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 "small" pic; value is 2 if we're doing
693 /* Set to the default thread-local storage (tls) model to use. */
695 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
697 /* Nonzero means generate extra code for exception handling and enable
698 exception handling. */
702 /* Nonzero means generate frame unwind info table when supported. */
704 int flag_unwind_tables = 0;
706 /* Nonzero means generate frame unwind info table exact at each insn boundary */
708 int flag_asynchronous_unwind_tables = 0;
710 /* Nonzero means don't place uninitialized global data in common storage
715 /* Nonzero means change certain warnings into errors.
716 Usually these are warnings about failure to conform to some standard. */
718 int flag_pedantic_errors = 0;
720 /* flag_schedule_insns means schedule insns within basic blocks (before
722 flag_schedule_insns_after_reload means schedule insns after
725 int flag_schedule_insns = 0;
726 int flag_schedule_insns_after_reload = 0;
728 /* The following flags have effect only for scheduling before register
731 flag_schedule_interblock means schedule insns accross basic blocks.
732 flag_schedule_speculative means allow speculative motion of non-load insns.
733 flag_schedule_speculative_load means allow speculative motion of some
735 flag_schedule_speculative_load_dangerous allows speculative motion of more
738 int flag_schedule_interblock = 1;
739 int flag_schedule_speculative = 1;
740 int flag_schedule_speculative_load = 0;
741 int flag_schedule_speculative_load_dangerous = 0;
743 int flag_single_precision_constant;
745 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
746 by a cheaper branch on a count register. */
747 int flag_branch_on_count_reg = 1;
749 /* -finhibit-size-directive inhibits output of .size for ELF.
750 This is used only for compiling crtstuff.c,
751 and it may be extended to other effects
752 needed for crtstuff.c on other systems. */
753 int flag_inhibit_size_directive = 0;
755 /* -fverbose-asm causes extra commentary information to be produced in
756 the generated assembly code (to make it more readable). This option
757 is generally only of use to those who actually need to read the
758 generated assembly code (perhaps while debugging the compiler itself).
759 -fno-verbose-asm, the default, causes the extra information
760 to be omitted and is useful when comparing two assembler files. */
762 int flag_verbose_asm = 0;
764 /* -dA causes debug commentary information to be produced in
765 the generated assembly code (to make it more readable). This option
766 is generally only of use to those who actually need to read the
767 generated assembly code (perhaps while debugging the compiler itself).
768 Currently, this switch is only used by dwarfout.c; however, it is intended
769 to be a catchall for printing debug information in the assembler file. */
771 int flag_debug_asm = 0;
773 /* -dP causes the rtl to be emitted as a comment in assembly. */
775 int flag_dump_rtl_in_asm = 0;
777 /* -fgnu-linker specifies use of the GNU linker for initializations.
778 (Or, more generally, a linker that handles initializations.)
779 -fno-gnu-linker says that collect2 will be used. */
781 int flag_gnu_linker = 0;
783 int flag_gnu_linker = 1;
786 /* Nonzero means put zero initialized data in the bss section. */
787 int flag_zero_initialized_in_bss = 1;
792 /* Enable ssa conditional constant propagation. */
793 int flag_ssa_ccp = 0;
795 /* Enable ssa aggressive dead code elimination. */
796 int flag_ssa_dce = 0;
798 /* Tag all structures with __attribute__(packed). */
799 int flag_pack_struct = 0;
801 /* Emit code to check for stack overflow; also may cause large objects
802 to be allocated dynamically. */
803 int flag_stack_check;
805 /* When non-NULL, indicates that whenever space is allocated on the
806 stack, the resulting stack pointer must not pass this
807 address---that is, for stacks that grow downward, the stack pointer
808 must always be greater than or equal to this address; for stacks
809 that grow upward, the stack pointer must be less than this address.
810 At present, the rtx may be either a REG or a SYMBOL_REF, although
811 the support provided depends on the backend. */
814 /* 0 if pointer arguments may alias each other. True in C.
815 1 if pointer arguments may not alias each other but may alias
817 2 if pointer arguments may not alias each other and may not
818 alias global variables. True in Fortran.
819 This defaults to 0 for C. */
820 int flag_argument_noalias = 0;
822 /* Nonzero if we should do (language-dependent) alias analysis.
823 Typically, this analysis will assume that expressions of certain
824 types do not alias expressions of certain other types. Only used
825 if alias analysis (in general) is enabled. */
826 int flag_strict_aliasing = 0;
828 /* Instrument functions with calls at entry and exit, for profiling. */
829 int flag_instrument_function_entry_exit = 0;
831 /* Nonzero means ignore `#ident' directives. 0 means handle them.
832 On SVR4 targets, it also controls whether or not to emit a
833 string identifying the compiler. */
835 int flag_no_ident = 0;
837 /* This will perform a peephole pass before sched2. */
838 int flag_peephole2 = 0;
840 /* This will try to guess branch probabilities. */
841 int flag_guess_branch_prob = 0;
843 /* -fbounded-pointers causes gcc to compile pointers as composite
844 objects occupying three words: the pointer value, the base address
845 of the referent object, and the address immediately beyond the end
846 of the referent object. The base and extent allow us to perform
847 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
848 int flag_bounded_pointers = 0;
850 /* -fcheck-bounds causes gcc to generate array bounds checks.
851 For C, C++: defaults to value of flag_bounded_pointers.
852 For ObjC: defaults to off.
853 For Java: defaults to on.
854 For Fortran: defaults to off.
855 For CHILL: defaults to off. */
856 int flag_bounds_check = 0;
858 /* This will attempt to merge constant section constants, if 1 only
859 string constants and constants from constant pool, if 2 also constant
861 int flag_merge_constants = 1;
863 /* If one, renumber instruction UIDs to reduce the number of
864 unused UIDs if there are a lot of instructions. If greater than
865 one, unconditionally renumber instruction UIDs. */
866 int flag_renumber_insns = 1;
868 /* Values of the -falign-* flags: how much to align labels in code.
869 0 means `use default', 1 means `don't align'.
870 For each variable, there is an _log variant which is the power
871 of two not less than the variable, for .align output. */
875 int align_loops_max_skip;
878 int align_jumps_max_skip;
880 int align_labels_log;
881 int align_labels_max_skip;
883 int align_functions_log;
885 /* Table of supported debugging formats. */
888 const char *const arg;
889 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
890 constant expression, we use NO_DEBUG in its place. */
891 const enum debug_info_type debug_type;
892 const int use_extensions_p;
893 const char *const description;
897 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
898 N_("Generate debugging info in default format") },
899 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
900 #ifdef DBX_DEBUGGING_INFO
901 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
902 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
904 #ifdef DWARF_DEBUGGING_INFO
905 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
906 { "dwarf+", DWARF_DEBUG, 1,
907 N_("Generate extended DWARF-1 format debug info") },
909 #ifdef DWARF2_DEBUGGING_INFO
910 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
912 #ifdef XCOFF_DEBUGGING_INFO
913 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
914 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
916 #ifdef SDB_DEBUGGING_INFO
917 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
919 #ifdef VMS_DEBUGGING_INFO
920 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
927 const char *const string;
930 const char *const description;
932 lang_independent_options;
936 /* Add or remove a leading underscore from user symbols. */
937 int flag_leading_underscore = -1;
939 /* The user symbol prefix after having resolved same. */
940 const char *user_label_prefix;
942 static const param_info lang_independent_params[] = {
943 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
944 { OPTION, DEFAULT, HELP },
945 #include "params.def"
950 /* A default for same. */
951 #ifndef USER_LABEL_PREFIX
952 #define USER_LABEL_PREFIX ""
955 /* Table of language-independent -f options.
956 STRING is the option name. VARIABLE is the address of the variable.
957 ON_VALUE is the value to store in VARIABLE
958 if `-fSTRING' is seen as an option.
959 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
961 static const lang_independent_options f_options[] =
963 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
964 N_("Perform DWARF2 duplicate elimination") },
965 {"float-store", &flag_float_store, 1,
966 N_("Do not store floats in registers") },
967 {"volatile", &flag_volatile, 1,
968 N_("Consider all mem refs through pointers as volatile") },
969 {"volatile-global", &flag_volatile_global, 1,
970 N_("Consider all mem refs to global data to be volatile") },
971 {"volatile-static", &flag_volatile_static, 1,
972 N_("Consider all mem refs to static data to be volatile") },
973 {"defer-pop", &flag_defer_pop, 1,
974 N_("Defer popping functions args from stack until later") },
975 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
976 N_("When possible do not generate stack frames") },
977 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
978 N_("Optimize sibling and tail recursive calls") },
979 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
980 N_("When running CSE, follow jumps to their targets") },
981 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
982 N_("When running CSE, follow conditional jumps") },
983 {"expensive-optimizations", &flag_expensive_optimizations, 1,
984 N_("Perform a number of minor, expensive optimizations") },
985 {"thread-jumps", &flag_thread_jumps, 1,
986 N_("Perform jump threading optimizations") },
987 {"strength-reduce", &flag_strength_reduce, 1,
988 N_("Perform strength reduction optimizations") },
989 {"unroll-loops", &flag_unroll_loops, 1,
990 N_("Perform loop unrolling when iteration count is known") },
991 {"unroll-all-loops", &flag_unroll_all_loops, 1,
992 N_("Perform loop unrolling for all loops") },
993 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
994 N_("Generate prefetch instructions, if available, for arrays in loops") },
995 {"move-all-movables", &flag_move_all_movables, 1,
996 N_("Force all loop invariant computations out of loops") },
997 {"reduce-all-givs", &flag_reduce_all_givs, 1,
998 N_("Strength reduce all loop general induction variables") },
999 {"writable-strings", &flag_writable_strings, 1,
1000 N_("Store strings in writable data section") },
1001 {"peephole", &flag_no_peephole, 0,
1002 N_("Enable machine specific peephole optimizations") },
1003 {"force-mem", &flag_force_mem, 1,
1004 N_("Copy memory operands into registers before using") },
1005 {"force-addr", &flag_force_addr, 1,
1006 N_("Copy memory address constants into regs before using") },
1007 {"function-cse", &flag_no_function_cse, 0,
1008 N_("Allow function addresses to be held in registers") },
1009 {"inline-functions", &flag_inline_functions, 1,
1010 N_("Integrate simple functions into their callers") },
1011 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1012 N_("Generate code for funcs even if they are fully inlined") },
1013 {"inline", &flag_no_inline, 0,
1014 N_("Pay attention to the 'inline' keyword") },
1015 {"keep-static-consts", &flag_keep_static_consts, 1,
1016 N_("Emit static const variables even if they are not used") },
1017 {"syntax-only", &flag_syntax_only, 1,
1018 N_("Check for syntax errors, then stop") },
1019 {"shared-data", &flag_shared_data, 1,
1020 N_("Mark data as shared rather than private") },
1021 {"caller-saves", &flag_caller_saves, 1,
1022 N_("Enable saving registers around function calls") },
1023 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1024 N_("Return 'short' aggregates in memory, not registers") },
1025 {"reg-struct-return", &flag_pcc_struct_return, 0,
1026 N_("Return 'short' aggregates in registers") },
1027 {"delayed-branch", &flag_delayed_branch, 1,
1028 N_("Attempt to fill delay slots of branch instructions") },
1029 {"gcse", &flag_gcse, 1,
1030 N_("Perform the global common subexpression elimination") },
1031 {"gcse-lm", &flag_gcse_lm, 1,
1032 N_("Perform enhanced load motion during global subexpression elimination") },
1033 {"gcse-sm", &flag_gcse_sm, 1,
1034 N_("Perform store motion after global subexpression elimination") },
1035 {"loop-optimize", &flag_loop_optimize, 1,
1036 N_("Perform the loop optimizations") },
1037 {"crossjumping", &flag_crossjumping, 1,
1038 N_("Perform cross-jumping optimization") },
1039 {"if-conversion", &flag_if_conversion, 1,
1040 N_("Perform conversion of conditional jumps to branchless equivalents") },
1041 {"if-conversion2", &flag_if_conversion2, 1,
1042 N_("Perform conversion of conditional jumps to conditional execution") },
1043 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1044 N_("Run CSE pass after loop optimizations") },
1045 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1046 N_("Run the loop optimizer twice") },
1047 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1048 N_("Delete useless null pointer checks") },
1049 {"schedule-insns", &flag_schedule_insns, 1,
1050 N_("Reschedule instructions before register allocation") },
1051 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1052 N_("Reschedule instructions after register allocation") },
1053 {"sched-interblock",&flag_schedule_interblock, 1,
1054 N_("Enable scheduling across basic blocks") },
1055 {"sched-spec",&flag_schedule_speculative, 1,
1056 N_("Allow speculative motion of non-loads") },
1057 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1058 N_("Allow speculative motion of some loads") },
1059 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1060 N_("Allow speculative motion of more loads") },
1061 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1062 N_("Replace add,compare,branch with branch on count reg") },
1063 {"pic", &flag_pic, 1,
1064 N_("Generate position independent code, if possible") },
1065 {"PIC", &flag_pic, 2, ""},
1066 {"exceptions", &flag_exceptions, 1,
1067 N_("Enable exception handling") },
1068 {"unwind-tables", &flag_unwind_tables, 1,
1069 N_("Just generate unwind tables for exception handling") },
1070 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1071 N_("Generate unwind tables exact at each instruction boundary") },
1072 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1073 N_("Support synchronous non-call exceptions") },
1074 {"profile-arcs", &profile_arc_flag, 1,
1075 N_("Insert arc based program profiling code") },
1076 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs, 1,
1077 N_("Avoid thread safety profiling overhead") },
1078 {"test-coverage", &flag_test_coverage, 1,
1079 N_("Create data files needed by gcov") },
1080 {"branch-probabilities", &flag_branch_probabilities, 1,
1081 N_("Use profiling information for branch probabilities") },
1082 {"profile", &profile_flag, 1,
1083 N_("Enable basic program profiling code") },
1084 {"reorder-blocks", &flag_reorder_blocks, 1,
1085 N_("Reorder basic blocks to improve code placement") },
1086 {"reorder-functions", &flag_reorder_functions, 1,
1087 N_("Reorder functions to improve code placement") },
1088 {"rename-registers", &flag_rename_registers, 1,
1089 N_("Do the register renaming optimization pass") },
1090 {"cprop-registers", &flag_cprop_registers, 1,
1091 N_("Do the register copy-propagation optimization pass") },
1092 {"common", &flag_no_common, 0,
1093 N_("Do not put uninitialized globals in the common section") },
1094 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1095 N_("Do not generate .size directives") },
1096 {"function-sections", &flag_function_sections, 1,
1097 N_("place each function into its own section") },
