1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
46 #include "insn-attr.h"
47 #include "insn-config.h"
48 #include "insn-flags.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
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 { "ce1", 'C', 1, 0, 0 },
283 { "cfg", 'f', 1, 0, 0 },
284 { "bp", 'b', 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 commentry 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 accross 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. */
1908 DECL_DEFER_OUTPUT (decl) = 0;
1910 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1911 (*lang_hooks.finish_incomplete_decl) (decl);
1914 /* Now emit any global variables or functions that we have been
1915 putting off. We need to loop in case one of the things emitted
1916 here references another one which comes earlier in the list. */
1920 for (i = 0; i < len; i++)
1924 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1927 /* Don't write out static consts, unless we still need them.
1929 We also keep static consts if not optimizing (for debugging),
1930 unless the user specified -fno-keep-static-consts.
1931 ??? They might be better written into the debug information.
1932 This is possible when using DWARF.
1934 A language processor that wants static constants to be always
1935 written out (even if it is not used) is responsible for
1936 calling rest_of_decl_compilation itself. E.g. the C front-end
1937 calls rest_of_decl_compilation from finish_decl.
1938 One motivation for this is that is conventional in some
1939 environments to write things like:
1940 static const char rcsid[] = "... version string ...";
1941 intending to force the string to be in the executable.
1943 A language processor that would prefer to have unneeded
1944 static constants "optimized away" would just defer writing
1945 them out until here. E.g. C++ does this, because static
1946 constants are often defined in header files.
1948 ??? A tempting alternative (for both C and C++) would be
1949 to force a constant to be written if and only if it is
1950 defined in a main file, as opposed to an include file. */
1952 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1956 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1958 else if (DECL_COMDAT (decl))
1960 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1961 && (optimize || !flag_keep_static_consts
1962 || DECL_ARTIFICIAL (decl)))
1968 rest_of_decl_compilation (decl, NULL, 1, 1);
1972 if (TREE_CODE (decl) == FUNCTION_DECL
1973 && DECL_INITIAL (decl) != 0
1974 && DECL_SAVED_INSNS (decl) != 0
1975 && (flag_keep_inline_functions
1976 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1977 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1980 output_inline_function (decl);
1985 output_something = 1;
1989 return output_something;
1992 /* Issue appropriate warnings for the global declarations in VEC (of
1993 which there are LEN). Output debugging information for them. */
1996 check_global_declarations (vec, len)
2003 for (i = 0; i < len; i++)
2007 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2008 && ! TREE_ASM_WRITTEN (decl))
2009 /* Cancel the RTL for this decl so that, if debugging info
2010 output for global variables is still to come,
2011 this one will be omitted. */
2012 SET_DECL_RTL (decl, NULL_RTX);
2014 /* Warn about any function
2015 declared static but not defined.
2016 We don't warn about variables,
2017 because many programs have static variables
2018 that exist only to get some text into the object file. */
2019 if (TREE_CODE (decl) == FUNCTION_DECL
2020 && (warn_unused_function
2021 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2022 && DECL_INITIAL (decl) == 0
2023 && DECL_EXTERNAL (decl)
2024 && ! DECL_ARTIFICIAL (decl)
2025 && ! TREE_PUBLIC (decl))
2027 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2028 pedwarn_with_decl (decl,
2029 "`%s' used but never defined");
2031 warning_with_decl (decl,
2032 "`%s' declared `static' but never defined");
2033 /* This symbol is effectively an "extern" declaration now. */
2034 TREE_PUBLIC (decl) = 1;
2035 assemble_external (decl);
2038 /* Warn about static fns or vars defined but not used. */
2039 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2040 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2041 && ! TREE_USED (decl)
2042 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2043 to handle multiple external decls in different scopes. */
2044 && ! TREE_USED (DECL_NAME (decl))
2045 && ! DECL_EXTERNAL (decl)
2046 && ! TREE_PUBLIC (decl)
2047 /* Global register variables must be declared to reserve them. */
2048 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2049 /* Otherwise, ask the language. */
2050 && (*lang_hooks.decls.warn_unused_global) (decl))
2051 warning_with_decl (decl, "`%s' defined but not used");
2053 timevar_push (TV_SYMOUT);
2054 (*debug_hooks->global_decl) (decl);
2055 timevar_pop (TV_SYMOUT);
2059 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2060 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2061 INPUT_FILENAME and LINENO accordingly. */
2064 push_srcloc (file, line)
2068 struct file_stack *fs;
2070 if (input_file_stack)
2072 input_file_stack->name = input_filename;
2073 input_file_stack->line = lineno;
2076 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2077 fs->name = input_filename = file;
2078 fs->line = lineno = line;
2079 fs->next = input_file_stack;
2080 input_file_stack = fs;
2081 input_file_stack_tick++;
2084 /* Pop the top entry off the stack of presently open source files.
2085 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2091 struct file_stack *fs;
2093 fs = input_file_stack;
2094 input_file_stack = fs->next;
2096 input_file_stack_tick++;
2097 /* The initial source file is never popped. */
2098 if (!input_file_stack)
2100 input_filename = input_file_stack->name;
2101 lineno = input_file_stack->line;
2104 /* Compile an entire translation unit. Write a file of assembly
2105 output and various debugging dumps. */
2112 /* Initialize yet another pass. */
2114 init_final (main_input_filename);
2115 init_branch_prob (aux_base_name);
2117 timevar_push (TV_PARSE);
2119 /* Call the parser, which parses the entire file (calling
2120 rest_of_compilation for each function). */
2121 (*lang_hooks.parse_file) (set_yydebug);
2123 /* In case there were missing block closers,
2124 get us back to the global binding level. */
2125 (*lang_hooks.clear_binding_stack) ();
2127 /* Compilation is now finished except for writing
2128 what's left of the symbol table output. */
2129 timevar_pop (TV_PARSE);
2131 if (flag_syntax_only)
2134 globals = (*lang_hooks.decls.getdecls) ();
2136 /* Really define vars that have had only a tentative definition.
2137 Really output inline functions that must actually be callable
2138 and have not been output so far. */
2141 int len = list_length (globals);
2142 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2146 /* Process the decls in reverse order--earliest first.
2147 Put them into VEC from back to front, then take out from front. */
2149 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2150 vec[len - i - 1] = decl;
2152 wrapup_global_declarations (vec, len);
2154 /* This must occur after the loop to output deferred functions. Else
2155 the profiler initializer would not be emitted if all the functions
2156 in this compilation unit were deferred.
2158 output_func_start_profiler can not cause any additional functions or
2159 data to need to be output, so it need not be in the deferred function
2161 output_func_start_profiler ();
2163 check_global_declarations (vec, len);
2169 /* Write out any pending weak symbol declarations. */
2173 /* Do dbx symbols. */
2174 timevar_push (TV_SYMOUT);
2176 #ifdef DWARF2_UNWIND_INFO
2177 if (dwarf2out_do_frame ())
2178 dwarf2out_frame_finish ();
2181 (*debug_hooks->finish) (main_input_filename);
2182 timevar_pop (TV_SYMOUT);
2184 /* Output some stuff at end of file if nec. */
2186 dw2_output_indirect_constants ();
2188 end_final (aux_base_name);
2190 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2192 timevar_push (TV_DUMP);
2193 open_dump_file (DFI_bp, NULL);
2197 close_dump_file (DFI_bp, NULL, NULL_RTX);
2198 timevar_pop (TV_DUMP);
2202 ASM_FILE_END (asm_out_file);
2205 /* Attach a special .ident directive to the end of the file to identify
2206 the version of GCC which compiled this code. The format of the .ident
2207 string is patterned after the ones produced by native SVR4 compilers. */
2210 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2211 IDENT_ASM_OP, version_string);
2214 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2216 timevar_push (TV_DUMP);
2217 dump_combine_total_stats (rtl_dump_file);
2218 close_dump_file (DFI_combine, NULL, NULL_RTX);
2219 timevar_pop (TV_DUMP);
2223 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2224 and TYPE_DECL nodes.
2226 This does nothing for local (non-static) variables, unless the
2227 variable is a register variable with an ASMSPEC. In that case, or
2228 if the variable is not an automatic, it sets up the RTL and
2229 outputs any assembler code (label definition, storage allocation
2230 and initialization).
2232 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2233 the assembler symbol name to be used. TOP_LEVEL is nonzero
2234 if this declaration is not within a function. */
2237 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2239 const char *asmspec;
2243 /* Declarations of variables, and of functions defined elsewhere. */
2245 /* The most obvious approach, to put an #ifndef around where
2246 this macro is used, doesn't work since it's inside a macro call. */
2247 #ifndef ASM_FINISH_DECLARE_OBJECT
2248 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2251 /* We deferred calling assemble_alias so that we could collect
2252 other attributes such as visibility. Emit the alias now. */
2255 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2258 alias = TREE_VALUE (TREE_VALUE (alias));
2259 alias = get_identifier (TREE_STRING_POINTER (alias));
2260 assemble_alias (decl, alias);
2264 /* Forward declarations for nested functions are not "external",
2265 but we need to treat them as if they were. */
2266 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2267 || TREE_CODE (decl) == FUNCTION_DECL)
2269 timevar_push (TV_VARCONST);
2272 make_decl_rtl (decl, asmspec);
2274 /* Don't output anything when a tentative file-scope definition
2275 is seen. But at end of compilation, do output code for them. */
2276 if (at_end || !DECL_DEFER_OUTPUT (decl))
2277 assemble_variable (decl, top_level, at_end, 0);
2278 if (decl == last_assemble_variable_decl)
2280 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2284 timevar_pop (TV_VARCONST);
2286 else if (DECL_REGISTER (decl) && asmspec != 0)
2288 if (decode_reg_name (asmspec) >= 0)
2290 SET_DECL_RTL (decl, NULL_RTX);
2291 make_decl_rtl (decl, asmspec);
2295 error ("invalid register name `%s' for register variable", asmspec);
2296 DECL_REGISTER (decl) = 0;
2301 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2302 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2303 && TREE_CODE (decl) == TYPE_DECL)
2305 timevar_push (TV_SYMOUT);
2306 dbxout_symbol (decl, 0);
2307 timevar_pop (TV_SYMOUT);
2310 #ifdef SDB_DEBUGGING_INFO
2311 else if (write_symbols == SDB_DEBUG && top_level
2312 && TREE_CODE (decl) == TYPE_DECL)
2314 timevar_push (TV_SYMOUT);
2315 sdbout_symbol (decl, 0);
2316 timevar_pop (TV_SYMOUT);
2319 #ifdef DWARF2_DEBUGGING_INFO
2320 else if ((write_symbols == DWARF2_DEBUG
2321 || write_symbols == VMS_AND_DWARF2_DEBUG)
2323 && TREE_CODE (decl) == TYPE_DECL)
2325 timevar_push (TV_SYMOUT);
2326 dwarf2out_decl (decl);
2327 timevar_pop (TV_SYMOUT);
2332 /* Called after finishing a record, union or enumeral type. */
2335 rest_of_type_compilation (type, toplev)
2336 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2340 tree type ATTRIBUTE_UNUSED;
2341 int toplev ATTRIBUTE_UNUSED;
2344 timevar_push (TV_SYMOUT);
2345 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2346 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2347 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2349 #ifdef SDB_DEBUGGING_INFO
2350 if (write_symbols == SDB_DEBUG)
2351 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2353 #ifdef DWARF2_DEBUGGING_INFO
2354 if ((write_symbols == DWARF2_DEBUG
2355 || write_symbols == VMS_AND_DWARF2_DEBUG)
2357 dwarf2out_decl (TYPE_STUB_DECL (type));
2359 timevar_pop (TV_SYMOUT);
2362 /* This is called from finish_function (within langhooks.parse_file)
2363 after each top-level definition is parsed.
