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 **));
127 static void set_Wextra PARAMS ((int));
129 static void print_version PARAMS ((FILE *, const char *));
130 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
131 const char *, const char *,
132 const char *, const char *));
133 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
134 const char *, const char *));
136 /* Nonzero to dump debug info whilst parsing (-dy option). */
137 static int set_yydebug;
139 /* True if we don't need a backend (e.g. preprocessing only). */
140 static bool no_backend;
142 /* Length of line when printing switch values. */
145 /* Name of program invoked, sans directories. */
147 const char *progname;
149 /* Copy of arguments to toplev_main. */
153 /* Name of top-level original source file (what was input to cpp).
154 This comes from the #-command at the beginning of the actual input.
155 If there isn't any there, then this is the cc1 input file name. */
157 const char *main_input_filename;
159 /* Current position in real source file. */
161 location_t input_location;
163 /* Nonzero if it is unsafe to create any new pseudo registers. */
166 /* Stack of currently pending input files. */
168 struct file_stack *input_file_stack;
170 /* Incremented on each change to input_file_stack. */
171 int input_file_stack_tick;
173 /* Name to use as base of names for dump output files. */
175 const char *dump_base_name;
177 /* Name to use as a base for auxiliary output files. */
179 static const char *aux_base_name;
181 /* Format to use to print dumpfile index value */
182 #ifndef DUMPFILE_FORMAT
183 #define DUMPFILE_FORMAT ".%02d."
186 /* Bit flags that specify the machine subtype we are compiling for.
187 Bits are tested using macros TARGET_... defined in the tm.h file
188 and set by `-m...' switches. Must be defined in rtlanal.c. */
190 extern int target_flags;
192 /* A mask of target_flags that includes bit X if X was set or cleared
193 on the command line. */
195 int target_flags_explicit;
197 /* Debug hooks - dependent upon command line options. */
199 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
201 /* Describes a dump file. */
203 struct dump_file_info
205 /* The unique extension to apply, e.g. ".jump". */
206 const char *const extension;
208 /* The -d<c> character that enables this dump file. */
209 char const debug_switch;
211 /* True if there is a corresponding graph dump file. */
212 char const graph_dump_p;
214 /* True if the user selected this dump. */
217 /* True if the files have been initialized (ie truncated). */
221 /* Enumerate the extant dump files. */
265 /* Describes all the dump files. Should be kept in order of the
266 pass and in sync with dump_file_index above.
268 Remaining -d letters:
274 static struct dump_file_info dump_file[DFI_MAX] =
276 { "rtl", 'r', 0, 0, 0 },
277 { "sibling", 'i', 0, 0, 0 },
278 { "eh", 'h', 0, 0, 0 },
279 { "jump", 'j', 0, 0, 0 },
280 { "ssa", 'e', 1, 0, 0 },
281 { "ssaccp", 'W', 1, 0, 0 },
282 { "ssadce", 'X', 1, 0, 0 },
283 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
284 { "null", 'u', 0, 0, 0 },
285 { "cse", 's', 0, 0, 0 },
286 { "addressof", 'F', 0, 0, 0 },
287 { "gcse", 'G', 1, 0, 0 },
288 { "loop", 'L', 1, 0, 0 },
289 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
290 { "cfg", 'f', 1, 0, 0 },
291 { "bp", 'b', 1, 0, 0 },
292 { "ce1", 'C', 1, 0, 0 },
293 { "tracer", 'T', 1, 0, 0 },
294 { "loop2", 'L', 1, 0, 0 },
295 { "cse2", 't', 1, 0, 0 },
296 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
297 { "combine", 'c', 1, 0, 0 },
298 { "ce2", 'C', 1, 0, 0 },
299 { "regmove", 'N', 1, 0, 0 },
300 { "sched", 'S', 1, 0, 0 },
301 { "lreg", 'l', 1, 0, 0 },
302 { "greg", 'g', 1, 0, 0 },
303 { "postreload", 'o', 1, 0, 0 },
304 { "flow2", 'w', 1, 0, 0 },
305 { "peephole2", 'z', 1, 0, 0 },
306 { "rnreg", 'n', 1, 0, 0 },
307 { "ce3", 'E', 1, 0, 0 },
308 { "bbro", 'B', 1, 0, 0 },
309 { "sched2", 'R', 1, 0, 0 },
310 { "stack", 'k', 1, 0, 0 },
311 { "mach", 'M', 1, 0, 0 },
312 { "dbr", 'd', 0, 0, 0 },
315 static int open_dump_file PARAMS ((enum dump_file_index, tree));
316 static void close_dump_file PARAMS ((enum dump_file_index,
317 void (*) (FILE *, rtx), rtx));
319 /* Other flags saying which kinds of debugging dump have been requested. */
321 int rtl_dump_and_exit;
322 int flag_print_asm_name;
323 static int version_flag;
324 static const char *filename;
325 enum graph_dump_types graph_dump_format;
327 /* Name for output file of assembly code, specified with -o. */
331 /* Value of the -G xx switch, and whether it was passed or not. */
335 /* Type(s) of debugging information we are producing (if any).
336 See flags.h for the definitions of the different possible
337 types of debugging information. */
338 enum debug_info_type write_symbols = NO_DEBUG;
340 /* Level of debugging information we are producing. See flags.h
341 for the definitions of the different possible levels. */
342 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
344 /* Nonzero means use GNU-only extensions in the generated symbolic
345 debugging information. */
346 /* Currently, this only has an effect when write_symbols is set to
347 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
348 int use_gnu_debug_info_extensions = 0;
350 /* Nonzero means do optimizations. -O.
351 Particular numeric values stand for particular amounts of optimization;
352 thus, -O2 stores 2 here. However, the optimizations beyond the basic
353 ones are not controlled directly by this variable. Instead, they are
354 controlled by individual `flag_...' variables that are defaulted
355 based on this variable. */
359 /* Nonzero means optimize for size. -Os.
360 The only valid values are zero and nonzero. When optimize_size is
361 nonzero, optimize defaults to 2, but certain individual code
362 bloating optimizations are disabled. */
364 int optimize_size = 0;
366 /* Nonzero if we should exit after parsing options. */
367 static int exit_after_options = 0;
369 /* The FUNCTION_DECL for the function currently being compiled,
370 or 0 if between functions. */
371 tree current_function_decl;
373 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
375 tree current_function_func_begin_label;
377 /* Nonzero if doing dwarf2 duplicate elimination. */
379 int flag_eliminate_dwarf2_dups = 0;
381 /* Nonzero if doing unused type elimination. */
383 int flag_eliminate_unused_debug_types = 1;
385 /* Nonzero if generating code to do profiling. */
387 int profile_flag = 0;
389 /* Nonzero if generating code to profile program flow graph arcs. */
391 int profile_arc_flag = 0;
393 /* Nonzero if generating info for gcov to calculate line test coverage. */
395 int flag_test_coverage = 0;
397 /* Nonzero indicates that branch taken probabilities should be calculated. */
399 int flag_branch_probabilities = 0;
401 /* Nonzero if basic blocks should be reordered. */
403 int flag_reorder_blocks = 0;
405 /* Nonzero if functions should be reordered. */
407 int flag_reorder_functions = 0;
409 /* Nonzero if registers should be renamed. */
411 int flag_rename_registers = 0;
412 int flag_cprop_registers = 0;
414 /* Nonzero for -pedantic switch: warn about anything
415 that standard spec forbids. */
419 /* Temporarily suppress certain warnings.
420 This is set while reading code from a system header file. */
422 int in_system_header = 0;
424 /* Don't print functions as they are compiled. -quiet. */
428 /* Print times taken by the various passes. -ftime-report. */
430 static int time_report = 0;
432 /* Print memory still in use at end of compilation (which may have little
433 to do with peak memory consumption). -fmem-report. */
437 /* Nonzero means to collect statistics which might be expensive
438 and to print them when we are done. */
439 int flag_detailed_statistics = 0;
444 /* Nonzero means `char' should be signed. */
446 int flag_signed_char;
448 /* Nonzero means give an enum type only as many bytes as it needs. */
450 int flag_short_enums;
452 /* Nonzero for -fcaller-saves: allocate values in regs that need to
453 be saved across function calls, if that produces overall better code.
454 Optional now, so people can test it. */
456 #ifdef DEFAULT_CALLER_SAVES
457 int flag_caller_saves = 1;
459 int flag_caller_saves = 0;
462 /* Nonzero if structures and unions should be returned in memory.
464 This should only be defined if compatibility with another compiler or
465 with an ABI is needed, because it results in slower code. */
467 #ifndef DEFAULT_PCC_STRUCT_RETURN
468 #define DEFAULT_PCC_STRUCT_RETURN 1
471 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
473 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
475 /* Nonzero for -fforce-mem: load memory value into a register
476 before arithmetic on it. This makes better cse but slower compilation. */
478 int flag_force_mem = 0;
480 /* Nonzero for -fforce-addr: load memory address into a register before
481 reference to memory. This makes better cse but slower compilation. */
483 int flag_force_addr = 0;
485 /* Nonzero for -fdefer-pop: don't pop args after each function call;
486 instead save them up to pop many calls' args with one insns. */
488 int flag_defer_pop = 0;
490 /* Nonzero for -ffloat-store: don't allocate floats and doubles
491 in extended-precision registers. */
493 int flag_float_store = 0;
495 /* Nonzero for -fcse-follow-jumps:
496 have cse follow jumps to do a more extensive job. */
498 int flag_cse_follow_jumps;
500 /* Nonzero for -fcse-skip-blocks:
501 have cse follow a branch around a block. */
502 int flag_cse_skip_blocks;
504 /* Nonzero for -fexpensive-optimizations:
505 perform miscellaneous relatively-expensive optimizations. */
506 int flag_expensive_optimizations;
508 /* Nonzero for -fthread-jumps:
509 have jump optimize output of loop. */
511 int flag_thread_jumps;
513 /* Nonzero enables strength-reduction in loop.c. */
515 int flag_strength_reduce = 0;
517 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
518 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
519 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
522 int flag_old_unroll_loops;
524 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
525 This is generally not a win. */
527 int flag_old_unroll_all_loops;
529 /* Enables unrolling of simple loops in loop-unroll.c. */
530 int flag_unroll_loops;
532 /* Enables unrolling of all loops in loop-unroll.c. */
533 int flag_unroll_all_loops;
535 /* Nonzero enables loop peeling. */
538 /* Nonzero enables loop unswitching. */
539 int flag_unswitch_loops;
541 /* Nonzero enables prefetch optimizations for arrays in loops. */
543 int flag_prefetch_loop_arrays;
545 /* Nonzero forces all invariant computations in loops to be moved
548 int flag_move_all_movables = 0;
550 /* Nonzero forces all general induction variables in loops to be
553 int flag_reduce_all_givs = 0;
555 /* Nonzero to perform full register move optimization passes. This is the
558 int flag_regmove = 0;
560 /* Nonzero for -fwritable-strings:
561 store string constants in data segment and don't uniquize them. */
563 int flag_writable_strings = 0;
565 /* Nonzero means don't put addresses of constant functions in registers.
566 Used for compiling the Unix kernel, where strange substitutions are
567 done on the assembly output. */
569 int flag_no_function_cse = 0;
571 /* Nonzero for -fomit-frame-pointer:
572 don't make a frame pointer in simple functions that don't require one. */
574 int flag_omit_frame_pointer = 0;
576 /* Nonzero means place each function into its own section on those platforms
577 which support arbitrary section names and unlimited numbers of sections. */
579 int flag_function_sections = 0;
581 /* ... and similar for data. */
583 int flag_data_sections = 0;
585 /* Nonzero to inhibit use of define_optimization peephole opts. */
587 int flag_no_peephole = 0;
589 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
591 int flag_optimize_sibling_calls = 0;
593 /* Nonzero means the front end generally wants `errno' maintained by math
594 operations, like built-in SQRT. */
596 int flag_errno_math = 1;
598 /* Nonzero means that unsafe floating-point math optimizations are allowed
599 for the sake of speed. IEEE compliance is not guaranteed, and operations
600 are allowed to assume that their arguments and results are "normal"
601 (e.g., nonnegative for SQRT). */
603 int flag_unsafe_math_optimizations = 0;
605 /* Nonzero means that no NaNs or +-Infs are expected. */
607 int flag_finite_math_only = 0;
609 /* Zero means that floating-point math operations cannot generate a
610 (user-visible) trap. This is the case, for example, in nonstop
611 IEEE 754 arithmetic. Trapping conditions include division by zero,
612 overflow, underflow, invalid and inexact, but does not include
613 operations on signaling NaNs (see below). */
615 int flag_trapping_math = 1;
617 /* Nonzero means disable transformations observable by signaling NaNs.
618 This option implies that any operation on a IEEE signaling NaN can
619 generate a (user-visible) trap. */
621 int flag_signaling_nans = 0;
623 /* 0 means straightforward implementation of complex divide acceptable.
624 1 means wide ranges of inputs must work for complex divide.
625 2 means C99-like requirements for complex divide (not yet implemented). */
627 int flag_complex_divide_method = 0;
629 /* Nonzero means just do syntax checking; don't output anything. */
631 int flag_syntax_only = 0;
633 /* Nonzero means perform loop optimizer. */
635 static int flag_loop_optimize;
637 /* Nonzero means perform crossjumping. */
639 static int flag_crossjumping;
641 /* Nonzero means perform if conversion. */
643 static int flag_if_conversion;
645 /* Nonzero means perform if conversion after reload. */
647 static int flag_if_conversion2;
649 /* Nonzero means to use global dataflow analysis to eliminate
650 useless null pointer tests. */
652 static int flag_delete_null_pointer_checks;
654 /* Nonzero means perform global CSE. */
658 /* Nonzero means to do the enhanced load motion during gcse, which trys
659 to hoist loads by not killing them when a store to the same location
662 int flag_gcse_lm = 1;
664 /* Nonzero means to perform store motion after gcse, which will try to
665 move stores closer to the exit block. Its not very effective without
668 int flag_gcse_sm = 1;
670 /* Nonzero means to rerun cse after loop optimization. This increases
671 compilation time about 20% and picks up a few more common expressions. */
673 static int flag_rerun_cse_after_loop;
675 /* Nonzero means to run loop optimizations twice. */
677 int flag_rerun_loop_opt;
679 /* Nonzero for -finline-functions: ok to inline functions that look like
680 good inline candidates. */
682 int flag_inline_functions;
684 /* Nonzero for -fkeep-inline-functions: even if we make a function
685 go inline everywhere, keep its definition around for debugging
688 int flag_keep_inline_functions;
690 /* Nonzero means that functions will not be inlined. */
692 int flag_no_inline = 2;
694 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
695 not just because the tree inliner turned us off. */
697 int flag_really_no_inline = 2;
699 /* Nonzero means that we should emit static const variables
700 regardless of whether or not optimization is turned on. */
702 int flag_keep_static_consts = 1;
704 /* Nonzero means we should be saving declaration info into a .X file. */
706 int flag_gen_aux_info = 0;
708 /* Specified name of aux-info file. */
710 static char *aux_info_file_name;
712 /* Nonzero means make the text shared if supported. */
714 int flag_shared_data;
716 /* Nonzero means schedule into delayed branch slots if supported. */
718 int flag_delayed_branch;
720 /* Nonzero if we are compiling pure (sharable) code.
721 Value is 1 if we are doing "small" pic; value is 2 if we're doing
726 /* Set to the default thread-local storage (tls) model to use. */
728 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
730 /* Nonzero means generate extra code for exception handling and enable
731 exception handling. */
735 /* Nonzero means generate frame unwind info table when supported. */
737 int flag_unwind_tables = 0;
739 /* Nonzero means generate frame unwind info table exact at each insn boundary */
741 int flag_asynchronous_unwind_tables = 0;
743 /* Nonzero means allow for forced unwinding. */
745 int flag_forced_unwind_exceptions;
747 /* Nonzero means don't place uninitialized global data in common storage
752 /* Nonzero means change certain warnings into errors.
753 Usually these are warnings about failure to conform to some standard. */
755 int flag_pedantic_errors = 0;
757 /* flag_schedule_insns means schedule insns within basic blocks (before
759 flag_schedule_insns_after_reload means schedule insns after
762 int flag_schedule_insns = 0;
763 int flag_schedule_insns_after_reload = 0;
765 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
766 int flag_sched2_use_superblocks = 0;
768 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
770 int flag_sched2_use_traces = 0;
772 /* The following flags have effect only for scheduling before register
775 flag_schedule_interblock means schedule insns across basic blocks.
776 flag_schedule_speculative means allow speculative motion of non-load insns.
777 flag_schedule_speculative_load means allow speculative motion of some
779 flag_schedule_speculative_load_dangerous allows speculative motion of more
782 int flag_schedule_interblock = 1;
783 int flag_schedule_speculative = 1;
784 int flag_schedule_speculative_load = 0;
785 int flag_schedule_speculative_load_dangerous = 0;
787 int flag_single_precision_constant;
789 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
790 by a cheaper branch on a count register. */
791 int flag_branch_on_count_reg = 1;
793 /* -finhibit-size-directive inhibits output of .size for ELF.
794 This is used only for compiling crtstuff.c,
795 and it may be extended to other effects
796 needed for crtstuff.c on other systems. */
797 int flag_inhibit_size_directive = 0;
799 /* -fverbose-asm causes extra commentary information to be produced in
800 the generated assembly code (to make it more readable). This option
801 is generally only of use to those who actually need to read the
802 generated assembly code (perhaps while debugging the compiler itself).
803 -fno-verbose-asm, the default, causes the extra information
804 to be omitted and is useful when comparing two assembler files. */
806 int flag_verbose_asm = 0;
808 /* -dA causes debug commentary information to be produced in
809 the generated assembly code (to make it more readable). This option
810 is generally only of use to those who actually need to read the
811 generated assembly code (perhaps while debugging the compiler itself).
