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 ((void));
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 /* True if we don't need a backend (e.g. preprocessing only). */
139 static bool no_backend;
141 /* Length of line when printing switch values. */
144 /* Name of program invoked, sans directories. */
146 const char *progname;
148 /* Copy of arguments to toplev_main. */
152 /* Name of current original source file (what was input to cpp).
153 This comes from each #-command in the actual input. */
155 const char *input_filename;
157 /* Name of top-level original source file (what was input to cpp).
158 This comes from the #-command at the beginning of the actual input.
159 If there isn't any there, then this is the cc1 input file name. */
161 const char *main_input_filename;
163 /* Current line number in real source file. */
167 /* Nonzero if it is unsafe to create any new pseudo registers. */
170 /* Stack of currently pending input files. */
172 struct file_stack *input_file_stack;
174 /* Incremented on each change to input_file_stack. */
175 int input_file_stack_tick;
177 /* Name to use as base of names for dump output files. */
179 const char *dump_base_name;
181 /* Name to use as a base for auxiliary output files. */
183 static const char *aux_base_name;
185 /* Format to use to print dumpfile index value */
186 #ifndef DUMPFILE_FORMAT
187 #define DUMPFILE_FORMAT ".%02d."
190 /* Bit flags that specify the machine subtype we are compiling for.
191 Bits are tested using macros TARGET_... defined in the tm.h file
192 and set by `-m...' switches. Must be defined in rtlanal.c. */
194 extern int target_flags;
196 /* A mask of target_flags that includes bit X if X was set or cleared
197 on the command line. */
199 int target_flags_explicit;
201 /* Debug hooks - dependent upon command line options. */
203 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
205 /* Describes a dump file. */
207 struct dump_file_info
209 /* The unique extension to apply, e.g. ".jump". */
210 const char *const extension;
212 /* The -d<c> character that enables this dump file. */
213 char const debug_switch;
215 /* True if there is a corresponding graph dump file. */
216 char const graph_dump_p;
218 /* True if the user selected this dump. */
221 /* True if the files have been initialized (ie truncated). */
225 /* Enumerate the extant dump files. */
269 /* Describes all the dump files. Should be kept in order of the
270 pass and in sync with dump_file_index above.
272 Remaining -d letters:
278 static struct dump_file_info dump_file[DFI_MAX] =
280 { "rtl", 'r', 0, 0, 0 },
281 { "sibling", 'i', 0, 0, 0 },
282 { "eh", 'h', 0, 0, 0 },
283 { "jump", 'j', 0, 0, 0 },
284 { "ssa", 'e', 1, 0, 0 },
285 { "ssaccp", 'W', 1, 0, 0 },
286 { "ssadce", 'X', 1, 0, 0 },
287 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
288 { "null", 'u', 0, 0, 0 },
289 { "cse", 's', 0, 0, 0 },
290 { "addressof", 'F', 0, 0, 0 },
291 { "gcse", 'G', 1, 0, 0 },
292 { "loop", 'L', 1, 0, 0 },
293 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
294 { "cfg", 'f', 1, 0, 0 },
295 { "bp", 'b', 1, 0, 0 },
296 { "ce1", 'C', 1, 0, 0 },
297 { "tracer", 'T', 1, 0, 0 },
298 { "loop2", 'L', 1, 0, 0 },
299 { "cse2", 't', 1, 0, 0 },
300 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
301 { "combine", 'c', 1, 0, 0 },
302 { "ce2", 'C', 1, 0, 0 },
303 { "regmove", 'N', 1, 0, 0 },
304 { "sched", 'S', 1, 0, 0 },
305 { "lreg", 'l', 1, 0, 0 },
306 { "greg", 'g', 1, 0, 0 },
307 { "postreload", 'o', 1, 0, 0 },
308 { "flow2", 'w', 1, 0, 0 },
309 { "peephole2", 'z', 1, 0, 0 },
310 { "rnreg", 'n', 1, 0, 0 },
311 { "ce3", 'E', 1, 0, 0 },
312 { "bbro", 'B', 1, 0, 0 },
313 { "sched2", 'R', 1, 0, 0 },
314 { "stack", 'k', 1, 0, 0 },
315 { "mach", 'M', 1, 0, 0 },
316 { "dbr", 'd', 0, 0, 0 },
319 static int open_dump_file PARAMS ((enum dump_file_index, tree));
320 static void close_dump_file PARAMS ((enum dump_file_index,
321 void (*) (FILE *, rtx), rtx));
323 /* Other flags saying which kinds of debugging dump have been requested. */
325 int rtl_dump_and_exit;
326 int flag_print_asm_name;
327 static int version_flag;
328 static const char *filename;
329 enum graph_dump_types graph_dump_format;
331 /* Name for output file of assembly code, specified with -o. */
335 /* Value of the -G xx switch, and whether it was passed or not. */
339 /* Type(s) of debugging information we are producing (if any).
340 See flags.h for the definitions of the different possible
341 types of debugging information. */
342 enum debug_info_type write_symbols = NO_DEBUG;
344 /* Level of debugging information we are producing. See flags.h
345 for the definitions of the different possible levels. */
346 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
348 /* Nonzero means use GNU-only extensions in the generated symbolic
349 debugging information. */
350 /* Currently, this only has an effect when write_symbols is set to
351 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
352 int use_gnu_debug_info_extensions = 0;
354 /* Nonzero means do optimizations. -O.
355 Particular numeric values stand for particular amounts of optimization;
356 thus, -O2 stores 2 here. However, the optimizations beyond the basic
357 ones are not controlled directly by this variable. Instead, they are
358 controlled by individual `flag_...' variables that are defaulted
359 based on this variable. */
363 /* Nonzero means optimize for size. -Os.
364 The only valid values are zero and nonzero. When optimize_size is
365 nonzero, optimize defaults to 2, but certain individual code
366 bloating optimizations are disabled. */
368 int optimize_size = 0;
370 /* Nonzero if we should exit after parsing options. */
371 static int exit_after_options = 0;
373 /* The FUNCTION_DECL for the function currently being compiled,
374 or 0 if between functions. */
375 tree current_function_decl;
377 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
379 tree current_function_func_begin_label;
381 /* Nonzero if doing dwarf2 duplicate elimination. */
383 int flag_eliminate_dwarf2_dups = 0;
385 /* Nonzero if doing unused type elimination. */
387 int flag_eliminate_unused_debug_types = 1;
389 /* Nonzero if generating code to do profiling. */
391 int profile_flag = 0;
393 /* Nonzero if generating code to profile program flow graph arcs. */
395 int profile_arc_flag = 0;
397 /* Nonzero if generating info for gcov to calculate line test coverage. */
399 int flag_test_coverage = 0;
401 /* Nonzero indicates that branch taken probabilities should be calculated. */
403 int flag_branch_probabilities = 0;
405 /* Nonzero if basic blocks should be reordered. */
407 int flag_reorder_blocks = 0;
409 /* Nonzero if functions should be reordered. */
411 int flag_reorder_functions = 0;
413 /* Nonzero if registers should be renamed. */
415 int flag_rename_registers = 0;
416 int flag_cprop_registers = 0;
418 /* Nonzero for -pedantic switch: warn about anything
419 that standard spec forbids. */
423 /* Temporarily suppress certain warnings.
424 This is set while reading code from a system header file. */
426 int in_system_header = 0;
428 /* Don't print functions as they are compiled. -quiet. */
432 /* Print times taken by the various passes. -ftime-report. */
436 /* Print memory still in use at end of compilation (which may have little
437 to do with peak memory consumption). -fmem-report. */
441 /* Nonzero means to collect statistics which might be expensive
442 and to print them when we are done. */
443 int flag_detailed_statistics = 0;
448 /* Nonzero means `char' should be signed. */
450 int flag_signed_char;
452 /* Nonzero means give an enum type only as many bytes as it needs. */
454 int flag_short_enums;
456 /* Nonzero for -fcaller-saves: allocate values in regs that need to
457 be saved across function calls, if that produces overall better code.
458 Optional now, so people can test it. */
460 #ifdef DEFAULT_CALLER_SAVES
461 int flag_caller_saves = 1;
463 int flag_caller_saves = 0;
466 /* Nonzero if structures and unions should be returned in memory.
468 This should only be defined if compatibility with another compiler or
469 with an ABI is needed, because it results in slower code. */
471 #ifndef DEFAULT_PCC_STRUCT_RETURN
472 #define DEFAULT_PCC_STRUCT_RETURN 1
475 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
477 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
479 /* Nonzero for -fforce-mem: load memory value into a register
480 before arithmetic on it. This makes better cse but slower compilation. */
482 int flag_force_mem = 0;
484 /* Nonzero for -fforce-addr: load memory address into a register before
485 reference to memory. This makes better cse but slower compilation. */
487 int flag_force_addr = 0;
489 /* Nonzero for -fdefer-pop: don't pop args after each function call;
490 instead save them up to pop many calls' args with one insns. */
492 int flag_defer_pop = 0;
494 /* Nonzero for -ffloat-store: don't allocate floats and doubles
495 in extended-precision registers. */
497 int flag_float_store = 0;
499 /* Nonzero for -fcse-follow-jumps:
500 have cse follow jumps to do a more extensive job. */
502 int flag_cse_follow_jumps;
504 /* Nonzero for -fcse-skip-blocks:
505 have cse follow a branch around a block. */
506 int flag_cse_skip_blocks;
508 /* Nonzero for -fexpensive-optimizations:
509 perform miscellaneous relatively-expensive optimizations. */
510 int flag_expensive_optimizations;
512 /* Nonzero for -fthread-jumps:
513 have jump optimize output of loop. */
515 int flag_thread_jumps;
517 /* Nonzero enables strength-reduction in loop.c. */
519 int flag_strength_reduce = 0;
521 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
522 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
523 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
526 int flag_old_unroll_loops;
528 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
529 This is generally not a win. */
531 int flag_old_unroll_all_loops;
533 /* Enables unrolling of simple loops in loop-unroll.c. */
534 int flag_unroll_loops;
536 /* Enables unrolling of all loops in loop-unroll.c. */
537 int flag_unroll_all_loops;
539 /* Nonzero enables loop peeling. */
542 /* Nonzero enables loop unswitching. */
543 int flag_unswitch_loops;
545 /* Nonzero enables prefetch optimizations for arrays in loops. */
547 int flag_prefetch_loop_arrays;
549 /* Nonzero forces all invariant computations in loops to be moved
552 int flag_move_all_movables = 0;
554 /* Nonzero forces all general induction variables in loops to be
557 int flag_reduce_all_givs = 0;
559 /* Nonzero to perform full register move optimization passes. This is the
562 int flag_regmove = 0;
564 /* Nonzero for -fwritable-strings:
565 store string constants in data segment and don't uniquize them. */
567 int flag_writable_strings = 0;
569 /* Nonzero means don't put addresses of constant functions in registers.
570 Used for compiling the Unix kernel, where strange substitutions are
571 done on the assembly output. */
573 int flag_no_function_cse = 0;
575 /* Nonzero for -fomit-frame-pointer:
576 don't make a frame pointer in simple functions that don't require one. */
578 int flag_omit_frame_pointer = 0;
580 /* Nonzero means place each function into its own section on those platforms
581 which support arbitrary section names and unlimited numbers of sections. */
583 int flag_function_sections = 0;
585 /* ... and similar for data. */
587 int flag_data_sections = 0;
589 /* Nonzero to inhibit use of define_optimization peephole opts. */
591 int flag_no_peephole = 0;
593 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
595 int flag_optimize_sibling_calls = 0;
597 /* Nonzero means the front end generally wants `errno' maintained by math
598 operations, like built-in SQRT. */
600 int flag_errno_math = 1;
602 /* Nonzero means that unsafe floating-point math optimizations are allowed
603 for the sake of speed. IEEE compliance is not guaranteed, and operations
604 are allowed to assume that their arguments and results are "normal"
605 (e.g., nonnegative for SQRT). */
607 int flag_unsafe_math_optimizations = 0;
609 /* Nonzero means that no NaNs or +-Infs are expected. */
611 int flag_finite_math_only = 0;
613 /* Zero means that floating-point math operations cannot generate a
614 (user-visible) trap. This is the case, for example, in nonstop
615 IEEE 754 arithmetic. Trapping conditions include division by zero,
616 overflow, underflow, invalid and inexact, but does not include
617 operations on signaling NaNs (see below). */
619 int flag_trapping_math = 1;
621 /* Nonzero means disable transformations observable by signaling NaNs.
622 This option implies that any operation on a IEEE signaling NaN can
623 generate a (user-visible) trap. */
625 int flag_signaling_nans = 0;
627 /* 0 means straightforward implementation of complex divide acceptable.
628 1 means wide ranges of inputs must work for complex divide.
629 2 means C99-like requirements for complex divide (not yet implemented). */
631 int flag_complex_divide_method = 0;
633 /* Nonzero means just do syntax checking; don't output anything. */
635 int flag_syntax_only = 0;
637 /* Nonzero means perform loop optimizer. */
639 static int flag_loop_optimize;
641 /* Nonzero means perform crossjumping. */
643 static int flag_crossjumping;
645 /* Nonzero means perform if conversion. */
647 static int flag_if_conversion;
649 /* Nonzero means perform if conversion after reload. */
651 static int flag_if_conversion2;
653 /* Nonzero means to use global dataflow analysis to eliminate
654 useless null pointer tests. */
656 static int flag_delete_null_pointer_checks;
658 /* Nonzero means perform global CSE. */
662 /* Nonzero means to do the enhanced load motion during gcse, which trys
663 to hoist loads by not killing them when a store to the same location
666 int flag_gcse_lm = 1;
668 /* Nonzero means to perform store motion after gcse, which will try to
669 move stores closer to the exit block. Its not very effective without
672 int flag_gcse_sm = 1;
674 /* Nonzero means to rerun cse after loop optimization. This increases
675 compilation time about 20% and picks up a few more common expressions. */
677 static int flag_rerun_cse_after_loop;
679 /* Nonzero means to run loop optimizations twice. */
681 int flag_rerun_loop_opt;
683 /* Nonzero for -finline-functions: ok to inline functions that look like
684 good inline candidates. */
686 int flag_inline_functions;
688 /* Nonzero for -fkeep-inline-functions: even if we make a function
689 go inline everywhere, keep its definition around for debugging
692 int flag_keep_inline_functions;
694 /* Nonzero means that functions will not be inlined. */
696 int flag_no_inline = 2;
698 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
699 not just because the tree inliner turned us off. */
701 int flag_really_no_inline = 2;
703 /* Nonzero means that we should emit static const variables
704 regardless of whether or not optimization is turned on. */
706 int flag_keep_static_consts = 1;
708 /* Nonzero means we should be saving declaration info into a .X file. */
710 int flag_gen_aux_info = 0;
712 /* Specified name of aux-info file. */
714 static char *aux_info_file_name;
716 /* Nonzero means make the text shared if supported. */
718 int flag_shared_data;
720 /* Nonzero means schedule into delayed branch slots if supported. */
722 int flag_delayed_branch;
724 /* Nonzero if we are compiling pure (sharable) code.
725 Value is 1 if we are doing "small" pic; value is 2 if we're doing
730 /* Set to the default thread-local storage (tls) model to use. */
732 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
734 /* Nonzero means generate extra code for exception handling and enable
735 exception handling. */
739 /* Nonzero means generate frame unwind info table when supported. */
741 int flag_unwind_tables = 0;
743 /* Nonzero means generate frame unwind info table exact at each insn boundary */
745 int flag_asynchronous_unwind_tables = 0;
747 /* Nonzero means don't place uninitialized global data in common storage
752 /* Nonzero means change certain warnings into errors.
753 Usually these are warnings about failure to conform to some standard. */
755 int flag_pedantic_errors = 0;
757 /* flag_schedule_insns means schedule insns within basic blocks (before
759 flag_schedule_insns_after_reload means schedule insns after
762 int flag_schedule_insns = 0;
763 int flag_schedule_insns_after_reload = 0;
765 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
766 int flag_sched2_use_superblocks = 0;
768 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
770 int flag_sched2_use_traces = 0;
772 /* The following flags have effect only for scheduling before register
775 flag_schedule_interblock means schedule insns across basic blocks.
776 flag_schedule_speculative means allow speculative motion of non-load insns.
777 flag_schedule_speculative_load means allow speculative motion of some
779 flag_schedule_speculative_load_dangerous allows speculative motion of more
782 int flag_schedule_interblock = 1;
783 int flag_schedule_speculative = 1;
784 int flag_schedule_speculative_load = 0;
785 int flag_schedule_speculative_load_dangerous = 0;
787 int flag_single_precision_constant;
789 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
790 by a cheaper branch on a count register. */
791 int flag_branch_on_count_reg = 1;
793 /* -finhibit-size-directive inhibits output of .size for ELF.
794 This is used only for compiling crtstuff.c,
795 and it may be extended to other effects
796 needed for crtstuff.c on other systems. */
797 int flag_inhibit_size_directive = 0;
799 /* -fverbose-asm causes extra commentary information to be produced in
800 the generated assembly code (to make it more readable). This option
801 is generally only of use to those who actually need to read the
802 generated assembly code (perhaps while debugging the compiler itself).
803 -fno-verbose-asm, the default, causes the extra information
804 to be omitted and is useful when comparing two assembler files. */
806 int flag_verbose_asm = 0;
808 /* -dA causes debug commentary information to be produced in
809 the generated assembly code (to make it more readable). This option
810 is generally only of use to those who actually need to read the
811 generated assembly code (perhaps while debugging the compiler itself).
