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 functions should be reordered. */
386 int flag_reorder_functions = 0;
388 /* Nonzero if registers should be renamed. */
390 int flag_rename_registers = 0;
391 int flag_cprop_registers = 0;
393 /* Nonzero for -pedantic switch: warn about anything
394 that standard spec forbids. */
398 /* Temporarily suppress certain warnings.
399 This is set while reading code from a system header file. */
401 int in_system_header = 0;
403 /* Don't print functions as they are compiled. -quiet. */
407 /* Print times taken by the various passes. -ftime-report. */
411 /* Print memory still in use at end of compilation (which may have little
412 to do with peak memory consumption). -fmem-report. */
416 /* Non-zero means to collect statistics which might be expensive
417 and to print them when we are done. */
418 int flag_detailed_statistics = 0;
423 /* Nonzero means `char' should be signed. */
425 int flag_signed_char;
427 /* Nonzero means give an enum type only as many bytes as it needs. */
429 int flag_short_enums;
431 /* Nonzero for -fcaller-saves: allocate values in regs that need to
432 be saved across function calls, if that produces overall better code.
433 Optional now, so people can test it. */
435 #ifdef DEFAULT_CALLER_SAVES
436 int flag_caller_saves = 1;
438 int flag_caller_saves = 0;
441 /* Nonzero if structures and unions should be returned in memory.
443 This should only be defined if compatibility with another compiler or
444 with an ABI is needed, because it results in slower code. */
446 #ifndef DEFAULT_PCC_STRUCT_RETURN
447 #define DEFAULT_PCC_STRUCT_RETURN 1
450 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
452 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
454 /* Nonzero for -fforce-mem: load memory value into a register
455 before arithmetic on it. This makes better cse but slower compilation. */
457 int flag_force_mem = 0;
459 /* Nonzero for -fforce-addr: load memory address into a register before
460 reference to memory. This makes better cse but slower compilation. */
462 int flag_force_addr = 0;
464 /* Nonzero for -fdefer-pop: don't pop args after each function call;
465 instead save them up to pop many calls' args with one insns. */
467 int flag_defer_pop = 0;
469 /* Nonzero for -ffloat-store: don't allocate floats and doubles
470 in extended-precision registers. */
472 int flag_float_store = 0;
474 /* Nonzero for -fcse-follow-jumps:
475 have cse follow jumps to do a more extensive job. */
477 int flag_cse_follow_jumps;
479 /* Nonzero for -fcse-skip-blocks:
480 have cse follow a branch around a block. */
481 int flag_cse_skip_blocks;
483 /* Nonzero for -fexpensive-optimizations:
484 perform miscellaneous relatively-expensive optimizations. */
485 int flag_expensive_optimizations;
487 /* Nonzero for -fthread-jumps:
488 have jump optimize output of loop. */
490 int flag_thread_jumps;
492 /* Nonzero enables strength-reduction in loop.c. */
494 int flag_strength_reduce = 0;
496 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
497 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
498 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
501 int flag_unroll_loops;
503 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
504 This is generally not a win. */
506 int flag_unroll_all_loops;
508 /* Nonzero enables prefetch optimizations for arrays in loops. */
510 int flag_prefetch_loop_arrays;
512 /* Nonzero forces all invariant computations in loops to be moved
515 int flag_move_all_movables = 0;
517 /* Nonzero forces all general induction variables in loops to be
520 int flag_reduce_all_givs = 0;
522 /* Nonzero to perform full register move optimization passes. This is the
525 int flag_regmove = 0;
527 /* Nonzero for -fwritable-strings:
528 store string constants in data segment and don't uniquize them. */
530 int flag_writable_strings = 0;
532 /* Nonzero means don't put addresses of constant functions in registers.
533 Used for compiling the Unix kernel, where strange substitutions are
534 done on the assembly output. */
536 int flag_no_function_cse = 0;
538 /* Nonzero for -fomit-frame-pointer:
539 don't make a frame pointer in simple functions that don't require one. */
541 int flag_omit_frame_pointer = 0;
543 /* Nonzero means place each function into its own section on those platforms
544 which support arbitrary section names and unlimited numbers of sections. */
546 int flag_function_sections = 0;
548 /* ... and similar for data. */
550 int flag_data_sections = 0;
552 /* Nonzero to inhibit use of define_optimization peephole opts. */
554 int flag_no_peephole = 0;
556 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
558 int flag_optimize_sibling_calls = 0;
560 /* Nonzero means the front end generally wants `errno' maintained by math
561 operations, like built-in SQRT. */
563 int flag_errno_math = 1;
565 /* Nonzero means that unsafe floating-point math optimizations are allowed
566 for the sake of speed. IEEE compliance is not guaranteed, and operations
567 are allowed to assume that their arguments and results are "normal"
568 (e.g., nonnegative for SQRT). */
570 int flag_unsafe_math_optimizations = 0;
572 /* Zero means that floating-point math operations cannot generate a
573 (user-visible) trap. This is the case, for example, in nonstop
574 IEEE 754 arithmetic. */
576 int flag_trapping_math = 1;
578 /* 0 means straightforward implementation of complex divide acceptable.
579 1 means wide ranges of inputs must work for complex divide.
580 2 means C99-like requirements for complex divide (not yet implemented). */
582 int flag_complex_divide_method = 0;
584 /* Nonzero means all references through pointers are volatile. */
588 /* Nonzero means treat all global and extern variables as volatile. */
590 int flag_volatile_global;
592 /* Nonzero means treat all static variables as volatile. */
594 int flag_volatile_static;
596 /* Nonzero means just do syntax checking; don't output anything. */
598 int flag_syntax_only = 0;
600 /* Nonzero means perform global cse. */
602 static int flag_gcse;
604 /* Nonzero means perform loop optimizer. */
606 static int flag_loop_optimize;
608 /* Nonzero means perform crossjumping. */
610 static int flag_crossjumping;
612 /* Nonzero means perform if conversion. */
614 static int flag_if_conversion;
616 /* Nonzero means perform if conversion after reload. */
618 static int flag_if_conversion2;
620 /* Nonzero means to use global dataflow analysis to eliminate
621 useless null pointer tests. */
623 static int flag_delete_null_pointer_checks;
625 /* Nonzero means to do the enhanced load motion during gcse, which trys
626 to hoist loads by not killing them when a store to the same location
629 int flag_gcse_lm = 1;
631 /* Nonzero means to perform store motion after gcse, which will try to
632 move stores closer to the exit block. Its not very effective without
635 int flag_gcse_sm = 1;
637 /* Nonzero means to rerun cse after loop optimization. This increases
638 compilation time about 20% and picks up a few more common expressions. */
640 static int flag_rerun_cse_after_loop;
642 /* Nonzero means to run loop optimizations twice. */
644 int flag_rerun_loop_opt;
646 /* Nonzero for -finline-functions: ok to inline functions that look like
647 good inline candidates. */
649 int flag_inline_functions;
651 /* Nonzero for -fkeep-inline-functions: even if we make a function
652 go inline everywhere, keep its definition around for debugging
655 int flag_keep_inline_functions;
657 /* Nonzero means that functions will not be inlined. */
659 int flag_no_inline = 2;
661 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
662 not just because the tree inliner turned us off. */
664 int flag_really_no_inline = 2;
666 /* Nonzero means that we should emit static const variables
667 regardless of whether or not optimization is turned on. */
669 int flag_keep_static_consts = 1;
671 /* Nonzero means we should be saving declaration info into a .X file. */
673 int flag_gen_aux_info = 0;
675 /* Specified name of aux-info file. */
677 static char *aux_info_file_name;
679 /* Nonzero means make the text shared if supported. */
681 int flag_shared_data;
683 /* Nonzero means schedule into delayed branch slots if supported. */
685 int flag_delayed_branch;
687 /* Nonzero if we are compiling pure (sharable) code.
688 Value is 1 if we are doing reasonable (i.e. simple
689 offset into offset table) pic. Value is 2 if we can
690 only perform register offsets. */
694 /* Nonzero means generate extra code for exception handling and enable
695 exception handling. */
699 /* Nonzero means generate frame unwind info table when supported. */
701 int flag_unwind_tables = 0;
703 /* Nonzero means generate frame unwind info table exact at each insn boundary */
705 int flag_asynchronous_unwind_tables = 0;
707 /* Nonzero means don't place uninitialized global data in common storage
712 /* Nonzero means change certain warnings into errors.
713 Usually these are warnings about failure to conform to some standard. */
715 int flag_pedantic_errors = 0;
717 /* flag_schedule_insns means schedule insns within basic blocks (before
719 flag_schedule_insns_after_reload means schedule insns after
722 int flag_schedule_insns = 0;
723 int flag_schedule_insns_after_reload = 0;
725 /* The following flags have effect only for scheduling before register
728 flag_schedule_interblock means schedule insns accross basic blocks.
729 flag_schedule_speculative means allow speculative motion of non-load insns.
730 flag_schedule_speculative_load means allow speculative motion of some
732 flag_schedule_speculative_load_dangerous allows speculative motion of more
735 int flag_schedule_interblock = 1;
736 int flag_schedule_speculative = 1;
737 int flag_schedule_speculative_load = 0;
738 int flag_schedule_speculative_load_dangerous = 0;
740 int flag_single_precision_constant;
742 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
743 by a cheaper branch on a count register. */
744 int flag_branch_on_count_reg = 1;
746 /* -finhibit-size-directive inhibits output of .size for ELF.
747 This is used only for compiling crtstuff.c,
748 and it may be extended to other effects
749 needed for crtstuff.c on other systems. */
750 int flag_inhibit_size_directive = 0;
752 /* -fverbose-asm causes extra commentary information to be produced in
753 the generated assembly code (to make it more readable). This option
754 is generally only of use to those who actually need to read the
755 generated assembly code (perhaps while debugging the compiler itself).
756 -fno-verbose-asm, the default, causes the extra information
757 to be omitted and is useful when comparing two assembler files. */
759 int flag_verbose_asm = 0;
761 /* -dA causes debug commentary information to be produced in
762 the generated assembly code (to make it more readable). This option
763 is generally only of use to those who actually need to read the
764 generated assembly code (perhaps while debugging the compiler itself).
765 Currently, this switch is only used by dwarfout.c; however, it is intended
766 to be a catchall for printing debug information in the assembler file. */
768 int flag_debug_asm = 0;
770 /* -dP causes the rtl to be emitted as a comment in assembly. */
772 int flag_dump_rtl_in_asm = 0;
774 /* -fgnu-linker specifies use of the GNU linker for initializations.
775 (Or, more generally, a linker that handles initializations.)
776 -fno-gnu-linker says that collect2 will be used. */
778 int flag_gnu_linker = 0;
780 int flag_gnu_linker = 1;
783 /* Nonzero means put zero initialized data in the bss section. */
784 int flag_zero_initialized_in_bss = 1;
789 /* Enable ssa conditional constant propagation. */
790 int flag_ssa_ccp = 0;
792 /* Enable ssa aggressive dead code elimination. */
793 int flag_ssa_dce = 0;
795 /* Tag all structures with __attribute__(packed). */
796 int flag_pack_struct = 0;
798 /* Emit code to check for stack overflow; also may cause large objects
799 to be allocated dynamically. */
800 int flag_stack_check;
802 /* When non-NULL, indicates that whenever space is allocated on the
803 stack, the resulting stack pointer must not pass this
804 address---that is, for stacks that grow downward, the stack pointer
805 must always be greater than or equal to this address; for stacks
806 that grow upward, the stack pointer must be less than this address.
807 At present, the rtx may be either a REG or a SYMBOL_REF, although
808 the support provided depends on the backend. */
811 /* 0 if pointer arguments may alias each other. True in C.
812 1 if pointer arguments may not alias each other but may alias
814 2 if pointer arguments may not alias each other and may not
815 alias global variables. True in Fortran.
816 This defaults to 0 for C. */
817 int flag_argument_noalias = 0;
819 /* Nonzero if we should do (language-dependent) alias analysis.
820 Typically, this analysis will assume that expressions of certain
821 types do not alias expressions of certain other types. Only used
822 if alias analysis (in general) is enabled. */
823 int flag_strict_aliasing = 0;
825 /* Instrument functions with calls at entry and exit, for profiling. */
826 int flag_instrument_function_entry_exit = 0;
828 /* Nonzero means ignore `#ident' directives. 0 means handle them.
829 On SVR4 targets, it also controls whether or not to emit a
830 string identifying the compiler. */
832 int flag_no_ident = 0;
834 /* This will perform a peephole pass before sched2. */
835 int flag_peephole2 = 0;
837 /* This will try to guess branch probabilities. */
838 int flag_guess_branch_prob = 0;
840 /* -fbounded-pointers causes gcc to compile pointers as composite
841 objects occupying three words: the pointer value, the base address
842 of the referent object, and the address immediately beyond the end
843 of the referent object. The base and extent allow us to perform
844 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
845 int flag_bounded_pointers = 0;
847 /* -fcheck-bounds causes gcc to generate array bounds checks.
848 For C, C++: defaults to value of flag_bounded_pointers.
849 For ObjC: defaults to off.
850 For Java: defaults to on.
851 For Fortran: defaults to off.
852 For CHILL: defaults to off. */
853 int flag_bounds_check = 0;
855 /* This will attempt to merge constant section constants, if 1 only
856 string constants and constants from constant pool, if 2 also constant
858 int flag_merge_constants = 1;
860 /* If one, renumber instruction UIDs to reduce the number of
861 unused UIDs if there are a lot of instructions. If greater than
862 one, unconditionally renumber instruction UIDs. */
863 int flag_renumber_insns = 1;
865 /* Values of the -falign-* flags: how much to align labels in code.
866 0 means `use default', 1 means `don't align'.
867 For each variable, there is an _log variant which is the power
868 of two not less than the variable, for .align output. */
872 int align_loops_max_skip;
875 int align_jumps_max_skip;
877 int align_labels_log;
878 int align_labels_max_skip;
880 int align_functions_log;
882 /* Table of supported debugging formats. */
885 const char *const arg;
886 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
887 constant expression, we use NO_DEBUG in its place. */
888 const enum debug_info_type debug_type;
889 const int use_extensions_p;
890 const char *const description;
894 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
895 N_("Generate debugging info in default format") },
896 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
897 #ifdef DBX_DEBUGGING_INFO
898 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
899 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
901 #ifdef DWARF_DEBUGGING_INFO
902 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
903 { "dwarf+", DWARF_DEBUG, 1,
904 N_("Generate extended DWARF-1 format debug info") },
906 #ifdef DWARF2_DEBUGGING_INFO
907 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
909 #ifdef XCOFF_DEBUGGING_INFO
910 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
911 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
913 #ifdef SDB_DEBUGGING_INFO
914 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
916 #ifdef VMS_DEBUGGING_INFO
917 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
924 const char *const string;
927 const char *const description;
929 lang_independent_options;
933 /* Add or remove a leading underscore from user symbols. */
934 int flag_leading_underscore = -1;
936 /* The user symbol prefix after having resolved same. */
937 const char *user_label_prefix;
939 static const param_info lang_independent_params[] = {
940 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
941 { OPTION, DEFAULT, HELP },
942 #include "params.def"
947 /* A default for same. */
948 #ifndef USER_LABEL_PREFIX
949 #define USER_LABEL_PREFIX ""
952 /* Table of language-independent -f options.
953 STRING is the option name. VARIABLE is the address of the variable.
954 ON_VALUE is the value to store in VARIABLE
955 if `-fSTRING' is seen as an option.
