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 /* Nonzero to dump debug info whilst parsing (-dy option). */
130 static int set_yydebug;
132 /* Length of line when printing switch values. */
135 /* Name of program invoked, sans directories. */
137 const char *progname;
139 /* Copy of arguments to toplev_main. */
143 /* Name of current original source file (what was input to cpp).
144 This comes from each #-command in the actual input. */
146 const char *input_filename;
148 /* Name of top-level original source file (what was input to cpp).
149 This comes from the #-command at the beginning of the actual input.
150 If there isn't any there, then this is the cc1 input file name. */
152 const char *main_input_filename;
154 /* Current line number in real source file. */
158 /* Nonzero if it is unsafe to create any new pseudo registers. */
161 /* Stack of currently pending input files. */
163 struct file_stack *input_file_stack;
165 /* Incremented on each change to input_file_stack. */
166 int input_file_stack_tick;
168 /* Name to use as base of names for dump output files. */
170 const char *dump_base_name;
172 /* Format to use to print dumpfile index value */
173 #ifndef DUMPFILE_FORMAT
174 #define DUMPFILE_FORMAT ".%02d."
177 /* Bit flags that specify the machine subtype we are compiling for.
178 Bits are tested using macros TARGET_... defined in the tm.h file
179 and set by `-m...' switches. Must be defined in rtlanal.c. */
181 extern int target_flags;
183 /* Debug hooks - dependent upon command line options. */
185 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
187 /* Describes a dump file. */
189 struct dump_file_info
191 /* The unique extension to apply, e.g. ".jump". */
192 const char *const extension;
194 /* The -d<c> character that enables this dump file. */
195 char const debug_switch;
197 /* True if there is a corresponding graph dump file. */
198 char const graph_dump_p;
200 /* True if the user selected this dump. */
203 /* True if the files have been initialized (ie truncated). */
207 /* Enumerate the extant dump files. */
247 /* Describes all the dump files. Should be kept in order of the
248 pass and in sync with dump_file_index above.
250 Remaining -d letters:
256 static struct dump_file_info dump_file[DFI_MAX] =
258 { "rtl", 'r', 0, 0, 0 },
259 { "sibling", 'i', 0, 0, 0 },
260 { "eh", 'h', 0, 0, 0 },
261 { "jump", 'j', 0, 0, 0 },
262 { "ssa", 'e', 1, 0, 0 },
263 { "ssaccp", 'W', 1, 0, 0 },
264 { "ssadce", 'X', 1, 0, 0 },
265 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
266 { "null", 'u', 0, 0, 0 },
267 { "cse", 's', 0, 0, 0 },
268 { "addressof", 'F', 0, 0, 0 },
269 { "gcse", 'G', 1, 0, 0 },
270 { "loop", 'L', 1, 0, 0 },
271 { "cfg", 'f', 1, 0, 0 },
272 { "bp", 'b', 1, 0, 0 },
273 { "cse2", 't', 1, 0, 0 },
274 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
275 { "combine", 'c', 1, 0, 0 },
276 { "ce", 'C', 1, 0, 0 },
277 { "regmove", 'N', 1, 0, 0 },
278 { "sched", 'S', 1, 0, 0 },
279 { "lreg", 'l', 1, 0, 0 },
280 { "greg", 'g', 1, 0, 0 },
281 { "postreload", 'o', 1, 0, 0 },
282 { "flow2", 'w', 1, 0, 0 },
283 { "peephole2", 'z', 1, 0, 0 },
284 { "rnreg", 'n', 1, 0, 0 },
285 { "ce2", 'E', 1, 0, 0 },
286 { "sched2", 'R', 1, 0, 0 },
287 { "stack", 'k', 1, 0, 0 },
288 { "bbro", 'B', 1, 0, 0 },
289 { "mach", 'M', 1, 0, 0 },
290 { "dbr", 'd', 0, 0, 0 },
293 static int open_dump_file PARAMS ((enum dump_file_index, tree));
294 static void close_dump_file PARAMS ((enum dump_file_index,
295 void (*) (FILE *, rtx), rtx));
297 /* Other flags saying which kinds of debugging dump have been requested. */
299 int rtl_dump_and_exit;
300 int flag_print_asm_name;
301 static int version_flag;
302 static char *filename;
303 enum graph_dump_types graph_dump_format;
305 /* Name for output file of assembly code, specified with -o. */
309 /* Value of the -G xx switch, and whether it was passed or not. */
313 /* Type(s) of debugging information we are producing (if any).
314 See flags.h for the definitions of the different possible
315 types of debugging information. */
316 enum debug_info_type write_symbols = NO_DEBUG;
318 /* Level of debugging information we are producing. See flags.h
319 for the definitions of the different possible levels. */
320 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
322 /* Nonzero means use GNU-only extensions in the generated symbolic
323 debugging information. */
324 /* Currently, this only has an effect when write_symbols is set to
325 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
326 int use_gnu_debug_info_extensions = 0;
328 /* Nonzero means do optimizations. -O.
329 Particular numeric values stand for particular amounts of optimization;
330 thus, -O2 stores 2 here. However, the optimizations beyond the basic
331 ones are not controlled directly by this variable. Instead, they are
332 controlled by individual `flag_...' variables that are defaulted
333 based on this variable. */
337 /* Nonzero means optimize for size. -Os.
338 The only valid values are zero and non-zero. When optimize_size is
339 non-zero, optimize defaults to 2, but certain individual code
340 bloating optimizations are disabled. */
342 int optimize_size = 0;
344 /* Nonzero if we should exit after parsing options. */
345 static int exit_after_options = 0;
347 /* The FUNCTION_DECL for the function currently being compiled,
348 or 0 if between functions. */
349 tree current_function_decl;
351 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
353 tree current_function_func_begin_label;
355 /* Nonzero if doing dwarf2 duplicate elimination. */
357 int flag_eliminate_dwarf2_dups = 0;
359 /* Nonzero if generating code to do profiling. */
361 int profile_flag = 0;
363 /* Nonzero if generating code to profile program flow graph arcs. */
365 int profile_arc_flag = 0;
367 /* Nonzero if generating info for gcov to calculate line test coverage. */
369 int flag_test_coverage = 0;
371 /* Nonzero indicates that branch taken probabilities should be calculated. */
373 int flag_branch_probabilities = 0;
375 /* Nonzero if basic blocks should be reordered. */
377 int flag_reorder_blocks = 0;
379 /* Nonzero if registers should be renamed. */
381 int flag_rename_registers = 0;
382 int flag_cprop_registers = 0;
384 /* Nonzero for -pedantic switch: warn about anything
385 that standard spec forbids. */
389 /* Temporarily suppress certain warnings.
390 This is set while reading code from a system header file. */
392 int in_system_header = 0;
394 /* Don't print functions as they are compiled. -quiet. */
398 /* Print times taken by the various passes. -ftime-report. */
402 /* Print memory still in use at end of compilation (which may have little
403 to do with peak memory consumption). -fmem-report. */
407 /* Non-zero means to collect statistics which might be expensive
408 and to print them when we are done. */
409 int flag_detailed_statistics = 0;
414 /* Nonzero means `char' should be signed. */
416 int flag_signed_char;
418 /* Nonzero means give an enum type only as many bytes as it needs. */
420 int flag_short_enums;
422 /* Nonzero for -fcaller-saves: allocate values in regs that need to
423 be saved across function calls, if that produces overall better code.
424 Optional now, so people can test it. */
426 #ifdef DEFAULT_CALLER_SAVES
427 int flag_caller_saves = 1;
429 int flag_caller_saves = 0;
432 /* Nonzero if structures and unions should be returned in memory.
434 This should only be defined if compatibility with another compiler or
435 with an ABI is needed, because it results in slower code. */
437 #ifndef DEFAULT_PCC_STRUCT_RETURN
438 #define DEFAULT_PCC_STRUCT_RETURN 1
441 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
443 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
445 /* Nonzero for -fforce-mem: load memory value into a register
446 before arithmetic on it. This makes better cse but slower compilation. */
448 int flag_force_mem = 0;
450 /* Nonzero for -fforce-addr: load memory address into a register before
451 reference to memory. This makes better cse but slower compilation. */
453 int flag_force_addr = 0;
455 /* Nonzero for -fdefer-pop: don't pop args after each function call;
456 instead save them up to pop many calls' args with one insns. */
458 int flag_defer_pop = 0;
460 /* Nonzero for -ffloat-store: don't allocate floats and doubles
461 in extended-precision registers. */
463 int flag_float_store = 0;
465 /* Nonzero for -fcse-follow-jumps:
466 have cse follow jumps to do a more extensive job. */
468 int flag_cse_follow_jumps;
470 /* Nonzero for -fcse-skip-blocks:
471 have cse follow a branch around a block. */
472 int flag_cse_skip_blocks;
474 /* Nonzero for -fexpensive-optimizations:
475 perform miscellaneous relatively-expensive optimizations. */
476 int flag_expensive_optimizations;
478 /* Nonzero for -fthread-jumps:
479 have jump optimize output of loop. */
481 int flag_thread_jumps;
483 /* Nonzero enables strength-reduction in loop.c. */
485 int flag_strength_reduce = 0;
487 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
488 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
489 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
492 int flag_unroll_loops;
494 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
495 This is generally not a win. */
497 int flag_unroll_all_loops;
499 /* Nonzero enables prefetch optimizations for arrays in loops. */
501 int flag_prefetch_loop_arrays;
503 /* Nonzero forces all invariant computations in loops to be moved
506 int flag_move_all_movables = 0;
508 /* Nonzero forces all general induction variables in loops to be
511 int flag_reduce_all_givs = 0;
513 /* Nonzero to perform full register move optimization passes. This is the
516 int flag_regmove = 0;
518 /* Nonzero for -fwritable-strings:
519 store string constants in data segment and don't uniquize them. */
521 int flag_writable_strings = 0;
523 /* Nonzero means don't put addresses of constant functions in registers.
524 Used for compiling the Unix kernel, where strange substitutions are
525 done on the assembly output. */
527 int flag_no_function_cse = 0;
529 /* Nonzero for -fomit-frame-pointer:
530 don't make a frame pointer in simple functions that don't require one. */
532 int flag_omit_frame_pointer = 0;
534 /* Nonzero means place each function into its own section on those platforms
535 which support arbitrary section names and unlimited numbers of sections. */
537 int flag_function_sections = 0;
539 /* ... and similar for data. */
541 int flag_data_sections = 0;
543 /* Nonzero to inhibit use of define_optimization peephole opts. */
545 int flag_no_peephole = 0;
547 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
549 int flag_optimize_sibling_calls = 0;
551 /* Nonzero means the front end generally wants `errno' maintained by math
552 operations, like built-in SQRT. */
554 int flag_errno_math = 1;
556 /* Nonzero means that unsafe floating-point math optimizations are allowed
557 for the sake of speed. IEEE compliance is not guaranteed, and operations
558 are allowed to assume that their arguments and results are "normal"
559 (e.g., nonnegative for SQRT). */
561 int flag_unsafe_math_optimizations = 0;
563 /* Zero means that floating-point math operations cannot generate a
564 (user-visible) trap. This is the case, for example, in nonstop
565 IEEE 754 arithmetic. */
567 int flag_trapping_math = 1;
569 /* 0 means straightforward implementation of complex divide acceptable.
570 1 means wide ranges of inputs must work for complex divide.
571 2 means C99-like requirements for complex divide (not yet implemented). */
573 int flag_complex_divide_method = 0;
575 /* Nonzero means all references through pointers are volatile. */
579 /* Nonzero means treat all global and extern variables as volatile. */
581 int flag_volatile_global;
583 /* Nonzero means treat all static variables as volatile. */
585 int flag_volatile_static;
587 /* Nonzero means just do syntax checking; don't output anything. */
589 int flag_syntax_only = 0;
591 /* Nonzero means perform global cse. */
593 static int flag_gcse;
595 /* Nonzero means perform loop optimizer. */
597 static int flag_loop_optimize;
599 /* Nonzero means perform crossjumping. */
601 static int flag_crossjumping;
603 /* Nonzero means perform if conversion. */
605 static int flag_if_conversion;
607 /* Nonzero means perform if conversion after reload. */
609 static int flag_if_conversion2;
611 /* Nonzero means to use global dataflow analysis to eliminate
612 useless null pointer tests. */
614 static int flag_delete_null_pointer_checks;
616 /* Nonzero means to do the enhanced load motion during gcse, which trys
617 to hoist loads by not killing them when a store to the same location
620 int flag_gcse_lm = 1;
622 /* Nonzero means to perform store motion after gcse, which will try to
623 move stores closer to the exit block. Its not very effective without
626 int flag_gcse_sm = 1;
628 /* Nonzero means to rerun cse after loop optimization. This increases
629 compilation time about 20% and picks up a few more common expressions. */
631 static int flag_rerun_cse_after_loop;
633 /* Nonzero means to run loop optimizations twice. */
635 int flag_rerun_loop_opt;
637 /* Nonzero for -finline-functions: ok to inline functions that look like
638 good inline candidates. */
640 int flag_inline_functions;
642 /* Nonzero for -fkeep-inline-functions: even if we make a function
643 go inline everywhere, keep its definition around for debugging
646 int flag_keep_inline_functions;
648 /* Nonzero means that functions will not be inlined. */
650 int flag_no_inline = 2;
652 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
653 not just because the tree inliner turned us off. */
655 int flag_really_no_inline = 2;
657 /* Nonzero means that we should emit static const variables
658 regardless of whether or not optimization is turned on. */
660 int flag_keep_static_consts = 1;
662 /* Nonzero means we should be saving declaration info into a .X file. */
664 int flag_gen_aux_info = 0;
666 /* Specified name of aux-info file. */
668 static char *aux_info_file_name;
670 /* Nonzero means make the text shared if supported. */
672 int flag_shared_data;
674 /* Nonzero means schedule into delayed branch slots if supported. */
676 int flag_delayed_branch;
678 /* Nonzero if we are compiling pure (sharable) code.
679 Value is 1 if we are doing reasonable (i.e. simple
680 offset into offset table) pic. Value is 2 if we can
681 only perform register offsets. */
685 /* Nonzero means generate extra code for exception handling and enable
686 exception handling. */
690 /* Nonzero means generate frame unwind info table when supported. */
692 int flag_unwind_tables = 0;
694 /* Nonzero means generate frame unwind info table exact at each insn boundary */
696 int flag_asynchronous_unwind_tables = 0;
698 /* Nonzero means don't place uninitialized global data in common storage
703 /* Nonzero means change certain warnings into errors.
704 Usually these are warnings about failure to conform to some standard. */
706 int flag_pedantic_errors = 0;
708 /* flag_schedule_insns means schedule insns within basic blocks (before
710 flag_schedule_insns_after_reload means schedule insns after
713 int flag_schedule_insns = 0;
714 int flag_schedule_insns_after_reload = 0;
716 /* The following flags have effect only for scheduling before register
719 flag_schedule_interblock means schedule insns accross basic blocks.
720 flag_schedule_speculative means allow speculative motion of non-load insns.
721 flag_schedule_speculative_load means allow speculative motion of some
723 flag_schedule_speculative_load_dangerous allows speculative motion of more
726 int flag_schedule_interblock = 1;
727 int flag_schedule_speculative = 1;
728 int flag_schedule_speculative_load = 0;
729 int flag_schedule_speculative_load_dangerous = 0;
731 int flag_single_precision_constant;
733 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
734 by a cheaper branch on a count register. */
735 int flag_branch_on_count_reg = 1;
737 /* -finhibit-size-directive inhibits output of .size for ELF.
738 This is used only for compiling crtstuff.c,
739 and it may be extended to other effects
740 needed for crtstuff.c on other systems. */
741 int flag_inhibit_size_directive = 0;
743 /* -fverbose-asm causes extra commentary information to be produced in
744 the generated assembly code (to make it more readable). This option
745 is generally only of use to those who actually need to read the
746 generated assembly code (perhaps while debugging the compiler itself).
747 -fno-verbose-asm, the default, causes the extra information
748 to be omitted and is useful when comparing two assembler files. */
750 int flag_verbose_asm = 0;
752 /* -dA causes debug commentary information to be produced in
753 the generated assembly code (to make it more readable). This option
754 is generally only of use to those who actually need to read the
755 generated assembly code (perhaps while debugging the compiler itself).
