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 {"profile", &profile_flag, 1,
1069 N_("Enable basic program profiling code") },
1070 {"reorder-blocks", &flag_reorder_blocks, 1,
1071 N_("Reorder basic blocks to improve code placement") },
1072 {"rename-registers", &flag_rename_registers, 1,
1073 N_("Do the register renaming optimization pass") },
1074 {"cprop-registers", &flag_cprop_registers, 1,
1075 N_("Do the register copy-propagation optimization pass") },
1076 {"common", &flag_no_common, 0,
1077 N_("Do not put uninitialized globals in the common section") },
1078 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1079 N_("Do not generate .size directives") },
1080 {"function-sections", &flag_function_sections, 1,
1081 N_("place each function into its own section") },
1082 {"data-sections", &flag_data_sections, 1,
1083 N_("place data items into their own section") },
1084 {"verbose-asm", &flag_verbose_asm, 1,
1085 N_("Add extra commentry to assembler output") },
1086 {"gnu-linker", &flag_gnu_linker, 1,
1087 N_("Output GNU ld formatted global initializers") },
1088 {"regmove", &flag_regmove, 1,
1089 N_("Enables a register move optimization") },
1090 {"optimize-register-move", &flag_regmove, 1,
1091 N_("Do the full regmove optimization pass") },
1092 {"pack-struct", &flag_pack_struct, 1,
1093 N_("Pack structure members together without holes") },
1094 {"stack-check", &flag_stack_check, 1,
1095 N_("Insert stack checking code into the program") },
1096 {"argument-alias", &flag_argument_noalias, 0,
1097 N_("Specify that arguments may alias each other & globals") },
1098 {"argument-noalias", &flag_argument_noalias, 1,
1099 N_("Assume arguments may alias globals but not each other") },
1100 {"argument-noalias-global", &flag_argument_noalias, 2,
1101 N_("Assume arguments do not alias each other or globals") },
1102 {"strict-aliasing", &flag_strict_aliasing, 1,
1103 N_("Assume strict aliasing rules apply") },
1104 {"align-loops", &align_loops, 0,
1105 N_("Align the start of loops") },
1106 {"align-jumps", &align_jumps, 0,
1107 N_("Align labels which are only reached by jumping") },
1108 {"align-labels", &align_labels, 0,
1109 N_("Align all labels") },
1110 {"align-functions", &align_functions, 0,
1111 N_("Align the start of functions") },
1112 {"merge-constants", &flag_merge_constants, 1,
1113 N_("Attempt to merge identical constants accross compilation units") },
1114 {"merge-all-constants", &flag_merge_constants, 2,
1115 N_("Attempt to merge identical constants and constant variables") },
1116 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1117 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1118 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1119 N_("Instrument function entry/exit with profiling calls") },
1120 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1121 N_("Put zero initialized data in the bss section") },
1122 {"ssa", &flag_ssa, 1,
1123 N_("Enable SSA optimizations") },
1124 {"ssa-ccp", &flag_ssa_ccp, 1,
1125 N_("Enable SSA conditional constant propagation") },
1126 {"ssa-dce", &flag_ssa_dce, 1,
1127 N_("Enable aggressive SSA dead code elimination") },
1128 {"leading-underscore", &flag_leading_underscore, 1,
1129 N_("External symbols have a leading underscore") },
1130 {"ident", &flag_no_ident, 0,
1131 N_("Process #ident directives") },
1132 { "peephole2", &flag_peephole2, 1,
1133 N_("Enables an rtl peephole pass run before sched2") },
1134 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1135 N_("Enables guessing of branch probabilities") },
1136 {"math-errno", &flag_errno_math, 1,
1137 N_("Set errno after built-in math functions") },
1138 {"trapping-math", &flag_trapping_math, 1,
1139 N_("Floating-point operations can trap") },
1140 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1141 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1142 {"bounded-pointers", &flag_bounded_pointers, 1,
1143 N_("Compile pointers as triples: value, base & end") },
1144 {"bounds-check", &flag_bounds_check, 1,
1145 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1146 {"single-precision-constant", &flag_single_precision_constant, 1,
1147 N_("Convert floating point constant to single precision constant") },
1148 {"time-report", &time_report, 1,
1149 N_("Report time taken by each compiler pass at end of run") },
1150 {"mem-report", &mem_report, 1,
1151 N_("Report on permanent memory allocation at end of run") },
1152 { "trapv", &flag_trapv, 1,
1153 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1156 /* Table of language-specific options. */
1158 static const struct lang_opt
1160 const char *const option;
1161 const char *const description;
1163 documented_lang_options[] =
1165 /* In order not to overload the --help output, the convention
1166 used here is to only describe those options which are not
1167 enabled by default. */
1170 N_("Compile just for ISO C89") },
1172 N_("Determine language standard") },
1174 { "-fsigned-bitfields", "" },
1175 { "-funsigned-bitfields",
1176 N_("Make bit-fields by unsigned by default") },
1177 { "-fno-signed-bitfields", "" },
1178 { "-fno-unsigned-bitfields","" },
1180 N_("Make 'char' be signed by default") },
1181 { "-funsigned-char",
1182 N_("Make 'char' be unsigned by default") },
1183 { "-fno-signed-char", "" },
1184 { "-fno-unsigned-char", "" },
1188 N_("Do not recognize the 'asm' keyword") },
1189 { "-fbuiltin", "" },
1191 N_("Do not recognize any built in functions") },
1193 N_("Assume normal C execution environment") },
1194 { "-fno-hosted", "" },
1196 N_("Assume that standard libraries & main might not exist") },
1197 { "-fno-freestanding", "" },
1198 { "-fcond-mismatch",
1199 N_("Allow different types as args of ? operator") },
1200 { "-fno-cond-mismatch", "" },
1201 { "-fdollars-in-identifiers",
1202 N_("Allow the use of $ inside identifiers") },
1203 { "-fno-dollars-in-identifiers", "" },
1204 { "-fpreprocessed", "" },
1205 { "-fno-preprocessed", "" },
1207 N_("Use the same size for double as for float") },
1208 { "-fno-short-double", "" },
1210 N_("Use the smallest fitting integer to hold enums") },
1211 { "-fno-short-enums", "" },
1213 N_("Override the underlying type for wchar_t to `unsigned short'") },
1214 { "-fno-short-wchar", "" },
1217 N_("Enable most warning messages") },
1218 { "-Wbad-function-cast",
1219 N_("Warn about casting functions to incompatible types") },
1220 { "-Wno-bad-function-cast", "" },
1221 { "-Wmissing-format-attribute",
1222 N_("Warn about functions which might be candidates for format attributes") },
1223 { "-Wno-missing-format-attribute", "" },
1225 N_("Warn about casts which discard qualifiers") },
1226 { "-Wno-cast-qual", "" },
1227 { "-Wchar-subscripts",
1228 N_("Warn about subscripts whose type is 'char'") },
1229 { "-Wno-char-subscripts", "" },
1231 N_("Warn if nested comments are detected") },
1232 { "-Wno-comment", "" },
1234 N_("Warn if nested comments are detected") },
1235 { "-Wno-comments", "" },
1237 N_("Warn about possibly confusing type conversions") },
1238 { "-Wno-conversion", "" },
1239 { "-Wdiv-by-zero", "" },
1240 { "-Wno-div-by-zero",
1241 N_("Do not warn about compile-time integer division by zero") },
1243 N_("Warn about testing equality of floating point numbers") },
1244 { "-Wno-float-equal", "" },
1246 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1247 { "-Wno-format", "" },
1248 { "-Wformat-extra-args", "" },
1249 { "-Wno-format-extra-args",
1250 N_("Don't warn about too many arguments to format functions") },
1251 { "-Wformat-nonliteral",
1252 N_("Warn about non-string-literal format strings") },
1253 { "-Wno-format-nonliteral", "" },
1254 { "-Wformat-security",
1255 N_("Warn about possible security problems with format functions") },
1256 { "-Wno-format-security", "" },
1257 { "-Wformat-y2k", "" },
1258 { "-Wno-format-y2k",
1259 N_("Don't warn about strftime formats yielding 2 digit years") },
1260 { "-Wimplicit-function-declaration",
1261 N_("Warn about implicit function declarations") },
1262 { "-Wno-implicit-function-declaration", "" },
1263 { "-Werror-implicit-function-declaration", "" },
1265 N_("Warn when a declaration does not specify a type") },
1266 { "-Wno-implicit-int", "" },
1267 { "-Wimplicit", "" },
1268 { "-Wno-implicit", "" },
1270 N_("Warn about the use of the #import directive") },
1271 { "-Wno-import", "" },
1272 { "-Wlong-long","" },
1274 N_("Do not warn about using 'long long' when -pedantic") },
1276 N_("Warn about suspicious declarations of main") },
1277 { "-Wno-main", "" },
1278 { "-Wmissing-braces",
1279 N_("Warn about possibly missing braces around initializers") },
1280 { "-Wno-missing-braces", "" },
1281 { "-Wmissing-declarations",
1282 N_("Warn about global funcs without previous declarations") },
1283 { "-Wno-missing-declarations", "" },
1284 { "-Wmissing-prototypes",
1285 N_("Warn about global funcs without prototypes") },
1286 { "-Wno-missing-prototypes", "" },
1288 N_("Warn about use of multicharacter literals") },
1289 { "-Wno-multichar", "" },
1290 { "-Wnested-externs",
1291 N_("Warn about externs not at file scope level") },
1292 { "-Wno-nested-externs", "" },
1294 N_("Warn about possible missing parentheses") },
1295 { "-Wno-parentheses", "" },
1296 { "-Wpointer-arith",
1297 N_("Warn about function pointer arithmetic") },
1298 { "-Wno-pointer-arith", "" },
1299 { "-Wredundant-decls",
1300 N_("Warn about multiple declarations of the same object") },
1301 { "-Wno-redundant-decls", "" },
1303 N_("Warn whenever a function's return-type defaults to int") },
1304 { "-Wno-return-type", "" },
1305 { "-Wsequence-point",
1306 N_("Warn about possible violations of sequence point rules") },
1307 { "-Wno-sequence-point", "" },
1309 N_("Warn about signed/unsigned comparisons") },
1310 { "-Wno-sign-compare", "" },
1311 { "-Wstrict-prototypes",
1312 N_("Warn about non-prototyped function decls") },
1313 { "-Wno-strict-prototypes", "" },
1315 N_("Warn about constructs whose meanings change in ISO C") },
1316 { "-Wno-traditional", "" },
1318 N_("Warn when trigraphs are encountered") },
1319 { "-Wno-trigraphs", "" },
1321 { "-Wno-undef", "" },
1322 { "-Wunknown-pragmas",
1323 N_("Warn about unrecognized pragmas") },
1324 { "-Wno-unknown-pragmas", "" },
1325 { "-Wwrite-strings",
1326 N_("Mark strings as 'const char *'") },
1327 { "-Wno-write-strings", "" },
1329 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1331 #include "options.h"
1335 /* Here is a table, controlled by the tm.h file, listing each -m switch
1336 and which bits in `target_switches' it should set or clear.
