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 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. */
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
46 #include "insn-attr.h"
47 #include "insn-config.h"
48 #include "insn-flags.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
71 #include "langhooks.h"
73 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
74 #include "dwarf2out.h"
77 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
81 #ifdef SDB_DEBUGGING_INFO
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
94 /* Carry information from ASM_DECLARE_OBJECT_NAME
95 to ASM_FINISH_DECLARE_OBJECT. */
97 extern int size_directive_output;
98 extern tree last_assemble_variable_decl;
100 static void general_init PARAMS ((char *));
101 static void parse_options_and_default_flags PARAMS ((int, char **));
102 static void do_compile PARAMS ((void));
103 static void process_options PARAMS ((void));
104 static void lang_independent_init PARAMS ((void));
105 static int lang_dependent_init PARAMS ((const char *));
106 static void init_asm_output PARAMS ((const char *));
107 static void finalize PARAMS ((void));
109 static void set_target_switch PARAMS ((const char *));
111 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
112 static void compile_file PARAMS ((void));
113 static void display_help PARAMS ((void));
114 static void display_target_options PARAMS ((void));
116 static void decode_d_option PARAMS ((const char *));
117 static int decode_f_option PARAMS ((const char *));
118 static int decode_W_option PARAMS ((const char *));
119 static int decode_g_option PARAMS ((const char *));
120 static unsigned int independent_decode_option PARAMS ((int, char **));
122 static void print_version PARAMS ((FILE *, const char *));
123 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
124 const char *, const char *,
125 const char *, const char *));
126 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
127 const char *, const char *));
129 /* Length of line when printing switch values. */
132 /* Name of program invoked, sans directories. */
134 const char *progname;
136 /* Copy of arguments to toplev_main. */
140 /* Name of current original source file (what was input to cpp).
141 This comes from each #-command in the actual input. */
143 const char *input_filename;
145 /* Name of top-level original source file (what was input to cpp).
146 This comes from the #-command at the beginning of the actual input.
147 If there isn't any there, then this is the cc1 input file name. */
149 const char *main_input_filename;
151 /* Current line number in real source file. */
155 /* Nonzero if it is unsafe to create any new pseudo registers. */
158 /* Stack of currently pending input files. */
160 struct file_stack *input_file_stack;
162 /* Incremented on each change to input_file_stack. */
163 int input_file_stack_tick;
165 /* Name to use as base of names for dump output files. */
167 const char *dump_base_name;
169 /* Format to use to print dumpfile index value */
170 #ifndef DUMPFILE_FORMAT
171 #define DUMPFILE_FORMAT ".%02d."
174 /* Bit flags that specify the machine subtype we are compiling for.
175 Bits are tested using macros TARGET_... defined in the tm.h file
176 and set by `-m...' switches. Must be defined in rtlanal.c. */
178 extern int target_flags;
180 /* Debug hooks - dependent upon command line options. */
182 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
184 /* Describes a dump file. */
186 struct dump_file_info
188 /* The unique extension to apply, e.g. ".jump". */
189 const char *const extension;
191 /* The -d<c> character that enables this dump file. */
192 char const debug_switch;
194 /* True if there is a corresponding graph dump file. */
195 char const graph_dump_p;
197 /* True if the user selected this dump. */
200 /* True if the files have been initialized (ie truncated). */
204 /* Enumerate the extant dump files. */
244 /* Describes all the dump files. Should be kept in order of the
245 pass and in sync with dump_file_index above.
247 Remaining -d letters:
253 static struct dump_file_info dump_file[DFI_MAX] =
255 { "rtl", 'r', 0, 0, 0 },
256 { "sibling", 'i', 0, 0, 0 },
257 { "eh", 'h', 0, 0, 0 },
258 { "jump", 'j', 0, 0, 0 },
259 { "ssa", 'e', 1, 0, 0 },
260 { "ssaccp", 'W', 1, 0, 0 },
261 { "ssadce", 'X', 1, 0, 0 },
262 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
263 { "null", 'u', 0, 0, 0 },
264 { "cse", 's', 0, 0, 0 },
265 { "addressof", 'F', 0, 0, 0 },
266 { "gcse", 'G', 1, 0, 0 },
267 { "loop", 'L', 1, 0, 0 },
268 { "cfg", 'f', 1, 0, 0 },
269 { "bp", 'b', 1, 0, 0 },
270 { "cse2", 't', 1, 0, 0 },
271 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
272 { "combine", 'c', 1, 0, 0 },
273 { "ce", 'C', 1, 0, 0 },
274 { "regmove", 'N', 1, 0, 0 },
275 { "sched", 'S', 1, 0, 0 },
276 { "lreg", 'l', 1, 0, 0 },
277 { "greg", 'g', 1, 0, 0 },
278 { "postreload", 'o', 1, 0, 0 },
279 { "flow2", 'w', 1, 0, 0 },
280 { "peephole2", 'z', 1, 0, 0 },
281 { "rnreg", 'n', 1, 0, 0 },
282 { "ce2", 'E', 1, 0, 0 },
283 { "sched2", 'R', 1, 0, 0 },
284 { "stack", 'k', 1, 0, 0 },
285 { "bbro", 'B', 1, 0, 0 },
286 { "mach", 'M', 1, 0, 0 },
287 { "dbr", 'd', 0, 0, 0 },
290 static int open_dump_file PARAMS ((enum dump_file_index, tree));
291 static void close_dump_file PARAMS ((enum dump_file_index,
292 void (*) (FILE *, rtx), rtx));
294 /* Other flags saying which kinds of debugging dump have been requested. */
296 int rtl_dump_and_exit;
297 int flag_print_asm_name;
298 static int version_flag;
299 static char *filename;
300 enum graph_dump_types graph_dump_format;
302 /* Name for output file of assembly code, specified with -o. */
306 /* Value of the -G xx switch, and whether it was passed or not. */
310 /* Type(s) of debugging information we are producing (if any).
311 See flags.h for the definitions of the different possible
312 types of debugging information. */
313 enum debug_info_type write_symbols = NO_DEBUG;
315 /* Level of debugging information we are producing. See flags.h
316 for the definitions of the different possible levels. */
317 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
319 /* Nonzero means use GNU-only extensions in the generated symbolic
320 debugging information. */
321 /* Currently, this only has an effect when write_symbols is set to
322 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
323 int use_gnu_debug_info_extensions = 0;
325 /* Nonzero means do optimizations. -O.
326 Particular numeric values stand for particular amounts of optimization;
327 thus, -O2 stores 2 here. However, the optimizations beyond the basic
328 ones are not controlled directly by this variable. Instead, they are
329 controlled by individual `flag_...' variables that are defaulted
330 based on this variable. */
334 /* Nonzero means optimize for size. -Os.
335 The only valid values are zero and non-zero. When optimize_size is
336 non-zero, optimize defaults to 2, but certain individual code
337 bloating optimizations are disabled. */
339 int optimize_size = 0;
341 /* Nonzero if we should exit after parsing options. */
342 static int exit_after_options = 0;
344 /* The FUNCTION_DECL for the function currently being compiled,
345 or 0 if between functions. */
346 tree current_function_decl;
348 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
350 tree current_function_func_begin_label;
352 /* Nonzero if doing dwarf2 duplicate elimination. */
354 int flag_eliminate_dwarf2_dups = 0;
356 /* Nonzero if generating code to do profiling. */
358 int profile_flag = 0;
360 /* Nonzero if generating code to profile program flow graph arcs. */
362 int profile_arc_flag = 0;
364 /* Nonzero if generating info for gcov to calculate line test coverage. */
366 int flag_test_coverage = 0;
368 /* Nonzero indicates that branch taken probabilities should be calculated. */
370 int flag_branch_probabilities = 0;
372 /* Nonzero if basic blocks should be reordered. */
374 int flag_reorder_blocks = 0;
376 /* Nonzero if registers should be renamed. */
378 int flag_rename_registers = 0;
379 int flag_cprop_registers = 0;
381 /* Nonzero for -pedantic switch: warn about anything
382 that standard spec forbids. */
386 /* Temporarily suppress certain warnings.
387 This is set while reading code from a system header file. */
389 int in_system_header = 0;
391 /* Don't print functions as they are compiled. -quiet. */
395 /* Print times taken by the various passes. -ftime-report. */
399 /* Print memory still in use at end of compilation (which may have little
400 to do with peak memory consumption). -fmem-report. */
404 /* Non-zero means to collect statistics which might be expensive
405 and to print them when we are done. */
406 int flag_detailed_statistics = 0;
411 /* Nonzero means `char' should be signed. */
413 int flag_signed_char;
415 /* Nonzero means give an enum type only as many bytes as it needs. */
417 int flag_short_enums;
419 /* Nonzero for -fcaller-saves: allocate values in regs that need to
420 be saved across function calls, if that produces overall better code.
421 Optional now, so people can test it. */
423 #ifdef DEFAULT_CALLER_SAVES
424 int flag_caller_saves = 1;
426 int flag_caller_saves = 0;
429 /* Nonzero if structures and unions should be returned in memory.
431 This should only be defined if compatibility with another compiler or
432 with an ABI is needed, because it results in slower code. */
434 #ifndef DEFAULT_PCC_STRUCT_RETURN
435 #define DEFAULT_PCC_STRUCT_RETURN 1
438 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
440 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
442 /* Nonzero for -fforce-mem: load memory value into a register
443 before arithmetic on it. This makes better cse but slower compilation. */
445 int flag_force_mem = 0;
447 /* Nonzero for -fforce-addr: load memory address into a register before
448 reference to memory. This makes better cse but slower compilation. */
450 int flag_force_addr = 0;
452 /* Nonzero for -fdefer-pop: don't pop args after each function call;
453 instead save them up to pop many calls' args with one insns. */
455 int flag_defer_pop = 0;
457 /* Nonzero for -ffloat-store: don't allocate floats and doubles
458 in extended-precision registers. */
460 int flag_float_store = 0;
462 /* Nonzero for -fcse-follow-jumps:
463 have cse follow jumps to do a more extensive job. */
465 int flag_cse_follow_jumps;
467 /* Nonzero for -fcse-skip-blocks:
468 have cse follow a branch around a block. */
469 int flag_cse_skip_blocks;
471 /* Nonzero for -fexpensive-optimizations:
472 perform miscellaneous relatively-expensive optimizations. */
473 int flag_expensive_optimizations;
475 /* Nonzero for -fthread-jumps:
476 have jump optimize output of loop. */
478 int flag_thread_jumps;
480 /* Nonzero enables strength-reduction in loop.c. */
482 int flag_strength_reduce = 0;
484 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
485 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
486 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
489 int flag_unroll_loops;
491 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
492 This is generally not a win. */
494 int flag_unroll_all_loops;
496 /* Nonzero enables prefetch optimizations for arrays in loops. */
498 int flag_prefetch_loop_arrays;
500 /* Nonzero forces all invariant computations in loops to be moved
503 int flag_move_all_movables = 0;
505 /* Nonzero forces all general induction variables in loops to be
508 int flag_reduce_all_givs = 0;
510 /* Nonzero to perform full register move optimization passes. This is the
513 int flag_regmove = 0;
515 /* Nonzero for -fwritable-strings:
516 store string constants in data segment and don't uniquize them. */
518 int flag_writable_strings = 0;
520 /* Nonzero means don't put addresses of constant functions in registers.
521 Used for compiling the Unix kernel, where strange substitutions are
522 done on the assembly output. */
524 int flag_no_function_cse = 0;
526 /* Nonzero for -fomit-frame-pointer:
527 don't make a frame pointer in simple functions that don't require one. */
529 int flag_omit_frame_pointer = 0;
531 /* Nonzero means place each function into its own section on those platforms
532 which support arbitrary section names and unlimited numbers of sections. */
534 int flag_function_sections = 0;
536 /* ... and similar for data. */
538 int flag_data_sections = 0;
540 /* Nonzero to inhibit use of define_optimization peephole opts. */
542 int flag_no_peephole = 0;
544 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
546 int flag_optimize_sibling_calls = 0;
548 /* Nonzero means the front end generally wants `errno' maintained by math
549 operations, like built-in SQRT. */
551 int flag_errno_math = 1;
553 /* Nonzero means that unsafe floating-point math optimizations are allowed
554 for the sake of speed. IEEE compliance is not guaranteed, and operations
555 are allowed to assume that their arguments and results are "normal"
556 (e.g., nonnegative for SQRT). */
558 int flag_unsafe_math_optimizations = 0;
560 /* Zero means that floating-point math operations cannot generate a
561 (user-visible) trap. This is the case, for example, in nonstop
562 IEEE 754 arithmetic. */
564 int flag_trapping_math = 1;
566 /* 0 means straightforward implementation of complex divide acceptable.
567 1 means wide ranges of inputs must work for complex divide.
568 2 means C99-like requirements for complex divide (not yet implemented). */
570 int flag_complex_divide_method = 0;
572 /* Nonzero means all references through pointers are volatile. */
576 /* Nonzero means treat all global and extern variables as volatile. */
578 int flag_volatile_global;
580 /* Nonzero means treat all static variables as volatile. */
582 int flag_volatile_static;
584 /* Nonzero means just do syntax checking; don't output anything. */
586 int flag_syntax_only = 0;
588 /* Nonzero means perform global cse. */
590 static int flag_gcse;
592 /* Nonzero means perform loop optimizer. */
594 static int flag_loop_optimize;
596 /* Nonzero means perform crossjumping. */
598 static int flag_crossjumping;
600 /* Nonzero means to use global dataflow analysis to eliminate
601 useless null pointer tests. */
603 static int flag_delete_null_pointer_checks;
605 /* Nonzero means to do the enhanced load motion during gcse, which trys
606 to hoist loads by not killing them when a store to the same location
609 int flag_gcse_lm = 1;
611 /* Nonzero means to perform store motion after gcse, which will try to
612 move stores closer to the exit block. Its not very effective without
615 int flag_gcse_sm = 1;
617 /* Nonzero means to rerun cse after loop optimization. This increases
618 compilation time about 20% and picks up a few more common expressions. */
620 static int flag_rerun_cse_after_loop;
622 /* Nonzero means to run loop optimizations twice. */
624 int flag_rerun_loop_opt;
626 /* Nonzero for -finline-functions: ok to inline functions that look like
627 good inline candidates. */
629 int flag_inline_functions;
631 /* Nonzero for -fkeep-inline-functions: even if we make a function
632 go inline everywhere, keep its definition around for debugging
635 int flag_keep_inline_functions;
637 /* Nonzero means that functions will not be inlined. */
639 int flag_no_inline = 2;
641 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
642 not just because the tree inliner turned us off. */
644 int flag_really_no_inline = 2;
646 /* Nonzero means that we should emit static const variables
647 regardless of whether or not optimization is turned on. */
649 int flag_keep_static_consts = 1;
651 /* Nonzero means we should be saving declaration info into a .X file. */
653 int flag_gen_aux_info = 0;
655 /* Specified name of aux-info file. */
657 static char *aux_info_file_name;
659 /* Nonzero means make the text shared if supported. */
661 int flag_shared_data;
663 /* Nonzero means schedule into delayed branch slots if supported. */
665 int flag_delayed_branch;
667 /* Nonzero if we are compiling pure (sharable) code.
668 Value is 1 if we are doing reasonable (i.e. simple
669 offset into offset table) pic. Value is 2 if we can
670 only perform register offsets. */
674 /* Nonzero means generate extra code for exception handling and enable
675 exception handling. */
679 /* Nonzero means generate frame unwind info table when supported. */
681 int flag_unwind_tables = 0;
683 /* Nonzero means generate frame unwind info table exact at each insn boundary */
685 int flag_asynchronous_unwind_tables = 0;
687 /* Nonzero means don't place uninitialized global data in common storage
692 /* Nonzero means change certain warnings into errors.
693 Usually these are warnings about failure to conform to some standard. */
695 int flag_pedantic_errors = 0;
697 /* flag_schedule_insns means schedule insns within basic blocks (before
699 flag_schedule_insns_after_reload means schedule insns after
702 int flag_schedule_insns = 0;
703 int flag_schedule_insns_after_reload = 0;
705 /* The following flags have effect only for scheduling before register
708 flag_schedule_interblock means schedule insns accross basic blocks.
709 flag_schedule_speculative means allow speculative motion of non-load insns.
