1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 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. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.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. */
95 /* The extra parameters substantially improve the I/O performance. */
98 vms_fopen (fname, type)
102 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
103 fixed arguments, which matches ANSI's specification but not VAXCRTL's
104 pre-ANSI implementation. This hack circumvents the mismatch problem. */
105 FILE *(*vmslib_fopen)() = (FILE *(*)()) fopen;
108 return (*vmslib_fopen) (fname, type, "mbc=32",
109 "deq=64", "fop=tef", "shr=nil");
111 return (*vmslib_fopen) (fname, type, "mbc=32");
114 #define fopen vms_fopen
117 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
118 extern char **environ;
121 /* Carry information from ASM_DECLARE_OBJECT_NAME
122 to ASM_FINISH_DECLARE_OBJECT. */
124 extern int size_directive_output;
125 extern tree last_assemble_variable_decl;
127 static void general_init PARAMS ((char *));
128 static void parse_options_and_default_flags PARAMS ((int, char **));
129 static void do_compile PARAMS ((void));
130 static void process_options PARAMS ((void));
131 static void lang_independent_init PARAMS ((void));
132 static int lang_dependent_init PARAMS ((const char *));
133 static void init_asm_output PARAMS ((const char *));
134 static void finalize PARAMS ((void));
136 static void set_target_switch PARAMS ((const char *));
137 static const char *decl_name PARAMS ((tree, int));
139 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
140 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
141 static void set_float_handler PARAMS ((jmp_buf));
142 static void compile_file PARAMS ((void));
143 static void display_help PARAMS ((void));
144 static void display_target_options PARAMS ((void));
146 static void decode_d_option PARAMS ((const char *));
147 static int decode_f_option PARAMS ((const char *));
148 static int decode_W_option PARAMS ((const char *));
149 static int decode_g_option PARAMS ((const char *));
150 static unsigned int independent_decode_option PARAMS ((int, char **));
152 static void print_version PARAMS ((FILE *, const char *));
153 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
154 const char *, const char *,
155 const char *, const char *));
156 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
157 const char *, const char *));
159 /* Length of line when printing switch values. */
162 /* Name of program invoked, sans directories. */
164 const char *progname;
166 /* Copy of arguments to toplev_main. */
170 /* Name of current original source file (what was input to cpp).
171 This comes from each #-command in the actual input. */
173 const char *input_filename;
175 /* Name of top-level original source file (what was input to cpp).
176 This comes from the #-command at the beginning of the actual input.
177 If there isn't any there, then this is the cc1 input file name. */
179 const char *main_input_filename;
181 /* Current line number in real source file. */
185 /* Nonzero if it is unsafe to create any new pseudo registers. */
188 /* Stack of currently pending input files. */
190 struct file_stack *input_file_stack;
192 /* Incremented on each change to input_file_stack. */
193 int input_file_stack_tick;
195 /* Name to use as base of names for dump output files. */
197 const char *dump_base_name;
199 /* Format to use to print dumpfile index value */
200 #ifndef DUMPFILE_FORMAT
201 #define DUMPFILE_FORMAT ".%02d."
204 /* Bit flags that specify the machine subtype we are compiling for.
205 Bits are tested using macros TARGET_... defined in the tm.h file
206 and set by `-m...' switches. Must be defined in rtlanal.c. */
208 extern int target_flags;
210 /* Debug hooks - dependent upon command line options. */
212 struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
214 /* Describes a dump file. */
216 struct dump_file_info
218 /* The unique extension to apply, e.g. ".jump". */
219 const char *const extension;
221 /* The -d<c> character that enables this dump file. */
222 char const debug_switch;
224 /* True if there is a corresponding graph dump file. */
225 char const graph_dump_p;
227 /* True if the user selected this dump. */
230 /* True if the files have been initialized (ie truncated). */
234 /* Enumerate the extant dump files. */
273 /* Describes all the dump files. Should be kept in order of the
274 pass and in sync with dump_file_index above.
276 Remaining -d letters:
282 struct dump_file_info dump_file[DFI_MAX] =
284 { "rtl", 'r', 0, 0, 0 },
285 { "sibling", 'i', 0, 0, 0 },
286 { "eh", 'h', 0, 0, 0 },
287 { "jump", 'j', 0, 0, 0 },
288 { "ssa", 'e', 1, 0, 0 },
289 { "ssaccp", 'W', 1, 0, 0 },
290 { "ssadce", 'X', 1, 0, 0 },
291 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
292 { "cse", 's', 0, 0, 0 },
293 { "addressof", 'F', 0, 0, 0 },
294 { "gcse", 'G', 1, 0, 0 },
295 { "loop", 'L', 1, 0, 0 },
296 { "cse2", 't', 1, 0, 0 },
297 { "cfg", 'f', 1, 0, 0 },
298 { "bp", 'b', 1, 0, 0 },
299 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
300 { "combine", 'c', 1, 0, 0 },
301 { "ce", 'C', 1, 0, 0 },
302 { "regmove", 'N', 1, 0, 0 },
303 { "sched", 'S', 1, 0, 0 },
304 { "lreg", 'l', 1, 0, 0 },
305 { "greg", 'g', 1, 0, 0 },
306 { "postreload", 'o', 1, 0, 0 },
307 { "flow2", 'w', 1, 0, 0 },
308 { "peephole2", 'z', 1, 0, 0 },
309 { "rnreg", 'n', 1, 0, 0 },
310 { "ce2", 'E', 1, 0, 0 },
311 { "sched2", 'R', 1, 0, 0 },
312 { "stack", 'k', 1, 0, 0 },
313 { "bbro", 'B', 1, 0, 0 },
314 { "mach", 'M', 1, 0, 0 },
315 { "dbr", 'd', 0, 0, 0 },
318 static int open_dump_file PARAMS ((enum dump_file_index, tree));
319 static void close_dump_file PARAMS ((enum dump_file_index,
320 void (*) (FILE *, rtx), rtx));
322 /* Other flags saying which kinds of debugging dump have been requested. */
324 int rtl_dump_and_exit;
325 int flag_print_asm_name;
326 static int version_flag;
327 static char *filename;
328 enum graph_dump_types graph_dump_format;
330 /* Name for output file of assembly code, specified with -o. */
334 /* Value of the -G xx switch, and whether it was passed or not. */
338 /* Type(s) of debugging information we are producing (if any).
339 See flags.h for the definitions of the different possible
340 types of debugging information. */
341 enum debug_info_type write_symbols = NO_DEBUG;
343 /* Level of debugging information we are producing. See flags.h
344 for the definitions of the different possible levels. */
345 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
347 /* Nonzero means use GNU-only extensions in the generated symbolic
348 debugging information. */
349 /* Currently, this only has an effect when write_symbols is set to
350 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
351 int use_gnu_debug_info_extensions = 0;
353 /* Nonzero means do optimizations. -O.
354 Particular numeric values stand for particular amounts of optimization;
355 thus, -O2 stores 2 here. However, the optimizations beyond the basic
356 ones are not controlled directly by this variable. Instead, they are
357 controlled by individual `flag_...' variables that are defaulted
358 based on this variable. */
362 /* Nonzero means optimize for size. -Os.
363 The only valid values are zero and non-zero. When optimize_size is
364 non-zero, optimize defaults to 2, but certain individual code
365 bloating optimizations are disabled. */
367 int optimize_size = 0;
369 /* Nonzero if we should exit after parsing options. */
370 static int exit_after_options = 0;
372 /* The FUNCTION_DECL for the function currently being compiled,
373 or 0 if between functions. */
374 tree current_function_decl;
376 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
378 tree current_function_func_begin_label;
380 /* Pointer to function to compute the name to use to print a declaration.
381 DECL is the declaration in question.
382 VERBOSITY determines what information will be printed:
383 0: DECL_NAME, demangled as necessary.
384 1: and scope information.
385 2: and any other information that might be interesting, such as function
386 parameter types in C++. */
388 const char *(*decl_printable_name) PARAMS ((tree, int));
390 /* Pointer to function to compute rtl for a language-specific tree code. */
392 typedef rtx (*lang_expand_expr_t)
393 PARAMS ((union tree_node *, rtx, enum machine_mode,
394 enum expand_modifier modifier));
396 lang_expand_expr_t lang_expand_expr = 0;
398 /* Pointer to function to finish handling an incomplete decl at the
399 end of compilation. */
401 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
403 /* Nonzero if doing dwarf2 duplicate elimination. */
405 int flag_eliminate_dwarf2_dups = 0;
407 /* Nonzero if generating code to do profiling. */
409 int profile_flag = 0;
411 /* Nonzero if generating code to profile program flow graph arcs. */
413 int profile_arc_flag = 0;
415 /* Nonzero if generating info for gcov to calculate line test coverage. */
417 int flag_test_coverage = 0;
419 /* Nonzero indicates that branch taken probabilities should be calculated. */
421 int flag_branch_probabilities = 0;
423 /* Nonzero if basic blocks should be reordered. */
425 int flag_reorder_blocks = 0;
427 /* Nonzero if registers should be renamed. */
429 int flag_rename_registers = 0;
430 int flag_cprop_registers = 0;
432 /* Nonzero for -pedantic switch: warn about anything
433 that standard spec forbids. */
437 /* Temporarily suppress certain warnings.
438 This is set while reading code from a system header file. */
440 int in_system_header = 0;
442 /* Don't print functions as they are compiled. -quiet. */
446 /* Print times taken by the various passes. -ftime-report. */
450 /* Print memory still in use at end of compilation (which may have little
451 to do with peak memory consumption). -fmem-report. */
455 /* Non-zero means to collect statistics which might be expensive
456 and to print them when we are done. */
457 int flag_detailed_statistics = 0;
462 /* Nonzero means `char' should be signed. */
464 int flag_signed_char;
466 /* Nonzero means give an enum type only as many bytes as it needs. */
468 int flag_short_enums;
470 /* Nonzero for -fcaller-saves: allocate values in regs that need to
471 be saved across function calls, if that produces overall better code.
472 Optional now, so people can test it. */
474 #ifdef DEFAULT_CALLER_SAVES
475 int flag_caller_saves = 1;
477 int flag_caller_saves = 0;
480 /* Nonzero if structures and unions should be returned in memory.
482 This should only be defined if compatibility with another compiler or
483 with an ABI is needed, because it results in slower code. */
485 #ifndef DEFAULT_PCC_STRUCT_RETURN
486 #define DEFAULT_PCC_STRUCT_RETURN 1
489 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
491 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
493 /* Nonzero for -fforce-mem: load memory value into a register
494 before arithmetic on it. This makes better cse but slower compilation. */
496 int flag_force_mem = 0;
498 /* Nonzero for -fforce-addr: load memory address into a register before
499 reference to memory. This makes better cse but slower compilation. */
501 int flag_force_addr = 0;
503 /* Nonzero for -fdefer-pop: don't pop args after each function call;
504 instead save them up to pop many calls' args with one insns. */
506 int flag_defer_pop = 0;
508 /* Nonzero for -ffloat-store: don't allocate floats and doubles
509 in extended-precision registers. */
511 int flag_float_store = 0;
513 /* Nonzero for -fcse-follow-jumps:
514 have cse follow jumps to do a more extensive job. */
516 int flag_cse_follow_jumps;
518 /* Nonzero for -fcse-skip-blocks:
519 have cse follow a branch around a block. */
520 int flag_cse_skip_blocks;
522 /* Nonzero for -fexpensive-optimizations:
523 perform miscellaneous relatively-expensive optimizations. */
524 int flag_expensive_optimizations;
526 /* Nonzero for -fthread-jumps:
527 have jump optimize output of loop. */
529 int flag_thread_jumps;
531 /* Nonzero enables strength-reduction in loop.c. */
533 int flag_strength_reduce = 0;
535 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
536 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
537 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
540 int flag_unroll_loops;
542 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
543 This is generally not a win. */
545 int flag_unroll_all_loops;
547 /* Nonzero forces all invariant computations in loops to be moved
550 int flag_move_all_movables = 0;
552 /* Nonzero forces all general induction variables in loops to be
555 int flag_reduce_all_givs = 0;
557 /* Nonzero to perform full register move optimization passes. This is the
560 int flag_regmove = 0;
562 /* Nonzero for -fwritable-strings:
563 store string constants in data segment and don't uniquize them. */
565 int flag_writable_strings = 0;
567 /* Nonzero means don't put addresses of constant functions in registers.
568 Used for compiling the Unix kernel, where strange substitutions are
569 done on the assembly output. */
571 int flag_no_function_cse = 0;
573 /* Nonzero for -fomit-frame-pointer:
574 don't make a frame pointer in simple functions that don't require one. */
576 int flag_omit_frame_pointer = 0;
578 /* Nonzero means place each function into its own section on those platforms
579 which support arbitrary section names and unlimited numbers of sections. */
581 int flag_function_sections = 0;
583 /* ... and similar for data. */
585 int flag_data_sections = 0;
587 /* Nonzero to inhibit use of define_optimization peephole opts. */
589 int flag_no_peephole = 0;
591 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
593 int flag_optimize_sibling_calls = 0;
595 /* Nonzero means the front end generally wants `errno' maintained by math
596 operations, like built-in SQRT. */
598 int flag_errno_math = 1;
600 /* Nonzero means that unsafe floating-point math optimizations are allowed
601 for the sake of speed. IEEE compliance is not guaranteed, and operations
602 are allowed to assume that their arguments and results are "normal"
603 (e.g., nonnegative for SQRT). */
605 int flag_unsafe_math_optimizations = 0;
607 /* Zero means that floating-point math operations cannot generate a
608 (user-visible) trap. This is the case, for example, in nonstop
609 IEEE 754 arithmetic. */
611 int flag_trapping_math = 1;
613 /* 0 means straightforward implementation of complex divide acceptable.
614 1 means wide ranges of inputs must work for complex divide.
615 2 means C99-like requirements for complex divide (not yet implemented). */
617 int flag_complex_divide_method = 0;
619 /* Nonzero means all references through pointers are volatile. */
623 /* Nonzero means treat all global and extern variables as volatile. */
625 int flag_volatile_global;
627 /* Nonzero means treat all static variables as volatile. */
629 int flag_volatile_static;
631 /* Nonzero means just do syntax checking; don't output anything. */
633 int flag_syntax_only = 0;
635 /* Nonzero means perform global cse. */
637 static int flag_gcse;
639 /* Nonzero means to use global dataflow analysis to eliminate
640 useless null pointer tests. */
642 static int flag_delete_null_pointer_checks;
644 /* Nonzero means to do the enhanced load motion during gcse, which trys
645 to hoist loads by not killing them when a store to the same location
648 int flag_gcse_lm = 1;
650 /* Nonzero means to perform store motion after gcse, which will try to
651 move stores closer to the exit block. Its not very effective without
654 int flag_gcse_sm = 1;
656 /* Nonzero means to rerun cse after loop optimization. This increases
657 compilation time about 20% and picks up a few more common expressions. */
659 static int flag_rerun_cse_after_loop;
661 /* Nonzero means to run loop optimizations twice. */
663 int flag_rerun_loop_opt;
665 /* Nonzero for -finline-functions: ok to inline functions that look like
666 good inline candidates. */
668 int flag_inline_functions;
670 /* Nonzero for -fkeep-inline-functions: even if we make a function
671 go inline everywhere, keep its definition around for debugging
674 int flag_keep_inline_functions;
676 /* Nonzero means that functions will not be inlined. */
680 /* Nonzero means that we should emit static const variables
681 regardless of whether or not optimization is turned on. */
683 int flag_keep_static_consts = 1;
685 /* Nonzero means we should be saving declaration info into a .X file. */
687 int flag_gen_aux_info = 0;
689 /* Specified name of aux-info file. */
691 static char *aux_info_file_name;
693 /* Nonzero means make the text shared if supported. */
695 int flag_shared_data;
697 /* Nonzero means schedule into delayed branch slots if supported. */
699 int flag_delayed_branch;
701 /* Nonzero if we are compiling pure (sharable) code.
