1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
80 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
81 #include "dwarf2out.h"
84 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
88 #ifdef SDB_DEBUGGING_INFO
92 #ifdef XCOFF_DEBUGGING_INFO
93 #include "xcoffout.h" /* Needed for external data
94 declarations for e.g. AIX 4.x. */
97 /* Carry information from ASM_DECLARE_OBJECT_NAME
98 to ASM_FINISH_DECLARE_OBJECT. */
100 extern int size_directive_output;
101 extern tree last_assemble_variable_decl;
103 extern void reg_alloc PARAMS ((void));
105 static void general_init PARAMS ((char *));
106 static void parse_options_and_default_flags PARAMS ((int, char **));
107 static void do_compile PARAMS ((int));
108 static void process_options PARAMS ((void));
109 static void backend_init PARAMS ((void));
110 static int lang_dependent_init PARAMS ((const char *));
111 static void init_asm_output PARAMS ((const char *));
112 static void finalize PARAMS ((void));
114 static void set_target_switch PARAMS ((const char *));
116 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
117 static void setup_core_dumping PARAMS ((void));
118 static void compile_file PARAMS ((void));
119 static void display_help PARAMS ((void));
120 static void display_target_options PARAMS ((void));
122 static void decode_d_option PARAMS ((const char *));
123 static int decode_f_option PARAMS ((const char *));
124 static int decode_W_option PARAMS ((const char *));
125 static int decode_g_option PARAMS ((const char *));
126 static unsigned int independent_decode_option PARAMS ((int, char **));
128 static void print_version PARAMS ((FILE *, const char *));
129 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
130 const char *, const char *,
131 const char *, const char *));
132 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
133 const char *, const char *));
135 /* Nonzero to dump debug info whilst parsing (-dy option). */
136 static int set_yydebug;
138 /* Length of line when printing switch values. */
141 /* Name of program invoked, sans directories. */
143 const char *progname;
145 /* Copy of arguments to toplev_main. */
149 /* Name of current original source file (what was input to cpp).
150 This comes from each #-command in the actual input. */
152 const char *input_filename;
154 /* Name of top-level original source file (what was input to cpp).
155 This comes from the #-command at the beginning of the actual input.
156 If there isn't any there, then this is the cc1 input file name. */
158 const char *main_input_filename;
160 /* Current line number in real source file. */
164 /* Nonzero if it is unsafe to create any new pseudo registers. */
167 /* Stack of currently pending input files. */
169 struct file_stack *input_file_stack;
171 /* Incremented on each change to input_file_stack. */
172 int input_file_stack_tick;
174 /* Name to use as base of names for dump output files. */
176 const char *dump_base_name;
178 /* Name to use as a base for auxiliary output files. */
180 static const char *aux_base_name;
182 /* Format to use to print dumpfile index value */
183 #ifndef DUMPFILE_FORMAT
184 #define DUMPFILE_FORMAT ".%02d."
187 /* Bit flags that specify the machine subtype we are compiling for.
188 Bits are tested using macros TARGET_... defined in the tm.h file
189 and set by `-m...' switches. Must be defined in rtlanal.c. */
191 extern int target_flags;
193 /* A mask of target_flags that includes bit X if X was set or cleared
194 on the command line. */
196 int target_flags_explicit;
198 /* Debug hooks - dependent upon command line options. */
200 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
202 /* Describes a dump file. */
204 struct dump_file_info
206 /* The unique extension to apply, e.g. ".jump". */
207 const char *const extension;
209 /* The -d<c> character that enables this dump file. */
210 char const debug_switch;
212 /* True if there is a corresponding graph dump file. */
213 char const graph_dump_p;
215 /* True if the user selected this dump. */
218 /* True if the files have been initialized (ie truncated). */
222 /* Enumerate the extant dump files. */
266 /* Describes all the dump files. Should be kept in order of the
267 pass and in sync with dump_file_index above.
269 Remaining -d letters:
275 static struct dump_file_info dump_file[DFI_MAX] =
277 { "rtl", 'r', 0, 0, 0 },
278 { "sibling", 'i', 0, 0, 0 },
279 { "eh", 'h', 0, 0, 0 },
280 { "jump", 'j', 0, 0, 0 },
281 { "ssa", 'e', 1, 0, 0 },
282 { "ssaccp", 'W', 1, 0, 0 },
283 { "ssadce", 'X', 1, 0, 0 },
284 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
285 { "null", 'u', 0, 0, 0 },
286 { "cse", 's', 0, 0, 0 },
287 { "addressof", 'F', 0, 0, 0 },
288 { "gcse", 'G', 1, 0, 0 },
289 { "loop", 'L', 1, 0, 0 },
290 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
291 { "cfg", 'f', 1, 0, 0 },
292 { "bp", 'b', 1, 0, 0 },
293 { "ce1", 'C', 1, 0, 0 },
294 { "tracer", 'T', 1, 0, 0 },
295 { "loop2", 'L', 1, 0, 0 },
296 { "cse2", 't', 1, 0, 0 },
297 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
298 { "combine", 'c', 1, 0, 0 },
299 { "ce2", 'C', 1, 0, 0 },
300 { "regmove", 'N', 1, 0, 0 },
301 { "sched", 'S', 1, 0, 0 },
302 { "lreg", 'l', 1, 0, 0 },
303 { "greg", 'g', 1, 0, 0 },
304 { "postreload", 'o', 1, 0, 0 },
305 { "flow2", 'w', 1, 0, 0 },
306 { "peephole2", 'z', 1, 0, 0 },
307 { "rnreg", 'n', 1, 0, 0 },
308 { "ce3", 'E', 1, 0, 0 },
309 { "bbro", 'B', 1, 0, 0 },
310 { "sched2", 'R', 1, 0, 0 },
311 { "stack", 'k', 1, 0, 0 },
312 { "mach", 'M', 1, 0, 0 },
313 { "dbr", 'd', 0, 0, 0 },
316 static int open_dump_file PARAMS ((enum dump_file_index, tree));
317 static void close_dump_file PARAMS ((enum dump_file_index,
318 void (*) (FILE *, rtx), rtx));
320 /* Other flags saying which kinds of debugging dump have been requested. */
322 int rtl_dump_and_exit;
323 int flag_print_asm_name;
324 static int version_flag;
325 static const char *filename;
326 enum graph_dump_types graph_dump_format;
328 /* Name for output file of assembly code, specified with -o. */
332 /* Value of the -G xx switch, and whether it was passed or not. */
336 /* Type(s) of debugging information we are producing (if any).
337 See flags.h for the definitions of the different possible
338 types of debugging information. */
339 enum debug_info_type write_symbols = NO_DEBUG;
341 /* Level of debugging information we are producing. See flags.h
342 for the definitions of the different possible levels. */
343 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
345 /* Nonzero means use GNU-only extensions in the generated symbolic
346 debugging information. */
347 /* Currently, this only has an effect when write_symbols is set to
348 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
349 int use_gnu_debug_info_extensions = 0;
351 /* Nonzero means do optimizations. -O.
352 Particular numeric values stand for particular amounts of optimization;
353 thus, -O2 stores 2 here. However, the optimizations beyond the basic
354 ones are not controlled directly by this variable. Instead, they are
355 controlled by individual `flag_...' variables that are defaulted
356 based on this variable. */
360 /* Nonzero means optimize for size. -Os.
361 The only valid values are zero and nonzero. When optimize_size is
362 nonzero, optimize defaults to 2, but certain individual code
363 bloating optimizations are disabled. */
365 int optimize_size = 0;
367 /* Nonzero if we should exit after parsing options. */
368 static int exit_after_options = 0;
370 /* The FUNCTION_DECL for the function currently being compiled,
371 or 0 if between functions. */
372 tree current_function_decl;
374 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
376 tree current_function_func_begin_label;
378 /* Nonzero if doing dwarf2 duplicate elimination. */
380 int flag_eliminate_dwarf2_dups = 0;
382 /* Nonzero if doing unused type elimination. */
384 int flag_eliminate_unused_debug_types = 1;
386 /* Nonzero if generating code to do profiling. */
388 int profile_flag = 0;
390 /* Nonzero if generating code to profile program flow graph arcs. */
392 int profile_arc_flag = 0;
394 /* Nonzero if generating info for gcov to calculate line test coverage. */
396 int flag_test_coverage = 0;
398 /* Nonzero indicates that branch taken probabilities should be calculated. */
400 int flag_branch_probabilities = 0;
402 /* Nonzero if basic blocks should be reordered. */
404 int flag_reorder_blocks = 0;
406 /* Nonzero if functions should be reordered. */
408 int flag_reorder_functions = 0;
410 /* Nonzero if registers should be renamed. */
412 int flag_rename_registers = 0;
413 int flag_cprop_registers = 0;
415 /* Nonzero for -pedantic switch: warn about anything
416 that standard spec forbids. */
420 /* Temporarily suppress certain warnings.
421 This is set while reading code from a system header file. */
423 int in_system_header = 0;
425 /* Don't print functions as they are compiled. -quiet. */
429 /* Print times taken by the various passes. -ftime-report. */
433 /* Print memory still in use at end of compilation (which may have little
434 to do with peak memory consumption). -fmem-report. */
438 /* Nonzero means to collect statistics which might be expensive
439 and to print them when we are done. */
440 int flag_detailed_statistics = 0;
445 /* Nonzero means `char' should be signed. */
447 int flag_signed_char;
449 /* Nonzero means give an enum type only as many bytes as it needs. */
451 int flag_short_enums;
453 /* Nonzero for -fcaller-saves: allocate values in regs that need to
454 be saved across function calls, if that produces overall better code.
455 Optional now, so people can test it. */
457 #ifdef DEFAULT_CALLER_SAVES
458 int flag_caller_saves = 1;
460 int flag_caller_saves = 0;
463 /* Nonzero if structures and unions should be returned in memory.
465 This should only be defined if compatibility with another compiler or
466 with an ABI is needed, because it results in slower code. */
468 #ifndef DEFAULT_PCC_STRUCT_RETURN
469 #define DEFAULT_PCC_STRUCT_RETURN 1
472 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
474 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
476 /* Nonzero for -fforce-mem: load memory value into a register
477 before arithmetic on it. This makes better cse but slower compilation. */
479 int flag_force_mem = 0;
481 /* Nonzero for -fforce-addr: load memory address into a register before
482 reference to memory. This makes better cse but slower compilation. */
484 int flag_force_addr = 0;
486 /* Nonzero for -fdefer-pop: don't pop args after each function call;
487 instead save them up to pop many calls' args with one insns. */
489 int flag_defer_pop = 0;
491 /* Nonzero for -ffloat-store: don't allocate floats and doubles
492 in extended-precision registers. */
494 int flag_float_store = 0;
496 /* Nonzero for -fcse-follow-jumps:
497 have cse follow jumps to do a more extensive job. */
499 int flag_cse_follow_jumps;
501 /* Nonzero for -fcse-skip-blocks:
502 have cse follow a branch around a block. */
503 int flag_cse_skip_blocks;
505 /* Nonzero for -fexpensive-optimizations:
506 perform miscellaneous relatively-expensive optimizations. */
507 int flag_expensive_optimizations;
509 /* Nonzero for -fthread-jumps:
510 have jump optimize output of loop. */
512 int flag_thread_jumps;
514 /* Nonzero enables strength-reduction in loop.c. */
516 int flag_strength_reduce = 0;
518 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
519 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
520 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
523 int flag_old_unroll_loops;
525 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
526 This is generally not a win. */
528 int flag_old_unroll_all_loops;
530 /* Enables unrolling of simple loops in loop-unroll.c. */
531 int flag_unroll_loops;
533 /* Enables unrolling of all loops in loop-unroll.c. */
534 int flag_unroll_all_loops;
536 /* Nonzero enables loop peeling. */
539 /* Nonzero enables loop unswitching. */
540 int flag_unswitch_loops;
542 /* Nonzero enables prefetch optimizations for arrays in loops. */
544 int flag_prefetch_loop_arrays;
546 /* Nonzero forces all invariant computations in loops to be moved
549 int flag_move_all_movables = 0;
551 /* Nonzero forces all general induction variables in loops to be
554 int flag_reduce_all_givs = 0;
556 /* Nonzero to perform full register move optimization passes. This is the
559 int flag_regmove = 0;
561 /* Nonzero for -fwritable-strings:
562 store string constants in data segment and don't uniquize them. */
564 int flag_writable_strings = 0;
566 /* Nonzero means don't put addresses of constant functions in registers.
567 Used for compiling the Unix kernel, where strange substitutions are
568 done on the assembly output. */
570 int flag_no_function_cse = 0;
572 /* Nonzero for -fomit-frame-pointer:
573 don't make a frame pointer in simple functions that don't require one. */
575 int flag_omit_frame_pointer = 0;
577 /* Nonzero means place each function into its own section on those platforms
578 which support arbitrary section names and unlimited numbers of sections. */
580 int flag_function_sections = 0;
582 /* ... and similar for data. */
584 int flag_data_sections = 0;
586 /* Nonzero to inhibit use of define_optimization peephole opts. */
588 int flag_no_peephole = 0;
590 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
592 int flag_optimize_sibling_calls = 0;
594 /* Nonzero means the front end generally wants `errno' maintained by math
595 operations, like built-in SQRT. */
597 int flag_errno_math = 1;
599 /* Nonzero means that unsafe floating-point math optimizations are allowed
600 for the sake of speed. IEEE compliance is not guaranteed, and operations
601 are allowed to assume that their arguments and results are "normal"
602 (e.g., nonnegative for SQRT). */
604 int flag_unsafe_math_optimizations = 0;
606 /* Nonzero means that no NaNs or +-Infs are expected. */
608 int flag_finite_math_only = 0;
610 /* Zero means that floating-point math operations cannot generate a
611 (user-visible) trap. This is the case, for example, in nonstop
612 IEEE 754 arithmetic. Trapping conditions include division by zero,
613 overflow, underflow, invalid and inexact, but does not include
614 operations on signaling NaNs (see below). */
616 int flag_trapping_math = 1;
618 /* Nonzero means disable transformations observable by signaling NaNs.
619 This option implies that any operation on a IEEE signaling NaN can
620 generate a (user-visible) trap. */
622 int flag_signaling_nans = 0;
624 /* 0 means straightforward implementation of complex divide acceptable.
625 1 means wide ranges of inputs must work for complex divide.
626 2 means C99-like requirements for complex divide (not yet implemented). */
628 int flag_complex_divide_method = 0;
630 /* Nonzero means just do syntax checking; don't output anything. */
632 int flag_syntax_only = 0;
634 /* Nonzero means perform loop optimizer. */
636 static int flag_loop_optimize;
638 /* Nonzero means perform crossjumping. */
640 static int flag_crossjumping;
642 /* Nonzero means perform if conversion. */
644 static int flag_if_conversion;
646 /* Nonzero means perform if conversion after reload. */
648 static int flag_if_conversion2;
650 /* Nonzero means to use global dataflow analysis to eliminate
651 useless null pointer tests. */
653 static int flag_delete_null_pointer_checks;
655 /* Nonzero means perform global CSE. */
659 /* Nonzero means to do the enhanced load motion during gcse, which trys
660 to hoist loads by not killing them when a store to the same location
663 int flag_gcse_lm = 1;
665 /* Nonzero means to perform store motion after gcse, which will try to
666 move stores closer to the exit block. Its not very effective without
669 int flag_gcse_sm = 1;
671 /* Nonzero means to rerun cse after loop optimization. This increases
672 compilation time about 20% and picks up a few more common expressions. */
674 static int flag_rerun_cse_after_loop;
676 /* Nonzero means to run loop optimizations twice. */
678 int flag_rerun_loop_opt;
680 /* Nonzero for -finline-functions: ok to inline functions that look like
681 good inline candidates. */
683 int flag_inline_functions;
685 /* Nonzero for -fkeep-inline-functions: even if we make a function
686 go inline everywhere, keep its definition around for debugging
689 int flag_keep_inline_functions;
691 /* Nonzero means that functions will not be inlined. */
693 int flag_no_inline = 2;
695 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
696 not just because the tree inliner turned us off. */
698 int flag_really_no_inline = 2;
700 /* Nonzero means that we should emit static const variables
701 regardless of whether or not optimization is turned on. */
703 int flag_keep_static_consts = 1;
705 /* Nonzero means we should be saving declaration info into a .X file. */
707 int flag_gen_aux_info = 0;
709 /* Specified name of aux-info file. */
711 static char *aux_info_file_name;
713 /* Nonzero means make the text shared if supported. */
715 int flag_shared_data;
717 /* Nonzero means schedule into delayed branch slots if supported. */
719 int flag_delayed_branch;
721 /* Nonzero if we are compiling pure (sharable) code.
722 Value is 1 if we are doing "small" pic; value is 2 if we're doing
727 /* Set to the default thread-local storage (tls) model to use. */
729 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
731 /* Nonzero means generate extra code for exception handling and enable
732 exception handling. */
736 /* Nonzero means generate frame unwind info table when supported. */
738 int flag_unwind_tables = 0;
740 /* Nonzero means generate frame unwind info table exact at each insn boundary */
742 int flag_asynchronous_unwind_tables = 0;
744 /* Nonzero means don't place uninitialized global data in common storage
749 /* Nonzero means change certain warnings into errors.
750 Usually these are warnings about failure to conform to some standard. */
752 int flag_pedantic_errors = 0;
754 /* flag_schedule_insns means schedule insns within basic blocks (before
756 flag_schedule_insns_after_reload means schedule insns after
759 int flag_schedule_insns = 0;
760 int flag_schedule_insns_after_reload = 0;
762 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
763 int flag_sched2_use_superblocks = 0;
765 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
767 int flag_sched2_use_traces = 0;
769 /* The following flags have effect only for scheduling before register
772 flag_schedule_interblock means schedule insns across basic blocks.
