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 { "bbro", 'B', 1, 0, 0 },
309 { "sched2", 'R', 1, 0, 0 },
310 { "stack", 'k', 1, 0, 0 },
311 { "mach", 'M', 1, 0, 0 },
312 { "dbr", 'd', 0, 0, 0 },
315 static int open_dump_file PARAMS ((enum dump_file_index, tree));
316 static void close_dump_file PARAMS ((enum dump_file_index,
317 void (*) (FILE *, rtx), rtx));
319 /* Other flags saying which kinds of debugging dump have been requested. */
321 int rtl_dump_and_exit;
322 int flag_print_asm_name;
323 static int version_flag;
324 static 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 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
749 int flag_sched2_use_superblocks = 0;
751 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
753 int flag_sched2_use_traces = 0;
755 /* The following flags have effect only for scheduling before register
758 flag_schedule_interblock means schedule insns across basic blocks.
759 flag_schedule_speculative means allow speculative motion of non-load insns.
760 flag_schedule_speculative_load means allow speculative motion of some
762 flag_schedule_speculative_load_dangerous allows speculative motion of more
765 int flag_schedule_interblock = 1;
766 int flag_schedule_speculative = 1;
767 int flag_schedule_speculative_load = 0;
768 int flag_schedule_speculative_load_dangerous = 0;
770 int flag_single_precision_constant;
772 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
773 by a cheaper branch on a count register. */
774 int flag_branch_on_count_reg = 1;
776 /* -finhibit-size-directive inhibits output of .size for ELF.
777 This is used only for compiling crtstuff.c,
778 and it may be extended to other effects
779 needed for crtstuff.c on other systems. */
780 int flag_inhibit_size_directive = 0;
782 /* -fverbose-asm causes extra commentary information to be produced in
783 the generated assembly code (to make it more readable). This option
784 is generally only of use to those who actually need to read the
785 generated assembly code (perhaps while debugging the compiler itself).
786 -fno-verbose-asm, the default, causes the extra information
787 to be omitted and is useful when comparing two assembler files. */
789 int flag_verbose_asm = 0;
791 /* -dA causes debug commentary information to be produced in
792 the generated assembly code (to make it more readable). This option
793 is generally only of use to those who actually need to read the
794 generated assembly code (perhaps while debugging the compiler itself).
795 Currently, this switch is only used by dwarfout.c; however, it is intended
796 to be a catchall for printing debug information in the assembler file. */
798 int flag_debug_asm = 0;
800 /* -dP causes the rtl to be emitted as a comment in assembly. */
802 int flag_dump_rtl_in_asm = 0;
804 /* -fgnu-linker specifies use of the GNU linker for initializations.
805 (Or, more generally, a linker that handles initializations.)
806 -fno-gnu-linker says that collect2 will be used. */
808 int flag_gnu_linker = 0;
810 int flag_gnu_linker = 1;
813 /* Nonzero means put zero initialized data in the bss section. */
814 int flag_zero_initialized_in_bss = 1;
819 /* Enable ssa conditional constant propagation. */
820 int flag_ssa_ccp = 0;
822 /* Enable ssa aggressive dead code elimination. */
823 int flag_ssa_dce = 0;
825 /* Tag all structures with __attribute__(packed). */
826 int flag_pack_struct = 0;
828 /* Emit code to check for stack overflow; also may cause large objects
829 to be allocated dynamically. */
830 int flag_stack_check;
832 /* When non-NULL, indicates that whenever space is allocated on the
833 stack, the resulting stack pointer must not pass this
834 address---that is, for stacks that grow downward, the stack pointer
835 must always be greater than or equal to this address; for stacks
836 that grow upward, the stack pointer must be less than this address.
837 At present, the rtx may be either a REG or a SYMBOL_REF, although
838 the support provided depends on the backend. */
841 /* 0 if pointer arguments may alias each other. True in C.
842 1 if pointer arguments may not alias each other but may alias
844 2 if pointer arguments may not alias each other and may not
845 alias global variables. True in Fortran.
846 This defaults to 0 for C. */
847 int flag_argument_noalias = 0;
849 /* Nonzero if we should do (language-dependent) alias analysis.
850 Typically, this analysis will assume that expressions of certain
851 types do not alias expressions of certain other types. Only used
852 if alias analysis (in general) is enabled. */
853 int flag_strict_aliasing = 0;
855 /* Instrument functions with calls at entry and exit, for profiling. */
856 int flag_instrument_function_entry_exit = 0;
858 /* Nonzero means ignore `#ident' directives. 0 means handle them.
859 On SVR4 targets, it also controls whether or not to emit a
860 string identifying the compiler. */
862 int flag_no_ident = 0;
864 /* This will perform a peephole pass before sched2. */
865 int flag_peephole2 = 0;
867 /* This will try to guess branch probabilities. */
868 int flag_guess_branch_prob = 0;
870 /* -fcheck-bounds causes gcc to generate array bounds checks.
871 For C, C++, ObjC: defaults to off.
872 For Java: defaults to on.
873 For Fortran: defaults to off. */
874 int flag_bounds_check = 0;
876 /* This will attempt to merge constant section constants, if 1 only
877 string constants and constants from constant pool, if 2 also constant
879 int flag_merge_constants = 1;
881 /* If one, renumber instruction UIDs to reduce the number of
882 unused UIDs if there are a lot of instructions. If greater than
883 one, unconditionally renumber instruction UIDs. */
884 int flag_renumber_insns = 1;
886 /* If nonzero, use the graph coloring register allocator. */
887 int flag_new_regalloc = 0;
889 /* Nonzero if we perform superblock formation. */
893 /* Nonzero if we perform whole unit at a time compilation. */
895 int flag_unit_at_a_time = 0;
897 /* Values of the -falign-* flags: how much to align labels in code.
898 0 means `use default', 1 means `don't align'.
899 For each variable, there is an _log variant which is the power
900 of two not less than the variable, for .align output. */
904 int align_loops_max_skip;
907 int align_jumps_max_skip;
909 int align_labels_log;
910 int align_labels_max_skip;
912 int align_functions_log;
914 /* Like align_functions_log above, but used by front-ends to force the
915 minimum function alignment. Zero means no alignment is forced. */
916 int force_align_functions_log;
918 /* Table of supported debugging formats. */
921 const char *const arg;
922 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
923 constant expression, we use NO_DEBUG in its place. */
924 const enum debug_info_type debug_type;
925 const int use_extensions_p;
926 const char *const description;
930 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
931 N_("Generate debugging info in default format") },
932 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
933 #ifdef DBX_DEBUGGING_INFO
934 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
935 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
937 #ifdef DWARF_DEBUGGING_INFO
938 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
939 { "dwarf+", DWARF_DEBUG, 1,
940 N_("Generate extended DWARF-1 format debug info") },
942 #ifdef DWARF2_DEBUGGING_INFO
943 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
945 #ifdef XCOFF_DEBUGGING_INFO
946 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
947 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
949 #ifdef SDB_DEBUGGING_INFO
950 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
952 #ifdef VMS_DEBUGGING_INFO
953 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
960 const char *const string;
963 const char *const description;
965 lang_independent_options;
969 /* Add or remove a leading underscore from user symbols. */
970 int flag_leading_underscore = -1;
972 /* The user symbol prefix after having resolved same. */
973 const char *user_label_prefix;
975 static const param_info lang_independent_params[] = {
976 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
977 { OPTION, DEFAULT, HELP },
978 #include "params.def"
983 /* Table of language-independent -f options.
984 STRING is the option name. VARIABLE is the address of the variable.
985 ON_VALUE is the value to store in VARIABLE
986 if `-fSTRING' is seen as an option.
987 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
989 static const lang_independent_options f_options[] =
991 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
992 N_("Perform DWARF2 duplicate elimination") },
993 {"float-store", &flag_float_store, 1,
994 N_("Do not store floats in registers") },
995 {"defer-pop", &flag_defer_pop, 1,
996 N_("Defer popping functions args from stack until later") },
997 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
998 N_("When possible do not generate stack frames") },
999 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1000 N_("Optimize sibling and tail recursive calls") },
1001 {"tracer", &flag_tracer, 1,
1002 N_("Perform superblock formation via tail duplication") },
1003 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1004 N_("Compile whole compilation unit at a time") },
1005 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1006 N_("When running CSE, follow jumps to their targets") },
1007 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1008 N_("When running CSE, follow conditional jumps") },
1009 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1010 N_("Perform a number of minor, expensive optimizations") },
1011 {"thread-jumps", &flag_thread_jumps, 1,
1012 N_("Perform jump threading optimizations") },
1013 {"strength-reduce", &flag_strength_reduce, 1,
1014 N_("Perform strength reduction optimizations") },
1015 {"unroll-loops", &flag_unroll_loops, 1,
1016 N_("Perform loop unrolling when iteration count is known") },
1017 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1018 N_("Perform loop unrolling for all loops") },
1019 {"unswitch-loops", &flag_unswitch_loops, 1,
1020 N_("Perform loop unswitching") },
1021 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1022 N_("Generate prefetch instructions, if available, for arrays in loops") },
1023 {"move-all-movables", &flag_move_all_movables, 1,
1024 N_("Force all loop invariant computations out of loops") },
1025 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1026 N_("Strength reduce all loop general induction variables") },
1027 {"writable-strings", &flag_writable_strings, 1,
1028 N_("Store strings in writable data section") },
1029 {"peephole", &flag_no_peephole, 0,
1030 N_("Enable machine specific peephole optimizations") },
1031 {"force-mem", &flag_force_mem, 1,
1032 N_("Copy memory operands into registers before using") },
1033 {"force-addr", &flag_force_addr, 1,
1034 N_("Copy memory address constants into regs before using") },
1035 {"function-cse", &flag_no_function_cse, 0,
1036 N_("Allow function addresses to be held in registers") },
1037 {"inline-functions", &flag_inline_functions, 1,
1038 N_("Integrate simple functions into their callers") },
1039 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1040 N_("Generate code for funcs even if they are fully inlined") },
1041 {"inline", &flag_no_inline, 0,
1042 N_("Pay attention to the 'inline' keyword") },
1043 {"keep-static-consts", &flag_keep_static_consts, 1,
1044 N_("Emit static const variables even if they are not used") },
1045 {"syntax-only", &flag_syntax_only, 1,
1046 N_("Check for syntax errors, then stop") },
1047 {"shared-data", &flag_shared_data, 1,
1048 N_("Mark data as shared rather than private") },
1049 {"caller-saves", &flag_caller_saves, 1,
1050 N_("Enable saving registers around function calls") },
1051 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1052 N_("Return 'short' aggregates in memory, not registers") },
1053 {"reg-struct-return", &flag_pcc_struct_return, 0,
1054 N_("Return 'short' aggregates in registers") },
1055 {"delayed-branch", &flag_delayed_branch, 1,
1056 N_("Attempt to fill delay slots of branch instructions") },
1057 {"gcse", &flag_gcse, 1,
1058 N_("Perform the global common subexpression elimination") },
1059 {"gcse-lm", &flag_gcse_lm, 1,
1060 N_("Perform enhanced load motion during global subexpression elimination") },
1061 {"gcse-sm", &flag_gcse_sm, 1,
1062 N_("Perform store motion after global subexpression elimination") },
1063 {"loop-optimize", &flag_loop_optimize, 1,
1064 N_("Perform the loop optimizations") },
1065 {"crossjumping", &flag_crossjumping, 1,
1066 N_("Perform cross-jumping optimization") },
1067 {"if-conversion", &flag_if_conversion, 1,
1068 N_("Perform conversion of conditional jumps to branchless equivalents") },
1069 {"if-conversion2", &flag_if_conversion2, 1,
1070 N_("Perform conversion of conditional jumps to conditional execution") },
1071 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1072 N_("Run CSE pass after loop optimizations") },
1073 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1074 N_("Run the loop optimizer twice") },
1075 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1076 N_("Delete useless null pointer checks") },
1077 {"schedule-insns", &flag_schedule_insns, 1,
1078 N_("Reschedule instructions before register allocation") },
1079 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1080 N_("Reschedule instructions after register allocation") },
1081 {"sched-interblock",&flag_schedule_interblock, 1,
1082 N_("Enable scheduling across basic blocks") },
1083 {"sched-spec",&flag_schedule_speculative, 1,
1084 N_("Allow speculative motion of non-loads") },
1085 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1086 N_("Allow speculative motion of some loads") },
1087 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1088 N_("Allow speculative motion of more loads") },
1089 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1090 N_("If scheduling post reload, do superblock sheduling") },
1091 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1092 N_("If scheduling post reload, do trace sheduling") },
1093 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1094 N_("Replace add,compare,branch with branch on count reg") },
1095 {"pic", &flag_pic, 1,
1096 N_("Generate position independent code, if possible") },
1097 {"PIC", &flag_pic, 2, ""},
1098 {"exceptions", &flag_exceptions, 1,
1099 N_("Enable exception handling") },
1100 {"unwind-tables", &flag_unwind_tables, 1,
1101 N_("Just generate unwind tables for exception handling") },
1102 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1103 N_("Generate unwind tables exact at each instruction boundary") },
1104 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1105 N_("Support synchronous non-call exceptions") },
1106 {"profile-arcs", &profile_arc_flag, 1,
1107 N_("Insert arc based program profiling code") },
1108 {"test-coverage", &flag_test_coverage, 1,
1109 N_("Create data files needed by gcov") },
1110 {"branch-probabilities", &flag_branch_probabilities, 1,
1111 N_("Use profiling information for branch probabilities") },
1112 {"profile", &profile_flag, 1,
1113 N_("Enable basic program profiling code") },
1114 {"reorder-blocks", &flag_reorder_blocks, 1,
1115 N_("Reorder basic blocks to improve code placement") },
1116 {"reorder-functions", &flag_reorder_functions, 1,
1117 N_("Reorder functions to improve code placement") },
1118 {"rename-registers", &flag_rename_registers, 1,
1119 N_("Do the register renaming optimization pass") },
1120 {"cprop-registers", &flag_cprop_registers, 1,
1121 N_("Do the register copy-propagation optimization pass") },
1122 {"common", &flag_no_common, 0,
1123 N_("Do not put uninitialized globals in the common section") },
1124 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1125 N_("Do not generate .size directives") },
1126 {"function-sections", &flag_function_sections, 1,
1127 N_("place each function into its own section") },
1128 {"data-sections", &flag_data_sections, 1,
1129 N_("place data items into their own section") },
1130 {"verbose-asm", &flag_verbose_asm, 1,
1131 N_("Add extra commentry to assembler output") },
1132 {"gnu-linker", &flag_gnu_linker, 1,
1133 N_("Output GNU ld formatted global initializers") },
1134 {"regmove", &flag_regmove, 1,
1135 N_("Enables a register move optimization") },
1136 {"optimize-register-move", &flag_regmove, 1,
1137 N_("Do the full regmove optimization pass") },