812 Currently, this switch is only used by dwarfout.c; however, it is intended
813 to be a catchall for printing debug information in the assembler file. */
815 int flag_debug_asm = 0;
817 /* -dP causes the rtl to be emitted as a comment in assembly. */
819 int flag_dump_rtl_in_asm = 0;
821 /* -fgnu-linker specifies use of the GNU linker for initializations.
822 (Or, more generally, a linker that handles initializations.)
823 -fno-gnu-linker says that collect2 will be used. */
825 int flag_gnu_linker = 0;
827 int flag_gnu_linker = 1;
830 /* Nonzero means put zero initialized data in the bss section. */
831 int flag_zero_initialized_in_bss = 1;
836 /* Enable ssa conditional constant propagation. */
837 int flag_ssa_ccp = 0;
839 /* Enable ssa aggressive dead code elimination. */
840 int flag_ssa_dce = 0;
842 /* Tag all structures with __attribute__(packed). */
843 int flag_pack_struct = 0;
845 /* Emit code to check for stack overflow; also may cause large objects
846 to be allocated dynamically. */
847 int flag_stack_check;
849 /* When non-NULL, indicates that whenever space is allocated on the
850 stack, the resulting stack pointer must not pass this
851 address---that is, for stacks that grow downward, the stack pointer
852 must always be greater than or equal to this address; for stacks
853 that grow upward, the stack pointer must be less than this address.
854 At present, the rtx may be either a REG or a SYMBOL_REF, although
855 the support provided depends on the backend. */
858 /* 0 if pointer arguments may alias each other. True in C.
859 1 if pointer arguments may not alias each other but may alias
861 2 if pointer arguments may not alias each other and may not
862 alias global variables. True in Fortran.
863 This defaults to 0 for C. */
864 int flag_argument_noalias = 0;
866 /* Nonzero if we should do (language-dependent) alias analysis.
867 Typically, this analysis will assume that expressions of certain
868 types do not alias expressions of certain other types. Only used
869 if alias analysis (in general) is enabled. */
870 int flag_strict_aliasing = 0;
872 /* Instrument functions with calls at entry and exit, for profiling. */
873 int flag_instrument_function_entry_exit = 0;
875 /* Nonzero means ignore `#ident' directives. 0 means handle them.
876 On SVR4 targets, it also controls whether or not to emit a
877 string identifying the compiler. */
879 int flag_no_ident = 0;
881 /* This will perform a peephole pass before sched2. */
882 int flag_peephole2 = 0;
884 /* This will try to guess branch probabilities. */
885 int flag_guess_branch_prob = 0;
887 /* -fcheck-bounds causes gcc to generate array bounds checks.
888 For C, C++, ObjC: defaults to off.
889 For Java: defaults to on.
890 For Fortran: defaults to off. */
891 int flag_bounds_check = 0;
893 /* This will attempt to merge constant section constants, if 1 only
894 string constants and constants from constant pool, if 2 also constant
896 int flag_merge_constants = 1;
898 /* If one, renumber instruction UIDs to reduce the number of
899 unused UIDs if there are a lot of instructions. If greater than
900 one, unconditionally renumber instruction UIDs. */
901 int flag_renumber_insns = 1;
903 /* If nonzero, use the graph coloring register allocator. */
904 int flag_new_regalloc = 0;
906 /* Nonzero if we perform superblock formation. */
910 /* Nonzero if we perform whole unit at a time compilation. */
912 int flag_unit_at_a_time = 0;
914 /* Values of the -falign-* flags: how much to align labels in code.
915 0 means `use default', 1 means `don't align'.
916 For each variable, there is an _log variant which is the power
917 of two not less than the variable, for .align output. */
921 int align_loops_max_skip;
924 int align_jumps_max_skip;
926 int align_labels_log;
927 int align_labels_max_skip;
929 int align_functions_log;
931 /* Like align_functions_log above, but used by front-ends to force the
932 minimum function alignment. Zero means no alignment is forced. */
933 int force_align_functions_log;
935 /* Table of supported debugging formats. */
938 const char *const arg;
939 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
940 constant expression, we use NO_DEBUG in its place. */
941 const enum debug_info_type debug_type;
942 const int use_extensions_p;
943 const char *const description;
947 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
948 N_("Generate debugging info in default format") },
949 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
950 #ifdef DBX_DEBUGGING_INFO
951 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
952 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
954 #ifdef DWARF_DEBUGGING_INFO
955 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
956 { "dwarf+", DWARF_DEBUG, 1,
957 N_("Generate extended DWARF-1 format debug info") },
959 #ifdef DWARF2_DEBUGGING_INFO
960 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
962 #ifdef XCOFF_DEBUGGING_INFO
963 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
964 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
966 #ifdef SDB_DEBUGGING_INFO
967 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
969 #ifdef VMS_DEBUGGING_INFO
970 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
977 const char *const string;
980 const char *const description;
982 lang_independent_options;
986 /* Add or remove a leading underscore from user symbols. */
987 int flag_leading_underscore = -1;
989 /* The user symbol prefix after having resolved same. */
990 const char *user_label_prefix;
992 static const param_info lang_independent_params[] = {
993 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
994 { OPTION, DEFAULT, HELP },
995 #include "params.def"
1000 /* Table of language-independent -f options.
1001 STRING is the option name. VARIABLE is the address of the variable.
1002 ON_VALUE is the value to store in VARIABLE
1003 if `-fSTRING' is seen as an option.
1004 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1006 static const lang_independent_options f_options[] =
1008 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
1009 N_("Perform DWARF2 duplicate elimination") },
1010 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1,
1011 N_("Perform unused type elimination in debug info") },
1012 {"float-store", &flag_float_store, 1,
1013 N_("Do not store floats in registers") },
1014 {"defer-pop", &flag_defer_pop, 1,
1015 N_("Defer popping functions args from stack until later") },
1016 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1017 N_("When possible do not generate stack frames") },
1018 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1019 N_("Optimize sibling and tail recursive calls") },
1020 {"tracer", &flag_tracer, 1,
1021 N_("Perform superblock formation via tail duplication") },
1022 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1023 N_("Compile whole compilation unit at a time") },
1024 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1025 N_("When running CSE, follow jumps to their targets") },
1026 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1027 N_("When running CSE, follow conditional jumps") },
1028 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1029 N_("Perform a number of minor, expensive optimizations") },
1030 {"thread-jumps", &flag_thread_jumps, 1,
1031 N_("Perform jump threading optimizations") },
1032 {"strength-reduce", &flag_strength_reduce, 1,
1033 N_("Perform strength reduction optimizations") },
1034 {"unroll-loops", &flag_unroll_loops, 1,
1035 N_("Perform loop unrolling when iteration count is known") },
1036 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1037 N_("Perform loop unrolling for all loops") },
1038 {"old-unroll-loops", &flag_old_unroll_loops, 1,
1039 N_("Perform loop unrolling when iteration count is known") },
1040 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1,
1041 N_("Perform loop unrolling for all loops") },
1042 {"peel-loops", &flag_peel_loops, 1,
1043 N_("Perform loop peeling") },
1044 {"unswitch-loops", &flag_unswitch_loops, 1,
1045 N_("Perform loop unswitching") },
1046 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1047 N_("Generate prefetch instructions, if available, for arrays in loops") },
1048 {"move-all-movables", &flag_move_all_movables, 1,
1049 N_("Force all loop invariant computations out of loops") },
1050 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1051 N_("Strength reduce all loop general induction variables") },
1052 {"writable-strings", &flag_writable_strings, 1,
1053 N_("Store strings in writable data section") },
1054 {"peephole", &flag_no_peephole, 0,
1055 N_("Enable machine specific peephole optimizations") },
1056 {"force-mem", &flag_force_mem, 1,
1057 N_("Copy memory operands into registers before using") },
1058 {"force-addr", &flag_force_addr, 1,
1059 N_("Copy memory address constants into regs before using") },
1060 {"function-cse", &flag_no_function_cse, 0,
1061 N_("Allow function addresses to be held in registers") },
1062 {"inline-functions", &flag_inline_functions, 1,
1063 N_("Integrate simple functions into their callers") },
1064 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1065 N_("Generate code for funcs even if they are fully inlined") },
1066 {"inline", &flag_no_inline, 0,
1067 N_("Pay attention to the 'inline' keyword") },
1068 {"keep-static-consts", &flag_keep_static_consts, 1,
1069 N_("Emit static const variables even if they are not used") },
1070 {"syntax-only", &flag_syntax_only, 1,
1071 N_("Check for syntax errors, then stop") },
1072 {"shared-data", &flag_shared_data, 1,
1073 N_("Mark data as shared rather than private") },
1074 {"caller-saves", &flag_caller_saves, 1,
1075 N_("Enable saving registers around function calls") },
1076 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1077 N_("Return 'short' aggregates in memory, not registers") },
1078 {"reg-struct-return", &flag_pcc_struct_return, 0,
1079 N_("Return 'short' aggregates in registers") },
1080 {"delayed-branch", &flag_delayed_branch, 1,
1081 N_("Attempt to fill delay slots of branch instructions") },
1082 {"gcse", &flag_gcse, 1,
1083 N_("Perform the global common subexpression elimination") },
1084 {"gcse-lm", &flag_gcse_lm, 1,
1085 N_("Perform enhanced load motion during global subexpression elimination") },
1086 {"gcse-sm", &flag_gcse_sm, 1,
1087 N_("Perform store motion after global subexpression elimination") },
1088 {"loop-optimize", &flag_loop_optimize, 1,
1089 N_("Perform the loop optimizations") },
1090 {"crossjumping", &flag_crossjumping, 1,
1091 N_("Perform cross-jumping optimization") },
1092 {"if-conversion", &flag_if_conversion, 1,
1093 N_("Perform conversion of conditional jumps to branchless equivalents") },
1094 {"if-conversion2", &flag_if_conversion2, 1,
1095 N_("Perform conversion of conditional jumps to conditional execution") },
1096 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1097 N_("Run CSE pass after loop optimizations") },
1098 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1099 N_("Run the loop optimizer twice") },
1100 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1101 N_("Delete useless null pointer checks") },
1102 {"schedule-insns", &flag_schedule_insns, 1,
1103 N_("Reschedule instructions before register allocation") },
1104 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1105 N_("Reschedule instructions after register allocation") },
1106 {"sched-interblock",&flag_schedule_interblock, 1,
1107 N_("Enable scheduling across basic blocks") },
1108 {"sched-spec",&flag_schedule_speculative, 1,
1109 N_("Allow speculative motion of non-loads") },
1110 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1111 N_("Allow speculative motion of some loads") },
1112 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1113 N_("Allow speculative motion of more loads") },
1114 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1115 N_("If scheduling post reload, do superblock sheduling") },
1116 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1117 N_("If scheduling post reload, do trace sheduling") },
1118 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1119 N_("Replace add,compare,branch with branch on count reg") },
1120 {"pic", &flag_pic, 1,
1121 N_("Generate position independent code, if possible") },
1122 {"PIC", &flag_pic, 2, ""},
1123 {"exceptions", &flag_exceptions, 1,
1124 N_("Enable exception handling") },
1125 {"unwind-tables", &flag_unwind_tables, 1,
1126 N_("Just generate unwind tables for exception handling") },
1127 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1128 N_("Generate unwind tables exact at each instruction boundary") },
1129 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1130 N_("Support synchronous non-call exceptions") },
1131 {"profile-arcs", &profile_arc_flag, 1,
1132 N_("Insert arc based program profiling code") },
1133 {"test-coverage", &flag_test_coverage, 1,
1134 N_("Create data files needed by gcov") },
1135 {"branch-probabilities", &flag_branch_probabilities, 1,
1136 N_("Use profiling information for branch probabilities") },
1137 {"profile", &profile_flag, 1,
1138 N_("Enable basic program profiling code") },
1139 {"reorder-blocks", &flag_reorder_blocks, 1,
1140 N_("Reorder basic blocks to improve code placement") },
1141 {"reorder-functions", &flag_reorder_functions, 1,
1142 N_("Reorder functions to improve code placement") },
1143 {"rename-registers", &flag_rename_registers, 1,
1144 N_("Do the register renaming optimization pass") },
1145 {"cprop-registers", &flag_cprop_registers, 1,
1146 N_("Do the register copy-propagation optimization pass") },
1147 {"common", &flag_no_common, 0,
1148 N_("Do not put uninitialized globals in the common section") },
1149 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1150 N_("Do not generate .size directives") },
1151 {"function-sections", &flag_function_sections, 1,
1152 N_("place each function into its own section") },
1153 {"data-sections", &flag_data_sections, 1,
1154 N_("place data items into their own section") },
1155 {"verbose-asm", &flag_verbose_asm, 1,
1156 N_("Add extra commentry to assembler output") },
1157 {"gnu-linker", &flag_gnu_linker, 1,
1158 N_("Output GNU ld formatted global initializers") },
1159 {"regmove", &flag_regmove, 1,
1160 N_("Enables a register move optimization") },
1161 {"optimize-register-move", &flag_regmove, 1,
1162 N_("Do the full regmove optimization pass") },
1163 {"pack-struct", &flag_pack_struct, 1,
1164 N_("Pack structure members together without holes") },
1165 {"stack-check", &flag_stack_check, 1,
1166 N_("Insert stack checking code into the program") },
1167 {"argument-alias", &flag_argument_noalias, 0,
1168 N_("Specify that arguments may alias each other & globals") },
1169 {"argument-noalias", &flag_argument_noalias, 1,
1170 N_("Assume arguments may alias globals but not each other") },
1171 {"argument-noalias-global", &flag_argument_noalias, 2,
1172 N_("Assume arguments do not alias each other or globals") },
1173 {"strict-aliasing", &flag_strict_aliasing, 1,
1174 N_("Assume strict aliasing rules apply") },
1175 {"align-loops", &align_loops, 0,
1176 N_("Align the start of loops") },
1177 {"align-jumps", &align_jumps, 0,
1178 N_("Align labels which are only reached by jumping") },
1179 {"align-labels", &align_labels, 0,
1180 N_("Align all labels") },
1181 {"align-functions", &align_functions, 0,
1182 N_("Align the start of functions") },
1183 {"merge-constants", &flag_merge_constants, 1,
1184 N_("Attempt to merge identical constants accross compilation units") },
1185 {"merge-all-constants", &flag_merge_constants, 2,
1186 N_("Attempt to merge identical constants and constant variables") },
1187 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1188 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1189 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1190 N_("Instrument function entry/exit with profiling calls") },
1191 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1192 N_("Put zero initialized data in the bss section") },
1193 {"ssa", &flag_ssa, 1,
1194 N_("Enable SSA optimizations") },
1195 {"ssa-ccp", &flag_ssa_ccp, 1,
1196 N_("Enable SSA conditional constant propagation") },
1197 {"ssa-dce", &flag_ssa_dce, 1,
1198 N_("Enable aggressive SSA dead code elimination") },
1199 {"leading-underscore", &flag_leading_underscore, 1,
1200 N_("External symbols have a leading underscore") },
1201 {"ident", &flag_no_ident, 0,
1202 N_("Process #ident directives") },
1203 { "peephole2", &flag_peephole2, 1,
1204 N_("Enables an rtl peephole pass run before sched2") },
1205 {"finite-math-only", &flag_finite_math_only, 1,
1206 N_("Assume no NaNs or +-Infs are generated") },
1207 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1208 N_("Enables guessing of branch probabilities") },
1209 {"math-errno", &flag_errno_math, 1,
1210 N_("Set errno after built-in math functions") },
1211 {"trapping-math", &flag_trapping_math, 1,
1212 N_("Floating-point operations can trap") },
1213 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1214 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1215 {"signaling-nans", &flag_signaling_nans, 1,
1216 N_("Disable optimizations observable by IEEE signaling NaNs") },
1217 {"bounds-check", &flag_bounds_check, 1,
1218 N_("Generate code to check bounds before indexing arrays") },
1219 {"single-precision-constant", &flag_single_precision_constant, 1,
1220 N_("Convert floating point constant to single precision constant") },
1221 {"time-report", &time_report, 1,
1222 N_("Report time taken by each compiler pass at end of run") },
1223 {"mem-report", &mem_report, 1,
1224 N_("Report on permanent memory allocation at end of run") },
1225 { "trapv", &flag_trapv, 1,
1226 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1227 { "new-ra", &flag_new_regalloc, 1,
1228 N_("Use graph coloring register allocation.") },
1231 /* Table of language-specific options. */
1233 static const struct lang_opt
1235 const char *const option;
1236 const char *const description;
1238 documented_lang_options[] =
1240 /* In order not to overload the --help output, the convention
1241 used here is to only describe those options which are not
1242 enabled by default. */
1245 N_("Compile just for ISO C90") },
1247 N_("Determine language standard") },
