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
24 /* This is the top level of cc1/c++.
25 It parses command args, opens files, invokes the various passes
26 in the proper order, and counts the time used by each.
27 Error messages and low-level interface to malloc also handled here. */
30 #undef FLOAT /* This is for hpux. They should change hpux. */
31 #undef FFS /* Some systems define this in param.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 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
78 #include "dwarf2out.h"
81 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
85 #ifdef SDB_DEBUGGING_INFO
89 #ifdef XCOFF_DEBUGGING_INFO
90 #include "xcoffout.h" /* Needed for external data
91 declarations for e.g. AIX 4.x. */
94 /* Carry information from ASM_DECLARE_OBJECT_NAME
95 to ASM_FINISH_DECLARE_OBJECT. */
97 extern int size_directive_output;
98 extern tree last_assemble_variable_decl;
100 extern void reg_alloc PARAMS ((void));
102 static void general_init PARAMS ((char *));
103 static void parse_options_and_default_flags PARAMS ((int, char **));
104 static void do_compile PARAMS ((void));
105 static void process_options PARAMS ((void));
106 static void backend_init PARAMS ((void));
107 static int lang_dependent_init PARAMS ((const char *));
108 static void init_asm_output PARAMS ((const char *));
109 static void finalize PARAMS ((void));
111 static void set_target_switch PARAMS ((const char *));
113 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
114 static void compile_file PARAMS ((void));
115 static void display_help PARAMS ((void));
116 static void display_target_options PARAMS ((void));
118 static void decode_d_option PARAMS ((const char *));
119 static int decode_f_option PARAMS ((const char *));
120 static int decode_W_option PARAMS ((const char *));
121 static int decode_g_option PARAMS ((const char *));
122 static unsigned int independent_decode_option PARAMS ((int, char **));
124 static void print_version PARAMS ((FILE *, const char *));
125 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
126 const char *, const char *,
127 const char *, const char *));
128 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
129 const char *, const char *));
131 /* Nonzero to dump debug info whilst parsing (-dy option). */
132 static int set_yydebug;
134 /* Length of line when printing switch values. */
137 /* Name of program invoked, sans directories. */
139 const char *progname;
141 /* Copy of arguments to toplev_main. */
145 /* Name of current original source file (what was input to cpp).
146 This comes from each #-command in the actual input. */
148 const char *input_filename;
150 /* Name of top-level original source file (what was input to cpp).
151 This comes from the #-command at the beginning of the actual input.
152 If there isn't any there, then this is the cc1 input file name. */
154 const char *main_input_filename;
156 /* Current line number in real source file. */
160 /* Nonzero if it is unsafe to create any new pseudo registers. */
163 /* Stack of currently pending input files. */
165 struct file_stack *input_file_stack;
167 /* Incremented on each change to input_file_stack. */
168 int input_file_stack_tick;
170 /* Name to use as base of names for dump output files. */
172 const char *dump_base_name;
174 /* Name to use as a base for auxiliary output files. */
176 const char *aux_base_name;
178 /* Format to use to print dumpfile index value */
179 #ifndef DUMPFILE_FORMAT
180 #define DUMPFILE_FORMAT ".%02d."
183 /* Bit flags that specify the machine subtype we are compiling for.
184 Bits are tested using macros TARGET_... defined in the tm.h file
185 and set by `-m...' switches. Must be defined in rtlanal.c. */
187 extern int target_flags;
189 /* A mask of target_flags that includes bit X if X was set or cleared
190 on the command line. */
192 int target_flags_explicit;
194 /* Debug hooks - dependent upon command line options. */
196 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
198 /* Describes a dump file. */
200 struct dump_file_info
202 /* The unique extension to apply, e.g. ".jump". */
203 const char *const extension;
205 /* The -d<c> character that enables this dump file. */
206 char const debug_switch;
208 /* True if there is a corresponding graph dump file. */
209 char const graph_dump_p;
211 /* True if the user selected this dump. */
214 /* True if the files have been initialized (ie truncated). */
218 /* Enumerate the extant dump files. */
260 /* Describes all the dump files. Should be kept in order of the
261 pass and in sync with dump_file_index above.
263 Remaining -d letters:
269 static struct dump_file_info dump_file[DFI_MAX] =
271 { "rtl", 'r', 0, 0, 0 },
272 { "sibling", 'i', 0, 0, 0 },
273 { "eh", 'h', 0, 0, 0 },
274 { "jump", 'j', 0, 0, 0 },
275 { "ssa", 'e', 1, 0, 0 },
276 { "ssaccp", 'W', 1, 0, 0 },
277 { "ssadce", 'X', 1, 0, 0 },
278 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
279 { "null", 'u', 0, 0, 0 },
280 { "cse", 's', 0, 0, 0 },
281 { "addressof", 'F', 0, 0, 0 },
282 { "gcse", 'G', 1, 0, 0 },
283 { "loop", 'L', 1, 0, 0 },
284 { "cfg", 'f', 1, 0, 0 },
285 { "bp", 'b', 1, 0, 0 },
286 { "ce1", 'C', 1, 0, 0 },
287 { "tracer", 'T', 1, 0, 0 },
288 { "cse2", 't', 1, 0, 0 },
289 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
290 { "combine", 'c', 1, 0, 0 },
291 { "ce2", 'C', 1, 0, 0 },
292 { "regmove", 'N', 1, 0, 0 },
293 { "sched", 'S', 1, 0, 0 },
294 { "lreg", 'l', 1, 0, 0 },
295 { "greg", 'g', 1, 0, 0 },
296 { "postreload", 'o', 1, 0, 0 },
297 { "flow2", 'w', 1, 0, 0 },
298 { "peephole2", 'z', 1, 0, 0 },
299 { "rnreg", 'n', 1, 0, 0 },
300 { "ce3", 'E', 1, 0, 0 },
301 { "sched2", 'R', 1, 0, 0 },
302 { "stack", 'k', 1, 0, 0 },
303 { "bbro", 'B', 1, 0, 0 },
304 { "mach", 'M', 1, 0, 0 },
305 { "dbr", 'd', 0, 0, 0 },
308 static int open_dump_file PARAMS ((enum dump_file_index, tree));
309 static void close_dump_file PARAMS ((enum dump_file_index,
310 void (*) (FILE *, rtx), rtx));
312 /* Other flags saying which kinds of debugging dump have been requested. */
314 int rtl_dump_and_exit;
315 int flag_print_asm_name;
316 static int version_flag;
317 static char *filename;
318 enum graph_dump_types graph_dump_format;
320 /* Name for output file of assembly code, specified with -o. */
324 /* Value of the -G xx switch, and whether it was passed or not. */
328 /* Type(s) of debugging information we are producing (if any).
329 See flags.h for the definitions of the different possible
330 types of debugging information. */
331 enum debug_info_type write_symbols = NO_DEBUG;
333 /* Level of debugging information we are producing. See flags.h
334 for the definitions of the different possible levels. */
335 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
337 /* Nonzero means use GNU-only extensions in the generated symbolic
338 debugging information. */
339 /* Currently, this only has an effect when write_symbols is set to
340 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
341 int use_gnu_debug_info_extensions = 0;
343 /* Nonzero means do optimizations. -O.
344 Particular numeric values stand for particular amounts of optimization;
345 thus, -O2 stores 2 here. However, the optimizations beyond the basic
346 ones are not controlled directly by this variable. Instead, they are
347 controlled by individual `flag_...' variables that are defaulted
348 based on this variable. */
352 /* Nonzero means optimize for size. -Os.
353 The only valid values are zero and nonzero. When optimize_size is
354 nonzero, optimize defaults to 2, but certain individual code
355 bloating optimizations are disabled. */
357 int optimize_size = 0;
359 /* Nonzero if we should exit after parsing options. */
360 static int exit_after_options = 0;
362 /* The FUNCTION_DECL for the function currently being compiled,
363 or 0 if between functions. */
364 tree current_function_decl;
366 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
368 tree current_function_func_begin_label;
370 /* Nonzero if doing dwarf2 duplicate elimination. */
372 int flag_eliminate_dwarf2_dups = 0;
374 /* Nonzero if generating code to do profiling. */
376 int profile_flag = 0;
378 /* Nonzero if generating code to profile program flow graph arcs. */
380 int profile_arc_flag = 0;
382 /* Nonzero if generating info for gcov to calculate line test coverage. */
384 int flag_test_coverage = 0;
386 /* Nonzero indicates that branch taken probabilities should be calculated. */
388 int flag_branch_probabilities = 0;
390 /* Nonzero if basic blocks should be reordered. */
392 int flag_reorder_blocks = 0;
394 /* Nonzero if functions should be reordered. */
396 int flag_reorder_functions = 0;
398 /* Nonzero if registers should be renamed. */
400 int flag_rename_registers = 0;
401 int flag_cprop_registers = 0;
403 /* Nonzero for -pedantic switch: warn about anything
404 that standard spec forbids. */
408 /* Temporarily suppress certain warnings.
409 This is set while reading code from a system header file. */
411 int in_system_header = 0;
413 /* Don't print functions as they are compiled. -quiet. */
417 /* Print times taken by the various passes. -ftime-report. */
421 /* Print memory still in use at end of compilation (which may have little
422 to do with peak memory consumption). -fmem-report. */
426 /* Non-zero means to collect statistics which might be expensive
427 and to print them when we are done. */
428 int flag_detailed_statistics = 0;
433 /* Nonzero means `char' should be signed. */
435 int flag_signed_char;
437 /* Nonzero means give an enum type only as many bytes as it needs. */
439 int flag_short_enums;
441 /* Nonzero for -fcaller-saves: allocate values in regs that need to
442 be saved across function calls, if that produces overall better code.
443 Optional now, so people can test it. */
445 #ifdef DEFAULT_CALLER_SAVES
446 int flag_caller_saves = 1;
448 int flag_caller_saves = 0;
451 /* Nonzero if structures and unions should be returned in memory.
453 This should only be defined if compatibility with another compiler or
454 with an ABI is needed, because it results in slower code. */
456 #ifndef DEFAULT_PCC_STRUCT_RETURN
457 #define DEFAULT_PCC_STRUCT_RETURN 1
460 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
462 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
464 /* Nonzero for -fforce-mem: load memory value into a register
465 before arithmetic on it. This makes better cse but slower compilation. */
467 int flag_force_mem = 0;
469 /* Nonzero for -fforce-addr: load memory address into a register before
470 reference to memory. This makes better cse but slower compilation. */
472 int flag_force_addr = 0;
474 /* Nonzero for -fdefer-pop: don't pop args after each function call;
475 instead save them up to pop many calls' args with one insns. */
477 int flag_defer_pop = 0;
479 /* Nonzero for -ffloat-store: don't allocate floats and doubles
480 in extended-precision registers. */
482 int flag_float_store = 0;
484 /* Nonzero for -fcse-follow-jumps:
485 have cse follow jumps to do a more extensive job. */
487 int flag_cse_follow_jumps;
489 /* Nonzero for -fcse-skip-blocks:
490 have cse follow a branch around a block. */
491 int flag_cse_skip_blocks;
493 /* Nonzero for -fexpensive-optimizations:
494 perform miscellaneous relatively-expensive optimizations. */
495 int flag_expensive_optimizations;
497 /* Nonzero for -fthread-jumps:
498 have jump optimize output of loop. */
500 int flag_thread_jumps;
502 /* Nonzero enables strength-reduction in loop.c. */
504 int flag_strength_reduce = 0;
506 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
507 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
508 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
511 int flag_unroll_loops;
513 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
514 This is generally not a win. */
516 int flag_unroll_all_loops;
518 /* Nonzero enables prefetch optimizations for arrays in loops. */
520 int flag_prefetch_loop_arrays;
522 /* Nonzero forces all invariant computations in loops to be moved
525 int flag_move_all_movables = 0;
527 /* Nonzero forces all general induction variables in loops to be
530 int flag_reduce_all_givs = 0;
532 /* Nonzero to perform full register move optimization passes. This is the
535 int flag_regmove = 0;
537 /* Nonzero for -fwritable-strings:
538 store string constants in data segment and don't uniquize them. */
540 int flag_writable_strings = 0;
542 /* Nonzero means don't put addresses of constant functions in registers.
543 Used for compiling the Unix kernel, where strange substitutions are
544 done on the assembly output. */
546 int flag_no_function_cse = 0;
548 /* Nonzero for -fomit-frame-pointer:
549 don't make a frame pointer in simple functions that don't require one. */
551 int flag_omit_frame_pointer = 0;
553 /* Nonzero means place each function into its own section on those platforms
554 which support arbitrary section names and unlimited numbers of sections. */
556 int flag_function_sections = 0;
558 /* ... and similar for data. */
560 int flag_data_sections = 0;
562 /* Nonzero to inhibit use of define_optimization peephole opts. */
564 int flag_no_peephole = 0;
566 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
568 int flag_optimize_sibling_calls = 0;
570 /* Nonzero means the front end generally wants `errno' maintained by math
571 operations, like built-in SQRT. */
573 int flag_errno_math = 1;
575 /* Nonzero means that unsafe floating-point math optimizations are allowed
576 for the sake of speed. IEEE compliance is not guaranteed, and operations
577 are allowed to assume that their arguments and results are "normal"
578 (e.g., nonnegative for SQRT). */
580 int flag_unsafe_math_optimizations = 0;
582 /* Nonzero means that no NaNs or +-Infs are expected. */
584 int flag_finite_math_only = 0;
586 /* Zero means that floating-point math operations cannot generate a
587 (user-visible) trap. This is the case, for example, in nonstop
588 IEEE 754 arithmetic. Trapping conditions include division by zero,
589 overflow, underflow, invalid and inexact, but does not include
590 operations on signaling NaNs (see below). */
592 int flag_trapping_math = 1;
594 /* Nonzero means disable transformations observable by signaling NaNs.
595 This option implies that any operation on a IEEE signaling NaN can
596 generate a (user-visible) trap. */
598 int flag_signaling_nans = 0;
600 /* 0 means straightforward implementation of complex divide acceptable.
601 1 means wide ranges of inputs must work for complex divide.
602 2 means C99-like requirements for complex divide (not yet implemented). */
604 int flag_complex_divide_method = 0;
606 /* Nonzero means all references through pointers are volatile. */
610 /* Nonzero means treat all global and extern variables as volatile. */
612 int flag_volatile_global;
614 /* Nonzero means treat all static variables as volatile. */
616 int flag_volatile_static;
618 /* Nonzero means just do syntax checking; don't output anything. */
620 int flag_syntax_only = 0;
622 /* Nonzero means perform global cse. */
624 static int flag_gcse;
626 /* Nonzero means perform loop optimizer. */
628 static int flag_loop_optimize;
630 /* Nonzero means perform crossjumping. */
632 static int flag_crossjumping;
634 /* Nonzero means perform if conversion. */
636 static int flag_if_conversion;
638 /* Nonzero means perform if conversion after reload. */
640 static int flag_if_conversion2;
642 /* Nonzero means to use global dataflow analysis to eliminate
643 useless null pointer tests. */
645 static int flag_delete_null_pointer_checks;
647 /* Nonzero means to do the enhanced load motion during gcse, which trys
648 to hoist loads by not killing them when a store to the same location
651 int flag_gcse_lm = 1;
653 /* Nonzero means to perform store motion after gcse, which will try to
654 move stores closer to the exit block. Its not very effective without
657 int flag_gcse_sm = 1;
659 /* Nonzero means to rerun cse after loop optimization. This increases
660 compilation time about 20% and picks up a few more common expressions. */
662 static int flag_rerun_cse_after_loop;
664 /* Nonzero means to run loop optimizations twice. */
666 int flag_rerun_loop_opt;
668 /* Nonzero for -finline-functions: ok to inline functions that look like
669 good inline candidates. */
671 int flag_inline_functions;
673 /* Nonzero for -fkeep-inline-functions: even if we make a function
674 go inline everywhere, keep its definition around for debugging
677 int flag_keep_inline_functions;
679 /* Nonzero means that functions will not be inlined. */
681 int flag_no_inline = 2;
683 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
684 not just because the tree inliner turned us off. */
686 int flag_really_no_inline = 2;
688 /* Nonzero means that we should emit static const variables
689 regardless of whether or not optimization is turned on. */
691 int flag_keep_static_consts = 1;
693 /* Nonzero means we should be saving declaration info into a .X file. */
695 int flag_gen_aux_info = 0;
697 /* Specified name of aux-info file. */
699 static char *aux_info_file_name;
701 /* Nonzero means make the text shared if supported. */
703 int flag_shared_data;
705 /* Nonzero means schedule into delayed branch slots if supported. */
707 int flag_delayed_branch;
709 /* Nonzero if we are compiling pure (sharable) code.
710 Value is 1 if we are doing "small" pic; value is 2 if we're doing
715 /* Set to the default thread-local storage (tls) model to use. */
717 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
719 /* Nonzero means generate extra code for exception handling and enable
720 exception handling. */
724 /* Nonzero means generate frame unwind info table when supported. */
726 int flag_unwind_tables = 0;
728 /* Nonzero means generate frame unwind info table exact at each insn boundary */
730 int flag_asynchronous_unwind_tables = 0;
732 /* Nonzero means don't place uninitialized global data in common storage
737 /* Nonzero means change certain warnings into errors.
738 Usually these are warnings about failure to conform to some standard. */
740 int flag_pedantic_errors = 0;
742 /* flag_schedule_insns means schedule insns within basic blocks (before
744 flag_schedule_insns_after_reload means schedule insns after
747 int flag_schedule_insns = 0;
748 int flag_schedule_insns_after_reload = 0;
750 /* The following flags have effect only for scheduling before register
753 flag_schedule_interblock means schedule insns accross basic blocks.
