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 /* Warn if a switch on an enum fails to have a case for every enum
1405 value (regardless of the presence or otherwise of a default case). */
1407 int warn_switch_enum;
1409 /* Nonzero means warn about function definitions that default the return type
1410 or that use a null return and have a return-type other than void. */
1412 int warn_return_type;
1414 /* Nonzero means warn about pointer casts that increase the required
1415 alignment of the target type (and might therefore lead to a crash
1416 due to a misaligned access). */
1418 int warn_cast_align;
1420 /* Nonzero means warn about any objects definitions whose size is larger
1421 than N bytes. Also want about function definitions whose returned
1422 values are larger than N bytes. The value N is in `larger_than_size'. */
1424 int warn_larger_than;
1425 HOST_WIDE_INT larger_than_size;
1427 /* Nonzero means warn if inline function is too large. */
1431 /* Warn if a function returns an aggregate,
1432 since there are often incompatible calling conventions for doing this. */
1434 int warn_aggregate_return;
1436 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1440 /* Warn when gcc pads a structure to an alignment boundary. */
1444 /* Warn when an optimization pass is disabled. */
1446 int warn_disabled_optimization;
1448 /* Warn about functions which might be candidates for attribute noreturn. */
1450 int warn_missing_noreturn;
1452 /* Nonzero means warn about uses of __attribute__((deprecated))
1455 int warn_deprecated_decl = 1;
1457 /* Likewise for -W. */
1459 static const lang_independent_options W_options[] =
1461 {"unused-function", &warn_unused_function, 1,
1462 N_("Warn when a function is unused") },
1463 {"unused-label", &warn_unused_label, 1,
1464 N_("Warn when a label is unused") },
1465 {"unused-parameter", &warn_unused_parameter, 1,
1466 N_("Warn when a function parameter is unused") },
1467 {"unused-variable", &warn_unused_variable, 1,
1468 N_("Warn when a variable is unused") },
1469 {"unused-value", &warn_unused_value, 1,
1470 N_("Warn when an expression value is unused") },
1471 {"system-headers", &warn_system_headers, 1,
1472 N_("Do not suppress warnings from system headers") },
1473 {"error", &warnings_are_errors, 1,
1474 N_("Treat all warnings as errors") },
1475 {"shadow", &warn_shadow, 1,
1476 N_("Warn when one local variable shadows another") },
1477 {"switch", &warn_switch, 1,
1478 N_("Warn about enumerated switches, with no default, missing a case") },
1479 {"switch-default", &warn_switch_default, 1,
1480 N_("Warn about enumerated switches missing a default case") },
1481 {"switch-enum", &warn_switch_enum, 1,
1482 N_("Warn about all enumerated switches missing a specific case") },
1483 {"aggregate-return", &warn_aggregate_return, 1,
1484 N_("Warn about returning structures, unions or arrays") },
1485 {"cast-align", &warn_cast_align, 1,
1486 N_("Warn about pointer casts which increase alignment") },
1487 {"unreachable-code", &warn_notreached, 1,
1488 N_("Warn about code that will never be executed") },
1489 {"uninitialized", &warn_uninitialized, 1,
1490 N_("Warn about uninitialized automatic variables") },
1491 {"inline", &warn_inline, 1,
1492 N_("Warn when an inlined function cannot be inlined") },
1493 {"packed", &warn_packed, 1,
1494 N_("Warn when the packed attribute has no effect on struct layout") },
1495 {"padded", &warn_padded, 1,
1496 N_("Warn when padding is required to align struct members") },
1497 {"disabled-optimization", &warn_disabled_optimization, 1,
1498 N_("Warn when an optimization pass is disabled") },
1499 {"deprecated-declarations", &warn_deprecated_decl, 1,
1500 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1501 {"missing-noreturn", &warn_missing_noreturn, 1,
1502 N_("Warn about functions which might be candidates for attribute noreturn") }
1506 set_Wunused (setting)
1509 warn_unused_function = setting;
1510 warn_unused_label = setting;
1511 /* Unused function parameter warnings are reported when either ``-W
1512 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1513 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1515 warn_unused_parameter = 0;
1516 else if (!warn_unused_parameter)
1517 warn_unused_parameter = -1;
1518 warn_unused_variable = setting;
1519 warn_unused_value = setting;
1522 /* The following routines are useful in setting all the flags that
1523 -ffast-math and -fno-fast-math imply. */
1526 set_fast_math_flags ()
1528 flag_trapping_math = 0;
1529 flag_unsafe_math_optimizations = 1;
1530 flag_errno_math = 0;
1534 set_no_fast_math_flags ()
1536 flag_trapping_math = 1;
1537 flag_unsafe_math_optimizations = 0;
1538 flag_errno_math = 1;
1542 /* Output files for assembler code (real compiler output)
1543 and debugging dumps. */
1546 FILE *aux_info_file;
1547 FILE *rtl_dump_file = NULL;
1549 /* Decode the string P as an integral parameter.
1550 If the string is indeed an integer return its numeric value else
1551 issue an Invalid Option error for the option PNAME and return DEFVAL.
1552 If PNAME is zero just return DEFVAL, do not call error. */
1555 read_integral_parameter (p, pname, defval)
1560 const char *endp = p;
1564 if (ISDIGIT (*endp))
1573 error ("invalid option `%s'", pname);
1580 /* This calls abort and is used to avoid problems when abort if a macro.
1581 It is used when we need to pass the address of abort. */
1589 /* When `malloc.c' is compiled with `rcheck' defined,
1590 it calls this function to report clobberage. */
1594 const char *s ATTRIBUTE_UNUSED;
1599 /* Return the logarithm of X, base 2, considering X unsigned,
1600 if X is a power of 2. Otherwise, returns -1.
1602 This should be used via the `exact_log2' macro. */
1606 unsigned HOST_WIDE_INT x;
1609 /* Test for 0 or a power of 2. */
1610 if (x == 0 || x != (x & -x))
1612 while ((x >>= 1) != 0)
1617 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1618 If X is 0, return -1.
1620 This should be used via the floor_log2 macro. */
1624 unsigned HOST_WIDE_INT x;
1633 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1634 into ICE messages, which is much more user friendly. */
1637 crash_signal (signo)
1640 internal_error ("internal error: %s", strsignal (signo));
1643 /* Strip off a legitimate source ending from the input string NAME of
1644 length LEN. Rather than having to know the names used by all of
1645 our front ends, we strip off an ending of a period followed by
1646 up to five characters. (Java uses ".class".) */
1649 strip_off_ending (name, len)
1654 for (i = 2; i < 6 && len > i; i++)
1656 if (name[len - i] == '.')
1658 name[len - i] = '\0';
1664 /* Output a quoted string. */
1667 output_quoted_string (asm_file, string)
1671 #ifdef OUTPUT_QUOTED_STRING
1672 OUTPUT_QUOTED_STRING (asm_file, string);
1676 putc ('\"', asm_file);
1677 while ((c = *string++) != 0)
1681 if (c == '\"' || c == '\\')
1682 putc ('\\', asm_file);
1686 fprintf (asm_file, "\\%03o", c);
1688 putc ('\"', asm_file);
1692 /* Output a file name in the form wanted by System V. */
1695 output_file_directive (asm_file, input_name)
1697 const char *input_name;
1699 int len = strlen (input_name);
1700 const char *na = input_name + len;
1702 /* NA gets INPUT_NAME sans directory names. */
1703 while (na > input_name)
1705 if (IS_DIR_SEPARATOR (na[-1]))
1710 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1711 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1713 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1714 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1716 fprintf (asm_file, "\t.file\t");
1717 output_quoted_string (asm_file, na);
1718 fputc ('\n', asm_file);
1723 /* Routine to open a dump file. Return true if the dump file is enabled. */
1726 open_dump_file (index, decl)
1727 enum dump_file_index index;
1731 const char *open_arg;
1734 if (! dump_file[index].enabled)
1737 timevar_push (TV_DUMP);
1738 if (rtl_dump_file != NULL)
1739 fclose (rtl_dump_file);
1741 sprintf (seq, DUMPFILE_FORMAT, index);
1743 if (! dump_file[index].initialized)
1745 /* If we've not initialized the files, do so now. */
1746 if (graph_dump_format != no_graph
1747 && dump_file[index].graph_dump_p)
1749 dump_name = concat (seq, dump_file[index].extension, NULL);
1750 clean_graph_dump_file (dump_base_name, dump_name);
1753 dump_file[index].initialized = 1;
1759 dump_name = concat (dump_base_name, seq,
1760 dump_file[index].extension, NULL);
1762 rtl_dump_file = fopen (dump_name, open_arg);
1763 if (rtl_dump_file == NULL)
1764 fatal_io_error ("can't open %s", dump_name);
1769 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1770 (*lang_hooks.decl_printable_name) (decl, 2));
1772 timevar_pop (TV_DUMP);
1776 /* Routine to close a dump file. */
1779 close_dump_file (index, func, insns)
1780 enum dump_file_index index;
1781 void (*func) PARAMS ((FILE *, rtx));
1784 if (! rtl_dump_file)
1787 timevar_push (TV_DUMP);
1789 && graph_dump_format != no_graph
1790 && dump_file[index].graph_dump_p)
1795 sprintf (seq, DUMPFILE_FORMAT, index);
1796 suffix = concat (seq, dump_file[index].extension, NULL);
1797 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1802 func (rtl_dump_file, insns);
1804 fflush (rtl_dump_file);
1805 fclose (rtl_dump_file);
1807 rtl_dump_file = NULL;
1808 timevar_pop (TV_DUMP);
1811 /* Do any final processing required for the declarations in VEC, of
1812 which there are LEN. We write out inline functions and variables
1813 that have been deferred until this point, but which are required.
1814 Returns non-zero if anything was put out. */
1817 wrapup_global_declarations (vec, len)
1824 int output_something = 0;
1826 for (i = 0; i < len; i++)
1830 /* We're not deferring this any longer. */
1831 DECL_DEFER_OUTPUT (decl) = 0;
1833 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1834 && incomplete_decl_finalize_hook != 0)
1835 (*incomplete_decl_finalize_hook) (decl);
1838 /* Now emit any global variables or functions that we have been
1839 putting off. We need to loop in case one of the things emitted
1840 here references another one which comes earlier in the list. */
1844 for (i = 0; i < len; i++)
1848 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1851 /* Don't write out static consts, unless we still need them.
1853 We also keep static consts if not optimizing (for debugging),
1854 unless the user specified -fno-keep-static-consts.
1855 ??? They might be better written into the debug information.
1856 This is possible when using DWARF.
1858 A language processor that wants static constants to be always
1859 written out (even if it is not used) is responsible for
1860 calling rest_of_decl_compilation itself. E.g. the C front-end
1861 calls rest_of_decl_compilation from finish_decl.
1862 One motivation for this is that is conventional in some
1863 environments to write things like:
1864 static const char rcsid[] = "... version string ...";
1865 intending to force the string to be in the executable.
1867 A language processor that would prefer to have unneeded
1868 static constants "optimized away" would just defer writing
1869 them out until here. E.g. C++ does this, because static
1870 constants are often defined in header files.
