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. */
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
46 #include "insn-attr.h"
47 #include "insn-config.h"
48 #include "insn-flags.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
72 #include "langhooks.h"
73 #include "cfglayout.h"
75 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
76 #include "dwarf2out.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
83 #ifdef SDB_DEBUGGING_INFO
87 #ifdef XCOFF_DEBUGGING_INFO
88 #include "xcoffout.h" /* Needed for external data
89 declarations for e.g. AIX 4.x. */
92 /* Carry information from ASM_DECLARE_OBJECT_NAME
93 to ASM_FINISH_DECLARE_OBJECT. */
95 extern int size_directive_output;
96 extern tree last_assemble_variable_decl;
98 extern void reg_alloc PARAMS ((void));
100 static void general_init PARAMS ((char *));
101 static void parse_options_and_default_flags PARAMS ((int, char **));
102 static void do_compile PARAMS ((void));
103 static void process_options PARAMS ((void));
104 static void backend_init PARAMS ((void));
105 static int lang_dependent_init PARAMS ((const char *));
106 static void init_asm_output PARAMS ((const char *));
107 static void finalize PARAMS ((void));
109 static void set_target_switch PARAMS ((const char *));
111 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
112 static void compile_file PARAMS ((void));
113 static void display_help PARAMS ((void));
114 static void display_target_options PARAMS ((void));
116 static void decode_d_option PARAMS ((const char *));
117 static int decode_f_option PARAMS ((const char *));
118 static int decode_W_option PARAMS ((const char *));
119 static int decode_g_option PARAMS ((const char *));
120 static unsigned int independent_decode_option PARAMS ((int, char **));
122 static void print_version PARAMS ((FILE *, const char *));
123 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
124 const char *, const char *,
125 const char *, const char *));
126 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
127 const char *, const char *));
129 /* Nonzero to dump debug info whilst parsing (-dy option). */
130 static int set_yydebug;
132 /* Length of line when printing switch values. */
135 /* Name of program invoked, sans directories. */
137 const char *progname;
139 /* Copy of arguments to toplev_main. */
143 /* Name of current original source file (what was input to cpp).
144 This comes from each #-command in the actual input. */
146 const char *input_filename;
148 /* Name of top-level original source file (what was input to cpp).
149 This comes from the #-command at the beginning of the actual input.
150 If there isn't any there, then this is the cc1 input file name. */
152 const char *main_input_filename;
154 /* Current line number in real source file. */
158 /* Nonzero if it is unsafe to create any new pseudo registers. */
161 /* Stack of currently pending input files. */
163 struct file_stack *input_file_stack;
165 /* Incremented on each change to input_file_stack. */
166 int input_file_stack_tick;
168 /* Name to use as base of names for dump output files. */
170 const char *dump_base_name;
172 /* Name to use as a base for auxiliary output files. */
174 const char *aux_base_name;
176 /* Format to use to print dumpfile index value */
177 #ifndef DUMPFILE_FORMAT
178 #define DUMPFILE_FORMAT ".%02d."
181 /* Bit flags that specify the machine subtype we are compiling for.
182 Bits are tested using macros TARGET_... defined in the tm.h file
183 and set by `-m...' switches. Must be defined in rtlanal.c. */
185 extern int target_flags;
187 /* A mask of target_flags that includes bit X if X was set or cleared
188 on the command line. */
190 int target_flags_explicit;
192 /* Debug hooks - dependent upon command line options. */
194 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
196 /* Describes a dump file. */
198 struct dump_file_info
200 /* The unique extension to apply, e.g. ".jump". */
201 const char *const extension;
203 /* The -d<c> character that enables this dump file. */
204 char const debug_switch;
206 /* True if there is a corresponding graph dump file. */
207 char const graph_dump_p;
209 /* True if the user selected this dump. */
212 /* True if the files have been initialized (ie truncated). */
216 /* Enumerate the extant dump files. */
258 /* Describes all the dump files. Should be kept in order of the
259 pass and in sync with dump_file_index above.
261 Remaining -d letters:
267 static struct dump_file_info dump_file[DFI_MAX] =
269 { "rtl", 'r', 0, 0, 0 },
270 { "sibling", 'i', 0, 0, 0 },
271 { "eh", 'h', 0, 0, 0 },
272 { "jump", 'j', 0, 0, 0 },
273 { "ssa", 'e', 1, 0, 0 },
274 { "ssaccp", 'W', 1, 0, 0 },
275 { "ssadce", 'X', 1, 0, 0 },
276 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
277 { "null", 'u', 0, 0, 0 },
278 { "cse", 's', 0, 0, 0 },
279 { "addressof", 'F', 0, 0, 0 },
280 { "gcse", 'G', 1, 0, 0 },
281 { "loop", 'L', 1, 0, 0 },
282 { "cfg", 'f', 1, 0, 0 },
283 { "bp", 'b', 1, 0, 0 },
284 { "ce1", 'C', 1, 0, 0 },
285 { "tracer", 'T', 1, 0, 0 },
286 { "cse2", 't', 1, 0, 0 },
287 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
288 { "combine", 'c', 1, 0, 0 },
289 { "ce2", 'C', 1, 0, 0 },
290 { "regmove", 'N', 1, 0, 0 },
291 { "sched", 'S', 1, 0, 0 },
292 { "lreg", 'l', 1, 0, 0 },
293 { "greg", 'g', 1, 0, 0 },
294 { "postreload", 'o', 1, 0, 0 },
295 { "flow2", 'w', 1, 0, 0 },
296 { "peephole2", 'z', 1, 0, 0 },
297 { "rnreg", 'n', 1, 0, 0 },
298 { "ce3", 'E', 1, 0, 0 },
299 { "sched2", 'R', 1, 0, 0 },
300 { "stack", 'k', 1, 0, 0 },
301 { "bbro", 'B', 1, 0, 0 },
302 { "mach", 'M', 1, 0, 0 },
303 { "dbr", 'd', 0, 0, 0 },
306 static int open_dump_file PARAMS ((enum dump_file_index, tree));
307 static void close_dump_file PARAMS ((enum dump_file_index,
308 void (*) (FILE *, rtx), rtx));
310 /* Other flags saying which kinds of debugging dump have been requested. */
312 int rtl_dump_and_exit;
313 int flag_print_asm_name;
314 static int version_flag;
315 static char *filename;
316 enum graph_dump_types graph_dump_format;
318 /* Name for output file of assembly code, specified with -o. */
322 /* Value of the -G xx switch, and whether it was passed or not. */
326 /* Type(s) of debugging information we are producing (if any).
327 See flags.h for the definitions of the different possible
328 types of debugging information. */
329 enum debug_info_type write_symbols = NO_DEBUG;
331 /* Level of debugging information we are producing. See flags.h
332 for the definitions of the different possible levels. */
333 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
335 /* Nonzero means use GNU-only extensions in the generated symbolic
336 debugging information. */
337 /* Currently, this only has an effect when write_symbols is set to
338 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
339 int use_gnu_debug_info_extensions = 0;
341 /* Nonzero means do optimizations. -O.
342 Particular numeric values stand for particular amounts of optimization;
343 thus, -O2 stores 2 here. However, the optimizations beyond the basic
344 ones are not controlled directly by this variable. Instead, they are
345 controlled by individual `flag_...' variables that are defaulted
346 based on this variable. */
350 /* Nonzero means optimize for size. -Os.
351 The only valid values are zero and nonzero. When optimize_size is
352 nonzero, optimize defaults to 2, but certain individual code
353 bloating optimizations are disabled. */
355 int optimize_size = 0;
357 /* Nonzero if we should exit after parsing options. */
358 static int exit_after_options = 0;
360 /* The FUNCTION_DECL for the function currently being compiled,
361 or 0 if between functions. */
362 tree current_function_decl;
364 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
366 tree current_function_func_begin_label;
368 /* Nonzero if doing dwarf2 duplicate elimination. */
370 int flag_eliminate_dwarf2_dups = 0;
372 /* Nonzero if generating code to do profiling. */
374 int profile_flag = 0;
376 /* Nonzero if generating code to profile program flow graph arcs. */
378 int profile_arc_flag = 0;
380 /* Nonzero if generating info for gcov to calculate line test coverage. */
382 int flag_test_coverage = 0;
384 /* Nonzero indicates that branch taken probabilities should be calculated. */
386 int flag_branch_probabilities = 0;
388 /* Nonzero if basic blocks should be reordered. */
390 int flag_reorder_blocks = 0;
392 /* Nonzero if functions should be reordered. */
394 int flag_reorder_functions = 0;
396 /* Nonzero if registers should be renamed. */
398 int flag_rename_registers = 0;
399 int flag_cprop_registers = 0;
401 /* Nonzero for -pedantic switch: warn about anything
402 that standard spec forbids. */
406 /* Temporarily suppress certain warnings.
407 This is set while reading code from a system header file. */
409 int in_system_header = 0;
411 /* Don't print functions as they are compiled. -quiet. */
415 /* Print times taken by the various passes. -ftime-report. */
419 /* Print memory still in use at end of compilation (which may have little
420 to do with peak memory consumption). -fmem-report. */
424 /* Non-zero means to collect statistics which might be expensive
425 and to print them when we are done. */
426 int flag_detailed_statistics = 0;
431 /* Nonzero means `char' should be signed. */
433 int flag_signed_char;
435 /* Nonzero means give an enum type only as many bytes as it needs. */
437 int flag_short_enums;
439 /* Nonzero for -fcaller-saves: allocate values in regs that need to
440 be saved across function calls, if that produces overall better code.
441 Optional now, so people can test it. */
443 #ifdef DEFAULT_CALLER_SAVES
444 int flag_caller_saves = 1;
446 int flag_caller_saves = 0;
449 /* Nonzero if structures and unions should be returned in memory.
451 This should only be defined if compatibility with another compiler or
452 with an ABI is needed, because it results in slower code. */
454 #ifndef DEFAULT_PCC_STRUCT_RETURN
455 #define DEFAULT_PCC_STRUCT_RETURN 1
458 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
460 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
462 /* Nonzero for -fforce-mem: load memory value into a register
463 before arithmetic on it. This makes better cse but slower compilation. */
465 int flag_force_mem = 0;
467 /* Nonzero for -fforce-addr: load memory address into a register before
468 reference to memory. This makes better cse but slower compilation. */
470 int flag_force_addr = 0;
472 /* Nonzero for -fdefer-pop: don't pop args after each function call;
473 instead save them up to pop many calls' args with one insns. */
475 int flag_defer_pop = 0;
477 /* Nonzero for -ffloat-store: don't allocate floats and doubles
478 in extended-precision registers. */
480 int flag_float_store = 0;
482 /* Nonzero for -fcse-follow-jumps:
483 have cse follow jumps to do a more extensive job. */
485 int flag_cse_follow_jumps;
487 /* Nonzero for -fcse-skip-blocks:
488 have cse follow a branch around a block. */
489 int flag_cse_skip_blocks;
491 /* Nonzero for -fexpensive-optimizations:
492 perform miscellaneous relatively-expensive optimizations. */
493 int flag_expensive_optimizations;
495 /* Nonzero for -fthread-jumps:
496 have jump optimize output of loop. */
498 int flag_thread_jumps;
500 /* Nonzero enables strength-reduction in loop.c. */
502 int flag_strength_reduce = 0;
504 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
505 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
506 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
509 int flag_unroll_loops;
511 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
512 This is generally not a win. */
514 int flag_unroll_all_loops;
516 /* Nonzero enables prefetch optimizations for arrays in loops. */
518 int flag_prefetch_loop_arrays;
520 /* Nonzero forces all invariant computations in loops to be moved
523 int flag_move_all_movables = 0;
525 /* Nonzero forces all general induction variables in loops to be
528 int flag_reduce_all_givs = 0;
530 /* Nonzero to perform full register move optimization passes. This is the
533 int flag_regmove = 0;
535 /* Nonzero for -fwritable-strings:
536 store string constants in data segment and don't uniquize them. */
538 int flag_writable_strings = 0;
540 /* Nonzero means don't put addresses of constant functions in registers.
541 Used for compiling the Unix kernel, where strange substitutions are
542 done on the assembly output. */
544 int flag_no_function_cse = 0;
546 /* Nonzero for -fomit-frame-pointer:
547 don't make a frame pointer in simple functions that don't require one. */
549 int flag_omit_frame_pointer = 0;
551 /* Nonzero means place each function into its own section on those platforms
552 which support arbitrary section names and unlimited numbers of sections. */
554 int flag_function_sections = 0;
556 /* ... and similar for data. */
558 int flag_data_sections = 0;
560 /* Nonzero to inhibit use of define_optimization peephole opts. */
562 int flag_no_peephole = 0;
564 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
566 int flag_optimize_sibling_calls = 0;
568 /* Nonzero means the front end generally wants `errno' maintained by math
569 operations, like built-in SQRT. */
571 int flag_errno_math = 1;
573 /* Nonzero means that unsafe floating-point math optimizations are allowed
574 for the sake of speed. IEEE compliance is not guaranteed, and operations
575 are allowed to assume that their arguments and results are "normal"
576 (e.g., nonnegative for SQRT). */
578 int flag_unsafe_math_optimizations = 0;
580 /* Nonzero means that no NaNs or +-Infs are expected. */
582 int flag_finite_math_only = 0;
584 /* Zero means that floating-point math operations cannot generate a
585 (user-visible) trap. This is the case, for example, in nonstop
586 IEEE 754 arithmetic. Trapping conditions include division by zero,
587 overflow, underflow, invalid and inexact, but does not include
588 operations on signaling NaNs (see below). */
590 int flag_trapping_math = 1;
592 /* Nonzero means disable transformations observable by signaling NaNs.
593 This option implies that any operation on a IEEE signaling NaN can
594 generate a (user-visible) trap. */
596 int flag_signaling_nans = 0;
598 /* 0 means straightforward implementation of complex divide acceptable.
599 1 means wide ranges of inputs must work for complex divide.
600 2 means C99-like requirements for complex divide (not yet implemented). */
602 int flag_complex_divide_method = 0;
604 /* Nonzero means all references through pointers are volatile. */
608 /* Nonzero means treat all global and extern variables as volatile. */
610 int flag_volatile_global;
612 /* Nonzero means treat all static variables as volatile. */
614 int flag_volatile_static;
616 /* Nonzero means just do syntax checking; don't output anything. */
618 int flag_syntax_only = 0;
620 /* Nonzero means perform global cse. */
622 static int flag_gcse;
624 /* Nonzero means perform loop optimizer. */
626 static int flag_loop_optimize;
628 /* Nonzero means perform crossjumping. */
630 static int flag_crossjumping;
632 /* Nonzero means perform if conversion. */
634 static int flag_if_conversion;
636 /* Nonzero means perform if conversion after reload. */
638 static int flag_if_conversion2;
640 /* Nonzero means to use global dataflow analysis to eliminate
641 useless null pointer tests. */
643 static int flag_delete_null_pointer_checks;
645 /* Nonzero means to do the enhanced load motion during gcse, which trys
646 to hoist loads by not killing them when a store to the same location
649 int flag_gcse_lm = 1;
651 /* Nonzero means to perform store motion after gcse, which will try to
652 move stores closer to the exit block. Its not very effective without
655 int flag_gcse_sm = 1;
657 /* Nonzero means to rerun cse after loop optimization. This increases
658 compilation time about 20% and picks up a few more common expressions. */
660 static int flag_rerun_cse_after_loop;
662 /* Nonzero means to run loop optimizations twice. */
664 int flag_rerun_loop_opt;
666 /* Nonzero for -finline-functions: ok to inline functions that look like
667 good inline candidates. */
669 int flag_inline_functions;
671 /* Nonzero for -fkeep-inline-functions: even if we make a function
672 go inline everywhere, keep its definition around for debugging
675 int flag_keep_inline_functions;
677 /* Nonzero means that functions will not be inlined. */
679 int flag_no_inline = 2;
681 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
682 not just because the tree inliner turned us off. */
684 int flag_really_no_inline = 2;
686 /* Nonzero means that we should emit static const variables
687 regardless of whether or not optimization is turned on. */
689 int flag_keep_static_consts = 1;
691 /* Nonzero means we should be saving declaration info into a .X file. */
693 int flag_gen_aux_info = 0;
695 /* Specified name of aux-info file. */
697 static char *aux_info_file_name;
699 /* Nonzero means make the text shared if supported. */
701 int flag_shared_data;
703 /* Nonzero means schedule into delayed branch slots if supported. */
705 int flag_delayed_branch;
707 /* Nonzero if we are compiling pure (sharable) code.
708 Value is 1 if we are doing "small" pic; value is 2 if we're doing
713 /* Set to the default thread-local storage (tls) model to use. */
715 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
717 /* Nonzero means generate extra code for exception handling and enable
718 exception handling. */
722 /* Nonzero means generate frame unwind info table when supported. */
724 int flag_unwind_tables = 0;
726 /* Nonzero means generate frame unwind info table exact at each insn boundary */
728 int flag_asynchronous_unwind_tables = 0;
730 /* Nonzero means don't place uninitialized global data in common storage
735 /* Nonzero means change certain warnings into errors.
736 Usually these are warnings about failure to conform to some standard. */
738 int flag_pedantic_errors = 0;
740 /* flag_schedule_insns means schedule insns within basic blocks (before
742 flag_schedule_insns_after_reload means schedule insns after
745 int flag_schedule_insns = 0;
746 int flag_schedule_insns_after_reload = 0;
748 /* The following flags have effect only for scheduling before register
751 flag_schedule_interblock means schedule insns accross basic blocks.