956 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
958 static const lang_independent_options f_options[] =
960 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
961 N_("Perform DWARF2 duplicate elimination") },
962 {"float-store", &flag_float_store, 1,
963 N_("Do not store floats in registers") },
964 {"volatile", &flag_volatile, 1,
965 N_("Consider all mem refs through pointers as volatile") },
966 {"volatile-global", &flag_volatile_global, 1,
967 N_("Consider all mem refs to global data to be volatile") },
968 {"volatile-static", &flag_volatile_static, 1,
969 N_("Consider all mem refs to static data to be volatile") },
970 {"defer-pop", &flag_defer_pop, 1,
971 N_("Defer popping functions args from stack until later") },
972 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
973 N_("When possible do not generate stack frames") },
974 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
975 N_("Optimize sibling and tail recursive calls") },
976 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
977 N_("When running CSE, follow jumps to their targets") },
978 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
979 N_("When running CSE, follow conditional jumps") },
980 {"expensive-optimizations", &flag_expensive_optimizations, 1,
981 N_("Perform a number of minor, expensive optimizations") },
982 {"thread-jumps", &flag_thread_jumps, 1,
983 N_("Perform jump threading optimizations") },
984 {"strength-reduce", &flag_strength_reduce, 1,
985 N_("Perform strength reduction optimizations") },
986 {"unroll-loops", &flag_unroll_loops, 1,
987 N_("Perform loop unrolling when iteration count is known") },
988 {"unroll-all-loops", &flag_unroll_all_loops, 1,
989 N_("Perform loop unrolling for all loops") },
990 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
991 N_("Generate prefetch instructions, if available, for arrays in loops") },
992 {"move-all-movables", &flag_move_all_movables, 1,
993 N_("Force all loop invariant computations out of loops") },
994 {"reduce-all-givs", &flag_reduce_all_givs, 1,
995 N_("Strength reduce all loop general induction variables") },
996 {"writable-strings", &flag_writable_strings, 1,
997 N_("Store strings in writable data section") },
998 {"peephole", &flag_no_peephole, 0,
999 N_("Enable machine specific peephole optimizations") },
1000 {"force-mem", &flag_force_mem, 1,
1001 N_("Copy memory operands into registers before using") },
1002 {"force-addr", &flag_force_addr, 1,
1003 N_("Copy memory address constants into regs before using") },
1004 {"function-cse", &flag_no_function_cse, 0,
1005 N_("Allow function addresses to be held in registers") },
1006 {"inline-functions", &flag_inline_functions, 1,
1007 N_("Integrate simple functions into their callers") },
1008 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1009 N_("Generate code for funcs even if they are fully inlined") },
1010 {"inline", &flag_no_inline, 0,
1011 N_("Pay attention to the 'inline' keyword") },
1012 {"keep-static-consts", &flag_keep_static_consts, 1,
1013 N_("Emit static const variables even if they are not used") },
1014 {"syntax-only", &flag_syntax_only, 1,
1015 N_("Check for syntax errors, then stop") },
1016 {"shared-data", &flag_shared_data, 1,
1017 N_("Mark data as shared rather than private") },
1018 {"caller-saves", &flag_caller_saves, 1,
1019 N_("Enable saving registers around function calls") },
1020 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1021 N_("Return 'short' aggregates in memory, not registers") },
1022 {"reg-struct-return", &flag_pcc_struct_return, 0,
1023 N_("Return 'short' aggregates in registers") },
1024 {"delayed-branch", &flag_delayed_branch, 1,
1025 N_("Attempt to fill delay slots of branch instructions") },
1026 {"gcse", &flag_gcse, 1,
1027 N_("Perform the global common subexpression elimination") },
1028 {"gcse-lm", &flag_gcse_lm, 1,
1029 N_("Perform enhanced load motion during global subexpression elimination") },
1030 {"gcse-sm", &flag_gcse_sm, 1,
1031 N_("Perform store motion after global subexpression elimination") },
1032 {"loop-optimize", &flag_loop_optimize, 1,
1033 N_("Perform the loop optimizations") },
1034 {"crossjumping", &flag_crossjumping, 1,
1035 N_("Perform cross-jumping optimization") },
1036 {"if-conversion", &flag_if_conversion, 1,
1037 N_("Perform conversion of conditional jumps to branchless equivalents") },
1038 {"if-conversion2", &flag_if_conversion2, 1,
1039 N_("Perform conversion of conditional jumps to conditional execution") },
1040 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1041 N_("Run CSE pass after loop optimizations") },
1042 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1043 N_("Run the loop optimizer twice") },
1044 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1045 N_("Delete useless null pointer checks") },
1046 {"schedule-insns", &flag_schedule_insns, 1,
1047 N_("Reschedule instructions before register allocation") },
1048 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1049 N_("Reschedule instructions after register allocation") },
1050 {"sched-interblock",&flag_schedule_interblock, 1,
1051 N_("Enable scheduling across basic blocks") },
1052 {"sched-spec",&flag_schedule_speculative, 1,
1053 N_("Allow speculative motion of non-loads") },
1054 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1055 N_("Allow speculative motion of some loads") },
1056 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1057 N_("Allow speculative motion of more loads") },
1058 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1059 N_("Replace add,compare,branch with branch on count reg") },
1060 {"pic", &flag_pic, 1,
1061 N_("Generate position independent code, if possible") },
1062 {"PIC", &flag_pic, 2, ""},
1063 {"exceptions", &flag_exceptions, 1,
1064 N_("Enable exception handling") },
1065 {"unwind-tables", &flag_unwind_tables, 1,
1066 N_("Just generate unwind tables for exception handling") },
1067 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1068 N_("Generate unwind tables exact at each instruction boundary") },
1069 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1070 N_("Support synchronous non-call exceptions") },
1071 {"profile-arcs", &profile_arc_flag, 1,
1072 N_("Insert arc based program profiling code") },
1073 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs, 1,
1074 N_("Avoid thread safety profiling overhead") },
1075 {"test-coverage", &flag_test_coverage, 1,
1076 N_("Create data files needed by gcov") },
1077 {"branch-probabilities", &flag_branch_probabilities, 1,
1078 N_("Use profiling information for branch probabilities") },
1079 {"profile", &profile_flag, 1,
1080 N_("Enable basic program profiling code") },
1081 {"reorder-blocks", &flag_reorder_blocks, 1,
1082 N_("Reorder basic blocks to improve code placement") },
1083 {"reorder-functions", &flag_reorder_functions, 1,
1084 N_("Reorder functions to improve code placement") },
1085 {"rename-registers", &flag_rename_registers, 1,
1086 N_("Do the register renaming optimization pass") },
1087 {"cprop-registers", &flag_cprop_registers, 1,
1088 N_("Do the register copy-propagation optimization pass") },
1089 {"common", &flag_no_common, 0,
1090 N_("Do not put uninitialized globals in the common section") },
1091 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1092 N_("Do not generate .size directives") },
1093 {"function-sections", &flag_function_sections, 1,
1094 N_("place each function into its own section") },
1095 {"data-sections", &flag_data_sections, 1,
1096 N_("place data items into their own section") },
1097 {"verbose-asm", &flag_verbose_asm, 1,
1098 N_("Add extra commentry to assembler output") },
1099 {"gnu-linker", &flag_gnu_linker, 1,
1100 N_("Output GNU ld formatted global initializers") },
1101 {"regmove", &flag_regmove, 1,
1102 N_("Enables a register move optimization") },
1103 {"optimize-register-move", &flag_regmove, 1,
1104 N_("Do the full regmove optimization pass") },
1105 {"pack-struct", &flag_pack_struct, 1,
1106 N_("Pack structure members together without holes") },
1107 {"stack-check", &flag_stack_check, 1,
1108 N_("Insert stack checking code into the program") },
1109 {"argument-alias", &flag_argument_noalias, 0,
1110 N_("Specify that arguments may alias each other & globals") },
1111 {"argument-noalias", &flag_argument_noalias, 1,
1112 N_("Assume arguments may alias globals but not each other") },
1113 {"argument-noalias-global", &flag_argument_noalias, 2,
1114 N_("Assume arguments do not alias each other or globals") },
1115 {"strict-aliasing", &flag_strict_aliasing, 1,
1116 N_("Assume strict aliasing rules apply") },
1117 {"align-loops", &align_loops, 0,
1118 N_("Align the start of loops") },
1119 {"align-jumps", &align_jumps, 0,
1120 N_("Align labels which are only reached by jumping") },
1121 {"align-labels", &align_labels, 0,
1122 N_("Align all labels") },
1123 {"align-functions", &align_functions, 0,
1124 N_("Align the start of functions") },
1125 {"merge-constants", &flag_merge_constants, 1,
1126 N_("Attempt to merge identical constants accross compilation units") },
1127 {"merge-all-constants", &flag_merge_constants, 2,
1128 N_("Attempt to merge identical constants and constant variables") },
1129 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1130 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1131 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1132 N_("Instrument function entry/exit with profiling calls") },
1133 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1134 N_("Put zero initialized data in the bss section") },
1135 {"ssa", &flag_ssa, 1,
1136 N_("Enable SSA optimizations") },
1137 {"ssa-ccp", &flag_ssa_ccp, 1,
1138 N_("Enable SSA conditional constant propagation") },
1139 {"ssa-dce", &flag_ssa_dce, 1,
1140 N_("Enable aggressive SSA dead code elimination") },
1141 {"leading-underscore", &flag_leading_underscore, 1,
1142 N_("External symbols have a leading underscore") },
1143 {"ident", &flag_no_ident, 0,
1144 N_("Process #ident directives") },
1145 { "peephole2", &flag_peephole2, 1,
1146 N_("Enables an rtl peephole pass run before sched2") },
1147 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1148 N_("Enables guessing of branch probabilities") },
1149 {"math-errno", &flag_errno_math, 1,
1150 N_("Set errno after built-in math functions") },
1151 {"trapping-math", &flag_trapping_math, 1,
1152 N_("Floating-point operations can trap") },
1153 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1154 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1155 {"bounded-pointers", &flag_bounded_pointers, 1,
1156 N_("Compile pointers as triples: value, base & end") },
1157 {"bounds-check", &flag_bounds_check, 1,
1158 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1159 {"single-precision-constant", &flag_single_precision_constant, 1,
1160 N_("Convert floating point constant to single precision constant") },
1161 {"time-report", &time_report, 1,
1162 N_("Report time taken by each compiler pass at end of run") },
1163 {"mem-report", &mem_report, 1,
1164 N_("Report on permanent memory allocation at end of run") },
1165 { "trapv", &flag_trapv, 1,
1166 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1169 /* Table of language-specific options. */
1171 static const struct lang_opt
1173 const char *const option;
1174 const char *const description;
1176 documented_lang_options[] =
1178 /* In order not to overload the --help output, the convention
1179 used here is to only describe those options which are not
1180 enabled by default. */
1183 N_("Compile just for ISO C89") },
1185 N_("Determine language standard") },
1187 { "-fsigned-bitfields", "" },
1188 { "-funsigned-bitfields",
1189 N_("Make bit-fields by unsigned by default") },
1190 { "-fno-signed-bitfields", "" },
1191 { "-fno-unsigned-bitfields","" },
1193 N_("Make 'char' be signed by default") },
1194 { "-funsigned-char",
1195 N_("Make 'char' be unsigned by default") },
1196 { "-fno-signed-char", "" },
1197 { "-fno-unsigned-char", "" },
1201 N_("Do not recognize the 'asm' keyword") },
1202 { "-fbuiltin", "" },
1204 N_("Do not recognize any built in functions") },
1206 N_("Assume normal C execution environment") },
1207 { "-fno-hosted", "" },
1209 N_("Assume that standard libraries & main might not exist") },
1210 { "-fno-freestanding", "" },
1211 { "-fcond-mismatch",
1212 N_("Allow different types as args of ? operator") },
1213 { "-fno-cond-mismatch", "" },
1214 { "-fdollars-in-identifiers",
1215 N_("Allow the use of $ inside identifiers") },
1216 { "-fno-dollars-in-identifiers", "" },
1217 { "-fpreprocessed", "" },
1218 { "-fno-preprocessed", "" },
1220 N_("Use the same size for double as for float") },
1221 { "-fno-short-double", "" },
1223 N_("Use the smallest fitting integer to hold enums") },
1224 { "-fno-short-enums", "" },
1226 N_("Override the underlying type for wchar_t to `unsigned short'") },
1227 { "-fno-short-wchar", "" },
1230 N_("Enable most warning messages") },
1231 { "-Wbad-function-cast",
1232 N_("Warn about casting functions to incompatible types") },
1233 { "-Wno-bad-function-cast", "" },
1234 { "-Wmissing-format-attribute",
1235 N_("Warn about functions which might be candidates for format attributes") },
1236 { "-Wno-missing-format-attribute", "" },
1238 N_("Warn about casts which discard qualifiers") },
1239 { "-Wno-cast-qual", "" },
1240 { "-Wchar-subscripts",
1241 N_("Warn about subscripts whose type is 'char'") },
1242 { "-Wno-char-subscripts", "" },
1244 N_("Warn if nested comments are detected") },
1245 { "-Wno-comment", "" },
1247 N_("Warn if nested comments are detected") },
1248 { "-Wno-comments", "" },
1250 N_("Warn about possibly confusing type conversions") },
1251 { "-Wno-conversion", "" },
1252 { "-Wdiv-by-zero", "" },
1253 { "-Wno-div-by-zero",
1254 N_("Do not warn about compile-time integer division by zero") },
1256 N_("Warn about testing equality of floating point numbers") },
1257 { "-Wno-float-equal", "" },
1259 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1260 { "-Wno-format", "" },
1261 { "-Wformat-extra-args", "" },
1262 { "-Wno-format-extra-args",
1263 N_("Don't warn about too many arguments to format functions") },
1264 { "-Wformat-nonliteral",
1265 N_("Warn about non-string-literal format strings") },
1266 { "-Wno-format-nonliteral", "" },
1267 { "-Wformat-security",
1268 N_("Warn about possible security problems with format functions") },
1269 { "-Wno-format-security", "" },
1270 { "-Wformat-y2k", "" },
1271 { "-Wno-format-y2k",
1272 N_("Don't warn about strftime formats yielding 2 digit years") },
1273 { "-Wimplicit-function-declaration",
1274 N_("Warn about implicit function declarations") },
1275 { "-Wno-implicit-function-declaration", "" },
1276 { "-Werror-implicit-function-declaration", "" },
1278 N_("Warn when a declaration does not specify a type") },
1279 { "-Wno-implicit-int", "" },
1280 { "-Wimplicit", "" },
1281 { "-Wno-implicit", "" },
1283 N_("Warn about the use of the #import directive") },
1284 { "-Wno-import", "" },
1285 { "-Wlong-long","" },
1287 N_("Do not warn about using 'long long' when -pedantic") },
1289 N_("Warn about suspicious declarations of main") },
1290 { "-Wno-main", "" },
1291 { "-Wmissing-braces",
1292 N_("Warn about possibly missing braces around initializers") },
1293 { "-Wno-missing-braces", "" },
1294 { "-Wmissing-declarations",
1295 N_("Warn about global funcs without previous declarations") },
1296 { "-Wno-missing-declarations", "" },
1297 { "-Wmissing-prototypes",
1298 N_("Warn about global funcs without prototypes") },
1299 { "-Wno-missing-prototypes", "" },
1301 N_("Warn about use of multicharacter literals") },
1302 { "-Wno-multichar", "" },
1303 { "-Wnested-externs",
1304 N_("Warn about externs not at file scope level") },
1305 { "-Wno-nested-externs", "" },
1307 N_("Warn about possible missing parentheses") },
1308 { "-Wno-parentheses", "" },
1309 { "-Wpointer-arith",
1310 N_("Warn about function pointer arithmetic") },
1311 { "-Wno-pointer-arith", "" },
1312 { "-Wredundant-decls",
1313 N_("Warn about multiple declarations of the same object") },
1314 { "-Wno-redundant-decls", "" },
1316 N_("Warn whenever a function's return-type defaults to int") },
1317 { "-Wno-return-type", "" },
1318 { "-Wsequence-point",
1319 N_("Warn about possible violations of sequence point rules") },
1320 { "-Wno-sequence-point", "" },
1322 N_("Warn about signed/unsigned comparisons") },
1323 { "-Wno-sign-compare", "" },
1324 { "-Wstrict-prototypes",
1325 N_("Warn about non-prototyped function decls") },
1326 { "-Wno-strict-prototypes", "" },
1328 N_("Warn about constructs whose meanings change in ISO C") },
1329 { "-Wno-traditional", "" },
1331 N_("Warn when trigraphs are encountered") },
1332 { "-Wno-trigraphs", "" },
1334 { "-Wno-undef", "" },
1335 { "-Wunknown-pragmas",
1336 N_("Warn about unrecognized pragmas") },
1337 { "-Wno-unknown-pragmas", "" },
1338 { "-Wwrite-strings",
1339 N_("Mark strings as 'const char *'") },
1340 { "-Wno-write-strings", "" },
1342 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1344 #include "options.h"
1348 /* Here is a table, controlled by the tm.h file, listing each -m switch
1349 and which bits in `target_switches' it should set or clear.
