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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
46 #include "insn-attr.h"
47 #include "insn-config.h"
48 #include "insn-flags.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
71 #include "langhooks.h"
72 #include "cfglayout.h"
74 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
75 #include "dwarf2out.h"
78 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
82 #ifdef SDB_DEBUGGING_INFO
86 #ifdef XCOFF_DEBUGGING_INFO
87 #include "xcoffout.h" /* Needed for external data
88 declarations for e.g. AIX 4.x. */
91 /* Carry information from ASM_DECLARE_OBJECT_NAME
92 to ASM_FINISH_DECLARE_OBJECT. */
94 extern int size_directive_output;
95 extern tree last_assemble_variable_decl;
97 extern void reg_alloc PARAMS ((void));
99 static void general_init PARAMS ((char *));
100 static bool parse_options_and_default_flags PARAMS ((int, char **));
101 static void do_compile PARAMS ((int));
102 static void process_options PARAMS ((void));
103 static void lang_independent_init PARAMS ((int));
104 static int lang_dependent_init PARAMS ((const char *));
105 static void init_asm_output PARAMS ((const char *));
106 static void finalize PARAMS ((void));
108 static void set_target_switch PARAMS ((const char *));
110 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
111 static void compile_file PARAMS ((void));
112 static void display_help PARAMS ((void));
113 static void display_target_options PARAMS ((void));
115 static void decode_d_option PARAMS ((const char *));
116 static int decode_f_option PARAMS ((const char *));
117 static int decode_W_option PARAMS ((const char *));
118 static int decode_g_option PARAMS ((const char *));
119 static unsigned int independent_decode_option PARAMS ((int, char **));
121 static void print_version PARAMS ((FILE *, const char *));
122 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
123 const char *, const char *,
124 const char *, const char *));
125 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
126 const char *, const char *));
128 /* Nonzero to dump debug info whilst parsing (-dy option). */
129 static int set_yydebug;
131 /* Length of line when printing switch values. */
134 /* Name of program invoked, sans directories. */
136 const char *progname;
138 /* Copy of arguments to toplev_main. */
142 /* Name of current original source file (what was input to cpp).
143 This comes from each #-command in the actual input. */
145 const char *input_filename;
147 /* Name of top-level original source file (what was input to cpp).
148 This comes from the #-command at the beginning of the actual input.
149 If there isn't any there, then this is the cc1 input file name. */
151 const char *main_input_filename;
153 /* Current line number in real source file. */
157 /* Nonzero if it is unsafe to create any new pseudo registers. */
160 /* Stack of currently pending input files. */
162 struct file_stack *input_file_stack;
164 /* Incremented on each change to input_file_stack. */
165 int input_file_stack_tick;
167 /* Name to use as base of names for dump output files. */
169 const char *dump_base_name;
171 /* Format to use to print dumpfile index value */
172 #ifndef DUMPFILE_FORMAT
173 #define DUMPFILE_FORMAT ".%02d."
176 /* Bit flags that specify the machine subtype we are compiling for.
177 Bits are tested using macros TARGET_... defined in the tm.h file
178 and set by `-m...' switches. Must be defined in rtlanal.c. */
180 extern int target_flags;
182 /* A mask of target_flags that includes bit X if X was set or cleared
183 on the command line. */
185 int target_flags_explicit;
187 /* Debug hooks - dependent upon command line options. */
189 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
191 /* Describes a dump file. */
193 struct dump_file_info
195 /* The unique extension to apply, e.g. ".jump". */
196 const char *const extension;
198 /* The -d<c> character that enables this dump file. */
199 char const debug_switch;
201 /* True if there is a corresponding graph dump file. */
202 char const graph_dump_p;
204 /* True if the user selected this dump. */
207 /* True if the files have been initialized (ie truncated). */
211 /* Enumerate the extant dump files. */
252 /* Describes all the dump files. Should be kept in order of the
253 pass and in sync with dump_file_index above.
255 Remaining -d letters:
261 static struct dump_file_info dump_file[DFI_MAX] =
263 { "rtl", 'r', 0, 0, 0 },
264 { "sibling", 'i', 0, 0, 0 },
265 { "eh", 'h', 0, 0, 0 },
266 { "jump", 'j', 0, 0, 0 },
267 { "ssa", 'e', 1, 0, 0 },
268 { "ssaccp", 'W', 1, 0, 0 },
269 { "ssadce", 'X', 1, 0, 0 },
270 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
271 { "null", 'u', 0, 0, 0 },
272 { "cse", 's', 0, 0, 0 },
273 { "addressof", 'F', 0, 0, 0 },
274 { "gcse", 'G', 1, 0, 0 },
275 { "loop", 'L', 1, 0, 0 },
276 { "cfg", 'f', 1, 0, 0 },
277 { "bp", 'b', 1, 0, 0 },
278 { "tracer", 'T', 1, 0, 0 },
279 { "cse2", 't', 1, 0, 0 },
280 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
281 { "combine", 'c', 1, 0, 0 },
282 { "ce", 'C', 1, 0, 0 },
283 { "regmove", 'N', 1, 0, 0 },
284 { "sched", 'S', 1, 0, 0 },
285 { "lreg", 'l', 1, 0, 0 },
286 { "greg", 'g', 1, 0, 0 },
287 { "postreload", 'o', 1, 0, 0 },
288 { "flow2", 'w', 1, 0, 0 },
289 { "peephole2", 'z', 1, 0, 0 },
290 { "rnreg", 'n', 1, 0, 0 },
291 { "ce2", 'E', 1, 0, 0 },
292 { "sched2", 'R', 1, 0, 0 },
293 { "stack", 'k', 1, 0, 0 },
294 { "bbro", 'B', 1, 0, 0 },
295 { "mach", 'M', 1, 0, 0 },
296 { "dbr", 'd', 0, 0, 0 },
299 static int open_dump_file PARAMS ((enum dump_file_index, tree));
300 static void close_dump_file PARAMS ((enum dump_file_index,
301 void (*) (FILE *, rtx), rtx));
303 /* Other flags saying which kinds of debugging dump have been requested. */
305 int rtl_dump_and_exit;
306 int flag_print_asm_name;
307 static int version_flag;
308 static char *filename;
309 enum graph_dump_types graph_dump_format;
311 /* Name for output file of assembly code, specified with -o. */
315 /* Value of the -G xx switch, and whether it was passed or not. */
319 /* Type(s) of debugging information we are producing (if any).
320 See flags.h for the definitions of the different possible
321 types of debugging information. */
322 enum debug_info_type write_symbols = NO_DEBUG;
324 /* Level of debugging information we are producing. See flags.h
325 for the definitions of the different possible levels. */
326 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
328 /* Nonzero means use GNU-only extensions in the generated symbolic
329 debugging information. */
330 /* Currently, this only has an effect when write_symbols is set to
331 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
332 int use_gnu_debug_info_extensions = 0;
334 /* Nonzero means do optimizations. -O.
335 Particular numeric values stand for particular amounts of optimization;
336 thus, -O2 stores 2 here. However, the optimizations beyond the basic
337 ones are not controlled directly by this variable. Instead, they are
338 controlled by individual `flag_...' variables that are defaulted
339 based on this variable. */
343 /* Nonzero means optimize for size. -Os.
344 The only valid values are zero and non-zero. When optimize_size is
345 non-zero, optimize defaults to 2, but certain individual code
346 bloating optimizations are disabled. */
348 int optimize_size = 0;
350 /* Nonzero if we should exit after parsing options. */
351 static int exit_after_options = 0;
353 /* The FUNCTION_DECL for the function currently being compiled,
354 or 0 if between functions. */
355 tree current_function_decl;
357 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
359 tree current_function_func_begin_label;
361 /* Nonzero if doing dwarf2 duplicate elimination. */
363 int flag_eliminate_dwarf2_dups = 0;
365 /* Nonzero if generating code to do profiling. */
367 int profile_flag = 0;
369 /* Nonzero if generating code to profile program flow graph arcs. */
371 int profile_arc_flag = 0;
373 /* Nonzero if we should not attempt to generate thread-safe
374 code to profile program flow graph arcs. */
376 int flag_unsafe_profile_arcs = 0;
378 /* Nonzero if generating info for gcov to calculate line test coverage. */
380 int flag_test_coverage = 0;
382 /* Nonzero indicates that branch taken probabilities should be calculated. */
384 int flag_branch_probabilities = 0;
386 /* Nonzero if basic blocks should be reordered. */
388 int flag_reorder_blocks = 0;
390 /* Nonzero if functions should be reordered. */
392 int flag_reorder_functions = 0;
394 /* Nonzero if registers should be renamed. */
396 int flag_rename_registers = 0;
397 int flag_cprop_registers = 0;
399 /* Nonzero for -pedantic switch: warn about anything
400 that standard spec forbids. */
404 /* Temporarily suppress certain warnings.
405 This is set while reading code from a system header file. */
407 int in_system_header = 0;
409 /* Don't print functions as they are compiled. -quiet. */
413 /* Print times taken by the various passes. -ftime-report. */
417 /* Print memory still in use at end of compilation (which may have little
418 to do with peak memory consumption). -fmem-report. */
422 /* Non-zero means to collect statistics which might be expensive
423 and to print them when we are done. */
424 int flag_detailed_statistics = 0;
429 /* Nonzero means `char' should be signed. */
431 int flag_signed_char;
433 /* Nonzero means give an enum type only as many bytes as it needs. */
435 int flag_short_enums;
437 /* Nonzero for -fcaller-saves: allocate values in regs that need to
438 be saved across function calls, if that produces overall better code.
439 Optional now, so people can test it. */
441 #ifdef DEFAULT_CALLER_SAVES
442 int flag_caller_saves = 1;
444 int flag_caller_saves = 0;
447 /* Nonzero if structures and unions should be returned in memory.
449 This should only be defined if compatibility with another compiler or
450 with an ABI is needed, because it results in slower code. */
452 #ifndef DEFAULT_PCC_STRUCT_RETURN
453 #define DEFAULT_PCC_STRUCT_RETURN 1
456 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
458 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
460 /* Nonzero for -fforce-mem: load memory value into a register
461 before arithmetic on it. This makes better cse but slower compilation. */
463 int flag_force_mem = 0;
465 /* Nonzero for -fforce-addr: load memory address into a register before
466 reference to memory. This makes better cse but slower compilation. */
468 int flag_force_addr = 0;
470 /* Nonzero for -fdefer-pop: don't pop args after each function call;
471 instead save them up to pop many calls' args with one insns. */
473 int flag_defer_pop = 0;
475 /* Nonzero for -ffloat-store: don't allocate floats and doubles
476 in extended-precision registers. */
478 int flag_float_store = 0;
480 /* Nonzero for -fcse-follow-jumps:
481 have cse follow jumps to do a more extensive job. */
483 int flag_cse_follow_jumps;
485 /* Nonzero for -fcse-skip-blocks:
486 have cse follow a branch around a block. */
487 int flag_cse_skip_blocks;
489 /* Nonzero for -fexpensive-optimizations:
490 perform miscellaneous relatively-expensive optimizations. */
491 int flag_expensive_optimizations;
493 /* Nonzero for -fthread-jumps:
494 have jump optimize output of loop. */
496 int flag_thread_jumps;
498 /* Nonzero enables strength-reduction in loop.c. */
500 int flag_strength_reduce = 0;
502 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
503 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
504 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
507 int flag_unroll_loops;
509 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
510 This is generally not a win. */
512 int flag_unroll_all_loops;
514 /* Nonzero enables prefetch optimizations for arrays in loops. */
516 int flag_prefetch_loop_arrays;
518 /* Nonzero forces all invariant computations in loops to be moved
521 int flag_move_all_movables = 0;
523 /* Nonzero forces all general induction variables in loops to be
526 int flag_reduce_all_givs = 0;
528 /* Nonzero to perform full register move optimization passes. This is the
531 int flag_regmove = 0;
533 /* Nonzero for -fwritable-strings:
534 store string constants in data segment and don't uniquize them. */
536 int flag_writable_strings = 0;
538 /* Nonzero means don't put addresses of constant functions in registers.
539 Used for compiling the Unix kernel, where strange substitutions are
540 done on the assembly output. */
542 int flag_no_function_cse = 0;
544 /* Nonzero for -fomit-frame-pointer:
545 don't make a frame pointer in simple functions that don't require one. */
547 int flag_omit_frame_pointer = 0;
549 /* Nonzero means place each function into its own section on those platforms
550 which support arbitrary section names and unlimited numbers of sections. */
552 int flag_function_sections = 0;
554 /* ... and similar for data. */
556 int flag_data_sections = 0;
558 /* Nonzero to inhibit use of define_optimization peephole opts. */
560 int flag_no_peephole = 0;
562 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
564 int flag_optimize_sibling_calls = 0;
566 /* Nonzero means the front end generally wants `errno' maintained by math
567 operations, like built-in SQRT. */
569 int flag_errno_math = 1;
571 /* Nonzero means that unsafe floating-point math optimizations are allowed
572 for the sake of speed. IEEE compliance is not guaranteed, and operations
573 are allowed to assume that their arguments and results are "normal"
574 (e.g., nonnegative for SQRT). */
576 int flag_unsafe_math_optimizations = 0;
578 /* Zero means that floating-point math operations cannot generate a
579 (user-visible) trap. This is the case, for example, in nonstop
580 IEEE 754 arithmetic. Trapping conditions include division by zero,
581 overflow, underflow, invalid and inexact, but does not include
582 operations on signaling NaNs (see below). */
584 int flag_trapping_math = 1;
586 /* Nonzero means disable transformations observable by signaling NaNs.
587 This option implies that any operation on a IEEE signaling NaN can
588 generate a (user-visible) trap. */
590 int flag_signaling_nans = 0;
592 /* 0 means straightforward implementation of complex divide acceptable.
593 1 means wide ranges of inputs must work for complex divide.
594 2 means C99-like requirements for complex divide (not yet implemented). */
596 int flag_complex_divide_method = 0;
598 /* Nonzero means all references through pointers are volatile. */
602 /* Nonzero means treat all global and extern variables as volatile. */
604 int flag_volatile_global;
606 /* Nonzero means treat all static variables as volatile. */
608 int flag_volatile_static;
610 /* Nonzero means just do syntax checking; don't output anything. */
612 int flag_syntax_only = 0;
614 /* Nonzero means perform global cse. */
616 static int flag_gcse;
618 /* Nonzero means perform loop optimizer. */
620 static int flag_loop_optimize;
622 /* Nonzero means perform crossjumping. */
624 static int flag_crossjumping;
626 /* Nonzero means perform if conversion. */
628 static int flag_if_conversion;
630 /* Nonzero means perform if conversion after reload. */
632 static int flag_if_conversion2;
634 /* Nonzero means to use global dataflow analysis to eliminate
635 useless null pointer tests. */
637 static int flag_delete_null_pointer_checks;
639 /* Nonzero means to do the enhanced load motion during gcse, which trys
640 to hoist loads by not killing them when a store to the same location
643 int flag_gcse_lm = 1;
645 /* Nonzero means to perform store motion after gcse, which will try to
646 move stores closer to the exit block. Its not very effective without
649 int flag_gcse_sm = 1;
651 /* Nonzero means to rerun cse after loop optimization. This increases
652 compilation time about 20% and picks up a few more common expressions. */
654 static int flag_rerun_cse_after_loop;
656 /* Nonzero means to run loop optimizations twice. */
658 int flag_rerun_loop_opt;
660 /* Nonzero for -finline-functions: ok to inline functions that look like
661 good inline candidates. */
663 int flag_inline_functions;
665 /* Nonzero for -fkeep-inline-functions: even if we make a function
666 go inline everywhere, keep its definition around for debugging
669 int flag_keep_inline_functions;
671 /* Nonzero means that functions will not be inlined. */
673 int flag_no_inline = 2;
675 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
676 not just because the tree inliner turned us off. */
678 int flag_really_no_inline = 2;
680 /* Nonzero means that we should emit static const variables
681 regardless of whether or not optimization is turned on. */
683 int flag_keep_static_consts = 1;
685 /* Nonzero means we should be saving declaration info into a .X file. */
687 int flag_gen_aux_info = 0;
689 /* Specified name of aux-info file. */
691 static char *aux_info_file_name;
693 /* Nonzero means make the text shared if supported. */
695 int flag_shared_data;
697 /* Nonzero means schedule into delayed branch slots if supported. */
699 int flag_delayed_branch;
701 /* Nonzero if we are compiling pure (sharable) code.
702 Value is 1 if we are doing "small" pic; value is 2 if we're doing
707 /* Set to the default thread-local storage (tls) model to use. */
709 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
711 /* Nonzero means generate extra code for exception handling and enable
712 exception handling. */
716 /* Nonzero means generate frame unwind info table when supported. */
718 int flag_unwind_tables = 0;
720 /* Nonzero means generate frame unwind info table exact at each insn boundary */
722 int flag_asynchronous_unwind_tables = 0;
724 /* Nonzero means don't place uninitialized global data in common storage
729 /* Nonzero means change certain warnings into errors.
