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 ((void));
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 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 { "sched2", 'R', 1, 0, 0 },
309 { "stack", 'k', 1, 0, 0 },
310 { "bbro", 'B', 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 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 generating code to do profiling. */
383 int profile_flag = 0;
385 /* Nonzero if generating code to profile program flow graph arcs. */
387 int profile_arc_flag = 0;
389 /* Nonzero if generating info for gcov to calculate line test coverage. */
391 int flag_test_coverage = 0;
393 /* Nonzero indicates that branch taken probabilities should be calculated. */
395 int flag_branch_probabilities = 0;
397 /* Nonzero if basic blocks should be reordered. */
399 int flag_reorder_blocks = 0;
401 /* Nonzero if functions should be reordered. */
403 int flag_reorder_functions = 0;
405 /* Nonzero if registers should be renamed. */
407 int flag_rename_registers = 0;
408 int flag_cprop_registers = 0;
410 /* Nonzero for -pedantic switch: warn about anything
411 that standard spec forbids. */
415 /* Temporarily suppress certain warnings.
416 This is set while reading code from a system header file. */
418 int in_system_header = 0;
420 /* Don't print functions as they are compiled. -quiet. */
424 /* Print times taken by the various passes. -ftime-report. */
428 /* Print memory still in use at end of compilation (which may have little
429 to do with peak memory consumption). -fmem-report. */
433 /* Nonzero means to collect statistics which might be expensive
434 and to print them when we are done. */
435 int flag_detailed_statistics = 0;
440 /* Nonzero means `char' should be signed. */
442 int flag_signed_char;
444 /* Nonzero means give an enum type only as many bytes as it needs. */
446 int flag_short_enums;
448 /* Nonzero for -fcaller-saves: allocate values in regs that need to
449 be saved across function calls, if that produces overall better code.
450 Optional now, so people can test it. */
452 #ifdef DEFAULT_CALLER_SAVES
453 int flag_caller_saves = 1;
455 int flag_caller_saves = 0;
458 /* Nonzero if structures and unions should be returned in memory.
460 This should only be defined if compatibility with another compiler or
461 with an ABI is needed, because it results in slower code. */
463 #ifndef DEFAULT_PCC_STRUCT_RETURN
464 #define DEFAULT_PCC_STRUCT_RETURN 1
467 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
469 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
471 /* Nonzero for -fforce-mem: load memory value into a register
472 before arithmetic on it. This makes better cse but slower compilation. */
474 int flag_force_mem = 0;
476 /* Nonzero for -fforce-addr: load memory address into a register before
477 reference to memory. This makes better cse but slower compilation. */
479 int flag_force_addr = 0;
481 /* Nonzero for -fdefer-pop: don't pop args after each function call;
482 instead save them up to pop many calls' args with one insns. */
484 int flag_defer_pop = 0;
486 /* Nonzero for -ffloat-store: don't allocate floats and doubles
487 in extended-precision registers. */
489 int flag_float_store = 0;
491 /* Nonzero for -fcse-follow-jumps:
492 have cse follow jumps to do a more extensive job. */
494 int flag_cse_follow_jumps;
496 /* Nonzero for -fcse-skip-blocks:
497 have cse follow a branch around a block. */
498 int flag_cse_skip_blocks;
500 /* Nonzero for -fexpensive-optimizations:
501 perform miscellaneous relatively-expensive optimizations. */
502 int flag_expensive_optimizations;
504 /* Nonzero for -fthread-jumps:
505 have jump optimize output of loop. */
507 int flag_thread_jumps;
509 /* Nonzero enables strength-reduction in loop.c. */
511 int flag_strength_reduce = 0;
513 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
514 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
515 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
518 int flag_unroll_loops;
520 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
521 This is generally not a win. */
523 int flag_unroll_all_loops;
525 /* Nonzero enables loop unswitching. */
526 int flag_unswitch_loops;
528 /* Nonzero enables prefetch optimizations for arrays in loops. */
530 int flag_prefetch_loop_arrays;
532 /* Nonzero forces all invariant computations in loops to be moved
535 int flag_move_all_movables = 0;
537 /* Nonzero forces all general induction variables in loops to be
540 int flag_reduce_all_givs = 0;
542 /* Nonzero to perform full register move optimization passes. This is the
545 int flag_regmove = 0;
547 /* Nonzero for -fwritable-strings:
548 store string constants in data segment and don't uniquize them. */
550 int flag_writable_strings = 0;
552 /* Nonzero means don't put addresses of constant functions in registers.
553 Used for compiling the Unix kernel, where strange substitutions are
554 done on the assembly output. */
556 int flag_no_function_cse = 0;
558 /* Nonzero for -fomit-frame-pointer:
559 don't make a frame pointer in simple functions that don't require one. */
561 int flag_omit_frame_pointer = 0;
563 /* Nonzero means place each function into its own section on those platforms
564 which support arbitrary section names and unlimited numbers of sections. */
566 int flag_function_sections = 0;
568 /* ... and similar for data. */
570 int flag_data_sections = 0;
572 /* Nonzero to inhibit use of define_optimization peephole opts. */
574 int flag_no_peephole = 0;
576 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
578 int flag_optimize_sibling_calls = 0;
580 /* Nonzero means the front end generally wants `errno' maintained by math
581 operations, like built-in SQRT. */
583 int flag_errno_math = 1;
585 /* Nonzero means that unsafe floating-point math optimizations are allowed
586 for the sake of speed. IEEE compliance is not guaranteed, and operations
587 are allowed to assume that their arguments and results are "normal"
588 (e.g., nonnegative for SQRT). */
590 int flag_unsafe_math_optimizations = 0;
592 /* Nonzero means that no NaNs or +-Infs are expected. */
594 int flag_finite_math_only = 0;
596 /* Zero means that floating-point math operations cannot generate a
597 (user-visible) trap. This is the case, for example, in nonstop
598 IEEE 754 arithmetic. Trapping conditions include division by zero,
599 overflow, underflow, invalid and inexact, but does not include
600 operations on signaling NaNs (see below). */
602 int flag_trapping_math = 1;
604 /* Nonzero means disable transformations observable by signaling NaNs.
605 This option implies that any operation on a IEEE signaling NaN can
606 generate a (user-visible) trap. */
608 int flag_signaling_nans = 0;
610 /* 0 means straightforward implementation of complex divide acceptable.
611 1 means wide ranges of inputs must work for complex divide.
612 2 means C99-like requirements for complex divide (not yet implemented). */
614 int flag_complex_divide_method = 0;
616 /* Nonzero means just do syntax checking; don't output anything. */
618 int flag_syntax_only = 0;
620 /* Nonzero means perform loop optimizer. */
622 static int flag_loop_optimize;
624 /* Nonzero means perform crossjumping. */
626 static int flag_crossjumping;
628 /* Nonzero means perform if conversion. */
630 static int flag_if_conversion;
632 /* Nonzero means perform if conversion after reload. */
634 static int flag_if_conversion2;
636 /* Nonzero means to use global dataflow analysis to eliminate
637 useless null pointer tests. */
639 static int flag_delete_null_pointer_checks;
641 /* Nonzero means perform global CSE. */
645 /* Nonzero means to do the enhanced load motion during gcse, which trys
646 to hoist loads by not killing them when a store to the same location
649 int flag_gcse_lm = 1;
651 /* Nonzero means to perform store motion after gcse, which will try to
652 move stores closer to the exit block. Its not very effective without
655 int flag_gcse_sm = 1;
657 /* Nonzero means to rerun cse after loop optimization. This increases
658 compilation time about 20% and picks up a few more common expressions. */
660 static int flag_rerun_cse_after_loop;
662 /* Nonzero means to run loop optimizations twice. */
664 int flag_rerun_loop_opt;
666 /* Nonzero for -finline-functions: ok to inline functions that look like
667 good inline candidates. */
669 int flag_inline_functions;
671 /* Nonzero for -fkeep-inline-functions: even if we make a function
672 go inline everywhere, keep its definition around for debugging
675 int flag_keep_inline_functions;
677 /* Nonzero means that functions will not be inlined. */
679 int flag_no_inline = 2;
681 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
682 not just because the tree inliner turned us off. */
684 int flag_really_no_inline = 2;
686 /* Nonzero means that we should emit static const variables
687 regardless of whether or not optimization is turned on. */
689 int flag_keep_static_consts = 1;
691 /* Nonzero means we should be saving declaration info into a .X file. */
693 int flag_gen_aux_info = 0;
695 /* Specified name of aux-info file. */
697 static char *aux_info_file_name;
699 /* Nonzero means make the text shared if supported. */
701 int flag_shared_data;
703 /* Nonzero means schedule into delayed branch slots if supported. */
705 int flag_delayed_branch;
707 /* Nonzero if we are compiling pure (sharable) code.
708 Value is 1 if we are doing "small" pic; value is 2 if we're doing
713 /* Set to the default thread-local storage (tls) model to use. */
715 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
717 /* Nonzero means generate extra code for exception handling and enable
718 exception handling. */
722 /* Nonzero means generate frame unwind info table when supported. */
724 int flag_unwind_tables = 0;
726 /* Nonzero means generate frame unwind info table exact at each insn boundary */
728 int flag_asynchronous_unwind_tables = 0;
730 /* Nonzero means don't place uninitialized global data in common storage
735 /* Nonzero means change certain warnings into errors.
736 Usually these are warnings about failure to conform to some standard. */
738 int flag_pedantic_errors = 0;
740 /* flag_schedule_insns means schedule insns within basic blocks (before
742 flag_schedule_insns_after_reload means schedule insns after
745 int flag_schedule_insns = 0;
746 int flag_schedule_insns_after_reload = 0;
748 /* The following flags have effect only for scheduling before register
751 flag_schedule_interblock means schedule insns across basic blocks.
752 flag_schedule_speculative means allow speculative motion of non-load insns.
753 flag_schedule_speculative_load means allow speculative motion of some
755 flag_schedule_speculative_load_dangerous allows speculative motion of more
758 int flag_schedule_interblock = 1;
759 int flag_schedule_speculative = 1;
760 int flag_schedule_speculative_load = 0;
761 int flag_schedule_speculative_load_dangerous = 0;
763 int flag_single_precision_constant;
765 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
766 by a cheaper branch on a count register. */
767 int flag_branch_on_count_reg = 1;
769 /* -finhibit-size-directive inhibits output of .size for ELF.
770 This is used only for compiling crtstuff.c,
771 and it may be extended to other effects
772 needed for crtstuff.c on other systems. */
773 int flag_inhibit_size_directive = 0;
775 /* -fverbose-asm causes extra commentary information to be produced in
776 the generated assembly code (to make it more readable). This option
777 is generally only of use to those who actually need to read the
778 generated assembly code (perhaps while debugging the compiler itself).
779 -fno-verbose-asm, the default, causes the extra information
780 to be omitted and is useful when comparing two assembler files. */
782 int flag_verbose_asm = 0;
784 /* -dA causes debug commentary information to be produced in
785 the generated assembly code (to make it more readable). This option
786 is generally only of use to those who actually need to read the
787 generated assembly code (perhaps while debugging the compiler itself).
788 Currently, this switch is only used by dwarfout.c; however, it is intended
789 to be a catchall for printing debug information in the assembler file. */
791 int flag_debug_asm = 0;
793 /* -dP causes the rtl to be emitted as a comment in assembly. */
795 int flag_dump_rtl_in_asm = 0;
797 /* -fgnu-linker specifies use of the GNU linker for initializations.
798 (Or, more generally, a linker that handles initializations.)
799 -fno-gnu-linker says that collect2 will be used. */
801 int flag_gnu_linker = 0;
803 int flag_gnu_linker = 1;
806 /* Nonzero means put zero initialized data in the bss section. */
807 int flag_zero_initialized_in_bss = 1;
812 /* Enable ssa conditional constant propagation. */
813 int flag_ssa_ccp = 0;
815 /* Enable ssa aggressive dead code elimination. */
816 int flag_ssa_dce = 0;
818 /* Tag all structures with __attribute__(packed). */
819 int flag_pack_struct = 0;
821 /* Emit code to check for stack overflow; also may cause large objects
822 to be allocated dynamically. */
823 int flag_stack_check;
825 /* When non-NULL, indicates that whenever space is allocated on the
826 stack, the resulting stack pointer must not pass this
827 address---that is, for stacks that grow downward, the stack pointer
828 must always be greater than or equal to this address; for stacks
829 that grow upward, the stack pointer must be less than this address.
830 At present, the rtx may be either a REG or a SYMBOL_REF, although
831 the support provided depends on the backend. */
834 /* 0 if pointer arguments may alias each other. True in C.
835 1 if pointer arguments may not alias each other but may alias
837 2 if pointer arguments may not alias each other and may not
838 alias global variables. True in Fortran.
839 This defaults to 0 for C. */
840 int flag_argument_noalias = 0;
842 /* Nonzero if we should do (language-dependent) alias analysis.
843 Typically, this analysis will assume that expressions of certain
844 types do not alias expressions of certain other types. Only used
845 if alias analysis (in general) is enabled. */
846 int flag_strict_aliasing = 0;
848 /* Instrument functions with calls at entry and exit, for profiling. */
849 int flag_instrument_function_entry_exit = 0;
851 /* Nonzero means ignore `#ident' directives. 0 means handle them.
852 On SVR4 targets, it also controls whether or not to emit a
853 string identifying the compiler. */
855 int flag_no_ident = 0;
857 /* This will perform a peephole pass before sched2. */
858 int flag_peephole2 = 0;
860 /* This will try to guess branch probabilities. */
861 int flag_guess_branch_prob = 0;
863 /* -fcheck-bounds causes gcc to generate array bounds checks.
864 For C, C++, ObjC: defaults to off.
865 For Java: defaults to on.
866 For Fortran: defaults to off. */
867 int flag_bounds_check = 0;
869 /* This will attempt to merge constant section constants, if 1 only
870 string constants and constants from constant pool, if 2 also constant
872 int flag_merge_constants = 1;
874 /* If one, renumber instruction UIDs to reduce the number of
875 unused UIDs if there are a lot of instructions. If greater than
876 one, unconditionally renumber instruction UIDs. */
877 int flag_renumber_insns = 1;
879 /* If nonzero, use the graph coloring register allocator. */
880 int flag_new_regalloc = 0;
882 /* Nonzero if we perform superblock formation. */
886 /* Values of the -falign-* flags: how much to align labels in code.
887 0 means `use default', 1 means `don't align'.
888 For each variable, there is an _log variant which is the power
889 of two not less than the variable, for .align output. */
893 int align_loops_max_skip;
896 int align_jumps_max_skip;
898 int align_labels_log;
899 int align_labels_max_skip;
901 int align_functions_log;
903 /* Like align_functions_log above, but used by front-ends to force the
904 minimum function alignment. Zero means no alignment is forced. */
905 int force_align_functions_log;
907 /* Table of supported debugging formats. */
910 const char *const arg;
911 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
912 constant expression, we use NO_DEBUG in its place. */
913 const enum debug_info_type debug_type;
914 const int use_extensions_p;
915 const char *const description;
919 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
920 N_("Generate debugging info in default format") },
921 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
922 #ifdef DBX_DEBUGGING_INFO
923 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
924 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
926 #ifdef DWARF_DEBUGGING_INFO
927 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
928 { "dwarf+", DWARF_DEBUG, 1,
929 N_("Generate extended DWARF-1 format debug info") },
931 #ifdef DWARF2_DEBUGGING_INFO
932 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
934 #ifdef XCOFF_DEBUGGING_INFO
935 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
936 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
938 #ifdef SDB_DEBUGGING_INFO
939 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
941 #ifdef VMS_DEBUGGING_INFO
942 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
949 const char *const string;
952 const char *const description;
954 lang_independent_options;
958 /* Add or remove a leading underscore from user symbols. */
959 int flag_leading_underscore = -1;
961 /* The user symbol prefix after having resolved same. */
962 const char *user_label_prefix;
964 static const param_info lang_independent_params[] = {
965 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
966 { OPTION, DEFAULT, HELP },
967 #include "params.def"
972 /* Table of language-independent -f options.
973 STRING is the option name. VARIABLE is the address of the variable.
974 ON_VALUE is the value to store in VARIABLE
975 if `-fSTRING' is seen as an option.
