1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
46 #include "insn-attr.h"
47 #include "insn-config.h"
48 #include "insn-flags.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
71 #include "langhooks.h"
73 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
74 #include "dwarf2out.h"
77 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
81 #ifdef SDB_DEBUGGING_INFO
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
94 /* Carry information from ASM_DECLARE_OBJECT_NAME
95 to ASM_FINISH_DECLARE_OBJECT. */
97 extern int size_directive_output;
98 extern tree last_assemble_variable_decl;
100 static void general_init PARAMS ((char *));
101 static void parse_options_and_default_flags PARAMS ((int, char **));
102 static void do_compile PARAMS ((void));
103 static void process_options PARAMS ((void));
104 static void lang_independent_init PARAMS ((void));
105 static int lang_dependent_init PARAMS ((const char *));
106 static void init_asm_output PARAMS ((const char *));
107 static void finalize PARAMS ((void));
109 static void set_target_switch PARAMS ((const char *));
111 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
112 static void compile_file PARAMS ((void));
113 static void display_help PARAMS ((void));
114 static void display_target_options PARAMS ((void));
116 static void decode_d_option PARAMS ((const char *));
117 static int decode_f_option PARAMS ((const char *));
118 static int decode_W_option PARAMS ((const char *));
119 static int decode_g_option PARAMS ((const char *));
120 static unsigned int independent_decode_option PARAMS ((int, char **));
122 static void print_version PARAMS ((FILE *, const char *));
123 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
124 const char *, const char *,
125 const char *, const char *));
126 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
127 const char *, const char *));
129 /* Nonzero to dump debug info whilst parsing (-dy option). */
130 static int set_yydebug;
132 /* Length of line when printing switch values. */
135 /* Name of program invoked, sans directories. */
137 const char *progname;
139 /* Copy of arguments to toplev_main. */
143 /* Name of current original source file (what was input to cpp).
144 This comes from each #-command in the actual input. */
146 const char *input_filename;
148 /* Name of top-level original source file (what was input to cpp).
149 This comes from the #-command at the beginning of the actual input.
150 If there isn't any there, then this is the cc1 input file name. */
152 const char *main_input_filename;
154 /* Current line number in real source file. */
158 /* Nonzero if it is unsafe to create any new pseudo registers. */
161 /* Stack of currently pending input files. */
163 struct file_stack *input_file_stack;
165 /* Incremented on each change to input_file_stack. */
166 int input_file_stack_tick;
168 /* Name to use as base of names for dump output files. */
170 const char *dump_base_name;
172 /* Format to use to print dumpfile index value */
173 #ifndef DUMPFILE_FORMAT
174 #define DUMPFILE_FORMAT ".%02d."
177 /* Bit flags that specify the machine subtype we are compiling for.
178 Bits are tested using macros TARGET_... defined in the tm.h file
179 and set by `-m...' switches. Must be defined in rtlanal.c. */
181 extern int target_flags;
183 /* Debug hooks - dependent upon command line options. */
185 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
187 /* Describes a dump file. */
189 struct dump_file_info
191 /* The unique extension to apply, e.g. ".jump". */
192 const char *const extension;
194 /* The -d<c> character that enables this dump file. */
195 char const debug_switch;
197 /* True if there is a corresponding graph dump file. */
198 char const graph_dump_p;
200 /* True if the user selected this dump. */
203 /* True if the files have been initialized (ie truncated). */
207 /* Enumerate the extant dump files. */
247 /* Describes all the dump files. Should be kept in order of the
248 pass and in sync with dump_file_index above.
250 Remaining -d letters:
256 static struct dump_file_info dump_file[DFI_MAX] =
258 { "rtl", 'r', 0, 0, 0 },
259 { "sibling", 'i', 0, 0, 0 },
260 { "eh", 'h', 0, 0, 0 },
261 { "jump", 'j', 0, 0, 0 },
262 { "ssa", 'e', 1, 0, 0 },
263 { "ssaccp", 'W', 1, 0, 0 },
264 { "ssadce", 'X', 1, 0, 0 },
265 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
266 { "null", 'u', 0, 0, 0 },
267 { "cse", 's', 0, 0, 0 },
268 { "addressof", 'F', 0, 0, 0 },
269 { "gcse", 'G', 1, 0, 0 },
270 { "loop", 'L', 1, 0, 0 },
271 { "cfg", 'f', 1, 0, 0 },
272 { "bp", 'b', 1, 0, 0 },
273 { "cse2", 't', 1, 0, 0 },
274 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
275 { "combine", 'c', 1, 0, 0 },
276 { "ce", 'C', 1, 0, 0 },
277 { "regmove", 'N', 1, 0, 0 },
278 { "sched", 'S', 1, 0, 0 },
279 { "lreg", 'l', 1, 0, 0 },
280 { "greg", 'g', 1, 0, 0 },
281 { "postreload", 'o', 1, 0, 0 },
282 { "flow2", 'w', 1, 0, 0 },
283 { "peephole2", 'z', 1, 0, 0 },
284 { "rnreg", 'n', 1, 0, 0 },
285 { "ce2", 'E', 1, 0, 0 },
286 { "sched2", 'R', 1, 0, 0 },
287 { "stack", 'k', 1, 0, 0 },
288 { "bbro", 'B', 1, 0, 0 },
289 { "mach", 'M', 1, 0, 0 },
290 { "dbr", 'd', 0, 0, 0 },
293 static int open_dump_file PARAMS ((enum dump_file_index, tree));
294 static void close_dump_file PARAMS ((enum dump_file_index,
295 void (*) (FILE *, rtx), rtx));
297 /* Other flags saying which kinds of debugging dump have been requested. */
299 int rtl_dump_and_exit;
300 int flag_print_asm_name;
301 static int version_flag;
302 static char *filename;
303 enum graph_dump_types graph_dump_format;
305 /* Name for output file of assembly code, specified with -o. */
309 /* Value of the -G xx switch, and whether it was passed or not. */
313 /* Type(s) of debugging information we are producing (if any).
314 See flags.h for the definitions of the different possible
315 types of debugging information. */
316 enum debug_info_type write_symbols = NO_DEBUG;
318 /* Level of debugging information we are producing. See flags.h
319 for the definitions of the different possible levels. */
320 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
322 /* Nonzero means use GNU-only extensions in the generated symbolic
323 debugging information. */
324 /* Currently, this only has an effect when write_symbols is set to
325 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
326 int use_gnu_debug_info_extensions = 0;
328 /* Nonzero means do optimizations. -O.
329 Particular numeric values stand for particular amounts of optimization;
330 thus, -O2 stores 2 here. However, the optimizations beyond the basic
331 ones are not controlled directly by this variable. Instead, they are
332 controlled by individual `flag_...' variables that are defaulted
333 based on this variable. */
337 /* Nonzero means optimize for size. -Os.
338 The only valid values are zero and non-zero. When optimize_size is
339 non-zero, optimize defaults to 2, but certain individual code
340 bloating optimizations are disabled. */
342 int optimize_size = 0;
344 /* Nonzero if we should exit after parsing options. */
345 static int exit_after_options = 0;
347 /* The FUNCTION_DECL for the function currently being compiled,
348 or 0 if between functions. */
349 tree current_function_decl;
351 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
353 tree current_function_func_begin_label;
355 /* Nonzero if doing dwarf2 duplicate elimination. */
357 int flag_eliminate_dwarf2_dups = 0;
359 /* Nonzero if generating code to do profiling. */
361 int profile_flag = 0;
363 /* Nonzero if generating code to profile program flow graph arcs. */
365 int profile_arc_flag = 0;
367 /* Nonzero if we should not attempt to generate thread-safe
368 code to profile program flow graph arcs. */
370 int flag_unsafe_profile_arcs = 0;
372 /* Nonzero if generating info for gcov to calculate line test coverage. */
374 int flag_test_coverage = 0;
376 /* Nonzero indicates that branch taken probabilities should be calculated. */
378 int flag_branch_probabilities = 0;
380 /* Nonzero if basic blocks should be reordered. */
382 int flag_reorder_blocks = 0;
384 /* Nonzero if registers should be renamed. */
386 int flag_rename_registers = 0;
387 int flag_cprop_registers = 0;
389 /* Nonzero for -pedantic switch: warn about anything
390 that standard spec forbids. */
394 /* Temporarily suppress certain warnings.
395 This is set while reading code from a system header file. */
397 int in_system_header = 0;
399 /* Don't print functions as they are compiled. -quiet. */
403 /* Print times taken by the various passes. -ftime-report. */
407 /* Print memory still in use at end of compilation (which may have little
408 to do with peak memory consumption). -fmem-report. */
412 /* Non-zero means to collect statistics which might be expensive
413 and to print them when we are done. */
414 int flag_detailed_statistics = 0;
419 /* Nonzero means `char' should be signed. */
421 int flag_signed_char;
423 /* Nonzero means give an enum type only as many bytes as it needs. */
425 int flag_short_enums;
427 /* Nonzero for -fcaller-saves: allocate values in regs that need to
428 be saved across function calls, if that produces overall better code.
429 Optional now, so people can test it. */
431 #ifdef DEFAULT_CALLER_SAVES
432 int flag_caller_saves = 1;
434 int flag_caller_saves = 0;
437 /* Nonzero if structures and unions should be returned in memory.
439 This should only be defined if compatibility with another compiler or
440 with an ABI is needed, because it results in slower code. */
442 #ifndef DEFAULT_PCC_STRUCT_RETURN
443 #define DEFAULT_PCC_STRUCT_RETURN 1
446 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
448 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
450 /* Nonzero for -fforce-mem: load memory value into a register
451 before arithmetic on it. This makes better cse but slower compilation. */
453 int flag_force_mem = 0;
455 /* Nonzero for -fforce-addr: load memory address into a register before
456 reference to memory. This makes better cse but slower compilation. */
458 int flag_force_addr = 0;
460 /* Nonzero for -fdefer-pop: don't pop args after each function call;
461 instead save them up to pop many calls' args with one insns. */
463 int flag_defer_pop = 0;
465 /* Nonzero for -ffloat-store: don't allocate floats and doubles
466 in extended-precision registers. */
468 int flag_float_store = 0;
470 /* Nonzero for -fcse-follow-jumps:
471 have cse follow jumps to do a more extensive job. */
473 int flag_cse_follow_jumps;
475 /* Nonzero for -fcse-skip-blocks:
476 have cse follow a branch around a block. */
477 int flag_cse_skip_blocks;
479 /* Nonzero for -fexpensive-optimizations:
480 perform miscellaneous relatively-expensive optimizations. */
481 int flag_expensive_optimizations;
483 /* Nonzero for -fthread-jumps:
484 have jump optimize output of loop. */
486 int flag_thread_jumps;
488 /* Nonzero enables strength-reduction in loop.c. */
490 int flag_strength_reduce = 0;
492 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
493 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
494 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
497 int flag_unroll_loops;
499 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
500 This is generally not a win. */
502 int flag_unroll_all_loops;
504 /* Nonzero enables prefetch optimizations for arrays in loops. */
506 int flag_prefetch_loop_arrays;
508 /* Nonzero forces all invariant computations in loops to be moved
511 int flag_move_all_movables = 0;
513 /* Nonzero forces all general induction variables in loops to be
516 int flag_reduce_all_givs = 0;
518 /* Nonzero to perform full register move optimization passes. This is the
521 int flag_regmove = 0;
523 /* Nonzero for -fwritable-strings:
524 store string constants in data segment and don't uniquize them. */
526 int flag_writable_strings = 0;
528 /* Nonzero means don't put addresses of constant functions in registers.
529 Used for compiling the Unix kernel, where strange substitutions are
530 done on the assembly output. */
532 int flag_no_function_cse = 0;
534 /* Nonzero for -fomit-frame-pointer:
535 don't make a frame pointer in simple functions that don't require one. */
537 int flag_omit_frame_pointer = 0;
539 /* Nonzero means place each function into its own section on those platforms
540 which support arbitrary section names and unlimited numbers of sections. */
542 int flag_function_sections = 0;
544 /* ... and similar for data. */
546 int flag_data_sections = 0;
548 /* Nonzero to inhibit use of define_optimization peephole opts. */
550 int flag_no_peephole = 0;
552 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
554 int flag_optimize_sibling_calls = 0;
556 /* Nonzero means the front end generally wants `errno' maintained by math
557 operations, like built-in SQRT. */
559 int flag_errno_math = 1;
561 /* Nonzero means that unsafe floating-point math optimizations are allowed
562 for the sake of speed. IEEE compliance is not guaranteed, and operations
563 are allowed to assume that their arguments and results are "normal"
564 (e.g., nonnegative for SQRT). */
566 int flag_unsafe_math_optimizations = 0;
568 /* Zero means that floating-point math operations cannot generate a
569 (user-visible) trap. This is the case, for example, in nonstop
570 IEEE 754 arithmetic. */
572 int flag_trapping_math = 1;
574 /* 0 means straightforward implementation of complex divide acceptable.
575 1 means wide ranges of inputs must work for complex divide.
576 2 means C99-like requirements for complex divide (not yet implemented). */
578 int flag_complex_divide_method = 0;
580 /* Nonzero means all references through pointers are volatile. */
584 /* Nonzero means treat all global and extern variables as volatile. */
586 int flag_volatile_global;
588 /* Nonzero means treat all static variables as volatile. */
590 int flag_volatile_static;
592 /* Nonzero means just do syntax checking; don't output anything. */
594 int flag_syntax_only = 0;
596 /* Nonzero means perform global cse. */
598 static int flag_gcse;
600 /* Nonzero means perform loop optimizer. */
602 static int flag_loop_optimize;
604 /* Nonzero means perform crossjumping. */
606 static int flag_crossjumping;
608 /* Nonzero means perform if conversion. */
610 static int flag_if_conversion;
612 /* Nonzero means perform if conversion after reload. */
614 static int flag_if_conversion2;
616 /* Nonzero means to use global dataflow analysis to eliminate
617 useless null pointer tests. */
619 static int flag_delete_null_pointer_checks;
621 /* Nonzero means to do the enhanced load motion during gcse, which trys
622 to hoist loads by not killing them when a store to the same location
625 int flag_gcse_lm = 1;
627 /* Nonzero means to perform store motion after gcse, which will try to
628 move stores closer to the exit block. Its not very effective without
631 int flag_gcse_sm = 1;
633 /* Nonzero means to rerun cse after loop optimization. This increases
634 compilation time about 20% and picks up a few more common expressions. */
636 static int flag_rerun_cse_after_loop;
638 /* Nonzero means to run loop optimizations twice. */
640 int flag_rerun_loop_opt;
642 /* Nonzero for -finline-functions: ok to inline functions that look like
643 good inline candidates. */
645 int flag_inline_functions;
647 /* Nonzero for -fkeep-inline-functions: even if we make a function
648 go inline everywhere, keep its definition around for debugging
651 int flag_keep_inline_functions;
653 /* Nonzero means that functions will not be inlined. */
655 int flag_no_inline = 2;
657 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
658 not just because the tree inliner turned us off. */
660 int flag_really_no_inline = 2;
662 /* Nonzero means that we should emit static const variables
663 regardless of whether or not optimization is turned on. */
665 int flag_keep_static_consts = 1;
667 /* Nonzero means we should be saving declaration info into a .X file. */
669 int flag_gen_aux_info = 0;
671 /* Specified name of aux-info file. */
673 static char *aux_info_file_name;
675 /* Nonzero means make the text shared if supported. */
677 int flag_shared_data;
679 /* Nonzero means schedule into delayed branch slots if supported. */
681 int flag_delayed_branch;
683 /* Nonzero if we are compiling pure (sharable) code.
684 Value is 1 if we are doing reasonable (i.e. simple
685 offset into offset table) pic. Value is 2 if we can
686 only perform register offsets. */
690 /* Nonzero means generate extra code for exception handling and enable
691 exception handling. */
695 /* Nonzero means generate frame unwind info table when supported. */
697 int flag_unwind_tables = 0;
699 /* Nonzero means generate frame unwind info table exact at each insn boundary */
701 int flag_asynchronous_unwind_tables = 0;
703 /* Nonzero means don't place uninitialized global data in common storage
708 /* Nonzero means change certain warnings into errors.
