1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
49 #include "insn-attr.h"
50 #include "insn-config.h"
51 #include "insn-flags.h"
52 #include "hard-reg-set.h"
59 #include "basic-block.h"
66 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
81 #include "value-prof.h"
82 #include "alloc-pool.h"
84 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
85 #include "dwarf2out.h"
88 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
92 #ifdef SDB_DEBUGGING_INFO
96 #ifdef XCOFF_DEBUGGING_INFO
97 #include "xcoffout.h" /* Needed for external data
98 declarations for e.g. AIX 4.x. */
101 static void general_init (const char *);
102 static void do_compile (void);
103 static void process_options (void);
104 static void backend_init (void);
105 static int lang_dependent_init (const char *);
106 static void init_asm_output (const char *);
107 static void finalize (void);
109 static void crash_signal (int) ATTRIBUTE_NORETURN;
110 static void setup_core_dumping (void);
111 static void compile_file (void);
113 static int print_single_switch (FILE *, int, int, const char *,
114 const char *, const char *,
115 const char *, const char *);
116 static void print_switch_values (FILE *, int, int, const char *,
117 const char *, const char *);
119 /* Nonzero to dump debug info whilst parsing (-dy option). */
120 static int set_yydebug;
122 /* True if we don't need a backend (e.g. preprocessing only). */
123 static bool no_backend;
125 /* Length of line when printing switch values. */
128 /* Name of program invoked, sans directories. */
130 const char *progname;
132 /* Copy of argument vector to toplev_main. */
133 static const char **save_argv;
135 /* Name of top-level original source file (what was input to cpp).
136 This comes from the #-command at the beginning of the actual input.
137 If there isn't any there, then this is the cc1 input file name. */
139 const char *main_input_filename;
141 /* Current position in real source file. */
143 location_t input_location;
145 struct line_maps line_table;
147 /* Nonzero if it is unsafe to create any new pseudo registers. */
150 /* Stack of currently pending input files. */
152 struct file_stack *input_file_stack;
154 /* Incremented on each change to input_file_stack. */
155 int input_file_stack_tick;
157 /* Name to use as base of names for dump output files. */
159 const char *dump_base_name;
161 /* Name to use as a base for auxiliary output files. */
163 const char *aux_base_name;
165 /* Bit flags that specify the machine subtype we are compiling for.
166 Bits are tested using macros TARGET_... defined in the tm.h file
167 and set by `-m...' switches. Must be defined in rtlanal.c. */
169 extern int target_flags;
171 /* A mask of target_flags that includes bit X if X was set or cleared
172 on the command line. */
174 int target_flags_explicit;
176 /* Debug hooks - dependent upon command line options. */
178 const struct gcc_debug_hooks *debug_hooks;
180 /* Other flags saying which kinds of debugging dump have been requested. */
182 int rtl_dump_and_exit;
183 int flag_print_asm_name;
184 enum graph_dump_types graph_dump_format;
186 /* Name for output file of assembly code, specified with -o. */
188 const char *asm_file_name;
190 /* Nonzero means do optimizations. -O.
191 Particular numeric values stand for particular amounts of optimization;
192 thus, -O2 stores 2 here. However, the optimizations beyond the basic
193 ones are not controlled directly by this variable. Instead, they are
194 controlled by individual `flag_...' variables that are defaulted
195 based on this variable. */
199 /* Nonzero means optimize for size. -Os.
200 The only valid values are zero and nonzero. When optimize_size is
201 nonzero, optimize defaults to 2, but certain individual code
202 bloating optimizations are disabled. */
204 int optimize_size = 0;
206 /* The FUNCTION_DECL for the function currently being compiled,
207 or 0 if between functions. */
208 tree current_function_decl;
210 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
212 tree current_function_func_begin_label;
214 /* Nonzero if doing dwarf2 duplicate elimination. */
216 int flag_eliminate_dwarf2_dups = 0;
218 /* Nonzero if doing unused type elimination. */
220 int flag_eliminate_unused_debug_types = 1;
222 /* Nonzero means emit debugging information only for symbols which are used. */
223 int flag_debug_only_used_symbols = 0;
225 /* Nonzero if generating code to do profiling. */
227 int profile_flag = 0;
229 /* Nonzero if generating code to profile program flow graph arcs. */
231 int profile_arc_flag = 0;
233 /* Nonzero if value histograms should be measured. */
235 int flag_profile_values = 0;
237 /* Nonzero if value histograms should be used to optimize code. */
238 int flag_value_profile_transformations = 0;
240 /* Nonzero if generating info for gcov to calculate line test coverage. */
242 int flag_test_coverage = 0;
244 /* Nonzero indicates that branch taken probabilities should be calculated. */
246 int flag_branch_probabilities = 0;
248 /* Nonzero if basic blocks should be reordered. */
250 int flag_reorder_blocks = 0;
252 /* Nonzero if functions should be reordered. */
254 int flag_reorder_functions = 0;
256 /* Nonzero if registers should be renamed. */
258 int flag_rename_registers = 0;
259 int flag_cprop_registers = 0;
261 /* Nonzero for -pedantic switch: warn about anything
262 that standard spec forbids. */
266 /* Temporarily suppress certain warnings.
267 This is set while reading code from a system header file. */
269 int in_system_header = 0;
271 /* Don't print functions as they are compiled. -quiet. */
275 /* Print times taken by the various passes. -ftime-report. */
279 /* Print memory still in use at end of compilation (which may have little
280 to do with peak memory consumption). -fmem-report. */
284 /* Nonzero means to collect statistics which might be expensive
285 and to print them when we are done. */
286 int flag_detailed_statistics = 0;
288 /* A random sequence of characters, unless overridden by user. */
289 const char *flag_random_seed;
291 /* A local time stamp derived from the time of compilation. It will be
292 zero if the system cannot provide a time. It will be -1u, if the
293 user has specified a particular random seed. */
298 /* Nonzero means `char' should be signed. */
300 int flag_signed_char;
302 /* Nonzero means give an enum type only as many bytes as it needs. */
304 int flag_short_enums;
306 /* Nonzero for -fcaller-saves: allocate values in regs that need to
307 be saved across function calls, if that produces overall better code.
308 Optional now, so people can test it. */
310 int flag_caller_saves = 0;
312 /* Nonzero if structures and unions should be returned in memory.
314 This should only be defined if compatibility with another compiler or
315 with an ABI is needed, because it results in slower code. */
317 #ifndef DEFAULT_PCC_STRUCT_RETURN
318 #define DEFAULT_PCC_STRUCT_RETURN 1
321 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
323 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
325 /* Nonzero for -fforce-mem: load memory value into a register
326 before arithmetic on it. This makes better cse but slower compilation. */
328 int flag_force_mem = 0;
330 /* Nonzero for -fforce-addr: load memory address into a register before
331 reference to memory. This makes better cse but slower compilation. */
333 int flag_force_addr = 0;
335 /* Nonzero for -fdefer-pop: don't pop args after each function call;
336 instead save them up to pop many calls' args with one insns. */
338 int flag_defer_pop = 0;
340 /* Nonzero for -ffloat-store: don't allocate floats and doubles
341 in extended-precision registers. */
343 int flag_float_store = 0;
345 /* Nonzero for -fcse-follow-jumps:
346 have cse follow jumps to do a more extensive job. */
348 int flag_cse_follow_jumps;
350 /* Nonzero for -fcse-skip-blocks:
351 have cse follow a branch around a block. */
352 int flag_cse_skip_blocks;
354 /* Nonzero for -fexpensive-optimizations:
355 perform miscellaneous relatively-expensive optimizations. */
356 int flag_expensive_optimizations;
358 /* Nonzero for -fthread-jumps:
359 have jump optimize output of loop. */
361 int flag_thread_jumps;
363 /* Nonzero enables strength-reduction in loop.c. */
365 int flag_strength_reduce = 0;
367 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
368 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
369 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
372 int flag_old_unroll_loops;
374 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
375 This is generally not a win. */
377 int flag_old_unroll_all_loops;
379 /* Enables unrolling of simple loops in loop-unroll.c. */
380 int flag_unroll_loops;
382 /* Enables unrolling of all loops in loop-unroll.c. */
383 int flag_unroll_all_loops;
385 /* Nonzero enables loop peeling. */
388 /* Nonzero enables loop unswitching. */
389 int flag_unswitch_loops;
391 /* Nonzero enables prefetch optimizations for arrays in loops. */
393 int flag_prefetch_loop_arrays;
395 /* Nonzero forces all invariant computations in loops to be moved
398 int flag_move_all_movables = 0;
400 /* Nonzero forces all general induction variables in loops to be
403 int flag_reduce_all_givs = 0;
405 /* Nonzero to perform full register move optimization passes. This is the
408 int flag_regmove = 0;
410 /* Nonzero means don't put addresses of constant functions in registers.