976 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
978 static const lang_independent_options f_options[] =
980 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
981 N_("Perform DWARF2 duplicate elimination") },
982 {"float-store", &flag_float_store, 1,
983 N_("Do not store floats in registers") },
984 {"defer-pop", &flag_defer_pop, 1,
985 N_("Defer popping functions args from stack until later") },
986 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
987 N_("When possible do not generate stack frames") },
988 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
989 N_("Optimize sibling and tail recursive calls") },
990 {"tracer", &flag_tracer, 1,
991 N_("Perform superblock formation via tail duplication") },
992 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
993 N_("When running CSE, follow jumps to their targets") },
994 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
995 N_("When running CSE, follow conditional jumps") },
996 {"expensive-optimizations", &flag_expensive_optimizations, 1,
997 N_("Perform a number of minor, expensive optimizations") },
998 {"thread-jumps", &flag_thread_jumps, 1,
999 N_("Perform jump threading optimizations") },
1000 {"strength-reduce", &flag_strength_reduce, 1,
1001 N_("Perform strength reduction optimizations") },
1002 {"unroll-loops", &flag_unroll_loops, 1,
1003 N_("Perform loop unrolling when iteration count is known") },
1004 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1005 N_("Perform loop unrolling for all loops") },
1006 {"unswitch-loops", &flag_unswitch_loops, 1,
1007 N_("Perform loop unswitching") },
1008 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1009 N_("Generate prefetch instructions, if available, for arrays in loops") },
1010 {"move-all-movables", &flag_move_all_movables, 1,
1011 N_("Force all loop invariant computations out of loops") },
1012 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1013 N_("Strength reduce all loop general induction variables") },
1014 {"writable-strings", &flag_writable_strings, 1,
1015 N_("Store strings in writable data section") },
1016 {"peephole", &flag_no_peephole, 0,
1017 N_("Enable machine specific peephole optimizations") },
1018 {"force-mem", &flag_force_mem, 1,
1019 N_("Copy memory operands into registers before using") },
1020 {"force-addr", &flag_force_addr, 1,
1021 N_("Copy memory address constants into regs before using") },
1022 {"function-cse", &flag_no_function_cse, 0,
1023 N_("Allow function addresses to be held in registers") },
1024 {"inline-functions", &flag_inline_functions, 1,
1025 N_("Integrate simple functions into their callers") },
1026 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1027 N_("Generate code for funcs even if they are fully inlined") },
1028 {"inline", &flag_no_inline, 0,
1029 N_("Pay attention to the 'inline' keyword") },
1030 {"keep-static-consts", &flag_keep_static_consts, 1,
1031 N_("Emit static const variables even if they are not used") },
1032 {"syntax-only", &flag_syntax_only, 1,
1033 N_("Check for syntax errors, then stop") },
1034 {"shared-data", &flag_shared_data, 1,
1035 N_("Mark data as shared rather than private") },
1036 {"caller-saves", &flag_caller_saves, 1,
1037 N_("Enable saving registers around function calls") },
1038 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1039 N_("Return 'short' aggregates in memory, not registers") },
1040 {"reg-struct-return", &flag_pcc_struct_return, 0,
1041 N_("Return 'short' aggregates in registers") },
1042 {"delayed-branch", &flag_delayed_branch, 1,
1043 N_("Attempt to fill delay slots of branch instructions") },
1044 {"gcse", &flag_gcse, 1,
1045 N_("Perform the global common subexpression elimination") },
1046 {"gcse-lm", &flag_gcse_lm, 1,
1047 N_("Perform enhanced load motion during global subexpression elimination") },
1048 {"gcse-sm", &flag_gcse_sm, 1,
1049 N_("Perform store motion after global subexpression elimination") },
1050 {"loop-optimize", &flag_loop_optimize, 1,
1051 N_("Perform the loop optimizations") },
1052 {"crossjumping", &flag_crossjumping, 1,
1053 N_("Perform cross-jumping optimization") },
1054 {"if-conversion", &flag_if_conversion, 1,
1055 N_("Perform conversion of conditional jumps to branchless equivalents") },
1056 {"if-conversion2", &flag_if_conversion2, 1,
1057 N_("Perform conversion of conditional jumps to conditional execution") },
1058 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1059 N_("Run CSE pass after loop optimizations") },
1060 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1061 N_("Run the loop optimizer twice") },
1062 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1063 N_("Delete useless null pointer checks") },
1064 {"schedule-insns", &flag_schedule_insns, 1,
1065 N_("Reschedule instructions before register allocation") },
1066 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1067 N_("Reschedule instructions after register allocation") },
1068 {"sched-interblock",&flag_schedule_interblock, 1,
1069 N_("Enable scheduling across basic blocks") },
1070 {"sched-spec",&flag_schedule_speculative, 1,
1071 N_("Allow speculative motion of non-loads") },
1072 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1073 N_("Allow speculative motion of some loads") },
1074 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1075 N_("Allow speculative motion of more loads") },
1076 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1077 N_("Replace add,compare,branch with branch on count reg") },
1078 {"pic", &flag_pic, 1,
1079 N_("Generate position independent code, if possible") },
1080 {"PIC", &flag_pic, 2, ""},
1081 {"exceptions", &flag_exceptions, 1,
1082 N_("Enable exception handling") },
1083 {"unwind-tables", &flag_unwind_tables, 1,
1084 N_("Just generate unwind tables for exception handling") },
1085 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1086 N_("Generate unwind tables exact at each instruction boundary") },
1087 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1088 N_("Support synchronous non-call exceptions") },
1089 {"profile-arcs", &profile_arc_flag, 1,
1090 N_("Insert arc based program profiling code") },
1091 {"test-coverage", &flag_test_coverage, 1,
1092 N_("Create data files needed by gcov") },
1093 {"branch-probabilities", &flag_branch_probabilities, 1,
1094 N_("Use profiling information for branch probabilities") },
1095 {"profile", &profile_flag, 1,
1096 N_("Enable basic program profiling code") },
1097 {"reorder-blocks", &flag_reorder_blocks, 1,
1098 N_("Reorder basic blocks to improve code placement") },
1099 {"reorder-functions", &flag_reorder_functions, 1,
1100 N_("Reorder functions to improve code placement") },
1101 {"rename-registers", &flag_rename_registers, 1,
1102 N_("Do the register renaming optimization pass") },
1103 {"cprop-registers", &flag_cprop_registers, 1,
1104 N_("Do the register copy-propagation optimization pass") },
1105 {"common", &flag_no_common, 0,
1106 N_("Do not put uninitialized globals in the common section") },
1107 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1108 N_("Do not generate .size directives") },
1109 {"function-sections", &flag_function_sections, 1,
1110 N_("place each function into its own section") },
1111 {"data-sections", &flag_data_sections, 1,
1112 N_("place data items into their own section") },
1113 {"verbose-asm", &flag_verbose_asm, 1,
1114 N_("Add extra commentry to assembler output") },
1115 {"gnu-linker", &flag_gnu_linker, 1,
1116 N_("Output GNU ld formatted global initializers") },
1117 {"regmove", &flag_regmove, 1,
1118 N_("Enables a register move optimization") },
1119 {"optimize-register-move", &flag_regmove, 1,
1120 N_("Do the full regmove optimization pass") },
1121 {"pack-struct", &flag_pack_struct, 1,
1122 N_("Pack structure members together without holes") },
1123 {"stack-check", &flag_stack_check, 1,
1124 N_("Insert stack checking code into the program") },
1125 {"argument-alias", &flag_argument_noalias, 0,
1126 N_("Specify that arguments may alias each other & globals") },
1127 {"argument-noalias", &flag_argument_noalias, 1,
1128 N_("Assume arguments may alias globals but not each other") },
1129 {"argument-noalias-global", &flag_argument_noalias, 2,
1130 N_("Assume arguments do not alias each other or globals") },
1131 {"strict-aliasing", &flag_strict_aliasing, 1,
1132 N_("Assume strict aliasing rules apply") },
1133 {"align-loops", &align_loops, 0,
1134 N_("Align the start of loops") },
1135 {"align-jumps", &align_jumps, 0,
1136 N_("Align labels which are only reached by jumping") },
1137 {"align-labels", &align_labels, 0,
1138 N_("Align all labels") },
1139 {"align-functions", &align_functions, 0,
1140 N_("Align the start of functions") },
1141 {"merge-constants", &flag_merge_constants, 1,
1142 N_("Attempt to merge identical constants accross compilation units") },
1143 {"merge-all-constants", &flag_merge_constants, 2,
1144 N_("Attempt to merge identical constants and constant variables") },
1145 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1146 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1147 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1148 N_("Instrument function entry/exit with profiling calls") },
1149 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1150 N_("Put zero initialized data in the bss section") },
1151 {"ssa", &flag_ssa, 1,
1152 N_("Enable SSA optimizations") },
1153 {"ssa-ccp", &flag_ssa_ccp, 1,
1154 N_("Enable SSA conditional constant propagation") },
1155 {"ssa-dce", &flag_ssa_dce, 1,
1156 N_("Enable aggressive SSA dead code elimination") },
1157 {"leading-underscore", &flag_leading_underscore, 1,
1158 N_("External symbols have a leading underscore") },
1159 {"ident", &flag_no_ident, 0,
1160 N_("Process #ident directives") },
1161 { "peephole2", &flag_peephole2, 1,
1162 N_("Enables an rtl peephole pass run before sched2") },
1163 {"finite-math-only", &flag_finite_math_only, 1,
1164 N_("Assume no NaNs or +-Infs are generated") },
1165 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1166 N_("Enables guessing of branch probabilities") },
1167 {"math-errno", &flag_errno_math, 1,
1168 N_("Set errno after built-in math functions") },
1169 {"trapping-math", &flag_trapping_math, 1,
1170 N_("Floating-point operations can trap") },
1171 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1172 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1173 {"signaling-nans", &flag_signaling_nans, 1,
1174 N_("Disable optimizations observable by IEEE signaling NaNs") },
1175 {"bounds-check", &flag_bounds_check, 1,
1176 N_("Generate code to check bounds before indexing arrays") },
1177 {"single-precision-constant", &flag_single_precision_constant, 1,
1178 N_("Convert floating point constant to single precision constant") },
1179 {"time-report", &time_report, 1,
1180 N_("Report time taken by each compiler pass at end of run") },
1181 {"mem-report", &mem_report, 1,
1182 N_("Report on permanent memory allocation at end of run") },
1183 { "trapv", &flag_trapv, 1,
1184 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1185 { "new-ra", &flag_new_regalloc, 1,
1186 N_("Use graph coloring register allocation.") },
1189 /* Table of language-specific options. */
1191 static const struct lang_opt
1193 const char *const option;
1194 const char *const description;
1196 documented_lang_options[] =
1198 /* In order not to overload the --help output, the convention
1199 used here is to only describe those options which are not
1200 enabled by default. */
1203 N_("Compile just for ISO C90") },
1205 N_("Determine language standard") },
1207 { "-fsigned-bitfields", "" },
1208 { "-funsigned-bitfields",
1209 N_("Make bit-fields by unsigned by default") },
1210 { "-fno-signed-bitfields", "" },
1211 { "-fno-unsigned-bitfields","" },
1213 N_("Make 'char' be signed by default") },
1214 { "-funsigned-char",
1215 N_("Make 'char' be unsigned by default") },
1216 { "-fno-signed-char", "" },
1217 { "-fno-unsigned-char", "" },
1221 N_("Do not recognize the 'asm' keyword") },
1222 { "-fbuiltin", "" },
1224 N_("Do not recognize any built in functions") },
1226 N_("Assume normal C execution environment") },
1227 { "-fno-hosted", "" },
1229 N_("Assume that standard libraries & main might not exist") },
1230 { "-fno-freestanding", "" },
1231 { "-fcond-mismatch",
1232 N_("Allow different types as args of ? operator") },
1233 { "-fno-cond-mismatch", "" },
1234 { "-fdollars-in-identifiers",
1235 N_("Allow the use of $ inside identifiers") },
1236 { "-fno-dollars-in-identifiers", "" },
1237 { "-fpreprocessed", "" },
1238 { "-fno-preprocessed", "" },
1240 N_("Use the same size for double as for float") },
1241 { "-fno-short-double", "" },
1243 N_("Use the smallest fitting integer to hold enums") },
1244 { "-fno-short-enums", "" },
1246 N_("Override the underlying type for wchar_t to `unsigned short'") },
1247 { "-fno-short-wchar", "" },
1250 N_("Enable most warning messages") },
1251 { "-Wbad-function-cast",
1252 N_("Warn about casting functions to incompatible types") },
1253 { "-Wno-bad-function-cast", "" },
1254 { "-Wmissing-format-attribute",
1255 N_("Warn about functions which might be candidates for format attributes") },
1256 { "-Wno-missing-format-attribute", "" },
1258 N_("Warn about casts which discard qualifiers") },
1259 { "-Wno-cast-qual", "" },
1260 { "-Wchar-subscripts",
1261 N_("Warn about subscripts whose type is 'char'") },
1262 { "-Wno-char-subscripts", "" },
1264 N_("Warn if nested comments are detected") },
1265 { "-Wno-comment", "" },
1267 N_("Warn if nested comments are detected") },
1268 { "-Wno-comments", "" },
1270 N_("Warn about possibly confusing type conversions") },
1271 { "-Wno-conversion", "" },
1272 { "-Wdiv-by-zero", "" },
1273 { "-Wno-div-by-zero",
1274 N_("Do not warn about compile-time integer division by zero") },
1276 N_("Warn about testing equality of floating point numbers") },
1277 { "-Wno-float-equal", "" },
1279 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1280 { "-Wno-format", "" },
1281 { "-Wformat-extra-args", "" },
1282 { "-Wno-format-extra-args",
1283 N_("Don't warn about too many arguments to format functions") },
1284 { "-Wformat-nonliteral",
1285 N_("Warn about non-string-literal format strings") },
1286 { "-Wno-format-nonliteral", "" },
1287 { "-Wformat-security",
1288 N_("Warn about possible security problems with format functions") },
1289 { "-Wno-format-security", "" },
1290 { "-Wformat-y2k", "" },
1291 { "-Wno-format-y2k",
1292 N_("Don't warn about strftime formats yielding 2 digit years") },
1293 { "-Wimplicit-function-declaration",
1294 N_("Warn about implicit function declarations") },
1295 { "-Wno-implicit-function-declaration", "" },
1296 { "-Werror-implicit-function-declaration", "" },
1298 N_("Warn when a declaration does not specify a type") },
1299 { "-Wno-implicit-int", "" },
1300 { "-Wimplicit", "" },
1301 { "-Wno-implicit", "" },
1303 N_("Warn about the use of the #import directive") },
1304 { "-Wno-import", "" },
1306 N_("Warn about PCH files that are found but not used") },
1307 { "-Wlong-long","" },
1309 N_("Do not warn about using 'long long' when -pedantic") },
1311 N_("Warn about suspicious declarations of main") },
1312 { "-Wno-main", "" },
1313 { "-Wmissing-braces",
1314 N_("Warn about possibly missing braces around initializers") },
1315 { "-Wno-missing-braces", "" },
1316 { "-Wmissing-declarations",
1317 N_("Warn about global funcs without previous declarations") },
1318 { "-Wno-missing-declarations", "" },
1319 { "-Wmissing-prototypes",
1320 N_("Warn about global funcs without prototypes") },
1321 { "-Wno-missing-prototypes", "" },
1323 N_("Warn about use of multicharacter literals") },
1324 { "-Wno-multichar", "" },
1325 { "-Wnested-externs",
1326 N_("Warn about externs not at file scope level") },
1327 { "-Wno-nested-externs", "" },
1329 N_("Warn about possible missing parentheses") },
1330 { "-Wno-parentheses", "" },
1331 { "-Wpointer-arith",
1332 N_("Warn about function pointer arithmetic") },
1333 { "-Wno-pointer-arith", "" },
1334 { "-Wredundant-decls",
1335 N_("Warn about multiple declarations of the same object") },
1336 { "-Wno-redundant-decls", "" },
1338 N_("Warn whenever a function's return-type defaults to int") },
1339 { "-Wno-return-type", "" },
1340 { "-Wsequence-point",
1341 N_("Warn about possible violations of sequence point rules") },
1342 { "-Wno-sequence-point", "" },
1344 N_("Warn about signed/unsigned comparisons") },
1345 { "-Wno-sign-compare", "" },
1346 { "-Wstrict-prototypes",
1347 N_("Warn about non-prototyped function decls") },
1348 { "-Wno-strict-prototypes", "" },
1350 N_("Warn about constructs whose meanings change in ISO C") },
1351 { "-Wno-traditional", "" },
1353 N_("Warn when trigraphs are encountered") },
1354 { "-Wno-trigraphs", "" },
1356 { "-Wno-undef", "" },
1357 { "-Wunknown-pragmas",
1358 N_("Warn about unrecognized pragmas") },
1359 { "-Wno-unknown-pragmas", "" },
1360 { "-Wwrite-strings",
1361 N_("Mark strings as 'const char *'") },
1362 { "-Wno-write-strings", "" },
1364 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1366 #include "options.h"
1370 /* Here is a table, controlled by the tm.h file, listing each -m switch
1371 and which bits in `target_switches' it should set or clear.
