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 /* Length of line when printing switch values. */
132 /* Name of program invoked, sans directories. */
134 const char *progname;
136 /* Copy of arguments to toplev_main. */
140 /* Name of current original source file (what was input to cpp).
141 This comes from each #-command in the actual input. */
143 const char *input_filename;
145 /* Name of top-level original source file (what was input to cpp).
146 This comes from the #-command at the beginning of the actual input.
147 If there isn't any there, then this is the cc1 input file name. */
149 const char *main_input_filename;
151 /* Current line number in real source file. */
155 /* Nonzero if it is unsafe to create any new pseudo registers. */
158 /* Stack of currently pending input files. */
160 struct file_stack *input_file_stack;
162 /* Incremented on each change to input_file_stack. */
163 int input_file_stack_tick;
165 /* Name to use as base of names for dump output files. */
167 const char *dump_base_name;
169 /* Format to use to print dumpfile index value */
170 #ifndef DUMPFILE_FORMAT
171 #define DUMPFILE_FORMAT ".%02d."
174 /* Bit flags that specify the machine subtype we are compiling for.
175 Bits are tested using macros TARGET_... defined in the tm.h file
176 and set by `-m...' switches. Must be defined in rtlanal.c. */
178 extern int target_flags;
180 /* Debug hooks - dependent upon command line options. */
182 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
184 /* Describes a dump file. */
186 struct dump_file_info
188 /* The unique extension to apply, e.g. ".jump". */
189 const char *const extension;
191 /* The -d<c> character that enables this dump file. */
192 char const debug_switch;
194 /* True if there is a corresponding graph dump file. */
195 char const graph_dump_p;
197 /* True if the user selected this dump. */
200 /* True if the files have been initialized (ie truncated). */
204 /* Enumerate the extant dump files. */
244 /* Describes all the dump files. Should be kept in order of the
245 pass and in sync with dump_file_index above.
247 Remaining -d letters:
253 static struct dump_file_info dump_file[DFI_MAX] =
255 { "rtl", 'r', 0, 0, 0 },
256 { "sibling", 'i', 0, 0, 0 },
257 { "eh", 'h', 0, 0, 0 },
258 { "jump", 'j', 0, 0, 0 },
259 { "ssa", 'e', 1, 0, 0 },
260 { "ssaccp", 'W', 1, 0, 0 },
261 { "ssadce", 'X', 1, 0, 0 },
262 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
263 { "null", 'u', 0, 0, 0 },
264 { "cse", 's', 0, 0, 0 },
265 { "addressof", 'F', 0, 0, 0 },
266 { "gcse", 'G', 1, 0, 0 },
267 { "loop", 'L', 1, 0, 0 },
268 { "cfg", 'f', 1, 0, 0 },
269 { "bp", 'b', 1, 0, 0 },
270 { "cse2", 't', 1, 0, 0 },
271 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
272 { "combine", 'c', 1, 0, 0 },
273 { "ce", 'C', 1, 0, 0 },
274 { "regmove", 'N', 1, 0, 0 },
275 { "sched", 'S', 1, 0, 0 },
276 { "lreg", 'l', 1, 0, 0 },
277 { "greg", 'g', 1, 0, 0 },
278 { "postreload", 'o', 1, 0, 0 },
279 { "flow2", 'w', 1, 0, 0 },
280 { "peephole2", 'z', 1, 0, 0 },
281 { "rnreg", 'n', 1, 0, 0 },
282 { "ce2", 'E', 1, 0, 0 },
283 { "sched2", 'R', 1, 0, 0 },
284 { "stack", 'k', 1, 0, 0 },
285 { "bbro", 'B', 1, 0, 0 },
286 { "mach", 'M', 1, 0, 0 },
287 { "dbr", 'd', 0, 0, 0 },
290 static int open_dump_file PARAMS ((enum dump_file_index, tree));
291 static void close_dump_file PARAMS ((enum dump_file_index,
292 void (*) (FILE *, rtx), rtx));
294 /* Other flags saying which kinds of debugging dump have been requested. */
296 int rtl_dump_and_exit;
297 int flag_print_asm_name;
298 static int version_flag;
299 static char *filename;
300 enum graph_dump_types graph_dump_format;
302 /* Name for output file of assembly code, specified with -o. */
306 /* Value of the -G xx switch, and whether it was passed or not. */
310 /* Type(s) of debugging information we are producing (if any).
311 See flags.h for the definitions of the different possible
312 types of debugging information. */
313 enum debug_info_type write_symbols = NO_DEBUG;
315 /* Level of debugging information we are producing. See flags.h
316 for the definitions of the different possible levels. */
317 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
319 /* Nonzero means use GNU-only extensions in the generated symbolic
320 debugging information. */
321 /* Currently, this only has an effect when write_symbols is set to
322 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
323 int use_gnu_debug_info_extensions = 0;
325 /* Nonzero means do optimizations. -O.
326 Particular numeric values stand for particular amounts of optimization;
327 thus, -O2 stores 2 here. However, the optimizations beyond the basic
328 ones are not controlled directly by this variable. Instead, they are
329 controlled by individual `flag_...' variables that are defaulted
330 based on this variable. */
334 /* Nonzero means optimize for size. -Os.
335 The only valid values are zero and non-zero. When optimize_size is
336 non-zero, optimize defaults to 2, but certain individual code
337 bloating optimizations are disabled. */
339 int optimize_size = 0;
341 /* Nonzero if we should exit after parsing options. */
342 static int exit_after_options = 0;
344 /* The FUNCTION_DECL for the function currently being compiled,
345 or 0 if between functions. */
346 tree current_function_decl;
348 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
350 tree current_function_func_begin_label;
352 /* Pointer to function to compute rtl for a language-specific tree code. */
354 typedef rtx (*lang_expand_expr_t)
355 PARAMS ((union tree_node *, rtx, enum machine_mode,
356 enum expand_modifier modifier));
358 lang_expand_expr_t lang_expand_expr = 0;
360 /* Pointer to function to finish handling an incomplete decl at the
361 end of compilation. */
363 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
365 /* Nonzero if doing dwarf2 duplicate elimination. */
367 int flag_eliminate_dwarf2_dups = 0;
369 /* Nonzero if generating code to do profiling. */
371 int profile_flag = 0;
373 /* Nonzero if generating code to profile program flow graph arcs. */
375 int profile_arc_flag = 0;
377 /* Nonzero if generating info for gcov to calculate line test coverage. */
379 int flag_test_coverage = 0;
381 /* Nonzero indicates that branch taken probabilities should be calculated. */
383 int flag_branch_probabilities = 0;
385 /* Nonzero if basic blocks should be reordered. */
387 int flag_reorder_blocks = 0;
389 /* Nonzero if registers should be renamed. */
391 int flag_rename_registers = 0;
392 int flag_cprop_registers = 0;
394 /* Nonzero for -pedantic switch: warn about anything
395 that standard spec forbids. */
399 /* Temporarily suppress certain warnings.
400 This is set while reading code from a system header file. */
402 int in_system_header = 0;
404 /* Don't print functions as they are compiled. -quiet. */
408 /* Print times taken by the various passes. -ftime-report. */
412 /* Print memory still in use at end of compilation (which may have little
413 to do with peak memory consumption). -fmem-report. */
417 /* Non-zero means to collect statistics which might be expensive
418 and to print them when we are done. */
419 int flag_detailed_statistics = 0;
424 /* Nonzero means `char' should be signed. */
426 int flag_signed_char;
428 /* Nonzero means give an enum type only as many bytes as it needs. */
430 int flag_short_enums;
432 /* Nonzero for -fcaller-saves: allocate values in regs that need to
433 be saved across function calls, if that produces overall better code.
434 Optional now, so people can test it. */
436 #ifdef DEFAULT_CALLER_SAVES
437 int flag_caller_saves = 1;
439 int flag_caller_saves = 0;
442 /* Nonzero if structures and unions should be returned in memory.
444 This should only be defined if compatibility with another compiler or
445 with an ABI is needed, because it results in slower code. */
447 #ifndef DEFAULT_PCC_STRUCT_RETURN
448 #define DEFAULT_PCC_STRUCT_RETURN 1
451 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
453 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
455 /* Nonzero for -fforce-mem: load memory value into a register
456 before arithmetic on it. This makes better cse but slower compilation. */
458 int flag_force_mem = 0;
460 /* Nonzero for -fforce-addr: load memory address into a register before
461 reference to memory. This makes better cse but slower compilation. */
463 int flag_force_addr = 0;
465 /* Nonzero for -fdefer-pop: don't pop args after each function call;
466 instead save them up to pop many calls' args with one insns. */
468 int flag_defer_pop = 0;
470 /* Nonzero for -ffloat-store: don't allocate floats and doubles
471 in extended-precision registers. */
473 int flag_float_store = 0;
475 /* Nonzero for -fcse-follow-jumps:
476 have cse follow jumps to do a more extensive job. */
478 int flag_cse_follow_jumps;
480 /* Nonzero for -fcse-skip-blocks:
481 have cse follow a branch around a block. */
482 int flag_cse_skip_blocks;
484 /* Nonzero for -fexpensive-optimizations:
485 perform miscellaneous relatively-expensive optimizations. */
486 int flag_expensive_optimizations;
488 /* Nonzero for -fthread-jumps:
489 have jump optimize output of loop. */
491 int flag_thread_jumps;
493 /* Nonzero enables strength-reduction in loop.c. */
495 int flag_strength_reduce = 0;
497 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
498 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
499 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
502 int flag_unroll_loops;
504 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
505 This is generally not a win. */
507 int flag_unroll_all_loops;
509 /* Nonzero enables prefetch optimizations for arrays in loops. */
511 int flag_prefetch_loop_arrays;
513 /* Nonzero forces all invariant computations in loops to be moved
516 int flag_move_all_movables = 0;
518 /* Nonzero forces all general induction variables in loops to be
521 int flag_reduce_all_givs = 0;
523 /* Nonzero to perform full register move optimization passes. This is the
526 int flag_regmove = 0;
528 /* Nonzero for -fwritable-strings:
529 store string constants in data segment and don't uniquize them. */
531 int flag_writable_strings = 0;
533 /* Nonzero means don't put addresses of constant functions in registers.
534 Used for compiling the Unix kernel, where strange substitutions are
535 done on the assembly output. */
537 int flag_no_function_cse = 0;
539 /* Nonzero for -fomit-frame-pointer:
540 don't make a frame pointer in simple functions that don't require one. */
542 int flag_omit_frame_pointer = 0;
544 /* Nonzero means place each function into its own section on those platforms
545 which support arbitrary section names and unlimited numbers of sections. */
547 int flag_function_sections = 0;
549 /* ... and similar for data. */
551 int flag_data_sections = 0;
553 /* Nonzero to inhibit use of define_optimization peephole opts. */
555 int flag_no_peephole = 0;
557 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
559 int flag_optimize_sibling_calls = 0;
561 /* Nonzero means the front end generally wants `errno' maintained by math
562 operations, like built-in SQRT. */
564 int flag_errno_math = 1;
566 /* Nonzero means that unsafe floating-point math optimizations are allowed
567 for the sake of speed. IEEE compliance is not guaranteed, and operations
568 are allowed to assume that their arguments and results are "normal"
569 (e.g., nonnegative for SQRT). */
571 int flag_unsafe_math_optimizations = 0;
573 /* Zero means that floating-point math operations cannot generate a
574 (user-visible) trap. This is the case, for example, in nonstop
575 IEEE 754 arithmetic. */
577 int flag_trapping_math = 1;
579 /* 0 means straightforward implementation of complex divide acceptable.
580 1 means wide ranges of inputs must work for complex divide.
581 2 means C99-like requirements for complex divide (not yet implemented). */
583 int flag_complex_divide_method = 0;
585 /* Nonzero means all references through pointers are volatile. */
589 /* Nonzero means treat all global and extern variables as volatile. */
591 int flag_volatile_global;
593 /* Nonzero means treat all static variables as volatile. */
595 int flag_volatile_static;
597 /* Nonzero means just do syntax checking; don't output anything. */
599 int flag_syntax_only = 0;
601 /* Nonzero means perform global cse. */
603 static int flag_gcse;
605 /* Nonzero means perform loop optimizer. */
607 static int flag_loop_optimize;
609 /* Nonzero means perform crossjumping. */
611 static int flag_crossjumping;
613 /* Nonzero means to use global dataflow analysis to eliminate
614 useless null pointer tests. */
616 static int flag_delete_null_pointer_checks;
618 /* Nonzero means to do the enhanced load motion during gcse, which trys
619 to hoist loads by not killing them when a store to the same location
622 int flag_gcse_lm = 1;
624 /* Nonzero means to perform store motion after gcse, which will try to
625 move stores closer to the exit block. Its not very effective without
628 int flag_gcse_sm = 1;
630 /* Nonzero means to rerun cse after loop optimization. This increases
631 compilation time about 20% and picks up a few more common expressions. */
633 static int flag_rerun_cse_after_loop;
635 /* Nonzero means to run loop optimizations twice. */
637 int flag_rerun_loop_opt;
639 /* Nonzero for -finline-functions: ok to inline functions that look like
640 good inline candidates. */
642 int flag_inline_functions;
644 /* Nonzero for -fkeep-inline-functions: even if we make a function
645 go inline everywhere, keep its definition around for debugging
648 int flag_keep_inline_functions;
650 /* Nonzero means that functions will not be inlined. */
654 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
655 not just because the tree inliner turned us off. */
657 int flag_really_no_inline;
659 /* Nonzero means that we should emit static const variables
660 regardless of whether or not optimization is turned on. */
662 int flag_keep_static_consts = 1;
664 /* Nonzero means we should be saving declaration info into a .X file. */
666 int flag_gen_aux_info = 0;
668 /* Specified name of aux-info file. */
670 static char *aux_info_file_name;
672 /* Nonzero means make the text shared if supported. */
674 int flag_shared_data;
676 /* Nonzero means schedule into delayed branch slots if supported. */
678 int flag_delayed_branch;
680 /* Nonzero if we are compiling pure (sharable) code.
681 Value is 1 if we are doing reasonable (i.e. simple
682 offset into offset table) pic. Value is 2 if we can
683 only perform register offsets. */
687 /* Nonzero means generate extra code for exception handling and enable
688 exception handling. */
692 /* Nonzero means generate frame unwind info table when supported. */
694 int flag_unwind_tables = 0;
696 /* Nonzero means generate frame unwind info table exact at each insn boundary */
698 int flag_asynchronous_unwind_tables = 0;
700 /* Nonzero means don't place uninitialized global data in common storage
705 /* Nonzero means change certain warnings into errors.
706 Usually these are warnings about failure to conform to some standard. */
708 int flag_pedantic_errors = 0;
710 /* flag_schedule_insns means schedule insns within basic blocks (before
712 flag_schedule_insns_after_reload means schedule insns after
715 int flag_schedule_insns = 0;
716 int flag_schedule_insns_after_reload = 0;
718 /* The following flags have effect only for scheduling before register
721 flag_schedule_interblock means schedule insns accross basic blocks.
722 flag_schedule_speculative means allow speculative motion of non-load insns.
723 flag_schedule_speculative_load means allow speculative motion of some
725 flag_schedule_speculative_load_dangerous allows speculative motion of more
728 int flag_schedule_interblock = 1;
729 int flag_schedule_speculative = 1;
730 int flag_schedule_speculative_load = 0;
731 int flag_schedule_speculative_load_dangerous = 0;
733 int flag_single_precision_constant;
735 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
736 by a cheaper branch on a count register. */
737 int flag_branch_on_count_reg = 1;
739 /* -finhibit-size-directive inhibits output of .size for ELF.
740 This is used only for compiling crtstuff.c,
741 and it may be extended to other effects
742 needed for crtstuff.c on other systems. */
743 int flag_inhibit_size_directive = 0;
745 /* -fverbose-asm causes extra commentary information to be produced in
746 the generated assembly code (to make it more readable). This option
747 is generally only of use to those who actually need to read the
748 generated assembly code (perhaps while debugging the compiler itself).
