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 "insn-flags.h"
50 #include "hard-reg-set.h"
57 #include "basic-block.h"
64 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
72 #include "langhooks.h"
74 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
75 #include "dwarf2out.h"
78 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
82 #ifdef SDB_DEBUGGING_INFO
86 #ifdef XCOFF_DEBUGGING_INFO
87 #include "xcoffout.h" /* Needed for external data
88 declarations for e.g. AIX 4.x. */
96 /* The extra parameters substantially improve the I/O performance. */
99 vms_fopen (fname, type)
103 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
104 fixed arguments, which matches ANSI's specification but not VAXCRTL's
105 pre-ANSI implementation. This hack circumvents the mismatch problem. */
106 FILE *(*vmslib_fopen)() = (FILE *(*)()) fopen;
109 return (*vmslib_fopen) (fname, type, "mbc=32",
110 "deq=64", "fop=tef", "shr=nil");
112 return (*vmslib_fopen) (fname, type, "mbc=32");
115 #define fopen vms_fopen
118 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
119 extern char **environ;
122 /* Carry information from ASM_DECLARE_OBJECT_NAME
123 to ASM_FINISH_DECLARE_OBJECT. */
125 extern int size_directive_output;
126 extern tree last_assemble_variable_decl;
128 static void general_init PARAMS ((char *));
129 static void parse_options_and_default_flags PARAMS ((int, char **));
130 static void do_compile PARAMS ((void));
131 static void process_options PARAMS ((void));
132 static void lang_independent_init PARAMS ((void));
133 static int lang_dependent_init PARAMS ((const char *));
134 static void init_asm_output PARAMS ((const char *));
135 static void finalize PARAMS ((void));
137 static void set_target_switch PARAMS ((const char *));
138 static const char *decl_name PARAMS ((tree, int));
140 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
141 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
142 static void set_float_handler PARAMS ((jmp_buf));
143 static void compile_file PARAMS ((void));
144 static void display_help PARAMS ((void));
145 static void display_target_options PARAMS ((void));
147 static void decode_d_option PARAMS ((const char *));
148 static int decode_f_option PARAMS ((const char *));
149 static int decode_W_option PARAMS ((const char *));
150 static int decode_g_option PARAMS ((const char *));
151 static unsigned int independent_decode_option PARAMS ((int, char **));
153 static void print_version PARAMS ((FILE *, const char *));
154 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
155 const char *, const char *,
156 const char *, const char *));
157 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
158 const char *, const char *));
160 /* Length of line when printing switch values. */
163 /* Name of program invoked, sans directories. */
165 const char *progname;
167 /* Copy of arguments to toplev_main. */
171 /* Name of current original source file (what was input to cpp).
172 This comes from each #-command in the actual input. */
174 const char *input_filename;
176 /* Name of top-level original source file (what was input to cpp).
177 This comes from the #-command at the beginning of the actual input.
178 If there isn't any there, then this is the cc1 input file name. */
180 const char *main_input_filename;
182 /* Current line number in real source file. */
186 /* Nonzero if it is unsafe to create any new pseudo registers. */
189 /* Stack of currently pending input files. */
191 struct file_stack *input_file_stack;
193 /* Incremented on each change to input_file_stack. */
194 int input_file_stack_tick;
196 /* Name to use as base of names for dump output files. */
198 const char *dump_base_name;
200 /* Format to use to print dumpfile index value */
201 #ifndef DUMPFILE_FORMAT
202 #define DUMPFILE_FORMAT ".%02d."
205 /* Bit flags that specify the machine subtype we are compiling for.
206 Bits are tested using macros TARGET_... defined in the tm.h file
207 and set by `-m...' switches. Must be defined in rtlanal.c. */
209 extern int target_flags;
211 /* Debug hooks - dependent upon command line options. */
213 struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
215 /* Describes a dump file. */
217 struct dump_file_info
219 /* The unique extension to apply, e.g. ".jump". */
220 const char *const extension;
222 /* The -d<c> character that enables this dump file. */
223 char const debug_switch;
225 /* True if there is a corresponding graph dump file. */
226 char const graph_dump_p;
228 /* True if the user selected this dump. */
231 /* True if the files have been initialized (ie truncated). */
235 /* Enumerate the extant dump files. */
274 /* Describes all the dump files. Should be kept in order of the
275 pass and in sync with dump_file_index above.
277 Remaining -d letters:
283 struct dump_file_info dump_file[DFI_MAX] =
285 { "rtl", 'r', 0, 0, 0 },
286 { "sibling", 'i', 0, 0, 0 },
287 { "eh", 'h', 0, 0, 0 },
288 { "jump", 'j', 0, 0, 0 },
289 { "ssa", 'e', 1, 0, 0 },
290 { "ssaccp", 'W', 1, 0, 0 },
291 { "ssadce", 'X', 1, 0, 0 },
292 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
293 { "cse", 's', 0, 0, 0 },
294 { "addressof", 'F', 0, 0, 0 },
295 { "gcse", 'G', 1, 0, 0 },
296 { "loop", 'L', 1, 0, 0 },
297 { "cse2", 't', 1, 0, 0 },
298 { "cfg", 'f', 1, 0, 0 },
299 { "bp", 'b', 1, 0, 0 },
300 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
301 { "combine", 'c', 1, 0, 0 },
302 { "ce", 'C', 1, 0, 0 },
303 { "regmove", 'N', 1, 0, 0 },
304 { "sched", 'S', 1, 0, 0 },
305 { "lreg", 'l', 1, 0, 0 },
306 { "greg", 'g', 1, 0, 0 },
307 { "postreload", 'o', 1, 0, 0 },
308 { "flow2", 'w', 1, 0, 0 },
309 { "peephole2", 'z', 1, 0, 0 },
310 { "rnreg", 'n', 1, 0, 0 },
311 { "ce2", 'E', 1, 0, 0 },
312 { "sched2", 'R', 1, 0, 0 },
313 { "stack", 'k', 1, 0, 0 },
314 { "bbro", 'B', 1, 0, 0 },
315 { "mach", 'M', 1, 0, 0 },
316 { "dbr", 'd', 0, 0, 0 },
319 static int open_dump_file PARAMS ((enum dump_file_index, tree));
320 static void close_dump_file PARAMS ((enum dump_file_index,
321 void (*) (FILE *, rtx), rtx));
323 /* Other flags saying which kinds of debugging dump have been requested. */
325 int rtl_dump_and_exit;
326 int flag_print_asm_name;
327 static int version_flag;
328 static char *filename;
329 enum graph_dump_types graph_dump_format;
331 /* Name for output file of assembly code, specified with -o. */
335 /* Value of the -G xx switch, and whether it was passed or not. */
339 /* Type(s) of debugging information we are producing (if any).
340 See flags.h for the definitions of the different possible
341 types of debugging information. */
342 enum debug_info_type write_symbols = NO_DEBUG;
344 /* Level of debugging information we are producing. See flags.h
345 for the definitions of the different possible levels. */
346 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
348 /* Nonzero means use GNU-only extensions in the generated symbolic
349 debugging information. */
350 /* Currently, this only has an effect when write_symbols is set to
351 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
352 int use_gnu_debug_info_extensions = 0;
354 /* Nonzero means do optimizations. -O.
355 Particular numeric values stand for particular amounts of optimization;
356 thus, -O2 stores 2 here. However, the optimizations beyond the basic
357 ones are not controlled directly by this variable. Instead, they are
358 controlled by individual `flag_...' variables that are defaulted
359 based on this variable. */
363 /* Nonzero means optimize for size. -Os.
364 The only valid values are zero and non-zero. When optimize_size is
365 non-zero, optimize defaults to 2, but certain individual code
366 bloating optimizations are disabled. */
368 int optimize_size = 0;
370 /* Nonzero if we should exit after parsing options. */
371 static int exit_after_options = 0;
373 /* The FUNCTION_DECL for the function currently being compiled,
374 or 0 if between functions. */
375 tree current_function_decl;
377 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
379 tree current_function_func_begin_label;
381 /* Pointer to function to compute the name to use to print a declaration.
382 DECL is the declaration in question.
383 VERBOSITY determines what information will be printed:
384 0: DECL_NAME, demangled as necessary.
385 1: and scope information.
386 2: and any other information that might be interesting, such as function
387 parameter types in C++. */
389 const char *(*decl_printable_name) PARAMS ((tree, int));
391 /* Pointer to function to compute rtl for a language-specific tree code. */
393 typedef rtx (*lang_expand_expr_t)
394 PARAMS ((union tree_node *, rtx, enum machine_mode,
395 enum expand_modifier modifier));
397 lang_expand_expr_t lang_expand_expr = 0;
399 /* Pointer to function to finish handling an incomplete decl at the
400 end of compilation. */
402 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
404 /* Nonzero if doing dwarf2 duplicate elimination. */
406 int flag_eliminate_dwarf2_dups = 0;
408 /* Nonzero if generating code to do profiling. */
410 int profile_flag = 0;
412 /* Nonzero if generating code to profile program flow graph arcs. */
414 int profile_arc_flag = 0;
416 /* Nonzero if generating info for gcov to calculate line test coverage. */
418 int flag_test_coverage = 0;
420 /* Nonzero indicates that branch taken probabilities should be calculated. */
422 int flag_branch_probabilities = 0;
424 /* Nonzero if basic blocks should be reordered. */
426 int flag_reorder_blocks = 0;
428 /* Nonzero if registers should be renamed. */
430 int flag_rename_registers = 0;
431 int flag_cprop_registers = 0;
433 /* Nonzero for -pedantic switch: warn about anything
434 that standard spec forbids. */
438 /* Temporarily suppress certain warnings.
439 This is set while reading code from a system header file. */
441 int in_system_header = 0;
443 /* Don't print functions as they are compiled. -quiet. */
447 /* Print times taken by the various passes. -ftime-report. */
451 /* Print memory still in use at end of compilation (which may have little
452 to do with peak memory consumption). -fmem-report. */
456 /* Non-zero means to collect statistics which might be expensive
457 and to print them when we are done. */
458 int flag_detailed_statistics = 0;
463 /* Nonzero means `char' should be signed. */
465 int flag_signed_char;
467 /* Nonzero means give an enum type only as many bytes as it needs. */
469 int flag_short_enums;
471 /* Nonzero for -fcaller-saves: allocate values in regs that need to
472 be saved across function calls, if that produces overall better code.
473 Optional now, so people can test it. */
475 #ifdef DEFAULT_CALLER_SAVES
476 int flag_caller_saves = 1;
478 int flag_caller_saves = 0;
481 /* Nonzero if structures and unions should be returned in memory.
483 This should only be defined if compatibility with another compiler or
484 with an ABI is needed, because it results in slower code. */
486 #ifndef DEFAULT_PCC_STRUCT_RETURN
487 #define DEFAULT_PCC_STRUCT_RETURN 1
490 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
492 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
494 /* Nonzero for -fforce-mem: load memory value into a register
495 before arithmetic on it. This makes better cse but slower compilation. */
497 int flag_force_mem = 0;
499 /* Nonzero for -fforce-addr: load memory address into a register before
500 reference to memory. This makes better cse but slower compilation. */
502 int flag_force_addr = 0;
504 /* Nonzero for -fdefer-pop: don't pop args after each function call;
505 instead save them up to pop many calls' args with one insns. */
507 int flag_defer_pop = 0;
509 /* Nonzero for -ffloat-store: don't allocate floats and doubles
510 in extended-precision registers. */
512 int flag_float_store = 0;
514 /* Nonzero for -fcse-follow-jumps:
515 have cse follow jumps to do a more extensive job. */
517 int flag_cse_follow_jumps;
519 /* Nonzero for -fcse-skip-blocks:
520 have cse follow a branch around a block. */
521 int flag_cse_skip_blocks;
523 /* Nonzero for -fexpensive-optimizations:
524 perform miscellaneous relatively-expensive optimizations. */
525 int flag_expensive_optimizations;
527 /* Nonzero for -fthread-jumps:
528 have jump optimize output of loop. */
530 int flag_thread_jumps;
532 /* Nonzero enables strength-reduction in loop.c. */
534 int flag_strength_reduce = 0;
536 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
537 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
538 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
541 int flag_unroll_loops;
543 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
544 This is generally not a win. */
546 int flag_unroll_all_loops;
548 /* Nonzero enables prefetch optimizations for arrays in loops. */
550 int flag_prefetch_loop_arrays;
552 /* Nonzero forces all invariant computations in loops to be moved
555 int flag_move_all_movables = 0;
557 /* Nonzero forces all general induction variables in loops to be
560 int flag_reduce_all_givs = 0;
562 /* Nonzero to perform full register move optimization passes. This is the
565 int flag_regmove = 0;
567 /* Nonzero for -fwritable-strings:
568 store string constants in data segment and don't uniquize them. */
570 int flag_writable_strings = 0;
572 /* Nonzero means don't put addresses of constant functions in registers.
573 Used for compiling the Unix kernel, where strange substitutions are
574 done on the assembly output. */
576 int flag_no_function_cse = 0;
578 /* Nonzero for -fomit-frame-pointer:
579 don't make a frame pointer in simple functions that don't require one. */
581 int flag_omit_frame_pointer = 0;
583 /* Nonzero means place each function into its own section on those platforms
584 which support arbitrary section names and unlimited numbers of sections. */
586 int flag_function_sections = 0;
588 /* ... and similar for data. */
590 int flag_data_sections = 0;
592 /* Nonzero to inhibit use of define_optimization peephole opts. */
594 int flag_no_peephole = 0;
596 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
598 int flag_optimize_sibling_calls = 0;
600 /* Nonzero means the front end generally wants `errno' maintained by math
601 operations, like built-in SQRT. */
603 int flag_errno_math = 1;
605 /* Nonzero means that unsafe floating-point math optimizations are allowed
606 for the sake of speed. IEEE compliance is not guaranteed, and operations
607 are allowed to assume that their arguments and results are "normal"
608 (e.g., nonnegative for SQRT). */
610 int flag_unsafe_math_optimizations = 0;
612 /* Zero means that floating-point math operations cannot generate a
613 (user-visible) trap. This is the case, for example, in nonstop
614 IEEE 754 arithmetic. */
616 int flag_trapping_math = 1;
618 /* 0 means straightforward implementation of complex divide acceptable.
619 1 means wide ranges of inputs must work for complex divide.
620 2 means C99-like requirements for complex divide (not yet implemented). */
622 int flag_complex_divide_method = 0;
624 /* Nonzero means all references through pointers are volatile. */
628 /* Nonzero means treat all global and extern variables as volatile. */
630 int flag_volatile_global;
632 /* Nonzero means treat all static variables as volatile. */
634 int flag_volatile_static;
636 /* Nonzero means just do syntax checking; don't output anything. */
638 int flag_syntax_only = 0;
640 /* Nonzero means perform global cse. */
642 static int flag_gcse;
644 /* Nonzero means to use global dataflow analysis to eliminate
645 useless null pointer tests. */
647 static int flag_delete_null_pointer_checks;
649 /* Nonzero means to do the enhanced load motion during gcse, which trys
650 to hoist loads by not killing them when a store to the same location
653 int flag_gcse_lm = 1;
655 /* Nonzero means to perform store motion after gcse, which will try to
656 move stores closer to the exit block. Its not very effective without
659 int flag_gcse_sm = 1;
661 /* Nonzero means to rerun cse after loop optimization. This increases
662 compilation time about 20% and picks up a few more common expressions. */
664 static int flag_rerun_cse_after_loop;
666 /* Nonzero means to run loop optimizations twice. */
668 int flag_rerun_loop_opt;
670 /* Nonzero for -finline-functions: ok to inline functions that look like
671 good inline candidates. */
673 int flag_inline_functions;
675 /* Nonzero for -fkeep-inline-functions: even if we make a function
676 go inline everywhere, keep its definition around for debugging
679 int flag_keep_inline_functions;
681 /* Nonzero means that functions will not be inlined. */
685 /* Nonzero means that we should emit static const variables
686 regardless of whether or not optimization is turned on. */
688 int flag_keep_static_consts = 1;
690 /* Nonzero means we should be saving declaration info into a .X file. */
692 int flag_gen_aux_info = 0;
694 /* Specified name of aux-info file. */
696 static char *aux_info_file_name;
698 /* Nonzero means make the text shared if supported. */
700 int flag_shared_data;
702 /* Nonzero means schedule into delayed branch slots if supported. */
704 int flag_delayed_branch;
706 /* Nonzero if we are compiling pure (sharable) code.