2364 It is supposed to compile that function or variable
2365 and output the assembler code for it.
2366 After we return, the tree storage is freed. */
2369 rest_of_compilation (decl)
2375 int rebuild_label_notes_after_reload;
2376 int register_life_up_to_date;
2378 timevar_push (TV_REST_OF_COMPILATION);
2380 /* Now that we're out of the frontend, we shouldn't have any more
2381 CONCATs anywhere. */
2382 generating_concat_p = 0;
2384 /* When processing delayed functions, prepare_function_start() won't
2385 have been run to re-initialize it. */
2386 cse_not_expected = ! optimize;
2388 /* First, make sure that NOTE_BLOCK is set correctly for each
2389 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2390 if (!cfun->x_whole_function_mode_p)
2393 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2394 tree in sensible shape. So, we just recalculate it here. */
2395 if (cfun->x_whole_function_mode_p)
2400 /* If we are reconsidering an inline function
2401 at the end of compilation, skip the stuff for making it inline. */
2403 if (DECL_SAVED_INSNS (decl) == 0)
2409 /* If this is nested inside an inlined external function, pretend
2410 it was only declared. Since we cannot inline such functions,
2411 generating code for this one is not only not necessary but will
2412 confuse some debugging output writers. */
2413 for (parent = DECL_CONTEXT (current_function_decl);
2414 parent != NULL_TREE;
2415 parent = get_containing_scope (parent))
2416 if (TREE_CODE (parent) == FUNCTION_DECL
2417 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2419 DECL_INITIAL (decl) = 0;
2420 goto exit_rest_of_compilation;
2423 /* If requested, consider whether to make this function inline. */
2424 if ((DECL_INLINE (decl) && !flag_no_inline)
2425 || flag_inline_functions)
2427 timevar_push (TV_INTEGRATION);
2428 lose = function_cannot_inline_p (decl);
2429 timevar_pop (TV_INTEGRATION);
2430 if (lose || ! optimize)
2432 if (warn_inline && DECL_INLINE (decl))
2433 warning_with_decl (decl, lose);
2434 DECL_ABSTRACT_ORIGIN (decl) = 0;
2435 /* Don't really compile an extern inline function.
2436 If we can't make it inline, pretend
2437 it was only declared. */
2438 if (DECL_EXTERNAL (decl))
2440 DECL_INITIAL (decl) = 0;
2441 goto exit_rest_of_compilation;
2445 /* ??? Note that this has the effect of making it look
2446 like "inline" was specified for a function if we choose
2447 to inline it. This isn't quite right, but it's
2448 probably not worth the trouble to fix. */
2449 inlinable = DECL_INLINE (decl) = 1;
2452 insns = get_insns ();
2454 /* Dump the rtl code if we are dumping rtl. */
2456 if (open_dump_file (DFI_rtl, decl))
2458 if (DECL_SAVED_INSNS (decl))
2459 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2460 close_dump_file (DFI_rtl, print_rtl, insns);
2463 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2464 sorts of eh initialization. Delay this until after the
2465 initial rtl dump so that we can see the original nesting. */
2466 convert_from_eh_region_ranges ();
2468 /* If function is inline, and we don't yet know whether to
2469 compile it by itself, defer decision till end of compilation.
2470 finish_compilation will call rest_of_compilation again
2471 for those functions that need to be output. Also defer those
2472 functions that we are supposed to defer. */
2475 || (DECL_INLINE (decl)
2476 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2477 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2478 && ! flag_keep_inline_functions)
2479 || DECL_EXTERNAL (decl))))
2480 DECL_DEFER_OUTPUT (decl) = 1;
2482 if (DECL_INLINE (decl))
2483 /* DWARF wants separate debugging info for abstract and
2484 concrete instances of all inline functions, including those
2485 declared inline but not inlined, and those inlined even
2486 though they weren't declared inline. Conveniently, that's
2487 what DECL_INLINE means at this point. */
2488 (*debug_hooks->deferred_inline_function) (decl);
2490 if (DECL_DEFER_OUTPUT (decl))
2492 /* If -Wreturn-type, we have to do a bit of compilation. We just
2493 want to call cleanup the cfg to figure out whether or not we can
2494 fall off the end of the function; we do the minimum amount of
2495 work necessary to make that safe. */
2496 if (warn_return_type)
2498 int saved_optimize = optimize;
2501 rebuild_jump_labels (insns);
2502 find_exception_handler_labels ();
2503 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2504 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2505 optimize = saved_optimize;
2507 /* CFG is no longer maintained up-to-date. */
2508 free_bb_for_insn ();
2511 set_nothrow_function_flags ();
2512 if (current_function_nothrow)
2513 /* Now we know that this can't throw; set the flag for the benefit
2514 of other functions later in this translation unit. */
2515 TREE_NOTHROW (current_function_decl) = 1;
2517 timevar_push (TV_INTEGRATION);
2518 save_for_inline (decl);
2519 timevar_pop (TV_INTEGRATION);
2520 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2521 goto exit_rest_of_compilation;
2524 /* If specified extern inline but we aren't inlining it, we are
2525 done. This goes for anything that gets here with DECL_EXTERNAL
2526 set, not just things with DECL_INLINE. */
2527 if (DECL_EXTERNAL (decl))
2528 goto exit_rest_of_compilation;
2531 /* If we're emitting a nested function, make sure its parent gets
2532 emitted as well. Doing otherwise confuses debug info. */
2535 for (parent = DECL_CONTEXT (current_function_decl);
2536 parent != NULL_TREE;
2537 parent = get_containing_scope (parent))
2538 if (TREE_CODE (parent) == FUNCTION_DECL)
2539 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2542 /* We are now committed to emitting code for this function. Do any
2543 preparation, such as emitting abstract debug info for the inline
2544 before it gets mangled by optimization. */
2545 if (DECL_INLINE (decl))
2546 (*debug_hooks->outlining_inline_function) (decl);
2548 /* Remove any notes we don't need. That will make iterating
2549 over the instruction sequence faster, and allow the garbage
2550 collector to reclaim the memory used by the notes. */
2551 remove_unnecessary_notes ();
2556 /* Initialize some variables used by the optimizers. */
2557 init_function_for_compilation ();
2559 if (! DECL_DEFER_OUTPUT (decl))
2560 TREE_ASM_WRITTEN (decl) = 1;
2562 /* Now that integrate will no longer see our rtl, we need not
2563 distinguish between the return value of this function and the
2564 return value of called functions. Also, we can remove all SETs
2565 of subregs of hard registers; they are only here because of
2566 integrate. Also, we can now initialize pseudos intended to
2567 carry magic hard reg data throughout the function. */
2568 rtx_equal_function_value_matters = 0;
2569 purge_hard_subreg_sets (get_insns ());
2571 /* Early return if there were errors. We can run afoul of our
2572 consistency checks, and there's not really much point in fixing them.
2573 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2574 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2575 || errorcount || sorrycount)
2576 goto exit_rest_of_compilation;
2578 timevar_push (TV_JUMP);
2579 open_dump_file (DFI_sibling, decl);
2580 insns = get_insns ();
2581 rebuild_jump_labels (insns);
2582 find_exception_handler_labels ();
2583 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2585 delete_unreachable_blocks ();
2587 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2588 timevar_push (TV_BRANCH_PROB);
2589 note_prediction_to_br_prob ();
2590 timevar_pop (TV_BRANCH_PROB);
2592 /* We may have potential sibling or tail recursion sites. Select one
2593 (of possibly multiple) methods of performing the call. */
2594 if (flag_optimize_sibling_calls)
2597 optimize_sibling_and_tail_recursive_calls ();
2599 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2600 free_bb_for_insn ();
2601 find_exception_handler_labels ();
2602 rebuild_jump_labels (insns);
2603 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2605 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2606 notes before simplifying cfg and we must do lowering after sibcall
2607 that unhides parts of RTL chain and cleans up the CFG.
2609 Until sibcall is replaced by tree-level optimizer, lets just
2610 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2611 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2612 if (GET_CODE (insn) == NOTE
2613 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2616 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2617 timevar_pop (TV_JUMP);
2619 scope_to_insns_initialize ();
2620 /* Complete generation of exception handling code. */
2623 timevar_push (TV_JUMP);
2624 open_dump_file (DFI_eh, decl);
2626 finish_eh_generation ();
2628 close_dump_file (DFI_eh, print_rtl, get_insns ());
2629 timevar_pop (TV_JUMP);
2632 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2633 generation, which might create new sets. */
2634 emit_initial_value_sets ();
2637 /* If we are doing position-independent code generation, now
2638 is the time to output special prologues and epilogues.
2639 We do not want to do this earlier, because it just clutters
2640 up inline functions with meaningless insns. */
2645 insns = get_insns ();
2647 /* Copy any shared structure that should not be shared. */
2648 unshare_all_rtl (current_function_decl, insns);
2650 #ifdef SETJMP_VIA_SAVE_AREA
2651 /* This must be performed before virtual register instantiation.