773 flag_schedule_speculative means allow speculative motion of non-load insns.
774 flag_schedule_speculative_load means allow speculative motion of some
776 flag_schedule_speculative_load_dangerous allows speculative motion of more
779 int flag_schedule_interblock = 1;
780 int flag_schedule_speculative = 1;
781 int flag_schedule_speculative_load = 0;
782 int flag_schedule_speculative_load_dangerous = 0;
784 int flag_single_precision_constant;
786 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
787 by a cheaper branch on a count register. */
788 int flag_branch_on_count_reg = 1;
790 /* -finhibit-size-directive inhibits output of .size for ELF.
791 This is used only for compiling crtstuff.c,
792 and it may be extended to other effects
793 needed for crtstuff.c on other systems. */
794 int flag_inhibit_size_directive = 0;
796 /* -fverbose-asm causes extra commentary information to be produced in
797 the generated assembly code (to make it more readable). This option
798 is generally only of use to those who actually need to read the
799 generated assembly code (perhaps while debugging the compiler itself).
800 -fno-verbose-asm, the default, causes the extra information
801 to be omitted and is useful when comparing two assembler files. */
803 int flag_verbose_asm = 0;
805 /* -dA causes debug commentary information to be produced in
806 the generated assembly code (to make it more readable). This option
807 is generally only of use to those who actually need to read the
808 generated assembly code (perhaps while debugging the compiler itself).
809 Currently, this switch is only used by dwarfout.c; however, it is intended
810 to be a catchall for printing debug information in the assembler file. */
812 int flag_debug_asm = 0;
814 /* -dP causes the rtl to be emitted as a comment in assembly. */
816 int flag_dump_rtl_in_asm = 0;
818 /* -fgnu-linker specifies use of the GNU linker for initializations.
819 (Or, more generally, a linker that handles initializations.)
820 -fno-gnu-linker says that collect2 will be used. */
822 int flag_gnu_linker = 0;
824 int flag_gnu_linker = 1;
827 /* Nonzero means put zero initialized data in the bss section. */
828 int flag_zero_initialized_in_bss = 1;
833 /* Enable ssa conditional constant propagation. */
834 int flag_ssa_ccp = 0;
836 /* Enable ssa aggressive dead code elimination. */
837 int flag_ssa_dce = 0;
839 /* Tag all structures with __attribute__(packed). */
840 int flag_pack_struct = 0;
842 /* Emit code to check for stack overflow; also may cause large objects
843 to be allocated dynamically. */
844 int flag_stack_check;
846 /* When non-NULL, indicates that whenever space is allocated on the
847 stack, the resulting stack pointer must not pass this
848 address---that is, for stacks that grow downward, the stack pointer
849 must always be greater than or equal to this address; for stacks
850 that grow upward, the stack pointer must be less than this address.
851 At present, the rtx may be either a REG or a SYMBOL_REF, although
852 the support provided depends on the backend. */
855 /* 0 if pointer arguments may alias each other. True in C.
856 1 if pointer arguments may not alias each other but may alias
858 2 if pointer arguments may not alias each other and may not
859 alias global variables. True in Fortran.
860 This defaults to 0 for C. */
861 int flag_argument_noalias = 0;
863 /* Nonzero if we should do (language-dependent) alias analysis.
864 Typically, this analysis will assume that expressions of certain
865 types do not alias expressions of certain other types. Only used
866 if alias analysis (in general) is enabled. */
867 int flag_strict_aliasing = 0;
869 /* Instrument functions with calls at entry and exit, for profiling. */
870 int flag_instrument_function_entry_exit = 0;
872 /* Nonzero means ignore `#ident' directives. 0 means handle them.
873 On SVR4 targets, it also controls whether or not to emit a
874 string identifying the compiler. */
876 int flag_no_ident = 0;
878 /* This will perform a peephole pass before sched2. */
879 int flag_peephole2 = 0;
881 /* This will try to guess branch probabilities. */
882 int flag_guess_branch_prob = 0;
884 /* -fcheck-bounds causes gcc to generate array bounds checks.
885 For C, C++, ObjC: defaults to off.
886 For Java: defaults to on.
887 For Fortran: defaults to off. */
888 int flag_bounds_check = 0;
890 /* This will attempt to merge constant section constants, if 1 only
891 string constants and constants from constant pool, if 2 also constant
893 int flag_merge_constants = 1;
895 /* If one, renumber instruction UIDs to reduce the number of
896 unused UIDs if there are a lot of instructions. If greater than
897 one, unconditionally renumber instruction UIDs. */
898 int flag_renumber_insns = 1;
900 /* If nonzero, use the graph coloring register allocator. */
901 int flag_new_regalloc = 0;
903 /* Nonzero if we perform superblock formation. */
907 /* Nonzero if we perform whole unit at a time compilation. */
909 int flag_unit_at_a_time = 0;
911 /* Values of the -falign-* flags: how much to align labels in code.
912 0 means `use default', 1 means `don't align'.
913 For each variable, there is an _log variant which is the power
914 of two not less than the variable, for .align output. */
918 int align_loops_max_skip;
921 int align_jumps_max_skip;
923 int align_labels_log;
924 int align_labels_max_skip;
926 int align_functions_log;
928 /* Like align_functions_log above, but used by front-ends to force the
929 minimum function alignment. Zero means no alignment is forced. */
930 int force_align_functions_log;
932 /* Table of supported debugging formats. */
935 const char *const arg;
936 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
937 constant expression, we use NO_DEBUG in its place. */
938 const enum debug_info_type debug_type;
939 const int use_extensions_p;
940 const char *const description;
944 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
945 N_("Generate debugging info in default format") },
946 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
947 #ifdef DBX_DEBUGGING_INFO
948 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
949 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
951 #ifdef DWARF_DEBUGGING_INFO
952 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
953 { "dwarf+", DWARF_DEBUG, 1,
954 N_("Generate extended DWARF-1 format debug info") },
956 #ifdef DWARF2_DEBUGGING_INFO
957 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
959 #ifdef XCOFF_DEBUGGING_INFO
960 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
961 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
963 #ifdef SDB_DEBUGGING_INFO
964 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
966 #ifdef VMS_DEBUGGING_INFO
967 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
974 const char *const string;
977 const char *const description;
979 lang_independent_options;
983 /* Add or remove a leading underscore from user symbols. */
984 int flag_leading_underscore = -1;
986 /* The user symbol prefix after having resolved same. */
987 const char *user_label_prefix;
989 static const param_info lang_independent_params[] = {
990 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
991 { OPTION, DEFAULT, HELP },
992 #include "params.def"
997 /* Table of language-independent -f options.
998 STRING is the option name. VARIABLE is the address of the variable.
999 ON_VALUE is the value to store in VARIABLE
1000 if `-fSTRING' is seen as an option.
1001 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1003 static const lang_independent_options f_options[] =
1005 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
1006 N_("Perform DWARF2 duplicate elimination") },
1007 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1,
1008 N_("Perform unused type elimination in debug info") },
1009 {"float-store", &flag_float_store, 1,
1010 N_("Do not store floats in registers") },
1011 {"defer-pop", &flag_defer_pop, 1,
1012 N_("Defer popping functions args from stack until later") },
1013 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1014 N_("When possible do not generate stack frames") },
1015 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1016 N_("Optimize sibling and tail recursive calls") },
1017 {"tracer", &flag_tracer, 1,
1018 N_("Perform superblock formation via tail duplication") },
1019 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1020 N_("Compile whole compilation unit at a time") },
1021 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1022 N_("When running CSE, follow jumps to their targets") },
1023 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1024 N_("When running CSE, follow conditional jumps") },
1025 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1026 N_("Perform a number of minor, expensive optimizations") },
1027 {"thread-jumps", &flag_thread_jumps, 1,
1028 N_("Perform jump threading optimizations") },
1029 {"strength-reduce", &flag_strength_reduce, 1,
1030 N_("Perform strength reduction optimizations") },
1031 {"unroll-loops", &flag_unroll_loops, 1,
1032 N_("Perform loop unrolling when iteration count is known") },
1033 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1034 N_("Perform loop unrolling for all loops") },
1035 {"old-unroll-loops", &flag_old_unroll_loops, 1,
1036 N_("Perform loop unrolling when iteration count is known") },
1037 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1,
1038 N_("Perform loop unrolling for all loops") },
1039 {"peel-loops", &flag_peel_loops, 1,
1040 N_("Perform loop peeling") },
1041 {"unswitch-loops", &flag_unswitch_loops, 1,
1042 N_("Perform loop unswitching") },
1043 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1044 N_("Generate prefetch instructions, if available, for arrays in loops") },
1045 {"move-all-movables", &flag_move_all_movables, 1,
1046 N_("Force all loop invariant computations out of loops") },
1047 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1048 N_("Strength reduce all loop general induction variables") },
1049 {"writable-strings", &flag_writable_strings, 1,
1050 N_("Store strings in writable data section") },
1051 {"peephole", &flag_no_peephole, 0,
1052 N_("Enable machine specific peephole optimizations") },
1053 {"force-mem", &flag_force_mem, 1,
1054 N_("Copy memory operands into registers before using") },
1055 {"force-addr", &flag_force_addr, 1,
1056 N_("Copy memory address constants into regs before using") },
1057 {"function-cse", &flag_no_function_cse, 0,
1058 N_("Allow function addresses to be held in registers") },
1059 {"inline-functions", &flag_inline_functions, 1,
1060 N_("Integrate simple functions into their callers") },
1061 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1062 N_("Generate code for funcs even if they are fully inlined") },
1063 {"inline", &flag_no_inline, 0,
1064 N_("Pay attention to the 'inline' keyword") },
1065 {"keep-static-consts", &flag_keep_static_consts, 1,
1066 N_("Emit static const variables even if they are not used") },
1067 {"syntax-only", &flag_syntax_only, 1,
1068 N_("Check for syntax errors, then stop") },
1069 {"shared-data", &flag_shared_data, 1,
1070 N_("Mark data as shared rather than private") },
1071 {"caller-saves", &flag_caller_saves, 1,
1072 N_("Enable saving registers around function calls") },
1073 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1074 N_("Return 'short' aggregates in memory, not registers") },
1075 {"reg-struct-return", &flag_pcc_struct_return, 0,
1076 N_("Return 'short' aggregates in registers") },
1077 {"delayed-branch", &flag_delayed_branch, 1,
1078 N_("Attempt to fill delay slots of branch instructions") },
1079 {"gcse", &flag_gcse, 1,
1080 N_("Perform the global common subexpression elimination") },
1081 {"gcse-lm", &flag_gcse_lm, 1,
1082 N_("Perform enhanced load motion during global subexpression elimination") },
1083 {"gcse-sm", &flag_gcse_sm, 1,
1084 N_("Perform store motion after global subexpression elimination") },
1085 {"loop-optimize", &flag_loop_optimize, 1,
1086 N_("Perform the loop optimizations") },
1087 {"crossjumping", &flag_crossjumping, 1,
1088 N_("Perform cross-jumping optimization") },
1089 {"if-conversion", &flag_if_conversion, 1,
1090 N_("Perform conversion of conditional jumps to branchless equivalents") },
1091 {"if-conversion2", &flag_if_conversion2, 1,
1092 N_("Perform conversion of conditional jumps to conditional execution") },
1093 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1094 N_("Run CSE pass after loop optimizations") },
1095 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1096 N_("Run the loop optimizer twice") },
1097 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1098 N_("Delete useless null pointer checks") },
1099 {"schedule-insns", &flag_schedule_insns, 1,
1100 N_("Reschedule instructions before register allocation") },
1101 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1102 N_("Reschedule instructions after register allocation") },
1103 {"sched-interblock",&flag_schedule_interblock, 1,
1104 N_("Enable scheduling across basic blocks") },
1105 {"sched-spec",&flag_schedule_speculative, 1,
1106 N_("Allow speculative motion of non-loads") },
1107 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1108 N_("Allow speculative motion of some loads") },
1109 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1110 N_("Allow speculative motion of more loads") },
1111 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1112 N_("If scheduling post reload, do superblock sheduling") },
1113 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1114 N_("If scheduling post reload, do trace sheduling") },
1115 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1116 N_("Replace add,compare,branch with branch on count reg") },
1117 {"pic", &flag_pic, 1,
1118 N_("Generate position independent code, if possible") },
1119 {"PIC", &flag_pic, 2, ""},
1120 {"exceptions", &flag_exceptions, 1,
1121 N_("Enable exception handling") },
1122 {"unwind-tables", &flag_unwind_tables, 1,
1123 N_("Just generate unwind tables for exception handling") },
1124 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1125 N_("Generate unwind tables exact at each instruction boundary") },
1126 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1127 N_("Support synchronous non-call exceptions") },
1128 {"profile-arcs", &profile_arc_flag, 1,
1129 N_("Insert arc based program profiling code") },
1130 {"test-coverage", &flag_test_coverage, 1,
1131 N_("Create data files needed by gcov") },
1132 {"branch-probabilities", &flag_branch_probabilities, 1,
1133 N_("Use profiling information for branch probabilities") },
1134 {"profile", &profile_flag, 1,
1135 N_("Enable basic program profiling code") },
1136 {"reorder-blocks", &flag_reorder_blocks, 1,
1137 N_("Reorder basic blocks to improve code placement") },
1138 {"reorder-functions", &flag_reorder_functions, 1,
1139 N_("Reorder functions to improve code placement") },
1140 {"rename-registers", &flag_rename_registers, 1,
1141 N_("Do the register renaming optimization pass") },
1142 {"cprop-registers", &flag_cprop_registers, 1,
1143 N_("Do the register copy-propagation optimization pass") },
1144 {"common", &flag_no_common, 0,
1145 N_("Do not put uninitialized globals in the common section") },
1146 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1147 N_("Do not generate .size directives") },
1148 {"function-sections", &flag_function_sections, 1,
1149 N_("place each function into its own section") },
1150 {"data-sections", &flag_data_sections, 1,
1151 N_("place data items into their own section") },
1152 {"verbose-asm", &flag_verbose_asm, 1,
1153 N_("Add extra commentry to assembler output") },
1154 {"gnu-linker", &flag_gnu_linker, 1,
1155 N_("Output GNU ld formatted global initializers") },
1156 {"regmove", &flag_regmove, 1,
1157 N_("Enables a register move optimization") },
1158 {"optimize-register-move", &flag_regmove, 1,
1159 N_("Do the full regmove optimization pass") },
1160 {"pack-struct", &flag_pack_struct, 1,
1161 N_("Pack structure members together without holes") },
1162 {"stack-check", &flag_stack_check, 1,
1163 N_("Insert stack checking code into the program") },
1164 {"argument-alias", &flag_argument_noalias, 0,
1165 N_("Specify that arguments may alias each other & globals") },
1166 {"argument-noalias", &flag_argument_noalias, 1,
1167 N_("Assume arguments may alias globals but not each other") },
1168 {"argument-noalias-global", &flag_argument_noalias, 2,
1169 N_("Assume arguments do not alias each other or globals") },
1170 {"strict-aliasing", &flag_strict_aliasing, 1,
1171 N_("Assume strict aliasing rules apply") },
1172 {"align-loops", &align_loops, 0,
1173 N_("Align the start of loops") },
1174 {"align-jumps", &align_jumps, 0,
1175 N_("Align labels which are only reached by jumping") },
1176 {"align-labels", &align_labels, 0,
1177 N_("Align all labels") },
1178 {"align-functions", &align_functions, 0,
1179 N_("Align the start of functions") },
1180 {"merge-constants", &flag_merge_constants, 1,
1181 N_("Attempt to merge identical constants accross compilation units") },
1182 {"merge-all-constants", &flag_merge_constants, 2,
1183 N_("Attempt to merge identical constants and constant variables") },
1184 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1185 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1186 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1187 N_("Instrument function entry/exit with profiling calls") },
1188 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1189 N_("Put zero initialized data in the bss section") },
1190 {"ssa", &flag_ssa, 1,
1191 N_("Enable SSA optimizations") },
1192 {"ssa-ccp", &flag_ssa_ccp, 1,
1193 N_("Enable SSA conditional constant propagation") },
1194 {"ssa-dce", &flag_ssa_dce, 1,
1195 N_("Enable aggressive SSA dead code elimination") },
1196 {"leading-underscore", &flag_leading_underscore, 1,
1197 N_("External symbols have a leading underscore") },
1198 {"ident", &flag_no_ident, 0,
1199 N_("Process #ident directives") },
1200 { "peephole2", &flag_peephole2, 1,
1201 N_("Enables an rtl peephole pass run before sched2") },
1202 {"finite-math-only", &flag_finite_math_only, 1,
1203 N_("Assume no NaNs or +-Infs are generated") },
1204 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1205 N_("Enables guessing of branch probabilities") },
1206 {"math-errno", &flag_errno_math, 1,
1207 N_("Set errno after built-in math functions") },
1208 {"trapping-math", &flag_trapping_math, 1,
1209 N_("Floating-point operations can trap") },
1210 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1211 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1212 {"signaling-nans", &flag_signaling_nans, 1,
1213 N_("Disable optimizations observable by IEEE signaling NaNs") },
1214 {"bounds-check", &flag_bounds_check, 1,
1215 N_("Generate code to check bounds before indexing arrays") },
1216 {"single-precision-constant", &flag_single_precision_constant, 1,
1217 N_("Convert floating point constant to single precision constant") },