749 -fno-verbose-asm, the default, causes the extra information
750 to be omitted and is useful when comparing two assembler files. */
752 int flag_verbose_asm = 0;
754 /* -dA causes debug commentary information to be produced in
755 the generated assembly code (to make it more readable). This option
756 is generally only of use to those who actually need to read the
757 generated assembly code (perhaps while debugging the compiler itself).
758 Currently, this switch is only used by dwarfout.c; however, it is intended
759 to be a catchall for printing debug information in the assembler file. */
761 int flag_debug_asm = 0;
763 /* -dP causes the rtl to be emitted as a comment in assembly. */
765 int flag_dump_rtl_in_asm = 0;
767 /* -fgnu-linker specifies use of the GNU linker for initializations.
768 (Or, more generally, a linker that handles initializations.)
769 -fno-gnu-linker says that collect2 will be used. */
771 int flag_gnu_linker = 0;
773 int flag_gnu_linker = 1;
776 /* Nonzero means put zero initialized data in the bss section. */
777 int flag_zero_initialized_in_bss = 1;
782 /* Enable ssa conditional constant propagation. */
783 int flag_ssa_ccp = 0;
785 /* Enable ssa aggressive dead code elimination. */
786 int flag_ssa_dce = 0;
788 /* Tag all structures with __attribute__(packed). */
789 int flag_pack_struct = 0;
791 /* Emit code to check for stack overflow; also may cause large objects
792 to be allocated dynamically. */
793 int flag_stack_check;
795 /* When non-NULL, indicates that whenever space is allocated on the
796 stack, the resulting stack pointer must not pass this
797 address---that is, for stacks that grow downward, the stack pointer
798 must always be greater than or equal to this address; for stacks
799 that grow upward, the stack pointer must be less than this address.
800 At present, the rtx may be either a REG or a SYMBOL_REF, although
801 the support provided depends on the backend. */
804 /* 0 if pointer arguments may alias each other. True in C.
805 1 if pointer arguments may not alias each other but may alias
807 2 if pointer arguments may not alias each other and may not
808 alias global variables. True in Fortran.
809 This defaults to 0 for C. */
810 int flag_argument_noalias = 0;
812 /* Nonzero if we should do (language-dependent) alias analysis.
813 Typically, this analysis will assume that expressions of certain
814 types do not alias expressions of certain other types. Only used
815 if alias analysis (in general) is enabled. */
816 int flag_strict_aliasing = 0;
818 /* Instrument functions with calls at entry and exit, for profiling. */
819 int flag_instrument_function_entry_exit = 0;
821 /* Nonzero means ignore `#ident' directives. 0 means handle them.
822 On SVR4 targets, it also controls whether or not to emit a
823 string identifying the compiler. */
825 int flag_no_ident = 0;
827 /* This will perform a peephole pass before sched2. */
828 int flag_peephole2 = 0;
830 /* This will try to guess branch probabilities. */
831 int flag_guess_branch_prob = 0;
833 /* -fbounded-pointers causes gcc to compile pointers as composite
834 objects occupying three words: the pointer value, the base address
835 of the referent object, and the address immediately beyond the end
836 of the referent object. The base and extent allow us to perform
837 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
838 int flag_bounded_pointers = 0;
840 /* -fcheck-bounds causes gcc to generate array bounds checks.
841 For C, C++: defaults to value of flag_bounded_pointers.
842 For ObjC: defaults to off.
843 For Java: defaults to on.
844 For Fortran: defaults to off.
845 For CHILL: defaults to off. */
846 int flag_bounds_check = 0;
848 /* This will attempt to merge constant section constants, if 1 only
849 string constants and constants from constant pool, if 2 also constant
851 int flag_merge_constants = 1;
853 /* If one, renumber instruction UIDs to reduce the number of
854 unused UIDs if there are a lot of instructions. If greater than
855 one, unconditionally renumber instruction UIDs. */
856 int flag_renumber_insns = 1;
858 /* Values of the -falign-* flags: how much to align labels in code.
859 0 means `use default', 1 means `don't align'.
860 For each variable, there is an _log variant which is the power
861 of two not less than the variable, for .align output. */
865 int align_loops_max_skip;
868 int align_jumps_max_skip;
870 int align_labels_log;
871 int align_labels_max_skip;
873 int align_functions_log;
875 /* Table of supported debugging formats. */
878 const char *const arg;
879 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
880 constant expression, we use NO_DEBUG in its place. */
881 const enum debug_info_type debug_type;
882 const int use_extensions_p;
883 const char *const description;
887 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
888 N_("Generate debugging info in default format") },
889 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
890 #ifdef DBX_DEBUGGING_INFO
891 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
892 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
894 #ifdef DWARF_DEBUGGING_INFO
895 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
896 { "dwarf+", DWARF_DEBUG, 1,
897 N_("Generate extended DWARF-1 format debug info") },
899 #ifdef DWARF2_DEBUGGING_INFO
900 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
902 #ifdef XCOFF_DEBUGGING_INFO
903 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
904 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
906 #ifdef SDB_DEBUGGING_INFO
907 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
909 #ifdef VMS_DEBUGGING_INFO
910 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
917 const char *const string;
920 const char *const description;
922 lang_independent_options;
926 /* Add or remove a leading underscore from user symbols. */
927 int flag_leading_underscore = -1;
929 /* The user symbol prefix after having resolved same. */
930 const char *user_label_prefix;
932 static const param_info lang_independent_params[] = {
933 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
934 { OPTION, DEFAULT, HELP },
935 #include "params.def"
940 /* A default for same. */
941 #ifndef USER_LABEL_PREFIX
942 #define USER_LABEL_PREFIX ""
945 /* Table of language-independent -f options.
946 STRING is the option name. VARIABLE is the address of the variable.
947 ON_VALUE is the value to store in VARIABLE
948 if `-fSTRING' is seen as an option.
949 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
951 static const lang_independent_options f_options[] =
953 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
954 N_("Perform DWARF2 duplicate elimination") },
955 {"float-store", &flag_float_store, 1,
956 N_("Do not store floats in registers") },
957 {"volatile", &flag_volatile, 1,
958 N_("Consider all mem refs through pointers as volatile") },
959 {"volatile-global", &flag_volatile_global, 1,
960 N_("Consider all mem refs to global data to be volatile") },
961 {"volatile-static", &flag_volatile_static, 1,
962 N_("Consider all mem refs to static data to be volatile") },
963 {"defer-pop", &flag_defer_pop, 1,
964 N_("Defer popping functions args from stack until later") },
965 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
966 N_("When possible do not generate stack frames") },
967 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
968 N_("Optimize sibling and tail recursive calls") },
969 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
970 N_("When running CSE, follow jumps to their targets") },
971 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
972 N_("When running CSE, follow conditional jumps") },
973 {"expensive-optimizations", &flag_expensive_optimizations, 1,
974 N_("Perform a number of minor, expensive optimizations") },
975 {"thread-jumps", &flag_thread_jumps, 1,
976 N_("Perform jump threading optimizations") },
977 {"strength-reduce", &flag_strength_reduce, 1,
978 N_("Perform strength reduction optimizations") },
979 {"unroll-loops", &flag_unroll_loops, 1,
980 N_("Perform loop unrolling when iteration count is known") },
981 {"unroll-all-loops", &flag_unroll_all_loops, 1,
982 N_("Perform loop unrolling for all loops") },
983 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
984 N_("Generate prefetch instructions, if available, for arrays in loops") },
985 {"move-all-movables", &flag_move_all_movables, 1,
986 N_("Force all loop invariant computations out of loops") },
987 {"reduce-all-givs", &flag_reduce_all_givs, 1,
988 N_("Strength reduce all loop general induction variables") },
989 {"writable-strings", &flag_writable_strings, 1,
990 N_("Store strings in writable data section") },
991 {"peephole", &flag_no_peephole, 0,
992 N_("Enable machine specific peephole optimizations") },
993 {"force-mem", &flag_force_mem, 1,
994 N_("Copy memory operands into registers before using") },
995 {"force-addr", &flag_force_addr, 1,
996 N_("Copy memory address constants into regs before using") },
997 {"function-cse", &flag_no_function_cse, 0,
998 N_("Allow function addresses to be held in registers") },
999 {"inline-functions", &flag_inline_functions, 1,
1000 N_("Integrate simple functions into their callers") },
1001 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1002 N_("Generate code for funcs even if they are fully inlined") },
1003 {"inline", &flag_no_inline, 0,
1004 N_("Pay attention to the 'inline' keyword") },
1005 {"keep-static-consts", &flag_keep_static_consts, 1,
1006 N_("Emit static const variables even if they are not used") },
1007 {"syntax-only", &flag_syntax_only, 1,
1008 N_("Check for syntax errors, then stop") },
1009 {"shared-data", &flag_shared_data, 1,
1010 N_("Mark data as shared rather than private") },
1011 {"caller-saves", &flag_caller_saves, 1,
1012 N_("Enable saving registers around function calls") },
1013 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1014 N_("Return 'short' aggregates in memory, not registers") },
1015 {"reg-struct-return", &flag_pcc_struct_return, 0,
1016 N_("Return 'short' aggregates in registers") },
1017 {"delayed-branch", &flag_delayed_branch, 1,
1018 N_("Attempt to fill delay slots of branch instructions") },
1019 {"gcse", &flag_gcse, 1,
1020 N_("Perform the global common subexpression elimination") },
1021 {"gcse-lm", &flag_gcse_lm, 1,
1022 N_("Perform enhanced load motion during global subexpression elimination") },
1023 {"gcse-sm", &flag_gcse_sm, 1,
1024 N_("Perform store motion after global subexpression elimination") },
1025 {"loop-optimize", &flag_loop_optimize, 1,
1026 N_("Perform the loop optimizations") },
1027 {"crossjumping", &flag_crossjumping, 1,
1028 N_("Perform cross-jumping optimization") },
1029 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1030 N_("Run CSE pass after loop optimizations") },
1031 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1032 N_("Run the loop optimizer twice") },
1033 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1034 N_("Delete useless null pointer checks") },
1035 {"schedule-insns", &flag_schedule_insns, 1,
1036 N_("Reschedule instructions before register allocation") },
1037 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1038 N_("Reschedule instructions after register allocation") },
1039 {"sched-interblock",&flag_schedule_interblock, 1,
1040 N_("Enable scheduling across basic blocks") },
1041 {"sched-spec",&flag_schedule_speculative, 1,
1042 N_("Allow speculative motion of non-loads") },
1043 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1044 N_("Allow speculative motion of some loads") },
1045 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1046 N_("Allow speculative motion of more loads") },
1047 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1048 N_("Replace add,compare,branch with branch on count reg") },
1049 {"pic", &flag_pic, 1,
1050 N_("Generate position independent code, if possible") },
1051 {"PIC", &flag_pic, 2, ""},
1052 {"exceptions", &flag_exceptions, 1,
1053 N_("Enable exception handling") },
1054 {"unwind-tables", &flag_unwind_tables, 1,
1055 N_("Just generate unwind tables for exception handling") },
1056 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1057 N_("Generate unwind tables exact at each instruction boundary") },
1058 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1059 N_("Support synchronous non-call exceptions") },
1060 {"profile-arcs", &profile_arc_flag, 1,
1061 N_("Insert arc based program profiling code") },
1062 {"test-coverage", &flag_test_coverage, 1,
1063 N_("Create data files needed by gcov") },
1064 {"branch-probabilities", &flag_branch_probabilities, 1,
1065 N_("Use profiling information for branch probabilities") },
1066 {"reorder-blocks", &flag_reorder_blocks, 1,
1067 N_("Reorder basic blocks to improve code placement") },
1068 {"rename-registers", &flag_rename_registers, 1,
1069 N_("Do the register renaming optimization pass") },
1070 {"cprop-registers", &flag_cprop_registers, 1,
1071 N_("Do the register copy-propagation optimization pass") },
1072 {"common", &flag_no_common, 0,
1073 N_("Do not put uninitialized globals in the common section") },
1074 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1075 N_("Do not generate .size directives") },
1076 {"function-sections", &flag_function_sections, 1,
1077 N_("place each function into its own section") },
1078 {"data-sections", &flag_data_sections, 1,
1079 N_("place data items into their own section") },
1080 {"verbose-asm", &flag_verbose_asm, 1,
1081 N_("Add extra commentry to assembler output") },
1082 {"gnu-linker", &flag_gnu_linker, 1,
1083 N_("Output GNU ld formatted global initializers") },
1084 {"regmove", &flag_regmove, 1,
1085 N_("Enables a register move optimization") },
1086 {"optimize-register-move", &flag_regmove, 1,
1087 N_("Do the full regmove optimization pass") },
1088 {"pack-struct", &flag_pack_struct, 1,
1089 N_("Pack structure members together without holes") },
1090 {"stack-check", &flag_stack_check, 1,
1091 N_("Insert stack checking code into the program") },
1092 {"argument-alias", &flag_argument_noalias, 0,
1093 N_("Specify that arguments may alias each other & globals") },
1094 {"argument-noalias", &flag_argument_noalias, 1,
1095 N_("Assume arguments may alias globals but not each other") },
1096 {"argument-noalias-global", &flag_argument_noalias, 2,
1097 N_("Assume arguments do not alias each other or globals") },
1098 {"strict-aliasing", &flag_strict_aliasing, 1,
1099 N_("Assume strict aliasing rules apply") },
1100 {"align-loops", &align_loops, 0,
1101 N_("Align the start of loops") },
1102 {"align-jumps", &align_jumps, 0,
1103 N_("Align labels which are only reached by jumping") },
1104 {"align-labels", &align_labels, 0,
1105 N_("Align all labels") },
1106 {"align-functions", &align_functions, 0,
1107 N_("Align the start of functions") },
1108 {"merge-constants", &flag_merge_constants, 1,
1109 N_("Attempt to merge identical constants accross compilation units") },
1110 {"merge-all-constants", &flag_merge_constants, 2,
1111 N_("Attempt to merge identical constants and constant variables") },
1112 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1113 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1114 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1115 N_("Instrument function entry/exit with profiling calls") },
1116 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1117 N_("Put zero initialized data in the bss section") },
1118 {"ssa", &flag_ssa, 1,
1119 N_("Enable SSA optimizations") },
1120 {"ssa-ccp", &flag_ssa_ccp, 1,
1121 N_("Enable SSA conditional constant propagation") },
1122 {"ssa-dce", &flag_ssa_dce, 1,
1123 N_("Enable aggressive SSA dead code elimination") },
1124 {"leading-underscore", &flag_leading_underscore, 1,
1125 N_("External symbols have a leading underscore") },
1126 {"ident", &flag_no_ident, 0,
1127 N_("Process #ident directives") },
1128 { "peephole2", &flag_peephole2, 1,
1129 N_("Enables an rtl peephole pass run before sched2") },
1130 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1131 N_("Enables guessing of branch probabilities") },
1132 {"math-errno", &flag_errno_math, 1,
1133 N_("Set errno after built-in math functions") },
1134 {"trapping-math", &flag_trapping_math, 1,
1135 N_("Floating-point operations can trap") },
1136 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1137 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1138 {"bounded-pointers", &flag_bounded_pointers, 1,
1139 N_("Compile pointers as triples: value, base & end") },
1140 {"bounds-check", &flag_bounds_check, 1,
1141 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1142 {"single-precision-constant", &flag_single_precision_constant, 1,
1143 N_("Convert floating point constant to single precision constant") },
1144 {"time-report", &time_report, 1,
1145 N_("Report time taken by each compiler pass at end of run") },
1146 {"mem-report", &mem_report, 1,