1350 If VALUE is positive, it is bits to set.
1351 If VALUE is negative, -VALUE is bits to clear.
1352 (The sign bit is not used so there is no confusion.) */
1356 const char *const name;
1358 const char *const description;
1360 target_switches[] = TARGET_SWITCHES;
1362 /* This table is similar, but allows the switch to have a value. */
1364 #ifdef TARGET_OPTIONS
1367 const char *const prefix;
1368 const char **const variable;
1369 const char *const description;
1371 target_options[] = TARGET_OPTIONS;
1374 /* Options controlling warnings. */
1376 /* Don't print warning messages. -w. */
1378 int inhibit_warnings = 0;
1380 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1382 int warn_system_headers = 0;
1384 /* Print various extra warnings. -W. */
1386 int extra_warnings = 0;
1388 /* Treat warnings as errors. -Werror. */
1390 int warnings_are_errors = 0;
1392 /* Nonzero to warn about unused variables, functions et.al. */
1394 int warn_unused_function;
1395 int warn_unused_label;
1396 int warn_unused_parameter;
1397 int warn_unused_variable;
1398 int warn_unused_value;
1400 /* Nonzero to warn about code which is never reached. */
1402 int warn_notreached;
1404 /* Nonzero to warn about variables used before they are initialized. */
1406 int warn_uninitialized;
1408 /* Nonzero means warn about all declarations which shadow others. */
1412 /* Warn if a switch on an enum, that does not have a default case,
1413 fails to have a case for every enum value. */
1417 /* Warn if a switch does not have a default case. */
1419 int warn_switch_default;
1421 /* Warn if a switch on an enum fails to have a case for every enum
1422 value (regardless of the presence or otherwise of a default case). */
1424 int warn_switch_enum;
1426 /* Nonzero means warn about function definitions that default the return type
1427 or that use a null return and have a return-type other than void. */
1429 int warn_return_type;
1431 /* Nonzero means warn about pointer casts that increase the required
1432 alignment of the target type (and might therefore lead to a crash
1433 due to a misaligned access). */
1435 int warn_cast_align;
1437 /* Nonzero means warn about any objects definitions whose size is larger
1438 than N bytes. Also want about function definitions whose returned
1439 values are larger than N bytes. The value N is in `larger_than_size'. */
1441 int warn_larger_than;
1442 HOST_WIDE_INT larger_than_size;
1444 /* Nonzero means warn if inline function is too large. */
1448 /* Warn if a function returns an aggregate,
1449 since there are often incompatible calling conventions for doing this. */
1451 int warn_aggregate_return;
1453 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1457 /* Warn when gcc pads a structure to an alignment boundary. */
1461 /* Warn when an optimization pass is disabled. */
1463 int warn_disabled_optimization;
1465 /* Warn about functions which might be candidates for attribute noreturn. */
1467 int warn_missing_noreturn;
1469 /* Nonzero means warn about uses of __attribute__((deprecated))
1472 int warn_deprecated_decl = 1;
1474 /* Likewise for -W. */
1476 static const lang_independent_options W_options[] =
1478 {"unused-function", &warn_unused_function, 1,
1479 N_("Warn when a function is unused") },
1480 {"unused-label", &warn_unused_label, 1,
1481 N_("Warn when a label is unused") },
1482 {"unused-parameter", &warn_unused_parameter, 1,
1483 N_("Warn when a function parameter is unused") },
1484 {"unused-variable", &warn_unused_variable, 1,
1485 N_("Warn when a variable is unused") },
1486 {"unused-value", &warn_unused_value, 1,
1487 N_("Warn when an expression value is unused") },
1488 {"system-headers", &warn_system_headers, 1,
1489 N_("Do not suppress warnings from system headers") },
1490 {"error", &warnings_are_errors, 1,
1491 N_("Treat all warnings as errors") },
1492 {"shadow", &warn_shadow, 1,
1493 N_("Warn when one local variable shadows another") },
1494 {"switch", &warn_switch, 1,
1495 N_("Warn about enumerated switches, with no default, missing a case") },
1496 {"switch-default", &warn_switch_default, 1,
1497 N_("Warn about enumerated switches missing a default case") },
1498 {"switch-enum", &warn_switch_enum, 1,
1499 N_("Warn about all enumerated switches missing a specific case") },
1500 {"aggregate-return", &warn_aggregate_return, 1,
1501 N_("Warn about returning structures, unions or arrays") },
1502 {"cast-align", &warn_cast_align, 1,
1503 N_("Warn about pointer casts which increase alignment") },
1504 {"unreachable-code", &warn_notreached, 1,
1505 N_("Warn about code that will never be executed") },
1506 {"uninitialized", &warn_uninitialized, 1,
1507 N_("Warn about uninitialized automatic variables") },
1508 {"inline", &warn_inline, 1,
1509 N_("Warn when an inlined function cannot be inlined") },
1510 {"packed", &warn_packed, 1,
1511 N_("Warn when the packed attribute has no effect on struct layout") },
1512 {"padded", &warn_padded, 1,
1513 N_("Warn when padding is required to align struct members") },
1514 {"disabled-optimization", &warn_disabled_optimization, 1,
1515 N_("Warn when an optimization pass is disabled") },
1516 {"deprecated-declarations", &warn_deprecated_decl, 1,
1517 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1518 {"missing-noreturn", &warn_missing_noreturn, 1,
1519 N_("Warn about functions which might be candidates for attribute noreturn") }
1523 set_Wunused (setting)
1526 warn_unused_function = setting;
1527 warn_unused_label = setting;
1528 /* Unused function parameter warnings are reported when either ``-W
1529 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1530 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1532 warn_unused_parameter = 0;
1533 else if (!warn_unused_parameter)
1534 warn_unused_parameter = -1;
1535 warn_unused_variable = setting;
1536 warn_unused_value = setting;
1539 /* The following routines are useful in setting all the flags that
1540 -ffast-math and -fno-fast-math imply. */
1543 set_fast_math_flags ()
1545 flag_trapping_math = 0;
1546 flag_unsafe_math_optimizations = 1;
1547 flag_errno_math = 0;
1551 set_no_fast_math_flags ()
1553 flag_trapping_math = 1;
1554 flag_unsafe_math_optimizations = 0;
1555 flag_errno_math = 1;
1559 /* Output files for assembler code (real compiler output)
1560 and debugging dumps. */
1563 FILE *aux_info_file;
1564 FILE *rtl_dump_file = NULL;
1566 /* Decode the string P as an integral parameter.
1567 If the string is indeed an integer return its numeric value else
1568 issue an Invalid Option error for the option PNAME and return DEFVAL.
1569 If PNAME is zero just return DEFVAL, do not call error. */
1572 read_integral_parameter (p, pname, defval)
1577 const char *endp = p;
1581 if (ISDIGIT (*endp))
1590 error ("invalid option `%s'", pname);
1597 /* This calls abort and is used to avoid problems when abort if a macro.
1598 It is used when we need to pass the address of abort. */
1606 /* When `malloc.c' is compiled with `rcheck' defined,
1607 it calls this function to report clobberage. */
1611 const char *s ATTRIBUTE_UNUSED;
1616 /* Return the logarithm of X, base 2, considering X unsigned,
1617 if X is a power of 2. Otherwise, returns -1.
1619 This should be used via the `exact_log2' macro. */
1623 unsigned HOST_WIDE_INT x;
1626 /* Test for 0 or a power of 2. */
1627 if (x == 0 || x != (x & -x))
1629 while ((x >>= 1) != 0)
1634 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1635 If X is 0, return -1.
1637 This should be used via the floor_log2 macro. */
1641 unsigned HOST_WIDE_INT x;
1650 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1651 into ICE messages, which is much more user friendly. */
1654 crash_signal (signo)
1657 internal_error ("internal error: %s", strsignal (signo));
1660 /* Strip off a legitimate source ending from the input string NAME of
1661 length LEN. Rather than having to know the names used by all of
1662 our front ends, we strip off an ending of a period followed by
1663 up to five characters. (Java uses ".class".) */
1666 strip_off_ending (name, len)
1671 for (i = 2; i < 6 && len > i; i++)
1673 if (name[len - i] == '.')
1675 name[len - i] = '\0';
1681 /* Output a quoted string. */
1684 output_quoted_string (asm_file, string)
1688 #ifdef OUTPUT_QUOTED_STRING
1689 OUTPUT_QUOTED_STRING (asm_file, string);
1693 putc ('\"', asm_file);
1694 while ((c = *string++) != 0)
1698 if (c == '\"' || c == '\\')
1699 putc ('\\', asm_file);
1703 fprintf (asm_file, "\\%03o", c);
1705 putc ('\"', asm_file);
1709 /* Output a file name in the form wanted by System V. */
1712 output_file_directive (asm_file, input_name)
1714 const char *input_name;
1716 int len = strlen (input_name);
1717 const char *na = input_name + len;
1719 /* NA gets INPUT_NAME sans directory names. */
1720 while (na > input_name)
1722 if (IS_DIR_SEPARATOR (na[-1]))
1727 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1728 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1730 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1731 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1733 fprintf (asm_file, "\t.file\t");
1734 output_quoted_string (asm_file, na);
1735 fputc ('\n', asm_file);
1740 /* Routine to open a dump file. Return true if the dump file is enabled. */
1743 open_dump_file (index, decl)
1744 enum dump_file_index index;
1748 const char *open_arg;
1751 if (! dump_file[index].enabled)
1754 timevar_push (TV_DUMP);
1755 if (rtl_dump_file != NULL)
1756 fclose (rtl_dump_file);
1758 sprintf (seq, DUMPFILE_FORMAT, index);
1760 if (! dump_file[index].initialized)
1762 /* If we've not initialized the files, do so now. */
1763 if (graph_dump_format != no_graph
1764 && dump_file[index].graph_dump_p)
1766 dump_name = concat (seq, dump_file[index].extension, NULL);
1767 clean_graph_dump_file (dump_base_name, dump_name);
1770 dump_file[index].initialized = 1;
1776 dump_name = concat (dump_base_name, seq,
1777 dump_file[index].extension, NULL);
1779 rtl_dump_file = fopen (dump_name, open_arg);
1780 if (rtl_dump_file == NULL)
1781 fatal_io_error ("can't open %s", dump_name);
1786 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1787 (*lang_hooks.decl_printable_name) (decl, 2));
1789 timevar_pop (TV_DUMP);
1793 /* Routine to close a dump file. */
1796 close_dump_file (index, func, insns)
1797 enum dump_file_index index;
1798 void (*func) PARAMS ((FILE *, rtx));
1801 if (! rtl_dump_file)
1804 timevar_push (TV_DUMP);
1806 && graph_dump_format != no_graph
1807 && dump_file[index].graph_dump_p)
1812 sprintf (seq, DUMPFILE_FORMAT, index);
1813 suffix = concat (seq, dump_file[index].extension, NULL);
1814 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1819 func (rtl_dump_file, insns);
1821 fflush (rtl_dump_file);
1822 fclose (rtl_dump_file);
1824 rtl_dump_file = NULL;
1825 timevar_pop (TV_DUMP);
1828 /* Do any final processing required for the declarations in VEC, of
1829 which there are LEN. We write out inline functions and variables
1830 that have been deferred until this point, but which are required.
1831 Returns non-zero if anything was put out. */
1834 wrapup_global_declarations (vec, len)
1841 int output_something = 0;
1843 for (i = 0; i < len; i++)
1847 /* We're not deferring this any longer. */
1848 DECL_DEFER_OUTPUT (decl) = 0;
1850 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1851 (*lang_hooks.finish_incomplete_decl) (decl);
1854 /* Now emit any global variables or functions that we have been
1855 putting off. We need to loop in case one of the things emitted
1856 here references another one which comes earlier in the list. */
1860 for (i = 0; i < len; i++)
1864 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1867 /* Don't write out static consts, unless we still need them.
1869 We also keep static consts if not optimizing (for debugging),
1870 unless the user specified -fno-keep-static-consts.
1871 ??? They might be better written into the debug information.
1872 This is possible when using DWARF.
1874 A language processor that wants static constants to be always
1875 written out (even if it is not used) is responsible for
1876 calling rest_of_decl_compilation itself. E.g. the C front-end
1877 calls rest_of_decl_compilation from finish_decl.
1878 One motivation for this is that is conventional in some
1879 environments to write things like:
1880 static const char rcsid[] = "... version string ...";
1881 intending to force the string to be in the executable.
1883 A language processor that would prefer to have unneeded
1884 static constants "optimized away" would just defer writing
1885 them out until here. E.g. C++ does this, because static
1886 constants are often defined in header files.
1888 ??? A tempting alternative (for both C and C++) would be
1889 to force a constant to be written if and only if it is
1890 defined in a main file, as opposed to an include file. */
1892 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1896 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1898 else if (DECL_COMDAT (decl))
1900 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1901 && (optimize || !flag_keep_static_consts
1902 || DECL_ARTIFICIAL (decl)))
1908 rest_of_decl_compilation (decl, NULL, 1, 1);
1912 if (TREE_CODE (decl) == FUNCTION_DECL
1913 && DECL_INITIAL (decl) != 0
1914 && DECL_SAVED_INSNS (decl) != 0
1915 && (flag_keep_inline_functions
1916 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1917 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1920 output_inline_function (decl);
1925 output_something = 1;
1929 return output_something;
1932 /* Issue appropriate warnings for the global declarations in VEC (of
1933 which there are LEN). Output debugging information for them. */
1936 check_global_declarations (vec, len)
1943 for (i = 0; i < len; i++)
1947 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1948 && ! TREE_ASM_WRITTEN (decl))
1949 /* Cancel the RTL for this decl so that, if debugging info
1950 output for global variables is still to come,
1951 this one will be omitted. */
1952 SET_DECL_RTL (decl, NULL_RTX);
1954 /* Warn about any function
1955 declared static but not defined.