1218 {"time-report", &time_report, 1,
1219 N_("Report time taken by each compiler pass at end of run") },
1220 {"mem-report", &mem_report, 1,
1221 N_("Report on permanent memory allocation at end of run") },
1222 { "trapv", &flag_trapv, 1,
1223 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1224 { "new-ra", &flag_new_regalloc, 1,
1225 N_("Use graph coloring register allocation.") },
1228 /* Table of language-specific options. */
1230 static const struct lang_opt
1232 const char *const option;
1233 const char *const description;
1235 documented_lang_options[] =
1237 /* In order not to overload the --help output, the convention
1238 used here is to only describe those options which are not
1239 enabled by default. */
1242 N_("Compile just for ISO C90") },
1244 N_("Determine language standard") },
1246 { "-fsigned-bitfields", "" },
1247 { "-funsigned-bitfields",
1248 N_("Make bit-fields by unsigned by default") },
1249 { "-fno-signed-bitfields", "" },
1250 { "-fno-unsigned-bitfields","" },
1252 N_("Make 'char' be signed by default") },
1253 { "-funsigned-char",
1254 N_("Make 'char' be unsigned by default") },
1255 { "-fno-signed-char", "" },
1256 { "-fno-unsigned-char", "" },
1260 N_("Do not recognize the 'asm' keyword") },
1261 { "-fbuiltin", "" },
1263 N_("Do not recognize any built in functions") },
1265 N_("Assume normal C execution environment") },
1266 { "-fno-hosted", "" },
1268 N_("Assume that standard libraries & main might not exist") },
1269 { "-fno-freestanding", "" },
1270 { "-fcond-mismatch",
1271 N_("Allow different types as args of ? operator") },
1272 { "-fno-cond-mismatch", "" },
1273 { "-fdollars-in-identifiers",
1274 N_("Allow the use of $ inside identifiers") },
1275 { "-fno-dollars-in-identifiers", "" },
1276 { "-fpreprocessed", "" },
1277 { "-fno-preprocessed", "" },
1279 N_("Use the same size for double as for float") },
1280 { "-fno-short-double", "" },
1282 N_("Use the smallest fitting integer to hold enums") },
1283 { "-fno-short-enums", "" },
1285 N_("Override the underlying type for wchar_t to `unsigned short'") },
1286 { "-fno-short-wchar", "" },
1289 N_("Enable most warning messages") },
1290 { "-Wbad-function-cast",
1291 N_("Warn about casting functions to incompatible types") },
1292 { "-Wno-bad-function-cast", "" },
1293 { "-Wmissing-format-attribute",
1294 N_("Warn about functions which might be candidates for format attributes") },
1295 { "-Wno-missing-format-attribute", "" },
1297 N_("Warn about casts which discard qualifiers") },
1298 { "-Wno-cast-qual", "" },
1299 { "-Wchar-subscripts",
1300 N_("Warn about subscripts whose type is 'char'") },
1301 { "-Wno-char-subscripts", "" },
1303 N_("Warn if nested comments are detected") },
1304 { "-Wno-comment", "" },
1306 N_("Warn if nested comments are detected") },
1307 { "-Wno-comments", "" },
1309 N_("Warn about possibly confusing type conversions") },
1310 { "-Wno-conversion", "" },
1311 { "-Wdiv-by-zero", "" },
1312 { "-Wno-div-by-zero",
1313 N_("Do not warn about compile-time integer division by zero") },
1315 N_("Warn about testing equality of floating point numbers") },
1316 { "-Wno-float-equal", "" },
1318 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1319 { "-Wno-format", "" },
1320 { "-Wformat-extra-args", "" },
1321 { "-Wno-format-extra-args",
1322 N_("Don't warn about too many arguments to format functions") },
1323 { "-Wformat-nonliteral",
1324 N_("Warn about non-string-literal format strings") },
1325 { "-Wno-format-nonliteral", "" },
1326 { "-Wformat-security",
1327 N_("Warn about possible security problems with format functions") },
1328 { "-Wno-format-security", "" },
1329 { "-Wformat-y2k", "" },
1330 { "-Wno-format-y2k",
1331 N_("Don't warn about strftime formats yielding 2 digit years") },
1332 { "-Wimplicit-function-declaration",
1333 N_("Warn about implicit function declarations") },
1334 { "-Wno-implicit-function-declaration", "" },
1335 { "-Werror-implicit-function-declaration", "" },
1337 N_("Warn when a declaration does not specify a type") },
1338 { "-Wno-implicit-int", "" },
1339 { "-Wimplicit", "" },
1340 { "-Wno-implicit", "" },
1342 N_("Warn about the use of the #import directive") },
1343 { "-Wno-import", "" },
1345 N_("Warn about PCH files that are found but not used") },
1346 { "-Wlong-long","" },
1348 N_("Do not warn about using 'long long' when -pedantic") },
1350 N_("Warn about suspicious declarations of main") },
1351 { "-Wno-main", "" },
1352 { "-Wmissing-braces",
1353 N_("Warn about possibly missing braces around initializers") },
1354 { "-Wno-missing-braces", "" },
1355 { "-Wmissing-declarations",
1356 N_("Warn about global funcs without previous declarations") },
1357 { "-Wno-missing-declarations", "" },
1358 { "-Wmissing-prototypes",
1359 N_("Warn about global funcs without prototypes") },
1360 { "-Wno-missing-prototypes", "" },
1362 N_("Warn about use of multicharacter literals") },
1363 { "-Wno-multichar", "" },
1364 { "-Wnested-externs",
1365 N_("Warn about externs not at file scope level") },
1366 { "-Wno-nested-externs", "" },
1368 N_("Warn about possible missing parentheses") },
1369 { "-Wno-parentheses", "" },
1370 { "-Wpointer-arith",
1371 N_("Warn about function pointer arithmetic") },
1372 { "-Wno-pointer-arith", "" },
1373 { "-Wredundant-decls",
1374 N_("Warn about multiple declarations of the same object") },
1375 { "-Wno-redundant-decls", "" },
1377 N_("Warn whenever a function's return-type defaults to int") },
1378 { "-Wno-return-type", "" },
1379 { "-Wsequence-point",
1380 N_("Warn about possible violations of sequence point rules") },
1381 { "-Wno-sequence-point", "" },
1383 N_("Warn about signed/unsigned comparisons") },
1384 { "-Wno-sign-compare", "" },
1385 { "-Wstrict-prototypes",
1386 N_("Warn about non-prototyped function decls") },
1387 { "-Wno-strict-prototypes", "" },
1389 N_("Warn about constructs whose meanings change in ISO C") },
1390 { "-Wno-traditional", "" },
1392 N_("Warn when trigraphs are encountered") },
1393 { "-Wno-trigraphs", "" },
1395 { "-Wno-undef", "" },
1396 { "-Wunknown-pragmas",
1397 N_("Warn about unrecognized pragmas") },
1398 { "-Wno-unknown-pragmas", "" },
1399 { "-Wwrite-strings",
1400 N_("Mark strings as 'const char *'") },
1401 { "-Wno-write-strings", "" },
1403 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1405 #include "options.h"
1409 /* Here is a table, controlled by the tm.h file, listing each -m switch
1410 and which bits in `target_switches' it should set or clear.
1411 If VALUE is positive, it is bits to set.
1412 If VALUE is negative, -VALUE is bits to clear.
1413 (The sign bit is not used so there is no confusion.) */
1417 const char *const name;
1419 const char *const description;
1421 target_switches[] = TARGET_SWITCHES;
1423 /* This table is similar, but allows the switch to have a value. */
1425 #ifdef TARGET_OPTIONS
1428 const char *const prefix;
1429 const char **const variable;
1430 const char *const description;
1432 target_options[] = TARGET_OPTIONS;
1435 /* Options controlling warnings. */
1437 /* Don't print warning messages. -w. */
1439 int inhibit_warnings = 0;
1441 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1443 int warn_system_headers = 0;
1445 /* Print various extra warnings. -W/-Wextra. */
1447 int extra_warnings = 0;
1449 /* Treat warnings as errors. -Werror. */
1451 int warnings_are_errors = 0;
1453 /* Nonzero to warn about unused variables, functions et.al. */
1455 int warn_unused_function;
1456 int warn_unused_label;
1457 int warn_unused_parameter;
1458 int warn_unused_variable;
1459 int warn_unused_value;
1461 /* Nonzero to warn about code which is never reached. */
1463 int warn_notreached;
1465 /* Nonzero to warn about variables used before they are initialized. */
1467 int warn_uninitialized;
1469 /* Nonzero means warn about all declarations which shadow others. */
1473 /* Warn if a switch on an enum, that does not have a default case,
1474 fails to have a case for every enum value. */
1478 /* Warn if a switch does not have a default case. */
1480 int warn_switch_default;
1482 /* Warn if a switch on an enum fails to have a case for every enum
1483 value (regardless of the presence or otherwise of a default case). */
1485 int warn_switch_enum;
1487 /* Nonzero means warn about function definitions that default the return type
1488 or that use a null return and have a return-type other than void. */
1490 int warn_return_type;
1492 /* Nonzero means warn about pointer casts that increase the required
1493 alignment of the target type (and might therefore lead to a crash
1494 due to a misaligned access). */
1496 int warn_cast_align;
1498 /* Nonzero means warn about any objects definitions whose size is larger
1499 than N bytes. Also want about function definitions whose returned
1500 values are larger than N bytes. The value N is in `larger_than_size'. */
1502 int warn_larger_than;
1503 HOST_WIDE_INT larger_than_size;
1505 /* Nonzero means warn if inline function is too large. */
1509 /* Warn if a function returns an aggregate,
1510 since there are often incompatible calling conventions for doing this. */
1512 int warn_aggregate_return;
1514 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1518 /* Warn when gcc pads a structure to an alignment boundary. */
1522 /* Warn when an optimization pass is disabled. */
1524 int warn_disabled_optimization;
1526 /* Warn about functions which might be candidates for attribute noreturn. */
1528 int warn_missing_noreturn;
1530 /* Nonzero means warn about uses of __attribute__((deprecated))
1533 int warn_deprecated_decl = 1;
1535 /* Nonzero means warn about constructs which might not be
1536 strict-aliasing safe. */
1538 int warn_strict_aliasing;
1540 /* Like f_options, but for -W. */
1542 static const lang_independent_options W_options[] =
1544 {"unused-function", &warn_unused_function, 1,
1545 N_("Warn when a function is unused") },
1546 {"unused-label", &warn_unused_label, 1,
1547 N_("Warn when a label is unused") },
1548 {"unused-parameter", &warn_unused_parameter, 1,
1549 N_("Warn when a function parameter is unused") },
1550 {"unused-variable", &warn_unused_variable, 1,
1551 N_("Warn when a variable is unused") },
1552 {"unused-value", &warn_unused_value, 1,
1553 N_("Warn when an expression value is unused") },
1554 {"system-headers", &warn_system_headers, 1,
1555 N_("Do not suppress warnings from system headers") },
1556 {"error", &warnings_are_errors, 1,
1557 N_("Treat all warnings as errors") },
1558 {"shadow", &warn_shadow, 1,
1559 N_("Warn when one local variable shadows another") },
1560 {"switch", &warn_switch, 1,
1561 N_("Warn about enumerated switches, with no default, missing a case") },
1562 {"switch-default", &warn_switch_default, 1,
1563 N_("Warn about enumerated switches missing a default case") },
1564 {"switch-enum", &warn_switch_enum, 1,
1565 N_("Warn about all enumerated switches missing a specific case") },
1566 {"aggregate-return", &warn_aggregate_return, 1,
1567 N_("Warn about returning structures, unions or arrays") },
1568 {"cast-align", &warn_cast_align, 1,
1569 N_("Warn about pointer casts which increase alignment") },
1570 {"unreachable-code", &warn_notreached, 1,
1571 N_("Warn about code that will never be executed") },
1572 {"uninitialized", &warn_uninitialized, 1,
1573 N_("Warn about uninitialized automatic variables") },
1574 {"inline", &warn_inline, 1,
1575 N_("Warn when an inlined function cannot be inlined") },
1576 {"packed", &warn_packed, 1,
1577 N_("Warn when the packed attribute has no effect on struct layout") },
1578 {"padded", &warn_padded, 1,
1579 N_("Warn when padding is required to align struct members") },
1580 {"disabled-optimization", &warn_disabled_optimization, 1,
1581 N_("Warn when an optimization pass is disabled") },
1582 {"deprecated-declarations", &warn_deprecated_decl, 1,
1583 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1584 {"extra", &extra_warnings, 1,
1585 N_("Print extra (possibly unwanted) warnings") },
1586 {"missing-noreturn", &warn_missing_noreturn, 1,
1587 N_("Warn about functions which might be candidates for attribute noreturn") },
1588 {"strict-aliasing", &warn_strict_aliasing, 1,
1589 N_ ("Warn about code which might break the strict aliasing rules") }
1593 set_Wunused (setting)
1596 warn_unused_function = setting;
1597 warn_unused_label = setting;
1598 /* Unused function parameter warnings are reported when either ``-W
1599 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1600 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1602 warn_unused_parameter = 0;
1603 else if (!warn_unused_parameter)
1604 warn_unused_parameter = -1;
1605 warn_unused_variable = setting;
1606 warn_unused_value = setting;
1609 /* The following routines are useful in setting all the flags that
1610 -ffast-math and -fno-fast-math imply. */
1613 set_fast_math_flags (set)
1616 flag_trapping_math = !set;
1617 flag_unsafe_math_optimizations = set;
1618 flag_finite_math_only = set;
1619 flag_errno_math = !set;
1621 flag_signaling_nans = 0;
1624 /* Return true iff flags are set as if -ffast-math. */
1626 fast_math_flags_set_p ()
1628 return (!flag_trapping_math
1629 && flag_unsafe_math_optimizations
1630 && flag_finite_math_only
1631 && !flag_errno_math);
1635 /* Output files for assembler code (real compiler output)
1636 and debugging dumps. */
1639 FILE *aux_info_file;
1640 FILE *rtl_dump_file = NULL;
1642 /* Decode the string P as an integral parameter.
1643 If the string is indeed an integer return its numeric value else
1644 issue an Invalid Option error for the option PNAME and return DEFVAL.
1645 If PNAME is zero just return DEFVAL, do not call error. */
1648 read_integral_parameter (p, pname, defval)
1653 const char *endp = p;
1657 if (ISDIGIT (*endp))
1666 error ("invalid option `%s'", pname);
1673 /* This calls abort and is used to avoid problems when abort is a macro.
1674 It is used when we need to pass the address of abort. */
1682 /* When `malloc.c' is compiled with `rcheck' defined,
1683 it calls this function to report clobberage. */
1687 const char *s ATTRIBUTE_UNUSED;
1692 /* Return the logarithm of X, base 2, considering X unsigned,
1693 if X is a power of 2. Otherwise, returns -1.
1695 This should be used via the `exact_log2' macro. */
1699 unsigned HOST_WIDE_INT x;
1702 /* Test for 0 or a power of 2. */
1703 if (x == 0 || x != (x & -x))
1705 while ((x >>= 1) != 0)
1710 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1711 If X is 0, return -1.
1713 This should be used via the floor_log2 macro. */
1717 unsigned HOST_WIDE_INT x;
1726 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1727 into ICE messages, which is much more user friendly. */
1730 crash_signal (signo)
1733 internal_error ("%s", strsignal (signo));
1736 /* Arrange to dump core on error. (The regular error message is still
1737 printed first, except in the case of abort().) */
1740 setup_core_dumping ()
1743 signal (SIGABRT, SIG_DFL);
1745 #if defined(HAVE_SETRLIMIT)
1748 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1749 fatal_io_error ("getting core file size maximum limit");
1750 rlim.rlim_cur = rlim.rlim_max;
1751 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1752 fatal_io_error ("setting core file size limit to maximum");
1755 diagnostic_abort_on_error (global_dc);
1759 /* Strip off a legitimate source ending from the input string NAME of
1760 length LEN. Rather than having to know the names used by all of
1761 our front ends, we strip off an ending of a period followed by
1762 up to five characters. (Java uses ".class".) */
1765 strip_off_ending (name, len)
1770 for (i = 2; i < 6 && len > i; i++)
1772 if (name[len - i] == '.')
1774 name[len - i] = '\0';
1780 /* Output a quoted string. */
1783 output_quoted_string (asm_file, string)
1787 #ifdef OUTPUT_QUOTED_STRING
1788 OUTPUT_QUOTED_STRING (asm_file, string);
1792 putc ('\"', asm_file);
1793 while ((c = *string++) != 0)
1797 if (c == '\"' || c == '\\')
1798 putc ('\\', asm_file);
1802 fprintf (asm_file, "\\%03o", (unsigned char) c);
1804 putc ('\"', asm_file);
1808 /* Output NAME into FILE after having turned it into something
1809 usable as an identifier in a target's assembly file. */
1811 output_clean_symbol_name (file, name)
1815 /* Make a copy of NAME. */
1816 char *id = xstrdup (name);
1818 /* Make it look like a valid identifier for an assembler. */
1819 clean_symbol_name (id);
1826 /* Output a file name in the form wanted by System V. */
1829 output_file_directive (asm_file, input_name)
1831 const char *input_name;
1833 int len = strlen (input_name);
1834 const char *na = input_name + len;
1836 /* NA gets INPUT_NAME sans directory names. */
1837 while (na > input_name)
1839 if (IS_DIR_SEPARATOR (na[-1]))
1844 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1845 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1847 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1848 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1850 fprintf (asm_file, "\t.file\t");
1851 output_quoted_string (asm_file, na);
1852 fputc ('\n', asm_file);
1857 /* Routine to open a dump file. Return true if the dump file is enabled. */
1860 open_dump_file (index, decl)
1861 enum dump_file_index index;
1865 const char *open_arg;
1868 if (! dump_file[index].enabled)
1871 timevar_push (TV_DUMP);
1872 if (rtl_dump_file != NULL)
1873 fclose (rtl_dump_file);
1875 sprintf (seq, DUMPFILE_FORMAT, index);
1877 if (! dump_file[index].initialized)
1879 /* If we've not initialized the files, do so now. */
1880 if (graph_dump_format != no_graph
1881 && dump_file[index].graph_dump_p)
1883 dump_name = concat (seq, dump_file[index].extension, NULL);
1884 clean_graph_dump_file (dump_base_name, dump_name);
1887 dump_file[index].initialized = 1;
1893 dump_name = concat (dump_base_name, seq,
1894 dump_file[index].extension, NULL);
1896 rtl_dump_file = fopen (dump_name, open_arg);
1897 if (rtl_dump_file == NULL)
1898 fatal_io_error ("can't open %s", dump_name);
1903 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1904 (*lang_hooks.decl_printable_name) (decl, 2),
1905 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1907 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1908 ? " (unlikely executed)"
1911 timevar_pop (TV_DUMP);
1915 /* Routine to close a dump file. */
1918 close_dump_file (index, func, insns)
1919 enum dump_file_index index;
1920 void (*func) PARAMS ((FILE *, rtx));
1923 if (! rtl_dump_file)
1926 timevar_push (TV_DUMP);
1928 && graph_dump_format != no_graph
1929 && dump_file[index].graph_dump_p)
1934 sprintf (seq, DUMPFILE_FORMAT, index);
1935 suffix = concat (seq, dump_file[index].extension, NULL);
1936 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1941 func (rtl_dump_file, insns);
1943 fflush (rtl_dump_file);
1944 fclose (rtl_dump_file);
1946 rtl_dump_file = NULL;
1947 timevar_pop (TV_DUMP);
1950 /* Do any final processing required for the declarations in VEC, of
1951 which there are LEN. We write out inline functions and variables
1952 that have been deferred until this point, but which are required.