710 flag_schedule_speculative_load means allow speculative motion of some
712 flag_schedule_speculative_load_dangerous allows speculative motion of more
715 int flag_schedule_interblock = 1;
716 int flag_schedule_speculative = 1;
717 int flag_schedule_speculative_load = 0;
718 int flag_schedule_speculative_load_dangerous = 0;
720 int flag_single_precision_constant;
722 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
723 by a cheaper branch on a count register. */
724 int flag_branch_on_count_reg = 1;
726 /* -finhibit-size-directive inhibits output of .size for ELF.
727 This is used only for compiling crtstuff.c,
728 and it may be extended to other effects
729 needed for crtstuff.c on other systems. */
730 int flag_inhibit_size_directive = 0;
732 /* -fverbose-asm causes extra commentary information to be produced in
733 the generated assembly code (to make it more readable). This option
734 is generally only of use to those who actually need to read the
735 generated assembly code (perhaps while debugging the compiler itself).
736 -fno-verbose-asm, the default, causes the extra information
737 to be omitted and is useful when comparing two assembler files. */
739 int flag_verbose_asm = 0;
741 /* -dA causes debug commentary information to be produced in
742 the generated assembly code (to make it more readable). This option
743 is generally only of use to those who actually need to read the
744 generated assembly code (perhaps while debugging the compiler itself).
745 Currently, this switch is only used by dwarfout.c; however, it is intended
746 to be a catchall for printing debug information in the assembler file. */
748 int flag_debug_asm = 0;
750 /* -dP causes the rtl to be emitted as a comment in assembly. */
752 int flag_dump_rtl_in_asm = 0;
754 /* -fgnu-linker specifies use of the GNU linker for initializations.
755 (Or, more generally, a linker that handles initializations.)
756 -fno-gnu-linker says that collect2 will be used. */
758 int flag_gnu_linker = 0;
760 int flag_gnu_linker = 1;
763 /* Nonzero means put zero initialized data in the bss section. */
764 int flag_zero_initialized_in_bss = 1;
769 /* Enable ssa conditional constant propagation. */
770 int flag_ssa_ccp = 0;
772 /* Enable ssa aggressive dead code elimination. */
773 int flag_ssa_dce = 0;
775 /* Tag all structures with __attribute__(packed). */
776 int flag_pack_struct = 0;
778 /* Emit code to check for stack overflow; also may cause large objects
779 to be allocated dynamically. */
780 int flag_stack_check;
782 /* When non-NULL, indicates that whenever space is allocated on the
783 stack, the resulting stack pointer must not pass this
784 address---that is, for stacks that grow downward, the stack pointer
785 must always be greater than or equal to this address; for stacks
786 that grow upward, the stack pointer must be less than this address.
787 At present, the rtx may be either a REG or a SYMBOL_REF, although
788 the support provided depends on the backend. */
791 /* 0 if pointer arguments may alias each other. True in C.
792 1 if pointer arguments may not alias each other but may alias
794 2 if pointer arguments may not alias each other and may not
795 alias global variables. True in Fortran.
796 This defaults to 0 for C. */
797 int flag_argument_noalias = 0;
799 /* Nonzero if we should do (language-dependent) alias analysis.
800 Typically, this analysis will assume that expressions of certain
801 types do not alias expressions of certain other types. Only used
802 if alias analysis (in general) is enabled. */
803 int flag_strict_aliasing = 0;
805 /* Instrument functions with calls at entry and exit, for profiling. */
806 int flag_instrument_function_entry_exit = 0;
808 /* Nonzero means ignore `#ident' directives. 0 means handle them.
809 On SVR4 targets, it also controls whether or not to emit a
810 string identifying the compiler. */
812 int flag_no_ident = 0;
814 /* This will perform a peephole pass before sched2. */
815 int flag_peephole2 = 0;
817 /* This will try to guess branch probabilities. */
818 int flag_guess_branch_prob = 0;
820 /* -fbounded-pointers causes gcc to compile pointers as composite
821 objects occupying three words: the pointer value, the base address
822 of the referent object, and the address immediately beyond the end
823 of the referent object. The base and extent allow us to perform
824 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
825 int flag_bounded_pointers = 0;
827 /* -fcheck-bounds causes gcc to generate array bounds checks.
828 For C, C++: defaults to value of flag_bounded_pointers.
829 For ObjC: defaults to off.
830 For Java: defaults to on.
831 For Fortran: defaults to off.
832 For CHILL: defaults to off. */
833 int flag_bounds_check = 0;
835 /* This will attempt to merge constant section constants, if 1 only
836 string constants and constants from constant pool, if 2 also constant
838 int flag_merge_constants = 1;
840 /* If one, renumber instruction UIDs to reduce the number of
841 unused UIDs if there are a lot of instructions. If greater than
842 one, unconditionally renumber instruction UIDs. */
843 int flag_renumber_insns = 1;
845 /* Values of the -falign-* flags: how much to align labels in code.
846 0 means `use default', 1 means `don't align'.
847 For each variable, there is an _log variant which is the power
848 of two not less than the variable, for .align output. */
852 int align_loops_max_skip;
855 int align_jumps_max_skip;
857 int align_labels_log;
858 int align_labels_max_skip;
860 int align_functions_log;
862 /* Table of supported debugging formats. */
865 const char *const arg;
866 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
867 constant expression, we use NO_DEBUG in its place. */
868 const enum debug_info_type debug_type;
869 const int use_extensions_p;
870 const char *const description;
874 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
875 N_("Generate debugging info in default format") },
876 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
877 #ifdef DBX_DEBUGGING_INFO
878 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
879 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
881 #ifdef DWARF_DEBUGGING_INFO
882 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
883 { "dwarf+", DWARF_DEBUG, 1,
884 N_("Generate extended DWARF-1 format debug info") },
886 #ifdef DWARF2_DEBUGGING_INFO
887 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
889 #ifdef XCOFF_DEBUGGING_INFO
890 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
891 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
893 #ifdef SDB_DEBUGGING_INFO
894 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
896 #ifdef VMS_DEBUGGING_INFO
897 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
904 const char *const string;
907 const char *const description;
909 lang_independent_options;
913 /* Add or remove a leading underscore from user symbols. */
914 int flag_leading_underscore = -1;
916 /* The user symbol prefix after having resolved same. */
917 const char *user_label_prefix;
919 static const param_info lang_independent_params[] = {
920 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
921 { OPTION, DEFAULT, HELP },
922 #include "params.def"
927 /* A default for same. */
928 #ifndef USER_LABEL_PREFIX
929 #define USER_LABEL_PREFIX ""
932 /* Table of language-independent -f options.
933 STRING is the option name. VARIABLE is the address of the variable.
934 ON_VALUE is the value to store in VARIABLE
935 if `-fSTRING' is seen as an option.
936 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
938 static const lang_independent_options f_options[] =
940 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
941 N_("Perform DWARF2 duplicate elimination") },
942 {"float-store", &flag_float_store, 1,
943 N_("Do not store floats in registers") },
944 {"volatile", &flag_volatile, 1,
945 N_("Consider all mem refs through pointers as volatile") },
946 {"volatile-global", &flag_volatile_global, 1,
947 N_("Consider all mem refs to global data to be volatile") },
948 {"volatile-static", &flag_volatile_static, 1,
949 N_("Consider all mem refs to static data to be volatile") },
950 {"defer-pop", &flag_defer_pop, 1,
951 N_("Defer popping functions args from stack until later") },
952 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
953 N_("When possible do not generate stack frames") },
954 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
955 N_("Optimize sibling and tail recursive calls") },
956 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
957 N_("When running CSE, follow jumps to their targets") },
958 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
959 N_("When running CSE, follow conditional jumps") },
960 {"expensive-optimizations", &flag_expensive_optimizations, 1,
961 N_("Perform a number of minor, expensive optimizations") },
962 {"thread-jumps", &flag_thread_jumps, 1,
963 N_("Perform jump threading optimizations") },
964 {"strength-reduce", &flag_strength_reduce, 1,
965 N_("Perform strength reduction optimizations") },
966 {"unroll-loops", &flag_unroll_loops, 1,
967 N_("Perform loop unrolling when iteration count is known") },
968 {"unroll-all-loops", &flag_unroll_all_loops, 1,
969 N_("Perform loop unrolling for all loops") },
970 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
971 N_("Generate prefetch instructions, if available, for arrays in loops") },
972 {"move-all-movables", &flag_move_all_movables, 1,
973 N_("Force all loop invariant computations out of loops") },
974 {"reduce-all-givs", &flag_reduce_all_givs, 1,
975 N_("Strength reduce all loop general induction variables") },
976 {"writable-strings", &flag_writable_strings, 1,
977 N_("Store strings in writable data section") },
978 {"peephole", &flag_no_peephole, 0,
979 N_("Enable machine specific peephole optimizations") },
980 {"force-mem", &flag_force_mem, 1,
981 N_("Copy memory operands into registers before using") },
982 {"force-addr", &flag_force_addr, 1,
983 N_("Copy memory address constants into regs before using") },
984 {"function-cse", &flag_no_function_cse, 0,
985 N_("Allow function addresses to be held in registers") },
986 {"inline-functions", &flag_inline_functions, 1,
987 N_("Integrate simple functions into their callers") },
988 {"keep-inline-functions", &flag_keep_inline_functions, 1,
989 N_("Generate code for funcs even if they are fully inlined") },
990 {"inline", &flag_no_inline, 0,
991 N_("Pay attention to the 'inline' keyword") },
992 {"keep-static-consts", &flag_keep_static_consts, 1,
993 N_("Emit static const variables even if they are not used") },
994 {"syntax-only", &flag_syntax_only, 1,
995 N_("Check for syntax errors, then stop") },
996 {"shared-data", &flag_shared_data, 1,
997 N_("Mark data as shared rather than private") },
998 {"caller-saves", &flag_caller_saves, 1,
999 N_("Enable saving registers around function calls") },
1000 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1001 N_("Return 'short' aggregates in memory, not registers") },
1002 {"reg-struct-return", &flag_pcc_struct_return, 0,
1003 N_("Return 'short' aggregates in registers") },
1004 {"delayed-branch", &flag_delayed_branch, 1,
1005 N_("Attempt to fill delay slots of branch instructions") },
1006 {"gcse", &flag_gcse, 1,
1007 N_("Perform the global common subexpression elimination") },
1008 {"gcse-lm", &flag_gcse_lm, 1,
1009 N_("Perform enhanced load motion during global subexpression elimination") },
1010 {"gcse-sm", &flag_gcse_sm, 1,
1011 N_("Perform store motion after global subexpression elimination") },
1012 {"loop-optimize", &flag_loop_optimize, 1,
1013 N_("Perform the loop optimizations") },
1014 {"crossjumping", &flag_crossjumping, 1,
1015 N_("Perform cross-jumping optimization") },
1016 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1017 N_("Run CSE pass after loop optimizations") },
1018 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1019 N_("Run the loop optimizer twice") },
1020 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1021 N_("Delete useless null pointer checks") },
1022 {"schedule-insns", &flag_schedule_insns, 1,
1023 N_("Reschedule instructions before register allocation") },
1024 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1025 N_("Reschedule instructions after register allocation") },
1026 {"sched-interblock",&flag_schedule_interblock, 1,
1027 N_("Enable scheduling across basic blocks") },
1028 {"sched-spec",&flag_schedule_speculative, 1,
1029 N_("Allow speculative motion of non-loads") },
1030 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1031 N_("Allow speculative motion of some loads") },
1032 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1033 N_("Allow speculative motion of more loads") },
1034 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1035 N_("Replace add,compare,branch with branch on count reg") },
1036 {"pic", &flag_pic, 1,
1037 N_("Generate position independent code, if possible") },
1038 {"PIC", &flag_pic, 2, ""},
1039 {"exceptions", &flag_exceptions, 1,
1040 N_("Enable exception handling") },
1041 {"unwind-tables", &flag_unwind_tables, 1,
1042 N_("Just generate unwind tables for exception handling") },
1043 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1044 N_("Generate unwind tables exact at each instruction boundary") },
1045 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1046 N_("Support synchronous non-call exceptions") },
1047 {"profile-arcs", &profile_arc_flag, 1,
1048 N_("Insert arc based program profiling code") },
1049 {"test-coverage", &flag_test_coverage, 1,
1050 N_("Create data files needed by gcov") },
1051 {"branch-probabilities", &flag_branch_probabilities, 1,
1052 N_("Use profiling information for branch probabilities") },
1053 {"reorder-blocks", &flag_reorder_blocks, 1,
1054 N_("Reorder basic blocks to improve code placement") },
1055 {"rename-registers", &flag_rename_registers, 1,
1056 N_("Do the register renaming optimization pass") },
1057 {"cprop-registers", &flag_cprop_registers, 1,
1058 N_("Do the register copy-propagation optimization pass") },
1059 {"common", &flag_no_common, 0,
1060 N_("Do not put uninitialized globals in the common section") },
1061 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1062 N_("Do not generate .size directives") },
1063 {"function-sections", &flag_function_sections, 1,
1064 N_("place each function into its own section") },
1065 {"data-sections", &flag_data_sections, 1,
1066 N_("place data items into their own section") },
1067 {"verbose-asm", &flag_verbose_asm, 1,
1068 N_("Add extra commentry to assembler output") },
1069 {"gnu-linker", &flag_gnu_linker, 1,
1070 N_("Output GNU ld formatted global initializers") },
1071 {"regmove", &flag_regmove, 1,
1072 N_("Enables a register move optimization") },
1073 {"optimize-register-move", &flag_regmove, 1,
1074 N_("Do the full regmove optimization pass") },
1075 {"pack-struct", &flag_pack_struct, 1,
1076 N_("Pack structure members together without holes") },
1077 {"stack-check", &flag_stack_check, 1,
1078 N_("Insert stack checking code into the program") },
1079 {"argument-alias", &flag_argument_noalias, 0,
1080 N_("Specify that arguments may alias each other & globals") },
1081 {"argument-noalias", &flag_argument_noalias, 1,
1082 N_("Assume arguments may alias globals but not each other") },
1083 {"argument-noalias-global", &flag_argument_noalias, 2,
1084 N_("Assume arguments do not alias each other or globals") },
1085 {"strict-aliasing", &flag_strict_aliasing, 1,
1086 N_("Assume strict aliasing rules apply") },
1087 {"align-loops", &align_loops, 0,
1088 N_("Align the start of loops") },
1089 {"align-jumps", &align_jumps, 0,
1090 N_("Align labels which are only reached by jumping") },
1091 {"align-labels", &align_labels, 0,
1092 N_("Align all labels") },
1093 {"align-functions", &align_functions, 0,
1094 N_("Align the start of functions") },
1095 {"merge-constants", &flag_merge_constants, 1,
1096 N_("Attempt to merge identical constants accross compilation units") },
1097 {"merge-all-constants", &flag_merge_constants, 2,
1098 N_("Attempt to merge identical constants and constant variables") },