730 Usually these are warnings about failure to conform to some standard. */
732 int flag_pedantic_errors = 0;
734 /* flag_schedule_insns means schedule insns within basic blocks (before
736 flag_schedule_insns_after_reload means schedule insns after
739 int flag_schedule_insns = 0;
740 int flag_schedule_insns_after_reload = 0;
742 /* The following flags have effect only for scheduling before register
745 flag_schedule_interblock means schedule insns accross basic blocks.
746 flag_schedule_speculative means allow speculative motion of non-load insns.
747 flag_schedule_speculative_load means allow speculative motion of some
749 flag_schedule_speculative_load_dangerous allows speculative motion of more
752 int flag_schedule_interblock = 1;
753 int flag_schedule_speculative = 1;
754 int flag_schedule_speculative_load = 0;
755 int flag_schedule_speculative_load_dangerous = 0;
757 int flag_single_precision_constant;
759 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
760 by a cheaper branch on a count register. */
761 int flag_branch_on_count_reg = 1;
763 /* -finhibit-size-directive inhibits output of .size for ELF.
764 This is used only for compiling crtstuff.c,
765 and it may be extended to other effects
766 needed for crtstuff.c on other systems. */
767 int flag_inhibit_size_directive = 0;
769 /* -fverbose-asm causes extra commentary information to be produced in
770 the generated assembly code (to make it more readable). This option
771 is generally only of use to those who actually need to read the
772 generated assembly code (perhaps while debugging the compiler itself).
773 -fno-verbose-asm, the default, causes the extra information
774 to be omitted and is useful when comparing two assembler files. */
776 int flag_verbose_asm = 0;
778 /* -dA causes debug commentary information to be produced in
779 the generated assembly code (to make it more readable). This option
780 is generally only of use to those who actually need to read the
781 generated assembly code (perhaps while debugging the compiler itself).
782 Currently, this switch is only used by dwarfout.c; however, it is intended
783 to be a catchall for printing debug information in the assembler file. */
785 int flag_debug_asm = 0;
787 /* -dP causes the rtl to be emitted as a comment in assembly. */
789 int flag_dump_rtl_in_asm = 0;
791 /* -fgnu-linker specifies use of the GNU linker for initializations.
792 (Or, more generally, a linker that handles initializations.)
793 -fno-gnu-linker says that collect2 will be used. */
795 int flag_gnu_linker = 0;
797 int flag_gnu_linker = 1;
800 /* Nonzero means put zero initialized data in the bss section. */
801 int flag_zero_initialized_in_bss = 1;
806 /* Enable ssa conditional constant propagation. */
807 int flag_ssa_ccp = 0;
809 /* Enable ssa aggressive dead code elimination. */
810 int flag_ssa_dce = 0;
812 /* Tag all structures with __attribute__(packed). */
813 int flag_pack_struct = 0;
815 /* Emit code to check for stack overflow; also may cause large objects
816 to be allocated dynamically. */
817 int flag_stack_check;
819 /* When non-NULL, indicates that whenever space is allocated on the
820 stack, the resulting stack pointer must not pass this
821 address---that is, for stacks that grow downward, the stack pointer
822 must always be greater than or equal to this address; for stacks
823 that grow upward, the stack pointer must be less than this address.
824 At present, the rtx may be either a REG or a SYMBOL_REF, although
825 the support provided depends on the backend. */
828 /* 0 if pointer arguments may alias each other. True in C.
829 1 if pointer arguments may not alias each other but may alias
831 2 if pointer arguments may not alias each other and may not
832 alias global variables. True in Fortran.
833 This defaults to 0 for C. */
834 int flag_argument_noalias = 0;
836 /* Nonzero if we should do (language-dependent) alias analysis.
837 Typically, this analysis will assume that expressions of certain
838 types do not alias expressions of certain other types. Only used
839 if alias analysis (in general) is enabled. */
840 int flag_strict_aliasing = 0;
842 /* Instrument functions with calls at entry and exit, for profiling. */
843 int flag_instrument_function_entry_exit = 0;
845 /* Nonzero means ignore `#ident' directives. 0 means handle them.
846 On SVR4 targets, it also controls whether or not to emit a
847 string identifying the compiler. */
849 int flag_no_ident = 0;
851 /* This will perform a peephole pass before sched2. */
852 int flag_peephole2 = 0;
854 /* This will try to guess branch probabilities. */
855 int flag_guess_branch_prob = 0;
857 /* -fbounded-pointers causes gcc to compile pointers as composite
858 objects occupying three words: the pointer value, the base address
859 of the referent object, and the address immediately beyond the end
860 of the referent object. The base and extent allow us to perform
861 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
862 int flag_bounded_pointers = 0;
864 /* -fcheck-bounds causes gcc to generate array bounds checks.
865 For C, C++: defaults to value of flag_bounded_pointers.
866 For ObjC: defaults to off.
867 For Java: defaults to on.
868 For Fortran: defaults to off.
869 For CHILL: defaults to off. */
870 int flag_bounds_check = 0;
872 /* This will attempt to merge constant section constants, if 1 only
873 string constants and constants from constant pool, if 2 also constant
875 int flag_merge_constants = 1;
877 /* If one, renumber instruction UIDs to reduce the number of
878 unused UIDs if there are a lot of instructions. If greater than
879 one, unconditionally renumber instruction UIDs. */
880 int flag_renumber_insns = 1;
882 /* If nonzero, use the graph coloring register allocator. */
883 int flag_new_regalloc = 0;
885 /* Nonzero if we perform superblock formation. */
889 /* Values of the -falign-* flags: how much to align labels in code.
890 0 means `use default', 1 means `don't align'.
891 For each variable, there is an _log variant which is the power
892 of two not less than the variable, for .align output. */
896 int align_loops_max_skip;
899 int align_jumps_max_skip;
901 int align_labels_log;
902 int align_labels_max_skip;
904 int align_functions_log;
906 /* Table of supported debugging formats. */
909 const char *const arg;
910 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
911 constant expression, we use NO_DEBUG in its place. */
912 const enum debug_info_type debug_type;
913 const int use_extensions_p;
914 const char *const description;
918 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
919 N_("Generate debugging info in default format") },
920 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
921 #ifdef DBX_DEBUGGING_INFO
922 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
923 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
925 #ifdef DWARF_DEBUGGING_INFO
926 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
927 { "dwarf+", DWARF_DEBUG, 1,
928 N_("Generate extended DWARF-1 format debug info") },
930 #ifdef DWARF2_DEBUGGING_INFO
931 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
933 #ifdef XCOFF_DEBUGGING_INFO
934 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
935 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
937 #ifdef SDB_DEBUGGING_INFO
938 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
940 #ifdef VMS_DEBUGGING_INFO
941 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
948 const char *const string;
951 const char *const description;
953 lang_independent_options;
957 /* Add or remove a leading underscore from user symbols. */
958 int flag_leading_underscore = -1;
960 /* The user symbol prefix after having resolved same. */
961 const char *user_label_prefix;
963 static const param_info lang_independent_params[] = {
964 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
965 { OPTION, DEFAULT, HELP },
966 #include "params.def"
971 /* A default for same. */
972 #ifndef USER_LABEL_PREFIX
973 #define USER_LABEL_PREFIX ""
976 /* Table of language-independent -f options.
977 STRING is the option name. VARIABLE is the address of the variable.
978 ON_VALUE is the value to store in VARIABLE
979 if `-fSTRING' is seen as an option.
980 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
982 static const lang_independent_options f_options[] =
984 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
985 N_("Perform DWARF2 duplicate elimination") },
986 {"float-store", &flag_float_store, 1,
987 N_("Do not store floats in registers") },
988 {"volatile", &flag_volatile, 1,
989 N_("Consider all mem refs through pointers as volatile") },
990 {"volatile-global", &flag_volatile_global, 1,
991 N_("Consider all mem refs to global data to be volatile") },
992 {"volatile-static", &flag_volatile_static, 1,
993 N_("Consider all mem refs to static data to be volatile") },
994 {"defer-pop", &flag_defer_pop, 1,
995 N_("Defer popping functions args from stack until later") },
996 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
997 N_("When possible do not generate stack frames") },
998 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
999 N_("Optimize sibling and tail recursive calls") },
1000 {"tracer", &flag_tracer, 1,
1001 N_("Perform superblock formation via tail duplication") },
1002 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1003 N_("When running CSE, follow jumps to their targets") },
1004 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1005 N_("When running CSE, follow conditional jumps") },
1006 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1007 N_("Perform a number of minor, expensive optimizations") },
1008 {"thread-jumps", &flag_thread_jumps, 1,
1009 N_("Perform jump threading optimizations") },
1010 {"strength-reduce", &flag_strength_reduce, 1,
1011 N_("Perform strength reduction optimizations") },
1012 {"unroll-loops", &flag_unroll_loops, 1,
1013 N_("Perform loop unrolling when iteration count is known") },
1014 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1015 N_("Perform loop unrolling for all loops") },
1016 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1017 N_("Generate prefetch instructions, if available, for arrays in loops") },
1018 {"move-all-movables", &flag_move_all_movables, 1,
1019 N_("Force all loop invariant computations out of loops") },
1020 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1021 N_("Strength reduce all loop general induction variables") },
1022 {"writable-strings", &flag_writable_strings, 1,
1023 N_("Store strings in writable data section") },
1024 {"peephole", &flag_no_peephole, 0,
1025 N_("Enable machine specific peephole optimizations") },
1026 {"force-mem", &flag_force_mem, 1,
1027 N_("Copy memory operands into registers before using") },
1028 {"force-addr", &flag_force_addr, 1,
1029 N_("Copy memory address constants into regs before using") },
1030 {"function-cse", &flag_no_function_cse, 0,
1031 N_("Allow function addresses to be held in registers") },
1032 {"inline-functions", &flag_inline_functions, 1,
1033 N_("Integrate simple functions into their callers") },
1034 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1035 N_("Generate code for funcs even if they are fully inlined") },
1036 {"inline", &flag_no_inline, 0,
1037 N_("Pay attention to the 'inline' keyword") },
1038 {"keep-static-consts", &flag_keep_static_consts, 1,
1039 N_("Emit static const variables even if they are not used") },
1040 {"syntax-only", &flag_syntax_only, 1,
1041 N_("Check for syntax errors, then stop") },
1042 {"shared-data", &flag_shared_data, 1,
1043 N_("Mark data as shared rather than private") },
1044 {"caller-saves", &flag_caller_saves, 1,
1045 N_("Enable saving registers around function calls") },
1046 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1047 N_("Return 'short' aggregates in memory, not registers") },
1048 {"reg-struct-return", &flag_pcc_struct_return, 0,
1049 N_("Return 'short' aggregates in registers") },
1050 {"delayed-branch", &flag_delayed_branch, 1,
1051 N_("Attempt to fill delay slots of branch instructions") },
1052 {"gcse", &flag_gcse, 1,
1053 N_("Perform the global common subexpression elimination") },
1054 {"gcse-lm", &flag_gcse_lm, 1,
1055 N_("Perform enhanced load motion during global subexpression elimination") },
1056 {"gcse-sm", &flag_gcse_sm, 1,
1057 N_("Perform store motion after global subexpression elimination") },
1058 {"loop-optimize", &flag_loop_optimize, 1,
1059 N_("Perform the loop optimizations") },
1060 {"crossjumping", &flag_crossjumping, 1,
1061 N_("Perform cross-jumping optimization") },
1062 {"if-conversion", &flag_if_conversion, 1,
1063 N_("Perform conversion of conditional jumps to branchless equivalents") },
1064 {"if-conversion2", &flag_if_conversion2, 1,
1065 N_("Perform conversion of conditional jumps to conditional execution") },
1066 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1067 N_("Run CSE pass after loop optimizations") },
1068 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1069 N_("Run the loop optimizer twice") },
1070 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1071 N_("Delete useless null pointer checks") },
1072 {"schedule-insns", &flag_schedule_insns, 1,
1073 N_("Reschedule instructions before register allocation") },
1074 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1075 N_("Reschedule instructions after register allocation") },
1076 {"sched-interblock",&flag_schedule_interblock, 1,
1077 N_("Enable scheduling across basic blocks") },
1078 {"sched-spec",&flag_schedule_speculative, 1,
1079 N_("Allow speculative motion of non-loads") },
1080 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1081 N_("Allow speculative motion of some loads") },
1082 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1083 N_("Allow speculative motion of more loads") },
1084 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1085 N_("Replace add,compare,branch with branch on count reg") },
1086 {"pic", &flag_pic, 1,
1087 N_("Generate position independent code, if possible") },
1088 {"PIC", &flag_pic, 2, ""},
1089 {"exceptions", &flag_exceptions, 1,
1090 N_("Enable exception handling") },
1091 {"unwind-tables", &flag_unwind_tables, 1,
1092 N_("Just generate unwind tables for exception handling") },
1093 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1094 N_("Generate unwind tables exact at each instruction boundary") },
1095 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1096 N_("Support synchronous non-call exceptions") },
1097 {"profile-arcs", &profile_arc_flag, 1,
1098 N_("Insert arc based program profiling code") },
1099 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs, 1,
1100 N_("Avoid thread safety profiling overhead") },
1101 {"test-coverage", &flag_test_coverage, 1,
1102 N_("Create data files needed by gcov") },
1103 {"branch-probabilities", &flag_branch_probabilities, 1,
1104 N_("Use profiling information for branch probabilities") },
1105 {"profile", &profile_flag, 1,
1106 N_("Enable basic program profiling code") },
1107 {"reorder-blocks", &flag_reorder_blocks, 1,
1108 N_("Reorder basic blocks to improve code placement") },
1109 {"reorder-functions", &flag_reorder_functions, 1,
1110 N_("Reorder functions to improve code placement") },
1111 {"rename-registers", &flag_rename_registers, 1,
1112 N_("Do the register renaming optimization pass") },
1113 {"cprop-registers", &flag_cprop_registers, 1,
1114 N_("Do the register copy-propagation optimization pass") },
1115 {"common", &flag_no_common, 0,
1116 N_("Do not put uninitialized globals in the common section") },
1117 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1118 N_("Do not generate .size directives") },
1119 {"function-sections", &flag_function_sections, 1,
1120 N_("place each function into its own section") },
1121 {"data-sections", &flag_data_sections, 1,
1122 N_("place data items into their own section") },
1123 {"verbose-asm", &flag_verbose_asm, 1,
1124 N_("Add extra commentry to assembler output") },
1125 {"gnu-linker", &flag_gnu_linker, 1,
1126 N_("Output GNU ld formatted global initializers") },
1127 {"regmove", &flag_regmove, 1,
1128 N_("Enables a register move optimization") },
1129 {"optimize-register-move", &flag_regmove, 1,
1130 N_("Do the full regmove optimization pass") },
1131 {"pack-struct", &flag_pack_struct, 1,
1132 N_("Pack structure members together without holes") },
1133 {"stack-check", &flag_stack_check, 1,
1134 N_("Insert stack checking code into the program") },
1135 {"argument-alias", &flag_argument_noalias, 0,
1136 N_("Specify that arguments may alias each other & globals") },
1137 {"argument-noalias", &flag_argument_noalias, 1,
1138 N_("Assume arguments may alias globals but not each other") },
1139 {"argument-noalias-global", &flag_argument_noalias, 2,
1140 N_("Assume arguments do not alias each other or globals") },
1141 {"strict-aliasing", &flag_strict_aliasing, 1,
1142 N_("Assume strict aliasing rules apply") },
1143 {"align-loops", &align_loops, 0,