411 Used for compiling the Unix kernel, where strange substitutions are
412 done on the assembly output. */
414 int flag_no_function_cse = 0;
416 /* Nonzero for -fomit-frame-pointer:
417 don't make a frame pointer in simple functions that don't require one. */
419 int flag_omit_frame_pointer = 0;
421 /* Nonzero means place each function into its own section on those platforms
422 which support arbitrary section names and unlimited numbers of sections. */
424 int flag_function_sections = 0;
426 /* ... and similar for data. */
428 int flag_data_sections = 0;
430 /* Nonzero to inhibit use of define_optimization peephole opts. */
432 int flag_no_peephole = 0;
434 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
436 int flag_optimize_sibling_calls = 0;
438 /* Nonzero means the front end generally wants `errno' maintained by math
439 operations, like built-in SQRT. */
441 int flag_errno_math = 1;
443 /* Nonzero means that unsafe floating-point math optimizations are allowed
444 for the sake of speed. IEEE compliance is not guaranteed, and operations
445 are allowed to assume that their arguments and results are "normal"
446 (e.g., nonnegative for SQRT). */
448 int flag_unsafe_math_optimizations = 0;
450 /* Nonzero means that no NaNs or +-Infs are expected. */
452 int flag_finite_math_only = 0;
454 /* Zero means that floating-point math operations cannot generate a
455 (user-visible) trap. This is the case, for example, in nonstop
456 IEEE 754 arithmetic. Trapping conditions include division by zero,
457 overflow, underflow, invalid and inexact, but does not include
458 operations on signaling NaNs (see below). */
460 int flag_trapping_math = 1;
462 /* Nonzero means disable transformations that assume default floating
463 point rounding behavior. */
465 int flag_rounding_math = 0;
467 /* Nonzero means disable transformations observable by signaling NaNs.
468 This option implies that any operation on an IEEE signaling NaN can
469 generate a (user-visible) trap. */
471 int flag_signaling_nans = 0;
473 /* 0 means straightforward implementation of complex divide acceptable.
474 1 means wide ranges of inputs must work for complex divide.
475 2 means C99-like requirements for complex divide (not yet implemented). */
477 int flag_complex_divide_method = 0;
479 /* Nonzero means just do syntax checking; don't output anything. */
481 int flag_syntax_only = 0;
483 /* Nonzero means performs web construction pass. */
487 /* Nonzero means perform loop optimizer. */
489 int flag_loop_optimize;
491 /* Nonzero means perform crossjumping. */
493 int flag_crossjumping;
495 /* Nonzero means perform if conversion. */
497 int flag_if_conversion;
499 /* Nonzero means perform if conversion after reload. */
501 int flag_if_conversion2;
503 /* Nonzero means to use global dataflow analysis to eliminate
504 useless null pointer tests. */
506 int flag_delete_null_pointer_checks;
508 /* Nonzero means perform global CSE. */
512 /* Nonzero means to do the enhanced load motion during gcse, which trys
513 to hoist loads by not killing them when a store to the same location
516 int flag_gcse_lm = 1;
518 /* Nonzero means to perform store motion after gcse, which will try to
519 move stores closer to the exit block. Its not very effective without
522 int flag_gcse_sm = 1;
524 /* Nonzero if we want to perform redundant load after store elimination
527 int flag_gcse_las = 1;
529 /* Nonzero means perform global cse after register allocation. */
530 int flag_gcse_after_reload = 0;
532 /* Perform target register optimization before prologue / epilogue
535 int flag_branch_target_load_optimize = 0;
537 /* Perform target register optimization after prologue / epilogue
538 threading and jump2. */
540 int flag_branch_target_load_optimize2 = 0;
542 /* For the bt-load pass, nonzero means don't re-use branch target registers
543 in any basic block. */
545 int flag_btr_bb_exclusive;
547 /* Nonzero means to rerun cse after loop optimization. This increases
548 compilation time about 20% and picks up a few more common expressions. */
550 int flag_rerun_cse_after_loop;
552 /* Nonzero means to run loop optimizations twice. */
554 int flag_rerun_loop_opt;
556 /* Nonzero for -finline-functions: ok to inline functions that look like
557 good inline candidates. */
559 int flag_inline_functions;
561 /* Nonzero for -fkeep-inline-functions: even if we make a function
562 go inline everywhere, keep its definition around for debugging
565 int flag_keep_inline_functions;
567 /* Nonzero means that functions will not be inlined. */
569 int flag_no_inline = 2;
571 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
572 not just because the tree inliner turned us off. */
574 int flag_really_no_inline = 2;
576 /* Nonzero means that we should emit static const variables
577 regardless of whether or not optimization is turned on. */
579 int flag_keep_static_consts = 1;
581 /* Nonzero means we should be saving declaration info into a .X file. */
583 int flag_gen_aux_info = 0;
585 /* Specified name of aux-info file. */
587 const char *aux_info_file_name;
589 /* Nonzero means make the text shared if supported. */
591 int flag_shared_data;
593 /* Nonzero means schedule into delayed branch slots if supported. */
595 int flag_delayed_branch;
597 /* Nonzero if we are compiling pure (sharable) code.
598 Value is 1 if we are doing "small" pic; value is 2 if we're doing
603 /* Nonzero if we are compiling position independent code for executable.
604 The value is 1 if we are doing "small" pic; value is 2 if we're doing
609 /* Nonzero if we are compiling code for a shared library, zero for
614 /* Set to the default thread-local storage (tls) model to use. */
616 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
618 /* Nonzero means generate extra code for exception handling and enable
619 exception handling. */
623 /* Nonzero means generate frame unwind info table when supported. */
625 int flag_unwind_tables = 0;
627 /* Nonzero means generate frame unwind info table exact at each insn
630 int flag_asynchronous_unwind_tables = 0;
632 /* Nonzero means don't place uninitialized global data in common storage
637 /* Nonzero means change certain warnings into errors.
638 Usually these are warnings about failure to conform to some standard. */
640 int flag_pedantic_errors = 0;
642 /* flag_schedule_insns means schedule insns within basic blocks (before
644 flag_schedule_insns_after_reload means schedule insns after
647 int flag_schedule_insns = 0;
648 int flag_schedule_insns_after_reload = 0;
650 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
651 int flag_sched2_use_superblocks = 0;
653 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
655 int flag_sched2_use_traces = 0;
657 /* The following flags have effect only for scheduling before register
660 flag_schedule_interblock means schedule insns across basic blocks.
661 flag_schedule_speculative means allow speculative motion of non-load insns.
662 flag_schedule_speculative_load means allow speculative motion of some
664 flag_schedule_speculative_load_dangerous allows speculative motion of more
667 int flag_schedule_interblock = 1;
668 int flag_schedule_speculative = 1;
669 int flag_schedule_speculative_load = 0;
670 int flag_schedule_speculative_load_dangerous = 0;
672 /* The following flags have an effect during scheduling after register
675 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
676 of stalled insns into the ready list.
678 flag_sched_stalled_insns_dep controls how many insn groups will be examined
679 for a dependency on a stalled insn that is candidate for premature removal
680 from the queue of stalled insns into the ready list (has an effect only if
681 the flag 'sched_stalled_insns' is set). */
683 int flag_sched_stalled_insns = 0;
684 int flag_sched_stalled_insns_dep = 1;
686 int flag_single_precision_constant;
688 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
689 by a cheaper branch on a count register. */
690 int flag_branch_on_count_reg = 1;
692 /* -finhibit-size-directive inhibits output of .size for ELF.