1872 ??? A tempting alternative (for both C and C++) would be
1873 to force a constant to be written if and only if it is
1874 defined in a main file, as opposed to an include file. */
1876 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1880 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1882 else if (DECL_COMDAT (decl))
1884 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1885 && (optimize || !flag_keep_static_consts
1886 || DECL_ARTIFICIAL (decl)))
1892 rest_of_decl_compilation (decl, NULL, 1, 1);
1896 if (TREE_CODE (decl) == FUNCTION_DECL
1897 && DECL_INITIAL (decl) != 0
1898 && DECL_SAVED_INSNS (decl) != 0
1899 && (flag_keep_inline_functions
1900 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1901 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1904 output_inline_function (decl);
1909 output_something = 1;
1913 return output_something;
1916 /* Issue appropriate warnings for the global declarations in VEC (of
1917 which there are LEN). Output debugging information for them. */
1920 check_global_declarations (vec, len)
1927 for (i = 0; i < len; i++)
1931 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1932 && ! TREE_ASM_WRITTEN (decl))
1933 /* Cancel the RTL for this decl so that, if debugging info
1934 output for global variables is still to come,
1935 this one will be omitted. */
1936 SET_DECL_RTL (decl, NULL_RTX);
1938 /* Warn about any function
1939 declared static but not defined.
1940 We don't warn about variables,
1941 because many programs have static variables
1942 that exist only to get some text into the object file. */
1943 if (TREE_CODE (decl) == FUNCTION_DECL
1944 && (warn_unused_function
1945 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1946 && DECL_INITIAL (decl) == 0
1947 && DECL_EXTERNAL (decl)
1948 && ! DECL_ARTIFICIAL (decl)
1949 && ! TREE_PUBLIC (decl))
1951 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1952 pedwarn_with_decl (decl,
1953 "`%s' used but never defined");
1955 warning_with_decl (decl,
1956 "`%s' declared `static' but never defined");
1957 /* This symbol is effectively an "extern" declaration now. */
1958 TREE_PUBLIC (decl) = 1;
1959 assemble_external (decl);
1962 /* Warn about static fns or vars defined but not used,
1963 but not about inline functions or static consts
1964 since defining those in header files is normal practice. */
1965 if (((warn_unused_function
1966 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
1967 || (warn_unused_variable
1968 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1969 && ! DECL_IN_SYSTEM_HEADER (decl)
1970 && ! DECL_EXTERNAL (decl)
1971 && ! TREE_PUBLIC (decl)
1972 && ! TREE_USED (decl)
1973 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
1974 /* The TREE_USED bit for file-scope decls
1975 is kept in the identifier, to handle multiple
1976 external decls in different scopes. */
1977 && ! TREE_USED (DECL_NAME (decl)))
1978 warning_with_decl (decl, "`%s' defined but not used");
1980 timevar_push (TV_SYMOUT);
1981 (*debug_hooks->global_decl) (decl);
1982 timevar_pop (TV_SYMOUT);
1986 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
1987 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1988 INPUT_FILENAME and LINENO accordingly. */
1991 push_srcloc (file, line)
1995 struct file_stack *fs;
1997 if (input_file_stack)
1999 input_file_stack->name = input_filename;
2000 input_file_stack->line = lineno;
2003 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2004 fs->name = input_filename = file;
2005 fs->line = lineno = line;
2006 fs->indent_level = 0;
2007 fs->next = input_file_stack;
2008 input_file_stack = fs;
2009 input_file_stack_tick++;
2012 /* Pop the top entry off the stack of presently open source files.
2013 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2019 struct file_stack *fs;
2021 fs = input_file_stack;
2022 input_file_stack = fs->next;
2024 input_file_stack_tick++;
2025 /* The initial source file is never popped. */
2026 if (!input_file_stack)
2028 input_filename = input_file_stack->name;
2029 lineno = input_file_stack->line;
2032 /* Compile an entire translation unit. Write a file of assembly
2033 output and various debugging dumps. */
2040 /* Initialize yet another pass. */
2042 init_final (main_input_filename);
2043 init_branch_prob (dump_base_name);
2045 timevar_push (TV_PARSE);
2047 /* Call the parser, which parses the entire file (calling
2048 rest_of_compilation for each function). */
2049 (*lang_hooks.parse_file) ();
2051 /* In case there were missing block closers,
2052 get us back to the global binding level. */
2053 (*lang_hooks.clear_binding_stack) ();
2055 /* Compilation is now finished except for writing
2056 what's left of the symbol table output. */
2057 timevar_pop (TV_PARSE);
2059 if (flag_syntax_only)
2062 globals = (*lang_hooks.decls.getdecls) ();
2064 /* Really define vars that have had only a tentative definition.
2065 Really output inline functions that must actually be callable
2066 and have not been output so far. */
2069 int len = list_length (globals);
2070 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2074 /* Process the decls in reverse order--earliest first.
2075 Put them into VEC from back to front, then take out from front. */
2077 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2078 vec[len - i - 1] = decl;
2080 wrapup_global_declarations (vec, len);
2082 /* This must occur after the loop to output deferred functions. Else
2083 the profiler initializer would not be emitted if all the functions
2084 in this compilation unit were deferred.
2086 output_func_start_profiler can not cause any additional functions or
2087 data to need to be output, so it need not be in the deferred function
2089 output_func_start_profiler ();
2091 check_global_declarations (vec, len);
2097 /* Write out any pending weak symbol declarations. */
2101 /* Do dbx symbols. */
2102 timevar_push (TV_SYMOUT);
2104 #ifdef DWARF2_UNWIND_INFO
2105 if (dwarf2out_do_frame ())
2106 dwarf2out_frame_finish ();
2109 (*debug_hooks->finish) (main_input_filename);
2110 timevar_pop (TV_SYMOUT);
2112 /* Output some stuff at end of file if nec. */
2114 dw2_output_indirect_constants ();
2116 end_final (dump_base_name);
2118 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2120 timevar_push (TV_DUMP);
2121 open_dump_file (DFI_bp, NULL);
2125 close_dump_file (DFI_bp, NULL, NULL_RTX);
2126 timevar_pop (TV_DUMP);
2130 ASM_FILE_END (asm_out_file);
2133 /* Attach a special .ident directive to the end of the file to identify
2134 the version of GCC which compiled this code. The format of the .ident
2135 string is patterned after the ones produced by native SVR4 compilers. */
2138 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2139 IDENT_ASM_OP, version_string);
2142 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2144 timevar_push (TV_DUMP);
2145 dump_combine_total_stats (rtl_dump_file);
2146 close_dump_file (DFI_combine, NULL, NULL_RTX);
2147 timevar_pop (TV_DUMP);
2151 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2152 and TYPE_DECL nodes.
2154 This does nothing for local (non-static) variables, unless the
2155 variable is a register variable with an ASMSPEC. In that case, or
2156 if the variable is not an automatic, it sets up the RTL and
2157 outputs any assembler code (label definition, storage allocation
2158 and initialization).
2160 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2161 the assembler symbol name to be used. TOP_LEVEL is nonzero
2162 if this declaration is not within a function. */
2165 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2167 const char *asmspec;
2171 /* Declarations of variables, and of functions defined elsewhere. */
2173 /* The most obvious approach, to put an #ifndef around where
2174 this macro is used, doesn't work since it's inside a macro call. */
2175 #ifndef ASM_FINISH_DECLARE_OBJECT
2176 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2179 /* We deferred calling assemble_alias so that we could collect
2180 other attributes such as visibility. Emit the alias now. */
2183 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2186 alias = TREE_VALUE (TREE_VALUE (alias));
2187 alias = get_identifier (TREE_STRING_POINTER (alias));
2188 assemble_alias (decl, alias);
2192 /* Forward declarations for nested functions are not "external",
2193 but we need to treat them as if they were. */
2194 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2195 || TREE_CODE (decl) == FUNCTION_DECL)
2197 timevar_push (TV_VARCONST);
2200 make_decl_rtl (decl, asmspec);
2202 /* Don't output anything when a tentative file-scope definition
2203 is seen. But at end of compilation, do output code for them. */
2204 if (at_end || !DECL_DEFER_OUTPUT (decl))
2205 assemble_variable (decl, top_level, at_end, 0);
2206 if (decl == last_assemble_variable_decl)
2208 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2212 timevar_pop (TV_VARCONST);
2214 else if (DECL_REGISTER (decl) && asmspec != 0)
2216 if (decode_reg_name (asmspec) >= 0)
2218 SET_DECL_RTL (decl, NULL_RTX);
2219 make_decl_rtl (decl, asmspec);
2223 error ("invalid register name `%s' for register variable", asmspec);
2224 DECL_REGISTER (decl) = 0;
2229 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2230 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2231 && TREE_CODE (decl) == TYPE_DECL)
2233 timevar_push (TV_SYMOUT);
2234 dbxout_symbol (decl, 0);
2235 timevar_pop (TV_SYMOUT);
2238 #ifdef SDB_DEBUGGING_INFO
2239 else if (write_symbols == SDB_DEBUG && top_level
2240 && TREE_CODE (decl) == TYPE_DECL)
2242 timevar_push (TV_SYMOUT);
2243 sdbout_symbol (decl, 0);
2244 timevar_pop (TV_SYMOUT);
2249 /* Called after finishing a record, union or enumeral type. */
2252 rest_of_type_compilation (type, toplev)
2253 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2257 tree type ATTRIBUTE_UNUSED;
2258 int toplev ATTRIBUTE_UNUSED;
2261 timevar_push (TV_SYMOUT);
2262 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2263 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2264 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2266 #ifdef SDB_DEBUGGING_INFO
2267 if (write_symbols == SDB_DEBUG)
2268 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2270 #ifdef DWARF2_DEBUGGING_INFO
2271 if ((write_symbols == DWARF2_DEBUG
2272 || write_symbols == VMS_AND_DWARF2_DEBUG)
2274 dwarf2out_decl (TYPE_STUB_DECL (type));
2276 timevar_pop (TV_SYMOUT);
2279 /* This is called from finish_function (within langhooks.parse_file)
2280 after each top-level definition is parsed.
2281 It is supposed to compile that function or variable
2282 and output the assembler code for it.
2283 After we return, the tree storage is freed. */
2286 rest_of_compilation (decl)
2292 int rebuild_label_notes_after_reload;
2293 int register_life_up_to_date;
2295 timevar_push (TV_REST_OF_COMPILATION);
2297 /* Now that we're out of the frontend, we shouldn't have any more
2298 CONCATs anywhere. */
2299 generating_concat_p = 0;
2301 /* When processing delayed functions, prepare_function_start() won't
2302 have been run to re-initialize it. */
2303 cse_not_expected = ! optimize;
2305 /* First, make sure that NOTE_BLOCK is set correctly for each
2306 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2307 if (!cfun->x_whole_function_mode_p)
2310 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2311 tree in sensible shape. So, we just recalculate it here. */
2312 if (cfun->x_whole_function_mode_p)
2317 /* If we are reconsidering an inline function
2318 at the end of compilation, skip the stuff for making it inline. */
2320 if (DECL_SAVED_INSNS (decl) == 0)
2326 /* If this is nested inside an inlined external function, pretend
2327 it was only declared. Since we cannot inline such functions,
2328 generating code for this one is not only not necessary but will
2329 confuse some debugging output writers. */
2330 for (parent = DECL_CONTEXT (current_function_decl);
2331 parent != NULL_TREE;
2332 parent = get_containing_scope (parent))
2333 if (TREE_CODE (parent) == FUNCTION_DECL
2334 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2336 DECL_INITIAL (decl) = 0;
2337 goto exit_rest_of_compilation;
2340 /* If requested, consider whether to make this function inline. */
2341 if ((DECL_INLINE (decl) && !flag_no_inline)
2342 || flag_inline_functions)
2344 timevar_push (TV_INTEGRATION);
2345 lose = function_cannot_inline_p (decl);
2346 timevar_pop (TV_INTEGRATION);
2347 if (lose || ! optimize)
2349 if (warn_inline && DECL_INLINE (decl))
2350 warning_with_decl (decl, lose);
2351 DECL_ABSTRACT_ORIGIN (decl) = 0;
2352 /* Don't really compile an extern inline function.
