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. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.h"
49 #include "insn-flags.h"
50 #include "hard-reg-set.h"
57 #include "basic-block.h"
64 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
72 #include "langhooks.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. */
96 /* The extra parameters substantially improve the I/O performance. */
99 vms_fopen (fname, type)
103 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
104 fixed arguments, which matches ANSI's specification but not VAXCRTL's
105 pre-ANSI implementation. This hack circumvents the mismatch problem. */
106 FILE *(*vmslib_fopen)() = (FILE *(*)()) fopen;
109 return (*vmslib_fopen) (fname, type, "mbc=32",
110 "deq=64", "fop=tef", "shr=nil");
112 return (*vmslib_fopen) (fname, type, "mbc=32");
115 #define fopen vms_fopen
118 /* Carry information from ASM_DECLARE_OBJECT_NAME
119 to ASM_FINISH_DECLARE_OBJECT. */
121 extern int size_directive_output;
122 extern tree last_assemble_variable_decl;
124 static void general_init PARAMS ((char *));
125 static void parse_options_and_default_flags PARAMS ((int, char **));
126 static void do_compile PARAMS ((void));
127 static void process_options PARAMS ((void));
128 static void lang_independent_init PARAMS ((void));
129 static int lang_dependent_init PARAMS ((const char *));
130 static void init_asm_output PARAMS ((const char *));
131 static void finalize PARAMS ((void));
133 static void set_target_switch PARAMS ((const char *));
134 static const char *decl_name PARAMS ((tree, int));
136 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
137 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
138 static void set_float_handler PARAMS ((jmp_buf));
139 static void compile_file PARAMS ((void));
140 static void display_help PARAMS ((void));
141 static void display_target_options PARAMS ((void));
143 static void decode_d_option PARAMS ((const char *));
144 static int decode_f_option PARAMS ((const char *));
145 static int decode_W_option PARAMS ((const char *));
146 static int decode_g_option PARAMS ((const char *));
147 static unsigned int independent_decode_option PARAMS ((int, char **));
149 static void print_version PARAMS ((FILE *, const char *));
150 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
151 const char *, const char *,
152 const char *, const char *));
153 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
154 const char *, const char *));
156 /* Length of line when printing switch values. */
159 /* Name of program invoked, sans directories. */
161 const char *progname;
163 /* Copy of arguments to toplev_main. */
167 /* Name of current original source file (what was input to cpp).
168 This comes from each #-command in the actual input. */
170 const char *input_filename;
172 /* Name of top-level original source file (what was input to cpp).
173 This comes from the #-command at the beginning of the actual input.
174 If there isn't any there, then this is the cc1 input file name. */
176 const char *main_input_filename;
178 /* Current line number in real source file. */
182 /* Nonzero if it is unsafe to create any new pseudo registers. */
185 /* Stack of currently pending input files. */
187 struct file_stack *input_file_stack;
189 /* Incremented on each change to input_file_stack. */
190 int input_file_stack_tick;
192 /* Name to use as base of names for dump output files. */
194 const char *dump_base_name;
196 /* Format to use to print dumpfile index value */
197 #ifndef DUMPFILE_FORMAT
198 #define DUMPFILE_FORMAT ".%02d."
201 /* Bit flags that specify the machine subtype we are compiling for.
202 Bits are tested using macros TARGET_... defined in the tm.h file
203 and set by `-m...' switches. Must be defined in rtlanal.c. */
205 extern int target_flags;
207 /* Debug hooks - dependent upon command line options. */
209 struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
211 /* Describes a dump file. */
213 struct dump_file_info
215 /* The unique extension to apply, e.g. ".jump". */
216 const char *const extension;
218 /* The -d<c> character that enables this dump file. */
219 char const debug_switch;
221 /* True if there is a corresponding graph dump file. */
222 char const graph_dump_p;
224 /* True if the user selected this dump. */
227 /* True if the files have been initialized (ie truncated). */
231 /* Enumerate the extant dump files. */
271 /* Describes all the dump files. Should be kept in order of the
272 pass and in sync with dump_file_index above.
274 Remaining -d letters:
280 static struct dump_file_info dump_file[DFI_MAX] =
282 { "rtl", 'r', 0, 0, 0 },
283 { "sibling", 'i', 0, 0, 0 },
284 { "eh", 'h', 0, 0, 0 },
285 { "jump", 'j', 0, 0, 0 },
286 { "ssa", 'e', 1, 0, 0 },
287 { "ssaccp", 'W', 1, 0, 0 },
288 { "ssadce", 'X', 1, 0, 0 },
289 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
290 { "null", 'u', 0, 0, 0 },
291 { "cse", 's', 0, 0, 0 },
292 { "addressof", 'F', 0, 0, 0 },
293 { "gcse", 'G', 1, 0, 0 },
294 { "loop", 'L', 1, 0, 0 },
295 { "cfg", 'f', 1, 0, 0 },
296 { "bp", 'b', 1, 0, 0 },
297 { "cse2", 't', 1, 0, 0 },
298 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
299 { "combine", 'c', 1, 0, 0 },
300 { "ce", 'C', 1, 0, 0 },
301 { "regmove", 'N', 1, 0, 0 },
302 { "sched", 'S', 1, 0, 0 },
303 { "lreg", 'l', 1, 0, 0 },
304 { "greg", 'g', 1, 0, 0 },
305 { "postreload", 'o', 1, 0, 0 },
306 { "flow2", 'w', 1, 0, 0 },
307 { "peephole2", 'z', 1, 0, 0 },
308 { "rnreg", 'n', 1, 0, 0 },
309 { "ce2", 'E', 1, 0, 0 },
310 { "sched2", 'R', 1, 0, 0 },
311 { "stack", 'k', 1, 0, 0 },
312 { "bbro", 'B', 1, 0, 0 },
313 { "mach", 'M', 1, 0, 0 },
314 { "dbr", 'd', 0, 0, 0 },
317 static int open_dump_file PARAMS ((enum dump_file_index, tree));
318 static void close_dump_file PARAMS ((enum dump_file_index,
319 void (*) (FILE *, rtx), rtx));
321 /* Other flags saying which kinds of debugging dump have been requested. */
323 int rtl_dump_and_exit;
324 int flag_print_asm_name;
325 static int version_flag;
326 static char *filename;
327 enum graph_dump_types graph_dump_format;
329 /* Name for output file of assembly code, specified with -o. */
333 /* Value of the -G xx switch, and whether it was passed or not. */
337 /* Type(s) of debugging information we are producing (if any).
338 See flags.h for the definitions of the different possible
339 types of debugging information. */
340 enum debug_info_type write_symbols = NO_DEBUG;
342 /* Level of debugging information we are producing. See flags.h
343 for the definitions of the different possible levels. */
344 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
346 /* Nonzero means use GNU-only extensions in the generated symbolic
347 debugging information. */
348 /* Currently, this only has an effect when write_symbols is set to
349 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
350 int use_gnu_debug_info_extensions = 0;
352 /* Nonzero means do optimizations. -O.
353 Particular numeric values stand for particular amounts of optimization;
354 thus, -O2 stores 2 here. However, the optimizations beyond the basic
355 ones are not controlled directly by this variable. Instead, they are
356 controlled by individual `flag_...' variables that are defaulted
357 based on this variable. */
361 /* Nonzero means optimize for size. -Os.
362 The only valid values are zero and non-zero. When optimize_size is
363 non-zero, optimize defaults to 2, but certain individual code
364 bloating optimizations are disabled. */
366 int optimize_size = 0;
368 /* Nonzero if we should exit after parsing options. */
369 static int exit_after_options = 0;
371 /* The FUNCTION_DECL for the function currently being compiled,
372 or 0 if between functions. */
373 tree current_function_decl;
375 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
377 tree current_function_func_begin_label;
379 /* Pointer to function to compute the name to use to print a declaration.
380 DECL is the declaration in question.
381 VERBOSITY determines what information will be printed:
382 0: DECL_NAME, demangled as necessary.
383 1: and scope information.
384 2: and any other information that might be interesting, such as function
385 parameter types in C++. */
387 const char *(*decl_printable_name) PARAMS ((tree, int));
389 /* Pointer to function to compute rtl for a language-specific tree code. */
391 typedef rtx (*lang_expand_expr_t)
392 PARAMS ((union tree_node *, rtx, enum machine_mode,
393 enum expand_modifier modifier));
395 lang_expand_expr_t lang_expand_expr = 0;
397 /* Pointer to function to finish handling an incomplete decl at the
398 end of compilation. */
400 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
402 /* Nonzero if doing dwarf2 duplicate elimination. */
404 int flag_eliminate_dwarf2_dups = 0;
406 /* Nonzero if generating code to do profiling. */
408 int profile_flag = 0;
410 /* Nonzero if generating code to profile program flow graph arcs. */
412 int profile_arc_flag = 0;
414 /* Nonzero if generating info for gcov to calculate line test coverage. */
416 int flag_test_coverage = 0;
418 /* Nonzero indicates that branch taken probabilities should be calculated. */
420 int flag_branch_probabilities = 0;
422 /* Nonzero if basic blocks should be reordered. */
424 int flag_reorder_blocks = 0;
426 /* Nonzero if registers should be renamed. */
428 int flag_rename_registers = 0;
429 int flag_cprop_registers = 0;
431 /* Nonzero for -pedantic switch: warn about anything
432 that standard spec forbids. */
436 /* Temporarily suppress certain warnings.
437 This is set while reading code from a system header file. */
439 int in_system_header = 0;
441 /* Don't print functions as they are compiled. -quiet. */
445 /* Print times taken by the various passes. -ftime-report. */
449 /* Print memory still in use at end of compilation (which may have little
450 to do with peak memory consumption). -fmem-report. */
454 /* Non-zero means to collect statistics which might be expensive
455 and to print them when we are done. */
456 int flag_detailed_statistics = 0;
461 /* Nonzero means `char' should be signed. */
463 int flag_signed_char;
465 /* Nonzero means give an enum type only as many bytes as it needs. */
467 int flag_short_enums;
469 /* Nonzero for -fcaller-saves: allocate values in regs that need to
470 be saved across function calls, if that produces overall better code.
471 Optional now, so people can test it. */
473 #ifdef DEFAULT_CALLER_SAVES
474 int flag_caller_saves = 1;
476 int flag_caller_saves = 0;
479 /* Nonzero if structures and unions should be returned in memory.
481 This should only be defined if compatibility with another compiler or
482 with an ABI is needed, because it results in slower code. */
484 #ifndef DEFAULT_PCC_STRUCT_RETURN
485 #define DEFAULT_PCC_STRUCT_RETURN 1
488 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
490 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
492 /* Nonzero for -fforce-mem: load memory value into a register
493 before arithmetic on it. This makes better cse but slower compilation. */
495 int flag_force_mem = 0;
497 /* Nonzero for -fforce-addr: load memory address into a register before
498 reference to memory. This makes better cse but slower compilation. */
500 int flag_force_addr = 0;
502 /* Nonzero for -fdefer-pop: don't pop args after each function call;
503 instead save them up to pop many calls' args with one insns. */
505 int flag_defer_pop = 0;
507 /* Nonzero for -ffloat-store: don't allocate floats and doubles
508 in extended-precision registers. */
510 int flag_float_store = 0;
512 /* Nonzero for -fcse-follow-jumps:
513 have cse follow jumps to do a more extensive job. */
515 int flag_cse_follow_jumps;
517 /* Nonzero for -fcse-skip-blocks:
518 have cse follow a branch around a block. */
519 int flag_cse_skip_blocks;
521 /* Nonzero for -fexpensive-optimizations:
522 perform miscellaneous relatively-expensive optimizations. */
523 int flag_expensive_optimizations;
525 /* Nonzero for -fthread-jumps:
526 have jump optimize output of loop. */
528 int flag_thread_jumps;
530 /* Nonzero enables strength-reduction in loop.c. */
532 int flag_strength_reduce = 0;
534 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
535 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
536 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
539 int flag_unroll_loops;
541 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
542 This is generally not a win. */
544 int flag_unroll_all_loops;
546 /* Nonzero enables prefetch optimizations for arrays in loops. */
548 int flag_prefetch_loop_arrays;
550 /* Nonzero forces all invariant computations in loops to be moved
553 int flag_move_all_movables = 0;
555 /* Nonzero forces all general induction variables in loops to be
558 int flag_reduce_all_givs = 0;
560 /* Nonzero to perform full register move optimization passes. This is the
563 int flag_regmove = 0;
565 /* Nonzero for -fwritable-strings:
566 store string constants in data segment and don't uniquize them. */
568 int flag_writable_strings = 0;
570 /* Nonzero means don't put addresses of constant functions in registers.
571 Used for compiling the Unix kernel, where strange substitutions are
572 done on the assembly output. */
574 int flag_no_function_cse = 0;
576 /* Nonzero for -fomit-frame-pointer:
577 don't make a frame pointer in simple functions that don't require one. */
579 int flag_omit_frame_pointer = 0;
581 /* Nonzero means place each function into its own section on those platforms
582 which support arbitrary section names and unlimited numbers of sections. */
584 int flag_function_sections = 0;
586 /* ... and similar for data. */
588 int flag_data_sections = 0;
590 /* Nonzero to inhibit use of define_optimization peephole opts. */
592 int flag_no_peephole = 0;
594 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
596 int flag_optimize_sibling_calls = 0;
598 /* Nonzero means the front end generally wants `errno' maintained by math
599 operations, like built-in SQRT. */
601 int flag_errno_math = 1;
603 /* Nonzero means that unsafe floating-point math optimizations are allowed
604 for the sake of speed. IEEE compliance is not guaranteed, and operations
605 are allowed to assume that their arguments and results are "normal"
606 (e.g., nonnegative for SQRT). */
608 int flag_unsafe_math_optimizations = 0;
610 /* Zero means that floating-point math operations cannot generate a
611 (user-visible) trap. This is the case, for example, in nonstop
612 IEEE 754 arithmetic. */
614 int flag_trapping_math = 1;
616 /* 0 means straightforward implementation of complex divide acceptable.
617 1 means wide ranges of inputs must work for complex divide.
618 2 means C99-like requirements for complex divide (not yet implemented). */
620 int flag_complex_divide_method = 0;
622 /* Nonzero means all references through pointers are volatile. */
626 /* Nonzero means treat all global and extern variables as volatile. */
628 int flag_volatile_global;
630 /* Nonzero means treat all static variables as volatile. */
632 int flag_volatile_static;
634 /* Nonzero means just do syntax checking; don't output anything. */
636 int flag_syntax_only = 0;
638 /* Nonzero means perform global cse. */
640 static int flag_gcse;
642 /* Nonzero means to use global dataflow analysis to eliminate
643 useless null pointer tests. */
645 static int flag_delete_null_pointer_checks;
647 /* Nonzero means to do the enhanced load motion during gcse, which trys
648 to hoist loads by not killing them when a store to the same location
651 int flag_gcse_lm = 1;
653 /* Nonzero means to perform store motion after gcse, which will try to
654 move stores closer to the exit block. Its not very effective without
657 int flag_gcse_sm = 1;
659 /* Nonzero means to rerun cse after loop optimization. This increases
660 compilation time about 20% and picks up a few more common expressions. */
662 static int flag_rerun_cse_after_loop;
664 /* Nonzero means to run loop optimizations twice. */
666 int flag_rerun_loop_opt;
668 /* Nonzero for -finline-functions: ok to inline functions that look like
669 good inline candidates. */
671 int flag_inline_functions;
673 /* Nonzero for -fkeep-inline-functions: even if we make a function
674 go inline everywhere, keep its definition around for debugging
677 int flag_keep_inline_functions;
679 /* Nonzero means that functions will not be inlined. */
683 /* Nonzero means that we should emit static const variables
684 regardless of whether or not optimization is turned on. */
686 int flag_keep_static_consts = 1;
688 /* Nonzero means we should be saving declaration info into a .X file. */
690 int flag_gen_aux_info = 0;
692 /* Specified name of aux-info file. */
694 static char *aux_info_file_name;
696 /* Nonzero means make the text shared if supported. */
698 int flag_shared_data;
700 /* Nonzero means schedule into delayed branch slots if supported. */
702 int flag_delayed_branch;
704 /* Nonzero if we are compiling pure (sharable) code.
705 Value is 1 if we are doing reasonable (i.e. simple
706 offset into offset table) pic. Value is 2 if we can
707 only perform register offsets. */
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 pretend it is OK to examine bits of target floats,
730 even if that isn't true. The resulting code will have incorrect constants,
731 but the same series of instructions that the native compiler would make. */
733 int flag_pretend_float;
735 /* Nonzero means change certain warnings into errors.