693 This is used only for compiling crtstuff.c,
694 and it may be extended to other effects
695 needed for crtstuff.c on other systems. */
696 int flag_inhibit_size_directive = 0;
698 /* -fverbose-asm causes extra commentary information to be produced in
699 the generated assembly code (to make it more readable). This option
700 is generally only of use to those who actually need to read the
701 generated assembly code (perhaps while debugging the compiler itself).
702 -fno-verbose-asm, the default, causes the extra information
703 to be omitted and is useful when comparing two assembler files. */
705 int flag_verbose_asm = 0;
707 /* -dA causes debug commentary information to be produced in
708 the generated assembly code (to make it more readable). This option
709 is generally only of use to those who actually need to read the
710 generated assembly code (perhaps while debugging the compiler itself).
711 Currently, this switch is only used by dwarfout.c; however, it is intended
712 to be a catchall for printing debug information in the assembler file. */
714 int flag_debug_asm = 0;
716 /* -dP causes the rtl to be emitted as a comment in assembly. */
718 int flag_dump_rtl_in_asm = 0;
720 /* Nonzero means put zero initialized data in the bss section. */
721 int flag_zero_initialized_in_bss = 1;
723 /* Tag all structures with __attribute__(packed). */
724 int flag_pack_struct = 0;
726 /* Emit code to check for stack overflow; also may cause large objects
727 to be allocated dynamically. */
728 int flag_stack_check;
730 /* When non-NULL, indicates that whenever space is allocated on the
731 stack, the resulting stack pointer must not pass this
732 address---that is, for stacks that grow downward, the stack pointer
733 must always be greater than or equal to this address; for stacks
734 that grow upward, the stack pointer must be less than this address.
735 At present, the rtx may be either a REG or a SYMBOL_REF, although
736 the support provided depends on the backend. */
739 /* 0 if pointer arguments may alias each other. True in C.
740 1 if pointer arguments may not alias each other but may alias
742 2 if pointer arguments may not alias each other and may not
743 alias global variables. True in Fortran.
744 This defaults to 0 for C. */
745 int flag_argument_noalias = 0;
747 /* Nonzero if we should do (language-dependent) alias analysis.
748 Typically, this analysis will assume that expressions of certain
749 types do not alias expressions of certain other types. Only used
750 if alias analysis (in general) is enabled. */
751 int flag_strict_aliasing = 0;
753 /* Instrument functions with calls at entry and exit, for profiling. */
754 int flag_instrument_function_entry_exit = 0;
756 /* Nonzero means ignore `#ident' directives. 0 means handle them.
757 On SVR4 targets, it also controls whether or not to emit a
758 string identifying the compiler. */
760 int flag_no_ident = 0;
762 /* This will perform a peephole pass before sched2. */
763 int flag_peephole2 = 0;
765 /* This will try to guess branch probabilities. */
766 int flag_guess_branch_prob = 0;
768 /* -fcheck-bounds causes gcc to generate array bounds checks.
769 For C, C++, ObjC: defaults to off.
770 For Java: defaults to on.
771 For Fortran: defaults to off. */
772 int flag_bounds_check = 0;
774 /* This will attempt to merge constant section constants, if 1 only
775 string constants and constants from constant pool, if 2 also constant
777 int flag_merge_constants = 1;
779 /* If one, renumber instruction UIDs to reduce the number of
780 unused UIDs if there are a lot of instructions. If greater than
781 one, unconditionally renumber instruction UIDs. */
782 int flag_renumber_insns = 1;
784 /* If nonzero, use the graph coloring register allocator. */
785 int flag_new_regalloc = 0;
787 /* Nonzero if we perform superblock formation. */
791 /* Nonzero if we perform whole unit at a time compilation. */
793 int flag_unit_at_a_time = 0;
795 /* Nonzero if we should track variables. When
796 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
797 to optimize, debug_info_level and debug_hooks in process_options (). */
799 #define AUTODETECT_FLAG_VAR_TRACKING 2
800 int flag_var_tracking = AUTODETECT_FLAG_VAR_TRACKING;
802 /* Values of the -falign-* flags: how much to align labels in code.
803 0 means `use default', 1 means `don't align'.
804 For each variable, there is an _log variant which is the power
805 of two not less than the variable, for .align output. */
809 int align_loops_max_skip;
812 int align_jumps_max_skip;
814 int align_labels_log;
815 int align_labels_max_skip;
817 int align_functions_log;
819 /* Like align_functions_log above, but used by front-ends to force the
820 minimum function alignment. Zero means no alignment is forced. */
821 int force_align_functions_log;
825 const char *const string;
829 lang_independent_options;
831 /* Nonzero if signed arithmetic overflow should trap. */
834 /* Nonzero if signed arithmetic overflow should wrap around. */
837 /* Nonzero if subexpressions must be evaluated from left-to-right. */
838 int flag_evaluation_order = 0;
840 /* Add or remove a leading underscore from user symbols. */
841 int flag_leading_underscore = -1;
843 /* The version of the C++ ABI in use. The following values are
846 0: The version of the ABI believed most conformant with the
847 C++ ABI specification. This ABI may change as bugs are
848 discovered and fixed. Therefore, 0 will not necessarily
849 indicate the same ABI in different versions of G++.
851 1: The version of the ABI first used in G++ 3.2.
853 2: The version of the ABI first used in G++ 3.4.
855 Additional positive integers will be assigned as new versions of
856 the ABI become the default version of the ABI. */
858 int flag_abi_version = 2;
860 /* The user symbol prefix after having resolved same. */
861 const char *user_label_prefix;
863 static const param_info lang_independent_params[] = {
864 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
865 { OPTION, DEFAULT, HELP },
866 #include "params.def"
871 /* Table of language-independent -f options.
872 STRING is the option name. VARIABLE is the address of the variable.
873 ON_VALUE is the value to store in VARIABLE
874 if `-fSTRING' is seen as an option.