1249 { "-fsigned-bitfields", "" },
1250 { "-funsigned-bitfields",
1251 N_("Make bit-fields by unsigned by default") },
1252 { "-fno-signed-bitfields", "" },
1253 { "-fno-unsigned-bitfields","" },
1255 N_("Make 'char' be signed by default") },
1256 { "-funsigned-char",
1257 N_("Make 'char' be unsigned by default") },
1258 { "-fno-signed-char", "" },
1259 { "-fno-unsigned-char", "" },
1263 N_("Do not recognize the 'asm' keyword") },
1264 { "-fbuiltin", "" },
1266 N_("Do not recognize any built in functions") },
1268 N_("Assume normal C execution environment") },
1269 { "-fno-hosted", "" },
1271 N_("Assume that standard libraries & main might not exist") },
1272 { "-fno-freestanding", "" },
1273 { "-fcond-mismatch",
1274 N_("Allow different types as args of ? operator") },
1275 { "-fno-cond-mismatch", "" },
1276 { "-fdollars-in-identifiers",
1277 N_("Allow the use of $ inside identifiers") },
1278 { "-fno-dollars-in-identifiers", "" },
1279 { "-fpreprocessed", "" },
1280 { "-fno-preprocessed", "" },
1282 N_("Use the same size for double as for float") },
1283 { "-fno-short-double", "" },
1285 N_("Use the smallest fitting integer to hold enums") },
1286 { "-fno-short-enums", "" },
1288 N_("Override the underlying type for wchar_t to `unsigned short'") },
1289 { "-fno-short-wchar", "" },
1292 N_("Enable most warning messages") },
1293 { "-Wbad-function-cast",
1294 N_("Warn about casting functions to incompatible types") },
1295 { "-Wno-bad-function-cast", "" },
1296 { "-Wmissing-format-attribute",
1297 N_("Warn about functions which might be candidates for format attributes") },
1298 { "-Wno-missing-format-attribute", "" },
1300 N_("Warn about casts which discard qualifiers") },
1301 { "-Wno-cast-qual", "" },
1302 { "-Wchar-subscripts",
1303 N_("Warn about subscripts whose type is 'char'") },
1304 { "-Wno-char-subscripts", "" },
1306 N_("Warn if nested comments are detected") },
1307 { "-Wno-comment", "" },
1309 N_("Warn if nested comments are detected") },
1310 { "-Wno-comments", "" },
1312 N_("Warn about possibly confusing type conversions") },
1313 { "-Wno-conversion", "" },
1314 { "-Wdiv-by-zero", "" },
1315 { "-Wno-div-by-zero",
1316 N_("Do not warn about compile-time integer division by zero") },
1318 N_("Warn about testing equality of floating point numbers") },
1319 { "-Wno-float-equal", "" },
1321 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1322 { "-Wno-format", "" },
1323 { "-Wformat-extra-args", "" },
1324 { "-Wno-format-extra-args",
1325 N_("Don't warn about too many arguments to format functions") },
1326 { "-Wformat-nonliteral",
1327 N_("Warn about non-string-literal format strings") },
1328 { "-Wno-format-nonliteral", "" },
1329 { "-Wformat-security",
1330 N_("Warn about possible security problems with format functions") },
1331 { "-Wno-format-security", "" },
1332 { "-Wformat-y2k", "" },
1333 { "-Wno-format-y2k",
1334 N_("Don't warn about strftime formats yielding 2 digit years") },
1335 { "-Wimplicit-function-declaration",
1336 N_("Warn about implicit function declarations") },
1337 { "-Wno-implicit-function-declaration", "" },
1338 { "-Werror-implicit-function-declaration", "" },
1340 N_("Warn when a declaration does not specify a type") },
1341 { "-Wno-implicit-int", "" },
1342 { "-Wimplicit", "" },
1343 { "-Wno-implicit", "" },
1345 N_("Warn about the use of the #import directive") },
1346 { "-Wno-import", "" },
1348 N_("Warn about PCH files that are found but not used") },
1349 { "-Wlong-long","" },
1351 N_("Do not warn about using 'long long' when -pedantic") },
1353 N_("Warn about suspicious declarations of main") },
1354 { "-Wno-main", "" },
1355 { "-Wmissing-braces",
1356 N_("Warn about possibly missing braces around initializers") },
1357 { "-Wno-missing-braces", "" },
1358 { "-Wmissing-declarations",
1359 N_("Warn about global funcs without previous declarations") },
1360 { "-Wno-missing-declarations", "" },
1361 { "-Wmissing-prototypes",
1362 N_("Warn about global funcs without prototypes") },
1363 { "-Wno-missing-prototypes", "" },
1365 N_("Warn about use of multicharacter literals") },
1366 { "-Wno-multichar", "" },
1367 { "-Wnested-externs",
1368 N_("Warn about externs not at file scope level") },
1369 { "-Wno-nested-externs", "" },
1371 N_("Warn about possible missing parentheses") },
1372 { "-Wno-parentheses", "" },
1373 { "-Wpointer-arith",
1374 N_("Warn about function pointer arithmetic") },
1375 { "-Wno-pointer-arith", "" },
1376 { "-Wredundant-decls",
1377 N_("Warn about multiple declarations of the same object") },
1378 { "-Wno-redundant-decls", "" },
1380 N_("Warn whenever a function's return-type defaults to int") },
1381 { "-Wno-return-type", "" },
1382 { "-Wsequence-point",
1383 N_("Warn about possible violations of sequence point rules") },
1384 { "-Wno-sequence-point", "" },
1386 N_("Warn about signed/unsigned comparisons") },
1387 { "-Wno-sign-compare", "" },
1388 { "-Wstrict-prototypes",
1389 N_("Warn about non-prototyped function decls") },
1390 { "-Wno-strict-prototypes", "" },
1392 N_("Warn about constructs whose meanings change in ISO C") },
1393 { "-Wno-traditional", "" },
1395 N_("Warn when trigraphs are encountered") },
1396 { "-Wno-trigraphs", "" },
1398 { "-Wno-undef", "" },
1399 { "-Wunknown-pragmas",
1400 N_("Warn about unrecognized pragmas") },
1401 { "-Wno-unknown-pragmas", "" },
1402 { "-Wwrite-strings",
1403 N_("Mark strings as 'const char *'") },
1404 { "-Wno-write-strings", "" },
1406 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1408 #include "options.h"
1412 /* Here is a table, controlled by the tm.h file, listing each -m switch
1413 and which bits in `target_switches' it should set or clear.
1414 If VALUE is positive, it is bits to set.
1415 If VALUE is negative, -VALUE is bits to clear.
1416 (The sign bit is not used so there is no confusion.) */
1420 const char *const name;
1422 const char *const description;
1424 target_switches[] = TARGET_SWITCHES;
1426 /* This table is similar, but allows the switch to have a value. */
1428 #ifdef TARGET_OPTIONS
1431 const char *const prefix;
1432 const char **const variable;
1433 const char *const description;
1435 target_options[] = TARGET_OPTIONS;
1438 /* Options controlling warnings. */
1440 /* Don't print warning messages. -w. */
1442 int inhibit_warnings = 0;
1444 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1446 int warn_system_headers = 0;
1448 /* Print various extra warnings. -W/-Wextra. */
1450 int extra_warnings = 0;
1452 /* Treat warnings as errors. -Werror. */
1454 int warnings_are_errors = 0;
1456 /* Nonzero to warn about unused variables, functions et.al. */
1458 int warn_unused_function;
1459 int warn_unused_label;
1460 int warn_unused_parameter;
1461 int warn_unused_variable;
1462 int warn_unused_value;
1464 /* Nonzero to warn about code which is never reached. */
1466 int warn_notreached;
1468 /* Nonzero to warn about variables used before they are initialized. */
1470 int warn_uninitialized;
1472 /* Nonzero means warn about all declarations which shadow others. */
1476 /* Warn if a switch on an enum, that does not have a default case,
1477 fails to have a case for every enum value. */
1481 /* Warn if a switch does not have a default case. */
1483 int warn_switch_default;
1485 /* Warn if a switch on an enum fails to have a case for every enum
1486 value (regardless of the presence or otherwise of a default case). */
1488 int warn_switch_enum;
1490 /* Nonzero means warn about function definitions that default the return type
1491 or that use a null return and have a return-type other than void. */
1493 int warn_return_type;
1495 /* Nonzero means warn about pointer casts that increase the required
1496 alignment of the target type (and might therefore lead to a crash
1497 due to a misaligned access). */
1499 int warn_cast_align;
1501 /* Nonzero means warn about any objects definitions whose size is larger
1502 than N bytes. Also want about function definitions whose returned
1503 values are larger than N bytes. The value N is in `larger_than_size'. */
1505 int warn_larger_than;
1506 HOST_WIDE_INT larger_than_size;
1508 /* Nonzero means warn if inline function is too large. */
1512 /* Warn if a function returns an aggregate,
1513 since there are often incompatible calling conventions for doing this. */
1515 int warn_aggregate_return;
1517 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1521 /* Warn when gcc pads a structure to an alignment boundary. */
1525 /* Warn when an optimization pass is disabled. */
1527 int warn_disabled_optimization;
1529 /* Warn about functions which might be candidates for attribute noreturn. */
1531 int warn_missing_noreturn;
1533 /* Nonzero means warn about uses of __attribute__((deprecated))
1536 int warn_deprecated_decl = 1;
1538 /* Nonzero means warn about constructs which might not be
1539 strict-aliasing safe. */
1541 int warn_strict_aliasing;
1543 /* Like f_options, but for -W. */
1545 static const lang_independent_options W_options[] =
1547 {"unused-function", &warn_unused_function, 1,
1548 N_("Warn when a function is unused") },
1549 {"unused-label", &warn_unused_label, 1,
1550 N_("Warn when a label is unused") },
1551 {"unused-parameter", &warn_unused_parameter, 1,
1552 N_("Warn when a function parameter is unused") },
1553 {"unused-variable", &warn_unused_variable, 1,
1554 N_("Warn when a variable is unused") },
1555 {"unused-value", &warn_unused_value, 1,
1556 N_("Warn when an expression value is unused") },
1557 {"system-headers", &warn_system_headers, 1,
1558 N_("Do not suppress warnings from system headers") },
1559 {"error", &warnings_are_errors, 1,
1560 N_("Treat all warnings as errors") },
1561 {"shadow", &warn_shadow, 1,
1562 N_("Warn when one local variable shadows another") },
1563 {"switch", &warn_switch, 1,
1564 N_("Warn about enumerated switches, with no default, missing a case") },
1565 {"switch-default", &warn_switch_default, 1,
1566 N_("Warn about enumerated switches missing a default case") },
1567 {"switch-enum", &warn_switch_enum, 1,
1568 N_("Warn about all enumerated switches missing a specific case") },
1569 {"aggregate-return", &warn_aggregate_return, 1,
1570 N_("Warn about returning structures, unions or arrays") },
1571 {"cast-align", &warn_cast_align, 1,
1572 N_("Warn about pointer casts which increase alignment") },
1573 {"unreachable-code", &warn_notreached, 1,
1574 N_("Warn about code that will never be executed") },
1575 {"uninitialized", &warn_uninitialized, 1,
1576 N_("Warn about uninitialized automatic variables") },
1577 {"inline", &warn_inline, 1,
1578 N_("Warn when an inlined function cannot be inlined") },
1579 {"packed", &warn_packed, 1,
1580 N_("Warn when the packed attribute has no effect on struct layout") },
1581 {"padded", &warn_padded, 1,
1582 N_("Warn when padding is required to align struct members") },
1583 {"disabled-optimization", &warn_disabled_optimization, 1,
1584 N_("Warn when an optimization pass is disabled") },
1585 {"deprecated-declarations", &warn_deprecated_decl, 1,
1586 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1587 {"extra", &extra_warnings, 1,
1588 N_("Print extra (possibly unwanted) warnings") },
1589 {"missing-noreturn", &warn_missing_noreturn, 1,
1590 N_("Warn about functions which might be candidates for attribute noreturn") },
1591 {"strict-aliasing", &warn_strict_aliasing, 1,
1592 N_ ("Warn about code which might break the strict aliasing rules") }
1596 set_Wunused (setting)
1599 warn_unused_function = setting;
1600 warn_unused_label = setting;
1601 /* Unused function parameter warnings are reported when either ``-W
1602 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1603 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1605 warn_unused_parameter = 0;
1606 else if (!warn_unused_parameter)
1607 warn_unused_parameter = -1;
1608 warn_unused_variable = setting;
1609 warn_unused_value = setting;
1612 /* The following routines are useful in setting all the flags that
1613 -ffast-math and -fno-fast-math imply. */
1616 set_fast_math_flags (set)
1619 flag_trapping_math = !set;
1620 flag_unsafe_math_optimizations = set;
1621 flag_finite_math_only = set;
1622 flag_errno_math = !set;
1624 flag_signaling_nans = 0;
1627 /* Return true iff flags are set as if -ffast-math. */
1629 fast_math_flags_set_p ()
1631 return (!flag_trapping_math
1632 && flag_unsafe_math_optimizations
1633 && flag_finite_math_only
1634 && !flag_errno_math);
1638 /* Output files for assembler code (real compiler output)
1639 and debugging dumps. */
1642 FILE *aux_info_file;
1643 FILE *rtl_dump_file = NULL;
1645 /* Decode the string P as an integral parameter.
1646 If the string is indeed an integer return its numeric value else
1647 issue an Invalid Option error for the option PNAME and return DEFVAL.
1648 If PNAME is zero just return DEFVAL, do not call error. */
1651 read_integral_parameter (p, pname, defval)
1656 const char *endp = p;
1660 if (ISDIGIT (*endp))
1669 error ("invalid option `%s'", pname);
1676 /* This calls abort and is used to avoid problems when abort is a macro.
1677 It is used when we need to pass the address of abort. */
1685 /* When `malloc.c' is compiled with `rcheck' defined,
1686 it calls this function to report clobberage. */
1690 const char *s ATTRIBUTE_UNUSED;
1695 /* Return the logarithm of X, base 2, considering X unsigned,
1696 if X is a power of 2. Otherwise, returns -1.
1698 This should be used via the `exact_log2' macro. */
1702 unsigned HOST_WIDE_INT x;
1705 /* Test for 0 or a power of 2. */
1706 if (x == 0 || x != (x & -x))
1708 while ((x >>= 1) != 0)
1713 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1714 If X is 0, return -1.
1716 This should be used via the floor_log2 macro. */
1720 unsigned HOST_WIDE_INT x;
1729 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1730 into ICE messages, which is much more user friendly. */
1733 crash_signal (signo)
1736 internal_error ("%s", strsignal (signo));
1739 /* Arrange to dump core on error. (The regular error message is still
1740 printed first, except in the case of abort().) */
1743 setup_core_dumping ()
1746 signal (SIGABRT, SIG_DFL);
1748 #if defined(HAVE_SETRLIMIT)
1751 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1752 fatal_io_error ("getting core file size maximum limit");
1753 rlim.rlim_cur = rlim.rlim_max;
1754 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1755 fatal_io_error ("setting core file size limit to maximum");
1758 diagnostic_abort_on_error (global_dc);
1762 /* Strip off a legitimate source ending from the input string NAME of
1763 length LEN. Rather than having to know the names used by all of
1764 our front ends, we strip off an ending of a period followed by
1765 up to five characters. (Java uses ".class".) */
1768 strip_off_ending (name, len)
1773 for (i = 2; i < 6 && len > i; i++)
1775 if (name[len - i] == '.')
1777 name[len - i] = '\0';
1783 /* Output a quoted string. */
1786 output_quoted_string (asm_file, string)
1790 #ifdef OUTPUT_QUOTED_STRING
1791 OUTPUT_QUOTED_STRING (asm_file, string);
1795 putc ('\"', asm_file);
1796 while ((c = *string++) != 0)
1800 if (c == '\"' || c == '\\')
1801 putc ('\\', asm_file);
1805 fprintf (asm_file, "\\%03o", (unsigned char) c);
1807 putc ('\"', asm_file);
1811 /* Output NAME into FILE after having turned it into something
1812 usable as an identifier in a target's assembly file. */
1814 output_clean_symbol_name (file, name)
1818 /* Make a copy of NAME. */
1819 char *id = xstrdup (name);
1821 /* Make it look like a valid identifier for an assembler. */
1822 clean_symbol_name (id);
1829 /* Output a file name in the form wanted by System V. */
1832 output_file_directive (asm_file, input_name)
1834 const char *input_name;
1836 int len = strlen (input_name);
1837 const char *na = input_name + len;
1839 /* NA gets INPUT_NAME sans directory names. */
1840 while (na > input_name)
1842 if (IS_DIR_SEPARATOR (na[-1]))
1847 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1848 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1850 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1851 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1853 fprintf (asm_file, "\t.file\t");
1854 output_quoted_string (asm_file, na);
1855 fputc ('\n', asm_file);
1860 /* Routine to open a dump file. Return true if the dump file is enabled. */
1863 open_dump_file (index, decl)
1864 enum dump_file_index index;
1868 const char *open_arg;
1871 if (! dump_file[index].enabled)
1874 timevar_push (TV_DUMP);
1875 if (rtl_dump_file != NULL)
1876 fclose (rtl_dump_file);
1878 sprintf (seq, DUMPFILE_FORMAT, index);
1880 if (! dump_file[index].initialized)
1882 /* If we've not initialized the files, do so now. */
1883 if (graph_dump_format != no_graph
1884 && dump_file[index].graph_dump_p)
1886 dump_name = concat (seq, dump_file[index].extension, NULL);
1887 clean_graph_dump_file (dump_base_name, dump_name);
1890 dump_file[index].initialized = 1;
1896 dump_name = concat (dump_base_name, seq,
1897 dump_file[index].extension, NULL);
1899 rtl_dump_file = fopen (dump_name, open_arg);
1900 if (rtl_dump_file == NULL)
1901 fatal_io_error ("can't open %s", dump_name);
1906 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1907 (*lang_hooks.decl_printable_name) (decl, 2),
1908 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1910 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1911 ? " (unlikely executed)"
1914 timevar_pop (TV_DUMP);
1918 /* Routine to close a dump file. */
1921 close_dump_file (index, func, insns)
1922 enum dump_file_index index;
1923 void (*func) PARAMS ((FILE *, rtx));
1926 if (! rtl_dump_file)
1929 timevar_push (TV_DUMP);
1931 && graph_dump_format != no_graph
1932 && dump_file[index].graph_dump_p)
1937 sprintf (seq, DUMPFILE_FORMAT, index);
1938 suffix = concat (seq, dump_file[index].extension, NULL);
1939 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1944 func (rtl_dump_file, insns);
1946 fflush (rtl_dump_file);
1947 fclose (rtl_dump_file);
1949 rtl_dump_file = NULL;
1950 timevar_pop (TV_DUMP);
1953 /* Do any final processing required for the declarations in VEC, of
1954 which there are LEN. We write out inline functions and variables
1955 that have been deferred until this point, but which are required.
