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. */
96 /* The extra parameters substantially improve the I/O performance. */
99 vms_fopen (fname
, type
)
103 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
104 fixed arguments, which matches ANSI's specification but not VAXCRTL's
105 pre-ANSI implementation. This hack circumvents the mismatch problem. */
106 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
109 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
110 "deq=64", "fop=tef", "shr=nil");
112 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
115 #define fopen vms_fopen
118 /* Carry information from ASM_DECLARE_OBJECT_NAME
119 to ASM_FINISH_DECLARE_OBJECT. */
121 extern int size_directive_output
;
122 extern tree last_assemble_variable_decl
;
124 static void general_init
PARAMS ((char *));
125 static void parse_options_and_default_flags
PARAMS ((int, char **));
126 static void do_compile
PARAMS ((void));
127 static void process_options
PARAMS ((void));
128 static void lang_independent_init
PARAMS ((void));
129 static int lang_dependent_init
PARAMS ((const char *));
130 static void init_asm_output
PARAMS ((const char *));
131 static void finalize
PARAMS ((void));
133 static void set_target_switch
PARAMS ((const char *));
134 static const char *decl_name
PARAMS ((tree
, int));
136 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
137 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
138 static void set_float_handler
PARAMS ((jmp_buf));
139 static void compile_file
PARAMS ((void));
140 static void display_help
PARAMS ((void));
141 static void display_target_options
PARAMS ((void));
143 static void decode_d_option
PARAMS ((const char *));
144 static int decode_f_option
PARAMS ((const char *));
145 static int decode_W_option
PARAMS ((const char *));
146 static int decode_g_option
PARAMS ((const char *));
147 static unsigned int independent_decode_option
PARAMS ((int, char **));
149 static void print_version
PARAMS ((FILE *, const char *));
150 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
151 const char *, const char *,
152 const char *, const char *));
153 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
154 const char *, const char *));
156 /* Length of line when printing switch values. */
159 /* Name of program invoked, sans directories. */
161 const char *progname
;
163 /* Copy of arguments to toplev_main. */
167 /* Name of current original source file (what was input to cpp).
168 This comes from each #-command in the actual input. */
170 const char *input_filename
;
172 /* Name of top-level original source file (what was input to cpp).
173 This comes from the #-command at the beginning of the actual input.
174 If there isn't any there, then this is the cc1 input file name. */
176 const char *main_input_filename
;
178 /* Current line number in real source file. */
182 /* Nonzero if it is unsafe to create any new pseudo registers. */
185 /* Stack of currently pending input files. */
187 struct file_stack
*input_file_stack
;
189 /* Incremented on each change to input_file_stack. */
190 int input_file_stack_tick
;
192 /* Name to use as base of names for dump output files. */
194 const char *dump_base_name
;
196 /* Format to use to print dumpfile index value */
197 #ifndef DUMPFILE_FORMAT
198 #define DUMPFILE_FORMAT ".%02d."
201 /* Bit flags that specify the machine subtype we are compiling for.
202 Bits are tested using macros TARGET_... defined in the tm.h file
203 and set by `-m...' switches. Must be defined in rtlanal.c. */
205 extern int target_flags
;
207 /* Debug hooks - dependent upon command line options. */
209 struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
211 /* Describes a dump file. */
213 struct dump_file_info
215 /* The unique extension to apply, e.g. ".jump". */
216 const char *const extension
;
218 /* The -d<c> character that enables this dump file. */
219 char const debug_switch
;
221 /* True if there is a corresponding graph dump file. */
222 char const graph_dump_p
;
224 /* True if the user selected this dump. */
227 /* True if the files have been initialized (ie truncated). */
231 /* Enumerate the extant dump files. */
270 /* Describes all the dump files. Should be kept in order of the
271 pass and in sync with dump_file_index above.
273 Remaining -d letters:
279 static struct dump_file_info dump_file
[DFI_MAX
] =
281 { "rtl", 'r', 0, 0, 0 },
282 { "sibling", 'i', 0, 0, 0 },
283 { "eh", 'h', 0, 0, 0 },
284 { "jump", 'j', 0, 0, 0 },
285 { "ssa", 'e', 1, 0, 0 },
286 { "ssaccp", 'W', 1, 0, 0 },
287 { "ssadce", 'X', 1, 0, 0 },
288 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
289 { "cse", 's', 0, 0, 0 },
290 { "addressof", 'F', 0, 0, 0 },
291 { "gcse", 'G', 1, 0, 0 },
292 { "loop", 'L', 1, 0, 0 },
293 { "cse2", 't', 1, 0, 0 },
294 { "cfg", 'f', 1, 0, 0 },
295 { "bp", 'b', 1, 0, 0 },
296 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
297 { "combine", 'c', 1, 0, 0 },
298 { "ce", 'C', 1, 0, 0 },
299 { "regmove", 'N', 1, 0, 0 },
300 { "sched", 'S', 1, 0, 0 },
301 { "lreg", 'l', 1, 0, 0 },
302 { "greg", 'g', 1, 0, 0 },
303 { "postreload", 'o', 1, 0, 0 },
304 { "flow2", 'w', 1, 0, 0 },
305 { "peephole2", 'z', 1, 0, 0 },
306 { "rnreg", 'n', 1, 0, 0 },
307 { "ce2", 'E', 1, 0, 0 },
308 { "sched2", 'R', 1, 0, 0 },
309 { "stack", 'k', 1, 0, 0 },
310 { "bbro", 'B', 1, 0, 0 },
311 { "mach", 'M', 1, 0, 0 },
312 { "dbr", 'd', 0, 0, 0 },
315 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
316 static void close_dump_file
PARAMS ((enum dump_file_index
,
317 void (*) (FILE *, rtx
), rtx
));
319 /* Other flags saying which kinds of debugging dump have been requested. */
321 int rtl_dump_and_exit
;
322 int flag_print_asm_name
;
323 static int version_flag
;
324 static char *filename
;
325 enum graph_dump_types graph_dump_format
;
327 /* Name for output file of assembly code, specified with -o. */
331 /* Value of the -G xx switch, and whether it was passed or not. */
335 /* Type(s) of debugging information we are producing (if any).
336 See flags.h for the definitions of the different possible
337 types of debugging information. */
338 enum debug_info_type write_symbols
= NO_DEBUG
;
340 /* Level of debugging information we are producing. See flags.h
341 for the definitions of the different possible levels. */
342 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
344 /* Nonzero means use GNU-only extensions in the generated symbolic
345 debugging information. */
346 /* Currently, this only has an effect when write_symbols is set to
347 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
348 int use_gnu_debug_info_extensions
= 0;
350 /* Nonzero means do optimizations. -O.
351 Particular numeric values stand for particular amounts of optimization;
352 thus, -O2 stores 2 here. However, the optimizations beyond the basic
353 ones are not controlled directly by this variable. Instead, they are
354 controlled by individual `flag_...' variables that are defaulted
355 based on this variable. */
359 /* Nonzero means optimize for size. -Os.
360 The only valid values are zero and non-zero. When optimize_size is
361 non-zero, optimize defaults to 2, but certain individual code
362 bloating optimizations are disabled. */
364 int optimize_size
= 0;
366 /* Nonzero if we should exit after parsing options. */
367 static int exit_after_options
= 0;
369 /* The FUNCTION_DECL for the function currently being compiled,
370 or 0 if between functions. */
371 tree current_function_decl
;
373 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
375 tree current_function_func_begin_label
;
377 /* Pointer to function to compute the name to use to print a declaration.
378 DECL is the declaration in question.
379 VERBOSITY determines what information will be printed:
380 0: DECL_NAME, demangled as necessary.
381 1: and scope information.
382 2: and any other information that might be interesting, such as function
383 parameter types in C++. */
385 const char *(*decl_printable_name
) PARAMS ((tree
, int));
387 /* Pointer to function to compute rtl for a language-specific tree code. */
389 typedef rtx (*lang_expand_expr_t
)
390 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
391 enum expand_modifier modifier
));
393 lang_expand_expr_t lang_expand_expr
= 0;
395 /* Pointer to function to finish handling an incomplete decl at the
396 end of compilation. */
398 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
400 /* Nonzero if doing dwarf2 duplicate elimination. */
402 int flag_eliminate_dwarf2_dups
= 0;
404 /* Nonzero if generating code to do profiling. */
406 int profile_flag
= 0;
408 /* Nonzero if generating code to profile program flow graph arcs. */
410 int profile_arc_flag
= 0;
412 /* Nonzero if generating info for gcov to calculate line test coverage. */
414 int flag_test_coverage
= 0;
416 /* Nonzero indicates that branch taken probabilities should be calculated. */
418 int flag_branch_probabilities
= 0;
420 /* Nonzero if basic blocks should be reordered. */
422 int flag_reorder_blocks
= 0;
424 /* Nonzero if registers should be renamed. */
426 int flag_rename_registers
= 0;
427 int flag_cprop_registers
= 0;
429 /* Nonzero for -pedantic switch: warn about anything
430 that standard spec forbids. */
434 /* Temporarily suppress certain warnings.
435 This is set while reading code from a system header file. */
437 int in_system_header
= 0;
439 /* Don't print functions as they are compiled. -quiet. */
443 /* Print times taken by the various passes. -ftime-report. */
447 /* Print memory still in use at end of compilation (which may have little
448 to do with peak memory consumption). -fmem-report. */
452 /* Non-zero means to collect statistics which might be expensive
453 and to print them when we are done. */
454 int flag_detailed_statistics
= 0;
459 /* Nonzero means `char' should be signed. */
461 int flag_signed_char
;
463 /* Nonzero means give an enum type only as many bytes as it needs. */
465 int flag_short_enums
;
467 /* Nonzero for -fcaller-saves: allocate values in regs that need to
468 be saved across function calls, if that produces overall better code.
469 Optional now, so people can test it. */
471 #ifdef DEFAULT_CALLER_SAVES
472 int flag_caller_saves
= 1;
474 int flag_caller_saves
= 0;
477 /* Nonzero if structures and unions should be returned in memory.
479 This should only be defined if compatibility with another compiler or
480 with an ABI is needed, because it results in slower code. */
482 #ifndef DEFAULT_PCC_STRUCT_RETURN
483 #define DEFAULT_PCC_STRUCT_RETURN 1
486 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
488 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
490 /* Nonzero for -fforce-mem: load memory value into a register
491 before arithmetic on it. This makes better cse but slower compilation. */
493 int flag_force_mem
= 0;
495 /* Nonzero for -fforce-addr: load memory address into a register before
496 reference to memory. This makes better cse but slower compilation. */
498 int flag_force_addr
= 0;
500 /* Nonzero for -fdefer-pop: don't pop args after each function call;
501 instead save them up to pop many calls' args with one insns. */
503 int flag_defer_pop
= 0;
505 /* Nonzero for -ffloat-store: don't allocate floats and doubles
506 in extended-precision registers. */
508 int flag_float_store
= 0;
510 /* Nonzero for -fcse-follow-jumps:
511 have cse follow jumps to do a more extensive job. */
513 int flag_cse_follow_jumps
;
515 /* Nonzero for -fcse-skip-blocks:
516 have cse follow a branch around a block. */
517 int flag_cse_skip_blocks
;
519 /* Nonzero for -fexpensive-optimizations:
520 perform miscellaneous relatively-expensive optimizations. */
521 int flag_expensive_optimizations
;
523 /* Nonzero for -fthread-jumps:
524 have jump optimize output of loop. */
526 int flag_thread_jumps
;
528 /* Nonzero enables strength-reduction in loop.c. */
530 int flag_strength_reduce
= 0;
532 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
533 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
534 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
537 int flag_unroll_loops
;
539 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
540 This is generally not a win. */
542 int flag_unroll_all_loops
;
544 /* Nonzero enables prefetch optimizations for arrays in loops. */
546 int flag_prefetch_loop_arrays
;
548 /* Nonzero forces all invariant computations in loops to be moved
551 int flag_move_all_movables
= 0;
553 /* Nonzero forces all general induction variables in loops to be
556 int flag_reduce_all_givs
= 0;
558 /* Nonzero to perform full register move optimization passes. This is the
561 int flag_regmove
= 0;
563 /* Nonzero for -fwritable-strings:
564 store string constants in data segment and don't uniquize them. */
566 int flag_writable_strings
= 0;
568 /* Nonzero means don't put addresses of constant functions in registers.
569 Used for compiling the Unix kernel, where strange substitutions are
570 done on the assembly output. */
572 int flag_no_function_cse
= 0;
574 /* Nonzero for -fomit-frame-pointer:
575 don't make a frame pointer in simple functions that don't require one. */
577 int flag_omit_frame_pointer
= 0;
579 /* Nonzero means place each function into its own section on those platforms
580 which support arbitrary section names and unlimited numbers of sections. */
582 int flag_function_sections
= 0;
584 /* ... and similar for data. */
586 int flag_data_sections
= 0;
588 /* Nonzero to inhibit use of define_optimization peephole opts. */
590 int flag_no_peephole
= 0;
592 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
594 int flag_optimize_sibling_calls
= 0;
596 /* Nonzero means the front end generally wants `errno' maintained by math
597 operations, like built-in SQRT. */
599 int flag_errno_math
= 1;
601 /* Nonzero means that unsafe floating-point math optimizations are allowed
602 for the sake of speed. IEEE compliance is not guaranteed, and operations
603 are allowed to assume that their arguments and results are "normal"
604 (e.g., nonnegative for SQRT). */
606 int flag_unsafe_math_optimizations
= 0;
608 /* Zero means that floating-point math operations cannot generate a
609 (user-visible) trap. This is the case, for example, in nonstop
610 IEEE 754 arithmetic. */
612 int flag_trapping_math
= 1;
614 /* 0 means straightforward implementation of complex divide acceptable.
615 1 means wide ranges of inputs must work for complex divide.