752 flag_schedule_speculative means allow speculative motion of non-load insns.
753 flag_schedule_speculative_load means allow speculative motion of some
755 flag_schedule_speculative_load_dangerous allows speculative motion of more
758 int flag_schedule_interblock = 1;
759 int flag_schedule_speculative = 1;
760 int flag_schedule_speculative_load = 0;
761 int flag_schedule_speculative_load_dangerous = 0;
763 int flag_single_precision_constant;
765 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
766 by a cheaper branch on a count register. */
767 int flag_branch_on_count_reg = 1;
769 /* -finhibit-size-directive inhibits output of .size for ELF.
770 This is used only for compiling crtstuff.c,
771 and it may be extended to other effects
772 needed for crtstuff.c on other systems. */
773 int flag_inhibit_size_directive = 0;
775 /* -fverbose-asm causes extra commentary information to be produced in
776 the generated assembly code (to make it more readable). This option
777 is generally only of use to those who actually need to read the
778 generated assembly code (perhaps while debugging the compiler itself).
779 -fno-verbose-asm, the default, causes the extra information
780 to be omitted and is useful when comparing two assembler files. */
782 int flag_verbose_asm = 0;
784 /* -dA causes debug commentary information to be produced in
785 the generated assembly code (to make it more readable). This option
786 is generally only of use to those who actually need to read the
787 generated assembly code (perhaps while debugging the compiler itself).
788 Currently, this switch is only used by dwarfout.c; however, it is intended
789 to be a catchall for printing debug information in the assembler file. */
791 int flag_debug_asm = 0;
793 /* -dP causes the rtl to be emitted as a comment in assembly. */
795 int flag_dump_rtl_in_asm = 0;
797 /* -fgnu-linker specifies use of the GNU linker for initializations.
798 (Or, more generally, a linker that handles initializations.)
799 -fno-gnu-linker says that collect2 will be used. */
801 int flag_gnu_linker = 0;
803 int flag_gnu_linker = 1;
806 /* Nonzero means put zero initialized data in the bss section. */
807 int flag_zero_initialized_in_bss = 1;
812 /* Enable ssa conditional constant propagation. */
813 int flag_ssa_ccp = 0;
815 /* Enable ssa aggressive dead code elimination. */
816 int flag_ssa_dce = 0;
818 /* Tag all structures with __attribute__(packed). */
819 int flag_pack_struct = 0;
821 /* Emit code to check for stack overflow; also may cause large objects
822 to be allocated dynamically. */
823 int flag_stack_check;
825 /* When non-NULL, indicates that whenever space is allocated on the
826 stack, the resulting stack pointer must not pass this
827 address---that is, for stacks that grow downward, the stack pointer
828 must always be greater than or equal to this address; for stacks
829 that grow upward, the stack pointer must be less than this address.
830 At present, the rtx may be either a REG or a SYMBOL_REF, although
831 the support provided depends on the backend. */
834 /* 0 if pointer arguments may alias each other. True in C.
835 1 if pointer arguments may not alias each other but may alias
837 2 if pointer arguments may not alias each other and may not
838 alias global variables. True in Fortran.
839 This defaults to 0 for C. */
840 int flag_argument_noalias = 0;
842 /* Nonzero if we should do (language-dependent) alias analysis.
843 Typically, this analysis will assume that expressions of certain
844 types do not alias expressions of certain other types. Only used
845 if alias analysis (in general) is enabled. */
846 int flag_strict_aliasing = 0;
848 /* Instrument functions with calls at entry and exit, for profiling. */
849 int flag_instrument_function_entry_exit = 0;
851 /* Nonzero means ignore `#ident' directives. 0 means handle them.
852 On SVR4 targets, it also controls whether or not to emit a
853 string identifying the compiler. */
855 int flag_no_ident = 0;
857 /* This will perform a peephole pass before sched2. */
858 int flag_peephole2 = 0;
860 /* This will try to guess branch probabilities. */
861 int flag_guess_branch_prob = 0;
863 /* -fcheck-bounds causes gcc to generate array bounds checks.
864 For C, C++, ObjC: defaults to off.
865 For Java: defaults to on.
866 For Fortran: defaults to off. */
867 int flag_bounds_check = 0;
869 /* This will attempt to merge constant section constants, if 1 only
870 string constants and constants from constant pool, if 2 also constant
872 int flag_merge_constants = 1;
874 /* If one, renumber instruction UIDs to reduce the number of
875 unused UIDs if there are a lot of instructions. If greater than
876 one, unconditionally renumber instruction UIDs. */
877 int flag_renumber_insns = 1;
879 /* If nonzero, use the graph coloring register allocator. */
880 int flag_new_regalloc = 0;
882 /* Nonzero if we perform superblock formation. */
886 /* Values of the -falign-* flags: how much to align labels in code.
887 0 means `use default', 1 means `don't align'.
888 For each variable, there is an _log variant which is the power
889 of two not less than the variable, for .align output. */
893 int align_loops_max_skip;
896 int align_jumps_max_skip;
898 int align_labels_log;
899 int align_labels_max_skip;
901 int align_functions_log;
903 /* Like align_functions_log above, but used by front-ends to force the
904 minimum function alignment. Zero means no alignment is forced. */
905 int force_align_functions_log;
907 /* Table of supported debugging formats. */
910 const char *const arg;
911 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
912 constant expression, we use NO_DEBUG in its place. */
913 const enum debug_info_type debug_type;
914 const int use_extensions_p;
915 const char *const description;
919 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
920 N_("Generate debugging info in default format") },
921 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
922 #ifdef DBX_DEBUGGING_INFO
923 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
924 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
926 #ifdef DWARF_DEBUGGING_INFO
927 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
928 { "dwarf+", DWARF_DEBUG, 1,
929 N_("Generate extended DWARF-1 format debug info") },
931 #ifdef DWARF2_DEBUGGING_INFO
932 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
934 #ifdef XCOFF_DEBUGGING_INFO
935 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
936 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
938 #ifdef SDB_DEBUGGING_INFO
939 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
941 #ifdef VMS_DEBUGGING_INFO
942 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
949 const char *const string;
952 const char *const description;
954 lang_independent_options;
958 /* Add or remove a leading underscore from user symbols. */
959 int flag_leading_underscore = -1;
961 /* The user symbol prefix after having resolved same. */
962 const char *user_label_prefix;
964 static const param_info lang_independent_params[] = {
965 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
966 { OPTION, DEFAULT, HELP },
967 #include "params.def"
972 /* Table of language-independent -f options.
973 STRING is the option name. VARIABLE is the address of the variable.
974 ON_VALUE is the value to store in VARIABLE
975 if `-fSTRING' is seen as an option.
976 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
978 static const lang_independent_options f_options[] =
980 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
981 N_("Perform DWARF2 duplicate elimination") },
982 {"float-store", &flag_float_store, 1,
983 N_("Do not store floats in registers") },
984 {"volatile", &flag_volatile, 1,
985 N_("Consider all mem refs through pointers as volatile") },
986 {"volatile-global", &flag_volatile_global, 1,
987 N_("Consider all mem refs to global data to be volatile") },
988 {"volatile-static", &flag_volatile_static, 1,
989 N_("Consider all mem refs to static data to be volatile") },
990 {"defer-pop", &flag_defer_pop, 1,
991 N_("Defer popping functions args from stack until later") },
992 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
993 N_("When possible do not generate stack frames") },
994 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
995 N_("Optimize sibling and tail recursive calls") },
996 {"tracer", &flag_tracer, 1,
997 N_("Perform superblock formation via tail duplication") },
998 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
999 N_("When running CSE, follow jumps to their targets") },
1000 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1001 N_("When running CSE, follow conditional jumps") },
1002 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1003 N_("Perform a number of minor, expensive optimizations") },
1004 {"thread-jumps", &flag_thread_jumps, 1,
1005 N_("Perform jump threading optimizations") },
1006 {"strength-reduce", &flag_strength_reduce, 1,
1007 N_("Perform strength reduction optimizations") },
1008 {"unroll-loops", &flag_unroll_loops, 1,
1009 N_("Perform loop unrolling when iteration count is known") },
1010 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1011 N_("Perform loop unrolling for all loops") },
1012 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1013 N_("Generate prefetch instructions, if available, for arrays in loops") },
1014 {"move-all-movables", &flag_move_all_movables, 1,
1015 N_("Force all loop invariant computations out of loops") },
1016 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1017 N_("Strength reduce all loop general induction variables") },
1018 {"writable-strings", &flag_writable_strings, 1,
1019 N_("Store strings in writable data section") },
1020 {"peephole", &flag_no_peephole, 0,
1021 N_("Enable machine specific peephole optimizations") },
1022 {"force-mem", &flag_force_mem, 1,
1023 N_("Copy memory operands into registers before using") },
1024 {"force-addr", &flag_force_addr, 1,
1025 N_("Copy memory address constants into regs before using") },
1026 {"function-cse", &flag_no_function_cse, 0,
1027 N_("Allow function addresses to be held in registers") },
1028 {"inline-functions", &flag_inline_functions, 1,
1029 N_("Integrate simple functions into their callers") },
1030 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1031 N_("Generate code for funcs even if they are fully inlined") },
1032 {"inline", &flag_no_inline, 0,
1033 N_("Pay attention to the 'inline' keyword") },
1034 {"keep-static-consts", &flag_keep_static_consts, 1,
1035 N_("Emit static const variables even if they are not used") },
1036 {"syntax-only", &flag_syntax_only, 1,
1037 N_("Check for syntax errors, then stop") },
1038 {"shared-data", &flag_shared_data, 1,
1039 N_("Mark data as shared rather than private") },
1040 {"caller-saves", &flag_caller_saves, 1,
1041 N_("Enable saving registers around function calls") },
1042 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1043 N_("Return 'short' aggregates in memory, not registers") },
1044 {"reg-struct-return", &flag_pcc_struct_return, 0,
1045 N_("Return 'short' aggregates in registers") },
1046 {"delayed-branch", &flag_delayed_branch, 1,
1047 N_("Attempt to fill delay slots of branch instructions") },
1048 {"gcse", &flag_gcse, 1,
1049 N_("Perform the global common subexpression elimination") },
1050 {"gcse-lm", &flag_gcse_lm, 1,
1051 N_("Perform enhanced load motion during global subexpression elimination") },
1052 {"gcse-sm", &flag_gcse_sm, 1,
1053 N_("Perform store motion after global subexpression elimination") },
1054 {"loop-optimize", &flag_loop_optimize, 1,
1055 N_("Perform the loop optimizations") },
1056 {"crossjumping", &flag_crossjumping, 1,
1057 N_("Perform cross-jumping optimization") },
1058 {"if-conversion", &flag_if_conversion, 1,
1059 N_("Perform conversion of conditional jumps to branchless equivalents") },
1060 {"if-conversion2", &flag_if_conversion2, 1,
1061 N_("Perform conversion of conditional jumps to conditional execution") },
1062 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1063 N_("Run CSE pass after loop optimizations") },
1064 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1065 N_("Run the loop optimizer twice") },
1066 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1067 N_("Delete useless null pointer checks") },
1068 {"schedule-insns", &flag_schedule_insns, 1,
1069 N_("Reschedule instructions before register allocation") },
1070 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1071 N_("Reschedule instructions after register allocation") },
1072 {"sched-interblock",&flag_schedule_interblock, 1,
1073 N_("Enable scheduling across basic blocks") },
1074 {"sched-spec",&flag_schedule_speculative, 1,
1075 N_("Allow speculative motion of non-loads") },
1076 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1077 N_("Allow speculative motion of some loads") },
1078 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1079 N_("Allow speculative motion of more loads") },
1080 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1081 N_("Replace add,compare,branch with branch on count reg") },
1082 {"pic", &flag_pic, 1,
1083 N_("Generate position independent code, if possible") },
1084 {"PIC", &flag_pic, 2, ""},
1085 {"exceptions", &flag_exceptions, 1,
1086 N_("Enable exception handling") },
1087 {"unwind-tables", &flag_unwind_tables, 1,
1088 N_("Just generate unwind tables for exception handling") },
1089 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1090 N_("Generate unwind tables exact at each instruction boundary") },
1091 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1092 N_("Support synchronous non-call exceptions") },
1093 {"profile-arcs", &profile_arc_flag, 1,
1094 N_("Insert arc based program profiling code") },
1095 {"test-coverage", &flag_test_coverage, 1,
1096 N_("Create data files needed by gcov") },
1097 {"branch-probabilities", &flag_branch_probabilities, 1,
1098 N_("Use profiling information for branch probabilities") },
1099 {"profile", &profile_flag, 1,
1100 N_("Enable basic program profiling code") },
1101 {"reorder-blocks", &flag_reorder_blocks, 1,
1102 N_("Reorder basic blocks to improve code placement") },
1103 {"reorder-functions", &flag_reorder_functions, 1,
1104 N_("Reorder functions to improve code placement") },
1105 {"rename-registers", &flag_rename_registers, 1,
1106 N_("Do the register renaming optimization pass") },
1107 {"cprop-registers", &flag_cprop_registers, 1,
1108 N_("Do the register copy-propagation optimization pass") },
1109 {"common", &flag_no_common, 0,
1110 N_("Do not put uninitialized globals in the common section") },
1111 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1112 N_("Do not generate .size directives") },
1113 {"function-sections", &flag_function_sections, 1,
1114 N_("place each function into its own section") },
1115 {"data-sections", &flag_data_sections, 1,
1116 N_("place data items into their own section") },
1117 {"verbose-asm", &flag_verbose_asm, 1,
1118 N_("Add extra commentary to assembler output") },
1119 {"gnu-linker", &flag_gnu_linker, 1,
1120 N_("Output GNU ld formatted global initializers") },
1121 {"regmove", &flag_regmove, 1,
1122 N_("Enables a register move optimization") },
1123 {"optimize-register-move", &flag_regmove, 1,
1124 N_("Do the full regmove optimization pass") },
1125 {"pack-struct", &flag_pack_struct, 1,
1126 N_("Pack structure members together without holes") },
1127 {"stack-check", &flag_stack_check, 1,
1128 N_("Insert stack checking code into the program") },
1129 {"argument-alias", &flag_argument_noalias, 0,
1130 N_("Specify that arguments may alias each other & globals") },
1131 {"argument-noalias", &flag_argument_noalias, 1,
1132 N_("Assume arguments may alias globals but not each other") },
1133 {"argument-noalias-global", &flag_argument_noalias, 2,
1134 N_("Assume arguments do not alias each other or globals") },
1135 {"strict-aliasing", &flag_strict_aliasing, 1,
1136 N_("Assume strict aliasing rules apply") },
1137 {"align-loops", &align_loops, 0,
1138 N_("Align the start of loops") },
1139 {"align-jumps", &align_jumps, 0,
1140 N_("Align labels which are only reached by jumping") },
1141 {"align-labels", &align_labels, 0,
1142 N_("Align all labels") },
1143 {"align-functions", &align_functions, 0,
1144 N_("Align the start of functions") },
1145 {"merge-constants", &flag_merge_constants, 1,
1146 N_("Attempt to merge identical constants across compilation units") },
1147 {"merge-all-constants", &flag_merge_constants, 2,
1148 N_("Attempt to merge identical constants and constant variables") },
1149 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1150 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1151 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1152 N_("Instrument function entry/exit with profiling calls") },
1153 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1154 N_("Put zero initialized data in the bss section") },
1155 {"ssa", &flag_ssa, 1,
1156 N_("Enable SSA optimizations") },
1157 {"ssa-ccp", &flag_ssa_ccp, 1,
1158 N_("Enable SSA conditional constant propagation") },
1159 {"ssa-dce", &flag_ssa_dce, 1,
1160 N_("Enable aggressive SSA dead code elimination") },
1161 {"leading-underscore", &flag_leading_underscore, 1,
1162 N_("External symbols have a leading underscore") },
1163 {"ident", &flag_no_ident, 0,
1164 N_("Process #ident directives") },
1165 { "peephole2", &flag_peephole2, 1,
1166 N_("Enables an rtl peephole pass run before sched2") },
1167 {"finite-math-only", &flag_finite_math_only, 1,
1168 N_("Assume no NaNs or +-Infs are generated") },
1169 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1170 N_("Enables guessing of branch probabilities") },
1171 {"math-errno", &flag_errno_math, 1,
1172 N_("Set errno after built-in math functions") },
1173 {"trapping-math", &flag_trapping_math, 1,
1174 N_("Floating-point operations can trap") },
1175 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1176 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1177 {"signaling-nans", &flag_signaling_nans, 1,
1178 N_("Disable optimizations observable by IEEE signaling NaNs") },
1179 {"bounds-check", &flag_bounds_check, 1,
1180 N_("Generate code to check bounds before indexing arrays") },
1181 {"single-precision-constant", &flag_single_precision_constant, 1,
1182 N_("Convert floating point constant to single precision constant") },