2652 Please be aware the everything in the compiler that can look
2653 at the RTL up to this point must understand that REG_SAVE_AREA
2654 is just like a use of the REG contained inside. */
2655 if (current_function_calls_alloca)
2656 optimize_save_area_alloca (insns);
2659 /* Instantiate all virtual registers. */
2660 instantiate_virtual_regs (current_function_decl, insns);
2662 open_dump_file (DFI_jump, decl);
2664 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2665 are initialized and to compute whether control can drop off the end
2668 timevar_push (TV_JUMP);
2669 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2670 before jump optimization switches branch directions. */
2671 expected_value_to_br_prob ();
2673 reg_scan (insns, max_reg_num (), 0);
2674 rebuild_jump_labels (insns);
2675 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2677 dump_flow_info (rtl_dump_file);
2678 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2679 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2681 /* CFG is no longer maintained up-to-date. */
2682 free_bb_for_insn ();
2683 copy_loop_headers (insns);
2684 purge_line_number_notes (insns);
2685 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2687 timevar_pop (TV_JUMP);
2688 close_dump_file (DFI_jump, print_rtl, insns);
2690 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2691 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2693 goto exit_rest_of_compilation;
2696 /* Long term, this should probably move before the jump optimizer too,
2697 but I didn't want to disturb the rtl_dump_and_exit and related
2698 stuff at this time. */
2699 if (optimize > 0 && flag_ssa)
2701 /* Convert to SSA form. */
2703 timevar_push (TV_TO_SSA);
2704 open_dump_file (DFI_ssa, decl);
2706 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2709 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2710 timevar_pop (TV_TO_SSA);
2712 /* Perform sparse conditional constant propagation, if requested. */
2715 timevar_push (TV_SSA_CCP);
2716 open_dump_file (DFI_ssa_ccp, decl);
2720 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2721 timevar_pop (TV_SSA_CCP);
2724 /* It would be useful to cleanup the CFG at this point, but block
2725 merging and possibly other transformations might leave a PHI
2726 node in the middle of a basic block, which is a strict no-no. */
2728 /* The SSA implementation uses basic block numbers in its phi
2729 nodes. Thus, changing the control-flow graph or the basic
2730 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2731 may cause problems. */
2735 /* Remove dead code. */
2737 timevar_push (TV_SSA_DCE);
2738 open_dump_file (DFI_ssa_dce, decl);
2740 insns = get_insns ();
2741 ssa_eliminate_dead_code ();
2743 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2744 timevar_pop (TV_SSA_DCE);
2747 /* Convert from SSA form. */
2749 timevar_push (TV_FROM_SSA);
2750 open_dump_file (DFI_ussa, decl);
2752 convert_from_ssa ();
2753 /* New registers have been created. Rescan their usage. */
2754 reg_scan (insns, max_reg_num (), 1);
2756 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2757 timevar_pop (TV_FROM_SSA);
2762 timevar_push (TV_JUMP);
2763 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP: 0);
2765 /* Try to identify useless null pointer tests and delete them. */
2766 if (flag_delete_null_pointer_checks)
2768 open_dump_file (DFI_null, decl);
2770 dump_flow_info (rtl_dump_file);
2772 if (delete_null_pointer_checks (insns))
2773 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2775 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2778 /* Jump optimization, and the removal of NULL pointer checks, may
2779 have reduced the number of instructions substantially. CSE, and
2780 future passes, allocate arrays whose dimensions involve the
2781 maximum instruction UID, so if we can reduce the maximum UID
2782 we'll save big on memory. */
2783 renumber_insns (rtl_dump_file);
2784 timevar_pop (TV_JUMP);
2786 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2790 /* Perform common subexpression elimination.
2791 Nonzero value from `cse_main' means that jumps were simplified
2792 and some code may now be unreachable, so do
2793 jump optimization again. */
2797 open_dump_file (DFI_cse, decl);
2799 dump_flow_info (rtl_dump_file);
2800 timevar_push (TV_CSE);
2802 reg_scan (insns, max_reg_num (), 1);
2804 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2806 rebuild_jump_labels (insns);
2807 purge_all_dead_edges (0);
2809 delete_trivially_dead_insns (insns, max_reg_num ());
2811 /* If we are not running more CSE passes, then we are no longer
2812 expecting CSE to be run. But always rerun it in a cheap mode. */
2813 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2815 if (tem || optimize > 1)
2816 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2817 /* Try to identify useless null pointer tests and delete them. */
2818 if (flag_delete_null_pointer_checks)
2820 timevar_push (TV_JUMP);
2822 if (delete_null_pointer_checks (insns))
2823 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2824 timevar_pop (TV_JUMP);
2827 /* The second pass of jump optimization is likely to have
2828 removed a bunch more instructions. */
2829 renumber_insns (rtl_dump_file);
2831 timevar_pop (TV_CSE);
2832 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2835 open_dump_file (DFI_addressof, decl);
2837 purge_addressof (insns);
2839 purge_all_dead_edges (0);
2840 reg_scan (insns, max_reg_num (), 1);
2842 close_dump_file (DFI_addressof, print_rtl, insns);
2846 /* Perform global cse. */
2848 if (optimize > 0 && flag_gcse)
2850 int save_csb, save_cfj;
2853 timevar_push (TV_GCSE);
2854 open_dump_file (DFI_gcse, decl);
2856 tem = gcse_main (insns, rtl_dump_file);
2857 rebuild_jump_labels (insns);
2858 delete_trivially_dead_insns (insns, max_reg_num ());
2860 save_csb = flag_cse_skip_blocks;
2861 save_cfj = flag_cse_follow_jumps;
2862 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2864 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2866 if (flag_expensive_optimizations)
2868 timevar_push (TV_CSE);
2869 reg_scan (insns, max_reg_num (), 1);
2870 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2871 purge_all_dead_edges (0);
2872 delete_trivially_dead_insns (insns, max_reg_num ());
2873 timevar_pop (TV_CSE);
2874 cse_not_expected = !flag_rerun_cse_after_loop;
2877 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2878 things up. Then possibly re-run CSE again. */
2882 timevar_push (TV_JUMP);
2883 rebuild_jump_labels (insns);
2884 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2885 timevar_pop (TV_JUMP);
2887 if (flag_expensive_optimizations)
2889 timevar_push (TV_CSE);
2890 reg_scan (insns, max_reg_num (), 1);
2891 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2892 purge_all_dead_edges (0);
2893 delete_trivially_dead_insns (insns, max_reg_num ());
2894 timevar_pop (TV_CSE);
2898 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2899 timevar_pop (TV_GCSE);
2902 flag_cse_skip_blocks = save_csb;
2903 flag_cse_follow_jumps = save_cfj;
2904 #ifdef ENABLE_CHECKING
2905 verify_flow_info ();
2909 /* Move constant computations out of loops. */
2911 if (optimize > 0 && flag_loop_optimize)
2913 int do_unroll, do_prefetch;
2915 timevar_push (TV_LOOP);
2916 delete_dead_jumptables ();
2917 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2918 open_dump_file (DFI_loop, decl);
2919 /* CFG is no longer maintained up-to-date. */
2920 free_bb_for_insn ();
2922 do_unroll = flag_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2923 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2924 if (flag_rerun_loop_opt)
2926 cleanup_barriers ();
2928 /* We only want to perform unrolling once. */
2929 loop_optimize (insns, rtl_dump_file, do_unroll);
2932 /* The first call to loop_optimize makes some instructions
2933 trivially dead. We delete those instructions now in the
2934 hope that doing so will make the heuristics in loop work
2935 better and possibly speed up compilation. */
2936 delete_trivially_dead_insns (insns, max_reg_num ());
2938 /* The regscan pass is currently necessary as the alias
2939 analysis code depends on this information. */
2940 reg_scan (insns, max_reg_num (), 1);
2942 cleanup_barriers ();
2943 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2945 /* Loop can create trivially dead instructions. */
2946 delete_trivially_dead_insns (insns, max_reg_num ());
2947 close_dump_file (DFI_loop, print_rtl, insns);
2948 timevar_pop (TV_LOOP);
2949 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2954 /* Do control and data flow analysis; wrote some of the results to
2957 timevar_push (TV_FLOW);
2958 open_dump_file (DFI_cfg, decl);
2960 dump_flow_info (rtl_dump_file);
2961 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2962 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2964 /* It may make more sense to mark constant functions after dead code is
2965 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2966 may insert code making function non-constant, but we still must consider
2967 it as constant, otherwise -fbranch-probabilities will not read data back.
2969 life_analyzis rarely eliminates modification of external memory.