1147 N_("Report on permanent memory allocation at end of run") },
1148 { "trapv", &flag_trapv, 1,
1149 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1152 /* Table of language-specific options. */
1154 static const struct lang_opt
1156 const char *const option;
1157 const char *const description;
1159 documented_lang_options[] =
1161 /* In order not to overload the --help output, the convention
1162 used here is to only describe those options which are not
1163 enabled by default. */
1166 N_("Compile just for ISO C89") },
1168 N_("Determine language standard") },
1170 { "-fsigned-bitfields", "" },
1171 { "-funsigned-bitfields",
1172 N_("Make bit-fields by unsigned by default") },
1173 { "-fno-signed-bitfields", "" },
1174 { "-fno-unsigned-bitfields","" },
1176 N_("Make 'char' be signed by default") },
1177 { "-funsigned-char",
1178 N_("Make 'char' be unsigned by default") },
1179 { "-fno-signed-char", "" },
1180 { "-fno-unsigned-char", "" },
1184 N_("Do not recognize the 'asm' keyword") },
1185 { "-fbuiltin", "" },
1187 N_("Do not recognize any built in functions") },
1189 N_("Assume normal C execution environment") },
1190 { "-fno-hosted", "" },
1192 N_("Assume that standard libraries & main might not exist") },
1193 { "-fno-freestanding", "" },
1194 { "-fcond-mismatch",
1195 N_("Allow different types as args of ? operator") },
1196 { "-fno-cond-mismatch", "" },
1197 { "-fdollars-in-identifiers",
1198 N_("Allow the use of $ inside identifiers") },
1199 { "-fno-dollars-in-identifiers", "" },
1200 { "-fpreprocessed", "" },
1201 { "-fno-preprocessed", "" },
1203 N_("Use the same size for double as for float") },
1204 { "-fno-short-double", "" },
1206 N_("Use the smallest fitting integer to hold enums") },
1207 { "-fno-short-enums", "" },
1209 N_("Override the underlying type for wchar_t to `unsigned short'") },
1210 { "-fno-short-wchar", "" },
1213 N_("Enable most warning messages") },
1214 { "-Wbad-function-cast",
1215 N_("Warn about casting functions to incompatible types") },
1216 { "-Wno-bad-function-cast", "" },
1217 { "-Wmissing-format-attribute",
1218 N_("Warn about functions which might be candidates for format attributes") },
1219 { "-Wno-missing-format-attribute", "" },
1221 N_("Warn about casts which discard qualifiers") },
1222 { "-Wno-cast-qual", "" },
1223 { "-Wchar-subscripts",
1224 N_("Warn about subscripts whose type is 'char'") },
1225 { "-Wno-char-subscripts", "" },
1227 N_("Warn if nested comments are detected") },
1228 { "-Wno-comment", "" },
1230 N_("Warn if nested comments are detected") },
1231 { "-Wno-comments", "" },
1233 N_("Warn about possibly confusing type conversions") },
1234 { "-Wno-conversion", "" },
1235 { "-Wdiv-by-zero", "" },
1236 { "-Wno-div-by-zero",
1237 N_("Do not warn about compile-time integer division by zero") },
1239 N_("Warn about testing equality of floating point numbers") },
1240 { "-Wno-float-equal", "" },
1242 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1243 { "-Wno-format", "" },
1244 { "-Wformat-extra-args", "" },
1245 { "-Wno-format-extra-args",
1246 N_("Don't warn about too many arguments to format functions") },
1247 { "-Wformat-nonliteral",
1248 N_("Warn about non-string-literal format strings") },
1249 { "-Wno-format-nonliteral", "" },
1250 { "-Wformat-security",
1251 N_("Warn about possible security problems with format functions") },
1252 { "-Wno-format-security", "" },
1253 { "-Wformat-y2k", "" },
1254 { "-Wno-format-y2k",
1255 N_("Don't warn about strftime formats yielding 2 digit years") },
1256 { "-Wimplicit-function-declaration",
1257 N_("Warn about implicit function declarations") },
1258 { "-Wno-implicit-function-declaration", "" },
1259 { "-Werror-implicit-function-declaration", "" },
1261 N_("Warn when a declaration does not specify a type") },
1262 { "-Wno-implicit-int", "" },
1263 { "-Wimplicit", "" },
1264 { "-Wno-implicit", "" },
1266 N_("Warn about the use of the #import directive") },
1267 { "-Wno-import", "" },
1268 { "-Wlong-long","" },
1270 N_("Do not warn about using 'long long' when -pedantic") },
1272 N_("Warn about suspicious declarations of main") },
1273 { "-Wno-main", "" },
1274 { "-Wmissing-braces",
1275 N_("Warn about possibly missing braces around initializers") },
1276 { "-Wno-missing-braces", "" },
1277 { "-Wmissing-declarations",
1278 N_("Warn about global funcs without previous declarations") },
1279 { "-Wno-missing-declarations", "" },
1280 { "-Wmissing-prototypes",
1281 N_("Warn about global funcs without prototypes") },
1282 { "-Wno-missing-prototypes", "" },
1284 N_("Warn about use of multicharacter literals") },
1285 { "-Wno-multichar", "" },
1286 { "-Wnested-externs",
1287 N_("Warn about externs not at file scope level") },
1288 { "-Wno-nested-externs", "" },
1290 N_("Warn about possible missing parentheses") },
1291 { "-Wno-parentheses", "" },
1292 { "-Wpointer-arith",
1293 N_("Warn about function pointer arithmetic") },
1294 { "-Wno-pointer-arith", "" },
1295 { "-Wredundant-decls",
1296 N_("Warn about multiple declarations of the same object") },
1297 { "-Wno-redundant-decls", "" },
1299 N_("Warn whenever a function's return-type defaults to int") },
1300 { "-Wno-return-type", "" },
1301 { "-Wsequence-point",
1302 N_("Warn about possible violations of sequence point rules") },
1303 { "-Wno-sequence-point", "" },
1305 N_("Warn about signed/unsigned comparisons") },
1306 { "-Wno-sign-compare", "" },
1307 { "-Wstrict-prototypes",
1308 N_("Warn about non-prototyped function decls") },
1309 { "-Wno-strict-prototypes", "" },
1311 N_("Warn about constructs whose meanings change in ISO C") },
1312 { "-Wno-traditional", "" },
1314 N_("Warn when trigraphs are encountered") },
1315 { "-Wno-trigraphs", "" },
1317 { "-Wno-undef", "" },
1318 { "-Wunknown-pragmas",
1319 N_("Warn about unrecognized pragmas") },
1320 { "-Wno-unknown-pragmas", "" },
1321 { "-Wwrite-strings",
1322 N_("Mark strings as 'const char *'") },
1323 { "-Wno-write-strings", "" },
1325 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1327 #include "options.h"
1331 /* Here is a table, controlled by the tm.h file, listing each -m switch
1332 and which bits in `target_switches' it should set or clear.
1333 If VALUE is positive, it is bits to set.
1334 If VALUE is negative, -VALUE is bits to clear.
1335 (The sign bit is not used so there is no confusion.) */
1339 const char *const name;
1341 const char *const description;
1343 target_switches [] = TARGET_SWITCHES;
1345 /* This table is similar, but allows the switch to have a value. */
1347 #ifdef TARGET_OPTIONS
1350 const char *const prefix;
1351 const char **const variable;
1352 const char *const description;
1354 target_options [] = TARGET_OPTIONS;
1357 /* Options controlling warnings. */
1359 /* Don't print warning messages. -w. */
1361 int inhibit_warnings = 0;
1363 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1365 int warn_system_headers = 0;
1367 /* Print various extra warnings. -W. */
1369 int extra_warnings = 0;
1371 /* Treat warnings as errors. -Werror. */
1373 int warnings_are_errors = 0;
1375 /* Nonzero to warn about unused variables, functions et.al. */
1377 int warn_unused_function;
1378 int warn_unused_label;
1379 int warn_unused_parameter;
1380 int warn_unused_variable;
1381 int warn_unused_value;
1383 /* Nonzero to warn about code which is never reached. */
1385 int warn_notreached;
1387 /* Nonzero to warn about variables used before they are initialized. */
1389 int warn_uninitialized;
1391 /* Nonzero means warn about all declarations which shadow others. */
1395 /* Warn if a switch on an enum, that does not have a default case,
1396 fails to have a case for every enum value. */
1400 /* Warn if a switch does not have a default case. */
1402 int warn_switch_default;
1404 /* Nonzero means warn about function definitions that default the return type
1405 or that use a null return and have a return-type other than void. */
1407 int warn_return_type;
1409 /* Nonzero means warn about pointer casts that increase the required
1410 alignment of the target type (and might therefore lead to a crash
1411 due to a misaligned access). */
1413 int warn_cast_align;
1415 /* Nonzero means warn about any objects definitions whose size is larger
1416 than N bytes. Also want about function definitions whose returned
1417 values are larger than N bytes. The value N is in `larger_than_size'. */
1419 int warn_larger_than;
1420 HOST_WIDE_INT larger_than_size;
1422 /* Nonzero means warn if inline function is too large. */
1426 /* Warn if a function returns an aggregate,
1427 since there are often incompatible calling conventions for doing this. */
1429 int warn_aggregate_return;
1431 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1435 /* Warn when gcc pads a structure to an alignment boundary. */
1439 /* Warn when an optimization pass is disabled. */
1441 int warn_disabled_optimization;
1443 /* Warn about functions which might be candidates for attribute noreturn. */
1445 int warn_missing_noreturn;
1447 /* Nonzero means warn about uses of __attribute__((deprecated))
1450 int warn_deprecated_decl = 1;
1452 /* Likewise for -W. */
1454 static const lang_independent_options W_options[] =
1456 {"unused-function", &warn_unused_function, 1,
1457 N_("Warn when a function is unused") },
1458 {"unused-label", &warn_unused_label, 1,
1459 N_("Warn when a label is unused") },
1460 {"unused-parameter", &warn_unused_parameter, 1,
1461 N_("Warn when a function parameter is unused") },
1462 {"unused-variable", &warn_unused_variable, 1,
1463 N_("Warn when a variable is unused") },
1464 {"unused-value", &warn_unused_value, 1,
1465 N_("Warn when an expression value is unused") },
1466 {"system-headers", &warn_system_headers, 1,
1467 N_("Do not suppress warnings from system headers") },
1468 {"error", &warnings_are_errors, 1,
1469 N_("Treat all warnings as errors") },
1470 {"shadow", &warn_shadow, 1,
1471 N_("Warn when one local variable shadows another") },
1472 {"switch", &warn_switch, 1,
1473 N_("Warn about enumerated switches, with no default, missing a case") },
1474 {"switch-default", &warn_switch_default, 1,
1475 N_("Warn about enumerated switches missing a default case") },
1476 {"aggregate-return", &warn_aggregate_return, 1,
1477 N_("Warn about returning structures, unions or arrays") },
1478 {"cast-align", &warn_cast_align, 1,
1479 N_("Warn about pointer casts which increase alignment") },
1480 {"unreachable-code", &warn_notreached, 1,
1481 N_("Warn about code that will never be executed") },
1482 {"uninitialized", &warn_uninitialized, 1,
1483 N_("Warn about uninitialized automatic variables") },
1484 {"inline", &warn_inline, 1,
1485 N_("Warn when an inlined function cannot be inlined") },
1486 {"packed", &warn_packed, 1,
1487 N_("Warn when the packed attribute has no effect on struct layout") },
1488 {"padded", &warn_padded, 1,
1489 N_("Warn when padding is required to align struct members") },
1490 {"disabled-optimization", &warn_disabled_optimization, 1,
1491 N_("Warn when an optimization pass is disabled") },
1492 {"deprecated-declarations", &warn_deprecated_decl, 1,
1493 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1494 {"missing-noreturn", &warn_missing_noreturn, 1,
1495 N_("Warn about functions which might be candidates for attribute noreturn") }
1499 set_Wunused (setting)
1502 warn_unused_function = setting;
1503 warn_unused_label = setting;
1504 /* Unused function parameter warnings are reported when either ``-W
1505 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1506 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1508 warn_unused_parameter = 0;
1509 else if (!warn_unused_parameter)
1510 warn_unused_parameter = -1;
1511 warn_unused_variable = setting;
1512 warn_unused_value = setting;
1515 /* The following routines are useful in setting all the flags that
1516 -ffast-math and -fno-fast-math imply. */
1519 set_fast_math_flags ()
1521 flag_trapping_math = 0;
1522 flag_unsafe_math_optimizations = 1;
1523 flag_errno_math = 0;
1527 set_no_fast_math_flags ()
1529 flag_trapping_math = 1;
1530 flag_unsafe_math_optimizations = 0;
1531 flag_errno_math = 1;
1535 /* Output files for assembler code (real compiler output)
1536 and debugging dumps. */
1539 FILE *aux_info_file;
1540 FILE *rtl_dump_file = NULL;
1542 /* Decode the string P as an integral parameter.
1543 If the string is indeed an integer return its numeric value else
1544 issue an Invalid Option error for the option PNAME and return DEFVAL.
1545 If PNAME is zero just return DEFVAL, do not call error. */
1548 read_integral_parameter (p, pname, defval)
1553 const char *endp = p;
1557 if (ISDIGIT (*endp))
1566 error ("invalid option `%s'", pname);
1573 /* This calls abort and is used to avoid problems when abort if a macro.
1574 It is used when we need to pass the address of abort. */
1582 /* When `malloc.c' is compiled with `rcheck' defined,
1583 it calls this function to report clobberage. */
1587 const char *s ATTRIBUTE_UNUSED;
1592 /* Return the logarithm of X, base 2, considering X unsigned,
1593 if X is a power of 2. Otherwise, returns -1.
1595 This should be used via the `exact_log2' macro. */
1599 unsigned HOST_WIDE_INT x;
1602 /* Test for 0 or a power of 2. */
1603 if (x == 0 || x != (x & -x))
1605 while ((x >>= 1) != 0)
1610 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1611 If X is 0, return -1.
1613 This should be used via the floor_log2 macro. */
1617 unsigned HOST_WIDE_INT x;
1626 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1627 into ICE messages, which is much more user friendly. */
1630 crash_signal (signo)
1633 internal_error ("internal error: %s", strsignal (signo));
1636 /* Strip off a legitimate source ending from the input string NAME of
1637 length LEN. Rather than having to know the names used by all of
1638 our front ends, we strip off an ending of a period followed by
1639 up to five characters. (Java uses ".class".) */
1642 strip_off_ending (name, len)
1647 for (i = 2; i < 6 && len > i; i++)
1649 if (name[len - i] == '.')
1651 name[len - i] = '\0';
1657 /* Output a quoted string. */
1660 output_quoted_string (asm_file, string)
1664 #ifdef OUTPUT_QUOTED_STRING
1665 OUTPUT_QUOTED_STRING (asm_file, string);
1669 putc ('\"', asm_file);
1670 while ((c = *string++) != 0)
1674 if (c == '\"' || c == '\\')
1675 putc ('\\', asm_file);
1679 fprintf (asm_file, "\\%03o", c);
1681 putc ('\"', asm_file);
1685 /* Output a file name in the form wanted by System V. */
1688 output_file_directive (asm_file, input_name)
1690 const char *input_name;
1692 int len = strlen (input_name);
1693 const char *na = input_name + len;
1695 /* NA gets INPUT_NAME sans directory names. */
1696 while (na > input_name)
1698 if (IS_DIR_SEPARATOR (na[-1]))
1703 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1704 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1706 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1707 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1709 fprintf (asm_file, "\t.file\t");
1710 output_quoted_string (asm_file, na);
1711 fputc ('\n', asm_file);
1716 /* Routine to open a dump file. Return true if the dump file is enabled. */
1719 open_dump_file (index, decl)
1720 enum dump_file_index index;
1724 const char *open_arg;
1727 if (! dump_file[index].enabled)
1730 timevar_push (TV_DUMP);
1731 if (rtl_dump_file != NULL)
1732 fclose (rtl_dump_file);
1734 sprintf (seq, DUMPFILE_FORMAT, index);
1736 if (! dump_file[index].initialized)
1738 /* If we've not initialized the files, do so now. */
1739 if (graph_dump_format != no_graph
1740 && dump_file[index].graph_dump_p)
1742 dump_name = concat (seq, dump_file[index].extension, NULL);
1743 clean_graph_dump_file (dump_base_name, dump_name);
1746 dump_file[index].initialized = 1;
1752 dump_name = concat (dump_base_name, seq,
1753 dump_file[index].extension, NULL);
1755 rtl_dump_file = fopen (dump_name, open_arg);
1756 if (rtl_dump_file == NULL)
1757 fatal_io_error ("can't open %s", dump_name);
1762 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1763 (*lang_hooks.decl_printable_name) (decl, 2));
1765 timevar_pop (TV_DUMP);
1769 /* Routine to close a dump file. */
1772 close_dump_file (index, func, insns)
1773 enum dump_file_index index;
1774 void (*func) PARAMS ((FILE *, rtx));
1777 if (! rtl_dump_file)
1780 timevar_push (TV_DUMP);
1782 && graph_dump_format != no_graph
1783 && dump_file[index].graph_dump_p)
1788 sprintf (seq, DUMPFILE_FORMAT, index);
1789 suffix = concat (seq, dump_file[index].extension, NULL);
1790 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1795 func (rtl_dump_file, insns);
1797 fflush (rtl_dump_file);
1798 fclose (rtl_dump_file);
1800 rtl_dump_file = NULL;
1801 timevar_pop (TV_DUMP);
1804 /* Do any final processing required for the declarations in VEC, of
1805 which there are LEN. We write out inline functions and variables
1806 that have been deferred until this point, but which are required.