1956 We don't warn about variables,
1957 because many programs have static variables
1958 that exist only to get some text into the object file. */
1959 if (TREE_CODE (decl) == FUNCTION_DECL
1960 && (warn_unused_function
1961 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1962 && DECL_INITIAL (decl) == 0
1963 && DECL_EXTERNAL (decl)
1964 && ! DECL_ARTIFICIAL (decl)
1965 && ! TREE_PUBLIC (decl))
1967 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1968 pedwarn_with_decl (decl,
1969 "`%s' used but never defined");
1971 warning_with_decl (decl,
1972 "`%s' declared `static' but never defined");
1973 /* This symbol is effectively an "extern" declaration now. */
1974 TREE_PUBLIC (decl) = 1;
1975 assemble_external (decl);
1978 /* Warn about static fns or vars defined but not used. */
1979 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1980 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1981 && ! TREE_USED (decl)
1982 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1983 to handle multiple external decls in different scopes. */
1984 && ! TREE_USED (DECL_NAME (decl))
1985 && ! DECL_EXTERNAL (decl)
1986 && ! TREE_PUBLIC (decl)
1987 /* Global register variables must be declared to reserve them. */
1988 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1989 /* Otherwise, ask the language. */
1990 && (*lang_hooks.decls.warn_unused_global) (decl))
1991 warning_with_decl (decl, "`%s' defined but not used");
1993 timevar_push (TV_SYMOUT);
1994 (*debug_hooks->global_decl) (decl);
1995 timevar_pop (TV_SYMOUT);
1999 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2000 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2001 INPUT_FILENAME and LINENO accordingly. */
2004 push_srcloc (file, line)
2008 struct file_stack *fs;
2010 if (input_file_stack)
2012 input_file_stack->name = input_filename;
2013 input_file_stack->line = lineno;
2016 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2017 fs->name = input_filename = file;
2018 fs->line = lineno = line;
2019 fs->indent_level = 0;
2020 fs->next = input_file_stack;
2021 input_file_stack = fs;
2022 input_file_stack_tick++;
2025 /* Pop the top entry off the stack of presently open source files.
2026 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2032 struct file_stack *fs;
2034 fs = input_file_stack;
2035 input_file_stack = fs->next;
2037 input_file_stack_tick++;
2038 /* The initial source file is never popped. */
2039 if (!input_file_stack)
2041 input_filename = input_file_stack->name;
2042 lineno = input_file_stack->line;
2045 /* Compile an entire translation unit. Write a file of assembly
2046 output and various debugging dumps. */
2053 /* Initialize yet another pass. */
2055 init_final (main_input_filename);
2056 init_branch_prob (dump_base_name);
2058 timevar_push (TV_PARSE);
2060 /* Call the parser, which parses the entire file (calling
2061 rest_of_compilation for each function). */
2062 (*lang_hooks.parse_file) (set_yydebug);
2064 /* In case there were missing block closers,
2065 get us back to the global binding level. */
2066 (*lang_hooks.clear_binding_stack) ();
2068 /* Compilation is now finished except for writing
2069 what's left of the symbol table output. */
2070 timevar_pop (TV_PARSE);
2072 if (flag_syntax_only)
2075 globals = (*lang_hooks.decls.getdecls) ();
2077 /* Really define vars that have had only a tentative definition.
2078 Really output inline functions that must actually be callable
2079 and have not been output so far. */
2082 int len = list_length (globals);
2083 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2087 /* Process the decls in reverse order--earliest first.
2088 Put them into VEC from back to front, then take out from front. */
2090 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2091 vec[len - i - 1] = decl;
2093 wrapup_global_declarations (vec, len);
2095 /* This must occur after the loop to output deferred functions. Else
2096 the profiler initializer would not be emitted if all the functions
2097 in this compilation unit were deferred.
2099 output_func_start_profiler can not cause any additional functions or
2100 data to need to be output, so it need not be in the deferred function
2102 output_func_start_profiler ();
2104 check_global_declarations (vec, len);
2110 /* Write out any pending weak symbol declarations. */
2114 /* Do dbx symbols. */
2115 timevar_push (TV_SYMOUT);
2117 #ifdef DWARF2_UNWIND_INFO
2118 if (dwarf2out_do_frame ())
2119 dwarf2out_frame_finish ();
2122 (*debug_hooks->finish) (main_input_filename);
2123 timevar_pop (TV_SYMOUT);
2125 /* Output some stuff at end of file if nec. */
2127 dw2_output_indirect_constants ();
2129 end_final (dump_base_name);
2131 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2133 timevar_push (TV_DUMP);
2134 open_dump_file (DFI_bp, NULL);
2138 close_dump_file (DFI_bp, NULL, NULL_RTX);
2139 timevar_pop (TV_DUMP);
2143 ASM_FILE_END (asm_out_file);
2146 /* Attach a special .ident directive to the end of the file to identify
2147 the version of GCC which compiled this code. The format of the .ident
2148 string is patterned after the ones produced by native SVR4 compilers. */
2151 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2152 IDENT_ASM_OP, version_string);
2155 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2157 timevar_push (TV_DUMP);
2158 dump_combine_total_stats (rtl_dump_file);
2159 close_dump_file (DFI_combine, NULL, NULL_RTX);
2160 timevar_pop (TV_DUMP);
2164 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2165 and TYPE_DECL nodes.
2167 This does nothing for local (non-static) variables, unless the
2168 variable is a register variable with an ASMSPEC. In that case, or
2169 if the variable is not an automatic, it sets up the RTL and
2170 outputs any assembler code (label definition, storage allocation
2171 and initialization).
2173 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2174 the assembler symbol name to be used. TOP_LEVEL is nonzero
2175 if this declaration is not within a function. */
2178 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2180 const char *asmspec;
2184 /* Declarations of variables, and of functions defined elsewhere. */
2186 /* The most obvious approach, to put an #ifndef around where
2187 this macro is used, doesn't work since it's inside a macro call. */
2188 #ifndef ASM_FINISH_DECLARE_OBJECT
2189 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2192 /* We deferred calling assemble_alias so that we could collect
2193 other attributes such as visibility. Emit the alias now. */
2196 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2199 alias = TREE_VALUE (TREE_VALUE (alias));
2200 alias = get_identifier (TREE_STRING_POINTER (alias));
2201 assemble_alias (decl, alias);
2205 /* Forward declarations for nested functions are not "external",
2206 but we need to treat them as if they were. */
2207 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2208 || TREE_CODE (decl) == FUNCTION_DECL)
2210 timevar_push (TV_VARCONST);
2213 make_decl_rtl (decl, asmspec);
2215 /* Don't output anything when a tentative file-scope definition
2216 is seen. But at end of compilation, do output code for them. */
2217 if (at_end || !DECL_DEFER_OUTPUT (decl))
2218 assemble_variable (decl, top_level, at_end, 0);
2219 if (decl == last_assemble_variable_decl)
2221 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2225 timevar_pop (TV_VARCONST);
2227 else if (DECL_REGISTER (decl) && asmspec != 0)
2229 if (decode_reg_name (asmspec) >= 0)
2231 SET_DECL_RTL (decl, NULL_RTX);
2232 make_decl_rtl (decl, asmspec);
2236 error ("invalid register name `%s' for register variable", asmspec);
2237 DECL_REGISTER (decl) = 0;
2242 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2243 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2244 && TREE_CODE (decl) == TYPE_DECL)
2246 timevar_push (TV_SYMOUT);
2247 dbxout_symbol (decl, 0);
2248 timevar_pop (TV_SYMOUT);
2251 #ifdef SDB_DEBUGGING_INFO
2252 else if (write_symbols == SDB_DEBUG && top_level
2253 && TREE_CODE (decl) == TYPE_DECL)
2255 timevar_push (TV_SYMOUT);
2256 sdbout_symbol (decl, 0);
2257 timevar_pop (TV_SYMOUT);
2262 /* Called after finishing a record, union or enumeral type. */
2265 rest_of_type_compilation (type, toplev)
2266 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2270 tree type ATTRIBUTE_UNUSED;
2271 int toplev ATTRIBUTE_UNUSED;
2274 timevar_push (TV_SYMOUT);
2275 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2276 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2277 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2279 #ifdef SDB_DEBUGGING_INFO
2280 if (write_symbols == SDB_DEBUG)
2281 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2283 #ifdef DWARF2_DEBUGGING_INFO
2284 if ((write_symbols == DWARF2_DEBUG
2285 || write_symbols == VMS_AND_DWARF2_DEBUG)
2287 dwarf2out_decl (TYPE_STUB_DECL (type));
2289 timevar_pop (TV_SYMOUT);
2292 /* This is called from finish_function (within langhooks.parse_file)
2293 after each top-level definition is parsed.
2294 It is supposed to compile that function or variable
2295 and output the assembler code for it.
2296 After we return, the tree storage is freed. */
2299 rest_of_compilation (decl)
2305 int rebuild_label_notes_after_reload;
2306 int register_life_up_to_date;
2308 timevar_push (TV_REST_OF_COMPILATION);
2310 /* Now that we're out of the frontend, we shouldn't have any more
2311 CONCATs anywhere. */
2312 generating_concat_p = 0;
2314 /* When processing delayed functions, prepare_function_start() won't
2315 have been run to re-initialize it. */
2316 cse_not_expected = ! optimize;
2318 /* First, make sure that NOTE_BLOCK is set correctly for each
2319 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2320 if (!cfun->x_whole_function_mode_p)
2323 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2324 tree in sensible shape. So, we just recalculate it here. */
2325 if (cfun->x_whole_function_mode_p)
2330 /* If we are reconsidering an inline function
2331 at the end of compilation, skip the stuff for making it inline. */
2333 if (DECL_SAVED_INSNS (decl) == 0)
2339 /* If this is nested inside an inlined external function, pretend
2340 it was only declared. Since we cannot inline such functions,
2341 generating code for this one is not only not necessary but will
2342 confuse some debugging output writers. */
2343 for (parent = DECL_CONTEXT (current_function_decl);
2344 parent != NULL_TREE;
2345 parent = get_containing_scope (parent))
2346 if (TREE_CODE (parent) == FUNCTION_DECL
2347 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2349 DECL_INITIAL (decl) = 0;
2350 goto exit_rest_of_compilation;
2353 /* If requested, consider whether to make this function inline. */
2354 if ((DECL_INLINE (decl) && !flag_no_inline)
2355 || flag_inline_functions)
2357 timevar_push (TV_INTEGRATION);
2358 lose = function_cannot_inline_p (decl);
2359 timevar_pop (TV_INTEGRATION);
2360 if (lose || ! optimize)
2362 if (warn_inline && DECL_INLINE (decl))
2363 warning_with_decl (decl, lose);
2364 DECL_ABSTRACT_ORIGIN (decl) = 0;
2365 /* Don't really compile an extern inline function.
2366 If we can't make it inline, pretend
2367 it was only declared. */
2368 if (DECL_EXTERNAL (decl))
2370 DECL_INITIAL (decl) = 0;
2371 goto exit_rest_of_compilation;
2375 /* ??? Note that this has the effect of making it look
2376 like "inline" was specified for a function if we choose
2377 to inline it. This isn't quite right, but it's
2378 probably not worth the trouble to fix. */
2379 inlinable = DECL_INLINE (decl) = 1;
2382 insns = get_insns ();
2384 /* Dump the rtl code if we are dumping rtl. */
2386 if (open_dump_file (DFI_rtl, decl))
2388 if (DECL_SAVED_INSNS (decl))
2389 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2390 close_dump_file (DFI_rtl, print_rtl, insns);
2393 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2394 sorts of eh initialization. Delay this until after the
2395 initial rtl dump so that we can see the original nesting. */
2396 convert_from_eh_region_ranges ();
2398 /* If function is inline, and we don't yet know whether to
2399 compile it by itself, defer decision till end of compilation.
2400 finish_compilation will call rest_of_compilation again
2401 for those functions that need to be output. Also defer those
2402 functions that we are supposed to defer. */
2405 || (DECL_INLINE (decl)
2406 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2407 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2408 && ! flag_keep_inline_functions)
2409 || DECL_EXTERNAL (decl))))
2410 DECL_DEFER_OUTPUT (decl) = 1;
2412 if (DECL_INLINE (decl))
2413 /* DWARF wants separate debugging info for abstract and
2414 concrete instances of all inline functions, including those
2415 declared inline but not inlined, and those inlined even
2416 though they weren't declared inline. Conveniently, that's
2417 what DECL_INLINE means at this point. */
2418 (*debug_hooks->deferred_inline_function) (decl);
2420 if (DECL_DEFER_OUTPUT (decl))
2422 /* If -Wreturn-type, we have to do a bit of compilation. We just
2423 want to call cleanup the cfg to figure out whether or not we can
2424 fall off the end of the function; we do the minimum amount of
2425 work necessary to make that safe. */
2426 if (warn_return_type)
2428 int saved_optimize = optimize;
2431 rebuild_jump_labels (insns);
2432 find_exception_handler_labels ();
2433 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2434 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2435 optimize = saved_optimize;
2437 /* CFG is no longer maintained up-to-date. */
2438 free_bb_for_insn ();
2441 current_function_nothrow = nothrow_function_p ();
2442 if (current_function_nothrow)
2443 /* Now we know that this can't throw; set the flag for the benefit
2444 of other functions later in this translation unit. */
2445 TREE_NOTHROW (current_function_decl) = 1;
2447 timevar_push (TV_INTEGRATION);
2448 save_for_inline (decl);
2449 timevar_pop (TV_INTEGRATION);
2450 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2451 goto exit_rest_of_compilation;
2454 /* If specified extern inline but we aren't inlining it, we are
2455 done. This goes for anything that gets here with DECL_EXTERNAL
2456 set, not just things with DECL_INLINE. */
2457 if (DECL_EXTERNAL (decl))
2458 goto exit_rest_of_compilation;
2461 /* If we're emitting a nested function, make sure its parent gets
2462 emitted as well. Doing otherwise confuses debug info. */
2465 for (parent = DECL_CONTEXT (current_function_decl);
2466 parent != NULL_TREE;
2467 parent = get_containing_scope (parent))
2468 if (TREE_CODE (parent) == FUNCTION_DECL)
2469 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2472 /* We are now committed to emitting code for this function. Do any
2473 preparation, such as emitting abstract debug info for the inline
2474 before it gets mangled by optimization. */
2475 if (DECL_INLINE (decl))
2476 (*debug_hooks->outlining_inline_function) (decl);
2478 /* Remove any notes we don't need. That will make iterating
2479 over the instruction sequence faster, and allow the garbage
2480 collector to reclaim the memory used by the notes. */
2481 remove_unnecessary_notes ();
2486 /* Initialize some variables used by the optimizers. */
2487 init_function_for_compilation ();
2489 if (! DECL_DEFER_OUTPUT (decl))
2490 TREE_ASM_WRITTEN (decl) = 1;
2492 /* Now that integrate will no longer see our rtl, we need not
2493 distinguish between the return value of this function and the
2494 return value of called functions. Also, we can remove all SETs
2495 of subregs of hard registers; they are only here because of
2496 integrate. Also, we can now initialize pseudos intended to
2497 carry magic hard reg data throughout the function. */
2498 rtx_equal_function_value_matters = 0;
2499 purge_hard_subreg_sets (get_insns ());
2501 /* Early return if there were errors. We can run afoul of our
2502 consistency checks, and there's not really much point in fixing them.