1372 If VALUE is positive, it is bits to set.
1373 If VALUE is negative, -VALUE is bits to clear.
1374 (The sign bit is not used so there is no confusion.) */
1378 const char *const name;
1380 const char *const description;
1382 target_switches[] = TARGET_SWITCHES;
1384 /* This table is similar, but allows the switch to have a value. */
1386 #ifdef TARGET_OPTIONS
1389 const char *const prefix;
1390 const char **const variable;
1391 const char *const description;
1393 target_options[] = TARGET_OPTIONS;
1396 /* Options controlling warnings. */
1398 /* Don't print warning messages. -w. */
1400 int inhibit_warnings = 0;
1402 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1404 int warn_system_headers = 0;
1406 /* Print various extra warnings. -W/-Wextra. */
1408 int extra_warnings = 0;
1410 /* Treat warnings as errors. -Werror. */
1412 int warnings_are_errors = 0;
1414 /* Nonzero to warn about unused variables, functions et.al. */
1416 int warn_unused_function;
1417 int warn_unused_label;
1418 int warn_unused_parameter;
1419 int warn_unused_variable;
1420 int warn_unused_value;
1422 /* Nonzero to warn about code which is never reached. */
1424 int warn_notreached;
1426 /* Nonzero to warn about variables used before they are initialized. */
1428 int warn_uninitialized;
1430 /* Nonzero means warn about all declarations which shadow others. */
1434 /* Warn if a switch on an enum, that does not have a default case,
1435 fails to have a case for every enum value. */
1439 /* Warn if a switch does not have a default case. */
1441 int warn_switch_default;
1443 /* Warn if a switch on an enum fails to have a case for every enum
1444 value (regardless of the presence or otherwise of a default case). */
1446 int warn_switch_enum;
1448 /* Nonzero means warn about function definitions that default the return type
1449 or that use a null return and have a return-type other than void. */
1451 int warn_return_type;
1453 /* Nonzero means warn about pointer casts that increase the required
1454 alignment of the target type (and might therefore lead to a crash
1455 due to a misaligned access). */
1457 int warn_cast_align;
1459 /* Nonzero means warn about any objects definitions whose size is larger
1460 than N bytes. Also want about function definitions whose returned
1461 values are larger than N bytes. The value N is in `larger_than_size'. */
1463 int warn_larger_than;
1464 HOST_WIDE_INT larger_than_size;
1466 /* Nonzero means warn if inline function is too large. */
1470 /* Warn if a function returns an aggregate,
1471 since there are often incompatible calling conventions for doing this. */
1473 int warn_aggregate_return;
1475 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1479 /* Warn when gcc pads a structure to an alignment boundary. */
1483 /* Warn when an optimization pass is disabled. */
1485 int warn_disabled_optimization;
1487 /* Warn about functions which might be candidates for attribute noreturn. */
1489 int warn_missing_noreturn;
1491 /* Nonzero means warn about uses of __attribute__((deprecated))
1494 int warn_deprecated_decl = 1;
1496 /* Nonzero means warn about constructs which might not be
1497 strict-aliasing safe. */
1499 int warn_strict_aliasing;
1501 /* Like f_options, but for -W. */
1503 static const lang_independent_options W_options[] =
1505 {"unused-function", &warn_unused_function, 1,
1506 N_("Warn when a function is unused") },
1507 {"unused-label", &warn_unused_label, 1,
1508 N_("Warn when a label is unused") },
1509 {"unused-parameter", &warn_unused_parameter, 1,
1510 N_("Warn when a function parameter is unused") },
1511 {"unused-variable", &warn_unused_variable, 1,
1512 N_("Warn when a variable is unused") },
1513 {"unused-value", &warn_unused_value, 1,
1514 N_("Warn when an expression value is unused") },
1515 {"system-headers", &warn_system_headers, 1,
1516 N_("Do not suppress warnings from system headers") },
1517 {"error", &warnings_are_errors, 1,
1518 N_("Treat all warnings as errors") },
1519 {"shadow", &warn_shadow, 1,
1520 N_("Warn when one local variable shadows another") },
1521 {"switch", &warn_switch, 1,
1522 N_("Warn about enumerated switches, with no default, missing a case") },
1523 {"switch-default", &warn_switch_default, 1,
1524 N_("Warn about enumerated switches missing a default case") },
1525 {"switch-enum", &warn_switch_enum, 1,
1526 N_("Warn about all enumerated switches missing a specific case") },
1527 {"aggregate-return", &warn_aggregate_return, 1,
1528 N_("Warn about returning structures, unions or arrays") },
1529 {"cast-align", &warn_cast_align, 1,
1530 N_("Warn about pointer casts which increase alignment") },
1531 {"unreachable-code", &warn_notreached, 1,
1532 N_("Warn about code that will never be executed") },
1533 {"uninitialized", &warn_uninitialized, 1,
1534 N_("Warn about uninitialized automatic variables") },
1535 {"inline", &warn_inline, 1,
1536 N_("Warn when an inlined function cannot be inlined") },
1537 {"packed", &warn_packed, 1,
1538 N_("Warn when the packed attribute has no effect on struct layout") },
1539 {"padded", &warn_padded, 1,
1540 N_("Warn when padding is required to align struct members") },
1541 {"disabled-optimization", &warn_disabled_optimization, 1,
1542 N_("Warn when an optimization pass is disabled") },
1543 {"deprecated-declarations", &warn_deprecated_decl, 1,
1544 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1545 {"extra", &extra_warnings, 1,
1546 N_("Print extra (possibly unwanted) warnings") },
1547 {"missing-noreturn", &warn_missing_noreturn, 1,
1548 N_("Warn about functions which might be candidates for attribute noreturn") },
1549 {"strict-aliasing", &warn_strict_aliasing, 1,
1550 N_ ("Warn about code which might break the strict aliasing rules") }
1554 set_Wunused (setting)
1557 warn_unused_function = setting;
1558 warn_unused_label = setting;
1559 /* Unused function parameter warnings are reported when either ``-W
1560 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1561 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1563 warn_unused_parameter = 0;
1564 else if (!warn_unused_parameter)
1565 warn_unused_parameter = -1;
1566 warn_unused_variable = setting;
1567 warn_unused_value = setting;
1570 /* The following routines are useful in setting all the flags that
1571 -ffast-math and -fno-fast-math imply. */
1574 set_fast_math_flags (set)
1577 flag_trapping_math = !set;
1578 flag_unsafe_math_optimizations = set;
1579 flag_finite_math_only = set;
1580 flag_errno_math = !set;
1582 flag_signaling_nans = 0;
1585 /* Return true iff flags are set as if -ffast-math. */
1587 fast_math_flags_set_p ()
1589 return (!flag_trapping_math
1590 && flag_unsafe_math_optimizations
1591 && flag_finite_math_only
1592 && !flag_errno_math);
1596 /* Output files for assembler code (real compiler output)
1597 and debugging dumps. */
1600 FILE *aux_info_file;
1601 FILE *rtl_dump_file = NULL;
1603 /* Decode the string P as an integral parameter.
1604 If the string is indeed an integer return its numeric value else
1605 issue an Invalid Option error for the option PNAME and return DEFVAL.
1606 If PNAME is zero just return DEFVAL, do not call error. */
1609 read_integral_parameter (p, pname, defval)
1614 const char *endp = p;
1618 if (ISDIGIT (*endp))
1627 error ("invalid option `%s'", pname);
1634 /* This calls abort and is used to avoid problems when abort is a macro.
1635 It is used when we need to pass the address of abort. */
1643 /* When `malloc.c' is compiled with `rcheck' defined,
1644 it calls this function to report clobberage. */
1648 const char *s ATTRIBUTE_UNUSED;
1653 /* Return the logarithm of X, base 2, considering X unsigned,
1654 if X is a power of 2. Otherwise, returns -1.
1656 This should be used via the `exact_log2' macro. */
1660 unsigned HOST_WIDE_INT x;
1663 /* Test for 0 or a power of 2. */
1664 if (x == 0 || x != (x & -x))
1666 while ((x >>= 1) != 0)
1671 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1672 If X is 0, return -1.
1674 This should be used via the floor_log2 macro. */
1678 unsigned HOST_WIDE_INT x;
1687 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1688 into ICE messages, which is much more user friendly. */
1691 crash_signal (signo)
1694 internal_error ("%s", strsignal (signo));
1697 /* Arrange to dump core on error. (The regular error message is still
1698 printed first, except in the case of abort().) */
1701 setup_core_dumping ()
1704 signal (SIGABRT, SIG_DFL);
1706 #if defined(HAVE_SETRLIMIT)
1709 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1710 fatal_io_error ("getting core file size maximum limit");
1711 rlim.rlim_cur = rlim.rlim_max;
1712 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1713 fatal_io_error ("setting core file size limit to maximum");
1716 diagnostic_abort_on_error (global_dc);
1720 /* Strip off a legitimate source ending from the input string NAME of
1721 length LEN. Rather than having to know the names used by all of
1722 our front ends, we strip off an ending of a period followed by
1723 up to five characters. (Java uses ".class".) */
1726 strip_off_ending (name, len)
1731 for (i = 2; i < 6 && len > i; i++)
1733 if (name[len - i] == '.')
1735 name[len - i] = '\0';
1741 /* Output a quoted string. */
1744 output_quoted_string (asm_file, string)
1748 #ifdef OUTPUT_QUOTED_STRING
1749 OUTPUT_QUOTED_STRING (asm_file, string);
1753 putc ('\"', asm_file);
1754 while ((c = *string++) != 0)
1758 if (c == '\"' || c == '\\')
1759 putc ('\\', asm_file);
1763 fprintf (asm_file, "\\%03o", (unsigned char) c);
1765 putc ('\"', asm_file);
1769 /* Output NAME into FILE after having turned it into something
1770 usable as an identifier in a target's assembly file. */
1772 output_clean_symbol_name (file, name)
1776 /* Make a copy of NAME. */
1777 char *id = xstrdup (name);
1779 /* Make it look like a valid identifier for an assembler. */
1780 clean_symbol_name (id);
1787 /* Output a file name in the form wanted by System V. */
1790 output_file_directive (asm_file, input_name)
1792 const char *input_name;
1794 int len = strlen (input_name);
1795 const char *na = input_name + len;
1797 /* NA gets INPUT_NAME sans directory names. */
1798 while (na > input_name)
1800 if (IS_DIR_SEPARATOR (na[-1]))
1805 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1806 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1808 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1809 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1811 fprintf (asm_file, "\t.file\t");
1812 output_quoted_string (asm_file, na);
1813 fputc ('\n', asm_file);
1818 /* Routine to open a dump file. Return true if the dump file is enabled. */
1821 open_dump_file (index, decl)
1822 enum dump_file_index index;
1826 const char *open_arg;
1829 if (! dump_file[index].enabled)
1832 timevar_push (TV_DUMP);
1833 if (rtl_dump_file != NULL)
1834 fclose (rtl_dump_file);
1836 sprintf (seq, DUMPFILE_FORMAT, index);
1838 if (! dump_file[index].initialized)
1840 /* If we've not initialized the files, do so now. */
1841 if (graph_dump_format != no_graph
1842 && dump_file[index].graph_dump_p)
1844 dump_name = concat (seq, dump_file[index].extension, NULL);
1845 clean_graph_dump_file (dump_base_name, dump_name);
1848 dump_file[index].initialized = 1;
1854 dump_name = concat (dump_base_name, seq,
1855 dump_file[index].extension, NULL);
1857 rtl_dump_file = fopen (dump_name, open_arg);
1858 if (rtl_dump_file == NULL)
1859 fatal_io_error ("can't open %s", dump_name);
1864 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1865 (*lang_hooks.decl_printable_name) (decl, 2),
1866 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1868 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1869 ? " (unlikely executed)"
1872 timevar_pop (TV_DUMP);
1876 /* Routine to close a dump file. */
1879 close_dump_file (index, func, insns)
1880 enum dump_file_index index;
1881 void (*func) PARAMS ((FILE *, rtx));
1884 if (! rtl_dump_file)
1887 timevar_push (TV_DUMP);
1889 && graph_dump_format != no_graph
1890 && dump_file[index].graph_dump_p)
1895 sprintf (seq, DUMPFILE_FORMAT, index);
1896 suffix = concat (seq, dump_file[index].extension, NULL);
1897 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1902 func (rtl_dump_file, insns);
1904 fflush (rtl_dump_file);
1905 fclose (rtl_dump_file);
1907 rtl_dump_file = NULL;
1908 timevar_pop (TV_DUMP);
1911 /* Do any final processing required for the declarations in VEC, of
1912 which there are LEN. We write out inline functions and variables
1913 that have been deferred until this point, but which are required.
1914 Returns nonzero if anything was put out. */
1917 wrapup_global_declarations (vec, len)
1924 int output_something = 0;
1926 for (i = 0; i < len; i++)
1930 /* We're not deferring this any longer. */
1931 DECL_DEFER_OUTPUT (decl) = 0;
1933 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1934 (*lang_hooks.finish_incomplete_decl) (decl);
1937 /* Now emit any global variables or functions that we have been
1938 putting off. We need to loop in case one of the things emitted
1939 here references another one which comes earlier in the list. */
1943 for (i = 0; i < len; i++)
1947 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1950 /* Don't write out static consts, unless we still need them.
1952 We also keep static consts if not optimizing (for debugging),
1953 unless the user specified -fno-keep-static-consts.
1954 ??? They might be better written into the debug information.
1955 This is possible when using DWARF.
1957 A language processor that wants static constants to be always
1958 written out (even if it is not used) is responsible for
1959 calling rest_of_decl_compilation itself. E.g. the C front-end
1960 calls rest_of_decl_compilation from finish_decl.
1961 One motivation for this is that is conventional in some
1962 environments to write things like:
1963 static const char rcsid[] = "... version string ...";
1964 intending to force the string to be in the executable.
1966 A language processor that would prefer to have unneeded
1967 static constants "optimized away" would just defer writing
1968 them out until here. E.g. C++ does this, because static
1969 constants are often defined in header files.
1971 ??? A tempting alternative (for both C and C++) would be
1972 to force a constant to be written if and only if it is
1973 defined in a main file, as opposed to an include file. */
1975 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1979 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1981 else if (DECL_COMDAT (decl))
1983 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1984 && (optimize || !flag_keep_static_consts
1985 || DECL_ARTIFICIAL (decl)))
1991 rest_of_decl_compilation (decl, NULL, 1, 1);
1995 if (TREE_CODE (decl) == FUNCTION_DECL
1996 && DECL_INITIAL (decl) != 0
1997 && DECL_SAVED_INSNS (decl) != 0
1998 && (flag_keep_inline_functions
1999 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2000 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2003 output_inline_function (decl);
2008 output_something = 1;
2012 return output_something;
2015 /* Issue appropriate warnings for the global declarations in VEC (of
2016 which there are LEN). Output debugging information for them. */
2019 check_global_declarations (vec, len)
2026 for (i = 0; i < len; i++)
2030 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2031 && ! TREE_ASM_WRITTEN (decl))
2032 /* Cancel the RTL for this decl so that, if debugging info
2033 output for global variables is still to come,
2034 this one will be omitted. */
2035 SET_DECL_RTL (decl, NULL_RTX);
2037 /* Warn about any function
2038 declared static but not defined.