709 Usually these are warnings about failure to conform to some standard. */
711 int flag_pedantic_errors = 0;
713 /* flag_schedule_insns means schedule insns within basic blocks (before
715 flag_schedule_insns_after_reload means schedule insns after
718 int flag_schedule_insns = 0;
719 int flag_schedule_insns_after_reload = 0;
721 /* The following flags have effect only for scheduling before register
724 flag_schedule_interblock means schedule insns accross basic blocks.
725 flag_schedule_speculative means allow speculative motion of non-load insns.
726 flag_schedule_speculative_load means allow speculative motion of some
728 flag_schedule_speculative_load_dangerous allows speculative motion of more
731 int flag_schedule_interblock = 1;
732 int flag_schedule_speculative = 1;
733 int flag_schedule_speculative_load = 0;
734 int flag_schedule_speculative_load_dangerous = 0;
736 int flag_single_precision_constant;
738 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
739 by a cheaper branch on a count register. */
740 int flag_branch_on_count_reg = 1;
742 /* -finhibit-size-directive inhibits output of .size for ELF.
743 This is used only for compiling crtstuff.c,
744 and it may be extended to other effects
745 needed for crtstuff.c on other systems. */
746 int flag_inhibit_size_directive = 0;
748 /* -fverbose-asm causes extra commentary information to be produced in
749 the generated assembly code (to make it more readable). This option
750 is generally only of use to those who actually need to read the
751 generated assembly code (perhaps while debugging the compiler itself).
752 -fno-verbose-asm, the default, causes the extra information
753 to be omitted and is useful when comparing two assembler files. */
755 int flag_verbose_asm = 0;
757 /* -dA causes debug 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 Currently, this switch is only used by dwarfout.c; however, it is intended
762 to be a catchall for printing debug information in the assembler file. */
764 int flag_debug_asm = 0;
766 /* -dP causes the rtl to be emitted as a comment in assembly. */
768 int flag_dump_rtl_in_asm = 0;
770 /* -fgnu-linker specifies use of the GNU linker for initializations.
771 (Or, more generally, a linker that handles initializations.)
772 -fno-gnu-linker says that collect2 will be used. */
774 int flag_gnu_linker = 0;
776 int flag_gnu_linker = 1;
779 /* Nonzero means put zero initialized data in the bss section. */
780 int flag_zero_initialized_in_bss = 1;
785 /* Enable ssa conditional constant propagation. */
786 int flag_ssa_ccp = 0;
788 /* Enable ssa aggressive dead code elimination. */
789 int flag_ssa_dce = 0;
791 /* Tag all structures with __attribute__(packed). */
792 int flag_pack_struct = 0;
794 /* Emit code to check for stack overflow; also may cause large objects
795 to be allocated dynamically. */
796 int flag_stack_check;
798 /* When non-NULL, indicates that whenever space is allocated on the
799 stack, the resulting stack pointer must not pass this
800 address---that is, for stacks that grow downward, the stack pointer
801 must always be greater than or equal to this address; for stacks
802 that grow upward, the stack pointer must be less than this address.
803 At present, the rtx may be either a REG or a SYMBOL_REF, although
804 the support provided depends on the backend. */
807 /* 0 if pointer arguments may alias each other. True in C.
808 1 if pointer arguments may not alias each other but may alias
810 2 if pointer arguments may not alias each other and may not
811 alias global variables. True in Fortran.
812 This defaults to 0 for C. */
813 int flag_argument_noalias = 0;
815 /* Nonzero if we should do (language-dependent) alias analysis.
816 Typically, this analysis will assume that expressions of certain
817 types do not alias expressions of certain other types. Only used
818 if alias analysis (in general) is enabled. */
819 int flag_strict_aliasing = 0;
821 /* Instrument functions with calls at entry and exit, for profiling. */
822 int flag_instrument_function_entry_exit = 0;
824 /* Nonzero means ignore `#ident' directives. 0 means handle them.
825 On SVR4 targets, it also controls whether or not to emit a
826 string identifying the compiler. */
828 int flag_no_ident = 0;
830 /* This will perform a peephole pass before sched2. */
831 int flag_peephole2 = 0;
833 /* This will try to guess branch probabilities. */
834 int flag_guess_branch_prob = 0;
836 /* -fbounded-pointers causes gcc to compile pointers as composite
837 objects occupying three words: the pointer value, the base address
838 of the referent object, and the address immediately beyond the end
839 of the referent object. The base and extent allow us to perform
840 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
841 int flag_bounded_pointers = 0;
843 /* -fcheck-bounds causes gcc to generate array bounds checks.
844 For C, C++: defaults to value of flag_bounded_pointers.
845 For ObjC: defaults to off.
846 For Java: defaults to on.
847 For Fortran: defaults to off.
848 For CHILL: defaults to off. */
849 int flag_bounds_check = 0;
851 /* This will attempt to merge constant section constants, if 1 only
852 string constants and constants from constant pool, if 2 also constant
854 int flag_merge_constants = 1;
856 /* If one, renumber instruction UIDs to reduce the number of
857 unused UIDs if there are a lot of instructions. If greater than
858 one, unconditionally renumber instruction UIDs. */
859 int flag_renumber_insns = 1;
861 /* Values of the -falign-* flags: how much to align labels in code.
862 0 means `use default', 1 means `don't align'.
863 For each variable, there is an _log variant which is the power
864 of two not less than the variable, for .align output. */
868 int align_loops_max_skip;
871 int align_jumps_max_skip;
873 int align_labels_log;
874 int align_labels_max_skip;
876 int align_functions_log;
878 /* Table of supported debugging formats. */
881 const char *const arg;
882 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
883 constant expression, we use NO_DEBUG in its place. */
884 const enum debug_info_type debug_type;
885 const int use_extensions_p;
886 const char *const description;
890 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
891 N_("Generate debugging info in default format") },
892 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
893 #ifdef DBX_DEBUGGING_INFO
894 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
895 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
897 #ifdef DWARF_DEBUGGING_INFO
898 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
899 { "dwarf+", DWARF_DEBUG, 1,
900 N_("Generate extended DWARF-1 format debug info") },
902 #ifdef DWARF2_DEBUGGING_INFO
903 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
905 #ifdef XCOFF_DEBUGGING_INFO
906 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
907 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
909 #ifdef SDB_DEBUGGING_INFO
910 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
912 #ifdef VMS_DEBUGGING_INFO
913 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
920 const char *const string;
923 const char *const description;
925 lang_independent_options;
929 /* Add or remove a leading underscore from user symbols. */
930 int flag_leading_underscore = -1;
932 /* The user symbol prefix after having resolved same. */
933 const char *user_label_prefix;
935 static const param_info lang_independent_params[] = {
936 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
937 { OPTION, DEFAULT, HELP },
938 #include "params.def"
943 /* A default for same. */
944 #ifndef USER_LABEL_PREFIX
945 #define USER_LABEL_PREFIX ""
948 /* Table of language-independent -f options.
949 STRING is the option name. VARIABLE is the address of the variable.
950 ON_VALUE is the value to store in VARIABLE
951 if `-fSTRING' is seen as an option.
952 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
954 static const lang_independent_options f_options[] =
956 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
957 N_("Perform DWARF2 duplicate elimination") },
958 {"float-store", &flag_float_store, 1,
959 N_("Do not store floats in registers") },
960 {"volatile", &flag_volatile, 1,
961 N_("Consider all mem refs through pointers as volatile") },
962 {"volatile-global", &flag_volatile_global, 1,
963 N_("Consider all mem refs to global data to be volatile") },
964 {"volatile-static", &flag_volatile_static, 1,
965 N_("Consider all mem refs to static data to be volatile") },
966 {"defer-pop", &flag_defer_pop, 1,
967 N_("Defer popping functions args from stack until later") },
968 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
969 N_("When possible do not generate stack frames") },
970 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
971 N_("Optimize sibling and tail recursive calls") },
972 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
973 N_("When running CSE, follow jumps to their targets") },
974 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
975 N_("When running CSE, follow conditional jumps") },
976 {"expensive-optimizations", &flag_expensive_optimizations, 1,
977 N_("Perform a number of minor, expensive optimizations") },
978 {"thread-jumps", &flag_thread_jumps, 1,
979 N_("Perform jump threading optimizations") },
980 {"strength-reduce", &flag_strength_reduce, 1,
981 N_("Perform strength reduction optimizations") },
982 {"unroll-loops", &flag_unroll_loops, 1,
983 N_("Perform loop unrolling when iteration count is known") },
984 {"unroll-all-loops", &flag_unroll_all_loops, 1,
985 N_("Perform loop unrolling for all loops") },
986 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
987 N_("Generate prefetch instructions, if available, for arrays in loops") },
988 {"move-all-movables", &flag_move_all_movables, 1,
989 N_("Force all loop invariant computations out of loops") },
990 {"reduce-all-givs", &flag_reduce_all_givs, 1,
991 N_("Strength reduce all loop general induction variables") },
992 {"writable-strings", &flag_writable_strings, 1,
993 N_("Store strings in writable data section") },
994 {"peephole", &flag_no_peephole, 0,
995 N_("Enable machine specific peephole optimizations") },
996 {"force-mem", &flag_force_mem, 1,
997 N_("Copy memory operands into registers before using") },
998 {"force-addr", &flag_force_addr, 1,
999 N_("Copy memory address constants into regs before using") },
1000 {"function-cse", &flag_no_function_cse, 0,
1001 N_("Allow function addresses to be held in registers") },
1002 {"inline-functions", &flag_inline_functions, 1,
1003 N_("Integrate simple functions into their callers") },
1004 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1005 N_("Generate code for funcs even if they are fully inlined") },
1006 {"inline", &flag_no_inline, 0,
1007 N_("Pay attention to the 'inline' keyword") },
1008 {"keep-static-consts", &flag_keep_static_consts, 1,
1009 N_("Emit static const variables even if they are not used") },
1010 {"syntax-only", &flag_syntax_only, 1,
1011 N_("Check for syntax errors, then stop") },
1012 {"shared-data", &flag_shared_data, 1,
1013 N_("Mark data as shared rather than private") },
1014 {"caller-saves", &flag_caller_saves, 1,
1015 N_("Enable saving registers around function calls") },
1016 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1017 N_("Return 'short' aggregates in memory, not registers") },
1018 {"reg-struct-return", &flag_pcc_struct_return, 0,
1019 N_("Return 'short' aggregates in registers") },
1020 {"delayed-branch", &flag_delayed_branch, 1,
1021 N_("Attempt to fill delay slots of branch instructions") },
1022 {"gcse", &flag_gcse, 1,
1023 N_("Perform the global common subexpression elimination") },
1024 {"gcse-lm", &flag_gcse_lm, 1,
1025 N_("Perform enhanced load motion during global subexpression elimination") },
1026 {"gcse-sm", &flag_gcse_sm, 1,
1027 N_("Perform store motion after global subexpression elimination") },
1028 {"loop-optimize", &flag_loop_optimize, 1,
1029 N_("Perform the loop optimizations") },
1030 {"crossjumping", &flag_crossjumping, 1,
1031 N_("Perform cross-jumping optimization") },
1032 {"if-conversion", &flag_if_conversion, 1,
1033 N_("Perform conversion of conditional jumps to branchless equivalents") },
1034 {"if-conversion2", &flag_if_conversion2, 1,
1035 N_("Perform conversion of conditional jumps to conditional execution") },
1036 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1037 N_("Run CSE pass after loop optimizations") },
1038 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1039 N_("Run the loop optimizer twice") },
1040 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1041 N_("Delete useless null pointer checks") },
1042 {"schedule-insns", &flag_schedule_insns, 1,
1043 N_("Reschedule instructions before register allocation") },
1044 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1045 N_("Reschedule instructions after register allocation") },
1046 {"sched-interblock",&flag_schedule_interblock, 1,
1047 N_("Enable scheduling across basic blocks") },
1048 {"sched-spec",&flag_schedule_speculative, 1,
1049 N_("Allow speculative motion of non-loads") },
1050 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1051 N_("Allow speculative motion of some loads") },
1052 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1053 N_("Allow speculative motion of more loads") },
1054 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1055 N_("Replace add,compare,branch with branch on count reg") },
1056 {"pic", &flag_pic, 1,
1057 N_("Generate position independent code, if possible") },
1058 {"PIC", &flag_pic, 2, ""},
1059 {"exceptions", &flag_exceptions, 1,
1060 N_("Enable exception handling") },
1061 {"unwind-tables", &flag_unwind_tables, 1,
1062 N_("Just generate unwind tables for exception handling") },
1063 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1064 N_("Generate unwind tables exact at each instruction boundary") },
1065 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1066 N_("Support synchronous non-call exceptions") },
1067 {"profile-arcs", &profile_arc_flag, 1,
1068 N_("Insert arc based program profiling code") },
1069 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs, 1,
1070 N_("Avoid thread safety profiling overhead") },
1071 {"test-coverage", &flag_test_coverage, 1,
1072 N_("Create data files needed by gcov") },
1073 {"branch-probabilities", &flag_branch_probabilities, 1,
1074 N_("Use profiling information for branch probabilities") },
1075 {"profile", &profile_flag, 1,
1076 N_("Enable basic program profiling code") },
1077 {"reorder-blocks", &flag_reorder_blocks, 1,
1078 N_("Reorder basic blocks to improve code placement") },
1079 {"rename-registers", &flag_rename_registers, 1,
1080 N_("Do the register renaming optimization pass") },
1081 {"cprop-registers", &flag_cprop_registers, 1,
1082 N_("Do the register copy-propagation optimization pass") },
1083 {"common", &flag_no_common, 0,
1084 N_("Do not put uninitialized globals in the common section") },
1085 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1086 N_("Do not generate .size directives") },
1087 {"function-sections", &flag_function_sections, 1,
1088 N_("place each function into its own section") },
1089 {"data-sections", &flag_data_sections, 1,
1090 N_("place data items into their own section") },
1091 {"verbose-asm", &flag_verbose_asm, 1,
1092 N_("Add extra commentry to assembler output") },
1093 {"gnu-linker", &flag_gnu_linker, 1,
1094 N_("Output GNU ld formatted global initializers") },
1095 {"regmove", &flag_regmove, 1,
1096 N_("Enables a register move optimization") },
1097 {"optimize-register-move", &flag_regmove, 1,
1098 N_("Do the full regmove optimization pass") },
1099 {"pack-struct", &flag_pack_struct, 1,
1100 N_("Pack structure members together without holes") },
1101 {"stack-check", &flag_stack_check, 1,
1102 N_("Insert stack checking code into the program") },
1103 {"argument-alias", &flag_argument_noalias, 0,
1104 N_("Specify that arguments may alias each other & globals") },
1105 {"argument-noalias", &flag_argument_noalias, 1,
1106 N_("Assume arguments may alias globals but not each other") },
1107 {"argument-noalias-global", &flag_argument_noalias, 2,
1108 N_("Assume arguments do not alias each other or globals") },
1109 {"strict-aliasing", &flag_strict_aliasing, 1,
1110 N_("Assume strict aliasing rules apply") },
1111 {"align-loops", &align_loops, 0,
1112 N_("Align the start of loops") },
1113 {"align-jumps", &align_jumps, 0,
1114 N_("Align labels which are only reached by jumping") },
1115 {"align-labels", &align_labels, 0,
1116 N_("Align all labels") },
1117 {"align-functions", &align_functions, 0,
1118 N_("Align the start of functions") },
1119 {"merge-constants", &flag_merge_constants, 1,
1120 N_("Attempt to merge identical constants accross compilation units") },
1121 {"merge-all-constants", &flag_merge_constants, 2,
1122 N_("Attempt to merge identical constants and constant variables") },
1123 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1124 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1125 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1126 N_("Instrument function entry/exit with profiling calls") },
1127 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1128 N_("Put zero initialized data in the bss section") },
1129 {"ssa", &flag_ssa, 1,
1130 N_("Enable SSA optimizations") },
1131 {"ssa-ccp", &flag_ssa_ccp, 1,
1132 N_("Enable SSA conditional constant propagation") },
1133 {"ssa-dce", &flag_ssa_dce, 1,
1134 N_("Enable aggressive SSA dead code elimination") },
1135 {"leading-underscore", &flag_leading_underscore, 1,