707 Value is 1 if we are doing reasonable (i.e. simple
708 offset into offset table) pic. Value is 2 if we can
709 only perform register offsets. */
713 /* Nonzero means generate extra code for exception handling and enable
714 exception handling. */
718 /* Nonzero means generate frame unwind info table when supported. */
720 int flag_unwind_tables = 0;
722 /* Nonzero means generate frame unwind info table exact at each insn boundary */
724 int flag_asynchronous_unwind_tables = 0;
726 /* Nonzero means don't place uninitialized global data in common storage
731 /* Nonzero means pretend it is OK to examine bits of target floats,
732 even if that isn't true. The resulting code will have incorrect constants,
733 but the same series of instructions that the native compiler would make. */
735 int flag_pretend_float;
737 /* Nonzero means change certain warnings into errors.
738 Usually these are warnings about failure to conform to some standard. */
740 int flag_pedantic_errors = 0;
742 /* flag_schedule_insns means schedule insns within basic blocks (before
744 flag_schedule_insns_after_reload means schedule insns after
747 int flag_schedule_insns = 0;
748 int flag_schedule_insns_after_reload = 0;
750 /* The following flags have effect only for scheduling before register
753 flag_schedule_interblock means schedule insns accross basic blocks.
754 flag_schedule_speculative means allow speculative motion of non-load insns.
755 flag_schedule_speculative_load means allow speculative motion of some
757 flag_schedule_speculative_load_dangerous allows speculative motion of more
760 int flag_schedule_interblock = 1;
761 int flag_schedule_speculative = 1;
762 int flag_schedule_speculative_load = 0;
763 int flag_schedule_speculative_load_dangerous = 0;
765 int flag_single_precision_constant;
767 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
768 by a cheaper branch on a count register. */
769 int flag_branch_on_count_reg = 1;
771 /* -finhibit-size-directive inhibits output of .size for ELF.
772 This is used only for compiling crtstuff.c,
773 and it may be extended to other effects
774 needed for crtstuff.c on other systems. */
775 int flag_inhibit_size_directive = 0;
777 /* -fverbose-asm causes extra commentary information to be produced in
778 the generated assembly code (to make it more readable). This option
779 is generally only of use to those who actually need to read the
780 generated assembly code (perhaps while debugging the compiler itself).
781 -fno-verbose-asm, the default, causes the extra information
782 to be omitted and is useful when comparing two assembler files. */
784 int flag_verbose_asm = 0;
786 /* -dA causes debug commentary information to be produced in
787 the generated assembly code (to make it more readable). This option
788 is generally only of use to those who actually need to read the
789 generated assembly code (perhaps while debugging the compiler itself).
790 Currently, this switch is only used by dwarfout.c; however, it is intended
791 to be a catchall for printing debug information in the assembler file. */
793 int flag_debug_asm = 0;
795 /* -dP causes the rtl to be emitted as a comment in assembly. */
797 int flag_dump_rtl_in_asm = 0;
799 /* -fgnu-linker specifies use of the GNU linker for initializations.
800 (Or, more generally, a linker that handles initializations.)
801 -fno-gnu-linker says that collect2 will be used. */
803 int flag_gnu_linker = 0;
805 int flag_gnu_linker = 1;
811 /* Enable ssa conditional constant propagation. */
812 int flag_ssa_ccp = 0;
814 /* Enable ssa aggressive dead code elimination. */
815 int flag_ssa_dce = 0;
817 /* Tag all structures with __attribute__(packed). */
818 int flag_pack_struct = 0;
820 /* Emit code to check for stack overflow; also may cause large objects
821 to be allocated dynamically. */
822 int flag_stack_check;
824 /* When non-NULL, indicates that whenever space is allocated on the
825 stack, the resulting stack pointer must not pass this
826 address---that is, for stacks that grow downward, the stack pointer
827 must always be greater than or equal to this address; for stacks
828 that grow upward, the stack pointer must be less than this address.
829 At present, the rtx may be either a REG or a SYMBOL_REF, although
830 the support provided depends on the backend. */
833 /* 0 if pointer arguments may alias each other. True in C.
834 1 if pointer arguments may not alias each other but may alias
836 2 if pointer arguments may not alias each other and may not
837 alias global variables. True in Fortran.
838 This defaults to 0 for C. */
839 int flag_argument_noalias = 0;
841 /* Nonzero if we should do (language-dependent) alias analysis.
842 Typically, this analysis will assume that expressions of certain
843 types do not alias expressions of certain other types. Only used
844 if alias analysis (in general) is enabled. */
845 int flag_strict_aliasing = 0;
847 /* Instrument functions with calls at entry and exit, for profiling. */
848 int flag_instrument_function_entry_exit = 0;
850 /* Nonzero means ignore `#ident' directives. 0 means handle them.
851 On SVR4 targets, it also controls whether or not to emit a
852 string identifying the compiler. */
854 int flag_no_ident = 0;
856 /* This will perform a peephole pass before sched2. */
857 int flag_peephole2 = 0;
859 /* This will try to guess branch probabilities. */
860 int flag_guess_branch_prob = 0;
862 /* -fbounded-pointers causes gcc to compile pointers as composite
863 objects occupying three words: the pointer value, the base address
864 of the referent object, and the address immediately beyond the end
865 of the referent object. The base and extent allow us to perform
866 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
867 int flag_bounded_pointers = 0;
869 /* -fcheck-bounds causes gcc to generate array bounds checks.
870 For C, C++: defaults to value of flag_bounded_pointers.
871 For ObjC: defaults to off.
872 For Java: defaults to on.
873 For Fortran: defaults to off.
874 For CHILL: defaults to off. */
875 int flag_bounds_check = 0;
877 /* This will attempt to merge constant section constants, if 1 only
878 string constants and constants from constant pool, if 2 also constant
880 int flag_merge_constants = 1;
882 /* If one, renumber instruction UIDs to reduce the number of
883 unused UIDs if there are a lot of instructions. If greater than
884 one, unconditionally renumber instruction UIDs. */
885 int flag_renumber_insns = 1;
887 /* Values of the -falign-* flags: how much to align labels in code.
888 0 means `use default', 1 means `don't align'.
889 For each variable, there is an _log variant which is the power
890 of two not less than the variable, for .align output. */
894 int align_loops_max_skip;
897 int align_jumps_max_skip;
899 int align_labels_log;
900 int align_labels_max_skip;
902 int align_functions_log;
904 /* Table of supported debugging formats. */
907 const char *const arg;
908 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
909 constant expression, we use NO_DEBUG in its place. */
910 const enum debug_info_type debug_type;
911 const int use_extensions_p;
912 const char *const description;
916 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
917 N_("Generate debugging info in default format") },
918 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
919 #ifdef DBX_DEBUGGING_INFO
920 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
921 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
923 #ifdef DWARF_DEBUGGING_INFO
924 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
925 { "dwarf+", DWARF_DEBUG, 1,
926 N_("Generate extended DWARF-1 format debug info") },
928 #ifdef DWARF2_DEBUGGING_INFO
929 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
931 #ifdef XCOFF_DEBUGGING_INFO
932 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
933 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
935 #ifdef SDB_DEBUGGING_INFO
936 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
946 const char *description;
948 lang_independent_options;
952 /* Add or remove a leading underscore from user symbols. */
953 int flag_leading_underscore = -1;
955 /* The user symbol prefix after having resolved same. */
956 const char *user_label_prefix;
958 static const param_info lang_independent_params[] = {
959 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
960 { OPTION, DEFAULT, HELP },
961 #include "params.def"
966 /* A default for same. */
967 #ifndef USER_LABEL_PREFIX
968 #define USER_LABEL_PREFIX ""
971 /* Table of language-independent -f options.
972 STRING is the option name. VARIABLE is the address of the variable.
973 ON_VALUE is the value to store in VARIABLE
974 if `-fSTRING' is seen as an option.
975 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
977 lang_independent_options f_options[] =
979 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
980 N_("Perform DWARF2 duplicate elimination") },
981 {"float-store", &flag_float_store, 1,
982 N_("Do not store floats in registers") },
983 {"volatile", &flag_volatile, 1,
984 N_("Consider all mem refs through pointers as volatile") },
985 {"volatile-global", &flag_volatile_global, 1,
986 N_("Consider all mem refs to global data to be volatile") },
987 {"volatile-static", &flag_volatile_static, 1,
988 N_("Consider all mem refs to static data to be volatile") },
989 {"defer-pop", &flag_defer_pop, 1,
990 N_("Defer popping functions args from stack until later") },
991 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
992 N_("When possible do not generate stack frames") },
993 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
994 N_("Optimize sibling and tail recursive calls") },
995 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
996 N_("When running CSE, follow jumps to their targets") },
997 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
998 N_("When running CSE, follow conditional jumps") },
999 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1000 N_("Perform a number of minor, expensive optimizations") },
1001 {"thread-jumps", &flag_thread_jumps, 1,
1002 N_("Perform jump threading optimizations") },
1003 {"strength-reduce", &flag_strength_reduce, 1,
1004 N_("Perform strength reduction optimizations") },
1005 {"unroll-loops", &flag_unroll_loops, 1,
1006 N_("Perform loop unrolling when iteration count is known") },
1007 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1008 N_("Perform loop unrolling for all loops") },
1009 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1010 N_("Generate prefetch instructions, if available, for arrays in loops") },
1011 {"move-all-movables", &flag_move_all_movables, 1,
1012 N_("Force all loop invariant computations out of loops") },
1013 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1014 N_("Strength reduce all loop general induction variables") },
1015 {"writable-strings", &flag_writable_strings, 1,
1016 N_("Store strings in writable data section") },
1017 {"peephole", &flag_no_peephole, 0,
1018 N_("Enable machine specific peephole optimizations") },
1019 {"force-mem", &flag_force_mem, 1,
1020 N_("Copy memory operands into registers before using") },
1021 {"force-addr", &flag_force_addr, 1,
1022 N_("Copy memory address constants into regs before using") },
1023 {"function-cse", &flag_no_function_cse, 0,
1024 N_("Allow function addresses to be held in registers") },
1025 {"inline-functions", &flag_inline_functions, 1,
1026 N_("Integrate simple functions into their callers") },
1027 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1028 N_("Generate code for funcs even if they are fully inlined") },
1029 {"inline", &flag_no_inline, 0,
1030 N_("Pay attention to the 'inline' keyword") },
1031 {"keep-static-consts", &flag_keep_static_consts, 1,
1032 N_("Emit static const variables even if they are not used") },
1033 {"syntax-only", &flag_syntax_only, 1,
1034 N_("Check for syntax errors, then stop") },
1035 {"shared-data", &flag_shared_data, 1,
1036 N_("Mark data as shared rather than private") },
1037 {"caller-saves", &flag_caller_saves, 1,
1038 N_("Enable saving registers around function calls") },
1039 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1040 N_("Return 'short' aggregates in memory, not registers") },
1041 {"reg-struct-return", &flag_pcc_struct_return, 0,
1042 N_("Return 'short' aggregates in registers") },
1043 {"delayed-branch", &flag_delayed_branch, 1,
1044 N_("Attempt to fill delay slots of branch instructions") },
1045 {"gcse", &flag_gcse, 1,
1046 N_("Perform the global common subexpression elimination") },
1047 {"gcse-lm", &flag_gcse_lm, 1,
1048 N_("Perform enhanced load motion during global subexpression elimination") },
1049 {"gcse-sm", &flag_gcse_sm, 1,
1050 N_("Perform store motion after global subexpression elimination") },
1051 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1052 N_("Run CSE pass after loop optimizations") },
1053 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1054 N_("Run the loop optimizer twice") },
1055 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1056 N_("Delete useless null pointer checks") },
1057 {"pretend-float", &flag_pretend_float, 1,
1058 N_("Pretend that host and target use the same FP format") },
1059 {"schedule-insns", &flag_schedule_insns, 1,
1060 N_("Reschedule instructions before register allocation") },
1061 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1062 N_("Reschedule instructions after register allocation") },
1063 {"sched-interblock",&flag_schedule_interblock, 1,
1064 N_("Enable scheduling across basic blocks") },
1065 {"sched-spec",&flag_schedule_speculative, 1,
1066 N_("Allow speculative motion of non-loads") },
1067 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1068 N_("Allow speculative motion of some loads") },
1069 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1070 N_("Allow speculative motion of more loads") },
1071 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1072 N_("Replace add,compare,branch with branch on count reg") },
1073 {"pic", &flag_pic, 1,
1074 N_("Generate position independent code, if possible") },
1075 {"PIC", &flag_pic, 2, ""},
1076 {"exceptions", &flag_exceptions, 1,
1077 N_("Enable exception handling") },
1078 {"unwind-tables", &flag_unwind_tables, 1,
1079 N_("Just generate unwind tables for exception handling") },
1080 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1081 N_("Generate unwind tables exact at each instruction boundary") },
1082 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1083 N_("Support synchronous non-call exceptions") },
1084 {"profile-arcs", &profile_arc_flag, 1,
1085 N_("Insert arc based program profiling code") },
1086 {"test-coverage", &flag_test_coverage, 1,
1087 N_("Create data files needed by gcov") },
1088 {"branch-probabilities", &flag_branch_probabilities, 1,
1089 N_("Use profiling information for branch probabilities") },
1090 {"reorder-blocks", &flag_reorder_blocks, 1,
1091 N_("Reorder basic blocks to improve code placement") },
1092 {"rename-registers", &flag_rename_registers, 1,
1093 N_("Do the register renaming optimization pass") },
1094 {"cprop-registers", &flag_cprop_registers, 1,
1095 N_("Do the register copy-propagation optimization pass") },
1096 {"common", &flag_no_common, 0,
1097 N_("Do not put uninitialized globals in the common section") },
1098 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1099 N_("Do not generate .size directives") },
1100 {"function-sections", &flag_function_sections, 1,
1101 N_("place each function into its own section") },
1102 {"data-sections", &flag_data_sections, 1,
1103 N_("place data items into their own section") },
1104 {"verbose-asm", &flag_verbose_asm, 1,
1105 N_("Add extra commentry to assembler output") },
1106 {"gnu-linker", &flag_gnu_linker, 1,
1107 N_("Output GNU ld formatted global initializers") },
1108 {"regmove", &flag_regmove, 1,
1109 N_("Enables a register move optimization") },
1110 {"optimize-register-move", &flag_regmove, 1,
1111 N_("Do the full regmove optimization pass") },
1112 {"pack-struct", &flag_pack_struct, 1,
1113 N_("Pack structure members together without holes") },
1114 {"stack-check", &flag_stack_check, 1,
1115 N_("Insert stack checking code into the program") },
1116 {"argument-alias", &flag_argument_noalias, 0,
1117 N_("Specify that arguments may alias each other & globals") },
1118 {"argument-noalias", &flag_argument_noalias, 1,
1119 N_("Assume arguments may alias globals but not each other") },
1120 {"argument-noalias-global", &flag_argument_noalias, 2,
1121 N_("Assume arguments do not alias each other or globals") },
1122 {"strict-aliasing", &flag_strict_aliasing, 1,
1123 N_("Assume strict aliasing rules apply") },
1124 {"align-loops", &align_loops, 0,
1125 N_("Align the start of loops") },
1126 {"align-jumps", &align_jumps, 0,
1127 N_("Align labels which are only reached by jumping") },
1128 {"align-labels", &align_labels, 0,
1129 N_("Align all labels") },
1130 {"align-functions", &align_functions, 0,
1131 N_("Align the start of functions") },
1132 {"merge-constants", &flag_merge_constants, 1,
1133 N_("Attempt to merge identical constants accross compilation units") },