1807 Returns non-zero if anything was put out. */
1810 wrapup_global_declarations (vec, len)
1817 int output_something = 0;
1819 for (i = 0; i < len; i++)
1823 /* We're not deferring this any longer. */
1824 DECL_DEFER_OUTPUT (decl) = 0;
1826 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1827 && incomplete_decl_finalize_hook != 0)
1828 (*incomplete_decl_finalize_hook) (decl);
1831 /* Now emit any global variables or functions that we have been
1832 putting off. We need to loop in case one of the things emitted
1833 here references another one which comes earlier in the list. */
1837 for (i = 0; i < len; i++)
1841 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1844 /* Don't write out static consts, unless we still need them.
1846 We also keep static consts if not optimizing (for debugging),
1847 unless the user specified -fno-keep-static-consts.
1848 ??? They might be better written into the debug information.
1849 This is possible when using DWARF.
1851 A language processor that wants static constants to be always
1852 written out (even if it is not used) is responsible for
1853 calling rest_of_decl_compilation itself. E.g. the C front-end
1854 calls rest_of_decl_compilation from finish_decl.
1855 One motivation for this is that is conventional in some
1856 environments to write things like:
1857 static const char rcsid[] = "... version string ...";
1858 intending to force the string to be in the executable.
1860 A language processor that would prefer to have unneeded
1861 static constants "optimized away" would just defer writing
1862 them out until here. E.g. C++ does this, because static
1863 constants are often defined in header files.
1865 ??? A tempting alternative (for both C and C++) would be
1866 to force a constant to be written if and only if it is
1867 defined in a main file, as opposed to an include file. */
1869 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1873 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1875 else if (DECL_COMDAT (decl))
1877 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1878 && (optimize || !flag_keep_static_consts
1879 || DECL_ARTIFICIAL (decl)))
1885 rest_of_decl_compilation (decl, NULL, 1, 1);
1889 if (TREE_CODE (decl) == FUNCTION_DECL
1890 && DECL_INITIAL (decl) != 0
1891 && DECL_SAVED_INSNS (decl) != 0
1892 && (flag_keep_inline_functions
1893 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1894 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1897 output_inline_function (decl);
1902 output_something = 1;
1906 return output_something;
1909 /* Issue appropriate warnings for the global declarations in VEC (of
1910 which there are LEN). Output debugging information for them. */
1913 check_global_declarations (vec, len)
1920 for (i = 0; i < len; i++)
1924 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1925 && ! TREE_ASM_WRITTEN (decl))
1926 /* Cancel the RTL for this decl so that, if debugging info
1927 output for global variables is still to come,
1928 this one will be omitted. */
1929 SET_DECL_RTL (decl, NULL_RTX);
1931 /* Warn about any function
1932 declared static but not defined.
1933 We don't warn about variables,
1934 because many programs have static variables
1935 that exist only to get some text into the object file. */
1936 if (TREE_CODE (decl) == FUNCTION_DECL
1937 && (warn_unused_function
1938 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1939 && DECL_INITIAL (decl) == 0
1940 && DECL_EXTERNAL (decl)
1941 && ! DECL_ARTIFICIAL (decl)
1942 && ! TREE_PUBLIC (decl))
1944 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1945 pedwarn_with_decl (decl,
1946 "`%s' used but never defined");
1948 warning_with_decl (decl,
1949 "`%s' declared `static' but never defined");
1950 /* This symbol is effectively an "extern" declaration now. */
1951 TREE_PUBLIC (decl) = 1;
1952 assemble_external (decl);
1955 /* Warn about static fns or vars defined but not used,
1956 but not about inline functions or static consts
1957 since defining those in header files is normal practice. */
1958 if (((warn_unused_function
1959 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
1960 || (warn_unused_variable
1961 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1962 && ! DECL_IN_SYSTEM_HEADER (decl)
1963 && ! DECL_EXTERNAL (decl)
1964 && ! TREE_PUBLIC (decl)
1965 && ! TREE_USED (decl)
1966 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
1967 /* The TREE_USED bit for file-scope decls
1968 is kept in the identifier, to handle multiple
1969 external decls in different scopes. */
1970 && ! TREE_USED (DECL_NAME (decl)))
1971 warning_with_decl (decl, "`%s' defined but not used");
1973 timevar_push (TV_SYMOUT);
1974 (*debug_hooks->global_decl) (decl);
1975 timevar_pop (TV_SYMOUT);
1979 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
1980 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1981 INPUT_FILENAME and LINENO accordingly. */
1984 push_srcloc (file, line)
1988 struct file_stack *fs;
1990 if (input_file_stack)
1992 input_file_stack->name = input_filename;
1993 input_file_stack->line = lineno;
1996 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
1997 fs->name = input_filename = file;
1998 fs->line = lineno = line;
1999 fs->indent_level = 0;
2000 fs->next = input_file_stack;
2001 input_file_stack = fs;
2002 input_file_stack_tick++;
2005 /* Pop the top entry off the stack of presently open source files.
2006 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2012 struct file_stack *fs;
2014 fs = input_file_stack;
2015 input_file_stack = fs->next;
2017 input_file_stack_tick++;
2018 /* The initial source file is never popped. */
2019 if (!input_file_stack)
2021 input_filename = input_file_stack->name;
2022 lineno = input_file_stack->line;
2025 /* Compile an entire translation unit. Write a file of assembly
2026 output and various debugging dumps. */
2033 /* Initialize yet another pass. */
2035 init_final (main_input_filename);
2036 init_branch_prob (dump_base_name);
2038 timevar_push (TV_PARSE);
2040 /* Call the parser, which parses the entire file (calling
2041 rest_of_compilation for each function). */
2042 (*lang_hooks.parse_file) ();
2044 /* In case there were missing block closers,
2045 get us back to the global binding level. */
2046 (*lang_hooks.clear_binding_stack) ();
2048 /* Compilation is now finished except for writing
2049 what's left of the symbol table output. */
2050 timevar_pop (TV_PARSE);
2052 if (flag_syntax_only)
2055 globals = (*lang_hooks.decls.getdecls) ();
2057 /* Really define vars that have had only a tentative definition.
2058 Really output inline functions that must actually be callable
2059 and have not been output so far. */
2062 int len = list_length (globals);
2063 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2067 /* Process the decls in reverse order--earliest first.
2068 Put them into VEC from back to front, then take out from front. */
2070 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2071 vec[len - i - 1] = decl;
2073 wrapup_global_declarations (vec, len);
2075 /* This must occur after the loop to output deferred functions. Else
2076 the profiler initializer would not be emitted if all the functions
2077 in this compilation unit were deferred.
2079 output_func_start_profiler can not cause any additional functions or
2080 data to need to be output, so it need not be in the deferred function
2082 output_func_start_profiler ();
2084 check_global_declarations (vec, len);
2090 /* Write out any pending weak symbol declarations. */
2094 /* Do dbx symbols. */
2095 timevar_push (TV_SYMOUT);
2097 #ifdef DWARF2_UNWIND_INFO
2098 if (dwarf2out_do_frame ())
2099 dwarf2out_frame_finish ();
2102 (*debug_hooks->finish) (main_input_filename);
2103 timevar_pop (TV_SYMOUT);
2105 /* Output some stuff at end of file if nec. */
2107 dw2_output_indirect_constants ();
2109 end_final (dump_base_name);
2111 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2113 timevar_push (TV_DUMP);
2114 open_dump_file (DFI_bp, NULL);
2118 close_dump_file (DFI_bp, NULL, NULL_RTX);
2119 timevar_pop (TV_DUMP);
2123 ASM_FILE_END (asm_out_file);
2126 /* Attach a special .ident directive to the end of the file to identify
2127 the version of GCC which compiled this code. The format of the .ident
2128 string is patterned after the ones produced by native SVR4 compilers. */
2131 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2132 IDENT_ASM_OP, version_string);
2135 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2137 timevar_push (TV_DUMP);
2138 dump_combine_total_stats (rtl_dump_file);
2139 close_dump_file (DFI_combine, NULL, NULL_RTX);
2140 timevar_pop (TV_DUMP);
2144 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2145 and TYPE_DECL nodes.
2147 This does nothing for local (non-static) variables, unless the
2148 variable is a register variable with an ASMSPEC. In that case, or
2149 if the variable is not an automatic, it sets up the RTL and
2150 outputs any assembler code (label definition, storage allocation
2151 and initialization).
2153 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2154 the assembler symbol name to be used. TOP_LEVEL is nonzero
2155 if this declaration is not within a function. */
2158 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2160 const char *asmspec;
2164 /* Declarations of variables, and of functions defined elsewhere. */
2166 /* The most obvious approach, to put an #ifndef around where
2167 this macro is used, doesn't work since it's inside a macro call. */
2168 #ifndef ASM_FINISH_DECLARE_OBJECT
2169 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2172 /* We deferred calling assemble_alias so that we could collect
2173 other attributes such as visibility. Emit the alias now. */
2176 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2179 alias = TREE_VALUE (TREE_VALUE (alias));
2180 alias = get_identifier (TREE_STRING_POINTER (alias));
2181 assemble_alias (decl, alias);
2185 /* Forward declarations for nested functions are not "external",
2186 but we need to treat them as if they were. */
2187 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2188 || TREE_CODE (decl) == FUNCTION_DECL)
2190 timevar_push (TV_VARCONST);
2193 make_decl_rtl (decl, asmspec);
2195 /* Don't output anything when a tentative file-scope definition
2196 is seen. But at end of compilation, do output code for them. */
2197 if (at_end || !DECL_DEFER_OUTPUT (decl))
2198 assemble_variable (decl, top_level, at_end, 0);
2199 if (decl == last_assemble_variable_decl)
2201 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2205 timevar_pop (TV_VARCONST);
2207 else if (DECL_REGISTER (decl) && asmspec != 0)
2209 if (decode_reg_name (asmspec) >= 0)
2211 SET_DECL_RTL (decl, NULL_RTX);
2212 make_decl_rtl (decl, asmspec);
2216 error ("invalid register name `%s' for register variable", asmspec);
2217 DECL_REGISTER (decl) = 0;
2222 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2223 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2224 && TREE_CODE (decl) == TYPE_DECL)
2226 timevar_push (TV_SYMOUT);
2227 dbxout_symbol (decl, 0);
2228 timevar_pop (TV_SYMOUT);
2231 #ifdef SDB_DEBUGGING_INFO
2232 else if (write_symbols == SDB_DEBUG && top_level
2233 && TREE_CODE (decl) == TYPE_DECL)
2235 timevar_push (TV_SYMOUT);
2236 sdbout_symbol (decl, 0);
2237 timevar_pop (TV_SYMOUT);
2242 /* Called after finishing a record, union or enumeral type. */
2245 rest_of_type_compilation (type, toplev)
2246 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2250 tree type ATTRIBUTE_UNUSED;
2251 int toplev ATTRIBUTE_UNUSED;
2254 timevar_push (TV_SYMOUT);
2255 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2256 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2257 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2259 #ifdef SDB_DEBUGGING_INFO
2260 if (write_symbols == SDB_DEBUG)
2261 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2263 #ifdef DWARF2_DEBUGGING_INFO
2264 if ((write_symbols == DWARF2_DEBUG
2265 || write_symbols == VMS_AND_DWARF2_DEBUG)
2267 dwarf2out_decl (TYPE_STUB_DECL (type));
2269 timevar_pop (TV_SYMOUT);
2272 /* This is called from finish_function (within langhooks.parse_file)
2273 after each top-level definition is parsed.
2274 It is supposed to compile that function or variable
2275 and output the assembler code for it.
2276 After we return, the tree storage is freed. */
2279 rest_of_compilation (decl)
2285 int rebuild_label_notes_after_reload;
2286 int register_life_up_to_date;
2288 timevar_push (TV_REST_OF_COMPILATION);
2290 /* Now that we're out of the frontend, we shouldn't have any more
2291 CONCATs anywhere. */
2292 generating_concat_p = 0;
2294 /* When processing delayed functions, prepare_function_start() won't
2295 have been run to re-initialize it. */
2296 cse_not_expected = ! optimize;
2298 /* First, make sure that NOTE_BLOCK is set correctly for each
2299 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2300 if (!cfun->x_whole_function_mode_p)
2303 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2304 tree in sensible shape. So, we just recalculate it here. */
2305 if (cfun->x_whole_function_mode_p)
2310 /* If we are reconsidering an inline function
2311 at the end of compilation, skip the stuff for making it inline. */
2313 if (DECL_SAVED_INSNS (decl) == 0)
2319 /* If this is nested inside an inlined external function, pretend
2320 it was only declared. Since we cannot inline such functions,
2321 generating code for this one is not only not necessary but will
2322 confuse some debugging output writers. */
2323 for (parent = DECL_CONTEXT (current_function_decl);
2324 parent != NULL_TREE;
2325 parent = get_containing_scope (parent))
2326 if (TREE_CODE (parent) == FUNCTION_DECL
2327 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2329 DECL_INITIAL (decl) = 0;
2330 goto exit_rest_of_compilation;
2333 /* If requested, consider whether to make this function inline. */
2334 if ((DECL_INLINE (decl) && !flag_no_inline)
2335 || flag_inline_functions)
2337 timevar_push (TV_INTEGRATION);
2338 lose = function_cannot_inline_p (decl);
2339 timevar_pop (TV_INTEGRATION);
2340 if (lose || ! optimize)
2342 if (warn_inline && DECL_INLINE (decl))
2343 warning_with_decl (decl, lose);
2344 DECL_ABSTRACT_ORIGIN (decl) = 0;
2345 /* Don't really compile an extern inline function.
2346 If we can't make it inline, pretend
2347 it was only declared. */
2348 if (DECL_EXTERNAL (decl))
2350 DECL_INITIAL (decl) = 0;
2351 goto exit_rest_of_compilation;
2355 /* ??? Note that this has the effect of making it look
2356 like "inline" was specified for a function if we choose
2357 to inline it. This isn't quite right, but it's
2358 probably not worth the trouble to fix. */
2359 inlinable = DECL_INLINE (decl) = 1;
2362 insns = get_insns ();
2364 /* Dump the rtl code if we are dumping rtl. */
2366 if (open_dump_file (DFI_rtl, decl))
2368 if (DECL_SAVED_INSNS (decl))
2369 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2370 close_dump_file (DFI_rtl, print_rtl, insns);
2373 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2374 sorts of eh initialization. Delay this until after the
2375 initial rtl dump so that we can see the original nesting. */
2376 convert_from_eh_region_ranges ();
2378 /* If function is inline, and we don't yet know whether to
2379 compile it by itself, defer decision till end of compilation.