1138 {"pack-struct", &flag_pack_struct, 1,
1139 N_("Pack structure members together without holes") },
1140 {"stack-check", &flag_stack_check, 1,
1141 N_("Insert stack checking code into the program") },
1142 {"argument-alias", &flag_argument_noalias, 0,
1143 N_("Specify that arguments may alias each other & globals") },
1144 {"argument-noalias", &flag_argument_noalias, 1,
1145 N_("Assume arguments may alias globals but not each other") },
1146 {"argument-noalias-global", &flag_argument_noalias, 2,
1147 N_("Assume arguments do not alias each other or globals") },
1148 {"strict-aliasing", &flag_strict_aliasing, 1,
1149 N_("Assume strict aliasing rules apply") },
1150 {"align-loops", &align_loops, 0,
1151 N_("Align the start of loops") },
1152 {"align-jumps", &align_jumps, 0,
1153 N_("Align labels which are only reached by jumping") },
1154 {"align-labels", &align_labels, 0,
1155 N_("Align all labels") },
1156 {"align-functions", &align_functions, 0,
1157 N_("Align the start of functions") },
1158 {"merge-constants", &flag_merge_constants, 1,
1159 N_("Attempt to merge identical constants accross compilation units") },
1160 {"merge-all-constants", &flag_merge_constants, 2,
1161 N_("Attempt to merge identical constants and constant variables") },
1162 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1163 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1164 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1165 N_("Instrument function entry/exit with profiling calls") },
1166 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1167 N_("Put zero initialized data in the bss section") },
1168 {"ssa", &flag_ssa, 1,
1169 N_("Enable SSA optimizations") },
1170 {"ssa-ccp", &flag_ssa_ccp, 1,
1171 N_("Enable SSA conditional constant propagation") },
1172 {"ssa-dce", &flag_ssa_dce, 1,
1173 N_("Enable aggressive SSA dead code elimination") },
1174 {"leading-underscore", &flag_leading_underscore, 1,
1175 N_("External symbols have a leading underscore") },
1176 {"ident", &flag_no_ident, 0,
1177 N_("Process #ident directives") },
1178 { "peephole2", &flag_peephole2, 1,
1179 N_("Enables an rtl peephole pass run before sched2") },
1180 {"finite-math-only", &flag_finite_math_only, 1,
1181 N_("Assume no NaNs or +-Infs are generated") },
1182 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1183 N_("Enables guessing of branch probabilities") },
1184 {"math-errno", &flag_errno_math, 1,
1185 N_("Set errno after built-in math functions") },
1186 {"trapping-math", &flag_trapping_math, 1,
1187 N_("Floating-point operations can trap") },
1188 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1189 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1190 {"signaling-nans", &flag_signaling_nans, 1,
1191 N_("Disable optimizations observable by IEEE signaling NaNs") },
1192 {"bounds-check", &flag_bounds_check, 1,
1193 N_("Generate code to check bounds before indexing arrays") },
1194 {"single-precision-constant", &flag_single_precision_constant, 1,
1195 N_("Convert floating point constant to single precision constant") },
1196 {"time-report", &time_report, 1,
1197 N_("Report time taken by each compiler pass at end of run") },
1198 {"mem-report", &mem_report, 1,
1199 N_("Report on permanent memory allocation at end of run") },
1200 { "trapv", &flag_trapv, 1,
1201 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1202 { "new-ra", &flag_new_regalloc, 1,
1203 N_("Use graph coloring register allocation.") },
1206 /* Table of language-specific options. */
1208 static const struct lang_opt
1210 const char *const option;
1211 const char *const description;
1213 documented_lang_options[] =
1215 /* In order not to overload the --help output, the convention
1216 used here is to only describe those options which are not
1217 enabled by default. */
1220 N_("Compile just for ISO C90") },
1222 N_("Determine language standard") },
1224 { "-fsigned-bitfields", "" },
1225 { "-funsigned-bitfields",
1226 N_("Make bit-fields by unsigned by default") },
1227 { "-fno-signed-bitfields", "" },
1228 { "-fno-unsigned-bitfields","" },
1230 N_("Make 'char' be signed by default") },
1231 { "-funsigned-char",
1232 N_("Make 'char' be unsigned by default") },
1233 { "-fno-signed-char", "" },
1234 { "-fno-unsigned-char", "" },
1238 N_("Do not recognize the 'asm' keyword") },
1239 { "-fbuiltin", "" },
1241 N_("Do not recognize any built in functions") },
1243 N_("Assume normal C execution environment") },
1244 { "-fno-hosted", "" },
1246 N_("Assume that standard libraries & main might not exist") },
1247 { "-fno-freestanding", "" },
1248 { "-fcond-mismatch",
1249 N_("Allow different types as args of ? operator") },
1250 { "-fno-cond-mismatch", "" },
1251 { "-fdollars-in-identifiers",
1252 N_("Allow the use of $ inside identifiers") },
1253 { "-fno-dollars-in-identifiers", "" },
1254 { "-fpreprocessed", "" },
1255 { "-fno-preprocessed", "" },
1257 N_("Use the same size for double as for float") },
1258 { "-fno-short-double", "" },
1260 N_("Use the smallest fitting integer to hold enums") },
1261 { "-fno-short-enums", "" },
1263 N_("Override the underlying type for wchar_t to `unsigned short'") },
1264 { "-fno-short-wchar", "" },
1267 N_("Enable most warning messages") },
1268 { "-Wbad-function-cast",
1269 N_("Warn about casting functions to incompatible types") },
1270 { "-Wno-bad-function-cast", "" },
1271 { "-Wmissing-format-attribute",
1272 N_("Warn about functions which might be candidates for format attributes") },
1273 { "-Wno-missing-format-attribute", "" },
1275 N_("Warn about casts which discard qualifiers") },
1276 { "-Wno-cast-qual", "" },
1277 { "-Wchar-subscripts",
1278 N_("Warn about subscripts whose type is 'char'") },
1279 { "-Wno-char-subscripts", "" },
1281 N_("Warn if nested comments are detected") },
1282 { "-Wno-comment", "" },
1284 N_("Warn if nested comments are detected") },
1285 { "-Wno-comments", "" },
1287 N_("Warn about possibly confusing type conversions") },
1288 { "-Wno-conversion", "" },
1289 { "-Wdiv-by-zero", "" },
1290 { "-Wno-div-by-zero",
1291 N_("Do not warn about compile-time integer division by zero") },
1293 N_("Warn about testing equality of floating point numbers") },
1294 { "-Wno-float-equal", "" },
1296 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1297 { "-Wno-format", "" },
1298 { "-Wformat-extra-args", "" },
1299 { "-Wno-format-extra-args",
1300 N_("Don't warn about too many arguments to format functions") },
1301 { "-Wformat-nonliteral",
1302 N_("Warn about non-string-literal format strings") },
1303 { "-Wno-format-nonliteral", "" },
1304 { "-Wformat-security",
1305 N_("Warn about possible security problems with format functions") },
1306 { "-Wno-format-security", "" },
1307 { "-Wformat-y2k", "" },
1308 { "-Wno-format-y2k",
1309 N_("Don't warn about strftime formats yielding 2 digit years") },
1310 { "-Wimplicit-function-declaration",
1311 N_("Warn about implicit function declarations") },
1312 { "-Wno-implicit-function-declaration", "" },
1313 { "-Werror-implicit-function-declaration", "" },
1315 N_("Warn when a declaration does not specify a type") },
1316 { "-Wno-implicit-int", "" },
1317 { "-Wimplicit", "" },
1318 { "-Wno-implicit", "" },
1320 N_("Warn about the use of the #import directive") },
1321 { "-Wno-import", "" },
1323 N_("Warn about PCH files that are found but not used") },
1324 { "-Wlong-long","" },
1326 N_("Do not warn about using 'long long' when -pedantic") },
1328 N_("Warn about suspicious declarations of main") },
1329 { "-Wno-main", "" },
1330 { "-Wmissing-braces",
1331 N_("Warn about possibly missing braces around initializers") },
1332 { "-Wno-missing-braces", "" },
1333 { "-Wmissing-declarations",
1334 N_("Warn about global funcs without previous declarations") },
1335 { "-Wno-missing-declarations", "" },
1336 { "-Wmissing-prototypes",
1337 N_("Warn about global funcs without prototypes") },
1338 { "-Wno-missing-prototypes", "" },
1340 N_("Warn about use of multicharacter literals") },
1341 { "-Wno-multichar", "" },
1342 { "-Wnested-externs",
1343 N_("Warn about externs not at file scope level") },
1344 { "-Wno-nested-externs", "" },
1346 N_("Warn about possible missing parentheses") },
1347 { "-Wno-parentheses", "" },
1348 { "-Wpointer-arith",
1349 N_("Warn about function pointer arithmetic") },
1350 { "-Wno-pointer-arith", "" },
1351 { "-Wredundant-decls",
1352 N_("Warn about multiple declarations of the same object") },
1353 { "-Wno-redundant-decls", "" },
1355 N_("Warn whenever a function's return-type defaults to int") },
1356 { "-Wno-return-type", "" },
1357 { "-Wsequence-point",
1358 N_("Warn about possible violations of sequence point rules") },
1359 { "-Wno-sequence-point", "" },
1361 N_("Warn about signed/unsigned comparisons") },
1362 { "-Wno-sign-compare", "" },
1363 { "-Wstrict-prototypes",
1364 N_("Warn about non-prototyped function decls") },
1365 { "-Wno-strict-prototypes", "" },
1367 N_("Warn about constructs whose meanings change in ISO C") },
1368 { "-Wno-traditional", "" },
1370 N_("Warn when trigraphs are encountered") },
1371 { "-Wno-trigraphs", "" },
1373 { "-Wno-undef", "" },
1374 { "-Wunknown-pragmas",
1375 N_("Warn about unrecognized pragmas") },
1376 { "-Wno-unknown-pragmas", "" },
1377 { "-Wwrite-strings",
1378 N_("Mark strings as 'const char *'") },
1379 { "-Wno-write-strings", "" },
1381 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1383 #include "options.h"
1387 /* Here is a table, controlled by the tm.h file, listing each -m switch
1388 and which bits in `target_switches' it should set or clear.
1389 If VALUE is positive, it is bits to set.
1390 If VALUE is negative, -VALUE is bits to clear.
1391 (The sign bit is not used so there is no confusion.) */
1395 const char *const name;
1397 const char *const description;
1399 target_switches[] = TARGET_SWITCHES;
1401 /* This table is similar, but allows the switch to have a value. */
1403 #ifdef TARGET_OPTIONS
1406 const char *const prefix;
1407 const char **const variable;
1408 const char *const description;
1410 target_options[] = TARGET_OPTIONS;
1413 /* Options controlling warnings. */
1415 /* Don't print warning messages. -w. */
1417 int inhibit_warnings = 0;
1419 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1421 int warn_system_headers = 0;
1423 /* Print various extra warnings. -W/-Wextra. */
1425 int extra_warnings = 0;
1427 /* Treat warnings as errors. -Werror. */
1429 int warnings_are_errors = 0;
1431 /* Nonzero to warn about unused variables, functions et.al. */
1433 int warn_unused_function;
1434 int warn_unused_label;
1435 int warn_unused_parameter;
1436 int warn_unused_variable;
1437 int warn_unused_value;
1439 /* Nonzero to warn about code which is never reached. */
1441 int warn_notreached;
1443 /* Nonzero to warn about variables used before they are initialized. */
1445 int warn_uninitialized;
1447 /* Nonzero means warn about all declarations which shadow others. */
1451 /* Warn if a switch on an enum, that does not have a default case,
1452 fails to have a case for every enum value. */
1456 /* Warn if a switch does not have a default case. */
1458 int warn_switch_default;
1460 /* Warn if a switch on an enum fails to have a case for every enum
1461 value (regardless of the presence or otherwise of a default case). */
1463 int warn_switch_enum;
1465 /* Nonzero means warn about function definitions that default the return type
1466 or that use a null return and have a return-type other than void. */
1468 int warn_return_type;
1470 /* Nonzero means warn about pointer casts that increase the required
1471 alignment of the target type (and might therefore lead to a crash
1472 due to a misaligned access). */
1474 int warn_cast_align;
1476 /* Nonzero means warn about any objects definitions whose size is larger
1477 than N bytes. Also want about function definitions whose returned
1478 values are larger than N bytes. The value N is in `larger_than_size'. */
1480 int warn_larger_than;
1481 HOST_WIDE_INT larger_than_size;
1483 /* Nonzero means warn if inline function is too large. */
1487 /* Warn if a function returns an aggregate,
1488 since there are often incompatible calling conventions for doing this. */
1490 int warn_aggregate_return;
1492 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1496 /* Warn when gcc pads a structure to an alignment boundary. */
1500 /* Warn when an optimization pass is disabled. */
1502 int warn_disabled_optimization;
1504 /* Warn about functions which might be candidates for attribute noreturn. */
1506 int warn_missing_noreturn;
1508 /* Nonzero means warn about uses of __attribute__((deprecated))
1511 int warn_deprecated_decl = 1;
1513 /* Nonzero means warn about constructs which might not be
1514 strict-aliasing safe. */
1516 int warn_strict_aliasing;
1518 /* Like f_options, but for -W. */
1520 static const lang_independent_options W_options[] =
1522 {"unused-function", &warn_unused_function, 1,
1523 N_("Warn when a function is unused") },
1524 {"unused-label", &warn_unused_label, 1,
1525 N_("Warn when a label is unused") },
1526 {"unused-parameter", &warn_unused_parameter, 1,
1527 N_("Warn when a function parameter is unused") },
1528 {"unused-variable", &warn_unused_variable, 1,
1529 N_("Warn when a variable is unused") },
1530 {"unused-value", &warn_unused_value, 1,
1531 N_("Warn when an expression value is unused") },
1532 {"system-headers", &warn_system_headers, 1,
1533 N_("Do not suppress warnings from system headers") },
1534 {"error", &warnings_are_errors, 1,
1535 N_("Treat all warnings as errors") },
1536 {"shadow", &warn_shadow, 1,
1537 N_("Warn when one local variable shadows another") },
1538 {"switch", &warn_switch, 1,
1539 N_("Warn about enumerated switches, with no default, missing a case") },
1540 {"switch-default", &warn_switch_default, 1,
1541 N_("Warn about enumerated switches missing a default case") },
1542 {"switch-enum", &warn_switch_enum, 1,
1543 N_("Warn about all enumerated switches missing a specific case") },
1544 {"aggregate-return", &warn_aggregate_return, 1,
1545 N_("Warn about returning structures, unions or arrays") },
1546 {"cast-align", &warn_cast_align, 1,
1547 N_("Warn about pointer casts which increase alignment") },
1548 {"unreachable-code", &warn_notreached, 1,
1549 N_("Warn about code that will never be executed") },
1550 {"uninitialized", &warn_uninitialized, 1,
1551 N_("Warn about uninitialized automatic variables") },
1552 {"inline", &warn_inline, 1,
1553 N_("Warn when an inlined function cannot be inlined") },
1554 {"packed", &warn_packed, 1,
1555 N_("Warn when the packed attribute has no effect on struct layout") },
1556 {"padded", &warn_padded, 1,
1557 N_("Warn when padding is required to align struct members") },
1558 {"disabled-optimization", &warn_disabled_optimization, 1,
1559 N_("Warn when an optimization pass is disabled") },
1560 {"deprecated-declarations", &warn_deprecated_decl, 1,
1561 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1562 {"extra", &extra_warnings, 1,
1563 N_("Print extra (possibly unwanted) warnings") },
1564 {"missing-noreturn", &warn_missing_noreturn, 1,
1565 N_("Warn about functions which might be candidates for attribute noreturn") },
1566 {"strict-aliasing", &warn_strict_aliasing, 1,
1567 N_ ("Warn about code which might break the strict aliasing rules") }
1571 set_Wunused (setting)
1574 warn_unused_function = setting;
1575 warn_unused_label = setting;
1576 /* Unused function parameter warnings are reported when either ``-W
1577 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1578 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1580 warn_unused_parameter = 0;
1581 else if (!warn_unused_parameter)
1582 warn_unused_parameter = -1;
1583 warn_unused_variable = setting;
1584 warn_unused_value = setting;
1587 /* The following routines are useful in setting all the flags that
1588 -ffast-math and -fno-fast-math imply. */
1591 set_fast_math_flags (set)
1594 flag_trapping_math = !set;
1595 flag_unsafe_math_optimizations = set;
1596 flag_finite_math_only = set;
1597 flag_errno_math = !set;
1599 flag_signaling_nans = 0;
1602 /* Return true iff flags are set as if -ffast-math. */
1604 fast_math_flags_set_p ()
1606 return (!flag_trapping_math
1607 && flag_unsafe_math_optimizations
1608 && flag_finite_math_only
1609 && !flag_errno_math);
1613 /* Output files for assembler code (real compiler output)
1614 and debugging dumps. */
1617 FILE *aux_info_file;
1618 FILE *rtl_dump_file = NULL;
1620 /* Decode the string P as an integral parameter.