1136 N_("External symbols have a leading underscore") },
1137 {"ident", &flag_no_ident, 0,
1138 N_("Process #ident directives") },
1139 { "peephole2", &flag_peephole2, 1,
1140 N_("Enables an rtl peephole pass run before sched2") },
1141 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1142 N_("Enables guessing of branch probabilities") },
1143 {"math-errno", &flag_errno_math, 1,
1144 N_("Set errno after built-in math functions") },
1145 {"trapping-math", &flag_trapping_math, 1,
1146 N_("Floating-point operations can trap") },
1147 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1148 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1149 {"bounded-pointers", &flag_bounded_pointers, 1,
1150 N_("Compile pointers as triples: value, base & end") },
1151 {"bounds-check", &flag_bounds_check, 1,
1152 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1153 {"single-precision-constant", &flag_single_precision_constant, 1,
1154 N_("Convert floating point constant to single precision constant") },
1155 {"time-report", &time_report, 1,
1156 N_("Report time taken by each compiler pass at end of run") },
1157 {"mem-report", &mem_report, 1,
1158 N_("Report on permanent memory allocation at end of run") },
1159 { "trapv", &flag_trapv, 1,
1160 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1163 /* Table of language-specific options. */
1165 static const struct lang_opt
1167 const char *const option;
1168 const char *const description;
1170 documented_lang_options[] =
1172 /* In order not to overload the --help output, the convention
1173 used here is to only describe those options which are not
1174 enabled by default. */
1177 N_("Compile just for ISO C89") },
1179 N_("Determine language standard") },
1181 { "-fsigned-bitfields", "" },
1182 { "-funsigned-bitfields",
1183 N_("Make bit-fields by unsigned by default") },
1184 { "-fno-signed-bitfields", "" },
1185 { "-fno-unsigned-bitfields","" },
1187 N_("Make 'char' be signed by default") },
1188 { "-funsigned-char",
1189 N_("Make 'char' be unsigned by default") },
1190 { "-fno-signed-char", "" },
1191 { "-fno-unsigned-char", "" },
1195 N_("Do not recognize the 'asm' keyword") },
1196 { "-fbuiltin", "" },
1198 N_("Do not recognize any built in functions") },
1200 N_("Assume normal C execution environment") },
1201 { "-fno-hosted", "" },
1203 N_("Assume that standard libraries & main might not exist") },
1204 { "-fno-freestanding", "" },
1205 { "-fcond-mismatch",
1206 N_("Allow different types as args of ? operator") },
1207 { "-fno-cond-mismatch", "" },
1208 { "-fdollars-in-identifiers",
1209 N_("Allow the use of $ inside identifiers") },
1210 { "-fno-dollars-in-identifiers", "" },
1211 { "-fpreprocessed", "" },
1212 { "-fno-preprocessed", "" },
1214 N_("Use the same size for double as for float") },
1215 { "-fno-short-double", "" },
1217 N_("Use the smallest fitting integer to hold enums") },
1218 { "-fno-short-enums", "" },
1220 N_("Override the underlying type for wchar_t to `unsigned short'") },
1221 { "-fno-short-wchar", "" },
1224 N_("Enable most warning messages") },
1225 { "-Wbad-function-cast",
1226 N_("Warn about casting functions to incompatible types") },
1227 { "-Wno-bad-function-cast", "" },
1228 { "-Wmissing-format-attribute",
1229 N_("Warn about functions which might be candidates for format attributes") },
1230 { "-Wno-missing-format-attribute", "" },
1232 N_("Warn about casts which discard qualifiers") },
1233 { "-Wno-cast-qual", "" },
1234 { "-Wchar-subscripts",
1235 N_("Warn about subscripts whose type is 'char'") },
1236 { "-Wno-char-subscripts", "" },
1238 N_("Warn if nested comments are detected") },
1239 { "-Wno-comment", "" },
1241 N_("Warn if nested comments are detected") },
1242 { "-Wno-comments", "" },
1244 N_("Warn about possibly confusing type conversions") },
1245 { "-Wno-conversion", "" },
1246 { "-Wdiv-by-zero", "" },
1247 { "-Wno-div-by-zero",
1248 N_("Do not warn about compile-time integer division by zero") },
1250 N_("Warn about testing equality of floating point numbers") },
1251 { "-Wno-float-equal", "" },
1253 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1254 { "-Wno-format", "" },
1255 { "-Wformat-extra-args", "" },
1256 { "-Wno-format-extra-args",
1257 N_("Don't warn about too many arguments to format functions") },
1258 { "-Wformat-nonliteral",
1259 N_("Warn about non-string-literal format strings") },
1260 { "-Wno-format-nonliteral", "" },
1261 { "-Wformat-security",
1262 N_("Warn about possible security problems with format functions") },
1263 { "-Wno-format-security", "" },
1264 { "-Wformat-y2k", "" },
1265 { "-Wno-format-y2k",
1266 N_("Don't warn about strftime formats yielding 2 digit years") },
1267 { "-Wimplicit-function-declaration",
1268 N_("Warn about implicit function declarations") },
1269 { "-Wno-implicit-function-declaration", "" },
1270 { "-Werror-implicit-function-declaration", "" },
1272 N_("Warn when a declaration does not specify a type") },
1273 { "-Wno-implicit-int", "" },
1274 { "-Wimplicit", "" },
1275 { "-Wno-implicit", "" },
1277 N_("Warn about the use of the #import directive") },
1278 { "-Wno-import", "" },
1279 { "-Wlong-long","" },
1281 N_("Do not warn about using 'long long' when -pedantic") },
1283 N_("Warn about suspicious declarations of main") },
1284 { "-Wno-main", "" },
1285 { "-Wmissing-braces",
1286 N_("Warn about possibly missing braces around initializers") },
1287 { "-Wno-missing-braces", "" },
1288 { "-Wmissing-declarations",
1289 N_("Warn about global funcs without previous declarations") },
1290 { "-Wno-missing-declarations", "" },
1291 { "-Wmissing-prototypes",
1292 N_("Warn about global funcs without prototypes") },
1293 { "-Wno-missing-prototypes", "" },
1295 N_("Warn about use of multicharacter literals") },
1296 { "-Wno-multichar", "" },
1297 { "-Wnested-externs",
1298 N_("Warn about externs not at file scope level") },
1299 { "-Wno-nested-externs", "" },
1301 N_("Warn about possible missing parentheses") },
1302 { "-Wno-parentheses", "" },
1303 { "-Wpointer-arith",
1304 N_("Warn about function pointer arithmetic") },
1305 { "-Wno-pointer-arith", "" },
1306 { "-Wredundant-decls",
1307 N_("Warn about multiple declarations of the same object") },
1308 { "-Wno-redundant-decls", "" },
1310 N_("Warn whenever a function's return-type defaults to int") },
1311 { "-Wno-return-type", "" },
1312 { "-Wsequence-point",
1313 N_("Warn about possible violations of sequence point rules") },
1314 { "-Wno-sequence-point", "" },
1316 N_("Warn about signed/unsigned comparisons") },
1317 { "-Wno-sign-compare", "" },
1318 { "-Wstrict-prototypes",
1319 N_("Warn about non-prototyped function decls") },
1320 { "-Wno-strict-prototypes", "" },
1322 N_("Warn about constructs whose meanings change in ISO C") },
1323 { "-Wno-traditional", "" },
1325 N_("Warn when trigraphs are encountered") },
1326 { "-Wno-trigraphs", "" },
1328 { "-Wno-undef", "" },
1329 { "-Wunknown-pragmas",
1330 N_("Warn about unrecognized pragmas") },
1331 { "-Wno-unknown-pragmas", "" },
1332 { "-Wwrite-strings",
1333 N_("Mark strings as 'const char *'") },
1334 { "-Wno-write-strings", "" },
1336 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1338 #include "options.h"
1342 /* Here is a table, controlled by the tm.h file, listing each -m switch
1343 and which bits in `target_switches' it should set or clear.
1344 If VALUE is positive, it is bits to set.
1345 If VALUE is negative, -VALUE is bits to clear.
1346 (The sign bit is not used so there is no confusion.) */
1350 const char *const name;
1352 const char *const description;
1354 target_switches[] = TARGET_SWITCHES;
1356 /* This table is similar, but allows the switch to have a value. */
1358 #ifdef TARGET_OPTIONS
1361 const char *const prefix;
1362 const char **const variable;
1363 const char *const description;
1365 target_options[] = TARGET_OPTIONS;
1368 /* Options controlling warnings. */
1370 /* Don't print warning messages. -w. */
1372 int inhibit_warnings = 0;
1374 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1376 int warn_system_headers = 0;
1378 /* Print various extra warnings. -W. */
1380 int extra_warnings = 0;
1382 /* Treat warnings as errors. -Werror. */
1384 int warnings_are_errors = 0;
1386 /* Nonzero to warn about unused variables, functions et.al. */
1388 int warn_unused_function;
1389 int warn_unused_label;
1390 int warn_unused_parameter;
1391 int warn_unused_variable;
1392 int warn_unused_value;
1394 /* Nonzero to warn about code which is never reached. */
1396 int warn_notreached;
1398 /* Nonzero to warn about variables used before they are initialized. */
1400 int warn_uninitialized;
1402 /* Nonzero means warn about all declarations which shadow others. */
1406 /* Warn if a switch on an enum, that does not have a default case,
1407 fails to have a case for every enum value. */
1411 /* Warn if a switch does not have a default case. */
1413 int warn_switch_default;
1415 /* Warn if a switch on an enum fails to have a case for every enum
1416 value (regardless of the presence or otherwise of a default case). */
1418 int warn_switch_enum;
1420 /* Nonzero means warn about function definitions that default the return type
1421 or that use a null return and have a return-type other than void. */
1423 int warn_return_type;
1425 /* Nonzero means warn about pointer casts that increase the required
1426 alignment of the target type (and might therefore lead to a crash
1427 due to a misaligned access). */
1429 int warn_cast_align;
1431 /* Nonzero means warn about any objects definitions whose size is larger
1432 than N bytes. Also want about function definitions whose returned
1433 values are larger than N bytes. The value N is in `larger_than_size'. */
1435 int warn_larger_than;
1436 HOST_WIDE_INT larger_than_size;
1438 /* Nonzero means warn if inline function is too large. */
1442 /* Warn if a function returns an aggregate,
1443 since there are often incompatible calling conventions for doing this. */
1445 int warn_aggregate_return;
1447 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1451 /* Warn when gcc pads a structure to an alignment boundary. */
1455 /* Warn when an optimization pass is disabled. */
1457 int warn_disabled_optimization;
1459 /* Warn about functions which might be candidates for attribute noreturn. */
1461 int warn_missing_noreturn;
1463 /* Nonzero means warn about uses of __attribute__((deprecated))
1466 int warn_deprecated_decl = 1;
1468 /* Likewise for -W. */
1470 static const lang_independent_options W_options[] =
1472 {"unused-function", &warn_unused_function, 1,
1473 N_("Warn when a function is unused") },
1474 {"unused-label", &warn_unused_label, 1,
1475 N_("Warn when a label is unused") },
1476 {"unused-parameter", &warn_unused_parameter, 1,
1477 N_("Warn when a function parameter is unused") },
1478 {"unused-variable", &warn_unused_variable, 1,
1479 N_("Warn when a variable is unused") },
1480 {"unused-value", &warn_unused_value, 1,
1481 N_("Warn when an expression value is unused") },
1482 {"system-headers", &warn_system_headers, 1,
1483 N_("Do not suppress warnings from system headers") },
1484 {"error", &warnings_are_errors, 1,
1485 N_("Treat all warnings as errors") },
1486 {"shadow", &warn_shadow, 1,
1487 N_("Warn when one local variable shadows another") },
1488 {"switch", &warn_switch, 1,
1489 N_("Warn about enumerated switches, with no default, missing a case") },
1490 {"switch-default", &warn_switch_default, 1,
1491 N_("Warn about enumerated switches missing a default case") },
1492 {"switch-enum", &warn_switch_enum, 1,
1493 N_("Warn about all enumerated switches missing a specific case") },
1494 {"aggregate-return", &warn_aggregate_return, 1,
1495 N_("Warn about returning structures, unions or arrays") },
1496 {"cast-align", &warn_cast_align, 1,
1497 N_("Warn about pointer casts which increase alignment") },
1498 {"unreachable-code", &warn_notreached, 1,
1499 N_("Warn about code that will never be executed") },
1500 {"uninitialized", &warn_uninitialized, 1,
1501 N_("Warn about uninitialized automatic variables") },
1502 {"inline", &warn_inline, 1,
1503 N_("Warn when an inlined function cannot be inlined") },
1504 {"packed", &warn_packed, 1,
1505 N_("Warn when the packed attribute has no effect on struct layout") },
1506 {"padded", &warn_padded, 1,
1507 N_("Warn when padding is required to align struct members") },
1508 {"disabled-optimization", &warn_disabled_optimization, 1,
1509 N_("Warn when an optimization pass is disabled") },
1510 {"deprecated-declarations", &warn_deprecated_decl, 1,
1511 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1512 {"missing-noreturn", &warn_missing_noreturn, 1,
1513 N_("Warn about functions which might be candidates for attribute noreturn") }
1517 set_Wunused (setting)
1520 warn_unused_function = setting;
1521 warn_unused_label = setting;
1522 /* Unused function parameter warnings are reported when either ``-W
1523 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1524 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1526 warn_unused_parameter = 0;
1527 else if (!warn_unused_parameter)
1528 warn_unused_parameter = -1;
1529 warn_unused_variable = setting;
1530 warn_unused_value = setting;
1533 /* The following routines are useful in setting all the flags that
1534 -ffast-math and -fno-fast-math imply. */
1537 set_fast_math_flags ()
1539 flag_trapping_math = 0;
1540 flag_unsafe_math_optimizations = 1;
1541 flag_errno_math = 0;
1545 set_no_fast_math_flags ()
1547 flag_trapping_math = 1;
1548 flag_unsafe_math_optimizations = 0;
1549 flag_errno_math = 1;
1553 /* Output files for assembler code (real compiler output)
1554 and debugging dumps. */
1557 FILE *aux_info_file;
1558 FILE *rtl_dump_file = NULL;
1560 /* Decode the string P as an integral parameter.
1561 If the string is indeed an integer return its numeric value else
1562 issue an Invalid Option error for the option PNAME and return DEFVAL.
1563 If PNAME is zero just return DEFVAL, do not call error. */
1566 read_integral_parameter (p, pname, defval)
1571 const char *endp = p;
1575 if (ISDIGIT (*endp))
1584 error ("invalid option `%s'", pname);
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 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1645 into ICE messages, which is much more user friendly. */
1648 crash_signal (signo)
1651 internal_error ("internal error: %s", strsignal (signo));
1654 /* Strip off a legitimate source ending from the input string NAME of
1655 length LEN. Rather than having to know the names used by all of
1656 our front ends, we strip off an ending of a period followed by
1657 up to five characters. (Java uses ".class".) */
1660 strip_off_ending (name, len)
1665 for (i = 2; i < 6 && len > i; i++)
1667 if (name[len - i] == '.')
1669 name[len - i] = '\0';
1675 /* Output a quoted string. */
1678 output_quoted_string (asm_file, string)
1682 #ifdef OUTPUT_QUOTED_STRING
1683 OUTPUT_QUOTED_STRING (asm_file, string);
1687 putc ('\"', asm_file);
1688 while ((c = *string++) != 0)
1692 if (c == '\"' || c == '\\')
1693 putc ('\\', asm_file);
1697 fprintf (asm_file, "\\%03o", c);
1699 putc ('\"', asm_file);
1703 /* Output a file name in the form wanted by System V. */
1706 output_file_directive (asm_file, input_name)
1708 const char *input_name;
1710 int len = strlen (input_name);
1711 const char *na = input_name + len;
1713 /* NA gets INPUT_NAME sans directory names. */
1714 while (na > input_name)
1716 if (IS_DIR_SEPARATOR (na[-1]))
1721 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1722 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1724 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1725 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1727 fprintf (asm_file, "\t.file\t");
1728 output_quoted_string (asm_file, na);
1729 fputc ('\n', asm_file);
1734 /* Routine to open a dump file. Return true if the dump file is enabled. */
1737 open_dump_file (index, decl)
1738 enum dump_file_index index;
1742 const char *open_arg;
1745 if (! dump_file[index].enabled)
1748 timevar_push (TV_DUMP);
1749 if (rtl_dump_file != NULL)
1750 fclose (rtl_dump_file);
1752 sprintf (seq, DUMPFILE_FORMAT, index);
1754 if (! dump_file[index].initialized)
1756 /* If we've not initialized the files, do so now. */
1757 if (graph_dump_format != no_graph
1758 && dump_file[index].graph_dump_p)
1760 dump_name = concat (seq, dump_file[index].extension, NULL);
1761 clean_graph_dump_file (dump_base_name, dump_name);
1764 dump_file[index].initialized = 1;
1770 dump_name = concat (dump_base_name, seq,
1771 dump_file[index].extension, NULL);
1773 rtl_dump_file = fopen (dump_name, open_arg);
1774 if (rtl_dump_file == NULL)
1775 fatal_io_error ("can't open %s", dump_name);
1780 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1781 (*lang_hooks.decl_printable_name) (decl, 2));
1783 timevar_pop (TV_DUMP);
1787 /* Routine to close a dump file. */
1790 close_dump_file (index, func, insns)
1791 enum dump_file_index index;
1792 void (*func) PARAMS ((FILE *, rtx));
1795 if (! rtl_dump_file)
1798 timevar_push (TV_DUMP);
1800 && graph_dump_format != no_graph
1801 && dump_file[index].graph_dump_p)
1806 sprintf (seq, DUMPFILE_FORMAT, index);
1807 suffix = concat (seq, dump_file[index].extension, NULL);
1808 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1813 func (rtl_dump_file, insns);
1815 fflush (rtl_dump_file);
1816 fclose (rtl_dump_file);
1818 rtl_dump_file = NULL;
1819 timevar_pop (TV_DUMP);
1822 /* Do any final processing required for the declarations in VEC, of
1823 which there are LEN. We write out inline functions and variables
1824 that have been deferred until this point, but which are required.