1098 {"data-sections", &flag_data_sections, 1,
1099 N_("place data items into their own section") },
1100 {"verbose-asm", &flag_verbose_asm, 1,
1101 N_("Add extra commentry to assembler output") },
1102 {"gnu-linker", &flag_gnu_linker, 1,
1103 N_("Output GNU ld formatted global initializers") },
1104 {"regmove", &flag_regmove, 1,
1105 N_("Enables a register move optimization") },
1106 {"optimize-register-move", &flag_regmove, 1,
1107 N_("Do the full regmove optimization pass") },
1108 {"pack-struct", &flag_pack_struct, 1,
1109 N_("Pack structure members together without holes") },
1110 {"stack-check", &flag_stack_check, 1,
1111 N_("Insert stack checking code into the program") },
1112 {"argument-alias", &flag_argument_noalias, 0,
1113 N_("Specify that arguments may alias each other & globals") },
1114 {"argument-noalias", &flag_argument_noalias, 1,
1115 N_("Assume arguments may alias globals but not each other") },
1116 {"argument-noalias-global", &flag_argument_noalias, 2,
1117 N_("Assume arguments do not alias each other or globals") },
1118 {"strict-aliasing", &flag_strict_aliasing, 1,
1119 N_("Assume strict aliasing rules apply") },
1120 {"align-loops", &align_loops, 0,
1121 N_("Align the start of loops") },
1122 {"align-jumps", &align_jumps, 0,
1123 N_("Align labels which are only reached by jumping") },
1124 {"align-labels", &align_labels, 0,
1125 N_("Align all labels") },
1126 {"align-functions", &align_functions, 0,
1127 N_("Align the start of functions") },
1128 {"merge-constants", &flag_merge_constants, 1,
1129 N_("Attempt to merge identical constants accross compilation units") },
1130 {"merge-all-constants", &flag_merge_constants, 2,
1131 N_("Attempt to merge identical constants and constant variables") },
1132 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1133 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1134 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1135 N_("Instrument function entry/exit with profiling calls") },
1136 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1137 N_("Put zero initialized data in the bss section") },
1138 {"ssa", &flag_ssa, 1,
1139 N_("Enable SSA optimizations") },
1140 {"ssa-ccp", &flag_ssa_ccp, 1,
1141 N_("Enable SSA conditional constant propagation") },
1142 {"ssa-dce", &flag_ssa_dce, 1,
1143 N_("Enable aggressive SSA dead code elimination") },
1144 {"leading-underscore", &flag_leading_underscore, 1,
1145 N_("External symbols have a leading underscore") },
1146 {"ident", &flag_no_ident, 0,
1147 N_("Process #ident directives") },
1148 { "peephole2", &flag_peephole2, 1,
1149 N_("Enables an rtl peephole pass run before sched2") },
1150 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1151 N_("Enables guessing of branch probabilities") },
1152 {"math-errno", &flag_errno_math, 1,
1153 N_("Set errno after built-in math functions") },
1154 {"trapping-math", &flag_trapping_math, 1,
1155 N_("Floating-point operations can trap") },
1156 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1157 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1158 {"bounded-pointers", &flag_bounded_pointers, 1,
1159 N_("Compile pointers as triples: value, base & end") },
1160 {"bounds-check", &flag_bounds_check, 1,
1161 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1162 {"single-precision-constant", &flag_single_precision_constant, 1,
1163 N_("Convert floating point constant to single precision constant") },
1164 {"time-report", &time_report, 1,
1165 N_("Report time taken by each compiler pass at end of run") },
1166 {"mem-report", &mem_report, 1,
1167 N_("Report on permanent memory allocation at end of run") },
1168 { "trapv", &flag_trapv, 1,
1169 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1172 /* Table of language-specific options. */
1174 static const struct lang_opt
1176 const char *const option;
1177 const char *const description;
1179 documented_lang_options[] =
1181 /* In order not to overload the --help output, the convention
1182 used here is to only describe those options which are not
1183 enabled by default. */
1186 N_("Compile just for ISO C89") },
1188 N_("Determine language standard") },
1190 { "-fsigned-bitfields", "" },
1191 { "-funsigned-bitfields",
1192 N_("Make bit-fields by unsigned by default") },
1193 { "-fno-signed-bitfields", "" },
1194 { "-fno-unsigned-bitfields","" },
1196 N_("Make 'char' be signed by default") },
1197 { "-funsigned-char",
1198 N_("Make 'char' be unsigned by default") },
1199 { "-fno-signed-char", "" },
1200 { "-fno-unsigned-char", "" },
1204 N_("Do not recognize the 'asm' keyword") },
1205 { "-fbuiltin", "" },
1207 N_("Do not recognize any built in functions") },
1209 N_("Assume normal C execution environment") },
1210 { "-fno-hosted", "" },
1212 N_("Assume that standard libraries & main might not exist") },
1213 { "-fno-freestanding", "" },
1214 { "-fcond-mismatch",
1215 N_("Allow different types as args of ? operator") },
1216 { "-fno-cond-mismatch", "" },
1217 { "-fdollars-in-identifiers",
1218 N_("Allow the use of $ inside identifiers") },
1219 { "-fno-dollars-in-identifiers", "" },
1220 { "-fpreprocessed", "" },
1221 { "-fno-preprocessed", "" },
1223 N_("Use the same size for double as for float") },
1224 { "-fno-short-double", "" },
1226 N_("Use the smallest fitting integer to hold enums") },
1227 { "-fno-short-enums", "" },
1229 N_("Override the underlying type for wchar_t to `unsigned short'") },
1230 { "-fno-short-wchar", "" },
1233 N_("Enable most warning messages") },
1234 { "-Wbad-function-cast",
1235 N_("Warn about casting functions to incompatible types") },
1236 { "-Wno-bad-function-cast", "" },
1237 { "-Wmissing-format-attribute",
1238 N_("Warn about functions which might be candidates for format attributes") },
1239 { "-Wno-missing-format-attribute", "" },
1241 N_("Warn about casts which discard qualifiers") },
1242 { "-Wno-cast-qual", "" },
1243 { "-Wchar-subscripts",
1244 N_("Warn about subscripts whose type is 'char'") },
1245 { "-Wno-char-subscripts", "" },
1247 N_("Warn if nested comments are detected") },
1248 { "-Wno-comment", "" },
1250 N_("Warn if nested comments are detected") },
1251 { "-Wno-comments", "" },
1253 N_("Warn about possibly confusing type conversions") },
1254 { "-Wno-conversion", "" },
1255 { "-Wdiv-by-zero", "" },
1256 { "-Wno-div-by-zero",
1257 N_("Do not warn about compile-time integer division by zero") },
1259 N_("Warn about testing equality of floating point numbers") },
1260 { "-Wno-float-equal", "" },
1262 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1263 { "-Wno-format", "" },
1264 { "-Wformat-extra-args", "" },
1265 { "-Wno-format-extra-args",
1266 N_("Don't warn about too many arguments to format functions") },
1267 { "-Wformat-nonliteral",
1268 N_("Warn about non-string-literal format strings") },
1269 { "-Wno-format-nonliteral", "" },
1270 { "-Wformat-security",
1271 N_("Warn about possible security problems with format functions") },
1272 { "-Wno-format-security", "" },
1273 { "-Wformat-y2k", "" },
1274 { "-Wno-format-y2k",
1275 N_("Don't warn about strftime formats yielding 2 digit years") },
1276 { "-Wimplicit-function-declaration",
1277 N_("Warn about implicit function declarations") },
1278 { "-Wno-implicit-function-declaration", "" },
1279 { "-Werror-implicit-function-declaration", "" },
1281 N_("Warn when a declaration does not specify a type") },
1282 { "-Wno-implicit-int", "" },
1283 { "-Wimplicit", "" },
1284 { "-Wno-implicit", "" },
1286 N_("Warn about the use of the #import directive") },
1287 { "-Wno-import", "" },
1288 { "-Wlong-long","" },
1290 N_("Do not warn about using 'long long' when -pedantic") },
1292 N_("Warn about suspicious declarations of main") },
1293 { "-Wno-main", "" },
1294 { "-Wmissing-braces",
1295 N_("Warn about possibly missing braces around initializers") },
1296 { "-Wno-missing-braces", "" },
1297 { "-Wmissing-declarations",
1298 N_("Warn about global funcs without previous declarations") },
1299 { "-Wno-missing-declarations", "" },
1300 { "-Wmissing-prototypes",
1301 N_("Warn about global funcs without prototypes") },
1302 { "-Wno-missing-prototypes", "" },
1304 N_("Warn about use of multicharacter literals") },
1305 { "-Wno-multichar", "" },
1306 { "-Wnested-externs",
1307 N_("Warn about externs not at file scope level") },
1308 { "-Wno-nested-externs", "" },
1310 N_("Warn about possible missing parentheses") },
1311 { "-Wno-parentheses", "" },
1312 { "-Wpointer-arith",
1313 N_("Warn about function pointer arithmetic") },
1314 { "-Wno-pointer-arith", "" },
1315 { "-Wredundant-decls",
1316 N_("Warn about multiple declarations of the same object") },
1317 { "-Wno-redundant-decls", "" },
1319 N_("Warn whenever a function's return-type defaults to int") },
1320 { "-Wno-return-type", "" },
1321 { "-Wsequence-point",
1322 N_("Warn about possible violations of sequence point rules") },
1323 { "-Wno-sequence-point", "" },
1325 N_("Warn about signed/unsigned comparisons") },
1326 { "-Wno-sign-compare", "" },
1327 { "-Wstrict-prototypes",
1328 N_("Warn about non-prototyped function decls") },
1329 { "-Wno-strict-prototypes", "" },
1331 N_("Warn about constructs whose meanings change in ISO C") },
1332 { "-Wno-traditional", "" },
1334 N_("Warn when trigraphs are encountered") },
1335 { "-Wno-trigraphs", "" },
1337 { "-Wno-undef", "" },
1338 { "-Wunknown-pragmas",
1339 N_("Warn about unrecognized pragmas") },
1340 { "-Wno-unknown-pragmas", "" },
1341 { "-Wwrite-strings",
1342 N_("Mark strings as 'const char *'") },
1343 { "-Wno-write-strings", "" },
1345 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1347 #include "options.h"
1351 /* Here is a table, controlled by the tm.h file, listing each -m switch
1352 and which bits in `target_switches' it should set or clear.
1353 If VALUE is positive, it is bits to set.
1354 If VALUE is negative, -VALUE is bits to clear.
1355 (The sign bit is not used so there is no confusion.) */
1359 const char *const name;
1361 const char *const description;
1363 target_switches[] = TARGET_SWITCHES;
1365 /* This table is similar, but allows the switch to have a value. */
1367 #ifdef TARGET_OPTIONS
1370 const char *const prefix;
1371 const char **const variable;
1372 const char *const description;
1374 target_options[] = TARGET_OPTIONS;
1377 /* Options controlling warnings. */
1379 /* Don't print warning messages. -w. */
1381 int inhibit_warnings = 0;
1383 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1385 int warn_system_headers = 0;
1387 /* Print various extra warnings. -W. */
1389 int extra_warnings = 0;
1391 /* Treat warnings as errors. -Werror. */
1393 int warnings_are_errors = 0;
1395 /* Nonzero to warn about unused variables, functions et.al. */
1397 int warn_unused_function;
1398 int warn_unused_label;
1399 int warn_unused_parameter;
1400 int warn_unused_variable;
1401 int warn_unused_value;
1403 /* Nonzero to warn about code which is never reached. */
1405 int warn_notreached;
1407 /* Nonzero to warn about variables used before they are initialized. */
1409 int warn_uninitialized;
1411 /* Nonzero means warn about all declarations which shadow others. */
1415 /* Warn if a switch on an enum, that does not have a default case,
1416 fails to have a case for every enum value. */
1420 /* Warn if a switch does not have a default case. */
1422 int warn_switch_default;
1424 /* Warn if a switch on an enum fails to have a case for every enum
1425 value (regardless of the presence or otherwise of a default case). */
1427 int warn_switch_enum;
1429 /* Nonzero means warn about function definitions that default the return type
1430 or that use a null return and have a return-type other than void. */
1432 int warn_return_type;
1434 /* Nonzero means warn about pointer casts that increase the required
1435 alignment of the target type (and might therefore lead to a crash
1436 due to a misaligned access). */
1438 int warn_cast_align;
1440 /* Nonzero means warn about any objects definitions whose size is larger
1441 than N bytes. Also want about function definitions whose returned
1442 values are larger than N bytes. The value N is in `larger_than_size'. */
1444 int warn_larger_than;
1445 HOST_WIDE_INT larger_than_size;
1447 /* Nonzero means warn if inline function is too large. */
1451 /* Warn if a function returns an aggregate,
1452 since there are often incompatible calling conventions for doing this. */
1454 int warn_aggregate_return;
1456 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1460 /* Warn when gcc pads a structure to an alignment boundary. */
1464 /* Warn when an optimization pass is disabled. */
1466 int warn_disabled_optimization;
1468 /* Warn about functions which might be candidates for attribute noreturn. */
1470 int warn_missing_noreturn;
1472 /* Nonzero means warn about uses of __attribute__((deprecated))
1475 int warn_deprecated_decl = 1;
1477 /* Likewise for -W. */
1479 static const lang_independent_options W_options[] =
1481 {"unused-function", &warn_unused_function, 1,
1482 N_("Warn when a function is unused") },
1483 {"unused-label", &warn_unused_label, 1,
1484 N_("Warn when a label is unused") },
1485 {"unused-parameter", &warn_unused_parameter, 1,
1486 N_("Warn when a function parameter is unused") },
1487 {"unused-variable", &warn_unused_variable, 1,
1488 N_("Warn when a variable is unused") },
1489 {"unused-value", &warn_unused_value, 1,
1490 N_("Warn when an expression value is unused") },
1491 {"system-headers", &warn_system_headers, 1,
1492 N_("Do not suppress warnings from system headers") },
1493 {"error", &warnings_are_errors, 1,
1494 N_("Treat all warnings as errors") },
1495 {"shadow", &warn_shadow, 1,
1496 N_("Warn when one local variable shadows another") },
1497 {"switch", &warn_switch, 1,
1498 N_("Warn about enumerated switches, with no default, missing a case") },
1499 {"switch-default", &warn_switch_default, 1,
1500 N_("Warn about enumerated switches missing a default case") },
1501 {"switch-enum", &warn_switch_enum, 1,
1502 N_("Warn about all enumerated switches missing a specific case") },
1503 {"aggregate-return", &warn_aggregate_return, 1,
1504 N_("Warn about returning structures, unions or arrays") },
1505 {"cast-align", &warn_cast_align, 1,
1506 N_("Warn about pointer casts which increase alignment") },
1507 {"unreachable-code", &warn_notreached, 1,
1508 N_("Warn about code that will never be executed") },
1509 {"uninitialized", &warn_uninitialized, 1,
1510 N_("Warn about uninitialized automatic variables") },
1511 {"inline", &warn_inline, 1,
1512 N_("Warn when an inlined function cannot be inlined") },
1513 {"packed", &warn_packed, 1,
1514 N_("Warn when the packed attribute has no effect on struct layout") },
1515 {"padded", &warn_padded, 1,
1516 N_("Warn when padding is required to align struct members") },
1517 {"disabled-optimization", &warn_disabled_optimization, 1,
1518 N_("Warn when an optimization pass is disabled") },
1519 {"deprecated-declarations", &warn_deprecated_decl, 1,
1520 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1521 {"missing-noreturn", &warn_missing_noreturn, 1,
1522 N_("Warn about functions which might be candidates for attribute noreturn") }
1526 set_Wunused (setting)
1529 warn_unused_function = setting;
1530 warn_unused_label = setting;
1531 /* Unused function parameter warnings are reported when either ``-W
1532 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1533 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1535 warn_unused_parameter = 0;
1536 else if (!warn_unused_parameter)
1537 warn_unused_parameter = -1;
1538 warn_unused_variable = setting;
1539 warn_unused_value = setting;
1542 /* The following routines are useful in setting all the flags that
1543 -ffast-math and -fno-fast-math imply. */
1546 set_fast_math_flags (int set)
1548 flag_trapping_math = !set;
1549 flag_unsafe_math_optimizations = set;
1550 flag_errno_math = !set;
1553 /* Return true iff flags are set as if -ffast-math. */
1555 fast_math_flags_set_p ()
1557 return (!flag_trapping_math
1558 && flag_unsafe_math_optimizations
1559 && !flag_errno_math);
1563 /* Output files for assembler code (real compiler output)
1564 and debugging dumps. */
1567 FILE *aux_info_file;
1568 FILE *rtl_dump_file = NULL;
1570 /* Decode the string P as an integral parameter.
