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
24 /* This is the top level of cc1/c++.
25 It parses command args, opens files, invokes the various passes
26 in the proper order, and counts the time used by each.
27 Error messages and low-level interface to malloc also handled here. */
30 #undef FLOAT /* This is for hpux. They should change hpux. */
31 #undef FFS /* Some systems define this in param.h. */
36 #ifdef HAVE_SYS_RESOURCE_H
37 # include <sys/resource.h>
40 #ifdef HAVE_SYS_TIMES_H
41 # include <sys/times.h>
49 #include "insn-attr.h"
50 #include "insn-config.h"
51 #include "insn-flags.h"
52 #include "hard-reg-set.h"
59 #include "basic-block.h"
66 #include "diagnostic.h"
70 #include "dwarf2asm.h"
71 #include "integrate.h"
74 #include "langhooks.h"
76 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
77 #include "dwarf2out.h"
80 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
84 #ifdef SDB_DEBUGGING_INFO
88 #ifdef XCOFF_DEBUGGING_INFO
89 #include "xcoffout.h" /* Needed for external data
90 declarations for e.g. AIX 4.x. */
97 /* Carry information from ASM_DECLARE_OBJECT_NAME
98 to ASM_FINISH_DECLARE_OBJECT. */
100 extern int size_directive_output;
101 extern tree last_assemble_variable_decl;
103 static void general_init PARAMS ((char *));
104 static void parse_options_and_default_flags PARAMS ((int, char **));
105 static void do_compile PARAMS ((void));
106 static void process_options PARAMS ((void));
107 static void lang_independent_init PARAMS ((void));
108 static int lang_dependent_init PARAMS ((const char *));
109 static void init_asm_output PARAMS ((const char *));
110 static void finalize PARAMS ((void));
112 static void set_target_switch PARAMS ((const char *));
113 static const char *decl_name PARAMS ((tree, int));
115 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
116 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
117 static void set_float_handler PARAMS ((jmp_buf));
118 static void compile_file PARAMS ((void));
119 static void display_help PARAMS ((void));
120 static void display_target_options PARAMS ((void));
122 static void decode_d_option PARAMS ((const char *));
123 static int decode_f_option PARAMS ((const char *));
124 static int decode_W_option PARAMS ((const char *));
125 static int decode_g_option PARAMS ((const char *));
126 static unsigned int independent_decode_option PARAMS ((int, char **));
128 static void print_version PARAMS ((FILE *, const char *));
129 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
130 const char *, const char *,
131 const char *, const char *));
132 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
133 const char *, const char *));
135 /* Length of line when printing switch values. */
138 /* Name of program invoked, sans directories. */
140 const char *progname;
142 /* Copy of arguments to toplev_main. */
146 /* Name of current original source file (what was input to cpp).
147 This comes from each #-command in the actual input. */
149 const char *input_filename;
151 /* Name of top-level original source file (what was input to cpp).
152 This comes from the #-command at the beginning of the actual input.
153 If there isn't any there, then this is the cc1 input file name. */
155 const char *main_input_filename;
157 /* Current line number in real source file. */
161 /* Nonzero if it is unsafe to create any new pseudo registers. */
164 /* Stack of currently pending input files. */
166 struct file_stack *input_file_stack;
168 /* Incremented on each change to input_file_stack. */
169 int input_file_stack_tick;
171 /* Name to use as base of names for dump output files. */
173 const char *dump_base_name;
175 /* Format to use to print dumpfile index value */
176 #ifndef DUMPFILE_FORMAT
177 #define DUMPFILE_FORMAT ".%02d."
180 /* Bit flags that specify the machine subtype we are compiling for.
181 Bits are tested using macros TARGET_... defined in the tm.h file
182 and set by `-m...' switches. Must be defined in rtlanal.c. */
184 extern int target_flags;
186 /* Debug hooks - dependent upon command line options. */
188 struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
190 /* Describes a dump file. */
192 struct dump_file_info
194 /* The unique extension to apply, e.g. ".jump". */
195 const char *const extension;
197 /* The -d<c> character that enables this dump file. */
198 char const debug_switch;
200 /* True if there is a corresponding graph dump file. */
201 char const graph_dump_p;
203 /* True if the user selected this dump. */
206 /* True if the files have been initialized (ie truncated). */
210 /* Enumerate the extant dump files. */
249 /* Describes all the dump files. Should be kept in order of the
250 pass and in sync with dump_file_index above.
252 Remaining -d letters:
258 static struct dump_file_info dump_file[DFI_MAX] =
260 { "rtl", 'r', 0, 0, 0 },
261 { "sibling", 'i', 0, 0, 0 },
262 { "eh", 'h', 0, 0, 0 },
263 { "jump", 'j', 0, 0, 0 },
264 { "ssa", 'e', 1, 0, 0 },
265 { "ssaccp", 'W', 1, 0, 0 },
266 { "ssadce", 'X', 1, 0, 0 },
267 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
268 { "cse", 's', 0, 0, 0 },
269 { "addressof", 'F', 0, 0, 0 },
270 { "gcse", 'G', 1, 0, 0 },
271 { "loop", 'L', 1, 0, 0 },
272 { "cse2", 't', 1, 0, 0 },
273 { "cfg", 'f', 1, 0, 0 },
274 { "bp", 'b', 1, 0, 0 },
275 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
276 { "combine", 'c', 1, 0, 0 },
277 { "ce", 'C', 1, 0, 0 },
278 { "regmove", 'N', 1, 0, 0 },
279 { "sched", 'S', 1, 0, 0 },
280 { "lreg", 'l', 1, 0, 0 },
281 { "greg", 'g', 1, 0, 0 },
282 { "postreload", 'o', 1, 0, 0 },
283 { "flow2", 'w', 1, 0, 0 },
284 { "peephole2", 'z', 1, 0, 0 },
285 { "rnreg", 'n', 1, 0, 0 },
286 { "ce2", 'E', 1, 0, 0 },
287 { "sched2", 'R', 1, 0, 0 },
288 { "stack", 'k', 1, 0, 0 },
289 { "bbro", 'B', 1, 0, 0 },
290 { "mach", 'M', 1, 0, 0 },
291 { "dbr", 'd', 0, 0, 0 },
294 static int open_dump_file PARAMS ((enum dump_file_index, tree));
295 static void close_dump_file PARAMS ((enum dump_file_index,
296 void (*) (FILE *, rtx), rtx));
298 /* Other flags saying which kinds of debugging dump have been requested. */
300 int rtl_dump_and_exit;
301 int flag_print_asm_name;
302 static int version_flag;
303 static char *filename;
304 enum graph_dump_types graph_dump_format;
306 /* Name for output file of assembly code, specified with -o. */
310 /* Value of the -G xx switch, and whether it was passed or not. */
314 /* Type(s) of debugging information we are producing (if any).
315 See flags.h for the definitions of the different possible
316 types of debugging information. */
317 enum debug_info_type write_symbols = NO_DEBUG;
319 /* Level of debugging information we are producing. See flags.h
320 for the definitions of the different possible levels. */
321 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
323 /* Nonzero means use GNU-only extensions in the generated symbolic
324 debugging information. */
325 /* Currently, this only has an effect when write_symbols is set to
326 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
327 int use_gnu_debug_info_extensions = 0;
329 /* Nonzero means do optimizations. -O.
330 Particular numeric values stand for particular amounts of optimization;
331 thus, -O2 stores 2 here. However, the optimizations beyond the basic
332 ones are not controlled directly by this variable. Instead, they are
333 controlled by individual `flag_...' variables that are defaulted
334 based on this variable. */
338 /* Nonzero means optimize for size. -Os.
339 The only valid values are zero and non-zero. When optimize_size is
340 non-zero, optimize defaults to 2, but certain individual code
341 bloating optimizations are disabled. */
343 int optimize_size = 0;
345 /* Nonzero if we should exit after parsing options. */
346 static int exit_after_options = 0;
348 /* The FUNCTION_DECL for the function currently being compiled,
349 or 0 if between functions. */
350 tree current_function_decl;
352 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
354 tree current_function_func_begin_label;
356 /* Pointer to function to compute the name to use to print a declaration.
357 DECL is the declaration in question.
358 VERBOSITY determines what information will be printed:
359 0: DECL_NAME, demangled as necessary.
360 1: and scope information.
361 2: and any other information that might be interesting, such as function
362 parameter types in C++. */
364 const char *(*decl_printable_name) PARAMS ((tree, int));
366 /* Pointer to function to compute rtl for a language-specific tree code. */
368 typedef rtx (*lang_expand_expr_t)
369 PARAMS ((union tree_node *, rtx, enum machine_mode,
370 enum expand_modifier modifier));
372 lang_expand_expr_t lang_expand_expr = 0;
374 /* Pointer to function to finish handling an incomplete decl at the
375 end of compilation. */
377 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
379 /* Nonzero if doing dwarf2 duplicate elimination. */
381 int flag_eliminate_dwarf2_dups = 0;
383 /* Nonzero if generating code to do profiling. */
385 int profile_flag = 0;
387 /* Nonzero if generating code to profile program flow graph arcs. */
389 int profile_arc_flag = 0;
391 /* Nonzero if generating info for gcov to calculate line test coverage. */
393 int flag_test_coverage = 0;
395 /* Nonzero indicates that branch taken probabilities should be calculated. */
397 int flag_branch_probabilities = 0;
399 /* Nonzero if basic blocks should be reordered. */
401 int flag_reorder_blocks = 0;
403 /* Nonzero if registers should be renamed. */
405 int flag_rename_registers = 0;
406 int flag_cprop_registers = 0;
408 /* Nonzero for -pedantic switch: warn about anything
409 that standard spec forbids. */
413 /* Temporarily suppress certain warnings.
414 This is set while reading code from a system header file. */
416 int in_system_header = 0;
418 /* Don't print functions as they are compiled. -quiet. */
422 /* Print times taken by the various passes. -ftime-report. */
426 /* Print memory still in use at end of compilation (which may have little
427 to do with peak memory consumption). -fmem-report. */
431 /* Non-zero means to collect statistics which might be expensive
432 and to print them when we are done. */
433 int flag_detailed_statistics = 0;
438 /* Nonzero means `char' should be signed. */
440 int flag_signed_char;
442 /* Nonzero means give an enum type only as many bytes as it needs. */
444 int flag_short_enums;
446 /* Nonzero for -fcaller-saves: allocate values in regs that need to
447 be saved across function calls, if that produces overall better code.
448 Optional now, so people can test it. */
450 #ifdef DEFAULT_CALLER_SAVES
451 int flag_caller_saves = 1;
453 int flag_caller_saves = 0;
456 /* Nonzero if structures and unions should be returned in memory.
458 This should only be defined if compatibility with another compiler or
459 with an ABI is needed, because it results in slower code. */
461 #ifndef DEFAULT_PCC_STRUCT_RETURN
462 #define DEFAULT_PCC_STRUCT_RETURN 1
465 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
467 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
469 /* Nonzero for -fforce-mem: load memory value into a register
470 before arithmetic on it. This makes better cse but slower compilation. */
472 int flag_force_mem = 0;
474 /* Nonzero for -fforce-addr: load memory address into a register before
475 reference to memory. This makes better cse but slower compilation. */
477 int flag_force_addr = 0;
479 /* Nonzero for -fdefer-pop: don't pop args after each function call;
480 instead save them up to pop many calls' args with one insns. */
482 int flag_defer_pop = 0;
484 /* Nonzero for -ffloat-store: don't allocate floats and doubles
485 in extended-precision registers. */
487 int flag_float_store = 0;
489 /* Nonzero for -fcse-follow-jumps:
490 have cse follow jumps to do a more extensive job. */
492 int flag_cse_follow_jumps;
494 /* Nonzero for -fcse-skip-blocks:
495 have cse follow a branch around a block. */
496 int flag_cse_skip_blocks;
498 /* Nonzero for -fexpensive-optimizations:
499 perform miscellaneous relatively-expensive optimizations. */
500 int flag_expensive_optimizations;
502 /* Nonzero for -fthread-jumps:
503 have jump optimize output of loop. */
505 int flag_thread_jumps;
507 /* Nonzero enables strength-reduction in loop.c. */
509 int flag_strength_reduce = 0;
511 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
512 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
513 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
516 int flag_unroll_loops;
518 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
519 This is generally not a win. */
521 int flag_unroll_all_loops;
523 /* Nonzero enables prefetch optimizations for arrays in loops. */
525 int flag_prefetch_loop_arrays;
527 /* Nonzero forces all invariant computations in loops to be moved
530 int flag_move_all_movables = 0;
532 /* Nonzero forces all general induction variables in loops to be
535 int flag_reduce_all_givs = 0;
537 /* Nonzero to perform full register move optimization passes. This is the
540 int flag_regmove = 0;
542 /* Nonzero for -fwritable-strings:
543 store string constants in data segment and don't uniquize them. */
545 int flag_writable_strings = 0;
547 /* Nonzero means don't put addresses of constant functions in registers.
548 Used for compiling the Unix kernel, where strange substitutions are
549 done on the assembly output. */
551 int flag_no_function_cse = 0;
553 /* Nonzero for -fomit-frame-pointer:
554 don't make a frame pointer in simple functions that don't require one. */
556 int flag_omit_frame_pointer = 0;
558 /* Nonzero means place each function into its own section on those platforms
559 which support arbitrary section names and unlimited numbers of sections. */
561 int flag_function_sections = 0;
563 /* ... and similar for data. */
565 int flag_data_sections = 0;
567 /* Nonzero to inhibit use of define_optimization peephole opts. */
569 int flag_no_peephole = 0;
571 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
573 int flag_optimize_sibling_calls = 0;
575 /* Nonzero means the front end generally wants `errno' maintained by math
576 operations, like built-in SQRT. */
578 int flag_errno_math = 1;
580 /* Nonzero means that unsafe floating-point math optimizations are allowed
581 for the sake of speed. IEEE compliance is not guaranteed, and operations
582 are allowed to assume that their arguments and results are "normal"
583 (e.g., nonnegative for SQRT). */
585 int flag_unsafe_math_optimizations = 0;
587 /* Zero means that floating-point math operations cannot generate a
588 (user-visible) trap. This is the case, for example, in nonstop
589 IEEE 754 arithmetic. */
591 int flag_trapping_math = 1;
593 /* 0 means straightforward implementation of complex divide acceptable.
594 1 means wide ranges of inputs must work for complex divide.
595 2 means C99-like requirements for complex divide (not yet implemented). */
597 int flag_complex_divide_method = 0;
599 /* Nonzero means all references through pointers are volatile. */
603 /* Nonzero means treat all global and extern variables as volatile. */
605 int flag_volatile_global;
607 /* Nonzero means treat all static variables as volatile. */
609 int flag_volatile_static;
611 /* Nonzero means just do syntax checking; don't output anything. */
613 int flag_syntax_only = 0;
615 /* Nonzero means perform global cse. */
617 static int flag_gcse;
619 /* Nonzero means to use global dataflow analysis to eliminate
620 useless null pointer tests. */
622 static int flag_delete_null_pointer_checks;
624 /* Nonzero means to do the enhanced load motion during gcse, which trys
625 to hoist loads by not killing them when a store to the same location
628 int flag_gcse_lm = 1;
630 /* Nonzero means to perform store motion after gcse, which will try to
631 move stores closer to the exit block. Its not very effective without
634 int flag_gcse_sm = 1;
636 /* Nonzero means to rerun cse after loop optimization. This increases
637 compilation time about 20% and picks up a few more common expressions. */
639 static int flag_rerun_cse_after_loop;
641 /* Nonzero means to run loop optimizations twice. */
643 int flag_rerun_loop_opt;
645 /* Nonzero for -finline-functions: ok to inline functions that look like
646 good inline candidates. */
648 int flag_inline_functions;
650 /* Nonzero for -fkeep-inline-functions: even if we make a function
651 go inline everywhere, keep its definition around for debugging
654 int flag_keep_inline_functions;
656 /* Nonzero means that functions will not be inlined. */
658 int flag_no_inline = 2;
660 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
661 not just because the tree inliner turned us off. */
663 int flag_really_no_inline = 2;
665 /* Nonzero means that we should emit static const variables
666 regardless of whether or not optimization is turned on. */
668 int flag_keep_static_consts = 1;
670 /* Nonzero means we should be saving declaration info into a .X file. */
672 int flag_gen_aux_info = 0;
674 /* Specified name of aux-info file. */
676 static char *aux_info_file_name;
678 /* Nonzero means make the text shared if supported. */
680 int flag_shared_data;
682 /* Nonzero means schedule into delayed branch slots if supported. */
684 int flag_delayed_branch;
686 /* Nonzero if we are compiling pure (sharable) code.