702 Value is 1 if we are doing reasonable (i.e. simple
703 offset into offset table) pic. Value is 2 if we can
704 only perform register offsets. */
708 /* Nonzero means generate extra code for exception handling and enable
709 exception handling. */
713 /* Nonzero means generate frame unwind info table when supported. */
715 int flag_unwind_tables = 0;
717 /* Nonzero means generate frame unwind info table exact at each insn boundary */
719 int flag_asynchronous_unwind_tables = 0;
721 /* Nonzero means don't place uninitialized global data in common storage
726 /* Nonzero means pretend it is OK to examine bits of target floats,
727 even if that isn't true. The resulting code will have incorrect constants,
728 but the same series of instructions that the native compiler would make. */
730 int flag_pretend_float;
732 /* Nonzero means change certain warnings into errors.
733 Usually these are warnings about failure to conform to some standard. */
735 int flag_pedantic_errors = 0;
737 /* flag_schedule_insns means schedule insns within basic blocks (before
739 flag_schedule_insns_after_reload means schedule insns after
742 int flag_schedule_insns = 0;
743 int flag_schedule_insns_after_reload = 0;
745 /* The following flags have effect only for scheduling before register
748 flag_schedule_interblock means schedule insns accross basic blocks.
749 flag_schedule_speculative means allow speculative motion of non-load insns.
750 flag_schedule_speculative_load means allow speculative motion of some
752 flag_schedule_speculative_load_dangerous allows speculative motion of more
755 int flag_schedule_interblock = 1;
756 int flag_schedule_speculative = 1;
757 int flag_schedule_speculative_load = 0;
758 int flag_schedule_speculative_load_dangerous = 0;
760 int flag_single_precision_constant;
762 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
763 by a cheaper branch on a count register. */
764 int flag_branch_on_count_reg = 1;
766 /* -finhibit-size-directive inhibits output of .size for ELF.
767 This is used only for compiling crtstuff.c,
768 and it may be extended to other effects
769 needed for crtstuff.c on other systems. */
770 int flag_inhibit_size_directive = 0;
772 /* -fverbose-asm causes extra commentary information to be produced in
773 the generated assembly code (to make it more readable). This option
774 is generally only of use to those who actually need to read the
775 generated assembly code (perhaps while debugging the compiler itself).
776 -fno-verbose-asm, the default, causes the extra information
777 to be omitted and is useful when comparing two assembler files. */
779 int flag_verbose_asm = 0;
781 /* -dA causes debug commentary information to be produced in
782 the generated assembly code (to make it more readable). This option
783 is generally only of use to those who actually need to read the
784 generated assembly code (perhaps while debugging the compiler itself).
785 Currently, this switch is only used by dwarfout.c; however, it is intended
786 to be a catchall for printing debug information in the assembler file. */
788 int flag_debug_asm = 0;
790 /* -dP causes the rtl to be emitted as a comment in assembly. */
792 int flag_dump_rtl_in_asm = 0;
794 /* -fgnu-linker specifies use of the GNU linker for initializations.
795 (Or, more generally, a linker that handles initializations.)
796 -fno-gnu-linker says that collect2 will be used. */
798 int flag_gnu_linker = 0;
800 int flag_gnu_linker = 1;
806 /* Enable ssa conditional constant propagation. */
807 int flag_ssa_ccp = 0;
809 /* Enable ssa aggressive dead code elimination. */
810 int flag_ssa_dce = 0;
812 /* Tag all structures with __attribute__(packed). */
813 int flag_pack_struct = 0;
815 /* Emit code to check for stack overflow; also may cause large objects
816 to be allocated dynamically. */
817 int flag_stack_check;
819 /* When non-NULL, indicates that whenever space is allocated on the
820 stack, the resulting stack pointer must not pass this
821 address---that is, for stacks that grow downward, the stack pointer
822 must always be greater than or equal to this address; for stacks
823 that grow upward, the stack pointer must be less than this address.
824 At present, the rtx may be either a REG or a SYMBOL_REF, although
825 the support provided depends on the backend. */
828 /* 0 if pointer arguments may alias each other. True in C.
829 1 if pointer arguments may not alias each other but may alias
831 2 if pointer arguments may not alias each other and may not
832 alias global variables. True in Fortran.
833 This defaults to 0 for C. */
834 int flag_argument_noalias = 0;
836 /* Nonzero if we should do (language-dependent) alias analysis.
837 Typically, this analysis will assume that expressions of certain
838 types do not alias expressions of certain other types. Only used
839 if alias analysis (in general) is enabled. */
840 int flag_strict_aliasing = 0;
842 /* Instrument functions with calls at entry and exit, for profiling. */
843 int flag_instrument_function_entry_exit = 0;
845 /* Nonzero means ignore `#ident' directives. 0 means handle them.
846 On SVR4 targets, it also controls whether or not to emit a
847 string identifying the compiler. */
849 int flag_no_ident = 0;
851 /* This will perform a peephole pass before sched2. */
852 int flag_peephole2 = 0;
854 /* This will try to guess branch probabilities. */
855 int flag_guess_branch_prob = 0;
857 /* -fbounded-pointers causes gcc to compile pointers as composite
858 objects occupying three words: the pointer value, the base address
859 of the referent object, and the address immediately beyond the end
860 of the referent object. The base and extent allow us to perform
861 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
862 int flag_bounded_pointers = 0;
864 /* -fcheck-bounds causes gcc to generate array bounds checks.
865 For C, C++: defaults to value of flag_bounded_pointers.
866 For ObjC: defaults to off.
867 For Java: defaults to on.
868 For Fortran: defaults to off.
869 For CHILL: defaults to off. */
870 int flag_bounds_check = 0;
872 /* This will attempt to merge constant section constants, if 1 only
873 string constants and constants from constant pool, if 2 also constant
875 int flag_merge_constants = 1;
877 /* If one, renumber instruction UIDs to reduce the number of
878 unused UIDs if there are a lot of instructions. If greater than
879 one, unconditionally renumber instruction UIDs. */
880 int flag_renumber_insns = 1;
882 /* Values of the -falign-* flags: how much to align labels in code.
883 0 means `use default', 1 means `don't align'.
884 For each variable, there is an _log variant which is the power
885 of two not less than the variable, for .align output. */
889 int align_loops_max_skip;
892 int align_jumps_max_skip;
894 int align_labels_log;
895 int align_labels_max_skip;
897 int align_functions_log;
899 /* Table of supported debugging formats. */
902 const char *const arg;
903 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
904 constant expression, we use NO_DEBUG in its place. */
905 const enum debug_info_type debug_type;
906 const int use_extensions_p;
907 const char *const description;
911 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
912 N_("Generate debugging info in default format") },
913 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
914 #ifdef DBX_DEBUGGING_INFO
915 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
916 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
918 #ifdef DWARF_DEBUGGING_INFO
919 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
920 { "dwarf+", DWARF_DEBUG, 1,
921 N_("Generate extended DWARF-1 format debug info") },
923 #ifdef DWARF2_DEBUGGING_INFO
924 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
926 #ifdef XCOFF_DEBUGGING_INFO
927 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
928 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
930 #ifdef SDB_DEBUGGING_INFO
931 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
941 const char *description;
943 lang_independent_options;
947 /* Add or remove a leading underscore from user symbols. */
948 int flag_leading_underscore = -1;
950 /* The user symbol prefix after having resolved same. */
951 const char *user_label_prefix;
953 static const param_info lang_independent_params[] = {
954 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
955 { OPTION, DEFAULT, HELP },
956 #include "params.def"
961 /* A default for same. */
962 #ifndef USER_LABEL_PREFIX
963 #define USER_LABEL_PREFIX ""
966 /* Table of language-independent -f options.
967 STRING is the option name. VARIABLE is the address of the variable.
968 ON_VALUE is the value to store in VARIABLE
969 if `-fSTRING' is seen as an option.
970 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
972 lang_independent_options f_options[] =
974 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
975 N_("Perform DWARF2 duplicate elimination") },
976 {"float-store", &flag_float_store, 1,
977 N_("Do not store floats in registers") },
978 {"volatile", &flag_volatile, 1,
979 N_("Consider all mem refs through pointers as volatile") },
980 {"volatile-global", &flag_volatile_global, 1,
981 N_("Consider all mem refs to global data to be volatile") },
982 {"volatile-static", &flag_volatile_static, 1,
983 N_("Consider all mem refs to static data to be volatile") },
984 {"defer-pop", &flag_defer_pop, 1,
985 N_("Defer popping functions args from stack until later") },
986 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
987 N_("When possible do not generate stack frames") },
988 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
989 N_("Optimize sibling and tail recursive calls") },
990 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
991 N_("When running CSE, follow jumps to their targets") },
992 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
993 N_("When running CSE, follow conditional jumps") },
994 {"expensive-optimizations", &flag_expensive_optimizations, 1,
995 N_("Perform a number of minor, expensive optimisations") },
996 {"thread-jumps", &flag_thread_jumps, 1,
997 N_("Perform jump threading optimisations") },
998 {"strength-reduce", &flag_strength_reduce, 1,
999 N_("Perform strength reduction optimisations") },
1000 {"unroll-loops", &flag_unroll_loops, 1,
1001 N_("Perform loop unrolling when iteration count is known") },
1002 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1003 N_("Perform loop unrolling for all loops") },
1004 {"move-all-movables", &flag_move_all_movables, 1,
1005 N_("Force all loop invariant computations out of loops") },
1006 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1007 N_("Strength reduce all loop general induction variables") },
1008 {"writable-strings", &flag_writable_strings, 1,
1009 N_("Store strings in writable data section") },
1010 {"peephole", &flag_no_peephole, 0,
1011 N_("Enable machine specific peephole optimisations") },
1012 {"force-mem", &flag_force_mem, 1,
1013 N_("Copy memory operands into registers before using") },
1014 {"force-addr", &flag_force_addr, 1,
1015 N_("Copy memory address constants into regs before using") },
1016 {"function-cse", &flag_no_function_cse, 0,
1017 N_("Allow function addresses to be held in registers") },
1018 {"inline-functions", &flag_inline_functions, 1,
1019 N_("Integrate simple functions into their callers") },
1020 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1021 N_("Generate code for funcs even if they are fully inlined") },
1022 {"inline", &flag_no_inline, 0,
1023 N_("Pay attention to the 'inline' keyword") },
1024 {"keep-static-consts", &flag_keep_static_consts, 1,
1025 N_("Emit static const variables even if they are not used") },
1026 {"syntax-only", &flag_syntax_only, 1,
1027 N_("Check for syntax errors, then stop") },
1028 {"shared-data", &flag_shared_data, 1,
1029 N_("Mark data as shared rather than private") },
1030 {"caller-saves", &flag_caller_saves, 1,
1031 N_("Enable saving registers around function calls") },
1032 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1033 N_("Return 'short' aggregates in memory, not registers") },
1034 {"reg-struct-return", &flag_pcc_struct_return, 0,
1035 N_("Return 'short' aggregates in registers") },
1036 {"delayed-branch", &flag_delayed_branch, 1,
1037 N_("Attempt to fill delay slots of branch instructions") },
1038 {"gcse", &flag_gcse, 1,
1039 N_("Perform the global common subexpression elimination") },
1040 {"gcse-lm", &flag_gcse_lm, 1,
1041 N_("Perform enhanced load motion during global subexpression elimination") },
1042 {"gcse-sm", &flag_gcse_sm, 1,
1043 N_("Perform store motion after global subexpression elimination") },
1044 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1045 N_("Run CSE pass after loop optimisations") },
1046 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1047 N_("Run the loop optimiser twice") },
1048 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1049 N_("Delete useless null pointer checks") },
1050 {"pretend-float", &flag_pretend_float, 1,
1051 N_("Pretend that host and target use the same FP format") },
1052 {"schedule-insns", &flag_schedule_insns, 1,
1053 N_("Reschedule instructions before register allocation") },
1054 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1055 N_("Reschedule instructions after register allocation") },
1056 {"sched-interblock",&flag_schedule_interblock, 1,
1057 N_("Enable scheduling across basic blocks") },
1058 {"sched-spec",&flag_schedule_speculative, 1,
1059 N_("Allow speculative motion of non-loads") },
1060 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1061 N_("Allow speculative motion of some loads") },
1062 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1063 N_("Allow speculative motion of more loads") },
1064 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1065 N_("Replace add,compare,branch with branch on count reg") },
1066 {"pic", &flag_pic, 1,
1067 N_("Generate position independent code, if possible") },
1068 {"PIC", &flag_pic, 2, ""},
1069 {"exceptions", &flag_exceptions, 1,
1070 N_("Enable exception handling") },
1071 {"unwind-tables", &flag_unwind_tables, 1,
1072 N_("Just generate unwind tables for exception handling") },
1073 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1074 N_("Generate unwind tables exact at each instruction boundary") },
1075 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1076 N_("Support synchronous non-call exceptions") },
1077 {"profile-arcs", &profile_arc_flag, 1,
1078 N_("Insert arc based program profiling code") },
1079 {"test-coverage", &flag_test_coverage, 1,
1080 N_("Create data files needed by gcov") },
1081 {"branch-probabilities", &flag_branch_probabilities, 1,
1082 N_("Use profiling information for branch probabilities") },
1083 {"reorder-blocks", &flag_reorder_blocks, 1,
1084 N_("Reorder basic blocks to improve code placement") },
1085 {"rename-registers", &flag_rename_registers, 1,
1086 N_("Do the register renaming optimization pass") },
1087 {"cprop-registers", &flag_cprop_registers, 1,
1088 N_("Do the register copy-propagation optimization pass") },
1089 {"common", &flag_no_common, 0,
1090 N_("Do not put uninitialized globals in the common section") },
1091 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1092 N_("Do not generate .size directives") },
1093 {"function-sections", &flag_function_sections, 1,
1094 N_("place each function into its own section") },
1095 {"data-sections", &flag_data_sections, 1,
1096 N_("place data items into their own section") },
1097 {"verbose-asm", &flag_verbose_asm, 1,
1098 N_("Add extra commentry to assembler output") },
1099 {"gnu-linker", &flag_gnu_linker, 1,
1100 N_("Output GNU ld formatted global initialisers") },
1101 {"regmove", &flag_regmove, 1,
1102 N_("Enables a register move optimisation") },
1103 {"optimize-register-move", &flag_regmove, 1,
1104 N_("Do the full regmove optimization pass") },
1105 {"pack-struct", &flag_pack_struct, 1,
1106 N_("Pack structure members together without holes") },
1107 {"stack-check", &flag_stack_check, 1,
1108 N_("Insert stack checking code into the program") },
1109 {"argument-alias", &flag_argument_noalias, 0,
1110 N_("Specify that arguments may alias each other & globals") },