1571 If the string is indeed an integer return its numeric value else
1572 issue an Invalid Option error for the option PNAME and return DEFVAL.
1573 If PNAME is zero just return DEFVAL, do not call error. */
1576 read_integral_parameter (p, pname, defval)
1581 const char *endp = p;
1585 if (ISDIGIT (*endp))
1594 error ("invalid option `%s'", pname);
1601 /* This calls abort and is used to avoid problems when abort if a macro.
1602 It is used when we need to pass the address of abort. */
1610 /* When `malloc.c' is compiled with `rcheck' defined,
1611 it calls this function to report clobberage. */
1615 const char *s ATTRIBUTE_UNUSED;
1620 /* Return the logarithm of X, base 2, considering X unsigned,
1621 if X is a power of 2. Otherwise, returns -1.
1623 This should be used via the `exact_log2' macro. */
1627 unsigned HOST_WIDE_INT x;
1630 /* Test for 0 or a power of 2. */
1631 if (x == 0 || x != (x & -x))
1633 while ((x >>= 1) != 0)
1638 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1639 If X is 0, return -1.
1641 This should be used via the floor_log2 macro. */
1645 unsigned HOST_WIDE_INT x;
1654 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1655 into ICE messages, which is much more user friendly. */
1658 crash_signal (signo)
1661 internal_error ("internal error: %s", strsignal (signo));
1664 /* Strip off a legitimate source ending from the input string NAME of
1665 length LEN. Rather than having to know the names used by all of
1666 our front ends, we strip off an ending of a period followed by
1667 up to five characters. (Java uses ".class".) */
1670 strip_off_ending (name, len)
1675 for (i = 2; i < 6 && len > i; i++)
1677 if (name[len - i] == '.')
1679 name[len - i] = '\0';
1685 /* Output a quoted string. */
1688 output_quoted_string (asm_file, string)
1692 #ifdef OUTPUT_QUOTED_STRING
1693 OUTPUT_QUOTED_STRING (asm_file, string);
1697 putc ('\"', asm_file);
1698 while ((c = *string++) != 0)
1702 if (c == '\"' || c == '\\')
1703 putc ('\\', asm_file);
1707 fprintf (asm_file, "\\%03o", (unsigned char) c);
1709 putc ('\"', asm_file);
1713 /* Output NAME into FILE after having turned it into something
1714 usable as an identifier in a target's assembly file. */
1716 output_clean_symbol_name (file, name)
1720 /* Make a copy of NAME. */
1721 char *id = (char *)xmalloc (strlen (name) + 1);
1724 /* Make it look like a valid identifier for an assembler. */
1725 clean_symbol_name (id);
1732 /* Output a file name in the form wanted by System V. */
1735 output_file_directive (asm_file, input_name)
1737 const char *input_name;
1739 int len = strlen (input_name);
1740 const char *na = input_name + len;
1742 /* NA gets INPUT_NAME sans directory names. */
1743 while (na > input_name)
1745 if (IS_DIR_SEPARATOR (na[-1]))
1750 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1751 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1753 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1754 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1756 fprintf (asm_file, "\t.file\t");
1757 output_quoted_string (asm_file, na);
1758 fputc ('\n', asm_file);
1763 /* Routine to open a dump file. Return true if the dump file is enabled. */
1766 open_dump_file (index, decl)
1767 enum dump_file_index index;
1771 const char *open_arg;
1774 if (! dump_file[index].enabled)
1777 timevar_push (TV_DUMP);
1778 if (rtl_dump_file != NULL)
1779 fclose (rtl_dump_file);
1781 sprintf (seq, DUMPFILE_FORMAT, index);
1783 if (! dump_file[index].initialized)
1785 /* If we've not initialized the files, do so now. */
1786 if (graph_dump_format != no_graph
1787 && dump_file[index].graph_dump_p)
1789 dump_name = concat (seq, dump_file[index].extension, NULL);
1790 clean_graph_dump_file (dump_base_name, dump_name);
1793 dump_file[index].initialized = 1;
1799 dump_name = concat (dump_base_name, seq,
1800 dump_file[index].extension, NULL);
1802 rtl_dump_file = fopen (dump_name, open_arg);
1803 if (rtl_dump_file == NULL)
1804 fatal_io_error ("can't open %s", dump_name);
1809 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1810 (*lang_hooks.decl_printable_name) (decl, 2),
1811 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1813 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1814 ? " (unlikely executed)"
1817 timevar_pop (TV_DUMP);
1821 /* Routine to close a dump file. */
1824 close_dump_file (index, func, insns)
1825 enum dump_file_index index;
1826 void (*func) PARAMS ((FILE *, rtx));
1829 if (! rtl_dump_file)
1832 timevar_push (TV_DUMP);
1834 && graph_dump_format != no_graph
1835 && dump_file[index].graph_dump_p)
1840 sprintf (seq, DUMPFILE_FORMAT, index);
1841 suffix = concat (seq, dump_file[index].extension, NULL);
1842 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1847 func (rtl_dump_file, insns);
1849 fflush (rtl_dump_file);
1850 fclose (rtl_dump_file);
1852 rtl_dump_file = NULL;
1853 timevar_pop (TV_DUMP);
1856 /* Do any final processing required for the declarations in VEC, of
1857 which there are LEN. We write out inline functions and variables
1858 that have been deferred until this point, but which are required.
1859 Returns non-zero if anything was put out. */
1862 wrapup_global_declarations (vec, len)
1869 int output_something = 0;
1871 for (i = 0; i < len; i++)
1875 /* We're not deferring this any longer. */
1876 DECL_DEFER_OUTPUT (decl) = 0;
1878 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1879 (*lang_hooks.finish_incomplete_decl) (decl);
1882 /* Now emit any global variables or functions that we have been
1883 putting off. We need to loop in case one of the things emitted
1884 here references another one which comes earlier in the list. */
1888 for (i = 0; i < len; i++)
1892 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1895 /* Don't write out static consts, unless we still need them.
1897 We also keep static consts if not optimizing (for debugging),
1898 unless the user specified -fno-keep-static-consts.
1899 ??? They might be better written into the debug information.
1900 This is possible when using DWARF.
1902 A language processor that wants static constants to be always
1903 written out (even if it is not used) is responsible for
1904 calling rest_of_decl_compilation itself. E.g. the C front-end
1905 calls rest_of_decl_compilation from finish_decl.
1906 One motivation for this is that is conventional in some
1907 environments to write things like:
1908 static const char rcsid[] = "... version string ...";
1909 intending to force the string to be in the executable.
1911 A language processor that would prefer to have unneeded
1912 static constants "optimized away" would just defer writing
1913 them out until here. E.g. C++ does this, because static
1914 constants are often defined in header files.
1916 ??? A tempting alternative (for both C and C++) would be
1917 to force a constant to be written if and only if it is
1918 defined in a main file, as opposed to an include file. */
1920 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1924 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1926 else if (DECL_COMDAT (decl))
1928 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1929 && (optimize || !flag_keep_static_consts
1930 || DECL_ARTIFICIAL (decl)))
1936 rest_of_decl_compilation (decl, NULL, 1, 1);
1940 if (TREE_CODE (decl) == FUNCTION_DECL
1941 && DECL_INITIAL (decl) != 0
1942 && DECL_SAVED_INSNS (decl) != 0
1943 && (flag_keep_inline_functions
1944 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1945 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1948 output_inline_function (decl);
1953 output_something = 1;
1957 return output_something;
1960 /* Issue appropriate warnings for the global declarations in VEC (of
1961 which there are LEN). Output debugging information for them. */
1964 check_global_declarations (vec, len)
1971 for (i = 0; i < len; i++)
1975 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1976 && ! TREE_ASM_WRITTEN (decl))
1977 /* Cancel the RTL for this decl so that, if debugging info
1978 output for global variables is still to come,
1979 this one will be omitted. */
1980 SET_DECL_RTL (decl, NULL_RTX);
1982 /* Warn about any function
1983 declared static but not defined.
1984 We don't warn about variables,
1985 because many programs have static variables
1986 that exist only to get some text into the object file. */
1987 if (TREE_CODE (decl) == FUNCTION_DECL
1988 && (warn_unused_function
1989 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1990 && DECL_INITIAL (decl) == 0
1991 && DECL_EXTERNAL (decl)
1992 && ! DECL_ARTIFICIAL (decl)
1993 && ! TREE_PUBLIC (decl))
1995 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1996 pedwarn_with_decl (decl,
1997 "`%s' used but never defined");
1999 warning_with_decl (decl,
2000 "`%s' declared `static' but never defined");
2001 /* This symbol is effectively an "extern" declaration now. */
2002 TREE_PUBLIC (decl) = 1;
2003 assemble_external (decl);
2006 /* Warn about static fns or vars defined but not used. */
2007 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2008 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2009 && ! TREE_USED (decl)
2010 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2011 to handle multiple external decls in different scopes. */
2012 && ! TREE_USED (DECL_NAME (decl))
2013 && ! DECL_EXTERNAL (decl)
2014 && ! TREE_PUBLIC (decl)
2015 /* Global register variables must be declared to reserve them. */
2016 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2017 /* Otherwise, ask the language. */
2018 && (*lang_hooks.decls.warn_unused_global) (decl))
2019 warning_with_decl (decl, "`%s' defined but not used");
2021 timevar_push (TV_SYMOUT);
2022 (*debug_hooks->global_decl) (decl);
2023 timevar_pop (TV_SYMOUT);
2027 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2028 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2029 INPUT_FILENAME and LINENO accordingly. */
2032 push_srcloc (file, line)
2036 struct file_stack *fs;
2038 if (input_file_stack)
2040 input_file_stack->name = input_filename;
2041 input_file_stack->line = lineno;
2044 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2045 fs->name = input_filename = file;
2046 fs->line = lineno = line;
2047 fs->next = input_file_stack;
2048 input_file_stack = fs;
2049 input_file_stack_tick++;
2052 /* Pop the top entry off the stack of presently open source files.
2053 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2059 struct file_stack *fs;
2061 fs = input_file_stack;
2062 input_file_stack = fs->next;
2064 input_file_stack_tick++;
2065 /* The initial source file is never popped. */
2066 if (!input_file_stack)
2068 input_filename = input_file_stack->name;
2069 lineno = input_file_stack->line;
2072 /* Compile an entire translation unit. Write a file of assembly
2073 output and various debugging dumps. */
2080 /* Initialize yet another pass. */
2082 init_final (main_input_filename);
2083 init_branch_prob (dump_base_name);
2085 timevar_push (TV_PARSE);
2087 /* Call the parser, which parses the entire file (calling
2088 rest_of_compilation for each function). */
2089 (*lang_hooks.parse_file) (set_yydebug);
2091 /* In case there were missing block closers,
2092 get us back to the global binding level. */
2093 (*lang_hooks.clear_binding_stack) ();
2095 /* Compilation is now finished except for writing
2096 what's left of the symbol table output. */
2097 timevar_pop (TV_PARSE);
2099 if (flag_syntax_only)
2102 globals = (*lang_hooks.decls.getdecls) ();
2104 /* Really define vars that have had only a tentative definition.
2105 Really output inline functions that must actually be callable
2106 and have not been output so far. */
2109 int len = list_length (globals);
2110 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2114 /* Process the decls in reverse order--earliest first.
2115 Put them into VEC from back to front, then take out from front. */
2117 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2118 vec[len - i - 1] = decl;
2120 wrapup_global_declarations (vec, len);
2122 /* This must occur after the loop to output deferred functions. Else
2123 the profiler initializer would not be emitted if all the functions
2124 in this compilation unit were deferred.
2126 output_func_start_profiler can not cause any additional functions or
2127 data to need to be output, so it need not be in the deferred function
2129 output_func_start_profiler ();
2131 check_global_declarations (vec, len);
2137 /* Write out any pending weak symbol declarations. */
2141 /* Do dbx symbols. */
2142 timevar_push (TV_SYMOUT);
2144 #ifdef DWARF2_UNWIND_INFO
2145 if (dwarf2out_do_frame ())
2146 dwarf2out_frame_finish ();
2149 (*debug_hooks->finish) (main_input_filename);
2150 timevar_pop (TV_SYMOUT);
2152 /* Output some stuff at end of file if nec. */
2154 dw2_output_indirect_constants ();
2156 end_final (dump_base_name);
2158 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2160 timevar_push (TV_DUMP);
2161 open_dump_file (DFI_bp, NULL);
2165 close_dump_file (DFI_bp, NULL, NULL_RTX);
2166 timevar_pop (TV_DUMP);
2170 ASM_FILE_END (asm_out_file);
2173 /* Attach a special .ident directive to the end of the file to identify
2174 the version of GCC which compiled this code. The format of the .ident
2175 string is patterned after the ones produced by native SVR4 compilers. */
2178 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2179 IDENT_ASM_OP, version_string);
2182 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2184 timevar_push (TV_DUMP);
2185 dump_combine_total_stats (rtl_dump_file);
2186 close_dump_file (DFI_combine, NULL, NULL_RTX);
2187 timevar_pop (TV_DUMP);
2191 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2192 and TYPE_DECL nodes.