736 Usually these are warnings about failure to conform to some standard. */
738 int flag_pedantic_errors = 0;
740 /* flag_schedule_insns means schedule insns within basic blocks (before
742 flag_schedule_insns_after_reload means schedule insns after
745 int flag_schedule_insns = 0;
746 int flag_schedule_insns_after_reload = 0;
748 /* The following flags have effect only for scheduling before register
751 flag_schedule_interblock means schedule insns accross basic blocks.
752 flag_schedule_speculative means allow speculative motion of non-load insns.
753 flag_schedule_speculative_load means allow speculative motion of some
755 flag_schedule_speculative_load_dangerous allows speculative motion of more
758 int flag_schedule_interblock = 1;
759 int flag_schedule_speculative = 1;
760 int flag_schedule_speculative_load = 0;
761 int flag_schedule_speculative_load_dangerous = 0;
763 int flag_single_precision_constant;
765 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
766 by a cheaper branch on a count register. */
767 int flag_branch_on_count_reg = 1;
769 /* -finhibit-size-directive inhibits output of .size for ELF.
770 This is used only for compiling crtstuff.c,
771 and it may be extended to other effects
772 needed for crtstuff.c on other systems. */
773 int flag_inhibit_size_directive = 0;
775 /* -fverbose-asm causes extra commentary information to be produced in
776 the generated assembly code (to make it more readable). This option
777 is generally only of use to those who actually need to read the
778 generated assembly code (perhaps while debugging the compiler itself).
779 -fno-verbose-asm, the default, causes the extra information
780 to be omitted and is useful when comparing two assembler files. */
782 int flag_verbose_asm = 0;
784 /* -dA causes debug commentary information to be produced in
785 the generated assembly code (to make it more readable). This option
786 is generally only of use to those who actually need to read the
787 generated assembly code (perhaps while debugging the compiler itself).
788 Currently, this switch is only used by dwarfout.c; however, it is intended
789 to be a catchall for printing debug information in the assembler file. */
791 int flag_debug_asm = 0;
793 /* -dP causes the rtl to be emitted as a comment in assembly. */
795 int flag_dump_rtl_in_asm = 0;
797 /* -fgnu-linker specifies use of the GNU linker for initializations.
798 (Or, more generally, a linker that handles initializations.)
799 -fno-gnu-linker says that collect2 will be used. */
801 int flag_gnu_linker = 0;
803 int flag_gnu_linker = 1;
806 /* Nonzero means put zero initialized data in the bss section. */
807 int flag_zero_initialized_in_bss = 1;
812 /* Enable ssa conditional constant propagation. */
813 int flag_ssa_ccp = 0;
815 /* Enable ssa aggressive dead code elimination. */
816 int flag_ssa_dce = 0;
818 /* Tag all structures with __attribute__(packed). */
819 int flag_pack_struct = 0;
821 /* Emit code to check for stack overflow; also may cause large objects
822 to be allocated dynamically. */
823 int flag_stack_check;
825 /* When non-NULL, indicates that whenever space is allocated on the
826 stack, the resulting stack pointer must not pass this
827 address---that is, for stacks that grow downward, the stack pointer
828 must always be greater than or equal to this address; for stacks
829 that grow upward, the stack pointer must be less than this address.
830 At present, the rtx may be either a REG or a SYMBOL_REF, although
831 the support provided depends on the backend. */
834 /* 0 if pointer arguments may alias each other. True in C.
835 1 if pointer arguments may not alias each other but may alias
837 2 if pointer arguments may not alias each other and may not
838 alias global variables. True in Fortran.
839 This defaults to 0 for C. */
840 int flag_argument_noalias = 0;
842 /* Nonzero if we should do (language-dependent) alias analysis.
843 Typically, this analysis will assume that expressions of certain
844 types do not alias expressions of certain other types. Only used
845 if alias analysis (in general) is enabled. */
846 int flag_strict_aliasing = 0;
848 /* Instrument functions with calls at entry and exit, for profiling. */
849 int flag_instrument_function_entry_exit = 0;
851 /* Nonzero means ignore `#ident' directives. 0 means handle them.
852 On SVR4 targets, it also controls whether or not to emit a
853 string identifying the compiler. */
855 int flag_no_ident = 0;
857 /* This will perform a peephole pass before sched2. */
858 int flag_peephole2 = 0;
860 /* This will try to guess branch probabilities. */
861 int flag_guess_branch_prob = 0;
863 /* -fbounded-pointers causes gcc to compile pointers as composite
864 objects occupying three words: the pointer value, the base address
865 of the referent object, and the address immediately beyond the end
866 of the referent object. The base and extent allow us to perform
867 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
868 int flag_bounded_pointers = 0;
870 /* -fcheck-bounds causes gcc to generate array bounds checks.
871 For C, C++: defaults to value of flag_bounded_pointers.
872 For ObjC: defaults to off.
873 For Java: defaults to on.
874 For Fortran: defaults to off.
875 For CHILL: defaults to off. */
876 int flag_bounds_check = 0;
878 /* This will attempt to merge constant section constants, if 1 only
879 string constants and constants from constant pool, if 2 also constant
881 int flag_merge_constants = 1;
883 /* If one, renumber instruction UIDs to reduce the number of
884 unused UIDs if there are a lot of instructions. If greater than
885 one, unconditionally renumber instruction UIDs. */
886 int flag_renumber_insns = 1;
888 /* Values of the -falign-* flags: how much to align labels in code.
889 0 means `use default', 1 means `don't align'.
890 For each variable, there is an _log variant which is the power
891 of two not less than the variable, for .align output. */
895 int align_loops_max_skip;
898 int align_jumps_max_skip;
900 int align_labels_log;
901 int align_labels_max_skip;
903 int align_functions_log;
905 /* Table of supported debugging formats. */
908 const char *const arg;
909 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
910 constant expression, we use NO_DEBUG in its place. */
911 const enum debug_info_type debug_type;
912 const int use_extensions_p;
913 const char *const description;
917 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
918 N_("Generate debugging info in default format") },
919 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
920 #ifdef DBX_DEBUGGING_INFO
921 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
922 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
924 #ifdef DWARF_DEBUGGING_INFO
925 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
926 { "dwarf+", DWARF_DEBUG, 1,
927 N_("Generate extended DWARF-1 format debug info") },
929 #ifdef DWARF2_DEBUGGING_INFO
930 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
932 #ifdef XCOFF_DEBUGGING_INFO
933 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
934 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
936 #ifdef SDB_DEBUGGING_INFO
937 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
944 const char *const string;
947 const char *const description;
949 lang_independent_options;
953 /* Add or remove a leading underscore from user symbols. */
954 int flag_leading_underscore = -1;
956 /* The user symbol prefix after having resolved same. */
957 const char *user_label_prefix;
959 static const param_info lang_independent_params[] = {
960 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
961 { OPTION, DEFAULT, HELP },
962 #include "params.def"
967 /* A default for same. */
968 #ifndef USER_LABEL_PREFIX
969 #define USER_LABEL_PREFIX ""
972 /* Table of language-independent -f options.
973 STRING is the option name. VARIABLE is the address of the variable.
974 ON_VALUE is the value to store in VARIABLE
975 if `-fSTRING' is seen as an option.
976 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
978 static const lang_independent_options f_options[] =
980 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
981 N_("Perform DWARF2 duplicate elimination") },
982 {"float-store", &flag_float_store, 1,
983 N_("Do not store floats in registers") },
984 {"volatile", &flag_volatile, 1,
985 N_("Consider all mem refs through pointers as volatile") },
986 {"volatile-global", &flag_volatile_global, 1,
987 N_("Consider all mem refs to global data to be volatile") },
988 {"volatile-static", &flag_volatile_static, 1,
989 N_("Consider all mem refs to static data to be volatile") },
990 {"defer-pop", &flag_defer_pop, 1,
991 N_("Defer popping functions args from stack until later") },
992 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
993 N_("When possible do not generate stack frames") },
994 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
995 N_("Optimize sibling and tail recursive calls") },
996 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
997 N_("When running CSE, follow jumps to their targets") },
998 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
999 N_("When running CSE, follow conditional jumps") },
1000 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1001 N_("Perform a number of minor, expensive optimizations") },
1002 {"thread-jumps", &flag_thread_jumps, 1,
1003 N_("Perform jump threading optimizations") },
1004 {"strength-reduce", &flag_strength_reduce, 1,
1005 N_("Perform strength reduction optimizations") },
1006 {"unroll-loops", &flag_unroll_loops, 1,
1007 N_("Perform loop unrolling when iteration count is known") },
1008 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1009 N_("Perform loop unrolling for all loops") },
1010 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1011 N_("Generate prefetch instructions, if available, for arrays in loops") },
1012 {"move-all-movables", &flag_move_all_movables, 1,
1013 N_("Force all loop invariant computations out of loops") },
1014 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1015 N_("Strength reduce all loop general induction variables") },
1016 {"writable-strings", &flag_writable_strings, 1,
1017 N_("Store strings in writable data section") },
1018 {"peephole", &flag_no_peephole, 0,
1019 N_("Enable machine specific peephole optimizations") },
1020 {"force-mem", &flag_force_mem, 1,
1021 N_("Copy memory operands into registers before using") },
1022 {"force-addr", &flag_force_addr, 1,
1023 N_("Copy memory address constants into regs before using") },
1024 {"function-cse", &flag_no_function_cse, 0,
1025 N_("Allow function addresses to be held in registers") },
1026 {"inline-functions", &flag_inline_functions, 1,
1027 N_("Integrate simple functions into their callers") },
1028 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1029 N_("Generate code for funcs even if they are fully inlined") },
1030 {"inline", &flag_no_inline, 0,
1031 N_("Pay attention to the 'inline' keyword") },
1032 {"keep-static-consts", &flag_keep_static_consts, 1,
1033 N_("Emit static const variables even if they are not used") },
1034 {"syntax-only", &flag_syntax_only, 1,
1035 N_("Check for syntax errors, then stop") },
1036 {"shared-data", &flag_shared_data, 1,
1037 N_("Mark data as shared rather than private") },
1038 {"caller-saves", &flag_caller_saves, 1,
1039 N_("Enable saving registers around function calls") },
1040 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1041 N_("Return 'short' aggregates in memory, not registers") },
1042 {"reg-struct-return", &flag_pcc_struct_return, 0,
1043 N_("Return 'short' aggregates in registers") },
1044 {"delayed-branch", &flag_delayed_branch, 1,
1045 N_("Attempt to fill delay slots of branch instructions") },
1046 {"gcse", &flag_gcse, 1,
1047 N_("Perform the global common subexpression elimination") },
1048 {"gcse-lm", &flag_gcse_lm, 1,
1049 N_("Perform enhanced load motion during global subexpression elimination") },
1050 {"gcse-sm", &flag_gcse_sm, 1,
1051 N_("Perform store motion after global subexpression elimination") },
1052 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1053 N_("Run CSE pass after loop optimizations") },
1054 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1055 N_("Run the loop optimizer twice") },
1056 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1057 N_("Delete useless null pointer checks") },
1058 {"pretend-float", &flag_pretend_float, 1,
1059 N_("Pretend that host and target use the same FP format") },
1060 {"schedule-insns", &flag_schedule_insns, 1,
1061 N_("Reschedule instructions before register allocation") },
1062 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1063 N_("Reschedule instructions after register allocation") },
1064 {"sched-interblock",&flag_schedule_interblock, 1,
1065 N_("Enable scheduling across basic blocks") },
1066 {"sched-spec",&flag_schedule_speculative, 1,
1067 N_("Allow speculative motion of non-loads") },
1068 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1069 N_("Allow speculative motion of some loads") },
1070 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1071 N_("Allow speculative motion of more loads") },
1072 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1073 N_("Replace add,compare,branch with branch on count reg") },
1074 {"pic", &flag_pic, 1,
1075 N_("Generate position independent code, if possible") },
1076 {"PIC", &flag_pic, 2, ""},
1077 {"exceptions", &flag_exceptions, 1,
1078 N_("Enable exception handling") },
1079 {"unwind-tables", &flag_unwind_tables, 1,
1080 N_("Just generate unwind tables for exception handling") },
1081 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1082 N_("Generate unwind tables exact at each instruction boundary") },
1083 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1084 N_("Support synchronous non-call exceptions") },
1085 {"profile-arcs", &profile_arc_flag, 1,
1086 N_("Insert arc based program profiling code") },
1087 {"test-coverage", &flag_test_coverage, 1,
1088 N_("Create data files needed by gcov") },
1089 {"branch-probabilities", &flag_branch_probabilities, 1,
1090 N_("Use profiling information for branch probabilities") },
1091 {"reorder-blocks", &flag_reorder_blocks, 1,
1092 N_("Reorder basic blocks to improve code placement") },
1093 {"rename-registers", &flag_rename_registers, 1,
1094 N_("Do the register renaming optimization pass") },
1095 {"cprop-registers", &flag_cprop_registers, 1,
1096 N_("Do the register copy-propagation optimization pass") },
1097 {"common", &flag_no_common, 0,
1098 N_("Do not put uninitialized globals in the common section") },
1099 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1100 N_("Do not generate .size directives") },
1101 {"function-sections", &flag_function_sections, 1,
1102 N_("place each function into its own section") },
1103 {"data-sections", &flag_data_sections, 1,
1104 N_("place data items into their own section") },
1105 {"verbose-asm", &flag_verbose_asm, 1,
1106 N_("Add extra commentry to assembler output") },
1107 {"gnu-linker", &flag_gnu_linker, 1,
1108 N_("Output GNU ld formatted global initializers") },
1109 {"regmove", &flag_regmove, 1,
1110 N_("Enables a register move optimization") },
1111 {"optimize-register-move", &flag_regmove, 1,
1112 N_("Do the full regmove optimization pass") },
1113 {"pack-struct", &flag_pack_struct, 1,
1114 N_("Pack structure members together without holes") },
1115 {"stack-check", &flag_stack_check, 1,
1116 N_("Insert stack checking code into the program") },
1117 {"argument-alias", &flag_argument_noalias, 0,
1118 N_("Specify that arguments may alias each other & globals") },
1119 {"argument-noalias", &flag_argument_noalias, 1,
1120 N_("Assume arguments may alias globals but not each other") },
1121 {"argument-noalias-global", &flag_argument_noalias, 2,
1122 N_("Assume arguments do not alias each other or globals") },
1123 {"strict-aliasing", &flag_strict_aliasing, 1,
1124 N_("Assume strict aliasing rules apply") },
1125 {"align-loops", &align_loops, 0,
1126 N_("Align the start of loops") },
1127 {"align-jumps", &align_jumps, 0,
1128 N_("Align labels which are only reached by jumping") },
1129 {"align-labels", &align_labels, 0,
1130 N_("Align all labels") },
1131 {"align-functions", &align_functions, 0,
1132 N_("Align the start of functions") },
1133 {"merge-constants", &flag_merge_constants, 1,
1134 N_("Attempt to merge identical constants accross compilation units") },
1135 {"merge-all-constants", &flag_merge_constants, 2,
1136 N_("Attempt to merge identical constants and constant variables") },
1137 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1138 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1139 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1140 N_("Instrument function entry/exit with profiling calls") },