875 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
877 static const lang_independent_options f_options[] =
879 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
880 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
881 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
882 {"float-store", &flag_float_store, 1 },
883 {"defer-pop", &flag_defer_pop, 1 },
884 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
885 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
886 {"tracer", &flag_tracer, 1 },
887 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
888 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
889 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
890 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
891 {"thread-jumps", &flag_thread_jumps, 1 },
892 {"strength-reduce", &flag_strength_reduce, 1 },
893 {"unroll-loops", &flag_unroll_loops, 1 },
894 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
895 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
896 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
897 {"peel-loops", &flag_peel_loops, 1 },
898 {"unswitch-loops", &flag_unswitch_loops, 1 },
899 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
900 {"move-all-movables", &flag_move_all_movables, 1 },
901 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
902 {"peephole", &flag_no_peephole, 0 },
903 {"force-mem", &flag_force_mem, 1 },
904 {"force-addr", &flag_force_addr, 1 },
905 {"function-cse", &flag_no_function_cse, 0 },
906 {"inline-functions", &flag_inline_functions, 1 },
907 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
908 {"inline", &flag_no_inline, 0 },
909 {"keep-static-consts", &flag_keep_static_consts, 1 },
910 {"syntax-only", &flag_syntax_only, 1 },
911 {"shared-data", &flag_shared_data, 1 },
912 {"caller-saves", &flag_caller_saves, 1 },
913 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
914 {"reg-struct-return", &flag_pcc_struct_return, 0 },
915 {"delayed-branch", &flag_delayed_branch, 1 },
916 {"web", &flag_web, 1},
917 {"gcse", &flag_gcse, 1 },
918 {"gcse-lm", &flag_gcse_lm, 1 },
919 {"gcse-sm", &flag_gcse_sm, 1 },
920 {"gcse-las", &flag_gcse_las, 1 },
921 {"gcse-after-reload", &flag_gcse_after_reload, 1},
922 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
923 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
924 {"btr-bb-exclusive", &flag_btr_bb_exclusive, 1 },
925 {"loop-optimize", &flag_loop_optimize, 1 },
926 {"crossjumping", &flag_crossjumping, 1 },
927 {"if-conversion", &flag_if_conversion, 1 },
928 {"if-conversion2", &flag_if_conversion2, 1 },
929 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
930 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
931 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
932 {"schedule-insns", &flag_schedule_insns, 1 },
933 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
934 {"sched-interblock",&flag_schedule_interblock, 1 },
935 {"sched-spec",&flag_schedule_speculative, 1 },
936 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
937 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
938 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
939 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
940 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
941 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
942 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
943 {"pic", &flag_pic, 1 },
944 {"PIC", &flag_pic, 2 },
945 {"pie", &flag_pie, 1 },
946 {"PIE", &flag_pie, 2 },
947 {"exceptions", &flag_exceptions, 1 },
948 {"unwind-tables", &flag_unwind_tables, 1 },
949 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
950 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
951 {"profile-arcs", &profile_arc_flag, 1 },
952 {"profile-values", &flag_profile_values, 1 },
953 {"vpt", &flag_value_profile_transformations, 1 },
954 {"test-coverage", &flag_test_coverage, 1 },
955 {"branch-probabilities", &flag_branch_probabilities, 1 },
956 {"profile", &profile_flag, 1 },
957 {"reorder-blocks", &flag_reorder_blocks, 1 },
958 {"reorder-functions", &flag_reorder_functions, 1 },
959 {"rename-registers", &flag_rename_registers, 1 },
960 {"cprop-registers", &flag_cprop_registers, 1 },
961 {"common", &flag_no_common, 0 },
962 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
963 {"function-sections", &flag_function_sections, 1 },
964 {"data-sections", &flag_data_sections, 1 },
965 {"verbose-asm", &flag_verbose_asm, 1 },
966 {"regmove", &flag_regmove, 1 },
967 {"optimize-register-move", &flag_regmove, 1 },
968 {"pack-struct", &flag_pack_struct, 1 },
969 {"stack-check", &flag_stack_check, 1 },
970 {"argument-alias", &flag_argument_noalias, 0 },
971 {"argument-noalias", &flag_argument_noalias, 1 },
972 {"argument-noalias-global", &flag_argument_noalias, 2 },
973 {"strict-aliasing", &flag_strict_aliasing, 1 },
974 {"align-loops", &align_loops, 0 },
975 {"align-jumps", &align_jumps, 0 },
976 {"align-labels", &align_labels, 0 },
977 {"align-functions", &align_functions, 0 },
978 {"merge-constants", &flag_merge_constants, 1 },
979 {"merge-all-constants", &flag_merge_constants, 2 },
980 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
981 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
982 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
983 {"leading-underscore", &flag_leading_underscore, 1 },
984 {"ident", &flag_no_ident, 0 },
985 { "peephole2", &flag_peephole2, 1 },
986 {"finite-math-only", &flag_finite_math_only, 1 },
987 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
988 {"math-errno", &flag_errno_math, 1 },
989 {"trapping-math", &flag_trapping_math, 1 },
990 {"rounding-math", &flag_rounding_math, 1 },
991 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
992 {"signaling-nans", &flag_signaling_nans, 1 },
993 {"bounds-check", &flag_bounds_check, 1 },
994 {"single-precision-constant", &flag_single_precision_constant, 1 },
995 {"time-report", &time_report, 1 },
996 {"mem-report", &mem_report, 1 },
997 { "trapv", &flag_trapv, 1 },
998 { "wrapv", &flag_wrapv, 1 },
999 { "new-ra", &flag_new_regalloc, 1 },
1000 { "var-tracking", &flag_var_tracking, 1}
1003 /* Here is a table, controlled by the tm.h file, listing each -m switch
1004 and which bits in `target_switches' it should set or clear.
1005 If VALUE is positive, it is bits to set.
1006 If VALUE is negative, -VALUE is bits to clear.
1007 (The sign bit is not used so there is no confusion.) */
1011 const char *const name;
1013 const char *const description;
1015 target_switches[] = TARGET_SWITCHES;
1017 /* This table is similar, but allows the switch to have a value. */
1019 #ifdef TARGET_OPTIONS
1022 const char *const prefix;
1023 const char **const variable;
1024 const char *const description;
1025 const char *const value;
1027 target_options[] = TARGET_OPTIONS;
1030 /* Nonzero means warn about function definitions that default the return type
1031 or that use a null return and have a return-type other than void. */
1033 int warn_return_type;
1035 /* Output files for assembler code (real compiler output)
1036 and debugging dumps. */
1039 FILE *aux_info_file;
1040 FILE *dump_file = NULL;
1041 FILE *cgraph_dump_file = NULL;
1043 /* The current working directory of a translation. It's generally the
1044 directory from which compilation was initiated, but a preprocessed
1045 file may specify the original directory in which it was
1048 static const char *src_pwd;
1050 /* Initialize src_pwd with the given string, and return true. If it
1051 was already initialized, return false. As a special case, it may
1052 be called with a NULL argument to test whether src_pwd has NOT been
1056 set_src_pwd (const char *pwd)
1060 if (strcmp (src_pwd, pwd) == 0)
1066 src_pwd = xstrdup (pwd);
1070 /* Return the directory from which the translation unit was initiated,
1071 in case set_src_pwd() was not called before to assign it a
1078 src_pwd = getpwd ();
1083 /* Called when the start of a function definition is parsed,
1084 this function prints on stderr the name of the function. */
1086 announce_function (tree decl)
1090 if (rtl_dump_and_exit)
1091 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1093 verbatim (" %s", lang_hooks.decl_printable_name (decl, 2));
1095 pp_needs_newline (global_dc->printer) = true;
1096 diagnostic_set_last_function (global_dc);
1100 /* Set up a default flag_random_seed and local_tick, unless the user
1101 already specified one. */
1106 if (!flag_random_seed)
1108 unsigned HOST_WIDE_INT value;
1109 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1111 /* Get some more or less random data. */
1112 #ifdef HAVE_GETTIMEOFDAY
1116 gettimeofday (&tv, NULL);
1117 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1121 time_t now = time (NULL);
1123 if (now != (time_t)-1)
1124 local_tick = (unsigned) now;
1127 value = local_tick ^ getpid ();
1129 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1130 flag_random_seed = random_seed;
1132 else if (!local_tick)
1137 /* Decode the string P as an integral parameter.
1138 If the string is indeed an integer return its numeric value else
1139 issue an Invalid Option error for the option PNAME and return DEFVAL.
1140 If PNAME is zero just return DEFVAL, do not call error. */
1143 read_integral_parameter (const char *p, const char *pname, const int defval)
1145 const char *endp = p;
1149 if (ISDIGIT (*endp))
1158 error ("invalid option argument `%s'", pname);
1165 /* Return the logarithm of X, base 2, considering X unsigned,
1166 if X is a power of 2. Otherwise, returns -1.
1168 This should be used via the `exact_log2' macro. */
1171 exact_log2_wide (unsigned HOST_WIDE_INT x)
1174 /* Test for 0 or a power of 2. */
1175 if (x == 0 || x != (x & -x))
1177 while ((x >>= 1) != 0)
1182 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1183 If X is 0, return -1.
1185 This should be used via the floor_log2 macro. */
1188 floor_log2_wide (unsigned HOST_WIDE_INT x)
1197 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1198 into ICE messages, which is much more user friendly. In case the
1199 error printer crashes, reset the signal to prevent infinite recursion. */
1202 crash_signal (int signo)
1204 signal (signo, SIG_DFL);
1205 internal_error ("%s", strsignal (signo));
1208 /* Arrange to dump core on error. (The regular error message is still
1209 printed first, except in the case of abort().) */
1212 setup_core_dumping (void)
1215 signal (SIGABRT, SIG_DFL);
1217 #if defined(HAVE_SETRLIMIT)
1220 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1221 fatal_error ("getting core file size maximum limit: %m");
1222 rlim.rlim_cur = rlim.rlim_max;
1223 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1224 fatal_error ("setting core file size limit to maximum: %m");
1227 diagnostic_abort_on_error (global_dc);
1231 /* Strip off a legitimate source ending from the input string NAME of
1232 length LEN. Rather than having to know the names used by all of
1233 our front ends, we strip off an ending of a period followed by
1234 up to five characters. (Java uses ".class".) */
1237 strip_off_ending (char *name, int len)
1240 for (i = 2; i < 6 && len > i; i++)
1242 if (name[len - i] == '.')
