1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
79 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
80 #include "dwarf2out.h"
83 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
87 #ifdef SDB_DEBUGGING_INFO
91 #ifdef XCOFF_DEBUGGING_INFO
92 #include "xcoffout.h" /* Needed for external data
93 declarations for e.g. AIX 4.x. */
96 /* Carry information from ASM_DECLARE_OBJECT_NAME
97 to ASM_FINISH_DECLARE_OBJECT. */
99 extern int size_directive_output;
100 extern tree last_assemble_variable_decl;
102 extern void reg_alloc PARAMS ((void));
104 static void general_init PARAMS ((char *));
105 static void parse_options_and_default_flags PARAMS ((int, char **));
106 static void do_compile PARAMS ((int));
107 static void process_options PARAMS ((void));
108 static void backend_init PARAMS ((void));
109 static int lang_dependent_init PARAMS ((const char *));
110 static void init_asm_output PARAMS ((const char *));
111 static void finalize PARAMS ((void));
113 static void set_target_switch PARAMS ((const char *));
115 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping PARAMS ((void));
117 static void compile_file PARAMS ((void));
118 static void display_help PARAMS ((void));
119 static void display_target_options PARAMS ((void));
121 static void decode_d_option PARAMS ((const char *));
122 static int decode_f_option PARAMS ((const char *));
123 static int decode_W_option PARAMS ((const char *));
124 static int decode_g_option PARAMS ((const char *));
125 static unsigned int independent_decode_option PARAMS ((int, char **));
127 static void print_version PARAMS ((FILE *, const char *));
128 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
129 const char *, const char *,
130 const char *, const char *));
131 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
132 const char *, const char *));
134 /* Nonzero to dump debug info whilst parsing (-dy option). */
135 static int set_yydebug;
137 /* Length of line when printing switch values. */
140 /* Name of program invoked, sans directories. */
142 const char *progname;
144 /* Copy of arguments to toplev_main. */
148 /* Name of current original source file (what was input to cpp).
149 This comes from each #-command in the actual input. */
151 const char *input_filename;
153 /* Name of top-level original source file (what was input to cpp).
154 This comes from the #-command at the beginning of the actual input.
155 If there isn't any there, then this is the cc1 input file name. */
157 const char *main_input_filename;
159 /* Current line number in real source file. */
163 /* Nonzero if it is unsafe to create any new pseudo registers. */
166 /* Stack of currently pending input files. */
168 struct file_stack *input_file_stack;
170 /* Incremented on each change to input_file_stack. */
171 int input_file_stack_tick;
173 /* Name to use as base of names for dump output files. */
175 const char *dump_base_name;
177 /* Name to use as a base for auxiliary output files. */
179 static const char *aux_base_name;
181 /* Format to use to print dumpfile index value */
182 #ifndef DUMPFILE_FORMAT
183 #define DUMPFILE_FORMAT ".%02d."
186 /* Bit flags that specify the machine subtype we are compiling for.
187 Bits are tested using macros TARGET_... defined in the tm.h file
188 and set by `-m...' switches. Must be defined in rtlanal.c. */
190 extern int target_flags;
192 /* A mask of target_flags that includes bit X if X was set or cleared
193 on the command line. */
195 int target_flags_explicit;
197 /* Debug hooks - dependent upon command line options. */
199 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
201 /* Describes a dump file. */
203 struct dump_file_info
205 /* The unique extension to apply, e.g. ".jump". */
206 const char *const extension;
208 /* The -d<c> character that enables this dump file. */
209 char const debug_switch;
211 /* True if there is a corresponding graph dump file. */
212 char const graph_dump_p;
214 /* True if the user selected this dump. */
217 /* True if the files have been initialized (ie truncated). */
221 /* Enumerate the extant dump files. */
265 /* Describes all the dump files. Should be kept in order of the
266 pass and in sync with dump_file_index above.
268 Remaining -d letters:
274 static struct dump_file_info dump_file[DFI_MAX] =
276 { "rtl", 'r', 0, 0, 0 },
277 { "sibling", 'i', 0, 0, 0 },
278 { "eh", 'h', 0, 0, 0 },
279 { "jump", 'j', 0, 0, 0 },
280 { "ssa", 'e', 1, 0, 0 },
281 { "ssaccp", 'W', 1, 0, 0 },
282 { "ssadce", 'X', 1, 0, 0 },
283 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
284 { "null", 'u', 0, 0, 0 },
285 { "cse", 's', 0, 0, 0 },
286 { "addressof", 'F', 0, 0, 0 },
287 { "gcse", 'G', 1, 0, 0 },
288 { "loop", 'L', 1, 0, 0 },
289 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
290 { "cfg", 'f', 1, 0, 0 },
291 { "bp", 'b', 1, 0, 0 },
292 { "ce1", 'C', 1, 0, 0 },
293 { "tracer", 'T', 1, 0, 0 },
294 { "loop2", 'L', 1, 0, 0 },
295 { "cse2", 't', 1, 0, 0 },
296 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
297 { "combine", 'c', 1, 0, 0 },
298 { "ce2", 'C', 1, 0, 0 },
299 { "regmove", 'N', 1, 0, 0 },
300 { "sched", 'S', 1, 0, 0 },
301 { "lreg", 'l', 1, 0, 0 },
302 { "greg", 'g', 1, 0, 0 },
303 { "postreload", 'o', 1, 0, 0 },
304 { "flow2", 'w', 1, 0, 0 },
305 { "peephole2", 'z', 1, 0, 0 },
306 { "rnreg", 'n', 1, 0, 0 },
307 { "ce3", 'E', 1, 0, 0 },
308 { "bbro", 'B', 1, 0, 0 },
309 { "sched2", 'R', 1, 0, 0 },
310 { "stack", 'k', 1, 0, 0 },
311 { "mach", 'M', 1, 0, 0 },
312 { "dbr", 'd', 0, 0, 0 },
315 static int open_dump_file PARAMS ((enum dump_file_index, tree));
316 static void close_dump_file PARAMS ((enum dump_file_index,
317 void (*) (FILE *, rtx), rtx));
319 /* Other flags saying which kinds of debugging dump have been requested. */
321 int rtl_dump_and_exit;
322 int flag_print_asm_name;
323 static int version_flag;
324 static const char *filename;
325 enum graph_dump_types graph_dump_format;
327 /* Name for output file of assembly code, specified with -o. */
331 /* Value of the -G xx switch, and whether it was passed or not. */
335 /* Type(s) of debugging information we are producing (if any).
336 See flags.h for the definitions of the different possible
337 types of debugging information. */
338 enum debug_info_type write_symbols = NO_DEBUG;
340 /* Level of debugging information we are producing. See flags.h
341 for the definitions of the different possible levels. */
342 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
344 /* Nonzero means use GNU-only extensions in the generated symbolic
345 debugging information. */
346 /* Currently, this only has an effect when write_symbols is set to
347 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
348 int use_gnu_debug_info_extensions = 0;
350 /* Nonzero means do optimizations. -O.
351 Particular numeric values stand for particular amounts of optimization;
352 thus, -O2 stores 2 here. However, the optimizations beyond the basic
353 ones are not controlled directly by this variable. Instead, they are
354 controlled by individual `flag_...' variables that are defaulted
355 based on this variable. */
359 /* Nonzero means optimize for size. -Os.
360 The only valid values are zero and nonzero. When optimize_size is
361 nonzero, optimize defaults to 2, but certain individual code
362 bloating optimizations are disabled. */
364 int optimize_size = 0;
366 /* Nonzero if we should exit after parsing options. */
367 static int exit_after_options = 0;
369 /* The FUNCTION_DECL for the function currently being compiled,
370 or 0 if between functions. */
371 tree current_function_decl;
373 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
375 tree current_function_func_begin_label;
377 /* Nonzero if doing dwarf2 duplicate elimination. */
379 int flag_eliminate_dwarf2_dups = 0;
381 /* Nonzero if doing unused type elimination. */
383 int flag_eliminate_unused_debug_types = 1;
385 /* Nonzero if generating code to do profiling. */
387 int profile_flag = 0;
389 /* Nonzero if generating code to profile program flow graph arcs. */
391 int profile_arc_flag = 0;
393 /* Nonzero if generating info for gcov to calculate line test coverage. */
395 int flag_test_coverage = 0;
397 /* Nonzero indicates that branch taken probabilities should be calculated. */
399 int flag_branch_probabilities = 0;
401 /* Nonzero if basic blocks should be reordered. */
403 int flag_reorder_blocks = 0;
405 /* Nonzero if functions should be reordered. */
407 int flag_reorder_functions = 0;
409 /* Nonzero if registers should be renamed. */
411 int flag_rename_registers = 0;
412 int flag_cprop_registers = 0;
414 /* Nonzero for -pedantic switch: warn about anything
415 that standard spec forbids. */
419 /* Temporarily suppress certain warnings.
420 This is set while reading code from a system header file. */
422 int in_system_header = 0;
424 /* Don't print functions as they are compiled. -quiet. */
428 /* Print times taken by the various passes. -ftime-report. */
432 /* Print memory still in use at end of compilation (which may have little
433 to do with peak memory consumption). -fmem-report. */
437 /* Nonzero means to collect statistics which might be expensive
438 and to print them when we are done. */
439 int flag_detailed_statistics = 0;
444 /* Nonzero means `char' should be signed. */
446 int flag_signed_char;
448 /* Nonzero means give an enum type only as many bytes as it needs. */
450 int flag_short_enums;
452 /* Nonzero for -fcaller-saves: allocate values in regs that need to
453 be saved across function calls, if that produces overall better code.
454 Optional now, so people can test it. */
456 #ifdef DEFAULT_CALLER_SAVES
457 int flag_caller_saves = 1;
459 int flag_caller_saves = 0;
462 /* Nonzero if structures and unions should be returned in memory.
464 This should only be defined if compatibility with another compiler or
465 with an ABI is needed, because it results in slower code. */
467 #ifndef DEFAULT_PCC_STRUCT_RETURN
468 #define DEFAULT_PCC_STRUCT_RETURN 1
471 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
473 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
475 /* Nonzero for -fforce-mem: load memory value into a register
476 before arithmetic on it. This makes better cse but slower compilation. */
478 int flag_force_mem = 0;
480 /* Nonzero for -fforce-addr: load memory address into a register before
481 reference to memory. This makes better cse but slower compilation. */
483 int flag_force_addr = 0;
485 /* Nonzero for -fdefer-pop: don't pop args after each function call;
486 instead save them up to pop many calls' args with one insns. */
488 int flag_defer_pop = 0;
490 /* Nonzero for -ffloat-store: don't allocate floats and doubles
491 in extended-precision registers. */
493 int flag_float_store = 0;
495 /* Nonzero for -fcse-follow-jumps:
496 have cse follow jumps to do a more extensive job. */
498 int flag_cse_follow_jumps;
500 /* Nonzero for -fcse-skip-blocks:
501 have cse follow a branch around a block. */
502 int flag_cse_skip_blocks;
504 /* Nonzero for -fexpensive-optimizations:
505 perform miscellaneous relatively-expensive optimizations. */
506 int flag_expensive_optimizations;
508 /* Nonzero for -fthread-jumps:
509 have jump optimize output of loop. */
511 int flag_thread_jumps;
513 /* Nonzero enables strength-reduction in loop.c. */
515 int flag_strength_reduce = 0;
517 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
518 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
519 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
522 int flag_old_unroll_loops;
524 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
525 This is generally not a win. */
527 int flag_old_unroll_all_loops;
529 /* Enables unrolling of simple loops in loop-unroll.c. */
530 int flag_unroll_loops;
532 /* Enables unrolling of all loops in loop-unroll.c. */
533 int flag_unroll_all_loops;
535 /* Nonzero enables loop peeling. */
538 /* Nonzero enables loop unswitching. */
539 int flag_unswitch_loops;
541 /* Nonzero enables prefetch optimizations for arrays in loops. */
543 int flag_prefetch_loop_arrays;
545 /* Nonzero forces all invariant computations in loops to be moved
548 int flag_move_all_movables = 0;
550 /* Nonzero forces all general induction variables in loops to be
553 int flag_reduce_all_givs = 0;
555 /* Nonzero to perform full register move optimization passes. This is the
558 int flag_regmove = 0;
560 /* Nonzero for -fwritable-strings:
561 store string constants in data segment and don't uniquize them. */
563 int flag_writable_strings = 0;
565 /* Nonzero means don't put addresses of constant functions in registers.
566 Used for compiling the Unix kernel, where strange substitutions are
567 done on the assembly output. */
569 int flag_no_function_cse = 0;
571 /* Nonzero for -fomit-frame-pointer:
572 don't make a frame pointer in simple functions that don't require one. */
574 int flag_omit_frame_pointer = 0;
576 /* Nonzero means place each function into its own section on those platforms
577 which support arbitrary section names and unlimited numbers of sections. */
579 int flag_function_sections = 0;
581 /* ... and similar for data. */
583 int flag_data_sections = 0;
585 /* Nonzero to inhibit use of define_optimization peephole opts. */
587 int flag_no_peephole = 0;
589 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
591 int flag_optimize_sibling_calls = 0;
593 /* Nonzero means the front end generally wants `errno' maintained by math
594 operations, like built-in SQRT. */
596 int flag_errno_math = 1;
598 /* Nonzero means that unsafe floating-point math optimizations are allowed
599 for the sake of speed. IEEE compliance is not guaranteed, and operations
600 are allowed to assume that their arguments and results are "normal"
601 (e.g., nonnegative for SQRT). */
603 int flag_unsafe_math_optimizations = 0;
605 /* Nonzero means that no NaNs or +-Infs are expected. */
607 int flag_finite_math_only = 0;
609 /* Zero means that floating-point math operations cannot generate a
610 (user-visible) trap. This is the case, for example, in nonstop
611 IEEE 754 arithmetic. Trapping conditions include division by zero,
612 overflow, underflow, invalid and inexact, but does not include
613 operations on signaling NaNs (see below). */
615 int flag_trapping_math = 1;
617 /* Nonzero means disable transformations observable by signaling NaNs.
618 This option implies that any operation on a IEEE signaling NaN can
619 generate a (user-visible) trap. */
621 int flag_signaling_nans = 0;
623 /* 0 means straightforward implementation of complex divide acceptable.
624 1 means wide ranges of inputs must work for complex divide.
625 2 means C99-like requirements for complex divide (not yet implemented). */
627 int flag_complex_divide_method = 0;
629 /* Nonzero means just do syntax checking; don't output anything. */
631 int flag_syntax_only = 0;
633 /* Nonzero means perform loop optimizer. */
635 static int flag_loop_optimize;
637 /* Nonzero means perform crossjumping. */
639 static int flag_crossjumping;
641 /* Nonzero means perform if conversion. */
643 static int flag_if_conversion;
645 /* Nonzero means perform if conversion after reload. */
647 static int flag_if_conversion2;
649 /* Nonzero means to use global dataflow analysis to eliminate
650 useless null pointer tests. */
652 static int flag_delete_null_pointer_checks;
654 /* Nonzero means perform global CSE. */
658 /* Nonzero means to do the enhanced load motion during gcse, which trys
659 to hoist loads by not killing them when a store to the same location
662 int flag_gcse_lm = 1;
664 /* Nonzero means to perform store motion after gcse, which will try to
665 move stores closer to the exit block. Its not very effective without
668 int flag_gcse_sm = 1;
670 /* Nonzero means to rerun cse after loop optimization. This increases
671 compilation time about 20% and picks up a few more common expressions. */
673 static int flag_rerun_cse_after_loop;
675 /* Nonzero means to run loop optimizations twice. */
677 int flag_rerun_loop_opt;
679 /* Nonzero for -finline-functions: ok to inline functions that look like
680 good inline candidates. */
682 int flag_inline_functions;
684 /* Nonzero for -fkeep-inline-functions: even if we make a function
685 go inline everywhere, keep its definition around for debugging
688 int flag_keep_inline_functions;
690 /* Nonzero means that functions will not be inlined. */
692 int flag_no_inline = 2;
694 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
695 not just because the tree inliner turned us off. */
697 int flag_really_no_inline = 2;
699 /* Nonzero means that we should emit static const variables
700 regardless of whether or not optimization is turned on. */
702 int flag_keep_static_consts = 1;
704 /* Nonzero means we should be saving declaration info into a .X file. */
706 int flag_gen_aux_info = 0;
708 /* Specified name of aux-info file. */
710 static char *aux_info_file_name;
712 /* Nonzero means make the text shared if supported. */
714 int flag_shared_data;
716 /* Nonzero means schedule into delayed branch slots if supported. */
718 int flag_delayed_branch;
720 /* Nonzero if we are compiling pure (sharable) code.
721 Value is 1 if we are doing "small" pic; value is 2 if we're doing
726 /* Set to the default thread-local storage (tls) model to use. */
728 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
730 /* Nonzero means generate extra code for exception handling and enable
731 exception handling. */
735 /* Nonzero means generate frame unwind info table when supported. */
737 int flag_unwind_tables = 0;
739 /* Nonzero means generate frame unwind info table exact at each insn boundary */
741 int flag_asynchronous_unwind_tables = 0;
743 /* Nonzero means don't place uninitialized global data in common storage
748 /* Nonzero means change certain warnings into errors.
749 Usually these are warnings about failure to conform to some standard. */
751 int flag_pedantic_errors = 0;
753 /* flag_schedule_insns means schedule insns within basic blocks (before
755 flag_schedule_insns_after_reload means schedule insns after
758 int flag_schedule_insns = 0;
759 int flag_schedule_insns_after_reload = 0;
761 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
762 int flag_sched2_use_superblocks = 0;
764 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
766 int flag_sched2_use_traces = 0;
768 /* The following flags have effect only for scheduling before register
771 flag_schedule_interblock means schedule insns across basic blocks.