2972 mark_constant_function ();
2974 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2976 /* Do branch profiling and static profile estimation passes. */
2977 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
2981 timevar_push (TV_BRANCH_PROB);
2982 open_dump_file (DFI_bp, decl);
2983 if (cfun->arc_profile || flag_branch_probabilities)
2986 /* Discover and record the loop depth at the head of each basic
2987 block. The loop infrastructure does the real job for us. */
2988 flow_loops_find (&loops, LOOP_TREE);
2991 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2993 /* Estimate using heuristics if no profiling info is available. */
2994 if (flag_guess_branch_prob)
2995 estimate_probability (&loops);
2997 flow_loops_free (&loops);
2998 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2999 timevar_pop (TV_BRANCH_PROB);
3001 if (flag_if_conversion)
3003 timevar_push (TV_IFCVT);
3005 dump_flow_info (rtl_dump_file);
3006 open_dump_file (DFI_ce1, decl);
3007 cleanup_cfg (CLEANUP_EXPENSIVE);
3008 reg_scan (insns, max_reg_num (), 0);
3010 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3011 timevar_pop (TV_IFCVT);
3015 timevar_push (TV_TRACER);
3016 open_dump_file (DFI_tracer, decl);
3018 dump_flow_info (rtl_dump_file);
3019 cleanup_cfg (CLEANUP_EXPENSIVE);
3021 cleanup_cfg (CLEANUP_EXPENSIVE);
3022 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3023 timevar_pop (TV_TRACER);
3024 reg_scan (get_insns (), max_reg_num (), 0);
3029 timevar_push (TV_CSE2);
3030 open_dump_file (DFI_cse2, decl);
3032 dump_flow_info (rtl_dump_file);
3034 if (flag_rerun_cse_after_loop)
3036 timevar_push (TV_JUMP);
3037 reg_scan (insns, max_reg_num (), 0);
3038 timevar_pop (TV_JUMP);
3040 cleanup_cfg (CLEANUP_EXPENSIVE);
3041 /* CFG is no longer maintained up-to-date. */
3042 reg_scan (insns, max_reg_num (), 0);
3043 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3044 purge_all_dead_edges (0);
3045 delete_trivially_dead_insns (insns, max_reg_num ());
3049 timevar_push (TV_JUMP);
3050 rebuild_jump_labels (insns);
3051 cleanup_cfg (CLEANUP_EXPENSIVE);
3052 timevar_pop (TV_JUMP);
3056 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3057 timevar_pop (TV_CSE2);
3062 cse_not_expected = 1;
3064 open_dump_file (DFI_life, decl);
3067 check_function_return_warnings ();
3069 #ifdef ENABLE_CHECKING
3070 verify_flow_info ();
3072 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3074 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3075 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3076 timevar_pop (TV_FLOW);
3080 if (warn_uninitialized || extra_warnings)
3082 uninitialized_vars_warning (DECL_INITIAL (decl));
3084 setjmp_args_warning ();
3090 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3092 /* Insns were inserted, so things might look a bit different. */
3093 insns = get_insns ();
3094 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3095 PROP_LOG_LINKS | PROP_REG_INFO
3096 | PROP_DEATH_NOTES);
3100 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3104 /* If -opt, try combining insns through substitution. */
3108 int rebuild_jump_labels_after_combine = 0;
3110 timevar_push (TV_COMBINE);
3111 open_dump_file (DFI_combine, decl);
3113 rebuild_jump_labels_after_combine
3114 = combine_instructions (insns, max_reg_num ());
3116 /* Combining insns may have turned an indirect jump into a
3117 direct jump. Rebuid the JUMP_LABEL fields of jumping
3119 if (rebuild_jump_labels_after_combine)
3121 timevar_push (TV_JUMP);
3122 rebuild_jump_labels (insns);
3123 timevar_pop (TV_JUMP);
3125 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3128 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3129 timevar_pop (TV_COMBINE);
3134 /* Rerun if-conversion, as combine may have simplified things enough to
3135 now meet sequence length restrictions. */
3136 if (flag_if_conversion)
3138 timevar_push (TV_IFCVT);
3139 open_dump_file (DFI_ce2, decl);
3145 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3146 timevar_pop (TV_IFCVT);
3149 /* Register allocation pre-pass, to reduce number of moves
3150 necessary for two-address machines. */
3151 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3153 timevar_push (TV_REGMOVE);
3154 open_dump_file (DFI_regmove, decl);
3156 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3158 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3159 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3160 timevar_pop (TV_REGMOVE);
3165 /* Do unconditional splitting before register allocation to allow machine
3166 description to add extra information not needed previously. */
3167 split_all_insns (1);
3169 /* Any of the several passes since flow1 will have munged register
3170 lifetime data a bit. */
3171 register_life_up_to_date = 0;
3173 #ifdef OPTIMIZE_MODE_SWITCHING
3174 timevar_push (TV_MODE_SWITCH);
3177 optimize_mode_switching (NULL);
3180 timevar_pop (TV_MODE_SWITCH);
3183 timevar_push (TV_SCHED);
3185 #ifdef INSN_SCHEDULING
3187 /* Print function header into sched dump now
3188 because doing the sched analysis makes some of the dump. */
3189 if (optimize > 0 && flag_schedule_insns)
3191 open_dump_file (DFI_sched, decl);
3193 /* Do control and data sched analysis,
3194 and write some of the results to dump file. */
3196 schedule_insns (rtl_dump_file);
3198 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3200 /* Register lifetime information was updated as part of verifying
3202 register_life_up_to_date = 1;
3205 timevar_pop (TV_SCHED);
3209 /* Determine if the current function is a leaf before running reload
3210 since this can impact optimizations done by the prologue and
3211 epilogue thus changing register elimination offsets. */
3212 current_function_is_leaf = leaf_function_p ();
3214 timevar_push (TV_LOCAL_ALLOC);
3215 open_dump_file (DFI_lreg, decl);
3217 /* Allocate pseudo-regs that are used only within 1 basic block.
3219 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3220 jump optimizer after register allocation and reloading are finished. */
3222 if (! register_life_up_to_date)
3223 recompute_reg_usage (insns, ! optimize_size);
3225 if (flag_new_regalloc)
3227 delete_trivially_dead_insns (insns, max_reg_num ());
3230 timevar_pop (TV_LOCAL_ALLOC);
3231 if (dump_file[DFI_lreg].enabled)
3233 timevar_push (TV_DUMP);
3235 close_dump_file (DFI_lreg, NULL, NULL);
3236 timevar_pop (TV_DUMP);
3239 /* XXX clean up the whole mess to bring live info in shape again. */
3240 timevar_push (TV_GLOBAL_ALLOC);
3241 open_dump_file (DFI_greg, decl);
3243 build_insn_chain (insns);
3244 failure = reload (insns, 0);
3246 timevar_pop (TV_GLOBAL_ALLOC);
3248 if (dump_file[DFI_greg].enabled)
3250 timevar_push (TV_DUMP);
3252 dump_global_regs (rtl_dump_file);
3254 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3255 timevar_pop (TV_DUMP);
3259 goto exit_rest_of_compilation;
3260 reload_completed = 1;
3261 rebuild_label_notes_after_reload = 0;
3265 /* Allocate the reg_renumber array. */
3266 allocate_reg_info (max_regno, FALSE, TRUE);
3268 /* And the reg_equiv_memory_loc array. */
3269 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3271 allocate_initial_values (reg_equiv_memory_loc);
3273 regclass (insns, max_reg_num (), rtl_dump_file);
3274 rebuild_label_notes_after_reload = local_alloc ();
3276 timevar_pop (TV_LOCAL_ALLOC);
3278 if (dump_file[DFI_lreg].enabled)
3280 timevar_push (TV_DUMP);
3282 dump_flow_info (rtl_dump_file);
3283 dump_local_alloc (rtl_dump_file);
3285 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3286 timevar_pop (TV_DUMP);
3291 timevar_push (TV_GLOBAL_ALLOC);
3292 open_dump_file (DFI_greg, decl);
3294 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3295 pass fixing up any insns that are invalid. */
3298 failure = global_alloc (rtl_dump_file);
3301 build_insn_chain (insns);
3302 failure = reload (insns, 0);
3305 timevar_pop (TV_GLOBAL_ALLOC);
3307 if (dump_file[DFI_greg].enabled)
3309 timevar_push (TV_DUMP);
3311 dump_global_regs (rtl_dump_file);
3313 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3314 timevar_pop (TV_DUMP);
3318 goto exit_rest_of_compilation;
3323 open_dump_file (DFI_postreload, decl);
3325 /* Do a very simple CSE pass over just the hard registers. */
3328 timevar_push (TV_RELOAD_CSE_REGS);
3329 reload_cse_regs (insns);
3330 timevar_pop (TV_RELOAD_CSE_REGS);
3333 /* Register allocation and reloading may have turned an indirect jump into
3334 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3335 jumping instructions. */
3336 if (rebuild_label_notes_after_reload)
3338 timevar_push (TV_JUMP);
3340 rebuild_jump_labels (insns);
3341 purge_all_dead_edges (0);
3343 timevar_pop (TV_JUMP);
3346 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3348 /* Re-create the death notes which were deleted during reload. */
3349 timevar_push (TV_FLOW2);
3350 open_dump_file (DFI_flow2, decl);
3352 #ifdef ENABLE_CHECKING
3353 verify_flow_info ();
3356 /* If optimizing, then go ahead and split insns now. */
3358 split_all_insns (0);
3360 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3362 /* On some machines, the prologue and epilogue code, or parts thereof,
3363 can be represented as RTL. Doing so lets us schedule insns between
3364 it and the rest of the code and also allows delayed branch
3365 scheduling to operate in the epilogue. */
3366 thread_prologue_and_epilogue_insns (insns);
3370 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3371 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3372 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3374 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3375 even for machines with possibly nonzero RETURN_POPS_ARGS
3376 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3377 push instructions will have popping returns. */
3378 #ifndef PUSH_ROUNDING
3379 if (!ACCUMULATE_OUTGOING_ARGS)
3381 combine_stack_adjustments ();
3386 flow2_completed = 1;
3388 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3389 timevar_pop (TV_FLOW2);
3391 #ifdef HAVE_peephole2
3392 if (optimize > 0 && flag_peephole2)
3394 timevar_push (TV_PEEPHOLE2);
3395 open_dump_file (DFI_peephole2, decl);
3397 peephole2_optimize (rtl_dump_file);
3399 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3400 timevar_pop (TV_PEEPHOLE2);
3404 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3406 timevar_push (TV_RENAME_REGISTERS);
3407 open_dump_file (DFI_rnreg, decl);
3409 if (flag_rename_registers)
3410 regrename_optimize ();
3411 if (flag_cprop_registers)
3412 copyprop_hardreg_forward ();
3414 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3415 timevar_pop (TV_RENAME_REGISTERS);
3418 if (flag_if_conversion2)
3420 timevar_push (TV_IFCVT2);
3421 open_dump_file (DFI_ce3, decl);
3425 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3426 timevar_pop (TV_IFCVT2);
3430 split_all_insns (1);
3433 #ifdef INSN_SCHEDULING
3434 if (optimize > 0 && flag_schedule_insns_after_reload)
3436 timevar_push (TV_SCHED2);
3437 open_dump_file (DFI_sched2, decl);
3439 /* Do control and data sched analysis again,
3440 and write some more of the results to dump file. */
3442 split_all_insns (1);
3444 schedule_insns (rtl_dump_file);
3446 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3447 timevar_pop (TV_SCHED2);
3453 #ifdef LEAF_REGISTERS
3454 current_function_uses_only_leaf_regs
3455 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3459 timevar_push (TV_REG_STACK);
3460 open_dump_file (DFI_stack, decl);
3462 reg_to_stack (insns, rtl_dump_file);
3464 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3465 timevar_pop (TV_REG_STACK);
3471 timevar_push (TV_REORDER_BLOCKS);
3472 open_dump_file (DFI_bbro, decl);
3474 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3475 splitting possibly introduced more crossjumping oppurtuntities.