2039 We don't warn about variables,
2040 because many programs have static variables
2041 that exist only to get some text into the object file. */
2042 if (TREE_CODE (decl) == FUNCTION_DECL
2043 && (warn_unused_function
2044 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2045 && DECL_INITIAL (decl) == 0
2046 && DECL_EXTERNAL (decl)
2047 && ! DECL_ARTIFICIAL (decl)
2048 && ! TREE_PUBLIC (decl))
2050 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2051 pedwarn_with_decl (decl,
2052 "`%s' used but never defined");
2054 warning_with_decl (decl,
2055 "`%s' declared `static' but never defined");
2056 /* This symbol is effectively an "extern" declaration now. */
2057 TREE_PUBLIC (decl) = 1;
2058 assemble_external (decl);
2061 /* Warn about static fns or vars defined but not used. */
2062 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2063 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2064 && ! TREE_USED (decl)
2065 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2066 to handle multiple external decls in different scopes. */
2067 && ! TREE_USED (DECL_NAME (decl))
2068 && ! DECL_EXTERNAL (decl)
2069 && ! TREE_PUBLIC (decl)
2070 /* Global register variables must be declared to reserve them. */
2071 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2072 /* Otherwise, ask the language. */
2073 && (*lang_hooks.decls.warn_unused_global) (decl))
2074 warning_with_decl (decl, "`%s' defined but not used");
2076 /* Avoid confusing the debug information machinery when there are
2078 if (errorcount == 0 && sorrycount == 0)
2080 timevar_push (TV_SYMOUT);
2081 (*debug_hooks->global_decl) (decl);
2082 timevar_pop (TV_SYMOUT);
2087 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2088 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2089 INPUT_FILENAME and LINENO accordingly. */
2092 push_srcloc (file, line)
2096 struct file_stack *fs;
2098 if (input_file_stack)
2100 input_file_stack->name = input_filename;
2101 input_file_stack->line = lineno;
2104 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2105 fs->name = input_filename = file;
2106 fs->line = lineno = line;
2107 fs->next = input_file_stack;
2108 input_file_stack = fs;
2109 input_file_stack_tick++;
2112 /* Pop the top entry off the stack of presently open source files.
2113 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2119 struct file_stack *fs;
2121 fs = input_file_stack;
2122 input_file_stack = fs->next;
2124 input_file_stack_tick++;
2125 /* The initial source file is never popped. */
2126 if (!input_file_stack)
2128 input_filename = input_file_stack->name;
2129 lineno = input_file_stack->line;
2132 /* Compile an entire translation unit. Write a file of assembly
2133 output and various debugging dumps. */
2140 /* Initialize yet another pass. */
2142 init_final (main_input_filename);
2143 init_branch_prob (aux_base_name);
2145 timevar_push (TV_PARSE);
2147 /* Call the parser, which parses the entire file (calling
2148 rest_of_compilation for each function). */
2149 (*lang_hooks.parse_file) (set_yydebug);
2151 /* In case there were missing block closers,
2152 get us back to the global binding level. */
2153 (*lang_hooks.clear_binding_stack) ();
2155 /* Compilation is now finished except for writing
2156 what's left of the symbol table output. */
2157 timevar_pop (TV_PARSE);
2159 if (flag_syntax_only)
2162 globals = (*lang_hooks.decls.getdecls) ();
2164 /* Really define vars that have had only a tentative definition.
2165 Really output inline functions that must actually be callable
2166 and have not been output so far. */
2169 int len = list_length (globals);
2170 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2174 /* Process the decls in reverse order--earliest first.
2175 Put them into VEC from back to front, then take out from front. */
2177 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2178 vec[len - i - 1] = decl;
2180 wrapup_global_declarations (vec, len);
2182 if (profile_arc_flag)
2183 /* This must occur after the loop to output deferred functions.
2184 Else the profiler initializer would not be emitted if all the
2185 functions in this compilation unit were deferred. */
2188 check_global_declarations (vec, len);
2194 /* Write out any pending weak symbol declarations. */
2198 /* Do dbx symbols. */
2199 timevar_push (TV_SYMOUT);
2201 #ifdef DWARF2_UNWIND_INFO
2202 if (dwarf2out_do_frame ())
2203 dwarf2out_frame_finish ();
2206 (*debug_hooks->finish) (main_input_filename);
2207 timevar_pop (TV_SYMOUT);
2209 /* Output some stuff at end of file if nec. */
2211 dw2_output_indirect_constants ();
2213 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2215 timevar_push (TV_DUMP);
2216 open_dump_file (DFI_bp, NULL);
2220 close_dump_file (DFI_bp, NULL, NULL_RTX);
2221 timevar_pop (TV_DUMP);
2225 ASM_FILE_END (asm_out_file);
2228 /* Attach a special .ident directive to the end of the file to identify
2229 the version of GCC which compiled this code. The format of the .ident
2230 string is patterned after the ones produced by native SVR4 compilers. */
2233 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2234 IDENT_ASM_OP, version_string);
2237 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2239 timevar_push (TV_DUMP);
2240 dump_combine_total_stats (rtl_dump_file);
2241 close_dump_file (DFI_combine, NULL, NULL_RTX);
2242 timevar_pop (TV_DUMP);
2246 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2247 and TYPE_DECL nodes.
2249 This does nothing for local (non-static) variables, unless the
2250 variable is a register variable with an ASMSPEC. In that case, or
2251 if the variable is not an automatic, it sets up the RTL and
2252 outputs any assembler code (label definition, storage allocation
2253 and initialization).
2255 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2256 the assembler symbol name to be used. TOP_LEVEL is nonzero
2257 if this declaration is not within a function. */
2260 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2262 const char *asmspec;
2266 /* We deferred calling assemble_alias so that we could collect
2267 other attributes such as visibility. Emit the alias now. */
2270 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2273 alias = TREE_VALUE (TREE_VALUE (alias));
2274 alias = get_identifier (TREE_STRING_POINTER (alias));
2275 assemble_alias (decl, alias);
2279 /* Forward declarations for nested functions are not "external",
2280 but we need to treat them as if they were. */
2281 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2282 || TREE_CODE (decl) == FUNCTION_DECL)
2284 timevar_push (TV_VARCONST);
2287 make_decl_rtl (decl, asmspec);
2289 /* Don't output anything when a tentative file-scope definition
2290 is seen. But at end of compilation, do output code for them. */
2291 if (at_end || !DECL_DEFER_OUTPUT (decl))
2292 assemble_variable (decl, top_level, at_end, 0);
2294 #ifdef ASM_FINISH_DECLARE_OBJECT
2295 if (decl == last_assemble_variable_decl)
2297 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2302 timevar_pop (TV_VARCONST);
2304 else if (DECL_REGISTER (decl) && asmspec != 0)
2306 if (decode_reg_name (asmspec) >= 0)
2308 SET_DECL_RTL (decl, NULL_RTX);
2309 make_decl_rtl (decl, asmspec);
2313 error ("invalid register name `%s' for register variable", asmspec);
2314 DECL_REGISTER (decl) = 0;
2319 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2320 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2321 && TREE_CODE (decl) == TYPE_DECL)
2323 timevar_push (TV_SYMOUT);
2324 dbxout_symbol (decl, 0);
2325 timevar_pop (TV_SYMOUT);
2328 #ifdef SDB_DEBUGGING_INFO
2329 else if (write_symbols == SDB_DEBUG && top_level
2330 && TREE_CODE (decl) == TYPE_DECL)
2332 timevar_push (TV_SYMOUT);
2333 sdbout_symbol (decl, 0);
2334 timevar_pop (TV_SYMOUT);
2337 #ifdef DWARF2_DEBUGGING_INFO
2338 else if ((write_symbols == DWARF2_DEBUG
2339 || write_symbols == VMS_AND_DWARF2_DEBUG)
2341 && TREE_CODE (decl) == TYPE_DECL)
2343 timevar_push (TV_SYMOUT);
2344 dwarf2out_decl (decl);
2345 timevar_pop (TV_SYMOUT);
2350 /* Called after finishing a record, union or enumeral type. */
2353 rest_of_type_compilation (type, toplev)
2354 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2355 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2359 tree type ATTRIBUTE_UNUSED;
2360 int toplev ATTRIBUTE_UNUSED;
2363 /* Avoid confusing the debug information machinery when there are
2365 if (errorcount != 0 || sorrycount != 0)
2368 timevar_push (TV_SYMOUT);
2369 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2370 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2371 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2373 #ifdef SDB_DEBUGGING_INFO
2374 if (write_symbols == SDB_DEBUG)
2375 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2377 #ifdef DWARF2_DEBUGGING_INFO
2378 if ((write_symbols == DWARF2_DEBUG
2379 || write_symbols == VMS_AND_DWARF2_DEBUG)
2381 dwarf2out_decl (TYPE_STUB_DECL (type));
2383 timevar_pop (TV_SYMOUT);
2386 /* This is called from finish_function (within langhooks.parse_file)
2387 after each top-level definition is parsed.
2388 It is supposed to compile that function or variable
2389 and output the assembler code for it.
2390 After we return, the tree storage is freed. */
2393 rest_of_compilation (decl)
2399 int rebuild_label_notes_after_reload;
2401 timevar_push (TV_REST_OF_COMPILATION);
2403 /* Now that we're out of the frontend, we shouldn't have any more
2404 CONCATs anywhere. */
2405 generating_concat_p = 0;
2407 /* When processing delayed functions, prepare_function_start() won't
2408 have been run to re-initialize it. */
2409 cse_not_expected = ! optimize;
2411 /* First, make sure that NOTE_BLOCK is set correctly for each
2412 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2413 if (!cfun->x_whole_function_mode_p)
2416 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2417 tree in sensible shape. So, we just recalculate it here. */
2418 if (cfun->x_whole_function_mode_p)
2423 /* If we are reconsidering an inline function
2424 at the end of compilation, skip the stuff for making it inline. */
2426 if (DECL_SAVED_INSNS (decl) == 0)
2432 /* If this is nested inside an inlined external function, pretend
2433 it was only declared. Since we cannot inline such functions,
2434 generating code for this one is not only not necessary but will
2435 confuse some debugging output writers. */
2436 for (parent = DECL_CONTEXT (current_function_decl);
2437 parent != NULL_TREE;
2438 parent = get_containing_scope (parent))
2439 if (TREE_CODE (parent) == FUNCTION_DECL
2440 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2442 DECL_INITIAL (decl) = 0;
2443 goto exit_rest_of_compilation;
2445 else if (TYPE_P (parent))
2446 /* A function in a local class should be treated normally. */
2449 /* If requested, consider whether to make this function inline. */
2450 if ((DECL_INLINE (decl) && !flag_no_inline)
2451 || flag_inline_functions)
2453 timevar_push (TV_INTEGRATION);
2454 lose = function_cannot_inline_p (decl);
2455 timevar_pop (TV_INTEGRATION);
2456 if (lose || ! optimize)
2458 if (warn_inline && DECL_INLINE (decl))
2459 warning_with_decl (decl, lose);
2460 DECL_ABSTRACT_ORIGIN (decl) = 0;
2461 /* Don't really compile an extern inline function.
2462 If we can't make it inline, pretend
2463 it was only declared. */
2464 if (DECL_EXTERNAL (decl))
2466 DECL_INITIAL (decl) = 0;
2467 goto exit_rest_of_compilation;
2471 /* ??? Note that this has the effect of making it look
2472 like "inline" was specified for a function if we choose
2473 to inline it. This isn't quite right, but it's
2474 probably not worth the trouble to fix. */
2475 inlinable = DECL_INLINE (decl) = 1;
2478 insns = get_insns ();
2480 /* Dump the rtl code if we are dumping rtl. */
2482 if (open_dump_file (DFI_rtl, decl))
2484 if (DECL_SAVED_INSNS (decl))
2485 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2486 close_dump_file (DFI_rtl, print_rtl, insns);
2489 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2490 sorts of eh initialization. Delay this until after the
2491 initial rtl dump so that we can see the original nesting. */
2492 convert_from_eh_region_ranges ();
2494 /* If function is inline, and we don't yet know whether to
2495 compile it by itself, defer decision till end of compilation.
2496 wrapup_global_declarations will (indirectly) call
2497 rest_of_compilation again for those functions that need to
2498 be output. Also defer those functions that we are supposed
2502 || (DECL_INLINE (decl)
2503 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2504 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2505 && ! flag_keep_inline_functions)
2506 || DECL_EXTERNAL (decl))))
2507 DECL_DEFER_OUTPUT (decl) = 1;
2509 if (DECL_INLINE (decl))
2510 /* DWARF wants separate debugging info for abstract and
2511 concrete instances of all inline functions, including those
2512 declared inline but not inlined, and those inlined even
2513 though they weren't declared inline. Conveniently, that's
2514 what DECL_INLINE means at this point. */
2515 (*debug_hooks->deferred_inline_function) (decl);
2517 if (DECL_DEFER_OUTPUT (decl))
2519 /* If -Wreturn-type, we have to do a bit of compilation. We just
2520 want to call cleanup the cfg to figure out whether or not we can
2521 fall off the end of the function; we do the minimum amount of
2522 work necessary to make that safe. */
2523 if (warn_return_type)
2525 int saved_optimize = optimize;
2528 rebuild_jump_labels (insns);
2529 find_exception_handler_labels ();
2530 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2531 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2532 optimize = saved_optimize;
2534 /* CFG is no longer maintained up-to-date. */
2535 free_bb_for_insn ();
2538 set_nothrow_function_flags ();
2539 if (current_function_nothrow)
2540 /* Now we know that this can't throw; set the flag for the benefit
2541 of other functions later in this translation unit. */
2542 TREE_NOTHROW (current_function_decl) = 1;
2544 timevar_push (TV_INTEGRATION);
2545 save_for_inline (decl);
2546 timevar_pop (TV_INTEGRATION);
2547 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2548 goto exit_rest_of_compilation;
2551 /* If specified extern inline but we aren't inlining it, we are
2552 done. This goes for anything that gets here with DECL_EXTERNAL
2553 set, not just things with DECL_INLINE. */
2554 if (DECL_EXTERNAL (decl))
2555 goto exit_rest_of_compilation;
2558 /* If we're emitting a nested function, make sure its parent gets
2559 emitted as well. Doing otherwise confuses debug info. */
2562 for (parent = DECL_CONTEXT (current_function_decl);
2563 parent != NULL_TREE;
2564 parent = get_containing_scope (parent))
2565 if (TREE_CODE (parent) == FUNCTION_DECL)
2566 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2569 /* We are now committed to emitting code for this function. Do any
2570 preparation, such as emitting abstract debug info for the inline
2571 before it gets mangled by optimization. */
2572 if (DECL_INLINE (decl))
2573 (*debug_hooks->outlining_inline_function) (decl);
2575 /* Remove any notes we don't need. That will make iterating
2576 over the instruction sequence faster, and allow the garbage
2577 collector to reclaim the memory used by the notes. */
2578 remove_unnecessary_notes ();
2583 /* Initialize some variables used by the optimizers. */
2584 init_function_for_compilation ();
2586 if (! DECL_DEFER_OUTPUT (decl))
2587 TREE_ASM_WRITTEN (decl) = 1;
2589 /* Now that integrate will no longer see our rtl, we need not
2590 distinguish between the return value of this function and the
2591 return value of called functions. Also, we can remove all SETs
2592 of subregs of hard registers; they are only here because of
2593 integrate. Also, we can now initialize pseudos intended to
2594 carry magic hard reg data throughout the function. */
2595 rtx_equal_function_value_matters = 0;
2596 purge_hard_subreg_sets (get_insns ());
2598 /* Early return if there were errors. We can run afoul of our
2599 consistency checks, and there's not really much point in fixing them.
2600 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2601 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2602 || errorcount || sorrycount)
2603 goto exit_rest_of_compilation;
2605 timevar_push (TV_JUMP);
2606 open_dump_file (DFI_sibling, decl);
2607 insns = get_insns ();
2608 rebuild_jump_labels (insns);
2609 find_exception_handler_labels ();
2610 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2612 delete_unreachable_blocks ();
2614 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2615 timevar_push (TV_BRANCH_PROB);
2616 note_prediction_to_br_prob ();
2617 timevar_pop (TV_BRANCH_PROB);
2619 /* We may have potential sibling or tail recursion sites. Select one
2620 (of possibly multiple) methods of performing the call. */
2621 if (flag_optimize_sibling_calls)
2624 optimize_sibling_and_tail_recursive_calls ();
2626 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2627 free_bb_for_insn ();
2628 find_exception_handler_labels ();
2629 rebuild_jump_labels (insns);
2630 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2632 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2633 notes before simplifying cfg and we must do lowering after sibcall
2634 that unhides parts of RTL chain and cleans up the CFG.