772 flag_schedule_speculative means allow speculative motion of non-load insns.
773 flag_schedule_speculative_load means allow speculative motion of some
775 flag_schedule_speculative_load_dangerous allows speculative motion of more
778 int flag_schedule_interblock = 1;
779 int flag_schedule_speculative = 1;
780 int flag_schedule_speculative_load = 0;
781 int flag_schedule_speculative_load_dangerous = 0;
783 int flag_single_precision_constant;
785 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
786 by a cheaper branch on a count register. */
787 int flag_branch_on_count_reg = 1;
789 /* -finhibit-size-directive inhibits output of .size for ELF.
790 This is used only for compiling crtstuff.c,
791 and it may be extended to other effects
792 needed for crtstuff.c on other systems. */
793 int flag_inhibit_size_directive = 0;
795 /* -fverbose-asm causes extra commentary information to be produced in
796 the generated assembly code (to make it more readable). This option
797 is generally only of use to those who actually need to read the
798 generated assembly code (perhaps while debugging the compiler itself).
799 -fno-verbose-asm, the default, causes the extra information
800 to be omitted and is useful when comparing two assembler files. */
802 int flag_verbose_asm = 0;
804 /* -dA causes debug commentary information to be produced in
805 the generated assembly code (to make it more readable). This option
806 is generally only of use to those who actually need to read the
807 generated assembly code (perhaps while debugging the compiler itself).
808 Currently, this switch is only used by dwarfout.c; however, it is intended
809 to be a catchall for printing debug information in the assembler file. */
811 int flag_debug_asm = 0;
813 /* -dP causes the rtl to be emitted as a comment in assembly. */
815 int flag_dump_rtl_in_asm = 0;
817 /* -fgnu-linker specifies use of the GNU linker for initializations.
818 (Or, more generally, a linker that handles initializations.)
819 -fno-gnu-linker says that collect2 will be used. */
821 int flag_gnu_linker = 0;
823 int flag_gnu_linker = 1;
826 /* Nonzero means put zero initialized data in the bss section. */
827 int flag_zero_initialized_in_bss = 1;
832 /* Enable ssa conditional constant propagation. */
833 int flag_ssa_ccp = 0;
835 /* Enable ssa aggressive dead code elimination. */
836 int flag_ssa_dce = 0;
838 /* Tag all structures with __attribute__(packed). */
839 int flag_pack_struct = 0;
841 /* Emit code to check for stack overflow; also may cause large objects
842 to be allocated dynamically. */
843 int flag_stack_check;
845 /* When non-NULL, indicates that whenever space is allocated on the
846 stack, the resulting stack pointer must not pass this
847 address---that is, for stacks that grow downward, the stack pointer
848 must always be greater than or equal to this address; for stacks
849 that grow upward, the stack pointer must be less than this address.
850 At present, the rtx may be either a REG or a SYMBOL_REF, although
851 the support provided depends on the backend. */
854 /* 0 if pointer arguments may alias each other. True in C.
855 1 if pointer arguments may not alias each other but may alias
857 2 if pointer arguments may not alias each other and may not
858 alias global variables. True in Fortran.
859 This defaults to 0 for C. */
860 int flag_argument_noalias = 0;
862 /* Nonzero if we should do (language-dependent) alias analysis.
863 Typically, this analysis will assume that expressions of certain
864 types do not alias expressions of certain other types. Only used
865 if alias analysis (in general) is enabled. */
866 int flag_strict_aliasing = 0;
868 /* Instrument functions with calls at entry and exit, for profiling. */
869 int flag_instrument_function_entry_exit = 0;
871 /* Nonzero means ignore `#ident' directives. 0 means handle them.
872 On SVR4 targets, it also controls whether or not to emit a
873 string identifying the compiler. */
875 int flag_no_ident = 0;
877 /* This will perform a peephole pass before sched2. */
878 int flag_peephole2 = 0;
880 /* This will try to guess branch probabilities. */
881 int flag_guess_branch_prob = 0;
883 /* -fcheck-bounds causes gcc to generate array bounds checks.
884 For C, C++, ObjC: defaults to off.
885 For Java: defaults to on.
886 For Fortran: defaults to off. */
887 int flag_bounds_check = 0;
889 /* This will attempt to merge constant section constants, if 1 only
890 string constants and constants from constant pool, if 2 also constant
892 int flag_merge_constants = 1;
894 /* If one, renumber instruction UIDs to reduce the number of
895 unused UIDs if there are a lot of instructions. If greater than
896 one, unconditionally renumber instruction UIDs. */
897 int flag_renumber_insns = 1;
899 /* If nonzero, use the graph coloring register allocator. */
900 int flag_new_regalloc = 0;
902 /* Nonzero if we perform superblock formation. */
906 /* Nonzero if we perform whole unit at a time compilation. */
908 int flag_unit_at_a_time = 0;
910 /* Values of the -falign-* flags: how much to align labels in code.
911 0 means `use default', 1 means `don't align'.
912 For each variable, there is an _log variant which is the power
913 of two not less than the variable, for .align output. */
917 int align_loops_max_skip;
920 int align_jumps_max_skip;
922 int align_labels_log;
923 int align_labels_max_skip;
925 int align_functions_log;
927 /* Like align_functions_log above, but used by front-ends to force the
928 minimum function alignment. Zero means no alignment is forced. */
929 int force_align_functions_log;
931 /* Table of supported debugging formats. */
934 const char *const arg;
935 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
936 constant expression, we use NO_DEBUG in its place. */
937 const enum debug_info_type debug_type;
938 const int use_extensions_p;
939 const char *const description;
943 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
944 N_("Generate debugging info in default format") },
945 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
946 #ifdef DBX_DEBUGGING_INFO
947 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
948 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
950 #ifdef DWARF_DEBUGGING_INFO
951 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
952 { "dwarf+", DWARF_DEBUG, 1,
953 N_("Generate extended DWARF-1 format debug info") },
955 #ifdef DWARF2_DEBUGGING_INFO
956 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
958 #ifdef XCOFF_DEBUGGING_INFO
959 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
960 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
962 #ifdef SDB_DEBUGGING_INFO
963 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
965 #ifdef VMS_DEBUGGING_INFO
966 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
973 const char *const string;
976 const char *const description;
978 lang_independent_options;
982 /* Add or remove a leading underscore from user symbols. */
983 int flag_leading_underscore = -1;
985 /* The user symbol prefix after having resolved same. */
986 const char *user_label_prefix;
988 static const param_info lang_independent_params[] = {
989 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
990 { OPTION, DEFAULT, HELP },
991 #include "params.def"
996 /* Table of language-independent -f options.
997 STRING is the option name. VARIABLE is the address of the variable.
998 ON_VALUE is the value to store in VARIABLE
999 if `-fSTRING' is seen as an option.
1000 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1002 static const lang_independent_options f_options[] =
1004 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
1005 N_("Perform DWARF2 duplicate elimination") },
1006 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1,
1007 N_("Perform unused type elimination in debug info") },
1008 {"float-store", &flag_float_store, 1,
1009 N_("Do not store floats in registers") },
1010 {"defer-pop", &flag_defer_pop, 1,
1011 N_("Defer popping functions args from stack until later") },
1012 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1013 N_("When possible do not generate stack frames") },
1014 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1015 N_("Optimize sibling and tail recursive calls") },
1016 {"tracer", &flag_tracer, 1,
1017 N_("Perform superblock formation via tail duplication") },
1018 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1019 N_("Compile whole compilation unit at a time") },
1020 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1021 N_("When running CSE, follow jumps to their targets") },
1022 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1023 N_("When running CSE, follow conditional jumps") },
1024 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1025 N_("Perform a number of minor, expensive optimizations") },
1026 {"thread-jumps", &flag_thread_jumps, 1,
1027 N_("Perform jump threading optimizations") },
1028 {"strength-reduce", &flag_strength_reduce, 1,
1029 N_("Perform strength reduction optimizations") },
1030 {"unroll-loops", &flag_unroll_loops, 1,
1031 N_("Perform loop unrolling when iteration count is known") },
1032 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1033 N_("Perform loop unrolling for all loops") },
1034 {"old-unroll-loops", &flag_old_unroll_loops, 1,
1035 N_("Perform loop unrolling when iteration count is known") },
1036 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1,
1037 N_("Perform loop unrolling for all loops") },
1038 {"peel-loops", &flag_peel_loops, 1,
1039 N_("Perform loop peeling") },
1040 {"unswitch-loops", &flag_unswitch_loops, 1,
1041 N_("Perform loop unswitching") },
1042 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1043 N_("Generate prefetch instructions, if available, for arrays in loops") },
1044 {"move-all-movables", &flag_move_all_movables, 1,
1045 N_("Force all loop invariant computations out of loops") },
1046 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1047 N_("Strength reduce all loop general induction variables") },
1048 {"writable-strings", &flag_writable_strings, 1,
1049 N_("Store strings in writable data section") },
1050 {"peephole", &flag_no_peephole, 0,
1051 N_("Enable machine specific peephole optimizations") },
1052 {"force-mem", &flag_force_mem, 1,
1053 N_("Copy memory operands into registers before using") },
1054 {"force-addr", &flag_force_addr, 1,
1055 N_("Copy memory address constants into regs before using") },
1056 {"function-cse", &flag_no_function_cse, 0,
1057 N_("Allow function addresses to be held in registers") },
1058 {"inline-functions", &flag_inline_functions, 1,
1059 N_("Integrate simple functions into their callers") },
1060 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1061 N_("Generate code for funcs even if they are fully inlined") },
1062 {"inline", &flag_no_inline, 0,
1063 N_("Pay attention to the 'inline' keyword") },
1064 {"keep-static-consts", &flag_keep_static_consts, 1,
1065 N_("Emit static const variables even if they are not used") },
1066 {"syntax-only", &flag_syntax_only, 1,
1067 N_("Check for syntax errors, then stop") },
1068 {"shared-data", &flag_shared_data, 1,
1069 N_("Mark data as shared rather than private") },
1070 {"caller-saves", &flag_caller_saves, 1,
1071 N_("Enable saving registers around function calls") },
1072 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1073 N_("Return 'short' aggregates in memory, not registers") },
1074 {"reg-struct-return", &flag_pcc_struct_return, 0,
1075 N_("Return 'short' aggregates in registers") },
1076 {"delayed-branch", &flag_delayed_branch, 1,
1077 N_("Attempt to fill delay slots of branch instructions") },
1078 {"gcse", &flag_gcse, 1,
1079 N_("Perform the global common subexpression elimination") },
1080 {"gcse-lm", &flag_gcse_lm, 1,
1081 N_("Perform enhanced load motion during global subexpression elimination") },
1082 {"gcse-sm", &flag_gcse_sm, 1,
1083 N_("Perform store motion after global subexpression elimination") },
1084 {"loop-optimize", &flag_loop_optimize, 1,
1085 N_("Perform the loop optimizations") },
1086 {"crossjumping", &flag_crossjumping, 1,
1087 N_("Perform cross-jumping optimization") },
1088 {"if-conversion", &flag_if_conversion, 1,
1089 N_("Perform conversion of conditional jumps to branchless equivalents") },
1090 {"if-conversion2", &flag_if_conversion2, 1,
1091 N_("Perform conversion of conditional jumps to conditional execution") },
1092 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1093 N_("Run CSE pass after loop optimizations") },
1094 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1095 N_("Run the loop optimizer twice") },
1096 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1097 N_("Delete useless null pointer checks") },
1098 {"schedule-insns", &flag_schedule_insns, 1,
1099 N_("Reschedule instructions before register allocation") },
1100 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1101 N_("Reschedule instructions after register allocation") },
1102 {"sched-interblock",&flag_schedule_interblock, 1,
1103 N_("Enable scheduling across basic blocks") },
1104 {"sched-spec",&flag_schedule_speculative, 1,
1105 N_("Allow speculative motion of non-loads") },
1106 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1107 N_("Allow speculative motion of some loads") },
1108 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1109 N_("Allow speculative motion of more loads") },
1110 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1111 N_("If scheduling post reload, do superblock sheduling") },
1112 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1113 N_("If scheduling post reload, do trace sheduling") },
1114 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1115 N_("Replace add,compare,branch with branch on count reg") },
1116 {"pic", &flag_pic, 1,
1117 N_("Generate position independent code, if possible") },
1118 {"PIC", &flag_pic, 2, ""},
1119 {"exceptions", &flag_exceptions, 1,
1120 N_("Enable exception handling") },
1121 {"unwind-tables", &flag_unwind_tables, 1,
1122 N_("Just generate unwind tables for exception handling") },
1123 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1124 N_("Generate unwind tables exact at each instruction boundary") },
1125 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1126 N_("Support synchronous non-call exceptions") },
1127 {"profile-arcs", &profile_arc_flag, 1,
1128 N_("Insert arc based program profiling code") },
1129 {"test-coverage", &flag_test_coverage, 1,
1130 N_("Create data files needed by gcov") },
1131 {"branch-probabilities", &flag_branch_probabilities, 1,
1132 N_("Use profiling information for branch probabilities") },
1133 {"profile", &profile_flag, 1,
1134 N_("Enable basic program profiling code") },
1135 {"reorder-blocks", &flag_reorder_blocks, 1,
1136 N_("Reorder basic blocks to improve code placement") },
1137 {"reorder-functions", &flag_reorder_functions, 1,
1138 N_("Reorder functions to improve code placement") },
1139 {"rename-registers", &flag_rename_registers, 1,
1140 N_("Do the register renaming optimization pass") },
1141 {"cprop-registers", &flag_cprop_registers, 1,
1142 N_("Do the register copy-propagation optimization pass") },
1143 {"common", &flag_no_common, 0,
1144 N_("Do not put uninitialized globals in the common section") },
1145 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1146 N_("Do not generate .size directives") },
1147 {"function-sections", &flag_function_sections, 1,
1148 N_("place each function into its own section") },
1149 {"data-sections", &flag_data_sections, 1,
1150 N_("place data items into their own section") },
1151 {"verbose-asm", &flag_verbose_asm, 1,
1152 N_("Add extra commentry to assembler output") },
1153 {"gnu-linker", &flag_gnu_linker, 1,
1154 N_("Output GNU ld formatted global initializers") },
1155 {"regmove", &flag_regmove, 1,
1156 N_("Enables a register move optimization") },
1157 {"optimize-register-move", &flag_regmove, 1,
1158 N_("Do the full regmove optimization pass") },
1159 {"pack-struct", &flag_pack_struct, 1,
1160 N_("Pack structure members together without holes") },
1161 {"stack-check", &flag_stack_check, 1,
1162 N_("Insert stack checking code into the program") },
1163 {"argument-alias", &flag_argument_noalias, 0,
1164 N_("Specify that arguments may alias each other & globals") },
1165 {"argument-noalias", &flag_argument_noalias, 1,
1166 N_("Assume arguments may alias globals but not each other") },
1167 {"argument-noalias-global", &flag_argument_noalias, 2,
1168 N_("Assume arguments do not alias each other or globals") },
1169 {"strict-aliasing", &flag_strict_aliasing, 1,
1170 N_("Assume strict aliasing rules apply") },
1171 {"align-loops", &align_loops, 0,
1172 N_("Align the start of loops") },
1173 {"align-jumps", &align_jumps, 0,
1174 N_("Align labels which are only reached by jumping") },
1175 {"align-labels", &align_labels, 0,
1176 N_("Align all labels") },
1177 {"align-functions", &align_functions, 0,
1178 N_("Align the start of functions") },
1179 {"merge-constants", &flag_merge_constants, 1,
1180 N_("Attempt to merge identical constants accross compilation units") },
1181 {"merge-all-constants", &flag_merge_constants, 2,
1182 N_("Attempt to merge identical constants and constant variables") },
1183 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1184 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1185 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1186 N_("Instrument function entry/exit with profiling calls") },
1187 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1188 N_("Put zero initialized data in the bss section") },
1189 {"ssa", &flag_ssa, 1,
1190 N_("Enable SSA optimizations") },
1191 {"ssa-ccp", &flag_ssa_ccp, 1,
1192 N_("Enable SSA conditional constant propagation") },
1193 {"ssa-dce", &flag_ssa_dce, 1,
1194 N_("Enable aggressive SSA dead code elimination") },
1195 {"leading-underscore", &flag_leading_underscore, 1,
1196 N_("External symbols have a leading underscore") },
1197 {"ident", &flag_no_ident, 0,
1198 N_("Process #ident directives") },
1199 { "peephole2", &flag_peephole2, 1,
1200 N_("Enables an rtl peephole pass run before sched2") },
1201 {"finite-math-only", &flag_finite_math_only, 1,
1202 N_("Assume no NaNs or +-Infs are generated") },
1203 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1204 N_("Enables guessing of branch probabilities") },
1205 {"math-errno", &flag_errno_math, 1,
1206 N_("Set errno after built-in math functions") },
1207 {"trapping-math", &flag_trapping_math, 1,
1208 N_("Floating-point operations can trap") },
1209 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1210 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1211 {"signaling-nans", &flag_signaling_nans, 1,
1212 N_("Disable optimizations observable by IEEE signaling NaNs") },
1213 {"bounds-check", &flag_bounds_check, 1,
1214 N_("Generate code to check bounds before indexing arrays") },
1215 {"single-precision-constant", &flag_single_precision_constant, 1,
1216 N_("Convert floating point constant to single precision constant") },