812 Currently, this switch is only used by dwarfout.c; however, it is intended
813 to be a catchall for printing debug information in the assembler file. */
815 int flag_debug_asm = 0;
817 /* -dP causes the rtl to be emitted as a comment in assembly. */
819 int flag_dump_rtl_in_asm = 0;
821 /* -fgnu-linker specifies use of the GNU linker for initializations.
822 (Or, more generally, a linker that handles initializations.)
823 -fno-gnu-linker says that collect2 will be used. */
825 int flag_gnu_linker = 0;
827 int flag_gnu_linker = 1;
830 /* Nonzero means put zero initialized data in the bss section. */
831 int flag_zero_initialized_in_bss = 1;
836 /* Enable ssa conditional constant propagation. */
837 int flag_ssa_ccp = 0;
839 /* Enable ssa aggressive dead code elimination. */
840 int flag_ssa_dce = 0;
842 /* Tag all structures with __attribute__(packed). */
843 int flag_pack_struct = 0;
845 /* Emit code to check for stack overflow; also may cause large objects
846 to be allocated dynamically. */
847 int flag_stack_check;
849 /* When non-NULL, indicates that whenever space is allocated on the
850 stack, the resulting stack pointer must not pass this
851 address---that is, for stacks that grow downward, the stack pointer
852 must always be greater than or equal to this address; for stacks
853 that grow upward, the stack pointer must be less than this address.
854 At present, the rtx may be either a REG or a SYMBOL_REF, although
855 the support provided depends on the backend. */
858 /* 0 if pointer arguments may alias each other. True in C.
859 1 if pointer arguments may not alias each other but may alias
861 2 if pointer arguments may not alias each other and may not
862 alias global variables. True in Fortran.
863 This defaults to 0 for C. */
864 int flag_argument_noalias = 0;
866 /* Nonzero if we should do (language-dependent) alias analysis.
867 Typically, this analysis will assume that expressions of certain
868 types do not alias expressions of certain other types. Only used
869 if alias analysis (in general) is enabled. */
870 int flag_strict_aliasing = 0;
872 /* Instrument functions with calls at entry and exit, for profiling. */
873 int flag_instrument_function_entry_exit = 0;
875 /* Nonzero means ignore `#ident' directives. 0 means handle them.
876 On SVR4 targets, it also controls whether or not to emit a
877 string identifying the compiler. */
879 int flag_no_ident = 0;
881 /* This will perform a peephole pass before sched2. */
882 int flag_peephole2 = 0;
884 /* This will try to guess branch probabilities. */
885 int flag_guess_branch_prob = 0;
887 /* -fcheck-bounds causes gcc to generate array bounds checks.
888 For C, C++, ObjC: defaults to off.
889 For Java: defaults to on.
890 For Fortran: defaults to off. */
891 int flag_bounds_check = 0;
893 /* This will attempt to merge constant section constants, if 1 only
894 string constants and constants from constant pool, if 2 also constant
896 int flag_merge_constants = 1;
898 /* If one, renumber instruction UIDs to reduce the number of
899 unused UIDs if there are a lot of instructions. If greater than
900 one, unconditionally renumber instruction UIDs. */
901 int flag_renumber_insns = 1;
903 /* If nonzero, use the graph coloring register allocator. */
904 int flag_new_regalloc = 0;
906 /* Nonzero if we perform superblock formation. */
910 /* Nonzero if we perform whole unit at a time compilation. */
912 int flag_unit_at_a_time = 0;
914 /* Values of the -falign-* flags: how much to align labels in code.
915 0 means `use default', 1 means `don't align'.
916 For each variable, there is an _log variant which is the power
917 of two not less than the variable, for .align output. */
921 int align_loops_max_skip;
924 int align_jumps_max_skip;
926 int align_labels_log;
927 int align_labels_max_skip;
929 int align_functions_log;
931 /* Like align_functions_log above, but used by front-ends to force the
932 minimum function alignment. Zero means no alignment is forced. */
933 int force_align_functions_log;
935 /* Table of supported debugging formats. */
938 const char *const arg;
939 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
940 constant expression, we use NO_DEBUG in its place. */
941 const enum debug_info_type debug_type;
942 const int use_extensions_p;
943 const char *const description;
947 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
948 N_("Generate debugging info in default format") },
949 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
950 #ifdef DBX_DEBUGGING_INFO
951 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
952 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
954 #ifdef DWARF_DEBUGGING_INFO
955 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
956 { "dwarf+", DWARF_DEBUG, 1,
957 N_("Generate extended DWARF-1 format debug info") },
959 #ifdef DWARF2_DEBUGGING_INFO
960 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
962 #ifdef XCOFF_DEBUGGING_INFO
963 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
964 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
966 #ifdef SDB_DEBUGGING_INFO
967 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
969 #ifdef VMS_DEBUGGING_INFO
970 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
977 const char *const string;
980 const char *const description;
982 lang_independent_options;
986 /* Add or remove a leading underscore from user symbols. */
987 int flag_leading_underscore = -1;
989 /* The user symbol prefix after having resolved same. */
990 const char *user_label_prefix;
992 static const param_info lang_independent_params[] = {
993 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
994 { OPTION, DEFAULT, HELP },
995 #include "params.def"
1000 /* Table of language-independent -f options.
1001 STRING is the option name. VARIABLE is the address of the variable.
1002 ON_VALUE is the value to store in VARIABLE
1003 if `-fSTRING' is seen as an option.
1004 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1006 static const lang_independent_options f_options[] =
1008 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
1009 N_("Perform DWARF2 duplicate elimination") },
1010 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1,
1011 N_("Perform unused type elimination in debug info") },
1012 {"float-store", &flag_float_store, 1,
1013 N_("Do not store floats in registers") },
1014 {"defer-pop", &flag_defer_pop, 1,
1015 N_("Defer popping functions args from stack until later") },
1016 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1017 N_("When possible do not generate stack frames") },
1018 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1019 N_("Optimize sibling and tail recursive calls") },
1020 {"tracer", &flag_tracer, 1,
1021 N_("Perform superblock formation via tail duplication") },
1022 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1023 N_("Compile whole compilation unit at a time") },
1024 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1025 N_("When running CSE, follow jumps to their targets") },
1026 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1027 N_("When running CSE, follow conditional jumps") },
1028 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1029 N_("Perform a number of minor, expensive optimizations") },
1030 {"thread-jumps", &flag_thread_jumps, 1,
1031 N_("Perform jump threading optimizations") },
1032 {"strength-reduce", &flag_strength_reduce, 1,
1033 N_("Perform strength reduction optimizations") },
1034 {"unroll-loops", &flag_unroll_loops, 1,
1035 N_("Perform loop unrolling when iteration count is known") },
1036 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1037 N_("Perform loop unrolling for all loops") },
1038 {"old-unroll-loops", &flag_old_unroll_loops, 1,
1039 N_("Perform loop unrolling when iteration count is known") },
1040 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1,
1041 N_("Perform loop unrolling for all loops") },
1042 {"peel-loops", &flag_peel_loops, 1,
1043 N_("Perform loop peeling") },
1044 {"unswitch-loops", &flag_unswitch_loops, 1,
1045 N_("Perform loop unswitching") },
1046 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1047 N_("Generate prefetch instructions, if available, for arrays in loops") },
1048 {"move-all-movables", &flag_move_all_movables, 1,
1049 N_("Force all loop invariant computations out of loops") },
1050 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1051 N_("Strength reduce all loop general induction variables") },
1052 {"writable-strings", &flag_writable_strings, 1,
1053 N_("Store strings in writable data section") },
1054 {"peephole", &flag_no_peephole, 0,
1055 N_("Enable machine specific peephole optimizations") },
1056 {"force-mem", &flag_force_mem, 1,
1057 N_("Copy memory operands into registers before using") },
1058 {"force-addr", &flag_force_addr, 1,
1059 N_("Copy memory address constants into regs before using") },
1060 {"function-cse", &flag_no_function_cse, 0,
1061 N_("Allow function addresses to be held in registers") },
1062 {"inline-functions", &flag_inline_functions, 1,
1063 N_("Integrate simple functions into their callers") },
1064 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1065 N_("Generate code for funcs even if they are fully inlined") },
1066 {"inline", &flag_no_inline, 0,
1067 N_("Pay attention to the 'inline' keyword") },
1068 {"keep-static-consts", &flag_keep_static_consts, 1,
1069 N_("Emit static const variables even if they are not used") },
1070 {"syntax-only", &flag_syntax_only, 1,
1071 N_("Check for syntax errors, then stop") },
1072 {"shared-data", &flag_shared_data, 1,
1073 N_("Mark data as shared rather than private") },
1074 {"caller-saves", &flag_caller_saves, 1,
1075 N_("Enable saving registers around function calls") },
1076 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1077 N_("Return 'short' aggregates in memory, not registers") },
1078 {"reg-struct-return", &flag_pcc_struct_return, 0,
1079 N_("Return 'short' aggregates in registers") },
1080 {"delayed-branch", &flag_delayed_branch, 1,
1081 N_("Attempt to fill delay slots of branch instructions") },
1082 {"gcse", &flag_gcse, 1,
1083 N_("Perform the global common subexpression elimination") },
1084 {"gcse-lm", &flag_gcse_lm, 1,
1085 N_("Perform enhanced load motion during global subexpression elimination") },
1086 {"gcse-sm", &flag_gcse_sm, 1,
1087 N_("Perform store motion after global subexpression elimination") },
1088 {"loop-optimize", &flag_loop_optimize, 1,
1089 N_("Perform the loop optimizations") },
1090 {"crossjumping", &flag_crossjumping, 1,
1091 N_("Perform cross-jumping optimization") },
1092 {"if-conversion", &flag_if_conversion, 1,
1093 N_("Perform conversion of conditional jumps to branchless equivalents") },
1094 {"if-conversion2", &flag_if_conversion2, 1,
1095 N_("Perform conversion of conditional jumps to conditional execution") },
1096 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1097 N_("Run CSE pass after loop optimizations") },
1098 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1099 N_("Run the loop optimizer twice") },
1100 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1101 N_("Delete useless null pointer checks") },
1102 {"schedule-insns", &flag_schedule_insns, 1,
1103 N_("Reschedule instructions before register allocation") },
1104 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1105 N_("Reschedule instructions after register allocation") },
1106 {"sched-interblock",&flag_schedule_interblock, 1,
1107 N_("Enable scheduling across basic blocks") },
1108 {"sched-spec",&flag_schedule_speculative, 1,
1109 N_("Allow speculative motion of non-loads") },
1110 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1111 N_("Allow speculative motion of some loads") },
1112 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1113 N_("Allow speculative motion of more loads") },
1114 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1115 N_("If scheduling post reload, do superblock scheduling") },
1116 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1117 N_("If scheduling post reload, do trace scheduling") },
1118 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1119 N_("Replace add,compare,branch with branch on count reg") },
1120 {"pic", &flag_pic, 1,
1121 N_("Generate position independent code, if possible") },
1122 {"PIC", &flag_pic, 2, ""},
1123 {"exceptions", &flag_exceptions, 1,
1124 N_("Enable exception handling") },
1125 {"unwind-tables", &flag_unwind_tables, 1,
1126 N_("Just generate unwind tables for exception handling") },
1127 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1128 N_("Generate unwind tables exact at each instruction boundary") },
1129 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1130 N_("Support synchronous non-call exceptions") },
1131 {"forced-unwind-exceptions", &flag_forced_unwind_exceptions, 1,
1132 N_("Support forced unwinding, e.g. for thread cancellation") },
1133 {"profile-arcs", &profile_arc_flag, 1,
1134 N_("Insert arc based program profiling code") },
1135 {"test-coverage", &flag_test_coverage, 1,
1136 N_("Create data files needed by gcov") },
1137 {"branch-probabilities", &flag_branch_probabilities, 1,
1138 N_("Use profiling information for branch probabilities") },
1139 {"profile", &profile_flag, 1,
1140 N_("Enable basic program profiling code") },
1141 {"reorder-blocks", &flag_reorder_blocks, 1,
1142 N_("Reorder basic blocks to improve code placement") },
1143 {"reorder-functions", &flag_reorder_functions, 1,
1144 N_("Reorder functions to improve code placement") },
1145 {"rename-registers", &flag_rename_registers, 1,
1146 N_("Do the register renaming optimization pass") },
1147 {"cprop-registers", &flag_cprop_registers, 1,
1148 N_("Do the register copy-propagation optimization pass") },
1149 {"common", &flag_no_common, 0,
1150 N_("Do not put uninitialized globals in the common section") },
1151 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1152 N_("Do not generate .size directives") },
1153 {"function-sections", &flag_function_sections, 1,
1154 N_("place each function into its own section") },
1155 {"data-sections", &flag_data_sections, 1,
1156 N_("place data items into their own section") },
1157 {"verbose-asm", &flag_verbose_asm, 1,
1158 N_("Add extra commentary to assembler output") },
1159 {"gnu-linker", &flag_gnu_linker, 1,
1160 N_("Output GNU ld formatted global initializers") },
1161 {"regmove", &flag_regmove, 1,
1162 N_("Enables a register move optimization") },
1163 {"optimize-register-move", &flag_regmove, 1,
1164 N_("Do the full regmove optimization pass") },
1165 {"pack-struct", &flag_pack_struct, 1,
1166 N_("Pack structure members together without holes") },
1167 {"stack-check", &flag_stack_check, 1,
1168 N_("Insert stack checking code into the program") },
1169 {"argument-alias", &flag_argument_noalias, 0,
1170 N_("Specify that arguments may alias each other & globals") },
1171 {"argument-noalias", &flag_argument_noalias, 1,
1172 N_("Assume arguments may alias globals but not each other") },
1173 {"argument-noalias-global", &flag_argument_noalias, 2,
1174 N_("Assume arguments do not alias each other or globals") },
1175 {"strict-aliasing", &flag_strict_aliasing, 1,
1176 N_("Assume strict aliasing rules apply") },
1177 {"align-loops", &align_loops, 0,
1178 N_("Align the start of loops") },
1179 {"align-jumps", &align_jumps, 0,
1180 N_("Align labels which are only reached by jumping") },
1181 {"align-labels", &align_labels, 0,
1182 N_("Align all labels") },
1183 {"align-functions", &align_functions, 0,
1184 N_("Align the start of functions") },
1185 {"merge-constants", &flag_merge_constants, 1,
1186 N_("Attempt to merge identical constants across compilation units") },
1187 {"merge-all-constants", &flag_merge_constants, 2,
1188 N_("Attempt to merge identical constants and constant variables") },
1189 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1190 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1191 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1192 N_("Instrument function entry/exit with profiling calls") },
1193 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1194 N_("Put zero initialized data in the bss section") },
1195 {"ssa", &flag_ssa, 1,
1196 N_("Enable SSA optimizations") },
1197 {"ssa-ccp", &flag_ssa_ccp, 1,
1198 N_("Enable SSA conditional constant propagation") },
1199 {"ssa-dce", &flag_ssa_dce, 1,
1200 N_("Enable aggressive SSA dead code elimination") },
1201 {"leading-underscore", &flag_leading_underscore, 1,
1202 N_("External symbols have a leading underscore") },
1203 {"ident", &flag_no_ident, 0,
1204 N_("Process #ident directives") },
1205 { "peephole2", &flag_peephole2, 1,
1206 N_("Enables an rtl peephole pass run before sched2") },
1207 {"finite-math-only", &flag_finite_math_only, 1,
1208 N_("Assume no NaNs or +-Infs are generated") },
1209 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1210 N_("Enables guessing of branch probabilities") },
1211 {"math-errno", &flag_errno_math, 1,
1212 N_("Set errno after built-in math functions") },
1213 {"trapping-math", &flag_trapping_math, 1,
1214 N_("Floating-point operations can trap") },
1215 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1216 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1217 {"signaling-nans", &flag_signaling_nans, 1,
1218 N_("Disable optimizations observable by IEEE signaling NaNs") },
1219 {"bounds-check", &flag_bounds_check, 1,
1220 N_("Generate code to check bounds before indexing arrays") },
1221 {"single-precision-constant", &flag_single_precision_constant, 1,
1222 N_("Convert floating point constant to single precision constant") },
1223 {"time-report", &time_report, 1,
1224 N_("Report time taken by each compiler pass at end of run") },
1225 {"mem-report", &mem_report, 1,
1226 N_("Report on permanent memory allocation at end of run") },
1227 { "trapv", &flag_trapv, 1,
1228 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1229 { "new-ra", &flag_new_regalloc, 1,
1230 N_("Use graph coloring register allocation.") },
1233 /* Table of language-specific options. */
1235 static const struct lang_opt
1237 const char *const option;
1238 const char *const description;
1240 documented_lang_options[] =
1242 /* In order not to overload the --help output, the convention
1243 used here is to only describe those options which are not
1244 enabled by default. */
1247 N_("Compile just for ISO C90") },
1249 N_("Determine language standard") },
1251 { "-fsigned-bitfields", "" },
1252 { "-funsigned-bitfields",
1253 N_("Make bit-fields by unsigned by default") },
1254 { "-fno-signed-bitfields", "" },
1255 { "-fno-unsigned-bitfields","" },