1337 If VALUE is positive, it is bits to set.
1338 If VALUE is negative, -VALUE is bits to clear.
1339 (The sign bit is not used so there is no confusion.) */
1343 const char *const name;
1345 const char *const description;
1347 target_switches[] = TARGET_SWITCHES;
1349 /* This table is similar, but allows the switch to have a value. */
1351 #ifdef TARGET_OPTIONS
1354 const char *const prefix;
1355 const char **const variable;
1356 const char *const description;
1358 target_options[] = TARGET_OPTIONS;
1361 /* Options controlling warnings. */
1363 /* Don't print warning messages. -w. */
1365 int inhibit_warnings = 0;
1367 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1369 int warn_system_headers = 0;
1371 /* Print various extra warnings. -W. */
1373 int extra_warnings = 0;
1375 /* Treat warnings as errors. -Werror. */
1377 int warnings_are_errors = 0;
1379 /* Nonzero to warn about unused variables, functions et.al. */
1381 int warn_unused_function;
1382 int warn_unused_label;
1383 int warn_unused_parameter;
1384 int warn_unused_variable;
1385 int warn_unused_value;
1387 /* Nonzero to warn about code which is never reached. */
1389 int warn_notreached;
1391 /* Nonzero to warn about variables used before they are initialized. */
1393 int warn_uninitialized;
1395 /* Nonzero means warn about all declarations which shadow others. */
1399 /* Warn if a switch on an enum, that does not have a default case,
1400 fails to have a case for every enum value. */
1404 /* Warn if a switch does not have a default case. */
1406 int warn_switch_default;
1408 /* Warn if a switch on an enum fails to have a case for every enum
1409 value (regardless of the presence or otherwise of a default case). */
1411 int warn_switch_enum;
1413 /* Nonzero means warn about function definitions that default the return type
1414 or that use a null return and have a return-type other than void. */
1416 int warn_return_type;
1418 /* Nonzero means warn about pointer casts that increase the required
1419 alignment of the target type (and might therefore lead to a crash
1420 due to a misaligned access). */
1422 int warn_cast_align;
1424 /* Nonzero means warn about any objects definitions whose size is larger
1425 than N bytes. Also want about function definitions whose returned
1426 values are larger than N bytes. The value N is in `larger_than_size'. */
1428 int warn_larger_than;
1429 HOST_WIDE_INT larger_than_size;
1431 /* Nonzero means warn if inline function is too large. */
1435 /* Warn if a function returns an aggregate,
1436 since there are often incompatible calling conventions for doing this. */
1438 int warn_aggregate_return;
1440 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1444 /* Warn when gcc pads a structure to an alignment boundary. */
1448 /* Warn when an optimization pass is disabled. */
1450 int warn_disabled_optimization;
1452 /* Warn about functions which might be candidates for attribute noreturn. */
1454 int warn_missing_noreturn;
1456 /* Nonzero means warn about uses of __attribute__((deprecated))
1459 int warn_deprecated_decl = 1;
1461 /* Likewise for -W. */
1463 static const lang_independent_options W_options[] =
1465 {"unused-function", &warn_unused_function, 1,
1466 N_("Warn when a function is unused") },
1467 {"unused-label", &warn_unused_label, 1,
1468 N_("Warn when a label is unused") },
1469 {"unused-parameter", &warn_unused_parameter, 1,
1470 N_("Warn when a function parameter is unused") },
1471 {"unused-variable", &warn_unused_variable, 1,
1472 N_("Warn when a variable is unused") },
1473 {"unused-value", &warn_unused_value, 1,
1474 N_("Warn when an expression value is unused") },
1475 {"system-headers", &warn_system_headers, 1,
1476 N_("Do not suppress warnings from system headers") },
1477 {"error", &warnings_are_errors, 1,
1478 N_("Treat all warnings as errors") },
1479 {"shadow", &warn_shadow, 1,
1480 N_("Warn when one local variable shadows another") },
1481 {"switch", &warn_switch, 1,
1482 N_("Warn about enumerated switches, with no default, missing a case") },
1483 {"switch-default", &warn_switch_default, 1,
1484 N_("Warn about enumerated switches missing a default case") },
1485 {"switch-enum", &warn_switch_enum, 1,
1486 N_("Warn about all enumerated switches missing a specific case") },
1487 {"aggregate-return", &warn_aggregate_return, 1,
1488 N_("Warn about returning structures, unions or arrays") },
1489 {"cast-align", &warn_cast_align, 1,
1490 N_("Warn about pointer casts which increase alignment") },
1491 {"unreachable-code", &warn_notreached, 1,
1492 N_("Warn about code that will never be executed") },
1493 {"uninitialized", &warn_uninitialized, 1,
1494 N_("Warn about uninitialized automatic variables") },
1495 {"inline", &warn_inline, 1,
1496 N_("Warn when an inlined function cannot be inlined") },
1497 {"packed", &warn_packed, 1,
1498 N_("Warn when the packed attribute has no effect on struct layout") },
1499 {"padded", &warn_padded, 1,
1500 N_("Warn when padding is required to align struct members") },
1501 {"disabled-optimization", &warn_disabled_optimization, 1,
1502 N_("Warn when an optimization pass is disabled") },
1503 {"deprecated-declarations", &warn_deprecated_decl, 1,
1504 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1505 {"missing-noreturn", &warn_missing_noreturn, 1,
1506 N_("Warn about functions which might be candidates for attribute noreturn") }
1510 set_Wunused (setting)
1513 warn_unused_function = setting;
1514 warn_unused_label = setting;
1515 /* Unused function parameter warnings are reported when either ``-W
1516 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1517 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1519 warn_unused_parameter = 0;
1520 else if (!warn_unused_parameter)
1521 warn_unused_parameter = -1;
1522 warn_unused_variable = setting;
1523 warn_unused_value = setting;
1526 /* The following routines are useful in setting all the flags that
1527 -ffast-math and -fno-fast-math imply. */
1530 set_fast_math_flags ()
1532 flag_trapping_math = 0;
1533 flag_unsafe_math_optimizations = 1;
1534 flag_errno_math = 0;
1538 set_no_fast_math_flags ()
1540 flag_trapping_math = 1;
1541 flag_unsafe_math_optimizations = 0;
1542 flag_errno_math = 1;
1546 /* Output files for assembler code (real compiler output)
1547 and debugging dumps. */
1550 FILE *aux_info_file;
1551 FILE *rtl_dump_file = NULL;
1553 /* Decode the string P as an integral parameter.
1554 If the string is indeed an integer return its numeric value else
1555 issue an Invalid Option error for the option PNAME and return DEFVAL.
1556 If PNAME is zero just return DEFVAL, do not call error. */
1559 read_integral_parameter (p, pname, defval)
1564 const char *endp = p;
1568 if (ISDIGIT (*endp))
1577 error ("invalid option `%s'", pname);
1584 /* This calls abort and is used to avoid problems when abort if a macro.
1585 It is used when we need to pass the address of abort. */
1593 /* When `malloc.c' is compiled with `rcheck' defined,
1594 it calls this function to report clobberage. */
1598 const char *s ATTRIBUTE_UNUSED;
1603 /* Return the logarithm of X, base 2, considering X unsigned,
1604 if X is a power of 2. Otherwise, returns -1.
1606 This should be used via the `exact_log2' macro. */
1610 unsigned HOST_WIDE_INT x;
1613 /* Test for 0 or a power of 2. */
1614 if (x == 0 || x != (x & -x))
1616 while ((x >>= 1) != 0)
1621 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1622 If X is 0, return -1.
1624 This should be used via the floor_log2 macro. */
1628 unsigned HOST_WIDE_INT x;
1637 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1638 into ICE messages, which is much more user friendly. */
1641 crash_signal (signo)
1644 internal_error ("internal error: %s", strsignal (signo));
1647 /* Strip off a legitimate source ending from the input string NAME of
1648 length LEN. Rather than having to know the names used by all of
1649 our front ends, we strip off an ending of a period followed by
1650 up to five characters. (Java uses ".class".) */
1653 strip_off_ending (name, len)
1658 for (i = 2; i < 6 && len > i; i++)
1660 if (name[len - i] == '.')
1662 name[len - i] = '\0';
1668 /* Output a quoted string. */
1671 output_quoted_string (asm_file, string)
1675 #ifdef OUTPUT_QUOTED_STRING
1676 OUTPUT_QUOTED_STRING (asm_file, string);
1680 putc ('\"', asm_file);
1681 while ((c = *string++) != 0)
1685 if (c == '\"' || c == '\\')
1686 putc ('\\', asm_file);
1690 fprintf (asm_file, "\\%03o", c);
1692 putc ('\"', asm_file);
1696 /* Output a file name in the form wanted by System V. */
1699 output_file_directive (asm_file, input_name)
1701 const char *input_name;
1703 int len = strlen (input_name);
1704 const char *na = input_name + len;
1706 /* NA gets INPUT_NAME sans directory names. */
1707 while (na > input_name)
1709 if (IS_DIR_SEPARATOR (na[-1]))
1714 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1715 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1717 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1718 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1720 fprintf (asm_file, "\t.file\t");
1721 output_quoted_string (asm_file, na);
1722 fputc ('\n', asm_file);
1727 /* Routine to open a dump file. Return true if the dump file is enabled. */
1730 open_dump_file (index, decl)
1731 enum dump_file_index index;
1735 const char *open_arg;
1738 if (! dump_file[index].enabled)
1741 timevar_push (TV_DUMP);
1742 if (rtl_dump_file != NULL)
1743 fclose (rtl_dump_file);
1745 sprintf (seq, DUMPFILE_FORMAT, index);
1747 if (! dump_file[index].initialized)
1749 /* If we've not initialized the files, do so now. */
1750 if (graph_dump_format != no_graph
1751 && dump_file[index].graph_dump_p)
1753 dump_name = concat (seq, dump_file[index].extension, NULL);
1754 clean_graph_dump_file (dump_base_name, dump_name);
1757 dump_file[index].initialized = 1;
1763 dump_name = concat (dump_base_name, seq,
1764 dump_file[index].extension, NULL);
1766 rtl_dump_file = fopen (dump_name, open_arg);
1767 if (rtl_dump_file == NULL)
1768 fatal_io_error ("can't open %s", dump_name);
1773 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1774 (*lang_hooks.decl_printable_name) (decl, 2));
1776 timevar_pop (TV_DUMP);
1780 /* Routine to close a dump file. */
1783 close_dump_file (index, func, insns)
1784 enum dump_file_index index;
1785 void (*func) PARAMS ((FILE *, rtx));
1788 if (! rtl_dump_file)
1791 timevar_push (TV_DUMP);
1793 && graph_dump_format != no_graph
1794 && dump_file[index].graph_dump_p)
1799 sprintf (seq, DUMPFILE_FORMAT, index);
1800 suffix = concat (seq, dump_file[index].extension, NULL);
1801 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1806 func (rtl_dump_file, insns);
1808 fflush (rtl_dump_file);
1809 fclose (rtl_dump_file);
1811 rtl_dump_file = NULL;
1812 timevar_pop (TV_DUMP);
1815 /* Do any final processing required for the declarations in VEC, of
1816 which there are LEN. We write out inline functions and variables
1817 that have been deferred until this point, but which are required.
1818 Returns non-zero if anything was put out. */
1821 wrapup_global_declarations (vec, len)
1828 int output_something = 0;
1830 for (i = 0; i < len; i++)
1834 /* We're not deferring this any longer. */
1835 DECL_DEFER_OUTPUT (decl) = 0;
1837 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1838 (*lang_hooks.finish_incomplete_decl) (decl);
1841 /* Now emit any global variables or functions that we have been
1842 putting off. We need to loop in case one of the things emitted
1843 here references another one which comes earlier in the list. */
1847 for (i = 0; i < len; i++)
1851 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1854 /* Don't write out static consts, unless we still need them.
1856 We also keep static consts if not optimizing (for debugging),
1857 unless the user specified -fno-keep-static-consts.
1858 ??? They might be better written into the debug information.
1859 This is possible when using DWARF.
1861 A language processor that wants static constants to be always
1862 written out (even if it is not used) is responsible for
1863 calling rest_of_decl_compilation itself. E.g. the C front-end
1864 calls rest_of_decl_compilation from finish_decl.
1865 One motivation for this is that is conventional in some
1866 environments to write things like:
1867 static const char rcsid[] = "... version string ...";
1868 intending to force the string to be in the executable.
1870 A language processor that would prefer to have unneeded
1871 static constants "optimized away" would just defer writing
1872 them out until here. E.g. C++ does this, because static
1873 constants are often defined in header files.
1875 ??? A tempting alternative (for both C and C++) would be
1876 to force a constant to be written if and only if it is
1877 defined in a main file, as opposed to an include file. */
1879 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1883 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1885 else if (DECL_COMDAT (decl))
1887 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1888 && (optimize || !flag_keep_static_consts
1889 || DECL_ARTIFICIAL (decl)))
1895 rest_of_decl_compilation (decl, NULL, 1, 1);
1899 if (TREE_CODE (decl) == FUNCTION_DECL
1900 && DECL_INITIAL (decl) != 0
1901 && DECL_SAVED_INSNS (decl) != 0
1902 && (flag_keep_inline_functions
1903 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1904 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1907 output_inline_function (decl);
1912 output_something = 1;
1916 return output_something;
1919 /* Issue appropriate warnings for the global declarations in VEC (of
1920 which there are LEN). Output debugging information for them. */
1923 check_global_declarations (vec, len)
1930 for (i = 0; i < len; i++)
1934 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1935 && ! TREE_ASM_WRITTEN (decl))
1936 /* Cancel the RTL for this decl so that, if debugging info
1937 output for global variables is still to come,
1938 this one will be omitted. */
1939 SET_DECL_RTL (decl, NULL_RTX);
1941 /* Warn about any function
1942 declared static but not defined.