1144 N_("Align the start of loops") },
1145 {"align-jumps", &align_jumps, 0,
1146 N_("Align labels which are only reached by jumping") },
1147 {"align-labels", &align_labels, 0,
1148 N_("Align all labels") },
1149 {"align-functions", &align_functions, 0,
1150 N_("Align the start of functions") },
1151 {"merge-constants", &flag_merge_constants, 1,
1152 N_("Attempt to merge identical constants accross compilation units") },
1153 {"merge-all-constants", &flag_merge_constants, 2,
1154 N_("Attempt to merge identical constants and constant variables") },
1155 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1156 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1157 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1158 N_("Instrument function entry/exit with profiling calls") },
1159 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1160 N_("Put zero initialized data in the bss section") },
1161 {"ssa", &flag_ssa, 1,
1162 N_("Enable SSA optimizations") },
1163 {"ssa-ccp", &flag_ssa_ccp, 1,
1164 N_("Enable SSA conditional constant propagation") },
1165 {"ssa-dce", &flag_ssa_dce, 1,
1166 N_("Enable aggressive SSA dead code elimination") },
1167 {"leading-underscore", &flag_leading_underscore, 1,
1168 N_("External symbols have a leading underscore") },
1169 {"ident", &flag_no_ident, 0,
1170 N_("Process #ident directives") },
1171 { "peephole2", &flag_peephole2, 1,
1172 N_("Enables an rtl peephole pass run before sched2") },
1173 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1174 N_("Enables guessing of branch probabilities") },
1175 {"math-errno", &flag_errno_math, 1,
1176 N_("Set errno after built-in math functions") },
1177 {"trapping-math", &flag_trapping_math, 1,
1178 N_("Floating-point operations can trap") },
1179 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1180 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1181 {"signaling-nans", &flag_signaling_nans, 1,
1182 N_("Disable optimizations observable by IEEE signaling NaNs") },
1183 {"bounded-pointers", &flag_bounded_pointers, 1,
1184 N_("Compile pointers as triples: value, base & end") },
1185 {"bounds-check", &flag_bounds_check, 1,
1186 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1187 {"single-precision-constant", &flag_single_precision_constant, 1,
1188 N_("Convert floating point constant to single precision constant") },
1189 {"time-report", &time_report, 1,
1190 N_("Report time taken by each compiler pass at end of run") },
1191 {"mem-report", &mem_report, 1,
1192 N_("Report on permanent memory allocation at end of run") },
1193 { "trapv", &flag_trapv, 1,
1194 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1195 { "new-ra", &flag_new_regalloc, 1,
1196 N_("Use graph coloring register allocation.") },
1199 /* Table of language-specific options. */
1201 static const struct lang_opt
1203 const char *const option;
1204 const char *const description;
1206 documented_lang_options[] =
1208 /* In order not to overload the --help output, the convention
1209 used here is to only describe those options which are not
1210 enabled by default. */
1213 N_("Compile just for ISO C90") },
1215 N_("Determine language standard") },
1217 { "-fsigned-bitfields", "" },
1218 { "-funsigned-bitfields",
1219 N_("Make bit-fields by unsigned by default") },
1220 { "-fno-signed-bitfields", "" },
1221 { "-fno-unsigned-bitfields","" },
1223 N_("Make 'char' be signed by default") },
1224 { "-funsigned-char",
1225 N_("Make 'char' be unsigned by default") },
1226 { "-fno-signed-char", "" },
1227 { "-fno-unsigned-char", "" },
1231 N_("Do not recognize the 'asm' keyword") },
1232 { "-fbuiltin", "" },
1234 N_("Do not recognize any built in functions") },
1236 N_("Assume normal C execution environment") },
1237 { "-fno-hosted", "" },
1239 N_("Assume that standard libraries & main might not exist") },
1240 { "-fno-freestanding", "" },
1241 { "-fcond-mismatch",
1242 N_("Allow different types as args of ? operator") },
1243 { "-fno-cond-mismatch", "" },
1244 { "-fdollars-in-identifiers",
1245 N_("Allow the use of $ inside identifiers") },
1246 { "-fno-dollars-in-identifiers", "" },
1247 { "-fpreprocessed", "" },
1248 { "-fno-preprocessed", "" },
1250 N_("Use the same size for double as for float") },
1251 { "-fno-short-double", "" },
1253 N_("Use the smallest fitting integer to hold enums") },
1254 { "-fno-short-enums", "" },
1256 N_("Override the underlying type for wchar_t to `unsigned short'") },
1257 { "-fno-short-wchar", "" },
1260 N_("Enable most warning messages") },
1261 { "-Wbad-function-cast",
1262 N_("Warn about casting functions to incompatible types") },
1263 { "-Wno-bad-function-cast", "" },
1264 { "-Wmissing-format-attribute",
1265 N_("Warn about functions which might be candidates for format attributes") },
1266 { "-Wno-missing-format-attribute", "" },
1268 N_("Warn about casts which discard qualifiers") },
1269 { "-Wno-cast-qual", "" },
1270 { "-Wchar-subscripts",
1271 N_("Warn about subscripts whose type is 'char'") },
1272 { "-Wno-char-subscripts", "" },
1274 N_("Warn if nested comments are detected") },
1275 { "-Wno-comment", "" },
1277 N_("Warn if nested comments are detected") },
1278 { "-Wno-comments", "" },
1280 N_("Warn about possibly confusing type conversions") },
1281 { "-Wno-conversion", "" },
1282 { "-Wdiv-by-zero", "" },
1283 { "-Wno-div-by-zero",
1284 N_("Do not warn about compile-time integer division by zero") },
1286 N_("Warn about testing equality of floating point numbers") },
1287 { "-Wno-float-equal", "" },
1289 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1290 { "-Wno-format", "" },
1291 { "-Wformat-extra-args", "" },
1292 { "-Wno-format-extra-args",
1293 N_("Don't warn about too many arguments to format functions") },
1294 { "-Wformat-nonliteral",
1295 N_("Warn about non-string-literal format strings") },
1296 { "-Wno-format-nonliteral", "" },
1297 { "-Wformat-security",
1298 N_("Warn about possible security problems with format functions") },
1299 { "-Wno-format-security", "" },
1300 { "-Wformat-y2k", "" },
1301 { "-Wno-format-y2k",
1302 N_("Don't warn about strftime formats yielding 2 digit years") },
1303 { "-Wimplicit-function-declaration",
1304 N_("Warn about implicit function declarations") },
1305 { "-Wno-implicit-function-declaration", "" },
1306 { "-Werror-implicit-function-declaration", "" },
1308 N_("Warn when a declaration does not specify a type") },
1309 { "-Wno-implicit-int", "" },
1310 { "-Wimplicit", "" },
1311 { "-Wno-implicit", "" },
1313 N_("Warn about the use of the #import directive") },
1314 { "-Wno-import", "" },
1315 { "-Wlong-long","" },
1317 N_("Do not warn about using 'long long' when -pedantic") },
1319 N_("Warn about suspicious declarations of main") },
1320 { "-Wno-main", "" },
1321 { "-Wmissing-braces",
1322 N_("Warn about possibly missing braces around initializers") },
1323 { "-Wno-missing-braces", "" },
1324 { "-Wmissing-declarations",
1325 N_("Warn about global funcs without previous declarations") },
1326 { "-Wno-missing-declarations", "" },
1327 { "-Wmissing-prototypes",
1328 N_("Warn about global funcs without prototypes") },
1329 { "-Wno-missing-prototypes", "" },
1331 N_("Warn about use of multicharacter literals") },
1332 { "-Wno-multichar", "" },
1333 { "-Wnested-externs",
1334 N_("Warn about externs not at file scope level") },
1335 { "-Wno-nested-externs", "" },
1337 N_("Warn about possible missing parentheses") },
1338 { "-Wno-parentheses", "" },
1339 { "-Wpointer-arith",
1340 N_("Warn about function pointer arithmetic") },
1341 { "-Wno-pointer-arith", "" },
1342 { "-Wredundant-decls",
1343 N_("Warn about multiple declarations of the same object") },
1344 { "-Wno-redundant-decls", "" },
1346 N_("Warn whenever a function's return-type defaults to int") },
1347 { "-Wno-return-type", "" },
1348 { "-Wsequence-point",
1349 N_("Warn about possible violations of sequence point rules") },
1350 { "-Wno-sequence-point", "" },
1352 N_("Warn about signed/unsigned comparisons") },
1353 { "-Wno-sign-compare", "" },
1354 { "-Wstrict-prototypes",
1355 N_("Warn about non-prototyped function decls") },
1356 { "-Wno-strict-prototypes", "" },
1358 N_("Warn about constructs whose meanings change in ISO C") },
1359 { "-Wno-traditional", "" },
1361 N_("Warn when trigraphs are encountered") },
1362 { "-Wno-trigraphs", "" },
1364 { "-Wno-undef", "" },
1365 { "-Wunknown-pragmas",
1366 N_("Warn about unrecognized pragmas") },
1367 { "-Wno-unknown-pragmas", "" },
1368 { "-Wwrite-strings",
1369 N_("Mark strings as 'const char *'") },
1370 { "-Wno-write-strings", "" },
1372 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1374 #include "options.h"
1378 /* Here is a table, controlled by the tm.h file, listing each -m switch
1379 and which bits in `target_switches' it should set or clear.
1380 If VALUE is positive, it is bits to set.
1381 If VALUE is negative, -VALUE is bits to clear.
1382 (The sign bit is not used so there is no confusion.) */
1386 const char *const name;
1388 const char *const description;
1390 target_switches[] = TARGET_SWITCHES;
1392 /* This table is similar, but allows the switch to have a value. */
1394 #ifdef TARGET_OPTIONS
1397 const char *const prefix;
1398 const char **const variable;
1399 const char *const description;
1401 target_options[] = TARGET_OPTIONS;
1404 /* Options controlling warnings. */
1406 /* Don't print warning messages. -w. */
1408 int inhibit_warnings = 0;
1410 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1412 int warn_system_headers = 0;
1414 /* Print various extra warnings. -W. */
1416 int extra_warnings = 0;
1418 /* Treat warnings as errors. -Werror. */
1420 int warnings_are_errors = 0;
1422 /* Nonzero to warn about unused variables, functions et.al. */
1424 int warn_unused_function;
1425 int warn_unused_label;
1426 int warn_unused_parameter;
1427 int warn_unused_variable;
1428 int warn_unused_value;
1430 /* Nonzero to warn about code which is never reached. */
1432 int warn_notreached;
1434 /* Nonzero to warn about variables used before they are initialized. */
1436 int warn_uninitialized;
1438 /* Nonzero means warn about all declarations which shadow others. */
1442 /* Warn if a switch on an enum, that does not have a default case,
1443 fails to have a case for every enum value. */
1447 /* Warn if a switch does not have a default case. */
1449 int warn_switch_default;
1451 /* Warn if a switch on an enum fails to have a case for every enum
1452 value (regardless of the presence or otherwise of a default case). */
1454 int warn_switch_enum;
1456 /* Nonzero means warn about function definitions that default the return type
1457 or that use a null return and have a return-type other than void. */
1459 int warn_return_type;
1461 /* Nonzero means warn about pointer casts that increase the required
1462 alignment of the target type (and might therefore lead to a crash
1463 due to a misaligned access). */
1465 int warn_cast_align;
1467 /* Nonzero means warn about any objects definitions whose size is larger
1468 than N bytes. Also want about function definitions whose returned
1469 values are larger than N bytes. The value N is in `larger_than_size'. */
1471 int warn_larger_than;
1472 HOST_WIDE_INT larger_than_size;
1474 /* Nonzero means warn if inline function is too large. */
1478 /* Warn if a function returns an aggregate,
1479 since there are often incompatible calling conventions for doing this. */
1481 int warn_aggregate_return;
1483 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1487 /* Warn when gcc pads a structure to an alignment boundary. */
1491 /* Warn when an optimization pass is disabled. */
1493 int warn_disabled_optimization;
1495 /* Warn about functions which might be candidates for attribute noreturn. */
1497 int warn_missing_noreturn;
1499 /* Nonzero means warn about uses of __attribute__((deprecated))
1502 int warn_deprecated_decl = 1;
1504 /* Likewise for -W. */
1506 static const lang_independent_options W_options[] =
1508 {"unused-function", &warn_unused_function, 1,
1509 N_("Warn when a function is unused") },
1510 {"unused-label", &warn_unused_label, 1,
1511 N_("Warn when a label is unused") },
1512 {"unused-parameter", &warn_unused_parameter, 1,
1513 N_("Warn when a function parameter is unused") },
1514 {"unused-variable", &warn_unused_variable, 1,
1515 N_("Warn when a variable is unused") },
1516 {"unused-value", &warn_unused_value, 1,
1517 N_("Warn when an expression value is unused") },
1518 {"system-headers", &warn_system_headers, 1,
1519 N_("Do not suppress warnings from system headers") },
1520 {"error", &warnings_are_errors, 1,
1521 N_("Treat all warnings as errors") },
1522 {"shadow", &warn_shadow, 1,
1523 N_("Warn when one local variable shadows another") },
1524 {"switch", &warn_switch, 1,
1525 N_("Warn about enumerated switches, with no default, missing a case") },
1526 {"switch-default", &warn_switch_default, 1,
1527 N_("Warn about enumerated switches missing a default case") },
1528 {"switch-enum", &warn_switch_enum, 1,
1529 N_("Warn about all enumerated switches missing a specific case") },
1530 {"aggregate-return", &warn_aggregate_return, 1,
1531 N_("Warn about returning structures, unions or arrays") },
1532 {"cast-align", &warn_cast_align, 1,
1533 N_("Warn about pointer casts which increase alignment") },
1534 {"unreachable-code", &warn_notreached, 1,
1535 N_("Warn about code that will never be executed") },
1536 {"uninitialized", &warn_uninitialized, 1,
1537 N_("Warn about uninitialized automatic variables") },
1538 {"inline", &warn_inline, 1,
1539 N_("Warn when an inlined function cannot be inlined") },
1540 {"packed", &warn_packed, 1,
1541 N_("Warn when the packed attribute has no effect on struct layout") },
1542 {"padded", &warn_padded, 1,
1543 N_("Warn when padding is required to align struct members") },
1544 {"disabled-optimization", &warn_disabled_optimization, 1,
1545 N_("Warn when an optimization pass is disabled") },
1546 {"deprecated-declarations", &warn_deprecated_decl, 1,
1547 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1548 {"missing-noreturn", &warn_missing_noreturn, 1,
1549 N_("Warn about functions which might be candidates for attribute noreturn") }
1553 set_Wunused (setting)
1556 warn_unused_function = setting;
1557 warn_unused_label = setting;
1558 /* Unused function parameter warnings are reported when either ``-W
1559 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1560 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1562 warn_unused_parameter = 0;
1563 else if (!warn_unused_parameter)
1564 warn_unused_parameter = -1;
1565 warn_unused_variable = setting;
1566 warn_unused_value = setting;
1569 /* The following routines are useful in setting all the flags that
1570 -ffast-math and -fno-fast-math imply. */
1573 set_fast_math_flags (set)
1576 flag_trapping_math = !set;
1577 flag_unsafe_math_optimizations = set;
1578 flag_errno_math = !set;
1580 flag_signaling_nans = 0;
1583 /* Return true iff flags are set as if -ffast-math. */
1585 fast_math_flags_set_p ()
1587 return (!flag_trapping_math
1588 && flag_unsafe_math_optimizations
1589 && !flag_errno_math);
1593 /* Output files for assembler code (real compiler output)
1594 and debugging dumps. */
1597 FILE *aux_info_file;
1598 FILE *rtl_dump_file = NULL;
1600 /* Decode the string P as an integral parameter.
1601 If the string is indeed an integer return its numeric value else
1602 issue an Invalid Option error for the option PNAME and return DEFVAL.
1603 If PNAME is zero just return DEFVAL, do not call error. */
1606 read_integral_parameter (p, pname, defval)
1611 const char *endp = p;
1615 if (ISDIGIT (*endp))
1624 error ("invalid option `%s'", pname);
1631 /* This calls abort and is used to avoid problems when abort if a macro.
1632 It is used when we need to pass the address of abort. */
1640 /* When `malloc.c' is compiled with `rcheck' defined,
1641 it calls this function to report clobberage. */
1645 const char *s ATTRIBUTE_UNUSED;
1650 /* Return the logarithm of X, base 2, considering X unsigned,
1651 if X is a power of 2. Otherwise, returns -1.
1653 This should be used via the `exact_log2' macro. */
1657 unsigned HOST_WIDE_INT x;
1660 /* Test for 0 or a power of 2. */
1661 if (x == 0 || x != (x & -x))
1663 while ((x >>= 1) != 0)
1668 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1669 If X is 0, return -1.
1671 This should be used via the floor_log2 macro. */
1675 unsigned HOST_WIDE_INT x;
1684 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1685 into ICE messages, which is much more user friendly. */
1688 crash_signal (signo)
1691 internal_error ("internal error: %s", strsignal (signo));
1694 /* Strip off a legitimate source ending from the input string NAME of
1695 length LEN. Rather than having to know the names used by all of
1696 our front ends, we strip off an ending of a period followed by
1697 up to five characters. (Java uses ".class".) */
1700 strip_off_ending (name, len)
1705 for (i = 2; i < 6 && len > i; i++)
1707 if (name[len - i] == '.')