1953 Returns nonzero if anything was put out. */
1956 wrapup_global_declarations (vec, len)
1963 int output_something = 0;
1965 for (i = 0; i < len; i++)
1969 /* We're not deferring this any longer. Assignment is
1970 conditional to avoid needlessly dirtying PCH pages. */
1971 if (DECL_DEFER_OUTPUT (decl) != 0)
1972 DECL_DEFER_OUTPUT (decl) = 0;
1974 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1975 (*lang_hooks.finish_incomplete_decl) (decl);
1978 /* Now emit any global variables or functions that we have been
1979 putting off. We need to loop in case one of the things emitted
1980 here references another one which comes earlier in the list. */
1984 for (i = 0; i < len; i++)
1988 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1991 /* Don't write out static consts, unless we still need them.
1993 We also keep static consts if not optimizing (for debugging),
1994 unless the user specified -fno-keep-static-consts.
1995 ??? They might be better written into the debug information.
1996 This is possible when using DWARF.
1998 A language processor that wants static constants to be always
1999 written out (even if it is not used) is responsible for
2000 calling rest_of_decl_compilation itself. E.g. the C front-end
2001 calls rest_of_decl_compilation from finish_decl.
2002 One motivation for this is that is conventional in some
2003 environments to write things like:
2004 static const char rcsid[] = "... version string ...";
2005 intending to force the string to be in the executable.
2007 A language processor that would prefer to have unneeded
2008 static constants "optimized away" would just defer writing
2009 them out until here. E.g. C++ does this, because static
2010 constants are often defined in header files.
2012 ??? A tempting alternative (for both C and C++) would be
2013 to force a constant to be written if and only if it is
2014 defined in a main file, as opposed to an include file. */
2016 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2020 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2022 else if (DECL_COMDAT (decl))
2024 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
2025 && (optimize || !flag_keep_static_consts
2026 || DECL_ARTIFICIAL (decl)))
2032 rest_of_decl_compilation (decl, NULL, 1, 1);
2036 if (TREE_CODE (decl) == FUNCTION_DECL
2037 && DECL_INITIAL (decl) != 0
2038 && DECL_SAVED_INSNS (decl) != 0
2039 && (flag_keep_inline_functions
2040 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2041 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2044 output_inline_function (decl);
2049 output_something = 1;
2053 return output_something;
2056 /* Issue appropriate warnings for the global declarations in VEC (of
2057 which there are LEN). Output debugging information for them. */
2060 check_global_declarations (vec, len)
2067 for (i = 0; i < len; i++)
2071 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2072 && ! TREE_ASM_WRITTEN (decl))
2073 /* Cancel the RTL for this decl so that, if debugging info
2074 output for global variables is still to come,
2075 this one will be omitted. */
2076 SET_DECL_RTL (decl, NULL_RTX);
2078 /* Warn about any function
2079 declared static but not defined.
2080 We don't warn about variables,
2081 because many programs have static variables
2082 that exist only to get some text into the object file. */
2083 if (TREE_CODE (decl) == FUNCTION_DECL
2084 && (warn_unused_function
2085 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2086 && DECL_INITIAL (decl) == 0
2087 && DECL_EXTERNAL (decl)
2088 && ! DECL_ARTIFICIAL (decl)
2089 && ! TREE_PUBLIC (decl))
2091 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2092 pedwarn_with_decl (decl,
2093 "`%s' used but never defined");
2095 warning_with_decl (decl,
2096 "`%s' declared `static' but never defined");
2097 /* This symbol is effectively an "extern" declaration now. */
2098 TREE_PUBLIC (decl) = 1;
2099 assemble_external (decl);
2102 /* Warn about static fns or vars defined but not used. */
2103 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2104 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2105 && ! TREE_USED (decl)
2106 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2107 to handle multiple external decls in different scopes. */
2108 && ! TREE_USED (DECL_NAME (decl))
2109 && ! DECL_EXTERNAL (decl)
2110 && ! TREE_PUBLIC (decl)
2111 /* Global register variables must be declared to reserve them. */
2112 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2113 /* Otherwise, ask the language. */
2114 && (*lang_hooks.decls.warn_unused_global) (decl))
2115 warning_with_decl (decl, "`%s' defined but not used");
2117 /* Avoid confusing the debug information machinery when there are
2119 if (errorcount == 0 && sorrycount == 0)
2121 timevar_push (TV_SYMOUT);
2122 (*debug_hooks->global_decl) (decl);
2123 timevar_pop (TV_SYMOUT);
2128 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2129 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2130 INPUT_FILENAME and LINENO accordingly. */
2133 push_srcloc (file, line)
2137 struct file_stack *fs;
2139 if (input_file_stack)
2141 input_file_stack->name = input_filename;
2142 input_file_stack->line = lineno;
2145 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2146 fs->name = input_filename = file;
2147 fs->line = lineno = line;
2148 fs->next = input_file_stack;
2149 input_file_stack = fs;
2150 input_file_stack_tick++;
2153 /* Pop the top entry off the stack of presently open source files.
2154 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2160 struct file_stack *fs;
2162 fs = input_file_stack;
2163 input_file_stack = fs->next;
2165 input_file_stack_tick++;
2166 /* The initial source file is never popped. */
2167 if (!input_file_stack)
2169 input_filename = input_file_stack->name;
2170 lineno = input_file_stack->line;
2173 /* Compile an entire translation unit. Write a file of assembly
2174 output and various debugging dumps. */
2179 /* Initialize yet another pass. */
2181 init_final (main_input_filename);
2182 init_branch_prob (aux_base_name);
2184 timevar_push (TV_PARSE);
2186 /* Call the parser, which parses the entire file (calling
2187 rest_of_compilation for each function). */
2188 (*lang_hooks.parse_file) (set_yydebug);
2190 /* In case there were missing block closers,
2191 get us back to the global binding level. */
2192 (*lang_hooks.clear_binding_stack) ();
2194 /* Compilation is now finished except for writing
2195 what's left of the symbol table output. */
2196 timevar_pop (TV_PARSE);
2198 if (flag_syntax_only)
2201 (*lang_hooks.decls.final_write_globals)();
2203 if (profile_arc_flag)
2204 /* This must occur after the loop to output deferred functions.
2205 Else the profiler initializer would not be emitted if all the
2206 functions in this compilation unit were deferred. */
2209 /* Write out any pending weak symbol declarations. */
2213 /* Do dbx symbols. */
2214 timevar_push (TV_SYMOUT);
2216 #ifdef DWARF2_UNWIND_INFO
2217 if (dwarf2out_do_frame ())
2218 dwarf2out_frame_finish ();
2221 (*debug_hooks->finish) (main_input_filename);
2222 timevar_pop (TV_SYMOUT);
2224 /* Output some stuff at end of file if nec. */
2226 dw2_output_indirect_constants ();
2228 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2230 timevar_push (TV_DUMP);
2231 open_dump_file (DFI_bp, NULL);
2235 close_dump_file (DFI_bp, NULL, NULL_RTX);
2236 timevar_pop (TV_DUMP);
2240 ASM_FILE_END (asm_out_file);
2243 /* Attach a special .ident directive to the end of the file to identify
2244 the version of GCC which compiled this code. The format of the .ident
2245 string is patterned after the ones produced by native SVR4 compilers. */
2248 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2249 IDENT_ASM_OP, version_string);
2252 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2254 timevar_push (TV_DUMP);
2255 dump_combine_total_stats (rtl_dump_file);
2256 close_dump_file (DFI_combine, NULL, NULL_RTX);
2257 timevar_pop (TV_DUMP);
2261 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2262 and TYPE_DECL nodes.
2264 This does nothing for local (non-static) variables, unless the
2265 variable is a register variable with an ASMSPEC. In that case, or
2266 if the variable is not an automatic, it sets up the RTL and
2267 outputs any assembler code (label definition, storage allocation
2268 and initialization).
2270 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2271 the assembler symbol name to be used. TOP_LEVEL is nonzero
2272 if this declaration is not within a function. */
2275 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2277 const char *asmspec;
2281 /* We deferred calling assemble_alias so that we could collect
2282 other attributes such as visibility. Emit the alias now. */
2285 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2288 alias = TREE_VALUE (TREE_VALUE (alias));
2289 alias = get_identifier (TREE_STRING_POINTER (alias));
2290 assemble_alias (decl, alias);
2294 /* Forward declarations for nested functions are not "external",
2295 but we need to treat them as if they were. */
2296 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2297 || TREE_CODE (decl) == FUNCTION_DECL)
2299 timevar_push (TV_VARCONST);
2302 make_decl_rtl (decl, asmspec);
2304 /* Don't output anything when a tentative file-scope definition
2305 is seen. But at end of compilation, do output code for them. */
2306 if (at_end || !DECL_DEFER_OUTPUT (decl))
2307 assemble_variable (decl, top_level, at_end, 0);
2309 #ifdef ASM_FINISH_DECLARE_OBJECT
2310 if (decl == last_assemble_variable_decl)
2312 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2317 timevar_pop (TV_VARCONST);
2319 else if (DECL_REGISTER (decl) && asmspec != 0)
2321 if (decode_reg_name (asmspec) >= 0)
2323 SET_DECL_RTL (decl, NULL_RTX);
2324 make_decl_rtl (decl, asmspec);
2328 error ("invalid register name `%s' for register variable", asmspec);
2329 DECL_REGISTER (decl) = 0;
2334 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2335 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2336 && TREE_CODE (decl) == TYPE_DECL)
2338 timevar_push (TV_SYMOUT);
2339 dbxout_symbol (decl, 0);
2340 timevar_pop (TV_SYMOUT);
2343 #ifdef SDB_DEBUGGING_INFO
2344 else if (write_symbols == SDB_DEBUG && top_level
2345 && TREE_CODE (decl) == TYPE_DECL)
2347 timevar_push (TV_SYMOUT);
2348 sdbout_symbol (decl, 0);
2349 timevar_pop (TV_SYMOUT);
2352 #ifdef DWARF2_DEBUGGING_INFO
2353 else if ((write_symbols == DWARF2_DEBUG
2354 || write_symbols == VMS_AND_DWARF2_DEBUG)
2356 && TREE_CODE (decl) == TYPE_DECL)
2358 timevar_push (TV_SYMOUT);
2359 dwarf2out_decl (decl);
2360 timevar_pop (TV_SYMOUT);
2365 /* Called after finishing a record, union or enumeral type. */
2368 rest_of_type_compilation (type, toplev)
2369 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2370 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2374 tree type ATTRIBUTE_UNUSED;
2375 int toplev ATTRIBUTE_UNUSED;
2378 /* Avoid confusing the debug information machinery when there are
2380 if (errorcount != 0 || sorrycount != 0)
2383 timevar_push (TV_SYMOUT);
2384 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2385 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2386 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2388 #ifdef SDB_DEBUGGING_INFO
2389 if (write_symbols == SDB_DEBUG)
2390 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2392 #ifdef DWARF2_DEBUGGING_INFO
2393 if ((write_symbols == DWARF2_DEBUG
2394 || write_symbols == VMS_AND_DWARF2_DEBUG)
2396 dwarf2out_decl (TYPE_STUB_DECL (type));
2398 timevar_pop (TV_SYMOUT);
2401 /* This is called from finish_function (within langhooks.parse_file)
2402 after each top-level definition is parsed.
2403 It is supposed to compile that function or variable
2404 and output the assembler code for it.
2405 After we return, the tree storage is freed. */
2408 rest_of_compilation (decl)
2414 int rebuild_label_notes_after_reload;
2416 timevar_push (TV_REST_OF_COMPILATION);
2418 /* Now that we're out of the frontend, we shouldn't have any more
2419 CONCATs anywhere. */
2420 generating_concat_p = 0;
2422 /* When processing delayed functions, prepare_function_start() won't
2423 have been run to re-initialize it. */
2424 cse_not_expected = ! optimize;
2426 /* First, make sure that NOTE_BLOCK is set correctly for each
2427 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2428 if (!cfun->x_whole_function_mode_p)
2431 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2432 tree in sensible shape. So, we just recalculate it here. */
2433 if (cfun->x_whole_function_mode_p)
2438 /* If we are reconsidering an inline function
2439 at the end of compilation, skip the stuff for making it inline. */
2441 if (DECL_SAVED_INSNS (decl) == 0)
2447 /* If this is nested inside an inlined external function, pretend
2448 it was only declared. Since we cannot inline such functions,
2449 generating code for this one is not only not necessary but will
2450 confuse some debugging output writers. */
2451 for (parent = DECL_CONTEXT (current_function_decl);
2452 parent != NULL_TREE;
2453 parent = get_containing_scope (parent))
2454 if (TREE_CODE (parent) == FUNCTION_DECL
2455 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2457 DECL_INITIAL (decl) = 0;
2458 goto exit_rest_of_compilation;
2460 else if (TYPE_P (parent))
2461 /* A function in a local class should be treated normally. */
2464 /* If requested, consider whether to make this function inline. */
2465 if ((DECL_INLINE (decl) && !flag_no_inline)
2466 || flag_inline_functions)
2468 timevar_push (TV_INTEGRATION);
2469 lose = function_cannot_inline_p (decl);
2470 timevar_pop (TV_INTEGRATION);
2471 if (lose || ! optimize)
2473 if (warn_inline && DECL_INLINE (decl))
2474 warning_with_decl (decl, lose);
2475 DECL_ABSTRACT_ORIGIN (decl) = 0;
2476 /* Don't really compile an extern inline function.
2477 If we can't make it inline, pretend
2478 it was only declared. */
2479 if (DECL_EXTERNAL (decl))
2481 DECL_INITIAL (decl) = 0;
2482 goto exit_rest_of_compilation;
2486 /* ??? Note that we used to just make it look like if
2487 the "inline" keyword was specified when we decide
2488 to inline it (because of -finline-functions).
2489 garloff@suse.de, 2002-04-24: Add another flag to
2490 actually record this piece of information. */
2491 if (!DECL_INLINE (decl))
2492 DID_INLINE_FUNC (decl) = 1;
2493 inlinable = DECL_INLINE (decl) = 1;
2497 insns = get_insns ();
2499 /* Dump the rtl code if we are dumping rtl. */
2501 if (open_dump_file (DFI_rtl, decl))
2503 if (DECL_SAVED_INSNS (decl))
2504 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2505 close_dump_file (DFI_rtl, print_rtl, insns);
2508 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2509 sorts of eh initialization. Delay this until after the
2510 initial rtl dump so that we can see the original nesting. */
2511 convert_from_eh_region_ranges ();
2513 /* If function is inline, and we don't yet know whether to
2514 compile it by itself, defer decision till end of compilation.