687 Value is 1 if we are doing reasonable (i.e. simple
688 offset into offset table) pic. Value is 2 if we can
689 only perform register offsets. */
693 /* Nonzero means generate extra code for exception handling and enable
694 exception handling. */
698 /* Nonzero means generate frame unwind info table when supported. */
700 int flag_unwind_tables = 0;
702 /* Nonzero means generate frame unwind info table exact at each insn boundary */
704 int flag_asynchronous_unwind_tables = 0;
706 /* Nonzero means don't place uninitialized global data in common storage
711 /* Nonzero means pretend it is OK to examine bits of target floats,
712 even if that isn't true. The resulting code will have incorrect constants,
713 but the same series of instructions that the native compiler would make. */
715 int flag_pretend_float;
717 /* Nonzero means change certain warnings into errors.
718 Usually these are warnings about failure to conform to some standard. */
720 int flag_pedantic_errors = 0;
722 /* flag_schedule_insns means schedule insns within basic blocks (before
724 flag_schedule_insns_after_reload means schedule insns after
727 int flag_schedule_insns = 0;
728 int flag_schedule_insns_after_reload = 0;
730 /* The following flags have effect only for scheduling before register
733 flag_schedule_interblock means schedule insns accross basic blocks.
734 flag_schedule_speculative means allow speculative motion of non-load insns.
735 flag_schedule_speculative_load means allow speculative motion of some
737 flag_schedule_speculative_load_dangerous allows speculative motion of more
740 int flag_schedule_interblock = 1;
741 int flag_schedule_speculative = 1;
742 int flag_schedule_speculative_load = 0;
743 int flag_schedule_speculative_load_dangerous = 0;
745 int flag_single_precision_constant;
747 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
748 by a cheaper branch on a count register. */
749 int flag_branch_on_count_reg = 1;
751 /* -finhibit-size-directive inhibits output of .size for ELF.
752 This is used only for compiling crtstuff.c,
753 and it may be extended to other effects
754 needed for crtstuff.c on other systems. */
755 int flag_inhibit_size_directive = 0;
757 /* -fverbose-asm causes extra commentary information to be produced in
758 the generated assembly code (to make it more readable). This option
759 is generally only of use to those who actually need to read the
760 generated assembly code (perhaps while debugging the compiler itself).
761 -fno-verbose-asm, the default, causes the extra information
762 to be omitted and is useful when comparing two assembler files. */
764 int flag_verbose_asm = 0;
766 /* -dA causes debug commentary information to be produced in
767 the generated assembly code (to make it more readable). This option
768 is generally only of use to those who actually need to read the
769 generated assembly code (perhaps while debugging the compiler itself).
770 Currently, this switch is only used by dwarfout.c; however, it is intended
771 to be a catchall for printing debug information in the assembler file. */
773 int flag_debug_asm = 0;
775 /* -dP causes the rtl to be emitted as a comment in assembly. */
777 int flag_dump_rtl_in_asm = 0;
779 /* -fgnu-linker specifies use of the GNU linker for initializations.
780 (Or, more generally, a linker that handles initializations.)
781 -fno-gnu-linker says that collect2 will be used. */
783 int flag_gnu_linker = 0;
785 int flag_gnu_linker = 1;
791 /* Enable ssa conditional constant propagation. */
792 int flag_ssa_ccp = 0;
794 /* Enable ssa aggressive dead code elimination. */
795 int flag_ssa_dce = 0;
797 /* Tag all structures with __attribute__(packed). */
798 int flag_pack_struct = 0;
800 /* Nonzero means that -Wformat accepts certain system-dependent formats. */
801 int flag_format_extensions = 0;
803 /* Emit code to check for stack overflow; also may cause large objects
804 to be allocated dynamically. */
805 int flag_stack_check;
807 /* When non-NULL, indicates that whenever space is allocated on the
808 stack, the resulting stack pointer must not pass this
809 address---that is, for stacks that grow downward, the stack pointer
810 must always be greater than or equal to this address; for stacks
811 that grow upward, the stack pointer must be less than this address.
812 At present, the rtx may be either a REG or a SYMBOL_REF, although
813 the support provided depends on the backend. */
816 /* 0 if pointer arguments may alias each other. True in C.
817 1 if pointer arguments may not alias each other but may alias
819 2 if pointer arguments may not alias each other and may not
820 alias global variables. True in Fortran.
821 This defaults to 0 for C. */
822 int flag_argument_noalias = 0;
824 /* Nonzero if we should do (language-dependent) alias analysis.
825 Typically, this analysis will assume that expressions of certain
826 types do not alias expressions of certain other types. Only used
827 if alias analysis (in general) is enabled. */
828 int flag_strict_aliasing = 0;
830 /* Instrument functions with calls at entry and exit, for profiling. */
831 int flag_instrument_function_entry_exit = 0;
833 /* Nonzero means ignore `#ident' directives. 0 means handle them.
834 On SVR4 targets, it also controls whether or not to emit a
835 string identifying the compiler. */
837 int flag_no_ident = 0;
839 /* This will perform a peephole pass before sched2. */
840 int flag_peephole2 = 0;
842 /* This will try to guess branch probabilities. */
843 int flag_guess_branch_prob = 0;
845 /* -fbounded-pointers causes gcc to compile pointers as composite
846 objects occupying three words: the pointer value, the base address
847 of the referent object, and the address immediately beyond the end
848 of the referent object. The base and extent allow us to perform
849 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
850 int flag_bounded_pointers = 0;
852 /* -fcheck-bounds causes gcc to generate array bounds checks.
853 For C, C++: defaults to value of flag_bounded_pointers.
854 For ObjC: defaults to off.
855 For Java: defaults to on.
856 For Fortran: defaults to off.
857 For CHILL: defaults to off. */
858 int flag_bounds_check = 0;
860 /* This will attempt to merge constant section constants, if 1 only
861 string constants and constants from constant pool, if 2 also constant
863 int flag_merge_constants = 1;
865 /* If one, renumber instruction UIDs to reduce the number of
866 unused UIDs if there are a lot of instructions. If greater than
867 one, unconditionally renumber instruction UIDs. */
868 int flag_renumber_insns = 1;
870 /* Values of the -falign-* flags: how much to align labels in code.
871 0 means `use default', 1 means `don't align'.
872 For each variable, there is an _log variant which is the power
873 of two not less than the variable, for .align output. */
877 int align_loops_max_skip;
880 int align_jumps_max_skip;
882 int align_labels_log;
883 int align_labels_max_skip;
885 int align_functions_log;
887 /* Table of supported debugging formats. */
890 const char *const arg;
891 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
892 constant expression, we use NO_DEBUG in its place. */
893 const enum debug_info_type debug_type;
894 const int use_extensions_p;
895 const char *const description;
899 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
900 N_("Generate debugging info in default format") },
901 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
902 #ifdef DBX_DEBUGGING_INFO
903 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
904 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
906 #ifdef DWARF_DEBUGGING_INFO
907 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
908 { "dwarf+", DWARF_DEBUG, 1,
909 N_("Generate extended DWARF-1 format debug info") },
911 #ifdef DWARF2_DEBUGGING_INFO
912 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
914 #ifdef XCOFF_DEBUGGING_INFO
915 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
916 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
918 #ifdef SDB_DEBUGGING_INFO
919 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
921 #ifdef VMS_DEBUGGING_INFO
922 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
929 const char *const string;
932 const char *const description;
934 lang_independent_options;
938 /* Add or remove a leading underscore from user symbols. */
939 int flag_leading_underscore = -1;
941 /* The user symbol prefix after having resolved same. */
942 const char *user_label_prefix;
944 static const param_info lang_independent_params[] = {
945 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
946 { OPTION, DEFAULT, HELP },
947 #include "params.def"
952 /* A default for same. */
953 #ifndef USER_LABEL_PREFIX
954 #define USER_LABEL_PREFIX ""
957 /* Table of language-independent -f options.
958 STRING is the option name. VARIABLE is the address of the variable.
959 ON_VALUE is the value to store in VARIABLE
960 if `-fSTRING' is seen as an option.
961 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
963 static const lang_independent_options f_options[] =
965 {"format-extensions", &flag_format_extensions, 1,
966 N_("-Wformat accepts certain FreeBSD system-dependent formats") },
967 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
968 N_("Perform DWARF2 duplicate elimination") },
969 {"float-store", &flag_float_store, 1,
970 N_("Do not store floats in registers") },
971 {"volatile", &flag_volatile, 1,
972 N_("Consider all mem refs through pointers as volatile") },
973 {"volatile-global", &flag_volatile_global, 1,
974 N_("Consider all mem refs to global data to be volatile") },
975 {"volatile-static", &flag_volatile_static, 1,
976 N_("Consider all mem refs to static data to be volatile") },
977 {"defer-pop", &flag_defer_pop, 1,
978 N_("Defer popping functions args from stack until later") },
979 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
980 N_("When possible do not generate stack frames") },
981 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
982 N_("Optimize sibling and tail recursive calls") },
983 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
984 N_("When running CSE, follow jumps to their targets") },
985 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
986 N_("When running CSE, follow conditional jumps") },
987 {"expensive-optimizations", &flag_expensive_optimizations, 1,
988 N_("Perform a number of minor, expensive optimizations") },
989 {"thread-jumps", &flag_thread_jumps, 1,
990 N_("Perform jump threading optimizations") },
991 {"strength-reduce", &flag_strength_reduce, 1,
992 N_("Perform strength reduction optimizations") },
993 {"unroll-loops", &flag_unroll_loops, 1,
994 N_("Perform loop unrolling when iteration count is known") },
995 {"unroll-all-loops", &flag_unroll_all_loops, 1,
996 N_("Perform loop unrolling for all loops") },
997 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
998 N_("Generate prefetch instructions, if available, for arrays in loops") },
999 {"move-all-movables", &flag_move_all_movables, 1,
1000 N_("Force all loop invariant computations out of loops") },
1001 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1002 N_("Strength reduce all loop general induction variables") },
1003 {"writable-strings", &flag_writable_strings, 1,
1004 N_("Store strings in writable data section") },
1005 {"peephole", &flag_no_peephole, 0,
1006 N_("Enable machine specific peephole optimizations") },
1007 {"force-mem", &flag_force_mem, 1,
1008 N_("Copy memory operands into registers before using") },
1009 {"force-addr", &flag_force_addr, 1,
1010 N_("Copy memory address constants into regs before using") },
1011 {"function-cse", &flag_no_function_cse, 0,
1012 N_("Allow function addresses to be held in registers") },
1013 {"inline-functions", &flag_inline_functions, 1,
1014 N_("Integrate simple functions into their callers") },
1015 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1016 N_("Generate code for funcs even if they are fully inlined") },
1017 {"inline", &flag_no_inline, 0,
1018 N_("Pay attention to the 'inline' keyword") },
1019 {"keep-static-consts", &flag_keep_static_consts, 1,
1020 N_("Emit static const variables even if they are not used") },
1021 {"syntax-only", &flag_syntax_only, 1,
1022 N_("Check for syntax errors, then stop") },
1023 {"shared-data", &flag_shared_data, 1,
1024 N_("Mark data as shared rather than private") },
1025 {"caller-saves", &flag_caller_saves, 1,
1026 N_("Enable saving registers around function calls") },
1027 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1028 N_("Return 'short' aggregates in memory, not registers") },
1029 {"reg-struct-return", &flag_pcc_struct_return, 0,
1030 N_("Return 'short' aggregates in registers") },
1031 {"delayed-branch", &flag_delayed_branch, 1,
1032 N_("Attempt to fill delay slots of branch instructions") },
1033 {"gcse", &flag_gcse, 1,
1034 N_("Perform the global common subexpression elimination") },
1035 {"gcse-lm", &flag_gcse_lm, 1,
1036 N_("Perform enhanced load motion during global subexpression elimination") },
1037 {"gcse-sm", &flag_gcse_sm, 1,
1038 N_("Perform store motion after global subexpression elimination") },
1039 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1040 N_("Run CSE pass after loop optimizations") },
1041 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1042 N_("Run the loop optimizer twice") },
1043 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1044 N_("Delete useless null pointer checks") },
1045 {"pretend-float", &flag_pretend_float, 1,
1046 N_("Pretend that host and target use the same FP format") },
1047 {"schedule-insns", &flag_schedule_insns, 1,
1048 N_("Reschedule instructions before register allocation") },
1049 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1050 N_("Reschedule instructions after register allocation") },
1051 {"sched-interblock",&flag_schedule_interblock, 1,
1052 N_("Enable scheduling across basic blocks") },
1053 {"sched-spec",&flag_schedule_speculative, 1,
1054 N_("Allow speculative motion of non-loads") },
1055 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1056 N_("Allow speculative motion of some loads") },
1057 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1058 N_("Allow speculative motion of more loads") },
1059 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1060 N_("Replace add,compare,branch with branch on count reg") },
1061 {"pic", &flag_pic, 1,
1062 N_("Generate position independent code, if possible") },
1063 {"PIC", &flag_pic, 2, ""},
1064 {"exceptions", &flag_exceptions, 1,
1065 N_("Enable exception handling") },
1066 {"unwind-tables", &flag_unwind_tables, 1,
1067 N_("Just generate unwind tables for exception handling") },
1068 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1069 N_("Generate unwind tables exact at each instruction boundary") },
1070 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1071 N_("Support synchronous non-call exceptions") },
1072 {"profile-arcs", &profile_arc_flag, 1,
1073 N_("Insert arc based program profiling code") },
1074 {"test-coverage", &flag_test_coverage, 1,
1075 N_("Create data files needed by gcov") },
1076 {"branch-probabilities", &flag_branch_probabilities, 1,
1077 N_("Use profiling information for branch probabilities") },
1078 {"reorder-blocks", &flag_reorder_blocks, 1,
1079 N_("Reorder basic blocks to improve code placement") },
1080 {"rename-registers", &flag_rename_registers, 1,
1081 N_("Do the register renaming optimization pass") },
1082 {"cprop-registers", &flag_cprop_registers, 1,
1083 N_("Do the register copy-propagation optimization pass") },
1084 {"common", &flag_no_common, 0,
1085 N_("Do not put uninitialized globals in the common section") },
1086 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1087 N_("Do not generate .size directives") },
1088 {"function-sections", &flag_function_sections, 1,
1089 N_("place each function into its own section") },
1090 {"data-sections", &flag_data_sections, 1,
1091 N_("place data items into their own section") },
1092 {"verbose-asm", &flag_verbose_asm, 1,
1093 N_("Add extra commentry to assembler output") },
1094 {"gnu-linker", &flag_gnu_linker, 1,
1095 N_("Output GNU ld formatted global initializers") },
1096 {"regmove", &flag_regmove, 1,
1097 N_("Enables a register move optimization") },
1098 {"optimize-register-move", &flag_regmove, 1,
1099 N_("Do the full regmove optimization pass") },
1100 {"pack-struct", &flag_pack_struct, 1,
1101 N_("Pack structure members together without holes") },
1102 {"stack-check", &flag_stack_check, 1,
1103 N_("Insert stack checking code into the program") },
1104 {"argument-alias", &flag_argument_noalias, 0,
1105 N_("Specify that arguments may alias each other & globals") },
1106 {"argument-noalias", &flag_argument_noalias, 1,
1107 N_("Assume arguments may alias globals but not each other") },
1108 {"argument-noalias-global", &flag_argument_noalias, 2,
1109 N_("Assume arguments do not alias each other or globals") },
1110 {"strict-aliasing", &flag_strict_aliasing, 1,
1111 N_("Assume strict aliasing rules apply") },
1112 {"align-loops", &align_loops, 0,
1113 N_("Align the start of loops") },
1114 {"align-jumps", &align_jumps, 0,
1115 N_("Align labels which are only reached by jumping") },
1116 {"align-labels", &align_labels, 0,
1117 N_("Align all labels") },
1118 {"align-functions", &align_functions, 0,
1119 N_("Align the start of functions") },