3476 Except that we can't actually run crossjumping without running
3477 another DCE pass, which we can't do after reg-stack. */
3478 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3479 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3480 if (flag_reorder_blocks)
3482 reorder_basic_blocks ();
3483 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3486 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3487 timevar_pop (TV_REORDER_BLOCKS);
3489 compute_alignments ();
3491 /* CFG is no longer maintained up-to-date. */
3492 free_bb_for_insn ();
3494 /* If a machine dependent reorganization is needed, call it. */
3495 #ifdef MACHINE_DEPENDENT_REORG
3496 timevar_push (TV_MACH_DEP);
3497 open_dump_file (DFI_mach, decl);
3499 MACHINE_DEPENDENT_REORG (insns);
3501 close_dump_file (DFI_mach, print_rtl, insns);
3502 timevar_pop (TV_MACH_DEP);
3507 purge_line_number_notes (insns);
3508 cleanup_barriers ();
3510 /* If a scheduling pass for delayed branches is to be done,
3511 call the scheduling code. */
3514 if (optimize > 0 && flag_delayed_branch)
3516 timevar_push (TV_DBR_SCHED);
3517 open_dump_file (DFI_dbr, decl);
3519 dbr_schedule (insns, rtl_dump_file);
3521 close_dump_file (DFI_dbr, print_rtl, insns);
3522 timevar_pop (TV_DBR_SCHED);
3528 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3529 timevar_push (TV_SHORTEN_BRANCH);
3530 split_all_insns_noflow ();
3531 timevar_pop (TV_SHORTEN_BRANCH);
3534 convert_to_eh_region_ranges ();
3536 /* Shorten branches. */
3537 timevar_push (TV_SHORTEN_BRANCH);
3538 shorten_branches (get_insns ());
3539 timevar_pop (TV_SHORTEN_BRANCH);
3541 set_nothrow_function_flags ();
3542 if (current_function_nothrow)
3543 /* Now we know that this can't throw; set the flag for the benefit
3544 of other functions later in this translation unit. */
3545 TREE_NOTHROW (current_function_decl) = 1;
3547 /* Now turn the rtl into assembler code. */
3549 timevar_push (TV_FINAL);
3554 /* Get the function's name, as described by its RTL. This may be
3555 different from the DECL_NAME name used in the source file. */
3557 x = DECL_RTL (decl);
3558 if (GET_CODE (x) != MEM)
3561 if (GET_CODE (x) != SYMBOL_REF)
3563 fnname = XSTR (x, 0);
3565 assemble_start_function (decl, fnname);
3566 final_start_function (insns, asm_out_file, optimize);
3567 final (insns, asm_out_file, optimize, 0);
3568 final_end_function ();
3570 #ifdef IA64_UNWIND_INFO
3571 /* ??? The IA-64 ".handlerdata" directive must be issued before
3572 the ".endp" directive that closes the procedure descriptor. */
3573 output_function_exception_table ();
3576 assemble_end_function (decl, fnname);
3578 #ifndef IA64_UNWIND_INFO
3579 /* Otherwise, it feels unclean to switch sections in the middle. */
3580 output_function_exception_table ();
3584 fflush (asm_out_file);
3586 /* Release all memory allocated by flow. */
3587 free_basic_block_vars (0);
3589 /* Release all memory held by regsets now. */
3590 regset_release_memory ();
3592 timevar_pop (TV_FINAL);
3596 /* Write DBX symbols if requested. */
3598 /* Note that for those inline functions where we don't initially
3599 know for certain that we will be generating an out-of-line copy,
3600 the first invocation of this routine (rest_of_compilation) will
3601 skip over this code by doing a `goto exit_rest_of_compilation;'.
3602 Later on, finish_compilation will call rest_of_compilation again
3603 for those inline functions that need to have out-of-line copies
3604 generated. During that call, we *will* be routed past here. */
3606 timevar_push (TV_SYMOUT);
3607 (*debug_hooks->function_decl) (decl);
3608 timevar_pop (TV_SYMOUT);
3610 exit_rest_of_compilation:
3612 /* In case the function was not output,
3613 don't leave any temporary anonymous types
3614 queued up for sdb output. */
3615 #ifdef SDB_DEBUGGING_INFO
3616 if (write_symbols == SDB_DEBUG)
3617 sdbout_types (NULL_TREE);
3620 reload_completed = 0;
3621 flow2_completed = 0;
3624 timevar_push (TV_FINAL);
3626 /* Clear out the insn_length contents now that they are no
3628 init_insn_lengths ();
3630 /* Show no temporary slots allocated. */
3633 free_basic_block_vars (0);
3634 free_bb_for_insn ();
3636 timevar_pop (TV_FINAL);
3638 /* Make sure volatile mem refs aren't considered valid operands for
3639 arithmetic insns. We must call this here if this is a nested inline
3640 function, since the above code leaves us in the init_recog state
3641 (from final.c), and the function context push/pop code does not
3642 save/restore volatile_ok.
3644 ??? Maybe it isn't necessary for expand_start_function to call this
3645 anymore if we do it here? */
3647 init_recog_no_volatile ();
3649 /* We're done with this function. Free up memory if we can. */
3650 free_after_parsing (cfun);
3651 if (! DECL_DEFER_OUTPUT (decl))
3653 free_after_compilation (cfun);
3655 /* Clear integrate.c's pointer to the cfun structure we just
3657 DECL_SAVED_INSNS (decl) = 0;
3663 timevar_pop (TV_REST_OF_COMPILATION);
3673 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3674 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3675 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3676 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3677 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3678 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"));
3679 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3681 for (i = ARRAY_SIZE (f_options); i--;)
3683 const char *description = f_options[i].description;
3685 if (description != NULL && *description != 0)
3686 printf (" -f%-21s %s\n",
3687 f_options[i].string, _(description));
3690 printf (_(" -O[number] Set optimization level to [number]\n"));
3691 printf (_(" -Os Optimize for space rather than speed\n"));
3692 for (i = LAST_PARAM; i--;)
3694 const char *description = compiler_params[i].help;
3695 const int length = 21 - strlen (compiler_params[i].option);
3697 if (description != NULL && *description != 0)
3698 printf (" --param %s=<value>%.*s%s\n",
3699 compiler_params[i].option,
3700 length > 0 ? length : 1, " ",
3703 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3704 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3705 printf (_(" -w Suppress warnings\n"));
3706 printf (_(" -W Enable extra warnings\n"));
3708 for (i = ARRAY_SIZE (W_options); i--;)
3710 const char *description = W_options[i].description;
3712 if (description != NULL && *description != 0)
3713 printf (" -W%-21s %s\n",
3714 W_options[i].string, _(description));
3717 printf (_(" -Wunused Enable unused warnings\n"));
3718 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3719 printf (_(" -p Enable function profiling\n"));
3720 printf (_(" -o <file> Place output into <file> \n"));
3722 -G <number> Put global and static data smaller than <number>\n\
3723 bytes into a special section (on some targets)\n"));
3725 for (i = ARRAY_SIZE (debug_args); i--;)
3727 if (debug_args[i].description != NULL)
3728 printf (" -g%-21s %s\n",
3729 debug_args[i].arg, _(debug_args[i].description));
3732 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3733 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3734 printf (_(" -version Display the compiler's version\n"));
3735 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3736 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3737 #if defined INSN_SCHEDULING
3738 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3740 printf (_(" --help Display this information\n"));
3745 /* Display descriptions of language specific options.
3746 If there is no description, note that there is an undocumented option.
3747 If the description is empty, do not display anything. (This allows
3748 options to be deliberately undocumented, for whatever reason).
3749 If the option string is missing, then this is a marker, indicating
3750 that the description string is in fact the name of a language, whose
3751 language specific options are to follow. */
3753 if (ARRAY_SIZE (documented_lang_options) > 1)
3755 printf (_("\nLanguage specific options:\n"));
3757 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3759 const char *description = documented_lang_options[i].description;
3760 const char *option = documented_lang_options[i].option;
3762 if (description == NULL)
3767 printf (_(" %-23.23s [undocumented]\n"), option);
3769 else if (*description == 0)
3771 else if (option == NULL)
3775 (_("\nThere are undocumented %s specific options as well.\n"),
3779 printf (_("\n Options for %s:\n"), description);
3784 printf (" %-23.23s %s\n", option, _(description));
3789 printf (_("\nThere are undocumented %s specific options as well.\n"),
3792 display_target_options ();
3796 display_target_options ()
3799 static bool displayed = false;
3801 /* Avoid double printing for --help --target-help. */
3806 if (ARRAY_SIZE (target_switches) > 1
3807 #ifdef TARGET_OPTIONS
3808 || ARRAY_SIZE (target_options) > 1
3816 printf (_("\nTarget specific options:\n"));
3818 for (i = ARRAY_SIZE (target_switches); i--;)
3820 const char *option = target_switches[i].name;
3821 const char *description = target_switches[i].description;
3823 if (option == NULL || *option == 0)
3825 else if (description == NULL)
3830 printf (_(" -m%-23.23s [undocumented]\n"), option);
3832 else if (*description != 0)
3833 doc += printf (" -m%-23.23s %s\n", option, _(description));
3836 #ifdef TARGET_OPTIONS
3837 for (i = ARRAY_SIZE (target_options); i--;)
3839 const char *option = target_options[i].prefix;
3840 const char *description = target_options[i].description;
3842 if (option == NULL || *option == 0)
3844 else if (description == NULL)
3849 printf (_(" -m%-23.23s [undocumented]\n"), option);
3851 else if (*description != 0)
3852 doc += printf (" -m%-23.23s %s\n", option, _(description));
3858 printf (_("\nThere are undocumented target specific options as well.\n"));
3860 printf (_(" They exist, but they are not documented.\n"));
3865 /* Parse a -d... command line switch. */
3868 decode_d_option (arg)
3877 for (i = 0; i < (int) DFI_MAX; ++i)
3878 dump_file[i].enabled = 1;
3884 flag_print_asm_name = 1;
3887 flag_dump_rtl_in_asm = 1;
3888 flag_print_asm_name = 1;
3891 graph_dump_format = vcg;
3894 rtl_dump_and_exit = 1;
3899 case 'D': /* These are handled by the preprocessor. */
3905 for (i = 0; i < (int) DFI_MAX; ++i)
3906 if (c == dump_file[i].debug_switch)
3908 dump_file[i].enabled = 1;
3913 warning ("unrecognized gcc debugging option: %c", c);
3918 /* Parse a -f... command line switch. ARG is the value after the -f.