1111 {"argument-noalias", &flag_argument_noalias, 1,
1112 N_("Assume arguments may alias globals but not each other") },
1113 {"argument-noalias-global", &flag_argument_noalias, 2,
1114 N_("Assume arguments do not alias each other or globals") },
1115 {"strict-aliasing", &flag_strict_aliasing, 1,
1116 N_("Assume strict aliasing rules apply") },
1117 {"align-loops", &align_loops, 0,
1118 N_("Align the start of loops") },
1119 {"align-jumps", &align_jumps, 0,
1120 N_("Align labels which are only reached by jumping") },
1121 {"align-labels", &align_labels, 0,
1122 N_("Align all labels") },
1123 {"align-functions", &align_functions, 0,
1124 N_("Align the start of functions") },
1125 {"merge-constants", &flag_merge_constants, 1,
1126 N_("Attempt to merge identical constants accross compilation units") },
1127 {"merge-all-constants", &flag_merge_constants, 2,
1128 N_("Attempt to merge identical constants and constant variables") },
1129 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1130 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1131 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1132 N_("Instrument function entry/exit with profiling calls") },
1133 {"ssa", &flag_ssa, 1,
1134 N_("Enable SSA optimizations") },
1135 {"ssa-ccp", &flag_ssa_ccp, 1,
1136 N_("Enable SSA conditional constant propagation") },
1137 {"ssa-dce", &flag_ssa_dce, 1,
1138 N_("Enable aggressive SSA dead code elimination") },
1139 {"leading-underscore", &flag_leading_underscore, 1,
1140 N_("External symbols have a leading underscore") },
1141 {"ident", &flag_no_ident, 0,
1142 N_("Process #ident directives") },
1143 { "peephole2", &flag_peephole2, 1,
1144 N_("Enables an rtl peephole pass run before sched2") },
1145 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1146 N_("Enables guessing of branch probabilities") },
1147 {"math-errno", &flag_errno_math, 1,
1148 N_("Set errno after built-in math functions") },
1149 {"trapping-math", &flag_trapping_math, 1,
1150 N_("Floating-point operations can trap") },
1151 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1152 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1153 {"bounded-pointers", &flag_bounded_pointers, 1,
1154 N_("Compile pointers as triples: value, base & end") },
1155 {"bounds-check", &flag_bounds_check, 1,
1156 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1157 {"single-precision-constant", &flag_single_precision_constant, 1,
1158 N_("Convert floating point constant to single precision constant") },
1159 {"time-report", &time_report, 1,
1160 N_("Report time taken by each compiler pass at end of run") },
1161 {"mem-report", &mem_report, 1,
1162 N_("Report on permanent memory allocation at end of run") },
1163 { "trapv", &flag_trapv, 1,
1164 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1167 /* Table of language-specific options. */
1169 static const struct lang_opt
1171 const char *const option;
1172 const char *const description;
1174 documented_lang_options[] =
1176 /* In order not to overload the --help output, the convention
1177 used here is to only describe those options which are not
1178 enabled by default. */
1181 N_("Compile just for ISO C89") },
1182 { "-fallow-single-precision",
1183 N_("Do not promote floats to double if using -traditional") },
1185 N_("Determine language standard") },
1187 { "-fsigned-bitfields", "" },
1188 { "-funsigned-bitfields",
1189 N_("Make bitfields by unsigned by default") },
1190 { "-fno-signed-bitfields", "" },
1191 { "-fno-unsigned-bitfields","" },
1193 N_("Make 'char' be signed by default") },
1194 { "-funsigned-char",
1195 N_("Make 'char' be unsigned by default") },
1196 { "-fno-signed-char", "" },
1197 { "-fno-unsigned-char", "" },
1199 { "-ftraditional", "" },
1201 N_("Attempt to support traditional K&R style C") },
1202 { "-fnotraditional", "" },
1203 { "-fno-traditional", "" },
1207 N_("Do not recognise the 'asm' keyword") },
1208 { "-fbuiltin", "" },
1210 N_("Do not recognise any built in functions") },
1212 N_("Assume normal C execution environment") },
1213 { "-fno-hosted", "" },
1215 N_("Assume that standard libraries & main might not exist") },
1216 { "-fno-freestanding", "" },
1217 { "-fcond-mismatch",
1218 N_("Allow different types as args of ? operator") },
1219 { "-fno-cond-mismatch", "" },
1220 { "-fdollars-in-identifiers",
1221 N_("Allow the use of $ inside identifiers") },
1222 { "-fno-dollars-in-identifiers", "" },
1223 { "-fpreprocessed", "" },
1224 { "-fno-preprocessed", "" },
1226 N_("Use the same size for double as for float") },
1227 { "-fno-short-double", "" },
1229 N_("Use the smallest fitting integer to hold enums") },
1230 { "-fno-short-enums", "" },
1232 N_("Override the underlying type for wchar_t to `unsigned short'") },
1233 { "-fno-short-wchar", "" },
1236 N_("Enable most warning messages") },
1237 { "-Wbad-function-cast",
1238 N_("Warn about casting functions to incompatible types") },
1239 { "-Wno-bad-function-cast", "" },
1240 { "-Wno-missing-noreturn", "" },
1241 { "-Wmissing-format-attribute",
1242 N_("Warn about functions which might be candidates for format attributes") },
1243 { "-Wno-missing-format-attribute", "" },
1245 N_("Warn about casts which discard qualifiers") },
1246 { "-Wno-cast-qual", "" },
1247 { "-Wchar-subscripts",
1248 N_("Warn about subscripts whose type is 'char'") },
1249 { "-Wno-char-subscripts", "" },
1251 N_("Warn if nested comments are detected") },
1252 { "-Wno-comment", "" },
1254 N_("Warn if nested comments are detected") },
1255 { "-Wno-comments", "" },
1257 N_("Warn about possibly confusing type conversions") },
1258 { "-Wno-conversion", "" },
1260 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1261 { "-Wno-format", "" },
1262 { "-Wformat-y2k", "" },
1263 { "-Wno-format-y2k",
1264 N_("Don't warn about strftime formats yielding 2 digit years") },
1265 { "-Wformat-extra-args", "" },
1266 { "-Wno-format-extra-args",
1267 N_("Don't warn about too many arguments to format functions") },
1268 { "-Wformat-nonliteral",
1269 N_("Warn about non-string-literal format strings") },
1270 { "-Wno-format-nonliteral", "" },
1271 { "-Wformat-security",
1272 N_("Warn about possible security problems with format functions") },
1273 { "-Wno-format-security", "" },
1274 { "-Wimplicit-function-declaration",
1275 N_("Warn about implicit function declarations") },
1276 { "-Wno-implicit-function-declaration", "" },
1277 { "-Werror-implicit-function-declaration", "" },
1279 N_("Warn when a declaration does not specify a type") },
1280 { "-Wno-implicit-int", "" },
1281 { "-Wimplicit", "" },
1282 { "-Wno-implicit", "" },
1284 N_("Warn about the use of the #import directive") },
1285 { "-Wno-import", "" },
1286 { "-Wlong-long","" },
1288 N_("Do not warn about using 'long long' when -pedantic") },
1290 N_("Warn about suspicious declarations of main") },
1291 { "-Wno-main", "" },
1292 { "-Wmissing-braces",
1293 N_("Warn about possibly missing braces around initialisers") },
1294 { "-Wno-missing-braces", "" },
1295 { "-Wmissing-declarations",
1296 N_("Warn about global funcs without previous declarations") },
1297 { "-Wno-missing-declarations", "" },
1298 { "-Wmissing-prototypes",
1299 N_("Warn about global funcs without prototypes") },
1300 { "-Wno-missing-prototypes", "" },
1302 N_("Warn about use of multicharacter literals") },
1303 { "-Wno-multichar", "" },
1304 { "-Wnested-externs",
1305 N_("Warn about externs not at file scope level") },
1306 { "-Wno-nested-externs", "" },
1308 N_("Warn about possible missing parentheses") },
1309 { "-Wno-parentheses", "" },
1310 { "-Wsequence-point",
1311 N_("Warn about possible violations of sequence point rules") },
1312 { "-Wno-sequence-point", "" },
1313 { "-Wpointer-arith",
1314 N_("Warn about function pointer arithmetic") },
1315 { "-Wno-pointer-arith", "" },
1316 { "-Wredundant-decls",
1317 N_("Warn about multiple declarations of the same object") },
1318 { "-Wno-redundant-decls", "" },
1320 N_("Warn about signed/unsigned comparisons") },
1321 { "-Wno-sign-compare", "" },
1323 N_("Warn about testing equality of floating point numbers") },
1324 { "-Wno-float-equal", "" },
1325 { "-Wunknown-pragmas",
1326 N_("Warn about unrecognized pragmas") },
1327 { "-Wno-unknown-pragmas", "" },
1328 { "-Wstrict-prototypes",
1329 N_("Warn about non-prototyped function decls") },
1330 { "-Wno-strict-prototypes", "" },
1332 N_("Warn about constructs whose meaning change in ISO C") },
1333 { "-Wno-traditional", "" },
1335 N_("Warn when trigraphs are encountered") },
1336 { "-Wno-trigraphs", "" },
1338 { "-Wno-undef", "" },
1339 { "-Wwrite-strings",
1340 N_("Mark strings as 'const char *'") },
1341 { "-Wno-write-strings", "" },
1343 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1345 #include "options.h"
1349 /* Here is a table, controlled by the tm.h file, listing each -m switch
1350 and which bits in `target_switches' it should set or clear.
1351 If VALUE is positive, it is bits to set.
1352 If VALUE is negative, -VALUE is bits to clear.
1353 (The sign bit is not used so there is no confusion.) */
1357 const char *const name;
1359 const char *const description;
1361 target_switches [] = TARGET_SWITCHES;
1363 /* This table is similar, but allows the switch to have a value. */
1365 #ifdef TARGET_OPTIONS
1368 const char *const prefix;
1369 const char **const variable;
1370 const char *const description;
1372 target_options [] = TARGET_OPTIONS;
1375 /* Options controlling warnings. */
1377 /* Don't print warning messages. -w. */
1379 int inhibit_warnings = 0;
1381 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1383 int warn_system_headers = 0;
1385 /* Print various extra warnings. -W. */
1387 int extra_warnings = 0;
1389 /* Treat warnings as errors. -Werror. */
1391 int warnings_are_errors = 0;
1393 /* Nonzero to warn about unused variables, functions et.al. */
1395 int warn_unused_function;
1396 int warn_unused_label;
1397 int warn_unused_parameter;
1398 int warn_unused_variable;
1399 int warn_unused_value;
1401 /* Nonzero to warn about code which is never reached. */
1403 int warn_notreached;
1405 /* Nonzero to warn about variables used before they are initialized. */
1407 int warn_uninitialized;
1409 /* Nonzero means warn about all declarations which shadow others. */
1413 /* Warn if a switch on an enum fails to have a case for every enum value. */
1417 /* Nonzero means warn about function definitions that default the return type
1418 or that use a null return and have a return-type other than void. */
1420 int warn_return_type;
1422 /* Nonzero means warn about pointer casts that increase the required
1423 alignment of the target type (and might therefore lead to a crash
1424 due to a misaligned access). */
1426 int warn_cast_align;
1428 /* Nonzero means warn about any objects definitions whose size is larger
1429 than N bytes. Also want about function definitions whose returned
1430 values are larger than N bytes. The value N is in `larger_than_size'. */
1432 int warn_larger_than;
1433 HOST_WIDE_INT larger_than_size;
1435 /* Nonzero means warn if inline function is too large. */
1439 /* Warn if a function returns an aggregate,
1440 since there are often incompatible calling conventions for doing this. */
1442 int warn_aggregate_return;
1444 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1448 /* Warn when gcc pads a structure to an alignment boundary. */
1452 /* Warn when an optimization pass is disabled. */
1454 int warn_disabled_optimization;
1456 /* Warn about functions which might be candidates for attribute noreturn. */
1458 int warn_missing_noreturn;
1460 /* Likewise for -W. */
1462 lang_independent_options W_options[] =
1464 {"unused-function", &warn_unused_function, 1,
1465 N_("Warn when a function is unused") },
1466 {"unused-label", &warn_unused_label, 1,
1467 N_("Warn when a label is unused") },
1468 {"unused-parameter", &warn_unused_parameter, 1,
1469 N_("Warn when a function parameter is unused") },
1470 {"unused-variable", &warn_unused_variable, 1,
1471 N_("Warn when a variable is unused") },
1472 {"unused-value", &warn_unused_value, 1,
1473 N_("Warn when an expression value is unused") },
1474 {"system-headers", &warn_system_headers, 1,
1475 N_("Do not suppress warnings from system headers") },
1476 {"error", &warnings_are_errors, 1,
1477 N_("Treat all warnings as errors") },
1478 {"shadow", &warn_shadow, 1,
1479 N_("Warn when one local variable shadows another") },
1480 {"switch", &warn_switch, 1,
1481 N_("Warn about enumerated switches missing a specific case") },
1482 {"aggregate-return", &warn_aggregate_return, 1,
1483 N_("Warn about returning structures, unions or arrays") },
1484 {"cast-align", &warn_cast_align, 1,
1485 N_("Warn about pointer casts which increase alignment") },
1486 {"unreachable-code", &warn_notreached, 1,
1487 N_("Warn about code that will never be executed") },
1488 {"uninitialized", &warn_uninitialized, 1,
1489 N_("Warn about uninitialized automatic variables") },
1490 {"inline", &warn_inline, 1,
1491 N_("Warn when an inlined function cannot be inlined") },
1492 {"packed", &warn_packed, 1,
1493 N_("Warn when the packed attribute has no effect on struct layout") },
1494 {"padded", &warn_padded, 1,
1495 N_("Warn when padding is required to align struct members") },
1496 {"disabled-optimization", &warn_disabled_optimization, 1,
1497 N_("Warn when an optimization pass is disabled") },
1498 {"missing-noreturn", &warn_missing_noreturn, 1,
1499 N_("Warn about functions which might be candidates for attribute noreturn") }
1503 set_Wunused (setting)
1506 warn_unused_function = setting;
1507 warn_unused_label = setting;
1508 /* Unused function parameter warnings are reported when either ``-W
1509 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1510 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1512 warn_unused_parameter = 0;
1513 else if (!warn_unused_parameter)
1514 warn_unused_parameter = -1;
1515 warn_unused_variable = setting;
1516 warn_unused_value = setting;
1519 /* The following routines are useful in setting all the flags that
1520 -ffast-math and -fno-fast-math imply. */
1523 set_fast_math_flags ()
1525 flag_trapping_math = 0;
1526 flag_unsafe_math_optimizations = 1;
1527 flag_errno_math = 0;
1531 set_no_fast_math_flags ()
1533 flag_trapping_math = 1;
1534 flag_unsafe_math_optimizations = 0;
1535 flag_errno_math = 1;
1539 /* Output files for assembler code (real compiler output)
1540 and debugging dumps. */
1543 FILE *aux_info_file;
1544 FILE *rtl_dump_file = NULL;
1546 /* Decode the string P as an integral parameter.
1547 If the string is indeed an integer return its numeric value else
1548 issue an Invalid Option error for the option PNAME and return DEFVAL.
1549 If PNAME is zero just return DEFVAL, do not call error. */
1552 read_integral_parameter (p, pname, defval)
1557 const char *endp = p;
1561 if (ISDIGIT (*endp))
1570 error ("invalid option `%s'", pname);
1578 /* This is the default decl_printable_name function. */
1581 decl_name (decl, verbosity)
1583 int verbosity ATTRIBUTE_UNUSED;
1585 return IDENTIFIER_POINTER (DECL_NAME (decl));
1589 /* This calls abort and is used to avoid problems when abort if a macro.
1590 It is used when we need to pass the address of abort. */
1598 /* When `malloc.c' is compiled with `rcheck' defined,
1599 it calls this function to report clobberage. */
1603 const char *s ATTRIBUTE_UNUSED;
1608 /* Return the logarithm of X, base 2, considering X unsigned,
1609 if X is a power of 2. Otherwise, returns -1.
1611 This should be used via the `exact_log2' macro. */
1615 unsigned HOST_WIDE_INT x;
1618 /* Test for 0 or a power of 2. */
1619 if (x == 0 || x != (x & -x))
1621 while ((x >>= 1) != 0)
1626 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1627 If X is 0, return -1.
1629 This should be used via the floor_log2 macro. */
1633 unsigned HOST_WIDE_INT x;
1642 static int float_handler_set;
1644 jmp_buf float_handler;
1646 /* Signals actually come here. */
1649 float_signal (signo)
1650 /* If this is missing, some compilers complain. */
1651 int signo ATTRIBUTE_UNUSED;
1653 if (float_handled == 0)
1654 crash_signal (signo);
1657 /* On System-V derived systems, we must reinstall the signal handler.