1120 {"merge-constants", &flag_merge_constants, 1,
1121 N_("Attempt to merge identical constants accross compilation units") },
1122 {"merge-all-constants", &flag_merge_constants, 2,
1123 N_("Attempt to merge identical constants and constant variables") },
1124 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1125 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1126 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1127 N_("Instrument function entry/exit with profiling calls") },
1128 {"ssa", &flag_ssa, 1,
1129 N_("Enable SSA optimizations") },
1130 {"ssa-ccp", &flag_ssa_ccp, 1,
1131 N_("Enable SSA conditional constant propagation") },
1132 {"ssa-dce", &flag_ssa_dce, 1,
1133 N_("Enable aggressive SSA dead code elimination") },
1134 {"leading-underscore", &flag_leading_underscore, 1,
1135 N_("External symbols have a leading underscore") },
1136 {"ident", &flag_no_ident, 0,
1137 N_("Process #ident directives") },
1138 { "peephole2", &flag_peephole2, 1,
1139 N_("Enables an rtl peephole pass run before sched2") },
1140 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1141 N_("Enables guessing of branch probabilities") },
1142 {"math-errno", &flag_errno_math, 1,
1143 N_("Set errno after built-in math functions") },
1144 {"trapping-math", &flag_trapping_math, 1,
1145 N_("Floating-point operations can trap") },
1146 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1147 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1148 {"bounded-pointers", &flag_bounded_pointers, 1,
1149 N_("Compile pointers as triples: value, base & end") },
1150 {"bounds-check", &flag_bounds_check, 1,
1151 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1152 {"single-precision-constant", &flag_single_precision_constant, 1,
1153 N_("Convert floating point constant to single precision constant") },
1154 {"time-report", &time_report, 1,
1155 N_("Report time taken by each compiler pass at end of run") },
1156 {"mem-report", &mem_report, 1,
1157 N_("Report on permanent memory allocation at end of run") },
1158 { "trapv", &flag_trapv, 1,
1159 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1162 /* Table of language-specific options. */
1164 static const struct lang_opt
1166 const char *const option;
1167 const char *const description;
1169 documented_lang_options[] =
1171 /* In order not to overload the --help output, the convention
1172 used here is to only describe those options which are not
1173 enabled by default. */
1176 N_("Compile just for ISO C89") },
1177 { "-fallow-single-precision",
1178 N_("Do not promote floats to double if using -traditional") },
1180 N_("Determine language standard") },
1182 { "-fsigned-bitfields", "" },
1183 { "-funsigned-bitfields",
1184 N_("Make bit-fields by unsigned by default") },
1185 { "-fno-signed-bitfields", "" },
1186 { "-fno-unsigned-bitfields","" },
1188 N_("Make 'char' be signed by default") },
1189 { "-funsigned-char",
1190 N_("Make 'char' be unsigned by default") },
1191 { "-fno-signed-char", "" },
1192 { "-fno-unsigned-char", "" },
1194 { "-ftraditional", "" },
1196 N_("Attempt to support traditional K&R style C") },
1197 { "-fnotraditional", "" },
1198 { "-fno-traditional", "" },
1202 N_("Do not recognize the 'asm' keyword") },
1203 { "-fbuiltin", "" },
1205 N_("Do not recognize any built in functions") },
1207 N_("Assume normal C execution environment") },
1208 { "-fno-hosted", "" },
1210 N_("Assume that standard libraries & main might not exist") },
1211 { "-fno-freestanding", "" },
1212 { "-fcond-mismatch",
1213 N_("Allow different types as args of ? operator") },
1214 { "-fno-cond-mismatch", "" },
1215 { "-fdollars-in-identifiers",
1216 N_("Allow the use of $ inside identifiers") },
1217 { "-fno-dollars-in-identifiers", "" },
1218 { "-fpreprocessed", "" },
1219 { "-fno-preprocessed", "" },
1221 N_("Use the same size for double as for float") },
1222 { "-fno-short-double", "" },
1224 N_("Use the smallest fitting integer to hold enums") },
1225 { "-fno-short-enums", "" },
1227 N_("Override the underlying type for wchar_t to `unsigned short'") },
1228 { "-fno-short-wchar", "" },
1231 N_("Enable most warning messages") },
1232 { "-Wbad-function-cast",
1233 N_("Warn about casting functions to incompatible types") },
1234 { "-Wno-bad-function-cast", "" },
1235 { "-Wno-missing-noreturn", "" },
1236 { "-Wmissing-format-attribute",
1237 N_("Warn about functions which might be candidates for format attributes") },
1238 { "-Wno-missing-format-attribute", "" },
1240 N_("Warn about casts which discard qualifiers") },
1241 { "-Wno-cast-qual", "" },
1242 { "-Wchar-subscripts",
1243 N_("Warn about subscripts whose type is 'char'") },
1244 { "-Wno-char-subscripts", "" },
1246 N_("Warn if nested comments are detected") },
1247 { "-Wno-comment", "" },
1249 N_("Warn if nested comments are detected") },
1250 { "-Wno-comments", "" },
1252 N_("Warn about possibly confusing type conversions") },
1253 { "-Wno-conversion", "" },
1255 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1256 { "-Wno-format", "" },
1257 { "-Wformat-y2k", "" },
1258 { "-Wno-format-y2k",
1259 N_("Don't warn about strftime formats yielding 2 digit years") },
1260 { "-Wformat-extra-args", "" },
1261 { "-Wno-format-extra-args",
1262 N_("Don't warn about too many arguments to format functions") },
1263 { "-Wformat-nonliteral",
1264 N_("Warn about non-string-literal format strings") },
1265 { "-Wno-format-nonliteral", "" },
1266 { "-Wformat-security",
1267 N_("Warn about possible security problems with format functions") },
1268 { "-Wno-format-security", "" },
1269 { "-Wimplicit-function-declaration",
1270 N_("Warn about implicit function declarations") },
1271 { "-Wno-implicit-function-declaration", "" },
1272 { "-Werror-implicit-function-declaration", "" },
1274 N_("Warn when a declaration does not specify a type") },
1275 { "-Wno-implicit-int", "" },
1276 { "-Wimplicit", "" },
1277 { "-Wno-implicit", "" },
1279 N_("Warn about the use of the #import directive") },
1280 { "-Wno-import", "" },
1281 { "-Wlong-long","" },
1283 N_("Do not warn about using 'long long' when -pedantic") },
1285 N_("Warn about suspicious declarations of main") },
1286 { "-Wno-main", "" },
1287 { "-Wmissing-braces",
1288 N_("Warn about possibly missing braces around initializers") },
1289 { "-Wno-missing-braces", "" },
1290 { "-Wmissing-declarations",
1291 N_("Warn about global funcs without previous declarations") },
1292 { "-Wno-missing-declarations", "" },
1293 { "-Wmissing-prototypes",
1294 N_("Warn about global funcs without prototypes") },
1295 { "-Wno-missing-prototypes", "" },
1297 N_("Warn about use of multicharacter literals") },
1298 { "-Wno-multichar", "" },
1299 { "-Wnested-externs",
1300 N_("Warn about externs not at file scope level") },
1301 { "-Wno-nested-externs", "" },
1303 N_("Warn about possible missing parentheses") },
1304 { "-Wno-parentheses", "" },
1305 { "-Wsequence-point",
1306 N_("Warn about possible violations of sequence point rules") },
1307 { "-Wno-sequence-point", "" },
1308 { "-Wpointer-arith",
1309 N_("Warn about function pointer arithmetic") },
1310 { "-Wno-pointer-arith", "" },
1311 { "-Wredundant-decls",
1312 N_("Warn about multiple declarations of the same object") },
1313 { "-Wno-redundant-decls", "" },
1315 N_("Warn about signed/unsigned comparisons") },
1316 { "-Wno-sign-compare", "" },
1318 N_("Warn about testing equality of floating point numbers") },
1319 { "-Wno-float-equal", "" },
1320 { "-Wunknown-pragmas",
1321 N_("Warn about unrecognized pragmas") },
1322 { "-Wno-unknown-pragmas", "" },
1323 { "-Wstrict-prototypes",
1324 N_("Warn about non-prototyped function decls") },
1325 { "-Wno-strict-prototypes", "" },
1327 N_("Warn about constructs whose meaning change in ISO C") },
1328 { "-Wno-traditional", "" },
1330 N_("Warn when trigraphs are encountered") },
1331 { "-Wno-trigraphs", "" },
1333 { "-Wno-undef", "" },
1334 { "-Wwrite-strings",
1335 N_("Mark strings as 'const char *'") },
1336 { "-Wno-write-strings", "" },
1338 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1340 #include "options.h"
1344 /* Here is a table, controlled by the tm.h file, listing each -m switch
1345 and which bits in `target_switches' it should set or clear.
1346 If VALUE is positive, it is bits to set.
1347 If VALUE is negative, -VALUE is bits to clear.
1348 (The sign bit is not used so there is no confusion.) */
1352 const char *const name;
1354 const char *const description;
1356 target_switches [] = TARGET_SWITCHES;
1358 /* This table is similar, but allows the switch to have a value. */
1360 #ifdef TARGET_OPTIONS
1363 const char *const prefix;
1364 const char **const variable;
1365 const char *const description;
1367 target_options [] = TARGET_OPTIONS;
1370 /* Options controlling warnings. */
1372 /* Don't print warning messages. -w. */
1374 int inhibit_warnings = 0;
1376 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1378 int warn_system_headers = 0;
1380 /* Print various extra warnings. -W. */
1382 int extra_warnings = 0;
1384 /* Treat warnings as errors. -Werror. */
1386 int warnings_are_errors = 0;
1388 /* Nonzero to warn about unused variables, functions et.al. */
1390 int warn_unused_function;
1391 int warn_unused_label;
1392 int warn_unused_parameter;
1393 int warn_unused_variable;
1394 int warn_unused_value;
1396 /* Nonzero to warn about code which is never reached. */
1398 int warn_notreached;
1400 /* Nonzero to warn about variables used before they are initialized. */
1402 int warn_uninitialized;
1404 /* Nonzero means warn about all declarations which shadow others. */
1408 /* Warn if a switch on an enum fails to have a case for every enum value. */
1412 /* Nonzero means warn about function definitions that default the return type
1413 or that use a null return and have a return-type other than void. */
1415 int warn_return_type;
1417 /* Nonzero means warn about pointer casts that increase the required
1418 alignment of the target type (and might therefore lead to a crash
1419 due to a misaligned access). */
1421 int warn_cast_align;
1423 /* Nonzero means warn about any objects definitions whose size is larger
1424 than N bytes. Also want about function definitions whose returned
1425 values are larger than N bytes. The value N is in `larger_than_size'. */
1427 int warn_larger_than;
1428 HOST_WIDE_INT larger_than_size;
1430 /* Nonzero means warn if inline function is too large. */
1434 /* Warn if a function returns an aggregate,
1435 since there are often incompatible calling conventions for doing this. */
1437 int warn_aggregate_return;
1439 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1443 /* Warn when gcc pads a structure to an alignment boundary. */
1447 /* Warn when an optimization pass is disabled. */
1449 int warn_disabled_optimization;
1451 /* Warn about functions which might be candidates for attribute noreturn. */
1453 int warn_missing_noreturn;
1455 /* Nonzero means warn about uses of __attribute__((deprecated))
1458 int warn_deprecated_decl = 1;
1460 /* Likewise for -W. */
1462 static const lang_independent_options W_options[] =
1464 {"unused-function", &warn_unused_function, 1,
1465 N_("Warn when a function is unused") },
1466 {"unused-label", &warn_unused_label, 1,
1467 N_("Warn when a label is unused") },
1468 {"unused-parameter", &warn_unused_parameter, 1,
1469 N_("Warn when a function parameter is unused") },
1470 {"unused-variable", &warn_unused_variable, 1,
1471 N_("Warn when a variable is unused") },
1472 {"unused-value", &warn_unused_value, 1,
1473 N_("Warn when an expression value is unused") },
1474 {"system-headers", &warn_system_headers, 1,
1475 N_("Do not suppress warnings from system headers") },
1476 {"error", &warnings_are_errors, 1,
1477 N_("Treat all warnings as errors") },
1478 {"shadow", &warn_shadow, 1,
1479 N_("Warn when one local variable shadows another") },
1480 {"switch", &warn_switch, 1,
1481 N_("Warn about enumerated switches missing a specific case") },
1482 {"aggregate-return", &warn_aggregate_return, 1,
1483 N_("Warn about returning structures, unions or arrays") },
1484 {"cast-align", &warn_cast_align, 1,
1485 N_("Warn about pointer casts which increase alignment") },
1486 {"unreachable-code", &warn_notreached, 1,
1487 N_("Warn about code that will never be executed") },
1488 {"uninitialized", &warn_uninitialized, 1,
1489 N_("Warn about uninitialized automatic variables") },
1490 {"inline", &warn_inline, 1,
1491 N_("Warn when an inlined function cannot be inlined") },
1492 {"packed", &warn_packed, 1,
1493 N_("Warn when the packed attribute has no effect on struct layout") },
1494 {"padded", &warn_padded, 1,
1495 N_("Warn when padding is required to align struct members") },
1496 {"disabled-optimization", &warn_disabled_optimization, 1,
1497 N_("Warn when an optimization pass is disabled") },
1498 {"deprecated-declarations", &warn_deprecated_decl, 1,
1499 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1500 {"missing-noreturn", &warn_missing_noreturn, 1,
1501 N_("Warn about functions which might be candidates for attribute noreturn") }
1505 set_Wunused (setting)
1508 warn_unused_function = setting;
1509 warn_unused_label = setting;
1510 /* Unused function parameter warnings are reported when either ``-W
1511 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1512 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1514 warn_unused_parameter = 0;
1515 else if (!warn_unused_parameter)
1516 warn_unused_parameter = -1;
1517 warn_unused_variable = setting;
1518 warn_unused_value = setting;
1521 /* The following routines are useful in setting all the flags that
1522 -ffast-math and -fno-fast-math imply. */
1525 set_fast_math_flags ()
1527 flag_trapping_math = 0;
1528 flag_unsafe_math_optimizations = 1;
1529 flag_errno_math = 0;
1533 set_no_fast_math_flags ()
1535 flag_trapping_math = 1;
1536 flag_unsafe_math_optimizations = 0;
1537 flag_errno_math = 1;
1541 /* Output files for assembler code (real compiler output)
1542 and debugging dumps. */
1545 FILE *aux_info_file;
1546 FILE *rtl_dump_file = NULL;
1548 /* Decode the string P as an integral parameter.
1549 If the string is indeed an integer return its numeric value else
1550 issue an Invalid Option error for the option PNAME and return DEFVAL.
1551 If PNAME is zero just return DEFVAL, do not call error. */
1554 read_integral_parameter (p, pname, defval)
1559 const char *endp = p;
1563 if (ISDIGIT (*endp))
1572 error ("invalid option `%s'", pname);
1580 /* This is the default decl_printable_name function. */
1583 decl_name (decl, verbosity)
1585 int verbosity ATTRIBUTE_UNUSED;
1587 return IDENTIFIER_POINTER (DECL_NAME (decl));
1591 /* This calls abort and is used to avoid problems when abort if a macro.
1592 It is used when we need to pass the address of abort. */
1600 /* When `malloc.c' is compiled with `rcheck' defined,
1601 it calls this function to report clobberage. */
1605 const char *s ATTRIBUTE_UNUSED;
1610 /* Return the logarithm of X, base 2, considering X unsigned,
1611 if X is a power of 2. Otherwise, returns -1.
1613 This should be used via the `exact_log2' macro. */
1617 unsigned HOST_WIDE_INT x;
1620 /* Test for 0 or a power of 2. */
1621 if (x == 0 || x != (x & -x))
1623 while ((x >>= 1) != 0)
1628 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1629 If X is 0, return -1.
1631 This should be used via the floor_log2 macro. */
1635 unsigned HOST_WIDE_INT x;
1644 static int float_handler_set;
1646 jmp_buf float_handler;
1648 /* Signals actually come here. */
1651 float_signal (signo)
1652 /* If this is missing, some compilers complain. */
1653 int signo ATTRIBUTE_UNUSED;
1655 if (float_handled == 0)
1656 crash_signal (signo);
1659 /* On System-V derived systems, we must reinstall the signal handler.
1660 This is harmless on BSD-derived systems. */
1661 signal (SIGFPE, float_signal);
1662 longjmp (float_handler, 1);
1665 /* Specify where to longjmp to when a floating arithmetic error happens.
1666 If HANDLER is 0, it means don't handle the errors any more. */
1669 set_float_handler (handler)
1672 float_handled = (handler != 0);
1674 memcpy (float_handler, handler, sizeof (float_handler));
1676 if (float_handled && ! float_handler_set)
1678 signal (SIGFPE, float_signal);
1679 float_handler_set = 1;
1683 /* This is a wrapper function for code which might elicit an
1684 arithmetic exception. That code should be passed in as a function
1685 pointer FN, and one argument DATA. DATA is usually a struct which
1686 contains the real input and output for function FN. This function
1687 returns 0 (failure) if longjmp was called (i.e. an exception
1688 occurred.) It returns 1 (success) otherwise. */
1691 do_float_handler (fn, data)
1692 void (*fn) PARAMS ((PTR));
1699 /* We got here via longjmp () caused by an exception in function
1701 set_float_handler (NULL);
1705 set_float_handler (buf);
1707 set_float_handler (NULL);
1711 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1712 into ICE messages, which is much more user friendly. */
1715 crash_signal (signo)
1718 internal_error ("internal error: %s", strsignal (signo));
1721 /* Strip off a legitimate source ending from the input string NAME of
1722 length LEN. Rather than having to know the names used by all of
1723 our front ends, we strip off an ending of a period followed by
1724 up to five characters. (Java uses ".class".) */
1727 strip_off_ending (name, len)
1732 for (i = 2; i < 6 && len > i; i++)
1734 if (name[len - i] == '.')