1183 {"time-report", &time_report, 1,
1184 N_("Report time taken by each compiler pass at end of run") },
1185 {"mem-report", &mem_report, 1,
1186 N_("Report on permanent memory allocation at end of run") },
1187 { "trapv", &flag_trapv, 1,
1188 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1189 { "new-ra", &flag_new_regalloc, 1,
1190 N_("Use graph coloring register allocation.") },
1193 /* Table of language-specific options. */
1195 static const struct lang_opt
1197 const char *const option;
1198 const char *const description;
1200 documented_lang_options[] =
1202 /* In order not to overload the --help output, the convention
1203 used here is to only describe those options which are not
1204 enabled by default. */
1207 N_("Compile just for ISO C90") },
1209 N_("Determine language standard") },
1211 { "-fsigned-bitfields", "" },
1212 { "-funsigned-bitfields",
1213 N_("Make bit-fields by unsigned by default") },
1214 { "-fno-signed-bitfields", "" },
1215 { "-fno-unsigned-bitfields","" },
1217 N_("Make 'char' be signed by default") },
1218 { "-funsigned-char",
1219 N_("Make 'char' be unsigned by default") },
1220 { "-fno-signed-char", "" },
1221 { "-fno-unsigned-char", "" },
1225 N_("Do not recognize the 'asm' keyword") },
1226 { "-fbuiltin", "" },
1228 N_("Do not recognize any built in functions") },
1230 N_("Assume normal C execution environment") },
1231 { "-fno-hosted", "" },
1233 N_("Assume that standard libraries & main might not exist") },
1234 { "-fno-freestanding", "" },
1235 { "-fcond-mismatch",
1236 N_("Allow different types as args of ? operator") },
1237 { "-fno-cond-mismatch", "" },
1238 { "-fdollars-in-identifiers",
1239 N_("Allow the use of $ inside identifiers") },
1240 { "-fno-dollars-in-identifiers", "" },
1241 { "-fpreprocessed", "" },
1242 { "-fno-preprocessed", "" },
1244 N_("Use the same size for double as for float") },
1245 { "-fno-short-double", "" },
1247 N_("Use the smallest fitting integer to hold enums") },
1248 { "-fno-short-enums", "" },
1250 N_("Override the underlying type for wchar_t to `unsigned short'") },
1251 { "-fno-short-wchar", "" },
1254 N_("Enable most warning messages") },
1255 { "-Wbad-function-cast",
1256 N_("Warn about casting functions to incompatible types") },
1257 { "-Wno-bad-function-cast", "" },
1258 { "-Wmissing-format-attribute",
1259 N_("Warn about functions which might be candidates for format attributes") },
1260 { "-Wno-missing-format-attribute", "" },
1262 N_("Warn about casts which discard qualifiers") },
1263 { "-Wno-cast-qual", "" },
1264 { "-Wchar-subscripts",
1265 N_("Warn about subscripts whose type is 'char'") },
1266 { "-Wno-char-subscripts", "" },
1268 N_("Warn if nested comments are detected") },
1269 { "-Wno-comment", "" },
1271 N_("Warn if nested comments are detected") },
1272 { "-Wno-comments", "" },
1274 N_("Warn about possibly confusing type conversions") },
1275 { "-Wno-conversion", "" },
1276 { "-Wdiv-by-zero", "" },
1277 { "-Wno-div-by-zero",
1278 N_("Do not warn about compile-time integer division by zero") },
1280 N_("Warn about testing equality of floating point numbers") },
1281 { "-Wno-float-equal", "" },
1283 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1284 { "-Wno-format", "" },
1285 { "-Wformat-extra-args", "" },
1286 { "-Wno-format-extra-args",
1287 N_("Don't warn about too many arguments to format functions") },
1288 { "-Wformat-nonliteral",
1289 N_("Warn about non-string-literal format strings") },
1290 { "-Wno-format-nonliteral", "" },
1291 { "-Wformat-security",
1292 N_("Warn about possible security problems with format functions") },
1293 { "-Wno-format-security", "" },
1294 { "-Wformat-y2k", "" },
1295 { "-Wno-format-y2k",
1296 N_("Don't warn about strftime formats yielding 2 digit years") },
1297 { "-Wimplicit-function-declaration",
1298 N_("Warn about implicit function declarations") },
1299 { "-Wno-implicit-function-declaration", "" },
1300 { "-Werror-implicit-function-declaration", "" },
1302 N_("Warn when a declaration does not specify a type") },
1303 { "-Wno-implicit-int", "" },
1304 { "-Wimplicit", "" },
1305 { "-Wno-implicit", "" },
1307 N_("Warn about the use of the #import directive") },
1308 { "-Wno-import", "" },
1309 { "-Wlong-long","" },
1311 N_("Do not warn about using 'long long' when -pedantic") },
1313 N_("Warn about suspicious declarations of main") },
1314 { "-Wno-main", "" },
1315 { "-Wmissing-braces",
1316 N_("Warn about possibly missing braces around initializers") },
1317 { "-Wno-missing-braces", "" },
1318 { "-Wmissing-declarations",
1319 N_("Warn about global funcs without previous declarations") },
1320 { "-Wno-missing-declarations", "" },
1321 { "-Wmissing-prototypes",
1322 N_("Warn about global funcs without prototypes") },
1323 { "-Wno-missing-prototypes", "" },
1325 N_("Warn about use of multicharacter literals") },
1326 { "-Wno-multichar", "" },
1327 { "-Wnested-externs",
1328 N_("Warn about externs not at file scope level") },
1329 { "-Wno-nested-externs", "" },
1331 N_("Warn about possible missing parentheses") },
1332 { "-Wno-parentheses", "" },
1333 { "-Wpointer-arith",
1334 N_("Warn about function pointer arithmetic") },
1335 { "-Wno-pointer-arith", "" },
1336 { "-Wredundant-decls",
1337 N_("Warn about multiple declarations of the same object") },
1338 { "-Wno-redundant-decls", "" },
1340 N_("Warn whenever a function's return-type defaults to int") },
1341 { "-Wno-return-type", "" },
1342 { "-Wsequence-point",
1343 N_("Warn about possible violations of sequence point rules") },
1344 { "-Wno-sequence-point", "" },
1346 N_("Warn about signed/unsigned comparisons") },
1347 { "-Wno-sign-compare", "" },
1348 { "-Wstrict-prototypes",
1349 N_("Warn about non-prototyped function decls") },
1350 { "-Wno-strict-prototypes", "" },
1352 N_("Warn about constructs whose meanings change in ISO C") },
1353 { "-Wno-traditional", "" },
1355 N_("Warn when trigraphs are encountered") },
1356 { "-Wno-trigraphs", "" },
1358 { "-Wno-undef", "" },
1359 { "-Wunknown-pragmas",
1360 N_("Warn about unrecognized pragmas") },
1361 { "-Wno-unknown-pragmas", "" },
1362 { "-Wwrite-strings",
1363 N_("Mark strings as 'const char *'") },
1364 { "-Wno-write-strings", "" },
1366 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1368 #include "options.h"
1372 /* Here is a table, controlled by the tm.h file, listing each -m switch
1373 and which bits in `target_switches' it should set or clear.
1374 If VALUE is positive, it is bits to set.
1375 If VALUE is negative, -VALUE is bits to clear.
1376 (The sign bit is not used so there is no confusion.) */
1380 const char *const name;
1382 const char *const description;
1384 target_switches[] = TARGET_SWITCHES;
1386 /* This table is similar, but allows the switch to have a value. */
1388 #ifdef TARGET_OPTIONS
1391 const char *const prefix;
1392 const char **const variable;
1393 const char *const description;
1395 target_options[] = TARGET_OPTIONS;
1398 /* Options controlling warnings. */
1400 /* Don't print warning messages. -w. */
1402 int inhibit_warnings = 0;
1404 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1406 int warn_system_headers = 0;
1408 /* Print various extra warnings. -W. */
1410 int extra_warnings = 0;
1412 /* Treat warnings as errors. -Werror. */
1414 int warnings_are_errors = 0;
1416 /* Nonzero to warn about unused variables, functions et.al. */
1418 int warn_unused_function;
1419 int warn_unused_label;
1420 int warn_unused_parameter;
1421 int warn_unused_variable;
1422 int warn_unused_value;
1424 /* Nonzero to warn about code which is never reached. */
1426 int warn_notreached;
1428 /* Nonzero to warn about variables used before they are initialized. */
1430 int warn_uninitialized;
1432 /* Nonzero means warn about all declarations which shadow others. */
1436 /* Warn if a switch on an enum, that does not have a default case,
1437 fails to have a case for every enum value. */
1441 /* Warn if a switch does not have a default case. */
1443 int warn_switch_default;
1445 /* Warn if a switch on an enum fails to have a case for every enum
1446 value (regardless of the presence or otherwise of a default case). */
1448 int warn_switch_enum;
1450 /* Nonzero means warn about function definitions that default the return type
1451 or that use a null return and have a return-type other than void. */
1453 int warn_return_type;
1455 /* Nonzero means warn about pointer casts that increase the required
1456 alignment of the target type (and might therefore lead to a crash
1457 due to a misaligned access). */
1459 int warn_cast_align;
1461 /* Nonzero means warn about any objects definitions whose size is larger
1462 than N bytes. Also want about function definitions whose returned
1463 values are larger than N bytes. The value N is in `larger_than_size'. */
1465 int warn_larger_than;
1466 HOST_WIDE_INT larger_than_size;
1468 /* Nonzero means warn if inline function is too large. */
1472 /* Warn if a function returns an aggregate,
1473 since there are often incompatible calling conventions for doing this. */
1475 int warn_aggregate_return;
1477 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1481 /* Warn when gcc pads a structure to an alignment boundary. */
1485 /* Warn when an optimization pass is disabled. */
1487 int warn_disabled_optimization;
1489 /* Warn about functions which might be candidates for attribute noreturn. */
1491 int warn_missing_noreturn;
1493 /* Nonzero means warn about uses of __attribute__((deprecated))
1496 int warn_deprecated_decl = 1;
1498 /* Nonzero means warn about constructs which might not be
1499 strict-aliasing safe. */
1501 int warn_strict_aliasing;
1503 /* Likewise for -W. */
1505 static const lang_independent_options W_options[] =
1507 {"unused-function", &warn_unused_function, 1,
1508 N_("Warn when a function is unused") },
1509 {"unused-label", &warn_unused_label, 1,
1510 N_("Warn when a label is unused") },
1511 {"unused-parameter", &warn_unused_parameter, 1,
1512 N_("Warn when a function parameter is unused") },
1513 {"unused-variable", &warn_unused_variable, 1,
1514 N_("Warn when a variable is unused") },
1515 {"unused-value", &warn_unused_value, 1,
1516 N_("Warn when an expression value is unused") },
1517 {"system-headers", &warn_system_headers, 1,
1518 N_("Do not suppress warnings from system headers") },
1519 {"error", &warnings_are_errors, 1,
1520 N_("Treat all warnings as errors") },
1521 {"shadow", &warn_shadow, 1,
1522 N_("Warn when one local variable shadows another") },
1523 {"switch", &warn_switch, 1,
1524 N_("Warn about enumerated switches, with no default, missing a case") },
1525 {"switch-default", &warn_switch_default, 1,
1526 N_("Warn about enumerated switches missing a default case") },
1527 {"switch-enum", &warn_switch_enum, 1,
1528 N_("Warn about all enumerated switches missing a specific case") },
1529 {"aggregate-return", &warn_aggregate_return, 1,
1530 N_("Warn about returning structures, unions or arrays") },
1531 {"cast-align", &warn_cast_align, 1,
1532 N_("Warn about pointer casts which increase alignment") },
1533 {"unreachable-code", &warn_notreached, 1,
1534 N_("Warn about code that will never be executed") },
1535 {"uninitialized", &warn_uninitialized, 1,
1536 N_("Warn about uninitialized automatic variables") },
1537 {"inline", &warn_inline, 1,
1538 N_("Warn when an inlined function cannot be inlined") },
1539 {"packed", &warn_packed, 1,
1540 N_("Warn when the packed attribute has no effect on struct layout") },
1541 {"padded", &warn_padded, 1,
1542 N_("Warn when padding is required to align struct members") },
1543 {"disabled-optimization", &warn_disabled_optimization, 1,
1544 N_("Warn when an optimization pass is disabled") },
1545 {"deprecated-declarations", &warn_deprecated_decl, 1,
1546 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1547 {"missing-noreturn", &warn_missing_noreturn, 1,
1548 N_("Warn about functions which might be candidates for attribute noreturn") },
1549 {"strict-aliasing", &warn_strict_aliasing, 1,
1550 N_ ("Warn about code which might break the strict aliasing rules") }
1554 set_Wunused (setting)
1557 warn_unused_function = setting;
1558 warn_unused_label = setting;
1559 /* Unused function parameter warnings are reported when either ``-W
1560 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1561 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1563 warn_unused_parameter = 0;
1564 else if (!warn_unused_parameter)
1565 warn_unused_parameter = -1;
1566 warn_unused_variable = setting;
1567 warn_unused_value = setting;
1570 /* The following routines are useful in setting all the flags that
1571 -ffast-math and -fno-fast-math imply. */
1574 set_fast_math_flags (set)
1577 flag_trapping_math = !set;
1578 flag_unsafe_math_optimizations = set;
1579 flag_finite_math_only = set;
1580 flag_errno_math = !set;
1582 flag_signaling_nans = 0;
1585 /* Return true iff flags are set as if -ffast-math. */
1587 fast_math_flags_set_p ()
1589 return (!flag_trapping_math
1590 && flag_unsafe_math_optimizations
1591 && flag_finite_math_only
1592 && !flag_errno_math);
1596 /* Output files for assembler code (real compiler output)
1597 and debugging dumps. */
1600 FILE *aux_info_file;
1601 FILE *rtl_dump_file = NULL;
1603 /* Decode the string P as an integral parameter.
1604 If the string is indeed an integer return its numeric value else
1605 issue an Invalid Option error for the option PNAME and return DEFVAL.
1606 If PNAME is zero just return DEFVAL, do not call error. */
1609 read_integral_parameter (p, pname, defval)
1614 const char *endp = p;
1618 if (ISDIGIT (*endp))
1627 error ("invalid option `%s'", pname);
1634 /* This calls abort and is used to avoid problems when abort is a macro.
1635 It is used when we need to pass the address of abort. */
1643 /* When `malloc.c' is compiled with `rcheck' defined,
1644 it calls this function to report clobberage. */
1648 const char *s ATTRIBUTE_UNUSED;
1653 /* Return the logarithm of X, base 2, considering X unsigned,
1654 if X is a power of 2. Otherwise, returns -1.
1656 This should be used via the `exact_log2' macro. */
1660 unsigned HOST_WIDE_INT x;
1663 /* Test for 0 or a power of 2. */
1664 if (x == 0 || x != (x & -x))
1666 while ((x >>= 1) != 0)
1671 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1672 If X is 0, return -1.
1674 This should be used via the floor_log2 macro. */
1678 unsigned HOST_WIDE_INT x;
1687 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1688 into ICE messages, which is much more user friendly. */
1691 crash_signal (signo)
1694 internal_error ("%s", strsignal (signo));
1697 /* Strip off a legitimate source ending from the input string NAME of
1698 length LEN. Rather than having to know the names used by all of
1699 our front ends, we strip off an ending of a period followed by
1700 up to five characters. (Java uses ".class".) */
1703 strip_off_ending (name, len)
1708 for (i = 2; i < 6 && len > i; i++)
1710 if (name[len - i] == '.')
1712 name[len - i] = '\0';
1718 /* Output a quoted string. */
1721 output_quoted_string (asm_file, string)
1725 #ifdef OUTPUT_QUOTED_STRING
1726 OUTPUT_QUOTED_STRING (asm_file, string);
1730 putc ('\"', asm_file);
1731 while ((c = *string++) != 0)
1735 if (c == '\"' || c == '\\')
1736 putc ('\\', asm_file);
1740 fprintf (asm_file, "\\%03o", (unsigned char) c);
1742 putc ('\"', asm_file);
1746 /* Output NAME into FILE after having turned it into something
1747 usable as an identifier in a target's assembly file. */
1749 output_clean_symbol_name (file, name)
1753 /* Make a copy of NAME. */
1754 char *id = xstrdup (name);
1756 /* Make it look like a valid identifier for an assembler. */
1757 clean_symbol_name (id);
1764 /* Output a file name in the form wanted by System V. */
1767 output_file_directive (asm_file, input_name)
1769 const char *input_name;
1771 int len = strlen (input_name);
1772 const char *na = input_name + len;
1774 /* NA gets INPUT_NAME sans directory names. */
1775 while (na > input_name)
1777 if (IS_DIR_SEPARATOR (na[-1]))
1782 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1783 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1785 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1786 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1788 fprintf (asm_file, "\t.file\t");
1789 output_quoted_string (asm_file, na);
1790 fputc ('\n', asm_file);
1795 /* Routine to open a dump file. Return true if the dump file is enabled. */
1798 open_dump_file (index, decl)
1799 enum dump_file_index index;
1803 const char *open_arg;
1806 if (! dump_file[index].enabled)
1809 timevar_push (TV_DUMP);
1810 if (rtl_dump_file != NULL)
1811 fclose (rtl_dump_file);
1813 sprintf (seq, DUMPFILE_FORMAT, index);
1815 if (! dump_file[index].initialized)
1817 /* If we've not initialized the files, do so now. */
1818 if (graph_dump_format != no_graph
1819 && dump_file[index].graph_dump_p)
1821 dump_name = concat (seq, dump_file[index].extension, NULL);
1822 clean_graph_dump_file (dump_base_name, dump_name);
1825 dump_file[index].initialized = 1;
1831 dump_name = concat (dump_base_name, seq,
1832 dump_file[index].extension, NULL);
1834 rtl_dump_file = fopen (dump_name, open_arg);
1835 if (rtl_dump_file == NULL)
1836 fatal_io_error ("can't open %s", dump_name);
1841 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1842 (*lang_hooks.decl_printable_name) (decl, 2),
1843 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1845 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1846 ? " (unlikely executed)"
1849 timevar_pop (TV_DUMP);
1853 /* Routine to close a dump file. */
1856 close_dump_file (index, func, insns)
1857 enum dump_file_index index;
1858 void (*func) PARAMS ((FILE *, rtx));
1861 if (! rtl_dump_file)
1864 timevar_push (TV_DUMP);
1866 && graph_dump_format != no_graph
1867 && dump_file[index].graph_dump_p)
1872 sprintf (seq, DUMPFILE_FORMAT, index);
1873 suffix = concat (seq, dump_file[index].extension, NULL);
1874 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1879 func (rtl_dump_file, insns);
1881 fflush (rtl_dump_file);
1882 fclose (rtl_dump_file);
1884 rtl_dump_file = NULL;
1885 timevar_pop (TV_DUMP);
1888 /* Do any final processing required for the declarations in VEC, of
1889 which there are LEN. We write out inline functions and variables
1890 that have been deferred until this point, but which are required.