1658 This is harmless on BSD-derived systems. */
1659 signal (SIGFPE, float_signal);
1660 longjmp (float_handler, 1);
1663 /* Specify where to longjmp to when a floating arithmetic error happens.
1664 If HANDLER is 0, it means don't handle the errors any more. */
1667 set_float_handler (handler)
1670 float_handled = (handler != 0);
1672 memcpy (float_handler, handler, sizeof (float_handler));
1674 if (float_handled && ! float_handler_set)
1676 signal (SIGFPE, float_signal);
1677 float_handler_set = 1;
1681 /* This is a wrapper function for code which might elicit an
1682 arithmetic exception. That code should be passed in as a function
1683 pointer FN, and one argument DATA. DATA is usually a struct which
1684 contains the real input and output for function FN. This function
1685 returns 0 (failure) if longjmp was called (i.e. an exception
1686 occurred.) It returns 1 (success) otherwise. */
1689 do_float_handler (fn, data)
1690 void (*fn) PARAMS ((PTR));
1697 /* We got here via longjmp () caused by an exception in function
1699 set_float_handler (NULL);
1703 set_float_handler (buf);
1705 set_float_handler (NULL);
1709 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1710 into ICE messages, which is much more user friendly. */
1713 crash_signal (signo)
1716 internal_error ("internal error: %s", strsignal (signo));
1719 /* Strip off a legitimate source ending from the input string NAME of
1720 length LEN. Rather than having to know the names used by all of
1721 our front ends, we strip off an ending of a period followed by
1722 up to five characters. (Java uses ".class".) */
1725 strip_off_ending (name, len)
1730 for (i = 2; i < 6 && len > i; i++)
1732 if (name[len - i] == '.')
1734 name[len - i] = '\0';
1740 /* Output a quoted string. */
1743 output_quoted_string (asm_file, string)
1747 #ifdef OUTPUT_QUOTED_STRING
1748 OUTPUT_QUOTED_STRING (asm_file, string);
1752 putc ('\"', asm_file);
1753 while ((c = *string++) != 0)
1755 if (c == '\"' || c == '\\')
1756 putc ('\\', asm_file);
1759 putc ('\"', asm_file);
1763 /* Output a file name in the form wanted by System V. */
1766 output_file_directive (asm_file, input_name)
1768 const char *input_name;
1770 int len = strlen (input_name);
1771 const char *na = input_name + len;
1773 /* NA gets INPUT_NAME sans directory names. */
1774 while (na > input_name)
1776 if (IS_DIR_SEPARATOR (na[-1]))
1781 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1782 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1784 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1785 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1787 fprintf (asm_file, "\t.file\t");
1788 output_quoted_string (asm_file, na);
1789 fputc ('\n', asm_file);
1794 /* Routine to open a dump file. Return true if the dump file is enabled. */
1797 open_dump_file (index, decl)
1798 enum dump_file_index index;
1802 const char *open_arg;
1805 if (! dump_file[index].enabled)
1808 timevar_push (TV_DUMP);
1809 if (rtl_dump_file != NULL)
1810 fclose (rtl_dump_file);
1812 sprintf (seq, DUMPFILE_FORMAT, index);
1814 if (! dump_file[index].initialized)
1816 /* If we've not initialized the files, do so now. */
1817 if (graph_dump_format != no_graph
1818 && dump_file[index].graph_dump_p)
1820 dump_name = concat (seq, dump_file[index].extension, NULL);
1821 clean_graph_dump_file (dump_base_name, dump_name);
1824 dump_file[index].initialized = 1;
1830 dump_name = concat (dump_base_name, seq,
1831 dump_file[index].extension, NULL);
1833 rtl_dump_file = fopen (dump_name, open_arg);
1834 if (rtl_dump_file == NULL)
1835 fatal_io_error ("can't open %s", dump_name);
1840 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1841 decl_printable_name (decl, 2));
1843 timevar_pop (TV_DUMP);
1847 /* Routine to close a dump file. */
1850 close_dump_file (index, func, insns)
1851 enum dump_file_index index;
1852 void (*func) PARAMS ((FILE *, rtx));
1855 if (! rtl_dump_file)
1858 timevar_push (TV_DUMP);
1860 && graph_dump_format != no_graph
1861 && dump_file[index].graph_dump_p)
1866 sprintf (seq, DUMPFILE_FORMAT, index);
1867 suffix = concat (seq, dump_file[index].extension, NULL);
1868 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1873 func (rtl_dump_file, insns);
1875 fflush (rtl_dump_file);
1876 fclose (rtl_dump_file);
1878 rtl_dump_file = NULL;
1879 timevar_pop (TV_DUMP);
1882 /* Do any final processing required for the declarations in VEC, of
1883 which there are LEN. We write out inline functions and variables
1884 that have been deferred until this point, but which are required.
1885 Returns non-zero if anything was put out. */
1888 wrapup_global_declarations (vec, len)
1895 int output_something = 0;
1897 for (i = 0; i < len; i++)
1901 /* We're not deferring this any longer. */
1902 DECL_DEFER_OUTPUT (decl) = 0;
1904 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1905 && incomplete_decl_finalize_hook != 0)
1906 (*incomplete_decl_finalize_hook) (decl);
1909 /* Now emit any global variables or functions that we have been
1910 putting off. We need to loop in case one of the things emitted
1911 here references another one which comes earlier in the list. */
1915 for (i = 0; i < len; i++)
1919 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1922 /* Don't write out static consts, unless we still need them.
1924 We also keep static consts if not optimizing (for debugging),
1925 unless the user specified -fno-keep-static-consts.
1926 ??? They might be better written into the debug information.
1927 This is possible when using DWARF.
1929 A language processor that wants static constants to be always
1930 written out (even if it is not used) is responsible for
1931 calling rest_of_decl_compilation itself. E.g. the C front-end
1932 calls rest_of_decl_compilation from finish_decl.
1933 One motivation for this is that is conventional in some
1934 environments to write things like:
1935 static const char rcsid[] = "... version string ...";
1936 intending to force the string to be in the executable.
1938 A language processor that would prefer to have unneeded
1939 static constants "optimized away" would just defer writing
1940 them out until here. E.g. C++ does this, because static
1941 constants are often defined in header files.
1943 ??? A tempting alternative (for both C and C++) would be
1944 to force a constant to be written if and only if it is
1945 defined in a main file, as opposed to an include file. */
1947 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1948 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl))
1949 && !DECL_COMDAT (decl))
1951 && flag_keep_static_consts
1952 && !DECL_ARTIFICIAL (decl))
1953 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1956 rest_of_decl_compilation (decl, NULL, 1, 1);
1959 if (TREE_CODE (decl) == FUNCTION_DECL
1960 && DECL_INITIAL (decl) != 0
1961 && DECL_SAVED_INSNS (decl) != 0
1962 && (flag_keep_inline_functions
1963 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1964 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1967 output_inline_function (decl);
1972 output_something = 1;
1976 return output_something;
1979 /* Issue appropriate warnings for the global declarations in VEC (of
1980 which there are LEN). Output debugging information for them. */
1983 check_global_declarations (vec, len)
1990 for (i = 0; i < len; i++)
1994 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1995 && ! TREE_ASM_WRITTEN (decl))
1996 /* Cancel the RTL for this decl so that, if debugging info
1997 output for global variables is still to come,
1998 this one will be omitted. */
1999 SET_DECL_RTL (decl, NULL_RTX);
2001 /* Warn about any function
2002 declared static but not defined.
2003 We don't warn about variables,
2004 because many programs have static variables
2005 that exist only to get some text into the object file. */
2006 if (TREE_CODE (decl) == FUNCTION_DECL
2007 && (warn_unused_function
2008 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2009 && DECL_INITIAL (decl) == 0
2010 && DECL_EXTERNAL (decl)
2011 && ! DECL_ARTIFICIAL (decl)
2012 && ! TREE_PUBLIC (decl))
2014 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2015 pedwarn_with_decl (decl,
2016 "`%s' used but never defined");
2018 warning_with_decl (decl,
2019 "`%s' declared `static' but never defined");
2020 /* This symbol is effectively an "extern" declaration now. */
2021 TREE_PUBLIC (decl) = 1;
2022 assemble_external (decl);
2025 /* Warn about static fns or vars defined but not used,
2026 but not about inline functions or static consts
2027 since defining those in header files is normal practice. */
2028 if (((warn_unused_function
2029 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2030 || (warn_unused_variable
2031 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2032 && ! DECL_IN_SYSTEM_HEADER (decl)
2033 && ! DECL_EXTERNAL (decl)
2034 && ! TREE_PUBLIC (decl)
2035 && ! TREE_USED (decl)
2036 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2037 /* The TREE_USED bit for file-scope decls
2038 is kept in the identifier, to handle multiple
2039 external decls in different scopes. */
2040 && ! TREE_USED (DECL_NAME (decl)))
2041 warning_with_decl (decl, "`%s' defined but not used");
2043 timevar_push (TV_SYMOUT);
2044 (*debug_hooks->global_decl) (decl);
2045 timevar_pop (TV_SYMOUT);
2049 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2050 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2051 INPUT_FILENAME and LINENO accordingly. */
2054 push_srcloc (file, line)
2058 struct file_stack *fs;
2060 if (input_file_stack)
2062 input_file_stack->name = input_filename;
2063 input_file_stack->line = lineno;
2066 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2067 fs->name = input_filename = file;
2068 fs->line = lineno = line;
2069 fs->indent_level = 0;
2070 fs->next = input_file_stack;
2071 input_file_stack = fs;
2072 input_file_stack_tick++;
2075 /* Pop the top entry off the stack of presently open source files.
2076 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2082 struct file_stack *fs;
2084 fs = input_file_stack;
2085 input_file_stack = fs->next;
2087 input_file_stack_tick++;
2088 /* The initial source file is never popped. */
2089 if (!input_file_stack)
2091 input_filename = input_file_stack->name;
2092 lineno = input_file_stack->line;
2095 /* Compile an entire translation unit. Write a file of assembly
2096 output and various debugging dumps. */
2103 /* Initialize yet another pass. */
2105 init_final (main_input_filename);
2106 init_branch_prob (dump_base_name);
2108 timevar_push (TV_PARSE);
2110 /* Call the parser, which parses the entire file
2111 (calling rest_of_compilation for each function). */
2114 /* In case there were missing block closers,
2115 get us back to the global binding level. */
2116 (*lang_hooks.clear_binding_stack) ();
2118 /* Compilation is now finished except for writing
2119 what's left of the symbol table output. */
2121 timevar_pop (TV_PARSE);
2123 if (flag_syntax_only)
2126 globals = getdecls ();
2128 /* Really define vars that have had only a tentative definition.
2129 Really output inline functions that must actually be callable
2130 and have not been output so far. */
2133 int len = list_length (globals);
2134 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2138 /* Process the decls in reverse order--earliest first.
2139 Put them into VEC from back to front, then take out from front. */
2141 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2142 vec[len - i - 1] = decl;
2144 wrapup_global_declarations (vec, len);
2146 /* This must occur after the loop to output deferred functions. Else
2147 the profiler initializer would not be emitted if all the functions
2148 in this compilation unit were deferred.
2150 output_func_start_profiler can not cause any additional functions or
2151 data to need to be output, so it need not be in the deferred function
2153 output_func_start_profiler ();
2155 check_global_declarations (vec, len);
2161 /* Write out any pending weak symbol declarations. */
2165 /* Do dbx symbols. */
2166 timevar_push (TV_SYMOUT);
2168 #ifdef DWARF2_UNWIND_INFO
2169 if (dwarf2out_do_frame ())
2170 dwarf2out_frame_finish ();
2173 (*debug_hooks->finish) (main_input_filename);
2174 timevar_pop (TV_SYMOUT);
2176 /* Output some stuff at end of file if nec. */
2178 dw2_output_indirect_constants ();
2180 end_final (dump_base_name);
2182 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2184 timevar_push (TV_DUMP);
2185 open_dump_file (DFI_bp, NULL);
2189 close_dump_file (DFI_bp, NULL, NULL_RTX);
2190 timevar_pop (TV_DUMP);
2194 ASM_FILE_END (asm_out_file);
2197 /* Attach a special .ident directive to the end of the file to identify
2198 the version of GCC which compiled this code. The format of the .ident
2199 string is patterned after the ones produced by native SVR4 compilers. */
2202 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2203 IDENT_ASM_OP, version_string);
2206 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2208 timevar_push (TV_DUMP);
2209 dump_combine_total_stats (rtl_dump_file);
2210 close_dump_file (DFI_combine, NULL, NULL_RTX);
2211 timevar_pop (TV_DUMP);
2215 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2216 and TYPE_DECL nodes.
2218 This does nothing for local (non-static) variables, unless the
2219 variable is a register variable with an ASMSPEC. In that case, or
2220 if the variable is not an automatic, it sets up the RTL and
2221 outputs any assembler code (label definition, storage allocation
2222 and initialization).
2224 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2225 the assembler symbol name to be used. TOP_LEVEL is nonzero
2226 if this declaration is not within a function. */
2229 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2231 const char *asmspec;
2235 /* Declarations of variables, and of functions defined elsewhere. */
2237 /* The most obvious approach, to put an #ifndef around where
2238 this macro is used, doesn't work since it's inside a macro call. */
2239 #ifndef ASM_FINISH_DECLARE_OBJECT
2240 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2243 /* Forward declarations for nested functions are not "external",
2244 but we need to treat them as if they were. */
2245 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2246 || TREE_CODE (decl) == FUNCTION_DECL)
2248 timevar_push (TV_VARCONST);
2250 make_decl_rtl (decl, asmspec);
2251 /* Don't output anything
2252 when a tentative file-scope definition is seen.
2253 But at end of compilation, do output code for them. */
2254 if (at_end || !DECL_DEFER_OUTPUT (decl))
2255 assemble_variable (decl, top_level, at_end, 0);
2256 if (decl == last_assemble_variable_decl)
2258 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2261 timevar_pop (TV_VARCONST);
2263 else if (DECL_REGISTER (decl) && asmspec != 0)
2265 if (decode_reg_name (asmspec) >= 0)
2267 SET_DECL_RTL (decl, NULL_RTX);
2268 make_decl_rtl (decl, asmspec);
2272 error ("invalid register name `%s' for register variable", asmspec);
2273 DECL_REGISTER (decl) = 0;
2278 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2279 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2280 && TREE_CODE (decl) == TYPE_DECL)
2282 timevar_push (TV_SYMOUT);
2283 dbxout_symbol (decl, 0);
2284 timevar_pop (TV_SYMOUT);
2287 #ifdef SDB_DEBUGGING_INFO
2288 else if (write_symbols == SDB_DEBUG && top_level
2289 && TREE_CODE (decl) == TYPE_DECL)
2291 timevar_push (TV_SYMOUT);
2292 sdbout_symbol (decl, 0);
2293 timevar_pop (TV_SYMOUT);
2298 /* Called after finishing a record, union or enumeral type. */
2301 rest_of_type_compilation (type, toplev)
2302 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2306 tree type ATTRIBUTE_UNUSED;
2307 int toplev ATTRIBUTE_UNUSED;
2310 timevar_push (TV_SYMOUT);
2311 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2312 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2313 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2315 #ifdef SDB_DEBUGGING_INFO
2316 if (write_symbols == SDB_DEBUG)
2317 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2319 #ifdef DWARF2_DEBUGGING_INFO
2320 if ((write_symbols == DWARF2_DEBUG
2321 || write_symbols == VMS_AND_DWARF2_DEBUG)
2323 dwarf2out_decl (TYPE_STUB_DECL (type));
2325 timevar_pop (TV_SYMOUT);
2328 /* This is called from finish_function (within yyparse)
2329 after each top-level definition is parsed.