1943 We don't warn about variables,
1944 because many programs have static variables
1945 that exist only to get some text into the object file. */
1946 if (TREE_CODE (decl) == FUNCTION_DECL
1947 && (warn_unused_function
1948 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1949 && DECL_INITIAL (decl) == 0
1950 && DECL_EXTERNAL (decl)
1951 && ! DECL_ARTIFICIAL (decl)
1952 && ! TREE_PUBLIC (decl))
1954 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1955 pedwarn_with_decl (decl,
1956 "`%s' used but never defined");
1958 warning_with_decl (decl,
1959 "`%s' declared `static' but never defined");
1960 /* This symbol is effectively an "extern" declaration now. */
1961 TREE_PUBLIC (decl) = 1;
1962 assemble_external (decl);
1965 /* Warn about static fns or vars defined but not used. */
1966 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1967 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1968 && ! TREE_USED (decl)
1969 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1970 to handle multiple external decls in different scopes. */
1971 && ! TREE_USED (DECL_NAME (decl))
1972 && ! DECL_EXTERNAL (decl)
1973 && ! TREE_PUBLIC (decl)
1974 /* Global register variables must be declared to reserve them. */
1975 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1976 /* Otherwise, ask the language. */
1977 && (*lang_hooks.decls.warn_unused_global) (decl))
1978 warning_with_decl (decl, "`%s' defined but not used");
1980 timevar_push (TV_SYMOUT);
1981 (*debug_hooks->global_decl) (decl);
1982 timevar_pop (TV_SYMOUT);
1986 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
1987 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1988 INPUT_FILENAME and LINENO accordingly. */
1991 push_srcloc (file, line)
1995 struct file_stack *fs;
1997 if (input_file_stack)
1999 input_file_stack->name = input_filename;
2000 input_file_stack->line = lineno;
2003 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2004 fs->name = input_filename = file;
2005 fs->line = lineno = line;
2006 fs->indent_level = 0;
2007 fs->next = input_file_stack;
2008 input_file_stack = fs;
2009 input_file_stack_tick++;
2012 /* Pop the top entry off the stack of presently open source files.
2013 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2019 struct file_stack *fs;
2021 fs = input_file_stack;
2022 input_file_stack = fs->next;
2024 input_file_stack_tick++;
2025 /* The initial source file is never popped. */
2026 if (!input_file_stack)
2028 input_filename = input_file_stack->name;
2029 lineno = input_file_stack->line;
2032 /* Compile an entire translation unit. Write a file of assembly
2033 output and various debugging dumps. */
2040 /* Initialize yet another pass. */
2042 init_final (main_input_filename);
2043 init_branch_prob (dump_base_name);
2045 timevar_push (TV_PARSE);
2047 /* Call the parser, which parses the entire file (calling
2048 rest_of_compilation for each function). */
2049 (*lang_hooks.parse_file) (set_yydebug);
2051 /* In case there were missing block closers,
2052 get us back to the global binding level. */
2053 (*lang_hooks.clear_binding_stack) ();
2055 /* Compilation is now finished except for writing
2056 what's left of the symbol table output. */
2057 timevar_pop (TV_PARSE);
2059 if (flag_syntax_only)
2062 globals = (*lang_hooks.decls.getdecls) ();
2064 /* Really define vars that have had only a tentative definition.
2065 Really output inline functions that must actually be callable
2066 and have not been output so far. */
2069 int len = list_length (globals);
2070 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2074 /* Process the decls in reverse order--earliest first.
2075 Put them into VEC from back to front, then take out from front. */
2077 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2078 vec[len - i - 1] = decl;
2080 wrapup_global_declarations (vec, len);
2082 /* This must occur after the loop to output deferred functions. Else
2083 the profiler initializer would not be emitted if all the functions
2084 in this compilation unit were deferred.
2086 output_func_start_profiler can not cause any additional functions or
2087 data to need to be output, so it need not be in the deferred function
2089 output_func_start_profiler ();
2091 check_global_declarations (vec, len);
2097 /* Write out any pending weak symbol declarations. */
2101 /* Do dbx symbols. */
2102 timevar_push (TV_SYMOUT);
2104 #ifdef DWARF2_UNWIND_INFO
2105 if (dwarf2out_do_frame ())
2106 dwarf2out_frame_finish ();
2109 (*debug_hooks->finish) (main_input_filename);
2110 timevar_pop (TV_SYMOUT);
2112 /* Output some stuff at end of file if nec. */
2114 dw2_output_indirect_constants ();
2116 end_final (dump_base_name);
2118 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2120 timevar_push (TV_DUMP);
2121 open_dump_file (DFI_bp, NULL);
2125 close_dump_file (DFI_bp, NULL, NULL_RTX);
2126 timevar_pop (TV_DUMP);
2130 ASM_FILE_END (asm_out_file);
2133 /* Attach a special .ident directive to the end of the file to identify
2134 the version of GCC which compiled this code. The format of the .ident
2135 string is patterned after the ones produced by native SVR4 compilers. */
2138 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2139 IDENT_ASM_OP, version_string);
2142 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2144 timevar_push (TV_DUMP);
2145 dump_combine_total_stats (rtl_dump_file);
2146 close_dump_file (DFI_combine, NULL, NULL_RTX);
2147 timevar_pop (TV_DUMP);
2151 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2152 and TYPE_DECL nodes.
2154 This does nothing for local (non-static) variables, unless the
2155 variable is a register variable with an ASMSPEC. In that case, or
2156 if the variable is not an automatic, it sets up the RTL and
2157 outputs any assembler code (label definition, storage allocation
2158 and initialization).
2160 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2161 the assembler symbol name to be used. TOP_LEVEL is nonzero
2162 if this declaration is not within a function. */
2165 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2167 const char *asmspec;
2171 /* Declarations of variables, and of functions defined elsewhere. */
2173 /* The most obvious approach, to put an #ifndef around where
2174 this macro is used, doesn't work since it's inside a macro call. */
2175 #ifndef ASM_FINISH_DECLARE_OBJECT
2176 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2179 /* We deferred calling assemble_alias so that we could collect
2180 other attributes such as visibility. Emit the alias now. */
2183 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2186 alias = TREE_VALUE (TREE_VALUE (alias));
2187 alias = get_identifier (TREE_STRING_POINTER (alias));
2188 assemble_alias (decl, alias);
2192 /* Forward declarations for nested functions are not "external",
2193 but we need to treat them as if they were. */
2194 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2195 || TREE_CODE (decl) == FUNCTION_DECL)
2197 timevar_push (TV_VARCONST);
2200 make_decl_rtl (decl, asmspec);
2202 /* Don't output anything when a tentative file-scope definition
2203 is seen. But at end of compilation, do output code for them. */
2204 if (at_end || !DECL_DEFER_OUTPUT (decl))
2205 assemble_variable (decl, top_level, at_end, 0);
2206 if (decl == last_assemble_variable_decl)
2208 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2212 timevar_pop (TV_VARCONST);
2214 else if (DECL_REGISTER (decl) && asmspec != 0)
2216 if (decode_reg_name (asmspec) >= 0)
2218 SET_DECL_RTL (decl, NULL_RTX);
2219 make_decl_rtl (decl, asmspec);
2223 error ("invalid register name `%s' for register variable", asmspec);
2224 DECL_REGISTER (decl) = 0;
2229 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2230 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2231 && TREE_CODE (decl) == TYPE_DECL)
2233 timevar_push (TV_SYMOUT);
2234 dbxout_symbol (decl, 0);
2235 timevar_pop (TV_SYMOUT);
2238 #ifdef SDB_DEBUGGING_INFO
2239 else if (write_symbols == SDB_DEBUG && top_level
2240 && TREE_CODE (decl) == TYPE_DECL)
2242 timevar_push (TV_SYMOUT);
2243 sdbout_symbol (decl, 0);
2244 timevar_pop (TV_SYMOUT);
2249 /* Called after finishing a record, union or enumeral type. */
2252 rest_of_type_compilation (type, toplev)
2253 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2257 tree type ATTRIBUTE_UNUSED;
2258 int toplev ATTRIBUTE_UNUSED;
2261 timevar_push (TV_SYMOUT);
2262 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2263 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2264 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2266 #ifdef SDB_DEBUGGING_INFO
2267 if (write_symbols == SDB_DEBUG)
2268 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2270 #ifdef DWARF2_DEBUGGING_INFO
2271 if ((write_symbols == DWARF2_DEBUG
2272 || write_symbols == VMS_AND_DWARF2_DEBUG)
2274 dwarf2out_decl (TYPE_STUB_DECL (type));
2276 timevar_pop (TV_SYMOUT);
2279 /* This is called from finish_function (within langhooks.parse_file)
2280 after each top-level definition is parsed.
2281 It is supposed to compile that function or variable
2282 and output the assembler code for it.
2283 After we return, the tree storage is freed. */
2286 rest_of_compilation (decl)
2292 int rebuild_label_notes_after_reload;
2293 int register_life_up_to_date;
2295 timevar_push (TV_REST_OF_COMPILATION);
2297 /* Now that we're out of the frontend, we shouldn't have any more
2298 CONCATs anywhere. */
2299 generating_concat_p = 0;
2301 /* When processing delayed functions, prepare_function_start() won't
2302 have been run to re-initialize it. */
2303 cse_not_expected = ! optimize;
2305 /* First, make sure that NOTE_BLOCK is set correctly for each
2306 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2307 if (!cfun->x_whole_function_mode_p)
2310 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2311 tree in sensible shape. So, we just recalculate it here. */
2312 if (cfun->x_whole_function_mode_p)
2317 /* If we are reconsidering an inline function
2318 at the end of compilation, skip the stuff for making it inline. */
2320 if (DECL_SAVED_INSNS (decl) == 0)
2326 /* If this is nested inside an inlined external function, pretend
2327 it was only declared. Since we cannot inline such functions,
2328 generating code for this one is not only not necessary but will
2329 confuse some debugging output writers. */
2330 for (parent = DECL_CONTEXT (current_function_decl);
2331 parent != NULL_TREE;
2332 parent = get_containing_scope (parent))
2333 if (TREE_CODE (parent) == FUNCTION_DECL
2334 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2336 DECL_INITIAL (decl) = 0;
2337 goto exit_rest_of_compilation;
2340 /* If requested, consider whether to make this function inline. */
2341 if ((DECL_INLINE (decl) && !flag_no_inline)
2342 || flag_inline_functions)
2344 timevar_push (TV_INTEGRATION);
2345 lose = function_cannot_inline_p (decl);
2346 timevar_pop (TV_INTEGRATION);
2347 if (lose || ! optimize)
2349 if (warn_inline && DECL_INLINE (decl))
2350 warning_with_decl (decl, lose);
2351 DECL_ABSTRACT_ORIGIN (decl) = 0;
2352 /* Don't really compile an extern inline function.
2353 If we can't make it inline, pretend
2354 it was only declared. */
2355 if (DECL_EXTERNAL (decl))
2357 DECL_INITIAL (decl) = 0;
2358 goto exit_rest_of_compilation;
2362 /* ??? Note that this has the effect of making it look
2363 like "inline" was specified for a function if we choose
2364 to inline it. This isn't quite right, but it's
2365 probably not worth the trouble to fix. */
2366 inlinable = DECL_INLINE (decl) = 1;
2369 insns = get_insns ();
2371 /* Dump the rtl code if we are dumping rtl. */
2373 if (open_dump_file (DFI_rtl, decl))
2375 if (DECL_SAVED_INSNS (decl))
2376 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2377 close_dump_file (DFI_rtl, print_rtl, insns);
2380 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2381 sorts of eh initialization. Delay this until after the
2382 initial rtl dump so that we can see the original nesting. */
2383 convert_from_eh_region_ranges ();
2385 /* If function is inline, and we don't yet know whether to
2386 compile it by itself, defer decision till end of compilation.
2387 finish_compilation will call rest_of_compilation again
2388 for those functions that need to be output. Also defer those
2389 functions that we are supposed to defer. */
2392 || (DECL_INLINE (decl)
2393 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2394 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2395 && ! flag_keep_inline_functions)
2396 || DECL_EXTERNAL (decl))))
2397 DECL_DEFER_OUTPUT (decl) = 1;
2399 if (DECL_INLINE (decl))
2400 /* DWARF wants separate debugging info for abstract and
2401 concrete instances of all inline functions, including those
2402 declared inline but not inlined, and those inlined even
2403 though they weren't declared inline. Conveniently, that's
2404 what DECL_INLINE means at this point. */
2405 (*debug_hooks->deferred_inline_function) (decl);
2407 if (DECL_DEFER_OUTPUT (decl))
2409 /* If -Wreturn-type, we have to do a bit of compilation. We just
2410 want to call cleanup the cfg to figure out whether or not we can
2411 fall off the end of the function; we do the minimum amount of
2412 work necessary to make that safe. */
2413 if (warn_return_type)
2415 int saved_optimize = optimize;
2418 rebuild_jump_labels (insns);
2419 find_exception_handler_labels ();
2420 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2421 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2422 optimize = saved_optimize;
2424 /* CFG is no longer maintained up-to-date. */
2425 free_bb_for_insn ();
2428 current_function_nothrow = nothrow_function_p ();
2429 if (current_function_nothrow)
2430 /* Now we know that this can't throw; set the flag for the benefit
2431 of other functions later in this translation unit. */
2432 TREE_NOTHROW (current_function_decl) = 1;
2434 timevar_push (TV_INTEGRATION);
2435 save_for_inline (decl);
2436 timevar_pop (TV_INTEGRATION);
2437 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2438 goto exit_rest_of_compilation;
2441 /* If specified extern inline but we aren't inlining it, we are
2442 done. This goes for anything that gets here with DECL_EXTERNAL
2443 set, not just things with DECL_INLINE. */
2444 if (DECL_EXTERNAL (decl))
2445 goto exit_rest_of_compilation;
2448 /* If we're emitting a nested function, make sure its parent gets
2449 emitted as well. Doing otherwise confuses debug info. */
2452 for (parent = DECL_CONTEXT (current_function_decl);
2453 parent != NULL_TREE;
2454 parent = get_containing_scope (parent))
2455 if (TREE_CODE (parent) == FUNCTION_DECL)
2456 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2459 /* We are now committed to emitting code for this function. Do any
2460 preparation, such as emitting abstract debug info for the inline
2461 before it gets mangled by optimization. */
2462 if (DECL_INLINE (decl))
2463 (*debug_hooks->outlining_inline_function) (decl);
2465 /* Remove any notes we don't need. That will make iterating
2466 over the instruction sequence faster, and allow the garbage
2467 collector to reclaim the memory used by the notes. */
2468 remove_unnecessary_notes ();
2473 /* Initialize some variables used by the optimizers. */
2474 init_function_for_compilation ();
2476 if (! DECL_DEFER_OUTPUT (decl))
2477 TREE_ASM_WRITTEN (decl) = 1;
2479 /* Now that integrate will no longer see our rtl, we need not
2480 distinguish between the return value of this function and the
2481 return value of called functions. Also, we can remove all SETs
2482 of subregs of hard registers; they are only here because of
2483 integrate. Also, we can now initialize pseudos intended to
2484 carry magic hard reg data throughout the function. */
2485 rtx_equal_function_value_matters = 0;
2486 purge_hard_subreg_sets (get_insns ());
2488 /* Early return if there were errors. We can run afoul of our
2489 consistency checks, and there's not really much point in fixing them.
