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 top-level original source file (what was input to cpp).
153 This comes from the #-command at the beginning of the actual input.
154 If there isn't any there, then this is the cc1 input file name. */
156 const char *main_input_filename;
158 /* Current position in real source file. */
160 location_t input_location;
162 /* Nonzero if it is unsafe to create any new pseudo registers. */
165 /* Stack of currently pending input files. */
167 struct file_stack *input_file_stack;
169 /* Incremented on each change to input_file_stack. */
170 int input_file_stack_tick;
172 /* Name to use as base of names for dump output files. */
174 const char *dump_base_name;
176 /* Name to use as a base for auxiliary output files. */
178 static const char *aux_base_name;
180 /* Format to use to print dumpfile index value */
181 #ifndef DUMPFILE_FORMAT
182 #define DUMPFILE_FORMAT ".%02d."
185 /* Bit flags that specify the machine subtype we are compiling for.
186 Bits are tested using macros TARGET_... defined in the tm.h file
187 and set by `-m...' switches. Must be defined in rtlanal.c. */
189 extern int target_flags;
191 /* A mask of target_flags that includes bit X if X was set or cleared
192 on the command line. */
194 int target_flags_explicit;
196 /* Debug hooks - dependent upon command line options. */
198 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
200 /* Describes a dump file. */
202 struct dump_file_info
204 /* The unique extension to apply, e.g. ".jump". */
205 const char *const extension;
207 /* The -d<c> character that enables this dump file. */
208 char const debug_switch;
210 /* True if there is a corresponding graph dump file. */
211 char const graph_dump_p;
213 /* True if the user selected this dump. */
216 /* True if the files have been initialized (ie truncated). */
220 /* Enumerate the extant dump files. */
264 /* Describes all the dump files. Should be kept in order of the
265 pass and in sync with dump_file_index above.
267 Remaining -d letters:
273 static struct dump_file_info dump_file[DFI_MAX] =
275 { "rtl", 'r', 0, 0, 0 },
276 { "sibling", 'i', 0, 0, 0 },
277 { "eh", 'h', 0, 0, 0 },
278 { "jump", 'j', 0, 0, 0 },
279 { "ssa", 'e', 1, 0, 0 },
280 { "ssaccp", 'W', 1, 0, 0 },
281 { "ssadce", 'X', 1, 0, 0 },
282 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
283 { "null", 'u', 0, 0, 0 },
284 { "cse", 's', 0, 0, 0 },
285 { "addressof", 'F', 0, 0, 0 },
286 { "gcse", 'G', 1, 0, 0 },
287 { "loop", 'L', 1, 0, 0 },
288 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
289 { "cfg", 'f', 1, 0, 0 },
290 { "bp", 'b', 1, 0, 0 },
291 { "ce1", 'C', 1, 0, 0 },
292 { "tracer", 'T', 1, 0, 0 },
293 { "loop2", 'L', 1, 0, 0 },
294 { "cse2", 't', 1, 0, 0 },
295 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
296 { "combine", 'c', 1, 0, 0 },
297 { "ce2", 'C', 1, 0, 0 },
298 { "regmove", 'N', 1, 0, 0 },
299 { "sched", 'S', 1, 0, 0 },
300 { "lreg", 'l', 1, 0, 0 },
301 { "greg", 'g', 1, 0, 0 },
302 { "postreload", 'o', 1, 0, 0 },
303 { "flow2", 'w', 1, 0, 0 },
304 { "peephole2", 'z', 1, 0, 0 },
305 { "rnreg", 'n', 1, 0, 0 },
306 { "ce3", 'E', 1, 0, 0 },
307 { "bbro", 'B', 1, 0, 0 },
308 { "sched2", 'R', 1, 0, 0 },
309 { "stack", 'k', 1, 0, 0 },
310 { "mach", 'M', 1, 0, 0 },
311 { "dbr", 'd', 0, 0, 0 },
314 static int open_dump_file PARAMS ((enum dump_file_index, tree));
315 static void close_dump_file PARAMS ((enum dump_file_index,
316 void (*) (FILE *, rtx), rtx));
318 /* Other flags saying which kinds of debugging dump have been requested. */
320 int rtl_dump_and_exit;
321 int flag_print_asm_name;
322 static int version_flag;
323 static const char *filename;
324 enum graph_dump_types graph_dump_format;
326 /* Name for output file of assembly code, specified with -o. */
330 /* Value of the -G xx switch, and whether it was passed or not. */
334 /* Type(s) of debugging information we are producing (if any).
335 See flags.h for the definitions of the different possible
336 types of debugging information. */
337 enum debug_info_type write_symbols = NO_DEBUG;
339 /* Level of debugging information we are producing. See flags.h
340 for the definitions of the different possible levels. */
341 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
343 /* Nonzero means use GNU-only extensions in the generated symbolic
344 debugging information. */
345 /* Currently, this only has an effect when write_symbols is set to
346 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
347 int use_gnu_debug_info_extensions = 0;
349 /* Nonzero means do optimizations. -O.
350 Particular numeric values stand for particular amounts of optimization;
351 thus, -O2 stores 2 here. However, the optimizations beyond the basic
352 ones are not controlled directly by this variable. Instead, they are
353 controlled by individual `flag_...' variables that are defaulted
354 based on this variable. */
358 /* Nonzero means optimize for size. -Os.
359 The only valid values are zero and nonzero. When optimize_size is
360 nonzero, optimize defaults to 2, but certain individual code
361 bloating optimizations are disabled. */
363 int optimize_size = 0;
365 /* Nonzero if we should exit after parsing options. */
366 static int exit_after_options = 0;
368 /* The FUNCTION_DECL for the function currently being compiled,
369 or 0 if between functions. */
370 tree current_function_decl;
372 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
374 tree current_function_func_begin_label;
376 /* Nonzero if doing dwarf2 duplicate elimination. */
378 int flag_eliminate_dwarf2_dups = 0;
380 /* Nonzero if doing unused type elimination. */
382 int flag_eliminate_unused_debug_types = 1;
384 /* Nonzero if generating code to do profiling. */
386 int profile_flag = 0;
388 /* Nonzero if generating code to profile program flow graph arcs. */
390 int profile_arc_flag = 0;
392 /* Nonzero if generating info for gcov to calculate line test coverage. */
394 int flag_test_coverage = 0;
396 /* Nonzero indicates that branch taken probabilities should be calculated. */
398 int flag_branch_probabilities = 0;
400 /* Nonzero if basic blocks should be reordered. */
402 int flag_reorder_blocks = 0;
404 /* Nonzero if functions should be reordered. */
406 int flag_reorder_functions = 0;
408 /* Nonzero if registers should be renamed. */
410 int flag_rename_registers = 0;
411 int flag_cprop_registers = 0;
413 /* Nonzero for -pedantic switch: warn about anything
414 that standard spec forbids. */
418 /* Temporarily suppress certain warnings.
419 This is set while reading code from a system header file. */
421 int in_system_header = 0;
423 /* Don't print functions as they are compiled. -quiet. */
427 /* Print times taken by the various passes. -ftime-report. */
429 static int time_report = 0;
431 /* Print memory still in use at end of compilation (which may have little
432 to do with peak memory consumption). -fmem-report. */
436 /* Nonzero means to collect statistics which might be expensive
437 and to print them when we are done. */
438 int flag_detailed_statistics = 0;
443 /* Nonzero means `char' should be signed. */
445 int flag_signed_char;
447 /* Nonzero means give an enum type only as many bytes as it needs. */
449 int flag_short_enums;
451 /* Nonzero for -fcaller-saves: allocate values in regs that need to
452 be saved across function calls, if that produces overall better code.
453 Optional now, so people can test it. */
455 #ifdef DEFAULT_CALLER_SAVES
456 int flag_caller_saves = 1;
458 int flag_caller_saves = 0;
461 /* Nonzero if structures and unions should be returned in memory.
463 This should only be defined if compatibility with another compiler or
464 with an ABI is needed, because it results in slower code. */
466 #ifndef DEFAULT_PCC_STRUCT_RETURN
467 #define DEFAULT_PCC_STRUCT_RETURN 1
470 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
472 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
474 /* Nonzero for -fforce-mem: load memory value into a register
475 before arithmetic on it. This makes better cse but slower compilation. */
477 int flag_force_mem = 0;
479 /* Nonzero for -fforce-addr: load memory address into a register before
480 reference to memory. This makes better cse but slower compilation. */
482 int flag_force_addr = 0;
484 /* Nonzero for -fdefer-pop: don't pop args after each function call;
485 instead save them up to pop many calls' args with one insns. */
487 int flag_defer_pop = 0;
489 /* Nonzero for -ffloat-store: don't allocate floats and doubles
490 in extended-precision registers. */
492 int flag_float_store = 0;
494 /* Nonzero for -fcse-follow-jumps:
495 have cse follow jumps to do a more extensive job. */
497 int flag_cse_follow_jumps;
499 /* Nonzero for -fcse-skip-blocks:
500 have cse follow a branch around a block. */
501 int flag_cse_skip_blocks;
503 /* Nonzero for -fexpensive-optimizations:
504 perform miscellaneous relatively-expensive optimizations. */
505 int flag_expensive_optimizations;
507 /* Nonzero for -fthread-jumps:
508 have jump optimize output of loop. */
510 int flag_thread_jumps;
512 /* Nonzero enables strength-reduction in loop.c. */
514 int flag_strength_reduce = 0;
516 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
517 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
518 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
521 int flag_old_unroll_loops;
523 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
524 This is generally not a win. */
526 int flag_old_unroll_all_loops;
528 /* Enables unrolling of simple loops in loop-unroll.c. */
529 int flag_unroll_loops;
531 /* Enables unrolling of all loops in loop-unroll.c. */
532 int flag_unroll_all_loops;
534 /* Nonzero enables loop peeling. */
537 /* Nonzero enables loop unswitching. */
538 int flag_unswitch_loops;
540 /* Nonzero enables prefetch optimizations for arrays in loops. */
542 int flag_prefetch_loop_arrays;
544 /* Nonzero forces all invariant computations in loops to be moved
547 int flag_move_all_movables = 0;
549 /* Nonzero forces all general induction variables in loops to be
552 int flag_reduce_all_givs = 0;
554 /* Nonzero to perform full register move optimization passes. This is the
557 int flag_regmove = 0;
559 /* Nonzero for -fwritable-strings:
560 store string constants in data segment and don't uniquize them. */
562 int flag_writable_strings = 0;
564 /* Nonzero means don't put addresses of constant functions in registers.
565 Used for compiling the Unix kernel, where strange substitutions are
566 done on the assembly output. */
568 int flag_no_function_cse = 0;
570 /* Nonzero for -fomit-frame-pointer:
571 don't make a frame pointer in simple functions that don't require one. */
573 int flag_omit_frame_pointer = 0;
575 /* Nonzero means place each function into its own section on those platforms
576 which support arbitrary section names and unlimited numbers of sections. */
578 int flag_function_sections = 0;
580 /* ... and similar for data. */
582 int flag_data_sections = 0;
584 /* Nonzero to inhibit use of define_optimization peephole opts. */
586 int flag_no_peephole = 0;
588 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
590 int flag_optimize_sibling_calls = 0;
592 /* Nonzero means the front end generally wants `errno' maintained by math
593 operations, like built-in SQRT. */
595 int flag_errno_math = 1;
597 /* Nonzero means that unsafe floating-point math optimizations are allowed
598 for the sake of speed. IEEE compliance is not guaranteed, and operations
599 are allowed to assume that their arguments and results are "normal"
600 (e.g., nonnegative for SQRT). */
602 int flag_unsafe_math_optimizations = 0;
604 /* Nonzero means that no NaNs or +-Infs are expected. */
606 int flag_finite_math_only = 0;
608 /* Zero means that floating-point math operations cannot generate a
609 (user-visible) trap. This is the case, for example, in nonstop
610 IEEE 754 arithmetic. Trapping conditions include division by zero,
611 overflow, underflow, invalid and inexact, but does not include
612 operations on signaling NaNs (see below). */
614 int flag_trapping_math = 1;
616 /* Nonzero means disable transformations observable by signaling NaNs.
617 This option implies that any operation on a IEEE signaling NaN can
618 generate a (user-visible) trap. */
620 int flag_signaling_nans = 0;
622 /* 0 means straightforward implementation of complex divide acceptable.
623 1 means wide ranges of inputs must work for complex divide.
624 2 means C99-like requirements for complex divide (not yet implemented). */
626 int flag_complex_divide_method = 0;
628 /* Nonzero means just do syntax checking; don't output anything. */
630 int flag_syntax_only = 0;
632 /* Nonzero means perform loop optimizer. */
634 static int flag_loop_optimize;
636 /* Nonzero means perform crossjumping. */
638 static int flag_crossjumping;
640 /* Nonzero means perform if conversion. */
642 static int flag_if_conversion;
644 /* Nonzero means perform if conversion after reload. */
646 static int flag_if_conversion2;
648 /* Nonzero means to use global dataflow analysis to eliminate
649 useless null pointer tests. */
651 static int flag_delete_null_pointer_checks;
653 /* Nonzero means perform global CSE. */
657 /* Nonzero means to do the enhanced load motion during gcse, which trys
658 to hoist loads by not killing them when a store to the same location
661 int flag_gcse_lm = 1;
663 /* Nonzero means to perform store motion after gcse, which will try to
664 move stores closer to the exit block. Its not very effective without
667 int flag_gcse_sm = 1;
669 /* Nonzero means to rerun cse after loop optimization. This increases
670 compilation time about 20% and picks up a few more common expressions. */
672 static int flag_rerun_cse_after_loop;
674 /* Nonzero means to run loop optimizations twice. */
676 int flag_rerun_loop_opt;
678 /* Nonzero for -finline-functions: ok to inline functions that look like
679 good inline candidates. */
681 int flag_inline_functions;
683 /* Nonzero for -fkeep-inline-functions: even if we make a function
684 go inline everywhere, keep its definition around for debugging
687 int flag_keep_inline_functions;
689 /* Nonzero means that functions will not be inlined. */
691 int flag_no_inline = 2;
693 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
694 not just because the tree inliner turned us off. */
696 int flag_really_no_inline = 2;
698 /* Nonzero means that we should emit static const variables
699 regardless of whether or not optimization is turned on. */
701 int flag_keep_static_consts = 1;
703 /* Nonzero means we should be saving declaration info into a .X file. */
705 int flag_gen_aux_info = 0;
707 /* Specified name of aux-info file. */
709 static char *aux_info_file_name;
711 /* Nonzero means make the text shared if supported. */
713 int flag_shared_data;
715 /* Nonzero means schedule into delayed branch slots if supported. */
717 int flag_delayed_branch;
719 /* Nonzero if we are compiling pure (sharable) code.
720 Value is 1 if we are doing "small" pic; value is 2 if we're doing
725 /* Set to the default thread-local storage (tls) model to use. */
727 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
729 /* Nonzero means generate extra code for exception handling and enable
730 exception handling. */
734 /* Nonzero means generate frame unwind info table when supported. */
736 int flag_unwind_tables = 0;
738 /* Nonzero means generate frame unwind info table exact at each insn boundary */
740 int flag_asynchronous_unwind_tables = 0;
742 /* Nonzero means allow for forced unwinding. */
744 int flag_forced_unwind_exceptions;
746 /* Nonzero means don't place uninitialized global data in common storage
751 /* Nonzero means change certain warnings into errors.
752 Usually these are warnings about failure to conform to some standard. */
754 int flag_pedantic_errors = 0;
756 /* flag_schedule_insns means schedule insns within basic blocks (before
758 flag_schedule_insns_after_reload means schedule insns after
761 int flag_schedule_insns = 0;
762 int flag_schedule_insns_after_reload = 0;
764 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
765 int flag_sched2_use_superblocks = 0;
767 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
769 int flag_sched2_use_traces = 0;
771 /* The following flags have effect only for scheduling before register
774 flag_schedule_interblock means schedule insns across basic blocks.
775 flag_schedule_speculative means allow speculative motion of non-load insns.
776 flag_schedule_speculative_load means allow speculative motion of some
778 flag_schedule_speculative_load_dangerous allows speculative motion of more
781 int flag_schedule_interblock = 1;
782 int flag_schedule_speculative = 1;
783 int flag_schedule_speculative_load = 0;
784 int flag_schedule_speculative_load_dangerous = 0;
786 int flag_single_precision_constant;
788 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
789 by a cheaper branch on a count register. */
790 int flag_branch_on_count_reg = 1;
792 /* -finhibit-size-directive inhibits output of .size for ELF.
793 This is used only for compiling crtstuff.c,
794 and it may be extended to other effects
795 needed for crtstuff.c on other systems. */
796 int flag_inhibit_size_directive = 0;
798 /* -fverbose-asm causes extra commentary information to be produced in
799 the generated assembly code (to make it more readable). This option
800 is generally only of use to those who actually need to read the
801 generated assembly code (perhaps while debugging the compiler itself).
802 -fno-verbose-asm, the default, causes the extra information
803 to be omitted and is useful when comparing two assembler files. */
805 int flag_verbose_asm = 0;
807 /* -dA causes debug commentary information to be produced in
808 the generated assembly code (to make it more readable). This option
809 is generally only of use to those who actually need to read the
810 generated assembly code (perhaps while debugging the compiler itself).
811 Currently, this switch is only used by dwarfout.c; however, it is intended
812 to be a catchall for printing debug information in the assembler file. */
814 int flag_debug_asm = 0;
816 /* -dP causes the rtl to be emitted as a comment in assembly. */
818 int flag_dump_rtl_in_asm = 0;
820 /* -fgnu-linker specifies use of the GNU linker for initializations.