1891 Returns nonzero if anything was put out. */
1894 wrapup_global_declarations (vec, len)
1901 int output_something = 0;
1903 for (i = 0; i < len; i++)
1907 /* We're not deferring this any longer. Assignment is
1908 conditional to avoid needlessly dirtying PCH pages. */
1909 if (DECL_DEFER_OUTPUT (decl) != 0)
1910 DECL_DEFER_OUTPUT (decl) = 0;
1912 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1913 (*lang_hooks.finish_incomplete_decl) (decl);
1916 /* Now emit any global variables or functions that we have been
1917 putting off. We need to loop in case one of the things emitted
1918 here references another one which comes earlier in the list. */
1922 for (i = 0; i < len; i++)
1926 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1929 /* Don't write out static consts, unless we still need them.
1931 We also keep static consts if not optimizing (for debugging),
1932 unless the user specified -fno-keep-static-consts.
1933 ??? They might be better written into the debug information.
1934 This is possible when using DWARF.
1936 A language processor that wants static constants to be always
1937 written out (even if it is not used) is responsible for
1938 calling rest_of_decl_compilation itself. E.g. the C front-end
1939 calls rest_of_decl_compilation from finish_decl.
1940 One motivation for this is that is conventional in some
1941 environments to write things like:
1942 static const char rcsid[] = "... version string ...";
1943 intending to force the string to be in the executable.
1945 A language processor that would prefer to have unneeded
1946 static constants "optimized away" would just defer writing
1947 them out until here. E.g. C++ does this, because static
1948 constants are often defined in header files.
1950 ??? A tempting alternative (for both C and C++) would be
1951 to force a constant to be written if and only if it is
1952 defined in a main file, as opposed to an include file. */
1954 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1958 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1960 else if (DECL_COMDAT (decl))
1962 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1963 && (optimize || !flag_keep_static_consts
1964 || DECL_ARTIFICIAL (decl)))
1970 rest_of_decl_compilation (decl, NULL, 1, 1);
1974 if (TREE_CODE (decl) == FUNCTION_DECL
1975 && DECL_INITIAL (decl) != 0
1976 && DECL_SAVED_INSNS (decl) != 0
1977 && (flag_keep_inline_functions
1978 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1982 output_inline_function (decl);
1987 output_something = 1;
1991 return output_something;
1994 /* Issue appropriate warnings for the global declarations in VEC (of
1995 which there are LEN). Output debugging information for them. */
1998 check_global_declarations (vec, len)
2005 for (i = 0; i < len; i++)
2009 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2010 && ! TREE_ASM_WRITTEN (decl))
2011 /* Cancel the RTL for this decl so that, if debugging info
2012 output for global variables is still to come,
2013 this one will be omitted. */
2014 SET_DECL_RTL (decl, NULL_RTX);
2016 /* Warn about any function
2017 declared static but not defined.
2018 We don't warn about variables,
2019 because many programs have static variables
2020 that exist only to get some text into the object file. */
2021 if (TREE_CODE (decl) == FUNCTION_DECL
2022 && (warn_unused_function
2023 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2024 && DECL_INITIAL (decl) == 0
2025 && DECL_EXTERNAL (decl)
2026 && ! DECL_ARTIFICIAL (decl)
2027 && ! TREE_PUBLIC (decl))
2029 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2030 pedwarn_with_decl (decl,
2031 "`%s' used but never defined");
2033 warning_with_decl (decl,
2034 "`%s' declared `static' but never defined");
2035 /* This symbol is effectively an "extern" declaration now. */
2036 TREE_PUBLIC (decl) = 1;
2037 assemble_external (decl);
2040 /* Warn about static fns or vars defined but not used. */
2041 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2042 /* We don't warn about "static const" variables because the
2043 "rcs_id" idiom uses that construction. */
2044 || (warn_unused_variable
2045 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2046 && ! DECL_IN_SYSTEM_HEADER (decl)
2047 && ! TREE_USED (decl)
2048 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2049 to handle multiple external decls in different scopes. */
2050 && ! TREE_USED (DECL_NAME (decl))
2051 && ! DECL_EXTERNAL (decl)
2052 && ! TREE_PUBLIC (decl)
2053 /* Global register variables must be declared to reserve them. */
2054 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2055 /* Otherwise, ask the language. */
2056 && (*lang_hooks.decls.warn_unused_global) (decl))
2057 warning_with_decl (decl, "`%s' defined but not used");
2059 /* Avoid confusing the debug information machinery when there are
2061 if (errorcount == 0 && sorrycount == 0)
2063 timevar_push (TV_SYMOUT);
2064 (*debug_hooks->global_decl) (decl);
2065 timevar_pop (TV_SYMOUT);
2070 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2071 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2072 INPUT_FILENAME and LINENO accordingly. */
2075 push_srcloc (file, line)
2079 struct file_stack *fs;
2081 if (input_file_stack)
2083 input_file_stack->name = input_filename;
2084 input_file_stack->line = lineno;
2087 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2088 fs->name = input_filename = file;
2089 fs->line = lineno = line;
2090 fs->next = input_file_stack;
2091 input_file_stack = fs;
2092 input_file_stack_tick++;
2095 /* Pop the top entry off the stack of presently open source files.
2096 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2102 struct file_stack *fs;
2104 fs = input_file_stack;
2105 input_file_stack = fs->next;
2107 input_file_stack_tick++;
2108 /* The initial source file is never popped. */
2109 if (!input_file_stack)
2111 input_filename = input_file_stack->name;
2112 lineno = input_file_stack->line;
2115 /* Compile an entire translation unit. Write a file of assembly
2116 output and various debugging dumps. */
2121 /* Initialize yet another pass. */
2123 init_final (main_input_filename);
2124 init_branch_prob (aux_base_name);
2126 timevar_push (TV_PARSE);
2128 /* Call the parser, which parses the entire file (calling
2129 rest_of_compilation for each function). */
2130 (*lang_hooks.parse_file) (set_yydebug);
2132 /* In case there were missing block closers,
2133 get us back to the global binding level. */
2134 (*lang_hooks.clear_binding_stack) ();
2136 /* Compilation is now finished except for writing
2137 what's left of the symbol table output. */
2138 timevar_pop (TV_PARSE);
2140 if (flag_syntax_only)
2143 (*lang_hooks.decls.final_write_globals)();
2145 /* This must occur after the loop to output deferred functions. Else
2146 the profiler initializer would not be emitted if all the functions
2147 in this compilation unit were deferred.
2149 output_func_start_profiler can not cause any additional functions or
2150 data to need to be output, so it need not be in the deferred function
2152 output_func_start_profiler ();
2154 /* Write out any pending weak symbol declarations. */
2158 /* Do dbx symbols. */
2159 timevar_push (TV_SYMOUT);
2161 #ifdef DWARF2_UNWIND_INFO
2162 if (dwarf2out_do_frame ())
2163 dwarf2out_frame_finish ();
2166 (*debug_hooks->finish) (main_input_filename);
2167 timevar_pop (TV_SYMOUT);
2169 /* Output some stuff at end of file if nec. */
2171 dw2_output_indirect_constants ();
2173 end_final (aux_base_name);
2175 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2177 timevar_push (TV_DUMP);
2178 open_dump_file (DFI_bp, NULL);
2182 close_dump_file (DFI_bp, NULL, NULL_RTX);
2183 timevar_pop (TV_DUMP);
2187 ASM_FILE_END (asm_out_file);
2190 /* Attach a special .ident directive to the end of the file to identify
2191 the version of GCC which compiled this code. The format of the .ident
2192 string is patterned after the ones produced by native SVR4 compilers. */
2195 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2196 IDENT_ASM_OP, version_string);
2199 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2201 timevar_push (TV_DUMP);
2202 dump_combine_total_stats (rtl_dump_file);
2203 close_dump_file (DFI_combine, NULL, NULL_RTX);
2204 timevar_pop (TV_DUMP);
2208 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2209 and TYPE_DECL nodes.
2211 This does nothing for local (non-static) variables, unless the
2212 variable is a register variable with an ASMSPEC. In that case, or
2213 if the variable is not an automatic, it sets up the RTL and
2214 outputs any assembler code (label definition, storage allocation
2215 and initialization).
2217 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2218 the assembler symbol name to be used. TOP_LEVEL is nonzero
2219 if this declaration is not within a function. */
2222 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2224 const char *asmspec;
2228 /* Declarations of variables, and of functions defined elsewhere. */
2230 /* The most obvious approach, to put an #ifndef around where
2231 this macro is used, doesn't work since it's inside a macro call. */
2232 #ifndef ASM_FINISH_DECLARE_OBJECT
2233 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2236 /* We deferred calling assemble_alias so that we could collect
2237 other attributes such as visibility. Emit the alias now. */
2240 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2243 alias = TREE_VALUE (TREE_VALUE (alias));
2244 alias = get_identifier (TREE_STRING_POINTER (alias));
2245 assemble_alias (decl, alias);
2249 /* Forward declarations for nested functions are not "external",
2250 but we need to treat them as if they were. */
2251 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2252 || TREE_CODE (decl) == FUNCTION_DECL)
2254 timevar_push (TV_VARCONST);
2257 make_decl_rtl (decl, asmspec);
2259 /* Don't output anything when a tentative file-scope definition
2260 is seen. But at end of compilation, do output code for them. */
2261 if (at_end || !DECL_DEFER_OUTPUT (decl))
2262 assemble_variable (decl, top_level, at_end, 0);
2263 if (decl == last_assemble_variable_decl)
2265 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2269 timevar_pop (TV_VARCONST);
2271 else if (DECL_REGISTER (decl) && asmspec != 0)
2273 if (decode_reg_name (asmspec) >= 0)
2275 SET_DECL_RTL (decl, NULL_RTX);
2276 make_decl_rtl (decl, asmspec);
2280 error ("invalid register name `%s' for register variable", asmspec);
2281 DECL_REGISTER (decl) = 0;
2286 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2287 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2288 && TREE_CODE (decl) == TYPE_DECL)
2290 timevar_push (TV_SYMOUT);
2291 dbxout_symbol (decl, 0);
2292 timevar_pop (TV_SYMOUT);
2295 #ifdef SDB_DEBUGGING_INFO
2296 else if (write_symbols == SDB_DEBUG && top_level
2297 && TREE_CODE (decl) == TYPE_DECL)
2299 timevar_push (TV_SYMOUT);
2300 sdbout_symbol (decl, 0);
2301 timevar_pop (TV_SYMOUT);
2304 #ifdef DWARF2_DEBUGGING_INFO
2305 else if ((write_symbols == DWARF2_DEBUG
2306 || write_symbols == VMS_AND_DWARF2_DEBUG)
2308 && TREE_CODE (decl) == TYPE_DECL)
2310 timevar_push (TV_SYMOUT);
2311 dwarf2out_decl (decl);
2312 timevar_pop (TV_SYMOUT);
2317 /* Called after finishing a record, union or enumeral type. */
2320 rest_of_type_compilation (type, toplev)
2321 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2325 tree type ATTRIBUTE_UNUSED;
2326 int toplev ATTRIBUTE_UNUSED;
2329 /* Avoid confusing the debug information machinery when there are
2331 if (errorcount != 0 || sorrycount != 0)
2334 timevar_push (TV_SYMOUT);
2335 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2336 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2337 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2339 #ifdef SDB_DEBUGGING_INFO
2340 if (write_symbols == SDB_DEBUG)
2341 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2343 #ifdef DWARF2_DEBUGGING_INFO
2344 if ((write_symbols == DWARF2_DEBUG
2345 || write_symbols == VMS_AND_DWARF2_DEBUG)
2347 dwarf2out_decl (TYPE_STUB_DECL (type));
2349 timevar_pop (TV_SYMOUT);
2352 /* This is called from finish_function (within langhooks.parse_file)
2353 after each top-level definition is parsed.
2354 It is supposed to compile that function or variable
2355 and output the assembler code for it.
2356 After we return, the tree storage is freed. */
2359 rest_of_compilation (decl)
2365 int rebuild_label_notes_after_reload;
2366 int register_life_up_to_date;
2368 timevar_push (TV_REST_OF_COMPILATION);
2370 /* Now that we're out of the frontend, we shouldn't have any more
2371 CONCATs anywhere. */
2372 generating_concat_p = 0;
2374 /* When processing delayed functions, prepare_function_start() won't
2375 have been run to re-initialize it. */
2376 cse_not_expected = ! optimize;
2378 /* First, make sure that NOTE_BLOCK is set correctly for each
2379 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2380 if (!cfun->x_whole_function_mode_p)
2383 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2384 tree in sensible shape. So, we just recalculate it here. */
2385 if (cfun->x_whole_function_mode_p)
2390 /* If we are reconsidering an inline function
2391 at the end of compilation, skip the stuff for making it inline. */
2393 if (DECL_SAVED_INSNS (decl) == 0)
2399 /* If this is nested inside an inlined external function, pretend
2400 it was only declared. Since we cannot inline such functions,
2401 generating code for this one is not only not necessary but will
2402 confuse some debugging output writers. */
2403 for (parent = DECL_CONTEXT (current_function_decl);
2404 parent != NULL_TREE;
2405 parent = get_containing_scope (parent))
2406 if (TREE_CODE (parent) == FUNCTION_DECL
2407 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2409 DECL_INITIAL (decl) = 0;
2410 goto exit_rest_of_compilation;
2412 else if (TYPE_P (parent))
2413 /* A function in a local class should be treated normally. */
2416 /* If requested, consider whether to make this function inline. */
2417 if ((DECL_INLINE (decl) && !flag_no_inline)
2418 || flag_inline_functions)
2420 timevar_push (TV_INTEGRATION);
2421 lose = function_cannot_inline_p (decl);
2422 timevar_pop (TV_INTEGRATION);
2423 if (lose || ! optimize)
2425 if (warn_inline && DECL_INLINE (decl))
2426 warning_with_decl (decl, lose);
2427 DECL_ABSTRACT_ORIGIN (decl) = 0;
2428 /* Don't really compile an extern inline function.
2429 If we can't make it inline, pretend
2430 it was only declared. */
2431 if (DECL_EXTERNAL (decl))
2433 DECL_INITIAL (decl) = 0;
2434 goto exit_rest_of_compilation;
2439 /* ??? Note that we used to just make it look like if
2440 the "inline" keyword was specified when we decide
2441 to inline it (because of -finline-functions).
2442 garloff at suse dot de, 2002-04-24: Add another flag to
2443 actually record this piece of information. */
2444 if (!DECL_INLINE (decl))
2445 DID_INLINE_FUNC (decl) = 1;
2446 inlinable = DECL_INLINE (decl) = 1;
2450 insns = get_insns ();
2452 /* Dump the rtl code if we are dumping rtl. */
2454 if (open_dump_file (DFI_rtl, decl))
2456 if (DECL_SAVED_INSNS (decl))
2457 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2458 close_dump_file (DFI_rtl, print_rtl, insns);
2461 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2462 sorts of eh initialization. Delay this until after the
2463 initial rtl dump so that we can see the original nesting. */
2464 convert_from_eh_region_ranges ();
2466 /* If function is inline, and we don't yet know whether to
2467 compile it by itself, defer decision till end of compilation.