1141 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1142 N_("Put zero initialized data in the bss section") },
1143 {"ssa", &flag_ssa, 1,
1144 N_("Enable SSA optimizations") },
1145 {"ssa-ccp", &flag_ssa_ccp, 1,
1146 N_("Enable SSA conditional constant propagation") },
1147 {"ssa-dce", &flag_ssa_dce, 1,
1148 N_("Enable aggressive SSA dead code elimination") },
1149 {"leading-underscore", &flag_leading_underscore, 1,
1150 N_("External symbols have a leading underscore") },
1151 {"ident", &flag_no_ident, 0,
1152 N_("Process #ident directives") },
1153 { "peephole2", &flag_peephole2, 1,
1154 N_("Enables an rtl peephole pass run before sched2") },
1155 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1156 N_("Enables guessing of branch probabilities") },
1157 {"math-errno", &flag_errno_math, 1,
1158 N_("Set errno after built-in math functions") },
1159 {"trapping-math", &flag_trapping_math, 1,
1160 N_("Floating-point operations can trap") },
1161 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1162 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1163 {"bounded-pointers", &flag_bounded_pointers, 1,
1164 N_("Compile pointers as triples: value, base & end") },
1165 {"bounds-check", &flag_bounds_check, 1,
1166 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1167 {"single-precision-constant", &flag_single_precision_constant, 1,
1168 N_("Convert floating point constant to single precision constant") },
1169 {"time-report", &time_report, 1,
1170 N_("Report time taken by each compiler pass at end of run") },
1171 {"mem-report", &mem_report, 1,
1172 N_("Report on permanent memory allocation at end of run") },
1173 { "trapv", &flag_trapv, 1,
1174 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1177 /* Table of language-specific options. */
1179 static const struct lang_opt
1181 const char *const option;
1182 const char *const description;
1184 documented_lang_options[] =
1186 /* In order not to overload the --help output, the convention
1187 used here is to only describe those options which are not
1188 enabled by default. */
1191 N_("Compile just for ISO C89") },
1193 N_("Determine language standard") },
1195 { "-fsigned-bitfields", "" },
1196 { "-funsigned-bitfields",
1197 N_("Make bit-fields by unsigned by default") },
1198 { "-fno-signed-bitfields", "" },
1199 { "-fno-unsigned-bitfields","" },
1201 N_("Make 'char' be signed by default") },
1202 { "-funsigned-char",
1203 N_("Make 'char' be unsigned by default") },
1204 { "-fno-signed-char", "" },
1205 { "-fno-unsigned-char", "" },
1209 N_("Do not recognize the 'asm' keyword") },
1210 { "-fbuiltin", "" },
1212 N_("Do not recognize any built in functions") },
1214 N_("Assume normal C execution environment") },
1215 { "-fno-hosted", "" },
1217 N_("Assume that standard libraries & main might not exist") },
1218 { "-fno-freestanding", "" },
1219 { "-fcond-mismatch",
1220 N_("Allow different types as args of ? operator") },
1221 { "-fno-cond-mismatch", "" },
1222 { "-fdollars-in-identifiers",
1223 N_("Allow the use of $ inside identifiers") },
1224 { "-fno-dollars-in-identifiers", "" },
1225 { "-fpreprocessed", "" },
1226 { "-fno-preprocessed", "" },
1228 N_("Use the same size for double as for float") },
1229 { "-fno-short-double", "" },
1231 N_("Use the smallest fitting integer to hold enums") },
1232 { "-fno-short-enums", "" },
1234 N_("Override the underlying type for wchar_t to `unsigned short'") },
1235 { "-fno-short-wchar", "" },
1238 N_("Enable most warning messages") },
1239 { "-Wbad-function-cast",
1240 N_("Warn about casting functions to incompatible types") },
1241 { "-Wno-bad-function-cast", "" },
1242 { "-Wno-missing-noreturn", "" },
1243 { "-Wmissing-format-attribute",
1244 N_("Warn about functions which might be candidates for format attributes") },
1245 { "-Wno-missing-format-attribute", "" },
1247 N_("Warn about casts which discard qualifiers") },
1248 { "-Wno-cast-qual", "" },
1249 { "-Wchar-subscripts",
1250 N_("Warn about subscripts whose type is 'char'") },
1251 { "-Wno-char-subscripts", "" },
1253 N_("Warn if nested comments are detected") },
1254 { "-Wno-comment", "" },
1256 N_("Warn if nested comments are detected") },
1257 { "-Wno-comments", "" },
1259 N_("Warn about possibly confusing type conversions") },
1260 { "-Wno-conversion", "" },
1262 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1263 { "-Wno-format", "" },
1264 { "-Wformat-y2k", "" },
1265 { "-Wno-format-y2k",
1266 N_("Don't warn about strftime formats yielding 2 digit years") },
1267 { "-Wformat-extra-args", "" },
1268 { "-Wno-format-extra-args",
1269 N_("Don't warn about too many arguments to format functions") },
1270 { "-Wformat-nonliteral",
1271 N_("Warn about non-string-literal format strings") },
1272 { "-Wno-format-nonliteral", "" },
1273 { "-Wformat-security",
1274 N_("Warn about possible security problems with format functions") },
1275 { "-Wno-format-security", "" },
1276 { "-Wimplicit-function-declaration",
1277 N_("Warn about implicit function declarations") },
1278 { "-Wno-implicit-function-declaration", "" },
1279 { "-Werror-implicit-function-declaration", "" },
1281 N_("Warn when a declaration does not specify a type") },
1282 { "-Wno-implicit-int", "" },
1283 { "-Wimplicit", "" },
1284 { "-Wno-implicit", "" },
1286 N_("Warn about the use of the #import directive") },
1287 { "-Wno-import", "" },
1288 { "-Wlong-long","" },
1290 N_("Do not warn about using 'long long' when -pedantic") },
1292 N_("Warn about suspicious declarations of main") },
1293 { "-Wno-main", "" },
1294 { "-Wmissing-braces",
1295 N_("Warn about possibly missing braces around initializers") },
1296 { "-Wno-missing-braces", "" },
1297 { "-Wmissing-declarations",
1298 N_("Warn about global funcs without previous declarations") },
1299 { "-Wno-missing-declarations", "" },
1300 { "-Wmissing-prototypes",
1301 N_("Warn about global funcs without prototypes") },
1302 { "-Wno-missing-prototypes", "" },
1304 N_("Warn about use of multicharacter literals") },
1305 { "-Wno-multichar", "" },
1306 { "-Wnested-externs",
1307 N_("Warn about externs not at file scope level") },
1308 { "-Wno-nested-externs", "" },
1310 N_("Warn about possible missing parentheses") },
1311 { "-Wno-parentheses", "" },
1312 { "-Wsequence-point",
1313 N_("Warn about possible violations of sequence point rules") },
1314 { "-Wno-sequence-point", "" },
1315 { "-Wpointer-arith",
1316 N_("Warn about function pointer arithmetic") },
1317 { "-Wno-pointer-arith", "" },
1318 { "-Wredundant-decls",
1319 N_("Warn about multiple declarations of the same object") },
1320 { "-Wno-redundant-decls", "" },
1322 N_("Warn about signed/unsigned comparisons") },
1323 { "-Wno-sign-compare", "" },
1325 N_("Warn about testing equality of floating point numbers") },
1326 { "-Wno-float-equal", "" },
1327 { "-Wunknown-pragmas",
1328 N_("Warn about unrecognized pragmas") },
1329 { "-Wno-unknown-pragmas", "" },
1330 { "-Wstrict-prototypes",
1331 N_("Warn about non-prototyped function decls") },
1332 { "-Wno-strict-prototypes", "" },
1334 N_("Warn about constructs whose meanings change in ISO C") },
1335 { "-Wno-traditional", "" },
1337 N_("Warn when trigraphs are encountered") },
1338 { "-Wno-trigraphs", "" },
1340 { "-Wno-undef", "" },
1341 { "-Wwrite-strings",
1342 N_("Mark strings as 'const char *'") },
1343 { "-Wno-write-strings", "" },
1345 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1347 #include "options.h"
1351 /* Here is a table, controlled by the tm.h file, listing each -m switch
1352 and which bits in `target_switches' it should set or clear.
1353 If VALUE is positive, it is bits to set.
1354 If VALUE is negative, -VALUE is bits to clear.
1355 (The sign bit is not used so there is no confusion.) */
1359 const char *const name;
1361 const char *const description;
1363 target_switches [] = TARGET_SWITCHES;
1365 /* This table is similar, but allows the switch to have a value. */
1367 #ifdef TARGET_OPTIONS
1370 const char *const prefix;
1371 const char **const variable;
1372 const char *const description;
1374 target_options [] = TARGET_OPTIONS;
1377 /* Options controlling warnings. */
1379 /* Don't print warning messages. -w. */
1381 int inhibit_warnings = 0;
1383 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1385 int warn_system_headers = 0;
1387 /* Print various extra warnings. -W. */
1389 int extra_warnings = 0;
1391 /* Treat warnings as errors. -Werror. */
1393 int warnings_are_errors = 0;
1395 /* Nonzero to warn about unused variables, functions et.al. */
1397 int warn_unused_function;
1398 int warn_unused_label;
1399 int warn_unused_parameter;
1400 int warn_unused_variable;
1401 int warn_unused_value;
1403 /* Nonzero to warn about code which is never reached. */
1405 int warn_notreached;
1407 /* Nonzero to warn about variables used before they are initialized. */
1409 int warn_uninitialized;
1411 /* Nonzero means warn about all declarations which shadow others. */
1415 /* Warn if a switch on an enum fails to have a case for every enum value. */
1419 /* Nonzero means warn about function definitions that default the return type
1420 or that use a null return and have a return-type other than void. */
1422 int warn_return_type;
1424 /* Nonzero means warn about pointer casts that increase the required
1425 alignment of the target type (and might therefore lead to a crash
1426 due to a misaligned access). */
1428 int warn_cast_align;
1430 /* Nonzero means warn about any objects definitions whose size is larger
1431 than N bytes. Also want about function definitions whose returned
1432 values are larger than N bytes. The value N is in `larger_than_size'. */
1434 int warn_larger_than;
1435 HOST_WIDE_INT larger_than_size;
1437 /* Nonzero means warn if inline function is too large. */
1441 /* Warn if a function returns an aggregate,
1442 since there are often incompatible calling conventions for doing this. */
1444 int warn_aggregate_return;
1446 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1450 /* Warn when gcc pads a structure to an alignment boundary. */
1454 /* Warn when an optimization pass is disabled. */
1456 int warn_disabled_optimization;
1458 /* Warn about functions which might be candidates for attribute noreturn. */
1460 int warn_missing_noreturn;
1462 /* Nonzero means warn about uses of __attribute__((deprecated))
1465 int warn_deprecated_decl = 1;
1467 /* Likewise for -W. */
1469 static const lang_independent_options W_options[] =
1471 {"unused-function", &warn_unused_function, 1,
1472 N_("Warn when a function is unused") },
1473 {"unused-label", &warn_unused_label, 1,
1474 N_("Warn when a label is unused") },
1475 {"unused-parameter", &warn_unused_parameter, 1,
1476 N_("Warn when a function parameter is unused") },
1477 {"unused-variable", &warn_unused_variable, 1,
1478 N_("Warn when a variable is unused") },
1479 {"unused-value", &warn_unused_value, 1,
1480 N_("Warn when an expression value is unused") },
1481 {"system-headers", &warn_system_headers, 1,
1482 N_("Do not suppress warnings from system headers") },
1483 {"error", &warnings_are_errors, 1,
1484 N_("Treat all warnings as errors") },
1485 {"shadow", &warn_shadow, 1,
1486 N_("Warn when one local variable shadows another") },
1487 {"switch", &warn_switch, 1,
1488 N_("Warn about enumerated switches missing a specific case") },
1489 {"aggregate-return", &warn_aggregate_return, 1,
1490 N_("Warn about returning structures, unions or arrays") },
1491 {"cast-align", &warn_cast_align, 1,
1492 N_("Warn about pointer casts which increase alignment") },
1493 {"unreachable-code", &warn_notreached, 1,
1494 N_("Warn about code that will never be executed") },
1495 {"uninitialized", &warn_uninitialized, 1,
1496 N_("Warn about uninitialized automatic variables") },
1497 {"inline", &warn_inline, 1,
1498 N_("Warn when an inlined function cannot be inlined") },
1499 {"packed", &warn_packed, 1,
1500 N_("Warn when the packed attribute has no effect on struct layout") },
1501 {"padded", &warn_padded, 1,
1502 N_("Warn when padding is required to align struct members") },
1503 {"disabled-optimization", &warn_disabled_optimization, 1,
1504 N_("Warn when an optimization pass is disabled") },
1505 {"deprecated-declarations", &warn_deprecated_decl, 1,
1506 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1507 {"missing-noreturn", &warn_missing_noreturn, 1,
1508 N_("Warn about functions which might be candidates for attribute noreturn") }
1512 set_Wunused (setting)
1515 warn_unused_function = setting;
1516 warn_unused_label = setting;
1517 /* Unused function parameter warnings are reported when either ``-W
1518 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1519 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1521 warn_unused_parameter = 0;
1522 else if (!warn_unused_parameter)
1523 warn_unused_parameter = -1;
1524 warn_unused_variable = setting;
1525 warn_unused_value = setting;
1528 /* The following routines are useful in setting all the flags that
1529 -ffast-math and -fno-fast-math imply. */
1532 set_fast_math_flags ()
1534 flag_trapping_math = 0;
1535 flag_unsafe_math_optimizations = 1;
1536 flag_errno_math = 0;
1540 set_no_fast_math_flags ()
1542 flag_trapping_math = 1;
1543 flag_unsafe_math_optimizations = 0;
1544 flag_errno_math = 1;
1548 /* Output files for assembler code (real compiler output)
1549 and debugging dumps. */
1552 FILE *aux_info_file;
1553 FILE *rtl_dump_file = NULL;
1555 /* Decode the string P as an integral parameter.
1556 If the string is indeed an integer return its numeric value else
1557 issue an Invalid Option error for the option PNAME and return DEFVAL.
1558 If PNAME is zero just return DEFVAL, do not call error. */
1561 read_integral_parameter (p, pname, defval)
1566 const char *endp = p;
1570 if (ISDIGIT (*endp))
1579 error ("invalid option `%s'", pname);
1587 /* This is the default decl_printable_name function. */
1590 decl_name (decl, verbosity)
1592 int verbosity ATTRIBUTE_UNUSED;
1594 return IDENTIFIER_POINTER (DECL_NAME (decl));
1598 /* This calls abort and is used to avoid problems when abort if a macro.
1599 It is used when we need to pass the address of abort. */
1607 /* When `malloc.c' is compiled with `rcheck' defined,
1608 it calls this function to report clobberage. */
1612 const char *s ATTRIBUTE_UNUSED;
1617 /* Return the logarithm of X, base 2, considering X unsigned,
1618 if X is a power of 2. Otherwise, returns -1.
1620 This should be used via the `exact_log2' macro. */
1624 unsigned HOST_WIDE_INT x;
1627 /* Test for 0 or a power of 2. */
1628 if (x == 0 || x != (x & -x))
1630 while ((x >>= 1) != 0)
1635 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1636 If X is 0, return -1.
1638 This should be used via the floor_log2 macro. */
1642 unsigned HOST_WIDE_INT x;
1651 static int float_handler_set;
1653 jmp_buf float_handler;
1655 /* Signals actually come here. */
1658 float_signal (signo)
1659 /* If this is missing, some compilers complain. */
1660 int signo ATTRIBUTE_UNUSED;
1662 if (float_handled == 0)
1663 crash_signal (signo);
1666 /* On System-V derived systems, we must reinstall the signal handler.
1667 This is harmless on BSD-derived systems. */
1668 signal (SIGFPE, float_signal);
1669 longjmp (float_handler, 1);
1672 /* Specify where to longjmp to when a floating arithmetic error happens.
1673 If HANDLER is 0, it means don't handle the errors any more. */
1676 set_float_handler (handler)
1679 float_handled = (handler != 0);
1681 memcpy (float_handler, handler, sizeof (float_handler));
1683 if (float_handled && ! float_handler_set)
1685 signal (SIGFPE, float_signal);
1686 float_handler_set = 1;
1690 /* This is a wrapper function for code which might elicit an
1691 arithmetic exception. That code should be passed in as a function
1692 pointer FN, and one argument DATA. DATA is usually a struct which
1693 contains the real input and output for function FN. This function
1694 returns 0 (failure) if longjmp was called (i.e. an exception
1695 occurred.) It returns 1 (success) otherwise. */
1698 do_float_handler (fn, data)
1699 void (*fn) PARAMS ((PTR));
1706 /* We got here via longjmp () caused by an exception in function
1708 set_float_handler (NULL);
1712 set_float_handler (buf);
1714 set_float_handler (NULL);
1718 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1719 into ICE messages, which is much more user friendly. */
1722 crash_signal (signo)
1725 internal_error ("internal error: %s", strsignal (signo));
1728 /* Strip off a legitimate source ending from the input string NAME of
1729 length LEN. Rather than having to know the names used by all of
1730 our front ends, we strip off an ending of a period followed by
1731 up to five characters. (Java uses ".class".) */
1734 strip_off_ending (name, len)
1739 for (i = 2; i < 6 && len > i; i++)
1741 if (name[len - i] == '.')
