1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
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. */
95 /* Carry information from ASM_DECLARE_OBJECT_NAME
96 to ASM_FINISH_DECLARE_OBJECT. */
98 extern int size_directive_output
;
99 extern tree last_assemble_variable_decl
;
101 static void general_init
PARAMS ((char *));
102 static void parse_options_and_default_flags
PARAMS ((int, char **));
103 static void do_compile
PARAMS ((void));
104 static void process_options
PARAMS ((void));
105 static void lang_independent_init
PARAMS ((void));
106 static int lang_dependent_init
PARAMS ((const char *));
107 static void init_asm_output
PARAMS ((const char *));
108 static void finalize
PARAMS ((void));
110 static void set_target_switch
PARAMS ((const char *));
111 static const char *decl_name
PARAMS ((tree
, int));
113 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
114 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
115 static void set_float_handler
PARAMS ((jmp_buf));
116 static void compile_file
PARAMS ((void));
117 static void display_help
PARAMS ((void));
118 static void display_target_options
PARAMS ((void));
120 static void decode_d_option
PARAMS ((const char *));
121 static int decode_f_option
PARAMS ((const char *));
122 static int decode_W_option
PARAMS ((const char *));
123 static int decode_g_option
PARAMS ((const char *));
124 static unsigned int independent_decode_option
PARAMS ((int, char **));
126 static void print_version
PARAMS ((FILE *, const char *));
127 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
128 const char *, const char *,
129 const char *, const char *));
130 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
131 const char *, const char *));
133 /* Length of line when printing switch values. */
136 /* Name of program invoked, sans directories. */
138 const char *progname
;
140 /* Copy of arguments to toplev_main. */
144 /* Name of current original source file (what was input to cpp).
145 This comes from each #-command in the actual input. */
147 const char *input_filename
;
149 /* Name of top-level original source file (what was input to cpp).
150 This comes from the #-command at the beginning of the actual input.
151 If there isn't any there, then this is the cc1 input file name. */
153 const char *main_input_filename
;
155 /* Current line number in real source file. */
159 /* Nonzero if it is unsafe to create any new pseudo registers. */
162 /* Stack of currently pending input files. */
164 struct file_stack
*input_file_stack
;
166 /* Incremented on each change to input_file_stack. */
167 int input_file_stack_tick
;
169 /* Name to use as base of names for dump output files. */
171 const char *dump_base_name
;
173 /* Format to use to print dumpfile index value */
174 #ifndef DUMPFILE_FORMAT
175 #define DUMPFILE_FORMAT ".%02d."
178 /* Bit flags that specify the machine subtype we are compiling for.
179 Bits are tested using macros TARGET_... defined in the tm.h file
180 and set by `-m...' switches. Must be defined in rtlanal.c. */
182 extern int target_flags
;
184 /* Debug hooks - dependent upon command line options. */
186 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
188 /* Describes a dump file. */
190 struct dump_file_info
192 /* The unique extension to apply, e.g. ".jump". */
193 const char *const extension
;
195 /* The -d<c> character that enables this dump file. */
196 char const debug_switch
;
198 /* True if there is a corresponding graph dump file. */
199 char const graph_dump_p
;
201 /* True if the user selected this dump. */
204 /* True if the files have been initialized (ie truncated). */
208 /* Enumerate the extant dump files. */
248 /* Describes all the dump files. Should be kept in order of the
249 pass and in sync with dump_file_index above.
251 Remaining -d letters:
257 static struct dump_file_info dump_file
[DFI_MAX
] =
259 { "rtl", 'r', 0, 0, 0 },
260 { "sibling", 'i', 0, 0, 0 },
261 { "eh", 'h', 0, 0, 0 },
262 { "jump", 'j', 0, 0, 0 },
263 { "ssa", 'e', 1, 0, 0 },
264 { "ssaccp", 'W', 1, 0, 0 },
265 { "ssadce", 'X', 1, 0, 0 },
266 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
267 { "null", 'u', 0, 0, 0 },
268 { "cse", 's', 0, 0, 0 },
269 { "addressof", 'F', 0, 0, 0 },
270 { "gcse", 'G', 1, 0, 0 },
271 { "loop", 'L', 1, 0, 0 },
272 { "cfg", 'f', 1, 0, 0 },
273 { "bp", 'b', 1, 0, 0 },
274 { "cse2", 't', 1, 0, 0 },
275 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
276 { "combine", 'c', 1, 0, 0 },
277 { "ce", 'C', 1, 0, 0 },
278 { "regmove", 'N', 1, 0, 0 },
279 { "sched", 'S', 1, 0, 0 },
280 { "lreg", 'l', 1, 0, 0 },
281 { "greg", 'g', 1, 0, 0 },
282 { "postreload", 'o', 1, 0, 0 },
283 { "flow2", 'w', 1, 0, 0 },
284 { "peephole2", 'z', 1, 0, 0 },
285 { "rnreg", 'n', 1, 0, 0 },
286 { "ce2", 'E', 1, 0, 0 },
287 { "sched2", 'R', 1, 0, 0 },
288 { "stack", 'k', 1, 0, 0 },
289 { "bbro", 'B', 1, 0, 0 },
290 { "mach", 'M', 1, 0, 0 },
291 { "dbr", 'd', 0, 0, 0 },
294 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
295 static void close_dump_file
PARAMS ((enum dump_file_index
,
296 void (*) (FILE *, rtx
), rtx
));
298 /* Other flags saying which kinds of debugging dump have been requested. */
300 int rtl_dump_and_exit
;
301 int flag_print_asm_name
;
302 static int version_flag
;
303 static char *filename
;
304 enum graph_dump_types graph_dump_format
;
306 /* Name for output file of assembly code, specified with -o. */
310 /* Value of the -G xx switch, and whether it was passed or not. */
314 /* Type(s) of debugging information we are producing (if any).
315 See flags.h for the definitions of the different possible
316 types of debugging information. */
317 enum debug_info_type write_symbols
= NO_DEBUG
;
319 /* Level of debugging information we are producing. See flags.h
320 for the definitions of the different possible levels. */
321 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
323 /* Nonzero means use GNU-only extensions in the generated symbolic
324 debugging information. */
325 /* Currently, this only has an effect when write_symbols is set to
326 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
327 int use_gnu_debug_info_extensions
= 0;
329 /* Nonzero means do optimizations. -O.
330 Particular numeric values stand for particular amounts of optimization;
331 thus, -O2 stores 2 here. However, the optimizations beyond the basic
332 ones are not controlled directly by this variable. Instead, they are
333 controlled by individual `flag_...' variables that are defaulted
334 based on this variable. */
338 /* Nonzero means optimize for size. -Os.
339 The only valid values are zero and non-zero. When optimize_size is
340 non-zero, optimize defaults to 2, but certain individual code
341 bloating optimizations are disabled. */
343 int optimize_size
= 0;
345 /* Nonzero if we should exit after parsing options. */
346 static int exit_after_options
= 0;
348 /* The FUNCTION_DECL for the function currently being compiled,
349 or 0 if between functions. */
350 tree current_function_decl
;
352 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
354 tree current_function_func_begin_label
;
356 /* Pointer to function to compute the name to use to print a declaration.
357 DECL is the declaration in question.
358 VERBOSITY determines what information will be printed:
359 0: DECL_NAME, demangled as necessary.
360 1: and scope information.
361 2: and any other information that might be interesting, such as function
362 parameter types in C++. */
364 const char *(*decl_printable_name
) PARAMS ((tree
, int));
366 /* Pointer to function to compute rtl for a language-specific tree code. */
368 typedef rtx (*lang_expand_expr_t
)
369 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
370 enum expand_modifier modifier
));
372 lang_expand_expr_t lang_expand_expr
= 0;
374 /* Pointer to function to finish handling an incomplete decl at the
375 end of compilation. */
377 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
379 /* Nonzero if doing dwarf2 duplicate elimination. */
381 int flag_eliminate_dwarf2_dups
= 0;
383 /* Nonzero if generating code to do profiling. */
385 int profile_flag
= 0;
387 /* Nonzero if generating code to profile program flow graph arcs. */
389 int profile_arc_flag
= 0;
391 /* Nonzero if generating info for gcov to calculate line test coverage. */
393 int flag_test_coverage
= 0;
395 /* Nonzero indicates that branch taken probabilities should be calculated. */
397 int flag_branch_probabilities
= 0;
399 /* Nonzero if basic blocks should be reordered. */
401 int flag_reorder_blocks
= 0;
403 /* Nonzero if registers should be renamed. */
405 int flag_rename_registers
= 0;
406 int flag_cprop_registers
= 0;
408 /* Nonzero for -pedantic switch: warn about anything
409 that standard spec forbids. */
413 /* Temporarily suppress certain warnings.
414 This is set while reading code from a system header file. */
416 int in_system_header
= 0;
418 /* Don't print functions as they are compiled. -quiet. */
422 /* Print times taken by the various passes. -ftime-report. */
426 /* Print memory still in use at end of compilation (which may have little
427 to do with peak memory consumption). -fmem-report. */
431 /* Non-zero means to collect statistics which might be expensive
432 and to print them when we are done. */
433 int flag_detailed_statistics
= 0;
438 /* Nonzero means `char' should be signed. */
440 int flag_signed_char
;
442 /* Nonzero means give an enum type only as many bytes as it needs. */
444 int flag_short_enums
;
446 /* Nonzero for -fcaller-saves: allocate values in regs that need to
447 be saved across function calls, if that produces overall better code.
448 Optional now, so people can test it. */
450 #ifdef DEFAULT_CALLER_SAVES
451 int flag_caller_saves
= 1;
453 int flag_caller_saves
= 0;
456 /* Nonzero if structures and unions should be returned in memory.
458 This should only be defined if compatibility with another compiler or
459 with an ABI is needed, because it results in slower code. */
461 #ifndef DEFAULT_PCC_STRUCT_RETURN
462 #define DEFAULT_PCC_STRUCT_RETURN 1
465 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
467 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
469 /* Nonzero for -fforce-mem: load memory value into a register
470 before arithmetic on it. This makes better cse but slower compilation. */
472 int flag_force_mem
= 0;
474 /* Nonzero for -fforce-addr: load memory address into a register before
475 reference to memory. This makes better cse but slower compilation. */
477 int flag_force_addr
= 0;
479 /* Nonzero for -fdefer-pop: don't pop args after each function call;
480 instead save them up to pop many calls' args with one insns. */
482 int flag_defer_pop
= 0;
484 /* Nonzero for -ffloat-store: don't allocate floats and doubles
485 in extended-precision registers. */
487 int flag_float_store
= 0;
489 /* Nonzero for -fcse-follow-jumps:
490 have cse follow jumps to do a more extensive job. */
492 int flag_cse_follow_jumps
;
494 /* Nonzero for -fcse-skip-blocks:
495 have cse follow a branch around a block. */
496 int flag_cse_skip_blocks
;
498 /* Nonzero for -fexpensive-optimizations:
499 perform miscellaneous relatively-expensive optimizations. */
500 int flag_expensive_optimizations
;
502 /* Nonzero for -fthread-jumps:
503 have jump optimize output of loop. */
505 int flag_thread_jumps
;
507 /* Nonzero enables strength-reduction in loop.c. */
509 int flag_strength_reduce
= 0;
511 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
512 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
513 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
516 int flag_unroll_loops
;
518 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
519 This is generally not a win. */
521 int flag_unroll_all_loops
;
523 /* Nonzero enables prefetch optimizations for arrays in loops. */
525 int flag_prefetch_loop_arrays
;
527 /* Nonzero forces all invariant computations in loops to be moved
530 int flag_move_all_movables
= 0;
532 /* Nonzero forces all general induction variables in loops to be
535 int flag_reduce_all_givs
= 0;
537 /* Nonzero to perform full register move optimization passes. This is the
540 int flag_regmove
= 0;
542 /* Nonzero for -fwritable-strings:
543 store string constants in data segment and don't uniquize them. */
545 int flag_writable_strings
= 0;
547 /* Nonzero means don't put addresses of constant functions in registers.
548 Used for compiling the Unix kernel, where strange substitutions are
549 done on the assembly output. */
551 int flag_no_function_cse
= 0;
553 /* Nonzero for -fomit-frame-pointer:
554 don't make a frame pointer in simple functions that don't require one. */
556 int flag_omit_frame_pointer
= 0;
558 /* Nonzero means place each function into its own section on those platforms
559 which support arbitrary section names and unlimited numbers of sections. */
561 int flag_function_sections
= 0;
563 /* ... and similar for data. */
565 int flag_data_sections
= 0;
567 /* Nonzero to inhibit use of define_optimization peephole opts. */
569 int flag_no_peephole
= 0;
571 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
573 int flag_optimize_sibling_calls
= 0;
575 /* Nonzero means the front end generally wants `errno' maintained by math
576 operations, like built-in SQRT. */
578 int flag_errno_math
= 1;
580 /* Nonzero means that unsafe floating-point math optimizations are allowed
581 for the sake of speed. IEEE compliance is not guaranteed, and operations
582 are allowed to assume that their arguments and results are "normal"
583 (e.g., nonnegative for SQRT). */
585 int flag_unsafe_math_optimizations
= 0;
587 /* Zero means that floating-point math operations cannot generate a
588 (user-visible) trap. This is the case, for example, in nonstop
589 IEEE 754 arithmetic. */
591 int flag_trapping_math
= 1;
593 /* 0 means straightforward implementation of complex divide acceptable.
594 1 means wide ranges of inputs must work for complex divide.
595 2 means C99-like requirements for complex divide (not yet implemented). */
597 int flag_complex_divide_method
= 0;
599 /* Nonzero means all references through pointers are volatile. */
603 /* Nonzero means treat all global and extern variables as volatile. */
605 int flag_volatile_global
;
607 /* Nonzero means treat all static variables as volatile. */
609 int flag_volatile_static
;
611 /* Nonzero means just do syntax checking; don't output anything. */
613 int flag_syntax_only
= 0;
615 /* Nonzero means perform global cse. */
617 static int flag_gcse
;
619 /* Nonzero means to use global dataflow analysis to eliminate
620 useless null pointer tests. */
622 static int flag_delete_null_pointer_checks
;
624 /* Nonzero means to do the enhanced load motion during gcse, which trys
625 to hoist loads by not killing them when a store to the same location
628 int flag_gcse_lm
= 1;
630 /* Nonzero means to perform store motion after gcse, which will try to
631 move stores closer to the exit block. Its not very effective without
634 int flag_gcse_sm
= 1;
636 /* Nonzero means to rerun cse after loop optimization. This increases
637 compilation time about 20% and picks up a few more common expressions. */
639 static int flag_rerun_cse_after_loop
;
641 /* Nonzero means to run loop optimizations twice. */
643 int flag_rerun_loop_opt
;
645 /* Nonzero for -finline-functions: ok to inline functions that look like
646 good inline candidates. */
648 int flag_inline_functions
;
650 /* Nonzero for -fkeep-inline-functions: even if we make a function
651 go inline everywhere, keep its definition around for debugging
654 int flag_keep_inline_functions
;
656 /* Nonzero means that functions will not be inlined. */
660 /* Nonzero means that we should emit static const variables
661 regardless of whether or not optimization is turned on. */
663 int flag_keep_static_consts
= 1;
665 /* Nonzero means we should be saving declaration info into a .X file. */
667 int flag_gen_aux_info
= 0;
669 /* Specified name of aux-info file. */
671 static char *aux_info_file_name
;
673 /* Nonzero means make the text shared if supported. */
675 int flag_shared_data
;
677 /* Nonzero means schedule into delayed branch slots if supported. */
679 int flag_delayed_branch
;
681 /* Nonzero if we are compiling pure (sharable) code.
682 Value is 1 if we are doing reasonable (i.e. simple
683 offset into offset table) pic. Value is 2 if we can
684 only perform register offsets. */
688 /* Nonzero means generate extra code for exception handling and enable
689 exception handling. */
693 /* Nonzero means generate frame unwind info table when supported. */
695 int flag_unwind_tables
= 0;
697 /* Nonzero means generate frame unwind info table exact at each insn boundary */
699 int flag_asynchronous_unwind_tables
= 0;
701 /* Nonzero means don't place uninitialized global data in common storage
706 /* Nonzero means change certain warnings into errors.
707 Usually these are warnings about failure to conform to some standard. */
709 int flag_pedantic_errors
= 0;
711 /* flag_schedule_insns means schedule insns within basic blocks (before
713 flag_schedule_insns_after_reload means schedule insns after
716 int flag_schedule_insns
= 0;
717 int flag_schedule_insns_after_reload
= 0;
719 /* The following flags have effect only for scheduling before register
722 flag_schedule_interblock means schedule insns accross basic blocks.