2353 If we can't make it inline, pretend
2354 it was only declared. */
2355 if (DECL_EXTERNAL (decl))
2357 DECL_INITIAL (decl) = 0;
2358 goto exit_rest_of_compilation;
2362 /* ??? Note that this has the effect of making it look
2363 like "inline" was specified for a function if we choose
2364 to inline it. This isn't quite right, but it's
2365 probably not worth the trouble to fix. */
2366 inlinable = DECL_INLINE (decl) = 1;
2369 insns = get_insns ();
2371 /* Dump the rtl code if we are dumping rtl. */
2373 if (open_dump_file (DFI_rtl, decl))
2375 if (DECL_SAVED_INSNS (decl))
2376 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2377 close_dump_file (DFI_rtl, print_rtl, insns);
2380 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2381 sorts of eh initialization. Delay this until after the
2382 initial rtl dump so that we can see the original nesting. */
2383 convert_from_eh_region_ranges ();
2385 /* If function is inline, and we don't yet know whether to
2386 compile it by itself, defer decision till end of compilation.
2387 finish_compilation will call rest_of_compilation again
2388 for those functions that need to be output. Also defer those
2389 functions that we are supposed to defer. */
2392 || (DECL_INLINE (decl)
2393 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2394 && ! flag_keep_inline_functions)
2395 || DECL_EXTERNAL (decl))))
2396 DECL_DEFER_OUTPUT (decl) = 1;
2398 if (DECL_INLINE (decl))
2399 /* DWARF wants separate debugging info for abstract and
2400 concrete instances of all inline functions, including those
2401 declared inline but not inlined, and those inlined even
2402 though they weren't declared inline. Conveniently, that's
2403 what DECL_INLINE means at this point. */
2404 (*debug_hooks->deferred_inline_function) (decl);
2406 if (DECL_DEFER_OUTPUT (decl))
2408 /* If -Wreturn-type, we have to do a bit of compilation. We just
2409 want to call cleanup the cfg to figure out whether or not we can
2410 fall off the end of the function; we do the minimum amount of
2411 work necessary to make that safe. */
2412 if (warn_return_type)
2414 int saved_optimize = optimize;
2417 rebuild_jump_labels (insns);
2418 find_exception_handler_labels ();
2419 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2420 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2421 optimize = saved_optimize;
2423 /* CFG is no longer maintained up-to-date. */
2424 free_bb_for_insn ();
2427 current_function_nothrow = nothrow_function_p ();
2428 if (current_function_nothrow)
2429 /* Now we know that this can't throw; set the flag for the benefit
2430 of other functions later in this translation unit. */
2431 TREE_NOTHROW (current_function_decl) = 1;
2433 timevar_push (TV_INTEGRATION);
2434 save_for_inline (decl);
2435 timevar_pop (TV_INTEGRATION);
2436 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2437 goto exit_rest_of_compilation;
2440 /* If specified extern inline but we aren't inlining it, we are
2441 done. This goes for anything that gets here with DECL_EXTERNAL
2442 set, not just things with DECL_INLINE. */
2443 if (DECL_EXTERNAL (decl))
2444 goto exit_rest_of_compilation;
2447 /* If we're emitting a nested function, make sure its parent gets
2448 emitted as well. Doing otherwise confuses debug info. */
2451 for (parent = DECL_CONTEXT (current_function_decl);
2452 parent != NULL_TREE;
2453 parent = get_containing_scope (parent))
2454 if (TREE_CODE (parent) == FUNCTION_DECL)
2455 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2458 /* We are now committed to emitting code for this function. Do any
2459 preparation, such as emitting abstract debug info for the inline
2460 before it gets mangled by optimization. */
2461 if (DECL_INLINE (decl))
2462 (*debug_hooks->outlining_inline_function) (decl);
2464 /* Remove any notes we don't need. That will make iterating
2465 over the instruction sequence faster, and allow the garbage
2466 collector to reclaim the memory used by the notes. */
2467 remove_unnecessary_notes ();
2472 /* Initialize some variables used by the optimizers. */
2473 init_function_for_compilation ();
2475 if (! DECL_DEFER_OUTPUT (decl))
2476 TREE_ASM_WRITTEN (decl) = 1;
2478 /* Now that integrate will no longer see our rtl, we need not
2479 distinguish between the return value of this function and the
2480 return value of called functions. Also, we can remove all SETs
2481 of subregs of hard registers; they are only here because of
2482 integrate. Also, we can now initialize pseudos intended to
2483 carry magic hard reg data throughout the function. */
2484 rtx_equal_function_value_matters = 0;
2485 purge_hard_subreg_sets (get_insns ());
2487 /* Early return if there were errors. We can run afoul of our
2488 consistency checks, and there's not really much point in fixing them.
2489 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2490 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2491 || errorcount || sorrycount)
2492 goto exit_rest_of_compilation;
2494 /* We may have potential sibling or tail recursion sites. Select one
2495 (of possibly multiple) methods of performing the call. */
2496 if (flag_optimize_sibling_calls)
2498 timevar_push (TV_JUMP);
2499 open_dump_file (DFI_sibling, decl);
2501 optimize_sibling_and_tail_recursive_calls ();
2503 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2504 timevar_pop (TV_JUMP);
2507 /* Complete generation of exception handling code. */
2508 find_exception_handler_labels ();
2511 timevar_push (TV_JUMP);
2512 open_dump_file (DFI_eh, decl);
2514 finish_eh_generation ();
2516 close_dump_file (DFI_eh, print_rtl, get_insns ());
2517 timevar_pop (TV_JUMP);
2520 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2521 generation, which might create new sets. */
2522 emit_initial_value_sets ();
2525 /* If we are doing position-independent code generation, now
2526 is the time to output special prologues and epilogues.
2527 We do not want to do this earlier, because it just clutters
2528 up inline functions with meaningless insns. */
2533 insns = get_insns ();
2535 /* Copy any shared structure that should not be shared. */
2536 unshare_all_rtl (current_function_decl, insns);
2538 #ifdef SETJMP_VIA_SAVE_AREA
2539 /* This must be performed before virtual register instantiation. */
2540 if (current_function_calls_alloca)
2541 optimize_save_area_alloca (insns);
2544 /* Instantiate all virtual registers. */
2545 instantiate_virtual_regs (current_function_decl, insns);
2547 open_dump_file (DFI_jump, decl);
2549 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2550 are initialized and to compute whether control can drop off the end
2553 timevar_push (TV_JUMP);
2554 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2555 before jump optimization switches branch directions. */
2556 expected_value_to_br_prob ();
2558 reg_scan (insns, max_reg_num (), 0);
2559 rebuild_jump_labels (insns);
2560 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2562 dump_flow_info (rtl_dump_file);
2563 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2564 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2566 /* CFG is no longer maintained up-to-date. */
2567 free_bb_for_insn ();
2568 copy_loop_headers (insns);
2569 purge_line_number_notes (insns);
2571 timevar_pop (TV_JUMP);
2572 close_dump_file (DFI_jump, print_rtl, insns);
2574 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2575 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2577 goto exit_rest_of_compilation;
2580 /* Long term, this should probably move before the jump optimizer too,
2581 but I didn't want to disturb the rtl_dump_and_exit and related
2582 stuff at this time. */
2583 if (optimize > 0 && flag_ssa)
2585 /* Convert to SSA form. */
2587 timevar_push (TV_TO_SSA);
2588 open_dump_file (DFI_ssa, decl);
2590 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2591 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2594 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2595 timevar_pop (TV_TO_SSA);
2597 /* Perform sparse conditional constant propagation, if requested. */
2600 timevar_push (TV_SSA_CCP);
2601 open_dump_file (DFI_ssa_ccp, decl);
2605 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2606 timevar_pop (TV_SSA_CCP);
2609 /* It would be useful to cleanup the CFG at this point, but block
2610 merging and possibly other transformations might leave a PHI
2611 node in the middle of a basic block, which is a strict no-no. */
2613 /* The SSA implementation uses basic block numbers in its phi
2614 nodes. Thus, changing the control-flow graph or the basic
2615 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2616 may cause problems. */
2620 /* Remove dead code. */
2622 timevar_push (TV_SSA_DCE);
2623 open_dump_file (DFI_ssa_dce, decl);
2625 insns = get_insns ();
2626 ssa_eliminate_dead_code();
2628 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2629 timevar_pop (TV_SSA_DCE);
2632 /* Convert from SSA form. */
2634 timevar_push (TV_FROM_SSA);
2635 open_dump_file (DFI_ussa, decl);
2637 convert_from_ssa ();
2638 /* New registers have been created. Rescan their usage. */
2639 reg_scan (insns, max_reg_num (), 1);
2641 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2642 timevar_pop (TV_FROM_SSA);
2645 /* CFG is no longer maintained up-to-date. */
2646 free_bb_for_insn ();
2649 timevar_push (TV_JUMP);
2653 open_dump_file (DFI_null, decl);
2654 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2656 dump_flow_info (rtl_dump_file);
2657 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2659 /* Try to identify useless null pointer tests and delete them. */
2660 if (flag_delete_null_pointer_checks)
2661 delete_null_pointer_checks (insns);
2663 timevar_push (TV_IFCVT);
2665 timevar_pop (TV_IFCVT);
2666 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2667 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2670 /* Jump optimization, and the removal of NULL pointer checks, may
2671 have reduced the number of instructions substantially. CSE, and
2672 future passes, allocate arrays whose dimensions involve the
2673 maximum instruction UID, so if we can reduce the maximum UID
2674 we'll save big on memory. */
2675 renumber_insns (rtl_dump_file);
2677 compute_bb_for_insn (get_max_uid ());
2678 timevar_pop (TV_JUMP);
2680 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2684 /* Perform common subexpression elimination.