821 (Or, more generally, a linker that handles initializations.)
822 -fno-gnu-linker says that collect2 will be used. */
824 int flag_gnu_linker = 0;
826 int flag_gnu_linker = 1;
829 /* Nonzero means put zero initialized data in the bss section. */
830 int flag_zero_initialized_in_bss = 1;
835 /* Enable ssa conditional constant propagation. */
836 int flag_ssa_ccp = 0;
838 /* Enable ssa aggressive dead code elimination. */
839 int flag_ssa_dce = 0;
841 /* Tag all structures with __attribute__(packed). */
842 int flag_pack_struct = 0;
844 /* Emit code to check for stack overflow; also may cause large objects
845 to be allocated dynamically. */
846 int flag_stack_check;
848 /* When non-NULL, indicates that whenever space is allocated on the
849 stack, the resulting stack pointer must not pass this
850 address---that is, for stacks that grow downward, the stack pointer
851 must always be greater than or equal to this address; for stacks
852 that grow upward, the stack pointer must be less than this address.
853 At present, the rtx may be either a REG or a SYMBOL_REF, although
854 the support provided depends on the backend. */
857 /* 0 if pointer arguments may alias each other. True in C.
858 1 if pointer arguments may not alias each other but may alias
860 2 if pointer arguments may not alias each other and may not
861 alias global variables. True in Fortran.
862 This defaults to 0 for C. */
863 int flag_argument_noalias = 0;
865 /* Nonzero if we should do (language-dependent) alias analysis.
866 Typically, this analysis will assume that expressions of certain
867 types do not alias expressions of certain other types. Only used
868 if alias analysis (in general) is enabled. */
869 int flag_strict_aliasing = 0;
871 /* Instrument functions with calls at entry and exit, for profiling. */
872 int flag_instrument_function_entry_exit = 0;
874 /* Nonzero means ignore `#ident' directives. 0 means handle them.
875 On SVR4 targets, it also controls whether or not to emit a
876 string identifying the compiler. */
878 int flag_no_ident = 0;
880 /* This will perform a peephole pass before sched2. */
881 int flag_peephole2 = 0;
883 /* This will try to guess branch probabilities. */
884 int flag_guess_branch_prob = 0;
886 /* -fcheck-bounds causes gcc to generate array bounds checks.
887 For C, C++, ObjC: defaults to off.
888 For Java: defaults to on.
889 For Fortran: defaults to off. */
890 int flag_bounds_check = 0;
892 /* This will attempt to merge constant section constants, if 1 only
893 string constants and constants from constant pool, if 2 also constant
895 int flag_merge_constants = 1;
897 /* If one, renumber instruction UIDs to reduce the number of
898 unused UIDs if there are a lot of instructions. If greater than
899 one, unconditionally renumber instruction UIDs. */
900 int flag_renumber_insns = 1;
902 /* If nonzero, use the graph coloring register allocator. */
903 int flag_new_regalloc = 0;
905 /* Nonzero if we perform superblock formation. */
909 /* Nonzero if we perform whole unit at a time compilation. */
911 int flag_unit_at_a_time = 0;
913 /* Values of the -falign-* flags: how much to align labels in code.
914 0 means `use default', 1 means `don't align'.
915 For each variable, there is an _log variant which is the power
916 of two not less than the variable, for .align output. */
920 int align_loops_max_skip;
923 int align_jumps_max_skip;
925 int align_labels_log;
926 int align_labels_max_skip;
928 int align_functions_log;
930 /* Like align_functions_log above, but used by front-ends to force the
931 minimum function alignment. Zero means no alignment is forced. */
932 int force_align_functions_log;
934 /* Table of supported debugging formats. */
937 const char *const arg;
938 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
939 constant expression, we use NO_DEBUG in its place. */
940 const enum debug_info_type debug_type;
941 const int use_extensions_p;
942 const char *const description;
946 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
947 N_("Generate debugging info in default format") },
948 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
949 #ifdef DBX_DEBUGGING_INFO
950 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
951 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
953 #ifdef DWARF_DEBUGGING_INFO
954 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
955 { "dwarf+", DWARF_DEBUG, 1,
956 N_("Generate extended DWARF-1 format debug info") },
958 #ifdef DWARF2_DEBUGGING_INFO
959 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
961 #ifdef XCOFF_DEBUGGING_INFO
962 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
963 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
965 #ifdef SDB_DEBUGGING_INFO
966 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
968 #ifdef VMS_DEBUGGING_INFO
969 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
976 const char *const string;
979 const char *const description;
981 lang_independent_options;
985 /* Add or remove a leading underscore from user symbols. */
986 int flag_leading_underscore = -1;
988 /* The user symbol prefix after having resolved same. */
989 const char *user_label_prefix;
991 static const param_info lang_independent_params[] = {
992 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
993 { OPTION, DEFAULT, HELP },
994 #include "params.def"
999 /* Table of language-independent -f options.
1000 STRING is the option name. VARIABLE is the address of the variable.
1001 ON_VALUE is the value to store in VARIABLE
1002 if `-fSTRING' is seen as an option.
1003 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1005 static const lang_independent_options f_options[] =
1007 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
1008 N_("Perform DWARF2 duplicate elimination") },
1009 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1,
1010 N_("Perform unused type elimination in debug info") },
1011 {"float-store", &flag_float_store, 1,
1012 N_("Do not store floats in registers") },
1013 {"defer-pop", &flag_defer_pop, 1,
1014 N_("Defer popping functions args from stack until later") },
1015 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1016 N_("When possible do not generate stack frames") },
1017 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1018 N_("Optimize sibling and tail recursive calls") },
1019 {"tracer", &flag_tracer, 1,
1020 N_("Perform superblock formation via tail duplication") },
1021 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1022 N_("Compile whole compilation unit at a time") },
1023 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1024 N_("When running CSE, follow jumps to their targets") },
1025 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1026 N_("When running CSE, follow conditional jumps") },
1027 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1028 N_("Perform a number of minor, expensive optimizations") },
1029 {"thread-jumps", &flag_thread_jumps, 1,
1030 N_("Perform jump threading optimizations") },
1031 {"strength-reduce", &flag_strength_reduce, 1,
1032 N_("Perform strength reduction optimizations") },
1033 {"unroll-loops", &flag_unroll_loops, 1,
1034 N_("Perform loop unrolling when iteration count is known") },
1035 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1036 N_("Perform loop unrolling for all loops") },
1037 {"old-unroll-loops", &flag_old_unroll_loops, 1,
1038 N_("Perform loop unrolling when iteration count is known") },
1039 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1,
1040 N_("Perform loop unrolling for all loops") },
1041 {"peel-loops", &flag_peel_loops, 1,
1042 N_("Perform loop peeling") },
1043 {"unswitch-loops", &flag_unswitch_loops, 1,
1044 N_("Perform loop unswitching") },
1045 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1046 N_("Generate prefetch instructions, if available, for arrays in loops") },
1047 {"move-all-movables", &flag_move_all_movables, 1,
1048 N_("Force all loop invariant computations out of loops") },
1049 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1050 N_("Strength reduce all loop general induction variables") },
1051 {"writable-strings", &flag_writable_strings, 1,
1052 N_("Store strings in writable data section") },
1053 {"peephole", &flag_no_peephole, 0,
1054 N_("Enable machine specific peephole optimizations") },
1055 {"force-mem", &flag_force_mem, 1,
1056 N_("Copy memory operands into registers before using") },
1057 {"force-addr", &flag_force_addr, 1,
1058 N_("Copy memory address constants into regs before using") },
1059 {"function-cse", &flag_no_function_cse, 0,
1060 N_("Allow function addresses to be held in registers") },
1061 {"inline-functions", &flag_inline_functions, 1,
1062 N_("Integrate simple functions into their callers") },
1063 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1064 N_("Generate code for funcs even if they are fully inlined") },
1065 {"inline", &flag_no_inline, 0,
1066 N_("Pay attention to the 'inline' keyword") },
1067 {"keep-static-consts", &flag_keep_static_consts, 1,
1068 N_("Emit static const variables even if they are not used") },
1069 {"syntax-only", &flag_syntax_only, 1,
1070 N_("Check for syntax errors, then stop") },
1071 {"shared-data", &flag_shared_data, 1,
1072 N_("Mark data as shared rather than private") },
1073 {"caller-saves", &flag_caller_saves, 1,
1074 N_("Enable saving registers around function calls") },
1075 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1076 N_("Return 'short' aggregates in memory, not registers") },
1077 {"reg-struct-return", &flag_pcc_struct_return, 0,
1078 N_("Return 'short' aggregates in registers") },
1079 {"delayed-branch", &flag_delayed_branch, 1,
1080 N_("Attempt to fill delay slots of branch instructions") },
1081 {"gcse", &flag_gcse, 1,
1082 N_("Perform the global common subexpression elimination") },
1083 {"gcse-lm", &flag_gcse_lm, 1,
1084 N_("Perform enhanced load motion during global subexpression elimination") },
1085 {"gcse-sm", &flag_gcse_sm, 1,
1086 N_("Perform store motion after global subexpression elimination") },
1087 {"loop-optimize", &flag_loop_optimize, 1,
1088 N_("Perform the loop optimizations") },
1089 {"crossjumping", &flag_crossjumping, 1,
1090 N_("Perform cross-jumping optimization") },
1091 {"if-conversion", &flag_if_conversion, 1,
1092 N_("Perform conversion of conditional jumps to branchless equivalents") },
1093 {"if-conversion2", &flag_if_conversion2, 1,
1094 N_("Perform conversion of conditional jumps to conditional execution") },
1095 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1096 N_("Run CSE pass after loop optimizations") },
1097 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1098 N_("Run the loop optimizer twice") },
1099 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1100 N_("Delete useless null pointer checks") },
1101 {"schedule-insns", &flag_schedule_insns, 1,
1102 N_("Reschedule instructions before register allocation") },
1103 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1104 N_("Reschedule instructions after register allocation") },
1105 {"sched-interblock",&flag_schedule_interblock, 1,
1106 N_("Enable scheduling across basic blocks") },
1107 {"sched-spec",&flag_schedule_speculative, 1,
1108 N_("Allow speculative motion of non-loads") },
1109 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1110 N_("Allow speculative motion of some loads") },
1111 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1112 N_("Allow speculative motion of more loads") },
1113 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1114 N_("If scheduling post reload, do superblock scheduling") },
1115 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1116 N_("If scheduling post reload, do trace scheduling") },
1117 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1118 N_("Replace add,compare,branch with branch on count reg") },
1119 {"pic", &flag_pic, 1,
1120 N_("Generate position independent code, if possible") },
1121 {"PIC", &flag_pic, 2, ""},
1122 {"exceptions", &flag_exceptions, 1,
1123 N_("Enable exception handling") },
1124 {"unwind-tables", &flag_unwind_tables, 1,
1125 N_("Just generate unwind tables for exception handling") },
1126 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1127 N_("Generate unwind tables exact at each instruction boundary") },
1128 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1129 N_("Support synchronous non-call exceptions") },
1130 {"forced-unwind-exceptions", &flag_forced_unwind_exceptions, 1,
1131 N_("Support forced unwinding, e.g. for thread cancellation") },
1132 {"profile-arcs", &profile_arc_flag, 1,
1133 N_("Insert arc based program profiling code") },
1134 {"test-coverage", &flag_test_coverage, 1,
1135 N_("Create data files needed by gcov") },
1136 {"branch-probabilities", &flag_branch_probabilities, 1,
1137 N_("Use profiling information for branch probabilities") },
1138 {"profile", &profile_flag, 1,
1139 N_("Enable basic program profiling code") },
1140 {"reorder-blocks", &flag_reorder_blocks, 1,
1141 N_("Reorder basic blocks to improve code placement") },
1142 {"reorder-functions", &flag_reorder_functions, 1,
1143 N_("Reorder functions to improve code placement") },
1144 {"rename-registers", &flag_rename_registers, 1,
1145 N_("Do the register renaming optimization pass") },
1146 {"cprop-registers", &flag_cprop_registers, 1,
1147 N_("Do the register copy-propagation optimization pass") },
1148 {"common", &flag_no_common, 0,
1149 N_("Do not put uninitialized globals in the common section") },
1150 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1151 N_("Do not generate .size directives") },
1152 {"function-sections", &flag_function_sections, 1,
1153 N_("place each function into its own section") },
1154 {"data-sections", &flag_data_sections, 1,
1155 N_("place data items into their own section") },
1156 {"verbose-asm", &flag_verbose_asm, 1,
1157 N_("Add extra commentary to assembler output") },
1158 {"gnu-linker", &flag_gnu_linker, 1,
1159 N_("Output GNU ld formatted global initializers") },
1160 {"regmove", &flag_regmove, 1,
1161 N_("Enables a register move optimization") },
1162 {"optimize-register-move", &flag_regmove, 1,
1163 N_("Do the full regmove optimization pass") },
1164 {"pack-struct", &flag_pack_struct, 1,
1165 N_("Pack structure members together without holes") },
1166 {"stack-check", &flag_stack_check, 1,
1167 N_("Insert stack checking code into the program") },
1168 {"argument-alias", &flag_argument_noalias, 0,
1169 N_("Specify that arguments may alias each other & globals") },
1170 {"argument-noalias", &flag_argument_noalias, 1,
1171 N_("Assume arguments may alias globals but not each other") },
1172 {"argument-noalias-global", &flag_argument_noalias, 2,
1173 N_("Assume arguments do not alias each other or globals") },
1174 {"strict-aliasing", &flag_strict_aliasing, 1,
1175 N_("Assume strict aliasing rules apply") },
1176 {"align-loops", &align_loops, 0,
1177 N_("Align the start of loops") },
1178 {"align-jumps", &align_jumps, 0,
1179 N_("Align labels which are only reached by jumping") },
1180 {"align-labels", &align_labels, 0,
1181 N_("Align all labels") },
1182 {"align-functions", &align_functions, 0,
1183 N_("Align the start of functions") },
1184 {"merge-constants", &flag_merge_constants, 1,
1185 N_("Attempt to merge identical constants across compilation units") },
1186 {"merge-all-constants", &flag_merge_constants, 2,
1187 N_("Attempt to merge identical constants and constant variables") },
1188 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1189 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1190 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1191 N_("Instrument function entry/exit with profiling calls") },
1192 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1193 N_("Put zero initialized data in the bss section") },
1194 {"ssa", &flag_ssa, 1,
1195 N_("Enable SSA optimizations") },
1196 {"ssa-ccp", &flag_ssa_ccp, 1,
1197 N_("Enable SSA conditional constant propagation") },
1198 {"ssa-dce", &flag_ssa_dce, 1,
1199 N_("Enable aggressive SSA dead code elimination") },
1200 {"leading-underscore", &flag_leading_underscore, 1,
1201 N_("External symbols have a leading underscore") },
1202 {"ident", &flag_no_ident, 0,
1203 N_("Process #ident directives") },
1204 { "peephole2", &flag_peephole2, 1,
1205 N_("Enables an rtl peephole pass run before sched2") },
1206 {"finite-math-only", &flag_finite_math_only, 1,
1207 N_("Assume no NaNs or +-Infs are generated") },
1208 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1209 N_("Enables guessing of branch probabilities") },
1210 {"math-errno", &flag_errno_math, 1,
1211 N_("Set errno after built-in math functions") },
1212 {"trapping-math", &flag_trapping_math, 1,
1213 N_("Floating-point operations can trap") },
1214 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1215 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1216 {"signaling-nans", &flag_signaling_nans, 1,
1217 N_("Disable optimizations observable by IEEE signaling NaNs") },
1218 {"bounds-check", &flag_bounds_check, 1,
1219 N_("Generate code to check bounds before indexing arrays") },
1220 {"single-precision-constant", &flag_single_precision_constant, 1,
1221 N_("Convert floating point constant to single precision constant") },
1222 {"time-report", &time_report, 1,
1223 N_("Report time taken by each compiler pass at end of run") },
1224 {"mem-report", &mem_report, 1,
1225 N_("Report on permanent memory allocation at end of run") },
1226 { "trapv", &flag_trapv, 1,
1227 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1228 { "new-ra", &flag_new_regalloc, 1,
1229 N_("Use graph coloring register allocation.") },
1232 /* Table of language-specific options. */
1234 static const struct lang_opt
1236 const char *const option;
1237 const char *const description;
1239 documented_lang_options[] =
1241 /* In order not to overload the --help output, the convention
1242 used here is to only describe those options which are not
1243 enabled by default. */
1246 N_("Compile just for ISO C90") },
1248 N_("Determine language standard") },
1250 { "-fsigned-bitfields", "" },
1251 { "-funsigned-bitfields",
1252 N_("Make bit-fields by unsigned by default") },
1253 { "-fno-signed-bitfields", "" },
1254 { "-fno-unsigned-bitfields","" },
1256 N_("Make 'char' be signed by default") },
1257 { "-funsigned-char",
1258 N_("Make 'char' be unsigned by default") },
1259 { "-fno-signed-char", "" },
1260 { "-fno-unsigned-char", "" },
1264 N_("Do not recognize the 'asm' keyword") },
1265 { "-fbuiltin", "" },
1267 N_("Do not recognize any built in functions") },
1269 N_("Assume normal C execution environment") },
1270 { "-fno-hosted", "" },
1272 N_("Assume that standard libraries & main might not exist") },
1273 { "-fno-freestanding", "" },
1274 { "-fcond-mismatch",
1275 N_("Allow different types as args of ? operator") },
1276 { "-fno-cond-mismatch", "" },
1277 { "-fdollars-in-identifiers",
1278 N_("Allow the use of $ inside identifiers") },
1279 { "-fno-dollars-in-identifiers", "" },
1280 { "-fpreprocessed", "" },
1281 { "-fno-preprocessed", "" },
1283 N_("Use the same size for double as for float") },
1284 { "-fno-short-double", "" },
1286 N_("Use the smallest fitting integer to hold enums") },
1287 { "-fno-short-enums", "" },
1289 N_("Override the underlying type for wchar_t to `unsigned short'") },
1290 { "-fno-short-wchar", "" },
1293 N_("Enable most warning messages") },
1294 { "-Wbad-function-cast",
1295 N_("Warn about casting functions to incompatible types") },
1296 { "-Wno-bad-function-cast", "" },
1297 { "-Wmissing-format-attribute",
1298 N_("Warn about functions which might be candidates for format attributes") },
1299 { "-Wno-missing-format-attribute", "" },
1301 N_("Warn about casts which discard qualifiers") },
1302 { "-Wno-cast-qual", "" },
1303 { "-Wchar-subscripts",
1304 N_("Warn about subscripts whose type is 'char'") },
1305 { "-Wno-char-subscripts", "" },
1307 N_("Warn if nested comments are detected") },
1308 { "-Wno-comment", "" },
1310 N_("Warn if nested comments are detected") },
1311 { "-Wno-comments", "" },
1313 N_("Warn about possibly confusing type conversions") },
1314 { "-Wno-conversion", "" },
1315 { "-Wdiv-by-zero", "" },
1316 { "-Wno-div-by-zero",
1317 N_("Do not warn about compile-time integer division by zero") },
1319 N_("Warn about testing equality of floating point numbers") },
1320 { "-Wno-float-equal", "" },
1322 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1323 { "-Wno-format", "" },
1324 { "-Wformat-extra-args", "" },
1325 { "-Wno-format-extra-args",
1326 N_("Don't warn about too many arguments to format functions") },
1327 { "-Wformat-nonliteral",
1328 N_("Warn about non-string-literal format strings") },
1329 { "-Wno-format-nonliteral", "" },
1330 { "-Wformat-security",
1331 N_("Warn about possible security problems with format functions") },
1332 { "-Wno-format-security", "" },
1333 { "-Wformat-y2k", "" },
1334 { "-Wno-format-y2k",
1335 N_("Don't warn about strftime formats yielding 2 digit years") },
1336 { "-Wimplicit-function-declaration",
1337 N_("Warn about implicit function declarations") },
1338 { "-Wno-implicit-function-declaration", "" },
1339 { "-Werror-implicit-function-declaration", "" },
1341 N_("Warn when a declaration does not specify a type") },
1342 { "-Wno-implicit-int", "" },
1343 { "-Wimplicit", "" },
1344 { "-Wno-implicit", "" },
1346 N_("Warn about the use of the #import directive") },
1347 { "-Wno-import", "" },
1349 N_("Warn about PCH files that are found but not used") },
1350 { "-Wlong-long","" },
1352 N_("Do not warn about using 'long long' when -pedantic") },
1354 N_("Warn about suspicious declarations of main") },
1355 { "-Wno-main", "" },
1356 { "-Wmissing-braces",
1357 N_("Warn about possibly missing braces around initializers") },
1358 { "-Wno-missing-braces", "" },
1359 { "-Wmissing-declarations",
1360 N_("Warn about global funcs without previous declarations") },
1361 { "-Wno-missing-declarations", "" },
1362 { "-Wmissing-prototypes",
1363 N_("Warn about global funcs without prototypes") },
1364 { "-Wno-missing-prototypes", "" },
1366 N_("Warn about use of multicharacter literals") },
1367 { "-Wno-multichar", "" },
1368 { "-Wnested-externs",
1369 N_("Warn about externs not at file scope level") },
1370 { "-Wno-nested-externs", "" },
1372 N_("Warn about possible missing parentheses") },
1373 { "-Wno-parentheses", "" },
1374 { "-Wpointer-arith",
1375 N_("Warn about function pointer arithmetic") },
1376 { "-Wno-pointer-arith", "" },
1377 { "-Wredundant-decls",
1378 N_("Warn about multiple declarations of the same object") },
1379 { "-Wno-redundant-decls", "" },
1381 N_("Warn whenever a function's return-type defaults to int") },
1382 { "-Wno-return-type", "" },
1383 { "-Wsequence-point",
1384 N_("Warn about possible violations of sequence point rules") },
1385 { "-Wno-sequence-point", "" },
1387 N_("Warn about signed/unsigned comparisons") },
1388 { "-Wno-sign-compare", "" },
1389 { "-Wstrict-prototypes",
1390 N_("Warn about non-prototyped function decls") },
1391 { "-Wno-strict-prototypes", "" },
1393 N_("Warn about constructs whose meanings change in ISO C") },
1394 { "-Wno-traditional", "" },
1396 N_("Warn when trigraphs are encountered") },
1397 { "-Wno-trigraphs", "" },
1399 { "-Wno-undef", "" },
1400 { "-Wunknown-pragmas",
1401 N_("Warn about unrecognized pragmas") },
1402 { "-Wno-unknown-pragmas", "" },
1403 { "-Wwrite-strings",
1404 N_("Mark strings as 'const char *'") },
1405 { "-Wno-write-strings", "" },
1407 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1409 #include "options.h"
1413 /* Here is a table, controlled by the tm.h file, listing each -m switch
1414 and which bits in `target_switches' it should set or clear.