2194 This does nothing for local (non-static) variables, unless the
2195 variable is a register variable with an ASMSPEC. In that case, or
2196 if the variable is not an automatic, it sets up the RTL and
2197 outputs any assembler code (label definition, storage allocation
2198 and initialization).
2200 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2201 the assembler symbol name to be used. TOP_LEVEL is nonzero
2202 if this declaration is not within a function. */
2205 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2207 const char *asmspec;
2211 /* Declarations of variables, and of functions defined elsewhere. */
2213 /* The most obvious approach, to put an #ifndef around where
2214 this macro is used, doesn't work since it's inside a macro call. */
2215 #ifndef ASM_FINISH_DECLARE_OBJECT
2216 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2219 /* We deferred calling assemble_alias so that we could collect
2220 other attributes such as visibility. Emit the alias now. */
2223 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2226 alias = TREE_VALUE (TREE_VALUE (alias));
2227 alias = get_identifier (TREE_STRING_POINTER (alias));
2228 assemble_alias (decl, alias);
2232 /* Forward declarations for nested functions are not "external",
2233 but we need to treat them as if they were. */
2234 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2235 || TREE_CODE (decl) == FUNCTION_DECL)
2237 timevar_push (TV_VARCONST);
2240 make_decl_rtl (decl, asmspec);
2242 /* Don't output anything when a tentative file-scope definition
2243 is seen. But at end of compilation, do output code for them. */
2244 if (at_end || !DECL_DEFER_OUTPUT (decl))
2245 assemble_variable (decl, top_level, at_end, 0);
2246 if (decl == last_assemble_variable_decl)
2248 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2252 timevar_pop (TV_VARCONST);
2254 else if (DECL_REGISTER (decl) && asmspec != 0)
2256 if (decode_reg_name (asmspec) >= 0)
2258 SET_DECL_RTL (decl, NULL_RTX);
2259 make_decl_rtl (decl, asmspec);
2263 error ("invalid register name `%s' for register variable", asmspec);
2264 DECL_REGISTER (decl) = 0;
2269 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2270 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2271 && TREE_CODE (decl) == TYPE_DECL)
2273 timevar_push (TV_SYMOUT);
2274 dbxout_symbol (decl, 0);
2275 timevar_pop (TV_SYMOUT);
2278 #ifdef SDB_DEBUGGING_INFO
2279 else if (write_symbols == SDB_DEBUG && top_level
2280 && TREE_CODE (decl) == TYPE_DECL)
2282 timevar_push (TV_SYMOUT);
2283 sdbout_symbol (decl, 0);
2284 timevar_pop (TV_SYMOUT);
2289 /* Called after finishing a record, union or enumeral type. */
2292 rest_of_type_compilation (type, toplev)
2293 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2297 tree type ATTRIBUTE_UNUSED;
2298 int toplev ATTRIBUTE_UNUSED;
2301 timevar_push (TV_SYMOUT);
2302 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2303 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2304 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2306 #ifdef SDB_DEBUGGING_INFO
2307 if (write_symbols == SDB_DEBUG)
2308 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2310 #ifdef DWARF2_DEBUGGING_INFO
2311 if ((write_symbols == DWARF2_DEBUG
2312 || write_symbols == VMS_AND_DWARF2_DEBUG)
2314 dwarf2out_decl (TYPE_STUB_DECL (type));
2316 timevar_pop (TV_SYMOUT);
2319 /* This is called from finish_function (within langhooks.parse_file)
2320 after each top-level definition is parsed.
2321 It is supposed to compile that function or variable
2322 and output the assembler code for it.
2323 After we return, the tree storage is freed. */
2326 rest_of_compilation (decl)
2332 int rebuild_label_notes_after_reload;
2333 int register_life_up_to_date;
2335 timevar_push (TV_REST_OF_COMPILATION);
2337 /* Now that we're out of the frontend, we shouldn't have any more
2338 CONCATs anywhere. */
2339 generating_concat_p = 0;
2341 /* When processing delayed functions, prepare_function_start() won't
2342 have been run to re-initialize it. */
2343 cse_not_expected = ! optimize;
2345 /* First, make sure that NOTE_BLOCK is set correctly for each
2346 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2347 if (!cfun->x_whole_function_mode_p)
2350 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2351 tree in sensible shape. So, we just recalculate it here. */
2352 if (cfun->x_whole_function_mode_p)
2357 /* If we are reconsidering an inline function
2358 at the end of compilation, skip the stuff for making it inline. */
2360 if (DECL_SAVED_INSNS (decl) == 0)
2366 /* If this is nested inside an inlined external function, pretend
2367 it was only declared. Since we cannot inline such functions,
2368 generating code for this one is not only not necessary but will
2369 confuse some debugging output writers. */
2370 for (parent = DECL_CONTEXT (current_function_decl);
2371 parent != NULL_TREE;
2372 parent = get_containing_scope (parent))
2373 if (TREE_CODE (parent) == FUNCTION_DECL
2374 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2376 DECL_INITIAL (decl) = 0;
2377 goto exit_rest_of_compilation;
2380 /* If requested, consider whether to make this function inline. */
2381 if ((DECL_INLINE (decl) && !flag_no_inline)
2382 || flag_inline_functions)
2384 timevar_push (TV_INTEGRATION);
2385 lose = function_cannot_inline_p (decl);
2386 timevar_pop (TV_INTEGRATION);
2387 if (lose || ! optimize)
2389 if (warn_inline && DECL_INLINE (decl))
2390 warning_with_decl (decl, lose);
2391 DECL_ABSTRACT_ORIGIN (decl) = 0;
2392 /* Don't really compile an extern inline function.
2393 If we can't make it inline, pretend
2394 it was only declared. */
2395 if (DECL_EXTERNAL (decl))
2397 DECL_INITIAL (decl) = 0;
2398 goto exit_rest_of_compilation;
2402 /* ??? Note that this has the effect of making it look
2403 like "inline" was specified for a function if we choose
2404 to inline it. This isn't quite right, but it's
2405 probably not worth the trouble to fix. */
2406 inlinable = DECL_INLINE (decl) = 1;
2409 insns = get_insns ();
2411 /* Dump the rtl code if we are dumping rtl. */
2413 if (open_dump_file (DFI_rtl, decl))
2415 if (DECL_SAVED_INSNS (decl))
2416 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2417 close_dump_file (DFI_rtl, print_rtl, insns);
2420 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2421 sorts of eh initialization. Delay this until after the
2422 initial rtl dump so that we can see the original nesting. */
2423 convert_from_eh_region_ranges ();
2425 /* If function is inline, and we don't yet know whether to
2426 compile it by itself, defer decision till end of compilation.
2427 finish_compilation will call rest_of_compilation again
2428 for those functions that need to be output. Also defer those
2429 functions that we are supposed to defer. */
2432 || (DECL_INLINE (decl)
2433 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2434 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2435 && ! flag_keep_inline_functions)
2436 || DECL_EXTERNAL (decl))))
2437 DECL_DEFER_OUTPUT (decl) = 1;
2439 if (DECL_INLINE (decl))
2440 /* DWARF wants separate debugging info for abstract and
2441 concrete instances of all inline functions, including those
2442 declared inline but not inlined, and those inlined even
2443 though they weren't declared inline. Conveniently, that's
2444 what DECL_INLINE means at this point. */
2445 (*debug_hooks->deferred_inline_function) (decl);
2447 if (DECL_DEFER_OUTPUT (decl))
2449 /* If -Wreturn-type, we have to do a bit of compilation. We just
2450 want to call cleanup the cfg to figure out whether or not we can
2451 fall off the end of the function; we do the minimum amount of
2452 work necessary to make that safe. */
2453 if (warn_return_type)
2455 int saved_optimize = optimize;
2458 rebuild_jump_labels (insns);
2459 find_exception_handler_labels ();
2460 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2461 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2462 optimize = saved_optimize;
2464 /* CFG is no longer maintained up-to-date. */
2465 free_bb_for_insn ();
2468 current_function_nothrow = nothrow_function_p ();
2469 if (current_function_nothrow)
2470 /* Now we know that this can't throw; set the flag for the benefit
2471 of other functions later in this translation unit. */
2472 TREE_NOTHROW (current_function_decl) = 1;
2474 timevar_push (TV_INTEGRATION);
2475 save_for_inline (decl);
2476 timevar_pop (TV_INTEGRATION);
2477 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2478 goto exit_rest_of_compilation;
2481 /* If specified extern inline but we aren't inlining it, we are
2482 done. This goes for anything that gets here with DECL_EXTERNAL
2483 set, not just things with DECL_INLINE. */
2484 if (DECL_EXTERNAL (decl))
2485 goto exit_rest_of_compilation;
2488 /* If we're emitting a nested function, make sure its parent gets
2489 emitted as well. Doing otherwise confuses debug info. */
2492 for (parent = DECL_CONTEXT (current_function_decl);
2493 parent != NULL_TREE;
2494 parent = get_containing_scope (parent))
2495 if (TREE_CODE (parent) == FUNCTION_DECL)
2496 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2499 /* We are now committed to emitting code for this function. Do any
2500 preparation, such as emitting abstract debug info for the inline
2501 before it gets mangled by optimization. */
2502 if (DECL_INLINE (decl))
2503 (*debug_hooks->outlining_inline_function) (decl);
2505 /* Remove any notes we don't need. That will make iterating
2506 over the instruction sequence faster, and allow the garbage
2507 collector to reclaim the memory used by the notes. */
2508 remove_unnecessary_notes ();
2513 /* Initialize some variables used by the optimizers. */
2514 init_function_for_compilation ();
2516 if (! DECL_DEFER_OUTPUT (decl))
2517 TREE_ASM_WRITTEN (decl) = 1;
2519 /* Now that integrate will no longer see our rtl, we need not
2520 distinguish between the return value of this function and the
2521 return value of called functions. Also, we can remove all SETs
2522 of subregs of hard registers; they are only here because of
2523 integrate. Also, we can now initialize pseudos intended to
2524 carry magic hard reg data throughout the function. */
2525 rtx_equal_function_value_matters = 0;
2526 purge_hard_subreg_sets (get_insns ());
2528 /* Early return if there were errors. We can run afoul of our
2529 consistency checks, and there's not really much point in fixing them.
2530 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2531 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2532 || errorcount || sorrycount)
2533 goto exit_rest_of_compilation;
2535 timevar_push (TV_JUMP);
2536 open_dump_file (DFI_sibling, decl);
2537 insns = get_insns ();
2538 rebuild_jump_labels (insns);
2539 find_exception_handler_labels ();
2540 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2542 delete_unreachable_blocks ();
2544 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2545 note_prediction_to_br_prob ();
2547 /* We may have potential sibling or tail recursion sites. Select one
2548 (of possibly multiple) methods of performing the call. */
2549 if (flag_optimize_sibling_calls)
2552 optimize_sibling_and_tail_recursive_calls ();
2554 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2555 notes before simplifying cfg and we must do lowering after sibcall
2556 that unhides parts of RTL chain and cleans up the CFG.
2558 Until sibcall is replaced by tree-level optimizer, lets just
2559 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2560 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2561 if (GET_CODE (insn) == NOTE
2562 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2565 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2566 timevar_pop (TV_JUMP);
2568 /* Complete generation of exception handling code. */
2569 find_exception_handler_labels ();
2572 timevar_push (TV_JUMP);
2573 open_dump_file (DFI_eh, decl);
2575 finish_eh_generation ();
2577 close_dump_file (DFI_eh, print_rtl, get_insns ());
2578 timevar_pop (TV_JUMP);
2581 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2582 generation, which might create new sets. */
2583 emit_initial_value_sets ();
2586 /* If we are doing position-independent code generation, now
2587 is the time to output special prologues and epilogues.
2588 We do not want to do this earlier, because it just clutters
2589 up inline functions with meaningless insns. */
2594 insns = get_insns ();
2596 /* Copy any shared structure that should not be shared. */
2597 unshare_all_rtl (current_function_decl, insns);
2599 #ifdef SETJMP_VIA_SAVE_AREA
2600 /* This must be performed before virtual register instantiation.
2601 Please be aware the everything in the compiler that can look
2602 at the RTL up to this point must understand that REG_SAVE_AREA
2603 is just like a use of the REG contained inside. */
2604 if (current_function_calls_alloca)
2605 optimize_save_area_alloca (insns);
2608 /* Instantiate all virtual registers. */
2609 instantiate_virtual_regs (current_function_decl, insns);
2611 open_dump_file (DFI_jump, decl);
2613 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2614 are initialized and to compute whether control can drop off the end
2617 timevar_push (TV_JUMP);
2618 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2619 before jump optimization switches branch directions. */
2620 expected_value_to_br_prob ();
2622 reg_scan (insns, max_reg_num (), 0);
2623 rebuild_jump_labels (insns);
2624 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2626 dump_flow_info (rtl_dump_file);
2627 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2628 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2630 /* CFG is no longer maintained up-to-date. */
2631 free_bb_for_insn ();
2632 copy_loop_headers (insns);
2633 purge_line_number_notes (insns);
2635 timevar_pop (TV_JUMP);
2636 close_dump_file (DFI_jump, print_rtl, insns);
2638 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2639 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2641 goto exit_rest_of_compilation;
2644 /* Long term, this should probably move before the jump optimizer too,
2645 but I didn't want to disturb the rtl_dump_and_exit and related
2646 stuff at this time. */
2647 if (optimize > 0 && flag_ssa)
2649 /* Convert to SSA form. */
2651 timevar_push (TV_TO_SSA);
2652 open_dump_file (DFI_ssa, decl);
2654 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2655 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2658 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2659 timevar_pop (TV_TO_SSA);
2661 /* Perform sparse conditional constant propagation, if requested. */
2664 timevar_push (TV_SSA_CCP);
2665 open_dump_file (DFI_ssa_ccp, decl);
2669 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2670 timevar_pop (TV_SSA_CCP);
2673 /* It would be useful to cleanup the CFG at this point, but block
2674 merging and possibly other transformations might leave a PHI
2675 node in the middle of a basic block, which is a strict no-no. */
2677 /* The SSA implementation uses basic block numbers in its phi
2678 nodes. Thus, changing the control-flow graph or the basic
2679 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2680 may cause problems. */
2684 /* Remove dead code. */
2686 timevar_push (TV_SSA_DCE);
2687 open_dump_file (DFI_ssa_dce, decl);
2689 insns = get_insns ();
2690 ssa_eliminate_dead_code ();
2692 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2693 timevar_pop (TV_SSA_DCE);
2696 /* Convert from SSA form. */
2698 timevar_push (TV_FROM_SSA);
2699 open_dump_file (DFI_ussa, decl);
2701 convert_from_ssa ();
2702 /* New registers have been created. Rescan their usage. */
2703 reg_scan (insns, max_reg_num (), 1);
2705 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2706 timevar_pop (TV_FROM_SSA);
2709 /* CFG is no longer maintained up-to-date. */
2710 free_bb_for_insn ();
2713 timevar_push (TV_JUMP);
2715 if (flag_delete_null_pointer_checks || flag_if_conversion)
2717 open_dump_file (DFI_null, decl);
2718 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2720 dump_flow_info (rtl_dump_file);
2721 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2723 /* Try to identify useless null pointer tests and delete them. */
2724 if (flag_delete_null_pointer_checks)
2725 delete_null_pointer_checks (insns);
2727 timevar_push (TV_IFCVT);
2728 if (flag_if_conversion)
2730 timevar_pop (TV_IFCVT);
2731 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2732 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2735 /* Jump optimization, and the removal of NULL pointer checks, may
2736 have reduced the number of instructions substantially. CSE, and
2737 future passes, allocate arrays whose dimensions involve the
2738 maximum instruction UID, so if we can reduce the maximum UID
2739 we'll save big on memory. */
2740 renumber_insns (rtl_dump_file);
2742 compute_bb_for_insn (get_max_uid ());
2743 timevar_pop (TV_JUMP);
2745 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2749 /* Perform common subexpression elimination.