756 Currently, this switch is only used by dwarfout.c; however, it is intended
757 to be a catchall for printing debug information in the assembler file. */
759 int flag_debug_asm = 0;
761 /* -dP causes the rtl to be emitted as a comment in assembly. */
763 int flag_dump_rtl_in_asm = 0;
765 /* -fgnu-linker specifies use of the GNU linker for initializations.
766 (Or, more generally, a linker that handles initializations.)
767 -fno-gnu-linker says that collect2 will be used. */
769 int flag_gnu_linker = 0;
771 int flag_gnu_linker = 1;
774 /* Nonzero means put zero initialized data in the bss section. */
775 int flag_zero_initialized_in_bss = 1;
780 /* Enable ssa conditional constant propagation. */
781 int flag_ssa_ccp = 0;
783 /* Enable ssa aggressive dead code elimination. */
784 int flag_ssa_dce = 0;
786 /* Tag all structures with __attribute__(packed). */
787 int flag_pack_struct = 0;
789 /* Emit code to check for stack overflow; also may cause large objects
790 to be allocated dynamically. */
791 int flag_stack_check;
793 /* When non-NULL, indicates that whenever space is allocated on the
794 stack, the resulting stack pointer must not pass this
795 address---that is, for stacks that grow downward, the stack pointer
796 must always be greater than or equal to this address; for stacks
797 that grow upward, the stack pointer must be less than this address.
798 At present, the rtx may be either a REG or a SYMBOL_REF, although
799 the support provided depends on the backend. */
802 /* 0 if pointer arguments may alias each other. True in C.
803 1 if pointer arguments may not alias each other but may alias
805 2 if pointer arguments may not alias each other and may not
806 alias global variables. True in Fortran.
807 This defaults to 0 for C. */
808 int flag_argument_noalias = 0;
810 /* Nonzero if we should do (language-dependent) alias analysis.
811 Typically, this analysis will assume that expressions of certain
812 types do not alias expressions of certain other types. Only used
813 if alias analysis (in general) is enabled. */
814 int flag_strict_aliasing = 0;
816 /* Instrument functions with calls at entry and exit, for profiling. */
817 int flag_instrument_function_entry_exit = 0;
819 /* Nonzero means ignore `#ident' directives. 0 means handle them.
820 On SVR4 targets, it also controls whether or not to emit a
821 string identifying the compiler. */
823 int flag_no_ident = 0;
825 /* This will perform a peephole pass before sched2. */
826 int flag_peephole2 = 0;
828 /* This will try to guess branch probabilities. */
829 int flag_guess_branch_prob = 0;
831 /* -fbounded-pointers causes gcc to compile pointers as composite
832 objects occupying three words: the pointer value, the base address
833 of the referent object, and the address immediately beyond the end
834 of the referent object. The base and extent allow us to perform
835 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
836 int flag_bounded_pointers = 0;
838 /* -fcheck-bounds causes gcc to generate array bounds checks.
839 For C, C++: defaults to value of flag_bounded_pointers.
840 For ObjC: defaults to off.
841 For Java: defaults to on.
842 For Fortran: defaults to off.
843 For CHILL: defaults to off. */
844 int flag_bounds_check = 0;
846 /* This will attempt to merge constant section constants, if 1 only
847 string constants and constants from constant pool, if 2 also constant
849 int flag_merge_constants = 1;
851 /* If one, renumber instruction UIDs to reduce the number of
852 unused UIDs if there are a lot of instructions. If greater than
853 one, unconditionally renumber instruction UIDs. */
854 int flag_renumber_insns = 1;
856 /* Values of the -falign-* flags: how much to align labels in code.
857 0 means `use default', 1 means `don't align'.
858 For each variable, there is an _log variant which is the power
859 of two not less than the variable, for .align output. */
863 int align_loops_max_skip;
866 int align_jumps_max_skip;
868 int align_labels_log;
869 int align_labels_max_skip;
871 int align_functions_log;
873 /* Table of supported debugging formats. */
876 const char *const arg;
877 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
878 constant expression, we use NO_DEBUG in its place. */
879 const enum debug_info_type debug_type;
880 const int use_extensions_p;
881 const char *const description;
885 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
886 N_("Generate debugging info in default format") },
887 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
888 #ifdef DBX_DEBUGGING_INFO
889 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
890 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
892 #ifdef DWARF_DEBUGGING_INFO
893 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
894 { "dwarf+", DWARF_DEBUG, 1,
895 N_("Generate extended DWARF-1 format debug info") },
897 #ifdef DWARF2_DEBUGGING_INFO
898 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
900 #ifdef XCOFF_DEBUGGING_INFO
901 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
902 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
904 #ifdef SDB_DEBUGGING_INFO
905 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
907 #ifdef VMS_DEBUGGING_INFO
908 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
915 const char *const string;
918 const char *const description;
920 lang_independent_options;
924 /* Add or remove a leading underscore from user symbols. */
925 int flag_leading_underscore = -1;
927 /* The user symbol prefix after having resolved same. */
928 const char *user_label_prefix;
930 static const param_info lang_independent_params[] = {
931 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
932 { OPTION, DEFAULT, HELP },
933 #include "params.def"
938 /* A default for same. */
939 #ifndef USER_LABEL_PREFIX
940 #define USER_LABEL_PREFIX ""
943 /* Table of language-independent -f options.
944 STRING is the option name. VARIABLE is the address of the variable.
945 ON_VALUE is the value to store in VARIABLE
946 if `-fSTRING' is seen as an option.
947 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
949 static const lang_independent_options f_options[] =
951 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
952 N_("Perform DWARF2 duplicate elimination") },
953 {"float-store", &flag_float_store, 1,
954 N_("Do not store floats in registers") },
955 {"volatile", &flag_volatile, 1,
956 N_("Consider all mem refs through pointers as volatile") },
957 {"volatile-global", &flag_volatile_global, 1,
958 N_("Consider all mem refs to global data to be volatile") },
959 {"volatile-static", &flag_volatile_static, 1,
960 N_("Consider all mem refs to static data to be volatile") },
961 {"defer-pop", &flag_defer_pop, 1,
962 N_("Defer popping functions args from stack until later") },
963 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
964 N_("When possible do not generate stack frames") },
965 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
966 N_("Optimize sibling and tail recursive calls") },
967 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
968 N_("When running CSE, follow jumps to their targets") },
969 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
970 N_("When running CSE, follow conditional jumps") },
971 {"expensive-optimizations", &flag_expensive_optimizations, 1,
972 N_("Perform a number of minor, expensive optimizations") },
973 {"thread-jumps", &flag_thread_jumps, 1,
974 N_("Perform jump threading optimizations") },
975 {"strength-reduce", &flag_strength_reduce, 1,
976 N_("Perform strength reduction optimizations") },
977 {"unroll-loops", &flag_unroll_loops, 1,
978 N_("Perform loop unrolling when iteration count is known") },
979 {"unroll-all-loops", &flag_unroll_all_loops, 1,
980 N_("Perform loop unrolling for all loops") },
981 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
982 N_("Generate prefetch instructions, if available, for arrays in loops") },
983 {"move-all-movables", &flag_move_all_movables, 1,
984 N_("Force all loop invariant computations out of loops") },
985 {"reduce-all-givs", &flag_reduce_all_givs, 1,
986 N_("Strength reduce all loop general induction variables") },
987 {"writable-strings", &flag_writable_strings, 1,
988 N_("Store strings in writable data section") },
989 {"peephole", &flag_no_peephole, 0,
990 N_("Enable machine specific peephole optimizations") },
991 {"force-mem", &flag_force_mem, 1,
992 N_("Copy memory operands into registers before using") },
993 {"force-addr", &flag_force_addr, 1,
994 N_("Copy memory address constants into regs before using") },
995 {"function-cse", &flag_no_function_cse, 0,
996 N_("Allow function addresses to be held in registers") },
997 {"inline-functions", &flag_inline_functions, 1,
998 N_("Integrate simple functions into their callers") },
999 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1000 N_("Generate code for funcs even if they are fully inlined") },
1001 {"inline", &flag_no_inline, 0,
1002 N_("Pay attention to the 'inline' keyword") },
1003 {"keep-static-consts", &flag_keep_static_consts, 1,
1004 N_("Emit static const variables even if they are not used") },
1005 {"syntax-only", &flag_syntax_only, 1,
1006 N_("Check for syntax errors, then stop") },
1007 {"shared-data", &flag_shared_data, 1,
1008 N_("Mark data as shared rather than private") },
1009 {"caller-saves", &flag_caller_saves, 1,
1010 N_("Enable saving registers around function calls") },
1011 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1012 N_("Return 'short' aggregates in memory, not registers") },
1013 {"reg-struct-return", &flag_pcc_struct_return, 0,
1014 N_("Return 'short' aggregates in registers") },
1015 {"delayed-branch", &flag_delayed_branch, 1,
1016 N_("Attempt to fill delay slots of branch instructions") },
1017 {"gcse", &flag_gcse, 1,
1018 N_("Perform the global common subexpression elimination") },
1019 {"gcse-lm", &flag_gcse_lm, 1,
1020 N_("Perform enhanced load motion during global subexpression elimination") },
1021 {"gcse-sm", &flag_gcse_sm, 1,
1022 N_("Perform store motion after global subexpression elimination") },
1023 {"loop-optimize", &flag_loop_optimize, 1,
1024 N_("Perform the loop optimizations") },
1025 {"crossjumping", &flag_crossjumping, 1,
1026 N_("Perform cross-jumping optimization") },
1027 {"if-conversion", &flag_if_conversion, 1,
1028 N_("Perform conversion of conditional jumps to branchless equivalents") },
1029 {"if-conversion2", &flag_if_conversion2, 1,
1030 N_("Perform conversion of conditional jumps to conditional execution") },
1031 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1032 N_("Run CSE pass after loop optimizations") },
1033 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1034 N_("Run the loop optimizer twice") },
1035 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1036 N_("Delete useless null pointer checks") },
1037 {"schedule-insns", &flag_schedule_insns, 1,
1038 N_("Reschedule instructions before register allocation") },
1039 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1040 N_("Reschedule instructions after register allocation") },
1041 {"sched-interblock",&flag_schedule_interblock, 1,
1042 N_("Enable scheduling across basic blocks") },
1043 {"sched-spec",&flag_schedule_speculative, 1,
1044 N_("Allow speculative motion of non-loads") },
1045 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1046 N_("Allow speculative motion of some loads") },
1047 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1048 N_("Allow speculative motion of more loads") },
1049 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1050 N_("Replace add,compare,branch with branch on count reg") },
1051 {"pic", &flag_pic, 1,
1052 N_("Generate position independent code, if possible") },
1053 {"PIC", &flag_pic, 2, ""},
1054 {"exceptions", &flag_exceptions, 1,
1055 N_("Enable exception handling") },
1056 {"unwind-tables", &flag_unwind_tables, 1,
1057 N_("Just generate unwind tables for exception handling") },
1058 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1059 N_("Generate unwind tables exact at each instruction boundary") },
1060 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1061 N_("Support synchronous non-call exceptions") },
1062 {"profile-arcs", &profile_arc_flag, 1,
1063 N_("Insert arc based program profiling code") },
1064 {"test-coverage", &flag_test_coverage, 1,
1065 N_("Create data files needed by gcov") },
1066 {"branch-probabilities", &flag_branch_probabilities, 1,
1067 N_("Use profiling information for branch probabilities") },
1068 {"reorder-blocks", &flag_reorder_blocks, 1,
1069 N_("Reorder basic blocks to improve code placement") },
1070 {"rename-registers", &flag_rename_registers, 1,
1071 N_("Do the register renaming optimization pass") },
1072 {"cprop-registers", &flag_cprop_registers, 1,
1073 N_("Do the register copy-propagation optimization pass") },
1074 {"common", &flag_no_common, 0,
1075 N_("Do not put uninitialized globals in the common section") },
1076 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1077 N_("Do not generate .size directives") },
1078 {"function-sections", &flag_function_sections, 1,
1079 N_("place each function into its own section") },
1080 {"data-sections", &flag_data_sections, 1,
1081 N_("place data items into their own section") },
1082 {"verbose-asm", &flag_verbose_asm, 1,
1083 N_("Add extra commentry to assembler output") },
1084 {"gnu-linker", &flag_gnu_linker, 1,
1085 N_("Output GNU ld formatted global initializers") },
1086 {"regmove", &flag_regmove, 1,
1087 N_("Enables a register move optimization") },
1088 {"optimize-register-move", &flag_regmove, 1,
1089 N_("Do the full regmove optimization pass") },
1090 {"pack-struct", &flag_pack_struct, 1,
1091 N_("Pack structure members together without holes") },
1092 {"stack-check", &flag_stack_check, 1,
1093 N_("Insert stack checking code into the program") },
1094 {"argument-alias", &flag_argument_noalias, 0,
1095 N_("Specify that arguments may alias each other & globals") },
1096 {"argument-noalias", &flag_argument_noalias, 1,
1097 N_("Assume arguments may alias globals but not each other") },
1098 {"argument-noalias-global", &flag_argument_noalias, 2,
1099 N_("Assume arguments do not alias each other or globals") },
1100 {"strict-aliasing", &flag_strict_aliasing, 1,
1101 N_("Assume strict aliasing rules apply") },
1102 {"align-loops", &align_loops, 0,
1103 N_("Align the start of loops") },
1104 {"align-jumps", &align_jumps, 0,
1105 N_("Align labels which are only reached by jumping") },
1106 {"align-labels", &align_labels, 0,
1107 N_("Align all labels") },
1108 {"align-functions", &align_functions, 0,
1109 N_("Align the start of functions") },
1110 {"merge-constants", &flag_merge_constants, 1,
1111 N_("Attempt to merge identical constants accross compilation units") },
1112 {"merge-all-constants", &flag_merge_constants, 2,
1113 N_("Attempt to merge identical constants and constant variables") },
1114 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1115 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1116 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1117 N_("Instrument function entry/exit with profiling calls") },
1118 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1119 N_("Put zero initialized data in the bss section") },
1120 {"ssa", &flag_ssa, 1,
1121 N_("Enable SSA optimizations") },
1122 {"ssa-ccp", &flag_ssa_ccp, 1,
1123 N_("Enable SSA conditional constant propagation") },
1124 {"ssa-dce", &flag_ssa_dce, 1,
1125 N_("Enable aggressive SSA dead code elimination") },
1126 {"leading-underscore", &flag_leading_underscore, 1,
1127 N_("External symbols have a leading underscore") },
1128 {"ident", &flag_no_ident, 0,
1129 N_("Process #ident directives") },
1130 { "peephole2", &flag_peephole2, 1,
1131 N_("Enables an rtl peephole pass run before sched2") },
1132 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1133 N_("Enables guessing of branch probabilities") },
1134 {"math-errno", &flag_errno_math, 1,
1135 N_("Set errno after built-in math functions") },
1136 {"trapping-math", &flag_trapping_math, 1,
1137 N_("Floating-point operations can trap") },
1138 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1139 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1140 {"bounded-pointers", &flag_bounded_pointers, 1,
1141 N_("Compile pointers as triples: value, base & end") },
1142 {"bounds-check", &flag_bounds_check, 1,
1143 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1144 {"single-precision-constant", &flag_single_precision_constant, 1,
1145 N_("Convert floating point constant to single precision constant") },
1146 {"time-report", &time_report, 1,
1147 N_("Report time taken by each compiler pass at end of run") },
1148 {"mem-report", &mem_report, 1,
1149 N_("Report on permanent memory allocation at end of run") },
1150 { "trapv", &flag_trapv, 1,
1151 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1154 /* Table of language-specific options. */
1156 static const struct lang_opt