2515 wrapup_global_declarations will (indirectly) call
2516 rest_of_compilation again for those functions that need to
2517 be output. Also defer those functions that we are supposed
2521 || (DECL_INLINE (decl)
2522 && flag_inline_functions
2523 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2524 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2525 && ! flag_keep_inline_functions)
2526 || DECL_EXTERNAL (decl))))
2527 DECL_DEFER_OUTPUT (decl) = 1;
2529 if (DECL_INLINE (decl))
2530 /* DWARF wants separate debugging info for abstract and
2531 concrete instances of all inline functions, including those
2532 declared inline but not inlined, and those inlined even
2533 though they weren't declared inline. Conveniently, that's
2534 what DECL_INLINE means at this point. */
2535 (*debug_hooks->deferred_inline_function) (decl);
2537 if (DECL_DEFER_OUTPUT (decl))
2539 /* If -Wreturn-type, we have to do a bit of compilation. We just
2540 want to call cleanup the cfg to figure out whether or not we can
2541 fall off the end of the function; we do the minimum amount of
2542 work necessary to make that safe. */
2543 if (warn_return_type)
2545 int saved_optimize = optimize;
2548 rebuild_jump_labels (insns);
2549 find_exception_handler_labels ();
2550 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2551 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2552 optimize = saved_optimize;
2554 /* CFG is no longer maintained up-to-date. */
2555 free_bb_for_insn ();
2558 set_nothrow_function_flags ();
2559 if (current_function_nothrow)
2560 /* Now we know that this can't throw; set the flag for the benefit
2561 of other functions later in this translation unit. */
2562 TREE_NOTHROW (current_function_decl) = 1;
2564 timevar_push (TV_INTEGRATION);
2565 save_for_inline (decl);
2566 timevar_pop (TV_INTEGRATION);
2567 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2568 goto exit_rest_of_compilation;
2571 /* If specified extern inline but we aren't inlining it, we are
2572 done. This goes for anything that gets here with DECL_EXTERNAL
2573 set, not just things with DECL_INLINE. */
2574 if (DECL_EXTERNAL (decl))
2575 goto exit_rest_of_compilation;
2578 /* If we're emitting a nested function, make sure its parent gets
2579 emitted as well. Doing otherwise confuses debug info. */
2582 for (parent = DECL_CONTEXT (current_function_decl);
2583 parent != NULL_TREE;
2584 parent = get_containing_scope (parent))
2585 if (TREE_CODE (parent) == FUNCTION_DECL)
2586 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2589 /* We are now committed to emitting code for this function. Do any
2590 preparation, such as emitting abstract debug info for the inline
2591 before it gets mangled by optimization. */
2592 if (DECL_INLINE (decl))
2593 (*debug_hooks->outlining_inline_function) (decl);
2595 /* Remove any notes we don't need. That will make iterating
2596 over the instruction sequence faster, and allow the garbage
2597 collector to reclaim the memory used by the notes. */
2598 remove_unnecessary_notes ();
2603 /* Initialize some variables used by the optimizers. */
2604 init_function_for_compilation ();
2606 if (! DECL_DEFER_OUTPUT (decl))
2607 TREE_ASM_WRITTEN (decl) = 1;
2609 /* Now that integrate will no longer see our rtl, we need not
2610 distinguish between the return value of this function and the
2611 return value of called functions. Also, we can remove all SETs
2612 of subregs of hard registers; they are only here because of
2613 integrate. Also, we can now initialize pseudos intended to
2614 carry magic hard reg data throughout the function. */
2615 rtx_equal_function_value_matters = 0;
2616 purge_hard_subreg_sets (get_insns ());
2618 /* Early return if there were errors. We can run afoul of our
2619 consistency checks, and there's not really much point in fixing them.
2620 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2621 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2622 || errorcount || sorrycount)
2623 goto exit_rest_of_compilation;
2625 timevar_push (TV_JUMP);
2626 open_dump_file (DFI_sibling, decl);
2627 insns = get_insns ();
2628 rebuild_jump_labels (insns);
2629 find_exception_handler_labels ();
2630 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2632 delete_unreachable_blocks ();
2634 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2635 if (flag_guess_branch_prob)
2637 timevar_push (TV_BRANCH_PROB);
2638 note_prediction_to_br_prob ();
2639 timevar_pop (TV_BRANCH_PROB);
2642 /* We may have potential sibling or tail recursion sites. Select one
2643 (of possibly multiple) methods of performing the call. */
2644 if (flag_optimize_sibling_calls)
2647 optimize_sibling_and_tail_recursive_calls ();
2649 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2650 free_bb_for_insn ();
2651 find_exception_handler_labels ();
2652 rebuild_jump_labels (insns);
2653 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2655 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2656 notes before simplifying cfg and we must do lowering after sibcall
2657 that unhides parts of RTL chain and cleans up the CFG.
2659 Until sibcall is replaced by tree-level optimizer, lets just
2660 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2661 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2662 if (GET_CODE (insn) == NOTE
2663 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2666 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2667 timevar_pop (TV_JUMP);
2669 scope_to_insns_initialize ();
2670 /* Complete generation of exception handling code. */
2673 timevar_push (TV_JUMP);
2674 open_dump_file (DFI_eh, decl);
2676 finish_eh_generation ();
2678 close_dump_file (DFI_eh, print_rtl, get_insns ());
2679 timevar_pop (TV_JUMP);
2682 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2683 generation, which might create new sets. */
2684 emit_initial_value_sets ();
2687 /* If we are doing position-independent code generation, now
2688 is the time to output special prologues and epilogues.
2689 We do not want to do this earlier, because it just clutters
2690 up inline functions with meaningless insns. */
2695 insns = get_insns ();
2697 /* Copy any shared structure that should not be shared. */
2698 unshare_all_rtl (current_function_decl, insns);
2700 #ifdef SETJMP_VIA_SAVE_AREA
2701 /* This must be performed before virtual register instantiation.
2702 Please be aware the everything in the compiler that can look
2703 at the RTL up to this point must understand that REG_SAVE_AREA
2704 is just like a use of the REG contained inside. */
2705 if (current_function_calls_alloca)
2706 optimize_save_area_alloca (insns);
2709 /* Instantiate all virtual registers. */
2710 instantiate_virtual_regs (current_function_decl, insns);
2712 open_dump_file (DFI_jump, decl);
2714 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2715 are initialized and to compute whether control can drop off the end
2718 timevar_push (TV_JUMP);
2719 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2720 before jump optimization switches branch directions. */
2721 if (flag_guess_branch_prob)
2722 expected_value_to_br_prob ();
2724 reg_scan (insns, max_reg_num (), 0);
2725 rebuild_jump_labels (insns);
2726 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2727 delete_trivially_dead_insns (insns, max_reg_num ());
2729 dump_flow_info (rtl_dump_file);
2730 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2731 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2735 free_bb_for_insn ();
2736 copy_loop_headers (insns);
2737 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2739 purge_line_number_notes (insns);
2741 timevar_pop (TV_JUMP);
2742 close_dump_file (DFI_jump, print_rtl, insns);
2744 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2745 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2747 goto exit_rest_of_compilation;
2750 /* Long term, this should probably move before the jump optimizer too,
2751 but I didn't want to disturb the rtl_dump_and_exit and related
2752 stuff at this time. */
2753 if (optimize > 0 && flag_ssa)
2755 /* Convert to SSA form. */
2757 timevar_push (TV_TO_SSA);
2758 open_dump_file (DFI_ssa, decl);
2760 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2763 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2764 timevar_pop (TV_TO_SSA);
2766 /* Perform sparse conditional constant propagation, if requested. */
2769 timevar_push (TV_SSA_CCP);
2770 open_dump_file (DFI_ssa_ccp, decl);
2774 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2775 timevar_pop (TV_SSA_CCP);
2778 /* It would be useful to cleanup the CFG at this point, but block
2779 merging and possibly other transformations might leave a PHI
2780 node in the middle of a basic block, which is a strict no-no. */
2782 /* The SSA implementation uses basic block numbers in its phi
2783 nodes. Thus, changing the control-flow graph or the basic
2784 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2785 may cause problems. */
2789 /* Remove dead code. */
2791 timevar_push (TV_SSA_DCE);
2792 open_dump_file (DFI_ssa_dce, decl);
2794 insns = get_insns ();
2795 ssa_eliminate_dead_code ();
2797 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2798 timevar_pop (TV_SSA_DCE);
2801 /* Convert from SSA form. */
2803 timevar_push (TV_FROM_SSA);
2804 open_dump_file (DFI_ussa, decl);
2806 convert_from_ssa ();
2807 /* New registers have been created. Rescan their usage. */
2808 reg_scan (insns, max_reg_num (), 1);
2810 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2811 timevar_pop (TV_FROM_SSA);
2816 timevar_push (TV_JUMP);
2818 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2820 /* Try to identify useless null pointer tests and delete them. */
2821 if (flag_delete_null_pointer_checks)
2823 open_dump_file (DFI_null, decl);
2825 dump_flow_info (rtl_dump_file);
2827 if (delete_null_pointer_checks (insns))
2828 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2830 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2833 /* Jump optimization, and the removal of NULL pointer checks, may
2834 have reduced the number of instructions substantially. CSE, and
2835 future passes, allocate arrays whose dimensions involve the
2836 maximum instruction UID, so if we can reduce the maximum UID
2837 we'll save big on memory. */
2838 renumber_insns (rtl_dump_file);
2839 timevar_pop (TV_JUMP);
2841 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2845 /* Perform common subexpression elimination.
2846 Nonzero value from `cse_main' means that jumps were simplified
2847 and some code may now be unreachable, so do
2848 jump optimization again. */
2852 open_dump_file (DFI_cse, decl);
2854 dump_flow_info (rtl_dump_file);
2855 timevar_push (TV_CSE);
2857 reg_scan (insns, max_reg_num (), 1);
2859 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2861 rebuild_jump_labels (insns);
2862 purge_all_dead_edges (0);
2864 delete_trivially_dead_insns (insns, max_reg_num ());
2866 /* If we are not running more CSE passes, then we are no longer
2867 expecting CSE to be run. But always rerun it in a cheap mode. */
2868 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2870 if (tem || optimize > 1)
2871 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2872 /* Try to identify useless null pointer tests and delete them. */
2873 if (flag_delete_null_pointer_checks)
2875 timevar_push (TV_JUMP);
2877 if (delete_null_pointer_checks (insns))
2878 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2879 timevar_pop (TV_JUMP);
2882 /* The second pass of jump optimization is likely to have
2883 removed a bunch more instructions. */
2884 renumber_insns (rtl_dump_file);
2886 timevar_pop (TV_CSE);
2887 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2890 open_dump_file (DFI_addressof, decl);
2892 purge_addressof (insns);
2894 purge_all_dead_edges (0);
2895 reg_scan (insns, max_reg_num (), 1);
2897 close_dump_file (DFI_addressof, print_rtl, insns);
2901 /* Perform global cse. */
2903 if (optimize > 0 && flag_gcse)
2905 int save_csb, save_cfj;
2908 timevar_push (TV_GCSE);
2909 open_dump_file (DFI_gcse, decl);
2911 tem = gcse_main (insns, rtl_dump_file);
2912 rebuild_jump_labels (insns);
2913 delete_trivially_dead_insns (insns, max_reg_num ());
2915 save_csb = flag_cse_skip_blocks;
2916 save_cfj = flag_cse_follow_jumps;
2917 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2919 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2921 if (flag_expensive_optimizations)
2923 timevar_push (TV_CSE);
2924 reg_scan (insns, max_reg_num (), 1);
2925 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2926 purge_all_dead_edges (0);
2927 delete_trivially_dead_insns (insns, max_reg_num ());
2928 timevar_pop (TV_CSE);
2929 cse_not_expected = !flag_rerun_cse_after_loop;
2932 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2933 things up. Then possibly re-run CSE again. */
2937 timevar_push (TV_JUMP);
2938 rebuild_jump_labels (insns);
2939 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2940 timevar_pop (TV_JUMP);
2942 if (flag_expensive_optimizations)
2944 timevar_push (TV_CSE);
2945 reg_scan (insns, max_reg_num (), 1);
2946 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2947 purge_all_dead_edges (0);
2948 delete_trivially_dead_insns (insns, max_reg_num ());
2949 timevar_pop (TV_CSE);
2953 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2954 timevar_pop (TV_GCSE);
2957 flag_cse_skip_blocks = save_csb;
2958 flag_cse_follow_jumps = save_cfj;
2959 #ifdef ENABLE_CHECKING
2960 verify_flow_info ();
2964 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2965 if (optimize > 0 && flag_gcse && current_function_calls_constant_p)
2966 purge_builtin_constant_p ();
2968 /* Move constant computations out of loops. */
2970 if (optimize > 0 && flag_loop_optimize)
2972 int do_unroll, do_prefetch;
2974 timevar_push (TV_LOOP);
2975 delete_dead_jumptables ();
2976 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2977 open_dump_file (DFI_loop, decl);
2978 /* CFG is no longer maintained up-to-date. */
2979 free_bb_for_insn ();
2981 if (flag_unroll_loops)
2982 do_unroll = 0; /* Having two unrollers is useless. */
2984 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2985 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2986 if (flag_rerun_loop_opt)
2988 cleanup_barriers ();
2990 /* We only want to perform unrolling once. */
2991 loop_optimize (insns, rtl_dump_file, do_unroll);
2994 /* The first call to loop_optimize makes some instructions
2995 trivially dead. We delete those instructions now in the
2996 hope that doing so will make the heuristics in loop work
2997 better and possibly speed up compilation. */
2998 delete_trivially_dead_insns (insns, max_reg_num ());
3000 /* The regscan pass is currently necessary as the alias
3001 analysis code depends on this information. */
3002 reg_scan (insns, max_reg_num (), 1);
3004 cleanup_barriers ();
3005 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3007 /* Loop can create trivially dead instructions. */
3008 delete_trivially_dead_insns (insns, max_reg_num ());
3009 close_dump_file (DFI_loop, print_rtl, insns);
3010 timevar_pop (TV_LOOP);
3011 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3016 /* Perform jump bypassing and control flow optimizations. */
3017 if (optimize > 0 && flag_gcse)
3019 timevar_push (TV_BYPASS);
3020 open_dump_file (DFI_bypass, decl);
3022 cleanup_cfg (CLEANUP_EXPENSIVE);
3023 tem = bypass_jumps (rtl_dump_file);
3027 rebuild_jump_labels (insns);
3028 cleanup_cfg (CLEANUP_EXPENSIVE);
3029 delete_trivially_dead_insns (insns, max_reg_num ());
3032 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
3033 timevar_pop (TV_BYPASS);
3037 #ifdef ENABLE_CHECKING
3038 verify_flow_info ();
3042 /* Do control and data flow analysis; wrote some of the results to
3045 timevar_push (TV_FLOW);
3046 open_dump_file (DFI_cfg, decl);
3048 dump_flow_info (rtl_dump_file);
3050 cleanup_cfg (CLEANUP_EXPENSIVE
3051 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3053 /* It may make more sense to mark constant functions after dead code is
3054 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3055 may insert code making function non-constant, but we still must consider
3056 it as constant, otherwise -fbranch-probabilities will not read data back.
3058 life_analysis rarely eliminates modification of external memory.
3061 mark_constant_function ();
3063 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3065 /* Do branch profiling and static profile estimation passes. */
3066 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3070 timevar_push (TV_BRANCH_PROB);
3071 open_dump_file (DFI_bp, decl);
3072 if (cfun->arc_profile || flag_branch_probabilities)
3075 /* Discover and record the loop depth at the head of each basic
3076 block. The loop infrastructure does the real job for us. */
3077 flow_loops_find (&loops, LOOP_TREE);
3080 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3082 /* Estimate using heuristics if no profiling info is available. */
3083 if (flag_guess_branch_prob)
3084 estimate_probability (&loops);
3086 flow_loops_free (&loops);
3087 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3088 timevar_pop (TV_BRANCH_PROB);
3092 open_dump_file (DFI_ce1, decl);
3093 if (flag_if_conversion)
3095 timevar_push (TV_IFCVT);
3097 dump_flow_info (rtl_dump_file);
3098 cleanup_cfg (CLEANUP_EXPENSIVE);
3099 reg_scan (insns, max_reg_num (), 0);
3101 timevar_pop (TV_IFCVT);
3103 timevar_push (TV_JUMP);
3104 cleanup_cfg (CLEANUP_EXPENSIVE);
3105 reg_scan (insns, max_reg_num (), 0);
3106 timevar_pop (TV_JUMP);
3107 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3111 timevar_push (TV_TRACER);
3112 open_dump_file (DFI_tracer, decl);
3114 dump_flow_info (rtl_dump_file);
3116 cleanup_cfg (CLEANUP_EXPENSIVE);
3117 reg_scan (insns, max_reg_num (), 0);
3118 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3119 timevar_pop (TV_TRACER);
3122 /* Perform loop optimalizations. It might be better to do them a bit
3123 sooner, but we want the profile feedback to work more efficiently. */
3125 && (flag_unswitch_loops
3127 || flag_unroll_loops))
3129 struct loops *loops;
3130 timevar_push (TV_LOOP);
3131 open_dump_file (DFI_loop2, decl);
3133 dump_flow_info (rtl_dump_file);
3135 loops = loop_optimizer_init (rtl_dump_file);
3139 /* The optimalizations: */
3140 if (flag_unswitch_loops)
3141 unswitch_loops (loops);
3143 if (flag_peel_loops || flag_unroll_loops)
3144 unroll_and_peel_loops (loops,
3145 (flag_peel_loops ? UAP_PEEL : 0) |
3146 (flag_unroll_loops ? UAP_UNROLL : 0) |
3147 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3149 loop_optimizer_finalize (loops, rtl_dump_file);
3152 cleanup_cfg (CLEANUP_EXPENSIVE);
3153 delete_trivially_dead_insns (insns, max_reg_num ());
3154 reg_scan (insns, max_reg_num (), 0);
3156 dump_flow_info (rtl_dump_file);
3157 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3158 timevar_pop (TV_LOOP);
3162 if (flag_rerun_cse_after_loop)
3164 timevar_push (TV_CSE2);
3165 open_dump_file (DFI_cse2, decl);
3167 dump_flow_info (rtl_dump_file);
3168 /* CFG is no longer maintained up-to-date. */
3169 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3170 purge_all_dead_edges (0);
3171 delete_trivially_dead_insns (insns, max_reg_num ());
3175 timevar_push (TV_JUMP);
3176 rebuild_jump_labels (insns);
3177 cleanup_cfg (CLEANUP_EXPENSIVE);
3178 timevar_pop (TV_JUMP);
3180 reg_scan (insns, max_reg_num (), 0);
3181 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3183 timevar_pop (TV_CSE2);
3186 cse_not_expected = 1;
3188 open_dump_file (DFI_life, decl);
3191 check_function_return_warnings ();
3193 #ifdef ENABLE_CHECKING
3194 verify_flow_info ();
3196 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3198 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3199 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3200 timevar_pop (TV_FLOW);
3204 if (warn_uninitialized || extra_warnings)
3206 uninitialized_vars_warning (DECL_INITIAL (decl));
3208 setjmp_args_warning ();
3214 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3216 /* Insns were inserted, so things might look a bit different. */
3217 insns = get_insns ();
3218 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3219 PROP_LOG_LINKS | PROP_REG_INFO
3220 | PROP_DEATH_NOTES);
3224 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3228 /* If -opt, try combining insns through substitution. */
3232 int rebuild_jump_labels_after_combine = 0;
3234 timevar_push (TV_COMBINE);
3235 open_dump_file (DFI_combine, decl);
3237 rebuild_jump_labels_after_combine
3238 = combine_instructions (insns, max_reg_num ());
3240 /* Combining insns may have turned an indirect jump into a
3241 direct jump. Rebuild the JUMP_LABEL fields of jumping
3243 if (rebuild_jump_labels_after_combine)
3245 timevar_push (TV_JUMP);
3246 rebuild_jump_labels (insns);
3247 timevar_pop (TV_JUMP);
3249 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3252 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3253 timevar_pop (TV_COMBINE);
3258 /* Rerun if-conversion, as combine may have simplified things enough to
3259 now meet sequence length restrictions. */
3260 if (flag_if_conversion)
3262 timevar_push (TV_IFCVT);
3263 open_dump_file (DFI_ce2, decl);
3269 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3270 timevar_pop (TV_IFCVT);
3273 /* Register allocation pre-pass, to reduce number of moves
3274 necessary for two-address machines. */
3275 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3277 timevar_push (TV_REGMOVE);
3278 open_dump_file (DFI_regmove, decl);
3280 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3282 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3283 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3284 timevar_pop (TV_REGMOVE);
3289 /* Do unconditional splitting before register allocation to allow machine
3290 description to add extra information not needed previously. */
3291 split_all_insns (1);
3293 #ifdef OPTIMIZE_MODE_SWITCHING
3294 timevar_push (TV_MODE_SWITCH);
3297 optimize_mode_switching (NULL);
3300 timevar_pop (TV_MODE_SWITCH);
3303 /* Any of the several passes since flow1 will have munged register
3304 lifetime data a bit. We need it to be up to date for scheduling
3305 (see handling of reg_known_equiv in init_alias_analysis). */
3306 recompute_reg_usage (insns, !optimize_size);
3308 timevar_push (TV_SCHED);
3310 #ifdef INSN_SCHEDULING
3312 /* Print function header into sched dump now
3313 because doing the sched analysis makes some of the dump. */
3314 if (optimize > 0 && flag_schedule_insns)
3316 open_dump_file (DFI_sched, decl);
3318 /* Do control and data sched analysis,
3319 and write some of the results to dump file. */
3321 schedule_insns (rtl_dump_file);
3323 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3326 timevar_pop (TV_SCHED);
3330 /* Determine if the current function is a leaf before running reload
3331 since this can impact optimizations done by the prologue and
3332 epilogue thus changing register elimination offsets. */
3333 current_function_is_leaf = leaf_function_p ();
3335 timevar_push (TV_LOCAL_ALLOC);
3336 open_dump_file (DFI_lreg, decl);
3338 /* Allocate pseudo-regs that are used only within 1 basic block.