1099 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1100 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1101 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1102 N_("Instrument function entry/exit with profiling calls") },
1103 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1104 N_("Put zero initialized data in the bss section") },
1105 {"ssa", &flag_ssa, 1,
1106 N_("Enable SSA optimizations") },
1107 {"ssa-ccp", &flag_ssa_ccp, 1,
1108 N_("Enable SSA conditional constant propagation") },
1109 {"ssa-dce", &flag_ssa_dce, 1,
1110 N_("Enable aggressive SSA dead code elimination") },
1111 {"leading-underscore", &flag_leading_underscore, 1,
1112 N_("External symbols have a leading underscore") },
1113 {"ident", &flag_no_ident, 0,
1114 N_("Process #ident directives") },
1115 { "peephole2", &flag_peephole2, 1,
1116 N_("Enables an rtl peephole pass run before sched2") },
1117 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1118 N_("Enables guessing of branch probabilities") },
1119 {"math-errno", &flag_errno_math, 1,
1120 N_("Set errno after built-in math functions") },
1121 {"trapping-math", &flag_trapping_math, 1,
1122 N_("Floating-point operations can trap") },
1123 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1124 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1125 {"bounded-pointers", &flag_bounded_pointers, 1,
1126 N_("Compile pointers as triples: value, base & end") },
1127 {"bounds-check", &flag_bounds_check, 1,
1128 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1129 {"single-precision-constant", &flag_single_precision_constant, 1,
1130 N_("Convert floating point constant to single precision constant") },
1131 {"time-report", &time_report, 1,
1132 N_("Report time taken by each compiler pass at end of run") },
1133 {"mem-report", &mem_report, 1,
1134 N_("Report on permanent memory allocation at end of run") },
1135 { "trapv", &flag_trapv, 1,
1136 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1139 /* Table of language-specific options. */
1141 static const struct lang_opt
1143 const char *const option;
1144 const char *const description;
1146 documented_lang_options[] =
1148 /* In order not to overload the --help output, the convention
1149 used here is to only describe those options which are not
1150 enabled by default. */
1153 N_("Compile just for ISO C89") },
1155 N_("Determine language standard") },
1157 { "-fsigned-bitfields", "" },
1158 { "-funsigned-bitfields",
1159 N_("Make bit-fields by unsigned by default") },
1160 { "-fno-signed-bitfields", "" },
1161 { "-fno-unsigned-bitfields","" },
1163 N_("Make 'char' be signed by default") },
1164 { "-funsigned-char",
1165 N_("Make 'char' be unsigned by default") },
1166 { "-fno-signed-char", "" },
1167 { "-fno-unsigned-char", "" },
1171 N_("Do not recognize the 'asm' keyword") },
1172 { "-fbuiltin", "" },
1174 N_("Do not recognize any built in functions") },
1176 N_("Assume normal C execution environment") },
1177 { "-fno-hosted", "" },
1179 N_("Assume that standard libraries & main might not exist") },
1180 { "-fno-freestanding", "" },
1181 { "-fcond-mismatch",
1182 N_("Allow different types as args of ? operator") },
1183 { "-fno-cond-mismatch", "" },
1184 { "-fdollars-in-identifiers",
1185 N_("Allow the use of $ inside identifiers") },
1186 { "-fno-dollars-in-identifiers", "" },
1187 { "-fpreprocessed", "" },
1188 { "-fno-preprocessed", "" },
1190 N_("Use the same size for double as for float") },
1191 { "-fno-short-double", "" },
1193 N_("Use the smallest fitting integer to hold enums") },
1194 { "-fno-short-enums", "" },
1196 N_("Override the underlying type for wchar_t to `unsigned short'") },
1197 { "-fno-short-wchar", "" },
1200 N_("Enable most warning messages") },
1201 { "-Wbad-function-cast",
1202 N_("Warn about casting functions to incompatible types") },
1203 { "-Wno-bad-function-cast", "" },
1204 { "-Wmissing-format-attribute",
1205 N_("Warn about functions which might be candidates for format attributes") },
1206 { "-Wno-missing-format-attribute", "" },
1208 N_("Warn about casts which discard qualifiers") },
1209 { "-Wno-cast-qual", "" },
1210 { "-Wchar-subscripts",
1211 N_("Warn about subscripts whose type is 'char'") },
1212 { "-Wno-char-subscripts", "" },
1214 N_("Warn if nested comments are detected") },
1215 { "-Wno-comment", "" },
1217 N_("Warn if nested comments are detected") },
1218 { "-Wno-comments", "" },
1220 N_("Warn about possibly confusing type conversions") },
1221 { "-Wno-conversion", "" },
1222 { "-Wdiv-by-zero", "" },
1223 { "-Wno-div-by-zero",
1224 N_("Do not warn about compile-time integer division by zero") },
1226 N_("Warn about testing equality of floating point numbers") },
1227 { "-Wno-float-equal", "" },
1229 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1230 { "-Wno-format", "" },
1231 { "-Wformat-extra-args", "" },
1232 { "-Wno-format-extra-args",
1233 N_("Don't warn about too many arguments to format functions") },
1234 { "-Wformat-nonliteral",
1235 N_("Warn about non-string-literal format strings") },
1236 { "-Wno-format-nonliteral", "" },
1237 { "-Wformat-security",
1238 N_("Warn about possible security problems with format functions") },
1239 { "-Wno-format-security", "" },
1240 { "-Wformat-y2k", "" },
1241 { "-Wno-format-y2k",
1242 N_("Don't warn about strftime formats yielding 2 digit years") },
1243 { "-Wimplicit-function-declaration",
1244 N_("Warn about implicit function declarations") },
1245 { "-Wno-implicit-function-declaration", "" },
1246 { "-Werror-implicit-function-declaration", "" },
1248 N_("Warn when a declaration does not specify a type") },
1249 { "-Wno-implicit-int", "" },
1250 { "-Wimplicit", "" },
1251 { "-Wno-implicit", "" },
1253 N_("Warn about the use of the #import directive") },
1254 { "-Wno-import", "" },
1255 { "-Wlong-long","" },
1257 N_("Do not warn about using 'long long' when -pedantic") },
1259 N_("Warn about suspicious declarations of main") },
1260 { "-Wno-main", "" },
1261 { "-Wmissing-braces",
1262 N_("Warn about possibly missing braces around initializers") },
1263 { "-Wno-missing-braces", "" },
1264 { "-Wmissing-declarations",
1265 N_("Warn about global funcs without previous declarations") },
1266 { "-Wno-missing-declarations", "" },
1267 { "-Wmissing-prototypes",
1268 N_("Warn about global funcs without prototypes") },
1269 { "-Wno-missing-prototypes", "" },
1271 N_("Warn about use of multicharacter literals") },
1272 { "-Wno-multichar", "" },
1273 { "-Wnested-externs",
1274 N_("Warn about externs not at file scope level") },
1275 { "-Wno-nested-externs", "" },
1277 N_("Warn about possible missing parentheses") },
1278 { "-Wno-parentheses", "" },
1279 { "-Wpointer-arith",
1280 N_("Warn about function pointer arithmetic") },
1281 { "-Wno-pointer-arith", "" },
1282 { "-Wredundant-decls",
1283 N_("Warn about multiple declarations of the same object") },
1284 { "-Wno-redundant-decls", "" },
1286 N_("Warn whenever a function's return-type defaults to int") },
1287 { "-Wno-return-type", "" },
1288 { "-Wsequence-point",
1289 N_("Warn about possible violations of sequence point rules") },
1290 { "-Wno-sequence-point", "" },
1292 N_("Warn about signed/unsigned comparisons") },
1293 { "-Wno-sign-compare", "" },
1294 { "-Wstrict-prototypes",
1295 N_("Warn about non-prototyped function decls") },
1296 { "-Wno-strict-prototypes", "" },
1298 N_("Warn about constructs whose meanings change in ISO C") },
1299 { "-Wno-traditional", "" },
1301 N_("Warn when trigraphs are encountered") },
1302 { "-Wno-trigraphs", "" },
1304 { "-Wno-undef", "" },
1305 { "-Wunknown-pragmas",
1306 N_("Warn about unrecognized pragmas") },
1307 { "-Wno-unknown-pragmas", "" },
1308 { "-Wwrite-strings",
1309 N_("Mark strings as 'const char *'") },
1310 { "-Wno-write-strings", "" },
1312 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1314 #include "options.h"
1318 /* Here is a table, controlled by the tm.h file, listing each -m switch
1319 and which bits in `target_switches' it should set or clear.
1320 If VALUE is positive, it is bits to set.
1321 If VALUE is negative, -VALUE is bits to clear.
1322 (The sign bit is not used so there is no confusion.) */
1326 const char *const name;
1328 const char *const description;
1330 target_switches [] = TARGET_SWITCHES;
1332 /* This table is similar, but allows the switch to have a value. */
1334 #ifdef TARGET_OPTIONS
1337 const char *const prefix;
1338 const char **const variable;
1339 const char *const description;
1341 target_options [] = TARGET_OPTIONS;
1344 /* Options controlling warnings. */
1346 /* Don't print warning messages. -w. */
1348 int inhibit_warnings = 0;
1350 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1352 int warn_system_headers = 0;
1354 /* Print various extra warnings. -W. */
1356 int extra_warnings = 0;
1358 /* Treat warnings as errors. -Werror. */
1360 int warnings_are_errors = 0;
1362 /* Nonzero to warn about unused variables, functions et.al. */
1364 int warn_unused_function;
1365 int warn_unused_label;
1366 int warn_unused_parameter;
1367 int warn_unused_variable;
1368 int warn_unused_value;
1370 /* Nonzero to warn about code which is never reached. */
1372 int warn_notreached;
1374 /* Nonzero to warn about variables used before they are initialized. */
1376 int warn_uninitialized;
1378 /* Nonzero means warn about all declarations which shadow others. */
1382 /* Warn if a switch on an enum, that does not have a default case,
1383 fails to have a case for every enum value. */
1387 /* Warn if a switch does not have a default case. */
1389 int warn_switch_default;
1391 /* Warn if a switch on an enum fails to have a case for every enum
1392 value (regardless of the presence or otherwise of a default case). */
1394 int warn_switch_enum;
1396 /* Nonzero means warn about function definitions that default the return type
1397 or that use a null return and have a return-type other than void. */
1399 int warn_return_type;
1401 /* Nonzero means warn about pointer casts that increase the required
1402 alignment of the target type (and might therefore lead to a crash
1403 due to a misaligned access). */
1405 int warn_cast_align;
1407 /* Nonzero means warn about any objects definitions whose size is larger
1408 than N bytes. Also want about function definitions whose returned
1409 values are larger than N bytes. The value N is in `larger_than_size'. */
1411 int warn_larger_than;
1412 HOST_WIDE_INT larger_than_size;
1414 /* Nonzero means warn if inline function is too large. */
1418 /* Warn if a function returns an aggregate,
1419 since there are often incompatible calling conventions for doing this. */
1421 int warn_aggregate_return;
1423 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1427 /* Warn when gcc pads a structure to an alignment boundary. */
1431 /* Warn when an optimization pass is disabled. */
1433 int warn_disabled_optimization;
1435 /* Warn about functions which might be candidates for attribute noreturn. */
1437 int warn_missing_noreturn;
1439 /* Nonzero means warn about uses of __attribute__((deprecated))
1442 int warn_deprecated_decl = 1;
1444 /* Likewise for -W. */
1446 static const lang_independent_options W_options[] =
1448 {"unused-function", &warn_unused_function, 1,
1449 N_("Warn when a function is unused") },
1450 {"unused-label", &warn_unused_label, 1,
1451 N_("Warn when a label is unused") },
1452 {"unused-parameter", &warn_unused_parameter, 1,
1453 N_("Warn when a function parameter is unused") },
1454 {"unused-variable", &warn_unused_variable, 1,
1455 N_("Warn when a variable is unused") },
1456 {"unused-value", &warn_unused_value, 1,
1457 N_("Warn when an expression value is unused") },
1458 {"system-headers", &warn_system_headers, 1,
1459 N_("Do not suppress warnings from system headers") },
1460 {"error", &warnings_are_errors, 1,
1461 N_("Treat all warnings as errors") },
1462 {"shadow", &warn_shadow, 1,
1463 N_("Warn when one local variable shadows another") },
1464 {"switch", &warn_switch, 1,
1465 N_("Warn about enumerated switches, with no default, missing a case") },
1466 {"switch-default", &warn_switch_default, 1,
1467 N_("Warn about enumerated switches missing a default case") },
1468 {"switch-enum", &warn_switch_enum, 1,
1469 N_("Warn about all enumerated switches missing a specific case") },
1470 {"aggregate-return", &warn_aggregate_return, 1,
1471 N_("Warn about returning structures, unions or arrays") },
1472 {"cast-align", &warn_cast_align, 1,
1473 N_("Warn about pointer casts which increase alignment") },
1474 {"unreachable-code", &warn_notreached, 1,
1475 N_("Warn about code that will never be executed") },
1476 {"uninitialized", &warn_uninitialized, 1,
1477 N_("Warn about uninitialized automatic variables") },
1478 {"inline", &warn_inline, 1,
1479 N_("Warn when an inlined function cannot be inlined") },
1480 {"packed", &warn_packed, 1,
1481 N_("Warn when the packed attribute has no effect on struct layout") },
1482 {"padded", &warn_padded, 1,
1483 N_("Warn when padding is required to align struct members") },
1484 {"disabled-optimization", &warn_disabled_optimization, 1,
1485 N_("Warn when an optimization pass is disabled") },
1486 {"deprecated-declarations", &warn_deprecated_decl, 1,
1487 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1488 {"missing-noreturn", &warn_missing_noreturn, 1,
1489 N_("Warn about functions which might be candidates for attribute noreturn") }
1493 set_Wunused (setting)
1496 warn_unused_function = setting;
1497 warn_unused_label = setting;
1498 /* Unused function parameter warnings are reported when either ``-W
1499 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1500 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1502 warn_unused_parameter = 0;
1503 else if (!warn_unused_parameter)
1504 warn_unused_parameter = -1;
1505 warn_unused_variable = setting;
1506 warn_unused_value = setting;
1509 /* The following routines are useful in setting all the flags that
1510 -ffast-math and -fno-fast-math imply. */
1513 set_fast_math_flags ()
1515 flag_trapping_math = 0;
1516 flag_unsafe_math_optimizations = 1;
1517 flag_errno_math = 0;
1521 set_no_fast_math_flags ()
1523 flag_trapping_math = 1;
1524 flag_unsafe_math_optimizations = 0;
1525 flag_errno_math = 1;
1529 /* Output files for assembler code (real compiler output)
1530 and debugging dumps. */
1533 FILE *aux_info_file;
1534 FILE *rtl_dump_file = NULL;
1536 /* Decode the string P as an integral parameter.
1537 If the string is indeed an integer return its numeric value else
1538 issue an Invalid Option error for the option PNAME and return DEFVAL.
1539 If PNAME is zero just return DEFVAL, do not call error. */
1542 read_integral_parameter (p, pname, defval)
1547 const char *endp = p;
1551 if (ISDIGIT (*endp))
1560 error ("invalid option `%s'", pname);
1567 /* This calls abort and is used to avoid problems when abort if a macro.
1568 It is used when we need to pass the address of abort. */
1576 /* When `malloc.c' is compiled with `rcheck' defined,
1577 it calls this function to report clobberage. */
1581 const char *s ATTRIBUTE_UNUSED;
1586 /* Return the logarithm of X, base 2, considering X unsigned,
1587 if X is a power of 2. Otherwise, returns -1.
1589 This should be used via the `exact_log2' macro. */
1593 unsigned HOST_WIDE_INT x;
1596 /* Test for 0 or a power of 2. */
1597 if (x == 0 || x != (x & -x))
1599 while ((x >>= 1) != 0)
1604 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1605 If X is 0, return -1.
1607 This should be used via the floor_log2 macro. */
1611 unsigned HOST_WIDE_INT x;
1620 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1621 into ICE messages, which is much more user friendly. */
1624 crash_signal (signo)
1627 internal_error ("internal error: %s", strsignal (signo));
1630 /* Strip off a legitimate source ending from the input string NAME of
1631 length LEN. Rather than having to know the names used by all of
1632 our front ends, we strip off an ending of a period followed by
1633 up to five characters. (Java uses ".class".) */
1636 strip_off_ending (name, len)
1641 for (i = 2; i < 6 && len > i; i++)
1643 if (name[len - i] == '.')