2330 It is supposed to compile that function or variable
2331 and output the assembler code for it.
2332 After we return, the tree storage is freed. */
2335 rest_of_compilation (decl)
2341 int rebuild_label_notes_after_reload;
2342 int register_life_up_to_date;
2344 timevar_push (TV_REST_OF_COMPILATION);
2346 /* Now that we're out of the frontend, we shouldn't have any more
2347 CONCATs anywhere. */
2348 generating_concat_p = 0;
2350 /* When processing delayed functions, prepare_function_start() won't
2351 have been run to re-initialize it. */
2352 cse_not_expected = ! optimize;
2354 /* First, make sure that NOTE_BLOCK is set correctly for each
2355 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2356 if (!cfun->x_whole_function_mode_p)
2359 /* Then remove any notes we don't need. That will make iterating
2360 over the instruction sequence faster, and allow the garbage
2361 collector to reclaim the memory used by the notes. */
2362 remove_unnecessary_notes ();
2364 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2365 tree in sensible shape. So, we just recalculate it here. */
2366 if (cfun->x_whole_function_mode_p)
2371 /* If we are reconsidering an inline function
2372 at the end of compilation, skip the stuff for making it inline. */
2374 if (DECL_SAVED_INSNS (decl) == 0)
2380 /* If this is nested inside an inlined external function, pretend
2381 it was only declared. Since we cannot inline such functions,
2382 generating code for this one is not only not necessary but will
2383 confuse some debugging output writers. */
2384 for (parent = DECL_CONTEXT (current_function_decl);
2385 parent != NULL_TREE;
2386 parent = get_containing_scope (parent))
2387 if (TREE_CODE (parent) == FUNCTION_DECL
2388 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2390 DECL_INITIAL (decl) = 0;
2391 goto exit_rest_of_compilation;
2394 /* If requested, consider whether to make this function inline. */
2395 if ((DECL_INLINE (decl) && !flag_no_inline)
2396 || flag_inline_functions)
2398 timevar_push (TV_INTEGRATION);
2399 lose = function_cannot_inline_p (decl);
2400 timevar_pop (TV_INTEGRATION);
2401 if (lose || ! optimize)
2403 if (warn_inline && DECL_INLINE (decl))
2404 warning_with_decl (decl, lose);
2405 DECL_ABSTRACT_ORIGIN (decl) = 0;
2406 /* Don't really compile an extern inline function.
2407 If we can't make it inline, pretend
2408 it was only declared. */
2409 if (DECL_EXTERNAL (decl))
2411 DECL_INITIAL (decl) = 0;
2412 goto exit_rest_of_compilation;
2416 /* ??? Note that this has the effect of making it look
2417 like "inline" was specified for a function if we choose
2418 to inline it. This isn't quite right, but it's
2419 probably not worth the trouble to fix. */
2420 inlinable = DECL_INLINE (decl) = 1;
2423 insns = get_insns ();
2425 /* Dump the rtl code if we are dumping rtl. */
2427 if (open_dump_file (DFI_rtl, decl))
2429 if (DECL_SAVED_INSNS (decl))
2430 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2431 close_dump_file (DFI_rtl, print_rtl, insns);
2434 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2435 sorts of eh initialization. Delay this until after the
2436 initial rtl dump so that we can see the original nesting. */
2437 convert_from_eh_region_ranges ();
2439 /* If function is inline, and we don't yet know whether to
2440 compile it by itself, defer decision till end of compilation.
2441 finish_compilation will call rest_of_compilation again
2442 for those functions that need to be output. Also defer those
2443 functions that we are supposed to defer. */
2446 || (DECL_INLINE (decl)
2447 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2448 && ! flag_keep_inline_functions)
2449 || DECL_EXTERNAL (decl))))
2450 DECL_DEFER_OUTPUT (decl) = 1;
2452 if (DECL_INLINE (decl))
2453 /* DWARF wants separate debugging info for abstract and
2454 concrete instances of all inline functions, including those
2455 declared inline but not inlined, and those inlined even
2456 though they weren't declared inline. Conveniently, that's
2457 what DECL_INLINE means at this point. */
2458 (*debug_hooks->deferred_inline_function) (decl);
2460 if (DECL_DEFER_OUTPUT (decl))
2462 /* If -Wreturn-type, we have to do a bit of compilation. We just
2463 want to call cleanup the cfg to figure out whether or not we can
2464 fall off the end of the function; we do the minimum amount of
2465 work necessary to make that safe. */
2466 if (warn_return_type)
2468 int saved_optimize = optimize;
2471 rebuild_jump_labels (insns);
2472 find_exception_handler_labels ();
2473 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2474 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2475 optimize = saved_optimize;
2477 /* CFG is no longer maintained up-to-date. */
2478 free_bb_for_insn ();
2481 current_function_nothrow = nothrow_function_p ();
2482 if (current_function_nothrow)
2483 /* Now we know that this can't throw; set the flag for the benefit
2484 of other functions later in this translation unit. */
2485 TREE_NOTHROW (current_function_decl) = 1;
2487 timevar_push (TV_INTEGRATION);
2488 save_for_inline (decl);
2489 timevar_pop (TV_INTEGRATION);
2490 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2491 goto exit_rest_of_compilation;
2494 /* If specified extern inline but we aren't inlining it, we are
2495 done. This goes for anything that gets here with DECL_EXTERNAL
2496 set, not just things with DECL_INLINE. */
2497 if (DECL_EXTERNAL (decl))
2498 goto exit_rest_of_compilation;
2503 /* Initialize some variables used by the optimizers. */
2504 init_function_for_compilation ();
2506 if (! DECL_DEFER_OUTPUT (decl))
2507 TREE_ASM_WRITTEN (decl) = 1;
2509 /* Now that integrate will no longer see our rtl, we need not
2510 distinguish between the return value of this function and the
2511 return value of called functions. Also, we can remove all SETs
2512 of subregs of hard registers; they are only here because of
2513 integrate. Also, we can now initialize pseudos intended to
2514 carry magic hard reg data throughout the function. */
2515 rtx_equal_function_value_matters = 0;
2516 purge_hard_subreg_sets (get_insns ());
2517 emit_initial_value_sets ();
2519 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2520 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2521 goto exit_rest_of_compilation;
2523 /* We may have potential sibling or tail recursion sites. Select one
2524 (of possibly multiple) methods of performing the call. */
2525 if (flag_optimize_sibling_calls)
2527 timevar_push (TV_JUMP);
2528 open_dump_file (DFI_sibling, decl);
2530 optimize_sibling_and_tail_recursive_calls ();
2532 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2533 timevar_pop (TV_JUMP);
2536 /* Complete generation of exception handling code. */
2537 find_exception_handler_labels ();
2540 timevar_push (TV_JUMP);
2541 open_dump_file (DFI_eh, decl);
2543 finish_eh_generation ();
2545 close_dump_file (DFI_eh, print_rtl, get_insns ());
2546 timevar_pop (TV_JUMP);
2550 /* If we are doing position-independent code generation, now
2551 is the time to output special prologues and epilogues.
2552 We do not want to do this earlier, because it just clutters
2553 up inline functions with meaningless insns. */
2558 insns = get_insns ();
2560 /* Copy any shared structure that should not be shared. */
2561 unshare_all_rtl (current_function_decl, insns);
2563 #ifdef SETJMP_VIA_SAVE_AREA
2564 /* This must be performed before virtual register instantiation. */
2565 if (current_function_calls_alloca)
2566 optimize_save_area_alloca (insns);
2569 /* Instantiate all virtual registers. */
2570 instantiate_virtual_regs (current_function_decl, insns);
2572 open_dump_file (DFI_jump, decl);
2574 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2575 are initialized and to compute whether control can drop off the end
2578 timevar_push (TV_JUMP);
2579 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2580 before jump optimization switches branch directions. */
2581 expected_value_to_br_prob ();
2583 reg_scan (insns, max_reg_num (), 0);
2584 rebuild_jump_labels (insns);
2585 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2586 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP);
2588 /* CFG is no longer maintained up-to-date. */
2589 free_bb_for_insn ();
2590 copy_loop_headers (insns);
2591 purge_line_number_notes (insns);
2593 timevar_pop (TV_JUMP);
2595 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2596 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2598 close_dump_file (DFI_jump, print_rtl, insns);
2599 goto exit_rest_of_compilation;
2602 /* Long term, this should probably move before the jump optimizer too,
2603 but I didn't want to disturb the rtl_dump_and_exit and related
2604 stuff at this time. */
2605 if (optimize > 0 && flag_ssa)
2607 /* Convert to SSA form. */
2609 timevar_push (TV_TO_SSA);
2610 open_dump_file (DFI_ssa, decl);
2612 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2613 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2616 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2617 timevar_pop (TV_TO_SSA);
2619 /* Perform sparse conditional constant propagation, if requested. */
2622 timevar_push (TV_SSA_CCP);
2623 open_dump_file (DFI_ssa_ccp, decl);
2627 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2628 timevar_pop (TV_SSA_CCP);
2631 /* It would be useful to cleanup the CFG at this point, but block
2632 merging and possibly other transformations might leave a PHI
2633 node in the middle of a basic block, which is a strict no-no. */
2635 /* The SSA implementation uses basic block numbers in its phi
2636 nodes. Thus, changing the control-flow graph or the basic
2637 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2638 may cause problems. */
2642 /* Remove dead code. */
2644 timevar_push (TV_SSA_DCE);
2645 open_dump_file (DFI_ssa_dce, decl);
2647 insns = get_insns ();
2648 ssa_eliminate_dead_code();
2650 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2651 timevar_pop (TV_SSA_DCE);
2654 /* Convert from SSA form. */
2656 timevar_push (TV_FROM_SSA);
2657 open_dump_file (DFI_ussa, decl);
2659 convert_from_ssa ();
2660 /* New registers have been created. Rescan their usage. */
2661 reg_scan (insns, max_reg_num (), 1);
2663 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2664 timevar_pop (TV_FROM_SSA);
2667 /* CFG is no longer maintained up-to-date. */
2668 free_bb_for_insn ();
2671 timevar_push (TV_JUMP);
2675 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2676 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2678 /* ??? Run if-conversion before delete_null_pointer_checks,
2679 since the later does not preserve the CFG. This should
2680 be changed -- no since converting if's that are going to
2682 timevar_push (TV_IFCVT);
2684 timevar_pop (TV_IFCVT);
2686 /* CFG is no longer maintained up-to-date. */
2687 free_bb_for_insn ();
2688 /* Try to identify useless null pointer tests and delete them. */
2689 if (flag_delete_null_pointer_checks)
2690 delete_null_pointer_checks (insns);
2693 /* Jump optimization, and the removal of NULL pointer checks, may
2694 have reduced the number of instructions substantially. CSE, and
2695 future passes, allocate arrays whose dimensions involve the
2696 maximum instruction UID, so if we can reduce the maximum UID
2697 we'll save big on memory. */
2698 renumber_insns (rtl_dump_file);
2699 timevar_pop (TV_JUMP);
2701 close_dump_file (DFI_jump, print_rtl, insns);
2705 /* Perform common subexpression elimination.
2706 Nonzero value from `cse_main' means that jumps were simplified
2707 and some code may now be unreachable, so do
2708 jump optimization again. */
2712 open_dump_file (DFI_cse, decl);
2713 timevar_push (TV_CSE);
2715 reg_scan (insns, max_reg_num (), 1);
2717 if (flag_thread_jumps)
2719 timevar_push (TV_JUMP);
2720 thread_jumps (insns, max_reg_num (), 1);
2721 timevar_pop (TV_JUMP);
2724 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2726 /* If we are not running more CSE passes, then we are no longer
2727 expecting CSE to be run. But always rerun it in a cheap mode. */
2728 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2730 if (tem || optimize > 1)
2732 timevar_push (TV_JUMP);
2733 rebuild_jump_labels (insns);
2734 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2735 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2736 timevar_pop (TV_JUMP);
2737 /* CFG is no longer maintained up-to-date. */
2738 free_bb_for_insn ();
2741 /* Run this after jump optmizations remove all the unreachable code
2742 so that unreachable code will not keep values live. */
2743 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2745 /* Try to identify useless null pointer tests and delete them. */
2746 if (flag_delete_null_pointer_checks)
2748 timevar_push (TV_JUMP);
2749 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2751 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2753 delete_null_pointer_checks (insns);
2754 /* CFG is no longer maintained up-to-date. */
2755 free_bb_for_insn ();
2756 timevar_pop (TV_JUMP);
2759 /* The second pass of jump optimization is likely to have
2760 removed a bunch more instructions. */
2761 renumber_insns (rtl_dump_file);
2763 timevar_pop (TV_CSE);
2764 close_dump_file (DFI_cse, print_rtl, insns);
2767 open_dump_file (DFI_addressof, decl);
2769 purge_addressof (insns);
2770 reg_scan (insns, max_reg_num (), 1);
2772 close_dump_file (DFI_addressof, print_rtl, insns);
2776 /* Perform global cse. */
2778 if (optimize > 0 && flag_gcse)
2780 int save_csb, save_cfj;
2783 timevar_push (TV_GCSE);
2784 open_dump_file (DFI_gcse, decl);
2786 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2787 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2788 tem = gcse_main (insns, rtl_dump_file);
2790 save_csb = flag_cse_skip_blocks;
2791 save_cfj = flag_cse_follow_jumps;
2792 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2794 /* CFG is no longer maintained up-to-date. */
2795 free_bb_for_insn ();
2796 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2798 if (flag_expensive_optimizations)
2800 timevar_push (TV_CSE);
2801 reg_scan (insns, max_reg_num (), 1);
2802 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2803 timevar_pop (TV_CSE);
2804 cse_not_expected = !flag_rerun_cse_after_loop;
2807 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2808 things up. Then possibly re-run CSE again. */
2812 timevar_push (TV_JUMP);
2813 rebuild_jump_labels (insns);
2814 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2815 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2816 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2817 /* CFG is no longer maintained up-to-date. */
2818 free_bb_for_insn ();
2819 timevar_pop (TV_JUMP);
2821 if (flag_expensive_optimizations)
2823 timevar_push (TV_CSE);
2824 reg_scan (insns, max_reg_num (), 1);
2825 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2826 timevar_pop (TV_CSE);
2830 close_dump_file (DFI_gcse, print_rtl, insns);
2831 timevar_pop (TV_GCSE);
2834 flag_cse_skip_blocks = save_csb;
2835 flag_cse_follow_jumps = save_cfj;
2838 /* Move constant computations out of loops. */
2842 timevar_push (TV_LOOP);
2843 open_dump_file (DFI_loop, decl);
2844 free_bb_for_insn ();
2846 if (flag_rerun_loop_opt)
2848 cleanup_barriers ();
2850 /* We only want to perform unrolling once. */
2852 loop_optimize (insns, rtl_dump_file, 0);
2854 /* The first call to loop_optimize makes some instructions
2855 trivially dead. We delete those instructions now in the
2856 hope that doing so will make the heuristics in loop work
2857 better and possibly speed up compilation. */
2858 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2860 /* The regscan pass is currently necessary as the alias
2861 analysis code depends on this information. */
2862 reg_scan (insns, max_reg_num (), 1);
2864 cleanup_barriers ();
2865 loop_optimize (insns, rtl_dump_file,
2866 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT);
2868 close_dump_file (DFI_loop, print_rtl, insns);
2869 timevar_pop (TV_LOOP);
2876 timevar_push (TV_CSE2);
2877 open_dump_file (DFI_cse2, decl);
2879 if (flag_rerun_cse_after_loop)
2881 /* Running another jump optimization pass before the second
2882 cse pass sometimes simplifies the RTL enough to allow
2883 the second CSE pass to do a better job. Jump_optimize can change
2884 max_reg_num so we must rerun reg_scan afterwards.