616 2 means C99-like requirements for complex divide (not yet implemented). */
618 int flag_complex_divide_method
= 0;
620 /* Nonzero means all references through pointers are volatile. */
624 /* Nonzero means treat all global and extern variables as volatile. */
626 int flag_volatile_global
;
628 /* Nonzero means treat all static variables as volatile. */
630 int flag_volatile_static
;
632 /* Nonzero means just do syntax checking; don't output anything. */
634 int flag_syntax_only
= 0;
636 /* Nonzero means perform global cse. */
638 static int flag_gcse
;
640 /* Nonzero means to use global dataflow analysis to eliminate
641 useless null pointer tests. */
643 static int flag_delete_null_pointer_checks
;
645 /* Nonzero means to do the enhanced load motion during gcse, which trys
646 to hoist loads by not killing them when a store to the same location
649 int flag_gcse_lm
= 1;
651 /* Nonzero means to perform store motion after gcse, which will try to
652 move stores closer to the exit block. Its not very effective without
655 int flag_gcse_sm
= 1;
657 /* Nonzero means to rerun cse after loop optimization. This increases
658 compilation time about 20% and picks up a few more common expressions. */
660 static int flag_rerun_cse_after_loop
;
662 /* Nonzero means to run loop optimizations twice. */
664 int flag_rerun_loop_opt
;
666 /* Nonzero for -finline-functions: ok to inline functions that look like
667 good inline candidates. */
669 int flag_inline_functions
;
671 /* Nonzero for -fkeep-inline-functions: even if we make a function
672 go inline everywhere, keep its definition around for debugging
675 int flag_keep_inline_functions
;
677 /* Nonzero means that functions will not be inlined. */
681 /* Nonzero means that we should emit static const variables
682 regardless of whether or not optimization is turned on. */
684 int flag_keep_static_consts
= 1;
686 /* Nonzero means we should be saving declaration info into a .X file. */
688 int flag_gen_aux_info
= 0;
690 /* Specified name of aux-info file. */
692 static char *aux_info_file_name
;
694 /* Nonzero means make the text shared if supported. */
696 int flag_shared_data
;
698 /* Nonzero means schedule into delayed branch slots if supported. */
700 int flag_delayed_branch
;
702 /* Nonzero if we are compiling pure (sharable) code.
703 Value is 1 if we are doing reasonable (i.e. simple
704 offset into offset table) pic. Value is 2 if we can
705 only perform register offsets. */
709 /* Nonzero means generate extra code for exception handling and enable
710 exception handling. */
714 /* Nonzero means generate frame unwind info table when supported. */
716 int flag_unwind_tables
= 0;
718 /* Nonzero means generate frame unwind info table exact at each insn boundary */
720 int flag_asynchronous_unwind_tables
= 0;
722 /* Nonzero means don't place uninitialized global data in common storage
727 /* Nonzero means pretend it is OK to examine bits of target floats,
728 even if that isn't true. The resulting code will have incorrect constants,
729 but the same series of instructions that the native compiler would make. */
731 int flag_pretend_float
;
733 /* Nonzero means change certain warnings into errors.
734 Usually these are warnings about failure to conform to some standard. */
736 int flag_pedantic_errors
= 0;
738 /* flag_schedule_insns means schedule insns within basic blocks (before
740 flag_schedule_insns_after_reload means schedule insns after
743 int flag_schedule_insns
= 0;
744 int flag_schedule_insns_after_reload
= 0;
746 /* The following flags have effect only for scheduling before register
749 flag_schedule_interblock means schedule insns accross basic blocks.
750 flag_schedule_speculative means allow speculative motion of non-load insns.
751 flag_schedule_speculative_load means allow speculative motion of some
753 flag_schedule_speculative_load_dangerous allows speculative motion of more
756 int flag_schedule_interblock
= 1;
757 int flag_schedule_speculative
= 1;
758 int flag_schedule_speculative_load
= 0;
759 int flag_schedule_speculative_load_dangerous
= 0;
761 int flag_single_precision_constant
;
763 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
764 by a cheaper branch on a count register. */
765 int flag_branch_on_count_reg
= 1;
767 /* -finhibit-size-directive inhibits output of .size for ELF.
768 This is used only for compiling crtstuff.c,
769 and it may be extended to other effects
770 needed for crtstuff.c on other systems. */
771 int flag_inhibit_size_directive
= 0;
773 /* -fverbose-asm causes extra commentary information to be produced in
774 the generated assembly code (to make it more readable). This option
775 is generally only of use to those who actually need to read the
776 generated assembly code (perhaps while debugging the compiler itself).
777 -fno-verbose-asm, the default, causes the extra information
778 to be omitted and is useful when comparing two assembler files. */
780 int flag_verbose_asm
= 0;
782 /* -dA causes debug commentary information to be produced in
783 the generated assembly code (to make it more readable). This option
784 is generally only of use to those who actually need to read the
785 generated assembly code (perhaps while debugging the compiler itself).
786 Currently, this switch is only used by dwarfout.c; however, it is intended
787 to be a catchall for printing debug information in the assembler file. */
789 int flag_debug_asm
= 0;
791 /* -dP causes the rtl to be emitted as a comment in assembly. */
793 int flag_dump_rtl_in_asm
= 0;
795 /* -fgnu-linker specifies use of the GNU linker for initializations.
796 (Or, more generally, a linker that handles initializations.)
797 -fno-gnu-linker says that collect2 will be used. */
799 int flag_gnu_linker
= 0;
801 int flag_gnu_linker
= 1;
807 /* Enable ssa conditional constant propagation. */
808 int flag_ssa_ccp
= 0;
810 /* Enable ssa aggressive dead code elimination. */
811 int flag_ssa_dce
= 0;
813 /* Tag all structures with __attribute__(packed). */
814 int flag_pack_struct
= 0;
816 /* Emit code to check for stack overflow; also may cause large objects
817 to be allocated dynamically. */
818 int flag_stack_check
;
820 /* When non-NULL, indicates that whenever space is allocated on the
821 stack, the resulting stack pointer must not pass this
822 address---that is, for stacks that grow downward, the stack pointer
823 must always be greater than or equal to this address; for stacks
824 that grow upward, the stack pointer must be less than this address.
825 At present, the rtx may be either a REG or a SYMBOL_REF, although
826 the support provided depends on the backend. */
829 /* 0 if pointer arguments may alias each other. True in C.
830 1 if pointer arguments may not alias each other but may alias
832 2 if pointer arguments may not alias each other and may not
833 alias global variables. True in Fortran.
834 This defaults to 0 for C. */
835 int flag_argument_noalias
= 0;
837 /* Nonzero if we should do (language-dependent) alias analysis.
838 Typically, this analysis will assume that expressions of certain
839 types do not alias expressions of certain other types. Only used
840 if alias analysis (in general) is enabled. */
841 int flag_strict_aliasing
= 0;
843 /* Instrument functions with calls at entry and exit, for profiling. */
844 int flag_instrument_function_entry_exit
= 0;
846 /* Nonzero means ignore `#ident' directives. 0 means handle them.
847 On SVR4 targets, it also controls whether or not to emit a
848 string identifying the compiler. */
850 int flag_no_ident
= 0;
852 /* This will perform a peephole pass before sched2. */
853 int flag_peephole2
= 0;
855 /* This will try to guess branch probabilities. */
856 int flag_guess_branch_prob
= 0;
858 /* -fbounded-pointers causes gcc to compile pointers as composite
859 objects occupying three words: the pointer value, the base address
860 of the referent object, and the address immediately beyond the end
861 of the referent object. The base and extent allow us to perform
862 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
863 int flag_bounded_pointers
= 0;
865 /* -fcheck-bounds causes gcc to generate array bounds checks.
866 For C, C++: defaults to value of flag_bounded_pointers.
867 For ObjC: defaults to off.
868 For Java: defaults to on.
869 For Fortran: defaults to off.
870 For CHILL: defaults to off. */
871 int flag_bounds_check
= 0;
873 /* This will attempt to merge constant section constants, if 1 only
874 string constants and constants from constant pool, if 2 also constant
876 int flag_merge_constants
= 1;
878 /* If one, renumber instruction UIDs to reduce the number of
879 unused UIDs if there are a lot of instructions. If greater than
880 one, unconditionally renumber instruction UIDs. */
881 int flag_renumber_insns
= 1;
883 /* Values of the -falign-* flags: how much to align labels in code.
884 0 means `use default', 1 means `don't align'.
885 For each variable, there is an _log variant which is the power
886 of two not less than the variable, for .align output. */
890 int align_loops_max_skip
;
893 int align_jumps_max_skip
;
895 int align_labels_log
;
896 int align_labels_max_skip
;
898 int align_functions_log
;
900 /* Table of supported debugging formats. */
903 const char *const arg
;
904 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
905 constant expression, we use NO_DEBUG in its place. */
906 const enum debug_info_type debug_type
;
907 const int use_extensions_p
;
908 const char *const description
;
912 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
913 N_("Generate debugging info in default format") },
914 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
915 #ifdef DBX_DEBUGGING_INFO
916 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
917 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
919 #ifdef DWARF_DEBUGGING_INFO
920 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
921 { "dwarf+", DWARF_DEBUG
, 1,
922 N_("Generate extended DWARF-1 format debug info") },
924 #ifdef DWARF2_DEBUGGING_INFO
925 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
927 #ifdef XCOFF_DEBUGGING_INFO
928 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
929 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
931 #ifdef SDB_DEBUGGING_INFO
932 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
939 const char *const string
;
942 const char *const description
;
944 lang_independent_options
;
948 /* Add or remove a leading underscore from user symbols. */
949 int flag_leading_underscore
= -1;
951 /* The user symbol prefix after having resolved same. */
952 const char *user_label_prefix
;
954 static const param_info lang_independent_params
[] = {
955 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
956 { OPTION, DEFAULT, HELP },
957 #include "params.def"
962 /* A default for same. */
963 #ifndef USER_LABEL_PREFIX
964 #define USER_LABEL_PREFIX ""
967 /* Table of language-independent -f options.
968 STRING is the option name. VARIABLE is the address of the variable.
969 ON_VALUE is the value to store in VARIABLE
970 if `-fSTRING' is seen as an option.
971 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
973 static const lang_independent_options f_options
[] =
975 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
976 N_("Perform DWARF2 duplicate elimination") },
977 {"float-store", &flag_float_store
, 1,
978 N_("Do not store floats in registers") },
979 {"volatile", &flag_volatile
, 1,
980 N_("Consider all mem refs through pointers as volatile") },
981 {"volatile-global", &flag_volatile_global
, 1,
982 N_("Consider all mem refs to global data to be volatile") },
983 {"volatile-static", &flag_volatile_static
, 1,
984 N_("Consider all mem refs to static data to be volatile") },
985 {"defer-pop", &flag_defer_pop
, 1,
986 N_("Defer popping functions args from stack until later") },
987 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
988 N_("When possible do not generate stack frames") },
989 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
990 N_("Optimize sibling and tail recursive calls") },
991 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
992 N_("When running CSE, follow jumps to their targets") },
993 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
994 N_("When running CSE, follow conditional jumps") },
995 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
996 N_("Perform a number of minor, expensive optimizations") },
997 {"thread-jumps", &flag_thread_jumps
, 1,
998 N_("Perform jump threading optimizations") },
999 {"strength-reduce", &flag_strength_reduce
, 1,
1000 N_("Perform strength reduction optimizations") },
1001 {"unroll-loops", &flag_unroll_loops
, 1,
1002 N_("Perform loop unrolling when iteration count is known") },
1003 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1004 N_("Perform loop unrolling for all loops") },
1005 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
1006 N_("Generate prefetch instructions, if available, for arrays in loops") },
1007 {"move-all-movables", &flag_move_all_movables
, 1,
1008 N_("Force all loop invariant computations out of loops") },
1009 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1010 N_("Strength reduce all loop general induction variables") },
1011 {"writable-strings", &flag_writable_strings
, 1,
1012 N_("Store strings in writable data section") },
1013 {"peephole", &flag_no_peephole
, 0,
1014 N_("Enable machine specific peephole optimizations") },
1015 {"force-mem", &flag_force_mem
, 1,
1016 N_("Copy memory operands into registers before using") },
1017 {"force-addr", &flag_force_addr
, 1,
1018 N_("Copy memory address constants into regs before using") },
1019 {"function-cse", &flag_no_function_cse
, 0,
1020 N_("Allow function addresses to be held in registers") },
1021 {"inline-functions", &flag_inline_functions
, 1,