754 flag_schedule_speculative means allow speculative motion of non-load insns.
755 flag_schedule_speculative_load means allow speculative motion of some
757 flag_schedule_speculative_load_dangerous allows speculative motion of more
760 int flag_schedule_interblock = 1;
761 int flag_schedule_speculative = 1;
762 int flag_schedule_speculative_load = 0;
763 int flag_schedule_speculative_load_dangerous = 0;
765 int flag_single_precision_constant;
767 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
768 by a cheaper branch on a count register. */
769 int flag_branch_on_count_reg = 1;
771 /* -finhibit-size-directive inhibits output of .size for ELF.
772 This is used only for compiling crtstuff.c,
773 and it may be extended to other effects
774 needed for crtstuff.c on other systems. */
775 int flag_inhibit_size_directive = 0;
777 /* -fverbose-asm causes extra commentary information to be produced in
778 the generated assembly code (to make it more readable). This option
779 is generally only of use to those who actually need to read the
780 generated assembly code (perhaps while debugging the compiler itself).
781 -fno-verbose-asm, the default, causes the extra information
782 to be omitted and is useful when comparing two assembler files. */
784 int flag_verbose_asm = 0;
786 /* -dA causes debug commentary information to be produced in
787 the generated assembly code (to make it more readable). This option
788 is generally only of use to those who actually need to read the
789 generated assembly code (perhaps while debugging the compiler itself).
790 Currently, this switch is only used by dwarfout.c; however, it is intended
791 to be a catchall for printing debug information in the assembler file. */
793 int flag_debug_asm = 0;
795 /* -dP causes the rtl to be emitted as a comment in assembly. */
797 int flag_dump_rtl_in_asm = 0;
799 /* -fgnu-linker specifies use of the GNU linker for initializations.
800 (Or, more generally, a linker that handles initializations.)
801 -fno-gnu-linker says that collect2 will be used. */
803 int flag_gnu_linker = 0;
805 int flag_gnu_linker = 1;
808 /* Nonzero means put zero initialized data in the bss section. */
809 int flag_zero_initialized_in_bss = 1;
814 /* Enable ssa conditional constant propagation. */
815 int flag_ssa_ccp = 0;
817 /* Enable ssa aggressive dead code elimination. */
818 int flag_ssa_dce = 0;
820 /* Tag all structures with __attribute__(packed). */
821 int flag_pack_struct = 0;
823 /* Nonzero means that -Wformat accepts certain system-dependent formats. */
824 int flag_format_extensions = 0;
826 /* Emit code to check for stack overflow; also may cause large objects
827 to be allocated dynamically. */
828 int flag_stack_check;
830 /* When non-NULL, indicates that whenever space is allocated on the
831 stack, the resulting stack pointer must not pass this
832 address---that is, for stacks that grow downward, the stack pointer
833 must always be greater than or equal to this address; for stacks
834 that grow upward, the stack pointer must be less than this address.
835 At present, the rtx may be either a REG or a SYMBOL_REF, although
836 the support provided depends on the backend. */
839 /* 0 if pointer arguments may alias each other. True in C.
840 1 if pointer arguments may not alias each other but may alias
842 2 if pointer arguments may not alias each other and may not
843 alias global variables. True in Fortran.
844 This defaults to 0 for C. */
845 int flag_argument_noalias = 0;
847 /* Nonzero if we should do (language-dependent) alias analysis.
848 Typically, this analysis will assume that expressions of certain
849 types do not alias expressions of certain other types. Only used
850 if alias analysis (in general) is enabled. */
851 int flag_strict_aliasing = 0;
853 /* Instrument functions with calls at entry and exit, for profiling. */
854 int flag_instrument_function_entry_exit = 0;
856 /* Nonzero means ignore `#ident' directives. 0 means handle them.
857 On SVR4 targets, it also controls whether or not to emit a
858 string identifying the compiler. */
860 int flag_no_ident = 0;
862 /* This will perform a peephole pass before sched2. */
863 int flag_peephole2 = 0;
865 /* This will try to guess branch probabilities. */
866 int flag_guess_branch_prob = 0;
868 /* -fcheck-bounds causes gcc to generate array bounds checks.
869 For C, C++, ObjC: defaults to off.
870 For Java: defaults to on.
871 For Fortran: defaults to off. */
872 int flag_bounds_check = 0;
874 /* This will attempt to merge constant section constants, if 1 only
875 string constants and constants from constant pool, if 2 also constant
877 int flag_merge_constants = 1;
879 /* If one, renumber instruction UIDs to reduce the number of
880 unused UIDs if there are a lot of instructions. If greater than
881 one, unconditionally renumber instruction UIDs. */
882 int flag_renumber_insns = 1;
884 /* If nonzero, use the graph coloring register allocator. */
885 int flag_new_regalloc = 0;
887 /* Nonzero if we perform superblock formation. */
891 /* Values of the -falign-* flags: how much to align labels in code.
892 0 means `use default', 1 means `don't align'.
893 For each variable, there is an _log variant which is the power
894 of two not less than the variable, for .align output. */
898 int align_loops_max_skip;
901 int align_jumps_max_skip;
903 int align_labels_log;
904 int align_labels_max_skip;
906 int align_functions_log;
908 /* Like align_functions_log above, but used by front-ends to force the
909 minimum function alignment. Zero means no alignment is forced. */
910 int force_align_functions_log;
912 /* Table of supported debugging formats. */
915 const char *const arg;
916 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
917 constant expression, we use NO_DEBUG in its place. */
918 const enum debug_info_type debug_type;
919 const int use_extensions_p;
920 const char *const description;
924 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
925 N_("Generate debugging info in default format") },
926 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
927 #ifdef DBX_DEBUGGING_INFO
928 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
929 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
931 #ifdef DWARF_DEBUGGING_INFO
932 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
933 { "dwarf+", DWARF_DEBUG, 1,
934 N_("Generate extended DWARF-1 format debug info") },
936 #ifdef DWARF2_DEBUGGING_INFO
937 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
939 #ifdef XCOFF_DEBUGGING_INFO
940 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
941 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
943 #ifdef SDB_DEBUGGING_INFO
944 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
946 #ifdef VMS_DEBUGGING_INFO
947 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
954 const char *const string;
957 const char *const description;
959 lang_independent_options;
963 /* Add or remove a leading underscore from user symbols. */
964 int flag_leading_underscore = -1;
966 /* The user symbol prefix after having resolved same. */
967 const char *user_label_prefix;
969 static const param_info lang_independent_params[] = {
970 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
971 { OPTION, DEFAULT, HELP },
972 #include "params.def"
977 /* Table of language-independent -f options.
978 STRING is the option name. VARIABLE is the address of the variable.
979 ON_VALUE is the value to store in VARIABLE
980 if `-fSTRING' is seen as an option.
981 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
983 static const lang_independent_options f_options[] =
985 {"format-extensions", &flag_format_extensions, 1,
986 N_("-Wformat accepts certain FreeBSD system-dependent formats") },
987 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
988 N_("Perform DWARF2 duplicate elimination") },
989 {"float-store", &flag_float_store, 1,
990 N_("Do not store floats in registers") },
991 {"volatile", &flag_volatile, 1,
992 N_("Consider all mem refs through pointers as volatile") },
993 {"volatile-global", &flag_volatile_global, 1,
994 N_("Consider all mem refs to global data to be volatile") },
995 {"volatile-static", &flag_volatile_static, 1,
996 N_("Consider all mem refs to static data to be volatile") },
997 {"defer-pop", &flag_defer_pop, 1,
998 N_("Defer popping functions args from stack until later") },
999 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1000 N_("When possible do not generate stack frames") },
1001 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1002 N_("Optimize sibling and tail recursive calls") },
1003 {"tracer", &flag_tracer, 1,
1004 N_("Perform superblock formation via tail duplication") },
1005 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1006 N_("When running CSE, follow jumps to their targets") },
1007 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1008 N_("When running CSE, follow conditional jumps") },
1009 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1010 N_("Perform a number of minor, expensive optimizations") },
1011 {"thread-jumps", &flag_thread_jumps, 1,
1012 N_("Perform jump threading optimizations") },
1013 {"strength-reduce", &flag_strength_reduce, 1,
1014 N_("Perform strength reduction optimizations") },
1015 {"unroll-loops", &flag_unroll_loops, 1,
1016 N_("Perform loop unrolling when iteration count is known") },
1017 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1018 N_("Perform loop unrolling for all loops") },
1019 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1020 N_("Generate prefetch instructions, if available, for arrays in loops") },
1021 {"move-all-movables", &flag_move_all_movables, 1,
1022 N_("Force all loop invariant computations out of loops") },
1023 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1024 N_("Strength reduce all loop general induction variables") },
1025 {"writable-strings", &flag_writable_strings, 1,
1026 N_("Store strings in writable data section") },
1027 {"peephole", &flag_no_peephole, 0,
1028 N_("Enable machine specific peephole optimizations") },
1029 {"force-mem", &flag_force_mem, 1,
1030 N_("Copy memory operands into registers before using") },
1031 {"force-addr", &flag_force_addr, 1,
1032 N_("Copy memory address constants into regs before using") },
1033 {"function-cse", &flag_no_function_cse, 0,
1034 N_("Allow function addresses to be held in registers") },
1035 {"inline-functions", &flag_inline_functions, 1,
1036 N_("Integrate simple functions into their callers") },
1037 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1038 N_("Generate code for funcs even if they are fully inlined") },
1039 {"inline", &flag_no_inline, 0,
1040 N_("Pay attention to the 'inline' keyword") },
1041 {"keep-static-consts", &flag_keep_static_consts, 1,
1042 N_("Emit static const variables even if they are not used") },
1043 {"syntax-only", &flag_syntax_only, 1,
1044 N_("Check for syntax errors, then stop") },
1045 {"shared-data", &flag_shared_data, 1,
1046 N_("Mark data as shared rather than private") },
1047 {"caller-saves", &flag_caller_saves, 1,
1048 N_("Enable saving registers around function calls") },
1049 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1050 N_("Return 'short' aggregates in memory, not registers") },
1051 {"reg-struct-return", &flag_pcc_struct_return, 0,
1052 N_("Return 'short' aggregates in registers") },
1053 {"delayed-branch", &flag_delayed_branch, 1,
1054 N_("Attempt to fill delay slots of branch instructions") },
1055 {"gcse", &flag_gcse, 1,
1056 N_("Perform the global common subexpression elimination") },
1057 {"gcse-lm", &flag_gcse_lm, 1,
1058 N_("Perform enhanced load motion during global subexpression elimination") },
1059 {"gcse-sm", &flag_gcse_sm, 1,
1060 N_("Perform store motion after global subexpression elimination") },
1061 {"loop-optimize", &flag_loop_optimize, 1,
1062 N_("Perform the loop optimizations") },
1063 {"crossjumping", &flag_crossjumping, 1,
1064 N_("Perform cross-jumping optimization") },
1065 {"if-conversion", &flag_if_conversion, 1,
1066 N_("Perform conversion of conditional jumps to branchless equivalents") },
1067 {"if-conversion2", &flag_if_conversion2, 1,
1068 N_("Perform conversion of conditional jumps to conditional execution") },
1069 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1070 N_("Run CSE pass after loop optimizations") },
1071 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1072 N_("Run the loop optimizer twice") },
1073 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1074 N_("Delete useless null pointer checks") },
1075 {"schedule-insns", &flag_schedule_insns, 1,
1076 N_("Reschedule instructions before register allocation") },
1077 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1078 N_("Reschedule instructions after register allocation") },
1079 {"sched-interblock",&flag_schedule_interblock, 1,
1080 N_("Enable scheduling across basic blocks") },
1081 {"sched-spec",&flag_schedule_speculative, 1,
1082 N_("Allow speculative motion of non-loads") },
1083 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1084 N_("Allow speculative motion of some loads") },
1085 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1086 N_("Allow speculative motion of more loads") },
1087 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1088 N_("Replace add,compare,branch with branch on count reg") },
1089 {"pic", &flag_pic, 1,
1090 N_("Generate position independent code, if possible") },
1091 {"PIC", &flag_pic, 2, ""},
1092 {"exceptions", &flag_exceptions, 1,
1093 N_("Enable exception handling") },
1094 {"unwind-tables", &flag_unwind_tables, 1,
1095 N_("Just generate unwind tables for exception handling") },
1096 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1097 N_("Generate unwind tables exact at each instruction boundary") },
1098 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1099 N_("Support synchronous non-call exceptions") },
1100 {"profile-arcs", &profile_arc_flag, 1,
1101 N_("Insert arc based program profiling code") },
1102 {"test-coverage", &flag_test_coverage, 1,
1103 N_("Create data files needed by gcov") },
1104 {"branch-probabilities", &flag_branch_probabilities, 1,
1105 N_("Use profiling information for branch probabilities") },
1106 {"profile", &profile_flag, 1,
1107 N_("Enable basic program profiling code") },
1108 {"reorder-blocks", &flag_reorder_blocks, 1,
1109 N_("Reorder basic blocks to improve code placement") },
1110 {"reorder-functions", &flag_reorder_functions, 1,
1111 N_("Reorder functions to improve code placement") },
1112 {"rename-registers", &flag_rename_registers, 1,
1113 N_("Do the register renaming optimization pass") },
1114 {"cprop-registers", &flag_cprop_registers, 1,
1115 N_("Do the register copy-propagation optimization pass") },
1116 {"common", &flag_no_common, 0,
1117 N_("Do not put uninitialized globals in the common section") },
1118 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1119 N_("Do not generate .size directives") },
1120 {"function-sections", &flag_function_sections, 1,
1121 N_("place each function into its own section") },
1122 {"data-sections", &flag_data_sections, 1,
1123 N_("place data items into their own section") },
1124 {"verbose-asm", &flag_verbose_asm, 1,
1125 N_("Add extra commentary to assembler output") },
1126 {"gnu-linker", &flag_gnu_linker, 1,
1127 N_("Output GNU ld formatted global initializers") },
1128 {"regmove", &flag_regmove, 1,
1129 N_("Enables a register move optimization") },
1130 {"optimize-register-move", &flag_regmove, 1,
1131 N_("Do the full regmove optimization pass") },
1132 {"pack-struct", &flag_pack_struct, 1,
1133 N_("Pack structure members together without holes") },
1134 {"stack-check", &flag_stack_check, 1,
1135 N_("Insert stack checking code into the program") },
1136 {"argument-alias", &flag_argument_noalias, 0,
1137 N_("Specify that arguments may alias each other & globals") },
1138 {"argument-noalias", &flag_argument_noalias, 1,
1139 N_("Assume arguments may alias globals but not each other") },
1140 {"argument-noalias-global", &flag_argument_noalias, 2,
1141 N_("Assume arguments do not alias each other or globals") },
1142 {"strict-aliasing", &flag_strict_aliasing, 1,
1143 N_("Assume strict aliasing rules apply") },
1144 {"align-loops", &align_loops, 0,
1145 N_("Align the start of loops") },
1146 {"align-jumps", &align_jumps, 0,
1147 N_("Align labels which are only reached by jumping") },
1148 {"align-labels", &align_labels, 0,
1149 N_("Align all labels") },
1150 {"align-functions", &align_functions, 0,
1151 N_("Align the start of functions") },
1152 {"merge-constants", &flag_merge_constants, 1,
1153 N_("Attempt to merge identical constants across compilation units") },
1154 {"merge-all-constants", &flag_merge_constants, 2,
1155 N_("Attempt to merge identical constants and constant variables") },
1156 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1157 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1158 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1159 N_("Instrument function entry/exit with profiling calls") },
1160 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1161 N_("Put zero initialized data in the bss section") },
1162 {"ssa", &flag_ssa, 1,
1163 N_("Enable SSA optimizations") },
1164 {"ssa-ccp", &flag_ssa_ccp, 1,
1165 N_("Enable SSA conditional constant propagation") },
1166 {"ssa-dce", &flag_ssa_dce, 1,
1167 N_("Enable aggressive SSA dead code elimination") },
1168 {"leading-underscore", &flag_leading_underscore, 1,
1169 N_("External symbols have a leading underscore") },
1170 {"ident", &flag_no_ident, 0,
1171 N_("Process #ident directives") },
1172 { "peephole2", &flag_peephole2, 1,
1173 N_("Enables an rtl peephole pass run before sched2") },
1174 {"finite-math-only", &flag_finite_math_only, 1,
1175 N_("Assume no NaNs or +-Infs are generated") },
1176 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1177 N_("Enables guessing of branch probabilities") },
1178 {"math-errno", &flag_errno_math, 1,
1179 N_("Set errno after built-in math functions") },
1180 {"trapping-math", &flag_trapping_math, 1,
1181 N_("Floating-point operations can trap") },
1182 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1183 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1184 {"signaling-nans", &flag_signaling_nans, 1,
1185 N_("Disable optimizations observable by IEEE signaling NaNs") },
1186 {"bounds-check", &flag_bounds_check, 1,
1187 N_("Generate code to check bounds before indexing arrays") },