2685 Nonzero value from `cse_main' means that jumps were simplified
2686 and some code may now be unreachable, so do
2687 jump optimization again. */
2691 open_dump_file (DFI_cse, decl);
2693 dump_flow_info (rtl_dump_file);
2694 timevar_push (TV_CSE);
2696 reg_scan (insns, max_reg_num (), 1);
2698 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2700 rebuild_jump_labels (insns);
2701 purge_all_dead_edges (0);
2703 delete_trivially_dead_insns (insns, max_reg_num ());
2705 /* If we are not running more CSE passes, then we are no longer
2706 expecting CSE to be run. But always rerun it in a cheap mode. */
2707 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2709 if (tem || optimize > 1)
2710 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2711 /* Try to identify useless null pointer tests and delete them. */
2712 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2714 timevar_push (TV_JUMP);
2716 if (flag_delete_null_pointer_checks)
2717 delete_null_pointer_checks (insns);
2718 /* CFG is no longer maintained up-to-date. */
2719 timevar_pop (TV_JUMP);
2722 /* The second pass of jump optimization is likely to have
2723 removed a bunch more instructions. */
2724 renumber_insns (rtl_dump_file);
2725 compute_bb_for_insn (get_max_uid ());
2727 timevar_pop (TV_CSE);
2728 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2731 open_dump_file (DFI_addressof, decl);
2733 purge_addressof (insns);
2735 purge_all_dead_edges (0);
2736 reg_scan (insns, max_reg_num (), 1);
2738 close_dump_file (DFI_addressof, print_rtl, insns);
2742 /* Perform global cse. */
2744 if (optimize > 0 && flag_gcse)
2746 int save_csb, save_cfj;
2749 timevar_push (TV_GCSE);
2750 open_dump_file (DFI_gcse, decl);
2752 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2753 tem = gcse_main (insns, rtl_dump_file);
2754 rebuild_jump_labels (insns);
2755 delete_trivially_dead_insns (insns, max_reg_num ());
2757 save_csb = flag_cse_skip_blocks;
2758 save_cfj = flag_cse_follow_jumps;
2759 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2761 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2763 if (flag_expensive_optimizations)
2765 timevar_push (TV_CSE);
2766 reg_scan (insns, max_reg_num (), 1);
2767 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2768 purge_all_dead_edges (0);
2769 delete_trivially_dead_insns (insns, max_reg_num ());
2770 timevar_pop (TV_CSE);
2771 cse_not_expected = !flag_rerun_cse_after_loop;
2774 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2775 things up. Then possibly re-run CSE again. */
2779 timevar_push (TV_JUMP);
2780 rebuild_jump_labels (insns);
2781 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2782 timevar_pop (TV_JUMP);
2784 if (flag_expensive_optimizations)
2786 timevar_push (TV_CSE);
2787 reg_scan (insns, max_reg_num (), 1);
2788 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2789 purge_all_dead_edges (0);
2790 delete_trivially_dead_insns (insns, max_reg_num ());
2791 timevar_pop (TV_CSE);
2795 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2796 timevar_pop (TV_GCSE);
2799 flag_cse_skip_blocks = save_csb;
2800 flag_cse_follow_jumps = save_cfj;
2801 #ifdef ENABLE_CHECKING
2802 verify_flow_info ();
2806 /* Move constant computations out of loops. */
2808 if (optimize > 0 && flag_loop_optimize)
2810 timevar_push (TV_LOOP);
2811 delete_dead_jumptables ();
2812 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2813 open_dump_file (DFI_loop, decl);
2814 /* CFG is no longer maintained up-to-date. */
2815 free_bb_for_insn ();
2817 if (flag_rerun_loop_opt)
2819 cleanup_barriers ();
2821 /* We only want to perform unrolling once. */
2823 loop_optimize (insns, rtl_dump_file, 0);
2825 /* The first call to loop_optimize makes some instructions
2826 trivially dead. We delete those instructions now in the
2827 hope that doing so will make the heuristics in loop work
2828 better and possibly speed up compilation. */
2829 delete_trivially_dead_insns (insns, max_reg_num ());
2831 /* The regscan pass is currently necessary as the alias
2832 analysis code depends on this information. */
2833 reg_scan (insns, max_reg_num (), 1);
2835 cleanup_barriers ();
2836 loop_optimize (insns, rtl_dump_file,
2837 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2838 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2840 /* Loop can create trivially dead instructions. */
2841 delete_trivially_dead_insns (insns, max_reg_num ());
2842 close_dump_file (DFI_loop, print_rtl, insns);
2843 timevar_pop (TV_LOOP);
2848 /* Do control and data flow analysis; wrote some of the results to
2851 timevar_push (TV_FLOW);
2852 open_dump_file (DFI_cfg, decl);
2854 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2856 dump_flow_info (rtl_dump_file);
2857 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2858 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2860 /* It may make more sense to mark constant functions after dead code is
2861 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2862 may insert code making function non-constant, but we still must consider
2863 it as constant, otherwise -fbranch-probabilities will not read data back.
2865 life_analyzis rarely eliminates modification of external memory.
2867 mark_constant_function ();
2869 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2871 /* Do branch profiling and static profile estimation passes. */
2872 if (optimize > 0 || profile_arc_flag || flag_test_coverage
2873 || flag_branch_probabilities)
2877 timevar_push (TV_BRANCH_PROB);
2878 open_dump_file (DFI_bp, decl);
2879 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2882 /* Discover and record the loop depth at the head of each basic
2883 block. The loop infrastructure does the real job for us. */
2884 flow_loops_find (&loops, LOOP_TREE);
2886 /* Estimate using heuristics if no profiling info is available. */
2887 if (flag_guess_branch_prob)
2888 estimate_probability (&loops);
2891 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2893 flow_loops_free (&loops);
2894 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2895 timevar_pop (TV_BRANCH_PROB);
2900 timevar_push (TV_CSE2);
2901 open_dump_file (DFI_cse2, decl);
2903 dump_flow_info (rtl_dump_file);
2905 if (flag_rerun_cse_after_loop)
2907 timevar_push (TV_JUMP);
2909 reg_scan (insns, max_reg_num (), 0);
2911 timevar_push (TV_IFCVT);
2912 cleanup_cfg (CLEANUP_EXPENSIVE);
2914 timevar_pop(TV_IFCVT);
2916 timevar_pop (TV_JUMP);
2917 /* CFG is no longer maintained up-to-date. */
2918 reg_scan (insns, max_reg_num (), 0);
2919 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2920 purge_all_dead_edges (0);
2921 delete_trivially_dead_insns (insns, max_reg_num ());
2925 timevar_push (TV_JUMP);
2926 rebuild_jump_labels (insns);
2927 cleanup_cfg (CLEANUP_EXPENSIVE);
2928 timevar_pop (TV_JUMP);
2932 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2933 timevar_pop (TV_CSE2);
2938 cse_not_expected = 1;
2940 open_dump_file (DFI_life, decl);
2943 check_function_return_warnings ();
2945 #ifdef ENABLE_CHECKING
2946 verify_flow_info ();
2948 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2950 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2951 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2952 timevar_pop (TV_FLOW);
2956 if (warn_uninitialized || extra_warnings)
2958 uninitialized_vars_warning (DECL_INITIAL (decl));
2960 setjmp_args_warning ();
2966 if (initialize_uninitialized_subregs ())
2968 /* Insns were inserted, so things might look a bit different. */
2969 insns = get_insns ();
2970 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
2971 PROP_LOG_LINKS | PROP_REG_INFO
2972 | PROP_DEATH_NOTES);
2976 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2980 /* If -opt, try combining insns through substitution. */
2984 int rebuild_jump_labels_after_combine = 0;
2986 timevar_push (TV_COMBINE);
2987 open_dump_file (DFI_combine, decl);
2989 rebuild_jump_labels_after_combine
2990 = combine_instructions (insns, max_reg_num ());
2992 /* Combining insns may have turned an indirect jump into a
2993 direct jump. Rebuid the JUMP_LABEL fields of jumping
2995 if (rebuild_jump_labels_after_combine)
2997 timevar_push (TV_JUMP);
2998 rebuild_jump_labels (insns);
2999 timevar_pop (TV_JUMP);
3001 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3004 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3005 timevar_pop (TV_COMBINE);
3010 /* Rerun if-conversion, as combine may have simplified things enough to
3011 now meet sequence length restrictions. */
3014 timevar_push (TV_IFCVT);
3015 open_dump_file (DFI_ce, decl);
3021 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3022 timevar_pop (TV_IFCVT);
3025 /* Register allocation pre-pass, to reduce number of moves
3026 necessary for two-address machines. */
3027 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3029 timevar_push (TV_REGMOVE);
3030 open_dump_file (DFI_regmove, decl);
3032 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3034 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3035 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3036 timevar_pop (TV_REGMOVE);
3041 /* Do unconditional splitting before register allocation to allow machine
3042 description to add extra information not needed previously. */
3043 split_all_insns (1);
3045 /* Any of the several passes since flow1 will have munged register
3046 lifetime data a bit. */
3047 register_life_up_to_date = 0;
3049 #ifdef OPTIMIZE_MODE_SWITCHING
3050 timevar_push (TV_MODE_SWITCH);
3053 optimize_mode_switching (NULL);
3056 timevar_pop (TV_MODE_SWITCH);
3059 timevar_push (TV_SCHED);
3061 #ifdef INSN_SCHEDULING
3063 /* Print function header into sched dump now
3064 because doing the sched analysis makes some of the dump. */
3065 if (optimize > 0 && flag_schedule_insns)
3067 open_dump_file (DFI_sched, decl);
3069 /* Do control and data sched analysis,
3070 and write some of the results to dump file. */
3072 schedule_insns (rtl_dump_file);
3074 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3076 /* Register lifetime information was updated as part of verifying
3078 register_life_up_to_date = 1;
3081 timevar_pop (TV_SCHED);
3085 /* Determine if the current function is a leaf before running reload
3086 since this can impact optimizations done by the prologue and
3087 epilogue thus changing register elimination offsets. */
3088 current_function_is_leaf = leaf_function_p ();
3090 timevar_push (TV_LOCAL_ALLOC);
3091 open_dump_file (DFI_lreg, decl);
3093 /* Allocate pseudo-regs that are used only within 1 basic block.