1134 {"merge-all-constants", &flag_merge_constants, 2,
1135 N_("Attempt to merge identical constants and constant variables") },
1136 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1137 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1138 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1139 N_("Instrument function entry/exit with profiling calls") },
1140 {"ssa", &flag_ssa, 1,
1141 N_("Enable SSA optimizations") },
1142 {"ssa-ccp", &flag_ssa_ccp, 1,
1143 N_("Enable SSA conditional constant propagation") },
1144 {"ssa-dce", &flag_ssa_dce, 1,
1145 N_("Enable aggressive SSA dead code elimination") },
1146 {"leading-underscore", &flag_leading_underscore, 1,
1147 N_("External symbols have a leading underscore") },
1148 {"ident", &flag_no_ident, 0,
1149 N_("Process #ident directives") },
1150 { "peephole2", &flag_peephole2, 1,
1151 N_("Enables an rtl peephole pass run before sched2") },
1152 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1153 N_("Enables guessing of branch probabilities") },
1154 {"math-errno", &flag_errno_math, 1,
1155 N_("Set errno after built-in math functions") },
1156 {"trapping-math", &flag_trapping_math, 1,
1157 N_("Floating-point operations can trap") },
1158 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1159 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1160 {"bounded-pointers", &flag_bounded_pointers, 1,
1161 N_("Compile pointers as triples: value, base & end") },
1162 {"bounds-check", &flag_bounds_check, 1,
1163 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1164 {"single-precision-constant", &flag_single_precision_constant, 1,
1165 N_("Convert floating point constant to single precision constant") },
1166 {"time-report", &time_report, 1,
1167 N_("Report time taken by each compiler pass at end of run") },
1168 {"mem-report", &mem_report, 1,
1169 N_("Report on permanent memory allocation at end of run") },
1170 { "trapv", &flag_trapv, 1,
1171 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1174 /* Table of language-specific options. */
1176 static const struct lang_opt
1178 const char *const option;
1179 const char *const description;
1181 documented_lang_options[] =
1183 /* In order not to overload the --help output, the convention
1184 used here is to only describe those options which are not
1185 enabled by default. */
1188 N_("Compile just for ISO C89") },
1189 { "-fallow-single-precision",
1190 N_("Do not promote floats to double if using -traditional") },
1192 N_("Determine language standard") },
1194 { "-fsigned-bitfields", "" },
1195 { "-funsigned-bitfields",
1196 N_("Make bitfields by unsigned by default") },
1197 { "-fno-signed-bitfields", "" },
1198 { "-fno-unsigned-bitfields","" },
1200 N_("Make 'char' be signed by default") },
1201 { "-funsigned-char",
1202 N_("Make 'char' be unsigned by default") },
1203 { "-fno-signed-char", "" },
1204 { "-fno-unsigned-char", "" },
1206 { "-ftraditional", "" },
1208 N_("Attempt to support traditional K&R style C") },
1209 { "-fnotraditional", "" },
1210 { "-fno-traditional", "" },
1214 N_("Do not recognize the 'asm' keyword") },
1215 { "-fbuiltin", "" },
1217 N_("Do not recognize any built in functions") },
1219 N_("Assume normal C execution environment") },
1220 { "-fno-hosted", "" },
1222 N_("Assume that standard libraries & main might not exist") },
1223 { "-fno-freestanding", "" },
1224 { "-fcond-mismatch",
1225 N_("Allow different types as args of ? operator") },
1226 { "-fno-cond-mismatch", "" },
1227 { "-fdollars-in-identifiers",
1228 N_("Allow the use of $ inside identifiers") },
1229 { "-fno-dollars-in-identifiers", "" },
1230 { "-fpreprocessed", "" },
1231 { "-fno-preprocessed", "" },
1233 N_("Use the same size for double as for float") },
1234 { "-fno-short-double", "" },
1236 N_("Use the smallest fitting integer to hold enums") },
1237 { "-fno-short-enums", "" },
1239 N_("Override the underlying type for wchar_t to `unsigned short'") },
1240 { "-fno-short-wchar", "" },
1243 N_("Enable most warning messages") },
1244 { "-Wbad-function-cast",
1245 N_("Warn about casting functions to incompatible types") },
1246 { "-Wno-bad-function-cast", "" },
1247 { "-Wno-missing-noreturn", "" },
1248 { "-Wmissing-format-attribute",
1249 N_("Warn about functions which might be candidates for format attributes") },
1250 { "-Wno-missing-format-attribute", "" },
1252 N_("Warn about casts which discard qualifiers") },
1253 { "-Wno-cast-qual", "" },
1254 { "-Wchar-subscripts",
1255 N_("Warn about subscripts whose type is 'char'") },
1256 { "-Wno-char-subscripts", "" },
1258 N_("Warn if nested comments are detected") },
1259 { "-Wno-comment", "" },
1261 N_("Warn if nested comments are detected") },
1262 { "-Wno-comments", "" },
1264 N_("Warn about possibly confusing type conversions") },
1265 { "-Wno-conversion", "" },
1267 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1268 { "-Wno-format", "" },
1269 { "-Wformat-y2k", "" },
1270 { "-Wno-format-y2k",
1271 N_("Don't warn about strftime formats yielding 2 digit years") },
1272 { "-Wformat-extra-args", "" },
1273 { "-Wno-format-extra-args",
1274 N_("Don't warn about too many arguments to format functions") },
1275 { "-Wformat-nonliteral",
1276 N_("Warn about non-string-literal format strings") },
1277 { "-Wno-format-nonliteral", "" },
1278 { "-Wformat-security",
1279 N_("Warn about possible security problems with format functions") },
1280 { "-Wno-format-security", "" },
1281 { "-Wimplicit-function-declaration",
1282 N_("Warn about implicit function declarations") },
1283 { "-Wno-implicit-function-declaration", "" },
1284 { "-Werror-implicit-function-declaration", "" },
1286 N_("Warn when a declaration does not specify a type") },
1287 { "-Wno-implicit-int", "" },
1288 { "-Wimplicit", "" },
1289 { "-Wno-implicit", "" },
1291 N_("Warn about the use of the #import directive") },
1292 { "-Wno-import", "" },
1293 { "-Wlong-long","" },
1295 N_("Do not warn about using 'long long' when -pedantic") },
1297 N_("Warn about suspicious declarations of main") },
1298 { "-Wno-main", "" },
1299 { "-Wmissing-braces",
1300 N_("Warn about possibly missing braces around initializers") },
1301 { "-Wno-missing-braces", "" },
1302 { "-Wmissing-declarations",
1303 N_("Warn about global funcs without previous declarations") },
1304 { "-Wno-missing-declarations", "" },
1305 { "-Wmissing-prototypes",
1306 N_("Warn about global funcs without prototypes") },
1307 { "-Wno-missing-prototypes", "" },
1309 N_("Warn about use of multicharacter literals") },
1310 { "-Wno-multichar", "" },
1311 { "-Wnested-externs",
1312 N_("Warn about externs not at file scope level") },
1313 { "-Wno-nested-externs", "" },
1315 N_("Warn about possible missing parentheses") },
1316 { "-Wno-parentheses", "" },
1317 { "-Wsequence-point",
1318 N_("Warn about possible violations of sequence point rules") },
1319 { "-Wno-sequence-point", "" },
1320 { "-Wpointer-arith",
1321 N_("Warn about function pointer arithmetic") },
1322 { "-Wno-pointer-arith", "" },
1323 { "-Wredundant-decls",
1324 N_("Warn about multiple declarations of the same object") },
1325 { "-Wno-redundant-decls", "" },
1327 N_("Warn about signed/unsigned comparisons") },
1328 { "-Wno-sign-compare", "" },
1330 N_("Warn about testing equality of floating point numbers") },
1331 { "-Wno-float-equal", "" },
1332 { "-Wunknown-pragmas",
1333 N_("Warn about unrecognized pragmas") },
1334 { "-Wno-unknown-pragmas", "" },
1335 { "-Wstrict-prototypes",
1336 N_("Warn about non-prototyped function decls") },
1337 { "-Wno-strict-prototypes", "" },
1339 N_("Warn about constructs whose meaning change in ISO C") },
1340 { "-Wno-traditional", "" },
1342 N_("Warn when trigraphs are encountered") },
1343 { "-Wno-trigraphs", "" },
1345 { "-Wno-undef", "" },
1346 { "-Wwrite-strings",
1347 N_("Mark strings as 'const char *'") },
1348 { "-Wno-write-strings", "" },
1350 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1352 #include "options.h"
1356 /* Here is a table, controlled by the tm.h file, listing each -m switch
1357 and which bits in `target_switches' it should set or clear.
1358 If VALUE is positive, it is bits to set.
1359 If VALUE is negative, -VALUE is bits to clear.
1360 (The sign bit is not used so there is no confusion.) */
1364 const char *const name;
1366 const char *const description;
1368 target_switches [] = TARGET_SWITCHES;
1370 /* This table is similar, but allows the switch to have a value. */
1372 #ifdef TARGET_OPTIONS
1375 const char *const prefix;
1376 const char **const variable;
1377 const char *const description;
1379 target_options [] = TARGET_OPTIONS;
1382 /* Options controlling warnings. */
1384 /* Don't print warning messages. -w. */
1386 int inhibit_warnings = 0;
1388 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1390 int warn_system_headers = 0;
1392 /* Print various extra warnings. -W. */
1394 int extra_warnings = 0;
1396 /* Treat warnings as errors. -Werror. */
1398 int warnings_are_errors = 0;
1400 /* Nonzero to warn about unused variables, functions et.al. */
1402 int warn_unused_function;
1403 int warn_unused_label;
1404 int warn_unused_parameter;
1405 int warn_unused_variable;
1406 int warn_unused_value;
1408 /* Nonzero to warn about code which is never reached. */
1410 int warn_notreached;
1412 /* Nonzero to warn about variables used before they are initialized. */
1414 int warn_uninitialized;
1416 /* Nonzero means warn about all declarations which shadow others. */
1420 /* Warn if a switch on an enum fails to have a case for every enum value. */
1424 /* Nonzero means warn about function definitions that default the return type
1425 or that use a null return and have a return-type other than void. */
1427 int warn_return_type;
1429 /* Nonzero means warn about pointer casts that increase the required
1430 alignment of the target type (and might therefore lead to a crash
1431 due to a misaligned access). */
1433 int warn_cast_align;
1435 /* Nonzero means warn about any objects definitions whose size is larger
1436 than N bytes. Also want about function definitions whose returned
1437 values are larger than N bytes. The value N is in `larger_than_size'. */
1439 int warn_larger_than;
1440 HOST_WIDE_INT larger_than_size;
1442 /* Nonzero means warn if inline function is too large. */
1446 /* Warn if a function returns an aggregate,
1447 since there are often incompatible calling conventions for doing this. */
1449 int warn_aggregate_return;
1451 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1455 /* Warn when gcc pads a structure to an alignment boundary. */
1459 /* Warn when an optimization pass is disabled. */
1461 int warn_disabled_optimization;
1463 /* Warn about functions which might be candidates for attribute noreturn. */
1465 int warn_missing_noreturn;
1467 /* Likewise for -W. */
1469 lang_independent_options W_options[] =
1471 {"unused-function", &warn_unused_function, 1,
1472 N_("Warn when a function is unused") },
1473 {"unused-label", &warn_unused_label, 1,
1474 N_("Warn when a label is unused") },
1475 {"unused-parameter", &warn_unused_parameter, 1,
1476 N_("Warn when a function parameter is unused") },
1477 {"unused-variable", &warn_unused_variable, 1,
1478 N_("Warn when a variable is unused") },
1479 {"unused-value", &warn_unused_value, 1,
1480 N_("Warn when an expression value is unused") },
1481 {"system-headers", &warn_system_headers, 1,
1482 N_("Do not suppress warnings from system headers") },
1483 {"error", &warnings_are_errors, 1,
1484 N_("Treat all warnings as errors") },
1485 {"shadow", &warn_shadow, 1,
1486 N_("Warn when one local variable shadows another") },
1487 {"switch", &warn_switch, 1,
1488 N_("Warn about enumerated switches missing a specific case") },
1489 {"aggregate-return", &warn_aggregate_return, 1,
1490 N_("Warn about returning structures, unions or arrays") },
1491 {"cast-align", &warn_cast_align, 1,
1492 N_("Warn about pointer casts which increase alignment") },
1493 {"unreachable-code", &warn_notreached, 1,
1494 N_("Warn about code that will never be executed") },
1495 {"uninitialized", &warn_uninitialized, 1,
1496 N_("Warn about uninitialized automatic variables") },
1497 {"inline", &warn_inline, 1,
1498 N_("Warn when an inlined function cannot be inlined") },
1499 {"packed", &warn_packed, 1,
1500 N_("Warn when the packed attribute has no effect on struct layout") },
1501 {"padded", &warn_padded, 1,
1502 N_("Warn when padding is required to align struct members") },
1503 {"disabled-optimization", &warn_disabled_optimization, 1,
1504 N_("Warn when an optimization pass is disabled") },
1505 {"missing-noreturn", &warn_missing_noreturn, 1,
1506 N_("Warn about functions which might be candidates for attribute noreturn") }
1510 set_Wunused (setting)
1513 warn_unused_function = setting;
1514 warn_unused_label = setting;
1515 /* Unused function parameter warnings are reported when either ``-W
1516 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1517 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1519 warn_unused_parameter = 0;
1520 else if (!warn_unused_parameter)
1521 warn_unused_parameter = -1;
1522 warn_unused_variable = setting;
1523 warn_unused_value = setting;
1526 /* The following routines are useful in setting all the flags that
1527 -ffast-math and -fno-fast-math imply. */
1530 set_fast_math_flags ()
1532 flag_trapping_math = 0;
1533 flag_unsafe_math_optimizations = 1;
1534 flag_errno_math = 0;
1538 set_no_fast_math_flags ()
1540 flag_trapping_math = 1;
1541 flag_unsafe_math_optimizations = 0;
1542 flag_errno_math = 1;
1546 /* Output files for assembler code (real compiler output)
1547 and debugging dumps. */
1550 FILE *aux_info_file;
1551 FILE *rtl_dump_file = NULL;
1553 /* Decode the string P as an integral parameter.
1554 If the string is indeed an integer return its numeric value else
1555 issue an Invalid Option error for the option PNAME and return DEFVAL.
1556 If PNAME is zero just return DEFVAL, do not call error. */
1559 read_integral_parameter (p, pname, defval)
1564 const char *endp = p;
1568 if (ISDIGIT (*endp))
1577 error ("invalid option `%s'", pname);
1585 /* This is the default decl_printable_name function. */
1588 decl_name (decl, verbosity)
1590 int verbosity ATTRIBUTE_UNUSED;
1592 return IDENTIFIER_POINTER (DECL_NAME (decl));
1596 /* This calls abort and is used to avoid problems when abort if a macro.
1597 It is used when we need to pass the address of abort. */
1605 /* When `malloc.c' is compiled with `rcheck' defined,
1606 it calls this function to report clobberage. */
1610 const char *s ATTRIBUTE_UNUSED;
1615 /* Return the logarithm of X, base 2, considering X unsigned,
1616 if X is a power of 2. Otherwise, returns -1.
1618 This should be used via the `exact_log2' macro. */
1622 unsigned HOST_WIDE_INT x;
1625 /* Test for 0 or a power of 2. */
1626 if (x == 0 || x != (x & -x))
1628 while ((x >>= 1) != 0)
1633 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1634 If X is 0, return -1.
1636 This should be used via the floor_log2 macro. */
1640 unsigned HOST_WIDE_INT x;
1649 static int float_handler_set;
1651 jmp_buf float_handler;
1653 /* Signals actually come here. */
1656 float_signal (signo)
1657 /* If this is missing, some compilers complain. */
1658 int signo ATTRIBUTE_UNUSED;
1660 if (float_handled == 0)
1661 crash_signal (signo);
1664 /* On System-V derived systems, we must reinstall the signal handler.
1665 This is harmless on BSD-derived systems. */
1666 signal (SIGFPE, float_signal);
1667 longjmp (float_handler, 1);
1670 /* Specify where to longjmp to when a floating arithmetic error happens.
1671 If HANDLER is 0, it means don't handle the errors any more. */
1674 set_float_handler (handler)
1677 float_handled = (handler != 0);
1679 memcpy (float_handler, handler, sizeof (float_handler));
1681 if (float_handled && ! float_handler_set)
1683 signal (SIGFPE, float_signal);
1684 float_handler_set = 1;
1688 /* This is a wrapper function for code which might elicit an
1689 arithmetic exception. That code should be passed in as a function
1690 pointer FN, and one argument DATA. DATA is usually a struct which
1691 contains the real input and output for function FN. This function
1692 returns 0 (failure) if longjmp was called (i.e. an exception
1693 occurred.) It returns 1 (success) otherwise. */
1696 do_float_handler (fn, data)
1697 void (*fn) PARAMS ((PTR));
1704 /* We got here via longjmp () caused by an exception in function
1706 set_float_handler (NULL);
1710 set_float_handler (buf);
1712 set_float_handler (NULL);
1716 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1717 into ICE messages, which is much more user friendly. */
1720 crash_signal (signo)
1723 internal_error ("internal error: %s", strsignal (signo));
1726 /* Strip off a legitimate source ending from the input string NAME of
1727 length LEN. Rather than having to know the names used by all of
1728 our front ends, we strip off an ending of a period followed by
1729 up to five characters. (Java uses ".class".) */
1732 strip_off_ending (name, len)
1737 for (i = 2; i < 6 && len > i; i++)
1739 if (name[len - i] == '.')