1415 If VALUE is positive, it is bits to set.
1416 If VALUE is negative, -VALUE is bits to clear.
1417 (The sign bit is not used so there is no confusion.) */
1421 const char *const name;
1423 const char *const description;
1425 target_switches[] = TARGET_SWITCHES;
1427 /* This table is similar, but allows the switch to have a value. */
1429 #ifdef TARGET_OPTIONS
1432 const char *const prefix;
1433 const char **const variable;
1434 const char *const description;
1435 const char *const value;
1437 target_options[] = TARGET_OPTIONS;
1440 /* Options controlling warnings. */
1442 /* Don't print warning messages. -w. */
1444 int inhibit_warnings = 0;
1446 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1448 int warn_system_headers = 0;
1450 /* Print various extra warnings. -W/-Wextra. */
1452 int extra_warnings = 0;
1454 /* Treat warnings as errors. -Werror. */
1456 int warnings_are_errors = 0;
1458 /* Nonzero to warn about unused variables, functions et.al. */
1460 int warn_unused_function;
1461 int warn_unused_label;
1462 int warn_unused_parameter;
1463 int warn_unused_variable;
1464 int warn_unused_value;
1466 /* Nonzero to warn about code which is never reached. */
1468 int warn_notreached;
1470 /* Nonzero to warn about variables used before they are initialized. */
1472 int warn_uninitialized;
1474 /* Nonzero means warn about all declarations which shadow others. */
1478 /* Warn if a switch on an enum, that does not have a default case,
1479 fails to have a case for every enum value. */
1483 /* Warn if a switch does not have a default case. */
1485 int warn_switch_default;
1487 /* Warn if a switch on an enum fails to have a case for every enum
1488 value (regardless of the presence or otherwise of a default case). */
1490 int warn_switch_enum;
1492 /* Nonzero means warn about function definitions that default the return type
1493 or that use a null return and have a return-type other than void. */
1495 int warn_return_type;
1497 /* Nonzero means warn about pointer casts that increase the required
1498 alignment of the target type (and might therefore lead to a crash
1499 due to a misaligned access). */
1501 int warn_cast_align;
1503 /* Nonzero means warn about any objects definitions whose size is larger
1504 than N bytes. Also want about function definitions whose returned
1505 values are larger than N bytes. The value N is in `larger_than_size'. */
1507 int warn_larger_than;
1508 HOST_WIDE_INT larger_than_size;
1510 /* Nonzero means warn if inline function is too large. */
1514 /* Warn if a function returns an aggregate,
1515 since there are often incompatible calling conventions for doing this. */
1517 int warn_aggregate_return;
1519 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1523 /* Warn when gcc pads a structure to an alignment boundary. */
1527 /* Warn when an optimization pass is disabled. */
1529 int warn_disabled_optimization;
1531 /* Warn about functions which might be candidates for attribute noreturn. */
1533 int warn_missing_noreturn;
1535 /* Nonzero means warn about uses of __attribute__((deprecated))
1538 int warn_deprecated_decl = 1;
1540 /* Nonzero means warn about constructs which might not be
1541 strict-aliasing safe. */
1543 int warn_strict_aliasing;
1545 /* Like f_options, but for -W. */
1547 static const lang_independent_options W_options[] =
1549 {"unused-function", &warn_unused_function, 1,
1550 N_("Warn when a function is unused") },
1551 {"unused-label", &warn_unused_label, 1,
1552 N_("Warn when a label is unused") },
1553 {"unused-parameter", &warn_unused_parameter, 1,
1554 N_("Warn when a function parameter is unused") },
1555 {"unused-variable", &warn_unused_variable, 1,
1556 N_("Warn when a variable is unused") },
1557 {"unused-value", &warn_unused_value, 1,
1558 N_("Warn when an expression value is unused") },
1559 {"system-headers", &warn_system_headers, 1,
1560 N_("Do not suppress warnings from system headers") },
1561 {"error", &warnings_are_errors, 1,
1562 N_("Treat all warnings as errors") },
1563 {"shadow", &warn_shadow, 1,
1564 N_("Warn when one local variable shadows another") },
1565 {"switch", &warn_switch, 1,
1566 N_("Warn about enumerated switches, with no default, missing a case") },
1567 {"switch-default", &warn_switch_default, 1,
1568 N_("Warn about enumerated switches missing a default case") },
1569 {"switch-enum", &warn_switch_enum, 1,
1570 N_("Warn about all enumerated switches missing a specific case") },
1571 {"aggregate-return", &warn_aggregate_return, 1,
1572 N_("Warn about returning structures, unions or arrays") },
1573 {"cast-align", &warn_cast_align, 1,
1574 N_("Warn about pointer casts which increase alignment") },
1575 {"unreachable-code", &warn_notreached, 1,
1576 N_("Warn about code that will never be executed") },
1577 {"uninitialized", &warn_uninitialized, 1,
1578 N_("Warn about uninitialized automatic variables") },
1579 {"inline", &warn_inline, 1,
1580 N_("Warn when an inlined function cannot be inlined") },
1581 {"packed", &warn_packed, 1,
1582 N_("Warn when the packed attribute has no effect on struct layout") },
1583 {"padded", &warn_padded, 1,
1584 N_("Warn when padding is required to align struct members") },
1585 {"disabled-optimization", &warn_disabled_optimization, 1,
1586 N_("Warn when an optimization pass is disabled") },
1587 {"deprecated-declarations", &warn_deprecated_decl, 1,
1588 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1589 {"extra", &extra_warnings, 1,
1590 N_("Print extra (possibly unwanted) warnings") },
1591 {"missing-noreturn", &warn_missing_noreturn, 1,
1592 N_("Warn about functions which might be candidates for attribute noreturn") },
1593 {"strict-aliasing", &warn_strict_aliasing, 1,
1594 N_ ("Warn about code which might break the strict aliasing rules") }
1598 set_Wunused (setting)
1601 warn_unused_function = setting;
1602 warn_unused_label = setting;
1603 /* Unused function parameter warnings are reported when either ``-W
1604 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1605 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1607 warn_unused_parameter = 0;
1608 else if (!warn_unused_parameter)
1609 warn_unused_parameter = -1;
1610 warn_unused_variable = setting;
1611 warn_unused_value = setting;
1614 /* The following routines are useful in setting all the flags that
1615 -ffast-math and -fno-fast-math imply. */
1618 set_fast_math_flags (set)
1621 flag_trapping_math = !set;
1622 flag_unsafe_math_optimizations = set;
1623 flag_finite_math_only = set;
1624 flag_errno_math = !set;
1626 flag_signaling_nans = 0;
1629 /* Return true iff flags are set as if -ffast-math. */
1631 fast_math_flags_set_p ()
1633 return (!flag_trapping_math
1634 && flag_unsafe_math_optimizations
1635 && flag_finite_math_only
1636 && !flag_errno_math);
1640 /* Output files for assembler code (real compiler output)
1641 and debugging dumps. */
1644 FILE *aux_info_file;
1645 FILE *rtl_dump_file = NULL;
1647 /* Decode the string P as an integral parameter.
1648 If the string is indeed an integer return its numeric value else
1649 issue an Invalid Option error for the option PNAME and return DEFVAL.
1650 If PNAME is zero just return DEFVAL, do not call error. */
1653 read_integral_parameter (p, pname, defval)
1658 const char *endp = p;
1662 if (ISDIGIT (*endp))
1671 error ("invalid option argument `%s'", pname);
1678 /* This calls abort and is used to avoid problems when abort is a macro.
1679 It is used when we need to pass the address of abort. */
1687 /* When `malloc.c' is compiled with `rcheck' defined,
1688 it calls this function to report clobberage. */
1692 const char *s ATTRIBUTE_UNUSED;
1697 /* Return the logarithm of X, base 2, considering X unsigned,
1698 if X is a power of 2. Otherwise, returns -1.
1700 This should be used via the `exact_log2' macro. */
1704 unsigned HOST_WIDE_INT x;
1707 /* Test for 0 or a power of 2. */
1708 if (x == 0 || x != (x & -x))
1710 while ((x >>= 1) != 0)
1715 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1716 If X is 0, return -1.
1718 This should be used via the floor_log2 macro. */
1722 unsigned HOST_WIDE_INT x;
1731 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1732 into ICE messages, which is much more user friendly. */
1735 crash_signal (signo)
1738 internal_error ("%s", strsignal (signo));
1741 /* Arrange to dump core on error. (The regular error message is still
1742 printed first, except in the case of abort().) */
1745 setup_core_dumping ()
1748 signal (SIGABRT, SIG_DFL);
1750 #if defined(HAVE_SETRLIMIT)
1753 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1754 fatal_io_error ("getting core file size maximum limit");
1755 rlim.rlim_cur = rlim.rlim_max;
1756 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1757 fatal_io_error ("setting core file size limit to maximum");
1760 diagnostic_abort_on_error (global_dc);
1764 /* Strip off a legitimate source ending from the input string NAME of
1765 length LEN. Rather than having to know the names used by all of
1766 our front ends, we strip off an ending of a period followed by
1767 up to five characters. (Java uses ".class".) */
1770 strip_off_ending (name, len)
1775 for (i = 2; i < 6 && len > i; i++)
1777 if (name[len - i] == '.')
1779 name[len - i] = '\0';
1785 /* Output a quoted string. */
1788 output_quoted_string (asm_file, string)
1792 #ifdef OUTPUT_QUOTED_STRING
1793 OUTPUT_QUOTED_STRING (asm_file, string);
1797 putc ('\"', asm_file);
1798 while ((c = *string++) != 0)
1802 if (c == '\"' || c == '\\')
1803 putc ('\\', asm_file);
1807 fprintf (asm_file, "\\%03o", (unsigned char) c);
1809 putc ('\"', asm_file);
1813 /* Output NAME into FILE after having turned it into something
1814 usable as an identifier in a target's assembly file. */
1816 output_clean_symbol_name (file, name)
1820 /* Make a copy of NAME. */
1821 char *id = xstrdup (name);
1823 /* Make it look like a valid identifier for an assembler. */
1824 clean_symbol_name (id);
1831 /* Output a file name in the form wanted by System V. */
1834 output_file_directive (asm_file, input_name)
1836 const char *input_name;
1838 int len = strlen (input_name);
1839 const char *na = input_name + len;
1841 /* NA gets INPUT_NAME sans directory names. */
1842 while (na > input_name)
1844 if (IS_DIR_SEPARATOR (na[-1]))
1849 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1850 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1852 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1853 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1855 fprintf (asm_file, "\t.file\t");
1856 output_quoted_string (asm_file, na);
1857 fputc ('\n', asm_file);
1862 /* Routine to open a dump file. Return true if the dump file is enabled. */
1865 open_dump_file (index, decl)
1866 enum dump_file_index index;
1870 const char *open_arg;
1873 if (! dump_file[index].enabled)
1876 timevar_push (TV_DUMP);
1877 if (rtl_dump_file != NULL)
1878 fclose (rtl_dump_file);
1880 sprintf (seq, DUMPFILE_FORMAT, index);
1882 if (! dump_file[index].initialized)
1884 /* If we've not initialized the files, do so now. */
1885 if (graph_dump_format != no_graph
1886 && dump_file[index].graph_dump_p)
1888 dump_name = concat (seq, dump_file[index].extension, NULL);
1889 clean_graph_dump_file (dump_base_name, dump_name);
1892 dump_file[index].initialized = 1;
1898 dump_name = concat (dump_base_name, seq,
1899 dump_file[index].extension, NULL);
1901 rtl_dump_file = fopen (dump_name, open_arg);
1902 if (rtl_dump_file == NULL)
1903 fatal_io_error ("can't open %s", dump_name);
1908 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1909 (*lang_hooks.decl_printable_name) (decl, 2),
1910 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1912 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1913 ? " (unlikely executed)"
1916 timevar_pop (TV_DUMP);
1920 /* Routine to close a dump file. */
1923 close_dump_file (index, func, insns)
1924 enum dump_file_index index;
1925 void (*func) PARAMS ((FILE *, rtx));
1928 if (! rtl_dump_file)
1931 timevar_push (TV_DUMP);
1933 && graph_dump_format != no_graph
1934 && dump_file[index].graph_dump_p)
1939 sprintf (seq, DUMPFILE_FORMAT, index);
1940 suffix = concat (seq, dump_file[index].extension, NULL);
1941 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1946 func (rtl_dump_file, insns);
1948 fflush (rtl_dump_file);
1949 fclose (rtl_dump_file);
1951 rtl_dump_file = NULL;
1952 timevar_pop (TV_DUMP);
1955 /* Do any final processing required for the declarations in VEC, of
1956 which there are LEN. We write out inline functions and variables
1957 that have been deferred until this point, but which are required.