2468 wrapup_global_declarations will (indirectly) call
2469 rest_of_compilation again for those functions that need to
2470 be output. Also defer those functions that we are supposed
2474 || (DECL_INLINE (decl)
2475 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2476 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2477 && ! flag_keep_inline_functions)
2478 || DECL_EXTERNAL (decl))))
2479 DECL_DEFER_OUTPUT (decl) = 1;
2481 if (DECL_INLINE (decl))
2482 /* DWARF wants separate debugging info for abstract and
2483 concrete instances of all inline functions, including those
2484 declared inline but not inlined, and those inlined even
2485 though they weren't declared inline. Conveniently, that's
2486 what DECL_INLINE means at this point. */
2487 (*debug_hooks->deferred_inline_function) (decl);
2489 if (DECL_DEFER_OUTPUT (decl))
2491 /* If -Wreturn-type, we have to do a bit of compilation. We just
2492 want to call cleanup the cfg to figure out whether or not we can
2493 fall off the end of the function; we do the minimum amount of
2494 work necessary to make that safe. */
2495 if (warn_return_type)
2497 int saved_optimize = optimize;
2500 rebuild_jump_labels (insns);
2501 find_exception_handler_labels ();
2502 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2503 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2504 optimize = saved_optimize;
2506 /* CFG is no longer maintained up-to-date. */
2507 free_bb_for_insn ();
2510 set_nothrow_function_flags ();
2511 if (current_function_nothrow)
2512 /* Now we know that this can't throw; set the flag for the benefit
2513 of other functions later in this translation unit. */
2514 TREE_NOTHROW (current_function_decl) = 1;
2516 timevar_push (TV_INTEGRATION);
2517 save_for_inline (decl);
2518 timevar_pop (TV_INTEGRATION);
2519 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2520 goto exit_rest_of_compilation;
2523 /* If specified extern inline but we aren't inlining it, we are
2524 done. This goes for anything that gets here with DECL_EXTERNAL
2525 set, not just things with DECL_INLINE. */
2526 if (DECL_EXTERNAL (decl))
2527 goto exit_rest_of_compilation;
2530 /* If we're emitting a nested function, make sure its parent gets
2531 emitted as well. Doing otherwise confuses debug info. */
2534 for (parent = DECL_CONTEXT (current_function_decl);
2535 parent != NULL_TREE;
2536 parent = get_containing_scope (parent))
2537 if (TREE_CODE (parent) == FUNCTION_DECL)
2538 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2541 /* We are now committed to emitting code for this function. Do any
2542 preparation, such as emitting abstract debug info for the inline
2543 before it gets mangled by optimization. */
2544 if (DECL_INLINE (decl))
2545 (*debug_hooks->outlining_inline_function) (decl);
2547 /* Remove any notes we don't need. That will make iterating
2548 over the instruction sequence faster, and allow the garbage
2549 collector to reclaim the memory used by the notes. */
2550 remove_unnecessary_notes ();
2555 /* Initialize some variables used by the optimizers. */
2556 init_function_for_compilation ();
2558 if (! DECL_DEFER_OUTPUT (decl))
2559 TREE_ASM_WRITTEN (decl) = 1;
2561 /* Now that integrate will no longer see our rtl, we need not
2562 distinguish between the return value of this function and the
2563 return value of called functions. Also, we can remove all SETs
2564 of subregs of hard registers; they are only here because of
2565 integrate. Also, we can now initialize pseudos intended to
2566 carry magic hard reg data throughout the function. */
2567 rtx_equal_function_value_matters = 0;
2568 purge_hard_subreg_sets (get_insns ());
2570 /* Early return if there were errors. We can run afoul of our
2571 consistency checks, and there's not really much point in fixing them.
2572 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2573 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2574 || errorcount || sorrycount)
2575 goto exit_rest_of_compilation;
2577 timevar_push (TV_JUMP);
2578 open_dump_file (DFI_sibling, decl);
2579 insns = get_insns ();
2580 rebuild_jump_labels (insns);
2581 find_exception_handler_labels ();
2582 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2584 delete_unreachable_blocks ();
2586 /* We have to issue these warnings now already, because CFG cleanups
2587 further down may destroy the required information. */
2588 check_function_return_warnings ();
2590 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2591 if (flag_guess_branch_prob)
2593 timevar_push (TV_BRANCH_PROB);
2594 note_prediction_to_br_prob ();
2595 timevar_pop (TV_BRANCH_PROB);
2598 /* We may have potential sibling or tail recursion sites. Select one
2599 (of possibly multiple) methods of performing the call. */
2600 if (flag_optimize_sibling_calls)
2603 optimize_sibling_and_tail_recursive_calls ();
2605 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2606 free_bb_for_insn ();
2607 find_exception_handler_labels ();
2608 rebuild_jump_labels (insns);
2609 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2611 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2612 notes before simplifying cfg and we must do lowering after sibcall
2613 that unhides parts of RTL chain and cleans up the CFG.
2615 Until sibcall is replaced by tree-level optimizer, lets just
2616 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2617 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2618 if (GET_CODE (insn) == NOTE
2619 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2622 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2623 timevar_pop (TV_JUMP);
2625 scope_to_insns_initialize ();
2626 /* Complete generation of exception handling code. */
2629 timevar_push (TV_JUMP);
2630 open_dump_file (DFI_eh, decl);
2632 finish_eh_generation ();
2634 close_dump_file (DFI_eh, print_rtl, get_insns ());
2635 timevar_pop (TV_JUMP);
2638 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2639 generation, which might create new sets. */
2640 emit_initial_value_sets ();
2643 /* If we are doing position-independent code generation, now
2644 is the time to output special prologues and epilogues.
2645 We do not want to do this earlier, because it just clutters
2646 up inline functions with meaningless insns. */
2651 insns = get_insns ();
2653 /* Copy any shared structure that should not be shared. */
2654 unshare_all_rtl (current_function_decl, insns);
2656 #ifdef SETJMP_VIA_SAVE_AREA
2657 /* This must be performed before virtual register instantiation.
2658 Please be aware the everything in the compiler that can look
2659 at the RTL up to this point must understand that REG_SAVE_AREA
2660 is just like a use of the REG contained inside. */
2661 if (current_function_calls_alloca)
2662 optimize_save_area_alloca (insns);
2665 /* Instantiate all virtual registers. */
2666 instantiate_virtual_regs (current_function_decl, insns);
2668 open_dump_file (DFI_jump, decl);
2670 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2671 are initialized and to compute whether control can drop off the end
2674 timevar_push (TV_JUMP);
2675 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2676 before jump optimization switches branch directions. */
2677 if (flag_guess_branch_prob)
2678 expected_value_to_br_prob ();
2680 reg_scan (insns, max_reg_num (), 0);
2681 rebuild_jump_labels (insns);
2682 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2683 delete_trivially_dead_insns (insns, max_reg_num ());
2685 dump_flow_info (rtl_dump_file);
2686 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2687 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2689 /* CFG is no longer maintained up-to-date. */
2692 free_bb_for_insn ();
2693 copy_loop_headers (insns);
2694 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2696 purge_line_number_notes (insns);
2698 timevar_pop (TV_JUMP);
2699 close_dump_file (DFI_jump, print_rtl, insns);
2701 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2702 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2704 goto exit_rest_of_compilation;
2707 /* Long term, this should probably move before the jump optimizer too,
2708 but I didn't want to disturb the rtl_dump_and_exit and related
2709 stuff at this time. */
2710 if (optimize > 0 && flag_ssa)
2712 /* Convert to SSA form. */
2714 timevar_push (TV_TO_SSA);
2715 open_dump_file (DFI_ssa, decl);
2717 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2720 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2721 timevar_pop (TV_TO_SSA);
2723 /* Perform sparse conditional constant propagation, if requested. */
2726 timevar_push (TV_SSA_CCP);
2727 open_dump_file (DFI_ssa_ccp, decl);
2731 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2732 timevar_pop (TV_SSA_CCP);
2735 /* It would be useful to cleanup the CFG at this point, but block
2736 merging and possibly other transformations might leave a PHI
2737 node in the middle of a basic block, which is a strict no-no. */
2739 /* The SSA implementation uses basic block numbers in its phi
2740 nodes. Thus, changing the control-flow graph or the basic
2741 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2742 may cause problems. */
2746 /* Remove dead code. */
2748 timevar_push (TV_SSA_DCE);
2749 open_dump_file (DFI_ssa_dce, decl);
2751 insns = get_insns ();
2752 ssa_eliminate_dead_code ();
2754 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2755 timevar_pop (TV_SSA_DCE);
2758 /* Convert from SSA form. */
2760 timevar_push (TV_FROM_SSA);
2761 open_dump_file (DFI_ussa, decl);
2763 convert_from_ssa ();
2764 /* New registers have been created. Rescan their usage. */
2765 reg_scan (insns, max_reg_num (), 1);
2767 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2768 timevar_pop (TV_FROM_SSA);
2773 timevar_push (TV_JUMP);
2775 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2777 /* Try to identify useless null pointer tests and delete them. */
2778 if (flag_delete_null_pointer_checks)
2780 open_dump_file (DFI_null, decl);
2782 dump_flow_info (rtl_dump_file);
2784 if (delete_null_pointer_checks (insns))
2785 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2787 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2790 /* Jump optimization, and the removal of NULL pointer checks, may
2791 have reduced the number of instructions substantially. CSE, and
2792 future passes, allocate arrays whose dimensions involve the
2793 maximum instruction UID, so if we can reduce the maximum UID
2794 we'll save big on memory. */
2795 renumber_insns (rtl_dump_file);
2796 timevar_pop (TV_JUMP);
2798 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2802 /* Perform common subexpression elimination.
2803 Nonzero value from `cse_main' means that jumps were simplified
2804 and some code may now be unreachable, so do
2805 jump optimization again. */
2809 open_dump_file (DFI_cse, decl);
2811 dump_flow_info (rtl_dump_file);
2812 timevar_push (TV_CSE);
2814 reg_scan (insns, max_reg_num (), 1);
2816 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2818 rebuild_jump_labels (insns);
2819 purge_all_dead_edges (0);
2821 delete_trivially_dead_insns (insns, max_reg_num ());
2823 /* If we are not running more CSE passes, then we are no longer
2824 expecting CSE to be run. But always rerun it in a cheap mode. */
2825 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2827 if (tem || optimize > 1)
2828 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2829 /* Try to identify useless null pointer tests and delete them. */
2830 if (flag_delete_null_pointer_checks)
2832 timevar_push (TV_JUMP);
2834 if (delete_null_pointer_checks (insns))
2835 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2836 timevar_pop (TV_JUMP);
2839 /* The second pass of jump optimization is likely to have
2840 removed a bunch more instructions. */
2841 renumber_insns (rtl_dump_file);
2843 timevar_pop (TV_CSE);
2844 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2847 open_dump_file (DFI_addressof, decl);
2849 purge_addressof (insns);
2850 if (optimize && purge_all_dead_edges (0))
2851 delete_unreachable_blocks ();
2852 reg_scan (insns, max_reg_num (), 1);
2854 close_dump_file (DFI_addressof, print_rtl, insns);
2858 /* Perform global cse. */
2860 if (optimize > 0 && flag_gcse)
2862 int save_csb, save_cfj;
2865 timevar_push (TV_GCSE);
2866 open_dump_file (DFI_gcse, decl);
2868 tem = gcse_main (insns, rtl_dump_file);
2869 rebuild_jump_labels (insns);
2870 delete_trivially_dead_insns (insns, max_reg_num ());
2872 save_csb = flag_cse_skip_blocks;
2873 save_cfj = flag_cse_follow_jumps;
2874 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2876 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2878 if (flag_expensive_optimizations)
2880 timevar_push (TV_CSE);
2881 reg_scan (insns, max_reg_num (), 1);
2882 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2883 purge_all_dead_edges (0);
2884 delete_trivially_dead_insns (insns, max_reg_num ());
2885 timevar_pop (TV_CSE);
2886 cse_not_expected = !flag_rerun_cse_after_loop;
2889 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2890 things up. Then possibly re-run CSE again. */
2894 timevar_push (TV_JUMP);
2895 rebuild_jump_labels (insns);
2896 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2897 timevar_pop (TV_JUMP);
2899 if (flag_expensive_optimizations)
2901 timevar_push (TV_CSE);
2902 reg_scan (insns, max_reg_num (), 1);
2903 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2904 purge_all_dead_edges (0);
2905 delete_trivially_dead_insns (insns, max_reg_num ());
2906 timevar_pop (TV_CSE);
2910 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2911 timevar_pop (TV_GCSE);
2914 flag_cse_skip_blocks = save_csb;
2915 flag_cse_follow_jumps = save_cfj;
2916 #ifdef ENABLE_CHECKING
2917 verify_flow_info ();
2921 /* Move constant computations out of loops. */
2923 if (optimize > 0 && flag_loop_optimize)
2925 int do_unroll, do_prefetch;
2927 timevar_push (TV_LOOP);
2928 delete_dead_jumptables ();
2929 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2930 open_dump_file (DFI_loop, decl);
2931 /* CFG is no longer maintained up-to-date. */
2932 free_bb_for_insn ();
2934 do_unroll = flag_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2935 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2936 if (flag_rerun_loop_opt)
2938 cleanup_barriers ();
2940 /* We only want to perform unrolling once. */
2941 loop_optimize (insns, rtl_dump_file, do_unroll);
2944 /* The first call to loop_optimize makes some instructions
2945 trivially dead. We delete those instructions now in the
2946 hope that doing so will make the heuristics in loop work
2947 better and possibly speed up compilation. */
2948 delete_trivially_dead_insns (insns, max_reg_num ());
2950 /* The regscan pass is currently necessary as the alias
2951 analysis code depends on this information. */
2952 reg_scan (insns, max_reg_num (), 1);
2954 cleanup_barriers ();
2955 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2957 /* Loop can create trivially dead instructions. */
2958 delete_trivially_dead_insns (insns, max_reg_num ());
2959 close_dump_file (DFI_loop, print_rtl, insns);
2960 timevar_pop (TV_LOOP);
2961 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2966 /* Do control and data flow analysis; wrote some of the results to
2969 timevar_push (TV_FLOW);
2970 open_dump_file (DFI_cfg, decl);
2972 dump_flow_info (rtl_dump_file);
2974 cleanup_cfg (CLEANUP_EXPENSIVE
2975 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2977 /* It may make more sense to mark constant functions after dead code is
2978 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2979 may insert code making function non-constant, but we still must consider
2980 it as constant, otherwise -fbranch-probabilities will not read data back.
2982 life_analyzis rarely eliminates modification of external memory.
2985 mark_constant_function ();
2987 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2989 /* Do branch profiling and static profile estimation passes. */
2990 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
2994 timevar_push (TV_BRANCH_PROB);
2995 open_dump_file (DFI_bp, decl);
2996 if (cfun->arc_profile || flag_branch_probabilities)
2999 /* Discover and record the loop depth at the head of each basic
3000 block. The loop infrastructure does the real job for us. */
3001 flow_loops_find (&loops, LOOP_TREE);
3004 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3006 /* Estimate using heuristics if no profiling info is available. */
3007 if (flag_guess_branch_prob)
3008 estimate_probability (&loops);
3010 flow_loops_free (&loops);
3011 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3012 timevar_pop (TV_BRANCH_PROB);
3016 open_dump_file (DFI_ce1, decl);
3017 if (flag_if_conversion)
3019 timevar_push (TV_IFCVT);
3021 dump_flow_info (rtl_dump_file);
3022 cleanup_cfg (CLEANUP_EXPENSIVE);
3023 reg_scan (insns, max_reg_num (), 0);
3025 timevar_pop (TV_IFCVT);
3027 timevar_push (TV_JUMP);
3028 cleanup_cfg (CLEANUP_EXPENSIVE);
3029 reg_scan (insns, max_reg_num (), 0);
3030 timevar_pop (TV_JUMP);
3031 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3035 timevar_push (TV_TRACER);
3036 open_dump_file (DFI_tracer, decl);
3038 dump_flow_info (rtl_dump_file);
3040 cleanup_cfg (CLEANUP_EXPENSIVE);
3041 reg_scan (insns, max_reg_num (), 0);
3042 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3043 timevar_pop (TV_TRACER);
3046 if (flag_rerun_cse_after_loop)
3048 timevar_push (TV_CSE2);
3049 open_dump_file (DFI_cse2, decl);
3051 dump_flow_info (rtl_dump_file);
3052 /* CFG is no longer maintained up-to-date. */
3053 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3054 purge_all_dead_edges (0);
3055 delete_trivially_dead_insns (insns, max_reg_num ());
3059 timevar_push (TV_JUMP);
3060 rebuild_jump_labels (insns);
3061 cleanup_cfg (CLEANUP_EXPENSIVE);
3062 timevar_pop (TV_JUMP);
3064 reg_scan (insns, max_reg_num (), 0);
3065 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3067 timevar_pop (TV_CSE2);
3070 cse_not_expected = 1;
3072 open_dump_file (DFI_life, decl);
3075 #ifdef ENABLE_CHECKING
3076 verify_flow_info ();
3078 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3080 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3081 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3082 timevar_pop (TV_FLOW);
3084 if (warn_uninitialized || extra_warnings)
3086 uninitialized_vars_warning (DECL_INITIAL (decl));
3088 setjmp_args_warning ();
3093 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3095 /* Insns were inserted, and possibly pseudos created, so
3096 things might look a bit different. */
3097 insns = get_insns ();
3098 allocate_reg_life_data ();
3099 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3100 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
3106 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3110 /* If -opt, try combining insns through substitution. */
3114 int rebuild_jump_labels_after_combine = 0;
3116 timevar_push (TV_COMBINE);
3117 open_dump_file (DFI_combine, decl);
3119 rebuild_jump_labels_after_combine
3120 = combine_instructions (insns, max_reg_num ());
3122 /* Combining insns may have turned an indirect jump into a
3123 direct jump. Rebuid the JUMP_LABEL fields of jumping
3125 if (rebuild_jump_labels_after_combine)
3127 timevar_push (TV_JUMP);
3128 rebuild_jump_labels (insns);
3129 timevar_pop (TV_JUMP);
3131 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3134 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3135 timevar_pop (TV_COMBINE);
3140 /* Rerun if-conversion, as combine may have simplified things enough to
3141 now meet sequence length restrictions. */
3142 if (flag_if_conversion)
3144 timevar_push (TV_IFCVT);
3145 open_dump_file (DFI_ce2, decl);
3151 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3152 timevar_pop (TV_IFCVT);
3155 /* Register allocation pre-pass, to reduce number of moves
3156 necessary for two-address machines. */
3157 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3159 timevar_push (TV_REGMOVE);
3160 open_dump_file (DFI_regmove, decl);
3162 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3164 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3165 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3166 timevar_pop (TV_REGMOVE);
3171 /* Do unconditional splitting before register allocation to allow machine
3172 description to add extra information not needed previously. */
3173 split_all_insns (1);
3175 /* Any of the several passes since flow1 will have munged register
3176 lifetime data a bit. */
3177 register_life_up_to_date = 0;
3179 #ifdef OPTIMIZE_MODE_SWITCHING
3180 timevar_push (TV_MODE_SWITCH);
3183 optimize_mode_switching (NULL);
3186 timevar_pop (TV_MODE_SWITCH);
3189 timevar_push (TV_SCHED);
3191 #ifdef INSN_SCHEDULING
3193 /* Print function header into sched dump now
3194 because doing the sched analysis makes some of the dump. */
3195 if (optimize > 0 && flag_schedule_insns)
3197 open_dump_file (DFI_sched, decl);
3199 /* Do control and data sched analysis,
3200 and write some of the results to dump file. */
3202 schedule_insns (rtl_dump_file);
3204 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3206 /* Register lifetime information was updated as part of verifying
3208 register_life_up_to_date = 1;
3211 timevar_pop (TV_SCHED);
3215 /* Determine if the current function is a leaf before running reload
3216 since this can impact optimizations done by the prologue and
3217 epilogue thus changing register elimination offsets. */
3218 current_function_is_leaf = leaf_function_p ();
3220 timevar_push (TV_LOCAL_ALLOC);
3221 open_dump_file (DFI_lreg, decl);
3223 /* Allocate pseudo-regs that are used only within 1 basic block.