2490 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2491 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2492 || errorcount || sorrycount)
2493 goto exit_rest_of_compilation;
2495 timevar_push (TV_JUMP);
2496 open_dump_file (DFI_sibling, decl);
2497 insns = get_insns ();
2498 rebuild_jump_labels (insns);
2499 find_exception_handler_labels ();
2500 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2502 delete_unreachable_blocks ();
2504 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2505 note_prediction_to_br_prob ();
2507 /* We may have potential sibling or tail recursion sites. Select one
2508 (of possibly multiple) methods of performing the call. */
2509 if (flag_optimize_sibling_calls)
2512 optimize_sibling_and_tail_recursive_calls ();
2514 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2515 notes before simplifying cfg and we must do lowering after sibcall
2516 that unhides parts of RTL chain and cleans up the CFG.
2518 Until sibcall is replaced by tree-level optimizer, lets just
2519 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2520 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2521 if (GET_CODE (insn) == NOTE
2522 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2525 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2526 timevar_pop (TV_JUMP);
2528 /* Complete generation of exception handling code. */
2529 find_exception_handler_labels ();
2532 timevar_push (TV_JUMP);
2533 open_dump_file (DFI_eh, decl);
2535 finish_eh_generation ();
2537 close_dump_file (DFI_eh, print_rtl, get_insns ());
2538 timevar_pop (TV_JUMP);
2541 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2542 generation, which might create new sets. */
2543 emit_initial_value_sets ();
2546 /* If we are doing position-independent code generation, now
2547 is the time to output special prologues and epilogues.
2548 We do not want to do this earlier, because it just clutters
2549 up inline functions with meaningless insns. */
2554 insns = get_insns ();
2556 /* Copy any shared structure that should not be shared. */
2557 unshare_all_rtl (current_function_decl, insns);
2559 #ifdef SETJMP_VIA_SAVE_AREA
2560 /* This must be performed before virtual register instantiation. */
2561 if (current_function_calls_alloca)
2562 optimize_save_area_alloca (insns);
2565 /* Instantiate all virtual registers. */
2566 instantiate_virtual_regs (current_function_decl, insns);
2568 open_dump_file (DFI_jump, decl);
2570 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2571 are initialized and to compute whether control can drop off the end
2574 timevar_push (TV_JUMP);
2575 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2576 before jump optimization switches branch directions. */
2577 expected_value_to_br_prob ();
2579 reg_scan (insns, max_reg_num (), 0);
2580 rebuild_jump_labels (insns);
2581 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2583 dump_flow_info (rtl_dump_file);
2584 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2585 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2587 /* CFG is no longer maintained up-to-date. */
2588 free_bb_for_insn ();
2589 copy_loop_headers (insns);
2590 purge_line_number_notes (insns);
2592 timevar_pop (TV_JUMP);
2593 close_dump_file (DFI_jump, print_rtl, insns);
2595 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2596 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2598 goto exit_rest_of_compilation;
2601 /* Long term, this should probably move before the jump optimizer too,
2602 but I didn't want to disturb the rtl_dump_and_exit and related
2603 stuff at this time. */
2604 if (optimize > 0 && flag_ssa)
2606 /* Convert to SSA form. */
2608 timevar_push (TV_TO_SSA);
2609 open_dump_file (DFI_ssa, decl);
2611 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2612 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2615 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2616 timevar_pop (TV_TO_SSA);
2618 /* Perform sparse conditional constant propagation, if requested. */
2621 timevar_push (TV_SSA_CCP);
2622 open_dump_file (DFI_ssa_ccp, decl);
2626 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2627 timevar_pop (TV_SSA_CCP);
2630 /* It would be useful to cleanup the CFG at this point, but block
2631 merging and possibly other transformations might leave a PHI
2632 node in the middle of a basic block, which is a strict no-no. */
2634 /* The SSA implementation uses basic block numbers in its phi
2635 nodes. Thus, changing the control-flow graph or the basic
2636 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2637 may cause problems. */
2641 /* Remove dead code. */
2643 timevar_push (TV_SSA_DCE);
2644 open_dump_file (DFI_ssa_dce, decl);
2646 insns = get_insns ();
2647 ssa_eliminate_dead_code ();
2649 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2650 timevar_pop (TV_SSA_DCE);
2653 /* Convert from SSA form. */
2655 timevar_push (TV_FROM_SSA);
2656 open_dump_file (DFI_ussa, decl);
2658 convert_from_ssa ();
2659 /* New registers have been created. Rescan their usage. */
2660 reg_scan (insns, max_reg_num (), 1);
2662 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2663 timevar_pop (TV_FROM_SSA);
2666 /* CFG is no longer maintained up-to-date. */
2667 free_bb_for_insn ();
2670 timevar_push (TV_JUMP);
2672 if (flag_delete_null_pointer_checks || flag_if_conversion)
2674 open_dump_file (DFI_null, decl);
2675 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2677 dump_flow_info (rtl_dump_file);
2678 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2680 /* Try to identify useless null pointer tests and delete them. */
2681 if (flag_delete_null_pointer_checks)
2682 delete_null_pointer_checks (insns);
2684 timevar_push (TV_IFCVT);
2685 if (flag_if_conversion)
2687 timevar_pop (TV_IFCVT);
2688 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2689 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2692 /* Jump optimization, and the removal of NULL pointer checks, may
2693 have reduced the number of instructions substantially. CSE, and
2694 future passes, allocate arrays whose dimensions involve the
2695 maximum instruction UID, so if we can reduce the maximum UID
2696 we'll save big on memory. */
2697 renumber_insns (rtl_dump_file);
2699 compute_bb_for_insn (get_max_uid ());
2700 timevar_pop (TV_JUMP);
2702 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2706 /* Perform common subexpression elimination.
2707 Nonzero value from `cse_main' means that jumps were simplified
2708 and some code may now be unreachable, so do
2709 jump optimization again. */
2713 open_dump_file (DFI_cse, decl);
2715 dump_flow_info (rtl_dump_file);
2716 timevar_push (TV_CSE);
2718 reg_scan (insns, max_reg_num (), 1);
2720 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2722 rebuild_jump_labels (insns);
2723 purge_all_dead_edges (0);
2725 delete_trivially_dead_insns (insns, max_reg_num ());
2727 /* If we are not running more CSE passes, then we are no longer
2728 expecting CSE to be run. But always rerun it in a cheap mode. */
2729 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2731 if (tem || optimize > 1)
2732 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2733 /* Try to identify useless null pointer tests and delete them. */
2734 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2736 timevar_push (TV_JUMP);
2738 if (flag_delete_null_pointer_checks)
2739 delete_null_pointer_checks (insns);
2740 /* CFG is no longer maintained up-to-date. */
2741 timevar_pop (TV_JUMP);
2744 /* The second pass of jump optimization is likely to have
2745 removed a bunch more instructions. */
2746 renumber_insns (rtl_dump_file);
2747 compute_bb_for_insn (get_max_uid ());
2749 timevar_pop (TV_CSE);
2750 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2753 open_dump_file (DFI_addressof, decl);
2755 purge_addressof (insns);
2757 purge_all_dead_edges (0);
2758 reg_scan (insns, max_reg_num (), 1);
2760 close_dump_file (DFI_addressof, print_rtl, insns);
2764 /* Perform global cse. */
2766 if (optimize > 0 && flag_gcse)
2768 int save_csb, save_cfj;
2771 timevar_push (TV_GCSE);
2772 open_dump_file (DFI_gcse, decl);
2774 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2775 tem = gcse_main (insns, rtl_dump_file);
2776 rebuild_jump_labels (insns);
2777 delete_trivially_dead_insns (insns, max_reg_num ());
2779 save_csb = flag_cse_skip_blocks;
2780 save_cfj = flag_cse_follow_jumps;
2781 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2783 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2785 if (flag_expensive_optimizations)
2787 timevar_push (TV_CSE);
2788 reg_scan (insns, max_reg_num (), 1);
2789 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2790 purge_all_dead_edges (0);
2791 delete_trivially_dead_insns (insns, max_reg_num ());
2792 timevar_pop (TV_CSE);
2793 cse_not_expected = !flag_rerun_cse_after_loop;
2796 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2797 things up. Then possibly re-run CSE again. */
2801 timevar_push (TV_JUMP);
2802 rebuild_jump_labels (insns);
2803 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2804 timevar_pop (TV_JUMP);
2806 if (flag_expensive_optimizations)
2808 timevar_push (TV_CSE);
2809 reg_scan (insns, max_reg_num (), 1);
2810 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2811 purge_all_dead_edges (0);
2812 delete_trivially_dead_insns (insns, max_reg_num ());
2813 timevar_pop (TV_CSE);
2817 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2818 timevar_pop (TV_GCSE);
2821 flag_cse_skip_blocks = save_csb;
2822 flag_cse_follow_jumps = save_cfj;
2823 #ifdef ENABLE_CHECKING
2824 verify_flow_info ();
2828 /* Move constant computations out of loops. */
2830 if (optimize > 0 && flag_loop_optimize)
2832 timevar_push (TV_LOOP);
2833 delete_dead_jumptables ();
2834 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2835 open_dump_file (DFI_loop, decl);
2836 /* CFG is no longer maintained up-to-date. */
2837 free_bb_for_insn ();
2839 if (flag_rerun_loop_opt)
2841 cleanup_barriers ();
2843 /* We only want to perform unrolling once. */
2844 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2846 /* The first call to loop_optimize makes some instructions
2847 trivially dead. We delete those instructions now in the
2848 hope that doing so will make the heuristics in loop work
2849 better and possibly speed up compilation. */
2850 delete_trivially_dead_insns (insns, max_reg_num ());
2852 /* The regscan pass is currently necessary as the alias
2853 analysis code depends on this information. */
2854 reg_scan (insns, max_reg_num (), 1);
2856 cleanup_barriers ();
2857 loop_optimize (insns, rtl_dump_file,
2858 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2859 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2861 /* Loop can create trivially dead instructions. */
2862 delete_trivially_dead_insns (insns, max_reg_num ());
2863 close_dump_file (DFI_loop, print_rtl, insns);
2864 timevar_pop (TV_LOOP);
2869 /* Do control and data flow analysis; wrote some of the results to
2872 timevar_push (TV_FLOW);
2873 open_dump_file (DFI_cfg, decl);
2875 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2877 dump_flow_info (rtl_dump_file);
2878 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2879 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2881 /* It may make more sense to mark constant functions after dead code is
2882 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2883 may insert code making function non-constant, but we still must consider
2884 it as constant, otherwise -fbranch-probabilities will not read data back.
2886 life_analyzis rarely eliminates modification of external memory.