1743 name[len - i] = '\0';
1749 /* Output a quoted string. */
1752 output_quoted_string (asm_file, string)
1756 #ifdef OUTPUT_QUOTED_STRING
1757 OUTPUT_QUOTED_STRING (asm_file, string);
1761 putc ('\"', asm_file);
1762 while ((c = *string++) != 0)
1766 if (c == '\"' || c == '\\')
1767 putc ('\\', asm_file);
1771 fprintf (asm_file, "\\%03o", c);
1773 putc ('\"', asm_file);
1777 /* Output a file name in the form wanted by System V. */
1780 output_file_directive (asm_file, input_name)
1782 const char *input_name;
1784 int len = strlen (input_name);
1785 const char *na = input_name + len;
1787 /* NA gets INPUT_NAME sans directory names. */
1788 while (na > input_name)
1790 if (IS_DIR_SEPARATOR (na[-1]))
1795 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1796 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1798 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1799 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1801 fprintf (asm_file, "\t.file\t");
1802 output_quoted_string (asm_file, na);
1803 fputc ('\n', asm_file);
1808 /* Routine to open a dump file. Return true if the dump file is enabled. */
1811 open_dump_file (index, decl)
1812 enum dump_file_index index;
1816 const char *open_arg;
1819 if (! dump_file[index].enabled)
1822 timevar_push (TV_DUMP);
1823 if (rtl_dump_file != NULL)
1824 fclose (rtl_dump_file);
1826 sprintf (seq, DUMPFILE_FORMAT, index);
1828 if (! dump_file[index].initialized)
1830 /* If we've not initialized the files, do so now. */
1831 if (graph_dump_format != no_graph
1832 && dump_file[index].graph_dump_p)
1834 dump_name = concat (seq, dump_file[index].extension, NULL);
1835 clean_graph_dump_file (dump_base_name, dump_name);
1838 dump_file[index].initialized = 1;
1844 dump_name = concat (dump_base_name, seq,
1845 dump_file[index].extension, NULL);
1847 rtl_dump_file = fopen (dump_name, open_arg);
1848 if (rtl_dump_file == NULL)
1849 fatal_io_error ("can't open %s", dump_name);
1854 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1855 decl_printable_name (decl, 2));
1857 timevar_pop (TV_DUMP);
1861 /* Routine to close a dump file. */
1864 close_dump_file (index, func, insns)
1865 enum dump_file_index index;
1866 void (*func) PARAMS ((FILE *, rtx));
1869 if (! rtl_dump_file)
1872 timevar_push (TV_DUMP);
1874 && graph_dump_format != no_graph
1875 && dump_file[index].graph_dump_p)
1880 sprintf (seq, DUMPFILE_FORMAT, index);
1881 suffix = concat (seq, dump_file[index].extension, NULL);
1882 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1887 func (rtl_dump_file, insns);
1889 fflush (rtl_dump_file);
1890 fclose (rtl_dump_file);
1892 rtl_dump_file = NULL;
1893 timevar_pop (TV_DUMP);
1896 /* Do any final processing required for the declarations in VEC, of
1897 which there are LEN. We write out inline functions and variables
1898 that have been deferred until this point, but which are required.
1899 Returns non-zero if anything was put out. */
1902 wrapup_global_declarations (vec, len)
1909 int output_something = 0;
1911 for (i = 0; i < len; i++)
1915 /* We're not deferring this any longer. */
1916 DECL_DEFER_OUTPUT (decl) = 0;
1918 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1919 && incomplete_decl_finalize_hook != 0)
1920 (*incomplete_decl_finalize_hook) (decl);
1923 /* Now emit any global variables or functions that we have been
1924 putting off. We need to loop in case one of the things emitted
1925 here references another one which comes earlier in the list. */
1929 for (i = 0; i < len; i++)
1933 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1936 /* Don't write out static consts, unless we still need them.
1938 We also keep static consts if not optimizing (for debugging),
1939 unless the user specified -fno-keep-static-consts.
1940 ??? They might be better written into the debug information.
1941 This is possible when using DWARF.
1943 A language processor that wants static constants to be always
1944 written out (even if it is not used) is responsible for
1945 calling rest_of_decl_compilation itself. E.g. the C front-end
1946 calls rest_of_decl_compilation from finish_decl.
1947 One motivation for this is that is conventional in some
1948 environments to write things like:
1949 static const char rcsid[] = "... version string ...";
1950 intending to force the string to be in the executable.
1952 A language processor that would prefer to have unneeded
1953 static constants "optimized away" would just defer writing
1954 them out until here. E.g. C++ does this, because static
1955 constants are often defined in header files.
1957 ??? A tempting alternative (for both C and C++) would be
1958 to force a constant to be written if and only if it is
1959 defined in a main file, as opposed to an include file. */
1961 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1962 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl))
1963 && !DECL_COMDAT (decl))
1965 && flag_keep_static_consts
1966 && !DECL_ARTIFICIAL (decl))
1967 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1970 rest_of_decl_compilation (decl, NULL, 1, 1);
1973 if (TREE_CODE (decl) == FUNCTION_DECL
1974 && DECL_INITIAL (decl) != 0
1975 && DECL_SAVED_INSNS (decl) != 0
1976 && (flag_keep_inline_functions
1977 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1978 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1981 output_inline_function (decl);
1986 output_something = 1;
1990 return output_something;
1993 /* Issue appropriate warnings for the global declarations in VEC (of
1994 which there are LEN). Output debugging information for them. */
1997 check_global_declarations (vec, len)
2004 for (i = 0; i < len; i++)
2008 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2009 && ! TREE_ASM_WRITTEN (decl))
2010 /* Cancel the RTL for this decl so that, if debugging info
2011 output for global variables is still to come,
2012 this one will be omitted. */
2013 SET_DECL_RTL (decl, NULL_RTX);
2015 /* Warn about any function
2016 declared static but not defined.
2017 We don't warn about variables,
2018 because many programs have static variables
2019 that exist only to get some text into the object file. */
2020 if (TREE_CODE (decl) == FUNCTION_DECL
2021 && (warn_unused_function
2022 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2023 && DECL_INITIAL (decl) == 0
2024 && DECL_EXTERNAL (decl)
2025 && ! DECL_ARTIFICIAL (decl)
2026 && ! TREE_PUBLIC (decl))
2028 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2029 pedwarn_with_decl (decl,
2030 "`%s' used but never defined");
2032 warning_with_decl (decl,
2033 "`%s' declared `static' but never defined");
2034 /* This symbol is effectively an "extern" declaration now. */
2035 TREE_PUBLIC (decl) = 1;
2036 assemble_external (decl);
2039 /* Warn about static fns or vars defined but not used,
2040 but not about inline functions or static consts
2041 since defining those in header files is normal practice. */
2042 if (((warn_unused_function
2043 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2044 || (warn_unused_variable
2045 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2046 && ! DECL_IN_SYSTEM_HEADER (decl)
2047 && ! DECL_EXTERNAL (decl)
2048 && ! TREE_PUBLIC (decl)
2049 && ! TREE_USED (decl)
2050 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2051 /* The TREE_USED bit for file-scope decls
2052 is kept in the identifier, to handle multiple
2053 external decls in different scopes. */
2054 && ! TREE_USED (DECL_NAME (decl)))
2055 warning_with_decl (decl, "`%s' defined but not used");
2057 timevar_push (TV_SYMOUT);
2058 (*debug_hooks->global_decl) (decl);
2059 timevar_pop (TV_SYMOUT);
2063 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2064 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2065 INPUT_FILENAME and LINENO accordingly. */
2068 push_srcloc (file, line)
2072 struct file_stack *fs;
2074 if (input_file_stack)
2076 input_file_stack->name = input_filename;
2077 input_file_stack->line = lineno;
2080 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2081 fs->name = input_filename = file;
2082 fs->line = lineno = line;
2083 fs->indent_level = 0;
2084 fs->next = input_file_stack;
2085 input_file_stack = fs;
2086 input_file_stack_tick++;
2089 /* Pop the top entry off the stack of presently open source files.
2090 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2096 struct file_stack *fs;
2098 fs = input_file_stack;
2099 input_file_stack = fs->next;
2101 input_file_stack_tick++;
2102 /* The initial source file is never popped. */
2103 if (!input_file_stack)
2105 input_filename = input_file_stack->name;
2106 lineno = input_file_stack->line;
2109 /* Compile an entire translation unit. Write a file of assembly
2110 output and various debugging dumps. */
2117 /* Initialize yet another pass. */
2119 init_final (main_input_filename);
2120 init_branch_prob (dump_base_name);
2122 timevar_push (TV_PARSE);
2124 /* Call the parser, which parses the entire file
2125 (calling rest_of_compilation for each function). */
2128 /* In case there were missing block closers,
2129 get us back to the global binding level. */
2130 (*lang_hooks.clear_binding_stack) ();
2132 /* Compilation is now finished except for writing
2133 what's left of the symbol table output. */
2135 timevar_pop (TV_PARSE);
2137 if (flag_syntax_only)
2140 globals = getdecls ();
2142 /* Really define vars that have had only a tentative definition.
2143 Really output inline functions that must actually be callable
2144 and have not been output so far. */
2147 int len = list_length (globals);
2148 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2152 /* Process the decls in reverse order--earliest first.
2153 Put them into VEC from back to front, then take out from front. */
2155 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2156 vec[len - i - 1] = decl;
2158 wrapup_global_declarations (vec, len);
2160 /* This must occur after the loop to output deferred functions. Else
2161 the profiler initializer would not be emitted if all the functions
2162 in this compilation unit were deferred.
2164 output_func_start_profiler can not cause any additional functions or
2165 data to need to be output, so it need not be in the deferred function
2167 output_func_start_profiler ();
2169 check_global_declarations (vec, len);
2175 /* Write out any pending weak symbol declarations. */
2179 /* Do dbx symbols. */
2180 timevar_push (TV_SYMOUT);
2182 #ifdef DWARF2_UNWIND_INFO
2183 if (dwarf2out_do_frame ())
2184 dwarf2out_frame_finish ();
2187 (*debug_hooks->finish) (main_input_filename);
2188 timevar_pop (TV_SYMOUT);
2190 /* Output some stuff at end of file if nec. */
2192 dw2_output_indirect_constants ();
2194 end_final (dump_base_name);
2196 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2198 timevar_push (TV_DUMP);
2199 open_dump_file (DFI_bp, NULL);
2203 close_dump_file (DFI_bp, NULL, NULL_RTX);
2204 timevar_pop (TV_DUMP);
2208 ASM_FILE_END (asm_out_file);
2211 /* Attach a special .ident directive to the end of the file to identify
2212 the version of GCC which compiled this code. The format of the .ident
2213 string is patterned after the ones produced by native SVR4 compilers. */
2216 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2217 IDENT_ASM_OP, version_string);
2220 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2222 timevar_push (TV_DUMP);
2223 dump_combine_total_stats (rtl_dump_file);
2224 close_dump_file (DFI_combine, NULL, NULL_RTX);
2225 timevar_pop (TV_DUMP);
2229 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2230 and TYPE_DECL nodes.
2232 This does nothing for local (non-static) variables, unless the
2233 variable is a register variable with an ASMSPEC. In that case, or
2234 if the variable is not an automatic, it sets up the RTL and
2235 outputs any assembler code (label definition, storage allocation
2236 and initialization).
2238 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2239 the assembler symbol name to be used. TOP_LEVEL is nonzero
2240 if this declaration is not within a function. */
2243 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2245 const char *asmspec;
2249 /* Declarations of variables, and of functions defined elsewhere. */
2251 /* The most obvious approach, to put an #ifndef around where
2252 this macro is used, doesn't work since it's inside a macro call. */
2253 #ifndef ASM_FINISH_DECLARE_OBJECT
2254 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2257 /* We deferred calling assemble_alias so that we could collect
2258 other attributes such as visibility. Emit the alias now. */
2261 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2264 alias = TREE_VALUE (TREE_VALUE (alias));
2265 alias = get_identifier (TREE_STRING_POINTER (alias));
2266 assemble_alias (decl, alias);
2270 /* Forward declarations for nested functions are not "external",
2271 but we need to treat them as if they were. */
2272 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2273 || TREE_CODE (decl) == FUNCTION_DECL)
2275 timevar_push (TV_VARCONST);
2277 /* If asmspec non-zero, we may be creating a global register variable.
2278 If asmspec zero, we may be making sure that ENCODE_SECTION_INFO is
2280 if (TREE_CODE (decl) != TYPE_DECL && TREE_CODE (decl) != LABEL_DECL)
2281 make_decl_rtl (decl, asmspec);
2283 /* Don't output anything when a tentative file-scope definition
2284 is seen. But at end of compilation, do output code for them. */
2285 if (at_end || !DECL_DEFER_OUTPUT (decl))
2286 assemble_variable (decl, top_level, at_end, 0);
2287 if (decl == last_assemble_variable_decl)
2289 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2293 timevar_pop (TV_VARCONST);
2295 else if (DECL_REGISTER (decl) && asmspec != 0)
2297 if (decode_reg_name (asmspec) >= 0)
2299 SET_DECL_RTL (decl, NULL_RTX);
2300 make_decl_rtl (decl, asmspec);
2304 error ("invalid register name `%s' for register variable", asmspec);
2305 DECL_REGISTER (decl) = 0;
2310 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2311 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2312 && TREE_CODE (decl) == TYPE_DECL)
2314 timevar_push (TV_SYMOUT);
2315 dbxout_symbol (decl, 0);
2316 timevar_pop (TV_SYMOUT);
2319 #ifdef SDB_DEBUGGING_INFO
2320 else if (write_symbols == SDB_DEBUG && top_level
2321 && TREE_CODE (decl) == TYPE_DECL)
2323 timevar_push (TV_SYMOUT);
2324 sdbout_symbol (decl, 0);
2325 timevar_pop (TV_SYMOUT);
2330 /* Called after finishing a record, union or enumeral type. */
2333 rest_of_type_compilation (type, toplev)
2334 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2338 tree type ATTRIBUTE_UNUSED;
2339 int toplev ATTRIBUTE_UNUSED;
2342 timevar_push (TV_SYMOUT);
2343 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2344 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2345 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2347 #ifdef SDB_DEBUGGING_INFO
2348 if (write_symbols == SDB_DEBUG)
2349 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2351 #ifdef DWARF2_DEBUGGING_INFO
2352 if ((write_symbols == DWARF2_DEBUG
2353 || write_symbols == VMS_AND_DWARF2_DEBUG)
2355 dwarf2out_decl (TYPE_STUB_DECL (type));
2357 timevar_pop (TV_SYMOUT);
2360 /* This is called from finish_function (within yyparse)
2361 after each top-level definition is parsed.
2362 It is supposed to compile that function or variable
2363 and output the assembler code for it.
2364 After we return, the tree storage is freed. */
2367 rest_of_compilation (decl)
2373 int rebuild_label_notes_after_reload;
2374 int register_life_up_to_date;
2376 timevar_push (TV_REST_OF_COMPILATION);
2378 /* Now that we're out of the frontend, we shouldn't have any more
2379 CONCATs anywhere. */
2380 generating_concat_p = 0;
2382 /* When processing delayed functions, prepare_function_start() won't
2383 have been run to re-initialize it. */
2384 cse_not_expected = ! optimize;
2386 /* First, make sure that NOTE_BLOCK is set correctly for each
2387 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2388 if (!cfun->x_whole_function_mode_p)
2391 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2392 tree in sensible shape. So, we just recalculate it here. */
2393 if (cfun->x_whole_function_mode_p)
2398 /* If we are reconsidering an inline function
2399 at the end of compilation, skip the stuff for making it inline. */
2401 if (DECL_SAVED_INSNS (decl) == 0)
2407 /* If this is nested inside an inlined external function, pretend
2408 it was only declared. Since we cannot inline such functions,
2409 generating code for this one is not only not necessary but will
2410 confuse some debugging output writers. */
2411 for (parent = DECL_CONTEXT (current_function_decl);
2412 parent != NULL_TREE;
2413 parent = get_containing_scope (parent))
2414 if (TREE_CODE (parent) == FUNCTION_DECL
2415 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2417 DECL_INITIAL (decl) = 0;
2418 goto exit_rest_of_compilation;
2421 /* If requested, consider whether to make this function inline. */
2422 if ((DECL_INLINE (decl) && !flag_no_inline)
2423 || flag_inline_functions)
2425 timevar_push (TV_INTEGRATION);
2426 lose = function_cannot_inline_p (decl);
2427 timevar_pop (TV_INTEGRATION);
2428 if (lose || ! optimize)
2430 if (warn_inline && DECL_INLINE (decl))
2431 warning_with_decl (decl, lose);
2432 DECL_ABSTRACT_ORIGIN (decl) = 0;
2433 /* Don't really compile an extern inline function.