3225 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3226 jump optimizer after register allocation and reloading are finished. */
3228 if (! register_life_up_to_date)
3229 recompute_reg_usage (insns, ! optimize_size);
3231 if (flag_new_regalloc)
3233 delete_trivially_dead_insns (insns, max_reg_num ());
3236 timevar_pop (TV_LOCAL_ALLOC);
3237 if (dump_file[DFI_lreg].enabled)
3239 timevar_push (TV_DUMP);
3241 close_dump_file (DFI_lreg, NULL, NULL);
3242 timevar_pop (TV_DUMP);
3245 /* XXX clean up the whole mess to bring live info in shape again. */
3246 timevar_push (TV_GLOBAL_ALLOC);
3247 open_dump_file (DFI_greg, decl);
3249 build_insn_chain (insns);
3250 failure = reload (insns, 0);
3252 timevar_pop (TV_GLOBAL_ALLOC);
3254 if (dump_file[DFI_greg].enabled)
3256 timevar_push (TV_DUMP);
3258 dump_global_regs (rtl_dump_file);
3260 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3261 timevar_pop (TV_DUMP);
3265 goto exit_rest_of_compilation;
3266 reload_completed = 1;
3267 rebuild_label_notes_after_reload = 0;
3271 /* Allocate the reg_renumber array. */
3272 allocate_reg_info (max_regno, FALSE, TRUE);
3274 /* And the reg_equiv_memory_loc array. */
3275 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3277 allocate_initial_values (reg_equiv_memory_loc);
3279 regclass (insns, max_reg_num (), rtl_dump_file);
3280 rebuild_label_notes_after_reload = local_alloc ();
3282 timevar_pop (TV_LOCAL_ALLOC);
3284 if (dump_file[DFI_lreg].enabled)
3286 timevar_push (TV_DUMP);
3288 dump_flow_info (rtl_dump_file);
3289 dump_local_alloc (rtl_dump_file);
3291 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3292 timevar_pop (TV_DUMP);
3297 timevar_push (TV_GLOBAL_ALLOC);
3298 open_dump_file (DFI_greg, decl);
3300 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3301 pass fixing up any insns that are invalid. */
3304 failure = global_alloc (rtl_dump_file);
3307 build_insn_chain (insns);
3308 failure = reload (insns, 0);
3311 timevar_pop (TV_GLOBAL_ALLOC);
3313 if (dump_file[DFI_greg].enabled)
3315 timevar_push (TV_DUMP);
3317 dump_global_regs (rtl_dump_file);
3319 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3320 timevar_pop (TV_DUMP);
3324 goto exit_rest_of_compilation;
3329 open_dump_file (DFI_postreload, decl);
3331 /* Do a very simple CSE pass over just the hard registers. */
3334 timevar_push (TV_RELOAD_CSE_REGS);
3335 reload_cse_regs (insns);
3336 timevar_pop (TV_RELOAD_CSE_REGS);
3339 /* Register allocation and reloading may have turned an indirect jump into
3340 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3341 jumping instructions. */
3342 if (rebuild_label_notes_after_reload)
3344 timevar_push (TV_JUMP);
3346 rebuild_jump_labels (insns);
3347 purge_all_dead_edges (0);
3349 timevar_pop (TV_JUMP);
3352 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3354 /* Re-create the death notes which were deleted during reload. */
3355 timevar_push (TV_FLOW2);
3356 open_dump_file (DFI_flow2, decl);
3358 #ifdef ENABLE_CHECKING
3359 verify_flow_info ();
3362 /* If optimizing, then go ahead and split insns now. */
3366 split_all_insns (0);
3369 cleanup_cfg (CLEANUP_EXPENSIVE);
3371 /* On some machines, the prologue and epilogue code, or parts thereof,
3372 can be represented as RTL. Doing so lets us schedule insns between
3373 it and the rest of the code and also allows delayed branch
3374 scheduling to operate in the epilogue. */
3375 thread_prologue_and_epilogue_insns (insns);
3379 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3380 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3381 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3383 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3384 even for machines with possibly nonzero RETURN_POPS_ARGS
3385 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3386 push instructions will have popping returns. */
3387 #ifndef PUSH_ROUNDING
3388 if (!ACCUMULATE_OUTGOING_ARGS)
3390 combine_stack_adjustments ();
3395 flow2_completed = 1;
3397 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3398 timevar_pop (TV_FLOW2);
3400 #ifdef HAVE_peephole2
3401 if (optimize > 0 && flag_peephole2)
3403 timevar_push (TV_PEEPHOLE2);
3404 open_dump_file (DFI_peephole2, decl);
3406 peephole2_optimize (rtl_dump_file);
3408 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3409 timevar_pop (TV_PEEPHOLE2);
3413 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3415 timevar_push (TV_RENAME_REGISTERS);
3416 open_dump_file (DFI_rnreg, decl);
3418 if (flag_rename_registers)
3419 regrename_optimize ();
3420 if (flag_cprop_registers)
3421 copyprop_hardreg_forward ();
3423 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3424 timevar_pop (TV_RENAME_REGISTERS);
3427 if (flag_if_conversion2)
3429 timevar_push (TV_IFCVT2);
3430 open_dump_file (DFI_ce3, decl);
3434 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3435 timevar_pop (TV_IFCVT2);
3438 #ifdef INSN_SCHEDULING
3439 if (optimize > 0 && flag_schedule_insns_after_reload)
3441 timevar_push (TV_SCHED2);
3442 open_dump_file (DFI_sched2, decl);
3444 /* Do control and data sched analysis again,
3445 and write some more of the results to dump file. */
3447 split_all_insns (1);
3449 schedule_insns (rtl_dump_file);
3451 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3452 timevar_pop (TV_SCHED2);
3458 #ifdef LEAF_REGISTERS
3459 current_function_uses_only_leaf_regs
3460 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3464 timevar_push (TV_REG_STACK);
3465 open_dump_file (DFI_stack, decl);
3467 reg_to_stack (insns, rtl_dump_file);
3469 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3470 timevar_pop (TV_REG_STACK);
3476 timevar_push (TV_REORDER_BLOCKS);
3477 open_dump_file (DFI_bbro, decl);
3479 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3480 splitting possibly introduced more crossjumping oppurtuntities.
3481 Except that we can't actually run crossjumping without running
3482 another DCE pass, which we can't do after reg-stack. */
3483 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3484 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3485 if (flag_reorder_blocks)
3487 reorder_basic_blocks ();
3488 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3491 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3492 timevar_pop (TV_REORDER_BLOCKS);
3494 compute_alignments ();
3496 /* CFG is no longer maintained up-to-date. */
3497 free_bb_for_insn ();
3499 /* If a machine dependent reorganization is needed, call it. */
3500 #ifdef MACHINE_DEPENDENT_REORG
3501 timevar_push (TV_MACH_DEP);
3502 open_dump_file (DFI_mach, decl);
3504 MACHINE_DEPENDENT_REORG (insns);
3506 close_dump_file (DFI_mach, print_rtl, insns);
3507 timevar_pop (TV_MACH_DEP);
3512 purge_line_number_notes (insns);
3513 cleanup_barriers ();
3515 /* If a scheduling pass for delayed branches is to be done,
3516 call the scheduling code. */
3519 if (optimize > 0 && flag_delayed_branch)
3521 timevar_push (TV_DBR_SCHED);
3522 open_dump_file (DFI_dbr, decl);
3524 dbr_schedule (insns, rtl_dump_file);
3526 close_dump_file (DFI_dbr, print_rtl, insns);
3527 timevar_pop (TV_DBR_SCHED);
3533 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3534 timevar_push (TV_SHORTEN_BRANCH);
3535 split_all_insns_noflow ();
3536 timevar_pop (TV_SHORTEN_BRANCH);
3539 convert_to_eh_region_ranges ();
3541 /* Shorten branches. */
3542 timevar_push (TV_SHORTEN_BRANCH);
3543 shorten_branches (get_insns ());
3544 timevar_pop (TV_SHORTEN_BRANCH);
3546 set_nothrow_function_flags ();
3547 if (current_function_nothrow)
3548 /* Now we know that this can't throw; set the flag for the benefit
3549 of other functions later in this translation unit. */
3550 TREE_NOTHROW (current_function_decl) = 1;
3552 /* Now turn the rtl into assembler code. */
3554 timevar_push (TV_FINAL);
3559 /* Get the function's name, as described by its RTL. This may be
3560 different from the DECL_NAME name used in the source file. */
3562 x = DECL_RTL (decl);
3563 if (GET_CODE (x) != MEM)
3566 if (GET_CODE (x) != SYMBOL_REF)
3568 fnname = XSTR (x, 0);
3570 assemble_start_function (decl, fnname);
3571 final_start_function (insns, asm_out_file, optimize);
3572 final (insns, asm_out_file, optimize, 0);
3573 final_end_function ();
3575 #ifdef IA64_UNWIND_INFO
3576 /* ??? The IA-64 ".handlerdata" directive must be issued before
3577 the ".endp" directive that closes the procedure descriptor. */
3578 output_function_exception_table ();
3581 assemble_end_function (decl, fnname);
3583 #ifndef IA64_UNWIND_INFO
3584 /* Otherwise, it feels unclean to switch sections in the middle. */
3585 output_function_exception_table ();
3589 fflush (asm_out_file);
3591 /* Release all memory allocated by flow. */
3592 free_basic_block_vars (0);
3594 /* Release all memory held by regsets now. */
3595 regset_release_memory ();
3597 timevar_pop (TV_FINAL);
3601 /* Write DBX symbols if requested. */
3603 /* Note that for those inline functions where we don't initially
3604 know for certain that we will be generating an out-of-line copy,
3605 the first invocation of this routine (rest_of_compilation) will
3606 skip over this code by doing a `goto exit_rest_of_compilation;'.
3607 Later on, wrapup_global_declarations will (indirectly) call
3608 rest_of_compilation again for those inline functions that need
3609 to have out-of-line copies generated. During that call, we
3610 *will* be routed past here. */
3612 timevar_push (TV_SYMOUT);
3613 (*debug_hooks->function_decl) (decl);
3614 timevar_pop (TV_SYMOUT);
3616 exit_rest_of_compilation:
3618 /* In case the function was not output,
3619 don't leave any temporary anonymous types
3620 queued up for sdb output. */
3621 #ifdef SDB_DEBUGGING_INFO
3622 if (write_symbols == SDB_DEBUG)
3623 sdbout_types (NULL_TREE);
3626 reload_completed = 0;
3627 flow2_completed = 0;
3630 timevar_push (TV_FINAL);
3632 /* Clear out the insn_length contents now that they are no
3634 init_insn_lengths ();
3636 /* Show no temporary slots allocated. */
3639 free_basic_block_vars (0);
3640 free_bb_for_insn ();
3642 timevar_pop (TV_FINAL);
3644 /* Make sure volatile mem refs aren't considered valid operands for
3645 arithmetic insns. We must call this here if this is a nested inline
3646 function, since the above code leaves us in the init_recog state
3647 (from final.c), and the function context push/pop code does not
3648 save/restore volatile_ok.
3650 ??? Maybe it isn't necessary for expand_start_function to call this
3651 anymore if we do it here? */
3653 init_recog_no_volatile ();
3655 /* We're done with this function. Free up memory if we can. */
3656 free_after_parsing (cfun);
3657 if (! DECL_DEFER_OUTPUT (decl))
3659 free_after_compilation (cfun);
3661 /* Clear integrate.c's pointer to the cfun structure we just
3663 DECL_SAVED_INSNS (decl) = 0;
3669 timevar_pop (TV_REST_OF_COMPILATION);
3679 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3680 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3681 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3682 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3683 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3684 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"));
3685 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3686 printf (_(" -fstack-limit-register=<register> Trap if the stack goes past <register>\n"));
3687 printf (_(" -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>\n"));
3688 printf (_(" -frandom-seed=<string> Make compile reproducible using <string>\n"));
3691 for (i = ARRAY_SIZE (f_options); i--;)
3693 const char *description = f_options[i].description;
3695 if (description != NULL && *description != 0)
3696 printf (" -f%-21s %s\n",
3697 f_options[i].string, _(description));
3700 printf (_(" -O[number] Set optimization level to [number]\n"));
3701 printf (_(" -Os Optimize for space rather than speed\n"));
3702 for (i = LAST_PARAM; i--;)
3704 const char *description = compiler_params[i].help;
3705 const int length = 21 - strlen (compiler_params[i].option);
3707 if (description != NULL && *description != 0)
3708 printf (" --param %s=<value>%.*s%s\n",
3709 compiler_params[i].option,
3710 length > 0 ? length : 1, " ",
3713 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3714 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3715 printf (_(" -w Suppress warnings\n"));
3716 printf (_(" -W Enable extra warnings\n"));
3718 for (i = ARRAY_SIZE (W_options); i--;)
3720 const char *description = W_options[i].description;
3722 if (description != NULL && *description != 0)
3723 printf (" -W%-21s %s\n",
3724 W_options[i].string, _(description));
3727 printf (_(" -Wunused Enable unused warnings\n"));
3728 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3729 printf (_(" -p Enable function profiling\n"));
3730 printf (_(" -o <file> Place output into <file> \n"));
3732 -G <number> Put global and static data smaller than <number>\n\
3733 bytes into a special section (on some targets)\n"));
3735 for (i = ARRAY_SIZE (debug_args); i--;)
3737 if (debug_args[i].description != NULL)
3738 printf (" -g%-21s %s\n",
3739 debug_args[i].arg, _(debug_args[i].description));
3742 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3743 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3744 printf (_(" -version Display the compiler's version\n"));
3745 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3746 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3747 #if defined INSN_SCHEDULING
3748 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3750 printf (_(" --help Display this information\n"));
3755 /* Display descriptions of language specific options.
3756 If there is no description, note that there is an undocumented option.
3757 If the description is empty, do not display anything. (This allows
3758 options to be deliberately undocumented, for whatever reason).