1958 Returns nonzero if anything was put out. */
1961 wrapup_global_declarations (vec, len)
1968 int output_something = 0;
1970 for (i = 0; i < len; i++)
1974 /* We're not deferring this any longer. Assignment is
1975 conditional to avoid needlessly dirtying PCH pages. */
1976 if (DECL_DEFER_OUTPUT (decl) != 0)
1977 DECL_DEFER_OUTPUT (decl) = 0;
1979 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1980 (*lang_hooks.finish_incomplete_decl) (decl);
1983 /* Now emit any global variables or functions that we have been
1984 putting off. We need to loop in case one of the things emitted
1985 here references another one which comes earlier in the list. */
1989 for (i = 0; i < len; i++)
1993 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1996 /* Don't write out static consts, unless we still need them.
1998 We also keep static consts if not optimizing (for debugging),
1999 unless the user specified -fno-keep-static-consts.
2000 ??? They might be better written into the debug information.
2001 This is possible when using DWARF.
2003 A language processor that wants static constants to be always
2004 written out (even if it is not used) is responsible for
2005 calling rest_of_decl_compilation itself. E.g. the C front-end
2006 calls rest_of_decl_compilation from finish_decl.
2007 One motivation for this is that is conventional in some
2008 environments to write things like:
2009 static const char rcsid[] = "... version string ...";
2010 intending to force the string to be in the executable.
2012 A language processor that would prefer to have unneeded
2013 static constants "optimized away" would just defer writing
2014 them out until here. E.g. C++ does this, because static
2015 constants are often defined in header files.
2017 ??? A tempting alternative (for both C and C++) would be
2018 to force a constant to be written if and only if it is
2019 defined in a main file, as opposed to an include file. */
2021 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2025 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2027 else if (DECL_COMDAT (decl))
2029 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
2030 && (optimize || !flag_keep_static_consts
2031 || DECL_ARTIFICIAL (decl)))
2037 rest_of_decl_compilation (decl, NULL, 1, 1);
2041 if (TREE_CODE (decl) == FUNCTION_DECL
2042 && DECL_INITIAL (decl) != 0
2043 && DECL_SAVED_INSNS (decl) != 0
2044 && (flag_keep_inline_functions
2045 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2046 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2049 output_inline_function (decl);
2054 output_something = 1;
2058 return output_something;
2061 /* Issue appropriate warnings for the global declarations in VEC (of
2062 which there are LEN). Output debugging information for them. */
2065 check_global_declarations (vec, len)
2072 for (i = 0; i < len; i++)
2076 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2077 && ! TREE_ASM_WRITTEN (decl))
2078 /* Cancel the RTL for this decl so that, if debugging info
2079 output for global variables is still to come,
2080 this one will be omitted. */
2081 SET_DECL_RTL (decl, NULL_RTX);
2083 /* Warn about any function
2084 declared static but not defined.
2085 We don't warn about variables,
2086 because many programs have static variables
2087 that exist only to get some text into the object file. */
2088 if (TREE_CODE (decl) == FUNCTION_DECL
2089 && (warn_unused_function
2090 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2091 && DECL_INITIAL (decl) == 0
2092 && DECL_EXTERNAL (decl)
2093 && ! DECL_ARTIFICIAL (decl)
2094 && ! TREE_PUBLIC (decl))
2096 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2097 pedwarn_with_decl (decl,
2098 "`%s' used but never defined");
2100 warning_with_decl (decl,
2101 "`%s' declared `static' but never defined");
2102 /* This symbol is effectively an "extern" declaration now. */
2103 TREE_PUBLIC (decl) = 1;
2104 assemble_external (decl);
2107 /* Warn about static fns or vars defined but not used. */
2108 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2109 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2110 && ! TREE_USED (decl)
2111 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2112 to handle multiple external decls in different scopes. */
2113 && ! TREE_USED (DECL_NAME (decl))
2114 && ! DECL_EXTERNAL (decl)
2115 && ! TREE_PUBLIC (decl)
2116 /* Global register variables must be declared to reserve them. */
2117 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2118 /* Otherwise, ask the language. */
2119 && (*lang_hooks.decls.warn_unused_global) (decl))
2120 warning_with_decl (decl, "`%s' defined but not used");
2122 /* Avoid confusing the debug information machinery when there are
2124 if (errorcount == 0 && sorrycount == 0)
2126 timevar_push (TV_SYMOUT);
2127 (*debug_hooks->global_decl) (decl);
2128 timevar_pop (TV_SYMOUT);
2133 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2134 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2135 INPUT_FILENAME and LINENO accordingly. */
2138 push_srcloc (file, line)
2142 struct file_stack *fs;
2144 if (input_file_stack)
2145 input_file_stack->location = input_location;
2147 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2148 input_filename = file;
2150 fs->location = input_location;
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)
2171 input_location = input_file_stack->location;
2174 input_filename = NULL;
2179 /* Compile an entire translation unit. Write a file of assembly
2180 output and various debugging dumps. */
2185 /* Initialize yet another pass. */
2187 init_final (main_input_filename);
2188 coverage_init (aux_base_name);
2190 timevar_push (TV_PARSE);
2192 /* Call the parser, which parses the entire file (calling
2193 rest_of_compilation for each function). */
2194 (*lang_hooks.parse_file) (set_yydebug);
2196 /* In case there were missing block closers,
2197 get us back to the global binding level. */
2198 (*lang_hooks.clear_binding_stack) ();
2200 /* Compilation is now finished except for writing
2201 what's left of the symbol table output. */
2202 timevar_pop (TV_PARSE);
2204 if (flag_syntax_only)
2207 (*lang_hooks.decls.final_write_globals)();
2209 /* This must occur after the loop to output deferred functions.
2210 Else the coverage initializer would not be emitted if all the
2211 functions in this compilation unit were deferred. */
2214 /* Write out any pending weak symbol declarations. */
2218 /* Do dbx symbols. */
2219 timevar_push (TV_SYMOUT);
2221 #ifdef DWARF2_UNWIND_INFO
2222 if (dwarf2out_do_frame ())
2223 dwarf2out_frame_finish ();
2226 (*debug_hooks->finish) (main_input_filename);
2227 timevar_pop (TV_SYMOUT);
2229 /* Output some stuff at end of file if nec. */
2231 dw2_output_indirect_constants ();
2233 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2235 timevar_push (TV_DUMP);
2236 open_dump_file (DFI_bp, NULL);
2240 close_dump_file (DFI_bp, NULL, NULL_RTX);
2241 timevar_pop (TV_DUMP);
2245 ASM_FILE_END (asm_out_file);
2248 /* Attach a special .ident directive to the end of the file to identify
2249 the version of GCC which compiled this code. The format of the .ident
2250 string is patterned after the ones produced by native SVR4 compilers. */
2253 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2254 IDENT_ASM_OP, version_string);
2257 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2259 timevar_push (TV_DUMP);
2260 dump_combine_total_stats (rtl_dump_file);
2261 close_dump_file (DFI_combine, NULL, NULL_RTX);
2262 timevar_pop (TV_DUMP);
2266 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2267 and TYPE_DECL nodes.
2269 This does nothing for local (non-static) variables, unless the
2270 variable is a register variable with an ASMSPEC. In that case, or
2271 if the variable is not an automatic, it sets up the RTL and
2272 outputs any assembler code (label definition, storage allocation
2273 and initialization).
2275 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2276 the assembler symbol name to be used. TOP_LEVEL is nonzero
2277 if this declaration is not within a function. */
2280 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2282 const char *asmspec;
2286 /* We deferred calling assemble_alias so that we could collect
2287 other attributes such as visibility. Emit the alias now. */
2290 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2293 alias = TREE_VALUE (TREE_VALUE (alias));
2294 alias = get_identifier (TREE_STRING_POINTER (alias));
2295 assemble_alias (decl, alias);
2299 /* Forward declarations for nested functions are not "external",
2300 but we need to treat them as if they were. */
2301 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2302 || TREE_CODE (decl) == FUNCTION_DECL)
2304 timevar_push (TV_VARCONST);
2307 make_decl_rtl (decl, asmspec);
2309 /* Don't output anything when a tentative file-scope definition
2310 is seen. But at end of compilation, do output code for them. */
2311 if (at_end || !DECL_DEFER_OUTPUT (decl))
2312 assemble_variable (decl, top_level, at_end, 0);
2314 #ifdef ASM_FINISH_DECLARE_OBJECT
2315 if (decl == last_assemble_variable_decl)
2317 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2322 timevar_pop (TV_VARCONST);
2324 else if (DECL_REGISTER (decl) && asmspec != 0)
2326 if (decode_reg_name (asmspec) >= 0)
2328 SET_DECL_RTL (decl, NULL_RTX);
2329 make_decl_rtl (decl, asmspec);
2333 error ("invalid register name `%s' for register variable", asmspec);
2334 DECL_REGISTER (decl) = 0;
2339 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2340 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2341 && TREE_CODE (decl) == TYPE_DECL)
2343 timevar_push (TV_SYMOUT);
2344 dbxout_symbol (decl, 0);
2345 timevar_pop (TV_SYMOUT);
2348 #ifdef SDB_DEBUGGING_INFO
2349 else if (write_symbols == SDB_DEBUG && top_level
2350 && TREE_CODE (decl) == TYPE_DECL)
2352 timevar_push (TV_SYMOUT);
2353 sdbout_symbol (decl, 0);
2354 timevar_pop (TV_SYMOUT);
2357 #ifdef DWARF2_DEBUGGING_INFO
2358 else if ((write_symbols == DWARF2_DEBUG
2359 || write_symbols == VMS_AND_DWARF2_DEBUG)
2361 && TREE_CODE (decl) == TYPE_DECL)
2363 timevar_push (TV_SYMOUT);
2364 dwarf2out_decl (decl);
2365 timevar_pop (TV_SYMOUT);
2370 /* Called after finishing a record, union or enumeral type. */
2373 rest_of_type_compilation (type, toplev)
2374 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2375 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2379 tree type ATTRIBUTE_UNUSED;
2380 int toplev ATTRIBUTE_UNUSED;
2383 /* Avoid confusing the debug information machinery when there are
2385 if (errorcount != 0 || sorrycount != 0)
2388 timevar_push (TV_SYMOUT);
2389 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2390 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2391 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2393 #ifdef SDB_DEBUGGING_INFO
2394 if (write_symbols == SDB_DEBUG)
2395 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2397 #ifdef DWARF2_DEBUGGING_INFO
2398 if ((write_symbols == DWARF2_DEBUG
2399 || write_symbols == VMS_AND_DWARF2_DEBUG)
2401 dwarf2out_decl (TYPE_STUB_DECL (type));
2403 timevar_pop (TV_SYMOUT);
2406 /* This is called from finish_function (within langhooks.parse_file)
2407 after each top-level definition is parsed.
2408 It is supposed to compile that function or variable
2409 and output the assembler code for it.
2410 After we return, the tree storage is freed. */
2413 rest_of_compilation (decl)
2419 int rebuild_label_notes_after_reload;
2421 timevar_push (TV_REST_OF_COMPILATION);
2423 /* Now that we're out of the frontend, we shouldn't have any more
2424 CONCATs anywhere. */
2425 generating_concat_p = 0;
2427 /* When processing delayed functions, prepare_function_start() won't
2428 have been run to re-initialize it. */
2429 cse_not_expected = ! optimize;
2431 /* First, make sure that NOTE_BLOCK is set correctly for each
2432 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2433 if (!cfun->x_whole_function_mode_p)
2436 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2437 tree in sensible shape. So, we just recalculate it here. */
2438 if (cfun->x_whole_function_mode_p)
2443 /* If we are reconsidering an inline function
2444 at the end of compilation, skip the stuff for making it inline. */
2446 if (DECL_SAVED_INSNS (decl) == 0)
2452 /* If this is nested inside an inlined external function, pretend
2453 it was only declared. Since we cannot inline such functions,
2454 generating code for this one is not only not necessary but will
2455 confuse some debugging output writers. */
2456 for (parent = DECL_CONTEXT (current_function_decl);
2457 parent != NULL_TREE;
2458 parent = get_containing_scope (parent))
2459 if (TREE_CODE (parent) == FUNCTION_DECL
2460 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2462 DECL_INITIAL (decl) = 0;
2463 goto exit_rest_of_compilation;
2465 else if (TYPE_P (parent))
2466 /* A function in a local class should be treated normally. */
2469 /* If requested, consider whether to make this function inline. */
2470 if ((DECL_INLINE (decl) && !flag_no_inline)
2471 || flag_inline_functions)
2473 timevar_push (TV_INTEGRATION);
2474 lose = function_cannot_inline_p (decl);
2475 timevar_pop (TV_INTEGRATION);
2476 if (lose || ! optimize)
2478 if (warn_inline && DECL_INLINE (decl))
2479 warning_with_decl (decl, lose);
2480 DECL_ABSTRACT_ORIGIN (decl) = 0;
2481 /* Don't really compile an extern inline function.
2482 If we can't make it inline, pretend
2483 it was only declared. */
2484 if (DECL_EXTERNAL (decl))
2486 DECL_INITIAL (decl) = 0;
2487 goto exit_rest_of_compilation;
2491 /* ??? Note that we used to just make it look like if
2492 the "inline" keyword was specified when we decide
2493 to inline it (because of -finline-functions).
2494 garloff@suse.de, 2002-04-24: Add another flag to
2495 actually record this piece of information. */
2496 if (!DECL_INLINE (decl))
2497 DID_INLINE_FUNC (decl) = 1;
2498 inlinable = DECL_INLINE (decl) = 1;
2502 insns = get_insns ();
2504 /* Dump the rtl code if we are dumping rtl. */
2506 if (open_dump_file (DFI_rtl, decl))
2508 if (DECL_SAVED_INSNS (decl))
2509 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2510 close_dump_file (DFI_rtl, print_rtl, insns);
2513 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2514 sorts of eh initialization. Delay this until after the
2515 initial rtl dump so that we can see the original nesting. */
2516 convert_from_eh_region_ranges ();
2518 /* If function is inline, and we don't yet know whether to
2519 compile it by itself, defer decision till end of compilation.
2520 wrapup_global_declarations will (indirectly) call
2521 rest_of_compilation again for those functions that need to
2522 be output. Also defer those functions that we are supposed
2526 || (DECL_INLINE (decl)
2527 && flag_inline_functions
2528 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2529 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2530 && ! flag_keep_inline_functions)
2531 || DECL_EXTERNAL (decl))))
2532 DECL_DEFER_OUTPUT (decl) = 1;
2534 if (DECL_INLINE (decl))
2535 /* DWARF wants separate debugging info for abstract and
2536 concrete instances of all inline functions, including those
2537 declared inline but not inlined, and those inlined even
2538 though they weren't declared inline. Conveniently, that's
2539 what DECL_INLINE means at this point. */
2540 (*debug_hooks->deferred_inline_function) (decl);
2542 if (DECL_DEFER_OUTPUT (decl))
2544 /* If -Wreturn-type, we have to do a bit of compilation. We just
2545 want to call cleanup the cfg to figure out whether or not we can
2546 fall off the end of the function; we do the minimum amount of
2547 work necessary to make that safe. */
2548 if (warn_return_type)
2550 int saved_optimize = optimize;
2553 rebuild_jump_labels (insns);
2554 find_exception_handler_labels ();
2555 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2556 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2557 optimize = saved_optimize;
2559 /* CFG is no longer maintained up-to-date. */
2560 free_bb_for_insn ();
2563 set_nothrow_function_flags ();
2564 if (current_function_nothrow)
2565 /* Now we know that this can't throw; set the flag for the benefit
2566 of other functions later in this translation unit. */
2567 TREE_NOTHROW (current_function_decl) = 1;
2569 timevar_push (TV_INTEGRATION);
2570 save_for_inline (decl);
2571 timevar_pop (TV_INTEGRATION);
2572 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2573 goto exit_rest_of_compilation;
2576 /* If specified extern inline but we aren't inlining it, we are
2577 done. This goes for anything that gets here with DECL_EXTERNAL
2578 set, not just things with DECL_INLINE. */
2579 if (DECL_EXTERNAL (decl))
2580 goto exit_rest_of_compilation;
2583 /* If we're emitting a nested function, make sure its parent gets
2584 emitted as well. Doing otherwise confuses debug info. */
2587 for (parent = DECL_CONTEXT (current_function_decl);
2588 parent != NULL_TREE;
2589 parent = get_containing_scope (parent))
2590 if (TREE_CODE (parent) == FUNCTION_DECL)
2591 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2594 /* We are now committed to emitting code for this function. Do any
2595 preparation, such as emitting abstract debug info for the inline
2596 before it gets mangled by optimization. */
2597 if (DECL_INLINE (decl))
2598 (*debug_hooks->outlining_inline_function) (decl);
2600 /* Remove any notes we don't need. That will make iterating
2601 over the instruction sequence faster, and allow the garbage
2602 collector to reclaim the memory used by the notes. */
2603 remove_unnecessary_notes ();
2608 /* Initialize some variables used by the optimizers. */
2609 init_function_for_compilation ();
2611 if (! DECL_DEFER_OUTPUT (decl))
2612 TREE_ASM_WRITTEN (decl) = 1;
2614 /* Now that integrate will no longer see our rtl, we need not
2615 distinguish between the return value of this function and the
2616 return value of called functions. Also, we can remove all SETs
2617 of subregs of hard registers; they are only here because of
2618 integrate. Also, we can now initialize pseudos intended to
2619 carry magic hard reg data throughout the function. */
2620 rtx_equal_function_value_matters = 0;
2621 purge_hard_subreg_sets (get_insns ());
2623 /* Early return if there were errors. We can run afoul of our
2624 consistency checks, and there's not really much point in fixing them.