2434 If we can't make it inline, pretend
2435 it was only declared. */
2436 if (DECL_EXTERNAL (decl))
2438 DECL_INITIAL (decl) = 0;
2439 goto exit_rest_of_compilation;
2443 /* ??? Note that this has the effect of making it look
2444 like "inline" was specified for a function if we choose
2445 to inline it. This isn't quite right, but it's
2446 probably not worth the trouble to fix. */
2447 inlinable = DECL_INLINE (decl) = 1;
2450 insns = get_insns ();
2452 /* Dump the rtl code if we are dumping rtl. */
2454 if (open_dump_file (DFI_rtl, decl))
2456 if (DECL_SAVED_INSNS (decl))
2457 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2458 close_dump_file (DFI_rtl, print_rtl, insns);
2461 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2462 sorts of eh initialization. Delay this until after the
2463 initial rtl dump so that we can see the original nesting. */
2464 convert_from_eh_region_ranges ();
2466 /* If function is inline, and we don't yet know whether to
2467 compile it by itself, defer decision till end of compilation.
2468 finish_compilation will call rest_of_compilation again
2469 for those functions that need to be output. Also defer those
2470 functions that we are supposed to defer. */
2473 || (DECL_INLINE (decl)
2474 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2475 && ! flag_keep_inline_functions)
2476 || DECL_EXTERNAL (decl))))
2477 DECL_DEFER_OUTPUT (decl) = 1;
2479 if (DECL_INLINE (decl))
2480 /* DWARF wants separate debugging info for abstract and
2481 concrete instances of all inline functions, including those
2482 declared inline but not inlined, and those inlined even
2483 though they weren't declared inline. Conveniently, that's
2484 what DECL_INLINE means at this point. */
2485 (*debug_hooks->deferred_inline_function) (decl);
2487 if (DECL_DEFER_OUTPUT (decl))
2489 /* If -Wreturn-type, we have to do a bit of compilation. We just
2490 want to call cleanup the cfg to figure out whether or not we can
2491 fall off the end of the function; we do the minimum amount of
2492 work necessary to make that safe. */
2493 if (warn_return_type)
2495 int saved_optimize = optimize;
2498 rebuild_jump_labels (insns);
2499 find_exception_handler_labels ();
2500 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2501 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2502 optimize = saved_optimize;
2504 /* CFG is no longer maintained up-to-date. */
2505 free_bb_for_insn ();
2508 current_function_nothrow = nothrow_function_p ();
2509 if (current_function_nothrow)
2510 /* Now we know that this can't throw; set the flag for the benefit
2511 of other functions later in this translation unit. */
2512 TREE_NOTHROW (current_function_decl) = 1;
2514 timevar_push (TV_INTEGRATION);
2515 save_for_inline (decl);
2516 timevar_pop (TV_INTEGRATION);
2517 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2518 goto exit_rest_of_compilation;
2521 /* If specified extern inline but we aren't inlining it, we are
2522 done. This goes for anything that gets here with DECL_EXTERNAL
2523 set, not just things with DECL_INLINE. */
2524 if (DECL_EXTERNAL (decl))
2525 goto exit_rest_of_compilation;
2528 /* If we're emitting a nested function, make sure its parent gets
2529 emitted as well. Doing otherwise confuses debug info. */
2532 for (parent = DECL_CONTEXT (current_function_decl);
2533 parent != NULL_TREE;
2534 parent = get_containing_scope (parent))
2535 if (TREE_CODE (parent) == FUNCTION_DECL)
2536 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2539 /* We are now committed to emitting code for this function. Do any
2540 preparation, such as emitting abstract debug info for the inline
2541 before it gets mangled by optimization. */
2542 if (DECL_INLINE (decl))
2543 (*debug_hooks->outlining_inline_function) (decl);
2545 /* Remove any notes we don't need. That will make iterating
2546 over the instruction sequence faster, and allow the garbage
2547 collector to reclaim the memory used by the notes. */
2548 remove_unnecessary_notes ();
2553 /* Initialize some variables used by the optimizers. */
2554 init_function_for_compilation ();
2556 if (! DECL_DEFER_OUTPUT (decl))
2557 TREE_ASM_WRITTEN (decl) = 1;
2559 /* Now that integrate will no longer see our rtl, we need not
2560 distinguish between the return value of this function and the
2561 return value of called functions. Also, we can remove all SETs
2562 of subregs of hard registers; they are only here because of
2563 integrate. Also, we can now initialize pseudos intended to
2564 carry magic hard reg data throughout the function. */
2565 rtx_equal_function_value_matters = 0;
2566 purge_hard_subreg_sets (get_insns ());
2567 emit_initial_value_sets ();
2569 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2570 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2571 goto exit_rest_of_compilation;
2573 /* We may have potential sibling or tail recursion sites. Select one
2574 (of possibly multiple) methods of performing the call. */
2575 if (flag_optimize_sibling_calls)
2577 timevar_push (TV_JUMP);
2578 open_dump_file (DFI_sibling, decl);
2580 optimize_sibling_and_tail_recursive_calls ();
2582 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2583 timevar_pop (TV_JUMP);
2586 /* Complete generation of exception handling code. */
2587 find_exception_handler_labels ();
2590 timevar_push (TV_JUMP);
2591 open_dump_file (DFI_eh, decl);
2593 finish_eh_generation ();
2595 close_dump_file (DFI_eh, print_rtl, get_insns ());
2596 timevar_pop (TV_JUMP);
2600 /* If we are doing position-independent code generation, now
2601 is the time to output special prologues and epilogues.
2602 We do not want to do this earlier, because it just clutters
2603 up inline functions with meaningless insns. */
2608 insns = get_insns ();
2610 /* Copy any shared structure that should not be shared. */
2611 unshare_all_rtl (current_function_decl, insns);
2613 #ifdef SETJMP_VIA_SAVE_AREA
2614 /* This must be performed before virtual register instantiation. */
2615 if (current_function_calls_alloca)
2616 optimize_save_area_alloca (insns);
2619 /* Instantiate all virtual registers. */
2620 instantiate_virtual_regs (current_function_decl, insns);
2622 open_dump_file (DFI_jump, decl);
2624 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2625 are initialized and to compute whether control can drop off the end
2628 timevar_push (TV_JUMP);
2629 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2630 before jump optimization switches branch directions. */
2631 expected_value_to_br_prob ();
2633 reg_scan (insns, max_reg_num (), 0);
2634 rebuild_jump_labels (insns);
2635 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2637 dump_flow_info (rtl_dump_file);
2638 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP);
2640 /* CFG is no longer maintained up-to-date. */
2641 free_bb_for_insn ();
2642 copy_loop_headers (insns);
2643 purge_line_number_notes (insns);
2645 timevar_pop (TV_JUMP);
2646 close_dump_file (DFI_jump, print_rtl, insns);
2648 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2649 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2651 goto exit_rest_of_compilation;
2654 /* Long term, this should probably move before the jump optimizer too,
2655 but I didn't want to disturb the rtl_dump_and_exit and related
2656 stuff at this time. */
2657 if (optimize > 0 && flag_ssa)
2659 /* Convert to SSA form. */
2661 timevar_push (TV_TO_SSA);
2662 open_dump_file (DFI_ssa, decl);
2664 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2665 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2668 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2669 timevar_pop (TV_TO_SSA);
2671 /* Perform sparse conditional constant propagation, if requested. */
2674 timevar_push (TV_SSA_CCP);
2675 open_dump_file (DFI_ssa_ccp, decl);
2679 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2680 timevar_pop (TV_SSA_CCP);
2683 /* It would be useful to cleanup the CFG at this point, but block
2684 merging and possibly other transformations might leave a PHI
2685 node in the middle of a basic block, which is a strict no-no. */
2687 /* The SSA implementation uses basic block numbers in its phi
2688 nodes. Thus, changing the control-flow graph or the basic
2689 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2690 may cause problems. */
2694 /* Remove dead code. */
2696 timevar_push (TV_SSA_DCE);
2697 open_dump_file (DFI_ssa_dce, decl);
2699 insns = get_insns ();
2700 ssa_eliminate_dead_code();
2702 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2703 timevar_pop (TV_SSA_DCE);
2706 /* Convert from SSA form. */
2708 timevar_push (TV_FROM_SSA);
2709 open_dump_file (DFI_ussa, decl);
2711 convert_from_ssa ();
2712 /* New registers have been created. Rescan their usage. */
2713 reg_scan (insns, max_reg_num (), 1);
2715 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2716 timevar_pop (TV_FROM_SSA);
2719 /* CFG is no longer maintained up-to-date. */
2720 free_bb_for_insn ();
2723 timevar_push (TV_JUMP);
2727 open_dump_file (DFI_null, decl);
2728 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2730 dump_flow_info (rtl_dump_file);
2731 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2732 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2734 /* Try to identify useless null pointer tests and delete them. */
2735 if (flag_delete_null_pointer_checks)
2736 delete_null_pointer_checks (insns);
2738 timevar_push (TV_IFCVT);
2740 timevar_pop (TV_IFCVT);
2741 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2742 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2745 /* Jump optimization, and the removal of NULL pointer checks, may
2746 have reduced the number of instructions substantially. CSE, and
2747 future passes, allocate arrays whose dimensions involve the
2748 maximum instruction UID, so if we can reduce the maximum UID
2749 we'll save big on memory. */
2750 renumber_insns (rtl_dump_file);
2752 compute_bb_for_insn (get_max_uid ());
2753 timevar_pop (TV_JUMP);
2755 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2759 /* Perform common subexpression elimination.
2760 Nonzero value from `cse_main' means that jumps were simplified
2761 and some code may now be unreachable, so do
2762 jump optimization again. */
2766 open_dump_file (DFI_cse, decl);
2768 dump_flow_info (rtl_dump_file);
2769 timevar_push (TV_CSE);
2771 reg_scan (insns, max_reg_num (), 1);
2773 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2775 rebuild_jump_labels (insns);
2776 purge_all_dead_edges (0);
2778 /* If we are not running more CSE passes, then we are no longer
2779 expecting CSE to be run. But always rerun it in a cheap mode. */
2780 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2782 if (tem || optimize > 1)
2783 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2785 /* Run this after jump optmizations remove all the unreachable code
2786 so that unreachable code will not keep values live. */
2787 delete_trivially_dead_insns (insns, max_reg_num (), 1);
2789 /* Try to identify useless null pointer tests and delete them. */
2790 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2792 timevar_push (TV_JUMP);
2794 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2795 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2797 if (flag_delete_null_pointer_checks)
2798 delete_null_pointer_checks (insns);
2799 /* CFG is no longer maintained up-to-date. */
2800 timevar_pop (TV_JUMP);
2803 /* The second pass of jump optimization is likely to have
2804 removed a bunch more instructions. */
2805 renumber_insns (rtl_dump_file);
2806 compute_bb_for_insn (get_max_uid ());
2808 timevar_pop (TV_CSE);
2809 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2812 open_dump_file (DFI_addressof, decl);
2814 purge_addressof (insns);
2816 purge_all_dead_edges (0);
2817 reg_scan (insns, max_reg_num (), 1);
2819 close_dump_file (DFI_addressof, print_rtl, insns);
2823 /* Perform global cse. */
2825 if (optimize > 0 && flag_gcse)
2827 int save_csb, save_cfj;
2830 timevar_push (TV_GCSE);
2831 open_dump_file (DFI_gcse, decl);
2833 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2834 tem = gcse_main (insns, rtl_dump_file);
2835 rebuild_jump_labels (insns);
2837 save_csb = flag_cse_skip_blocks;
2838 save_cfj = flag_cse_follow_jumps;
2839 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2841 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2843 if (flag_expensive_optimizations)
2845 timevar_push (TV_CSE);
2846 reg_scan (insns, max_reg_num (), 1);
2847 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2848 purge_all_dead_edges (0);
2849 timevar_pop (TV_CSE);
2850 cse_not_expected = !flag_rerun_cse_after_loop;
2853 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2854 things up. Then possibly re-run CSE again. */
2858 timevar_push (TV_JUMP);
2859 rebuild_jump_labels (insns);
2860 delete_trivially_dead_insns (insns, max_reg_num (), 1);
2861 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2862 timevar_pop (TV_JUMP);
2864 if (flag_expensive_optimizations)
2866 timevar_push (TV_CSE);
2867 reg_scan (insns, max_reg_num (), 1);
2868 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2869 purge_all_dead_edges (0);
2870 timevar_pop (TV_CSE);
2874 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2875 timevar_pop (TV_GCSE);
2878 flag_cse_skip_blocks = save_csb;
2879 flag_cse_follow_jumps = save_cfj;
2880 #ifdef ENABLE_CHECKING
2881 verify_flow_info ();
2885 /* Move constant computations out of loops. */
2889 timevar_push (TV_LOOP);
2890 delete_dead_jumptables ();
2891 open_dump_file (DFI_loop, decl);
2892 /* CFG is no longer maintained up-to-date. */
2893 free_bb_for_insn ();
2895 if (flag_rerun_loop_opt)
2897 cleanup_barriers ();
2899 /* We only want to perform unrolling once. */
2901 loop_optimize (insns, rtl_dump_file, 0);
2903 /* The first call to loop_optimize makes some instructions
2904 trivially dead. We delete those instructions now in the
2905 hope that doing so will make the heuristics in loop work
2906 better and possibly speed up compilation. */
2907 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2909 /* The regscan pass is currently necessary as the alias
2910 analysis code depends on this information. */
2911 reg_scan (insns, max_reg_num (), 1);
2913 cleanup_barriers ();
2914 loop_optimize (insns, rtl_dump_file,
2915 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2916 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2918 /* Loop can create trivially dead instructions. */
2919 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2920 close_dump_file (DFI_loop, print_rtl, insns);
2921 timevar_pop (TV_LOOP);
2926 /* Do control and data flow analysis; wrote some of the results to
2929 timevar_push (TV_FLOW);
2930 open_dump_file (DFI_cfg, decl);
2932 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2934 dump_flow_info (rtl_dump_file);
2935 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2936 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2938 /* It may make more sense to mark constant functions after dead code is
2939 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2940 may insert code making function non-constant, but we still must consider
2941 it as constant, otherwise -fbranch-probabilities will not read data back.
2943 life_analyzis rarely eliminates modification of external memory.