1741 name[len - i] = '\0';
1747 /* Output a quoted string. */
1750 output_quoted_string (asm_file, string)
1754 #ifdef OUTPUT_QUOTED_STRING
1755 OUTPUT_QUOTED_STRING (asm_file, string);
1759 putc ('\"', asm_file);
1760 while ((c = *string++) != 0)
1762 if (c == '\"' || c == '\\')
1763 putc ('\\', asm_file);
1766 putc ('\"', asm_file);
1770 /* Output a file name in the form wanted by System V. */
1773 output_file_directive (asm_file, input_name)
1775 const char *input_name;
1777 int len = strlen (input_name);
1778 const char *na = input_name + len;
1780 /* NA gets INPUT_NAME sans directory names. */
1781 while (na > input_name)
1783 if (IS_DIR_SEPARATOR (na[-1]))
1788 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1789 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1791 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1792 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1794 fprintf (asm_file, "\t.file\t");
1795 output_quoted_string (asm_file, na);
1796 fputc ('\n', asm_file);
1801 /* Routine to open a dump file. Return true if the dump file is enabled. */
1804 open_dump_file (index, decl)
1805 enum dump_file_index index;
1809 const char *open_arg;
1812 if (! dump_file[index].enabled)
1815 timevar_push (TV_DUMP);
1816 if (rtl_dump_file != NULL)
1817 fclose (rtl_dump_file);
1819 sprintf (seq, DUMPFILE_FORMAT, index);
1821 if (! dump_file[index].initialized)
1823 /* If we've not initialized the files, do so now. */
1824 if (graph_dump_format != no_graph
1825 && dump_file[index].graph_dump_p)
1827 dump_name = concat (seq, dump_file[index].extension, NULL);
1828 clean_graph_dump_file (dump_base_name, dump_name);
1831 dump_file[index].initialized = 1;
1837 dump_name = concat (dump_base_name, seq,
1838 dump_file[index].extension, NULL);
1840 rtl_dump_file = fopen (dump_name, open_arg);
1841 if (rtl_dump_file == NULL)
1842 fatal_io_error ("can't open %s", dump_name);
1847 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1848 decl_printable_name (decl, 2));
1850 timevar_pop (TV_DUMP);
1854 /* Routine to close a dump file. */
1857 close_dump_file (index, func, insns)
1858 enum dump_file_index index;
1859 void (*func) PARAMS ((FILE *, rtx));
1862 if (! rtl_dump_file)
1865 timevar_push (TV_DUMP);
1867 && graph_dump_format != no_graph
1868 && dump_file[index].graph_dump_p)
1873 sprintf (seq, DUMPFILE_FORMAT, index);
1874 suffix = concat (seq, dump_file[index].extension, NULL);
1875 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1880 func (rtl_dump_file, insns);
1882 fflush (rtl_dump_file);
1883 fclose (rtl_dump_file);
1885 rtl_dump_file = NULL;
1886 timevar_pop (TV_DUMP);
1889 /* Do any final processing required for the declarations in VEC, of
1890 which there are LEN. We write out inline functions and variables
1891 that have been deferred until this point, but which are required.
1892 Returns non-zero if anything was put out. */
1895 wrapup_global_declarations (vec, len)
1902 int output_something = 0;
1904 for (i = 0; i < len; i++)
1908 /* We're not deferring this any longer. */
1909 DECL_DEFER_OUTPUT (decl) = 0;
1911 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1912 && incomplete_decl_finalize_hook != 0)
1913 (*incomplete_decl_finalize_hook) (decl);
1916 /* Now emit any global variables or functions that we have been
1917 putting off. We need to loop in case one of the things emitted
1918 here references another one which comes earlier in the list. */
1922 for (i = 0; i < len; i++)
1926 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1929 /* Don't write out static consts, unless we still need them.
1931 We also keep static consts if not optimizing (for debugging),
1932 unless the user specified -fno-keep-static-consts.
1933 ??? They might be better written into the debug information.
1934 This is possible when using DWARF.
1936 A language processor that wants static constants to be always
1937 written out (even if it is not used) is responsible for
1938 calling rest_of_decl_compilation itself. E.g. the C front-end
1939 calls rest_of_decl_compilation from finish_decl.
1940 One motivation for this is that is conventional in some
1941 environments to write things like:
1942 static const char rcsid[] = "... version string ...";
1943 intending to force the string to be in the executable.
1945 A language processor that would prefer to have unneeded
1946 static constants "optimized away" would just defer writing
1947 them out until here. E.g. C++ does this, because static
1948 constants are often defined in header files.
1950 ??? A tempting alternative (for both C and C++) would be
1951 to force a constant to be written if and only if it is
1952 defined in a main file, as opposed to an include file. */
1954 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1955 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl))
1956 && !DECL_COMDAT (decl))
1958 && flag_keep_static_consts
1959 && !DECL_ARTIFICIAL (decl))
1960 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1963 rest_of_decl_compilation (decl, NULL, 1, 1);
1966 if (TREE_CODE (decl) == FUNCTION_DECL
1967 && DECL_INITIAL (decl) != 0
1968 && DECL_SAVED_INSNS (decl) != 0
1969 && (flag_keep_inline_functions
1970 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1971 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1974 output_inline_function (decl);
1979 output_something = 1;
1983 return output_something;
1986 /* Issue appropriate warnings for the global declarations in VEC (of
1987 which there are LEN). Output debugging information for them. */
1990 check_global_declarations (vec, len)
1997 for (i = 0; i < len; i++)
2001 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2002 && ! TREE_ASM_WRITTEN (decl))
2003 /* Cancel the RTL for this decl so that, if debugging info
2004 output for global variables is still to come,
2005 this one will be omitted. */
2006 SET_DECL_RTL (decl, NULL_RTX);
2008 /* Warn about any function
2009 declared static but not defined.
2010 We don't warn about variables,
2011 because many programs have static variables
2012 that exist only to get some text into the object file. */
2013 if (TREE_CODE (decl) == FUNCTION_DECL
2014 && (warn_unused_function
2015 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2016 && DECL_INITIAL (decl) == 0
2017 && DECL_EXTERNAL (decl)
2018 && ! DECL_ARTIFICIAL (decl)
2019 && ! TREE_PUBLIC (decl))
2021 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2022 pedwarn_with_decl (decl,
2023 "`%s' used but never defined");
2025 warning_with_decl (decl,
2026 "`%s' declared `static' but never defined");
2027 /* This symbol is effectively an "extern" declaration now. */
2028 TREE_PUBLIC (decl) = 1;
2029 assemble_external (decl);
2032 /* Warn about static fns or vars defined but not used,
2033 but not about inline functions or static consts
2034 since defining those in header files is normal practice. */
2035 if (((warn_unused_function
2036 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2037 || (warn_unused_variable
2038 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2039 && ! DECL_IN_SYSTEM_HEADER (decl)
2040 && ! DECL_EXTERNAL (decl)
2041 && ! TREE_PUBLIC (decl)
2042 && ! TREE_USED (decl)
2043 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2044 /* The TREE_USED bit for file-scope decls
2045 is kept in the identifier, to handle multiple
2046 external decls in different scopes. */
2047 && ! TREE_USED (DECL_NAME (decl)))
2048 warning_with_decl (decl, "`%s' defined but not used");
2050 timevar_push (TV_SYMOUT);
2051 (*debug_hooks->global_decl) (decl);
2052 timevar_pop (TV_SYMOUT);
2056 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2057 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2058 INPUT_FILENAME and LINENO accordingly. */
2061 push_srcloc (file, line)
2065 struct file_stack *fs;
2067 if (input_file_stack)
2069 input_file_stack->name = input_filename;
2070 input_file_stack->line = lineno;
2073 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2074 fs->name = input_filename = file;
2075 fs->line = lineno = line;
2076 fs->indent_level = 0;
2077 fs->next = input_file_stack;
2078 input_file_stack = fs;
2079 input_file_stack_tick++;
2082 /* Pop the top entry off the stack of presently open source files.
2083 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2089 struct file_stack *fs;
2091 fs = input_file_stack;
2092 input_file_stack = fs->next;
2094 input_file_stack_tick++;
2095 /* The initial source file is never popped. */
2096 if (!input_file_stack)
2098 input_filename = input_file_stack->name;
2099 lineno = input_file_stack->line;
2102 /* Compile an entire translation unit. Write a file of assembly
2103 output and various debugging dumps. */
2110 /* Initialize yet another pass. */
2112 init_final (main_input_filename);
2113 init_branch_prob (dump_base_name);
2115 timevar_push (TV_PARSE);
2117 /* Call the parser, which parses the entire file
2118 (calling rest_of_compilation for each function). */
2121 /* In case there were missing block closers,
2122 get us back to the global binding level. */
2123 (*lang_hooks.clear_binding_stack) ();
2125 /* Compilation is now finished except for writing
2126 what's left of the symbol table output. */
2128 timevar_pop (TV_PARSE);
2130 if (flag_syntax_only)
2133 globals = getdecls ();
2135 /* Really define vars that have had only a tentative definition.
2136 Really output inline functions that must actually be callable
2137 and have not been output so far. */
2140 int len = list_length (globals);
2141 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2145 /* Process the decls in reverse order--earliest first.
2146 Put them into VEC from back to front, then take out from front. */
2148 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2149 vec[len - i - 1] = decl;
2151 wrapup_global_declarations (vec, len);
2153 /* This must occur after the loop to output deferred functions. Else
2154 the profiler initializer would not be emitted if all the functions
2155 in this compilation unit were deferred.
2157 output_func_start_profiler can not cause any additional functions or
2158 data to need to be output, so it need not be in the deferred function
2160 output_func_start_profiler ();
2162 check_global_declarations (vec, len);
2168 /* Write out any pending weak symbol declarations. */
2172 /* Do dbx symbols. */
2173 timevar_push (TV_SYMOUT);
2175 #ifdef DWARF2_UNWIND_INFO
2176 if (dwarf2out_do_frame ())
2177 dwarf2out_frame_finish ();
2180 (*debug_hooks->finish) (main_input_filename);
2181 timevar_pop (TV_SYMOUT);
2183 /* Output some stuff at end of file if nec. */
2185 dw2_output_indirect_constants ();
2187 end_final (dump_base_name);
2189 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2191 timevar_push (TV_DUMP);
2192 open_dump_file (DFI_bp, NULL);
2196 close_dump_file (DFI_bp, NULL, NULL_RTX);
2197 timevar_pop (TV_DUMP);
2201 ASM_FILE_END (asm_out_file);
2204 /* Attach a special .ident directive to the end of the file to identify
2205 the version of GCC which compiled this code. The format of the .ident
2206 string is patterned after the ones produced by native SVR4 compilers. */
2209 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2210 IDENT_ASM_OP, version_string);
2213 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2215 timevar_push (TV_DUMP);
2216 dump_combine_total_stats (rtl_dump_file);
2217 close_dump_file (DFI_combine, NULL, NULL_RTX);
2218 timevar_pop (TV_DUMP);
2222 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2223 and TYPE_DECL nodes.
2225 This does nothing for local (non-static) variables, unless the
2226 variable is a register variable with an ASMSPEC. In that case, or
2227 if the variable is not an automatic, it sets up the RTL and
2228 outputs any assembler code (label definition, storage allocation
2229 and initialization).
2231 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2232 the assembler symbol name to be used. TOP_LEVEL is nonzero
2233 if this declaration is not within a function. */
2236 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2238 const char *asmspec;
2242 /* Declarations of variables, and of functions defined elsewhere. */
2244 /* The most obvious approach, to put an #ifndef around where
2245 this macro is used, doesn't work since it's inside a macro call. */
2246 #ifndef ASM_FINISH_DECLARE_OBJECT
2247 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2250 /* Forward declarations for nested functions are not "external",
2251 but we need to treat them as if they were. */
2252 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2253 || TREE_CODE (decl) == FUNCTION_DECL)
2255 timevar_push (TV_VARCONST);
2257 make_decl_rtl (decl, asmspec);
2258 /* Don't output anything
2259 when a tentative file-scope definition is seen.
2260 But at end of compilation, do output code for them. */
2261 if (at_end || !DECL_DEFER_OUTPUT (decl))
2262 assemble_variable (decl, top_level, at_end, 0);
2263 if (decl == last_assemble_variable_decl)
2265 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2268 timevar_pop (TV_VARCONST);
2270 else if (DECL_REGISTER (decl) && asmspec != 0)
2272 if (decode_reg_name (asmspec) >= 0)
2274 SET_DECL_RTL (decl, NULL_RTX);
2275 make_decl_rtl (decl, asmspec);
2279 error ("invalid register name `%s' for register variable", asmspec);
2280 DECL_REGISTER (decl) = 0;
2285 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2286 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2287 && TREE_CODE (decl) == TYPE_DECL)
2289 timevar_push (TV_SYMOUT);
2290 dbxout_symbol (decl, 0);
2291 timevar_pop (TV_SYMOUT);
2294 #ifdef SDB_DEBUGGING_INFO
2295 else if (write_symbols == SDB_DEBUG && top_level
2296 && TREE_CODE (decl) == TYPE_DECL)
2298 timevar_push (TV_SYMOUT);
2299 sdbout_symbol (decl, 0);
2300 timevar_pop (TV_SYMOUT);
2305 /* Called after finishing a record, union or enumeral type. */
2308 rest_of_type_compilation (type, toplev)
2309 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2313 tree type ATTRIBUTE_UNUSED;
2314 int toplev ATTRIBUTE_UNUSED;
2317 timevar_push (TV_SYMOUT);
2318 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2319 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2320 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2322 #ifdef SDB_DEBUGGING_INFO
2323 if (write_symbols == SDB_DEBUG)
2324 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2326 #ifdef DWARF2_DEBUGGING_INFO
2327 if ((write_symbols == DWARF2_DEBUG
2328 || write_symbols == VMS_AND_DWARF2_DEBUG)
2330 dwarf2out_decl (TYPE_STUB_DECL (type));
2332 timevar_pop (TV_SYMOUT);
2335 /* This is called from finish_function (within yyparse)
2336 after each top-level definition is parsed.
2337 It is supposed to compile that function or variable
2338 and output the assembler code for it.
2339 After we return, the tree storage is freed. */
2342 rest_of_compilation (decl)
2348 int rebuild_label_notes_after_reload;
2349 int register_life_up_to_date;
2351 timevar_push (TV_REST_OF_COMPILATION);
2353 /* Now that we're out of the frontend, we shouldn't have any more
2354 CONCATs anywhere. */
2355 generating_concat_p = 0;
2357 /* When processing delayed functions, prepare_function_start() won't
2358 have been run to re-initialize it. */
2359 cse_not_expected = ! optimize;
2361 /* First, make sure that NOTE_BLOCK is set correctly for each
2362 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2363 if (!cfun->x_whole_function_mode_p)
2366 /* Then remove any notes we don't need. That will make iterating
2367 over the instruction sequence faster, and allow the garbage
2368 collector to reclaim the memory used by the notes. */
2369 remove_unnecessary_notes ();
2371 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2372 tree in sensible shape. So, we just recalculate it here. */
2373 if (cfun->x_whole_function_mode_p)
2378 /* If we are reconsidering an inline function
2379 at the end of compilation, skip the stuff for making it inline. */
2381 if (DECL_SAVED_INSNS (decl) == 0)
2387 /* If this is nested inside an inlined external function, pretend
2388 it was only declared. Since we cannot inline such functions,
2389 generating code for this one is not only not necessary but will
2390 confuse some debugging output writers. */
2391 for (parent = DECL_CONTEXT (current_function_decl);
2392 parent != NULL_TREE;
2393 parent = get_containing_scope (parent))
2394 if (TREE_CODE (parent) == FUNCTION_DECL
2395 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2397 DECL_INITIAL (decl) = 0;
2398 goto exit_rest_of_compilation;
2401 /* If requested, consider whether to make this function inline. */
2402 if ((DECL_INLINE (decl) && !flag_no_inline)
2403 || flag_inline_functions)
2405 timevar_push (TV_INTEGRATION);
2406 lose = function_cannot_inline_p (decl);
2407 timevar_pop (TV_INTEGRATION);
2408 if (lose || ! optimize)
2410 if (warn_inline && DECL_INLINE (decl))
2411 warning_with_decl (decl, lose);
2412 DECL_ABSTRACT_ORIGIN (decl) = 0;
2413 /* Don't really compile an extern inline function.