1825 Returns non-zero if anything was put out. */
1828 wrapup_global_declarations (vec, len)
1835 int output_something = 0;
1837 for (i = 0; i < len; i++)
1841 /* We're not deferring this any longer. */
1842 DECL_DEFER_OUTPUT (decl) = 0;
1844 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1845 (*lang_hooks.finish_incomplete_decl) (decl);
1848 /* Now emit any global variables or functions that we have been
1849 putting off. We need to loop in case one of the things emitted
1850 here references another one which comes earlier in the list. */
1854 for (i = 0; i < len; i++)
1858 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1861 /* Don't write out static consts, unless we still need them.
1863 We also keep static consts if not optimizing (for debugging),
1864 unless the user specified -fno-keep-static-consts.
1865 ??? They might be better written into the debug information.
1866 This is possible when using DWARF.
1868 A language processor that wants static constants to be always
1869 written out (even if it is not used) is responsible for
1870 calling rest_of_decl_compilation itself. E.g. the C front-end
1871 calls rest_of_decl_compilation from finish_decl.
1872 One motivation for this is that is conventional in some
1873 environments to write things like:
1874 static const char rcsid[] = "... version string ...";
1875 intending to force the string to be in the executable.
1877 A language processor that would prefer to have unneeded
1878 static constants "optimized away" would just defer writing
1879 them out until here. E.g. C++ does this, because static
1880 constants are often defined in header files.
1882 ??? A tempting alternative (for both C and C++) would be
1883 to force a constant to be written if and only if it is
1884 defined in a main file, as opposed to an include file. */
1886 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1890 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1892 else if (DECL_COMDAT (decl))
1894 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1895 && (optimize || !flag_keep_static_consts
1896 || DECL_ARTIFICIAL (decl)))
1902 rest_of_decl_compilation (decl, NULL, 1, 1);
1906 if (TREE_CODE (decl) == FUNCTION_DECL
1907 && DECL_INITIAL (decl) != 0
1908 && DECL_SAVED_INSNS (decl) != 0
1909 && (flag_keep_inline_functions
1910 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1911 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1914 output_inline_function (decl);
1919 output_something = 1;
1923 return output_something;
1926 /* Issue appropriate warnings for the global declarations in VEC (of
1927 which there are LEN). Output debugging information for them. */
1930 check_global_declarations (vec, len)
1937 for (i = 0; i < len; i++)
1941 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1942 && ! TREE_ASM_WRITTEN (decl))
1943 /* Cancel the RTL for this decl so that, if debugging info
1944 output for global variables is still to come,
1945 this one will be omitted. */
1946 SET_DECL_RTL (decl, NULL_RTX);
1948 /* Warn about any function
1949 declared static but not defined.
1950 We don't warn about variables,
1951 because many programs have static variables
1952 that exist only to get some text into the object file. */
1953 if (TREE_CODE (decl) == FUNCTION_DECL
1954 && (warn_unused_function
1955 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1956 && DECL_INITIAL (decl) == 0
1957 && DECL_EXTERNAL (decl)
1958 && ! DECL_ARTIFICIAL (decl)
1959 && ! TREE_PUBLIC (decl))
1961 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1962 pedwarn_with_decl (decl,
1963 "`%s' used but never defined");
1965 warning_with_decl (decl,
1966 "`%s' declared `static' but never defined");
1967 /* This symbol is effectively an "extern" declaration now. */
1968 TREE_PUBLIC (decl) = 1;
1969 assemble_external (decl);
1972 /* Warn about static fns or vars defined but not used. */
1973 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1974 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1975 && ! TREE_USED (decl)
1976 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1977 to handle multiple external decls in different scopes. */
1978 && ! TREE_USED (DECL_NAME (decl))
1979 && ! DECL_EXTERNAL (decl)
1980 && ! TREE_PUBLIC (decl)
1981 /* Global register variables must be declared to reserve them. */
1982 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1983 /* Otherwise, ask the language. */
1984 && (*lang_hooks.decls.warn_unused_global) (decl))
1985 warning_with_decl (decl, "`%s' defined but not used");
1987 timevar_push (TV_SYMOUT);
1988 (*debug_hooks->global_decl) (decl);
1989 timevar_pop (TV_SYMOUT);
1993 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
1994 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1995 INPUT_FILENAME and LINENO accordingly. */
1998 push_srcloc (file, line)
2002 struct file_stack *fs;
2004 if (input_file_stack)
2006 input_file_stack->name = input_filename;
2007 input_file_stack->line = lineno;
2010 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2011 fs->name = input_filename = file;
2012 fs->line = lineno = line;
2013 fs->indent_level = 0;
2014 fs->next = input_file_stack;
2015 input_file_stack = fs;
2016 input_file_stack_tick++;
2019 /* Pop the top entry off the stack of presently open source files.
2020 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2026 struct file_stack *fs;
2028 fs = input_file_stack;
2029 input_file_stack = fs->next;
2031 input_file_stack_tick++;
2032 /* The initial source file is never popped. */
2033 if (!input_file_stack)
2035 input_filename = input_file_stack->name;
2036 lineno = input_file_stack->line;
2039 /* Compile an entire translation unit. Write a file of assembly
2040 output and various debugging dumps. */
2047 /* Initialize yet another pass. */
2049 init_final (main_input_filename);
2050 init_branch_prob (dump_base_name);
2052 timevar_push (TV_PARSE);
2054 /* Call the parser, which parses the entire file (calling
2055 rest_of_compilation for each function). */
2056 (*lang_hooks.parse_file) (set_yydebug);
2058 /* In case there were missing block closers,
2059 get us back to the global binding level. */
2060 (*lang_hooks.clear_binding_stack) ();
2062 /* Compilation is now finished except for writing
2063 what's left of the symbol table output. */
2064 timevar_pop (TV_PARSE);
2066 if (flag_syntax_only)
2069 globals = (*lang_hooks.decls.getdecls) ();
2071 /* Really define vars that have had only a tentative definition.
2072 Really output inline functions that must actually be callable
2073 and have not been output so far. */
2076 int len = list_length (globals);
2077 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2081 /* Process the decls in reverse order--earliest first.
2082 Put them into VEC from back to front, then take out from front. */
2084 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2085 vec[len - i - 1] = decl;
2087 wrapup_global_declarations (vec, len);
2089 /* This must occur after the loop to output deferred functions. Else
2090 the profiler initializer would not be emitted if all the functions
2091 in this compilation unit were deferred.
2093 output_func_start_profiler can not cause any additional functions or
2094 data to need to be output, so it need not be in the deferred function
2096 output_func_start_profiler ();
2098 check_global_declarations (vec, len);
2104 /* Write out any pending weak symbol declarations. */
2108 /* Do dbx symbols. */
2109 timevar_push (TV_SYMOUT);
2111 #ifdef DWARF2_UNWIND_INFO
2112 if (dwarf2out_do_frame ())
2113 dwarf2out_frame_finish ();
2116 (*debug_hooks->finish) (main_input_filename);
2117 timevar_pop (TV_SYMOUT);
2119 /* Output some stuff at end of file if nec. */
2121 dw2_output_indirect_constants ();
2123 end_final (dump_base_name);
2125 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2127 timevar_push (TV_DUMP);
2128 open_dump_file (DFI_bp, NULL);
2132 close_dump_file (DFI_bp, NULL, NULL_RTX);
2133 timevar_pop (TV_DUMP);
2137 ASM_FILE_END (asm_out_file);
2140 /* Attach a special .ident directive to the end of the file to identify
2141 the version of GCC which compiled this code. The format of the .ident
2142 string is patterned after the ones produced by native SVR4 compilers. */
2145 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2146 IDENT_ASM_OP, version_string);
2149 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2151 timevar_push (TV_DUMP);
2152 dump_combine_total_stats (rtl_dump_file);
2153 close_dump_file (DFI_combine, NULL, NULL_RTX);
2154 timevar_pop (TV_DUMP);
2158 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2159 and TYPE_DECL nodes.
2161 This does nothing for local (non-static) variables, unless the
2162 variable is a register variable with an ASMSPEC. In that case, or
2163 if the variable is not an automatic, it sets up the RTL and
2164 outputs any assembler code (label definition, storage allocation
2165 and initialization).
2167 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2168 the assembler symbol name to be used. TOP_LEVEL is nonzero
2169 if this declaration is not within a function. */
2172 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2174 const char *asmspec;
2178 /* Declarations of variables, and of functions defined elsewhere. */
2180 /* The most obvious approach, to put an #ifndef around where
2181 this macro is used, doesn't work since it's inside a macro call. */
2182 #ifndef ASM_FINISH_DECLARE_OBJECT
2183 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2186 /* We deferred calling assemble_alias so that we could collect
2187 other attributes such as visibility. Emit the alias now. */
2190 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2193 alias = TREE_VALUE (TREE_VALUE (alias));
2194 alias = get_identifier (TREE_STRING_POINTER (alias));
2195 assemble_alias (decl, alias);
2199 /* Forward declarations for nested functions are not "external",
2200 but we need to treat them as if they were. */
2201 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2202 || TREE_CODE (decl) == FUNCTION_DECL)
2204 timevar_push (TV_VARCONST);
2207 make_decl_rtl (decl, asmspec);
2209 /* Don't output anything when a tentative file-scope definition
2210 is seen. But at end of compilation, do output code for them. */
2211 if (at_end || !DECL_DEFER_OUTPUT (decl))
2212 assemble_variable (decl, top_level, at_end, 0);
2213 if (decl == last_assemble_variable_decl)
2215 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2219 timevar_pop (TV_VARCONST);
2221 else if (DECL_REGISTER (decl) && asmspec != 0)
2223 if (decode_reg_name (asmspec) >= 0)
2225 SET_DECL_RTL (decl, NULL_RTX);
2226 make_decl_rtl (decl, asmspec);
2230 error ("invalid register name `%s' for register variable", asmspec);
2231 DECL_REGISTER (decl) = 0;
2236 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2237 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2238 && TREE_CODE (decl) == TYPE_DECL)
2240 timevar_push (TV_SYMOUT);
2241 dbxout_symbol (decl, 0);
2242 timevar_pop (TV_SYMOUT);
2245 #ifdef SDB_DEBUGGING_INFO
2246 else if (write_symbols == SDB_DEBUG && top_level
2247 && TREE_CODE (decl) == TYPE_DECL)
2249 timevar_push (TV_SYMOUT);
2250 sdbout_symbol (decl, 0);
2251 timevar_pop (TV_SYMOUT);
2256 /* Called after finishing a record, union or enumeral type. */
2259 rest_of_type_compilation (type, toplev)
2260 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2264 tree type ATTRIBUTE_UNUSED;
2265 int toplev ATTRIBUTE_UNUSED;
2268 timevar_push (TV_SYMOUT);
2269 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2270 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2271 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2273 #ifdef SDB_DEBUGGING_INFO
2274 if (write_symbols == SDB_DEBUG)
2275 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2277 #ifdef DWARF2_DEBUGGING_INFO
2278 if ((write_symbols == DWARF2_DEBUG
2279 || write_symbols == VMS_AND_DWARF2_DEBUG)
2281 dwarf2out_decl (TYPE_STUB_DECL (type));
2283 timevar_pop (TV_SYMOUT);
2286 /* This is called from finish_function (within langhooks.parse_file)
2287 after each top-level definition is parsed.
2288 It is supposed to compile that function or variable
2289 and output the assembler code for it.
2290 After we return, the tree storage is freed. */
2293 rest_of_compilation (decl)
2299 int rebuild_label_notes_after_reload;
2300 int register_life_up_to_date;
2302 timevar_push (TV_REST_OF_COMPILATION);
2304 /* Now that we're out of the frontend, we shouldn't have any more
2305 CONCATs anywhere. */
2306 generating_concat_p = 0;
2308 /* When processing delayed functions, prepare_function_start() won't
2309 have been run to re-initialize it. */
2310 cse_not_expected = ! optimize;
2312 /* First, make sure that NOTE_BLOCK is set correctly for each
2313 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2314 if (!cfun->x_whole_function_mode_p)
2317 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2318 tree in sensible shape. So, we just recalculate it here. */
2319 if (cfun->x_whole_function_mode_p)
2324 /* If we are reconsidering an inline function
2325 at the end of compilation, skip the stuff for making it inline. */
2327 if (DECL_SAVED_INSNS (decl) == 0)
2333 /* If this is nested inside an inlined external function, pretend
2334 it was only declared. Since we cannot inline such functions,
2335 generating code for this one is not only not necessary but will
2336 confuse some debugging output writers. */
2337 for (parent = DECL_CONTEXT (current_function_decl);
2338 parent != NULL_TREE;
2339 parent = get_containing_scope (parent))
2340 if (TREE_CODE (parent) == FUNCTION_DECL
2341 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2343 DECL_INITIAL (decl) = 0;
2344 goto exit_rest_of_compilation;
2347 /* If requested, consider whether to make this function inline. */
2348 if ((DECL_INLINE (decl) && !flag_no_inline)
2349 || flag_inline_functions)
2351 timevar_push (TV_INTEGRATION);
2352 lose = function_cannot_inline_p (decl);
2353 timevar_pop (TV_INTEGRATION);
2354 if (lose || ! optimize)
2356 if (warn_inline && DECL_INLINE (decl))
2357 warning_with_decl (decl, lose);
2358 DECL_ABSTRACT_ORIGIN (decl) = 0;
2359 /* Don't really compile an extern inline function.
2360 If we can't make it inline, pretend
2361 it was only declared. */
2362 if (DECL_EXTERNAL (decl))
2364 DECL_INITIAL (decl) = 0;
2365 goto exit_rest_of_compilation;
2369 /* ??? Note that this has the effect of making it look
2370 like "inline" was specified for a function if we choose
2371 to inline it. This isn't quite right, but it's
2372 probably not worth the trouble to fix. */
2373 inlinable = DECL_INLINE (decl) = 1;
2376 insns = get_insns ();
2378 /* Dump the rtl code if we are dumping rtl. */
2380 if (open_dump_file (DFI_rtl, decl))
2382 if (DECL_SAVED_INSNS (decl))
2383 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2384 close_dump_file (DFI_rtl, print_rtl, insns);
2387 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2388 sorts of eh initialization. Delay this until after the
2389 initial rtl dump so that we can see the original nesting. */
2390 convert_from_eh_region_ranges ();
2392 /* If function is inline, and we don't yet know whether to
2393 compile it by itself, defer decision till end of compilation.