2503 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2504 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2505 || errorcount || sorrycount)
2506 goto exit_rest_of_compilation;
2508 timevar_push (TV_JUMP);
2509 open_dump_file (DFI_sibling, decl);
2510 insns = get_insns ();
2511 rebuild_jump_labels (insns);
2512 find_exception_handler_labels ();
2513 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2515 delete_unreachable_blocks ();
2517 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2518 note_prediction_to_br_prob ();
2520 /* We may have potential sibling or tail recursion sites. Select one
2521 (of possibly multiple) methods of performing the call. */
2522 if (flag_optimize_sibling_calls)
2525 optimize_sibling_and_tail_recursive_calls ();
2527 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2528 notes before simplifying cfg and we must do lowering after sibcall
2529 that unhides parts of RTL chain and cleans up the CFG.
2531 Until sibcall is replaced by tree-level optimizer, lets just
2532 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2533 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2534 if (GET_CODE (insn) == NOTE
2535 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2538 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2539 timevar_pop (TV_JUMP);
2541 /* Complete generation of exception handling code. */
2542 find_exception_handler_labels ();
2545 timevar_push (TV_JUMP);
2546 open_dump_file (DFI_eh, decl);
2548 finish_eh_generation ();
2550 close_dump_file (DFI_eh, print_rtl, get_insns ());
2551 timevar_pop (TV_JUMP);
2554 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2555 generation, which might create new sets. */
2556 emit_initial_value_sets ();
2559 /* If we are doing position-independent code generation, now
2560 is the time to output special prologues and epilogues.
2561 We do not want to do this earlier, because it just clutters
2562 up inline functions with meaningless insns. */
2567 insns = get_insns ();
2569 /* Copy any shared structure that should not be shared. */
2570 unshare_all_rtl (current_function_decl, insns);
2572 #ifdef SETJMP_VIA_SAVE_AREA
2573 /* This must be performed before virtual register instantiation. */
2574 if (current_function_calls_alloca)
2575 optimize_save_area_alloca (insns);
2578 /* Instantiate all virtual registers. */
2579 instantiate_virtual_regs (current_function_decl, insns);
2581 open_dump_file (DFI_jump, decl);
2583 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2584 are initialized and to compute whether control can drop off the end
2587 timevar_push (TV_JUMP);
2588 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2589 before jump optimization switches branch directions. */
2590 expected_value_to_br_prob ();
2592 reg_scan (insns, max_reg_num (), 0);
2593 rebuild_jump_labels (insns);
2594 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2596 dump_flow_info (rtl_dump_file);
2597 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2598 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2600 /* CFG is no longer maintained up-to-date. */
2601 free_bb_for_insn ();
2602 copy_loop_headers (insns);
2603 purge_line_number_notes (insns);
2605 timevar_pop (TV_JUMP);
2606 close_dump_file (DFI_jump, print_rtl, insns);
2608 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2609 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2611 goto exit_rest_of_compilation;
2614 /* Long term, this should probably move before the jump optimizer too,
2615 but I didn't want to disturb the rtl_dump_and_exit and related
2616 stuff at this time. */
2617 if (optimize > 0 && flag_ssa)
2619 /* Convert to SSA form. */
2621 timevar_push (TV_TO_SSA);
2622 open_dump_file (DFI_ssa, decl);
2624 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2625 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2628 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2629 timevar_pop (TV_TO_SSA);
2631 /* Perform sparse conditional constant propagation, if requested. */
2634 timevar_push (TV_SSA_CCP);
2635 open_dump_file (DFI_ssa_ccp, decl);
2639 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2640 timevar_pop (TV_SSA_CCP);
2643 /* It would be useful to cleanup the CFG at this point, but block
2644 merging and possibly other transformations might leave a PHI
2645 node in the middle of a basic block, which is a strict no-no. */
2647 /* The SSA implementation uses basic block numbers in its phi
2648 nodes. Thus, changing the control-flow graph or the basic
2649 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2650 may cause problems. */
2654 /* Remove dead code. */
2656 timevar_push (TV_SSA_DCE);
2657 open_dump_file (DFI_ssa_dce, decl);
2659 insns = get_insns ();
2660 ssa_eliminate_dead_code ();
2662 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2663 timevar_pop (TV_SSA_DCE);
2666 /* Convert from SSA form. */
2668 timevar_push (TV_FROM_SSA);
2669 open_dump_file (DFI_ussa, decl);
2671 convert_from_ssa ();
2672 /* New registers have been created. Rescan their usage. */
2673 reg_scan (insns, max_reg_num (), 1);
2675 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2676 timevar_pop (TV_FROM_SSA);
2679 /* CFG is no longer maintained up-to-date. */
2680 free_bb_for_insn ();
2683 timevar_push (TV_JUMP);
2685 if (flag_delete_null_pointer_checks || flag_if_conversion)
2687 open_dump_file (DFI_null, decl);
2688 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2690 dump_flow_info (rtl_dump_file);
2691 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2693 /* Try to identify useless null pointer tests and delete them. */
2694 if (flag_delete_null_pointer_checks)
2695 delete_null_pointer_checks (insns);
2697 timevar_push (TV_IFCVT);
2698 if (flag_if_conversion)
2700 timevar_pop (TV_IFCVT);
2701 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2702 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2705 /* Jump optimization, and the removal of NULL pointer checks, may
2706 have reduced the number of instructions substantially. CSE, and
2707 future passes, allocate arrays whose dimensions involve the
2708 maximum instruction UID, so if we can reduce the maximum UID
2709 we'll save big on memory. */
2710 renumber_insns (rtl_dump_file);
2712 compute_bb_for_insn (get_max_uid ());
2713 timevar_pop (TV_JUMP);
2715 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2719 /* Perform common subexpression elimination.
2720 Nonzero value from `cse_main' means that jumps were simplified
2721 and some code may now be unreachable, so do
2722 jump optimization again. */
2726 open_dump_file (DFI_cse, decl);
2728 dump_flow_info (rtl_dump_file);
2729 timevar_push (TV_CSE);
2731 reg_scan (insns, max_reg_num (), 1);
2733 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2735 rebuild_jump_labels (insns);
2736 purge_all_dead_edges (0);
2738 delete_trivially_dead_insns (insns, max_reg_num ());
2740 /* If we are not running more CSE passes, then we are no longer
2741 expecting CSE to be run. But always rerun it in a cheap mode. */
2742 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2744 if (tem || optimize > 1)
2745 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2746 /* Try to identify useless null pointer tests and delete them. */
2747 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2749 timevar_push (TV_JUMP);
2751 if (flag_delete_null_pointer_checks)
2752 delete_null_pointer_checks (insns);
2753 /* CFG is no longer maintained up-to-date. */
2754 timevar_pop (TV_JUMP);
2757 /* The second pass of jump optimization is likely to have
2758 removed a bunch more instructions. */
2759 renumber_insns (rtl_dump_file);
2760 compute_bb_for_insn (get_max_uid ());
2762 timevar_pop (TV_CSE);
2763 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2766 open_dump_file (DFI_addressof, decl);
2768 purge_addressof (insns);
2770 purge_all_dead_edges (0);
2771 reg_scan (insns, max_reg_num (), 1);
2773 close_dump_file (DFI_addressof, print_rtl, insns);
2777 /* Perform global cse. */
2779 if (optimize > 0 && flag_gcse)
2781 int save_csb, save_cfj;
2784 timevar_push (TV_GCSE);
2785 open_dump_file (DFI_gcse, decl);
2787 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2788 tem = gcse_main (insns, rtl_dump_file);
2789 rebuild_jump_labels (insns);
2790 delete_trivially_dead_insns (insns, max_reg_num ());
2792 save_csb = flag_cse_skip_blocks;
2793 save_cfj = flag_cse_follow_jumps;
2794 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2796 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2798 if (flag_expensive_optimizations)
2800 timevar_push (TV_CSE);
2801 reg_scan (insns, max_reg_num (), 1);
2802 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2803 purge_all_dead_edges (0);
2804 delete_trivially_dead_insns (insns, max_reg_num ());
2805 timevar_pop (TV_CSE);
2806 cse_not_expected = !flag_rerun_cse_after_loop;
2809 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2810 things up. Then possibly re-run CSE again. */
2814 timevar_push (TV_JUMP);
2815 rebuild_jump_labels (insns);
2816 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2817 timevar_pop (TV_JUMP);
2819 if (flag_expensive_optimizations)
2821 timevar_push (TV_CSE);
2822 reg_scan (insns, max_reg_num (), 1);
2823 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2824 purge_all_dead_edges (0);
2825 delete_trivially_dead_insns (insns, max_reg_num ());
2826 timevar_pop (TV_CSE);
2830 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2831 timevar_pop (TV_GCSE);
2834 flag_cse_skip_blocks = save_csb;
2835 flag_cse_follow_jumps = save_cfj;
2836 #ifdef ENABLE_CHECKING
2837 verify_flow_info ();
2841 /* Move constant computations out of loops. */
2843 if (optimize > 0 && flag_loop_optimize)
2845 timevar_push (TV_LOOP);
2846 delete_dead_jumptables ();
2847 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2848 open_dump_file (DFI_loop, decl);
2849 /* CFG is no longer maintained up-to-date. */
2850 free_bb_for_insn ();
2852 if (flag_rerun_loop_opt)
2854 cleanup_barriers ();
2856 /* We only want to perform unrolling once. */
2857 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2859 /* The first call to loop_optimize makes some instructions
2860 trivially dead. We delete those instructions now in the
2861 hope that doing so will make the heuristics in loop work
2862 better and possibly speed up compilation. */
2863 delete_trivially_dead_insns (insns, max_reg_num ());
2865 /* The regscan pass is currently necessary as the alias
2866 analysis code depends on this information. */
2867 reg_scan (insns, max_reg_num (), 1);
2869 cleanup_barriers ();
2870 loop_optimize (insns, rtl_dump_file,
2871 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2872 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2874 /* Loop can create trivially dead instructions. */
2875 delete_trivially_dead_insns (insns, max_reg_num ());
2876 close_dump_file (DFI_loop, print_rtl, insns);
2877 timevar_pop (TV_LOOP);
2882 /* Do control and data flow analysis; wrote some of the results to
2885 timevar_push (TV_FLOW);
2886 open_dump_file (DFI_cfg, decl);
2888 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2890 dump_flow_info (rtl_dump_file);
2891 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2892 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2894 /* It may make more sense to mark constant functions after dead code is
2895 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2896 may insert code making function non-constant, but we still must consider
2897 it as constant, otherwise -fbranch-probabilities will not read data back.
2899 life_analyzis rarely eliminates modification of external memory.
2902 mark_constant_function ();
2904 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2906 /* Do branch profiling and static profile estimation passes. */
2907 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
2911 timevar_push (TV_BRANCH_PROB);
2912 open_dump_file (DFI_bp, decl);
2913 if (cfun->arc_profile || flag_branch_probabilities)
2916 /* Discover and record the loop depth at the head of each basic
2917 block. The loop infrastructure does the real job for us. */
2918 flow_loops_find (&loops, LOOP_TREE);
2920 /* Estimate using heuristics if no profiling info is available. */
2921 if (flag_guess_branch_prob)
2922 estimate_probability (&loops);
2925 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2927 flow_loops_free (&loops);
2928 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2929 timevar_pop (TV_BRANCH_PROB);
2934 timevar_push (TV_CSE2);
2935 open_dump_file (DFI_cse2, decl);
2937 dump_flow_info (rtl_dump_file);
2939 if (flag_rerun_cse_after_loop)
2941 timevar_push (TV_JUMP);
2943 reg_scan (insns, max_reg_num (), 0);
2945 timevar_push (TV_IFCVT);
2946 cleanup_cfg (CLEANUP_EXPENSIVE);
2947 if (flag_if_conversion)
2949 timevar_pop (TV_IFCVT);
2951 timevar_pop (TV_JUMP);
2952 /* CFG is no longer maintained up-to-date. */
2953 reg_scan (insns, max_reg_num (), 0);
2954 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2955 purge_all_dead_edges (0);
2956 delete_trivially_dead_insns (insns, max_reg_num ());
2960 timevar_push (TV_JUMP);
2961 rebuild_jump_labels (insns);
2962 cleanup_cfg (CLEANUP_EXPENSIVE);
2963 timevar_pop (TV_JUMP);
2967 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2968 timevar_pop (TV_CSE2);
2973 cse_not_expected = 1;
2975 open_dump_file (DFI_life, decl);
2978 check_function_return_warnings ();
2980 #ifdef ENABLE_CHECKING
2981 verify_flow_info ();
2983 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2985 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2986 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2987 timevar_pop (TV_FLOW);
2991 if (warn_uninitialized || extra_warnings)
2993 uninitialized_vars_warning (DECL_INITIAL (decl));
2995 setjmp_args_warning ();
3001 if (initialize_uninitialized_subregs ())
3003 /* Insns were inserted, so things might look a bit different. */
3004 insns = get_insns ();
3005 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3006 PROP_LOG_LINKS | PROP_REG_INFO
3007 | PROP_DEATH_NOTES);
3011 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3015 /* If -opt, try combining insns through substitution. */
3019 int rebuild_jump_labels_after_combine = 0;
3021 timevar_push (TV_COMBINE);
3022 open_dump_file (DFI_combine, decl);
3024 rebuild_jump_labels_after_combine
3025 = combine_instructions (insns, max_reg_num ());
3027 /* Combining insns may have turned an indirect jump into a
3028 direct jump. Rebuid the JUMP_LABEL fields of jumping
3030 if (rebuild_jump_labels_after_combine)
3032 timevar_push (TV_JUMP);
3033 rebuild_jump_labels (insns);
3034 timevar_pop (TV_JUMP);
3036 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3039 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3040 timevar_pop (TV_COMBINE);
3045 /* Rerun if-conversion, as combine may have simplified things enough to
3046 now meet sequence length restrictions. */
3047 if (flag_if_conversion)
3049 timevar_push (TV_IFCVT);
3050 open_dump_file (DFI_ce, decl);
3056 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3057 timevar_pop (TV_IFCVT);
3060 /* Register allocation pre-pass, to reduce number of moves
3061 necessary for two-address machines. */
3062 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3064 timevar_push (TV_REGMOVE);
3065 open_dump_file (DFI_regmove, decl);
3067 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3069 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3070 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3071 timevar_pop (TV_REGMOVE);
3076 /* Do unconditional splitting before register allocation to allow machine
3077 description to add extra information not needed previously. */
3078 split_all_insns (1);
3080 /* Any of the several passes since flow1 will have munged register
3081 lifetime data a bit. */
3082 register_life_up_to_date = 0;
3084 #ifdef OPTIMIZE_MODE_SWITCHING
3085 timevar_push (TV_MODE_SWITCH);
3088 optimize_mode_switching (NULL);
3091 timevar_pop (TV_MODE_SWITCH);
3094 timevar_push (TV_SCHED);
3096 #ifdef INSN_SCHEDULING
3098 /* Print function header into sched dump now
3099 because doing the sched analysis makes some of the dump. */
3100 if (optimize > 0 && flag_schedule_insns)
3102 open_dump_file (DFI_sched, decl);
3104 /* Do control and data sched analysis,
3105 and write some of the results to dump file. */
3107 schedule_insns (rtl_dump_file);
3109 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3111 /* Register lifetime information was updated as part of verifying
3113 register_life_up_to_date = 1;
3116 timevar_pop (TV_SCHED);
3120 /* Determine if the current function is a leaf before running reload
3121 since this can impact optimizations done by the prologue and
3122 epilogue thus changing register elimination offsets. */
3123 current_function_is_leaf = leaf_function_p ();
3125 timevar_push (TV_LOCAL_ALLOC);
3126 open_dump_file (DFI_lreg, decl);
3128 /* Allocate pseudo-regs that are used only within 1 basic block.