1736 name[len - i] = '\0';
1742 /* Output a quoted string. */
1745 output_quoted_string (asm_file, string)
1749 #ifdef OUTPUT_QUOTED_STRING
1750 OUTPUT_QUOTED_STRING (asm_file, string);
1754 putc ('\"', asm_file);
1755 while ((c = *string++) != 0)
1759 if (c == '\"' || c == '\\')
1760 putc ('\\', asm_file);
1764 fprintf (asm_file, "\\%03o", c);
1766 putc ('\"', asm_file);
1770 /* Output a file name in the form wanted by System V. */
1773 output_file_directive (asm_file, input_name)
1775 const char *input_name;
1777 int len = strlen (input_name);
1778 const char *na = input_name + len;
1780 /* NA gets INPUT_NAME sans directory names. */
1781 while (na > input_name)
1783 if (IS_DIR_SEPARATOR (na[-1]))
1788 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1789 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1791 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1792 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1794 fprintf (asm_file, "\t.file\t");
1795 output_quoted_string (asm_file, na);
1796 fputc ('\n', asm_file);
1801 /* Routine to open a dump file. Return true if the dump file is enabled. */
1804 open_dump_file (index, decl)
1805 enum dump_file_index index;
1809 const char *open_arg;
1812 if (! dump_file[index].enabled)
1815 timevar_push (TV_DUMP);
1816 if (rtl_dump_file != NULL)
1817 fclose (rtl_dump_file);
1819 sprintf (seq, DUMPFILE_FORMAT, index);
1821 if (! dump_file[index].initialized)
1823 /* If we've not initialized the files, do so now. */
1824 if (graph_dump_format != no_graph
1825 && dump_file[index].graph_dump_p)
1827 dump_name = concat (seq, dump_file[index].extension, NULL);
1828 clean_graph_dump_file (dump_base_name, dump_name);
1831 dump_file[index].initialized = 1;
1837 dump_name = concat (dump_base_name, seq,
1838 dump_file[index].extension, NULL);
1840 rtl_dump_file = fopen (dump_name, open_arg);
1841 if (rtl_dump_file == NULL)
1842 fatal_io_error ("can't open %s", dump_name);
1847 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1848 decl_printable_name (decl, 2));
1850 timevar_pop (TV_DUMP);
1854 /* Routine to close a dump file. */
1857 close_dump_file (index, func, insns)
1858 enum dump_file_index index;
1859 void (*func) PARAMS ((FILE *, rtx));
1862 if (! rtl_dump_file)
1865 timevar_push (TV_DUMP);
1867 && graph_dump_format != no_graph
1868 && dump_file[index].graph_dump_p)
1873 sprintf (seq, DUMPFILE_FORMAT, index);
1874 suffix = concat (seq, dump_file[index].extension, NULL);
1875 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1880 func (rtl_dump_file, insns);
1882 fflush (rtl_dump_file);
1883 fclose (rtl_dump_file);
1885 rtl_dump_file = NULL;
1886 timevar_pop (TV_DUMP);
1889 /* Do any final processing required for the declarations in VEC, of
1890 which there are LEN. We write out inline functions and variables
1891 that have been deferred until this point, but which are required.
1892 Returns non-zero if anything was put out. */
1895 wrapup_global_declarations (vec, len)
1902 int output_something = 0;
1904 for (i = 0; i < len; i++)
1908 /* We're not deferring this any longer. */
1909 DECL_DEFER_OUTPUT (decl) = 0;
1911 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1912 && incomplete_decl_finalize_hook != 0)
1913 (*incomplete_decl_finalize_hook) (decl);
1916 /* Now emit any global variables or functions that we have been
1917 putting off. We need to loop in case one of the things emitted
1918 here references another one which comes earlier in the list. */
1922 for (i = 0; i < len; i++)
1926 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1929 /* Don't write out static consts, unless we still need them.
1931 We also keep static consts if not optimizing (for debugging),
1932 unless the user specified -fno-keep-static-consts.
1933 ??? They might be better written into the debug information.
1934 This is possible when using DWARF.
1936 A language processor that wants static constants to be always
1937 written out (even if it is not used) is responsible for
1938 calling rest_of_decl_compilation itself. E.g. the C front-end
1939 calls rest_of_decl_compilation from finish_decl.
1940 One motivation for this is that is conventional in some
1941 environments to write things like:
1942 static const char rcsid[] = "... version string ...";
1943 intending to force the string to be in the executable.
1945 A language processor that would prefer to have unneeded
1946 static constants "optimized away" would just defer writing
1947 them out until here. E.g. C++ does this, because static
1948 constants are often defined in header files.
1950 ??? A tempting alternative (for both C and C++) would be
1951 to force a constant to be written if and only if it is
1952 defined in a main file, as opposed to an include file. */
1954 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1958 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1960 else if (DECL_COMDAT (decl))
1962 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1963 && (optimize || !flag_keep_static_consts
1964 || DECL_ARTIFICIAL (decl)))
1970 rest_of_decl_compilation (decl, NULL, 1, 1);
1974 if (TREE_CODE (decl) == FUNCTION_DECL
1975 && DECL_INITIAL (decl) != 0
1976 && DECL_SAVED_INSNS (decl) != 0
1977 && (flag_keep_inline_functions
1978 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1982 output_inline_function (decl);
1987 output_something = 1;
1991 return output_something;
1994 /* Issue appropriate warnings for the global declarations in VEC (of
1995 which there are LEN). Output debugging information for them. */
1998 check_global_declarations (vec, len)
2005 for (i = 0; i < len; i++)
2009 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2010 && ! TREE_ASM_WRITTEN (decl))
2011 /* Cancel the RTL for this decl so that, if debugging info
2012 output for global variables is still to come,
2013 this one will be omitted. */
2014 SET_DECL_RTL (decl, NULL_RTX);
2016 /* Warn about any function
2017 declared static but not defined.
2018 We don't warn about variables,
2019 because many programs have static variables
2020 that exist only to get some text into the object file. */
2021 if (TREE_CODE (decl) == FUNCTION_DECL
2022 && (warn_unused_function
2023 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2024 && DECL_INITIAL (decl) == 0
2025 && DECL_EXTERNAL (decl)
2026 && ! DECL_ARTIFICIAL (decl)
2027 && ! TREE_PUBLIC (decl))
2029 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2030 pedwarn_with_decl (decl,
2031 "`%s' used but never defined");
2033 warning_with_decl (decl,
2034 "`%s' declared `static' but never defined");
2035 /* This symbol is effectively an "extern" declaration now. */
2036 TREE_PUBLIC (decl) = 1;
2037 assemble_external (decl);
2040 /* Warn about static fns or vars defined but not used,
2041 but not about inline functions or static consts
2042 since defining those in header files is normal practice. */
2043 if (((warn_unused_function
2044 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2045 || (warn_unused_variable
2046 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2047 && ! DECL_IN_SYSTEM_HEADER (decl)
2048 && ! DECL_EXTERNAL (decl)
2049 && ! TREE_PUBLIC (decl)
2050 && ! TREE_USED (decl)
2051 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2052 /* The TREE_USED bit for file-scope decls
2053 is kept in the identifier, to handle multiple
2054 external decls in different scopes. */
2055 && ! TREE_USED (DECL_NAME (decl)))
2056 warning_with_decl (decl, "`%s' defined but not used");
2058 timevar_push (TV_SYMOUT);
2059 (*debug_hooks->global_decl) (decl);
2060 timevar_pop (TV_SYMOUT);
2064 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2065 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2066 INPUT_FILENAME and LINENO accordingly. */
2069 push_srcloc (file, line)
2073 struct file_stack *fs;
2075 if (input_file_stack)
2077 input_file_stack->name = input_filename;
2078 input_file_stack->line = lineno;
2081 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2082 fs->name = input_filename = file;
2083 fs->line = lineno = line;
2084 fs->indent_level = 0;
2085 fs->next = input_file_stack;
2086 input_file_stack = fs;
2087 input_file_stack_tick++;
2090 /* Pop the top entry off the stack of presently open source files.
2091 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2097 struct file_stack *fs;
2099 fs = input_file_stack;
2100 input_file_stack = fs->next;
2102 input_file_stack_tick++;
2103 /* The initial source file is never popped. */
2104 if (!input_file_stack)
2106 input_filename = input_file_stack->name;
2107 lineno = input_file_stack->line;
2110 /* Compile an entire translation unit. Write a file of assembly
2111 output and various debugging dumps. */
2118 /* Initialize yet another pass. */
2120 init_final (main_input_filename);
2121 init_branch_prob (dump_base_name);
2123 timevar_push (TV_PARSE);
2125 /* Call the parser, which parses the entire file
2126 (calling rest_of_compilation for each function). */
2129 /* In case there were missing block closers,
2130 get us back to the global binding level. */
2131 (*lang_hooks.clear_binding_stack) ();
2133 /* Compilation is now finished except for writing
2134 what's left of the symbol table output. */
2136 timevar_pop (TV_PARSE);
2138 if (flag_syntax_only)
2141 globals = getdecls ();
2143 /* Really define vars that have had only a tentative definition.
2144 Really output inline functions that must actually be callable
2145 and have not been output so far. */
2148 int len = list_length (globals);
2149 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2153 /* Process the decls in reverse order--earliest first.
2154 Put them into VEC from back to front, then take out from front. */
2156 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2157 vec[len - i - 1] = decl;
2159 wrapup_global_declarations (vec, len);
2161 /* This must occur after the loop to output deferred functions. Else
2162 the profiler initializer would not be emitted if all the functions
2163 in this compilation unit were deferred.
2165 output_func_start_profiler can not cause any additional functions or
2166 data to need to be output, so it need not be in the deferred function
2168 output_func_start_profiler ();
2170 check_global_declarations (vec, len);
2176 /* Write out any pending weak symbol declarations. */
2180 /* Do dbx symbols. */
2181 timevar_push (TV_SYMOUT);
2183 #ifdef DWARF2_UNWIND_INFO
2184 if (dwarf2out_do_frame ())
2185 dwarf2out_frame_finish ();
2188 (*debug_hooks->finish) (main_input_filename);
2189 timevar_pop (TV_SYMOUT);
2191 /* Output some stuff at end of file if nec. */
2193 dw2_output_indirect_constants ();
2195 end_final (dump_base_name);
2197 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2199 timevar_push (TV_DUMP);
2200 open_dump_file (DFI_bp, NULL);
2204 close_dump_file (DFI_bp, NULL, NULL_RTX);
2205 timevar_pop (TV_DUMP);
2209 ASM_FILE_END (asm_out_file);
2212 /* Attach a special .ident directive to the end of the file to identify
2213 the version of GCC which compiled this code. The format of the .ident
2214 string is patterned after the ones produced by native SVR4 compilers. */
2217 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2218 IDENT_ASM_OP, version_string);
2221 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2223 timevar_push (TV_DUMP);
2224 dump_combine_total_stats (rtl_dump_file);
2225 close_dump_file (DFI_combine, NULL, NULL_RTX);
2226 timevar_pop (TV_DUMP);
2230 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2231 and TYPE_DECL nodes.
2233 This does nothing for local (non-static) variables, unless the
2234 variable is a register variable with an ASMSPEC. In that case, or
2235 if the variable is not an automatic, it sets up the RTL and
2236 outputs any assembler code (label definition, storage allocation
2237 and initialization).
2239 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2240 the assembler symbol name to be used. TOP_LEVEL is nonzero
2241 if this declaration is not within a function. */
2244 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2246 const char *asmspec;
2250 /* Declarations of variables, and of functions defined elsewhere. */
2252 /* The most obvious approach, to put an #ifndef around where
2253 this macro is used, doesn't work since it's inside a macro call. */
2254 #ifndef ASM_FINISH_DECLARE_OBJECT
2255 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2258 /* We deferred calling assemble_alias so that we could collect
2259 other attributes such as visibility. Emit the alias now. */
2262 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2265 alias = TREE_VALUE (TREE_VALUE (alias));
2266 alias = get_identifier (TREE_STRING_POINTER (alias));
2267 assemble_alias (decl, alias);
2271 /* Forward declarations for nested functions are not "external",
2272 but we need to treat them as if they were. */
2273 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2274 || TREE_CODE (decl) == FUNCTION_DECL)
2276 timevar_push (TV_VARCONST);
2278 make_decl_rtl (decl, asmspec);
2279 /* Don't output anything
2280 when a tentative file-scope definition is seen.
2281 But at end of compilation, do output code for them. */
2282 if (at_end || !DECL_DEFER_OUTPUT (decl))
2283 assemble_variable (decl, top_level, at_end, 0);
2284 if (decl == last_assemble_variable_decl)
2286 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2289 timevar_pop (TV_VARCONST);
2291 else if (DECL_REGISTER (decl) && asmspec != 0)
2293 if (decode_reg_name (asmspec) >= 0)
2295 SET_DECL_RTL (decl, NULL_RTX);
2296 make_decl_rtl (decl, asmspec);
2300 error ("invalid register name `%s' for register variable", asmspec);
2301 DECL_REGISTER (decl) = 0;
2306 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2307 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2308 && TREE_CODE (decl) == TYPE_DECL)
2310 timevar_push (TV_SYMOUT);
2311 dbxout_symbol (decl, 0);
2312 timevar_pop (TV_SYMOUT);
2315 #ifdef SDB_DEBUGGING_INFO
2316 else if (write_symbols == SDB_DEBUG && top_level
2317 && TREE_CODE (decl) == TYPE_DECL)
2319 timevar_push (TV_SYMOUT);
2320 sdbout_symbol (decl, 0);
2321 timevar_pop (TV_SYMOUT);
2326 /* Called after finishing a record, union or enumeral type. */
2329 rest_of_type_compilation (type, toplev)
2330 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2334 tree type ATTRIBUTE_UNUSED;
2335 int toplev ATTRIBUTE_UNUSED;
2338 timevar_push (TV_SYMOUT);
2339 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2340 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2341 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2343 #ifdef SDB_DEBUGGING_INFO
2344 if (write_symbols == SDB_DEBUG)
2345 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2347 #ifdef DWARF2_DEBUGGING_INFO
2348 if ((write_symbols == DWARF2_DEBUG
2349 || write_symbols == VMS_AND_DWARF2_DEBUG)
2351 dwarf2out_decl (TYPE_STUB_DECL (type));
2353 timevar_pop (TV_SYMOUT);
2356 /* This is called from finish_function (within yyparse)
2357 after each top-level definition is parsed.
2358 It is supposed to compile that function or variable
2359 and output the assembler code for it.
2360 After we return, the tree storage is freed. */
2363 rest_of_compilation (decl)
2369 int rebuild_label_notes_after_reload;
2370 int register_life_up_to_date;
2371 int cleanup_crossjump;
2373 timevar_push (TV_REST_OF_COMPILATION);
2375 /* Now that we're out of the frontend, we shouldn't have any more
2376 CONCATs anywhere. */
2377 generating_concat_p = 0;
2379 /* When processing delayed functions, prepare_function_start() won't
2380 have been run to re-initialize it. */
2381 cse_not_expected = ! optimize;
2383 /* First, make sure that NOTE_BLOCK is set correctly for each
2384 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2385 if (!cfun->x_whole_function_mode_p)
2388 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2389 tree in sensible shape. So, we just recalculate it here. */
2390 if (cfun->x_whole_function_mode_p)
2395 /* If we are reconsidering an inline function
2396 at the end of compilation, skip the stuff for making it inline. */
2398 if (DECL_SAVED_INSNS (decl) == 0)
2404 /* If this is nested inside an inlined external function, pretend
2405 it was only declared. Since we cannot inline such functions,
2406 generating code for this one is not only not necessary but will
2407 confuse some debugging output writers. */
2408 for (parent = DECL_CONTEXT (current_function_decl);
2409 parent != NULL_TREE;
2410 parent = get_containing_scope (parent))
2411 if (TREE_CODE (parent) == FUNCTION_DECL
2412 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2414 DECL_INITIAL (decl) = 0;
2415 goto exit_rest_of_compilation;
2418 /* If requested, consider whether to make this function inline. */
2419 if ((DECL_INLINE (decl) && !flag_no_inline)
2420 || flag_inline_functions)
2422 timevar_push (TV_INTEGRATION);
2423 lose = function_cannot_inline_p (decl);
2424 timevar_pop (TV_INTEGRATION);
2425 if (lose || ! optimize)
2427 if (warn_inline && DECL_INLINE (decl))
2428 warning_with_decl (decl, lose);
2429 DECL_ABSTRACT_ORIGIN (decl) = 0;
2430 /* Don't really compile an extern inline function.