723 flag_schedule_speculative means allow speculative motion of non-load insns.
724 flag_schedule_speculative_load means allow speculative motion of some
726 flag_schedule_speculative_load_dangerous allows speculative motion of more
729 int flag_schedule_interblock
= 1;
730 int flag_schedule_speculative
= 1;
731 int flag_schedule_speculative_load
= 0;
732 int flag_schedule_speculative_load_dangerous
= 0;
734 int flag_single_precision_constant
;
736 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
737 by a cheaper branch on a count register. */
738 int flag_branch_on_count_reg
= 1;
740 /* -finhibit-size-directive inhibits output of .size for ELF.
741 This is used only for compiling crtstuff.c,
742 and it may be extended to other effects
743 needed for crtstuff.c on other systems. */
744 int flag_inhibit_size_directive
= 0;
746 /* -fverbose-asm causes extra commentary information to be produced in
747 the generated assembly code (to make it more readable). This option
748 is generally only of use to those who actually need to read the
749 generated assembly code (perhaps while debugging the compiler itself).
750 -fno-verbose-asm, the default, causes the extra information
751 to be omitted and is useful when comparing two assembler files. */
753 int flag_verbose_asm
= 0;
755 /* -dA causes debug commentary information to be produced in
756 the generated assembly code (to make it more readable). This option
757 is generally only of use to those who actually need to read the
758 generated assembly code (perhaps while debugging the compiler itself).
759 Currently, this switch is only used by dwarfout.c; however, it is intended
760 to be a catchall for printing debug information in the assembler file. */
762 int flag_debug_asm
= 0;
764 /* -dP causes the rtl to be emitted as a comment in assembly. */
766 int flag_dump_rtl_in_asm
= 0;
768 /* -fgnu-linker specifies use of the GNU linker for initializations.
769 (Or, more generally, a linker that handles initializations.)
770 -fno-gnu-linker says that collect2 will be used. */
772 int flag_gnu_linker
= 0;
774 int flag_gnu_linker
= 1;
777 /* Nonzero means put zero initialized data in the bss section. */
778 int flag_zero_initialized_in_bss
= 1;
783 /* Enable ssa conditional constant propagation. */
784 int flag_ssa_ccp
= 0;
786 /* Enable ssa aggressive dead code elimination. */
787 int flag_ssa_dce
= 0;
789 /* Tag all structures with __attribute__(packed). */
790 int flag_pack_struct
= 0;
792 /* Emit code to check for stack overflow; also may cause large objects
793 to be allocated dynamically. */
794 int flag_stack_check
;
796 /* When non-NULL, indicates that whenever space is allocated on the
797 stack, the resulting stack pointer must not pass this
798 address---that is, for stacks that grow downward, the stack pointer
799 must always be greater than or equal to this address; for stacks
800 that grow upward, the stack pointer must be less than this address.
801 At present, the rtx may be either a REG or a SYMBOL_REF, although
802 the support provided depends on the backend. */
805 /* 0 if pointer arguments may alias each other. True in C.
806 1 if pointer arguments may not alias each other but may alias
808 2 if pointer arguments may not alias each other and may not
809 alias global variables. True in Fortran.
810 This defaults to 0 for C. */
811 int flag_argument_noalias
= 0;
813 /* Nonzero if we should do (language-dependent) alias analysis.
814 Typically, this analysis will assume that expressions of certain
815 types do not alias expressions of certain other types. Only used
816 if alias analysis (in general) is enabled. */
817 int flag_strict_aliasing
= 0;
819 /* Instrument functions with calls at entry and exit, for profiling. */
820 int flag_instrument_function_entry_exit
= 0;
822 /* Nonzero means ignore `#ident' directives. 0 means handle them.
823 On SVR4 targets, it also controls whether or not to emit a
824 string identifying the compiler. */
826 int flag_no_ident
= 0;
828 /* This will perform a peephole pass before sched2. */
829 int flag_peephole2
= 0;
831 /* This will try to guess branch probabilities. */
832 int flag_guess_branch_prob
= 0;
834 /* -fbounded-pointers causes gcc to compile pointers as composite
835 objects occupying three words: the pointer value, the base address
836 of the referent object, and the address immediately beyond the end
837 of the referent object. The base and extent allow us to perform
838 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
839 int flag_bounded_pointers
= 0;
841 /* -fcheck-bounds causes gcc to generate array bounds checks.
842 For C, C++: defaults to value of flag_bounded_pointers.
843 For ObjC: defaults to off.
844 For Java: defaults to on.
845 For Fortran: defaults to off.
846 For CHILL: defaults to off. */
847 int flag_bounds_check
= 0;
849 /* This will attempt to merge constant section constants, if 1 only
850 string constants and constants from constant pool, if 2 also constant
852 int flag_merge_constants
= 1;
854 /* If one, renumber instruction UIDs to reduce the number of
855 unused UIDs if there are a lot of instructions. If greater than
856 one, unconditionally renumber instruction UIDs. */
857 int flag_renumber_insns
= 1;
859 /* Values of the -falign-* flags: how much to align labels in code.
860 0 means `use default', 1 means `don't align'.
861 For each variable, there is an _log variant which is the power
862 of two not less than the variable, for .align output. */
866 int align_loops_max_skip
;
869 int align_jumps_max_skip
;
871 int align_labels_log
;
872 int align_labels_max_skip
;
874 int align_functions_log
;
876 /* Table of supported debugging formats. */
879 const char *const arg
;
880 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
881 constant expression, we use NO_DEBUG in its place. */
882 const enum debug_info_type debug_type
;
883 const int use_extensions_p
;
884 const char *const description
;
888 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
889 N_("Generate debugging info in default format") },
890 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
891 #ifdef DBX_DEBUGGING_INFO
892 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
893 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
895 #ifdef DWARF_DEBUGGING_INFO
896 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
897 { "dwarf+", DWARF_DEBUG
, 1,
898 N_("Generate extended DWARF-1 format debug info") },
900 #ifdef DWARF2_DEBUGGING_INFO
901 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
903 #ifdef XCOFF_DEBUGGING_INFO
904 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
905 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
907 #ifdef SDB_DEBUGGING_INFO
908 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
910 #ifdef VMS_DEBUGGING_INFO
911 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
918 const char *const string
;
921 const char *const description
;
923 lang_independent_options
;
927 /* Add or remove a leading underscore from user symbols. */
928 int flag_leading_underscore
= -1;
930 /* The user symbol prefix after having resolved same. */
931 const char *user_label_prefix
;
933 static const param_info lang_independent_params
[] = {
934 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
935 { OPTION, DEFAULT, HELP },
936 #include "params.def"
941 /* A default for same. */
942 #ifndef USER_LABEL_PREFIX
943 #define USER_LABEL_PREFIX ""
946 /* Table of language-independent -f options.
947 STRING is the option name. VARIABLE is the address of the variable.
948 ON_VALUE is the value to store in VARIABLE
949 if `-fSTRING' is seen as an option.
950 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
952 static const lang_independent_options f_options
[] =
954 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
955 N_("Perform DWARF2 duplicate elimination") },
956 {"float-store", &flag_float_store
, 1,
957 N_("Do not store floats in registers") },
958 {"volatile", &flag_volatile
, 1,
959 N_("Consider all mem refs through pointers as volatile") },
960 {"volatile-global", &flag_volatile_global
, 1,
961 N_("Consider all mem refs to global data to be volatile") },
962 {"volatile-static", &flag_volatile_static
, 1,
963 N_("Consider all mem refs to static data to be volatile") },
964 {"defer-pop", &flag_defer_pop
, 1,
965 N_("Defer popping functions args from stack until later") },
966 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
967 N_("When possible do not generate stack frames") },
968 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
969 N_("Optimize sibling and tail recursive calls") },
970 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
971 N_("When running CSE, follow jumps to their targets") },
972 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
973 N_("When running CSE, follow conditional jumps") },
974 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
975 N_("Perform a number of minor, expensive optimizations") },
976 {"thread-jumps", &flag_thread_jumps
, 1,
977 N_("Perform jump threading optimizations") },
978 {"strength-reduce", &flag_strength_reduce
, 1,
979 N_("Perform strength reduction optimizations") },
980 {"unroll-loops", &flag_unroll_loops
, 1,
981 N_("Perform loop unrolling when iteration count is known") },
982 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
983 N_("Perform loop unrolling for all loops") },
984 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
985 N_("Generate prefetch instructions, if available, for arrays in loops") },
986 {"move-all-movables", &flag_move_all_movables
, 1,
987 N_("Force all loop invariant computations out of loops") },
988 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
989 N_("Strength reduce all loop general induction variables") },
990 {"writable-strings", &flag_writable_strings
, 1,
991 N_("Store strings in writable data section") },
992 {"peephole", &flag_no_peephole
, 0,
993 N_("Enable machine specific peephole optimizations") },
994 {"force-mem", &flag_force_mem
, 1,
995 N_("Copy memory operands into registers before using") },
996 {"force-addr", &flag_force_addr
, 1,
997 N_("Copy memory address constants into regs before using") },
998 {"function-cse", &flag_no_function_cse
, 0,
999 N_("Allow function addresses to be held in registers") },
1000 {"inline-functions", &flag_inline_functions
, 1,
1001 N_("Integrate simple functions into their callers") },
1002 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1003 N_("Generate code for funcs even if they are fully inlined") },
1004 {"inline", &flag_no_inline
, 0,
1005 N_("Pay attention to the 'inline' keyword") },
1006 {"keep-static-consts", &flag_keep_static_consts
, 1,
1007 N_("Emit static const variables even if they are not used") },
1008 {"syntax-only", &flag_syntax_only
, 1,
1009 N_("Check for syntax errors, then stop") },
1010 {"shared-data", &flag_shared_data
, 1,
1011 N_("Mark data as shared rather than private") },
1012 {"caller-saves", &flag_caller_saves
, 1,
1013 N_("Enable saving registers around function calls") },
1014 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1015 N_("Return 'short' aggregates in memory, not registers") },
1016 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1017 N_("Return 'short' aggregates in registers") },
1018 {"delayed-branch", &flag_delayed_branch
, 1,
1019 N_("Attempt to fill delay slots of branch instructions") },
1020 {"gcse", &flag_gcse
, 1,
1021 N_("Perform the global common subexpression elimination") },
1022 {"gcse-lm", &flag_gcse_lm
, 1,
1023 N_("Perform enhanced load motion during global subexpression elimination") },
1024 {"gcse-sm", &flag_gcse_sm
, 1,
1025 N_("Perform store motion after global subexpression elimination") },
1026 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1027 N_("Run CSE pass after loop optimizations") },
1028 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1029 N_("Run the loop optimizer twice") },
1030 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1031 N_("Delete useless null pointer checks") },
1032 {"schedule-insns", &flag_schedule_insns
, 1,
1033 N_("Reschedule instructions before register allocation") },
1034 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1035 N_("Reschedule instructions after register allocation") },
1036 {"sched-interblock",&flag_schedule_interblock
, 1,
1037 N_("Enable scheduling across basic blocks") },
1038 {"sched-spec",&flag_schedule_speculative
, 1,
1039 N_("Allow speculative motion of non-loads") },
1040 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1041 N_("Allow speculative motion of some loads") },
1042 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1043 N_("Allow speculative motion of more loads") },
1044 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1045 N_("Replace add,compare,branch with branch on count reg") },
1046 {"pic", &flag_pic
, 1,
1047 N_("Generate position independent code, if possible") },
1048 {"PIC", &flag_pic
, 2, ""},
1049 {"exceptions", &flag_exceptions
, 1,
1050 N_("Enable exception handling") },
1051 {"unwind-tables", &flag_unwind_tables
, 1,
1052 N_("Just generate unwind tables for exception handling") },
1053 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1054 N_("Generate unwind tables exact at each instruction boundary") },
1055 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1056 N_("Support synchronous non-call exceptions") },
1057 {"profile-arcs", &profile_arc_flag
, 1,
1058 N_("Insert arc based program profiling code") },
1059 {"test-coverage", &flag_test_coverage
, 1,
1060 N_("Create data files needed by gcov") },
1061 {"branch-probabilities", &flag_branch_probabilities
, 1,
1062 N_("Use profiling information for branch probabilities") },
1063 {"reorder-blocks", &flag_reorder_blocks
, 1,
1064 N_("Reorder basic blocks to improve code placement") },
1065 {"rename-registers", &flag_rename_registers
, 1,
1066 N_("Do the register renaming optimization pass") },
1067 {"cprop-registers", &flag_cprop_registers
, 1,
1068 N_("Do the register copy-propagation optimization pass") },
1069 {"common", &flag_no_common
, 0,
1070 N_("Do not put uninitialized globals in the common section") },
1071 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1072 N_("Do not generate .size directives") },
1073 {"function-sections", &flag_function_sections
, 1,
1074 N_("place each function into its own section") },
1075 {"data-sections", &flag_data_sections
, 1,
1076 N_("place data items into their own section") },
1077 {"verbose-asm", &flag_verbose_asm
, 1,
1078 N_("Add extra commentry to assembler output") },
1079 {"gnu-linker", &flag_gnu_linker
, 1,
1080 N_("Output GNU ld formatted global initializers") },
1081 {"regmove", &flag_regmove
, 1,
1082 N_("Enables a register move optimization") },
1083 {"optimize-register-move", &flag_regmove
, 1,
1084 N_("Do the full regmove optimization pass") },
1085 {"pack-struct", &flag_pack_struct
, 1,
1086 N_("Pack structure members together without holes") },
1087 {"stack-check", &flag_stack_check
, 1,
1088 N_("Insert stack checking code into the program") },
1089 {"argument-alias", &flag_argument_noalias
, 0,
1090 N_("Specify that arguments may alias each other & globals") },
1091 {"argument-noalias", &flag_argument_noalias
, 1,
1092 N_("Assume arguments may alias globals but not each other") },
1093 {"argument-noalias-global", &flag_argument_noalias
, 2,
1094 N_("Assume arguments do not alias each other or globals") },
1095 {"strict-aliasing", &flag_strict_aliasing
, 1,
1096 N_("Assume strict aliasing rules apply") },
1097 {"align-loops", &align_loops
, 0,
1098 N_("Align the start of loops") },
1099 {"align-jumps", &align_jumps
, 0,
1100 N_("Align labels which are only reached by jumping") },
1101 {"align-labels", &align_labels
, 0,
1102 N_("Align all labels") },
1103 {"align-functions", &align_functions
, 0,
1104 N_("Align the start of functions") },
1105 {"merge-constants", &flag_merge_constants
, 1,
1106 N_("Attempt to merge identical constants accross compilation units") },
1107 {"merge-all-constants", &flag_merge_constants
, 2,
1108 N_("Attempt to merge identical constants and constant variables") },
1109 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1110 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1111 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1112 N_("Instrument function entry/exit with profiling calls") },
1113 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1,
1114 N_("Put zero initialized data in the bss section") },
1115 {"ssa", &flag_ssa
, 1,
1116 N_("Enable SSA optimizations") },
1117 {"ssa-ccp", &flag_ssa_ccp
, 1,
1118 N_("Enable SSA conditional constant propagation") },
1119 {"ssa-dce", &flag_ssa_dce
, 1,
1120 N_("Enable aggressive SSA dead code elimination") },