1188 {"single-precision-constant", &flag_single_precision_constant, 1,
1189 N_("Convert floating point constant to single precision constant") },
1190 {"time-report", &time_report, 1,
1191 N_("Report time taken by each compiler pass at end of run") },
1192 {"mem-report", &mem_report, 1,
1193 N_("Report on permanent memory allocation at end of run") },
1194 { "trapv", &flag_trapv, 1,
1195 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1196 { "new-ra", &flag_new_regalloc, 1,
1197 N_("Use graph coloring register allocation.") },
1200 /* Table of language-specific options. */
1202 static const struct lang_opt
1204 const char *const option;
1205 const char *const description;
1207 documented_lang_options[] =
1209 /* In order not to overload the --help output, the convention
1210 used here is to only describe those options which are not
1211 enabled by default. */
1214 N_("Compile just for ISO C90") },
1216 N_("Determine language standard") },
1218 { "-fsigned-bitfields", "" },
1219 { "-funsigned-bitfields",
1220 N_("Make bit-fields by unsigned by default") },
1221 { "-fno-signed-bitfields", "" },
1222 { "-fno-unsigned-bitfields","" },
1224 N_("Make 'char' be signed by default") },
1225 { "-funsigned-char",
1226 N_("Make 'char' be unsigned by default") },
1227 { "-fno-signed-char", "" },
1228 { "-fno-unsigned-char", "" },
1232 N_("Do not recognize the 'asm' keyword") },
1233 { "-fbuiltin", "" },
1235 N_("Do not recognize any built in functions") },
1237 N_("Assume normal C execution environment") },
1238 { "-fno-hosted", "" },
1240 N_("Assume that standard libraries & main might not exist") },
1241 { "-fno-freestanding", "" },
1242 { "-fcond-mismatch",
1243 N_("Allow different types as args of ? operator") },
1244 { "-fno-cond-mismatch", "" },
1245 { "-fdollars-in-identifiers",
1246 N_("Allow the use of $ inside identifiers") },
1247 { "-fno-dollars-in-identifiers", "" },
1248 { "-fpreprocessed", "" },
1249 { "-fno-preprocessed", "" },
1251 N_("Use the same size for double as for float") },
1252 { "-fno-short-double", "" },
1254 N_("Use the smallest fitting integer to hold enums") },
1255 { "-fno-short-enums", "" },
1257 N_("Override the underlying type for wchar_t to `unsigned short'") },
1258 { "-fno-short-wchar", "" },
1261 N_("Enable most warning messages") },
1262 { "-Wbad-function-cast",
1263 N_("Warn about casting functions to incompatible types") },
1264 { "-Wno-bad-function-cast", "" },
1265 { "-Wmissing-format-attribute",
1266 N_("Warn about functions which might be candidates for format attributes") },
1267 { "-Wno-missing-format-attribute", "" },
1269 N_("Warn about casts which discard qualifiers") },
1270 { "-Wno-cast-qual", "" },
1271 { "-Wchar-subscripts",
1272 N_("Warn about subscripts whose type is 'char'") },
1273 { "-Wno-char-subscripts", "" },
1275 N_("Warn if nested comments are detected") },
1276 { "-Wno-comment", "" },
1278 N_("Warn if nested comments are detected") },
1279 { "-Wno-comments", "" },
1281 N_("Warn about possibly confusing type conversions") },
1282 { "-Wno-conversion", "" },
1283 { "-Wdiv-by-zero", "" },
1284 { "-Wno-div-by-zero",
1285 N_("Do not warn about compile-time integer division by zero") },
1287 N_("Warn about testing equality of floating point numbers") },
1288 { "-Wno-float-equal", "" },
1290 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1291 { "-Wno-format", "" },
1292 { "-Wformat-extra-args", "" },
1293 { "-Wno-format-extra-args",
1294 N_("Don't warn about too many arguments to format functions") },
1295 { "-Wformat-nonliteral",
1296 N_("Warn about non-string-literal format strings") },
1297 { "-Wno-format-nonliteral", "" },
1298 { "-Wformat-security",
1299 N_("Warn about possible security problems with format functions") },
1300 { "-Wno-format-security", "" },
1301 { "-Wformat-y2k", "" },
1302 { "-Wno-format-y2k",
1303 N_("Don't warn about strftime formats yielding 2 digit years") },
1304 { "-Wimplicit-function-declaration",
1305 N_("Warn about implicit function declarations") },
1306 { "-Wno-implicit-function-declaration", "" },
1307 { "-Werror-implicit-function-declaration", "" },
1309 N_("Warn when a declaration does not specify a type") },
1310 { "-Wno-implicit-int", "" },
1311 { "-Wimplicit", "" },
1312 { "-Wno-implicit", "" },
1314 N_("Warn about the use of the #import directive") },
1315 { "-Wno-import", "" },
1316 { "-Wlong-long","" },
1318 N_("Do not warn about using 'long long' when -pedantic") },
1320 N_("Warn about suspicious declarations of main") },
1321 { "-Wno-main", "" },
1322 { "-Wmissing-braces",
1323 N_("Warn about possibly missing braces around initializers") },
1324 { "-Wno-missing-braces", "" },
1325 { "-Wmissing-declarations",
1326 N_("Warn about global funcs without previous declarations") },
1327 { "-Wno-missing-declarations", "" },
1328 { "-Wmissing-prototypes",
1329 N_("Warn about global funcs without prototypes") },
1330 { "-Wno-missing-prototypes", "" },
1332 N_("Warn about use of multicharacter literals") },
1333 { "-Wno-multichar", "" },
1334 { "-Wnested-externs",
1335 N_("Warn about externs not at file scope level") },
1336 { "-Wno-nested-externs", "" },
1338 N_("Warn about possible missing parentheses") },
1339 { "-Wno-parentheses", "" },
1340 { "-Wpointer-arith",
1341 N_("Warn about function pointer arithmetic") },
1342 { "-Wno-pointer-arith", "" },
1343 { "-Wredundant-decls",
1344 N_("Warn about multiple declarations of the same object") },
1345 { "-Wno-redundant-decls", "" },
1347 N_("Warn whenever a function's return-type defaults to int") },
1348 { "-Wno-return-type", "" },
1349 { "-Wsequence-point",
1350 N_("Warn about possible violations of sequence point rules") },
1351 { "-Wno-sequence-point", "" },
1353 N_("Warn about signed/unsigned comparisons") },
1354 { "-Wno-sign-compare", "" },
1355 { "-Wstrict-prototypes",
1356 N_("Warn about non-prototyped function decls") },
1357 { "-Wno-strict-prototypes", "" },
1359 N_("Warn about constructs whose meanings change in ISO C") },
1360 { "-Wno-traditional", "" },
1362 N_("Warn when trigraphs are encountered") },
1363 { "-Wno-trigraphs", "" },
1365 { "-Wno-undef", "" },
1366 { "-Wunknown-pragmas",
1367 N_("Warn about unrecognized pragmas") },
1368 { "-Wno-unknown-pragmas", "" },
1369 { "-Wwrite-strings",
1370 N_("Mark strings as 'const char *'") },
1371 { "-Wno-write-strings", "" },
1373 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1375 #include "options.h"
1379 /* Here is a table, controlled by the tm.h file, listing each -m switch
1380 and which bits in `target_switches' it should set or clear.
1381 If VALUE is positive, it is bits to set.
1382 If VALUE is negative, -VALUE is bits to clear.
1383 (The sign bit is not used so there is no confusion.) */
1387 const char *const name;
1389 const char *const description;
1391 target_switches[] = TARGET_SWITCHES;
1393 /* This table is similar, but allows the switch to have a value. */
1395 #ifdef TARGET_OPTIONS
1398 const char *const prefix;
1399 const char **const variable;
1400 const char *const description;
1402 target_options[] = TARGET_OPTIONS;
1405 /* Options controlling warnings. */
1407 /* Don't print warning messages. -w. */
1409 int inhibit_warnings = 0;
1411 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1413 int warn_system_headers = 0;
1415 /* Print various extra warnings. -W. */
1417 int extra_warnings = 0;
1419 /* Treat warnings as errors. -Werror. */
1421 int warnings_are_errors = 0;
1423 /* Nonzero to warn about unused variables, functions et.al. */
1425 int warn_unused_function;
1426 int warn_unused_label;
1427 int warn_unused_parameter;
1428 int warn_unused_variable;
1429 int warn_unused_value;
1431 /* Nonzero to warn about code which is never reached. */
1433 int warn_notreached;
1435 /* Nonzero to warn about variables used before they are initialized. */
1437 int warn_uninitialized;
1439 /* Nonzero means warn about all declarations which shadow others. */
1443 /* Warn if a switch on an enum, that does not have a default case,
1444 fails to have a case for every enum value. */
1448 /* Warn if a switch does not have a default case. */
1450 int warn_switch_default;
1452 /* Warn if a switch on an enum fails to have a case for every enum
1453 value (regardless of the presence or otherwise of a default case). */
1455 int warn_switch_enum;
1457 /* Nonzero means warn about function definitions that default the return type
1458 or that use a null return and have a return-type other than void. */
1460 int warn_return_type;
1462 /* Nonzero means warn about pointer casts that increase the required
1463 alignment of the target type (and might therefore lead to a crash
1464 due to a misaligned access). */
1466 int warn_cast_align;
1468 /* Nonzero means warn about any objects definitions whose size is larger
1469 than N bytes. Also want about function definitions whose returned
1470 values are larger than N bytes. The value N is in `larger_than_size'. */
1472 int warn_larger_than;
1473 HOST_WIDE_INT larger_than_size;
1475 /* Nonzero means warn if inline function is too large. */
1479 /* Warn if a function returns an aggregate,
1480 since there are often incompatible calling conventions for doing this. */
1482 int warn_aggregate_return;
1484 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1488 /* Warn when gcc pads a structure to an alignment boundary. */
1492 /* Warn when an optimization pass is disabled. */
1494 int warn_disabled_optimization;
1496 /* Warn about functions which might be candidates for attribute noreturn. */
1498 int warn_missing_noreturn;
1500 /* Nonzero means warn about uses of __attribute__((deprecated))
1503 int warn_deprecated_decl = 1;
1505 /* Nonzero means warn about constructs which might not be
1506 strict-aliasing safe. */
1508 int warn_strict_aliasing;
1510 /* Likewise for -W. */
1512 static const lang_independent_options W_options[] =
1514 {"unused-function", &warn_unused_function, 1,
1515 N_("Warn when a function is unused") },
1516 {"unused-label", &warn_unused_label, 1,
1517 N_("Warn when a label is unused") },
1518 {"unused-parameter", &warn_unused_parameter, 1,
1519 N_("Warn when a function parameter is unused") },
1520 {"unused-variable", &warn_unused_variable, 1,
1521 N_("Warn when a variable is unused") },
1522 {"unused-value", &warn_unused_value, 1,
1523 N_("Warn when an expression value is unused") },
1524 {"system-headers", &warn_system_headers, 1,
1525 N_("Do not suppress warnings from system headers") },
1526 {"error", &warnings_are_errors, 1,
1527 N_("Treat all warnings as errors") },
1528 {"shadow", &warn_shadow, 1,
1529 N_("Warn when one local variable shadows another") },
1530 {"switch", &warn_switch, 1,
1531 N_("Warn about enumerated switches, with no default, missing a case") },
1532 {"switch-default", &warn_switch_default, 1,
1533 N_("Warn about enumerated switches missing a default case") },
1534 {"switch-enum", &warn_switch_enum, 1,
1535 N_("Warn about all enumerated switches missing a specific case") },
1536 {"aggregate-return", &warn_aggregate_return, 1,
1537 N_("Warn about returning structures, unions or arrays") },
1538 {"cast-align", &warn_cast_align, 1,
1539 N_("Warn about pointer casts which increase alignment") },
1540 {"unreachable-code", &warn_notreached, 1,
1541 N_("Warn about code that will never be executed") },
1542 {"uninitialized", &warn_uninitialized, 1,
1543 N_("Warn about uninitialized automatic variables") },
1544 {"inline", &warn_inline, 1,
1545 N_("Warn when an inlined function cannot be inlined") },
1546 {"packed", &warn_packed, 1,
1547 N_("Warn when the packed attribute has no effect on struct layout") },
1548 {"padded", &warn_padded, 1,
1549 N_("Warn when padding is required to align struct members") },
1550 {"disabled-optimization", &warn_disabled_optimization, 1,
1551 N_("Warn when an optimization pass is disabled") },
1552 {"deprecated-declarations", &warn_deprecated_decl, 1,
1553 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1554 {"missing-noreturn", &warn_missing_noreturn, 1,
1555 N_("Warn about functions which might be candidates for attribute noreturn") },
1556 {"strict-aliasing", &warn_strict_aliasing, 1,
1557 N_ ("Warn about code which might break the strict aliasing rules") }
1561 set_Wunused (setting)
1564 warn_unused_function = setting;
1565 warn_unused_label = setting;
1566 /* Unused function parameter warnings are reported when either ``-W
1567 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1568 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1570 warn_unused_parameter = 0;
1571 else if (!warn_unused_parameter)
1572 warn_unused_parameter = -1;
1573 warn_unused_variable = setting;
1574 warn_unused_value = setting;
1577 /* The following routines are useful in setting all the flags that
1578 -ffast-math and -fno-fast-math imply. */
1581 set_fast_math_flags (set)
1584 flag_trapping_math = !set;
1585 flag_unsafe_math_optimizations = set;
1586 flag_finite_math_only = set;
1587 flag_errno_math = !set;
1589 flag_signaling_nans = 0;
1592 /* Return true iff flags are set as if -ffast-math. */
1594 fast_math_flags_set_p ()
1596 return (!flag_trapping_math
1597 && flag_unsafe_math_optimizations
1598 && flag_finite_math_only
1599 && !flag_errno_math);
1603 /* Output files for assembler code (real compiler output)
1604 and debugging dumps. */
1607 FILE *aux_info_file;
1608 FILE *rtl_dump_file = NULL;
1610 /* Decode the string P as an integral parameter.
1611 If the string is indeed an integer return its numeric value else
1612 issue an Invalid Option error for the option PNAME and return DEFVAL.
1613 If PNAME is zero just return DEFVAL, do not call error. */
1616 read_integral_parameter (p, pname, defval)
1621 const char *endp = p;
1625 if (ISDIGIT (*endp))
1634 error ("invalid option `%s'", pname);
1641 /* This calls abort and is used to avoid problems when abort is a macro.
1642 It is used when we need to pass the address of abort. */
1650 /* When `malloc.c' is compiled with `rcheck' defined,
1651 it calls this function to report clobberage. */
1655 const char *s ATTRIBUTE_UNUSED;
1660 /* Return the logarithm of X, base 2, considering X unsigned,
1661 if X is a power of 2. Otherwise, returns -1.
1663 This should be used via the `exact_log2' macro. */
1667 unsigned HOST_WIDE_INT x;
1670 /* Test for 0 or a power of 2. */
1671 if (x == 0 || x != (x & -x))
1673 while ((x >>= 1) != 0)
1678 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1679 If X is 0, return -1.
1681 This should be used via the floor_log2 macro. */
1685 unsigned HOST_WIDE_INT x;
1694 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1695 into ICE messages, which is much more user friendly. */
1698 crash_signal (signo)
1701 internal_error ("%s", strsignal (signo));
1704 /* Strip off a legitimate source ending from the input string NAME of
1705 length LEN. Rather than having to know the names used by all of
1706 our front ends, we strip off an ending of a period followed by
1707 up to five characters. (Java uses ".class".) */
1710 strip_off_ending (name, len)
1715 for (i = 2; i < 6 && len > i; i++)
1717 if (name[len - i] == '.')
1719 name[len - i] = '\0';
1725 /* Output a quoted string. */
1728 output_quoted_string (asm_file, string)
1732 #ifdef OUTPUT_QUOTED_STRING
1733 OUTPUT_QUOTED_STRING (asm_file, string);
1737 putc ('\"', asm_file);
1738 while ((c = *string++) != 0)
1742 if (c == '\"' || c == '\\')
1743 putc ('\\', asm_file);
1747 fprintf (asm_file, "\\%03o", (unsigned char) c);
1749 putc ('\"', asm_file);
1753 /* Output NAME into FILE after having turned it into something
1754 usable as an identifier in a target's assembly file. */
1756 output_clean_symbol_name (file, name)
1760 /* Make a copy of NAME. */
1761 char *id = xstrdup (name);
1763 /* Make it look like a valid identifier for an assembler. */
1764 clean_symbol_name (id);
1771 /* Output a file name in the form wanted by System V. */
1774 output_file_directive (asm_file, input_name)
1776 const char *input_name;
1778 int len = strlen (input_name);
1779 const char *na = input_name + len;
1781 /* NA gets INPUT_NAME sans directory names. */
1782 while (na > input_name)
1784 if (IS_DIR_SEPARATOR (na[-1]))
1789 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1790 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1792 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1793 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1795 fprintf (asm_file, "\t.file\t");
1796 output_quoted_string (asm_file, na);
1797 fputc ('\n', asm_file);
1802 /* Routine to open a dump file. Return true if the dump file is enabled. */
1805 open_dump_file (index, decl)
1806 enum dump_file_index index;
1810 const char *open_arg;
1813 if (! dump_file[index].enabled)
1816 timevar_push (TV_DUMP);
1817 if (rtl_dump_file != NULL)
1818 fclose (rtl_dump_file);
1820 sprintf (seq, DUMPFILE_FORMAT, index);
1822 if (! dump_file[index].initialized)
1824 /* If we've not initialized the files, do so now. */
1825 if (graph_dump_format != no_graph
1826 && dump_file[index].graph_dump_p)
1828 dump_name = concat (seq, dump_file[index].extension, NULL);
1829 clean_graph_dump_file (dump_base_name, dump_name);
1832 dump_file[index].initialized = 1;
1838 dump_name = concat (dump_base_name, seq,
1839 dump_file[index].extension, NULL);
1841 rtl_dump_file = fopen (dump_name, open_arg);
1842 if (rtl_dump_file == NULL)
1843 fatal_io_error ("can't open %s", dump_name);
1848 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1849 (*lang_hooks.decl_printable_name) (decl, 2),
1850 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1852 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1853 ? " (unlikely executed)"
1856 timevar_pop (TV_DUMP);
1860 /* Routine to close a dump file. */
1863 close_dump_file (index, func, insns)
1864 enum dump_file_index index;
1865 void (*func) PARAMS ((FILE *, rtx));
1868 if (! rtl_dump_file)
1871 timevar_push (TV_DUMP);
1873 && graph_dump_format != no_graph
1874 && dump_file[index].graph_dump_p)
1879 sprintf (seq, DUMPFILE_FORMAT, index);
1880 suffix = concat (seq, dump_file[index].extension, NULL);
1881 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1886 func (rtl_dump_file, insns);
1888 fflush (rtl_dump_file);
1889 fclose (rtl_dump_file);
1891 rtl_dump_file = NULL;
1892 timevar_pop (TV_DUMP);
1895 /* Do any final processing required for the declarations in VEC, of
1896 which there are LEN. We write out inline functions and variables
1897 that have been deferred until this point, but which are required.