2431 If we can't make it inline, pretend
2432 it was only declared. */
2433 if (DECL_EXTERNAL (decl))
2435 DECL_INITIAL (decl) = 0;
2436 goto exit_rest_of_compilation;
2440 /* ??? Note that this has the effect of making it look
2441 like "inline" was specified for a function if we choose
2442 to inline it. This isn't quite right, but it's
2443 probably not worth the trouble to fix. */
2444 inlinable = DECL_INLINE (decl) = 1;
2447 insns = get_insns ();
2449 /* Dump the rtl code if we are dumping rtl. */
2451 if (open_dump_file (DFI_rtl, decl))
2453 if (DECL_SAVED_INSNS (decl))
2454 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2455 close_dump_file (DFI_rtl, print_rtl, insns);
2458 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2459 sorts of eh initialization. Delay this until after the
2460 initial rtl dump so that we can see the original nesting. */
2461 convert_from_eh_region_ranges ();
2463 /* If function is inline, and we don't yet know whether to
2464 compile it by itself, defer decision till end of compilation.
2465 finish_compilation will call rest_of_compilation again
2466 for those functions that need to be output. Also defer those
2467 functions that we are supposed to defer. */
2470 || (DECL_INLINE (decl)
2471 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2472 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2473 && ! flag_keep_inline_functions)
2474 || DECL_EXTERNAL (decl))))
2475 DECL_DEFER_OUTPUT (decl) = 1;
2477 if (DECL_INLINE (decl))
2478 /* DWARF wants separate debugging info for abstract and
2479 concrete instances of all inline functions, including those
2480 declared inline but not inlined, and those inlined even
2481 though they weren't declared inline. Conveniently, that's
2482 what DECL_INLINE means at this point. */
2483 (*debug_hooks->deferred_inline_function) (decl);
2485 if (DECL_DEFER_OUTPUT (decl))
2487 /* If -Wreturn-type, we have to do a bit of compilation. We just
2488 want to call cleanup the cfg to figure out whether or not we can
2489 fall off the end of the function; we do the minimum amount of
2490 work necessary to make that safe. */
2491 if (warn_return_type)
2493 int saved_optimize = optimize;
2496 rebuild_jump_labels (insns);
2497 find_exception_handler_labels ();
2498 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2499 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2500 optimize = saved_optimize;
2502 /* CFG is no longer maintained up-to-date. */
2503 free_bb_for_insn ();
2506 current_function_nothrow = nothrow_function_p ();
2507 if (current_function_nothrow)
2508 /* Now we know that this can't throw; set the flag for the benefit
2509 of other functions later in this translation unit. */
2510 TREE_NOTHROW (current_function_decl) = 1;
2512 timevar_push (TV_INTEGRATION);
2513 save_for_inline (decl);
2514 timevar_pop (TV_INTEGRATION);
2515 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2516 goto exit_rest_of_compilation;
2519 /* If specified extern inline but we aren't inlining it, we are
2520 done. This goes for anything that gets here with DECL_EXTERNAL
2521 set, not just things with DECL_INLINE. */
2522 if (DECL_EXTERNAL (decl))
2523 goto exit_rest_of_compilation;
2526 /* If we're emitting a nested function, make sure its parent gets
2527 emitted as well. Doing otherwise confuses debug info. */
2530 for (parent = DECL_CONTEXT (current_function_decl);
2531 parent != NULL_TREE;
2532 parent = get_containing_scope (parent))
2533 if (TREE_CODE (parent) == FUNCTION_DECL)
2534 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2537 /* We are now committed to emitting code for this function. Do any
2538 preparation, such as emitting abstract debug info for the inline
2539 before it gets mangled by optimization. */
2540 if (DECL_INLINE (decl))
2541 (*debug_hooks->outlining_inline_function) (decl);
2543 /* Remove any notes we don't need. That will make iterating
2544 over the instruction sequence faster, and allow the garbage
2545 collector to reclaim the memory used by the notes. */
2546 remove_unnecessary_notes ();
2551 /* Initialize some variables used by the optimizers. */
2552 init_function_for_compilation ();
2554 if (! DECL_DEFER_OUTPUT (decl))
2555 TREE_ASM_WRITTEN (decl) = 1;
2557 /* Now that integrate will no longer see our rtl, we need not
2558 distinguish between the return value of this function and the
2559 return value of called functions. Also, we can remove all SETs
2560 of subregs of hard registers; they are only here because of
2561 integrate. Also, we can now initialize pseudos intended to
2562 carry magic hard reg data throughout the function. */
2563 rtx_equal_function_value_matters = 0;
2564 purge_hard_subreg_sets (get_insns ());
2566 /* Early return if there were errors. We can run afoul of our
2567 consistency checks, and there's not really much point in fixing them.
2568 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2569 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2570 || errorcount || sorrycount)
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);
2599 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2600 generation, which might create new sets. */
2601 emit_initial_value_sets ();
2604 /* If we are doing position-independent code generation, now
2605 is the time to output special prologues and epilogues.
2606 We do not want to do this earlier, because it just clutters
2607 up inline functions with meaningless insns. */
2612 insns = get_insns ();
2614 /* Copy any shared structure that should not be shared. */
2615 unshare_all_rtl (current_function_decl, insns);
2617 #ifdef SETJMP_VIA_SAVE_AREA
2618 /* This must be performed before virtual register instantiation. */
2619 if (current_function_calls_alloca)
2620 optimize_save_area_alloca (insns);
2623 /* Instantiate all virtual registers. */
2624 instantiate_virtual_regs (current_function_decl, insns);
2626 open_dump_file (DFI_jump, decl);
2628 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2629 are initialized and to compute whether control can drop off the end
2632 timevar_push (TV_JUMP);
2633 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2634 before jump optimization switches branch directions. */
2635 expected_value_to_br_prob ();
2637 reg_scan (insns, max_reg_num (), 0);
2638 rebuild_jump_labels (insns);
2639 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2640 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP);
2642 /* CFG is no longer maintained up-to-date. */
2643 free_bb_for_insn ();
2644 copy_loop_headers (insns);
2645 purge_line_number_notes (insns);
2647 timevar_pop (TV_JUMP);
2649 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2650 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2652 close_dump_file (DFI_jump, print_rtl, insns);
2653 goto exit_rest_of_compilation;
2656 /* Long term, this should probably move before the jump optimizer too,
2657 but I didn't want to disturb the rtl_dump_and_exit and related
2658 stuff at this time. */
2659 if (optimize > 0 && flag_ssa)
2661 /* Convert to SSA form. */
2663 timevar_push (TV_TO_SSA);
2664 open_dump_file (DFI_ssa, decl);
2666 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2667 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2670 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2671 timevar_pop (TV_TO_SSA);
2673 /* Perform sparse conditional constant propagation, if requested. */
2676 timevar_push (TV_SSA_CCP);
2677 open_dump_file (DFI_ssa_ccp, decl);
2681 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2682 timevar_pop (TV_SSA_CCP);
2685 /* It would be useful to cleanup the CFG at this point, but block
2686 merging and possibly other transformations might leave a PHI
2687 node in the middle of a basic block, which is a strict no-no. */
2689 /* The SSA implementation uses basic block numbers in its phi
2690 nodes. Thus, changing the control-flow graph or the basic
2691 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2692 may cause problems. */
2696 /* Remove dead code. */
2698 timevar_push (TV_SSA_DCE);
2699 open_dump_file (DFI_ssa_dce, decl);
2701 insns = get_insns ();
2702 ssa_eliminate_dead_code();
2704 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2705 timevar_pop (TV_SSA_DCE);
2708 /* Convert from SSA form. */
2710 timevar_push (TV_FROM_SSA);
2711 open_dump_file (DFI_ussa, decl);
2713 convert_from_ssa ();
2714 /* New registers have been created. Rescan their usage. */
2715 reg_scan (insns, max_reg_num (), 1);
2717 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2718 timevar_pop (TV_FROM_SSA);
2721 /* CFG is no longer maintained up-to-date. */
2722 free_bb_for_insn ();
2725 timevar_push (TV_JUMP);
2729 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2730 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2731 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2733 /* ??? Run if-conversion before delete_null_pointer_checks,
2734 since the later does not preserve the CFG. This should
2735 be changed -- no since converting if's that are going to
2737 timevar_push (TV_IFCVT);
2739 timevar_pop (TV_IFCVT);
2741 /* CFG is no longer maintained up-to-date. */
2742 free_bb_for_insn ();
2743 /* Try to identify useless null pointer tests and delete them. */
2744 if (flag_delete_null_pointer_checks)
2745 delete_null_pointer_checks (insns);
2748 /* Jump optimization, and the removal of NULL pointer checks, may
2749 have reduced the number of instructions substantially. CSE, and
2750 future passes, allocate arrays whose dimensions involve the
2751 maximum instruction UID, so if we can reduce the maximum UID
2752 we'll save big on memory. */
2753 renumber_insns (rtl_dump_file);
2754 timevar_pop (TV_JUMP);
2756 close_dump_file (DFI_jump, print_rtl, insns);
2760 /* Perform common subexpression elimination.
2761 Nonzero value from `cse_main' means that jumps were simplified
2762 and some code may now be unreachable, so do
2763 jump optimization again. */
2767 open_dump_file (DFI_cse, decl);
2768 timevar_push (TV_CSE);
2770 reg_scan (insns, max_reg_num (), 1);
2772 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2774 /* If we are not running more CSE passes, then we are no longer
2775 expecting CSE to be run. But always rerun it in a cheap mode. */
2776 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2778 if (tem || optimize > 1)
2780 timevar_push (TV_JUMP);
2781 rebuild_jump_labels (insns);
2782 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2783 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2784 timevar_pop (TV_JUMP);
2785 /* CFG is no longer maintained up-to-date. */
2786 free_bb_for_insn ();
2789 /* Run this after jump optmizations remove all the unreachable code
2790 so that unreachable code will not keep values live. */
2791 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2793 /* Try to identify useless null pointer tests and delete them. */
2794 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2796 timevar_push (TV_JUMP);
2797 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2799 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2800 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2802 if (flag_delete_null_pointer_checks)
2803 delete_null_pointer_checks (insns);
2804 /* CFG is no longer maintained up-to-date. */
2805 free_bb_for_insn ();
2806 timevar_pop (TV_JUMP);
2809 /* The second pass of jump optimization is likely to have
2810 removed a bunch more instructions. */
2811 renumber_insns (rtl_dump_file);
2813 timevar_pop (TV_CSE);
2814 close_dump_file (DFI_cse, print_rtl, insns);
2817 open_dump_file (DFI_addressof, decl);
2819 purge_addressof (insns);
2820 reg_scan (insns, max_reg_num (), 1);
2822 close_dump_file (DFI_addressof, print_rtl, insns);
2826 /* Perform global cse. */
2828 if (optimize > 0 && flag_gcse)
2830 int save_csb, save_cfj;
2833 timevar_push (TV_GCSE);
2834 open_dump_file (DFI_gcse, decl);
2836 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2837 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2838 tem = gcse_main (insns, rtl_dump_file);
2839 rebuild_jump_labels (insns);
2841 save_csb = flag_cse_skip_blocks;
2842 save_cfj = flag_cse_follow_jumps;
2843 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2845 /* CFG is no longer maintained up-to-date. */
2846 free_bb_for_insn ();
2847 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2849 if (flag_expensive_optimizations)
2851 timevar_push (TV_CSE);
2852 reg_scan (insns, max_reg_num (), 1);
2853 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2854 timevar_pop (TV_CSE);
2855 cse_not_expected = !flag_rerun_cse_after_loop;
2858 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2859 things up. Then possibly re-run CSE again. */
2863 timevar_push (TV_JUMP);
2864 rebuild_jump_labels (insns);
2865 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2866 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2867 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2868 /* CFG is no longer maintained up-to-date. */
2869 free_bb_for_insn ();
2870 timevar_pop (TV_JUMP);
2872 if (flag_expensive_optimizations)
2874 timevar_push (TV_CSE);
2875 reg_scan (insns, max_reg_num (), 1);
2876 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2877 timevar_pop (TV_CSE);
2881 close_dump_file (DFI_gcse, print_rtl, insns);
2882 timevar_pop (TV_GCSE);
2885 flag_cse_skip_blocks = save_csb;
2886 flag_cse_follow_jumps = save_cfj;
2889 /* Move constant computations out of loops. */
2893 timevar_push (TV_LOOP);
2894 open_dump_file (DFI_loop, decl);
2895 free_bb_for_insn ();
2897 if (flag_rerun_loop_opt)
2899 cleanup_barriers ();
2901 /* We only want to perform unrolling once. */
2902 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2904 /* The first call to loop_optimize makes some instructions
2905 trivially dead. We delete those instructions now in the
2906 hope that doing so will make the heuristics in loop work
2907 better and possibly speed up compilation. */
2908 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2910 /* The regscan pass is currently necessary as the alias
2911 analysis code depends on this information. */
2912 reg_scan (insns, max_reg_num (), 1);
2914 cleanup_barriers ();
2915 loop_optimize (insns, rtl_dump_file,
2916 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2917 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2919 close_dump_file (DFI_loop, print_rtl, insns);
2920 timevar_pop (TV_LOOP);
2927 timevar_push (TV_CSE2);
2928 open_dump_file (DFI_cse2, decl);
2930 if (flag_rerun_cse_after_loop)
2932 /* Running another jump optimization pass before the second
2933 cse pass sometimes simplifies the RTL enough to allow
2934 the second CSE pass to do a better job. Jump_optimize can change
2935 max_reg_num so we must rerun reg_scan afterwards.
2936 ??? Rework to not call reg_scan so often. */
2937 timevar_push (TV_JUMP);
2939 /* The previous call to loop_optimize makes some instructions
2940 trivially dead. We delete those instructions now in the
2941 hope that doing so will make the heuristics in jump work
2942 better and possibly speed up compilation. */
2943 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2945 reg_scan (insns, max_reg_num (), 0);
2947 timevar_push (TV_IFCVT);
2949 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2950 cleanup_cfg (CLEANUP_EXPENSIVE);
2953 timevar_pop(TV_IFCVT);
2955 timevar_pop (TV_JUMP);
2957 /* CFG is no longer maintained up-to-date. */
2958 free_bb_for_insn ();
2959 reg_scan (insns, max_reg_num (), 0);
2960 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2964 timevar_push (TV_JUMP);
2965 rebuild_jump_labels (insns);
2966 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2967 cleanup_cfg (CLEANUP_EXPENSIVE);
2968 /* CFG is no longer maintained up-to-date. */
2969 free_bb_for_insn ();
2970 timevar_pop (TV_JUMP);
2974 close_dump_file (DFI_cse2, print_rtl, insns);
2975 timevar_pop (TV_CSE2);
2980 cse_not_expected = 1;
2984 /* Do control and data flow analysis; wrote some of the results to
2987 timevar_push (TV_FLOW);
2988 open_dump_file (DFI_cfg, decl);
2990 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2991 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2992 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2993 check_function_return_warnings ();
2995 /* It may make more sense to mark constant functions after dead code is
2996 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2997 may insert code making function non-constant, but we still must consider
2998 it as constant, otherwise -fbranch-probabilities will not read data back.
3000 life_analyzis rarely eliminates modification of external memory.