1022 N_("Integrate simple functions into their callers") },
1023 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1024 N_("Generate code for funcs even if they are fully inlined") },
1025 {"inline", &flag_no_inline
, 0,
1026 N_("Pay attention to the 'inline' keyword") },
1027 {"keep-static-consts", &flag_keep_static_consts
, 1,
1028 N_("Emit static const variables even if they are not used") },
1029 {"syntax-only", &flag_syntax_only
, 1,
1030 N_("Check for syntax errors, then stop") },
1031 {"shared-data", &flag_shared_data
, 1,
1032 N_("Mark data as shared rather than private") },
1033 {"caller-saves", &flag_caller_saves
, 1,
1034 N_("Enable saving registers around function calls") },
1035 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1036 N_("Return 'short' aggregates in memory, not registers") },
1037 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1038 N_("Return 'short' aggregates in registers") },
1039 {"delayed-branch", &flag_delayed_branch
, 1,
1040 N_("Attempt to fill delay slots of branch instructions") },
1041 {"gcse", &flag_gcse
, 1,
1042 N_("Perform the global common subexpression elimination") },
1043 {"gcse-lm", &flag_gcse_lm
, 1,
1044 N_("Perform enhanced load motion during global subexpression elimination") },
1045 {"gcse-sm", &flag_gcse_sm
, 1,
1046 N_("Perform store motion after global subexpression elimination") },
1047 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1048 N_("Run CSE pass after loop optimizations") },
1049 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1050 N_("Run the loop optimizer twice") },
1051 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1052 N_("Delete useless null pointer checks") },
1053 {"pretend-float", &flag_pretend_float
, 1,
1054 N_("Pretend that host and target use the same FP format") },
1055 {"schedule-insns", &flag_schedule_insns
, 1,
1056 N_("Reschedule instructions before register allocation") },
1057 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1058 N_("Reschedule instructions after register allocation") },
1059 {"sched-interblock",&flag_schedule_interblock
, 1,
1060 N_("Enable scheduling across basic blocks") },
1061 {"sched-spec",&flag_schedule_speculative
, 1,
1062 N_("Allow speculative motion of non-loads") },
1063 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1064 N_("Allow speculative motion of some loads") },
1065 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1066 N_("Allow speculative motion of more loads") },
1067 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1068 N_("Replace add,compare,branch with branch on count reg") },
1069 {"pic", &flag_pic
, 1,
1070 N_("Generate position independent code, if possible") },
1071 {"PIC", &flag_pic
, 2, ""},
1072 {"exceptions", &flag_exceptions
, 1,
1073 N_("Enable exception handling") },
1074 {"unwind-tables", &flag_unwind_tables
, 1,
1075 N_("Just generate unwind tables for exception handling") },
1076 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1077 N_("Generate unwind tables exact at each instruction boundary") },
1078 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1079 N_("Support synchronous non-call exceptions") },
1080 {"profile-arcs", &profile_arc_flag
, 1,
1081 N_("Insert arc based program profiling code") },
1082 {"test-coverage", &flag_test_coverage
, 1,
1083 N_("Create data files needed by gcov") },
1084 {"branch-probabilities", &flag_branch_probabilities
, 1,
1085 N_("Use profiling information for branch probabilities") },
1086 {"reorder-blocks", &flag_reorder_blocks
, 1,
1087 N_("Reorder basic blocks to improve code placement") },
1088 {"rename-registers", &flag_rename_registers
, 1,
1089 N_("Do the register renaming optimization pass") },
1090 {"cprop-registers", &flag_cprop_registers
, 1,
1091 N_("Do the register copy-propagation optimization pass") },
1092 {"common", &flag_no_common
, 0,
1093 N_("Do not put uninitialized globals in the common section") },
1094 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1095 N_("Do not generate .size directives") },
1096 {"function-sections", &flag_function_sections
, 1,
1097 N_("place each function into its own section") },
1098 {"data-sections", &flag_data_sections
, 1,
1099 N_("place data items into their own section") },
1100 {"verbose-asm", &flag_verbose_asm
, 1,
1101 N_("Add extra commentry to assembler output") },
1102 {"gnu-linker", &flag_gnu_linker
, 1,
1103 N_("Output GNU ld formatted global initializers") },
1104 {"regmove", &flag_regmove
, 1,
1105 N_("Enables a register move optimization") },
1106 {"optimize-register-move", &flag_regmove
, 1,
1107 N_("Do the full regmove optimization pass") },
1108 {"pack-struct", &flag_pack_struct
, 1,
1109 N_("Pack structure members together without holes") },
1110 {"stack-check", &flag_stack_check
, 1,
1111 N_("Insert stack checking code into the program") },
1112 {"argument-alias", &flag_argument_noalias
, 0,
1113 N_("Specify that arguments may alias each other & globals") },
1114 {"argument-noalias", &flag_argument_noalias
, 1,
1115 N_("Assume arguments may alias globals but not each other") },
1116 {"argument-noalias-global", &flag_argument_noalias
, 2,
1117 N_("Assume arguments do not alias each other or globals") },
1118 {"strict-aliasing", &flag_strict_aliasing
, 1,
1119 N_("Assume strict aliasing rules apply") },
1120 {"align-loops", &align_loops
, 0,
1121 N_("Align the start of loops") },
1122 {"align-jumps", &align_jumps
, 0,
1123 N_("Align labels which are only reached by jumping") },
1124 {"align-labels", &align_labels
, 0,
1125 N_("Align all labels") },
1126 {"align-functions", &align_functions
, 0,
1127 N_("Align the start of functions") },
1128 {"merge-constants", &flag_merge_constants
, 1,
1129 N_("Attempt to merge identical constants accross compilation units") },
1130 {"merge-all-constants", &flag_merge_constants
, 2,
1131 N_("Attempt to merge identical constants and constant variables") },
1132 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1133 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1134 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1135 N_("Instrument function entry/exit with profiling calls") },
1136 {"ssa", &flag_ssa
, 1,
1137 N_("Enable SSA optimizations") },
1138 {"ssa-ccp", &flag_ssa_ccp
, 1,
1139 N_("Enable SSA conditional constant propagation") },
1140 {"ssa-dce", &flag_ssa_dce
, 1,
1141 N_("Enable aggressive SSA dead code elimination") },
1142 {"leading-underscore", &flag_leading_underscore
, 1,
1143 N_("External symbols have a leading underscore") },
1144 {"ident", &flag_no_ident
, 0,
1145 N_("Process #ident directives") },
1146 { "peephole2", &flag_peephole2
, 1,
1147 N_("Enables an rtl peephole pass run before sched2") },
1148 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1149 N_("Enables guessing of branch probabilities") },
1150 {"math-errno", &flag_errno_math
, 1,
1151 N_("Set errno after built-in math functions") },
1152 {"trapping-math", &flag_trapping_math
, 1,
1153 N_("Floating-point operations can trap") },
1154 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1155 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1156 {"bounded-pointers", &flag_bounded_pointers
, 1,
1157 N_("Compile pointers as triples: value, base & end") },
1158 {"bounds-check", &flag_bounds_check
, 1,
1159 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1160 {"single-precision-constant", &flag_single_precision_constant
, 1,
1161 N_("Convert floating point constant to single precision constant") },
1162 {"time-report", &time_report
, 1,
1163 N_("Report time taken by each compiler pass at end of run") },
1164 {"mem-report", &mem_report
, 1,
1165 N_("Report on permanent memory allocation at end of run") },
1166 { "trapv", &flag_trapv
, 1,
1167 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1170 /* Table of language-specific options. */
1172 static const struct lang_opt
1174 const char *const option
;
1175 const char *const description
;
1177 documented_lang_options
[] =
1179 /* In order not to overload the --help output, the convention
1180 used here is to only describe those options which are not
1181 enabled by default. */
1184 N_("Compile just for ISO C89") },
1185 { "-fallow-single-precision",
1186 N_("Do not promote floats to double if using -traditional") },
1188 N_("Determine language standard") },
1190 { "-fsigned-bitfields", "" },
1191 { "-funsigned-bitfields",
1192 N_("Make bit-fields by unsigned by default") },
1193 { "-fno-signed-bitfields", "" },
1194 { "-fno-unsigned-bitfields","" },
1196 N_("Make 'char' be signed by default") },
1197 { "-funsigned-char",
1198 N_("Make 'char' be unsigned by default") },
1199 { "-fno-signed-char", "" },
1200 { "-fno-unsigned-char", "" },
1202 { "-ftraditional", "" },
1204 N_("Attempt to support traditional K&R style C") },
1205 { "-fnotraditional", "" },
1206 { "-fno-traditional", "" },
1210 N_("Do not recognize the 'asm' keyword") },
1211 { "-fbuiltin", "" },
1213 N_("Do not recognize any built in functions") },
1215 N_("Assume normal C execution environment") },
1216 { "-fno-hosted", "" },
1218 N_("Assume that standard libraries & main might not exist") },
1219 { "-fno-freestanding", "" },
1220 { "-fcond-mismatch",
1221 N_("Allow different types as args of ? operator") },
1222 { "-fno-cond-mismatch", "" },
1223 { "-fdollars-in-identifiers",
1224 N_("Allow the use of $ inside identifiers") },
1225 { "-fno-dollars-in-identifiers", "" },
1226 { "-fpreprocessed", "" },
1227 { "-fno-preprocessed", "" },
1229 N_("Use the same size for double as for float") },
1230 { "-fno-short-double", "" },
1232 N_("Use the smallest fitting integer to hold enums") },
1233 { "-fno-short-enums", "" },
1235 N_("Override the underlying type for wchar_t to `unsigned short'") },
1236 { "-fno-short-wchar", "" },
1239 N_("Enable most warning messages") },
1240 { "-Wbad-function-cast",
1241 N_("Warn about casting functions to incompatible types") },
1242 { "-Wno-bad-function-cast", "" },
1243 { "-Wno-missing-noreturn", "" },
1244 { "-Wmissing-format-attribute",
1245 N_("Warn about functions which might be candidates for format attributes") },
1246 { "-Wno-missing-format-attribute", "" },
1248 N_("Warn about casts which discard qualifiers") },
1249 { "-Wno-cast-qual", "" },
1250 { "-Wchar-subscripts",
1251 N_("Warn about subscripts whose type is 'char'") },
1252 { "-Wno-char-subscripts", "" },
1254 N_("Warn if nested comments are detected") },
1255 { "-Wno-comment", "" },
1257 N_("Warn if nested comments are detected") },
1258 { "-Wno-comments", "" },
1260 N_("Warn about possibly confusing type conversions") },
1261 { "-Wno-conversion", "" },
1263 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1264 { "-Wno-format", "" },
1265 { "-Wformat-y2k", "" },
1266 { "-Wno-format-y2k",
1267 N_("Don't warn about strftime formats yielding 2 digit years") },
1268 { "-Wformat-extra-args", "" },
1269 { "-Wno-format-extra-args",
1270 N_("Don't warn about too many arguments to format functions") },
1271 { "-Wformat-nonliteral",
1272 N_("Warn about non-string-literal format strings") },
1273 { "-Wno-format-nonliteral", "" },
1274 { "-Wformat-security",
1275 N_("Warn about possible security problems with format functions") },
1276 { "-Wno-format-security", "" },
1277 { "-Wimplicit-function-declaration",
1278 N_("Warn about implicit function declarations") },
1279 { "-Wno-implicit-function-declaration", "" },
1280 { "-Werror-implicit-function-declaration", "" },
1282 N_("Warn when a declaration does not specify a type") },
1283 { "-Wno-implicit-int", "" },
1284 { "-Wimplicit", "" },
1285 { "-Wno-implicit", "" },
1287 N_("Warn about the use of the #import directive") },
1288 { "-Wno-import", "" },
1289 { "-Wlong-long","" },
1291 N_("Do not warn about using 'long long' when -pedantic") },
1293 N_("Warn about suspicious declarations of main") },
1294 { "-Wno-main", "" },
1295 { "-Wmissing-braces",
1296 N_("Warn about possibly missing braces around initializers") },
1297 { "-Wno-missing-braces", "" },
1298 { "-Wmissing-declarations",
1299 N_("Warn about global funcs without previous declarations") },
1300 { "-Wno-missing-declarations", "" },
1301 { "-Wmissing-prototypes",
1302 N_("Warn about global funcs without prototypes") },
1303 { "-Wno-missing-prototypes", "" },
1305 N_("Warn about use of multicharacter literals") },
1306 { "-Wno-multichar", "" },
1307 { "-Wnested-externs",
1308 N_("Warn about externs not at file scope level") },
1309 { "-Wno-nested-externs", "" },
1311 N_("Warn about possible missing parentheses") },
1312 { "-Wno-parentheses", "" },
1313 { "-Wsequence-point",
1314 N_("Warn about possible violations of sequence point rules") },
1315 { "-Wno-sequence-point", "" },
1316 { "-Wpointer-arith",
1317 N_("Warn about function pointer arithmetic") },
1318 { "-Wno-pointer-arith", "" },
1319 { "-Wredundant-decls",
1320 N_("Warn about multiple declarations of the same object") },
1321 { "-Wno-redundant-decls", "" },
1323 N_("Warn about signed/unsigned comparisons") },
1324 { "-Wno-sign-compare", "" },
1326 N_("Warn about testing equality of floating point numbers") },
1327 { "-Wno-float-equal", "" },
1328 { "-Wunknown-pragmas",
1329 N_("Warn about unrecognized pragmas") },
1330 { "-Wno-unknown-pragmas", "" },
1331 { "-Wstrict-prototypes",
1332 N_("Warn about non-prototyped function decls") },
1333 { "-Wno-strict-prototypes", "" },
1335 N_("Warn about constructs whose meaning change in ISO C") },
1336 { "-Wno-traditional", "" },
1338 N_("Warn when trigraphs are encountered") },
1339 { "-Wno-trigraphs", "" },
1341 { "-Wno-undef", "" },
1342 { "-Wwrite-strings",
1343 N_("Mark strings as 'const char *'") },
1344 { "-Wno-write-strings", "" },
1346 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1348 #include "options.h"
1352 /* Here is a table, controlled by the tm.h file, listing each -m switch
1353 and which bits in `target_switches' it should set or clear.