1898 Returns nonzero if anything was put out. */
1901 wrapup_global_declarations (vec, len)
1908 int output_something = 0;
1910 for (i = 0; i < len; i++)
1914 /* We're not deferring this any longer. Assignment is
1915 conditional to avoid needlessly dirtying PCH pages. */
1916 if (DECL_DEFER_OUTPUT (decl) != 0)
1917 DECL_DEFER_OUTPUT (decl) = 0;
1919 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1920 (*lang_hooks.finish_incomplete_decl) (decl);
1923 /* Now emit any global variables or functions that we have been
1924 putting off. We need to loop in case one of the things emitted
1925 here references another one which comes earlier in the list. */
1929 for (i = 0; i < len; i++)
1933 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1936 /* Don't write out static consts, unless we still need them.
1938 We also keep static consts if not optimizing (for debugging),
1939 unless the user specified -fno-keep-static-consts.
1940 ??? They might be better written into the debug information.
1941 This is possible when using DWARF.
1943 A language processor that wants static constants to be always
1944 written out (even if it is not used) is responsible for
1945 calling rest_of_decl_compilation itself. E.g. the C front-end
1946 calls rest_of_decl_compilation from finish_decl.
1947 One motivation for this is that is conventional in some
1948 environments to write things like:
1949 static const char rcsid[] = "... version string ...";
1950 intending to force the string to be in the executable.
1952 A language processor that would prefer to have unneeded
1953 static constants "optimized away" would just defer writing
1954 them out until here. E.g. C++ does this, because static
1955 constants are often defined in header files.
1957 ??? A tempting alternative (for both C and C++) would be
1958 to force a constant to be written if and only if it is
1959 defined in a main file, as opposed to an include file. */
1961 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1965 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1967 else if (DECL_COMDAT (decl))
1969 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1970 && (optimize || !flag_keep_static_consts
1971 || DECL_ARTIFICIAL (decl)))
1977 rest_of_decl_compilation (decl, NULL, 1, 1);
1981 if (TREE_CODE (decl) == FUNCTION_DECL
1982 && DECL_INITIAL (decl) != 0
1983 && DECL_SAVED_INSNS (decl) != 0
1984 && (flag_keep_inline_functions
1985 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1986 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1989 output_inline_function (decl);
1994 output_something = 1;
1998 return output_something;
2001 /* Issue appropriate warnings for the global declarations in VEC (of
2002 which there are LEN). Output debugging information for them. */
2005 check_global_declarations (vec, len)
2012 for (i = 0; i < len; i++)
2016 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2017 && ! TREE_ASM_WRITTEN (decl))
2018 /* Cancel the RTL for this decl so that, if debugging info
2019 output for global variables is still to come,
2020 this one will be omitted. */
2021 SET_DECL_RTL (decl, NULL_RTX);
2023 /* Warn about any function
2024 declared static but not defined.
2025 We don't warn about variables,
2026 because many programs have static variables
2027 that exist only to get some text into the object file. */
2028 if (TREE_CODE (decl) == FUNCTION_DECL
2029 && (warn_unused_function
2030 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2031 && DECL_INITIAL (decl) == 0
2032 && DECL_EXTERNAL (decl)
2033 && ! DECL_ARTIFICIAL (decl)
2034 && ! TREE_PUBLIC (decl))
2036 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2037 pedwarn_with_decl (decl,
2038 "`%s' used but never defined");
2040 warning_with_decl (decl,
2041 "`%s' declared `static' but never defined");
2042 /* This symbol is effectively an "extern" declaration now. */
2043 TREE_PUBLIC (decl) = 1;
2044 assemble_external (decl);
2047 /* Warn about static fns or vars defined but not used. */
2048 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2049 /* We don't warn about "static const" variables because the
2050 "rcs_id" idiom uses that construction. */
2051 || (warn_unused_variable
2052 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2053 && ! DECL_IN_SYSTEM_HEADER (decl)
2054 && ! TREE_USED (decl)
2055 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2056 to handle multiple external decls in different scopes. */
2057 && ! TREE_USED (DECL_NAME (decl))
2058 && ! DECL_EXTERNAL (decl)
2059 && ! TREE_PUBLIC (decl)
2060 /* Global register variables must be declared to reserve them. */
2061 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2062 /* Otherwise, ask the language. */
2063 && (*lang_hooks.decls.warn_unused_global) (decl))
2064 warning_with_decl (decl, "`%s' defined but not used");
2066 /* Avoid confusing the debug information machinery when there are
2068 if (errorcount == 0 && sorrycount == 0)
2070 timevar_push (TV_SYMOUT);
2071 (*debug_hooks->global_decl) (decl);
2072 timevar_pop (TV_SYMOUT);
2077 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2078 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2079 INPUT_FILENAME and LINENO accordingly. */
2082 push_srcloc (file, line)
2086 struct file_stack *fs;
2088 if (input_file_stack)
2090 input_file_stack->name = input_filename;
2091 input_file_stack->line = lineno;
2094 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2095 fs->name = input_filename = file;
2096 fs->line = lineno = line;
2097 fs->next = input_file_stack;
2098 input_file_stack = fs;
2099 input_file_stack_tick++;
2102 /* Pop the top entry off the stack of presently open source files.
2103 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2109 struct file_stack *fs;
2111 fs = input_file_stack;
2112 input_file_stack = fs->next;
2114 input_file_stack_tick++;
2115 /* The initial source file is never popped. */
2116 if (!input_file_stack)
2118 input_filename = input_file_stack->name;
2119 lineno = input_file_stack->line;
2122 /* Compile an entire translation unit. Write a file of assembly
2123 output and various debugging dumps. */
2128 /* Initialize yet another pass. */
2130 init_final (main_input_filename);
2131 init_branch_prob (aux_base_name);
2133 timevar_push (TV_PARSE);
2135 /* Call the parser, which parses the entire file (calling
2136 rest_of_compilation for each function). */
2137 (*lang_hooks.parse_file) (set_yydebug);
2139 /* In case there were missing block closers,
2140 get us back to the global binding level. */
2141 (*lang_hooks.clear_binding_stack) ();
2143 /* Compilation is now finished except for writing
2144 what's left of the symbol table output. */
2145 timevar_pop (TV_PARSE);
2147 if (flag_syntax_only)
2150 (*lang_hooks.decls.final_write_globals)();
2152 /* This must occur after the loop to output deferred functions. Else
2153 the profiler initializer would not be emitted if all the functions
2154 in this compilation unit were deferred.
2156 output_func_start_profiler can not cause any additional functions or
2157 data to need to be output, so it need not be in the deferred function
2159 output_func_start_profiler ();
2161 /* Write out any pending weak symbol declarations. */
2165 /* Do dbx symbols. */
2166 timevar_push (TV_SYMOUT);
2168 #ifdef DWARF2_UNWIND_INFO
2169 if (dwarf2out_do_frame ())
2170 dwarf2out_frame_finish ();
2173 (*debug_hooks->finish) (main_input_filename);
2174 timevar_pop (TV_SYMOUT);
2176 /* Output some stuff at end of file if nec. */
2178 dw2_output_indirect_constants ();
2180 end_final (aux_base_name);
2182 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2184 timevar_push (TV_DUMP);
2185 open_dump_file (DFI_bp, NULL);
2189 close_dump_file (DFI_bp, NULL, NULL_RTX);
2190 timevar_pop (TV_DUMP);
2194 ASM_FILE_END (asm_out_file);
2197 /* Attach a special .ident directive to the end of the file to identify
2198 the version of GCC which compiled this code. The format of the .ident
2199 string is patterned after the ones produced by native SVR4 compilers. */
2202 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2203 IDENT_ASM_OP, version_string);
2206 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2208 timevar_push (TV_DUMP);
2209 dump_combine_total_stats (rtl_dump_file);
2210 close_dump_file (DFI_combine, NULL, NULL_RTX);
2211 timevar_pop (TV_DUMP);
2215 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2216 and TYPE_DECL nodes.
2218 This does nothing for local (non-static) variables, unless the
2219 variable is a register variable with an ASMSPEC. In that case, or
2220 if the variable is not an automatic, it sets up the RTL and
2221 outputs any assembler code (label definition, storage allocation
2222 and initialization).
2224 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2225 the assembler symbol name to be used. TOP_LEVEL is nonzero
2226 if this declaration is not within a function. */
2229 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2231 const char *asmspec;
2235 /* Declarations of variables, and of functions defined elsewhere. */
2237 /* The most obvious approach, to put an #ifndef around where
2238 this macro is used, doesn't work since it's inside a macro call. */
2239 #ifndef ASM_FINISH_DECLARE_OBJECT
2240 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2243 /* We deferred calling assemble_alias so that we could collect
2244 other attributes such as visibility. Emit the alias now. */
2247 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2250 alias = TREE_VALUE (TREE_VALUE (alias));
2251 alias = get_identifier (TREE_STRING_POINTER (alias));
2252 assemble_alias (decl, alias);
2256 /* Forward declarations for nested functions are not "external",
2257 but we need to treat them as if they were. */
2258 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2259 || TREE_CODE (decl) == FUNCTION_DECL)
2261 timevar_push (TV_VARCONST);
2264 make_decl_rtl (decl, asmspec);
2266 /* Don't output anything when a tentative file-scope definition
2267 is seen. But at end of compilation, do output code for them. */
2268 if (at_end || !DECL_DEFER_OUTPUT (decl))
2269 assemble_variable (decl, top_level, at_end, 0);
2270 if (decl == last_assemble_variable_decl)
2272 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2276 timevar_pop (TV_VARCONST);
2278 else if (DECL_REGISTER (decl) && asmspec != 0)
2280 if (decode_reg_name (asmspec) >= 0)
2282 SET_DECL_RTL (decl, NULL_RTX);
2283 make_decl_rtl (decl, asmspec);
2287 error ("invalid register name `%s' for register variable", asmspec);
2288 DECL_REGISTER (decl) = 0;
2293 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2294 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2295 && TREE_CODE (decl) == TYPE_DECL)
2297 timevar_push (TV_SYMOUT);
2298 dbxout_symbol (decl, 0);
2299 timevar_pop (TV_SYMOUT);
2302 #ifdef SDB_DEBUGGING_INFO
2303 else if (write_symbols == SDB_DEBUG && top_level
2304 && TREE_CODE (decl) == TYPE_DECL)
2306 timevar_push (TV_SYMOUT);
2307 sdbout_symbol (decl, 0);
2308 timevar_pop (TV_SYMOUT);
2311 #ifdef DWARF2_DEBUGGING_INFO
2312 else if ((write_symbols == DWARF2_DEBUG
2313 || write_symbols == VMS_AND_DWARF2_DEBUG)
2315 && TREE_CODE (decl) == TYPE_DECL)
2317 timevar_push (TV_SYMOUT);
2318 dwarf2out_decl (decl);
2319 timevar_pop (TV_SYMOUT);
2324 /* Called after finishing a record, union or enumeral type. */
2327 rest_of_type_compilation (type, toplev)
2328 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2332 tree type ATTRIBUTE_UNUSED;
2333 int toplev ATTRIBUTE_UNUSED;
2336 /* Avoid confusing the debug information machinery when there are
2338 if (errorcount != 0 || sorrycount != 0)
2341 timevar_push (TV_SYMOUT);
2342 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2343 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2344 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2346 #ifdef SDB_DEBUGGING_INFO
2347 if (write_symbols == SDB_DEBUG)
2348 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2350 #ifdef DWARF2_DEBUGGING_INFO
2351 if ((write_symbols == DWARF2_DEBUG
2352 || write_symbols == VMS_AND_DWARF2_DEBUG)
2354 dwarf2out_decl (TYPE_STUB_DECL (type));
2356 timevar_pop (TV_SYMOUT);
2359 /* This is called from finish_function (within langhooks.parse_file)
2360 after each top-level definition is parsed.
2361 It is supposed to compile that function or variable
2362 and output the assembler code for it.
2363 After we return, the tree storage is freed. */
2366 rest_of_compilation (decl)
2372 int rebuild_label_notes_after_reload;
2373 int register_life_up_to_date;
2375 timevar_push (TV_REST_OF_COMPILATION);
2377 /* Now that we're out of the frontend, we shouldn't have any more
2378 CONCATs anywhere. */
2379 generating_concat_p = 0;
2381 /* When processing delayed functions, prepare_function_start() won't
2382 have been run to re-initialize it. */
2383 cse_not_expected = ! optimize;
2385 /* First, make sure that NOTE_BLOCK is set correctly for each
2386 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2387 if (!cfun->x_whole_function_mode_p)
2390 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2391 tree in sensible shape. So, we just recalculate it here. */
2392 if (cfun->x_whole_function_mode_p)
2397 /* If we are reconsidering an inline function
2398 at the end of compilation, skip the stuff for making it inline. */
2400 if (DECL_SAVED_INSNS (decl) == 0)
2406 /* If this is nested inside an inlined external function, pretend
2407 it was only declared. Since we cannot inline such functions,
2408 generating code for this one is not only not necessary but will
2409 confuse some debugging output writers. */
2410 for (parent = DECL_CONTEXT (current_function_decl);
2411 parent != NULL_TREE;
2412 parent = get_containing_scope (parent))
2413 if (TREE_CODE (parent) == FUNCTION_DECL
2414 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2416 DECL_INITIAL (decl) = 0;
2417 goto exit_rest_of_compilation;
2419 else if (TYPE_P (parent))
2420 /* A function in a local class should be treated normally. */
2423 /* If requested, consider whether to make this function inline. */
2424 if ((DECL_INLINE (decl) && !flag_no_inline)
2425 || flag_inline_functions)
2427 timevar_push (TV_INTEGRATION);
2428 lose = function_cannot_inline_p (decl);
2429 timevar_pop (TV_INTEGRATION);
2430 if (lose || ! optimize)
2432 if (warn_inline && DECL_INLINE (decl))
2433 warning_with_decl (decl, lose);
2434 DECL_ABSTRACT_ORIGIN (decl) = 0;
2435 /* Don't really compile an extern inline function.
2436 If we can't make it inline, pretend
2437 it was only declared. */
2438 if (DECL_EXTERNAL (decl))
2440 DECL_INITIAL (decl) = 0;
2441 goto exit_rest_of_compilation;
2446 /* ??? Note that we used to just make it look like if
2447 the "inline" keyword was specified when we decide
2448 to inline it (because of -finline-functions).
2449 garloff at suse dot de, 2002-04-24: Add another flag to
2450 actually record this piece of information. */
2451 if (!DECL_INLINE (decl))
2452 DID_INLINE_FUNC (decl) = 1;
2453 inlinable = DECL_INLINE (decl) = 1;
2457 insns = get_insns ();
2459 /* Dump the rtl code if we are dumping rtl. */
2461 if (open_dump_file (DFI_rtl, decl))
2463 if (DECL_SAVED_INSNS (decl))
2464 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2465 close_dump_file (DFI_rtl, print_rtl, insns);
2468 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2469 sorts of eh initialization. Delay this until after the
2470 initial rtl dump so that we can see the original nesting. */
2471 convert_from_eh_region_ranges ();
2473 /* If function is inline, and we don't yet know whether to
2474 compile it by itself, defer decision till end of compilation.