1257 N_("Make 'char' be signed by default") },
1258 { "-funsigned-char",
1259 N_("Make 'char' be unsigned by default") },
1260 { "-fno-signed-char", "" },
1261 { "-fno-unsigned-char", "" },
1265 N_("Do not recognize the 'asm' keyword") },
1266 { "-fbuiltin", "" },
1268 N_("Do not recognize any built in functions") },
1270 N_("Assume normal C execution environment") },
1271 { "-fno-hosted", "" },
1273 N_("Assume that standard libraries & main might not exist") },
1274 { "-fno-freestanding", "" },
1275 { "-fcond-mismatch",
1276 N_("Allow different types as args of ? operator") },
1277 { "-fno-cond-mismatch", "" },
1278 { "-fdollars-in-identifiers",
1279 N_("Allow the use of $ inside identifiers") },
1280 { "-fno-dollars-in-identifiers", "" },
1281 { "-fpreprocessed", "" },
1282 { "-fno-preprocessed", "" },
1284 N_("Use the same size for double as for float") },
1285 { "-fno-short-double", "" },
1287 N_("Use the smallest fitting integer to hold enums") },
1288 { "-fno-short-enums", "" },
1290 N_("Override the underlying type for wchar_t to `unsigned short'") },
1291 { "-fno-short-wchar", "" },
1294 N_("Enable most warning messages") },
1295 { "-Wbad-function-cast",
1296 N_("Warn about casting functions to incompatible types") },
1297 { "-Wno-bad-function-cast", "" },
1298 { "-Wmissing-format-attribute",
1299 N_("Warn about functions which might be candidates for format attributes") },
1300 { "-Wno-missing-format-attribute", "" },
1302 N_("Warn about casts which discard qualifiers") },
1303 { "-Wno-cast-qual", "" },
1304 { "-Wchar-subscripts",
1305 N_("Warn about subscripts whose type is 'char'") },
1306 { "-Wno-char-subscripts", "" },
1308 N_("Warn if nested comments are detected") },
1309 { "-Wno-comment", "" },
1311 N_("Warn if nested comments are detected") },
1312 { "-Wno-comments", "" },
1314 N_("Warn about possibly confusing type conversions") },
1315 { "-Wno-conversion", "" },
1316 { "-Wdiv-by-zero", "" },
1317 { "-Wno-div-by-zero",
1318 N_("Do not warn about compile-time integer division by zero") },
1320 N_("Warn about testing equality of floating point numbers") },
1321 { "-Wno-float-equal", "" },
1323 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1324 { "-Wno-format", "" },
1325 { "-Wformat-extra-args", "" },
1326 { "-Wno-format-extra-args",
1327 N_("Don't warn about too many arguments to format functions") },
1328 { "-Wformat-nonliteral",
1329 N_("Warn about non-string-literal format strings") },
1330 { "-Wno-format-nonliteral", "" },
1331 { "-Wformat-security",
1332 N_("Warn about possible security problems with format functions") },
1333 { "-Wno-format-security", "" },
1334 { "-Wformat-y2k", "" },
1335 { "-Wno-format-y2k",
1336 N_("Don't warn about strftime formats yielding 2 digit years") },
1337 { "-Wimplicit-function-declaration",
1338 N_("Warn about implicit function declarations") },
1339 { "-Wno-implicit-function-declaration", "" },
1340 { "-Werror-implicit-function-declaration", "" },
1342 N_("Warn when a declaration does not specify a type") },
1343 { "-Wno-implicit-int", "" },
1344 { "-Wimplicit", "" },
1345 { "-Wno-implicit", "" },
1347 N_("Warn about the use of the #import directive") },
1348 { "-Wno-import", "" },
1350 N_("Warn about PCH files that are found but not used") },
1351 { "-Wlong-long","" },
1353 N_("Do not warn about using 'long long' when -pedantic") },
1355 N_("Warn about suspicious declarations of main") },
1356 { "-Wno-main", "" },
1357 { "-Wmissing-braces",
1358 N_("Warn about possibly missing braces around initializers") },
1359 { "-Wno-missing-braces", "" },
1360 { "-Wmissing-declarations",
1361 N_("Warn about global funcs without previous declarations") },
1362 { "-Wno-missing-declarations", "" },
1363 { "-Wmissing-prototypes",
1364 N_("Warn about global funcs without prototypes") },
1365 { "-Wno-missing-prototypes", "" },
1367 N_("Warn about use of multicharacter literals") },
1368 { "-Wno-multichar", "" },
1369 { "-Wnested-externs",
1370 N_("Warn about externs not at file scope level") },
1371 { "-Wno-nested-externs", "" },
1373 N_("Warn about possible missing parentheses") },
1374 { "-Wno-parentheses", "" },
1375 { "-Wpointer-arith",
1376 N_("Warn about function pointer arithmetic") },
1377 { "-Wno-pointer-arith", "" },
1378 { "-Wredundant-decls",
1379 N_("Warn about multiple declarations of the same object") },
1380 { "-Wno-redundant-decls", "" },
1382 N_("Warn whenever a function's return-type defaults to int") },
1383 { "-Wno-return-type", "" },
1384 { "-Wsequence-point",
1385 N_("Warn about possible violations of sequence point rules") },
1386 { "-Wno-sequence-point", "" },
1388 N_("Warn about signed/unsigned comparisons") },
1389 { "-Wno-sign-compare", "" },
1390 { "-Wstrict-prototypes",
1391 N_("Warn about non-prototyped function decls") },
1392 { "-Wno-strict-prototypes", "" },
1394 N_("Warn about constructs whose meanings change in ISO C") },
1395 { "-Wno-traditional", "" },
1397 N_("Warn when trigraphs are encountered") },
1398 { "-Wno-trigraphs", "" },
1400 { "-Wno-undef", "" },
1401 { "-Wunknown-pragmas",
1402 N_("Warn about unrecognized pragmas") },
1403 { "-Wno-unknown-pragmas", "" },
1404 { "-Wwrite-strings",
1405 N_("Mark strings as 'const char *'") },
1406 { "-Wno-write-strings", "" },
1408 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1410 #include "options.h"
1414 /* Here is a table, controlled by the tm.h file, listing each -m switch
1415 and which bits in `target_switches' it should set or clear.
1416 If VALUE is positive, it is bits to set.
1417 If VALUE is negative, -VALUE is bits to clear.
1418 (The sign bit is not used so there is no confusion.) */
1422 const char *const name;
1424 const char *const description;
1426 target_switches[] = TARGET_SWITCHES;
1428 /* This table is similar, but allows the switch to have a value. */
1430 #ifdef TARGET_OPTIONS
1433 const char *const prefix;
1434 const char **const variable;
1435 const char *const description;
1436 const char *const value;
1438 target_options[] = TARGET_OPTIONS;
1441 /* Options controlling warnings. */
1443 /* Don't print warning messages. -w. */
1445 int inhibit_warnings = 0;
1447 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1449 int warn_system_headers = 0;
1451 /* Print various extra warnings. -W/-Wextra. */
1453 int extra_warnings = 0;
1455 /* Treat warnings as errors. -Werror. */
1457 int warnings_are_errors = 0;
1459 /* Nonzero to warn about unused variables, functions et.al. */
1461 int warn_unused_function;
1462 int warn_unused_label;
1463 int warn_unused_parameter;
1464 int warn_unused_variable;
1465 int warn_unused_value;
1467 /* Used for cooperation between set_Wunused and set_Wextra. */
1468 static int maybe_warn_unused_parameter;
1470 /* Nonzero to warn about code which is never reached. */
1472 int warn_notreached;
1474 /* Nonzero to warn about variables used before they are initialized. */
1476 int warn_uninitialized;
1478 /* Nonzero means warn about all declarations which shadow others. */
1482 /* Warn if a switch on an enum, that does not have a default case,
1483 fails to have a case for every enum value. */
1487 /* Warn if a switch does not have a default case. */
1489 int warn_switch_default;
1491 /* Warn if a switch on an enum fails to have a case for every enum
1492 value (regardless of the presence or otherwise of a default case). */
1494 int warn_switch_enum;
1496 /* Nonzero means warn about function definitions that default the return type
1497 or that use a null return and have a return-type other than void. */
1499 int warn_return_type;
1501 /* Nonzero means warn about pointer casts that increase the required
1502 alignment of the target type (and might therefore lead to a crash
1503 due to a misaligned access). */
1505 int warn_cast_align;
1507 /* Nonzero means warn about any objects definitions whose size is larger
1508 than N bytes. Also want about function definitions whose returned
1509 values are larger than N bytes. The value N is in `larger_than_size'. */
1511 int warn_larger_than;
1512 HOST_WIDE_INT larger_than_size;
1514 /* Nonzero means warn if inline function is too large. */
1518 /* Warn if a function returns an aggregate,
1519 since there are often incompatible calling conventions for doing this. */
1521 int warn_aggregate_return;
1523 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1527 /* Warn when gcc pads a structure to an alignment boundary. */
1531 /* Warn when an optimization pass is disabled. */
1533 int warn_disabled_optimization;
1535 /* Warn about functions which might be candidates for attribute noreturn. */
1537 int warn_missing_noreturn;
1539 /* Nonzero means warn about uses of __attribute__((deprecated))
1542 int warn_deprecated_decl = 1;
1544 /* Nonzero means warn about constructs which might not be
1545 strict-aliasing safe. */
1547 int warn_strict_aliasing;
1549 /* Like f_options, but for -W. */
1551 static const lang_independent_options W_options[] =
1553 {"unused-function", &warn_unused_function, 1,
1554 N_("Warn when a function is unused") },
1555 {"unused-label", &warn_unused_label, 1,
1556 N_("Warn when a label is unused") },
1557 {"unused-parameter", &warn_unused_parameter, 1,
1558 N_("Warn when a function parameter is unused") },
1559 {"unused-variable", &warn_unused_variable, 1,
1560 N_("Warn when a variable is unused") },
1561 {"unused-value", &warn_unused_value, 1,
1562 N_("Warn when an expression value is unused") },
1563 {"system-headers", &warn_system_headers, 1,
1564 N_("Do not suppress warnings from system headers") },
1565 {"error", &warnings_are_errors, 1,
1566 N_("Treat all warnings as errors") },
1567 {"shadow", &warn_shadow, 1,
1568 N_("Warn when one local variable shadows another") },
1569 {"switch", &warn_switch, 1,
1570 N_("Warn about enumerated switches, with no default, missing a case") },
1571 {"switch-default", &warn_switch_default, 1,
1572 N_("Warn about enumerated switches missing a default case") },
1573 {"switch-enum", &warn_switch_enum, 1,
1574 N_("Warn about all enumerated switches missing a specific case") },
1575 {"aggregate-return", &warn_aggregate_return, 1,
1576 N_("Warn about returning structures, unions or arrays") },
1577 {"cast-align", &warn_cast_align, 1,
1578 N_("Warn about pointer casts which increase alignment") },
1579 {"unreachable-code", &warn_notreached, 1,
1580 N_("Warn about code that will never be executed") },
1581 {"uninitialized", &warn_uninitialized, 1,
1582 N_("Warn about uninitialized automatic variables") },
1583 {"inline", &warn_inline, 1,
1584 N_("Warn when an inlined function cannot be inlined") },
1585 {"packed", &warn_packed, 1,
1586 N_("Warn when the packed attribute has no effect on struct layout") },
1587 {"padded", &warn_padded, 1,
1588 N_("Warn when padding is required to align struct members") },
1589 {"disabled-optimization", &warn_disabled_optimization, 1,
1590 N_("Warn when an optimization pass is disabled") },
1591 {"deprecated-declarations", &warn_deprecated_decl, 1,
1592 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1593 {"missing-noreturn", &warn_missing_noreturn, 1,
1594 N_("Warn about functions which might be candidates for attribute noreturn") },
1595 {"strict-aliasing", &warn_strict_aliasing, 1,
1596 N_ ("Warn about code which might break the strict aliasing rules") }
1600 set_Wunused (setting)
1603 warn_unused_function = setting;
1604 warn_unused_label = setting;
1605 /* Unused function parameter warnings are reported when either
1606 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1607 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1608 otherwise set maybe_warn_extra_parameter, which will be picked up
1610 maybe_warn_unused_parameter = setting;
1611 warn_unused_parameter = (setting && extra_warnings);
1612 warn_unused_variable = setting;
1613 warn_unused_value = setting;
1617 set_Wextra (setting)
1620 extra_warnings = setting;
1621 warn_unused_value = setting;
1622 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1624 /* We save the value of warn_uninitialized, since if they put
1625 -Wuninitialized on the command line, we need to generate a
1626 warning about not using it without also specifying -O. */
1628 warn_uninitialized = 0;
1629 else if (warn_uninitialized != 1)
1630 warn_uninitialized = 2;
1633 /* The following routines are useful in setting all the flags that
1634 -ffast-math and -fno-fast-math imply. */
1637 set_fast_math_flags (set)
1640 flag_trapping_math = !set;
1641 flag_unsafe_math_optimizations = set;
1642 flag_finite_math_only = set;
1643 flag_errno_math = !set;
1645 flag_signaling_nans = 0;
1648 /* Return true iff flags are set as if -ffast-math. */
1650 fast_math_flags_set_p ()
1652 return (!flag_trapping_math
1653 && flag_unsafe_math_optimizations
1654 && flag_finite_math_only
1655 && !flag_errno_math);
1659 /* Output files for assembler code (real compiler output)
1660 and debugging dumps. */
1663 FILE *aux_info_file;
1664 FILE *rtl_dump_file = NULL;
1666 /* Decode the string P as an integral parameter.
1667 If the string is indeed an integer return its numeric value else
1668 issue an Invalid Option error for the option PNAME and return DEFVAL.
1669 If PNAME is zero just return DEFVAL, do not call error. */
1672 read_integral_parameter (p, pname, defval)
1677 const char *endp = p;
1681 if (ISDIGIT (*endp))
1690 error ("invalid option argument `%s'", pname);
1697 /* This calls abort and is used to avoid problems when abort is a macro.
1698 It is used when we need to pass the address of abort. */
1706 /* When `malloc.c' is compiled with `rcheck' defined,
1707 it calls this function to report clobberage. */
1711 const char *s ATTRIBUTE_UNUSED;
1716 /* Return the logarithm of X, base 2, considering X unsigned,
1717 if X is a power of 2. Otherwise, returns -1.
1719 This should be used via the `exact_log2' macro. */
1723 unsigned HOST_WIDE_INT x;
1726 /* Test for 0 or a power of 2. */
1727 if (x == 0 || x != (x & -x))
1729 while ((x >>= 1) != 0)
1734 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1735 If X is 0, return -1.
1737 This should be used via the floor_log2 macro. */
1741 unsigned HOST_WIDE_INT x;
1750 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1751 into ICE messages, which is much more user friendly. */
1754 crash_signal (signo)
1757 internal_error ("%s", strsignal (signo));
1760 /* Arrange to dump core on error. (The regular error message is still
1761 printed first, except in the case of abort().) */
1764 setup_core_dumping ()
1767 signal (SIGABRT, SIG_DFL);
1769 #if defined(HAVE_SETRLIMIT)
1772 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1773 fatal_io_error ("getting core file size maximum limit");
1774 rlim.rlim_cur = rlim.rlim_max;
1775 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1776 fatal_io_error ("setting core file size limit to maximum");
1779 diagnostic_abort_on_error (global_dc);
1783 /* Strip off a legitimate source ending from the input string NAME of
1784 length LEN. Rather than having to know the names used by all of
1785 our front ends, we strip off an ending of a period followed by
1786 up to five characters. (Java uses ".class".) */
1789 strip_off_ending (name, len)
1794 for (i = 2; i < 6 && len > i; i++)
1796 if (name[len - i] == '.')
1798 name[len - i] = '\0';
1804 /* Output a quoted string. */
1807 output_quoted_string (asm_file, string)
1811 #ifdef OUTPUT_QUOTED_STRING
1812 OUTPUT_QUOTED_STRING (asm_file, string);
1816 putc ('\"', asm_file);
1817 while ((c = *string++) != 0)
1821 if (c == '\"' || c == '\\')
1822 putc ('\\', asm_file);
1826 fprintf (asm_file, "\\%03o", (unsigned char) c);
1828 putc ('\"', asm_file);
1832 /* Output NAME into FILE after having turned it into something
1833 usable as an identifier in a target's assembly file. */
1835 output_clean_symbol_name (file, name)
1839 /* Make a copy of NAME. */
1840 char *id = xstrdup (name);
1842 /* Make it look like a valid identifier for an assembler. */
1843 clean_symbol_name (id);
1850 /* Output a file name in the form wanted by System V. */
1853 output_file_directive (asm_file, input_name)
1855 const char *input_name;
1857 int len = strlen (input_name);
1858 const char *na = input_name + len;
1860 /* NA gets INPUT_NAME sans directory names. */
1861 while (na > input_name)
1863 if (IS_DIR_SEPARATOR (na[-1]))
1868 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1869 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1871 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1872 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1874 fprintf (asm_file, "\t.file\t");
1875 output_quoted_string (asm_file, na);
1876 fputc ('\n', asm_file);
1881 /* Routine to open a dump file. Return true if the dump file is enabled. */
1884 open_dump_file (index, decl)
1885 enum dump_file_index index;
1889 const char *open_arg;
1892 if (! dump_file[index].enabled)
1895 timevar_push (TV_DUMP);
1896 if (rtl_dump_file != NULL)
1897 fclose (rtl_dump_file);
1899 sprintf (seq, DUMPFILE_FORMAT, index);
1901 if (! dump_file[index].initialized)
1903 /* If we've not initialized the files, do so now. */
1904 if (graph_dump_format != no_graph
1905 && dump_file[index].graph_dump_p)
1907 dump_name = concat (seq, dump_file[index].extension, NULL);
1908 clean_graph_dump_file (dump_base_name, dump_name);
1911 dump_file[index].initialized = 1;
1917 dump_name = concat (dump_base_name, seq,
1918 dump_file[index].extension, NULL);
1920 rtl_dump_file = fopen (dump_name, open_arg);
1921 if (rtl_dump_file == NULL)
1922 fatal_io_error ("can't open %s", dump_name);
1927 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1928 (*lang_hooks.decl_printable_name) (decl, 2),
1929 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1931 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1932 ? " (unlikely executed)"
1935 timevar_pop (TV_DUMP);
1939 /* Routine to close a dump file. */
1942 close_dump_file (index, func, insns)
1943 enum dump_file_index index;
1944 void (*func) PARAMS ((FILE *, rtx));
1947 if (! rtl_dump_file)
1950 timevar_push (TV_DUMP);
1952 && graph_dump_format != no_graph
1953 && dump_file[index].graph_dump_p)
1958 sprintf (seq, DUMPFILE_FORMAT, index);
1959 suffix = concat (seq, dump_file[index].extension, NULL);
1960 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1965 func (rtl_dump_file, insns);
1967 fflush (rtl_dump_file);
1968 fclose (rtl_dump_file);
1970 rtl_dump_file = NULL;
1971 timevar_pop (TV_DUMP);
1974 /* Do any final processing required for the declarations in VEC, of
1975 which there are LEN. We write out inline functions and variables
1976 that have been deferred until this point, but which are required.