1121 {"leading-underscore", &flag_leading_underscore
, 1,
1122 N_("External symbols have a leading underscore") },
1123 {"ident", &flag_no_ident
, 0,
1124 N_("Process #ident directives") },
1125 { "peephole2", &flag_peephole2
, 1,
1126 N_("Enables an rtl peephole pass run before sched2") },
1127 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1128 N_("Enables guessing of branch probabilities") },
1129 {"math-errno", &flag_errno_math
, 1,
1130 N_("Set errno after built-in math functions") },
1131 {"trapping-math", &flag_trapping_math
, 1,
1132 N_("Floating-point operations can trap") },
1133 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1134 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1135 {"bounded-pointers", &flag_bounded_pointers
, 1,
1136 N_("Compile pointers as triples: value, base & end") },
1137 {"bounds-check", &flag_bounds_check
, 1,
1138 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1139 {"single-precision-constant", &flag_single_precision_constant
, 1,
1140 N_("Convert floating point constant to single precision constant") },
1141 {"time-report", &time_report
, 1,
1142 N_("Report time taken by each compiler pass at end of run") },
1143 {"mem-report", &mem_report
, 1,
1144 N_("Report on permanent memory allocation at end of run") },
1145 { "trapv", &flag_trapv
, 1,
1146 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1149 /* Table of language-specific options. */
1151 static const struct lang_opt
1153 const char *const option
;
1154 const char *const description
;
1156 documented_lang_options
[] =
1158 /* In order not to overload the --help output, the convention
1159 used here is to only describe those options which are not
1160 enabled by default. */
1163 N_("Compile just for ISO C89") },
1165 N_("Determine language standard") },
1167 { "-fsigned-bitfields", "" },
1168 { "-funsigned-bitfields",
1169 N_("Make bit-fields by unsigned by default") },
1170 { "-fno-signed-bitfields", "" },
1171 { "-fno-unsigned-bitfields","" },
1173 N_("Make 'char' be signed by default") },
1174 { "-funsigned-char",
1175 N_("Make 'char' be unsigned by default") },
1176 { "-fno-signed-char", "" },
1177 { "-fno-unsigned-char", "" },
1181 N_("Do not recognize the 'asm' keyword") },
1182 { "-fbuiltin", "" },
1184 N_("Do not recognize any built in functions") },
1186 N_("Assume normal C execution environment") },
1187 { "-fno-hosted", "" },
1189 N_("Assume that standard libraries & main might not exist") },
1190 { "-fno-freestanding", "" },
1191 { "-fcond-mismatch",
1192 N_("Allow different types as args of ? operator") },
1193 { "-fno-cond-mismatch", "" },
1194 { "-fdollars-in-identifiers",
1195 N_("Allow the use of $ inside identifiers") },
1196 { "-fno-dollars-in-identifiers", "" },
1197 { "-fpreprocessed", "" },
1198 { "-fno-preprocessed", "" },
1200 N_("Use the same size for double as for float") },
1201 { "-fno-short-double", "" },
1203 N_("Use the smallest fitting integer to hold enums") },
1204 { "-fno-short-enums", "" },
1206 N_("Override the underlying type for wchar_t to `unsigned short'") },
1207 { "-fno-short-wchar", "" },
1210 N_("Enable most warning messages") },
1211 { "-Wbad-function-cast",
1212 N_("Warn about casting functions to incompatible types") },
1213 { "-Wno-bad-function-cast", "" },
1214 { "-Wmissing-format-attribute",
1215 N_("Warn about functions which might be candidates for format attributes") },
1216 { "-Wno-missing-format-attribute", "" },
1218 N_("Warn about casts which discard qualifiers") },
1219 { "-Wno-cast-qual", "" },
1220 { "-Wchar-subscripts",
1221 N_("Warn about subscripts whose type is 'char'") },
1222 { "-Wno-char-subscripts", "" },
1224 N_("Warn if nested comments are detected") },
1225 { "-Wno-comment", "" },
1227 N_("Warn if nested comments are detected") },
1228 { "-Wno-comments", "" },
1230 N_("Warn about possibly confusing type conversions") },
1231 { "-Wno-conversion", "" },
1232 { "-Wdiv-by-zero", "" },
1233 { "-Wno-div-by-zero",
1234 N_("Do not warn about compile-time integer division by zero") },
1236 N_("Warn about testing equality of floating point numbers") },
1237 { "-Wno-float-equal", "" },
1239 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1240 { "-Wno-format", "" },
1241 { "-Wformat-extra-args", "" },
1242 { "-Wno-format-extra-args",
1243 N_("Don't warn about too many arguments to format functions") },
1244 { "-Wformat-nonliteral",
1245 N_("Warn about non-string-literal format strings") },
1246 { "-Wno-format-nonliteral", "" },
1247 { "-Wformat-security",
1248 N_("Warn about possible security problems with format functions") },
1249 { "-Wno-format-security", "" },
1250 { "-Wformat-y2k", "" },
1251 { "-Wno-format-y2k",
1252 N_("Don't warn about strftime formats yielding 2 digit years") },
1253 { "-Wimplicit-function-declaration",
1254 N_("Warn about implicit function declarations") },
1255 { "-Wno-implicit-function-declaration", "" },
1256 { "-Werror-implicit-function-declaration", "" },
1258 N_("Warn when a declaration does not specify a type") },
1259 { "-Wno-implicit-int", "" },
1260 { "-Wimplicit", "" },
1261 { "-Wno-implicit", "" },
1263 N_("Warn about the use of the #import directive") },
1264 { "-Wno-import", "" },
1265 { "-Wlong-long","" },
1267 N_("Do not warn about using 'long long' when -pedantic") },
1269 N_("Warn about suspicious declarations of main") },
1270 { "-Wno-main", "" },
1271 { "-Wmissing-braces",
1272 N_("Warn about possibly missing braces around initializers") },
1273 { "-Wno-missing-braces", "" },
1274 { "-Wmissing-declarations",
1275 N_("Warn about global funcs without previous declarations") },
1276 { "-Wno-missing-declarations", "" },
1277 { "-Wmissing-prototypes",
1278 N_("Warn about global funcs without prototypes") },
1279 { "-Wno-missing-prototypes", "" },
1281 N_("Warn about use of multicharacter literals") },
1282 { "-Wno-multichar", "" },
1283 { "-Wnested-externs",
1284 N_("Warn about externs not at file scope level") },
1285 { "-Wno-nested-externs", "" },
1287 N_("Warn about possible missing parentheses") },
1288 { "-Wno-parentheses", "" },
1289 { "-Wpointer-arith",
1290 N_("Warn about function pointer arithmetic") },
1291 { "-Wno-pointer-arith", "" },
1292 { "-Wredundant-decls",
1293 N_("Warn about multiple declarations of the same object") },
1294 { "-Wno-redundant-decls", "" },
1296 N_("Warn whenever a function's return-type defaults to int") },
1297 { "-Wno-return-type", "" },
1298 { "-Wsequence-point",
1299 N_("Warn about possible violations of sequence point rules") },
1300 { "-Wno-sequence-point", "" },
1302 N_("Warn about signed/unsigned comparisons") },
1303 { "-Wno-sign-compare", "" },
1304 { "-Wstrict-prototypes",
1305 N_("Warn about non-prototyped function decls") },
1306 { "-Wno-strict-prototypes", "" },
1308 N_("Warn about constructs whose meanings change in ISO C") },
1309 { "-Wno-traditional", "" },
1311 N_("Warn when trigraphs are encountered") },
1312 { "-Wno-trigraphs", "" },
1314 { "-Wno-undef", "" },
1315 { "-Wunknown-pragmas",
1316 N_("Warn about unrecognized pragmas") },
1317 { "-Wno-unknown-pragmas", "" },
1318 { "-Wwrite-strings",
1319 N_("Mark strings as 'const char *'") },
1320 { "-Wno-write-strings", "" },
1322 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1324 #include "options.h"
1328 /* Here is a table, controlled by the tm.h file, listing each -m switch
1329 and which bits in `target_switches' it should set or clear.
1330 If VALUE is positive, it is bits to set.
1331 If VALUE is negative, -VALUE is bits to clear.
1332 (The sign bit is not used so there is no confusion.) */
1336 const char *const name
;
1338 const char *const description
;
1340 target_switches
[] = TARGET_SWITCHES
;
1342 /* This table is similar, but allows the switch to have a value. */
1344 #ifdef TARGET_OPTIONS
1347 const char *const prefix
;
1348 const char **const variable
;
1349 const char *const description
;
1351 target_options
[] = TARGET_OPTIONS
;
1354 /* Options controlling warnings. */
1356 /* Don't print warning messages. -w. */
1358 int inhibit_warnings
= 0;
1360 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1362 int warn_system_headers
= 0;
1364 /* Print various extra warnings. -W. */
1366 int extra_warnings
= 0;
1368 /* Treat warnings as errors. -Werror. */
1370 int warnings_are_errors
= 0;
1372 /* Nonzero to warn about unused variables, functions et.al. */
1374 int warn_unused_function
;
1375 int warn_unused_label
;
1376 int warn_unused_parameter
;
1377 int warn_unused_variable
;
1378 int warn_unused_value
;
1380 /* Nonzero to warn about code which is never reached. */
1382 int warn_notreached
;
1384 /* Nonzero to warn about variables used before they are initialized. */
1386 int warn_uninitialized
;
1388 /* Nonzero means warn about all declarations which shadow others. */
1392 /* Warn if a switch on an enum fails to have a case for every enum value. */
1396 /* Nonzero means warn about function definitions that default the return type
1397 or that use a null return and have a return-type other than void. */
1399 int warn_return_type
;
1401 /* Nonzero means warn about pointer casts that increase the required
1402 alignment of the target type (and might therefore lead to a crash
1403 due to a misaligned access). */
1405 int warn_cast_align
;
1407 /* Nonzero means warn about any objects definitions whose size is larger
1408 than N bytes. Also want about function definitions whose returned
1409 values are larger than N bytes. The value N is in `larger_than_size'. */
1411 int warn_larger_than
;
1412 HOST_WIDE_INT larger_than_size
;
1414 /* Nonzero means warn if inline function is too large. */
1418 /* Warn if a function returns an aggregate,
1419 since there are often incompatible calling conventions for doing this. */
1421 int warn_aggregate_return
;
1423 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1427 /* Warn when gcc pads a structure to an alignment boundary. */
1431 /* Warn when an optimization pass is disabled. */
1433 int warn_disabled_optimization
;
1435 /* Warn about functions which might be candidates for attribute noreturn. */
1437 int warn_missing_noreturn
;
1439 /* Nonzero means warn about uses of __attribute__((deprecated))
1442 int warn_deprecated_decl
= 1;
1444 /* Likewise for -W. */
1446 static const lang_independent_options W_options
[] =
1448 {"unused-function", &warn_unused_function
, 1,
1449 N_("Warn when a function is unused") },
1450 {"unused-label", &warn_unused_label
, 1,
1451 N_("Warn when a label is unused") },
1452 {"unused-parameter", &warn_unused_parameter
, 1,
1453 N_("Warn when a function parameter is unused") },
1454 {"unused-variable", &warn_unused_variable
, 1,
1455 N_("Warn when a variable is unused") },
1456 {"unused-value", &warn_unused_value
, 1,
1457 N_("Warn when an expression value is unused") },
1458 {"system-headers", &warn_system_headers
, 1,
1459 N_("Do not suppress warnings from system headers") },
1460 {"error", &warnings_are_errors
, 1,
1461 N_("Treat all warnings as errors") },
1462 {"shadow", &warn_shadow
, 1,
1463 N_("Warn when one local variable shadows another") },
1464 {"switch", &warn_switch
, 1,
1465 N_("Warn about enumerated switches missing a specific case") },
1466 {"aggregate-return", &warn_aggregate_return
, 1,
1467 N_("Warn about returning structures, unions or arrays") },
1468 {"cast-align", &warn_cast_align
, 1,
1469 N_("Warn about pointer casts which increase alignment") },
1470 {"unreachable-code", &warn_notreached
, 1,
1471 N_("Warn about code that will never be executed") },
1472 {"uninitialized", &warn_uninitialized
, 1,
1473 N_("Warn about uninitialized automatic variables") },
1474 {"inline", &warn_inline
, 1,
1475 N_("Warn when an inlined function cannot be inlined") },
1476 {"packed", &warn_packed
, 1,
1477 N_("Warn when the packed attribute has no effect on struct layout") },
1478 {"padded", &warn_padded
, 1,
1479 N_("Warn when padding is required to align struct members") },
1480 {"disabled-optimization", &warn_disabled_optimization
, 1,
1481 N_("Warn when an optimization pass is disabled") },
1482 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1483 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1484 {"missing-noreturn", &warn_missing_noreturn
, 1,
1485 N_("Warn about functions which might be candidates for attribute noreturn") }
1489 set_Wunused (setting
)
1492 warn_unused_function
= setting
;
1493 warn_unused_label
= setting
;
1494 /* Unused function parameter warnings are reported when either ``-W
1495 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1496 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1498 warn_unused_parameter
= 0;
1499 else if (!warn_unused_parameter
)
1500 warn_unused_parameter
= -1;
1501 warn_unused_variable
= setting
;
1502 warn_unused_value
= setting
;
1505 /* The following routines are useful in setting all the flags that
1506 -ffast-math and -fno-fast-math imply. */
1509 set_fast_math_flags ()
1511 flag_trapping_math
= 0;
1512 flag_unsafe_math_optimizations
= 1;
1513 flag_errno_math
= 0;
1517 set_no_fast_math_flags ()
1519 flag_trapping_math
= 1;
1520 flag_unsafe_math_optimizations
= 0;
1521 flag_errno_math
= 1;
1525 /* Output files for assembler code (real compiler output)
1526 and debugging dumps. */
1529 FILE *aux_info_file
;
1530 FILE *rtl_dump_file
= NULL
;
1532 /* Decode the string P as an integral parameter.
1533 If the string is indeed an integer return its numeric value else
1534 issue an Invalid Option error for the option PNAME and return DEFVAL.
1535 If PNAME is zero just return DEFVAL, do not call error. */
1538 read_integral_parameter (p
, pname
, defval
)
1543 const char *endp
= p
;
1547 if (ISDIGIT (*endp
))
1556 error ("invalid option `%s'", pname
);
1564 /* This is the default decl_printable_name function. */
1567 decl_name (decl
, verbosity
)
1569 int verbosity ATTRIBUTE_UNUSED
;
1571 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1575 /* This calls abort and is used to avoid problems when abort if a macro.
1576 It is used when we need to pass the address of abort. */
1584 /* When `malloc.c' is compiled with `rcheck' defined,
1585 it calls this function to report clobberage. */
1589 const char *s ATTRIBUTE_UNUSED
;
1594 /* Return the logarithm of X, base 2, considering X unsigned,
1595 if X is a power of 2. Otherwise, returns -1.
1597 This should be used via the `exact_log2' macro. */
1601 unsigned HOST_WIDE_INT x
;
1604 /* Test for 0 or a power of 2. */
1605 if (x
== 0 || x
!= (x
& -x
))
1607 while ((x
>>= 1) != 0)
1612 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1613 If X is 0, return -1.
1615 This should be used via the floor_log2 macro. */
1619 unsigned HOST_WIDE_INT x
;
1628 static int float_handler_set
;
1630 jmp_buf float_handler
;
1632 /* Signals actually come here. */
1635 float_signal (signo
)
1636 /* If this is missing, some compilers complain. */
1637 int signo ATTRIBUTE_UNUSED
;
1639 if (float_handled
== 0)
1640 crash_signal (signo
);
1643 /* On System-V derived systems, we must reinstall the signal handler.
1644 This is harmless on BSD-derived systems. */
1645 signal (SIGFPE
, float_signal
);
1646 longjmp (float_handler
, 1);
1649 /* Specify where to longjmp to when a floating arithmetic error happens.
1650 If HANDLER is 0, it means don't handle the errors any more. */
1653 set_float_handler (handler
)
1656 float_handled
= (handler
!= 0);
1658 memcpy (float_handler
, handler
, sizeof (float_handler
));
1660 if (float_handled
&& ! float_handler_set
)
1662 signal (SIGFPE
, float_signal
);
1663 float_handler_set
= 1;
1667 /* This is a wrapper function for code which might elicit an
1668 arithmetic exception. That code should be passed in as a function
1669 pointer FN, and one argument DATA. DATA is usually a struct which
1670 contains the real input and output for function FN. This function
1671 returns 0 (failure) if longjmp was called (i.e. an exception
1672 occurred.) It returns 1 (success) otherwise. */
1675 do_float_handler (fn
, data
)
1676 void (*fn
) PARAMS ((PTR
));
1683 /* We got here via longjmp () caused by an exception in function
1685 set_float_handler (NULL
);
1689 set_float_handler (buf
);
1691 set_float_handler (NULL
);
1695 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1696 into ICE messages, which is much more user friendly. */
1699 crash_signal (signo
)
1702 internal_error ("internal error: %s", strsignal (signo
));
1705 /* Strip off a legitimate source ending from the input string NAME of
1706 length LEN. Rather than having to know the names used by all of
1707 our front ends, we strip off an ending of a period followed by
1708 up to five characters. (Java uses ".class".) */
1711 strip_off_ending (name
, len
)
1716 for (i
= 2; i
< 6 && len
> i
; i
++)
1718 if (name
[len
- i
] == '.')