3002 mark_constant_function ();
3004 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3006 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3008 timevar_push (TV_BRANCH_PROB);
3009 open_dump_file (DFI_bp, decl);
3013 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3014 timevar_pop (TV_BRANCH_PROB);
3017 open_dump_file (DFI_life, decl);
3022 /* Discover and record the loop depth at the head of each basic
3023 block. The loop infrastructure does the real job for us. */
3024 flow_loops_find (&loops, LOOP_TREE);
3026 /* Estimate using heuristics if no profiling info is available. */
3027 if (flag_guess_branch_prob)
3028 estimate_probability (&loops);
3031 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3033 flow_loops_free (&loops);
3035 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3036 timevar_pop (TV_FLOW);
3040 if (warn_uninitialized || extra_warnings)
3042 uninitialized_vars_warning (DECL_INITIAL (decl));
3044 setjmp_args_warning ();
3049 if (initialize_uninitialized_subregs ())
3051 /* Insns were inserted, so things might look a bit different. */
3052 insns = get_insns ();
3053 life_analysis (insns, rtl_dump_file,
3054 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES));
3058 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3062 /* If -opt, try combining insns through substitution. */
3066 int rebuild_jump_labels_after_combine = 0;
3068 timevar_push (TV_COMBINE);
3069 open_dump_file (DFI_combine, decl);
3071 rebuild_jump_labels_after_combine
3072 = combine_instructions (insns, max_reg_num ());
3074 /* Always purge dead edges, as we may eliminate an insn throwing
3076 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true);
3078 /* Combining insns may have turned an indirect jump into a
3079 direct jump. Rebuid the JUMP_LABEL fields of jumping
3081 if (rebuild_jump_labels_after_combine)
3083 timevar_push (TV_JUMP);
3084 rebuild_jump_labels (insns);
3085 timevar_pop (TV_JUMP);
3087 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3090 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3091 timevar_pop (TV_COMBINE);
3096 /* Rerun if-conversion, as combine may have simplified things enough to
3097 now meet sequence length restrictions. */
3100 timevar_push (TV_IFCVT);
3101 open_dump_file (DFI_ce, decl);
3107 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3108 timevar_pop (TV_IFCVT);
3111 /* Register allocation pre-pass, to reduce number of moves
3112 necessary for two-address machines. */
3113 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3115 timevar_push (TV_REGMOVE);
3116 open_dump_file (DFI_regmove, decl);
3118 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3120 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3121 timevar_pop (TV_REGMOVE);
3126 /* Do unconditional splitting before register allocation to allow machine
3127 description to add extra information not needed previously. */
3128 split_all_insns (1);
3130 /* Any of the several passes since flow1 will have munged register
3131 lifetime data a bit. */
3132 register_life_up_to_date = 0;
3134 #ifdef OPTIMIZE_MODE_SWITCHING
3135 timevar_push (TV_MODE_SWITCH);
3138 if (optimize_mode_switching (NULL))
3140 /* We did work, and so had to regenerate global life information.
3141 Take advantage of this and don't re-recompute register life
3142 information below. */
3143 register_life_up_to_date = 1;
3147 timevar_pop (TV_MODE_SWITCH);
3150 timevar_push (TV_SCHED);
3152 #ifdef INSN_SCHEDULING
3154 /* Print function header into sched dump now
3155 because doing the sched analysis makes some of the dump. */
3156 if (optimize > 0 && flag_schedule_insns)
3158 open_dump_file (DFI_sched, decl);
3160 /* Do control and data sched analysis,
3161 and write some of the results to dump file. */
3163 schedule_insns (rtl_dump_file);
3165 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3167 /* Register lifetime information was updated as part of verifying
3169 register_life_up_to_date = 1;
3172 timevar_pop (TV_SCHED);
3176 /* Determine if the current function is a leaf before running reload
3177 since this can impact optimizations done by the prologue and
3178 epilogue thus changing register elimination offsets. */
3179 current_function_is_leaf = leaf_function_p ();
3181 timevar_push (TV_LOCAL_ALLOC);
3182 open_dump_file (DFI_lreg, decl);
3184 /* Allocate pseudo-regs that are used only within 1 basic block.
3186 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3187 jump optimizer after register allocation and reloading are finished. */
3189 if (! register_life_up_to_date)
3190 recompute_reg_usage (insns, ! optimize_size);
3192 /* Allocate the reg_renumber array. */
3193 allocate_reg_info (max_regno, FALSE, TRUE);
3195 /* And the reg_equiv_memory_loc array. */
3196 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3198 allocate_initial_values (reg_equiv_memory_loc);
3200 regclass (insns, max_reg_num (), rtl_dump_file);
3201 rebuild_label_notes_after_reload = local_alloc ();
3203 timevar_pop (TV_LOCAL_ALLOC);
3205 if (dump_file[DFI_lreg].enabled)
3207 timevar_push (TV_DUMP);
3209 dump_flow_info (rtl_dump_file);
3210 dump_local_alloc (rtl_dump_file);
3212 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3213 timevar_pop (TV_DUMP);
3218 timevar_push (TV_GLOBAL_ALLOC);
3219 open_dump_file (DFI_greg, decl);
3221 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3222 pass fixing up any insns that are invalid. */
3225 failure = global_alloc (rtl_dump_file);
3228 build_insn_chain (insns);
3229 failure = reload (insns, 0);
3232 timevar_pop (TV_GLOBAL_ALLOC);
3234 if (dump_file[DFI_greg].enabled)
3236 timevar_push (TV_DUMP);
3238 dump_global_regs (rtl_dump_file);
3240 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3241 timevar_pop (TV_DUMP);
3245 goto exit_rest_of_compilation;
3249 open_dump_file (DFI_postreload, decl);
3251 /* Do a very simple CSE pass over just the hard registers. */
3254 timevar_push (TV_RELOAD_CSE_REGS);
3255 reload_cse_regs (insns);
3256 timevar_pop (TV_RELOAD_CSE_REGS);
3259 /* Register allocation and reloading may have turned an indirect jump into
3260 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3261 jumping instructions. */
3262 if (rebuild_label_notes_after_reload)
3264 timevar_push (TV_JUMP);
3266 rebuild_jump_labels (insns);
3268 timevar_pop (TV_JUMP);
3271 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3273 /* Re-create the death notes which were deleted during reload. */
3274 timevar_push (TV_FLOW2);
3275 open_dump_file (DFI_flow2, decl);
3277 #ifdef ENABLE_CHECKING
3278 verify_flow_info ();
3281 /* If optimizing, then go ahead and split insns now. */
3283 split_all_insns (0);
3285 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3287 /* On some machines, the prologue and epilogue code, or parts thereof,
3288 can be represented as RTL. Doing so lets us schedule insns between
3289 it and the rest of the code and also allows delayed branch
3290 scheduling to operate in the epilogue. */
3291 thread_prologue_and_epilogue_insns (insns);
3293 /* Cross-jumping is O(N^3) on the number of edges, thus trying to
3294 perform cross-jumping on flow graphs which have a high connectivity
3295 will take a long time. This is similar to the test to disable GCSE. */
3296 cleanup_crossjump = CLEANUP_CROSSJUMP;
3297 if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20)
3299 if (optimize && warn_disabled_optimization)
3300 warning ("crossjump disabled: %d > 1000 basic blocks and %d >= 20 edges/basic block",
3301 n_basic_blocks, n_edges / n_basic_blocks);
3302 cleanup_crossjump = 0;
3307 cleanup_cfg (CLEANUP_EXPENSIVE | cleanup_crossjump);
3308 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3310 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3311 even for machines with possibly nonzero RETURN_POPS_ARGS
3312 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3313 push instructions will have popping returns. */
3314 #ifndef PUSH_ROUNDING
3315 if (!ACCUMULATE_OUTGOING_ARGS)
3317 combine_stack_adjustments ();
3322 flow2_completed = 1;
3324 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3325 timevar_pop (TV_FLOW2);
3327 #ifdef HAVE_peephole2
3328 if (optimize > 0 && flag_peephole2)
3330 timevar_push (TV_PEEPHOLE2);
3331 open_dump_file (DFI_peephole2, decl);
3333 peephole2_optimize (rtl_dump_file);
3335 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3336 timevar_pop (TV_PEEPHOLE2);
3340 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3342 timevar_push (TV_RENAME_REGISTERS);
3343 open_dump_file (DFI_rnreg, decl);
3345 if (flag_rename_registers)
3346 regrename_optimize ();
3347 if (flag_cprop_registers)
3348 copyprop_hardreg_forward ();
3350 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3351 timevar_pop (TV_RENAME_REGISTERS);
3356 timevar_push (TV_IFCVT2);
3357 open_dump_file (DFI_ce2, decl);
3361 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3362 timevar_pop (TV_IFCVT2);
3366 split_all_insns (1);
3369 #ifdef INSN_SCHEDULING
3370 if (optimize > 0 && flag_schedule_insns_after_reload)
3372 timevar_push (TV_SCHED2);
3373 open_dump_file (DFI_sched2, decl);
3375 /* Do control and data sched analysis again,
3376 and write some more of the results to dump file. */
3378 split_all_insns (1);
3380 schedule_insns (rtl_dump_file);
3382 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3383 timevar_pop (TV_SCHED2);
3389 #ifdef LEAF_REGISTERS
3390 current_function_uses_only_leaf_regs
3391 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3395 timevar_push (TV_REG_STACK);
3396 open_dump_file (DFI_stack, decl);
3398 reg_to_stack (insns, rtl_dump_file);
3400 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3401 timevar_pop (TV_REG_STACK);
3407 timevar_push (TV_REORDER_BLOCKS);
3408 open_dump_file (DFI_bbro, decl);
3410 /* Last attempt to optimize CFG, as life analysis possibly removed
3411 some instructions. Note that we can't rerun crossjump at this
3412 point, because it can turn a switch into a direct branch, which
3413 can leave the tablejump address calculation in the code, which
3414 can lead to referencing an undefined label. */
3415 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3416 if (flag_reorder_blocks)
3418 reorder_basic_blocks ();
3419 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3422 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3423 timevar_pop (TV_REORDER_BLOCKS);
3425 compute_alignments ();
3427 /* CFG is no longer maintained up-to-date. */
3428 free_bb_for_insn ();
3430 /* If a machine dependent reorganization is needed, call it. */
3431 #ifdef MACHINE_DEPENDENT_REORG
3432 timevar_push (TV_MACH_DEP);
3433 open_dump_file (DFI_mach, decl);
3435 MACHINE_DEPENDENT_REORG (insns);
3437 close_dump_file (DFI_mach, print_rtl, insns);
3438 timevar_pop (TV_MACH_DEP);
3443 purge_line_number_notes (insns);
3444 cleanup_barriers ();
3446 /* If a scheduling pass for delayed branches is to be done,
3447 call the scheduling code. */
3450 if (optimize > 0 && flag_delayed_branch)
3452 timevar_push (TV_DBR_SCHED);
3453 open_dump_file (DFI_dbr, decl);
3455 dbr_schedule (insns, rtl_dump_file);
3457 close_dump_file (DFI_dbr, print_rtl, insns);
3458 timevar_pop (TV_DBR_SCHED);
3464 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3465 timevar_push (TV_SHORTEN_BRANCH);
3466 split_all_insns_noflow ();
3467 timevar_pop (TV_SHORTEN_BRANCH);
3470 convert_to_eh_region_ranges ();
3472 /* Shorten branches. */
3473 timevar_push (TV_SHORTEN_BRANCH);
3474 shorten_branches (get_insns ());
3475 timevar_pop (TV_SHORTEN_BRANCH);
3477 current_function_nothrow = nothrow_function_p ();
3478 if (current_function_nothrow)
3479 /* Now we know that this can't throw; set the flag for the benefit
3480 of other functions later in this translation unit. */
3481 TREE_NOTHROW (current_function_decl) = 1;
3483 /* Now turn the rtl into assembler code. */
3485 timevar_push (TV_FINAL);
3490 /* Get the function's name, as described by its RTL. This may be
3491 different from the DECL_NAME name used in the source file. */
3493 x = DECL_RTL (decl);
3494 if (GET_CODE (x) != MEM)
3497 if (GET_CODE (x) != SYMBOL_REF)
3499 fnname = XSTR (x, 0);
3501 assemble_start_function (decl, fnname);
3502 final_start_function (insns, asm_out_file, optimize);
3503 final (insns, asm_out_file, optimize, 0);
3504 final_end_function ();
3506 #ifdef IA64_UNWIND_INFO
3507 /* ??? The IA-64 ".handlerdata" directive must be issued before
3508 the ".endp" directive that closes the procedure descriptor. */
3509 output_function_exception_table ();
3512 assemble_end_function (decl, fnname);
3514 #ifndef IA64_UNWIND_INFO
3515 /* Otherwise, it feels unclean to switch sections in the middle. */
3516 output_function_exception_table ();
3520 fflush (asm_out_file);
3522 /* Release all memory allocated by flow. */
3523 free_basic_block_vars (0);
3525 /* Release all memory held by regsets now. */
3526 regset_release_memory ();
3528 timevar_pop (TV_FINAL);
3532 /* Write DBX symbols if requested. */
3534 /* Note that for those inline functions where we don't initially
3535 know for certain that we will be generating an out-of-line copy,
3536 the first invocation of this routine (rest_of_compilation) will
3537 skip over this code by doing a `goto exit_rest_of_compilation;'.
3538 Later on, finish_compilation will call rest_of_compilation again
3539 for those inline functions that need to have out-of-line copies
3540 generated. During that call, we *will* be routed past here. */
3542 timevar_push (TV_SYMOUT);
3543 (*debug_hooks->function_decl) (decl);
3544 timevar_pop (TV_SYMOUT);
3546 exit_rest_of_compilation:
3548 /* In case the function was not output,
3549 don't leave any temporary anonymous types
3550 queued up for sdb output. */
3551 #ifdef SDB_DEBUGGING_INFO
3552 if (write_symbols == SDB_DEBUG)
3553 sdbout_types (NULL_TREE);
3556 reload_completed = 0;
3557 flow2_completed = 0;
3560 timevar_push (TV_FINAL);
3562 /* Clear out the insn_length contents now that they are no
3564 init_insn_lengths ();
3566 /* Clear out the real_constant_chain before some of the rtx's
3567 it runs through become garbage. */
3568 clear_const_double_mem ();
3570 /* Show no temporary slots allocated. */
3573 free_basic_block_vars (0);
3574 free_bb_for_insn ();
3576 timevar_pop (TV_FINAL);
3578 /* Make sure volatile mem refs aren't considered valid operands for
3579 arithmetic insns. We must call this here if this is a nested inline
3580 function, since the above code leaves us in the init_recog state
3581 (from final.c), and the function context push/pop code does not
3582 save/restore volatile_ok.
3584 ??? Maybe it isn't necessary for expand_start_function to call this
3585 anymore if we do it here? */
3587 init_recog_no_volatile ();
3589 /* We're done with this function. Free up memory if we can. */
3590 free_after_parsing (cfun);
3591 if (! DECL_DEFER_OUTPUT (decl))
3593 free_after_compilation (cfun);
3595 /* Clear integrate.c's pointer to the cfun structure we just
3597 DECL_SAVED_INSNS (decl) = 0;
3603 timevar_pop (TV_REST_OF_COMPILATION);
3613 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3614 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3615 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3616 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3617 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3618 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"));
3620 for (i = ARRAY_SIZE (f_options); i--;)
3622 const char *description = f_options[i].description;
3624 if (description != NULL && * description != 0)
3625 printf (" -f%-21s %s\n",
3626 f_options[i].string, _(description));
3629 printf (_(" -O[number] Set optimization level to [number]\n"));
3630 printf (_(" -Os Optimize for space rather than speed\n"));
3631 for (i = LAST_PARAM; i--;)
3633 const char *description = compiler_params[i].help;
3634 const int length = 21-strlen(compiler_params[i].option);
3636 if (description != NULL && * description != 0)
3637 printf (" --param %s=<value>%.*s%s\n",
3638 compiler_params[i].option,
3639 length > 0 ? length : 1, " ",
3642 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3643 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3644 printf (_(" -w Suppress warnings\n"));
3645 printf (_(" -W Enable extra warnings\n"));
3647 for (i = ARRAY_SIZE (W_options); i--;)
3649 const char *description = W_options[i].description;
3651 if (description != NULL && * description != 0)
3652 printf (" -W%-21s %s\n",
3653 W_options[i].string, _(description));
3656 printf (_(" -Wunused Enable unused warnings\n"));
3657 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3658 printf (_(" -p Enable function profiling\n"));
3659 printf (_(" -o <file> Place output into <file> \n"));
3661 -G <number> Put global and static data smaller than <number>\n\
3662 bytes into a special section (on some targets)\n"));
3664 for (i = ARRAY_SIZE (debug_args); i--;)
3666 if (debug_args[i].description != NULL)
3667 printf (" -g%-21s %s\n",
3668 debug_args[i].arg, _(debug_args[i].description));
3671 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3672 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3673 printf (_(" -version Display the compiler's version\n"));
3674 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3675 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3676 #if defined INSN_SCHEDULING
3677 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3679 printf (_(" --help Display this information\n"));
3684 /* Display descriptions of language specific options.
3685 If there is no description, note that there is an undocumented option.
3686 If the description is empty, do not display anything. (This allows
3687 options to be deliberately undocumented, for whatever reason).