1217 {"time-report", &time_report, 1,
1218 N_("Report time taken by each compiler pass at end of run") },
1219 {"mem-report", &mem_report, 1,
1220 N_("Report on permanent memory allocation at end of run") },
1221 { "trapv", &flag_trapv, 1,
1222 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1223 { "new-ra", &flag_new_regalloc, 1,
1224 N_("Use graph coloring register allocation.") },
1227 /* Table of language-specific options. */
1229 static const struct lang_opt
1231 const char *const option;
1232 const char *const description;
1234 documented_lang_options[] =
1236 /* In order not to overload the --help output, the convention
1237 used here is to only describe those options which are not
1238 enabled by default. */
1241 N_("Compile just for ISO C90") },
1243 N_("Determine language standard") },
1245 { "-fsigned-bitfields", "" },
1246 { "-funsigned-bitfields",
1247 N_("Make bit-fields by unsigned by default") },
1248 { "-fno-signed-bitfields", "" },
1249 { "-fno-unsigned-bitfields","" },
1251 N_("Make 'char' be signed by default") },
1252 { "-funsigned-char",
1253 N_("Make 'char' be unsigned by default") },
1254 { "-fno-signed-char", "" },
1255 { "-fno-unsigned-char", "" },
1259 N_("Do not recognize the 'asm' keyword") },
1260 { "-fbuiltin", "" },
1262 N_("Do not recognize any built in functions") },
1264 N_("Assume normal C execution environment") },
1265 { "-fno-hosted", "" },
1267 N_("Assume that standard libraries & main might not exist") },
1268 { "-fno-freestanding", "" },
1269 { "-fcond-mismatch",
1270 N_("Allow different types as args of ? operator") },
1271 { "-fno-cond-mismatch", "" },
1272 { "-fdollars-in-identifiers",
1273 N_("Allow the use of $ inside identifiers") },
1274 { "-fno-dollars-in-identifiers", "" },
1275 { "-fpreprocessed", "" },
1276 { "-fno-preprocessed", "" },
1278 N_("Use the same size for double as for float") },
1279 { "-fno-short-double", "" },
1281 N_("Use the smallest fitting integer to hold enums") },
1282 { "-fno-short-enums", "" },
1284 N_("Override the underlying type for wchar_t to `unsigned short'") },
1285 { "-fno-short-wchar", "" },
1288 N_("Enable most warning messages") },
1289 { "-Wbad-function-cast",
1290 N_("Warn about casting functions to incompatible types") },
1291 { "-Wno-bad-function-cast", "" },
1292 { "-Wmissing-format-attribute",
1293 N_("Warn about functions which might be candidates for format attributes") },
1294 { "-Wno-missing-format-attribute", "" },
1296 N_("Warn about casts which discard qualifiers") },
1297 { "-Wno-cast-qual", "" },
1298 { "-Wchar-subscripts",
1299 N_("Warn about subscripts whose type is 'char'") },
1300 { "-Wno-char-subscripts", "" },
1302 N_("Warn if nested comments are detected") },
1303 { "-Wno-comment", "" },
1305 N_("Warn if nested comments are detected") },
1306 { "-Wno-comments", "" },
1308 N_("Warn about possibly confusing type conversions") },
1309 { "-Wno-conversion", "" },
1310 { "-Wdiv-by-zero", "" },
1311 { "-Wno-div-by-zero",
1312 N_("Do not warn about compile-time integer division by zero") },
1314 N_("Warn about testing equality of floating point numbers") },
1315 { "-Wno-float-equal", "" },
1317 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1318 { "-Wno-format", "" },
1319 { "-Wformat-extra-args", "" },
1320 { "-Wno-format-extra-args",
1321 N_("Don't warn about too many arguments to format functions") },
1322 { "-Wformat-nonliteral",
1323 N_("Warn about non-string-literal format strings") },
1324 { "-Wno-format-nonliteral", "" },
1325 { "-Wformat-security",
1326 N_("Warn about possible security problems with format functions") },
1327 { "-Wno-format-security", "" },
1328 { "-Wformat-y2k", "" },
1329 { "-Wno-format-y2k",
1330 N_("Don't warn about strftime formats yielding 2 digit years") },
1331 { "-Wimplicit-function-declaration",
1332 N_("Warn about implicit function declarations") },
1333 { "-Wno-implicit-function-declaration", "" },
1334 { "-Werror-implicit-function-declaration", "" },
1336 N_("Warn when a declaration does not specify a type") },
1337 { "-Wno-implicit-int", "" },
1338 { "-Wimplicit", "" },
1339 { "-Wno-implicit", "" },
1341 N_("Warn about the use of the #import directive") },
1342 { "-Wno-import", "" },
1344 N_("Warn about PCH files that are found but not used") },
1345 { "-Wlong-long","" },
1347 N_("Do not warn about using 'long long' when -pedantic") },
1349 N_("Warn about suspicious declarations of main") },
1350 { "-Wno-main", "" },
1351 { "-Wmissing-braces",
1352 N_("Warn about possibly missing braces around initializers") },
1353 { "-Wno-missing-braces", "" },
1354 { "-Wmissing-declarations",
1355 N_("Warn about global funcs without previous declarations") },
1356 { "-Wno-missing-declarations", "" },
1357 { "-Wmissing-prototypes",
1358 N_("Warn about global funcs without prototypes") },
1359 { "-Wno-missing-prototypes", "" },
1361 N_("Warn about use of multicharacter literals") },
1362 { "-Wno-multichar", "" },
1363 { "-Wnested-externs",
1364 N_("Warn about externs not at file scope level") },
1365 { "-Wno-nested-externs", "" },
1367 N_("Warn about possible missing parentheses") },
1368 { "-Wno-parentheses", "" },
1369 { "-Wpointer-arith",
1370 N_("Warn about function pointer arithmetic") },
1371 { "-Wno-pointer-arith", "" },
1372 { "-Wredundant-decls",
1373 N_("Warn about multiple declarations of the same object") },
1374 { "-Wno-redundant-decls", "" },
1376 N_("Warn whenever a function's return-type defaults to int") },
1377 { "-Wno-return-type", "" },
1378 { "-Wsequence-point",
1379 N_("Warn about possible violations of sequence point rules") },
1380 { "-Wno-sequence-point", "" },
1382 N_("Warn about signed/unsigned comparisons") },
1383 { "-Wno-sign-compare", "" },
1384 { "-Wstrict-prototypes",
1385 N_("Warn about non-prototyped function decls") },
1386 { "-Wno-strict-prototypes", "" },
1388 N_("Warn about constructs whose meanings change in ISO C") },
1389 { "-Wno-traditional", "" },
1391 N_("Warn when trigraphs are encountered") },
1392 { "-Wno-trigraphs", "" },
1394 { "-Wno-undef", "" },
1395 { "-Wunknown-pragmas",
1396 N_("Warn about unrecognized pragmas") },
1397 { "-Wno-unknown-pragmas", "" },
1398 { "-Wwrite-strings",
1399 N_("Mark strings as 'const char *'") },
1400 { "-Wno-write-strings", "" },
1402 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1404 #include "options.h"
1408 /* Here is a table, controlled by the tm.h file, listing each -m switch
1409 and which bits in `target_switches' it should set or clear.
1410 If VALUE is positive, it is bits to set.
1411 If VALUE is negative, -VALUE is bits to clear.
1412 (The sign bit is not used so there is no confusion.) */
1416 const char *const name;
1418 const char *const description;
1420 target_switches[] = TARGET_SWITCHES;
1422 /* This table is similar, but allows the switch to have a value. */
1424 #ifdef TARGET_OPTIONS
1427 const char *const prefix;
1428 const char **const variable;
1429 const char *const description;
1431 target_options[] = TARGET_OPTIONS;
1434 /* Options controlling warnings. */
1436 /* Don't print warning messages. -w. */
1438 int inhibit_warnings = 0;
1440 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1442 int warn_system_headers = 0;
1444 /* Print various extra warnings. -W/-Wextra. */
1446 int extra_warnings = 0;
1448 /* Treat warnings as errors. -Werror. */
1450 int warnings_are_errors = 0;
1452 /* Nonzero to warn about unused variables, functions et.al. */
1454 int warn_unused_function;
1455 int warn_unused_label;
1456 int warn_unused_parameter;
1457 int warn_unused_variable;
1458 int warn_unused_value;
1460 /* Nonzero to warn about code which is never reached. */
1462 int warn_notreached;
1464 /* Nonzero to warn about variables used before they are initialized. */
1466 int warn_uninitialized;
1468 /* Nonzero means warn about all declarations which shadow others. */
1472 /* Warn if a switch on an enum, that does not have a default case,
1473 fails to have a case for every enum value. */
1477 /* Warn if a switch does not have a default case. */
1479 int warn_switch_default;
1481 /* Warn if a switch on an enum fails to have a case for every enum
1482 value (regardless of the presence or otherwise of a default case). */
1484 int warn_switch_enum;
1486 /* Nonzero means warn about function definitions that default the return type
1487 or that use a null return and have a return-type other than void. */
1489 int warn_return_type;
1491 /* Nonzero means warn about pointer casts that increase the required
1492 alignment of the target type (and might therefore lead to a crash
1493 due to a misaligned access). */
1495 int warn_cast_align;
1497 /* Nonzero means warn about any objects definitions whose size is larger
1498 than N bytes. Also want about function definitions whose returned
1499 values are larger than N bytes. The value N is in `larger_than_size'. */
1501 int warn_larger_than;
1502 HOST_WIDE_INT larger_than_size;
1504 /* Nonzero means warn if inline function is too large. */
1508 /* Warn if a function returns an aggregate,
1509 since there are often incompatible calling conventions for doing this. */
1511 int warn_aggregate_return;
1513 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1517 /* Warn when gcc pads a structure to an alignment boundary. */
1521 /* Warn when an optimization pass is disabled. */
1523 int warn_disabled_optimization;
1525 /* Warn about functions which might be candidates for attribute noreturn. */
1527 int warn_missing_noreturn;
1529 /* Nonzero means warn about uses of __attribute__((deprecated))
1532 int warn_deprecated_decl = 1;
1534 /* Nonzero means warn about constructs which might not be
1535 strict-aliasing safe. */
1537 int warn_strict_aliasing;
1539 /* Like f_options, but for -W. */
1541 static const lang_independent_options W_options[] =
1543 {"unused-function", &warn_unused_function, 1,
1544 N_("Warn when a function is unused") },
1545 {"unused-label", &warn_unused_label, 1,
1546 N_("Warn when a label is unused") },
1547 {"unused-parameter", &warn_unused_parameter, 1,
1548 N_("Warn when a function parameter is unused") },
1549 {"unused-variable", &warn_unused_variable, 1,
1550 N_("Warn when a variable is unused") },
1551 {"unused-value", &warn_unused_value, 1,
1552 N_("Warn when an expression value is unused") },
1553 {"system-headers", &warn_system_headers, 1,
1554 N_("Do not suppress warnings from system headers") },
1555 {"error", &warnings_are_errors, 1,
1556 N_("Treat all warnings as errors") },
1557 {"shadow", &warn_shadow, 1,
1558 N_("Warn when one local variable shadows another") },
1559 {"switch", &warn_switch, 1,
1560 N_("Warn about enumerated switches, with no default, missing a case") },
1561 {"switch-default", &warn_switch_default, 1,
1562 N_("Warn about enumerated switches missing a default case") },
1563 {"switch-enum", &warn_switch_enum, 1,
1564 N_("Warn about all enumerated switches missing a specific case") },
1565 {"aggregate-return", &warn_aggregate_return, 1,
1566 N_("Warn about returning structures, unions or arrays") },
1567 {"cast-align", &warn_cast_align, 1,
1568 N_("Warn about pointer casts which increase alignment") },
1569 {"unreachable-code", &warn_notreached, 1,
1570 N_("Warn about code that will never be executed") },
1571 {"uninitialized", &warn_uninitialized, 1,
1572 N_("Warn about uninitialized automatic variables") },
1573 {"inline", &warn_inline, 1,
1574 N_("Warn when an inlined function cannot be inlined") },
1575 {"packed", &warn_packed, 1,
1576 N_("Warn when the packed attribute has no effect on struct layout") },
1577 {"padded", &warn_padded, 1,
1578 N_("Warn when padding is required to align struct members") },
1579 {"disabled-optimization", &warn_disabled_optimization, 1,
1580 N_("Warn when an optimization pass is disabled") },
1581 {"deprecated-declarations", &warn_deprecated_decl, 1,
1582 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1583 {"extra", &extra_warnings, 1,
1584 N_("Print extra (possibly unwanted) warnings") },
1585 {"missing-noreturn", &warn_missing_noreturn, 1,
1586 N_("Warn about functions which might be candidates for attribute noreturn") },
1587 {"strict-aliasing", &warn_strict_aliasing, 1,
1588 N_ ("Warn about code which might break the strict aliasing rules") }
1592 set_Wunused (setting)
1595 warn_unused_function = setting;
1596 warn_unused_label = setting;
1597 /* Unused function parameter warnings are reported when either ``-W
1598 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1599 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1601 warn_unused_parameter = 0;
1602 else if (!warn_unused_parameter)
1603 warn_unused_parameter = -1;
1604 warn_unused_variable = setting;
1605 warn_unused_value = setting;
1608 /* The following routines are useful in setting all the flags that
1609 -ffast-math and -fno-fast-math imply. */
1612 set_fast_math_flags (set)
1615 flag_trapping_math = !set;
1616 flag_unsafe_math_optimizations = set;
1617 flag_finite_math_only = set;
1618 flag_errno_math = !set;
1620 flag_signaling_nans = 0;
1623 /* Return true iff flags are set as if -ffast-math. */
1625 fast_math_flags_set_p ()
1627 return (!flag_trapping_math
1628 && flag_unsafe_math_optimizations
1629 && flag_finite_math_only
1630 && !flag_errno_math);
1634 /* Output files for assembler code (real compiler output)
1635 and debugging dumps. */
1638 FILE *aux_info_file;
1639 FILE *rtl_dump_file = NULL;
1641 /* Decode the string P as an integral parameter.
1642 If the string is indeed an integer return its numeric value else
1643 issue an Invalid Option error for the option PNAME and return DEFVAL.
1644 If PNAME is zero just return DEFVAL, do not call error. */
1647 read_integral_parameter (p, pname, defval)
1652 const char *endp = p;
1656 if (ISDIGIT (*endp))
1665 error ("invalid option `%s'", pname);
1672 /* This calls abort and is used to avoid problems when abort is a macro.
1673 It is used when we need to pass the address of abort. */
1681 /* When `malloc.c' is compiled with `rcheck' defined,
1682 it calls this function to report clobberage. */
1686 const char *s ATTRIBUTE_UNUSED;
1691 /* Return the logarithm of X, base 2, considering X unsigned,
1692 if X is a power of 2. Otherwise, returns -1.
1694 This should be used via the `exact_log2' macro. */
1698 unsigned HOST_WIDE_INT x;
1701 /* Test for 0 or a power of 2. */
1702 if (x == 0 || x != (x & -x))
1704 while ((x >>= 1) != 0)
1709 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1710 If X is 0, return -1.
1712 This should be used via the floor_log2 macro. */
1716 unsigned HOST_WIDE_INT x;
1725 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1726 into ICE messages, which is much more user friendly. */
1729 crash_signal (signo)
1732 internal_error ("%s", strsignal (signo));
1735 /* Arrange to dump core on error. (The regular error message is still
1736 printed first, except in the case of abort().) */
1739 setup_core_dumping ()
1742 signal (SIGABRT, SIG_DFL);
1744 #if defined(HAVE_SETRLIMIT)
1747 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1748 fatal_io_error ("getting core file size maximum limit");
1749 rlim.rlim_cur = rlim.rlim_max;
1750 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1751 fatal_io_error ("setting core file size limit to maximum");
1754 diagnostic_abort_on_error (global_dc);
1758 /* Strip off a legitimate source ending from the input string NAME of
1759 length LEN. Rather than having to know the names used by all of
1760 our front ends, we strip off an ending of a period followed by
1761 up to five characters. (Java uses ".class".) */
1764 strip_off_ending (name, len)
1769 for (i = 2; i < 6 && len > i; i++)
1771 if (name[len - i] == '.')
1773 name[len - i] = '\0';
1779 /* Output a quoted string. */
1782 output_quoted_string (asm_file, string)
1786 #ifdef OUTPUT_QUOTED_STRING
1787 OUTPUT_QUOTED_STRING (asm_file, string);
1791 putc ('\"', asm_file);
1792 while ((c = *string++) != 0)
1796 if (c == '\"' || c == '\\')
1797 putc ('\\', asm_file);
1801 fprintf (asm_file, "\\%03o", (unsigned char) c);
1803 putc ('\"', asm_file);
1807 /* Output NAME into FILE after having turned it into something
1808 usable as an identifier in a target's assembly file. */
1810 output_clean_symbol_name (file, name)
1814 /* Make a copy of NAME. */
1815 char *id = xstrdup (name);
1817 /* Make it look like a valid identifier for an assembler. */
1818 clean_symbol_name (id);
1825 /* Output a file name in the form wanted by System V. */
1828 output_file_directive (asm_file, input_name)
1830 const char *input_name;
1832 int len = strlen (input_name);
1833 const char *na = input_name + len;
1835 /* NA gets INPUT_NAME sans directory names. */
1836 while (na > input_name)
1838 if (IS_DIR_SEPARATOR (na[-1]))
1843 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1844 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1846 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1847 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1849 fprintf (asm_file, "\t.file\t");
1850 output_quoted_string (asm_file, na);
1851 fputc ('\n', asm_file);
1856 /* Routine to open a dump file. Return true if the dump file is enabled. */
1859 open_dump_file (index, decl)
1860 enum dump_file_index index;
1864 const char *open_arg;
1867 if (! dump_file[index].enabled)
1870 timevar_push (TV_DUMP);
1871 if (rtl_dump_file != NULL)
1872 fclose (rtl_dump_file);
1874 sprintf (seq, DUMPFILE_FORMAT, index);
1876 if (! dump_file[index].initialized)
1878 /* If we've not initialized the files, do so now. */
1879 if (graph_dump_format != no_graph
1880 && dump_file[index].graph_dump_p)
1882 dump_name = concat (seq, dump_file[index].extension, NULL);
1883 clean_graph_dump_file (dump_base_name, dump_name);
1886 dump_file[index].initialized = 1;
1892 dump_name = concat (dump_base_name, seq,
1893 dump_file[index].extension, NULL);
1895 rtl_dump_file = fopen (dump_name, open_arg);
1896 if (rtl_dump_file == NULL)
1897 fatal_io_error ("can't open %s", dump_name);
1902 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1903 (*lang_hooks.decl_printable_name) (decl, 2),
1904 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1906 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1907 ? " (unlikely executed)"
1910 timevar_pop (TV_DUMP);
1914 /* Routine to close a dump file. */
1917 close_dump_file (index, func, insns)
1918 enum dump_file_index index;
1919 void (*func) PARAMS ((FILE *, rtx));
1922 if (! rtl_dump_file)
1925 timevar_push (TV_DUMP);
1927 && graph_dump_format != no_graph
1928 && dump_file[index].graph_dump_p)
1933 sprintf (seq, DUMPFILE_FORMAT, index);
1934 suffix = concat (seq, dump_file[index].extension, NULL);
1935 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1940 func (rtl_dump_file, insns);
1942 fflush (rtl_dump_file);
1943 fclose (rtl_dump_file);
1945 rtl_dump_file = NULL;
1946 timevar_pop (TV_DUMP);
1949 /* Do any final processing required for the declarations in VEC, of
1950 which there are LEN. We write out inline functions and variables
1951 that have been deferred until this point, but which are required.