1354 If VALUE is positive, it is bits to set.
1355 If VALUE is negative, -VALUE is bits to clear.
1356 (The sign bit is not used so there is no confusion.) */
1360 const char *const name
;
1362 const char *const description
;
1364 target_switches
[] = TARGET_SWITCHES
;
1366 /* This table is similar, but allows the switch to have a value. */
1368 #ifdef TARGET_OPTIONS
1371 const char *const prefix
;
1372 const char **const variable
;
1373 const char *const description
;
1375 target_options
[] = TARGET_OPTIONS
;
1378 /* Options controlling warnings. */
1380 /* Don't print warning messages. -w. */
1382 int inhibit_warnings
= 0;
1384 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1386 int warn_system_headers
= 0;
1388 /* Print various extra warnings. -W. */
1390 int extra_warnings
= 0;
1392 /* Treat warnings as errors. -Werror. */
1394 int warnings_are_errors
= 0;
1396 /* Nonzero to warn about unused variables, functions et.al. */
1398 int warn_unused_function
;
1399 int warn_unused_label
;
1400 int warn_unused_parameter
;
1401 int warn_unused_variable
;
1402 int warn_unused_value
;
1404 /* Nonzero to warn about code which is never reached. */
1406 int warn_notreached
;
1408 /* Nonzero to warn about variables used before they are initialized. */
1410 int warn_uninitialized
;
1412 /* Nonzero means warn about all declarations which shadow others. */
1416 /* Warn if a switch on an enum fails to have a case for every enum value. */
1420 /* Nonzero means warn about function definitions that default the return type
1421 or that use a null return and have a return-type other than void. */
1423 int warn_return_type
;
1425 /* Nonzero means warn about pointer casts that increase the required
1426 alignment of the target type (and might therefore lead to a crash
1427 due to a misaligned access). */
1429 int warn_cast_align
;
1431 /* Nonzero means warn about any objects definitions whose size is larger
1432 than N bytes. Also want about function definitions whose returned
1433 values are larger than N bytes. The value N is in `larger_than_size'. */
1435 int warn_larger_than
;
1436 HOST_WIDE_INT larger_than_size
;
1438 /* Nonzero means warn if inline function is too large. */
1442 /* Warn if a function returns an aggregate,
1443 since there are often incompatible calling conventions for doing this. */
1445 int warn_aggregate_return
;
1447 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1451 /* Warn when gcc pads a structure to an alignment boundary. */
1455 /* Warn when an optimization pass is disabled. */
1457 int warn_disabled_optimization
;
1459 /* Warn about functions which might be candidates for attribute noreturn. */
1461 int warn_missing_noreturn
;
1463 /* Nonzero means warn about uses of __attribute__((deprecated))
1466 int warn_deprecated_decl
= 1;
1468 /* Likewise for -W. */
1470 static const lang_independent_options W_options
[] =
1472 {"unused-function", &warn_unused_function
, 1,
1473 N_("Warn when a function is unused") },
1474 {"unused-label", &warn_unused_label
, 1,
1475 N_("Warn when a label is unused") },
1476 {"unused-parameter", &warn_unused_parameter
, 1,
1477 N_("Warn when a function parameter is unused") },
1478 {"unused-variable", &warn_unused_variable
, 1,
1479 N_("Warn when a variable is unused") },
1480 {"unused-value", &warn_unused_value
, 1,
1481 N_("Warn when an expression value is unused") },
1482 {"system-headers", &warn_system_headers
, 1,
1483 N_("Do not suppress warnings from system headers") },
1484 {"error", &warnings_are_errors
, 1,
1485 N_("Treat all warnings as errors") },
1486 {"shadow", &warn_shadow
, 1,
1487 N_("Warn when one local variable shadows another") },
1488 {"switch", &warn_switch
, 1,
1489 N_("Warn about enumerated switches missing a specific case") },
1490 {"aggregate-return", &warn_aggregate_return
, 1,
1491 N_("Warn about returning structures, unions or arrays") },
1492 {"cast-align", &warn_cast_align
, 1,
1493 N_("Warn about pointer casts which increase alignment") },
1494 {"unreachable-code", &warn_notreached
, 1,
1495 N_("Warn about code that will never be executed") },
1496 {"uninitialized", &warn_uninitialized
, 1,
1497 N_("Warn about uninitialized automatic variables") },
1498 {"inline", &warn_inline
, 1,
1499 N_("Warn when an inlined function cannot be inlined") },
1500 {"packed", &warn_packed
, 1,
1501 N_("Warn when the packed attribute has no effect on struct layout") },
1502 {"padded", &warn_padded
, 1,
1503 N_("Warn when padding is required to align struct members") },
1504 {"disabled-optimization", &warn_disabled_optimization
, 1,
1505 N_("Warn when an optimization pass is disabled") },
1506 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1507 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1508 {"missing-noreturn", &warn_missing_noreturn
, 1,
1509 N_("Warn about functions which might be candidates for attribute noreturn") }
1513 set_Wunused (setting
)
1516 warn_unused_function
= setting
;
1517 warn_unused_label
= setting
;
1518 /* Unused function parameter warnings are reported when either ``-W
1519 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1520 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1522 warn_unused_parameter
= 0;
1523 else if (!warn_unused_parameter
)
1524 warn_unused_parameter
= -1;
1525 warn_unused_variable
= setting
;
1526 warn_unused_value
= setting
;
1529 /* The following routines are useful in setting all the flags that
1530 -ffast-math and -fno-fast-math imply. */
1533 set_fast_math_flags ()
1535 flag_trapping_math
= 0;
1536 flag_unsafe_math_optimizations
= 1;
1537 flag_errno_math
= 0;
1541 set_no_fast_math_flags ()
1543 flag_trapping_math
= 1;
1544 flag_unsafe_math_optimizations
= 0;
1545 flag_errno_math
= 1;
1549 /* Output files for assembler code (real compiler output)
1550 and debugging dumps. */
1553 FILE *aux_info_file
;
1554 FILE *rtl_dump_file
= NULL
;
1556 /* Decode the string P as an integral parameter.
1557 If the string is indeed an integer return its numeric value else
1558 issue an Invalid Option error for the option PNAME and return DEFVAL.
1559 If PNAME is zero just return DEFVAL, do not call error. */
1562 read_integral_parameter (p
, pname
, defval
)
1567 const char *endp
= p
;
1571 if (ISDIGIT (*endp
))
1580 error ("invalid option `%s'", pname
);
1588 /* This is the default decl_printable_name function. */
1591 decl_name (decl
, verbosity
)
1593 int verbosity ATTRIBUTE_UNUSED
;
1595 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1599 /* This calls abort and is used to avoid problems when abort if a macro.
1600 It is used when we need to pass the address of abort. */
1608 /* When `malloc.c' is compiled with `rcheck' defined,
1609 it calls this function to report clobberage. */
1613 const char *s ATTRIBUTE_UNUSED
;
1618 /* Return the logarithm of X, base 2, considering X unsigned,
1619 if X is a power of 2. Otherwise, returns -1.
1621 This should be used via the `exact_log2' macro. */
1625 unsigned HOST_WIDE_INT x
;
1628 /* Test for 0 or a power of 2. */
1629 if (x
== 0 || x
!= (x
& -x
))
1631 while ((x
>>= 1) != 0)
1636 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1637 If X is 0, return -1.
1639 This should be used via the floor_log2 macro. */
1643 unsigned HOST_WIDE_INT x
;
1652 static int float_handler_set
;
1654 jmp_buf float_handler
;
1656 /* Signals actually come here. */
1659 float_signal (signo
)
1660 /* If this is missing, some compilers complain. */
1661 int signo ATTRIBUTE_UNUSED
;
1663 if (float_handled
== 0)
1664 crash_signal (signo
);
1667 /* On System-V derived systems, we must reinstall the signal handler.
1668 This is harmless on BSD-derived systems. */
1669 signal (SIGFPE
, float_signal
);
1670 longjmp (float_handler
, 1);
1673 /* Specify where to longjmp to when a floating arithmetic error happens.
1674 If HANDLER is 0, it means don't handle the errors any more. */
1677 set_float_handler (handler
)
1680 float_handled
= (handler
!= 0);
1682 memcpy (float_handler
, handler
, sizeof (float_handler
));
1684 if (float_handled
&& ! float_handler_set
)
1686 signal (SIGFPE
, float_signal
);
1687 float_handler_set
= 1;
1691 /* This is a wrapper function for code which might elicit an
1692 arithmetic exception. That code should be passed in as a function
1693 pointer FN, and one argument DATA. DATA is usually a struct which
1694 contains the real input and output for function FN. This function
1695 returns 0 (failure) if longjmp was called (i.e. an exception
1696 occurred.) It returns 1 (success) otherwise. */
1699 do_float_handler (fn
, data
)
1700 void (*fn
) PARAMS ((PTR
));
1707 /* We got here via longjmp () caused by an exception in function
1709 set_float_handler (NULL
);
1713 set_float_handler (buf
);
1715 set_float_handler (NULL
);
1719 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1720 into ICE messages, which is much more user friendly. */
1723 crash_signal (signo
)
1726 internal_error ("internal error: %s", strsignal (signo
));
1729 /* Strip off a legitimate source ending from the input string NAME of
1730 length LEN. Rather than having to know the names used by all of
1731 our front ends, we strip off an ending of a period followed by
1732 up to five characters. (Java uses ".class".) */
1735 strip_off_ending (name
, len
)
1740 for (i
= 2; i
< 6 && len
> i
; i
++)
1742 if (name
[len
- i
] == '.')
1744 name
[len
- i
] = '\0';
1750 /* Output a quoted string. */
1753 output_quoted_string (asm_file
, string
)
1757 #ifdef OUTPUT_QUOTED_STRING
1758 OUTPUT_QUOTED_STRING (asm_file
, string
);
1762 putc ('\"', asm_file
);
1763 while ((c
= *string
++) != 0)
1765 if (c
== '\"' || c
== '\\')
1766 putc ('\\', asm_file
);
1769 putc ('\"', asm_file
);
1773 /* Output a file name in the form wanted by System V. */
1776 output_file_directive (asm_file
, input_name
)
1778 const char *input_name
;
1780 int len
= strlen (input_name
);
1781 const char *na
= input_name
+ len
;
1783 /* NA gets INPUT_NAME sans directory names. */
1784 while (na
> input_name
)
1786 if (IS_DIR_SEPARATOR (na
[-1]))
1791 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1792 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1794 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1795 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1797 fprintf (asm_file
, "\t.file\t");
1798 output_quoted_string (asm_file
, na
);
1799 fputc ('\n', asm_file
);
1804 /* Routine to open a dump file. Return true if the dump file is enabled. */
1807 open_dump_file (index
, decl
)
1808 enum dump_file_index index
;
1812 const char *open_arg
;
1815 if (! dump_file
[index
].enabled
)
1818 timevar_push (TV_DUMP
);
1819 if (rtl_dump_file
!= NULL
)
1820 fclose (rtl_dump_file
);
1822 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1824 if (! dump_file
[index
].initialized
)
1826 /* If we've not initialized the files, do so now. */
1827 if (graph_dump_format
!= no_graph
1828 && dump_file
[index
].graph_dump_p
)
1830 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1831 clean_graph_dump_file (dump_base_name
, dump_name
);
1834 dump_file
[index
].initialized
= 1;
1840 dump_name
= concat (dump_base_name
, seq
,
1841 dump_file
[index
].extension
, NULL
);
1843 rtl_dump_file
= fopen (dump_name
, open_arg
);
1844 if (rtl_dump_file
== NULL
)
1845 fatal_io_error ("can't open %s", dump_name
);
1850 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1851 decl_printable_name (decl
, 2));
1853 timevar_pop (TV_DUMP
);
1857 /* Routine to close a dump file. */
1860 close_dump_file (index
, func
, insns
)
1861 enum dump_file_index index
;
1862 void (*func
) PARAMS ((FILE *, rtx
));
1865 if (! rtl_dump_file
)
1868 timevar_push (TV_DUMP
);
1870 && graph_dump_format
!= no_graph
1871 && dump_file
[index
].graph_dump_p
)
1876 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1877 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1878 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1883 func (rtl_dump_file
, insns
);
1885 fflush (rtl_dump_file
);
1886 fclose (rtl_dump_file
);
1888 rtl_dump_file
= NULL
;
1889 timevar_pop (TV_DUMP
);
1892 /* Do any final processing required for the declarations in VEC, of
1893 which there are LEN. We write out inline functions and variables
1894 that have been deferred until this point, but which are required.
1895 Returns non-zero if anything was put out. */
1898 wrapup_global_declarations (vec
, len
)
1905 int output_something
= 0;
1907 for (i
= 0; i
< len
; i
++)
1911 /* We're not deferring this any longer. */
1912 DECL_DEFER_OUTPUT (decl
) = 0;
1914 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1915 && incomplete_decl_finalize_hook
!= 0)
1916 (*incomplete_decl_finalize_hook
) (decl
);
1919 /* Now emit any global variables or functions that we have been
1920 putting off. We need to loop in case one of the things emitted
1921 here references another one which comes earlier in the list. */
1925 for (i
= 0; i
< len
; i
++)
1929 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1932 /* Don't write out static consts, unless we still need them.
1934 We also keep static consts if not optimizing (for debugging),
1935 unless the user specified -fno-keep-static-consts.
1936 ??? They might be better written into the debug information.
1937 This is possible when using DWARF.
1939 A language processor that wants static constants to be always
1940 written out (even if it is not used) is responsible for
1941 calling rest_of_decl_compilation itself. E.g. the C front-end
1942 calls rest_of_decl_compilation from finish_decl.
1943 One motivation for this is that is conventional in some
1944 environments to write things like:
1945 static const char rcsid[] = "... version string ...";
1946 intending to force the string to be in the executable.
1948 A language processor that would prefer to have unneeded
1949 static constants "optimized away" would just defer writing
1950 them out until here. E.g. C++ does this, because static
1951 constants are often defined in header files.
1953 ??? A tempting alternative (for both C and C++) would be
1954 to force a constant to be written if and only if it is
1955 defined in a main file, as opposed to an include file. */
1957 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1958 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1959 && !DECL_COMDAT (decl
))
1961 && flag_keep_static_consts
1962 && !DECL_ARTIFICIAL (decl
))
1963 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1966 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1969 if (TREE_CODE (decl
) == FUNCTION_DECL
1970 && DECL_INITIAL (decl
) != 0
1971 && DECL_SAVED_INSNS (decl
) != 0
1972 && (flag_keep_inline_functions
1973 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1974 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1977 output_inline_function (decl
);
1982 output_something
= 1;
1986 return output_something
;
1989 /* Issue appropriate warnings for the global declarations in VEC (of
1990 which there are LEN). Output debugging information for them. */
1993 check_global_declarations (vec
, len
)
2000 for (i
= 0; i
< len
; i
++)
2004 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2005 && ! TREE_ASM_WRITTEN (decl
))
2006 /* Cancel the RTL for this decl so that, if debugging info
2007 output for global variables is still to come,
2008 this one will be omitted. */
2009 SET_DECL_RTL (decl
, NULL_RTX
);
2011 /* Warn about any function
2012 declared static but not defined.