1720 name
[len
- i
] = '\0';
1726 /* Output a quoted string. */
1729 output_quoted_string (asm_file
, string
)
1733 #ifdef OUTPUT_QUOTED_STRING
1734 OUTPUT_QUOTED_STRING (asm_file
, string
);
1738 putc ('\"', asm_file
);
1739 while ((c
= *string
++) != 0)
1743 if (c
== '\"' || c
== '\\')
1744 putc ('\\', asm_file
);
1748 fprintf (asm_file
, "\\%03o", c
);
1750 putc ('\"', asm_file
);
1754 /* Output a file name in the form wanted by System V. */
1757 output_file_directive (asm_file
, input_name
)
1759 const char *input_name
;
1761 int len
= strlen (input_name
);
1762 const char *na
= input_name
+ len
;
1764 /* NA gets INPUT_NAME sans directory names. */
1765 while (na
> input_name
)
1767 if (IS_DIR_SEPARATOR (na
[-1]))
1772 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1773 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1775 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1776 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1778 fprintf (asm_file
, "\t.file\t");
1779 output_quoted_string (asm_file
, na
);
1780 fputc ('\n', asm_file
);
1785 /* Routine to open a dump file. Return true if the dump file is enabled. */
1788 open_dump_file (index
, decl
)
1789 enum dump_file_index index
;
1793 const char *open_arg
;
1796 if (! dump_file
[index
].enabled
)
1799 timevar_push (TV_DUMP
);
1800 if (rtl_dump_file
!= NULL
)
1801 fclose (rtl_dump_file
);
1803 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1805 if (! dump_file
[index
].initialized
)
1807 /* If we've not initialized the files, do so now. */
1808 if (graph_dump_format
!= no_graph
1809 && dump_file
[index
].graph_dump_p
)
1811 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1812 clean_graph_dump_file (dump_base_name
, dump_name
);
1815 dump_file
[index
].initialized
= 1;
1821 dump_name
= concat (dump_base_name
, seq
,
1822 dump_file
[index
].extension
, NULL
);
1824 rtl_dump_file
= fopen (dump_name
, open_arg
);
1825 if (rtl_dump_file
== NULL
)
1826 fatal_io_error ("can't open %s", dump_name
);
1831 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1832 decl_printable_name (decl
, 2));
1834 timevar_pop (TV_DUMP
);
1838 /* Routine to close a dump file. */
1841 close_dump_file (index
, func
, insns
)
1842 enum dump_file_index index
;
1843 void (*func
) PARAMS ((FILE *, rtx
));
1846 if (! rtl_dump_file
)
1849 timevar_push (TV_DUMP
);
1851 && graph_dump_format
!= no_graph
1852 && dump_file
[index
].graph_dump_p
)
1857 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1858 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1859 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1864 func (rtl_dump_file
, insns
);
1866 fflush (rtl_dump_file
);
1867 fclose (rtl_dump_file
);
1869 rtl_dump_file
= NULL
;
1870 timevar_pop (TV_DUMP
);
1873 /* Do any final processing required for the declarations in VEC, of
1874 which there are LEN. We write out inline functions and variables
1875 that have been deferred until this point, but which are required.
1876 Returns non-zero if anything was put out. */
1879 wrapup_global_declarations (vec
, len
)
1886 int output_something
= 0;
1888 for (i
= 0; i
< len
; i
++)
1892 /* We're not deferring this any longer. */
1893 DECL_DEFER_OUTPUT (decl
) = 0;
1895 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1896 && incomplete_decl_finalize_hook
!= 0)
1897 (*incomplete_decl_finalize_hook
) (decl
);
1900 /* Now emit any global variables or functions that we have been
1901 putting off. We need to loop in case one of the things emitted
1902 here references another one which comes earlier in the list. */
1906 for (i
= 0; i
< len
; i
++)
1910 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1913 /* Don't write out static consts, unless we still need them.
1915 We also keep static consts if not optimizing (for debugging),
1916 unless the user specified -fno-keep-static-consts.
1917 ??? They might be better written into the debug information.
1918 This is possible when using DWARF.
1920 A language processor that wants static constants to be always
1921 written out (even if it is not used) is responsible for
1922 calling rest_of_decl_compilation itself. E.g. the C front-end
1923 calls rest_of_decl_compilation from finish_decl.
1924 One motivation for this is that is conventional in some
1925 environments to write things like:
1926 static const char rcsid[] = "... version string ...";
1927 intending to force the string to be in the executable.
1929 A language processor that would prefer to have unneeded
1930 static constants "optimized away" would just defer writing
1931 them out until here. E.g. C++ does this, because static
1932 constants are often defined in header files.
1934 ??? A tempting alternative (for both C and C++) would be
1935 to force a constant to be written if and only if it is
1936 defined in a main file, as opposed to an include file. */
1938 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1942 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1944 else if (DECL_COMDAT (decl
))
1946 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1947 && (optimize
|| !flag_keep_static_consts
1948 || DECL_ARTIFICIAL (decl
)))
1954 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1958 if (TREE_CODE (decl
) == FUNCTION_DECL
1959 && DECL_INITIAL (decl
) != 0
1960 && DECL_SAVED_INSNS (decl
) != 0
1961 && (flag_keep_inline_functions
1962 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1963 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1966 output_inline_function (decl
);
1971 output_something
= 1;
1975 return output_something
;
1978 /* Issue appropriate warnings for the global declarations in VEC (of
1979 which there are LEN). Output debugging information for them. */
1982 check_global_declarations (vec
, len
)
1989 for (i
= 0; i
< len
; i
++)
1993 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1994 && ! TREE_ASM_WRITTEN (decl
))
1995 /* Cancel the RTL for this decl so that, if debugging info
1996 output for global variables is still to come,
1997 this one will be omitted. */
1998 SET_DECL_RTL (decl
, NULL_RTX
);
2000 /* Warn about any function
2001 declared static but not defined.
2002 We don't warn about variables,
2003 because many programs have static variables
2004 that exist only to get some text into the object file. */
2005 if (TREE_CODE (decl
) == FUNCTION_DECL
2006 && (warn_unused_function
2007 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2008 && DECL_INITIAL (decl
) == 0
2009 && DECL_EXTERNAL (decl
)
2010 && ! DECL_ARTIFICIAL (decl
)
2011 && ! TREE_PUBLIC (decl
))
2013 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2014 pedwarn_with_decl (decl
,
2015 "`%s' used but never defined");
2017 warning_with_decl (decl
,
2018 "`%s' declared `static' but never defined");
2019 /* This symbol is effectively an "extern" declaration now. */
2020 TREE_PUBLIC (decl
) = 1;
2021 assemble_external (decl
);
2024 /* Warn about static fns or vars defined but not used,
2025 but not about inline functions or static consts
2026 since defining those in header files is normal practice. */
2027 if (((warn_unused_function
2028 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2029 || (warn_unused_variable
2030 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2031 && ! DECL_IN_SYSTEM_HEADER (decl
)
2032 && ! DECL_EXTERNAL (decl
)
2033 && ! TREE_PUBLIC (decl
)
2034 && ! TREE_USED (decl
)
2035 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2036 /* The TREE_USED bit for file-scope decls
2037 is kept in the identifier, to handle multiple
2038 external decls in different scopes. */
2039 && ! TREE_USED (DECL_NAME (decl
)))
2040 warning_with_decl (decl
, "`%s' defined but not used");
2042 timevar_push (TV_SYMOUT
);
2043 (*debug_hooks
->global_decl
) (decl
);
2044 timevar_pop (TV_SYMOUT
);
2048 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2049 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2050 INPUT_FILENAME and LINENO accordingly. */
2053 push_srcloc (file
, line
)
2057 struct file_stack
*fs
;
2059 if (input_file_stack
)
2061 input_file_stack
->name
= input_filename
;
2062 input_file_stack
->line
= lineno
;
2065 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2066 fs
->name
= input_filename
= file
;
2067 fs
->line
= lineno
= line
;
2068 fs
->indent_level
= 0;
2069 fs
->next
= input_file_stack
;
2070 input_file_stack
= fs
;
2071 input_file_stack_tick
++;
2074 /* Pop the top entry off the stack of presently open source files.
2075 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2081 struct file_stack
*fs
;
2083 fs
= input_file_stack
;
2084 input_file_stack
= fs
->next
;
2086 input_file_stack_tick
++;
2087 /* The initial source file is never popped. */
2088 if (!input_file_stack
)
2090 input_filename
= input_file_stack
->name
;
2091 lineno
= input_file_stack
->line
;
2094 /* Compile an entire translation unit. Write a file of assembly
2095 output and various debugging dumps. */
2102 /* Initialize yet another pass. */
2104 init_final (main_input_filename
);
2105 init_branch_prob (dump_base_name
);
2107 timevar_push (TV_PARSE
);
2109 /* Call the parser, which parses the entire file (calling
2110 rest_of_compilation for each function). */
2111 (*lang_hooks
.parse_file
) ();
2113 /* In case there were missing block closers,
2114 get us back to the global binding level. */
2115 (*lang_hooks
.clear_binding_stack
) ();
2117 /* Compilation is now finished except for writing
2118 what's left of the symbol table output. */
2119 timevar_pop (TV_PARSE
);
2121 if (flag_syntax_only
)
2124 globals
= getdecls ();
2126 /* Really define vars that have had only a tentative definition.
2127 Really output inline functions that must actually be callable
2128 and have not been output so far. */
2131 int len
= list_length (globals
);
2132 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2136 /* Process the decls in reverse order--earliest first.
2137 Put them into VEC from back to front, then take out from front. */
2139 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2140 vec
[len
- i
- 1] = decl
;
2142 wrapup_global_declarations (vec
, len
);
2144 /* This must occur after the loop to output deferred functions. Else
2145 the profiler initializer would not be emitted if all the functions
2146 in this compilation unit were deferred.
2148 output_func_start_profiler can not cause any additional functions or
2149 data to need to be output, so it need not be in the deferred function
2151 output_func_start_profiler ();
2153 check_global_declarations (vec
, len
);
2159 /* Write out any pending weak symbol declarations. */
2163 /* Do dbx symbols. */
2164 timevar_push (TV_SYMOUT
);
2166 #ifdef DWARF2_UNWIND_INFO
2167 if (dwarf2out_do_frame ())
2168 dwarf2out_frame_finish ();
2171 (*debug_hooks
->finish
) (main_input_filename
);
2172 timevar_pop (TV_SYMOUT
);
2174 /* Output some stuff at end of file if nec. */
2176 dw2_output_indirect_constants ();
2178 end_final (dump_base_name
);
2180 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2182 timevar_push (TV_DUMP
);
2183 open_dump_file (DFI_bp
, NULL
);
2187 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2188 timevar_pop (TV_DUMP
);
2192 ASM_FILE_END (asm_out_file
);
2195 /* Attach a special .ident directive to the end of the file to identify
2196 the version of GCC which compiled this code. The format of the .ident
2197 string is patterned after the ones produced by native SVR4 compilers. */
2200 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2201 IDENT_ASM_OP
, version_string
);
2204 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2206 timevar_push (TV_DUMP
);
2207 dump_combine_total_stats (rtl_dump_file
);
2208 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2209 timevar_pop (TV_DUMP
);
2213 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2214 and TYPE_DECL nodes.
2216 This does nothing for local (non-static) variables, unless the
2217 variable is a register variable with an ASMSPEC. In that case, or
2218 if the variable is not an automatic, it sets up the RTL and
2219 outputs any assembler code (label definition, storage allocation
2220 and initialization).
2222 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2223 the assembler symbol name to be used. TOP_LEVEL is nonzero
2224 if this declaration is not within a function. */
2227 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2229 const char *asmspec
;
2233 /* Declarations of variables, and of functions defined elsewhere. */
2235 /* The most obvious approach, to put an #ifndef around where
2236 this macro is used, doesn't work since it's inside a macro call. */
2237 #ifndef ASM_FINISH_DECLARE_OBJECT
2238 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2241 /* We deferred calling assemble_alias so that we could collect
2242 other attributes such as visibility. Emit the alias now. */
2245 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2248 alias
= TREE_VALUE (TREE_VALUE (alias
));
2249 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2250 assemble_alias (decl
, alias
);
2254 /* Forward declarations for nested functions are not "external",
2255 but we need to treat them as if they were. */
2256 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2257 || TREE_CODE (decl
) == FUNCTION_DECL
)
2259 timevar_push (TV_VARCONST
);
2262 make_decl_rtl (decl
, asmspec
);
2264 /* Don't output anything when a tentative file-scope definition
2265 is seen. But at end of compilation, do output code for them. */
2266 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2267 assemble_variable (decl
, top_level
, at_end
, 0);
2268 if (decl
== last_assemble_variable_decl
)
2270 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2274 timevar_pop (TV_VARCONST
);
2276 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2278 if (decode_reg_name (asmspec
) >= 0)
2280 SET_DECL_RTL (decl
, NULL_RTX
);
2281 make_decl_rtl (decl
, asmspec
);
2285 error ("invalid register name `%s' for register variable", asmspec
);
2286 DECL_REGISTER (decl
) = 0;
2291 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2292 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2293 && TREE_CODE (decl
) == TYPE_DECL
)
2295 timevar_push (TV_SYMOUT
);
2296 dbxout_symbol (decl
, 0);
2297 timevar_pop (TV_SYMOUT
);
2300 #ifdef SDB_DEBUGGING_INFO
2301 else if (write_symbols
== SDB_DEBUG
&& top_level
2302 && TREE_CODE (decl
) == TYPE_DECL
)
2304 timevar_push (TV_SYMOUT
);
2305 sdbout_symbol (decl
, 0);
2306 timevar_pop (TV_SYMOUT
);
2311 /* Called after finishing a record, union or enumeral type. */
2314 rest_of_type_compilation (type
, toplev
)
2315 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2319 tree type ATTRIBUTE_UNUSED
;
2320 int toplev ATTRIBUTE_UNUSED
;
2323 timevar_push (TV_SYMOUT
);
2324 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2325 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2326 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2328 #ifdef SDB_DEBUGGING_INFO
2329 if (write_symbols
== SDB_DEBUG
)
2330 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2332 #ifdef DWARF2_DEBUGGING_INFO
2333 if ((write_symbols
== DWARF2_DEBUG
2334 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2336 dwarf2out_decl (TYPE_STUB_DECL (type
));
2338 timevar_pop (TV_SYMOUT
);
2341 /* This is called from finish_function (within langhooks.parse_file)
2342 after each top-level definition is parsed.
2343 It is supposed to compile that function or variable
2344 and output the assembler code for it.
2345 After we return, the tree storage is freed. */
2348 rest_of_compilation (decl
)
2354 int rebuild_label_notes_after_reload
;
2355 int register_life_up_to_date
;
2357 timevar_push (TV_REST_OF_COMPILATION
);
2359 /* Now that we're out of the frontend, we shouldn't have any more
2360 CONCATs anywhere. */
2361 generating_concat_p
= 0;
2363 /* When processing delayed functions, prepare_function_start() won't
2364 have been run to re-initialize it. */
2365 cse_not_expected
= ! optimize
;
2367 /* First, make sure that NOTE_BLOCK is set correctly for each
2368 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2369 if (!cfun
->x_whole_function_mode_p
)
2372 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2373 tree in sensible shape. So, we just recalculate it here. */
2374 if (cfun
->x_whole_function_mode_p
)
2379 /* If we are reconsidering an inline function
2380 at the end of compilation, skip the stuff for making it inline. */
2382 if (DECL_SAVED_INSNS (decl
) == 0)
2388 /* If this is nested inside an inlined external function, pretend
2389 it was only declared. Since we cannot inline such functions,
2390 generating code for this one is not only not necessary but will
2391 confuse some debugging output writers. */
2392 for (parent
= DECL_CONTEXT (current_function_decl
);
2393 parent
!= NULL_TREE
;
2394 parent
= get_containing_scope (parent
))
2395 if (TREE_CODE (parent
) == FUNCTION_DECL
2396 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2398 DECL_INITIAL (decl
) = 0;
2399 goto exit_rest_of_compilation
;
2402 /* If requested, consider whether to make this function inline. */
2403 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2404 || flag_inline_functions
)
2406 timevar_push (TV_INTEGRATION
);
2407 lose
= function_cannot_inline_p (decl
);
2408 timevar_pop (TV_INTEGRATION
);
2409 if (lose
|| ! optimize
)
2411 if (warn_inline
&& DECL_INLINE (decl
))
2412 warning_with_decl (decl
, lose
);
2413 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2414 /* Don't really compile an extern inline function.