1621 If the string is indeed an integer return its numeric value else
1622 issue an Invalid Option error for the option PNAME and return DEFVAL.
1623 If PNAME is zero just return DEFVAL, do not call error. */
1626 read_integral_parameter (p, pname, defval)
1631 const char *endp = p;
1635 if (ISDIGIT (*endp))
1644 error ("invalid option `%s'", pname);
1651 /* This calls abort and is used to avoid problems when abort is a macro.
1652 It is used when we need to pass the address of abort. */
1660 /* When `malloc.c' is compiled with `rcheck' defined,
1661 it calls this function to report clobberage. */
1665 const char *s ATTRIBUTE_UNUSED;
1670 /* Return the logarithm of X, base 2, considering X unsigned,
1671 if X is a power of 2. Otherwise, returns -1.
1673 This should be used via the `exact_log2' macro. */
1677 unsigned HOST_WIDE_INT x;
1680 /* Test for 0 or a power of 2. */
1681 if (x == 0 || x != (x & -x))
1683 while ((x >>= 1) != 0)
1688 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1689 If X is 0, return -1.
1691 This should be used via the floor_log2 macro. */
1695 unsigned HOST_WIDE_INT x;
1704 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1705 into ICE messages, which is much more user friendly. */
1708 crash_signal (signo)
1711 internal_error ("%s", strsignal (signo));
1714 /* Arrange to dump core on error. (The regular error message is still
1715 printed first, except in the case of abort().) */
1718 setup_core_dumping ()
1721 signal (SIGABRT, SIG_DFL);
1723 #if defined(HAVE_SETRLIMIT)
1726 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1727 fatal_io_error ("getting core file size maximum limit");
1728 rlim.rlim_cur = rlim.rlim_max;
1729 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1730 fatal_io_error ("setting core file size limit to maximum");
1733 diagnostic_abort_on_error (global_dc);
1737 /* Strip off a legitimate source ending from the input string NAME of
1738 length LEN. Rather than having to know the names used by all of
1739 our front ends, we strip off an ending of a period followed by
1740 up to five characters. (Java uses ".class".) */
1743 strip_off_ending (name, len)
1748 for (i = 2; i < 6 && len > i; i++)
1750 if (name[len - i] == '.')
1752 name[len - i] = '\0';
1758 /* Output a quoted string. */
1761 output_quoted_string (asm_file, string)
1765 #ifdef OUTPUT_QUOTED_STRING
1766 OUTPUT_QUOTED_STRING (asm_file, string);
1770 putc ('\"', asm_file);
1771 while ((c = *string++) != 0)
1775 if (c == '\"' || c == '\\')
1776 putc ('\\', asm_file);
1780 fprintf (asm_file, "\\%03o", (unsigned char) c);
1782 putc ('\"', asm_file);
1786 /* Output NAME into FILE after having turned it into something
1787 usable as an identifier in a target's assembly file. */
1789 output_clean_symbol_name (file, name)
1793 /* Make a copy of NAME. */
1794 char *id = xstrdup (name);
1796 /* Make it look like a valid identifier for an assembler. */
1797 clean_symbol_name (id);
1804 /* Output a file name in the form wanted by System V. */
1807 output_file_directive (asm_file, input_name)
1809 const char *input_name;
1811 int len = strlen (input_name);
1812 const char *na = input_name + len;
1814 /* NA gets INPUT_NAME sans directory names. */
1815 while (na > input_name)
1817 if (IS_DIR_SEPARATOR (na[-1]))
1822 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1823 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1825 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1826 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1828 fprintf (asm_file, "\t.file\t");
1829 output_quoted_string (asm_file, na);
1830 fputc ('\n', asm_file);
1835 /* Routine to open a dump file. Return true if the dump file is enabled. */
1838 open_dump_file (index, decl)
1839 enum dump_file_index index;
1843 const char *open_arg;
1846 if (! dump_file[index].enabled)
1849 timevar_push (TV_DUMP);
1850 if (rtl_dump_file != NULL)
1851 fclose (rtl_dump_file);
1853 sprintf (seq, DUMPFILE_FORMAT, index);
1855 if (! dump_file[index].initialized)
1857 /* If we've not initialized the files, do so now. */
1858 if (graph_dump_format != no_graph
1859 && dump_file[index].graph_dump_p)
1861 dump_name = concat (seq, dump_file[index].extension, NULL);
1862 clean_graph_dump_file (dump_base_name, dump_name);
1865 dump_file[index].initialized = 1;
1871 dump_name = concat (dump_base_name, seq,
1872 dump_file[index].extension, NULL);
1874 rtl_dump_file = fopen (dump_name, open_arg);
1875 if (rtl_dump_file == NULL)
1876 fatal_io_error ("can't open %s", dump_name);
1881 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1882 (*lang_hooks.decl_printable_name) (decl, 2),
1883 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1885 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1886 ? " (unlikely executed)"
1889 timevar_pop (TV_DUMP);
1893 /* Routine to close a dump file. */
1896 close_dump_file (index, func, insns)
1897 enum dump_file_index index;
1898 void (*func) PARAMS ((FILE *, rtx));
1901 if (! rtl_dump_file)
1904 timevar_push (TV_DUMP);
1906 && graph_dump_format != no_graph
1907 && dump_file[index].graph_dump_p)
1912 sprintf (seq, DUMPFILE_FORMAT, index);
1913 suffix = concat (seq, dump_file[index].extension, NULL);
1914 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1919 func (rtl_dump_file, insns);
1921 fflush (rtl_dump_file);
1922 fclose (rtl_dump_file);
1924 rtl_dump_file = NULL;
1925 timevar_pop (TV_DUMP);
1928 /* Do any final processing required for the declarations in VEC, of
1929 which there are LEN. We write out inline functions and variables
1930 that have been deferred until this point, but which are required.
1931 Returns nonzero if anything was put out. */
1934 wrapup_global_declarations (vec, len)
1941 int output_something = 0;
1943 for (i = 0; i < len; i++)
1947 /* We're not deferring this any longer. Assignment is
1948 conditional to avoid needlessly dirtying PCH pages. */
1949 if (DECL_DEFER_OUTPUT (decl) != 0)
1950 DECL_DEFER_OUTPUT (decl) = 0;
1952 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1953 (*lang_hooks.finish_incomplete_decl) (decl);
1956 /* Now emit any global variables or functions that we have been
1957 putting off. We need to loop in case one of the things emitted
1958 here references another one which comes earlier in the list. */
1962 for (i = 0; i < len; i++)
1966 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1969 /* Don't write out static consts, unless we still need them.
1971 We also keep static consts if not optimizing (for debugging),
1972 unless the user specified -fno-keep-static-consts.
1973 ??? They might be better written into the debug information.
1974 This is possible when using DWARF.
1976 A language processor that wants static constants to be always
1977 written out (even if it is not used) is responsible for
1978 calling rest_of_decl_compilation itself. E.g. the C front-end
1979 calls rest_of_decl_compilation from finish_decl.
1980 One motivation for this is that is conventional in some
1981 environments to write things like:
1982 static const char rcsid[] = "... version string ...";
1983 intending to force the string to be in the executable.
1985 A language processor that would prefer to have unneeded
1986 static constants "optimized away" would just defer writing
1987 them out until here. E.g. C++ does this, because static
1988 constants are often defined in header files.
1990 ??? A tempting alternative (for both C and C++) would be
1991 to force a constant to be written if and only if it is
1992 defined in a main file, as opposed to an include file. */
1994 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1998 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2000 else if (DECL_COMDAT (decl))
2002 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
2003 && (optimize || !flag_keep_static_consts
2004 || DECL_ARTIFICIAL (decl)))
2010 rest_of_decl_compilation (decl, NULL, 1, 1);
2014 if (TREE_CODE (decl) == FUNCTION_DECL
2015 && DECL_INITIAL (decl) != 0
2016 && DECL_SAVED_INSNS (decl) != 0
2017 && (flag_keep_inline_functions
2018 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2019 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2022 output_inline_function (decl);
2027 output_something = 1;
2031 return output_something;
2034 /* Issue appropriate warnings for the global declarations in VEC (of
2035 which there are LEN). Output debugging information for them. */
2038 check_global_declarations (vec, len)
2045 for (i = 0; i < len; i++)
2049 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2050 && ! TREE_ASM_WRITTEN (decl))
2051 /* Cancel the RTL for this decl so that, if debugging info
2052 output for global variables is still to come,
2053 this one will be omitted. */
2054 SET_DECL_RTL (decl, NULL_RTX);
2056 /* Warn about any function
2057 declared static but not defined.
2058 We don't warn about variables,
2059 because many programs have static variables
2060 that exist only to get some text into the object file. */
2061 if (TREE_CODE (decl) == FUNCTION_DECL
2062 && (warn_unused_function
2063 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2064 && DECL_INITIAL (decl) == 0
2065 && DECL_EXTERNAL (decl)
2066 && ! DECL_ARTIFICIAL (decl)
2067 && ! TREE_PUBLIC (decl))
2069 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2070 pedwarn_with_decl (decl,
2071 "`%s' used but never defined");
2073 warning_with_decl (decl,
2074 "`%s' declared `static' but never defined");
2075 /* This symbol is effectively an "extern" declaration now. */
2076 TREE_PUBLIC (decl) = 1;
2077 assemble_external (decl);
2080 /* Warn about static fns or vars defined but not used. */
2081 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2082 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2083 && ! TREE_USED (decl)
2084 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2085 to handle multiple external decls in different scopes. */
2086 && ! TREE_USED (DECL_NAME (decl))
2087 && ! DECL_EXTERNAL (decl)
2088 && ! TREE_PUBLIC (decl)
2089 /* Global register variables must be declared to reserve them. */
2090 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2091 /* Otherwise, ask the language. */
2092 && (*lang_hooks.decls.warn_unused_global) (decl))
2093 warning_with_decl (decl, "`%s' defined but not used");
2095 /* Avoid confusing the debug information machinery when there are
2097 if (errorcount == 0 && sorrycount == 0)
2099 timevar_push (TV_SYMOUT);
2100 (*debug_hooks->global_decl) (decl);
2101 timevar_pop (TV_SYMOUT);
2106 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2107 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2108 INPUT_FILENAME and LINENO accordingly. */
2111 push_srcloc (file, line)
2115 struct file_stack *fs;
2117 if (input_file_stack)
2119 input_file_stack->name = input_filename;
2120 input_file_stack->line = lineno;
2123 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2124 fs->name = input_filename = file;
2125 fs->line = lineno = line;
2126 fs->next = input_file_stack;
2127 input_file_stack = fs;
2128 input_file_stack_tick++;
2131 /* Pop the top entry off the stack of presently open source files.
2132 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2138 struct file_stack *fs;
2140 fs = input_file_stack;
2141 input_file_stack = fs->next;
2143 input_file_stack_tick++;
2144 /* The initial source file is never popped. */
2145 if (!input_file_stack)
2147 input_filename = input_file_stack->name;
2148 lineno = input_file_stack->line;
2151 /* Compile an entire translation unit. Write a file of assembly
2152 output and various debugging dumps. */
2157 /* Initialize yet another pass. */
2159 init_final (main_input_filename);
2160 init_branch_prob (aux_base_name);
2162 timevar_push (TV_PARSE);
2164 /* Call the parser, which parses the entire file (calling
2165 rest_of_compilation for each function). */
2166 (*lang_hooks.parse_file) (set_yydebug);
2168 /* In case there were missing block closers,
2169 get us back to the global binding level. */
2170 (*lang_hooks.clear_binding_stack) ();
2172 /* Compilation is now finished except for writing
2173 what's left of the symbol table output. */
2174 timevar_pop (TV_PARSE);
2176 if (flag_syntax_only)
2179 (*lang_hooks.decls.final_write_globals)();
2181 if (profile_arc_flag)
2182 /* This must occur after the loop to output deferred functions.
2183 Else the profiler initializer would not be emitted if all the
2184 functions in this compilation unit were deferred. */
2187 /* Write out any pending weak symbol declarations. */
2191 /* Do dbx symbols. */
2192 timevar_push (TV_SYMOUT);
2194 #ifdef DWARF2_UNWIND_INFO
2195 if (dwarf2out_do_frame ())
2196 dwarf2out_frame_finish ();
2199 (*debug_hooks->finish) (main_input_filename);
2200 timevar_pop (TV_SYMOUT);
2202 /* Output some stuff at end of file if nec. */
2204 dw2_output_indirect_constants ();
2206 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2208 timevar_push (TV_DUMP);
2209 open_dump_file (DFI_bp, NULL);
2213 close_dump_file (DFI_bp, NULL, NULL_RTX);
2214 timevar_pop (TV_DUMP);
2218 ASM_FILE_END (asm_out_file);
2221 /* Attach a special .ident directive to the end of the file to identify
2222 the version of GCC which compiled this code. The format of the .ident
2223 string is patterned after the ones produced by native SVR4 compilers. */
2226 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2227 IDENT_ASM_OP, version_string);
2230 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2232 timevar_push (TV_DUMP);
2233 dump_combine_total_stats (rtl_dump_file);
2234 close_dump_file (DFI_combine, NULL, NULL_RTX);
2235 timevar_pop (TV_DUMP);
2239 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2240 and TYPE_DECL nodes.
2242 This does nothing for local (non-static) variables, unless the
2243 variable is a register variable with an ASMSPEC. In that case, or
2244 if the variable is not an automatic, it sets up the RTL and
2245 outputs any assembler code (label definition, storage allocation
2246 and initialization).