3095 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3096 jump optimizer after register allocation and reloading are finished. */
3098 if (! register_life_up_to_date)
3099 recompute_reg_usage (insns, ! optimize_size);
3101 /* Allocate the reg_renumber array. */
3102 allocate_reg_info (max_regno, FALSE, TRUE);
3104 /* And the reg_equiv_memory_loc array. */
3105 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3107 allocate_initial_values (reg_equiv_memory_loc);
3109 regclass (insns, max_reg_num (), rtl_dump_file);
3110 rebuild_label_notes_after_reload = local_alloc ();
3112 timevar_pop (TV_LOCAL_ALLOC);
3114 if (dump_file[DFI_lreg].enabled)
3116 timevar_push (TV_DUMP);
3118 dump_flow_info (rtl_dump_file);
3119 dump_local_alloc (rtl_dump_file);
3121 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3122 timevar_pop (TV_DUMP);
3127 timevar_push (TV_GLOBAL_ALLOC);
3128 open_dump_file (DFI_greg, decl);
3130 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3131 pass fixing up any insns that are invalid. */
3134 failure = global_alloc (rtl_dump_file);
3137 build_insn_chain (insns);
3138 failure = reload (insns, 0);
3141 timevar_pop (TV_GLOBAL_ALLOC);
3143 if (dump_file[DFI_greg].enabled)
3145 timevar_push (TV_DUMP);
3147 dump_global_regs (rtl_dump_file);
3149 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3150 timevar_pop (TV_DUMP);
3154 goto exit_rest_of_compilation;
3158 open_dump_file (DFI_postreload, decl);
3160 /* Do a very simple CSE pass over just the hard registers. */
3163 timevar_push (TV_RELOAD_CSE_REGS);
3164 reload_cse_regs (insns);
3165 timevar_pop (TV_RELOAD_CSE_REGS);
3168 /* Register allocation and reloading may have turned an indirect jump into
3169 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3170 jumping instructions. */
3171 if (rebuild_label_notes_after_reload)
3173 timevar_push (TV_JUMP);
3175 rebuild_jump_labels (insns);
3176 purge_all_dead_edges (0);
3178 timevar_pop (TV_JUMP);
3181 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3183 /* Re-create the death notes which were deleted during reload. */
3184 timevar_push (TV_FLOW2);
3185 open_dump_file (DFI_flow2, decl);
3187 #ifdef ENABLE_CHECKING
3188 verify_flow_info ();
3191 /* If optimizing, then go ahead and split insns now. */
3193 split_all_insns (0);
3195 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3197 /* On some machines, the prologue and epilogue code, or parts thereof,
3198 can be represented as RTL. Doing so lets us schedule insns between
3199 it and the rest of the code and also allows delayed branch
3200 scheduling to operate in the epilogue. */
3201 thread_prologue_and_epilogue_insns (insns);
3205 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3206 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3207 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3209 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3210 even for machines with possibly nonzero RETURN_POPS_ARGS
3211 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3212 push instructions will have popping returns. */
3213 #ifndef PUSH_ROUNDING
3214 if (!ACCUMULATE_OUTGOING_ARGS)
3216 combine_stack_adjustments ();
3221 flow2_completed = 1;
3223 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3224 timevar_pop (TV_FLOW2);
3226 #ifdef HAVE_peephole2
3227 if (optimize > 0 && flag_peephole2)
3229 timevar_push (TV_PEEPHOLE2);
3230 open_dump_file (DFI_peephole2, decl);
3232 peephole2_optimize (rtl_dump_file);
3234 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3235 timevar_pop (TV_PEEPHOLE2);
3239 if (flag_rename_registers || flag_cprop_registers)
3241 timevar_push (TV_RENAME_REGISTERS);
3242 open_dump_file (DFI_rnreg, decl);
3244 if (flag_rename_registers)
3245 regrename_optimize ();
3246 if (flag_cprop_registers)
3247 copyprop_hardreg_forward ();
3249 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3250 timevar_pop (TV_RENAME_REGISTERS);
3255 timevar_push (TV_IFCVT2);
3256 open_dump_file (DFI_ce2, decl);
3260 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3261 timevar_pop (TV_IFCVT2);
3265 split_all_insns (1);
3268 #ifdef INSN_SCHEDULING
3269 if (optimize > 0 && flag_schedule_insns_after_reload)
3271 timevar_push (TV_SCHED2);
3272 open_dump_file (DFI_sched2, decl);
3274 /* Do control and data sched analysis again,
3275 and write some more of the results to dump file. */
3277 split_all_insns (1);
3279 schedule_insns (rtl_dump_file);
3281 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3282 timevar_pop (TV_SCHED2);
3288 #ifdef LEAF_REGISTERS
3289 current_function_uses_only_leaf_regs
3290 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3294 timevar_push (TV_REG_STACK);
3295 open_dump_file (DFI_stack, decl);
3297 reg_to_stack (insns, rtl_dump_file);
3299 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3300 timevar_pop (TV_REG_STACK);
3306 timevar_push (TV_REORDER_BLOCKS);
3307 open_dump_file (DFI_bbro, decl);
3309 /* Last attempt to optimize CFG, as scheduling, peepholing
3310 and insn splitting possibly introduced more crossjumping
3312 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3313 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3314 if (flag_reorder_blocks)
3316 reorder_basic_blocks ();
3317 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3320 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3321 timevar_pop (TV_REORDER_BLOCKS);
3323 compute_alignments ();
3325 /* CFG is no longer maintained up-to-date. */
3326 free_bb_for_insn ();
3328 /* If a machine dependent reorganization is needed, call it. */
3329 #ifdef MACHINE_DEPENDENT_REORG
3330 timevar_push (TV_MACH_DEP);
3331 open_dump_file (DFI_mach, decl);
3333 MACHINE_DEPENDENT_REORG (insns);
3335 close_dump_file (DFI_mach, print_rtl, insns);
3336 timevar_pop (TV_MACH_DEP);
3341 purge_line_number_notes (insns);
3342 cleanup_barriers ();
3344 /* If a scheduling pass for delayed branches is to be done,
3345 call the scheduling code. */
3348 if (optimize > 0 && flag_delayed_branch)
3350 timevar_push (TV_DBR_SCHED);
3351 open_dump_file (DFI_dbr, decl);
3353 dbr_schedule (insns, rtl_dump_file);
3355 close_dump_file (DFI_dbr, print_rtl, insns);
3356 timevar_pop (TV_DBR_SCHED);
3362 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3363 timevar_push (TV_SHORTEN_BRANCH);
3364 split_all_insns_noflow ();
3365 timevar_pop (TV_SHORTEN_BRANCH);
3368 convert_to_eh_region_ranges ();
3370 /* Shorten branches. */
3371 timevar_push (TV_SHORTEN_BRANCH);
3372 shorten_branches (get_insns ());
3373 timevar_pop (TV_SHORTEN_BRANCH);
3375 current_function_nothrow = nothrow_function_p ();
3376 if (current_function_nothrow)
3377 /* Now we know that this can't throw; set the flag for the benefit
3378 of other functions later in this translation unit. */
3379 TREE_NOTHROW (current_function_decl) = 1;
3381 /* Now turn the rtl into assembler code. */
3383 timevar_push (TV_FINAL);
3388 /* Get the function's name, as described by its RTL. This may be
3389 different from the DECL_NAME name used in the source file. */
3391 x = DECL_RTL (decl);
3392 if (GET_CODE (x) != MEM)
3395 if (GET_CODE (x) != SYMBOL_REF)
3397 fnname = XSTR (x, 0);
3399 assemble_start_function (decl, fnname);
3400 final_start_function (insns, asm_out_file, optimize);
3401 final (insns, asm_out_file, optimize, 0);
3402 final_end_function ();
3404 #ifdef IA64_UNWIND_INFO
3405 /* ??? The IA-64 ".handlerdata" directive must be issued before
3406 the ".endp" directive that closes the procedure descriptor. */
3407 output_function_exception_table ();
3410 assemble_end_function (decl, fnname);
3412 #ifndef IA64_UNWIND_INFO
3413 /* Otherwise, it feels unclean to switch sections in the middle. */
3414 output_function_exception_table ();
3418 fflush (asm_out_file);
3420 /* Release all memory allocated by flow. */
3421 free_basic_block_vars (0);
3423 /* Release all memory held by regsets now. */
3424 regset_release_memory ();
3426 timevar_pop (TV_FINAL);
3430 /* Write DBX symbols if requested. */
3432 /* Note that for those inline functions where we don't initially
3433 know for certain that we will be generating an out-of-line copy,
3434 the first invocation of this routine (rest_of_compilation) will
3435 skip over this code by doing a `goto exit_rest_of_compilation;'.
3436 Later on, finish_compilation will call rest_of_compilation again
3437 for those inline functions that need to have out-of-line copies
3438 generated. During that call, we *will* be routed past here. */
3440 timevar_push (TV_SYMOUT);
3441 (*debug_hooks->function_decl) (decl);
3442 timevar_pop (TV_SYMOUT);
3444 exit_rest_of_compilation:
3446 /* In case the function was not output,
3447 don't leave any temporary anonymous types
3448 queued up for sdb output. */
3449 #ifdef SDB_DEBUGGING_INFO
3450 if (write_symbols == SDB_DEBUG)
3451 sdbout_types (NULL_TREE);
3454 reload_completed = 0;
3455 flow2_completed = 0;
3458 timevar_push (TV_FINAL);
3460 /* Clear out the insn_length contents now that they are no
3462 init_insn_lengths ();
3464 /* Clear out the real_constant_chain before some of the rtx's
3465 it runs through become garbage. */
3466 clear_const_double_mem ();
3468 /* Show no temporary slots allocated. */
3471 free_basic_block_vars (0);
3472 free_bb_for_insn ();
3474 timevar_pop (TV_FINAL);
3476 /* Make sure volatile mem refs aren't considered valid operands for
3477 arithmetic insns. We must call this here if this is a nested inline
3478 function, since the above code leaves us in the init_recog state
3479 (from final.c), and the function context push/pop code does not
3480 save/restore volatile_ok.
3482 ??? Maybe it isn't necessary for expand_start_function to call this
3483 anymore if we do it here? */
3485 init_recog_no_volatile ();
3487 /* We're done with this function. Free up memory if we can. */
3488 free_after_parsing (cfun);
3489 if (! DECL_DEFER_OUTPUT (decl))
3491 free_after_compilation (cfun);
3493 /* Clear integrate.c's pointer to the cfun structure we just
3495 DECL_SAVED_INSNS (decl) = 0;
3501 timevar_pop (TV_REST_OF_COMPILATION);
3511 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3512 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3513 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3514 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3515 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3516 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"));
3518 for (i = ARRAY_SIZE (f_options); i--;)
3520 const char *description = f_options[i].description;
3522 if (description != NULL && * description != 0)
3523 printf (" -f%-21s %s\n",
3524 f_options[i].string, _(description));
3527 printf (_(" -O[number] Set optimization level to [number]\n"));
3528 printf (_(" -Os Optimize for space rather than speed\n"));
3529 for (i = LAST_PARAM; i--;)
3531 const char *description = compiler_params[i].help;
3532 const int length = 21-strlen(compiler_params[i].option);
3534 if (description != NULL && * description != 0)
3535 printf (" --param %s=<value>%.*s%s\n",
3536 compiler_params[i].option,
3537 length > 0 ? length : 1, " ",
3540 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3541 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3542 printf (_(" -w Suppress warnings\n"));
3543 printf (_(" -W Enable extra warnings\n"));
3545 for (i = ARRAY_SIZE (W_options); i--;)
3547 const char *description = W_options[i].description;
3549 if (description != NULL && * description != 0)
3550 printf (" -W%-21s %s\n",
3551 W_options[i].string, _(description));
3554 printf (_(" -Wunused Enable unused warnings\n"));
3555 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3556 printf (_(" -p Enable function profiling\n"));
3557 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3558 printf (_(" -a Enable block profiling \n"));
3560 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3561 printf (_(" -ax Enable jump profiling \n"));
3563 printf (_(" -o <file> Place output into <file> \n"));
3565 -G <number> Put global and static data smaller than <number>\n\
3566 bytes into a special section (on some targets)\n"));
3568 for (i = ARRAY_SIZE (debug_args); i--;)
3570 if (debug_args[i].description != NULL)
3571 printf (" -g%-21s %s\n",
3572 debug_args[i].arg, _(debug_args[i].description));
3575 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3576 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3577 printf (_(" -version Display the compiler's version\n"));
3578 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3579 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3580 #if defined INSN_SCHEDULING
3581 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3583 printf (_(" --help Display this information\n"));
3588 /* Display descriptions of language specific options.
3589 If there is no description, note that there is an undocumented option.
3590 If the description is empty, do not display anything. (This allows
3591 options to be deliberately undocumented, for whatever reason).