2414 If we can't make it inline, pretend
2415 it was only declared. */
2416 if (DECL_EXTERNAL (decl))
2418 DECL_INITIAL (decl) = 0;
2419 goto exit_rest_of_compilation;
2423 /* ??? Note that this has the effect of making it look
2424 like "inline" was specified for a function if we choose
2425 to inline it. This isn't quite right, but it's
2426 probably not worth the trouble to fix. */
2427 inlinable = DECL_INLINE (decl) = 1;
2430 insns = get_insns ();
2432 /* Dump the rtl code if we are dumping rtl. */
2434 if (open_dump_file (DFI_rtl, decl))
2436 if (DECL_SAVED_INSNS (decl))
2437 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2438 close_dump_file (DFI_rtl, print_rtl, insns);
2441 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2442 sorts of eh initialization. Delay this until after the
2443 initial rtl dump so that we can see the original nesting. */
2444 convert_from_eh_region_ranges ();
2446 /* If function is inline, and we don't yet know whether to
2447 compile it by itself, defer decision till end of compilation.
2448 finish_compilation will call rest_of_compilation again
2449 for those functions that need to be output. Also defer those
2450 functions that we are supposed to defer. */
2453 || (DECL_INLINE (decl)
2454 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2455 && ! flag_keep_inline_functions)
2456 || DECL_EXTERNAL (decl))))
2457 DECL_DEFER_OUTPUT (decl) = 1;
2459 if (DECL_INLINE (decl))
2460 /* DWARF wants separate debugging info for abstract and
2461 concrete instances of all inline functions, including those
2462 declared inline but not inlined, and those inlined even
2463 though they weren't declared inline. Conveniently, that's
2464 what DECL_INLINE means at this point. */
2465 (*debug_hooks->deferred_inline_function) (decl);
2467 if (DECL_DEFER_OUTPUT (decl))
2469 /* If -Wreturn-type, we have to do a bit of compilation. We just
2470 want to call cleanup the cfg to figure out whether or not we can
2471 fall off the end of the function; we do the minimum amount of
2472 work necessary to make that safe. */
2473 if (warn_return_type)
2475 int saved_optimize = optimize;
2478 rebuild_jump_labels (insns);
2479 find_exception_handler_labels ();
2480 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2481 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2482 optimize = saved_optimize;
2484 /* CFG is no longer maintained up-to-date. */
2485 free_bb_for_insn ();
2488 current_function_nothrow = nothrow_function_p ();
2489 if (current_function_nothrow)
2490 /* Now we know that this can't throw; set the flag for the benefit
2491 of other functions later in this translation unit. */
2492 TREE_NOTHROW (current_function_decl) = 1;
2494 timevar_push (TV_INTEGRATION);
2495 save_for_inline (decl);
2496 timevar_pop (TV_INTEGRATION);
2497 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2498 goto exit_rest_of_compilation;
2501 /* If specified extern inline but we aren't inlining it, we are
2502 done. This goes for anything that gets here with DECL_EXTERNAL
2503 set, not just things with DECL_INLINE. */
2504 if (DECL_EXTERNAL (decl))
2505 goto exit_rest_of_compilation;
2510 /* Initialize some variables used by the optimizers. */
2511 init_function_for_compilation ();
2513 if (! DECL_DEFER_OUTPUT (decl))
2514 TREE_ASM_WRITTEN (decl) = 1;
2516 /* Now that integrate will no longer see our rtl, we need not
2517 distinguish between the return value of this function and the
2518 return value of called functions. Also, we can remove all SETs
2519 of subregs of hard registers; they are only here because of
2520 integrate. Also, we can now initialize pseudos intended to
2521 carry magic hard reg data throughout the function. */
2522 rtx_equal_function_value_matters = 0;
2523 purge_hard_subreg_sets (get_insns ());
2524 emit_initial_value_sets ();
2526 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2527 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2528 goto exit_rest_of_compilation;
2530 /* We may have potential sibling or tail recursion sites. Select one
2531 (of possibly multiple) methods of performing the call. */
2532 if (flag_optimize_sibling_calls)
2534 timevar_push (TV_JUMP);
2535 open_dump_file (DFI_sibling, decl);
2537 optimize_sibling_and_tail_recursive_calls ();
2539 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2540 timevar_pop (TV_JUMP);
2543 /* Complete generation of exception handling code. */
2544 find_exception_handler_labels ();
2547 timevar_push (TV_JUMP);
2548 open_dump_file (DFI_eh, decl);
2550 finish_eh_generation ();
2552 close_dump_file (DFI_eh, print_rtl, get_insns ());
2553 timevar_pop (TV_JUMP);
2557 /* If we are doing position-independent code generation, now
2558 is the time to output special prologues and epilogues.
2559 We do not want to do this earlier, because it just clutters
2560 up inline functions with meaningless insns. */
2565 insns = get_insns ();
2567 /* Copy any shared structure that should not be shared. */
2568 unshare_all_rtl (current_function_decl, insns);
2570 #ifdef SETJMP_VIA_SAVE_AREA
2571 /* This must be performed before virtual register instantiation. */
2572 if (current_function_calls_alloca)
2573 optimize_save_area_alloca (insns);
2576 /* Instantiate all virtual registers. */
2577 instantiate_virtual_regs (current_function_decl, insns);
2579 open_dump_file (DFI_jump, decl);
2581 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2582 are initialized and to compute whether control can drop off the end
2585 timevar_push (TV_JUMP);
2586 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2587 before jump optimization switches branch directions. */
2588 expected_value_to_br_prob ();
2590 reg_scan (insns, max_reg_num (), 0);
2591 rebuild_jump_labels (insns);
2592 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2593 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP);
2595 /* CFG is no longer maintained up-to-date. */
2596 free_bb_for_insn ();
2597 copy_loop_headers (insns);
2598 purge_line_number_notes (insns);
2600 timevar_pop (TV_JUMP);
2602 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2603 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2605 close_dump_file (DFI_jump, print_rtl, insns);
2606 goto exit_rest_of_compilation;
2609 /* Long term, this should probably move before the jump optimizer too,
2610 but I didn't want to disturb the rtl_dump_and_exit and related
2611 stuff at this time. */
2612 if (optimize > 0 && flag_ssa)
2614 /* Convert to SSA form. */
2616 timevar_push (TV_TO_SSA);
2617 open_dump_file (DFI_ssa, decl);
2619 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2620 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2623 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2624 timevar_pop (TV_TO_SSA);
2626 /* Perform sparse conditional constant propagation, if requested. */
2629 timevar_push (TV_SSA_CCP);
2630 open_dump_file (DFI_ssa_ccp, decl);
2634 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2635 timevar_pop (TV_SSA_CCP);
2638 /* It would be useful to cleanup the CFG at this point, but block
2639 merging and possibly other transformations might leave a PHI
2640 node in the middle of a basic block, which is a strict no-no. */
2642 /* The SSA implementation uses basic block numbers in its phi
2643 nodes. Thus, changing the control-flow graph or the basic
2644 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2645 may cause problems. */
2649 /* Remove dead code. */
2651 timevar_push (TV_SSA_DCE);
2652 open_dump_file (DFI_ssa_dce, decl);
2654 insns = get_insns ();
2655 ssa_eliminate_dead_code();
2657 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2658 timevar_pop (TV_SSA_DCE);
2661 /* Convert from SSA form. */
2663 timevar_push (TV_FROM_SSA);
2664 open_dump_file (DFI_ussa, decl);
2666 convert_from_ssa ();
2667 /* New registers have been created. Rescan their usage. */
2668 reg_scan (insns, max_reg_num (), 1);
2670 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2671 timevar_pop (TV_FROM_SSA);
2674 /* CFG is no longer maintained up-to-date. */
2675 free_bb_for_insn ();
2678 timevar_push (TV_JUMP);
2682 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2683 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2685 /* ??? Run if-conversion before delete_null_pointer_checks,
2686 since the later does not preserve the CFG. This should
2687 be changed -- no since converting if's that are going to
2689 timevar_push (TV_IFCVT);
2691 timevar_pop (TV_IFCVT);
2693 /* CFG is no longer maintained up-to-date. */
2694 free_bb_for_insn ();
2695 /* Try to identify useless null pointer tests and delete them. */
2696 if (flag_delete_null_pointer_checks)
2697 delete_null_pointer_checks (insns);
2700 /* Jump optimization, and the removal of NULL pointer checks, may
2701 have reduced the number of instructions substantially. CSE, and
2702 future passes, allocate arrays whose dimensions involve the
2703 maximum instruction UID, so if we can reduce the maximum UID
2704 we'll save big on memory. */
2705 renumber_insns (rtl_dump_file);
2706 timevar_pop (TV_JUMP);
2708 close_dump_file (DFI_jump, print_rtl, insns);
2712 /* Perform common subexpression elimination.
2713 Nonzero value from `cse_main' means that jumps were simplified
2714 and some code may now be unreachable, so do
2715 jump optimization again. */
2719 open_dump_file (DFI_cse, decl);
2720 timevar_push (TV_CSE);
2722 reg_scan (insns, max_reg_num (), 1);
2724 if (flag_thread_jumps)
2726 timevar_push (TV_JUMP);
2727 thread_jumps (insns, max_reg_num (), 1);
2728 timevar_pop (TV_JUMP);
2731 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2733 /* If we are not running more CSE passes, then we are no longer
2734 expecting CSE to be run. But always rerun it in a cheap mode. */
2735 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2737 if (tem || optimize > 1)
2739 timevar_push (TV_JUMP);
2740 rebuild_jump_labels (insns);
2741 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2742 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2743 timevar_pop (TV_JUMP);
2744 /* CFG is no longer maintained up-to-date. */
2745 free_bb_for_insn ();
2748 /* Run this after jump optmizations remove all the unreachable code
2749 so that unreachable code will not keep values live. */
2750 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2752 /* Try to identify useless null pointer tests and delete them. */
2753 if (flag_delete_null_pointer_checks)
2755 timevar_push (TV_JUMP);
2756 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2758 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2760 delete_null_pointer_checks (insns);
2761 /* CFG is no longer maintained up-to-date. */
2762 free_bb_for_insn ();
2763 timevar_pop (TV_JUMP);
2766 /* The second pass of jump optimization is likely to have
2767 removed a bunch more instructions. */
2768 renumber_insns (rtl_dump_file);
2770 timevar_pop (TV_CSE);
2771 close_dump_file (DFI_cse, print_rtl, insns);
2774 open_dump_file (DFI_addressof, decl);
2776 purge_addressof (insns);
2777 reg_scan (insns, max_reg_num (), 1);
2779 close_dump_file (DFI_addressof, print_rtl, insns);
2783 /* Perform global cse. */
2785 if (optimize > 0 && flag_gcse)
2787 int save_csb, save_cfj;
2790 timevar_push (TV_GCSE);
2791 open_dump_file (DFI_gcse, decl);
2793 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2794 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2795 tem = gcse_main (insns, rtl_dump_file);
2797 save_csb = flag_cse_skip_blocks;
2798 save_cfj = flag_cse_follow_jumps;
2799 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2801 /* CFG is no longer maintained up-to-date. */
2802 free_bb_for_insn ();
2803 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2805 if (flag_expensive_optimizations)
2807 timevar_push (TV_CSE);
2808 reg_scan (insns, max_reg_num (), 1);
2809 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2810 timevar_pop (TV_CSE);
2811 cse_not_expected = !flag_rerun_cse_after_loop;
2814 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2815 things up. Then possibly re-run CSE again. */
2819 timevar_push (TV_JUMP);
2820 rebuild_jump_labels (insns);
2821 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2822 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2823 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2824 /* CFG is no longer maintained up-to-date. */
2825 free_bb_for_insn ();
2826 timevar_pop (TV_JUMP);
2828 if (flag_expensive_optimizations)
2830 timevar_push (TV_CSE);
2831 reg_scan (insns, max_reg_num (), 1);
2832 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2833 timevar_pop (TV_CSE);
2837 close_dump_file (DFI_gcse, print_rtl, insns);
2838 timevar_pop (TV_GCSE);
2841 flag_cse_skip_blocks = save_csb;
2842 flag_cse_follow_jumps = save_cfj;
2845 /* Move constant computations out of loops. */
2849 timevar_push (TV_LOOP);
2850 open_dump_file (DFI_loop, decl);
2851 free_bb_for_insn ();
2853 if (flag_rerun_loop_opt)
2855 cleanup_barriers ();
2857 /* We only want to perform unrolling once. */
2859 loop_optimize (insns, rtl_dump_file, 0);
2861 /* The first call to loop_optimize makes some instructions
2862 trivially dead. We delete those instructions now in the
2863 hope that doing so will make the heuristics in loop work
2864 better and possibly speed up compilation. */
2865 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2867 /* The regscan pass is currently necessary as the alias
2868 analysis code depends on this information. */
2869 reg_scan (insns, max_reg_num (), 1);
2871 cleanup_barriers ();
2872 loop_optimize (insns, rtl_dump_file,
2873 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2874 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2876 close_dump_file (DFI_loop, print_rtl, insns);
2877 timevar_pop (TV_LOOP);
2884 timevar_push (TV_CSE2);
2885 open_dump_file (DFI_cse2, decl);
2887 if (flag_rerun_cse_after_loop)
2889 /* Running another jump optimization pass before the second
2890 cse pass sometimes simplifies the RTL enough to allow
2891 the second CSE pass to do a better job. Jump_optimize can change
2892 max_reg_num so we must rerun reg_scan afterwards.
2893 ??? Rework to not call reg_scan so often. */
2894 timevar_push (TV_JUMP);
2896 /* The previous call to loop_optimize makes some instructions
2897 trivially dead. We delete those instructions now in the
2898 hope that doing so will make the heuristics in jump work
2899 better and possibly speed up compilation. */
2900 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2902 reg_scan (insns, max_reg_num (), 0);
2904 timevar_push (TV_IFCVT);
2906 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2907 cleanup_cfg (CLEANUP_EXPENSIVE);
2910 timevar_pop(TV_IFCVT);
2912 timevar_pop (TV_JUMP);
2914 /* CFG is no longer maintained up-to-date. */
2915 free_bb_for_insn ();
2916 reg_scan (insns, max_reg_num (), 0);
2917 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2921 timevar_push (TV_JUMP);
2922 rebuild_jump_labels (insns);
2923 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2924 cleanup_cfg (CLEANUP_EXPENSIVE);
2925 /* CFG is no longer maintained up-to-date. */
2926 free_bb_for_insn ();
2927 timevar_pop (TV_JUMP);
2931 if (flag_thread_jumps)
2933 /* This pass of jump threading straightens out code
2934 that was kinked by loop optimization. */
2935 timevar_push (TV_JUMP);
2936 reg_scan (insns, max_reg_num (), 0);
2937 thread_jumps (insns, max_reg_num (), 0);
2938 timevar_pop (TV_JUMP);
2941 close_dump_file (DFI_cse2, print_rtl, insns);
2942 timevar_pop (TV_CSE2);
2947 cse_not_expected = 1;
2951 /* Do control and data flow analysis; wrote some of the results to
2954 timevar_push (TV_FLOW);
2955 open_dump_file (DFI_cfg, decl);
2957 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2958 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
2959 check_function_return_warnings ();
2961 /* It may make more sense to mark constant functions after dead code is
2962 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2963 may insert code making function non-constant, but we still must consider
2964 it as constant, otherwise -fbranch-probabilities will not read data back.
2966 life_analyzis rarely eliminates modification of external memory.