3688 If the option string is missing, then this is a marker, indicating
3689 that the description string is in fact the name of a language, whose
3690 language specific options are to follow. */
3692 if (ARRAY_SIZE (documented_lang_options) > 1)
3694 printf (_("\nLanguage specific options:\n"));
3696 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3698 const char *description = documented_lang_options[i].description;
3699 const char *option = documented_lang_options[i].option;
3701 if (description == NULL)
3706 printf (_(" %-23.23s [undocumented]\n"), option);
3708 else if (*description == 0)
3710 else if (option == NULL)
3714 (_("\nThere are undocumented %s specific options as well.\n"),
3718 printf (_("\n Options for %s:\n"), description);
3723 printf (" %-23.23s %s\n", option, _(description));
3728 printf (_("\nThere are undocumented %s specific options as well.\n"),
3731 display_target_options ();
3735 display_target_options ()
3738 static bool displayed = false;
3740 /* Avoid double printing for --help --target-help. */
3745 if (ARRAY_SIZE (target_switches) > 1
3746 #ifdef TARGET_OPTIONS
3747 || ARRAY_SIZE (target_options) > 1
3755 printf (_("\nTarget specific options:\n"));
3757 for (i = ARRAY_SIZE (target_switches); i--;)
3759 const char *option = target_switches[i].name;
3760 const char *description = target_switches[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));
3775 #ifdef TARGET_OPTIONS
3776 for (i = ARRAY_SIZE (target_options); i--;)
3778 const char *option = target_options[i].prefix;
3779 const char *description = target_options[i].description;
3781 if (option == NULL || *option == 0)
3783 else if (description == NULL)
3788 printf (_(" -m%-23.23s [undocumented]\n"), option);
3790 else if (* description != 0)
3791 doc += printf (" -m%-23.23s %s\n", option, _(description));
3797 printf (_("\nThere are undocumented target specific options as well.\n"));
3799 printf (_(" They exist, but they are not documented.\n"));
3804 /* Parse a -d... command line switch. */
3807 decode_d_option (arg)
3816 for (i = 0; i < (int) DFI_MAX; ++i)
3817 dump_file[i].enabled = 1;
3823 flag_print_asm_name = 1;
3826 flag_dump_rtl_in_asm = 1;
3827 flag_print_asm_name = 1;
3830 graph_dump_format = vcg;
3833 rtl_dump_and_exit = 1;
3836 (*lang_hooks.set_yydebug) (1);
3838 case 'D': /* These are handled by the preprocessor. */
3844 for (i = 0; i < (int) DFI_MAX; ++i)
3845 if (c == dump_file[i].debug_switch)
3847 dump_file[i].enabled = 1;
3852 warning ("unrecognized gcc debugging option: %c", c);
3857 /* Parse a -f... command line switch. ARG is the value after the -f.
3858 It is safe to access 'ARG - 2' to generate the full switch name.
3859 Return the number of strings consumed. */
3862 decode_f_option (arg)
3866 const char *option_value = NULL;
3868 /* Search for the option in the table of binary f options. */
3869 for (j = ARRAY_SIZE (f_options); j--;)
3871 if (!strcmp (arg, f_options[j].string))
3873 *f_options[j].variable = f_options[j].on_value;
3877 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3878 && ! strcmp (arg + 3, f_options[j].string))
3880 *f_options[j].variable = ! f_options[j].on_value;
3885 if (!strcmp (arg, "fast-math"))
3886 set_fast_math_flags ();
3887 else if (!strcmp (arg, "no-fast-math"))
3888 set_no_fast_math_flags ();
3889 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3890 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3893 read_integral_parameter (option_value, arg - 2,
3895 set_param_value ("max-inline-insns", val);
3897 #ifdef INSN_SCHEDULING
3898 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3899 fix_sched_param ("verbose", option_value);
3901 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3902 fix_register (option_value, 1, 1);
3903 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3904 fix_register (option_value, 0, 1);
3905 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3906 fix_register (option_value, 0, 0);
3907 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3908 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3909 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3911 = read_integral_parameter (option_value, arg - 2, align_functions);
3912 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3913 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3914 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3916 = read_integral_parameter (option_value, arg - 2, align_labels);
3917 else if ((option_value
3918 = skip_leading_substring (arg, "stack-limit-register=")))
3920 int reg = decode_reg_name (option_value);
3922 error ("unrecognized register name `%s'", option_value);
3924 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3926 else if ((option_value
3927 = skip_leading_substring (arg, "stack-limit-symbol=")))
3930 nm = ggc_strdup (option_value);
3931 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3933 else if ((option_value
3934 = skip_leading_substring (arg, "message-length=")))
3935 output_set_maximum_length
3936 (&global_dc->buffer, read_integral_parameter
3937 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3938 else if ((option_value
3939 = skip_leading_substring (arg, "diagnostics-show-location=")))
3941 if (!strcmp (option_value, "once"))
3942 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3943 else if (!strcmp (option_value, "every-line"))
3944 diagnostic_prefixing_rule (global_dc)
3945 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3947 error ("unrecognized option `%s'", arg - 2);
3949 else if (!strcmp (arg, "no-stack-limit"))
3950 stack_limit_rtx = NULL_RTX;
3951 else if (!strcmp (arg, "preprocessed"))
3952 /* Recognise this switch but do nothing. This prevents warnings
3953 about an unrecognized switch if cpplib has not been linked in. */
3961 /* Parse a -W... command line switch. ARG is the value after the -W.
3962 It is safe to access 'ARG - 2' to generate the full switch name.
3963 Return the number of strings consumed. */
3966 decode_W_option (arg)
3969 const char *option_value = NULL;
3972 /* Search for the option in the table of binary W options. */
3974 for (j = ARRAY_SIZE (W_options); j--;)
3976 if (!strcmp (arg, W_options[j].string))
3978 *W_options[j].variable = W_options[j].on_value;
3982 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3983 && ! strcmp (arg + 3, W_options[j].string))
3985 *W_options[j].variable = ! W_options[j].on_value;
3990 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3991 warning ("-Wid-clash-LEN is no longer supported");
3992 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3994 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3996 warn_larger_than = larger_than_size != -1;
3998 else if (!strcmp (arg, "unused"))
4002 else if (!strcmp (arg, "no-unused"))
4012 /* Parse a -g... command line switch. ARG is the value after the -g.
4013 It is safe to access 'ARG - 2' to generate the full switch name.
4014 Return the number of strings consumed. */
4017 decode_g_option (arg)
4020 static unsigned level=0;
4021 /* A lot of code assumes write_symbols == NO_DEBUG if the
4022 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4023 of what debugging type has been selected). This records the
4024 selected type. It is an error to specify more than one
4026 static enum debug_info_type selected_debug_type = NO_DEBUG;
4027 /* Non-zero if debugging format has been explicitly set.
4028 -g and -ggdb don't explicitly set the debugging format so
4029 -gdwarf -g3 is equivalent to -gdwarf3. */
4030 static int type_explicitly_set_p = 0;
4031 /* Indexed by enum debug_info_type. */
4032 static const char *const debug_type_names[] =
4034 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4037 /* The maximum admissible debug level value. */
4038 static const unsigned max_debug_level = 3;
4040 /* Look up ARG in the table. */
4041 for (da = debug_args; da->arg; da++)
4043 const int da_len = strlen (da->arg);
4045 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4047 enum debug_info_type type = da->debug_type;
4048 const char *p = arg + da_len;
4050 if (*p && ! ISDIGIT (*p))
4053 /* A debug flag without a level defaults to level 2.
4054 Note we do not want to call read_integral_parameter
4055 for that case since it will call atoi which
4058 ??? We may want to generalize the interface to
4059 read_integral_parameter to better handle this case
4060 if this case shows up often. */
4062 level = read_integral_parameter (p, 0, max_debug_level + 1);
4064 level = (level == 0) ? 2 : level;
4066 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4068 error ("use -gdwarf -g%d for DWARF v1, level %d",
4071 error ("use -gdwarf-2 for DWARF v2");
4074 if (level > max_debug_level)
4077 ignoring option `%s' due to invalid debug level specification",
4079 level = debug_info_level;
4082 if (type == NO_DEBUG)
4084 type = PREFERRED_DEBUGGING_TYPE;
4086 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4088 #ifdef DWARF2_DEBUGGING_INFO
4089 type = DWARF2_DEBUG;
4091 #ifdef DBX_DEBUGGING_INFO
4098 if (type == NO_DEBUG)
4099 warning ("`%s': unknown or unsupported -g option", arg - 2);
4101 /* Does it conflict with an already selected type? */
4102 if (type_explicitly_set_p
4103 /* -g/-ggdb don't conflict with anything. */
4104 && da->debug_type != NO_DEBUG
4105 && type != selected_debug_type)
4106 warning ("`%s' ignored, conflicts with `-g%s'",
4107 arg - 2, debug_type_names[(int) selected_debug_type]);
4110 /* If the format has already been set, -g/-ggdb
4111 only change the debug level. */
4112 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4113 /* Don't change debugging type. */
4117 selected_debug_type = type;
4118 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4121 write_symbols = (level == 0
4123 : selected_debug_type);
4124 use_gnu_debug_info_extensions = da->use_extensions_p;
4125 debug_info_level = (enum debug_info_level) level;
4138 /* Decode the first argument in the argv as a language-independent option.
4139 Return the number of strings consumed. */
4142 independent_decode_option (argc, argv)
4146 char *arg = argv[0];
4148 if (arg[0] != '-' || arg[1] == 0)
4160 if (!strcmp (arg, "-help"))
4163 exit_after_options = 1;
4166 if (!strcmp (arg, "-target-help"))
4168 display_target_options ();
4169 exit_after_options = 1;
4172 if (!strcmp (arg, "-version"))
4174 print_version (stderr, "");
4175 exit_after_options = 1;
4178 /* Handle '--param <name>=<value>'. */
4179 if (strcmp (arg, "-param") == 0)
4185 error ("-param option missing argument");
4189 /* Get the '<name>=<value>' parameter. */
4191 /* Look for the `='. */
4192 equal = strchr (arg, '=');
4194 error ("invalid --param option: %s", arg);
4199 /* Zero out the `=' sign so that we get two separate strings. */
4201 /* Figure out what value is specified. */
4202 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4203 if (val != INVALID_PARAM_VAL)
4204 set_param_value (arg, val);
4206 error ("invalid parameter value `%s'", equal + 1);
4221 /* Already been treated in main (). Do nothing. */
4225 set_target_switch (arg + 1);
4229 return decode_f_option (arg + 1);
4232 return decode_g_option (arg + 1);
4235 if (!strcmp (arg, "dumpbase"))
4240 dump_base_name = argv[1];
4244 decode_d_option (arg + 1);
4248 if (!strcmp (arg, "pedantic"))
4250 else if (!strcmp (arg, "pedantic-errors"))
4251 flag_pedantic_errors = pedantic = 1;
4252 else if (arg[1] == 0)
4259 if (!strcmp (arg, "quiet"))
4266 if (!strcmp (arg, "version"))
4274 inhibit_warnings = 1;
4283 /* We save the value of warn_uninitialized, since if they put
4284 -Wuninitialized on the command line, we need to generate a
4285 warning about not using it without also specifying -O. */
4286 if (warn_uninitialized != 1)
4287 warn_uninitialized = 2;
4290 return decode_W_option (arg + 1);
4294 if (!strncmp (arg, "aux-info", 8))
4301 aux_info_file_name = argv[1];
4302 flag_gen_aux_info = 1;
4305 else if (arg[8] == '=')
4307 aux_info_file_name = arg + 9;
4308 flag_gen_aux_info = 1;
4323 asm_file_name = argv[1];
4338 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4343 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4347 if (g_switch_val == -1)
4351 g_switch_set = TRUE;
4352 g_switch_value = g_switch_val;
4362 /* Decode -m switches. */
4363 /* Decode the switch -mNAME. */
4366 set_target_switch (name)
4370 int valid_target_option = 0;
4372 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4373 if (!strcmp (target_switches[j].name, name))
4375 if (target_switches[j].value < 0)
4376 target_flags &= ~-target_switches[j].value;
4378 target_flags |= target_switches[j].value;
4379 valid_target_option = 1;
4382 #ifdef TARGET_OPTIONS
4383 if (!valid_target_option)
4384 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4386 int len = strlen (target_options[j].prefix);
4387 if (!strncmp (target_options[j].prefix, name, len))
4389 *target_options[j].variable = name + len;
4390 valid_target_option = 1;
4395 if (!valid_target_option)
4396 error ("invalid option `%s'", name);
4399 /* Print version information to FILE.
4400 Each line begins with INDENT (for the case where FILE is the
4401 assembler output file). */
4404 print_version (file, indent)
4409 #define __VERSION__ "[?]"
4413 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4415 "%s%s%s version %s (%s) compiled by CC.\n"
4417 , indent, *indent != 0 ? " " : "",
4418 lang_hooks.name, version_string, TARGET_NAME,
4419 indent, __VERSION__);
4422 /* Print an option value and return the adjusted position in the line.
4423 ??? We don't handle error returns from fprintf (disk full); presumably
4424 other code will catch a disk full though. */
4427 print_single_switch (file, pos, max, indent, sep, term, type, name)
4430 const char *indent, *sep, *term, *type, *name;
4432 /* The ultrix fprintf returns 0 on success, so compute the result we want
4433 here since we need it for the following test. */
4434 int len = strlen (sep) + strlen (type) + strlen (name);
4439 fprintf (file, "%s", term);
4444 fprintf (file, "%s", indent);
4445 pos = strlen (indent);
4447 fprintf (file, "%s%s%s", sep, type, name);
4452 /* Print active target switches to FILE.
4453 POS is the current cursor position and MAX is the size of a "line".
4454 Each line begins with INDENT and ends with TERM.
4455 Each switch is separated from the next by SEP. */
4458 print_switch_values (file, pos, max, indent, sep, term)
4461 const char *indent, *sep, *term;
4466 /* Print the options as passed. */
4468 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4469 _("options passed: "), "");
4471 for (p = &save_argv[1]; *p != NULL; p++)
4475 if (strcmp (*p, "-o") == 0)
4481 if (strcmp (*p, "-quiet") == 0)
4483 if (strcmp (*p, "-version") == 0)
4488 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4491 fprintf (file, "%s", term);
4493 /* Print the -f and -m options that have been enabled.
4494 We don't handle language specific options but printing argv
4497 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4498 _("options enabled: "), "");
4500 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4501 if (*f_options[j].variable == f_options[j].on_value)
4502 pos = print_single_switch (file, pos, max, indent, sep, term,
4503 "-f", f_options[j].string);
4505 /* Print target specific options. */
4507 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4508 if (target_switches[j].name[0] != '\0'
4509 && target_switches[j].value > 0
4510 && ((target_switches[j].value & target_flags)
4511 == target_switches[j].value))
4513 pos = print_single_switch (file, pos, max, indent, sep, term,
4514 "-m", target_switches[j].name);
4517 #ifdef TARGET_OPTIONS
4518 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4519 if (*target_options[j].variable != NULL)
4522 sprintf (prefix, "-m%s", target_options[j].prefix);
4523 pos = print_single_switch (file, pos, max, indent, sep, term,
4524 prefix, *target_options[j].variable);
4528 fprintf (file, "%s", term);
4531 /* Open assembly code output file. Do this even if -fsyntax-only is
4532 on, because then the driver will have provided the name of a
4533 temporary file or bit bucket for us. NAME is the file specified on
4534 the command line, possibly NULL. */
4536 init_asm_output (name)
4539 if (name == NULL && asm_file_name == 0)
4540 asm_out_file = stdout;
4543 if (asm_file_name == 0)
4545 int len = strlen (dump_base_name);
4546 char *dumpname = (char *) xmalloc (len + 6);
4547 memcpy (dumpname, dump_base_name, len + 1);
4548 strip_off_ending (dumpname, len);
4549 strcat (dumpname, ".s");
4550 asm_file_name = dumpname;
4552 if (!strcmp (asm_file_name, "-"))
4553 asm_out_file = stdout;
4555 asm_out_file = fopen (asm_file_name, "w");
4556 if (asm_out_file == 0)
4557 fatal_io_error ("can't open %s for writing", asm_file_name);
4560 #ifdef IO_BUFFER_SIZE
4561 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4562 _IOFBF, IO_BUFFER_SIZE);
4565 if (!flag_syntax_only)
4567 #ifdef ASM_FILE_START
4568 ASM_FILE_START (asm_out_file);
4571 #ifdef ASM_COMMENT_START
4572 if (flag_verbose_asm)
4574 /* Print the list of options in effect. */
4575 print_version (asm_out_file, ASM_COMMENT_START);
4576 print_switch_values (asm_out_file, 0, MAX_LINE,
4577 ASM_COMMENT_START, " ", "\n");
4578 /* Add a blank line here so it appears in assembler output but not
4580 fprintf (asm_out_file, "\n");
4586 /* Initialization of the front end environment, before command line
4587 options are parsed. Signal handlers, internationalization etc.