1645 name[len - i] = '\0';
1651 /* Output a quoted string. */
1654 output_quoted_string (asm_file, string)
1658 #ifdef OUTPUT_QUOTED_STRING
1659 OUTPUT_QUOTED_STRING (asm_file, string);
1663 putc ('\"', asm_file);
1664 while ((c = *string++) != 0)
1668 if (c == '\"' || c == '\\')
1669 putc ('\\', asm_file);
1673 fprintf (asm_file, "\\%03o", c);
1675 putc ('\"', asm_file);
1679 /* Output a file name in the form wanted by System V. */
1682 output_file_directive (asm_file, input_name)
1684 const char *input_name;
1686 int len = strlen (input_name);
1687 const char *na = input_name + len;
1689 /* NA gets INPUT_NAME sans directory names. */
1690 while (na > input_name)
1692 if (IS_DIR_SEPARATOR (na[-1]))
1697 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1698 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1700 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1701 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1703 fprintf (asm_file, "\t.file\t");
1704 output_quoted_string (asm_file, na);
1705 fputc ('\n', asm_file);
1710 /* Routine to open a dump file. Return true if the dump file is enabled. */
1713 open_dump_file (index, decl)
1714 enum dump_file_index index;
1718 const char *open_arg;
1721 if (! dump_file[index].enabled)
1724 timevar_push (TV_DUMP);
1725 if (rtl_dump_file != NULL)
1726 fclose (rtl_dump_file);
1728 sprintf (seq, DUMPFILE_FORMAT, index);
1730 if (! dump_file[index].initialized)
1732 /* If we've not initialized the files, do so now. */
1733 if (graph_dump_format != no_graph
1734 && dump_file[index].graph_dump_p)
1736 dump_name = concat (seq, dump_file[index].extension, NULL);
1737 clean_graph_dump_file (dump_base_name, dump_name);
1740 dump_file[index].initialized = 1;
1746 dump_name = concat (dump_base_name, seq,
1747 dump_file[index].extension, NULL);
1749 rtl_dump_file = fopen (dump_name, open_arg);
1750 if (rtl_dump_file == NULL)
1751 fatal_io_error ("can't open %s", dump_name);
1756 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1757 (*lang_hooks.decl_printable_name) (decl, 2));
1759 timevar_pop (TV_DUMP);
1763 /* Routine to close a dump file. */
1766 close_dump_file (index, func, insns)
1767 enum dump_file_index index;
1768 void (*func) PARAMS ((FILE *, rtx));
1771 if (! rtl_dump_file)
1774 timevar_push (TV_DUMP);
1776 && graph_dump_format != no_graph
1777 && dump_file[index].graph_dump_p)
1782 sprintf (seq, DUMPFILE_FORMAT, index);
1783 suffix = concat (seq, dump_file[index].extension, NULL);
1784 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1789 func (rtl_dump_file, insns);
1791 fflush (rtl_dump_file);
1792 fclose (rtl_dump_file);
1794 rtl_dump_file = NULL;
1795 timevar_pop (TV_DUMP);
1798 /* Do any final processing required for the declarations in VEC, of
1799 which there are LEN. We write out inline functions and variables
1800 that have been deferred until this point, but which are required.
1801 Returns non-zero if anything was put out. */
1804 wrapup_global_declarations (vec, len)
1811 int output_something = 0;
1813 for (i = 0; i < len; i++)
1817 /* We're not deferring this any longer. */
1818 DECL_DEFER_OUTPUT (decl) = 0;
1820 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1821 (*lang_hooks.finish_incomplete_decl) (decl);
1824 /* Now emit any global variables or functions that we have been
1825 putting off. We need to loop in case one of the things emitted
1826 here references another one which comes earlier in the list. */
1830 for (i = 0; i < len; i++)
1834 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1837 /* Don't write out static consts, unless we still need them.
1839 We also keep static consts if not optimizing (for debugging),
1840 unless the user specified -fno-keep-static-consts.
1841 ??? They might be better written into the debug information.
1842 This is possible when using DWARF.
1844 A language processor that wants static constants to be always
1845 written out (even if it is not used) is responsible for
1846 calling rest_of_decl_compilation itself. E.g. the C front-end
1847 calls rest_of_decl_compilation from finish_decl.
1848 One motivation for this is that is conventional in some
1849 environments to write things like:
1850 static const char rcsid[] = "... version string ...";
1851 intending to force the string to be in the executable.
1853 A language processor that would prefer to have unneeded
1854 static constants "optimized away" would just defer writing
1855 them out until here. E.g. C++ does this, because static
1856 constants are often defined in header files.
1858 ??? A tempting alternative (for both C and C++) would be
1859 to force a constant to be written if and only if it is
1860 defined in a main file, as opposed to an include file. */
1862 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1866 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1868 else if (DECL_COMDAT (decl))
1870 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1871 && (optimize || !flag_keep_static_consts
1872 || DECL_ARTIFICIAL (decl)))
1878 rest_of_decl_compilation (decl, NULL, 1, 1);
1882 if (TREE_CODE (decl) == FUNCTION_DECL
1883 && DECL_INITIAL (decl) != 0
1884 && DECL_SAVED_INSNS (decl) != 0
1885 && (flag_keep_inline_functions
1886 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1887 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1890 output_inline_function (decl);
1895 output_something = 1;
1899 return output_something;
1902 /* Issue appropriate warnings for the global declarations in VEC (of
1903 which there are LEN). Output debugging information for them. */
1906 check_global_declarations (vec, len)
1913 for (i = 0; i < len; i++)
1917 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1918 && ! TREE_ASM_WRITTEN (decl))
1919 /* Cancel the RTL for this decl so that, if debugging info
1920 output for global variables is still to come,
1921 this one will be omitted. */
1922 SET_DECL_RTL (decl, NULL_RTX);
1924 /* Warn about any function
1925 declared static but not defined.
1926 We don't warn about variables,
1927 because many programs have static variables
1928 that exist only to get some text into the object file. */
1929 if (TREE_CODE (decl) == FUNCTION_DECL
1930 && (warn_unused_function
1931 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1932 && DECL_INITIAL (decl) == 0
1933 && DECL_EXTERNAL (decl)
1934 && ! DECL_ARTIFICIAL (decl)
1935 && ! TREE_PUBLIC (decl))
1937 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1938 pedwarn_with_decl (decl,
1939 "`%s' used but never defined");
1941 warning_with_decl (decl,
1942 "`%s' declared `static' but never defined");
1943 /* This symbol is effectively an "extern" declaration now. */
1944 TREE_PUBLIC (decl) = 1;
1945 assemble_external (decl);
1948 /* Warn about static fns or vars defined but not used. */
1949 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1950 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1951 && ! TREE_USED (decl)
1952 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1953 to handle multiple external decls in different scopes. */
1954 && ! TREE_USED (DECL_NAME (decl))
1955 && ! DECL_EXTERNAL (decl)
1956 && ! TREE_PUBLIC (decl)
1957 /* Global register variables must be declared to reserve them. */
1958 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1959 /* Otherwise, ask the language. */
1960 && (*lang_hooks.decls.warn_unused_global) (decl))
1961 warning_with_decl (decl, "`%s' defined but not used");
1963 timevar_push (TV_SYMOUT);
1964 (*debug_hooks->global_decl) (decl);
1965 timevar_pop (TV_SYMOUT);
1969 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
1970 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1971 INPUT_FILENAME and LINENO accordingly. */
1974 push_srcloc (file, line)
1978 struct file_stack *fs;
1980 if (input_file_stack)
1982 input_file_stack->name = input_filename;
1983 input_file_stack->line = lineno;
1986 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
1987 fs->name = input_filename = file;
1988 fs->line = lineno = line;
1989 fs->indent_level = 0;
1990 fs->next = input_file_stack;
1991 input_file_stack = fs;
1992 input_file_stack_tick++;
1995 /* Pop the top entry off the stack of presently open source files.
1996 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2002 struct file_stack *fs;
2004 fs = input_file_stack;
2005 input_file_stack = fs->next;
2007 input_file_stack_tick++;
2008 /* The initial source file is never popped. */
2009 if (!input_file_stack)
2011 input_filename = input_file_stack->name;
2012 lineno = input_file_stack->line;
2015 /* Compile an entire translation unit. Write a file of assembly
2016 output and various debugging dumps. */
2023 /* Initialize yet another pass. */
2025 init_final (main_input_filename);
2026 init_branch_prob (dump_base_name);
2028 timevar_push (TV_PARSE);
2030 /* Call the parser, which parses the entire file (calling
2031 rest_of_compilation for each function). */
2032 (*lang_hooks.parse_file) ();
2034 /* In case there were missing block closers,
2035 get us back to the global binding level. */
2036 (*lang_hooks.clear_binding_stack) ();
2038 /* Compilation is now finished except for writing
2039 what's left of the symbol table output. */
2040 timevar_pop (TV_PARSE);
2042 if (flag_syntax_only)
2045 globals = (*lang_hooks.decls.getdecls) ();
2047 /* Really define vars that have had only a tentative definition.
2048 Really output inline functions that must actually be callable
2049 and have not been output so far. */
2052 int len = list_length (globals);
2053 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2057 /* Process the decls in reverse order--earliest first.
2058 Put them into VEC from back to front, then take out from front. */
2060 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2061 vec[len - i - 1] = decl;
2063 wrapup_global_declarations (vec, len);
2065 /* This must occur after the loop to output deferred functions. Else
2066 the profiler initializer would not be emitted if all the functions
2067 in this compilation unit were deferred.
2069 output_func_start_profiler can not cause any additional functions or
2070 data to need to be output, so it need not be in the deferred function
2072 output_func_start_profiler ();
2074 check_global_declarations (vec, len);
2080 /* Write out any pending weak symbol declarations. */
2084 /* Do dbx symbols. */
2085 timevar_push (TV_SYMOUT);
2087 #ifdef DWARF2_UNWIND_INFO
2088 if (dwarf2out_do_frame ())
2089 dwarf2out_frame_finish ();
2092 (*debug_hooks->finish) (main_input_filename);
2093 timevar_pop (TV_SYMOUT);
2095 /* Output some stuff at end of file if nec. */
2097 dw2_output_indirect_constants ();
2099 end_final (dump_base_name);
2101 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2103 timevar_push (TV_DUMP);
2104 open_dump_file (DFI_bp, NULL);
2108 close_dump_file (DFI_bp, NULL, NULL_RTX);
2109 timevar_pop (TV_DUMP);
2113 ASM_FILE_END (asm_out_file);
2116 /* Attach a special .ident directive to the end of the file to identify
2117 the version of GCC which compiled this code. The format of the .ident
2118 string is patterned after the ones produced by native SVR4 compilers. */
2121 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2122 IDENT_ASM_OP, version_string);
2125 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2127 timevar_push (TV_DUMP);
2128 dump_combine_total_stats (rtl_dump_file);
2129 close_dump_file (DFI_combine, NULL, NULL_RTX);
2130 timevar_pop (TV_DUMP);
2134 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2135 and TYPE_DECL nodes.
2137 This does nothing for local (non-static) variables, unless the
2138 variable is a register variable with an ASMSPEC. In that case, or
2139 if the variable is not an automatic, it sets up the RTL and
2140 outputs any assembler code (label definition, storage allocation
2141 and initialization).
2143 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2144 the assembler symbol name to be used. TOP_LEVEL is nonzero
2145 if this declaration is not within a function. */
2148 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2150 const char *asmspec;
2154 /* Declarations of variables, and of functions defined elsewhere. */
2156 /* The most obvious approach, to put an #ifndef around where
2157 this macro is used, doesn't work since it's inside a macro call. */
2158 #ifndef ASM_FINISH_DECLARE_OBJECT
2159 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2162 /* We deferred calling assemble_alias so that we could collect
2163 other attributes such as visibility. Emit the alias now. */
2166 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2169 alias = TREE_VALUE (TREE_VALUE (alias));
2170 alias = get_identifier (TREE_STRING_POINTER (alias));
2171 assemble_alias (decl, alias);
2175 /* Forward declarations for nested functions are not "external",
2176 but we need to treat them as if they were. */
2177 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2178 || TREE_CODE (decl) == FUNCTION_DECL)
2180 timevar_push (TV_VARCONST);
2183 make_decl_rtl (decl, asmspec);
2185 /* Don't output anything when a tentative file-scope definition
2186 is seen. But at end of compilation, do output code for them. */
2187 if (at_end || !DECL_DEFER_OUTPUT (decl))
2188 assemble_variable (decl, top_level, at_end, 0);
2189 if (decl == last_assemble_variable_decl)
2191 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2195 timevar_pop (TV_VARCONST);
2197 else if (DECL_REGISTER (decl) && asmspec != 0)
2199 if (decode_reg_name (asmspec) >= 0)
2201 SET_DECL_RTL (decl, NULL_RTX);
2202 make_decl_rtl (decl, asmspec);
2206 error ("invalid register name `%s' for register variable", asmspec);
2207 DECL_REGISTER (decl) = 0;
2212 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2213 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2214 && TREE_CODE (decl) == TYPE_DECL)
2216 timevar_push (TV_SYMOUT);
2217 dbxout_symbol (decl, 0);
2218 timevar_pop (TV_SYMOUT);
2221 #ifdef SDB_DEBUGGING_INFO
2222 else if (write_symbols == SDB_DEBUG && top_level
2223 && TREE_CODE (decl) == TYPE_DECL)
2225 timevar_push (TV_SYMOUT);
2226 sdbout_symbol (decl, 0);
2227 timevar_pop (TV_SYMOUT);
2232 /* Called after finishing a record, union or enumeral type. */
2235 rest_of_type_compilation (type, toplev)
2236 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2240 tree type ATTRIBUTE_UNUSED;
2241 int toplev ATTRIBUTE_UNUSED;
2244 timevar_push (TV_SYMOUT);
2245 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2246 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2247 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2249 #ifdef SDB_DEBUGGING_INFO
2250 if (write_symbols == SDB_DEBUG)
2251 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2253 #ifdef DWARF2_DEBUGGING_INFO
2254 if ((write_symbols == DWARF2_DEBUG
2255 || write_symbols == VMS_AND_DWARF2_DEBUG)
2257 dwarf2out_decl (TYPE_STUB_DECL (type));
2259 timevar_pop (TV_SYMOUT);
2262 /* This is called from finish_function (within langhooks.parse_file)
2263 after each top-level definition is parsed.
2264 It is supposed to compile that function or variable
2265 and output the assembler code for it.
2266 After we return, the tree storage is freed. */
2269 rest_of_compilation (decl)
2275 int rebuild_label_notes_after_reload;
2276 int register_life_up_to_date;
2278 timevar_push (TV_REST_OF_COMPILATION);
2280 /* Now that we're out of the frontend, we shouldn't have any more
2281 CONCATs anywhere. */
2282 generating_concat_p = 0;
2284 /* When processing delayed functions, prepare_function_start() won't
2285 have been run to re-initialize it. */
2286 cse_not_expected = ! optimize;
2288 /* First, make sure that NOTE_BLOCK is set correctly for each
2289 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2290 if (!cfun->x_whole_function_mode_p)
2293 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2294 tree in sensible shape. So, we just recalculate it here. */
2295 if (cfun->x_whole_function_mode_p)
2300 /* If we are reconsidering an inline function
2301 at the end of compilation, skip the stuff for making it inline. */
2303 if (DECL_SAVED_INSNS (decl) == 0)
2309 /* If this is nested inside an inlined external function, pretend
2310 it was only declared. Since we cannot inline such functions,
2311 generating code for this one is not only not necessary but will
2312 confuse some debugging output writers. */
2313 for (parent = DECL_CONTEXT (current_function_decl);
2314 parent != NULL_TREE;
2315 parent = get_containing_scope (parent))
2316 if (TREE_CODE (parent) == FUNCTION_DECL
2317 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2319 DECL_INITIAL (decl) = 0;
2320 goto exit_rest_of_compilation;
2323 /* If requested, consider whether to make this function inline. */
2324 if ((DECL_INLINE (decl) && !flag_no_inline)
2325 || flag_inline_functions)
2327 timevar_push (TV_INTEGRATION);
2328 lose = function_cannot_inline_p (decl);
2329 timevar_pop (TV_INTEGRATION);
2330 if (lose || ! optimize)
2332 if (warn_inline && DECL_INLINE (decl))
2333 warning_with_decl (decl, lose);
2334 DECL_ABSTRACT_ORIGIN (decl) = 0;
2335 /* Don't really compile an extern inline function.
2336 If we can't make it inline, pretend
2337 it was only declared. */
2338 if (DECL_EXTERNAL (decl))
2340 DECL_INITIAL (decl) = 0;
2341 goto exit_rest_of_compilation;
2345 /* ??? Note that this has the effect of making it look
2346 like "inline" was specified for a function if we choose
2347 to inline it. This isn't quite right, but it's
2348 probably not worth the trouble to fix. */
2349 inlinable = DECL_INLINE (decl) = 1;
2352 insns = get_insns ();
2354 /* Dump the rtl code if we are dumping rtl. */
2356 if (open_dump_file (DFI_rtl, decl))
2358 if (DECL_SAVED_INSNS (decl))
2359 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2360 close_dump_file (DFI_rtl, print_rtl, insns);
2363 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2364 sorts of eh initialization. Delay this until after the
2365 initial rtl dump so that we can see the original nesting. */
2366 convert_from_eh_region_ranges ();
2368 /* If function is inline, and we don't yet know whether to
2369 compile it by itself, defer decision till end of compilation.