3759 If the option string is missing, then this is a marker, indicating
3760 that the description string is in fact the name of a language, whose
3761 language specific options are to follow. */
3763 if (ARRAY_SIZE (documented_lang_options) > 1)
3765 printf (_("\nLanguage specific options:\n"));
3767 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3769 const char *description = documented_lang_options[i].description;
3770 const char *option = documented_lang_options[i].option;
3772 if (description == NULL)
3777 printf (_(" %-23.23s [undocumented]\n"), option);
3779 else if (*description == 0)
3781 else if (option == NULL)
3785 (_("\nThere are undocumented %s specific options as well.\n"),
3789 printf (_("\n Options for %s:\n"), description);
3794 printf (" %-23.23s %s\n", option, _(description));
3799 printf (_("\nThere are undocumented %s specific options as well.\n"),
3802 display_target_options ();
3806 display_target_options ()
3809 static bool displayed = false;
3811 /* Avoid double printing for --help --target-help. */
3816 if (ARRAY_SIZE (target_switches) > 1
3817 #ifdef TARGET_OPTIONS
3818 || ARRAY_SIZE (target_options) > 1
3826 printf (_("\nTarget specific options:\n"));
3828 for (i = ARRAY_SIZE (target_switches); i--;)
3830 const char *option = target_switches[i].name;
3831 const char *description = target_switches[i].description;
3833 if (option == NULL || *option == 0)
3835 else if (description == NULL)
3840 printf (_(" -m%-23.23s [undocumented]\n"), option);
3842 else if (*description != 0)
3843 doc += printf (" -m%-23.23s %s\n", option, _(description));
3846 #ifdef TARGET_OPTIONS
3847 for (i = ARRAY_SIZE (target_options); i--;)
3849 const char *option = target_options[i].prefix;
3850 const char *description = target_options[i].description;
3852 if (option == NULL || *option == 0)
3854 else if (description == NULL)
3859 printf (_(" -m%-23.23s [undocumented]\n"), option);
3861 else if (*description != 0)
3862 doc += printf (" -m%-23.23s %s\n", option, _(description));
3868 printf (_("\nThere are undocumented target specific options as well.\n"));
3870 printf (_(" They exist, but they are not documented.\n"));
3875 /* Parse a -d... command line switch. */
3878 decode_d_option (arg)
3887 for (i = 0; i < (int) DFI_MAX; ++i)
3888 dump_file[i].enabled = 1;
3894 flag_print_asm_name = 1;
3897 flag_dump_rtl_in_asm = 1;
3898 flag_print_asm_name = 1;
3901 graph_dump_format = vcg;
3904 rtl_dump_and_exit = 1;
3909 case 'D': /* These are handled by the preprocessor. */
3915 for (i = 0; i < (int) DFI_MAX; ++i)
3916 if (c == dump_file[i].debug_switch)
3918 dump_file[i].enabled = 1;
3923 warning ("unrecognized gcc debugging option: %c", c);
3928 /* Parse a -f... command line switch. ARG is the value after the -f.
3929 It is safe to access 'ARG - 2' to generate the full switch name.
3930 Return the number of strings consumed. */
3933 decode_f_option (arg)
3937 const char *option_value = NULL;
3939 /* Search for the option in the table of binary f options. */
3940 for (j = ARRAY_SIZE (f_options); j--;)
3942 if (!strcmp (arg, f_options[j].string))
3944 *f_options[j].variable = f_options[j].on_value;
3948 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3949 && ! strcmp (arg + 3, f_options[j].string))
3951 *f_options[j].variable = ! f_options[j].on_value;
3956 if (!strcmp (arg, "fast-math"))
3957 set_fast_math_flags (1);
3958 else if (!strcmp (arg, "no-fast-math"))
3959 set_fast_math_flags (0);
3960 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3961 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3964 read_integral_parameter (option_value, arg - 2,
3966 set_param_value ("max-inline-insns", val);
3967 set_param_value ("max-inline-insns-single", val/2);
3968 set_param_value ("max-inline-insns-auto", val/2);
3969 set_param_value ("max-inline-insns-rtl", val);
3970 if (val/4 < MIN_INLINE_INSNS)
3973 set_param_value ("min-inline-insns", val/4);
3975 set_param_value ("min-inline-insns", 10);
3978 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
3980 if (strcmp (option_value, "global-dynamic") == 0)
3981 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
3982 else if (strcmp (option_value, "local-dynamic") == 0)
3983 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
3984 else if (strcmp (option_value, "initial-exec") == 0)
3985 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
3986 else if (strcmp (option_value, "local-exec") == 0)
3987 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
3989 warning ("`%s': unknown tls-model option", arg - 2);
3991 #ifdef INSN_SCHEDULING
3992 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3993 fix_sched_param ("verbose", option_value);
3995 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3996 fix_register (option_value, 1, 1);
3997 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3998 fix_register (option_value, 0, 1);
3999 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4000 fix_register (option_value, 0, 0);
4001 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4002 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4003 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4005 = read_integral_parameter (option_value, arg - 2, align_functions);
4006 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4007 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4008 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4010 = read_integral_parameter (option_value, arg - 2, align_labels);
4011 else if ((option_value
4012 = skip_leading_substring (arg, "stack-limit-register=")))
4014 int reg = decode_reg_name (option_value);
4016 error ("unrecognized register name `%s'", option_value);
4018 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4020 else if ((option_value
4021 = skip_leading_substring (arg, "stack-limit-symbol=")))
4024 nm = ggc_strdup (option_value);
4025 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4027 else if ((option_value
4028 = skip_leading_substring (arg, "message-length=")))
4029 output_set_maximum_length
4030 (&global_dc->buffer, read_integral_parameter
4031 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4032 else if ((option_value
4033 = skip_leading_substring (arg, "diagnostics-show-location=")))
4035 if (!strcmp (option_value, "once"))
4036 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4037 else if (!strcmp (option_value, "every-line"))
4038 diagnostic_prefixing_rule (global_dc)
4039 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4041 error ("unrecognized option `%s'", arg - 2);
4043 else if (!strcmp (arg, "no-stack-limit"))
4044 stack_limit_rtx = NULL_RTX;
4045 else if ((option_value = skip_leading_substring (arg, "random-seed=")))
4046 flag_random_seed = option_value;
4047 else if (!strcmp (arg, "no-random-seed"))
4048 flag_random_seed = NULL;
4049 else if (!strcmp (arg, "preprocessed"))
4050 /* Recognize this switch but do nothing. This prevents warnings
4051 about an unrecognized switch if cpplib has not been linked in. */
4059 /* Parse a -W... command line switch. ARG is the value after the -W.
4060 It is safe to access 'ARG - 2' to generate the full switch name.
4061 Return the number of strings consumed. */
4064 decode_W_option (arg)
4067 const char *option_value = NULL;
4070 /* Search for the option in the table of binary W options. */
4072 for (j = ARRAY_SIZE (W_options); j--;)
4074 if (!strcmp (arg, W_options[j].string))
4076 *W_options[j].variable = W_options[j].on_value;
4080 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4081 && ! strcmp (arg + 3, W_options[j].string))
4083 *W_options[j].variable = ! W_options[j].on_value;
4088 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4089 warning ("-Wid-clash-LEN is no longer supported");
4090 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4092 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4094 warn_larger_than = larger_than_size != -1;
4096 else if (!strcmp (arg, "unused"))
4100 else if (!strcmp (arg, "no-unused"))
4110 /* Parse a -g... command line switch. ARG is the value after the -g.
4111 It is safe to access 'ARG - 2' to generate the full switch name.
4112 Return the number of strings consumed. */
4115 decode_g_option (arg)
4118 static unsigned level = 0;
4119 /* A lot of code assumes write_symbols == NO_DEBUG if the
4120 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4121 of what debugging type has been selected). This records the
4122 selected type. It is an error to specify more than one
4124 static enum debug_info_type selected_debug_type = NO_DEBUG;
4125 /* Non-zero if debugging format has been explicitly set.
4126 -g and -ggdb don't explicitly set the debugging format so
4127 -gdwarf -g3 is equivalent to -gdwarf3. */
4128 static int type_explicitly_set_p = 0;
4129 /* Indexed by enum debug_info_type. */
4130 static const char *const debug_type_names[] =
4132 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4135 /* The maximum admissible debug level value. */
4136 static const unsigned max_debug_level = 3;
4138 /* Look up ARG in the table. */
4139 for (da = debug_args; da->arg; da++)
4141 const int da_len = strlen (da->arg);
4143 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4145 enum debug_info_type type = da->debug_type;
4146 const char *p = arg + da_len;
4148 if (*p && ! ISDIGIT (*p))
4151 /* A debug flag without a level defaults to level 2.
4152 Note we do not want to call read_integral_parameter
4153 for that case since it will call atoi which
4156 ??? We may want to generalize the interface to
4157 read_integral_parameter to better handle this case
4158 if this case shows up often. */
4160 level = read_integral_parameter (p, 0, max_debug_level + 1);
4162 level = (level == 0) ? 2 : level;
4164 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4166 error ("use -gdwarf -g%d for DWARF v1, level %d",
4169 error ("use -gdwarf-2 for DWARF v2");
4172 if (level > max_debug_level)
4175 ignoring option `%s' due to invalid debug level specification",
4177 level = debug_info_level;
4180 if (type == NO_DEBUG)
4182 type = PREFERRED_DEBUGGING_TYPE;
4184 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4186 #ifdef DWARF2_DEBUGGING_INFO
4187 type = DWARF2_DEBUG;
4189 #ifdef DBX_DEBUGGING_INFO
4196 if (type == NO_DEBUG)
4197 warning ("`%s': unknown or unsupported -g option", arg - 2);
4199 /* Does it conflict with an already selected type? */
4200 if (type_explicitly_set_p
4201 /* -g/-ggdb don't conflict with anything. */
4202 && da->debug_type != NO_DEBUG
4203 && type != selected_debug_type)
4204 warning ("`%s' ignored, conflicts with `-g%s'",
4205 arg - 2, debug_type_names[(int) selected_debug_type]);
4208 /* If the format has already been set, -g/-ggdb
4209 only change the debug level. */
4210 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4211 /* Don't change debugging type. */
4215 selected_debug_type = type;
4216 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4219 write_symbols = (level == 0
4221 : selected_debug_type);
4222 use_gnu_debug_info_extensions = da->use_extensions_p;
4223 debug_info_level = (enum debug_info_level) level;
4236 /* Decode the first argument in the argv as a language-independent option.
4237 Return the number of strings consumed. */
4240 independent_decode_option (argc, argv)
4244 char *arg = argv[0];
4246 if (arg[0] != '-' || arg[1] == 0)
4258 if (!strcmp (arg, "-help"))
4261 exit_after_options = 1;
4265 if (!strcmp (arg, "-target-help"))
4267 display_target_options ();
4268 exit_after_options = 1;
4272 if (!strcmp (arg, "-version"))
4274 print_version (stderr, "");
4275 exit_after_options = 1;
4279 /* Handle '--param <name>=<value>'. */
4280 if (strcmp (arg, "-param") == 0)
4286 error ("-param option missing argument");
4290 /* Get the '<name>=<value>' parameter. */
4292 /* Look for the `='. */
4293 equal = strchr (arg, '=');
4295 error ("invalid --param option: %s", arg);
4300 /* Zero out the `=' sign so that we get two separate strings. */
4302 /* Figure out what value is specified. */
4303 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4304 if (val != INVALID_PARAM_VAL)
4305 set_param_value (arg, val);
4307 error ("invalid parameter value `%s'", equal + 1);
4322 /* Already been treated in main (). Do nothing. */
4326 set_target_switch (arg + 1);
4330 return decode_f_option (arg + 1);
4333 return decode_g_option (arg + 1);
4336 if (!strcmp (arg, "dumpbase"))
4342 dump_base_name = argv[1];
4347 decode_d_option (arg + 1);
4351 if (!strcmp (arg, "pedantic"))
4353 else if (!strcmp (arg, "pedantic-errors"))
4354 flag_pedantic_errors = pedantic = 1;
4355 else if (arg[1] == 0)
4362 if (!strcmp (arg, "quiet"))
4369 if (!strcmp (arg, "version"))
4377 inhibit_warnings = 1;
4386 /* We save the value of warn_uninitialized, since if they put
4387 -Wuninitialized on the command line, we need to generate a
4388 warning about not using it without also specifying -O. */
4389 if (warn_uninitialized != 1)
4390 warn_uninitialized = 2;
4393 return decode_W_option (arg + 1);
4397 if (!strncmp (arg, "aux-info", 8))
4404 aux_info_file_name = argv[1];
4405 flag_gen_aux_info = 1;
4408 else if (arg[8] == '=')
4410 aux_info_file_name = arg + 9;
4411 flag_gen_aux_info = 1;
4416 else if (!strcmp (arg, "auxbase"))
4422 aux_base_name = argv[1];
4426 else if (!strcmp (arg, "auxbase-strip"))
4433 strip_off_ending (argv[1], strlen (argv[1]));
4435 aux_base_name = argv[1];
4450 asm_file_name = argv[1];
4465 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4470 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4474 if (g_switch_val == -1)
4478 g_switch_set = TRUE;
4479 g_switch_value = g_switch_val;
4489 /* Decode -m switches. */
4490 /* Decode the switch -mNAME. */
4493 set_target_switch (name)
4497 int valid_target_option = 0;
4499 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4500 if (!strcmp (target_switches[j].name, name))
4502 if (target_switches[j].value < 0)
4503 target_flags &= ~-target_switches[j].value;
4505 target_flags |= target_switches[j].value;
4508 if (target_switches[j].value < 0)
4509 target_flags_explicit |= -target_switches[j].value;
4511 target_flags_explicit |= target_switches[j].value;
4513 valid_target_option = 1;
4516 #ifdef TARGET_OPTIONS
4517 if (!valid_target_option)
4518 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4520 int len = strlen (target_options[j].prefix);
4521 if (!strncmp (target_options[j].prefix, name, len))
4523 *target_options[j].variable = name + len;
4524 valid_target_option = 1;
4529 if (!valid_target_option)
4530 error ("invalid option `%s'", name);
4533 /* Print version information to FILE.
4534 Each line begins with INDENT (for the case where FILE is the
4535 assembler output file). */
4538 print_version (file, indent)
4543 #define __VERSION__ "[?]"
4547 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4549 "%s%s%s version %s (%s) compiled by CC.\n"
4551 , indent, *indent != 0 ? " " : "",
4552 lang_hooks.name, version_string, TARGET_NAME,
4553 indent, __VERSION__);
4554 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4555 indent, *indent != 0 ? " " : "",
4556 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4559 /* Print an option value and return the adjusted position in the line.
4560 ??? We don't handle error returns from fprintf (disk full); presumably
4561 other code will catch a disk full though. */
4564 print_single_switch (file, pos, max, indent, sep, term, type, name)
4567 const char *indent, *sep, *term, *type, *name;
4569 /* The ultrix fprintf returns 0 on success, so compute the result we want
4570 here since we need it for the following test. */
4571 int len = strlen (sep) + strlen (type) + strlen (name);
4576 fprintf (file, "%s", term);
4581 fprintf (file, "%s", indent);
4582 pos = strlen (indent);
4584 fprintf (file, "%s%s%s", sep, type, name);
4589 /* Print active target switches to FILE.
4590 POS is the current cursor position and MAX is the size of a "line".
4591 Each line begins with INDENT and ends with TERM.
4592 Each switch is separated from the next by SEP. */
4595 print_switch_values (file, pos, max, indent, sep, term)
4598 const char *indent, *sep, *term;
4603 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4604 that it can be printed below. This helps reproducibility. Of
4605 course, the string may never be used, but we can't tell that at
4606 this point in the compile. */
4607 default_flag_random_seed ();
4609 /* Print the options as passed. */
4611 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4612 _("options passed: "), "");
4614 for (p = &save_argv[1]; *p != NULL; p++)
4618 if (strcmp (*p, "-o") == 0)
4624 if (strcmp (*p, "-quiet") == 0)
4626 if (strcmp (*p, "-version") == 0)
4631 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4634 fprintf (file, "%s", term);
4636 /* Print the -f and -m options that have been enabled.
4637 We don't handle language specific options but printing argv
4640 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4641 _("options enabled: "), "");
4643 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4644 if (*f_options[j].variable == f_options[j].on_value)
4645 pos = print_single_switch (file, pos, max, indent, sep, term,
4646 "-f", f_options[j].string);
4648 /* Print target specific options. */
4650 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4651 if (target_switches[j].name[0] != '\0'
4652 && target_switches[j].value > 0
4653 && ((target_switches[j].value & target_flags)
4654 == target_switches[j].value))
4656 pos = print_single_switch (file, pos, max, indent, sep, term,
4657 "-m", target_switches[j].name);
4660 #ifdef TARGET_OPTIONS
4661 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4662 if (*target_options[j].variable != NULL)
4665 sprintf (prefix, "-m%s", target_options[j].prefix);
4666 pos = print_single_switch (file, pos, max, indent, sep, term,
4667 prefix, *target_options[j].variable);
4671 fprintf (file, "%s", term);
4674 /* Open assembly code output file. Do this even if -fsyntax-only is
4675 on, because then the driver will have provided the name of a
4676 temporary file or bit bucket for us. NAME is the file specified on
4677 the command line, possibly NULL. */
4679 init_asm_output (name)
4682 if (name == NULL && asm_file_name == 0)
4683 asm_out_file = stdout;
4686 if (asm_file_name == 0)
4688 int len = strlen (dump_base_name);
4689 char *dumpname = (char *) xmalloc (len + 6);
4690 memcpy (dumpname, dump_base_name, len + 1);
4691 strip_off_ending (dumpname, len);
4692 strcat (dumpname, ".s");
4693 asm_file_name = dumpname;
4695 if (!strcmp (asm_file_name, "-"))
4696 asm_out_file = stdout;
4698 asm_out_file = fopen (asm_file_name, "w");
4699 if (asm_out_file == 0)
4700 fatal_io_error ("can't open %s for writing", asm_file_name);
4703 #ifdef IO_BUFFER_SIZE
4704 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4705 _IOFBF, IO_BUFFER_SIZE);
4708 if (!flag_syntax_only)
4710 #ifdef ASM_FILE_START
4711 ASM_FILE_START (asm_out_file);
4714 #ifdef ASM_COMMENT_START
4715 if (flag_verbose_asm)
4717 /* Print the list of options in effect. */
4718 print_version (asm_out_file, ASM_COMMENT_START);
4719 print_switch_values (asm_out_file, 0, MAX_LINE,
4720 ASM_COMMENT_START, " ", "\n");
4721 /* Add a blank line here so it appears in assembler output but not
4723 fprintf (asm_out_file, "\n");
4729 /* Initialization of the front end environment, before command line
4730 options are parsed. Signal handlers, internationalization etc.