2013 We don't warn about variables,
2014 because many programs have static variables
2015 that exist only to get some text into the object file. */
2016 if (TREE_CODE (decl
) == FUNCTION_DECL
2017 && (warn_unused_function
2018 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2019 && DECL_INITIAL (decl
) == 0
2020 && DECL_EXTERNAL (decl
)
2021 && ! DECL_ARTIFICIAL (decl
)
2022 && ! TREE_PUBLIC (decl
))
2024 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2025 pedwarn_with_decl (decl
,
2026 "`%s' used but never defined");
2028 warning_with_decl (decl
,
2029 "`%s' declared `static' but never defined");
2030 /* This symbol is effectively an "extern" declaration now. */
2031 TREE_PUBLIC (decl
) = 1;
2032 assemble_external (decl
);
2035 /* Warn about static fns or vars defined but not used,
2036 but not about inline functions or static consts
2037 since defining those in header files is normal practice. */
2038 if (((warn_unused_function
2039 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2040 || (warn_unused_variable
2041 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2042 && ! DECL_IN_SYSTEM_HEADER (decl
)
2043 && ! DECL_EXTERNAL (decl
)
2044 && ! TREE_PUBLIC (decl
)
2045 && ! TREE_USED (decl
)
2046 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2047 /* The TREE_USED bit for file-scope decls
2048 is kept in the identifier, to handle multiple
2049 external decls in different scopes. */
2050 && ! TREE_USED (DECL_NAME (decl
)))
2051 warning_with_decl (decl
, "`%s' defined but not used");
2053 timevar_push (TV_SYMOUT
);
2054 (*debug_hooks
->global_decl
) (decl
);
2055 timevar_pop (TV_SYMOUT
);
2059 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2060 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2061 INPUT_FILENAME and LINENO accordingly. */
2064 push_srcloc (file
, line
)
2068 struct file_stack
*fs
;
2070 if (input_file_stack
)
2072 input_file_stack
->name
= input_filename
;
2073 input_file_stack
->line
= lineno
;
2076 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2077 fs
->name
= input_filename
= file
;
2078 fs
->line
= lineno
= line
;
2079 fs
->indent_level
= 0;
2080 fs
->next
= input_file_stack
;
2081 input_file_stack
= fs
;
2082 input_file_stack_tick
++;
2085 /* Pop the top entry off the stack of presently open source files.
2086 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2092 struct file_stack
*fs
;
2094 fs
= input_file_stack
;
2095 input_file_stack
= fs
->next
;
2097 input_file_stack_tick
++;
2098 /* The initial source file is never popped. */
2099 if (!input_file_stack
)
2101 input_filename
= input_file_stack
->name
;
2102 lineno
= input_file_stack
->line
;
2105 /* Compile an entire translation unit. Write a file of assembly
2106 output and various debugging dumps. */
2113 /* Initialize yet another pass. */
2115 init_final (main_input_filename
);
2116 init_branch_prob (dump_base_name
);
2118 timevar_push (TV_PARSE
);
2120 /* Call the parser, which parses the entire file
2121 (calling rest_of_compilation for each function). */
2124 /* In case there were missing block closers,
2125 get us back to the global binding level. */
2126 (*lang_hooks
.clear_binding_stack
) ();
2128 /* Compilation is now finished except for writing
2129 what's left of the symbol table output. */
2131 timevar_pop (TV_PARSE
);
2133 if (flag_syntax_only
)
2136 globals
= getdecls ();
2138 /* Really define vars that have had only a tentative definition.
2139 Really output inline functions that must actually be callable
2140 and have not been output so far. */
2143 int len
= list_length (globals
);
2144 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2148 /* Process the decls in reverse order--earliest first.
2149 Put them into VEC from back to front, then take out from front. */
2151 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2152 vec
[len
- i
- 1] = decl
;
2154 wrapup_global_declarations (vec
, len
);
2156 /* This must occur after the loop to output deferred functions. Else
2157 the profiler initializer would not be emitted if all the functions
2158 in this compilation unit were deferred.
2160 output_func_start_profiler can not cause any additional functions or
2161 data to need to be output, so it need not be in the deferred function
2163 output_func_start_profiler ();
2165 check_global_declarations (vec
, len
);
2171 /* Write out any pending weak symbol declarations. */
2175 /* Do dbx symbols. */
2176 timevar_push (TV_SYMOUT
);
2178 #ifdef DWARF2_UNWIND_INFO
2179 if (dwarf2out_do_frame ())
2180 dwarf2out_frame_finish ();
2183 (*debug_hooks
->finish
) (main_input_filename
);
2184 timevar_pop (TV_SYMOUT
);
2186 /* Output some stuff at end of file if nec. */
2188 dw2_output_indirect_constants ();
2190 end_final (dump_base_name
);
2192 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2194 timevar_push (TV_DUMP
);
2195 open_dump_file (DFI_bp
, NULL
);
2199 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2200 timevar_pop (TV_DUMP
);
2204 ASM_FILE_END (asm_out_file
);
2207 /* Attach a special .ident directive to the end of the file to identify
2208 the version of GCC which compiled this code. The format of the .ident
2209 string is patterned after the ones produced by native SVR4 compilers. */
2212 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2213 IDENT_ASM_OP
, version_string
);
2216 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2218 timevar_push (TV_DUMP
);
2219 dump_combine_total_stats (rtl_dump_file
);
2220 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2221 timevar_pop (TV_DUMP
);
2225 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2226 and TYPE_DECL nodes.
2228 This does nothing for local (non-static) variables, unless the
2229 variable is a register variable with an ASMSPEC. In that case, or
2230 if the variable is not an automatic, it sets up the RTL and
2231 outputs any assembler code (label definition, storage allocation
2232 and initialization).
2234 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2235 the assembler symbol name to be used. TOP_LEVEL is nonzero
2236 if this declaration is not within a function. */
2239 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2241 const char *asmspec
;
2245 /* Declarations of variables, and of functions defined elsewhere. */
2247 /* The most obvious approach, to put an #ifndef around where
2248 this macro is used, doesn't work since it's inside a macro call. */
2249 #ifndef ASM_FINISH_DECLARE_OBJECT
2250 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2253 /* Forward declarations for nested functions are not "external",
2254 but we need to treat them as if they were. */
2255 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2256 || TREE_CODE (decl
) == FUNCTION_DECL
)
2258 timevar_push (TV_VARCONST
);
2260 make_decl_rtl (decl
, asmspec
);
2261 /* Don't output anything
2262 when a tentative file-scope definition is seen.
2263 But at end of compilation, do output code for them. */
2264 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2265 assemble_variable (decl
, top_level
, at_end
, 0);
2266 if (decl
== last_assemble_variable_decl
)
2268 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2271 timevar_pop (TV_VARCONST
);
2273 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2275 if (decode_reg_name (asmspec
) >= 0)
2277 SET_DECL_RTL (decl
, NULL_RTX
);
2278 make_decl_rtl (decl
, asmspec
);
2282 error ("invalid register name `%s' for register variable", asmspec
);
2283 DECL_REGISTER (decl
) = 0;
2288 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2289 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2290 && TREE_CODE (decl
) == TYPE_DECL
)
2292 timevar_push (TV_SYMOUT
);
2293 dbxout_symbol (decl
, 0);
2294 timevar_pop (TV_SYMOUT
);
2297 #ifdef SDB_DEBUGGING_INFO
2298 else if (write_symbols
== SDB_DEBUG
&& top_level
2299 && TREE_CODE (decl
) == TYPE_DECL
)
2301 timevar_push (TV_SYMOUT
);
2302 sdbout_symbol (decl
, 0);
2303 timevar_pop (TV_SYMOUT
);
2308 /* Called after finishing a record, union or enumeral type. */
2311 rest_of_type_compilation (type
, toplev
)
2312 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2316 tree type ATTRIBUTE_UNUSED
;
2317 int toplev ATTRIBUTE_UNUSED
;
2320 timevar_push (TV_SYMOUT
);
2321 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2322 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2323 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2325 #ifdef SDB_DEBUGGING_INFO
2326 if (write_symbols
== SDB_DEBUG
)
2327 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2329 #ifdef DWARF2_DEBUGGING_INFO
2330 if ((write_symbols
== DWARF2_DEBUG
2331 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2333 dwarf2out_decl (TYPE_STUB_DECL (type
));
2335 timevar_pop (TV_SYMOUT
);
2338 /* This is called from finish_function (within yyparse)
2339 after each top-level definition is parsed.
2340 It is supposed to compile that function or variable
2341 and output the assembler code for it.
2342 After we return, the tree storage is freed. */
2345 rest_of_compilation (decl
)
2351 int rebuild_label_notes_after_reload
;
2352 int register_life_up_to_date
;
2354 timevar_push (TV_REST_OF_COMPILATION
);
2356 /* Now that we're out of the frontend, we shouldn't have any more
2357 CONCATs anywhere. */
2358 generating_concat_p
= 0;
2360 /* When processing delayed functions, prepare_function_start() won't
2361 have been run to re-initialize it. */
2362 cse_not_expected
= ! optimize
;
2364 /* First, make sure that NOTE_BLOCK is set correctly for each
2365 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2366 if (!cfun
->x_whole_function_mode_p
)
2369 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2370 tree in sensible shape. So, we just recalculate it here. */
2371 if (cfun
->x_whole_function_mode_p
)
2376 /* If we are reconsidering an inline function
2377 at the end of compilation, skip the stuff for making it inline. */
2379 if (DECL_SAVED_INSNS (decl
) == 0)
2385 /* If this is nested inside an inlined external function, pretend
2386 it was only declared. Since we cannot inline such functions,
2387 generating code for this one is not only not necessary but will
2388 confuse some debugging output writers. */
2389 for (parent
= DECL_CONTEXT (current_function_decl
);
2390 parent
!= NULL_TREE
;
2391 parent
= get_containing_scope (parent
))
2392 if (TREE_CODE (parent
) == FUNCTION_DECL
2393 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2395 DECL_INITIAL (decl
) = 0;
2396 goto exit_rest_of_compilation
;
2399 /* If requested, consider whether to make this function inline. */
2400 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2401 || flag_inline_functions
)
2403 timevar_push (TV_INTEGRATION
);
2404 lose
= function_cannot_inline_p (decl
);
2405 timevar_pop (TV_INTEGRATION
);
2406 if (lose
|| ! optimize
)
2408 if (warn_inline
&& DECL_INLINE (decl
))
2409 warning_with_decl (decl
, lose
);
2410 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2411 /* Don't really compile an extern inline function.
2412 If we can't make it inline, pretend
2413 it was only declared. */
2414 if (DECL_EXTERNAL (decl
))
2416 DECL_INITIAL (decl
) = 0;
2417 goto exit_rest_of_compilation
;
2421 /* ??? Note that this has the effect of making it look
2422 like "inline" was specified for a function if we choose
2423 to inline it. This isn't quite right, but it's
2424 probably not worth the trouble to fix. */
2425 inlinable
= DECL_INLINE (decl
) = 1;
2428 insns
= get_insns ();
2430 /* Dump the rtl code if we are dumping rtl. */
2432 if (open_dump_file (DFI_rtl
, decl
))
2434 if (DECL_SAVED_INSNS (decl
))
2435 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2436 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2439 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2440 sorts of eh initialization. Delay this until after the
2441 initial rtl dump so that we can see the original nesting. */
2442 convert_from_eh_region_ranges ();
2444 /* If function is inline, and we don't yet know whether to
2445 compile it by itself, defer decision till end of compilation.
2446 finish_compilation will call rest_of_compilation again
2447 for those functions that need to be output. Also defer those
2448 functions that we are supposed to defer. */
2451 || (DECL_INLINE (decl
)
2452 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2453 && ! flag_keep_inline_functions
)
2454 || DECL_EXTERNAL (decl
))))
2455 DECL_DEFER_OUTPUT (decl
) = 1;
2457 if (DECL_INLINE (decl
))
2458 /* DWARF wants separate debugging info for abstract and
2459 concrete instances of all inline functions, including those
2460 declared inline but not inlined, and those inlined even
2461 though they weren't declared inline. Conveniently, that's
2462 what DECL_INLINE means at this point. */
2463 (*debug_hooks
->deferred_inline_function
) (decl
);
2465 if (DECL_DEFER_OUTPUT (decl
))
2467 /* If -Wreturn-type, we have to do a bit of compilation. We just
2468 want to call cleanup the cfg to figure out whether or not we can
2469 fall off the end of the function; we do the minimum amount of
2470 work necessary to make that safe. */
2471 if (warn_return_type
)
2473 int saved_optimize
= optimize
;
2476 rebuild_jump_labels (insns
);
2477 find_exception_handler_labels ();
2478 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2479 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2480 optimize
= saved_optimize
;
2482 /* CFG is no longer maintained up-to-date. */
2483 free_bb_for_insn ();
2486 current_function_nothrow
= nothrow_function_p ();
2487 if (current_function_nothrow
)
2488 /* Now we know that this can't throw; set the flag for the benefit
2489 of other functions later in this translation unit. */
2490 TREE_NOTHROW (current_function_decl
) = 1;
2492 timevar_push (TV_INTEGRATION
);
2493 save_for_inline (decl
);
2494 timevar_pop (TV_INTEGRATION
);
2495 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2496 goto exit_rest_of_compilation
;
2499 /* If specified extern inline but we aren't inlining it, we are
2500 done. This goes for anything that gets here with DECL_EXTERNAL
2501 set, not just things with DECL_INLINE. */
2502 if (DECL_EXTERNAL (decl
))
2503 goto exit_rest_of_compilation
;
2506 /* If we're emitting a nested function, make sure its parent gets
2507 emitted as well. Doing otherwise confuses debug info. */
2510 for (parent
= DECL_CONTEXT (current_function_decl
);
2511 parent
!= NULL_TREE
;
2512 parent
= get_containing_scope (parent
))
2513 if (TREE_CODE (parent
) == FUNCTION_DECL
)
2514 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
2517 /* We are now committed to emitting code for this function. Do any
2518 preparation, such as emitting abstract debug info for the inline
2519 before it gets mangled by optimization. */
2520 if (DECL_INLINE (decl
))
2521 (*debug_hooks
->outlining_inline_function
) (decl
);
2523 /* Remove any notes we don't need. That will make iterating
2524 over the instruction sequence faster, and allow the garbage
2525 collector to reclaim the memory used by the notes. */
2526 remove_unnecessary_notes ();
2531 /* Initialize some variables used by the optimizers. */
2532 init_function_for_compilation ();
2534 if (! DECL_DEFER_OUTPUT (decl
))
2535 TREE_ASM_WRITTEN (decl
) = 1;
2537 /* Now that integrate will no longer see our rtl, we need not
2538 distinguish between the return value of this function and the
2539 return value of called functions. Also, we can remove all SETs
2540 of subregs of hard registers; they are only here because of
2541 integrate. Also, we can now initialize pseudos intended to
2542 carry magic hard reg data throughout the function. */
2543 rtx_equal_function_value_matters
= 0;
2544 purge_hard_subreg_sets (get_insns ());
2545 emit_initial_value_sets ();
2547 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2548 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2549 goto exit_rest_of_compilation
;
2551 /* We may have potential sibling or tail recursion sites. Select one
2552 (of possibly multiple) methods of performing the call. */
2553 if (flag_optimize_sibling_calls
)
2555 timevar_push (TV_JUMP
);
2556 open_dump_file (DFI_sibling
, decl
);
2558 optimize_sibling_and_tail_recursive_calls ();
2560 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2561 timevar_pop (TV_JUMP
);
2564 /* Complete generation of exception handling code. */
2565 find_exception_handler_labels ();
2568 timevar_push (TV_JUMP
);
2569 open_dump_file (DFI_eh
, decl
);
2571 finish_eh_generation ();
2573 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2574 timevar_pop (TV_JUMP
);
2578 /* If we are doing position-independent code generation, now
2579 is the time to output special prologues and epilogues.