1244 name[len - i] = '\0';
1250 /* Output a quoted string. */
1253 output_quoted_string (FILE *asm_file, const char *string)
1255 #ifdef OUTPUT_QUOTED_STRING
1256 OUTPUT_QUOTED_STRING (asm_file, string);
1260 putc ('\"', asm_file);
1261 while ((c = *string++) != 0)
1265 if (c == '\"' || c == '\\')
1266 putc ('\\', asm_file);
1270 fprintf (asm_file, "\\%03o", (unsigned char) c);
1272 putc ('\"', asm_file);
1276 /* Output a file name in the form wanted by System V. */
1279 output_file_directive (FILE *asm_file, const char *input_name)
1284 if (input_name == NULL)
1285 input_name = "<stdin>";
1287 len = strlen (input_name);
1288 na = input_name + len;
1290 /* NA gets INPUT_NAME sans directory names. */
1291 while (na > input_name)
1293 if (IS_DIR_SEPARATOR (na[-1]))
1298 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1299 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1301 fprintf (asm_file, "\t.file\t");
1302 output_quoted_string (asm_file, na);
1303 fputc ('\n', asm_file);
1307 /* Do any final processing required for the declarations in VEC, of
1308 which there are LEN. We write out inline functions and variables
1309 that have been deferred until this point, but which are required.
1310 Returns nonzero if anything was put out. */
1313 wrapup_global_declarations (tree *vec, int len)
1318 int output_something = 0;
1320 for (i = 0; i < len; i++)
1324 /* We're not deferring this any longer. Assignment is
1325 conditional to avoid needlessly dirtying PCH pages. */
1326 if (DECL_DEFER_OUTPUT (decl) != 0)
1327 DECL_DEFER_OUTPUT (decl) = 0;
1329 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1330 lang_hooks.finish_incomplete_decl (decl);
1333 /* Now emit any global variables or functions that we have been
1334 putting off. We need to loop in case one of the things emitted
1335 here references another one which comes earlier in the list. */
1339 for (i = 0; i < len; i++)
1343 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1346 /* Don't write out static consts, unless we still need them.
1348 We also keep static consts if not optimizing (for debugging),
1349 unless the user specified -fno-keep-static-consts.
1350 ??? They might be better written into the debug information.
1351 This is possible when using DWARF.
1353 A language processor that wants static constants to be always
1354 written out (even if it is not used) is responsible for
1355 calling rest_of_decl_compilation itself. E.g. the C front-end
1356 calls rest_of_decl_compilation from finish_decl.
1357 One motivation for this is that is conventional in some
1358 environments to write things like:
1359 static const char rcsid[] = "... version string ...";
1360 intending to force the string to be in the executable.
1362 A language processor that would prefer to have unneeded
1363 static constants "optimized away" would just defer writing
1364 them out until here. E.g. C++ does this, because static
1365 constants are often defined in header files.
1367 ??? A tempting alternative (for both C and C++) would be
1368 to force a constant to be written if and only if it is
1369 defined in a main file, as opposed to an include file. */
1371 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1375 if (flag_unit_at_a_time
1376 && cgraph_varpool_node (decl)->finalized)
1378 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1379 && (TREE_USED (decl)
1380 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1382 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1384 else if (DECL_COMDAT (decl))
1386 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1387 && (optimize || !flag_keep_static_consts
1388 || DECL_ARTIFICIAL (decl)))
1394 rest_of_decl_compilation (decl, NULL, 1, 1);
1398 if (TREE_CODE (decl) == FUNCTION_DECL
1399 && DECL_INITIAL (decl) != 0
1400 && DECL_STRUCT_FUNCTION (decl) != 0
1401 && DECL_STRUCT_FUNCTION (decl)->saved_for_inline
1402 && (flag_keep_inline_functions
1403 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1404 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1407 output_inline_function (decl);
1412 output_something = 1;
1416 return output_something;
1419 /* Issue appropriate warnings for the global declarations in VEC (of
1420 which there are LEN). Output debugging information for them. */
1423 check_global_declarations (tree *vec, int len)
1428 for (i = 0; i < len; i++)
1432 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1433 && ! TREE_ASM_WRITTEN (decl))
1434 /* Cancel the RTL for this decl so that, if debugging info
1435 output for global variables is still to come,
1436 this one will be omitted. */
1437 SET_DECL_RTL (decl, NULL_RTX);
1439 /* Warn about any function
1440 declared static but not defined.
1441 We don't warn about variables,
1442 because many programs have static variables
1443 that exist only to get some text into the object file. */
1444 if (TREE_CODE (decl) == FUNCTION_DECL
1445 && (warn_unused_function
1446 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1447 && DECL_INITIAL (decl) == 0
1448 && DECL_EXTERNAL (decl)
1449 && ! DECL_ARTIFICIAL (decl)
1450 && ! TREE_PUBLIC (decl))
1452 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1453 pedwarn ("%J'%F' used but never defined", decl, decl);
1455 warning ("%J'%F' declared `static' but never defined", decl, decl);
1456 /* This symbol is effectively an "extern" declaration now. */
1457 TREE_PUBLIC (decl) = 1;
1458 assemble_external (decl);
1461 /* Warn about static fns or vars defined but not used. */
1462 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1463 /* We don't warn about "static const" variables because the
1464 "rcs_id" idiom uses that construction. */
1465 || (warn_unused_variable
1466 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1467 && ! DECL_IN_SYSTEM_HEADER (decl)
1468 && ! TREE_USED (decl)
1469 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1470 to handle multiple external decls in different scopes. */
1471 && ! TREE_USED (DECL_NAME (decl))
1472 && ! DECL_EXTERNAL (decl)
1473 && ! TREE_PUBLIC (decl)
1474 /* A volatile variable might be used in some non-obvious way. */
1475 && ! TREE_THIS_VOLATILE (decl)
1476 /* Global register variables must be declared to reserve them. */
1477 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1478 /* Otherwise, ask the language. */
1479 && lang_hooks.decls.warn_unused_global (decl))
1480 warning ("%J'%D' defined but not used", decl, decl);
1482 /* Avoid confusing the debug information machinery when there are
1484 if (errorcount == 0 && sorrycount == 0)
1486 timevar_push (TV_SYMOUT);
1487 (*debug_hooks->global_decl) (decl);
1488 timevar_pop (TV_SYMOUT);
1493 /* Warn about a use of an identifier which was marked deprecated. */
1495 warn_deprecated_use (tree node)
1497 if (node == 0 || !warn_deprecated_decl)
1501 warning ("`%s' is deprecated (declared at %s:%d)",
1502 IDENTIFIER_POINTER (DECL_NAME (node)),
1503 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1504 else if (TYPE_P (node))
1506 const char *what = NULL;
1507 tree decl = TYPE_STUB_DECL (node);
1509 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1510 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1511 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1512 && DECL_NAME (TYPE_NAME (node)))
1513 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1518 warning ("`%s' is deprecated (declared at %s:%d)", what,
1519 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1521 warning ("`%s' is deprecated", what);
1524 warning ("type is deprecated (declared at %s:%d)",
1525 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1527 warning ("type is deprecated");
1531 /* Save the current INPUT_LOCATION on the top entry in the
1532 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1533 INPUT_LOCATION accordingly. */
1536 push_srcloc (const char *file, int line)
1538 struct file_stack *fs;
1540 fs = xmalloc (sizeof (struct file_stack));
1541 fs->location = input_location;
1542 fs->next = input_file_stack;
1543 input_filename = file;
1545 input_file_stack = fs;
1546 input_file_stack_tick++;
1549 /* Pop the top entry off the stack of presently open source files.
1550 Restore the INPUT_LOCATION from the new topmost entry on the
1556 struct file_stack *fs;
1558 fs = input_file_stack;
1559 input_location = fs->location;
1560 input_file_stack = fs->next;
1562 input_file_stack_tick++;
1565 /* Compile an entire translation unit. Write a file of assembly
1566 output and various debugging dumps. */
1571 /* Initialize yet another pass. */
1573 init_final (main_input_filename);
1574 coverage_init (aux_base_name);
1576 timevar_push (TV_PARSE);
1578 /* Call the parser, which parses the entire file (calling
1579 rest_of_compilation for each function). */
1580 lang_hooks.parse_file (set_yydebug);
1582 /* In case there were missing block closers,
1583 get us back to the global binding level. */
1584 lang_hooks.clear_binding_stack ();
1586 /* Compilation is now finished except for writing
1587 what's left of the symbol table output. */
1588 timevar_pop (TV_PARSE);
1590 if (flag_syntax_only)
1593 lang_hooks.decls.final_write_globals ();
1595 cgraph_varpool_assemble_pending_decls ();
1597 /* This must occur after the loop to output deferred functions.