1709 name[len - i] = '\0';
1715 /* Output a quoted string. */
1718 output_quoted_string (asm_file, string)
1722 #ifdef OUTPUT_QUOTED_STRING
1723 OUTPUT_QUOTED_STRING (asm_file, string);
1727 putc ('\"', asm_file);
1728 while ((c = *string++) != 0)
1732 if (c == '\"' || c == '\\')
1733 putc ('\\', asm_file);
1737 fprintf (asm_file, "\\%03o", (unsigned char) c);
1739 putc ('\"', asm_file);
1743 /* Output NAME into FILE after having turned it into something
1744 usable as an identifier in a target's assembly file. */
1746 output_clean_symbol_name (file, name)
1750 /* Make a copy of NAME. */
1751 char *id = xstrdup (name);
1753 /* Make it look like a valid identifier for an assembler. */
1754 clean_symbol_name (id);
1761 /* Output a file name in the form wanted by System V. */
1764 output_file_directive (asm_file, input_name)
1766 const char *input_name;
1768 int len = strlen (input_name);
1769 const char *na = input_name + len;
1771 /* NA gets INPUT_NAME sans directory names. */
1772 while (na > input_name)
1774 if (IS_DIR_SEPARATOR (na[-1]))
1779 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1780 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1782 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1783 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1785 fprintf (asm_file, "\t.file\t");
1786 output_quoted_string (asm_file, na);
1787 fputc ('\n', asm_file);
1792 /* Routine to open a dump file. Return true if the dump file is enabled. */
1795 open_dump_file (index, decl)
1796 enum dump_file_index index;
1800 const char *open_arg;
1803 if (! dump_file[index].enabled)
1806 timevar_push (TV_DUMP);
1807 if (rtl_dump_file != NULL)
1808 fclose (rtl_dump_file);
1810 sprintf (seq, DUMPFILE_FORMAT, index);
1812 if (! dump_file[index].initialized)
1814 /* If we've not initialized the files, do so now. */
1815 if (graph_dump_format != no_graph
1816 && dump_file[index].graph_dump_p)
1818 dump_name = concat (seq, dump_file[index].extension, NULL);
1819 clean_graph_dump_file (dump_base_name, dump_name);
1822 dump_file[index].initialized = 1;
1828 dump_name = concat (dump_base_name, seq,
1829 dump_file[index].extension, NULL);
1831 rtl_dump_file = fopen (dump_name, open_arg);
1832 if (rtl_dump_file == NULL)
1833 fatal_io_error ("can't open %s", dump_name);
1838 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1839 (*lang_hooks.decl_printable_name) (decl, 2),
1840 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1842 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1843 ? " (unlikely executed)"
1846 timevar_pop (TV_DUMP);
1850 /* Routine to close a dump file. */
1853 close_dump_file (index, func, insns)
1854 enum dump_file_index index;
1855 void (*func) PARAMS ((FILE *, rtx));
1858 if (! rtl_dump_file)
1861 timevar_push (TV_DUMP);
1863 && graph_dump_format != no_graph
1864 && dump_file[index].graph_dump_p)
1869 sprintf (seq, DUMPFILE_FORMAT, index);
1870 suffix = concat (seq, dump_file[index].extension, NULL);
1871 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1876 func (rtl_dump_file, insns);
1878 fflush (rtl_dump_file);
1879 fclose (rtl_dump_file);
1881 rtl_dump_file = NULL;
1882 timevar_pop (TV_DUMP);
1885 /* Do any final processing required for the declarations in VEC, of
1886 which there are LEN. We write out inline functions and variables
1887 that have been deferred until this point, but which are required.
1888 Returns non-zero if anything was put out. */
1891 wrapup_global_declarations (vec, len)
1898 int output_something = 0;
1900 for (i = 0; i < len; i++)
1904 /* We're not deferring this any longer. */
1905 DECL_DEFER_OUTPUT (decl) = 0;
1907 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1908 (*lang_hooks.finish_incomplete_decl) (decl);
1911 /* Now emit any global variables or functions that we have been
1912 putting off. We need to loop in case one of the things emitted
1913 here references another one which comes earlier in the list. */
1917 for (i = 0; i < len; i++)
1921 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1924 /* Don't write out static consts, unless we still need them.
1926 We also keep static consts if not optimizing (for debugging),
1927 unless the user specified -fno-keep-static-consts.
1928 ??? They might be better written into the debug information.
1929 This is possible when using DWARF.
1931 A language processor that wants static constants to be always
1932 written out (even if it is not used) is responsible for
1933 calling rest_of_decl_compilation itself. E.g. the C front-end
1934 calls rest_of_decl_compilation from finish_decl.
1935 One motivation for this is that is conventional in some
1936 environments to write things like:
1937 static const char rcsid[] = "... version string ...";
1938 intending to force the string to be in the executable.
1940 A language processor that would prefer to have unneeded
1941 static constants "optimized away" would just defer writing
1942 them out until here. E.g. C++ does this, because static
1943 constants are often defined in header files.
1945 ??? A tempting alternative (for both C and C++) would be
1946 to force a constant to be written if and only if it is
1947 defined in a main file, as opposed to an include file. */
1949 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1953 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1955 else if (DECL_COMDAT (decl))
1957 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1958 && (optimize || !flag_keep_static_consts
1959 || DECL_ARTIFICIAL (decl)))
1965 rest_of_decl_compilation (decl, NULL, 1, 1);
1969 if (TREE_CODE (decl) == FUNCTION_DECL
1970 && DECL_INITIAL (decl) != 0
1971 && DECL_SAVED_INSNS (decl) != 0
1972 && (flag_keep_inline_functions
1973 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1974 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1977 output_inline_function (decl);
1982 output_something = 1;
1986 return output_something;
1989 /* Issue appropriate warnings for the global declarations in VEC (of
1990 which there are LEN). Output debugging information for them. */
1993 check_global_declarations (vec, len)
2000 for (i = 0; i < len; i++)
2004 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2005 && ! TREE_ASM_WRITTEN (decl))
2006 /* Cancel the RTL for this decl so that, if debugging info
2007 output for global variables is still to come,
2008 this one will be omitted. */
2009 SET_DECL_RTL (decl, NULL_RTX);
2011 /* Warn about any function
2012 declared static but not defined.
2013 We don't warn about variables,
2014 because many programs have static variables
2015 that exist only to get some text into the object file. */
2016 if (TREE_CODE (decl) == FUNCTION_DECL
2017 && (warn_unused_function
2018 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2019 && DECL_INITIAL (decl) == 0
2020 && DECL_EXTERNAL (decl)
2021 && ! DECL_ARTIFICIAL (decl)
2022 && ! TREE_PUBLIC (decl))
2024 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2025 pedwarn_with_decl (decl,
2026 "`%s' used but never defined");
2028 warning_with_decl (decl,
2029 "`%s' declared `static' but never defined");
2030 /* This symbol is effectively an "extern" declaration now. */
2031 TREE_PUBLIC (decl) = 1;
2032 assemble_external (decl);
2035 /* Warn about static fns or vars defined but not used. */
2036 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2037 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2038 && ! TREE_USED (decl)
2039 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2040 to handle multiple external decls in different scopes. */
2041 && ! TREE_USED (DECL_NAME (decl))
2042 && ! DECL_EXTERNAL (decl)
2043 && ! TREE_PUBLIC (decl)
2044 /* Global register variables must be declared to reserve them. */
2045 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2046 /* Otherwise, ask the language. */
2047 && (*lang_hooks.decls.warn_unused_global) (decl))
2048 warning_with_decl (decl, "`%s' defined but not used");
2050 timevar_push (TV_SYMOUT);
2051 (*debug_hooks->global_decl) (decl);
2052 timevar_pop (TV_SYMOUT);
2056 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2057 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2058 INPUT_FILENAME and LINENO accordingly. */
2061 push_srcloc (file, line)
2065 struct file_stack *fs;
2067 if (input_file_stack)
2069 input_file_stack->name = input_filename;
2070 input_file_stack->line = lineno;
2073 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2074 fs->name = input_filename = file;
2075 fs->line = lineno = line;
2076 fs->next = input_file_stack;
2077 input_file_stack = fs;
2078 input_file_stack_tick++;
2081 /* Pop the top entry off the stack of presently open source files.
2082 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2088 struct file_stack *fs;
2090 fs = input_file_stack;
2091 input_file_stack = fs->next;
2093 input_file_stack_tick++;
2094 /* The initial source file is never popped. */
2095 if (!input_file_stack)
2097 input_filename = input_file_stack->name;
2098 lineno = input_file_stack->line;
2101 /* Compile an entire translation unit. Write a file of assembly
2102 output and various debugging dumps. */
2109 /* Initialize yet another pass. */
2111 init_final (main_input_filename);
2112 init_branch_prob (dump_base_name);
2114 timevar_push (TV_PARSE);
2116 /* Call the parser, which parses the entire file (calling
2117 rest_of_compilation for each function). */
2118 (*lang_hooks.parse_file) (set_yydebug);
2120 /* In case there were missing block closers,
2121 get us back to the global binding level. */
2122 (*lang_hooks.clear_binding_stack) ();
2124 /* Compilation is now finished except for writing
2125 what's left of the symbol table output. */
2126 timevar_pop (TV_PARSE);
2128 if (flag_syntax_only)
2131 globals = (*lang_hooks.decls.getdecls) ();
2133 /* Really define vars that have had only a tentative definition.
2134 Really output inline functions that must actually be callable
2135 and have not been output so far. */
2138 int len = list_length (globals);
2139 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2143 /* Process the decls in reverse order--earliest first.
2144 Put them into VEC from back to front, then take out from front. */
2146 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2147 vec[len - i - 1] = decl;
2149 wrapup_global_declarations (vec, len);
2151 /* This must occur after the loop to output deferred functions. Else
2152 the profiler initializer would not be emitted if all the functions
2153 in this compilation unit were deferred.
2155 output_func_start_profiler can not cause any additional functions or
2156 data to need to be output, so it need not be in the deferred function
2158 output_func_start_profiler ();
2160 check_global_declarations (vec, len);
2166 /* Write out any pending weak symbol declarations. */
2170 /* Do dbx symbols. */
2171 timevar_push (TV_SYMOUT);
2173 #ifdef DWARF2_UNWIND_INFO
2174 if (dwarf2out_do_frame ())
2175 dwarf2out_frame_finish ();
2178 (*debug_hooks->finish) (main_input_filename);
2179 timevar_pop (TV_SYMOUT);
2181 /* Output some stuff at end of file if nec. */
2183 dw2_output_indirect_constants ();
2185 end_final (dump_base_name);
2187 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2189 timevar_push (TV_DUMP);
2190 open_dump_file (DFI_bp, NULL);
2194 close_dump_file (DFI_bp, NULL, NULL_RTX);
2195 timevar_pop (TV_DUMP);
2199 ASM_FILE_END (asm_out_file);
2202 /* Attach a special .ident directive to the end of the file to identify
2203 the version of GCC which compiled this code. The format of the .ident
2204 string is patterned after the ones produced by native SVR4 compilers. */
2207 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2208 IDENT_ASM_OP, version_string);
2211 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2213 timevar_push (TV_DUMP);
2214 dump_combine_total_stats (rtl_dump_file);
2215 close_dump_file (DFI_combine, NULL, NULL_RTX);
2216 timevar_pop (TV_DUMP);
2220 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2221 and TYPE_DECL nodes.
2223 This does nothing for local (non-static) variables, unless the
2224 variable is a register variable with an ASMSPEC. In that case, or
2225 if the variable is not an automatic, it sets up the RTL and
2226 outputs any assembler code (label definition, storage allocation
2227 and initialization).
2229 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2230 the assembler symbol name to be used. TOP_LEVEL is nonzero
2231 if this declaration is not within a function. */
2234 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2236 const char *asmspec;
2240 /* Declarations of variables, and of functions defined elsewhere. */
2242 /* The most obvious approach, to put an #ifndef around where
2243 this macro is used, doesn't work since it's inside a macro call. */
2244 #ifndef ASM_FINISH_DECLARE_OBJECT
2245 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2248 /* We deferred calling assemble_alias so that we could collect
2249 other attributes such as visibility. Emit the alias now. */
2252 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2255 alias = TREE_VALUE (TREE_VALUE (alias));
2256 alias = get_identifier (TREE_STRING_POINTER (alias));
2257 assemble_alias (decl, alias);
2261 /* Forward declarations for nested functions are not "external",
2262 but we need to treat them as if they were. */
2263 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2264 || TREE_CODE (decl) == FUNCTION_DECL)
2266 timevar_push (TV_VARCONST);
2269 make_decl_rtl (decl, asmspec);
2271 /* Don't output anything when a tentative file-scope definition
2272 is seen. But at end of compilation, do output code for them. */
2273 if (at_end || !DECL_DEFER_OUTPUT (decl))
2274 assemble_variable (decl, top_level, at_end, 0);
2275 if (decl == last_assemble_variable_decl)
2277 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2281 timevar_pop (TV_VARCONST);
2283 else if (DECL_REGISTER (decl) && asmspec != 0)
2285 if (decode_reg_name (asmspec) >= 0)
2287 SET_DECL_RTL (decl, NULL_RTX);
2288 make_decl_rtl (decl, asmspec);
2292 error ("invalid register name `%s' for register variable", asmspec);
2293 DECL_REGISTER (decl) = 0;
2298 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2299 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2300 && TREE_CODE (decl) == TYPE_DECL)
2302 timevar_push (TV_SYMOUT);
2303 dbxout_symbol (decl, 0);
2304 timevar_pop (TV_SYMOUT);
2307 #ifdef SDB_DEBUGGING_INFO
2308 else if (write_symbols == SDB_DEBUG && top_level
2309 && TREE_CODE (decl) == TYPE_DECL)
2311 timevar_push (TV_SYMOUT);
2312 sdbout_symbol (decl, 0);
2313 timevar_pop (TV_SYMOUT);
2318 /* Called after finishing a record, union or enumeral type. */
2321 rest_of_type_compilation (type, toplev)
2322 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2326 tree type ATTRIBUTE_UNUSED;
2327 int toplev ATTRIBUTE_UNUSED;
2330 timevar_push (TV_SYMOUT);
2331 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2332 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2333 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2335 #ifdef SDB_DEBUGGING_INFO
2336 if (write_symbols == SDB_DEBUG)
2337 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2339 #ifdef DWARF2_DEBUGGING_INFO
2340 if ((write_symbols == DWARF2_DEBUG
2341 || write_symbols == VMS_AND_DWARF2_DEBUG)
2343 dwarf2out_decl (TYPE_STUB_DECL (type));
2345 timevar_pop (TV_SYMOUT);
2348 /* This is called from finish_function (within langhooks.parse_file)
2349 after each top-level definition is parsed.
2350 It is supposed to compile that function or variable
2351 and output the assembler code for it.
2352 After we return, the tree storage is freed. */
2355 rest_of_compilation (decl)
2361 int rebuild_label_notes_after_reload;
2362 int register_life_up_to_date;
2364 timevar_push (TV_REST_OF_COMPILATION);
2366 /* Now that we're out of the frontend, we shouldn't have any more
2367 CONCATs anywhere. */
2368 generating_concat_p = 0;
2370 /* When processing delayed functions, prepare_function_start() won't
2371 have been run to re-initialize it. */
2372 cse_not_expected = ! optimize;
2374 /* First, make sure that NOTE_BLOCK is set correctly for each
2375 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2376 if (!cfun->x_whole_function_mode_p)
2379 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2380 tree in sensible shape. So, we just recalculate it here. */
2381 if (cfun->x_whole_function_mode_p)
2386 /* If we are reconsidering an inline function
2387 at the end of compilation, skip the stuff for making it inline. */
2389 if (DECL_SAVED_INSNS (decl) == 0)
2395 /* If this is nested inside an inlined external function, pretend
2396 it was only declared. Since we cannot inline such functions,
2397 generating code for this one is not only not necessary but will
2398 confuse some debugging output writers. */
2399 for (parent = DECL_CONTEXT (current_function_decl);
2400 parent != NULL_TREE;
2401 parent = get_containing_scope (parent))
2402 if (TREE_CODE (parent) == FUNCTION_DECL
2403 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2405 DECL_INITIAL (decl) = 0;
2406 goto exit_rest_of_compilation;
2409 /* If requested, consider whether to make this function inline. */
2410 if ((DECL_INLINE (decl) && !flag_no_inline)
2411 || flag_inline_functions)
2413 timevar_push (TV_INTEGRATION);
2414 lose = function_cannot_inline_p (decl);
2415 timevar_pop (TV_INTEGRATION);
2416 if (lose || ! optimize)
2418 if (warn_inline && DECL_INLINE (decl))
2419 warning_with_decl (decl, lose);
2420 DECL_ABSTRACT_ORIGIN (decl) = 0;
2421 /* Don't really compile an extern inline function.
2422 If we can't make it inline, pretend
2423 it was only declared. */
2424 if (DECL_EXTERNAL (decl))
2426 DECL_INITIAL (decl) = 0;
2427 goto exit_rest_of_compilation;
2431 /* ??? Note that this has the effect of making it look
2432 like "inline" was specified for a function if we choose
2433 to inline it. This isn't quite right, but it's
2434 probably not worth the trouble to fix. */
2435 inlinable = DECL_INLINE (decl) = 1;
2438 insns = get_insns ();
2440 /* Dump the rtl code if we are dumping rtl. */
2442 if (open_dump_file (DFI_rtl, decl))
2444 if (DECL_SAVED_INSNS (decl))
2445 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2446 close_dump_file (DFI_rtl, print_rtl, insns);
2449 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2450 sorts of eh initialization. Delay this until after the
2451 initial rtl dump so that we can see the original nesting. */
2452 convert_from_eh_region_ranges ();
2454 /* If function is inline, and we don't yet know whether to
2455 compile it by itself, defer decision till end of compilation.