3919 It is safe to access 'ARG - 2' to generate the full switch name.
3920 Return the number of strings consumed. */
3923 decode_f_option (arg)
3927 const char *option_value = NULL;
3929 /* Search for the option in the table of binary f options. */
3930 for (j = ARRAY_SIZE (f_options); j--;)
3932 if (!strcmp (arg, f_options[j].string))
3934 *f_options[j].variable = f_options[j].on_value;
3938 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3939 && ! strcmp (arg + 3, f_options[j].string))
3941 *f_options[j].variable = ! f_options[j].on_value;
3946 if (!strcmp (arg, "fast-math"))
3947 set_fast_math_flags (1);
3948 else if (!strcmp (arg, "no-fast-math"))
3949 set_fast_math_flags (0);
3950 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3951 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3954 read_integral_parameter (option_value, arg - 2,
3956 set_param_value ("max-inline-insns", val);
3958 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
3960 if (strcmp (option_value, "global-dynamic") == 0)
3961 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
3962 else if (strcmp (option_value, "local-dynamic") == 0)
3963 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
3964 else if (strcmp (option_value, "initial-exec") == 0)
3965 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
3966 else if (strcmp (option_value, "local-exec") == 0)
3967 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
3969 warning ("`%s': unknown tls-model option", arg - 2);
3971 #ifdef INSN_SCHEDULING
3972 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3973 fix_sched_param ("verbose", option_value);
3975 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3976 fix_register (option_value, 1, 1);
3977 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3978 fix_register (option_value, 0, 1);
3979 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3980 fix_register (option_value, 0, 0);
3981 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3982 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3983 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3985 = read_integral_parameter (option_value, arg - 2, align_functions);
3986 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3987 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3988 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3990 = read_integral_parameter (option_value, arg - 2, align_labels);
3991 else if ((option_value
3992 = skip_leading_substring (arg, "stack-limit-register=")))
3994 int reg = decode_reg_name (option_value);
3996 error ("unrecognized register name `%s'", option_value);
3998 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4000 else if ((option_value
4001 = skip_leading_substring (arg, "stack-limit-symbol=")))
4004 nm = ggc_strdup (option_value);
4005 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4007 else if ((option_value
4008 = skip_leading_substring (arg, "message-length=")))
4009 output_set_maximum_length
4010 (&global_dc->buffer, read_integral_parameter
4011 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4012 else if ((option_value
4013 = skip_leading_substring (arg, "diagnostics-show-location=")))
4015 if (!strcmp (option_value, "once"))
4016 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4017 else if (!strcmp (option_value, "every-line"))
4018 diagnostic_prefixing_rule (global_dc)
4019 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4021 error ("unrecognized option `%s'", arg - 2);
4023 else if (!strcmp (arg, "no-stack-limit"))
4024 stack_limit_rtx = NULL_RTX;
4025 else if (!strcmp (arg, "preprocessed"))
4026 /* Recognize this switch but do nothing. This prevents warnings
4027 about an unrecognized switch if cpplib has not been linked in. */
4035 /* Parse a -W... command line switch. ARG is the value after the -W.
4036 It is safe to access 'ARG - 2' to generate the full switch name.
4037 Return the number of strings consumed. */
4040 decode_W_option (arg)
4043 const char *option_value = NULL;
4046 /* Search for the option in the table of binary W options. */
4048 for (j = ARRAY_SIZE (W_options); j--;)
4050 if (!strcmp (arg, W_options[j].string))
4052 *W_options[j].variable = W_options[j].on_value;
4056 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4057 && ! strcmp (arg + 3, W_options[j].string))
4059 *W_options[j].variable = ! W_options[j].on_value;
4064 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4065 warning ("-Wid-clash-LEN is no longer supported");
4066 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4068 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4070 warn_larger_than = larger_than_size != -1;
4072 else if (!strcmp (arg, "unused"))
4076 else if (!strcmp (arg, "no-unused"))
4086 /* Parse a -g... command line switch. ARG is the value after the -g.
4087 It is safe to access 'ARG - 2' to generate the full switch name.
4088 Return the number of strings consumed. */
4091 decode_g_option (arg)
4094 static unsigned level = 0;
4095 /* A lot of code assumes write_symbols == NO_DEBUG if the
4096 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4097 of what debugging type has been selected). This records the
4098 selected type. It is an error to specify more than one
4100 static enum debug_info_type selected_debug_type = NO_DEBUG;
4101 /* Non-zero if debugging format has been explicitly set.
4102 -g and -ggdb don't explicitly set the debugging format so
4103 -gdwarf -g3 is equivalent to -gdwarf3. */
4104 static int type_explicitly_set_p = 0;
4105 /* Indexed by enum debug_info_type. */
4106 static const char *const debug_type_names[] =
4108 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4111 /* The maximum admissible debug level value. */
4112 static const unsigned max_debug_level = 3;
4114 /* Look up ARG in the table. */
4115 for (da = debug_args; da->arg; da++)
4117 const int da_len = strlen (da->arg);
4119 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4121 enum debug_info_type type = da->debug_type;
4122 const char *p = arg + da_len;
4124 if (*p && ! ISDIGIT (*p))
4127 /* A debug flag without a level defaults to level 2.
4128 Note we do not want to call read_integral_parameter
4129 for that case since it will call atoi which
4132 ??? We may want to generalize the interface to
4133 read_integral_parameter to better handle this case
4134 if this case shows up often. */
4136 level = read_integral_parameter (p, 0, max_debug_level + 1);
4138 level = (level == 0) ? 2 : level;
4140 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4142 error ("use -gdwarf -g%d for DWARF v1, level %d",
4145 error ("use -gdwarf-2 for DWARF v2");
4148 if (level > max_debug_level)
4151 ignoring option `%s' due to invalid debug level specification",
4153 level = debug_info_level;
4156 if (type == NO_DEBUG)
4158 type = PREFERRED_DEBUGGING_TYPE;
4160 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4162 #ifdef DWARF2_DEBUGGING_INFO
4163 type = DWARF2_DEBUG;
4165 #ifdef DBX_DEBUGGING_INFO
4172 if (type == NO_DEBUG)
4173 warning ("`%s': unknown or unsupported -g option", arg - 2);
4175 /* Does it conflict with an already selected type? */
4176 if (type_explicitly_set_p
4177 /* -g/-ggdb don't conflict with anything. */
4178 && da->debug_type != NO_DEBUG
4179 && type != selected_debug_type)
4180 warning ("`%s' ignored, conflicts with `-g%s'",
4181 arg - 2, debug_type_names[(int) selected_debug_type]);
4184 /* If the format has already been set, -g/-ggdb
4185 only change the debug level. */
4186 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4187 /* Don't change debugging type. */
4191 selected_debug_type = type;
4192 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4195 write_symbols = (level == 0
4197 : selected_debug_type);
4198 use_gnu_debug_info_extensions = da->use_extensions_p;
4199 debug_info_level = (enum debug_info_level) level;
4212 /* Decode the first argument in the argv as a language-independent option.
4213 Return the number of strings consumed. */
4216 independent_decode_option (argc, argv)
4220 char *arg = argv[0];
4222 if (arg[0] != '-' || arg[1] == 0)
4234 if (!strcmp (arg, "-help"))
4237 exit_after_options = 1;
4240 if (!strcmp (arg, "-target-help"))
4242 display_target_options ();
4243 exit_after_options = 1;
4246 if (!strcmp (arg, "-version"))
4248 print_version (stderr, "");
4249 exit_after_options = 1;
4252 /* Handle '--param <name>=<value>'. */
4253 if (strcmp (arg, "-param") == 0)
4259 error ("-param option missing argument");
4263 /* Get the '<name>=<value>' parameter. */
4265 /* Look for the `='. */
4266 equal = strchr (arg, '=');
4268 error ("invalid --param option: %s", arg);
4273 /* Zero out the `=' sign so that we get two separate strings. */
4275 /* Figure out what value is specified. */
4276 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4277 if (val != INVALID_PARAM_VAL)
4278 set_param_value (arg, val);
4280 error ("invalid parameter value `%s'", equal + 1);
4295 /* Already been treated in main (). Do nothing. */
4299 set_target_switch (arg + 1);
4303 return decode_f_option (arg + 1);
4306 return decode_g_option (arg + 1);
4309 if (!strcmp (arg, "dumpbase"))
4315 dump_base_name = argv[1];
4320 decode_d_option (arg + 1);
4324 if (!strcmp (arg, "pedantic"))
4326 else if (!strcmp (arg, "pedantic-errors"))
4327 flag_pedantic_errors = pedantic = 1;
4328 else if (arg[1] == 0)
4335 if (!strcmp (arg, "quiet"))
4342 if (!strcmp (arg, "version"))
4350 inhibit_warnings = 1;
4359 /* We save the value of warn_uninitialized, since if they put
4360 -Wuninitialized on the command line, we need to generate a
4361 warning about not using it without also specifying -O. */
4362 if (warn_uninitialized != 1)
4363 warn_uninitialized = 2;
4366 return decode_W_option (arg + 1);
4370 if (!strncmp (arg, "aux-info", 8))
4377 aux_info_file_name = argv[1];
4378 flag_gen_aux_info = 1;
4381 else if (arg[8] == '=')
4383 aux_info_file_name = arg + 9;
4384 flag_gen_aux_info = 1;
4389 else if (!strcmp (arg, "auxbase"))
4395 aux_base_name = argv[1];
4399 else if (!strcmp (arg, "auxbase-strip"))
4406 strip_off_ending (argv[1], strlen (argv[1]));
4408 aux_base_name = argv[1];
4423 asm_file_name = argv[1];
4438 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4443 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4447 if (g_switch_val == -1)
4451 g_switch_set = TRUE;
4452 g_switch_value = g_switch_val;
4462 /* Decode -m switches. */
4463 /* Decode the switch -mNAME. */
4466 set_target_switch (name)
4470 int valid_target_option = 0;
4472 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4473 if (!strcmp (target_switches[j].name, name))
4475 if (target_switches[j].value < 0)
4476 target_flags &= ~-target_switches[j].value;
4478 target_flags |= target_switches[j].value;
4481 if (target_switches[j].value < 0)
4482 target_flags_explicit |= -target_switches[j].value;
4484 target_flags_explicit |= target_switches[j].value;
4486 valid_target_option = 1;
4489 #ifdef TARGET_OPTIONS
4490 if (!valid_target_option)
4491 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4493 int len = strlen (target_options[j].prefix);
4494 if (!strncmp (target_options[j].prefix, name, len))
4496 *target_options[j].variable = name + len;
4497 valid_target_option = 1;
4502 if (!valid_target_option)
4503 error ("invalid option `%s'", name);
4506 /* Print version information to FILE.
4507 Each line begins with INDENT (for the case where FILE is the
4508 assembler output file). */
4511 print_version (file, indent)
4516 #define __VERSION__ "[?]"
4520 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4522 "%s%s%s version %s (%s) compiled by CC.\n"
4524 , indent, *indent != 0 ? " " : "",
4525 lang_hooks.name, version_string, TARGET_NAME,
4526 indent, __VERSION__);
4529 /* Print an option value and return the adjusted position in the line.