2580 We do not want to do this earlier, because it just clutters
2581 up inline functions with meaningless insns. */
2586 insns
= get_insns ();
2588 /* Copy any shared structure that should not be shared. */
2589 unshare_all_rtl (current_function_decl
, insns
);
2591 #ifdef SETJMP_VIA_SAVE_AREA
2592 /* This must be performed before virtual register instantiation. */
2593 if (current_function_calls_alloca
)
2594 optimize_save_area_alloca (insns
);
2597 /* Instantiate all virtual registers. */
2598 instantiate_virtual_regs (current_function_decl
, insns
);
2600 open_dump_file (DFI_jump
, decl
);
2602 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2603 are initialized and to compute whether control can drop off the end
2606 timevar_push (TV_JUMP
);
2607 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2608 before jump optimization switches branch directions. */
2609 expected_value_to_br_prob ();
2611 reg_scan (insns
, max_reg_num (), 0);
2612 rebuild_jump_labels (insns
);
2613 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2614 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
);
2616 /* CFG is no longer maintained up-to-date. */
2617 free_bb_for_insn ();
2618 copy_loop_headers (insns
);
2619 purge_line_number_notes (insns
);
2621 timevar_pop (TV_JUMP
);
2623 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2624 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2626 close_dump_file (DFI_jump
, print_rtl
, insns
);
2627 goto exit_rest_of_compilation
;
2630 /* Long term, this should probably move before the jump optimizer too,
2631 but I didn't want to disturb the rtl_dump_and_exit and related
2632 stuff at this time. */
2633 if (optimize
> 0 && flag_ssa
)
2635 /* Convert to SSA form. */
2637 timevar_push (TV_TO_SSA
);
2638 open_dump_file (DFI_ssa
, decl
);
2640 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2641 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2644 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2645 timevar_pop (TV_TO_SSA
);
2647 /* Perform sparse conditional constant propagation, if requested. */
2650 timevar_push (TV_SSA_CCP
);
2651 open_dump_file (DFI_ssa_ccp
, decl
);
2655 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2656 timevar_pop (TV_SSA_CCP
);
2659 /* It would be useful to cleanup the CFG at this point, but block
2660 merging and possibly other transformations might leave a PHI
2661 node in the middle of a basic block, which is a strict no-no. */
2663 /* The SSA implementation uses basic block numbers in its phi
2664 nodes. Thus, changing the control-flow graph or the basic
2665 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2666 may cause problems. */
2670 /* Remove dead code. */
2672 timevar_push (TV_SSA_DCE
);
2673 open_dump_file (DFI_ssa_dce
, decl
);
2675 insns
= get_insns ();
2676 ssa_eliminate_dead_code();
2678 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2679 timevar_pop (TV_SSA_DCE
);
2682 /* Convert from SSA form. */
2684 timevar_push (TV_FROM_SSA
);
2685 open_dump_file (DFI_ussa
, decl
);
2687 convert_from_ssa ();
2688 /* New registers have been created. Rescan their usage. */
2689 reg_scan (insns
, max_reg_num (), 1);
2691 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2692 timevar_pop (TV_FROM_SSA
);
2695 /* CFG is no longer maintained up-to-date. */
2696 free_bb_for_insn ();
2699 timevar_push (TV_JUMP
);
2703 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2704 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
2705 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2707 /* ??? Run if-conversion before delete_null_pointer_checks,
2708 since the later does not preserve the CFG. This should
2709 be changed -- no since converting if's that are going to
2711 timevar_push (TV_IFCVT
);
2713 timevar_pop (TV_IFCVT
);
2715 /* CFG is no longer maintained up-to-date. */
2716 free_bb_for_insn ();
2717 /* Try to identify useless null pointer tests and delete them. */
2718 if (flag_delete_null_pointer_checks
)
2719 delete_null_pointer_checks (insns
);
2722 /* Jump optimization, and the removal of NULL pointer checks, may
2723 have reduced the number of instructions substantially. CSE, and
2724 future passes, allocate arrays whose dimensions involve the
2725 maximum instruction UID, so if we can reduce the maximum UID
2726 we'll save big on memory. */
2727 renumber_insns (rtl_dump_file
);
2728 timevar_pop (TV_JUMP
);
2730 close_dump_file (DFI_jump
, print_rtl
, insns
);
2734 /* Perform common subexpression elimination.
2735 Nonzero value from `cse_main' means that jumps were simplified
2736 and some code may now be unreachable, so do
2737 jump optimization again. */
2741 open_dump_file (DFI_cse
, decl
);
2742 timevar_push (TV_CSE
);
2744 reg_scan (insns
, max_reg_num (), 1);
2746 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2748 /* If we are not running more CSE passes, then we are no longer
2749 expecting CSE to be run. But always rerun it in a cheap mode. */
2750 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2752 if (tem
|| optimize
> 1)
2754 timevar_push (TV_JUMP
);
2755 rebuild_jump_labels (insns
);
2756 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2757 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2758 timevar_pop (TV_JUMP
);
2759 /* CFG is no longer maintained up-to-date. */
2760 free_bb_for_insn ();
2763 /* Run this after jump optmizations remove all the unreachable code
2764 so that unreachable code will not keep values live. */
2765 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2767 /* Try to identify useless null pointer tests and delete them. */
2768 if (flag_delete_null_pointer_checks
|| flag_thread_jumps
)
2770 timevar_push (TV_JUMP
);
2771 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2773 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
2774 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2776 if (flag_delete_null_pointer_checks
)
2777 delete_null_pointer_checks (insns
);
2778 /* CFG is no longer maintained up-to-date. */
2779 free_bb_for_insn ();
2780 timevar_pop (TV_JUMP
);
2783 /* The second pass of jump optimization is likely to have
2784 removed a bunch more instructions. */
2785 renumber_insns (rtl_dump_file
);
2787 timevar_pop (TV_CSE
);
2788 close_dump_file (DFI_cse
, print_rtl
, insns
);
2791 open_dump_file (DFI_addressof
, decl
);
2793 purge_addressof (insns
);
2794 reg_scan (insns
, max_reg_num (), 1);
2796 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2800 /* Perform global cse. */
2802 if (optimize
> 0 && flag_gcse
)
2804 int save_csb
, save_cfj
;
2807 timevar_push (TV_GCSE
);
2808 open_dump_file (DFI_gcse
, decl
);
2810 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2811 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2812 tem
= gcse_main (insns
, rtl_dump_file
);
2813 rebuild_jump_labels (insns
);
2815 save_csb
= flag_cse_skip_blocks
;
2816 save_cfj
= flag_cse_follow_jumps
;
2817 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2819 /* CFG is no longer maintained up-to-date. */
2820 free_bb_for_insn ();
2821 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2823 if (flag_expensive_optimizations
)
2825 timevar_push (TV_CSE
);
2826 reg_scan (insns
, max_reg_num (), 1);
2827 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2828 timevar_pop (TV_CSE
);
2829 cse_not_expected
= !flag_rerun_cse_after_loop
;
2832 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2833 things up. Then possibly re-run CSE again. */
2837 timevar_push (TV_JUMP
);
2838 rebuild_jump_labels (insns
);
2839 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2840 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2841 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2842 /* CFG is no longer maintained up-to-date. */
2843 free_bb_for_insn ();
2844 timevar_pop (TV_JUMP
);
2846 if (flag_expensive_optimizations
)
2848 timevar_push (TV_CSE
);
2849 reg_scan (insns
, max_reg_num (), 1);
2850 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2851 timevar_pop (TV_CSE
);
2855 close_dump_file (DFI_gcse
, print_rtl
, insns
);
2856 timevar_pop (TV_GCSE
);
2859 flag_cse_skip_blocks
= save_csb
;
2860 flag_cse_follow_jumps
= save_cfj
;
2863 /* Move constant computations out of loops. */
2867 timevar_push (TV_LOOP
);
2868 open_dump_file (DFI_loop
, decl
);
2869 free_bb_for_insn ();
2871 if (flag_rerun_loop_opt
)
2873 cleanup_barriers ();
2875 /* We only want to perform unrolling once. */
2877 loop_optimize (insns
, rtl_dump_file
, 0);
2879 /* The first call to loop_optimize makes some instructions
2880 trivially dead. We delete those instructions now in the
2881 hope that doing so will make the heuristics in loop work
2882 better and possibly speed up compilation. */
2883 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2885 /* The regscan pass is currently necessary as the alias
2886 analysis code depends on this information. */
2887 reg_scan (insns
, max_reg_num (), 1);
2889 cleanup_barriers ();
2890 loop_optimize (insns
, rtl_dump_file
,
2891 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
2892 | (flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0));
2894 close_dump_file (DFI_loop
, print_rtl
, insns
);
2895 timevar_pop (TV_LOOP
);
2902 timevar_push (TV_CSE2
);
2903 open_dump_file (DFI_cse2
, decl
);
2905 if (flag_rerun_cse_after_loop
)
2907 /* Running another jump optimization pass before the second
2908 cse pass sometimes simplifies the RTL enough to allow
2909 the second CSE pass to do a better job. Jump_optimize can change
2910 max_reg_num so we must rerun reg_scan afterwards.
2911 ??? Rework to not call reg_scan so often. */
2912 timevar_push (TV_JUMP
);
2914 /* The previous call to loop_optimize makes some instructions
2915 trivially dead. We delete those instructions now in the
2916 hope that doing so will make the heuristics in jump work
2917 better and possibly speed up compilation. */
2918 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2920 reg_scan (insns
, max_reg_num (), 0);
2922 timevar_push (TV_IFCVT
);
2924 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2925 cleanup_cfg (CLEANUP_EXPENSIVE
);
2928 timevar_pop(TV_IFCVT
);
2930 timevar_pop (TV_JUMP
);
2932 /* CFG is no longer maintained up-to-date. */
2933 free_bb_for_insn ();
2934 reg_scan (insns
, max_reg_num (), 0);
2935 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
2939 timevar_push (TV_JUMP
);
2940 rebuild_jump_labels (insns
);
2941 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2942 cleanup_cfg (CLEANUP_EXPENSIVE
);
2943 /* CFG is no longer maintained up-to-date. */
2944 free_bb_for_insn ();
2945 timevar_pop (TV_JUMP
);
2949 close_dump_file (DFI_cse2
, print_rtl
, insns
);
2950 timevar_pop (TV_CSE2
);
2955 cse_not_expected
= 1;
2959 /* Do control and data flow analysis; wrote some of the results to
2962 timevar_push (TV_FLOW
);
2963 open_dump_file (DFI_cfg
, decl
);
2965 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2966 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0)
2967 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2968 check_function_return_warnings ();
2970 /* It may make more sense to mark constant functions after dead code is
2971 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2972 may insert code making function non-constant, but we still must consider
2973 it as constant, otherwise -fbranch-probabilities will not read data back.
2975 life_analyzis rarely eliminates modification of external memory.
2977 mark_constant_function ();
2979 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2981 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2983 timevar_push (TV_BRANCH_PROB
);
2984 open_dump_file (DFI_bp
, decl
);
2988 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2989 timevar_pop (TV_BRANCH_PROB
);
2992 open_dump_file (DFI_life
, decl
);
2997 /* Discover and record the loop depth at the head of each basic
2998 block. The loop infrastructure does the real job for us. */
2999 flow_loops_find (&loops
, LOOP_TREE
);
3001 /* Estimate using heuristics if no profiling info is available. */
3002 if (flag_guess_branch_prob
)
3003 estimate_probability (&loops
);
3006 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3008 flow_loops_free (&loops
);
3010 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3011 timevar_pop (TV_FLOW
);
3015 if (warn_uninitialized
|| extra_warnings
)
3017 uninitialized_vars_warning (DECL_INITIAL (decl
));
3019 setjmp_args_warning ();
3024 if (initialize_uninitialized_subregs ())
3026 /* Insns were inserted, so things might look a bit different. */
3027 insns
= get_insns ();
3028 life_analysis (insns
, rtl_dump_file
,
3029 (PROP_LOG_LINKS
| PROP_REG_INFO
| PROP_DEATH_NOTES
));
3033 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3037 /* If -opt, try combining insns through substitution. */
3041 int rebuild_jump_labels_after_combine
= 0;
3043 timevar_push (TV_COMBINE
);
3044 open_dump_file (DFI_combine
, decl
);
3046 rebuild_jump_labels_after_combine
3047 = combine_instructions (insns
, max_reg_num ());
3049 /* Always purge dead edges, as we may eliminate an insn throwing
3051 rebuild_jump_labels_after_combine
|= purge_all_dead_edges (true);
3053 /* Combining insns may have turned an indirect jump into a
3054 direct jump. Rebuid the JUMP_LABEL fields of jumping
3056 if (rebuild_jump_labels_after_combine
)
3058 timevar_push (TV_JUMP
);
3059 rebuild_jump_labels (insns
);
3060 timevar_pop (TV_JUMP
);
3062 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3065 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3066 timevar_pop (TV_COMBINE
);
3071 /* Rerun if-conversion, as combine may have simplified things enough to
3072 now meet sequence length restrictions. */
3075 timevar_push (TV_IFCVT
);
3076 open_dump_file (DFI_ce
, decl
);
3082 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3083 timevar_pop (TV_IFCVT
);
3086 /* Register allocation pre-pass, to reduce number of moves
3087 necessary for two-address machines. */
3088 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3090 timevar_push (TV_REGMOVE
);
3091 open_dump_file (DFI_regmove
, decl
);
3093 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3095 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3096 timevar_pop (TV_REGMOVE
);
3101 /* Do unconditional splitting before register allocation to allow machine
3102 description to add extra information not needed previously. */
3103 split_all_insns (1);
3105 /* Any of the several passes since flow1 will have munged register
3106 lifetime data a bit. */
3107 register_life_up_to_date
= 0;
3109 #ifdef OPTIMIZE_MODE_SWITCHING
3110 timevar_push (TV_MODE_SWITCH
);
3113 if (optimize_mode_switching (NULL
))
3115 /* We did work, and so had to regenerate global life information.