2889 mark_constant_function ();
2891 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2893 /* Do branch profiling and static profile estimation passes. */
2894 if (optimize > 0 || profile_arc_flag || flag_test_coverage
2895 || flag_branch_probabilities)
2899 timevar_push (TV_BRANCH_PROB);
2900 open_dump_file (DFI_bp, decl);
2901 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2904 /* Discover and record the loop depth at the head of each basic
2905 block. The loop infrastructure does the real job for us. */
2906 flow_loops_find (&loops, LOOP_TREE);
2908 /* Estimate using heuristics if no profiling info is available. */
2909 if (flag_guess_branch_prob)
2910 estimate_probability (&loops);
2913 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2915 flow_loops_free (&loops);
2916 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2917 timevar_pop (TV_BRANCH_PROB);
2922 timevar_push (TV_CSE2);
2923 open_dump_file (DFI_cse2, decl);
2925 dump_flow_info (rtl_dump_file);
2927 if (flag_rerun_cse_after_loop)
2929 timevar_push (TV_JUMP);
2931 reg_scan (insns, max_reg_num (), 0);
2933 timevar_push (TV_IFCVT);
2934 cleanup_cfg (CLEANUP_EXPENSIVE);
2935 if (flag_if_conversion)
2937 timevar_pop (TV_IFCVT);
2939 timevar_pop (TV_JUMP);
2940 /* CFG is no longer maintained up-to-date. */
2941 reg_scan (insns, max_reg_num (), 0);
2942 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2943 purge_all_dead_edges (0);
2944 delete_trivially_dead_insns (insns, max_reg_num ());
2948 timevar_push (TV_JUMP);
2949 rebuild_jump_labels (insns);
2950 cleanup_cfg (CLEANUP_EXPENSIVE);
2951 timevar_pop (TV_JUMP);
2955 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2956 timevar_pop (TV_CSE2);
2961 cse_not_expected = 1;
2963 open_dump_file (DFI_life, decl);
2966 check_function_return_warnings ();
2968 #ifdef ENABLE_CHECKING
2969 verify_flow_info ();
2971 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2973 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2974 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2975 timevar_pop (TV_FLOW);
2979 if (warn_uninitialized || extra_warnings)
2981 uninitialized_vars_warning (DECL_INITIAL (decl));
2983 setjmp_args_warning ();
2989 if (initialize_uninitialized_subregs ())
2991 /* Insns were inserted, so things might look a bit different. */
2992 insns = get_insns ();
2993 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
2994 PROP_LOG_LINKS | PROP_REG_INFO
2995 | PROP_DEATH_NOTES);
2999 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3003 /* If -opt, try combining insns through substitution. */
3007 int rebuild_jump_labels_after_combine = 0;
3009 timevar_push (TV_COMBINE);
3010 open_dump_file (DFI_combine, decl);
3012 rebuild_jump_labels_after_combine
3013 = combine_instructions (insns, max_reg_num ());
3015 /* Combining insns may have turned an indirect jump into a
3016 direct jump. Rebuid the JUMP_LABEL fields of jumping
3018 if (rebuild_jump_labels_after_combine)
3020 timevar_push (TV_JUMP);
3021 rebuild_jump_labels (insns);
3022 timevar_pop (TV_JUMP);
3024 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3027 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3028 timevar_pop (TV_COMBINE);
3033 /* Rerun if-conversion, as combine may have simplified things enough to
3034 now meet sequence length restrictions. */
3035 if (flag_if_conversion)
3037 timevar_push (TV_IFCVT);
3038 open_dump_file (DFI_ce, decl);
3044 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3045 timevar_pop (TV_IFCVT);
3048 /* Register allocation pre-pass, to reduce number of moves
3049 necessary for two-address machines. */
3050 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3052 timevar_push (TV_REGMOVE);
3053 open_dump_file (DFI_regmove, decl);
3055 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3057 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3058 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3059 timevar_pop (TV_REGMOVE);
3064 /* Do unconditional splitting before register allocation to allow machine
3065 description to add extra information not needed previously. */
3066 split_all_insns (1);
3068 /* Any of the several passes since flow1 will have munged register
3069 lifetime data a bit. */
3070 register_life_up_to_date = 0;
3072 #ifdef OPTIMIZE_MODE_SWITCHING
3073 timevar_push (TV_MODE_SWITCH);
3076 optimize_mode_switching (NULL);
3079 timevar_pop (TV_MODE_SWITCH);
3082 timevar_push (TV_SCHED);
3084 #ifdef INSN_SCHEDULING
3086 /* Print function header into sched dump now
3087 because doing the sched analysis makes some of the dump. */
3088 if (optimize > 0 && flag_schedule_insns)
3090 open_dump_file (DFI_sched, decl);
3092 /* Do control and data sched analysis,
3093 and write some of the results to dump file. */
3095 schedule_insns (rtl_dump_file);
3097 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3099 /* Register lifetime information was updated as part of verifying
3101 register_life_up_to_date = 1;
3104 timevar_pop (TV_SCHED);
3108 /* Determine if the current function is a leaf before running reload
3109 since this can impact optimizations done by the prologue and
3110 epilogue thus changing register elimination offsets. */
3111 current_function_is_leaf = leaf_function_p ();
3113 timevar_push (TV_LOCAL_ALLOC);
3114 open_dump_file (DFI_lreg, decl);
3116 /* Allocate pseudo-regs that are used only within 1 basic block.
3118 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3119 jump optimizer after register allocation and reloading are finished. */
3121 if (! register_life_up_to_date)
3122 recompute_reg_usage (insns, ! optimize_size);
3124 /* Allocate the reg_renumber array. */
3125 allocate_reg_info (max_regno, FALSE, TRUE);
3127 /* And the reg_equiv_memory_loc array. */
3128 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3130 allocate_initial_values (reg_equiv_memory_loc);
3132 regclass (insns, max_reg_num (), rtl_dump_file);
3133 rebuild_label_notes_after_reload = local_alloc ();
3135 timevar_pop (TV_LOCAL_ALLOC);
3137 if (dump_file[DFI_lreg].enabled)
3139 timevar_push (TV_DUMP);
3141 dump_flow_info (rtl_dump_file);
3142 dump_local_alloc (rtl_dump_file);
3144 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3145 timevar_pop (TV_DUMP);
3150 timevar_push (TV_GLOBAL_ALLOC);
3151 open_dump_file (DFI_greg, decl);
3153 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3154 pass fixing up any insns that are invalid. */
3157 failure = global_alloc (rtl_dump_file);
3160 build_insn_chain (insns);
3161 failure = reload (insns, 0);
3164 timevar_pop (TV_GLOBAL_ALLOC);
3166 if (dump_file[DFI_greg].enabled)
3168 timevar_push (TV_DUMP);
3170 dump_global_regs (rtl_dump_file);
3172 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3173 timevar_pop (TV_DUMP);
3177 goto exit_rest_of_compilation;
3181 open_dump_file (DFI_postreload, decl);
3183 /* Do a very simple CSE pass over just the hard registers. */
3186 timevar_push (TV_RELOAD_CSE_REGS);
3187 reload_cse_regs (insns);
3188 timevar_pop (TV_RELOAD_CSE_REGS);
3191 /* Register allocation and reloading may have turned an indirect jump into
3192 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3193 jumping instructions. */
3194 if (rebuild_label_notes_after_reload)
3196 timevar_push (TV_JUMP);
3198 rebuild_jump_labels (insns);
3199 purge_all_dead_edges (0);
3201 timevar_pop (TV_JUMP);
3204 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3206 /* Re-create the death notes which were deleted during reload. */
3207 timevar_push (TV_FLOW2);
3208 open_dump_file (DFI_flow2, decl);
3210 #ifdef ENABLE_CHECKING
3211 verify_flow_info ();
3214 /* If optimizing, then go ahead and split insns now. */
3216 split_all_insns (0);
3218 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3220 /* On some machines, the prologue and epilogue code, or parts thereof,
3221 can be represented as RTL. Doing so lets us schedule insns between
3222 it and the rest of the code and also allows delayed branch
3223 scheduling to operate in the epilogue. */
3224 thread_prologue_and_epilogue_insns (insns);
3228 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3229 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3230 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3232 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3233 even for machines with possibly nonzero RETURN_POPS_ARGS
3234 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3235 push instructions will have popping returns. */
3236 #ifndef PUSH_ROUNDING
3237 if (!ACCUMULATE_OUTGOING_ARGS)
3239 combine_stack_adjustments ();
3244 flow2_completed = 1;
3246 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3247 timevar_pop (TV_FLOW2);
3249 #ifdef HAVE_peephole2
3250 if (optimize > 0 && flag_peephole2)
3252 timevar_push (TV_PEEPHOLE2);
3253 open_dump_file (DFI_peephole2, decl);
3255 peephole2_optimize (rtl_dump_file);
3257 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3258 timevar_pop (TV_PEEPHOLE2);
3262 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3264 timevar_push (TV_RENAME_REGISTERS);
3265 open_dump_file (DFI_rnreg, decl);
3267 if (flag_rename_registers)
3268 regrename_optimize ();
3269 if (flag_cprop_registers)
3270 copyprop_hardreg_forward ();
3272 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3273 timevar_pop (TV_RENAME_REGISTERS);
3276 if (flag_if_conversion2)
3278 timevar_push (TV_IFCVT2);
3279 open_dump_file (DFI_ce2, decl);
3283 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3284 timevar_pop (TV_IFCVT2);
3288 split_all_insns (1);
3291 #ifdef INSN_SCHEDULING
3292 if (optimize > 0 && flag_schedule_insns_after_reload)
3294 timevar_push (TV_SCHED2);
3295 open_dump_file (DFI_sched2, decl);
3297 /* Do control and data sched analysis again,
3298 and write some more of the results to dump file. */
3300 split_all_insns (1);
3302 schedule_insns (rtl_dump_file);
3304 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3305 timevar_pop (TV_SCHED2);
3311 #ifdef LEAF_REGISTERS
3312 current_function_uses_only_leaf_regs
3313 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3317 timevar_push (TV_REG_STACK);
3318 open_dump_file (DFI_stack, decl);
3320 reg_to_stack (insns, rtl_dump_file);
3322 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3323 timevar_pop (TV_REG_STACK);
3329 timevar_push (TV_REORDER_BLOCKS);
3330 open_dump_file (DFI_bbro, decl);
3332 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3333 splitting possibly introduced more crossjumping oppurtuntities.
3334 Except that we can't actually run crossjumping without running
3335 another DCE pass, which we can't do after reg-stack. */
3336 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3337 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3338 if (flag_reorder_blocks)
3340 reorder_basic_blocks ();
3341 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3344 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3345 timevar_pop (TV_REORDER_BLOCKS);
3347 compute_alignments ();
3349 /* CFG is no longer maintained up-to-date. */
3350 free_bb_for_insn ();
3352 /* If a machine dependent reorganization is needed, call it. */
3353 #ifdef MACHINE_DEPENDENT_REORG
3354 timevar_push (TV_MACH_DEP);
3355 open_dump_file (DFI_mach, decl);
3357 MACHINE_DEPENDENT_REORG (insns);
3359 close_dump_file (DFI_mach, print_rtl, insns);
3360 timevar_pop (TV_MACH_DEP);
3365 purge_line_number_notes (insns);
3366 cleanup_barriers ();
3368 /* If a scheduling pass for delayed branches is to be done,
3369 call the scheduling code. */
3372 if (optimize > 0 && flag_delayed_branch)
3374 timevar_push (TV_DBR_SCHED);
3375 open_dump_file (DFI_dbr, decl);
3377 dbr_schedule (insns, rtl_dump_file);
3379 close_dump_file (DFI_dbr, print_rtl, insns);
3380 timevar_pop (TV_DBR_SCHED);
3386 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3387 timevar_push (TV_SHORTEN_BRANCH);
3388 split_all_insns_noflow ();
3389 timevar_pop (TV_SHORTEN_BRANCH);
3392 convert_to_eh_region_ranges ();
3394 /* Shorten branches. */
3395 timevar_push (TV_SHORTEN_BRANCH);
3396 shorten_branches (get_insns ());
3397 timevar_pop (TV_SHORTEN_BRANCH);
3399 current_function_nothrow = nothrow_function_p ();
3400 if (current_function_nothrow)
3401 /* Now we know that this can't throw; set the flag for the benefit
3402 of other functions later in this translation unit. */
3403 TREE_NOTHROW (current_function_decl) = 1;
3405 /* Now turn the rtl into assembler code. */
3407 timevar_push (TV_FINAL);
3412 /* Get the function's name, as described by its RTL. This may be
3413 different from the DECL_NAME name used in the source file. */
3415 x = DECL_RTL (decl);
3416 if (GET_CODE (x) != MEM)
3419 if (GET_CODE (x) != SYMBOL_REF)
3421 fnname = XSTR (x, 0);
3423 assemble_start_function (decl, fnname);
3424 final_start_function (insns, asm_out_file, optimize);
3425 final (insns, asm_out_file, optimize, 0);
3426 final_end_function ();
3428 #ifdef IA64_UNWIND_INFO
3429 /* ??? The IA-64 ".handlerdata" directive must be issued before
3430 the ".endp" directive that closes the procedure descriptor. */
3431 output_function_exception_table ();
3434 assemble_end_function (decl, fnname);
3436 #ifndef IA64_UNWIND_INFO
3437 /* Otherwise, it feels unclean to switch sections in the middle. */
3438 output_function_exception_table ();
3442 fflush (asm_out_file);
3444 /* Release all memory allocated by flow. */
3445 free_basic_block_vars (0);
3447 /* Release all memory held by regsets now. */
3448 regset_release_memory ();
3450 timevar_pop (TV_FINAL);
3454 /* Write DBX symbols if requested. */
3456 /* Note that for those inline functions where we don't initially
3457 know for certain that we will be generating an out-of-line copy,
3458 the first invocation of this routine (rest_of_compilation) will
3459 skip over this code by doing a `goto exit_rest_of_compilation;'.