2968 mark_constant_function ();
2970 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2972 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2974 timevar_push (TV_BRANCH_PROB);
2975 open_dump_file (DFI_bp, decl);
2979 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2980 timevar_pop (TV_BRANCH_PROB);
2983 open_dump_file (DFI_life, decl);
2988 /* Discover and record the loop depth at the head of each basic
2989 block. The loop infrastructure does the real job for us. */
2990 flow_loops_find (&loops, LOOP_TREE);
2992 /* Estimate using heuristics if no profiling info is available. */
2993 if (flag_guess_branch_prob)
2994 estimate_probability (&loops);
2997 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2999 flow_loops_free (&loops);
3001 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3002 timevar_pop (TV_FLOW);
3006 if (warn_uninitialized || extra_warnings)
3008 uninitialized_vars_warning (DECL_INITIAL (decl));
3010 setjmp_args_warning ();
3015 if (initialize_uninitialized_subregs ())
3017 /* Insns were inserted, so things might look a bit different. */
3018 insns = get_insns();
3019 life_analysis (insns, rtl_dump_file,
3020 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES));
3024 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3028 /* If -opt, try combining insns through substitution. */
3032 int rebuild_jump_labels_after_combine = 0;
3034 timevar_push (TV_COMBINE);
3035 open_dump_file (DFI_combine, decl);
3037 rebuild_jump_labels_after_combine
3038 = combine_instructions (insns, max_reg_num ());
3040 /* Always purge dead edges, as we may eliminate an insn throwing
3042 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true);
3044 /* Combining insns may have turned an indirect jump into a
3045 direct jump. Rebuid the JUMP_LABEL fields of jumping
3047 if (rebuild_jump_labels_after_combine)
3049 timevar_push (TV_JUMP);
3050 rebuild_jump_labels (insns);
3051 timevar_pop (TV_JUMP);
3053 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3056 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3057 timevar_pop (TV_COMBINE);
3062 /* Rerun if-conversion, as combine may have simplified things enough to
3063 now meet sequence length restrictions. */
3066 timevar_push (TV_IFCVT);
3067 open_dump_file (DFI_ce, decl);
3073 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3074 timevar_pop (TV_IFCVT);
3077 /* Register allocation pre-pass, to reduce number of moves
3078 necessary for two-address machines. */
3079 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3081 timevar_push (TV_REGMOVE);
3082 open_dump_file (DFI_regmove, decl);
3084 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3086 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3087 timevar_pop (TV_REGMOVE);
3092 /* Do unconditional splitting before register allocation to allow machine
3093 description to add extra information not needed previously. */
3094 split_all_insns (1);
3096 /* Any of the several passes since flow1 will have munged register
3097 lifetime data a bit. */
3098 register_life_up_to_date = 0;
3100 #ifdef OPTIMIZE_MODE_SWITCHING
3101 timevar_push (TV_MODE_SWITCH);
3104 if (optimize_mode_switching (NULL))
3106 /* We did work, and so had to regenerate global life information.
3107 Take advantage of this and don't re-recompute register life
3108 information below. */
3109 register_life_up_to_date = 1;
3113 timevar_pop (TV_MODE_SWITCH);
3116 timevar_push (TV_SCHED);
3118 #ifdef INSN_SCHEDULING
3120 /* Print function header into sched dump now
3121 because doing the sched analysis makes some of the dump. */
3122 if (optimize > 0 && flag_schedule_insns)
3124 open_dump_file (DFI_sched, decl);
3126 /* Do control and data sched analysis,
3127 and write some of the results to dump file. */
3129 schedule_insns (rtl_dump_file);
3131 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3133 /* Register lifetime information was updated as part of verifying
3135 register_life_up_to_date = 1;
3138 timevar_pop (TV_SCHED);
3142 /* Determine if the current function is a leaf before running reload
3143 since this can impact optimizations done by the prologue and
3144 epilogue thus changing register elimination offsets. */
3145 current_function_is_leaf = leaf_function_p ();
3147 timevar_push (TV_LOCAL_ALLOC);
3148 open_dump_file (DFI_lreg, decl);
3150 /* Allocate pseudo-regs that are used only within 1 basic block.
3152 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3153 jump optimizer after register allocation and reloading are finished. */
3155 if (! register_life_up_to_date)
3156 recompute_reg_usage (insns, ! optimize_size);
3158 /* Allocate the reg_renumber array. */
3159 allocate_reg_info (max_regno, FALSE, TRUE);
3161 /* And the reg_equiv_memory_loc array. */
3162 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3164 allocate_initial_values (reg_equiv_memory_loc);
3166 regclass (insns, max_reg_num (), rtl_dump_file);
3167 rebuild_label_notes_after_reload = local_alloc ();
3169 timevar_pop (TV_LOCAL_ALLOC);
3171 if (dump_file[DFI_lreg].enabled)
3173 timevar_push (TV_DUMP);
3175 dump_flow_info (rtl_dump_file);
3176 dump_local_alloc (rtl_dump_file);
3178 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3179 timevar_pop (TV_DUMP);
3184 timevar_push (TV_GLOBAL_ALLOC);
3185 open_dump_file (DFI_greg, decl);
3187 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3188 pass fixing up any insns that are invalid. */
3191 failure = global_alloc (rtl_dump_file);
3194 build_insn_chain (insns);
3195 failure = reload (insns, 0);
3198 timevar_pop (TV_GLOBAL_ALLOC);
3200 if (dump_file[DFI_greg].enabled)
3202 timevar_push (TV_DUMP);
3204 dump_global_regs (rtl_dump_file);
3206 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3207 timevar_pop (TV_DUMP);
3211 goto exit_rest_of_compilation;
3215 open_dump_file (DFI_postreload, decl);
3217 /* Do a very simple CSE pass over just the hard registers. */
3220 timevar_push (TV_RELOAD_CSE_REGS);
3221 reload_cse_regs (insns);
3222 timevar_pop (TV_RELOAD_CSE_REGS);
3225 /* Register allocation and reloading may have turned an indirect jump into
3226 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3227 jumping instructions. */
3228 if (rebuild_label_notes_after_reload)
3230 timevar_push (TV_JUMP);
3232 rebuild_jump_labels (insns);
3234 timevar_pop (TV_JUMP);
3237 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3239 /* Re-create the death notes which were deleted during reload. */
3240 timevar_push (TV_FLOW2);
3241 open_dump_file (DFI_flow2, decl);
3243 #ifdef ENABLE_CHECKING
3244 verify_flow_info ();
3247 /* If optimizing, then go ahead and split insns now. */
3249 split_all_insns (0);
3251 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3253 /* On some machines, the prologue and epilogue code, or parts thereof,
3254 can be represented as RTL. Doing so lets us schedule insns between
3255 it and the rest of the code and also allows delayed branch
3256 scheduling to operate in the epilogue. */
3257 thread_prologue_and_epilogue_insns (insns);
3261 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP);
3262 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3264 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3265 even for machines with possibly nonzero RETURN_POPS_ARGS
3266 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3267 push instructions will have popping returns. */
3268 #ifndef PUSH_ROUNDING
3269 if (!ACCUMULATE_OUTGOING_ARGS)
3271 combine_stack_adjustments ();
3276 flow2_completed = 1;
3278 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3279 timevar_pop (TV_FLOW2);
3281 #ifdef HAVE_peephole2
3282 if (optimize > 0 && flag_peephole2)
3284 timevar_push (TV_PEEPHOLE2);
3285 open_dump_file (DFI_peephole2, decl);
3287 peephole2_optimize (rtl_dump_file);
3289 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3290 timevar_pop (TV_PEEPHOLE2);
3294 if (flag_rename_registers || flag_cprop_registers)
3296 timevar_push (TV_RENAME_REGISTERS);
3297 open_dump_file (DFI_rnreg, decl);
3299 if (flag_rename_registers)
3300 regrename_optimize ();
3301 if (flag_cprop_registers)
3302 copyprop_hardreg_forward ();
3304 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3305 timevar_pop (TV_RENAME_REGISTERS);
3310 timevar_push (TV_IFCVT2);
3311 open_dump_file (DFI_ce2, decl);
3315 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3316 timevar_pop (TV_IFCVT2);
3320 split_all_insns (1);
3323 #ifdef INSN_SCHEDULING
3324 if (optimize > 0 && flag_schedule_insns_after_reload)
3326 timevar_push (TV_SCHED2);
3327 open_dump_file (DFI_sched2, decl);
3329 /* Do control and data sched analysis again,
3330 and write some more of the results to dump file. */
3332 split_all_insns (1);
3334 schedule_insns (rtl_dump_file);
3336 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3337 timevar_pop (TV_SCHED2);
3343 #ifdef LEAF_REGISTERS
3344 current_function_uses_only_leaf_regs
3345 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3349 timevar_push (TV_REG_STACK);
3350 open_dump_file (DFI_stack, decl);
3352 reg_to_stack (insns, rtl_dump_file);
3354 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3355 timevar_pop (TV_REG_STACK);
3361 timevar_push (TV_REORDER_BLOCKS);
3362 open_dump_file (DFI_bbro, decl);
3364 /* Last attempt to optimize CFG, as life analyzis possibly removed
3365 some instructions. */
3366 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3367 | CLEANUP_CROSSJUMP);
3368 if (flag_reorder_blocks)
3370 reorder_basic_blocks ();
3371 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3374 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3375 timevar_pop (TV_REORDER_BLOCKS);
3377 compute_alignments ();
3379 /* CFG is no longer maintained up-to-date. */
3380 free_bb_for_insn ();
3382 /* If a machine dependent reorganization is needed, call it. */
3383 #ifdef MACHINE_DEPENDENT_REORG
3384 timevar_push (TV_MACH_DEP);
3385 open_dump_file (DFI_mach, decl);
3387 MACHINE_DEPENDENT_REORG (insns);
3389 close_dump_file (DFI_mach, print_rtl, insns);
3390 timevar_pop (TV_MACH_DEP);
3395 purge_line_number_notes (insns);
3396 cleanup_barriers ();
3398 /* If a scheduling pass for delayed branches is to be done,
3399 call the scheduling code. */
3402 if (optimize > 0 && flag_delayed_branch)
3404 timevar_push (TV_DBR_SCHED);
3405 open_dump_file (DFI_dbr, decl);
3407 dbr_schedule (insns, rtl_dump_file);
3409 close_dump_file (DFI_dbr, print_rtl, insns);
3410 timevar_pop (TV_DBR_SCHED);
3416 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3417 timevar_push (TV_SHORTEN_BRANCH);
3418 split_all_insns_noflow ();
3419 timevar_pop (TV_SHORTEN_BRANCH);
3422 convert_to_eh_region_ranges ();
3424 /* Shorten branches. */
3425 timevar_push (TV_SHORTEN_BRANCH);
3426 shorten_branches (get_insns ());
3427 timevar_pop (TV_SHORTEN_BRANCH);
3429 current_function_nothrow = nothrow_function_p ();
3430 if (current_function_nothrow)
3431 /* Now we know that this can't throw; set the flag for the benefit
3432 of other functions later in this translation unit. */
3433 TREE_NOTHROW (current_function_decl) = 1;
3435 /* Now turn the rtl into assembler code. */
3437 timevar_push (TV_FINAL);
3442 /* Get the function's name, as described by its RTL. This may be
3443 different from the DECL_NAME name used in the source file. */
3445 x = DECL_RTL (decl);
3446 if (GET_CODE (x) != MEM)
3449 if (GET_CODE (x) != SYMBOL_REF)
3451 fnname = XSTR (x, 0);
3453 assemble_start_function (decl, fnname);
3454 final_start_function (insns, asm_out_file, optimize);
3455 final (insns, asm_out_file, optimize, 0);
3456 final_end_function ();
3458 #ifdef IA64_UNWIND_INFO
3459 /* ??? The IA-64 ".handlerdata" directive must be issued before
3460 the ".endp" directive that closes the procedure descriptor. */
3461 output_function_exception_table ();
3464 assemble_end_function (decl, fnname);
3466 #ifndef IA64_UNWIND_INFO
3467 /* Otherwise, it feels unclean to switch sections in the middle. */
3468 output_function_exception_table ();
3472 fflush (asm_out_file);
3474 /* Release all memory allocated by flow. */
3475 free_basic_block_vars (0);
3477 /* Release all memory held by regsets now. */
3478 regset_release_memory ();
3480 timevar_pop (TV_FINAL);
3484 /* Write DBX symbols if requested. */
3486 /* Note that for those inline functions where we don't initially
3487 know for certain that we will be generating an out-of-line copy,
3488 the first invocation of this routine (rest_of_compilation) will
3489 skip over this code by doing a `goto exit_rest_of_compilation;'.
3490 Later on, finish_compilation will call rest_of_compilation again
3491 for those inline functions that need to have out-of-line copies
3492 generated. During that call, we *will* be routed past here. */
3494 timevar_push (TV_SYMOUT);
3495 (*debug_hooks->function_decl) (decl);
3496 timevar_pop (TV_SYMOUT);
3498 exit_rest_of_compilation:
3500 /* In case the function was not output,
3501 don't leave any temporary anonymous types
3502 queued up for sdb output. */
3503 #ifdef SDB_DEBUGGING_INFO
3504 if (write_symbols == SDB_DEBUG)
3505 sdbout_types (NULL_TREE);
3508 reload_completed = 0;
3509 flow2_completed = 0;
3512 timevar_push (TV_FINAL);
3514 /* Clear out the insn_length contents now that they are no
3516 init_insn_lengths ();
3518 /* Clear out the real_constant_chain before some of the rtx's
3519 it runs through become garbage. */
3520 clear_const_double_mem ();
3522 /* Show no temporary slots allocated. */
3525 free_basic_block_vars (0);
3526 free_bb_for_insn ();
3528 timevar_pop (TV_FINAL);
3530 /* Make sure volatile mem refs aren't considered valid operands for
3531 arithmetic insns. We must call this here if this is a nested inline
3532 function, since the above code leaves us in the init_recog state
3533 (from final.c), and the function context push/pop code does not
3534 save/restore volatile_ok.
3536 ??? Maybe it isn't necessary for expand_start_function to call this
3537 anymore if we do it here? */
3539 init_recog_no_volatile ();
3541 /* We're done with this function. Free up memory if we can. */
3542 free_after_parsing (cfun);
3543 if (! DECL_DEFER_OUTPUT (decl))
3545 free_after_compilation (cfun);
3547 /* Clear integrate.c's pointer to the cfun structure we just
3549 DECL_SAVED_INSNS (decl) = 0;
3555 timevar_pop (TV_REST_OF_COMPILATION);
3565 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3566 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3567 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3568 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3569 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3570 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"));
3572 for (i = ARRAY_SIZE (f_options); i--;)
3574 const char *description = f_options[i].description;
3576 if (description != NULL && * description != 0)
3577 printf (" -f%-21s %s\n",
3578 f_options[i].string, _(description));
3581 printf (_(" -O[number] Set optimization level to [number]\n"));
3582 printf (_(" -Os Optimize for space rather than speed\n"));
3583 for (i = LAST_PARAM; i--;)
3585 const char *description = compiler_params[i].help;
3586 const int length = 21-strlen(compiler_params[i].option);
3588 if (description != NULL && * description != 0)
3589 printf (" --param %s=<value>%.*s%s\n",
3590 compiler_params[i].option,
3591 length > 0 ? length : 1, " ",
3594 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3595 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3596 printf (_(" -w Suppress warnings\n"));
3597 printf (_(" -W Enable extra warnings\n"));
3599 for (i = ARRAY_SIZE (W_options); i--;)
3601 const char *description = W_options[i].description;
3603 if (description != NULL && * description != 0)
3604 printf (" -W%-21s %s\n",
3605 W_options[i].string, _(description));
3608 printf (_(" -Wunused Enable unused warnings\n"));
3609 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3610 printf (_(" -p Enable function profiling\n"));
3611 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3612 printf (_(" -a Enable block profiling \n"));
3614 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3615 printf (_(" -ax Enable jump profiling \n"));
3617 printf (_(" -o <file> Place output into <file> \n"));
3619 -G <number> Put global and static data smaller than <number>\n\
3620 bytes into a special section (on some targets)\n"));
3622 for (i = ARRAY_SIZE (debug_args); i--;)
3624 if (debug_args[i].description != NULL)
3625 printf (" -g%-21s %s\n",
3626 debug_args[i].arg, _(debug_args[i].description));
3629 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3630 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3631 printf (_(" -version Display the compiler's version\n"));
3632 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3633 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3634 #if defined INSN_SCHEDULING
3635 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3637 printf (_(" --help Display this information\n"));
3642 /* Display descriptions of language specific options.
3643 If there is no description, note that there is an undocumented option.
3644 If the description is empty, do not display anything. (This allows
3645 options to be deliberately undocumented, for whatever reason).