1977 Returns nonzero if anything was put out. */
1980 wrapup_global_declarations (vec, len)
1987 int output_something = 0;
1989 for (i = 0; i < len; i++)
1993 /* We're not deferring this any longer. Assignment is
1994 conditional to avoid needlessly dirtying PCH pages. */
1995 if (DECL_DEFER_OUTPUT (decl) != 0)
1996 DECL_DEFER_OUTPUT (decl) = 0;
1998 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1999 (*lang_hooks.finish_incomplete_decl) (decl);
2002 /* Now emit any global variables or functions that we have been
2003 putting off. We need to loop in case one of the things emitted
2004 here references another one which comes earlier in the list. */
2008 for (i = 0; i < len; i++)
2012 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
2015 /* Don't write out static consts, unless we still need them.
2017 We also keep static consts if not optimizing (for debugging),
2018 unless the user specified -fno-keep-static-consts.
2019 ??? They might be better written into the debug information.
2020 This is possible when using DWARF.
2022 A language processor that wants static constants to be always
2023 written out (even if it is not used) is responsible for
2024 calling rest_of_decl_compilation itself. E.g. the C front-end
2025 calls rest_of_decl_compilation from finish_decl.
2026 One motivation for this is that is conventional in some
2027 environments to write things like:
2028 static const char rcsid[] = "... version string ...";
2029 intending to force the string to be in the executable.
2031 A language processor that would prefer to have unneeded
2032 static constants "optimized away" would just defer writing
2033 them out until here. E.g. C++ does this, because static
2034 constants are often defined in header files.
2036 ??? A tempting alternative (for both C and C++) would be
2037 to force a constant to be written if and only if it is
2038 defined in a main file, as opposed to an include file. */
2040 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2044 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2046 else if (DECL_COMDAT (decl))
2048 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
2049 && (optimize || !flag_keep_static_consts
2050 || DECL_ARTIFICIAL (decl)))
2056 rest_of_decl_compilation (decl, NULL, 1, 1);
2060 if (TREE_CODE (decl) == FUNCTION_DECL
2061 && DECL_INITIAL (decl) != 0
2062 && DECL_SAVED_INSNS (decl) != 0
2063 && (flag_keep_inline_functions
2064 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2065 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2068 output_inline_function (decl);
2073 output_something = 1;
2077 return output_something;
2080 /* Issue appropriate warnings for the global declarations in VEC (of
2081 which there are LEN). Output debugging information for them. */
2084 check_global_declarations (vec, len)
2091 for (i = 0; i < len; i++)
2095 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2096 && ! TREE_ASM_WRITTEN (decl))
2097 /* Cancel the RTL for this decl so that, if debugging info
2098 output for global variables is still to come,
2099 this one will be omitted. */
2100 SET_DECL_RTL (decl, NULL_RTX);
2102 /* Warn about any function
2103 declared static but not defined.
2104 We don't warn about variables,
2105 because many programs have static variables
2106 that exist only to get some text into the object file. */
2107 if (TREE_CODE (decl) == FUNCTION_DECL
2108 && (warn_unused_function
2109 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2110 && DECL_INITIAL (decl) == 0
2111 && DECL_EXTERNAL (decl)
2112 && ! DECL_ARTIFICIAL (decl)
2113 && ! TREE_PUBLIC (decl))
2115 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2116 pedwarn_with_decl (decl,
2117 "`%s' used but never defined");
2119 warning_with_decl (decl,
2120 "`%s' declared `static' but never defined");
2121 /* This symbol is effectively an "extern" declaration now. */
2122 TREE_PUBLIC (decl) = 1;
2123 assemble_external (decl);
2126 /* Warn about static fns or vars defined but not used. */
2127 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2128 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2129 && ! TREE_USED (decl)
2130 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2131 to handle multiple external decls in different scopes. */
2132 && ! TREE_USED (DECL_NAME (decl))
2133 && ! DECL_EXTERNAL (decl)
2134 && ! TREE_PUBLIC (decl)
2135 /* Global register variables must be declared to reserve them. */
2136 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2137 /* Otherwise, ask the language. */
2138 && (*lang_hooks.decls.warn_unused_global) (decl))
2139 warning_with_decl (decl, "`%s' defined but not used");
2141 /* Avoid confusing the debug information machinery when there are
2143 if (errorcount == 0 && sorrycount == 0)
2145 timevar_push (TV_SYMOUT);
2146 (*debug_hooks->global_decl) (decl);
2147 timevar_pop (TV_SYMOUT);
2152 /* Save the current INPUT_LOCATION on the top entry in the
2153 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2154 INPUT_LOCATION accordingly. */
2157 push_srcloc (file, line)
2161 struct file_stack *fs;
2163 if (input_file_stack)
2164 input_file_stack->location = input_location;
2166 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2167 input_filename = file;
2169 fs->location = input_location;
2170 fs->next = input_file_stack;
2171 input_file_stack = fs;
2172 input_file_stack_tick++;
2175 /* Pop the top entry off the stack of presently open source files.
2176 Restore the INPUT_LOCATION from the new topmost entry on the
2182 struct file_stack *fs;
2184 fs = input_file_stack;
2185 input_file_stack = fs->next;
2187 input_file_stack_tick++;
2189 if (input_file_stack)
2190 input_location = input_file_stack->location;
2193 input_filename = NULL;
2198 /* Compile an entire translation unit. Write a file of assembly
2199 output and various debugging dumps. */
2204 /* Initialize yet another pass. */
2206 init_final (main_input_filename);
2207 coverage_init (aux_base_name);
2209 timevar_push (TV_PARSE);
2211 /* Call the parser, which parses the entire file (calling
2212 rest_of_compilation for each function). */
2213 (*lang_hooks.parse_file) (set_yydebug);
2215 /* In case there were missing block closers,
2216 get us back to the global binding level. */
2217 (*lang_hooks.clear_binding_stack) ();
2219 /* Compilation is now finished except for writing
2220 what's left of the symbol table output. */
2221 timevar_pop (TV_PARSE);
2223 if (flag_syntax_only)
2226 (*lang_hooks.decls.final_write_globals)();
2228 /* This must occur after the loop to output deferred functions.
2229 Else the coverage initializer would not be emitted if all the
2230 functions in this compilation unit were deferred. */
2233 /* Write out any pending weak symbol declarations. */
2237 /* Do dbx symbols. */
2238 timevar_push (TV_SYMOUT);
2240 #ifdef DWARF2_UNWIND_INFO
2241 if (dwarf2out_do_frame ())
2242 dwarf2out_frame_finish ();
2245 (*debug_hooks->finish) (main_input_filename);
2246 timevar_pop (TV_SYMOUT);
2248 /* Output some stuff at end of file if nec. */
2250 dw2_output_indirect_constants ();
2252 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2254 timevar_push (TV_DUMP);
2255 open_dump_file (DFI_bp, NULL);
2259 close_dump_file (DFI_bp, NULL, NULL_RTX);
2260 timevar_pop (TV_DUMP);
2264 ASM_FILE_END (asm_out_file);
2267 /* Attach a special .ident directive to the end of the file to identify
2268 the version of GCC which compiled this code. The format of the .ident
2269 string is patterned after the ones produced by native SVR4 compilers. */
2272 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2273 IDENT_ASM_OP, version_string);
2276 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2278 timevar_push (TV_DUMP);
2279 dump_combine_total_stats (rtl_dump_file);
2280 close_dump_file (DFI_combine, NULL, NULL_RTX);
2281 timevar_pop (TV_DUMP);
2285 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2286 and TYPE_DECL nodes.
2288 This does nothing for local (non-static) variables, unless the
2289 variable is a register variable with an ASMSPEC. In that case, or
2290 if the variable is not an automatic, it sets up the RTL and
2291 outputs any assembler code (label definition, storage allocation
2292 and initialization).
2294 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2295 the assembler symbol name to be used. TOP_LEVEL is nonzero
2296 if this declaration is not within a function. */
2299 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2301 const char *asmspec;
2305 /* We deferred calling assemble_alias so that we could collect
2306 other attributes such as visibility. Emit the alias now. */
2309 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2312 alias = TREE_VALUE (TREE_VALUE (alias));
2313 alias = get_identifier (TREE_STRING_POINTER (alias));
2314 assemble_alias (decl, alias);
2318 /* Forward declarations for nested functions are not "external",
2319 but we need to treat them as if they were. */
2320 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2321 || TREE_CODE (decl) == FUNCTION_DECL)
2323 timevar_push (TV_VARCONST);
2326 make_decl_rtl (decl, asmspec);
2328 /* Don't output anything when a tentative file-scope definition
2329 is seen. But at end of compilation, do output code for them. */
2330 if (at_end || !DECL_DEFER_OUTPUT (decl))
2331 assemble_variable (decl, top_level, at_end, 0);
2333 #ifdef ASM_FINISH_DECLARE_OBJECT
2334 if (decl == last_assemble_variable_decl)
2336 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2341 timevar_pop (TV_VARCONST);
2343 else if (DECL_REGISTER (decl) && asmspec != 0)
2345 if (decode_reg_name (asmspec) >= 0)
2347 SET_DECL_RTL (decl, NULL_RTX);
2348 make_decl_rtl (decl, asmspec);
2352 error ("invalid register name `%s' for register variable", asmspec);
2353 DECL_REGISTER (decl) = 0;
2358 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2359 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2360 && TREE_CODE (decl) == TYPE_DECL)
2362 timevar_push (TV_SYMOUT);
2363 dbxout_symbol (decl, 0);
2364 timevar_pop (TV_SYMOUT);
2367 #ifdef SDB_DEBUGGING_INFO
2368 else if (write_symbols == SDB_DEBUG && top_level
2369 && TREE_CODE (decl) == TYPE_DECL)
2371 timevar_push (TV_SYMOUT);
2372 sdbout_symbol (decl, 0);
2373 timevar_pop (TV_SYMOUT);
2376 #ifdef DWARF2_DEBUGGING_INFO
2377 else if ((write_symbols == DWARF2_DEBUG
2378 || write_symbols == VMS_AND_DWARF2_DEBUG)
2380 && TREE_CODE (decl) == TYPE_DECL)
2382 timevar_push (TV_SYMOUT);
2383 dwarf2out_decl (decl);
2384 timevar_pop (TV_SYMOUT);
2389 /* Called after finishing a record, union or enumeral type. */
2392 rest_of_type_compilation (type, toplev)
2393 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2394 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2398 tree type ATTRIBUTE_UNUSED;
2399 int toplev ATTRIBUTE_UNUSED;
2402 /* Avoid confusing the debug information machinery when there are
2404 if (errorcount != 0 || sorrycount != 0)
2407 timevar_push (TV_SYMOUT);
2408 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2409 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2410 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2412 #ifdef SDB_DEBUGGING_INFO
2413 if (write_symbols == SDB_DEBUG)
2414 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2416 #ifdef DWARF2_DEBUGGING_INFO
2417 if ((write_symbols == DWARF2_DEBUG
2418 || write_symbols == VMS_AND_DWARF2_DEBUG)
2420 dwarf2out_decl (TYPE_STUB_DECL (type));
2422 timevar_pop (TV_SYMOUT);
2425 /* This is called from finish_function (within langhooks.parse_file)
2426 after each top-level definition is parsed.
2427 It is supposed to compile that function or variable
2428 and output the assembler code for it.
2429 After we return, the tree storage is freed. */
2432 rest_of_compilation (decl)
2438 int rebuild_label_notes_after_reload;
2440 timevar_push (TV_REST_OF_COMPILATION);
2442 /* Now that we're out of the frontend, we shouldn't have any more
2443 CONCATs anywhere. */
2444 generating_concat_p = 0;
2446 /* When processing delayed functions, prepare_function_start() won't
2447 have been run to re-initialize it. */
2448 cse_not_expected = ! optimize;
2450 /* First, make sure that NOTE_BLOCK is set correctly for each
2451 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2452 if (!cfun->x_whole_function_mode_p)
2455 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2456 tree in sensible shape. So, we just recalculate it here. */
2457 if (cfun->x_whole_function_mode_p)
2462 /* If we are reconsidering an inline function
2463 at the end of compilation, skip the stuff for making it inline. */
2465 if (DECL_SAVED_INSNS (decl) == 0)
2471 /* If this is nested inside an inlined external function, pretend
2472 it was only declared. Since we cannot inline such functions,
2473 generating code for this one is not only not necessary but will
2474 confuse some debugging output writers. */
2475 for (parent = DECL_CONTEXT (current_function_decl);
2476 parent != NULL_TREE;
2477 parent = get_containing_scope (parent))
2478 if (TREE_CODE (parent) == FUNCTION_DECL
2479 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2481 DECL_INITIAL (decl) = 0;
2482 goto exit_rest_of_compilation;
2484 else if (TYPE_P (parent))
2485 /* A function in a local class should be treated normally. */
2488 /* If requested, consider whether to make this function inline. */
2489 if ((DECL_INLINE (decl) && !flag_no_inline)
2490 || flag_inline_functions)
2492 timevar_push (TV_INTEGRATION);
2493 lose = function_cannot_inline_p (decl);
2494 timevar_pop (TV_INTEGRATION);
2495 if (lose || ! optimize)
2497 if (warn_inline && DECL_INLINE (decl))
2498 warning_with_decl (decl, lose);
2499 DECL_ABSTRACT_ORIGIN (decl) = 0;
2500 /* Don't really compile an extern inline function.
2501 If we can't make it inline, pretend
2502 it was only declared. */
2503 if (DECL_EXTERNAL (decl))
2505 DECL_INITIAL (decl) = 0;
2506 goto exit_rest_of_compilation;
2510 /* ??? Note that we used to just make it look like if
2511 the "inline" keyword was specified when we decide
2512 to inline it (because of -finline-functions).
2513 garloff@suse.de, 2002-04-24: Add another flag to
2514 actually record this piece of information. */
2515 if (!DECL_INLINE (decl))
2516 DID_INLINE_FUNC (decl) = 1;
2517 inlinable = DECL_INLINE (decl) = 1;
2521 insns = get_insns ();
2523 /* Dump the rtl code if we are dumping rtl. */
2525 if (open_dump_file (DFI_rtl, decl))
2527 if (DECL_SAVED_INSNS (decl))
2528 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2529 close_dump_file (DFI_rtl, print_rtl, insns);
2532 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2533 sorts of eh initialization. Delay this until after the
2534 initial rtl dump so that we can see the original nesting. */
2535 convert_from_eh_region_ranges ();
2537 /* If function is inline, and we don't yet know whether to
2538 compile it by itself, defer decision till end of compilation.
2539 wrapup_global_declarations will (indirectly) call
2540 rest_of_compilation again for those functions that need to
2541 be output. Also defer those functions that we are supposed
2545 || (DECL_INLINE (decl)
2546 && flag_inline_functions
2547 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2548 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2549 && ! flag_keep_inline_functions)
2550 || DECL_EXTERNAL (decl))))
2551 DECL_DEFER_OUTPUT (decl) = 1;
2553 if (DECL_INLINE (decl))
2554 /* DWARF wants separate debugging info for abstract and
2555 concrete instances of all inline functions, including those
2556 declared inline but not inlined, and those inlined even
2557 though they weren't declared inline. Conveniently, that's
2558 what DECL_INLINE means at this point. */
2559 (*debug_hooks->deferred_inline_function) (decl);
2561 if (DECL_DEFER_OUTPUT (decl))
2563 /* If -Wreturn-type, we have to do a bit of compilation. We just
2564 want to call cleanup the cfg to figure out whether or not we can
2565 fall off the end of the function; we do the minimum amount of
2566 work necessary to make that safe. */
2567 if (warn_return_type)
2569 int saved_optimize = optimize;
2572 rebuild_jump_labels (insns);
2573 find_exception_handler_labels ();
2574 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2575 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2576 optimize = saved_optimize;
2578 /* CFG is no longer maintained up-to-date. */
2579 free_bb_for_insn ();
2582 set_nothrow_function_flags ();
2583 if (current_function_nothrow)
2584 /* Now we know that this can't throw; set the flag for the benefit
2585 of other functions later in this translation unit. */
2586 TREE_NOTHROW (current_function_decl) = 1;
2588 timevar_push (TV_INTEGRATION);
2589 save_for_inline (decl);
2590 timevar_pop (TV_INTEGRATION);
2591 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2592 goto exit_rest_of_compilation;
2595 /* If specified extern inline but we aren't inlining it, we are
2596 done. This goes for anything that gets here with DECL_EXTERNAL
2597 set, not just things with DECL_INLINE. */
2598 if (DECL_EXTERNAL (decl))
2599 goto exit_rest_of_compilation;
2602 /* If we're emitting a nested function, make sure its parent gets
2603 emitted as well. Doing otherwise confuses debug info. */
2606 for (parent = DECL_CONTEXT (current_function_decl);
2607 parent != NULL_TREE;
2608 parent = get_containing_scope (parent))
2609 if (TREE_CODE (parent) == FUNCTION_DECL)
2610 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2613 /* We are now committed to emitting code for this function. Do any
2614 preparation, such as emitting abstract debug info for the inline
2615 before it gets mangled by optimization. */
2616 if (DECL_INLINE (decl))
2617 (*debug_hooks->outlining_inline_function) (decl);
2619 /* Remove any notes we don't need. That will make iterating
2620 over the instruction sequence faster, and allow the garbage
2621 collector to reclaim the memory used by the notes. */
2622 remove_unnecessary_notes ();
2627 /* Initialize some variables used by the optimizers. */
2628 init_function_for_compilation ();
2630 if (! DECL_DEFER_OUTPUT (decl))
2631 TREE_ASM_WRITTEN (decl) = 1;
2633 /* Now that integrate will no longer see our rtl, we need not
2634 distinguish between the return value of this function and the
2635 return value of called functions. Also, we can remove all SETs
2636 of subregs of hard registers; they are only here because of
2637 integrate. Also, we can now initialize pseudos intended to
2638 carry magic hard reg data throughout the function. */
2639 rtx_equal_function_value_matters = 0;
2640 purge_hard_subreg_sets (get_insns ());
2642 /* Early return if there were errors. We can run afoul of our
2643 consistency checks, and there's not really much point in fixing them.