2394 finish_compilation will call rest_of_compilation again
2395 for those functions that need to be output. Also defer those
2396 functions that we are supposed to defer. */
2399 || (DECL_INLINE (decl)
2400 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2401 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2402 && ! flag_keep_inline_functions)
2403 || DECL_EXTERNAL (decl))))
2404 DECL_DEFER_OUTPUT (decl) = 1;
2406 if (DECL_INLINE (decl))
2407 /* DWARF wants separate debugging info for abstract and
2408 concrete instances of all inline functions, including those
2409 declared inline but not inlined, and those inlined even
2410 though they weren't declared inline. Conveniently, that's
2411 what DECL_INLINE means at this point. */
2412 (*debug_hooks->deferred_inline_function) (decl);
2414 if (DECL_DEFER_OUTPUT (decl))
2416 /* If -Wreturn-type, we have to do a bit of compilation. We just
2417 want to call cleanup the cfg to figure out whether or not we can
2418 fall off the end of the function; we do the minimum amount of
2419 work necessary to make that safe. */
2420 if (warn_return_type)
2422 int saved_optimize = optimize;
2425 rebuild_jump_labels (insns);
2426 find_exception_handler_labels ();
2427 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2428 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2429 optimize = saved_optimize;
2431 /* CFG is no longer maintained up-to-date. */
2432 free_bb_for_insn ();
2435 current_function_nothrow = nothrow_function_p ();
2436 if (current_function_nothrow)
2437 /* Now we know that this can't throw; set the flag for the benefit
2438 of other functions later in this translation unit. */
2439 TREE_NOTHROW (current_function_decl) = 1;
2441 timevar_push (TV_INTEGRATION);
2442 save_for_inline (decl);
2443 timevar_pop (TV_INTEGRATION);
2444 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2445 goto exit_rest_of_compilation;
2448 /* If specified extern inline but we aren't inlining it, we are
2449 done. This goes for anything that gets here with DECL_EXTERNAL
2450 set, not just things with DECL_INLINE. */
2451 if (DECL_EXTERNAL (decl))
2452 goto exit_rest_of_compilation;
2455 /* If we're emitting a nested function, make sure its parent gets
2456 emitted as well. Doing otherwise confuses debug info. */
2459 for (parent = DECL_CONTEXT (current_function_decl);
2460 parent != NULL_TREE;
2461 parent = get_containing_scope (parent))
2462 if (TREE_CODE (parent) == FUNCTION_DECL)
2463 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2466 /* We are now committed to emitting code for this function. Do any
2467 preparation, such as emitting abstract debug info for the inline
2468 before it gets mangled by optimization. */
2469 if (DECL_INLINE (decl))
2470 (*debug_hooks->outlining_inline_function) (decl);
2472 /* Remove any notes we don't need. That will make iterating
2473 over the instruction sequence faster, and allow the garbage
2474 collector to reclaim the memory used by the notes. */
2475 remove_unnecessary_notes ();
2480 /* Initialize some variables used by the optimizers. */
2481 init_function_for_compilation ();
2483 if (! DECL_DEFER_OUTPUT (decl))
2484 TREE_ASM_WRITTEN (decl) = 1;
2486 /* Now that integrate will no longer see our rtl, we need not
2487 distinguish between the return value of this function and the
2488 return value of called functions. Also, we can remove all SETs
2489 of subregs of hard registers; they are only here because of
2490 integrate. Also, we can now initialize pseudos intended to
2491 carry magic hard reg data throughout the function. */
2492 rtx_equal_function_value_matters = 0;
2493 purge_hard_subreg_sets (get_insns ());
2495 /* Early return if there were errors. We can run afoul of our
2496 consistency checks, and there's not really much point in fixing them.
2497 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2498 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2499 || errorcount || sorrycount)
2500 goto exit_rest_of_compilation;
2502 timevar_push (TV_JUMP);
2503 open_dump_file (DFI_sibling, decl);
2504 insns = get_insns ();
2505 rebuild_jump_labels (insns);
2506 find_exception_handler_labels ();
2507 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2509 delete_unreachable_blocks ();
2511 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2512 note_prediction_to_br_prob ();
2514 /* We may have potential sibling or tail recursion sites. Select one
2515 (of possibly multiple) methods of performing the call. */
2516 if (flag_optimize_sibling_calls)
2519 optimize_sibling_and_tail_recursive_calls ();
2521 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2522 notes before simplifying cfg and we must do lowering after sibcall
2523 that unhides parts of RTL chain and cleans up the CFG.
2525 Until sibcall is replaced by tree-level optimizer, lets just
2526 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2527 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2528 if (GET_CODE (insn) == NOTE
2529 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2532 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2533 timevar_pop (TV_JUMP);
2535 /* Complete generation of exception handling code. */
2536 find_exception_handler_labels ();
2539 timevar_push (TV_JUMP);
2540 open_dump_file (DFI_eh, decl);
2542 finish_eh_generation ();
2544 close_dump_file (DFI_eh, print_rtl, get_insns ());
2545 timevar_pop (TV_JUMP);
2548 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2549 generation, which might create new sets. */
2550 emit_initial_value_sets ();
2553 /* If we are doing position-independent code generation, now
2554 is the time to output special prologues and epilogues.
2555 We do not want to do this earlier, because it just clutters
2556 up inline functions with meaningless insns. */
2561 insns = get_insns ();
2563 /* Copy any shared structure that should not be shared. */
2564 unshare_all_rtl (current_function_decl, insns);
2566 #ifdef SETJMP_VIA_SAVE_AREA
2567 /* This must be performed before virtual register instantiation. */
2568 if (current_function_calls_alloca)
2569 optimize_save_area_alloca (insns);
2572 /* Instantiate all virtual registers. */
2573 instantiate_virtual_regs (current_function_decl, insns);
2575 open_dump_file (DFI_jump, decl);
2577 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2578 are initialized and to compute whether control can drop off the end
2581 timevar_push (TV_JUMP);
2582 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2583 before jump optimization switches branch directions. */
2584 expected_value_to_br_prob ();
2586 reg_scan (insns, max_reg_num (), 0);
2587 rebuild_jump_labels (insns);
2588 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2590 dump_flow_info (rtl_dump_file);
2591 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2592 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2594 /* CFG is no longer maintained up-to-date. */
2595 free_bb_for_insn ();
2596 copy_loop_headers (insns);
2597 purge_line_number_notes (insns);
2599 timevar_pop (TV_JUMP);
2600 close_dump_file (DFI_jump, print_rtl, insns);
2602 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2603 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2605 goto exit_rest_of_compilation;
2608 /* Long term, this should probably move before the jump optimizer too,
2609 but I didn't want to disturb the rtl_dump_and_exit and related
2610 stuff at this time. */
2611 if (optimize > 0 && flag_ssa)
2613 /* Convert to SSA form. */
2615 timevar_push (TV_TO_SSA);
2616 open_dump_file (DFI_ssa, decl);
2618 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2619 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2622 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2623 timevar_pop (TV_TO_SSA);
2625 /* Perform sparse conditional constant propagation, if requested. */
2628 timevar_push (TV_SSA_CCP);
2629 open_dump_file (DFI_ssa_ccp, decl);
2633 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2634 timevar_pop (TV_SSA_CCP);
2637 /* It would be useful to cleanup the CFG at this point, but block
2638 merging and possibly other transformations might leave a PHI
2639 node in the middle of a basic block, which is a strict no-no. */
2641 /* The SSA implementation uses basic block numbers in its phi
2642 nodes. Thus, changing the control-flow graph or the basic
2643 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2644 may cause problems. */
2648 /* Remove dead code. */
2650 timevar_push (TV_SSA_DCE);
2651 open_dump_file (DFI_ssa_dce, decl);
2653 insns = get_insns ();
2654 ssa_eliminate_dead_code ();
2656 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2657 timevar_pop (TV_SSA_DCE);
2660 /* Convert from SSA form. */
2662 timevar_push (TV_FROM_SSA);
2663 open_dump_file (DFI_ussa, decl);
2665 convert_from_ssa ();
2666 /* New registers have been created. Rescan their usage. */
2667 reg_scan (insns, max_reg_num (), 1);
2669 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2670 timevar_pop (TV_FROM_SSA);
2673 /* CFG is no longer maintained up-to-date. */
2674 free_bb_for_insn ();
2677 timevar_push (TV_JUMP);
2679 if (flag_delete_null_pointer_checks || flag_if_conversion)
2681 open_dump_file (DFI_null, decl);
2682 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2684 dump_flow_info (rtl_dump_file);
2685 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2687 /* Try to identify useless null pointer tests and delete them. */
2688 if (flag_delete_null_pointer_checks)
2689 delete_null_pointer_checks (insns);
2691 timevar_push (TV_IFCVT);
2692 if (flag_if_conversion)
2694 timevar_pop (TV_IFCVT);
2695 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2696 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2699 /* Jump optimization, and the removal of NULL pointer checks, may
2700 have reduced the number of instructions substantially. CSE, and
2701 future passes, allocate arrays whose dimensions involve the
2702 maximum instruction UID, so if we can reduce the maximum UID
2703 we'll save big on memory. */
2704 renumber_insns (rtl_dump_file);
2706 compute_bb_for_insn (get_max_uid ());
2707 timevar_pop (TV_JUMP);
2709 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2713 /* Perform common subexpression elimination.
2714 Nonzero value from `cse_main' means that jumps were simplified
2715 and some code may now be unreachable, so do
2716 jump optimization again. */
2720 open_dump_file (DFI_cse, decl);
2722 dump_flow_info (rtl_dump_file);
2723 timevar_push (TV_CSE);
2725 reg_scan (insns, max_reg_num (), 1);
2727 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2729 rebuild_jump_labels (insns);
2730 purge_all_dead_edges (0);
2732 delete_trivially_dead_insns (insns, max_reg_num ());
2734 /* If we are not running more CSE passes, then we are no longer
2735 expecting CSE to be run. But always rerun it in a cheap mode. */
2736 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2738 if (tem || optimize > 1)
2739 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2740 /* Try to identify useless null pointer tests and delete them. */
2741 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2743 timevar_push (TV_JUMP);
2745 if (flag_delete_null_pointer_checks)
2746 delete_null_pointer_checks (insns);
2747 /* CFG is no longer maintained up-to-date. */
2748 timevar_pop (TV_JUMP);
2751 /* The second pass of jump optimization is likely to have
2752 removed a bunch more instructions. */
2753 renumber_insns (rtl_dump_file);
2754 compute_bb_for_insn (get_max_uid ());
2756 timevar_pop (TV_CSE);
2757 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2760 open_dump_file (DFI_addressof, decl);
2762 purge_addressof (insns);
2764 purge_all_dead_edges (0);
2765 reg_scan (insns, max_reg_num (), 1);
2767 close_dump_file (DFI_addressof, print_rtl, insns);
2771 /* Perform global cse. */
2773 if (optimize > 0 && flag_gcse)
2775 int save_csb, save_cfj;
2778 timevar_push (TV_GCSE);
2779 open_dump_file (DFI_gcse, decl);
2781 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2782 tem = gcse_main (insns, rtl_dump_file);
2783 rebuild_jump_labels (insns);
2784 delete_trivially_dead_insns (insns, max_reg_num ());
2786 save_csb = flag_cse_skip_blocks;
2787 save_cfj = flag_cse_follow_jumps;
2788 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2790 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2792 if (flag_expensive_optimizations)
2794 timevar_push (TV_CSE);
2795 reg_scan (insns, max_reg_num (), 1);
2796 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2797 purge_all_dead_edges (0);
2798 delete_trivially_dead_insns (insns, max_reg_num ());
2799 timevar_pop (TV_CSE);
2800 cse_not_expected = !flag_rerun_cse_after_loop;
2803 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2804 things up. Then possibly re-run CSE again. */
2808 timevar_push (TV_JUMP);
2809 rebuild_jump_labels (insns);
2810 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2811 timevar_pop (TV_JUMP);
2813 if (flag_expensive_optimizations)
2815 timevar_push (TV_CSE);
2816 reg_scan (insns, max_reg_num (), 1);
2817 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2818 purge_all_dead_edges (0);
2819 delete_trivially_dead_insns (insns, max_reg_num ());
2820 timevar_pop (TV_CSE);
2824 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2825 timevar_pop (TV_GCSE);
2828 flag_cse_skip_blocks = save_csb;
2829 flag_cse_follow_jumps = save_cfj;
2830 #ifdef ENABLE_CHECKING
2831 verify_flow_info ();
2835 /* Move constant computations out of loops. */
2837 if (optimize > 0 && flag_loop_optimize)
2839 timevar_push (TV_LOOP);
2840 delete_dead_jumptables ();
2841 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2842 open_dump_file (DFI_loop, decl);
2843 /* CFG is no longer maintained up-to-date. */
2844 free_bb_for_insn ();
2846 if (flag_rerun_loop_opt)
2848 cleanup_barriers ();
2850 /* We only want to perform unrolling once. */
2851 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2853 /* The first call to loop_optimize makes some instructions
2854 trivially dead. We delete those instructions now in the
2855 hope that doing so will make the heuristics in loop work
2856 better and possibly speed up compilation. */
2857 delete_trivially_dead_insns (insns, max_reg_num ());
2859 /* The regscan pass is currently necessary as the alias
2860 analysis code depends on this information. */
2861 reg_scan (insns, max_reg_num (), 1);
2863 cleanup_barriers ();
2864 loop_optimize (insns, rtl_dump_file,
2865 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2866 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2868 /* Loop can create trivially dead instructions. */
2869 delete_trivially_dead_insns (insns, max_reg_num ());
2870 close_dump_file (DFI_loop, print_rtl, insns);
2871 timevar_pop (TV_LOOP);
2876 /* Do control and data flow analysis; wrote some of the results to
2879 timevar_push (TV_FLOW);
2880 open_dump_file (DFI_cfg, decl);
2882 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2884 dump_flow_info (rtl_dump_file);
2885 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2886 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2888 /* It may make more sense to mark constant functions after dead code is
2889 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2890 may insert code making function non-constant, but we still must consider
2891 it as constant, otherwise -fbranch-probabilities will not read data back.
2893 life_analyzis rarely eliminates modification of external memory.
2896 mark_constant_function ();
2898 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2900 /* Do branch profiling and static profile estimation passes. */
2901 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
2905 timevar_push (TV_BRANCH_PROB);
2906 open_dump_file (DFI_bp, decl);
2907 if (cfun->arc_profile || flag_branch_probabilities)
2910 /* Discover and record the loop depth at the head of each basic
2911 block. The loop infrastructure does the real job for us. */
2912 flow_loops_find (&loops, LOOP_TREE);
2914 /* Estimate using heuristics if no profiling info is available. */
2915 if (flag_guess_branch_prob)
2916 estimate_probability (&loops);
2919 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2921 flow_loops_free (&loops);
2922 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2923 timevar_pop (TV_BRANCH_PROB);
2928 timevar_push (TV_CSE2);
2929 open_dump_file (DFI_cse2, decl);
2931 dump_flow_info (rtl_dump_file);
2933 if (flag_rerun_cse_after_loop)
2935 timevar_push (TV_JUMP);
2937 reg_scan (insns, max_reg_num (), 0);
2939 timevar_push (TV_IFCVT);
2940 cleanup_cfg (CLEANUP_EXPENSIVE);
2941 if (flag_if_conversion)
2943 timevar_pop (TV_IFCVT);
2945 timevar_pop (TV_JUMP);
2946 /* CFG is no longer maintained up-to-date. */
2947 reg_scan (insns, max_reg_num (), 0);
2948 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2949 purge_all_dead_edges (0);
2950 delete_trivially_dead_insns (insns, max_reg_num ());
2954 timevar_push (TV_JUMP);
2955 rebuild_jump_labels (insns);
2956 cleanup_cfg (CLEANUP_EXPENSIVE);
2957 timevar_pop (TV_JUMP);
2961 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2962 timevar_pop (TV_CSE2);
2967 cse_not_expected = 1;
2969 open_dump_file (DFI_life, decl);
2972 check_function_return_warnings ();
2974 #ifdef ENABLE_CHECKING
2975 verify_flow_info ();
2977 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2979 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2980 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2981 timevar_pop (TV_FLOW);
2985 if (warn_uninitialized || extra_warnings)
2987 uninitialized_vars_warning (DECL_INITIAL (decl));
2989 setjmp_args_warning ();
2995 if (initialize_uninitialized_subregs ())
2997 /* Insns were inserted, so things might look a bit different. */
2998 insns = get_insns ();
2999 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3000 PROP_LOG_LINKS | PROP_REG_INFO
3001 | PROP_DEATH_NOTES);
3005 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3009 /* If -opt, try combining insns through substitution. */
3013 int rebuild_jump_labels_after_combine = 0;
3015 timevar_push (TV_COMBINE);
3016 open_dump_file (DFI_combine, decl);
3018 rebuild_jump_labels_after_combine
3019 = combine_instructions (insns, max_reg_num ());
3021 /* Combining insns may have turned an indirect jump into a
3022 direct jump. Rebuid the JUMP_LABEL fields of jumping
3024 if (rebuild_jump_labels_after_combine)
3026 timevar_push (TV_JUMP);
3027 rebuild_jump_labels (insns);
3028 timevar_pop (TV_JUMP);
3030 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3033 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3034 timevar_pop (TV_COMBINE);
3039 /* Rerun if-conversion, as combine may have simplified things enough to
3040 now meet sequence length restrictions. */
3041 if (flag_if_conversion)
3043 timevar_push (TV_IFCVT);
3044 open_dump_file (DFI_ce, decl);
3050 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3051 timevar_pop (TV_IFCVT);
3054 /* Register allocation pre-pass, to reduce number of moves
3055 necessary for two-address machines. */
3056 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3058 timevar_push (TV_REGMOVE);
3059 open_dump_file (DFI_regmove, decl);
3061 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3063 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3064 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3065 timevar_pop (TV_REGMOVE);
3070 /* Do unconditional splitting before register allocation to allow machine
3071 description to add extra information not needed previously. */
3072 split_all_insns (1);
3074 /* Any of the several passes since flow1 will have munged register
3075 lifetime data a bit. */
3076 register_life_up_to_date = 0;
3078 #ifdef OPTIMIZE_MODE_SWITCHING
3079 timevar_push (TV_MODE_SWITCH);
3082 optimize_mode_switching (NULL);
3085 timevar_pop (TV_MODE_SWITCH);
3088 timevar_push (TV_SCHED);
3090 #ifdef INSN_SCHEDULING
3092 /* Print function header into sched dump now
3093 because doing the sched analysis makes some of the dump. */
3094 if (optimize > 0 && flag_schedule_insns)
3096 open_dump_file (DFI_sched, decl);
3098 /* Do control and data sched analysis,
3099 and write some of the results to dump file. */
3101 schedule_insns (rtl_dump_file);
3103 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3105 /* Register lifetime information was updated as part of verifying
3107 register_life_up_to_date = 1;
3110 timevar_pop (TV_SCHED);
3114 /* Determine if the current function is a leaf before running reload
3115 since this can impact optimizations done by the prologue and
3116 epilogue thus changing register elimination offsets. */
3117 current_function_is_leaf = leaf_function_p ();
3119 timevar_push (TV_LOCAL_ALLOC);
3120 open_dump_file (DFI_lreg, decl);
3122 /* Allocate pseudo-regs that are used only within 1 basic block.