1952 Returns nonzero if anything was put out. */
1955 wrapup_global_declarations (vec, len)
1962 int output_something = 0;
1964 for (i = 0; i < len; i++)
1968 /* We're not deferring this any longer. Assignment is
1969 conditional to avoid needlessly dirtying PCH pages. */
1970 if (DECL_DEFER_OUTPUT (decl) != 0)
1971 DECL_DEFER_OUTPUT (decl) = 0;
1973 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1974 (*lang_hooks.finish_incomplete_decl) (decl);
1977 /* Now emit any global variables or functions that we have been
1978 putting off. We need to loop in case one of the things emitted
1979 here references another one which comes earlier in the list. */
1983 for (i = 0; i < len; i++)
1987 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1990 /* Don't write out static consts, unless we still need them.
1992 We also keep static consts if not optimizing (for debugging),
1993 unless the user specified -fno-keep-static-consts.
1994 ??? They might be better written into the debug information.
1995 This is possible when using DWARF.
1997 A language processor that wants static constants to be always
1998 written out (even if it is not used) is responsible for
1999 calling rest_of_decl_compilation itself. E.g. the C front-end
2000 calls rest_of_decl_compilation from finish_decl.
2001 One motivation for this is that is conventional in some
2002 environments to write things like:
2003 static const char rcsid[] = "... version string ...";
2004 intending to force the string to be in the executable.
2006 A language processor that would prefer to have unneeded
2007 static constants "optimized away" would just defer writing
2008 them out until here. E.g. C++ does this, because static
2009 constants are often defined in header files.
2011 ??? A tempting alternative (for both C and C++) would be
2012 to force a constant to be written if and only if it is
2013 defined in a main file, as opposed to an include file. */
2015 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2019 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2021 else if (DECL_COMDAT (decl))
2023 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
2024 && (optimize || !flag_keep_static_consts
2025 || DECL_ARTIFICIAL (decl)))
2031 rest_of_decl_compilation (decl, NULL, 1, 1);
2035 if (TREE_CODE (decl) == FUNCTION_DECL
2036 && DECL_INITIAL (decl) != 0
2037 && DECL_SAVED_INSNS (decl) != 0
2038 && (flag_keep_inline_functions
2039 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2040 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2043 output_inline_function (decl);
2048 output_something = 1;
2052 return output_something;
2055 /* Issue appropriate warnings for the global declarations in VEC (of
2056 which there are LEN). Output debugging information for them. */
2059 check_global_declarations (vec, len)
2066 for (i = 0; i < len; i++)
2070 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2071 && ! TREE_ASM_WRITTEN (decl))
2072 /* Cancel the RTL for this decl so that, if debugging info
2073 output for global variables is still to come,
2074 this one will be omitted. */
2075 SET_DECL_RTL (decl, NULL_RTX);
2077 /* Warn about any function
2078 declared static but not defined.
2079 We don't warn about variables,
2080 because many programs have static variables
2081 that exist only to get some text into the object file. */
2082 if (TREE_CODE (decl) == FUNCTION_DECL
2083 && (warn_unused_function
2084 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2085 && DECL_INITIAL (decl) == 0
2086 && DECL_EXTERNAL (decl)
2087 && ! DECL_ARTIFICIAL (decl)
2088 && ! TREE_PUBLIC (decl))
2090 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2091 pedwarn_with_decl (decl,
2092 "`%s' used but never defined");
2094 warning_with_decl (decl,
2095 "`%s' declared `static' but never defined");
2096 /* This symbol is effectively an "extern" declaration now. */
2097 TREE_PUBLIC (decl) = 1;
2098 assemble_external (decl);
2101 /* Warn about static fns or vars defined but not used. */
2102 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2103 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2104 && ! TREE_USED (decl)
2105 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2106 to handle multiple external decls in different scopes. */
2107 && ! TREE_USED (DECL_NAME (decl))
2108 && ! DECL_EXTERNAL (decl)
2109 && ! TREE_PUBLIC (decl)
2110 /* Global register variables must be declared to reserve them. */
2111 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2112 /* Otherwise, ask the language. */
2113 && (*lang_hooks.decls.warn_unused_global) (decl))
2114 warning_with_decl (decl, "`%s' defined but not used");
2116 /* Avoid confusing the debug information machinery when there are
2118 if (errorcount == 0 && sorrycount == 0)
2120 timevar_push (TV_SYMOUT);
2121 (*debug_hooks->global_decl) (decl);
2122 timevar_pop (TV_SYMOUT);
2127 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2128 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2129 INPUT_FILENAME and LINENO accordingly. */
2132 push_srcloc (file, line)
2136 struct file_stack *fs;
2138 if (input_file_stack)
2140 input_file_stack->name = input_filename;
2141 input_file_stack->line = lineno;
2144 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2145 fs->name = input_filename = file;
2146 fs->line = lineno = line;
2147 fs->next = input_file_stack;
2148 input_file_stack = fs;
2149 input_file_stack_tick++;
2152 /* Pop the top entry off the stack of presently open source files.
2153 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2159 struct file_stack *fs;
2161 fs = input_file_stack;
2162 input_file_stack = fs->next;
2164 input_file_stack_tick++;
2165 /* The initial source file is never popped. */
2166 if (!input_file_stack)
2168 input_filename = input_file_stack->name;
2169 lineno = input_file_stack->line;
2172 /* Compile an entire translation unit. Write a file of assembly
2173 output and various debugging dumps. */
2178 /* Initialize yet another pass. */
2180 init_final (main_input_filename);
2181 init_branch_prob (aux_base_name);
2183 timevar_push (TV_PARSE);
2185 /* Call the parser, which parses the entire file (calling
2186 rest_of_compilation for each function). */
2187 (*lang_hooks.parse_file) (set_yydebug);
2189 /* In case there were missing block closers,
2190 get us back to the global binding level. */
2191 (*lang_hooks.clear_binding_stack) ();
2193 /* Compilation is now finished except for writing
2194 what's left of the symbol table output. */
2195 timevar_pop (TV_PARSE);
2197 if (flag_syntax_only)
2200 (*lang_hooks.decls.final_write_globals)();
2202 if (profile_arc_flag)
2203 /* This must occur after the loop to output deferred functions.
2204 Else the profiler initializer would not be emitted if all the
2205 functions in this compilation unit were deferred. */
2208 /* Write out any pending weak symbol declarations. */
2212 /* Do dbx symbols. */
2213 timevar_push (TV_SYMOUT);
2215 #ifdef DWARF2_UNWIND_INFO
2216 if (dwarf2out_do_frame ())
2217 dwarf2out_frame_finish ();
2220 (*debug_hooks->finish) (main_input_filename);
2221 timevar_pop (TV_SYMOUT);
2223 /* Output some stuff at end of file if nec. */
2225 dw2_output_indirect_constants ();
2227 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2229 timevar_push (TV_DUMP);
2230 open_dump_file (DFI_bp, NULL);
2234 close_dump_file (DFI_bp, NULL, NULL_RTX);
2235 timevar_pop (TV_DUMP);
2239 ASM_FILE_END (asm_out_file);
2242 /* Attach a special .ident directive to the end of the file to identify
2243 the version of GCC which compiled this code. The format of the .ident
2244 string is patterned after the ones produced by native SVR4 compilers. */
2247 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2248 IDENT_ASM_OP, version_string);
2251 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2253 timevar_push (TV_DUMP);
2254 dump_combine_total_stats (rtl_dump_file);
2255 close_dump_file (DFI_combine, NULL, NULL_RTX);
2256 timevar_pop (TV_DUMP);
2260 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2261 and TYPE_DECL nodes.
2263 This does nothing for local (non-static) variables, unless the
2264 variable is a register variable with an ASMSPEC. In that case, or
2265 if the variable is not an automatic, it sets up the RTL and
2266 outputs any assembler code (label definition, storage allocation
2267 and initialization).
2269 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2270 the assembler symbol name to be used. TOP_LEVEL is nonzero
2271 if this declaration is not within a function. */
2274 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2276 const char *asmspec;
2280 /* We deferred calling assemble_alias so that we could collect
2281 other attributes such as visibility. Emit the alias now. */
2284 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2287 alias = TREE_VALUE (TREE_VALUE (alias));
2288 alias = get_identifier (TREE_STRING_POINTER (alias));
2289 assemble_alias (decl, alias);
2293 /* Forward declarations for nested functions are not "external",
2294 but we need to treat them as if they were. */
2295 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2296 || TREE_CODE (decl) == FUNCTION_DECL)
2298 timevar_push (TV_VARCONST);
2301 make_decl_rtl (decl, asmspec);
2303 /* Don't output anything when a tentative file-scope definition
2304 is seen. But at end of compilation, do output code for them. */
2305 if (at_end || !DECL_DEFER_OUTPUT (decl))
2306 assemble_variable (decl, top_level, at_end, 0);
2308 #ifdef ASM_FINISH_DECLARE_OBJECT
2309 if (decl == last_assemble_variable_decl)
2311 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2316 timevar_pop (TV_VARCONST);
2318 else if (DECL_REGISTER (decl) && asmspec != 0)
2320 if (decode_reg_name (asmspec) >= 0)
2322 SET_DECL_RTL (decl, NULL_RTX);
2323 make_decl_rtl (decl, asmspec);
2327 error ("invalid register name `%s' for register variable", asmspec);
2328 DECL_REGISTER (decl) = 0;
2333 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2334 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2335 && TREE_CODE (decl) == TYPE_DECL)
2337 timevar_push (TV_SYMOUT);
2338 dbxout_symbol (decl, 0);
2339 timevar_pop (TV_SYMOUT);
2342 #ifdef SDB_DEBUGGING_INFO
2343 else if (write_symbols == SDB_DEBUG && top_level
2344 && TREE_CODE (decl) == TYPE_DECL)
2346 timevar_push (TV_SYMOUT);
2347 sdbout_symbol (decl, 0);
2348 timevar_pop (TV_SYMOUT);
2351 #ifdef DWARF2_DEBUGGING_INFO
2352 else if ((write_symbols == DWARF2_DEBUG
2353 || write_symbols == VMS_AND_DWARF2_DEBUG)
2355 && TREE_CODE (decl) == TYPE_DECL)
2357 timevar_push (TV_SYMOUT);
2358 dwarf2out_decl (decl);
2359 timevar_pop (TV_SYMOUT);
2364 /* Called after finishing a record, union or enumeral type. */
2367 rest_of_type_compilation (type, toplev)
2368 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2369 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2373 tree type ATTRIBUTE_UNUSED;
2374 int toplev ATTRIBUTE_UNUSED;
2377 /* Avoid confusing the debug information machinery when there are
2379 if (errorcount != 0 || sorrycount != 0)
2382 timevar_push (TV_SYMOUT);
2383 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2384 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2385 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2387 #ifdef SDB_DEBUGGING_INFO
2388 if (write_symbols == SDB_DEBUG)
2389 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2391 #ifdef DWARF2_DEBUGGING_INFO
2392 if ((write_symbols == DWARF2_DEBUG
2393 || write_symbols == VMS_AND_DWARF2_DEBUG)
2395 dwarf2out_decl (TYPE_STUB_DECL (type));
2397 timevar_pop (TV_SYMOUT);
2400 /* This is called from finish_function (within langhooks.parse_file)
2401 after each top-level definition is parsed.
2402 It is supposed to compile that function or variable
2403 and output the assembler code for it.
2404 After we return, the tree storage is freed. */
2407 rest_of_compilation (decl)
2413 int rebuild_label_notes_after_reload;
2415 timevar_push (TV_REST_OF_COMPILATION);
2417 /* Now that we're out of the frontend, we shouldn't have any more
2418 CONCATs anywhere. */
2419 generating_concat_p = 0;
2421 /* When processing delayed functions, prepare_function_start() won't
2422 have been run to re-initialize it. */
2423 cse_not_expected = ! optimize;
2425 /* First, make sure that NOTE_BLOCK is set correctly for each
2426 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2427 if (!cfun->x_whole_function_mode_p)
2430 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2431 tree in sensible shape. So, we just recalculate it here. */
2432 if (cfun->x_whole_function_mode_p)
2437 /* If we are reconsidering an inline function
2438 at the end of compilation, skip the stuff for making it inline. */
2440 if (DECL_SAVED_INSNS (decl) == 0)
2446 /* If this is nested inside an inlined external function, pretend
2447 it was only declared. Since we cannot inline such functions,
2448 generating code for this one is not only not necessary but will
2449 confuse some debugging output writers. */
2450 for (parent = DECL_CONTEXT (current_function_decl);
2451 parent != NULL_TREE;
2452 parent = get_containing_scope (parent))
2453 if (TREE_CODE (parent) == FUNCTION_DECL
2454 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2456 DECL_INITIAL (decl) = 0;
2457 goto exit_rest_of_compilation;
2459 else if (TYPE_P (parent))
2460 /* A function in a local class should be treated normally. */
2463 /* If requested, consider whether to make this function inline. */
2464 if ((DECL_INLINE (decl) && !flag_no_inline)
2465 || flag_inline_functions)
2467 timevar_push (TV_INTEGRATION);
2468 lose = function_cannot_inline_p (decl);
2469 timevar_pop (TV_INTEGRATION);
2470 if (lose || ! optimize)
2472 if (warn_inline && DECL_INLINE (decl))
2473 warning_with_decl (decl, lose);
2474 DECL_ABSTRACT_ORIGIN (decl) = 0;
2475 /* Don't really compile an extern inline function.
2476 If we can't make it inline, pretend
2477 it was only declared. */
2478 if (DECL_EXTERNAL (decl))
2480 DECL_INITIAL (decl) = 0;
2481 goto exit_rest_of_compilation;
2485 /* ??? Note that we used to just make it look like if
2486 the "inline" keyword was specified when we decide
2487 to inline it (because of -finline-functions).
2488 garloff@suse.de, 2002-04-24: Add another flag to
2489 actually record this piece of information. */
2490 if (!DECL_INLINE (decl))
2491 DID_INLINE_FUNC (decl) = 1;
2492 inlinable = DECL_INLINE (decl) = 1;
2496 insns = get_insns ();
2498 /* Dump the rtl code if we are dumping rtl. */
2500 if (open_dump_file (DFI_rtl, decl))
2502 if (DECL_SAVED_INSNS (decl))
2503 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2504 close_dump_file (DFI_rtl, print_rtl, insns);
2507 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2508 sorts of eh initialization. Delay this until after the
2509 initial rtl dump so that we can see the original nesting. */
2510 convert_from_eh_region_ranges ();
2512 /* If function is inline, and we don't yet know whether to
2513 compile it by itself, defer decision till end of compilation.