2625 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2626 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2627 || errorcount || sorrycount)
2628 goto exit_rest_of_compilation;
2630 timevar_push (TV_JUMP);
2631 open_dump_file (DFI_sibling, decl);
2632 insns = get_insns ();
2633 rebuild_jump_labels (insns);
2634 find_exception_handler_labels ();
2635 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2637 delete_unreachable_blocks ();
2639 /* We have to issue these warnings now already, because CFG cleanups
2640 further down may destroy the required information. */
2641 check_function_return_warnings ();
2643 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2644 if (flag_guess_branch_prob)
2646 timevar_push (TV_BRANCH_PROB);
2647 note_prediction_to_br_prob ();
2648 timevar_pop (TV_BRANCH_PROB);
2651 /* We may have potential sibling or tail recursion sites. Select one
2652 (of possibly multiple) methods of performing the call. */
2653 if (flag_optimize_sibling_calls)
2656 optimize_sibling_and_tail_recursive_calls ();
2658 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2659 free_bb_for_insn ();
2660 find_exception_handler_labels ();
2661 rebuild_jump_labels (insns);
2662 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2664 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2665 notes before simplifying cfg and we must do lowering after sibcall
2666 that unhides parts of RTL chain and cleans up the CFG.
2668 Until sibcall is replaced by tree-level optimizer, lets just
2669 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2670 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2671 if (GET_CODE (insn) == NOTE
2672 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2675 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2676 timevar_pop (TV_JUMP);
2678 scope_to_insns_initialize ();
2679 /* Complete generation of exception handling code. */
2682 timevar_push (TV_JUMP);
2683 open_dump_file (DFI_eh, decl);
2685 finish_eh_generation ();
2687 close_dump_file (DFI_eh, print_rtl, get_insns ());
2688 timevar_pop (TV_JUMP);
2691 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2692 generation, which might create new sets. */
2693 emit_initial_value_sets ();
2696 /* If we are doing position-independent code generation, now
2697 is the time to output special prologues and epilogues.
2698 We do not want to do this earlier, because it just clutters
2699 up inline functions with meaningless insns. */
2704 insns = get_insns ();
2706 /* Copy any shared structure that should not be shared. */
2707 unshare_all_rtl (current_function_decl, insns);
2709 #ifdef SETJMP_VIA_SAVE_AREA
2710 /* This must be performed before virtual register instantiation.
2711 Please be aware the everything in the compiler that can look
2712 at the RTL up to this point must understand that REG_SAVE_AREA
2713 is just like a use of the REG contained inside. */
2714 if (current_function_calls_alloca)
2715 optimize_save_area_alloca (insns);
2718 /* Instantiate all virtual registers. */
2719 instantiate_virtual_regs (current_function_decl, insns);
2721 open_dump_file (DFI_jump, decl);
2723 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2724 are initialized and to compute whether control can drop off the end
2727 timevar_push (TV_JUMP);
2728 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2729 before jump optimization switches branch directions. */
2730 if (flag_guess_branch_prob)
2731 expected_value_to_br_prob ();
2733 reg_scan (insns, max_reg_num (), 0);
2734 rebuild_jump_labels (insns);
2735 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2736 delete_trivially_dead_insns (insns, max_reg_num ());
2738 dump_flow_info (rtl_dump_file);
2739 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2740 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2744 free_bb_for_insn ();
2745 copy_loop_headers (insns);
2746 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2748 purge_line_number_notes (insns);
2750 timevar_pop (TV_JUMP);
2751 close_dump_file (DFI_jump, print_rtl, insns);
2753 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2754 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2756 goto exit_rest_of_compilation;
2759 /* Long term, this should probably move before the jump optimizer too,
2760 but I didn't want to disturb the rtl_dump_and_exit and related
2761 stuff at this time. */
2762 if (optimize > 0 && flag_ssa)
2764 /* Convert to SSA form. */
2766 timevar_push (TV_TO_SSA);
2767 open_dump_file (DFI_ssa, decl);
2769 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2772 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2773 timevar_pop (TV_TO_SSA);
2775 /* Perform sparse conditional constant propagation, if requested. */
2778 timevar_push (TV_SSA_CCP);
2779 open_dump_file (DFI_ssa_ccp, decl);
2783 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2784 timevar_pop (TV_SSA_CCP);
2787 /* It would be useful to cleanup the CFG at this point, but block
2788 merging and possibly other transformations might leave a PHI
2789 node in the middle of a basic block, which is a strict no-no. */
2791 /* The SSA implementation uses basic block numbers in its phi
2792 nodes. Thus, changing the control-flow graph or the basic
2793 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2794 may cause problems. */
2798 /* Remove dead code. */
2800 timevar_push (TV_SSA_DCE);
2801 open_dump_file (DFI_ssa_dce, decl);
2803 insns = get_insns ();
2804 ssa_eliminate_dead_code ();
2806 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2807 timevar_pop (TV_SSA_DCE);
2810 /* Convert from SSA form. */
2812 timevar_push (TV_FROM_SSA);
2813 open_dump_file (DFI_ussa, decl);
2815 convert_from_ssa ();
2816 /* New registers have been created. Rescan their usage. */
2817 reg_scan (insns, max_reg_num (), 1);
2819 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2820 timevar_pop (TV_FROM_SSA);
2825 timevar_push (TV_JUMP);
2827 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2829 /* Try to identify useless null pointer tests and delete them. */
2830 if (flag_delete_null_pointer_checks)
2832 open_dump_file (DFI_null, decl);
2834 dump_flow_info (rtl_dump_file);
2836 if (delete_null_pointer_checks (insns))
2837 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2839 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2842 /* Jump optimization, and the removal of NULL pointer checks, may
2843 have reduced the number of instructions substantially. CSE, and
2844 future passes, allocate arrays whose dimensions involve the
2845 maximum instruction UID, so if we can reduce the maximum UID
2846 we'll save big on memory. */
2847 renumber_insns (rtl_dump_file);
2848 timevar_pop (TV_JUMP);
2850 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2854 /* Perform common subexpression elimination.
2855 Nonzero value from `cse_main' means that jumps were simplified
2856 and some code may now be unreachable, so do
2857 jump optimization again. */
2861 open_dump_file (DFI_cse, decl);
2863 dump_flow_info (rtl_dump_file);
2864 timevar_push (TV_CSE);
2866 reg_scan (insns, max_reg_num (), 1);
2868 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2870 rebuild_jump_labels (insns);
2871 purge_all_dead_edges (0);
2873 delete_trivially_dead_insns (insns, max_reg_num ());
2875 /* If we are not running more CSE passes, then we are no longer
2876 expecting CSE to be run. But always rerun it in a cheap mode. */
2877 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2879 if (tem || optimize > 1)
2880 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2881 /* Try to identify useless null pointer tests and delete them. */
2882 if (flag_delete_null_pointer_checks)
2884 timevar_push (TV_JUMP);
2886 if (delete_null_pointer_checks (insns))
2887 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2888 timevar_pop (TV_JUMP);
2891 /* The second pass of jump optimization is likely to have
2892 removed a bunch more instructions. */
2893 renumber_insns (rtl_dump_file);
2895 timevar_pop (TV_CSE);
2896 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2899 open_dump_file (DFI_addressof, decl);
2901 purge_addressof (insns);
2903 purge_all_dead_edges (0);
2904 reg_scan (insns, max_reg_num (), 1);
2906 close_dump_file (DFI_addressof, print_rtl, insns);
2910 /* Perform global cse. */
2912 if (optimize > 0 && flag_gcse)
2914 int save_csb, save_cfj;
2917 timevar_push (TV_GCSE);
2918 open_dump_file (DFI_gcse, decl);
2920 tem = gcse_main (insns, rtl_dump_file);
2921 rebuild_jump_labels (insns);
2922 delete_trivially_dead_insns (insns, max_reg_num ());
2924 save_csb = flag_cse_skip_blocks;
2925 save_cfj = flag_cse_follow_jumps;
2926 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2928 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2929 if (current_function_calls_constant_p)
2930 purge_builtin_constant_p ();
2932 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2934 if (flag_expensive_optimizations)
2936 timevar_push (TV_CSE);
2937 reg_scan (insns, max_reg_num (), 1);
2938 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2939 purge_all_dead_edges (0);
2940 delete_trivially_dead_insns (insns, max_reg_num ());
2941 timevar_pop (TV_CSE);
2942 cse_not_expected = !flag_rerun_cse_after_loop;
2945 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2946 things up. Then possibly re-run CSE again. */
2950 timevar_push (TV_JUMP);
2951 rebuild_jump_labels (insns);
2952 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2953 timevar_pop (TV_JUMP);
2955 if (flag_expensive_optimizations)
2957 timevar_push (TV_CSE);
2958 reg_scan (insns, max_reg_num (), 1);
2959 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2960 purge_all_dead_edges (0);
2961 delete_trivially_dead_insns (insns, max_reg_num ());
2962 timevar_pop (TV_CSE);
2966 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2967 timevar_pop (TV_GCSE);
2970 flag_cse_skip_blocks = save_csb;
2971 flag_cse_follow_jumps = save_cfj;
2972 #ifdef ENABLE_CHECKING
2973 verify_flow_info ();
2977 /* Move constant computations out of loops. */
2979 if (optimize > 0 && flag_loop_optimize)
2981 int do_unroll, do_prefetch;
2983 timevar_push (TV_LOOP);
2984 delete_dead_jumptables ();
2985 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2986 open_dump_file (DFI_loop, decl);
2987 /* CFG is no longer maintained up-to-date. */
2988 free_bb_for_insn ();
2990 if (flag_unroll_loops)
2991 do_unroll = 0; /* Having two unrollers is useless. */
2993 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2994 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2995 if (flag_rerun_loop_opt)
2997 cleanup_barriers ();
2999 /* We only want to perform unrolling once. */
3000 loop_optimize (insns, rtl_dump_file, do_unroll);
3003 /* The first call to loop_optimize makes some instructions
3004 trivially dead. We delete those instructions now in the
3005 hope that doing so will make the heuristics in loop work
3006 better and possibly speed up compilation. */
3007 delete_trivially_dead_insns (insns, max_reg_num ());
3009 /* The regscan pass is currently necessary as the alias
3010 analysis code depends on this information. */
3011 reg_scan (insns, max_reg_num (), 1);
3013 cleanup_barriers ();
3014 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3016 /* Loop can create trivially dead instructions. */
3017 delete_trivially_dead_insns (insns, max_reg_num ());
3018 close_dump_file (DFI_loop, print_rtl, insns);
3019 timevar_pop (TV_LOOP);
3020 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3025 /* Perform jump bypassing and control flow optimizations. */
3026 if (optimize > 0 && flag_gcse)
3028 timevar_push (TV_BYPASS);
3029 open_dump_file (DFI_bypass, decl);
3031 cleanup_cfg (CLEANUP_EXPENSIVE);
3032 tem = bypass_jumps (rtl_dump_file);
3036 rebuild_jump_labels (insns);
3037 cleanup_cfg (CLEANUP_EXPENSIVE);
3038 delete_trivially_dead_insns (insns, max_reg_num ());
3041 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
3042 timevar_pop (TV_BYPASS);
3046 #ifdef ENABLE_CHECKING
3047 verify_flow_info ();
3051 /* Do control and data flow analysis; wrote some of the results to
3054 timevar_push (TV_FLOW);
3055 open_dump_file (DFI_cfg, decl);
3057 dump_flow_info (rtl_dump_file);
3059 cleanup_cfg (CLEANUP_EXPENSIVE
3060 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3062 /* It may make more sense to mark constant functions after dead code is
3063 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3064 may insert code making function non-constant, but we still must consider
3065 it as constant, otherwise -fbranch-probabilities will not read data back.
3067 life_analysis rarely eliminates modification of external memory.
3070 mark_constant_function ();
3072 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3074 /* Do branch profiling and static profile estimation passes. */
3075 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3079 timevar_push (TV_BRANCH_PROB);
3080 open_dump_file (DFI_bp, decl);
3081 if (cfun->arc_profile || flag_branch_probabilities)
3084 /* Discover and record the loop depth at the head of each basic
3085 block. The loop infrastructure does the real job for us. */
3086 flow_loops_find (&loops, LOOP_TREE);
3089 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3091 /* Estimate using heuristics if no profiling info is available. */
3092 if (flag_guess_branch_prob)
3093 estimate_probability (&loops);
3095 flow_loops_free (&loops);
3096 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3097 timevar_pop (TV_BRANCH_PROB);
3101 open_dump_file (DFI_ce1, decl);
3102 if (flag_if_conversion)
3104 timevar_push (TV_IFCVT);
3106 dump_flow_info (rtl_dump_file);
3107 cleanup_cfg (CLEANUP_EXPENSIVE);
3108 reg_scan (insns, max_reg_num (), 0);
3110 timevar_pop (TV_IFCVT);
3112 timevar_push (TV_JUMP);
3113 cleanup_cfg (CLEANUP_EXPENSIVE);
3114 reg_scan (insns, max_reg_num (), 0);
3115 timevar_pop (TV_JUMP);
3116 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3120 timevar_push (TV_TRACER);
3121 open_dump_file (DFI_tracer, decl);
3123 dump_flow_info (rtl_dump_file);
3125 cleanup_cfg (CLEANUP_EXPENSIVE);
3126 reg_scan (insns, max_reg_num (), 0);
3127 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3128 timevar_pop (TV_TRACER);
3131 /* Perform loop optimalizations. It might be better to do them a bit
3132 sooner, but we want the profile feedback to work more efficiently. */
3134 && (flag_unswitch_loops
3136 || flag_unroll_loops))
3138 struct loops *loops;
3139 timevar_push (TV_LOOP);
3140 open_dump_file (DFI_loop2, decl);
3142 dump_flow_info (rtl_dump_file);
3144 loops = loop_optimizer_init (rtl_dump_file);
3148 /* The optimalizations: */
3149 if (flag_unswitch_loops)
3150 unswitch_loops (loops);
3152 if (flag_peel_loops || flag_unroll_loops)
3153 unroll_and_peel_loops (loops,
3154 (flag_peel_loops ? UAP_PEEL : 0) |
3155 (flag_unroll_loops ? UAP_UNROLL : 0) |
3156 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3158 loop_optimizer_finalize (loops, rtl_dump_file);
3161 cleanup_cfg (CLEANUP_EXPENSIVE);
3162 delete_trivially_dead_insns (insns, max_reg_num ());
3163 reg_scan (insns, max_reg_num (), 0);
3165 dump_flow_info (rtl_dump_file);
3166 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3167 timevar_pop (TV_LOOP);
3171 if (flag_rerun_cse_after_loop)
3173 timevar_push (TV_CSE2);
3174 open_dump_file (DFI_cse2, decl);
3176 dump_flow_info (rtl_dump_file);
3177 /* CFG is no longer maintained up-to-date. */
3178 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3179 purge_all_dead_edges (0);
3180 delete_trivially_dead_insns (insns, max_reg_num ());
3184 timevar_push (TV_JUMP);
3185 rebuild_jump_labels (insns);
3186 cleanup_cfg (CLEANUP_EXPENSIVE);
3187 timevar_pop (TV_JUMP);
3189 reg_scan (insns, max_reg_num (), 0);
3190 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3192 timevar_pop (TV_CSE2);
3195 cse_not_expected = 1;
3197 open_dump_file (DFI_life, decl);
3200 #ifdef ENABLE_CHECKING
3201 verify_flow_info ();
3203 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3205 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3206 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3207 timevar_pop (TV_FLOW);
3209 if (warn_uninitialized || extra_warnings)
3211 uninitialized_vars_warning (DECL_INITIAL (decl));
3213 setjmp_args_warning ();
3218 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3220 /* Insns were inserted, and possibly pseudos created, so
3221 things might look a bit different. */
3222 insns = get_insns ();
3223 allocate_reg_life_data ();
3224 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3225 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
3231 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3235 /* If -opt, try combining insns through substitution. */
3239 int rebuild_jump_labels_after_combine = 0;
3241 timevar_push (TV_COMBINE);
3242 open_dump_file (DFI_combine, decl);
3244 rebuild_jump_labels_after_combine
3245 = combine_instructions (insns, max_reg_num ());
3247 /* Combining insns may have turned an indirect jump into a
3248 direct jump. Rebuild the JUMP_LABEL fields of jumping
3250 if (rebuild_jump_labels_after_combine)
3252 timevar_push (TV_JUMP);
3253 rebuild_jump_labels (insns);
3254 timevar_pop (TV_JUMP);
3256 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3259 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3260 timevar_pop (TV_COMBINE);
3265 /* Rerun if-conversion, as combine may have simplified things enough to
3266 now meet sequence length restrictions. */
3267 if (flag_if_conversion)
3269 timevar_push (TV_IFCVT);
3270 open_dump_file (DFI_ce2, decl);
3276 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3277 timevar_pop (TV_IFCVT);
3280 /* Register allocation pre-pass, to reduce number of moves
3281 necessary for two-address machines. */
3282 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3284 timevar_push (TV_REGMOVE);
3285 open_dump_file (DFI_regmove, decl);
3287 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3289 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3290 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3291 timevar_pop (TV_REGMOVE);
3296 /* Do unconditional splitting before register allocation to allow machine
3297 description to add extra information not needed previously. */
3298 split_all_insns (1);
3300 #ifdef OPTIMIZE_MODE_SWITCHING
3301 timevar_push (TV_MODE_SWITCH);
3304 optimize_mode_switching (NULL);
3307 timevar_pop (TV_MODE_SWITCH);
3310 /* Any of the several passes since flow1 will have munged register
3311 lifetime data a bit. We need it to be up to date for scheduling
3312 (see handling of reg_known_equiv in init_alias_analysis). */
3313 recompute_reg_usage (insns, !optimize_size);
3315 timevar_push (TV_SCHED);
3317 #ifdef INSN_SCHEDULING
3319 /* Print function header into sched dump now
3320 because doing the sched analysis makes some of the dump. */
3321 if (optimize > 0 && flag_schedule_insns)
3323 open_dump_file (DFI_sched, decl);
3325 /* Do control and data sched analysis,
3326 and write some of the results to dump file. */
3328 schedule_insns (rtl_dump_file);
3330 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3333 timevar_pop (TV_SCHED);
3337 /* Determine if the current function is a leaf before running reload
3338 since this can impact optimizations done by the prologue and
3339 epilogue thus changing register elimination offsets. */
3340 current_function_is_leaf = leaf_function_p ();
3342 timevar_push (TV_LOCAL_ALLOC);
3343 open_dump_file (DFI_lreg, decl);
3345 /* Allocate pseudo-regs that are used only within 1 basic block.