1158 const char *const option;
1159 const char *const description;
1161 documented_lang_options[] =
1163 /* In order not to overload the --help output, the convention
1164 used here is to only describe those options which are not
1165 enabled by default. */
1168 N_("Compile just for ISO C89") },
1170 N_("Determine language standard") },
1172 { "-fsigned-bitfields", "" },
1173 { "-funsigned-bitfields",
1174 N_("Make bit-fields by unsigned by default") },
1175 { "-fno-signed-bitfields", "" },
1176 { "-fno-unsigned-bitfields","" },
1178 N_("Make 'char' be signed by default") },
1179 { "-funsigned-char",
1180 N_("Make 'char' be unsigned by default") },
1181 { "-fno-signed-char", "" },
1182 { "-fno-unsigned-char", "" },
1186 N_("Do not recognize the 'asm' keyword") },
1187 { "-fbuiltin", "" },
1189 N_("Do not recognize any built in functions") },
1191 N_("Assume normal C execution environment") },
1192 { "-fno-hosted", "" },
1194 N_("Assume that standard libraries & main might not exist") },
1195 { "-fno-freestanding", "" },
1196 { "-fcond-mismatch",
1197 N_("Allow different types as args of ? operator") },
1198 { "-fno-cond-mismatch", "" },
1199 { "-fdollars-in-identifiers",
1200 N_("Allow the use of $ inside identifiers") },
1201 { "-fno-dollars-in-identifiers", "" },
1202 { "-fpreprocessed", "" },
1203 { "-fno-preprocessed", "" },
1205 N_("Use the same size for double as for float") },
1206 { "-fno-short-double", "" },
1208 N_("Use the smallest fitting integer to hold enums") },
1209 { "-fno-short-enums", "" },
1211 N_("Override the underlying type for wchar_t to `unsigned short'") },
1212 { "-fno-short-wchar", "" },
1215 N_("Enable most warning messages") },
1216 { "-Wbad-function-cast",
1217 N_("Warn about casting functions to incompatible types") },
1218 { "-Wno-bad-function-cast", "" },
1219 { "-Wmissing-format-attribute",
1220 N_("Warn about functions which might be candidates for format attributes") },
1221 { "-Wno-missing-format-attribute", "" },
1223 N_("Warn about casts which discard qualifiers") },
1224 { "-Wno-cast-qual", "" },
1225 { "-Wchar-subscripts",
1226 N_("Warn about subscripts whose type is 'char'") },
1227 { "-Wno-char-subscripts", "" },
1229 N_("Warn if nested comments are detected") },
1230 { "-Wno-comment", "" },
1232 N_("Warn if nested comments are detected") },
1233 { "-Wno-comments", "" },
1235 N_("Warn about possibly confusing type conversions") },
1236 { "-Wno-conversion", "" },
1237 { "-Wdiv-by-zero", "" },
1238 { "-Wno-div-by-zero",
1239 N_("Do not warn about compile-time integer division by zero") },
1241 N_("Warn about testing equality of floating point numbers") },
1242 { "-Wno-float-equal", "" },
1244 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1245 { "-Wno-format", "" },
1246 { "-Wformat-extra-args", "" },
1247 { "-Wno-format-extra-args",
1248 N_("Don't warn about too many arguments to format functions") },
1249 { "-Wformat-nonliteral",
1250 N_("Warn about non-string-literal format strings") },
1251 { "-Wno-format-nonliteral", "" },
1252 { "-Wformat-security",
1253 N_("Warn about possible security problems with format functions") },
1254 { "-Wno-format-security", "" },
1255 { "-Wformat-y2k", "" },
1256 { "-Wno-format-y2k",
1257 N_("Don't warn about strftime formats yielding 2 digit years") },
1258 { "-Wimplicit-function-declaration",
1259 N_("Warn about implicit function declarations") },
1260 { "-Wno-implicit-function-declaration", "" },
1261 { "-Werror-implicit-function-declaration", "" },
1263 N_("Warn when a declaration does not specify a type") },
1264 { "-Wno-implicit-int", "" },
1265 { "-Wimplicit", "" },
1266 { "-Wno-implicit", "" },
1268 N_("Warn about the use of the #import directive") },
1269 { "-Wno-import", "" },
1270 { "-Wlong-long","" },
1272 N_("Do not warn about using 'long long' when -pedantic") },
1274 N_("Warn about suspicious declarations of main") },
1275 { "-Wno-main", "" },
1276 { "-Wmissing-braces",
1277 N_("Warn about possibly missing braces around initializers") },
1278 { "-Wno-missing-braces", "" },
1279 { "-Wmissing-declarations",
1280 N_("Warn about global funcs without previous declarations") },
1281 { "-Wno-missing-declarations", "" },
1282 { "-Wmissing-prototypes",
1283 N_("Warn about global funcs without prototypes") },
1284 { "-Wno-missing-prototypes", "" },
1286 N_("Warn about use of multicharacter literals") },
1287 { "-Wno-multichar", "" },
1288 { "-Wnested-externs",
1289 N_("Warn about externs not at file scope level") },
1290 { "-Wno-nested-externs", "" },
1292 N_("Warn about possible missing parentheses") },
1293 { "-Wno-parentheses", "" },
1294 { "-Wpointer-arith",
1295 N_("Warn about function pointer arithmetic") },
1296 { "-Wno-pointer-arith", "" },
1297 { "-Wredundant-decls",
1298 N_("Warn about multiple declarations of the same object") },
1299 { "-Wno-redundant-decls", "" },
1301 N_("Warn whenever a function's return-type defaults to int") },
1302 { "-Wno-return-type", "" },
1303 { "-Wsequence-point",
1304 N_("Warn about possible violations of sequence point rules") },
1305 { "-Wno-sequence-point", "" },
1307 N_("Warn about signed/unsigned comparisons") },
1308 { "-Wno-sign-compare", "" },
1309 { "-Wstrict-prototypes",
1310 N_("Warn about non-prototyped function decls") },
1311 { "-Wno-strict-prototypes", "" },
1313 N_("Warn about constructs whose meanings change in ISO C") },
1314 { "-Wno-traditional", "" },
1316 N_("Warn when trigraphs are encountered") },
1317 { "-Wno-trigraphs", "" },
1319 { "-Wno-undef", "" },
1320 { "-Wunknown-pragmas",
1321 N_("Warn about unrecognized pragmas") },
1322 { "-Wno-unknown-pragmas", "" },
1323 { "-Wwrite-strings",
1324 N_("Mark strings as 'const char *'") },
1325 { "-Wno-write-strings", "" },
1327 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1329 #include "options.h"
1333 /* Here is a table, controlled by the tm.h file, listing each -m switch
1334 and which bits in `target_switches' it should set or clear.
1335 If VALUE is positive, it is bits to set.
1336 If VALUE is negative, -VALUE is bits to clear.
1337 (The sign bit is not used so there is no confusion.) */
1341 const char *const name;
1343 const char *const description;
1345 target_switches [] = TARGET_SWITCHES;
1347 /* This table is similar, but allows the switch to have a value. */
1349 #ifdef TARGET_OPTIONS
1352 const char *const prefix;
1353 const char **const variable;
1354 const char *const description;
1356 target_options [] = TARGET_OPTIONS;
1359 /* Options controlling warnings. */
1361 /* Don't print warning messages. -w. */
1363 int inhibit_warnings = 0;
1365 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1367 int warn_system_headers = 0;
1369 /* Print various extra warnings. -W. */
1371 int extra_warnings = 0;
1373 /* Treat warnings as errors. -Werror. */
1375 int warnings_are_errors = 0;
1377 /* Nonzero to warn about unused variables, functions et.al. */
1379 int warn_unused_function;
1380 int warn_unused_label;
1381 int warn_unused_parameter;
1382 int warn_unused_variable;
1383 int warn_unused_value;
1385 /* Nonzero to warn about code which is never reached. */
1387 int warn_notreached;
1389 /* Nonzero to warn about variables used before they are initialized. */
1391 int warn_uninitialized;
1393 /* Nonzero means warn about all declarations which shadow others. */
1397 /* Warn if a switch on an enum, that does not have a default case,
1398 fails to have a case for every enum value. */
1402 /* Warn if a switch does not have a default case. */
1404 int warn_switch_default;
1406 /* Warn if a switch on an enum fails to have a case for every enum
1407 value (regardless of the presence or otherwise of a default case). */
1409 int warn_switch_enum;
1411 /* Nonzero means warn about function definitions that default the return type
1412 or that use a null return and have a return-type other than void. */
1414 int warn_return_type;
1416 /* Nonzero means warn about pointer casts that increase the required
1417 alignment of the target type (and might therefore lead to a crash
1418 due to a misaligned access). */
1420 int warn_cast_align;
1422 /* Nonzero means warn about any objects definitions whose size is larger
1423 than N bytes. Also want about function definitions whose returned
1424 values are larger than N bytes. The value N is in `larger_than_size'. */
1426 int warn_larger_than;
1427 HOST_WIDE_INT larger_than_size;
1429 /* Nonzero means warn if inline function is too large. */
1433 /* Warn if a function returns an aggregate,
1434 since there are often incompatible calling conventions for doing this. */
1436 int warn_aggregate_return;
1438 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1442 /* Warn when gcc pads a structure to an alignment boundary. */
1446 /* Warn when an optimization pass is disabled. */
1448 int warn_disabled_optimization;
1450 /* Warn about functions which might be candidates for attribute noreturn. */
1452 int warn_missing_noreturn;
1454 /* Nonzero means warn about uses of __attribute__((deprecated))
1457 int warn_deprecated_decl = 1;
1459 /* Likewise for -W. */
1461 static const lang_independent_options W_options[] =
1463 {"unused-function", &warn_unused_function, 1,
1464 N_("Warn when a function is unused") },
1465 {"unused-label", &warn_unused_label, 1,
1466 N_("Warn when a label is unused") },
1467 {"unused-parameter", &warn_unused_parameter, 1,
1468 N_("Warn when a function parameter is unused") },
1469 {"unused-variable", &warn_unused_variable, 1,
1470 N_("Warn when a variable is unused") },
1471 {"unused-value", &warn_unused_value, 1,
1472 N_("Warn when an expression value is unused") },
1473 {"system-headers", &warn_system_headers, 1,
1474 N_("Do not suppress warnings from system headers") },
1475 {"error", &warnings_are_errors, 1,
1476 N_("Treat all warnings as errors") },
1477 {"shadow", &warn_shadow, 1,
1478 N_("Warn when one local variable shadows another") },
1479 {"switch", &warn_switch, 1,
1480 N_("Warn about enumerated switches, with no default, missing a case") },
1481 {"switch-default", &warn_switch_default, 1,
1482 N_("Warn about enumerated switches missing a default case") },
1483 {"switch-enum", &warn_switch_enum, 1,
1484 N_("Warn about all enumerated switches missing a specific case") },
1485 {"aggregate-return", &warn_aggregate_return, 1,
1486 N_("Warn about returning structures, unions or arrays") },
1487 {"cast-align", &warn_cast_align, 1,
1488 N_("Warn about pointer casts which increase alignment") },
1489 {"unreachable-code", &warn_notreached, 1,
1490 N_("Warn about code that will never be executed") },
1491 {"uninitialized", &warn_uninitialized, 1,
1492 N_("Warn about uninitialized automatic variables") },
1493 {"inline", &warn_inline, 1,
1494 N_("Warn when an inlined function cannot be inlined") },
1495 {"packed", &warn_packed, 1,
1496 N_("Warn when the packed attribute has no effect on struct layout") },
1497 {"padded", &warn_padded, 1,
1498 N_("Warn when padding is required to align struct members") },
1499 {"disabled-optimization", &warn_disabled_optimization, 1,
1500 N_("Warn when an optimization pass is disabled") },
1501 {"deprecated-declarations", &warn_deprecated_decl, 1,
1502 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1503 {"missing-noreturn", &warn_missing_noreturn, 1,
1504 N_("Warn about functions which might be candidates for attribute noreturn") }
1508 set_Wunused (setting)
1511 warn_unused_function = setting;
1512 warn_unused_label = setting;
1513 /* Unused function parameter warnings are reported when either ``-W
1514 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1515 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1517 warn_unused_parameter = 0;
1518 else if (!warn_unused_parameter)
1519 warn_unused_parameter = -1;
1520 warn_unused_variable = setting;
1521 warn_unused_value = setting;
1524 /* The following routines are useful in setting all the flags that
1525 -ffast-math and -fno-fast-math imply. */
1528 set_fast_math_flags ()
1530 flag_trapping_math = 0;
1531 flag_unsafe_math_optimizations = 1;
1532 flag_errno_math = 0;
1536 set_no_fast_math_flags ()
1538 flag_trapping_math = 1;
1539 flag_unsafe_math_optimizations = 0;
1540 flag_errno_math = 1;
1544 /* Output files for assembler code (real compiler output)
1545 and debugging dumps. */
1548 FILE *aux_info_file;
1549 FILE *rtl_dump_file = NULL;
1551 /* Decode the string P as an integral parameter.
1552 If the string is indeed an integer return its numeric value else
1553 issue an Invalid Option error for the option PNAME and return DEFVAL.
1554 If PNAME is zero just return DEFVAL, do not call error. */
1557 read_integral_parameter (p, pname, defval)
1562 const char *endp = p;
1566 if (ISDIGIT (*endp))
1575 error ("invalid option `%s'", pname);
1582 /* This calls abort and is used to avoid problems when abort if a macro.
1583 It is used when we need to pass the address of abort. */
1591 /* When `malloc.c' is compiled with `rcheck' defined,
1592 it calls this function to report clobberage. */
1596 const char *s ATTRIBUTE_UNUSED;
1601 /* Return the logarithm of X, base 2, considering X unsigned,
1602 if X is a power of 2. Otherwise, returns -1.
1604 This should be used via the `exact_log2' macro. */
1608 unsigned HOST_WIDE_INT x;
1611 /* Test for 0 or a power of 2. */
1612 if (x == 0 || x != (x & -x))
1614 while ((x >>= 1) != 0)
1619 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1620 If X is 0, return -1.
1622 This should be used via the floor_log2 macro. */
1626 unsigned HOST_WIDE_INT x;
1635 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1636 into ICE messages, which is much more user friendly. */
1639 crash_signal (signo)
1642 internal_error ("internal error: %s", strsignal (signo));
1645 /* Strip off a legitimate source ending from the input string NAME of
1646 length LEN. Rather than having to know the names used by all of
1647 our front ends, we strip off an ending of a period followed by
1648 up to five characters. (Java uses ".class".) */
1651 strip_off_ending (name, len)
1656 for (i = 2; i < 6 && len > i; i++)
1658 if (name[len - i] == '.')
1660 name[len - i] = '\0';
1666 /* Output a quoted string. */
1669 output_quoted_string (asm_file, string)
1673 #ifdef OUTPUT_QUOTED_STRING
1674 OUTPUT_QUOTED_STRING (asm_file, string);
1678 putc ('\"', asm_file);
1679 while ((c = *string++) != 0)
1683 if (c == '\"' || c == '\\')
1684 putc ('\\', asm_file);
1688 fprintf (asm_file, "\\%03o", c);
1690 putc ('\"', asm_file);
1694 /* Output a file name in the form wanted by System V. */
1697 output_file_directive (asm_file, input_name)
1699 const char *input_name;
1701 int len = strlen (input_name);
1702 const char *na = input_name + len;
1704 /* NA gets INPUT_NAME sans directory names. */
1705 while (na > input_name)
1707 if (IS_DIR_SEPARATOR (na[-1]))
1712 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1713 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1715 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1716 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1718 fprintf (asm_file, "\t.file\t");
1719 output_quoted_string (asm_file, na);
1720 fputc ('\n', asm_file);
1725 /* Routine to open a dump file. Return true if the dump file is enabled. */
1728 open_dump_file (index, decl)
1729 enum dump_file_index index;
1733 const char *open_arg;
1736 if (! dump_file[index].enabled)
1739 timevar_push (TV_DUMP);
1740 if (rtl_dump_file != NULL)
1741 fclose (rtl_dump_file);
1743 sprintf (seq, DUMPFILE_FORMAT, index);
1745 if (! dump_file[index].initialized)
1747 /* If we've not initialized the files, do so now. */
1748 if (graph_dump_format != no_graph
1749 && dump_file[index].graph_dump_p)
1751 dump_name = concat (seq, dump_file[index].extension, NULL);
1752 clean_graph_dump_file (dump_base_name, dump_name);
1755 dump_file[index].initialized = 1;
1761 dump_name = concat (dump_base_name, seq,
1762 dump_file[index].extension, NULL);
1764 rtl_dump_file = fopen (dump_name, open_arg);
1765 if (rtl_dump_file == NULL)
1766 fatal_io_error ("can't open %s", dump_name);
1771 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1772 (*lang_hooks.decl_printable_name) (decl, 2));
1774 timevar_pop (TV_DUMP);
1778 /* Routine to close a dump file. */
1781 close_dump_file (index, func, insns)
1782 enum dump_file_index index;
1783 void (*func) PARAMS ((FILE *, rtx));
1786 if (! rtl_dump_file)
1789 timevar_push (TV_DUMP);
1791 && graph_dump_format != no_graph
1792 && dump_file[index].graph_dump_p)
1797 sprintf (seq, DUMPFILE_FORMAT, index);
1798 suffix = concat (seq, dump_file[index].extension, NULL);
1799 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1804 func (rtl_dump_file, insns);
1806 fflush (rtl_dump_file);
1807 fclose (rtl_dump_file);
1809 rtl_dump_file = NULL;
1810 timevar_pop (TV_DUMP);
1813 /* Do any final processing required for the declarations in VEC, of
1814 which there are LEN. We write out inline functions and variables
1815 that have been deferred until this point, but which are required.