2514 wrapup_global_declarations will (indirectly) call
2515 rest_of_compilation again for those functions that need to
2516 be output. Also defer those functions that we are supposed
2520 || (DECL_INLINE (decl)
2521 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2522 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2523 && ! flag_keep_inline_functions)
2524 || DECL_EXTERNAL (decl))))
2525 DECL_DEFER_OUTPUT (decl) = 1;
2527 if (DECL_INLINE (decl))
2528 /* DWARF wants separate debugging info for abstract and
2529 concrete instances of all inline functions, including those
2530 declared inline but not inlined, and those inlined even
2531 though they weren't declared inline. Conveniently, that's
2532 what DECL_INLINE means at this point. */
2533 (*debug_hooks->deferred_inline_function) (decl);
2535 if (DECL_DEFER_OUTPUT (decl))
2537 /* If -Wreturn-type, we have to do a bit of compilation. We just
2538 want to call cleanup the cfg to figure out whether or not we can
2539 fall off the end of the function; we do the minimum amount of
2540 work necessary to make that safe. */
2541 if (warn_return_type)
2543 int saved_optimize = optimize;
2546 rebuild_jump_labels (insns);
2547 find_exception_handler_labels ();
2548 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2549 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2550 optimize = saved_optimize;
2552 /* CFG is no longer maintained up-to-date. */
2553 free_bb_for_insn ();
2556 set_nothrow_function_flags ();
2557 if (current_function_nothrow)
2558 /* Now we know that this can't throw; set the flag for the benefit
2559 of other functions later in this translation unit. */
2560 TREE_NOTHROW (current_function_decl) = 1;
2562 timevar_push (TV_INTEGRATION);
2563 save_for_inline (decl);
2564 timevar_pop (TV_INTEGRATION);
2565 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2566 goto exit_rest_of_compilation;
2569 /* If specified extern inline but we aren't inlining it, we are
2570 done. This goes for anything that gets here with DECL_EXTERNAL
2571 set, not just things with DECL_INLINE. */
2572 if (DECL_EXTERNAL (decl))
2573 goto exit_rest_of_compilation;
2576 /* If we're emitting a nested function, make sure its parent gets
2577 emitted as well. Doing otherwise confuses debug info. */
2580 for (parent = DECL_CONTEXT (current_function_decl);
2581 parent != NULL_TREE;
2582 parent = get_containing_scope (parent))
2583 if (TREE_CODE (parent) == FUNCTION_DECL)
2584 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2587 /* We are now committed to emitting code for this function. Do any
2588 preparation, such as emitting abstract debug info for the inline
2589 before it gets mangled by optimization. */
2590 if (DECL_INLINE (decl))
2591 (*debug_hooks->outlining_inline_function) (decl);
2593 /* Remove any notes we don't need. That will make iterating
2594 over the instruction sequence faster, and allow the garbage
2595 collector to reclaim the memory used by the notes. */
2596 remove_unnecessary_notes ();
2601 /* Initialize some variables used by the optimizers. */
2602 init_function_for_compilation ();
2604 if (! DECL_DEFER_OUTPUT (decl))
2605 TREE_ASM_WRITTEN (decl) = 1;
2607 /* Now that integrate will no longer see our rtl, we need not
2608 distinguish between the return value of this function and the
2609 return value of called functions. Also, we can remove all SETs
2610 of subregs of hard registers; they are only here because of
2611 integrate. Also, we can now initialize pseudos intended to
2612 carry magic hard reg data throughout the function. */
2613 rtx_equal_function_value_matters = 0;
2614 purge_hard_subreg_sets (get_insns ());
2616 /* Early return if there were errors. We can run afoul of our
2617 consistency checks, and there's not really much point in fixing them.
2618 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2619 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2620 || errorcount || sorrycount)
2621 goto exit_rest_of_compilation;
2623 timevar_push (TV_JUMP);
2624 open_dump_file (DFI_sibling, decl);
2625 insns = get_insns ();
2626 rebuild_jump_labels (insns);
2627 find_exception_handler_labels ();
2628 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2630 delete_unreachable_blocks ();
2632 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2633 if (flag_guess_branch_prob)
2635 timevar_push (TV_BRANCH_PROB);
2636 note_prediction_to_br_prob ();
2637 timevar_pop (TV_BRANCH_PROB);
2640 /* We may have potential sibling or tail recursion sites. Select one
2641 (of possibly multiple) methods of performing the call. */
2642 if (flag_optimize_sibling_calls)
2645 optimize_sibling_and_tail_recursive_calls ();
2647 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2648 free_bb_for_insn ();
2649 find_exception_handler_labels ();
2650 rebuild_jump_labels (insns);
2651 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2653 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2654 notes before simplifying cfg and we must do lowering after sibcall
2655 that unhides parts of RTL chain and cleans up the CFG.
2657 Until sibcall is replaced by tree-level optimizer, lets just
2658 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2659 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2660 if (GET_CODE (insn) == NOTE
2661 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2664 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2665 timevar_pop (TV_JUMP);
2667 scope_to_insns_initialize ();
2668 /* Complete generation of exception handling code. */
2671 timevar_push (TV_JUMP);
2672 open_dump_file (DFI_eh, decl);
2674 finish_eh_generation ();
2676 close_dump_file (DFI_eh, print_rtl, get_insns ());
2677 timevar_pop (TV_JUMP);
2680 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2681 generation, which might create new sets. */
2682 emit_initial_value_sets ();
2685 /* If we are doing position-independent code generation, now
2686 is the time to output special prologues and epilogues.
2687 We do not want to do this earlier, because it just clutters
2688 up inline functions with meaningless insns. */
2693 insns = get_insns ();
2695 /* Copy any shared structure that should not be shared. */
2696 unshare_all_rtl (current_function_decl, insns);
2698 #ifdef SETJMP_VIA_SAVE_AREA
2699 /* This must be performed before virtual register instantiation.
2700 Please be aware the everything in the compiler that can look
2701 at the RTL up to this point must understand that REG_SAVE_AREA
2702 is just like a use of the REG contained inside. */
2703 if (current_function_calls_alloca)
2704 optimize_save_area_alloca (insns);
2707 /* Instantiate all virtual registers. */
2708 instantiate_virtual_regs (current_function_decl, insns);
2710 open_dump_file (DFI_jump, decl);
2712 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2713 are initialized and to compute whether control can drop off the end
2716 timevar_push (TV_JUMP);
2717 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2718 before jump optimization switches branch directions. */
2719 if (flag_guess_branch_prob)
2720 expected_value_to_br_prob ();
2722 reg_scan (insns, max_reg_num (), 0);
2723 rebuild_jump_labels (insns);
2724 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2725 delete_trivially_dead_insns (insns, max_reg_num ());
2727 dump_flow_info (rtl_dump_file);
2728 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2729 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2733 free_bb_for_insn ();
2734 copy_loop_headers (insns);
2735 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2737 purge_line_number_notes (insns);
2739 timevar_pop (TV_JUMP);
2740 close_dump_file (DFI_jump, print_rtl, insns);
2742 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2743 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2745 goto exit_rest_of_compilation;
2748 /* Long term, this should probably move before the jump optimizer too,
2749 but I didn't want to disturb the rtl_dump_and_exit and related
2750 stuff at this time. */
2751 if (optimize > 0 && flag_ssa)
2753 /* Convert to SSA form. */
2755 timevar_push (TV_TO_SSA);
2756 open_dump_file (DFI_ssa, decl);
2758 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2761 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2762 timevar_pop (TV_TO_SSA);
2764 /* Perform sparse conditional constant propagation, if requested. */
2767 timevar_push (TV_SSA_CCP);
2768 open_dump_file (DFI_ssa_ccp, decl);
2772 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2773 timevar_pop (TV_SSA_CCP);
2776 /* It would be useful to cleanup the CFG at this point, but block
2777 merging and possibly other transformations might leave a PHI
2778 node in the middle of a basic block, which is a strict no-no. */
2780 /* The SSA implementation uses basic block numbers in its phi
2781 nodes. Thus, changing the control-flow graph or the basic
2782 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2783 may cause problems. */
2787 /* Remove dead code. */
2789 timevar_push (TV_SSA_DCE);
2790 open_dump_file (DFI_ssa_dce, decl);
2792 insns = get_insns ();
2793 ssa_eliminate_dead_code ();
2795 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2796 timevar_pop (TV_SSA_DCE);
2799 /* Convert from SSA form. */
2801 timevar_push (TV_FROM_SSA);
2802 open_dump_file (DFI_ussa, decl);
2804 convert_from_ssa ();
2805 /* New registers have been created. Rescan their usage. */
2806 reg_scan (insns, max_reg_num (), 1);
2808 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2809 timevar_pop (TV_FROM_SSA);
2814 timevar_push (TV_JUMP);
2816 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2818 /* Try to identify useless null pointer tests and delete them. */
2819 if (flag_delete_null_pointer_checks)
2821 open_dump_file (DFI_null, decl);
2823 dump_flow_info (rtl_dump_file);
2825 if (delete_null_pointer_checks (insns))
2826 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2828 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2831 /* Jump optimization, and the removal of NULL pointer checks, may
2832 have reduced the number of instructions substantially. CSE, and
2833 future passes, allocate arrays whose dimensions involve the
2834 maximum instruction UID, so if we can reduce the maximum UID
2835 we'll save big on memory. */
2836 renumber_insns (rtl_dump_file);
2837 timevar_pop (TV_JUMP);
2839 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2843 /* Perform common subexpression elimination.
2844 Nonzero value from `cse_main' means that jumps were simplified
2845 and some code may now be unreachable, so do
2846 jump optimization again. */
2850 open_dump_file (DFI_cse, decl);
2852 dump_flow_info (rtl_dump_file);
2853 timevar_push (TV_CSE);
2855 reg_scan (insns, max_reg_num (), 1);
2857 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2859 rebuild_jump_labels (insns);
2860 purge_all_dead_edges (0);
2862 delete_trivially_dead_insns (insns, max_reg_num ());
2864 /* If we are not running more CSE passes, then we are no longer
2865 expecting CSE to be run. But always rerun it in a cheap mode. */
2866 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2868 if (tem || optimize > 1)
2869 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2870 /* Try to identify useless null pointer tests and delete them. */
2871 if (flag_delete_null_pointer_checks)
2873 timevar_push (TV_JUMP);
2875 if (delete_null_pointer_checks (insns))
2876 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2877 timevar_pop (TV_JUMP);
2880 /* The second pass of jump optimization is likely to have
2881 removed a bunch more instructions. */
2882 renumber_insns (rtl_dump_file);
2884 timevar_pop (TV_CSE);
2885 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2888 open_dump_file (DFI_addressof, decl);
2890 purge_addressof (insns);
2892 purge_all_dead_edges (0);
2893 reg_scan (insns, max_reg_num (), 1);
2895 close_dump_file (DFI_addressof, print_rtl, insns);
2899 /* Perform global cse. */
2901 if (optimize > 0 && flag_gcse)
2903 int save_csb, save_cfj;
2906 timevar_push (TV_GCSE);
2907 open_dump_file (DFI_gcse, decl);
2909 tem = gcse_main (insns, rtl_dump_file);
2910 rebuild_jump_labels (insns);
2911 delete_trivially_dead_insns (insns, max_reg_num ());
2913 save_csb = flag_cse_skip_blocks;
2914 save_cfj = flag_cse_follow_jumps;
2915 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2917 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2919 if (flag_expensive_optimizations)
2921 timevar_push (TV_CSE);
2922 reg_scan (insns, max_reg_num (), 1);
2923 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2924 purge_all_dead_edges (0);
2925 delete_trivially_dead_insns (insns, max_reg_num ());
2926 timevar_pop (TV_CSE);
2927 cse_not_expected = !flag_rerun_cse_after_loop;
2930 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2931 things up. Then possibly re-run CSE again. */
2935 timevar_push (TV_JUMP);
2936 rebuild_jump_labels (insns);
2937 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2938 timevar_pop (TV_JUMP);
2940 if (flag_expensive_optimizations)
2942 timevar_push (TV_CSE);
2943 reg_scan (insns, max_reg_num (), 1);
2944 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2945 purge_all_dead_edges (0);
2946 delete_trivially_dead_insns (insns, max_reg_num ());
2947 timevar_pop (TV_CSE);
2951 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2952 timevar_pop (TV_GCSE);
2955 flag_cse_skip_blocks = save_csb;
2956 flag_cse_follow_jumps = save_cfj;
2957 #ifdef ENABLE_CHECKING
2958 verify_flow_info ();
2962 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2963 if (optimize > 0 && flag_gcse && current_function_calls_constant_p)
2964 purge_builtin_constant_p ();
2966 /* Move constant computations out of loops. */
2968 if (optimize > 0 && flag_loop_optimize)
2970 int do_unroll, do_prefetch;
2972 timevar_push (TV_LOOP);
2973 delete_dead_jumptables ();
2974 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2975 open_dump_file (DFI_loop, decl);
2976 /* CFG is no longer maintained up-to-date. */
2977 free_bb_for_insn ();
2979 if (flag_unroll_loops)
2980 do_unroll = 0; /* Having two unrollers is useless. */
2982 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2983 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2984 if (flag_rerun_loop_opt)
2986 cleanup_barriers ();
2988 /* We only want to perform unrolling once. */
2989 loop_optimize (insns, rtl_dump_file, do_unroll);
2992 /* The first call to loop_optimize makes some instructions
2993 trivially dead. We delete those instructions now in the
2994 hope that doing so will make the heuristics in loop work
2995 better and possibly speed up compilation. */
2996 delete_trivially_dead_insns (insns, max_reg_num ());
2998 /* The regscan pass is currently necessary as the alias
2999 analysis code depends on this information. */
3000 reg_scan (insns, max_reg_num (), 1);
3002 cleanup_barriers ();
3003 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3005 /* Loop can create trivially dead instructions. */
3006 delete_trivially_dead_insns (insns, max_reg_num ());
3007 close_dump_file (DFI_loop, print_rtl, insns);
3008 timevar_pop (TV_LOOP);
3009 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3014 /* Perform jump bypassing and control flow optimizations. */
3015 if (optimize > 0 && flag_gcse)
3017 timevar_push (TV_BYPASS);
3018 open_dump_file (DFI_bypass, decl);
3020 cleanup_cfg (CLEANUP_EXPENSIVE);
3021 tem = bypass_jumps (rtl_dump_file);
3025 rebuild_jump_labels (insns);
3026 cleanup_cfg (CLEANUP_EXPENSIVE);
3027 delete_trivially_dead_insns (insns, max_reg_num ());
3030 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
3031 timevar_pop (TV_BYPASS);
3035 #ifdef ENABLE_CHECKING
3036 verify_flow_info ();
3040 /* Do control and data flow analysis; wrote some of the results to
3043 timevar_push (TV_FLOW);
3044 open_dump_file (DFI_cfg, decl);
3046 dump_flow_info (rtl_dump_file);
3048 cleanup_cfg (CLEANUP_EXPENSIVE
3049 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3051 /* It may make more sense to mark constant functions after dead code is
3052 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3053 may insert code making function non-constant, but we still must consider
3054 it as constant, otherwise -fbranch-probabilities will not read data back.
3056 life_analysis rarely eliminates modification of external memory.
3059 mark_constant_function ();
3061 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3063 /* Do branch profiling and static profile estimation passes. */
3064 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3068 timevar_push (TV_BRANCH_PROB);
3069 open_dump_file (DFI_bp, decl);
3070 if (cfun->arc_profile || flag_branch_probabilities)
3073 /* Discover and record the loop depth at the head of each basic
3074 block. The loop infrastructure does the real job for us. */
3075 flow_loops_find (&loops, LOOP_TREE);
3078 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3080 /* Estimate using heuristics if no profiling info is available. */
3081 if (flag_guess_branch_prob)
3082 estimate_probability (&loops);
3084 flow_loops_free (&loops);
3085 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3086 timevar_pop (TV_BRANCH_PROB);
3090 open_dump_file (DFI_ce1, decl);
3091 if (flag_if_conversion)
3093 timevar_push (TV_IFCVT);
3095 dump_flow_info (rtl_dump_file);
3096 cleanup_cfg (CLEANUP_EXPENSIVE);
3097 reg_scan (insns, max_reg_num (), 0);
3099 timevar_pop (TV_IFCVT);
3101 timevar_push (TV_JUMP);
3102 cleanup_cfg (CLEANUP_EXPENSIVE);
3103 reg_scan (insns, max_reg_num (), 0);
3104 timevar_pop (TV_JUMP);
3105 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3109 timevar_push (TV_TRACER);
3110 open_dump_file (DFI_tracer, decl);
3112 dump_flow_info (rtl_dump_file);
3114 cleanup_cfg (CLEANUP_EXPENSIVE);
3115 reg_scan (insns, max_reg_num (), 0);
3116 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3117 timevar_pop (TV_TRACER);
3120 /* Perform loop optimalizations. It might be better to do them a bit
3121 sooner, but we want the profile feedback to work more efficiently. */
3123 && (flag_unswitch_loops
3125 || flag_unroll_loops))
3127 struct loops *loops;
3128 timevar_push (TV_LOOP);
3129 open_dump_file (DFI_loop2, decl);
3131 dump_flow_info (rtl_dump_file);
3133 loops = loop_optimizer_init (rtl_dump_file);
3137 /* The optimalizations: */
3138 if (flag_unswitch_loops)
3139 unswitch_loops (loops);
3141 if (flag_peel_loops || flag_unroll_loops)
3142 unroll_and_peel_loops (loops,
3143 (flag_peel_loops ? UAP_PEEL : 0) |
3144 (flag_unroll_loops ? UAP_UNROLL : 0) |
3145 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3147 loop_optimizer_finalize (loops, rtl_dump_file);
3150 cleanup_cfg (CLEANUP_EXPENSIVE);
3151 delete_trivially_dead_insns (insns, max_reg_num ());
3152 reg_scan (insns, max_reg_num (), 0);
3154 dump_flow_info (rtl_dump_file);
3155 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3156 timevar_pop (TV_LOOP);
3160 if (flag_rerun_cse_after_loop)
3162 timevar_push (TV_CSE2);
3163 open_dump_file (DFI_cse2, decl);
3165 dump_flow_info (rtl_dump_file);
3166 /* CFG is no longer maintained up-to-date. */
3167 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3168 purge_all_dead_edges (0);
3169 delete_trivially_dead_insns (insns, max_reg_num ());
3173 timevar_push (TV_JUMP);
3174 rebuild_jump_labels (insns);
3175 cleanup_cfg (CLEANUP_EXPENSIVE);
3176 timevar_pop (TV_JUMP);
3178 reg_scan (insns, max_reg_num (), 0);
3179 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3181 timevar_pop (TV_CSE2);
3184 cse_not_expected = 1;
3186 open_dump_file (DFI_life, decl);
3189 check_function_return_warnings ();
3191 #ifdef ENABLE_CHECKING
3192 verify_flow_info ();
3194 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3196 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3197 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3198 timevar_pop (TV_FLOW);
3202 if (warn_uninitialized || extra_warnings)
3204 uninitialized_vars_warning (DECL_INITIAL (decl));
3206 setjmp_args_warning ();
3212 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3214 /* Insns were inserted, so things might look a bit different. */
3215 insns = get_insns ();
3216 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3217 PROP_LOG_LINKS | PROP_REG_INFO
3218 | PROP_DEATH_NOTES);
3222 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3226 /* If -opt, try combining insns through substitution. */
3230 int rebuild_jump_labels_after_combine = 0;
3232 timevar_push (TV_COMBINE);
3233 open_dump_file (DFI_combine, decl);
3235 rebuild_jump_labels_after_combine
3236 = combine_instructions (insns, max_reg_num ());
3238 /* Combining insns may have turned an indirect jump into a
3239 direct jump. Rebuild the JUMP_LABEL fields of jumping
3241 if (rebuild_jump_labels_after_combine)
3243 timevar_push (TV_JUMP);
3244 rebuild_jump_labels (insns);
3245 timevar_pop (TV_JUMP);
3247 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3250 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3251 timevar_pop (TV_COMBINE);
3256 /* Rerun if-conversion, as combine may have simplified things enough to
3257 now meet sequence length restrictions. */
3258 if (flag_if_conversion)
3260 timevar_push (TV_IFCVT);
3261 open_dump_file (DFI_ce2, decl);
3267 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3268 timevar_pop (TV_IFCVT);
3271 /* Register allocation pre-pass, to reduce number of moves
3272 necessary for two-address machines. */
3273 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3275 timevar_push (TV_REGMOVE);
3276 open_dump_file (DFI_regmove, decl);
3278 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3280 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3281 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3282 timevar_pop (TV_REGMOVE);
3287 /* Do unconditional splitting before register allocation to allow machine
3288 description to add extra information not needed previously. */
3289 split_all_insns (1);
3291 #ifdef OPTIMIZE_MODE_SWITCHING
3292 timevar_push (TV_MODE_SWITCH);
3295 optimize_mode_switching (NULL);
3298 timevar_pop (TV_MODE_SWITCH);
3301 /* Any of the several passes since flow1 will have munged register
3302 lifetime data a bit. We need it to be up to date for scheduling
3303 (see handling of reg_known_equiv in init_alias_analysis). */
3304 recompute_reg_usage (insns, !optimize_size);
3306 timevar_push (TV_SCHED);
3308 #ifdef INSN_SCHEDULING
3310 /* Print function header into sched dump now
3311 because doing the sched analysis makes some of the dump. */
3312 if (optimize > 0 && flag_schedule_insns)
3314 open_dump_file (DFI_sched, decl);
3316 /* Do control and data sched analysis,
3317 and write some of the results to dump file. */
3319 schedule_insns (rtl_dump_file);
3321 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3324 timevar_pop (TV_SCHED);
3328 /* Determine if the current function is a leaf before running reload
3329 since this can impact optimizations done by the prologue and
3330 epilogue thus changing register elimination offsets. */
3331 current_function_is_leaf = leaf_function_p ();
3333 timevar_push (TV_LOCAL_ALLOC);
3334 open_dump_file (DFI_lreg, decl);
3336 /* Allocate pseudo-regs that are used only within 1 basic block.