2380 finish_compilation will call rest_of_compilation again
2381 for those functions that need to be output. Also defer those
2382 functions that we are supposed to defer. */
2385 || (DECL_INLINE (decl)
2386 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2387 && ! flag_keep_inline_functions)
2388 || DECL_EXTERNAL (decl))))
2389 DECL_DEFER_OUTPUT (decl) = 1;
2391 if (DECL_INLINE (decl))
2392 /* DWARF wants separate debugging info for abstract and
2393 concrete instances of all inline functions, including those
2394 declared inline but not inlined, and those inlined even
2395 though they weren't declared inline. Conveniently, that's
2396 what DECL_INLINE means at this point. */
2397 (*debug_hooks->deferred_inline_function) (decl);
2399 if (DECL_DEFER_OUTPUT (decl))
2401 /* If -Wreturn-type, we have to do a bit of compilation. We just
2402 want to call cleanup the cfg to figure out whether or not we can
2403 fall off the end of the function; we do the minimum amount of
2404 work necessary to make that safe. */
2405 if (warn_return_type)
2407 int saved_optimize = optimize;
2410 rebuild_jump_labels (insns);
2411 find_exception_handler_labels ();
2412 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2413 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2414 optimize = saved_optimize;
2416 /* CFG is no longer maintained up-to-date. */
2417 free_bb_for_insn ();
2420 current_function_nothrow = nothrow_function_p ();
2421 if (current_function_nothrow)
2422 /* Now we know that this can't throw; set the flag for the benefit
2423 of other functions later in this translation unit. */
2424 TREE_NOTHROW (current_function_decl) = 1;
2426 timevar_push (TV_INTEGRATION);
2427 save_for_inline (decl);
2428 timevar_pop (TV_INTEGRATION);
2429 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2430 goto exit_rest_of_compilation;
2433 /* If specified extern inline but we aren't inlining it, we are
2434 done. This goes for anything that gets here with DECL_EXTERNAL
2435 set, not just things with DECL_INLINE. */
2436 if (DECL_EXTERNAL (decl))
2437 goto exit_rest_of_compilation;
2440 /* If we're emitting a nested function, make sure its parent gets
2441 emitted as well. Doing otherwise confuses debug info. */
2444 for (parent = DECL_CONTEXT (current_function_decl);
2445 parent != NULL_TREE;
2446 parent = get_containing_scope (parent))
2447 if (TREE_CODE (parent) == FUNCTION_DECL)
2448 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2451 /* We are now committed to emitting code for this function. Do any
2452 preparation, such as emitting abstract debug info for the inline
2453 before it gets mangled by optimization. */
2454 if (DECL_INLINE (decl))
2455 (*debug_hooks->outlining_inline_function) (decl);
2457 /* Remove any notes we don't need. That will make iterating
2458 over the instruction sequence faster, and allow the garbage
2459 collector to reclaim the memory used by the notes. */
2460 remove_unnecessary_notes ();
2465 /* Initialize some variables used by the optimizers. */
2466 init_function_for_compilation ();
2468 if (! DECL_DEFER_OUTPUT (decl))
2469 TREE_ASM_WRITTEN (decl) = 1;
2471 /* Now that integrate will no longer see our rtl, we need not
2472 distinguish between the return value of this function and the
2473 return value of called functions. Also, we can remove all SETs
2474 of subregs of hard registers; they are only here because of
2475 integrate. Also, we can now initialize pseudos intended to
2476 carry magic hard reg data throughout the function. */
2477 rtx_equal_function_value_matters = 0;
2478 purge_hard_subreg_sets (get_insns ());
2479 emit_initial_value_sets ();
2481 /* Early return if there were errors. We can run afoul of our
2482 consistency checks, and there's not really much point in fixing them.
2483 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2484 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2485 || errorcount || sorrycount)
2486 goto exit_rest_of_compilation;
2488 /* We may have potential sibling or tail recursion sites. Select one
2489 (of possibly multiple) methods of performing the call. */
2490 if (flag_optimize_sibling_calls)
2492 timevar_push (TV_JUMP);
2493 open_dump_file (DFI_sibling, decl);
2495 optimize_sibling_and_tail_recursive_calls ();
2497 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2498 timevar_pop (TV_JUMP);
2501 /* Complete generation of exception handling code. */
2502 find_exception_handler_labels ();
2505 timevar_push (TV_JUMP);
2506 open_dump_file (DFI_eh, decl);
2508 finish_eh_generation ();
2510 close_dump_file (DFI_eh, print_rtl, get_insns ());
2511 timevar_pop (TV_JUMP);
2515 /* If we are doing position-independent code generation, now
2516 is the time to output special prologues and epilogues.
2517 We do not want to do this earlier, because it just clutters
2518 up inline functions with meaningless insns. */
2523 insns = get_insns ();
2525 /* Copy any shared structure that should not be shared. */
2526 unshare_all_rtl (current_function_decl, insns);
2528 #ifdef SETJMP_VIA_SAVE_AREA
2529 /* This must be performed before virtual register instantiation. */
2530 if (current_function_calls_alloca)
2531 optimize_save_area_alloca (insns);
2534 /* Instantiate all virtual registers. */
2535 instantiate_virtual_regs (current_function_decl, insns);
2537 open_dump_file (DFI_jump, decl);
2539 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2540 are initialized and to compute whether control can drop off the end
2543 timevar_push (TV_JUMP);
2544 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2545 before jump optimization switches branch directions. */
2546 expected_value_to_br_prob ();
2548 reg_scan (insns, max_reg_num (), 0);
2549 rebuild_jump_labels (insns);
2550 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2552 dump_flow_info (rtl_dump_file);
2553 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2554 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2556 /* CFG is no longer maintained up-to-date. */
2557 free_bb_for_insn ();
2558 copy_loop_headers (insns);
2559 purge_line_number_notes (insns);
2561 timevar_pop (TV_JUMP);
2562 close_dump_file (DFI_jump, print_rtl, insns);
2564 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2565 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2567 goto exit_rest_of_compilation;
2570 /* Long term, this should probably move before the jump optimizer too,
2571 but I didn't want to disturb the rtl_dump_and_exit and related
2572 stuff at this time. */
2573 if (optimize > 0 && flag_ssa)
2575 /* Convert to SSA form. */
2577 timevar_push (TV_TO_SSA);
2578 open_dump_file (DFI_ssa, decl);
2580 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2581 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2584 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2585 timevar_pop (TV_TO_SSA);
2587 /* Perform sparse conditional constant propagation, if requested. */
2590 timevar_push (TV_SSA_CCP);
2591 open_dump_file (DFI_ssa_ccp, decl);
2595 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2596 timevar_pop (TV_SSA_CCP);
2599 /* It would be useful to cleanup the CFG at this point, but block
2600 merging and possibly other transformations might leave a PHI
2601 node in the middle of a basic block, which is a strict no-no. */
2603 /* The SSA implementation uses basic block numbers in its phi
2604 nodes. Thus, changing the control-flow graph or the basic
2605 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2606 may cause problems. */
2610 /* Remove dead code. */
2612 timevar_push (TV_SSA_DCE);
2613 open_dump_file (DFI_ssa_dce, decl);
2615 insns = get_insns ();
2616 ssa_eliminate_dead_code();
2618 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2619 timevar_pop (TV_SSA_DCE);
2622 /* Convert from SSA form. */
2624 timevar_push (TV_FROM_SSA);
2625 open_dump_file (DFI_ussa, decl);
2627 convert_from_ssa ();
2628 /* New registers have been created. Rescan their usage. */
2629 reg_scan (insns, max_reg_num (), 1);
2631 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2632 timevar_pop (TV_FROM_SSA);
2635 /* CFG is no longer maintained up-to-date. */
2636 free_bb_for_insn ();
2639 timevar_push (TV_JUMP);
2643 open_dump_file (DFI_null, decl);
2644 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2646 dump_flow_info (rtl_dump_file);
2647 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2649 /* Try to identify useless null pointer tests and delete them. */
2650 if (flag_delete_null_pointer_checks)
2651 delete_null_pointer_checks (insns);
2653 timevar_push (TV_IFCVT);
2655 timevar_pop (TV_IFCVT);
2656 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2657 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2660 /* Jump optimization, and the removal of NULL pointer checks, may
2661 have reduced the number of instructions substantially. CSE, and
2662 future passes, allocate arrays whose dimensions involve the
2663 maximum instruction UID, so if we can reduce the maximum UID
2664 we'll save big on memory. */
2665 renumber_insns (rtl_dump_file);
2667 compute_bb_for_insn (get_max_uid ());
2668 timevar_pop (TV_JUMP);
2670 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2674 /* Perform common subexpression elimination.
2675 Nonzero value from `cse_main' means that jumps were simplified
2676 and some code may now be unreachable, so do
2677 jump optimization again. */
2681 open_dump_file (DFI_cse, decl);
2683 dump_flow_info (rtl_dump_file);
2684 timevar_push (TV_CSE);
2686 reg_scan (insns, max_reg_num (), 1);
2688 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2690 rebuild_jump_labels (insns);
2691 purge_all_dead_edges (0);
2693 delete_trivially_dead_insns (insns, max_reg_num ());
2695 /* If we are not running more CSE passes, then we are no longer
2696 expecting CSE to be run. But always rerun it in a cheap mode. */
2697 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2699 if (tem || optimize > 1)
2700 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2701 /* Try to identify useless null pointer tests and delete them. */
2702 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2704 timevar_push (TV_JUMP);
2706 if (flag_delete_null_pointer_checks)
2707 delete_null_pointer_checks (insns);
2708 /* CFG is no longer maintained up-to-date. */
2709 timevar_pop (TV_JUMP);
2712 /* The second pass of jump optimization is likely to have
2713 removed a bunch more instructions. */
2714 renumber_insns (rtl_dump_file);
2715 compute_bb_for_insn (get_max_uid ());
2717 timevar_pop (TV_CSE);
2718 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2721 open_dump_file (DFI_addressof, decl);
2723 purge_addressof (insns);
2725 purge_all_dead_edges (0);
2726 reg_scan (insns, max_reg_num (), 1);
2728 close_dump_file (DFI_addressof, print_rtl, insns);
2732 /* Perform global cse. */
2734 if (optimize > 0 && flag_gcse)
2736 int save_csb, save_cfj;
2739 timevar_push (TV_GCSE);
2740 open_dump_file (DFI_gcse, decl);
2742 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2743 tem = gcse_main (insns, rtl_dump_file);
2744 rebuild_jump_labels (insns);
2745 delete_trivially_dead_insns (insns, max_reg_num ());
2747 save_csb = flag_cse_skip_blocks;
2748 save_cfj = flag_cse_follow_jumps;
2749 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2751 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2753 if (flag_expensive_optimizations)
2755 timevar_push (TV_CSE);
2756 reg_scan (insns, max_reg_num (), 1);
2757 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2758 purge_all_dead_edges (0);
2759 delete_trivially_dead_insns (insns, max_reg_num ());
2760 timevar_pop (TV_CSE);
2761 cse_not_expected = !flag_rerun_cse_after_loop;
2764 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2765 things up. Then possibly re-run CSE again. */
2769 timevar_push (TV_JUMP);
2770 rebuild_jump_labels (insns);
2771 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2772 timevar_pop (TV_JUMP);
2774 if (flag_expensive_optimizations)
2776 timevar_push (TV_CSE);
2777 reg_scan (insns, max_reg_num (), 1);
2778 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2779 purge_all_dead_edges (0);
2780 delete_trivially_dead_insns (insns, max_reg_num ());
2781 timevar_pop (TV_CSE);
2785 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2786 timevar_pop (TV_GCSE);
2789 flag_cse_skip_blocks = save_csb;
2790 flag_cse_follow_jumps = save_cfj;
2791 #ifdef ENABLE_CHECKING
2792 verify_flow_info ();
2796 /* Move constant computations out of loops. */
2798 if (optimize > 0 && flag_loop_optimize)
2800 timevar_push (TV_LOOP);
2801 delete_dead_jumptables ();
2802 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2803 open_dump_file (DFI_loop, decl);
2804 /* CFG is no longer maintained up-to-date. */
2805 free_bb_for_insn ();
2807 if (flag_rerun_loop_opt)
2809 cleanup_barriers ();
2811 /* We only want to perform unrolling once. */
2813 loop_optimize (insns, rtl_dump_file, 0);
2815 /* The first call to loop_optimize makes some instructions
2816 trivially dead. We delete those instructions now in the
2817 hope that doing so will make the heuristics in loop work
2818 better and possibly speed up compilation. */
2819 delete_trivially_dead_insns (insns, max_reg_num ());
2821 /* The regscan pass is currently necessary as the alias
2822 analysis code depends on this information. */
2823 reg_scan (insns, max_reg_num (), 1);
2825 cleanup_barriers ();
2826 loop_optimize (insns, rtl_dump_file,
2827 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2828 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2830 /* Loop can create trivially dead instructions. */
2831 delete_trivially_dead_insns (insns, max_reg_num ());
2832 close_dump_file (DFI_loop, print_rtl, insns);
2833 timevar_pop (TV_LOOP);
2838 /* Do control and data flow analysis; wrote some of the results to
2841 timevar_push (TV_FLOW);
2842 open_dump_file (DFI_cfg, decl);
2844 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2846 dump_flow_info (rtl_dump_file);
2847 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2848 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2850 /* It may make more sense to mark constant functions after dead code is
2851 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2852 may insert code making function non-constant, but we still must consider
2853 it as constant, otherwise -fbranch-probabilities will not read data back.
2855 life_analyzis rarely eliminates modification of external memory.
2857 mark_constant_function ();
2859 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2861 /* Do branch profiling and static profile estimation passes. */
2862 if (optimize > 0 || profile_arc_flag || flag_test_coverage
2863 || flag_branch_probabilities)
2867 timevar_push (TV_BRANCH_PROB);
2868 open_dump_file (DFI_bp, decl);
2869 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2872 /* Discover and record the loop depth at the head of each basic
2873 block. The loop infrastructure does the real job for us. */
2874 flow_loops_find (&loops, LOOP_TREE);
2876 /* Estimate using heuristics if no profiling info is available. */
2877 if (flag_guess_branch_prob)
2878 estimate_probability (&loops);
2881 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2883 flow_loops_free (&loops);
2884 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2885 timevar_pop (TV_BRANCH_PROB);
2890 timevar_push (TV_CSE2);
2891 open_dump_file (DFI_cse2, decl);
2893 dump_flow_info (rtl_dump_file);
2895 if (flag_rerun_cse_after_loop)
2897 timevar_push (TV_JUMP);
2899 reg_scan (insns, max_reg_num (), 0);
2901 timevar_push (TV_IFCVT);
2902 cleanup_cfg (CLEANUP_EXPENSIVE);
2904 timevar_pop(TV_IFCVT);
2906 timevar_pop (TV_JUMP);
2907 /* CFG is no longer maintained up-to-date. */
2908 reg_scan (insns, max_reg_num (), 0);
2909 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2910 purge_all_dead_edges (0);
2911 delete_trivially_dead_insns (insns, max_reg_num ());
2915 timevar_push (TV_JUMP);
2916 rebuild_jump_labels (insns);
2917 cleanup_cfg (CLEANUP_EXPENSIVE);
2918 timevar_pop (TV_JUMP);
2922 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2923 timevar_pop (TV_CSE2);
2928 cse_not_expected = 1;
2930 open_dump_file (DFI_life, decl);
2933 check_function_return_warnings ();
2935 #ifdef ENABLE_CHECKING
2936 verify_flow_info ();
2938 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2940 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2941 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2942 timevar_pop (TV_FLOW);
2946 if (warn_uninitialized || extra_warnings)
2948 uninitialized_vars_warning (DECL_INITIAL (decl));
2950 setjmp_args_warning ();
2956 if (initialize_uninitialized_subregs ())
2958 /* Insns were inserted, so things might look a bit different. */
2959 insns = get_insns ();
2960 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
2961 PROP_LOG_LINKS | PROP_REG_INFO
2962 | PROP_DEATH_NOTES);
2966 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2970 /* If -opt, try combining insns through substitution. */
2974 int rebuild_jump_labels_after_combine = 0;
2976 timevar_push (TV_COMBINE);
2977 open_dump_file (DFI_combine, decl);
2979 rebuild_jump_labels_after_combine
2980 = combine_instructions (insns, max_reg_num ());
2982 /* Combining insns may have turned an indirect jump into a
2983 direct jump. Rebuid the JUMP_LABEL fields of jumping
2985 if (rebuild_jump_labels_after_combine)
2987 timevar_push (TV_JUMP);
2988 rebuild_jump_labels (insns);
2989 timevar_pop (TV_JUMP);
2991 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2994 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2995 timevar_pop (TV_COMBINE);
3000 /* Rerun if-conversion, as combine may have simplified things enough to
3001 now meet sequence length restrictions. */
3004 timevar_push (TV_IFCVT);
3005 open_dump_file (DFI_ce, decl);
3011 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3012 timevar_pop (TV_IFCVT);
3015 /* Register allocation pre-pass, to reduce number of moves
3016 necessary for two-address machines. */
3017 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3019 timevar_push (TV_REGMOVE);
3020 open_dump_file (DFI_regmove, decl);
3022 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3024 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3025 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3026 timevar_pop (TV_REGMOVE);
3031 /* Do unconditional splitting before register allocation to allow machine
3032 description to add extra information not needed previously. */
3033 split_all_insns (1);
3035 /* Any of the several passes since flow1 will have munged register
3036 lifetime data a bit. */
3037 register_life_up_to_date = 0;
3039 #ifdef OPTIMIZE_MODE_SWITCHING
3040 timevar_push (TV_MODE_SWITCH);
3043 optimize_mode_switching (NULL);
3046 timevar_pop (TV_MODE_SWITCH);
3049 timevar_push (TV_SCHED);
3051 #ifdef INSN_SCHEDULING
3053 /* Print function header into sched dump now
3054 because doing the sched analysis makes some of the dump. */
3055 if (optimize > 0 && flag_schedule_insns)
3057 open_dump_file (DFI_sched, decl);
3059 /* Do control and data sched analysis,
3060 and write some of the results to dump file. */
3062 schedule_insns (rtl_dump_file);
3064 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3066 /* Register lifetime information was updated as part of verifying
3068 register_life_up_to_date = 1;
3071 timevar_pop (TV_SCHED);
3075 /* Determine if the current function is a leaf before running reload
3076 since this can impact optimizations done by the prologue and
3077 epilogue thus changing register elimination offsets. */
3078 current_function_is_leaf = leaf_function_p ();
3080 timevar_push (TV_LOCAL_ALLOC);
3081 open_dump_file (DFI_lreg, decl);
3083 /* Allocate pseudo-regs that are used only within 1 basic block.