1956 Returns nonzero if anything was put out. */
1959 wrapup_global_declarations (vec, len)
1966 int output_something = 0;
1968 for (i = 0; i < len; i++)
1972 /* We're not deferring this any longer. Assignment is
1973 conditional to avoid needlessly dirtying PCH pages. */
1974 if (DECL_DEFER_OUTPUT (decl) != 0)
1975 DECL_DEFER_OUTPUT (decl) = 0;
1977 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1978 (*lang_hooks.finish_incomplete_decl) (decl);
1981 /* Now emit any global variables or functions that we have been
1982 putting off. We need to loop in case one of the things emitted
1983 here references another one which comes earlier in the list. */
1987 for (i = 0; i < len; i++)
1991 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1994 /* Don't write out static consts, unless we still need them.
1996 We also keep static consts if not optimizing (for debugging),
1997 unless the user specified -fno-keep-static-consts.
1998 ??? They might be better written into the debug information.
1999 This is possible when using DWARF.
2001 A language processor that wants static constants to be always
2002 written out (even if it is not used) is responsible for
2003 calling rest_of_decl_compilation itself. E.g. the C front-end
2004 calls rest_of_decl_compilation from finish_decl.
2005 One motivation for this is that is conventional in some
2006 environments to write things like:
2007 static const char rcsid[] = "... version string ...";
2008 intending to force the string to be in the executable.
2010 A language processor that would prefer to have unneeded
2011 static constants "optimized away" would just defer writing
2012 them out until here. E.g. C++ does this, because static
2013 constants are often defined in header files.
2015 ??? A tempting alternative (for both C and C++) would be
2016 to force a constant to be written if and only if it is
2017 defined in a main file, as opposed to an include file. */
2019 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2023 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2025 else if (DECL_COMDAT (decl))
2027 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
2028 && (optimize || !flag_keep_static_consts
2029 || DECL_ARTIFICIAL (decl)))
2035 rest_of_decl_compilation (decl, NULL, 1, 1);
2039 if (TREE_CODE (decl) == FUNCTION_DECL
2040 && DECL_INITIAL (decl) != 0
2041 && DECL_SAVED_INSNS (decl) != 0
2042 && (flag_keep_inline_functions
2043 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2044 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2047 output_inline_function (decl);
2052 output_something = 1;
2056 return output_something;
2059 /* Issue appropriate warnings for the global declarations in VEC (of
2060 which there are LEN). Output debugging information for them. */
2063 check_global_declarations (vec, len)
2070 for (i = 0; i < len; i++)
2074 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2075 && ! TREE_ASM_WRITTEN (decl))
2076 /* Cancel the RTL for this decl so that, if debugging info
2077 output for global variables is still to come,
2078 this one will be omitted. */
2079 SET_DECL_RTL (decl, NULL_RTX);
2081 /* Warn about any function
2082 declared static but not defined.
2083 We don't warn about variables,
2084 because many programs have static variables
2085 that exist only to get some text into the object file. */
2086 if (TREE_CODE (decl) == FUNCTION_DECL
2087 && (warn_unused_function
2088 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2089 && DECL_INITIAL (decl) == 0
2090 && DECL_EXTERNAL (decl)
2091 && ! DECL_ARTIFICIAL (decl)
2092 && ! TREE_PUBLIC (decl))
2094 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2095 pedwarn_with_decl (decl,
2096 "`%s' used but never defined");
2098 warning_with_decl (decl,
2099 "`%s' declared `static' but never defined");
2100 /* This symbol is effectively an "extern" declaration now. */
2101 TREE_PUBLIC (decl) = 1;
2102 assemble_external (decl);
2105 /* Warn about static fns or vars defined but not used. */
2106 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2107 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2108 && ! TREE_USED (decl)
2109 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2110 to handle multiple external decls in different scopes. */
2111 && ! TREE_USED (DECL_NAME (decl))
2112 && ! DECL_EXTERNAL (decl)
2113 && ! TREE_PUBLIC (decl)
2114 /* Global register variables must be declared to reserve them. */
2115 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2116 /* Otherwise, ask the language. */
2117 && (*lang_hooks.decls.warn_unused_global) (decl))
2118 warning_with_decl (decl, "`%s' defined but not used");
2120 /* Avoid confusing the debug information machinery when there are
2122 if (errorcount == 0 && sorrycount == 0)
2124 timevar_push (TV_SYMOUT);
2125 (*debug_hooks->global_decl) (decl);
2126 timevar_pop (TV_SYMOUT);
2131 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2132 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2133 INPUT_FILENAME and LINENO accordingly. */
2136 push_srcloc (file, line)
2140 struct file_stack *fs;
2142 if (input_file_stack)
2144 input_file_stack->name = input_filename;
2145 input_file_stack->line = lineno;
2148 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2149 fs->name = input_filename = file;
2150 fs->line = lineno = line;
2151 fs->next = input_file_stack;
2152 input_file_stack = fs;
2153 input_file_stack_tick++;
2156 /* Pop the top entry off the stack of presently open source files.
2157 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2163 struct file_stack *fs;
2165 fs = input_file_stack;
2166 input_file_stack = fs->next;
2168 input_file_stack_tick++;
2170 if (input_file_stack)
2172 input_filename = input_file_stack->name;
2173 lineno = input_file_stack->line;
2177 input_filename = NULL;
2182 /* Compile an entire translation unit. Write a file of assembly
2183 output and various debugging dumps. */
2188 /* Initialize yet another pass. */
2190 init_final (main_input_filename);
2191 init_branch_prob (aux_base_name);
2193 timevar_push (TV_PARSE);
2195 /* Call the parser, which parses the entire file (calling
2196 rest_of_compilation for each function). */
2197 (*lang_hooks.parse_file) (set_yydebug);
2199 /* In case there were missing block closers,
2200 get us back to the global binding level. */
2201 (*lang_hooks.clear_binding_stack) ();
2203 /* Compilation is now finished except for writing
2204 what's left of the symbol table output. */
2205 timevar_pop (TV_PARSE);
2207 if (flag_syntax_only)
2210 (*lang_hooks.decls.final_write_globals)();
2212 if (profile_arc_flag)
2213 /* This must occur after the loop to output deferred functions.
2214 Else the profiler initializer would not be emitted if all the
2215 functions in this compilation unit were deferred. */
2218 /* Write out any pending weak symbol declarations. */
2222 /* Do dbx symbols. */
2223 timevar_push (TV_SYMOUT);
2225 #ifdef DWARF2_UNWIND_INFO
2226 if (dwarf2out_do_frame ())
2227 dwarf2out_frame_finish ();
2230 (*debug_hooks->finish) (main_input_filename);
2231 timevar_pop (TV_SYMOUT);
2233 /* Output some stuff at end of file if nec. */
2235 dw2_output_indirect_constants ();
2237 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2239 timevar_push (TV_DUMP);
2240 open_dump_file (DFI_bp, NULL);
2244 close_dump_file (DFI_bp, NULL, NULL_RTX);
2245 timevar_pop (TV_DUMP);
2249 ASM_FILE_END (asm_out_file);
2252 /* Attach a special .ident directive to the end of the file to identify
2253 the version of GCC which compiled this code. The format of the .ident
2254 string is patterned after the ones produced by native SVR4 compilers. */
2257 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2258 IDENT_ASM_OP, version_string);
2261 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2263 timevar_push (TV_DUMP);
2264 dump_combine_total_stats (rtl_dump_file);
2265 close_dump_file (DFI_combine, NULL, NULL_RTX);
2266 timevar_pop (TV_DUMP);
2270 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2271 and TYPE_DECL nodes.
2273 This does nothing for local (non-static) variables, unless the
2274 variable is a register variable with an ASMSPEC. In that case, or
2275 if the variable is not an automatic, it sets up the RTL and
2276 outputs any assembler code (label definition, storage allocation
2277 and initialization).
2279 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2280 the assembler symbol name to be used. TOP_LEVEL is nonzero
2281 if this declaration is not within a function. */
2284 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2286 const char *asmspec;
2290 /* We deferred calling assemble_alias so that we could collect
2291 other attributes such as visibility. Emit the alias now. */
2294 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2297 alias = TREE_VALUE (TREE_VALUE (alias));
2298 alias = get_identifier (TREE_STRING_POINTER (alias));
2299 assemble_alias (decl, alias);
2303 /* Forward declarations for nested functions are not "external",
2304 but we need to treat them as if they were. */
2305 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2306 || TREE_CODE (decl) == FUNCTION_DECL)
2308 timevar_push (TV_VARCONST);
2311 make_decl_rtl (decl, asmspec);
2313 /* Don't output anything when a tentative file-scope definition
2314 is seen. But at end of compilation, do output code for them. */
2315 if (at_end || !DECL_DEFER_OUTPUT (decl))
2316 assemble_variable (decl, top_level, at_end, 0);
2318 #ifdef ASM_FINISH_DECLARE_OBJECT
2319 if (decl == last_assemble_variable_decl)
2321 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2326 timevar_pop (TV_VARCONST);
2328 else if (DECL_REGISTER (decl) && asmspec != 0)
2330 if (decode_reg_name (asmspec) >= 0)
2332 SET_DECL_RTL (decl, NULL_RTX);
2333 make_decl_rtl (decl, asmspec);
2337 error ("invalid register name `%s' for register variable", asmspec);
2338 DECL_REGISTER (decl) = 0;
2343 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2344 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2345 && TREE_CODE (decl) == TYPE_DECL)
2347 timevar_push (TV_SYMOUT);
2348 dbxout_symbol (decl, 0);
2349 timevar_pop (TV_SYMOUT);
2352 #ifdef SDB_DEBUGGING_INFO
2353 else if (write_symbols == SDB_DEBUG && top_level
2354 && TREE_CODE (decl) == TYPE_DECL)
2356 timevar_push (TV_SYMOUT);
2357 sdbout_symbol (decl, 0);
2358 timevar_pop (TV_SYMOUT);
2361 #ifdef DWARF2_DEBUGGING_INFO
2362 else if ((write_symbols == DWARF2_DEBUG
2363 || write_symbols == VMS_AND_DWARF2_DEBUG)
2365 && TREE_CODE (decl) == TYPE_DECL)
2367 timevar_push (TV_SYMOUT);
2368 dwarf2out_decl (decl);
2369 timevar_pop (TV_SYMOUT);
2374 /* Called after finishing a record, union or enumeral type. */
2377 rest_of_type_compilation (type, toplev)
2378 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2379 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2383 tree type ATTRIBUTE_UNUSED;
2384 int toplev ATTRIBUTE_UNUSED;
2387 /* Avoid confusing the debug information machinery when there are
2389 if (errorcount != 0 || sorrycount != 0)
2392 timevar_push (TV_SYMOUT);
2393 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2394 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2395 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2397 #ifdef SDB_DEBUGGING_INFO
2398 if (write_symbols == SDB_DEBUG)
2399 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2401 #ifdef DWARF2_DEBUGGING_INFO
2402 if ((write_symbols == DWARF2_DEBUG
2403 || write_symbols == VMS_AND_DWARF2_DEBUG)
2405 dwarf2out_decl (TYPE_STUB_DECL (type));
2407 timevar_pop (TV_SYMOUT);
2410 /* This is called from finish_function (within langhooks.parse_file)
2411 after each top-level definition is parsed.
2412 It is supposed to compile that function or variable
2413 and output the assembler code for it.
2414 After we return, the tree storage is freed. */
2417 rest_of_compilation (decl)
2423 int rebuild_label_notes_after_reload;
2425 timevar_push (TV_REST_OF_COMPILATION);
2427 /* Now that we're out of the frontend, we shouldn't have any more
2428 CONCATs anywhere. */
2429 generating_concat_p = 0;
2431 /* When processing delayed functions, prepare_function_start() won't
2432 have been run to re-initialize it. */
2433 cse_not_expected = ! optimize;
2435 /* First, make sure that NOTE_BLOCK is set correctly for each
2436 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2437 if (!cfun->x_whole_function_mode_p)
2440 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2441 tree in sensible shape. So, we just recalculate it here. */
2442 if (cfun->x_whole_function_mode_p)
2447 /* If we are reconsidering an inline function
2448 at the end of compilation, skip the stuff for making it inline. */
2450 if (DECL_SAVED_INSNS (decl) == 0)
2456 /* If this is nested inside an inlined external function, pretend
2457 it was only declared. Since we cannot inline such functions,
2458 generating code for this one is not only not necessary but will
2459 confuse some debugging output writers. */
2460 for (parent = DECL_CONTEXT (current_function_decl);
2461 parent != NULL_TREE;
2462 parent = get_containing_scope (parent))
2463 if (TREE_CODE (parent) == FUNCTION_DECL
2464 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2466 DECL_INITIAL (decl) = 0;
2467 goto exit_rest_of_compilation;
2469 else if (TYPE_P (parent))
2470 /* A function in a local class should be treated normally. */
2473 /* If requested, consider whether to make this function inline. */
2474 if ((DECL_INLINE (decl) && !flag_no_inline)
2475 || flag_inline_functions)
2477 timevar_push (TV_INTEGRATION);
2478 lose = function_cannot_inline_p (decl);
2479 timevar_pop (TV_INTEGRATION);
2480 if (lose || ! optimize)
2482 if (warn_inline && DECL_INLINE (decl))
2483 warning_with_decl (decl, lose);
2484 DECL_ABSTRACT_ORIGIN (decl) = 0;
2485 /* Don't really compile an extern inline function.
2486 If we can't make it inline, pretend
2487 it was only declared. */
2488 if (DECL_EXTERNAL (decl))
2490 DECL_INITIAL (decl) = 0;
2491 goto exit_rest_of_compilation;
2495 /* ??? Note that we used to just make it look like if
2496 the "inline" keyword was specified when we decide
2497 to inline it (because of -finline-functions).
2498 garloff@suse.de, 2002-04-24: Add another flag to
2499 actually record this piece of information. */
2500 if (!DECL_INLINE (decl))
2501 DID_INLINE_FUNC (decl) = 1;
2502 inlinable = DECL_INLINE (decl) = 1;
2506 insns = get_insns ();
2508 /* Dump the rtl code if we are dumping rtl. */
2510 if (open_dump_file (DFI_rtl, decl))
2512 if (DECL_SAVED_INSNS (decl))
2513 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2514 close_dump_file (DFI_rtl, print_rtl, insns);
2517 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2518 sorts of eh initialization. Delay this until after the
2519 initial rtl dump so that we can see the original nesting. */
2520 convert_from_eh_region_ranges ();
2522 /* If function is inline, and we don't yet know whether to
2523 compile it by itself, defer decision till end of compilation.
2524 wrapup_global_declarations will (indirectly) call
2525 rest_of_compilation again for those functions that need to
2526 be output. Also defer those functions that we are supposed
2530 || (DECL_INLINE (decl)
2531 && flag_inline_functions
2532 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2533 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2534 && ! flag_keep_inline_functions)
2535 || DECL_EXTERNAL (decl))))
2536 DECL_DEFER_OUTPUT (decl) = 1;
2538 if (DECL_INLINE (decl))
2539 /* DWARF wants separate debugging info for abstract and
2540 concrete instances of all inline functions, including those
2541 declared inline but not inlined, and those inlined even
2542 though they weren't declared inline. Conveniently, that's
2543 what DECL_INLINE means at this point. */
2544 (*debug_hooks->deferred_inline_function) (decl);
2546 if (DECL_DEFER_OUTPUT (decl))
2548 /* If -Wreturn-type, we have to do a bit of compilation. We just
2549 want to call cleanup the cfg to figure out whether or not we can
2550 fall off the end of the function; we do the minimum amount of
2551 work necessary to make that safe. */
2552 if (warn_return_type)
2554 int saved_optimize = optimize;
2557 rebuild_jump_labels (insns);
2558 find_exception_handler_labels ();
2559 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2560 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2561 optimize = saved_optimize;
2563 /* CFG is no longer maintained up-to-date. */
2564 free_bb_for_insn ();
2567 set_nothrow_function_flags ();
2568 if (current_function_nothrow)
2569 /* Now we know that this can't throw; set the flag for the benefit
2570 of other functions later in this translation unit. */
2571 TREE_NOTHROW (current_function_decl) = 1;
2573 timevar_push (TV_INTEGRATION);
2574 save_for_inline (decl);
2575 timevar_pop (TV_INTEGRATION);
2576 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2577 goto exit_rest_of_compilation;
2580 /* If specified extern inline but we aren't inlining it, we are
2581 done. This goes for anything that gets here with DECL_EXTERNAL
2582 set, not just things with DECL_INLINE. */
2583 if (DECL_EXTERNAL (decl))
2584 goto exit_rest_of_compilation;
2587 /* If we're emitting a nested function, make sure its parent gets
2588 emitted as well. Doing otherwise confuses debug info. */
2591 for (parent = DECL_CONTEXT (current_function_decl);
2592 parent != NULL_TREE;
2593 parent = get_containing_scope (parent))
2594 if (TREE_CODE (parent) == FUNCTION_DECL)
2595 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2598 /* We are now committed to emitting code for this function. Do any
2599 preparation, such as emitting abstract debug info for the inline
2600 before it gets mangled by optimization. */
2601 if (DECL_INLINE (decl))
2602 (*debug_hooks->outlining_inline_function) (decl);
2604 /* Remove any notes we don't need. That will make iterating
2605 over the instruction sequence faster, and allow the garbage
2606 collector to reclaim the memory used by the notes. */
2607 remove_unnecessary_notes ();
2612 /* Initialize some variables used by the optimizers. */
2613 init_function_for_compilation ();
2615 if (! DECL_DEFER_OUTPUT (decl))
2616 TREE_ASM_WRITTEN (decl) = 1;
2618 /* Now that integrate will no longer see our rtl, we need not
2619 distinguish between the return value of this function and the
2620 return value of called functions. Also, we can remove all SETs
2621 of subregs of hard registers; they are only here because of
2622 integrate. Also, we can now initialize pseudos intended to
2623 carry magic hard reg data throughout the function. */
2624 rtx_equal_function_value_matters = 0;
2625 purge_hard_subreg_sets (get_insns ());
2627 /* Early return if there were errors. We can run afoul of our
2628 consistency checks, and there's not really much point in fixing them.