2636 Until sibcall is replaced by tree-level optimizer, lets just
2637 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2638 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2639 if (GET_CODE (insn) == NOTE
2640 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2643 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2644 timevar_pop (TV_JUMP);
2646 scope_to_insns_initialize ();
2647 /* Complete generation of exception handling code. */
2650 timevar_push (TV_JUMP);
2651 open_dump_file (DFI_eh, decl);
2653 finish_eh_generation ();
2655 close_dump_file (DFI_eh, print_rtl, get_insns ());
2656 timevar_pop (TV_JUMP);
2659 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2660 generation, which might create new sets. */
2661 emit_initial_value_sets ();
2664 /* If we are doing position-independent code generation, now
2665 is the time to output special prologues and epilogues.
2666 We do not want to do this earlier, because it just clutters
2667 up inline functions with meaningless insns. */
2672 insns = get_insns ();
2674 /* Copy any shared structure that should not be shared. */
2675 unshare_all_rtl (current_function_decl, insns);
2677 #ifdef SETJMP_VIA_SAVE_AREA
2678 /* This must be performed before virtual register instantiation.
2679 Please be aware the everything in the compiler that can look
2680 at the RTL up to this point must understand that REG_SAVE_AREA
2681 is just like a use of the REG contained inside. */
2682 if (current_function_calls_alloca)
2683 optimize_save_area_alloca (insns);
2686 /* Instantiate all virtual registers. */
2687 instantiate_virtual_regs (current_function_decl, insns);
2689 open_dump_file (DFI_jump, decl);
2691 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2692 are initialized and to compute whether control can drop off the end
2695 timevar_push (TV_JUMP);
2696 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2697 before jump optimization switches branch directions. */
2698 expected_value_to_br_prob ();
2700 reg_scan (insns, max_reg_num (), 0);
2701 rebuild_jump_labels (insns);
2702 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2704 dump_flow_info (rtl_dump_file);
2705 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2706 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2708 /* CFG is no longer maintained up-to-date. */
2709 free_bb_for_insn ();
2710 copy_loop_headers (insns);
2711 purge_line_number_notes (insns);
2712 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2714 timevar_pop (TV_JUMP);
2715 close_dump_file (DFI_jump, print_rtl, insns);
2717 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2718 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2720 goto exit_rest_of_compilation;
2723 /* Long term, this should probably move before the jump optimizer too,
2724 but I didn't want to disturb the rtl_dump_and_exit and related
2725 stuff at this time. */
2726 if (optimize > 0 && flag_ssa)
2728 /* Convert to SSA form. */
2730 timevar_push (TV_TO_SSA);
2731 open_dump_file (DFI_ssa, decl);
2733 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2736 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2737 timevar_pop (TV_TO_SSA);
2739 /* Perform sparse conditional constant propagation, if requested. */
2742 timevar_push (TV_SSA_CCP);
2743 open_dump_file (DFI_ssa_ccp, decl);
2747 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2748 timevar_pop (TV_SSA_CCP);
2751 /* It would be useful to cleanup the CFG at this point, but block
2752 merging and possibly other transformations might leave a PHI
2753 node in the middle of a basic block, which is a strict no-no. */
2755 /* The SSA implementation uses basic block numbers in its phi
2756 nodes. Thus, changing the control-flow graph or the basic
2757 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2758 may cause problems. */
2762 /* Remove dead code. */
2764 timevar_push (TV_SSA_DCE);
2765 open_dump_file (DFI_ssa_dce, decl);
2767 insns = get_insns ();
2768 ssa_eliminate_dead_code ();
2770 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2771 timevar_pop (TV_SSA_DCE);
2774 /* Convert from SSA form. */
2776 timevar_push (TV_FROM_SSA);
2777 open_dump_file (DFI_ussa, decl);
2779 convert_from_ssa ();
2780 /* New registers have been created. Rescan their usage. */
2781 reg_scan (insns, max_reg_num (), 1);
2783 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2784 timevar_pop (TV_FROM_SSA);
2789 timevar_push (TV_JUMP);
2790 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP: 0);
2792 /* Try to identify useless null pointer tests and delete them. */
2793 if (flag_delete_null_pointer_checks)
2795 open_dump_file (DFI_null, decl);
2797 dump_flow_info (rtl_dump_file);
2799 if (delete_null_pointer_checks (insns))
2800 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2802 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2805 /* Jump optimization, and the removal of NULL pointer checks, may
2806 have reduced the number of instructions substantially. CSE, and
2807 future passes, allocate arrays whose dimensions involve the
2808 maximum instruction UID, so if we can reduce the maximum UID
2809 we'll save big on memory. */
2810 renumber_insns (rtl_dump_file);
2811 timevar_pop (TV_JUMP);
2813 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2817 /* Perform common subexpression elimination.
2818 Nonzero value from `cse_main' means that jumps were simplified
2819 and some code may now be unreachable, so do
2820 jump optimization again. */
2824 open_dump_file (DFI_cse, decl);
2826 dump_flow_info (rtl_dump_file);
2827 timevar_push (TV_CSE);
2829 reg_scan (insns, max_reg_num (), 1);
2831 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2833 rebuild_jump_labels (insns);
2834 purge_all_dead_edges (0);
2836 delete_trivially_dead_insns (insns, max_reg_num ());
2838 /* If we are not running more CSE passes, then we are no longer
2839 expecting CSE to be run. But always rerun it in a cheap mode. */
2840 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2842 if (tem || optimize > 1)
2843 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2844 /* Try to identify useless null pointer tests and delete them. */
2845 if (flag_delete_null_pointer_checks)
2847 timevar_push (TV_JUMP);
2849 if (delete_null_pointer_checks (insns))
2850 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2851 timevar_pop (TV_JUMP);
2854 /* The second pass of jump optimization is likely to have
2855 removed a bunch more instructions. */
2856 renumber_insns (rtl_dump_file);
2858 timevar_pop (TV_CSE);
2859 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2862 open_dump_file (DFI_addressof, decl);
2864 purge_addressof (insns);
2866 purge_all_dead_edges (0);
2867 reg_scan (insns, max_reg_num (), 1);
2869 close_dump_file (DFI_addressof, print_rtl, insns);
2873 /* Perform global cse. */
2875 if (optimize > 0 && flag_gcse)
2877 int save_csb, save_cfj;
2880 timevar_push (TV_GCSE);
2881 open_dump_file (DFI_gcse, decl);
2883 tem = gcse_main (insns, rtl_dump_file);
2884 rebuild_jump_labels (insns);
2885 delete_trivially_dead_insns (insns, max_reg_num ());
2887 save_csb = flag_cse_skip_blocks;
2888 save_cfj = flag_cse_follow_jumps;
2889 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2891 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2893 if (flag_expensive_optimizations)
2895 timevar_push (TV_CSE);
2896 reg_scan (insns, max_reg_num (), 1);
2897 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2898 purge_all_dead_edges (0);
2899 delete_trivially_dead_insns (insns, max_reg_num ());
2900 timevar_pop (TV_CSE);
2901 cse_not_expected = !flag_rerun_cse_after_loop;
2904 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2905 things up. Then possibly re-run CSE again. */
2909 timevar_push (TV_JUMP);
2910 rebuild_jump_labels (insns);
2911 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2912 timevar_pop (TV_JUMP);
2914 if (flag_expensive_optimizations)
2916 timevar_push (TV_CSE);
2917 reg_scan (insns, max_reg_num (), 1);
2918 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2919 purge_all_dead_edges (0);
2920 delete_trivially_dead_insns (insns, max_reg_num ());
2921 timevar_pop (TV_CSE);
2925 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2926 timevar_pop (TV_GCSE);
2929 flag_cse_skip_blocks = save_csb;
2930 flag_cse_follow_jumps = save_cfj;
2931 #ifdef ENABLE_CHECKING
2932 verify_flow_info ();
2936 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2937 if (optimize > 0 && flag_gcse && current_function_calls_constant_p)
2938 purge_builtin_constant_p ();
2940 /* Move constant computations out of loops. */
2942 if (optimize > 0 && flag_loop_optimize)
2944 int do_unroll, do_prefetch;
2946 timevar_push (TV_LOOP);
2947 delete_dead_jumptables ();
2948 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2949 open_dump_file (DFI_loop, decl);
2950 /* CFG is no longer maintained up-to-date. */
2951 free_bb_for_insn ();
2953 do_unroll = flag_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2954 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2955 if (flag_rerun_loop_opt)
2957 cleanup_barriers ();
2959 /* We only want to perform unrolling once. */
2960 loop_optimize (insns, rtl_dump_file, do_unroll);
2963 /* The first call to loop_optimize makes some instructions
2964 trivially dead. We delete those instructions now in the
2965 hope that doing so will make the heuristics in loop work
2966 better and possibly speed up compilation. */
2967 delete_trivially_dead_insns (insns, max_reg_num ());
2969 /* The regscan pass is currently necessary as the alias
2970 analysis code depends on this information. */
2971 reg_scan (insns, max_reg_num (), 1);
2973 cleanup_barriers ();
2974 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2976 /* Loop can create trivially dead instructions. */
2977 delete_trivially_dead_insns (insns, max_reg_num ());
2978 close_dump_file (DFI_loop, print_rtl, insns);
2979 timevar_pop (TV_LOOP);
2980 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2985 /* Perform jump bypassing and control flow optimizations. */
2986 if (optimize > 0 && flag_gcse)
2988 timevar_push (TV_BYPASS);
2989 open_dump_file (DFI_bypass, decl);
2991 cleanup_cfg (CLEANUP_EXPENSIVE);
2992 tem = bypass_jumps (rtl_dump_file);
2996 rebuild_jump_labels (insns);
2997 cleanup_cfg (CLEANUP_EXPENSIVE);
2998 delete_trivially_dead_insns (insns, max_reg_num ());
3001 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
3002 timevar_pop (TV_BYPASS);
3006 #ifdef ENABLE_CHECKING
3007 verify_flow_info ();
3011 /* Do control and data flow analysis; wrote some of the results to
3014 timevar_push (TV_FLOW);
3015 open_dump_file (DFI_cfg, decl);
3017 dump_flow_info (rtl_dump_file);
3018 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
3019 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3021 /* It may make more sense to mark constant functions after dead code is
3022 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3023 may insert code making function non-constant, but we still must consider
3024 it as constant, otherwise -fbranch-probabilities will not read data back.
3026 life_analysis rarely eliminates modification of external memory.
3029 mark_constant_function ();
3031 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3033 /* Do branch profiling and static profile estimation passes. */
3034 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3038 timevar_push (TV_BRANCH_PROB);
3039 open_dump_file (DFI_bp, decl);
3040 if (cfun->arc_profile || flag_branch_probabilities)
3043 /* Discover and record the loop depth at the head of each basic
3044 block. The loop infrastructure does the real job for us. */
3045 flow_loops_find (&loops, LOOP_TREE);
3048 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3050 /* Estimate using heuristics if no profiling info is available. */
3051 if (flag_guess_branch_prob)
3052 estimate_probability (&loops);
3054 flow_loops_free (&loops);
3055 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3056 timevar_pop (TV_BRANCH_PROB);
3060 open_dump_file (DFI_ce1, decl);
3061 if (flag_if_conversion)
3063 timevar_push (TV_IFCVT);
3065 dump_flow_info (rtl_dump_file);
3066 cleanup_cfg (CLEANUP_EXPENSIVE);
3067 reg_scan (insns, max_reg_num (), 0);
3069 timevar_pop (TV_IFCVT);
3071 timevar_push (TV_JUMP);
3072 cleanup_cfg (CLEANUP_EXPENSIVE);
3073 reg_scan (insns, max_reg_num (), 0);
3074 timevar_pop (TV_JUMP);
3075 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3079 timevar_push (TV_TRACER);
3080 open_dump_file (DFI_tracer, decl);
3082 dump_flow_info (rtl_dump_file);
3084 cleanup_cfg (CLEANUP_EXPENSIVE);
3085 reg_scan (insns, max_reg_num (), 0);
3086 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3087 timevar_pop (TV_TRACER);
3090 /* Perform loop optimalizations. It might be better to do them a bit
3091 sooner, but we want the profile feedback to work more efficiently. */
3093 && flag_unswitch_loops)
3095 struct loops *loops;
3096 timevar_push (TV_LOOP);
3097 open_dump_file (DFI_loop2, decl);
3099 dump_flow_info (rtl_dump_file);
3101 loops = loop_optimizer_init (rtl_dump_file);
3105 /* The optimalizations: */
3106 if (flag_unswitch_loops)
3107 unswitch_loops (loops);
3109 loop_optimizer_finalize (loops, rtl_dump_file);
3112 cleanup_cfg (CLEANUP_EXPENSIVE);
3113 delete_trivially_dead_insns (insns, max_reg_num ());
3114 reg_scan (insns, max_reg_num (), 0);
3116 dump_flow_info (rtl_dump_file);
3117 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3118 timevar_pop (TV_LOOP);
3122 if (flag_rerun_cse_after_loop)
3124 timevar_push (TV_CSE2);
3125 open_dump_file (DFI_cse2, decl);
3127 dump_flow_info (rtl_dump_file);
3128 /* CFG is no longer maintained up-to-date. */
3129 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3130 purge_all_dead_edges (0);
3131 delete_trivially_dead_insns (insns, max_reg_num ());
3135 timevar_push (TV_JUMP);
3136 rebuild_jump_labels (insns);
3137 cleanup_cfg (CLEANUP_EXPENSIVE);
3138 timevar_pop (TV_JUMP);
3140 reg_scan (insns, max_reg_num (), 0);
3141 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3143 timevar_pop (TV_CSE2);
3146 cse_not_expected = 1;
3148 open_dump_file (DFI_life, decl);
3151 check_function_return_warnings ();
3153 #ifdef ENABLE_CHECKING
3154 verify_flow_info ();
3156 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3158 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3159 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3160 timevar_pop (TV_FLOW);
3164 if (warn_uninitialized || extra_warnings)
3166 uninitialized_vars_warning (DECL_INITIAL (decl));
3168 setjmp_args_warning ();
3174 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3176 /* Insns were inserted, so things might look a bit different. */
3177 insns = get_insns ();
3178 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3179 PROP_LOG_LINKS | PROP_REG_INFO
3180 | PROP_DEATH_NOTES);
3184 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3188 /* If -opt, try combining insns through substitution. */
3192 int rebuild_jump_labels_after_combine = 0;
3194 timevar_push (TV_COMBINE);
3195 open_dump_file (DFI_combine, decl);
3197 rebuild_jump_labels_after_combine
3198 = combine_instructions (insns, max_reg_num ());
3200 /* Combining insns may have turned an indirect jump into a
3201 direct jump. Rebuild the JUMP_LABEL fields of jumping
3203 if (rebuild_jump_labels_after_combine)
3205 timevar_push (TV_JUMP);
3206 rebuild_jump_labels (insns);
3207 timevar_pop (TV_JUMP);
3209 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3212 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3213 timevar_pop (TV_COMBINE);
3218 /* Rerun if-conversion, as combine may have simplified things enough to
3219 now meet sequence length restrictions. */
3220 if (flag_if_conversion)
3222 timevar_push (TV_IFCVT);
3223 open_dump_file (DFI_ce2, decl);
3229 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3230 timevar_pop (TV_IFCVT);
3233 /* Register allocation pre-pass, to reduce number of moves
3234 necessary for two-address machines. */
3235 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3237 timevar_push (TV_REGMOVE);
3238 open_dump_file (DFI_regmove, decl);
3240 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3242 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3243 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3244 timevar_pop (TV_REGMOVE);
3249 /* Do unconditional splitting before register allocation to allow machine
3250 description to add extra information not needed previously. */
3251 split_all_insns (1);
3253 #ifdef OPTIMIZE_MODE_SWITCHING
3254 timevar_push (TV_MODE_SWITCH);
3257 optimize_mode_switching (NULL);
3260 timevar_pop (TV_MODE_SWITCH);
3263 /* Any of the several passes since flow1 will have munged register
3264 lifetime data a bit. We need it to be up to date for scheduling
3265 (see handling of reg_known_equiv in init_alias_analysis). */
3266 recompute_reg_usage (insns, !optimize_size);
3268 timevar_push (TV_SCHED);
3270 #ifdef INSN_SCHEDULING
3272 /* Print function header into sched dump now
3273 because doing the sched analysis makes some of the dump. */
3274 if (optimize > 0 && flag_schedule_insns)
3276 open_dump_file (DFI_sched, decl);
3278 /* Do control and data sched analysis,
3279 and write some of the results to dump file. */
3281 schedule_insns (rtl_dump_file);
3283 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3286 timevar_pop (TV_SCHED);
3290 /* Determine if the current function is a leaf before running reload
3291 since this can impact optimizations done by the prologue and
3292 epilogue thus changing register elimination offsets. */
3293 current_function_is_leaf = leaf_function_p ();
3295 timevar_push (TV_LOCAL_ALLOC);
3296 open_dump_file (DFI_lreg, decl);
3298 /* Allocate pseudo-regs that are used only within 1 basic block.