3124 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3125 jump optimizer after register allocation and reloading are finished. */
3127 if (! register_life_up_to_date)
3128 recompute_reg_usage (insns, ! optimize_size);
3130 /* Allocate the reg_renumber array. */
3131 allocate_reg_info (max_regno, FALSE, TRUE);
3133 /* And the reg_equiv_memory_loc array. */
3134 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3136 allocate_initial_values (reg_equiv_memory_loc);
3138 regclass (insns, max_reg_num (), rtl_dump_file);
3139 rebuild_label_notes_after_reload = local_alloc ();
3141 timevar_pop (TV_LOCAL_ALLOC);
3143 if (dump_file[DFI_lreg].enabled)
3145 timevar_push (TV_DUMP);
3147 dump_flow_info (rtl_dump_file);
3148 dump_local_alloc (rtl_dump_file);
3150 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3151 timevar_pop (TV_DUMP);
3156 timevar_push (TV_GLOBAL_ALLOC);
3157 open_dump_file (DFI_greg, decl);
3159 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3160 pass fixing up any insns that are invalid. */
3163 failure = global_alloc (rtl_dump_file);
3166 build_insn_chain (insns);
3167 failure = reload (insns, 0);
3170 timevar_pop (TV_GLOBAL_ALLOC);
3172 if (dump_file[DFI_greg].enabled)
3174 timevar_push (TV_DUMP);
3176 dump_global_regs (rtl_dump_file);
3178 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3179 timevar_pop (TV_DUMP);
3183 goto exit_rest_of_compilation;
3187 open_dump_file (DFI_postreload, decl);
3189 /* Do a very simple CSE pass over just the hard registers. */
3192 timevar_push (TV_RELOAD_CSE_REGS);
3193 reload_cse_regs (insns);
3194 timevar_pop (TV_RELOAD_CSE_REGS);
3197 /* Register allocation and reloading may have turned an indirect jump into
3198 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3199 jumping instructions. */
3200 if (rebuild_label_notes_after_reload)
3202 timevar_push (TV_JUMP);
3204 rebuild_jump_labels (insns);
3205 purge_all_dead_edges (0);
3207 timevar_pop (TV_JUMP);
3210 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3212 /* Re-create the death notes which were deleted during reload. */
3213 timevar_push (TV_FLOW2);
3214 open_dump_file (DFI_flow2, decl);
3216 #ifdef ENABLE_CHECKING
3217 verify_flow_info ();
3220 /* If optimizing, then go ahead and split insns now. */
3222 split_all_insns (0);
3224 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3226 /* On some machines, the prologue and epilogue code, or parts thereof,
3227 can be represented as RTL. Doing so lets us schedule insns between
3228 it and the rest of the code and also allows delayed branch
3229 scheduling to operate in the epilogue. */
3230 thread_prologue_and_epilogue_insns (insns);
3234 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3235 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3236 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3238 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3239 even for machines with possibly nonzero RETURN_POPS_ARGS
3240 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3241 push instructions will have popping returns. */
3242 #ifndef PUSH_ROUNDING
3243 if (!ACCUMULATE_OUTGOING_ARGS)
3245 combine_stack_adjustments ();
3250 flow2_completed = 1;
3252 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3253 timevar_pop (TV_FLOW2);
3255 #ifdef HAVE_peephole2
3256 if (optimize > 0 && flag_peephole2)
3258 timevar_push (TV_PEEPHOLE2);
3259 open_dump_file (DFI_peephole2, decl);
3261 peephole2_optimize (rtl_dump_file);
3263 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3264 timevar_pop (TV_PEEPHOLE2);
3268 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3270 timevar_push (TV_RENAME_REGISTERS);
3271 open_dump_file (DFI_rnreg, decl);
3273 if (flag_rename_registers)
3274 regrename_optimize ();
3275 if (flag_cprop_registers)
3276 copyprop_hardreg_forward ();
3278 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3279 timevar_pop (TV_RENAME_REGISTERS);
3282 if (flag_if_conversion2)
3284 timevar_push (TV_IFCVT2);
3285 open_dump_file (DFI_ce2, decl);
3289 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3290 timevar_pop (TV_IFCVT2);
3294 split_all_insns (1);
3297 #ifdef INSN_SCHEDULING
3298 if (optimize > 0 && flag_schedule_insns_after_reload)
3300 timevar_push (TV_SCHED2);
3301 open_dump_file (DFI_sched2, decl);
3303 /* Do control and data sched analysis again,
3304 and write some more of the results to dump file. */
3306 split_all_insns (1);
3308 schedule_insns (rtl_dump_file);
3310 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3311 timevar_pop (TV_SCHED2);
3317 #ifdef LEAF_REGISTERS
3318 current_function_uses_only_leaf_regs
3319 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3323 timevar_push (TV_REG_STACK);
3324 open_dump_file (DFI_stack, decl);
3326 reg_to_stack (insns, rtl_dump_file);
3328 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3329 timevar_pop (TV_REG_STACK);
3335 timevar_push (TV_REORDER_BLOCKS);
3336 open_dump_file (DFI_bbro, decl);
3338 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3339 splitting possibly introduced more crossjumping oppurtuntities.
3340 Except that we can't actually run crossjumping without running
3341 another DCE pass, which we can't do after reg-stack. */
3342 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3343 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3344 if (flag_reorder_blocks)
3346 reorder_basic_blocks ();
3347 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3350 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3351 timevar_pop (TV_REORDER_BLOCKS);
3353 compute_alignments ();
3355 /* CFG is no longer maintained up-to-date. */
3356 free_bb_for_insn ();
3358 /* If a machine dependent reorganization is needed, call it. */
3359 #ifdef MACHINE_DEPENDENT_REORG
3360 timevar_push (TV_MACH_DEP);
3361 open_dump_file (DFI_mach, decl);
3363 MACHINE_DEPENDENT_REORG (insns);
3365 close_dump_file (DFI_mach, print_rtl, insns);
3366 timevar_pop (TV_MACH_DEP);
3371 purge_line_number_notes (insns);
3372 cleanup_barriers ();
3374 /* If a scheduling pass for delayed branches is to be done,
3375 call the scheduling code. */
3378 if (optimize > 0 && flag_delayed_branch)
3380 timevar_push (TV_DBR_SCHED);
3381 open_dump_file (DFI_dbr, decl);
3383 dbr_schedule (insns, rtl_dump_file);
3385 close_dump_file (DFI_dbr, print_rtl, insns);
3386 timevar_pop (TV_DBR_SCHED);
3392 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3393 timevar_push (TV_SHORTEN_BRANCH);
3394 split_all_insns_noflow ();
3395 timevar_pop (TV_SHORTEN_BRANCH);
3398 convert_to_eh_region_ranges ();
3400 /* Shorten branches. */
3401 timevar_push (TV_SHORTEN_BRANCH);
3402 shorten_branches (get_insns ());
3403 timevar_pop (TV_SHORTEN_BRANCH);
3405 current_function_nothrow = nothrow_function_p ();
3406 if (current_function_nothrow)
3407 /* Now we know that this can't throw; set the flag for the benefit
3408 of other functions later in this translation unit. */
3409 TREE_NOTHROW (current_function_decl) = 1;
3411 /* Now turn the rtl into assembler code. */
3413 timevar_push (TV_FINAL);
3418 /* Get the function's name, as described by its RTL. This may be
3419 different from the DECL_NAME name used in the source file. */
3421 x = DECL_RTL (decl);
3422 if (GET_CODE (x) != MEM)
3425 if (GET_CODE (x) != SYMBOL_REF)
3427 fnname = XSTR (x, 0);
3429 assemble_start_function (decl, fnname);
3430 final_start_function (insns, asm_out_file, optimize);
3431 final (insns, asm_out_file, optimize, 0);
3432 final_end_function ();
3434 #ifdef IA64_UNWIND_INFO
3435 /* ??? The IA-64 ".handlerdata" directive must be issued before
3436 the ".endp" directive that closes the procedure descriptor. */
3437 output_function_exception_table ();
3440 assemble_end_function (decl, fnname);
3442 #ifndef IA64_UNWIND_INFO
3443 /* Otherwise, it feels unclean to switch sections in the middle. */
3444 output_function_exception_table ();
3448 fflush (asm_out_file);
3450 /* Release all memory allocated by flow. */
3451 free_basic_block_vars (0);
3453 /* Release all memory held by regsets now. */
3454 regset_release_memory ();
3456 timevar_pop (TV_FINAL);
3460 /* Write DBX symbols if requested. */
3462 /* Note that for those inline functions where we don't initially
3463 know for certain that we will be generating an out-of-line copy,
3464 the first invocation of this routine (rest_of_compilation) will
3465 skip over this code by doing a `goto exit_rest_of_compilation;'.
3466 Later on, finish_compilation will call rest_of_compilation again
3467 for those inline functions that need to have out-of-line copies
3468 generated. During that call, we *will* be routed past here. */
3470 timevar_push (TV_SYMOUT);
3471 (*debug_hooks->function_decl) (decl);
3472 timevar_pop (TV_SYMOUT);
3474 exit_rest_of_compilation:
3476 /* In case the function was not output,
3477 don't leave any temporary anonymous types
3478 queued up for sdb output. */
3479 #ifdef SDB_DEBUGGING_INFO
3480 if (write_symbols == SDB_DEBUG)
3481 sdbout_types (NULL_TREE);
3484 reload_completed = 0;
3485 flow2_completed = 0;
3488 timevar_push (TV_FINAL);
3490 /* Clear out the insn_length contents now that they are no
3492 init_insn_lengths ();
3494 /* Clear out the real_constant_chain before some of the rtx's
3495 it runs through become garbage. */
3496 clear_const_double_mem ();
3498 /* Show no temporary slots allocated. */
3501 free_basic_block_vars (0);
3502 free_bb_for_insn ();
3504 timevar_pop (TV_FINAL);
3506 /* Make sure volatile mem refs aren't considered valid operands for
3507 arithmetic insns. We must call this here if this is a nested inline
3508 function, since the above code leaves us in the init_recog state
3509 (from final.c), and the function context push/pop code does not
3510 save/restore volatile_ok.
3512 ??? Maybe it isn't necessary for expand_start_function to call this
3513 anymore if we do it here? */
3515 init_recog_no_volatile ();
3517 /* We're done with this function. Free up memory if we can. */
3518 free_after_parsing (cfun);
3519 if (! DECL_DEFER_OUTPUT (decl))
3521 free_after_compilation (cfun);
3523 /* Clear integrate.c's pointer to the cfun structure we just
3525 DECL_SAVED_INSNS (decl) = 0;
3531 timevar_pop (TV_REST_OF_COMPILATION);
3541 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3542 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3543 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3544 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3545 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3546 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"));
3548 for (i = ARRAY_SIZE (f_options); i--;)
3550 const char *description = f_options[i].description;
3552 if (description != NULL && *description != 0)
3553 printf (" -f%-21s %s\n",
3554 f_options[i].string, _(description));
3557 printf (_(" -O[number] Set optimization level to [number]\n"));
3558 printf (_(" -Os Optimize for space rather than speed\n"));
3559 for (i = LAST_PARAM; i--;)
3561 const char *description = compiler_params[i].help;
3562 const int length = 21 - strlen (compiler_params[i].option);
3564 if (description != NULL && *description != 0)
3565 printf (" --param %s=<value>%.*s%s\n",
3566 compiler_params[i].option,
3567 length > 0 ? length : 1, " ",
3570 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3571 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3572 printf (_(" -w Suppress warnings\n"));
3573 printf (_(" -W Enable extra warnings\n"));
3575 for (i = ARRAY_SIZE (W_options); i--;)
3577 const char *description = W_options[i].description;
3579 if (description != NULL && *description != 0)
3580 printf (" -W%-21s %s\n",
3581 W_options[i].string, _(description));
3584 printf (_(" -Wunused Enable unused warnings\n"));
3585 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3586 printf (_(" -p Enable function profiling\n"));
3587 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3588 printf (_(" -a Enable block profiling \n"));
3590 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3591 printf (_(" -ax Enable jump profiling \n"));
3593 printf (_(" -o <file> Place output into <file> \n"));
3595 -G <number> Put global and static data smaller than <number>\n\
3596 bytes into a special section (on some targets)\n"));
3598 for (i = ARRAY_SIZE (debug_args); i--;)
3600 if (debug_args[i].description != NULL)
3601 printf (" -g%-21s %s\n",
3602 debug_args[i].arg, _(debug_args[i].description));
3605 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3606 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3607 printf (_(" -version Display the compiler's version\n"));
3608 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3609 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3610 #if defined INSN_SCHEDULING
3611 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3613 printf (_(" --help Display this information\n"));
3618 /* Display descriptions of language specific options.
3619 If there is no description, note that there is an undocumented option.
3620 If the description is empty, do not display anything. (This allows
3621 options to be deliberately undocumented, for whatever reason).