2644 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2645 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2646 || errorcount || sorrycount)
2647 goto exit_rest_of_compilation;
2649 timevar_push (TV_JUMP);
2650 open_dump_file (DFI_sibling, decl);
2651 insns = get_insns ();
2652 rebuild_jump_labels (insns);
2653 find_exception_handler_labels ();
2654 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2656 delete_unreachable_blocks ();
2658 /* We have to issue these warnings now already, because CFG cleanups
2659 further down may destroy the required information. */
2660 check_function_return_warnings ();
2662 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2663 if (flag_guess_branch_prob)
2665 timevar_push (TV_BRANCH_PROB);
2666 note_prediction_to_br_prob ();
2667 timevar_pop (TV_BRANCH_PROB);
2670 /* We may have potential sibling or tail recursion sites. Select one
2671 (of possibly multiple) methods of performing the call. */
2672 if (flag_optimize_sibling_calls)
2675 optimize_sibling_and_tail_recursive_calls ();
2677 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2678 free_bb_for_insn ();
2679 find_exception_handler_labels ();
2680 rebuild_jump_labels (insns);
2681 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2683 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2684 notes before simplifying cfg and we must do lowering after sibcall
2685 that unhides parts of RTL chain and cleans up the CFG.
2687 Until sibcall is replaced by tree-level optimizer, lets just
2688 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2689 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2690 if (GET_CODE (insn) == NOTE
2691 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2694 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2695 timevar_pop (TV_JUMP);
2697 scope_to_insns_initialize ();
2698 /* Complete generation of exception handling code. */
2701 timevar_push (TV_JUMP);
2702 open_dump_file (DFI_eh, decl);
2704 finish_eh_generation ();
2706 close_dump_file (DFI_eh, print_rtl, get_insns ());
2707 timevar_pop (TV_JUMP);
2710 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2711 generation, which might create new sets. */
2712 emit_initial_value_sets ();
2715 /* If we are doing position-independent code generation, now
2716 is the time to output special prologues and epilogues.
2717 We do not want to do this earlier, because it just clutters
2718 up inline functions with meaningless insns. */
2723 insns = get_insns ();
2725 /* Copy any shared structure that should not be shared. */
2726 unshare_all_rtl (current_function_decl, insns);
2728 #ifdef SETJMP_VIA_SAVE_AREA
2729 /* This must be performed before virtual register instantiation.
2730 Please be aware the everything in the compiler that can look
2731 at the RTL up to this point must understand that REG_SAVE_AREA
2732 is just like a use of the REG contained inside. */
2733 if (current_function_calls_alloca)
2734 optimize_save_area_alloca (insns);
2737 /* Instantiate all virtual registers. */
2738 instantiate_virtual_regs (current_function_decl, insns);
2740 open_dump_file (DFI_jump, decl);
2742 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2743 are initialized and to compute whether control can drop off the end
2746 timevar_push (TV_JUMP);
2747 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2748 before jump optimization switches branch directions. */
2749 if (flag_guess_branch_prob)
2750 expected_value_to_br_prob ();
2752 reg_scan (insns, max_reg_num (), 0);
2753 rebuild_jump_labels (insns);
2754 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2755 delete_trivially_dead_insns (insns, max_reg_num ());
2757 dump_flow_info (rtl_dump_file);
2758 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2759 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2763 free_bb_for_insn ();
2764 copy_loop_headers (insns);
2765 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2767 purge_line_number_notes (insns);
2769 timevar_pop (TV_JUMP);
2770 close_dump_file (DFI_jump, print_rtl, insns);
2772 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2773 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2775 goto exit_rest_of_compilation;
2778 /* Long term, this should probably move before the jump optimizer too,
2779 but I didn't want to disturb the rtl_dump_and_exit and related
2780 stuff at this time. */
2781 if (optimize > 0 && flag_ssa)
2783 /* Convert to SSA form. */
2785 timevar_push (TV_TO_SSA);
2786 open_dump_file (DFI_ssa, decl);
2788 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2791 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2792 timevar_pop (TV_TO_SSA);
2794 /* Perform sparse conditional constant propagation, if requested. */
2797 timevar_push (TV_SSA_CCP);
2798 open_dump_file (DFI_ssa_ccp, decl);
2802 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2803 timevar_pop (TV_SSA_CCP);
2806 /* It would be useful to cleanup the CFG at this point, but block
2807 merging and possibly other transformations might leave a PHI
2808 node in the middle of a basic block, which is a strict no-no. */
2810 /* The SSA implementation uses basic block numbers in its phi
2811 nodes. Thus, changing the control-flow graph or the basic
2812 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2813 may cause problems. */
2817 /* Remove dead code. */
2819 timevar_push (TV_SSA_DCE);
2820 open_dump_file (DFI_ssa_dce, decl);
2822 insns = get_insns ();
2823 ssa_eliminate_dead_code ();
2825 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2826 timevar_pop (TV_SSA_DCE);
2829 /* Convert from SSA form. */
2831 timevar_push (TV_FROM_SSA);
2832 open_dump_file (DFI_ussa, decl);
2834 convert_from_ssa ();
2835 /* New registers have been created. Rescan their usage. */
2836 reg_scan (insns, max_reg_num (), 1);
2838 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2839 timevar_pop (TV_FROM_SSA);
2844 timevar_push (TV_JUMP);
2846 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2848 /* Try to identify useless null pointer tests and delete them. */
2849 if (flag_delete_null_pointer_checks)
2851 open_dump_file (DFI_null, decl);
2853 dump_flow_info (rtl_dump_file);
2855 if (delete_null_pointer_checks (insns))
2856 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2858 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2861 /* Jump optimization, and the removal of NULL pointer checks, may
2862 have reduced the number of instructions substantially. CSE, and
2863 future passes, allocate arrays whose dimensions involve the
2864 maximum instruction UID, so if we can reduce the maximum UID
2865 we'll save big on memory. */
2866 renumber_insns (rtl_dump_file);
2867 timevar_pop (TV_JUMP);
2869 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2873 /* Perform common subexpression elimination.
2874 Nonzero value from `cse_main' means that jumps were simplified
2875 and some code may now be unreachable, so do
2876 jump optimization again. */
2880 open_dump_file (DFI_cse, decl);
2882 dump_flow_info (rtl_dump_file);
2883 timevar_push (TV_CSE);
2885 reg_scan (insns, max_reg_num (), 1);
2887 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2889 rebuild_jump_labels (insns);
2890 purge_all_dead_edges (0);
2892 delete_trivially_dead_insns (insns, max_reg_num ());
2894 /* If we are not running more CSE passes, then we are no longer
2895 expecting CSE to be run. But always rerun it in a cheap mode. */
2896 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2898 if (tem || optimize > 1)
2899 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2900 /* Try to identify useless null pointer tests and delete them. */
2901 if (flag_delete_null_pointer_checks)
2903 timevar_push (TV_JUMP);
2905 if (delete_null_pointer_checks (insns))
2906 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2907 timevar_pop (TV_JUMP);
2910 /* The second pass of jump optimization is likely to have
2911 removed a bunch more instructions. */
2912 renumber_insns (rtl_dump_file);
2914 timevar_pop (TV_CSE);
2915 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2918 open_dump_file (DFI_addressof, decl);
2920 purge_addressof (insns);
2922 purge_all_dead_edges (0);
2923 reg_scan (insns, max_reg_num (), 1);
2925 close_dump_file (DFI_addressof, print_rtl, insns);
2929 /* Perform global cse. */
2931 if (optimize > 0 && flag_gcse)
2933 int save_csb, save_cfj;
2936 timevar_push (TV_GCSE);
2937 open_dump_file (DFI_gcse, decl);
2939 tem = gcse_main (insns, rtl_dump_file);
2940 rebuild_jump_labels (insns);
2941 delete_trivially_dead_insns (insns, max_reg_num ());
2943 save_csb = flag_cse_skip_blocks;
2944 save_cfj = flag_cse_follow_jumps;
2945 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2947 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2948 if (current_function_calls_constant_p)
2949 purge_builtin_constant_p ();
2951 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2953 if (flag_expensive_optimizations)
2955 timevar_push (TV_CSE);
2956 reg_scan (insns, max_reg_num (), 1);
2957 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2958 purge_all_dead_edges (0);
2959 delete_trivially_dead_insns (insns, max_reg_num ());
2960 timevar_pop (TV_CSE);
2961 cse_not_expected = !flag_rerun_cse_after_loop;
2964 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2965 things up. Then possibly re-run CSE again. */
2969 timevar_push (TV_JUMP);
2970 rebuild_jump_labels (insns);
2971 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2972 timevar_pop (TV_JUMP);
2974 if (flag_expensive_optimizations)
2976 timevar_push (TV_CSE);
2977 reg_scan (insns, max_reg_num (), 1);
2978 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2979 purge_all_dead_edges (0);
2980 delete_trivially_dead_insns (insns, max_reg_num ());
2981 timevar_pop (TV_CSE);
2985 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2986 timevar_pop (TV_GCSE);
2989 flag_cse_skip_blocks = save_csb;
2990 flag_cse_follow_jumps = save_cfj;
2991 #ifdef ENABLE_CHECKING
2992 verify_flow_info ();
2996 /* Move constant computations out of loops. */
2998 if (optimize > 0 && flag_loop_optimize)
3000 int do_unroll, do_prefetch;
3002 timevar_push (TV_LOOP);
3003 delete_dead_jumptables ();
3004 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3005 open_dump_file (DFI_loop, decl);
3006 /* CFG is no longer maintained up-to-date. */
3007 free_bb_for_insn ();
3009 if (flag_unroll_loops)
3010 do_unroll = 0; /* Having two unrollers is useless. */
3012 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3013 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3014 if (flag_rerun_loop_opt)
3016 cleanup_barriers ();
3018 /* We only want to perform unrolling once. */
3019 loop_optimize (insns, rtl_dump_file, do_unroll);
3022 /* The first call to loop_optimize makes some instructions
3023 trivially dead. We delete those instructions now in the
3024 hope that doing so will make the heuristics in loop work
3025 better and possibly speed up compilation. */
3026 delete_trivially_dead_insns (insns, max_reg_num ());
3028 /* The regscan pass is currently necessary as the alias
3029 analysis code depends on this information. */
3030 reg_scan (insns, max_reg_num (), 1);
3032 cleanup_barriers ();
3033 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3035 /* Loop can create trivially dead instructions. */
3036 delete_trivially_dead_insns (insns, max_reg_num ());
3037 close_dump_file (DFI_loop, print_rtl, insns);
3038 timevar_pop (TV_LOOP);
3039 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3044 /* Perform jump bypassing and control flow optimizations. */
3045 if (optimize > 0 && flag_gcse)
3047 timevar_push (TV_BYPASS);
3048 open_dump_file (DFI_bypass, decl);
3050 cleanup_cfg (CLEANUP_EXPENSIVE);
3051 tem = bypass_jumps (rtl_dump_file);
3055 rebuild_jump_labels (insns);
3056 cleanup_cfg (CLEANUP_EXPENSIVE);
3057 delete_trivially_dead_insns (insns, max_reg_num ());
3060 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
3061 timevar_pop (TV_BYPASS);
3065 #ifdef ENABLE_CHECKING
3066 verify_flow_info ();
3070 /* Do control and data flow analysis; wrote some of the results to
3073 timevar_push (TV_FLOW);
3074 open_dump_file (DFI_cfg, decl);
3076 dump_flow_info (rtl_dump_file);
3078 cleanup_cfg (CLEANUP_EXPENSIVE
3079 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3081 /* It may make more sense to mark constant functions after dead code is
3082 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3083 may insert code making function non-constant, but we still must consider
3084 it as constant, otherwise -fbranch-probabilities will not read data back.
3086 life_analysis rarely eliminates modification of external memory.
3089 mark_constant_function ();
3091 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3093 /* Do branch profiling and static profile estimation passes. */
3094 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3098 timevar_push (TV_BRANCH_PROB);
3099 open_dump_file (DFI_bp, decl);
3100 if (cfun->arc_profile || flag_branch_probabilities)
3103 /* Discover and record the loop depth at the head of each basic
3104 block. The loop infrastructure does the real job for us. */
3105 flow_loops_find (&loops, LOOP_TREE);
3108 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3110 /* Estimate using heuristics if no profiling info is available. */
3111 if (flag_guess_branch_prob)
3112 estimate_probability (&loops);
3114 flow_loops_free (&loops);
3115 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3116 timevar_pop (TV_BRANCH_PROB);
3120 open_dump_file (DFI_ce1, decl);
3121 if (flag_if_conversion)
3123 timevar_push (TV_IFCVT);
3125 dump_flow_info (rtl_dump_file);
3126 cleanup_cfg (CLEANUP_EXPENSIVE);
3127 reg_scan (insns, max_reg_num (), 0);
3129 timevar_pop (TV_IFCVT);
3131 timevar_push (TV_JUMP);
3132 cleanup_cfg (CLEANUP_EXPENSIVE);
3133 reg_scan (insns, max_reg_num (), 0);
3134 timevar_pop (TV_JUMP);
3135 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3139 timevar_push (TV_TRACER);
3140 open_dump_file (DFI_tracer, decl);
3142 dump_flow_info (rtl_dump_file);
3144 cleanup_cfg (CLEANUP_EXPENSIVE);
3145 reg_scan (insns, max_reg_num (), 0);
3146 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3147 timevar_pop (TV_TRACER);
3150 /* Perform loop optimalizations. It might be better to do them a bit
3151 sooner, but we want the profile feedback to work more efficiently. */
3153 && (flag_unswitch_loops
3155 || flag_unroll_loops))
3157 struct loops *loops;
3158 timevar_push (TV_LOOP);
3159 open_dump_file (DFI_loop2, decl);
3161 dump_flow_info (rtl_dump_file);
3163 loops = loop_optimizer_init (rtl_dump_file);
3167 /* The optimalizations: */
3168 if (flag_unswitch_loops)
3169 unswitch_loops (loops);
3171 if (flag_peel_loops || flag_unroll_loops)
3172 unroll_and_peel_loops (loops,
3173 (flag_peel_loops ? UAP_PEEL : 0) |
3174 (flag_unroll_loops ? UAP_UNROLL : 0) |
3175 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3177 loop_optimizer_finalize (loops, rtl_dump_file);
3180 cleanup_cfg (CLEANUP_EXPENSIVE);
3181 delete_trivially_dead_insns (insns, max_reg_num ());
3182 reg_scan (insns, max_reg_num (), 0);
3184 dump_flow_info (rtl_dump_file);
3185 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3186 timevar_pop (TV_LOOP);
3190 if (flag_rerun_cse_after_loop)
3192 timevar_push (TV_CSE2);
3193 open_dump_file (DFI_cse2, decl);
3195 dump_flow_info (rtl_dump_file);
3196 /* CFG is no longer maintained up-to-date. */
3197 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3198 purge_all_dead_edges (0);
3199 delete_trivially_dead_insns (insns, max_reg_num ());
3203 timevar_push (TV_JUMP);
3204 rebuild_jump_labels (insns);
3205 cleanup_cfg (CLEANUP_EXPENSIVE);
3206 timevar_pop (TV_JUMP);
3208 reg_scan (insns, max_reg_num (), 0);
3209 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3211 timevar_pop (TV_CSE2);
3214 cse_not_expected = 1;
3216 open_dump_file (DFI_life, decl);
3219 #ifdef ENABLE_CHECKING
3220 verify_flow_info ();
3222 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3224 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3225 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3226 timevar_pop (TV_FLOW);
3228 if (warn_uninitialized)
3230 uninitialized_vars_warning (DECL_INITIAL (decl));
3232 setjmp_args_warning ();
3237 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3239 /* Insns were inserted, and possibly pseudos created, so
3240 things might look a bit different. */
3241 insns = get_insns ();
3242 allocate_reg_life_data ();
3243 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3244 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
3250 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3254 /* If -opt, try combining insns through substitution. */
3258 int rebuild_jump_labels_after_combine = 0;
3260 timevar_push (TV_COMBINE);
3261 open_dump_file (DFI_combine, decl);
3263 rebuild_jump_labels_after_combine
3264 = combine_instructions (insns, max_reg_num ());
3266 /* Combining insns may have turned an indirect jump into a
3267 direct jump. Rebuild the JUMP_LABEL fields of jumping
3269 if (rebuild_jump_labels_after_combine)
3271 timevar_push (TV_JUMP);
3272 rebuild_jump_labels (insns);
3273 timevar_pop (TV_JUMP);
3275 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3278 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3279 timevar_pop (TV_COMBINE);
3284 /* Rerun if-conversion, as combine may have simplified things enough to
3285 now meet sequence length restrictions. */
3286 if (flag_if_conversion)
3288 timevar_push (TV_IFCVT);
3289 open_dump_file (DFI_ce2, decl);
3295 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3296 timevar_pop (TV_IFCVT);
3299 /* Register allocation pre-pass, to reduce number of moves
3300 necessary for two-address machines. */
3301 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3303 timevar_push (TV_REGMOVE);
3304 open_dump_file (DFI_regmove, decl);
3306 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3308 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3309 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3310 timevar_pop (TV_REGMOVE);
3315 /* Do unconditional splitting before register allocation to allow machine
3316 description to add extra information not needed previously. */
3317 split_all_insns (1);
3319 #ifdef OPTIMIZE_MODE_SWITCHING
3320 timevar_push (TV_MODE_SWITCH);
3323 optimize_mode_switching (NULL);
3326 timevar_pop (TV_MODE_SWITCH);
3329 /* Any of the several passes since flow1 will have munged register
3330 lifetime data a bit. We need it to be up to date for scheduling
3331 (see handling of reg_known_equiv in init_alias_analysis). */
3332 recompute_reg_usage (insns, !optimize_size);
3334 timevar_push (TV_SCHED);
3336 #ifdef INSN_SCHEDULING
3338 /* Print function header into sched dump now
3339 because doing the sched analysis makes some of the dump. */
3340 if (optimize > 0 && flag_schedule_insns)
3342 open_dump_file (DFI_sched, decl);
3344 /* Do control and data sched analysis,
3345 and write some of the results to dump file. */
3347 schedule_insns (rtl_dump_file);
3349 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3352 timevar_pop (TV_SCHED);
3356 /* Determine if the current function is a leaf before running reload
3357 since this can impact optimizations done by the prologue and
3358 epilogue thus changing register elimination offsets. */
3359 current_function_is_leaf = leaf_function_p ();
3361 timevar_push (TV_LOCAL_ALLOC);
3362 open_dump_file (DFI_lreg, decl);
3364 /* Allocate pseudo-regs that are used only within 1 basic block.