3340 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3341 jump optimizer after register allocation and reloading are finished. */
3343 if (flag_new_regalloc)
3345 delete_trivially_dead_insns (insns, max_reg_num ());
3348 timevar_pop (TV_LOCAL_ALLOC);
3349 if (dump_file[DFI_lreg].enabled)
3351 timevar_push (TV_DUMP);
3353 close_dump_file (DFI_lreg, NULL, NULL);
3354 timevar_pop (TV_DUMP);
3357 /* XXX clean up the whole mess to bring live info in shape again. */
3358 timevar_push (TV_GLOBAL_ALLOC);
3359 open_dump_file (DFI_greg, decl);
3361 build_insn_chain (insns);
3362 failure = reload (insns, 0);
3364 timevar_pop (TV_GLOBAL_ALLOC);
3366 if (dump_file[DFI_greg].enabled)
3368 timevar_push (TV_DUMP);
3370 dump_global_regs (rtl_dump_file);
3372 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3373 timevar_pop (TV_DUMP);
3377 goto exit_rest_of_compilation;
3378 reload_completed = 1;
3379 rebuild_label_notes_after_reload = 0;
3383 /* Allocate the reg_renumber array. */
3384 allocate_reg_info (max_regno, FALSE, TRUE);
3386 /* And the reg_equiv_memory_loc array. */
3387 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3389 allocate_initial_values (reg_equiv_memory_loc);
3391 regclass (insns, max_reg_num (), rtl_dump_file);
3392 rebuild_label_notes_after_reload = local_alloc ();
3394 timevar_pop (TV_LOCAL_ALLOC);
3396 if (dump_file[DFI_lreg].enabled)
3398 timevar_push (TV_DUMP);
3400 dump_flow_info (rtl_dump_file);
3401 dump_local_alloc (rtl_dump_file);
3403 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3404 timevar_pop (TV_DUMP);
3409 timevar_push (TV_GLOBAL_ALLOC);
3410 open_dump_file (DFI_greg, decl);
3412 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3413 pass fixing up any insns that are invalid. */
3416 failure = global_alloc (rtl_dump_file);
3419 build_insn_chain (insns);
3420 failure = reload (insns, 0);
3423 timevar_pop (TV_GLOBAL_ALLOC);
3425 if (dump_file[DFI_greg].enabled)
3427 timevar_push (TV_DUMP);
3429 dump_global_regs (rtl_dump_file);
3431 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3432 timevar_pop (TV_DUMP);
3436 goto exit_rest_of_compilation;
3441 open_dump_file (DFI_postreload, decl);
3443 /* Do a very simple CSE pass over just the hard registers. */
3446 timevar_push (TV_RELOAD_CSE_REGS);
3447 reload_cse_regs (insns);
3448 timevar_pop (TV_RELOAD_CSE_REGS);
3451 /* Register allocation and reloading may have turned an indirect jump into
3452 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3453 jumping instructions. */
3454 if (rebuild_label_notes_after_reload)
3456 timevar_push (TV_JUMP);
3458 rebuild_jump_labels (insns);
3459 purge_all_dead_edges (0);
3461 timevar_pop (TV_JUMP);
3464 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3466 /* Re-create the death notes which were deleted during reload. */
3467 timevar_push (TV_FLOW2);
3468 open_dump_file (DFI_flow2, decl);
3470 #ifdef ENABLE_CHECKING
3471 verify_flow_info ();
3474 /* If optimizing, then go ahead and split insns now. */
3478 split_all_insns (0);
3481 cleanup_cfg (CLEANUP_EXPENSIVE);
3483 /* On some machines, the prologue and epilogue code, or parts thereof,
3484 can be represented as RTL. Doing so lets us schedule insns between
3485 it and the rest of the code and also allows delayed branch
3486 scheduling to operate in the epilogue. */
3487 thread_prologue_and_epilogue_insns (insns);
3491 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3492 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3493 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3495 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3496 even for machines with possibly nonzero RETURN_POPS_ARGS
3497 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3498 push instructions will have popping returns. */
3499 #ifndef PUSH_ROUNDING
3500 if (!ACCUMULATE_OUTGOING_ARGS)
3502 combine_stack_adjustments ();
3507 flow2_completed = 1;
3509 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3510 timevar_pop (TV_FLOW2);
3512 #ifdef HAVE_peephole2
3513 if (optimize > 0 && flag_peephole2)
3515 timevar_push (TV_PEEPHOLE2);
3516 open_dump_file (DFI_peephole2, decl);
3518 peephole2_optimize (rtl_dump_file);
3520 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3521 timevar_pop (TV_PEEPHOLE2);
3525 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3527 timevar_push (TV_RENAME_REGISTERS);
3528 open_dump_file (DFI_rnreg, decl);
3530 if (flag_rename_registers)
3531 regrename_optimize ();
3532 if (flag_cprop_registers)
3533 copyprop_hardreg_forward ();
3535 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3536 timevar_pop (TV_RENAME_REGISTERS);
3541 timevar_push (TV_REORDER_BLOCKS);
3542 open_dump_file (DFI_bbro, decl);
3544 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3545 splitting possibly introduced more crossjumping opportunities. */
3546 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3547 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3549 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
3551 if (flag_reorder_blocks)
3552 reorder_basic_blocks ();
3553 if (flag_reorder_blocks
3554 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
3555 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3557 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3558 timevar_pop (TV_REORDER_BLOCKS);
3561 if (flag_if_conversion2)
3563 timevar_push (TV_IFCVT2);
3564 open_dump_file (DFI_ce3, decl);
3568 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3569 timevar_pop (TV_IFCVT2);
3572 #ifdef INSN_SCHEDULING
3573 if (optimize > 0 && flag_schedule_insns_after_reload)
3575 timevar_push (TV_SCHED2);
3576 open_dump_file (DFI_sched2, decl);
3578 /* Do control and data sched analysis again,
3579 and write some more of the results to dump file. */
3581 split_all_insns (1);
3583 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
3585 schedule_ebbs (rtl_dump_file);
3586 /* No liveness updating code yet, but it should be easy to do.
3587 reg-stack recompute the liveness when needed for now. */
3588 count_or_remove_death_notes (NULL, 1);
3589 cleanup_cfg (CLEANUP_EXPENSIVE);
3592 schedule_insns (rtl_dump_file);
3594 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3595 timevar_pop (TV_SCHED2);
3601 #ifdef LEAF_REGISTERS
3602 current_function_uses_only_leaf_regs
3603 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3607 timevar_push (TV_REG_STACK);
3608 open_dump_file (DFI_stack, decl);
3610 if (reg_to_stack (insns, rtl_dump_file) && optimize)
3612 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3613 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
3614 && flag_reorder_blocks)
3616 reorder_basic_blocks ();
3617 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3621 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3622 timevar_pop (TV_REG_STACK);
3626 compute_alignments ();
3628 /* CFG is no longer maintained up-to-date. */
3629 free_bb_for_insn ();
3631 /* If a machine dependent reorganization is needed, call it. */
3632 #ifdef MACHINE_DEPENDENT_REORG
3633 timevar_push (TV_MACH_DEP);
3634 open_dump_file (DFI_mach, decl);
3636 MACHINE_DEPENDENT_REORG (insns);
3638 close_dump_file (DFI_mach, print_rtl, insns);
3639 timevar_pop (TV_MACH_DEP);
3644 purge_line_number_notes (insns);
3645 cleanup_barriers ();
3647 /* If a scheduling pass for delayed branches is to be done,
3648 call the scheduling code. */
3651 if (optimize > 0 && flag_delayed_branch)
3653 timevar_push (TV_DBR_SCHED);
3654 open_dump_file (DFI_dbr, decl);
3656 dbr_schedule (insns, rtl_dump_file);
3658 close_dump_file (DFI_dbr, print_rtl, insns);
3659 timevar_pop (TV_DBR_SCHED);
3665 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3666 timevar_push (TV_SHORTEN_BRANCH);
3667 split_all_insns_noflow ();
3668 timevar_pop (TV_SHORTEN_BRANCH);
3671 convert_to_eh_region_ranges ();
3673 /* Shorten branches. */
3674 timevar_push (TV_SHORTEN_BRANCH);
3675 shorten_branches (get_insns ());
3676 timevar_pop (TV_SHORTEN_BRANCH);
3678 set_nothrow_function_flags ();
3679 if (current_function_nothrow)
3680 /* Now we know that this can't throw; set the flag for the benefit
3681 of other functions later in this translation unit. */
3682 TREE_NOTHROW (current_function_decl) = 1;
3684 /* Now turn the rtl into assembler code. */
3686 timevar_push (TV_FINAL);
3691 /* Get the function's name, as described by its RTL. This may be
3692 different from the DECL_NAME name used in the source file. */
3694 x = DECL_RTL (decl);
3695 if (GET_CODE (x) != MEM)
3698 if (GET_CODE (x) != SYMBOL_REF)
3700 fnname = XSTR (x, 0);
3702 assemble_start_function (decl, fnname);
3703 final_start_function (insns, asm_out_file, optimize);
3704 final (insns, asm_out_file, optimize, 0);
3705 final_end_function ();
3707 #ifdef IA64_UNWIND_INFO
3708 /* ??? The IA-64 ".handlerdata" directive must be issued before
3709 the ".endp" directive that closes the procedure descriptor. */
3710 output_function_exception_table ();
3713 assemble_end_function (decl, fnname);
3715 #ifndef IA64_UNWIND_INFO
3716 /* Otherwise, it feels unclean to switch sections in the middle. */
3717 output_function_exception_table ();
3721 fflush (asm_out_file);
3723 /* Release all memory allocated by flow. */
3724 free_basic_block_vars (0);
3726 /* Release all memory held by regsets now. */
3727 regset_release_memory ();
3729 timevar_pop (TV_FINAL);
3733 /* Write DBX symbols if requested. */
3735 /* Note that for those inline functions where we don't initially
3736 know for certain that we will be generating an out-of-line copy,
3737 the first invocation of this routine (rest_of_compilation) will
3738 skip over this code by doing a `goto exit_rest_of_compilation;'.
3739 Later on, wrapup_global_declarations will (indirectly) call
3740 rest_of_compilation again for those inline functions that need
3741 to have out-of-line copies generated. During that call, we
3742 *will* be routed past here. */
3744 timevar_push (TV_SYMOUT);
3745 (*debug_hooks->function_decl) (decl);
3746 timevar_pop (TV_SYMOUT);
3748 exit_rest_of_compilation:
3750 /* In case the function was not output,
3751 don't leave any temporary anonymous types
3752 queued up for sdb output. */
3753 #ifdef SDB_DEBUGGING_INFO
3754 if (write_symbols == SDB_DEBUG)
3755 sdbout_types (NULL_TREE);
3758 reload_completed = 0;
3759 flow2_completed = 0;
3762 timevar_push (TV_FINAL);
3764 /* Clear out the insn_length contents now that they are no
3766 init_insn_lengths ();
3768 /* Show no temporary slots allocated. */
3771 free_basic_block_vars (0);
3772 free_bb_for_insn ();
3774 timevar_pop (TV_FINAL);
3776 if ((*targetm.binds_local_p) (current_function_decl))
3778 int pref = cfun->preferred_stack_boundary;
3779 if (cfun->recursive_call_emit
3780 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3781 pref = cfun->stack_alignment_needed;
3782 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3786 /* Make sure volatile mem refs aren't considered valid operands for
3787 arithmetic insns. We must call this here if this is a nested inline
3788 function, since the above code leaves us in the init_recog state
3789 (from final.c), and the function context push/pop code does not
3790 save/restore volatile_ok.
3792 ??? Maybe it isn't necessary for expand_start_function to call this
3793 anymore if we do it here? */
3795 init_recog_no_volatile ();
3797 /* We're done with this function. Free up memory if we can. */
3798 free_after_parsing (cfun);
3799 if (! DECL_DEFER_OUTPUT (decl))
3801 free_after_compilation (cfun);
3803 /* Clear integrate.c's pointer to the cfun structure we just
3805 DECL_SAVED_INSNS (decl) = 0;
3811 timevar_pop (TV_REST_OF_COMPILATION);
3821 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3822 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3823 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3824 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3825 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3826 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"));
3827 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3829 for (i = ARRAY_SIZE (f_options); i--;)
3831 const char *description = f_options[i].description;
3833 if (description != NULL && *description != 0)
3834 printf (" -f%-21s %s\n",
3835 f_options[i].string, _(description));
3838 printf (_(" -O[number] Set optimization level to [number]\n"));
3839 printf (_(" -Os Optimize for space rather than speed\n"));
3840 for (i = LAST_PARAM; i--;)
3842 const char *description = compiler_params[i].help;
3843 const int length = 21 - strlen (compiler_params[i].option);
3845 if (description != NULL && *description != 0)
3846 printf (" --param %s=<value>%.*s%s\n",
3847 compiler_params[i].option,
3848 length > 0 ? length : 1, " ",
3851 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3852 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3853 printf (_(" -w Suppress warnings\n"));
3855 for (i = ARRAY_SIZE (W_options); i--;)
3857 const char *description = W_options[i].description;
3859 if (description != NULL && *description != 0)
3860 printf (" -W%-21s %s\n",
3861 W_options[i].string, _(description));
3864 printf (_(" -Wunused Enable unused warnings\n"));
3865 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3866 printf (_(" -p Enable function profiling\n"));
3867 printf (_(" -o <file> Place output into <file> \n"));
3869 -G <number> Put global and static data smaller than <number>\n\
3870 bytes into a special section (on some targets)\n"));
3872 for (i = ARRAY_SIZE (debug_args); i--;)
3874 if (debug_args[i].description != NULL)
3875 printf (" -g%-21s %s\n",
3876 debug_args[i].arg, _(debug_args[i].description));
3879 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3880 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3881 printf (_(" -version Display the compiler's version\n"));
3882 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3883 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3884 #if defined INSN_SCHEDULING
3885 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3887 printf (_(" --help Display this information\n"));
3892 /* Display descriptions of language specific options.
3893 If there is no description, note that there is an undocumented option.
3894 If the description is empty, do not display anything. (This allows
3895 options to be deliberately undocumented, for whatever reason).