4588 ARGV0 is main's argv[0]. */
4590 general_init (argv0)
4595 p = argv0 + strlen (argv0);
4596 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4600 xmalloc_set_program_name (progname);
4602 gcc_init_libintl ();
4604 /* Install handler for SIGFPE, which may be received while we do
4605 compile-time floating point arithmetic. */
4606 signal (SIGFPE, float_signal);
4608 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4610 signal (SIGSEGV, crash_signal);
4613 signal (SIGILL, crash_signal);
4616 signal (SIGBUS, crash_signal);
4619 signal (SIGABRT, crash_signal);
4621 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4622 signal (SIGIOT, crash_signal);
4625 /* Initialize the diagnostics reporting machinery, so option parsing
4626 can give warnings and errors. */
4627 diagnostic_initialize (global_dc);
4630 /* Parse command line options and set default flag values, called
4631 after language-independent option-independent initialization. Do
4632 minimal options processing. Outputting diagnostics is OK, but GC
4633 and identifier hashtables etc. are not initialized yet. */
4635 parse_options_and_default_flags (argc, argv)
4641 /* Save in case md file wants to emit args as a comment. */
4645 /* Initialize register usage now so switches may override. */
4648 /* Register the language-independent parameters. */
4649 add_params (lang_independent_params, LAST_PARAM);
4651 /* Perform language-specific options initialization. */
4652 (*lang_hooks.init_options) ();
4654 /* Scan to see what optimization level has been specified. That will
4655 determine the default value of many flags. */
4656 for (i = 1; i < argc; i++)
4658 if (!strcmp (argv[i], "-O"))
4663 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4665 /* Handle -Os, -O2, -O3, -O69, ... */
4666 char *p = &argv[i][2];
4668 if ((p[0] == 's') && (p[1] == 0))
4672 /* Optimizing for size forces optimize to be 2. */
4677 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4678 if (optimize_val != -1)
4680 optimize = optimize_val;
4682 #ifdef FORCE_OPTIMIZATION_DOWNGRADE
4683 #warning FORCE_OPTIMIZATION_DOWNGRADE
4684 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE)
4686 optimize = FORCE_OPTIMIZATION_DOWNGRADE;
4687 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***",
4689 FORCE_OPTIMIZATION_DOWNGRADE);
4692 #endif /*FORCE_OPTIMIZATION_DOWNGRADE*/
4694 #if defined(TRY_WITHOUT_THIS__alpha__)
4697 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***",
4700 #endif /*__alpha__*/
4710 flag_merge_constants = 0;
4716 flag_thread_jumps = 1;
4718 flag_delayed_branch = 1;
4720 #ifdef CAN_DEBUG_WITHOUT_FP
4721 flag_omit_frame_pointer = 1;
4723 flag_guess_branch_prob = 1;
4724 flag_cprop_registers = 1;
4729 flag_optimize_sibling_calls = 1;
4730 flag_cse_follow_jumps = 1;
4731 flag_cse_skip_blocks = 1;
4733 flag_expensive_optimizations = 1;
4734 flag_strength_reduce = 1;
4735 flag_rerun_cse_after_loop = 1;
4736 flag_rerun_loop_opt = 1;
4737 flag_caller_saves = 1;
4740 #ifdef INSN_SCHEDULING
4741 flag_schedule_insns = 1;
4742 flag_schedule_insns_after_reload = 1;
4745 flag_strict_aliasing = 1;
4746 flag_delete_null_pointer_checks = 1;
4747 flag_reorder_blocks = 1;
4752 flag_inline_functions = 1;
4753 flag_rename_registers = 1;
4761 align_functions = 1;
4764 /* Initialize whether `char' is signed. */
4765 flag_signed_char = DEFAULT_SIGNED_CHAR;
4766 #ifdef DEFAULT_SHORT_ENUMS
4767 /* Initialize how much space enums occupy, by default. */
4768 flag_short_enums = DEFAULT_SHORT_ENUMS;
4771 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4774 set_target_switch ("");
4776 /* Unwind tables are always present in an ABI-conformant IA-64
4777 object file, so the default should be ON. */
4778 #ifdef IA64_UNWIND_INFO
4779 flag_unwind_tables = IA64_UNWIND_INFO;
4782 #ifdef OPTIMIZATION_OPTIONS
4783 /* Allow default optimizations to be specified on a per-machine basis. */
4784 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4787 /* Perform normal command line switch decoding. */
4788 for (i = 1; i < argc;)
4791 int indep_processed;
4793 /* Give the language a chance to decode the option for itself. */
4794 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4796 if (lang_processed >= 0)
4797 /* Now see if the option also has a language independent meaning.
4798 Some options are both language specific and language independent,
4800 indep_processed = independent_decode_option (argc - i, argv + i);
4803 lang_processed = -lang_processed;
4804 indep_processed = 0;
4807 if (lang_processed || indep_processed)
4808 i += MAX (lang_processed, indep_processed);
4811 const char *option = NULL;
4812 const char *lang = NULL;
4815 /* It is possible that the command line switch is not valid for the
4816 current language, but it is valid for another language. In order
4817 to be compatible with previous versions of the compiler (which
4818 did not issue an error message in this case) we check for this
4819 possibility here. If we do find a match, then if extra_warnings
4820 is set we generate a warning message, otherwise we will just
4821 ignore the option. */
4822 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4824 option = documented_lang_options[j].option;
4827 lang = documented_lang_options[j].description;
4828 else if (! strncmp (argv[i], option, strlen (option)))
4832 if (j != ARRAY_SIZE (documented_lang_options))
4836 warning ("ignoring command line option '%s'", argv[i]);
4839 ("(it is valid for %s but not the selected language)",
4843 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4844 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4846 error ("unrecognized option `%s'", argv[i]);
4852 if (flag_no_inline == 2)
4855 flag_really_no_inline = flag_no_inline;
4857 /* Set flag_no_inline before the post_options () hook. The C front
4858 ends use it to determine tree inlining defaults. FIXME: such
4859 code should be lang-independent when all front ends use tree
4860 inlining, in which case it, and this condition, should be moved
4861 to the top of process_options() instead. */
4864 /* Inlining does not work if not optimizing,
4865 so force it not to be done. */
4869 /* The c_decode_option function and decode_option hook set
4870 this to `2' if -Wall is used, so we can avoid giving out
4871 lots of errors for people who don't realize what -Wall does. */
4872 if (warn_uninitialized == 1)
4873 warning ("-Wuninitialized is not supported without -O");
4876 if (flag_really_no_inline == 2)
4877 flag_really_no_inline = flag_no_inline;
4879 /* All command line options have been parsed; allow the front end to
4880 perform consistency checks, etc. */
4881 (*lang_hooks.post_options) ();
4884 /* Process the options that have been parsed. */
4888 #ifdef OVERRIDE_OPTIONS
4889 /* Some machines may reject certain combinations of options. */
4893 /* Set up the align_*_log variables, defaulting them to 1 if they
4894 were still unset. */
4895 if (align_loops <= 0) align_loops = 1;
4896 if (align_loops_max_skip > align_loops || !align_loops)
4897 align_loops_max_skip = align_loops - 1;
4898 align_loops_log = floor_log2 (align_loops * 2 - 1);
4899 if (align_jumps <= 0) align_jumps = 1;
4900 if (align_jumps_max_skip > align_jumps || !align_jumps)
4901 align_jumps_max_skip = align_jumps - 1;
4902 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4903 if (align_labels <= 0) align_labels = 1;
4904 align_labels_log = floor_log2 (align_labels * 2 - 1);
4905 if (align_labels_max_skip > align_labels || !align_labels)
4906 align_labels_max_skip = align_labels - 1;
4907 if (align_functions <= 0) align_functions = 1;
4908 align_functions_log = floor_log2 (align_functions * 2 - 1);
4910 /* Unrolling all loops implies that standard loop unrolling must also
4912 if (flag_unroll_all_loops)
4913 flag_unroll_loops = 1;
4914 /* Loop unrolling requires that strength_reduction be on also. Silently
4915 turn on strength reduction here if it isn't already on. Also, the loop
4916 unrolling code assumes that cse will be run after loop, so that must
4917 be turned on also. */
4918 if (flag_unroll_loops)
4920 flag_strength_reduce = 1;
4921 flag_rerun_cse_after_loop = 1;
4924 if (flag_non_call_exceptions)
4925 flag_asynchronous_unwind_tables = 1;
4926 if (flag_asynchronous_unwind_tables)
4927 flag_unwind_tables = 1;
4929 /* Warn about options that are not supported on this machine. */
4930 #ifndef INSN_SCHEDULING
4931 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4932 warning ("instruction scheduling not supported on this target machine");
4935 if (flag_delayed_branch)
4936 warning ("this target machine does not have delayed branches");
4939 /* Some operating systems do not allow profiling without a frame
4941 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4943 && flag_omit_frame_pointer)
4945 error ("profiling does not work without a frame pointer");
4946 flag_omit_frame_pointer = 0;
4949 user_label_prefix = USER_LABEL_PREFIX;
4950 if (flag_leading_underscore != -1)
4952 /* If the default prefix is more complicated than "" or "_",
4953 issue a warning and ignore this option. */
4954 if (user_label_prefix[0] == 0 ||
4955 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4957 user_label_prefix = flag_leading_underscore ? "_" : "";
4960 warning ("-f%sleading-underscore not supported on this target machine",
4961 flag_leading_underscore ? "" : "no-");
4964 /* If we are in verbose mode, write out the version and maybe all the
4965 option flags in use. */
4968 print_version (stderr, "");
4970 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4976 if (flag_syntax_only)
4978 write_symbols = NO_DEBUG;
4982 /* Now we know write_symbols, set up the debug hooks based on it.
4983 By default we do nothing for debug output. */
4984 #if defined(DBX_DEBUGGING_INFO)
4985 if (write_symbols == DBX_DEBUG)
4986 debug_hooks = &dbx_debug_hooks;
4988 #if defined(XCOFF_DEBUGGING_INFO)
4989 if (write_symbols == XCOFF_DEBUG)
4990 debug_hooks = &xcoff_debug_hooks;
4992 #ifdef SDB_DEBUGGING_INFO
4993 if (write_symbols == SDB_DEBUG)
4994 debug_hooks = &sdb_debug_hooks;
4996 #ifdef DWARF_DEBUGGING_INFO
4997 if (write_symbols == DWARF_DEBUG)
4998 debug_hooks = &dwarf_debug_hooks;
5000 #ifdef DWARF2_DEBUGGING_INFO
5001 if (write_symbols == DWARF2_DEBUG)
5002 debug_hooks = &dwarf2_debug_hooks;
5004 #ifdef VMS_DEBUGGING_INFO
5005 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5006 debug_hooks = &vmsdbg_debug_hooks;
5009 /* If auxiliary info generation is desired, open the output file.
5010 This goes in the same directory as the source file--unlike
5011 all the other output files. */
5012 if (flag_gen_aux_info)
5014 aux_info_file = fopen (aux_info_file_name, "w");
5015 if (aux_info_file == 0)
5016 fatal_io_error ("can't open %s", aux_info_file_name);
5019 if (! targetm.have_named_sections)
5021 if (flag_function_sections)
5023 warning ("-ffunction-sections not supported for this target");
5024 flag_function_sections = 0;
5026 if (flag_data_sections)
5028 warning ("-fdata-sections not supported for this target");
5029 flag_data_sections = 0;
5033 if (flag_function_sections && profile_flag)
5035 warning ("-ffunction-sections disabled; it makes profiling impossible");
5036 flag_function_sections = 0;
5039 #ifndef HAVE_prefetch
5040 if (flag_prefetch_loop_arrays)
5042 warning ("-fprefetch-loop-arrays not supported for this target");
5043 flag_prefetch_loop_arrays = 0;
5046 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5048 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5049 flag_prefetch_loop_arrays = 0;
5053 /* This combination of options isn't handled for i386 targets and doesn't
5054 make much sense anyway, so don't allow it. */
5055 if (flag_prefetch_loop_arrays && optimize_size)
5057 warning ("-fprefetch-loop-arrays is not supported with -Os");
5058 flag_prefetch_loop_arrays = 0;
5061 #ifndef OBJECT_FORMAT_ELF
5062 if (flag_function_sections && write_symbols != NO_DEBUG)
5063 warning ("-ffunction-sections may affect debugging on some targets");
5067 /* Language-independent initialization, before language-dependent
5070 lang_independent_init ()
5072 decl_printable_name = decl_name;
5073 lang_expand_expr = (lang_expand_expr_t) do_abort;
5075 /* Set the language-dependent identifier size. */
5076 tree_code_length[(int) IDENTIFIER_NODE]
5077 = ((lang_hooks.identifier_size - sizeof (struct tree_common)
5078 + sizeof (tree) - 1) / sizeof (tree));
5080 /* Initialize the garbage-collector, and string pools. */
5082 ggc_add_rtx_root (&stack_limit_rtx, 1);
5083 ggc_add_tree_root (¤t_function_decl, 1);
5084 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5089 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5090 || debug_info_level == DINFO_LEVEL_VERBOSE
5091 #ifdef VMS_DEBUGGING_INFO
5092 /* Enable line number info for traceback */
5093 || debug_info_level > DINFO_LEVEL_NONE
5095 || flag_test_coverage
5096 || warn_notreached);
5102 init_function_once ();
5103 init_stor_layout_once ();
5104 init_varasm_once ();
5105 init_EXPR_INSN_LIST_cache ();
5107 /* The following initialization functions need to generate rtl, so
5108 provide a dummy function context for them. */
5109 init_dummy_function_start ();
5112 if (flag_caller_saves)
5113 init_caller_save ();
5114 expand_dummy_function_end ();
5117 /* Language-dependent initialization. Returns non-zero on success. */
5119 lang_dependent_init (name)
5122 if (dump_base_name == 0)
5123 dump_base_name = name ? name : "gccdump";
5125 /* Front-end initialization. This hook can assume that GC,
5126 identifier hashes etc. are set up, but debug initialization is
5127 not done yet. This routine must return the original filename
5128 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5129 name = (*lang_hooks.init) (name);
5133 /* Is this duplication necessary? */
5134 name = ggc_strdup (name);
5135 main_input_filename = input_filename = name;
5136 init_asm_output (name);
5138 /* These create various _DECL nodes, so need to be called after the
5139 front end is initialized. */
5143 /* Put an entry on the input file stack for the main input file. */
5144 push_srcloc (input_filename, 0);
5146 /* If dbx symbol table desired, initialize writing it and output the
5147 predefined types. */
5148 timevar_push (TV_SYMOUT);
5150 #ifdef DWARF2_UNWIND_INFO
5151 if (dwarf2out_do_frame ())
5152 dwarf2out_frame_init ();
5155 /* Now we have the correct original filename, we can initialize
5157 (*debug_hooks->init) (name);
5159 timevar_pop (TV_SYMOUT);
5164 /* Clean up: close opened files, etc. */
5169 /* Close the dump files. */
5170 if (flag_gen_aux_info)
5172 fclose (aux_info_file);
5174 unlink (aux_info_file_name);
5177 /* Close non-debugging input and output files. Take special care to note
5178 whether fclose returns an error, since the pages might still be on the
5179 buffer chain while the file is open. */
5183 if (ferror (asm_out_file) != 0)
5184 fatal_io_error ("error writing to %s", asm_file_name);
5185 if (fclose (asm_out_file) != 0)
5186 fatal_io_error ("error closing %s", asm_file_name);
5189 /* Do whatever is necessary to finish printing the graphs. */
5190 if (graph_dump_format != no_graph)
5194 for (i = 0; i < (int) DFI_MAX; ++i)
5195 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5200 sprintf (seq, DUMPFILE_FORMAT, i);
5201 suffix = concat (seq, dump_file[i].extension, NULL);
5202 finish_graph_dump_file (dump_base_name, suffix);
5209 ggc_print_statistics ();
5210 stringpool_statistics ();
5211 dump_tree_statistics ();
5214 /* Free up memory for the benefit of leak detectors. */
5217 /* Language-specific end of compilation actions. */
5218 (*lang_hooks.finish) ();
5221 /* Initialize the compiler, and compile the input file. */
5225 /* The bulk of command line switch processing. */
5228 /* We cannot start timing until after options are processed since that
5229 says if we run timers or not. */
5231 timevar_start (TV_TOTAL);
5233 /* Language-independent initialization. Also sets up GC, identifier
5235 lang_independent_init ();
5237 /* Language-dependent initialization. Returns true on success. */
5238 if (lang_dependent_init (filename))
5243 /* Stop timing and print the times. */
5244 timevar_stop (TV_TOTAL);
5245 timevar_print (stderr);
5248 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5249 Decode command args, then call compile_file.
5250 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5251 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5253 It is not safe to call this function more than once. */
5256 toplev_main (argc, argv)
5262 /* Initialization of GCC's environment, and diagnostics. */
5263 general_init (argv [0]);
5265 /* Parse the options and do minimal processing; basically just
5266 enough to default flags appropriately. */
5267 parse_options_and_default_flags (argc, argv);
5269 /* Exit early if we can (e.g. -help). */
5270 if (!errorcount && !exit_after_options)
5273 if (errorcount || sorrycount)
5274 return (FATAL_EXIT_CODE);
5276 return (SUCCESS_EXIT_CODE);