3347 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3348 jump optimizer after register allocation and reloading are finished. */
3350 if (flag_new_regalloc)
3352 delete_trivially_dead_insns (insns, max_reg_num ());
3355 timevar_pop (TV_LOCAL_ALLOC);
3356 if (dump_file[DFI_lreg].enabled)
3358 timevar_push (TV_DUMP);
3360 close_dump_file (DFI_lreg, NULL, NULL);
3361 timevar_pop (TV_DUMP);
3364 /* XXX clean up the whole mess to bring live info in shape again. */
3365 timevar_push (TV_GLOBAL_ALLOC);
3366 open_dump_file (DFI_greg, decl);
3368 build_insn_chain (insns);
3369 failure = reload (insns, 0);
3371 timevar_pop (TV_GLOBAL_ALLOC);
3373 if (dump_file[DFI_greg].enabled)
3375 timevar_push (TV_DUMP);
3377 dump_global_regs (rtl_dump_file);
3379 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3380 timevar_pop (TV_DUMP);
3384 goto exit_rest_of_compilation;
3385 reload_completed = 1;
3386 rebuild_label_notes_after_reload = 0;
3390 /* Allocate the reg_renumber array. */
3391 allocate_reg_info (max_regno, FALSE, TRUE);
3393 /* And the reg_equiv_memory_loc array. */
3394 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3396 allocate_initial_values (reg_equiv_memory_loc);
3398 regclass (insns, max_reg_num (), rtl_dump_file);
3399 rebuild_label_notes_after_reload = local_alloc ();
3401 timevar_pop (TV_LOCAL_ALLOC);
3403 if (dump_file[DFI_lreg].enabled)
3405 timevar_push (TV_DUMP);
3407 dump_flow_info (rtl_dump_file);
3408 dump_local_alloc (rtl_dump_file);
3410 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3411 timevar_pop (TV_DUMP);
3416 timevar_push (TV_GLOBAL_ALLOC);
3417 open_dump_file (DFI_greg, decl);
3419 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3420 pass fixing up any insns that are invalid. */
3423 failure = global_alloc (rtl_dump_file);
3426 build_insn_chain (insns);
3427 failure = reload (insns, 0);
3430 timevar_pop (TV_GLOBAL_ALLOC);
3432 if (dump_file[DFI_greg].enabled)
3434 timevar_push (TV_DUMP);
3436 dump_global_regs (rtl_dump_file);
3438 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3439 timevar_pop (TV_DUMP);
3443 goto exit_rest_of_compilation;
3448 open_dump_file (DFI_postreload, decl);
3450 /* Do a very simple CSE pass over just the hard registers. */
3453 timevar_push (TV_RELOAD_CSE_REGS);
3454 reload_cse_regs (insns);
3455 timevar_pop (TV_RELOAD_CSE_REGS);
3458 /* Register allocation and reloading may have turned an indirect jump into
3459 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3460 jumping instructions. */
3461 if (rebuild_label_notes_after_reload)
3463 timevar_push (TV_JUMP);
3465 rebuild_jump_labels (insns);
3466 purge_all_dead_edges (0);
3468 timevar_pop (TV_JUMP);
3471 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3473 /* Re-create the death notes which were deleted during reload. */
3474 timevar_push (TV_FLOW2);
3475 open_dump_file (DFI_flow2, decl);
3477 #ifdef ENABLE_CHECKING
3478 verify_flow_info ();
3481 /* If optimizing, then go ahead and split insns now. */
3485 split_all_insns (0);
3488 cleanup_cfg (CLEANUP_EXPENSIVE);
3490 /* On some machines, the prologue and epilogue code, or parts thereof,
3491 can be represented as RTL. Doing so lets us schedule insns between
3492 it and the rest of the code and also allows delayed branch
3493 scheduling to operate in the epilogue. */
3494 thread_prologue_and_epilogue_insns (insns);
3498 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3499 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3500 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3502 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3503 even for machines with possibly nonzero RETURN_POPS_ARGS
3504 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3505 push instructions will have popping returns. */
3506 #ifndef PUSH_ROUNDING
3507 if (!ACCUMULATE_OUTGOING_ARGS)
3509 combine_stack_adjustments ();
3514 flow2_completed = 1;
3516 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3517 timevar_pop (TV_FLOW2);
3519 #ifdef HAVE_peephole2
3520 if (optimize > 0 && flag_peephole2)
3522 timevar_push (TV_PEEPHOLE2);
3523 open_dump_file (DFI_peephole2, decl);
3525 peephole2_optimize (rtl_dump_file);
3527 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3528 timevar_pop (TV_PEEPHOLE2);
3532 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3534 timevar_push (TV_RENAME_REGISTERS);
3535 open_dump_file (DFI_rnreg, decl);
3537 if (flag_rename_registers)
3538 regrename_optimize ();
3539 if (flag_cprop_registers)
3540 copyprop_hardreg_forward ();
3542 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3543 timevar_pop (TV_RENAME_REGISTERS);
3548 timevar_push (TV_REORDER_BLOCKS);
3549 open_dump_file (DFI_bbro, decl);
3551 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3552 splitting possibly introduced more crossjumping opportunities. */
3553 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3554 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3556 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
3558 if (flag_reorder_blocks)
3559 reorder_basic_blocks ();
3560 if (flag_reorder_blocks
3561 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
3562 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3564 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3565 timevar_pop (TV_REORDER_BLOCKS);
3568 if (flag_if_conversion2)
3570 timevar_push (TV_IFCVT2);
3571 open_dump_file (DFI_ce3, decl);
3575 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3576 timevar_pop (TV_IFCVT2);
3579 #ifdef INSN_SCHEDULING
3580 if (optimize > 0 && flag_schedule_insns_after_reload)
3582 timevar_push (TV_SCHED2);
3583 open_dump_file (DFI_sched2, decl);
3585 /* Do control and data sched analysis again,
3586 and write some more of the results to dump file. */
3588 split_all_insns (1);
3590 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
3592 schedule_ebbs (rtl_dump_file);
3593 /* No liveness updating code yet, but it should be easy to do.
3594 reg-stack recompute the liveness when needed for now. */
3595 count_or_remove_death_notes (NULL, 1);
3596 cleanup_cfg (CLEANUP_EXPENSIVE);
3599 schedule_insns (rtl_dump_file);
3601 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3602 timevar_pop (TV_SCHED2);
3608 #ifdef LEAF_REGISTERS
3609 current_function_uses_only_leaf_regs
3610 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3614 timevar_push (TV_REG_STACK);
3615 open_dump_file (DFI_stack, decl);
3617 if (reg_to_stack (insns, rtl_dump_file) && optimize)
3619 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3620 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
3621 && flag_reorder_blocks)
3623 reorder_basic_blocks ();
3624 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3628 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3629 timevar_pop (TV_REG_STACK);
3633 compute_alignments ();
3635 /* CFG is no longer maintained up-to-date. */
3636 free_bb_for_insn ();
3638 /* If a machine dependent reorganization is needed, call it. */
3639 #ifdef MACHINE_DEPENDENT_REORG
3640 timevar_push (TV_MACH_DEP);
3641 open_dump_file (DFI_mach, decl);
3643 MACHINE_DEPENDENT_REORG (insns);
3645 close_dump_file (DFI_mach, print_rtl, insns);
3646 timevar_pop (TV_MACH_DEP);
3651 purge_line_number_notes (insns);
3652 cleanup_barriers ();
3654 /* If a scheduling pass for delayed branches is to be done,
3655 call the scheduling code. */
3658 if (optimize > 0 && flag_delayed_branch)
3660 timevar_push (TV_DBR_SCHED);
3661 open_dump_file (DFI_dbr, decl);
3663 dbr_schedule (insns, rtl_dump_file);
3665 close_dump_file (DFI_dbr, print_rtl, insns);
3666 timevar_pop (TV_DBR_SCHED);
3672 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3673 timevar_push (TV_SHORTEN_BRANCH);
3674 split_all_insns_noflow ();
3675 timevar_pop (TV_SHORTEN_BRANCH);
3678 convert_to_eh_region_ranges ();
3680 /* Shorten branches. */
3681 timevar_push (TV_SHORTEN_BRANCH);
3682 shorten_branches (get_insns ());
3683 timevar_pop (TV_SHORTEN_BRANCH);
3685 set_nothrow_function_flags ();
3686 if (current_function_nothrow)
3687 /* Now we know that this can't throw; set the flag for the benefit
3688 of other functions later in this translation unit. */
3689 TREE_NOTHROW (current_function_decl) = 1;
3691 /* Now turn the rtl into assembler code. */
3693 timevar_push (TV_FINAL);
3698 /* Get the function's name, as described by its RTL. This may be
3699 different from the DECL_NAME name used in the source file. */
3701 x = DECL_RTL (decl);
3702 if (GET_CODE (x) != MEM)
3705 if (GET_CODE (x) != SYMBOL_REF)
3707 fnname = XSTR (x, 0);
3709 assemble_start_function (decl, fnname);
3710 final_start_function (insns, asm_out_file, optimize);
3711 final (insns, asm_out_file, optimize, 0);
3712 final_end_function ();
3714 #ifdef IA64_UNWIND_INFO
3715 /* ??? The IA-64 ".handlerdata" directive must be issued before
3716 the ".endp" directive that closes the procedure descriptor. */
3717 output_function_exception_table ();
3720 assemble_end_function (decl, fnname);
3722 #ifndef IA64_UNWIND_INFO
3723 /* Otherwise, it feels unclean to switch sections in the middle. */
3724 output_function_exception_table ();
3728 fflush (asm_out_file);
3730 /* Release all memory allocated by flow. */
3731 free_basic_block_vars (0);
3733 /* Release all memory held by regsets now. */
3734 regset_release_memory ();
3736 timevar_pop (TV_FINAL);
3740 /* Write DBX symbols if requested. */
3742 /* Note that for those inline functions where we don't initially
3743 know for certain that we will be generating an out-of-line copy,
3744 the first invocation of this routine (rest_of_compilation) will
3745 skip over this code by doing a `goto exit_rest_of_compilation;'.
3746 Later on, wrapup_global_declarations will (indirectly) call
3747 rest_of_compilation again for those inline functions that need
3748 to have out-of-line copies generated. During that call, we
3749 *will* be routed past here. */
3751 timevar_push (TV_SYMOUT);
3752 (*debug_hooks->function_decl) (decl);
3753 timevar_pop (TV_SYMOUT);
3755 exit_rest_of_compilation:
3757 coverage_end_function ();
3759 /* In case the function was not output,
3760 don't leave any temporary anonymous types
3761 queued up for sdb output. */
3762 #ifdef SDB_DEBUGGING_INFO
3763 if (write_symbols == SDB_DEBUG)
3764 sdbout_types (NULL_TREE);
3767 reload_completed = 0;
3768 flow2_completed = 0;
3771 timevar_push (TV_FINAL);
3773 /* Clear out the insn_length contents now that they are no
3775 init_insn_lengths ();
3777 /* Show no temporary slots allocated. */
3780 free_basic_block_vars (0);
3781 free_bb_for_insn ();
3783 timevar_pop (TV_FINAL);
3785 if ((*targetm.binds_local_p) (current_function_decl))
3787 int pref = cfun->preferred_stack_boundary;
3788 if (cfun->recursive_call_emit
3789 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3790 pref = cfun->stack_alignment_needed;
3791 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3795 /* Make sure volatile mem refs aren't considered valid operands for
3796 arithmetic insns. We must call this here if this is a nested inline
3797 function, since the above code leaves us in the init_recog state
3798 (from final.c), and the function context push/pop code does not
3799 save/restore volatile_ok.
3801 ??? Maybe it isn't necessary for expand_start_function to call this
3802 anymore if we do it here? */
3804 init_recog_no_volatile ();
3806 /* We're done with this function. Free up memory if we can. */
3807 free_after_parsing (cfun);
3808 if (! DECL_DEFER_OUTPUT (decl))
3810 free_after_compilation (cfun);
3812 /* Clear integrate.c's pointer to the cfun structure we just
3814 DECL_SAVED_INSNS (decl) = 0;
3820 timevar_pop (TV_REST_OF_COMPILATION);
3830 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3831 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3832 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3833 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3834 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3835 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"));
3836 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3837 printf (_(" -fstack-limit-register=<register> Trap if the stack goes past <register>\n"));
3838 printf (_(" -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>\n"));
3839 printf (_(" -frandom-seed=<string> Make compile reproducible using <string>\n"));
3842 for (i = ARRAY_SIZE (f_options); i--;)
3844 const char *description = f_options[i].description;
3846 if (description != NULL && *description != 0)
3847 printf (" -f%-21s %s\n",
3848 f_options[i].string, _(description));
3851 printf (_(" -O[number] Set optimization level to [number]\n"));
3852 printf (_(" -Os Optimize for space rather than speed\n"));
3853 for (i = LAST_PARAM; i--;)
3855 const char *description = compiler_params[i].help;
3856 const int length = 21 - strlen (compiler_params[i].option);
3858 if (description != NULL && *description != 0)
3859 printf (" --param %s=<value>%.*s%s\n",
3860 compiler_params[i].option,
3861 length > 0 ? length : 1, " ",
3864 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3865 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3866 printf (_(" -w Suppress warnings\n"));
3868 for (i = ARRAY_SIZE (W_options); i--;)
3870 const char *description = W_options[i].description;
3872 if (description != NULL && *description != 0)
3873 printf (" -W%-21s %s\n",
3874 W_options[i].string, _(description));
3877 printf (_(" -Wunused Enable unused warnings\n"));
3878 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3879 printf (_(" -p Enable function profiling\n"));
3880 printf (_(" -o <file> Place output into <file> \n"));
3882 -G <number> Put global and static data smaller than <number>\n\
3883 bytes into a special section (on some targets)\n"));
3885 for (i = ARRAY_SIZE (debug_args); i--;)
3887 if (debug_args[i].description != NULL)
3888 printf (" -g%-21s %s\n",
3889 debug_args[i].arg, _(debug_args[i].description));
3892 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3893 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3894 printf (_(" -version Display the compiler's version\n"));
3895 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3896 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3897 #if defined INSN_SCHEDULING
3898 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3900 printf (_(" --help Display this information\n"));
3905 /* Display descriptions of language specific options.
3906 If there is no description, note that there is an undocumented option.
3907 If the description is empty, do not display anything. (This allows
3908 options to be deliberately undocumented, for whatever reason).
3909 If the option string is missing, then this is a marker, indicating
3910 that the description string is in fact the name of a language, whose
3911 language specific options are to follow. */
3913 if (ARRAY_SIZE (documented_lang_options) > 1)
3915 printf (_("\nLanguage specific options:\n"));
3917 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3919 const char *description = documented_lang_options[i].description;
3920 const char *option = documented_lang_options[i].option;
3922 if (description == NULL)
3927 printf (_(" %-23.23s [undocumented]\n"), option);
3929 else if (*description == 0)
3931 else if (option == NULL)
3935 (_("\nThere are undocumented %s specific options as well.\n"),
3939 printf (_("\n Options for %s:\n"), description);
3944 printf (" %-23.23s %s\n", option, _(description));
3949 printf (_("\nThere are undocumented %s specific options as well.\n"),
3952 display_target_options ();
3956 display_target_options ()
3959 static bool displayed = false;
3961 /* Avoid double printing for --help --target-help. */
3966 if (ARRAY_SIZE (target_switches) > 1
3967 #ifdef TARGET_OPTIONS
3968 || ARRAY_SIZE (target_options) > 1
3976 printf (_("\nTarget specific options:\n"));
3978 for (i = ARRAY_SIZE (target_switches); i--;)
3980 const char *option = target_switches[i].name;
3981 const char *description = target_switches[i].description;
3983 if (option == NULL || *option == 0)
3985 else if (description == NULL)
3990 printf (_(" -m%-23.23s [undocumented]\n"), option);
3992 else if (*description != 0)
3993 doc += printf (" -m%-23.23s %s\n", option, _(description));
3996 #ifdef TARGET_OPTIONS
3997 for (i = ARRAY_SIZE (target_options); i--;)
3999 const char *option = target_options[i].prefix;
4000 const char *description = target_options[i].description;
4002 if (option == NULL || *option == 0)
4004 else if (description == NULL)
4009 printf (_(" -m%-23.23s [undocumented]\n"), option);
4011 else if (*description != 0)
4012 doc += printf (" -m%-23.23s %s\n", option, _(description));
4018 printf (_("\nThere are undocumented target specific options as well.\n"));
4020 printf (_(" They exist, but they are not documented.\n"));
4025 /* Parse a -d... command line switch. */
4028 decode_d_option (arg)
4037 for (i = 0; i < (int) DFI_MAX; ++i)
4038 dump_file[i].enabled = 1;
4044 flag_print_asm_name = 1;
4047 flag_dump_rtl_in_asm = 1;
4048 flag_print_asm_name = 1;
4051 graph_dump_format = vcg;
4054 rtl_dump_and_exit = 1;
4059 case 'D': /* These are handled by the preprocessor. */
4063 setup_core_dumping();
4068 for (i = 0; i < (int) DFI_MAX; ++i)
4069 if (c == dump_file[i].debug_switch)
4071 dump_file[i].enabled = 1;
4076 warning ("unrecognized gcc debugging option: %c", c);
4081 /* Parse a -f... command line switch. ARG is the value after the -f.