3622 If the option string is missing, then this is a marker, indicating
3623 that the description string is in fact the name of a language, whose
3624 language specific options are to follow. */
3626 if (ARRAY_SIZE (documented_lang_options) > 1)
3628 printf (_("\nLanguage specific options:\n"));
3630 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3632 const char *description = documented_lang_options[i].description;
3633 const char *option = documented_lang_options[i].option;
3635 if (description == NULL)
3640 printf (_(" %-23.23s [undocumented]\n"), option);
3642 else if (*description == 0)
3644 else if (option == NULL)
3648 (_("\nThere are undocumented %s specific options as well.\n"),
3652 printf (_("\n Options for %s:\n"), description);
3657 printf (" %-23.23s %s\n", option, _(description));
3662 printf (_("\nThere are undocumented %s specific options as well.\n"),
3665 display_target_options ();
3669 display_target_options ()
3672 static bool displayed = false;
3674 /* Avoid double printing for --help --target-help. */
3679 if (ARRAY_SIZE (target_switches) > 1
3680 #ifdef TARGET_OPTIONS
3681 || ARRAY_SIZE (target_options) > 1
3689 printf (_("\nTarget specific options:\n"));
3691 for (i = ARRAY_SIZE (target_switches); i--;)
3693 const char *option = target_switches[i].name;
3694 const char *description = target_switches[i].description;
3696 if (option == NULL || *option == 0)
3698 else if (description == NULL)
3703 printf (_(" -m%-23.23s [undocumented]\n"), option);
3705 else if (*description != 0)
3706 doc += printf (" -m%-23.23s %s\n", option, _(description));
3709 #ifdef TARGET_OPTIONS
3710 for (i = ARRAY_SIZE (target_options); i--;)
3712 const char *option = target_options[i].prefix;
3713 const char *description = target_options[i].description;
3715 if (option == NULL || *option == 0)
3717 else if (description == NULL)
3722 printf (_(" -m%-23.23s [undocumented]\n"), option);
3724 else if (*description != 0)
3725 doc += printf (" -m%-23.23s %s\n", option, _(description));
3731 printf (_("\nThere are undocumented target specific options as well.\n"));
3733 printf (_(" They exist, but they are not documented.\n"));
3738 /* Parse a -d... command line switch. */
3741 decode_d_option (arg)
3750 for (i = 0; i < (int) DFI_MAX; ++i)
3751 dump_file[i].enabled = 1;
3757 flag_print_asm_name = 1;
3760 flag_dump_rtl_in_asm = 1;
3761 flag_print_asm_name = 1;
3764 graph_dump_format = vcg;
3767 rtl_dump_and_exit = 1;
3772 case 'D': /* These are handled by the preprocessor. */
3778 for (i = 0; i < (int) DFI_MAX; ++i)
3779 if (c == dump_file[i].debug_switch)
3781 dump_file[i].enabled = 1;
3786 warning ("unrecognized gcc debugging option: %c", c);
3791 /* Parse a -f... command line switch. ARG is the value after the -f.
3792 It is safe to access 'ARG - 2' to generate the full switch name.
3793 Return the number of strings consumed. */
3796 decode_f_option (arg)
3800 const char *option_value = NULL;
3802 /* Search for the option in the table of binary f options. */
3803 for (j = ARRAY_SIZE (f_options); j--;)
3805 if (!strcmp (arg, f_options[j].string))
3807 *f_options[j].variable = f_options[j].on_value;
3811 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3812 && ! strcmp (arg + 3, f_options[j].string))
3814 *f_options[j].variable = ! f_options[j].on_value;
3819 if (!strcmp (arg, "fast-math"))
3820 set_fast_math_flags ();
3821 else if (!strcmp (arg, "no-fast-math"))
3822 set_no_fast_math_flags ();
3823 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3824 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3827 read_integral_parameter (option_value, arg - 2,
3829 set_param_value ("max-inline-insns", val);
3831 #ifdef INSN_SCHEDULING
3832 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3833 fix_sched_param ("verbose", option_value);
3835 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3836 fix_register (option_value, 1, 1);
3837 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3838 fix_register (option_value, 0, 1);
3839 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3840 fix_register (option_value, 0, 0);
3841 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3842 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3843 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3845 = read_integral_parameter (option_value, arg - 2, align_functions);
3846 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3847 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3848 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3850 = read_integral_parameter (option_value, arg - 2, align_labels);
3851 else if ((option_value
3852 = skip_leading_substring (arg, "stack-limit-register=")))
3854 int reg = decode_reg_name (option_value);
3856 error ("unrecognized register name `%s'", option_value);
3858 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3860 else if ((option_value
3861 = skip_leading_substring (arg, "stack-limit-symbol=")))
3864 nm = ggc_strdup (option_value);
3865 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3867 else if ((option_value
3868 = skip_leading_substring (arg, "message-length=")))
3869 output_set_maximum_length
3870 (&global_dc->buffer, read_integral_parameter
3871 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3872 else if ((option_value
3873 = skip_leading_substring (arg, "diagnostics-show-location=")))
3875 if (!strcmp (option_value, "once"))
3876 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3877 else if (!strcmp (option_value, "every-line"))
3878 diagnostic_prefixing_rule (global_dc)
3879 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3881 error ("unrecognized option `%s'", arg - 2);
3883 else if (!strcmp (arg, "no-stack-limit"))
3884 stack_limit_rtx = NULL_RTX;
3885 else if (!strcmp (arg, "preprocessed"))
3886 /* Recognise this switch but do nothing. This prevents warnings
3887 about an unrecognized switch if cpplib has not been linked in. */
3895 /* Parse a -W... command line switch. ARG is the value after the -W.
3896 It is safe to access 'ARG - 2' to generate the full switch name.
3897 Return the number of strings consumed. */
3900 decode_W_option (arg)
3903 const char *option_value = NULL;
3906 /* Search for the option in the table of binary W options. */
3908 for (j = ARRAY_SIZE (W_options); j--;)
3910 if (!strcmp (arg, W_options[j].string))
3912 *W_options[j].variable = W_options[j].on_value;
3916 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3917 && ! strcmp (arg + 3, W_options[j].string))
3919 *W_options[j].variable = ! W_options[j].on_value;
3924 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3925 warning ("-Wid-clash-LEN is no longer supported");
3926 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3928 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3930 warn_larger_than = larger_than_size != -1;
3932 else if (!strcmp (arg, "unused"))
3936 else if (!strcmp (arg, "no-unused"))
3946 /* Parse a -g... command line switch. ARG is the value after the -g.
3947 It is safe to access 'ARG - 2' to generate the full switch name.
3948 Return the number of strings consumed. */
3951 decode_g_option (arg)
3954 static unsigned level = 0;
3955 /* A lot of code assumes write_symbols == NO_DEBUG if the
3956 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3957 of what debugging type has been selected). This records the
3958 selected type. It is an error to specify more than one
3960 static enum debug_info_type selected_debug_type = NO_DEBUG;
3961 /* Non-zero if debugging format has been explicitly set.
3962 -g and -ggdb don't explicitly set the debugging format so
3963 -gdwarf -g3 is equivalent to -gdwarf3. */
3964 static int type_explicitly_set_p = 0;
3965 /* Indexed by enum debug_info_type. */
3966 static const char *const debug_type_names[] =
3968 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3971 /* The maximum admissible debug level value. */
3972 static const unsigned max_debug_level = 3;
3974 /* Look up ARG in the table. */
3975 for (da = debug_args; da->arg; da++)
3977 const int da_len = strlen (da->arg);
3979 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3981 enum debug_info_type type = da->debug_type;
3982 const char *p = arg + da_len;
3984 if (*p && ! ISDIGIT (*p))
3987 /* A debug flag without a level defaults to level 2.
3988 Note we do not want to call read_integral_parameter
3989 for that case since it will call atoi which
3992 ??? We may want to generalize the interface to
3993 read_integral_parameter to better handle this case
3994 if this case shows up often. */
3996 level = read_integral_parameter (p, 0, max_debug_level + 1);
3998 level = (level == 0) ? 2 : level;
4000 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4002 error ("use -gdwarf -g%d for DWARF v1, level %d",
4005 error ("use -gdwarf-2 for DWARF v2");
4008 if (level > max_debug_level)
4011 ignoring option `%s' due to invalid debug level specification",
4013 level = debug_info_level;
4016 if (type == NO_DEBUG)
4018 type = PREFERRED_DEBUGGING_TYPE;
4020 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4022 #ifdef DWARF2_DEBUGGING_INFO
4023 type = DWARF2_DEBUG;
4025 #ifdef DBX_DEBUGGING_INFO
4032 if (type == NO_DEBUG)
4033 warning ("`%s': unknown or unsupported -g option", arg - 2);
4035 /* Does it conflict with an already selected type? */
4036 if (type_explicitly_set_p
4037 /* -g/-ggdb don't conflict with anything. */
4038 && da->debug_type != NO_DEBUG
4039 && type != selected_debug_type)
4040 warning ("`%s' ignored, conflicts with `-g%s'",
4041 arg - 2, debug_type_names[(int) selected_debug_type]);
4044 /* If the format has already been set, -g/-ggdb
4045 only change the debug level. */
4046 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4047 /* Don't change debugging type. */
4051 selected_debug_type = type;
4052 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4055 write_symbols = (level == 0
4057 : selected_debug_type);
4058 use_gnu_debug_info_extensions = da->use_extensions_p;
4059 debug_info_level = (enum debug_info_level) level;
4072 /* Decode the first argument in the argv as a language-independent option.
4073 Return the number of strings consumed. */
4076 independent_decode_option (argc, argv)
4080 char *arg = argv[0];
4082 if (arg[0] != '-' || arg[1] == 0)
4094 if (!strcmp (arg, "-help"))
4097 exit_after_options = 1;
4100 if (!strcmp (arg, "-target-help"))
4102 display_target_options ();
4103 exit_after_options = 1;
4106 if (!strcmp (arg, "-version"))
4108 print_version (stderr, "");
4109 exit_after_options = 1;
4112 /* Handle '--param <name>=<value>'. */
4113 if (strcmp (arg, "-param") == 0)
4119 error ("-param option missing argument");
4123 /* Get the '<name>=<value>' parameter. */
4125 /* Look for the `='. */
4126 equal = strchr (arg, '=');
4128 error ("invalid --param option: %s", arg);
4133 /* Zero out the `=' sign so that we get two separate strings. */
4135 /* Figure out what value is specified. */
4136 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4137 if (val != INVALID_PARAM_VAL)
4138 set_param_value (arg, val);
4140 error ("invalid parameter value `%s'", equal + 1);
4155 /* Already been treated in main (). Do nothing. */
4159 set_target_switch (arg + 1);
4163 return decode_f_option (arg + 1);
4166 return decode_g_option (arg + 1);
4169 if (!strcmp (arg, "dumpbase"))
4174 dump_base_name = argv[1];
4178 decode_d_option (arg + 1);
4182 if (!strcmp (arg, "pedantic"))
4184 else if (!strcmp (arg, "pedantic-errors"))
4185 flag_pedantic_errors = pedantic = 1;
4186 else if (arg[1] == 0)
4193 if (!strcmp (arg, "quiet"))
4200 if (!strcmp (arg, "version"))
4208 inhibit_warnings = 1;
4217 /* We save the value of warn_uninitialized, since if they put
4218 -Wuninitialized on the command line, we need to generate a
4219 warning about not using it without also specifying -O. */
4220 if (warn_uninitialized != 1)
4221 warn_uninitialized = 2;
4224 return decode_W_option (arg + 1);
4228 if (!strncmp (arg, "aux-info", 8))
4235 aux_info_file_name = argv[1];
4236 flag_gen_aux_info = 1;
4239 else if (arg[8] == '=')
4241 aux_info_file_name = arg + 9;
4242 flag_gen_aux_info = 1;
4257 asm_file_name = argv[1];
4272 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4277 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4281 if (g_switch_val == -1)
4285 g_switch_set = TRUE;
4286 g_switch_value = g_switch_val;
4296 /* Decode -m switches. */
4297 /* Decode the switch -mNAME. */
4300 set_target_switch (name)
4304 int valid_target_option = 0;
4306 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4307 if (!strcmp (target_switches[j].name, name))
4309 if (target_switches[j].value < 0)
4310 target_flags &= ~-target_switches[j].value;
4312 target_flags |= target_switches[j].value;
4313 valid_target_option = 1;
4316 #ifdef TARGET_OPTIONS
4317 if (!valid_target_option)
4318 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4320 int len = strlen (target_options[j].prefix);
4321 if (!strncmp (target_options[j].prefix, name, len))
4323 *target_options[j].variable = name + len;
4324 valid_target_option = 1;
4329 if (!valid_target_option)
4330 error ("invalid option `%s'", name);
4333 /* Print version information to FILE.
4334 Each line begins with INDENT (for the case where FILE is the
4335 assembler output file). */
4338 print_version (file, indent)
4343 #define __VERSION__ "[?]"
4347 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4349 "%s%s%s version %s (%s) compiled by CC.\n"
4351 , indent, *indent != 0 ? " " : "",
4352 lang_hooks.name, version_string, TARGET_NAME,
4353 indent, __VERSION__);
4356 /* Print an option value and return the adjusted position in the line.
4357 ??? We don't handle error returns from fprintf (disk full); presumably
4358 other code will catch a disk full though. */
4361 print_single_switch (file, pos, max, indent, sep, term, type, name)
4364 const char *indent, *sep, *term, *type, *name;
4366 /* The ultrix fprintf returns 0 on success, so compute the result we want
4367 here since we need it for the following test. */
4368 int len = strlen (sep) + strlen (type) + strlen (name);
4373 fprintf (file, "%s", term);
4378 fprintf (file, "%s", indent);
4379 pos = strlen (indent);
4381 fprintf (file, "%s%s%s", sep, type, name);
4386 /* Print active target switches to FILE.
4387 POS is the current cursor position and MAX is the size of a "line".
4388 Each line begins with INDENT and ends with TERM.
4389 Each switch is separated from the next by SEP. */
4392 print_switch_values (file, pos, max, indent, sep, term)
4395 const char *indent, *sep, *term;
4400 /* Print the options as passed. */
4402 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4403 _("options passed: "), "");
4405 for (p = &save_argv[1]; *p != NULL; p++)
4409 if (strcmp (*p, "-o") == 0)
4415 if (strcmp (*p, "-quiet") == 0)
4417 if (strcmp (*p, "-version") == 0)
4422 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4425 fprintf (file, "%s", term);
4427 /* Print the -f and -m options that have been enabled.
4428 We don't handle language specific options but printing argv
4431 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4432 _("options enabled: "), "");
4434 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4435 if (*f_options[j].variable == f_options[j].on_value)
4436 pos = print_single_switch (file, pos, max, indent, sep, term,
4437 "-f", f_options[j].string);
4439 /* Print target specific options. */
4441 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4442 if (target_switches[j].name[0] != '\0'
4443 && target_switches[j].value > 0
4444 && ((target_switches[j].value & target_flags)
4445 == target_switches[j].value))
4447 pos = print_single_switch (file, pos, max, indent, sep, term,
4448 "-m", target_switches[j].name);
4451 #ifdef TARGET_OPTIONS
4452 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4453 if (*target_options[j].variable != NULL)
4456 sprintf (prefix, "-m%s", target_options[j].prefix);
4457 pos = print_single_switch (file, pos, max, indent, sep, term,
4458 prefix, *target_options[j].variable);
4462 fprintf (file, "%s", term);
4465 /* Open assembly code output file. Do this even if -fsyntax-only is
4466 on, because then the driver will have provided the name of a
4467 temporary file or bit bucket for us. NAME is the file specified on
4468 the command line, possibly NULL. */
4470 init_asm_output (name)
4473 if (name == NULL && asm_file_name == 0)
4474 asm_out_file = stdout;
4477 if (asm_file_name == 0)
4479 int len = strlen (dump_base_name);
4480 char *dumpname = (char *) xmalloc (len + 6);
4481 memcpy (dumpname, dump_base_name, len + 1);
4482 strip_off_ending (dumpname, len);
4483 strcat (dumpname, ".s");
4484 asm_file_name = dumpname;
4486 if (!strcmp (asm_file_name, "-"))
4487 asm_out_file = stdout;
4489 asm_out_file = fopen (asm_file_name, "w");
4490 if (asm_out_file == 0)
4491 fatal_io_error ("can't open %s for writing", asm_file_name);
4494 #ifdef IO_BUFFER_SIZE
4495 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4496 _IOFBF, IO_BUFFER_SIZE);
4499 if (!flag_syntax_only)
4501 #ifdef ASM_FILE_START
4502 ASM_FILE_START (asm_out_file);
4505 #ifdef ASM_COMMENT_START
4506 if (flag_verbose_asm)
4508 /* Print the list of options in effect. */
4509 print_version (asm_out_file, ASM_COMMENT_START);
4510 print_switch_values (asm_out_file, 0, MAX_LINE,
4511 ASM_COMMENT_START, " ", "\n");
4512 /* Add a blank line here so it appears in assembler output but not
4514 fprintf (asm_out_file, "\n");
4520 /* Initialization of the front end environment, before command line
4521 options are parsed. Signal handlers, internationalization etc.