2456 finish_compilation will call rest_of_compilation again
2457 for those functions that need to be output. Also defer those
2458 functions that we are supposed to defer. */
2461 || (DECL_INLINE (decl)
2462 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2463 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2464 && ! flag_keep_inline_functions)
2465 || DECL_EXTERNAL (decl))))
2466 DECL_DEFER_OUTPUT (decl) = 1;
2468 if (DECL_INLINE (decl))
2469 /* DWARF wants separate debugging info for abstract and
2470 concrete instances of all inline functions, including those
2471 declared inline but not inlined, and those inlined even
2472 though they weren't declared inline. Conveniently, that's
2473 what DECL_INLINE means at this point. */
2474 (*debug_hooks->deferred_inline_function) (decl);
2476 if (DECL_DEFER_OUTPUT (decl))
2478 /* If -Wreturn-type, we have to do a bit of compilation. We just
2479 want to call cleanup the cfg to figure out whether or not we can
2480 fall off the end of the function; we do the minimum amount of
2481 work necessary to make that safe. */
2482 if (warn_return_type)
2484 int saved_optimize = optimize;
2487 rebuild_jump_labels (insns);
2488 find_exception_handler_labels ();
2489 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2490 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2491 optimize = saved_optimize;
2493 /* CFG is no longer maintained up-to-date. */
2494 free_bb_for_insn ();
2497 current_function_nothrow = nothrow_function_p ();
2498 if (current_function_nothrow)
2499 /* Now we know that this can't throw; set the flag for the benefit
2500 of other functions later in this translation unit. */
2501 TREE_NOTHROW (current_function_decl) = 1;
2503 timevar_push (TV_INTEGRATION);
2504 save_for_inline (decl);
2505 timevar_pop (TV_INTEGRATION);
2506 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2507 goto exit_rest_of_compilation;
2510 /* If specified extern inline but we aren't inlining it, we are
2511 done. This goes for anything that gets here with DECL_EXTERNAL
2512 set, not just things with DECL_INLINE. */
2513 if (DECL_EXTERNAL (decl))
2514 goto exit_rest_of_compilation;
2517 /* If we're emitting a nested function, make sure its parent gets
2518 emitted as well. Doing otherwise confuses debug info. */
2521 for (parent = DECL_CONTEXT (current_function_decl);
2522 parent != NULL_TREE;
2523 parent = get_containing_scope (parent))
2524 if (TREE_CODE (parent) == FUNCTION_DECL)
2525 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2528 /* We are now committed to emitting code for this function. Do any
2529 preparation, such as emitting abstract debug info for the inline
2530 before it gets mangled by optimization. */
2531 if (DECL_INLINE (decl))
2532 (*debug_hooks->outlining_inline_function) (decl);
2534 /* Remove any notes we don't need. That will make iterating
2535 over the instruction sequence faster, and allow the garbage
2536 collector to reclaim the memory used by the notes. */
2537 remove_unnecessary_notes ();
2542 /* Initialize some variables used by the optimizers. */
2543 init_function_for_compilation ();
2545 if (! DECL_DEFER_OUTPUT (decl))
2546 TREE_ASM_WRITTEN (decl) = 1;
2548 /* Now that integrate will no longer see our rtl, we need not
2549 distinguish between the return value of this function and the
2550 return value of called functions. Also, we can remove all SETs
2551 of subregs of hard registers; they are only here because of
2552 integrate. Also, we can now initialize pseudos intended to
2553 carry magic hard reg data throughout the function. */
2554 rtx_equal_function_value_matters = 0;
2555 purge_hard_subreg_sets (get_insns ());
2557 /* Early return if there were errors. We can run afoul of our
2558 consistency checks, and there's not really much point in fixing them.
2559 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2560 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2561 || errorcount || sorrycount)
2562 goto exit_rest_of_compilation;
2564 timevar_push (TV_JUMP);
2565 open_dump_file (DFI_sibling, decl);
2566 insns = get_insns ();
2567 rebuild_jump_labels (insns);
2568 find_exception_handler_labels ();
2569 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2571 delete_unreachable_blocks ();
2573 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2574 note_prediction_to_br_prob ();
2576 /* We may have potential sibling or tail recursion sites. Select one
2577 (of possibly multiple) methods of performing the call. */
2578 if (flag_optimize_sibling_calls)
2581 optimize_sibling_and_tail_recursive_calls ();
2583 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2584 free_bb_for_insn ();
2585 find_exception_handler_labels ();
2586 rebuild_jump_labels (insns);
2587 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2589 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2590 notes before simplifying cfg and we must do lowering after sibcall
2591 that unhides parts of RTL chain and cleans up the CFG.
2593 Until sibcall is replaced by tree-level optimizer, lets just
2594 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2595 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2596 if (GET_CODE (insn) == NOTE
2597 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2600 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2601 timevar_pop (TV_JUMP);
2603 scope_to_insns_initialize ();
2604 /* Complete generation of exception handling code. */
2607 timevar_push (TV_JUMP);
2608 open_dump_file (DFI_eh, decl);
2610 finish_eh_generation ();
2612 close_dump_file (DFI_eh, print_rtl, get_insns ());
2613 timevar_pop (TV_JUMP);
2616 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2617 generation, which might create new sets. */
2618 emit_initial_value_sets ();
2621 /* If we are doing position-independent code generation, now
2622 is the time to output special prologues and epilogues.
2623 We do not want to do this earlier, because it just clutters
2624 up inline functions with meaningless insns. */
2629 insns = get_insns ();
2631 /* Copy any shared structure that should not be shared. */
2632 unshare_all_rtl (current_function_decl, insns);
2634 #ifdef SETJMP_VIA_SAVE_AREA
2635 /* This must be performed before virtual register instantiation.
2636 Please be aware the everything in the compiler that can look
2637 at the RTL up to this point must understand that REG_SAVE_AREA
2638 is just like a use of the REG contained inside. */
2639 if (current_function_calls_alloca)
2640 optimize_save_area_alloca (insns);
2643 /* Instantiate all virtual registers. */
2644 instantiate_virtual_regs (current_function_decl, insns);
2646 open_dump_file (DFI_jump, decl);
2648 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2649 are initialized and to compute whether control can drop off the end
2652 timevar_push (TV_JUMP);
2653 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2654 before jump optimization switches branch directions. */
2655 expected_value_to_br_prob ();
2657 reg_scan (insns, max_reg_num (), 0);
2658 rebuild_jump_labels (insns);
2659 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2661 dump_flow_info (rtl_dump_file);
2662 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2663 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2665 /* CFG is no longer maintained up-to-date. */
2666 free_bb_for_insn ();
2667 copy_loop_headers (insns);
2668 purge_line_number_notes (insns);
2669 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2671 timevar_pop (TV_JUMP);
2672 close_dump_file (DFI_jump, print_rtl, insns);
2674 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2675 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2677 goto exit_rest_of_compilation;
2680 /* Long term, this should probably move before the jump optimizer too,
2681 but I didn't want to disturb the rtl_dump_and_exit and related
2682 stuff at this time. */
2683 if (optimize > 0 && flag_ssa)
2685 /* Convert to SSA form. */
2687 timevar_push (TV_TO_SSA);
2688 open_dump_file (DFI_ssa, decl);
2690 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2693 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2694 timevar_pop (TV_TO_SSA);
2696 /* Perform sparse conditional constant propagation, if requested. */
2699 timevar_push (TV_SSA_CCP);
2700 open_dump_file (DFI_ssa_ccp, decl);
2704 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2705 timevar_pop (TV_SSA_CCP);
2708 /* It would be useful to cleanup the CFG at this point, but block
2709 merging and possibly other transformations might leave a PHI
2710 node in the middle of a basic block, which is a strict no-no. */
2712 /* The SSA implementation uses basic block numbers in its phi
2713 nodes. Thus, changing the control-flow graph or the basic
2714 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2715 may cause problems. */
2719 /* Remove dead code. */
2721 timevar_push (TV_SSA_DCE);
2722 open_dump_file (DFI_ssa_dce, decl);
2724 insns = get_insns ();
2725 ssa_eliminate_dead_code ();
2727 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2728 timevar_pop (TV_SSA_DCE);
2731 /* Convert from SSA form. */
2733 timevar_push (TV_FROM_SSA);
2734 open_dump_file (DFI_ussa, decl);
2736 convert_from_ssa ();
2737 /* New registers have been created. Rescan their usage. */
2738 reg_scan (insns, max_reg_num (), 1);
2740 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2741 timevar_pop (TV_FROM_SSA);
2746 timevar_push (TV_JUMP);
2747 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP: 0);
2749 /* Try to identify useless null pointer tests and delete them. */
2750 if (flag_delete_null_pointer_checks)
2752 open_dump_file (DFI_null, decl);
2754 dump_flow_info (rtl_dump_file);
2756 if (delete_null_pointer_checks (insns))
2757 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2759 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2762 /* Jump optimization, and the removal of NULL pointer checks, may
2763 have reduced the number of instructions substantially. CSE, and
2764 future passes, allocate arrays whose dimensions involve the
2765 maximum instruction UID, so if we can reduce the maximum UID
2766 we'll save big on memory. */
2767 renumber_insns (rtl_dump_file);
2768 timevar_pop (TV_JUMP);
2770 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2774 /* Perform common subexpression elimination.
2775 Nonzero value from `cse_main' means that jumps were simplified
2776 and some code may now be unreachable, so do
2777 jump optimization again. */
2781 open_dump_file (DFI_cse, decl);
2783 dump_flow_info (rtl_dump_file);
2784 timevar_push (TV_CSE);
2786 reg_scan (insns, max_reg_num (), 1);
2788 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2790 rebuild_jump_labels (insns);
2791 purge_all_dead_edges (0);
2793 delete_trivially_dead_insns (insns, max_reg_num ());
2795 /* If we are not running more CSE passes, then we are no longer
2796 expecting CSE to be run. But always rerun it in a cheap mode. */
2797 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2799 if (tem || optimize > 1)
2800 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2801 /* Try to identify useless null pointer tests and delete them. */
2802 if (flag_delete_null_pointer_checks)
2804 timevar_push (TV_JUMP);
2806 if (delete_null_pointer_checks (insns))
2807 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2808 timevar_pop (TV_JUMP);
2811 /* The second pass of jump optimization is likely to have
2812 removed a bunch more instructions. */
2813 renumber_insns (rtl_dump_file);
2815 timevar_pop (TV_CSE);
2816 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2819 open_dump_file (DFI_addressof, decl);
2821 purge_addressof (insns);
2823 purge_all_dead_edges (0);
2824 reg_scan (insns, max_reg_num (), 1);
2826 close_dump_file (DFI_addressof, print_rtl, insns);
2830 /* Perform global cse. */
2832 if (optimize > 0 && flag_gcse)
2834 int save_csb, save_cfj;
2837 timevar_push (TV_GCSE);
2838 open_dump_file (DFI_gcse, decl);
2840 tem = gcse_main (insns, rtl_dump_file);
2841 rebuild_jump_labels (insns);
2842 delete_trivially_dead_insns (insns, max_reg_num ());
2844 save_csb = flag_cse_skip_blocks;
2845 save_cfj = flag_cse_follow_jumps;
2846 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2848 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2850 if (flag_expensive_optimizations)
2852 timevar_push (TV_CSE);
2853 reg_scan (insns, max_reg_num (), 1);
2854 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2855 purge_all_dead_edges (0);
2856 delete_trivially_dead_insns (insns, max_reg_num ());
2857 timevar_pop (TV_CSE);
2858 cse_not_expected = !flag_rerun_cse_after_loop;
2861 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2862 things up. Then possibly re-run CSE again. */
2866 timevar_push (TV_JUMP);
2867 rebuild_jump_labels (insns);
2868 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2869 timevar_pop (TV_JUMP);
2871 if (flag_expensive_optimizations)
2873 timevar_push (TV_CSE);
2874 reg_scan (insns, max_reg_num (), 1);
2875 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2876 purge_all_dead_edges (0);
2877 delete_trivially_dead_insns (insns, max_reg_num ());
2878 timevar_pop (TV_CSE);
2882 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2883 timevar_pop (TV_GCSE);
2886 flag_cse_skip_blocks = save_csb;
2887 flag_cse_follow_jumps = save_cfj;
2888 #ifdef ENABLE_CHECKING
2889 verify_flow_info ();
2893 /* Move constant computations out of loops. */
2895 if (optimize > 0 && flag_loop_optimize)
2897 int do_unroll, do_prefetch;
2899 timevar_push (TV_LOOP);
2900 delete_dead_jumptables ();
2901 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2902 open_dump_file (DFI_loop, decl);
2903 /* CFG is no longer maintained up-to-date. */
2904 free_bb_for_insn ();
2906 do_unroll = flag_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2907 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2908 if (flag_rerun_loop_opt)
2910 cleanup_barriers ();
2912 /* We only want to perform unrolling once. */
2913 loop_optimize (insns, rtl_dump_file, do_unroll);
2916 /* The first call to loop_optimize makes some instructions
2917 trivially dead. We delete those instructions now in the
2918 hope that doing so will make the heuristics in loop work
2919 better and possibly speed up compilation. */
2920 delete_trivially_dead_insns (insns, max_reg_num ());
2922 /* The regscan pass is currently necessary as the alias
2923 analysis code depends on this information. */
2924 reg_scan (insns, max_reg_num (), 1);
2926 cleanup_barriers ();
2927 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2929 /* Loop can create trivially dead instructions. */
2930 delete_trivially_dead_insns (insns, max_reg_num ());
2931 close_dump_file (DFI_loop, print_rtl, insns);
2932 timevar_pop (TV_LOOP);
2933 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2938 /* Do control and data flow analysis; wrote some of the results to
2941 timevar_push (TV_FLOW);
2942 open_dump_file (DFI_cfg, decl);
2944 dump_flow_info (rtl_dump_file);
2945 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2946 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2948 /* It may make more sense to mark constant functions after dead code is
2949 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2950 may insert code making function non-constant, but we still must consider
2951 it as constant, otherwise -fbranch-probabilities will not read data back.
2953 life_analyzis rarely eliminates modification of external memory.
2956 mark_constant_function ();
2958 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2960 /* Do branch profiling and static profile estimation passes. */
2961 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
2965 timevar_push (TV_BRANCH_PROB);
2966 open_dump_file (DFI_bp, decl);
2967 if (cfun->arc_profile || flag_branch_probabilities)
2970 /* Discover and record the loop depth at the head of each basic
2971 block. The loop infrastructure does the real job for us. */
2972 flow_loops_find (&loops, LOOP_TREE);
2975 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2977 /* Estimate using heuristics if no profiling info is available. */
2978 if (flag_guess_branch_prob)
2979 estimate_probability (&loops);
2981 flow_loops_free (&loops);
2982 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2983 timevar_pop (TV_BRANCH_PROB);
2987 timevar_push (TV_TRACER);
2988 open_dump_file (DFI_tracer, decl);
2990 dump_flow_info (rtl_dump_file);
2991 cleanup_cfg (CLEANUP_EXPENSIVE);
2993 cleanup_cfg (CLEANUP_EXPENSIVE);
2994 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2995 timevar_pop (TV_TRACER);
2996 reg_scan (get_insns (), max_reg_num (), 0);
3001 timevar_push (TV_CSE2);
3002 open_dump_file (DFI_cse2, decl);
3004 dump_flow_info (rtl_dump_file);
3006 if (flag_rerun_cse_after_loop)
3008 timevar_push (TV_JUMP);
3010 reg_scan (insns, max_reg_num (), 0);
3012 timevar_push (TV_IFCVT);
3013 cleanup_cfg (CLEANUP_EXPENSIVE);
3014 if (flag_if_conversion)
3016 timevar_pop (TV_IFCVT);
3018 timevar_pop (TV_JUMP);
3019 /* CFG is no longer maintained up-to-date. */
3020 reg_scan (insns, max_reg_num (), 0);
3021 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3022 purge_all_dead_edges (0);
3023 delete_trivially_dead_insns (insns, max_reg_num ());
3027 timevar_push (TV_JUMP);
3028 rebuild_jump_labels (insns);
3029 cleanup_cfg (CLEANUP_EXPENSIVE);
3030 timevar_pop (TV_JUMP);
3034 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3035 timevar_pop (TV_CSE2);
3040 cse_not_expected = 1;
3042 open_dump_file (DFI_life, decl);
3045 check_function_return_warnings ();
3047 #ifdef ENABLE_CHECKING
3048 verify_flow_info ();
3050 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3052 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3053 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3054 timevar_pop (TV_FLOW);
3058 if (warn_uninitialized || extra_warnings)
3060 uninitialized_vars_warning (DECL_INITIAL (decl));
3062 setjmp_args_warning ();
3068 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3070 /* Insns were inserted, so things might look a bit different. */
3071 insns = get_insns ();
3072 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3073 PROP_LOG_LINKS | PROP_REG_INFO
3074 | PROP_DEATH_NOTES);
3078 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3082 /* If -opt, try combining insns through substitution. */
3086 int rebuild_jump_labels_after_combine = 0;
3088 timevar_push (TV_COMBINE);
3089 open_dump_file (DFI_combine, decl);
3091 rebuild_jump_labels_after_combine
3092 = combine_instructions (insns, max_reg_num ());
3094 /* Combining insns may have turned an indirect jump into a
3095 direct jump. Rebuid the JUMP_LABEL fields of jumping
3097 if (rebuild_jump_labels_after_combine)
3099 timevar_push (TV_JUMP);
3100 rebuild_jump_labels (insns);
3101 timevar_pop (TV_JUMP);
3103 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3106 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3107 timevar_pop (TV_COMBINE);
3112 /* Rerun if-conversion, as combine may have simplified things enough to
3113 now meet sequence length restrictions. */
3114 if (flag_if_conversion)
3116 timevar_push (TV_IFCVT);
3117 open_dump_file (DFI_ce, decl);
3123 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3124 timevar_pop (TV_IFCVT);
3127 /* Register allocation pre-pass, to reduce number of moves
3128 necessary for two-address machines. */
3129 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3131 timevar_push (TV_REGMOVE);
3132 open_dump_file (DFI_regmove, decl);
3134 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3136 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3137 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3138 timevar_pop (TV_REGMOVE);
3143 /* Do unconditional splitting before register allocation to allow machine
3144 description to add extra information not needed previously. */
3145 split_all_insns (1);
3147 /* Any of the several passes since flow1 will have munged register
3148 lifetime data a bit. */
3149 register_life_up_to_date = 0;
3151 #ifdef OPTIMIZE_MODE_SWITCHING
3152 timevar_push (TV_MODE_SWITCH);
3155 optimize_mode_switching (NULL);
3158 timevar_pop (TV_MODE_SWITCH);
3161 timevar_push (TV_SCHED);
3163 #ifdef INSN_SCHEDULING
3165 /* Print function header into sched dump now
3166 because doing the sched analysis makes some of the dump. */
3167 if (optimize > 0 && flag_schedule_insns)
3169 open_dump_file (DFI_sched, decl);
3171 /* Do control and data sched analysis,
3172 and write some of the results to dump file. */
3174 schedule_insns (rtl_dump_file);
3176 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3178 /* Register lifetime information was updated as part of verifying
3180 register_life_up_to_date = 1;
3183 timevar_pop (TV_SCHED);
3187 /* Determine if the current function is a leaf before running reload
3188 since this can impact optimizations done by the prologue and
3189 epilogue thus changing register elimination offsets. */
3190 current_function_is_leaf = leaf_function_p ();
3192 timevar_push (TV_LOCAL_ALLOC);
3193 open_dump_file (DFI_lreg, decl);
3195 /* Allocate pseudo-regs that are used only within 1 basic block.