3366 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3367 jump optimizer after register allocation and reloading are finished. */
3369 if (flag_new_regalloc)
3371 delete_trivially_dead_insns (insns, max_reg_num ());
3374 timevar_pop (TV_LOCAL_ALLOC);
3375 if (dump_file[DFI_lreg].enabled)
3377 timevar_push (TV_DUMP);
3379 close_dump_file (DFI_lreg, NULL, NULL);
3380 timevar_pop (TV_DUMP);
3383 /* XXX clean up the whole mess to bring live info in shape again. */
3384 timevar_push (TV_GLOBAL_ALLOC);
3385 open_dump_file (DFI_greg, decl);
3387 build_insn_chain (insns);
3388 failure = reload (insns, 0);
3390 timevar_pop (TV_GLOBAL_ALLOC);
3392 if (dump_file[DFI_greg].enabled)
3394 timevar_push (TV_DUMP);
3396 dump_global_regs (rtl_dump_file);
3398 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3399 timevar_pop (TV_DUMP);
3403 goto exit_rest_of_compilation;
3404 reload_completed = 1;
3405 rebuild_label_notes_after_reload = 0;
3409 /* Allocate the reg_renumber array. */
3410 allocate_reg_info (max_regno, FALSE, TRUE);
3412 /* And the reg_equiv_memory_loc array. */
3413 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3415 allocate_initial_values (reg_equiv_memory_loc);
3417 regclass (insns, max_reg_num (), rtl_dump_file);
3418 rebuild_label_notes_after_reload = local_alloc ();
3420 timevar_pop (TV_LOCAL_ALLOC);
3422 if (dump_file[DFI_lreg].enabled)
3424 timevar_push (TV_DUMP);
3426 dump_flow_info (rtl_dump_file);
3427 dump_local_alloc (rtl_dump_file);
3429 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3430 timevar_pop (TV_DUMP);
3435 timevar_push (TV_GLOBAL_ALLOC);
3436 open_dump_file (DFI_greg, decl);
3438 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3439 pass fixing up any insns that are invalid. */
3442 failure = global_alloc (rtl_dump_file);
3445 build_insn_chain (insns);
3446 failure = reload (insns, 0);
3449 timevar_pop (TV_GLOBAL_ALLOC);
3451 if (dump_file[DFI_greg].enabled)
3453 timevar_push (TV_DUMP);
3455 dump_global_regs (rtl_dump_file);
3457 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3458 timevar_pop (TV_DUMP);
3462 goto exit_rest_of_compilation;
3467 open_dump_file (DFI_postreload, decl);
3469 /* Do a very simple CSE pass over just the hard registers. */
3472 timevar_push (TV_RELOAD_CSE_REGS);
3473 reload_cse_regs (insns);
3474 timevar_pop (TV_RELOAD_CSE_REGS);
3477 /* Register allocation and reloading may have turned an indirect jump into
3478 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3479 jumping instructions. */
3480 if (rebuild_label_notes_after_reload)
3482 timevar_push (TV_JUMP);
3484 rebuild_jump_labels (insns);
3485 purge_all_dead_edges (0);
3487 timevar_pop (TV_JUMP);
3490 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3492 /* Re-create the death notes which were deleted during reload. */
3493 timevar_push (TV_FLOW2);
3494 open_dump_file (DFI_flow2, decl);
3496 #ifdef ENABLE_CHECKING
3497 verify_flow_info ();
3500 /* If optimizing, then go ahead and split insns now. */
3504 split_all_insns (0);
3507 cleanup_cfg (CLEANUP_EXPENSIVE);
3509 /* On some machines, the prologue and epilogue code, or parts thereof,
3510 can be represented as RTL. Doing so lets us schedule insns between
3511 it and the rest of the code and also allows delayed branch
3512 scheduling to operate in the epilogue. */
3513 thread_prologue_and_epilogue_insns (insns);
3517 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3518 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3519 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3521 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3522 even for machines with possibly nonzero RETURN_POPS_ARGS
3523 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3524 push instructions will have popping returns. */
3525 #ifndef PUSH_ROUNDING
3526 if (!ACCUMULATE_OUTGOING_ARGS)
3528 combine_stack_adjustments ();
3533 flow2_completed = 1;
3535 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3536 timevar_pop (TV_FLOW2);
3538 #ifdef HAVE_peephole2
3539 if (optimize > 0 && flag_peephole2)
3541 timevar_push (TV_PEEPHOLE2);
3542 open_dump_file (DFI_peephole2, decl);
3544 peephole2_optimize (rtl_dump_file);
3546 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3547 timevar_pop (TV_PEEPHOLE2);
3551 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3553 timevar_push (TV_RENAME_REGISTERS);
3554 open_dump_file (DFI_rnreg, decl);
3556 if (flag_rename_registers)
3557 regrename_optimize ();
3558 if (flag_cprop_registers)
3559 copyprop_hardreg_forward ();
3561 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3562 timevar_pop (TV_RENAME_REGISTERS);
3567 timevar_push (TV_REORDER_BLOCKS);
3568 open_dump_file (DFI_bbro, decl);
3570 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3571 splitting possibly introduced more crossjumping opportunities. */
3572 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3573 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3575 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
3577 if (flag_reorder_blocks)
3578 reorder_basic_blocks ();
3579 if (flag_reorder_blocks
3580 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
3581 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3583 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3584 timevar_pop (TV_REORDER_BLOCKS);
3587 if (flag_if_conversion2)
3589 timevar_push (TV_IFCVT2);
3590 open_dump_file (DFI_ce3, decl);
3594 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3595 timevar_pop (TV_IFCVT2);
3598 #ifdef INSN_SCHEDULING
3599 if (optimize > 0 && flag_schedule_insns_after_reload)
3601 timevar_push (TV_SCHED2);
3602 open_dump_file (DFI_sched2, decl);
3604 /* Do control and data sched analysis again,
3605 and write some more of the results to dump file. */
3607 split_all_insns (1);
3609 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
3611 schedule_ebbs (rtl_dump_file);
3612 /* No liveness updating code yet, but it should be easy to do.
3613 reg-stack recompute the liveness when needed for now. */
3614 count_or_remove_death_notes (NULL, 1);
3615 cleanup_cfg (CLEANUP_EXPENSIVE);
3618 schedule_insns (rtl_dump_file);
3620 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3621 timevar_pop (TV_SCHED2);
3627 #ifdef LEAF_REGISTERS
3628 current_function_uses_only_leaf_regs
3629 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3633 timevar_push (TV_REG_STACK);
3634 open_dump_file (DFI_stack, decl);
3636 if (reg_to_stack (insns, rtl_dump_file) && optimize)
3638 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3639 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
3640 && flag_reorder_blocks)
3642 reorder_basic_blocks ();
3643 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3647 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3648 timevar_pop (TV_REG_STACK);
3652 compute_alignments ();
3654 /* CFG is no longer maintained up-to-date. */
3655 free_bb_for_insn ();
3657 /* If a machine dependent reorganization is needed, call it. */
3658 #ifdef MACHINE_DEPENDENT_REORG
3659 timevar_push (TV_MACH_DEP);
3660 open_dump_file (DFI_mach, decl);
3662 MACHINE_DEPENDENT_REORG (insns);
3664 close_dump_file (DFI_mach, print_rtl, insns);
3665 timevar_pop (TV_MACH_DEP);
3670 purge_line_number_notes (insns);
3671 cleanup_barriers ();
3673 /* If a scheduling pass for delayed branches is to be done,
3674 call the scheduling code. */
3677 if (optimize > 0 && flag_delayed_branch)
3679 timevar_push (TV_DBR_SCHED);
3680 open_dump_file (DFI_dbr, decl);
3682 dbr_schedule (insns, rtl_dump_file);
3684 close_dump_file (DFI_dbr, print_rtl, insns);
3685 timevar_pop (TV_DBR_SCHED);
3691 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3692 timevar_push (TV_SHORTEN_BRANCH);
3693 split_all_insns_noflow ();
3694 timevar_pop (TV_SHORTEN_BRANCH);
3697 convert_to_eh_region_ranges ();
3699 /* Shorten branches. */
3700 timevar_push (TV_SHORTEN_BRANCH);
3701 shorten_branches (get_insns ());
3702 timevar_pop (TV_SHORTEN_BRANCH);
3704 set_nothrow_function_flags ();
3705 if (current_function_nothrow)
3706 /* Now we know that this can't throw; set the flag for the benefit
3707 of other functions later in this translation unit. */
3708 TREE_NOTHROW (current_function_decl) = 1;
3710 /* Now turn the rtl into assembler code. */
3712 timevar_push (TV_FINAL);
3717 /* Get the function's name, as described by its RTL. This may be
3718 different from the DECL_NAME name used in the source file. */
3720 x = DECL_RTL (decl);
3721 if (GET_CODE (x) != MEM)
3724 if (GET_CODE (x) != SYMBOL_REF)
3726 fnname = XSTR (x, 0);
3728 assemble_start_function (decl, fnname);
3729 final_start_function (insns, asm_out_file, optimize);
3730 final (insns, asm_out_file, optimize, 0);
3731 final_end_function ();
3733 #ifdef IA64_UNWIND_INFO
3734 /* ??? The IA-64 ".handlerdata" directive must be issued before
3735 the ".endp" directive that closes the procedure descriptor. */
3736 output_function_exception_table ();
3739 assemble_end_function (decl, fnname);
3741 #ifndef IA64_UNWIND_INFO
3742 /* Otherwise, it feels unclean to switch sections in the middle. */
3743 output_function_exception_table ();
3747 fflush (asm_out_file);
3749 /* Release all memory allocated by flow. */
3750 free_basic_block_vars (0);
3752 /* Release all memory held by regsets now. */
3753 regset_release_memory ();
3755 timevar_pop (TV_FINAL);
3759 /* Write DBX symbols if requested. */
3761 /* Note that for those inline functions where we don't initially
3762 know for certain that we will be generating an out-of-line copy,
3763 the first invocation of this routine (rest_of_compilation) will
3764 skip over this code by doing a `goto exit_rest_of_compilation;'.
3765 Later on, wrapup_global_declarations will (indirectly) call
3766 rest_of_compilation again for those inline functions that need
3767 to have out-of-line copies generated. During that call, we
3768 *will* be routed past here. */
3770 timevar_push (TV_SYMOUT);
3771 (*debug_hooks->function_decl) (decl);
3772 timevar_pop (TV_SYMOUT);
3774 exit_rest_of_compilation:
3776 coverage_end_function ();
3778 /* In case the function was not output,
3779 don't leave any temporary anonymous types
3780 queued up for sdb output. */
3781 #ifdef SDB_DEBUGGING_INFO
3782 if (write_symbols == SDB_DEBUG)
3783 sdbout_types (NULL_TREE);
3786 reload_completed = 0;
3787 flow2_completed = 0;
3790 timevar_push (TV_FINAL);
3792 /* Clear out the insn_length contents now that they are no
3794 init_insn_lengths ();
3796 /* Show no temporary slots allocated. */
3799 free_basic_block_vars (0);
3800 free_bb_for_insn ();
3802 timevar_pop (TV_FINAL);
3804 if ((*targetm.binds_local_p) (current_function_decl))
3806 int pref = cfun->preferred_stack_boundary;
3807 if (cfun->recursive_call_emit
3808 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3809 pref = cfun->stack_alignment_needed;
3810 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3814 /* Make sure volatile mem refs aren't considered valid operands for
3815 arithmetic insns. We must call this here if this is a nested inline
3816 function, since the above code leaves us in the init_recog state
3817 (from final.c), and the function context push/pop code does not
3818 save/restore volatile_ok.
3820 ??? Maybe it isn't necessary for expand_start_function to call this
3821 anymore if we do it here? */
3823 init_recog_no_volatile ();
3825 /* We're done with this function. Free up memory if we can. */
3826 free_after_parsing (cfun);
3827 if (! DECL_DEFER_OUTPUT (decl))
3829 free_after_compilation (cfun);
3831 /* Clear integrate.c's pointer to the cfun structure we just
3833 DECL_SAVED_INSNS (decl) = 0;
3839 timevar_pop (TV_REST_OF_COMPILATION);
3849 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3850 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3851 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3852 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3853 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3854 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"));
3855 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3856 printf (_(" -fstack-limit-register=<register> Trap if the stack goes past <register>\n"));
3857 printf (_(" -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>\n"));
3858 printf (_(" -frandom-seed=<string> Make compile reproducible using <string>\n"));
3861 for (i = ARRAY_SIZE (f_options); i--;)
3863 const char *description = f_options[i].description;
3865 if (description != NULL && *description != 0)
3866 printf (" -f%-21s %s\n",
3867 f_options[i].string, _(description));
3870 printf (_(" -O[number] Set optimization level to [number]\n"));
3871 printf (_(" -Os Optimize for space rather than speed\n"));
3872 for (i = LAST_PARAM; i--;)
3874 const char *description = compiler_params[i].help;
3875 const int length = 21 - strlen (compiler_params[i].option);
3877 if (description != NULL && *description != 0)
3878 printf (" --param %s=<value>%.*s%s\n",
3879 compiler_params[i].option,
3880 length > 0 ? length : 1, " ",
3883 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3884 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3885 printf (_(" -w Suppress warnings\n"));
3887 for (i = ARRAY_SIZE (W_options); i--;)
3889 const char *description = W_options[i].description;
3891 if (description != NULL && *description != 0)
3892 printf (" -W%-21s %s\n",
3893 W_options[i].string, _(description));
3896 printf (_(" -Wextra Print extra (possibly unwanted) warnings\n"));
3897 printf (_(" -Wunused Enable unused warnings\n"));
3898 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3899 printf (_(" -p Enable function profiling\n"));
3900 printf (_(" -o <file> Place output into <file> \n"));
3902 -G <number> Put global and static data smaller than <number>\n\
3903 bytes into a special section (on some targets)\n"));
3905 for (i = ARRAY_SIZE (debug_args); i--;)
3907 if (debug_args[i].description != NULL)
3908 printf (" -g%-21s %s\n",
3909 debug_args[i].arg, _(debug_args[i].description));
3912 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3913 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3914 printf (_(" -version Display the compiler's version\n"));
3915 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3916 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3917 #if defined INSN_SCHEDULING
3918 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3920 printf (_(" --help Display this information\n"));
3925 /* Display descriptions of language specific options.
3926 If there is no description, note that there is an undocumented option.
3927 If the description is empty, do not display anything. (This allows
3928 options to be deliberately undocumented, for whatever reason).