2750 Nonzero value from `cse_main' means that jumps were simplified
2751 and some code may now be unreachable, so do
2752 jump optimization again. */
2756 open_dump_file (DFI_cse, decl);
2758 dump_flow_info (rtl_dump_file);
2759 timevar_push (TV_CSE);
2761 reg_scan (insns, max_reg_num (), 1);
2763 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2765 rebuild_jump_labels (insns);
2766 purge_all_dead_edges (0);
2768 delete_trivially_dead_insns (insns, max_reg_num ());
2770 /* If we are not running more CSE passes, then we are no longer
2771 expecting CSE to be run. But always rerun it in a cheap mode. */
2772 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2774 if (tem || optimize > 1)
2775 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2776 /* Try to identify useless null pointer tests and delete them. */
2777 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2779 timevar_push (TV_JUMP);
2781 if (flag_delete_null_pointer_checks)
2782 delete_null_pointer_checks (insns);
2783 /* CFG is no longer maintained up-to-date. */
2784 timevar_pop (TV_JUMP);
2787 /* The second pass of jump optimization is likely to have
2788 removed a bunch more instructions. */
2789 renumber_insns (rtl_dump_file);
2790 compute_bb_for_insn (get_max_uid ());
2792 timevar_pop (TV_CSE);
2793 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2796 open_dump_file (DFI_addressof, decl);
2798 purge_addressof (insns);
2800 purge_all_dead_edges (0);
2801 reg_scan (insns, max_reg_num (), 1);
2803 close_dump_file (DFI_addressof, print_rtl, insns);
2807 /* Perform global cse. */
2809 if (optimize > 0 && flag_gcse)
2811 int save_csb, save_cfj;
2814 timevar_push (TV_GCSE);
2815 open_dump_file (DFI_gcse, decl);
2817 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2818 tem = gcse_main (insns, rtl_dump_file);
2819 rebuild_jump_labels (insns);
2820 delete_trivially_dead_insns (insns, max_reg_num ());
2822 save_csb = flag_cse_skip_blocks;
2823 save_cfj = flag_cse_follow_jumps;
2824 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2826 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2828 if (flag_expensive_optimizations)
2830 timevar_push (TV_CSE);
2831 reg_scan (insns, max_reg_num (), 1);
2832 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2833 purge_all_dead_edges (0);
2834 delete_trivially_dead_insns (insns, max_reg_num ());
2835 timevar_pop (TV_CSE);
2836 cse_not_expected = !flag_rerun_cse_after_loop;
2839 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2840 things up. Then possibly re-run CSE again. */
2844 timevar_push (TV_JUMP);
2845 rebuild_jump_labels (insns);
2846 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2847 timevar_pop (TV_JUMP);
2849 if (flag_expensive_optimizations)
2851 timevar_push (TV_CSE);
2852 reg_scan (insns, max_reg_num (), 1);
2853 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2854 purge_all_dead_edges (0);
2855 delete_trivially_dead_insns (insns, max_reg_num ());
2856 timevar_pop (TV_CSE);
2860 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2861 timevar_pop (TV_GCSE);
2864 flag_cse_skip_blocks = save_csb;
2865 flag_cse_follow_jumps = save_cfj;
2866 #ifdef ENABLE_CHECKING
2867 verify_flow_info ();
2871 /* Move constant computations out of loops. */
2873 if (optimize > 0 && flag_loop_optimize)
2875 timevar_push (TV_LOOP);
2876 delete_dead_jumptables ();
2877 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2878 open_dump_file (DFI_loop, decl);
2879 /* CFG is no longer maintained up-to-date. */
2880 free_bb_for_insn ();
2882 if (flag_rerun_loop_opt)
2884 cleanup_barriers ();
2886 /* We only want to perform unrolling once. */
2887 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2889 /* The first call to loop_optimize makes some instructions
2890 trivially dead. We delete those instructions now in the
2891 hope that doing so will make the heuristics in loop work
2892 better and possibly speed up compilation. */
2893 delete_trivially_dead_insns (insns, max_reg_num ());
2895 /* The regscan pass is currently necessary as the alias
2896 analysis code depends on this information. */
2897 reg_scan (insns, max_reg_num (), 1);
2899 cleanup_barriers ();
2900 loop_optimize (insns, rtl_dump_file,
2901 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2902 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2904 /* Loop can create trivially dead instructions. */
2905 delete_trivially_dead_insns (insns, max_reg_num ());
2906 close_dump_file (DFI_loop, print_rtl, insns);
2907 timevar_pop (TV_LOOP);
2912 /* Do control and data flow analysis; wrote some of the results to
2915 timevar_push (TV_FLOW);
2916 open_dump_file (DFI_cfg, decl);
2918 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2920 dump_flow_info (rtl_dump_file);
2921 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2922 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2924 /* It may make more sense to mark constant functions after dead code is
2925 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2926 may insert code making function non-constant, but we still must consider
2927 it as constant, otherwise -fbranch-probabilities will not read data back.
2929 life_analyzis rarely eliminates modification of external memory.
2932 mark_constant_function ();
2934 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2936 /* Do branch profiling and static profile estimation passes. */
2937 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
2941 timevar_push (TV_BRANCH_PROB);
2942 open_dump_file (DFI_bp, decl);
2943 if (cfun->arc_profile || flag_branch_probabilities)
2946 /* Discover and record the loop depth at the head of each basic
2947 block. The loop infrastructure does the real job for us. */
2948 flow_loops_find (&loops, LOOP_TREE);
2950 /* Estimate using heuristics if no profiling info is available. */
2951 if (flag_guess_branch_prob)
2952 estimate_probability (&loops);
2955 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2957 flow_loops_free (&loops);
2958 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2959 timevar_pop (TV_BRANCH_PROB);
2964 timevar_push (TV_CSE2);
2965 open_dump_file (DFI_cse2, decl);
2967 dump_flow_info (rtl_dump_file);
2969 if (flag_rerun_cse_after_loop)
2971 timevar_push (TV_JUMP);
2973 reg_scan (insns, max_reg_num (), 0);
2975 timevar_push (TV_IFCVT);
2976 cleanup_cfg (CLEANUP_EXPENSIVE);
2977 if (flag_if_conversion)
2979 timevar_pop (TV_IFCVT);
2981 timevar_pop (TV_JUMP);
2982 /* CFG is no longer maintained up-to-date. */
2983 reg_scan (insns, max_reg_num (), 0);
2984 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2985 purge_all_dead_edges (0);
2986 delete_trivially_dead_insns (insns, max_reg_num ());
2990 timevar_push (TV_JUMP);
2991 rebuild_jump_labels (insns);
2992 cleanup_cfg (CLEANUP_EXPENSIVE);
2993 timevar_pop (TV_JUMP);
2997 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2998 timevar_pop (TV_CSE2);
3003 cse_not_expected = 1;
3005 open_dump_file (DFI_life, decl);
3008 check_function_return_warnings ();
3010 #ifdef ENABLE_CHECKING
3011 verify_flow_info ();
3013 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3015 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3016 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3017 timevar_pop (TV_FLOW);
3021 if (warn_uninitialized || extra_warnings)
3023 uninitialized_vars_warning (DECL_INITIAL (decl));
3025 setjmp_args_warning ();
3031 if (initialize_uninitialized_subregs ())
3033 /* Insns were inserted, so things might look a bit different. */
3034 insns = get_insns ();
3035 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3036 PROP_LOG_LINKS | PROP_REG_INFO
3037 | PROP_DEATH_NOTES);
3041 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3045 /* If -opt, try combining insns through substitution. */
3049 int rebuild_jump_labels_after_combine = 0;
3051 timevar_push (TV_COMBINE);
3052 open_dump_file (DFI_combine, decl);
3054 rebuild_jump_labels_after_combine
3055 = combine_instructions (insns, max_reg_num ());
3057 /* Combining insns may have turned an indirect jump into a
3058 direct jump. Rebuid the JUMP_LABEL fields of jumping
3060 if (rebuild_jump_labels_after_combine)
3062 timevar_push (TV_JUMP);
3063 rebuild_jump_labels (insns);
3064 timevar_pop (TV_JUMP);
3066 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3069 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3070 timevar_pop (TV_COMBINE);
3075 /* Rerun if-conversion, as combine may have simplified things enough to
3076 now meet sequence length restrictions. */
3077 if (flag_if_conversion)
3079 timevar_push (TV_IFCVT);
3080 open_dump_file (DFI_ce, decl);
3086 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3087 timevar_pop (TV_IFCVT);
3090 /* Register allocation pre-pass, to reduce number of moves
3091 necessary for two-address machines. */
3092 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3094 timevar_push (TV_REGMOVE);
3095 open_dump_file (DFI_regmove, decl);
3097 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3099 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3100 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3101 timevar_pop (TV_REGMOVE);
3106 /* Do unconditional splitting before register allocation to allow machine
3107 description to add extra information not needed previously. */
3108 split_all_insns (1);
3110 /* Any of the several passes since flow1 will have munged register
3111 lifetime data a bit. */
3112 register_life_up_to_date = 0;
3114 #ifdef OPTIMIZE_MODE_SWITCHING
3115 timevar_push (TV_MODE_SWITCH);
3118 optimize_mode_switching (NULL);
3121 timevar_pop (TV_MODE_SWITCH);
3124 timevar_push (TV_SCHED);
3126 #ifdef INSN_SCHEDULING
3128 /* Print function header into sched dump now
3129 because doing the sched analysis makes some of the dump. */
3130 if (optimize > 0 && flag_schedule_insns)
3132 open_dump_file (DFI_sched, decl);
3134 /* Do control and data sched analysis,
3135 and write some of the results to dump file. */
3137 schedule_insns (rtl_dump_file);
3139 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3141 /* Register lifetime information was updated as part of verifying
3143 register_life_up_to_date = 1;
3146 timevar_pop (TV_SCHED);
3150 /* Determine if the current function is a leaf before running reload
3151 since this can impact optimizations done by the prologue and
3152 epilogue thus changing register elimination offsets. */
3153 current_function_is_leaf = leaf_function_p ();
3155 timevar_push (TV_LOCAL_ALLOC);
3156 open_dump_file (DFI_lreg, decl);
3158 /* Allocate pseudo-regs that are used only within 1 basic block.
3160 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3161 jump optimizer after register allocation and reloading are finished. */
3163 if (! register_life_up_to_date)
3164 recompute_reg_usage (insns, ! optimize_size);
3166 /* Allocate the reg_renumber array. */
3167 allocate_reg_info (max_regno, FALSE, TRUE);
3169 /* And the reg_equiv_memory_loc array. */
3170 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3172 allocate_initial_values (reg_equiv_memory_loc);
3174 regclass (insns, max_reg_num (), rtl_dump_file);
3175 rebuild_label_notes_after_reload = local_alloc ();
3177 timevar_pop (TV_LOCAL_ALLOC);
3179 if (dump_file[DFI_lreg].enabled)
3181 timevar_push (TV_DUMP);
3183 dump_flow_info (rtl_dump_file);
3184 dump_local_alloc (rtl_dump_file);
3186 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3187 timevar_pop (TV_DUMP);
3192 timevar_push (TV_GLOBAL_ALLOC);
3193 open_dump_file (DFI_greg, decl);
3195 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3196 pass fixing up any insns that are invalid. */
3199 failure = global_alloc (rtl_dump_file);
3202 build_insn_chain (insns);
3203 failure = reload (insns, 0);
3206 timevar_pop (TV_GLOBAL_ALLOC);
3208 if (dump_file[DFI_greg].enabled)
3210 timevar_push (TV_DUMP);
3212 dump_global_regs (rtl_dump_file);
3214 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3215 timevar_pop (TV_DUMP);
3219 goto exit_rest_of_compilation;
3223 open_dump_file (DFI_postreload, decl);
3225 /* Do a very simple CSE pass over just the hard registers. */
3228 timevar_push (TV_RELOAD_CSE_REGS);
3229 reload_cse_regs (insns);
3230 timevar_pop (TV_RELOAD_CSE_REGS);
3233 /* Register allocation and reloading may have turned an indirect jump into
3234 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3235 jumping instructions. */
3236 if (rebuild_label_notes_after_reload)
3238 timevar_push (TV_JUMP);
3240 rebuild_jump_labels (insns);
3241 purge_all_dead_edges (0);
3243 timevar_pop (TV_JUMP);
3246 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3248 /* Re-create the death notes which were deleted during reload. */
3249 timevar_push (TV_FLOW2);
3250 open_dump_file (DFI_flow2, decl);
3252 #ifdef ENABLE_CHECKING
3253 verify_flow_info ();
3256 /* If optimizing, then go ahead and split insns now. */
3258 split_all_insns (0);
3260 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3262 /* On some machines, the prologue and epilogue code, or parts thereof,
3263 can be represented as RTL. Doing so lets us schedule insns between
3264 it and the rest of the code and also allows delayed branch
3265 scheduling to operate in the epilogue. */
3266 thread_prologue_and_epilogue_insns (insns);
3270 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3271 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3272 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3274 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3275 even for machines with possibly nonzero RETURN_POPS_ARGS
3276 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3277 push instructions will have popping returns. */
3278 #ifndef PUSH_ROUNDING
3279 if (!ACCUMULATE_OUTGOING_ARGS)
3281 combine_stack_adjustments ();
3286 flow2_completed = 1;
3288 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3289 timevar_pop (TV_FLOW2);
3291 #ifdef HAVE_peephole2
3292 if (optimize > 0 && flag_peephole2)
3294 timevar_push (TV_PEEPHOLE2);
3295 open_dump_file (DFI_peephole2, decl);
3297 peephole2_optimize (rtl_dump_file);
3299 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3300 timevar_pop (TV_PEEPHOLE2);
3304 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3306 timevar_push (TV_RENAME_REGISTERS);
3307 open_dump_file (DFI_rnreg, decl);
3309 if (flag_rename_registers)
3310 regrename_optimize ();
3311 if (flag_cprop_registers)
3312 copyprop_hardreg_forward ();
3314 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3315 timevar_pop (TV_RENAME_REGISTERS);
3318 if (flag_if_conversion2)
3320 timevar_push (TV_IFCVT2);
3321 open_dump_file (DFI_ce2, decl);
3325 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3326 timevar_pop (TV_IFCVT2);
3330 split_all_insns (1);
3333 #ifdef INSN_SCHEDULING
3334 if (optimize > 0 && flag_schedule_insns_after_reload)
3336 timevar_push (TV_SCHED2);
3337 open_dump_file (DFI_sched2, decl);
3339 /* Do control and data sched analysis again,
3340 and write some more of the results to dump file. */
3342 split_all_insns (1);
3344 schedule_insns (rtl_dump_file);
3346 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3347 timevar_pop (TV_SCHED2);
3353 #ifdef LEAF_REGISTERS
3354 current_function_uses_only_leaf_regs
3355 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3359 timevar_push (TV_REG_STACK);
3360 open_dump_file (DFI_stack, decl);
3362 reg_to_stack (insns, rtl_dump_file);
3364 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3365 timevar_pop (TV_REG_STACK);
3371 timevar_push (TV_REORDER_BLOCKS);
3372 open_dump_file (DFI_bbro, decl);
3374 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3375 splitting possibly introduced more crossjumping oppurtuntities.