3460 Later on, finish_compilation will call rest_of_compilation again
3461 for those inline functions that need to have out-of-line copies
3462 generated. During that call, we *will* be routed past here. */
3464 timevar_push (TV_SYMOUT);
3465 (*debug_hooks->function_decl) (decl);
3466 timevar_pop (TV_SYMOUT);
3468 exit_rest_of_compilation:
3470 /* In case the function was not output,
3471 don't leave any temporary anonymous types
3472 queued up for sdb output. */
3473 #ifdef SDB_DEBUGGING_INFO
3474 if (write_symbols == SDB_DEBUG)
3475 sdbout_types (NULL_TREE);
3478 reload_completed = 0;
3479 flow2_completed = 0;
3482 timevar_push (TV_FINAL);
3484 /* Clear out the insn_length contents now that they are no
3486 init_insn_lengths ();
3488 /* Clear out the real_constant_chain before some of the rtx's
3489 it runs through become garbage. */
3490 clear_const_double_mem ();
3492 /* Show no temporary slots allocated. */
3495 free_basic_block_vars (0);
3496 free_bb_for_insn ();
3498 timevar_pop (TV_FINAL);
3500 /* Make sure volatile mem refs aren't considered valid operands for
3501 arithmetic insns. We must call this here if this is a nested inline
3502 function, since the above code leaves us in the init_recog state
3503 (from final.c), and the function context push/pop code does not
3504 save/restore volatile_ok.
3506 ??? Maybe it isn't necessary for expand_start_function to call this
3507 anymore if we do it here? */
3509 init_recog_no_volatile ();
3511 /* We're done with this function. Free up memory if we can. */
3512 free_after_parsing (cfun);
3513 if (! DECL_DEFER_OUTPUT (decl))
3515 free_after_compilation (cfun);
3517 /* Clear integrate.c's pointer to the cfun structure we just
3519 DECL_SAVED_INSNS (decl) = 0;
3525 timevar_pop (TV_REST_OF_COMPILATION);
3535 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3536 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3537 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3538 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3539 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3540 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"));
3542 for (i = ARRAY_SIZE (f_options); i--;)
3544 const char *description = f_options[i].description;
3546 if (description != NULL && *description != 0)
3547 printf (" -f%-21s %s\n",
3548 f_options[i].string, _(description));
3551 printf (_(" -O[number] Set optimization level to [number]\n"));
3552 printf (_(" -Os Optimize for space rather than speed\n"));
3553 for (i = LAST_PARAM; i--;)
3555 const char *description = compiler_params[i].help;
3556 const int length = 21 - strlen (compiler_params[i].option);
3558 if (description != NULL && *description != 0)
3559 printf (" --param %s=<value>%.*s%s\n",
3560 compiler_params[i].option,
3561 length > 0 ? length : 1, " ",
3564 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3565 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3566 printf (_(" -w Suppress warnings\n"));
3567 printf (_(" -W Enable extra warnings\n"));
3569 for (i = ARRAY_SIZE (W_options); i--;)
3571 const char *description = W_options[i].description;
3573 if (description != NULL && *description != 0)
3574 printf (" -W%-21s %s\n",
3575 W_options[i].string, _(description));
3578 printf (_(" -Wunused Enable unused warnings\n"));
3579 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3580 printf (_(" -p Enable function profiling\n"));
3581 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3582 printf (_(" -a Enable block profiling \n"));
3584 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3585 printf (_(" -ax Enable jump profiling \n"));
3587 printf (_(" -o <file> Place output into <file> \n"));
3589 -G <number> Put global and static data smaller than <number>\n\
3590 bytes into a special section (on some targets)\n"));
3592 for (i = ARRAY_SIZE (debug_args); i--;)
3594 if (debug_args[i].description != NULL)
3595 printf (" -g%-21s %s\n",
3596 debug_args[i].arg, _(debug_args[i].description));
3599 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3600 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3601 printf (_(" -version Display the compiler's version\n"));
3602 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3603 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3604 #if defined INSN_SCHEDULING
3605 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3607 printf (_(" --help Display this information\n"));
3612 /* Display descriptions of language specific options.
3613 If there is no description, note that there is an undocumented option.
3614 If the description is empty, do not display anything. (This allows
3615 options to be deliberately undocumented, for whatever reason).
3616 If the option string is missing, then this is a marker, indicating
3617 that the description string is in fact the name of a language, whose
3618 language specific options are to follow. */
3620 if (ARRAY_SIZE (documented_lang_options) > 1)
3622 printf (_("\nLanguage specific options:\n"));
3624 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3626 const char *description = documented_lang_options[i].description;
3627 const char *option = documented_lang_options[i].option;
3629 if (description == NULL)
3634 printf (_(" %-23.23s [undocumented]\n"), option);
3636 else if (*description == 0)
3638 else if (option == NULL)
3642 (_("\nThere are undocumented %s specific options as well.\n"),
3646 printf (_("\n Options for %s:\n"), description);
3651 printf (" %-23.23s %s\n", option, _(description));
3656 printf (_("\nThere are undocumented %s specific options as well.\n"),
3659 display_target_options ();
3663 display_target_options ()
3666 static bool displayed = false;
3668 /* Avoid double printing for --help --target-help. */
3673 if (ARRAY_SIZE (target_switches) > 1
3674 #ifdef TARGET_OPTIONS
3675 || ARRAY_SIZE (target_options) > 1
3683 printf (_("\nTarget specific options:\n"));
3685 for (i = ARRAY_SIZE (target_switches); i--;)
3687 const char *option = target_switches[i].name;
3688 const char *description = target_switches[i].description;
3690 if (option == NULL || *option == 0)
3692 else if (description == NULL)
3697 printf (_(" -m%-23.23s [undocumented]\n"), option);
3699 else if (*description != 0)
3700 doc += printf (" -m%-23.23s %s\n", option, _(description));
3703 #ifdef TARGET_OPTIONS
3704 for (i = ARRAY_SIZE (target_options); i--;)
3706 const char *option = target_options[i].prefix;
3707 const char *description = target_options[i].description;
3709 if (option == NULL || *option == 0)
3711 else if (description == NULL)
3716 printf (_(" -m%-23.23s [undocumented]\n"), option);
3718 else if (*description != 0)
3719 doc += printf (" -m%-23.23s %s\n", option, _(description));
3725 printf (_("\nThere are undocumented target specific options as well.\n"));
3727 printf (_(" They exist, but they are not documented.\n"));
3732 /* Parse a -d... command line switch. */
3735 decode_d_option (arg)
3744 for (i = 0; i < (int) DFI_MAX; ++i)
3745 dump_file[i].enabled = 1;
3751 flag_print_asm_name = 1;
3754 flag_dump_rtl_in_asm = 1;
3755 flag_print_asm_name = 1;
3758 graph_dump_format = vcg;
3761 rtl_dump_and_exit = 1;
3766 case 'D': /* These are handled by the preprocessor. */
3772 for (i = 0; i < (int) DFI_MAX; ++i)
3773 if (c == dump_file[i].debug_switch)
3775 dump_file[i].enabled = 1;
3780 warning ("unrecognized gcc debugging option: %c", c);
3785 /* Parse a -f... command line switch. ARG is the value after the -f.
3786 It is safe to access 'ARG - 2' to generate the full switch name.
3787 Return the number of strings consumed. */
3790 decode_f_option (arg)
3794 const char *option_value = NULL;
3796 /* Search for the option in the table of binary f options. */
3797 for (j = ARRAY_SIZE (f_options); j--;)
3799 if (!strcmp (arg, f_options[j].string))
3801 *f_options[j].variable = f_options[j].on_value;
3805 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3806 && ! strcmp (arg + 3, f_options[j].string))
3808 *f_options[j].variable = ! f_options[j].on_value;
3813 if (!strcmp (arg, "fast-math"))
3814 set_fast_math_flags ();
3815 else if (!strcmp (arg, "no-fast-math"))
3816 set_no_fast_math_flags ();
3817 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3818 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3821 read_integral_parameter (option_value, arg - 2,
3823 set_param_value ("max-inline-insns", val);
3825 #ifdef INSN_SCHEDULING
3826 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3827 fix_sched_param ("verbose", option_value);
3829 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3830 fix_register (option_value, 1, 1);
3831 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3832 fix_register (option_value, 0, 1);
3833 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3834 fix_register (option_value, 0, 0);
3835 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3836 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3837 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3839 = read_integral_parameter (option_value, arg - 2, align_functions);
3840 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3841 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3842 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3844 = read_integral_parameter (option_value, arg - 2, align_labels);
3845 else if ((option_value
3846 = skip_leading_substring (arg, "stack-limit-register=")))
3848 int reg = decode_reg_name (option_value);
3850 error ("unrecognized register name `%s'", option_value);
3852 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3854 else if ((option_value
3855 = skip_leading_substring (arg, "stack-limit-symbol=")))
3858 nm = ggc_strdup (option_value);
3859 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3861 else if ((option_value
3862 = skip_leading_substring (arg, "message-length=")))
3863 output_set_maximum_length
3864 (&global_dc->buffer, read_integral_parameter
3865 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3866 else if ((option_value
3867 = skip_leading_substring (arg, "diagnostics-show-location=")))
3869 if (!strcmp (option_value, "once"))
3870 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3871 else if (!strcmp (option_value, "every-line"))
3872 diagnostic_prefixing_rule (global_dc)
3873 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3875 error ("unrecognized option `%s'", arg - 2);
3877 else if (!strcmp (arg, "no-stack-limit"))
3878 stack_limit_rtx = NULL_RTX;
3879 else if (!strcmp (arg, "preprocessed"))
3880 /* Recognise this switch but do nothing. This prevents warnings
3881 about an unrecognized switch if cpplib has not been linked in. */
3889 /* Parse a -W... command line switch. ARG is the value after the -W.
3890 It is safe to access 'ARG - 2' to generate the full switch name.
3891 Return the number of strings consumed. */
3894 decode_W_option (arg)
3897 const char *option_value = NULL;
3900 /* Search for the option in the table of binary W options. */
3902 for (j = ARRAY_SIZE (W_options); j--;)
3904 if (!strcmp (arg, W_options[j].string))
3906 *W_options[j].variable = W_options[j].on_value;
3910 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3911 && ! strcmp (arg + 3, W_options[j].string))
3913 *W_options[j].variable = ! W_options[j].on_value;
3918 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3919 warning ("-Wid-clash-LEN is no longer supported");
3920 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3922 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3924 warn_larger_than = larger_than_size != -1;
3926 else if (!strcmp (arg, "unused"))
3930 else if (!strcmp (arg, "no-unused"))
3940 /* Parse a -g... command line switch. ARG is the value after the -g.
3941 It is safe to access 'ARG - 2' to generate the full switch name.
3942 Return the number of strings consumed. */
3945 decode_g_option (arg)
3948 static unsigned level = 0;
3949 /* A lot of code assumes write_symbols == NO_DEBUG if the
3950 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3951 of what debugging type has been selected). This records the
3952 selected type. It is an error to specify more than one
3954 static enum debug_info_type selected_debug_type = NO_DEBUG;
3955 /* Non-zero if debugging format has been explicitly set.
3956 -g and -ggdb don't explicitly set the debugging format so
3957 -gdwarf -g3 is equivalent to -gdwarf3. */
3958 static int type_explicitly_set_p = 0;
3959 /* Indexed by enum debug_info_type. */
3960 static const char *const debug_type_names[] =
3962 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3965 /* The maximum admissible debug level value. */
3966 static const unsigned max_debug_level = 3;
3968 /* Look up ARG in the table. */
3969 for (da = debug_args; da->arg; da++)
3971 const int da_len = strlen (da->arg);
3973 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3975 enum debug_info_type type = da->debug_type;
3976 const char *p = arg + da_len;
3978 if (*p && ! ISDIGIT (*p))
3981 /* A debug flag without a level defaults to level 2.