2475 wrapup_global_declarations will (indirectly) call
2476 rest_of_compilation again for those functions that need to
2477 be output. Also defer those functions that we are supposed
2481 || (DECL_INLINE (decl)
2482 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2483 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2484 && ! flag_keep_inline_functions)
2485 || DECL_EXTERNAL (decl))))
2486 DECL_DEFER_OUTPUT (decl) = 1;
2488 if (DECL_INLINE (decl))
2489 /* DWARF wants separate debugging info for abstract and
2490 concrete instances of all inline functions, including those
2491 declared inline but not inlined, and those inlined even
2492 though they weren't declared inline. Conveniently, that's
2493 what DECL_INLINE means at this point. */
2494 (*debug_hooks->deferred_inline_function) (decl);
2496 if (DECL_DEFER_OUTPUT (decl))
2498 /* If -Wreturn-type, we have to do a bit of compilation. We just
2499 want to call cleanup the cfg to figure out whether or not we can
2500 fall off the end of the function; we do the minimum amount of
2501 work necessary to make that safe. */
2502 if (warn_return_type)
2504 int saved_optimize = optimize;
2507 rebuild_jump_labels (insns);
2508 find_exception_handler_labels ();
2509 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2510 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2511 optimize = saved_optimize;
2513 /* CFG is no longer maintained up-to-date. */
2514 free_bb_for_insn ();
2517 set_nothrow_function_flags ();
2518 if (current_function_nothrow)
2519 /* Now we know that this can't throw; set the flag for the benefit
2520 of other functions later in this translation unit. */
2521 TREE_NOTHROW (current_function_decl) = 1;
2523 timevar_push (TV_INTEGRATION);
2524 save_for_inline (decl);
2525 timevar_pop (TV_INTEGRATION);
2526 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2527 goto exit_rest_of_compilation;
2530 /* If specified extern inline but we aren't inlining it, we are
2531 done. This goes for anything that gets here with DECL_EXTERNAL
2532 set, not just things with DECL_INLINE. */
2533 if (DECL_EXTERNAL (decl))
2534 goto exit_rest_of_compilation;
2537 /* If we're emitting a nested function, make sure its parent gets
2538 emitted as well. Doing otherwise confuses debug info. */
2541 for (parent = DECL_CONTEXT (current_function_decl);
2542 parent != NULL_TREE;
2543 parent = get_containing_scope (parent))
2544 if (TREE_CODE (parent) == FUNCTION_DECL)
2545 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2548 /* We are now committed to emitting code for this function. Do any
2549 preparation, such as emitting abstract debug info for the inline
2550 before it gets mangled by optimization. */
2551 if (DECL_INLINE (decl))
2552 (*debug_hooks->outlining_inline_function) (decl);
2554 /* Remove any notes we don't need. That will make iterating
2555 over the instruction sequence faster, and allow the garbage
2556 collector to reclaim the memory used by the notes. */
2557 remove_unnecessary_notes ();
2562 /* Initialize some variables used by the optimizers. */
2563 init_function_for_compilation ();
2565 if (! DECL_DEFER_OUTPUT (decl))
2566 TREE_ASM_WRITTEN (decl) = 1;
2568 /* Now that integrate will no longer see our rtl, we need not
2569 distinguish between the return value of this function and the
2570 return value of called functions. Also, we can remove all SETs
2571 of subregs of hard registers; they are only here because of
2572 integrate. Also, we can now initialize pseudos intended to
2573 carry magic hard reg data throughout the function. */
2574 rtx_equal_function_value_matters = 0;
2575 purge_hard_subreg_sets (get_insns ());
2577 /* Early return if there were errors. We can run afoul of our
2578 consistency checks, and there's not really much point in fixing them.
2579 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2580 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2581 || errorcount || sorrycount)
2582 goto exit_rest_of_compilation;
2584 timevar_push (TV_JUMP);
2585 open_dump_file (DFI_sibling, decl);
2586 insns = get_insns ();
2587 rebuild_jump_labels (insns);
2588 find_exception_handler_labels ();
2589 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2591 delete_unreachable_blocks ();
2593 /* We have to issue these warnings now already, because CFG cleanups
2594 further down may destroy the required information. */
2595 check_function_return_warnings ();
2597 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2598 if (flag_guess_branch_prob)
2600 timevar_push (TV_BRANCH_PROB);
2601 note_prediction_to_br_prob ();
2602 timevar_pop (TV_BRANCH_PROB);
2605 /* We may have potential sibling or tail recursion sites. Select one
2606 (of possibly multiple) methods of performing the call. */
2607 if (flag_optimize_sibling_calls)
2610 optimize_sibling_and_tail_recursive_calls ();
2612 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2613 free_bb_for_insn ();
2614 find_exception_handler_labels ();
2615 rebuild_jump_labels (insns);
2616 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2618 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2619 notes before simplifying cfg and we must do lowering after sibcall
2620 that unhides parts of RTL chain and cleans up the CFG.
2622 Until sibcall is replaced by tree-level optimizer, lets just
2623 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2624 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2625 if (GET_CODE (insn) == NOTE
2626 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2629 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2630 timevar_pop (TV_JUMP);
2632 scope_to_insns_initialize ();
2633 /* Complete generation of exception handling code. */
2636 timevar_push (TV_JUMP);
2637 open_dump_file (DFI_eh, decl);
2639 finish_eh_generation ();
2641 close_dump_file (DFI_eh, print_rtl, get_insns ());
2642 timevar_pop (TV_JUMP);
2645 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2646 generation, which might create new sets. */
2647 emit_initial_value_sets ();
2650 /* If we are doing position-independent code generation, now
2651 is the time to output special prologues and epilogues.
2652 We do not want to do this earlier, because it just clutters
2653 up inline functions with meaningless insns. */
2658 insns = get_insns ();
2660 /* Copy any shared structure that should not be shared. */
2661 unshare_all_rtl (current_function_decl, insns);
2663 #ifdef SETJMP_VIA_SAVE_AREA
2664 /* This must be performed before virtual register instantiation.
2665 Please be aware the everything in the compiler that can look
2666 at the RTL up to this point must understand that REG_SAVE_AREA
2667 is just like a use of the REG contained inside. */
2668 if (current_function_calls_alloca)
2669 optimize_save_area_alloca (insns);
2672 /* Instantiate all virtual registers. */
2673 instantiate_virtual_regs (current_function_decl, insns);
2675 open_dump_file (DFI_jump, decl);
2677 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2678 are initialized and to compute whether control can drop off the end
2681 timevar_push (TV_JUMP);
2682 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2683 before jump optimization switches branch directions. */
2684 if (flag_guess_branch_prob)
2685 expected_value_to_br_prob ();
2687 reg_scan (insns, max_reg_num (), 0);
2688 rebuild_jump_labels (insns);
2689 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2690 delete_trivially_dead_insns (insns, max_reg_num ());
2692 dump_flow_info (rtl_dump_file);
2693 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2694 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2696 /* CFG is no longer maintained up-to-date. */
2699 free_bb_for_insn ();
2700 copy_loop_headers (insns);
2701 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2703 purge_line_number_notes (insns);
2705 timevar_pop (TV_JUMP);
2706 close_dump_file (DFI_jump, print_rtl, insns);
2708 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2709 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2711 goto exit_rest_of_compilation;
2714 /* Long term, this should probably move before the jump optimizer too,
2715 but I didn't want to disturb the rtl_dump_and_exit and related
2716 stuff at this time. */
2717 if (optimize > 0 && flag_ssa)
2719 /* Convert to SSA form. */
2721 timevar_push (TV_TO_SSA);
2722 open_dump_file (DFI_ssa, decl);
2724 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2727 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2728 timevar_pop (TV_TO_SSA);
2730 /* Perform sparse conditional constant propagation, if requested. */
2733 timevar_push (TV_SSA_CCP);
2734 open_dump_file (DFI_ssa_ccp, decl);
2738 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2739 timevar_pop (TV_SSA_CCP);
2742 /* It would be useful to cleanup the CFG at this point, but block
2743 merging and possibly other transformations might leave a PHI
2744 node in the middle of a basic block, which is a strict no-no. */
2746 /* The SSA implementation uses basic block numbers in its phi
2747 nodes. Thus, changing the control-flow graph or the basic
2748 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2749 may cause problems. */
2753 /* Remove dead code. */
2755 timevar_push (TV_SSA_DCE);
2756 open_dump_file (DFI_ssa_dce, decl);
2758 insns = get_insns ();
2759 ssa_eliminate_dead_code ();
2761 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2762 timevar_pop (TV_SSA_DCE);
2765 /* Convert from SSA form. */
2767 timevar_push (TV_FROM_SSA);
2768 open_dump_file (DFI_ussa, decl);
2770 convert_from_ssa ();
2771 /* New registers have been created. Rescan their usage. */
2772 reg_scan (insns, max_reg_num (), 1);
2774 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2775 timevar_pop (TV_FROM_SSA);
2780 timevar_push (TV_JUMP);
2782 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2784 /* Try to identify useless null pointer tests and delete them. */
2785 if (flag_delete_null_pointer_checks)
2787 open_dump_file (DFI_null, decl);
2789 dump_flow_info (rtl_dump_file);
2791 if (delete_null_pointer_checks (insns))
2792 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2794 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2797 /* Jump optimization, and the removal of NULL pointer checks, may
2798 have reduced the number of instructions substantially. CSE, and
2799 future passes, allocate arrays whose dimensions involve the
2800 maximum instruction UID, so if we can reduce the maximum UID
2801 we'll save big on memory. */
2802 renumber_insns (rtl_dump_file);
2803 timevar_pop (TV_JUMP);
2805 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2809 /* Perform common subexpression elimination.
2810 Nonzero value from `cse_main' means that jumps were simplified
2811 and some code may now be unreachable, so do
2812 jump optimization again. */
2816 open_dump_file (DFI_cse, decl);
2818 dump_flow_info (rtl_dump_file);
2819 timevar_push (TV_CSE);
2821 reg_scan (insns, max_reg_num (), 1);
2823 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2825 rebuild_jump_labels (insns);
2826 if (purge_all_dead_edges (0))
2827 delete_unreachable_blocks ();
2829 delete_trivially_dead_insns (insns, max_reg_num ());
2831 /* If we are not running more CSE passes, then we are no longer
2832 expecting CSE to be run. But always rerun it in a cheap mode. */
2833 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2835 if (tem || optimize > 1)
2836 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2837 /* Try to identify useless null pointer tests and delete them. */
2838 if (flag_delete_null_pointer_checks)
2840 timevar_push (TV_JUMP);
2842 if (delete_null_pointer_checks (insns))
2843 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2844 timevar_pop (TV_JUMP);
2847 /* The second pass of jump optimization is likely to have
2848 removed a bunch more instructions. */
2849 renumber_insns (rtl_dump_file);
2851 timevar_pop (TV_CSE);
2852 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2855 open_dump_file (DFI_addressof, decl);
2857 purge_addressof (insns);
2858 if (optimize && purge_all_dead_edges (0))
2859 delete_unreachable_blocks ();
2860 reg_scan (insns, max_reg_num (), 1);
2862 close_dump_file (DFI_addressof, print_rtl, insns);
2866 /* Perform global cse. */
2868 if (optimize > 0 && flag_gcse)
2870 int save_csb, save_cfj;
2873 timevar_push (TV_GCSE);
2874 open_dump_file (DFI_gcse, decl);
2876 tem = gcse_main (insns, rtl_dump_file);
2877 rebuild_jump_labels (insns);
2878 delete_trivially_dead_insns (insns, max_reg_num ());
2880 save_csb = flag_cse_skip_blocks;
2881 save_cfj = flag_cse_follow_jumps;
2882 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2884 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2886 if (flag_expensive_optimizations)
2888 timevar_push (TV_CSE);
2889 reg_scan (insns, max_reg_num (), 1);
2890 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2891 purge_all_dead_edges (0);
2892 delete_trivially_dead_insns (insns, max_reg_num ());
2893 timevar_pop (TV_CSE);
2894 cse_not_expected = !flag_rerun_cse_after_loop;
2897 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2898 things up. Then possibly re-run CSE again. */
2902 timevar_push (TV_JUMP);
2903 rebuild_jump_labels (insns);
2904 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2905 timevar_pop (TV_JUMP);
2907 if (flag_expensive_optimizations)
2909 timevar_push (TV_CSE);
2910 reg_scan (insns, max_reg_num (), 1);
2911 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2912 purge_all_dead_edges (0);
2913 delete_trivially_dead_insns (insns, max_reg_num ());
2914 timevar_pop (TV_CSE);
2918 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2919 timevar_pop (TV_GCSE);
2922 flag_cse_skip_blocks = save_csb;
2923 flag_cse_follow_jumps = save_cfj;
2924 #ifdef ENABLE_CHECKING
2925 verify_flow_info ();
2929 /* Move constant computations out of loops. */
2931 if (optimize > 0 && flag_loop_optimize)
2933 int do_unroll, do_prefetch;
2935 timevar_push (TV_LOOP);
2936 delete_dead_jumptables ();
2937 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2938 open_dump_file (DFI_loop, decl);
2939 /* CFG is no longer maintained up-to-date. */
2940 free_bb_for_insn ();
2942 do_unroll = flag_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2943 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2944 if (flag_rerun_loop_opt)
2946 cleanup_barriers ();
2948 /* We only want to perform unrolling once. */
2949 loop_optimize (insns, rtl_dump_file, do_unroll);
2952 /* The first call to loop_optimize makes some instructions
2953 trivially dead. We delete those instructions now in the
2954 hope that doing so will make the heuristics in loop work
2955 better and possibly speed up compilation. */
2956 delete_trivially_dead_insns (insns, max_reg_num ());
2958 /* The regscan pass is currently necessary as the alias
2959 analysis code depends on this information. */
2960 reg_scan (insns, max_reg_num (), 1);
2962 cleanup_barriers ();
2963 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2965 /* Loop can create trivially dead instructions. */
2966 delete_trivially_dead_insns (insns, max_reg_num ());
2967 close_dump_file (DFI_loop, print_rtl, insns);
2968 timevar_pop (TV_LOOP);
2969 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2974 /* Do control and data flow analysis; wrote some of the results to
2977 timevar_push (TV_FLOW);
2978 open_dump_file (DFI_cfg, decl);
2980 dump_flow_info (rtl_dump_file);
2982 cleanup_cfg (CLEANUP_EXPENSIVE
2983 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2985 /* It may make more sense to mark constant functions after dead code is
2986 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2987 may insert code making function non-constant, but we still must consider
2988 it as constant, otherwise -fbranch-probabilities will not read data back.
2990 life_analyzis rarely eliminates modification of external memory.
2993 mark_constant_function ();
2995 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2997 /* Do branch profiling and static profile estimation passes. */
2998 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3002 timevar_push (TV_BRANCH_PROB);
3003 open_dump_file (DFI_bp, decl);
3004 if (cfun->arc_profile || flag_branch_probabilities)
3007 /* Discover and record the loop depth at the head of each basic
3008 block. The loop infrastructure does the real job for us. */
3009 flow_loops_find (&loops, LOOP_TREE);
3012 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3014 /* Estimate using heuristics if no profiling info is available. */
3015 if (flag_guess_branch_prob)
3016 estimate_probability (&loops);
3018 flow_loops_free (&loops);
3019 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3020 timevar_pop (TV_BRANCH_PROB);
3024 open_dump_file (DFI_ce1, decl);
3025 if (flag_if_conversion)
3027 timevar_push (TV_IFCVT);
3029 dump_flow_info (rtl_dump_file);
3030 cleanup_cfg (CLEANUP_EXPENSIVE);
3031 reg_scan (insns, max_reg_num (), 0);
3033 timevar_pop (TV_IFCVT);
3035 timevar_push (TV_JUMP);
3036 cleanup_cfg (CLEANUP_EXPENSIVE);
3037 reg_scan (insns, max_reg_num (), 0);
3038 timevar_pop (TV_JUMP);
3039 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3043 timevar_push (TV_TRACER);
3044 open_dump_file (DFI_tracer, decl);
3046 dump_flow_info (rtl_dump_file);
3048 cleanup_cfg (CLEANUP_EXPENSIVE);
3049 reg_scan (insns, max_reg_num (), 0);
3050 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3051 timevar_pop (TV_TRACER);
3054 if (flag_rerun_cse_after_loop)
3056 timevar_push (TV_CSE2);
3057 open_dump_file (DFI_cse2, decl);
3059 dump_flow_info (rtl_dump_file);
3060 /* CFG is no longer maintained up-to-date. */
3061 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3062 purge_all_dead_edges (0);
3063 delete_trivially_dead_insns (insns, max_reg_num ());
3067 timevar_push (TV_JUMP);
3068 rebuild_jump_labels (insns);
3069 cleanup_cfg (CLEANUP_EXPENSIVE);
3070 timevar_pop (TV_JUMP);
3072 reg_scan (insns, max_reg_num (), 0);
3073 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3075 timevar_pop (TV_CSE2);
3078 cse_not_expected = 1;
3080 open_dump_file (DFI_life, decl);
3083 #ifdef ENABLE_CHECKING
3084 verify_flow_info ();
3086 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3088 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3089 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3090 timevar_pop (TV_FLOW);
3092 if (warn_uninitialized || extra_warnings)
3094 uninitialized_vars_warning (DECL_INITIAL (decl));
3096 setjmp_args_warning ();
3101 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3103 /* Insns were inserted, and possibly pseudos created, so
3104 things might look a bit different. */
3105 insns = get_insns ();
3106 allocate_reg_life_data ();
3107 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3108 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
3114 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3118 /* If -opt, try combining insns through substitution. */
3122 int rebuild_jump_labels_after_combine = 0;
3124 timevar_push (TV_COMBINE);
3125 open_dump_file (DFI_combine, decl);
3127 rebuild_jump_labels_after_combine
3128 = combine_instructions (insns, max_reg_num ());
3130 /* Combining insns may have turned an indirect jump into a
3131 direct jump. Rebuid the JUMP_LABEL fields of jumping
3133 if (rebuild_jump_labels_after_combine)
3135 timevar_push (TV_JUMP);
3136 rebuild_jump_labels (insns);
3137 timevar_pop (TV_JUMP);
3139 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3142 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3143 timevar_pop (TV_COMBINE);
3148 /* Rerun if-conversion, as combine may have simplified things enough to
3149 now meet sequence length restrictions. */
3150 if (flag_if_conversion)
3152 timevar_push (TV_IFCVT);
3153 open_dump_file (DFI_ce2, decl);
3159 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3160 timevar_pop (TV_IFCVT);
3163 /* Register allocation pre-pass, to reduce number of moves
3164 necessary for two-address machines. */
3165 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3167 timevar_push (TV_REGMOVE);
3168 open_dump_file (DFI_regmove, decl);
3170 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3172 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3173 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3174 timevar_pop (TV_REGMOVE);
3179 /* Do unconditional splitting before register allocation to allow machine
3180 description to add extra information not needed previously. */
3181 split_all_insns (1);
3183 /* Any of the several passes since flow1 will have munged register
3184 lifetime data a bit. */
3185 register_life_up_to_date = 0;
3187 #ifdef OPTIMIZE_MODE_SWITCHING
3188 timevar_push (TV_MODE_SWITCH);
3191 optimize_mode_switching (NULL);
3194 timevar_pop (TV_MODE_SWITCH);
3197 timevar_push (TV_SCHED);
3199 #ifdef INSN_SCHEDULING
3201 /* Print function header into sched dump now
3202 because doing the sched analysis makes some of the dump. */
3203 if (optimize > 0 && flag_schedule_insns)
3205 open_dump_file (DFI_sched, decl);
3207 /* Do control and data sched analysis,
3208 and write some of the results to dump file. */
3210 schedule_insns (rtl_dump_file);
3212 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3214 /* Register lifetime information was updated as part of verifying
3216 register_life_up_to_date = 1;
3219 timevar_pop (TV_SCHED);
3223 /* Determine if the current function is a leaf before running reload
3224 since this can impact optimizations done by the prologue and
3225 epilogue thus changing register elimination offsets. */
3226 current_function_is_leaf = leaf_function_p ();
3228 timevar_push (TV_LOCAL_ALLOC);
3229 open_dump_file (DFI_lreg, decl);
3231 /* Allocate pseudo-regs that are used only within 1 basic block.