1816 Returns non-zero if anything was put out. */
1819 wrapup_global_declarations (vec, len)
1826 int output_something = 0;
1828 for (i = 0; i < len; i++)
1832 /* We're not deferring this any longer. */
1833 DECL_DEFER_OUTPUT (decl) = 0;
1835 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1836 (*lang_hooks.finish_incomplete_decl) (decl);
1839 /* Now emit any global variables or functions that we have been
1840 putting off. We need to loop in case one of the things emitted
1841 here references another one which comes earlier in the list. */
1845 for (i = 0; i < len; i++)
1849 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1852 /* Don't write out static consts, unless we still need them.
1854 We also keep static consts if not optimizing (for debugging),
1855 unless the user specified -fno-keep-static-consts.
1856 ??? They might be better written into the debug information.
1857 This is possible when using DWARF.
1859 A language processor that wants static constants to be always
1860 written out (even if it is not used) is responsible for
1861 calling rest_of_decl_compilation itself. E.g. the C front-end
1862 calls rest_of_decl_compilation from finish_decl.
1863 One motivation for this is that is conventional in some
1864 environments to write things like:
1865 static const char rcsid[] = "... version string ...";
1866 intending to force the string to be in the executable.
1868 A language processor that would prefer to have unneeded
1869 static constants "optimized away" would just defer writing
1870 them out until here. E.g. C++ does this, because static
1871 constants are often defined in header files.
1873 ??? A tempting alternative (for both C and C++) would be
1874 to force a constant to be written if and only if it is
1875 defined in a main file, as opposed to an include file. */
1877 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1881 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1883 else if (DECL_COMDAT (decl))
1885 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1886 && (optimize || !flag_keep_static_consts
1887 || DECL_ARTIFICIAL (decl)))
1893 rest_of_decl_compilation (decl, NULL, 1, 1);
1897 if (TREE_CODE (decl) == FUNCTION_DECL
1898 && DECL_INITIAL (decl) != 0
1899 && DECL_SAVED_INSNS (decl) != 0
1900 && (flag_keep_inline_functions
1901 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1902 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1905 output_inline_function (decl);
1910 output_something = 1;
1914 return output_something;
1917 /* Issue appropriate warnings for the global declarations in VEC (of
1918 which there are LEN). Output debugging information for them. */
1921 check_global_declarations (vec, len)
1928 for (i = 0; i < len; i++)
1932 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1933 && ! TREE_ASM_WRITTEN (decl))
1934 /* Cancel the RTL for this decl so that, if debugging info
1935 output for global variables is still to come,
1936 this one will be omitted. */
1937 SET_DECL_RTL (decl, NULL_RTX);
1939 /* Warn about any function
1940 declared static but not defined.
1941 We don't warn about variables,
1942 because many programs have static variables
1943 that exist only to get some text into the object file. */
1944 if (TREE_CODE (decl) == FUNCTION_DECL
1945 && (warn_unused_function
1946 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1947 && DECL_INITIAL (decl) == 0
1948 && DECL_EXTERNAL (decl)
1949 && ! DECL_ARTIFICIAL (decl)
1950 && ! TREE_PUBLIC (decl))
1952 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1953 pedwarn_with_decl (decl,
1954 "`%s' used but never defined");
1956 warning_with_decl (decl,
1957 "`%s' declared `static' but never defined");
1958 /* This symbol is effectively an "extern" declaration now. */
1959 TREE_PUBLIC (decl) = 1;
1960 assemble_external (decl);
1963 /* Warn about static fns or vars defined but not used. */
1964 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1965 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1966 && ! TREE_USED (decl)
1967 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1968 to handle multiple external decls in different scopes. */
1969 && ! TREE_USED (DECL_NAME (decl))
1970 && ! DECL_EXTERNAL (decl)
1971 && ! TREE_PUBLIC (decl)
1972 /* Global register variables must be declared to reserve them. */
1973 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1974 /* Otherwise, ask the language. */
1975 && (*lang_hooks.decls.warn_unused_global) (decl))
1976 warning_with_decl (decl, "`%s' defined but not used");
1978 timevar_push (TV_SYMOUT);
1979 (*debug_hooks->global_decl) (decl);
1980 timevar_pop (TV_SYMOUT);
1984 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
1985 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1986 INPUT_FILENAME and LINENO accordingly. */
1989 push_srcloc (file, line)
1993 struct file_stack *fs;
1995 if (input_file_stack)
1997 input_file_stack->name = input_filename;
1998 input_file_stack->line = lineno;
2001 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2002 fs->name = input_filename = file;
2003 fs->line = lineno = line;
2004 fs->indent_level = 0;
2005 fs->next = input_file_stack;
2006 input_file_stack = fs;
2007 input_file_stack_tick++;
2010 /* Pop the top entry off the stack of presently open source files.
2011 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2017 struct file_stack *fs;
2019 fs = input_file_stack;
2020 input_file_stack = fs->next;
2022 input_file_stack_tick++;
2023 /* The initial source file is never popped. */
2024 if (!input_file_stack)
2026 input_filename = input_file_stack->name;
2027 lineno = input_file_stack->line;
2030 /* Compile an entire translation unit. Write a file of assembly
2031 output and various debugging dumps. */
2038 /* Initialize yet another pass. */
2040 init_final (main_input_filename);
2041 init_branch_prob (dump_base_name);
2043 timevar_push (TV_PARSE);
2045 /* Call the parser, which parses the entire file (calling
2046 rest_of_compilation for each function). */
2047 (*lang_hooks.parse_file) (set_yydebug);
2049 /* In case there were missing block closers,
2050 get us back to the global binding level. */
2051 (*lang_hooks.clear_binding_stack) ();
2053 /* Compilation is now finished except for writing
2054 what's left of the symbol table output. */
2055 timevar_pop (TV_PARSE);
2057 if (flag_syntax_only)
2060 globals = (*lang_hooks.decls.getdecls) ();
2062 /* Really define vars that have had only a tentative definition.
2063 Really output inline functions that must actually be callable
2064 and have not been output so far. */
2067 int len = list_length (globals);
2068 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2072 /* Process the decls in reverse order--earliest first.
2073 Put them into VEC from back to front, then take out from front. */
2075 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2076 vec[len - i - 1] = decl;
2078 wrapup_global_declarations (vec, len);
2080 /* This must occur after the loop to output deferred functions. Else
2081 the profiler initializer would not be emitted if all the functions
2082 in this compilation unit were deferred.
2084 output_func_start_profiler can not cause any additional functions or
2085 data to need to be output, so it need not be in the deferred function
2087 output_func_start_profiler ();
2089 check_global_declarations (vec, len);
2095 /* Write out any pending weak symbol declarations. */
2099 /* Do dbx symbols. */
2100 timevar_push (TV_SYMOUT);
2102 #ifdef DWARF2_UNWIND_INFO
2103 if (dwarf2out_do_frame ())
2104 dwarf2out_frame_finish ();
2107 (*debug_hooks->finish) (main_input_filename);
2108 timevar_pop (TV_SYMOUT);
2110 /* Output some stuff at end of file if nec. */
2112 dw2_output_indirect_constants ();
2114 end_final (dump_base_name);
2116 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2118 timevar_push (TV_DUMP);
2119 open_dump_file (DFI_bp, NULL);
2123 close_dump_file (DFI_bp, NULL, NULL_RTX);
2124 timevar_pop (TV_DUMP);
2128 ASM_FILE_END (asm_out_file);
2131 /* Attach a special .ident directive to the end of the file to identify
2132 the version of GCC which compiled this code. The format of the .ident
2133 string is patterned after the ones produced by native SVR4 compilers. */
2136 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2137 IDENT_ASM_OP, version_string);
2140 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2142 timevar_push (TV_DUMP);
2143 dump_combine_total_stats (rtl_dump_file);
2144 close_dump_file (DFI_combine, NULL, NULL_RTX);
2145 timevar_pop (TV_DUMP);
2149 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2150 and TYPE_DECL nodes.
2152 This does nothing for local (non-static) variables, unless the
2153 variable is a register variable with an ASMSPEC. In that case, or
2154 if the variable is not an automatic, it sets up the RTL and
2155 outputs any assembler code (label definition, storage allocation
2156 and initialization).
2158 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2159 the assembler symbol name to be used. TOP_LEVEL is nonzero
2160 if this declaration is not within a function. */
2163 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2165 const char *asmspec;
2169 /* Declarations of variables, and of functions defined elsewhere. */
2171 /* The most obvious approach, to put an #ifndef around where
2172 this macro is used, doesn't work since it's inside a macro call. */
2173 #ifndef ASM_FINISH_DECLARE_OBJECT
2174 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2177 /* We deferred calling assemble_alias so that we could collect
2178 other attributes such as visibility. Emit the alias now. */
2181 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2184 alias = TREE_VALUE (TREE_VALUE (alias));
2185 alias = get_identifier (TREE_STRING_POINTER (alias));
2186 assemble_alias (decl, alias);
2190 /* Forward declarations for nested functions are not "external",
2191 but we need to treat them as if they were. */
2192 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2193 || TREE_CODE (decl) == FUNCTION_DECL)
2195 timevar_push (TV_VARCONST);
2198 make_decl_rtl (decl, asmspec);
2200 /* Don't output anything when a tentative file-scope definition
2201 is seen. But at end of compilation, do output code for them. */
2202 if (at_end || !DECL_DEFER_OUTPUT (decl))
2203 assemble_variable (decl, top_level, at_end, 0);
2204 if (decl == last_assemble_variable_decl)
2206 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2210 timevar_pop (TV_VARCONST);
2212 else if (DECL_REGISTER (decl) && asmspec != 0)
2214 if (decode_reg_name (asmspec) >= 0)
2216 SET_DECL_RTL (decl, NULL_RTX);
2217 make_decl_rtl (decl, asmspec);
2221 error ("invalid register name `%s' for register variable", asmspec);
2222 DECL_REGISTER (decl) = 0;
2227 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2228 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2229 && TREE_CODE (decl) == TYPE_DECL)
2231 timevar_push (TV_SYMOUT);
2232 dbxout_symbol (decl, 0);
2233 timevar_pop (TV_SYMOUT);
2236 #ifdef SDB_DEBUGGING_INFO
2237 else if (write_symbols == SDB_DEBUG && top_level
2238 && TREE_CODE (decl) == TYPE_DECL)
2240 timevar_push (TV_SYMOUT);
2241 sdbout_symbol (decl, 0);
2242 timevar_pop (TV_SYMOUT);
2247 /* Called after finishing a record, union or enumeral type. */
2250 rest_of_type_compilation (type, toplev)
2251 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2255 tree type ATTRIBUTE_UNUSED;
2256 int toplev ATTRIBUTE_UNUSED;
2259 timevar_push (TV_SYMOUT);
2260 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2261 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2262 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2264 #ifdef SDB_DEBUGGING_INFO
2265 if (write_symbols == SDB_DEBUG)
2266 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2268 #ifdef DWARF2_DEBUGGING_INFO
2269 if ((write_symbols == DWARF2_DEBUG
2270 || write_symbols == VMS_AND_DWARF2_DEBUG)
2272 dwarf2out_decl (TYPE_STUB_DECL (type));
2274 timevar_pop (TV_SYMOUT);
2277 /* This is called from finish_function (within langhooks.parse_file)
2278 after each top-level definition is parsed.
2279 It is supposed to compile that function or variable
2280 and output the assembler code for it.
2281 After we return, the tree storage is freed. */
2284 rest_of_compilation (decl)
2290 int rebuild_label_notes_after_reload;
2291 int register_life_up_to_date;
2293 timevar_push (TV_REST_OF_COMPILATION);
2295 /* Now that we're out of the frontend, we shouldn't have any more
2296 CONCATs anywhere. */
2297 generating_concat_p = 0;
2299 /* When processing delayed functions, prepare_function_start() won't
2300 have been run to re-initialize it. */
2301 cse_not_expected = ! optimize;
2303 /* First, make sure that NOTE_BLOCK is set correctly for each
2304 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2305 if (!cfun->x_whole_function_mode_p)
2308 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2309 tree in sensible shape. So, we just recalculate it here. */
2310 if (cfun->x_whole_function_mode_p)
2315 /* If we are reconsidering an inline function
2316 at the end of compilation, skip the stuff for making it inline. */
2318 if (DECL_SAVED_INSNS (decl) == 0)
2324 /* If this is nested inside an inlined external function, pretend
2325 it was only declared. Since we cannot inline such functions,
2326 generating code for this one is not only not necessary but will
2327 confuse some debugging output writers. */
2328 for (parent = DECL_CONTEXT (current_function_decl);
2329 parent != NULL_TREE;
2330 parent = get_containing_scope (parent))
2331 if (TREE_CODE (parent) == FUNCTION_DECL
2332 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2334 DECL_INITIAL (decl) = 0;
2335 goto exit_rest_of_compilation;
2338 /* If requested, consider whether to make this function inline. */
2339 if ((DECL_INLINE (decl) && !flag_no_inline)
2340 || flag_inline_functions)
2342 timevar_push (TV_INTEGRATION);
2343 lose = function_cannot_inline_p (decl);
2344 timevar_pop (TV_INTEGRATION);
2345 if (lose || ! optimize)
2347 if (warn_inline && DECL_INLINE (decl))
2348 warning_with_decl (decl, lose);
2349 DECL_ABSTRACT_ORIGIN (decl) = 0;
2350 /* Don't really compile an extern inline function.
2351 If we can't make it inline, pretend
2352 it was only declared. */
2353 if (DECL_EXTERNAL (decl))
2355 DECL_INITIAL (decl) = 0;
2356 goto exit_rest_of_compilation;
2360 /* ??? Note that this has the effect of making it look
2361 like "inline" was specified for a function if we choose
2362 to inline it. This isn't quite right, but it's
2363 probably not worth the trouble to fix. */
2364 inlinable = DECL_INLINE (decl) = 1;
2367 insns = get_insns ();
2369 /* Dump the rtl code if we are dumping rtl. */
2371 if (open_dump_file (DFI_rtl, decl))
2373 if (DECL_SAVED_INSNS (decl))
2374 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2375 close_dump_file (DFI_rtl, print_rtl, insns);
2378 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2379 sorts of eh initialization. Delay this until after the
2380 initial rtl dump so that we can see the original nesting. */
2381 convert_from_eh_region_ranges ();
2383 /* If function is inline, and we don't yet know whether to
2384 compile it by itself, defer decision till end of compilation.