4082 It is safe to access 'ARG - 2' to generate the full switch name.
4083 Return the number of strings consumed. */
4086 decode_f_option (arg)
4090 const char *option_value = NULL;
4092 /* Search for the option in the table of binary f options. */
4093 for (j = ARRAY_SIZE (f_options); j--;)
4095 if (!strcmp (arg, f_options[j].string))
4097 *f_options[j].variable = f_options[j].on_value;
4101 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4102 && ! strcmp (arg + 3, f_options[j].string))
4104 *f_options[j].variable = ! f_options[j].on_value;
4109 if (!strcmp (arg, "fast-math"))
4110 set_fast_math_flags (1);
4111 else if (!strcmp (arg, "no-fast-math"))
4112 set_fast_math_flags (0);
4113 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4114 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4117 read_integral_parameter (option_value, arg - 2,
4119 set_param_value ("max-inline-insns", val);
4120 set_param_value ("max-inline-insns-single", val/2);
4121 set_param_value ("max-inline-insns-auto", val/2);
4122 set_param_value ("max-inline-insns-rtl", val);
4123 if (val/4 < MIN_INLINE_INSNS)
4126 set_param_value ("min-inline-insns", val/4);
4128 set_param_value ("min-inline-insns", 10);
4131 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4133 if (strcmp (option_value, "global-dynamic") == 0)
4134 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4135 else if (strcmp (option_value, "local-dynamic") == 0)
4136 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4137 else if (strcmp (option_value, "initial-exec") == 0)
4138 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4139 else if (strcmp (option_value, "local-exec") == 0)
4140 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4142 warning ("`%s': unknown tls-model option", arg - 2);
4144 #ifdef INSN_SCHEDULING
4145 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4146 fix_sched_param ("verbose", option_value);
4148 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4149 fix_register (option_value, 1, 1);
4150 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4151 fix_register (option_value, 0, 1);
4152 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4153 fix_register (option_value, 0, 0);
4154 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4155 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4156 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4158 = read_integral_parameter (option_value, arg - 2, align_functions);
4159 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4160 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4161 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4163 = read_integral_parameter (option_value, arg - 2, align_labels);
4164 else if ((option_value
4165 = skip_leading_substring (arg, "stack-limit-register=")))
4167 int reg = decode_reg_name (option_value);
4169 error ("unrecognized register name `%s'", option_value);
4171 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4173 else if ((option_value
4174 = skip_leading_substring (arg, "stack-limit-symbol=")))
4177 nm = ggc_strdup (option_value);
4178 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4180 else if ((option_value
4181 = skip_leading_substring (arg, "message-length=")))
4182 output_set_maximum_length
4183 (&global_dc->buffer, read_integral_parameter
4184 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4185 else if ((option_value
4186 = skip_leading_substring (arg, "diagnostics-show-location=")))
4188 if (!strcmp (option_value, "once"))
4189 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4190 else if (!strcmp (option_value, "every-line"))
4191 diagnostic_prefixing_rule (global_dc)
4192 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4194 error ("unrecognized option `%s'", arg - 2);
4196 else if (!strcmp (arg, "no-stack-limit"))
4197 stack_limit_rtx = NULL_RTX;
4198 else if ((option_value = skip_leading_substring (arg, "random-seed=")))
4199 flag_random_seed = option_value;
4200 else if (!strcmp (arg, "no-random-seed"))
4201 flag_random_seed = NULL;
4202 else if (!strcmp (arg, "preprocessed"))
4203 /* Recognize this switch but do nothing. This prevents warnings
4204 about an unrecognized switch if cpplib has not been linked in. */
4212 /* Parse a -W... command line switch. ARG is the value after the -W.
4213 It is safe to access 'ARG - 2' to generate the full switch name.
4214 Return the number of strings consumed. */
4217 decode_W_option (arg)
4220 const char *option_value = NULL;
4223 /* Search for the option in the table of binary W options. */
4225 for (j = ARRAY_SIZE (W_options); j--;)
4227 if (!strcmp (arg, W_options[j].string))
4229 *W_options[j].variable = W_options[j].on_value;
4233 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4234 && ! strcmp (arg + 3, W_options[j].string))
4236 *W_options[j].variable = ! W_options[j].on_value;
4241 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4242 warning ("-Wid-clash-LEN is no longer supported");
4243 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4245 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4247 warn_larger_than = larger_than_size != -1;
4249 else if (!strcmp (arg, "unused"))
4253 else if (!strcmp (arg, "no-unused"))
4257 else if (!strcmp (arg, "extra"))
4259 /* We save the value of warn_uninitialized, since if they put
4260 -Wuninitialized on the command line, we need to generate a
4261 warning about not using it without also specifying -O. */
4262 if (warn_uninitialized != 1)
4263 warn_uninitialized = 2;
4271 /* Indexed by enum debug_info_type. */
4272 const char *const debug_type_names[] =
4274 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4277 /* Parse a -g... command line switch. ARG is the value after the -g.
4278 It is safe to access 'ARG - 2' to generate the full switch name.
4279 Return the number of strings consumed. */
4282 decode_g_option (arg)
4285 static unsigned level = 0;
4286 /* A lot of code assumes write_symbols == NO_DEBUG if the
4287 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4288 of what debugging type has been selected). This records the
4289 selected type. It is an error to specify more than one
4291 static enum debug_info_type selected_debug_type = NO_DEBUG;
4292 /* Nonzero if debugging format has been explicitly set.
4293 -g and -ggdb don't explicitly set the debugging format so
4294 -gdwarf -g3 is equivalent to -gdwarf3. */
4295 static int type_explicitly_set_p = 0;
4297 /* The maximum admissible debug level value. */
4298 static const unsigned max_debug_level = 3;
4300 /* Look up ARG in the table. */
4301 for (da = debug_args; da->arg; da++)
4303 const int da_len = strlen (da->arg);
4305 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4307 enum debug_info_type type = da->debug_type;
4308 const char *p = arg + da_len;
4310 if (*p && ! ISDIGIT (*p))
4313 /* A debug flag without a level defaults to level 2.
4314 Note we do not want to call read_integral_parameter
4315 for that case since it will call atoi which
4318 ??? We may want to generalize the interface to
4319 read_integral_parameter to better handle this case
4320 if this case shows up often. */
4322 level = read_integral_parameter (p, 0, max_debug_level + 1);
4324 level = (level == 0) ? 2 : level;
4326 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4328 error ("use -gdwarf -g%d for DWARF v1, level %d",
4331 error ("use -gdwarf-2 for DWARF v2");
4334 if (level > max_debug_level)
4337 ignoring option `%s' due to invalid debug level specification",
4339 level = debug_info_level;
4342 if (type == NO_DEBUG)
4344 type = PREFERRED_DEBUGGING_TYPE;
4346 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4348 #ifdef DWARF2_DEBUGGING_INFO
4349 type = DWARF2_DEBUG;
4351 #ifdef DBX_DEBUGGING_INFO
4358 if (type == NO_DEBUG)
4359 warning ("`%s': unknown or unsupported -g option", arg - 2);
4361 /* Does it conflict with an already selected type? */
4362 if (type_explicitly_set_p
4363 /* -g/-ggdb don't conflict with anything. */
4364 && da->debug_type != NO_DEBUG
4365 && type != selected_debug_type)
4366 warning ("`%s' ignored, conflicts with `-g%s'",
4367 arg - 2, debug_type_names[(int) selected_debug_type]);
4370 /* If the format has already been set, -g/-ggdb
4371 only change the debug level. */
4372 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4373 /* Don't change debugging type. */
4377 selected_debug_type = type;
4378 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4381 write_symbols = (level == 0
4383 : selected_debug_type);
4384 use_gnu_debug_info_extensions = da->use_extensions_p;
4385 debug_info_level = (enum debug_info_level) level;
4398 /* Decode the first argument in the argv as a language-independent option.
4399 Return the number of strings consumed. */
4402 independent_decode_option (argc, argv)
4406 char *arg = argv[0];
4408 if (arg[0] != '-' || arg[1] == 0)
4420 if (!strcmp (arg, "-help"))
4423 exit_after_options = 1;
4427 if (!strcmp (arg, "-target-help"))
4429 display_target_options ();
4430 exit_after_options = 1;
4434 if (!strcmp (arg, "-version"))
4436 print_version (stderr, "");
4437 exit_after_options = 1;
4441 /* Handle '--param <name>=<value>'. */
4442 if (strcmp (arg, "-param") == 0)
4448 error ("-param option missing argument");
4452 /* Get the '<name>=<value>' parameter. */
4454 /* Look for the `='. */
4455 equal = strchr (arg, '=');
4457 error ("invalid --param option: %s", arg);
4462 /* Zero out the `=' sign so that we get two separate strings. */
4464 /* Figure out what value is specified. */
4465 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4466 if (val != INVALID_PARAM_VAL)
4467 set_param_value (arg, val);
4469 error ("invalid parameter value `%s'", equal + 1);
4481 /* Already been treated in main (). Do nothing. */
4485 set_target_switch (arg + 1);
4489 return decode_f_option (arg + 1);
4492 return decode_g_option (arg + 1);
4495 if (!strcmp (arg, "dumpbase"))
4501 dump_base_name = argv[1];
4506 decode_d_option (arg + 1);
4510 if (!strcmp (arg, "pedantic"))
4512 else if (!strcmp (arg, "pedantic-errors"))
4513 flag_pedantic_errors = pedantic = 1;
4514 else if (arg[1] == 0)
4521 if (!strcmp (arg, "quiet"))
4528 if (!strcmp (arg, "version"))
4536 inhibit_warnings = 1;
4545 /* We save the value of warn_uninitialized, since if they put
4546 -Wuninitialized on the command line, we need to generate a
4547 warning about not using it without also specifying -O. */
4548 if (warn_uninitialized != 1)
4549 warn_uninitialized = 2;
4552 return decode_W_option (arg + 1);
4556 if (!strncmp (arg, "aux-info", 8))
4563 aux_info_file_name = argv[1];
4564 flag_gen_aux_info = 1;
4567 else if (arg[8] == '=')
4569 aux_info_file_name = arg + 9;
4570 flag_gen_aux_info = 1;
4575 else if (!strcmp (arg, "auxbase"))
4581 aux_base_name = argv[1];
4585 else if (!strcmp (arg, "auxbase-strip"))
4592 strip_off_ending (argv[1], strlen (argv[1]));
4594 aux_base_name = argv[1];
4609 asm_file_name = argv[1];
4624 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4629 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4633 if (g_switch_val == -1)
4637 g_switch_set = TRUE;
4638 g_switch_value = g_switch_val;
4648 /* Decode -m switches. */
4649 /* Decode the switch -mNAME. */
4652 set_target_switch (name)
4656 int valid_target_option = 0;
4658 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4659 if (!strcmp (target_switches[j].name, name))
4661 if (target_switches[j].value < 0)
4662 target_flags &= ~-target_switches[j].value;
4664 target_flags |= target_switches[j].value;
4667 if (target_switches[j].value < 0)
4668 target_flags_explicit |= -target_switches[j].value;
4670 target_flags_explicit |= target_switches[j].value;
4672 valid_target_option = 1;
4675 #ifdef TARGET_OPTIONS
4676 if (!valid_target_option)
4677 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4679 int len = strlen (target_options[j].prefix);
4680 if (target_options[j].value)
4682 if (!strcmp (target_options[j].prefix, name))
4684 *target_options[j].variable = target_options[j].value;
4685 valid_target_option = 1;
4690 if (!strncmp (target_options[j].prefix, name, len))
4692 *target_options[j].variable = name + len;
4693 valid_target_option = 1;
4699 if (!valid_target_option)
4700 error ("invalid option `%s'", name);
4703 /* Print version information to FILE.
4704 Each line begins with INDENT (for the case where FILE is the
4705 assembler output file). */
4708 print_version (file, indent)
4713 #define __VERSION__ "[?]"
4717 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4719 "%s%s%s version %s (%s) compiled by CC.\n"
4721 , indent, *indent != 0 ? " " : "",
4722 lang_hooks.name, version_string, TARGET_NAME,
4723 indent, __VERSION__);
4724 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4725 indent, *indent != 0 ? " " : "",
4726 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4729 /* Print an option value and return the adjusted position in the line.
4730 ??? We don't handle error returns from fprintf (disk full); presumably
4731 other code will catch a disk full though. */
4734 print_single_switch (file, pos, max, indent, sep, term, type, name)
4737 const char *indent, *sep, *term, *type, *name;
4739 /* The ultrix fprintf returns 0 on success, so compute the result we want
4740 here since we need it for the following test. */
4741 int len = strlen (sep) + strlen (type) + strlen (name);
4746 fprintf (file, "%s", term);
4751 fprintf (file, "%s", indent);
4752 pos = strlen (indent);
4754 fprintf (file, "%s%s%s", sep, type, name);
4759 /* Print active target switches to FILE.
4760 POS is the current cursor position and MAX is the size of a "line".
4761 Each line begins with INDENT and ends with TERM.
4762 Each switch is separated from the next by SEP. */
4765 print_switch_values (file, pos, max, indent, sep, term)
4768 const char *indent, *sep, *term;
4773 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4774 that it can be printed below. This helps reproducibility. Of
4775 course, the string may never be used, but we can't tell that at
4776 this point in the compile. */
4777 default_flag_random_seed ();
4779 /* Print the options as passed. */
4781 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4782 _("options passed: "), "");
4784 for (p = &save_argv[1]; *p != NULL; p++)
4788 if (strcmp (*p, "-o") == 0)
4794 if (strcmp (*p, "-quiet") == 0)
4796 if (strcmp (*p, "-version") == 0)
4801 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4804 fprintf (file, "%s", term);
4806 /* Print the -f and -m options that have been enabled.
4807 We don't handle language specific options but printing argv
4810 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4811 _("options enabled: "), "");
4813 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4814 if (*f_options[j].variable == f_options[j].on_value)
4815 pos = print_single_switch (file, pos, max, indent, sep, term,
4816 "-f", f_options[j].string);
4818 /* Print target specific options. */
4820 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4821 if (target_switches[j].name[0] != '\0'
4822 && target_switches[j].value > 0
4823 && ((target_switches[j].value & target_flags)
4824 == target_switches[j].value))
4826 pos = print_single_switch (file, pos, max, indent, sep, term,
4827 "-m", target_switches[j].name);
4830 #ifdef TARGET_OPTIONS
4831 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4832 if (*target_options[j].variable != NULL)
4835 sprintf (prefix, "-m%s", target_options[j].prefix);
4836 pos = print_single_switch (file, pos, max, indent, sep, term,
4837 prefix, *target_options[j].variable);
4841 fprintf (file, "%s", term);
4844 /* Open assembly code output file. Do this even if -fsyntax-only is
4845 on, because then the driver will have provided the name of a
4846 temporary file or bit bucket for us. NAME is the file specified on
4847 the command line, possibly NULL. */
4849 init_asm_output (name)
4852 if (name == NULL && asm_file_name == 0)
4853 asm_out_file = stdout;
4856 if (asm_file_name == 0)
4858 int len = strlen (dump_base_name);
4859 char *dumpname = (char *) xmalloc (len + 6);
4860 memcpy (dumpname, dump_base_name, len + 1);
4861 strip_off_ending (dumpname, len);
4862 strcat (dumpname, ".s");
4863 asm_file_name = dumpname;
4865 if (!strcmp (asm_file_name, "-"))
4866 asm_out_file = stdout;
4868 asm_out_file = fopen (asm_file_name, "w+");
4869 if (asm_out_file == 0)
4870 fatal_io_error ("can't open %s for writing", asm_file_name);
4873 #ifdef IO_BUFFER_SIZE
4874 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4875 _IOFBF, IO_BUFFER_SIZE);
4878 if (!flag_syntax_only)
4880 #ifdef ASM_FILE_START
4881 ASM_FILE_START (asm_out_file);
4884 #ifdef ASM_COMMENT_START
4885 if (flag_verbose_asm)
4887 /* Print the list of options in effect. */
4888 print_version (asm_out_file, ASM_COMMENT_START);
4889 print_switch_values (asm_out_file, 0, MAX_LINE,
4890 ASM_COMMENT_START, " ", "\n");
4891 /* Add a blank line here so it appears in assembler output but not
4893 fprintf (asm_out_file, "\n");
4899 /* Initialization of the front end environment, before command line
4900 options are parsed. Signal handlers, internationalization etc.