3197 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3198 jump optimizer after register allocation and reloading are finished. */
3200 if (! register_life_up_to_date)
3201 recompute_reg_usage (insns, ! optimize_size);
3203 if (flag_new_regalloc)
3205 delete_trivially_dead_insns (insns, max_reg_num ());
3208 timevar_pop (TV_LOCAL_ALLOC);
3209 if (dump_file[DFI_lreg].enabled)
3211 timevar_push (TV_DUMP);
3213 close_dump_file (DFI_lreg, NULL, NULL);
3214 timevar_pop (TV_DUMP);
3217 /* XXX clean up the whole mess to bring live info in shape again. */
3218 timevar_push (TV_GLOBAL_ALLOC);
3219 open_dump_file (DFI_greg, decl);
3221 build_insn_chain (insns);
3222 failure = reload (insns, 0);
3224 timevar_pop (TV_GLOBAL_ALLOC);
3226 if (dump_file[DFI_greg].enabled)
3228 timevar_push (TV_DUMP);
3230 dump_global_regs (rtl_dump_file);
3232 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3233 timevar_pop (TV_DUMP);
3237 goto exit_rest_of_compilation;
3238 reload_completed = 1;
3239 rebuild_label_notes_after_reload = 0;
3243 /* Allocate the reg_renumber array. */
3244 allocate_reg_info (max_regno, FALSE, TRUE);
3246 /* And the reg_equiv_memory_loc array. */
3247 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3249 allocate_initial_values (reg_equiv_memory_loc);
3251 regclass (insns, max_reg_num (), rtl_dump_file);
3252 rebuild_label_notes_after_reload = local_alloc ();
3254 timevar_pop (TV_LOCAL_ALLOC);
3256 if (dump_file[DFI_lreg].enabled)
3258 timevar_push (TV_DUMP);
3260 dump_flow_info (rtl_dump_file);
3261 dump_local_alloc (rtl_dump_file);
3263 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3264 timevar_pop (TV_DUMP);
3269 timevar_push (TV_GLOBAL_ALLOC);
3270 open_dump_file (DFI_greg, decl);
3272 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3273 pass fixing up any insns that are invalid. */
3276 failure = global_alloc (rtl_dump_file);
3279 build_insn_chain (insns);
3280 failure = reload (insns, 0);
3283 timevar_pop (TV_GLOBAL_ALLOC);
3285 if (dump_file[DFI_greg].enabled)
3287 timevar_push (TV_DUMP);
3289 dump_global_regs (rtl_dump_file);
3291 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3292 timevar_pop (TV_DUMP);
3296 goto exit_rest_of_compilation;
3301 open_dump_file (DFI_postreload, decl);
3303 /* Do a very simple CSE pass over just the hard registers. */
3306 timevar_push (TV_RELOAD_CSE_REGS);
3307 reload_cse_regs (insns);
3308 timevar_pop (TV_RELOAD_CSE_REGS);
3311 /* Register allocation and reloading may have turned an indirect jump into
3312 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3313 jumping instructions. */
3314 if (rebuild_label_notes_after_reload)
3316 timevar_push (TV_JUMP);
3318 rebuild_jump_labels (insns);
3319 purge_all_dead_edges (0);
3321 timevar_pop (TV_JUMP);
3324 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3326 /* Re-create the death notes which were deleted during reload. */
3327 timevar_push (TV_FLOW2);
3328 open_dump_file (DFI_flow2, decl);
3330 #ifdef ENABLE_CHECKING
3331 verify_flow_info ();
3334 /* If optimizing, then go ahead and split insns now. */
3336 split_all_insns (0);
3338 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3340 /* On some machines, the prologue and epilogue code, or parts thereof,
3341 can be represented as RTL. Doing so lets us schedule insns between
3342 it and the rest of the code and also allows delayed branch
3343 scheduling to operate in the epilogue. */
3344 thread_prologue_and_epilogue_insns (insns);
3348 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3349 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3350 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3352 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3353 even for machines with possibly nonzero RETURN_POPS_ARGS
3354 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3355 push instructions will have popping returns. */
3356 #ifndef PUSH_ROUNDING
3357 if (!ACCUMULATE_OUTGOING_ARGS)
3359 combine_stack_adjustments ();
3364 flow2_completed = 1;
3366 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3367 timevar_pop (TV_FLOW2);
3369 #ifdef HAVE_peephole2
3370 if (optimize > 0 && flag_peephole2)
3372 timevar_push (TV_PEEPHOLE2);
3373 open_dump_file (DFI_peephole2, decl);
3375 peephole2_optimize (rtl_dump_file);
3377 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3378 timevar_pop (TV_PEEPHOLE2);
3382 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3384 timevar_push (TV_RENAME_REGISTERS);
3385 open_dump_file (DFI_rnreg, decl);
3387 if (flag_rename_registers)
3388 regrename_optimize ();
3389 if (flag_cprop_registers)
3390 copyprop_hardreg_forward ();
3392 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3393 timevar_pop (TV_RENAME_REGISTERS);
3396 if (flag_if_conversion2)
3398 timevar_push (TV_IFCVT2);
3399 open_dump_file (DFI_ce2, decl);
3403 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3404 timevar_pop (TV_IFCVT2);
3408 split_all_insns (1);
3411 #ifdef INSN_SCHEDULING
3412 if (optimize > 0 && flag_schedule_insns_after_reload)
3414 timevar_push (TV_SCHED2);
3415 open_dump_file (DFI_sched2, decl);
3417 /* Do control and data sched analysis again,
3418 and write some more of the results to dump file. */
3420 split_all_insns (1);
3422 schedule_insns (rtl_dump_file);
3424 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3425 timevar_pop (TV_SCHED2);
3431 #ifdef LEAF_REGISTERS
3432 current_function_uses_only_leaf_regs
3433 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3437 timevar_push (TV_REG_STACK);
3438 open_dump_file (DFI_stack, decl);
3440 reg_to_stack (insns, rtl_dump_file);
3442 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3443 timevar_pop (TV_REG_STACK);
3449 timevar_push (TV_REORDER_BLOCKS);
3450 open_dump_file (DFI_bbro, decl);
3452 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3453 splitting possibly introduced more crossjumping oppurtuntities.
3454 Except that we can't actually run crossjumping without running
3455 another DCE pass, which we can't do after reg-stack. */
3456 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3457 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3458 if (flag_reorder_blocks)
3460 reorder_basic_blocks ();
3461 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3464 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3465 timevar_pop (TV_REORDER_BLOCKS);
3467 compute_alignments ();
3469 /* CFG is no longer maintained up-to-date. */
3470 free_bb_for_insn ();
3472 /* If a machine dependent reorganization is needed, call it. */
3473 #ifdef MACHINE_DEPENDENT_REORG
3474 timevar_push (TV_MACH_DEP);
3475 open_dump_file (DFI_mach, decl);
3477 MACHINE_DEPENDENT_REORG (insns);
3479 close_dump_file (DFI_mach, print_rtl, insns);
3480 timevar_pop (TV_MACH_DEP);
3485 purge_line_number_notes (insns);
3486 cleanup_barriers ();
3488 /* If a scheduling pass for delayed branches is to be done,
3489 call the scheduling code. */
3492 if (optimize > 0 && flag_delayed_branch)
3494 timevar_push (TV_DBR_SCHED);
3495 open_dump_file (DFI_dbr, decl);
3497 dbr_schedule (insns, rtl_dump_file);
3499 close_dump_file (DFI_dbr, print_rtl, insns);
3500 timevar_pop (TV_DBR_SCHED);
3506 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3507 timevar_push (TV_SHORTEN_BRANCH);
3508 split_all_insns_noflow ();
3509 timevar_pop (TV_SHORTEN_BRANCH);
3512 convert_to_eh_region_ranges ();
3514 /* Shorten branches. */
3515 timevar_push (TV_SHORTEN_BRANCH);
3516 shorten_branches (get_insns ());
3517 timevar_pop (TV_SHORTEN_BRANCH);
3519 current_function_nothrow = nothrow_function_p ();
3520 if (current_function_nothrow)
3521 /* Now we know that this can't throw; set the flag for the benefit
3522 of other functions later in this translation unit. */
3523 TREE_NOTHROW (current_function_decl) = 1;
3525 /* Now turn the rtl into assembler code. */
3527 timevar_push (TV_FINAL);
3532 /* Get the function's name, as described by its RTL. This may be
3533 different from the DECL_NAME name used in the source file. */
3535 x = DECL_RTL (decl);
3536 if (GET_CODE (x) != MEM)
3539 if (GET_CODE (x) != SYMBOL_REF)
3541 fnname = XSTR (x, 0);
3543 assemble_start_function (decl, fnname);
3544 final_start_function (insns, asm_out_file, optimize);
3545 final (insns, asm_out_file, optimize, 0);
3546 final_end_function ();
3548 #ifdef IA64_UNWIND_INFO
3549 /* ??? The IA-64 ".handlerdata" directive must be issued before
3550 the ".endp" directive that closes the procedure descriptor. */
3551 output_function_exception_table ();
3554 assemble_end_function (decl, fnname);
3556 #ifndef IA64_UNWIND_INFO
3557 /* Otherwise, it feels unclean to switch sections in the middle. */
3558 output_function_exception_table ();
3562 fflush (asm_out_file);
3564 /* Release all memory allocated by flow. */
3565 free_basic_block_vars (0);
3567 /* Release all memory held by regsets now. */
3568 regset_release_memory ();
3570 timevar_pop (TV_FINAL);
3574 /* Write DBX symbols if requested. */
3576 /* Note that for those inline functions where we don't initially
3577 know for certain that we will be generating an out-of-line copy,
3578 the first invocation of this routine (rest_of_compilation) will
3579 skip over this code by doing a `goto exit_rest_of_compilation;'.
3580 Later on, finish_compilation will call rest_of_compilation again
3581 for those inline functions that need to have out-of-line copies
3582 generated. During that call, we *will* be routed past here. */
3584 timevar_push (TV_SYMOUT);
3585 (*debug_hooks->function_decl) (decl);
3586 timevar_pop (TV_SYMOUT);
3588 exit_rest_of_compilation:
3590 /* In case the function was not output,
3591 don't leave any temporary anonymous types
3592 queued up for sdb output. */
3593 #ifdef SDB_DEBUGGING_INFO
3594 if (write_symbols == SDB_DEBUG)
3595 sdbout_types (NULL_TREE);
3598 reload_completed = 0;
3599 flow2_completed = 0;
3602 timevar_push (TV_FINAL);
3604 /* Clear out the insn_length contents now that they are no
3606 init_insn_lengths ();
3608 /* Show no temporary slots allocated. */
3611 free_basic_block_vars (0);
3612 free_bb_for_insn ();
3614 timevar_pop (TV_FINAL);
3616 /* Make sure volatile mem refs aren't considered valid operands for
3617 arithmetic insns. We must call this here if this is a nested inline
3618 function, since the above code leaves us in the init_recog state
3619 (from final.c), and the function context push/pop code does not
3620 save/restore volatile_ok.
3622 ??? Maybe it isn't necessary for expand_start_function to call this
3623 anymore if we do it here? */
3625 init_recog_no_volatile ();
3627 /* We're done with this function. Free up memory if we can. */
3628 free_after_parsing (cfun);
3629 if (! DECL_DEFER_OUTPUT (decl))
3631 free_after_compilation (cfun);
3633 /* Clear integrate.c's pointer to the cfun structure we just
3635 DECL_SAVED_INSNS (decl) = 0;
3641 timevar_pop (TV_REST_OF_COMPILATION);
3651 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3652 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3653 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3654 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3655 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3656 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"));
3657 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3659 for (i = ARRAY_SIZE (f_options); i--;)
3661 const char *description = f_options[i].description;
3663 if (description != NULL && *description != 0)
3664 printf (" -f%-21s %s\n",
3665 f_options[i].string, _(description));
3668 printf (_(" -O[number] Set optimization level to [number]\n"));
3669 printf (_(" -Os Optimize for space rather than speed\n"));
3670 for (i = LAST_PARAM; i--;)
3672 const char *description = compiler_params[i].help;
3673 const int length = 21 - strlen (compiler_params[i].option);
3675 if (description != NULL && *description != 0)
3676 printf (" --param %s=<value>%.*s%s\n",
3677 compiler_params[i].option,
3678 length > 0 ? length : 1, " ",
3681 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3682 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3683 printf (_(" -w Suppress warnings\n"));
3684 printf (_(" -W Enable extra warnings\n"));
3686 for (i = ARRAY_SIZE (W_options); i--;)
3688 const char *description = W_options[i].description;
3690 if (description != NULL && *description != 0)
3691 printf (" -W%-21s %s\n",
3692 W_options[i].string, _(description));
3695 printf (_(" -Wunused Enable unused warnings\n"));
3696 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3697 printf (_(" -p Enable function profiling\n"));
3698 printf (_(" -o <file> Place output into <file> \n"));
3700 -G <number> Put global and static data smaller than <number>\n\
3701 bytes into a special section (on some targets)\n"));
3703 for (i = ARRAY_SIZE (debug_args); i--;)
3705 if (debug_args[i].description != NULL)
3706 printf (" -g%-21s %s\n",
3707 debug_args[i].arg, _(debug_args[i].description));
3710 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3711 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3712 printf (_(" -version Display the compiler's version\n"));
3713 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3714 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3715 #if defined INSN_SCHEDULING
3716 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3718 printf (_(" --help Display this information\n"));
3723 /* Display descriptions of language specific options.
3724 If there is no description, note that there is an undocumented option.
3725 If the description is empty, do not display anything. (This allows
3726 options to be deliberately undocumented, for whatever reason).