2629 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2630 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2631 || errorcount || sorrycount)
2632 goto exit_rest_of_compilation;
2634 timevar_push (TV_JUMP);
2635 open_dump_file (DFI_sibling, decl);
2636 insns = get_insns ();
2637 rebuild_jump_labels (insns);
2638 find_exception_handler_labels ();
2639 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2641 delete_unreachable_blocks ();
2643 /* We have to issue these warnings now already, because CFG cleanups
2644 further down may destroy the required information. */
2645 check_function_return_warnings ();
2647 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2648 if (flag_guess_branch_prob)
2650 timevar_push (TV_BRANCH_PROB);
2651 note_prediction_to_br_prob ();
2652 timevar_pop (TV_BRANCH_PROB);
2655 /* We may have potential sibling or tail recursion sites. Select one
2656 (of possibly multiple) methods of performing the call. */
2657 if (flag_optimize_sibling_calls)
2660 optimize_sibling_and_tail_recursive_calls ();
2662 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2663 free_bb_for_insn ();
2664 find_exception_handler_labels ();
2665 rebuild_jump_labels (insns);
2666 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2668 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2669 notes before simplifying cfg and we must do lowering after sibcall
2670 that unhides parts of RTL chain and cleans up the CFG.
2672 Until sibcall is replaced by tree-level optimizer, lets just
2673 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2674 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2675 if (GET_CODE (insn) == NOTE
2676 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2679 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2680 timevar_pop (TV_JUMP);
2682 scope_to_insns_initialize ();
2683 /* Complete generation of exception handling code. */
2686 timevar_push (TV_JUMP);
2687 open_dump_file (DFI_eh, decl);
2689 finish_eh_generation ();
2691 close_dump_file (DFI_eh, print_rtl, get_insns ());
2692 timevar_pop (TV_JUMP);
2695 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2696 generation, which might create new sets. */
2697 emit_initial_value_sets ();
2700 /* If we are doing position-independent code generation, now
2701 is the time to output special prologues and epilogues.
2702 We do not want to do this earlier, because it just clutters
2703 up inline functions with meaningless insns. */
2708 insns = get_insns ();
2710 /* Copy any shared structure that should not be shared. */
2711 unshare_all_rtl (current_function_decl, insns);
2713 #ifdef SETJMP_VIA_SAVE_AREA
2714 /* This must be performed before virtual register instantiation.
2715 Please be aware the everything in the compiler that can look
2716 at the RTL up to this point must understand that REG_SAVE_AREA
2717 is just like a use of the REG contained inside. */
2718 if (current_function_calls_alloca)
2719 optimize_save_area_alloca (insns);
2722 /* Instantiate all virtual registers. */
2723 instantiate_virtual_regs (current_function_decl, insns);
2725 open_dump_file (DFI_jump, decl);
2727 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2728 are initialized and to compute whether control can drop off the end
2731 timevar_push (TV_JUMP);
2732 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2733 before jump optimization switches branch directions. */
2734 if (flag_guess_branch_prob)
2735 expected_value_to_br_prob ();
2737 reg_scan (insns, max_reg_num (), 0);
2738 rebuild_jump_labels (insns);
2739 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2740 delete_trivially_dead_insns (insns, max_reg_num ());
2742 dump_flow_info (rtl_dump_file);
2743 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2744 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2748 free_bb_for_insn ();
2749 copy_loop_headers (insns);
2750 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2752 purge_line_number_notes (insns);
2754 timevar_pop (TV_JUMP);
2755 close_dump_file (DFI_jump, print_rtl, insns);
2757 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2758 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2760 goto exit_rest_of_compilation;
2763 /* Long term, this should probably move before the jump optimizer too,
2764 but I didn't want to disturb the rtl_dump_and_exit and related
2765 stuff at this time. */
2766 if (optimize > 0 && flag_ssa)
2768 /* Convert to SSA form. */
2770 timevar_push (TV_TO_SSA);
2771 open_dump_file (DFI_ssa, decl);
2773 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2776 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2777 timevar_pop (TV_TO_SSA);
2779 /* Perform sparse conditional constant propagation, if requested. */
2782 timevar_push (TV_SSA_CCP);
2783 open_dump_file (DFI_ssa_ccp, decl);
2787 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2788 timevar_pop (TV_SSA_CCP);
2791 /* It would be useful to cleanup the CFG at this point, but block
2792 merging and possibly other transformations might leave a PHI
2793 node in the middle of a basic block, which is a strict no-no. */
2795 /* The SSA implementation uses basic block numbers in its phi
2796 nodes. Thus, changing the control-flow graph or the basic
2797 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2798 may cause problems. */
2802 /* Remove dead code. */
2804 timevar_push (TV_SSA_DCE);
2805 open_dump_file (DFI_ssa_dce, decl);
2807 insns = get_insns ();
2808 ssa_eliminate_dead_code ();
2810 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2811 timevar_pop (TV_SSA_DCE);
2814 /* Convert from SSA form. */
2816 timevar_push (TV_FROM_SSA);
2817 open_dump_file (DFI_ussa, decl);
2819 convert_from_ssa ();
2820 /* New registers have been created. Rescan their usage. */
2821 reg_scan (insns, max_reg_num (), 1);
2823 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2824 timevar_pop (TV_FROM_SSA);
2829 timevar_push (TV_JUMP);
2831 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2833 /* Try to identify useless null pointer tests and delete them. */
2834 if (flag_delete_null_pointer_checks)
2836 open_dump_file (DFI_null, decl);
2838 dump_flow_info (rtl_dump_file);
2840 if (delete_null_pointer_checks (insns))
2841 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2843 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2846 /* Jump optimization, and the removal of NULL pointer checks, may
2847 have reduced the number of instructions substantially. CSE, and
2848 future passes, allocate arrays whose dimensions involve the
2849 maximum instruction UID, so if we can reduce the maximum UID
2850 we'll save big on memory. */
2851 renumber_insns (rtl_dump_file);
2852 timevar_pop (TV_JUMP);
2854 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2858 /* Perform common subexpression elimination.
2859 Nonzero value from `cse_main' means that jumps were simplified
2860 and some code may now be unreachable, so do
2861 jump optimization again. */
2865 open_dump_file (DFI_cse, decl);
2867 dump_flow_info (rtl_dump_file);
2868 timevar_push (TV_CSE);
2870 reg_scan (insns, max_reg_num (), 1);
2872 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2874 rebuild_jump_labels (insns);
2875 purge_all_dead_edges (0);
2877 delete_trivially_dead_insns (insns, max_reg_num ());
2879 /* If we are not running more CSE passes, then we are no longer
2880 expecting CSE to be run. But always rerun it in a cheap mode. */
2881 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2883 if (tem || optimize > 1)
2884 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2885 /* Try to identify useless null pointer tests and delete them. */
2886 if (flag_delete_null_pointer_checks)
2888 timevar_push (TV_JUMP);
2890 if (delete_null_pointer_checks (insns))
2891 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2892 timevar_pop (TV_JUMP);
2895 /* The second pass of jump optimization is likely to have
2896 removed a bunch more instructions. */
2897 renumber_insns (rtl_dump_file);
2899 timevar_pop (TV_CSE);
2900 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2903 open_dump_file (DFI_addressof, decl);
2905 purge_addressof (insns);
2907 purge_all_dead_edges (0);
2908 reg_scan (insns, max_reg_num (), 1);
2910 close_dump_file (DFI_addressof, print_rtl, insns);
2914 /* Perform global cse. */
2916 if (optimize > 0 && flag_gcse)
2918 int save_csb, save_cfj;
2921 timevar_push (TV_GCSE);
2922 open_dump_file (DFI_gcse, decl);
2924 tem = gcse_main (insns, rtl_dump_file);
2925 rebuild_jump_labels (insns);
2926 delete_trivially_dead_insns (insns, max_reg_num ());
2928 save_csb = flag_cse_skip_blocks;
2929 save_cfj = flag_cse_follow_jumps;
2930 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2932 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2933 if (current_function_calls_constant_p)
2934 purge_builtin_constant_p ();
2936 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2938 if (flag_expensive_optimizations)
2940 timevar_push (TV_CSE);
2941 reg_scan (insns, max_reg_num (), 1);
2942 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2943 purge_all_dead_edges (0);
2944 delete_trivially_dead_insns (insns, max_reg_num ());
2945 timevar_pop (TV_CSE);
2946 cse_not_expected = !flag_rerun_cse_after_loop;
2949 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2950 things up. Then possibly re-run CSE again. */
2954 timevar_push (TV_JUMP);
2955 rebuild_jump_labels (insns);
2956 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2957 timevar_pop (TV_JUMP);
2959 if (flag_expensive_optimizations)
2961 timevar_push (TV_CSE);
2962 reg_scan (insns, max_reg_num (), 1);
2963 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2964 purge_all_dead_edges (0);
2965 delete_trivially_dead_insns (insns, max_reg_num ());
2966 timevar_pop (TV_CSE);
2970 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2971 timevar_pop (TV_GCSE);
2974 flag_cse_skip_blocks = save_csb;
2975 flag_cse_follow_jumps = save_cfj;
2976 #ifdef ENABLE_CHECKING
2977 verify_flow_info ();
2981 /* Move constant computations out of loops. */
2983 if (optimize > 0 && flag_loop_optimize)
2985 int do_unroll, do_prefetch;
2987 timevar_push (TV_LOOP);
2988 delete_dead_jumptables ();
2989 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2990 open_dump_file (DFI_loop, decl);
2991 /* CFG is no longer maintained up-to-date. */
2992 free_bb_for_insn ();
2994 if (flag_unroll_loops)
2995 do_unroll = 0; /* Having two unrollers is useless. */
2997 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2998 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2999 if (flag_rerun_loop_opt)
3001 cleanup_barriers ();
3003 /* We only want to perform unrolling once. */
3004 loop_optimize (insns, rtl_dump_file, do_unroll);
3007 /* The first call to loop_optimize makes some instructions
3008 trivially dead. We delete those instructions now in the
3009 hope that doing so will make the heuristics in loop work
3010 better and possibly speed up compilation. */
3011 delete_trivially_dead_insns (insns, max_reg_num ());
3013 /* The regscan pass is currently necessary as the alias
3014 analysis code depends on this information. */
3015 reg_scan (insns, max_reg_num (), 1);
3017 cleanup_barriers ();
3018 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3020 /* Loop can create trivially dead instructions. */
3021 delete_trivially_dead_insns (insns, max_reg_num ());
3022 close_dump_file (DFI_loop, print_rtl, insns);
3023 timevar_pop (TV_LOOP);
3024 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3029 /* Perform jump bypassing and control flow optimizations. */
3030 if (optimize > 0 && flag_gcse)
3032 timevar_push (TV_BYPASS);
3033 open_dump_file (DFI_bypass, decl);
3035 cleanup_cfg (CLEANUP_EXPENSIVE);
3036 tem = bypass_jumps (rtl_dump_file);
3040 rebuild_jump_labels (insns);
3041 cleanup_cfg (CLEANUP_EXPENSIVE);
3042 delete_trivially_dead_insns (insns, max_reg_num ());
3045 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
3046 timevar_pop (TV_BYPASS);
3050 #ifdef ENABLE_CHECKING
3051 verify_flow_info ();
3055 /* Do control and data flow analysis; wrote some of the results to
3058 timevar_push (TV_FLOW);
3059 open_dump_file (DFI_cfg, decl);
3061 dump_flow_info (rtl_dump_file);
3063 cleanup_cfg (CLEANUP_EXPENSIVE
3064 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3066 /* It may make more sense to mark constant functions after dead code is
3067 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3068 may insert code making function non-constant, but we still must consider
3069 it as constant, otherwise -fbranch-probabilities will not read data back.
3071 life_analysis rarely eliminates modification of external memory.
3074 mark_constant_function ();
3076 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3078 /* Do branch profiling and static profile estimation passes. */
3079 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3083 timevar_push (TV_BRANCH_PROB);
3084 open_dump_file (DFI_bp, decl);
3085 if (cfun->arc_profile || flag_branch_probabilities)
3088 /* Discover and record the loop depth at the head of each basic
3089 block. The loop infrastructure does the real job for us. */
3090 flow_loops_find (&loops, LOOP_TREE);
3093 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3095 /* Estimate using heuristics if no profiling info is available. */
3096 if (flag_guess_branch_prob)
3097 estimate_probability (&loops);
3099 flow_loops_free (&loops);
3100 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3101 timevar_pop (TV_BRANCH_PROB);
3105 open_dump_file (DFI_ce1, decl);
3106 if (flag_if_conversion)
3108 timevar_push (TV_IFCVT);
3110 dump_flow_info (rtl_dump_file);
3111 cleanup_cfg (CLEANUP_EXPENSIVE);
3112 reg_scan (insns, max_reg_num (), 0);
3114 timevar_pop (TV_IFCVT);
3116 timevar_push (TV_JUMP);
3117 cleanup_cfg (CLEANUP_EXPENSIVE);
3118 reg_scan (insns, max_reg_num (), 0);
3119 timevar_pop (TV_JUMP);
3120 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3124 timevar_push (TV_TRACER);
3125 open_dump_file (DFI_tracer, decl);
3127 dump_flow_info (rtl_dump_file);
3129 cleanup_cfg (CLEANUP_EXPENSIVE);
3130 reg_scan (insns, max_reg_num (), 0);
3131 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3132 timevar_pop (TV_TRACER);
3135 /* Perform loop optimalizations. It might be better to do them a bit
3136 sooner, but we want the profile feedback to work more efficiently. */
3138 && (flag_unswitch_loops
3140 || flag_unroll_loops))
3142 struct loops *loops;
3143 timevar_push (TV_LOOP);
3144 open_dump_file (DFI_loop2, decl);
3146 dump_flow_info (rtl_dump_file);
3148 loops = loop_optimizer_init (rtl_dump_file);
3152 /* The optimalizations: */
3153 if (flag_unswitch_loops)
3154 unswitch_loops (loops);
3156 if (flag_peel_loops || flag_unroll_loops)
3157 unroll_and_peel_loops (loops,
3158 (flag_peel_loops ? UAP_PEEL : 0) |
3159 (flag_unroll_loops ? UAP_UNROLL : 0) |
3160 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3162 loop_optimizer_finalize (loops, rtl_dump_file);
3165 cleanup_cfg (CLEANUP_EXPENSIVE);
3166 delete_trivially_dead_insns (insns, max_reg_num ());
3167 reg_scan (insns, max_reg_num (), 0);
3169 dump_flow_info (rtl_dump_file);
3170 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3171 timevar_pop (TV_LOOP);
3175 if (flag_rerun_cse_after_loop)
3177 timevar_push (TV_CSE2);
3178 open_dump_file (DFI_cse2, decl);
3180 dump_flow_info (rtl_dump_file);
3181 /* CFG is no longer maintained up-to-date. */
3182 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3183 purge_all_dead_edges (0);
3184 delete_trivially_dead_insns (insns, max_reg_num ());
3188 timevar_push (TV_JUMP);
3189 rebuild_jump_labels (insns);
3190 cleanup_cfg (CLEANUP_EXPENSIVE);
3191 timevar_pop (TV_JUMP);
3193 reg_scan (insns, max_reg_num (), 0);
3194 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3196 timevar_pop (TV_CSE2);
3199 cse_not_expected = 1;
3201 open_dump_file (DFI_life, decl);
3204 #ifdef ENABLE_CHECKING
3205 verify_flow_info ();
3207 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3209 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3210 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3211 timevar_pop (TV_FLOW);
3215 if (warn_uninitialized || extra_warnings)
3217 uninitialized_vars_warning (DECL_INITIAL (decl));
3219 setjmp_args_warning ();
3225 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3227 /* Insns were inserted, so things might look a bit different. */
3228 insns = get_insns ();
3229 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3230 PROP_LOG_LINKS | PROP_REG_INFO
3231 | PROP_DEATH_NOTES);
3235 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3239 /* If -opt, try combining insns through substitution. */
3243 int rebuild_jump_labels_after_combine = 0;
3245 timevar_push (TV_COMBINE);
3246 open_dump_file (DFI_combine, decl);
3248 rebuild_jump_labels_after_combine
3249 = combine_instructions (insns, max_reg_num ());
3251 /* Combining insns may have turned an indirect jump into a
3252 direct jump. Rebuild the JUMP_LABEL fields of jumping
3254 if (rebuild_jump_labels_after_combine)
3256 timevar_push (TV_JUMP);
3257 rebuild_jump_labels (insns);
3258 timevar_pop (TV_JUMP);
3260 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3263 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3264 timevar_pop (TV_COMBINE);
3269 /* Rerun if-conversion, as combine may have simplified things enough to
3270 now meet sequence length restrictions. */
3271 if (flag_if_conversion)
3273 timevar_push (TV_IFCVT);
3274 open_dump_file (DFI_ce2, decl);
3280 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3281 timevar_pop (TV_IFCVT);
3284 /* Register allocation pre-pass, to reduce number of moves
3285 necessary for two-address machines. */
3286 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3288 timevar_push (TV_REGMOVE);
3289 open_dump_file (DFI_regmove, decl);
3291 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3293 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3294 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3295 timevar_pop (TV_REGMOVE);
3300 /* Do unconditional splitting before register allocation to allow machine
3301 description to add extra information not needed previously. */
3302 split_all_insns (1);
3304 #ifdef OPTIMIZE_MODE_SWITCHING
3305 timevar_push (TV_MODE_SWITCH);
3308 optimize_mode_switching (NULL);
3311 timevar_pop (TV_MODE_SWITCH);
3314 /* Any of the several passes since flow1 will have munged register
3315 lifetime data a bit. We need it to be up to date for scheduling
3316 (see handling of reg_known_equiv in init_alias_analysis). */
3317 recompute_reg_usage (insns, !optimize_size);
3319 timevar_push (TV_SCHED);
3321 #ifdef INSN_SCHEDULING
3323 /* Print function header into sched dump now
3324 because doing the sched analysis makes some of the dump. */
3325 if (optimize > 0 && flag_schedule_insns)
3327 open_dump_file (DFI_sched, decl);
3329 /* Do control and data sched analysis,
3330 and write some of the results to dump file. */
3332 schedule_insns (rtl_dump_file);
3334 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3337 timevar_pop (TV_SCHED);
3341 /* Determine if the current function is a leaf before running reload
3342 since this can impact optimizations done by the prologue and
3343 epilogue thus changing register elimination offsets. */
3344 current_function_is_leaf = leaf_function_p ();
3346 timevar_push (TV_LOCAL_ALLOC);
3347 open_dump_file (DFI_lreg, decl);
3349 /* Allocate pseudo-regs that are used only within 1 basic block.