3338 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3339 jump optimizer after register allocation and reloading are finished. */
3341 if (flag_new_regalloc)
3343 delete_trivially_dead_insns (insns, max_reg_num ());
3346 timevar_pop (TV_LOCAL_ALLOC);
3347 if (dump_file[DFI_lreg].enabled)
3349 timevar_push (TV_DUMP);
3351 close_dump_file (DFI_lreg, NULL, NULL);
3352 timevar_pop (TV_DUMP);
3355 /* XXX clean up the whole mess to bring live info in shape again. */
3356 timevar_push (TV_GLOBAL_ALLOC);
3357 open_dump_file (DFI_greg, decl);
3359 build_insn_chain (insns);
3360 failure = reload (insns, 0);
3362 timevar_pop (TV_GLOBAL_ALLOC);
3364 if (dump_file[DFI_greg].enabled)
3366 timevar_push (TV_DUMP);
3368 dump_global_regs (rtl_dump_file);
3370 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3371 timevar_pop (TV_DUMP);
3375 goto exit_rest_of_compilation;
3376 reload_completed = 1;
3377 rebuild_label_notes_after_reload = 0;
3381 /* Allocate the reg_renumber array. */
3382 allocate_reg_info (max_regno, FALSE, TRUE);
3384 /* And the reg_equiv_memory_loc array. */
3385 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3387 allocate_initial_values (reg_equiv_memory_loc);
3389 regclass (insns, max_reg_num (), rtl_dump_file);
3390 rebuild_label_notes_after_reload = local_alloc ();
3392 timevar_pop (TV_LOCAL_ALLOC);
3394 if (dump_file[DFI_lreg].enabled)
3396 timevar_push (TV_DUMP);
3398 dump_flow_info (rtl_dump_file);
3399 dump_local_alloc (rtl_dump_file);
3401 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3402 timevar_pop (TV_DUMP);
3407 timevar_push (TV_GLOBAL_ALLOC);
3408 open_dump_file (DFI_greg, decl);
3410 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3411 pass fixing up any insns that are invalid. */
3414 failure = global_alloc (rtl_dump_file);
3417 build_insn_chain (insns);
3418 failure = reload (insns, 0);
3421 timevar_pop (TV_GLOBAL_ALLOC);
3423 if (dump_file[DFI_greg].enabled)
3425 timevar_push (TV_DUMP);
3427 dump_global_regs (rtl_dump_file);
3429 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3430 timevar_pop (TV_DUMP);
3434 goto exit_rest_of_compilation;
3439 open_dump_file (DFI_postreload, decl);
3441 /* Do a very simple CSE pass over just the hard registers. */
3444 timevar_push (TV_RELOAD_CSE_REGS);
3445 reload_cse_regs (insns);
3446 timevar_pop (TV_RELOAD_CSE_REGS);
3449 /* Register allocation and reloading may have turned an indirect jump into
3450 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3451 jumping instructions. */
3452 if (rebuild_label_notes_after_reload)
3454 timevar_push (TV_JUMP);
3456 rebuild_jump_labels (insns);
3457 purge_all_dead_edges (0);
3459 timevar_pop (TV_JUMP);
3462 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3464 /* Re-create the death notes which were deleted during reload. */
3465 timevar_push (TV_FLOW2);
3466 open_dump_file (DFI_flow2, decl);
3468 #ifdef ENABLE_CHECKING
3469 verify_flow_info ();
3472 /* If optimizing, then go ahead and split insns now. */
3476 split_all_insns (0);
3479 cleanup_cfg (CLEANUP_EXPENSIVE);
3481 /* On some machines, the prologue and epilogue code, or parts thereof,
3482 can be represented as RTL. Doing so lets us schedule insns between
3483 it and the rest of the code and also allows delayed branch
3484 scheduling to operate in the epilogue. */
3485 thread_prologue_and_epilogue_insns (insns);
3489 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3490 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3491 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3493 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3494 even for machines with possibly nonzero RETURN_POPS_ARGS
3495 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3496 push instructions will have popping returns. */
3497 #ifndef PUSH_ROUNDING
3498 if (!ACCUMULATE_OUTGOING_ARGS)
3500 combine_stack_adjustments ();
3505 flow2_completed = 1;
3507 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3508 timevar_pop (TV_FLOW2);
3510 #ifdef HAVE_peephole2
3511 if (optimize > 0 && flag_peephole2)
3513 timevar_push (TV_PEEPHOLE2);
3514 open_dump_file (DFI_peephole2, decl);
3516 peephole2_optimize (rtl_dump_file);
3518 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3519 timevar_pop (TV_PEEPHOLE2);
3523 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3525 timevar_push (TV_RENAME_REGISTERS);
3526 open_dump_file (DFI_rnreg, decl);
3528 if (flag_rename_registers)
3529 regrename_optimize ();
3530 if (flag_cprop_registers)
3531 copyprop_hardreg_forward ();
3533 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3534 timevar_pop (TV_RENAME_REGISTERS);
3539 timevar_push (TV_REORDER_BLOCKS);
3540 open_dump_file (DFI_bbro, decl);
3542 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3543 splitting possibly introduced more crossjumping opportunities. */
3544 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3545 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3547 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
3549 if (flag_reorder_blocks)
3550 reorder_basic_blocks ();
3551 if (flag_reorder_blocks
3552 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
3553 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3555 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3556 timevar_pop (TV_REORDER_BLOCKS);
3559 if (flag_if_conversion2)
3561 timevar_push (TV_IFCVT2);
3562 open_dump_file (DFI_ce3, decl);
3566 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3567 timevar_pop (TV_IFCVT2);
3570 #ifdef INSN_SCHEDULING
3571 if (optimize > 0 && flag_schedule_insns_after_reload)
3573 timevar_push (TV_SCHED2);
3574 open_dump_file (DFI_sched2, decl);
3576 /* Do control and data sched analysis again,
3577 and write some more of the results to dump file. */
3579 split_all_insns (1);
3581 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
3583 schedule_ebbs (rtl_dump_file);
3584 /* No liveness updating code yet, but it should be easy to do.
3585 reg-stack recompute the liveness when needed for now. */
3586 count_or_remove_death_notes (NULL, 1);
3587 cleanup_cfg (CLEANUP_EXPENSIVE);
3590 schedule_insns (rtl_dump_file);
3592 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3593 timevar_pop (TV_SCHED2);
3599 #ifdef LEAF_REGISTERS
3600 current_function_uses_only_leaf_regs
3601 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3605 timevar_push (TV_REG_STACK);
3606 open_dump_file (DFI_stack, decl);
3608 if (reg_to_stack (insns, rtl_dump_file) && optimize)
3610 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3611 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
3612 && flag_reorder_blocks)
3614 reorder_basic_blocks ();
3615 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3619 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3620 timevar_pop (TV_REG_STACK);
3624 compute_alignments ();
3626 /* CFG is no longer maintained up-to-date. */
3627 free_bb_for_insn ();
3629 /* If a machine dependent reorganization is needed, call it. */
3630 #ifdef MACHINE_DEPENDENT_REORG
3631 timevar_push (TV_MACH_DEP);
3632 open_dump_file (DFI_mach, decl);
3634 MACHINE_DEPENDENT_REORG (insns);
3636 close_dump_file (DFI_mach, print_rtl, insns);
3637 timevar_pop (TV_MACH_DEP);
3642 purge_line_number_notes (insns);
3643 cleanup_barriers ();
3645 /* If a scheduling pass for delayed branches is to be done,
3646 call the scheduling code. */
3649 if (optimize > 0 && flag_delayed_branch)
3651 timevar_push (TV_DBR_SCHED);
3652 open_dump_file (DFI_dbr, decl);
3654 dbr_schedule (insns, rtl_dump_file);
3656 close_dump_file (DFI_dbr, print_rtl, insns);
3657 timevar_pop (TV_DBR_SCHED);
3663 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3664 timevar_push (TV_SHORTEN_BRANCH);
3665 split_all_insns_noflow ();
3666 timevar_pop (TV_SHORTEN_BRANCH);
3669 convert_to_eh_region_ranges ();
3671 /* Shorten branches. */
3672 timevar_push (TV_SHORTEN_BRANCH);
3673 shorten_branches (get_insns ());
3674 timevar_pop (TV_SHORTEN_BRANCH);
3676 set_nothrow_function_flags ();
3677 if (current_function_nothrow)
3678 /* Now we know that this can't throw; set the flag for the benefit
3679 of other functions later in this translation unit. */
3680 TREE_NOTHROW (current_function_decl) = 1;
3682 /* Now turn the rtl into assembler code. */
3684 timevar_push (TV_FINAL);
3689 /* Get the function's name, as described by its RTL. This may be
3690 different from the DECL_NAME name used in the source file. */
3692 x = DECL_RTL (decl);
3693 if (GET_CODE (x) != MEM)
3696 if (GET_CODE (x) != SYMBOL_REF)
3698 fnname = XSTR (x, 0);
3700 assemble_start_function (decl, fnname);
3701 final_start_function (insns, asm_out_file, optimize);
3702 final (insns, asm_out_file, optimize, 0);
3703 final_end_function ();
3705 #ifdef IA64_UNWIND_INFO
3706 /* ??? The IA-64 ".handlerdata" directive must be issued before
3707 the ".endp" directive that closes the procedure descriptor. */
3708 output_function_exception_table ();
3711 assemble_end_function (decl, fnname);
3713 #ifndef IA64_UNWIND_INFO
3714 /* Otherwise, it feels unclean to switch sections in the middle. */
3715 output_function_exception_table ();
3719 fflush (asm_out_file);
3721 /* Release all memory allocated by flow. */
3722 free_basic_block_vars (0);
3724 /* Release all memory held by regsets now. */
3725 regset_release_memory ();
3727 timevar_pop (TV_FINAL);
3731 /* Write DBX symbols if requested. */
3733 /* Note that for those inline functions where we don't initially
3734 know for certain that we will be generating an out-of-line copy,
3735 the first invocation of this routine (rest_of_compilation) will
3736 skip over this code by doing a `goto exit_rest_of_compilation;'.
3737 Later on, wrapup_global_declarations will (indirectly) call
3738 rest_of_compilation again for those inline functions that need
3739 to have out-of-line copies generated. During that call, we
3740 *will* be routed past here. */
3742 timevar_push (TV_SYMOUT);
3743 (*debug_hooks->function_decl) (decl);
3744 timevar_pop (TV_SYMOUT);
3746 exit_rest_of_compilation:
3748 /* In case the function was not output,
3749 don't leave any temporary anonymous types
3750 queued up for sdb output. */
3751 #ifdef SDB_DEBUGGING_INFO
3752 if (write_symbols == SDB_DEBUG)
3753 sdbout_types (NULL_TREE);
3756 reload_completed = 0;
3757 flow2_completed = 0;
3760 timevar_push (TV_FINAL);
3762 /* Clear out the insn_length contents now that they are no
3764 init_insn_lengths ();
3766 /* Show no temporary slots allocated. */
3769 free_basic_block_vars (0);
3770 free_bb_for_insn ();
3772 timevar_pop (TV_FINAL);
3774 /* Make sure volatile mem refs aren't considered valid operands for
3775 arithmetic insns. We must call this here if this is a nested inline
3776 function, since the above code leaves us in the init_recog state
3777 (from final.c), and the function context push/pop code does not
3778 save/restore volatile_ok.
3780 ??? Maybe it isn't necessary for expand_start_function to call this
3781 anymore if we do it here? */
3783 init_recog_no_volatile ();
3785 /* We're done with this function. Free up memory if we can. */
3786 free_after_parsing (cfun);
3787 if (! DECL_DEFER_OUTPUT (decl))
3789 free_after_compilation (cfun);
3791 /* Clear integrate.c's pointer to the cfun structure we just
3793 DECL_SAVED_INSNS (decl) = 0;
3799 timevar_pop (TV_REST_OF_COMPILATION);
3809 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3810 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3811 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3812 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3813 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3814 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"));
3815 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3817 for (i = ARRAY_SIZE (f_options); i--;)
3819 const char *description = f_options[i].description;
3821 if (description != NULL && *description != 0)
3822 printf (" -f%-21s %s\n",
3823 f_options[i].string, _(description));
3826 printf (_(" -O[number] Set optimization level to [number]\n"));
3827 printf (_(" -Os Optimize for space rather than speed\n"));
3828 for (i = LAST_PARAM; i--;)
3830 const char *description = compiler_params[i].help;
3831 const int length = 21 - strlen (compiler_params[i].option);
3833 if (description != NULL && *description != 0)
3834 printf (" --param %s=<value>%.*s%s\n",
3835 compiler_params[i].option,
3836 length > 0 ? length : 1, " ",
3839 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3840 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3841 printf (_(" -w Suppress warnings\n"));
3843 for (i = ARRAY_SIZE (W_options); i--;)
3845 const char *description = W_options[i].description;
3847 if (description != NULL && *description != 0)
3848 printf (" -W%-21s %s\n",
3849 W_options[i].string, _(description));
3852 printf (_(" -Wunused Enable unused warnings\n"));
3853 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3854 printf (_(" -p Enable function profiling\n"));
3855 printf (_(" -o <file> Place output into <file> \n"));
3857 -G <number> Put global and static data smaller than <number>\n\
3858 bytes into a special section (on some targets)\n"));
3860 for (i = ARRAY_SIZE (debug_args); i--;)
3862 if (debug_args[i].description != NULL)
3863 printf (" -g%-21s %s\n",
3864 debug_args[i].arg, _(debug_args[i].description));
3867 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3868 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3869 printf (_(" -version Display the compiler's version\n"));
3870 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3871 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3872 #if defined INSN_SCHEDULING
3873 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3875 printf (_(" --help Display this information\n"));
3880 /* Display descriptions of language specific options.
3881 If there is no description, note that there is an undocumented option.
3882 If the description is empty, do not display anything. (This allows
3883 options to be deliberately undocumented, for whatever reason).