3300 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3301 jump optimizer after register allocation and reloading are finished. */
3303 if (flag_new_regalloc)
3305 delete_trivially_dead_insns (insns, max_reg_num ());
3308 timevar_pop (TV_LOCAL_ALLOC);
3309 if (dump_file[DFI_lreg].enabled)
3311 timevar_push (TV_DUMP);
3313 close_dump_file (DFI_lreg, NULL, NULL);
3314 timevar_pop (TV_DUMP);
3317 /* XXX clean up the whole mess to bring live info in shape again. */
3318 timevar_push (TV_GLOBAL_ALLOC);
3319 open_dump_file (DFI_greg, decl);
3321 build_insn_chain (insns);
3322 failure = reload (insns, 0);
3324 timevar_pop (TV_GLOBAL_ALLOC);
3326 if (dump_file[DFI_greg].enabled)
3328 timevar_push (TV_DUMP);
3330 dump_global_regs (rtl_dump_file);
3332 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3333 timevar_pop (TV_DUMP);
3337 goto exit_rest_of_compilation;
3338 reload_completed = 1;
3339 rebuild_label_notes_after_reload = 0;
3343 /* Allocate the reg_renumber array. */
3344 allocate_reg_info (max_regno, FALSE, TRUE);
3346 /* And the reg_equiv_memory_loc array. */
3347 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3349 allocate_initial_values (reg_equiv_memory_loc);
3351 regclass (insns, max_reg_num (), rtl_dump_file);
3352 rebuild_label_notes_after_reload = local_alloc ();
3354 timevar_pop (TV_LOCAL_ALLOC);
3356 if (dump_file[DFI_lreg].enabled)
3358 timevar_push (TV_DUMP);
3360 dump_flow_info (rtl_dump_file);
3361 dump_local_alloc (rtl_dump_file);
3363 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3364 timevar_pop (TV_DUMP);
3369 timevar_push (TV_GLOBAL_ALLOC);
3370 open_dump_file (DFI_greg, decl);
3372 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3373 pass fixing up any insns that are invalid. */
3376 failure = global_alloc (rtl_dump_file);
3379 build_insn_chain (insns);
3380 failure = reload (insns, 0);
3383 timevar_pop (TV_GLOBAL_ALLOC);
3385 if (dump_file[DFI_greg].enabled)
3387 timevar_push (TV_DUMP);
3389 dump_global_regs (rtl_dump_file);
3391 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3392 timevar_pop (TV_DUMP);
3396 goto exit_rest_of_compilation;
3401 open_dump_file (DFI_postreload, decl);
3403 /* Do a very simple CSE pass over just the hard registers. */
3406 timevar_push (TV_RELOAD_CSE_REGS);
3407 reload_cse_regs (insns);
3408 timevar_pop (TV_RELOAD_CSE_REGS);
3411 /* Register allocation and reloading may have turned an indirect jump into
3412 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3413 jumping instructions. */
3414 if (rebuild_label_notes_after_reload)
3416 timevar_push (TV_JUMP);
3418 rebuild_jump_labels (insns);
3419 purge_all_dead_edges (0);
3421 timevar_pop (TV_JUMP);
3424 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3426 /* Re-create the death notes which were deleted during reload. */
3427 timevar_push (TV_FLOW2);
3428 open_dump_file (DFI_flow2, decl);
3430 #ifdef ENABLE_CHECKING
3431 verify_flow_info ();
3434 /* If optimizing, then go ahead and split insns now. */
3436 split_all_insns (0);
3438 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3440 /* On some machines, the prologue and epilogue code, or parts thereof,
3441 can be represented as RTL. Doing so lets us schedule insns between
3442 it and the rest of the code and also allows delayed branch
3443 scheduling to operate in the epilogue. */
3444 thread_prologue_and_epilogue_insns (insns);
3448 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3449 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3450 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3452 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3453 even for machines with possibly nonzero RETURN_POPS_ARGS
3454 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3455 push instructions will have popping returns. */
3456 #ifndef PUSH_ROUNDING
3457 if (!ACCUMULATE_OUTGOING_ARGS)
3459 combine_stack_adjustments ();
3464 flow2_completed = 1;
3466 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3467 timevar_pop (TV_FLOW2);
3469 #ifdef HAVE_peephole2
3470 if (optimize > 0 && flag_peephole2)
3472 timevar_push (TV_PEEPHOLE2);
3473 open_dump_file (DFI_peephole2, decl);
3475 peephole2_optimize (rtl_dump_file);
3477 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3478 timevar_pop (TV_PEEPHOLE2);
3482 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3484 timevar_push (TV_RENAME_REGISTERS);
3485 open_dump_file (DFI_rnreg, decl);
3487 if (flag_rename_registers)
3488 regrename_optimize ();
3489 if (flag_cprop_registers)
3490 copyprop_hardreg_forward ();
3492 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3493 timevar_pop (TV_RENAME_REGISTERS);
3496 if (flag_if_conversion2)
3498 timevar_push (TV_IFCVT2);
3499 open_dump_file (DFI_ce3, decl);
3503 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3504 timevar_pop (TV_IFCVT2);
3508 split_all_insns (1);
3511 #ifdef INSN_SCHEDULING
3512 if (optimize > 0 && flag_schedule_insns_after_reload)
3514 timevar_push (TV_SCHED2);
3515 open_dump_file (DFI_sched2, decl);
3517 /* Do control and data sched analysis again,
3518 and write some more of the results to dump file. */
3520 split_all_insns (1);
3522 schedule_insns (rtl_dump_file);
3524 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3525 timevar_pop (TV_SCHED2);
3531 #ifdef LEAF_REGISTERS
3532 current_function_uses_only_leaf_regs
3533 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3537 timevar_push (TV_REG_STACK);
3538 open_dump_file (DFI_stack, decl);
3540 reg_to_stack (insns, rtl_dump_file);
3542 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3543 timevar_pop (TV_REG_STACK);
3549 timevar_push (TV_REORDER_BLOCKS);
3550 open_dump_file (DFI_bbro, decl);
3552 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3553 splitting possibly introduced more crossjumping opportunities.
3554 Except that we can't actually run crossjumping without running
3555 another DCE pass, which we can't do after reg-stack. */
3556 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3557 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3558 if (flag_reorder_blocks)
3560 reorder_basic_blocks ();
3561 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3564 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3565 timevar_pop (TV_REORDER_BLOCKS);
3567 compute_alignments ();
3569 /* CFG is no longer maintained up-to-date. */
3570 free_bb_for_insn ();
3572 /* If a machine dependent reorganization is needed, call it. */
3573 #ifdef MACHINE_DEPENDENT_REORG
3574 timevar_push (TV_MACH_DEP);
3575 open_dump_file (DFI_mach, decl);
3577 MACHINE_DEPENDENT_REORG (insns);
3579 close_dump_file (DFI_mach, print_rtl, insns);
3580 timevar_pop (TV_MACH_DEP);
3585 purge_line_number_notes (insns);
3586 cleanup_barriers ();
3588 /* If a scheduling pass for delayed branches is to be done,
3589 call the scheduling code. */
3592 if (optimize > 0 && flag_delayed_branch)
3594 timevar_push (TV_DBR_SCHED);
3595 open_dump_file (DFI_dbr, decl);
3597 dbr_schedule (insns, rtl_dump_file);
3599 close_dump_file (DFI_dbr, print_rtl, insns);
3600 timevar_pop (TV_DBR_SCHED);
3606 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3607 timevar_push (TV_SHORTEN_BRANCH);
3608 split_all_insns_noflow ();
3609 timevar_pop (TV_SHORTEN_BRANCH);
3612 convert_to_eh_region_ranges ();
3614 /* Shorten branches. */
3615 timevar_push (TV_SHORTEN_BRANCH);
3616 shorten_branches (get_insns ());
3617 timevar_pop (TV_SHORTEN_BRANCH);
3619 set_nothrow_function_flags ();
3620 if (current_function_nothrow)
3621 /* Now we know that this can't throw; set the flag for the benefit
3622 of other functions later in this translation unit. */
3623 TREE_NOTHROW (current_function_decl) = 1;
3625 /* Now turn the rtl into assembler code. */
3627 timevar_push (TV_FINAL);
3632 /* Get the function's name, as described by its RTL. This may be
3633 different from the DECL_NAME name used in the source file. */
3635 x = DECL_RTL (decl);
3636 if (GET_CODE (x) != MEM)
3639 if (GET_CODE (x) != SYMBOL_REF)
3641 fnname = XSTR (x, 0);
3643 assemble_start_function (decl, fnname);
3644 final_start_function (insns, asm_out_file, optimize);
3645 final (insns, asm_out_file, optimize, 0);
3646 final_end_function ();
3648 #ifdef IA64_UNWIND_INFO
3649 /* ??? The IA-64 ".handlerdata" directive must be issued before
3650 the ".endp" directive that closes the procedure descriptor. */
3651 output_function_exception_table ();
3654 assemble_end_function (decl, fnname);
3656 #ifndef IA64_UNWIND_INFO
3657 /* Otherwise, it feels unclean to switch sections in the middle. */
3658 output_function_exception_table ();
3662 fflush (asm_out_file);
3664 /* Release all memory allocated by flow. */
3665 free_basic_block_vars (0);
3667 /* Release all memory held by regsets now. */
3668 regset_release_memory ();
3670 timevar_pop (TV_FINAL);
3674 /* Write DBX symbols if requested. */
3676 /* Note that for those inline functions where we don't initially
3677 know for certain that we will be generating an out-of-line copy,
3678 the first invocation of this routine (rest_of_compilation) will
3679 skip over this code by doing a `goto exit_rest_of_compilation;'.
3680 Later on, wrapup_global_declarations will (indirectly) call
3681 rest_of_compilation again for those inline functions that need
3682 to have out-of-line copies generated. During that call, we
3683 *will* be routed past here. */
3685 timevar_push (TV_SYMOUT);
3686 (*debug_hooks->function_decl) (decl);
3687 timevar_pop (TV_SYMOUT);
3689 exit_rest_of_compilation:
3691 /* In case the function was not output,
3692 don't leave any temporary anonymous types
3693 queued up for sdb output. */
3694 #ifdef SDB_DEBUGGING_INFO
3695 if (write_symbols == SDB_DEBUG)
3696 sdbout_types (NULL_TREE);
3699 reload_completed = 0;
3700 flow2_completed = 0;
3703 timevar_push (TV_FINAL);
3705 /* Clear out the insn_length contents now that they are no
3707 init_insn_lengths ();
3709 /* Show no temporary slots allocated. */
3712 free_basic_block_vars (0);
3713 free_bb_for_insn ();
3715 timevar_pop (TV_FINAL);
3717 /* Make sure volatile mem refs aren't considered valid operands for
3718 arithmetic insns. We must call this here if this is a nested inline
3719 function, since the above code leaves us in the init_recog state
3720 (from final.c), and the function context push/pop code does not
3721 save/restore volatile_ok.
3723 ??? Maybe it isn't necessary for expand_start_function to call this
3724 anymore if we do it here? */
3726 init_recog_no_volatile ();
3728 /* We're done with this function. Free up memory if we can. */
3729 free_after_parsing (cfun);
3730 if (! DECL_DEFER_OUTPUT (decl))
3732 free_after_compilation (cfun);
3734 /* Clear integrate.c's pointer to the cfun structure we just
3736 DECL_SAVED_INSNS (decl) = 0;
3742 timevar_pop (TV_REST_OF_COMPILATION);
3752 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3753 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3754 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3755 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3756 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3757 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"));
3758 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3760 for (i = ARRAY_SIZE (f_options); i--;)
3762 const char *description = f_options[i].description;
3764 if (description != NULL && *description != 0)
3765 printf (" -f%-21s %s\n",
3766 f_options[i].string, _(description));
3769 printf (_(" -O[number] Set optimization level to [number]\n"));
3770 printf (_(" -Os Optimize for space rather than speed\n"));
3771 for (i = LAST_PARAM; i--;)
3773 const char *description = compiler_params[i].help;
3774 const int length = 21 - strlen (compiler_params[i].option);
3776 if (description != NULL && *description != 0)
3777 printf (" --param %s=<value>%.*s%s\n",
3778 compiler_params[i].option,
3779 length > 0 ? length : 1, " ",
3782 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3783 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3784 printf (_(" -w Suppress warnings\n"));
3786 for (i = ARRAY_SIZE (W_options); i--;)
3788 const char *description = W_options[i].description;
3790 if (description != NULL && *description != 0)
3791 printf (" -W%-21s %s\n",
3792 W_options[i].string, _(description));
3795 printf (_(" -Wunused Enable unused warnings\n"));
3796 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3797 printf (_(" -p Enable function profiling\n"));
3798 printf (_(" -o <file> Place output into <file> \n"));
3800 -G <number> Put global and static data smaller than <number>\n\
3801 bytes into a special section (on some targets)\n"));
3803 for (i = ARRAY_SIZE (debug_args); i--;)
3805 if (debug_args[i].description != NULL)
3806 printf (" -g%-21s %s\n",
3807 debug_args[i].arg, _(debug_args[i].description));
3810 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3811 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3812 printf (_(" -version Display the compiler's version\n"));
3813 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3814 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3815 #if defined INSN_SCHEDULING
3816 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3818 printf (_(" --help Display this information\n"));
3823 /* Display descriptions of language specific options.
3824 If there is no description, note that there is an undocumented option.
3825 If the description is empty, do not display anything. (This allows
3826 options to be deliberately undocumented, for whatever reason).
3827 If the option string is missing, then this is a marker, indicating
3828 that the description string is in fact the name of a language, whose
3829 language specific options are to follow. */
3831 if (ARRAY_SIZE (documented_lang_options) > 1)
3833 printf (_("\nLanguage specific options:\n"));
3835 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3837 const char *description = documented_lang_options[i].description;
3838 const char *option = documented_lang_options[i].option;
3840 if (description == NULL)
3845 printf (_(" %-23.23s [undocumented]\n"), option);
3847 else if (*description == 0)
3849 else if (option == NULL)
3853 (_("\nThere are undocumented %s specific options as well.\n"),
3857 printf (_("\n Options for %s:\n"), description);
3862 printf (" %-23.23s %s\n", option, _(description));
3867 printf (_("\nThere are undocumented %s specific options as well.\n"),
3870 display_target_options ();
3874 display_target_options ()
3877 static bool displayed = false;
3879 /* Avoid double printing for --help --target-help. */
3884 if (ARRAY_SIZE (target_switches) > 1
3885 #ifdef TARGET_OPTIONS
3886 || ARRAY_SIZE (target_options) > 1
3894 printf (_("\nTarget specific options:\n"));
3896 for (i = ARRAY_SIZE (target_switches); i--;)
3898 const char *option = target_switches[i].name;
3899 const char *description = target_switches[i].description;
3901 if (option == NULL || *option == 0)
3903 else if (description == NULL)
3908 printf (_(" -m%-23.23s [undocumented]\n"), option);
3910 else if (*description != 0)
3911 doc += printf (" -m%-23.23s %s\n", option, _(description));
3914 #ifdef TARGET_OPTIONS
3915 for (i = ARRAY_SIZE (target_options); i--;)
3917 const char *option = target_options[i].prefix;
3918 const char *description = target_options[i].description;
3920 if (option == NULL || *option == 0)
3922 else if (description == NULL)
3927 printf (_(" -m%-23.23s [undocumented]\n"), option);
3929 else if (*description != 0)
3930 doc += printf (" -m%-23.23s %s\n", option, _(description));
3936 printf (_("\nThere are undocumented target specific options as well.\n"));
3938 printf (_(" They exist, but they are not documented.\n"));
3943 /* Parse a -d... command line switch. */
3946 decode_d_option (arg)
3955 for (i = 0; i < (int) DFI_MAX; ++i)
3956 dump_file[i].enabled = 1;
3962 flag_print_asm_name = 1;
3965 flag_dump_rtl_in_asm = 1;
3966 flag_print_asm_name = 1;
3969 graph_dump_format = vcg;
3972 rtl_dump_and_exit = 1;
3977 case 'D': /* These are handled by the preprocessor. */
3981 setup_core_dumping();
3986 for (i = 0; i < (int) DFI_MAX; ++i)
3987 if (c == dump_file[i].debug_switch)
3989 dump_file[i].enabled = 1;
3994 warning ("unrecognized gcc debugging option: %c", c);
3999 /* Parse a -f... command line switch. ARG is the value after the -f.