3896 If the option string is missing, then this is a marker, indicating
3897 that the description string is in fact the name of a language, whose
3898 language specific options are to follow. */
3900 if (ARRAY_SIZE (documented_lang_options) > 1)
3902 printf (_("\nLanguage specific options:\n"));
3904 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3906 const char *description = documented_lang_options[i].description;
3907 const char *option = documented_lang_options[i].option;
3909 if (description == NULL)
3914 printf (_(" %-23.23s [undocumented]\n"), option);
3916 else if (*description == 0)
3918 else if (option == NULL)
3922 (_("\nThere are undocumented %s specific options as well.\n"),
3926 printf (_("\n Options for %s:\n"), description);
3931 printf (" %-23.23s %s\n", option, _(description));
3936 printf (_("\nThere are undocumented %s specific options as well.\n"),
3939 display_target_options ();
3943 display_target_options ()
3946 static bool displayed = false;
3948 /* Avoid double printing for --help --target-help. */
3953 if (ARRAY_SIZE (target_switches) > 1
3954 #ifdef TARGET_OPTIONS
3955 || ARRAY_SIZE (target_options) > 1
3963 printf (_("\nTarget specific options:\n"));
3965 for (i = ARRAY_SIZE (target_switches); i--;)
3967 const char *option = target_switches[i].name;
3968 const char *description = target_switches[i].description;
3970 if (option == NULL || *option == 0)
3972 else if (description == NULL)
3977 printf (_(" -m%-23.23s [undocumented]\n"), option);
3979 else if (*description != 0)
3980 doc += printf (" -m%-23.23s %s\n", option, _(description));
3983 #ifdef TARGET_OPTIONS
3984 for (i = ARRAY_SIZE (target_options); i--;)
3986 const char *option = target_options[i].prefix;
3987 const char *description = target_options[i].description;
3989 if (option == NULL || *option == 0)
3991 else if (description == NULL)
3996 printf (_(" -m%-23.23s [undocumented]\n"), option);
3998 else if (*description != 0)
3999 doc += printf (" -m%-23.23s %s\n", option, _(description));
4005 printf (_("\nThere are undocumented target specific options as well.\n"));
4007 printf (_(" They exist, but they are not documented.\n"));
4012 /* Parse a -d... command line switch. */
4015 decode_d_option (arg)
4024 for (i = 0; i < (int) DFI_MAX; ++i)
4025 dump_file[i].enabled = 1;
4031 flag_print_asm_name = 1;
4034 flag_dump_rtl_in_asm = 1;
4035 flag_print_asm_name = 1;
4038 graph_dump_format = vcg;
4041 rtl_dump_and_exit = 1;
4046 case 'D': /* These are handled by the preprocessor. */
4050 setup_core_dumping();
4055 for (i = 0; i < (int) DFI_MAX; ++i)
4056 if (c == dump_file[i].debug_switch)
4058 dump_file[i].enabled = 1;
4063 warning ("unrecognized gcc debugging option: %c", c);
4068 /* Parse a -f... command line switch. ARG is the value after the -f.
4069 It is safe to access 'ARG - 2' to generate the full switch name.
4070 Return the number of strings consumed. */
4073 decode_f_option (arg)
4077 const char *option_value = NULL;
4079 /* Search for the option in the table of binary f options. */
4080 for (j = ARRAY_SIZE (f_options); j--;)
4082 if (!strcmp (arg, f_options[j].string))
4084 *f_options[j].variable = f_options[j].on_value;
4088 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4089 && ! strcmp (arg + 3, f_options[j].string))
4091 *f_options[j].variable = ! f_options[j].on_value;
4096 if (!strcmp (arg, "fast-math"))
4097 set_fast_math_flags (1);
4098 else if (!strcmp (arg, "no-fast-math"))
4099 set_fast_math_flags (0);
4100 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4101 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4104 read_integral_parameter (option_value, arg - 2,
4106 set_param_value ("max-inline-insns", val);
4107 set_param_value ("max-inline-insns-single", val/2);
4108 set_param_value ("max-inline-insns-auto", val/2);
4109 set_param_value ("max-inline-insns-rtl", val);
4110 if (val/4 < MIN_INLINE_INSNS)
4113 set_param_value ("min-inline-insns", val/4);
4115 set_param_value ("min-inline-insns", 10);
4118 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4120 if (strcmp (option_value, "global-dynamic") == 0)
4121 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4122 else if (strcmp (option_value, "local-dynamic") == 0)
4123 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4124 else if (strcmp (option_value, "initial-exec") == 0)
4125 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4126 else if (strcmp (option_value, "local-exec") == 0)
4127 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4129 warning ("`%s': unknown tls-model option", arg - 2);
4131 #ifdef INSN_SCHEDULING
4132 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4133 fix_sched_param ("verbose", option_value);
4135 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4136 fix_register (option_value, 1, 1);
4137 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4138 fix_register (option_value, 0, 1);
4139 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4140 fix_register (option_value, 0, 0);
4141 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4142 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4143 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4145 = read_integral_parameter (option_value, arg - 2, align_functions);
4146 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4147 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4148 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4150 = read_integral_parameter (option_value, arg - 2, align_labels);
4151 else if ((option_value
4152 = skip_leading_substring (arg, "stack-limit-register=")))
4154 int reg = decode_reg_name (option_value);
4156 error ("unrecognized register name `%s'", option_value);
4158 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4160 else if ((option_value
4161 = skip_leading_substring (arg, "stack-limit-symbol=")))
4164 nm = ggc_strdup (option_value);
4165 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4167 else if ((option_value
4168 = skip_leading_substring (arg, "message-length=")))
4169 output_set_maximum_length
4170 (&global_dc->buffer, read_integral_parameter
4171 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4172 else if ((option_value
4173 = skip_leading_substring (arg, "diagnostics-show-location=")))
4175 if (!strcmp (option_value, "once"))
4176 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4177 else if (!strcmp (option_value, "every-line"))
4178 diagnostic_prefixing_rule (global_dc)
4179 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4181 error ("unrecognized option `%s'", arg - 2);
4183 else if (!strcmp (arg, "no-stack-limit"))
4184 stack_limit_rtx = NULL_RTX;
4185 else if (!strcmp (arg, "preprocessed"))
4186 /* Recognize this switch but do nothing. This prevents warnings
4187 about an unrecognized switch if cpplib has not been linked in. */
4195 /* Parse a -W... command line switch. ARG is the value after the -W.
4196 It is safe to access 'ARG - 2' to generate the full switch name.
4197 Return the number of strings consumed. */
4200 decode_W_option (arg)
4203 const char *option_value = NULL;
4206 /* Search for the option in the table of binary W options. */
4208 for (j = ARRAY_SIZE (W_options); j--;)
4210 if (!strcmp (arg, W_options[j].string))
4212 *W_options[j].variable = W_options[j].on_value;
4216 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4217 && ! strcmp (arg + 3, W_options[j].string))
4219 *W_options[j].variable = ! W_options[j].on_value;
4224 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4225 warning ("-Wid-clash-LEN is no longer supported");
4226 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4228 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4230 warn_larger_than = larger_than_size != -1;
4232 else if (!strcmp (arg, "unused"))
4236 else if (!strcmp (arg, "no-unused"))
4240 else if (!strcmp (arg, "extra"))
4242 /* We save the value of warn_uninitialized, since if they put
4243 -Wuninitialized on the command line, we need to generate a
4244 warning about not using it without also specifying -O. */
4245 if (warn_uninitialized != 1)
4246 warn_uninitialized = 2;
4254 /* Parse a -g... command line switch. ARG is the value after the -g.
4255 It is safe to access 'ARG - 2' to generate the full switch name.
4256 Return the number of strings consumed. */
4259 decode_g_option (arg)
4262 static unsigned level = 0;
4263 /* A lot of code assumes write_symbols == NO_DEBUG if the
4264 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4265 of what debugging type has been selected). This records the
4266 selected type. It is an error to specify more than one
4268 static enum debug_info_type selected_debug_type = NO_DEBUG;
4269 /* Nonzero if debugging format has been explicitly set.
4270 -g and -ggdb don't explicitly set the debugging format so
4271 -gdwarf -g3 is equivalent to -gdwarf3. */
4272 static int type_explicitly_set_p = 0;
4273 /* Indexed by enum debug_info_type. */
4274 static const char *const debug_type_names[] =
4276 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4279 /* The maximum admissible debug level value. */
4280 static const unsigned max_debug_level = 3;
4282 /* Look up ARG in the table. */
4283 for (da = debug_args; da->arg; da++)
4285 const int da_len = strlen (da->arg);
4287 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4289 enum debug_info_type type = da->debug_type;
4290 const char *p = arg + da_len;
4292 if (*p && ! ISDIGIT (*p))
4295 /* A debug flag without a level defaults to level 2.
4296 Note we do not want to call read_integral_parameter
4297 for that case since it will call atoi which
4300 ??? We may want to generalize the interface to
4301 read_integral_parameter to better handle this case
4302 if this case shows up often. */
4304 level = read_integral_parameter (p, 0, max_debug_level + 1);
4306 level = (level == 0) ? 2 : level;
4308 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4310 error ("use -gdwarf -g%d for DWARF v1, level %d",
4313 error ("use -gdwarf-2 for DWARF v2");
4316 if (level > max_debug_level)
4319 ignoring option `%s' due to invalid debug level specification",
4321 level = debug_info_level;
4324 if (type == NO_DEBUG)
4326 type = PREFERRED_DEBUGGING_TYPE;
4328 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4330 #ifdef DWARF2_DEBUGGING_INFO
4331 type = DWARF2_DEBUG;
4333 #ifdef DBX_DEBUGGING_INFO
4340 if (type == NO_DEBUG)
4341 warning ("`%s': unknown or unsupported -g option", arg - 2);
4343 /* Does it conflict with an already selected type? */
4344 if (type_explicitly_set_p
4345 /* -g/-ggdb don't conflict with anything. */
4346 && da->debug_type != NO_DEBUG
4347 && type != selected_debug_type)
4348 warning ("`%s' ignored, conflicts with `-g%s'",
4349 arg - 2, debug_type_names[(int) selected_debug_type]);
4352 /* If the format has already been set, -g/-ggdb
4353 only change the debug level. */
4354 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4355 /* Don't change debugging type. */
4359 selected_debug_type = type;
4360 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4363 write_symbols = (level == 0
4365 : selected_debug_type);
4366 use_gnu_debug_info_extensions = da->use_extensions_p;
4367 debug_info_level = (enum debug_info_level) level;
4380 /* Decode the first argument in the argv as a language-independent option.
4381 Return the number of strings consumed. */
4384 independent_decode_option (argc, argv)
4388 char *arg = argv[0];
4390 if (arg[0] != '-' || arg[1] == 0)
4402 if (!strcmp (arg, "-help"))
4405 exit_after_options = 1;
4408 if (!strcmp (arg, "-target-help"))
4410 display_target_options ();
4411 exit_after_options = 1;
4414 if (!strcmp (arg, "-version"))
4416 print_version (stderr, "");
4417 exit_after_options = 1;
4420 /* Handle '--param <name>=<value>'. */
4421 if (strcmp (arg, "-param") == 0)
4427 error ("-param option missing argument");
4431 /* Get the '<name>=<value>' parameter. */
4433 /* Look for the `='. */
4434 equal = strchr (arg, '=');
4436 error ("invalid --param option: %s", arg);
4441 /* Zero out the `=' sign so that we get two separate strings. */
4443 /* Figure out what value is specified. */
4444 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4445 if (val != INVALID_PARAM_VAL)
4446 set_param_value (arg, val);
4448 error ("invalid parameter value `%s'", equal + 1);
4463 /* Already been treated in main (). Do nothing. */
4467 set_target_switch (arg + 1);
4471 return decode_f_option (arg + 1);
4474 return decode_g_option (arg + 1);
4477 if (!strcmp (arg, "dumpbase"))
4483 dump_base_name = argv[1];
4488 decode_d_option (arg + 1);
4492 if (!strcmp (arg, "pedantic"))
4494 else if (!strcmp (arg, "pedantic-errors"))
4495 flag_pedantic_errors = pedantic = 1;
4496 else if (arg[1] == 0)
4503 if (!strcmp (arg, "quiet"))
4510 if (!strcmp (arg, "version"))
4518 inhibit_warnings = 1;
4527 /* We save the value of warn_uninitialized, since if they put
4528 -Wuninitialized on the command line, we need to generate a
4529 warning about not using it without also specifying -O. */
4530 if (warn_uninitialized != 1)
4531 warn_uninitialized = 2;
4534 return decode_W_option (arg + 1);
4538 if (!strncmp (arg, "aux-info", 8))
4545 aux_info_file_name = argv[1];
4546 flag_gen_aux_info = 1;
4549 else if (arg[8] == '=')
4551 aux_info_file_name = arg + 9;
4552 flag_gen_aux_info = 1;
4557 else if (!strcmp (arg, "auxbase"))
4563 aux_base_name = argv[1];
4567 else if (!strcmp (arg, "auxbase-strip"))
4574 strip_off_ending (argv[1], strlen (argv[1]));
4576 aux_base_name = argv[1];
4591 asm_file_name = argv[1];
4606 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4611 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4615 if (g_switch_val == -1)
4619 g_switch_set = TRUE;
4620 g_switch_value = g_switch_val;
4630 /* Decode -m switches. */
4631 /* Decode the switch -mNAME. */
4634 set_target_switch (name)
4638 int valid_target_option = 0;
4640 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4641 if (!strcmp (target_switches[j].name, name))
4643 if (target_switches[j].value < 0)
4644 target_flags &= ~-target_switches[j].value;
4646 target_flags |= target_switches[j].value;
4649 if (target_switches[j].value < 0)
4650 target_flags_explicit |= -target_switches[j].value;
4652 target_flags_explicit |= target_switches[j].value;
4654 valid_target_option = 1;
4657 #ifdef TARGET_OPTIONS
4658 if (!valid_target_option)
4659 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4661 int len = strlen (target_options[j].prefix);
4662 if (!strncmp (target_options[j].prefix, name, len))
4664 *target_options[j].variable = name + len;
4665 valid_target_option = 1;
4670 if (!valid_target_option)
4671 error ("invalid option `%s'", name);
4674 /* Print version information to FILE.
4675 Each line begins with INDENT (for the case where FILE is the
4676 assembler output file). */
4679 print_version (file, indent)
4684 #define __VERSION__ "[?]"
4688 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4690 "%s%s%s version %s (%s) compiled by CC.\n"
4692 , indent, *indent != 0 ? " " : "",
4693 lang_hooks.name, version_string, TARGET_NAME,
4694 indent, __VERSION__);
4695 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4696 indent, *indent != 0 ? " " : "",
4697 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4700 /* Print an option value and return the adjusted position in the line.
4701 ??? We don't handle error returns from fprintf (disk full); presumably
4702 other code will catch a disk full though. */
4705 print_single_switch (file, pos, max, indent, sep, term, type, name)
4708 const char *indent, *sep, *term, *type, *name;
4710 /* The ultrix fprintf returns 0 on success, so compute the result we want
4711 here since we need it for the following test. */
4712 int len = strlen (sep) + strlen (type) + strlen (name);
4717 fprintf (file, "%s", term);
4722 fprintf (file, "%s", indent);
4723 pos = strlen (indent);
4725 fprintf (file, "%s%s%s", sep, type, name);
4730 /* Print active target switches to FILE.
4731 POS is the current cursor position and MAX is the size of a "line".
4732 Each line begins with INDENT and ends with TERM.
4733 Each switch is separated from the next by SEP. */
4736 print_switch_values (file, pos, max, indent, sep, term)
4739 const char *indent, *sep, *term;
4744 /* Print the options as passed. */
4746 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4747 _("options passed: "), "");
4749 for (p = &save_argv[1]; *p != NULL; p++)
4753 if (strcmp (*p, "-o") == 0)
4759 if (strcmp (*p, "-quiet") == 0)
4761 if (strcmp (*p, "-version") == 0)
4766 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4769 fprintf (file, "%s", term);
4771 /* Print the -f and -m options that have been enabled.
4772 We don't handle language specific options but printing argv
4775 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4776 _("options enabled: "), "");
4778 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4779 if (*f_options[j].variable == f_options[j].on_value)
4780 pos = print_single_switch (file, pos, max, indent, sep, term,
4781 "-f", f_options[j].string);
4783 /* Print target specific options. */
4785 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4786 if (target_switches[j].name[0] != '\0'
4787 && target_switches[j].value > 0
4788 && ((target_switches[j].value & target_flags)
4789 == target_switches[j].value))
4791 pos = print_single_switch (file, pos, max, indent, sep, term,
4792 "-m", target_switches[j].name);
4795 #ifdef TARGET_OPTIONS
4796 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4797 if (*target_options[j].variable != NULL)
4800 sprintf (prefix, "-m%s", target_options[j].prefix);
4801 pos = print_single_switch (file, pos, max, indent, sep, term,
4802 prefix, *target_options[j].variable);
4806 fprintf (file, "%s", term);
4809 /* Open assembly code output file. Do this even if -fsyntax-only is
4810 on, because then the driver will have provided the name of a
4811 temporary file or bit bucket for us. NAME is the file specified on
4812 the command line, possibly NULL. */
4814 init_asm_output (name)
4817 if (name == NULL && asm_file_name == 0)
4818 asm_out_file = stdout;
4821 if (asm_file_name == 0)
4823 int len = strlen (dump_base_name);
4824 char *dumpname = (char *) xmalloc (len + 6);
4825 memcpy (dumpname, dump_base_name, len + 1);
4826 strip_off_ending (dumpname, len);
4827 strcat (dumpname, ".s");
4828 asm_file_name = dumpname;
4830 if (!strcmp (asm_file_name, "-"))
4831 asm_out_file = stdout;
4833 asm_out_file = fopen (asm_file_name, "w+");
4834 if (asm_out_file == 0)
4835 fatal_io_error ("can't open %s for writing", asm_file_name);
4838 #ifdef IO_BUFFER_SIZE
4839 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4840 _IOFBF, IO_BUFFER_SIZE);
4843 if (!flag_syntax_only)
4845 #ifdef ASM_FILE_START
4846 ASM_FILE_START (asm_out_file);
4849 #ifdef ASM_COMMENT_START
4850 if (flag_verbose_asm)
4852 /* Print the list of options in effect. */
4853 print_version (asm_out_file, ASM_COMMENT_START);
4854 print_switch_values (asm_out_file, 0, MAX_LINE,
4855 ASM_COMMENT_START, " ", "\n");
4856 /* Add a blank line here so it appears in assembler output but not
4858 fprintf (asm_out_file, "\n");
4864 /* Initialization of the front end environment, before command line
4865 options are parsed. Signal handlers, internationalization etc.