3884 If the option string is missing, then this is a marker, indicating
3885 that the description string is in fact the name of a language, whose
3886 language specific options are to follow. */
3888 if (ARRAY_SIZE (documented_lang_options) > 1)
3890 printf (_("\nLanguage specific options:\n"));
3892 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3894 const char *description = documented_lang_options[i].description;
3895 const char *option = documented_lang_options[i].option;
3897 if (description == NULL)
3902 printf (_(" %-23.23s [undocumented]\n"), option);
3904 else if (*description == 0)
3906 else if (option == NULL)
3910 (_("\nThere are undocumented %s specific options as well.\n"),
3914 printf (_("\n Options for %s:\n"), description);
3919 printf (" %-23.23s %s\n", option, _(description));
3924 printf (_("\nThere are undocumented %s specific options as well.\n"),
3927 display_target_options ();
3931 display_target_options ()
3934 static bool displayed = false;
3936 /* Avoid double printing for --help --target-help. */
3941 if (ARRAY_SIZE (target_switches) > 1
3942 #ifdef TARGET_OPTIONS
3943 || ARRAY_SIZE (target_options) > 1
3951 printf (_("\nTarget specific options:\n"));
3953 for (i = ARRAY_SIZE (target_switches); i--;)
3955 const char *option = target_switches[i].name;
3956 const char *description = target_switches[i].description;
3958 if (option == NULL || *option == 0)
3960 else if (description == NULL)
3965 printf (_(" -m%-23.23s [undocumented]\n"), option);
3967 else if (*description != 0)
3968 doc += printf (" -m%-23.23s %s\n", option, _(description));
3971 #ifdef TARGET_OPTIONS
3972 for (i = ARRAY_SIZE (target_options); i--;)
3974 const char *option = target_options[i].prefix;
3975 const char *description = target_options[i].description;
3977 if (option == NULL || *option == 0)
3979 else if (description == NULL)
3984 printf (_(" -m%-23.23s [undocumented]\n"), option);
3986 else if (*description != 0)
3987 doc += printf (" -m%-23.23s %s\n", option, _(description));
3993 printf (_("\nThere are undocumented target specific options as well.\n"));
3995 printf (_(" They exist, but they are not documented.\n"));
4000 /* Parse a -d... command line switch. */
4003 decode_d_option (arg)
4012 for (i = 0; i < (int) DFI_MAX; ++i)
4013 dump_file[i].enabled = 1;
4019 flag_print_asm_name = 1;
4022 flag_dump_rtl_in_asm = 1;
4023 flag_print_asm_name = 1;
4026 graph_dump_format = vcg;
4029 rtl_dump_and_exit = 1;
4034 case 'D': /* These are handled by the preprocessor. */
4038 setup_core_dumping();
4043 for (i = 0; i < (int) DFI_MAX; ++i)
4044 if (c == dump_file[i].debug_switch)
4046 dump_file[i].enabled = 1;
4051 warning ("unrecognized gcc debugging option: %c", c);
4056 /* Parse a -f... command line switch. ARG is the value after the -f.
4057 It is safe to access 'ARG - 2' to generate the full switch name.
4058 Return the number of strings consumed. */
4061 decode_f_option (arg)
4065 const char *option_value = NULL;
4067 /* Search for the option in the table of binary f options. */
4068 for (j = ARRAY_SIZE (f_options); j--;)
4070 if (!strcmp (arg, f_options[j].string))
4072 *f_options[j].variable = f_options[j].on_value;
4076 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4077 && ! strcmp (arg + 3, f_options[j].string))
4079 *f_options[j].variable = ! f_options[j].on_value;
4084 if (!strcmp (arg, "fast-math"))
4085 set_fast_math_flags (1);
4086 else if (!strcmp (arg, "no-fast-math"))
4087 set_fast_math_flags (0);
4088 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4089 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4092 read_integral_parameter (option_value, arg - 2,
4094 set_param_value ("max-inline-insns", val);
4095 set_param_value ("max-inline-insns-single", val/2);
4096 set_param_value ("max-inline-insns-auto", val/2);
4097 set_param_value ("max-inline-insns-rtl", val);
4098 if (val/4 < MIN_INLINE_INSNS)
4101 set_param_value ("min-inline-insns", val/4);
4103 set_param_value ("min-inline-insns", 10);
4106 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4108 if (strcmp (option_value, "global-dynamic") == 0)
4109 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4110 else if (strcmp (option_value, "local-dynamic") == 0)
4111 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4112 else if (strcmp (option_value, "initial-exec") == 0)
4113 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4114 else if (strcmp (option_value, "local-exec") == 0)
4115 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4117 warning ("`%s': unknown tls-model option", arg - 2);
4119 #ifdef INSN_SCHEDULING
4120 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4121 fix_sched_param ("verbose", option_value);
4123 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4124 fix_register (option_value, 1, 1);
4125 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4126 fix_register (option_value, 0, 1);
4127 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4128 fix_register (option_value, 0, 0);
4129 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4130 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4131 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4133 = read_integral_parameter (option_value, arg - 2, align_functions);
4134 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4135 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4136 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4138 = read_integral_parameter (option_value, arg - 2, align_labels);
4139 else if ((option_value
4140 = skip_leading_substring (arg, "stack-limit-register=")))
4142 int reg = decode_reg_name (option_value);
4144 error ("unrecognized register name `%s'", option_value);
4146 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4148 else if ((option_value
4149 = skip_leading_substring (arg, "stack-limit-symbol=")))
4152 nm = ggc_strdup (option_value);
4153 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4155 else if ((option_value
4156 = skip_leading_substring (arg, "message-length=")))
4157 output_set_maximum_length
4158 (&global_dc->buffer, read_integral_parameter
4159 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4160 else if ((option_value
4161 = skip_leading_substring (arg, "diagnostics-show-location=")))
4163 if (!strcmp (option_value, "once"))
4164 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4165 else if (!strcmp (option_value, "every-line"))
4166 diagnostic_prefixing_rule (global_dc)
4167 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4169 error ("unrecognized option `%s'", arg - 2);
4171 else if (!strcmp (arg, "no-stack-limit"))
4172 stack_limit_rtx = NULL_RTX;
4173 else if (!strcmp (arg, "preprocessed"))
4174 /* Recognize this switch but do nothing. This prevents warnings
4175 about an unrecognized switch if cpplib has not been linked in. */
4183 /* Parse a -W... command line switch. ARG is the value after the -W.
4184 It is safe to access 'ARG - 2' to generate the full switch name.
4185 Return the number of strings consumed. */
4188 decode_W_option (arg)
4191 const char *option_value = NULL;
4194 /* Search for the option in the table of binary W options. */
4196 for (j = ARRAY_SIZE (W_options); j--;)
4198 if (!strcmp (arg, W_options[j].string))
4200 *W_options[j].variable = W_options[j].on_value;
4204 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4205 && ! strcmp (arg + 3, W_options[j].string))
4207 *W_options[j].variable = ! W_options[j].on_value;
4212 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4213 warning ("-Wid-clash-LEN is no longer supported");
4214 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4216 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4218 warn_larger_than = larger_than_size != -1;
4220 else if (!strcmp (arg, "unused"))
4224 else if (!strcmp (arg, "no-unused"))
4228 else if (!strcmp (arg, "extra"))
4230 /* We save the value of warn_uninitialized, since if they put
4231 -Wuninitialized on the command line, we need to generate a
4232 warning about not using it without also specifying -O. */
4233 if (warn_uninitialized != 1)
4234 warn_uninitialized = 2;
4242 /* Parse a -g... command line switch. ARG is the value after the -g.
4243 It is safe to access 'ARG - 2' to generate the full switch name.
4244 Return the number of strings consumed. */
4247 decode_g_option (arg)
4250 static unsigned level = 0;
4251 /* A lot of code assumes write_symbols == NO_DEBUG if the
4252 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4253 of what debugging type has been selected). This records the
4254 selected type. It is an error to specify more than one
4256 static enum debug_info_type selected_debug_type = NO_DEBUG;
4257 /* Nonzero if debugging format has been explicitly set.
4258 -g and -ggdb don't explicitly set the debugging format so
4259 -gdwarf -g3 is equivalent to -gdwarf3. */
4260 static int type_explicitly_set_p = 0;
4261 /* Indexed by enum debug_info_type. */
4262 static const char *const debug_type_names[] =
4264 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4267 /* The maximum admissible debug level value. */
4268 static const unsigned max_debug_level = 3;
4270 /* Look up ARG in the table. */
4271 for (da = debug_args; da->arg; da++)
4273 const int da_len = strlen (da->arg);
4275 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4277 enum debug_info_type type = da->debug_type;
4278 const char *p = arg + da_len;
4280 if (*p && ! ISDIGIT (*p))
4283 /* A debug flag without a level defaults to level 2.
4284 Note we do not want to call read_integral_parameter
4285 for that case since it will call atoi which
4288 ??? We may want to generalize the interface to
4289 read_integral_parameter to better handle this case
4290 if this case shows up often. */
4292 level = read_integral_parameter (p, 0, max_debug_level + 1);
4294 level = (level == 0) ? 2 : level;
4296 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4298 error ("use -gdwarf -g%d for DWARF v1, level %d",
4301 error ("use -gdwarf-2 for DWARF v2");
4304 if (level > max_debug_level)
4307 ignoring option `%s' due to invalid debug level specification",
4309 level = debug_info_level;
4312 if (type == NO_DEBUG)
4314 type = PREFERRED_DEBUGGING_TYPE;
4316 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4318 #ifdef DWARF2_DEBUGGING_INFO
4319 type = DWARF2_DEBUG;
4321 #ifdef DBX_DEBUGGING_INFO
4328 if (type == NO_DEBUG)
4329 warning ("`%s': unknown or unsupported -g option", arg - 2);
4331 /* Does it conflict with an already selected type? */
4332 if (type_explicitly_set_p
4333 /* -g/-ggdb don't conflict with anything. */
4334 && da->debug_type != NO_DEBUG
4335 && type != selected_debug_type)
4336 warning ("`%s' ignored, conflicts with `-g%s'",
4337 arg - 2, debug_type_names[(int) selected_debug_type]);
4340 /* If the format has already been set, -g/-ggdb
4341 only change the debug level. */
4342 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4343 /* Don't change debugging type. */
4347 selected_debug_type = type;
4348 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4351 write_symbols = (level == 0
4353 : selected_debug_type);
4354 use_gnu_debug_info_extensions = da->use_extensions_p;
4355 debug_info_level = (enum debug_info_level) level;
4368 /* Decode the first argument in the argv as a language-independent option.
4369 Return the number of strings consumed. */
4372 independent_decode_option (argc, argv)
4376 char *arg = argv[0];
4378 if (arg[0] != '-' || arg[1] == 0)
4390 if (!strcmp (arg, "-help"))
4393 exit_after_options = 1;
4396 if (!strcmp (arg, "-target-help"))
4398 display_target_options ();
4399 exit_after_options = 1;
4402 if (!strcmp (arg, "-version"))
4404 print_version (stderr, "");
4405 exit_after_options = 1;
4408 /* Handle '--param <name>=<value>'. */
4409 if (strcmp (arg, "-param") == 0)
4415 error ("-param option missing argument");
4419 /* Get the '<name>=<value>' parameter. */
4421 /* Look for the `='. */
4422 equal = strchr (arg, '=');
4424 error ("invalid --param option: %s", arg);
4429 /* Zero out the `=' sign so that we get two separate strings. */
4431 /* Figure out what value is specified. */
4432 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4433 if (val != INVALID_PARAM_VAL)
4434 set_param_value (arg, val);
4436 error ("invalid parameter value `%s'", equal + 1);
4451 /* Already been treated in main (). Do nothing. */
4455 set_target_switch (arg + 1);
4459 return decode_f_option (arg + 1);
4462 return decode_g_option (arg + 1);
4465 if (!strcmp (arg, "dumpbase"))
4471 dump_base_name = argv[1];
4476 decode_d_option (arg + 1);
4480 if (!strcmp (arg, "pedantic"))
4482 else if (!strcmp (arg, "pedantic-errors"))
4483 flag_pedantic_errors = pedantic = 1;
4484 else if (arg[1] == 0)
4491 if (!strcmp (arg, "quiet"))
4498 if (!strcmp (arg, "version"))
4506 inhibit_warnings = 1;
4515 /* We save the value of warn_uninitialized, since if they put
4516 -Wuninitialized on the command line, we need to generate a
4517 warning about not using it without also specifying -O. */
4518 if (warn_uninitialized != 1)
4519 warn_uninitialized = 2;
4522 return decode_W_option (arg + 1);
4526 if (!strncmp (arg, "aux-info", 8))
4533 aux_info_file_name = argv[1];
4534 flag_gen_aux_info = 1;
4537 else if (arg[8] == '=')
4539 aux_info_file_name = arg + 9;
4540 flag_gen_aux_info = 1;
4545 else if (!strcmp (arg, "auxbase"))
4551 aux_base_name = argv[1];
4555 else if (!strcmp (arg, "auxbase-strip"))
4562 strip_off_ending (argv[1], strlen (argv[1]));
4564 aux_base_name = argv[1];
4579 asm_file_name = argv[1];
4594 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4599 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4603 if (g_switch_val == -1)
4607 g_switch_set = TRUE;
4608 g_switch_value = g_switch_val;
4618 /* Decode -m switches. */
4619 /* Decode the switch -mNAME. */
4622 set_target_switch (name)
4626 int valid_target_option = 0;
4628 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4629 if (!strcmp (target_switches[j].name, name))
4631 if (target_switches[j].value < 0)
4632 target_flags &= ~-target_switches[j].value;
4634 target_flags |= target_switches[j].value;
4637 if (target_switches[j].value < 0)
4638 target_flags_explicit |= -target_switches[j].value;
4640 target_flags_explicit |= target_switches[j].value;
4642 valid_target_option = 1;
4645 #ifdef TARGET_OPTIONS
4646 if (!valid_target_option)
4647 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4649 int len = strlen (target_options[j].prefix);
4650 if (!strncmp (target_options[j].prefix, name, len))
4652 *target_options[j].variable = name + len;
4653 valid_target_option = 1;
4658 if (!valid_target_option)
4659 error ("invalid option `%s'", name);
4662 /* Print version information to FILE.
4663 Each line begins with INDENT (for the case where FILE is the
4664 assembler output file). */
4667 print_version (file, indent)
4672 #define __VERSION__ "[?]"
4676 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4678 "%s%s%s version %s (%s) compiled by CC.\n"
4680 , indent, *indent != 0 ? " " : "",
4681 lang_hooks.name, version_string, TARGET_NAME,
4682 indent, __VERSION__);
4683 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4684 indent, *indent != 0 ? " " : "",
4685 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4688 /* Print an option value and return the adjusted position in the line.
4689 ??? We don't handle error returns from fprintf (disk full); presumably
4690 other code will catch a disk full though. */
4693 print_single_switch (file, pos, max, indent, sep, term, type, name)
4696 const char *indent, *sep, *term, *type, *name;
4698 /* The ultrix fprintf returns 0 on success, so compute the result we want
4699 here since we need it for the following test. */
4700 int len = strlen (sep) + strlen (type) + strlen (name);
4705 fprintf (file, "%s", term);
4710 fprintf (file, "%s", indent);
4711 pos = strlen (indent);
4713 fprintf (file, "%s%s%s", sep, type, name);
4718 /* Print active target switches to FILE.
4719 POS is the current cursor position and MAX is the size of a "line".
4720 Each line begins with INDENT and ends with TERM.
4721 Each switch is separated from the next by SEP. */
4724 print_switch_values (file, pos, max, indent, sep, term)
4727 const char *indent, *sep, *term;
4732 /* Print the options as passed. */
4734 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4735 _("options passed: "), "");
4737 for (p = &save_argv[1]; *p != NULL; p++)
4741 if (strcmp (*p, "-o") == 0)
4747 if (strcmp (*p, "-quiet") == 0)
4749 if (strcmp (*p, "-version") == 0)
4754 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4757 fprintf (file, "%s", term);
4759 /* Print the -f and -m options that have been enabled.
4760 We don't handle language specific options but printing argv
4763 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4764 _("options enabled: "), "");
4766 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4767 if (*f_options[j].variable == f_options[j].on_value)
4768 pos = print_single_switch (file, pos, max, indent, sep, term,
4769 "-f", f_options[j].string);
4771 /* Print target specific options. */
4773 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4774 if (target_switches[j].name[0] != '\0'
4775 && target_switches[j].value > 0
4776 && ((target_switches[j].value & target_flags)
4777 == target_switches[j].value))
4779 pos = print_single_switch (file, pos, max, indent, sep, term,
4780 "-m", target_switches[j].name);
4783 #ifdef TARGET_OPTIONS
4784 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4785 if (*target_options[j].variable != NULL)
4788 sprintf (prefix, "-m%s", target_options[j].prefix);
4789 pos = print_single_switch (file, pos, max, indent, sep, term,
4790 prefix, *target_options[j].variable);
4794 fprintf (file, "%s", term);
4797 /* Open assembly code output file. Do this even if -fsyntax-only is
4798 on, because then the driver will have provided the name of a
4799 temporary file or bit bucket for us. NAME is the file specified on
4800 the command line, possibly NULL. */
4802 init_asm_output (name)
4805 if (name == NULL && asm_file_name == 0)
4806 asm_out_file = stdout;
4809 if (asm_file_name == 0)
4811 int len = strlen (dump_base_name);
4812 char *dumpname = (char *) xmalloc (len + 6);
4813 memcpy (dumpname, dump_base_name, len + 1);
4814 strip_off_ending (dumpname, len);
4815 strcat (dumpname, ".s");
4816 asm_file_name = dumpname;
4818 if (!strcmp (asm_file_name, "-"))
4819 asm_out_file = stdout;
4821 asm_out_file = fopen (asm_file_name, "w+");
4822 if (asm_out_file == 0)
4823 fatal_io_error ("can't open %s for writing", asm_file_name);
4826 #ifdef IO_BUFFER_SIZE
4827 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4828 _IOFBF, IO_BUFFER_SIZE);
4831 if (!flag_syntax_only)
4833 #ifdef ASM_FILE_START
4834 ASM_FILE_START (asm_out_file);
4837 #ifdef ASM_COMMENT_START
4838 if (flag_verbose_asm)
4840 /* Print the list of options in effect. */
4841 print_version (asm_out_file, ASM_COMMENT_START);
4842 print_switch_values (asm_out_file, 0, MAX_LINE,
4843 ASM_COMMENT_START, " ", "\n");
4844 /* Add a blank line here so it appears in assembler output but not
4846 fprintf (asm_out_file, "\n");
4852 /* Initialization of the front end environment, before command line
4853 options are parsed. Signal handlers, internationalization etc.