2385 finish_compilation will call rest_of_compilation again
2386 for those functions that need to be output. Also defer those
2387 functions that we are supposed to defer. */
2390 || (DECL_INLINE (decl)
2391 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2392 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2393 && ! flag_keep_inline_functions)
2394 || DECL_EXTERNAL (decl))))
2395 DECL_DEFER_OUTPUT (decl) = 1;
2397 if (DECL_INLINE (decl))
2398 /* DWARF wants separate debugging info for abstract and
2399 concrete instances of all inline functions, including those
2400 declared inline but not inlined, and those inlined even
2401 though they weren't declared inline. Conveniently, that's
2402 what DECL_INLINE means at this point. */
2403 (*debug_hooks->deferred_inline_function) (decl);
2405 if (DECL_DEFER_OUTPUT (decl))
2407 /* If -Wreturn-type, we have to do a bit of compilation. We just
2408 want to call cleanup the cfg to figure out whether or not we can
2409 fall off the end of the function; we do the minimum amount of
2410 work necessary to make that safe. */
2411 if (warn_return_type)
2413 int saved_optimize = optimize;
2416 rebuild_jump_labels (insns);
2417 find_exception_handler_labels ();
2418 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2419 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2420 optimize = saved_optimize;
2422 /* CFG is no longer maintained up-to-date. */
2423 free_bb_for_insn ();
2426 current_function_nothrow = nothrow_function_p ();
2427 if (current_function_nothrow)
2428 /* Now we know that this can't throw; set the flag for the benefit
2429 of other functions later in this translation unit. */
2430 TREE_NOTHROW (current_function_decl) = 1;
2432 timevar_push (TV_INTEGRATION);
2433 save_for_inline (decl);
2434 timevar_pop (TV_INTEGRATION);
2435 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2436 goto exit_rest_of_compilation;
2439 /* If specified extern inline but we aren't inlining it, we are
2440 done. This goes for anything that gets here with DECL_EXTERNAL
2441 set, not just things with DECL_INLINE. */
2442 if (DECL_EXTERNAL (decl))
2443 goto exit_rest_of_compilation;
2446 /* If we're emitting a nested function, make sure its parent gets
2447 emitted as well. Doing otherwise confuses debug info. */
2450 for (parent = DECL_CONTEXT (current_function_decl);
2451 parent != NULL_TREE;
2452 parent = get_containing_scope (parent))
2453 if (TREE_CODE (parent) == FUNCTION_DECL)
2454 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2457 /* We are now committed to emitting code for this function. Do any
2458 preparation, such as emitting abstract debug info for the inline
2459 before it gets mangled by optimization. */
2460 if (DECL_INLINE (decl))
2461 (*debug_hooks->outlining_inline_function) (decl);
2463 /* Remove any notes we don't need. That will make iterating
2464 over the instruction sequence faster, and allow the garbage
2465 collector to reclaim the memory used by the notes. */
2466 remove_unnecessary_notes ();
2471 /* Initialize some variables used by the optimizers. */
2472 init_function_for_compilation ();
2474 if (! DECL_DEFER_OUTPUT (decl))
2475 TREE_ASM_WRITTEN (decl) = 1;
2477 /* Now that integrate will no longer see our rtl, we need not
2478 distinguish between the return value of this function and the
2479 return value of called functions. Also, we can remove all SETs
2480 of subregs of hard registers; they are only here because of
2481 integrate. Also, we can now initialize pseudos intended to
2482 carry magic hard reg data throughout the function. */
2483 rtx_equal_function_value_matters = 0;
2484 purge_hard_subreg_sets (get_insns ());
2486 /* Early return if there were errors. We can run afoul of our
2487 consistency checks, and there's not really much point in fixing them.
2488 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2489 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2490 || errorcount || sorrycount)
2491 goto exit_rest_of_compilation;
2493 /* We may have potential sibling or tail recursion sites. Select one
2494 (of possibly multiple) methods of performing the call. */
2495 if (flag_optimize_sibling_calls)
2497 timevar_push (TV_JUMP);
2498 open_dump_file (DFI_sibling, decl);
2500 optimize_sibling_and_tail_recursive_calls ();
2502 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2503 timevar_pop (TV_JUMP);
2506 /* Complete generation of exception handling code. */
2507 find_exception_handler_labels ();
2510 timevar_push (TV_JUMP);
2511 open_dump_file (DFI_eh, decl);
2513 finish_eh_generation ();
2515 close_dump_file (DFI_eh, print_rtl, get_insns ());
2516 timevar_pop (TV_JUMP);
2519 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2520 generation, which might create new sets. */
2521 emit_initial_value_sets ();
2524 /* If we are doing position-independent code generation, now
2525 is the time to output special prologues and epilogues.
2526 We do not want to do this earlier, because it just clutters
2527 up inline functions with meaningless insns. */
2532 insns = get_insns ();
2534 /* Copy any shared structure that should not be shared. */
2535 unshare_all_rtl (current_function_decl, insns);
2537 #ifdef SETJMP_VIA_SAVE_AREA
2538 /* This must be performed before virtual register instantiation. */
2539 if (current_function_calls_alloca)
2540 optimize_save_area_alloca (insns);
2543 /* Instantiate all virtual registers. */
2544 instantiate_virtual_regs (current_function_decl, insns);
2546 open_dump_file (DFI_jump, decl);
2548 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2549 are initialized and to compute whether control can drop off the end
2552 timevar_push (TV_JUMP);
2553 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2554 before jump optimization switches branch directions. */
2555 expected_value_to_br_prob ();
2557 reg_scan (insns, max_reg_num (), 0);
2558 rebuild_jump_labels (insns);
2559 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2561 dump_flow_info (rtl_dump_file);
2562 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2563 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2565 /* CFG is no longer maintained up-to-date. */
2566 free_bb_for_insn ();
2567 copy_loop_headers (insns);
2568 purge_line_number_notes (insns);
2570 timevar_pop (TV_JUMP);
2571 close_dump_file (DFI_jump, print_rtl, insns);
2573 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2574 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2576 goto exit_rest_of_compilation;
2579 /* Long term, this should probably move before the jump optimizer too,
2580 but I didn't want to disturb the rtl_dump_and_exit and related
2581 stuff at this time. */
2582 if (optimize > 0 && flag_ssa)
2584 /* Convert to SSA form. */
2586 timevar_push (TV_TO_SSA);
2587 open_dump_file (DFI_ssa, decl);
2589 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2590 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2593 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2594 timevar_pop (TV_TO_SSA);
2596 /* Perform sparse conditional constant propagation, if requested. */
2599 timevar_push (TV_SSA_CCP);
2600 open_dump_file (DFI_ssa_ccp, decl);
2604 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2605 timevar_pop (TV_SSA_CCP);
2608 /* It would be useful to cleanup the CFG at this point, but block
2609 merging and possibly other transformations might leave a PHI
2610 node in the middle of a basic block, which is a strict no-no. */
2612 /* The SSA implementation uses basic block numbers in its phi
2613 nodes. Thus, changing the control-flow graph or the basic
2614 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2615 may cause problems. */
2619 /* Remove dead code. */
2621 timevar_push (TV_SSA_DCE);
2622 open_dump_file (DFI_ssa_dce, decl);
2624 insns = get_insns ();
2625 ssa_eliminate_dead_code();
2627 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2628 timevar_pop (TV_SSA_DCE);
2631 /* Convert from SSA form. */
2633 timevar_push (TV_FROM_SSA);
2634 open_dump_file (DFI_ussa, decl);
2636 convert_from_ssa ();
2637 /* New registers have been created. Rescan their usage. */
2638 reg_scan (insns, max_reg_num (), 1);
2640 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2641 timevar_pop (TV_FROM_SSA);
2644 /* CFG is no longer maintained up-to-date. */
2645 free_bb_for_insn ();
2648 timevar_push (TV_JUMP);
2650 if (flag_delete_null_pointer_checks || flag_if_conversion)
2652 open_dump_file (DFI_null, decl);
2653 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2655 dump_flow_info (rtl_dump_file);
2656 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2658 /* Try to identify useless null pointer tests and delete them. */
2659 if (flag_delete_null_pointer_checks)
2660 delete_null_pointer_checks (insns);
2662 timevar_push (TV_IFCVT);
2663 if (flag_if_conversion)
2665 timevar_pop (TV_IFCVT);
2666 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2667 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2670 /* Jump optimization, and the removal of NULL pointer checks, may
2671 have reduced the number of instructions substantially. CSE, and
2672 future passes, allocate arrays whose dimensions involve the
2673 maximum instruction UID, so if we can reduce the maximum UID
2674 we'll save big on memory. */
2675 renumber_insns (rtl_dump_file);
2677 compute_bb_for_insn (get_max_uid ());
2678 timevar_pop (TV_JUMP);
2680 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2684 /* Perform common subexpression elimination.
2685 Nonzero value from `cse_main' means that jumps were simplified
2686 and some code may now be unreachable, so do
2687 jump optimization again. */
2691 open_dump_file (DFI_cse, decl);
2693 dump_flow_info (rtl_dump_file);
2694 timevar_push (TV_CSE);
2696 reg_scan (insns, max_reg_num (), 1);
2698 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2700 rebuild_jump_labels (insns);
2701 purge_all_dead_edges (0);
2703 delete_trivially_dead_insns (insns, max_reg_num ());
2705 /* If we are not running more CSE passes, then we are no longer
2706 expecting CSE to be run. But always rerun it in a cheap mode. */
2707 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2709 if (tem || optimize > 1)
2710 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2711 /* Try to identify useless null pointer tests and delete them. */
2712 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2714 timevar_push (TV_JUMP);
2716 if (flag_delete_null_pointer_checks)
2717 delete_null_pointer_checks (insns);
2718 /* CFG is no longer maintained up-to-date. */
2719 timevar_pop (TV_JUMP);
2722 /* The second pass of jump optimization is likely to have
2723 removed a bunch more instructions. */
2724 renumber_insns (rtl_dump_file);
2725 compute_bb_for_insn (get_max_uid ());
2727 timevar_pop (TV_CSE);
2728 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2731 open_dump_file (DFI_addressof, decl);
2733 purge_addressof (insns);
2735 purge_all_dead_edges (0);
2736 reg_scan (insns, max_reg_num (), 1);
2738 close_dump_file (DFI_addressof, print_rtl, insns);
2742 /* Perform global cse. */
2744 if (optimize > 0 && flag_gcse)
2746 int save_csb, save_cfj;
2749 timevar_push (TV_GCSE);
2750 open_dump_file (DFI_gcse, decl);
2752 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2753 tem = gcse_main (insns, rtl_dump_file);
2754 rebuild_jump_labels (insns);
2755 delete_trivially_dead_insns (insns, max_reg_num ());
2757 save_csb = flag_cse_skip_blocks;
2758 save_cfj = flag_cse_follow_jumps;
2759 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2761 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2763 if (flag_expensive_optimizations)
2765 timevar_push (TV_CSE);
2766 reg_scan (insns, max_reg_num (), 1);
2767 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2768 purge_all_dead_edges (0);
2769 delete_trivially_dead_insns (insns, max_reg_num ());
2770 timevar_pop (TV_CSE);
2771 cse_not_expected = !flag_rerun_cse_after_loop;
2774 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2775 things up. Then possibly re-run CSE again. */
2779 timevar_push (TV_JUMP);
2780 rebuild_jump_labels (insns);
2781 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2782 timevar_pop (TV_JUMP);
2784 if (flag_expensive_optimizations)
2786 timevar_push (TV_CSE);
2787 reg_scan (insns, max_reg_num (), 1);
2788 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2789 purge_all_dead_edges (0);
2790 delete_trivially_dead_insns (insns, max_reg_num ());
2791 timevar_pop (TV_CSE);
2795 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2796 timevar_pop (TV_GCSE);
2799 flag_cse_skip_blocks = save_csb;
2800 flag_cse_follow_jumps = save_cfj;
2801 #ifdef ENABLE_CHECKING
2802 verify_flow_info ();
2806 /* Move constant computations out of loops. */
2808 if (optimize > 0 && flag_loop_optimize)
2810 timevar_push (TV_LOOP);
2811 delete_dead_jumptables ();
2812 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2813 open_dump_file (DFI_loop, decl);
2814 /* CFG is no longer maintained up-to-date. */
2815 free_bb_for_insn ();
2817 if (flag_rerun_loop_opt)
2819 cleanup_barriers ();
2821 /* We only want to perform unrolling once. */
2822 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2824 /* The first call to loop_optimize makes some instructions
2825 trivially dead. We delete those instructions now in the
2826 hope that doing so will make the heuristics in loop work
2827 better and possibly speed up compilation. */
2828 delete_trivially_dead_insns (insns, max_reg_num ());
2830 /* The regscan pass is currently necessary as the alias
2831 analysis code depends on this information. */
2832 reg_scan (insns, max_reg_num (), 1);
2834 cleanup_barriers ();
2835 loop_optimize (insns, rtl_dump_file,
2836 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2837 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2839 /* Loop can create trivially dead instructions. */
2840 delete_trivially_dead_insns (insns, max_reg_num ());
2841 close_dump_file (DFI_loop, print_rtl, insns);
2842 timevar_pop (TV_LOOP);
2847 /* Do control and data flow analysis; wrote some of the results to
2850 timevar_push (TV_FLOW);
2851 open_dump_file (DFI_cfg, decl);
2853 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2855 dump_flow_info (rtl_dump_file);
2856 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2857 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2859 /* It may make more sense to mark constant functions after dead code is
2860 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2861 may insert code making function non-constant, but we still must consider
2862 it as constant, otherwise -fbranch-probabilities will not read data back.
2864 life_analyzis rarely eliminates modification of external memory.
2867 mark_constant_function ();
2869 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2871 /* Do branch profiling and static profile estimation passes. */
2872 if (optimize > 0 || profile_arc_flag || flag_test_coverage
2873 || flag_branch_probabilities)
2877 timevar_push (TV_BRANCH_PROB);
2878 open_dump_file (DFI_bp, decl);
2879 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2882 /* Discover and record the loop depth at the head of each basic
2883 block. The loop infrastructure does the real job for us. */
2884 flow_loops_find (&loops, LOOP_TREE);
2886 /* Estimate using heuristics if no profiling info is available. */
2887 if (flag_guess_branch_prob)
2888 estimate_probability (&loops);
2891 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2893 flow_loops_free (&loops);
2894 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2895 timevar_pop (TV_BRANCH_PROB);
2900 timevar_push (TV_CSE2);
2901 open_dump_file (DFI_cse2, decl);
2903 dump_flow_info (rtl_dump_file);
2905 if (flag_rerun_cse_after_loop)
2907 timevar_push (TV_JUMP);
2909 reg_scan (insns, max_reg_num (), 0);
2911 timevar_push (TV_IFCVT);
2912 cleanup_cfg (CLEANUP_EXPENSIVE);
2913 if (flag_if_conversion)
2915 timevar_pop(TV_IFCVT);
2917 timevar_pop (TV_JUMP);
2918 /* CFG is no longer maintained up-to-date. */
2919 reg_scan (insns, max_reg_num (), 0);
2920 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2921 purge_all_dead_edges (0);
2922 delete_trivially_dead_insns (insns, max_reg_num ());
2926 timevar_push (TV_JUMP);
2927 rebuild_jump_labels (insns);
2928 cleanup_cfg (CLEANUP_EXPENSIVE);
2929 timevar_pop (TV_JUMP);
2933 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2934 timevar_pop (TV_CSE2);
2939 cse_not_expected = 1;
2941 open_dump_file (DFI_life, decl);
2944 check_function_return_warnings ();
2946 #ifdef ENABLE_CHECKING
2947 verify_flow_info ();
2949 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2951 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2952 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2953 timevar_pop (TV_FLOW);
2957 if (warn_uninitialized || extra_warnings)
2959 uninitialized_vars_warning (DECL_INITIAL (decl));
2961 setjmp_args_warning ();
2967 if (initialize_uninitialized_subregs ())
2969 /* Insns were inserted, so things might look a bit different. */
2970 insns = get_insns ();
2971 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
2972 PROP_LOG_LINKS | PROP_REG_INFO
2973 | PROP_DEATH_NOTES);
2977 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2981 /* If -opt, try combining insns through substitution. */
2985 int rebuild_jump_labels_after_combine = 0;
2987 timevar_push (TV_COMBINE);
2988 open_dump_file (DFI_combine, decl);
2990 rebuild_jump_labels_after_combine
2991 = combine_instructions (insns, max_reg_num ());
2993 /* Combining insns may have turned an indirect jump into a
2994 direct jump. Rebuid the JUMP_LABEL fields of jumping
2996 if (rebuild_jump_labels_after_combine)
2998 timevar_push (TV_JUMP);
2999 rebuild_jump_labels (insns);
3000 timevar_pop (TV_JUMP);
3002 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3005 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3006 timevar_pop (TV_COMBINE);
3011 /* Rerun if-conversion, as combine may have simplified things enough to
3012 now meet sequence length restrictions. */
3013 if (flag_if_conversion)
3015 timevar_push (TV_IFCVT);
3016 open_dump_file (DFI_ce, decl);
3022 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3023 timevar_pop (TV_IFCVT);
3026 /* Register allocation pre-pass, to reduce number of moves
3027 necessary for two-address machines. */
3028 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3030 timevar_push (TV_REGMOVE);
3031 open_dump_file (DFI_regmove, decl);
3033 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3035 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3036 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3037 timevar_pop (TV_REGMOVE);
3042 /* Do unconditional splitting before register allocation to allow machine
3043 description to add extra information not needed previously. */
3044 split_all_insns (1);
3046 /* Any of the several passes since flow1 will have munged register
3047 lifetime data a bit. */
3048 register_life_up_to_date = 0;
3050 #ifdef OPTIMIZE_MODE_SWITCHING
3051 timevar_push (TV_MODE_SWITCH);
3054 optimize_mode_switching (NULL);
3057 timevar_pop (TV_MODE_SWITCH);
3060 timevar_push (TV_SCHED);
3062 #ifdef INSN_SCHEDULING
3064 /* Print function header into sched dump now
3065 because doing the sched analysis makes some of the dump. */
3066 if (optimize > 0 && flag_schedule_insns)
3068 open_dump_file (DFI_sched, decl);
3070 /* Do control and data sched analysis,
3071 and write some of the results to dump file. */
3073 schedule_insns (rtl_dump_file);
3075 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3077 /* Register lifetime information was updated as part of verifying
3079 register_life_up_to_date = 1;
3082 timevar_pop (TV_SCHED);
3086 /* Determine if the current function is a leaf before running reload
3087 since this can impact optimizations done by the prologue and
3088 epilogue thus changing register elimination offsets. */
3089 current_function_is_leaf = leaf_function_p ();
3091 timevar_push (TV_LOCAL_ALLOC);
3092 open_dump_file (DFI_lreg, decl);
3094 /* Allocate pseudo-regs that are used only within 1 basic block.