3130 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3131 jump optimizer after register allocation and reloading are finished. */
3133 if (! register_life_up_to_date)
3134 recompute_reg_usage (insns, ! optimize_size);
3136 /* Allocate the reg_renumber array. */
3137 allocate_reg_info (max_regno, FALSE, TRUE);
3139 /* And the reg_equiv_memory_loc array. */
3140 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3142 allocate_initial_values (reg_equiv_memory_loc);
3144 regclass (insns, max_reg_num (), rtl_dump_file);
3145 rebuild_label_notes_after_reload = local_alloc ();
3147 timevar_pop (TV_LOCAL_ALLOC);
3149 if (dump_file[DFI_lreg].enabled)
3151 timevar_push (TV_DUMP);
3153 dump_flow_info (rtl_dump_file);
3154 dump_local_alloc (rtl_dump_file);
3156 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3157 timevar_pop (TV_DUMP);
3162 timevar_push (TV_GLOBAL_ALLOC);
3163 open_dump_file (DFI_greg, decl);
3165 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3166 pass fixing up any insns that are invalid. */
3169 failure = global_alloc (rtl_dump_file);
3172 build_insn_chain (insns);
3173 failure = reload (insns, 0);
3176 timevar_pop (TV_GLOBAL_ALLOC);
3178 if (dump_file[DFI_greg].enabled)
3180 timevar_push (TV_DUMP);
3182 dump_global_regs (rtl_dump_file);
3184 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3185 timevar_pop (TV_DUMP);
3189 goto exit_rest_of_compilation;
3193 open_dump_file (DFI_postreload, decl);
3195 /* Do a very simple CSE pass over just the hard registers. */
3198 timevar_push (TV_RELOAD_CSE_REGS);
3199 reload_cse_regs (insns);
3200 timevar_pop (TV_RELOAD_CSE_REGS);
3203 /* Register allocation and reloading may have turned an indirect jump into
3204 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3205 jumping instructions. */
3206 if (rebuild_label_notes_after_reload)
3208 timevar_push (TV_JUMP);
3210 rebuild_jump_labels (insns);
3211 purge_all_dead_edges (0);
3213 timevar_pop (TV_JUMP);
3216 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3218 /* Re-create the death notes which were deleted during reload. */
3219 timevar_push (TV_FLOW2);
3220 open_dump_file (DFI_flow2, decl);
3222 #ifdef ENABLE_CHECKING
3223 verify_flow_info ();
3226 /* If optimizing, then go ahead and split insns now. */
3228 split_all_insns (0);
3230 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3232 /* On some machines, the prologue and epilogue code, or parts thereof,
3233 can be represented as RTL. Doing so lets us schedule insns between
3234 it and the rest of the code and also allows delayed branch
3235 scheduling to operate in the epilogue. */
3236 thread_prologue_and_epilogue_insns (insns);
3240 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3241 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3242 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3244 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3245 even for machines with possibly nonzero RETURN_POPS_ARGS
3246 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3247 push instructions will have popping returns. */
3248 #ifndef PUSH_ROUNDING
3249 if (!ACCUMULATE_OUTGOING_ARGS)
3251 combine_stack_adjustments ();
3256 flow2_completed = 1;
3258 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3259 timevar_pop (TV_FLOW2);
3261 #ifdef HAVE_peephole2
3262 if (optimize > 0 && flag_peephole2)
3264 timevar_push (TV_PEEPHOLE2);
3265 open_dump_file (DFI_peephole2, decl);
3267 peephole2_optimize (rtl_dump_file);
3269 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3270 timevar_pop (TV_PEEPHOLE2);
3274 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3276 timevar_push (TV_RENAME_REGISTERS);
3277 open_dump_file (DFI_rnreg, decl);
3279 if (flag_rename_registers)
3280 regrename_optimize ();
3281 if (flag_cprop_registers)
3282 copyprop_hardreg_forward ();
3284 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3285 timevar_pop (TV_RENAME_REGISTERS);
3288 if (flag_if_conversion2)
3290 timevar_push (TV_IFCVT2);
3291 open_dump_file (DFI_ce2, decl);
3295 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3296 timevar_pop (TV_IFCVT2);
3300 split_all_insns (1);
3303 #ifdef INSN_SCHEDULING
3304 if (optimize > 0 && flag_schedule_insns_after_reload)
3306 timevar_push (TV_SCHED2);
3307 open_dump_file (DFI_sched2, decl);
3309 /* Do control and data sched analysis again,
3310 and write some more of the results to dump file. */
3312 split_all_insns (1);
3314 schedule_insns (rtl_dump_file);
3316 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3317 timevar_pop (TV_SCHED2);
3323 #ifdef LEAF_REGISTERS
3324 current_function_uses_only_leaf_regs
3325 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3329 timevar_push (TV_REG_STACK);
3330 open_dump_file (DFI_stack, decl);
3332 reg_to_stack (insns, rtl_dump_file);
3334 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3335 timevar_pop (TV_REG_STACK);
3341 timevar_push (TV_REORDER_BLOCKS);
3342 open_dump_file (DFI_bbro, decl);
3344 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3345 splitting possibly introduced more crossjumping oppurtuntities.
3346 Except that we can't actually run crossjumping without running
3347 another DCE pass, which we can't do after reg-stack. */
3348 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3349 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3350 if (flag_reorder_blocks)
3352 reorder_basic_blocks ();
3353 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3356 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3357 timevar_pop (TV_REORDER_BLOCKS);
3359 compute_alignments ();
3361 /* CFG is no longer maintained up-to-date. */
3362 free_bb_for_insn ();
3364 /* If a machine dependent reorganization is needed, call it. */
3365 #ifdef MACHINE_DEPENDENT_REORG
3366 timevar_push (TV_MACH_DEP);
3367 open_dump_file (DFI_mach, decl);
3369 MACHINE_DEPENDENT_REORG (insns);
3371 close_dump_file (DFI_mach, print_rtl, insns);
3372 timevar_pop (TV_MACH_DEP);
3377 purge_line_number_notes (insns);
3378 cleanup_barriers ();
3380 /* If a scheduling pass for delayed branches is to be done,
3381 call the scheduling code. */
3384 if (optimize > 0 && flag_delayed_branch)
3386 timevar_push (TV_DBR_SCHED);
3387 open_dump_file (DFI_dbr, decl);
3389 dbr_schedule (insns, rtl_dump_file);
3391 close_dump_file (DFI_dbr, print_rtl, insns);
3392 timevar_pop (TV_DBR_SCHED);
3398 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3399 timevar_push (TV_SHORTEN_BRANCH);
3400 split_all_insns_noflow ();
3401 timevar_pop (TV_SHORTEN_BRANCH);
3404 convert_to_eh_region_ranges ();
3406 /* Shorten branches. */
3407 timevar_push (TV_SHORTEN_BRANCH);
3408 shorten_branches (get_insns ());
3409 timevar_pop (TV_SHORTEN_BRANCH);
3411 current_function_nothrow = nothrow_function_p ();
3412 if (current_function_nothrow)
3413 /* Now we know that this can't throw; set the flag for the benefit
3414 of other functions later in this translation unit. */
3415 TREE_NOTHROW (current_function_decl) = 1;
3417 /* Now turn the rtl into assembler code. */
3419 timevar_push (TV_FINAL);
3424 /* Get the function's name, as described by its RTL. This may be
3425 different from the DECL_NAME name used in the source file. */
3427 x = DECL_RTL (decl);
3428 if (GET_CODE (x) != MEM)
3431 if (GET_CODE (x) != SYMBOL_REF)
3433 fnname = XSTR (x, 0);
3435 assemble_start_function (decl, fnname);
3436 final_start_function (insns, asm_out_file, optimize);
3437 final (insns, asm_out_file, optimize, 0);
3438 final_end_function ();
3440 #ifdef IA64_UNWIND_INFO
3441 /* ??? The IA-64 ".handlerdata" directive must be issued before
3442 the ".endp" directive that closes the procedure descriptor. */
3443 output_function_exception_table ();
3446 assemble_end_function (decl, fnname);
3448 #ifndef IA64_UNWIND_INFO
3449 /* Otherwise, it feels unclean to switch sections in the middle. */
3450 output_function_exception_table ();
3454 fflush (asm_out_file);
3456 /* Release all memory allocated by flow. */
3457 free_basic_block_vars (0);
3459 /* Release all memory held by regsets now. */
3460 regset_release_memory ();
3462 timevar_pop (TV_FINAL);
3466 /* Write DBX symbols if requested. */
3468 /* Note that for those inline functions where we don't initially
3469 know for certain that we will be generating an out-of-line copy,
3470 the first invocation of this routine (rest_of_compilation) will
3471 skip over this code by doing a `goto exit_rest_of_compilation;'.
3472 Later on, finish_compilation will call rest_of_compilation again
3473 for those inline functions that need to have out-of-line copies
3474 generated. During that call, we *will* be routed past here. */
3476 timevar_push (TV_SYMOUT);
3477 (*debug_hooks->function_decl) (decl);
3478 timevar_pop (TV_SYMOUT);
3480 exit_rest_of_compilation:
3482 /* In case the function was not output,
3483 don't leave any temporary anonymous types
3484 queued up for sdb output. */
3485 #ifdef SDB_DEBUGGING_INFO
3486 if (write_symbols == SDB_DEBUG)
3487 sdbout_types (NULL_TREE);
3490 reload_completed = 0;
3491 flow2_completed = 0;
3494 timevar_push (TV_FINAL);
3496 /* Clear out the insn_length contents now that they are no
3498 init_insn_lengths ();
3500 /* Show no temporary slots allocated. */
3503 free_basic_block_vars (0);
3504 free_bb_for_insn ();
3506 timevar_pop (TV_FINAL);
3508 /* Make sure volatile mem refs aren't considered valid operands for
3509 arithmetic insns. We must call this here if this is a nested inline
3510 function, since the above code leaves us in the init_recog state
3511 (from final.c), and the function context push/pop code does not
3512 save/restore volatile_ok.
3514 ??? Maybe it isn't necessary for expand_start_function to call this
3515 anymore if we do it here? */
3517 init_recog_no_volatile ();
3519 /* We're done with this function. Free up memory if we can. */
3520 free_after_parsing (cfun);
3521 if (! DECL_DEFER_OUTPUT (decl))
3523 free_after_compilation (cfun);
3525 /* Clear integrate.c's pointer to the cfun structure we just
3527 DECL_SAVED_INSNS (decl) = 0;
3533 timevar_pop (TV_REST_OF_COMPILATION);
3543 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3544 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3545 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3546 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3547 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3548 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"));
3550 for (i = ARRAY_SIZE (f_options); i--;)
3552 const char *description = f_options[i].description;
3554 if (description != NULL && *description != 0)
3555 printf (" -f%-21s %s\n",
3556 f_options[i].string, _(description));
3559 printf (_(" -O[number] Set optimization level to [number]\n"));
3560 printf (_(" -Os Optimize for space rather than speed\n"));
3561 for (i = LAST_PARAM; i--;)
3563 const char *description = compiler_params[i].help;
3564 const int length = 21 - strlen (compiler_params[i].option);
3566 if (description != NULL && *description != 0)
3567 printf (" --param %s=<value>%.*s%s\n",
3568 compiler_params[i].option,
3569 length > 0 ? length : 1, " ",
3572 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3573 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3574 printf (_(" -w Suppress warnings\n"));
3575 printf (_(" -W Enable extra warnings\n"));
3577 for (i = ARRAY_SIZE (W_options); i--;)
3579 const char *description = W_options[i].description;
3581 if (description != NULL && *description != 0)
3582 printf (" -W%-21s %s\n",
3583 W_options[i].string, _(description));
3586 printf (_(" -Wunused Enable unused warnings\n"));
3587 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3588 printf (_(" -p Enable function profiling\n"));
3589 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3590 printf (_(" -a Enable block profiling \n"));
3592 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3593 printf (_(" -ax Enable jump profiling \n"));
3595 printf (_(" -o <file> Place output into <file> \n"));
3597 -G <number> Put global and static data smaller than <number>\n\
3598 bytes into a special section (on some targets)\n"));
3600 for (i = ARRAY_SIZE (debug_args); i--;)
3602 if (debug_args[i].description != NULL)
3603 printf (" -g%-21s %s\n",
3604 debug_args[i].arg, _(debug_args[i].description));
3607 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3608 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3609 printf (_(" -version Display the compiler's version\n"));
3610 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3611 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3612 #if defined INSN_SCHEDULING
3613 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3615 printf (_(" --help Display this information\n"));
3620 /* Display descriptions of language specific options.
3621 If there is no description, note that there is an undocumented option.
3622 If the description is empty, do not display anything. (This allows
3623 options to be deliberately undocumented, for whatever reason).
3624 If the option string is missing, then this is a marker, indicating
3625 that the description string is in fact the name of a language, whose
3626 language specific options are to follow. */
3628 if (ARRAY_SIZE (documented_lang_options) > 1)
3630 printf (_("\nLanguage specific options:\n"));
3632 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3634 const char *description = documented_lang_options[i].description;
3635 const char *option = documented_lang_options[i].option;
3637 if (description == NULL)
3642 printf (_(" %-23.23s [undocumented]\n"), option);
3644 else if (*description == 0)
3646 else if (option == NULL)
3650 (_("\nThere are undocumented %s specific options as well.\n"),
3654 printf (_("\n Options for %s:\n"), description);
3659 printf (" %-23.23s %s\n", option, _(description));
3664 printf (_("\nThere are undocumented %s specific options as well.\n"),
3667 display_target_options ();
3671 display_target_options ()
3674 static bool displayed = false;
3676 /* Avoid double printing for --help --target-help. */
3681 if (ARRAY_SIZE (target_switches) > 1
3682 #ifdef TARGET_OPTIONS
3683 || ARRAY_SIZE (target_options) > 1
3691 printf (_("\nTarget specific options:\n"));
3693 for (i = ARRAY_SIZE (target_switches); i--;)
3695 const char *option = target_switches[i].name;
3696 const char *description = target_switches[i].description;
3698 if (option == NULL || *option == 0)
3700 else if (description == NULL)
3705 printf (_(" -m%-23.23s [undocumented]\n"), option);
3707 else if (*description != 0)
3708 doc += printf (" -m%-23.23s %s\n", option, _(description));
3711 #ifdef TARGET_OPTIONS
3712 for (i = ARRAY_SIZE (target_options); i--;)
3714 const char *option = target_options[i].prefix;
3715 const char *description = target_options[i].description;
3717 if (option == NULL || *option == 0)
3719 else if (description == NULL)
3724 printf (_(" -m%-23.23s [undocumented]\n"), option);
3726 else if (*description != 0)
3727 doc += printf (" -m%-23.23s %s\n", option, _(description));
3733 printf (_("\nThere are undocumented target specific options as well.\n"));
3735 printf (_(" They exist, but they are not documented.\n"));
3740 /* Parse a -d... command line switch. */
3743 decode_d_option (arg)
3752 for (i = 0; i < (int) DFI_MAX; ++i)
3753 dump_file[i].enabled = 1;
3759 flag_print_asm_name = 1;
3762 flag_dump_rtl_in_asm = 1;
3763 flag_print_asm_name = 1;
3766 graph_dump_format = vcg;
3769 rtl_dump_and_exit = 1;
3774 case 'D': /* These are handled by the preprocessor. */
3780 for (i = 0; i < (int) DFI_MAX; ++i)
3781 if (c == dump_file[i].debug_switch)
3783 dump_file[i].enabled = 1;
3788 warning ("unrecognized gcc debugging option: %c", c);
3793 /* Parse a -f... command line switch. ARG is the value after the -f.