4866 ARGV0 is main's argv[0]. */
4868 general_init (argv0)
4873 p = argv0 + strlen (argv0);
4874 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4878 xmalloc_set_program_name (progname);
4882 gcc_init_libintl ();
4884 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4886 signal (SIGSEGV, crash_signal);
4889 signal (SIGILL, crash_signal);
4892 signal (SIGBUS, crash_signal);
4895 signal (SIGABRT, crash_signal);
4897 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4898 signal (SIGIOT, crash_signal);
4901 signal (SIGFPE, crash_signal);
4904 /* Other host-specific signal setup. */
4905 (*host_hooks.extra_signals)();
4907 /* Initialize the diagnostics reporting machinery, so option parsing
4908 can give warnings and errors. */
4909 diagnostic_initialize (global_dc);
4911 /* Initialize the garbage-collector, string pools and tree type hash
4918 /* Parse command line options and set default flag values, called
4919 after language-independent option-independent initialization. Do
4920 minimal options processing. Outputting diagnostics is OK, but GC
4921 and identifier hashtables etc. are not initialized yet.
4923 Return nonzero to suppress compiler back end initialization. */
4925 parse_options_and_default_flags (argc, argv)
4931 /* Save in case md file wants to emit args as a comment. */
4935 /* Initialize register usage now so switches may override. */
4938 /* Register the language-independent parameters. */
4939 add_params (lang_independent_params, LAST_PARAM);
4941 /* This must be done after add_params but before argument processing. */
4942 init_ggc_heuristics();
4944 /* Perform language-specific options initialization. */
4945 (*lang_hooks.init_options) ();
4947 /* Scan to see what optimization level has been specified. That will
4948 determine the default value of many flags. */
4949 for (i = 1; i < argc; i++)
4951 if (!strcmp (argv[i], "-O"))
4956 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4958 /* Handle -Os, -O2, -O3, -O69, ... */
4959 char *p = &argv[i][2];
4961 if ((p[0] == 's') && (p[1] == 0))
4965 /* Optimizing for size forces optimize to be 2. */
4970 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4971 if (optimize_val != -1)
4973 optimize = optimize_val;
4982 flag_merge_constants = 0;
4988 flag_thread_jumps = 1;
4990 flag_delayed_branch = 1;
4992 #ifdef CAN_DEBUG_WITHOUT_FP
4993 flag_omit_frame_pointer = 1;
4995 flag_guess_branch_prob = 1;
4996 flag_cprop_registers = 1;
4997 flag_loop_optimize = 1;
4998 flag_crossjumping = 1;
4999 flag_if_conversion = 1;
5000 flag_if_conversion2 = 1;
5005 flag_optimize_sibling_calls = 1;
5006 flag_cse_follow_jumps = 1;
5007 flag_cse_skip_blocks = 1;
5009 flag_expensive_optimizations = 1;
5010 flag_strength_reduce = 1;
5011 flag_rerun_cse_after_loop = 1;
5012 flag_rerun_loop_opt = 1;
5013 flag_caller_saves = 1;
5016 #ifdef INSN_SCHEDULING
5017 flag_schedule_insns = 1;
5018 flag_schedule_insns_after_reload = 1;
5021 flag_strict_aliasing = 1;
5022 flag_delete_null_pointer_checks = 1;
5023 flag_reorder_blocks = 1;
5024 flag_reorder_functions = 1;
5029 flag_inline_functions = 1;
5030 flag_rename_registers = 1;
5031 flag_unswitch_loops = 1;
5032 flag_unit_at_a_time = 1;
5035 if (optimize < 2 || optimize_size)
5040 align_functions = 1;
5042 /* Don't reorder blocks when optimizing for size because extra
5043 jump insns may be created; also barrier may create extra padding.
5045 More correctly we should have a block reordering mode that tried
5046 to minimize the combined size of all the jumps. This would more
5047 or less automatically remove extra jumps, but would also try to
5048 use more short jumps instead of long jumps. */
5049 flag_reorder_blocks = 0;
5052 /* Initialize whether `char' is signed. */
5053 flag_signed_char = DEFAULT_SIGNED_CHAR;
5054 #ifdef DEFAULT_SHORT_ENUMS
5055 /* Initialize how much space enums occupy, by default. */
5056 flag_short_enums = DEFAULT_SHORT_ENUMS;
5059 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5062 set_target_switch ("");
5064 /* Unwind tables are always present in an ABI-conformant IA-64
5065 object file, so the default should be ON. */
5066 #ifdef IA64_UNWIND_INFO
5067 flag_unwind_tables = IA64_UNWIND_INFO;
5070 #ifdef OPTIMIZATION_OPTIONS
5071 /* Allow default optimizations to be specified on a per-machine basis. */
5072 OPTIMIZATION_OPTIONS (optimize, optimize_size);
5075 /* Perform normal command line switch decoding. */
5076 for (i = 1; i < argc;)
5079 int indep_processed;
5081 /* Give the language a chance to decode the option for itself. */
5082 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
5084 if (lang_processed >= 0)
5085 /* Now see if the option also has a language independent meaning.
5086 Some options are both language specific and language independent,
5088 indep_processed = independent_decode_option (argc - i, argv + i);
5091 lang_processed = -lang_processed;
5092 indep_processed = 0;
5095 if (lang_processed || indep_processed)
5096 i += MAX (lang_processed, indep_processed);
5099 const char *option = NULL;
5100 const char *lang = NULL;
5103 /* It is possible that the command line switch is not valid for the
5104 current language, but it is valid for another language. In order
5105 to be compatible with previous versions of the compiler (which
5106 did not issue an error message in this case) we check for this
5107 possibility here. If we do find a match, then if extra_warnings
5108 is set we generate a warning message, otherwise we will just
5109 ignore the option. */
5110 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5112 option = documented_lang_options[j].option;
5115 lang = documented_lang_options[j].description;
5116 else if (! strncmp (argv[i], option, strlen (option)))
5120 if (j != ARRAY_SIZE (documented_lang_options))
5124 warning ("ignoring command line option '%s'", argv[i]);
5127 ("(it is valid for %s but not the selected language)",
5131 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5132 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5134 error ("unrecognized option `%s'", argv[i]);
5140 if (flag_no_inline == 2)
5143 flag_really_no_inline = flag_no_inline;
5145 /* Set flag_no_inline before the post_options () hook. The C front
5146 ends use it to determine tree inlining defaults. FIXME: such
5147 code should be lang-independent when all front ends use tree
5148 inlining, in which case it, and this condition, should be moved
5149 to the top of process_options() instead. */
5152 /* Inlining does not work if not optimizing,
5153 so force it not to be done. */
5157 /* The c_decode_option function and decode_option hook set
5158 this to `2' if -Wall is used, so we can avoid giving out
5159 lots of errors for people who don't realize what -Wall does. */
5160 if (warn_uninitialized == 1)
5161 warning ("-Wuninitialized is not supported without -O");
5164 if (flag_really_no_inline == 2)
5165 flag_really_no_inline = flag_no_inline;
5168 /* Process the options that have been parsed. */
5172 #ifdef OVERRIDE_OPTIONS
5173 /* Some machines may reject certain combinations of options. */
5177 /* Set aux_base_name if not already set. */
5182 char *name = xstrdup (lbasename (filename));
5184 strip_off_ending (name, strlen (name));
5185 aux_base_name = name;
5188 aux_base_name = "gccaux";
5190 /* Set up the align_*_log variables, defaulting them to 1 if they
5191 were still unset. */
5192 if (align_loops <= 0) align_loops = 1;
5193 if (align_loops_max_skip > align_loops || !align_loops)
5194 align_loops_max_skip = align_loops - 1;
5195 align_loops_log = floor_log2 (align_loops * 2 - 1);
5196 if (align_jumps <= 0) align_jumps = 1;
5197 if (align_jumps_max_skip > align_jumps || !align_jumps)
5198 align_jumps_max_skip = align_jumps - 1;
5199 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5200 if (align_labels <= 0) align_labels = 1;
5201 align_labels_log = floor_log2 (align_labels * 2 - 1);
5202 if (align_labels_max_skip > align_labels || !align_labels)
5203 align_labels_max_skip = align_labels - 1;
5204 if (align_functions <= 0) align_functions = 1;
5205 align_functions_log = floor_log2 (align_functions * 2 - 1);
5207 /* Unrolling all loops implies that standard loop unrolling must also
5209 if (flag_unroll_all_loops)
5210 flag_unroll_loops = 1;
5212 if (flag_unroll_loops)
5214 flag_old_unroll_loops = 0;
5215 flag_old_unroll_all_loops = 0;
5218 if (flag_old_unroll_all_loops)
5219 flag_old_unroll_loops = 1;
5221 /* Old loop unrolling requires that strength_reduction be on also. Silently
5222 turn on strength reduction here if it isn't already on. Also, the loop
5223 unrolling code assumes that cse will be run after loop, so that must
5224 be turned on also. */
5225 if (flag_old_unroll_loops)
5227 flag_strength_reduce = 1;
5228 flag_rerun_cse_after_loop = 1;
5230 if (flag_unroll_loops || flag_peel_loops)
5231 flag_rerun_cse_after_loop = 1;
5233 if (flag_non_call_exceptions)
5234 flag_asynchronous_unwind_tables = 1;
5235 if (flag_asynchronous_unwind_tables)
5236 flag_unwind_tables = 1;
5238 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5240 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
5241 flag_unit_at_a_time = 0;
5243 /* Warn about options that are not supported on this machine. */
5244 #ifndef INSN_SCHEDULING
5245 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5246 warning ("instruction scheduling not supported on this target machine");
5249 if (flag_delayed_branch)
5250 warning ("this target machine does not have delayed branches");
5253 user_label_prefix = USER_LABEL_PREFIX;
5254 if (flag_leading_underscore != -1)
5256 /* If the default prefix is more complicated than "" or "_",
5257 issue a warning and ignore this option. */
5258 if (user_label_prefix[0] == 0 ||
5259 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5261 user_label_prefix = flag_leading_underscore ? "_" : "";
5264 warning ("-f%sleading-underscore not supported on this target machine",
5265 flag_leading_underscore ? "" : "no-");
5268 /* If we are in verbose mode, write out the version and maybe all the
5269 option flags in use. */
5272 print_version (stderr, "");
5274 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5277 if (! quiet_flag || flag_detailed_statistics)
5280 if (flag_syntax_only)
5282 write_symbols = NO_DEBUG;
5286 /* Now we know write_symbols, set up the debug hooks based on it.
5287 By default we do nothing for debug output. */
5288 #if defined(DBX_DEBUGGING_INFO)
5289 if (write_symbols == DBX_DEBUG)
5290 debug_hooks = &dbx_debug_hooks;
5292 #if defined(XCOFF_DEBUGGING_INFO)
5293 if (write_symbols == XCOFF_DEBUG)
5294 debug_hooks = &xcoff_debug_hooks;
5296 #ifdef SDB_DEBUGGING_INFO
5297 if (write_symbols == SDB_DEBUG)
5298 debug_hooks = &sdb_debug_hooks;
5300 #ifdef DWARF_DEBUGGING_INFO
5301 if (write_symbols == DWARF_DEBUG)
5302 debug_hooks = &dwarf_debug_hooks;
5304 #ifdef DWARF2_DEBUGGING_INFO
5305 if (write_symbols == DWARF2_DEBUG)
5306 debug_hooks = &dwarf2_debug_hooks;
5308 #ifdef VMS_DEBUGGING_INFO
5309 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5310 debug_hooks = &vmsdbg_debug_hooks;
5313 /* If auxiliary info generation is desired, open the output file.
5314 This goes in the same directory as the source file--unlike
5315 all the other output files. */
5316 if (flag_gen_aux_info)
5318 aux_info_file = fopen (aux_info_file_name, "w");
5319 if (aux_info_file == 0)
5320 fatal_io_error ("can't open %s", aux_info_file_name);
5323 if (! targetm.have_named_sections)
5325 if (flag_function_sections)
5327 warning ("-ffunction-sections not supported for this target");
5328 flag_function_sections = 0;
5330 if (flag_data_sections)
5332 warning ("-fdata-sections not supported for this target");
5333 flag_data_sections = 0;
5337 if (flag_function_sections && profile_flag)
5339 warning ("-ffunction-sections disabled; it makes profiling impossible");
5340 flag_function_sections = 0;
5343 #ifndef HAVE_prefetch
5344 if (flag_prefetch_loop_arrays)
5346 warning ("-fprefetch-loop-arrays not supported for this target");
5347 flag_prefetch_loop_arrays = 0;
5350 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5352 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5353 flag_prefetch_loop_arrays = 0;
5357 /* This combination of options isn't handled for i386 targets and doesn't
5358 make much sense anyway, so don't allow it. */
5359 if (flag_prefetch_loop_arrays && optimize_size)
5361 warning ("-fprefetch-loop-arrays is not supported with -Os");
5362 flag_prefetch_loop_arrays = 0;
5365 #ifndef OBJECT_FORMAT_ELF
5366 if (flag_function_sections && write_symbols != NO_DEBUG)
5367 warning ("-ffunction-sections may affect debugging on some targets");
5370 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5371 if (flag_signaling_nans)
5372 flag_trapping_math = 1;
5375 /* Initialize the compiler back end. */
5379 /* init_emit_once uses reg_raw_mode and therefore must be called
5380 after init_regs which initialized reg_raw_mode. */
5382 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5383 || debug_info_level == DINFO_LEVEL_VERBOSE
5384 #ifdef VMS_DEBUGGING_INFO
5385 /* Enable line number info for traceback */
5386 || debug_info_level > DINFO_LEVEL_NONE
5388 || flag_test_coverage
5389 || warn_notreached);
5390 init_fake_stack_mems ();
5394 init_function_once ();
5395 init_varasm_once ();
5397 /* The following initialization functions need to generate rtl, so
5398 provide a dummy function context for them. */
5399 init_dummy_function_start ();
5401 if (flag_caller_saves)
5402 init_caller_save ();
5403 expand_dummy_function_end ();
5406 /* Language-dependent initialization. Returns nonzero on success. */
5408 lang_dependent_init (name)
5411 if (dump_base_name == 0)
5412 dump_base_name = name ? name : "gccdump";
5414 /* Front-end initialization. This hook can assume that GC,
5415 identifier hashes etc. are set up, but debug initialization is
5416 not done yet. This routine must return the original filename
5417 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5418 name = (*lang_hooks.init) (name);
5422 main_input_filename = input_filename = name;
5423 init_asm_output (name);
5425 /* These create various _DECL nodes, so need to be called after the
5426 front end is initialized. */
5430 /* The following initialization functions need to generate rtl, so
5431 provide a dummy function context for them. */
5432 init_dummy_function_start ();
5434 expand_dummy_function_end ();
5436 /* Put an entry on the input file stack for the main input file. */
5437 push_srcloc (input_filename, 0);
5439 /* If dbx symbol table desired, initialize writing it and output the
5440 predefined types. */
5441 timevar_push (TV_SYMOUT);
5443 #ifdef DWARF2_UNWIND_INFO
5444 if (dwarf2out_do_frame ())
5445 dwarf2out_frame_init ();
5448 /* Now we have the correct original filename, we can initialize
5450 (*debug_hooks->init) (name);
5452 timevar_pop (TV_SYMOUT);
5457 /* Clean up: close opened files, etc. */
5462 /* Close the dump files. */
5463 if (flag_gen_aux_info)
5465 fclose (aux_info_file);
5467 unlink (aux_info_file_name);
5470 /* Close non-debugging input and output files. Take special care to note
5471 whether fclose returns an error, since the pages might still be on the
5472 buffer chain while the file is open. */
5476 if (ferror (asm_out_file) != 0)
5477 fatal_io_error ("error writing to %s", asm_file_name);
5478 if (fclose (asm_out_file) != 0)
5479 fatal_io_error ("error closing %s", asm_file_name);
5482 /* Do whatever is necessary to finish printing the graphs. */
5483 if (graph_dump_format != no_graph)
5487 for (i = 0; i < (int) DFI_MAX; ++i)
5488 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5493 sprintf (seq, DUMPFILE_FORMAT, i);
5494 suffix = concat (seq, dump_file[i].extension, NULL);
5495 finish_graph_dump_file (dump_base_name, suffix);
5502 ggc_print_statistics ();
5503 stringpool_statistics ();
5504 dump_tree_statistics ();
5507 /* Free up memory for the benefit of leak detectors. */
5510 /* Language-specific end of compilation actions. */
5511 (*lang_hooks.finish) ();
5514 /* Initialize the compiler, and compile the input file. */
5516 do_compile (no_backend)
5519 /* We cannot start timing until after options are processed since that
5520 says if we run timers or not. */
5522 timevar_start (TV_TOTAL);
5524 /* Set up the back-end if requested. */
5528 /* Language-dependent initialization. Returns true on success. */
5529 if (lang_dependent_init (filename))
5534 /* Stop timing and print the times. */
5535 timevar_stop (TV_TOTAL);
5536 timevar_print (stderr);
5539 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5540 Decode command args, then call compile_file.
5541 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5542 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5544 It is not safe to call this function more than once. */
5547 toplev_main (argc, argv)
5551 /* Initialization of GCC's environment, and diagnostics. */
5552 general_init (argv[0]);
5554 /* Parse the options and do minimal processing; basically just
5555 enough to default flags appropriately. */
5556 parse_options_and_default_flags (argc, argv);
5558 /* Exit early if we can (e.g. -help). */
5559 if (!exit_after_options)
5561 /* All command line options have been parsed; allow the front
5562 end to perform consistency checks, etc. */
5563 bool no_backend = (*lang_hooks.post_options) ();
5565 /* The bulk of command line switch processing. */
5568 /* Don't do any more if an error has already occurred. */
5570 do_compile (no_backend);
5573 if (errorcount || sorrycount)
5574 return (FATAL_EXIT_CODE);
5576 return (SUCCESS_EXIT_CODE);