2885 ??? Rework to not call reg_scan so often. */
2886 timevar_push (TV_JUMP);
2888 /* The previous call to loop_optimize makes some instructions
2889 trivially dead. We delete those instructions now in the
2890 hope that doing so will make the heuristics in jump work
2891 better and possibly speed up compilation. */
2892 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2894 reg_scan (insns, max_reg_num (), 0);
2896 timevar_push (TV_IFCVT);
2898 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2899 cleanup_cfg (CLEANUP_EXPENSIVE);
2902 timevar_pop(TV_IFCVT);
2904 timevar_pop (TV_JUMP);
2906 /* CFG is no longer maintained up-to-date. */
2907 free_bb_for_insn ();
2908 reg_scan (insns, max_reg_num (), 0);
2909 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2913 timevar_push (TV_JUMP);
2914 rebuild_jump_labels (insns);
2915 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2916 cleanup_cfg (CLEANUP_EXPENSIVE);
2917 /* CFG is no longer maintained up-to-date. */
2918 free_bb_for_insn ();
2919 timevar_pop (TV_JUMP);
2923 if (flag_thread_jumps)
2925 /* This pass of jump threading straightens out code
2926 that was kinked by loop optimization. */
2927 timevar_push (TV_JUMP);
2928 reg_scan (insns, max_reg_num (), 0);
2929 thread_jumps (insns, max_reg_num (), 0);
2930 timevar_pop (TV_JUMP);
2933 close_dump_file (DFI_cse2, print_rtl, insns);
2934 timevar_pop (TV_CSE2);
2939 cse_not_expected = 1;
2943 /* Do control and data flow analysis; wrote some of the results to
2946 timevar_push (TV_FLOW);
2947 open_dump_file (DFI_cfg, decl);
2949 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2950 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
2951 check_function_return_warnings ();
2953 /* It may make more sense to mark constant functions after dead code is
2954 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2955 may insert code making function non-constant, but we still must consider
2956 it as constant, otherwise -fbranch-probabilities will not read data back.
2958 life_analyzis rarely eliminates modification of external memory.
2960 mark_constant_function ();
2962 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2964 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2966 timevar_push (TV_BRANCH_PROB);
2967 open_dump_file (DFI_bp, decl);
2971 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2972 timevar_pop (TV_BRANCH_PROB);
2975 open_dump_file (DFI_life, decl);
2980 /* Discover and record the loop depth at the head of each basic
2981 block. The loop infrastructure does the real job for us. */
2982 flow_loops_find (&loops, LOOP_TREE);
2984 /* Estimate using heuristics if no profiling info is available. */
2985 if (flag_guess_branch_prob)
2986 estimate_probability (&loops);
2989 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2991 flow_loops_free (&loops);
2993 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2994 timevar_pop (TV_FLOW);
2998 if (warn_uninitialized || extra_warnings)
3000 uninitialized_vars_warning (DECL_INITIAL (decl));
3002 setjmp_args_warning ();
3007 if (initialize_uninitialized_subregs ())
3009 /* Insns were inserted, so things might look a bit different. */
3010 insns = get_insns();
3011 life_analysis (insns, rtl_dump_file,
3012 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES));
3016 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3020 /* If -opt, try combining insns through substitution. */
3024 int rebuild_jump_labels_after_combine = 0;
3026 timevar_push (TV_COMBINE);
3027 open_dump_file (DFI_combine, decl);
3029 rebuild_jump_labels_after_combine
3030 = combine_instructions (insns, max_reg_num ());
3032 /* Always purge dead edges, as we may eliminate an insn throwing
3034 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true);
3036 /* Combining insns may have turned an indirect jump into a
3037 direct jump. Rebuid the JUMP_LABEL fields of jumping
3039 if (rebuild_jump_labels_after_combine)
3041 timevar_push (TV_JUMP);
3042 rebuild_jump_labels (insns);
3043 timevar_pop (TV_JUMP);
3045 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3048 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3049 timevar_pop (TV_COMBINE);
3054 /* Rerun if-conversion, as combine may have simplified things enough to
3055 now meet sequence length restrictions. */
3058 timevar_push (TV_IFCVT);
3059 open_dump_file (DFI_ce, decl);
3065 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3066 timevar_pop (TV_IFCVT);
3069 /* Register allocation pre-pass, to reduce number of moves
3070 necessary for two-address machines. */
3071 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3073 timevar_push (TV_REGMOVE);
3074 open_dump_file (DFI_regmove, decl);
3076 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3078 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3079 timevar_pop (TV_REGMOVE);
3084 /* Do unconditional splitting before register allocation to allow machine
3085 description to add extra information not needed previously. */
3086 split_all_insns (1);
3088 /* Any of the several passes since flow1 will have munged register
3089 lifetime data a bit. */
3090 register_life_up_to_date = 0;
3092 #ifdef OPTIMIZE_MODE_SWITCHING
3093 timevar_push (TV_MODE_SWITCH);
3096 if (optimize_mode_switching (NULL))
3098 /* We did work, and so had to regenerate global life information.
3099 Take advantage of this and don't re-recompute register life
3100 information below. */
3101 register_life_up_to_date = 1;
3105 timevar_pop (TV_MODE_SWITCH);
3108 timevar_push (TV_SCHED);
3110 #ifdef INSN_SCHEDULING
3112 /* Print function header into sched dump now
3113 because doing the sched analysis makes some of the dump. */
3114 if (optimize > 0 && flag_schedule_insns)
3116 open_dump_file (DFI_sched, decl);
3118 /* Do control and data sched analysis,
3119 and write some of the results to dump file. */
3121 schedule_insns (rtl_dump_file);
3123 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3125 /* Register lifetime information was updated as part of verifying
3127 register_life_up_to_date = 1;
3130 timevar_pop (TV_SCHED);
3134 /* Determine if the current function is a leaf before running reload
3135 since this can impact optimizations done by the prologue and
3136 epilogue thus changing register elimination offsets. */
3137 current_function_is_leaf = leaf_function_p ();
3139 timevar_push (TV_LOCAL_ALLOC);
3140 open_dump_file (DFI_lreg, decl);
3142 /* Allocate pseudo-regs that are used only within 1 basic block.
3144 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3145 jump optimizer after register allocation and reloading are finished. */
3147 if (! register_life_up_to_date)
3148 recompute_reg_usage (insns, ! optimize_size);
3150 /* Allocate the reg_renumber array. */
3151 allocate_reg_info (max_regno, FALSE, TRUE);
3153 /* And the reg_equiv_memory_loc array. */
3154 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3156 allocate_initial_values (reg_equiv_memory_loc);
3158 regclass (insns, max_reg_num (), rtl_dump_file);
3159 rebuild_label_notes_after_reload = local_alloc ();
3161 timevar_pop (TV_LOCAL_ALLOC);
3163 if (dump_file[DFI_lreg].enabled)
3165 timevar_push (TV_DUMP);
3167 dump_flow_info (rtl_dump_file);
3168 dump_local_alloc (rtl_dump_file);
3170 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3171 timevar_pop (TV_DUMP);
3176 timevar_push (TV_GLOBAL_ALLOC);
3177 open_dump_file (DFI_greg, decl);
3179 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3180 pass fixing up any insns that are invalid. */
3183 failure = global_alloc (rtl_dump_file);
3186 build_insn_chain (insns);
3187 failure = reload (insns, 0);
3190 timevar_pop (TV_GLOBAL_ALLOC);
3192 if (dump_file[DFI_greg].enabled)
3194 timevar_push (TV_DUMP);
3196 dump_global_regs (rtl_dump_file);
3198 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3199 timevar_pop (TV_DUMP);
3203 goto exit_rest_of_compilation;
3207 open_dump_file (DFI_postreload, decl);
3209 /* Do a very simple CSE pass over just the hard registers. */
3212 timevar_push (TV_RELOAD_CSE_REGS);
3213 reload_cse_regs (insns);
3214 timevar_pop (TV_RELOAD_CSE_REGS);
3217 /* Register allocation and reloading may have turned an indirect jump into
3218 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3219 jumping instructions. */
3220 if (rebuild_label_notes_after_reload)
3222 timevar_push (TV_JUMP);
3224 rebuild_jump_labels (insns);
3226 timevar_pop (TV_JUMP);
3229 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3231 /* Re-create the death notes which were deleted during reload. */
3232 timevar_push (TV_FLOW2);
3233 open_dump_file (DFI_flow2, decl);
3235 #ifdef ENABLE_CHECKING
3236 verify_flow_info ();
3239 /* If optimizing, then go ahead and split insns now. */
3241 split_all_insns (0);
3243 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3245 /* On some machines, the prologue and epilogue code, or parts thereof,
3246 can be represented as RTL. Doing so lets us schedule insns between
3247 it and the rest of the code and also allows delayed branch
3248 scheduling to operate in the epilogue. */
3249 thread_prologue_and_epilogue_insns (insns);
3253 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP);
3254 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3256 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3257 even for machines with possibly nonzero RETURN_POPS_ARGS
3258 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3259 push instructions will have popping returns. */
3260 #ifndef PUSH_ROUNDING
3261 if (!ACCUMULATE_OUTGOING_ARGS)
3263 combine_stack_adjustments ();
3268 flow2_completed = 1;
3270 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3271 timevar_pop (TV_FLOW2);
3273 #ifdef HAVE_peephole2
3274 if (optimize > 0 && flag_peephole2)
3276 timevar_push (TV_PEEPHOLE2);
3277 open_dump_file (DFI_peephole2, decl);
3279 peephole2_optimize (rtl_dump_file);
3281 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3282 timevar_pop (TV_PEEPHOLE2);
3286 if (flag_rename_registers || flag_cprop_registers)
3288 timevar_push (TV_RENAME_REGISTERS);
3289 open_dump_file (DFI_rnreg, decl);
3291 if (flag_rename_registers)
3292 regrename_optimize ();
3293 if (flag_cprop_registers)
3294 copyprop_hardreg_forward ();
3296 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3297 timevar_pop (TV_RENAME_REGISTERS);
3302 timevar_push (TV_IFCVT2);
3303 open_dump_file (DFI_ce2, decl);
3307 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3308 timevar_pop (TV_IFCVT2);
3312 split_all_insns (1);
3315 #ifdef INSN_SCHEDULING
3316 if (optimize > 0 && flag_schedule_insns_after_reload)
3318 timevar_push (TV_SCHED2);
3319 open_dump_file (DFI_sched2, decl);
3321 /* Do control and data sched analysis again,
3322 and write some more of the results to dump file. */
3324 split_all_insns (1);
3326 schedule_insns (rtl_dump_file);
3328 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3329 timevar_pop (TV_SCHED2);
3335 #ifdef LEAF_REGISTERS
3336 current_function_uses_only_leaf_regs
3337 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3341 timevar_push (TV_REG_STACK);
3342 open_dump_file (DFI_stack, decl);
3344 reg_to_stack (insns, rtl_dump_file);
3346 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3347 timevar_pop (TV_REG_STACK);
3353 timevar_push (TV_REORDER_BLOCKS);
3354 open_dump_file (DFI_bbro, decl);
3356 /* Last attempt to optimize CFG, as life analyzis possibly removed
3357 some instructions. */
3358 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3359 | CLEANUP_CROSSJUMP);
3360 if (flag_reorder_blocks)
3362 reorder_basic_blocks ();
3363 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3366 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3367 timevar_pop (TV_REORDER_BLOCKS);
3369 compute_alignments ();
3371 /* CFG is no longer maintained up-to-date. */
3372 free_bb_for_insn ();
3374 /* If a machine dependent reorganization is needed, call it. */
3375 #ifdef MACHINE_DEPENDENT_REORG
3376 timevar_push (TV_MACH_DEP);
3377 open_dump_file (DFI_mach, decl);
3379 MACHINE_DEPENDENT_REORG (insns);
3381 close_dump_file (DFI_mach, print_rtl, insns);
3382 timevar_pop (TV_MACH_DEP);
3387 purge_line_number_notes (insns);
3388 cleanup_barriers ();
3390 /* If a scheduling pass for delayed branches is to be done,
3391 call the scheduling code. */
3394 if (optimize > 0 && flag_delayed_branch)
3396 timevar_push (TV_DBR_SCHED);
3397 open_dump_file (DFI_dbr, decl);
3399 dbr_schedule (insns, rtl_dump_file);
3401 close_dump_file (DFI_dbr, print_rtl, insns);
3402 timevar_pop (TV_DBR_SCHED);
3408 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3409 timevar_push (TV_SHORTEN_BRANCH);
3410 split_all_insns_noflow ();
3411 timevar_pop (TV_SHORTEN_BRANCH);
3414 convert_to_eh_region_ranges ();
3416 /* Shorten branches. */
3417 timevar_push (TV_SHORTEN_BRANCH);
3418 shorten_branches (get_insns ());
3419 timevar_pop (TV_SHORTEN_BRANCH);
3421 current_function_nothrow = nothrow_function_p ();
3422 if (current_function_nothrow)
3423 /* Now we know that this can't throw; set the flag for the benefit
3424 of other functions later in this translation unit. */
3425 TREE_NOTHROW (current_function_decl) = 1;
3427 /* Now turn the rtl into assembler code. */
3429 timevar_push (TV_FINAL);
3434 /* Get the function's name, as described by its RTL. This may be
3435 different from the DECL_NAME name used in the source file. */
3437 x = DECL_RTL (decl);
3438 if (GET_CODE (x) != MEM)
3441 if (GET_CODE (x) != SYMBOL_REF)
3443 fnname = XSTR (x, 0);
3445 assemble_start_function (decl, fnname);
3446 final_start_function (insns, asm_out_file, optimize);
3447 final (insns, asm_out_file, optimize, 0);
3448 final_end_function ();
3450 #ifdef IA64_UNWIND_INFO
3451 /* ??? The IA-64 ".handlerdata" directive must be issued before
3452 the ".endp" directive that closes the procedure descriptor. */
3453 output_function_exception_table ();
3456 assemble_end_function (decl, fnname);
3458 #ifndef IA64_UNWIND_INFO
3459 /* Otherwise, it feels unclean to switch sections in the middle. */
3460 output_function_exception_table ();
3464 fflush (asm_out_file);
3466 /* Release all memory allocated by flow. */
3467 free_basic_block_vars (0);
3469 /* Release all memory held by regsets now. */
3470 regset_release_memory ();
3472 timevar_pop (TV_FINAL);
3476 /* Write DBX symbols if requested. */
3478 /* Note that for those inline functions where we don't initially
3479 know for certain that we will be generating an out-of-line copy,
3480 the first invocation of this routine (rest_of_compilation) will
3481 skip over this code by doing a `goto exit_rest_of_compilation;'.
3482 Later on, finish_compilation will call rest_of_compilation again
3483 for those inline functions that need to have out-of-line copies
3484 generated. During that call, we *will* be routed past here. */
3486 timevar_push (TV_SYMOUT);
3487 (*debug_hooks->function_decl) (decl);
3488 timevar_pop (TV_SYMOUT);
3490 exit_rest_of_compilation:
3492 /* In case the function was not output,
3493 don't leave any temporary anonymous types
3494 queued up for sdb output. */
3495 #ifdef SDB_DEBUGGING_INFO
3496 if (write_symbols == SDB_DEBUG)
3497 sdbout_types (NULL_TREE);
3500 reload_completed = 0;
3501 flow2_completed = 0;
3504 timevar_push (TV_FINAL);
3506 /* Clear out the insn_length contents now that they are no
3508 init_insn_lengths ();
3510 /* Clear out the real_constant_chain before some of the rtx's
3511 it runs through become garbage. */
3512 clear_const_double_mem ();
3514 /* Show no temporary slots allocated. */
3517 free_basic_block_vars (0);
3518 free_bb_for_insn ();
3520 timevar_pop (TV_FINAL);
3522 /* Make sure volatile mem refs aren't considered valid operands for
3523 arithmetic insns. We must call this here if this is a nested inline
3524 function, since the above code leaves us in the init_recog state
3525 (from final.c), and the function context push/pop code does not
3526 save/restore volatile_ok.