3982 Note we do not want to call read_integral_parameter
3983 for that case since it will call atoi which
3986 ??? We may want to generalize the interface to
3987 read_integral_parameter to better handle this case
3988 if this case shows up often. */
3990 level = read_integral_parameter (p, 0, max_debug_level + 1);
3992 level = (level == 0) ? 2 : level;
3994 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
3996 error ("use -gdwarf -g%d for DWARF v1, level %d",
3999 error ("use -gdwarf-2 for DWARF v2");
4002 if (level > max_debug_level)
4005 ignoring option `%s' due to invalid debug level specification",
4007 level = debug_info_level;
4010 if (type == NO_DEBUG)
4012 type = PREFERRED_DEBUGGING_TYPE;
4014 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4016 #ifdef DWARF2_DEBUGGING_INFO
4017 type = DWARF2_DEBUG;
4019 #ifdef DBX_DEBUGGING_INFO
4026 if (type == NO_DEBUG)
4027 warning ("`%s': unknown or unsupported -g option", arg - 2);
4029 /* Does it conflict with an already selected type? */
4030 if (type_explicitly_set_p
4031 /* -g/-ggdb don't conflict with anything. */
4032 && da->debug_type != NO_DEBUG
4033 && type != selected_debug_type)
4034 warning ("`%s' ignored, conflicts with `-g%s'",
4035 arg - 2, debug_type_names[(int) selected_debug_type]);
4038 /* If the format has already been set, -g/-ggdb
4039 only change the debug level. */
4040 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4041 /* Don't change debugging type. */
4045 selected_debug_type = type;
4046 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4049 write_symbols = (level == 0
4051 : selected_debug_type);
4052 use_gnu_debug_info_extensions = da->use_extensions_p;
4053 debug_info_level = (enum debug_info_level) level;
4066 /* Decode the first argument in the argv as a language-independent option.
4067 Return the number of strings consumed. */
4070 independent_decode_option (argc, argv)
4074 char *arg = argv[0];
4076 if (arg[0] != '-' || arg[1] == 0)
4088 if (!strcmp (arg, "-help"))
4091 exit_after_options = 1;
4094 if (!strcmp (arg, "-target-help"))
4096 display_target_options ();
4097 exit_after_options = 1;
4100 if (!strcmp (arg, "-version"))
4102 print_version (stderr, "");
4103 exit_after_options = 1;
4106 /* Handle '--param <name>=<value>'. */
4107 if (strcmp (arg, "-param") == 0)
4113 error ("-param option missing argument");
4117 /* Get the '<name>=<value>' parameter. */
4119 /* Look for the `='. */
4120 equal = strchr (arg, '=');
4122 error ("invalid --param option: %s", arg);
4127 /* Zero out the `=' sign so that we get two separate strings. */
4129 /* Figure out what value is specified. */
4130 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4131 if (val != INVALID_PARAM_VAL)
4132 set_param_value (arg, val);
4134 error ("invalid parameter value `%s'", equal + 1);
4149 /* Already been treated in main (). Do nothing. */
4153 set_target_switch (arg + 1);
4157 return decode_f_option (arg + 1);
4160 return decode_g_option (arg + 1);
4163 if (!strcmp (arg, "dumpbase"))
4168 dump_base_name = argv[1];
4172 decode_d_option (arg + 1);
4176 if (!strcmp (arg, "pedantic"))
4178 else if (!strcmp (arg, "pedantic-errors"))
4179 flag_pedantic_errors = pedantic = 1;
4180 else if (arg[1] == 0)
4187 if (!strcmp (arg, "quiet"))
4194 if (!strcmp (arg, "version"))
4202 inhibit_warnings = 1;
4211 /* We save the value of warn_uninitialized, since if they put
4212 -Wuninitialized on the command line, we need to generate a
4213 warning about not using it without also specifying -O. */
4214 if (warn_uninitialized != 1)
4215 warn_uninitialized = 2;
4218 return decode_W_option (arg + 1);
4222 if (!strncmp (arg, "aux-info", 8))
4229 aux_info_file_name = argv[1];
4230 flag_gen_aux_info = 1;
4233 else if (arg[8] == '=')
4235 aux_info_file_name = arg + 9;
4236 flag_gen_aux_info = 1;
4251 asm_file_name = argv[1];
4266 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4271 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4275 if (g_switch_val == -1)
4279 g_switch_set = TRUE;
4280 g_switch_value = g_switch_val;
4290 /* Decode -m switches. */
4291 /* Decode the switch -mNAME. */
4294 set_target_switch (name)
4298 int valid_target_option = 0;
4300 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4301 if (!strcmp (target_switches[j].name, name))
4303 if (target_switches[j].value < 0)
4304 target_flags &= ~-target_switches[j].value;
4306 target_flags |= target_switches[j].value;
4307 valid_target_option = 1;
4310 #ifdef TARGET_OPTIONS
4311 if (!valid_target_option)
4312 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4314 int len = strlen (target_options[j].prefix);
4315 if (!strncmp (target_options[j].prefix, name, len))
4317 *target_options[j].variable = name + len;
4318 valid_target_option = 1;
4323 if (!valid_target_option)
4324 error ("invalid option `%s'", name);
4327 /* Print version information to FILE.
4328 Each line begins with INDENT (for the case where FILE is the
4329 assembler output file). */
4332 print_version (file, indent)
4337 #define __VERSION__ "[?]"
4341 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4343 "%s%s%s version %s (%s) compiled by CC.\n"
4345 , indent, *indent != 0 ? " " : "",
4346 lang_hooks.name, version_string, TARGET_NAME,
4347 indent, __VERSION__);
4350 /* Print an option value and return the adjusted position in the line.
4351 ??? We don't handle error returns from fprintf (disk full); presumably
4352 other code will catch a disk full though. */
4355 print_single_switch (file, pos, max, indent, sep, term, type, name)
4358 const char *indent, *sep, *term, *type, *name;
4360 /* The ultrix fprintf returns 0 on success, so compute the result we want
4361 here since we need it for the following test. */
4362 int len = strlen (sep) + strlen (type) + strlen (name);
4367 fprintf (file, "%s", term);
4372 fprintf (file, "%s", indent);
4373 pos = strlen (indent);
4375 fprintf (file, "%s%s%s", sep, type, name);
4380 /* Print active target switches to FILE.
4381 POS is the current cursor position and MAX is the size of a "line".
4382 Each line begins with INDENT and ends with TERM.
4383 Each switch is separated from the next by SEP. */
4386 print_switch_values (file, pos, max, indent, sep, term)
4389 const char *indent, *sep, *term;
4394 /* Print the options as passed. */
4396 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4397 _("options passed: "), "");
4399 for (p = &save_argv[1]; *p != NULL; p++)
4403 if (strcmp (*p, "-o") == 0)
4409 if (strcmp (*p, "-quiet") == 0)
4411 if (strcmp (*p, "-version") == 0)
4416 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4419 fprintf (file, "%s", term);
4421 /* Print the -f and -m options that have been enabled.
4422 We don't handle language specific options but printing argv
4425 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4426 _("options enabled: "), "");
4428 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4429 if (*f_options[j].variable == f_options[j].on_value)
4430 pos = print_single_switch (file, pos, max, indent, sep, term,
4431 "-f", f_options[j].string);
4433 /* Print target specific options. */
4435 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4436 if (target_switches[j].name[0] != '\0'
4437 && target_switches[j].value > 0
4438 && ((target_switches[j].value & target_flags)
4439 == target_switches[j].value))
4441 pos = print_single_switch (file, pos, max, indent, sep, term,
4442 "-m", target_switches[j].name);
4445 #ifdef TARGET_OPTIONS
4446 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4447 if (*target_options[j].variable != NULL)
4450 sprintf (prefix, "-m%s", target_options[j].prefix);
4451 pos = print_single_switch (file, pos, max, indent, sep, term,
4452 prefix, *target_options[j].variable);
4456 fprintf (file, "%s", term);
4459 /* Open assembly code output file. Do this even if -fsyntax-only is
4460 on, because then the driver will have provided the name of a
4461 temporary file or bit bucket for us. NAME is the file specified on
4462 the command line, possibly NULL. */
4464 init_asm_output (name)
4467 if (name == NULL && asm_file_name == 0)
4468 asm_out_file = stdout;
4471 if (asm_file_name == 0)
4473 int len = strlen (dump_base_name);
4474 char *dumpname = (char *) xmalloc (len + 6);
4475 memcpy (dumpname, dump_base_name, len + 1);
4476 strip_off_ending (dumpname, len);
4477 strcat (dumpname, ".s");
4478 asm_file_name = dumpname;
4480 if (!strcmp (asm_file_name, "-"))
4481 asm_out_file = stdout;
4483 asm_out_file = fopen (asm_file_name, "w");
4484 if (asm_out_file == 0)
4485 fatal_io_error ("can't open %s for writing", asm_file_name);
4488 #ifdef IO_BUFFER_SIZE
4489 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4490 _IOFBF, IO_BUFFER_SIZE);
4493 if (!flag_syntax_only)
4495 #ifdef ASM_FILE_START
4496 ASM_FILE_START (asm_out_file);
4499 #ifdef ASM_COMMENT_START
4500 if (flag_verbose_asm)
4502 /* Print the list of options in effect. */
4503 print_version (asm_out_file, ASM_COMMENT_START);
4504 print_switch_values (asm_out_file, 0, MAX_LINE,
4505 ASM_COMMENT_START, " ", "\n");
4506 /* Add a blank line here so it appears in assembler output but not
4508 fprintf (asm_out_file, "\n");
4514 /* Initialization of the front end environment, before command line
4515 options are parsed. Signal handlers, internationalization etc.
4516 ARGV0 is main's argv[0]. */
4518 general_init (argv0)
4523 p = argv0 + strlen (argv0);
4524 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4528 xmalloc_set_program_name (progname);
4530 gcc_init_libintl ();
4532 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4534 signal (SIGSEGV, crash_signal);
4537 signal (SIGILL, crash_signal);
4540 signal (SIGBUS, crash_signal);
4543 signal (SIGABRT, crash_signal);
4545 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4546 signal (SIGIOT, crash_signal);
4549 signal (SIGFPE, crash_signal);
4552 /* Initialize the diagnostics reporting machinery, so option parsing
4553 can give warnings and errors. */
4554 diagnostic_initialize (global_dc);
4557 /* Parse command line options and set default flag values, called
4558 after language-independent option-independent initialization. Do
4559 minimal options processing. Outputting diagnostics is OK, but GC
4560 and identifier hashtables etc. are not initialized yet. */
4562 parse_options_and_default_flags (argc, argv)
4568 /* Save in case md file wants to emit args as a comment. */
4572 /* Initialize register usage now so switches may override. */
4575 /* Register the language-independent parameters. */
4576 add_params (lang_independent_params, LAST_PARAM);
4578 /* Perform language-specific options initialization. */
4579 (*lang_hooks.init_options) ();
4581 /* Scan to see what optimization level has been specified. That will
4582 determine the default value of many flags. */
4583 for (i = 1; i < argc; i++)
4585 if (!strcmp (argv[i], "-O"))
4590 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4592 /* Handle -Os, -O2, -O3, -O69, ... */
4593 char *p = &argv[i][2];
4595 if ((p[0] == 's') && (p[1] == 0))
4599 /* Optimizing for size forces optimize to be 2. */
4604 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4605 if (optimize_val != -1)
4607 optimize = optimize_val;
4616 flag_merge_constants = 0;
4622 flag_thread_jumps = 1;
4624 flag_delayed_branch = 1;
4626 #ifdef CAN_DEBUG_WITHOUT_FP
4627 flag_omit_frame_pointer = 1;
4629 flag_guess_branch_prob = 1;
4630 flag_cprop_registers = 1;
4631 flag_loop_optimize = 1;
4632 flag_crossjumping = 1;
4633 flag_if_conversion = 1;
4634 flag_if_conversion2 = 1;
4639 flag_optimize_sibling_calls = 1;
4640 flag_cse_follow_jumps = 1;
4641 flag_cse_skip_blocks = 1;
4643 flag_expensive_optimizations = 1;
4644 flag_strength_reduce = 1;
4645 flag_rerun_cse_after_loop = 1;
4646 flag_rerun_loop_opt = 1;
4647 flag_caller_saves = 1;
4650 #ifdef INSN_SCHEDULING
4651 flag_schedule_insns = 1;
4652 flag_schedule_insns_after_reload = 1;
4655 flag_strict_aliasing = 1;
4656 flag_delete_null_pointer_checks = 1;
4657 flag_reorder_blocks = 1;
4662 flag_inline_functions = 1;
4663 flag_rename_registers = 1;
4666 if (optimize < 2 || optimize_size)
4671 align_functions = 1;
4674 /* Initialize whether `char' is signed. */
4675 flag_signed_char = DEFAULT_SIGNED_CHAR;
4676 #ifdef DEFAULT_SHORT_ENUMS
4677 /* Initialize how much space enums occupy, by default. */
4678 flag_short_enums = DEFAULT_SHORT_ENUMS;
4681 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4684 set_target_switch ("");
4686 /* Unwind tables are always present in an ABI-conformant IA-64
4687 object file, so the default should be ON. */
4688 #ifdef IA64_UNWIND_INFO
4689 flag_unwind_tables = IA64_UNWIND_INFO;
4692 #ifdef OPTIMIZATION_OPTIONS
4693 /* Allow default optimizations to be specified on a per-machine basis. */
4694 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4697 /* Perform normal command line switch decoding. */
4698 for (i = 1; i < argc;)
4701 int indep_processed;
4703 /* Give the language a chance to decode the option for itself. */
4704 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4706 if (lang_processed >= 0)
4707 /* Now see if the option also has a language independent meaning.