1598 Else the coverage initializer would not be emitted if all the
1599 functions in this compilation unit were deferred. */
1602 /* Write out any pending weak symbol declarations. */
1606 /* Do dbx symbols. */
1607 timevar_push (TV_SYMOUT);
1609 #ifdef DWARF2_UNWIND_INFO
1610 if (dwarf2out_do_frame ())
1611 dwarf2out_frame_finish ();
1614 (*debug_hooks->finish) (main_input_filename);
1615 timevar_pop (TV_SYMOUT);
1617 /* Output some stuff at end of file if nec. */
1619 dw2_output_indirect_constants ();
1621 targetm.asm_out.file_end ();
1623 /* Attach a special .ident directive to the end of the file to identify
1624 the version of GCC which compiled this code. The format of the .ident
1625 string is patterned after the ones produced by native SVR4 compilers. */
1628 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1629 IDENT_ASM_OP, version_string);
1633 /* Display help for target options. */
1635 display_target_options (void)
1638 static bool displayed = false;
1640 /* Avoid double printing for --help --target-help. */
1646 if (ARRAY_SIZE (target_switches) > 1
1647 #ifdef TARGET_OPTIONS
1648 || ARRAY_SIZE (target_options) > 1
1656 printf (_("\nTarget specific options:\n"));
1658 for (i = ARRAY_SIZE (target_switches); i--;)
1660 const char *option = target_switches[i].name;
1661 const char *description = target_switches[i].description;
1663 if (option == NULL || *option == 0)
1665 else if (description == NULL)
1670 printf (_(" -m%-23s [undocumented]\n"), option);
1672 else if (*description != 0)
1673 doc += printf (" -m%-23s %s\n", option, _(description));
1676 #ifdef TARGET_OPTIONS
1677 for (i = ARRAY_SIZE (target_options); i--;)
1679 const char *option = target_options[i].prefix;
1680 const char *description = target_options[i].description;
1682 if (option == NULL || *option == 0)
1684 else if (description == NULL)
1689 printf (_(" -m%-23s [undocumented]\n"), option);
1691 else if (*description != 0)
1692 doc += printf (" -m%-23s %s\n", option, _(description));
1698 printf (_("\nThere are undocumented target specific options as well.\n"));
1700 printf (_(" They exist, but they are not documented.\n"));
1705 /* Parse a -d... command line switch. */
1708 decode_d_option (const char *arg)
1719 flag_print_asm_name = 1;
1722 flag_dump_rtl_in_asm = 1;
1723 flag_print_asm_name = 1;
1726 graph_dump_format = vcg;
1729 rtl_dump_and_exit = 1;
1734 case 'D': /* These are handled by the preprocessor. */
1738 setup_core_dumping();
1743 if (!enable_rtl_dump_file (c))
1744 warning ("unrecognized gcc debugging option: %c", c);
1749 /* Indexed by enum debug_info_type. */
1750 const char *const debug_type_names[] =
1752 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
1755 /* Decode -m switches. */
1756 /* Decode the switch -mNAME. */
1759 set_target_switch (const char *name)
1762 int valid_target_option = 0;
1764 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1765 if (!strcmp (target_switches[j].name, name))
1767 if (target_switches[j].value < 0)
1768 target_flags &= ~-target_switches[j].value;
1770 target_flags |= target_switches[j].value;
1773 if (target_switches[j].value < 0)
1774 target_flags_explicit |= -target_switches[j].value;
1776 target_flags_explicit |= target_switches[j].value;
1778 valid_target_option = 1;
1781 #ifdef TARGET_OPTIONS
1782 if (!valid_target_option)
1783 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1785 int len = strlen (target_options[j].prefix);
1786 if (target_options[j].value)
1788 if (!strcmp (target_options[j].prefix, name))
1790 *target_options[j].variable = target_options[j].value;
1791 valid_target_option = 1;
1796 if (!strncmp (target_options[j].prefix, name, len))
1798 *target_options[j].variable = name + len;
1799 valid_target_option = 1;
1805 if (!valid_target_option)
1806 error ("invalid option `%s'", name);
1809 /* Print version information to FILE.
1810 Each line begins with INDENT (for the case where FILE is the
1811 assembler output file). */
1814 print_version (FILE *file, const char *indent)
1817 #define __VERSION__ "[?]"
1821 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1823 "%s%s%s version %s (%s) compiled by CC.\n"
1825 , indent, *indent != 0 ? " " : "",
1826 lang_hooks.name, version_string, TARGET_NAME,
1827 indent, __VERSION__);
1828 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1829 indent, *indent != 0 ? " " : "",
1830 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1833 /* Print an option value and return the adjusted position in the line.
1834 ??? We don't handle error returns from fprintf (disk full); presumably
1835 other code will catch a disk full though. */
1838 print_single_switch (FILE *file, int pos, int max,
1839 const char *indent, const char *sep, const char *term,
1840 const char *type, const char *name)
1842 /* The ultrix fprintf returns 0 on success, so compute the result we want
1843 here since we need it for the following test. */
1844 int len = strlen (sep) + strlen (type) + strlen (name);
1849 fprintf (file, "%s", term);
1854 fprintf (file, "%s", indent);
1855 pos = strlen (indent);
1857 fprintf (file, "%s%s%s", sep, type, name);
1862 /* Print active target switches to FILE.
1863 POS is the current cursor position and MAX is the size of a "line".
1864 Each line begins with INDENT and ends with TERM.
1865 Each switch is separated from the next by SEP. */
1868 print_switch_values (FILE *file, int pos, int max,
1869 const char *indent, const char *sep, const char *term)
1874 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1875 that it can be printed below. This helps reproducibility. */
1878 /* Print the options as passed. */
1879 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1880 _("options passed: "), "");
1882 for (p = &save_argv[1]; *p != NULL; p++)
1886 if (strcmp (*p, "-o") == 0)
1892 if (strcmp (*p, "-quiet") == 0)
1894 if (strcmp (*p, "-version") == 0)
1899 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1902 fprintf (file, "%s", term);
1904 /* Print the -f and -m options that have been enabled.
1905 We don't handle language specific options but printing argv
1908 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1909 _("options enabled: "), "");
1911 for (j = 0; j < ARRAY_SIZE (f_options); j++)
1912 if (*f_options[j].variable == f_options[j].on_value)
1913 pos = print_single_switch (file, pos, max, indent, sep, term,
1914 "-f", f_options[j].string);
1916 /* Print target specific options. */
1918 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1919 if (target_switches[j].name[0] != '\0'
1920 && target_switches[j].value > 0
1921 && ((target_switches[j].value & target_flags)
1922 == target_switches[j].value))
1924 pos = print_single_switch (file, pos, max, indent, sep, term,
1925 "-m", target_switches[j].name);
1928 #ifdef TARGET_OPTIONS
1929 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1930 if (*target_options[j].variable != NULL)
1933 sprintf (prefix, "-m%s", target_options[j].prefix);
1934 pos = print_single_switch (file, pos, max, indent, sep, term,
1935 prefix, *target_options[j].variable);
1939 fprintf (file, "%s", term);
1942 /* Open assembly code output file. Do this even if -fsyntax-only is
1943 on, because then the driver will have provided the name of a
1944 temporary file or bit bucket for us. NAME is the file specified on
1945 the command line, possibly NULL. */
1947 init_asm_output (const char *name)
1949 if (name == NULL && asm_file_name == 0)
1950 asm_out_file = stdout;
1953 if (asm_file_name == 0)
1955 int len = strlen (dump_base_name);
1956 char *dumpname = xmalloc (len + 6);
1957 memcpy (dumpname, dump_base_name, len + 1);
1958 strip_off_ending (dumpname, len);
1959 strcat (dumpname, ".s");
1960 asm_file_name = dumpname;
1962 if (!strcmp (asm_file_name, "-"))
1963 asm_out_file = stdout;
1965 asm_out_file = fopen (asm_file_name, "w+");
1966 if (asm_out_file == 0)
1967 fatal_error ("can't open %s for writing: %m", asm_file_name);
1970 #ifdef IO_BUFFER_SIZE
1971 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
1972 _IOFBF, IO_BUFFER_SIZE);
1975 if (!flag_syntax_only)
1977 targetm.asm_out.file_start ();
1979 #ifdef ASM_COMMENT_START
1980 if (flag_verbose_asm)
1982 /* Print the list of options in effect. */
1983 print_version (asm_out_file, ASM_COMMENT_START);
1984 print_switch_values (asm_out_file, 0, MAX_LINE,
1985 ASM_COMMENT_START, " ", "\n");
1986 /* Add a blank line here so it appears in assembler output but not
1988 fprintf (asm_out_file, "\n");
1994 /* Default version of get_pch_validity.