4731 ARGV0 is main's argv[0]. */
4733 general_init (argv0)
4738 p = argv0 + strlen (argv0);
4739 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4743 xmalloc_set_program_name (progname);
4747 gcc_init_libintl ();
4749 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4751 signal (SIGSEGV, crash_signal);
4754 signal (SIGILL, crash_signal);
4757 signal (SIGBUS, crash_signal);
4760 signal (SIGABRT, crash_signal);
4762 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4763 signal (SIGIOT, crash_signal);
4766 signal (SIGFPE, crash_signal);
4769 /* Initialize the diagnostics reporting machinery, so option parsing
4770 can give warnings and errors. */
4771 diagnostic_initialize (global_dc);
4773 /* Initialize the garbage-collector, string pools and tree type hash
4780 /* Parse command line options and set default flag values, called
4781 after language-independent option-independent initialization. Do
4782 minimal options processing. Outputting diagnostics is OK, but GC
4783 and identifier hashtables etc. are not initialized yet.
4785 Return nonzero to suppress compiler back end initialization. */
4787 parse_options_and_default_flags (argc, argv)
4793 /* Save in case md file wants to emit args as a comment. */
4797 /* Initialize register usage now so switches may override. */
4800 /* Register the language-independent parameters. */
4801 add_params (lang_independent_params, LAST_PARAM);
4803 /* This must be done after add_params but before argument processing. */
4804 init_ggc_heuristics();
4806 /* Perform language-specific options initialization. */
4807 (*lang_hooks.init_options) ();
4809 /* Scan to see what optimization level has been specified. That will
4810 determine the default value of many flags. */
4811 for (i = 1; i < argc; i++)
4813 if (!strcmp (argv[i], "-O"))
4818 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4820 /* Handle -Os, -O2, -O3, -O69, ... */
4821 char *p = &argv[i][2];
4823 if ((p[0] == 's') && (p[1] == 0))
4827 /* Optimizing for size forces optimize to be 2. */
4832 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4833 if (optimize_val != -1)
4835 optimize = optimize_val;
4844 flag_merge_constants = 0;
4850 flag_thread_jumps = 1;
4852 flag_delayed_branch = 1;
4854 #ifdef CAN_DEBUG_WITHOUT_FP
4855 flag_omit_frame_pointer = 1;
4857 flag_guess_branch_prob = 1;
4858 flag_cprop_registers = 1;
4859 flag_loop_optimize = 1;
4860 flag_crossjumping = 1;
4861 flag_if_conversion = 1;
4862 flag_if_conversion2 = 1;
4867 flag_optimize_sibling_calls = 1;
4868 flag_cse_follow_jumps = 1;
4869 flag_cse_skip_blocks = 1;
4871 flag_expensive_optimizations = 1;
4872 flag_strength_reduce = 1;
4873 flag_rerun_cse_after_loop = 1;
4874 flag_rerun_loop_opt = 1;
4875 flag_caller_saves = 1;
4878 #ifdef INSN_SCHEDULING
4879 flag_schedule_insns = 1;
4880 flag_schedule_insns_after_reload = 1;
4883 flag_strict_aliasing = 1;
4884 flag_delete_null_pointer_checks = 1;
4885 flag_reorder_blocks = 1;
4886 flag_reorder_functions = 1;
4891 flag_inline_functions = 1;
4892 flag_rename_registers = 1;
4895 if (optimize < 2 || optimize_size)
4900 align_functions = 1;
4902 /* Don't reorder blocks when optimizing for size because extra
4903 jump insns may be created; also barrier may create extra padding.
4905 More correctly we should have a block reordering mode that tried
4906 to minimize the combined size of all the jumps. This would more
4907 or less automatically remove extra jumps, but would also try to
4908 use more short jumps instead of long jumps. */
4909 flag_reorder_blocks = 0;
4912 /* Initialize whether `char' is signed. */
4913 flag_signed_char = DEFAULT_SIGNED_CHAR;
4914 #ifdef DEFAULT_SHORT_ENUMS
4915 /* Initialize how much space enums occupy, by default. */
4916 flag_short_enums = DEFAULT_SHORT_ENUMS;
4919 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4922 set_target_switch ("");
4924 /* Unwind tables are always present in an ABI-conformant IA-64
4925 object file, so the default should be ON. */
4926 #ifdef IA64_UNWIND_INFO
4927 flag_unwind_tables = IA64_UNWIND_INFO;
4930 #ifdef OPTIMIZATION_OPTIONS
4931 /* Allow default optimizations to be specified on a per-machine basis. */
4932 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4935 /* Perform normal command line switch decoding. */
4936 for (i = 1; i < argc;)
4939 int indep_processed;
4941 /* Give the language a chance to decode the option for itself. */
4942 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4944 if (lang_processed >= 0)
4945 /* Now see if the option also has a language independent meaning.
4946 Some options are both language specific and language independent,
4948 indep_processed = independent_decode_option (argc - i, argv + i);
4951 lang_processed = -lang_processed;
4952 indep_processed = 0;
4955 if (lang_processed || indep_processed)
4956 i += MAX (lang_processed, indep_processed);
4959 const char *option = NULL;
4960 const char *lang = NULL;
4963 /* It is possible that the command line switch is not valid for the
4964 current language, but it is valid for another language. In order
4965 to be compatible with previous versions of the compiler (which
4966 did not issue an error message in this case) we check for this
4967 possibility here. If we do find a match, then if extra_warnings
4968 is set we generate a warning message, otherwise we will just
4969 ignore the option. */
4970 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4972 option = documented_lang_options[j].option;
4975 lang = documented_lang_options[j].description;
4976 else if (! strncmp (argv[i], option, strlen (option)))
4980 if (j != ARRAY_SIZE (documented_lang_options))
4984 warning ("ignoring command line option '%s'", argv[i]);
4987 ("(it is valid for %s but not the selected language)",
4991 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4992 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4994 error ("unrecognized option `%s'", argv[i]);
5000 if (flag_no_inline == 2)
5003 flag_really_no_inline = flag_no_inline;
5005 /* Set flag_no_inline before the post_options () hook. The C front
5006 ends use it to determine tree inlining defaults. FIXME: such
5007 code should be lang-independent when all front ends use tree
5008 inlining, in which case it, and this condition, should be moved
5009 to the top of process_options() instead. */
5012 /* Inlining does not work if not optimizing,
5013 so force it not to be done. */
5017 /* The c_decode_option function and decode_option hook set
5018 this to `2' if -Wall is used, so we can avoid giving out
5019 lots of errors for people who don't realize what -Wall does. */
5020 if (warn_uninitialized == 1)
5021 warning ("-Wuninitialized is not supported without -O");
5024 if (flag_really_no_inline == 2)
5025 flag_really_no_inline = flag_no_inline;
5028 /* Process the options that have been parsed. */
5032 #ifdef OVERRIDE_OPTIONS
5033 /* Some machines may reject certain combinations of options. */
5037 /* Set up the align_*_log variables, defaulting them to 1 if they
5038 were still unset. */
5039 if (align_loops <= 0) align_loops = 1;
5040 if (align_loops_max_skip > align_loops || !align_loops)
5041 align_loops_max_skip = align_loops - 1;
5042 align_loops_log = floor_log2 (align_loops * 2 - 1);
5043 if (align_jumps <= 0) align_jumps = 1;
5044 if (align_jumps_max_skip > align_jumps || !align_jumps)
5045 align_jumps_max_skip = align_jumps - 1;
5046 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5047 if (align_labels <= 0) align_labels = 1;
5048 align_labels_log = floor_log2 (align_labels * 2 - 1);
5049 if (align_labels_max_skip > align_labels || !align_labels)
5050 align_labels_max_skip = align_labels - 1;
5051 if (align_functions <= 0) align_functions = 1;
5052 align_functions_log = floor_log2 (align_functions * 2 - 1);
5054 /* Unrolling all loops implies that standard loop unrolling must also
5056 if (flag_unroll_all_loops)
5057 flag_unroll_loops = 1;
5058 /* Loop unrolling requires that strength_reduction be on also. Silently
5059 turn on strength reduction here if it isn't already on. Also, the loop
5060 unrolling code assumes that cse will be run after loop, so that must
5061 be turned on also. */
5062 if (flag_unroll_loops)
5064 flag_strength_reduce = 1;
5065 flag_rerun_cse_after_loop = 1;
5068 if (flag_non_call_exceptions)
5069 flag_asynchronous_unwind_tables = 1;
5070 if (flag_asynchronous_unwind_tables)
5071 flag_unwind_tables = 1;
5073 /* Warn about options that are not supported on this machine. */
5074 #ifndef INSN_SCHEDULING
5075 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5076 warning ("instruction scheduling not supported on this target machine");
5079 if (flag_delayed_branch)
5080 warning ("this target machine does not have delayed branches");
5083 user_label_prefix = USER_LABEL_PREFIX;
5084 if (flag_leading_underscore != -1)
5086 /* If the default prefix is more complicated than "" or "_",
5087 issue a warning and ignore this option. */
5088 if (user_label_prefix[0] == 0 ||
5089 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5091 user_label_prefix = flag_leading_underscore ? "_" : "";
5094 warning ("-f%sleading-underscore not supported on this target machine",
5095 flag_leading_underscore ? "" : "no-");
5098 /* If we are in verbose mode, write out the version and maybe all the
5099 option flags in use. */
5102 print_version (stderr, "");
5104 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5107 if (! quiet_flag || flag_detailed_statistics)
5110 if (flag_syntax_only)
5112 write_symbols = NO_DEBUG;
5116 /* Now we know write_symbols, set up the debug hooks based on it.
5117 By default we do nothing for debug output. */
5118 #if defined(DBX_DEBUGGING_INFO)
5119 if (write_symbols == DBX_DEBUG)
5120 debug_hooks = &dbx_debug_hooks;
5122 #if defined(XCOFF_DEBUGGING_INFO)
5123 if (write_symbols == XCOFF_DEBUG)
5124 debug_hooks = &xcoff_debug_hooks;
5126 #ifdef SDB_DEBUGGING_INFO
5127 if (write_symbols == SDB_DEBUG)
5128 debug_hooks = &sdb_debug_hooks;
5130 #ifdef DWARF_DEBUGGING_INFO
5131 if (write_symbols == DWARF_DEBUG)
5132 debug_hooks = &dwarf_debug_hooks;
5134 #ifdef DWARF2_DEBUGGING_INFO
5135 if (write_symbols == DWARF2_DEBUG)
5136 debug_hooks = &dwarf2_debug_hooks;
5138 #ifdef VMS_DEBUGGING_INFO
5139 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5140 debug_hooks = &vmsdbg_debug_hooks;
5143 /* If auxiliary info generation is desired, open the output file.
5144 This goes in the same directory as the source file--unlike
5145 all the other output files. */
5146 if (flag_gen_aux_info)
5148 aux_info_file = fopen (aux_info_file_name, "w");
5149 if (aux_info_file == 0)
5150 fatal_io_error ("can't open %s", aux_info_file_name);
5153 if (! targetm.have_named_sections)
5155 if (flag_function_sections)
5157 warning ("-ffunction-sections not supported for this target");
5158 flag_function_sections = 0;
5160 if (flag_data_sections)
5162 warning ("-fdata-sections not supported for this target");
5163 flag_data_sections = 0;
5167 if (flag_function_sections && profile_flag)
5169 warning ("-ffunction-sections disabled; it makes profiling impossible");
5170 flag_function_sections = 0;
5173 #ifndef HAVE_prefetch
5174 if (flag_prefetch_loop_arrays)
5176 warning ("-fprefetch-loop-arrays not supported for this target");
5177 flag_prefetch_loop_arrays = 0;
5180 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5182 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5183 flag_prefetch_loop_arrays = 0;
5187 /* This combination of options isn't handled for i386 targets and doesn't
5188 make much sense anyway, so don't allow it. */
5189 if (flag_prefetch_loop_arrays && optimize_size)
5191 warning ("-fprefetch-loop-arrays is not supported with -Os");
5192 flag_prefetch_loop_arrays = 0;
5195 #ifndef OBJECT_FORMAT_ELF
5196 if (flag_function_sections && write_symbols != NO_DEBUG)
5197 warning ("-ffunction-sections may affect debugging on some targets");
5200 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5201 if (flag_signaling_nans)
5202 flag_trapping_math = 1;
5205 /* Initialize the compiler back end. */
5209 /* init_emit_once uses reg_raw_mode and therefore must be called
5210 after init_regs which initialized reg_raw_mode. */
5212 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5213 || debug_info_level == DINFO_LEVEL_VERBOSE
5214 #ifdef VMS_DEBUGGING_INFO
5215 /* Enable line number info for traceback */
5216 || debug_info_level > DINFO_LEVEL_NONE
5218 || flag_test_coverage
5219 || warn_notreached);
5220 init_fake_stack_mems ();
5224 init_function_once ();
5225 init_varasm_once ();
5227 /* The following initialization functions need to generate rtl, so
5228 provide a dummy function context for them. */
5229 init_dummy_function_start ();
5231 if (flag_caller_saves)
5232 init_caller_save ();
5233 expand_dummy_function_end ();
5236 /* Language-dependent initialization. Returns nonzero on success. */
5238 lang_dependent_init (name)
5241 if (dump_base_name == 0)
5242 dump_base_name = name ? name : "gccdump";
5244 /* Front-end initialization. This hook can assume that GC,
5245 identifier hashes etc. are set up, but debug initialization is
5246 not done yet. This routine must return the original filename
5247 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5248 name = (*lang_hooks.init) (name);
5252 /* Is this duplication necessary? */
5253 name = ggc_strdup (name);
5254 main_input_filename = input_filename = name;
5255 init_asm_output (name);
5257 /* These create various _DECL nodes, so need to be called after the
5258 front end is initialized. */
5262 /* The following initialization functions need to generate rtl, so
5263 provide a dummy function context for them. */
5264 init_dummy_function_start ();
5266 expand_dummy_function_end ();
5268 /* Put an entry on the input file stack for the main input file. */
5269 push_srcloc (input_filename, 0);
5271 /* If dbx symbol table desired, initialize writing it and output the
5272 predefined types. */
5273 timevar_push (TV_SYMOUT);
5275 #ifdef DWARF2_UNWIND_INFO
5276 if (dwarf2out_do_frame ())
5277 dwarf2out_frame_init ();
5280 /* Now we have the correct original filename, we can initialize
5282 (*debug_hooks->init) (name);
5284 timevar_pop (TV_SYMOUT);
5289 /* Clean up: close opened files, etc. */
5294 /* Close the dump files. */
5295 if (flag_gen_aux_info)
5297 fclose (aux_info_file);
5299 unlink (aux_info_file_name);
5302 /* Close non-debugging input and output files. Take special care to note
5303 whether fclose returns an error, since the pages might still be on the
5304 buffer chain while the file is open. */
5308 if (ferror (asm_out_file) != 0)
5309 fatal_io_error ("error writing to %s", asm_file_name);
5310 if (fclose (asm_out_file) != 0)
5311 fatal_io_error ("error closing %s", asm_file_name);
5314 /* Do whatever is necessary to finish printing the graphs. */
5315 if (graph_dump_format != no_graph)
5319 for (i = 0; i < (int) DFI_MAX; ++i)
5320 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5325 sprintf (seq, DUMPFILE_FORMAT, i);
5326 suffix = concat (seq, dump_file[i].extension, NULL);
5327 finish_graph_dump_file (dump_base_name, suffix);
5334 ggc_print_statistics ();
5335 stringpool_statistics ();
5336 dump_tree_statistics ();
5339 /* Free up memory for the benefit of leak detectors. */
5342 /* Language-specific end of compilation actions. */
5343 (*lang_hooks.finish) ();
5346 /* Initialize the compiler, and compile the input file. */
5350 /* All command line options have been parsed; allow the front end to
5351 perform consistency checks, etc. */
5352 bool no_backend = (*lang_hooks.post_options) ();
5354 /* The bulk of command line switch processing. */
5357 /* If an error has already occurred, give up. */
5365 char *name = xstrdup (lbasename (filename));
5367 aux_base_name = name;
5368 strip_off_ending (name, strlen (name));
5371 aux_base_name = "gccaux";
5373 /* We cannot start timing until after options are processed since that
5374 says if we run timers or not. */
5376 timevar_start (TV_TOTAL);
5378 /* Set up the back-end if requested. */
5382 /* Language-dependent initialization. Returns true on success. */
5383 if (lang_dependent_init (filename))
5388 /* Stop timing and print the times. */
5389 timevar_stop (TV_TOTAL);
5390 timevar_print (stderr);
5393 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5394 Decode command args, then call compile_file.
5395 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5396 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5398 It is not safe to call this function more than once. */
5401 toplev_main (argc, argv)
5405 /* Initialization of GCC's environment, and diagnostics. */
5406 general_init (argv[0]);
5408 /* Parse the options and do minimal processing; basically just
5409 enough to default flags appropriately. */
5410 parse_options_and_default_flags (argc, argv);
5412 /* Exit early if we can (e.g. -help). */
5413 if (!exit_after_options)
5416 if (errorcount || sorrycount)
5417 return (FATAL_EXIT_CODE);
5419 return (SUCCESS_EXIT_CODE);