2945 mark_constant_function ();
2947 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2949 /* Do branch profiling and static profile estimation passes. */
2950 if (optimize > 0 || profile_arc_flag || flag_test_coverage
2951 || flag_branch_probabilities)
2955 timevar_push (TV_BRANCH_PROB);
2956 open_dump_file (DFI_bp, decl);
2957 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2960 /* Discover and record the loop depth at the head of each basic
2961 block. The loop infrastructure does the real job for us. */
2962 flow_loops_find (&loops, LOOP_TREE);
2964 /* Estimate using heuristics if no profiling info is available. */
2965 if (flag_guess_branch_prob)
2966 estimate_probability (&loops);
2969 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2971 flow_loops_free (&loops);
2972 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2973 timevar_pop (TV_BRANCH_PROB);
2978 timevar_push (TV_CSE2);
2979 open_dump_file (DFI_cse2, decl);
2981 dump_flow_info (rtl_dump_file);
2983 if (flag_rerun_cse_after_loop)
2985 timevar_push (TV_JUMP);
2987 reg_scan (insns, max_reg_num (), 0);
2989 timevar_push (TV_IFCVT);
2990 cleanup_cfg (CLEANUP_EXPENSIVE);
2992 timevar_pop(TV_IFCVT);
2994 timevar_pop (TV_JUMP);
2995 /* CFG is no longer maintained up-to-date. */
2996 reg_scan (insns, max_reg_num (), 0);
2997 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2998 purge_all_dead_edges (0);
3002 timevar_push (TV_JUMP);
3003 rebuild_jump_labels (insns);
3004 cleanup_cfg (CLEANUP_EXPENSIVE);
3005 timevar_pop (TV_JUMP);
3009 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3010 timevar_pop (TV_CSE2);
3015 cse_not_expected = 1;
3017 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3020 check_function_return_warnings ();
3022 #ifdef ENABLE_CHECKING
3023 verify_flow_info ();
3025 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3027 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3028 timevar_pop (TV_FLOW);
3032 if (warn_uninitialized || extra_warnings)
3034 uninitialized_vars_warning (DECL_INITIAL (decl));
3036 setjmp_args_warning ();
3042 if (initialize_uninitialized_subregs ())
3044 /* Insns were inserted, so things might look a bit different. */
3045 insns = get_insns ();
3046 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3047 PROP_LOG_LINKS | PROP_REG_INFO
3048 | PROP_DEATH_NOTES);
3052 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3056 /* If -opt, try combining insns through substitution. */
3060 int rebuild_jump_labels_after_combine = 0;
3062 timevar_push (TV_COMBINE);
3063 open_dump_file (DFI_combine, decl);
3065 rebuild_jump_labels_after_combine
3066 = combine_instructions (insns, max_reg_num ());
3068 /* Always purge dead edges, as we may eliminate an insn throwing
3070 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true);
3072 /* Combining insns may have turned an indirect jump into a
3073 direct jump. Rebuid the JUMP_LABEL fields of jumping
3075 if (rebuild_jump_labels_after_combine)
3077 timevar_push (TV_JUMP);
3078 rebuild_jump_labels (insns);
3079 timevar_pop (TV_JUMP);
3081 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3084 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3085 timevar_pop (TV_COMBINE);
3090 /* Rerun if-conversion, as combine may have simplified things enough to
3091 now meet sequence length restrictions. */
3094 timevar_push (TV_IFCVT);
3095 open_dump_file (DFI_ce, decl);
3101 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3102 timevar_pop (TV_IFCVT);
3105 /* Register allocation pre-pass, to reduce number of moves
3106 necessary for two-address machines. */
3107 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3109 timevar_push (TV_REGMOVE);
3110 open_dump_file (DFI_regmove, decl);
3112 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3114 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3115 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3116 timevar_pop (TV_REGMOVE);
3121 /* Do unconditional splitting before register allocation to allow machine
3122 description to add extra information not needed previously. */
3123 split_all_insns (1);
3125 /* Any of the several passes since flow1 will have munged register
3126 lifetime data a bit. */
3127 register_life_up_to_date = 0;
3129 #ifdef OPTIMIZE_MODE_SWITCHING
3130 timevar_push (TV_MODE_SWITCH);
3133 optimize_mode_switching (NULL);
3136 timevar_pop (TV_MODE_SWITCH);
3139 timevar_push (TV_SCHED);
3141 #ifdef INSN_SCHEDULING
3143 /* Print function header into sched dump now
3144 because doing the sched analysis makes some of the dump. */
3145 if (optimize > 0 && flag_schedule_insns)
3147 open_dump_file (DFI_sched, decl);
3149 /* Do control and data sched analysis,
3150 and write some of the results to dump file. */
3152 schedule_insns (rtl_dump_file);
3154 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3156 /* Register lifetime information was updated as part of verifying
3158 register_life_up_to_date = 1;
3161 timevar_pop (TV_SCHED);
3165 /* Determine if the current function is a leaf before running reload
3166 since this can impact optimizations done by the prologue and
3167 epilogue thus changing register elimination offsets. */
3168 current_function_is_leaf = leaf_function_p ();
3170 timevar_push (TV_LOCAL_ALLOC);
3171 open_dump_file (DFI_lreg, decl);
3173 /* Allocate pseudo-regs that are used only within 1 basic block.
3175 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3176 jump optimizer after register allocation and reloading are finished. */
3178 if (! register_life_up_to_date)
3179 recompute_reg_usage (insns, ! optimize_size);
3181 /* Allocate the reg_renumber array. */
3182 allocate_reg_info (max_regno, FALSE, TRUE);
3184 /* And the reg_equiv_memory_loc array. */
3185 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3187 allocate_initial_values (reg_equiv_memory_loc);
3189 regclass (insns, max_reg_num (), rtl_dump_file);
3190 rebuild_label_notes_after_reload = local_alloc ();
3192 timevar_pop (TV_LOCAL_ALLOC);
3194 if (dump_file[DFI_lreg].enabled)
3196 timevar_push (TV_DUMP);
3198 dump_flow_info (rtl_dump_file);
3199 dump_local_alloc (rtl_dump_file);
3201 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3202 timevar_pop (TV_DUMP);
3207 timevar_push (TV_GLOBAL_ALLOC);
3208 open_dump_file (DFI_greg, decl);
3210 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3211 pass fixing up any insns that are invalid. */
3214 failure = global_alloc (rtl_dump_file);
3217 build_insn_chain (insns);
3218 failure = reload (insns, 0);
3221 timevar_pop (TV_GLOBAL_ALLOC);
3223 if (dump_file[DFI_greg].enabled)
3225 timevar_push (TV_DUMP);
3227 dump_global_regs (rtl_dump_file);
3229 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3230 timevar_pop (TV_DUMP);
3234 goto exit_rest_of_compilation;
3238 open_dump_file (DFI_postreload, decl);
3240 /* Do a very simple CSE pass over just the hard registers. */
3243 timevar_push (TV_RELOAD_CSE_REGS);
3244 reload_cse_regs (insns);
3245 timevar_pop (TV_RELOAD_CSE_REGS);
3248 /* Register allocation and reloading may have turned an indirect jump into
3249 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3250 jumping instructions. */
3251 if (rebuild_label_notes_after_reload)
3253 timevar_push (TV_JUMP);
3255 rebuild_jump_labels (insns);
3257 timevar_pop (TV_JUMP);
3260 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3262 /* Re-create the death notes which were deleted during reload. */
3263 timevar_push (TV_FLOW2);
3264 open_dump_file (DFI_flow2, decl);
3266 #ifdef ENABLE_CHECKING
3267 verify_flow_info ();
3270 /* If optimizing, then go ahead and split insns now. */
3272 split_all_insns (0);
3274 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3276 /* On some machines, the prologue and epilogue code, or parts thereof,
3277 can be represented as RTL. Doing so lets us schedule insns between
3278 it and the rest of the code and also allows delayed branch
3279 scheduling to operate in the epilogue. */
3280 thread_prologue_and_epilogue_insns (insns);
3284 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP);
3285 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3287 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3288 even for machines with possibly nonzero RETURN_POPS_ARGS
3289 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3290 push instructions will have popping returns. */
3291 #ifndef PUSH_ROUNDING
3292 if (!ACCUMULATE_OUTGOING_ARGS)
3294 combine_stack_adjustments ();
3299 flow2_completed = 1;
3301 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3302 timevar_pop (TV_FLOW2);
3304 #ifdef HAVE_peephole2
3305 if (optimize > 0 && flag_peephole2)
3307 timevar_push (TV_PEEPHOLE2);
3308 open_dump_file (DFI_peephole2, decl);
3310 peephole2_optimize (rtl_dump_file);
3312 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3313 timevar_pop (TV_PEEPHOLE2);
3317 if (flag_rename_registers || flag_cprop_registers)
3319 timevar_push (TV_RENAME_REGISTERS);
3320 open_dump_file (DFI_rnreg, decl);
3322 if (flag_rename_registers)
3323 regrename_optimize ();
3324 if (flag_cprop_registers)
3325 copyprop_hardreg_forward ();
3327 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3328 timevar_pop (TV_RENAME_REGISTERS);
3333 timevar_push (TV_IFCVT2);
3334 open_dump_file (DFI_ce2, decl);
3338 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3339 timevar_pop (TV_IFCVT2);
3343 split_all_insns (1);
3346 #ifdef INSN_SCHEDULING
3347 if (optimize > 0 && flag_schedule_insns_after_reload)
3349 timevar_push (TV_SCHED2);
3350 open_dump_file (DFI_sched2, decl);
3352 /* Do control and data sched analysis again,
3353 and write some more of the results to dump file. */
3355 split_all_insns (1);
3357 schedule_insns (rtl_dump_file);
3359 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3360 timevar_pop (TV_SCHED2);
3366 #ifdef LEAF_REGISTERS
3367 current_function_uses_only_leaf_regs
3368 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3372 timevar_push (TV_REG_STACK);
3373 open_dump_file (DFI_stack, decl);
3375 reg_to_stack (insns, rtl_dump_file);
3377 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3378 timevar_pop (TV_REG_STACK);
3384 timevar_push (TV_REORDER_BLOCKS);
3385 open_dump_file (DFI_bbro, decl);
3387 /* Last attempt to optimize CFG, as life analyzis possibly removed
3388 some instructions. */
3389 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3390 | CLEANUP_CROSSJUMP);
3391 if (flag_reorder_blocks)
3393 reorder_basic_blocks ();
3394 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3397 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3398 timevar_pop (TV_REORDER_BLOCKS);
3400 compute_alignments ();
3402 /* CFG is no longer maintained up-to-date. */
3403 free_bb_for_insn ();
3405 /* If a machine dependent reorganization is needed, call it. */
3406 #ifdef MACHINE_DEPENDENT_REORG
3407 timevar_push (TV_MACH_DEP);
3408 open_dump_file (DFI_mach, decl);
3410 MACHINE_DEPENDENT_REORG (insns);
3412 close_dump_file (DFI_mach, print_rtl, insns);
3413 timevar_pop (TV_MACH_DEP);
3418 purge_line_number_notes (insns);
3419 cleanup_barriers ();
3421 /* If a scheduling pass for delayed branches is to be done,
3422 call the scheduling code. */
3425 if (optimize > 0 && flag_delayed_branch)
3427 timevar_push (TV_DBR_SCHED);
3428 open_dump_file (DFI_dbr, decl);
3430 dbr_schedule (insns, rtl_dump_file);
3432 close_dump_file (DFI_dbr, print_rtl, insns);
3433 timevar_pop (TV_DBR_SCHED);
3439 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3440 timevar_push (TV_SHORTEN_BRANCH);
3441 split_all_insns_noflow ();
3442 timevar_pop (TV_SHORTEN_BRANCH);
3445 convert_to_eh_region_ranges ();
3447 /* Shorten branches. */
3448 timevar_push (TV_SHORTEN_BRANCH);
3449 shorten_branches (get_insns ());
3450 timevar_pop (TV_SHORTEN_BRANCH);
3452 current_function_nothrow = nothrow_function_p ();
3453 if (current_function_nothrow)
3454 /* Now we know that this can't throw; set the flag for the benefit
3455 of other functions later in this translation unit. */
3456 TREE_NOTHROW (current_function_decl) = 1;
3458 /* Now turn the rtl into assembler code. */
3460 timevar_push (TV_FINAL);
3465 /* Get the function's name, as described by its RTL. This may be
3466 different from the DECL_NAME name used in the source file. */
3468 x = DECL_RTL (decl);
3469 if (GET_CODE (x) != MEM)
3472 if (GET_CODE (x) != SYMBOL_REF)
3474 fnname = XSTR (x, 0);
3476 assemble_start_function (decl, fnname);
3477 final_start_function (insns, asm_out_file, optimize);
3478 final (insns, asm_out_file, optimize, 0);
3479 final_end_function ();
3481 #ifdef IA64_UNWIND_INFO
3482 /* ??? The IA-64 ".handlerdata" directive must be issued before
3483 the ".endp" directive that closes the procedure descriptor. */
3484 output_function_exception_table ();
3487 assemble_end_function (decl, fnname);
3489 #ifndef IA64_UNWIND_INFO
3490 /* Otherwise, it feels unclean to switch sections in the middle. */
3491 output_function_exception_table ();
3495 fflush (asm_out_file);
3497 /* Release all memory allocated by flow. */
3498 free_basic_block_vars (0);
3500 /* Release all memory held by regsets now. */
3501 regset_release_memory ();
3503 timevar_pop (TV_FINAL);
3507 /* Write DBX symbols if requested. */
3509 /* Note that for those inline functions where we don't initially
3510 know for certain that we will be generating an out-of-line copy,
3511 the first invocation of this routine (rest_of_compilation) will
3512 skip over this code by doing a `goto exit_rest_of_compilation;'.
3513 Later on, finish_compilation will call rest_of_compilation again
3514 for those inline functions that need to have out-of-line copies
3515 generated. During that call, we *will* be routed past here. */
3517 timevar_push (TV_SYMOUT);
3518 (*debug_hooks->function_decl) (decl);
3519 timevar_pop (TV_SYMOUT);
3521 exit_rest_of_compilation:
3523 /* In case the function was not output,
3524 don't leave any temporary anonymous types
3525 queued up for sdb output. */
3526 #ifdef SDB_DEBUGGING_INFO
3527 if (write_symbols == SDB_DEBUG)
3528 sdbout_types (NULL_TREE);
3531 reload_completed = 0;
3532 flow2_completed = 0;
3535 timevar_push (TV_FINAL);
3537 /* Clear out the insn_length contents now that they are no
3539 init_insn_lengths ();
3541 /* Clear out the real_constant_chain before some of the rtx's
3542 it runs through become garbage. */
3543 clear_const_double_mem ();
3545 /* Show no temporary slots allocated. */
3548 free_basic_block_vars (0);
3549 free_bb_for_insn ();
3551 timevar_pop (TV_FINAL);
3553 /* Make sure volatile mem refs aren't considered valid operands for
3554 arithmetic insns. We must call this here if this is a nested inline
3555 function, since the above code leaves us in the init_recog state
3556 (from final.c), and the function context push/pop code does not
3557 save/restore volatile_ok.
3559 ??? Maybe it isn't necessary for expand_start_function to call this
3560 anymore if we do it here? */
3562 init_recog_no_volatile ();
3564 /* We're done with this function. Free up memory if we can. */
3565 free_after_parsing (cfun);
3566 if (! DECL_DEFER_OUTPUT (decl))
3568 free_after_compilation (cfun);
3570 /* Clear integrate.c's pointer to the cfun structure we just
3572 DECL_SAVED_INSNS (decl) = 0;
3578 timevar_pop (TV_REST_OF_COMPILATION);
3588 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3589 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3590 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3591 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3592 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3593 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"));
3595 for (i = ARRAY_SIZE (f_options); i--;)
3597 const char *description = f_options[i].description;
3599 if (description != NULL && * description != 0)
3600 printf (" -f%-21s %s\n",
3601 f_options[i].string, _(description));
3604 printf (_(" -O[number] Set optimization level to [number]\n"));
3605 printf (_(" -Os Optimize for space rather than speed\n"));
3606 for (i = LAST_PARAM; i--;)
3608 const char *description = compiler_params[i].help;
3609 const int length = 21-strlen(compiler_params[i].option);
3611 if (description != NULL && * description != 0)
3612 printf (" --param %s=<value>%.*s%s\n",
3613 compiler_params[i].option,
3614 length > 0 ? length : 1, " ",
3617 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3618 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3619 printf (_(" -w Suppress warnings\n"));
3620 printf (_(" -W Enable extra warnings\n"));
3622 for (i = ARRAY_SIZE (W_options); i--;)
3624 const char *description = W_options[i].description;
3626 if (description != NULL && * description != 0)
3627 printf (" -W%-21s %s\n",
3628 W_options[i].string, _(description));
3631 printf (_(" -Wunused Enable unused warnings\n"));
3632 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3633 printf (_(" -p Enable function profiling\n"));
3634 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3635 printf (_(" -a Enable block profiling \n"));
3637 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3638 printf (_(" -ax Enable jump profiling \n"));
3640 printf (_(" -o <file> Place output into <file> \n"));
3642 -G <number> Put global and static data smaller than <number>\n\
3643 bytes into a special section (on some targets)\n"));
3645 for (i = ARRAY_SIZE (debug_args); i--;)
3647 if (debug_args[i].description != NULL)
3648 printf (" -g%-21s %s\n",
3649 debug_args[i].arg, _(debug_args[i].description));
3652 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3653 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3654 printf (_(" -version Display the compiler's version\n"));
3655 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3656 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3657 #if defined INSN_SCHEDULING
3658 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3660 printf (_(" --help Display this information\n"));
3665 /* Display descriptions of language specific options.
3666 If there is no description, note that there is an undocumented option.
3667 If the description is empty, do not display anything. (This allows
3668 options to be deliberately undocumented, for whatever reason).