3376 Except that we can't actually run crossjumping without running
3377 another DCE pass, which we can't do after reg-stack. */
3378 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3379 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3380 if (flag_reorder_blocks)
3382 reorder_basic_blocks ();
3383 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3386 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3387 timevar_pop (TV_REORDER_BLOCKS);
3389 compute_alignments ();
3391 /* CFG is no longer maintained up-to-date. */
3392 free_bb_for_insn ();
3394 /* If a machine dependent reorganization is needed, call it. */
3395 #ifdef MACHINE_DEPENDENT_REORG
3396 timevar_push (TV_MACH_DEP);
3397 open_dump_file (DFI_mach, decl);
3399 MACHINE_DEPENDENT_REORG (insns);
3401 close_dump_file (DFI_mach, print_rtl, insns);
3402 timevar_pop (TV_MACH_DEP);
3407 purge_line_number_notes (insns);
3408 cleanup_barriers ();
3410 /* If a scheduling pass for delayed branches is to be done,
3411 call the scheduling code. */
3414 if (optimize > 0 && flag_delayed_branch)
3416 timevar_push (TV_DBR_SCHED);
3417 open_dump_file (DFI_dbr, decl);
3419 dbr_schedule (insns, rtl_dump_file);
3421 close_dump_file (DFI_dbr, print_rtl, insns);
3422 timevar_pop (TV_DBR_SCHED);
3428 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3429 timevar_push (TV_SHORTEN_BRANCH);
3430 split_all_insns_noflow ();
3431 timevar_pop (TV_SHORTEN_BRANCH);
3434 convert_to_eh_region_ranges ();
3436 /* Shorten branches. */
3437 timevar_push (TV_SHORTEN_BRANCH);
3438 shorten_branches (get_insns ());
3439 timevar_pop (TV_SHORTEN_BRANCH);
3441 current_function_nothrow = nothrow_function_p ();
3442 if (current_function_nothrow)
3443 /* Now we know that this can't throw; set the flag for the benefit
3444 of other functions later in this translation unit. */
3445 TREE_NOTHROW (current_function_decl) = 1;
3447 /* Now turn the rtl into assembler code. */
3449 timevar_push (TV_FINAL);
3454 /* Get the function's name, as described by its RTL. This may be
3455 different from the DECL_NAME name used in the source file. */
3457 x = DECL_RTL (decl);
3458 if (GET_CODE (x) != MEM)
3461 if (GET_CODE (x) != SYMBOL_REF)
3463 fnname = XSTR (x, 0);
3465 assemble_start_function (decl, fnname);
3466 final_start_function (insns, asm_out_file, optimize);
3467 final (insns, asm_out_file, optimize, 0);
3468 final_end_function ();
3470 #ifdef IA64_UNWIND_INFO
3471 /* ??? The IA-64 ".handlerdata" directive must be issued before
3472 the ".endp" directive that closes the procedure descriptor. */
3473 output_function_exception_table ();
3476 assemble_end_function (decl, fnname);
3478 #ifndef IA64_UNWIND_INFO
3479 /* Otherwise, it feels unclean to switch sections in the middle. */
3480 output_function_exception_table ();
3484 fflush (asm_out_file);
3486 /* Release all memory allocated by flow. */
3487 free_basic_block_vars (0);
3489 /* Release all memory held by regsets now. */
3490 regset_release_memory ();
3492 timevar_pop (TV_FINAL);
3496 /* Write DBX symbols if requested. */
3498 /* Note that for those inline functions where we don't initially
3499 know for certain that we will be generating an out-of-line copy,
3500 the first invocation of this routine (rest_of_compilation) will
3501 skip over this code by doing a `goto exit_rest_of_compilation;'.
3502 Later on, finish_compilation will call rest_of_compilation again
3503 for those inline functions that need to have out-of-line copies
3504 generated. During that call, we *will* be routed past here. */
3506 timevar_push (TV_SYMOUT);
3507 (*debug_hooks->function_decl) (decl);
3508 timevar_pop (TV_SYMOUT);
3510 exit_rest_of_compilation:
3512 /* In case the function was not output,
3513 don't leave any temporary anonymous types
3514 queued up for sdb output. */
3515 #ifdef SDB_DEBUGGING_INFO
3516 if (write_symbols == SDB_DEBUG)
3517 sdbout_types (NULL_TREE);
3520 reload_completed = 0;
3521 flow2_completed = 0;
3524 timevar_push (TV_FINAL);
3526 /* Clear out the insn_length contents now that they are no
3528 init_insn_lengths ();
3530 /* Show no temporary slots allocated. */
3533 free_basic_block_vars (0);
3534 free_bb_for_insn ();
3536 timevar_pop (TV_FINAL);
3538 /* Make sure volatile mem refs aren't considered valid operands for
3539 arithmetic insns. We must call this here if this is a nested inline
3540 function, since the above code leaves us in the init_recog state
3541 (from final.c), and the function context push/pop code does not
3542 save/restore volatile_ok.
3544 ??? Maybe it isn't necessary for expand_start_function to call this
3545 anymore if we do it here? */
3547 init_recog_no_volatile ();
3549 /* We're done with this function. Free up memory if we can. */
3550 free_after_parsing (cfun);
3551 if (! DECL_DEFER_OUTPUT (decl))
3553 free_after_compilation (cfun);
3555 /* Clear integrate.c's pointer to the cfun structure we just
3557 DECL_SAVED_INSNS (decl) = 0;
3563 timevar_pop (TV_REST_OF_COMPILATION);
3573 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3574 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3575 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3576 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3577 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3578 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"));
3579 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3581 for (i = ARRAY_SIZE (f_options); i--;)
3583 const char *description = f_options[i].description;
3585 if (description != NULL && *description != 0)
3586 printf (" -f%-21s %s\n",
3587 f_options[i].string, _(description));
3590 printf (_(" -O[number] Set optimization level to [number]\n"));
3591 printf (_(" -Os Optimize for space rather than speed\n"));
3592 for (i = LAST_PARAM; i--;)
3594 const char *description = compiler_params[i].help;
3595 const int length = 21 - strlen (compiler_params[i].option);
3597 if (description != NULL && *description != 0)
3598 printf (" --param %s=<value>%.*s%s\n",
3599 compiler_params[i].option,
3600 length > 0 ? length : 1, " ",
3603 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3604 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3605 printf (_(" -w Suppress warnings\n"));
3606 printf (_(" -W Enable extra warnings\n"));
3608 for (i = ARRAY_SIZE (W_options); i--;)
3610 const char *description = W_options[i].description;
3612 if (description != NULL && *description != 0)
3613 printf (" -W%-21s %s\n",
3614 W_options[i].string, _(description));
3617 printf (_(" -Wunused Enable unused warnings\n"));
3618 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3619 printf (_(" -p Enable function profiling\n"));
3620 printf (_(" -o <file> Place output into <file> \n"));
3622 -G <number> Put global and static data smaller than <number>\n\
3623 bytes into a special section (on some targets)\n"));
3625 for (i = ARRAY_SIZE (debug_args); i--;)
3627 if (debug_args[i].description != NULL)
3628 printf (" -g%-21s %s\n",
3629 debug_args[i].arg, _(debug_args[i].description));
3632 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3633 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3634 printf (_(" -version Display the compiler's version\n"));
3635 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3636 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3637 #if defined INSN_SCHEDULING
3638 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3640 printf (_(" --help Display this information\n"));
3645 /* Display descriptions of language specific options.
3646 If there is no description, note that there is an undocumented option.
3647 If the description is empty, do not display anything. (This allows
3648 options to be deliberately undocumented, for whatever reason).
3649 If the option string is missing, then this is a marker, indicating
3650 that the description string is in fact the name of a language, whose
3651 language specific options are to follow. */
3653 if (ARRAY_SIZE (documented_lang_options) > 1)
3655 printf (_("\nLanguage specific options:\n"));
3657 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3659 const char *description = documented_lang_options[i].description;
3660 const char *option = documented_lang_options[i].option;
3662 if (description == NULL)
3667 printf (_(" %-23.23s [undocumented]\n"), option);
3669 else if (*description == 0)
3671 else if (option == NULL)
3675 (_("\nThere are undocumented %s specific options as well.\n"),
3679 printf (_("\n Options for %s:\n"), description);
3684 printf (" %-23.23s %s\n", option, _(description));
3689 printf (_("\nThere are undocumented %s specific options as well.\n"),
3692 display_target_options ();
3696 display_target_options ()
3699 static bool displayed = false;
3701 /* Avoid double printing for --help --target-help. */
3706 if (ARRAY_SIZE (target_switches) > 1
3707 #ifdef TARGET_OPTIONS
3708 || ARRAY_SIZE (target_options) > 1
3716 printf (_("\nTarget specific options:\n"));
3718 for (i = ARRAY_SIZE (target_switches); i--;)
3720 const char *option = target_switches[i].name;
3721 const char *description = target_switches[i].description;
3723 if (option == NULL || *option == 0)
3725 else if (description == NULL)
3730 printf (_(" -m%-23.23s [undocumented]\n"), option);
3732 else if (*description != 0)
3733 doc += printf (" -m%-23.23s %s\n", option, _(description));
3736 #ifdef TARGET_OPTIONS
3737 for (i = ARRAY_SIZE (target_options); i--;)
3739 const char *option = target_options[i].prefix;
3740 const char *description = target_options[i].description;
3742 if (option == NULL || *option == 0)
3744 else if (description == NULL)
3749 printf (_(" -m%-23.23s [undocumented]\n"), option);
3751 else if (*description != 0)
3752 doc += printf (" -m%-23.23s %s\n", option, _(description));
3758 printf (_("\nThere are undocumented target specific options as well.\n"));
3760 printf (_(" They exist, but they are not documented.\n"));
3765 /* Parse a -d... command line switch. */
3768 decode_d_option (arg)
3777 for (i = 0; i < (int) DFI_MAX; ++i)
3778 dump_file[i].enabled = 1;
3784 flag_print_asm_name = 1;
3787 flag_dump_rtl_in_asm = 1;
3788 flag_print_asm_name = 1;
3791 graph_dump_format = vcg;
3794 rtl_dump_and_exit = 1;
3799 case 'D': /* These are handled by the preprocessor. */
3805 for (i = 0; i < (int) DFI_MAX; ++i)
3806 if (c == dump_file[i].debug_switch)
3808 dump_file[i].enabled = 1;
3813 warning ("unrecognized gcc debugging option: %c", c);
3818 /* Parse a -f... command line switch. ARG is the value after the -f.
3819 It is safe to access 'ARG - 2' to generate the full switch name.
3820 Return the number of strings consumed. */
3823 decode_f_option (arg)
3827 const char *option_value = NULL;
3829 /* Search for the option in the table of binary f options. */
3830 for (j = ARRAY_SIZE (f_options); j--;)
3832 if (!strcmp (arg, f_options[j].string))
3834 *f_options[j].variable = f_options[j].on_value;
3838 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3839 && ! strcmp (arg + 3, f_options[j].string))
3841 *f_options[j].variable = ! f_options[j].on_value;
3846 if (!strcmp (arg, "fast-math"))
3847 set_fast_math_flags (1);
3848 else if (!strcmp (arg, "no-fast-math"))
3849 set_fast_math_flags (0);
3850 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3851 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3854 read_integral_parameter (option_value, arg - 2,
3856 set_param_value ("max-inline-insns", val);
3858 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
3860 if (strcmp (option_value, "global-dynamic") == 0)
3861 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
3862 else if (strcmp (option_value, "local-dynamic") == 0)
3863 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
3864 else if (strcmp (option_value, "initial-exec") == 0)
3865 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
3866 else if (strcmp (option_value, "local-exec") == 0)
3867 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
3869 warning ("`%s': unknown tls-model option", arg - 2);
3871 #ifdef INSN_SCHEDULING
3872 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3873 fix_sched_param ("verbose", option_value);
3875 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3876 fix_register (option_value, 1, 1);
3877 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3878 fix_register (option_value, 0, 1);
3879 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3880 fix_register (option_value, 0, 0);
3881 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3882 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3883 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3885 = read_integral_parameter (option_value, arg - 2, align_functions);
3886 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3887 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3888 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3890 = read_integral_parameter (option_value, arg - 2, align_labels);
3891 else if ((option_value
3892 = skip_leading_substring (arg, "stack-limit-register=")))
3894 int reg = decode_reg_name (option_value);
3896 error ("unrecognized register name `%s'", option_value);
3898 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3900 else if ((option_value
3901 = skip_leading_substring (arg, "stack-limit-symbol=")))
3904 nm = ggc_strdup (option_value);
3905 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3907 else if ((option_value
3908 = skip_leading_substring (arg, "message-length=")))
3909 output_set_maximum_length
3910 (&global_dc->buffer, read_integral_parameter
3911 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3912 else if ((option_value
3913 = skip_leading_substring (arg, "diagnostics-show-location=")))
3915 if (!strcmp (option_value, "once"))
3916 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3917 else if (!strcmp (option_value, "every-line"))
3918 diagnostic_prefixing_rule (global_dc)
3919 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3921 error ("unrecognized option `%s'", arg - 2);
3923 else if (!strcmp (arg, "no-stack-limit"))
3924 stack_limit_rtx = NULL_RTX;
3925 else if (!strcmp (arg, "preprocessed"))
3926 /* Recognise this switch but do nothing. This prevents warnings
3927 about an unrecognized switch if cpplib has not been linked in. */
3935 /* Parse a -W... command line switch. ARG is the value after the -W.