3646 If the option string is missing, then this is a marker, indicating
3647 that the description string is in fact the name of a language, whose
3648 language specific options are to follow. */
3650 if (ARRAY_SIZE (documented_lang_options) > 1)
3652 printf (_("\nLanguage specific options:\n"));
3654 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3656 const char *description = documented_lang_options[i].description;
3657 const char *option = documented_lang_options[i].option;
3659 if (description == NULL)
3664 printf (_(" %-23.23s [undocumented]\n"), option);
3666 else if (*description == 0)
3668 else if (option == NULL)
3672 (_("\nThere are undocumented %s specific options as well.\n"),
3676 printf (_("\n Options for %s:\n"), description);
3681 printf (" %-23.23s %s\n", option, _(description));
3686 printf (_("\nThere are undocumented %s specific options as well.\n"),
3689 display_target_options ();
3693 display_target_options ()
3696 static bool displayed = false;
3698 /* Avoid double printing for --help --target-help. */
3703 if (ARRAY_SIZE (target_switches) > 1
3704 #ifdef TARGET_OPTIONS
3705 || ARRAY_SIZE (target_options) > 1
3713 printf (_("\nTarget specific options:\n"));
3715 for (i = ARRAY_SIZE (target_switches); i--;)
3717 const char *option = target_switches[i].name;
3718 const char *description = target_switches[i].description;
3720 if (option == NULL || *option == 0)
3722 else if (description == NULL)
3727 printf (_(" -m%-23.23s [undocumented]\n"), option);
3729 else if (* description != 0)
3730 doc += printf (" -m%-23.23s %s\n", option, _(description));
3733 #ifdef TARGET_OPTIONS
3734 for (i = ARRAY_SIZE (target_options); i--;)
3736 const char *option = target_options[i].prefix;
3737 const char *description = target_options[i].description;
3739 if (option == NULL || *option == 0)
3741 else if (description == NULL)
3746 printf (_(" -m%-23.23s [undocumented]\n"), option);
3748 else if (* description != 0)
3749 doc += printf (" -m%-23.23s %s\n", option, _(description));
3755 printf (_("\nThere are undocumented target specific options as well.\n"));
3757 printf (_(" They exist, but they are not documented.\n"));
3762 /* Parse a -d... command line switch. */
3765 decode_d_option (arg)
3774 for (i = 0; i < (int) DFI_MAX; ++i)
3775 dump_file[i].enabled = 1;
3781 flag_print_asm_name = 1;
3784 flag_dump_rtl_in_asm = 1;
3785 flag_print_asm_name = 1;
3788 graph_dump_format = vcg;
3791 rtl_dump_and_exit = 1;
3794 (*lang_hooks.set_yydebug) (1);
3796 case 'D': /* These are handled by the preprocessor. */
3802 for (i = 0; i < (int) DFI_MAX; ++i)
3803 if (c == dump_file[i].debug_switch)
3805 dump_file[i].enabled = 1;
3810 warning ("unrecognized gcc debugging option: %c", c);
3815 /* Parse a -f... command line switch. ARG is the value after the -f.
3816 It is safe to access 'ARG - 2' to generate the full switch name.
3817 Return the number of strings consumed. */
3820 decode_f_option (arg)
3824 const char *option_value = NULL;
3826 /* Search for the option in the table of binary f options. */
3827 for (j = ARRAY_SIZE (f_options); j--;)
3829 if (!strcmp (arg, f_options[j].string))
3831 *f_options[j].variable = f_options[j].on_value;
3835 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3836 && ! strcmp (arg + 3, f_options[j].string))
3838 *f_options[j].variable = ! f_options[j].on_value;
3843 if (!strcmp (arg, "fast-math"))
3844 set_fast_math_flags();
3845 else if (!strcmp (arg, "no-fast-math"))
3846 set_no_fast_math_flags();
3847 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3848 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3851 read_integral_parameter (option_value, arg - 2,
3853 set_param_value ("max-inline-insns", val);
3855 #ifdef INSN_SCHEDULING
3856 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3857 fix_sched_param ("verbose", option_value);
3859 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3860 fix_register (option_value, 1, 1);
3861 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3862 fix_register (option_value, 0, 1);
3863 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3864 fix_register (option_value, 0, 0);
3865 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3866 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3867 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3869 = read_integral_parameter (option_value, arg - 2, align_functions);
3870 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3871 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3872 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3874 = read_integral_parameter (option_value, arg - 2, align_labels);
3875 else if ((option_value
3876 = skip_leading_substring (arg, "stack-limit-register=")))
3878 int reg = decode_reg_name (option_value);
3880 error ("unrecognized register name `%s'", option_value);
3882 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3884 else if ((option_value
3885 = skip_leading_substring (arg, "stack-limit-symbol=")))
3888 nm = ggc_strdup (option_value);
3889 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3891 else if ((option_value
3892 = skip_leading_substring (arg, "message-length=")))
3893 output_set_maximum_length
3894 (&global_dc->buffer, read_integral_parameter
3895 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3896 else if ((option_value
3897 = skip_leading_substring (arg, "diagnostics-show-location=")))
3899 if (!strcmp (option_value, "once"))
3900 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3901 else if (!strcmp (option_value, "every-line"))
3902 diagnostic_prefixing_rule (global_dc)
3903 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3905 error ("unrecognized option `%s'", arg - 2);
3907 else if (!strcmp (arg, "no-stack-limit"))
3908 stack_limit_rtx = NULL_RTX;
3909 else if (!strcmp (arg, "preprocessed"))
3910 /* Recognise this switch but do nothing. This prevents warnings
3911 about an unrecognized switch if cpplib has not been linked in. */
3919 /* Parse a -W... command line switch. ARG is the value after the -W.
3920 It is safe to access 'ARG - 2' to generate the full switch name.
3921 Return the number of strings consumed. */
3924 decode_W_option (arg)
3927 const char *option_value = NULL;
3930 /* Search for the option in the table of binary W options. */
3932 for (j = ARRAY_SIZE (W_options); j--;)
3934 if (!strcmp (arg, W_options[j].string))
3936 *W_options[j].variable = W_options[j].on_value;
3940 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3941 && ! strcmp (arg + 3, W_options[j].string))
3943 *W_options[j].variable = ! W_options[j].on_value;
3948 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3949 warning ("-Wid-clash-LEN is no longer supported");
3950 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3952 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3954 warn_larger_than = larger_than_size != -1;
3956 else if (!strcmp (arg, "unused"))
3960 else if (!strcmp (arg, "no-unused"))
3970 /* Parse a -g... command line switch. ARG is the value after the -g.
3971 It is safe to access 'ARG - 2' to generate the full switch name.
3972 Return the number of strings consumed. */
3975 decode_g_option (arg)
3978 static unsigned level=0;
3979 /* A lot of code assumes write_symbols == NO_DEBUG if the
3980 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3981 of what debugging type has been selected). This records the
3982 selected type. It is an error to specify more than one
3984 static enum debug_info_type selected_debug_type = NO_DEBUG;
3985 /* Non-zero if debugging format has been explicitly set.
3986 -g and -ggdb don't explicitly set the debugging format so
3987 -gdwarf -g3 is equivalent to -gdwarf3. */
3988 static int type_explicitly_set_p = 0;
3989 /* Indexed by enum debug_info_type. */
3990 static const char *const debug_type_names[] =
3992 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3995 /* The maximum admissible debug level value. */
3996 static const unsigned max_debug_level = 3;
3998 /* Look up ARG in the table. */
3999 for (da = debug_args; da->arg; da++)
4001 const int da_len = strlen (da->arg);
4003 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4005 enum debug_info_type type = da->debug_type;
4006 const char *p = arg + da_len;
4008 if (*p && ! ISDIGIT (*p))
4011 /* A debug flag without a level defaults to level 2.
4012 Note we do not want to call read_integral_parameter
4013 for that case since it will call atoi which
4016 ??? We may want to generalize the interface to
4017 read_integral_parameter to better handle this case
4018 if this case shows up often. */
4020 level = read_integral_parameter (p, 0, max_debug_level + 1);
4022 level = (level == 0) ? 2 : level;
4024 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4026 error ("use -gdwarf -g%d for DWARF v1, level %d",
4029 error ("use -gdwarf-2 for DWARF v2");
4032 if (level > max_debug_level)
4035 ignoring option `%s' due to invalid debug level specification",
4037 level = debug_info_level;
4040 if (type == NO_DEBUG)
4042 type = PREFERRED_DEBUGGING_TYPE;
4044 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4046 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4047 type = DWARF2_DEBUG;
4049 #ifdef DBX_DEBUGGING_INFO
4056 if (type == NO_DEBUG)
4057 warning ("`%s': unknown or unsupported -g option", arg - 2);
4059 /* Does it conflict with an already selected type? */
4060 if (type_explicitly_set_p
4061 /* -g/-ggdb don't conflict with anything. */
4062 && da->debug_type != NO_DEBUG
4063 && type != selected_debug_type)
4064 warning ("`%s' ignored, conflicts with `-g%s'",
4065 arg - 2, debug_type_names[(int) selected_debug_type]);
4068 /* If the format has already been set, -g/-ggdb
4069 only change the debug level. */
4070 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4071 /* Don't change debugging type. */
4075 selected_debug_type = type;
4076 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4079 write_symbols = (level == 0
4081 : selected_debug_type);
4082 use_gnu_debug_info_extensions = da->use_extensions_p;
4083 debug_info_level = (enum debug_info_level) level;
4096 /* Decode the first argument in the argv as a language-independent option.
4097 Return the number of strings consumed. */
4100 independent_decode_option (argc, argv)
4104 char *arg = argv[0];
4106 if (arg[0] != '-' || arg[1] == 0)
4118 if (!strcmp (arg, "-help"))
4121 exit_after_options = 1;
4124 if (!strcmp (arg, "-target-help"))
4126 display_target_options ();
4127 exit_after_options = 1;
4130 if (!strcmp (arg, "-version"))
4132 print_version (stderr, "");
4133 exit_after_options = 1;
4136 /* Handle '--param <name>=<value>'. */
4137 if (strcmp (arg, "-param") == 0)
4143 error ("-param option missing argument");
4147 /* Get the '<name>=<value>' parameter. */
4149 /* Look for the `='. */
4150 equal = strchr (arg, '=');
4152 error ("invalid --param option: %s", arg);
4157 /* Zero out the `=' sign so that we get two separate strings. */
4159 /* Figure out what value is specified. */
4160 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4161 if (val != INVALID_PARAM_VAL)
4162 set_param_value (arg, val);
4164 error ("invalid parameter value `%s'", equal + 1);
4179 /* Already been treated in main (). Do nothing. */
4183 set_target_switch (arg + 1);
4187 return decode_f_option (arg + 1);
4190 return decode_g_option (arg + 1);
4193 if (!strcmp (arg, "dumpbase"))
4198 dump_base_name = argv[1];
4202 decode_d_option (arg + 1);
4206 if (!strcmp (arg, "pedantic"))
4208 else if (!strcmp (arg, "pedantic-errors"))
4209 flag_pedantic_errors = pedantic = 1;
4210 else if (arg[1] == 0)
4217 if (!strcmp (arg, "quiet"))
4224 if (!strcmp (arg, "version"))
4232 inhibit_warnings = 1;
4241 /* We save the value of warn_uninitialized, since if they put
4242 -Wuninitialized on the command line, we need to generate a
4243 warning about not using it without also specifying -O. */
4244 if (warn_uninitialized != 1)
4245 warn_uninitialized = 2;
4248 return decode_W_option (arg + 1);
4257 asm_file_name = argv[1];
4272 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4277 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4281 if (g_switch_val == -1)
4285 g_switch_set = TRUE;
4286 g_switch_value = g_switch_val;
4296 /* Decode -m switches. */
4297 /* Decode the switch -mNAME. */
4300 set_target_switch (name)
4304 int valid_target_option = 0;
4306 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4307 if (!strcmp (target_switches[j].name, name))
4309 if (target_switches[j].value < 0)
4310 target_flags &= ~-target_switches[j].value;
4312 target_flags |= target_switches[j].value;
4313 valid_target_option = 1;
4316 #ifdef TARGET_OPTIONS
4317 if (!valid_target_option)
4318 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4320 int len = strlen (target_options[j].prefix);
4321 if (!strncmp (target_options[j].prefix, name, len))
4323 *target_options[j].variable = name + len;
4324 valid_target_option = 1;
4329 if (!valid_target_option)
4330 error ("invalid option `%s'", name);
4333 /* Print version information to FILE.
4334 Each line begins with INDENT (for the case where FILE is the
4335 assembler output file). */
4338 print_version (file, indent)
4343 #define __VERSION__ "[?]"
4347 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4349 "%s%s%s version %s (%s) compiled by CC.\n"
4351 , indent, *indent != 0 ? " " : "",
4352 lang_hooks.name, version_string, TARGET_NAME,
4353 indent, __VERSION__);
4356 /* Print an option value and return the adjusted position in the line.
4357 ??? We don't handle error returns from fprintf (disk full); presumably
4358 other code will catch a disk full though. */
4361 print_single_switch (file, pos, max, indent, sep, term, type, name)
4364 const char *indent, *sep, *term, *type, *name;
4366 /* The ultrix fprintf returns 0 on success, so compute the result we want
4367 here since we need it for the following test. */
4368 int len = strlen (sep) + strlen (type) + strlen (name);
4373 fprintf (file, "%s", term);
4378 fprintf (file, "%s", indent);
4379 pos = strlen (indent);
4381 fprintf (file, "%s%s%s", sep, type, name);
4386 /* Print active target switches to FILE.
4387 POS is the current cursor position and MAX is the size of a "line".
4388 Each line begins with INDENT and ends with TERM.
4389 Each switch is separated from the next by SEP. */
4392 print_switch_values (file, pos, max, indent, sep, term)
4395 const char *indent, *sep, *term;
4400 /* Print the options as passed. */
4402 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4403 _("options passed: "), "");
4405 for (p = &save_argv[1]; *p != NULL; p++)
4409 if (strcmp (*p, "-o") == 0)
4415 if (strcmp (*p, "-quiet") == 0)
4417 if (strcmp (*p, "-version") == 0)
4422 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4425 fprintf (file, "%s", term);
4427 /* Print the -f and -m options that have been enabled.
4428 We don't handle language specific options but printing argv
4431 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4432 _("options enabled: "), "");
4434 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4435 if (*f_options[j].variable == f_options[j].on_value)
4436 pos = print_single_switch (file, pos, max, indent, sep, term,
4437 "-f", f_options[j].string);
4439 /* Print target specific options. */
4441 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4442 if (target_switches[j].name[0] != '\0'
4443 && target_switches[j].value > 0
4444 && ((target_switches[j].value & target_flags)
4445 == target_switches[j].value))
4447 pos = print_single_switch (file, pos, max, indent, sep, term,
4448 "-m", target_switches[j].name);
4451 #ifdef TARGET_OPTIONS
4452 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4453 if (*target_options[j].variable != NULL)
4456 sprintf (prefix, "-m%s", target_options[j].prefix);
4457 pos = print_single_switch (file, pos, max, indent, sep, term,
4458 prefix, *target_options[j].variable);
4462 fprintf (file, "%s", term);
4465 /* Open assembly code output file. Do this even if -fsyntax-only is
4466 on, because then the driver will have provided the name of a
4467 temporary file or bit bucket for us. NAME is the file specified on
4468 the command line, possibly NULL. */
4470 init_asm_output (name)
4473 if (name == NULL && asm_file_name == 0)
4474 asm_out_file = stdout;
4477 if (asm_file_name == 0)
4479 int len = strlen (dump_base_name);
4480 char *dumpname = (char *) xmalloc (len + 6);
4481 memcpy (dumpname, dump_base_name, len + 1);
4482 strip_off_ending (dumpname, len);
4483 strcat (dumpname, ".s");
4484 asm_file_name = dumpname;
4486 if (!strcmp (asm_file_name, "-"))
4487 asm_out_file = stdout;
4489 asm_out_file = fopen (asm_file_name, "w");
4490 if (asm_out_file == 0)
4491 fatal_io_error ("can't open %s for writing", asm_file_name);
4494 #ifdef IO_BUFFER_SIZE
4495 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4496 _IOFBF, IO_BUFFER_SIZE);
4499 if (!flag_syntax_only)
4501 #ifdef ASM_FILE_START
4502 ASM_FILE_START (asm_out_file);
4505 #ifdef ASM_COMMENT_START
4506 if (flag_verbose_asm)
4508 /* Print the list of options in effect. */
4509 print_version (asm_out_file, ASM_COMMENT_START);
4510 print_switch_values (asm_out_file, 0, MAX_LINE,
4511 ASM_COMMENT_START, " ", "\n");
4512 /* Add a blank line here so it appears in assembler output but not
4514 fprintf (asm_out_file, "\n");
4520 /* Initialization of the front end environment, before command line
4521 options are parsed. Signal handlers, internationalization etc.