3727 If the option string is missing, then this is a marker, indicating
3728 that the description string is in fact the name of a language, whose
3729 language specific options are to follow. */
3731 if (ARRAY_SIZE (documented_lang_options) > 1)
3733 printf (_("\nLanguage specific options:\n"));
3735 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3737 const char *description = documented_lang_options[i].description;
3738 const char *option = documented_lang_options[i].option;
3740 if (description == NULL)
3745 printf (_(" %-23.23s [undocumented]\n"), option);
3747 else if (*description == 0)
3749 else if (option == NULL)
3753 (_("\nThere are undocumented %s specific options as well.\n"),
3757 printf (_("\n Options for %s:\n"), description);
3762 printf (" %-23.23s %s\n", option, _(description));
3767 printf (_("\nThere are undocumented %s specific options as well.\n"),
3770 display_target_options ();
3774 display_target_options ()
3777 static bool displayed = false;
3779 /* Avoid double printing for --help --target-help. */
3784 if (ARRAY_SIZE (target_switches) > 1
3785 #ifdef TARGET_OPTIONS
3786 || ARRAY_SIZE (target_options) > 1
3794 printf (_("\nTarget specific options:\n"));
3796 for (i = ARRAY_SIZE (target_switches); i--;)
3798 const char *option = target_switches[i].name;
3799 const char *description = target_switches[i].description;
3801 if (option == NULL || *option == 0)
3803 else if (description == NULL)
3808 printf (_(" -m%-23.23s [undocumented]\n"), option);
3810 else if (*description != 0)
3811 doc += printf (" -m%-23.23s %s\n", option, _(description));
3814 #ifdef TARGET_OPTIONS
3815 for (i = ARRAY_SIZE (target_options); i--;)
3817 const char *option = target_options[i].prefix;
3818 const char *description = target_options[i].description;
3820 if (option == NULL || *option == 0)
3822 else if (description == NULL)
3827 printf (_(" -m%-23.23s [undocumented]\n"), option);
3829 else if (*description != 0)
3830 doc += printf (" -m%-23.23s %s\n", option, _(description));
3836 printf (_("\nThere are undocumented target specific options as well.\n"));
3838 printf (_(" They exist, but they are not documented.\n"));
3843 /* Parse a -d... command line switch. */
3846 decode_d_option (arg)
3855 for (i = 0; i < (int) DFI_MAX; ++i)
3856 dump_file[i].enabled = 1;
3862 flag_print_asm_name = 1;
3865 flag_dump_rtl_in_asm = 1;
3866 flag_print_asm_name = 1;
3869 graph_dump_format = vcg;
3872 rtl_dump_and_exit = 1;
3877 case 'D': /* These are handled by the preprocessor. */
3883 for (i = 0; i < (int) DFI_MAX; ++i)
3884 if (c == dump_file[i].debug_switch)
3886 dump_file[i].enabled = 1;
3891 warning ("unrecognized gcc debugging option: %c", c);
3896 /* Parse a -f... command line switch. ARG is the value after the -f.
3897 It is safe to access 'ARG - 2' to generate the full switch name.
3898 Return the number of strings consumed. */
3901 decode_f_option (arg)
3905 const char *option_value = NULL;
3907 /* Search for the option in the table of binary f options. */
3908 for (j = ARRAY_SIZE (f_options); j--;)
3910 if (!strcmp (arg, f_options[j].string))
3912 *f_options[j].variable = f_options[j].on_value;
3916 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3917 && ! strcmp (arg + 3, f_options[j].string))
3919 *f_options[j].variable = ! f_options[j].on_value;
3924 if (!strcmp (arg, "fast-math"))
3925 set_fast_math_flags (1);
3926 else if (!strcmp (arg, "no-fast-math"))
3927 set_fast_math_flags (0);
3928 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3929 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3932 read_integral_parameter (option_value, arg - 2,
3934 set_param_value ("max-inline-insns", val);
3936 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
3938 if (strcmp (option_value, "global-dynamic") == 0)
3939 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
3940 else if (strcmp (option_value, "local-dynamic") == 0)
3941 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
3942 else if (strcmp (option_value, "initial-exec") == 0)
3943 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
3944 else if (strcmp (option_value, "local-exec") == 0)
3945 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
3947 warning ("`%s': unknown tls-model option", arg - 2);
3949 #ifdef INSN_SCHEDULING
3950 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3951 fix_sched_param ("verbose", option_value);
3953 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3954 fix_register (option_value, 1, 1);
3955 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3956 fix_register (option_value, 0, 1);
3957 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3958 fix_register (option_value, 0, 0);
3959 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3960 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3961 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3963 = read_integral_parameter (option_value, arg - 2, align_functions);
3964 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3965 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3966 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3968 = read_integral_parameter (option_value, arg - 2, align_labels);
3969 else if ((option_value
3970 = skip_leading_substring (arg, "stack-limit-register=")))
3972 int reg = decode_reg_name (option_value);
3974 error ("unrecognized register name `%s'", option_value);
3976 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3978 else if ((option_value
3979 = skip_leading_substring (arg, "stack-limit-symbol=")))
3982 nm = ggc_strdup (option_value);
3983 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3985 else if ((option_value
3986 = skip_leading_substring (arg, "message-length=")))
3987 output_set_maximum_length
3988 (&global_dc->buffer, read_integral_parameter
3989 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3990 else if ((option_value
3991 = skip_leading_substring (arg, "diagnostics-show-location=")))
3993 if (!strcmp (option_value, "once"))
3994 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3995 else if (!strcmp (option_value, "every-line"))
3996 diagnostic_prefixing_rule (global_dc)
3997 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3999 error ("unrecognized option `%s'", arg - 2);
4001 else if (!strcmp (arg, "no-stack-limit"))
4002 stack_limit_rtx = NULL_RTX;
4003 else if (!strcmp (arg, "preprocessed"))
4004 /* Recognise this switch but do nothing. This prevents warnings
4005 about an unrecognized switch if cpplib has not been linked in. */
4013 /* Parse a -W... command line switch. ARG is the value after the -W.
4014 It is safe to access 'ARG - 2' to generate the full switch name.
4015 Return the number of strings consumed. */
4018 decode_W_option (arg)
4021 const char *option_value = NULL;
4024 /* Search for the option in the table of binary W options. */
4026 for (j = ARRAY_SIZE (W_options); j--;)
4028 if (!strcmp (arg, W_options[j].string))
4030 *W_options[j].variable = W_options[j].on_value;
4034 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4035 && ! strcmp (arg + 3, W_options[j].string))
4037 *W_options[j].variable = ! W_options[j].on_value;
4042 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4043 warning ("-Wid-clash-LEN is no longer supported");
4044 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4046 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4048 warn_larger_than = larger_than_size != -1;
4050 else if (!strcmp (arg, "unused"))
4054 else if (!strcmp (arg, "no-unused"))
4064 /* Parse a -g... command line switch. ARG is the value after the -g.
4065 It is safe to access 'ARG - 2' to generate the full switch name.
4066 Return the number of strings consumed. */
4069 decode_g_option (arg)
4072 static unsigned level = 0;
4073 /* A lot of code assumes write_symbols == NO_DEBUG if the
4074 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4075 of what debugging type has been selected). This records the
4076 selected type. It is an error to specify more than one
4078 static enum debug_info_type selected_debug_type = NO_DEBUG;
4079 /* Non-zero if debugging format has been explicitly set.
4080 -g and -ggdb don't explicitly set the debugging format so
4081 -gdwarf -g3 is equivalent to -gdwarf3. */
4082 static int type_explicitly_set_p = 0;
4083 /* Indexed by enum debug_info_type. */
4084 static const char *const debug_type_names[] =
4086 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4089 /* The maximum admissible debug level value. */
4090 static const unsigned max_debug_level = 3;
4092 /* Look up ARG in the table. */
4093 for (da = debug_args; da->arg; da++)
4095 const int da_len = strlen (da->arg);
4097 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4099 enum debug_info_type type = da->debug_type;
4100 const char *p = arg + da_len;
4102 if (*p && ! ISDIGIT (*p))
4105 /* A debug flag without a level defaults to level 2.
4106 Note we do not want to call read_integral_parameter
4107 for that case since it will call atoi which
4110 ??? We may want to generalize the interface to
4111 read_integral_parameter to better handle this case
4112 if this case shows up often. */
4114 level = read_integral_parameter (p, 0, max_debug_level + 1);
4116 level = (level == 0) ? 2 : level;
4118 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4120 error ("use -gdwarf -g%d for DWARF v1, level %d",
4123 error ("use -gdwarf-2 for DWARF v2");
4126 if (level > max_debug_level)
4129 ignoring option `%s' due to invalid debug level specification",
4131 level = debug_info_level;
4134 if (type == NO_DEBUG)
4136 type = PREFERRED_DEBUGGING_TYPE;
4138 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4140 #ifdef DWARF2_DEBUGGING_INFO
4141 type = DWARF2_DEBUG;
4143 #ifdef DBX_DEBUGGING_INFO
4150 if (type == NO_DEBUG)
4151 warning ("`%s': unknown or unsupported -g option", arg - 2);
4153 /* Does it conflict with an already selected type? */
4154 if (type_explicitly_set_p
4155 /* -g/-ggdb don't conflict with anything. */
4156 && da->debug_type != NO_DEBUG
4157 && type != selected_debug_type)
4158 warning ("`%s' ignored, conflicts with `-g%s'",
4159 arg - 2, debug_type_names[(int) selected_debug_type]);
4162 /* If the format has already been set, -g/-ggdb
4163 only change the debug level. */
4164 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4165 /* Don't change debugging type. */
4169 selected_debug_type = type;
4170 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4173 write_symbols = (level == 0
4175 : selected_debug_type);
4176 use_gnu_debug_info_extensions = da->use_extensions_p;
4177 debug_info_level = (enum debug_info_level) level;
4190 /* Decode the first argument in the argv as a language-independent option.
4191 Return the number of strings consumed. */
4194 independent_decode_option (argc, argv)
4198 char *arg = argv[0];
4200 if (arg[0] != '-' || arg[1] == 0)
4212 if (!strcmp (arg, "-help"))
4215 exit_after_options = 1;
4218 if (!strcmp (arg, "-target-help"))
4220 display_target_options ();
4221 exit_after_options = 1;
4224 if (!strcmp (arg, "-version"))
4226 print_version (stderr, "");
4227 exit_after_options = 1;
4230 /* Handle '--param <name>=<value>'. */
4231 if (strcmp (arg, "-param") == 0)
4237 error ("-param option missing argument");
4241 /* Get the '<name>=<value>' parameter. */
4243 /* Look for the `='. */
4244 equal = strchr (arg, '=');
4246 error ("invalid --param option: %s", arg);
4251 /* Zero out the `=' sign so that we get two separate strings. */
4253 /* Figure out what value is specified. */
4254 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4255 if (val != INVALID_PARAM_VAL)
4256 set_param_value (arg, val);
4258 error ("invalid parameter value `%s'", equal + 1);
4273 /* Already been treated in main (). Do nothing. */
4277 set_target_switch (arg + 1);
4281 return decode_f_option (arg + 1);
4284 return decode_g_option (arg + 1);
4287 if (!strcmp (arg, "dumpbase"))
4292 dump_base_name = argv[1];
4296 decode_d_option (arg + 1);
4300 if (!strcmp (arg, "pedantic"))
4302 else if (!strcmp (arg, "pedantic-errors"))
4303 flag_pedantic_errors = pedantic = 1;
4304 else if (arg[1] == 0)
4311 if (!strcmp (arg, "quiet"))
4318 if (!strcmp (arg, "version"))
4326 inhibit_warnings = 1;
4335 /* We save the value of warn_uninitialized, since if they put
4336 -Wuninitialized on the command line, we need to generate a
4337 warning about not using it without also specifying -O. */
4338 if (warn_uninitialized != 1)
4339 warn_uninitialized = 2;
4342 return decode_W_option (arg + 1);
4346 if (!strncmp (arg, "aux-info", 8))
4353 aux_info_file_name = argv[1];
4354 flag_gen_aux_info = 1;
4357 else if (arg[8] == '=')
4359 aux_info_file_name = arg + 9;
4360 flag_gen_aux_info = 1;
4375 asm_file_name = argv[1];
4390 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4395 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4399 if (g_switch_val == -1)
4403 g_switch_set = TRUE;
4404 g_switch_value = g_switch_val;
4414 /* Decode -m switches. */
4415 /* Decode the switch -mNAME. */
4418 set_target_switch (name)
4422 int valid_target_option = 0;
4424 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4425 if (!strcmp (target_switches[j].name, name))
4427 if (target_switches[j].value < 0)
4428 target_flags &= ~-target_switches[j].value;
4430 target_flags |= target_switches[j].value;
4433 if (target_switches[j].value < 0)
4434 target_flags_explicit |= -target_switches[j].value;
4436 target_flags_explicit |= target_switches[j].value;
4438 valid_target_option = 1;
4441 #ifdef TARGET_OPTIONS
4442 if (!valid_target_option)
4443 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4445 int len = strlen (target_options[j].prefix);
4446 if (!strncmp (target_options[j].prefix, name, len))
4448 *target_options[j].variable = name + len;
4449 valid_target_option = 1;
4454 if (!valid_target_option)
4455 error ("invalid option `%s'", name);
4458 /* Print version information to FILE.
4459 Each line begins with INDENT (for the case where FILE is the
4460 assembler output file). */
4463 print_version (file, indent)
4468 #define __VERSION__ "[?]"
4472 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4474 "%s%s%s version %s (%s) compiled by CC.\n"
4476 , indent, *indent != 0 ? " " : "",
4477 lang_hooks.name, version_string, TARGET_NAME,
4478 indent, __VERSION__);
4481 /* Print an option value and return the adjusted position in the line.
4482 ??? We don't handle error returns from fprintf (disk full); presumably
4483 other code will catch a disk full though. */
4486 print_single_switch (file, pos, max, indent, sep, term, type, name)
4489 const char *indent, *sep, *term, *type, *name;
4491 /* The ultrix fprintf returns 0 on success, so compute the result we want
4492 here since we need it for the following test. */
4493 int len = strlen (sep) + strlen (type) + strlen (name);
4498 fprintf (file, "%s", term);
4503 fprintf (file, "%s", indent);
4504 pos = strlen (indent);
4506 fprintf (file, "%s%s%s", sep, type, name);
4511 /* Print active target switches to FILE.
4512 POS is the current cursor position and MAX is the size of a "line".
4513 Each line begins with INDENT and ends with TERM.
4514 Each switch is separated from the next by SEP. */
4517 print_switch_values (file, pos, max, indent, sep, term)
4520 const char *indent, *sep, *term;
4525 /* Print the options as passed. */
4527 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4528 _("options passed: "), "");
4530 for (p = &save_argv[1]; *p != NULL; p++)
4534 if (strcmp (*p, "-o") == 0)
4540 if (strcmp (*p, "-quiet") == 0)
4542 if (strcmp (*p, "-version") == 0)
4547 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4550 fprintf (file, "%s", term);
4552 /* Print the -f and -m options that have been enabled.
4553 We don't handle language specific options but printing argv
4556 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4557 _("options enabled: "), "");
4559 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4560 if (*f_options[j].variable == f_options[j].on_value)
4561 pos = print_single_switch (file, pos, max, indent, sep, term,
4562 "-f", f_options[j].string);
4564 /* Print target specific options. */
4566 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4567 if (target_switches[j].name[0] != '\0'
4568 && target_switches[j].value > 0
4569 && ((target_switches[j].value & target_flags)
4570 == target_switches[j].value))
4572 pos = print_single_switch (file, pos, max, indent, sep, term,
4573 "-m", target_switches[j].name);
4576 #ifdef TARGET_OPTIONS
4577 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4578 if (*target_options[j].variable != NULL)
4581 sprintf (prefix, "-m%s", target_options[j].prefix);
4582 pos = print_single_switch (file, pos, max, indent, sep, term,
4583 prefix, *target_options[j].variable);
4587 fprintf (file, "%s", term);
4590 /* Open assembly code output file. Do this even if -fsyntax-only is
4591 on, because then the driver will have provided the name of a
4592 temporary file or bit bucket for us. NAME is the file specified on
4593 the command line, possibly NULL. */
4595 init_asm_output (name)
4598 if (name == NULL && asm_file_name == 0)
4599 asm_out_file = stdout;
4602 if (asm_file_name == 0)
4604 int len = strlen (dump_base_name);
4605 char *dumpname = (char *) xmalloc (len + 6);
4606 memcpy (dumpname, dump_base_name, len + 1);
4607 strip_off_ending (dumpname, len);
4608 strcat (dumpname, ".s");
4609 asm_file_name = dumpname;
4611 if (!strcmp (asm_file_name, "-"))
4612 asm_out_file = stdout;
4614 asm_out_file = fopen (asm_file_name, "w");
4615 if (asm_out_file == 0)
4616 fatal_io_error ("can't open %s for writing", asm_file_name);
4619 #ifdef IO_BUFFER_SIZE
4620 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4621 _IOFBF, IO_BUFFER_SIZE);
4624 if (!flag_syntax_only)
4626 #ifdef ASM_FILE_START
4627 ASM_FILE_START (asm_out_file);
4630 #ifdef ASM_COMMENT_START
4631 if (flag_verbose_asm)
4633 /* Print the list of options in effect. */
4634 print_version (asm_out_file, ASM_COMMENT_START);
4635 print_switch_values (asm_out_file, 0, MAX_LINE,
4636 ASM_COMMENT_START, " ", "\n");
4637 /* Add a blank line here so it appears in assembler output but not
4639 fprintf (asm_out_file, "\n");
4645 /* Initialization of the front end environment, before command line
4646 options are parsed. Signal handlers, internationalization etc.