2370 finish_compilation will call rest_of_compilation again
2371 for those functions that need to be output. Also defer those
2372 functions that we are supposed to defer. */
2375 || (DECL_INLINE (decl)
2376 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2377 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2378 && ! flag_keep_inline_functions)
2379 || DECL_EXTERNAL (decl))))
2380 DECL_DEFER_OUTPUT (decl) = 1;
2382 if (DECL_INLINE (decl))
2383 /* DWARF wants separate debugging info for abstract and
2384 concrete instances of all inline functions, including those
2385 declared inline but not inlined, and those inlined even
2386 though they weren't declared inline. Conveniently, that's
2387 what DECL_INLINE means at this point. */
2388 (*debug_hooks->deferred_inline_function) (decl);
2390 if (DECL_DEFER_OUTPUT (decl))
2392 /* If -Wreturn-type, we have to do a bit of compilation. We just
2393 want to call cleanup the cfg to figure out whether or not we can
2394 fall off the end of the function; we do the minimum amount of
2395 work necessary to make that safe. */
2396 if (warn_return_type)
2398 int saved_optimize = optimize;
2401 rebuild_jump_labels (insns);
2402 find_exception_handler_labels ();
2403 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2404 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2405 optimize = saved_optimize;
2407 /* CFG is no longer maintained up-to-date. */
2408 free_bb_for_insn ();
2411 current_function_nothrow = nothrow_function_p ();
2412 if (current_function_nothrow)
2413 /* Now we know that this can't throw; set the flag for the benefit
2414 of other functions later in this translation unit. */
2415 TREE_NOTHROW (current_function_decl) = 1;
2417 timevar_push (TV_INTEGRATION);
2418 save_for_inline (decl);
2419 timevar_pop (TV_INTEGRATION);
2420 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2421 goto exit_rest_of_compilation;
2424 /* If specified extern inline but we aren't inlining it, we are
2425 done. This goes for anything that gets here with DECL_EXTERNAL
2426 set, not just things with DECL_INLINE. */
2427 if (DECL_EXTERNAL (decl))
2428 goto exit_rest_of_compilation;
2431 /* If we're emitting a nested function, make sure its parent gets
2432 emitted as well. Doing otherwise confuses debug info. */
2435 for (parent = DECL_CONTEXT (current_function_decl);
2436 parent != NULL_TREE;
2437 parent = get_containing_scope (parent))
2438 if (TREE_CODE (parent) == FUNCTION_DECL)
2439 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2442 /* We are now committed to emitting code for this function. Do any
2443 preparation, such as emitting abstract debug info for the inline
2444 before it gets mangled by optimization. */
2445 if (DECL_INLINE (decl))
2446 (*debug_hooks->outlining_inline_function) (decl);
2448 /* Remove any notes we don't need. That will make iterating
2449 over the instruction sequence faster, and allow the garbage
2450 collector to reclaim the memory used by the notes. */
2451 remove_unnecessary_notes ();
2456 /* Initialize some variables used by the optimizers. */
2457 init_function_for_compilation ();
2459 if (! DECL_DEFER_OUTPUT (decl))
2460 TREE_ASM_WRITTEN (decl) = 1;
2462 /* Now that integrate will no longer see our rtl, we need not
2463 distinguish between the return value of this function and the
2464 return value of called functions. Also, we can remove all SETs
2465 of subregs of hard registers; they are only here because of
2466 integrate. Also, we can now initialize pseudos intended to
2467 carry magic hard reg data throughout the function. */
2468 rtx_equal_function_value_matters = 0;
2469 purge_hard_subreg_sets (get_insns ());
2471 /* Early return if there were errors. We can run afoul of our
2472 consistency checks, and there's not really much point in fixing them.
2473 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2474 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2475 || errorcount || sorrycount)
2476 goto exit_rest_of_compilation;
2478 /* We may have potential sibling or tail recursion sites. Select one
2479 (of possibly multiple) methods of performing the call. */
2480 if (flag_optimize_sibling_calls)
2482 timevar_push (TV_JUMP);
2483 open_dump_file (DFI_sibling, decl);
2485 optimize_sibling_and_tail_recursive_calls ();
2487 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2488 timevar_pop (TV_JUMP);
2491 /* Complete generation of exception handling code. */
2492 find_exception_handler_labels ();
2495 timevar_push (TV_JUMP);
2496 open_dump_file (DFI_eh, decl);
2498 finish_eh_generation ();
2500 close_dump_file (DFI_eh, print_rtl, get_insns ());
2501 timevar_pop (TV_JUMP);
2504 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2505 generation, which might create new sets. */
2506 emit_initial_value_sets ();
2509 /* If we are doing position-independent code generation, now
2510 is the time to output special prologues and epilogues.
2511 We do not want to do this earlier, because it just clutters
2512 up inline functions with meaningless insns. */
2517 insns = get_insns ();
2519 /* Copy any shared structure that should not be shared. */
2520 unshare_all_rtl (current_function_decl, insns);
2522 #ifdef SETJMP_VIA_SAVE_AREA
2523 /* This must be performed before virtual register instantiation. */
2524 if (current_function_calls_alloca)
2525 optimize_save_area_alloca (insns);
2528 /* Instantiate all virtual registers. */
2529 instantiate_virtual_regs (current_function_decl, insns);
2531 open_dump_file (DFI_jump, decl);
2533 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2534 are initialized and to compute whether control can drop off the end
2537 timevar_push (TV_JUMP);
2538 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2539 before jump optimization switches branch directions. */
2540 expected_value_to_br_prob ();
2542 reg_scan (insns, max_reg_num (), 0);
2543 rebuild_jump_labels (insns);
2544 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2546 dump_flow_info (rtl_dump_file);
2547 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2548 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2550 /* CFG is no longer maintained up-to-date. */
2551 free_bb_for_insn ();
2552 copy_loop_headers (insns);
2553 purge_line_number_notes (insns);
2555 timevar_pop (TV_JUMP);
2556 close_dump_file (DFI_jump, print_rtl, insns);
2558 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2559 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2561 goto exit_rest_of_compilation;
2564 /* Long term, this should probably move before the jump optimizer too,
2565 but I didn't want to disturb the rtl_dump_and_exit and related
2566 stuff at this time. */
2567 if (optimize > 0 && flag_ssa)
2569 /* Convert to SSA form. */
2571 timevar_push (TV_TO_SSA);
2572 open_dump_file (DFI_ssa, decl);
2574 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2575 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2578 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2579 timevar_pop (TV_TO_SSA);
2581 /* Perform sparse conditional constant propagation, if requested. */
2584 timevar_push (TV_SSA_CCP);
2585 open_dump_file (DFI_ssa_ccp, decl);
2589 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2590 timevar_pop (TV_SSA_CCP);
2593 /* It would be useful to cleanup the CFG at this point, but block
2594 merging and possibly other transformations might leave a PHI
2595 node in the middle of a basic block, which is a strict no-no. */
2597 /* The SSA implementation uses basic block numbers in its phi
2598 nodes. Thus, changing the control-flow graph or the basic
2599 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2600 may cause problems. */
2604 /* Remove dead code. */
2606 timevar_push (TV_SSA_DCE);
2607 open_dump_file (DFI_ssa_dce, decl);
2609 insns = get_insns ();
2610 ssa_eliminate_dead_code();
2612 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2613 timevar_pop (TV_SSA_DCE);
2616 /* Convert from SSA form. */
2618 timevar_push (TV_FROM_SSA);
2619 open_dump_file (DFI_ussa, decl);
2621 convert_from_ssa ();
2622 /* New registers have been created. Rescan their usage. */
2623 reg_scan (insns, max_reg_num (), 1);
2625 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2626 timevar_pop (TV_FROM_SSA);
2629 /* CFG is no longer maintained up-to-date. */
2630 free_bb_for_insn ();
2633 timevar_push (TV_JUMP);
2637 open_dump_file (DFI_null, decl);
2638 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2640 dump_flow_info (rtl_dump_file);
2641 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2643 /* Try to identify useless null pointer tests and delete them. */
2644 if (flag_delete_null_pointer_checks)
2645 delete_null_pointer_checks (insns);
2647 timevar_push (TV_IFCVT);
2649 timevar_pop (TV_IFCVT);
2650 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2651 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2654 /* Jump optimization, and the removal of NULL pointer checks, may
2655 have reduced the number of instructions substantially. CSE, and
2656 future passes, allocate arrays whose dimensions involve the
2657 maximum instruction UID, so if we can reduce the maximum UID
2658 we'll save big on memory. */
2659 renumber_insns (rtl_dump_file);
2661 compute_bb_for_insn (get_max_uid ());
2662 timevar_pop (TV_JUMP);
2664 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2668 /* Perform common subexpression elimination.
2669 Nonzero value from `cse_main' means that jumps were simplified
2670 and some code may now be unreachable, so do
2671 jump optimization again. */
2675 open_dump_file (DFI_cse, decl);
2677 dump_flow_info (rtl_dump_file);
2678 timevar_push (TV_CSE);
2680 reg_scan (insns, max_reg_num (), 1);
2682 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2684 rebuild_jump_labels (insns);
2685 purge_all_dead_edges (0);
2687 delete_trivially_dead_insns (insns, max_reg_num ());
2689 /* If we are not running more CSE passes, then we are no longer
2690 expecting CSE to be run. But always rerun it in a cheap mode. */
2691 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2693 if (tem || optimize > 1)
2694 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2695 /* Try to identify useless null pointer tests and delete them. */
2696 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2698 timevar_push (TV_JUMP);
2700 if (flag_delete_null_pointer_checks)
2701 delete_null_pointer_checks (insns);
2702 /* CFG is no longer maintained up-to-date. */
2703 timevar_pop (TV_JUMP);
2706 /* The second pass of jump optimization is likely to have
2707 removed a bunch more instructions. */
2708 renumber_insns (rtl_dump_file);
2709 compute_bb_for_insn (get_max_uid ());
2711 timevar_pop (TV_CSE);
2712 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2715 open_dump_file (DFI_addressof, decl);
2717 purge_addressof (insns);
2719 purge_all_dead_edges (0);
2720 reg_scan (insns, max_reg_num (), 1);
2722 close_dump_file (DFI_addressof, print_rtl, insns);
2726 /* Perform global cse. */
2728 if (optimize > 0 && flag_gcse)
2730 int save_csb, save_cfj;
2733 timevar_push (TV_GCSE);
2734 open_dump_file (DFI_gcse, decl);
2736 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2737 tem = gcse_main (insns, rtl_dump_file);
2738 rebuild_jump_labels (insns);
2739 delete_trivially_dead_insns (insns, max_reg_num ());
2741 save_csb = flag_cse_skip_blocks;
2742 save_cfj = flag_cse_follow_jumps;
2743 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2745 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2747 if (flag_expensive_optimizations)
2749 timevar_push (TV_CSE);
2750 reg_scan (insns, max_reg_num (), 1);
2751 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2752 purge_all_dead_edges (0);
2753 delete_trivially_dead_insns (insns, max_reg_num ());
2754 timevar_pop (TV_CSE);
2755 cse_not_expected = !flag_rerun_cse_after_loop;
2758 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2759 things up. Then possibly re-run CSE again. */
2763 timevar_push (TV_JUMP);
2764 rebuild_jump_labels (insns);
2765 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2766 timevar_pop (TV_JUMP);
2768 if (flag_expensive_optimizations)
2770 timevar_push (TV_CSE);
2771 reg_scan (insns, max_reg_num (), 1);
2772 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2773 purge_all_dead_edges (0);
2774 delete_trivially_dead_insns (insns, max_reg_num ());
2775 timevar_pop (TV_CSE);
2779 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2780 timevar_pop (TV_GCSE);
2783 flag_cse_skip_blocks = save_csb;
2784 flag_cse_follow_jumps = save_cfj;
2785 #ifdef ENABLE_CHECKING
2786 verify_flow_info ();
2790 /* Move constant computations out of loops. */
2792 if (optimize > 0 && flag_loop_optimize)
2794 timevar_push (TV_LOOP);
2795 delete_dead_jumptables ();
2796 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2797 open_dump_file (DFI_loop, decl);
2798 /* CFG is no longer maintained up-to-date. */
2799 free_bb_for_insn ();
2801 if (flag_rerun_loop_opt)
2803 cleanup_barriers ();
2805 /* We only want to perform unrolling once. */
2806 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2808 /* The first call to loop_optimize makes some instructions
2809 trivially dead. We delete those instructions now in the
2810 hope that doing so will make the heuristics in loop work
2811 better and possibly speed up compilation. */
2812 delete_trivially_dead_insns (insns, max_reg_num ());
2814 /* The regscan pass is currently necessary as the alias
2815 analysis code depends on this information. */
2816 reg_scan (insns, max_reg_num (), 1);
2818 cleanup_barriers ();
2819 loop_optimize (insns, rtl_dump_file,
2820 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2821 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2823 /* Loop can create trivially dead instructions. */
2824 delete_trivially_dead_insns (insns, max_reg_num ());
2825 close_dump_file (DFI_loop, print_rtl, insns);
2826 timevar_pop (TV_LOOP);
2831 /* Do control and data flow analysis; wrote some of the results to
2834 timevar_push (TV_FLOW);
2835 open_dump_file (DFI_cfg, decl);
2837 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2839 dump_flow_info (rtl_dump_file);
2840 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2841 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2843 /* It may make more sense to mark constant functions after dead code is
2844 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2845 may insert code making function non-constant, but we still must consider
2846 it as constant, otherwise -fbranch-probabilities will not read data back.
2848 life_analyzis rarely eliminates modification of external memory.
2851 mark_constant_function ();
2853 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2855 /* Do branch profiling and static profile estimation passes. */
2856 if (optimize > 0 || profile_arc_flag || flag_test_coverage
2857 || flag_branch_probabilities)
2861 timevar_push (TV_BRANCH_PROB);
2862 open_dump_file (DFI_bp, decl);
2863 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2866 /* Discover and record the loop depth at the head of each basic
2867 block. The loop infrastructure does the real job for us. */
2868 flow_loops_find (&loops, LOOP_TREE);
2870 /* Estimate using heuristics if no profiling info is available. */
2871 if (flag_guess_branch_prob)
2872 estimate_probability (&loops);
2875 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2877 flow_loops_free (&loops);
2878 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2879 timevar_pop (TV_BRANCH_PROB);
2884 timevar_push (TV_CSE2);
2885 open_dump_file (DFI_cse2, decl);
2887 dump_flow_info (rtl_dump_file);
2889 if (flag_rerun_cse_after_loop)
2891 timevar_push (TV_JUMP);
2893 reg_scan (insns, max_reg_num (), 0);
2895 timevar_push (TV_IFCVT);
2896 cleanup_cfg (CLEANUP_EXPENSIVE);
2898 timevar_pop(TV_IFCVT);
2900 timevar_pop (TV_JUMP);
2901 /* CFG is no longer maintained up-to-date. */
2902 reg_scan (insns, max_reg_num (), 0);
2903 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2904 purge_all_dead_edges (0);
2905 delete_trivially_dead_insns (insns, max_reg_num ());
2909 timevar_push (TV_JUMP);
2910 rebuild_jump_labels (insns);
2911 cleanup_cfg (CLEANUP_EXPENSIVE);
2912 timevar_pop (TV_JUMP);
2916 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2917 timevar_pop (TV_CSE2);
2922 cse_not_expected = 1;
2924 open_dump_file (DFI_life, decl);
2927 check_function_return_warnings ();
2929 #ifdef ENABLE_CHECKING
2930 verify_flow_info ();
2932 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2934 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2935 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2936 timevar_pop (TV_FLOW);
2940 if (warn_uninitialized || extra_warnings)
2942 uninitialized_vars_warning (DECL_INITIAL (decl));
2944 setjmp_args_warning ();
2950 if (initialize_uninitialized_subregs ())
2952 /* Insns were inserted, so things might look a bit different. */
2953 insns = get_insns ();
2954 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
2955 PROP_LOG_LINKS | PROP_REG_INFO
2956 | PROP_DEATH_NOTES);
2960 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2964 /* If -opt, try combining insns through substitution. */
2968 int rebuild_jump_labels_after_combine = 0;
2970 timevar_push (TV_COMBINE);
2971 open_dump_file (DFI_combine, decl);
2973 rebuild_jump_labels_after_combine
2974 = combine_instructions (insns, max_reg_num ());
2976 /* Combining insns may have turned an indirect jump into a
2977 direct jump. Rebuid the JUMP_LABEL fields of jumping
2979 if (rebuild_jump_labels_after_combine)
2981 timevar_push (TV_JUMP);
2982 rebuild_jump_labels (insns);
2983 timevar_pop (TV_JUMP);
2985 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2988 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2989 timevar_pop (TV_COMBINE);
2994 /* Rerun if-conversion, as combine may have simplified things enough to
2995 now meet sequence length restrictions. */
2998 timevar_push (TV_IFCVT);
2999 open_dump_file (DFI_ce, decl);
3005 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3006 timevar_pop (TV_IFCVT);
3009 /* Register allocation pre-pass, to reduce number of moves
3010 necessary for two-address machines. */
3011 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3013 timevar_push (TV_REGMOVE);
3014 open_dump_file (DFI_regmove, decl);
3016 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3018 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3019 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3020 timevar_pop (TV_REGMOVE);
3025 /* Do unconditional splitting before register allocation to allow machine
3026 description to add extra information not needed previously. */
3027 split_all_insns (1);
3029 /* Any of the several passes since flow1 will have munged register
3030 lifetime data a bit. */
3031 register_life_up_to_date = 0;
3033 #ifdef OPTIMIZE_MODE_SWITCHING
3034 timevar_push (TV_MODE_SWITCH);
3037 optimize_mode_switching (NULL);
3040 timevar_pop (TV_MODE_SWITCH);
3043 timevar_push (TV_SCHED);
3045 #ifdef INSN_SCHEDULING
3047 /* Print function header into sched dump now
3048 because doing the sched analysis makes some of the dump. */
3049 if (optimize > 0 && flag_schedule_insns)
3051 open_dump_file (DFI_sched, decl);
3053 /* Do control and data sched analysis,
3054 and write some of the results to dump file. */
3056 schedule_insns (rtl_dump_file);
3058 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3060 /* Register lifetime information was updated as part of verifying
3062 register_life_up_to_date = 1;
3065 timevar_pop (TV_SCHED);
3069 /* Determine if the current function is a leaf before running reload
3070 since this can impact optimizations done by the prologue and
3071 epilogue thus changing register elimination offsets. */
3072 current_function_is_leaf = leaf_function_p ();
3074 timevar_push (TV_LOCAL_ALLOC);
3075 open_dump_file (DFI_lreg, decl);
3077 /* Allocate pseudo-regs that are used only within 1 basic block.