2248 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2249 the assembler symbol name to be used. TOP_LEVEL is nonzero
2250 if this declaration is not within a function. */
2253 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2255 const char *asmspec;
2259 /* We deferred calling assemble_alias so that we could collect
2260 other attributes such as visibility. Emit the alias now. */
2263 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2266 alias = TREE_VALUE (TREE_VALUE (alias));
2267 alias = get_identifier (TREE_STRING_POINTER (alias));
2268 assemble_alias (decl, alias);
2272 /* Forward declarations for nested functions are not "external",
2273 but we need to treat them as if they were. */
2274 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2275 || TREE_CODE (decl) == FUNCTION_DECL)
2277 timevar_push (TV_VARCONST);
2280 make_decl_rtl (decl, asmspec);
2282 /* Don't output anything when a tentative file-scope definition
2283 is seen. But at end of compilation, do output code for them. */
2284 if (at_end || !DECL_DEFER_OUTPUT (decl))
2285 assemble_variable (decl, top_level, at_end, 0);
2287 #ifdef ASM_FINISH_DECLARE_OBJECT
2288 if (decl == last_assemble_variable_decl)
2290 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2295 timevar_pop (TV_VARCONST);
2297 else if (DECL_REGISTER (decl) && asmspec != 0)
2299 if (decode_reg_name (asmspec) >= 0)
2301 SET_DECL_RTL (decl, NULL_RTX);
2302 make_decl_rtl (decl, asmspec);
2306 error ("invalid register name `%s' for register variable", asmspec);
2307 DECL_REGISTER (decl) = 0;
2312 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2313 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2314 && TREE_CODE (decl) == TYPE_DECL)
2316 timevar_push (TV_SYMOUT);
2317 dbxout_symbol (decl, 0);
2318 timevar_pop (TV_SYMOUT);
2321 #ifdef SDB_DEBUGGING_INFO
2322 else if (write_symbols == SDB_DEBUG && top_level
2323 && TREE_CODE (decl) == TYPE_DECL)
2325 timevar_push (TV_SYMOUT);
2326 sdbout_symbol (decl, 0);
2327 timevar_pop (TV_SYMOUT);
2330 #ifdef DWARF2_DEBUGGING_INFO
2331 else if ((write_symbols == DWARF2_DEBUG
2332 || write_symbols == VMS_AND_DWARF2_DEBUG)
2334 && TREE_CODE (decl) == TYPE_DECL)
2336 timevar_push (TV_SYMOUT);
2337 dwarf2out_decl (decl);
2338 timevar_pop (TV_SYMOUT);
2343 /* Called after finishing a record, union or enumeral type. */
2346 rest_of_type_compilation (type, toplev)
2347 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2348 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2352 tree type ATTRIBUTE_UNUSED;
2353 int toplev ATTRIBUTE_UNUSED;
2356 /* Avoid confusing the debug information machinery when there are
2358 if (errorcount != 0 || sorrycount != 0)
2361 timevar_push (TV_SYMOUT);
2362 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2363 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2364 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2366 #ifdef SDB_DEBUGGING_INFO
2367 if (write_symbols == SDB_DEBUG)
2368 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2370 #ifdef DWARF2_DEBUGGING_INFO
2371 if ((write_symbols == DWARF2_DEBUG
2372 || write_symbols == VMS_AND_DWARF2_DEBUG)
2374 dwarf2out_decl (TYPE_STUB_DECL (type));
2376 timevar_pop (TV_SYMOUT);
2379 /* This is called from finish_function (within langhooks.parse_file)
2380 after each top-level definition is parsed.
2381 It is supposed to compile that function or variable
2382 and output the assembler code for it.
2383 After we return, the tree storage is freed. */
2386 rest_of_compilation (decl)
2392 int rebuild_label_notes_after_reload;
2394 timevar_push (TV_REST_OF_COMPILATION);
2396 /* Now that we're out of the frontend, we shouldn't have any more
2397 CONCATs anywhere. */
2398 generating_concat_p = 0;
2400 /* When processing delayed functions, prepare_function_start() won't
2401 have been run to re-initialize it. */
2402 cse_not_expected = ! optimize;
2404 /* First, make sure that NOTE_BLOCK is set correctly for each
2405 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2406 if (!cfun->x_whole_function_mode_p)
2409 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2410 tree in sensible shape. So, we just recalculate it here. */
2411 if (cfun->x_whole_function_mode_p)
2416 /* If we are reconsidering an inline function
2417 at the end of compilation, skip the stuff for making it inline. */
2419 if (DECL_SAVED_INSNS (decl) == 0)
2425 /* If this is nested inside an inlined external function, pretend
2426 it was only declared. Since we cannot inline such functions,
2427 generating code for this one is not only not necessary but will
2428 confuse some debugging output writers. */
2429 for (parent = DECL_CONTEXT (current_function_decl);
2430 parent != NULL_TREE;
2431 parent = get_containing_scope (parent))
2432 if (TREE_CODE (parent) == FUNCTION_DECL
2433 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2435 DECL_INITIAL (decl) = 0;
2436 goto exit_rest_of_compilation;
2438 else if (TYPE_P (parent))
2439 /* A function in a local class should be treated normally. */
2442 /* If requested, consider whether to make this function inline. */
2443 if ((DECL_INLINE (decl) && !flag_no_inline)
2444 || flag_inline_functions)
2446 timevar_push (TV_INTEGRATION);
2447 lose = function_cannot_inline_p (decl);
2448 timevar_pop (TV_INTEGRATION);
2449 if (lose || ! optimize)
2451 if (warn_inline && DECL_INLINE (decl))
2452 warning_with_decl (decl, lose);
2453 DECL_ABSTRACT_ORIGIN (decl) = 0;
2454 /* Don't really compile an extern inline function.
2455 If we can't make it inline, pretend
2456 it was only declared. */
2457 if (DECL_EXTERNAL (decl))
2459 DECL_INITIAL (decl) = 0;
2460 goto exit_rest_of_compilation;
2464 /* ??? Note that this has the effect of making it look
2465 like "inline" was specified for a function if we choose
2466 to inline it. This isn't quite right, but it's
2467 probably not worth the trouble to fix. */
2468 inlinable = DECL_INLINE (decl) = 1;
2471 insns = get_insns ();
2473 /* Dump the rtl code if we are dumping rtl. */
2475 if (open_dump_file (DFI_rtl, decl))
2477 if (DECL_SAVED_INSNS (decl))
2478 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2479 close_dump_file (DFI_rtl, print_rtl, insns);
2482 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2483 sorts of eh initialization. Delay this until after the
2484 initial rtl dump so that we can see the original nesting. */
2485 convert_from_eh_region_ranges ();
2487 /* If function is inline, and we don't yet know whether to
2488 compile it by itself, defer decision till end of compilation.
2489 wrapup_global_declarations will (indirectly) call
2490 rest_of_compilation again for those functions that need to
2491 be output. Also defer those functions that we are supposed
2495 || (DECL_INLINE (decl)
2496 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2497 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2498 && ! flag_keep_inline_functions)
2499 || DECL_EXTERNAL (decl))))
2500 DECL_DEFER_OUTPUT (decl) = 1;
2502 if (DECL_INLINE (decl))
2503 /* DWARF wants separate debugging info for abstract and
2504 concrete instances of all inline functions, including those
2505 declared inline but not inlined, and those inlined even
2506 though they weren't declared inline. Conveniently, that's
2507 what DECL_INLINE means at this point. */
2508 (*debug_hooks->deferred_inline_function) (decl);
2510 if (DECL_DEFER_OUTPUT (decl))
2512 /* If -Wreturn-type, we have to do a bit of compilation. We just
2513 want to call cleanup the cfg to figure out whether or not we can
2514 fall off the end of the function; we do the minimum amount of
2515 work necessary to make that safe. */
2516 if (warn_return_type)
2518 int saved_optimize = optimize;
2521 rebuild_jump_labels (insns);
2522 find_exception_handler_labels ();
2523 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2524 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2525 optimize = saved_optimize;
2527 /* CFG is no longer maintained up-to-date. */
2528 free_bb_for_insn ();
2531 set_nothrow_function_flags ();
2532 if (current_function_nothrow)
2533 /* Now we know that this can't throw; set the flag for the benefit
2534 of other functions later in this translation unit. */
2535 TREE_NOTHROW (current_function_decl) = 1;
2537 timevar_push (TV_INTEGRATION);
2538 save_for_inline (decl);
2539 timevar_pop (TV_INTEGRATION);
2540 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2541 goto exit_rest_of_compilation;
2544 /* If specified extern inline but we aren't inlining it, we are
2545 done. This goes for anything that gets here with DECL_EXTERNAL
2546 set, not just things with DECL_INLINE. */
2547 if (DECL_EXTERNAL (decl))
2548 goto exit_rest_of_compilation;
2551 /* If we're emitting a nested function, make sure its parent gets
2552 emitted as well. Doing otherwise confuses debug info. */
2555 for (parent = DECL_CONTEXT (current_function_decl);
2556 parent != NULL_TREE;
2557 parent = get_containing_scope (parent))
2558 if (TREE_CODE (parent) == FUNCTION_DECL)
2559 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2562 /* We are now committed to emitting code for this function. Do any
2563 preparation, such as emitting abstract debug info for the inline
2564 before it gets mangled by optimization. */
2565 if (DECL_INLINE (decl))
2566 (*debug_hooks->outlining_inline_function) (decl);
2568 /* Remove any notes we don't need. That will make iterating
2569 over the instruction sequence faster, and allow the garbage
2570 collector to reclaim the memory used by the notes. */
2571 remove_unnecessary_notes ();
2576 /* Initialize some variables used by the optimizers. */
2577 init_function_for_compilation ();
2579 if (! DECL_DEFER_OUTPUT (decl))
2580 TREE_ASM_WRITTEN (decl) = 1;
2582 /* Now that integrate will no longer see our rtl, we need not
2583 distinguish between the return value of this function and the
2584 return value of called functions. Also, we can remove all SETs
2585 of subregs of hard registers; they are only here because of
2586 integrate. Also, we can now initialize pseudos intended to
2587 carry magic hard reg data throughout the function. */
2588 rtx_equal_function_value_matters = 0;
2589 purge_hard_subreg_sets (get_insns ());
2591 /* Early return if there were errors. We can run afoul of our
2592 consistency checks, and there's not really much point in fixing them.
2593 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2594 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2595 || errorcount || sorrycount)
2596 goto exit_rest_of_compilation;
2598 timevar_push (TV_JUMP);
2599 open_dump_file (DFI_sibling, decl);
2600 insns = get_insns ();
2601 rebuild_jump_labels (insns);
2602 find_exception_handler_labels ();
2603 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2605 delete_unreachable_blocks ();
2607 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2608 if (flag_guess_branch_prob)
2610 timevar_push (TV_BRANCH_PROB);
2611 note_prediction_to_br_prob ();
2612 timevar_pop (TV_BRANCH_PROB);
2615 /* We may have potential sibling or tail recursion sites. Select one
2616 (of possibly multiple) methods of performing the call. */
2617 if (flag_optimize_sibling_calls)
2620 optimize_sibling_and_tail_recursive_calls ();
2622 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2623 free_bb_for_insn ();
2624 find_exception_handler_labels ();
2625 rebuild_jump_labels (insns);
2626 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2628 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2629 notes before simplifying cfg and we must do lowering after sibcall
2630 that unhides parts of RTL chain and cleans up the CFG.
2632 Until sibcall is replaced by tree-level optimizer, lets just
2633 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2634 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2635 if (GET_CODE (insn) == NOTE
2636 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2639 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2640 timevar_pop (TV_JUMP);
2642 scope_to_insns_initialize ();
2643 /* Complete generation of exception handling code. */
2646 timevar_push (TV_JUMP);
2647 open_dump_file (DFI_eh, decl);
2649 finish_eh_generation ();
2651 close_dump_file (DFI_eh, print_rtl, get_insns ());
2652 timevar_pop (TV_JUMP);
2655 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2656 generation, which might create new sets. */
2657 emit_initial_value_sets ();
2660 /* If we are doing position-independent code generation, now
2661 is the time to output special prologues and epilogues.
2662 We do not want to do this earlier, because it just clutters
2663 up inline functions with meaningless insns. */
2668 insns = get_insns ();
2670 /* Copy any shared structure that should not be shared. */
2671 unshare_all_rtl (current_function_decl, insns);
2673 #ifdef SETJMP_VIA_SAVE_AREA
2674 /* This must be performed before virtual register instantiation.
2675 Please be aware the everything in the compiler that can look
2676 at the RTL up to this point must understand that REG_SAVE_AREA
2677 is just like a use of the REG contained inside. */
2678 if (current_function_calls_alloca)
2679 optimize_save_area_alloca (insns);
2682 /* Instantiate all virtual registers. */
2683 instantiate_virtual_regs (current_function_decl, insns);
2685 open_dump_file (DFI_jump, decl);
2687 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2688 are initialized and to compute whether control can drop off the end
2691 timevar_push (TV_JUMP);
2692 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2693 before jump optimization switches branch directions. */
2694 if (flag_guess_branch_prob)
2695 expected_value_to_br_prob ();
2697 reg_scan (insns, max_reg_num (), 0);
2698 rebuild_jump_labels (insns);
2699 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2701 dump_flow_info (rtl_dump_file);
2702 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2703 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2705 /* CFG is no longer maintained up-to-date. */
2706 free_bb_for_insn ();
2707 copy_loop_headers (insns);
2708 purge_line_number_notes (insns);
2709 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2711 timevar_pop (TV_JUMP);
2712 close_dump_file (DFI_jump, print_rtl, insns);
2714 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2715 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2717 goto exit_rest_of_compilation;
2720 /* Long term, this should probably move before the jump optimizer too,
2721 but I didn't want to disturb the rtl_dump_and_exit and related
2722 stuff at this time. */
2723 if (optimize > 0 && flag_ssa)
2725 /* Convert to SSA form. */
2727 timevar_push (TV_TO_SSA);
2728 open_dump_file (DFI_ssa, decl);
2730 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2733 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2734 timevar_pop (TV_TO_SSA);
2736 /* Perform sparse conditional constant propagation, if requested. */
2739 timevar_push (TV_SSA_CCP);
2740 open_dump_file (DFI_ssa_ccp, decl);
2744 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2745 timevar_pop (TV_SSA_CCP);
2748 /* It would be useful to cleanup the CFG at this point, but block
2749 merging and possibly other transformations might leave a PHI
2750 node in the middle of a basic block, which is a strict no-no. */
2752 /* The SSA implementation uses basic block numbers in its phi
2753 nodes. Thus, changing the control-flow graph or the basic
2754 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2755 may cause problems. */
2759 /* Remove dead code. */
2761 timevar_push (TV_SSA_DCE);
2762 open_dump_file (DFI_ssa_dce, decl);
2764 insns = get_insns ();
2765 ssa_eliminate_dead_code ();
2767 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2768 timevar_pop (TV_SSA_DCE);
2771 /* Convert from SSA form. */
2773 timevar_push (TV_FROM_SSA);
2774 open_dump_file (DFI_ussa, decl);
2776 convert_from_ssa ();
2777 /* New registers have been created. Rescan their usage. */
2778 reg_scan (insns, max_reg_num (), 1);
2780 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2781 timevar_pop (TV_FROM_SSA);
2786 timevar_push (TV_JUMP);
2787 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP: 0);
2789 /* Try to identify useless null pointer tests and delete them. */
2790 if (flag_delete_null_pointer_checks)
2792 open_dump_file (DFI_null, decl);
2794 dump_flow_info (rtl_dump_file);
2796 if (delete_null_pointer_checks (insns))
2797 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2799 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2802 /* Jump optimization, and the removal of NULL pointer checks, may
2803 have reduced the number of instructions substantially. CSE, and
2804 future passes, allocate arrays whose dimensions involve the
2805 maximum instruction UID, so if we can reduce the maximum UID
2806 we'll save big on memory. */
2807 renumber_insns (rtl_dump_file);
2808 timevar_pop (TV_JUMP);
2810 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2814 /* Perform common subexpression elimination.