3351 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3352 jump optimizer after register allocation and reloading are finished. */
3354 if (flag_new_regalloc)
3356 delete_trivially_dead_insns (insns, max_reg_num ());
3359 timevar_pop (TV_LOCAL_ALLOC);
3360 if (dump_file[DFI_lreg].enabled)
3362 timevar_push (TV_DUMP);
3364 close_dump_file (DFI_lreg, NULL, NULL);
3365 timevar_pop (TV_DUMP);
3368 /* XXX clean up the whole mess to bring live info in shape again. */
3369 timevar_push (TV_GLOBAL_ALLOC);
3370 open_dump_file (DFI_greg, decl);
3372 build_insn_chain (insns);
3373 failure = reload (insns, 0);
3375 timevar_pop (TV_GLOBAL_ALLOC);
3377 if (dump_file[DFI_greg].enabled)
3379 timevar_push (TV_DUMP);
3381 dump_global_regs (rtl_dump_file);
3383 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3384 timevar_pop (TV_DUMP);
3388 goto exit_rest_of_compilation;
3389 reload_completed = 1;
3390 rebuild_label_notes_after_reload = 0;
3394 /* Allocate the reg_renumber array. */
3395 allocate_reg_info (max_regno, FALSE, TRUE);
3397 /* And the reg_equiv_memory_loc array. */
3398 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3400 allocate_initial_values (reg_equiv_memory_loc);
3402 regclass (insns, max_reg_num (), rtl_dump_file);
3403 rebuild_label_notes_after_reload = local_alloc ();
3405 timevar_pop (TV_LOCAL_ALLOC);
3407 if (dump_file[DFI_lreg].enabled)
3409 timevar_push (TV_DUMP);
3411 dump_flow_info (rtl_dump_file);
3412 dump_local_alloc (rtl_dump_file);
3414 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3415 timevar_pop (TV_DUMP);
3420 timevar_push (TV_GLOBAL_ALLOC);
3421 open_dump_file (DFI_greg, decl);
3423 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3424 pass fixing up any insns that are invalid. */
3427 failure = global_alloc (rtl_dump_file);
3430 build_insn_chain (insns);
3431 failure = reload (insns, 0);
3434 timevar_pop (TV_GLOBAL_ALLOC);
3436 if (dump_file[DFI_greg].enabled)
3438 timevar_push (TV_DUMP);
3440 dump_global_regs (rtl_dump_file);
3442 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3443 timevar_pop (TV_DUMP);
3447 goto exit_rest_of_compilation;
3452 open_dump_file (DFI_postreload, decl);
3454 /* Do a very simple CSE pass over just the hard registers. */
3457 timevar_push (TV_RELOAD_CSE_REGS);
3458 reload_cse_regs (insns);
3459 timevar_pop (TV_RELOAD_CSE_REGS);
3462 /* Register allocation and reloading may have turned an indirect jump into
3463 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3464 jumping instructions. */
3465 if (rebuild_label_notes_after_reload)
3467 timevar_push (TV_JUMP);
3469 rebuild_jump_labels (insns);
3470 purge_all_dead_edges (0);
3472 timevar_pop (TV_JUMP);
3475 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3477 /* Re-create the death notes which were deleted during reload. */
3478 timevar_push (TV_FLOW2);
3479 open_dump_file (DFI_flow2, decl);
3481 #ifdef ENABLE_CHECKING
3482 verify_flow_info ();
3485 /* If optimizing, then go ahead and split insns now. */
3489 split_all_insns (0);
3492 cleanup_cfg (CLEANUP_EXPENSIVE);
3494 /* On some machines, the prologue and epilogue code, or parts thereof,
3495 can be represented as RTL. Doing so lets us schedule insns between
3496 it and the rest of the code and also allows delayed branch
3497 scheduling to operate in the epilogue. */
3498 thread_prologue_and_epilogue_insns (insns);
3502 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3503 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3504 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3506 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3507 even for machines with possibly nonzero RETURN_POPS_ARGS
3508 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3509 push instructions will have popping returns. */
3510 #ifndef PUSH_ROUNDING
3511 if (!ACCUMULATE_OUTGOING_ARGS)
3513 combine_stack_adjustments ();
3518 flow2_completed = 1;
3520 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3521 timevar_pop (TV_FLOW2);
3523 #ifdef HAVE_peephole2
3524 if (optimize > 0 && flag_peephole2)
3526 timevar_push (TV_PEEPHOLE2);
3527 open_dump_file (DFI_peephole2, decl);
3529 peephole2_optimize (rtl_dump_file);
3531 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3532 timevar_pop (TV_PEEPHOLE2);
3536 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3538 timevar_push (TV_RENAME_REGISTERS);
3539 open_dump_file (DFI_rnreg, decl);
3541 if (flag_rename_registers)
3542 regrename_optimize ();
3543 if (flag_cprop_registers)
3544 copyprop_hardreg_forward ();
3546 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3547 timevar_pop (TV_RENAME_REGISTERS);
3552 timevar_push (TV_REORDER_BLOCKS);
3553 open_dump_file (DFI_bbro, decl);
3555 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3556 splitting possibly introduced more crossjumping opportunities. */
3557 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3558 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3560 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
3562 if (flag_reorder_blocks)
3563 reorder_basic_blocks ();
3564 if (flag_reorder_blocks
3565 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
3566 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3568 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3569 timevar_pop (TV_REORDER_BLOCKS);
3572 if (flag_if_conversion2)
3574 timevar_push (TV_IFCVT2);
3575 open_dump_file (DFI_ce3, decl);
3579 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3580 timevar_pop (TV_IFCVT2);
3583 #ifdef INSN_SCHEDULING
3584 if (optimize > 0 && flag_schedule_insns_after_reload)
3586 timevar_push (TV_SCHED2);
3587 open_dump_file (DFI_sched2, decl);
3589 /* Do control and data sched analysis again,
3590 and write some more of the results to dump file. */
3592 split_all_insns (1);
3594 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
3596 schedule_ebbs (rtl_dump_file);
3597 /* No liveness updating code yet, but it should be easy to do.
3598 reg-stack recompute the liveness when needed for now. */
3599 count_or_remove_death_notes (NULL, 1);
3600 cleanup_cfg (CLEANUP_EXPENSIVE);
3603 schedule_insns (rtl_dump_file);
3605 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3606 timevar_pop (TV_SCHED2);
3612 #ifdef LEAF_REGISTERS
3613 current_function_uses_only_leaf_regs
3614 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3618 timevar_push (TV_REG_STACK);
3619 open_dump_file (DFI_stack, decl);
3621 if (reg_to_stack (insns, rtl_dump_file) && optimize)
3623 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3624 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
3625 && flag_reorder_blocks)
3627 reorder_basic_blocks ();
3628 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3632 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3633 timevar_pop (TV_REG_STACK);
3637 compute_alignments ();
3639 /* CFG is no longer maintained up-to-date. */
3640 free_bb_for_insn ();
3642 /* If a machine dependent reorganization is needed, call it. */
3643 #ifdef MACHINE_DEPENDENT_REORG
3644 timevar_push (TV_MACH_DEP);
3645 open_dump_file (DFI_mach, decl);
3647 MACHINE_DEPENDENT_REORG (insns);
3649 close_dump_file (DFI_mach, print_rtl, insns);
3650 timevar_pop (TV_MACH_DEP);
3655 purge_line_number_notes (insns);
3656 cleanup_barriers ();
3658 /* If a scheduling pass for delayed branches is to be done,
3659 call the scheduling code. */
3662 if (optimize > 0 && flag_delayed_branch)
3664 timevar_push (TV_DBR_SCHED);
3665 open_dump_file (DFI_dbr, decl);
3667 dbr_schedule (insns, rtl_dump_file);
3669 close_dump_file (DFI_dbr, print_rtl, insns);
3670 timevar_pop (TV_DBR_SCHED);
3676 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3677 timevar_push (TV_SHORTEN_BRANCH);
3678 split_all_insns_noflow ();
3679 timevar_pop (TV_SHORTEN_BRANCH);
3682 convert_to_eh_region_ranges ();
3684 /* Shorten branches. */
3685 timevar_push (TV_SHORTEN_BRANCH);
3686 shorten_branches (get_insns ());
3687 timevar_pop (TV_SHORTEN_BRANCH);
3689 set_nothrow_function_flags ();
3690 if (current_function_nothrow)
3691 /* Now we know that this can't throw; set the flag for the benefit
3692 of other functions later in this translation unit. */
3693 TREE_NOTHROW (current_function_decl) = 1;
3695 /* Now turn the rtl into assembler code. */
3697 timevar_push (TV_FINAL);
3702 /* Get the function's name, as described by its RTL. This may be
3703 different from the DECL_NAME name used in the source file. */
3705 x = DECL_RTL (decl);
3706 if (GET_CODE (x) != MEM)
3709 if (GET_CODE (x) != SYMBOL_REF)
3711 fnname = XSTR (x, 0);
3713 assemble_start_function (decl, fnname);
3714 final_start_function (insns, asm_out_file, optimize);
3715 final (insns, asm_out_file, optimize, 0);
3716 final_end_function ();
3718 #ifdef IA64_UNWIND_INFO
3719 /* ??? The IA-64 ".handlerdata" directive must be issued before
3720 the ".endp" directive that closes the procedure descriptor. */
3721 output_function_exception_table ();
3724 assemble_end_function (decl, fnname);
3726 #ifndef IA64_UNWIND_INFO
3727 /* Otherwise, it feels unclean to switch sections in the middle. */
3728 output_function_exception_table ();
3732 fflush (asm_out_file);
3734 /* Release all memory allocated by flow. */
3735 free_basic_block_vars (0);
3737 /* Release all memory held by regsets now. */
3738 regset_release_memory ();
3740 timevar_pop (TV_FINAL);
3744 /* Write DBX symbols if requested. */
3746 /* Note that for those inline functions where we don't initially
3747 know for certain that we will be generating an out-of-line copy,
3748 the first invocation of this routine (rest_of_compilation) will
3749 skip over this code by doing a `goto exit_rest_of_compilation;'.
3750 Later on, wrapup_global_declarations will (indirectly) call
3751 rest_of_compilation again for those inline functions that need
3752 to have out-of-line copies generated. During that call, we
3753 *will* be routed past here. */
3755 timevar_push (TV_SYMOUT);
3756 (*debug_hooks->function_decl) (decl);
3757 timevar_pop (TV_SYMOUT);
3759 exit_rest_of_compilation:
3761 /* In case the function was not output,
3762 don't leave any temporary anonymous types
3763 queued up for sdb output. */
3764 #ifdef SDB_DEBUGGING_INFO
3765 if (write_symbols == SDB_DEBUG)
3766 sdbout_types (NULL_TREE);
3769 reload_completed = 0;
3770 flow2_completed = 0;
3773 timevar_push (TV_FINAL);
3775 /* Clear out the insn_length contents now that they are no
3777 init_insn_lengths ();
3779 /* Show no temporary slots allocated. */
3782 free_basic_block_vars (0);
3783 free_bb_for_insn ();
3785 timevar_pop (TV_FINAL);
3787 if ((*targetm.binds_local_p) (current_function_decl))
3789 int pref = cfun->preferred_stack_boundary;
3790 if (cfun->recursive_call_emit
3791 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3792 pref = cfun->stack_alignment_needed;
3793 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3797 /* Make sure volatile mem refs aren't considered valid operands for
3798 arithmetic insns. We must call this here if this is a nested inline
3799 function, since the above code leaves us in the init_recog state
3800 (from final.c), and the function context push/pop code does not
3801 save/restore volatile_ok.
3803 ??? Maybe it isn't necessary for expand_start_function to call this
3804 anymore if we do it here? */
3806 init_recog_no_volatile ();
3808 /* We're done with this function. Free up memory if we can. */
3809 free_after_parsing (cfun);
3810 if (! DECL_DEFER_OUTPUT (decl))
3812 free_after_compilation (cfun);
3814 /* Clear integrate.c's pointer to the cfun structure we just
3816 DECL_SAVED_INSNS (decl) = 0;
3822 timevar_pop (TV_REST_OF_COMPILATION);
3832 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3833 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3834 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3835 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3836 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3837 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"));
3838 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3840 for (i = ARRAY_SIZE (f_options); i--;)
3842 const char *description = f_options[i].description;
3844 if (description != NULL && *description != 0)
3845 printf (" -f%-21s %s\n",
3846 f_options[i].string, _(description));
3849 printf (_(" -O[number] Set optimization level to [number]\n"));
3850 printf (_(" -Os Optimize for space rather than speed\n"));
3851 for (i = LAST_PARAM; i--;)
3853 const char *description = compiler_params[i].help;
3854 const int length = 21 - strlen (compiler_params[i].option);
3856 if (description != NULL && *description != 0)
3857 printf (" --param %s=<value>%.*s%s\n",
3858 compiler_params[i].option,
3859 length > 0 ? length : 1, " ",
3862 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3863 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3864 printf (_(" -w Suppress warnings\n"));
3866 for (i = ARRAY_SIZE (W_options); i--;)
3868 const char *description = W_options[i].description;
3870 if (description != NULL && *description != 0)
3871 printf (" -W%-21s %s\n",
3872 W_options[i].string, _(description));
3875 printf (_(" -Wunused Enable unused warnings\n"));
3876 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3877 printf (_(" -p Enable function profiling\n"));
3878 printf (_(" -o <file> Place output into <file> \n"));
3880 -G <number> Put global and static data smaller than <number>\n\
3881 bytes into a special section (on some targets)\n"));
3883 for (i = ARRAY_SIZE (debug_args); i--;)
3885 if (debug_args[i].description != NULL)
3886 printf (" -g%-21s %s\n",
3887 debug_args[i].arg, _(debug_args[i].description));
3890 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3891 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3892 printf (_(" -version Display the compiler's version\n"));
3893 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3894 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3895 #if defined INSN_SCHEDULING
3896 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3898 printf (_(" --help Display this information\n"));
3903 /* Display descriptions of language specific options.
3904 If there is no description, note that there is an undocumented option.
3905 If the description is empty, do not display anything. (This allows
3906 options to be deliberately undocumented, for whatever reason).