4000 It is safe to access 'ARG - 2' to generate the full switch name.
4001 Return the number of strings consumed. */
4004 decode_f_option (arg)
4008 const char *option_value = NULL;
4010 /* Search for the option in the table of binary f options. */
4011 for (j = ARRAY_SIZE (f_options); j--;)
4013 if (!strcmp (arg, f_options[j].string))
4015 *f_options[j].variable = f_options[j].on_value;
4019 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4020 && ! strcmp (arg + 3, f_options[j].string))
4022 *f_options[j].variable = ! f_options[j].on_value;
4027 if (!strcmp (arg, "fast-math"))
4028 set_fast_math_flags (1);
4029 else if (!strcmp (arg, "no-fast-math"))
4030 set_fast_math_flags (0);
4031 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4032 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4035 read_integral_parameter (option_value, arg - 2,
4037 set_param_value ("max-inline-insns", val);
4039 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4041 if (strcmp (option_value, "global-dynamic") == 0)
4042 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4043 else if (strcmp (option_value, "local-dynamic") == 0)
4044 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4045 else if (strcmp (option_value, "initial-exec") == 0)
4046 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4047 else if (strcmp (option_value, "local-exec") == 0)
4048 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4050 warning ("`%s': unknown tls-model option", arg - 2);
4052 #ifdef INSN_SCHEDULING
4053 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4054 fix_sched_param ("verbose", option_value);
4056 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4057 fix_register (option_value, 1, 1);
4058 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4059 fix_register (option_value, 0, 1);
4060 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4061 fix_register (option_value, 0, 0);
4062 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4063 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4064 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4066 = read_integral_parameter (option_value, arg - 2, align_functions);
4067 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4068 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4069 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4071 = read_integral_parameter (option_value, arg - 2, align_labels);
4072 else if ((option_value
4073 = skip_leading_substring (arg, "stack-limit-register=")))
4075 int reg = decode_reg_name (option_value);
4077 error ("unrecognized register name `%s'", option_value);
4079 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4081 else if ((option_value
4082 = skip_leading_substring (arg, "stack-limit-symbol=")))
4085 nm = ggc_strdup (option_value);
4086 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4088 else if ((option_value
4089 = skip_leading_substring (arg, "message-length=")))
4090 output_set_maximum_length
4091 (&global_dc->buffer, read_integral_parameter
4092 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4093 else if ((option_value
4094 = skip_leading_substring (arg, "diagnostics-show-location=")))
4096 if (!strcmp (option_value, "once"))
4097 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4098 else if (!strcmp (option_value, "every-line"))
4099 diagnostic_prefixing_rule (global_dc)
4100 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4102 error ("unrecognized option `%s'", arg - 2);
4104 else if (!strcmp (arg, "no-stack-limit"))
4105 stack_limit_rtx = NULL_RTX;
4106 else if (!strcmp (arg, "preprocessed"))
4107 /* Recognize this switch but do nothing. This prevents warnings
4108 about an unrecognized switch if cpplib has not been linked in. */
4116 /* Parse a -W... command line switch. ARG is the value after the -W.
4117 It is safe to access 'ARG - 2' to generate the full switch name.
4118 Return the number of strings consumed. */
4121 decode_W_option (arg)
4124 const char *option_value = NULL;
4127 /* Search for the option in the table of binary W options. */
4129 for (j = ARRAY_SIZE (W_options); j--;)
4131 if (!strcmp (arg, W_options[j].string))
4133 *W_options[j].variable = W_options[j].on_value;
4137 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4138 && ! strcmp (arg + 3, W_options[j].string))
4140 *W_options[j].variable = ! W_options[j].on_value;
4145 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4146 warning ("-Wid-clash-LEN is no longer supported");
4147 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4149 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4151 warn_larger_than = larger_than_size != -1;
4153 else if (!strcmp (arg, "unused"))
4157 else if (!strcmp (arg, "no-unused"))
4161 else if (!strcmp (arg, "extra"))
4163 /* We save the value of warn_uninitialized, since if they put
4164 -Wuninitialized on the command line, we need to generate a
4165 warning about not using it without also specifying -O. */
4166 if (warn_uninitialized != 1)
4167 warn_uninitialized = 2;
4175 /* Parse a -g... command line switch. ARG is the value after the -g.
4176 It is safe to access 'ARG - 2' to generate the full switch name.
4177 Return the number of strings consumed. */
4180 decode_g_option (arg)
4183 static unsigned level = 0;
4184 /* A lot of code assumes write_symbols == NO_DEBUG if the
4185 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4186 of what debugging type has been selected). This records the
4187 selected type. It is an error to specify more than one
4189 static enum debug_info_type selected_debug_type = NO_DEBUG;
4190 /* Nonzero if debugging format has been explicitly set.
4191 -g and -ggdb don't explicitly set the debugging format so
4192 -gdwarf -g3 is equivalent to -gdwarf3. */
4193 static int type_explicitly_set_p = 0;
4194 /* Indexed by enum debug_info_type. */
4195 static const char *const debug_type_names[] =
4197 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4200 /* The maximum admissible debug level value. */
4201 static const unsigned max_debug_level = 3;
4203 /* Look up ARG in the table. */
4204 for (da = debug_args; da->arg; da++)
4206 const int da_len = strlen (da->arg);
4208 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4210 enum debug_info_type type = da->debug_type;
4211 const char *p = arg + da_len;
4213 if (*p && ! ISDIGIT (*p))
4216 /* A debug flag without a level defaults to level 2.
4217 Note we do not want to call read_integral_parameter
4218 for that case since it will call atoi which
4221 ??? We may want to generalize the interface to
4222 read_integral_parameter to better handle this case
4223 if this case shows up often. */
4225 level = read_integral_parameter (p, 0, max_debug_level + 1);
4227 level = (level == 0) ? 2 : level;
4229 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4231 error ("use -gdwarf -g%d for DWARF v1, level %d",
4234 error ("use -gdwarf-2 for DWARF v2");
4237 if (level > max_debug_level)
4240 ignoring option `%s' due to invalid debug level specification",
4242 level = debug_info_level;
4245 if (type == NO_DEBUG)
4247 type = PREFERRED_DEBUGGING_TYPE;
4249 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4251 #ifdef DWARF2_DEBUGGING_INFO
4252 type = DWARF2_DEBUG;
4254 #ifdef DBX_DEBUGGING_INFO
4261 if (type == NO_DEBUG)
4262 warning ("`%s': unknown or unsupported -g option", arg - 2);
4264 /* Does it conflict with an already selected type? */
4265 if (type_explicitly_set_p
4266 /* -g/-ggdb don't conflict with anything. */
4267 && da->debug_type != NO_DEBUG
4268 && type != selected_debug_type)
4269 warning ("`%s' ignored, conflicts with `-g%s'",
4270 arg - 2, debug_type_names[(int) selected_debug_type]);
4273 /* If the format has already been set, -g/-ggdb
4274 only change the debug level. */
4275 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4276 /* Don't change debugging type. */
4280 selected_debug_type = type;
4281 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4284 write_symbols = (level == 0
4286 : selected_debug_type);
4287 use_gnu_debug_info_extensions = da->use_extensions_p;
4288 debug_info_level = (enum debug_info_level) level;
4301 /* Decode the first argument in the argv as a language-independent option.
4302 Return the number of strings consumed. */
4305 independent_decode_option (argc, argv)
4309 char *arg = argv[0];
4311 if (arg[0] != '-' || arg[1] == 0)
4323 if (!strcmp (arg, "-help"))
4326 exit_after_options = 1;
4329 if (!strcmp (arg, "-target-help"))
4331 display_target_options ();
4332 exit_after_options = 1;
4335 if (!strcmp (arg, "-version"))
4337 print_version (stderr, "");
4338 exit_after_options = 1;
4341 /* Handle '--param <name>=<value>'. */
4342 if (strcmp (arg, "-param") == 0)
4348 error ("-param option missing argument");
4352 /* Get the '<name>=<value>' parameter. */
4354 /* Look for the `='. */
4355 equal = strchr (arg, '=');
4357 error ("invalid --param option: %s", arg);
4362 /* Zero out the `=' sign so that we get two separate strings. */
4364 /* Figure out what value is specified. */
4365 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4366 if (val != INVALID_PARAM_VAL)
4367 set_param_value (arg, val);
4369 error ("invalid parameter value `%s'", equal + 1);
4384 /* Already been treated in main (). Do nothing. */
4388 set_target_switch (arg + 1);
4392 return decode_f_option (arg + 1);
4395 return decode_g_option (arg + 1);
4398 if (!strcmp (arg, "dumpbase"))
4404 dump_base_name = argv[1];
4409 decode_d_option (arg + 1);
4413 if (!strcmp (arg, "pedantic"))
4415 else if (!strcmp (arg, "pedantic-errors"))
4416 flag_pedantic_errors = pedantic = 1;
4417 else if (arg[1] == 0)
4424 if (!strcmp (arg, "quiet"))
4431 if (!strcmp (arg, "version"))
4439 inhibit_warnings = 1;
4448 /* We save the value of warn_uninitialized, since if they put
4449 -Wuninitialized on the command line, we need to generate a
4450 warning about not using it without also specifying -O. */
4451 if (warn_uninitialized != 1)
4452 warn_uninitialized = 2;
4455 return decode_W_option (arg + 1);
4459 if (!strncmp (arg, "aux-info", 8))
4466 aux_info_file_name = argv[1];
4467 flag_gen_aux_info = 1;
4470 else if (arg[8] == '=')
4472 aux_info_file_name = arg + 9;
4473 flag_gen_aux_info = 1;
4478 else if (!strcmp (arg, "auxbase"))
4484 aux_base_name = argv[1];
4488 else if (!strcmp (arg, "auxbase-strip"))
4495 strip_off_ending (argv[1], strlen (argv[1]));
4497 aux_base_name = argv[1];
4512 asm_file_name = argv[1];
4527 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4532 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4536 if (g_switch_val == -1)
4540 g_switch_set = TRUE;
4541 g_switch_value = g_switch_val;
4551 /* Decode -m switches. */
4552 /* Decode the switch -mNAME. */
4555 set_target_switch (name)
4559 int valid_target_option = 0;
4561 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4562 if (!strcmp (target_switches[j].name, name))
4564 if (target_switches[j].value < 0)
4565 target_flags &= ~-target_switches[j].value;
4567 target_flags |= target_switches[j].value;
4570 if (target_switches[j].value < 0)
4571 target_flags_explicit |= -target_switches[j].value;
4573 target_flags_explicit |= target_switches[j].value;
4575 valid_target_option = 1;
4578 #ifdef TARGET_OPTIONS
4579 if (!valid_target_option)
4580 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4582 int len = strlen (target_options[j].prefix);
4583 if (!strncmp (target_options[j].prefix, name, len))
4585 *target_options[j].variable = name + len;
4586 valid_target_option = 1;
4591 if (!valid_target_option)
4592 error ("invalid option `%s'", name);
4595 /* Print version information to FILE.
4596 Each line begins with INDENT (for the case where FILE is the
4597 assembler output file). */
4600 print_version (file, indent)
4605 #define __VERSION__ "[?]"
4609 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4611 "%s%s%s version %s (%s) compiled by CC.\n"
4613 , indent, *indent != 0 ? " " : "",
4614 lang_hooks.name, version_string, TARGET_NAME,
4615 indent, __VERSION__);
4618 /* Print an option value and return the adjusted position in the line.
4619 ??? We don't handle error returns from fprintf (disk full); presumably
4620 other code will catch a disk full though. */
4623 print_single_switch (file, pos, max, indent, sep, term, type, name)
4626 const char *indent, *sep, *term, *type, *name;
4628 /* The ultrix fprintf returns 0 on success, so compute the result we want
4629 here since we need it for the following test. */
4630 int len = strlen (sep) + strlen (type) + strlen (name);
4635 fprintf (file, "%s", term);
4640 fprintf (file, "%s", indent);
4641 pos = strlen (indent);
4643 fprintf (file, "%s%s%s", sep, type, name);
4648 /* Print active target switches to FILE.
4649 POS is the current cursor position and MAX is the size of a "line".
4650 Each line begins with INDENT and ends with TERM.
4651 Each switch is separated from the next by SEP. */
4654 print_switch_values (file, pos, max, indent, sep, term)
4657 const char *indent, *sep, *term;
4662 /* Print the options as passed. */
4664 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4665 _("options passed: "), "");
4667 for (p = &save_argv[1]; *p != NULL; p++)
4671 if (strcmp (*p, "-o") == 0)
4677 if (strcmp (*p, "-quiet") == 0)
4679 if (strcmp (*p, "-version") == 0)
4684 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4687 fprintf (file, "%s", term);
4689 /* Print the -f and -m options that have been enabled.
4690 We don't handle language specific options but printing argv
4693 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4694 _("options enabled: "), "");
4696 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4697 if (*f_options[j].variable == f_options[j].on_value)
4698 pos = print_single_switch (file, pos, max, indent, sep, term,
4699 "-f", f_options[j].string);
4701 /* Print target specific options. */
4703 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4704 if (target_switches[j].name[0] != '\0'
4705 && target_switches[j].value > 0
4706 && ((target_switches[j].value & target_flags)
4707 == target_switches[j].value))
4709 pos = print_single_switch (file, pos, max, indent, sep, term,
4710 "-m", target_switches[j].name);
4713 #ifdef TARGET_OPTIONS
4714 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4715 if (*target_options[j].variable != NULL)
4718 sprintf (prefix, "-m%s", target_options[j].prefix);
4719 pos = print_single_switch (file, pos, max, indent, sep, term,
4720 prefix, *target_options[j].variable);
4724 fprintf (file, "%s", term);
4727 /* Open assembly code output file. Do this even if -fsyntax-only is
4728 on, because then the driver will have provided the name of a
4729 temporary file or bit bucket for us. NAME is the file specified on
4730 the command line, possibly NULL. */
4732 init_asm_output (name)
4735 if (name == NULL && asm_file_name == 0)
4736 asm_out_file = stdout;
4739 if (asm_file_name == 0)
4741 int len = strlen (dump_base_name);
4742 char *dumpname = (char *) xmalloc (len + 6);
4743 memcpy (dumpname, dump_base_name, len + 1);
4744 strip_off_ending (dumpname, len);
4745 strcat (dumpname, ".s");
4746 asm_file_name = dumpname;
4748 if (!strcmp (asm_file_name, "-"))
4749 asm_out_file = stdout;
4751 asm_out_file = fopen (asm_file_name, "w+");
4752 if (asm_out_file == 0)
4753 fatal_io_error ("can't open %s for writing", asm_file_name);
4756 #ifdef IO_BUFFER_SIZE
4757 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4758 _IOFBF, IO_BUFFER_SIZE);
4761 if (!flag_syntax_only)
4763 #ifdef ASM_FILE_START
4764 ASM_FILE_START (asm_out_file);
4767 #ifdef ASM_COMMENT_START
4768 if (flag_verbose_asm)
4770 /* Print the list of options in effect. */
4771 print_version (asm_out_file, ASM_COMMENT_START);
4772 print_switch_values (asm_out_file, 0, MAX_LINE,
4773 ASM_COMMENT_START, " ", "\n");
4774 /* Add a blank line here so it appears in assembler output but not
4776 fprintf (asm_out_file, "\n");
4782 /* Initialization of the front end environment, before command line
4783 options are parsed. Signal handlers, internationalization etc.
4784 ARGV0 is main's argv[0]. */
4786 general_init (argv0)
4791 p = argv0 + strlen (argv0);
4792 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4796 xmalloc_set_program_name (progname);
4800 gcc_init_libintl ();
4802 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4804 signal (SIGSEGV, crash_signal);
4807 signal (SIGILL, crash_signal);
4810 signal (SIGBUS, crash_signal);
4813 signal (SIGABRT, crash_signal);
4815 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4816 signal (SIGIOT, crash_signal);
4819 signal (SIGFPE, crash_signal);
4822 /* Other host-specific signal setup. */
4823 (*host_hooks.extra_signals)();
4825 /* Initialize the diagnostics reporting machinery, so option parsing
4826 can give warnings and errors. */
4827 diagnostic_initialize (global_dc);
4829 /* Initialize the garbage-collector, string pools and tree type hash
4836 /* Parse command line options and set default flag values, called
4837 after language-independent option-independent initialization. Do
4838 minimal options processing. Outputting diagnostics is OK, but GC
4839 and identifier hashtables etc. are not initialized yet.