3079 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3080 jump optimizer after register allocation and reloading are finished. */
3082 if (! register_life_up_to_date)
3083 recompute_reg_usage (insns, ! optimize_size);
3085 /* Allocate the reg_renumber array. */
3086 allocate_reg_info (max_regno, FALSE, TRUE);
3088 /* And the reg_equiv_memory_loc array. */
3089 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3091 allocate_initial_values (reg_equiv_memory_loc);
3093 regclass (insns, max_reg_num (), rtl_dump_file);
3094 rebuild_label_notes_after_reload = local_alloc ();
3096 timevar_pop (TV_LOCAL_ALLOC);
3098 if (dump_file[DFI_lreg].enabled)
3100 timevar_push (TV_DUMP);
3102 dump_flow_info (rtl_dump_file);
3103 dump_local_alloc (rtl_dump_file);
3105 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3106 timevar_pop (TV_DUMP);
3111 timevar_push (TV_GLOBAL_ALLOC);
3112 open_dump_file (DFI_greg, decl);
3114 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3115 pass fixing up any insns that are invalid. */
3118 failure = global_alloc (rtl_dump_file);
3121 build_insn_chain (insns);
3122 failure = reload (insns, 0);
3125 timevar_pop (TV_GLOBAL_ALLOC);
3127 if (dump_file[DFI_greg].enabled)
3129 timevar_push (TV_DUMP);
3131 dump_global_regs (rtl_dump_file);
3133 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3134 timevar_pop (TV_DUMP);
3138 goto exit_rest_of_compilation;
3142 open_dump_file (DFI_postreload, decl);
3144 /* Do a very simple CSE pass over just the hard registers. */
3147 timevar_push (TV_RELOAD_CSE_REGS);
3148 reload_cse_regs (insns);
3149 timevar_pop (TV_RELOAD_CSE_REGS);
3152 /* Register allocation and reloading may have turned an indirect jump into
3153 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3154 jumping instructions. */
3155 if (rebuild_label_notes_after_reload)
3157 timevar_push (TV_JUMP);
3159 rebuild_jump_labels (insns);
3160 purge_all_dead_edges (0);
3162 timevar_pop (TV_JUMP);
3165 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3167 /* Re-create the death notes which were deleted during reload. */
3168 timevar_push (TV_FLOW2);
3169 open_dump_file (DFI_flow2, decl);
3171 #ifdef ENABLE_CHECKING
3172 verify_flow_info ();
3175 /* If optimizing, then go ahead and split insns now. */
3177 split_all_insns (0);
3179 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3181 /* On some machines, the prologue and epilogue code, or parts thereof,
3182 can be represented as RTL. Doing so lets us schedule insns between
3183 it and the rest of the code and also allows delayed branch
3184 scheduling to operate in the epilogue. */
3185 thread_prologue_and_epilogue_insns (insns);
3189 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3190 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3191 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3193 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3194 even for machines with possibly nonzero RETURN_POPS_ARGS
3195 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3196 push instructions will have popping returns. */
3197 #ifndef PUSH_ROUNDING
3198 if (!ACCUMULATE_OUTGOING_ARGS)
3200 combine_stack_adjustments ();
3205 flow2_completed = 1;
3207 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3208 timevar_pop (TV_FLOW2);
3210 #ifdef HAVE_peephole2
3211 if (optimize > 0 && flag_peephole2)
3213 timevar_push (TV_PEEPHOLE2);
3214 open_dump_file (DFI_peephole2, decl);
3216 peephole2_optimize (rtl_dump_file);
3218 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3219 timevar_pop (TV_PEEPHOLE2);
3223 if (flag_rename_registers || flag_cprop_registers)
3225 timevar_push (TV_RENAME_REGISTERS);
3226 open_dump_file (DFI_rnreg, decl);
3228 if (flag_rename_registers)
3229 regrename_optimize ();
3230 if (flag_cprop_registers)
3231 copyprop_hardreg_forward ();
3233 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3234 timevar_pop (TV_RENAME_REGISTERS);
3239 timevar_push (TV_IFCVT2);
3240 open_dump_file (DFI_ce2, decl);
3244 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3245 timevar_pop (TV_IFCVT2);
3249 split_all_insns (1);
3252 #ifdef INSN_SCHEDULING
3253 if (optimize > 0 && flag_schedule_insns_after_reload)
3255 timevar_push (TV_SCHED2);
3256 open_dump_file (DFI_sched2, decl);
3258 /* Do control and data sched analysis again,
3259 and write some more of the results to dump file. */
3261 split_all_insns (1);
3263 schedule_insns (rtl_dump_file);
3265 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3266 timevar_pop (TV_SCHED2);
3272 #ifdef LEAF_REGISTERS
3273 current_function_uses_only_leaf_regs
3274 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3278 timevar_push (TV_REG_STACK);
3279 open_dump_file (DFI_stack, decl);
3281 reg_to_stack (insns, rtl_dump_file);
3283 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3284 timevar_pop (TV_REG_STACK);
3290 timevar_push (TV_REORDER_BLOCKS);
3291 open_dump_file (DFI_bbro, decl);
3293 /* Last attempt to optimize CFG, as scheduling, peepholing
3294 and insn splitting possibly introduced more crossjumping
3296 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3297 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3298 if (flag_reorder_blocks)
3300 reorder_basic_blocks ();
3301 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3304 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3305 timevar_pop (TV_REORDER_BLOCKS);
3307 compute_alignments ();
3309 /* CFG is no longer maintained up-to-date. */
3310 free_bb_for_insn ();
3312 /* If a machine dependent reorganization is needed, call it. */
3313 #ifdef MACHINE_DEPENDENT_REORG
3314 timevar_push (TV_MACH_DEP);
3315 open_dump_file (DFI_mach, decl);
3317 MACHINE_DEPENDENT_REORG (insns);
3319 close_dump_file (DFI_mach, print_rtl, insns);
3320 timevar_pop (TV_MACH_DEP);
3325 purge_line_number_notes (insns);
3326 cleanup_barriers ();
3328 /* If a scheduling pass for delayed branches is to be done,
3329 call the scheduling code. */
3332 if (optimize > 0 && flag_delayed_branch)
3334 timevar_push (TV_DBR_SCHED);
3335 open_dump_file (DFI_dbr, decl);
3337 dbr_schedule (insns, rtl_dump_file);
3339 close_dump_file (DFI_dbr, print_rtl, insns);
3340 timevar_pop (TV_DBR_SCHED);
3346 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3347 timevar_push (TV_SHORTEN_BRANCH);
3348 split_all_insns_noflow ();
3349 timevar_pop (TV_SHORTEN_BRANCH);
3352 convert_to_eh_region_ranges ();
3354 /* Shorten branches. */
3355 timevar_push (TV_SHORTEN_BRANCH);
3356 shorten_branches (get_insns ());
3357 timevar_pop (TV_SHORTEN_BRANCH);
3359 current_function_nothrow = nothrow_function_p ();
3360 if (current_function_nothrow)
3361 /* Now we know that this can't throw; set the flag for the benefit
3362 of other functions later in this translation unit. */
3363 TREE_NOTHROW (current_function_decl) = 1;
3365 /* Now turn the rtl into assembler code. */
3367 timevar_push (TV_FINAL);
3372 /* Get the function's name, as described by its RTL. This may be
3373 different from the DECL_NAME name used in the source file. */
3375 x = DECL_RTL (decl);
3376 if (GET_CODE (x) != MEM)
3379 if (GET_CODE (x) != SYMBOL_REF)
3381 fnname = XSTR (x, 0);
3383 assemble_start_function (decl, fnname);
3384 final_start_function (insns, asm_out_file, optimize);
3385 final (insns, asm_out_file, optimize, 0);
3386 final_end_function ();
3388 #ifdef IA64_UNWIND_INFO
3389 /* ??? The IA-64 ".handlerdata" directive must be issued before
3390 the ".endp" directive that closes the procedure descriptor. */
3391 output_function_exception_table ();
3394 assemble_end_function (decl, fnname);
3396 #ifndef IA64_UNWIND_INFO
3397 /* Otherwise, it feels unclean to switch sections in the middle. */
3398 output_function_exception_table ();
3402 fflush (asm_out_file);
3404 /* Release all memory allocated by flow. */
3405 free_basic_block_vars (0);
3407 /* Release all memory held by regsets now. */
3408 regset_release_memory ();
3410 timevar_pop (TV_FINAL);
3414 /* Write DBX symbols if requested. */
3416 /* Note that for those inline functions where we don't initially
3417 know for certain that we will be generating an out-of-line copy,
3418 the first invocation of this routine (rest_of_compilation) will
3419 skip over this code by doing a `goto exit_rest_of_compilation;'.
3420 Later on, finish_compilation will call rest_of_compilation again
3421 for those inline functions that need to have out-of-line copies
3422 generated. During that call, we *will* be routed past here. */
3424 timevar_push (TV_SYMOUT);
3425 (*debug_hooks->function_decl) (decl);
3426 timevar_pop (TV_SYMOUT);
3428 exit_rest_of_compilation:
3430 /* In case the function was not output,
3431 don't leave any temporary anonymous types
3432 queued up for sdb output. */
3433 #ifdef SDB_DEBUGGING_INFO
3434 if (write_symbols == SDB_DEBUG)
3435 sdbout_types (NULL_TREE);
3438 reload_completed = 0;
3439 flow2_completed = 0;
3442 timevar_push (TV_FINAL);
3444 /* Clear out the insn_length contents now that they are no
3446 init_insn_lengths ();
3448 /* Clear out the real_constant_chain before some of the rtx's
3449 it runs through become garbage. */
3450 clear_const_double_mem ();
3452 /* Show no temporary slots allocated. */
3455 free_basic_block_vars (0);
3456 free_bb_for_insn ();
3458 timevar_pop (TV_FINAL);
3460 /* Make sure volatile mem refs aren't considered valid operands for
3461 arithmetic insns. We must call this here if this is a nested inline
3462 function, since the above code leaves us in the init_recog state
3463 (from final.c), and the function context push/pop code does not
3464 save/restore volatile_ok.
3466 ??? Maybe it isn't necessary for expand_start_function to call this
3467 anymore if we do it here? */
3469 init_recog_no_volatile ();
3471 /* We're done with this function. Free up memory if we can. */
3472 free_after_parsing (cfun);
3473 if (! DECL_DEFER_OUTPUT (decl))
3475 free_after_compilation (cfun);
3477 /* Clear integrate.c's pointer to the cfun structure we just
3479 DECL_SAVED_INSNS (decl) = 0;
3485 timevar_pop (TV_REST_OF_COMPILATION);
3495 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3496 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3497 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3498 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3499 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3500 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"));
3502 for (i = ARRAY_SIZE (f_options); i--;)
3504 const char *description = f_options[i].description;
3506 if (description != NULL && * description != 0)
3507 printf (" -f%-21s %s\n",
3508 f_options[i].string, _(description));
3511 printf (_(" -O[number] Set optimization level to [number]\n"));
3512 printf (_(" -Os Optimize for space rather than speed\n"));
3513 for (i = LAST_PARAM; i--;)
3515 const char *description = compiler_params[i].help;
3516 const int length = 21-strlen(compiler_params[i].option);
3518 if (description != NULL && * description != 0)
3519 printf (" --param %s=<value>%.*s%s\n",
3520 compiler_params[i].option,
3521 length > 0 ? length : 1, " ",
3524 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3525 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3526 printf (_(" -w Suppress warnings\n"));
3527 printf (_(" -W Enable extra warnings\n"));
3529 for (i = ARRAY_SIZE (W_options); i--;)
3531 const char *description = W_options[i].description;
3533 if (description != NULL && * description != 0)
3534 printf (" -W%-21s %s\n",
3535 W_options[i].string, _(description));
3538 printf (_(" -Wunused Enable unused warnings\n"));
3539 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3540 printf (_(" -p Enable function profiling\n"));
3541 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3542 printf (_(" -a Enable block profiling \n"));
3544 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3545 printf (_(" -ax Enable jump profiling \n"));
3547 printf (_(" -o <file> Place output into <file> \n"));
3549 -G <number> Put global and static data smaller than <number>\n\
3550 bytes into a special section (on some targets)\n"));
3552 for (i = ARRAY_SIZE (debug_args); i--;)
3554 if (debug_args[i].description != NULL)
3555 printf (" -g%-21s %s\n",
3556 debug_args[i].arg, _(debug_args[i].description));
3559 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3560 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3561 printf (_(" -version Display the compiler's version\n"));
3562 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3563 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3564 #if defined INSN_SCHEDULING
3565 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3567 printf (_(" --help Display this information\n"));
3572 /* Display descriptions of language specific options.
3573 If there is no description, note that there is an undocumented option.
3574 If the description is empty, do not display anything. (This allows
3575 options to be deliberately undocumented, for whatever reason).