2815 Nonzero value from `cse_main' means that jumps were simplified
2816 and some code may now be unreachable, so do
2817 jump optimization again. */
2821 open_dump_file (DFI_cse, decl);
2823 dump_flow_info (rtl_dump_file);
2824 timevar_push (TV_CSE);
2826 reg_scan (insns, max_reg_num (), 1);
2828 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2830 rebuild_jump_labels (insns);
2831 purge_all_dead_edges (0);
2833 delete_trivially_dead_insns (insns, max_reg_num ());
2835 /* If we are not running more CSE passes, then we are no longer
2836 expecting CSE to be run. But always rerun it in a cheap mode. */
2837 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2839 if (tem || optimize > 1)
2840 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2841 /* Try to identify useless null pointer tests and delete them. */
2842 if (flag_delete_null_pointer_checks)
2844 timevar_push (TV_JUMP);
2846 if (delete_null_pointer_checks (insns))
2847 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2848 timevar_pop (TV_JUMP);
2851 /* The second pass of jump optimization is likely to have
2852 removed a bunch more instructions. */
2853 renumber_insns (rtl_dump_file);
2855 timevar_pop (TV_CSE);
2856 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2859 open_dump_file (DFI_addressof, decl);
2861 purge_addressof (insns);
2863 purge_all_dead_edges (0);
2864 reg_scan (insns, max_reg_num (), 1);
2866 close_dump_file (DFI_addressof, print_rtl, insns);
2870 /* Perform global cse. */
2872 if (optimize > 0 && flag_gcse)
2874 int save_csb, save_cfj;
2877 timevar_push (TV_GCSE);
2878 open_dump_file (DFI_gcse, decl);
2880 tem = gcse_main (insns, rtl_dump_file);
2881 rebuild_jump_labels (insns);
2882 delete_trivially_dead_insns (insns, max_reg_num ());
2884 save_csb = flag_cse_skip_blocks;
2885 save_cfj = flag_cse_follow_jumps;
2886 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2888 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2890 if (flag_expensive_optimizations)
2892 timevar_push (TV_CSE);
2893 reg_scan (insns, max_reg_num (), 1);
2894 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2895 purge_all_dead_edges (0);
2896 delete_trivially_dead_insns (insns, max_reg_num ());
2897 timevar_pop (TV_CSE);
2898 cse_not_expected = !flag_rerun_cse_after_loop;
2901 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2902 things up. Then possibly re-run CSE again. */
2906 timevar_push (TV_JUMP);
2907 rebuild_jump_labels (insns);
2908 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2909 timevar_pop (TV_JUMP);
2911 if (flag_expensive_optimizations)
2913 timevar_push (TV_CSE);
2914 reg_scan (insns, max_reg_num (), 1);
2915 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2916 purge_all_dead_edges (0);
2917 delete_trivially_dead_insns (insns, max_reg_num ());
2918 timevar_pop (TV_CSE);
2922 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2923 timevar_pop (TV_GCSE);
2926 flag_cse_skip_blocks = save_csb;
2927 flag_cse_follow_jumps = save_cfj;
2928 #ifdef ENABLE_CHECKING
2929 verify_flow_info ();
2933 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2934 if (optimize > 0 && flag_gcse && current_function_calls_constant_p)
2935 purge_builtin_constant_p ();
2937 /* Move constant computations out of loops. */
2939 if (optimize > 0 && flag_loop_optimize)
2941 int do_unroll, do_prefetch;
2943 timevar_push (TV_LOOP);
2944 delete_dead_jumptables ();
2945 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2946 open_dump_file (DFI_loop, decl);
2947 /* CFG is no longer maintained up-to-date. */
2948 free_bb_for_insn ();
2950 do_unroll = flag_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2951 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2952 if (flag_rerun_loop_opt)
2954 cleanup_barriers ();
2956 /* We only want to perform unrolling once. */
2957 loop_optimize (insns, rtl_dump_file, do_unroll);
2960 /* The first call to loop_optimize makes some instructions
2961 trivially dead. We delete those instructions now in the
2962 hope that doing so will make the heuristics in loop work
2963 better and possibly speed up compilation. */
2964 delete_trivially_dead_insns (insns, max_reg_num ());
2966 /* The regscan pass is currently necessary as the alias
2967 analysis code depends on this information. */
2968 reg_scan (insns, max_reg_num (), 1);
2970 cleanup_barriers ();
2971 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2973 /* Loop can create trivially dead instructions. */
2974 delete_trivially_dead_insns (insns, max_reg_num ());
2975 close_dump_file (DFI_loop, print_rtl, insns);
2976 timevar_pop (TV_LOOP);
2977 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2982 /* Perform jump bypassing and control flow optimizations. */
2983 if (optimize > 0 && flag_gcse)
2985 timevar_push (TV_BYPASS);
2986 open_dump_file (DFI_bypass, decl);
2988 cleanup_cfg (CLEANUP_EXPENSIVE);
2989 tem = bypass_jumps (rtl_dump_file);
2993 rebuild_jump_labels (insns);
2994 cleanup_cfg (CLEANUP_EXPENSIVE);
2995 delete_trivially_dead_insns (insns, max_reg_num ());
2998 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2999 timevar_pop (TV_BYPASS);
3003 #ifdef ENABLE_CHECKING
3004 verify_flow_info ();
3008 /* Do control and data flow analysis; wrote some of the results to
3011 timevar_push (TV_FLOW);
3012 open_dump_file (DFI_cfg, decl);
3014 dump_flow_info (rtl_dump_file);
3015 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
3016 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3018 /* It may make more sense to mark constant functions after dead code is
3019 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3020 may insert code making function non-constant, but we still must consider
3021 it as constant, otherwise -fbranch-probabilities will not read data back.
3023 life_analysis rarely eliminates modification of external memory.
3026 mark_constant_function ();
3028 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3030 /* Do branch profiling and static profile estimation passes. */
3031 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3035 timevar_push (TV_BRANCH_PROB);
3036 open_dump_file (DFI_bp, decl);
3037 if (cfun->arc_profile || flag_branch_probabilities)
3040 /* Discover and record the loop depth at the head of each basic
3041 block. The loop infrastructure does the real job for us. */
3042 flow_loops_find (&loops, LOOP_TREE);
3045 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3047 /* Estimate using heuristics if no profiling info is available. */
3048 if (flag_guess_branch_prob)
3049 estimate_probability (&loops);
3051 flow_loops_free (&loops);
3052 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3053 timevar_pop (TV_BRANCH_PROB);
3057 open_dump_file (DFI_ce1, decl);
3058 if (flag_if_conversion)
3060 timevar_push (TV_IFCVT);
3062 dump_flow_info (rtl_dump_file);
3063 cleanup_cfg (CLEANUP_EXPENSIVE);
3064 reg_scan (insns, max_reg_num (), 0);
3066 timevar_pop (TV_IFCVT);
3068 timevar_push (TV_JUMP);
3069 cleanup_cfg (CLEANUP_EXPENSIVE);
3070 reg_scan (insns, max_reg_num (), 0);
3071 timevar_pop (TV_JUMP);
3072 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3076 timevar_push (TV_TRACER);
3077 open_dump_file (DFI_tracer, decl);
3079 dump_flow_info (rtl_dump_file);
3081 cleanup_cfg (CLEANUP_EXPENSIVE);
3082 reg_scan (insns, max_reg_num (), 0);
3083 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3084 timevar_pop (TV_TRACER);
3087 /* Perform loop optimalizations. It might be better to do them a bit
3088 sooner, but we want the profile feedback to work more efficiently. */
3090 && flag_unswitch_loops)
3092 struct loops *loops;
3093 timevar_push (TV_LOOP);
3094 open_dump_file (DFI_loop2, decl);
3096 dump_flow_info (rtl_dump_file);
3098 loops = loop_optimizer_init (rtl_dump_file);
3102 /* The optimalizations: */
3103 if (flag_unswitch_loops)
3104 unswitch_loops (loops);
3106 loop_optimizer_finalize (loops, rtl_dump_file);
3109 cleanup_cfg (CLEANUP_EXPENSIVE);
3110 delete_trivially_dead_insns (insns, max_reg_num ());
3111 reg_scan (insns, max_reg_num (), 0);
3113 dump_flow_info (rtl_dump_file);
3114 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3115 timevar_pop (TV_LOOP);
3119 if (flag_rerun_cse_after_loop)
3121 timevar_push (TV_CSE2);
3122 open_dump_file (DFI_cse2, decl);
3124 dump_flow_info (rtl_dump_file);
3125 /* CFG is no longer maintained up-to-date. */
3126 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3127 purge_all_dead_edges (0);
3128 delete_trivially_dead_insns (insns, max_reg_num ());
3132 timevar_push (TV_JUMP);
3133 rebuild_jump_labels (insns);
3134 cleanup_cfg (CLEANUP_EXPENSIVE);
3135 timevar_pop (TV_JUMP);
3137 reg_scan (insns, max_reg_num (), 0);
3138 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3140 timevar_pop (TV_CSE2);
3143 cse_not_expected = 1;
3145 open_dump_file (DFI_life, decl);
3148 check_function_return_warnings ();
3150 #ifdef ENABLE_CHECKING
3151 verify_flow_info ();
3153 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3155 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3156 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3157 timevar_pop (TV_FLOW);
3161 if (warn_uninitialized || extra_warnings)
3163 uninitialized_vars_warning (DECL_INITIAL (decl));
3165 setjmp_args_warning ();
3171 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3173 /* Insns were inserted, so things might look a bit different. */
3174 insns = get_insns ();
3175 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3176 PROP_LOG_LINKS | PROP_REG_INFO
3177 | PROP_DEATH_NOTES);
3181 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3185 /* If -opt, try combining insns through substitution. */
3189 int rebuild_jump_labels_after_combine = 0;
3191 timevar_push (TV_COMBINE);
3192 open_dump_file (DFI_combine, decl);
3194 rebuild_jump_labels_after_combine
3195 = combine_instructions (insns, max_reg_num ());
3197 /* Combining insns may have turned an indirect jump into a
3198 direct jump. Rebuild the JUMP_LABEL fields of jumping
3200 if (rebuild_jump_labels_after_combine)
3202 timevar_push (TV_JUMP);
3203 rebuild_jump_labels (insns);
3204 timevar_pop (TV_JUMP);
3206 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3209 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3210 timevar_pop (TV_COMBINE);
3215 /* Rerun if-conversion, as combine may have simplified things enough to
3216 now meet sequence length restrictions. */
3217 if (flag_if_conversion)
3219 timevar_push (TV_IFCVT);
3220 open_dump_file (DFI_ce2, decl);
3226 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3227 timevar_pop (TV_IFCVT);
3230 /* Register allocation pre-pass, to reduce number of moves
3231 necessary for two-address machines. */
3232 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3234 timevar_push (TV_REGMOVE);
3235 open_dump_file (DFI_regmove, decl);
3237 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3239 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3240 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3241 timevar_pop (TV_REGMOVE);
3246 /* Do unconditional splitting before register allocation to allow machine
3247 description to add extra information not needed previously. */
3248 split_all_insns (1);
3250 #ifdef OPTIMIZE_MODE_SWITCHING
3251 timevar_push (TV_MODE_SWITCH);
3254 optimize_mode_switching (NULL);
3257 timevar_pop (TV_MODE_SWITCH);
3260 /* Any of the several passes since flow1 will have munged register
3261 lifetime data a bit. We need it to be up to date for scheduling
3262 (see handling of reg_known_equiv in init_alias_analysis). */
3263 recompute_reg_usage (insns, !optimize_size);
3265 timevar_push (TV_SCHED);
3267 #ifdef INSN_SCHEDULING
3269 /* Print function header into sched dump now
3270 because doing the sched analysis makes some of the dump. */
3271 if (optimize > 0 && flag_schedule_insns)
3273 open_dump_file (DFI_sched, decl);
3275 /* Do control and data sched analysis,
3276 and write some of the results to dump file. */
3278 schedule_insns (rtl_dump_file);
3280 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3283 timevar_pop (TV_SCHED);
3287 /* Determine if the current function is a leaf before running reload
3288 since this can impact optimizations done by the prologue and
3289 epilogue thus changing register elimination offsets. */
3290 current_function_is_leaf = leaf_function_p ();
3292 timevar_push (TV_LOCAL_ALLOC);
3293 open_dump_file (DFI_lreg, decl);
3295 /* Allocate pseudo-regs that are used only within 1 basic block.
3297 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3298 jump optimizer after register allocation and reloading are finished. */
3300 if (flag_new_regalloc)
3302 delete_trivially_dead_insns (insns, max_reg_num ());
3305 timevar_pop (TV_LOCAL_ALLOC);
3306 if (dump_file[DFI_lreg].enabled)
3308 timevar_push (TV_DUMP);
3310 close_dump_file (DFI_lreg, NULL, NULL);
3311 timevar_pop (TV_DUMP);
3314 /* XXX clean up the whole mess to bring live info in shape again. */
3315 timevar_push (TV_GLOBAL_ALLOC);
3316 open_dump_file (DFI_greg, decl);
3318 build_insn_chain (insns);
3319 failure = reload (insns, 0);
3321 timevar_pop (TV_GLOBAL_ALLOC);
3323 if (dump_file[DFI_greg].enabled)
3325 timevar_push (TV_DUMP);
3327 dump_global_regs (rtl_dump_file);
3329 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3330 timevar_pop (TV_DUMP);
3334 goto exit_rest_of_compilation;
3335 reload_completed = 1;
3336 rebuild_label_notes_after_reload = 0;
3340 /* Allocate the reg_renumber array. */
3341 allocate_reg_info (max_regno, FALSE, TRUE);
3343 /* And the reg_equiv_memory_loc array. */
3344 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3346 allocate_initial_values (reg_equiv_memory_loc);
3348 regclass (insns, max_reg_num (), rtl_dump_file);
3349 rebuild_label_notes_after_reload = local_alloc ();
3351 timevar_pop (TV_LOCAL_ALLOC);
3353 if (dump_file[DFI_lreg].enabled)
3355 timevar_push (TV_DUMP);
3357 dump_flow_info (rtl_dump_file);
3358 dump_local_alloc (rtl_dump_file);
3360 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3361 timevar_pop (TV_DUMP);
3366 timevar_push (TV_GLOBAL_ALLOC);
3367 open_dump_file (DFI_greg, decl);
3369 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3370 pass fixing up any insns that are invalid. */
3373 failure = global_alloc (rtl_dump_file);
3376 build_insn_chain (insns);
3377 failure = reload (insns, 0);
3380 timevar_pop (TV_GLOBAL_ALLOC);
3382 if (dump_file[DFI_greg].enabled)
3384 timevar_push (TV_DUMP);
3386 dump_global_regs (rtl_dump_file);
3388 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3389 timevar_pop (TV_DUMP);
3393 goto exit_rest_of_compilation;
3398 open_dump_file (DFI_postreload, decl);
3400 /* Do a very simple CSE pass over just the hard registers. */
3403 timevar_push (TV_RELOAD_CSE_REGS);
3404 reload_cse_regs (insns);
3405 timevar_pop (TV_RELOAD_CSE_REGS);
3408 /* Register allocation and reloading may have turned an indirect jump into
3409 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3410 jumping instructions. */
3411 if (rebuild_label_notes_after_reload)
3413 timevar_push (TV_JUMP);
3415 rebuild_jump_labels (insns);
3416 purge_all_dead_edges (0);
3418 timevar_pop (TV_JUMP);
3421 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3423 /* Re-create the death notes which were deleted during reload. */
3424 timevar_push (TV_FLOW2);
3425 open_dump_file (DFI_flow2, decl);
3427 #ifdef ENABLE_CHECKING
3428 verify_flow_info ();
3431 /* If optimizing, then go ahead and split insns now. */
3433 split_all_insns (0);
3435 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3437 /* On some machines, the prologue and epilogue code, or parts thereof,
3438 can be represented as RTL. Doing so lets us schedule insns between
3439 it and the rest of the code and also allows delayed branch
3440 scheduling to operate in the epilogue. */
3441 thread_prologue_and_epilogue_insns (insns);
3445 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3446 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3447 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3449 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3450 even for machines with possibly nonzero RETURN_POPS_ARGS
3451 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3452 push instructions will have popping returns. */
3453 #ifndef PUSH_ROUNDING
3454 if (!ACCUMULATE_OUTGOING_ARGS)
3456 combine_stack_adjustments ();
3461 flow2_completed = 1;
3463 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3464 timevar_pop (TV_FLOW2);
3466 #ifdef HAVE_peephole2
3467 if (optimize > 0 && flag_peephole2)
3469 timevar_push (TV_PEEPHOLE2);
3470 open_dump_file (DFI_peephole2, decl);
3472 peephole2_optimize (rtl_dump_file);
3474 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3475 timevar_pop (TV_PEEPHOLE2);
3479 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3481 timevar_push (TV_RENAME_REGISTERS);
3482 open_dump_file (DFI_rnreg, decl);
3484 if (flag_rename_registers)
3485 regrename_optimize ();
3486 if (flag_cprop_registers)
3487 copyprop_hardreg_forward ();
3489 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3490 timevar_pop (TV_RENAME_REGISTERS);
3493 if (flag_if_conversion2)
3495 timevar_push (TV_IFCVT2);
3496 open_dump_file (DFI_ce3, decl);
3500 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3501 timevar_pop (TV_IFCVT2);
3505 split_all_insns (1);
3510 timevar_push (TV_REORDER_BLOCKS);
3511 open_dump_file (DFI_bbro, decl);
3513 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3514 splitting possibly introduced more crossjumping opportunities. */
3515 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3516 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3518 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
3520 if (flag_reorder_blocks)
3521 reorder_basic_blocks ();
3522 if (flag_reorder_blocks
3523 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
3524 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3526 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3527 timevar_pop (TV_REORDER_BLOCKS);
3530 #ifdef INSN_SCHEDULING
3531 if (optimize > 0 && flag_schedule_insns_after_reload)
3533 timevar_push (TV_SCHED2);
3534 open_dump_file (DFI_sched2, decl);
3536 /* Do control and data sched analysis again,
3537 and write some more of the results to dump file. */
3539 split_all_insns (1);
3541 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
3543 schedule_ebbs (rtl_dump_file);
3544 /* No liveness updating code yet, but it should be easy to do.