3592 If the option string is missing, then this is a marker, indicating
3593 that the description string is in fact the name of a language, whose
3594 language specific options are to follow. */
3596 if (ARRAY_SIZE (documented_lang_options) > 1)
3598 printf (_("\nLanguage specific options:\n"));
3600 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3602 const char *description = documented_lang_options[i].description;
3603 const char *option = documented_lang_options[i].option;
3605 if (description == NULL)
3610 printf (_(" %-23.23s [undocumented]\n"), option);
3612 else if (*description == 0)
3614 else if (option == NULL)
3618 (_("\nThere are undocumented %s specific options as well.\n"),
3622 printf (_("\n Options for %s:\n"), description);
3627 printf (" %-23.23s %s\n", option, _(description));
3632 printf (_("\nThere are undocumented %s specific options as well.\n"),
3635 display_target_options ();
3639 display_target_options ()
3642 static bool displayed = false;
3644 /* Avoid double printing for --help --target-help. */
3649 if (ARRAY_SIZE (target_switches) > 1
3650 #ifdef TARGET_OPTIONS
3651 || ARRAY_SIZE (target_options) > 1
3659 printf (_("\nTarget specific options:\n"));
3661 for (i = ARRAY_SIZE (target_switches); i--;)
3663 const char *option = target_switches[i].name;
3664 const char *description = target_switches[i].description;
3666 if (option == NULL || *option == 0)
3668 else if (description == NULL)
3673 printf (_(" -m%-23.23s [undocumented]\n"), option);
3675 else if (* description != 0)
3676 doc += printf (" -m%-23.23s %s\n", option, _(description));
3679 #ifdef TARGET_OPTIONS
3680 for (i = ARRAY_SIZE (target_options); i--;)
3682 const char *option = target_options[i].prefix;
3683 const char *description = target_options[i].description;
3685 if (option == NULL || *option == 0)
3687 else if (description == NULL)
3692 printf (_(" -m%-23.23s [undocumented]\n"), option);
3694 else if (* description != 0)
3695 doc += printf (" -m%-23.23s %s\n", option, _(description));
3701 printf (_("\nThere are undocumented target specific options as well.\n"));
3703 printf (_(" They exist, but they are not documented.\n"));
3708 /* Parse a -d... command line switch. */
3711 decode_d_option (arg)
3720 for (i = 0; i < (int) DFI_MAX; ++i)
3721 dump_file[i].enabled = 1;
3727 flag_print_asm_name = 1;
3730 flag_dump_rtl_in_asm = 1;
3731 flag_print_asm_name = 1;
3734 graph_dump_format = vcg;
3737 rtl_dump_and_exit = 1;
3740 (*lang_hooks.set_yydebug) (1);
3742 case 'D': /* These are handled by the preprocessor. */
3748 for (i = 0; i < (int) DFI_MAX; ++i)
3749 if (c == dump_file[i].debug_switch)
3751 dump_file[i].enabled = 1;
3756 warning ("unrecognized gcc debugging option: %c", c);
3761 /* Parse a -f... command line switch. ARG is the value after the -f.
3762 It is safe to access 'ARG - 2' to generate the full switch name.
3763 Return the number of strings consumed. */
3766 decode_f_option (arg)
3770 const char *option_value = NULL;
3772 /* Search for the option in the table of binary f options. */
3773 for (j = ARRAY_SIZE (f_options); j--;)
3775 if (!strcmp (arg, f_options[j].string))
3777 *f_options[j].variable = f_options[j].on_value;
3781 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3782 && ! strcmp (arg + 3, f_options[j].string))
3784 *f_options[j].variable = ! f_options[j].on_value;
3789 if (!strcmp (arg, "fast-math"))
3790 set_fast_math_flags ();
3791 else if (!strcmp (arg, "no-fast-math"))
3792 set_no_fast_math_flags ();
3793 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3794 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3797 read_integral_parameter (option_value, arg - 2,
3799 set_param_value ("max-inline-insns", val);
3801 #ifdef INSN_SCHEDULING
3802 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3803 fix_sched_param ("verbose", option_value);
3805 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3806 fix_register (option_value, 1, 1);
3807 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3808 fix_register (option_value, 0, 1);
3809 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3810 fix_register (option_value, 0, 0);
3811 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3812 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3813 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3815 = read_integral_parameter (option_value, arg - 2, align_functions);
3816 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3817 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3818 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3820 = read_integral_parameter (option_value, arg - 2, align_labels);
3821 else if ((option_value
3822 = skip_leading_substring (arg, "stack-limit-register=")))
3824 int reg = decode_reg_name (option_value);
3826 error ("unrecognized register name `%s'", option_value);
3828 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3830 else if ((option_value
3831 = skip_leading_substring (arg, "stack-limit-symbol=")))
3834 nm = ggc_strdup (option_value);
3835 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3837 else if ((option_value
3838 = skip_leading_substring (arg, "message-length=")))
3839 output_set_maximum_length
3840 (&global_dc->buffer, read_integral_parameter
3841 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3842 else if ((option_value
3843 = skip_leading_substring (arg, "diagnostics-show-location=")))
3845 if (!strcmp (option_value, "once"))
3846 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3847 else if (!strcmp (option_value, "every-line"))
3848 diagnostic_prefixing_rule (global_dc)
3849 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3851 error ("unrecognized option `%s'", arg - 2);
3853 else if (!strcmp (arg, "no-stack-limit"))
3854 stack_limit_rtx = NULL_RTX;
3855 else if (!strcmp (arg, "preprocessed"))
3856 /* Recognise this switch but do nothing. This prevents warnings
3857 about an unrecognized switch if cpplib has not been linked in. */
3865 /* Parse a -W... command line switch. ARG is the value after the -W.
3866 It is safe to access 'ARG - 2' to generate the full switch name.
3867 Return the number of strings consumed. */
3870 decode_W_option (arg)
3873 const char *option_value = NULL;
3876 /* Search for the option in the table of binary W options. */
3878 for (j = ARRAY_SIZE (W_options); j--;)
3880 if (!strcmp (arg, W_options[j].string))
3882 *W_options[j].variable = W_options[j].on_value;
3886 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3887 && ! strcmp (arg + 3, W_options[j].string))
3889 *W_options[j].variable = ! W_options[j].on_value;
3894 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3895 warning ("-Wid-clash-LEN is no longer supported");
3896 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3898 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3900 warn_larger_than = larger_than_size != -1;
3902 else if (!strcmp (arg, "unused"))
3906 else if (!strcmp (arg, "no-unused"))
3916 /* Parse a -g... command line switch. ARG is the value after the -g.
3917 It is safe to access 'ARG - 2' to generate the full switch name.
3918 Return the number of strings consumed. */
3921 decode_g_option (arg)
3924 static unsigned level=0;
3925 /* A lot of code assumes write_symbols == NO_DEBUG if the
3926 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3927 of what debugging type has been selected). This records the
3928 selected type. It is an error to specify more than one
3930 static enum debug_info_type selected_debug_type = NO_DEBUG;
3931 /* Non-zero if debugging format has been explicitly set.
3932 -g and -ggdb don't explicitly set the debugging format so
3933 -gdwarf -g3 is equivalent to -gdwarf3. */
3934 static int type_explicitly_set_p = 0;
3935 /* Indexed by enum debug_info_type. */
3936 static const char *const debug_type_names[] =
3938 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3941 /* The maximum admissible debug level value. */
3942 static const unsigned max_debug_level = 3;
3944 /* Look up ARG in the table. */
3945 for (da = debug_args; da->arg; da++)
3947 const int da_len = strlen (da->arg);
3949 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3951 enum debug_info_type type = da->debug_type;
3952 const char *p = arg + da_len;
3954 if (*p && ! ISDIGIT (*p))
3957 /* A debug flag without a level defaults to level 2.
3958 Note we do not want to call read_integral_parameter
3959 for that case since it will call atoi which
3962 ??? We may want to generalize the interface to
3963 read_integral_parameter to better handle this case
3964 if this case shows up often. */
3966 level = read_integral_parameter (p, 0, max_debug_level + 1);
3968 level = (level == 0) ? 2 : level;
3970 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
3972 error ("use -gdwarf -g%d for DWARF v1, level %d",
3975 error ("use -gdwarf-2 for DWARF v2");
3978 if (level > max_debug_level)
3981 ignoring option `%s' due to invalid debug level specification",
3983 level = debug_info_level;
3986 if (type == NO_DEBUG)
3988 type = PREFERRED_DEBUGGING_TYPE;
3990 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
3992 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
3993 type = DWARF2_DEBUG;
3995 #ifdef DBX_DEBUGGING_INFO
4002 if (type == NO_DEBUG)
4003 warning ("`%s': unknown or unsupported -g option", arg - 2);
4005 /* Does it conflict with an already selected type? */
4006 if (type_explicitly_set_p
4007 /* -g/-ggdb don't conflict with anything. */
4008 && da->debug_type != NO_DEBUG
4009 && type != selected_debug_type)
4010 warning ("`%s' ignored, conflicts with `-g%s'",
4011 arg - 2, debug_type_names[(int) selected_debug_type]);
4014 /* If the format has already been set, -g/-ggdb
4015 only change the debug level. */
4016 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4017 /* Don't change debugging type. */
4021 selected_debug_type = type;
4022 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4025 write_symbols = (level == 0
4027 : selected_debug_type);
4028 use_gnu_debug_info_extensions = da->use_extensions_p;
4029 debug_info_level = (enum debug_info_level) level;
4042 /* Decode the first argument in the argv as a language-independent option.
4043 Return the number of strings consumed. */
4046 independent_decode_option (argc, argv)
4050 char *arg = argv[0];
4052 if (arg[0] != '-' || arg[1] == 0)
4064 if (!strcmp (arg, "-help"))
4067 exit_after_options = 1;
4070 if (!strcmp (arg, "-target-help"))
4072 display_target_options ();
4073 exit_after_options = 1;
4076 if (!strcmp (arg, "-version"))
4078 print_version (stderr, "");
4079 exit_after_options = 1;
4082 /* Handle '--param <name>=<value>'. */
4083 if (strcmp (arg, "-param") == 0)
4089 error ("-param option missing argument");
4093 /* Get the '<name>=<value>' parameter. */
4095 /* Look for the `='. */
4096 equal = strchr (arg, '=');
4098 error ("invalid --param option: %s", arg);
4103 /* Zero out the `=' sign so that we get two separate strings. */
4105 /* Figure out what value is specified. */
4106 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4107 if (val != INVALID_PARAM_VAL)
4108 set_param_value (arg, val);
4110 error ("invalid parameter value `%s'", equal + 1);
4125 /* Already been treated in main (). Do nothing. */
4129 set_target_switch (arg + 1);
4133 return decode_f_option (arg + 1);
4136 return decode_g_option (arg + 1);
4139 if (!strcmp (arg, "dumpbase"))
4144 dump_base_name = argv[1];
4148 decode_d_option (arg + 1);
4152 if (!strcmp (arg, "pedantic"))
4154 else if (!strcmp (arg, "pedantic-errors"))
4155 flag_pedantic_errors = pedantic = 1;
4156 else if (arg[1] == 0)
4163 if (!strcmp (arg, "quiet"))
4170 if (!strcmp (arg, "version"))
4178 inhibit_warnings = 1;
4187 /* We save the value of warn_uninitialized, since if they put
4188 -Wuninitialized on the command line, we need to generate a
4189 warning about not using it without also specifying -O. */
4190 if (warn_uninitialized != 1)
4191 warn_uninitialized = 2;
4194 return decode_W_option (arg + 1);
4198 if (!strncmp (arg, "aux-info", 8))
4205 aux_info_file_name = argv[1];
4206 flag_gen_aux_info = 1;
4209 else if (arg[8] == '=')
4211 aux_info_file_name = arg + 9;
4212 flag_gen_aux_info = 1;
4227 asm_file_name = argv[1];
4242 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4247 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4251 if (g_switch_val == -1)
4255 g_switch_set = TRUE;
4256 g_switch_value = g_switch_val;
4266 /* Decode -m switches. */
4267 /* Decode the switch -mNAME. */
4270 set_target_switch (name)
4274 int valid_target_option = 0;
4276 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4277 if (!strcmp (target_switches[j].name, name))
4279 if (target_switches[j].value < 0)
4280 target_flags &= ~-target_switches[j].value;
4282 target_flags |= target_switches[j].value;
4283 valid_target_option = 1;
4286 #ifdef TARGET_OPTIONS
4287 if (!valid_target_option)
4288 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4290 int len = strlen (target_options[j].prefix);
4291 if (!strncmp (target_options[j].prefix, name, len))
4293 *target_options[j].variable = name + len;
4294 valid_target_option = 1;
4299 if (!valid_target_option)
4300 error ("invalid option `%s'", name);
4303 /* Print version information to FILE.