4522 ARGV0 is main's argv[0]. */
4524 general_init (argv0)
4529 p = argv0 + strlen (argv0);
4530 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4534 xmalloc_set_program_name (progname);
4536 gcc_init_libintl ();
4538 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4540 signal (SIGSEGV, crash_signal);
4543 signal (SIGILL, crash_signal);
4546 signal (SIGBUS, crash_signal);
4549 signal (SIGABRT, crash_signal);
4551 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4552 signal (SIGIOT, crash_signal);
4555 signal (SIGFPE, crash_signal);
4558 /* Initialize the diagnostics reporting machinery, so option parsing
4559 can give warnings and errors. */
4560 diagnostic_initialize (global_dc);
4563 /* Parse command line options and set default flag values, called
4564 after language-independent option-independent initialization. Do
4565 minimal options processing. Outputting diagnostics is OK, but GC
4566 and identifier hashtables etc. are not initialized yet. */
4568 parse_options_and_default_flags (argc, argv)
4574 /* Save in case md file wants to emit args as a comment. */
4578 /* Initialize register usage now so switches may override. */
4581 /* Register the language-independent parameters. */
4582 add_params (lang_independent_params, LAST_PARAM);
4584 /* Perform language-specific options initialization. */
4585 (*lang_hooks.init_options) ();
4587 /* Scan to see what optimization level has been specified. That will
4588 determine the default value of many flags. */
4589 for (i = 1; i < argc; i++)
4591 if (!strcmp (argv[i], "-O"))
4596 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4598 /* Handle -Os, -O2, -O3, -O69, ... */
4599 char *p = &argv[i][2];
4601 if ((p[0] == 's') && (p[1] == 0))
4605 /* Optimizing for size forces optimize to be 2. */
4610 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4611 if (optimize_val != -1)
4613 optimize = optimize_val;
4622 flag_merge_constants = 0;
4628 flag_thread_jumps = 1;
4630 flag_delayed_branch = 1;
4632 #ifdef CAN_DEBUG_WITHOUT_FP
4633 flag_omit_frame_pointer = 1;
4635 flag_guess_branch_prob = 1;
4636 flag_cprop_registers = 1;
4637 flag_loop_optimize = 1;
4638 flag_crossjumping = 1;
4639 flag_if_conversion = 1;
4640 flag_if_conversion2 = 1;
4645 flag_optimize_sibling_calls = 1;
4646 flag_cse_follow_jumps = 1;
4647 flag_cse_skip_blocks = 1;
4649 flag_expensive_optimizations = 1;
4650 flag_strength_reduce = 1;
4651 flag_rerun_cse_after_loop = 1;
4652 flag_rerun_loop_opt = 1;
4653 flag_caller_saves = 1;
4656 #ifdef INSN_SCHEDULING
4657 flag_schedule_insns = 1;
4658 flag_schedule_insns_after_reload = 1;
4661 flag_strict_aliasing = 1;
4662 flag_delete_null_pointer_checks = 1;
4663 flag_reorder_blocks = 1;
4668 flag_inline_functions = 1;
4669 flag_rename_registers = 1;
4672 if (optimize < 2 || optimize_size)
4677 align_functions = 1;
4680 /* Initialize whether `char' is signed. */
4681 flag_signed_char = DEFAULT_SIGNED_CHAR;
4682 #ifdef DEFAULT_SHORT_ENUMS
4683 /* Initialize how much space enums occupy, by default. */
4684 flag_short_enums = DEFAULT_SHORT_ENUMS;
4687 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4690 set_target_switch ("");
4692 /* Unwind tables are always present in an ABI-conformant IA-64
4693 object file, so the default should be ON. */
4694 #ifdef IA64_UNWIND_INFO
4695 flag_unwind_tables = IA64_UNWIND_INFO;
4698 #ifdef OPTIMIZATION_OPTIONS
4699 /* Allow default optimizations to be specified on a per-machine basis. */
4700 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4703 /* Perform normal command line switch decoding. */
4704 for (i = 1; i < argc;)
4707 int indep_processed;
4709 /* Give the language a chance to decode the option for itself. */
4710 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4712 if (lang_processed >= 0)
4713 /* Now see if the option also has a language independent meaning.
4714 Some options are both language specific and language independent,
4716 indep_processed = independent_decode_option (argc - i, argv + i);
4719 lang_processed = -lang_processed;
4720 indep_processed = 0;
4723 if (lang_processed || indep_processed)
4724 i += MAX (lang_processed, indep_processed);
4727 const char *option = NULL;
4728 const char *lang = NULL;
4731 /* It is possible that the command line switch is not valid for the
4732 current language, but it is valid for another language. In order
4733 to be compatible with previous versions of the compiler (which
4734 did not issue an error message in this case) we check for this
4735 possibility here. If we do find a match, then if extra_warnings
4736 is set we generate a warning message, otherwise we will just
4737 ignore the option. */
4738 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4740 option = documented_lang_options[j].option;
4743 lang = documented_lang_options[j].description;
4744 else if (! strncmp (argv[i], option, strlen (option)))
4748 if (j != ARRAY_SIZE (documented_lang_options))
4752 warning ("ignoring command line option '%s'", argv[i]);
4755 ("(it is valid for %s but not the selected language)",
4759 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4760 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4762 error ("unrecognized option `%s'", argv[i]);
4768 if (flag_no_inline == 2)
4771 flag_really_no_inline = flag_no_inline;
4773 /* Set flag_no_inline before the post_options () hook. The C front
4774 ends use it to determine tree inlining defaults. FIXME: such
4775 code should be lang-independent when all front ends use tree
4776 inlining, in which case it, and this condition, should be moved
4777 to the top of process_options() instead. */
4780 /* Inlining does not work if not optimizing,
4781 so force it not to be done. */
4785 /* The c_decode_option function and decode_option hook set
4786 this to `2' if -Wall is used, so we can avoid giving out
4787 lots of errors for people who don't realize what -Wall does. */
4788 if (warn_uninitialized == 1)
4789 warning ("-Wuninitialized is not supported without -O");
4792 if (flag_really_no_inline == 2)
4793 flag_really_no_inline = flag_no_inline;
4795 /* All command line options have been parsed; allow the front end to
4796 perform consistency checks, etc. */
4797 (*lang_hooks.post_options) ();
4800 /* Process the options that have been parsed. */
4804 #ifdef OVERRIDE_OPTIONS
4805 /* Some machines may reject certain combinations of options. */
4809 /* Set up the align_*_log variables, defaulting them to 1 if they
4810 were still unset. */
4811 if (align_loops <= 0) align_loops = 1;
4812 if (align_loops_max_skip > align_loops || !align_loops)
4813 align_loops_max_skip = align_loops - 1;
4814 align_loops_log = floor_log2 (align_loops * 2 - 1);
4815 if (align_jumps <= 0) align_jumps = 1;
4816 if (align_jumps_max_skip > align_jumps || !align_jumps)
4817 align_jumps_max_skip = align_jumps - 1;
4818 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4819 if (align_labels <= 0) align_labels = 1;
4820 align_labels_log = floor_log2 (align_labels * 2 - 1);
4821 if (align_labels_max_skip > align_labels || !align_labels)
4822 align_labels_max_skip = align_labels - 1;
4823 if (align_functions <= 0) align_functions = 1;
4824 align_functions_log = floor_log2 (align_functions * 2 - 1);
4826 /* Unrolling all loops implies that standard loop unrolling must also
4828 if (flag_unroll_all_loops)
4829 flag_unroll_loops = 1;
4830 /* Loop unrolling requires that strength_reduction be on also. Silently
4831 turn on strength reduction here if it isn't already on. Also, the loop
4832 unrolling code assumes that cse will be run after loop, so that must
4833 be turned on also. */
4834 if (flag_unroll_loops)
4836 flag_strength_reduce = 1;
4837 flag_rerun_cse_after_loop = 1;
4840 if (flag_non_call_exceptions)
4841 flag_asynchronous_unwind_tables = 1;
4842 if (flag_asynchronous_unwind_tables)
4843 flag_unwind_tables = 1;
4845 /* Warn about options that are not supported on this machine. */
4846 #ifndef INSN_SCHEDULING
4847 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4848 warning ("instruction scheduling not supported on this target machine");
4851 if (flag_delayed_branch)
4852 warning ("this target machine does not have delayed branches");
4855 /* Some operating systems do not allow profiling without a frame
4857 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4859 && flag_omit_frame_pointer)
4861 error ("profiling does not work without a frame pointer");
4862 flag_omit_frame_pointer = 0;
4865 user_label_prefix = USER_LABEL_PREFIX;
4866 if (flag_leading_underscore != -1)
4868 /* If the default prefix is more complicated than "" or "_",
4869 issue a warning and ignore this option. */
4870 if (user_label_prefix[0] == 0 ||
4871 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4873 user_label_prefix = flag_leading_underscore ? "_" : "";
4876 warning ("-f%sleading-underscore not supported on this target machine",
4877 flag_leading_underscore ? "" : "no-");
4880 /* If we are in verbose mode, write out the version and maybe all the
4881 option flags in use. */
4884 print_version (stderr, "");
4886 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4892 if (flag_syntax_only)
4894 write_symbols = NO_DEBUG;
4898 /* Now we know write_symbols, set up the debug hooks based on it.
4899 By default we do nothing for debug output. */
4900 #if defined(DBX_DEBUGGING_INFO)
4901 if (write_symbols == DBX_DEBUG)
4902 debug_hooks = &dbx_debug_hooks;
4904 #if defined(XCOFF_DEBUGGING_INFO)
4905 if (write_symbols == XCOFF_DEBUG)
4906 debug_hooks = &xcoff_debug_hooks;
4908 #ifdef SDB_DEBUGGING_INFO
4909 if (write_symbols == SDB_DEBUG)
4910 debug_hooks = &sdb_debug_hooks;
4912 #ifdef DWARF_DEBUGGING_INFO
4913 if (write_symbols == DWARF_DEBUG)
4914 debug_hooks = &dwarf_debug_hooks;
4916 #ifdef DWARF2_DEBUGGING_INFO
4917 if (write_symbols == DWARF2_DEBUG)
4918 debug_hooks = &dwarf2_debug_hooks;
4920 #ifdef VMS_DEBUGGING_INFO
4921 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4922 debug_hooks = &vmsdbg_debug_hooks;
4925 /* If auxiliary info generation is desired, open the output file.
4926 This goes in the same directory as the source file--unlike
4927 all the other output files. */
4928 if (flag_gen_aux_info)
4930 aux_info_file = fopen (aux_info_file_name, "w");
4931 if (aux_info_file == 0)
4932 fatal_io_error ("can't open %s", aux_info_file_name);
4935 if (! targetm.have_named_sections)
4937 if (flag_function_sections)
4939 warning ("-ffunction-sections not supported for this target");
4940 flag_function_sections = 0;
4942 if (flag_data_sections)
4944 warning ("-fdata-sections not supported for this target");
4945 flag_data_sections = 0;
4949 if (flag_function_sections && profile_flag)
4951 warning ("-ffunction-sections disabled; it makes profiling impossible");
4952 flag_function_sections = 0;
4955 #ifndef HAVE_prefetch
4956 if (flag_prefetch_loop_arrays)
4958 warning ("-fprefetch-loop-arrays not supported for this target");
4959 flag_prefetch_loop_arrays = 0;
4962 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4964 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4965 flag_prefetch_loop_arrays = 0;
4969 /* This combination of options isn't handled for i386 targets and doesn't
4970 make much sense anyway, so don't allow it. */
4971 if (flag_prefetch_loop_arrays && optimize_size)
4973 warning ("-fprefetch-loop-arrays is not supported with -Os");
4974 flag_prefetch_loop_arrays = 0;
4977 #ifndef OBJECT_FORMAT_ELF
4978 if (flag_function_sections && write_symbols != NO_DEBUG)
4979 warning ("-ffunction-sections may affect debugging on some targets");
4983 /* Language-independent initialization, before language-dependent
4986 lang_independent_init ()
4988 /* Initialize the garbage-collector, and string pools. */
4990 ggc_add_rtx_root (&stack_limit_rtx, 1);
4991 ggc_add_tree_root (¤t_function_decl, 1);
4992 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4997 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4998 || debug_info_level == DINFO_LEVEL_VERBOSE
4999 #ifdef VMS_DEBUGGING_INFO
5000 /* Enable line number info for traceback */
5001 || debug_info_level > DINFO_LEVEL_NONE
5003 || flag_test_coverage
5004 || warn_notreached);
5010 init_function_once ();
5011 init_stor_layout_once ();
5012 init_varasm_once ();
5013 init_EXPR_INSN_LIST_cache ();
5015 /* The following initialization functions need to generate rtl, so
5016 provide a dummy function context for them. */
5017 init_dummy_function_start ();
5020 if (flag_caller_saves)
5021 init_caller_save ();
5022 expand_dummy_function_end ();
5025 /* Language-dependent initialization. Returns non-zero on success. */
5027 lang_dependent_init (name)
5030 if (dump_base_name == 0)
5031 dump_base_name = name ? name : "gccdump";
5033 /* Front-end initialization. This hook can assume that GC,
5034 identifier hashes etc. are set up, but debug initialization is
5035 not done yet. This routine must return the original filename
5036 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5037 name = (*lang_hooks.init) (name);
5041 /* Is this duplication necessary? */
5042 name = ggc_strdup (name);
5043 main_input_filename = input_filename = name;
5044 init_asm_output (name);
5046 /* These create various _DECL nodes, so need to be called after the
5047 front end is initialized. */
5051 /* Put an entry on the input file stack for the main input file. */
5052 push_srcloc (input_filename, 0);
5054 /* If dbx symbol table desired, initialize writing it and output the
5055 predefined types. */
5056 timevar_push (TV_SYMOUT);
5058 #ifdef DWARF2_UNWIND_INFO
5059 if (dwarf2out_do_frame ())
5060 dwarf2out_frame_init ();
5063 /* Now we have the correct original filename, we can initialize
5065 (*debug_hooks->init) (name);
5067 timevar_pop (TV_SYMOUT);
5072 /* Clean up: close opened files, etc. */
5077 /* Close the dump files. */
5078 if (flag_gen_aux_info)
5080 fclose (aux_info_file);
5082 unlink (aux_info_file_name);
5085 /* Close non-debugging input and output files. Take special care to note
5086 whether fclose returns an error, since the pages might still be on the
5087 buffer chain while the file is open. */
5091 if (ferror (asm_out_file) != 0)
5092 fatal_io_error ("error writing to %s", asm_file_name);
5093 if (fclose (asm_out_file) != 0)
5094 fatal_io_error ("error closing %s", asm_file_name);
5097 /* Do whatever is necessary to finish printing the graphs. */
5098 if (graph_dump_format != no_graph)
5102 for (i = 0; i < (int) DFI_MAX; ++i)
5103 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5108 sprintf (seq, DUMPFILE_FORMAT, i);
5109 suffix = concat (seq, dump_file[i].extension, NULL);
5110 finish_graph_dump_file (dump_base_name, suffix);
5117 ggc_print_statistics ();
5118 stringpool_statistics ();
5119 dump_tree_statistics ();
5122 /* Free up memory for the benefit of leak detectors. */
5125 /* Language-specific end of compilation actions. */
5126 (*lang_hooks.finish) ();
5129 /* Initialize the compiler, and compile the input file. */
5133 /* The bulk of command line switch processing. */
5136 /* We cannot start timing until after options are processed since that
5137 says if we run timers or not. */
5139 timevar_start (TV_TOTAL);
5141 /* Language-independent initialization. Also sets up GC, identifier
5143 lang_independent_init ();
5145 /* Language-dependent initialization. Returns true on success. */
5146 if (lang_dependent_init (filename))
5151 /* Stop timing and print the times. */
5152 timevar_stop (TV_TOTAL);
5153 timevar_print (stderr);
5156 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5157 Decode command args, then call compile_file.
5158 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5159 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5161 It is not safe to call this function more than once. */
5164 toplev_main (argc, argv)
5170 /* Initialization of GCC's environment, and diagnostics. */
5171 general_init (argv[0]);
5173 /* Parse the options and do minimal processing; basically just
5174 enough to default flags appropriately. */
5175 parse_options_and_default_flags (argc, argv);
5177 /* Exit early if we can (e.g. -help). */
5178 if (!exit_after_options)
5181 if (errorcount || sorrycount)
5182 return (FATAL_EXIT_CODE);
5184 return (SUCCESS_EXIT_CODE);