3545 reg-stack recompute the liveness when needed for now. */
3546 count_or_remove_death_notes (NULL, 1);
3547 cleanup_cfg (CLEANUP_EXPENSIVE);
3550 schedule_insns (rtl_dump_file);
3552 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3553 timevar_pop (TV_SCHED2);
3559 #ifdef LEAF_REGISTERS
3560 current_function_uses_only_leaf_regs
3561 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3565 timevar_push (TV_REG_STACK);
3566 open_dump_file (DFI_stack, decl);
3568 if (reg_to_stack (insns, rtl_dump_file) && optimize)
3570 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3571 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
3572 && flag_reorder_blocks)
3574 reorder_basic_blocks ();
3575 cleanup_cfg (CLEANUP_EXPENSIVE);
3579 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3580 timevar_pop (TV_REG_STACK);
3586 timevar_push (TV_REORDER_BLOCKS);
3587 open_dump_file (DFI_bbro, decl);
3589 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3590 splitting possibly introduced more crossjumping opportunities.
3591 Except that we can't actually run crossjumping without running
3592 another DCE pass, which we can't do after reg-stack. */
3593 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3594 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3595 if (flag_reorder_blocks)
3597 reorder_basic_blocks ();
3598 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3601 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3602 timevar_pop (TV_REORDER_BLOCKS);
3604 compute_alignments ();
3606 /* CFG is no longer maintained up-to-date. */
3607 free_bb_for_insn ();
3609 /* If a machine dependent reorganization is needed, call it. */
3610 #ifdef MACHINE_DEPENDENT_REORG
3611 timevar_push (TV_MACH_DEP);
3612 open_dump_file (DFI_mach, decl);
3614 MACHINE_DEPENDENT_REORG (insns);
3616 close_dump_file (DFI_mach, print_rtl, insns);
3617 timevar_pop (TV_MACH_DEP);
3622 purge_line_number_notes (insns);
3623 cleanup_barriers ();
3625 /* If a scheduling pass for delayed branches is to be done,
3626 call the scheduling code. */
3629 if (optimize > 0 && flag_delayed_branch)
3631 timevar_push (TV_DBR_SCHED);
3632 open_dump_file (DFI_dbr, decl);
3634 dbr_schedule (insns, rtl_dump_file);
3636 close_dump_file (DFI_dbr, print_rtl, insns);
3637 timevar_pop (TV_DBR_SCHED);
3643 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3644 timevar_push (TV_SHORTEN_BRANCH);
3645 split_all_insns_noflow ();
3646 timevar_pop (TV_SHORTEN_BRANCH);
3649 convert_to_eh_region_ranges ();
3651 /* Shorten branches. */
3652 timevar_push (TV_SHORTEN_BRANCH);
3653 shorten_branches (get_insns ());
3654 timevar_pop (TV_SHORTEN_BRANCH);
3656 set_nothrow_function_flags ();
3657 if (current_function_nothrow)
3658 /* Now we know that this can't throw; set the flag for the benefit
3659 of other functions later in this translation unit. */
3660 TREE_NOTHROW (current_function_decl) = 1;
3662 /* Now turn the rtl into assembler code. */
3664 timevar_push (TV_FINAL);
3669 /* Get the function's name, as described by its RTL. This may be
3670 different from the DECL_NAME name used in the source file. */
3672 x = DECL_RTL (decl);
3673 if (GET_CODE (x) != MEM)
3676 if (GET_CODE (x) != SYMBOL_REF)
3678 fnname = XSTR (x, 0);
3680 assemble_start_function (decl, fnname);
3681 final_start_function (insns, asm_out_file, optimize);
3682 final (insns, asm_out_file, optimize, 0);
3683 final_end_function ();
3685 #ifdef IA64_UNWIND_INFO
3686 /* ??? The IA-64 ".handlerdata" directive must be issued before
3687 the ".endp" directive that closes the procedure descriptor. */
3688 output_function_exception_table ();
3691 assemble_end_function (decl, fnname);
3693 #ifndef IA64_UNWIND_INFO
3694 /* Otherwise, it feels unclean to switch sections in the middle. */
3695 output_function_exception_table ();
3699 fflush (asm_out_file);
3701 /* Release all memory allocated by flow. */
3702 free_basic_block_vars (0);
3704 /* Release all memory held by regsets now. */
3705 regset_release_memory ();
3707 timevar_pop (TV_FINAL);
3711 /* Write DBX symbols if requested. */
3713 /* Note that for those inline functions where we don't initially
3714 know for certain that we will be generating an out-of-line copy,
3715 the first invocation of this routine (rest_of_compilation) will
3716 skip over this code by doing a `goto exit_rest_of_compilation;'.
3717 Later on, wrapup_global_declarations will (indirectly) call
3718 rest_of_compilation again for those inline functions that need
3719 to have out-of-line copies generated. During that call, we
3720 *will* be routed past here. */
3722 timevar_push (TV_SYMOUT);
3723 (*debug_hooks->function_decl) (decl);
3724 timevar_pop (TV_SYMOUT);
3726 exit_rest_of_compilation:
3728 /* In case the function was not output,
3729 don't leave any temporary anonymous types
3730 queued up for sdb output. */
3731 #ifdef SDB_DEBUGGING_INFO
3732 if (write_symbols == SDB_DEBUG)
3733 sdbout_types (NULL_TREE);
3736 reload_completed = 0;
3737 flow2_completed = 0;
3740 timevar_push (TV_FINAL);
3742 /* Clear out the insn_length contents now that they are no
3744 init_insn_lengths ();
3746 /* Show no temporary slots allocated. */
3749 free_basic_block_vars (0);
3750 free_bb_for_insn ();
3752 timevar_pop (TV_FINAL);
3754 /* Make sure volatile mem refs aren't considered valid operands for
3755 arithmetic insns. We must call this here if this is a nested inline
3756 function, since the above code leaves us in the init_recog state
3757 (from final.c), and the function context push/pop code does not
3758 save/restore volatile_ok.
3760 ??? Maybe it isn't necessary for expand_start_function to call this
3761 anymore if we do it here? */
3763 init_recog_no_volatile ();
3765 /* We're done with this function. Free up memory if we can. */
3766 free_after_parsing (cfun);
3767 if (! DECL_DEFER_OUTPUT (decl))
3769 free_after_compilation (cfun);
3771 /* Clear integrate.c's pointer to the cfun structure we just
3773 DECL_SAVED_INSNS (decl) = 0;
3779 timevar_pop (TV_REST_OF_COMPILATION);
3789 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3790 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3791 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3792 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3793 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3794 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"));
3795 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3797 for (i = ARRAY_SIZE (f_options); i--;)
3799 const char *description = f_options[i].description;
3801 if (description != NULL && *description != 0)
3802 printf (" -f%-21s %s\n",
3803 f_options[i].string, _(description));
3806 printf (_(" -O[number] Set optimization level to [number]\n"));
3807 printf (_(" -Os Optimize for space rather than speed\n"));
3808 for (i = LAST_PARAM; i--;)
3810 const char *description = compiler_params[i].help;
3811 const int length = 21 - strlen (compiler_params[i].option);
3813 if (description != NULL && *description != 0)
3814 printf (" --param %s=<value>%.*s%s\n",
3815 compiler_params[i].option,
3816 length > 0 ? length : 1, " ",
3819 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3820 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3821 printf (_(" -w Suppress warnings\n"));
3823 for (i = ARRAY_SIZE (W_options); i--;)
3825 const char *description = W_options[i].description;
3827 if (description != NULL && *description != 0)
3828 printf (" -W%-21s %s\n",
3829 W_options[i].string, _(description));
3832 printf (_(" -Wunused Enable unused warnings\n"));
3833 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3834 printf (_(" -p Enable function profiling\n"));
3835 printf (_(" -o <file> Place output into <file> \n"));
3837 -G <number> Put global and static data smaller than <number>\n\
3838 bytes into a special section (on some targets)\n"));
3840 for (i = ARRAY_SIZE (debug_args); i--;)
3842 if (debug_args[i].description != NULL)
3843 printf (" -g%-21s %s\n",
3844 debug_args[i].arg, _(debug_args[i].description));
3847 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3848 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3849 printf (_(" -version Display the compiler's version\n"));
3850 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3851 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3852 #if defined INSN_SCHEDULING
3853 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3855 printf (_(" --help Display this information\n"));
3860 /* Display descriptions of language specific options.
3861 If there is no description, note that there is an undocumented option.
3862 If the description is empty, do not display anything. (This allows
3863 options to be deliberately undocumented, for whatever reason).
3864 If the option string is missing, then this is a marker, indicating
3865 that the description string is in fact the name of a language, whose
3866 language specific options are to follow. */
3868 if (ARRAY_SIZE (documented_lang_options) > 1)
3870 printf (_("\nLanguage specific options:\n"));
3872 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3874 const char *description = documented_lang_options[i].description;
3875 const char *option = documented_lang_options[i].option;
3877 if (description == NULL)
3882 printf (_(" %-23.23s [undocumented]\n"), option);
3884 else if (*description == 0)
3886 else if (option == NULL)
3890 (_("\nThere are undocumented %s specific options as well.\n"),
3894 printf (_("\n Options for %s:\n"), description);
3899 printf (" %-23.23s %s\n", option, _(description));
3904 printf (_("\nThere are undocumented %s specific options as well.\n"),
3907 display_target_options ();
3911 display_target_options ()
3914 static bool displayed = false;
3916 /* Avoid double printing for --help --target-help. */
3921 if (ARRAY_SIZE (target_switches) > 1
3922 #ifdef TARGET_OPTIONS
3923 || ARRAY_SIZE (target_options) > 1
3931 printf (_("\nTarget specific options:\n"));
3933 for (i = ARRAY_SIZE (target_switches); i--;)
3935 const char *option = target_switches[i].name;
3936 const char *description = target_switches[i].description;
3938 if (option == NULL || *option == 0)
3940 else if (description == NULL)
3945 printf (_(" -m%-23.23s [undocumented]\n"), option);
3947 else if (*description != 0)
3948 doc += printf (" -m%-23.23s %s\n", option, _(description));
3951 #ifdef TARGET_OPTIONS
3952 for (i = ARRAY_SIZE (target_options); i--;)
3954 const char *option = target_options[i].prefix;
3955 const char *description = target_options[i].description;
3957 if (option == NULL || *option == 0)
3959 else if (description == NULL)
3964 printf (_(" -m%-23.23s [undocumented]\n"), option);
3966 else if (*description != 0)
3967 doc += printf (" -m%-23.23s %s\n", option, _(description));
3973 printf (_("\nThere are undocumented target specific options as well.\n"));
3975 printf (_(" They exist, but they are not documented.\n"));
3980 /* Parse a -d... command line switch. */
3983 decode_d_option (arg)
3992 for (i = 0; i < (int) DFI_MAX; ++i)
3993 dump_file[i].enabled = 1;
3999 flag_print_asm_name = 1;
4002 flag_dump_rtl_in_asm = 1;
4003 flag_print_asm_name = 1;
4006 graph_dump_format = vcg;
4009 rtl_dump_and_exit = 1;
4014 case 'D': /* These are handled by the preprocessor. */
4018 setup_core_dumping();
4023 for (i = 0; i < (int) DFI_MAX; ++i)
4024 if (c == dump_file[i].debug_switch)
4026 dump_file[i].enabled = 1;
4031 warning ("unrecognized gcc debugging option: %c", c);
4036 /* Parse a -f... command line switch. ARG is the value after the -f.
4037 It is safe to access 'ARG - 2' to generate the full switch name.
4038 Return the number of strings consumed. */
4041 decode_f_option (arg)
4045 const char *option_value = NULL;
4047 /* Search for the option in the table of binary f options. */
4048 for (j = ARRAY_SIZE (f_options); j--;)
4050 if (!strcmp (arg, f_options[j].string))
4052 *f_options[j].variable = f_options[j].on_value;
4056 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4057 && ! strcmp (arg + 3, f_options[j].string))
4059 *f_options[j].variable = ! f_options[j].on_value;
4064 if (!strcmp (arg, "fast-math"))
4065 set_fast_math_flags (1);
4066 else if (!strcmp (arg, "no-fast-math"))
4067 set_fast_math_flags (0);
4068 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4069 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4072 read_integral_parameter (option_value, arg - 2,
4074 set_param_value ("max-inline-insns", val);
4076 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4078 if (strcmp (option_value, "global-dynamic") == 0)
4079 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4080 else if (strcmp (option_value, "local-dynamic") == 0)
4081 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4082 else if (strcmp (option_value, "initial-exec") == 0)
4083 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4084 else if (strcmp (option_value, "local-exec") == 0)
4085 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4087 warning ("`%s': unknown tls-model option", arg - 2);
4089 #ifdef INSN_SCHEDULING
4090 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4091 fix_sched_param ("verbose", option_value);
4093 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4094 fix_register (option_value, 1, 1);
4095 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4096 fix_register (option_value, 0, 1);
4097 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4098 fix_register (option_value, 0, 0);
4099 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4100 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4101 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4103 = read_integral_parameter (option_value, arg - 2, align_functions);
4104 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4105 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4106 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4108 = read_integral_parameter (option_value, arg - 2, align_labels);
4109 else if ((option_value
4110 = skip_leading_substring (arg, "stack-limit-register=")))
4112 int reg = decode_reg_name (option_value);
4114 error ("unrecognized register name `%s'", option_value);
4116 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4118 else if ((option_value
4119 = skip_leading_substring (arg, "stack-limit-symbol=")))
4122 nm = ggc_strdup (option_value);
4123 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4125 else if ((option_value
4126 = skip_leading_substring (arg, "message-length=")))
4127 output_set_maximum_length
4128 (&global_dc->buffer, read_integral_parameter
4129 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4130 else if ((option_value
4131 = skip_leading_substring (arg, "diagnostics-show-location=")))
4133 if (!strcmp (option_value, "once"))
4134 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4135 else if (!strcmp (option_value, "every-line"))
4136 diagnostic_prefixing_rule (global_dc)
4137 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4139 error ("unrecognized option `%s'", arg - 2);
4141 else if (!strcmp (arg, "no-stack-limit"))
4142 stack_limit_rtx = NULL_RTX;
4143 else if (!strcmp (arg, "preprocessed"))
4144 /* Recognize this switch but do nothing. This prevents warnings
4145 about an unrecognized switch if cpplib has not been linked in. */
4153 /* Parse a -W... command line switch. ARG is the value after the -W.