1995 By default, every flag difference is fatal; that will be mostly right for
1996 most targets, but completely right for very few. */
1999 default_get_pch_validity (size_t *len)
2001 #ifdef TARGET_OPTIONS
2006 *len = sizeof (target_flags) + 2;
2007 #ifdef TARGET_OPTIONS
2008 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2011 if (*target_options[i].variable)
2012 *len += strlen (*target_options[i].variable);
2016 result = r = xmalloc (*len);
2020 memcpy (r, &target_flags, sizeof (target_flags));
2021 r += sizeof (target_flags);
2023 #ifdef TARGET_OPTIONS
2024 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2026 const char *str = *target_options[i].variable;
2030 l = strlen (str) + 1;
2039 /* Default version of pch_valid_p. */
2042 default_pch_valid_p (const void *data_p, size_t len)
2044 const char *data = (const char *)data_p;
2045 const char *flag_that_differs = NULL;
2048 /* -fpic and -fpie also usually make a PCH invalid. */
2049 if (data[0] != flag_pic)
2050 return _("created and used with different settings of -fpic");
2051 if (data[1] != flag_pie)
2052 return _("created and used with different settings of -fpie");
2055 /* Check target_flags. */
2056 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
2058 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
2063 memcpy (&tf, data, sizeof (target_flags));
2065 bits = target_switches[i].value;
2068 if ((target_flags & bits) != (tf & bits))
2070 flag_that_differs = target_switches[i].name;
2076 data += sizeof (target_flags);
2077 len -= sizeof (target_flags);
2079 /* Check string options. */
2080 #ifdef TARGET_OPTIONS
2081 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2083 const char *str = *target_options[i].variable;
2087 l = strlen (str) + 1;
2088 if (len < l || memcmp (data, str, l) != 0)
2090 flag_that_differs = target_options[i].prefix;
2103 asprintf (&r, _("created and used with differing settings of `-m%s'"),
2106 return _("out of memory");
2111 /* Default tree printer. Handles declarations only. */
2113 default_tree_printer (pretty_printer * pp, text_info *text)
2115 switch (*text->format_spec)
2121 tree t = va_arg (*text->args_ptr, tree);
2122 const char *n = DECL_NAME (t)
2123 ? lang_hooks.decl_printable_name (t, 2)
2134 /* Initialization of the front end environment, before command line
2135 options are parsed. Signal handlers, internationalization etc.
2136 ARGV0 is main's argv[0]. */
2138 general_init (const char *argv0)
2142 p = argv0 + strlen (argv0);
2143 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
2147 xmalloc_set_program_name (progname);
2151 gcc_init_libintl ();
2153 /* Initialize the diagnostics reporting machinery, so option parsing
2154 can give warnings and errors. */
2155 diagnostic_initialize (global_dc);
2156 /* Set a default printer. Language specific initializations will
2157 override it later. */
2158 pp_format_decoder (global_dc->printer) = &default_tree_printer;
2160 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
2162 signal (SIGSEGV, crash_signal);
2165 signal (SIGILL, crash_signal);
2168 signal (SIGBUS, crash_signal);
2171 signal (SIGABRT, crash_signal);
2173 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
2174 signal (SIGIOT, crash_signal);
2177 signal (SIGFPE, crash_signal);
2180 /* Other host-specific signal setup. */
2181 (*host_hooks.extra_signals)();
2183 /* Initialize the garbage-collector, string pools and tree type hash
2187 linemap_init (&line_table);
2190 /* Initialize register usage now so switches may override. */
2193 /* Register the language-independent parameters. */
2194 add_params (lang_independent_params, LAST_PARAM);
2196 /* This must be done after add_params but before argument processing. */
2197 init_ggc_heuristics();
2200 /* Process the options that have been parsed. */
2202 process_options (void)
2204 /* Allow the front end to perform consistency checks and do further
2205 initialization based on the command line options. This hook also
2206 sets the original filename if appropriate (e.g. foo.i -> foo.c)
2207 so we can correctly initialize debug output. */
2208 no_backend = lang_hooks.post_options (&main_input_filename);
2209 input_filename = main_input_filename;
2211 #ifdef OVERRIDE_OPTIONS
2212 /* Some machines may reject certain combinations of options. */
2216 /* Set aux_base_name if not already set. */
2219 else if (main_input_filename)
2221 char *name = xstrdup (lbasename (main_input_filename));
2223 strip_off_ending (name, strlen (name));
2224 aux_base_name = name;
2227 aux_base_name = "gccaux";
2229 /* Set up the align_*_log variables, defaulting them to 1 if they
2230 were still unset. */
2231 if (align_loops <= 0) align_loops = 1;
2232 if (align_loops_max_skip > align_loops || !align_loops)
2233 align_loops_max_skip = align_loops - 1;
2234 align_loops_log = floor_log2 (align_loops * 2 - 1);
2235 if (align_jumps <= 0) align_jumps = 1;
2236 if (align_jumps_max_skip > align_jumps || !align_jumps)
2237 align_jumps_max_skip = align_jumps - 1;
2238 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
2239 if (align_labels <= 0) align_labels = 1;
2240 align_labels_log = floor_log2 (align_labels * 2 - 1);
2241 if (align_labels_max_skip > align_labels || !align_labels)
2242 align_labels_max_skip = align_labels - 1;
2243 if (align_functions <= 0) align_functions = 1;
2244 align_functions_log = floor_log2 (align_functions * 2 - 1);
2246 /* Unrolling all loops implies that standard loop unrolling must also
2248 if (flag_unroll_all_loops)
2249 flag_unroll_loops = 1;
2251 if (flag_unroll_loops)
2253 flag_old_unroll_loops = 0;
2254 flag_old_unroll_all_loops = 0;
2257 if (flag_old_unroll_all_loops)
2258 flag_old_unroll_loops = 1;
2260 /* Old loop unrolling requires that strength_reduction be on also. Silently
2261 turn on strength reduction here if it isn't already on. Also, the loop
2262 unrolling code assumes that cse will be run after loop, so that must
2263 be turned on also. */
2264 if (flag_old_unroll_loops)
2266 flag_strength_reduce = 1;
2267 flag_rerun_cse_after_loop = 1;
2269 if (flag_unroll_loops || flag_peel_loops)
2270 flag_rerun_cse_after_loop = 1;
2272 if (flag_non_call_exceptions)
2273 flag_asynchronous_unwind_tables = 1;
2274 if (flag_asynchronous_unwind_tables)
2275 flag_unwind_tables = 1;
2277 /* Disable unit-at-a-time mode for frontends not supporting callgraph
2279 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
2280 flag_unit_at_a_time = 0;
2282 if (flag_value_profile_transformations)
2283 flag_profile_values = 1;
2285 /* Warn about options that are not supported on this machine. */
2286 #ifndef INSN_SCHEDULING
2287 if (flag_schedule_insns || flag_schedule_insns_after_reload)
2288 warning ("instruction scheduling not supported on this target machine");
2291 if (flag_delayed_branch)
2292 warning ("this target machine does not have delayed branches");
2295 user_label_prefix = USER_LABEL_PREFIX;
2296 if (flag_leading_underscore != -1)
2298 /* If the default prefix is more complicated than "" or "_",
2299 issue a warning and ignore this option. */
2300 if (user_label_prefix[0] == 0 ||
2301 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
2303 user_label_prefix = flag_leading_underscore ? "_" : "";
2306 warning ("-f%sleading-underscore not supported on this target machine",
2307 flag_leading_underscore ? "" : "no-");
2310 /* If we are in verbose mode, write out the version and maybe all the
2311 option flags in use. */
2314 print_version (stderr, "");
2316 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
2319 if (flag_syntax_only)
2321 write_symbols = NO_DEBUG;
2325 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
2327 if (debug_info_level == DINFO_LEVEL_NONE)
2328 write_symbols = NO_DEBUG;
2330 /* Now we know write_symbols, set up the debug hooks based on it.