3669 If the option string is missing, then this is a marker, indicating
3670 that the description string is in fact the name of a language, whose
3671 language specific options are to follow. */
3673 if (ARRAY_SIZE (documented_lang_options) > 1)
3675 printf (_("\nLanguage specific options:\n"));
3677 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3679 const char *description = documented_lang_options[i].description;
3680 const char *option = documented_lang_options[i].option;
3682 if (description == NULL)
3687 printf (_(" %-23.23s [undocumented]\n"), option);
3689 else if (*description == 0)
3691 else if (option == NULL)
3695 (_("\nThere are undocumented %s specific options as well.\n"),
3699 printf (_("\n Options for %s:\n"), description);
3704 printf (" %-23.23s %s\n", option, _(description));
3709 printf (_("\nThere are undocumented %s specific options as well.\n"),
3712 display_target_options ();
3716 display_target_options ()
3719 static bool displayed = false;
3721 /* Avoid double printing for --help --target-help. */
3726 if (ARRAY_SIZE (target_switches) > 1
3727 #ifdef TARGET_OPTIONS
3728 || ARRAY_SIZE (target_options) > 1
3736 printf (_("\nTarget specific options:\n"));
3738 for (i = ARRAY_SIZE (target_switches); i--;)
3740 const char *option = target_switches[i].name;
3741 const char *description = target_switches[i].description;
3743 if (option == NULL || *option == 0)
3745 else if (description == NULL)
3750 printf (_(" -m%-23.23s [undocumented]\n"), option);
3752 else if (* description != 0)
3753 doc += printf (" -m%-23.23s %s\n", option, _(description));
3756 #ifdef TARGET_OPTIONS
3757 for (i = ARRAY_SIZE (target_options); i--;)
3759 const char *option = target_options[i].prefix;
3760 const char *description = target_options[i].description;
3762 if (option == NULL || *option == 0)
3764 else if (description == NULL)
3769 printf (_(" -m%-23.23s [undocumented]\n"), option);
3771 else if (* description != 0)
3772 doc += printf (" -m%-23.23s %s\n", option, _(description));
3778 printf (_("\nThere are undocumented target specific options as well.\n"));
3780 printf (_(" They exist, but they are not documented.\n"));
3785 /* Parse a -d... command line switch. */
3788 decode_d_option (arg)
3797 for (i = 0; i < (int) DFI_MAX; ++i)
3798 dump_file[i].enabled = 1;
3804 flag_print_asm_name = 1;
3807 flag_dump_rtl_in_asm = 1;
3808 flag_print_asm_name = 1;
3811 graph_dump_format = vcg;
3814 rtl_dump_and_exit = 1;
3817 (*lang_hooks.set_yydebug) (1);
3819 case 'D': /* These are handled by the preprocessor. */
3825 for (i = 0; i < (int) DFI_MAX; ++i)
3826 if (c == dump_file[i].debug_switch)
3828 dump_file[i].enabled = 1;
3833 warning ("unrecognized gcc debugging option: %c", c);
3838 /* Parse a -f... command line switch. ARG is the value after the -f.
3839 It is safe to access 'ARG - 2' to generate the full switch name.
3840 Return the number of strings consumed. */
3843 decode_f_option (arg)
3847 const char *option_value = NULL;
3849 /* Search for the option in the table of binary f options. */
3850 for (j = ARRAY_SIZE (f_options); j--;)
3852 if (!strcmp (arg, f_options[j].string))
3854 *f_options[j].variable = f_options[j].on_value;
3858 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3859 && ! strcmp (arg + 3, f_options[j].string))
3861 *f_options[j].variable = ! f_options[j].on_value;
3866 if (!strcmp (arg, "fast-math"))
3867 set_fast_math_flags ();
3868 else if (!strcmp (arg, "no-fast-math"))
3869 set_no_fast_math_flags ();
3870 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3871 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3874 read_integral_parameter (option_value, arg - 2,
3876 set_param_value ("max-inline-insns", val);
3878 #ifdef INSN_SCHEDULING
3879 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3880 fix_sched_param ("verbose", option_value);
3882 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3883 fix_register (option_value, 1, 1);
3884 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3885 fix_register (option_value, 0, 1);
3886 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3887 fix_register (option_value, 0, 0);
3888 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3889 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3890 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3892 = read_integral_parameter (option_value, arg - 2, align_functions);
3893 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3894 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3895 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3897 = read_integral_parameter (option_value, arg - 2, align_labels);
3898 else if ((option_value
3899 = skip_leading_substring (arg, "stack-limit-register=")))
3901 int reg = decode_reg_name (option_value);
3903 error ("unrecognized register name `%s'", option_value);
3905 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3907 else if ((option_value
3908 = skip_leading_substring (arg, "stack-limit-symbol=")))
3911 nm = ggc_strdup (option_value);
3912 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3914 else if ((option_value
3915 = skip_leading_substring (arg, "message-length=")))
3916 output_set_maximum_length
3917 (&global_dc->buffer, read_integral_parameter
3918 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3919 else if ((option_value
3920 = skip_leading_substring (arg, "diagnostics-show-location=")))
3922 if (!strcmp (option_value, "once"))
3923 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3924 else if (!strcmp (option_value, "every-line"))
3925 diagnostic_prefixing_rule (global_dc)
3926 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3928 error ("unrecognized option `%s'", arg - 2);
3930 else if (!strcmp (arg, "no-stack-limit"))
3931 stack_limit_rtx = NULL_RTX;
3932 else if (!strcmp (arg, "preprocessed"))
3933 /* Recognise this switch but do nothing. This prevents warnings
3934 about an unrecognized switch if cpplib has not been linked in. */
3942 /* Parse a -W... command line switch. ARG is the value after the -W.
3943 It is safe to access 'ARG - 2' to generate the full switch name.
3944 Return the number of strings consumed. */
3947 decode_W_option (arg)
3950 const char *option_value = NULL;
3953 /* Search for the option in the table of binary W options. */
3955 for (j = ARRAY_SIZE (W_options); j--;)
3957 if (!strcmp (arg, W_options[j].string))
3959 *W_options[j].variable = W_options[j].on_value;
3963 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3964 && ! strcmp (arg + 3, W_options[j].string))
3966 *W_options[j].variable = ! W_options[j].on_value;
3971 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3972 warning ("-Wid-clash-LEN is no longer supported");
3973 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3975 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3977 warn_larger_than = larger_than_size != -1;
3979 else if (!strcmp (arg, "unused"))
3983 else if (!strcmp (arg, "no-unused"))
3993 /* Parse a -g... command line switch. ARG is the value after the -g.
3994 It is safe to access 'ARG - 2' to generate the full switch name.
3995 Return the number of strings consumed. */
3998 decode_g_option (arg)
4001 static unsigned level=0;
4002 /* A lot of code assumes write_symbols == NO_DEBUG if the
4003 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4004 of what debugging type has been selected). This records the
4005 selected type. It is an error to specify more than one
4007 static enum debug_info_type selected_debug_type = NO_DEBUG;
4008 /* Non-zero if debugging format has been explicitly set.
4009 -g and -ggdb don't explicitly set the debugging format so
4010 -gdwarf -g3 is equivalent to -gdwarf3. */
4011 static int type_explicitly_set_p = 0;
4012 /* Indexed by enum debug_info_type. */
4013 static const char *const debug_type_names[] =
4015 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4018 /* The maximum admissible debug level value. */
4019 static const unsigned max_debug_level = 3;
4021 /* Look up ARG in the table. */
4022 for (da = debug_args; da->arg; da++)
4024 const int da_len = strlen (da->arg);
4026 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4028 enum debug_info_type type = da->debug_type;
4029 const char *p = arg + da_len;
4031 if (*p && ! ISDIGIT (*p))
4034 /* A debug flag without a level defaults to level 2.
4035 Note we do not want to call read_integral_parameter
4036 for that case since it will call atoi which
4039 ??? We may want to generalize the interface to
4040 read_integral_parameter to better handle this case
4041 if this case shows up often. */
4043 level = read_integral_parameter (p, 0, max_debug_level + 1);
4045 level = (level == 0) ? 2 : level;
4047 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4049 error ("use -gdwarf -g%d for DWARF v1, level %d",
4052 error ("use -gdwarf-2 for DWARF v2");
4055 if (level > max_debug_level)
4058 ignoring option `%s' due to invalid debug level specification",
4060 level = debug_info_level;
4063 if (type == NO_DEBUG)
4065 type = PREFERRED_DEBUGGING_TYPE;
4067 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4069 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4070 type = DWARF2_DEBUG;
4072 #ifdef DBX_DEBUGGING_INFO
4079 if (type == NO_DEBUG)
4080 warning ("`%s': unknown or unsupported -g option", arg - 2);
4082 /* Does it conflict with an already selected type? */
4083 if (type_explicitly_set_p
4084 /* -g/-ggdb don't conflict with anything. */
4085 && da->debug_type != NO_DEBUG
4086 && type != selected_debug_type)
4087 warning ("`%s' ignored, conflicts with `-g%s'",
4088 arg - 2, debug_type_names[(int) selected_debug_type]);
4091 /* If the format has already been set, -g/-ggdb
4092 only change the debug level. */
4093 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4094 /* Don't change debugging type. */
4098 selected_debug_type = type;
4099 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4102 write_symbols = (level == 0
4104 : selected_debug_type);
4105 use_gnu_debug_info_extensions = da->use_extensions_p;
4106 debug_info_level = (enum debug_info_level) level;
4119 /* Decode the first argument in the argv as a language-independent option.
4120 Return the number of strings consumed. */
4123 independent_decode_option (argc, argv)
4127 char *arg = argv[0];
4129 if (arg[0] != '-' || arg[1] == 0)
4141 if (!strcmp (arg, "-help"))
4144 exit_after_options = 1;
4147 if (!strcmp (arg, "-target-help"))
4149 display_target_options ();
4150 exit_after_options = 1;
4153 if (!strcmp (arg, "-version"))
4155 print_version (stderr, "");
4156 exit_after_options = 1;
4159 /* Handle '--param <name>=<value>'. */
4160 if (strcmp (arg, "-param") == 0)
4166 error ("-param option missing argument");
4170 /* Get the '<name>=<value>' parameter. */
4172 /* Look for the `='. */
4173 equal = strchr (arg, '=');
4175 error ("invalid --param option: %s", arg);
4180 /* Zero out the `=' sign so that we get two separate strings. */
4182 /* Figure out what value is specified. */
4183 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4184 if (val != INVALID_PARAM_VAL)
4185 set_param_value (arg, val);
4187 error ("invalid parameter value `%s'", equal + 1);
4202 /* Already been treated in main (). Do nothing. */
4206 set_target_switch (arg + 1);
4210 return decode_f_option (arg + 1);
4213 return decode_g_option (arg + 1);
4216 if (!strcmp (arg, "dumpbase"))
4221 dump_base_name = argv[1];
4225 decode_d_option (arg + 1);
4229 if (!strcmp (arg, "pedantic"))
4231 else if (!strcmp (arg, "pedantic-errors"))
4232 flag_pedantic_errors = pedantic = 1;
4233 else if (arg[1] == 0)
4240 if (!strcmp (arg, "quiet"))
4247 if (!strcmp (arg, "version"))
4255 inhibit_warnings = 1;
4264 /* We save the value of warn_uninitialized, since if they put
4265 -Wuninitialized on the command line, we need to generate a
4266 warning about not using it without also specifying -O. */
4267 if (warn_uninitialized != 1)
4268 warn_uninitialized = 2;
4271 return decode_W_option (arg + 1);
4275 if (!strncmp (arg, "aux-info", 8))
4282 aux_info_file_name = argv[1];
4283 flag_gen_aux_info = 1;
4286 else if (arg[8] == '=')
4288 aux_info_file_name = arg + 9;
4289 flag_gen_aux_info = 1;
4304 asm_file_name = argv[1];
4319 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4324 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4328 if (g_switch_val == -1)
4332 g_switch_set = TRUE;
4333 g_switch_value = g_switch_val;
4343 /* Decode -m switches. */
4344 /* Decode the switch -mNAME. */
4347 set_target_switch (name)
4351 int valid_target_option = 0;
4353 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4354 if (!strcmp (target_switches[j].name, name))
4356 if (target_switches[j].value < 0)
4357 target_flags &= ~-target_switches[j].value;
4359 target_flags |= target_switches[j].value;
4360 valid_target_option = 1;
4363 #ifdef TARGET_OPTIONS
4364 if (!valid_target_option)
4365 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4367 int len = strlen (target_options[j].prefix);
4368 if (!strncmp (target_options[j].prefix, name, len))
4370 *target_options[j].variable = name + len;
4371 valid_target_option = 1;
4376 if (!valid_target_option)
4377 error ("invalid option `%s'", name);
4380 /* Print version information to FILE.
4381 Each line begins with INDENT (for the case where FILE is the
4382 assembler output file). */
4385 print_version (file, indent)
4390 #define __VERSION__ "[?]"
4394 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4396 "%s%s%s version %s (%s) compiled by CC.\n"
4398 , indent, *indent != 0 ? " " : "",
4399 lang_hooks.name, version_string, TARGET_NAME,
4400 indent, __VERSION__);
4403 /* Print an option value and return the adjusted position in the line.
4404 ??? We don't handle error returns from fprintf (disk full); presumably
4405 other code will catch a disk full though. */
4408 print_single_switch (file, pos, max, indent, sep, term, type, name)
4411 const char *indent, *sep, *term, *type, *name;
4413 /* The ultrix fprintf returns 0 on success, so compute the result we want
4414 here since we need it for the following test. */
4415 int len = strlen (sep) + strlen (type) + strlen (name);
4420 fprintf (file, "%s", term);
4425 fprintf (file, "%s", indent);
4426 pos = strlen (indent);
4428 fprintf (file, "%s%s%s", sep, type, name);
4433 /* Print active target switches to FILE.
4434 POS is the current cursor position and MAX is the size of a "line".
4435 Each line begins with INDENT and ends with TERM.
4436 Each switch is separated from the next by SEP. */
4439 print_switch_values (file, pos, max, indent, sep, term)
4442 const char *indent, *sep, *term;
4447 /* Print the options as passed. */
4449 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4450 _("options passed: "), "");
4452 for (p = &save_argv[1]; *p != NULL; p++)
4456 if (strcmp (*p, "-o") == 0)
4462 if (strcmp (*p, "-quiet") == 0)
4464 if (strcmp (*p, "-version") == 0)
4469 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4472 fprintf (file, "%s", term);
4474 /* Print the -f and -m options that have been enabled.
4475 We don't handle language specific options but printing argv
4478 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4479 _("options enabled: "), "");
4481 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4482 if (*f_options[j].variable == f_options[j].on_value)
4483 pos = print_single_switch (file, pos, max, indent, sep, term,
4484 "-f", f_options[j].string);
4486 /* Print target specific options. */
4488 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4489 if (target_switches[j].name[0] != '\0'
4490 && target_switches[j].value > 0
4491 && ((target_switches[j].value & target_flags)
4492 == target_switches[j].value))
4494 pos = print_single_switch (file, pos, max, indent, sep, term,
4495 "-m", target_switches[j].name);
4498 #ifdef TARGET_OPTIONS
4499 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4500 if (*target_options[j].variable != NULL)
4503 sprintf (prefix, "-m%s", target_options[j].prefix);
4504 pos = print_single_switch (file, pos, max, indent, sep, term,
4505 prefix, *target_options[j].variable);
4509 fprintf (file, "%s", term);
4512 /* Open assembly code output file. Do this even if -fsyntax-only is
4513 on, because then the driver will have provided the name of a
4514 temporary file or bit bucket for us. NAME is the file specified on
4515 the command line, possibly NULL. */
4517 init_asm_output (name)
4520 if (name == NULL && asm_file_name == 0)
4521 asm_out_file = stdout;
4524 if (asm_file_name == 0)
4526 int len = strlen (dump_base_name);
4527 char *dumpname = (char *) xmalloc (len + 6);
4528 memcpy (dumpname, dump_base_name, len + 1);
4529 strip_off_ending (dumpname, len);
4530 strcat (dumpname, ".s");
4531 asm_file_name = dumpname;
4533 if (!strcmp (asm_file_name, "-"))
4534 asm_out_file = stdout;
4536 asm_out_file = fopen (asm_file_name, "w");
4537 if (asm_out_file == 0)
4538 fatal_io_error ("can't open %s for writing", asm_file_name);
4541 #ifdef IO_BUFFER_SIZE
4542 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4543 _IOFBF, IO_BUFFER_SIZE);
4546 if (!flag_syntax_only)
4548 #ifdef ASM_FILE_START
4549 ASM_FILE_START (asm_out_file);
4552 #ifdef ASM_COMMENT_START
4553 if (flag_verbose_asm)
4555 /* Print the list of options in effect. */
4556 print_version (asm_out_file, ASM_COMMENT_START);
4557 print_switch_values (asm_out_file, 0, MAX_LINE,
4558 ASM_COMMENT_START, " ", "\n");
4559 /* Add a blank line here so it appears in assembler output but not
4561 fprintf (asm_out_file, "\n");
4567 /* Initialization of the front end environment, before command line
4568 options are parsed. Signal handlers, internationalization etc.