3085 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3086 jump optimizer after register allocation and reloading are finished. */
3088 if (! register_life_up_to_date)
3089 recompute_reg_usage (insns, ! optimize_size);
3091 /* Allocate the reg_renumber array. */
3092 allocate_reg_info (max_regno, FALSE, TRUE);
3094 /* And the reg_equiv_memory_loc array. */
3095 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3097 allocate_initial_values (reg_equiv_memory_loc);
3099 regclass (insns, max_reg_num (), rtl_dump_file);
3100 rebuild_label_notes_after_reload = local_alloc ();
3102 timevar_pop (TV_LOCAL_ALLOC);
3104 if (dump_file[DFI_lreg].enabled)
3106 timevar_push (TV_DUMP);
3108 dump_flow_info (rtl_dump_file);
3109 dump_local_alloc (rtl_dump_file);
3111 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3112 timevar_pop (TV_DUMP);
3117 timevar_push (TV_GLOBAL_ALLOC);
3118 open_dump_file (DFI_greg, decl);
3120 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3121 pass fixing up any insns that are invalid. */
3124 failure = global_alloc (rtl_dump_file);
3127 build_insn_chain (insns);
3128 failure = reload (insns, 0);
3131 timevar_pop (TV_GLOBAL_ALLOC);
3133 if (dump_file[DFI_greg].enabled)
3135 timevar_push (TV_DUMP);
3137 dump_global_regs (rtl_dump_file);
3139 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3140 timevar_pop (TV_DUMP);
3144 goto exit_rest_of_compilation;
3148 open_dump_file (DFI_postreload, decl);
3150 /* Do a very simple CSE pass over just the hard registers. */
3153 timevar_push (TV_RELOAD_CSE_REGS);
3154 reload_cse_regs (insns);
3155 timevar_pop (TV_RELOAD_CSE_REGS);
3158 /* Register allocation and reloading may have turned an indirect jump into
3159 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3160 jumping instructions. */
3161 if (rebuild_label_notes_after_reload)
3163 timevar_push (TV_JUMP);
3165 rebuild_jump_labels (insns);
3166 purge_all_dead_edges (0);
3168 timevar_pop (TV_JUMP);
3171 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3173 /* Re-create the death notes which were deleted during reload. */
3174 timevar_push (TV_FLOW2);
3175 open_dump_file (DFI_flow2, decl);
3177 #ifdef ENABLE_CHECKING
3178 verify_flow_info ();
3181 /* If optimizing, then go ahead and split insns now. */
3183 split_all_insns (0);
3185 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3187 /* On some machines, the prologue and epilogue code, or parts thereof,
3188 can be represented as RTL. Doing so lets us schedule insns between
3189 it and the rest of the code and also allows delayed branch
3190 scheduling to operate in the epilogue. */
3191 thread_prologue_and_epilogue_insns (insns);
3195 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3196 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3197 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3199 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3200 even for machines with possibly nonzero RETURN_POPS_ARGS
3201 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3202 push instructions will have popping returns. */
3203 #ifndef PUSH_ROUNDING
3204 if (!ACCUMULATE_OUTGOING_ARGS)
3206 combine_stack_adjustments ();
3211 flow2_completed = 1;
3213 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3214 timevar_pop (TV_FLOW2);
3216 #ifdef HAVE_peephole2
3217 if (optimize > 0 && flag_peephole2)
3219 timevar_push (TV_PEEPHOLE2);
3220 open_dump_file (DFI_peephole2, decl);
3222 peephole2_optimize (rtl_dump_file);
3224 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3225 timevar_pop (TV_PEEPHOLE2);
3229 if (flag_rename_registers || flag_cprop_registers)
3231 timevar_push (TV_RENAME_REGISTERS);
3232 open_dump_file (DFI_rnreg, decl);
3234 if (flag_rename_registers)
3235 regrename_optimize ();
3236 if (flag_cprop_registers)
3237 copyprop_hardreg_forward ();
3239 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3240 timevar_pop (TV_RENAME_REGISTERS);
3245 timevar_push (TV_IFCVT2);
3246 open_dump_file (DFI_ce2, decl);
3250 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3251 timevar_pop (TV_IFCVT2);
3255 split_all_insns (1);
3258 #ifdef INSN_SCHEDULING
3259 if (optimize > 0 && flag_schedule_insns_after_reload)
3261 timevar_push (TV_SCHED2);
3262 open_dump_file (DFI_sched2, decl);
3264 /* Do control and data sched analysis again,
3265 and write some more of the results to dump file. */
3267 split_all_insns (1);
3269 schedule_insns (rtl_dump_file);
3271 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3272 timevar_pop (TV_SCHED2);
3278 #ifdef LEAF_REGISTERS
3279 current_function_uses_only_leaf_regs
3280 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3284 timevar_push (TV_REG_STACK);
3285 open_dump_file (DFI_stack, decl);
3287 reg_to_stack (insns, rtl_dump_file);
3289 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3290 timevar_pop (TV_REG_STACK);
3296 timevar_push (TV_REORDER_BLOCKS);
3297 open_dump_file (DFI_bbro, decl);
3299 /* Last attempt to optimize CFG, as scheduling, peepholing
3300 and insn splitting possibly introduced more crossjumping
3302 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3303 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3304 if (flag_reorder_blocks)
3306 reorder_basic_blocks ();
3307 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3310 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3311 timevar_pop (TV_REORDER_BLOCKS);
3313 compute_alignments ();
3315 /* CFG is no longer maintained up-to-date. */
3316 free_bb_for_insn ();
3318 /* If a machine dependent reorganization is needed, call it. */
3319 #ifdef MACHINE_DEPENDENT_REORG
3320 timevar_push (TV_MACH_DEP);
3321 open_dump_file (DFI_mach, decl);
3323 MACHINE_DEPENDENT_REORG (insns);
3325 close_dump_file (DFI_mach, print_rtl, insns);
3326 timevar_pop (TV_MACH_DEP);
3331 purge_line_number_notes (insns);
3332 cleanup_barriers ();
3334 /* If a scheduling pass for delayed branches is to be done,
3335 call the scheduling code. */
3338 if (optimize > 0 && flag_delayed_branch)
3340 timevar_push (TV_DBR_SCHED);
3341 open_dump_file (DFI_dbr, decl);
3343 dbr_schedule (insns, rtl_dump_file);
3345 close_dump_file (DFI_dbr, print_rtl, insns);
3346 timevar_pop (TV_DBR_SCHED);
3352 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3353 timevar_push (TV_SHORTEN_BRANCH);
3354 split_all_insns_noflow ();
3355 timevar_pop (TV_SHORTEN_BRANCH);
3358 convert_to_eh_region_ranges ();
3360 /* Shorten branches. */
3361 timevar_push (TV_SHORTEN_BRANCH);
3362 shorten_branches (get_insns ());
3363 timevar_pop (TV_SHORTEN_BRANCH);
3365 current_function_nothrow = nothrow_function_p ();
3366 if (current_function_nothrow)
3367 /* Now we know that this can't throw; set the flag for the benefit
3368 of other functions later in this translation unit. */
3369 TREE_NOTHROW (current_function_decl) = 1;
3371 /* Now turn the rtl into assembler code. */
3373 timevar_push (TV_FINAL);
3378 /* Get the function's name, as described by its RTL. This may be
3379 different from the DECL_NAME name used in the source file. */
3381 x = DECL_RTL (decl);
3382 if (GET_CODE (x) != MEM)
3385 if (GET_CODE (x) != SYMBOL_REF)
3387 fnname = XSTR (x, 0);
3389 assemble_start_function (decl, fnname);
3390 final_start_function (insns, asm_out_file, optimize);
3391 final (insns, asm_out_file, optimize, 0);
3392 final_end_function ();
3394 #ifdef IA64_UNWIND_INFO
3395 /* ??? The IA-64 ".handlerdata" directive must be issued before
3396 the ".endp" directive that closes the procedure descriptor. */
3397 output_function_exception_table ();
3400 assemble_end_function (decl, fnname);
3402 #ifndef IA64_UNWIND_INFO
3403 /* Otherwise, it feels unclean to switch sections in the middle. */
3404 output_function_exception_table ();
3408 fflush (asm_out_file);
3410 /* Release all memory allocated by flow. */
3411 free_basic_block_vars (0);
3413 /* Release all memory held by regsets now. */
3414 regset_release_memory ();
3416 timevar_pop (TV_FINAL);
3420 /* Write DBX symbols if requested. */
3422 /* Note that for those inline functions where we don't initially
3423 know for certain that we will be generating an out-of-line copy,
3424 the first invocation of this routine (rest_of_compilation) will
3425 skip over this code by doing a `goto exit_rest_of_compilation;'.
3426 Later on, finish_compilation will call rest_of_compilation again
3427 for those inline functions that need to have out-of-line copies
3428 generated. During that call, we *will* be routed past here. */
3430 timevar_push (TV_SYMOUT);
3431 (*debug_hooks->function_decl) (decl);
3432 timevar_pop (TV_SYMOUT);
3434 exit_rest_of_compilation:
3436 /* In case the function was not output,
3437 don't leave any temporary anonymous types
3438 queued up for sdb output. */
3439 #ifdef SDB_DEBUGGING_INFO
3440 if (write_symbols == SDB_DEBUG)
3441 sdbout_types (NULL_TREE);
3444 reload_completed = 0;
3445 flow2_completed = 0;
3448 timevar_push (TV_FINAL);
3450 /* Clear out the insn_length contents now that they are no
3452 init_insn_lengths ();
3454 /* Clear out the real_constant_chain before some of the rtx's
3455 it runs through become garbage. */
3456 clear_const_double_mem ();
3458 /* Show no temporary slots allocated. */
3461 free_basic_block_vars (0);
3462 free_bb_for_insn ();
3464 timevar_pop (TV_FINAL);
3466 /* Make sure volatile mem refs aren't considered valid operands for
3467 arithmetic insns. We must call this here if this is a nested inline
3468 function, since the above code leaves us in the init_recog state
3469 (from final.c), and the function context push/pop code does not
3470 save/restore volatile_ok.
3472 ??? Maybe it isn't necessary for expand_start_function to call this
3473 anymore if we do it here? */
3475 init_recog_no_volatile ();
3477 /* We're done with this function. Free up memory if we can. */
3478 free_after_parsing (cfun);
3479 if (! DECL_DEFER_OUTPUT (decl))
3481 free_after_compilation (cfun);
3483 /* Clear integrate.c's pointer to the cfun structure we just
3485 DECL_SAVED_INSNS (decl) = 0;
3491 timevar_pop (TV_REST_OF_COMPILATION);
3501 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3502 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3503 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3504 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3505 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3506 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"));
3508 for (i = ARRAY_SIZE (f_options); i--;)
3510 const char *description = f_options[i].description;
3512 if (description != NULL && * description != 0)
3513 printf (" -f%-21s %s\n",
3514 f_options[i].string, _(description));
3517 printf (_(" -O[number] Set optimization level to [number]\n"));
3518 printf (_(" -Os Optimize for space rather than speed\n"));
3519 for (i = LAST_PARAM; i--;)
3521 const char *description = compiler_params[i].help;
3522 const int length = 21-strlen(compiler_params[i].option);
3524 if (description != NULL && * description != 0)
3525 printf (" --param %s=<value>%.*s%s\n",
3526 compiler_params[i].option,
3527 length > 0 ? length : 1, " ",
3530 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3531 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3532 printf (_(" -w Suppress warnings\n"));
3533 printf (_(" -W Enable extra warnings\n"));
3535 for (i = ARRAY_SIZE (W_options); i--;)
3537 const char *description = W_options[i].description;
3539 if (description != NULL && * description != 0)
3540 printf (" -W%-21s %s\n",
3541 W_options[i].string, _(description));
3544 printf (_(" -Wunused Enable unused warnings\n"));
3545 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3546 printf (_(" -p Enable function profiling\n"));
3547 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3548 printf (_(" -a Enable block profiling \n"));
3550 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3551 printf (_(" -ax Enable jump profiling \n"));
3553 printf (_(" -o <file> Place output into <file> \n"));
3555 -G <number> Put global and static data smaller than <number>\n\
3556 bytes into a special section (on some targets)\n"));
3558 for (i = ARRAY_SIZE (debug_args); i--;)
3560 if (debug_args[i].description != NULL)
3561 printf (" -g%-21s %s\n",
3562 debug_args[i].arg, _(debug_args[i].description));
3565 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3566 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3567 printf (_(" -version Display the compiler's version\n"));
3568 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3569 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3570 #if defined INSN_SCHEDULING
3571 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3573 printf (_(" --help Display this information\n"));
3578 /* Display descriptions of language specific options.
3579 If there is no description, note that there is an undocumented option.
3580 If the description is empty, do not display anything. (This allows
3581 options to be deliberately undocumented, for whatever reason).