3116 Take advantage of this and don't re-recompute register life
3117 information below. */
3118 register_life_up_to_date
= 1;
3122 timevar_pop (TV_MODE_SWITCH
);
3125 timevar_push (TV_SCHED
);
3127 #ifdef INSN_SCHEDULING
3129 /* Print function header into sched dump now
3130 because doing the sched analysis makes some of the dump. */
3131 if (optimize
> 0 && flag_schedule_insns
)
3133 open_dump_file (DFI_sched
, decl
);
3135 /* Do control and data sched analysis,
3136 and write some of the results to dump file. */
3138 schedule_insns (rtl_dump_file
);
3140 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3142 /* Register lifetime information was updated as part of verifying
3144 register_life_up_to_date
= 1;
3147 timevar_pop (TV_SCHED
);
3151 /* Determine if the current function is a leaf before running reload
3152 since this can impact optimizations done by the prologue and
3153 epilogue thus changing register elimination offsets. */
3154 current_function_is_leaf
= leaf_function_p ();
3156 timevar_push (TV_LOCAL_ALLOC
);
3157 open_dump_file (DFI_lreg
, decl
);
3159 /* Allocate pseudo-regs that are used only within 1 basic block.
3161 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3162 jump optimizer after register allocation and reloading are finished. */
3164 if (! register_life_up_to_date
)
3165 recompute_reg_usage (insns
, ! optimize_size
);
3167 /* Allocate the reg_renumber array. */
3168 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3170 /* And the reg_equiv_memory_loc array. */
3171 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3173 allocate_initial_values (reg_equiv_memory_loc
);
3175 regclass (insns
, max_reg_num (), rtl_dump_file
);
3176 rebuild_label_notes_after_reload
= local_alloc ();
3178 timevar_pop (TV_LOCAL_ALLOC
);
3180 if (dump_file
[DFI_lreg
].enabled
)
3182 timevar_push (TV_DUMP
);
3184 dump_flow_info (rtl_dump_file
);
3185 dump_local_alloc (rtl_dump_file
);
3187 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3188 timevar_pop (TV_DUMP
);
3193 timevar_push (TV_GLOBAL_ALLOC
);
3194 open_dump_file (DFI_greg
, decl
);
3196 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3197 pass fixing up any insns that are invalid. */
3200 failure
= global_alloc (rtl_dump_file
);
3203 build_insn_chain (insns
);
3204 failure
= reload (insns
, 0);
3207 timevar_pop (TV_GLOBAL_ALLOC
);
3209 if (dump_file
[DFI_greg
].enabled
)
3211 timevar_push (TV_DUMP
);
3213 dump_global_regs (rtl_dump_file
);
3215 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3216 timevar_pop (TV_DUMP
);
3220 goto exit_rest_of_compilation
;
3224 open_dump_file (DFI_postreload
, decl
);
3226 /* Do a very simple CSE pass over just the hard registers. */
3229 timevar_push (TV_RELOAD_CSE_REGS
);
3230 reload_cse_regs (insns
);
3231 timevar_pop (TV_RELOAD_CSE_REGS
);
3234 /* Register allocation and reloading may have turned an indirect jump into
3235 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3236 jumping instructions. */
3237 if (rebuild_label_notes_after_reload
)
3239 timevar_push (TV_JUMP
);
3241 rebuild_jump_labels (insns
);
3243 timevar_pop (TV_JUMP
);
3246 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3248 /* Re-create the death notes which were deleted during reload. */
3249 timevar_push (TV_FLOW2
);
3250 open_dump_file (DFI_flow2
, decl
);
3252 #ifdef ENABLE_CHECKING
3253 verify_flow_info ();
3256 /* If optimizing, then go ahead and split insns now. */
3258 split_all_insns (0);
3260 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3262 /* On some machines, the prologue and epilogue code, or parts thereof,
3263 can be represented as RTL. Doing so lets us schedule insns between
3264 it and the rest of the code and also allows delayed branch
3265 scheduling to operate in the epilogue. */
3266 thread_prologue_and_epilogue_insns (insns
);
3270 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_CROSSJUMP
);
3271 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3273 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3274 even for machines with possibly nonzero RETURN_POPS_ARGS
3275 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3276 push instructions will have popping returns. */
3277 #ifndef PUSH_ROUNDING
3278 if (!ACCUMULATE_OUTGOING_ARGS
)
3280 combine_stack_adjustments ();
3285 flow2_completed
= 1;
3287 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3288 timevar_pop (TV_FLOW2
);
3290 #ifdef HAVE_peephole2
3291 if (optimize
> 0 && flag_peephole2
)
3293 timevar_push (TV_PEEPHOLE2
);
3294 open_dump_file (DFI_peephole2
, decl
);
3296 peephole2_optimize (rtl_dump_file
);
3298 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3299 timevar_pop (TV_PEEPHOLE2
);
3303 if (flag_rename_registers
|| flag_cprop_registers
)
3305 timevar_push (TV_RENAME_REGISTERS
);
3306 open_dump_file (DFI_rnreg
, decl
);
3308 if (flag_rename_registers
)
3309 regrename_optimize ();
3310 if (flag_cprop_registers
)
3311 copyprop_hardreg_forward ();
3313 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3314 timevar_pop (TV_RENAME_REGISTERS
);
3319 timevar_push (TV_IFCVT2
);
3320 open_dump_file (DFI_ce2
, decl
);
3324 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3325 timevar_pop (TV_IFCVT2
);
3329 split_all_insns (1);
3332 #ifdef INSN_SCHEDULING
3333 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3335 timevar_push (TV_SCHED2
);
3336 open_dump_file (DFI_sched2
, decl
);
3338 /* Do control and data sched analysis again,
3339 and write some more of the results to dump file. */
3341 split_all_insns (1);
3343 schedule_insns (rtl_dump_file
);
3345 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3346 timevar_pop (TV_SCHED2
);
3352 #ifdef LEAF_REGISTERS
3353 current_function_uses_only_leaf_regs
3354 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3358 timevar_push (TV_REG_STACK
);
3359 open_dump_file (DFI_stack
, decl
);
3361 reg_to_stack (insns
, rtl_dump_file
);
3363 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3364 timevar_pop (TV_REG_STACK
);
3370 timevar_push (TV_REORDER_BLOCKS
);
3371 open_dump_file (DFI_bbro
, decl
);
3373 /* Last attempt to optimize CFG, as life analyzis possibly removed
3374 some instructions. */
3375 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3376 | CLEANUP_CROSSJUMP
);
3377 if (flag_reorder_blocks
)
3379 reorder_basic_blocks ();
3380 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3383 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3384 timevar_pop (TV_REORDER_BLOCKS
);
3386 compute_alignments ();
3388 /* CFG is no longer maintained up-to-date. */
3389 free_bb_for_insn ();
3391 /* If a machine dependent reorganization is needed, call it. */
3392 #ifdef MACHINE_DEPENDENT_REORG
3393 timevar_push (TV_MACH_DEP
);
3394 open_dump_file (DFI_mach
, decl
);
3396 MACHINE_DEPENDENT_REORG (insns
);
3398 close_dump_file (DFI_mach
, print_rtl
, insns
);
3399 timevar_pop (TV_MACH_DEP
);
3404 purge_line_number_notes (insns
);
3405 cleanup_barriers ();
3407 /* If a scheduling pass for delayed branches is to be done,
3408 call the scheduling code. */
3411 if (optimize
> 0 && flag_delayed_branch
)
3413 timevar_push (TV_DBR_SCHED
);
3414 open_dump_file (DFI_dbr
, decl
);
3416 dbr_schedule (insns
, rtl_dump_file
);
3418 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3419 timevar_pop (TV_DBR_SCHED
);
3425 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3426 timevar_push (TV_SHORTEN_BRANCH
);
3427 split_all_insns_noflow ();
3428 timevar_pop (TV_SHORTEN_BRANCH
);
3431 convert_to_eh_region_ranges ();
3433 /* Shorten branches. */
3434 timevar_push (TV_SHORTEN_BRANCH
);
3435 shorten_branches (get_insns ());
3436 timevar_pop (TV_SHORTEN_BRANCH
);
3438 current_function_nothrow
= nothrow_function_p ();
3439 if (current_function_nothrow
)
3440 /* Now we know that this can't throw; set the flag for the benefit
3441 of other functions later in this translation unit. */
3442 TREE_NOTHROW (current_function_decl
) = 1;
3444 /* Now turn the rtl into assembler code. */
3446 timevar_push (TV_FINAL
);
3451 /* Get the function's name, as described by its RTL. This may be
3452 different from the DECL_NAME name used in the source file. */
3454 x
= DECL_RTL (decl
);
3455 if (GET_CODE (x
) != MEM
)
3458 if (GET_CODE (x
) != SYMBOL_REF
)
3460 fnname
= XSTR (x
, 0);
3462 assemble_start_function (decl
, fnname
);
3463 final_start_function (insns
, asm_out_file
, optimize
);
3464 final (insns
, asm_out_file
, optimize
, 0);
3465 final_end_function ();
3467 #ifdef IA64_UNWIND_INFO
3468 /* ??? The IA-64 ".handlerdata" directive must be issued before
3469 the ".endp" directive that closes the procedure descriptor. */
3470 output_function_exception_table ();
3473 assemble_end_function (decl
, fnname
);
3475 #ifndef IA64_UNWIND_INFO
3476 /* Otherwise, it feels unclean to switch sections in the middle. */
3477 output_function_exception_table ();
3481 fflush (asm_out_file
);
3483 /* Release all memory allocated by flow. */
3484 free_basic_block_vars (0);
3486 /* Release all memory held by regsets now. */
3487 regset_release_memory ();
3489 timevar_pop (TV_FINAL
);
3493 /* Write DBX symbols if requested. */
3495 /* Note that for those inline functions where we don't initially
3496 know for certain that we will be generating an out-of-line copy,
3497 the first invocation of this routine (rest_of_compilation) will
3498 skip over this code by doing a `goto exit_rest_of_compilation;'.
3499 Later on, finish_compilation will call rest_of_compilation again
3500 for those inline functions that need to have out-of-line copies
3501 generated. During that call, we *will* be routed past here. */
3503 timevar_push (TV_SYMOUT
);
3504 (*debug_hooks
->function_decl
) (decl
);
3505 timevar_pop (TV_SYMOUT
);
3507 exit_rest_of_compilation
:
3509 /* In case the function was not output,
3510 don't leave any temporary anonymous types
3511 queued up for sdb output. */
3512 #ifdef SDB_DEBUGGING_INFO
3513 if (write_symbols
== SDB_DEBUG
)
3514 sdbout_types (NULL_TREE
);
3517 reload_completed
= 0;
3518 flow2_completed
= 0;
3521 timevar_push (TV_FINAL
);
3523 /* Clear out the insn_length contents now that they are no
3525 init_insn_lengths ();
3527 /* Clear out the real_constant_chain before some of the rtx's
3528 it runs through become garbage. */
3529 clear_const_double_mem ();
3531 /* Show no temporary slots allocated. */
3534 free_basic_block_vars (0);
3535 free_bb_for_insn ();
3537 timevar_pop (TV_FINAL
);
3539 /* Make sure volatile mem refs aren't considered valid operands for
3540 arithmetic insns. We must call this here if this is a nested inline
3541 function, since the above code leaves us in the init_recog state
3542 (from final.c), and the function context push/pop code does not
3543 save/restore volatile_ok.
3545 ??? Maybe it isn't necessary for expand_start_function to call this
3546 anymore if we do it here? */
3548 init_recog_no_volatile ();
3550 /* We're done with this function. Free up memory if we can. */
3551 free_after_parsing (cfun
);
3552 if (! DECL_DEFER_OUTPUT (decl
))
3554 free_after_compilation (cfun
);
3556 /* Clear integrate.c's pointer to the cfun structure we just
3558 DECL_SAVED_INSNS (decl
) = 0;
3564 timevar_pop (TV_REST_OF_COMPILATION
);
3574 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3575 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3576 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3577 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3578 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3579 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"));
3581 for (i
= ARRAY_SIZE (f_options
); i
--;)
3583 const char *description
= f_options
[i
].description
;
3585 if (description
!= NULL
&& * description
!= 0)
3586 printf (" -f%-21s %s\n",
3587 f_options
[i
].string
, _(description
));
3590 printf (_(" -O[number] Set optimization level to [number]\n"));
3591 printf (_(" -Os Optimize for space rather than speed\n"));
3592 for (i
= LAST_PARAM
; i
--;)
3594 const char *description
= compiler_params
[i
].help
;
3595 const int length
= 21-strlen(compiler_params
[i
].option
);
3597 if (description
!= NULL
&& * description
!= 0)
3598 printf (" --param %s=<value>%.*s%s\n",
3599 compiler_params
[i
].option
,
3600 length
> 0 ? length
: 1, " ",
3603 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3604 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3605 printf (_(" -w Suppress warnings\n"));
3606 printf (_(" -W Enable extra warnings\n"));
3608 for (i
= ARRAY_SIZE (W_options
); i
--;)
3610 const char *description
= W_options
[i
].description
;
3612 if (description
!= NULL
&& * description
!= 0)
3613 printf (" -W%-21s %s\n",
3614 W_options
[i
].string
, _(description
));
3617 printf (_(" -Wunused Enable unused warnings\n"));
3618 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3619 printf (_(" -p Enable function profiling\n"));
3620 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3621 printf (_(" -a Enable block profiling \n"));
3623 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3624 printf (_(" -ax Enable jump profiling \n"));
3626 printf (_(" -o <file> Place output into <file> \n"));
3628 -G <number> Put global and static data smaller than <number>\n\
3629 bytes into a special section (on some targets)\n"));
3631 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3633 if (debug_args
[i
].description
!= NULL
)
3634 printf (" -g%-21s %s\n",
3635 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3638 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3639 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3640 printf (_(" -version Display the compiler's version\n"));
3641 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3642 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3643 #if defined INSN_SCHEDULING
3644 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3646 printf (_(" --help Display this information\n"));
3651 /* Display descriptions of language specific options.