3929 If the option string is missing, then this is a marker, indicating
3930 that the description string is in fact the name of a language, whose
3931 language specific options are to follow. */
3933 if (ARRAY_SIZE (documented_lang_options) > 1)
3935 printf (_("\nLanguage specific options:\n"));
3937 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3939 const char *description = documented_lang_options[i].description;
3940 const char *option = documented_lang_options[i].option;
3942 if (description == NULL)
3947 printf (_(" %-23.23s [undocumented]\n"), option);
3949 else if (*description == 0)
3951 else if (option == NULL)
3955 (_("\nThere are undocumented %s specific options as well.\n"),
3959 printf (_("\n Options for %s:\n"), description);
3964 printf (" %-23.23s %s\n", option, _(description));
3969 printf (_("\nThere are undocumented %s specific options as well.\n"),
3972 display_target_options ();
3976 display_target_options ()
3979 static bool displayed = false;
3981 /* Avoid double printing for --help --target-help. */
3986 if (ARRAY_SIZE (target_switches) > 1
3987 #ifdef TARGET_OPTIONS
3988 || ARRAY_SIZE (target_options) > 1
3996 printf (_("\nTarget specific options:\n"));
3998 for (i = ARRAY_SIZE (target_switches); i--;)
4000 const char *option = target_switches[i].name;
4001 const char *description = target_switches[i].description;
4003 if (option == NULL || *option == 0)
4005 else if (description == NULL)
4010 printf (_(" -m%-23.23s [undocumented]\n"), option);
4012 else if (*description != 0)
4013 doc += printf (" -m%-23.23s %s\n", option, _(description));
4016 #ifdef TARGET_OPTIONS
4017 for (i = ARRAY_SIZE (target_options); i--;)
4019 const char *option = target_options[i].prefix;
4020 const char *description = target_options[i].description;
4022 if (option == NULL || *option == 0)
4024 else if (description == NULL)
4029 printf (_(" -m%-23.23s [undocumented]\n"), option);
4031 else if (*description != 0)
4032 doc += printf (" -m%-23.23s %s\n", option, _(description));
4038 printf (_("\nThere are undocumented target specific options as well.\n"));
4040 printf (_(" They exist, but they are not documented.\n"));
4045 /* Parse a -d... command line switch. */
4048 decode_d_option (arg)
4057 for (i = 0; i < (int) DFI_MAX; ++i)
4058 dump_file[i].enabled = 1;
4064 flag_print_asm_name = 1;
4067 flag_dump_rtl_in_asm = 1;
4068 flag_print_asm_name = 1;
4071 graph_dump_format = vcg;
4074 rtl_dump_and_exit = 1;
4079 case 'D': /* These are handled by the preprocessor. */
4083 setup_core_dumping();
4088 for (i = 0; i < (int) DFI_MAX; ++i)
4089 if (c == dump_file[i].debug_switch)
4091 dump_file[i].enabled = 1;
4096 warning ("unrecognized gcc debugging option: %c", c);
4101 /* Parse a -f... command line switch. ARG is the value after the -f.
4102 It is safe to access 'ARG - 2' to generate the full switch name.
4103 Return the number of strings consumed. */
4106 decode_f_option (arg)
4110 const char *option_value = NULL;
4112 /* Search for the option in the table of binary f options. */
4113 for (j = ARRAY_SIZE (f_options); j--;)
4115 if (!strcmp (arg, f_options[j].string))
4117 *f_options[j].variable = f_options[j].on_value;
4121 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4122 && ! strcmp (arg + 3, f_options[j].string))
4124 *f_options[j].variable = ! f_options[j].on_value;
4129 if (!strcmp (arg, "fast-math"))
4130 set_fast_math_flags (1);
4131 else if (!strcmp (arg, "no-fast-math"))
4132 set_fast_math_flags (0);
4133 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4134 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4137 read_integral_parameter (option_value, arg - 2,
4139 set_param_value ("max-inline-insns", val);
4140 set_param_value ("max-inline-insns-single", val/2);
4141 set_param_value ("max-inline-insns-auto", val/2);
4142 set_param_value ("max-inline-insns-rtl", val);
4143 if (val/4 < MIN_INLINE_INSNS)
4146 set_param_value ("min-inline-insns", val/4);
4148 set_param_value ("min-inline-insns", 10);
4151 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4153 if (strcmp (option_value, "global-dynamic") == 0)
4154 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4155 else if (strcmp (option_value, "local-dynamic") == 0)
4156 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4157 else if (strcmp (option_value, "initial-exec") == 0)
4158 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4159 else if (strcmp (option_value, "local-exec") == 0)
4160 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4162 warning ("`%s': unknown tls-model option", arg - 2);
4164 #ifdef INSN_SCHEDULING
4165 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4166 fix_sched_param ("verbose", option_value);
4168 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4169 fix_register (option_value, 1, 1);
4170 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4171 fix_register (option_value, 0, 1);
4172 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4173 fix_register (option_value, 0, 0);
4174 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4175 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4176 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4178 = read_integral_parameter (option_value, arg - 2, align_functions);
4179 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4180 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4181 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4183 = read_integral_parameter (option_value, arg - 2, align_labels);
4184 else if ((option_value
4185 = skip_leading_substring (arg, "stack-limit-register=")))
4187 int reg = decode_reg_name (option_value);
4189 error ("unrecognized register name `%s'", option_value);
4191 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4193 else if ((option_value
4194 = skip_leading_substring (arg, "stack-limit-symbol=")))
4197 nm = ggc_strdup (option_value);
4198 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4200 else if ((option_value
4201 = skip_leading_substring (arg, "message-length=")))
4202 output_set_maximum_length
4203 (&global_dc->buffer, read_integral_parameter
4204 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4205 else if ((option_value
4206 = skip_leading_substring (arg, "diagnostics-show-location=")))
4208 if (!strcmp (option_value, "once"))
4209 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4210 else if (!strcmp (option_value, "every-line"))
4211 diagnostic_prefixing_rule (global_dc)
4212 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4214 error ("unrecognized option `%s'", arg - 2);
4216 else if (!strcmp (arg, "no-stack-limit"))
4217 stack_limit_rtx = NULL_RTX;
4218 else if ((option_value = skip_leading_substring (arg, "random-seed=")))
4219 flag_random_seed = option_value;
4220 else if (!strcmp (arg, "no-random-seed"))
4221 flag_random_seed = NULL;
4222 else if (!strcmp (arg, "preprocessed"))
4223 /* Recognize this switch but do nothing. This prevents warnings
4224 about an unrecognized switch if cpplib has not been linked in. */
4232 /* Parse a -W... command line switch. ARG is the value after the -W.
4233 It is safe to access 'ARG - 2' to generate the full switch name.
4234 Return the number of strings consumed. */
4237 decode_W_option (arg)
4240 const char *option_value = NULL;
4243 /* Search for the option in the table of binary W options. */
4245 for (j = ARRAY_SIZE (W_options); j--;)
4247 if (!strcmp (arg, W_options[j].string))
4249 *W_options[j].variable = W_options[j].on_value;
4253 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4254 && ! strcmp (arg + 3, W_options[j].string))
4256 *W_options[j].variable = ! W_options[j].on_value;
4261 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4262 warning ("-Wid-clash-LEN is no longer supported");
4263 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4265 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4267 warn_larger_than = larger_than_size != -1;
4269 else if (!strcmp (arg, "unused"))
4273 else if (!strcmp (arg, "no-unused"))
4277 else if (!strcmp (arg, "extra"))
4281 else if (!strcmp (arg, "no-extra"))
4291 /* Indexed by enum debug_info_type. */
4292 const char *const debug_type_names[] =
4294 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4297 /* Parse a -g... command line switch. ARG is the value after the -g.
4298 It is safe to access 'ARG - 2' to generate the full switch name.
4299 Return the number of strings consumed. */
4302 decode_g_option (arg)
4305 static unsigned level = 0;
4306 /* A lot of code assumes write_symbols == NO_DEBUG if the
4307 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4308 of what debugging type has been selected). This records the
4309 selected type. It is an error to specify more than one
4311 static enum debug_info_type selected_debug_type = NO_DEBUG;
4312 /* Nonzero if debugging format has been explicitly set.
4313 -g and -ggdb don't explicitly set the debugging format so
4314 -gdwarf -g3 is equivalent to -gdwarf3. */
4315 static int type_explicitly_set_p = 0;
4317 /* The maximum admissible debug level value. */
4318 static const unsigned max_debug_level = 3;
4320 /* Look up ARG in the table. */
4321 for (da = debug_args; da->arg; da++)
4323 const int da_len = strlen (da->arg);
4325 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4327 enum debug_info_type type = da->debug_type;
4328 const char *p = arg + da_len;
4330 if (*p && ! ISDIGIT (*p))
4333 /* A debug flag without a level defaults to level 2.
4334 Note we do not want to call read_integral_parameter
4335 for that case since it will call atoi which
4338 ??? We may want to generalize the interface to
4339 read_integral_parameter to better handle this case
4340 if this case shows up often. */
4342 level = read_integral_parameter (p, 0, max_debug_level + 1);
4344 level = (level == 0) ? 2 : level;
4346 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4348 error ("use -gdwarf -g%d for DWARF v1, level %d",
4351 error ("use -gdwarf-2 for DWARF v2");
4354 if (level > max_debug_level)
4357 ignoring option `%s' due to invalid debug level specification",
4359 level = debug_info_level;
4362 if (type == NO_DEBUG)
4364 type = PREFERRED_DEBUGGING_TYPE;
4366 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4368 #ifdef DWARF2_DEBUGGING_INFO
4369 type = DWARF2_DEBUG;
4371 #ifdef DBX_DEBUGGING_INFO
4378 if (type == NO_DEBUG)
4379 warning ("`%s': unknown or unsupported -g option", arg - 2);
4381 /* Does it conflict with an already selected type? */
4382 if (type_explicitly_set_p
4383 /* -g/-ggdb don't conflict with anything. */
4384 && da->debug_type != NO_DEBUG
4385 && type != selected_debug_type)
4386 warning ("`%s' ignored, conflicts with `-g%s'",
4387 arg - 2, debug_type_names[(int) selected_debug_type]);
4390 /* If the format has already been set, -g/-ggdb
4391 only change the debug level. */
4392 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4393 /* Don't change debugging type. */
4397 selected_debug_type = type;
4398 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4401 write_symbols = (level == 0
4403 : selected_debug_type);
4404 use_gnu_debug_info_extensions = da->use_extensions_p;
4405 debug_info_level = (enum debug_info_level) level;
4418 /* Decode the first argument in the argv as a language-independent option.
4419 Return the number of strings consumed. */
4422 independent_decode_option (argc, argv)
4426 char *arg = argv[0];
4428 if (arg[0] != '-' || arg[1] == 0)
4440 if (!strcmp (arg, "-help"))
4443 exit_after_options = 1;
4447 if (!strcmp (arg, "-target-help"))
4449 display_target_options ();
4450 exit_after_options = 1;
4454 if (!strcmp (arg, "-version"))
4456 print_version (stderr, "");
4457 exit_after_options = 1;
4461 /* Handle '--param <name>=<value>'. */
4462 if (strcmp (arg, "-param") == 0)
4468 error ("-param option missing argument");
4472 /* Get the '<name>=<value>' parameter. */
4474 /* Look for the `='. */
4475 equal = strchr (arg, '=');
4477 error ("invalid --param option: %s", arg);
4482 /* Zero out the `=' sign so that we get two separate strings. */
4484 /* Figure out what value is specified. */
4485 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4486 if (val != INVALID_PARAM_VAL)
4487 set_param_value (arg, val);
4489 error ("invalid parameter value `%s'", equal + 1);
4501 /* Already been treated in main (). Do nothing. */
4505 set_target_switch (arg + 1);
4509 return decode_f_option (arg + 1);
4512 return decode_g_option (arg + 1);
4515 if (!strcmp (arg, "dumpbase"))
4521 dump_base_name = argv[1];
4526 decode_d_option (arg + 1);
4530 if (!strcmp (arg, "pedantic"))
4532 else if (!strcmp (arg, "pedantic-errors"))
4533 flag_pedantic_errors = pedantic = 1;
4534 else if (arg[1] == 0)
4541 if (!strcmp (arg, "quiet"))
4548 if (!strcmp (arg, "version"))
4556 inhibit_warnings = 1;
4562 /* For backward compatibility, -W is the same as -Wextra. */
4566 return decode_W_option (arg + 1);
4570 if (!strncmp (arg, "aux-info", 8))
4577 aux_info_file_name = argv[1];
4578 flag_gen_aux_info = 1;
4581 else if (arg[8] == '=')
4583 aux_info_file_name = arg + 9;
4584 flag_gen_aux_info = 1;
4589 else if (!strcmp (arg, "auxbase"))
4595 aux_base_name = argv[1];
4599 else if (!strcmp (arg, "auxbase-strip"))
4606 strip_off_ending (argv[1], strlen (argv[1]));
4608 aux_base_name = argv[1];
4623 asm_file_name = argv[1];
4638 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4643 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4647 if (g_switch_val == -1)
4651 g_switch_set = TRUE;
4652 g_switch_value = g_switch_val;
4662 /* Decode -m switches. */
4663 /* Decode the switch -mNAME. */
4666 set_target_switch (name)
4670 int valid_target_option = 0;
4672 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4673 if (!strcmp (target_switches[j].name, name))
4675 if (target_switches[j].value < 0)
4676 target_flags &= ~-target_switches[j].value;
4678 target_flags |= target_switches[j].value;
4681 if (target_switches[j].value < 0)
4682 target_flags_explicit |= -target_switches[j].value;
4684 target_flags_explicit |= target_switches[j].value;
4686 valid_target_option = 1;
4689 #ifdef TARGET_OPTIONS
4690 if (!valid_target_option)
4691 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4693 int len = strlen (target_options[j].prefix);
4694 if (target_options[j].value)
4696 if (!strcmp (target_options[j].prefix, name))
4698 *target_options[j].variable = target_options[j].value;
4699 valid_target_option = 1;
4704 if (!strncmp (target_options[j].prefix, name, len))
4706 *target_options[j].variable = name + len;
4707 valid_target_option = 1;
4713 if (!valid_target_option)
4714 error ("invalid option `%s'", name);
4717 /* Print version information to FILE.
4718 Each line begins with INDENT (for the case where FILE is the
4719 assembler output file). */
4722 print_version (file, indent)
4727 #define __VERSION__ "[?]"
4731 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4733 "%s%s%s version %s (%s) compiled by CC.\n"
4735 , indent, *indent != 0 ? " " : "",
4736 lang_hooks.name, version_string, TARGET_NAME,
4737 indent, __VERSION__);
4738 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4739 indent, *indent != 0 ? " " : "",
4740 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4743 /* Print an option value and return the adjusted position in the line.
4744 ??? We don't handle error returns from fprintf (disk full); presumably
4745 other code will catch a disk full though. */
4748 print_single_switch (file, pos, max, indent, sep, term, type, name)
4751 const char *indent, *sep, *term, *type, *name;
4753 /* The ultrix fprintf returns 0 on success, so compute the result we want
4754 here since we need it for the following test. */
4755 int len = strlen (sep) + strlen (type) + strlen (name);
4760 fprintf (file, "%s", term);
4765 fprintf (file, "%s", indent);
4766 pos = strlen (indent);
4768 fprintf (file, "%s%s%s", sep, type, name);
4773 /* Print active target switches to FILE.
4774 POS is the current cursor position and MAX is the size of a "line".
4775 Each line begins with INDENT and ends with TERM.
4776 Each switch is separated from the next by SEP. */
4779 print_switch_values (file, pos, max, indent, sep, term)
4782 const char *indent, *sep, *term;
4787 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4788 that it can be printed below. This helps reproducibility. Of
4789 course, the string may never be used, but we can't tell that at
4790 this point in the compile. */
4791 default_flag_random_seed ();
4793 /* Print the options as passed. */
4795 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4796 _("options passed: "), "");
4798 for (p = &save_argv[1]; *p != NULL; p++)
4802 if (strcmp (*p, "-o") == 0)
4808 if (strcmp (*p, "-quiet") == 0)
4810 if (strcmp (*p, "-version") == 0)
4815 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4818 fprintf (file, "%s", term);
4820 /* Print the -f and -m options that have been enabled.
4821 We don't handle language specific options but printing argv
4824 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4825 _("options enabled: "), "");
4827 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4828 if (*f_options[j].variable == f_options[j].on_value)
4829 pos = print_single_switch (file, pos, max, indent, sep, term,
4830 "-f", f_options[j].string);
4832 /* Print target specific options. */
4834 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4835 if (target_switches[j].name[0] != '\0'
4836 && target_switches[j].value > 0
4837 && ((target_switches[j].value & target_flags)
4838 == target_switches[j].value))
4840 pos = print_single_switch (file, pos, max, indent, sep, term,
4841 "-m", target_switches[j].name);
4844 #ifdef TARGET_OPTIONS
4845 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4846 if (*target_options[j].variable != NULL)
4849 sprintf (prefix, "-m%s", target_options[j].prefix);
4850 pos = print_single_switch (file, pos, max, indent, sep, term,
4851 prefix, *target_options[j].variable);
4855 fprintf (file, "%s", term);
4858 /* Open assembly code output file. Do this even if -fsyntax-only is
4859 on, because then the driver will have provided the name of a
4860 temporary file or bit bucket for us. NAME is the file specified on
4861 the command line, possibly NULL. */
4863 init_asm_output (name)
4866 if (name == NULL && asm_file_name == 0)
4867 asm_out_file = stdout;
4870 if (asm_file_name == 0)
4872 int len = strlen (dump_base_name);
4873 char *dumpname = (char *) xmalloc (len + 6);
4874 memcpy (dumpname, dump_base_name, len + 1);
4875 strip_off_ending (dumpname, len);
4876 strcat (dumpname, ".s");
4877 asm_file_name = dumpname;
4879 if (!strcmp (asm_file_name, "-"))
4880 asm_out_file = stdout;
4882 asm_out_file = fopen (asm_file_name, "w+");
4883 if (asm_out_file == 0)
4884 fatal_io_error ("can't open %s for writing", asm_file_name);
4887 #ifdef IO_BUFFER_SIZE
4888 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4889 _IOFBF, IO_BUFFER_SIZE);
4892 if (!flag_syntax_only)
4894 #ifdef ASM_FILE_START
4895 ASM_FILE_START (asm_out_file);
4898 #ifdef ASM_COMMENT_START
4899 if (flag_verbose_asm)
4901 /* Print the list of options in effect. */
4902 print_version (asm_out_file, ASM_COMMENT_START);
4903 print_switch_values (asm_out_file, 0, MAX_LINE,
4904 ASM_COMMENT_START, " ", "\n");
4905 /* Add a blank line here so it appears in assembler output but not
4907 fprintf (asm_out_file, "\n");
4913 /* Initialization of the front end environment, before command line
4914 options are parsed. Signal handlers, internationalization etc.