2415 If we can't make it inline, pretend
2416 it was only declared. */
2417 if (DECL_EXTERNAL (decl
))
2419 DECL_INITIAL (decl
) = 0;
2420 goto exit_rest_of_compilation
;
2424 /* ??? Note that this has the effect of making it look
2425 like "inline" was specified for a function if we choose
2426 to inline it. This isn't quite right, but it's
2427 probably not worth the trouble to fix. */
2428 inlinable
= DECL_INLINE (decl
) = 1;
2431 insns
= get_insns ();
2433 /* Dump the rtl code if we are dumping rtl. */
2435 if (open_dump_file (DFI_rtl
, decl
))
2437 if (DECL_SAVED_INSNS (decl
))
2438 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2439 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2442 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2443 sorts of eh initialization. Delay this until after the
2444 initial rtl dump so that we can see the original nesting. */
2445 convert_from_eh_region_ranges ();
2447 /* If function is inline, and we don't yet know whether to
2448 compile it by itself, defer decision till end of compilation.
2449 finish_compilation will call rest_of_compilation again
2450 for those functions that need to be output. Also defer those
2451 functions that we are supposed to defer. */
2454 || (DECL_INLINE (decl
)
2455 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2456 && ! flag_keep_inline_functions
)
2457 || DECL_EXTERNAL (decl
))))
2458 DECL_DEFER_OUTPUT (decl
) = 1;
2460 if (DECL_INLINE (decl
))
2461 /* DWARF wants separate debugging info for abstract and
2462 concrete instances of all inline functions, including those
2463 declared inline but not inlined, and those inlined even
2464 though they weren't declared inline. Conveniently, that's
2465 what DECL_INLINE means at this point. */
2466 (*debug_hooks
->deferred_inline_function
) (decl
);
2468 if (DECL_DEFER_OUTPUT (decl
))
2470 /* If -Wreturn-type, we have to do a bit of compilation. We just
2471 want to call cleanup the cfg to figure out whether or not we can
2472 fall off the end of the function; we do the minimum amount of
2473 work necessary to make that safe. */
2474 if (warn_return_type
)
2476 int saved_optimize
= optimize
;
2479 rebuild_jump_labels (insns
);
2480 find_exception_handler_labels ();
2481 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2482 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2483 optimize
= saved_optimize
;
2485 /* CFG is no longer maintained up-to-date. */
2486 free_bb_for_insn ();
2489 current_function_nothrow
= nothrow_function_p ();
2490 if (current_function_nothrow
)
2491 /* Now we know that this can't throw; set the flag for the benefit
2492 of other functions later in this translation unit. */
2493 TREE_NOTHROW (current_function_decl
) = 1;
2495 timevar_push (TV_INTEGRATION
);
2496 save_for_inline (decl
);
2497 timevar_pop (TV_INTEGRATION
);
2498 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2499 goto exit_rest_of_compilation
;
2502 /* If specified extern inline but we aren't inlining it, we are
2503 done. This goes for anything that gets here with DECL_EXTERNAL
2504 set, not just things with DECL_INLINE. */
2505 if (DECL_EXTERNAL (decl
))
2506 goto exit_rest_of_compilation
;
2509 /* If we're emitting a nested function, make sure its parent gets
2510 emitted as well. Doing otherwise confuses debug info. */
2513 for (parent
= DECL_CONTEXT (current_function_decl
);
2514 parent
!= NULL_TREE
;
2515 parent
= get_containing_scope (parent
))
2516 if (TREE_CODE (parent
) == FUNCTION_DECL
)
2517 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
2520 /* We are now committed to emitting code for this function. Do any
2521 preparation, such as emitting abstract debug info for the inline
2522 before it gets mangled by optimization. */
2523 if (DECL_INLINE (decl
))
2524 (*debug_hooks
->outlining_inline_function
) (decl
);
2526 /* Remove any notes we don't need. That will make iterating
2527 over the instruction sequence faster, and allow the garbage
2528 collector to reclaim the memory used by the notes. */
2529 remove_unnecessary_notes ();
2534 /* Initialize some variables used by the optimizers. */
2535 init_function_for_compilation ();
2537 if (! DECL_DEFER_OUTPUT (decl
))
2538 TREE_ASM_WRITTEN (decl
) = 1;
2540 /* Now that integrate will no longer see our rtl, we need not
2541 distinguish between the return value of this function and the
2542 return value of called functions. Also, we can remove all SETs
2543 of subregs of hard registers; they are only here because of
2544 integrate. Also, we can now initialize pseudos intended to
2545 carry magic hard reg data throughout the function. */
2546 rtx_equal_function_value_matters
= 0;
2547 purge_hard_subreg_sets (get_insns ());
2548 emit_initial_value_sets ();
2550 /* Early return if there were errors. We can run afoul of our
2551 consistency checks, and there's not really much point in fixing them.
2552 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2553 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2554 || errorcount
|| sorrycount
)
2555 goto exit_rest_of_compilation
;
2557 /* We may have potential sibling or tail recursion sites. Select one
2558 (of possibly multiple) methods of performing the call. */
2559 if (flag_optimize_sibling_calls
)
2561 timevar_push (TV_JUMP
);
2562 open_dump_file (DFI_sibling
, decl
);
2564 optimize_sibling_and_tail_recursive_calls ();
2566 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2567 timevar_pop (TV_JUMP
);
2570 /* Complete generation of exception handling code. */
2571 find_exception_handler_labels ();
2574 timevar_push (TV_JUMP
);
2575 open_dump_file (DFI_eh
, decl
);
2577 finish_eh_generation ();
2579 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2580 timevar_pop (TV_JUMP
);
2584 /* If we are doing position-independent code generation, now
2585 is the time to output special prologues and epilogues.
2586 We do not want to do this earlier, because it just clutters
2587 up inline functions with meaningless insns. */
2592 insns
= get_insns ();
2594 /* Copy any shared structure that should not be shared. */
2595 unshare_all_rtl (current_function_decl
, insns
);
2597 #ifdef SETJMP_VIA_SAVE_AREA
2598 /* This must be performed before virtual register instantiation. */
2599 if (current_function_calls_alloca
)
2600 optimize_save_area_alloca (insns
);
2603 /* Instantiate all virtual registers. */
2604 instantiate_virtual_regs (current_function_decl
, insns
);
2606 open_dump_file (DFI_jump
, decl
);
2608 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2609 are initialized and to compute whether control can drop off the end
2612 timevar_push (TV_JUMP
);
2613 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2614 before jump optimization switches branch directions. */
2615 expected_value_to_br_prob ();
2617 reg_scan (insns
, max_reg_num (), 0);
2618 rebuild_jump_labels (insns
);
2619 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2621 dump_flow_info (rtl_dump_file
);
2622 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
2623 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2625 /* CFG is no longer maintained up-to-date. */
2626 free_bb_for_insn ();
2627 copy_loop_headers (insns
);
2628 purge_line_number_notes (insns
);
2630 timevar_pop (TV_JUMP
);
2631 close_dump_file (DFI_jump
, print_rtl
, insns
);
2633 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2634 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2636 goto exit_rest_of_compilation
;
2639 /* Long term, this should probably move before the jump optimizer too,
2640 but I didn't want to disturb the rtl_dump_and_exit and related
2641 stuff at this time. */
2642 if (optimize
> 0 && flag_ssa
)
2644 /* Convert to SSA form. */
2646 timevar_push (TV_TO_SSA
);
2647 open_dump_file (DFI_ssa
, decl
);
2649 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2650 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2653 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2654 timevar_pop (TV_TO_SSA
);
2656 /* Perform sparse conditional constant propagation, if requested. */
2659 timevar_push (TV_SSA_CCP
);
2660 open_dump_file (DFI_ssa_ccp
, decl
);
2664 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2665 timevar_pop (TV_SSA_CCP
);
2668 /* It would be useful to cleanup the CFG at this point, but block
2669 merging and possibly other transformations might leave a PHI
2670 node in the middle of a basic block, which is a strict no-no. */
2672 /* The SSA implementation uses basic block numbers in its phi
2673 nodes. Thus, changing the control-flow graph or the basic
2674 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2675 may cause problems. */
2679 /* Remove dead code. */
2681 timevar_push (TV_SSA_DCE
);
2682 open_dump_file (DFI_ssa_dce
, decl
);
2684 insns
= get_insns ();
2685 ssa_eliminate_dead_code();
2687 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2688 timevar_pop (TV_SSA_DCE
);
2691 /* Convert from SSA form. */
2693 timevar_push (TV_FROM_SSA
);
2694 open_dump_file (DFI_ussa
, decl
);
2696 convert_from_ssa ();
2697 /* New registers have been created. Rescan their usage. */
2698 reg_scan (insns
, max_reg_num (), 1);
2700 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2701 timevar_pop (TV_FROM_SSA
);
2704 /* CFG is no longer maintained up-to-date. */
2705 free_bb_for_insn ();
2708 timevar_push (TV_JUMP
);
2712 open_dump_file (DFI_null
, decl
);
2713 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2715 dump_flow_info (rtl_dump_file
);
2716 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2718 /* Try to identify useless null pointer tests and delete them. */
2719 if (flag_delete_null_pointer_checks
)
2720 delete_null_pointer_checks (insns
);
2722 timevar_push (TV_IFCVT
);
2724 timevar_pop (TV_IFCVT
);
2725 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2726 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2729 /* Jump optimization, and the removal of NULL pointer checks, may
2730 have reduced the number of instructions substantially. CSE, and
2731 future passes, allocate arrays whose dimensions involve the
2732 maximum instruction UID, so if we can reduce the maximum UID
2733 we'll save big on memory. */
2734 renumber_insns (rtl_dump_file
);
2736 compute_bb_for_insn (get_max_uid ());
2737 timevar_pop (TV_JUMP
);
2739 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
2743 /* Perform common subexpression elimination.
2744 Nonzero value from `cse_main' means that jumps were simplified
2745 and some code may now be unreachable, so do
2746 jump optimization again. */
2750 open_dump_file (DFI_cse
, decl
);
2752 dump_flow_info (rtl_dump_file
);
2753 timevar_push (TV_CSE
);
2755 reg_scan (insns
, max_reg_num (), 1);
2757 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2759 rebuild_jump_labels (insns
);
2760 purge_all_dead_edges (0);
2762 delete_trivially_dead_insns (insns
, max_reg_num ());
2764 /* If we are not running more CSE passes, then we are no longer
2765 expecting CSE to be run. But always rerun it in a cheap mode. */
2766 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2768 if (tem
|| optimize
> 1)
2769 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2770 /* Try to identify useless null pointer tests and delete them. */
2771 if (flag_delete_null_pointer_checks
|| flag_thread_jumps
)
2773 timevar_push (TV_JUMP
);
2775 if (flag_delete_null_pointer_checks
)
2776 delete_null_pointer_checks (insns
);
2777 /* CFG is no longer maintained up-to-date. */
2778 timevar_pop (TV_JUMP
);
2781 /* The second pass of jump optimization is likely to have
2782 removed a bunch more instructions. */
2783 renumber_insns (rtl_dump_file
);
2784 compute_bb_for_insn (get_max_uid ());
2786 timevar_pop (TV_CSE
);
2787 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2790 open_dump_file (DFI_addressof
, decl
);
2792 purge_addressof (insns
);
2794 purge_all_dead_edges (0);
2795 reg_scan (insns
, max_reg_num (), 1);
2797 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2801 /* Perform global cse. */
2803 if (optimize
> 0 && flag_gcse
)
2805 int save_csb
, save_cfj
;
2808 timevar_push (TV_GCSE
);
2809 open_dump_file (DFI_gcse
, decl
);
2811 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2812 tem
= gcse_main (insns
, rtl_dump_file
);
2813 rebuild_jump_labels (insns
);
2814 delete_trivially_dead_insns (insns
, max_reg_num ());
2816 save_csb
= flag_cse_skip_blocks
;
2817 save_cfj
= flag_cse_follow_jumps
;
2818 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2820 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2822 if (flag_expensive_optimizations
)
2824 timevar_push (TV_CSE
);
2825 reg_scan (insns
, max_reg_num (), 1);
2826 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2827 purge_all_dead_edges (0);
2828 delete_trivially_dead_insns (insns
, max_reg_num ());
2829 timevar_pop (TV_CSE
);
2830 cse_not_expected
= !flag_rerun_cse_after_loop
;
2833 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2834 things up. Then possibly re-run CSE again. */
2838 timevar_push (TV_JUMP
);
2839 rebuild_jump_labels (insns
);
2840 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2841 timevar_pop (TV_JUMP
);
2843 if (flag_expensive_optimizations
)
2845 timevar_push (TV_CSE
);
2846 reg_scan (insns
, max_reg_num (), 1);
2847 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2848 purge_all_dead_edges (0);
2849 delete_trivially_dead_insns (insns
, max_reg_num ());
2850 timevar_pop (TV_CSE
);
2854 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2855 timevar_pop (TV_GCSE
);
2858 flag_cse_skip_blocks
= save_csb
;
2859 flag_cse_follow_jumps
= save_cfj
;
2860 #ifdef ENABLE_CHECKING
2861 verify_flow_info ();
2865 /* Move constant computations out of loops. */
2869 timevar_push (TV_LOOP
);
2870 delete_dead_jumptables ();
2871 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2872 open_dump_file (DFI_loop
, decl
);
2873 /* CFG is no longer maintained up-to-date. */
2874 free_bb_for_insn ();
2876 if (flag_rerun_loop_opt
)
2878 cleanup_barriers ();
2880 /* We only want to perform unrolling once. */
2882 loop_optimize (insns
, rtl_dump_file
, 0);
2884 /* The first call to loop_optimize makes some instructions
2885 trivially dead. We delete those instructions now in the
2886 hope that doing so will make the heuristics in loop work
2887 better and possibly speed up compilation. */
2888 delete_trivially_dead_insns (insns
, max_reg_num ());
2890 /* The regscan pass is currently necessary as the alias
2891 analysis code depends on this information. */
2892 reg_scan (insns
, max_reg_num (), 1);
2894 cleanup_barriers ();
2895 loop_optimize (insns
, rtl_dump_file
,
2896 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
2897 | (flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0));
2899 /* Loop can create trivially dead instructions. */
2900 delete_trivially_dead_insns (insns
, max_reg_num ());
2901 close_dump_file (DFI_loop
, print_rtl
, insns
);
2902 timevar_pop (TV_LOOP
);
2907 /* Do control and data flow analysis; wrote some of the results to
2910 timevar_push (TV_FLOW
);
2911 open_dump_file (DFI_cfg
, decl
);
2913 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2915 dump_flow_info (rtl_dump_file
);
2916 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0)
2917 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2919 /* It may make more sense to mark constant functions after dead code is
2920 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2921 may insert code making function non-constant, but we still must consider
2922 it as constant, otherwise -fbranch-probabilities will not read data back.
2924 life_analyzis rarely eliminates modification of external memory.