3582 If the option string is missing, then this is a marker, indicating
3583 that the description string is in fact the name of a language, whose
3584 language specific options are to follow. */
3586 if (ARRAY_SIZE (documented_lang_options) > 1)
3588 printf (_("\nLanguage specific options:\n"));
3590 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3592 const char *description = documented_lang_options[i].description;
3593 const char *option = documented_lang_options[i].option;
3595 if (description == NULL)
3600 printf (_(" %-23.23s [undocumented]\n"), option);
3602 else if (*description == 0)
3604 else if (option == NULL)
3608 (_("\nThere are undocumented %s specific options as well.\n"),
3612 printf (_("\n Options for %s:\n"), description);
3617 printf (" %-23.23s %s\n", option, _(description));
3622 printf (_("\nThere are undocumented %s specific options as well.\n"),
3625 display_target_options ();
3629 display_target_options ()
3632 static bool displayed = false;
3634 /* Avoid double printing for --help --target-help. */
3639 if (ARRAY_SIZE (target_switches) > 1
3640 #ifdef TARGET_OPTIONS
3641 || ARRAY_SIZE (target_options) > 1
3649 printf (_("\nTarget specific options:\n"));
3651 for (i = ARRAY_SIZE (target_switches); i--;)
3653 const char *option = target_switches[i].name;
3654 const char *description = target_switches[i].description;
3656 if (option == NULL || *option == 0)
3658 else if (description == NULL)
3663 printf (_(" -m%-23.23s [undocumented]\n"), option);
3665 else if (* description != 0)
3666 doc += printf (" -m%-23.23s %s\n", option, _(description));
3669 #ifdef TARGET_OPTIONS
3670 for (i = ARRAY_SIZE (target_options); i--;)
3672 const char *option = target_options[i].prefix;
3673 const char *description = target_options[i].description;
3675 if (option == NULL || *option == 0)
3677 else if (description == NULL)
3682 printf (_(" -m%-23.23s [undocumented]\n"), option);
3684 else if (* description != 0)
3685 doc += printf (" -m%-23.23s %s\n", option, _(description));
3691 printf (_("\nThere are undocumented target specific options as well.\n"));
3693 printf (_(" They exist, but they are not documented.\n"));
3698 /* Parse a -d... command line switch. */
3701 decode_d_option (arg)
3710 for (i = 0; i < (int) DFI_MAX; ++i)
3711 dump_file[i].enabled = 1;
3717 flag_print_asm_name = 1;
3720 flag_dump_rtl_in_asm = 1;
3721 flag_print_asm_name = 1;
3724 graph_dump_format = vcg;
3727 rtl_dump_and_exit = 1;
3730 (*lang_hooks.set_yydebug) (1);
3732 case 'D': /* These are handled by the preprocessor. */
3738 for (i = 0; i < (int) DFI_MAX; ++i)
3739 if (c == dump_file[i].debug_switch)
3741 dump_file[i].enabled = 1;
3746 warning ("unrecognized gcc debugging option: %c", c);
3751 /* Parse a -f... command line switch. ARG is the value after the -f.
3752 It is safe to access 'ARG - 2' to generate the full switch name.
3753 Return the number of strings consumed. */
3756 decode_f_option (arg)
3760 const char *option_value = NULL;
3762 /* Search for the option in the table of binary f options. */
3763 for (j = ARRAY_SIZE (f_options); j--;)
3765 if (!strcmp (arg, f_options[j].string))
3767 *f_options[j].variable = f_options[j].on_value;
3771 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3772 && ! strcmp (arg + 3, f_options[j].string))
3774 *f_options[j].variable = ! f_options[j].on_value;
3779 if (!strcmp (arg, "fast-math"))
3780 set_fast_math_flags ();
3781 else if (!strcmp (arg, "no-fast-math"))
3782 set_no_fast_math_flags ();
3783 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3784 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3787 read_integral_parameter (option_value, arg - 2,
3789 set_param_value ("max-inline-insns", val);
3791 #ifdef INSN_SCHEDULING
3792 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3793 fix_sched_param ("verbose", option_value);
3795 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3796 fix_register (option_value, 1, 1);
3797 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3798 fix_register (option_value, 0, 1);
3799 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3800 fix_register (option_value, 0, 0);
3801 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3802 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3803 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3805 = read_integral_parameter (option_value, arg - 2, align_functions);
3806 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3807 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3808 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3810 = read_integral_parameter (option_value, arg - 2, align_labels);
3811 else if ((option_value
3812 = skip_leading_substring (arg, "stack-limit-register=")))
3814 int reg = decode_reg_name (option_value);
3816 error ("unrecognized register name `%s'", option_value);
3818 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3820 else if ((option_value
3821 = skip_leading_substring (arg, "stack-limit-symbol=")))
3824 nm = ggc_strdup (option_value);
3825 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3827 else if ((option_value
3828 = skip_leading_substring (arg, "message-length=")))
3829 output_set_maximum_length
3830 (&global_dc->buffer, read_integral_parameter
3831 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3832 else if ((option_value
3833 = skip_leading_substring (arg, "diagnostics-show-location=")))
3835 if (!strcmp (option_value, "once"))
3836 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3837 else if (!strcmp (option_value, "every-line"))
3838 diagnostic_prefixing_rule (global_dc)
3839 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3841 error ("unrecognized option `%s'", arg - 2);
3843 else if (!strcmp (arg, "no-stack-limit"))
3844 stack_limit_rtx = NULL_RTX;
3845 else if (!strcmp (arg, "preprocessed"))
3846 /* Recognise this switch but do nothing. This prevents warnings
3847 about an unrecognized switch if cpplib has not been linked in. */
3855 /* Parse a -W... command line switch. ARG is the value after the -W.
3856 It is safe to access 'ARG - 2' to generate the full switch name.
3857 Return the number of strings consumed. */
3860 decode_W_option (arg)
3863 const char *option_value = NULL;
3866 /* Search for the option in the table of binary W options. */
3868 for (j = ARRAY_SIZE (W_options); j--;)
3870 if (!strcmp (arg, W_options[j].string))
3872 *W_options[j].variable = W_options[j].on_value;
3876 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3877 && ! strcmp (arg + 3, W_options[j].string))
3879 *W_options[j].variable = ! W_options[j].on_value;
3884 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3885 warning ("-Wid-clash-LEN is no longer supported");
3886 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3888 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3890 warn_larger_than = larger_than_size != -1;
3892 else if (!strcmp (arg, "unused"))
3896 else if (!strcmp (arg, "no-unused"))
3906 /* Parse a -g... command line switch. ARG is the value after the -g.
3907 It is safe to access 'ARG - 2' to generate the full switch name.
3908 Return the number of strings consumed. */
3911 decode_g_option (arg)
3914 static unsigned level=0;
3915 /* A lot of code assumes write_symbols == NO_DEBUG if the
3916 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3917 of what debugging type has been selected). This records the
3918 selected type. It is an error to specify more than one
3920 static enum debug_info_type selected_debug_type = NO_DEBUG;
3921 /* Non-zero if debugging format has been explicitly set.
3922 -g and -ggdb don't explicitly set the debugging format so
3923 -gdwarf -g3 is equivalent to -gdwarf3. */
3924 static int type_explicitly_set_p = 0;
3925 /* Indexed by enum debug_info_type. */
3926 static const char *const debug_type_names[] =
3928 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3931 /* The maximum admissible debug level value. */
3932 static const unsigned max_debug_level = 3;
3934 /* Look up ARG in the table. */
3935 for (da = debug_args; da->arg; da++)
3937 const int da_len = strlen (da->arg);
3939 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3941 enum debug_info_type type = da->debug_type;
3942 const char *p = arg + da_len;
3944 if (*p && ! ISDIGIT (*p))
3947 /* A debug flag without a level defaults to level 2.
3948 Note we do not want to call read_integral_parameter
3949 for that case since it will call atoi which
3952 ??? We may want to generalize the interface to
3953 read_integral_parameter to better handle this case
3954 if this case shows up often. */
3956 level = read_integral_parameter (p, 0, max_debug_level + 1);
3958 level = (level == 0) ? 2 : level;
3960 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
3962 error ("use -gdwarf -g%d for DWARF v1, level %d",
3965 error ("use -gdwarf-2 for DWARF v2");
3968 if (level > max_debug_level)
3971 ignoring option `%s' due to invalid debug level specification",
3973 level = debug_info_level;
3976 if (type == NO_DEBUG)
3978 type = PREFERRED_DEBUGGING_TYPE;
3980 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
3982 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
3983 type = DWARF2_DEBUG;
3985 #ifdef DBX_DEBUGGING_INFO
3992 if (type == NO_DEBUG)
3993 warning ("`%s': unknown or unsupported -g option", arg - 2);
3995 /* Does it conflict with an already selected type? */
3996 if (type_explicitly_set_p
3997 /* -g/-ggdb don't conflict with anything. */
3998 && da->debug_type != NO_DEBUG
3999 && type != selected_debug_type)
4000 warning ("`%s' ignored, conflicts with `-g%s'",
4001 arg - 2, debug_type_names[(int) selected_debug_type]);
4004 /* If the format has already been set, -g/-ggdb
4005 only change the debug level. */
4006 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4007 /* Don't change debugging type. */
4011 selected_debug_type = type;
4012 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4015 write_symbols = (level == 0
4017 : selected_debug_type);
4018 use_gnu_debug_info_extensions = da->use_extensions_p;
4019 debug_info_level = (enum debug_info_level) level;
4032 /* Decode the first argument in the argv as a language-independent option.
4033 Return the number of strings consumed. */
4036 independent_decode_option (argc, argv)
4040 char *arg = argv[0];
4042 if (arg[0] != '-' || arg[1] == 0)
4054 if (!strcmp (arg, "-help"))
4057 exit_after_options = 1;
4060 if (!strcmp (arg, "-target-help"))
4062 display_target_options ();
4063 exit_after_options = 1;
4066 if (!strcmp (arg, "-version"))
4068 print_version (stderr, "");
4069 exit_after_options = 1;
4072 /* Handle '--param <name>=<value>'. */
4073 if (strcmp (arg, "-param") == 0)
4079 error ("-param option missing argument");
4083 /* Get the '<name>=<value>' parameter. */
4085 /* Look for the `='. */
4086 equal = strchr (arg, '=');
4088 error ("invalid --param option: %s", arg);
4093 /* Zero out the `=' sign so that we get two separate strings. */
4095 /* Figure out what value is specified. */
4096 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4097 if (val != INVALID_PARAM_VAL)
4098 set_param_value (arg, val);
4100 error ("invalid parameter value `%s'", equal + 1);
4115 /* Already been treated in main (). Do nothing. */
4119 set_target_switch (arg + 1);
4123 return decode_f_option (arg + 1);
4126 return decode_g_option (arg + 1);
4129 if (!strcmp (arg, "dumpbase"))
4134 dump_base_name = argv[1];
4138 decode_d_option (arg + 1);
4142 if (!strcmp (arg, "pedantic"))
4144 else if (!strcmp (arg, "pedantic-errors"))
4145 flag_pedantic_errors = pedantic = 1;
4146 else if (arg[1] == 0)
4153 if (!strcmp (arg, "quiet"))
4160 if (!strcmp (arg, "version"))
4168 inhibit_warnings = 1;
4177 /* We save the value of warn_uninitialized, since if they put
4178 -Wuninitialized on the command line, we need to generate a
4179 warning about not using it without also specifying -O. */
4180 if (warn_uninitialized != 1)
4181 warn_uninitialized = 2;
4184 return decode_W_option (arg + 1);
4188 if (!strncmp (arg, "aux-info", 8))
4195 aux_info_file_name = argv[1];
4196 flag_gen_aux_info = 1;
4199 else if (arg[8] == '=')
4201 aux_info_file_name = arg + 9;
4202 flag_gen_aux_info = 1;
4217 asm_file_name = argv[1];
4232 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4237 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4241 if (g_switch_val == -1)
4245 g_switch_set = TRUE;
4246 g_switch_value = g_switch_val;
4256 /* Decode -m switches. */
4257 /* Decode the switch -mNAME. */
4260 set_target_switch (name)
4264 int valid_target_option = 0;
4266 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4267 if (!strcmp (target_switches[j].name, name))
4269 if (target_switches[j].value < 0)
4270 target_flags &= ~-target_switches[j].value;
4272 target_flags |= target_switches[j].value;
4273 valid_target_option = 1;
4276 #ifdef TARGET_OPTIONS
4277 if (!valid_target_option)
4278 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4280 int len = strlen (target_options[j].prefix);
4281 if (!strncmp (target_options[j].prefix, name, len))
4283 *target_options[j].variable = name + len;
4284 valid_target_option = 1;
4289 if (!valid_target_option)
4290 error ("invalid option `%s'", name);
4293 /* Print version information to FILE.
4294 Each line begins with INDENT (for the case where FILE is the
4295 assembler output file). */
4298 print_version (file, indent)
4303 #define __VERSION__ "[?]"
4307 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4309 "%s%s%s version %s (%s) compiled by CC.\n"
4311 , indent, *indent != 0 ? " " : "",
4312 lang_hooks.name, version_string, TARGET_NAME,
4313 indent, __VERSION__);
4316 /* Print an option value and return the adjusted position in the line.
4317 ??? We don't handle error returns from fprintf (disk full); presumably
4318 other code will catch a disk full though. */
4321 print_single_switch (file, pos, max, indent, sep, term, type, name)
4324 const char *indent, *sep, *term, *type, *name;
4326 /* The ultrix fprintf returns 0 on success, so compute the result we want
4327 here since we need it for the following test. */
4328 int len = strlen (sep) + strlen (type) + strlen (name);
4333 fprintf (file, "%s", term);
4338 fprintf (file, "%s", indent);
4339 pos = strlen (indent);
4341 fprintf (file, "%s%s%s", sep, type, name);
4346 /* Print active target switches to FILE.
4347 POS is the current cursor position and MAX is the size of a "line".
4348 Each line begins with INDENT and ends with TERM.
4349 Each switch is separated from the next by SEP. */
4352 print_switch_values (file, pos, max, indent, sep, term)
4355 const char *indent, *sep, *term;
4360 /* Print the options as passed. */
4362 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4363 _("options passed: "), "");
4365 for (p = &save_argv[1]; *p != NULL; p++)
4369 if (strcmp (*p, "-o") == 0)
4375 if (strcmp (*p, "-quiet") == 0)
4377 if (strcmp (*p, "-version") == 0)
4382 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4385 fprintf (file, "%s", term);
4387 /* Print the -f and -m options that have been enabled.
4388 We don't handle language specific options but printing argv
4391 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4392 _("options enabled: "), "");
4394 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4395 if (*f_options[j].variable == f_options[j].on_value)
4396 pos = print_single_switch (file, pos, max, indent, sep, term,
4397 "-f", f_options[j].string);
4399 /* Print target specific options. */
4401 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4402 if (target_switches[j].name[0] != '\0'
4403 && target_switches[j].value > 0
4404 && ((target_switches[j].value & target_flags)
4405 == target_switches[j].value))
4407 pos = print_single_switch (file, pos, max, indent, sep, term,
4408 "-m", target_switches[j].name);
4411 #ifdef TARGET_OPTIONS
4412 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4413 if (*target_options[j].variable != NULL)
4416 sprintf (prefix, "-m%s", target_options[j].prefix);
4417 pos = print_single_switch (file, pos, max, indent, sep, term,
4418 prefix, *target_options[j].variable);
4422 fprintf (file, "%s", term);
4425 /* Open assembly code output file. Do this even if -fsyntax-only is
4426 on, because then the driver will have provided the name of a
4427 temporary file or bit bucket for us. NAME is the file specified on
4428 the command line, possibly NULL. */
4430 init_asm_output (name)
4433 if (name == NULL && asm_file_name == 0)
4434 asm_out_file = stdout;
4437 if (asm_file_name == 0)
4439 int len = strlen (dump_base_name);
4440 char *dumpname = (char *) xmalloc (len + 6);
4441 memcpy (dumpname, dump_base_name, len + 1);
4442 strip_off_ending (dumpname, len);
4443 strcat (dumpname, ".s");
4444 asm_file_name = dumpname;
4446 if (!strcmp (asm_file_name, "-"))
4447 asm_out_file = stdout;
4449 asm_out_file = fopen (asm_file_name, "w");
4450 if (asm_out_file == 0)
4451 fatal_io_error ("can't open %s for writing", asm_file_name);
4454 #ifdef IO_BUFFER_SIZE
4455 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4456 _IOFBF, IO_BUFFER_SIZE);
4459 if (!flag_syntax_only)
4461 #ifdef ASM_FILE_START
4462 ASM_FILE_START (asm_out_file);
4465 #ifdef ASM_COMMENT_START
4466 if (flag_verbose_asm)
4468 /* Print the list of options in effect. */
4469 print_version (asm_out_file, ASM_COMMENT_START);
4470 print_switch_values (asm_out_file, 0, MAX_LINE,
4471 ASM_COMMENT_START, " ", "\n");
4472 /* Add a blank line here so it appears in assembler output but not
4474 fprintf (asm_out_file, "\n");
4480 /* Initialization of the front end environment, before command line
4481 options are parsed. Signal handlers, internationalization etc.