4915 ARGV0 is main's argv[0]. */
4917 general_init (argv0)
4922 p = argv0 + strlen (argv0);
4923 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4927 xmalloc_set_program_name (progname);
4931 gcc_init_libintl ();
4933 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4935 signal (SIGSEGV, crash_signal);
4938 signal (SIGILL, crash_signal);
4941 signal (SIGBUS, crash_signal);
4944 signal (SIGABRT, crash_signal);
4946 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4947 signal (SIGIOT, crash_signal);
4950 signal (SIGFPE, crash_signal);
4953 /* Other host-specific signal setup. */
4954 (*host_hooks.extra_signals)();
4956 /* Initialize the diagnostics reporting machinery, so option parsing
4957 can give warnings and errors. */
4958 diagnostic_initialize (global_dc);
4960 /* Initialize the garbage-collector, string pools and tree type hash
4967 /* Parse command line options and set default flag values, called
4968 after language-independent option-independent initialization. Do
4969 minimal options processing. Outputting diagnostics is OK, but GC
4970 and identifier hashtables etc. are not initialized yet.
4972 Return nonzero to suppress compiler back end initialization. */
4974 parse_options_and_default_flags (argc, argv)
4980 /* Save in case md file wants to emit args as a comment. */
4984 /* Initialize register usage now so switches may override. */
4987 /* Register the language-independent parameters. */
4988 add_params (lang_independent_params, LAST_PARAM);
4990 /* This must be done after add_params but before argument processing. */
4991 init_ggc_heuristics();
4993 /* Perform language-specific options initialization. */
4994 (*lang_hooks.init_options) ();
4996 /* Scan to see what optimization level has been specified. That will
4997 determine the default value of many flags. */
4998 for (i = 1; i < argc; i++)
5000 if (!strcmp (argv[i], "-O"))
5005 else if (argv[i][0] == '-' && argv[i][1] == 'O')
5007 /* Handle -Os, -O2, -O3, -O69, ... */
5008 char *p = &argv[i][2];
5010 if ((p[0] == 's') && (p[1] == 0))
5014 /* Optimizing for size forces optimize to be 2. */
5019 const int optimize_val = read_integral_parameter (p, p - 2, -1);
5020 if (optimize_val != -1)
5022 optimize = optimize_val;
5031 flag_merge_constants = 0;
5037 flag_thread_jumps = 1;
5039 flag_delayed_branch = 1;
5041 #ifdef CAN_DEBUG_WITHOUT_FP
5042 flag_omit_frame_pointer = 1;
5044 flag_guess_branch_prob = 1;
5045 flag_cprop_registers = 1;
5046 flag_loop_optimize = 1;
5047 flag_crossjumping = 1;
5048 flag_if_conversion = 1;
5049 flag_if_conversion2 = 1;
5054 flag_optimize_sibling_calls = 1;
5055 flag_cse_follow_jumps = 1;
5056 flag_cse_skip_blocks = 1;
5058 flag_expensive_optimizations = 1;
5059 flag_strength_reduce = 1;
5060 flag_rerun_cse_after_loop = 1;
5061 flag_rerun_loop_opt = 1;
5062 flag_caller_saves = 1;
5065 #ifdef INSN_SCHEDULING
5066 flag_schedule_insns = 1;
5067 flag_schedule_insns_after_reload = 1;
5070 flag_strict_aliasing = 1;
5071 flag_delete_null_pointer_checks = 1;
5072 flag_reorder_blocks = 1;
5073 flag_reorder_functions = 1;
5078 flag_inline_functions = 1;
5079 flag_rename_registers = 1;
5080 flag_unswitch_loops = 1;
5081 flag_unit_at_a_time = 1;
5084 if (optimize < 2 || optimize_size)
5089 align_functions = 1;
5091 /* Don't reorder blocks when optimizing for size because extra
5092 jump insns may be created; also barrier may create extra padding.
5094 More correctly we should have a block reordering mode that tried
5095 to minimize the combined size of all the jumps. This would more
5096 or less automatically remove extra jumps, but would also try to
5097 use more short jumps instead of long jumps. */
5098 flag_reorder_blocks = 0;
5101 /* Initialize whether `char' is signed. */
5102 flag_signed_char = DEFAULT_SIGNED_CHAR;
5103 #ifdef DEFAULT_SHORT_ENUMS
5104 /* Initialize how much space enums occupy, by default. */
5105 flag_short_enums = DEFAULT_SHORT_ENUMS;
5108 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5111 set_target_switch ("");
5113 /* Unwind tables are always present in an ABI-conformant IA-64
5114 object file, so the default should be ON. */
5115 #ifdef IA64_UNWIND_INFO
5116 flag_unwind_tables = IA64_UNWIND_INFO;
5119 #ifdef OPTIMIZATION_OPTIONS
5120 /* Allow default optimizations to be specified on a per-machine basis. */
5121 OPTIMIZATION_OPTIONS (optimize, optimize_size);
5124 /* Perform normal command line switch decoding. */
5125 for (i = 1; i < argc;)
5128 int indep_processed;
5130 /* Give the language a chance to decode the option for itself. */
5131 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
5133 if (lang_processed >= 0)
5134 /* Now see if the option also has a language independent meaning.
5135 Some options are both language specific and language independent,
5137 indep_processed = independent_decode_option (argc - i, argv + i);
5140 lang_processed = -lang_processed;
5141 indep_processed = 0;
5144 if (lang_processed || indep_processed)
5145 i += MAX (lang_processed, indep_processed);
5148 const char *option = NULL;
5149 const char *lang = NULL;
5152 /* It is possible that the command line switch is not valid for the
5153 current language, but it is valid for another language. In order
5154 to be compatible with previous versions of the compiler (which
5155 did not issue an error message in this case) we check for this
5156 possibility here. If we do find a match, then if extra_warnings
5157 is set we generate a warning message, otherwise we will just
5158 ignore the option. */
5159 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5161 option = documented_lang_options[j].option;
5164 lang = documented_lang_options[j].description;
5165 else if (! strncmp (argv[i], option, strlen (option)))
5169 if (j != ARRAY_SIZE (documented_lang_options))
5173 warning ("ignoring command line option '%s'", argv[i]);
5176 ("(it is valid for %s but not the selected language)",
5180 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5181 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5183 error ("unrecognized option `%s'", argv[i]);
5189 if (flag_no_inline == 2)
5192 flag_really_no_inline = flag_no_inline;
5194 /* Set flag_no_inline before the post_options () hook. The C front
5195 ends use it to determine tree inlining defaults. FIXME: such
5196 code should be lang-independent when all front ends use tree
5197 inlining, in which case it, and this condition, should be moved
5198 to the top of process_options() instead. */
5201 /* Inlining does not work if not optimizing,
5202 so force it not to be done. */
5206 /* The c_decode_option function and decode_option hook set
5207 this to `2' if -Wall is used, so we can avoid giving out
5208 lots of errors for people who don't realize what -Wall does. */
5209 if (warn_uninitialized == 1)
5210 warning ("-Wuninitialized is not supported without -O");
5213 if (flag_really_no_inline == 2)
5214 flag_really_no_inline = flag_no_inline;
5217 /* Process the options that have been parsed. */
5221 /* Allow the front end to perform consistency checks and do further
5222 initialization based on the command line options. This hook also
5223 sets the original filename if appropriate (e.g. foo.i -> foo.c)
5224 so we can correctly initialize debug output. */
5225 no_backend = (*lang_hooks.post_options) (&filename);
5226 main_input_filename = input_filename = filename;
5228 #ifdef OVERRIDE_OPTIONS
5229 /* Some machines may reject certain combinations of options. */
5233 /* Set aux_base_name if not already set. */
5238 char *name = xstrdup (lbasename (filename));
5240 strip_off_ending (name, strlen (name));
5241 aux_base_name = name;
5244 aux_base_name = "gccaux";
5246 /* Set up the align_*_log variables, defaulting them to 1 if they
5247 were still unset. */
5248 if (align_loops <= 0) align_loops = 1;
5249 if (align_loops_max_skip > align_loops || !align_loops)
5250 align_loops_max_skip = align_loops - 1;
5251 align_loops_log = floor_log2 (align_loops * 2 - 1);
5252 if (align_jumps <= 0) align_jumps = 1;
5253 if (align_jumps_max_skip > align_jumps || !align_jumps)
5254 align_jumps_max_skip = align_jumps - 1;
5255 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5256 if (align_labels <= 0) align_labels = 1;
5257 align_labels_log = floor_log2 (align_labels * 2 - 1);
5258 if (align_labels_max_skip > align_labels || !align_labels)
5259 align_labels_max_skip = align_labels - 1;
5260 if (align_functions <= 0) align_functions = 1;
5261 align_functions_log = floor_log2 (align_functions * 2 - 1);
5263 /* Unrolling all loops implies that standard loop unrolling must also
5265 if (flag_unroll_all_loops)
5266 flag_unroll_loops = 1;
5268 if (flag_unroll_loops)
5270 flag_old_unroll_loops = 0;
5271 flag_old_unroll_all_loops = 0;
5274 if (flag_old_unroll_all_loops)
5275 flag_old_unroll_loops = 1;
5277 /* Old loop unrolling requires that strength_reduction be on also. Silently
5278 turn on strength reduction here if it isn't already on. Also, the loop
5279 unrolling code assumes that cse will be run after loop, so that must
5280 be turned on also. */
5281 if (flag_old_unroll_loops)
5283 flag_strength_reduce = 1;
5284 flag_rerun_cse_after_loop = 1;
5286 if (flag_unroll_loops || flag_peel_loops)
5287 flag_rerun_cse_after_loop = 1;
5289 if (flag_non_call_exceptions)
5290 flag_asynchronous_unwind_tables = 1;
5291 if (flag_asynchronous_unwind_tables)
5292 flag_unwind_tables = 1;
5294 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5296 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
5297 flag_unit_at_a_time = 0;
5299 /* Warn about options that are not supported on this machine. */
5300 #ifndef INSN_SCHEDULING
5301 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5302 warning ("instruction scheduling not supported on this target machine");
5305 if (flag_delayed_branch)
5306 warning ("this target machine does not have delayed branches");
5309 user_label_prefix = USER_LABEL_PREFIX;
5310 if (flag_leading_underscore != -1)
5312 /* If the default prefix is more complicated than "" or "_",
5313 issue a warning and ignore this option. */
5314 if (user_label_prefix[0] == 0 ||
5315 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5317 user_label_prefix = flag_leading_underscore ? "_" : "";
5320 warning ("-f%sleading-underscore not supported on this target machine",
5321 flag_leading_underscore ? "" : "no-");
5324 /* If we are in verbose mode, write out the version and maybe all the
5325 option flags in use. */
5328 print_version (stderr, "");
5330 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5333 if (flag_syntax_only)
5335 write_symbols = NO_DEBUG;
5339 /* Now we know write_symbols, set up the debug hooks based on it.
5340 By default we do nothing for debug output. */
5341 #if defined(DBX_DEBUGGING_INFO)
5342 if (write_symbols == DBX_DEBUG)
5343 debug_hooks = &dbx_debug_hooks;
5345 #if defined(XCOFF_DEBUGGING_INFO)
5346 if (write_symbols == XCOFF_DEBUG)
5347 debug_hooks = &xcoff_debug_hooks;
5349 #ifdef SDB_DEBUGGING_INFO
5350 if (write_symbols == SDB_DEBUG)
5351 debug_hooks = &sdb_debug_hooks;
5353 #ifdef DWARF_DEBUGGING_INFO
5354 if (write_symbols == DWARF_DEBUG)
5355 debug_hooks = &dwarf_debug_hooks;
5357 #ifdef DWARF2_DEBUGGING_INFO
5358 if (write_symbols == DWARF2_DEBUG)
5359 debug_hooks = &dwarf2_debug_hooks;
5361 #ifdef VMS_DEBUGGING_INFO
5362 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5363 debug_hooks = &vmsdbg_debug_hooks;
5366 /* If auxiliary info generation is desired, open the output file.
5367 This goes in the same directory as the source file--unlike
5368 all the other output files. */
5369 if (flag_gen_aux_info)
5371 aux_info_file = fopen (aux_info_file_name, "w");
5372 if (aux_info_file == 0)
5373 fatal_io_error ("can't open %s", aux_info_file_name);
5376 if (! targetm.have_named_sections)
5378 if (flag_function_sections)
5380 warning ("-ffunction-sections not supported for this target");
5381 flag_function_sections = 0;
5383 if (flag_data_sections)
5385 warning ("-fdata-sections not supported for this target");
5386 flag_data_sections = 0;
5390 if (flag_function_sections && profile_flag)
5392 warning ("-ffunction-sections disabled; it makes profiling impossible");
5393 flag_function_sections = 0;
5396 #ifndef HAVE_prefetch
5397 if (flag_prefetch_loop_arrays)
5399 warning ("-fprefetch-loop-arrays not supported for this target");
5400 flag_prefetch_loop_arrays = 0;
5403 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5405 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5406 flag_prefetch_loop_arrays = 0;
5410 /* This combination of options isn't handled for i386 targets and doesn't
5411 make much sense anyway, so don't allow it. */
5412 if (flag_prefetch_loop_arrays && optimize_size)
5414 warning ("-fprefetch-loop-arrays is not supported with -Os");
5415 flag_prefetch_loop_arrays = 0;
5418 #ifndef OBJECT_FORMAT_ELF
5419 if (flag_function_sections && write_symbols != NO_DEBUG)
5420 warning ("-ffunction-sections may affect debugging on some targets");
5423 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5424 if (flag_signaling_nans)
5425 flag_trapping_math = 1;
5428 /* Initialize the compiler back end. */
5432 /* init_emit_once uses reg_raw_mode and therefore must be called
5433 after init_regs which initialized reg_raw_mode. */
5435 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5436 || debug_info_level == DINFO_LEVEL_VERBOSE
5437 #ifdef VMS_DEBUGGING_INFO
5438 /* Enable line number info for traceback */
5439 || debug_info_level > DINFO_LEVEL_NONE
5441 || flag_test_coverage
5442 || warn_notreached);
5443 init_fake_stack_mems ();
5447 init_function_once ();
5448 init_varasm_once ();
5450 /* The following initialization functions need to generate rtl, so
5451 provide a dummy function context for them. */
5452 init_dummy_function_start ();
5454 if (flag_caller_saves)
5455 init_caller_save ();
5456 expand_dummy_function_end ();
5459 /* Language-dependent initialization. Returns nonzero on success. */
5461 lang_dependent_init (name)
5464 if (dump_base_name == 0)
5465 dump_base_name = name ? name : "gccdump";
5467 /* Other front-end initialization. */
5468 if ((*lang_hooks.init) () == 0)
5471 init_asm_output (name);
5473 /* These create various _DECL nodes, so need to be called after the
5474 front end is initialized. */
5478 /* The following initialization functions need to generate rtl, so
5479 provide a dummy function context for them. */
5480 init_dummy_function_start ();
5482 expand_dummy_function_end ();
5484 /* Put an entry on the input file stack for the main input file. */
5485 push_srcloc (input_filename, 0);
5487 /* If dbx symbol table desired, initialize writing it and output the
5488 predefined types. */
5489 timevar_push (TV_SYMOUT);
5491 #ifdef DWARF2_UNWIND_INFO
5492 if (dwarf2out_do_frame ())
5493 dwarf2out_frame_init ();
5496 /* Now we have the correct original filename, we can initialize
5498 (*debug_hooks->init) (name);
5500 timevar_pop (TV_SYMOUT);
5505 /* Clean up: close opened files, etc. */
5510 /* Close the dump files. */
5511 if (flag_gen_aux_info)
5513 fclose (aux_info_file);
5515 unlink (aux_info_file_name);
5518 /* Close non-debugging input and output files. Take special care to note
5519 whether fclose returns an error, since the pages might still be on the
5520 buffer chain while the file is open. */
5524 if (ferror (asm_out_file) != 0)
5525 fatal_io_error ("error writing to %s", asm_file_name);
5526 if (fclose (asm_out_file) != 0)
5527 fatal_io_error ("error closing %s", asm_file_name);
5530 /* Do whatever is necessary to finish printing the graphs. */
5531 if (graph_dump_format != no_graph)
5535 for (i = 0; i < (int) DFI_MAX; ++i)
5536 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5541 sprintf (seq, DUMPFILE_FORMAT, i);
5542 suffix = concat (seq, dump_file[i].extension, NULL);
5543 finish_graph_dump_file (dump_base_name, suffix);
5550 ggc_print_statistics ();
5551 stringpool_statistics ();
5552 dump_tree_statistics ();
5555 /* Free up memory for the benefit of leak detectors. */
5558 /* Language-specific end of compilation actions. */
5559 (*lang_hooks.finish) ();
5562 /* Initialize the compiler, and compile the input file. */
5566 /* Initialize timing first. The C front ends read the main file in
5567 the post_options hook, and C++ does file timings. */
5568 if (time_report || !quiet_flag || flag_detailed_statistics)
5570 timevar_start (TV_TOTAL);
5574 /* Don't do any more if an error has already occurred. */
5577 /* Set up the back-end if requested. */
5581 /* Language-dependent initialization. Returns true on success. */
5582 if (lang_dependent_init (filename))
5588 /* Stop timing and print the times. */
5589 timevar_stop (TV_TOTAL);
5590 timevar_print (stderr);
5593 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5594 Decode command args, then call compile_file.
5595 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5596 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5598 It is not safe to call this function more than once. */
5601 toplev_main (argc, argv)
5605 /* Initialization of GCC's environment, and diagnostics. */
5606 general_init (argv[0]);
5608 /* Parse the options and do minimal processing; basically just
5609 enough to default flags appropriately. */
5610 parse_options_and_default_flags (argc, argv);
5612 /* Exit early if we can (e.g. -help). */
5613 if (!exit_after_options)
5616 if (errorcount || sorrycount)
5617 return (FATAL_EXIT_CODE);
5619 return (SUCCESS_EXIT_CODE);