2926 mark_constant_function ();
2928 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2930 /* Do branch profiling and static profile estimation passes. */
2931 if (optimize
> 0 || profile_arc_flag
|| flag_test_coverage
2932 || flag_branch_probabilities
)
2936 timevar_push (TV_BRANCH_PROB
);
2937 open_dump_file (DFI_bp
, decl
);
2938 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2941 /* Discover and record the loop depth at the head of each basic
2942 block. The loop infrastructure does the real job for us. */
2943 flow_loops_find (&loops
, LOOP_TREE
);
2945 /* Estimate using heuristics if no profiling info is available. */
2946 if (flag_guess_branch_prob
)
2947 estimate_probability (&loops
);
2950 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2952 flow_loops_free (&loops
);
2953 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2954 timevar_pop (TV_BRANCH_PROB
);
2959 timevar_push (TV_CSE2
);
2960 open_dump_file (DFI_cse2
, decl
);
2962 dump_flow_info (rtl_dump_file
);
2964 if (flag_rerun_cse_after_loop
)
2966 timevar_push (TV_JUMP
);
2968 reg_scan (insns
, max_reg_num (), 0);
2970 timevar_push (TV_IFCVT
);
2971 cleanup_cfg (CLEANUP_EXPENSIVE
);
2973 timevar_pop(TV_IFCVT
);
2975 timevar_pop (TV_JUMP
);
2976 /* CFG is no longer maintained up-to-date. */
2977 reg_scan (insns
, max_reg_num (), 0);
2978 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
2979 purge_all_dead_edges (0);
2980 delete_trivially_dead_insns (insns
, max_reg_num ());
2984 timevar_push (TV_JUMP
);
2985 rebuild_jump_labels (insns
);
2986 cleanup_cfg (CLEANUP_EXPENSIVE
);
2987 timevar_pop (TV_JUMP
);
2991 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
2992 timevar_pop (TV_CSE2
);
2997 cse_not_expected
= 1;
2999 open_dump_file (DFI_life
, decl
);
3002 check_function_return_warnings ();
3004 #ifdef ENABLE_CHECKING
3005 verify_flow_info ();
3007 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3009 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
3010 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3011 timevar_pop (TV_FLOW
);
3015 if (warn_uninitialized
|| extra_warnings
)
3017 uninitialized_vars_warning (DECL_INITIAL (decl
));
3019 setjmp_args_warning ();
3025 if (initialize_uninitialized_subregs ())
3027 /* Insns were inserted, so things might look a bit different. */
3028 insns
= get_insns ();
3029 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES
,
3030 PROP_LOG_LINKS
| PROP_REG_INFO
3031 | PROP_DEATH_NOTES
);
3035 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3039 /* If -opt, try combining insns through substitution. */
3043 int rebuild_jump_labels_after_combine
= 0;
3045 timevar_push (TV_COMBINE
);
3046 open_dump_file (DFI_combine
, decl
);
3048 rebuild_jump_labels_after_combine
3049 = combine_instructions (insns
, max_reg_num ());
3051 /* Combining insns may have turned an indirect jump into a
3052 direct jump. Rebuid the JUMP_LABEL fields of jumping
3054 if (rebuild_jump_labels_after_combine
)
3056 timevar_push (TV_JUMP
);
3057 rebuild_jump_labels (insns
);
3058 timevar_pop (TV_JUMP
);
3060 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3063 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3064 timevar_pop (TV_COMBINE
);
3069 /* Rerun if-conversion, as combine may have simplified things enough to
3070 now meet sequence length restrictions. */
3073 timevar_push (TV_IFCVT
);
3074 open_dump_file (DFI_ce
, decl
);
3080 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3081 timevar_pop (TV_IFCVT
);
3084 /* Register allocation pre-pass, to reduce number of moves
3085 necessary for two-address machines. */
3086 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3088 timevar_push (TV_REGMOVE
);
3089 open_dump_file (DFI_regmove
, decl
);
3091 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3093 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3094 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3095 timevar_pop (TV_REGMOVE
);
3100 /* Do unconditional splitting before register allocation to allow machine
3101 description to add extra information not needed previously. */
3102 split_all_insns (1);
3104 /* Any of the several passes since flow1 will have munged register
3105 lifetime data a bit. */
3106 register_life_up_to_date
= 0;
3108 #ifdef OPTIMIZE_MODE_SWITCHING
3109 timevar_push (TV_MODE_SWITCH
);
3112 optimize_mode_switching (NULL
);
3115 timevar_pop (TV_MODE_SWITCH
);
3118 timevar_push (TV_SCHED
);
3120 #ifdef INSN_SCHEDULING
3122 /* Print function header into sched dump now
3123 because doing the sched analysis makes some of the dump. */
3124 if (optimize
> 0 && flag_schedule_insns
)
3126 open_dump_file (DFI_sched
, decl
);
3128 /* Do control and data sched analysis,
3129 and write some of the results to dump file. */
3131 schedule_insns (rtl_dump_file
);
3133 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3135 /* Register lifetime information was updated as part of verifying
3137 register_life_up_to_date
= 1;
3140 timevar_pop (TV_SCHED
);
3144 /* Determine if the current function is a leaf before running reload
3145 since this can impact optimizations done by the prologue and
3146 epilogue thus changing register elimination offsets. */
3147 current_function_is_leaf
= leaf_function_p ();
3149 timevar_push (TV_LOCAL_ALLOC
);
3150 open_dump_file (DFI_lreg
, decl
);
3152 /* Allocate pseudo-regs that are used only within 1 basic block.
3154 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3155 jump optimizer after register allocation and reloading are finished. */
3157 if (! register_life_up_to_date
)
3158 recompute_reg_usage (insns
, ! optimize_size
);
3160 /* Allocate the reg_renumber array. */
3161 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3163 /* And the reg_equiv_memory_loc array. */
3164 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3166 allocate_initial_values (reg_equiv_memory_loc
);
3168 regclass (insns
, max_reg_num (), rtl_dump_file
);
3169 rebuild_label_notes_after_reload
= local_alloc ();
3171 timevar_pop (TV_LOCAL_ALLOC
);
3173 if (dump_file
[DFI_lreg
].enabled
)
3175 timevar_push (TV_DUMP
);
3177 dump_flow_info (rtl_dump_file
);
3178 dump_local_alloc (rtl_dump_file
);
3180 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3181 timevar_pop (TV_DUMP
);
3186 timevar_push (TV_GLOBAL_ALLOC
);
3187 open_dump_file (DFI_greg
, decl
);
3189 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3190 pass fixing up any insns that are invalid. */
3193 failure
= global_alloc (rtl_dump_file
);
3196 build_insn_chain (insns
);
3197 failure
= reload (insns
, 0);
3200 timevar_pop (TV_GLOBAL_ALLOC
);
3202 if (dump_file
[DFI_greg
].enabled
)
3204 timevar_push (TV_DUMP
);
3206 dump_global_regs (rtl_dump_file
);
3208 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3209 timevar_pop (TV_DUMP
);
3213 goto exit_rest_of_compilation
;
3217 open_dump_file (DFI_postreload
, decl
);
3219 /* Do a very simple CSE pass over just the hard registers. */
3222 timevar_push (TV_RELOAD_CSE_REGS
);
3223 reload_cse_regs (insns
);
3224 timevar_pop (TV_RELOAD_CSE_REGS
);
3227 /* Register allocation and reloading may have turned an indirect jump into
3228 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3229 jumping instructions. */
3230 if (rebuild_label_notes_after_reload
)
3232 timevar_push (TV_JUMP
);
3234 rebuild_jump_labels (insns
);
3235 purge_all_dead_edges (0);
3237 timevar_pop (TV_JUMP
);
3240 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3242 /* Re-create the death notes which were deleted during reload. */
3243 timevar_push (TV_FLOW2
);
3244 open_dump_file (DFI_flow2
, decl
);
3246 #ifdef ENABLE_CHECKING
3247 verify_flow_info ();
3250 /* If optimizing, then go ahead and split insns now. */
3252 split_all_insns (0);
3254 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3256 /* On some machines, the prologue and epilogue code, or parts thereof,
3257 can be represented as RTL. Doing so lets us schedule insns between
3258 it and the rest of the code and also allows delayed branch
3259 scheduling to operate in the epilogue. */
3260 thread_prologue_and_epilogue_insns (insns
);
3264 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3265 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_CROSSJUMP
| CLEANUP_UPDATE_LIFE
);
3267 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3268 even for machines with possibly nonzero RETURN_POPS_ARGS
3269 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3270 push instructions will have popping returns. */
3271 #ifndef PUSH_ROUNDING
3272 if (!ACCUMULATE_OUTGOING_ARGS
)
3274 combine_stack_adjustments ();
3279 flow2_completed
= 1;
3281 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3282 timevar_pop (TV_FLOW2
);
3284 #ifdef HAVE_peephole2
3285 if (optimize
> 0 && flag_peephole2
)
3287 timevar_push (TV_PEEPHOLE2
);
3288 open_dump_file (DFI_peephole2
, decl
);
3290 peephole2_optimize (rtl_dump_file
);
3292 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3293 timevar_pop (TV_PEEPHOLE2
);
3297 if (flag_rename_registers
|| flag_cprop_registers
)
3299 timevar_push (TV_RENAME_REGISTERS
);
3300 open_dump_file (DFI_rnreg
, decl
);
3302 if (flag_rename_registers
)
3303 regrename_optimize ();
3304 if (flag_cprop_registers
)
3305 copyprop_hardreg_forward ();
3307 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3308 timevar_pop (TV_RENAME_REGISTERS
);
3313 timevar_push (TV_IFCVT2
);
3314 open_dump_file (DFI_ce2
, decl
);
3318 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3319 timevar_pop (TV_IFCVT2
);
3323 split_all_insns (1);
3326 #ifdef INSN_SCHEDULING
3327 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3329 timevar_push (TV_SCHED2
);
3330 open_dump_file (DFI_sched2
, decl
);
3332 /* Do control and data sched analysis again,
3333 and write some more of the results to dump file. */
3335 split_all_insns (1);
3337 schedule_insns (rtl_dump_file
);
3339 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3340 timevar_pop (TV_SCHED2
);
3346 #ifdef LEAF_REGISTERS
3347 current_function_uses_only_leaf_regs
3348 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3352 timevar_push (TV_REG_STACK
);
3353 open_dump_file (DFI_stack
, decl
);
3355 reg_to_stack (insns
, rtl_dump_file
);
3357 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3358 timevar_pop (TV_REG_STACK
);
3364 timevar_push (TV_REORDER_BLOCKS
);
3365 open_dump_file (DFI_bbro
, decl
);
3367 /* Last attempt to optimize CFG, as scheduling, peepholing
3368 and insn splitting possibly introduced more crossjumping
3370 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3371 | CLEANUP_CROSSJUMP
);
3372 if (flag_reorder_blocks
)
3374 reorder_basic_blocks ();
3375 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3378 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3379 timevar_pop (TV_REORDER_BLOCKS
);
3381 compute_alignments ();
3383 /* CFG is no longer maintained up-to-date. */
3384 free_bb_for_insn ();
3386 /* If a machine dependent reorganization is needed, call it. */
3387 #ifdef MACHINE_DEPENDENT_REORG
3388 timevar_push (TV_MACH_DEP
);
3389 open_dump_file (DFI_mach
, decl
);
3391 MACHINE_DEPENDENT_REORG (insns
);
3393 close_dump_file (DFI_mach
, print_rtl
, insns
);
3394 timevar_pop (TV_MACH_DEP
);
3399 purge_line_number_notes (insns
);
3400 cleanup_barriers ();
3402 /* If a scheduling pass for delayed branches is to be done,
3403 call the scheduling code. */
3406 if (optimize
> 0 && flag_delayed_branch
)
3408 timevar_push (TV_DBR_SCHED
);
3409 open_dump_file (DFI_dbr
, decl
);
3411 dbr_schedule (insns
, rtl_dump_file
);
3413 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3414 timevar_pop (TV_DBR_SCHED
);
3420 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3421 timevar_push (TV_SHORTEN_BRANCH
);
3422 split_all_insns_noflow ();
3423 timevar_pop (TV_SHORTEN_BRANCH
);
3426 convert_to_eh_region_ranges ();
3428 /* Shorten branches. */
3429 timevar_push (TV_SHORTEN_BRANCH
);
3430 shorten_branches (get_insns ());
3431 timevar_pop (TV_SHORTEN_BRANCH
);
3433 current_function_nothrow
= nothrow_function_p ();
3434 if (current_function_nothrow
)
3435 /* Now we know that this can't throw; set the flag for the benefit
3436 of other functions later in this translation unit. */
3437 TREE_NOTHROW (current_function_decl
) = 1;
3439 /* Now turn the rtl into assembler code. */
3441 timevar_push (TV_FINAL
);
3446 /* Get the function's name, as described by its RTL. This may be
3447 different from the DECL_NAME name used in the source file. */
3449 x
= DECL_RTL (decl
);
3450 if (GET_CODE (x
) != MEM
)
3453 if (GET_CODE (x
) != SYMBOL_REF
)
3455 fnname
= XSTR (x
, 0);
3457 assemble_start_function (decl
, fnname
);
3458 final_start_function (insns
, asm_out_file
, optimize
);
3459 final (insns
, asm_out_file
, optimize
, 0);
3460 final_end_function ();
3462 #ifdef IA64_UNWIND_INFO
3463 /* ??? The IA-64 ".handlerdata" directive must be issued before
3464 the ".endp" directive that closes the procedure descriptor. */
3465 output_function_exception_table ();
3468 assemble_end_function (decl
, fnname
);
3470 #ifndef IA64_UNWIND_INFO
3471 /* Otherwise, it feels unclean to switch sections in the middle. */
3472 output_function_exception_table ();
3476 fflush (asm_out_file
);
3478 /* Release all memory allocated by flow. */
3479 free_basic_block_vars (0);
3481 /* Release all memory held by regsets now. */
3482 regset_release_memory ();
3484 timevar_pop (TV_FINAL
);
3488 /* Write DBX symbols if requested. */
3490 /* Note that for those inline functions where we don't initially
3491 know for certain that we will be generating an out-of-line copy,
3492 the first invocation of this routine (rest_of_compilation) will
3493 skip over this code by doing a `goto exit_rest_of_compilation;'.
3494 Later on, finish_compilation will call rest_of_compilation again
3495 for those inline functions that need to have out-of-line copies
3496 generated. During that call, we *will* be routed past here. */
3498 timevar_push (TV_SYMOUT
);
3499 (*debug_hooks
->function_decl
) (decl
);
3500 timevar_pop (TV_SYMOUT
);
3502 exit_rest_of_compilation
:
3504 /* In case the function was not output,
3505 don't leave any temporary anonymous types
3506 queued up for sdb output. */
3507 #ifdef SDB_DEBUGGING_INFO
3508 if (write_symbols
== SDB_DEBUG
)
3509 sdbout_types (NULL_TREE
);
3512 reload_completed
= 0;
3513 flow2_completed
= 0;
3516 timevar_push (TV_FINAL
);
3518 /* Clear out the insn_length contents now that they are no
3520 init_insn_lengths ();
3522 /* Clear out the real_constant_chain before some of the rtx's
3523 it runs through become garbage. */
3524 clear_const_double_mem ();
3526 /* Show no temporary slots allocated. */
3529 free_basic_block_vars (0);
3530 free_bb_for_insn ();
3532 timevar_pop (TV_FINAL
);
3534 /* Make sure volatile mem refs aren't considered valid operands for
3535 arithmetic insns. We must call this here if this is a nested inline
3536 function, since the above code leaves us in the init_recog state
3537 (from final.c), and the function context push/pop code does not
3538 save/restore volatile_ok.
3540 ??? Maybe it isn't necessary for expand_start_function to call this
3541 anymore if we do it here? */
3543 init_recog_no_volatile ();
3545 /* We're done with this function. Free up memory if we can. */
3546 free_after_parsing (cfun
);
3547 if (! DECL_DEFER_OUTPUT (decl
))
3549 free_after_compilation (cfun
);
3551 /* Clear integrate.c's pointer to the cfun structure we just
3553 DECL_SAVED_INSNS (decl
) = 0;
3559 timevar_pop (TV_REST_OF_COMPILATION
);
3569 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3570 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3571 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3572 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3573 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3574 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"));
3576 for (i
= ARRAY_SIZE (f_options
); i
--;)
3578 const char *description
= f_options
[i
].description
;
3580 if (description
!= NULL
&& * description
!= 0)
3581 printf (" -f%-21s %s\n",
3582 f_options
[i
].string
, _(description
));
3585 printf (_(" -O[number] Set optimization level to [number]\n"));
3586 printf (_(" -Os Optimize for space rather than speed\n"));
3587 for (i
= LAST_PARAM
; i
--;)
3589 const char *description
= compiler_params
[i
].help
;
3590 const int length
= 21-strlen(compiler_params
[i
].option
);
3592 if (description
!= NULL
&& * description
!= 0)
3593 printf (" --param %s=<value>%.*s%s\n",
3594 compiler_params
[i
].option
,
3595 length
> 0 ? length
: 1, " ",
3598 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3599 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3600 printf (_(" -w Suppress warnings\n"));
3601 printf (_(" -W Enable extra warnings\n"));
3603 for (i
= ARRAY_SIZE (W_options
); i
--;)
3605 const char *description
= W_options
[i
].description
;
3607 if (description
!= NULL
&& * description
!= 0)
3608 printf (" -W%-21s %s\n",
3609 W_options
[i
].string
, _(description
));
3612 printf (_(" -Wunused Enable unused warnings\n"));
3613 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3614 printf (_(" -p Enable function profiling\n"));
3615 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3616 printf (_(" -a Enable block profiling \n"));
3618 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3619 printf (_(" -ax Enable jump profiling \n"));
3621 printf (_(" -o <file> Place output into <file> \n"));
3623 -G <number> Put global and static data smaller than <number>\n\
3624 bytes into a special section (on some targets)\n"));
3626 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3628 if (debug_args
[i
].description
!= NULL
)
3629 printf (" -g%-21s %s\n",
3630 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3633 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3634 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3635 printf (_(" -version Display the compiler's version\n"));
3636 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3637 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3638 #if defined INSN_SCHEDULING
3639 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3641 printf (_(" --help Display this information\n"));
3646 /* Display descriptions of language specific options.