3907 If the option string is missing, then this is a marker, indicating
3908 that the description string is in fact the name of a language, whose
3909 language specific options are to follow. */
3911 if (ARRAY_SIZE (documented_lang_options) > 1)
3913 printf (_("\nLanguage specific options:\n"));
3915 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3917 const char *description = documented_lang_options[i].description;
3918 const char *option = documented_lang_options[i].option;
3920 if (description == NULL)
3925 printf (_(" %-23.23s [undocumented]\n"), option);
3927 else if (*description == 0)
3929 else if (option == NULL)
3933 (_("\nThere are undocumented %s specific options as well.\n"),
3937 printf (_("\n Options for %s:\n"), description);
3942 printf (" %-23.23s %s\n", option, _(description));
3947 printf (_("\nThere are undocumented %s specific options as well.\n"),
3950 display_target_options ();
3954 display_target_options ()
3957 static bool displayed = false;
3959 /* Avoid double printing for --help --target-help. */
3964 if (ARRAY_SIZE (target_switches) > 1
3965 #ifdef TARGET_OPTIONS
3966 || ARRAY_SIZE (target_options) > 1
3974 printf (_("\nTarget specific options:\n"));
3976 for (i = ARRAY_SIZE (target_switches); i--;)
3978 const char *option = target_switches[i].name;
3979 const char *description = target_switches[i].description;
3981 if (option == NULL || *option == 0)
3983 else if (description == NULL)
3988 printf (_(" -m%-23.23s [undocumented]\n"), option);
3990 else if (*description != 0)
3991 doc += printf (" -m%-23.23s %s\n", option, _(description));
3994 #ifdef TARGET_OPTIONS
3995 for (i = ARRAY_SIZE (target_options); i--;)
3997 const char *option = target_options[i].prefix;
3998 const char *description = target_options[i].description;
4000 if (option == NULL || *option == 0)
4002 else if (description == NULL)
4007 printf (_(" -m%-23.23s [undocumented]\n"), option);
4009 else if (*description != 0)
4010 doc += printf (" -m%-23.23s %s\n", option, _(description));
4016 printf (_("\nThere are undocumented target specific options as well.\n"));
4018 printf (_(" They exist, but they are not documented.\n"));
4023 /* Parse a -d... command line switch. */
4026 decode_d_option (arg)
4035 for (i = 0; i < (int) DFI_MAX; ++i)
4036 dump_file[i].enabled = 1;
4042 flag_print_asm_name = 1;
4045 flag_dump_rtl_in_asm = 1;
4046 flag_print_asm_name = 1;
4049 graph_dump_format = vcg;
4052 rtl_dump_and_exit = 1;
4057 case 'D': /* These are handled by the preprocessor. */
4061 setup_core_dumping();
4066 for (i = 0; i < (int) DFI_MAX; ++i)
4067 if (c == dump_file[i].debug_switch)
4069 dump_file[i].enabled = 1;
4074 warning ("unrecognized gcc debugging option: %c", c);
4079 /* Parse a -f... command line switch. ARG is the value after the -f.
4080 It is safe to access 'ARG - 2' to generate the full switch name.
4081 Return the number of strings consumed. */
4084 decode_f_option (arg)
4088 const char *option_value = NULL;
4090 /* Search for the option in the table of binary f options. */
4091 for (j = ARRAY_SIZE (f_options); j--;)
4093 if (!strcmp (arg, f_options[j].string))
4095 *f_options[j].variable = f_options[j].on_value;
4099 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4100 && ! strcmp (arg + 3, f_options[j].string))
4102 *f_options[j].variable = ! f_options[j].on_value;
4107 if (!strcmp (arg, "fast-math"))
4108 set_fast_math_flags (1);
4109 else if (!strcmp (arg, "no-fast-math"))
4110 set_fast_math_flags (0);
4111 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4112 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4115 read_integral_parameter (option_value, arg - 2,
4117 set_param_value ("max-inline-insns", val);
4118 set_param_value ("max-inline-insns-single", val/2);
4119 set_param_value ("max-inline-insns-auto", val/2);
4120 set_param_value ("max-inline-insns-rtl", val);
4121 if (val/4 < MIN_INLINE_INSNS)
4124 set_param_value ("min-inline-insns", val/4);
4126 set_param_value ("min-inline-insns", 10);
4129 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4131 if (strcmp (option_value, "global-dynamic") == 0)
4132 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4133 else if (strcmp (option_value, "local-dynamic") == 0)
4134 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4135 else if (strcmp (option_value, "initial-exec") == 0)
4136 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4137 else if (strcmp (option_value, "local-exec") == 0)
4138 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4140 warning ("`%s': unknown tls-model option", arg - 2);
4142 #ifdef INSN_SCHEDULING
4143 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4144 fix_sched_param ("verbose", option_value);
4146 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4147 fix_register (option_value, 1, 1);
4148 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4149 fix_register (option_value, 0, 1);
4150 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4151 fix_register (option_value, 0, 0);
4152 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4153 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4154 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4156 = read_integral_parameter (option_value, arg - 2, align_functions);
4157 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4158 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4159 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4161 = read_integral_parameter (option_value, arg - 2, align_labels);
4162 else if ((option_value
4163 = skip_leading_substring (arg, "stack-limit-register=")))
4165 int reg = decode_reg_name (option_value);
4167 error ("unrecognized register name `%s'", option_value);
4169 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4171 else if ((option_value
4172 = skip_leading_substring (arg, "stack-limit-symbol=")))
4175 nm = ggc_strdup (option_value);
4176 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4178 else if ((option_value
4179 = skip_leading_substring (arg, "message-length=")))
4180 output_set_maximum_length
4181 (&global_dc->buffer, read_integral_parameter
4182 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4183 else if ((option_value
4184 = skip_leading_substring (arg, "diagnostics-show-location=")))
4186 if (!strcmp (option_value, "once"))
4187 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4188 else if (!strcmp (option_value, "every-line"))
4189 diagnostic_prefixing_rule (global_dc)
4190 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4192 error ("unrecognized option `%s'", arg - 2);
4194 else if (!strcmp (arg, "no-stack-limit"))
4195 stack_limit_rtx = NULL_RTX;
4196 else if (!strcmp (arg, "preprocessed"))
4197 /* Recognize this switch but do nothing. This prevents warnings
4198 about an unrecognized switch if cpplib has not been linked in. */
4206 /* Parse a -W... command line switch. ARG is the value after the -W.
4207 It is safe to access 'ARG - 2' to generate the full switch name.
4208 Return the number of strings consumed. */
4211 decode_W_option (arg)
4214 const char *option_value = NULL;
4217 /* Search for the option in the table of binary W options. */
4219 for (j = ARRAY_SIZE (W_options); j--;)
4221 if (!strcmp (arg, W_options[j].string))
4223 *W_options[j].variable = W_options[j].on_value;
4227 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4228 && ! strcmp (arg + 3, W_options[j].string))
4230 *W_options[j].variable = ! W_options[j].on_value;
4235 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4236 warning ("-Wid-clash-LEN is no longer supported");
4237 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4239 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4241 warn_larger_than = larger_than_size != -1;
4243 else if (!strcmp (arg, "unused"))
4247 else if (!strcmp (arg, "no-unused"))
4251 else if (!strcmp (arg, "extra"))
4253 /* We save the value of warn_uninitialized, since if they put
4254 -Wuninitialized on the command line, we need to generate a
4255 warning about not using it without also specifying -O. */
4256 if (warn_uninitialized != 1)
4257 warn_uninitialized = 2;
4265 /* Parse a -g... command line switch. ARG is the value after the -g.
4266 It is safe to access 'ARG - 2' to generate the full switch name.
4267 Return the number of strings consumed. */
4270 decode_g_option (arg)
4273 static unsigned level = 0;
4274 /* A lot of code assumes write_symbols == NO_DEBUG if the
4275 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4276 of what debugging type has been selected). This records the
4277 selected type. It is an error to specify more than one
4279 static enum debug_info_type selected_debug_type = NO_DEBUG;
4280 /* Nonzero if debugging format has been explicitly set.
4281 -g and -ggdb don't explicitly set the debugging format so
4282 -gdwarf -g3 is equivalent to -gdwarf3. */
4283 static int type_explicitly_set_p = 0;
4284 /* Indexed by enum debug_info_type. */
4285 static const char *const debug_type_names[] =
4287 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4290 /* The maximum admissible debug level value. */
4291 static const unsigned max_debug_level = 3;
4293 /* Look up ARG in the table. */
4294 for (da = debug_args; da->arg; da++)
4296 const int da_len = strlen (da->arg);
4298 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4300 enum debug_info_type type = da->debug_type;
4301 const char *p = arg + da_len;
4303 if (*p && ! ISDIGIT (*p))
4306 /* A debug flag without a level defaults to level 2.
4307 Note we do not want to call read_integral_parameter
4308 for that case since it will call atoi which
4311 ??? We may want to generalize the interface to
4312 read_integral_parameter to better handle this case
4313 if this case shows up often. */
4315 level = read_integral_parameter (p, 0, max_debug_level + 1);
4317 level = (level == 0) ? 2 : level;
4319 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4321 error ("use -gdwarf -g%d for DWARF v1, level %d",
4324 error ("use -gdwarf-2 for DWARF v2");
4327 if (level > max_debug_level)
4330 ignoring option `%s' due to invalid debug level specification",
4332 level = debug_info_level;
4335 if (type == NO_DEBUG)
4337 type = PREFERRED_DEBUGGING_TYPE;
4339 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4341 #ifdef DWARF2_DEBUGGING_INFO
4342 type = DWARF2_DEBUG;
4344 #ifdef DBX_DEBUGGING_INFO
4351 if (type == NO_DEBUG)
4352 warning ("`%s': unknown or unsupported -g option", arg - 2);
4354 /* Does it conflict with an already selected type? */
4355 if (type_explicitly_set_p
4356 /* -g/-ggdb don't conflict with anything. */
4357 && da->debug_type != NO_DEBUG
4358 && type != selected_debug_type)
4359 warning ("`%s' ignored, conflicts with `-g%s'",
4360 arg - 2, debug_type_names[(int) selected_debug_type]);
4363 /* If the format has already been set, -g/-ggdb
4364 only change the debug level. */
4365 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4366 /* Don't change debugging type. */
4370 selected_debug_type = type;
4371 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4374 write_symbols = (level == 0
4376 : selected_debug_type);
4377 use_gnu_debug_info_extensions = da->use_extensions_p;
4378 debug_info_level = (enum debug_info_level) level;
4391 /* Decode the first argument in the argv as a language-independent option.
4392 Return the number of strings consumed. */
4395 independent_decode_option (argc, argv)
4399 char *arg = argv[0];
4401 if (arg[0] != '-' || arg[1] == 0)
4413 if (!strcmp (arg, "-help"))
4416 exit_after_options = 1;
4420 if (!strcmp (arg, "-target-help"))
4422 display_target_options ();
4423 exit_after_options = 1;
4427 if (!strcmp (arg, "-version"))
4429 print_version (stderr, "");
4430 exit_after_options = 1;
4434 /* Handle '--param <name>=<value>'. */
4435 if (strcmp (arg, "-param") == 0)
4441 error ("-param option missing argument");
4445 /* Get the '<name>=<value>' parameter. */
4447 /* Look for the `='. */
4448 equal = strchr (arg, '=');
4450 error ("invalid --param option: %s", arg);
4455 /* Zero out the `=' sign so that we get two separate strings. */
4457 /* Figure out what value is specified. */
4458 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4459 if (val != INVALID_PARAM_VAL)
4460 set_param_value (arg, val);
4462 error ("invalid parameter value `%s'", equal + 1);
4474 /* Already been treated in main (). Do nothing. */
4478 set_target_switch (arg + 1);
4482 return decode_f_option (arg + 1);
4485 return decode_g_option (arg + 1);
4488 if (!strcmp (arg, "dumpbase"))
4494 dump_base_name = argv[1];
4499 decode_d_option (arg + 1);
4503 if (!strcmp (arg, "pedantic"))
4505 else if (!strcmp (arg, "pedantic-errors"))
4506 flag_pedantic_errors = pedantic = 1;
4507 else if (arg[1] == 0)
4514 if (!strcmp (arg, "quiet"))
4521 if (!strcmp (arg, "version"))
4529 inhibit_warnings = 1;
4538 /* We save the value of warn_uninitialized, since if they put
4539 -Wuninitialized on the command line, we need to generate a
4540 warning about not using it without also specifying -O. */
4541 if (warn_uninitialized != 1)
4542 warn_uninitialized = 2;
4545 return decode_W_option (arg + 1);
4549 if (!strncmp (arg, "aux-info", 8))
4556 aux_info_file_name = argv[1];
4557 flag_gen_aux_info = 1;
4560 else if (arg[8] == '=')
4562 aux_info_file_name = arg + 9;
4563 flag_gen_aux_info = 1;
4568 else if (!strcmp (arg, "auxbase"))
4574 aux_base_name = argv[1];
4578 else if (!strcmp (arg, "auxbase-strip"))
4585 strip_off_ending (argv[1], strlen (argv[1]));
4587 aux_base_name = argv[1];
4602 asm_file_name = argv[1];
4617 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4622 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4626 if (g_switch_val == -1)
4630 g_switch_set = TRUE;
4631 g_switch_value = g_switch_val;
4641 /* Decode -m switches. */
4642 /* Decode the switch -mNAME. */
4645 set_target_switch (name)
4649 int valid_target_option = 0;
4651 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4652 if (!strcmp (target_switches[j].name, name))
4654 if (target_switches[j].value < 0)
4655 target_flags &= ~-target_switches[j].value;
4657 target_flags |= target_switches[j].value;
4660 if (target_switches[j].value < 0)
4661 target_flags_explicit |= -target_switches[j].value;
4663 target_flags_explicit |= target_switches[j].value;
4665 valid_target_option = 1;
4668 #ifdef TARGET_OPTIONS
4669 if (!valid_target_option)
4670 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4672 int len = strlen (target_options[j].prefix);
4673 if (!strncmp (target_options[j].prefix, name, len))
4675 *target_options[j].variable = name + len;
4676 valid_target_option = 1;
4681 if (!valid_target_option)
4682 error ("invalid option `%s'", name);
4685 /* Print version information to FILE.
4686 Each line begins with INDENT (for the case where FILE is the
4687 assembler output file). */
4690 print_version (file, indent)
4695 #define __VERSION__ "[?]"
4699 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4701 "%s%s%s version %s (%s) compiled by CC.\n"
4703 , indent, *indent != 0 ? " " : "",
4704 lang_hooks.name, version_string, TARGET_NAME,
4705 indent, __VERSION__);
4706 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4707 indent, *indent != 0 ? " " : "",
4708 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4711 /* Print an option value and return the adjusted position in the line.
4712 ??? We don't handle error returns from fprintf (disk full); presumably
4713 other code will catch a disk full though. */
4716 print_single_switch (file, pos, max, indent, sep, term, type, name)
4719 const char *indent, *sep, *term, *type, *name;
4721 /* The ultrix fprintf returns 0 on success, so compute the result we want
4722 here since we need it for the following test. */
4723 int len = strlen (sep) + strlen (type) + strlen (name);
4728 fprintf (file, "%s", term);
4733 fprintf (file, "%s", indent);
4734 pos = strlen (indent);
4736 fprintf (file, "%s%s%s", sep, type, name);
4741 /* Print active target switches to FILE.
4742 POS is the current cursor position and MAX is the size of a "line".
4743 Each line begins with INDENT and ends with TERM.
4744 Each switch is separated from the next by SEP. */
4747 print_switch_values (file, pos, max, indent, sep, term)
4750 const char *indent, *sep, *term;
4755 /* Print the options as passed. */
4757 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4758 _("options passed: "), "");
4760 for (p = &save_argv[1]; *p != NULL; p++)
4764 if (strcmp (*p, "-o") == 0)
4770 if (strcmp (*p, "-quiet") == 0)
4772 if (strcmp (*p, "-version") == 0)
4777 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4780 fprintf (file, "%s", term);
4782 /* Print the -f and -m options that have been enabled.
4783 We don't handle language specific options but printing argv
4786 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4787 _("options enabled: "), "");
4789 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4790 if (*f_options[j].variable == f_options[j].on_value)
4791 pos = print_single_switch (file, pos, max, indent, sep, term,
4792 "-f", f_options[j].string);
4794 /* Print target specific options. */
4796 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4797 if (target_switches[j].name[0] != '\0'
4798 && target_switches[j].value > 0
4799 && ((target_switches[j].value & target_flags)
4800 == target_switches[j].value))
4802 pos = print_single_switch (file, pos, max, indent, sep, term,
4803 "-m", target_switches[j].name);
4806 #ifdef TARGET_OPTIONS
4807 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4808 if (*target_options[j].variable != NULL)
4811 sprintf (prefix, "-m%s", target_options[j].prefix);
4812 pos = print_single_switch (file, pos, max, indent, sep, term,
4813 prefix, *target_options[j].variable);
4817 fprintf (file, "%s", term);
4820 /* Open assembly code output file. Do this even if -fsyntax-only is
4821 on, because then the driver will have provided the name of a
4822 temporary file or bit bucket for us. NAME is the file specified on
4823 the command line, possibly NULL. */
4825 init_asm_output (name)
4828 if (name == NULL && asm_file_name == 0)
4829 asm_out_file = stdout;
4832 if (asm_file_name == 0)
4834 int len = strlen (dump_base_name);
4835 char *dumpname = (char *) xmalloc (len + 6);
4836 memcpy (dumpname, dump_base_name, len + 1);
4837 strip_off_ending (dumpname, len);
4838 strcat (dumpname, ".s");
4839 asm_file_name = dumpname;
4841 if (!strcmp (asm_file_name, "-"))
4842 asm_out_file = stdout;
4844 asm_out_file = fopen (asm_file_name, "w+");
4845 if (asm_out_file == 0)
4846 fatal_io_error ("can't open %s for writing", asm_file_name);
4849 #ifdef IO_BUFFER_SIZE
4850 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4851 _IOFBF, IO_BUFFER_SIZE);
4854 if (!flag_syntax_only)
4856 #ifdef ASM_FILE_START
4857 ASM_FILE_START (asm_out_file);
4860 #ifdef ASM_COMMENT_START
4861 if (flag_verbose_asm)
4863 /* Print the list of options in effect. */
4864 print_version (asm_out_file, ASM_COMMENT_START);
4865 print_switch_values (asm_out_file, 0, MAX_LINE,
4866 ASM_COMMENT_START, " ", "\n");
4867 /* Add a blank line here so it appears in assembler output but not
4869 fprintf (asm_out_file, "\n");
4875 /* Initialization of the front end environment, before command line
4876 options are parsed. Signal handlers, internationalization etc.
