish printing the graphs. */
5675 if (graph_dump_format
!= no_graph
)
5679 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5680 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5685 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5686 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5687 finish_graph_dump_file (dump_base_name
, suffix
);
5694 ggc_print_statistics ();
5695 stringpool_statistics ();
5696 dump_tree_statistics ();
5699 /* Free up memory for the benefit of leak detectors. */
5702 /* Language-specific end of compilation actions. */
5703 (*lang_hooks
.finish
) ();
5706 /* Initialize the compiler, and compile the input file. */
5710 /* Initialize timing first. The C front ends read the main file in
5711 the post_options hook, and C++ does file timings. */
5712 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
5714 timevar_start (TV_TOTAL
);
5718 /* Don't do any more if an error has already occurred. */
5721 /* Set up the back-end if requested. */
5725 /* Language-dependent initialization. Returns true on success. */
5726 if (lang_dependent_init (main_input_filename
))
5732 /* Stop timing and print the times. */
5733 timevar_stop (TV_TOTAL
);
5734 timevar_print (stderr
);
5737 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5738 Decode command args, then call compile_file.
5739 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5740 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5742 It is not safe to call this function more than once. */
5745 toplev_main (int argc
, char **argv
)
5747 /* Initialization of GCC's environment, and diagnostics. */
5748 general_init (argv
[0]);
5750 /* Parse the options and do minimal processing; basically just
5751 enough to default flags appropriately. */
5752 parse_options_and_default_flags (argc
, argv
);
5754 /* Exit early if we can (e.g. -help). */
5755 if (!exit_after_options
)
5758 if (errorcount
|| sorrycount
)
5759 return (FATAL_EXIT_CODE
);
5761 return (SUCCESS_EXIT_CODE
);