3528 ??? Maybe it isn't necessary for expand_start_function to call this
3529 anymore if we do it here? */
3531 init_recog_no_volatile ();
3533 /* We're done with this function. Free up memory if we can. */
3534 free_after_parsing (cfun);
3535 if (! DECL_DEFER_OUTPUT (decl))
3537 free_after_compilation (cfun);
3539 /* Clear integrate.c's pointer to the cfun structure we just
3541 DECL_SAVED_INSNS (decl) = 0;
3547 timevar_pop (TV_REST_OF_COMPILATION);
3557 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3558 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3559 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3560 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3561 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3562 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"));
3564 for (i = ARRAY_SIZE (f_options); i--;)
3566 const char *description = f_options[i].description;
3568 if (description != NULL && * description != 0)
3569 printf (" -f%-21s %s\n",
3570 f_options[i].string, _(description));
3573 printf (_(" -O[number] Set optimisation level to [number]\n"));
3574 printf (_(" -Os Optimise for space rather than speed\n"));
3575 for (i = LAST_PARAM; i--;)
3577 const char *description = compiler_params[i].help;
3578 const int length = 21-strlen(compiler_params[i].option);
3580 if (description != NULL && * description != 0)
3581 printf (" --param %s=<value>%.*s%s\n",
3582 compiler_params[i].option,
3583 length > 0 ? length : 1, " ",
3586 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3587 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3588 printf (_(" -w Suppress warnings\n"));
3589 printf (_(" -W Enable extra warnings\n"));
3591 for (i = ARRAY_SIZE (W_options); i--;)
3593 const char *description = W_options[i].description;
3595 if (description != NULL && * description != 0)
3596 printf (" -W%-21s %s\n",
3597 W_options[i].string, _(description));
3600 printf (_(" -Wunused Enable unused warnings\n"));
3601 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3602 printf (_(" -p Enable function profiling\n"));
3603 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3604 printf (_(" -a Enable block profiling \n"));
3606 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3607 printf (_(" -ax Enable jump profiling \n"));
3609 printf (_(" -o <file> Place output into <file> \n"));
3611 -G <number> Put global and static data smaller than <number>\n\
3612 bytes into a special section (on some targets)\n"));
3614 for (i = ARRAY_SIZE (debug_args); i--;)
3616 if (debug_args[i].description != NULL)
3617 printf (" -g%-21s %s\n",
3618 debug_args[i].arg, _(debug_args[i].description));
3621 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3622 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3623 printf (_(" -version Display the compiler's version\n"));
3624 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3625 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3626 #if defined INSN_SCHEDULING
3627 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3629 printf (_(" --help Display this information\n"));
3634 /* Display descriptions of language specific options.
3635 If there is no description, note that there is an undocumented option.
3636 If the description is empty, do not display anything. (This allows
3637 options to be deliberately undocumented, for whatever reason).
3638 If the option string is missing, then this is a marker, indicating
3639 that the description string is in fact the name of a language, whose
3640 language specific options are to follow. */
3642 if (ARRAY_SIZE (documented_lang_options) > 1)
3644 printf (_("\nLanguage specific options:\n"));
3646 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3648 const char *description = documented_lang_options[i].description;
3649 const char *option = documented_lang_options[i].option;
3651 if (description == NULL)
3656 printf (_(" %-23.23s [undocumented]\n"), option);
3658 else if (*description == 0)
3660 else if (option == NULL)
3664 (_("\nThere are undocumented %s specific options as well.\n"),
3668 printf (_("\n Options for %s:\n"), description);
3673 printf (" %-23.23s %s\n", option, _(description));
3678 printf (_("\nThere are undocumented %s specific options as well.\n"),
3681 display_target_options ();
3685 display_target_options ()
3688 static bool displayed = false;
3690 /* Avoid double printing for --help --target-help. */
3695 if (ARRAY_SIZE (target_switches) > 1
3696 #ifdef TARGET_OPTIONS
3697 || ARRAY_SIZE (target_options) > 1
3705 printf (_("\nTarget specific options:\n"));
3707 for (i = ARRAY_SIZE (target_switches); i--;)
3709 const char *option = target_switches[i].name;
3710 const char *description = target_switches[i].description;
3712 if (option == NULL || *option == 0)
3714 else if (description == NULL)
3719 printf (_(" -m%-23.23s [undocumented]\n"), option);
3721 else if (* description != 0)
3722 doc += printf (" -m%-23.23s %s\n", option, _(description));
3725 #ifdef TARGET_OPTIONS
3726 for (i = ARRAY_SIZE (target_options); i--;)
3728 const char *option = target_options[i].prefix;
3729 const char *description = target_options[i].description;
3731 if (option == NULL || *option == 0)
3733 else if (description == NULL)
3738 printf (_(" -m%-23.23s [undocumented]\n"), option);
3740 else if (* description != 0)
3741 doc += printf (" -m%-23.23s %s\n", option, _(description));
3747 printf (_("\nThere are undocumented target specific options as well.\n"));
3749 printf (_(" They exist, but they are not documented.\n"));
3754 /* Parse a -d... command line switch. */
3757 decode_d_option (arg)
3766 for (i = 0; i < (int) DFI_MAX; ++i)
3767 dump_file[i].enabled = 1;
3773 flag_print_asm_name = 1;
3776 flag_dump_rtl_in_asm = 1;
3777 flag_print_asm_name = 1;
3780 graph_dump_format = vcg;
3783 rtl_dump_and_exit = 1;
3786 (*lang_hooks.set_yydebug) (1);
3788 case 'D': /* These are handled by the preprocessor. */
3794 for (i = 0; i < (int) DFI_MAX; ++i)
3795 if (c == dump_file[i].debug_switch)
3797 dump_file[i].enabled = 1;
3802 warning ("unrecognized gcc debugging option: %c", c);
3807 /* Parse a -f... command line switch. ARG is the value after the -f.
3808 It is safe to access 'ARG - 2' to generate the full switch name.
3809 Return the number of strings consumed. */
3812 decode_f_option (arg)
3816 const char *option_value = NULL;
3818 /* Search for the option in the table of binary f options. */
3819 for (j = ARRAY_SIZE (f_options); j--;)
3821 if (!strcmp (arg, f_options[j].string))
3823 *f_options[j].variable = f_options[j].on_value;
3827 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3828 && ! strcmp (arg + 3, f_options[j].string))
3830 *f_options[j].variable = ! f_options[j].on_value;
3835 if (!strcmp (arg, "fast-math"))
3836 set_fast_math_flags();
3837 else if (!strcmp (arg, "no-fast-math"))
3838 set_no_fast_math_flags();
3839 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3840 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3843 read_integral_parameter (option_value, arg - 2,
3845 set_param_value ("max-inline-insns", val);
3847 #ifdef INSN_SCHEDULING
3848 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3849 fix_sched_param ("verbose", option_value);
3851 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3852 fix_register (option_value, 1, 1);
3853 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3854 fix_register (option_value, 0, 1);
3855 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3856 fix_register (option_value, 0, 0);
3857 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3858 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3859 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3861 = read_integral_parameter (option_value, arg - 2, align_functions);
3862 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3863 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3864 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3866 = read_integral_parameter (option_value, arg - 2, align_labels);
3867 else if ((option_value
3868 = skip_leading_substring (arg, "stack-limit-register=")))
3870 int reg = decode_reg_name (option_value);
3872 error ("unrecognized register name `%s'", option_value);
3874 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3876 else if ((option_value
3877 = skip_leading_substring (arg, "stack-limit-symbol=")))
3880 nm = ggc_strdup (option_value);
3881 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3883 else if ((option_value
3884 = skip_leading_substring (arg, "message-length=")))
3885 output_set_maximum_length
3886 (&global_dc->buffer, read_integral_parameter
3887 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3888 else if ((option_value
3889 = skip_leading_substring (arg, "diagnostics-show-location=")))
3891 if (!strcmp (option_value, "once"))
3892 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3893 else if (!strcmp (option_value, "every-line"))
3894 diagnostic_prefixing_rule (global_dc)
3895 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3897 error ("unrecognized option `%s'", arg - 2);
3899 else if (!strcmp (arg, "no-stack-limit"))
3900 stack_limit_rtx = NULL_RTX;
3901 else if (!strcmp (arg, "preprocessed"))
3902 /* Recognise this switch but do nothing. This prevents warnings
3903 about an unrecognized switch if cpplib has not been linked in. */
3911 /* Parse a -W... command line switch. ARG is the value after the -W.
3912 It is safe to access 'ARG - 2' to generate the full switch name.
3913 Return the number of strings consumed. */
3916 decode_W_option (arg)
3919 const char *option_value = NULL;
3922 /* Search for the option in the table of binary W options. */
3924 for (j = ARRAY_SIZE (W_options); j--;)
3926 if (!strcmp (arg, W_options[j].string))
3928 *W_options[j].variable = W_options[j].on_value;
3932 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3933 && ! strcmp (arg + 3, W_options[j].string))
3935 *W_options[j].variable = ! W_options[j].on_value;
3940 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3941 warning ("-Wid-clash-LEN is no longer supported");
3942 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3944 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3946 warn_larger_than = larger_than_size != -1;
3948 else if (!strcmp (arg, "unused"))
3952 else if (!strcmp (arg, "no-unused"))
3962 /* Parse a -g... command line switch. ARG is the value after the -g.
3963 It is safe to access 'ARG - 2' to generate the full switch name.
3964 Return the number of strings consumed. */
3967 decode_g_option (arg)
3970 static unsigned level=0;
3971 /* A lot of code assumes write_symbols == NO_DEBUG if the
3972 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3973 of what debugging type has been selected). This records the
3974 selected type. It is an error to specify more than one
3976 static enum debug_info_type selected_debug_type = NO_DEBUG;
3977 /* Non-zero if debugging format has been explicitly set.
3978 -g and -ggdb don't explicitly set the debugging format so
3979 -gdwarf -g3 is equivalent to -gdwarf3. */
3980 static int type_explicitly_set_p = 0;
3981 /* Indexed by enum debug_info_type. */
3982 static const char *const debug_type_names[] =
3984 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3987 /* The maximum admissible debug level value. */
3988 static const unsigned max_debug_level = 3;
3990 /* Look up ARG in the table. */
3991 for (da = debug_args; da->arg; da++)
3993 const int da_len = strlen (da->arg);
3995 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3997 enum debug_info_type type = da->debug_type;
3998 const char *p = arg + da_len;
4000 if (*p && ! ISDIGIT (*p))
4003 /* A debug flag without a level defaults to level 2.
4004 Note we do not want to call read_integral_parameter
4005 for that case since it will call atoi which
4008 ??? We may want to generalize the interface to
4009 read_integral_parameter to better handle this case
4010 if this case shows up often. */
4012 level = read_integral_parameter (p, 0, max_debug_level + 1);
4014 level = (level == 0) ? 2 : level;
4016 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4018 error ("use -gdwarf -g%d for DWARF v1, level %d",
4021 error ("use -gdwarf-2 for DWARF v2");
4024 if (level > max_debug_level)
4027 ignoring option `%s' due to invalid debug level specification",
4029 level = debug_info_level;
4032 if (type == NO_DEBUG)
4034 type = PREFERRED_DEBUGGING_TYPE;
4036 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4038 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4039 type = DWARF2_DEBUG;
4041 #ifdef DBX_DEBUGGING_INFO
4048 if (type == NO_DEBUG)
4049 warning ("`%s': unknown or unsupported -g option", arg - 2);
4051 /* Does it conflict with an already selected type? */
4052 if (type_explicitly_set_p
4053 /* -g/-ggdb don't conflict with anything. */
4054 && da->debug_type != NO_DEBUG
4055 && type != selected_debug_type)
4056 warning ("`%s' ignored, conflicts with `-g%s'",
4057 arg - 2, debug_type_names[(int) selected_debug_type]);
4060 /* If the format has already been set, -g/-ggdb
4061 only change the debug level. */
4062 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4063 /* Don't change debugging type. */
4067 selected_debug_type = type;
4068 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4071 write_symbols = (level == 0
4073 : selected_debug_type);
4074 use_gnu_debug_info_extensions = da->use_extensions_p;
4075 debug_info_level = (enum debug_info_level) level;
4088 /* Decode the first argument in the argv as a language-independent option.
4089 Return the number of strings consumed. */
4092 independent_decode_option (argc, argv)
4096 char *arg = argv[0];
4098 if (arg[0] != '-' || arg[1] == 0)
4110 if (!strcmp (arg, "-help"))
4113 exit_after_options = 1;
4116 if (!strcmp (arg, "-target-help"))
4118 display_target_options ();
4119 exit_after_options = 1;
4122 if (!strcmp (arg, "-version"))
4124 print_version (stderr, "");
4125 exit_after_options = 1;
4128 /* Handle '--param <name>=<value>'. */
4129 if (strcmp (arg, "-param") == 0)
4135 error ("-param option missing argument");
4139 /* Get the '<name>=<value>' parameter. */
4141 /* Look for the `='. */
4142 equal = strchr (arg, '=');
4144 error ("invalid --param option: %s", arg);
4149 /* Zero out the `=' sign so that we get two separate strings. */
4151 /* Figure out what value is specified. */
4152 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4153 if (val != INVALID_PARAM_VAL)
4154 set_param_value (arg, val);
4156 error ("invalid parameter value `%s'", equal + 1);
4171 /* Already been treated in main (). Do nothing. */
4175 set_target_switch (arg + 1);
4179 return decode_f_option (arg + 1);
4182 return decode_g_option (arg + 1);
4185 if (!strcmp (arg, "dumpbase"))
4190 dump_base_name = argv[1];
4194 decode_d_option (arg + 1);
4198 if (!strcmp (arg, "pedantic"))
4200 else if (!strcmp (arg, "pedantic-errors"))
4201 flag_pedantic_errors = pedantic = 1;
4202 else if (arg[1] == 0)
4209 if (!strcmp (arg, "quiet"))
4216 if (!strcmp (arg, "version"))
4224 inhibit_warnings = 1;
4233 /* We save the value of warn_uninitialized, since if they put
4234 -Wuninitialized on the command line, we need to generate a
4235 warning about not using it without also specifying -O. */
4236 if (warn_uninitialized != 1)
4237 warn_uninitialized = 2;
4240 return decode_W_option (arg + 1);
4249 asm_file_name = argv[1];
4264 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4269 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4273 if (g_switch_val == -1)
4277 g_switch_set = TRUE;
4278 g_switch_value = g_switch_val;
4288 /* Decode -m switches. */
4289 /* Decode the switch -mNAME. */
4292 set_target_switch (name)
4296 int valid_target_option = 0;
4298 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4299 if (!strcmp (target_switches[j].name, name))
4301 if (target_switches[j].value < 0)
4302 target_flags &= ~-target_switches[j].value;
4304 target_flags |= target_switches[j].value;
4305 valid_target_option = 1;
4308 #ifdef TARGET_OPTIONS
4309 if (!valid_target_option)
4310 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4312 int len = strlen (target_options[j].prefix);
4313 if (!strncmp (target_options[j].prefix, name, len))
4315 *target_options[j].variable = name + len;
4316 valid_target_option = 1;
4321 if (!valid_target_option)
4322 error ("invalid option `%s'", name);
4325 /* Print version information to FILE.
4326 Each line begins with INDENT (for the case where FILE is the
4327 assembler output file). */
4330 print_version (file, indent)
4335 #define __VERSION__ "[?]"