4482 ARGV0 is main's argv[0]. */
4484 general_init (argv0)
4489 p = argv0 + strlen (argv0);
4490 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4494 xmalloc_set_program_name (progname);
4496 gcc_init_libintl ();
4498 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4500 signal (SIGSEGV, crash_signal);
4503 signal (SIGILL, crash_signal);
4506 signal (SIGBUS, crash_signal);
4509 signal (SIGABRT, crash_signal);
4511 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4512 signal (SIGIOT, crash_signal);
4515 signal (SIGFPE, crash_signal);
4518 /* Initialize the diagnostics reporting machinery, so option parsing
4519 can give warnings and errors. */
4520 diagnostic_initialize (global_dc);
4523 /* Parse command line options and set default flag values, called
4524 after language-independent option-independent initialization. Do
4525 minimal options processing. Outputting diagnostics is OK, but GC
4526 and identifier hashtables etc. are not initialized yet. */
4528 parse_options_and_default_flags (argc, argv)
4534 /* Save in case md file wants to emit args as a comment. */
4538 /* Initialize register usage now so switches may override. */
4541 /* Register the language-independent parameters. */
4542 add_params (lang_independent_params, LAST_PARAM);
4544 /* Perform language-specific options initialization. */
4545 (*lang_hooks.init_options) ();
4547 /* Scan to see what optimization level has been specified. That will
4548 determine the default value of many flags. */
4549 for (i = 1; i < argc; i++)
4551 if (!strcmp (argv[i], "-O"))
4556 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4558 /* Handle -Os, -O2, -O3, -O69, ... */
4559 char *p = &argv[i][2];
4561 if ((p[0] == 's') && (p[1] == 0))
4565 /* Optimizing for size forces optimize to be 2. */
4570 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4571 if (optimize_val != -1)
4573 optimize = optimize_val;
4582 flag_merge_constants = 0;
4588 flag_thread_jumps = 1;
4590 flag_delayed_branch = 1;
4592 #ifdef CAN_DEBUG_WITHOUT_FP
4593 flag_omit_frame_pointer = 1;
4595 flag_guess_branch_prob = 1;
4596 flag_cprop_registers = 1;
4597 flag_loop_optimize = 1;
4598 flag_crossjumping = 1;
4603 flag_optimize_sibling_calls = 1;
4604 flag_cse_follow_jumps = 1;
4605 flag_cse_skip_blocks = 1;
4607 flag_expensive_optimizations = 1;
4608 flag_strength_reduce = 1;
4609 flag_rerun_cse_after_loop = 1;
4610 flag_rerun_loop_opt = 1;
4611 flag_caller_saves = 1;
4614 #ifdef INSN_SCHEDULING
4615 flag_schedule_insns = 1;
4616 flag_schedule_insns_after_reload = 1;
4619 flag_strict_aliasing = 1;
4620 flag_delete_null_pointer_checks = 1;
4621 flag_reorder_blocks = 1;
4626 flag_inline_functions = 1;
4627 flag_rename_registers = 1;
4630 if (optimize < 2 || optimize_size)
4635 align_functions = 1;
4638 /* Initialize whether `char' is signed. */
4639 flag_signed_char = DEFAULT_SIGNED_CHAR;
4640 #ifdef DEFAULT_SHORT_ENUMS
4641 /* Initialize how much space enums occupy, by default. */
4642 flag_short_enums = DEFAULT_SHORT_ENUMS;
4645 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4648 set_target_switch ("");
4650 /* Unwind tables are always present in an ABI-conformant IA-64
4651 object file, so the default should be ON. */
4652 #ifdef IA64_UNWIND_INFO
4653 flag_unwind_tables = IA64_UNWIND_INFO;
4656 #ifdef OPTIMIZATION_OPTIONS
4657 /* Allow default optimizations to be specified on a per-machine basis. */
4658 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4661 /* Perform normal command line switch decoding. */
4662 for (i = 1; i < argc;)
4665 int indep_processed;
4667 /* Give the language a chance to decode the option for itself. */
4668 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4670 if (lang_processed >= 0)
4671 /* Now see if the option also has a language independent meaning.
4672 Some options are both language specific and language independent,
4674 indep_processed = independent_decode_option (argc - i, argv + i);
4677 lang_processed = -lang_processed;
4678 indep_processed = 0;
4681 if (lang_processed || indep_processed)
4682 i += MAX (lang_processed, indep_processed);
4685 const char *option = NULL;
4686 const char *lang = NULL;
4689 /* It is possible that the command line switch is not valid for the
4690 current language, but it is valid for another language. In order
4691 to be compatible with previous versions of the compiler (which
4692 did not issue an error message in this case) we check for this
4693 possibility here. If we do find a match, then if extra_warnings
4694 is set we generate a warning message, otherwise we will just
4695 ignore the option. */
4696 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4698 option = documented_lang_options[j].option;
4701 lang = documented_lang_options[j].description;
4702 else if (! strncmp (argv[i], option, strlen (option)))
4706 if (j != ARRAY_SIZE (documented_lang_options))
4710 warning ("ignoring command line option '%s'", argv[i]);
4713 ("(it is valid for %s but not the selected language)",
4717 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4718 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4720 error ("unrecognized option `%s'", argv[i]);
4726 /* Set flag_no_inline before the post_options () hook. The C front
4727 ends use it to determine tree inlining defaults. FIXME: such
4728 code should be lang-independent when all front ends use tree
4729 inlining, in which case it, and this condition, should be moved
4730 to the top of process_options() instead. */
4733 /* Inlining does not work if not optimizing,
4734 so force it not to be done. */
4738 /* The c_decode_option function and decode_option hook set
4739 this to `2' if -Wall is used, so we can avoid giving out
4740 lots of errors for people who don't realize what -Wall does. */
4741 if (warn_uninitialized == 1)
4742 warning ("-Wuninitialized is not supported without -O");
4745 /* All command line options have been parsed; allow the front end to
4746 perform consistency checks, etc. */
4747 (*lang_hooks.post_options) ();
4750 /* Process the options that have been parsed. */
4754 #ifdef OVERRIDE_OPTIONS
4755 /* Some machines may reject certain combinations of options. */
4759 /* Set up the align_*_log variables, defaulting them to 1 if they
4760 were still unset. */
4761 if (align_loops <= 0) align_loops = 1;
4762 if (align_loops_max_skip > align_loops || !align_loops)
4763 align_loops_max_skip = align_loops - 1;
4764 align_loops_log = floor_log2 (align_loops * 2 - 1);
4765 if (align_jumps <= 0) align_jumps = 1;
4766 if (align_jumps_max_skip > align_jumps || !align_jumps)
4767 align_jumps_max_skip = align_jumps - 1;
4768 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4769 if (align_labels <= 0) align_labels = 1;
4770 align_labels_log = floor_log2 (align_labels * 2 - 1);
4771 if (align_labels_max_skip > align_labels || !align_labels)
4772 align_labels_max_skip = align_labels - 1;
4773 if (align_functions <= 0) align_functions = 1;
4774 align_functions_log = floor_log2 (align_functions * 2 - 1);
4776 /* Unrolling all loops implies that standard loop unrolling must also
4778 if (flag_unroll_all_loops)
4779 flag_unroll_loops = 1;
4780 /* Loop unrolling requires that strength_reduction be on also. Silently
4781 turn on strength reduction here if it isn't already on. Also, the loop
4782 unrolling code assumes that cse will be run after loop, so that must
4783 be turned on also. */
4784 if (flag_unroll_loops)
4786 flag_strength_reduce = 1;
4787 flag_rerun_cse_after_loop = 1;
4790 if (flag_non_call_exceptions)
4791 flag_asynchronous_unwind_tables = 1;
4792 if (flag_asynchronous_unwind_tables)
4793 flag_unwind_tables = 1;
4795 /* Warn about options that are not supported on this machine. */
4796 #ifndef INSN_SCHEDULING
4797 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4798 warning ("instruction scheduling not supported on this target machine");
4801 if (flag_delayed_branch)
4802 warning ("this target machine does not have delayed branches");
4805 /* Some operating systems do not allow profiling without a frame
4807 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4809 && flag_omit_frame_pointer)
4811 error ("profiling does not work without a frame pointer");
4812 flag_omit_frame_pointer = 0;
4815 user_label_prefix = USER_LABEL_PREFIX;
4816 if (flag_leading_underscore != -1)
4818 /* If the default prefix is more complicated than "" or "_",
4819 issue a warning and ignore this option. */
4820 if (user_label_prefix[0] == 0 ||
4821 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4823 user_label_prefix = flag_leading_underscore ? "_" : "";
4826 warning ("-f%sleading-underscore not supported on this target machine",
4827 flag_leading_underscore ? "" : "no-");
4830 /* If we are in verbose mode, write out the version and maybe all the
4831 option flags in use. */
4834 print_version (stderr, "");
4836 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4842 if (flag_syntax_only)
4844 write_symbols = NO_DEBUG;
4848 /* Now we know write_symbols, set up the debug hooks based on it.
4849 By default we do nothing for debug output. */
4850 #if defined(DBX_DEBUGGING_INFO)
4851 if (write_symbols == DBX_DEBUG)
4852 debug_hooks = &dbx_debug_hooks;
4854 #if defined(XCOFF_DEBUGGING_INFO)
4855 if (write_symbols == XCOFF_DEBUG)
4856 debug_hooks = &xcoff_debug_hooks;
4858 #ifdef SDB_DEBUGGING_INFO
4859 if (write_symbols == SDB_DEBUG)
4860 debug_hooks = &sdb_debug_hooks;
4862 #ifdef DWARF_DEBUGGING_INFO
4863 if (write_symbols == DWARF_DEBUG)
4864 debug_hooks = &dwarf_debug_hooks;
4866 #ifdef DWARF2_DEBUGGING_INFO
4867 if (write_symbols == DWARF2_DEBUG)
4868 debug_hooks = &dwarf2_debug_hooks;
4870 #ifdef VMS_DEBUGGING_INFO
4871 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4872 debug_hooks = &vmsdbg_debug_hooks;
4875 /* If auxiliary info generation is desired, open the output file.
4876 This goes in the same directory as the source file--unlike
4877 all the other output files. */
4878 if (flag_gen_aux_info)
4880 aux_info_file = fopen (aux_info_file_name, "w");
4881 if (aux_info_file == 0)
4882 fatal_io_error ("can't open %s", aux_info_file_name);
4885 if (! targetm.have_named_sections)
4887 if (flag_function_sections)
4889 warning ("-ffunction-sections not supported for this target");
4890 flag_function_sections = 0;
4892 if (flag_data_sections)
4894 warning ("-fdata-sections not supported for this target");
4895 flag_data_sections = 0;
4899 if (flag_function_sections && profile_flag)
4901 warning ("-ffunction-sections disabled; it makes profiling impossible");
4902 flag_function_sections = 0;
4905 #ifndef HAVE_prefetch
4906 if (flag_prefetch_loop_arrays)
4908 warning ("-fprefetch-loop-arrays not supported for this target");
4909 flag_prefetch_loop_arrays = 0;
4912 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4914 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4915 flag_prefetch_loop_arrays = 0;
4919 /* This combination of options isn't handled for i386 targets and doesn't
4920 make much sense anyway, so don't allow it. */
4921 if (flag_prefetch_loop_arrays && optimize_size)
4923 warning ("-fprefetch-loop-arrays is not supported with -Os");
4924 flag_prefetch_loop_arrays = 0;
4927 #ifndef OBJECT_FORMAT_ELF
4928 if (flag_function_sections && write_symbols != NO_DEBUG)
4929 warning ("-ffunction-sections may affect debugging on some targets");
4933 /* Language-independent initialization, before language-dependent
4936 lang_independent_init ()
4938 lang_expand_expr = (lang_expand_expr_t) do_abort;
4940 /* Initialize the garbage-collector, and string pools. */
4942 ggc_add_rtx_root (&stack_limit_rtx, 1);
4943 ggc_add_tree_root (¤t_function_decl, 1);
4944 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4949 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4950 || debug_info_level == DINFO_LEVEL_VERBOSE
4951 #ifdef VMS_DEBUGGING_INFO
4952 /* Enable line number info for traceback */
4953 || debug_info_level > DINFO_LEVEL_NONE
4955 || flag_test_coverage
4956 || warn_notreached);
4962 init_function_once ();
4963 init_stor_layout_once ();
4964 init_varasm_once ();
4965 init_EXPR_INSN_LIST_cache ();
4967 /* The following initialization functions need to generate rtl, so
4968 provide a dummy function context for them. */
4969 init_dummy_function_start ();
4972 if (flag_caller_saves)
4973 init_caller_save ();
4974 expand_dummy_function_end ();
4977 /* Language-dependent initialization. Returns non-zero on success. */
4979 lang_dependent_init (name)
4982 if (dump_base_name == 0)
4983 dump_base_name = name ? name : "gccdump";
4985 /* Front-end initialization. This hook can assume that GC,
4986 identifier hashes etc. are set up, but debug initialization is
4987 not done yet. This routine must return the original filename
4988 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
4989 name = (*lang_hooks.init) (name);
4993 /* Is this duplication necessary? */
4994 name = ggc_strdup (name);
4995 main_input_filename = input_filename = name;
4996 init_asm_output (name);
4998 /* These create various _DECL nodes, so need to be called after the
4999 front end is initialized. */
5003 /* Put an entry on the input file stack for the main input file. */
5004 push_srcloc (input_filename, 0);
5006 /* If dbx symbol table desired, initialize writing it and output the
5007 predefined types. */
5008 timevar_push (TV_SYMOUT);
5010 #ifdef DWARF2_UNWIND_INFO
5011 if (dwarf2out_do_frame ())
5012 dwarf2out_frame_init ();
5015 /* Now we have the correct original filename, we can initialize
5017 (*debug_hooks->init) (name);
5019 timevar_pop (TV_SYMOUT);
5024 /* Clean up: close opened files, etc. */
5029 /* Close the dump files. */
5030 if (flag_gen_aux_info)
5032 fclose (aux_info_file);
5034 unlink (aux_info_file_name);
5037 /* Close non-debugging input and output files. Take special care to note
5038 whether fclose returns an error, since the pages might still be on the
5039 buffer chain while the file is open. */
5043 if (ferror (asm_out_file) != 0)
5044 fatal_io_error ("error writing to %s", asm_file_name);
5045 if (fclose (asm_out_file) != 0)
5046 fatal_io_error ("error closing %s", asm_file_name);
5049 /* Do whatever is necessary to finish printing the graphs. */
5050 if (graph_dump_format != no_graph)
5054 for (i = 0; i < (int) DFI_MAX; ++i)
5055 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5060 sprintf (seq, DUMPFILE_FORMAT, i);
5061 suffix = concat (seq, dump_file[i].extension, NULL);
5062 finish_graph_dump_file (dump_base_name, suffix);
5069 ggc_print_statistics ();
5070 stringpool_statistics ();
5071 dump_tree_statistics ();
5074 /* Free up memory for the benefit of leak detectors. */
5077 /* Language-specific end of compilation actions. */
5078 (*lang_hooks.finish) ();
5081 /* Initialize the compiler, and compile the input file. */
5085 /* The bulk of command line switch processing. */
5088 /* We cannot start timing until after options are processed since that
5089 says if we run timers or not. */
5091 timevar_start (TV_TOTAL);
5093 /* Language-independent initialization. Also sets up GC, identifier
5095 lang_independent_init ();
5097 /* Language-dependent initialization. Returns true on success. */
5098 if (lang_dependent_init (filename))
5103 /* Stop timing and print the times. */
5104 timevar_stop (TV_TOTAL);
5105 timevar_print (stderr);
5108 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5109 Decode command args, then call compile_file.
5110 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5111 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5113 It is not safe to call this function more than once. */
5116 toplev_main (argc, argv)
5122 /* Initialization of GCC's environment, and diagnostics. */
5123 general_init (argv [0]);
5125 /* Parse the options and do minimal processing; basically just
5126 enough to default flags appropriately. */
5127 parse_options_and_default_flags (argc, argv);
5129 /* Exit early if we can (e.g. -help). */
5130 if (!exit_after_options)
5133 if (errorcount || sorrycount)
5134 return (FATAL_EXIT_CODE);
5136 return (SUCCESS_EXIT_CODE);