3647 If there is no description, note that there is an undocumented option.
3648 If the description is empty, do not display anything. (This allows
3649 options to be deliberately undocumented, for whatever reason).
3650 If the option string is missing, then this is a marker, indicating
3651 that the description string is in fact the name of a language, whose
3652 language specific options are to follow. */
3654 if (ARRAY_SIZE (documented_lang_options
) > 1)
3656 printf (_("\nLanguage specific options:\n"));
3658 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3660 const char *description
= documented_lang_options
[i
].description
;
3661 const char *option
= documented_lang_options
[i
].option
;
3663 if (description
== NULL
)
3668 printf (_(" %-23.23s [undocumented]\n"), option
);
3670 else if (*description
== 0)
3672 else if (option
== NULL
)
3676 (_("\nThere are undocumented %s specific options as well.\n"),
3680 printf (_("\n Options for %s:\n"), description
);
3685 printf (" %-23.23s %s\n", option
, _(description
));
3690 printf (_("\nThere are undocumented %s specific options as well.\n"),
3693 display_target_options ();
3697 display_target_options ()
3700 static bool displayed
= false;
3702 /* Avoid double printing for --help --target-help. */
3707 if (ARRAY_SIZE (target_switches
) > 1
3708 #ifdef TARGET_OPTIONS
3709 || ARRAY_SIZE (target_options
) > 1
3717 printf (_("\nTarget specific options:\n"));
3719 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3721 const char *option
= target_switches
[i
].name
;
3722 const char *description
= target_switches
[i
].description
;
3724 if (option
== NULL
|| *option
== 0)
3726 else if (description
== NULL
)
3731 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3733 else if (* description
!= 0)
3734 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3737 #ifdef TARGET_OPTIONS
3738 for (i
= ARRAY_SIZE (target_options
); i
--;)
3740 const char *option
= target_options
[i
].prefix
;
3741 const char *description
= target_options
[i
].description
;
3743 if (option
== NULL
|| *option
== 0)
3745 else if (description
== NULL
)
3750 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3752 else if (* description
!= 0)
3753 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3759 printf (_("\nThere are undocumented target specific options as well.\n"));
3761 printf (_(" They exist, but they are not documented.\n"));
3766 /* Parse a -d... command line switch. */
3769 decode_d_option (arg
)
3778 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3779 dump_file
[i
].enabled
= 1;
3785 flag_print_asm_name
= 1;
3788 flag_dump_rtl_in_asm
= 1;
3789 flag_print_asm_name
= 1;
3792 graph_dump_format
= vcg
;
3795 rtl_dump_and_exit
= 1;
3798 (*lang_hooks
.set_yydebug
) (1);
3800 case 'D': /* These are handled by the preprocessor. */
3806 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3807 if (c
== dump_file
[i
].debug_switch
)
3809 dump_file
[i
].enabled
= 1;
3814 warning ("unrecognized gcc debugging option: %c", c
);
3819 /* Parse a -f... command line switch. ARG is the value after the -f.
3820 It is safe to access 'ARG - 2' to generate the full switch name.
3821 Return the number of strings consumed. */
3824 decode_f_option (arg
)
3828 const char *option_value
= NULL
;
3830 /* Search for the option in the table of binary f options. */
3831 for (j
= ARRAY_SIZE (f_options
); j
--;)
3833 if (!strcmp (arg
, f_options
[j
].string
))
3835 *f_options
[j
].variable
= f_options
[j
].on_value
;
3839 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3840 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3842 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3847 if (!strcmp (arg
, "fast-math"))
3848 set_fast_math_flags ();
3849 else if (!strcmp (arg
, "no-fast-math"))
3850 set_no_fast_math_flags ();
3851 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3852 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3855 read_integral_parameter (option_value
, arg
- 2,
3857 set_param_value ("max-inline-insns", val
);
3859 #ifdef INSN_SCHEDULING
3860 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3861 fix_sched_param ("verbose", option_value
);
3863 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3864 fix_register (option_value
, 1, 1);
3865 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3866 fix_register (option_value
, 0, 1);
3867 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3868 fix_register (option_value
, 0, 0);
3869 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3870 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3871 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3873 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3874 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3875 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3876 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3878 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3879 else if ((option_value
3880 = skip_leading_substring (arg
, "stack-limit-register=")))
3882 int reg
= decode_reg_name (option_value
);
3884 error ("unrecognized register name `%s'", option_value
);
3886 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3888 else if ((option_value
3889 = skip_leading_substring (arg
, "stack-limit-symbol=")))
3892 nm
= ggc_strdup (option_value
);
3893 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
3895 else if ((option_value
3896 = skip_leading_substring (arg
, "message-length=")))
3897 output_set_maximum_length
3898 (&global_dc
->buffer
, read_integral_parameter
3899 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
3900 else if ((option_value
3901 = skip_leading_substring (arg
, "diagnostics-show-location=")))
3903 if (!strcmp (option_value
, "once"))
3904 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
3905 else if (!strcmp (option_value
, "every-line"))
3906 diagnostic_prefixing_rule (global_dc
)
3907 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
3909 error ("unrecognized option `%s'", arg
- 2);
3911 else if (!strcmp (arg
, "no-stack-limit"))
3912 stack_limit_rtx
= NULL_RTX
;
3913 else if (!strcmp (arg
, "preprocessed"))
3914 /* Recognise this switch but do nothing. This prevents warnings
3915 about an unrecognized switch if cpplib has not been linked in. */
3923 /* Parse a -W... command line switch. ARG is the value after the -W.
3924 It is safe to access 'ARG - 2' to generate the full switch name.
3925 Return the number of strings consumed. */
3928 decode_W_option (arg
)
3931 const char *option_value
= NULL
;
3934 /* Search for the option in the table of binary W options. */
3936 for (j
= ARRAY_SIZE (W_options
); j
--;)
3938 if (!strcmp (arg
, W_options
[j
].string
))
3940 *W_options
[j
].variable
= W_options
[j
].on_value
;
3944 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3945 && ! strcmp (arg
+ 3, W_options
[j
].string
))
3947 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
3952 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
3953 warning ("-Wid-clash-LEN is no longer supported");
3954 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
3956 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
3958 warn_larger_than
= larger_than_size
!= -1;
3960 else if (!strcmp (arg
, "unused"))
3964 else if (!strcmp (arg
, "no-unused"))
3974 /* Parse a -g... command line switch. ARG is the value after the -g.
3975 It is safe to access 'ARG - 2' to generate the full switch name.
3976 Return the number of strings consumed. */
3979 decode_g_option (arg
)
3982 static unsigned level
=0;
3983 /* A lot of code assumes write_symbols == NO_DEBUG if the
3984 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3985 of what debugging type has been selected). This records the
3986 selected type. It is an error to specify more than one
3988 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
3989 /* Non-zero if debugging format has been explicitly set.
3990 -g and -ggdb don't explicitly set the debugging format so
3991 -gdwarf -g3 is equivalent to -gdwarf3. */
3992 static int type_explicitly_set_p
= 0;
3993 /* Indexed by enum debug_info_type. */
3994 static const char *const debug_type_names
[] =
3996 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3999 /* The maximum admissible debug level value. */
4000 static const unsigned max_debug_level
= 3;
4002 /* Look up ARG in the table. */
4003 for (da
= debug_args
; da
->arg
; da
++)
4005 const int da_len
= strlen (da
->arg
);
4007 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4009 enum debug_info_type type
= da
->debug_type
;
4010 const char *p
= arg
+ da_len
;
4012 if (*p
&& ! ISDIGIT (*p
))
4015 /* A debug flag without a level defaults to level 2.
4016 Note we do not want to call read_integral_parameter
4017 for that case since it will call atoi which
4020 ??? We may want to generalize the interface to
4021 read_integral_parameter to better handle this case
4022 if this case shows up often. */
4024 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4026 level
= (level
== 0) ? 2 : level
;
4028 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4030 error ("use -gdwarf -g%d for DWARF v1, level %d",
4033 error ("use -gdwarf-2 for DWARF v2");
4036 if (level
> max_debug_level
)
4039 ignoring option `%s' due to invalid debug level specification",
4041 level
= debug_info_level
;
4044 if (type
== NO_DEBUG
)
4046 type
= PREFERRED_DEBUGGING_TYPE
;
4048 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4050 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4051 type
= DWARF2_DEBUG
;
4053 #ifdef DBX_DEBUGGING_INFO
4060 if (type
== NO_DEBUG
)
4061 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4063 /* Does it conflict with an already selected type? */
4064 if (type_explicitly_set_p
4065 /* -g/-ggdb don't conflict with anything. */
4066 && da
->debug_type
!= NO_DEBUG
4067 && type
!= selected_debug_type
)
4068 warning ("`%s' ignored, conflicts with `-g%s'",
4069 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4072 /* If the format has already been set, -g/-ggdb
4073 only change the debug level. */
4074 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4075 /* Don't change debugging type. */
4079 selected_debug_type
= type
;
4080 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4083 write_symbols
= (level
== 0
4085 : selected_debug_type
);
4086 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4087 debug_info_level
= (enum debug_info_level
) level
;
4100 /* Decode the first argument in the argv as a language-independent option.
4101 Return the number of strings consumed. */
4104 independent_decode_option (argc
, argv
)
4108 char *arg
= argv
[0];
4110 if (arg
[0] != '-' || arg
[1] == 0)
4122 if (!strcmp (arg
, "-help"))
4125 exit_after_options
= 1;
4128 if (!strcmp (arg
, "-target-help"))
4130 display_target_options ();
4131 exit_after_options
= 1;
4134 if (!strcmp (arg
, "-version"))
4136 print_version (stderr
, "");
4137 exit_after_options
= 1;
4140 /* Handle '--param <name>=<value>'. */
4141 if (strcmp (arg
, "-param") == 0)
4147 error ("-param option missing argument");
4151 /* Get the '<name>=<value>' parameter. */
4153 /* Look for the `='. */
4154 equal
= strchr (arg
, '=');
4156 error ("invalid --param option: %s", arg
);
4161 /* Zero out the `=' sign so that we get two separate strings. */
4163 /* Figure out what value is specified. */
4164 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4165 if (val
!= INVALID_PARAM_VAL
)
4166 set_param_value (arg
, val
);
4168 error ("invalid parameter value `%s'", equal
+ 1);
4183 /* Already been treated in main (). Do nothing. */
4187 set_target_switch (arg
+ 1);
4191 return decode_f_option (arg
+ 1);
4194 return decode_g_option (arg
+ 1);
4197 if (!strcmp (arg
, "dumpbase"))
4202 dump_base_name
= argv
[1];
4206 decode_d_option (arg
+ 1);
4210 if (!strcmp (arg
, "pedantic"))
4212 else if (!strcmp (arg
, "pedantic-errors"))
4213 flag_pedantic_errors
= pedantic
= 1;
4214 else if (arg
[1] == 0)
4221 if (!strcmp (arg
, "quiet"))
4228 if (!strcmp (arg
, "version"))
4236 inhibit_warnings
= 1;
4245 /* We save the value of warn_uninitialized, since if they put
4246 -Wuninitialized on the command line, we need to generate a
4247 warning about not using it without also specifying -O. */
4248 if (warn_uninitialized
!= 1)
4249 warn_uninitialized
= 2;
4252 return decode_W_option (arg
+ 1);
4256 if (!strncmp (arg
, "aux-info", 8))
4263 aux_info_file_name
= argv
[1];
4264 flag_gen_aux_info
= 1;
4267 else if (arg
[8] == '=')
4269 aux_info_file_name
= arg
+ 9;
4270 flag_gen_aux_info
= 1;
4285 asm_file_name
= argv
[1];
4300 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4305 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4309 if (g_switch_val
== -1)
4313 g_switch_set
= TRUE
;
4314 g_switch_value
= g_switch_val
;
4324 /* Decode -m switches. */
4325 /* Decode the switch -mNAME. */
4328 set_target_switch (name
)
4332 int valid_target_option
= 0;
4334 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4335 if (!strcmp (target_switches
[j
].name
, name
))
4337 if (target_switches
[j
].value
< 0)
4338 target_flags
&= ~-target_switches
[j
].value
;
4340 target_flags
|= target_switches
[j
].value
;
4341 valid_target_option
= 1;
4344 #ifdef TARGET_OPTIONS
4345 if (!valid_target_option
)
4346 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4348 int len
= strlen (target_options
[j
].prefix
);
4349 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4351 *target_options
[j
].variable
= name
+ len
;
4352 valid_target_option
= 1;
4357 if (!valid_target_option
)
4358 error ("invalid option `%s'", name
);
4361 /* Print version information to FILE.
4362 Each line begins with INDENT (for the case where FILE is the
4363 assembler output file). */
4366 print_version (file
, indent
)
4371 #define __VERSION__ "[?]"
4375 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4377 "%s%s%s version %s (%s) compiled by CC.\n"
4379 , indent
, *indent
!= 0 ? " " : "",
4380 lang_hooks
.name
, version_string
, TARGET_NAME
,
4381 indent
, __VERSION__
);
4384 /* Print an option value and return the adjusted position in the line.
4385 ??? We don't handle error returns from fprintf (disk full); presumably
4386 other code will catch a disk full though. */
4389 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4392 const char *indent
, *sep
, *term
, *type
, *name
;
4394 /* The ultrix fprintf returns 0 on success, so compute the result we want
4395 here since we need it for the following test. */
4396 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4401 fprintf (file
, "%s", term
);
4406 fprintf (file
, "%s", indent
);
4407 pos
= strlen (indent
);
4409 fprintf (file
, "%s%s%s", sep
, type
, name
);
4414 /* Print active target switches to FILE.
4415 POS is the current cursor position and MAX is the size of a "line".
4416 Each line begins with INDENT and ends with TERM.
4417 Each switch is separated from the next by SEP. */
4420 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4423 const char *indent
, *sep
, *term
;
4428 /* Print the options as passed. */
4430 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4431 _("options passed: "), "");
4433 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4437 if (strcmp (*p
, "-o") == 0)
4443 if (strcmp (*p
, "-quiet") == 0)
4445 if (strcmp (*p
, "-version") == 0)
4450 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4453 fprintf (file
, "%s", term
);
4455 /* Print the -f and -m options that have been enabled.
4456 We don't handle language specific options but printing argv
4459 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4460 _("options enabled: "), "");
4462 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4463 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4464 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4465 "-f", f_options
[j
].string
);
4467 /* Print target specific options. */
4469 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4470 if (target_switches
[j
].name
[0] != '\0'
4471 && target_switches
[j
].value
> 0
4472 && ((target_switches
[j
].value
& target_flags
)
4473 == target_switches
[j
].value
))
4475 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4476 "-m", target_switches
[j
].name
);
4479 #ifdef TARGET_OPTIONS
4480 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4481 if (*target_options
[j
].variable
!= NULL
)
4484 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4485 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4486 prefix
, *target_options
[j
].variable
);
4490 fprintf (file
, "%s", term
);
4493 /* Open assembly code output file. Do this even if -fsyntax-only is
4494 on, because then the driver will have provided the name of a
4495 temporary file or bit bucket for us. NAME is the file specified on
4496 the command line, possibly NULL. */
4498 init_asm_output (name
)
4501 if (name
== NULL
&& asm_file_name
== 0)
4502 asm_out_file
= stdout
;
4505 if (asm_file_name
== 0)
4507 int len
= strlen (dump_base_name
);
4508 char *dumpname
= (char *) xmalloc (len
+ 6);
4509 memcpy (dumpname
, dump_base_name
, len
+ 1);
4510 strip_off_ending (dumpname
, len
);
4511 strcat (dumpname
, ".s");
4512 asm_file_name
= dumpname
;
4514 if (!strcmp (asm_file_name
, "-"))
4515 asm_out_file
= stdout
;
4517 asm_out_file
= fopen (asm_file_name
, "w");
4518 if (asm_out_file
== 0)
4519 fatal_io_error ("can't open %s for writing", asm_file_name
);
4522 #ifdef IO_BUFFER_SIZE
4523 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4524 _IOFBF
, IO_BUFFER_SIZE
);
4527 if (!flag_syntax_only
)
4529 #ifdef ASM_FILE_START
4530 ASM_FILE_START (asm_out_file
);
4533 #ifdef ASM_COMMENT_START
4534 if (flag_verbose_asm
)
4536 /* Print the list of options in effect. */
4537 print_version (asm_out_file
, ASM_COMMENT_START
);
4538 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4539 ASM_COMMENT_START
, " ", "\n");
4540 /* Add a blank line here so it appears in assembler output but not
4542 fprintf (asm_out_file
, "\n");
4548 /* Initialization of the front end environment, before command line
4549 options are parsed. Signal handlers, internationalization etc.