4901 ARGV0 is main's argv[0]. */
4903 general_init (argv0)
4908 p = argv0 + strlen (argv0);
4909 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4913 xmalloc_set_program_name (progname);
4917 gcc_init_libintl ();
4919 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4921 signal (SIGSEGV, crash_signal);
4924 signal (SIGILL, crash_signal);
4927 signal (SIGBUS, crash_signal);
4930 signal (SIGABRT, crash_signal);
4932 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4933 signal (SIGIOT, crash_signal);
4936 signal (SIGFPE, crash_signal);
4939 /* Other host-specific signal setup. */
4940 (*host_hooks.extra_signals)();
4942 /* Initialize the diagnostics reporting machinery, so option parsing
4943 can give warnings and errors. */
4944 diagnostic_initialize (global_dc);
4946 /* Initialize the garbage-collector, string pools and tree type hash
4953 /* Parse command line options and set default flag values, called
4954 after language-independent option-independent initialization. Do
4955 minimal options processing. Outputting diagnostics is OK, but GC
4956 and identifier hashtables etc. are not initialized yet.
4958 Return nonzero to suppress compiler back end initialization. */
4960 parse_options_and_default_flags (argc, argv)
4966 /* Save in case md file wants to emit args as a comment. */
4970 /* Initialize register usage now so switches may override. */
4973 /* Register the language-independent parameters. */
4974 add_params (lang_independent_params, LAST_PARAM);
4976 /* This must be done after add_params but before argument processing. */
4977 init_ggc_heuristics();
4979 /* Perform language-specific options initialization. */
4980 (*lang_hooks.init_options) ();
4982 /* Scan to see what optimization level has been specified. That will
4983 determine the default value of many flags. */
4984 for (i = 1; i < argc; i++)
4986 if (!strcmp (argv[i], "-O"))
4991 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4993 /* Handle -Os, -O2, -O3, -O69, ... */
4994 char *p = &argv[i][2];
4996 if ((p[0] == 's') && (p[1] == 0))
5000 /* Optimizing for size forces optimize to be 2. */
5005 const int optimize_val = read_integral_parameter (p, p - 2, -1);
5006 if (optimize_val != -1)
5008 optimize = optimize_val;
5017 flag_merge_constants = 0;
5023 flag_thread_jumps = 1;
5025 flag_delayed_branch = 1;
5027 #ifdef CAN_DEBUG_WITHOUT_FP
5028 flag_omit_frame_pointer = 1;
5030 flag_guess_branch_prob = 1;
5031 flag_cprop_registers = 1;
5032 flag_loop_optimize = 1;
5033 flag_crossjumping = 1;
5034 flag_if_conversion = 1;
5035 flag_if_conversion2 = 1;
5040 flag_optimize_sibling_calls = 1;
5041 flag_cse_follow_jumps = 1;
5042 flag_cse_skip_blocks = 1;
5044 flag_expensive_optimizations = 1;
5045 flag_strength_reduce = 1;
5046 flag_rerun_cse_after_loop = 1;
5047 flag_rerun_loop_opt = 1;
5048 flag_caller_saves = 1;
5051 #ifdef INSN_SCHEDULING
5052 flag_schedule_insns = 1;
5053 flag_schedule_insns_after_reload = 1;
5056 flag_strict_aliasing = 1;
5057 flag_delete_null_pointer_checks = 1;
5058 flag_reorder_blocks = 1;
5059 flag_reorder_functions = 1;
5064 flag_inline_functions = 1;
5065 flag_rename_registers = 1;
5066 flag_unswitch_loops = 1;
5067 flag_unit_at_a_time = 1;
5070 if (optimize < 2 || optimize_size)
5075 align_functions = 1;
5077 /* Don't reorder blocks when optimizing for size because extra
5078 jump insns may be created; also barrier may create extra padding.
5080 More correctly we should have a block reordering mode that tried
5081 to minimize the combined size of all the jumps. This would more
5082 or less automatically remove extra jumps, but would also try to
5083 use more short jumps instead of long jumps. */
5084 flag_reorder_blocks = 0;
5087 /* Initialize whether `char' is signed. */
5088 flag_signed_char = DEFAULT_SIGNED_CHAR;
5089 #ifdef DEFAULT_SHORT_ENUMS
5090 /* Initialize how much space enums occupy, by default. */
5091 flag_short_enums = DEFAULT_SHORT_ENUMS;
5094 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5097 set_target_switch ("");
5099 /* Unwind tables are always present in an ABI-conformant IA-64
5100 object file, so the default should be ON. */
5101 #ifdef IA64_UNWIND_INFO
5102 flag_unwind_tables = IA64_UNWIND_INFO;
5105 #ifdef OPTIMIZATION_OPTIONS
5106 /* Allow default optimizations to be specified on a per-machine basis. */
5107 OPTIMIZATION_OPTIONS (optimize, optimize_size);
5110 /* Perform normal command line switch decoding. */
5111 for (i = 1; i < argc;)
5114 int indep_processed;
5116 /* Give the language a chance to decode the option for itself. */
5117 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
5119 if (lang_processed >= 0)
5120 /* Now see if the option also has a language independent meaning.
5121 Some options are both language specific and language independent,
5123 indep_processed = independent_decode_option (argc - i, argv + i);
5126 lang_processed = -lang_processed;
5127 indep_processed = 0;
5130 if (lang_processed || indep_processed)
5131 i += MAX (lang_processed, indep_processed);
5134 const char *option = NULL;
5135 const char *lang = NULL;
5138 /* It is possible that the command line switch is not valid for the
5139 current language, but it is valid for another language. In order
5140 to be compatible with previous versions of the compiler (which
5141 did not issue an error message in this case) we check for this
5142 possibility here. If we do find a match, then if extra_warnings
5143 is set we generate a warning message, otherwise we will just
5144 ignore the option. */
5145 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5147 option = documented_lang_options[j].option;
5150 lang = documented_lang_options[j].description;
5151 else if (! strncmp (argv[i], option, strlen (option)))
5155 if (j != ARRAY_SIZE (documented_lang_options))
5159 warning ("ignoring command line option '%s'", argv[i]);
5162 ("(it is valid for %s but not the selected language)",
5166 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5167 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5169 error ("unrecognized option `%s'", argv[i]);
5175 if (flag_no_inline == 2)
5178 flag_really_no_inline = flag_no_inline;
5180 /* Set flag_no_inline before the post_options () hook. The C front
5181 ends use it to determine tree inlining defaults. FIXME: such
5182 code should be lang-independent when all front ends use tree
5183 inlining, in which case it, and this condition, should be moved
5184 to the top of process_options() instead. */
5187 /* Inlining does not work if not optimizing,
5188 so force it not to be done. */
5192 /* The c_decode_option function and decode_option hook set
5193 this to `2' if -Wall is used, so we can avoid giving out
5194 lots of errors for people who don't realize what -Wall does. */
5195 if (warn_uninitialized == 1)
5196 warning ("-Wuninitialized is not supported without -O");
5199 if (flag_really_no_inline == 2)
5200 flag_really_no_inline = flag_no_inline;
5203 /* Process the options that have been parsed. */
5207 /* Allow the front end to perform consistency checks and do further
5208 initialization based on the command line options. This hook also
5209 sets the original filename if appropriate (e.g. foo.i -> foo.c)
5210 so we can correctly initialize debug output. */
5211 no_backend = (*lang_hooks.post_options) (&filename);
5212 main_input_filename = input_filename = filename;
5214 #ifdef OVERRIDE_OPTIONS
5215 /* Some machines may reject certain combinations of options. */
5219 /* Set aux_base_name if not already set. */
5224 char *name = xstrdup (lbasename (filename));
5226 strip_off_ending (name, strlen (name));
5227 aux_base_name = name;
5230 aux_base_name = "gccaux";
5232 /* Set up the align_*_log variables, defaulting them to 1 if they
5233 were still unset. */
5234 if (align_loops <= 0) align_loops = 1;
5235 if (align_loops_max_skip > align_loops || !align_loops)
5236 align_loops_max_skip = align_loops - 1;
5237 align_loops_log = floor_log2 (align_loops * 2 - 1);
5238 if (align_jumps <= 0) align_jumps = 1;
5239 if (align_jumps_max_skip > align_jumps || !align_jumps)
5240 align_jumps_max_skip = align_jumps - 1;
5241 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5242 if (align_labels <= 0) align_labels = 1;
5243 align_labels_log = floor_log2 (align_labels * 2 - 1);
5244 if (align_labels_max_skip > align_labels || !align_labels)
5245 align_labels_max_skip = align_labels - 1;
5246 if (align_functions <= 0) align_functions = 1;
5247 align_functions_log = floor_log2 (align_functions * 2 - 1);
5249 /* Unrolling all loops implies that standard loop unrolling must also
5251 if (flag_unroll_all_loops)
5252 flag_unroll_loops = 1;
5254 if (flag_unroll_loops)
5256 flag_old_unroll_loops = 0;
5257 flag_old_unroll_all_loops = 0;
5260 if (flag_old_unroll_all_loops)
5261 flag_old_unroll_loops = 1;
5263 /* Old loop unrolling requires that strength_reduction be on also. Silently
5264 turn on strength reduction here if it isn't already on. Also, the loop
5265 unrolling code assumes that cse will be run after loop, so that must
5266 be turned on also. */
5267 if (flag_old_unroll_loops)
5269 flag_strength_reduce = 1;
5270 flag_rerun_cse_after_loop = 1;
5272 if (flag_unroll_loops || flag_peel_loops)
5273 flag_rerun_cse_after_loop = 1;
5275 if (flag_non_call_exceptions)
5276 flag_asynchronous_unwind_tables = 1;
5277 if (flag_asynchronous_unwind_tables)
5278 flag_unwind_tables = 1;
5280 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5282 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
5283 flag_unit_at_a_time = 0;
5285 /* Warn about options that are not supported on this machine. */
5286 #ifndef INSN_SCHEDULING
5287 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5288 warning ("instruction scheduling not supported on this target machine");
5291 if (flag_delayed_branch)
5292 warning ("this target machine does not have delayed branches");
5295 user_label_prefix = USER_LABEL_PREFIX;
5296 if (flag_leading_underscore != -1)
5298 /* If the default prefix is more complicated than "" or "_",
5299 issue a warning and ignore this option. */
5300 if (user_label_prefix[0] == 0 ||
5301 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5303 user_label_prefix = flag_leading_underscore ? "_" : "";
5306 warning ("-f%sleading-underscore not supported on this target machine",
5307 flag_leading_underscore ? "" : "no-");
5310 /* If we are in verbose mode, write out the version and maybe all the
5311 option flags in use. */
5314 print_version (stderr, "");
5316 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5319 if (flag_syntax_only)
5321 write_symbols = NO_DEBUG;
5325 /* Now we know write_symbols, set up the debug hooks based on it.
5326 By default we do nothing for debug output. */
5327 #if defined(DBX_DEBUGGING_INFO)
5328 if (write_symbols == DBX_DEBUG)
5329 debug_hooks = &dbx_debug_hooks;
5331 #if defined(XCOFF_DEBUGGING_INFO)
5332 if (write_symbols == XCOFF_DEBUG)
5333 debug_hooks = &xcoff_debug_hooks;
5335 #ifdef SDB_DEBUGGING_INFO
5336 if (write_symbols == SDB_DEBUG)
5337 debug_hooks = &sdb_debug_hooks;
5339 #ifdef DWARF_DEBUGGING_INFO
5340 if (write_symbols == DWARF_DEBUG)
5341 debug_hooks = &dwarf_debug_hooks;
5343 #ifdef DWARF2_DEBUGGING_INFO
5344 if (write_symbols == DWARF2_DEBUG)
5345 debug_hooks = &dwarf2_debug_hooks;
5347 #ifdef VMS_DEBUGGING_INFO
5348 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5349 debug_hooks = &vmsdbg_debug_hooks;
5352 /* If auxiliary info generation is desired, open the output file.
5353 This goes in the same directory as the source file--unlike
5354 all the other output files. */
5355 if (flag_gen_aux_info)
5357 aux_info_file = fopen (aux_info_file_name, "w");
5358 if (aux_info_file == 0)
5359 fatal_io_error ("can't open %s", aux_info_file_name);
5362 if (! targetm.have_named_sections)
5364 if (flag_function_sections)
5366 warning ("-ffunction-sections not supported for this target");
5367 flag_function_sections = 0;
5369 if (flag_data_sections)
5371 warning ("-fdata-sections not supported for this target");
5372 flag_data_sections = 0;
5376 if (flag_function_sections && profile_flag)
5378 warning ("-ffunction-sections disabled; it makes profiling impossible");
5379 flag_function_sections = 0;
5382 #ifndef HAVE_prefetch
5383 if (flag_prefetch_loop_arrays)
5385 warning ("-fprefetch-loop-arrays not supported for this target");
5386 flag_prefetch_loop_arrays = 0;
5389 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5391 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5392 flag_prefetch_loop_arrays = 0;
5396 /* This combination of options isn't handled for i386 targets and doesn't
5397 make much sense anyway, so don't allow it. */
5398 if (flag_prefetch_loop_arrays && optimize_size)
5400 warning ("-fprefetch-loop-arrays is not supported with -Os");
5401 flag_prefetch_loop_arrays = 0;
5404 #ifndef OBJECT_FORMAT_ELF
5405 if (flag_function_sections && write_symbols != NO_DEBUG)
5406 warning ("-ffunction-sections may affect debugging on some targets");
5409 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5410 if (flag_signaling_nans)
5411 flag_trapping_math = 1;
5414 /* Initialize the compiler back end. */
5418 /* init_emit_once uses reg_raw_mode and therefore must be called
5419 after init_regs which initialized reg_raw_mode. */
5421 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5422 || debug_info_level == DINFO_LEVEL_VERBOSE
5423 #ifdef VMS_DEBUGGING_INFO
5424 /* Enable line number info for traceback */
5425 || debug_info_level > DINFO_LEVEL_NONE
5427 || flag_test_coverage
5428 || warn_notreached);
5429 init_fake_stack_mems ();
5433 init_function_once ();
5434 init_varasm_once ();
5436 /* The following initialization functions need to generate rtl, so
5437 provide a dummy function context for them. */
5438 init_dummy_function_start ();
5440 if (flag_caller_saves)
5441 init_caller_save ();
5442 expand_dummy_function_end ();
5445 /* Language-dependent initialization. Returns nonzero on success. */
5447 lang_dependent_init (name)
5450 if (dump_base_name == 0)
5451 dump_base_name = name ? name : "gccdump";
5453 /* Other front-end initialization. */
5454 if ((*lang_hooks.init) () == 0)
5457 init_asm_output (name);
5459 /* These create various _DECL nodes, so need to be called after the
5460 front end is initialized. */
5464 /* The following initialization functions need to generate rtl, so
5465 provide a dummy function context for them. */
5466 init_dummy_function_start ();
5468 expand_dummy_function_end ();
5470 /* Put an entry on the input file stack for the main input file. */
5471 push_srcloc (input_filename, 0);
5473 /* If dbx symbol table desired, initialize writing it and output the
5474 predefined types. */
5475 timevar_push (TV_SYMOUT);
5477 #ifdef DWARF2_UNWIND_INFO
5478 if (dwarf2out_do_frame ())
5479 dwarf2out_frame_init ();
5482 /* Now we have the correct original filename, we can initialize
5484 (*debug_hooks->init) (name);
5486 timevar_pop (TV_SYMOUT);
5491 /* Clean up: close opened files, etc. */
5496 /* Close the dump files. */
5497 if (flag_gen_aux_info)
5499 fclose (aux_info_file);
5501 unlink (aux_info_file_name);
5504 /* Close non-debugging input and output files. Take special care to note
5505 whether fclose returns an error, since the pages might still be on the
5506 buffer chain while the file is open. */
5510 if (ferror (asm_out_file) != 0)
5511 fatal_io_error ("error writing to %s", asm_file_name);
5512 if (fclose (asm_out_file) != 0)
5513 fatal_io_error ("error closing %s", asm_file_name);
5516 /* Do whatever is necessary to finish printing the graphs. */
5517 if (graph_dump_format != no_graph)
5521 for (i = 0; i < (int) DFI_MAX; ++i)
5522 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5527 sprintf (seq, DUMPFILE_FORMAT, i);
5528 suffix = concat (seq, dump_file[i].extension, NULL);
5529 finish_graph_dump_file (dump_base_name, suffix);
5536 ggc_print_statistics ();
5537 stringpool_statistics ();
5538 dump_tree_statistics ();
5541 /* Free up memory for the benefit of leak detectors. */
5544 /* Language-specific end of compilation actions. */
5545 (*lang_hooks.finish) ();
5548 /* Initialize the compiler, and compile the input file. */
5552 /* Initialize timing first. The C front ends read the main file in
5553 the post_options hook, and C++ does file timings. */
5554 if (time_report || !quiet_flag || flag_detailed_statistics)
5556 timevar_start (TV_TOTAL);
5560 /* Don't do any more if an error has already occurred. */
5563 /* Set up the back-end if requested. */
5567 /* Language-dependent initialization. Returns true on success. */
5568 if (lang_dependent_init (filename))
5574 /* Stop timing and print the times. */
5575 timevar_stop (TV_TOTAL);
5576 timevar_print (stderr);
5579 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5580 Decode command args, then call compile_file.
5581 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5582 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5584 It is not safe to call this function more than once. */
5587 toplev_main (argc, argv)
5591 /* Initialization of GCC's environment, and diagnostics. */
5592 general_init (argv[0]);
5594 /* Parse the options and do minimal processing; basically just
5595 enough to default flags appropriately. */
5596 parse_options_and_default_flags (argc, argv);
5598 /* Exit early if we can (e.g. -help). */
5599 if (!exit_after_options)
5602 if (errorcount || sorrycount)
5603 return (FATAL_EXIT_CODE);
5605 return (SUCCESS_EXIT_CODE);