3233 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3234 jump optimizer after register allocation and reloading are finished. */
3236 if (! register_life_up_to_date)
3237 recompute_reg_usage (insns, ! optimize_size);
3239 if (flag_new_regalloc)
3241 delete_trivially_dead_insns (insns, max_reg_num ());
3244 timevar_pop (TV_LOCAL_ALLOC);
3245 if (dump_file[DFI_lreg].enabled)
3247 timevar_push (TV_DUMP);
3249 close_dump_file (DFI_lreg, NULL, NULL);
3250 timevar_pop (TV_DUMP);
3253 /* XXX clean up the whole mess to bring live info in shape again. */
3254 timevar_push (TV_GLOBAL_ALLOC);
3255 open_dump_file (DFI_greg, decl);
3257 build_insn_chain (insns);
3258 failure = reload (insns, 0);
3260 timevar_pop (TV_GLOBAL_ALLOC);
3262 if (dump_file[DFI_greg].enabled)
3264 timevar_push (TV_DUMP);
3266 dump_global_regs (rtl_dump_file);
3268 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3269 timevar_pop (TV_DUMP);
3273 goto exit_rest_of_compilation;
3274 reload_completed = 1;
3275 rebuild_label_notes_after_reload = 0;
3279 /* Allocate the reg_renumber array. */
3280 allocate_reg_info (max_regno, FALSE, TRUE);
3282 /* And the reg_equiv_memory_loc array. */
3283 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3285 allocate_initial_values (reg_equiv_memory_loc);
3287 regclass (insns, max_reg_num (), rtl_dump_file);
3288 rebuild_label_notes_after_reload = local_alloc ();
3290 timevar_pop (TV_LOCAL_ALLOC);
3292 if (dump_file[DFI_lreg].enabled)
3294 timevar_push (TV_DUMP);
3296 dump_flow_info (rtl_dump_file);
3297 dump_local_alloc (rtl_dump_file);
3299 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3300 timevar_pop (TV_DUMP);
3305 timevar_push (TV_GLOBAL_ALLOC);
3306 open_dump_file (DFI_greg, decl);
3308 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3309 pass fixing up any insns that are invalid. */
3312 failure = global_alloc (rtl_dump_file);
3315 build_insn_chain (insns);
3316 failure = reload (insns, 0);
3319 timevar_pop (TV_GLOBAL_ALLOC);
3321 if (dump_file[DFI_greg].enabled)
3323 timevar_push (TV_DUMP);
3325 dump_global_regs (rtl_dump_file);
3327 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3328 timevar_pop (TV_DUMP);
3332 goto exit_rest_of_compilation;
3337 open_dump_file (DFI_postreload, decl);
3339 /* Do a very simple CSE pass over just the hard registers. */
3342 timevar_push (TV_RELOAD_CSE_REGS);
3343 reload_cse_regs (insns);
3344 timevar_pop (TV_RELOAD_CSE_REGS);
3347 /* Register allocation and reloading may have turned an indirect jump into
3348 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3349 jumping instructions. */
3350 if (rebuild_label_notes_after_reload)
3352 timevar_push (TV_JUMP);
3354 rebuild_jump_labels (insns);
3355 purge_all_dead_edges (0);
3357 timevar_pop (TV_JUMP);
3360 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3362 /* Re-create the death notes which were deleted during reload. */
3363 timevar_push (TV_FLOW2);
3364 open_dump_file (DFI_flow2, decl);
3366 #ifdef ENABLE_CHECKING
3367 verify_flow_info ();
3370 /* If optimizing, then go ahead and split insns now. */
3374 split_all_insns (0);
3377 cleanup_cfg (CLEANUP_EXPENSIVE);
3379 /* On some machines, the prologue and epilogue code, or parts thereof,
3380 can be represented as RTL. Doing so lets us schedule insns between
3381 it and the rest of the code and also allows delayed branch
3382 scheduling to operate in the epilogue. */
3383 thread_prologue_and_epilogue_insns (insns);
3387 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3388 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3389 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3391 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3392 even for machines with possibly nonzero RETURN_POPS_ARGS
3393 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3394 push instructions will have popping returns. */
3395 #ifndef PUSH_ROUNDING
3396 if (!ACCUMULATE_OUTGOING_ARGS)
3398 combine_stack_adjustments ();
3403 flow2_completed = 1;
3405 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3406 timevar_pop (TV_FLOW2);
3408 #ifdef HAVE_peephole2
3409 if (optimize > 0 && flag_peephole2)
3411 timevar_push (TV_PEEPHOLE2);
3412 open_dump_file (DFI_peephole2, decl);
3414 peephole2_optimize (rtl_dump_file);
3416 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3417 timevar_pop (TV_PEEPHOLE2);
3421 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3423 timevar_push (TV_RENAME_REGISTERS);
3424 open_dump_file (DFI_rnreg, decl);
3426 if (flag_rename_registers)
3427 regrename_optimize ();
3428 if (flag_cprop_registers)
3429 copyprop_hardreg_forward ();
3431 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3432 timevar_pop (TV_RENAME_REGISTERS);
3435 if (flag_if_conversion2)
3437 timevar_push (TV_IFCVT2);
3438 open_dump_file (DFI_ce3, decl);
3442 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3443 timevar_pop (TV_IFCVT2);
3446 #ifdef INSN_SCHEDULING
3447 if (optimize > 0 && flag_schedule_insns_after_reload)
3449 timevar_push (TV_SCHED2);
3450 open_dump_file (DFI_sched2, decl);
3452 /* Do control and data sched analysis again,
3453 and write some more of the results to dump file. */
3455 split_all_insns (1);
3457 schedule_insns (rtl_dump_file);
3459 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3460 timevar_pop (TV_SCHED2);
3466 #ifdef LEAF_REGISTERS
3467 current_function_uses_only_leaf_regs
3468 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3472 #if defined (HAVE_ATTR_length)
3473 /* If flow2 creates new instructions which need splitting
3474 and scheduling after reload is not done, they might not be
3475 splitten until final which doesn't allow splitting
3476 if HAVE_ATTR_length. */
3477 #ifdef INSN_SCHEDULING
3478 if (optimize && !flag_schedule_insns_after_reload)
3483 timevar_push (TV_SHORTEN_BRANCH);
3484 split_all_insns (1);
3485 timevar_pop (TV_SHORTEN_BRANCH);
3489 timevar_push (TV_REG_STACK);
3490 open_dump_file (DFI_stack, decl);
3492 reg_to_stack (insns, rtl_dump_file);
3494 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3495 timevar_pop (TV_REG_STACK);
3501 timevar_push (TV_REORDER_BLOCKS);
3502 open_dump_file (DFI_bbro, decl);
3504 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3505 splitting possibly introduced more crossjumping oppurtuntities.
3506 Except that we can't actually run crossjumping without running
3507 another DCE pass, which we can't do after reg-stack. */
3508 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3509 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3510 if (flag_reorder_blocks)
3512 reorder_basic_blocks ();
3513 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3516 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3517 timevar_pop (TV_REORDER_BLOCKS);
3519 compute_alignments ();
3521 /* CFG is no longer maintained up-to-date. */
3522 free_bb_for_insn ();
3524 /* If a machine dependent reorganization is needed, call it. */
3525 #ifdef MACHINE_DEPENDENT_REORG
3526 timevar_push (TV_MACH_DEP);
3527 open_dump_file (DFI_mach, decl);
3529 MACHINE_DEPENDENT_REORG (insns);
3531 close_dump_file (DFI_mach, print_rtl, insns);
3532 timevar_pop (TV_MACH_DEP);
3537 purge_line_number_notes (insns);
3538 cleanup_barriers ();
3540 /* If a scheduling pass for delayed branches is to be done,
3541 call the scheduling code. */
3544 if (optimize > 0 && flag_delayed_branch)
3546 timevar_push (TV_DBR_SCHED);
3547 open_dump_file (DFI_dbr, decl);
3549 dbr_schedule (insns, rtl_dump_file);
3551 close_dump_file (DFI_dbr, print_rtl, insns);
3552 timevar_pop (TV_DBR_SCHED);
3558 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3559 timevar_push (TV_SHORTEN_BRANCH);
3560 split_all_insns_noflow ();
3561 timevar_pop (TV_SHORTEN_BRANCH);
3564 convert_to_eh_region_ranges ();
3566 /* Shorten branches. */
3567 timevar_push (TV_SHORTEN_BRANCH);
3568 shorten_branches (get_insns ());
3569 timevar_pop (TV_SHORTEN_BRANCH);
3571 set_nothrow_function_flags ();
3572 if (current_function_nothrow)
3573 /* Now we know that this can't throw; set the flag for the benefit
3574 of other functions later in this translation unit. */
3575 TREE_NOTHROW (current_function_decl) = 1;
3577 /* Now turn the rtl into assembler code. */
3579 timevar_push (TV_FINAL);
3584 /* Get the function's name, as described by its RTL. This may be
3585 different from the DECL_NAME name used in the source file. */
3587 x = DECL_RTL (decl);
3588 if (GET_CODE (x) != MEM)
3591 if (GET_CODE (x) != SYMBOL_REF)
3593 fnname = XSTR (x, 0);
3595 assemble_start_function (decl, fnname);
3596 final_start_function (insns, asm_out_file, optimize);
3597 final (insns, asm_out_file, optimize, 0);
3598 final_end_function ();
3600 #ifdef IA64_UNWIND_INFO
3601 /* ??? The IA-64 ".handlerdata" directive must be issued before
3602 the ".endp" directive that closes the procedure descriptor. */
3603 output_function_exception_table ();
3606 assemble_end_function (decl, fnname);
3608 #ifndef IA64_UNWIND_INFO
3609 /* Otherwise, it feels unclean to switch sections in the middle. */
3610 output_function_exception_table ();
3614 fflush (asm_out_file);
3616 /* Release all memory allocated by flow. */
3617 free_basic_block_vars (0);
3619 /* Release all memory held by regsets now. */
3620 regset_release_memory ();
3622 timevar_pop (TV_FINAL);
3626 /* Write DBX symbols if requested. */
3628 /* Note that for those inline functions where we don't initially
3629 know for certain that we will be generating an out-of-line copy,
3630 the first invocation of this routine (rest_of_compilation) will
3631 skip over this code by doing a `goto exit_rest_of_compilation;'.
3632 Later on, wrapup_global_declarations will (indirectly) call
3633 rest_of_compilation again for those inline functions that need
3634 to have out-of-line copies generated. During that call, we
3635 *will* be routed past here. */
3637 timevar_push (TV_SYMOUT);
3638 (*debug_hooks->function_decl) (decl);
3639 timevar_pop (TV_SYMOUT);
3641 exit_rest_of_compilation:
3643 /* In case the function was not output,
3644 don't leave any temporary anonymous types
3645 queued up for sdb output. */
3646 #ifdef SDB_DEBUGGING_INFO
3647 if (write_symbols == SDB_DEBUG)
3648 sdbout_types (NULL_TREE);
3651 reload_completed = 0;
3652 flow2_completed = 0;
3655 timevar_push (TV_FINAL);
3657 /* Clear out the insn_length contents now that they are no
3659 init_insn_lengths ();
3661 /* Show no temporary slots allocated. */
3664 free_basic_block_vars (0);
3665 free_bb_for_insn ();
3667 timevar_pop (TV_FINAL);
3669 /* Make sure volatile mem refs aren't considered valid operands for
3670 arithmetic insns. We must call this here if this is a nested inline
3671 function, since the above code leaves us in the init_recog state
3672 (from final.c), and the function context push/pop code does not
3673 save/restore volatile_ok.
3675 ??? Maybe it isn't necessary for expand_start_function to call this
3676 anymore if we do it here? */
3678 init_recog_no_volatile ();
3680 /* We're done with this function. Free up memory if we can. */
3681 free_after_parsing (cfun);
3682 if (! DECL_DEFER_OUTPUT (decl))
3684 free_after_compilation (cfun);
3686 /* Clear integrate.c's pointer to the cfun structure we just
3688 DECL_SAVED_INSNS (decl) = 0;
3694 timevar_pop (TV_REST_OF_COMPILATION);
3704 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3705 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3706 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3707 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3708 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3709 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"));
3710 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3711 printf (_(" -fstack-limit-register=<register> Trap if the stack goes past <register>\n"));
3712 printf (_(" -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>\n"));
3713 printf (_(" -frandom-seed=<string> Make compile reproducible using <string>\n"));
3716 for (i = ARRAY_SIZE (f_options); i--;)
3718 const char *description = f_options[i].description;
3720 if (description != NULL && *description != 0)
3721 printf (" -f%-21s %s\n",
3722 f_options[i].string, _(description));
3725 printf (_(" -O[number] Set optimization level to [number]\n"));
3726 printf (_(" -Os Optimize for space rather than speed\n"));
3727 for (i = LAST_PARAM; i--;)
3729 const char *description = compiler_params[i].help;
3730 const int length = 21 - strlen (compiler_params[i].option);
3732 if (description != NULL && *description != 0)
3733 printf (" --param %s=<value>%.*s%s\n",
3734 compiler_params[i].option,
3735 length > 0 ? length : 1, " ",
3738 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3739 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3740 printf (_(" -w Suppress warnings\n"));
3741 printf (_(" -W Enable extra warnings\n"));
3743 for (i = ARRAY_SIZE (W_options); i--;)
3745 const char *description = W_options[i].description;
3747 if (description != NULL && *description != 0)
3748 printf (" -W%-21s %s\n",
3749 W_options[i].string, _(description));
3752 printf (_(" -Wunused Enable unused warnings\n"));
3753 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3754 printf (_(" -p Enable function profiling\n"));
3755 printf (_(" -o <file> Place output into <file> \n"));
3757 -G <number> Put global and static data smaller than <number>\n\
3758 bytes into a special section (on some targets)\n"));
3760 for (i = ARRAY_SIZE (debug_args); i--;)
3762 if (debug_args[i].description != NULL)
3763 printf (" -g%-21s %s\n",
3764 debug_args[i].arg, _(debug_args[i].description));
3767 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3768 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3769 printf (_(" -version Display the compiler's version\n"));
3770 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3771 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3772 #if defined INSN_SCHEDULING
3773 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3775 printf (_(" --help Display this information\n"));
3780 /* Display descriptions of language specific options.
3781 If there is no description, note that there is an undocumented option.
3782 If the description is empty, do not display anything. (This allows
3783 options to be deliberately undocumented, for whatever reason).