4550 ARGV0 is main's argv[0]. */
4552 general_init (argv0
)
4557 p
= argv0
+ strlen (argv0
);
4558 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4562 xmalloc_set_program_name (progname
);
4564 gcc_init_libintl ();
4566 /* Install handler for SIGFPE, which may be received while we do
4567 compile-time floating point arithmetic. */
4568 signal (SIGFPE
, float_signal
);
4570 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4572 signal (SIGSEGV
, crash_signal
);
4575 signal (SIGILL
, crash_signal
);
4578 signal (SIGBUS
, crash_signal
);
4581 signal (SIGABRT
, crash_signal
);
4583 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4584 signal (SIGIOT
, crash_signal
);
4587 /* Initialize the diagnostics reporting machinery, so option parsing
4588 can give warnings and errors. */
4589 diagnostic_initialize (global_dc
);
4592 /* Parse command line options and set default flag values, called
4593 after language-independent option-independent initialization. Do
4594 minimal options processing. Outputting diagnostics is OK, but GC
4595 and identifier hashtables etc. are not initialized yet. */
4597 parse_options_and_default_flags (argc
, argv
)
4603 /* Save in case md file wants to emit args as a comment. */
4607 /* Initialize register usage now so switches may override. */
4610 /* Register the language-independent parameters. */
4611 add_params (lang_independent_params
, LAST_PARAM
);
4613 /* Perform language-specific options initialization. */
4614 (*lang_hooks
.init_options
) ();
4616 /* Scan to see what optimization level has been specified. That will
4617 determine the default value of many flags. */
4618 for (i
= 1; i
< argc
; i
++)
4620 if (!strcmp (argv
[i
], "-O"))
4625 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4627 /* Handle -Os, -O2, -O3, -O69, ... */
4628 char *p
= &argv
[i
][2];
4630 if ((p
[0] == 's') && (p
[1] == 0))
4634 /* Optimizing for size forces optimize to be 2. */
4639 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4640 if (optimize_val
!= -1)
4642 optimize
= optimize_val
;
4651 flag_merge_constants
= 0;
4657 flag_thread_jumps
= 1;
4659 flag_delayed_branch
= 1;
4661 #ifdef CAN_DEBUG_WITHOUT_FP
4662 flag_omit_frame_pointer
= 1;
4664 flag_guess_branch_prob
= 1;
4665 flag_cprop_registers
= 1;
4670 flag_optimize_sibling_calls
= 1;
4671 flag_cse_follow_jumps
= 1;
4672 flag_cse_skip_blocks
= 1;
4674 flag_expensive_optimizations
= 1;
4675 flag_strength_reduce
= 1;
4676 flag_rerun_cse_after_loop
= 1;
4677 flag_rerun_loop_opt
= 1;
4678 flag_caller_saves
= 1;
4681 #ifdef INSN_SCHEDULING
4682 flag_schedule_insns
= 1;
4683 flag_schedule_insns_after_reload
= 1;
4686 flag_strict_aliasing
= 1;
4687 flag_delete_null_pointer_checks
= 1;
4688 flag_reorder_blocks
= 1;
4693 flag_inline_functions
= 1;
4694 flag_rename_registers
= 1;
4697 if (optimize
< 2 || optimize_size
)
4702 align_functions
= 1;
4705 /* Initialize whether `char' is signed. */
4706 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4707 #ifdef DEFAULT_SHORT_ENUMS
4708 /* Initialize how much space enums occupy, by default. */
4709 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4712 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4715 set_target_switch ("");
4717 /* Unwind tables are always present in an ABI-conformant IA-64
4718 object file, so the default should be ON. */
4719 #ifdef IA64_UNWIND_INFO
4720 flag_unwind_tables
= IA64_UNWIND_INFO
;
4723 #ifdef OPTIMIZATION_OPTIONS
4724 /* Allow default optimizations to be specified on a per-machine basis. */
4725 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4728 /* Perform normal command line switch decoding. */
4729 for (i
= 1; i
< argc
;)
4732 int indep_processed
;
4734 /* Give the language a chance to decode the option for itself. */
4735 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4737 if (lang_processed
>= 0)
4738 /* Now see if the option also has a language independent meaning.
4739 Some options are both language specific and language independent,
4741 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4744 lang_processed
= -lang_processed
;
4745 indep_processed
= 0;
4748 if (lang_processed
|| indep_processed
)
4749 i
+= MAX (lang_processed
, indep_processed
);
4752 const char *option
= NULL
;
4753 const char *lang
= NULL
;
4756 /* It is possible that the command line switch is not valid for the
4757 current language, but it is valid for another language. In order
4758 to be compatible with previous versions of the compiler (which
4759 did not issue an error message in this case) we check for this
4760 possibility here. If we do find a match, then if extra_warnings
4761 is set we generate a warning message, otherwise we will just
4762 ignore the option. */
4763 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4765 option
= documented_lang_options
[j
].option
;
4768 lang
= documented_lang_options
[j
].description
;
4769 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4773 if (j
!= ARRAY_SIZE (documented_lang_options
))
4777 warning ("ignoring command line option '%s'", argv
[i
]);
4780 ("(it is valid for %s but not the selected language)",
4784 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4785 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4787 error ("unrecognized option `%s'", argv
[i
]);
4793 /* Set flag_no_inline before the post_options () hook. The C front
4794 ends use it to determine tree inlining defaults. FIXME: such
4795 code should be lang-independent when all front ends use tree
4796 inlining, in which case it, and this condition, should be moved
4797 to the top of process_options() instead. */
4800 /* Inlining does not work if not optimizing,
4801 so force it not to be done. */
4805 /* The c_decode_option function and decode_option hook set
4806 this to `2' if -Wall is used, so we can avoid giving out
4807 lots of errors for people who don't realize what -Wall does. */
4808 if (warn_uninitialized
== 1)
4809 warning ("-Wuninitialized is not supported without -O");
4812 /* All command line options have been parsed; allow the front end to
4813 perform consistency checks, etc. */
4814 (*lang_hooks
.post_options
) ();
4817 /* Process the options that have been parsed. */
4821 #ifdef OVERRIDE_OPTIONS
4822 /* Some machines may reject certain combinations of options. */
4826 /* Set up the align_*_log variables, defaulting them to 1 if they
4827 were still unset. */
4828 if (align_loops
<= 0) align_loops
= 1;
4829 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4830 align_loops_max_skip
= align_loops
- 1;
4831 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4832 if (align_jumps
<= 0) align_jumps
= 1;
4833 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4834 align_jumps_max_skip
= align_jumps
- 1;
4835 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4836 if (align_labels
<= 0) align_labels
= 1;
4837 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4838 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4839 align_labels_max_skip
= align_labels
- 1;
4840 if (align_functions
<= 0) align_functions
= 1;
4841 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4843 /* Unrolling all loops implies that standard loop unrolling must also
4845 if (flag_unroll_all_loops
)
4846 flag_unroll_loops
= 1;
4847 /* Loop unrolling requires that strength_reduction be on also. Silently
4848 turn on strength reduction here if it isn't already on. Also, the loop
4849 unrolling code assumes that cse will be run after loop, so that must
4850 be turned on also. */
4851 if (flag_unroll_loops
)
4853 flag_strength_reduce
= 1;
4854 flag_rerun_cse_after_loop
= 1;
4857 if (flag_non_call_exceptions
)
4858 flag_asynchronous_unwind_tables
= 1;
4859 if (flag_asynchronous_unwind_tables
)
4860 flag_unwind_tables
= 1;
4862 /* Warn about options that are not supported on this machine. */
4863 #ifndef INSN_SCHEDULING
4864 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4865 warning ("instruction scheduling not supported on this target machine");
4868 if (flag_delayed_branch
)
4869 warning ("this target machine does not have delayed branches");
4872 /* Some operating systems do not allow profiling without a frame
4874 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4876 && flag_omit_frame_pointer
)
4878 error ("profiling does not work without a frame pointer");
4879 flag_omit_frame_pointer
= 0;
4882 user_label_prefix
= USER_LABEL_PREFIX
;
4883 if (flag_leading_underscore
!= -1)
4885 /* If the default prefix is more complicated than "" or "_",
4886 issue a warning and ignore this option. */
4887 if (user_label_prefix
[0] == 0 ||
4888 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4890 user_label_prefix
= flag_leading_underscore
? "_" : "";
4893 warning ("-f%sleading-underscore not supported on this target machine",
4894 flag_leading_underscore
? "" : "no-");
4897 /* If we are in verbose mode, write out the version and maybe all the
4898 option flags in use. */
4901 print_version (stderr
, "");
4903 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4909 if (flag_syntax_only
)
4911 write_symbols
= NO_DEBUG
;
4915 /* Now we know write_symbols, set up the debug hooks based on it.
4916 By default we do nothing for debug output. */
4917 #if defined(DBX_DEBUGGING_INFO)
4918 if (write_symbols
== DBX_DEBUG
)
4919 debug_hooks
= &dbx_debug_hooks
;
4921 #if defined(XCOFF_DEBUGGING_INFO)
4922 if (write_symbols
== XCOFF_DEBUG
)
4923 debug_hooks
= &xcoff_debug_hooks
;
4925 #ifdef SDB_DEBUGGING_INFO
4926 if (write_symbols
== SDB_DEBUG
)
4927 debug_hooks
= &sdb_debug_hooks
;
4929 #ifdef DWARF_DEBUGGING_INFO
4930 if (write_symbols
== DWARF_DEBUG
)
4931 debug_hooks
= &dwarf_debug_hooks
;
4933 #ifdef DWARF2_DEBUGGING_INFO
4934 if (write_symbols
== DWARF2_DEBUG
)
4935 debug_hooks
= &dwarf2_debug_hooks
;
4937 #ifdef VMS_DEBUGGING_INFO
4938 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4939 debug_hooks
= &vmsdbg_debug_hooks
;
4942 /* If auxiliary info generation is desired, open the output file.
4943 This goes in the same directory as the source file--unlike
4944 all the other output files. */
4945 if (flag_gen_aux_info
)
4947 aux_info_file
= fopen (aux_info_file_name
, "w");
4948 if (aux_info_file
== 0)
4949 fatal_io_error ("can't open %s", aux_info_file_name
);
4952 if (! targetm
.have_named_sections
)
4954 if (flag_function_sections
)
4956 warning ("-ffunction-sections not supported for this target");
4957 flag_function_sections
= 0;
4959 if (flag_data_sections
)
4961 warning ("-fdata-sections not supported for this target");
4962 flag_data_sections
= 0;
4966 if (flag_function_sections
&& profile_flag
)
4968 warning ("-ffunction-sections disabled; it makes profiling impossible");
4969 flag_function_sections
= 0;
4972 #ifndef HAVE_prefetch
4973 if (flag_prefetch_loop_arrays
)
4975 warning ("-fprefetch-loop-arrays not supported for this target");
4976 flag_prefetch_loop_arrays
= 0;
4979 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
4981 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4982 flag_prefetch_loop_arrays
= 0;
4986 /* This combination of options isn't handled for i386 targets and doesn't
4987 make much sense anyway, so don't allow it. */
4988 if (flag_prefetch_loop_arrays
&& optimize_size
)
4990 warning ("-fprefetch-loop-arrays is not supported with -Os");
4991 flag_prefetch_loop_arrays
= 0;
4994 #ifndef OBJECT_FORMAT_ELF
4995 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
4996 warning ("-ffunction-sections may affect debugging on some targets");
5000 /* Language-independent initialization, before language-dependent
5003 lang_independent_init ()
5005 decl_printable_name
= decl_name
;
5006 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
5008 /* Initialize the garbage-collector, and string pools. */
5010 ggc_add_rtx_root (&stack_limit_rtx
, 1);
5011 ggc_add_tree_root (¤t_function_decl
, 1);
5012 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
5017 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5018 || debug_info_level
== DINFO_LEVEL_VERBOSE
5019 #ifdef VMS_DEBUGGING_INFO
5020 /* Enable line number info for traceback */
5021 || debug_info_level
> DINFO_LEVEL_NONE
5023 || flag_test_coverage
5024 || warn_notreached
);
5030 init_function_once ();
5031 init_stor_layout_once ();
5032 init_varasm_once ();
5033 init_EXPR_INSN_LIST_cache ();
5035 /* The following initialization functions need to generate rtl, so
5036 provide a dummy function context for them. */
5037 init_dummy_function_start ();
5040 if (flag_caller_saves
)
5041 init_caller_save ();
5042 expand_dummy_function_end ();
5045 /* Language-dependent initialization. Returns non-zero on success. */
5047 lang_dependent_init (name
)
5050 if (dump_base_name
== 0)
5051 dump_base_name
= name
? name
: "gccdump";
5053 /* Front-end initialization. This hook can assume that GC,
5054 identifier hashes etc. are set up, but debug initialization is
5055 not done yet. This routine must return the original filename
5056 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5057 name
= (*lang_hooks
.init
) (name
);
5061 /* Is this duplication necessary? */
5062 name
= ggc_strdup (name
);
5063 main_input_filename
= input_filename
= name
;
5064 init_asm_output (name
);
5066 /* These create various _DECL nodes, so need to be called after the
5067 front end is initialized. */
5071 /* Put an entry on the input file stack for the main input file. */
5072 push_srcloc (input_filename
, 0);
5074 /* If dbx symbol table desired, initialize writing it and output the
5075 predefined types. */
5076 timevar_push (TV_SYMOUT
);
5078 #ifdef DWARF2_UNWIND_INFO
5079 if (dwarf2out_do_frame ())
5080 dwarf2out_frame_init ();
5083 /* Now we have the correct original filename, we can initialize
5085 (*debug_hooks
->init
) (name
);
5087 timevar_pop (TV_SYMOUT
);
5092 /* Clean up: close opened files, etc. */
5097 /* Close the dump files. */
5098 if (flag_gen_aux_info
)
5100 fclose (aux_info_file
);
5102 unlink (aux_info_file_name
);
5105 /* Close non-debugging input and output files. Take special care to note
5106 whether fclose returns an error, since the pages might still be on the
5107 buffer chain while the file is open. */
5111 if (ferror (asm_out_file
) != 0)
5112 fatal_io_error ("error writing to %s", asm_file_name
);
5113 if (fclose (asm_out_file
) != 0)
5114 fatal_io_error ("error closing %s", asm_file_name
);
5117 /* Do whatever is necessary to finish printing the graphs. */
5118 if (graph_dump_format
!= no_graph
)
5122 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5123 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5128 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5129 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5130 finish_graph_dump_file (dump_base_name
, suffix
);
5137 ggc_print_statistics ();
5138 stringpool_statistics ();
5139 dump_tree_statistics ();
5142 /* Free up memory for the benefit of leak detectors. */
5145 /* Language-specific end of compilation actions. */
5146 (*lang_hooks
.finish
) ();
5149 /* Initialize the compiler, and compile the input file. */
5153 /* The bulk of command line switch processing. */
5156 /* We cannot start timing until after options are processed since that
5157 says if we run timers or not. */
5159 timevar_start (TV_TOTAL
);
5161 /* Language-independent initialization. Also sets up GC, identifier
5163 lang_independent_init ();
5165 /* Language-dependent initialization. Returns true on success. */
5166 if (lang_dependent_init (filename
))
5171 /* Stop timing and print the times. */
5172 timevar_stop (TV_TOTAL
);
5173 timevar_print (stderr
);
5176 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5177 Decode command args, then call compile_file.
5178 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5179 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5181 It is not safe to call this function more than once. */
5184 toplev_main (argc
, argv
)
5190 /* Initialization of GCC's environment, and diagnostics. */
5191 general_init (argv
[0]);
5193 /* Parse the options and do minimal processing; basically just
5194 enough to default flags appropriately. */
5195 parse_options_and_default_flags (argc
, argv
);
5197 /* Exit early if we can (e.g. -help). */
5198 if (!exit_after_options
)
5201 if (errorcount
|| sorrycount
)
5202 return (FATAL_EXIT_CODE
);
5204 return (SUCCESS_EXIT_CODE
);