4522 ARGV0 is main's argv[0]. */
4524 general_init (argv0)
4529 p = argv0 + strlen (argv0);
4530 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4534 xmalloc_set_program_name (progname);
4536 gcc_init_libintl ();
4538 /* Install handler for SIGFPE, which may be received while we do
4539 compile-time floating point arithmetic. */
4540 signal (SIGFPE, float_signal);
4542 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4544 signal (SIGSEGV, crash_signal);
4547 signal (SIGILL, crash_signal);
4550 signal (SIGBUS, crash_signal);
4553 signal (SIGABRT, crash_signal);
4555 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4556 signal (SIGIOT, crash_signal);
4559 /* Initialize the diagnostics reporting machinery, so option parsing
4560 can give warnings and errors. */
4561 diagnostic_initialize (global_dc);
4564 /* Parse command line options and set default flag values, called
4565 after language-independent option-independent initialization. Do
4566 minimal options processing. Outputting diagnostics is OK, but GC
4567 and identifier hashtables etc. are not initialized yet. */
4569 parse_options_and_default_flags (argc, argv)
4575 /* Save in case md file wants to emit args as a comment. */
4579 /* Initialize register usage now so switches may override. */
4582 /* Register the language-independent parameters. */
4583 add_params (lang_independent_params, LAST_PARAM);
4585 /* Perform language-specific options initialization. */
4586 (*lang_hooks.init_options) ();
4588 /* Scan to see what optimization level has been specified. That will
4589 determine the default value of many flags. */
4590 for (i = 1; i < argc; i++)
4592 if (!strcmp (argv[i], "-O"))
4597 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4599 /* Handle -Os, -O2, -O3, -O69, ... */
4600 char *p = &argv[i][2];
4602 if ((p[0] == 's') && (p[1] == 0))
4606 /* Optimizing for size forces optimize to be 2. */
4611 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4612 if (optimize_val != -1)
4614 optimize = optimize_val;
4623 flag_merge_constants = 0;
4629 flag_thread_jumps = 1;
4631 flag_delayed_branch = 1;
4633 #ifdef CAN_DEBUG_WITHOUT_FP
4634 flag_omit_frame_pointer = 1;
4636 flag_guess_branch_prob = 1;
4637 flag_cprop_registers = 1;
4642 flag_optimize_sibling_calls = 1;
4643 flag_cse_follow_jumps = 1;
4644 flag_cse_skip_blocks = 1;
4646 flag_expensive_optimizations = 1;
4647 flag_strength_reduce = 1;
4648 flag_rerun_cse_after_loop = 1;
4649 flag_rerun_loop_opt = 1;
4650 flag_caller_saves = 1;
4653 #ifdef INSN_SCHEDULING
4654 flag_schedule_insns = 1;
4655 flag_schedule_insns_after_reload = 1;
4658 flag_strict_aliasing = 1;
4659 flag_delete_null_pointer_checks = 1;
4660 flag_reorder_blocks = 1;
4665 flag_inline_functions = 1;
4666 flag_rename_registers = 1;
4669 if (optimize < 2 || optimize_size)
4674 align_functions = 1;
4677 /* Initialize whether `char' is signed. */
4678 flag_signed_char = DEFAULT_SIGNED_CHAR;
4679 #ifdef DEFAULT_SHORT_ENUMS
4680 /* Initialize how much space enums occupy, by default. */
4681 flag_short_enums = DEFAULT_SHORT_ENUMS;
4684 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4687 set_target_switch ("");
4689 /* Unwind tables are always present in an ABI-conformant IA-64
4690 object file, so the default should be ON. */
4691 #ifdef IA64_UNWIND_INFO
4692 flag_unwind_tables = IA64_UNWIND_INFO;
4695 #ifdef OPTIMIZATION_OPTIONS
4696 /* Allow default optimizations to be specified on a per-machine basis. */
4697 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4700 /* Perform normal command line switch decoding. */
4701 for (i = 1; i < argc;)
4704 int indep_processed;
4706 /* Give the language a chance to decode the option for itself. */
4707 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4709 if (lang_processed >= 0)
4710 /* Now see if the option also has a language independent meaning.
4711 Some options are both language specific and language independent,
4713 indep_processed = independent_decode_option (argc - i, argv + i);
4716 lang_processed = -lang_processed;
4717 indep_processed = 0;
4720 if (lang_processed || indep_processed)
4721 i += MAX (lang_processed, indep_processed);
4724 const char *option = NULL;
4725 const char *lang = NULL;
4728 /* It is possible that the command line switch is not valid for the
4729 current language, but it is valid for another language. In order
4730 to be compatible with previous versions of the compiler (which
4731 did not issue an error message in this case) we check for this
4732 possibility here. If we do find a match, then if extra_warnings
4733 is set we generate a warning message, otherwise we will just
4734 ignore the option. */
4735 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4737 option = documented_lang_options[j].option;
4740 lang = documented_lang_options[j].description;
4741 else if (! strncmp (argv[i], option, strlen (option)))
4745 if (j != ARRAY_SIZE (documented_lang_options))
4749 warning ("ignoring command line option '%s'", argv[i]);
4752 ("(it is valid for %s but not the selected language)",
4756 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4757 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4759 error ("unrecognized option `%s'", argv[i]);
4765 /* Set flag_no_inline before the post_options () hook. The C front
4766 ends use it to determine tree inlining defaults. FIXME: such
4767 code should be lang-independent when all front ends use tree
4768 inlining, in which case it, and this condition, should be moved
4769 to the top of process_options() instead. */
4772 /* Inlining does not work if not optimizing,
4773 so force it not to be done. */
4777 /* The c_decode_option function and decode_option hook set
4778 this to `2' if -Wall is used, so we can avoid giving out
4779 lots of errors for people who don't realize what -Wall does. */
4780 if (warn_uninitialized == 1)
4781 warning ("-Wuninitialized is not supported without -O");
4784 /* All command line options have been parsed; allow the front end to
4785 perform consistency checks, etc. */
4786 (*lang_hooks.post_options) ();
4789 /* Process the options that have been parsed. */
4793 #ifdef OVERRIDE_OPTIONS
4794 /* Some machines may reject certain combinations of options. */
4798 /* Set up the align_*_log variables, defaulting them to 1 if they
4799 were still unset. */
4800 if (align_loops <= 0) align_loops = 1;
4801 if (align_loops_max_skip > align_loops || !align_loops)
4802 align_loops_max_skip = align_loops - 1;
4803 align_loops_log = floor_log2 (align_loops * 2 - 1);
4804 if (align_jumps <= 0) align_jumps = 1;
4805 if (align_jumps_max_skip > align_jumps || !align_jumps)
4806 align_jumps_max_skip = align_jumps - 1;
4807 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4808 if (align_labels <= 0) align_labels = 1;
4809 align_labels_log = floor_log2 (align_labels * 2 - 1);
4810 if (align_labels_max_skip > align_labels || !align_labels)
4811 align_labels_max_skip = align_labels - 1;
4812 if (align_functions <= 0) align_functions = 1;
4813 align_functions_log = floor_log2 (align_functions * 2 - 1);
4815 /* Unrolling all loops implies that standard loop unrolling must also
4817 if (flag_unroll_all_loops)
4818 flag_unroll_loops = 1;
4819 /* Loop unrolling requires that strength_reduction be on also. Silently
4820 turn on strength reduction here if it isn't already on. Also, the loop
4821 unrolling code assumes that cse will be run after loop, so that must
4822 be turned on also. */
4823 if (flag_unroll_loops)
4825 flag_strength_reduce = 1;
4826 flag_rerun_cse_after_loop = 1;
4829 if (flag_non_call_exceptions)
4830 flag_asynchronous_unwind_tables = 1;
4831 if (flag_asynchronous_unwind_tables)
4832 flag_unwind_tables = 1;
4834 /* Warn about options that are not supported on this machine. */
4835 #ifndef INSN_SCHEDULING
4836 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4837 warning ("instruction scheduling not supported on this target machine");
4840 if (flag_delayed_branch)
4841 warning ("this target machine does not have delayed branches");
4844 /* Some operating systems do not allow profiling without a frame
4846 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4848 && flag_omit_frame_pointer)
4850 error ("profiling does not work without a frame pointer");
4851 flag_omit_frame_pointer = 0;
4854 user_label_prefix = USER_LABEL_PREFIX;
4855 if (flag_leading_underscore != -1)
4857 /* If the default prefix is more complicated than "" or "_",
4858 issue a warning and ignore this option. */
4859 if (user_label_prefix[0] == 0 ||
4860 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4862 user_label_prefix = flag_leading_underscore ? "_" : "";
4865 warning ("-f%sleading-underscore not supported on this target machine",
4866 flag_leading_underscore ? "" : "no-");
4869 /* If we are in verbose mode, write out the version and maybe all the
4870 option flags in use. */
4873 print_version (stderr, "");
4875 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4881 if (flag_syntax_only)
4883 write_symbols = NO_DEBUG;
4887 /* Now we know write_symbols, set up the debug hooks based on it.
4888 By default we do nothing for debug output. */
4889 #if defined(DBX_DEBUGGING_INFO)
4890 if (write_symbols == DBX_DEBUG)
4891 debug_hooks = &dbx_debug_hooks;
4893 #if defined(XCOFF_DEBUGGING_INFO)
4894 if (write_symbols == XCOFF_DEBUG)
4895 debug_hooks = &xcoff_debug_hooks;
4897 #ifdef SDB_DEBUGGING_INFO
4898 if (write_symbols == SDB_DEBUG)
4899 debug_hooks = &sdb_debug_hooks;
4901 #ifdef DWARF_DEBUGGING_INFO
4902 if (write_symbols == DWARF_DEBUG)
4903 debug_hooks = &dwarf_debug_hooks;
4905 #ifdef DWARF2_DEBUGGING_INFO
4906 if (write_symbols == DWARF2_DEBUG)
4907 debug_hooks = &dwarf2_debug_hooks;
4909 #ifdef VMS_DEBUGGING_INFO
4910 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4911 debug_hooks = &vmsdbg_debug_hooks;
4914 /* If auxiliary info generation is desired, open the output file.
4915 This goes in the same directory as the source file--unlike
4916 all the other output files. */
4917 if (flag_gen_aux_info)
4919 aux_info_file = fopen (aux_info_file_name, "w");
4920 if (aux_info_file == 0)
4921 fatal_io_error ("can't open %s", aux_info_file_name);
4924 if (! targetm.have_named_sections)
4926 if (flag_function_sections)
4928 warning ("-ffunction-sections not supported for this target");
4929 flag_function_sections = 0;
4931 if (flag_data_sections)
4933 warning ("-fdata-sections not supported for this target");
4934 flag_data_sections = 0;
4938 if (flag_function_sections && profile_flag)
4940 warning ("-ffunction-sections disabled; it makes profiling impossible");
4941 flag_function_sections = 0;
4944 #ifndef HAVE_prefetch
4945 if (flag_prefetch_loop_arrays)
4947 warning ("-fprefetch-loop-arrays not supported for this target");
4948 flag_prefetch_loop_arrays = 0;
4951 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4953 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4954 flag_prefetch_loop_arrays = 0;
4958 #ifndef OBJECT_FORMAT_ELF
4959 if (flag_function_sections && write_symbols != NO_DEBUG)
4960 warning ("-ffunction-sections may affect debugging on some targets");
4964 /* Language-independent initialization, before language-dependent
4967 lang_independent_init ()
4969 decl_printable_name = decl_name;
4970 lang_expand_expr = (lang_expand_expr_t) do_abort;
4972 /* Set the language-dependent identifier size. */
4973 tree_code_length[(int) IDENTIFIER_NODE]
4974 = ((lang_hooks.identifier_size - sizeof (struct tree_common))
4977 /* Initialize the garbage-collector, and string pools. */
4979 ggc_add_rtx_root (&stack_limit_rtx, 1);
4980 ggc_add_tree_root (¤t_function_decl, 1);
4981 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4986 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4987 || debug_info_level == DINFO_LEVEL_VERBOSE
4988 #ifdef VMS_DEBUGGING_INFO
4989 /* Enable line number info for traceback */
4990 || debug_info_level > DINFO_LEVEL_NONE
4992 || flag_test_coverage
4993 || warn_notreached);
4999 init_function_once ();
5000 init_stor_layout_once ();
5001 init_varasm_once ();
5002 init_EXPR_INSN_LIST_cache ();
5004 /* The following initialization functions need to generate rtl, so
5005 provide a dummy function context for them. */
5006 init_dummy_function_start ();
5009 if (flag_caller_saves)
5010 init_caller_save ();
5011 expand_dummy_function_end ();
5014 /* Language-dependent initialization. Returns non-zero on success. */
5016 lang_dependent_init (name)
5019 if (dump_base_name == 0)
5020 dump_base_name = name ? name : "gccdump";
5022 /* Front-end initialization. This hook can assume that GC,
5023 identifier hashes etc. are set up, but debug initialization is
5024 not done yet. This routine must return the original filename
5025 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5026 name = (*lang_hooks.init) (name);
5030 /* Is this duplication necessary? */
5031 name = ggc_strdup (name);
5032 main_input_filename = input_filename = name;
5033 init_asm_output (name);
5035 /* These create various _DECL nodes, so need to be called after the
5036 front end is initialized. */
5040 /* Put an entry on the input file stack for the main input file. */
5041 push_srcloc (input_filename, 0);
5043 /* If dbx symbol table desired, initialize writing it and output the
5044 predefined types. */
5045 timevar_push (TV_SYMOUT);
5047 #ifdef DWARF2_UNWIND_INFO
5048 if (dwarf2out_do_frame ())
5049 dwarf2out_frame_init ();
5052 /* Now we have the correct original filename, we can initialize
5054 (*debug_hooks->init) (name);
5056 timevar_pop (TV_SYMOUT);
5061 /* Clean up: close opened files, etc. */
5066 /* Close the dump files. */
5067 if (flag_gen_aux_info)
5069 fclose (aux_info_file);
5071 unlink (aux_info_file_name);
5074 /* Close non-debugging input and output files. Take special care to note
5075 whether fclose returns an error, since the pages might still be on the
5076 buffer chain while the file is open. */
5080 if (ferror (asm_out_file) != 0)
5081 fatal_io_error ("error writing to %s", asm_file_name);
5082 if (fclose (asm_out_file) != 0)
5083 fatal_io_error ("error closing %s", asm_file_name);
5086 /* Do whatever is necessary to finish printing the graphs. */
5087 if (graph_dump_format != no_graph)
5091 for (i = 0; i < (int) DFI_MAX; ++i)
5092 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5097 sprintf (seq, DUMPFILE_FORMAT, i);
5098 suffix = concat (seq, dump_file[i].extension, NULL);
5099 finish_graph_dump_file (dump_base_name, suffix);
5106 ggc_print_statistics ();
5107 stringpool_statistics ();
5108 dump_tree_statistics ();
5111 /* Free up memory for the benefit of leak detectors. */
5114 /* Language-specific end of compilation actions. */
5115 (*lang_hooks.finish) ();
5118 /* Initialize the compiler, and compile the input file. */
5122 /* The bulk of command line switch processing. */
5125 /* We cannot start timing until after options are processed since that
5126 says if we run timers or not. */
5128 timevar_start (TV_TOTAL);
5130 /* Language-independent initialization. Also sets up GC, identifier
5132 lang_independent_init ();
5134 /* Language-dependent initialization. Returns true on success. */
5135 if (lang_dependent_init (filename))
5140 /* Stop timing and print the times. */
5141 timevar_stop (TV_TOTAL);
5142 timevar_print (stderr);
5145 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5146 Decode command args, then call compile_file.
5147 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5148 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5150 It is not safe to call this function more than once. */
5153 toplev_main (argc, argv)
5157 /* Initialization of GCC's environment, and diagnostics. */
5158 general_init (argv [0]);
5160 /* Parse the options and do minimal processing; basically just
5161 enough to default flags appropriately. */
5162 parse_options_and_default_flags (argc, argv);
5164 /* Exit early if we can (e.g. -help). */
5165 if (!exit_after_options)
5168 if (errorcount || sorrycount)
5169 return (FATAL_EXIT_CODE);
5171 return (SUCCESS_EXIT_CODE);