3784 If the option string is missing, then this is a marker, indicating
3785 that the description string is in fact the name of a language, whose
3786 language specific options are to follow. */
3788 if (ARRAY_SIZE (documented_lang_options) > 1)
3790 printf (_("\nLanguage specific options:\n"));
3792 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3794 const char *description = documented_lang_options[i].description;
3795 const char *option = documented_lang_options[i].option;
3797 if (description == NULL)
3802 printf (_(" %-23.23s [undocumented]\n"), option);
3804 else if (*description == 0)
3806 else if (option == NULL)
3810 (_("\nThere are undocumented %s specific options as well.\n"),
3814 printf (_("\n Options for %s:\n"), description);
3819 printf (" %-23.23s %s\n", option, _(description));
3824 printf (_("\nThere are undocumented %s specific options as well.\n"),
3827 display_target_options ();
3831 display_target_options ()
3834 static bool displayed = false;
3836 /* Avoid double printing for --help --target-help. */
3841 if (ARRAY_SIZE (target_switches) > 1
3842 #ifdef TARGET_OPTIONS
3843 || ARRAY_SIZE (target_options) > 1
3851 printf (_("\nTarget specific options:\n"));
3853 for (i = ARRAY_SIZE (target_switches); i--;)
3855 const char *option = target_switches[i].name;
3856 const char *description = target_switches[i].description;
3858 if (option == NULL || *option == 0)
3860 else if (description == NULL)
3865 printf (_(" -m%-23.23s [undocumented]\n"), option);
3867 else if (*description != 0)
3868 doc += printf (" -m%-23.23s %s\n", option, _(description));
3871 #ifdef TARGET_OPTIONS
3872 for (i = ARRAY_SIZE (target_options); i--;)
3874 const char *option = target_options[i].prefix;
3875 const char *description = target_options[i].description;
3877 if (option == NULL || *option == 0)
3879 else if (description == NULL)
3884 printf (_(" -m%-23.23s [undocumented]\n"), option);
3886 else if (*description != 0)
3887 doc += printf (" -m%-23.23s %s\n", option, _(description));
3893 printf (_("\nThere are undocumented target specific options as well.\n"));
3895 printf (_(" They exist, but they are not documented.\n"));
3900 /* Parse a -d... command line switch. */
3903 decode_d_option (arg)
3912 for (i = 0; i < (int) DFI_MAX; ++i)
3913 dump_file[i].enabled = 1;
3919 flag_print_asm_name = 1;
3922 flag_dump_rtl_in_asm = 1;
3923 flag_print_asm_name = 1;
3926 graph_dump_format = vcg;
3929 rtl_dump_and_exit = 1;
3934 case 'D': /* These are handled by the preprocessor. */
3940 for (i = 0; i < (int) DFI_MAX; ++i)
3941 if (c == dump_file[i].debug_switch)
3943 dump_file[i].enabled = 1;
3948 warning ("unrecognized gcc debugging option: %c", c);
3953 /* Parse a -f... command line switch. ARG is the value after the -f.
3954 It is safe to access 'ARG - 2' to generate the full switch name.
3955 Return the number of strings consumed. */
3958 decode_f_option (arg)
3962 const char *option_value = NULL;
3964 /* Search for the option in the table of binary f options. */
3965 for (j = ARRAY_SIZE (f_options); j--;)
3967 if (!strcmp (arg, f_options[j].string))
3969 *f_options[j].variable = f_options[j].on_value;
3973 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3974 && ! strcmp (arg + 3, f_options[j].string))
3976 *f_options[j].variable = ! f_options[j].on_value;
3981 if (!strcmp (arg, "fast-math"))
3982 set_fast_math_flags (1);
3983 else if (!strcmp (arg, "no-fast-math"))
3984 set_fast_math_flags (0);
3985 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3986 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3989 read_integral_parameter (option_value, arg - 2,
3991 set_param_value ("max-inline-insns", val);
3992 set_param_value ("max-inline-insns-single", val/2);
3993 set_param_value ("max-inline-insns-auto", val/2);
3994 set_param_value ("max-inline-insns-rtl", val);
3995 if (val/4 < MIN_INLINE_INSNS)
3998 set_param_value ("min-inline-insns", val/4);
4000 set_param_value ("min-inline-insns", 10);
4003 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4005 if (strcmp (option_value, "global-dynamic") == 0)
4006 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4007 else if (strcmp (option_value, "local-dynamic") == 0)
4008 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4009 else if (strcmp (option_value, "initial-exec") == 0)
4010 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4011 else if (strcmp (option_value, "local-exec") == 0)
4012 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4014 warning ("`%s': unknown tls-model option", arg - 2);
4016 #ifdef INSN_SCHEDULING
4017 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4018 fix_sched_param ("verbose", option_value);
4020 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4021 fix_register (option_value, 1, 1);
4022 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4023 fix_register (option_value, 0, 1);
4024 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4025 fix_register (option_value, 0, 0);
4026 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4027 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4028 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4030 = read_integral_parameter (option_value, arg - 2, align_functions);
4031 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4032 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4033 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4035 = read_integral_parameter (option_value, arg - 2, align_labels);
4036 else if ((option_value
4037 = skip_leading_substring (arg, "stack-limit-register=")))
4039 int reg = decode_reg_name (option_value);
4041 error ("unrecognized register name `%s'", option_value);
4043 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4045 else if ((option_value
4046 = skip_leading_substring (arg, "stack-limit-symbol=")))
4049 nm = ggc_strdup (option_value);
4050 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4052 else if ((option_value
4053 = skip_leading_substring (arg, "message-length=")))
4054 output_set_maximum_length
4055 (&global_dc->buffer, read_integral_parameter
4056 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4057 else if ((option_value
4058 = skip_leading_substring (arg, "diagnostics-show-location=")))
4060 if (!strcmp (option_value, "once"))
4061 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4062 else if (!strcmp (option_value, "every-line"))
4063 diagnostic_prefixing_rule (global_dc)
4064 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4066 error ("unrecognized option `%s'", arg - 2);
4068 else if (!strcmp (arg, "no-stack-limit"))
4069 stack_limit_rtx = NULL_RTX;
4070 else if ((option_value = skip_leading_substring (arg, "random-seed=")))
4071 flag_random_seed = option_value;
4072 else if (!strcmp (arg, "no-random-seed"))
4073 flag_random_seed = NULL;
4074 else if (!strcmp (arg, "preprocessed"))
4075 /* Recognize this switch but do nothing. This prevents warnings
4076 about an unrecognized switch if cpplib has not been linked in. */
4084 /* Parse a -W... command line switch. ARG is the value after the -W.
4085 It is safe to access 'ARG - 2' to generate the full switch name.
4086 Return the number of strings consumed. */
4089 decode_W_option (arg)
4092 const char *option_value = NULL;
4095 /* Search for the option in the table of binary W options. */
4097 for (j = ARRAY_SIZE (W_options); j--;)
4099 if (!strcmp (arg, W_options[j].string))
4101 *W_options[j].variable = W_options[j].on_value;
4105 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4106 && ! strcmp (arg + 3, W_options[j].string))
4108 *W_options[j].variable = ! W_options[j].on_value;
4113 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4114 warning ("-Wid-clash-LEN is no longer supported");
4115 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4117 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4119 warn_larger_than = larger_than_size != -1;
4121 else if (!strcmp (arg, "unused"))
4125 else if (!strcmp (arg, "no-unused"))
4135 /* Parse a -g... command line switch. ARG is the value after the -g.
4136 It is safe to access 'ARG - 2' to generate the full switch name.
4137 Return the number of strings consumed. */
4140 decode_g_option (arg)
4143 static unsigned level = 0;
4144 /* A lot of code assumes write_symbols == NO_DEBUG if the
4145 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4146 of what debugging type has been selected). This records the
4147 selected type. It is an error to specify more than one
4149 static enum debug_info_type selected_debug_type = NO_DEBUG;
4150 /* Non-zero if debugging format has been explicitly set.
4151 -g and -ggdb don't explicitly set the debugging format so
4152 -gdwarf -g3 is equivalent to -gdwarf3. */
4153 static int type_explicitly_set_p = 0;
4154 /* Indexed by enum debug_info_type. */
4155 static const char *const debug_type_names[] =
4157 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4160 /* The maximum admissible debug level value. */
4161 static const unsigned max_debug_level = 3;
4163 /* Look up ARG in the table. */
4164 for (da = debug_args; da->arg; da++)
4166 const int da_len = strlen (da->arg);
4168 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4170 enum debug_info_type type = da->debug_type;
4171 const char *p = arg + da_len;
4173 if (*p && ! ISDIGIT (*p))
4176 /* A debug flag without a level defaults to level 2.
4177 Note we do not want to call read_integral_parameter
4178 for that case since it will call atoi which
4181 ??? We may want to generalize the interface to
4182 read_integral_parameter to better handle this case
4183 if this case shows up often. */
4185 level = read_integral_parameter (p, 0, max_debug_level + 1);
4187 level = (level == 0) ? 2 : level;
4189 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4191 error ("use -gdwarf -g%d for DWARF v1, level %d",
4194 error ("use -gdwarf-2 for DWARF v2");
4197 if (level > max_debug_level)
4200 ignoring option `%s' due to invalid debug level specification",
4202 level = debug_info_level;
4205 if (type == NO_DEBUG)
4207 type = PREFERRED_DEBUGGING_TYPE;
4209 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4211 #ifdef DWARF2_DEBUGGING_INFO
4212 type = DWARF2_DEBUG;
4214 #ifdef DBX_DEBUGGING_INFO
4221 if (type == NO_DEBUG)
4222 warning ("`%s': unknown or unsupported -g option", arg - 2);
4224 /* Does it conflict with an already selected type? */
4225 if (type_explicitly_set_p
4226 /* -g/-ggdb don't conflict with anything. */
4227 && da->debug_type != NO_DEBUG
4228 && type != selected_debug_type)
4229 warning ("`%s' ignored, conflicts with `-g%s'",
4230 arg - 2, debug_type_names[(int) selected_debug_type]);
4233 /* If the format has already been set, -g/-ggdb
4234 only change the debug level. */
4235 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4236 /* Don't change debugging type. */
4240 selected_debug_type = type;
4241 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4244 write_symbols = (level == 0
4246 : selected_debug_type);
4247 use_gnu_debug_info_extensions = da->use_extensions_p;
4248 debug_info_level = (enum debug_info_level) level;
4261 /* Decode the first argument in the argv as a language-independent option.
4262 Return the number of strings consumed. */
4265 independent_decode_option (argc, argv)
4269 char *arg = argv[0];
4271 if (arg[0] != '-' || arg[1] == 0)
4283 if (!strcmp (arg, "-help"))
4286 exit_after_options = 1;
4290 if (!strcmp (arg, "-target-help"))
4292 display_target_options ();
4293 exit_after_options = 1;
4297 if (!strcmp (arg, "-version"))
4299 print_version (stderr, "");
4300 exit_after_options = 1;
4304 /* Handle '--param <name>=<value>'. */
4305 if (strcmp (arg, "-param") == 0)
4311 error ("-param option missing argument");
4315 /* Get the '<name>=<value>' parameter. */
4317 /* Look for the `='. */
4318 equal = strchr (arg, '=');
4320 error ("invalid --param option: %s", arg);
4325 /* Zero out the `=' sign so that we get two separate strings. */
4327 /* Figure out what value is specified. */
4328 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4329 if (val != INVALID_PARAM_VAL)
4330 set_param_value (arg, val);
4332 error ("invalid parameter value `%s'", equal + 1);
4347 /* Already been treated in main (). Do nothing. */
4351 set_target_switch (arg + 1);
4355 return decode_f_option (arg + 1);
4358 return decode_g_option (arg + 1);
4361 if (!strcmp (arg, "dumpbase"))
4367 dump_base_name = argv[1];
4372 decode_d_option (arg + 1);
4376 if (!strcmp (arg, "pedantic"))
4378 else if (!strcmp (arg, "pedantic-errors"))
4379 flag_pedantic_errors = pedantic = 1;
4380 else if (arg[1] == 0)
4387 if (!strcmp (arg, "quiet"))
4394 if (!strcmp (arg, "version"))
4402 inhibit_warnings = 1;
4411 /* We save the value of warn_uninitialized, since if they put
4412 -Wuninitialized on the command line, we need to generate a
4413 warning about not using it without also specifying -O. */
4414 if (warn_uninitialized != 1)
4415 warn_uninitialized = 2;
4418 return decode_W_option (arg + 1);
4422 if (!strncmp (arg, "aux-info", 8))
4429 aux_info_file_name = argv[1];
4430 flag_gen_aux_info = 1;
4433 else if (arg[8] == '=')
4435 aux_info_file_name = arg + 9;
4436 flag_gen_aux_info = 1;
4441 else if (!strcmp (arg, "auxbase"))
4447 aux_base_name = argv[1];
4451 else if (!strcmp (arg, "auxbase-strip"))
4458 strip_off_ending (argv[1], strlen (argv[1]));
4460 aux_base_name = argv[1];
4475 asm_file_name = argv[1];
4490 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4495 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4499 if (g_switch_val == -1)
4503 g_switch_set = TRUE;
4504 g_switch_value = g_switch_val;
4514 /* Decode -m switches. */
4515 /* Decode the switch -mNAME. */
4518 set_target_switch (name)
4522 int valid_target_option = 0;
4524 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4525 if (!strcmp (target_switches[j].name, name))
4527 if (target_switches[j].value < 0)
4528 target_flags &= ~-target_switches[j].value;
4530 target_flags |= target_switches[j].value;
4533 if (target_switches[j].value < 0)
4534 target_flags_explicit |= -target_switches[j].value;
4536 target_flags_explicit |= target_switches[j].value;
4538 valid_target_option = 1;
4541 #ifdef TARGET_OPTIONS
4542 if (!valid_target_option)
4543 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4545 int len = strlen (target_options[j].prefix);
4546 if (!strncmp (target_options[j].prefix, name, len))
4548 *target_options[j].variable = name + len;
4549 valid_target_option = 1;
4554 if (!valid_target_option)
4555 error ("invalid option `%s'", name);
4558 /* Print version information to FILE.
4559 Each line begins with INDENT (for the case where FILE is the
4560 assembler output file). */
4563 print_version (file, indent)
4568 #define __VERSION__ "[?]"
4572 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4574 "%s%s%s version %s (%s) compiled by CC.\n"
4576 , indent, *indent != 0 ? " " : "",
4577 lang_hooks.name, version_string, TARGET_NAME,
4578 indent, __VERSION__);
4579 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4580 indent, *indent != 0 ? " " : "",
4581 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4584 /* Print an option value and return the adjusted position in the line.
4585 ??? We don't handle error returns from fprintf (disk full); presumably
4586 other code will catch a disk full though. */
4589 print_single_switch (file, pos, max, indent, sep, term, type, name)
4592 const char *indent, *sep, *term, *type, *name;
4594 /* The ultrix fprintf returns 0 on success, so compute the result we want
4595 here since we need it for the following test. */
4596 int len = strlen (sep) + strlen (type) + strlen (name);
4601 fprintf (file, "%s", term);
4606 fprintf (file, "%s", indent);
4607 pos = strlen (indent);
4609 fprintf (file, "%s%s%s", sep, type, name);
4614 /* Print active target switches to FILE.
4615 POS is the current cursor position and MAX is the size of a "line".
4616 Each line begins with INDENT and ends with TERM.
4617 Each switch is separated from the next by SEP. */
4620 print_switch_values (file, pos, max, indent, sep, term)
4623 const char *indent, *sep, *term;
4628 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4629 that it can be printed below. This helps reproducibility. Of
4630 course, the string may never be used, but we can't tell that at
4631 this point in the compile. */
4632 default_flag_random_seed ();
4634 /* Print the options as passed. */
4636 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4637 _("options passed: "), "");
4639 for (p = &save_argv[1]; *p != NULL; p++)
4643 if (strcmp (*p, "-o") == 0)
4649 if (strcmp (*p, "-quiet") == 0)
4651 if (strcmp (*p, "-version") == 0)
4656 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4659 fprintf (file, "%s", term);
4661 /* Print the -f and -m options that have been enabled.
4662 We don't handle language specific options but printing argv
4665 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4666 _("options enabled: "), "");
4668 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4669 if (*f_options[j].variable == f_options[j].on_value)
4670 pos = print_single_switch (file, pos, max, indent, sep, term,
4671 "-f", f_options[j].string);
4673 /* Print target specific options. */
4675 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4676 if (target_switches[j].name[0] != '\0'
4677 && target_switches[j].value > 0
4678 && ((target_switches[j].value & target_flags)
4679 == target_switches[j].value))
4681 pos = print_single_switch (file, pos, max, indent, sep, term,
4682 "-m", target_switches[j].name);
4685 #ifdef TARGET_OPTIONS
4686 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4687 if (*target_options[j].variable != NULL)
4690 sprintf (prefix, "-m%s", target_options[j].prefix);
4691 pos = print_single_switch (file, pos, max, indent, sep, term,
4692 prefix, *target_options[j].variable);
4696 fprintf (file, "%s", term);
4699 /* Open assembly code output file. Do this even if -fsyntax-only is
4700 on, because then the driver will have provided the name of a
4701 temporary file or bit bucket for us. NAME is the file specified on
4702 the command line, possibly NULL. */
4704 init_asm_output (name)
4707 if (name == NULL && asm_file_name == 0)
4708 asm_out_file = stdout;
4711 if (asm_file_name == 0)
4713 int len = strlen (dump_base_name);
4714 char *dumpname = (char *) xmalloc (len + 6);
4715 memcpy (dumpname, dump_base_name, len + 1);
4716 strip_off_ending (dumpname, len);
4717 strcat (dumpname, ".s");
4718 asm_file_name = dumpname;
4720 if (!strcmp (asm_file_name, "-"))
4721 asm_out_file = stdout;
4723 asm_out_file = fopen (asm_file_name, "w");
4724 if (asm_out_file == 0)
4725 fatal_io_error ("can't open %s for writing", asm_file_name);
4728 #ifdef IO_BUFFER_SIZE
4729 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4730 _IOFBF, IO_BUFFER_SIZE);
4733 if (!flag_syntax_only)
4735 #ifdef ASM_FILE_START
4736 ASM_FILE_START (asm_out_file);
4739 #ifdef ASM_COMMENT_START
4740 if (flag_verbose_asm)
4742 /* Print the list of options in effect. */
4743 print_version (asm_out_file, ASM_COMMENT_START);
4744 print_switch_values (asm_out_file, 0, MAX_LINE,
4745 ASM_COMMENT_START, " ", "\n");
4746 /* Add a blank line here so it appears in assembler output but not
4748 fprintf (asm_out_file, "\n");
4754 /* Initialization of the front end environment, before command line
4755 options are parsed. Signal handlers, internationalization etc.