3794 It is safe to access 'ARG - 2' to generate the full switch name.
3795 Return the number of strings consumed. */
3798 decode_f_option (arg)
3802 const char *option_value = NULL;
3804 /* Search for the option in the table of binary f options. */
3805 for (j = ARRAY_SIZE (f_options); j--;)
3807 if (!strcmp (arg, f_options[j].string))
3809 *f_options[j].variable = f_options[j].on_value;
3813 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3814 && ! strcmp (arg + 3, f_options[j].string))
3816 *f_options[j].variable = ! f_options[j].on_value;
3821 if (!strcmp (arg, "fast-math"))
3822 set_fast_math_flags ();
3823 else if (!strcmp (arg, "no-fast-math"))
3824 set_no_fast_math_flags ();
3825 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3826 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3829 read_integral_parameter (option_value, arg - 2,
3831 set_param_value ("max-inline-insns", val);
3833 #ifdef INSN_SCHEDULING
3834 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3835 fix_sched_param ("verbose", option_value);
3837 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3838 fix_register (option_value, 1, 1);
3839 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3840 fix_register (option_value, 0, 1);
3841 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3842 fix_register (option_value, 0, 0);
3843 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3844 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3845 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3847 = read_integral_parameter (option_value, arg - 2, align_functions);
3848 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3849 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3850 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3852 = read_integral_parameter (option_value, arg - 2, align_labels);
3853 else if ((option_value
3854 = skip_leading_substring (arg, "stack-limit-register=")))
3856 int reg = decode_reg_name (option_value);
3858 error ("unrecognized register name `%s'", option_value);
3860 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3862 else if ((option_value
3863 = skip_leading_substring (arg, "stack-limit-symbol=")))
3866 nm = ggc_strdup (option_value);
3867 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3869 else if ((option_value
3870 = skip_leading_substring (arg, "message-length=")))
3871 output_set_maximum_length
3872 (&global_dc->buffer, read_integral_parameter
3873 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3874 else if ((option_value
3875 = skip_leading_substring (arg, "diagnostics-show-location=")))
3877 if (!strcmp (option_value, "once"))
3878 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3879 else if (!strcmp (option_value, "every-line"))
3880 diagnostic_prefixing_rule (global_dc)
3881 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3883 error ("unrecognized option `%s'", arg - 2);
3885 else if (!strcmp (arg, "no-stack-limit"))
3886 stack_limit_rtx = NULL_RTX;
3887 else if (!strcmp (arg, "preprocessed"))
3888 /* Recognise this switch but do nothing. This prevents warnings
3889 about an unrecognized switch if cpplib has not been linked in. */
3897 /* Parse a -W... command line switch. ARG is the value after the -W.
3898 It is safe to access 'ARG - 2' to generate the full switch name.
3899 Return the number of strings consumed. */
3902 decode_W_option (arg)
3905 const char *option_value = NULL;
3908 /* Search for the option in the table of binary W options. */
3910 for (j = ARRAY_SIZE (W_options); j--;)
3912 if (!strcmp (arg, W_options[j].string))
3914 *W_options[j].variable = W_options[j].on_value;
3918 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3919 && ! strcmp (arg + 3, W_options[j].string))
3921 *W_options[j].variable = ! W_options[j].on_value;
3926 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3927 warning ("-Wid-clash-LEN is no longer supported");
3928 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3930 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3932 warn_larger_than = larger_than_size != -1;
3934 else if (!strcmp (arg, "unused"))
3938 else if (!strcmp (arg, "no-unused"))
3948 /* Parse a -g... command line switch. ARG is the value after the -g.
3949 It is safe to access 'ARG - 2' to generate the full switch name.
3950 Return the number of strings consumed. */
3953 decode_g_option (arg)
3956 static unsigned level = 0;
3957 /* A lot of code assumes write_symbols == NO_DEBUG if the
3958 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3959 of what debugging type has been selected). This records the
3960 selected type. It is an error to specify more than one
3962 static enum debug_info_type selected_debug_type = NO_DEBUG;
3963 /* Non-zero if debugging format has been explicitly set.
3964 -g and -ggdb don't explicitly set the debugging format so
3965 -gdwarf -g3 is equivalent to -gdwarf3. */
3966 static int type_explicitly_set_p = 0;
3967 /* Indexed by enum debug_info_type. */
3968 static const char *const debug_type_names[] =
3970 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3973 /* The maximum admissible debug level value. */
3974 static const unsigned max_debug_level = 3;
3976 /* Look up ARG in the table. */
3977 for (da = debug_args; da->arg; da++)
3979 const int da_len = strlen (da->arg);
3981 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3983 enum debug_info_type type = da->debug_type;
3984 const char *p = arg + da_len;
3986 if (*p && ! ISDIGIT (*p))
3989 /* A debug flag without a level defaults to level 2.
3990 Note we do not want to call read_integral_parameter
3991 for that case since it will call atoi which
3994 ??? We may want to generalize the interface to
3995 read_integral_parameter to better handle this case
3996 if this case shows up often. */
3998 level = read_integral_parameter (p, 0, max_debug_level + 1);
4000 level = (level == 0) ? 2 : level;
4002 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4004 error ("use -gdwarf -g%d for DWARF v1, level %d",
4007 error ("use -gdwarf-2 for DWARF v2");
4010 if (level > max_debug_level)
4013 ignoring option `%s' due to invalid debug level specification",
4015 level = debug_info_level;
4018 if (type == NO_DEBUG)
4020 type = PREFERRED_DEBUGGING_TYPE;
4022 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4024 #ifdef DWARF2_DEBUGGING_INFO
4025 type = DWARF2_DEBUG;
4027 #ifdef DBX_DEBUGGING_INFO
4034 if (type == NO_DEBUG)
4035 warning ("`%s': unknown or unsupported -g option", arg - 2);
4037 /* Does it conflict with an already selected type? */
4038 if (type_explicitly_set_p
4039 /* -g/-ggdb don't conflict with anything. */
4040 && da->debug_type != NO_DEBUG
4041 && type != selected_debug_type)
4042 warning ("`%s' ignored, conflicts with `-g%s'",
4043 arg - 2, debug_type_names[(int) selected_debug_type]);
4046 /* If the format has already been set, -g/-ggdb
4047 only change the debug level. */
4048 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4049 /* Don't change debugging type. */
4053 selected_debug_type = type;
4054 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4057 write_symbols = (level == 0
4059 : selected_debug_type);
4060 use_gnu_debug_info_extensions = da->use_extensions_p;
4061 debug_info_level = (enum debug_info_level) level;
4074 /* Decode the first argument in the argv as a language-independent option.
4075 Return the number of strings consumed. */
4078 independent_decode_option (argc, argv)
4082 char *arg = argv[0];
4084 if (arg[0] != '-' || arg[1] == 0)
4096 if (!strcmp (arg, "-help"))
4099 exit_after_options = 1;
4102 if (!strcmp (arg, "-target-help"))
4104 display_target_options ();
4105 exit_after_options = 1;
4108 if (!strcmp (arg, "-version"))
4110 print_version (stderr, "");
4111 exit_after_options = 1;
4114 /* Handle '--param <name>=<value>'. */
4115 if (strcmp (arg, "-param") == 0)
4121 error ("-param option missing argument");
4125 /* Get the '<name>=<value>' parameter. */
4127 /* Look for the `='. */
4128 equal = strchr (arg, '=');
4130 error ("invalid --param option: %s", arg);
4135 /* Zero out the `=' sign so that we get two separate strings. */
4137 /* Figure out what value is specified. */
4138 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4139 if (val != INVALID_PARAM_VAL)
4140 set_param_value (arg, val);
4142 error ("invalid parameter value `%s'", equal + 1);
4157 /* Already been treated in main (). Do nothing. */
4161 set_target_switch (arg + 1);
4165 return decode_f_option (arg + 1);
4168 return decode_g_option (arg + 1);
4171 if (!strcmp (arg, "dumpbase"))
4176 dump_base_name = argv[1];
4180 decode_d_option (arg + 1);
4184 if (!strcmp (arg, "pedantic"))
4186 else if (!strcmp (arg, "pedantic-errors"))
4187 flag_pedantic_errors = pedantic = 1;
4188 else if (arg[1] == 0)
4195 if (!strcmp (arg, "quiet"))
4202 if (!strcmp (arg, "version"))
4210 inhibit_warnings = 1;
4219 /* We save the value of warn_uninitialized, since if they put
4220 -Wuninitialized on the command line, we need to generate a
4221 warning about not using it without also specifying -O. */
4222 if (warn_uninitialized != 1)
4223 warn_uninitialized = 2;
4226 return decode_W_option (arg + 1);
4230 if (!strncmp (arg, "aux-info", 8))
4237 aux_info_file_name = argv[1];
4238 flag_gen_aux_info = 1;
4241 else if (arg[8] == '=')
4243 aux_info_file_name = arg + 9;
4244 flag_gen_aux_info = 1;
4259 asm_file_name = argv[1];
4274 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4279 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4283 if (g_switch_val == -1)
4287 g_switch_set = TRUE;
4288 g_switch_value = g_switch_val;
4298 /* Decode -m switches. */
4299 /* Decode the switch -mNAME. */
4302 set_target_switch (name)
4306 int valid_target_option = 0;
4308 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4309 if (!strcmp (target_switches[j].name, name))
4311 if (target_switches[j].value < 0)
4312 target_flags &= ~-target_switches[j].value;
4314 target_flags |= target_switches[j].value;
4315 valid_target_option = 1;
4318 #ifdef TARGET_OPTIONS
4319 if (!valid_target_option)
4320 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4322 int len = strlen (target_options[j].prefix);
4323 if (!strncmp (target_options[j].prefix, name, len))
4325 *target_options[j].variable = name + len;
4326 valid_target_option = 1;
4331 if (!valid_target_option)
4332 error ("invalid option `%s'", name);
4335 /* Print version information to FILE.
4336 Each line begins with INDENT (for the case where FILE is the
4337 assembler output file). */
4340 print_version (file, indent)
4345 #define __VERSION__ "[?]"
4349 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4351 "%s%s%s version %s (%s) compiled by CC.\n"
4353 , indent, *indent != 0 ? " " : "",
4354 lang_hooks.name, version_string, TARGET_NAME,
4355 indent, __VERSION__);
4358 /* Print an option value and return the adjusted position in the line.
4359 ??? We don't handle error returns from fprintf (disk full); presumably
4360 other code will catch a disk full though. */
4363 print_single_switch (file, pos, max, indent, sep, term, type, name)
4366 const char *indent, *sep, *term, *type, *name;
4368 /* The ultrix fprintf returns 0 on success, so compute the result we want
4369 here since we need it for the following test. */
4370 int len = strlen (sep) + strlen (type) + strlen (name);
4375 fprintf (file, "%s", term);
4380 fprintf (file, "%s", indent);
4381 pos = strlen (indent);
4383 fprintf (file, "%s%s%s", sep, type, name);
4388 /* Print active target switches to FILE.
4389 POS is the current cursor position and MAX is the size of a "line".
4390 Each line begins with INDENT and ends with TERM.
4391 Each switch is separated from the next by SEP. */
4394 print_switch_values (file, pos, max, indent, sep, term)
4397 const char *indent, *sep, *term;
4402 /* Print the options as passed. */
4404 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4405 _("options passed: "), "");
4407 for (p = &save_argv[1]; *p != NULL; p++)
4411 if (strcmp (*p, "-o") == 0)
4417 if (strcmp (*p, "-quiet") == 0)
4419 if (strcmp (*p, "-version") == 0)
4424 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4427 fprintf (file, "%s", term);
4429 /* Print the -f and -m options that have been enabled.
4430 We don't handle language specific options but printing argv
4433 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4434 _("options enabled: "), "");
4436 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4437 if (*f_options[j].variable == f_options[j].on_value)
4438 pos = print_single_switch (file, pos, max, indent, sep, term,
4439 "-f", f_options[j].string);
4441 /* Print target specific options. */
4443 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4444 if (target_switches[j].name[0] != '\0'
4445 && target_switches[j].value > 0
4446 && ((target_switches[j].value & target_flags)
4447 == target_switches[j].value))
4449 pos = print_single_switch (file, pos, max, indent, sep, term,
4450 "-m", target_switches[j].name);
4453 #ifdef TARGET_OPTIONS
4454 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4455 if (*target_options[j].variable != NULL)
4458 sprintf (prefix, "-m%s", target_options[j].prefix);
4459 pos = print_single_switch (file, pos, max, indent, sep, term,
4460 prefix, *target_options[j].variable);
4464 fprintf (file, "%s", term);
4467 /* Open assembly code output file. Do this even if -fsyntax-only is
4468 on, because then the driver will have provided the name of a
4469 temporary file or bit bucket for us. NAME is the file specified on
4470 the command line, possibly NULL. */
4472 init_asm_output (name)
4475 if (name == NULL && asm_file_name == 0)
4476 asm_out_file = stdout;
4479 if (asm_file_name == 0)
4481 int len = strlen (dump_base_name);
4482 char *dumpname = (char *) xmalloc (len + 6);
4483 memcpy (dumpname, dump_base_name, len + 1);
4484 strip_off_ending (dumpname, len);
4485 strcat (dumpname, ".s");
4486 asm_file_name = dumpname;
4488 if (!strcmp (asm_file_name, "-"))
4489 asm_out_file = stdout;
4491 asm_out_file = fopen (asm_file_name, "w");
4492 if (asm_out_file == 0)
4493 fatal_io_error ("can't open %s for writing", asm_file_name);
4496 #ifdef IO_BUFFER_SIZE
4497 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4498 _IOFBF, IO_BUFFER_SIZE);
4501 if (!flag_syntax_only)
4503 #ifdef ASM_FILE_START
4504 ASM_FILE_START (asm_out_file);
4507 #ifdef ASM_COMMENT_START
4508 if (flag_verbose_asm)
4510 /* Print the list of options in effect. */
4511 print_version (asm_out_file, ASM_COMMENT_START);
4512 print_switch_values (asm_out_file, 0, MAX_LINE,
4513 ASM_COMMENT_START, " ", "\n");
4514 /* Add a blank line here so it appears in assembler output but not
4516 fprintf (asm_out_file, "\n");
4522 /* Initialization of the front end environment, before command line
4523 options are parsed. Signal handlers, internationalization etc.