3936 It is safe to access 'ARG - 2' to generate the full switch name.
3937 Return the number of strings consumed. */
3940 decode_W_option (arg)
3943 const char *option_value = NULL;
3946 /* Search for the option in the table of binary W options. */
3948 for (j = ARRAY_SIZE (W_options); j--;)
3950 if (!strcmp (arg, W_options[j].string))
3952 *W_options[j].variable = W_options[j].on_value;
3956 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3957 && ! strcmp (arg + 3, W_options[j].string))
3959 *W_options[j].variable = ! W_options[j].on_value;
3964 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3965 warning ("-Wid-clash-LEN is no longer supported");
3966 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3968 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3970 warn_larger_than = larger_than_size != -1;
3972 else if (!strcmp (arg, "unused"))
3976 else if (!strcmp (arg, "no-unused"))
3986 /* Parse a -g... command line switch. ARG is the value after the -g.
3987 It is safe to access 'ARG - 2' to generate the full switch name.
3988 Return the number of strings consumed. */
3991 decode_g_option (arg)
3994 static unsigned level = 0;
3995 /* A lot of code assumes write_symbols == NO_DEBUG if the
3996 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3997 of what debugging type has been selected). This records the
3998 selected type. It is an error to specify more than one
4000 static enum debug_info_type selected_debug_type = NO_DEBUG;
4001 /* Non-zero if debugging format has been explicitly set.
4002 -g and -ggdb don't explicitly set the debugging format so
4003 -gdwarf -g3 is equivalent to -gdwarf3. */
4004 static int type_explicitly_set_p = 0;
4005 /* Indexed by enum debug_info_type. */
4006 static const char *const debug_type_names[] =
4008 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4011 /* The maximum admissible debug level value. */
4012 static const unsigned max_debug_level = 3;
4014 /* Look up ARG in the table. */
4015 for (da = debug_args; da->arg; da++)
4017 const int da_len = strlen (da->arg);
4019 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4021 enum debug_info_type type = da->debug_type;
4022 const char *p = arg + da_len;
4024 if (*p && ! ISDIGIT (*p))
4027 /* A debug flag without a level defaults to level 2.
4028 Note we do not want to call read_integral_parameter
4029 for that case since it will call atoi which
4032 ??? We may want to generalize the interface to
4033 read_integral_parameter to better handle this case
4034 if this case shows up often. */
4036 level = read_integral_parameter (p, 0, max_debug_level + 1);
4038 level = (level == 0) ? 2 : level;
4040 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4042 error ("use -gdwarf -g%d for DWARF v1, level %d",
4045 error ("use -gdwarf-2 for DWARF v2");
4048 if (level > max_debug_level)
4051 ignoring option `%s' due to invalid debug level specification",
4053 level = debug_info_level;
4056 if (type == NO_DEBUG)
4058 type = PREFERRED_DEBUGGING_TYPE;
4060 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4062 #ifdef DWARF2_DEBUGGING_INFO
4063 type = DWARF2_DEBUG;
4065 #ifdef DBX_DEBUGGING_INFO
4072 if (type == NO_DEBUG)
4073 warning ("`%s': unknown or unsupported -g option", arg - 2);
4075 /* Does it conflict with an already selected type? */
4076 if (type_explicitly_set_p
4077 /* -g/-ggdb don't conflict with anything. */
4078 && da->debug_type != NO_DEBUG
4079 && type != selected_debug_type)
4080 warning ("`%s' ignored, conflicts with `-g%s'",
4081 arg - 2, debug_type_names[(int) selected_debug_type]);
4084 /* If the format has already been set, -g/-ggdb
4085 only change the debug level. */
4086 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4087 /* Don't change debugging type. */
4091 selected_debug_type = type;
4092 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4095 write_symbols = (level == 0
4097 : selected_debug_type);
4098 use_gnu_debug_info_extensions = da->use_extensions_p;
4099 debug_info_level = (enum debug_info_level) level;
4112 /* Decode the first argument in the argv as a language-independent option.
4113 Return the number of strings consumed. */
4116 independent_decode_option (argc, argv)
4120 char *arg = argv[0];
4122 if (arg[0] != '-' || arg[1] == 0)
4134 if (!strcmp (arg, "-help"))
4137 exit_after_options = 1;
4140 if (!strcmp (arg, "-target-help"))
4142 display_target_options ();
4143 exit_after_options = 1;
4146 if (!strcmp (arg, "-version"))
4148 print_version (stderr, "");
4149 exit_after_options = 1;
4152 /* Handle '--param <name>=<value>'. */
4153 if (strcmp (arg, "-param") == 0)
4159 error ("-param option missing argument");
4163 /* Get the '<name>=<value>' parameter. */
4165 /* Look for the `='. */
4166 equal = strchr (arg, '=');
4168 error ("invalid --param option: %s", arg);
4173 /* Zero out the `=' sign so that we get two separate strings. */
4175 /* Figure out what value is specified. */
4176 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4177 if (val != INVALID_PARAM_VAL)
4178 set_param_value (arg, val);
4180 error ("invalid parameter value `%s'", equal + 1);
4195 /* Already been treated in main (). Do nothing. */
4199 set_target_switch (arg + 1);
4203 return decode_f_option (arg + 1);
4206 return decode_g_option (arg + 1);
4209 if (!strcmp (arg, "dumpbase"))
4214 dump_base_name = argv[1];
4218 decode_d_option (arg + 1);
4222 if (!strcmp (arg, "pedantic"))
4224 else if (!strcmp (arg, "pedantic-errors"))
4225 flag_pedantic_errors = pedantic = 1;
4226 else if (arg[1] == 0)
4233 if (!strcmp (arg, "quiet"))
4240 if (!strcmp (arg, "version"))
4248 inhibit_warnings = 1;
4257 /* We save the value of warn_uninitialized, since if they put
4258 -Wuninitialized on the command line, we need to generate a
4259 warning about not using it without also specifying -O. */
4260 if (warn_uninitialized != 1)
4261 warn_uninitialized = 2;
4264 return decode_W_option (arg + 1);
4268 if (!strncmp (arg, "aux-info", 8))
4275 aux_info_file_name = argv[1];
4276 flag_gen_aux_info = 1;
4279 else if (arg[8] == '=')
4281 aux_info_file_name = arg + 9;
4282 flag_gen_aux_info = 1;
4297 asm_file_name = argv[1];
4312 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4317 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4321 if (g_switch_val == -1)
4325 g_switch_set = TRUE;
4326 g_switch_value = g_switch_val;
4336 /* Decode -m switches. */
4337 /* Decode the switch -mNAME. */
4340 set_target_switch (name)
4344 int valid_target_option = 0;
4346 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4347 if (!strcmp (target_switches[j].name, name))
4349 if (target_switches[j].value < 0)
4350 target_flags &= ~-target_switches[j].value;
4352 target_flags |= target_switches[j].value;
4353 valid_target_option = 1;
4356 #ifdef TARGET_OPTIONS
4357 if (!valid_target_option)
4358 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4360 int len = strlen (target_options[j].prefix);
4361 if (!strncmp (target_options[j].prefix, name, len))
4363 *target_options[j].variable = name + len;
4364 valid_target_option = 1;
4369 if (!valid_target_option)
4370 error ("invalid option `%s'", name);
4373 /* Print version information to FILE.
4374 Each line begins with INDENT (for the case where FILE is the
4375 assembler output file). */
4378 print_version (file, indent)
4383 #define __VERSION__ "[?]"
4387 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4389 "%s%s%s version %s (%s) compiled by CC.\n"
4391 , indent, *indent != 0 ? " " : "",
4392 lang_hooks.name, version_string, TARGET_NAME,
4393 indent, __VERSION__);
4396 /* Print an option value and return the adjusted position in the line.
4397 ??? We don't handle error returns from fprintf (disk full); presumably
4398 other code will catch a disk full though. */
4401 print_single_switch (file, pos, max, indent, sep, term, type, name)
4404 const char *indent, *sep, *term, *type, *name;
4406 /* The ultrix fprintf returns 0 on success, so compute the result we want
4407 here since we need it for the following test. */
4408 int len = strlen (sep) + strlen (type) + strlen (name);
4413 fprintf (file, "%s", term);
4418 fprintf (file, "%s", indent);
4419 pos = strlen (indent);
4421 fprintf (file, "%s%s%s", sep, type, name);
4426 /* Print active target switches to FILE.
4427 POS is the current cursor position and MAX is the size of a "line".
4428 Each line begins with INDENT and ends with TERM.
4429 Each switch is separated from the next by SEP. */
4432 print_switch_values (file, pos, max, indent, sep, term)
4435 const char *indent, *sep, *term;
4440 /* Print the options as passed. */
4442 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4443 _("options passed: "), "");
4445 for (p = &save_argv[1]; *p != NULL; p++)
4449 if (strcmp (*p, "-o") == 0)
4455 if (strcmp (*p, "-quiet") == 0)
4457 if (strcmp (*p, "-version") == 0)
4462 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4465 fprintf (file, "%s", term);
4467 /* Print the -f and -m options that have been enabled.
4468 We don't handle language specific options but printing argv
4471 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4472 _("options enabled: "), "");
4474 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4475 if (*f_options[j].variable == f_options[j].on_value)
4476 pos = print_single_switch (file, pos, max, indent, sep, term,
4477 "-f", f_options[j].string);
4479 /* Print target specific options. */
4481 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4482 if (target_switches[j].name[0] != '\0'
4483 && target_switches[j].value > 0
4484 && ((target_switches[j].value & target_flags)
4485 == target_switches[j].value))
4487 pos = print_single_switch (file, pos, max, indent, sep, term,
4488 "-m", target_switches[j].name);
4491 #ifdef TARGET_OPTIONS
4492 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4493 if (*target_options[j].variable != NULL)
4496 sprintf (prefix, "-m%s", target_options[j].prefix);
4497 pos = print_single_switch (file, pos, max, indent, sep, term,
4498 prefix, *target_options[j].variable);
4502 fprintf (file, "%s", term);
4505 /* Open assembly code output file. Do this even if -fsyntax-only is
4506 on, because then the driver will have provided the name of a
4507 temporary file or bit bucket for us. NAME is the file specified on
4508 the command line, possibly NULL. */
4510 init_asm_output (name)
4513 if (name == NULL && asm_file_name == 0)
4514 asm_out_file = stdout;
4517 if (asm_file_name == 0)
4519 int len = strlen (dump_base_name);
4520 char *dumpname = (char *) xmalloc (len + 6);
4521 memcpy (dumpname, dump_base_name, len + 1);
4522 strip_off_ending (dumpname, len);
4523 strcat (dumpname, ".s");
4524 asm_file_name = dumpname;
4526 if (!strcmp (asm_file_name, "-"))
4527 asm_out_file = stdout;
4529 asm_out_file = fopen (asm_file_name, "w");
4530 if (asm_out_file == 0)
4531 fatal_io_error ("can't open %s for writing", asm_file_name);
4534 #ifdef IO_BUFFER_SIZE
4535 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4536 _IOFBF, IO_BUFFER_SIZE);
4539 if (!flag_syntax_only)
4541 #ifdef ASM_FILE_START
4542 ASM_FILE_START (asm_out_file);
4545 #ifdef ASM_COMMENT_START
4546 if (flag_verbose_asm)
4548 /* Print the list of options in effect. */
4549 print_version (asm_out_file, ASM_COMMENT_START);
4550 print_switch_values (asm_out_file, 0, MAX_LINE,
4551 ASM_COMMENT_START, " ", "\n");
4552 /* Add a blank line here so it appears in assembler output but not
4554 fprintf (asm_out_file, "\n");
4560 /* Initialization of the front end environment, before command line
4561 options are parsed. Signal handlers, internationalization etc.