4339 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4341 "%s%s%s version %s (%s) compiled by CC.\n"
4343 , indent, *indent != 0 ? " " : "",
4344 lang_hooks.name, version_string, TARGET_NAME,
4345 indent, __VERSION__);
4348 /* Print an option value and return the adjusted position in the line.
4349 ??? We don't handle error returns from fprintf (disk full); presumably
4350 other code will catch a disk full though. */
4353 print_single_switch (file, pos, max, indent, sep, term, type, name)
4356 const char *indent, *sep, *term, *type, *name;
4358 /* The ultrix fprintf returns 0 on success, so compute the result we want
4359 here since we need it for the following test. */
4360 int len = strlen (sep) + strlen (type) + strlen (name);
4365 fprintf (file, "%s", term);
4370 fprintf (file, "%s", indent);
4371 pos = strlen (indent);
4373 fprintf (file, "%s%s%s", sep, type, name);
4378 /* Print active target switches to FILE.
4379 POS is the current cursor position and MAX is the size of a "line".
4380 Each line begins with INDENT and ends with TERM.
4381 Each switch is separated from the next by SEP. */
4384 print_switch_values (file, pos, max, indent, sep, term)
4387 const char *indent, *sep, *term;
4392 /* Print the options as passed. */
4394 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4395 _("options passed: "), "");
4397 for (p = &save_argv[1]; *p != NULL; p++)
4401 if (strcmp (*p, "-o") == 0)
4407 if (strcmp (*p, "-quiet") == 0)
4409 if (strcmp (*p, "-version") == 0)
4414 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4417 fprintf (file, "%s", term);
4419 /* Print the -f and -m options that have been enabled.
4420 We don't handle language specific options but printing argv
4423 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4424 _("options enabled: "), "");
4426 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4427 if (*f_options[j].variable == f_options[j].on_value)
4428 pos = print_single_switch (file, pos, max, indent, sep, term,
4429 "-f", f_options[j].string);
4431 /* Print target specific options. */
4433 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4434 if (target_switches[j].name[0] != '\0'
4435 && target_switches[j].value > 0
4436 && ((target_switches[j].value & target_flags)
4437 == target_switches[j].value))
4439 pos = print_single_switch (file, pos, max, indent, sep, term,
4440 "-m", target_switches[j].name);
4443 #ifdef TARGET_OPTIONS
4444 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4445 if (*target_options[j].variable != NULL)
4448 sprintf (prefix, "-m%s", target_options[j].prefix);
4449 pos = print_single_switch (file, pos, max, indent, sep, term,
4450 prefix, *target_options[j].variable);
4454 fprintf (file, "%s", term);
4457 /* Open assembly code output file. Do this even if -fsyntax-only is
4458 on, because then the driver will have provided the name of a
4459 temporary file or bit bucket for us. NAME is the file specified on
4460 the command line, possibly NULL. */
4462 init_asm_output (name)
4465 if (name == NULL && asm_file_name == 0)
4466 asm_out_file = stdout;
4469 if (asm_file_name == 0)
4471 int len = strlen (dump_base_name);
4472 char *dumpname = (char *) xmalloc (len + 6);
4473 memcpy (dumpname, dump_base_name, len + 1);
4474 strip_off_ending (dumpname, len);
4475 strcat (dumpname, ".s");
4476 asm_file_name = dumpname;
4478 if (!strcmp (asm_file_name, "-"))
4479 asm_out_file = stdout;
4481 asm_out_file = fopen (asm_file_name, "w");
4482 if (asm_out_file == 0)
4483 fatal_io_error ("can't open %s for writing", asm_file_name);
4486 #ifdef IO_BUFFER_SIZE
4487 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4488 _IOFBF, IO_BUFFER_SIZE);
4491 if (!flag_syntax_only)
4493 #ifdef ASM_FILE_START
4494 ASM_FILE_START (asm_out_file);
4497 #ifdef ASM_COMMENT_START
4498 if (flag_verbose_asm)
4500 /* Print the list of options in effect. */
4501 print_version (asm_out_file, ASM_COMMENT_START);
4502 print_switch_values (asm_out_file, 0, MAX_LINE,
4503 ASM_COMMENT_START, " ", "\n");
4504 /* Add a blank line here so it appears in assembler output but not
4506 fprintf (asm_out_file, "\n");
4512 /* Initialization of the front end environment, before command line
4513 options are parsed. Signal handlers, internationalization etc.
4514 ARGV0 is main's argv[0]. */
4516 general_init (argv0)
4521 p = argv0 + strlen (argv0);
4522 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4526 xmalloc_set_program_name (progname);
4528 gcc_init_libintl ();
4530 /* Install handler for SIGFPE, which may be received while we do
4531 compile-time floating point arithmetic. */
4532 signal (SIGFPE, float_signal);
4534 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4536 signal (SIGSEGV, crash_signal);
4539 signal (SIGILL, crash_signal);
4542 signal (SIGBUS, crash_signal);
4545 signal (SIGABRT, crash_signal);
4547 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4548 signal (SIGIOT, crash_signal);
4551 /* Initialize the diagnostics reporting machinery, so option parsing
4552 can give warnings and errors. */
4553 diagnostic_initialize (global_dc);
4556 /* Parse command line options and set default flag values, called
4557 after language-independent option-independent initialization. Do
4558 minimal options processing. Outputting diagnostics is OK, but GC
4559 and identifier hashtables etc. are not initialized yet. */
4561 parse_options_and_default_flags (argc, argv)
4567 /* Save in case md file wants to emit args as a comment. */
4571 /* Initialize register usage now so switches may override. */
4574 /* Register the language-independent parameters. */
4575 add_params (lang_independent_params, LAST_PARAM);
4577 /* Perform language-specific options initialization. */
4578 (*lang_hooks.init_options) ();
4580 /* Scan to see what optimization level has been specified. That will
4581 determine the default value of many flags. */
4582 for (i = 1; i < argc; i++)
4584 if (!strcmp (argv[i], "-O"))
4589 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4591 /* Handle -Os, -O2, -O3, -O69, ... */
4592 char *p = &argv[i][2];
4594 if ((p[0] == 's') && (p[1] == 0))
4598 /* Optimizing for size forces optimize to be 2. */
4603 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4604 if (optimize_val != -1)
4606 optimize = optimize_val;
4615 flag_merge_constants = 0;
4621 flag_thread_jumps = 1;
4623 flag_delayed_branch = 1;
4625 #ifdef CAN_DEBUG_WITHOUT_FP
4626 flag_omit_frame_pointer = 1;
4628 flag_guess_branch_prob = 1;
4629 flag_cprop_registers = 1;
4634 flag_optimize_sibling_calls = 1;
4635 flag_cse_follow_jumps = 1;
4636 flag_cse_skip_blocks = 1;
4638 flag_expensive_optimizations = 1;
4639 flag_strength_reduce = 1;
4640 flag_rerun_cse_after_loop = 1;
4641 flag_rerun_loop_opt = 1;
4642 flag_caller_saves = 1;
4645 #ifdef INSN_SCHEDULING
4646 flag_schedule_insns = 1;
4647 flag_schedule_insns_after_reload = 1;
4650 flag_strict_aliasing = 1;
4651 flag_delete_null_pointer_checks = 1;
4652 flag_reorder_blocks = 1;
4657 flag_inline_functions = 1;
4658 flag_rename_registers = 1;
4661 if (optimize < 2 || optimize_size)
4666 align_functions = 1;
4669 /* Initialize whether `char' is signed. */
4670 flag_signed_char = DEFAULT_SIGNED_CHAR;
4671 #ifdef DEFAULT_SHORT_ENUMS
4672 /* Initialize how much space enums occupy, by default. */
4673 flag_short_enums = DEFAULT_SHORT_ENUMS;
4676 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4679 set_target_switch ("");
4681 /* Unwind tables are always present in an ABI-conformant IA-64
4682 object file, so the default should be ON. */
4683 #ifdef IA64_UNWIND_INFO
4684 flag_unwind_tables = IA64_UNWIND_INFO;
4687 #ifdef OPTIMIZATION_OPTIONS
4688 /* Allow default optimizations to be specified on a per-machine basis. */
4689 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4692 /* Perform normal command line switch decoding. */
4693 for (i = 1; i < argc;)
4696 int indep_processed;
4698 /* Give the language a chance to decode the option for itself. */
4699 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4701 if (lang_processed >= 0)
4702 /* Now see if the option also has a language independent meaning.
4703 Some options are both language specific and language independent,
4705 indep_processed = independent_decode_option (argc - i, argv + i);
4708 lang_processed = -lang_processed;
4709 indep_processed = 0;
4712 if (lang_processed || indep_processed)
4713 i += MAX (lang_processed, indep_processed);
4716 const char *option = NULL;
4717 const char *lang = NULL;
4720 /* It is possible that the command line switch is not valid for the
4721 current language, but it is valid for another language. In order
4722 to be compatible with previous versions of the compiler (which
4723 did not issue an error message in this case) we check for this
4724 possibility here. If we do find a match, then if extra_warnings
4725 is set we generate a warning message, otherwise we will just
4726 ignore the option. */
4727 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4729 option = documented_lang_options[j].option;
4732 lang = documented_lang_options[j].description;
4733 else if (! strncmp (argv[i], option, strlen (option)))
4737 if (j != ARRAY_SIZE (documented_lang_options))
4741 warning ("ignoring command line option '%s'", argv[i]);
4744 ("(it is valid for %s but not the selected language)",
4748 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4749 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4751 error ("unrecognized option `%s'", argv[i]);
4757 /* All command line options have been parsed; allow the front end to
4758 perform consistency checks, etc. */
4759 (*lang_hooks.post_options) ();
4762 /* Process the options that have been parsed. */
4768 /* Inlining does not work if not optimizing,
4769 so force it not to be done. */
4773 /* The c_decode_option function and decode_option hook set
4774 this to `2' if -Wall is used, so we can avoid giving out
4775 lots of errors for people who don't realize what -Wall does. */
4776 if (warn_uninitialized == 1)
4777 warning ("-Wuninitialized is not supported without -O");
4780 #ifdef OVERRIDE_OPTIONS
4781 /* Some machines may reject certain combinations of options. */
4785 /* Set up the align_*_log variables, defaulting them to 1 if they
4786 were still unset. */
4787 if (align_loops <= 0) align_loops = 1;
4788 if (align_loops_max_skip > align_loops || !align_loops)
4789 align_loops_max_skip = align_loops - 1;
4790 align_loops_log = floor_log2 (align_loops * 2 - 1);
4791 if (align_jumps <= 0) align_jumps = 1;
4792 if (align_jumps_max_skip > align_jumps || !align_jumps)
4793 align_jumps_max_skip = align_jumps - 1;
4794 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4795 if (align_labels <= 0) align_labels = 1;
4796 align_labels_log = floor_log2 (align_labels * 2 - 1);
4797 if (align_labels_max_skip > align_labels || !align_labels)
4798 align_labels_max_skip = align_labels - 1;
4799 if (align_functions <= 0) align_functions = 1;
4800 align_functions_log = floor_log2 (align_functions * 2 - 1);
4802 /* Unrolling all loops implies that standard loop unrolling must also
4804 if (flag_unroll_all_loops)
4805 flag_unroll_loops = 1;
4806 /* Loop unrolling requires that strength_reduction be on also. Silently
4807 turn on strength reduction here if it isn't already on. Also, the loop
4808 unrolling code assumes that cse will be run after loop, so that must
4809 be turned on also. */
4810 if (flag_unroll_loops)
4812 flag_strength_reduce = 1;
4813 flag_rerun_cse_after_loop = 1;
4816 if (flag_non_call_exceptions)
4817 flag_asynchronous_unwind_tables = 1;
4818 if (flag_asynchronous_unwind_tables)
4819 flag_unwind_tables = 1;
4821 /* Warn about options that are not supported on this machine. */
4822 #ifndef INSN_SCHEDULING
4823 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4824 warning ("instruction scheduling not supported on this target machine");
4827 if (flag_delayed_branch)
4828 warning ("this target machine does not have delayed branches");
4831 /* Some operating systems do not allow profiling without a frame
4833 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4835 && flag_omit_frame_pointer)
4837 error ("profiling does not work without a frame pointer");
4838 flag_omit_frame_pointer = 0;
4841 user_label_prefix = USER_LABEL_PREFIX;
4842 if (flag_leading_underscore != -1)
4844 /* If the default prefix is more complicated than "" or "_",
4845 issue a warning and ignore this option. */
4846 if (user_label_prefix[0] == 0 ||
4847 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4849 user_label_prefix = flag_leading_underscore ? "_" : "";
4852 warning ("-f%sleading-underscore not supported on this target machine",
4853 flag_leading_underscore ? "" : "no-");
4856 /* If we are in verbose mode, write out the version and maybe all the
4857 option flags in use. */
4860 print_version (stderr, "");
4862 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4868 if (flag_syntax_only)
4870 write_symbols = NO_DEBUG;
4874 /* Now we know write_symbols, set up the debug hooks based on it.
4875 By default we do nothing for debug output. */
4876 #if defined(DBX_DEBUGGING_INFO)
4877 if (write_symbols == DBX_DEBUG)
4878 debug_hooks = &dbx_debug_hooks;
4880 #if defined(XCOFF_DEBUGGING_INFO)
4881 if (write_symbols == XCOFF_DEBUG)
4882 debug_hooks = &xcoff_debug_hooks;
4884 #ifdef SDB_DEBUGGING_INFO
4885 if (write_symbols == SDB_DEBUG)
4886 debug_hooks = &sdb_debug_hooks;
4888 #ifdef DWARF_DEBUGGING_INFO
4889 if (write_symbols == DWARF_DEBUG)
4890 debug_hooks = &dwarf_debug_hooks;
4892 #ifdef DWARF2_DEBUGGING_INFO
4893 if (write_symbols == DWARF2_DEBUG)
4894 debug_hooks = &dwarf2_debug_hooks;
4896 #ifdef VMS_DEBUGGING_INFO
4897 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4898 debug_hooks = &vmsdbg_debug_hooks;
4901 /* If auxiliary info generation is desired, open the output file.
4902 This goes in the same directory as the source file--unlike
4903 all the other output files. */
4904 if (flag_gen_aux_info)
4906 aux_info_file = fopen (aux_info_file_name, "w");
4907 if (aux_info_file == 0)
4908 fatal_io_error ("can't open %s", aux_info_file_name);
4911 if (! targetm.have_named_sections)
4913 if (flag_function_sections)
4915 warning ("-ffunction-sections not supported for this target");
4916 flag_function_sections = 0;
4918 if (flag_data_sections)
4920 warning ("-fdata-sections not supported for this target");
4921 flag_data_sections = 0;
4925 if (flag_function_sections && profile_flag)
4927 warning ("-ffunction-sections disabled; it makes profiling impossible");
4928 flag_function_sections = 0;
4931 #ifndef OBJECT_FORMAT_ELF
4932 if (flag_function_sections && write_symbols != NO_DEBUG)
4933 warning ("-ffunction-sections may affect debugging on some targets");
4937 /* Language-independent initialization, before language-dependent
4940 lang_independent_init ()
4942 decl_printable_name = decl_name;
4943 lang_expand_expr = (lang_expand_expr_t) do_abort;
4945 /* Set the language-dependent identifier size. */
4946 tree_code_length[(int) IDENTIFIER_NODE]
4947 = ((lang_hooks.identifier_size - sizeof (struct tree_common))
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)
5130 /* Initialization of GCC's environment, and diagnostics. */
5131 general_init (argv [0]);
5133 /* Parse the options and do minimal processing; basically just
5134 enough to default flags appropriately. */
5135 parse_options_and_default_flags (argc, argv);
5137 /* Exit early if we can (e.g. -help). */
5138 if (!exit_after_options)
5141 if (errorcount || sorrycount)
5142 return (FATAL_EXIT_CODE);
5144 return (SUCCESS_EXIT_CODE);