4569 ARGV0 is main's argv[0]. */
4571 general_init (argv0)
4576 p = argv0 + strlen (argv0);
4577 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4581 xmalloc_set_program_name (progname);
4583 gcc_init_libintl ();
4585 /* Install handler for SIGFPE, which may be received while we do
4586 compile-time floating point arithmetic. */
4587 signal (SIGFPE, float_signal);
4589 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4591 signal (SIGSEGV, crash_signal);
4594 signal (SIGILL, crash_signal);
4597 signal (SIGBUS, crash_signal);
4600 signal (SIGABRT, crash_signal);
4602 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4603 signal (SIGIOT, crash_signal);
4606 /* Initialize the diagnostics reporting machinery, so option parsing
4607 can give warnings and errors. */
4608 diagnostic_initialize (global_dc);
4611 /* Parse command line options and set default flag values, called
4612 after language-independent option-independent initialization. Do
4613 minimal options processing. Outputting diagnostics is OK, but GC
4614 and identifier hashtables etc. are not initialized yet. */
4616 parse_options_and_default_flags (argc, argv)
4622 /* Save in case md file wants to emit args as a comment. */
4626 /* Initialize register usage now so switches may override. */
4629 /* Register the language-independent parameters. */
4630 add_params (lang_independent_params, LAST_PARAM);
4632 /* Perform language-specific options initialization. */
4633 (*lang_hooks.init_options) ();
4635 /* Scan to see what optimization level has been specified. That will
4636 determine the default value of many flags. */
4637 for (i = 1; i < argc; i++)
4639 if (!strcmp (argv[i], "-O"))
4644 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4646 /* Handle -Os, -O2, -O3, -O69, ... */
4647 char *p = &argv[i][2];
4649 if ((p[0] == 's') && (p[1] == 0))
4653 /* Optimizing for size forces optimize to be 2. */
4658 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4659 if (optimize_val != -1)
4661 optimize = optimize_val;
4670 flag_merge_constants = 0;
4676 flag_thread_jumps = 1;
4678 flag_delayed_branch = 1;
4680 #ifdef CAN_DEBUG_WITHOUT_FP
4681 flag_omit_frame_pointer = 1;
4683 flag_guess_branch_prob = 1;
4684 flag_cprop_registers = 1;
4689 flag_optimize_sibling_calls = 1;
4690 flag_cse_follow_jumps = 1;
4691 flag_cse_skip_blocks = 1;
4693 flag_expensive_optimizations = 1;
4694 flag_strength_reduce = 1;
4695 flag_rerun_cse_after_loop = 1;
4696 flag_rerun_loop_opt = 1;
4697 flag_caller_saves = 1;
4700 #ifdef INSN_SCHEDULING
4701 flag_schedule_insns = 1;
4702 flag_schedule_insns_after_reload = 1;
4705 flag_strict_aliasing = 1;
4706 flag_delete_null_pointer_checks = 1;
4707 flag_reorder_blocks = 1;
4712 flag_inline_functions = 1;
4713 flag_rename_registers = 1;
4716 if (optimize < 2 || optimize_size)
4721 align_functions = 1;
4724 /* Initialize whether `char' is signed. */
4725 flag_signed_char = DEFAULT_SIGNED_CHAR;
4726 #ifdef DEFAULT_SHORT_ENUMS
4727 /* Initialize how much space enums occupy, by default. */
4728 flag_short_enums = DEFAULT_SHORT_ENUMS;
4731 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4734 set_target_switch ("");
4736 /* Unwind tables are always present in an ABI-conformant IA-64
4737 object file, so the default should be ON. */
4738 #ifdef IA64_UNWIND_INFO
4739 flag_unwind_tables = IA64_UNWIND_INFO;
4742 #ifdef OPTIMIZATION_OPTIONS
4743 /* Allow default optimizations to be specified on a per-machine basis. */
4744 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4747 /* Perform normal command line switch decoding. */
4748 for (i = 1; i < argc;)
4751 int indep_processed;
4753 /* Give the language a chance to decode the option for itself. */
4754 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4756 if (lang_processed >= 0)
4757 /* Now see if the option also has a language independent meaning.
4758 Some options are both language specific and language independent,
4760 indep_processed = independent_decode_option (argc - i, argv + i);
4763 lang_processed = -lang_processed;
4764 indep_processed = 0;
4767 if (lang_processed || indep_processed)
4768 i += MAX (lang_processed, indep_processed);
4771 const char *option = NULL;
4772 const char *lang = NULL;
4775 /* It is possible that the command line switch is not valid for the
4776 current language, but it is valid for another language. In order
4777 to be compatible with previous versions of the compiler (which
4778 did not issue an error message in this case) we check for this
4779 possibility here. If we do find a match, then if extra_warnings
4780 is set we generate a warning message, otherwise we will just
4781 ignore the option. */
4782 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4784 option = documented_lang_options[j].option;
4787 lang = documented_lang_options[j].description;
4788 else if (! strncmp (argv[i], option, strlen (option)))
4792 if (j != ARRAY_SIZE (documented_lang_options))
4796 warning ("ignoring command line option '%s'", argv[i]);
4799 ("(it is valid for %s but not the selected language)",
4803 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4804 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4806 error ("unrecognized option `%s'", argv[i]);
4812 /* Set flag_no_inline before the post_options () hook. The C front
4813 ends use it to determine tree inlining defaults. FIXME: such
4814 code should be lang-independent when all front ends use tree
4815 inlining, in which case it, and this condition, should be moved
4816 to the top of process_options() instead. */
4819 /* Inlining does not work if not optimizing,
4820 so force it not to be done. */
4824 /* The c_decode_option function and decode_option hook set
4825 this to `2' if -Wall is used, so we can avoid giving out
4826 lots of errors for people who don't realize what -Wall does. */
4827 if (warn_uninitialized == 1)
4828 warning ("-Wuninitialized is not supported without -O");
4831 /* All command line options have been parsed; allow the front end to
4832 perform consistency checks, etc. */
4833 (*lang_hooks.post_options) ();
4836 /* Process the options that have been parsed. */
4840 #ifdef OVERRIDE_OPTIONS
4841 /* Some machines may reject certain combinations of options. */
4845 /* Set up the align_*_log variables, defaulting them to 1 if they
4846 were still unset. */
4847 if (align_loops <= 0) align_loops = 1;
4848 if (align_loops_max_skip > align_loops || !align_loops)
4849 align_loops_max_skip = align_loops - 1;
4850 align_loops_log = floor_log2 (align_loops * 2 - 1);
4851 if (align_jumps <= 0) align_jumps = 1;
4852 if (align_jumps_max_skip > align_jumps || !align_jumps)
4853 align_jumps_max_skip = align_jumps - 1;
4854 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4855 if (align_labels <= 0) align_labels = 1;
4856 align_labels_log = floor_log2 (align_labels * 2 - 1);
4857 if (align_labels_max_skip > align_labels || !align_labels)
4858 align_labels_max_skip = align_labels - 1;
4859 if (align_functions <= 0) align_functions = 1;
4860 align_functions_log = floor_log2 (align_functions * 2 - 1);
4862 /* Unrolling all loops implies that standard loop unrolling must also
4864 if (flag_unroll_all_loops)
4865 flag_unroll_loops = 1;
4866 /* Loop unrolling requires that strength_reduction be on also. Silently
4867 turn on strength reduction here if it isn't already on. Also, the loop
4868 unrolling code assumes that cse will be run after loop, so that must
4869 be turned on also. */
4870 if (flag_unroll_loops)
4872 flag_strength_reduce = 1;
4873 flag_rerun_cse_after_loop = 1;
4876 if (flag_non_call_exceptions)
4877 flag_asynchronous_unwind_tables = 1;
4878 if (flag_asynchronous_unwind_tables)
4879 flag_unwind_tables = 1;
4881 /* Warn about options that are not supported on this machine. */
4882 #ifndef INSN_SCHEDULING
4883 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4884 warning ("instruction scheduling not supported on this target machine");
4887 if (flag_delayed_branch)
4888 warning ("this target machine does not have delayed branches");
4891 /* Some operating systems do not allow profiling without a frame
4893 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4895 && flag_omit_frame_pointer)
4897 error ("profiling does not work without a frame pointer");
4898 flag_omit_frame_pointer = 0;
4901 user_label_prefix = USER_LABEL_PREFIX;
4902 if (flag_leading_underscore != -1)
4904 /* If the default prefix is more complicated than "" or "_",
4905 issue a warning and ignore this option. */
4906 if (user_label_prefix[0] == 0 ||
4907 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4909 user_label_prefix = flag_leading_underscore ? "_" : "";
4912 warning ("-f%sleading-underscore not supported on this target machine",
4913 flag_leading_underscore ? "" : "no-");
4916 /* If we are in verbose mode, write out the version and maybe all the
4917 option flags in use. */
4920 print_version (stderr, "");
4922 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4928 if (flag_syntax_only)
4930 write_symbols = NO_DEBUG;
4934 /* Now we know write_symbols, set up the debug hooks based on it.
4935 By default we do nothing for debug output. */
4936 #if defined(DBX_DEBUGGING_INFO)
4937 if (write_symbols == DBX_DEBUG)
4938 debug_hooks = &dbx_debug_hooks;
4940 #if defined(XCOFF_DEBUGGING_INFO)
4941 if (write_symbols == XCOFF_DEBUG)
4942 debug_hooks = &xcoff_debug_hooks;
4944 #ifdef SDB_DEBUGGING_INFO
4945 if (write_symbols == SDB_DEBUG)
4946 debug_hooks = &sdb_debug_hooks;
4948 #ifdef DWARF_DEBUGGING_INFO
4949 if (write_symbols == DWARF_DEBUG)
4950 debug_hooks = &dwarf_debug_hooks;
4952 #ifdef DWARF2_DEBUGGING_INFO
4953 if (write_symbols == DWARF2_DEBUG)
4954 debug_hooks = &dwarf2_debug_hooks;
4956 #ifdef VMS_DEBUGGING_INFO
4957 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4958 debug_hooks = &vmsdbg_debug_hooks;
4961 /* If auxiliary info generation is desired, open the output file.
4962 This goes in the same directory as the source file--unlike
4963 all the other output files. */
4964 if (flag_gen_aux_info)
4966 aux_info_file = fopen (aux_info_file_name, "w");
4967 if (aux_info_file == 0)
4968 fatal_io_error ("can't open %s", aux_info_file_name);
4971 if (! targetm.have_named_sections)
4973 if (flag_function_sections)
4975 warning ("-ffunction-sections not supported for this target");
4976 flag_function_sections = 0;
4978 if (flag_data_sections)
4980 warning ("-fdata-sections not supported for this target");
4981 flag_data_sections = 0;
4985 if (flag_function_sections && profile_flag)
4987 warning ("-ffunction-sections disabled; it makes profiling impossible");
4988 flag_function_sections = 0;
4991 #ifndef HAVE_prefetch
4992 if (flag_prefetch_loop_arrays)
4994 warning ("-fprefetch-loop-arrays not supported for this target");
4995 flag_prefetch_loop_arrays = 0;
4998 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5000 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5001 flag_prefetch_loop_arrays = 0;
5005 /* This combination of options isn't handled for i386 targets and doesn't
5006 make much sense anyway, so don't allow it. */
5007 if (flag_prefetch_loop_arrays && optimize_size)
5009 warning ("-fprefetch-loop-arrays is not supported with -Os");
5010 flag_prefetch_loop_arrays = 0;
5013 #ifndef OBJECT_FORMAT_ELF
5014 if (flag_function_sections && write_symbols != NO_DEBUG)
5015 warning ("-ffunction-sections may affect debugging on some targets");
5019 /* Language-independent initialization, before language-dependent
5022 lang_independent_init ()
5024 decl_printable_name = decl_name;
5025 lang_expand_expr = (lang_expand_expr_t) do_abort;
5027 /* Set the language-dependent identifier size. */
5028 tree_code_length[(int) IDENTIFIER_NODE]
5029 = ((lang_hooks.identifier_size - sizeof (struct tree_common)
5030 + sizeof (tree) - 1) / sizeof (tree));
5032 /* Initialize the garbage-collector, and string pools. */
5034 ggc_add_rtx_root (&stack_limit_rtx, 1);
5035 ggc_add_tree_root (¤t_function_decl, 1);
5036 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5041 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5042 || debug_info_level == DINFO_LEVEL_VERBOSE
5043 #ifdef VMS_DEBUGGING_INFO
5044 /* Enable line number info for traceback */
5045 || debug_info_level > DINFO_LEVEL_NONE
5047 || flag_test_coverage
5048 || warn_notreached);
5054 init_function_once ();
5055 init_stor_layout_once ();
5056 init_varasm_once ();
5057 init_EXPR_INSN_LIST_cache ();
5059 /* The following initialization functions need to generate rtl, so
5060 provide a dummy function context for them. */
5061 init_dummy_function_start ();
5064 if (flag_caller_saves)
5065 init_caller_save ();
5066 expand_dummy_function_end ();
5069 /* Language-dependent initialization. Returns non-zero on success. */
5071 lang_dependent_init (name)
5074 if (dump_base_name == 0)
5075 dump_base_name = name ? name : "gccdump";
5077 /* Front-end initialization. This hook can assume that GC,
5078 identifier hashes etc. are set up, but debug initialization is
5079 not done yet. This routine must return the original filename
5080 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5081 name = (*lang_hooks.init) (name);
5085 /* Is this duplication necessary? */
5086 name = ggc_strdup (name);
5087 main_input_filename = input_filename = name;
5088 init_asm_output (name);
5090 /* These create various _DECL nodes, so need to be called after the
5091 front end is initialized. */
5095 /* Put an entry on the input file stack for the main input file. */
5096 push_srcloc (input_filename, 0);
5098 /* If dbx symbol table desired, initialize writing it and output the
5099 predefined types. */
5100 timevar_push (TV_SYMOUT);
5102 #ifdef DWARF2_UNWIND_INFO
5103 if (dwarf2out_do_frame ())
5104 dwarf2out_frame_init ();
5107 /* Now we have the correct original filename, we can initialize
5109 (*debug_hooks->init) (name);
5111 timevar_pop (TV_SYMOUT);
5116 /* Clean up: close opened files, etc. */
5121 /* Close the dump files. */
5122 if (flag_gen_aux_info)
5124 fclose (aux_info_file);
5126 unlink (aux_info_file_name);
5129 /* Close non-debugging input and output files. Take special care to note
5130 whether fclose returns an error, since the pages might still be on the
5131 buffer chain while the file is open. */
5135 if (ferror (asm_out_file) != 0)
5136 fatal_io_error ("error writing to %s", asm_file_name);
5137 if (fclose (asm_out_file) != 0)
5138 fatal_io_error ("error closing %s", asm_file_name);
5141 /* Do whatever is necessary to finish printing the graphs. */
5142 if (graph_dump_format != no_graph)
5146 for (i = 0; i < (int) DFI_MAX; ++i)
5147 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5152 sprintf (seq, DUMPFILE_FORMAT, i);
5153 suffix = concat (seq, dump_file[i].extension, NULL);
5154 finish_graph_dump_file (dump_base_name, suffix);
5161 ggc_print_statistics ();
5162 stringpool_statistics ();
5163 dump_tree_statistics ();
5166 /* Free up memory for the benefit of leak detectors. */
5169 /* Language-specific end of compilation actions. */
5170 (*lang_hooks.finish) ();
5173 /* Initialize the compiler, and compile the input file. */
5177 /* The bulk of command line switch processing. */
5180 /* We cannot start timing until after options are processed since that
5181 says if we run timers or not. */
5183 timevar_start (TV_TOTAL);
5185 /* Language-independent initialization. Also sets up GC, identifier
5187 lang_independent_init ();
5189 /* Language-dependent initialization. Returns true on success. */
5190 if (lang_dependent_init (filename))
5195 /* Stop timing and print the times. */
5196 timevar_stop (TV_TOTAL);
5197 timevar_print (stderr);
5200 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5201 Decode command args, then call compile_file.
5202 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5203 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5205 It is not safe to call this function more than once. */
5208 toplev_main (argc, argv)
5214 /* Initialization of GCC's environment, and diagnostics. */
5215 general_init (argv [0]);
5217 /* Parse the options and do minimal processing; basically just
5218 enough to default flags appropriately. */
5219 parse_options_and_default_flags (argc, argv);
5221 /* Exit early if we can (e.g. -help). */
5222 if (!exit_after_options)
5225 if (errorcount || sorrycount)
5226 return (FATAL_EXIT_CODE);
5228 return (SUCCESS_EXIT_CODE);