4841 Return nonzero to suppress compiler back end initialization. */
4843 parse_options_and_default_flags (argc, argv)
4849 /* Save in case md file wants to emit args as a comment. */
4853 /* Initialize register usage now so switches may override. */
4856 /* Register the language-independent parameters. */
4857 add_params (lang_independent_params, LAST_PARAM);
4859 /* Perform language-specific options initialization. */
4860 (*lang_hooks.init_options) ();
4862 /* Scan to see what optimization level has been specified. That will
4863 determine the default value of many flags. */
4864 for (i = 1; i < argc; i++)
4866 if (!strcmp (argv[i], "-O"))
4871 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4873 /* Handle -Os, -O2, -O3, -O69, ... */
4874 char *p = &argv[i][2];
4876 if ((p[0] == 's') && (p[1] == 0))
4880 /* Optimizing for size forces optimize to be 2. */
4885 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4886 if (optimize_val != -1)
4888 optimize = optimize_val;
4897 flag_merge_constants = 0;
4903 flag_thread_jumps = 1;
4905 flag_delayed_branch = 1;
4907 #ifdef CAN_DEBUG_WITHOUT_FP
4908 flag_omit_frame_pointer = 1;
4910 flag_guess_branch_prob = 1;
4911 flag_cprop_registers = 1;
4912 flag_loop_optimize = 1;
4913 flag_crossjumping = 1;
4914 flag_if_conversion = 1;
4915 flag_if_conversion2 = 1;
4920 flag_optimize_sibling_calls = 1;
4921 flag_cse_follow_jumps = 1;
4922 flag_cse_skip_blocks = 1;
4924 flag_expensive_optimizations = 1;
4925 flag_strength_reduce = 1;
4926 flag_rerun_cse_after_loop = 1;
4927 flag_rerun_loop_opt = 1;
4928 flag_caller_saves = 1;
4931 #ifdef INSN_SCHEDULING
4932 flag_schedule_insns = 1;
4933 flag_schedule_insns_after_reload = 1;
4936 flag_strict_aliasing = 1;
4937 flag_delete_null_pointer_checks = 1;
4938 flag_reorder_blocks = 1;
4939 flag_reorder_functions = 1;
4944 flag_inline_functions = 1;
4945 flag_rename_registers = 1;
4946 flag_unswitch_loops = 1;
4949 if (optimize < 2 || optimize_size)
4954 align_functions = 1;
4956 /* Don't reorder blocks when optimizing for size because extra
4957 jump insns may be created; also barrier may create extra padding.
4959 More correctly we should have a block reordering mode that tried
4960 to minimize the combined size of all the jumps. This would more
4961 or less automatically remove extra jumps, but would also try to
4962 use more short jumps instead of long jumps. */
4963 flag_reorder_blocks = 0;
4966 /* Initialize whether `char' is signed. */
4967 flag_signed_char = DEFAULT_SIGNED_CHAR;
4968 #ifdef DEFAULT_SHORT_ENUMS
4969 /* Initialize how much space enums occupy, by default. */
4970 flag_short_enums = DEFAULT_SHORT_ENUMS;
4973 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4976 set_target_switch ("");
4978 /* Unwind tables are always present in an ABI-conformant IA-64
4979 object file, so the default should be ON. */
4980 #ifdef IA64_UNWIND_INFO
4981 flag_unwind_tables = IA64_UNWIND_INFO;
4984 #ifdef OPTIMIZATION_OPTIONS
4985 /* Allow default optimizations to be specified on a per-machine basis. */
4986 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4989 /* Perform normal command line switch decoding. */
4990 for (i = 1; i < argc;)
4993 int indep_processed;
4995 /* Give the language a chance to decode the option for itself. */
4996 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4998 if (lang_processed >= 0)
4999 /* Now see if the option also has a language independent meaning.
5000 Some options are both language specific and language independent,
5002 indep_processed = independent_decode_option (argc - i, argv + i);
5005 lang_processed = -lang_processed;
5006 indep_processed = 0;
5009 if (lang_processed || indep_processed)
5010 i += MAX (lang_processed, indep_processed);
5013 const char *option = NULL;
5014 const char *lang = NULL;
5017 /* It is possible that the command line switch is not valid for the
5018 current language, but it is valid for another language. In order
5019 to be compatible with previous versions of the compiler (which
5020 did not issue an error message in this case) we check for this
5021 possibility here. If we do find a match, then if extra_warnings
5022 is set we generate a warning message, otherwise we will just
5023 ignore the option. */
5024 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5026 option = documented_lang_options[j].option;
5029 lang = documented_lang_options[j].description;
5030 else if (! strncmp (argv[i], option, strlen (option)))
5034 if (j != ARRAY_SIZE (documented_lang_options))
5038 warning ("ignoring command line option '%s'", argv[i]);
5041 ("(it is valid for %s but not the selected language)",
5045 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5046 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5048 error ("unrecognized option `%s'", argv[i]);
5054 if (flag_no_inline == 2)
5057 flag_really_no_inline = flag_no_inline;
5059 /* Set flag_no_inline before the post_options () hook. The C front
5060 ends use it to determine tree inlining defaults. FIXME: such
5061 code should be lang-independent when all front ends use tree
5062 inlining, in which case it, and this condition, should be moved
5063 to the top of process_options() instead. */
5066 /* Inlining does not work if not optimizing,
5067 so force it not to be done. */
5071 /* The c_decode_option function and decode_option hook set
5072 this to `2' if -Wall is used, so we can avoid giving out
5073 lots of errors for people who don't realize what -Wall does. */
5074 if (warn_uninitialized == 1)
5075 warning ("-Wuninitialized is not supported without -O");
5078 if (flag_really_no_inline == 2)
5079 flag_really_no_inline = flag_no_inline;
5082 /* Process the options that have been parsed. */
5086 #ifdef OVERRIDE_OPTIONS
5087 /* Some machines may reject certain combinations of options. */
5091 /* Set up the align_*_log variables, defaulting them to 1 if they
5092 were still unset. */
5093 if (align_loops <= 0) align_loops = 1;
5094 if (align_loops_max_skip > align_loops || !align_loops)
5095 align_loops_max_skip = align_loops - 1;
5096 align_loops_log = floor_log2 (align_loops * 2 - 1);
5097 if (align_jumps <= 0) align_jumps = 1;
5098 if (align_jumps_max_skip > align_jumps || !align_jumps)
5099 align_jumps_max_skip = align_jumps - 1;
5100 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5101 if (align_labels <= 0) align_labels = 1;
5102 align_labels_log = floor_log2 (align_labels * 2 - 1);
5103 if (align_labels_max_skip > align_labels || !align_labels)
5104 align_labels_max_skip = align_labels - 1;
5105 if (align_functions <= 0) align_functions = 1;
5106 align_functions_log = floor_log2 (align_functions * 2 - 1);
5108 /* Unrolling all loops implies that standard loop unrolling must also
5110 if (flag_unroll_all_loops)
5111 flag_unroll_loops = 1;
5112 /* Loop unrolling requires that strength_reduction be on also. Silently
5113 turn on strength reduction here if it isn't already on. Also, the loop
5114 unrolling code assumes that cse will be run after loop, so that must
5115 be turned on also. */
5116 if (flag_unroll_loops)
5118 flag_strength_reduce = 1;
5119 flag_rerun_cse_after_loop = 1;
5122 if (flag_non_call_exceptions)
5123 flag_asynchronous_unwind_tables = 1;
5124 if (flag_asynchronous_unwind_tables)
5125 flag_unwind_tables = 1;
5127 /* Warn about options that are not supported on this machine. */
5128 #ifndef INSN_SCHEDULING
5129 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5130 warning ("instruction scheduling not supported on this target machine");
5133 if (flag_delayed_branch)
5134 warning ("this target machine does not have delayed branches");
5137 user_label_prefix = USER_LABEL_PREFIX;
5138 if (flag_leading_underscore != -1)
5140 /* If the default prefix is more complicated than "" or "_",
5141 issue a warning and ignore this option. */
5142 if (user_label_prefix[0] == 0 ||
5143 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5145 user_label_prefix = flag_leading_underscore ? "_" : "";
5148 warning ("-f%sleading-underscore not supported on this target machine",
5149 flag_leading_underscore ? "" : "no-");
5152 /* If we are in verbose mode, write out the version and maybe all the
5153 option flags in use. */
5156 print_version (stderr, "");
5158 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5164 if (flag_syntax_only)
5166 write_symbols = NO_DEBUG;
5170 /* Now we know write_symbols, set up the debug hooks based on it.
5171 By default we do nothing for debug output. */
5172 #if defined(DBX_DEBUGGING_INFO)
5173 if (write_symbols == DBX_DEBUG)
5174 debug_hooks = &dbx_debug_hooks;
5176 #if defined(XCOFF_DEBUGGING_INFO)
5177 if (write_symbols == XCOFF_DEBUG)
5178 debug_hooks = &xcoff_debug_hooks;
5180 #ifdef SDB_DEBUGGING_INFO
5181 if (write_symbols == SDB_DEBUG)
5182 debug_hooks = &sdb_debug_hooks;
5184 #ifdef DWARF_DEBUGGING_INFO
5185 if (write_symbols == DWARF_DEBUG)
5186 debug_hooks = &dwarf_debug_hooks;
5188 #ifdef DWARF2_DEBUGGING_INFO
5189 if (write_symbols == DWARF2_DEBUG)
5190 debug_hooks = &dwarf2_debug_hooks;
5192 #ifdef VMS_DEBUGGING_INFO
5193 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5194 debug_hooks = &vmsdbg_debug_hooks;
5197 /* If auxiliary info generation is desired, open the output file.
5198 This goes in the same directory as the source file--unlike
5199 all the other output files. */
5200 if (flag_gen_aux_info)
5202 aux_info_file = fopen (aux_info_file_name, "w");
5203 if (aux_info_file == 0)
5204 fatal_io_error ("can't open %s", aux_info_file_name);
5207 if (! targetm.have_named_sections)
5209 if (flag_function_sections)
5211 warning ("-ffunction-sections not supported for this target");
5212 flag_function_sections = 0;
5214 if (flag_data_sections)
5216 warning ("-fdata-sections not supported for this target");
5217 flag_data_sections = 0;
5221 if (flag_function_sections && profile_flag)
5223 warning ("-ffunction-sections disabled; it makes profiling impossible");
5224 flag_function_sections = 0;
5227 #ifndef HAVE_prefetch
5228 if (flag_prefetch_loop_arrays)
5230 warning ("-fprefetch-loop-arrays not supported for this target");
5231 flag_prefetch_loop_arrays = 0;
5234 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5236 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5237 flag_prefetch_loop_arrays = 0;
5241 /* This combination of options isn't handled for i386 targets and doesn't
5242 make much sense anyway, so don't allow it. */
5243 if (flag_prefetch_loop_arrays && optimize_size)
5245 warning ("-fprefetch-loop-arrays is not supported with -Os");
5246 flag_prefetch_loop_arrays = 0;
5249 #ifndef OBJECT_FORMAT_ELF
5250 if (flag_function_sections && write_symbols != NO_DEBUG)
5251 warning ("-ffunction-sections may affect debugging on some targets");
5254 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5255 if (flag_signaling_nans)
5256 flag_trapping_math = 1;
5259 /* Initialize the compiler back end. */
5263 /* init_emit_once uses reg_raw_mode and therefore must be called
5264 after init_regs which initialized reg_raw_mode. */
5266 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5267 || debug_info_level == DINFO_LEVEL_VERBOSE
5268 #ifdef VMS_DEBUGGING_INFO
5269 /* Enable line number info for traceback */
5270 || debug_info_level > DINFO_LEVEL_NONE
5272 || flag_test_coverage
5273 || warn_notreached);
5274 init_fake_stack_mems ();
5278 init_function_once ();
5279 init_varasm_once ();
5281 /* The following initialization functions need to generate rtl, so
5282 provide a dummy function context for them. */
5283 init_dummy_function_start ();
5285 if (flag_caller_saves)
5286 init_caller_save ();
5287 expand_dummy_function_end ();
5290 /* Language-dependent initialization. Returns nonzero on success. */
5292 lang_dependent_init (name)
5295 if (dump_base_name == 0)
5296 dump_base_name = name ? name : "gccdump";
5298 /* Front-end initialization. This hook can assume that GC,
5299 identifier hashes etc. are set up, but debug initialization is
5300 not done yet. This routine must return the original filename
5301 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5302 name = (*lang_hooks.init) (name);
5306 /* Is this duplication necessary? */
5307 name = ggc_strdup (name);
5308 main_input_filename = input_filename = name;
5309 init_asm_output (name);
5311 /* These create various _DECL nodes, so need to be called after the
5312 front end is initialized. */
5316 /* The following initialization functions need to generate rtl, so
5317 provide a dummy function context for them. */
5318 init_dummy_function_start ();
5320 expand_dummy_function_end ();
5322 /* Put an entry on the input file stack for the main input file. */
5323 push_srcloc (input_filename, 0);
5325 /* If dbx symbol table desired, initialize writing it and output the
5326 predefined types. */
5327 timevar_push (TV_SYMOUT);
5329 #ifdef DWARF2_UNWIND_INFO
5330 if (dwarf2out_do_frame ())
5331 dwarf2out_frame_init ();
5334 /* Now we have the correct original filename, we can initialize
5336 (*debug_hooks->init) (name);
5338 timevar_pop (TV_SYMOUT);
5343 /* Clean up: close opened files, etc. */
5348 /* Close the dump files. */
5349 if (flag_gen_aux_info)
5351 fclose (aux_info_file);
5353 unlink (aux_info_file_name);
5356 /* Close non-debugging input and output files. Take special care to note
5357 whether fclose returns an error, since the pages might still be on the
5358 buffer chain while the file is open. */
5362 if (ferror (asm_out_file) != 0)
5363 fatal_io_error ("error writing to %s", asm_file_name);
5364 if (fclose (asm_out_file) != 0)
5365 fatal_io_error ("error closing %s", asm_file_name);
5368 /* Do whatever is necessary to finish printing the graphs. */
5369 if (graph_dump_format != no_graph)
5373 for (i = 0; i < (int) DFI_MAX; ++i)
5374 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5379 sprintf (seq, DUMPFILE_FORMAT, i);
5380 suffix = concat (seq, dump_file[i].extension, NULL);
5381 finish_graph_dump_file (dump_base_name, suffix);
5388 ggc_print_statistics ();
5389 stringpool_statistics ();
5390 dump_tree_statistics ();
5393 /* Free up memory for the benefit of leak detectors. */
5396 /* Language-specific end of compilation actions. */
5397 (*lang_hooks.finish) ();
5400 /* Initialize the compiler, and compile the input file. */
5404 /* All command line options have been parsed; allow the front end to
5405 perform consistency checks, etc. */
5406 bool no_backend = (*lang_hooks.post_options) ();
5408 /* The bulk of command line switch processing. */
5411 /* If an error has already occurred, give up. */
5419 char *name = xstrdup (lbasename (filename));
5421 aux_base_name = name;
5422 strip_off_ending (name, strlen (name));
5425 aux_base_name = "gccaux";
5427 /* We cannot start timing until after options are processed since that
5428 says if we run timers or not. */
5430 timevar_start (TV_TOTAL);
5432 /* Set up the back-end if requested. */
5436 /* Language-dependent initialization. Returns true on success. */
5437 if (lang_dependent_init (filename))
5442 /* Stop timing and print the times. */
5443 timevar_stop (TV_TOTAL);
5444 timevar_print (stderr);
5447 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5448 Decode command args, then call compile_file.
5449 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5450 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5452 It is not safe to call this function more than once. */
5455 toplev_main (argc, argv)
5459 /* Initialization of GCC's environment, and diagnostics. */
5460 general_init (argv[0]);
5462 /* Parse the options and do minimal processing; basically just
5463 enough to default flags appropriately. */
5464 parse_options_and_default_flags (argc, argv);
5466 /* Exit early if we can (e.g. -help). */
5467 if (!exit_after_options)
5470 if (errorcount || sorrycount)
5471 return (FATAL_EXIT_CODE);
5473 return (SUCCESS_EXIT_CODE);