3096 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3097 jump optimizer after register allocation and reloading are finished. */
3099 if (! register_life_up_to_date)
3100 recompute_reg_usage (insns, ! optimize_size);
3102 /* Allocate the reg_renumber array. */
3103 allocate_reg_info (max_regno, FALSE, TRUE);
3105 /* And the reg_equiv_memory_loc array. */
3106 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3108 allocate_initial_values (reg_equiv_memory_loc);
3110 regclass (insns, max_reg_num (), rtl_dump_file);
3111 rebuild_label_notes_after_reload = local_alloc ();
3113 timevar_pop (TV_LOCAL_ALLOC);
3115 if (dump_file[DFI_lreg].enabled)
3117 timevar_push (TV_DUMP);
3119 dump_flow_info (rtl_dump_file);
3120 dump_local_alloc (rtl_dump_file);
3122 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3123 timevar_pop (TV_DUMP);
3128 timevar_push (TV_GLOBAL_ALLOC);
3129 open_dump_file (DFI_greg, decl);
3131 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3132 pass fixing up any insns that are invalid. */
3135 failure = global_alloc (rtl_dump_file);
3138 build_insn_chain (insns);
3139 failure = reload (insns, 0);
3142 timevar_pop (TV_GLOBAL_ALLOC);
3144 if (dump_file[DFI_greg].enabled)
3146 timevar_push (TV_DUMP);
3148 dump_global_regs (rtl_dump_file);
3150 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3151 timevar_pop (TV_DUMP);
3155 goto exit_rest_of_compilation;
3159 open_dump_file (DFI_postreload, decl);
3161 /* Do a very simple CSE pass over just the hard registers. */
3164 timevar_push (TV_RELOAD_CSE_REGS);
3165 reload_cse_regs (insns);
3166 timevar_pop (TV_RELOAD_CSE_REGS);
3169 /* Register allocation and reloading may have turned an indirect jump into
3170 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3171 jumping instructions. */
3172 if (rebuild_label_notes_after_reload)
3174 timevar_push (TV_JUMP);
3176 rebuild_jump_labels (insns);
3177 purge_all_dead_edges (0);
3179 timevar_pop (TV_JUMP);
3182 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3184 /* Re-create the death notes which were deleted during reload. */
3185 timevar_push (TV_FLOW2);
3186 open_dump_file (DFI_flow2, decl);
3188 #ifdef ENABLE_CHECKING
3189 verify_flow_info ();
3192 /* If optimizing, then go ahead and split insns now. */
3194 split_all_insns (0);
3196 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3198 /* On some machines, the prologue and epilogue code, or parts thereof,
3199 can be represented as RTL. Doing so lets us schedule insns between
3200 it and the rest of the code and also allows delayed branch
3201 scheduling to operate in the epilogue. */
3202 thread_prologue_and_epilogue_insns (insns);
3206 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3207 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3208 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3210 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3211 even for machines with possibly nonzero RETURN_POPS_ARGS
3212 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3213 push instructions will have popping returns. */
3214 #ifndef PUSH_ROUNDING
3215 if (!ACCUMULATE_OUTGOING_ARGS)
3217 combine_stack_adjustments ();
3222 flow2_completed = 1;
3224 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3225 timevar_pop (TV_FLOW2);
3227 #ifdef HAVE_peephole2
3228 if (optimize > 0 && flag_peephole2)
3230 timevar_push (TV_PEEPHOLE2);
3231 open_dump_file (DFI_peephole2, decl);
3233 peephole2_optimize (rtl_dump_file);
3235 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3236 timevar_pop (TV_PEEPHOLE2);
3240 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3242 timevar_push (TV_RENAME_REGISTERS);
3243 open_dump_file (DFI_rnreg, decl);
3245 if (flag_rename_registers)
3246 regrename_optimize ();
3247 if (flag_cprop_registers)
3248 copyprop_hardreg_forward ();
3250 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3251 timevar_pop (TV_RENAME_REGISTERS);
3254 if (flag_if_conversion2)
3256 timevar_push (TV_IFCVT2);
3257 open_dump_file (DFI_ce2, decl);
3261 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3262 timevar_pop (TV_IFCVT2);
3266 split_all_insns (1);
3269 #ifdef INSN_SCHEDULING
3270 if (optimize > 0 && flag_schedule_insns_after_reload)
3272 timevar_push (TV_SCHED2);
3273 open_dump_file (DFI_sched2, decl);
3275 /* Do control and data sched analysis again,
3276 and write some more of the results to dump file. */
3278 split_all_insns (1);
3280 schedule_insns (rtl_dump_file);
3282 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3283 timevar_pop (TV_SCHED2);
3289 #ifdef LEAF_REGISTERS
3290 current_function_uses_only_leaf_regs
3291 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3295 timevar_push (TV_REG_STACK);
3296 open_dump_file (DFI_stack, decl);
3298 reg_to_stack (insns, rtl_dump_file);
3300 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3301 timevar_pop (TV_REG_STACK);
3307 timevar_push (TV_REORDER_BLOCKS);
3308 open_dump_file (DFI_bbro, decl);
3310 /* Last attempt to optimize CFG, as scheduling, peepholing
3311 and insn splitting possibly introduced more crossjumping
3313 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3314 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3315 if (flag_reorder_blocks)
3317 reorder_basic_blocks ();
3318 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3321 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3322 timevar_pop (TV_REORDER_BLOCKS);
3324 compute_alignments ();
3326 /* CFG is no longer maintained up-to-date. */
3327 free_bb_for_insn ();
3329 /* If a machine dependent reorganization is needed, call it. */
3330 #ifdef MACHINE_DEPENDENT_REORG
3331 timevar_push (TV_MACH_DEP);
3332 open_dump_file (DFI_mach, decl);
3334 MACHINE_DEPENDENT_REORG (insns);
3336 close_dump_file (DFI_mach, print_rtl, insns);
3337 timevar_pop (TV_MACH_DEP);
3342 purge_line_number_notes (insns);
3343 cleanup_barriers ();
3345 /* If a scheduling pass for delayed branches is to be done,
3346 call the scheduling code. */
3349 if (optimize > 0 && flag_delayed_branch)
3351 timevar_push (TV_DBR_SCHED);
3352 open_dump_file (DFI_dbr, decl);
3354 dbr_schedule (insns, rtl_dump_file);
3356 close_dump_file (DFI_dbr, print_rtl, insns);
3357 timevar_pop (TV_DBR_SCHED);
3363 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3364 timevar_push (TV_SHORTEN_BRANCH);
3365 split_all_insns_noflow ();
3366 timevar_pop (TV_SHORTEN_BRANCH);
3369 convert_to_eh_region_ranges ();
3371 /* Shorten branches. */
3372 timevar_push (TV_SHORTEN_BRANCH);
3373 shorten_branches (get_insns ());
3374 timevar_pop (TV_SHORTEN_BRANCH);
3376 current_function_nothrow = nothrow_function_p ();
3377 if (current_function_nothrow)
3378 /* Now we know that this can't throw; set the flag for the benefit
3379 of other functions later in this translation unit. */
3380 TREE_NOTHROW (current_function_decl) = 1;
3382 /* Now turn the rtl into assembler code. */
3384 timevar_push (TV_FINAL);
3389 /* Get the function's name, as described by its RTL. This may be
3390 different from the DECL_NAME name used in the source file. */
3392 x = DECL_RTL (decl);
3393 if (GET_CODE (x) != MEM)
3396 if (GET_CODE (x) != SYMBOL_REF)
3398 fnname = XSTR (x, 0);
3400 assemble_start_function (decl, fnname);
3401 final_start_function (insns, asm_out_file, optimize);
3402 final (insns, asm_out_file, optimize, 0);
3403 final_end_function ();
3405 #ifdef IA64_UNWIND_INFO
3406 /* ??? The IA-64 ".handlerdata" directive must be issued before
3407 the ".endp" directive that closes the procedure descriptor. */
3408 output_function_exception_table ();
3411 assemble_end_function (decl, fnname);
3413 #ifndef IA64_UNWIND_INFO
3414 /* Otherwise, it feels unclean to switch sections in the middle. */
3415 output_function_exception_table ();
3419 fflush (asm_out_file);
3421 /* Release all memory allocated by flow. */
3422 free_basic_block_vars (0);
3424 /* Release all memory held by regsets now. */
3425 regset_release_memory ();
3427 timevar_pop (TV_FINAL);
3431 /* Write DBX symbols if requested. */
3433 /* Note that for those inline functions where we don't initially
3434 know for certain that we will be generating an out-of-line copy,
3435 the first invocation of this routine (rest_of_compilation) will
3436 skip over this code by doing a `goto exit_rest_of_compilation;'.
3437 Later on, finish_compilation will call rest_of_compilation again
3438 for those inline functions that need to have out-of-line copies
3439 generated. During that call, we *will* be routed past here. */
3441 timevar_push (TV_SYMOUT);
3442 (*debug_hooks->function_decl) (decl);
3443 timevar_pop (TV_SYMOUT);
3445 exit_rest_of_compilation:
3447 /* In case the function was not output,
3448 don't leave any temporary anonymous types
3449 queued up for sdb output. */
3450 #ifdef SDB_DEBUGGING_INFO
3451 if (write_symbols == SDB_DEBUG)
3452 sdbout_types (NULL_TREE);
3455 reload_completed = 0;
3456 flow2_completed = 0;
3459 timevar_push (TV_FINAL);
3461 /* Clear out the insn_length contents now that they are no
3463 init_insn_lengths ();
3465 /* Clear out the real_constant_chain before some of the rtx's
3466 it runs through become garbage. */
3467 clear_const_double_mem ();
3469 /* Show no temporary slots allocated. */
3472 free_basic_block_vars (0);
3473 free_bb_for_insn ();
3475 timevar_pop (TV_FINAL);
3477 /* Make sure volatile mem refs aren't considered valid operands for
3478 arithmetic insns. We must call this here if this is a nested inline
3479 function, since the above code leaves us in the init_recog state
3480 (from final.c), and the function context push/pop code does not
3481 save/restore volatile_ok.
3483 ??? Maybe it isn't necessary for expand_start_function to call this
3484 anymore if we do it here? */
3486 init_recog_no_volatile ();
3488 /* We're done with this function. Free up memory if we can. */
3489 free_after_parsing (cfun);
3490 if (! DECL_DEFER_OUTPUT (decl))
3492 free_after_compilation (cfun);
3494 /* Clear integrate.c's pointer to the cfun structure we just
3496 DECL_SAVED_INSNS (decl) = 0;
3502 timevar_pop (TV_REST_OF_COMPILATION);
3512 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3513 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3514 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3515 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3516 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3517 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"));
3519 for (i = ARRAY_SIZE (f_options); i--;)
3521 const char *description = f_options[i].description;
3523 if (description != NULL && * description != 0)
3524 printf (" -f%-21s %s\n",
3525 f_options[i].string, _(description));
3528 printf (_(" -O[number] Set optimization level to [number]\n"));
3529 printf (_(" -Os Optimize for space rather than speed\n"));
3530 for (i = LAST_PARAM; i--;)
3532 const char *description = compiler_params[i].help;
3533 const int length = 21-strlen(compiler_params[i].option);
3535 if (description != NULL && * description != 0)
3536 printf (" --param %s=<value>%.*s%s\n",
3537 compiler_params[i].option,
3538 length > 0 ? length : 1, " ",
3541 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3542 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3543 printf (_(" -w Suppress warnings\n"));
3544 printf (_(" -W Enable extra warnings\n"));
3546 for (i = ARRAY_SIZE (W_options); i--;)
3548 const char *description = W_options[i].description;
3550 if (description != NULL && * description != 0)
3551 printf (" -W%-21s %s\n",
3552 W_options[i].string, _(description));
3555 printf (_(" -Wunused Enable unused warnings\n"));
3556 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3557 printf (_(" -p Enable function profiling\n"));
3558 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3559 printf (_(" -a Enable block profiling \n"));
3561 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3562 printf (_(" -ax Enable jump profiling \n"));
3564 printf (_(" -o <file> Place output into <file> \n"));
3566 -G <number> Put global and static data smaller than <number>\n\
3567 bytes into a special section (on some targets)\n"));
3569 for (i = ARRAY_SIZE (debug_args); i--;)
3571 if (debug_args[i].description != NULL)
3572 printf (" -g%-21s %s\n",
3573 debug_args[i].arg, _(debug_args[i].description));
3576 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3577 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3578 printf (_(" -version Display the compiler's version\n"));
3579 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3580 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3581 #if defined INSN_SCHEDULING
3582 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3584 printf (_(" --help Display this information\n"));
3589 /* Display descriptions of language specific options.
3590 If there is no description, note that there is an undocumented option.
3591 If the description is empty, do not display anything. (This allows
3592 options to be deliberately undocumented, for whatever reason).