3576 If the option string is missing, then this is a marker, indicating
3577 that the description string is in fact the name of a language, whose
3578 language specific options are to follow. */
3580 if (ARRAY_SIZE (documented_lang_options) > 1)
3582 printf (_("\nLanguage specific options:\n"));
3584 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3586 const char *description = documented_lang_options[i].description;
3587 const char *option = documented_lang_options[i].option;
3589 if (description == NULL)
3594 printf (_(" %-23.23s [undocumented]\n"), option);
3596 else if (*description == 0)
3598 else if (option == NULL)
3602 (_("\nThere are undocumented %s specific options as well.\n"),
3606 printf (_("\n Options for %s:\n"), description);
3611 printf (" %-23.23s %s\n", option, _(description));
3616 printf (_("\nThere are undocumented %s specific options as well.\n"),
3619 display_target_options ();
3623 display_target_options ()
3626 static bool displayed = false;
3628 /* Avoid double printing for --help --target-help. */
3633 if (ARRAY_SIZE (target_switches) > 1
3634 #ifdef TARGET_OPTIONS
3635 || ARRAY_SIZE (target_options) > 1
3643 printf (_("\nTarget specific options:\n"));
3645 for (i = ARRAY_SIZE (target_switches); i--;)
3647 const char *option = target_switches[i].name;
3648 const char *description = target_switches[i].description;
3650 if (option == NULL || *option == 0)
3652 else if (description == NULL)
3657 printf (_(" -m%-23.23s [undocumented]\n"), option);
3659 else if (* description != 0)
3660 doc += printf (" -m%-23.23s %s\n", option, _(description));
3663 #ifdef TARGET_OPTIONS
3664 for (i = ARRAY_SIZE (target_options); i--;)
3666 const char *option = target_options[i].prefix;
3667 const char *description = target_options[i].description;
3669 if (option == NULL || *option == 0)
3671 else if (description == NULL)
3676 printf (_(" -m%-23.23s [undocumented]\n"), option);
3678 else if (* description != 0)
3679 doc += printf (" -m%-23.23s %s\n", option, _(description));
3685 printf (_("\nThere are undocumented target specific options as well.\n"));
3687 printf (_(" They exist, but they are not documented.\n"));
3692 /* Parse a -d... command line switch. */
3695 decode_d_option (arg)
3704 for (i = 0; i < (int) DFI_MAX; ++i)
3705 dump_file[i].enabled = 1;
3711 flag_print_asm_name = 1;
3714 flag_dump_rtl_in_asm = 1;
3715 flag_print_asm_name = 1;
3718 graph_dump_format = vcg;
3721 rtl_dump_and_exit = 1;
3724 (*lang_hooks.set_yydebug) (1);
3726 case 'D': /* These are handled by the preprocessor. */
3732 for (i = 0; i < (int) DFI_MAX; ++i)
3733 if (c == dump_file[i].debug_switch)
3735 dump_file[i].enabled = 1;
3740 warning ("unrecognized gcc debugging option: %c", c);
3745 /* Parse a -f... command line switch. ARG is the value after the -f.
3746 It is safe to access 'ARG - 2' to generate the full switch name.
3747 Return the number of strings consumed. */
3750 decode_f_option (arg)
3754 const char *option_value = NULL;
3756 /* Search for the option in the table of binary f options. */
3757 for (j = ARRAY_SIZE (f_options); j--;)
3759 if (!strcmp (arg, f_options[j].string))
3761 *f_options[j].variable = f_options[j].on_value;
3765 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3766 && ! strcmp (arg + 3, f_options[j].string))
3768 *f_options[j].variable = ! f_options[j].on_value;
3773 if (!strcmp (arg, "fast-math"))
3774 set_fast_math_flags ();
3775 else if (!strcmp (arg, "no-fast-math"))
3776 set_no_fast_math_flags ();
3777 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3778 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3781 read_integral_parameter (option_value, arg - 2,
3783 set_param_value ("max-inline-insns", val);
3785 #ifdef INSN_SCHEDULING
3786 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3787 fix_sched_param ("verbose", option_value);
3789 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3790 fix_register (option_value, 1, 1);
3791 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3792 fix_register (option_value, 0, 1);
3793 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3794 fix_register (option_value, 0, 0);
3795 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3796 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3797 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3799 = read_integral_parameter (option_value, arg - 2, align_functions);
3800 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3801 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3802 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3804 = read_integral_parameter (option_value, arg - 2, align_labels);
3805 else if ((option_value
3806 = skip_leading_substring (arg, "stack-limit-register=")))
3808 int reg = decode_reg_name (option_value);
3810 error ("unrecognized register name `%s'", option_value);
3812 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3814 else if ((option_value
3815 = skip_leading_substring (arg, "stack-limit-symbol=")))
3818 nm = ggc_strdup (option_value);
3819 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3821 else if ((option_value
3822 = skip_leading_substring (arg, "message-length=")))
3823 output_set_maximum_length
3824 (&global_dc->buffer, read_integral_parameter
3825 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3826 else if ((option_value
3827 = skip_leading_substring (arg, "diagnostics-show-location=")))
3829 if (!strcmp (option_value, "once"))
3830 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3831 else if (!strcmp (option_value, "every-line"))
3832 diagnostic_prefixing_rule (global_dc)
3833 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3835 error ("unrecognized option `%s'", arg - 2);
3837 else if (!strcmp (arg, "no-stack-limit"))
3838 stack_limit_rtx = NULL_RTX;
3839 else if (!strcmp (arg, "preprocessed"))
3840 /* Recognise this switch but do nothing. This prevents warnings
3841 about an unrecognized switch if cpplib has not been linked in. */
3849 /* Parse a -W... command line switch. ARG is the value after the -W.
3850 It is safe to access 'ARG - 2' to generate the full switch name.
3851 Return the number of strings consumed. */
3854 decode_W_option (arg)
3857 const char *option_value = NULL;
3860 /* Search for the option in the table of binary W options. */
3862 for (j = ARRAY_SIZE (W_options); j--;)
3864 if (!strcmp (arg, W_options[j].string))
3866 *W_options[j].variable = W_options[j].on_value;
3870 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3871 && ! strcmp (arg + 3, W_options[j].string))
3873 *W_options[j].variable = ! W_options[j].on_value;
3878 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3879 warning ("-Wid-clash-LEN is no longer supported");
3880 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3882 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3884 warn_larger_than = larger_than_size != -1;
3886 else if (!strcmp (arg, "unused"))
3890 else if (!strcmp (arg, "no-unused"))
3900 /* Parse a -g... command line switch. ARG is the value after the -g.
3901 It is safe to access 'ARG - 2' to generate the full switch name.
3902 Return the number of strings consumed. */
3905 decode_g_option (arg)
3908 static unsigned level=0;
3909 /* A lot of code assumes write_symbols == NO_DEBUG if the
3910 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3911 of what debugging type has been selected). This records the
3912 selected type. It is an error to specify more than one
3914 static enum debug_info_type selected_debug_type = NO_DEBUG;
3915 /* Non-zero if debugging format has been explicitly set.
3916 -g and -ggdb don't explicitly set the debugging format so
3917 -gdwarf -g3 is equivalent to -gdwarf3. */
3918 static int type_explicitly_set_p = 0;
3919 /* Indexed by enum debug_info_type. */
3920 static const char *const debug_type_names[] =
3922 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3925 /* The maximum admissible debug level value. */
3926 static const unsigned max_debug_level = 3;
3928 /* Look up ARG in the table. */
3929 for (da = debug_args; da->arg; da++)
3931 const int da_len = strlen (da->arg);
3933 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3935 enum debug_info_type type = da->debug_type;
3936 const char *p = arg + da_len;
3938 if (*p && ! ISDIGIT (*p))
3941 /* A debug flag without a level defaults to level 2.
3942 Note we do not want to call read_integral_parameter
3943 for that case since it will call atoi which
3946 ??? We may want to generalize the interface to
3947 read_integral_parameter to better handle this case
3948 if this case shows up often. */
3950 level = read_integral_parameter (p, 0, max_debug_level + 1);
3952 level = (level == 0) ? 2 : level;
3954 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
3956 error ("use -gdwarf -g%d for DWARF v1, level %d",
3959 error ("use -gdwarf-2 for DWARF v2");
3962 if (level > max_debug_level)
3965 ignoring option `%s' due to invalid debug level specification",
3967 level = debug_info_level;
3970 if (type == NO_DEBUG)
3972 type = PREFERRED_DEBUGGING_TYPE;
3974 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
3976 #ifdef DWARF2_DEBUGGING_INFO
3977 type = DWARF2_DEBUG;
3979 #ifdef DBX_DEBUGGING_INFO
3986 if (type == NO_DEBUG)
3987 warning ("`%s': unknown or unsupported -g option", arg - 2);
3989 /* Does it conflict with an already selected type? */
3990 if (type_explicitly_set_p
3991 /* -g/-ggdb don't conflict with anything. */
3992 && da->debug_type != NO_DEBUG
3993 && type != selected_debug_type)
3994 warning ("`%s' ignored, conflicts with `-g%s'",
3995 arg - 2, debug_type_names[(int) selected_debug_type]);
3998 /* If the format has already been set, -g/-ggdb
3999 only change the debug level. */
4000 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4001 /* Don't change debugging type. */
4005 selected_debug_type = type;
4006 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4009 write_symbols = (level == 0
4011 : selected_debug_type);
4012 use_gnu_debug_info_extensions = da->use_extensions_p;
4013 debug_info_level = (enum debug_info_level) level;
4026 /* Decode the first argument in the argv as a language-independent option.
4027 Return the number of strings consumed. */
4030 independent_decode_option (argc, argv)
4034 char *arg = argv[0];
4036 if (arg[0] != '-' || arg[1] == 0)
4048 if (!strcmp (arg, "-help"))
4051 exit_after_options = 1;
4054 if (!strcmp (arg, "-target-help"))
4056 display_target_options ();
4057 exit_after_options = 1;
4060 if (!strcmp (arg, "-version"))
4062 print_version (stderr, "");
4063 exit_after_options = 1;
4066 /* Handle '--param <name>=<value>'. */
4067 if (strcmp (arg, "-param") == 0)
4073 error ("-param option missing argument");
4077 /* Get the '<name>=<value>' parameter. */
4079 /* Look for the `='. */
4080 equal = strchr (arg, '=');
4082 error ("invalid --param option: %s", arg);
4087 /* Zero out the `=' sign so that we get two separate strings. */
4089 /* Figure out what value is specified. */
4090 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4091 if (val != INVALID_PARAM_VAL)
4092 set_param_value (arg, val);
4094 error ("invalid parameter value `%s'", equal + 1);
4109 /* Already been treated in main (). Do nothing. */
4113 set_target_switch (arg + 1);
4117 return decode_f_option (arg + 1);
4120 return decode_g_option (arg + 1);
4123 if (!strcmp (arg, "dumpbase"))
4128 dump_base_name = argv[1];
4132 decode_d_option (arg + 1);
4136 if (!strcmp (arg, "pedantic"))
4138 else if (!strcmp (arg, "pedantic-errors"))
4139 flag_pedantic_errors = pedantic = 1;
4140 else if (arg[1] == 0)
4147 if (!strcmp (arg, "quiet"))
4154 if (!strcmp (arg, "version"))
4162 inhibit_warnings = 1;
4171 /* We save the value of warn_uninitialized, since if they put
4172 -Wuninitialized on the command line, we need to generate a
4173 warning about not using it without also specifying -O. */
4174 if (warn_uninitialized != 1)
4175 warn_uninitialized = 2;
4178 return decode_W_option (arg + 1);
4182 if (!strncmp (arg, "aux-info", 8))
4189 aux_info_file_name = argv[1];
4190 flag_gen_aux_info = 1;
4193 else if (arg[8] == '=')
4195 aux_info_file_name = arg + 9;
4196 flag_gen_aux_info = 1;
4211 asm_file_name = argv[1];
4226 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4231 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4235 if (g_switch_val == -1)
4239 g_switch_set = TRUE;
4240 g_switch_value = g_switch_val;
4250 /* Decode -m switches. */
4251 /* Decode the switch -mNAME. */
4254 set_target_switch (name)
4258 int valid_target_option = 0;
4260 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4261 if (!strcmp (target_switches[j].name, name))
4263 if (target_switches[j].value < 0)
4264 target_flags &= ~-target_switches[j].value;
4266 target_flags |= target_switches[j].value;
4267 valid_target_option = 1;
4270 #ifdef TARGET_OPTIONS
4271 if (!valid_target_option)
4272 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4274 int len = strlen (target_options[j].prefix);
4275 if (!strncmp (target_options[j].prefix, name, len))
4277 *target_options[j].variable = name + len;
4278 valid_target_option = 1;
4283 if (!valid_target_option)
4284 error ("invalid option `%s'", name);
4287 /* Print version information to FILE.
4288 Each line begins with INDENT (for the case where FILE is the
4289 assembler output file). */
4292 print_version (file, indent)
4297 #define __VERSION__ "[?]"
4301 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4303 "%s%s%s version %s (%s) compiled by CC.\n"
4305 , indent, *indent != 0 ? " " : "",
4306 lang_hooks.name, version_string, TARGET_NAME,
4307 indent, __VERSION__);
4310 /* Print an option value and return the adjusted position in the line.
4311 ??? We don't handle error returns from fprintf (disk full); presumably
4312 other code will catch a disk full though. */
4315 print_single_switch (file, pos, max, indent, sep, term, type, name)
4318 const char *indent, *sep, *term, *type, *name;
4320 /* The ultrix fprintf returns 0 on success, so compute the result we want
4321 here since we need it for the following test. */
4322 int len = strlen (sep) + strlen (type) + strlen (name);
4327 fprintf (file, "%s", term);
4332 fprintf (file, "%s", indent);
4333 pos = strlen (indent);
4335 fprintf (file, "%s%s%s", sep, type, name);
4340 /* Print active target switches to FILE.
4341 POS is the current cursor position and MAX is the size of a "line".
4342 Each line begins with INDENT and ends with TERM.
4343 Each switch is separated from the next by SEP. */
4346 print_switch_values (file, pos, max, indent, sep, term)
4349 const char *indent, *sep, *term;
4354 /* Print the options as passed. */
4356 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4357 _("options passed: "), "");
4359 for (p = &save_argv[1]; *p != NULL; p++)
4363 if (strcmp (*p, "-o") == 0)
4369 if (strcmp (*p, "-quiet") == 0)
4371 if (strcmp (*p, "-version") == 0)
4376 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4379 fprintf (file, "%s", term);
4381 /* Print the -f and -m options that have been enabled.
4382 We don't handle language specific options but printing argv
4385 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4386 _("options enabled: "), "");
4388 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4389 if (*f_options[j].variable == f_options[j].on_value)
4390 pos = print_single_switch (file, pos, max, indent, sep, term,
4391 "-f", f_options[j].string);
4393 /* Print target specific options. */
4395 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4396 if (target_switches[j].name[0] != '\0'
4397 && target_switches[j].value > 0
4398 && ((target_switches[j].value & target_flags)
4399 == target_switches[j].value))
4401 pos = print_single_switch (file, pos, max, indent, sep, term,
4402 "-m", target_switches[j].name);
4405 #ifdef TARGET_OPTIONS
4406 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4407 if (*target_options[j].variable != NULL)
4410 sprintf (prefix, "-m%s", target_options[j].prefix);
4411 pos = print_single_switch (file, pos, max, indent, sep, term,
4412 prefix, *target_options[j].variable);
4416 fprintf (file, "%s", term);
4419 /* Open assembly code output file. Do this even if -fsyntax-only is
4420 on, because then the driver will have provided the name of a
4421 temporary file or bit bucket for us. NAME is the file specified on
4422 the command line, possibly NULL. */
4424 init_asm_output (name)
4427 if (name == NULL && asm_file_name == 0)
4428 asm_out_file = stdout;
4431 if (asm_file_name == 0)
4433 int len = strlen (dump_base_name);
4434 char *dumpname = (char *) xmalloc (len + 6);
4435 memcpy (dumpname, dump_base_name, len + 1);
4436 strip_off_ending (dumpname, len);
4437 strcat (dumpname, ".s");
4438 asm_file_name = dumpname;
4440 if (!strcmp (asm_file_name, "-"))
4441 asm_out_file = stdout;
4443 asm_out_file = fopen (asm_file_name, "w");
4444 if (asm_out_file == 0)
4445 fatal_io_error ("can't open %s for writing", asm_file_name);
4448 #ifdef IO_BUFFER_SIZE
4449 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4450 _IOFBF, IO_BUFFER_SIZE);
4453 if (!flag_syntax_only)
4455 #ifdef ASM_FILE_START
4456 ASM_FILE_START (asm_out_file);
4459 #ifdef ASM_COMMENT_START
4460 if (flag_verbose_asm)
4462 /* Print the list of options in effect. */
4463 print_version (asm_out_file, ASM_COMMENT_START);
4464 print_switch_values (asm_out_file, 0, MAX_LINE,
4465 ASM_COMMENT_START, " ", "\n");
4466 /* Add a blank line here so it appears in assembler output but not
4468 fprintf (asm_out_file, "\n");
4474 /* Initialization of the front end environment, before command line
4475 options are parsed. Signal handlers, internationalization etc.