4304 Each line begins with INDENT (for the case where FILE is the
4305 assembler output file). */
4308 print_version (file, indent)
4313 #define __VERSION__ "[?]"
4317 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4319 "%s%s%s version %s (%s) compiled by CC.\n"
4321 , indent, *indent != 0 ? " " : "",
4322 lang_hooks.name, version_string, TARGET_NAME,
4323 indent, __VERSION__);
4326 /* Print an option value and return the adjusted position in the line.
4327 ??? We don't handle error returns from fprintf (disk full); presumably
4328 other code will catch a disk full though. */
4331 print_single_switch (file, pos, max, indent, sep, term, type, name)
4334 const char *indent, *sep, *term, *type, *name;
4336 /* The ultrix fprintf returns 0 on success, so compute the result we want
4337 here since we need it for the following test. */
4338 int len = strlen (sep) + strlen (type) + strlen (name);
4343 fprintf (file, "%s", term);
4348 fprintf (file, "%s", indent);
4349 pos = strlen (indent);
4351 fprintf (file, "%s%s%s", sep, type, name);
4356 /* Print active target switches to FILE.
4357 POS is the current cursor position and MAX is the size of a "line".
4358 Each line begins with INDENT and ends with TERM.
4359 Each switch is separated from the next by SEP. */
4362 print_switch_values (file, pos, max, indent, sep, term)
4365 const char *indent, *sep, *term;
4370 /* Print the options as passed. */
4372 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4373 _("options passed: "), "");
4375 for (p = &save_argv[1]; *p != NULL; p++)
4379 if (strcmp (*p, "-o") == 0)
4385 if (strcmp (*p, "-quiet") == 0)
4387 if (strcmp (*p, "-version") == 0)
4392 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4395 fprintf (file, "%s", term);
4397 /* Print the -f and -m options that have been enabled.
4398 We don't handle language specific options but printing argv
4401 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4402 _("options enabled: "), "");
4404 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4405 if (*f_options[j].variable == f_options[j].on_value)
4406 pos = print_single_switch (file, pos, max, indent, sep, term,
4407 "-f", f_options[j].string);
4409 /* Print target specific options. */
4411 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4412 if (target_switches[j].name[0] != '\0'
4413 && target_switches[j].value > 0
4414 && ((target_switches[j].value & target_flags)
4415 == target_switches[j].value))
4417 pos = print_single_switch (file, pos, max, indent, sep, term,
4418 "-m", target_switches[j].name);
4421 #ifdef TARGET_OPTIONS
4422 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4423 if (*target_options[j].variable != NULL)
4426 sprintf (prefix, "-m%s", target_options[j].prefix);
4427 pos = print_single_switch (file, pos, max, indent, sep, term,
4428 prefix, *target_options[j].variable);
4432 fprintf (file, "%s", term);
4435 /* Open assembly code output file. Do this even if -fsyntax-only is
4436 on, because then the driver will have provided the name of a
4437 temporary file or bit bucket for us. NAME is the file specified on
4438 the command line, possibly NULL. */
4440 init_asm_output (name)
4443 if (name == NULL && asm_file_name == 0)
4444 asm_out_file = stdout;
4447 if (asm_file_name == 0)
4449 int len = strlen (dump_base_name);
4450 char *dumpname = (char *) xmalloc (len + 6);
4451 memcpy (dumpname, dump_base_name, len + 1);
4452 strip_off_ending (dumpname, len);
4453 strcat (dumpname, ".s");
4454 asm_file_name = dumpname;
4456 if (!strcmp (asm_file_name, "-"))
4457 asm_out_file = stdout;
4459 asm_out_file = fopen (asm_file_name, "w");
4460 if (asm_out_file == 0)
4461 fatal_io_error ("can't open %s for writing", asm_file_name);
4464 #ifdef IO_BUFFER_SIZE
4465 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4466 _IOFBF, IO_BUFFER_SIZE);
4469 if (!flag_syntax_only)
4471 #ifdef ASM_FILE_START
4472 ASM_FILE_START (asm_out_file);
4475 #ifdef ASM_COMMENT_START
4476 if (flag_verbose_asm)
4478 /* Print the list of options in effect. */
4479 print_version (asm_out_file, ASM_COMMENT_START);
4480 print_switch_values (asm_out_file, 0, MAX_LINE,
4481 ASM_COMMENT_START, " ", "\n");
4482 /* Add a blank line here so it appears in assembler output but not
4484 fprintf (asm_out_file, "\n");
4490 /* Initialization of the front end environment, before command line
4491 options are parsed. Signal handlers, internationalization etc.
4492 ARGV0 is main's argv[0]. */
4494 general_init (argv0)
4499 p = argv0 + strlen (argv0);
4500 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4504 xmalloc_set_program_name (progname);
4506 gcc_init_libintl ();
4508 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4510 signal (SIGSEGV, crash_signal);
4513 signal (SIGILL, crash_signal);
4516 signal (SIGBUS, crash_signal);
4519 signal (SIGABRT, crash_signal);
4521 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4522 signal (SIGIOT, crash_signal);
4525 signal (SIGFPE, crash_signal);
4528 /* Initialize the diagnostics reporting machinery, so option parsing
4529 can give warnings and errors. */
4530 diagnostic_initialize (global_dc);
4533 /* Parse command line options and set default flag values, called
4534 after language-independent option-independent initialization. Do
4535 minimal options processing. Outputting diagnostics is OK, but GC
4536 and identifier hashtables etc. are not initialized yet. */
4538 parse_options_and_default_flags (argc, argv)
4544 /* Save in case md file wants to emit args as a comment. */
4548 /* Initialize register usage now so switches may override. */
4551 /* Register the language-independent parameters. */
4552 add_params (lang_independent_params, LAST_PARAM);
4554 /* Perform language-specific options initialization. */
4555 (*lang_hooks.init_options) ();
4557 /* Scan to see what optimization level has been specified. That will
4558 determine the default value of many flags. */
4559 for (i = 1; i < argc; i++)
4561 if (!strcmp (argv[i], "-O"))
4566 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4568 /* Handle -Os, -O2, -O3, -O69, ... */
4569 char *p = &argv[i][2];
4571 if ((p[0] == 's') && (p[1] == 0))
4575 /* Optimizing for size forces optimize to be 2. */
4580 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4581 if (optimize_val != -1)
4583 optimize = optimize_val;
4592 flag_merge_constants = 0;
4598 flag_thread_jumps = 1;
4600 flag_delayed_branch = 1;
4602 #ifdef CAN_DEBUG_WITHOUT_FP
4603 flag_omit_frame_pointer = 1;
4605 flag_guess_branch_prob = 1;
4606 flag_cprop_registers = 1;
4607 flag_loop_optimize = 1;
4608 flag_crossjumping = 1;
4613 flag_optimize_sibling_calls = 1;
4614 flag_cse_follow_jumps = 1;
4615 flag_cse_skip_blocks = 1;
4617 flag_expensive_optimizations = 1;
4618 flag_strength_reduce = 1;
4619 flag_rerun_cse_after_loop = 1;
4620 flag_rerun_loop_opt = 1;
4621 flag_caller_saves = 1;
4624 #ifdef INSN_SCHEDULING
4625 flag_schedule_insns = 1;
4626 flag_schedule_insns_after_reload = 1;
4629 flag_strict_aliasing = 1;
4630 flag_delete_null_pointer_checks = 1;
4631 flag_reorder_blocks = 1;
4636 flag_inline_functions = 1;
4637 flag_rename_registers = 1;
4640 if (optimize < 2 || optimize_size)
4645 align_functions = 1;
4648 /* Initialize whether `char' is signed. */
4649 flag_signed_char = DEFAULT_SIGNED_CHAR;
4650 #ifdef DEFAULT_SHORT_ENUMS
4651 /* Initialize how much space enums occupy, by default. */
4652 flag_short_enums = DEFAULT_SHORT_ENUMS;
4655 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4658 set_target_switch ("");
4660 /* Unwind tables are always present in an ABI-conformant IA-64
4661 object file, so the default should be ON. */
4662 #ifdef IA64_UNWIND_INFO
4663 flag_unwind_tables = IA64_UNWIND_INFO;
4666 #ifdef OPTIMIZATION_OPTIONS
4667 /* Allow default optimizations to be specified on a per-machine basis. */
4668 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4671 /* Perform normal command line switch decoding. */
4672 for (i = 1; i < argc;)
4675 int indep_processed;
4677 /* Give the language a chance to decode the option for itself. */
4678 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4680 if (lang_processed >= 0)
4681 /* Now see if the option also has a language independent meaning.