2331 By default we do nothing for debug output. */
2332 if (write_symbols == NO_DEBUG)
2333 debug_hooks = &do_nothing_debug_hooks;
2334 #if defined(DBX_DEBUGGING_INFO)
2335 else if (write_symbols == DBX_DEBUG)
2336 debug_hooks = &dbx_debug_hooks;
2338 #if defined(XCOFF_DEBUGGING_INFO)
2339 else if (write_symbols == XCOFF_DEBUG)
2340 debug_hooks = &xcoff_debug_hooks;
2342 #ifdef SDB_DEBUGGING_INFO
2343 else if (write_symbols == SDB_DEBUG)
2344 debug_hooks = &sdb_debug_hooks;
2346 #ifdef DWARF2_DEBUGGING_INFO
2347 else if (write_symbols == DWARF2_DEBUG)
2348 debug_hooks = &dwarf2_debug_hooks;
2350 #ifdef VMS_DEBUGGING_INFO
2351 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
2352 debug_hooks = &vmsdbg_debug_hooks;
2355 error ("target system does not support the \"%s\" debug format",
2356 debug_type_names[write_symbols]);
2358 /* Now we know which debug output will be used so we can set
2359 flag_var_tracking if user has not specified it. */
2360 if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING)
2362 /* User has not specified -f(no-)var-tracking so autodetect it. */
2364 = (optimize >= 1 && debug_info_level >= DINFO_LEVEL_NORMAL
2365 && debug_hooks->var_location != do_nothing_debug_hooks.var_location);
2368 /* If auxiliary info generation is desired, open the output file.
2369 This goes in the same directory as the source file--unlike
2370 all the other output files. */
2371 if (flag_gen_aux_info)
2373 aux_info_file = fopen (aux_info_file_name, "w");
2374 if (aux_info_file == 0)
2375 fatal_error ("can't open %s: %m", aux_info_file_name);
2378 if (! targetm.have_named_sections)
2380 if (flag_function_sections)
2382 warning ("-ffunction-sections not supported for this target");
2383 flag_function_sections = 0;
2385 if (flag_data_sections)
2387 warning ("-fdata-sections not supported for this target");
2388 flag_data_sections = 0;
2392 if (flag_function_sections && profile_flag)
2394 warning ("-ffunction-sections disabled; it makes profiling impossible");
2395 flag_function_sections = 0;
2398 #ifndef HAVE_prefetch
2399 if (flag_prefetch_loop_arrays)
2401 warning ("-fprefetch-loop-arrays not supported for this target");
2402 flag_prefetch_loop_arrays = 0;
2405 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
2407 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
2408 flag_prefetch_loop_arrays = 0;
2412 /* This combination of options isn't handled for i386 targets and doesn't
2413 make much sense anyway, so don't allow it. */
2414 if (flag_prefetch_loop_arrays && optimize_size)
2416 warning ("-fprefetch-loop-arrays is not supported with -Os");
2417 flag_prefetch_loop_arrays = 0;
2420 #ifndef OBJECT_FORMAT_ELF
2421 if (flag_function_sections && write_symbols != NO_DEBUG)
2422 warning ("-ffunction-sections may affect debugging on some targets");
2425 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2426 if (flag_signaling_nans)
2427 flag_trapping_math = 1;
2430 /* Initialize the compiler back end. */
2434 init_adjust_machine_modes ();
2436 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2437 || debug_info_level == DINFO_LEVEL_VERBOSE
2438 #ifdef VMS_DEBUGGING_INFO
2439 /* Enable line number info for traceback. */
2440 || debug_info_level > DINFO_LEVEL_NONE
2442 || flag_test_coverage
2443 || warn_notreached);
2446 init_fake_stack_mems ();
2450 init_function_once ();
2451 init_varasm_once ();
2453 /* The following initialization functions need to generate rtl, so
2454 provide a dummy function context for them. */
2455 init_dummy_function_start ();
2457 if (flag_caller_saves)
2458 init_caller_save ();
2459 expand_dummy_function_end ();
2462 /* Language-dependent initialization. Returns nonzero on success. */
2464 lang_dependent_init (const char *name)
2466 if (dump_base_name == 0)
2467 dump_base_name = name ? name : "gccdump";
2469 /* Other front-end initialization. */
2470 if (lang_hooks.init () == 0)
2473 init_asm_output (name);
2475 /* These create various _DECL nodes, so need to be called after the
2476 front end is initialized. */
2479 init_optimization_passes ();
2481 /* The following initialization functions need to generate rtl, so
2482 provide a dummy function context for them. */
2483 init_dummy_function_start ();
2485 expand_dummy_function_end ();
2487 /* If dbx symbol table desired, initialize writing it and output the
2488 predefined types. */
2489 timevar_push (TV_SYMOUT);
2491 #ifdef DWARF2_UNWIND_INFO
2492 if (dwarf2out_do_frame ())
2493 dwarf2out_frame_init ();
2496 /* Now we have the correct original filename, we can initialize
2498 (*debug_hooks->init) (name);
2500 timevar_pop (TV_SYMOUT);
2505 /* Clean up: close opened files, etc. */
2510 /* Close the dump files. */
2511 if (flag_gen_aux_info)
2513 fclose (aux_info_file);
2515 unlink (aux_info_file_name);
2518 /* Close non-debugging input and output files. Take special care to note
2519 whether fclose returns an error, since the pages might still be on the
2520 buffer chain while the file is open. */
2524 if (ferror (asm_out_file) != 0)
2525 fatal_error ("error writing to %s: %m", asm_file_name);
2526 if (fclose (asm_out_file) != 0)
2527 fatal_error ("error closing %s: %m", asm_file_name);
2530 finish_optimization_passes ();
2534 ggc_print_statistics ();
2535 stringpool_statistics ();
2536 dump_tree_statistics ();
2537 dump_rtx_statistics ();
2538 dump_varray_statistics ();
2539 dump_alloc_pool_statistics ();
2540 dump_ggc_loc_statistics ();
2543 /* Free up memory for the benefit of leak detectors. */
2546 /* Language-specific end of compilation actions. */
2547 lang_hooks.finish ();
2550 /* Initialize the compiler, and compile the input file. */
2554 /* Initialize timing first. The C front ends read the main file in
2555 the post_options hook, and C++ does file timings. */
2556 if (time_report || !quiet_flag || flag_detailed_statistics)
2558 timevar_start (TV_TOTAL);
2562 /* Don't do any more if an error has already occurred. */
2565 /* Set up the back-end if requested. */
2569 /* Language-dependent initialization. Returns true on success. */
2570 if (lang_dependent_init (main_input_filename))
2576 /* Stop timing and print the times. */
2577 timevar_stop (TV_TOTAL);
2578 timevar_print (stderr);
2581 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2582 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2583 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2585 It is not safe to call this function more than once. */
2588 toplev_main (unsigned int argc, const char **argv)
2592 /* Initialization of GCC's environment, and diagnostics. */
2593 general_init (argv[0]);
2595 /* Parse the options and do minimal processing; basically just
2596 enough to default flags appropriately. */
2597 decode_options (argc, argv);
2601 /* Exit early if we can (e.g. -help). */
2602 if (!exit_after_options)
2605 if (errorcount || sorrycount)
2606 return (FATAL_EXIT_CODE);
2608 return (SUCCESS_EXIT_CODE);