4877 ARGV0 is main's argv[0]. */
4879 general_init (argv0)
4884 p = argv0 + strlen (argv0);
4885 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4889 xmalloc_set_program_name (progname);
4893 gcc_init_libintl ();
4895 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4897 signal (SIGSEGV, crash_signal);
4900 signal (SIGILL, crash_signal);
4903 signal (SIGBUS, crash_signal);
4906 signal (SIGABRT, crash_signal);
4908 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4909 signal (SIGIOT, crash_signal);
4912 signal (SIGFPE, crash_signal);
4915 /* Other host-specific signal setup. */
4916 (*host_hooks.extra_signals)();
4918 /* Initialize the diagnostics reporting machinery, so option parsing
4919 can give warnings and errors. */
4920 diagnostic_initialize (global_dc);
4922 /* Initialize the garbage-collector, string pools and tree type hash
4929 /* Parse command line options and set default flag values, called
4930 after language-independent option-independent initialization. Do
4931 minimal options processing. Outputting diagnostics is OK, but GC
4932 and identifier hashtables etc. are not initialized yet.
4934 Return nonzero to suppress compiler back end initialization. */
4936 parse_options_and_default_flags (argc, argv)
4942 /* Save in case md file wants to emit args as a comment. */
4946 /* Initialize register usage now so switches may override. */
4949 /* Register the language-independent parameters. */
4950 add_params (lang_independent_params, LAST_PARAM);
4952 /* This must be done after add_params but before argument processing. */
4953 init_ggc_heuristics();
4955 /* Perform language-specific options initialization. */
4956 (*lang_hooks.init_options) ();
4958 /* Scan to see what optimization level has been specified. That will
4959 determine the default value of many flags. */
4960 for (i = 1; i < argc; i++)
4962 if (!strcmp (argv[i], "-O"))
4967 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4969 /* Handle -Os, -O2, -O3, -O69, ... */
4970 char *p = &argv[i][2];
4972 if ((p[0] == 's') && (p[1] == 0))
4976 /* Optimizing for size forces optimize to be 2. */
4981 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4982 if (optimize_val != -1)
4984 optimize = optimize_val;
4993 flag_merge_constants = 0;
4999 flag_thread_jumps = 1;
5001 flag_delayed_branch = 1;
5003 #ifdef CAN_DEBUG_WITHOUT_FP
5004 flag_omit_frame_pointer = 1;
5006 flag_guess_branch_prob = 1;
5007 flag_cprop_registers = 1;
5008 flag_loop_optimize = 1;
5009 flag_crossjumping = 1;
5010 flag_if_conversion = 1;
5011 flag_if_conversion2 = 1;
5016 flag_optimize_sibling_calls = 1;
5017 flag_cse_follow_jumps = 1;
5018 flag_cse_skip_blocks = 1;
5020 flag_expensive_optimizations = 1;
5021 flag_strength_reduce = 1;
5022 flag_rerun_cse_after_loop = 1;
5023 flag_rerun_loop_opt = 1;
5024 flag_caller_saves = 1;
5027 #ifdef INSN_SCHEDULING
5028 flag_schedule_insns = 1;
5029 flag_schedule_insns_after_reload = 1;
5032 flag_strict_aliasing = 1;
5033 flag_delete_null_pointer_checks = 1;
5034 flag_reorder_blocks = 1;
5035 flag_reorder_functions = 1;
5040 flag_inline_functions = 1;
5041 flag_rename_registers = 1;
5042 flag_unswitch_loops = 1;
5043 flag_unit_at_a_time = 1;
5046 if (optimize < 2 || optimize_size)
5051 align_functions = 1;
5053 /* Don't reorder blocks when optimizing for size because extra
5054 jump insns may be created; also barrier may create extra padding.
5056 More correctly we should have a block reordering mode that tried
5057 to minimize the combined size of all the jumps. This would more
5058 or less automatically remove extra jumps, but would also try to
5059 use more short jumps instead of long jumps. */
5060 flag_reorder_blocks = 0;
5063 /* Initialize whether `char' is signed. */
5064 flag_signed_char = DEFAULT_SIGNED_CHAR;
5065 #ifdef DEFAULT_SHORT_ENUMS
5066 /* Initialize how much space enums occupy, by default. */
5067 flag_short_enums = DEFAULT_SHORT_ENUMS;
5070 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5073 set_target_switch ("");
5075 /* Unwind tables are always present in an ABI-conformant IA-64
5076 object file, so the default should be ON. */
5077 #ifdef IA64_UNWIND_INFO
5078 flag_unwind_tables = IA64_UNWIND_INFO;
5081 #ifdef OPTIMIZATION_OPTIONS
5082 /* Allow default optimizations to be specified on a per-machine basis. */
5083 OPTIMIZATION_OPTIONS (optimize, optimize_size);
5086 /* Perform normal command line switch decoding. */
5087 for (i = 1; i < argc;)
5090 int indep_processed;
5092 /* Give the language a chance to decode the option for itself. */
5093 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
5095 if (lang_processed >= 0)
5096 /* Now see if the option also has a language independent meaning.
5097 Some options are both language specific and language independent,
5099 indep_processed = independent_decode_option (argc - i, argv + i);
5102 lang_processed = -lang_processed;
5103 indep_processed = 0;
5106 if (lang_processed || indep_processed)
5107 i += MAX (lang_processed, indep_processed);
5110 const char *option = NULL;
5111 const char *lang = NULL;
5114 /* It is possible that the command line switch is not valid for the
5115 current language, but it is valid for another language. In order
5116 to be compatible with previous versions of the compiler (which
5117 did not issue an error message in this case) we check for this
5118 possibility here. If we do find a match, then if extra_warnings
5119 is set we generate a warning message, otherwise we will just
5120 ignore the option. */
5121 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5123 option = documented_lang_options[j].option;
5126 lang = documented_lang_options[j].description;
5127 else if (! strncmp (argv[i], option, strlen (option)))
5131 if (j != ARRAY_SIZE (documented_lang_options))
5135 warning ("ignoring command line option '%s'", argv[i]);
5138 ("(it is valid for %s but not the selected language)",
5142 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5143 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5145 error ("unrecognized option `%s'", argv[i]);
5151 if (flag_no_inline == 2)
5154 flag_really_no_inline = flag_no_inline;
5156 /* Set flag_no_inline before the post_options () hook. The C front
5157 ends use it to determine tree inlining defaults. FIXME: such
5158 code should be lang-independent when all front ends use tree
5159 inlining, in which case it, and this condition, should be moved
5160 to the top of process_options() instead. */
5163 /* Inlining does not work if not optimizing,
5164 so force it not to be done. */
5168 /* The c_decode_option function and decode_option hook set
5169 this to `2' if -Wall is used, so we can avoid giving out
5170 lots of errors for people who don't realize what -Wall does. */
5171 if (warn_uninitialized == 1)
5172 warning ("-Wuninitialized is not supported without -O");
5175 if (flag_really_no_inline == 2)
5176 flag_really_no_inline = flag_no_inline;
5179 /* Process the options that have been parsed. */
5183 /* Allow the front end to perform consistency checks and do further
5184 initialization based on the command line options. This hook also
5185 sets the original filename if appropriate (e.g. foo.i -> foo.c)
5186 so we can correctly initialize debug output. */
5187 no_backend = (*lang_hooks.post_options) (&filename);
5188 main_input_filename = input_filename = filename;
5190 #ifdef OVERRIDE_OPTIONS
5191 /* Some machines may reject certain combinations of options. */
5195 /* Set aux_base_name if not already set. */
5200 char *name = xstrdup (lbasename (filename));
5202 strip_off_ending (name, strlen (name));
5203 aux_base_name = name;
5206 aux_base_name = "gccaux";
5208 /* Set up the align_*_log variables, defaulting them to 1 if they
5209 were still unset. */
5210 if (align_loops <= 0) align_loops = 1;
5211 if (align_loops_max_skip > align_loops || !align_loops)
5212 align_loops_max_skip = align_loops - 1;
5213 align_loops_log = floor_log2 (align_loops * 2 - 1);
5214 if (align_jumps <= 0) align_jumps = 1;
5215 if (align_jumps_max_skip > align_jumps || !align_jumps)
5216 align_jumps_max_skip = align_jumps - 1;
5217 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5218 if (align_labels <= 0) align_labels = 1;
5219 align_labels_log = floor_log2 (align_labels * 2 - 1);
5220 if (align_labels_max_skip > align_labels || !align_labels)
5221 align_labels_max_skip = align_labels - 1;
5222 if (align_functions <= 0) align_functions = 1;
5223 align_functions_log = floor_log2 (align_functions * 2 - 1);
5225 /* Unrolling all loops implies that standard loop unrolling must also
5227 if (flag_unroll_all_loops)
5228 flag_unroll_loops = 1;
5230 if (flag_unroll_loops)
5232 flag_old_unroll_loops = 0;
5233 flag_old_unroll_all_loops = 0;
5236 if (flag_old_unroll_all_loops)
5237 flag_old_unroll_loops = 1;
5239 /* Old loop unrolling requires that strength_reduction be on also. Silently
5240 turn on strength reduction here if it isn't already on. Also, the loop
5241 unrolling code assumes that cse will be run after loop, so that must
5242 be turned on also. */
5243 if (flag_old_unroll_loops)
5245 flag_strength_reduce = 1;
5246 flag_rerun_cse_after_loop = 1;
5248 if (flag_unroll_loops || flag_peel_loops)
5249 flag_rerun_cse_after_loop = 1;
5251 if (flag_non_call_exceptions)
5252 flag_asynchronous_unwind_tables = 1;
5253 if (flag_asynchronous_unwind_tables)
5254 flag_unwind_tables = 1;
5256 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5258 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
5259 flag_unit_at_a_time = 0;
5261 /* Warn about options that are not supported on this machine. */
5262 #ifndef INSN_SCHEDULING
5263 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5264 warning ("instruction scheduling not supported on this target machine");
5267 if (flag_delayed_branch)
5268 warning ("this target machine does not have delayed branches");
5271 user_label_prefix = USER_LABEL_PREFIX;
5272 if (flag_leading_underscore != -1)
5274 /* If the default prefix is more complicated than "" or "_",
5275 issue a warning and ignore this option. */
5276 if (user_label_prefix[0] == 0 ||
5277 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5279 user_label_prefix = flag_leading_underscore ? "_" : "";
5282 warning ("-f%sleading-underscore not supported on this target machine",
5283 flag_leading_underscore ? "" : "no-");
5286 /* If we are in verbose mode, write out the version and maybe all the
5287 option flags in use. */
5290 print_version (stderr, "");
5292 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5295 if (! quiet_flag || flag_detailed_statistics)
5298 if (flag_syntax_only)
5300 write_symbols = NO_DEBUG;
5304 /* Now we know write_symbols, set up the debug hooks based on it.
5305 By default we do nothing for debug output. */
5306 #if defined(DBX_DEBUGGING_INFO)
5307 if (write_symbols == DBX_DEBUG)
5308 debug_hooks = &dbx_debug_hooks;
5310 #if defined(XCOFF_DEBUGGING_INFO)
5311 if (write_symbols == XCOFF_DEBUG)
5312 debug_hooks = &xcoff_debug_hooks;
5314 #ifdef SDB_DEBUGGING_INFO
5315 if (write_symbols == SDB_DEBUG)
5316 debug_hooks = &sdb_debug_hooks;
5318 #ifdef DWARF_DEBUGGING_INFO
5319 if (write_symbols == DWARF_DEBUG)
5320 debug_hooks = &dwarf_debug_hooks;
5322 #ifdef DWARF2_DEBUGGING_INFO
5323 if (write_symbols == DWARF2_DEBUG)
5324 debug_hooks = &dwarf2_debug_hooks;
5326 #ifdef VMS_DEBUGGING_INFO
5327 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5328 debug_hooks = &vmsdbg_debug_hooks;
5331 /* If auxiliary info generation is desired, open the output file.
5332 This goes in the same directory as the source file--unlike
5333 all the other output files. */
5334 if (flag_gen_aux_info)
5336 aux_info_file = fopen (aux_info_file_name, "w");
5337 if (aux_info_file == 0)
5338 fatal_io_error ("can't open %s", aux_info_file_name);
5341 if (! targetm.have_named_sections)
5343 if (flag_function_sections)
5345 warning ("-ffunction-sections not supported for this target");
5346 flag_function_sections = 0;
5348 if (flag_data_sections)
5350 warning ("-fdata-sections not supported for this target");
5351 flag_data_sections = 0;
5355 if (flag_function_sections && profile_flag)
5357 warning ("-ffunction-sections disabled; it makes profiling impossible");
5358 flag_function_sections = 0;
5361 #ifndef HAVE_prefetch
5362 if (flag_prefetch_loop_arrays)
5364 warning ("-fprefetch-loop-arrays not supported for this target");
5365 flag_prefetch_loop_arrays = 0;
5368 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5370 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5371 flag_prefetch_loop_arrays = 0;
5375 /* This combination of options isn't handled for i386 targets and doesn't
5376 make much sense anyway, so don't allow it. */
5377 if (flag_prefetch_loop_arrays && optimize_size)
5379 warning ("-fprefetch-loop-arrays is not supported with -Os");
5380 flag_prefetch_loop_arrays = 0;
5383 #ifndef OBJECT_FORMAT_ELF
5384 if (flag_function_sections && write_symbols != NO_DEBUG)
5385 warning ("-ffunction-sections may affect debugging on some targets");
5388 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5389 if (flag_signaling_nans)
5390 flag_trapping_math = 1;
5393 /* Initialize the compiler back end. */
5397 /* init_emit_once uses reg_raw_mode and therefore must be called
5398 after init_regs which initialized reg_raw_mode. */
5400 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5401 || debug_info_level == DINFO_LEVEL_VERBOSE
5402 #ifdef VMS_DEBUGGING_INFO
5403 /* Enable line number info for traceback */
5404 || debug_info_level > DINFO_LEVEL_NONE
5406 || flag_test_coverage
5407 || warn_notreached);
5408 init_fake_stack_mems ();
5412 init_function_once ();
5413 init_varasm_once ();
5415 /* The following initialization functions need to generate rtl, so
5416 provide a dummy function context for them. */
5417 init_dummy_function_start ();
5419 if (flag_caller_saves)
5420 init_caller_save ();
5421 expand_dummy_function_end ();
5424 /* Language-dependent initialization. Returns nonzero on success. */
5426 lang_dependent_init (name)
5429 if (dump_base_name == 0)
5430 dump_base_name = name ? name : "gccdump";
5432 /* Other front-end initialization. */
5433 if ((*lang_hooks.init) () == 0)
5436 init_asm_output (name);
5438 /* These create various _DECL nodes, so need to be called after the
5439 front end is initialized. */
5443 /* The following initialization functions need to generate rtl, so
5444 provide a dummy function context for them. */
5445 init_dummy_function_start ();
5447 expand_dummy_function_end ();
5449 /* Put an entry on the input file stack for the main input file. */
5450 push_srcloc (input_filename, 0);
5452 /* If dbx symbol table desired, initialize writing it and output the
5453 predefined types. */
5454 timevar_push (TV_SYMOUT);
5456 #ifdef DWARF2_UNWIND_INFO
5457 if (dwarf2out_do_frame ())
5458 dwarf2out_frame_init ();
5461 /* Now we have the correct original filename, we can initialize
5463 (*debug_hooks->init) (name);
5465 timevar_pop (TV_SYMOUT);
5470 /* Clean up: close opened files, etc. */
5475 /* Close the dump files. */
5476 if (flag_gen_aux_info)
5478 fclose (aux_info_file);
5480 unlink (aux_info_file_name);
5483 /* Close non-debugging input and output files. Take special care to note
5484 whether fclose returns an error, since the pages might still be on the
5485 buffer chain while the file is open. */
5489 if (ferror (asm_out_file) != 0)
5490 fatal_io_error ("error writing to %s", asm_file_name);
5491 if (fclose (asm_out_file) != 0)
5492 fatal_io_error ("error closing %s", asm_file_name);
5495 /* Do whatever is necessary to finish printing the graphs. */
5496 if (graph_dump_format != no_graph)
5500 for (i = 0; i < (int) DFI_MAX; ++i)
5501 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5506 sprintf (seq, DUMPFILE_FORMAT, i);
5507 suffix = concat (seq, dump_file[i].extension, NULL);
5508 finish_graph_dump_file (dump_base_name, suffix);
5515 ggc_print_statistics ();
5516 stringpool_statistics ();
5517 dump_tree_statistics ();
5520 /* Free up memory for the benefit of leak detectors. */
5523 /* Language-specific end of compilation actions. */
5524 (*lang_hooks.finish) ();
5527 /* Initialize the compiler, and compile the input file. */
5531 /* We cannot start timing until after options are processed since that
5532 says if we run timers or not. */
5534 timevar_start (TV_TOTAL);
5536 /* Set up the back-end if requested. */
5540 /* Language-dependent initialization. Returns true on success. */
5541 if (lang_dependent_init (filename))
5546 /* Stop timing and print the times. */
5547 timevar_stop (TV_TOTAL);
5548 timevar_print (stderr);
5551 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5552 Decode command args, then call compile_file.
5553 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5554 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5556 It is not safe to call this function more than once. */
5559 toplev_main (argc, argv)
5563 /* Initialization of GCC's environment, and diagnostics. */
5564 general_init (argv[0]);
5566 /* Parse the options and do minimal processing; basically just
5567 enough to default flags appropriately. */
5568 parse_options_and_default_flags (argc, argv);
5570 /* Exit early if we can (e.g. -help). */
5571 if (!exit_after_options)
5575 /* Don't do any more if an error has already occurred. */
5580 if (errorcount || sorrycount)
5581 return (FATAL_EXIT_CODE);
5583 return (SUCCESS_EXIT_CODE);