3593 If the option string is missing, then this is a marker, indicating
3594 that the description string is in fact the name of a language, whose
3595 language specific options are to follow. */
3597 if (ARRAY_SIZE (documented_lang_options) > 1)
3599 printf (_("\nLanguage specific options:\n"));
3601 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3603 const char *description = documented_lang_options[i].description;
3604 const char *option = documented_lang_options[i].option;
3606 if (description == NULL)
3611 printf (_(" %-23.23s [undocumented]\n"), option);
3613 else if (*description == 0)
3615 else if (option == NULL)
3619 (_("\nThere are undocumented %s specific options as well.\n"),
3623 printf (_("\n Options for %s:\n"), description);
3628 printf (" %-23.23s %s\n", option, _(description));
3633 printf (_("\nThere are undocumented %s specific options as well.\n"),
3636 display_target_options ();
3640 display_target_options ()
3643 static bool displayed = false;
3645 /* Avoid double printing for --help --target-help. */
3650 if (ARRAY_SIZE (target_switches) > 1
3651 #ifdef TARGET_OPTIONS
3652 || ARRAY_SIZE (target_options) > 1
3660 printf (_("\nTarget specific options:\n"));
3662 for (i = ARRAY_SIZE (target_switches); i--;)
3664 const char *option = target_switches[i].name;
3665 const char *description = target_switches[i].description;
3667 if (option == NULL || *option == 0)
3669 else if (description == NULL)
3674 printf (_(" -m%-23.23s [undocumented]\n"), option);
3676 else if (* description != 0)
3677 doc += printf (" -m%-23.23s %s\n", option, _(description));
3680 #ifdef TARGET_OPTIONS
3681 for (i = ARRAY_SIZE (target_options); i--;)
3683 const char *option = target_options[i].prefix;
3684 const char *description = target_options[i].description;
3686 if (option == NULL || *option == 0)
3688 else if (description == NULL)
3693 printf (_(" -m%-23.23s [undocumented]\n"), option);
3695 else if (* description != 0)
3696 doc += printf (" -m%-23.23s %s\n", option, _(description));
3702 printf (_("\nThere are undocumented target specific options as well.\n"));
3704 printf (_(" They exist, but they are not documented.\n"));
3709 /* Parse a -d... command line switch. */
3712 decode_d_option (arg)
3721 for (i = 0; i < (int) DFI_MAX; ++i)
3722 dump_file[i].enabled = 1;
3728 flag_print_asm_name = 1;
3731 flag_dump_rtl_in_asm = 1;
3732 flag_print_asm_name = 1;
3735 graph_dump_format = vcg;
3738 rtl_dump_and_exit = 1;
3743 case 'D': /* These are handled by the preprocessor. */
3749 for (i = 0; i < (int) DFI_MAX; ++i)
3750 if (c == dump_file[i].debug_switch)
3752 dump_file[i].enabled = 1;
3757 warning ("unrecognized gcc debugging option: %c", c);
3762 /* Parse a -f... command line switch. ARG is the value after the -f.
3763 It is safe to access 'ARG - 2' to generate the full switch name.
3764 Return the number of strings consumed. */
3767 decode_f_option (arg)
3771 const char *option_value = NULL;
3773 /* Search for the option in the table of binary f options. */
3774 for (j = ARRAY_SIZE (f_options); j--;)
3776 if (!strcmp (arg, f_options[j].string))
3778 *f_options[j].variable = f_options[j].on_value;
3782 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3783 && ! strcmp (arg + 3, f_options[j].string))
3785 *f_options[j].variable = ! f_options[j].on_value;
3790 if (!strcmp (arg, "fast-math"))
3791 set_fast_math_flags ();
3792 else if (!strcmp (arg, "no-fast-math"))
3793 set_no_fast_math_flags ();
3794 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3795 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3798 read_integral_parameter (option_value, arg - 2,
3800 set_param_value ("max-inline-insns", val);
3802 #ifdef INSN_SCHEDULING
3803 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3804 fix_sched_param ("verbose", option_value);
3806 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3807 fix_register (option_value, 1, 1);
3808 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3809 fix_register (option_value, 0, 1);
3810 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3811 fix_register (option_value, 0, 0);
3812 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3813 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3814 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3816 = read_integral_parameter (option_value, arg - 2, align_functions);
3817 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3818 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3819 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3821 = read_integral_parameter (option_value, arg - 2, align_labels);
3822 else if ((option_value
3823 = skip_leading_substring (arg, "stack-limit-register=")))
3825 int reg = decode_reg_name (option_value);
3827 error ("unrecognized register name `%s'", option_value);
3829 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3831 else if ((option_value
3832 = skip_leading_substring (arg, "stack-limit-symbol=")))
3835 nm = ggc_strdup (option_value);
3836 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3838 else if ((option_value
3839 = skip_leading_substring (arg, "message-length=")))
3840 output_set_maximum_length
3841 (&global_dc->buffer, read_integral_parameter
3842 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3843 else if ((option_value
3844 = skip_leading_substring (arg, "diagnostics-show-location=")))
3846 if (!strcmp (option_value, "once"))
3847 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3848 else if (!strcmp (option_value, "every-line"))
3849 diagnostic_prefixing_rule (global_dc)
3850 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3852 error ("unrecognized option `%s'", arg - 2);
3854 else if (!strcmp (arg, "no-stack-limit"))
3855 stack_limit_rtx = NULL_RTX;
3856 else if (!strcmp (arg, "preprocessed"))
3857 /* Recognise this switch but do nothing. This prevents warnings
3858 about an unrecognized switch if cpplib has not been linked in. */
3866 /* Parse a -W... command line switch. ARG is the value after the -W.
3867 It is safe to access 'ARG - 2' to generate the full switch name.
3868 Return the number of strings consumed. */
3871 decode_W_option (arg)
3874 const char *option_value = NULL;
3877 /* Search for the option in the table of binary W options. */
3879 for (j = ARRAY_SIZE (W_options); j--;)
3881 if (!strcmp (arg, W_options[j].string))
3883 *W_options[j].variable = W_options[j].on_value;
3887 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3888 && ! strcmp (arg + 3, W_options[j].string))
3890 *W_options[j].variable = ! W_options[j].on_value;
3895 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3896 warning ("-Wid-clash-LEN is no longer supported");
3897 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3899 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3901 warn_larger_than = larger_than_size != -1;
3903 else if (!strcmp (arg, "unused"))
3907 else if (!strcmp (arg, "no-unused"))
3917 /* Parse a -g... command line switch. ARG is the value after the -g.
3918 It is safe to access 'ARG - 2' to generate the full switch name.
3919 Return the number of strings consumed. */
3922 decode_g_option (arg)
3925 static unsigned level=0;
3926 /* A lot of code assumes write_symbols == NO_DEBUG if the
3927 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3928 of what debugging type has been selected). This records the
3929 selected type. It is an error to specify more than one
3931 static enum debug_info_type selected_debug_type = NO_DEBUG;
3932 /* Non-zero if debugging format has been explicitly set.
3933 -g and -ggdb don't explicitly set the debugging format so
3934 -gdwarf -g3 is equivalent to -gdwarf3. */
3935 static int type_explicitly_set_p = 0;
3936 /* Indexed by enum debug_info_type. */
3937 static const char *const debug_type_names[] =
3939 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3942 /* The maximum admissible debug level value. */
3943 static const unsigned max_debug_level = 3;
3945 /* Look up ARG in the table. */
3946 for (da = debug_args; da->arg; da++)
3948 const int da_len = strlen (da->arg);
3950 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3952 enum debug_info_type type = da->debug_type;
3953 const char *p = arg + da_len;
3955 if (*p && ! ISDIGIT (*p))
3958 /* A debug flag without a level defaults to level 2.
3959 Note we do not want to call read_integral_parameter
3960 for that case since it will call atoi which
3963 ??? We may want to generalize the interface to
3964 read_integral_parameter to better handle this case
3965 if this case shows up often. */
3967 level = read_integral_parameter (p, 0, max_debug_level + 1);
3969 level = (level == 0) ? 2 : level;
3971 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
3973 error ("use -gdwarf -g%d for DWARF v1, level %d",
3976 error ("use -gdwarf-2 for DWARF v2");
3979 if (level > max_debug_level)
3982 ignoring option `%s' due to invalid debug level specification",
3984 level = debug_info_level;
3987 if (type == NO_DEBUG)
3989 type = PREFERRED_DEBUGGING_TYPE;
3991 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
3993 #ifdef DWARF2_DEBUGGING_INFO
3994 type = DWARF2_DEBUG;
3996 #ifdef DBX_DEBUGGING_INFO
4003 if (type == NO_DEBUG)
4004 warning ("`%s': unknown or unsupported -g option", arg - 2);
4006 /* Does it conflict with an already selected type? */
4007 if (type_explicitly_set_p
4008 /* -g/-ggdb don't conflict with anything. */
4009 && da->debug_type != NO_DEBUG
4010 && type != selected_debug_type)
4011 warning ("`%s' ignored, conflicts with `-g%s'",
4012 arg - 2, debug_type_names[(int) selected_debug_type]);
4015 /* If the format has already been set, -g/-ggdb
4016 only change the debug level. */
4017 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4018 /* Don't change debugging type. */
4022 selected_debug_type = type;
4023 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4026 write_symbols = (level == 0
4028 : selected_debug_type);
4029 use_gnu_debug_info_extensions = da->use_extensions_p;
4030 debug_info_level = (enum debug_info_level) level;
4043 /* Decode the first argument in the argv as a language-independent option.
4044 Return the number of strings consumed. */
4047 independent_decode_option (argc, argv)
4051 char *arg = argv[0];
4053 if (arg[0] != '-' || arg[1] == 0)
4065 if (!strcmp (arg, "-help"))
4068 exit_after_options = 1;
4071 if (!strcmp (arg, "-target-help"))
4073 display_target_options ();
4074 exit_after_options = 1;
4077 if (!strcmp (arg, "-version"))
4079 print_version (stderr, "");
4080 exit_after_options = 1;
4083 /* Handle '--param <name>=<value>'. */
4084 if (strcmp (arg, "-param") == 0)
4090 error ("-param option missing argument");
4094 /* Get the '<name>=<value>' parameter. */
4096 /* Look for the `='. */
4097 equal = strchr (arg, '=');
4099 error ("invalid --param option: %s", arg);
4104 /* Zero out the `=' sign so that we get two separate strings. */
4106 /* Figure out what value is specified. */
4107 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4108 if (val != INVALID_PARAM_VAL)
4109 set_param_value (arg, val);
4111 error ("invalid parameter value `%s'", equal + 1);
4126 /* Already been treated in main (). Do nothing. */
4130 set_target_switch (arg + 1);
4134 return decode_f_option (arg + 1);
4137 return decode_g_option (arg + 1);
4140 if (!strcmp (arg, "dumpbase"))
4145 dump_base_name = argv[1];
4149 decode_d_option (arg + 1);
4153 if (!strcmp (arg, "pedantic"))
4155 else if (!strcmp (arg, "pedantic-errors"))
4156 flag_pedantic_errors = pedantic = 1;
4157 else if (arg[1] == 0)
4164 if (!strcmp (arg, "quiet"))
4171 if (!strcmp (arg, "version"))
4179 inhibit_warnings = 1;
4188 /* We save the value of warn_uninitialized, since if they put
4189 -Wuninitialized on the command line, we need to generate a
4190 warning about not using it without also specifying -O. */
4191 if (warn_uninitialized != 1)
4192 warn_uninitialized = 2;
4195 return decode_W_option (arg + 1);
4199 if (!strncmp (arg, "aux-info", 8))
4206 aux_info_file_name = argv[1];
4207 flag_gen_aux_info = 1;
4210 else if (arg[8] == '=')
4212 aux_info_file_name = arg + 9;
4213 flag_gen_aux_info = 1;
4228 asm_file_name = argv[1];
4243 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4248 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4252 if (g_switch_val == -1)
4256 g_switch_set = TRUE;
4257 g_switch_value = g_switch_val;
4267 /* Decode -m switches. */
4268 /* Decode the switch -mNAME. */
4271 set_target_switch (name)
4275 int valid_target_option = 0;
4277 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4278 if (!strcmp (target_switches[j].name, name))
4280 if (target_switches[j].value < 0)
4281 target_flags &= ~-target_switches[j].value;
4283 target_flags |= target_switches[j].value;
4284 valid_target_option = 1;
4287 #ifdef TARGET_OPTIONS
4288 if (!valid_target_option)
4289 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4291 int len = strlen (target_options[j].prefix);
4292 if (!strncmp (target_options[j].prefix, name, len))
4294 *target_options[j].variable = name + len;
4295 valid_target_option = 1;
4300 if (!valid_target_option)
4301 error ("invalid option `%s'", name);
4304 /* Print version information to FILE.
4305 Each line begins with INDENT (for the case where FILE is the
4306 assembler output file). */
4309 print_version (file, indent)
4314 #define __VERSION__ "[?]"
4318 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4320 "%s%s%s version %s (%s) compiled by CC.\n"
4322 , indent, *indent != 0 ? " " : "",
4323 lang_hooks.name, version_string, TARGET_NAME,
4324 indent, __VERSION__);
4327 /* Print an option value and return the adjusted position in the line.
4328 ??? We don't handle error returns from fprintf (disk full); presumably
4329 other code will catch a disk full though. */
4332 print_single_switch (file, pos, max, indent, sep, term, type, name)
4335 const char *indent, *sep, *term, *type, *name;
4337 /* The ultrix fprintf returns 0 on success, so compute the result we want
4338 here since we need it for the following test. */
4339 int len = strlen (sep) + strlen (type) + strlen (name);
4344 fprintf (file, "%s", term);
4349 fprintf (file, "%s", indent);
4350 pos = strlen (indent);
4352 fprintf (file, "%s%s%s", sep, type, name);
4357 /* Print active target switches to FILE.
4358 POS is the current cursor position and MAX is the size of a "line".
4359 Each line begins with INDENT and ends with TERM.
4360 Each switch is separated from the next by SEP. */
4363 print_switch_values (file, pos, max, indent, sep, term)
4366 const char *indent, *sep, *term;
4371 /* Print the options as passed. */
4373 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4374 _("options passed: "), "");
4376 for (p = &save_argv[1]; *p != NULL; p++)
4380 if (strcmp (*p, "-o") == 0)
4386 if (strcmp (*p, "-quiet") == 0)
4388 if (strcmp (*p, "-version") == 0)
4393 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4396 fprintf (file, "%s", term);
4398 /* Print the -f and -m options that have been enabled.
4399 We don't handle language specific options but printing argv
4402 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4403 _("options enabled: "), "");
4405 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4406 if (*f_options[j].variable == f_options[j].on_value)
4407 pos = print_single_switch (file, pos, max, indent, sep, term,
4408 "-f", f_options[j].string);
4410 /* Print target specific options. */
4412 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4413 if (target_switches[j].name[0] != '\0'
4414 && target_switches[j].value > 0
4415 && ((target_switches[j].value & target_flags)
4416 == target_switches[j].value))
4418 pos = print_single_switch (file, pos, max, indent, sep, term,
4419 "-m", target_switches[j].name);
4422 #ifdef TARGET_OPTIONS
4423 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4424 if (*target_options[j].variable != NULL)
4427 sprintf (prefix, "-m%s", target_options[j].prefix);
4428 pos = print_single_switch (file, pos, max, indent, sep, term,
4429 prefix, *target_options[j].variable);
4433 fprintf (file, "%s", term);
4436 /* Open assembly code output file. Do this even if -fsyntax-only is
4437 on, because then the driver will have provided the name of a
4438 temporary file or bit bucket for us. NAME is the file specified on
4439 the command line, possibly NULL. */
4441 init_asm_output (name)
4444 if (name == NULL && asm_file_name == 0)
4445 asm_out_file = stdout;
4448 if (asm_file_name == 0)
4450 int len = strlen (dump_base_name);
4451 char *dumpname = (char *) xmalloc (len + 6);
4452 memcpy (dumpname, dump_base_name, len + 1);
4453 strip_off_ending (dumpname, len);
4454 strcat (dumpname, ".s");
4455 asm_file_name = dumpname;
4457 if (!strcmp (asm_file_name, "-"))
4458 asm_out_file = stdout;
4460 asm_out_file = fopen (asm_file_name, "w");
4461 if (asm_out_file == 0)
4462 fatal_io_error ("can't open %s for writing", asm_file_name);
4465 #ifdef IO_BUFFER_SIZE
4466 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4467 _IOFBF, IO_BUFFER_SIZE);
4470 if (!flag_syntax_only)
4472 #ifdef ASM_FILE_START
4473 ASM_FILE_START (asm_out_file);
4476 #ifdef ASM_COMMENT_START
4477 if (flag_verbose_asm)
4479 /* Print the list of options in effect. */
4480 print_version (asm_out_file, ASM_COMMENT_START);
4481 print_switch_values (asm_out_file, 0, MAX_LINE,
4482 ASM_COMMENT_START, " ", "\n");
4483 /* Add a blank line here so it appears in assembler output but not
4485 fprintf (asm_out_file, "\n");
4491 /* Initialization of the front end environment, before command line
4492 options are parsed. Signal handlers, internationalization etc.