4756 ARGV0 is main's argv[0]. */
4758 general_init (argv0)
4763 p = argv0 + strlen (argv0);
4764 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4768 xmalloc_set_program_name (progname);
4772 gcc_init_libintl ();
4774 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4776 signal (SIGSEGV, crash_signal);
4779 signal (SIGILL, crash_signal);
4782 signal (SIGBUS, crash_signal);
4785 signal (SIGABRT, crash_signal);
4787 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4788 signal (SIGIOT, crash_signal);
4791 signal (SIGFPE, crash_signal);
4794 /* Initialize the diagnostics reporting machinery, so option parsing
4795 can give warnings and errors. */
4796 diagnostic_initialize (global_dc);
4798 /* Initialize the garbage-collector, string pools and tree type hash
4805 /* Parse command line options and set default flag values, called
4806 after language-independent option-independent initialization. Do
4807 minimal options processing. Outputting diagnostics is OK, but GC
4808 and identifier hashtables etc. are not initialized yet.
4810 Return nonzero to suppress compiler back end initialization. */
4812 parse_options_and_default_flags (argc, argv)
4818 /* Save in case md file wants to emit args as a comment. */
4822 /* Initialize register usage now so switches may override. */
4825 /* Register the language-independent parameters. */
4826 add_params (lang_independent_params, LAST_PARAM);
4828 /* This must be done after add_params but before argument processing. */
4829 init_ggc_heuristics();
4831 /* Perform language-specific options initialization. */
4832 (*lang_hooks.init_options) ();
4834 /* Scan to see what optimization level has been specified. That will
4835 determine the default value of many flags. */
4836 for (i = 1; i < argc; i++)
4838 if (!strcmp (argv[i], "-O"))
4843 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4845 /* Handle -Os, -O2, -O3, -O69, ... */
4846 char *p = &argv[i][2];
4848 if ((p[0] == 's') && (p[1] == 0))
4852 /* Optimizing for size forces optimize to be 2. */
4857 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4858 if (optimize_val != -1)
4860 optimize = optimize_val;
4862 #ifdef FORCE_OPTIMIZATION_DOWNGRADE
4863 #warning FORCE_OPTIMIZATION_DOWNGRADE
4864 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE)
4866 optimize = FORCE_OPTIMIZATION_DOWNGRADE;
4867 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***",
4869 FORCE_OPTIMIZATION_DOWNGRADE);
4872 #endif /*FORCE_OPTIMIZATION_DOWNGRADE*/
4874 #if defined(TRY_WITHOUT_THIS__alpha__)
4877 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***",
4880 #endif /*__alpha__*/
4890 flag_merge_constants = 0;
4896 flag_thread_jumps = 1;
4898 flag_delayed_branch = 1;
4900 #ifdef CAN_DEBUG_WITHOUT_FP
4901 flag_omit_frame_pointer = 1;
4903 flag_guess_branch_prob = 1;
4904 flag_cprop_registers = 1;
4905 flag_loop_optimize = 1;
4906 flag_crossjumping = 1;
4907 flag_if_conversion = 1;
4908 flag_if_conversion2 = 1;
4913 flag_optimize_sibling_calls = 1;
4914 flag_cse_follow_jumps = 1;
4915 flag_cse_skip_blocks = 1;
4917 flag_expensive_optimizations = 1;
4918 flag_strength_reduce = 1;
4919 flag_rerun_cse_after_loop = 1;
4920 flag_rerun_loop_opt = 1;
4921 flag_caller_saves = 1;
4924 #ifdef INSN_SCHEDULING
4925 flag_schedule_insns = 1;
4926 flag_schedule_insns_after_reload = 1;
4929 flag_strict_aliasing = 1;
4930 flag_delete_null_pointer_checks = 1;
4931 flag_reorder_blocks = 1;
4932 flag_reorder_functions = 1;
4937 flag_inline_functions = 1;
4938 flag_rename_registers = 1;
4946 align_functions = 1;
4948 /* Don't reorder blocks when optimizing for size because extra
4949 jump insns may be created; also barrier may create extra padding.
4951 More correctly we should have a block reordering mode that tried
4952 to minimize the combined size of all the jumps. This would more
4953 or less automatically remove extra jumps, but would also try to
4954 use more short jumps instead of long jumps. */
4955 flag_reorder_blocks = 0;
4958 /* Initialize whether `char' is signed. */
4959 flag_signed_char = DEFAULT_SIGNED_CHAR;
4960 #ifdef DEFAULT_SHORT_ENUMS
4961 /* Initialize how much space enums occupy, by default. */
4962 flag_short_enums = DEFAULT_SHORT_ENUMS;
4965 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4968 set_target_switch ("");
4970 /* Unwind tables are always present in an ABI-conformant IA-64
4971 object file, so the default should be ON. */
4972 #ifdef IA64_UNWIND_INFO
4973 flag_unwind_tables = IA64_UNWIND_INFO;
4976 #ifdef OPTIMIZATION_OPTIONS
4977 /* Allow default optimizations to be specified on a per-machine basis. */
4978 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4981 /* Perform normal command line switch decoding. */
4982 for (i = 1; i < argc;)
4985 int indep_processed;
4987 /* Give the language a chance to decode the option for itself. */
4988 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4990 if (lang_processed >= 0)
4991 /* Now see if the option also has a language independent meaning.
4992 Some options are both language specific and language independent,
4994 indep_processed = independent_decode_option (argc - i, argv + i);
4997 lang_processed = -lang_processed;
4998 indep_processed = 0;
5001 if (lang_processed || indep_processed)
5002 i += MAX (lang_processed, indep_processed);
5005 const char *option = NULL;
5006 const char *lang = NULL;
5009 /* It is possible that the command line switch is not valid for the
5010 current language, but it is valid for another language. In order
5011 to be compatible with previous versions of the compiler (which
5012 did not issue an error message in this case) we check for this
5013 possibility here. If we do find a match, then if extra_warnings
5014 is set we generate a warning message, otherwise we will just
5015 ignore the option. */
5016 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5018 option = documented_lang_options[j].option;
5021 lang = documented_lang_options[j].description;
5022 else if (! strncmp (argv[i], option, strlen (option)))
5026 if (j != ARRAY_SIZE (documented_lang_options))
5030 warning ("ignoring command line option '%s'", argv[i]);
5033 ("(it is valid for %s but not the selected language)",
5037 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5038 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5040 error ("unrecognized option `%s'", argv[i]);
5046 if (flag_no_inline == 2)
5049 flag_really_no_inline = flag_no_inline;
5051 /* Set flag_no_inline before the post_options () hook. The C front
5052 ends use it to determine tree inlining defaults. FIXME: such
5053 code should be lang-independent when all front ends use tree
5054 inlining, in which case it, and this condition, should be moved
5055 to the top of process_options() instead. */
5058 /* Inlining does not work if not optimizing,
5059 so force it not to be done. */
5063 /* The c_decode_option function and decode_option hook set
5064 this to `2' if -Wall is used, so we can avoid giving out
5065 lots of errors for people who don't realize what -Wall does. */
5066 if (warn_uninitialized == 1)
5067 warning ("-Wuninitialized is not supported without -O");
5070 if (flag_really_no_inline == 2)
5071 flag_really_no_inline = flag_no_inline;
5074 /* Process the options that have been parsed. */
5078 #ifdef OVERRIDE_OPTIONS
5079 /* Some machines may reject certain combinations of options. */
5083 /* Set up the align_*_log variables, defaulting them to 1 if they
5084 were still unset. */
5085 if (align_loops <= 0) align_loops = 1;
5086 if (align_loops_max_skip > align_loops || !align_loops)
5087 align_loops_max_skip = align_loops - 1;
5088 align_loops_log = floor_log2 (align_loops * 2 - 1);
5089 if (align_jumps <= 0) align_jumps = 1;
5090 if (align_jumps_max_skip > align_jumps || !align_jumps)
5091 align_jumps_max_skip = align_jumps - 1;
5092 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5093 if (align_labels <= 0) align_labels = 1;
5094 align_labels_log = floor_log2 (align_labels * 2 - 1);
5095 if (align_labels_max_skip > align_labels || !align_labels)
5096 align_labels_max_skip = align_labels - 1;
5097 if (align_functions <= 0) align_functions = 1;
5098 align_functions_log = floor_log2 (align_functions * 2 - 1);
5100 /* Unrolling all loops implies that standard loop unrolling must also
5102 if (flag_unroll_all_loops)
5103 flag_unroll_loops = 1;
5104 /* Loop unrolling requires that strength_reduction be on also. Silently
5105 turn on strength reduction here if it isn't already on. Also, the loop
5106 unrolling code assumes that cse will be run after loop, so that must
5107 be turned on also. */
5108 if (flag_unroll_loops)
5110 flag_strength_reduce = 1;
5111 flag_rerun_cse_after_loop = 1;
5114 if (flag_non_call_exceptions)
5115 flag_asynchronous_unwind_tables = 1;
5116 if (flag_asynchronous_unwind_tables)
5117 flag_unwind_tables = 1;
5119 /* Warn about options that are not supported on this machine. */
5120 #ifndef INSN_SCHEDULING
5121 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5122 warning ("instruction scheduling not supported on this target machine");
5125 if (flag_delayed_branch)
5126 warning ("this target machine does not have delayed branches");
5129 user_label_prefix = USER_LABEL_PREFIX;
5130 if (flag_leading_underscore != -1)
5132 /* If the default prefix is more complicated than "" or "_",
5133 issue a warning and ignore this option. */
5134 if (user_label_prefix[0] == 0 ||
5135 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5137 user_label_prefix = flag_leading_underscore ? "_" : "";
5140 warning ("-f%sleading-underscore not supported on this target machine",
5141 flag_leading_underscore ? "" : "no-");
5144 /* If we are in verbose mode, write out the version and maybe all the
5145 option flags in use. */
5148 print_version (stderr, "");
5150 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5153 if (! quiet_flag || flag_detailed_statistics)
5156 if (flag_syntax_only)
5158 write_symbols = NO_DEBUG;
5162 /* Now we know write_symbols, set up the debug hooks based on it.
5163 By default we do nothing for debug output. */
5164 #if defined(DBX_DEBUGGING_INFO)
5165 if (write_symbols == DBX_DEBUG)
5166 debug_hooks = &dbx_debug_hooks;
5168 #if defined(XCOFF_DEBUGGING_INFO)
5169 if (write_symbols == XCOFF_DEBUG)
5170 debug_hooks = &xcoff_debug_hooks;
5172 #ifdef SDB_DEBUGGING_INFO
5173 if (write_symbols == SDB_DEBUG)
5174 debug_hooks = &sdb_debug_hooks;
5176 #ifdef DWARF_DEBUGGING_INFO
5177 if (write_symbols == DWARF_DEBUG)
5178 debug_hooks = &dwarf_debug_hooks;
5180 #ifdef DWARF2_DEBUGGING_INFO
5181 if (write_symbols == DWARF2_DEBUG)
5182 debug_hooks = &dwarf2_debug_hooks;
5184 #ifdef VMS_DEBUGGING_INFO
5185 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5186 debug_hooks = &vmsdbg_debug_hooks;
5189 /* If auxiliary info generation is desired, open the output file.
5190 This goes in the same directory as the source file--unlike
5191 all the other output files. */
5192 if (flag_gen_aux_info)
5194 aux_info_file = fopen (aux_info_file_name, "w");
5195 if (aux_info_file == 0)
5196 fatal_io_error ("can't open %s", aux_info_file_name);
5199 if (! targetm.have_named_sections)
5201 if (flag_function_sections)
5203 warning ("-ffunction-sections not supported for this target");
5204 flag_function_sections = 0;
5206 if (flag_data_sections)
5208 warning ("-fdata-sections not supported for this target");
5209 flag_data_sections = 0;
5213 if (flag_function_sections && profile_flag)
5215 warning ("-ffunction-sections disabled; it makes profiling impossible");
5216 flag_function_sections = 0;
5219 #ifndef HAVE_prefetch
5220 if (flag_prefetch_loop_arrays)
5222 warning ("-fprefetch-loop-arrays not supported for this target");
5223 flag_prefetch_loop_arrays = 0;
5226 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5228 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5229 flag_prefetch_loop_arrays = 0;
5233 /* This combination of options isn't handled for i386 targets and doesn't
5234 make much sense anyway, so don't allow it. */
5235 if (flag_prefetch_loop_arrays && optimize_size)
5237 warning ("-fprefetch-loop-arrays is not supported with -Os");
5238 flag_prefetch_loop_arrays = 0;
5241 #ifndef OBJECT_FORMAT_ELF
5242 if (flag_function_sections && write_symbols != NO_DEBUG)
5243 warning ("-ffunction-sections may affect debugging on some targets");
5246 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5247 if (flag_signaling_nans)
5248 flag_trapping_math = 1;
5251 /* Initialize the compiler back end. */
5255 /* init_emit_once uses reg_raw_mode and therefore must be called
5256 after init_regs which initialized reg_raw_mode. */
5258 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5259 || debug_info_level == DINFO_LEVEL_VERBOSE
5260 #ifdef VMS_DEBUGGING_INFO
5261 /* Enable line number info for traceback */
5262 || debug_info_level > DINFO_LEVEL_NONE
5264 || flag_test_coverage
5265 || warn_notreached);
5266 init_fake_stack_mems ();
5270 init_function_once ();
5271 init_varasm_once ();
5273 /* The following initialization functions need to generate rtl, so
5274 provide a dummy function context for them. */
5275 init_dummy_function_start ();
5277 if (flag_caller_saves)
5278 init_caller_save ();
5279 expand_dummy_function_end ();
5282 /* Language-dependent initialization. Returns nonzero on success. */
5284 lang_dependent_init (name)
5287 if (dump_base_name == 0)
5288 dump_base_name = name ? name : "gccdump";
5290 /* Front-end initialization. This hook can assume that GC,
5291 identifier hashes etc. are set up, but debug initialization is
5292 not done yet. This routine must return the original filename
5293 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5294 name = (*lang_hooks.init) (name);
5298 /* Is this duplication necessary? */
5299 name = ggc_strdup (name);
5300 main_input_filename = input_filename = name;
5301 init_asm_output (name);
5303 /* These create various _DECL nodes, so need to be called after the
5304 front end is initialized. */
5308 /* The following initialization functions need to generate rtl, so
5309 provide a dummy function context for them. */
5310 init_dummy_function_start ();
5312 expand_dummy_function_end ();
5314 /* Put an entry on the input file stack for the main input file. */
5315 push_srcloc (input_filename, 0);
5317 /* If dbx symbol table desired, initialize writing it and output the
5318 predefined types. */
5319 timevar_push (TV_SYMOUT);
5321 #ifdef DWARF2_UNWIND_INFO
5322 if (dwarf2out_do_frame ())
5323 dwarf2out_frame_init ();
5326 /* Now we have the correct original filename, we can initialize
5328 (*debug_hooks->init) (name);
5330 timevar_pop (TV_SYMOUT);
5335 /* Clean up: close opened files, etc. */
5340 /* Close the dump files. */
5341 if (flag_gen_aux_info)
5343 fclose (aux_info_file);
5345 unlink (aux_info_file_name);
5348 /* Close non-debugging input and output files. Take special care to note
5349 whether fclose returns an error, since the pages might still be on the
5350 buffer chain while the file is open. */
5354 if (ferror (asm_out_file) != 0)
5355 fatal_io_error ("error writing to %s", asm_file_name);
5356 if (fclose (asm_out_file) != 0)
5357 fatal_io_error ("error closing %s", asm_file_name);
5360 /* Do whatever is necessary to finish printing the graphs. */
5361 if (graph_dump_format != no_graph)
5365 for (i = 0; i < (int) DFI_MAX; ++i)
5366 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5371 sprintf (seq, DUMPFILE_FORMAT, i);
5372 suffix = concat (seq, dump_file[i].extension, NULL);
5373 finish_graph_dump_file (dump_base_name, suffix);
5380 ggc_print_statistics ();
5381 stringpool_statistics ();
5382 dump_tree_statistics ();
5385 /* Free up memory for the benefit of leak detectors. */
5388 /* Language-specific end of compilation actions. */
5389 (*lang_hooks.finish) ();
5392 /* Initialize the compiler, and compile the input file. */
5396 /* All command line options have been parsed; allow the front end to
5397 perform consistency checks, etc. */
5398 bool no_backend = (*lang_hooks.post_options) ();
5400 /* The bulk of command line switch processing. */
5403 /* If an error has already occurred, give up. */
5411 char *name = xstrdup (lbasename (filename));
5413 aux_base_name = name;
5414 strip_off_ending (name, strlen (name));
5417 aux_base_name = "gccaux";
5419 /* We cannot start timing until after options are processed since that
5420 says if we run timers or not. */
5422 timevar_start (TV_TOTAL);
5424 /* Set up the back-end if requested. */
5428 /* Language-dependent initialization. Returns true on success. */
5429 if (lang_dependent_init (filename))
5434 /* Stop timing and print the times. */
5435 timevar_stop (TV_TOTAL);
5436 timevar_print (stderr);
5439 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5440 Decode command args, then call compile_file.
5441 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5442 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5444 It is not safe to call this function more than once. */
5447 toplev_main (argc, argv)
5451 /* Initialization of GCC's environment, and diagnostics. */
5452 general_init (argv[0]);
5454 /* Parse the options and do minimal processing; basically just
5455 enough to default flags appropriately. */
5456 parse_options_and_default_flags (argc, argv);
5458 /* Exit early if we can (e.g. -help). */
5459 if (!exit_after_options)
5462 if (errorcount || sorrycount)
5463 return (FATAL_EXIT_CODE);
5465 return (SUCCESS_EXIT_CODE);