4708 Some options are both language specific and language independent,
4710 indep_processed = independent_decode_option (argc - i, argv + i);
4713 lang_processed = -lang_processed;
4714 indep_processed = 0;
4717 if (lang_processed || indep_processed)
4718 i += MAX (lang_processed, indep_processed);
4721 const char *option = NULL;
4722 const char *lang = NULL;
4725 /* It is possible that the command line switch is not valid for the
4726 current language, but it is valid for another language. In order
4727 to be compatible with previous versions of the compiler (which
4728 did not issue an error message in this case) we check for this
4729 possibility here. If we do find a match, then if extra_warnings
4730 is set we generate a warning message, otherwise we will just
4731 ignore the option. */
4732 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4734 option = documented_lang_options[j].option;
4737 lang = documented_lang_options[j].description;
4738 else if (! strncmp (argv[i], option, strlen (option)))
4742 if (j != ARRAY_SIZE (documented_lang_options))
4746 warning ("ignoring command line option '%s'", argv[i]);
4749 ("(it is valid for %s but not the selected language)",
4753 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4754 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4756 error ("unrecognized option `%s'", argv[i]);
4762 if (flag_no_inline == 2)
4765 flag_really_no_inline = flag_no_inline;
4767 /* Set flag_no_inline before the post_options () hook. The C front
4768 ends use it to determine tree inlining defaults. FIXME: such
4769 code should be lang-independent when all front ends use tree
4770 inlining, in which case it, and this condition, should be moved
4771 to the top of process_options() instead. */
4774 /* Inlining does not work if not optimizing,
4775 so force it not to be done. */
4779 /* The c_decode_option function and decode_option hook set
4780 this to `2' if -Wall is used, so we can avoid giving out
4781 lots of errors for people who don't realize what -Wall does. */
4782 if (warn_uninitialized == 1)
4783 warning ("-Wuninitialized is not supported without -O");
4786 if (flag_really_no_inline == 2)
4787 flag_really_no_inline = flag_no_inline;
4789 /* All command line options have been parsed; allow the front end to
4790 perform consistency checks, etc. */
4791 (*lang_hooks.post_options) ();
4794 /* Process the options that have been parsed. */
4798 #ifdef OVERRIDE_OPTIONS
4799 /* Some machines may reject certain combinations of options. */
4803 /* Set up the align_*_log variables, defaulting them to 1 if they
4804 were still unset. */
4805 if (align_loops <= 0) align_loops = 1;
4806 if (align_loops_max_skip > align_loops || !align_loops)
4807 align_loops_max_skip = align_loops - 1;
4808 align_loops_log = floor_log2 (align_loops * 2 - 1);
4809 if (align_jumps <= 0) align_jumps = 1;
4810 if (align_jumps_max_skip > align_jumps || !align_jumps)
4811 align_jumps_max_skip = align_jumps - 1;
4812 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4813 if (align_labels <= 0) align_labels = 1;
4814 align_labels_log = floor_log2 (align_labels * 2 - 1);
4815 if (align_labels_max_skip > align_labels || !align_labels)
4816 align_labels_max_skip = align_labels - 1;
4817 if (align_functions <= 0) align_functions = 1;
4818 align_functions_log = floor_log2 (align_functions * 2 - 1);
4820 /* Unrolling all loops implies that standard loop unrolling must also
4822 if (flag_unroll_all_loops)
4823 flag_unroll_loops = 1;
4824 /* Loop unrolling requires that strength_reduction be on also. Silently
4825 turn on strength reduction here if it isn't already on. Also, the loop
4826 unrolling code assumes that cse will be run after loop, so that must
4827 be turned on also. */
4828 if (flag_unroll_loops)
4830 flag_strength_reduce = 1;
4831 flag_rerun_cse_after_loop = 1;
4834 if (flag_non_call_exceptions)
4835 flag_asynchronous_unwind_tables = 1;
4836 if (flag_asynchronous_unwind_tables)
4837 flag_unwind_tables = 1;
4839 /* Warn about options that are not supported on this machine. */
4840 #ifndef INSN_SCHEDULING
4841 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4842 warning ("instruction scheduling not supported on this target machine");
4845 if (flag_delayed_branch)
4846 warning ("this target machine does not have delayed branches");
4849 /* Some operating systems do not allow profiling without a frame
4851 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4853 && flag_omit_frame_pointer)
4855 error ("profiling does not work without a frame pointer");
4856 flag_omit_frame_pointer = 0;
4859 user_label_prefix = USER_LABEL_PREFIX;
4860 if (flag_leading_underscore != -1)
4862 /* If the default prefix is more complicated than "" or "_",
4863 issue a warning and ignore this option. */
4864 if (user_label_prefix[0] == 0 ||
4865 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4867 user_label_prefix = flag_leading_underscore ? "_" : "";
4870 warning ("-f%sleading-underscore not supported on this target machine",
4871 flag_leading_underscore ? "" : "no-");
4874 /* If we are in verbose mode, write out the version and maybe all the
4875 option flags in use. */
4878 print_version (stderr, "");
4880 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4886 if (flag_syntax_only)
4888 write_symbols = NO_DEBUG;
4892 /* Now we know write_symbols, set up the debug hooks based on it.
4893 By default we do nothing for debug output. */
4894 #if defined(DBX_DEBUGGING_INFO)
4895 if (write_symbols == DBX_DEBUG)
4896 debug_hooks = &dbx_debug_hooks;
4898 #if defined(XCOFF_DEBUGGING_INFO)
4899 if (write_symbols == XCOFF_DEBUG)
4900 debug_hooks = &xcoff_debug_hooks;
4902 #ifdef SDB_DEBUGGING_INFO
4903 if (write_symbols == SDB_DEBUG)
4904 debug_hooks = &sdb_debug_hooks;
4906 #ifdef DWARF_DEBUGGING_INFO
4907 if (write_symbols == DWARF_DEBUG)
4908 debug_hooks = &dwarf_debug_hooks;
4910 #ifdef DWARF2_DEBUGGING_INFO
4911 if (write_symbols == DWARF2_DEBUG)
4912 debug_hooks = &dwarf2_debug_hooks;
4914 #ifdef VMS_DEBUGGING_INFO
4915 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4916 debug_hooks = &vmsdbg_debug_hooks;
4919 /* If auxiliary info generation is desired, open the output file.
4920 This goes in the same directory as the source file--unlike
4921 all the other output files. */
4922 if (flag_gen_aux_info)
4924 aux_info_file = fopen (aux_info_file_name, "w");
4925 if (aux_info_file == 0)
4926 fatal_io_error ("can't open %s", aux_info_file_name);
4929 if (! targetm.have_named_sections)
4931 if (flag_function_sections)
4933 warning ("-ffunction-sections not supported for this target");
4934 flag_function_sections = 0;
4936 if (flag_data_sections)
4938 warning ("-fdata-sections not supported for this target");
4939 flag_data_sections = 0;
4943 if (flag_function_sections && profile_flag)
4945 warning ("-ffunction-sections disabled; it makes profiling impossible");
4946 flag_function_sections = 0;
4949 #ifndef HAVE_prefetch
4950 if (flag_prefetch_loop_arrays)
4952 warning ("-fprefetch-loop-arrays not supported for this target");
4953 flag_prefetch_loop_arrays = 0;
4956 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4958 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4959 flag_prefetch_loop_arrays = 0;
4963 /* This combination of options isn't handled for i386 targets and doesn't
4964 make much sense anyway, so don't allow it. */
4965 if (flag_prefetch_loop_arrays && optimize_size)
4967 warning ("-fprefetch-loop-arrays is not supported with -Os");
4968 flag_prefetch_loop_arrays = 0;
4971 #ifndef OBJECT_FORMAT_ELF
4972 if (flag_function_sections && write_symbols != NO_DEBUG)
4973 warning ("-ffunction-sections may affect debugging on some targets");
4977 /* Language-independent initialization, before language-dependent
4980 lang_independent_init ()
4982 /* Initialize the garbage-collector, and string pools. */
4984 ggc_add_rtx_root (&stack_limit_rtx, 1);
4985 ggc_add_tree_root (¤t_function_decl, 1);
4986 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4991 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4992 || debug_info_level == DINFO_LEVEL_VERBOSE
4993 #ifdef VMS_DEBUGGING_INFO
4994 /* Enable line number info for traceback */
4995 || debug_info_level > DINFO_LEVEL_NONE
4997 || flag_test_coverage
4998 || warn_notreached);
5004 init_function_once ();
5005 init_stor_layout_once ();
5006 init_varasm_once ();
5007 init_EXPR_INSN_LIST_cache ();
5009 /* The following initialization functions need to generate rtl, so
5010 provide a dummy function context for them. */
5011 init_dummy_function_start ();
5014 if (flag_caller_saves)
5015 init_caller_save ();
5016 expand_dummy_function_end ();
5019 /* Language-dependent initialization. Returns non-zero on success. */
5021 lang_dependent_init (name)
5024 if (dump_base_name == 0)
5025 dump_base_name = name ? name : "gccdump";
5027 /* Front-end initialization. This hook can assume that GC,
5028 identifier hashes etc. are set up, but debug initialization is
5029 not done yet. This routine must return the original filename
5030 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5031 name = (*lang_hooks.init) (name);
5035 /* Is this duplication necessary? */
5036 name = ggc_strdup (name);
5037 main_input_filename = input_filename = name;
5038 init_asm_output (name);
5040 /* These create various _DECL nodes, so need to be called after the
5041 front end is initialized. */
5045 /* Put an entry on the input file stack for the main input file. */
5046 push_srcloc (input_filename, 0);
5048 /* If dbx symbol table desired, initialize writing it and output the
5049 predefined types. */
5050 timevar_push (TV_SYMOUT);
5052 #ifdef DWARF2_UNWIND_INFO
5053 if (dwarf2out_do_frame ())
5054 dwarf2out_frame_init ();
5057 /* Now we have the correct original filename, we can initialize
5059 (*debug_hooks->init) (name);
5061 timevar_pop (TV_SYMOUT);
5066 /* Clean up: close opened files, etc. */
5071 /* Close the dump files. */
5072 if (flag_gen_aux_info)
5074 fclose (aux_info_file);
5076 unlink (aux_info_file_name);
5079 /* Close non-debugging input and output files. Take special care to note
5080 whether fclose returns an error, since the pages might still be on the
5081 buffer chain while the file is open. */
5085 if (ferror (asm_out_file) != 0)
5086 fatal_io_error ("error writing to %s", asm_file_name);
5087 if (fclose (asm_out_file) != 0)
5088 fatal_io_error ("error closing %s", asm_file_name);
5091 /* Do whatever is necessary to finish printing the graphs. */
5092 if (graph_dump_format != no_graph)
5096 for (i = 0; i < (int) DFI_MAX; ++i)
5097 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5102 sprintf (seq, DUMPFILE_FORMAT, i);
5103 suffix = concat (seq, dump_file[i].extension, NULL);
5104 finish_graph_dump_file (dump_base_name, suffix);
5111 ggc_print_statistics ();
5112 stringpool_statistics ();
5113 dump_tree_statistics ();
5116 /* Free up memory for the benefit of leak detectors. */
5119 /* Language-specific end of compilation actions. */
5120 (*lang_hooks.finish) ();
5123 /* Initialize the compiler, and compile the input file. */
5127 /* The bulk of command line switch processing. */
5130 /* We cannot start timing until after options are processed since that
5131 says if we run timers or not. */
5133 timevar_start (TV_TOTAL);
5135 /* Language-independent initialization. Also sets up GC, identifier
5137 lang_independent_init ();
5139 /* Language-dependent initialization. Returns true on success. */
5140 if (lang_dependent_init (filename))
5145 /* Stop timing and print the times. */
5146 timevar_stop (TV_TOTAL);
5147 timevar_print (stderr);
5150 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5151 Decode command args, then call compile_file.
5152 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5153 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5155 It is not safe to call this function more than once. */
5158 toplev_main (argc, argv)
5164 /* Initialization of GCC's environment, and diagnostics. */
5165 general_init (argv[0]);
5167 /* Parse the options and do minimal processing; basically just
5168 enough to default flags appropriately. */
5169 parse_options_and_default_flags (argc, argv);
5171 /* Exit early if we can (e.g. -help). */
5172 if (!exit_after_options)
5175 if (errorcount || sorrycount)
5176 return (FATAL_EXIT_CODE);
5178 return (SUCCESS_EXIT_CODE);