4530 ??? We don't handle error returns from fprintf (disk full); presumably
4531 other code will catch a disk full though. */
4534 print_single_switch (file, pos, max, indent, sep, term, type, name)
4537 const char *indent, *sep, *term, *type, *name;
4539 /* The ultrix fprintf returns 0 on success, so compute the result we want
4540 here since we need it for the following test. */
4541 int len = strlen (sep) + strlen (type) + strlen (name);
4546 fprintf (file, "%s", term);
4551 fprintf (file, "%s", indent);
4552 pos = strlen (indent);
4554 fprintf (file, "%s%s%s", sep, type, name);
4559 /* Print active target switches to FILE.
4560 POS is the current cursor position and MAX is the size of a "line".
4561 Each line begins with INDENT and ends with TERM.
4562 Each switch is separated from the next by SEP. */
4565 print_switch_values (file, pos, max, indent, sep, term)
4568 const char *indent, *sep, *term;
4573 /* Print the options as passed. */
4575 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4576 _("options passed: "), "");
4578 for (p = &save_argv[1]; *p != NULL; p++)
4582 if (strcmp (*p, "-o") == 0)
4588 if (strcmp (*p, "-quiet") == 0)
4590 if (strcmp (*p, "-version") == 0)
4595 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4598 fprintf (file, "%s", term);
4600 /* Print the -f and -m options that have been enabled.
4601 We don't handle language specific options but printing argv
4604 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4605 _("options enabled: "), "");
4607 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4608 if (*f_options[j].variable == f_options[j].on_value)
4609 pos = print_single_switch (file, pos, max, indent, sep, term,
4610 "-f", f_options[j].string);
4612 /* Print target specific options. */
4614 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4615 if (target_switches[j].name[0] != '\0'
4616 && target_switches[j].value > 0
4617 && ((target_switches[j].value & target_flags)
4618 == target_switches[j].value))
4620 pos = print_single_switch (file, pos, max, indent, sep, term,
4621 "-m", target_switches[j].name);
4624 #ifdef TARGET_OPTIONS
4625 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4626 if (*target_options[j].variable != NULL)
4629 sprintf (prefix, "-m%s", target_options[j].prefix);
4630 pos = print_single_switch (file, pos, max, indent, sep, term,
4631 prefix, *target_options[j].variable);
4635 fprintf (file, "%s", term);
4638 /* Open assembly code output file. Do this even if -fsyntax-only is
4639 on, because then the driver will have provided the name of a
4640 temporary file or bit bucket for us. NAME is the file specified on
4641 the command line, possibly NULL. */
4643 init_asm_output (name)
4646 if (name == NULL && asm_file_name == 0)
4647 asm_out_file = stdout;
4650 if (asm_file_name == 0)
4652 int len = strlen (dump_base_name);
4653 char *dumpname = (char *) xmalloc (len + 6);
4654 memcpy (dumpname, dump_base_name, len + 1);
4655 strip_off_ending (dumpname, len);
4656 strcat (dumpname, ".s");
4657 asm_file_name = dumpname;
4659 if (!strcmp (asm_file_name, "-"))
4660 asm_out_file = stdout;
4662 asm_out_file = fopen (asm_file_name, "w");
4663 if (asm_out_file == 0)
4664 fatal_io_error ("can't open %s for writing", asm_file_name);
4667 #ifdef IO_BUFFER_SIZE
4668 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4669 _IOFBF, IO_BUFFER_SIZE);
4672 if (!flag_syntax_only)
4674 #ifdef ASM_FILE_START
4675 ASM_FILE_START (asm_out_file);
4678 #ifdef ASM_COMMENT_START
4679 if (flag_verbose_asm)
4681 /* Print the list of options in effect. */
4682 print_version (asm_out_file, ASM_COMMENT_START);
4683 print_switch_values (asm_out_file, 0, MAX_LINE,
4684 ASM_COMMENT_START, " ", "\n");
4685 /* Add a blank line here so it appears in assembler output but not
4687 fprintf (asm_out_file, "\n");
4693 /* Initialization of the front end environment, before command line
4694 options are parsed. Signal handlers, internationalization etc.
4695 ARGV0 is main's argv[0]. */
4697 general_init (argv0)
4702 p = argv0 + strlen (argv0);
4703 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4707 xmalloc_set_program_name (progname);
4711 gcc_init_libintl ();
4713 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4715 signal (SIGSEGV, crash_signal);
4718 signal (SIGILL, crash_signal);
4721 signal (SIGBUS, crash_signal);
4724 signal (SIGABRT, crash_signal);
4726 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4727 signal (SIGIOT, crash_signal);
4730 signal (SIGFPE, crash_signal);
4733 /* Initialize the diagnostics reporting machinery, so option parsing
4734 can give warnings and errors. */
4735 diagnostic_initialize (global_dc);
4737 /* Initialize the garbage-collector, string pools and tree type hash
4744 /* Parse command line options and set default flag values, called
4745 after language-independent option-independent initialization. Do
4746 minimal options processing. Outputting diagnostics is OK, but GC
4747 and identifier hashtables etc. are not initialized yet.
4749 Return nonzero to suppress compiler back end initialization. */
4751 parse_options_and_default_flags (argc, argv)
4757 /* Save in case md file wants to emit args as a comment. */
4761 /* Initialize register usage now so switches may override. */
4764 /* Register the language-independent parameters. */
4765 add_params (lang_independent_params, LAST_PARAM);
4767 /* Perform language-specific options initialization. */
4768 (*lang_hooks.init_options) ();
4770 /* Scan to see what optimization level has been specified. That will
4771 determine the default value of many flags. */
4772 for (i = 1; i < argc; i++)
4774 if (!strcmp (argv[i], "-O"))
4779 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4781 /* Handle -Os, -O2, -O3, -O69, ... */
4782 char *p = &argv[i][2];
4784 if ((p[0] == 's') && (p[1] == 0))
4788 /* Optimizing for size forces optimize to be 2. */
4793 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4794 if (optimize_val != -1)
4796 optimize = optimize_val;
4805 flag_merge_constants = 0;
4811 flag_thread_jumps = 1;
4813 flag_delayed_branch = 1;
4815 #ifdef CAN_DEBUG_WITHOUT_FP
4816 flag_omit_frame_pointer = 1;
4818 flag_guess_branch_prob = 1;
4819 flag_cprop_registers = 1;
4820 flag_loop_optimize = 1;
4821 flag_crossjumping = 1;
4822 flag_if_conversion = 1;
4823 flag_if_conversion2 = 1;
4828 flag_optimize_sibling_calls = 1;
4829 flag_cse_follow_jumps = 1;
4830 flag_cse_skip_blocks = 1;
4832 flag_expensive_optimizations = 1;
4833 flag_strength_reduce = 1;
4834 flag_rerun_cse_after_loop = 1;
4835 flag_rerun_loop_opt = 1;
4836 flag_caller_saves = 1;
4839 #ifdef INSN_SCHEDULING
4840 flag_schedule_insns = 1;
4841 flag_schedule_insns_after_reload = 1;
4844 flag_strict_aliasing = 1;
4845 flag_delete_null_pointer_checks = 1;
4846 flag_reorder_blocks = 1;
4847 flag_reorder_functions = 1;
4852 flag_inline_functions = 1;
4853 flag_rename_registers = 1;
4856 if (optimize < 2 || optimize_size)
4861 align_functions = 1;
4863 /* Don't reorder blocks when optimizing for size because extra
4864 jump insns may be created; also barrier may create extra padding.
4866 More correctly we should have a block reordering mode that tried
4867 to minimize the combined size of all the jumps. This would more
4868 or less automatically remove extra jumps, but would also try to
4869 use more short jumps instead of long jumps. */
4870 flag_reorder_blocks = 0;
4873 /* Initialize whether `char' is signed. */
4874 flag_signed_char = DEFAULT_SIGNED_CHAR;
4875 #ifdef DEFAULT_SHORT_ENUMS
4876 /* Initialize how much space enums occupy, by default. */
4877 flag_short_enums = DEFAULT_SHORT_ENUMS;
4880 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4883 set_target_switch ("");
4885 /* Unwind tables are always present in an ABI-conformant IA-64
4886 object file, so the default should be ON. */
4887 #ifdef IA64_UNWIND_INFO
4888 flag_unwind_tables = IA64_UNWIND_INFO;
4891 #ifdef OPTIMIZATION_OPTIONS
4892 /* Allow default optimizations to be specified on a per-machine basis. */
4893 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4896 /* Perform normal command line switch decoding. */
4897 for (i = 1; i < argc;)
4900 int indep_processed;
4902 /* Give the language a chance to decode the option for itself. */
4903 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4905 if (lang_processed >= 0)
4906 /* Now see if the option also has a language independent meaning.