4562 ARGV0 is main's argv[0]. */
4564 general_init (argv0)
4569 p = argv0 + strlen (argv0);
4570 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4574 xmalloc_set_program_name (progname);
4576 gcc_init_libintl ();
4578 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4580 signal (SIGSEGV, crash_signal);
4583 signal (SIGILL, crash_signal);
4586 signal (SIGBUS, crash_signal);
4589 signal (SIGABRT, crash_signal);
4591 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4592 signal (SIGIOT, crash_signal);
4595 signal (SIGFPE, crash_signal);
4598 /* Initialize the diagnostics reporting machinery, so option parsing
4599 can give warnings and errors. */
4600 diagnostic_initialize (global_dc);
4603 /* Parse command line options and set default flag values, called
4604 after language-independent option-independent initialization. Do
4605 minimal options processing. Outputting diagnostics is OK, but GC
4606 and identifier hashtables etc. are not initialized yet. */
4608 parse_options_and_default_flags (argc, argv)
4614 /* Save in case md file wants to emit args as a comment. */
4618 /* Initialize register usage now so switches may override. */
4621 /* Register the language-independent parameters. */
4622 add_params (lang_independent_params, LAST_PARAM);
4624 /* Perform language-specific options initialization. */
4625 (*lang_hooks.init_options) ();
4627 /* Scan to see what optimization level has been specified. That will
4628 determine the default value of many flags. */
4629 for (i = 1; i < argc; i++)
4631 if (!strcmp (argv[i], "-O"))
4636 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4638 /* Handle -Os, -O2, -O3, -O69, ... */
4639 char *p = &argv[i][2];
4641 if ((p[0] == 's') && (p[1] == 0))
4645 /* Optimizing for size forces optimize to be 2. */
4650 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4651 if (optimize_val != -1)
4653 optimize = optimize_val;
4662 flag_merge_constants = 0;
4668 flag_thread_jumps = 1;
4670 flag_delayed_branch = 1;
4672 #ifdef CAN_DEBUG_WITHOUT_FP
4673 flag_omit_frame_pointer = 1;
4675 flag_guess_branch_prob = 1;
4676 flag_cprop_registers = 1;
4677 flag_loop_optimize = 1;
4678 flag_crossjumping = 1;
4679 flag_if_conversion = 1;
4680 flag_if_conversion2 = 1;
4685 flag_optimize_sibling_calls = 1;
4686 flag_cse_follow_jumps = 1;
4687 flag_cse_skip_blocks = 1;
4689 flag_expensive_optimizations = 1;
4690 flag_strength_reduce = 1;
4691 flag_rerun_cse_after_loop = 1;
4692 flag_rerun_loop_opt = 1;
4693 flag_caller_saves = 1;
4696 #ifdef INSN_SCHEDULING
4697 flag_schedule_insns = 1;
4698 flag_schedule_insns_after_reload = 1;
4701 flag_strict_aliasing = 1;
4702 flag_delete_null_pointer_checks = 1;
4703 flag_reorder_blocks = 1;
4704 flag_reorder_functions = 1;
4709 flag_inline_functions = 1;
4710 flag_rename_registers = 1;
4713 if (optimize < 2 || optimize_size)
4718 align_functions = 1;
4721 /* Initialize whether `char' is signed. */
4722 flag_signed_char = DEFAULT_SIGNED_CHAR;
4723 #ifdef DEFAULT_SHORT_ENUMS
4724 /* Initialize how much space enums occupy, by default. */
4725 flag_short_enums = DEFAULT_SHORT_ENUMS;
4728 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4731 set_target_switch ("");
4733 /* Unwind tables are always present in an ABI-conformant IA-64
4734 object file, so the default should be ON. */
4735 #ifdef IA64_UNWIND_INFO
4736 flag_unwind_tables = IA64_UNWIND_INFO;
4739 #ifdef OPTIMIZATION_OPTIONS
4740 /* Allow default optimizations to be specified on a per-machine basis. */
4741 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4744 /* Perform normal command line switch decoding. */
4745 for (i = 1; i < argc;)
4748 int indep_processed;
4750 /* Give the language a chance to decode the option for itself. */
4751 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4753 if (lang_processed >= 0)
4754 /* Now see if the option also has a language independent meaning.
4755 Some options are both language specific and language independent,
4757 indep_processed = independent_decode_option (argc - i, argv + i);
4760 lang_processed = -lang_processed;
4761 indep_processed = 0;
4764 if (lang_processed || indep_processed)
4765 i += MAX (lang_processed, indep_processed);
4768 const char *option = NULL;
4769 const char *lang = NULL;
4772 /* It is possible that the command line switch is not valid for the
4773 current language, but it is valid for another language. In order
4774 to be compatible with previous versions of the compiler (which
4775 did not issue an error message in this case) we check for this
4776 possibility here. If we do find a match, then if extra_warnings
4777 is set we generate a warning message, otherwise we will just
4778 ignore the option. */
4779 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4781 option = documented_lang_options[j].option;
4784 lang = documented_lang_options[j].description;
4785 else if (! strncmp (argv[i], option, strlen (option)))
4789 if (j != ARRAY_SIZE (documented_lang_options))
4793 warning ("ignoring command line option '%s'", argv[i]);
4796 ("(it is valid for %s but not the selected language)",
4800 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4801 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4803 error ("unrecognized option `%s'", argv[i]);
4809 if (flag_no_inline == 2)
4812 flag_really_no_inline = flag_no_inline;
4814 /* Set flag_no_inline before the post_options () hook. The C front
4815 ends use it to determine tree inlining defaults. FIXME: such
4816 code should be lang-independent when all front ends use tree
4817 inlining, in which case it, and this condition, should be moved
4818 to the top of process_options() instead. */
4821 /* Inlining does not work if not optimizing,
4822 so force it not to be done. */
4826 /* The c_decode_option function and decode_option hook set
4827 this to `2' if -Wall is used, so we can avoid giving out
4828 lots of errors for people who don't realize what -Wall does. */
4829 if (warn_uninitialized == 1)
4830 warning ("-Wuninitialized is not supported without -O");
4833 if (flag_really_no_inline == 2)
4834 flag_really_no_inline = flag_no_inline;
4836 /* All command line options have been parsed; allow the front end to
4837 perform consistency checks, etc. */
4838 (*lang_hooks.post_options) ();
4841 /* Process the options that have been parsed. */
4845 #ifdef OVERRIDE_OPTIONS
4846 /* Some machines may reject certain combinations of options. */
4850 /* Set up the align_*_log variables, defaulting them to 1 if they
4851 were still unset. */
4852 if (align_loops <= 0) align_loops = 1;
4853 if (align_loops_max_skip > align_loops || !align_loops)
4854 align_loops_max_skip = align_loops - 1;
4855 align_loops_log = floor_log2 (align_loops * 2 - 1);
4856 if (align_jumps <= 0) align_jumps = 1;
4857 if (align_jumps_max_skip > align_jumps || !align_jumps)
4858 align_jumps_max_skip = align_jumps - 1;
4859 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4860 if (align_labels <= 0) align_labels = 1;
4861 align_labels_log = floor_log2 (align_labels * 2 - 1);
4862 if (align_labels_max_skip > align_labels || !align_labels)
4863 align_labels_max_skip = align_labels - 1;
4864 if (align_functions <= 0) align_functions = 1;
4865 align_functions_log = floor_log2 (align_functions * 2 - 1);
4867 /* Unrolling all loops implies that standard loop unrolling must also
4869 if (flag_unroll_all_loops)
4870 flag_unroll_loops = 1;
4871 /* Loop unrolling requires that strength_reduction be on also. Silently
4872 turn on strength reduction here if it isn't already on. Also, the loop
4873 unrolling code assumes that cse will be run after loop, so that must
4874 be turned on also. */
4875 if (flag_unroll_loops)
4877 flag_strength_reduce = 1;
4878 flag_rerun_cse_after_loop = 1;
4881 if (flag_non_call_exceptions)
4882 flag_asynchronous_unwind_tables = 1;
4883 if (flag_asynchronous_unwind_tables)
4884 flag_unwind_tables = 1;
4886 /* Warn about options that are not supported on this machine. */
4887 #ifndef INSN_SCHEDULING
4888 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4889 warning ("instruction scheduling not supported on this target machine");
4892 if (flag_delayed_branch)
4893 warning ("this target machine does not have delayed branches");
4896 /* Some operating systems do not allow profiling without a frame
4898 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4900 && flag_omit_frame_pointer)
4902 error ("profiling does not work without a frame pointer");
4903 flag_omit_frame_pointer = 0;
4906 user_label_prefix = USER_LABEL_PREFIX;
4907 if (flag_leading_underscore != -1)
4909 /* If the default prefix is more complicated than "" or "_",
4910 issue a warning and ignore this option. */
4911 if (user_label_prefix[0] == 0 ||
4912 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4914 user_label_prefix = flag_leading_underscore ? "_" : "";
4917 warning ("-f%sleading-underscore not supported on this target machine",
4918 flag_leading_underscore ? "" : "no-");
4921 /* If we are in verbose mode, write out the version and maybe all the
4922 option flags in use. */
4925 print_version (stderr, "");
4927 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4933 if (flag_syntax_only)
4935 write_symbols = NO_DEBUG;
4939 /* Now we know write_symbols, set up the debug hooks based on it.
4940 By default we do nothing for debug output. */
4941 #if defined(DBX_DEBUGGING_INFO)
4942 if (write_symbols == DBX_DEBUG)
4943 debug_hooks = &dbx_debug_hooks;
4945 #if defined(XCOFF_DEBUGGING_INFO)
4946 if (write_symbols == XCOFF_DEBUG)
4947 debug_hooks = &xcoff_debug_hooks;
4949 #ifdef SDB_DEBUGGING_INFO
4950 if (write_symbols == SDB_DEBUG)
4951 debug_hooks = &sdb_debug_hooks;
4953 #ifdef DWARF_DEBUGGING_INFO
4954 if (write_symbols == DWARF_DEBUG)
4955 debug_hooks = &dwarf_debug_hooks;
4957 #ifdef DWARF2_DEBUGGING_INFO
4958 if (write_symbols == DWARF2_DEBUG)
4959 debug_hooks = &dwarf2_debug_hooks;
4961 #ifdef VMS_DEBUGGING_INFO
4962 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4963 debug_hooks = &vmsdbg_debug_hooks;
4966 /* If auxiliary info generation is desired, open the output file.
4967 This goes in the same directory as the source file--unlike
4968 all the other output files. */
4969 if (flag_gen_aux_info)
4971 aux_info_file = fopen (aux_info_file_name, "w");
4972 if (aux_info_file == 0)
4973 fatal_io_error ("can't open %s", aux_info_file_name);
4976 if (! targetm.have_named_sections)
4978 if (flag_function_sections)
4980 warning ("-ffunction-sections not supported for this target");
4981 flag_function_sections = 0;
4983 if (flag_data_sections)
4985 warning ("-fdata-sections not supported for this target");
4986 flag_data_sections = 0;
4990 if (flag_function_sections && profile_flag)
4992 warning ("-ffunction-sections disabled; it makes profiling impossible");
4993 flag_function_sections = 0;
4996 #ifndef HAVE_prefetch
4997 if (flag_prefetch_loop_arrays)
4999 warning ("-fprefetch-loop-arrays not supported for this target");
5000 flag_prefetch_loop_arrays = 0;
5003 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5005 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5006 flag_prefetch_loop_arrays = 0;
5010 /* This combination of options isn't handled for i386 targets and doesn't
5011 make much sense anyway, so don't allow it. */
5012 if (flag_prefetch_loop_arrays && optimize_size)
5014 warning ("-fprefetch-loop-arrays is not supported with -Os");
5015 flag_prefetch_loop_arrays = 0;
5018 #ifndef OBJECT_FORMAT_ELF
5019 if (flag_function_sections && write_symbols != NO_DEBUG)
5020 warning ("-ffunction-sections may affect debugging on some targets");
5024 /* Language-independent initialization, before language-dependent
5027 lang_independent_init ()
5029 /* Initialize the garbage-collector, and string pools. */
5031 ggc_add_rtx_root (&stack_limit_rtx, 1);
5032 ggc_add_tree_root (¤t_function_decl, 1);
5033 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5038 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5039 || debug_info_level == DINFO_LEVEL_VERBOSE
5040 #ifdef VMS_DEBUGGING_INFO
5041 /* Enable line number info for traceback */
5042 || debug_info_level > DINFO_LEVEL_NONE
5044 || flag_test_coverage
5045 || warn_notreached);
5051 init_function_once ();
5052 init_stor_layout_once ();
5053 init_varasm_once ();
5054 init_EXPR_INSN_LIST_cache ();
5056 /* The following initialization functions need to generate rtl, so
5057 provide a dummy function context for them. */
5058 init_dummy_function_start ();
5060 if (flag_caller_saves)
5061 init_caller_save ();
5062 expand_dummy_function_end ();
5065 /* Language-dependent initialization. Returns non-zero on success. */
5067 lang_dependent_init (name)
5070 if (dump_base_name == 0)
5071 dump_base_name = name ? name : "gccdump";
5073 /* Front-end initialization. This hook can assume that GC,
5074 identifier hashes etc. are set up, but debug initialization is
5075 not done yet. This routine must return the original filename
5076 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5077 name = (*lang_hooks.init) (name);
5081 /* Is this duplication necessary? */
5082 name = ggc_strdup (name);
5083 main_input_filename = input_filename = name;
5084 init_asm_output (name);
5086 /* These create various _DECL nodes, so need to be called after the
5087 front end is initialized. */
5092 /* Put an entry on the input file stack for the main input file. */
5093 push_srcloc (input_filename, 0);
5095 /* If dbx symbol table desired, initialize writing it and output the
5096 predefined types. */
5097 timevar_push (TV_SYMOUT);
5099 #ifdef DWARF2_UNWIND_INFO
5100 if (dwarf2out_do_frame ())
5101 dwarf2out_frame_init ();
5104 /* Now we have the correct original filename, we can initialize
5106 (*debug_hooks->init) (name);
5108 timevar_pop (TV_SYMOUT);
5113 /* Clean up: close opened files, etc. */
5118 /* Close the dump files. */
5119 if (flag_gen_aux_info)
5121 fclose (aux_info_file);
5123 unlink (aux_info_file_name);
5126 /* Close non-debugging input and output files. Take special care to note
5127 whether fclose returns an error, since the pages might still be on the
5128 buffer chain while the file is open. */
5132 if (ferror (asm_out_file) != 0)
5133 fatal_io_error ("error writing to %s", asm_file_name);
5134 if (fclose (asm_out_file) != 0)
5135 fatal_io_error ("error closing %s", asm_file_name);
5138 /* Do whatever is necessary to finish printing the graphs. */
5139 if (graph_dump_format != no_graph)
5143 for (i = 0; i < (int) DFI_MAX; ++i)
5144 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5149 sprintf (seq, DUMPFILE_FORMAT, i);
5150 suffix = concat (seq, dump_file[i].extension, NULL);
5151 finish_graph_dump_file (dump_base_name, suffix);
5158 ggc_print_statistics ();
5159 stringpool_statistics ();
5160 dump_tree_statistics ();
5163 /* Free up memory for the benefit of leak detectors. */
5166 /* Language-specific end of compilation actions. */
5167 (*lang_hooks.finish) ();
5170 /* Initialize the compiler, and compile the input file. */
5174 /* The bulk of command line switch processing. */
5177 /* We cannot start timing until after options are processed since that
5178 says if we run timers or not. */
5180 timevar_start (TV_TOTAL);
5182 /* Language-independent initialization. Also sets up GC, identifier
5184 lang_independent_init ();
5186 /* Language-dependent initialization. Returns true on success. */
5187 if (lang_dependent_init (filename))
5192 /* Stop timing and print the times. */
5193 timevar_stop (TV_TOTAL);
5194 timevar_print (stderr);
5197 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5198 Decode command args, then call compile_file.
5199 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5200 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5202 It is not safe to call this function more than once. */
5205 toplev_main (argc, argv)
5211 /* Initialization of GCC's environment, and diagnostics. */
5212 general_init (argv[0]);
5214 /* Parse the options and do minimal processing; basically just
5215 enough to default flags appropriately. */
5216 parse_options_and_default_flags (argc, argv);
5218 /* Exit early if we can (e.g. -help). */
5219 if (!errorcount && !exit_after_options)
5222 if (errorcount || sorrycount)
5223 return (FATAL_EXIT_CODE);
5225 return (SUCCESS_EXIT_CODE);