4476 ARGV0 is main's argv[0]. */
4478 general_init (argv0)
4483 p = argv0 + strlen (argv0);
4484 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4488 xmalloc_set_program_name (progname);
4490 gcc_init_libintl ();
4492 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4494 signal (SIGSEGV, crash_signal);
4497 signal (SIGILL, crash_signal);
4500 signal (SIGBUS, crash_signal);
4503 signal (SIGABRT, crash_signal);
4505 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4506 signal (SIGIOT, crash_signal);
4509 signal (SIGFPE, crash_signal);
4512 /* Initialize the diagnostics reporting machinery, so option parsing
4513 can give warnings and errors. */
4514 diagnostic_initialize (global_dc);
4517 /* Parse command line options and set default flag values, called
4518 after language-independent option-independent initialization. Do
4519 minimal options processing. Outputting diagnostics is OK, but GC
4520 and identifier hashtables etc. are not initialized yet. */
4522 parse_options_and_default_flags (argc, argv)
4528 /* Save in case md file wants to emit args as a comment. */
4532 /* Initialize register usage now so switches may override. */
4535 /* Register the language-independent parameters. */
4536 add_params (lang_independent_params, LAST_PARAM);
4538 /* Perform language-specific options initialization. */
4539 (*lang_hooks.init_options) ();
4541 /* Scan to see what optimization level has been specified. That will
4542 determine the default value of many flags. */
4543 for (i = 1; i < argc; i++)
4545 if (!strcmp (argv[i], "-O"))
4550 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4552 /* Handle -Os, -O2, -O3, -O69, ... */
4553 char *p = &argv[i][2];
4555 if ((p[0] == 's') && (p[1] == 0))
4559 /* Optimizing for size forces optimize to be 2. */
4564 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4565 if (optimize_val != -1)
4567 optimize = optimize_val;
4576 flag_merge_constants = 0;
4582 flag_thread_jumps = 1;
4584 flag_delayed_branch = 1;
4586 #ifdef CAN_DEBUG_WITHOUT_FP
4587 flag_omit_frame_pointer = 1;
4589 flag_guess_branch_prob = 1;
4590 flag_cprop_registers = 1;
4591 flag_loop_optimize = 1;
4592 flag_crossjumping = 1;
4597 flag_optimize_sibling_calls = 1;
4598 flag_cse_follow_jumps = 1;
4599 flag_cse_skip_blocks = 1;
4601 flag_expensive_optimizations = 1;
4602 flag_strength_reduce = 1;
4603 flag_rerun_cse_after_loop = 1;
4604 flag_rerun_loop_opt = 1;
4605 flag_caller_saves = 1;
4608 #ifdef INSN_SCHEDULING
4609 flag_schedule_insns = 1;
4610 flag_schedule_insns_after_reload = 1;
4613 flag_strict_aliasing = 1;
4614 flag_delete_null_pointer_checks = 1;
4615 flag_reorder_blocks = 1;
4620 flag_inline_functions = 1;
4621 flag_rename_registers = 1;
4624 if (optimize < 2 || optimize_size)
4629 align_functions = 1;
4632 /* Initialize whether `char' is signed. */
4633 flag_signed_char = DEFAULT_SIGNED_CHAR;
4634 #ifdef DEFAULT_SHORT_ENUMS
4635 /* Initialize how much space enums occupy, by default. */
4636 flag_short_enums = DEFAULT_SHORT_ENUMS;
4639 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4642 set_target_switch ("");
4644 /* Unwind tables are always present in an ABI-conformant IA-64
4645 object file, so the default should be ON. */
4646 #ifdef IA64_UNWIND_INFO
4647 flag_unwind_tables = IA64_UNWIND_INFO;
4650 #ifdef OPTIMIZATION_OPTIONS
4651 /* Allow default optimizations to be specified on a per-machine basis. */
4652 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4655 /* Perform normal command line switch decoding. */
4656 for (i = 1; i < argc;)
4659 int indep_processed;
4661 /* Give the language a chance to decode the option for itself. */
4662 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4664 if (lang_processed >= 0)
4665 /* Now see if the option also has a language independent meaning.
4666 Some options are both language specific and language independent,
4668 indep_processed = independent_decode_option (argc - i, argv + i);
4671 lang_processed = -lang_processed;
4672 indep_processed = 0;
4675 if (lang_processed || indep_processed)
4676 i += MAX (lang_processed, indep_processed);
4679 const char *option = NULL;
4680 const char *lang = NULL;
4683 /* It is possible that the command line switch is not valid for the
4684 current language, but it is valid for another language. In order
4685 to be compatible with previous versions of the compiler (which
4686 did not issue an error message in this case) we check for this
4687 possibility here. If we do find a match, then if extra_warnings
4688 is set we generate a warning message, otherwise we will just
4689 ignore the option. */
4690 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4692 option = documented_lang_options[j].option;
4695 lang = documented_lang_options[j].description;
4696 else if (! strncmp (argv[i], option, strlen (option)))
4700 if (j != ARRAY_SIZE (documented_lang_options))
4704 warning ("ignoring command line option '%s'", argv[i]);
4707 ("(it is valid for %s but not the selected language)",
4711 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4712 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4714 error ("unrecognized option `%s'", argv[i]);
4720 if (flag_no_inline == 2)
4723 flag_really_no_inline = flag_no_inline;
4725 /* Set flag_no_inline before the post_options () hook. The C front
4726 ends use it to determine tree inlining defaults. FIXME: such
4727 code should be lang-independent when all front ends use tree
4728 inlining, in which case it, and this condition, should be moved
4729 to the top of process_options() instead. */
4732 /* Inlining does not work if not optimizing,
4733 so force it not to be done. */
4737 /* The c_decode_option function and decode_option hook set
4738 this to `2' if -Wall is used, so we can avoid giving out
4739 lots of errors for people who don't realize what -Wall does. */
4740 if (warn_uninitialized == 1)
4741 warning ("-Wuninitialized is not supported without -O");
4744 if (flag_really_no_inline == 2)
4745 flag_really_no_inline = flag_no_inline;
4747 /* All command line options have been parsed; allow the front end to
4748 perform consistency checks, etc. */
4749 (*lang_hooks.post_options) ();
4752 /* Process the options that have been parsed. */
4756 #ifdef OVERRIDE_OPTIONS
4757 /* Some machines may reject certain combinations of options. */
4761 /* Set up the align_*_log variables, defaulting them to 1 if they
4762 were still unset. */
4763 if (align_loops <= 0) align_loops = 1;
4764 if (align_loops_max_skip > align_loops || !align_loops)
4765 align_loops_max_skip = align_loops - 1;
4766 align_loops_log = floor_log2 (align_loops * 2 - 1);
4767 if (align_jumps <= 0) align_jumps = 1;
4768 if (align_jumps_max_skip > align_jumps || !align_jumps)
4769 align_jumps_max_skip = align_jumps - 1;
4770 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4771 if (align_labels <= 0) align_labels = 1;
4772 align_labels_log = floor_log2 (align_labels * 2 - 1);
4773 if (align_labels_max_skip > align_labels || !align_labels)
4774 align_labels_max_skip = align_labels - 1;
4775 if (align_functions <= 0) align_functions = 1;
4776 align_functions_log = floor_log2 (align_functions * 2 - 1);
4778 /* Unrolling all loops implies that standard loop unrolling must also
4780 if (flag_unroll_all_loops)
4781 flag_unroll_loops = 1;
4782 /* Loop unrolling requires that strength_reduction be on also. Silently
4783 turn on strength reduction here if it isn't already on. Also, the loop
4784 unrolling code assumes that cse will be run after loop, so that must
4785 be turned on also. */
4786 if (flag_unroll_loops)
4788 flag_strength_reduce = 1;
4789 flag_rerun_cse_after_loop = 1;
4792 if (flag_non_call_exceptions)
4793 flag_asynchronous_unwind_tables = 1;
4794 if (flag_asynchronous_unwind_tables)
4795 flag_unwind_tables = 1;
4797 /* Warn about options that are not supported on this machine. */
4798 #ifndef INSN_SCHEDULING
4799 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4800 warning ("instruction scheduling not supported on this target machine");
4803 if (flag_delayed_branch)
4804 warning ("this target machine does not have delayed branches");
4807 /* Some operating systems do not allow profiling without a frame
4809 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4811 && flag_omit_frame_pointer)
4813 error ("profiling does not work without a frame pointer");
4814 flag_omit_frame_pointer = 0;
4817 user_label_prefix = USER_LABEL_PREFIX;
4818 if (flag_leading_underscore != -1)
4820 /* If the default prefix is more complicated than "" or "_",
4821 issue a warning and ignore this option. */
4822 if (user_label_prefix[0] == 0 ||
4823 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4825 user_label_prefix = flag_leading_underscore ? "_" : "";
4828 warning ("-f%sleading-underscore not supported on this target machine",
4829 flag_leading_underscore ? "" : "no-");
4832 /* If we are in verbose mode, write out the version and maybe all the
4833 option flags in use. */
4836 print_version (stderr, "");
4838 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4844 if (flag_syntax_only)
4846 write_symbols = NO_DEBUG;
4850 /* Now we know write_symbols, set up the debug hooks based on it.
4851 By default we do nothing for debug output. */
4852 #if defined(DBX_DEBUGGING_INFO)
4853 if (write_symbols == DBX_DEBUG)
4854 debug_hooks = &dbx_debug_hooks;
4856 #if defined(XCOFF_DEBUGGING_INFO)
4857 if (write_symbols == XCOFF_DEBUG)
4858 debug_hooks = &xcoff_debug_hooks;
4860 #ifdef SDB_DEBUGGING_INFO
4861 if (write_symbols == SDB_DEBUG)
4862 debug_hooks = &sdb_debug_hooks;
4864 #ifdef DWARF_DEBUGGING_INFO
4865 if (write_symbols == DWARF_DEBUG)
4866 debug_hooks = &dwarf_debug_hooks;
4868 #ifdef DWARF2_DEBUGGING_INFO
4869 if (write_symbols == DWARF2_DEBUG)
4870 debug_hooks = &dwarf2_debug_hooks;
4872 #ifdef VMS_DEBUGGING_INFO
4873 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4874 debug_hooks = &vmsdbg_debug_hooks;
4877 /* If auxiliary info generation is desired, open the output file.
4878 This goes in the same directory as the source file--unlike
4879 all the other output files. */
4880 if (flag_gen_aux_info)
4882 aux_info_file = fopen (aux_info_file_name, "w");
4883 if (aux_info_file == 0)
4884 fatal_io_error ("can't open %s", aux_info_file_name);
4887 if (! targetm.have_named_sections)
4889 if (flag_function_sections)
4891 warning ("-ffunction-sections not supported for this target");
4892 flag_function_sections = 0;
4894 if (flag_data_sections)
4896 warning ("-fdata-sections not supported for this target");
4897 flag_data_sections = 0;
4901 if (flag_function_sections && profile_flag)
4903 warning ("-ffunction-sections disabled; it makes profiling impossible");
4904 flag_function_sections = 0;
4907 #ifndef HAVE_prefetch
4908 if (flag_prefetch_loop_arrays)
4910 warning ("-fprefetch-loop-arrays not supported for this target");
4911 flag_prefetch_loop_arrays = 0;
4914 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4916 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4917 flag_prefetch_loop_arrays = 0;
4921 /* This combination of options isn't handled for i386 targets and doesn't
4922 make much sense anyway, so don't allow it. */
4923 if (flag_prefetch_loop_arrays && optimize_size)
4925 warning ("-fprefetch-loop-arrays is not supported with -Os");
4926 flag_prefetch_loop_arrays = 0;
4929 #ifndef OBJECT_FORMAT_ELF
4930 if (flag_function_sections && write_symbols != NO_DEBUG)
4931 warning ("-ffunction-sections may affect debugging on some targets");
4935 /* Language-independent initialization, before language-dependent
4938 lang_independent_init ()
4940 /* Initialize the garbage-collector, and string pools. */
4942 ggc_add_rtx_root (&stack_limit_rtx, 1);
4943 ggc_add_tree_root (¤t_function_decl, 1);
4944 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4949 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4950 || debug_info_level == DINFO_LEVEL_VERBOSE
4951 #ifdef VMS_DEBUGGING_INFO
4952 /* Enable line number info for traceback */
4953 || debug_info_level > DINFO_LEVEL_NONE
4955 || flag_test_coverage
4956 || warn_notreached);
4962 init_function_once ();
4963 init_stor_layout_once ();
4964 init_varasm_once ();
4965 init_EXPR_INSN_LIST_cache ();
4967 /* The following initialization functions need to generate rtl, so
4968 provide a dummy function context for them. */
4969 init_dummy_function_start ();
4972 if (flag_caller_saves)
4973 init_caller_save ();
4974 expand_dummy_function_end ();
4977 /* Language-dependent initialization. Returns non-zero on success. */
4979 lang_dependent_init (name)
4982 if (dump_base_name == 0)
4983 dump_base_name = name ? name : "gccdump";
4985 /* Front-end initialization. This hook can assume that GC,
4986 identifier hashes etc. are set up, but debug initialization is
4987 not done yet. This routine must return the original filename
4988 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
4989 name = (*lang_hooks.init) (name);
4993 /* Is this duplication necessary? */
4994 name = ggc_strdup (name);
4995 main_input_filename = input_filename = name;
4996 init_asm_output (name);
4998 /* These create various _DECL nodes, so need to be called after the
4999 front end is initialized. */
5003 /* Put an entry on the input file stack for the main input file. */
5004 push_srcloc (input_filename, 0);
5006 /* If dbx symbol table desired, initialize writing it and output the
5007 predefined types. */
5008 timevar_push (TV_SYMOUT);
5010 #ifdef DWARF2_UNWIND_INFO
5011 if (dwarf2out_do_frame ())
5012 dwarf2out_frame_init ();
5015 /* Now we have the correct original filename, we can initialize
5017 (*debug_hooks->init) (name);
5019 timevar_pop (TV_SYMOUT);
5024 /* Clean up: close opened files, etc. */
5029 /* Close the dump files. */
5030 if (flag_gen_aux_info)
5032 fclose (aux_info_file);
5034 unlink (aux_info_file_name);
5037 /* Close non-debugging input and output files. Take special care to note
5038 whether fclose returns an error, since the pages might still be on the
5039 buffer chain while the file is open. */
5043 if (ferror (asm_out_file) != 0)
5044 fatal_io_error ("error writing to %s", asm_file_name);
5045 if (fclose (asm_out_file) != 0)
5046 fatal_io_error ("error closing %s", asm_file_name);
5049 /* Do whatever is necessary to finish printing the graphs. */
5050 if (graph_dump_format != no_graph)
5054 for (i = 0; i < (int) DFI_MAX; ++i)
5055 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5060 sprintf (seq, DUMPFILE_FORMAT, i);
5061 suffix = concat (seq, dump_file[i].extension, NULL);
5062 finish_graph_dump_file (dump_base_name, suffix);
5069 ggc_print_statistics ();
5070 stringpool_statistics ();
5071 dump_tree_statistics ();
5074 /* Free up memory for the benefit of leak detectors. */
5077 /* Language-specific end of compilation actions. */
5078 (*lang_hooks.finish) ();
5081 /* Initialize the compiler, and compile the input file. */
5085 /* The bulk of command line switch processing. */
5088 /* We cannot start timing until after options are processed since that
5089 says if we run timers or not. */
5091 timevar_start (TV_TOTAL);
5093 /* Language-independent initialization. Also sets up GC, identifier
5095 lang_independent_init ();
5097 /* Language-dependent initialization. Returns true on success. */
5098 if (lang_dependent_init (filename))
5103 /* Stop timing and print the times. */
5104 timevar_stop (TV_TOTAL);
5105 timevar_print (stderr);
5108 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5109 Decode command args, then call compile_file.
5110 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5111 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5113 It is not safe to call this function more than once. */
5116 toplev_main (argc, argv)
5122 /* Initialization of GCC's environment, and diagnostics. */
5123 general_init (argv [0]);
5125 /* Parse the options and do minimal processing; basically just
5126 enough to default flags appropriately. */
5127 parse_options_and_default_flags (argc, argv);
5129 /* Exit early if we can (e.g. -help). */
5130 if (!exit_after_options)
5133 if (errorcount || sorrycount)
5134 return (FATAL_EXIT_CODE);
5136 return (SUCCESS_EXIT_CODE);