4907 Some options are both language specific and language independent,
4909 indep_processed = independent_decode_option (argc - i, argv + i);
4912 lang_processed = -lang_processed;
4913 indep_processed = 0;
4916 if (lang_processed || indep_processed)
4917 i += MAX (lang_processed, indep_processed);
4920 const char *option = NULL;
4921 const char *lang = NULL;
4924 /* It is possible that the command line switch is not valid for the
4925 current language, but it is valid for another language. In order
4926 to be compatible with previous versions of the compiler (which
4927 did not issue an error message in this case) we check for this
4928 possibility here. If we do find a match, then if extra_warnings
4929 is set we generate a warning message, otherwise we will just
4930 ignore the option. */
4931 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4933 option = documented_lang_options[j].option;
4936 lang = documented_lang_options[j].description;
4937 else if (! strncmp (argv[i], option, strlen (option)))
4941 if (j != ARRAY_SIZE (documented_lang_options))
4945 warning ("ignoring command line option '%s'", argv[i]);
4948 ("(it is valid for %s but not the selected language)",
4952 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4953 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4955 error ("unrecognized option `%s'", argv[i]);
4961 if (flag_no_inline == 2)
4964 flag_really_no_inline = flag_no_inline;
4966 /* Set flag_no_inline before the post_options () hook. The C front
4967 ends use it to determine tree inlining defaults. FIXME: such
4968 code should be lang-independent when all front ends use tree
4969 inlining, in which case it, and this condition, should be moved
4970 to the top of process_options() instead. */
4973 /* Inlining does not work if not optimizing,
4974 so force it not to be done. */
4978 /* The c_decode_option function and decode_option hook set
4979 this to `2' if -Wall is used, so we can avoid giving out
4980 lots of errors for people who don't realize what -Wall does. */
4981 if (warn_uninitialized == 1)
4982 warning ("-Wuninitialized is not supported without -O");
4985 if (flag_really_no_inline == 2)
4986 flag_really_no_inline = flag_no_inline;
4989 /* Process the options that have been parsed. */
4993 #ifdef OVERRIDE_OPTIONS
4994 /* Some machines may reject certain combinations of options. */
4998 /* Set up the align_*_log variables, defaulting them to 1 if they
4999 were still unset. */
5000 if (align_loops <= 0) align_loops = 1;
5001 if (align_loops_max_skip > align_loops || !align_loops)
5002 align_loops_max_skip = align_loops - 1;
5003 align_loops_log = floor_log2 (align_loops * 2 - 1);
5004 if (align_jumps <= 0) align_jumps = 1;
5005 if (align_jumps_max_skip > align_jumps || !align_jumps)
5006 align_jumps_max_skip = align_jumps - 1;
5007 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5008 if (align_labels <= 0) align_labels = 1;
5009 align_labels_log = floor_log2 (align_labels * 2 - 1);
5010 if (align_labels_max_skip > align_labels || !align_labels)
5011 align_labels_max_skip = align_labels - 1;
5012 if (align_functions <= 0) align_functions = 1;
5013 align_functions_log = floor_log2 (align_functions * 2 - 1);
5015 /* Unrolling all loops implies that standard loop unrolling must also
5017 if (flag_unroll_all_loops)
5018 flag_unroll_loops = 1;
5019 /* Loop unrolling requires that strength_reduction be on also. Silently
5020 turn on strength reduction here if it isn't already on. Also, the loop
5021 unrolling code assumes that cse will be run after loop, so that must
5022 be turned on also. */
5023 if (flag_unroll_loops)
5025 flag_strength_reduce = 1;
5026 flag_rerun_cse_after_loop = 1;
5029 if (flag_non_call_exceptions)
5030 flag_asynchronous_unwind_tables = 1;
5031 if (flag_asynchronous_unwind_tables)
5032 flag_unwind_tables = 1;
5034 /* Warn about options that are not supported on this machine. */
5035 #ifndef INSN_SCHEDULING
5036 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5037 warning ("instruction scheduling not supported on this target machine");
5040 if (flag_delayed_branch)
5041 warning ("this target machine does not have delayed branches");
5044 user_label_prefix = USER_LABEL_PREFIX;
5045 if (flag_leading_underscore != -1)
5047 /* If the default prefix is more complicated than "" or "_",
5048 issue a warning and ignore this option. */
5049 if (user_label_prefix[0] == 0 ||
5050 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5052 user_label_prefix = flag_leading_underscore ? "_" : "";
5055 warning ("-f%sleading-underscore not supported on this target machine",
5056 flag_leading_underscore ? "" : "no-");
5059 /* If we are in verbose mode, write out the version and maybe all the
5060 option flags in use. */
5063 print_version (stderr, "");
5065 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5071 if (flag_syntax_only)
5073 write_symbols = NO_DEBUG;
5077 /* Now we know write_symbols, set up the debug hooks based on it.
5078 By default we do nothing for debug output. */
5079 #if defined(DBX_DEBUGGING_INFO)
5080 if (write_symbols == DBX_DEBUG)
5081 debug_hooks = &dbx_debug_hooks;
5083 #if defined(XCOFF_DEBUGGING_INFO)
5084 if (write_symbols == XCOFF_DEBUG)
5085 debug_hooks = &xcoff_debug_hooks;
5087 #ifdef SDB_DEBUGGING_INFO
5088 if (write_symbols == SDB_DEBUG)
5089 debug_hooks = &sdb_debug_hooks;
5091 #ifdef DWARF_DEBUGGING_INFO
5092 if (write_symbols == DWARF_DEBUG)
5093 debug_hooks = &dwarf_debug_hooks;
5095 #ifdef DWARF2_DEBUGGING_INFO
5096 if (write_symbols == DWARF2_DEBUG)
5097 debug_hooks = &dwarf2_debug_hooks;
5099 #ifdef VMS_DEBUGGING_INFO
5100 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5101 debug_hooks = &vmsdbg_debug_hooks;
5104 /* If auxiliary info generation is desired, open the output file.
5105 This goes in the same directory as the source file--unlike
5106 all the other output files. */
5107 if (flag_gen_aux_info)
5109 aux_info_file = fopen (aux_info_file_name, "w");
5110 if (aux_info_file == 0)
5111 fatal_io_error ("can't open %s", aux_info_file_name);
5114 if (! targetm.have_named_sections)
5116 if (flag_function_sections)
5118 warning ("-ffunction-sections not supported for this target");
5119 flag_function_sections = 0;
5121 if (flag_data_sections)
5123 warning ("-fdata-sections not supported for this target");
5124 flag_data_sections = 0;
5128 if (flag_function_sections && profile_flag)
5130 warning ("-ffunction-sections disabled; it makes profiling impossible");
5131 flag_function_sections = 0;
5134 #ifndef HAVE_prefetch
5135 if (flag_prefetch_loop_arrays)
5137 warning ("-fprefetch-loop-arrays not supported for this target");
5138 flag_prefetch_loop_arrays = 0;
5141 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5143 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5144 flag_prefetch_loop_arrays = 0;
5148 /* This combination of options isn't handled for i386 targets and doesn't
5149 make much sense anyway, so don't allow it. */
5150 if (flag_prefetch_loop_arrays && optimize_size)
5152 warning ("-fprefetch-loop-arrays is not supported with -Os");
5153 flag_prefetch_loop_arrays = 0;
5156 #ifndef OBJECT_FORMAT_ELF
5157 if (flag_function_sections && write_symbols != NO_DEBUG)
5158 warning ("-ffunction-sections may affect debugging on some targets");
5161 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5162 if (flag_signaling_nans)
5163 flag_trapping_math = 1;
5166 /* Initialize the compiler back end. */
5170 /* init_emit_once uses reg_raw_mode and therefore must be called
5171 after init_regs which initialized reg_raw_mode. */
5173 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5174 || debug_info_level == DINFO_LEVEL_VERBOSE
5175 #ifdef VMS_DEBUGGING_INFO
5176 /* Enable line number info for traceback */
5177 || debug_info_level > DINFO_LEVEL_NONE
5179 || flag_test_coverage
5180 || warn_notreached);
5181 init_fake_stack_mems ();
5185 init_function_once ();
5186 init_varasm_once ();
5188 /* The following initialization functions need to generate rtl, so
5189 provide a dummy function context for them. */
5190 init_dummy_function_start ();
5192 if (flag_caller_saves)
5193 init_caller_save ();
5194 expand_dummy_function_end ();
5197 /* Language-dependent initialization. Returns nonzero on success. */
5199 lang_dependent_init (name)
5202 if (dump_base_name == 0)
5203 dump_base_name = name ? name : "gccdump";
5205 /* Front-end initialization. This hook can assume that GC,
5206 identifier hashes etc. are set up, but debug initialization is
5207 not done yet. This routine must return the original filename
5208 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5209 name = (*lang_hooks.init) (name);
5213 /* Is this duplication necessary? */
5214 name = ggc_strdup (name);
5215 main_input_filename = input_filename = name;
5216 init_asm_output (name);
5218 /* These create various _DECL nodes, so need to be called after the
5219 front end is initialized. */
5223 /* The following initialization functions need to generate rtl, so
5224 provide a dummy function context for them. */
5225 init_dummy_function_start ();
5227 expand_dummy_function_end ();
5229 /* Put an entry on the input file stack for the main input file. */
5230 push_srcloc (input_filename, 0);
5232 /* If dbx symbol table desired, initialize writing it and output the
5233 predefined types. */
5234 timevar_push (TV_SYMOUT);
5236 #ifdef DWARF2_UNWIND_INFO
5237 if (dwarf2out_do_frame ())
5238 dwarf2out_frame_init ();
5241 /* Now we have the correct original filename, we can initialize
5243 (*debug_hooks->init) (name);
5245 timevar_pop (TV_SYMOUT);
5250 /* Clean up: close opened files, etc. */
5255 /* Close the dump files. */
5256 if (flag_gen_aux_info)
5258 fclose (aux_info_file);
5260 unlink (aux_info_file_name);
5263 /* Close non-debugging input and output files. Take special care to note
5264 whether fclose returns an error, since the pages might still be on the
5265 buffer chain while the file is open. */
5269 if (ferror (asm_out_file) != 0)
5270 fatal_io_error ("error writing to %s", asm_file_name);
5271 if (fclose (asm_out_file) != 0)
5272 fatal_io_error ("error closing %s", asm_file_name);
5275 /* Do whatever is necessary to finish printing the graphs. */
5276 if (graph_dump_format != no_graph)
5280 for (i = 0; i < (int) DFI_MAX; ++i)
5281 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5286 sprintf (seq, DUMPFILE_FORMAT, i);
5287 suffix = concat (seq, dump_file[i].extension, NULL);
5288 finish_graph_dump_file (dump_base_name, suffix);
5295 ggc_print_statistics ();
5296 stringpool_statistics ();
5297 dump_tree_statistics ();
5300 /* Free up memory for the benefit of leak detectors. */
5303 /* Language-specific end of compilation actions. */
5304 (*lang_hooks.finish) ();
5307 /* Initialize the compiler, and compile the input file. */
5311 /* All command line options have been parsed; allow the front end to
5312 perform consistency checks, etc. */
5313 bool no_backend = (*lang_hooks.post_options) ();
5315 /* The bulk of command line switch processing. */
5318 /* If an error has already occurred, give up. */
5326 char *name = xstrdup (lbasename (filename));
5328 aux_base_name = name;
5329 strip_off_ending (name, strlen (name));
5332 aux_base_name = "gccaux";
5334 /* We cannot start timing until after options are processed since that
5335 says if we run timers or not. */
5337 timevar_start (TV_TOTAL);
5339 /* Set up the back-end if requested. */
5343 /* Language-dependent initialization. Returns true on success. */
5344 if (lang_dependent_init (filename))
5349 /* Stop timing and print the times. */
5350 timevar_stop (TV_TOTAL);
5351 timevar_print (stderr);
5354 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5355 Decode command args, then call compile_file.
5356 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5357 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5359 It is not safe to call this function more than once. */
5362 toplev_main (argc, argv)
5366 /* Initialization of GCC's environment, and diagnostics. */
5367 general_init (argv[0]);
5369 /* Parse the options and do minimal processing; basically just
5370 enough to default flags appropriately. */
5371 parse_options_and_default_flags (argc, argv);
5373 /* Exit early if we can (e.g. -help). */
5374 if (!exit_after_options)
5377 if (errorcount || sorrycount)
5378 return (FATAL_EXIT_CODE);
5380 return (SUCCESS_EXIT_CODE);