4647 ARGV0 is main's argv[0]. */
4649 general_init (argv0)
4654 p = argv0 + strlen (argv0);
4655 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4659 xmalloc_set_program_name (progname);
4663 gcc_init_libintl ();
4665 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4667 signal (SIGSEGV, crash_signal);
4670 signal (SIGILL, crash_signal);
4673 signal (SIGBUS, crash_signal);
4676 signal (SIGABRT, crash_signal);
4678 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4679 signal (SIGIOT, crash_signal);
4682 signal (SIGFPE, crash_signal);
4685 /* Initialize the diagnostics reporting machinery, so option parsing
4686 can give warnings and errors. */
4687 diagnostic_initialize (global_dc);
4690 /* Parse command line options and set default flag values, called
4691 after language-independent option-independent initialization. Do
4692 minimal options processing. Outputting diagnostics is OK, but GC
4693 and identifier hashtables etc. are not initialized yet.
4695 Return non-zero to suppress compiler back end initialization. */
4697 parse_options_and_default_flags (argc, argv)
4703 /* Save in case md file wants to emit args as a comment. */
4707 /* Initialize register usage now so switches may override. */
4710 /* Register the language-independent parameters. */
4711 add_params (lang_independent_params, LAST_PARAM);
4713 /* Perform language-specific options initialization. */
4714 (*lang_hooks.init_options) ();
4716 /* Scan to see what optimization level has been specified. That will
4717 determine the default value of many flags. */
4718 for (i = 1; i < argc; i++)
4720 if (!strcmp (argv[i], "-O"))
4725 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4727 /* Handle -Os, -O2, -O3, -O69, ... */
4728 char *p = &argv[i][2];
4730 if ((p[0] == 's') && (p[1] == 0))
4734 /* Optimizing for size forces optimize to be 2. */
4739 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4740 if (optimize_val != -1)
4742 optimize = optimize_val;
4751 flag_merge_constants = 0;
4757 flag_thread_jumps = 1;
4759 flag_delayed_branch = 1;
4761 #ifdef CAN_DEBUG_WITHOUT_FP
4762 flag_omit_frame_pointer = 1;
4764 flag_guess_branch_prob = 1;
4765 flag_cprop_registers = 1;
4766 flag_loop_optimize = 1;
4767 flag_crossjumping = 1;
4768 flag_if_conversion = 1;
4769 flag_if_conversion2 = 1;
4774 flag_optimize_sibling_calls = 1;
4775 flag_cse_follow_jumps = 1;
4776 flag_cse_skip_blocks = 1;
4778 flag_expensive_optimizations = 1;
4779 flag_strength_reduce = 1;
4780 flag_rerun_cse_after_loop = 1;
4781 flag_rerun_loop_opt = 1;
4782 flag_caller_saves = 1;
4785 #ifdef INSN_SCHEDULING
4786 flag_schedule_insns = 1;
4787 flag_schedule_insns_after_reload = 1;
4790 flag_strict_aliasing = 1;
4791 flag_delete_null_pointer_checks = 1;
4792 flag_reorder_blocks = 1;
4793 flag_reorder_functions = 1;
4798 flag_inline_functions = 1;
4799 flag_rename_registers = 1;
4802 if (optimize < 2 || optimize_size)
4807 align_functions = 1;
4810 /* Initialize whether `char' is signed. */
4811 flag_signed_char = DEFAULT_SIGNED_CHAR;
4812 #ifdef DEFAULT_SHORT_ENUMS
4813 /* Initialize how much space enums occupy, by default. */
4814 flag_short_enums = DEFAULT_SHORT_ENUMS;
4817 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4820 set_target_switch ("");
4822 /* Unwind tables are always present in an ABI-conformant IA-64
4823 object file, so the default should be ON. */
4824 #ifdef IA64_UNWIND_INFO
4825 flag_unwind_tables = IA64_UNWIND_INFO;
4828 #ifdef OPTIMIZATION_OPTIONS
4829 /* Allow default optimizations to be specified on a per-machine basis. */
4830 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4833 /* Perform normal command line switch decoding. */
4834 for (i = 1; i < argc;)
4837 int indep_processed;
4839 /* Give the language a chance to decode the option for itself. */
4840 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4842 if (lang_processed >= 0)
4843 /* Now see if the option also has a language independent meaning.
4844 Some options are both language specific and language independent,
4846 indep_processed = independent_decode_option (argc - i, argv + i);
4849 lang_processed = -lang_processed;
4850 indep_processed = 0;
4853 if (lang_processed || indep_processed)
4854 i += MAX (lang_processed, indep_processed);
4857 const char *option = NULL;
4858 const char *lang = NULL;
4861 /* It is possible that the command line switch is not valid for the
4862 current language, but it is valid for another language. In order
4863 to be compatible with previous versions of the compiler (which
4864 did not issue an error message in this case) we check for this
4865 possibility here. If we do find a match, then if extra_warnings
4866 is set we generate a warning message, otherwise we will just
4867 ignore the option. */
4868 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4870 option = documented_lang_options[j].option;
4873 lang = documented_lang_options[j].description;
4874 else if (! strncmp (argv[i], option, strlen (option)))
4878 if (j != ARRAY_SIZE (documented_lang_options))
4882 warning ("ignoring command line option '%s'", argv[i]);
4885 ("(it is valid for %s but not the selected language)",
4889 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4890 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4892 error ("unrecognized option `%s'", argv[i]);
4898 if (flag_no_inline == 2)
4901 flag_really_no_inline = flag_no_inline;
4903 /* Set flag_no_inline before the post_options () hook. The C front
4904 ends use it to determine tree inlining defaults. FIXME: such
4905 code should be lang-independent when all front ends use tree
4906 inlining, in which case it, and this condition, should be moved
4907 to the top of process_options() instead. */
4910 /* Inlining does not work if not optimizing,
4911 so force it not to be done. */
4915 /* The c_decode_option function and decode_option hook set
4916 this to `2' if -Wall is used, so we can avoid giving out
4917 lots of errors for people who don't realize what -Wall does. */
4918 if (warn_uninitialized == 1)
4919 warning ("-Wuninitialized is not supported without -O");
4922 if (flag_really_no_inline == 2)
4923 flag_really_no_inline = flag_no_inline;
4925 /* All command line options have been parsed; allow the front end to
4926 perform consistency checks, etc. */
4927 return (*lang_hooks.post_options) ();
4930 /* Process the options that have been parsed. */
4934 #ifdef OVERRIDE_OPTIONS
4935 /* Some machines may reject certain combinations of options. */
4939 /* Set up the align_*_log variables, defaulting them to 1 if they
4940 were still unset. */
4941 if (align_loops <= 0) align_loops = 1;
4942 if (align_loops_max_skip > align_loops || !align_loops)
4943 align_loops_max_skip = align_loops - 1;
4944 align_loops_log = floor_log2 (align_loops * 2 - 1);
4945 if (align_jumps <= 0) align_jumps = 1;
4946 if (align_jumps_max_skip > align_jumps || !align_jumps)
4947 align_jumps_max_skip = align_jumps - 1;
4948 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4949 if (align_labels <= 0) align_labels = 1;
4950 align_labels_log = floor_log2 (align_labels * 2 - 1);
4951 if (align_labels_max_skip > align_labels || !align_labels)
4952 align_labels_max_skip = align_labels - 1;
4953 if (align_functions <= 0) align_functions = 1;
4954 align_functions_log = floor_log2 (align_functions * 2 - 1);
4956 /* Unrolling all loops implies that standard loop unrolling must also
4958 if (flag_unroll_all_loops)
4959 flag_unroll_loops = 1;
4960 /* Loop unrolling requires that strength_reduction be on also. Silently
4961 turn on strength reduction here if it isn't already on. Also, the loop
4962 unrolling code assumes that cse will be run after loop, so that must
4963 be turned on also. */
4964 if (flag_unroll_loops)
4966 flag_strength_reduce = 1;
4967 flag_rerun_cse_after_loop = 1;
4970 if (flag_non_call_exceptions)
4971 flag_asynchronous_unwind_tables = 1;
4972 if (flag_asynchronous_unwind_tables)
4973 flag_unwind_tables = 1;
4975 /* Warn about options that are not supported on this machine. */
4976 #ifndef INSN_SCHEDULING
4977 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4978 warning ("instruction scheduling not supported on this target machine");
4981 if (flag_delayed_branch)
4982 warning ("this target machine does not have delayed branches");
4985 user_label_prefix = USER_LABEL_PREFIX;
4986 if (flag_leading_underscore != -1)
4988 /* If the default prefix is more complicated than "" or "_",
4989 issue a warning and ignore this option. */
4990 if (user_label_prefix[0] == 0 ||
4991 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4993 user_label_prefix = flag_leading_underscore ? "_" : "";
4996 warning ("-f%sleading-underscore not supported on this target machine",
4997 flag_leading_underscore ? "" : "no-");
5000 /* If we are in verbose mode, write out the version and maybe all the
5001 option flags in use. */
5004 print_version (stderr, "");
5006 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5012 if (flag_syntax_only)
5014 write_symbols = NO_DEBUG;
5018 /* Now we know write_symbols, set up the debug hooks based on it.
5019 By default we do nothing for debug output. */
5020 #if defined(DBX_DEBUGGING_INFO)
5021 if (write_symbols == DBX_DEBUG)
5022 debug_hooks = &dbx_debug_hooks;
5024 #if defined(XCOFF_DEBUGGING_INFO)
5025 if (write_symbols == XCOFF_DEBUG)
5026 debug_hooks = &xcoff_debug_hooks;
5028 #ifdef SDB_DEBUGGING_INFO
5029 if (write_symbols == SDB_DEBUG)
5030 debug_hooks = &sdb_debug_hooks;
5032 #ifdef DWARF_DEBUGGING_INFO
5033 if (write_symbols == DWARF_DEBUG)
5034 debug_hooks = &dwarf_debug_hooks;
5036 #ifdef DWARF2_DEBUGGING_INFO
5037 if (write_symbols == DWARF2_DEBUG)
5038 debug_hooks = &dwarf2_debug_hooks;
5040 #ifdef VMS_DEBUGGING_INFO
5041 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5042 debug_hooks = &vmsdbg_debug_hooks;
5045 /* If auxiliary info generation is desired, open the output file.
5046 This goes in the same directory as the source file--unlike
5047 all the other output files. */
5048 if (flag_gen_aux_info)
5050 aux_info_file = fopen (aux_info_file_name, "w");
5051 if (aux_info_file == 0)
5052 fatal_io_error ("can't open %s", aux_info_file_name);
5055 if (! targetm.have_named_sections)
5057 if (flag_function_sections)
5059 warning ("-ffunction-sections not supported for this target");
5060 flag_function_sections = 0;
5062 if (flag_data_sections)
5064 warning ("-fdata-sections not supported for this target");
5065 flag_data_sections = 0;
5069 if (flag_function_sections && profile_flag)
5071 warning ("-ffunction-sections disabled; it makes profiling impossible");
5072 flag_function_sections = 0;
5075 #ifndef HAVE_prefetch
5076 if (flag_prefetch_loop_arrays)
5078 warning ("-fprefetch-loop-arrays not supported for this target");
5079 flag_prefetch_loop_arrays = 0;
5082 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5084 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5085 flag_prefetch_loop_arrays = 0;
5089 /* This combination of options isn't handled for i386 targets and doesn't
5090 make much sense anyway, so don't allow it. */
5091 if (flag_prefetch_loop_arrays && optimize_size)
5093 warning ("-fprefetch-loop-arrays is not supported with -Os");
5094 flag_prefetch_loop_arrays = 0;
5097 #ifndef OBJECT_FORMAT_ELF
5098 if (flag_function_sections && write_symbols != NO_DEBUG)
5099 warning ("-ffunction-sections may affect debugging on some targets");
5102 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5103 if (flag_signaling_nans)
5104 flag_trapping_math = 1;
5107 /* Language-independent initialization, before language-dependent
5110 lang_independent_init (no_backend)
5113 /* Initialize the garbage-collector, and string pools. */
5122 /* init_emit_once uses reg_raw_mode and therefore must be called
5123 after init_regs which initialized reg_raw_mode. */
5125 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5126 || debug_info_level == DINFO_LEVEL_VERBOSE
5127 #ifdef VMS_DEBUGGING_INFO
5128 /* Enable line number info for traceback */
5129 || debug_info_level > DINFO_LEVEL_NONE
5131 || flag_test_coverage
5132 || warn_notreached);
5133 init_fake_stack_mems ();
5137 init_function_once ();
5138 init_varasm_once ();
5140 /* The following initialization functions need to generate rtl, so
5141 provide a dummy function context for them. */
5142 init_dummy_function_start ();
5144 if (flag_caller_saves)
5145 init_caller_save ();
5146 expand_dummy_function_end ();
5149 /* Language-dependent initialization. Returns non-zero on success. */
5151 lang_dependent_init (name)
5154 if (dump_base_name == 0)
5155 dump_base_name = name ? name : "gccdump";
5157 /* Front-end initialization. This hook can assume that GC,
5158 identifier hashes etc. are set up, but debug initialization is
5159 not done yet. This routine must return the original filename
5160 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5161 name = (*lang_hooks.init) (name);
5165 /* Is this duplication necessary? */
5166 name = ggc_strdup (name);
5167 main_input_filename = input_filename = name;
5168 init_asm_output (name);
5170 /* These create various _DECL nodes, so need to be called after the
5171 front end is initialized. */
5175 /* The following initialization functions need to generate rtl, so
5176 provide a dummy function context for them. */
5177 init_dummy_function_start ();
5179 expand_dummy_function_end ();
5181 /* Put an entry on the input file stack for the main input file. */
5182 push_srcloc (input_filename, 0);
5184 /* If dbx symbol table desired, initialize writing it and output the
5185 predefined types. */
5186 timevar_push (TV_SYMOUT);
5188 #ifdef DWARF2_UNWIND_INFO
5189 if (dwarf2out_do_frame ())
5190 dwarf2out_frame_init ();
5193 /* Now we have the correct original filename, we can initialize
5195 (*debug_hooks->init) (name);
5197 timevar_pop (TV_SYMOUT);
5202 /* Clean up: close opened files, etc. */
5207 /* Close the dump files. */
5208 if (flag_gen_aux_info)
5210 fclose (aux_info_file);
5212 unlink (aux_info_file_name);
5215 /* Close non-debugging input and output files. Take special care to note
5216 whether fclose returns an error, since the pages might still be on the
5217 buffer chain while the file is open. */
5221 if (ferror (asm_out_file) != 0)
5222 fatal_io_error ("error writing to %s", asm_file_name);
5223 if (fclose (asm_out_file) != 0)
5224 fatal_io_error ("error closing %s", asm_file_name);
5227 /* Do whatever is necessary to finish printing the graphs. */
5228 if (graph_dump_format != no_graph)
5232 for (i = 0; i < (int) DFI_MAX; ++i)
5233 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5238 sprintf (seq, DUMPFILE_FORMAT, i);
5239 suffix = concat (seq, dump_file[i].extension, NULL);
5240 finish_graph_dump_file (dump_base_name, suffix);
5247 ggc_print_statistics ();
5248 stringpool_statistics ();
5249 dump_tree_statistics ();
5252 /* Free up memory for the benefit of leak detectors. */
5255 /* Language-specific end of compilation actions. */
5256 (*lang_hooks.finish) ();
5259 /* Initialize the compiler, and compile the input file. */
5261 do_compile (no_backend)
5264 /* The bulk of command line switch processing. */
5267 /* We cannot start timing until after options are processed since that
5268 says if we run timers or not. */
5270 timevar_start (TV_TOTAL);
5272 /* Language-independent initialization. Also sets up GC, identifier
5273 hashes etc., and the back-end if requested. */
5274 lang_independent_init (no_backend);
5276 /* Language-dependent initialization. Returns true on success. */
5277 if (lang_dependent_init (filename))
5282 /* Stop timing and print the times. */
5283 timevar_stop (TV_TOTAL);
5284 timevar_print (stderr);
5287 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5288 Decode command args, then call compile_file.
5289 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5290 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5292 It is not safe to call this function more than once. */
5295 toplev_main (argc, argv)
5301 /* Initialization of GCC's environment, and diagnostics. */
5302 general_init (argv[0]);
5304 /* Parse the options and do minimal processing; basically just
5305 enough to default flags appropriately. */
5306 no_backend = parse_options_and_default_flags (argc, argv);
5308 /* Exit early if we can (e.g. -help). */
5309 if (!errorcount && !exit_after_options)
5310 do_compile (no_backend);
5312 if (errorcount || sorrycount)
5313 return (FATAL_EXIT_CODE);
5315 return (SUCCESS_EXIT_CODE);