4682 Some options are both language specific and language independent,
4684 indep_processed = independent_decode_option (argc - i, argv + i);
4687 lang_processed = -lang_processed;
4688 indep_processed = 0;
4691 if (lang_processed || indep_processed)
4692 i += MAX (lang_processed, indep_processed);
4695 const char *option = NULL;
4696 const char *lang = NULL;
4699 /* It is possible that the command line switch is not valid for the
4700 current language, but it is valid for another language. In order
4701 to be compatible with previous versions of the compiler (which
4702 did not issue an error message in this case) we check for this
4703 possibility here. If we do find a match, then if extra_warnings
4704 is set we generate a warning message, otherwise we will just
4705 ignore the option. */
4706 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4708 option = documented_lang_options[j].option;
4711 lang = documented_lang_options[j].description;
4712 else if (! strncmp (argv[i], option, strlen (option)))
4716 if (j != ARRAY_SIZE (documented_lang_options))
4720 warning ("ignoring command line option '%s'", argv[i]);
4723 ("(it is valid for %s but not the selected language)",
4727 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4728 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4730 error ("unrecognized option `%s'", argv[i]);
4736 /* Set flag_no_inline before the post_options () hook. The C front
4737 ends use it to determine tree inlining defaults. FIXME: such
4738 code should be lang-independent when all front ends use tree
4739 inlining, in which case it, and this condition, should be moved
4740 to the top of process_options() instead. */
4743 /* Inlining does not work if not optimizing,
4744 so force it not to be done. */
4748 /* The c_decode_option function and decode_option hook set
4749 this to `2' if -Wall is used, so we can avoid giving out
4750 lots of errors for people who don't realize what -Wall does. */
4751 if (warn_uninitialized == 1)
4752 warning ("-Wuninitialized is not supported without -O");
4755 /* All command line options have been parsed; allow the front end to
4756 perform consistency checks, etc. */
4757 (*lang_hooks.post_options) ();
4760 /* Process the options that have been parsed. */
4764 #ifdef OVERRIDE_OPTIONS
4765 /* Some machines may reject certain combinations of options. */
4769 /* Set up the align_*_log variables, defaulting them to 1 if they
4770 were still unset. */
4771 if (align_loops <= 0) align_loops = 1;
4772 if (align_loops_max_skip > align_loops || !align_loops)
4773 align_loops_max_skip = align_loops - 1;
4774 align_loops_log = floor_log2 (align_loops * 2 - 1);
4775 if (align_jumps <= 0) align_jumps = 1;
4776 if (align_jumps_max_skip > align_jumps || !align_jumps)
4777 align_jumps_max_skip = align_jumps - 1;
4778 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4779 if (align_labels <= 0) align_labels = 1;
4780 align_labels_log = floor_log2 (align_labels * 2 - 1);
4781 if (align_labels_max_skip > align_labels || !align_labels)
4782 align_labels_max_skip = align_labels - 1;
4783 if (align_functions <= 0) align_functions = 1;
4784 align_functions_log = floor_log2 (align_functions * 2 - 1);
4786 /* Unrolling all loops implies that standard loop unrolling must also
4788 if (flag_unroll_all_loops)
4789 flag_unroll_loops = 1;
4790 /* Loop unrolling requires that strength_reduction be on also. Silently
4791 turn on strength reduction here if it isn't already on. Also, the loop
4792 unrolling code assumes that cse will be run after loop, so that must
4793 be turned on also. */
4794 if (flag_unroll_loops)
4796 flag_strength_reduce = 1;
4797 flag_rerun_cse_after_loop = 1;
4800 if (flag_non_call_exceptions)
4801 flag_asynchronous_unwind_tables = 1;
4802 if (flag_asynchronous_unwind_tables)
4803 flag_unwind_tables = 1;
4805 /* Warn about options that are not supported on this machine. */
4806 #ifndef INSN_SCHEDULING
4807 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4808 warning ("instruction scheduling not supported on this target machine");
4811 if (flag_delayed_branch)
4812 warning ("this target machine does not have delayed branches");
4815 /* Some operating systems do not allow profiling without a frame
4817 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4819 && flag_omit_frame_pointer)
4821 error ("profiling does not work without a frame pointer");
4822 flag_omit_frame_pointer = 0;
4825 user_label_prefix = USER_LABEL_PREFIX;
4826 if (flag_leading_underscore != -1)
4828 /* If the default prefix is more complicated than "" or "_",
4829 issue a warning and ignore this option. */
4830 if (user_label_prefix[0] == 0 ||
4831 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4833 user_label_prefix = flag_leading_underscore ? "_" : "";
4836 warning ("-f%sleading-underscore not supported on this target machine",
4837 flag_leading_underscore ? "" : "no-");
4840 /* If we are in verbose mode, write out the version and maybe all the
4841 option flags in use. */
4844 print_version (stderr, "");
4846 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4852 if (flag_syntax_only)
4854 write_symbols = NO_DEBUG;
4858 /* Now we know write_symbols, set up the debug hooks based on it.
4859 By default we do nothing for debug output. */
4860 #if defined(DBX_DEBUGGING_INFO)
4861 if (write_symbols == DBX_DEBUG)
4862 debug_hooks = &dbx_debug_hooks;
4864 #if defined(XCOFF_DEBUGGING_INFO)
4865 if (write_symbols == XCOFF_DEBUG)
4866 debug_hooks = &xcoff_debug_hooks;
4868 #ifdef SDB_DEBUGGING_INFO
4869 if (write_symbols == SDB_DEBUG)
4870 debug_hooks = &sdb_debug_hooks;
4872 #ifdef DWARF_DEBUGGING_INFO
4873 if (write_symbols == DWARF_DEBUG)
4874 debug_hooks = &dwarf_debug_hooks;
4876 #ifdef DWARF2_DEBUGGING_INFO
4877 if (write_symbols == DWARF2_DEBUG)
4878 debug_hooks = &dwarf2_debug_hooks;
4880 #ifdef VMS_DEBUGGING_INFO
4881 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4882 debug_hooks = &vmsdbg_debug_hooks;
4885 /* If auxiliary info generation is desired, open the output file.
4886 This goes in the same directory as the source file--unlike
4887 all the other output files. */
4888 if (flag_gen_aux_info)
4890 aux_info_file = fopen (aux_info_file_name, "w");
4891 if (aux_info_file == 0)
4892 fatal_io_error ("can't open %s", aux_info_file_name);
4895 if (! targetm.have_named_sections)
4897 if (flag_function_sections)
4899 warning ("-ffunction-sections not supported for this target");
4900 flag_function_sections = 0;
4902 if (flag_data_sections)
4904 warning ("-fdata-sections not supported for this target");
4905 flag_data_sections = 0;
4909 if (flag_function_sections && profile_flag)
4911 warning ("-ffunction-sections disabled; it makes profiling impossible");
4912 flag_function_sections = 0;
4915 #ifndef HAVE_prefetch
4916 if (flag_prefetch_loop_arrays)
4918 warning ("-fprefetch-loop-arrays not supported for this target");
4919 flag_prefetch_loop_arrays = 0;
4922 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4924 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4925 flag_prefetch_loop_arrays = 0;
4929 /* This combination of options isn't handled for i386 targets and doesn't
4930 make much sense anyway, so don't allow it. */
4931 if (flag_prefetch_loop_arrays && optimize_size)
4933 warning ("-fprefetch-loop-arrays is not supported with -Os");
4934 flag_prefetch_loop_arrays = 0;
4937 #ifndef OBJECT_FORMAT_ELF
4938 if (flag_function_sections && write_symbols != NO_DEBUG)
4939 warning ("-ffunction-sections may affect debugging on some targets");
4943 /* Language-independent initialization, before language-dependent
4946 lang_independent_init ()
4948 lang_expand_expr = (lang_expand_expr_t) do_abort;
4950 /* Initialize the garbage-collector, and string pools. */
4952 ggc_add_rtx_root (&stack_limit_rtx, 1);
4953 ggc_add_tree_root (¤t_function_decl, 1);
4954 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4959 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4960 || debug_info_level == DINFO_LEVEL_VERBOSE
4961 #ifdef VMS_DEBUGGING_INFO
4962 /* Enable line number info for traceback */
4963 || debug_info_level > DINFO_LEVEL_NONE
4965 || flag_test_coverage
4966 || warn_notreached);
4972 init_function_once ();
4973 init_stor_layout_once ();
4974 init_varasm_once ();
4975 init_EXPR_INSN_LIST_cache ();
4977 /* The following initialization functions need to generate rtl, so
4978 provide a dummy function context for them. */
4979 init_dummy_function_start ();
4982 if (flag_caller_saves)
4983 init_caller_save ();
4984 expand_dummy_function_end ();
4987 /* Language-dependent initialization. Returns non-zero on success. */
4989 lang_dependent_init (name)
4992 if (dump_base_name == 0)
4993 dump_base_name = name ? name : "gccdump";
4995 /* Front-end initialization. This hook can assume that GC,
4996 identifier hashes etc. are set up, but debug initialization is
4997 not done yet. This routine must return the original filename
4998 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
4999 name = (*lang_hooks.init) (name);
5003 /* Is this duplication necessary? */
5004 name = ggc_strdup (name);
5005 main_input_filename = input_filename = name;
5006 init_asm_output (name);
5008 /* These create various _DECL nodes, so need to be called after the
5009 front end is initialized. */
5013 /* Put an entry on the input file stack for the main input file. */
5014 push_srcloc (input_filename, 0);
5016 /* If dbx symbol table desired, initialize writing it and output the
5017 predefined types. */
5018 timevar_push (TV_SYMOUT);
5020 #ifdef DWARF2_UNWIND_INFO
5021 if (dwarf2out_do_frame ())
5022 dwarf2out_frame_init ();
5025 /* Now we have the correct original filename, we can initialize
5027 (*debug_hooks->init) (name);
5029 timevar_pop (TV_SYMOUT);
5034 /* Clean up: close opened files, etc. */
5039 /* Close the dump files. */
5040 if (flag_gen_aux_info)
5042 fclose (aux_info_file);
5044 unlink (aux_info_file_name);
5047 /* Close non-debugging input and output files. Take special care to note
5048 whether fclose returns an error, since the pages might still be on the
5049 buffer chain while the file is open. */
5053 if (ferror (asm_out_file) != 0)
5054 fatal_io_error ("error writing to %s", asm_file_name);
5055 if (fclose (asm_out_file) != 0)
5056 fatal_io_error ("error closing %s", asm_file_name);
5059 /* Do whatever is necessary to finish printing the graphs. */
5060 if (graph_dump_format != no_graph)
5064 for (i = 0; i < (int) DFI_MAX; ++i)
5065 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5070 sprintf (seq, DUMPFILE_FORMAT, i);
5071 suffix = concat (seq, dump_file[i].extension, NULL);
5072 finish_graph_dump_file (dump_base_name, suffix);
5079 ggc_print_statistics ();
5080 stringpool_statistics ();
5081 dump_tree_statistics ();
5084 /* Free up memory for the benefit of leak detectors. */
5087 /* Language-specific end of compilation actions. */
5088 (*lang_hooks.finish) ();
5091 /* Initialize the compiler, and compile the input file. */
5095 /* The bulk of command line switch processing. */
5098 /* We cannot start timing until after options are processed since that
5099 says if we run timers or not. */
5101 timevar_start (TV_TOTAL);
5103 /* Language-independent initialization. Also sets up GC, identifier
5105 lang_independent_init ();
5107 /* Language-dependent initialization. Returns true on success. */
5108 if (lang_dependent_init (filename))
5113 /* Stop timing and print the times. */
5114 timevar_stop (TV_TOTAL);
5115 timevar_print (stderr);
5118 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5119 Decode command args, then call compile_file.
5120 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5121 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5123 It is not safe to call this function more than once. */
5126 toplev_main (argc, argv)
5132 /* Initialization of GCC's environment, and diagnostics. */
5133 general_init (argv [0]);
5135 /* Parse the options and do minimal processing; basically just
5136 enough to default flags appropriately. */
5137 parse_options_and_default_flags (argc, argv);
5139 /* Exit early if we can (e.g. -help). */
5140 if (!exit_after_options)
5143 if (errorcount || sorrycount)
5144 return (FATAL_EXIT_CODE);
5146 return (SUCCESS_EXIT_CODE);