4493 ARGV0 is main's argv[0]. */
4495 general_init (argv0)
4500 p = argv0 + strlen (argv0);
4501 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4505 xmalloc_set_program_name (progname);
4507 gcc_init_libintl ();
4509 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4511 signal (SIGSEGV, crash_signal);
4514 signal (SIGILL, crash_signal);
4517 signal (SIGBUS, crash_signal);
4520 signal (SIGABRT, crash_signal);
4522 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4523 signal (SIGIOT, crash_signal);
4526 signal (SIGFPE, crash_signal);
4529 /* Initialize the diagnostics reporting machinery, so option parsing
4530 can give warnings and errors. */
4531 diagnostic_initialize (global_dc);
4534 /* Parse command line options and set default flag values, called
4535 after language-independent option-independent initialization. Do
4536 minimal options processing. Outputting diagnostics is OK, but GC
4537 and identifier hashtables etc. are not initialized yet. */
4539 parse_options_and_default_flags (argc, argv)
4545 /* Save in case md file wants to emit args as a comment. */
4549 /* Initialize register usage now so switches may override. */
4552 /* Register the language-independent parameters. */
4553 add_params (lang_independent_params, LAST_PARAM);
4555 /* Perform language-specific options initialization. */
4556 (*lang_hooks.init_options) ();
4558 /* Scan to see what optimization level has been specified. That will
4559 determine the default value of many flags. */
4560 for (i = 1; i < argc; i++)
4562 if (!strcmp (argv[i], "-O"))
4567 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4569 /* Handle -Os, -O2, -O3, -O69, ... */
4570 char *p = &argv[i][2];
4572 if ((p[0] == 's') && (p[1] == 0))
4576 /* Optimizing for size forces optimize to be 2. */
4581 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4582 if (optimize_val != -1)
4584 optimize = optimize_val;
4593 flag_merge_constants = 0;
4599 flag_thread_jumps = 1;
4601 flag_delayed_branch = 1;
4603 #ifdef CAN_DEBUG_WITHOUT_FP
4604 flag_omit_frame_pointer = 1;
4606 flag_guess_branch_prob = 1;
4607 flag_cprop_registers = 1;
4608 flag_loop_optimize = 1;
4609 flag_crossjumping = 1;
4610 flag_if_conversion = 1;
4611 flag_if_conversion2 = 1;
4616 flag_optimize_sibling_calls = 1;
4617 flag_cse_follow_jumps = 1;
4618 flag_cse_skip_blocks = 1;
4620 flag_expensive_optimizations = 1;
4621 flag_strength_reduce = 1;
4622 flag_rerun_cse_after_loop = 1;
4623 flag_rerun_loop_opt = 1;
4624 flag_caller_saves = 1;
4627 #ifdef INSN_SCHEDULING
4628 flag_schedule_insns = 1;
4629 flag_schedule_insns_after_reload = 1;
4632 flag_strict_aliasing = 1;
4633 flag_delete_null_pointer_checks = 1;
4634 flag_reorder_blocks = 1;
4639 flag_inline_functions = 1;
4640 flag_rename_registers = 1;
4643 if (optimize < 2 || optimize_size)
4648 align_functions = 1;
4651 /* Initialize whether `char' is signed. */
4652 flag_signed_char = DEFAULT_SIGNED_CHAR;
4653 #ifdef DEFAULT_SHORT_ENUMS
4654 /* Initialize how much space enums occupy, by default. */
4655 flag_short_enums = DEFAULT_SHORT_ENUMS;
4658 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4661 set_target_switch ("");
4663 /* Unwind tables are always present in an ABI-conformant IA-64
4664 object file, so the default should be ON. */
4665 #ifdef IA64_UNWIND_INFO
4666 flag_unwind_tables = IA64_UNWIND_INFO;
4669 #ifdef OPTIMIZATION_OPTIONS
4670 /* Allow default optimizations to be specified on a per-machine basis. */
4671 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4674 /* Perform normal command line switch decoding. */
4675 for (i = 1; i < argc;)
4678 int indep_processed;
4680 /* Give the language a chance to decode the option for itself. */
4681 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4683 if (lang_processed >= 0)
4684 /* Now see if the option also has a language independent meaning.
4685 Some options are both language specific and language independent,
4687 indep_processed = independent_decode_option (argc - i, argv + i);
4690 lang_processed = -lang_processed;
4691 indep_processed = 0;
4694 if (lang_processed || indep_processed)
4695 i += MAX (lang_processed, indep_processed);
4698 const char *option = NULL;
4699 const char *lang = NULL;
4702 /* It is possible that the command line switch is not valid for the
4703 current language, but it is valid for another language. In order
4704 to be compatible with previous versions of the compiler (which
4705 did not issue an error message in this case) we check for this
4706 possibility here. If we do find a match, then if extra_warnings
4707 is set we generate a warning message, otherwise we will just
4708 ignore the option. */
4709 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4711 option = documented_lang_options[j].option;
4714 lang = documented_lang_options[j].description;
4715 else if (! strncmp (argv[i], option, strlen (option)))
4719 if (j != ARRAY_SIZE (documented_lang_options))
4723 warning ("ignoring command line option '%s'", argv[i]);
4726 ("(it is valid for %s but not the selected language)",
4730 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4731 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4733 error ("unrecognized option `%s'", argv[i]);
4739 if (flag_no_inline == 2)
4742 flag_really_no_inline = flag_no_inline;
4744 /* Set flag_no_inline before the post_options () hook. The C front
4745 ends use it to determine tree inlining defaults. FIXME: such
4746 code should be lang-independent when all front ends use tree
4747 inlining, in which case it, and this condition, should be moved
4748 to the top of process_options() instead. */
4751 /* Inlining does not work if not optimizing,
4752 so force it not to be done. */
4756 /* The c_decode_option function and decode_option hook set
4757 this to `2' if -Wall is used, so we can avoid giving out
4758 lots of errors for people who don't realize what -Wall does. */
4759 if (warn_uninitialized == 1)
4760 warning ("-Wuninitialized is not supported without -O");
4763 if (flag_really_no_inline == 2)
4764 flag_really_no_inline = flag_no_inline;
4766 /* All command line options have been parsed; allow the front end to
4767 perform consistency checks, etc. */
4768 (*lang_hooks.post_options) ();
4771 /* Process the options that have been parsed. */
4775 #ifdef OVERRIDE_OPTIONS
4776 /* Some machines may reject certain combinations of options. */
4780 /* Set up the align_*_log variables, defaulting them to 1 if they
4781 were still unset. */
4782 if (align_loops <= 0) align_loops = 1;
4783 if (align_loops_max_skip > align_loops || !align_loops)
4784 align_loops_max_skip = align_loops - 1;
4785 align_loops_log = floor_log2 (align_loops * 2 - 1);
4786 if (align_jumps <= 0) align_jumps = 1;
4787 if (align_jumps_max_skip > align_jumps || !align_jumps)
4788 align_jumps_max_skip = align_jumps - 1;
4789 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4790 if (align_labels <= 0) align_labels = 1;
4791 align_labels_log = floor_log2 (align_labels * 2 - 1);
4792 if (align_labels_max_skip > align_labels || !align_labels)
4793 align_labels_max_skip = align_labels - 1;
4794 if (align_functions <= 0) align_functions = 1;
4795 align_functions_log = floor_log2 (align_functions * 2 - 1);
4797 /* Unrolling all loops implies that standard loop unrolling must also
4799 if (flag_unroll_all_loops)
4800 flag_unroll_loops = 1;
4801 /* Loop unrolling requires that strength_reduction be on also. Silently
4802 turn on strength reduction here if it isn't already on. Also, the loop
4803 unrolling code assumes that cse will be run after loop, so that must
4804 be turned on also. */
4805 if (flag_unroll_loops)
4807 flag_strength_reduce = 1;
4808 flag_rerun_cse_after_loop = 1;
4811 if (flag_non_call_exceptions)
4812 flag_asynchronous_unwind_tables = 1;
4813 if (flag_asynchronous_unwind_tables)
4814 flag_unwind_tables = 1;
4816 /* Warn about options that are not supported on this machine. */
4817 #ifndef INSN_SCHEDULING
4818 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4819 warning ("instruction scheduling not supported on this target machine");
4822 if (flag_delayed_branch)
4823 warning ("this target machine does not have delayed branches");
4826 /* Some operating systems do not allow profiling without a frame
4828 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4830 && flag_omit_frame_pointer)
4832 error ("profiling does not work without a frame pointer");
4833 flag_omit_frame_pointer = 0;
4836 user_label_prefix = USER_LABEL_PREFIX;
4837 if (flag_leading_underscore != -1)
4839 /* If the default prefix is more complicated than "" or "_",
4840 issue a warning and ignore this option. */
4841 if (user_label_prefix[0] == 0 ||
4842 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4844 user_label_prefix = flag_leading_underscore ? "_" : "";
4847 warning ("-f%sleading-underscore not supported on this target machine",
4848 flag_leading_underscore ? "" : "no-");
4851 /* If we are in verbose mode, write out the version and maybe all the
4852 option flags in use. */
4855 print_version (stderr, "");
4857 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4863 if (flag_syntax_only)
4865 write_symbols = NO_DEBUG;
4869 /* Now we know write_symbols, set up the debug hooks based on it.
4870 By default we do nothing for debug output. */
4871 #if defined(DBX_DEBUGGING_INFO)
4872 if (write_symbols == DBX_DEBUG)
4873 debug_hooks = &dbx_debug_hooks;
4875 #if defined(XCOFF_DEBUGGING_INFO)
4876 if (write_symbols == XCOFF_DEBUG)
4877 debug_hooks = &xcoff_debug_hooks;
4879 #ifdef SDB_DEBUGGING_INFO
4880 if (write_symbols == SDB_DEBUG)
4881 debug_hooks = &sdb_debug_hooks;
4883 #ifdef DWARF_DEBUGGING_INFO
4884 if (write_symbols == DWARF_DEBUG)
4885 debug_hooks = &dwarf_debug_hooks;
4887 #ifdef DWARF2_DEBUGGING_INFO
4888 if (write_symbols == DWARF2_DEBUG)
4889 debug_hooks = &dwarf2_debug_hooks;
4891 #ifdef VMS_DEBUGGING_INFO
4892 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4893 debug_hooks = &vmsdbg_debug_hooks;
4896 /* If auxiliary info generation is desired, open the output file.
4897 This goes in the same directory as the source file--unlike
4898 all the other output files. */
4899 if (flag_gen_aux_info)
4901 aux_info_file = fopen (aux_info_file_name, "w");
4902 if (aux_info_file == 0)
4903 fatal_io_error ("can't open %s", aux_info_file_name);
4906 if (! targetm.have_named_sections)
4908 if (flag_function_sections)
4910 warning ("-ffunction-sections not supported for this target");
4911 flag_function_sections = 0;
4913 if (flag_data_sections)
4915 warning ("-fdata-sections not supported for this target");
4916 flag_data_sections = 0;
4920 if (flag_function_sections && profile_flag)
4922 warning ("-ffunction-sections disabled; it makes profiling impossible");
4923 flag_function_sections = 0;
4926 #ifndef HAVE_prefetch
4927 if (flag_prefetch_loop_arrays)
4929 warning ("-fprefetch-loop-arrays not supported for this target");
4930 flag_prefetch_loop_arrays = 0;
4933 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4935 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4936 flag_prefetch_loop_arrays = 0;
4940 /* This combination of options isn't handled for i386 targets and doesn't
4941 make much sense anyway, so don't allow it. */
4942 if (flag_prefetch_loop_arrays && optimize_size)
4944 warning ("-fprefetch-loop-arrays is not supported with -Os");
4945 flag_prefetch_loop_arrays = 0;
4948 #ifndef OBJECT_FORMAT_ELF
4949 if (flag_function_sections && write_symbols != NO_DEBUG)
4950 warning ("-ffunction-sections may affect debugging on some targets");
4954 /* Language-independent initialization, before language-dependent
4957 lang_independent_init ()
4959 /* Initialize the garbage-collector, and string pools. */
4961 ggc_add_rtx_root (&stack_limit_rtx, 1);
4962 ggc_add_tree_root (¤t_function_decl, 1);
4963 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4968 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4969 || debug_info_level == DINFO_LEVEL_VERBOSE
4970 #ifdef VMS_DEBUGGING_INFO
4971 /* Enable line number info for traceback */
4972 || debug_info_level > DINFO_LEVEL_NONE
4974 || flag_test_coverage
4975 || warn_notreached);
4981 init_function_once ();
4982 init_stor_layout_once ();
4983 init_varasm_once ();
4984 init_EXPR_INSN_LIST_cache ();
4986 /* The following initialization functions need to generate rtl, so
4987 provide a dummy function context for them. */
4988 init_dummy_function_start ();
4991 if (flag_caller_saves)
4992 init_caller_save ();
4993 expand_dummy_function_end ();
4996 /* Language-dependent initialization. Returns non-zero on success. */
4998 lang_dependent_init (name)
5001 if (dump_base_name == 0)
5002 dump_base_name = name ? name : "gccdump";
5004 /* Front-end initialization. This hook can assume that GC,
5005 identifier hashes etc. are set up, but debug initialization is
5006 not done yet. This routine must return the original filename
5007 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5008 name = (*lang_hooks.init) (name);
5012 /* Is this duplication necessary? */
5013 name = ggc_strdup (name);
5014 main_input_filename = input_filename = name;
5015 init_asm_output (name);
5017 /* These create various _DECL nodes, so need to be called after the
5018 front end is initialized. */
5022 /* Put an entry on the input file stack for the main input file. */
5023 push_srcloc (input_filename, 0);
5025 /* If dbx symbol table desired, initialize writing it and output the
5026 predefined types. */
5027 timevar_push (TV_SYMOUT);
5029 #ifdef DWARF2_UNWIND_INFO
5030 if (dwarf2out_do_frame ())
5031 dwarf2out_frame_init ();
5034 /* Now we have the correct original filename, we can initialize
5036 (*debug_hooks->init) (name);
5038 timevar_pop (TV_SYMOUT);
5043 /* Clean up: close opened files, etc. */
5048 /* Close the dump files. */
5049 if (flag_gen_aux_info)
5051 fclose (aux_info_file);
5053 unlink (aux_info_file_name);
5056 /* Close non-debugging input and output files. Take special care to note
5057 whether fclose returns an error, since the pages might still be on the
5058 buffer chain while the file is open. */
5062 if (ferror (asm_out_file) != 0)
5063 fatal_io_error ("error writing to %s", asm_file_name);
5064 if (fclose (asm_out_file) != 0)
5065 fatal_io_error ("error closing %s", asm_file_name);
5068 /* Do whatever is necessary to finish printing the graphs. */
5069 if (graph_dump_format != no_graph)
5073 for (i = 0; i < (int) DFI_MAX; ++i)
5074 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5079 sprintf (seq, DUMPFILE_FORMAT, i);
5080 suffix = concat (seq, dump_file[i].extension, NULL);
5081 finish_graph_dump_file (dump_base_name, suffix);
5088 ggc_print_statistics ();
5089 stringpool_statistics ();
5090 dump_tree_statistics ();
5093 /* Free up memory for the benefit of leak detectors. */
5096 /* Language-specific end of compilation actions. */
5097 (*lang_hooks.finish) ();
5100 /* Initialize the compiler, and compile the input file. */
5104 /* The bulk of command line switch processing. */
5107 /* We cannot start timing until after options are processed since that
5108 says if we run timers or not. */
5110 timevar_start (TV_TOTAL);
5112 /* Language-independent initialization. Also sets up GC, identifier
5114 lang_independent_init ();
5116 /* Language-dependent initialization. Returns true on success. */
5117 if (lang_dependent_init (filename))
5122 /* Stop timing and print the times. */
5123 timevar_stop (TV_TOTAL);
5124 timevar_print (stderr);
5127 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5128 Decode command args, then call compile_file.
5129 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5130 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5132 It is not safe to call this function more than once. */
5135 toplev_main (argc, argv)
5141 /* Initialization of GCC's environment, and diagnostics. */
5142 general_init (argv [0]);
5144 /* Parse the options and do minimal processing; basically just
5145 enough to default flags appropriately. */
5146 parse_options_and_default_flags (argc, argv);
5148 /* Exit early if we can (e.g. -help). */
5149 if (!exit_after_options)
5152 if (errorcount || sorrycount)
5153 return (FATAL_EXIT_CODE);
5155 return (SUCCESS_EXIT_CODE);