4154 It is safe to access 'ARG - 2' to generate the full switch name.
4155 Return the number of strings consumed. */
4158 decode_W_option (arg)
4161 const char *option_value = NULL;
4164 /* Search for the option in the table of binary W options. */
4166 for (j = ARRAY_SIZE (W_options); j--;)
4168 if (!strcmp (arg, W_options[j].string))
4170 *W_options[j].variable = W_options[j].on_value;
4174 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4175 && ! strcmp (arg + 3, W_options[j].string))
4177 *W_options[j].variable = ! W_options[j].on_value;
4182 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4183 warning ("-Wid-clash-LEN is no longer supported");
4184 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4186 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4188 warn_larger_than = larger_than_size != -1;
4190 else if (!strcmp (arg, "unused"))
4194 else if (!strcmp (arg, "no-unused"))
4198 else if (!strcmp (arg, "extra"))
4200 /* We save the value of warn_uninitialized, since if they put
4201 -Wuninitialized on the command line, we need to generate a
4202 warning about not using it without also specifying -O. */
4203 if (warn_uninitialized != 1)
4204 warn_uninitialized = 2;
4212 /* Parse a -g... command line switch. ARG is the value after the -g.
4213 It is safe to access 'ARG - 2' to generate the full switch name.
4214 Return the number of strings consumed. */
4217 decode_g_option (arg)
4220 static unsigned level = 0;
4221 /* A lot of code assumes write_symbols == NO_DEBUG if the
4222 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4223 of what debugging type has been selected). This records the
4224 selected type. It is an error to specify more than one
4226 static enum debug_info_type selected_debug_type = NO_DEBUG;
4227 /* Nonzero if debugging format has been explicitly set.
4228 -g and -ggdb don't explicitly set the debugging format so
4229 -gdwarf -g3 is equivalent to -gdwarf3. */
4230 static int type_explicitly_set_p = 0;
4231 /* Indexed by enum debug_info_type. */
4232 static const char *const debug_type_names[] =
4234 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4237 /* The maximum admissible debug level value. */
4238 static const unsigned max_debug_level = 3;
4240 /* Look up ARG in the table. */
4241 for (da = debug_args; da->arg; da++)
4243 const int da_len = strlen (da->arg);
4245 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4247 enum debug_info_type type = da->debug_type;
4248 const char *p = arg + da_len;
4250 if (*p && ! ISDIGIT (*p))
4253 /* A debug flag without a level defaults to level 2.
4254 Note we do not want to call read_integral_parameter
4255 for that case since it will call atoi which
4258 ??? We may want to generalize the interface to
4259 read_integral_parameter to better handle this case
4260 if this case shows up often. */
4262 level = read_integral_parameter (p, 0, max_debug_level + 1);
4264 level = (level == 0) ? 2 : level;
4266 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4268 error ("use -gdwarf -g%d for DWARF v1, level %d",
4271 error ("use -gdwarf-2 for DWARF v2");
4274 if (level > max_debug_level)
4277 ignoring option `%s' due to invalid debug level specification",
4279 level = debug_info_level;
4282 if (type == NO_DEBUG)
4284 type = PREFERRED_DEBUGGING_TYPE;
4286 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4288 #ifdef DWARF2_DEBUGGING_INFO
4289 type = DWARF2_DEBUG;
4291 #ifdef DBX_DEBUGGING_INFO
4298 if (type == NO_DEBUG)
4299 warning ("`%s': unknown or unsupported -g option", arg - 2);
4301 /* Does it conflict with an already selected type? */
4302 if (type_explicitly_set_p
4303 /* -g/-ggdb don't conflict with anything. */
4304 && da->debug_type != NO_DEBUG
4305 && type != selected_debug_type)
4306 warning ("`%s' ignored, conflicts with `-g%s'",
4307 arg - 2, debug_type_names[(int) selected_debug_type]);
4310 /* If the format has already been set, -g/-ggdb
4311 only change the debug level. */
4312 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4313 /* Don't change debugging type. */
4317 selected_debug_type = type;
4318 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4321 write_symbols = (level == 0
4323 : selected_debug_type);
4324 use_gnu_debug_info_extensions = da->use_extensions_p;
4325 debug_info_level = (enum debug_info_level) level;
4338 /* Decode the first argument in the argv as a language-independent option.
4339 Return the number of strings consumed. */
4342 independent_decode_option (argc, argv)
4346 char *arg = argv[0];
4348 if (arg[0] != '-' || arg[1] == 0)
4360 if (!strcmp (arg, "-help"))
4363 exit_after_options = 1;
4366 if (!strcmp (arg, "-target-help"))
4368 display_target_options ();
4369 exit_after_options = 1;
4372 if (!strcmp (arg, "-version"))
4374 print_version (stderr, "");
4375 exit_after_options = 1;
4378 /* Handle '--param <name>=<value>'. */
4379 if (strcmp (arg, "-param") == 0)
4385 error ("-param option missing argument");
4389 /* Get the '<name>=<value>' parameter. */
4391 /* Look for the `='. */
4392 equal = strchr (arg, '=');
4394 error ("invalid --param option: %s", arg);
4399 /* Zero out the `=' sign so that we get two separate strings. */
4401 /* Figure out what value is specified. */
4402 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4403 if (val != INVALID_PARAM_VAL)
4404 set_param_value (arg, val);
4406 error ("invalid parameter value `%s'", equal + 1);
4421 /* Already been treated in main (). Do nothing. */
4425 set_target_switch (arg + 1);
4429 return decode_f_option (arg + 1);
4432 return decode_g_option (arg + 1);
4435 if (!strcmp (arg, "dumpbase"))
4441 dump_base_name = argv[1];
4446 decode_d_option (arg + 1);
4450 if (!strcmp (arg, "pedantic"))
4452 else if (!strcmp (arg, "pedantic-errors"))
4453 flag_pedantic_errors = pedantic = 1;
4454 else if (arg[1] == 0)
4461 if (!strcmp (arg, "quiet"))
4468 if (!strcmp (arg, "version"))
4476 inhibit_warnings = 1;
4485 /* We save the value of warn_uninitialized, since if they put
4486 -Wuninitialized on the command line, we need to generate a
4487 warning about not using it without also specifying -O. */
4488 if (warn_uninitialized != 1)
4489 warn_uninitialized = 2;
4492 return decode_W_option (arg + 1);
4496 if (!strncmp (arg, "aux-info", 8))
4503 aux_info_file_name = argv[1];
4504 flag_gen_aux_info = 1;
4507 else if (arg[8] == '=')
4509 aux_info_file_name = arg + 9;
4510 flag_gen_aux_info = 1;
4515 else if (!strcmp (arg, "auxbase"))
4521 aux_base_name = argv[1];
4525 else if (!strcmp (arg, "auxbase-strip"))
4532 strip_off_ending (argv[1], strlen (argv[1]));
4534 aux_base_name = argv[1];
4549 asm_file_name = argv[1];
4564 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4569 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4573 if (g_switch_val == -1)
4577 g_switch_set = TRUE;
4578 g_switch_value = g_switch_val;
4588 /* Decode -m switches. */
4589 /* Decode the switch -mNAME. */
4592 set_target_switch (name)
4596 int valid_target_option = 0;
4598 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4599 if (!strcmp (target_switches[j].name, name))
4601 if (target_switches[j].value < 0)
4602 target_flags &= ~-target_switches[j].value;
4604 target_flags |= target_switches[j].value;
4607 if (target_switches[j].value < 0)
4608 target_flags_explicit |= -target_switches[j].value;
4610 target_flags_explicit |= target_switches[j].value;
4612 valid_target_option = 1;
4615 #ifdef TARGET_OPTIONS
4616 if (!valid_target_option)
4617 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4619 int len = strlen (target_options[j].prefix);
4620 if (!strncmp (target_options[j].prefix, name, len))
4622 *target_options[j].variable = name + len;
4623 valid_target_option = 1;
4628 if (!valid_target_option)
4629 error ("invalid option `%s'", name);
4632 /* Print version information to FILE.
4633 Each line begins with INDENT (for the case where FILE is the
4634 assembler output file). */
4637 print_version (file, indent)
4642 #define __VERSION__ "[?]"
4646 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4648 "%s%s%s version %s (%s) compiled by CC.\n"
4650 , indent, *indent != 0 ? " " : "",
4651 lang_hooks.name, version_string, TARGET_NAME,
4652 indent, __VERSION__);
4655 /* Print an option value and return the adjusted position in the line.
4656 ??? We don't handle error returns from fprintf (disk full); presumably
4657 other code will catch a disk full though. */
4660 print_single_switch (file, pos, max, indent, sep, term, type, name)
4663 const char *indent, *sep, *term, *type, *name;
4665 /* The ultrix fprintf returns 0 on success, so compute the result we want
4666 here since we need it for the following test. */
4667 int len = strlen (sep) + strlen (type) + strlen (name);
4672 fprintf (file, "%s", term);
4677 fprintf (file, "%s", indent);
4678 pos = strlen (indent);
4680 fprintf (file, "%s%s%s", sep, type, name);
4685 /* Print active target switches to FILE.
4686 POS is the current cursor position and MAX is the size of a "line".
4687 Each line begins with INDENT and ends with TERM.
4688 Each switch is separated from the next by SEP. */
4691 print_switch_values (file, pos, max, indent, sep, term)
4694 const char *indent, *sep, *term;
4699 /* Print the options as passed. */
4701 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4702 _("options passed: "), "");
4704 for (p = &save_argv[1]; *p != NULL; p++)
4708 if (strcmp (*p, "-o") == 0)
4714 if (strcmp (*p, "-quiet") == 0)
4716 if (strcmp (*p, "-version") == 0)
4721 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4724 fprintf (file, "%s", term);
4726 /* Print the -f and -m options that have been enabled.
4727 We don't handle language specific options but printing argv
4730 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4731 _("options enabled: "), "");
4733 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4734 if (*f_options[j].variable == f_options[j].on_value)
4735 pos = print_single_switch (file, pos, max, indent, sep, term,
4736 "-f", f_options[j].string);
4738 /* Print target specific options. */
4740 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4741 if (target_switches[j].name[0] != '\0'
4742 && target_switches[j].value > 0
4743 && ((target_switches[j].value & target_flags)
4744 == target_switches[j].value))
4746 pos = print_single_switch (file, pos, max, indent, sep, term,
4747 "-m", target_switches[j].name);
4750 #ifdef TARGET_OPTIONS
4751 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4752 if (*target_options[j].variable != NULL)
4755 sprintf (prefix, "-m%s", target_options[j].prefix);
4756 pos = print_single_switch (file, pos, max, indent, sep, term,
4757 prefix, *target_options[j].variable);
4761 fprintf (file, "%s", term);
4764 /* Open assembly code output file. Do this even if -fsyntax-only is
4765 on, because then the driver will have provided the name of a
4766 temporary file or bit bucket for us. NAME is the file specified on
4767 the command line, possibly NULL. */
4769 init_asm_output (name)
4772 if (name == NULL && asm_file_name == 0)
4773 asm_out_file = stdout;
4776 if (asm_file_name == 0)
4778 int len = strlen (dump_base_name);
4779 char *dumpname = (char *) xmalloc (len + 6);
4780 memcpy (dumpname, dump_base_name, len + 1);
4781 strip_off_ending (dumpname, len);
4782 strcat (dumpname, ".s");
4783 asm_file_name = dumpname;
4785 if (!strcmp (asm_file_name, "-"))
4786 asm_out_file = stdout;
4788 asm_out_file = fopen (asm_file_name, "w+");
4789 if (asm_out_file == 0)
4790 fatal_io_error ("can't open %s for writing", asm_file_name);
4793 #ifdef IO_BUFFER_SIZE
4794 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4795 _IOFBF, IO_BUFFER_SIZE);
4798 if (!flag_syntax_only)
4800 #ifdef ASM_FILE_START
4801 ASM_FILE_START (asm_out_file);
4804 #ifdef ASM_COMMENT_START
4805 if (flag_verbose_asm)
4807 /* Print the list of options in effect. */
4808 print_version (asm_out_file, ASM_COMMENT_START);
4809 print_switch_values (asm_out_file, 0, MAX_LINE,
4810 ASM_COMMENT_START, " ", "\n");
4811 /* Add a blank line here so it appears in assembler output but not
4813 fprintf (asm_out_file, "\n");
4819 /* Initialization of the front end environment, before command line
4820 options are parsed. Signal handlers, internationalization etc.
4821 ARGV0 is main's argv[0]. */
4823 general_init (argv0)
4828 p = argv0 + strlen (argv0);
4829 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4833 xmalloc_set_program_name (progname);
4837 gcc_init_libintl ();
4839 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4841 signal (SIGSEGV, crash_signal);
4844 signal (SIGILL, crash_signal);
4847 signal (SIGBUS, crash_signal);
4850 signal (SIGABRT, crash_signal);
4852 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4853 signal (SIGIOT, crash_signal);
4856 signal (SIGFPE, crash_signal);
4859 /* Other host-specific signal setup. */
4860 (*host_hooks.extra_signals)();
4862 /* Initialize the diagnostics reporting machinery, so option parsing
4863 can give warnings and errors. */
4864 diagnostic_initialize (global_dc);
4866 /* Initialize the garbage-collector, string pools and tree type hash
4873 /* Parse command line options and set default flag values, called
4874 after language-independent option-independent initialization. Do
4875 minimal options processing. Outputting diagnostics is OK, but GC
4876 and identifier hashtables etc. are not initialized yet.