4854 ARGV0 is main's argv[0]. */
4856 general_init (argv0)
4861 p = argv0 + strlen (argv0);
4862 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4866 xmalloc_set_program_name (progname);
4870 gcc_init_libintl ();
4872 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4874 signal (SIGSEGV, crash_signal);
4877 signal (SIGILL, crash_signal);
4880 signal (SIGBUS, crash_signal);
4883 signal (SIGABRT, crash_signal);
4885 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4886 signal (SIGIOT, crash_signal);
4889 signal (SIGFPE, crash_signal);
4892 /* Other host-specific signal setup. */
4893 (*host_hooks.extra_signals)();
4895 /* Initialize the diagnostics reporting machinery, so option parsing
4896 can give warnings and errors. */
4897 diagnostic_initialize (global_dc);
4899 /* Initialize the garbage-collector, string pools and tree type hash
4906 /* Parse command line options and set default flag values, called
4907 after language-independent option-independent initialization. Do
4908 minimal options processing. Outputting diagnostics is OK, but GC
4909 and identifier hashtables etc. are not initialized yet.
4911 Return nonzero to suppress compiler back end initialization. */
4913 parse_options_and_default_flags (argc, argv)
4919 /* Save in case md file wants to emit args as a comment. */
4923 /* Initialize register usage now so switches may override. */
4926 /* Register the language-independent parameters. */
4927 add_params (lang_independent_params, LAST_PARAM);
4929 /* This must be done after add_params but before argument processing. */
4930 init_ggc_heuristics();
4932 /* Perform language-specific options initialization. */
4933 (*lang_hooks.init_options) ();
4935 /* Scan to see what optimization level has been specified. That will
4936 determine the default value of many flags. */
4937 for (i = 1; i < argc; i++)
4939 if (!strcmp (argv[i], "-O"))
4944 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4946 /* Handle -Os, -O2, -O3, -O69, ... */
4947 char *p = &argv[i][2];
4949 if ((p[0] == 's') && (p[1] == 0))
4953 /* Optimizing for size forces optimize to be 2. */
4958 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4959 if (optimize_val != -1)
4961 optimize = optimize_val;
4970 flag_merge_constants = 0;
4976 flag_thread_jumps = 1;
4978 flag_delayed_branch = 1;
4980 #ifdef CAN_DEBUG_WITHOUT_FP
4981 flag_omit_frame_pointer = 1;
4983 flag_guess_branch_prob = 1;
4984 flag_cprop_registers = 1;
4985 flag_loop_optimize = 1;
4986 flag_crossjumping = 1;
4987 flag_if_conversion = 1;
4988 flag_if_conversion2 = 1;
4993 flag_optimize_sibling_calls = 1;
4994 flag_cse_follow_jumps = 1;
4995 flag_cse_skip_blocks = 1;
4997 flag_expensive_optimizations = 1;
4998 flag_strength_reduce = 1;
4999 flag_rerun_cse_after_loop = 1;
5000 flag_rerun_loop_opt = 1;
5001 flag_caller_saves = 1;
5004 #ifdef INSN_SCHEDULING
5005 flag_schedule_insns = 1;
5006 flag_schedule_insns_after_reload = 1;
5009 flag_strict_aliasing = 1;
5010 flag_delete_null_pointer_checks = 1;
5011 flag_reorder_blocks = 1;
5012 flag_reorder_functions = 1;
5017 flag_inline_functions = 1;
5018 flag_rename_registers = 1;
5019 flag_unswitch_loops = 1;
5022 if (optimize < 2 || optimize_size)
5027 align_functions = 1;
5029 /* Don't reorder blocks when optimizing for size because extra
5030 jump insns may be created; also barrier may create extra padding.
5032 More correctly we should have a block reordering mode that tried
5033 to minimize the combined size of all the jumps. This would more
5034 or less automatically remove extra jumps, but would also try to
5035 use more short jumps instead of long jumps. */
5036 flag_reorder_blocks = 0;
5039 /* Initialize whether `char' is signed. */
5040 flag_signed_char = DEFAULT_SIGNED_CHAR;
5041 #ifdef DEFAULT_SHORT_ENUMS
5042 /* Initialize how much space enums occupy, by default. */
5043 flag_short_enums = DEFAULT_SHORT_ENUMS;
5046 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5049 set_target_switch ("");
5051 /* Unwind tables are always present in an ABI-conformant IA-64
5052 object file, so the default should be ON. */
5053 #ifdef IA64_UNWIND_INFO
5054 flag_unwind_tables = IA64_UNWIND_INFO;
5057 #ifdef OPTIMIZATION_OPTIONS
5058 /* Allow default optimizations to be specified on a per-machine basis. */
5059 OPTIMIZATION_OPTIONS (optimize, optimize_size);
5062 /* Perform normal command line switch decoding. */
5063 for (i = 1; i < argc;)
5066 int indep_processed;
5068 /* Give the language a chance to decode the option for itself. */
5069 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
5071 if (lang_processed >= 0)
5072 /* Now see if the option also has a language independent meaning.
5073 Some options are both language specific and language independent,
5075 indep_processed = independent_decode_option (argc - i, argv + i);
5078 lang_processed = -lang_processed;
5079 indep_processed = 0;
5082 if (lang_processed || indep_processed)
5083 i += MAX (lang_processed, indep_processed);
5086 const char *option = NULL;
5087 const char *lang = NULL;
5090 /* It is possible that the command line switch is not valid for the
5091 current language, but it is valid for another language. In order
5092 to be compatible with previous versions of the compiler (which
5093 did not issue an error message in this case) we check for this
5094 possibility here. If we do find a match, then if extra_warnings
5095 is set we generate a warning message, otherwise we will just
5096 ignore the option. */
5097 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5099 option = documented_lang_options[j].option;
5102 lang = documented_lang_options[j].description;
5103 else if (! strncmp (argv[i], option, strlen (option)))
5107 if (j != ARRAY_SIZE (documented_lang_options))
5111 warning ("ignoring command line option '%s'", argv[i]);
5114 ("(it is valid for %s but not the selected language)",
5118 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5119 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5121 error ("unrecognized option `%s'", argv[i]);
5127 if (flag_no_inline == 2)
5130 flag_really_no_inline = flag_no_inline;
5132 /* Set flag_no_inline before the post_options () hook. The C front
5133 ends use it to determine tree inlining defaults. FIXME: such
5134 code should be lang-independent when all front ends use tree
5135 inlining, in which case it, and this condition, should be moved
5136 to the top of process_options() instead. */
5139 /* Inlining does not work if not optimizing,
5140 so force it not to be done. */
5144 /* The c_decode_option function and decode_option hook set
5145 this to `2' if -Wall is used, so we can avoid giving out
5146 lots of errors for people who don't realize what -Wall does. */
5147 if (warn_uninitialized == 1)
5148 warning ("-Wuninitialized is not supported without -O");
5151 if (flag_really_no_inline == 2)
5152 flag_really_no_inline = flag_no_inline;
5155 /* Process the options that have been parsed. */
5159 #ifdef OVERRIDE_OPTIONS
5160 /* Some machines may reject certain combinations of options. */
5164 /* Set aux_base_name if not already set. */
5169 char *name = xstrdup (lbasename (filename));
5171 strip_off_ending (name, strlen (name));
5172 aux_base_name = name;
5175 aux_base_name = "gccaux";
5177 /* Set up the align_*_log variables, defaulting them to 1 if they
5178 were still unset. */
5179 if (align_loops <= 0) align_loops = 1;
5180 if (align_loops_max_skip > align_loops || !align_loops)
5181 align_loops_max_skip = align_loops - 1;
5182 align_loops_log = floor_log2 (align_loops * 2 - 1);
5183 if (align_jumps <= 0) align_jumps = 1;
5184 if (align_jumps_max_skip > align_jumps || !align_jumps)
5185 align_jumps_max_skip = align_jumps - 1;
5186 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5187 if (align_labels <= 0) align_labels = 1;
5188 align_labels_log = floor_log2 (align_labels * 2 - 1);
5189 if (align_labels_max_skip > align_labels || !align_labels)
5190 align_labels_max_skip = align_labels - 1;
5191 if (align_functions <= 0) align_functions = 1;
5192 align_functions_log = floor_log2 (align_functions * 2 - 1);
5194 /* Unrolling all loops implies that standard loop unrolling must also
5196 if (flag_unroll_all_loops)
5197 flag_unroll_loops = 1;
5199 if (flag_unroll_loops)
5201 flag_old_unroll_loops = 0;
5202 flag_old_unroll_all_loops = 0;
5205 if (flag_old_unroll_all_loops)
5206 flag_old_unroll_loops = 1;
5208 /* Old loop unrolling requires that strength_reduction be on also. Silently
5209 turn on strength reduction here if it isn't already on. Also, the loop
5210 unrolling code assumes that cse will be run after loop, so that must
5211 be turned on also. */
5212 if (flag_old_unroll_loops)
5214 flag_strength_reduce = 1;
5215 flag_rerun_cse_after_loop = 1;
5217 if (flag_unroll_loops || flag_peel_loops)
5218 flag_rerun_cse_after_loop = 1;
5220 if (flag_non_call_exceptions)
5221 flag_asynchronous_unwind_tables = 1;
5222 if (flag_asynchronous_unwind_tables)
5223 flag_unwind_tables = 1;
5225 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5227 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
5228 flag_unit_at_a_time = 0;
5230 /* Warn about options that are not supported on this machine. */
5231 #ifndef INSN_SCHEDULING
5232 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5233 warning ("instruction scheduling not supported on this target machine");
5236 if (flag_delayed_branch)
5237 warning ("this target machine does not have delayed branches");
5240 user_label_prefix = USER_LABEL_PREFIX;
5241 if (flag_leading_underscore != -1)
5243 /* If the default prefix is more complicated than "" or "_",
5244 issue a warning and ignore this option. */
5245 if (user_label_prefix[0] == 0 ||
5246 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5248 user_label_prefix = flag_leading_underscore ? "_" : "";
5251 warning ("-f%sleading-underscore not supported on this target machine",
5252 flag_leading_underscore ? "" : "no-");
5255 /* If we are in verbose mode, write out the version and maybe all the
5256 option flags in use. */
5259 print_version (stderr, "");
5261 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5264 if (! quiet_flag || flag_detailed_statistics)
5267 if (flag_syntax_only)
5269 write_symbols = NO_DEBUG;
5273 /* Now we know write_symbols, set up the debug hooks based on it.
5274 By default we do nothing for debug output. */
5275 #if defined(DBX_DEBUGGING_INFO)
5276 if (write_symbols == DBX_DEBUG)
5277 debug_hooks = &dbx_debug_hooks;
5279 #if defined(XCOFF_DEBUGGING_INFO)
5280 if (write_symbols == XCOFF_DEBUG)
5281 debug_hooks = &xcoff_debug_hooks;
5283 #ifdef SDB_DEBUGGING_INFO
5284 if (write_symbols == SDB_DEBUG)
5285 debug_hooks = &sdb_debug_hooks;
5287 #ifdef DWARF_DEBUGGING_INFO
5288 if (write_symbols == DWARF_DEBUG)
5289 debug_hooks = &dwarf_debug_hooks;
5291 #ifdef DWARF2_DEBUGGING_INFO
5292 if (write_symbols == DWARF2_DEBUG)
5293 debug_hooks = &dwarf2_debug_hooks;
5295 #ifdef VMS_DEBUGGING_INFO
5296 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5297 debug_hooks = &vmsdbg_debug_hooks;
5300 /* If auxiliary info generation is desired, open the output file.
5301 This goes in the same directory as the source file--unlike
5302 all the other output files. */
5303 if (flag_gen_aux_info)
5305 aux_info_file = fopen (aux_info_file_name, "w");
5306 if (aux_info_file == 0)
5307 fatal_io_error ("can't open %s", aux_info_file_name);
5310 if (! targetm.have_named_sections)
5312 if (flag_function_sections)
5314 warning ("-ffunction-sections not supported for this target");
5315 flag_function_sections = 0;
5317 if (flag_data_sections)
5319 warning ("-fdata-sections not supported for this target");
5320 flag_data_sections = 0;
5324 if (flag_function_sections && profile_flag)
5326 warning ("-ffunction-sections disabled; it makes profiling impossible");
5327 flag_function_sections = 0;
5330 #ifndef HAVE_prefetch
5331 if (flag_prefetch_loop_arrays)
5333 warning ("-fprefetch-loop-arrays not supported for this target");
5334 flag_prefetch_loop_arrays = 0;
5337 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5339 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5340 flag_prefetch_loop_arrays = 0;
5344 /* This combination of options isn't handled for i386 targets and doesn't
5345 make much sense anyway, so don't allow it. */
5346 if (flag_prefetch_loop_arrays && optimize_size)
5348 warning ("-fprefetch-loop-arrays is not supported with -Os");
5349 flag_prefetch_loop_arrays = 0;
5352 #ifndef OBJECT_FORMAT_ELF
5353 if (flag_function_sections && write_symbols != NO_DEBUG)
5354 warning ("-ffunction-sections may affect debugging on some targets");
5357 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5358 if (flag_signaling_nans)
5359 flag_trapping_math = 1;
5362 /* Initialize the compiler back end. */
5366 /* init_emit_once uses reg_raw_mode and therefore must be called
5367 after init_regs which initialized reg_raw_mode. */
5369 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5370 || debug_info_level == DINFO_LEVEL_VERBOSE
5371 #ifdef VMS_DEBUGGING_INFO
5372 /* Enable line number info for traceback */
5373 || debug_info_level > DINFO_LEVEL_NONE
5375 || flag_test_coverage
5376 || warn_notreached);
5377 init_fake_stack_mems ();
5381 init_function_once ();
5382 init_varasm_once ();
5384 /* The following initialization functions need to generate rtl, so
5385 provide a dummy function context for them. */
5386 init_dummy_function_start ();
5388 if (flag_caller_saves)
5389 init_caller_save ();
5390 expand_dummy_function_end ();
5393 /* Language-dependent initialization. Returns nonzero on success. */
5395 lang_dependent_init (name)
5398 if (dump_base_name == 0)
5399 dump_base_name = name ? name : "gccdump";
5401 /* Front-end initialization. This hook can assume that GC,
5402 identifier hashes etc. are set up, but debug initialization is
5403 not done yet. This routine must return the original filename
5404 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5405 name = (*lang_hooks.init) (name);
5409 main_input_filename = input_filename = name;
5410 init_asm_output (name);
5412 /* These create various _DECL nodes, so need to be called after the
5413 front end is initialized. */
5417 /* The following initialization functions need to generate rtl, so
5418 provide a dummy function context for them. */
5419 init_dummy_function_start ();
5421 expand_dummy_function_end ();
5423 /* Put an entry on the input file stack for the main input file. */
5424 push_srcloc (input_filename, 0);
5426 /* If dbx symbol table desired, initialize writing it and output the
5427 predefined types. */
5428 timevar_push (TV_SYMOUT);
5430 #ifdef DWARF2_UNWIND_INFO
5431 if (dwarf2out_do_frame ())
5432 dwarf2out_frame_init ();
5435 /* Now we have the correct original filename, we can initialize
5437 (*debug_hooks->init) (name);
5439 timevar_pop (TV_SYMOUT);
5444 /* Clean up: close opened files, etc. */
5449 /* Close the dump files. */
5450 if (flag_gen_aux_info)
5452 fclose (aux_info_file);
5454 unlink (aux_info_file_name);
5457 /* Close non-debugging input and output files. Take special care to note
5458 whether fclose returns an error, since the pages might still be on the
5459 buffer chain while the file is open. */
5463 if (ferror (asm_out_file) != 0)
5464 fatal_io_error ("error writing to %s", asm_file_name);
5465 if (fclose (asm_out_file) != 0)
5466 fatal_io_error ("error closing %s", asm_file_name);
5469 /* Do whatever is necessary to finish printing the graphs. */
5470 if (graph_dump_format != no_graph)
5474 for (i = 0; i < (int) DFI_MAX; ++i)
5475 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5480 sprintf (seq, DUMPFILE_FORMAT, i);
5481 suffix = concat (seq, dump_file[i].extension, NULL);
5482 finish_graph_dump_file (dump_base_name, suffix);
5489 ggc_print_statistics ();
5490 stringpool_statistics ();
5491 dump_tree_statistics ();
5494 /* Free up memory for the benefit of leak detectors. */
5497 /* Language-specific end of compilation actions. */
5498 (*lang_hooks.finish) ();
5501 /* Initialize the compiler, and compile the input file. */
5503 do_compile (no_backend)
5506 /* We cannot start timing until after options are processed since that
5507 says if we run timers or not. */
5509 timevar_start (TV_TOTAL);
5511 /* Set up the back-end if requested. */
5515 /* Language-dependent initialization. Returns true on success. */
5516 if (lang_dependent_init (filename))
5521 /* Stop timing and print the times. */
5522 timevar_stop (TV_TOTAL);
5523 timevar_print (stderr);
5526 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5527 Decode command args, then call compile_file.
5528 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5529 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5531 It is not safe to call this function more than once. */
5534 toplev_main (argc, argv)
5538 /* Initialization of GCC's environment, and diagnostics. */
5539 general_init (argv[0]);
5541 /* Parse the options and do minimal processing; basically just
5542 enough to default flags appropriately. */
5543 parse_options_and_default_flags (argc, argv);
5545 /* Exit early if we can (e.g. -help). */
5546 if (!exit_after_options)
5548 /* All command line options have been parsed; allow the front
5549 end to perform consistency checks, etc. */
5550 bool no_backend = (*lang_hooks.post_options) ();
5552 /* The bulk of command line switch processing. */
5555 /* Don't do any more if an error has already occurred. */
5557 do_compile (no_backend);
5560 if (errorcount || sorrycount)
5561 return (FATAL_EXIT_CODE);
5563 return (SUCCESS_EXIT_CODE);