4524 ARGV0 is main's argv[0]. */
4526 general_init (argv0)
4531 p = argv0 + strlen (argv0);
4532 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4536 xmalloc_set_program_name (progname);
4538 gcc_init_libintl ();
4540 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4542 signal (SIGSEGV, crash_signal);
4545 signal (SIGILL, crash_signal);
4548 signal (SIGBUS, crash_signal);
4551 signal (SIGABRT, crash_signal);
4553 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4554 signal (SIGIOT, crash_signal);
4557 signal (SIGFPE, crash_signal);
4560 /* Initialize the diagnostics reporting machinery, so option parsing
4561 can give warnings and errors. */
4562 diagnostic_initialize (global_dc);
4565 /* Parse command line options and set default flag values, called
4566 after language-independent option-independent initialization. Do
4567 minimal options processing. Outputting diagnostics is OK, but GC
4568 and identifier hashtables etc. are not initialized yet. */
4570 parse_options_and_default_flags (argc, argv)
4576 /* Save in case md file wants to emit args as a comment. */
4580 /* Initialize register usage now so switches may override. */
4583 /* Register the language-independent parameters. */
4584 add_params (lang_independent_params, LAST_PARAM);
4586 /* Perform language-specific options initialization. */
4587 (*lang_hooks.init_options) ();
4589 /* Scan to see what optimization level has been specified. That will
4590 determine the default value of many flags. */
4591 for (i = 1; i < argc; i++)
4593 if (!strcmp (argv[i], "-O"))
4598 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4600 /* Handle -Os, -O2, -O3, -O69, ... */
4601 char *p = &argv[i][2];
4603 if ((p[0] == 's') && (p[1] == 0))
4607 /* Optimizing for size forces optimize to be 2. */
4612 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4613 if (optimize_val != -1)
4615 optimize = optimize_val;
4624 flag_merge_constants = 0;
4630 flag_thread_jumps = 1;
4632 flag_delayed_branch = 1;
4634 #ifdef CAN_DEBUG_WITHOUT_FP
4635 flag_omit_frame_pointer = 1;
4637 flag_guess_branch_prob = 1;
4638 flag_cprop_registers = 1;
4639 flag_loop_optimize = 1;
4640 flag_crossjumping = 1;
4641 flag_if_conversion = 1;
4642 flag_if_conversion2 = 1;
4647 flag_optimize_sibling_calls = 1;
4648 flag_cse_follow_jumps = 1;
4649 flag_cse_skip_blocks = 1;
4651 flag_expensive_optimizations = 1;
4652 flag_strength_reduce = 1;
4653 flag_rerun_cse_after_loop = 1;
4654 flag_rerun_loop_opt = 1;
4655 flag_caller_saves = 1;
4658 #ifdef INSN_SCHEDULING
4659 flag_schedule_insns = 1;
4660 flag_schedule_insns_after_reload = 1;
4663 flag_strict_aliasing = 1;
4664 flag_delete_null_pointer_checks = 1;
4665 flag_reorder_blocks = 1;
4666 flag_reorder_functions = 1;
4671 flag_inline_functions = 1;
4672 flag_rename_registers = 1;
4675 if (optimize < 2 || optimize_size)
4680 align_functions = 1;
4683 /* Initialize whether `char' is signed. */
4684 flag_signed_char = DEFAULT_SIGNED_CHAR;
4685 #ifdef DEFAULT_SHORT_ENUMS
4686 /* Initialize how much space enums occupy, by default. */
4687 flag_short_enums = DEFAULT_SHORT_ENUMS;
4690 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4693 set_target_switch ("");
4695 /* Unwind tables are always present in an ABI-conformant IA-64
4696 object file, so the default should be ON. */
4697 #ifdef IA64_UNWIND_INFO
4698 flag_unwind_tables = IA64_UNWIND_INFO;
4701 #ifdef OPTIMIZATION_OPTIONS
4702 /* Allow default optimizations to be specified on a per-machine basis. */
4703 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4706 /* Perform normal command line switch decoding. */
4707 for (i = 1; i < argc;)
4710 int indep_processed;
4712 /* Give the language a chance to decode the option for itself. */
4713 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4715 if (lang_processed >= 0)
4716 /* Now see if the option also has a language independent meaning.
4717 Some options are both language specific and language independent,
4719 indep_processed = independent_decode_option (argc - i, argv + i);
4722 lang_processed = -lang_processed;
4723 indep_processed = 0;
4726 if (lang_processed || indep_processed)
4727 i += MAX (lang_processed, indep_processed);
4730 const char *option = NULL;
4731 const char *lang = NULL;
4734 /* It is possible that the command line switch is not valid for the
4735 current language, but it is valid for another language. In order
4736 to be compatible with previous versions of the compiler (which
4737 did not issue an error message in this case) we check for this
4738 possibility here. If we do find a match, then if extra_warnings
4739 is set we generate a warning message, otherwise we will just
4740 ignore the option. */
4741 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4743 option = documented_lang_options[j].option;
4746 lang = documented_lang_options[j].description;
4747 else if (! strncmp (argv[i], option, strlen (option)))
4751 if (j != ARRAY_SIZE (documented_lang_options))
4755 warning ("ignoring command line option '%s'", argv[i]);
4758 ("(it is valid for %s but not the selected language)",
4762 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4763 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4765 error ("unrecognized option `%s'", argv[i]);
4771 if (flag_no_inline == 2)
4774 flag_really_no_inline = flag_no_inline;
4776 /* Set flag_no_inline before the post_options () hook. The C front
4777 ends use it to determine tree inlining defaults. FIXME: such
4778 code should be lang-independent when all front ends use tree
4779 inlining, in which case it, and this condition, should be moved
4780 to the top of process_options() instead. */
4783 /* Inlining does not work if not optimizing,
4784 so force it not to be done. */
4788 /* The c_decode_option function and decode_option hook set
4789 this to `2' if -Wall is used, so we can avoid giving out
4790 lots of errors for people who don't realize what -Wall does. */
4791 if (warn_uninitialized == 1)
4792 warning ("-Wuninitialized is not supported without -O");
4795 if (flag_really_no_inline == 2)
4796 flag_really_no_inline = flag_no_inline;
4798 /* All command line options have been parsed; allow the front end to
4799 perform consistency checks, etc. */
4800 (*lang_hooks.post_options) ();
4803 /* Process the options that have been parsed. */
4807 #ifdef OVERRIDE_OPTIONS
4808 /* Some machines may reject certain combinations of options. */
4812 /* Set up the align_*_log variables, defaulting them to 1 if they
4813 were still unset. */
4814 if (align_loops <= 0) align_loops = 1;
4815 if (align_loops_max_skip > align_loops || !align_loops)
4816 align_loops_max_skip = align_loops - 1;
4817 align_loops_log = floor_log2 (align_loops * 2 - 1);
4818 if (align_jumps <= 0) align_jumps = 1;
4819 if (align_jumps_max_skip > align_jumps || !align_jumps)
4820 align_jumps_max_skip = align_jumps - 1;
4821 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4822 if (align_labels <= 0) align_labels = 1;
4823 align_labels_log = floor_log2 (align_labels * 2 - 1);
4824 if (align_labels_max_skip > align_labels || !align_labels)
4825 align_labels_max_skip = align_labels - 1;
4826 if (align_functions <= 0) align_functions = 1;
4827 align_functions_log = floor_log2 (align_functions * 2 - 1);
4829 /* Unrolling all loops implies that standard loop unrolling must also
4831 if (flag_unroll_all_loops)
4832 flag_unroll_loops = 1;
4833 /* Loop unrolling requires that strength_reduction be on also. Silently
4834 turn on strength reduction here if it isn't already on. Also, the loop
4835 unrolling code assumes that cse will be run after loop, so that must
4836 be turned on also. */
4837 if (flag_unroll_loops)
4839 flag_strength_reduce = 1;
4840 flag_rerun_cse_after_loop = 1;
4843 if (flag_non_call_exceptions)
4844 flag_asynchronous_unwind_tables = 1;
4845 if (flag_asynchronous_unwind_tables)
4846 flag_unwind_tables = 1;
4848 /* Warn about options that are not supported on this machine. */
4849 #ifndef INSN_SCHEDULING
4850 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4851 warning ("instruction scheduling not supported on this target machine");
4854 if (flag_delayed_branch)
4855 warning ("this target machine does not have delayed branches");
4858 /* Some operating systems do not allow profiling without a frame
4860 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4862 && flag_omit_frame_pointer)
4864 error ("profiling does not work without a frame pointer");
4865 flag_omit_frame_pointer = 0;
4868 user_label_prefix = USER_LABEL_PREFIX;
4869 if (flag_leading_underscore != -1)
4871 /* If the default prefix is more complicated than "" or "_",
4872 issue a warning and ignore this option. */
4873 if (user_label_prefix[0] == 0 ||
4874 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4876 user_label_prefix = flag_leading_underscore ? "_" : "";
4879 warning ("-f%sleading-underscore not supported on this target machine",
4880 flag_leading_underscore ? "" : "no-");
4883 /* If we are in verbose mode, write out the version and maybe all the
4884 option flags in use. */
4887 print_version (stderr, "");
4889 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4895 if (flag_syntax_only)
4897 write_symbols = NO_DEBUG;
4901 /* Now we know write_symbols, set up the debug hooks based on it.
4902 By default we do nothing for debug output. */
4903 #if defined(DBX_DEBUGGING_INFO)
4904 if (write_symbols == DBX_DEBUG)
4905 debug_hooks = &dbx_debug_hooks;
4907 #if defined(XCOFF_DEBUGGING_INFO)
4908 if (write_symbols == XCOFF_DEBUG)
4909 debug_hooks = &xcoff_debug_hooks;
4911 #ifdef SDB_DEBUGGING_INFO
4912 if (write_symbols == SDB_DEBUG)
4913 debug_hooks = &sdb_debug_hooks;
4915 #ifdef DWARF_DEBUGGING_INFO
4916 if (write_symbols == DWARF_DEBUG)
4917 debug_hooks = &dwarf_debug_hooks;
4919 #ifdef DWARF2_DEBUGGING_INFO
4920 if (write_symbols == DWARF2_DEBUG)
4921 debug_hooks = &dwarf2_debug_hooks;
4923 #ifdef VMS_DEBUGGING_INFO
4924 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4925 debug_hooks = &vmsdbg_debug_hooks;
4928 /* If auxiliary info generation is desired, open the output file.
4929 This goes in the same directory as the source file--unlike
4930 all the other output files. */
4931 if (flag_gen_aux_info)
4933 aux_info_file = fopen (aux_info_file_name, "w");
4934 if (aux_info_file == 0)
4935 fatal_io_error ("can't open %s", aux_info_file_name);
4938 if (! targetm.have_named_sections)
4940 if (flag_function_sections)
4942 warning ("-ffunction-sections not supported for this target");
4943 flag_function_sections = 0;
4945 if (flag_data_sections)
4947 warning ("-fdata-sections not supported for this target");
4948 flag_data_sections = 0;
4952 if (flag_function_sections && profile_flag)
4954 warning ("-ffunction-sections disabled; it makes profiling impossible");
4955 flag_function_sections = 0;
4958 #ifndef HAVE_prefetch
4959 if (flag_prefetch_loop_arrays)
4961 warning ("-fprefetch-loop-arrays not supported for this target");
4962 flag_prefetch_loop_arrays = 0;
4965 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4967 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4968 flag_prefetch_loop_arrays = 0;
4972 /* This combination of options isn't handled for i386 targets and doesn't
4973 make much sense anyway, so don't allow it. */
4974 if (flag_prefetch_loop_arrays && optimize_size)
4976 warning ("-fprefetch-loop-arrays is not supported with -Os");
4977 flag_prefetch_loop_arrays = 0;
4980 #ifndef OBJECT_FORMAT_ELF
4981 if (flag_function_sections && write_symbols != NO_DEBUG)
4982 warning ("-ffunction-sections may affect debugging on some targets");
4986 /* Language-independent initialization, before language-dependent
4989 lang_independent_init ()
4991 /* Initialize the garbage-collector, and string pools. */
4993 ggc_add_rtx_root (&stack_limit_rtx, 1);
4994 ggc_add_tree_root (¤t_function_decl, 1);
4995 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5000 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5001 || debug_info_level == DINFO_LEVEL_VERBOSE
5002 #ifdef VMS_DEBUGGING_INFO
5003 /* Enable line number info for traceback */
5004 || debug_info_level > DINFO_LEVEL_NONE
5006 || flag_test_coverage
5007 || warn_notreached);
5013 init_function_once ();
5014 init_stor_layout_once ();
5015 init_varasm_once ();
5016 init_EXPR_INSN_LIST_cache ();
5018 /* The following initialization functions need to generate rtl, so
5019 provide a dummy function context for them. */
5020 init_dummy_function_start ();
5023 if (flag_caller_saves)
5024 init_caller_save ();
5025 expand_dummy_function_end ();
5028 /* Language-dependent initialization. Returns non-zero on success. */
5030 lang_dependent_init (name)
5033 if (dump_base_name == 0)
5034 dump_base_name = name ? name : "gccdump";
5036 /* Front-end initialization. This hook can assume that GC,
5037 identifier hashes etc. are set up, but debug initialization is
5038 not done yet. This routine must return the original filename
5039 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5040 name = (*lang_hooks.init) (name);
5044 /* Is this duplication necessary? */
5045 name = ggc_strdup (name);
5046 main_input_filename = input_filename = name;
5047 init_asm_output (name);
5049 /* These create various _DECL nodes, so need to be called after the
5050 front end is initialized. */
5054 /* Put an entry on the input file stack for the main input file. */
5055 push_srcloc (input_filename, 0);
5057 /* If dbx symbol table desired, initialize writing it and output the
5058 predefined types. */
5059 timevar_push (TV_SYMOUT);
5061 #ifdef DWARF2_UNWIND_INFO
5062 if (dwarf2out_do_frame ())
5063 dwarf2out_frame_init ();
5066 /* Now we have the correct original filename, we can initialize
5068 (*debug_hooks->init) (name);
5070 timevar_pop (TV_SYMOUT);
5075 /* Clean up: close opened files, etc. */
5080 /* Close the dump files. */
5081 if (flag_gen_aux_info)
5083 fclose (aux_info_file);
5085 unlink (aux_info_file_name);
5088 /* Close non-debugging input and output files. Take special care to note
5089 whether fclose returns an error, since the pages might still be on the
5090 buffer chain while the file is open. */
5094 if (ferror (asm_out_file) != 0)
5095 fatal_io_error ("error writing to %s", asm_file_name);
5096 if (fclose (asm_out_file) != 0)
5097 fatal_io_error ("error closing %s", asm_file_name);
5100 /* Do whatever is necessary to finish printing the graphs. */
5101 if (graph_dump_format != no_graph)
5105 for (i = 0; i < (int) DFI_MAX; ++i)
5106 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5111 sprintf (seq, DUMPFILE_FORMAT, i);
5112 suffix = concat (seq, dump_file[i].extension, NULL);
5113 finish_graph_dump_file (dump_base_name, suffix);
5120 ggc_print_statistics ();
5121 stringpool_statistics ();
5122 dump_tree_statistics ();
5125 /* Free up memory for the benefit of leak detectors. */
5128 /* Language-specific end of compilation actions. */
5129 (*lang_hooks.finish) ();
5132 /* Initialize the compiler, and compile the input file. */
5136 /* The bulk of command line switch processing. */
5139 /* We cannot start timing until after options are processed since that
5140 says if we run timers or not. */
5142 timevar_start (TV_TOTAL);
5144 /* Language-independent initialization. Also sets up GC, identifier
5146 lang_independent_init ();
5148 /* Language-dependent initialization. Returns true on success. */
5149 if (lang_dependent_init (filename))
5154 /* Stop timing and print the times. */
5155 timevar_stop (TV_TOTAL);
5156 timevar_print (stderr);
5159 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5160 Decode command args, then call compile_file.
5161 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5162 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5164 It is not safe to call this function more than once. */
5167 toplev_main (argc, argv)
5173 /* Initialization of GCC's environment, and diagnostics. */
5174 general_init (argv[0]);
5176 /* Parse the options and do minimal processing; basically just
5177 enough to default flags appropriately. */
5178 parse_options_and_default_flags (argc, argv);
5180 /* Exit early if we can (e.g. -help). */
5181 if (!exit_after_options)
5184 if (errorcount || sorrycount)
5185 return (FATAL_EXIT_CODE);
5187 return (SUCCESS_EXIT_CODE);