4878 Return nonzero to suppress compiler back end initialization. */
4880 parse_options_and_default_flags (argc, argv)
4886 /* Save in case md file wants to emit args as a comment. */
4890 /* Initialize register usage now so switches may override. */
4893 /* Register the language-independent parameters. */
4894 add_params (lang_independent_params, LAST_PARAM);
4896 /* Perform language-specific options initialization. */
4897 (*lang_hooks.init_options) ();
4899 /* Scan to see what optimization level has been specified. That will
4900 determine the default value of many flags. */
4901 for (i = 1; i < argc; i++)
4903 if (!strcmp (argv[i], "-O"))
4908 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4910 /* Handle -Os, -O2, -O3, -O69, ... */
4911 char *p = &argv[i][2];
4913 if ((p[0] == 's') && (p[1] == 0))
4917 /* Optimizing for size forces optimize to be 2. */
4922 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4923 if (optimize_val != -1)
4925 optimize = optimize_val;
4934 flag_merge_constants = 0;
4940 flag_thread_jumps = 1;
4942 flag_delayed_branch = 1;
4944 #ifdef CAN_DEBUG_WITHOUT_FP
4945 flag_omit_frame_pointer = 1;
4947 flag_guess_branch_prob = 1;
4948 flag_cprop_registers = 1;
4949 flag_loop_optimize = 1;
4950 flag_crossjumping = 1;
4951 flag_if_conversion = 1;
4952 flag_if_conversion2 = 1;
4957 flag_optimize_sibling_calls = 1;
4958 flag_cse_follow_jumps = 1;
4959 flag_cse_skip_blocks = 1;
4961 flag_expensive_optimizations = 1;
4962 flag_strength_reduce = 1;
4963 flag_rerun_cse_after_loop = 1;
4964 flag_rerun_loop_opt = 1;
4965 flag_caller_saves = 1;
4968 #ifdef INSN_SCHEDULING
4969 flag_schedule_insns = 1;
4970 flag_schedule_insns_after_reload = 1;
4973 flag_strict_aliasing = 1;
4974 flag_delete_null_pointer_checks = 1;
4975 flag_reorder_blocks = 1;
4976 flag_reorder_functions = 1;
4981 flag_inline_functions = 1;
4982 flag_rename_registers = 1;
4983 flag_unswitch_loops = 1;
4986 if (optimize < 2 || optimize_size)
4991 align_functions = 1;
4993 /* Don't reorder blocks when optimizing for size because extra
4994 jump insns may be created; also barrier may create extra padding.
4996 More correctly we should have a block reordering mode that tried
4997 to minimize the combined size of all the jumps. This would more
4998 or less automatically remove extra jumps, but would also try to
4999 use more short jumps instead of long jumps. */
5000 flag_reorder_blocks = 0;
5003 /* Initialize whether `char' is signed. */
5004 flag_signed_char = DEFAULT_SIGNED_CHAR;
5005 #ifdef DEFAULT_SHORT_ENUMS
5006 /* Initialize how much space enums occupy, by default. */
5007 flag_short_enums = DEFAULT_SHORT_ENUMS;
5010 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5013 set_target_switch ("");
5015 /* Unwind tables are always present in an ABI-conformant IA-64
5016 object file, so the default should be ON. */
5017 #ifdef IA64_UNWIND_INFO
5018 flag_unwind_tables = IA64_UNWIND_INFO;
5021 #ifdef OPTIMIZATION_OPTIONS
5022 /* Allow default optimizations to be specified on a per-machine basis. */
5023 OPTIMIZATION_OPTIONS (optimize, optimize_size);
5026 /* Perform normal command line switch decoding. */
5027 for (i = 1; i < argc;)
5030 int indep_processed;
5032 /* Give the language a chance to decode the option for itself. */
5033 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
5035 if (lang_processed >= 0)
5036 /* Now see if the option also has a language independent meaning.
5037 Some options are both language specific and language independent,
5039 indep_processed = independent_decode_option (argc - i, argv + i);
5042 lang_processed = -lang_processed;
5043 indep_processed = 0;
5046 if (lang_processed || indep_processed)
5047 i += MAX (lang_processed, indep_processed);
5050 const char *option = NULL;
5051 const char *lang = NULL;
5054 /* It is possible that the command line switch is not valid for the
5055 current language, but it is valid for another language. In order
5056 to be compatible with previous versions of the compiler (which
5057 did not issue an error message in this case) we check for this
5058 possibility here. If we do find a match, then if extra_warnings
5059 is set we generate a warning message, otherwise we will just
5060 ignore the option. */
5061 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5063 option = documented_lang_options[j].option;
5066 lang = documented_lang_options[j].description;
5067 else if (! strncmp (argv[i], option, strlen (option)))
5071 if (j != ARRAY_SIZE (documented_lang_options))
5075 warning ("ignoring command line option '%s'", argv[i]);
5078 ("(it is valid for %s but not the selected language)",
5082 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5083 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5085 error ("unrecognized option `%s'", argv[i]);
5091 if (flag_no_inline == 2)
5094 flag_really_no_inline = flag_no_inline;
5096 /* Set flag_no_inline before the post_options () hook. The C front
5097 ends use it to determine tree inlining defaults. FIXME: such
5098 code should be lang-independent when all front ends use tree
5099 inlining, in which case it, and this condition, should be moved
5100 to the top of process_options() instead. */
5103 /* Inlining does not work if not optimizing,
5104 so force it not to be done. */
5108 /* The c_decode_option function and decode_option hook set
5109 this to `2' if -Wall is used, so we can avoid giving out
5110 lots of errors for people who don't realize what -Wall does. */
5111 if (warn_uninitialized == 1)
5112 warning ("-Wuninitialized is not supported without -O");
5115 if (flag_really_no_inline == 2)
5116 flag_really_no_inline = flag_no_inline;
5119 /* Process the options that have been parsed. */
5123 #ifdef OVERRIDE_OPTIONS
5124 /* Some machines may reject certain combinations of options. */
5128 /* Set up the align_*_log variables, defaulting them to 1 if they
5129 were still unset. */
5130 if (align_loops <= 0) align_loops = 1;
5131 if (align_loops_max_skip > align_loops || !align_loops)
5132 align_loops_max_skip = align_loops - 1;
5133 align_loops_log = floor_log2 (align_loops * 2 - 1);
5134 if (align_jumps <= 0) align_jumps = 1;
5135 if (align_jumps_max_skip > align_jumps || !align_jumps)
5136 align_jumps_max_skip = align_jumps - 1;
5137 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5138 if (align_labels <= 0) align_labels = 1;
5139 align_labels_log = floor_log2 (align_labels * 2 - 1);
5140 if (align_labels_max_skip > align_labels || !align_labels)
5141 align_labels_max_skip = align_labels - 1;
5142 if (align_functions <= 0) align_functions = 1;
5143 align_functions_log = floor_log2 (align_functions * 2 - 1);
5145 /* Unrolling all loops implies that standard loop unrolling must also
5147 if (flag_unroll_all_loops)
5148 flag_unroll_loops = 1;
5149 /* Loop unrolling requires that strength_reduction be on also. Silently
5150 turn on strength reduction here if it isn't already on. Also, the loop
5151 unrolling code assumes that cse will be run after loop, so that must
5152 be turned on also. */
5153 if (flag_unroll_loops)
5155 flag_strength_reduce = 1;
5156 flag_rerun_cse_after_loop = 1;
5159 if (flag_non_call_exceptions)
5160 flag_asynchronous_unwind_tables = 1;
5161 if (flag_asynchronous_unwind_tables)
5162 flag_unwind_tables = 1;
5164 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5166 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
5167 flag_unit_at_a_time = 0;
5169 /* Warn about options that are not supported on this machine. */
5170 #ifndef INSN_SCHEDULING
5171 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5172 warning ("instruction scheduling not supported on this target machine");
5175 if (flag_delayed_branch)
5176 warning ("this target machine does not have delayed branches");
5179 user_label_prefix = USER_LABEL_PREFIX;
5180 if (flag_leading_underscore != -1)
5182 /* If the default prefix is more complicated than "" or "_",
5183 issue a warning and ignore this option. */
5184 if (user_label_prefix[0] == 0 ||
5185 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5187 user_label_prefix = flag_leading_underscore ? "_" : "";
5190 warning ("-f%sleading-underscore not supported on this target machine",
5191 flag_leading_underscore ? "" : "no-");
5194 /* If we are in verbose mode, write out the version and maybe all the
5195 option flags in use. */
5198 print_version (stderr, "");
5200 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5206 if (flag_syntax_only)
5208 write_symbols = NO_DEBUG;
5212 /* Now we know write_symbols, set up the debug hooks based on it.
5213 By default we do nothing for debug output. */
5214 #if defined(DBX_DEBUGGING_INFO)
5215 if (write_symbols == DBX_DEBUG)
5216 debug_hooks = &dbx_debug_hooks;
5218 #if defined(XCOFF_DEBUGGING_INFO)
5219 if (write_symbols == XCOFF_DEBUG)
5220 debug_hooks = &xcoff_debug_hooks;
5222 #ifdef SDB_DEBUGGING_INFO
5223 if (write_symbols == SDB_DEBUG)
5224 debug_hooks = &sdb_debug_hooks;
5226 #ifdef DWARF_DEBUGGING_INFO
5227 if (write_symbols == DWARF_DEBUG)
5228 debug_hooks = &dwarf_debug_hooks;
5230 #ifdef DWARF2_DEBUGGING_INFO
5231 if (write_symbols == DWARF2_DEBUG)
5232 debug_hooks = &dwarf2_debug_hooks;
5234 #ifdef VMS_DEBUGGING_INFO
5235 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5236 debug_hooks = &vmsdbg_debug_hooks;
5239 /* If auxiliary info generation is desired, open the output file.
5240 This goes in the same directory as the source file--unlike
5241 all the other output files. */
5242 if (flag_gen_aux_info)
5244 aux_info_file = fopen (aux_info_file_name, "w");
5245 if (aux_info_file == 0)
5246 fatal_io_error ("can't open %s", aux_info_file_name);
5249 if (! targetm.have_named_sections)
5251 if (flag_function_sections)
5253 warning ("-ffunction-sections not supported for this target");
5254 flag_function_sections = 0;
5256 if (flag_data_sections)
5258 warning ("-fdata-sections not supported for this target");
5259 flag_data_sections = 0;
5263 if (flag_function_sections && profile_flag)
5265 warning ("-ffunction-sections disabled; it makes profiling impossible");
5266 flag_function_sections = 0;
5269 #ifndef HAVE_prefetch
5270 if (flag_prefetch_loop_arrays)
5272 warning ("-fprefetch-loop-arrays not supported for this target");
5273 flag_prefetch_loop_arrays = 0;
5276 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5278 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5279 flag_prefetch_loop_arrays = 0;
5283 /* This combination of options isn't handled for i386 targets and doesn't
5284 make much sense anyway, so don't allow it. */
5285 if (flag_prefetch_loop_arrays && optimize_size)
5287 warning ("-fprefetch-loop-arrays is not supported with -Os");
5288 flag_prefetch_loop_arrays = 0;
5291 #ifndef OBJECT_FORMAT_ELF
5292 if (flag_function_sections && write_symbols != NO_DEBUG)
5293 warning ("-ffunction-sections may affect debugging on some targets");
5296 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5297 if (flag_signaling_nans)
5298 flag_trapping_math = 1;
5301 /* Initialize the compiler back end. */
5305 /* init_emit_once uses reg_raw_mode and therefore must be called
5306 after init_regs which initialized reg_raw_mode. */
5308 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5309 || debug_info_level == DINFO_LEVEL_VERBOSE
5310 #ifdef VMS_DEBUGGING_INFO
5311 /* Enable line number info for traceback */
5312 || debug_info_level > DINFO_LEVEL_NONE
5314 || flag_test_coverage
5315 || warn_notreached);
5316 init_fake_stack_mems ();
5320 init_function_once ();
5321 init_varasm_once ();
5323 /* The following initialization functions need to generate rtl, so
5324 provide a dummy function context for them. */
5325 init_dummy_function_start ();
5327 if (flag_caller_saves)
5328 init_caller_save ();
5329 expand_dummy_function_end ();
5332 /* Language-dependent initialization. Returns nonzero on success. */
5334 lang_dependent_init (name)
5337 if (dump_base_name == 0)
5338 dump_base_name = name ? name : "gccdump";
5340 /* Front-end initialization. This hook can assume that GC,
5341 identifier hashes etc. are set up, but debug initialization is
5342 not done yet. This routine must return the original filename
5343 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5344 name = (*lang_hooks.init) (name);
5348 /* Is this duplication necessary? */
5349 name = ggc_strdup (name);
5350 main_input_filename = input_filename = name;
5351 init_asm_output (name);
5353 /* These create various _DECL nodes, so need to be called after the
5354 front end is initialized. */
5358 /* The following initialization functions need to generate rtl, so
5359 provide a dummy function context for them. */
5360 init_dummy_function_start ();
5362 expand_dummy_function_end ();
5364 /* Put an entry on the input file stack for the main input file. */
5365 push_srcloc (input_filename, 0);
5367 /* If dbx symbol table desired, initialize writing it and output the
5368 predefined types. */
5369 timevar_push (TV_SYMOUT);
5371 #ifdef DWARF2_UNWIND_INFO
5372 if (dwarf2out_do_frame ())
5373 dwarf2out_frame_init ();
5376 /* Now we have the correct original filename, we can initialize
5378 (*debug_hooks->init) (name);
5380 timevar_pop (TV_SYMOUT);
5385 /* Clean up: close opened files, etc. */
5390 /* Close the dump files. */
5391 if (flag_gen_aux_info)
5393 fclose (aux_info_file);
5395 unlink (aux_info_file_name);
5398 /* Close non-debugging input and output files. Take special care to note
5399 whether fclose returns an error, since the pages might still be on the
5400 buffer chain while the file is open. */
5404 if (ferror (asm_out_file) != 0)
5405 fatal_io_error ("error writing to %s", asm_file_name);
5406 if (fclose (asm_out_file) != 0)
5407 fatal_io_error ("error closing %s", asm_file_name);
5410 /* Do whatever is necessary to finish printing the graphs. */
5411 if (graph_dump_format != no_graph)
5415 for (i = 0; i < (int) DFI_MAX; ++i)
5416 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5421 sprintf (seq, DUMPFILE_FORMAT, i);
5422 suffix = concat (seq, dump_file[i].extension, NULL);
5423 finish_graph_dump_file (dump_base_name, suffix);
5430 ggc_print_statistics ();
5431 stringpool_statistics ();
5432 dump_tree_statistics ();
5435 /* Free up memory for the benefit of leak detectors. */
5438 /* Language-specific end of compilation actions. */
5439 (*lang_hooks.finish) ();
5442 /* Initialize the compiler, and compile the input file. */
5446 /* All command line options have been parsed; allow the front end to
5447 perform consistency checks, etc. */
5448 bool no_backend = (*lang_hooks.post_options) ();
5450 /* The bulk of command line switch processing. */
5453 /* If an error has already occurred, give up. */
5461 char *name = xstrdup (lbasename (filename));
5463 aux_base_name = name;
5464 strip_off_ending (name, strlen (name));
5467 aux_base_name = "gccaux";
5469 /* We cannot start timing until after options are processed since that
5470 says if we run timers or not. */
5472 timevar_start (TV_TOTAL);
5474 /* Set up the back-end if requested. */
5478 /* Language-dependent initialization. Returns true on success. */
5479 if (lang_dependent_init (filename))
5484 /* Stop timing and print the times. */
5485 timevar_stop (TV_TOTAL);
5486 timevar_print (stderr);
5489 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5490 Decode command args, then call compile_file.
5491 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5492 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5494 It is not safe to call this function more than once. */
5497 toplev_main (argc, argv)
5501 /* Initialization of GCC's environment, and diagnostics. */
5502 general_init (argv[0]);
5504 /* Parse the options and do minimal processing; basically just
5505 enough to default flags appropriately. */
5506 parse_options_and_default_flags (argc, argv);
5508 /* Exit early if we can (e.g. -help). */
5509 if (!exit_after_options)
5512 if (errorcount || sorrycount)
5513 return (FATAL_EXIT_CODE);
5515 return (SUCCESS_EXIT_CODE);