3652 If there is no description, note that there is an undocumented option.
3653 If the description is empty, do not display anything. (This allows
3654 options to be deliberately undocumented, for whatever reason).
3655 If the option string is missing, then this is a marker, indicating
3656 that the description string is in fact the name of a language, whose
3657 language specific options are to follow. */
3659 if (ARRAY_SIZE (documented_lang_options
) > 1)
3661 printf (_("\nLanguage specific options:\n"));
3663 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3665 const char *description
= documented_lang_options
[i
].description
;
3666 const char *option
= documented_lang_options
[i
].option
;
3668 if (description
== NULL
)
3673 printf (_(" %-23.23s [undocumented]\n"), option
);
3675 else if (*description
== 0)
3677 else if (option
== NULL
)
3681 (_("\nThere are undocumented %s specific options as well.\n"),
3685 printf (_("\n Options for %s:\n"), description
);
3690 printf (" %-23.23s %s\n", option
, _(description
));
3695 printf (_("\nThere are undocumented %s specific options as well.\n"),
3698 display_target_options ();
3702 display_target_options ()
3705 static bool displayed
= false;
3707 /* Avoid double printing for --help --target-help. */
3712 if (ARRAY_SIZE (target_switches
) > 1
3713 #ifdef TARGET_OPTIONS
3714 || ARRAY_SIZE (target_options
) > 1
3722 printf (_("\nTarget specific options:\n"));
3724 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3726 const char *option
= target_switches
[i
].name
;
3727 const char *description
= target_switches
[i
].description
;
3729 if (option
== NULL
|| *option
== 0)
3731 else if (description
== NULL
)
3736 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3738 else if (* description
!= 0)
3739 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3742 #ifdef TARGET_OPTIONS
3743 for (i
= ARRAY_SIZE (target_options
); i
--;)
3745 const char *option
= target_options
[i
].prefix
;
3746 const char *description
= target_options
[i
].description
;
3748 if (option
== NULL
|| *option
== 0)
3750 else if (description
== NULL
)
3755 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3757 else if (* description
!= 0)
3758 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3764 printf (_("\nThere are undocumented target specific options as well.\n"));
3766 printf (_(" They exist, but they are not documented.\n"));
3771 /* Parse a -d... command line switch. */
3774 decode_d_option (arg
)
3783 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3784 dump_file
[i
].enabled
= 1;
3790 flag_print_asm_name
= 1;
3793 flag_dump_rtl_in_asm
= 1;
3794 flag_print_asm_name
= 1;
3797 graph_dump_format
= vcg
;
3800 rtl_dump_and_exit
= 1;
3803 (*lang_hooks
.set_yydebug
) (1);
3805 case 'D': /* These are handled by the preprocessor. */
3811 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3812 if (c
== dump_file
[i
].debug_switch
)
3814 dump_file
[i
].enabled
= 1;
3819 warning ("unrecognized gcc debugging option: %c", c
);
3824 /* Parse a -f... command line switch. ARG is the value after the -f.
3825 It is safe to access 'ARG - 2' to generate the full switch name.
3826 Return the number of strings consumed. */
3829 decode_f_option (arg
)
3833 const char *option_value
= NULL
;
3835 /* Search for the option in the table of binary f options. */
3836 for (j
= ARRAY_SIZE (f_options
); j
--;)
3838 if (!strcmp (arg
, f_options
[j
].string
))
3840 *f_options
[j
].variable
= f_options
[j
].on_value
;
3844 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3845 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3847 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3852 if (!strcmp (arg
, "fast-math"))
3853 set_fast_math_flags ();
3854 else if (!strcmp (arg
, "no-fast-math"))
3855 set_no_fast_math_flags ();
3856 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3857 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3860 read_integral_parameter (option_value
, arg
- 2,
3862 set_param_value ("max-inline-insns", val
);
3864 #ifdef INSN_SCHEDULING
3865 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3866 fix_sched_param ("verbose", option_value
);
3868 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3869 fix_register (option_value
, 1, 1);
3870 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3871 fix_register (option_value
, 0, 1);
3872 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3873 fix_register (option_value
, 0, 0);
3874 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3875 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3876 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3878 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3879 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3880 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3881 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3883 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3884 else if ((option_value
3885 = skip_leading_substring (arg
, "stack-limit-register=")))
3887 int reg
= decode_reg_name (option_value
);
3889 error ("unrecognized register name `%s'", option_value
);
3891 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3893 else if ((option_value
3894 = skip_leading_substring (arg
, "stack-limit-symbol=")))
3897 nm
= ggc_strdup (option_value
);
3898 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
3900 else if ((option_value
3901 = skip_leading_substring (arg
, "message-length=")))
3902 output_set_maximum_length
3903 (&global_dc
->buffer
, read_integral_parameter
3904 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
3905 else if ((option_value
3906 = skip_leading_substring (arg
, "diagnostics-show-location=")))
3908 if (!strcmp (option_value
, "once"))
3909 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
3910 else if (!strcmp (option_value
, "every-line"))
3911 diagnostic_prefixing_rule (global_dc
)
3912 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
3914 error ("unrecognized option `%s'", arg
- 2);
3916 else if (!strcmp (arg
, "no-stack-limit"))
3917 stack_limit_rtx
= NULL_RTX
;
3918 else if (!strcmp (arg
, "preprocessed"))
3919 /* Recognise this switch but do nothing. This prevents warnings
3920 about an unrecognized switch if cpplib has not been linked in. */
3928 /* Parse a -W... command line switch. ARG is the value after the -W.
3929 It is safe to access 'ARG - 2' to generate the full switch name.
3930 Return the number of strings consumed. */
3933 decode_W_option (arg
)
3936 const char *option_value
= NULL
;
3939 /* Search for the option in the table of binary W options. */
3941 for (j
= ARRAY_SIZE (W_options
); j
--;)
3943 if (!strcmp (arg
, W_options
[j
].string
))
3945 *W_options
[j
].variable
= W_options
[j
].on_value
;
3949 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3950 && ! strcmp (arg
+ 3, W_options
[j
].string
))
3952 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
3957 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
3958 warning ("-Wid-clash-LEN is no longer supported");
3959 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
3961 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
3963 warn_larger_than
= larger_than_size
!= -1;
3965 else if (!strcmp (arg
, "unused"))
3969 else if (!strcmp (arg
, "no-unused"))
3979 /* Parse a -g... command line switch. ARG is the value after the -g.
3980 It is safe to access 'ARG - 2' to generate the full switch name.
3981 Return the number of strings consumed. */
3984 decode_g_option (arg
)
3987 static unsigned level
=0;
3988 /* A lot of code assumes write_symbols == NO_DEBUG if the
3989 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3990 of what debugging type has been selected). This records the
3991 selected type. It is an error to specify more than one
3993 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
3994 /* Non-zero if debugging format has been explicitly set.
3995 -g and -ggdb don't explicitly set the debugging format so
3996 -gdwarf -g3 is equivalent to -gdwarf3. */
3997 static int type_explicitly_set_p
= 0;
3998 /* Indexed by enum debug_info_type. */
3999 static const char *const debug_type_names
[] =
4001 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4004 /* The maximum admissible debug level value. */
4005 static const unsigned max_debug_level
= 3;
4007 /* Look up ARG in the table. */
4008 for (da
= debug_args
; da
->arg
; da
++)
4010 const int da_len
= strlen (da
->arg
);
4012 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4014 enum debug_info_type type
= da
->debug_type
;
4015 const char *p
= arg
+ da_len
;
4017 if (*p
&& ! ISDIGIT (*p
))
4020 /* A debug flag without a level defaults to level 2.
4021 Note we do not want to call read_integral_parameter
4022 for that case since it will call atoi which
4025 ??? We may want to generalize the interface to
4026 read_integral_parameter to better handle this case
4027 if this case shows up often. */
4029 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4031 level
= (level
== 0) ? 2 : level
;
4033 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4035 error ("use -gdwarf -g%d for DWARF v1, level %d",
4038 error ("use -gdwarf-2 for DWARF v2");
4041 if (level
> max_debug_level
)
4044 ignoring option `%s' due to invalid debug level specification",
4046 level
= debug_info_level
;
4049 if (type
== NO_DEBUG
)
4051 type
= PREFERRED_DEBUGGING_TYPE
;
4053 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4055 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4056 type
= DWARF2_DEBUG
;
4058 #ifdef DBX_DEBUGGING_INFO
4065 if (type
== NO_DEBUG
)
4066 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4068 /* Does it conflict with an already selected type? */
4069 if (type_explicitly_set_p
4070 /* -g/-ggdb don't conflict with anything. */
4071 && da
->debug_type
!= NO_DEBUG
4072 && type
!= selected_debug_type
)
4073 warning ("`%s' ignored, conflicts with `-g%s'",
4074 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4077 /* If the format has already been set, -g/-ggdb
4078 only change the debug level. */
4079 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4080 /* Don't change debugging type. */
4084 selected_debug_type
= type
;
4085 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4088 write_symbols
= (level
== 0
4090 : selected_debug_type
);
4091 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4092 debug_info_level
= (enum debug_info_level
) level
;
4105 /* Decode the first argument in the argv as a language-independent option.
4106 Return the number of strings consumed. */
4109 independent_decode_option (argc
, argv
)
4113 char *arg
= argv
[0];
4115 if (arg
[0] != '-' || arg
[1] == 0)
4127 if (!strcmp (arg
, "-help"))
4130 exit_after_options
= 1;
4133 if (!strcmp (arg
, "-target-help"))
4135 display_target_options ();
4136 exit_after_options
= 1;
4139 if (!strcmp (arg
, "-version"))
4141 print_version (stderr
, "");
4142 exit_after_options
= 1;
4145 /* Handle '--param <name>=<value>'. */
4146 if (strcmp (arg
, "-param") == 0)
4152 error ("-param option missing argument");
4156 /* Get the '<name>=<value>' parameter. */
4158 /* Look for the `='. */
4159 equal
= strchr (arg
, '=');
4161 error ("invalid --param option: %s", arg
);
4166 /* Zero out the `=' sign so that we get two separate strings. */
4168 /* Figure out what value is specified. */
4169 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4170 if (val
!= INVALID_PARAM_VAL
)
4171 set_param_value (arg
, val
);
4173 error ("invalid parameter value `%s'", equal
+ 1);
4188 /* Already been treated in main (). Do nothing. */
4192 set_target_switch (arg
+ 1);
4196 return decode_f_option (arg
+ 1);
4199 return decode_g_option (arg
+ 1);
4202 if (!strcmp (arg
, "dumpbase"))
4207 dump_base_name
= argv
[1];
4211 decode_d_option (arg
+ 1);
4215 if (!strcmp (arg
, "pedantic"))
4217 else if (!strcmp (arg
, "pedantic-errors"))
4218 flag_pedantic_errors
= pedantic
= 1;
4219 else if (arg
[1] == 0)
4226 if (!strcmp (arg
, "quiet"))
4233 if (!strcmp (arg
, "version"))
4241 inhibit_warnings
= 1;
4250 /* We save the value of warn_uninitialized, since if they put
4251 -Wuninitialized on the command line, we need to generate a
4252 warning about not using it without also specifying -O. */
4253 if (warn_uninitialized
!= 1)
4254 warn_uninitialized
= 2;
4257 return decode_W_option (arg
+ 1);
4261 if (!strncmp (arg
, "aux-info", 8))
4268 aux_info_file_name
= argv
[1];
4269 flag_gen_aux_info
= 1;
4272 else if (arg
[8] == '=')
4274 aux_info_file_name
= arg
+ 9;
4275 flag_gen_aux_info
= 1;
4290 asm_file_name
= argv
[1];
4305 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4310 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4314 if (g_switch_val
== -1)
4318 g_switch_set
= TRUE
;
4319 g_switch_value
= g_switch_val
;
4329 /* Decode -m switches. */
4330 /* Decode the switch -mNAME. */
4333 set_target_switch (name
)
4337 int valid_target_option
= 0;
4339 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4340 if (!strcmp (target_switches
[j
].name
, name
))
4342 if (target_switches
[j
].value
< 0)
4343 target_flags
&= ~-target_switches
[j
].value
;
4345 target_flags
|= target_switches
[j
].value
;
4346 valid_target_option
= 1;
4349 #ifdef TARGET_OPTIONS
4350 if (!valid_target_option
)
4351 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4353 int len
= strlen (target_options
[j
].prefix
);
4354 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4356 *target_options
[j
].variable
= name
+ len
;
4357 valid_target_option
= 1;
4362 if (!valid_target_option
)
4363 error ("invalid option `%s'", name
);
4366 /* Print version information to FILE.
4367 Each line begins with INDENT (for the case where FILE is the
4368 assembler output file). */
4371 print_version (file
, indent
)
4376 #define __VERSION__ "[?]"
4380 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4382 "%s%s%s version %s (%s) compiled by CC.\n"
4384 , indent
, *indent
!= 0 ? " " : "",
4385 lang_hooks
.name
, version_string
, TARGET_NAME
,
4386 indent
, __VERSION__
);
4389 /* Print an option value and return the adjusted position in the line.
4390 ??? We don't handle error returns from fprintf (disk full); presumably
4391 other code will catch a disk full though. */
4394 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4397 const char *indent
, *sep
, *term
, *type
, *name
;
4399 /* The ultrix fprintf returns 0 on success, so compute the result we want
4400 here since we need it for the following test. */
4401 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4406 fprintf (file
, "%s", term
);
4411 fprintf (file
, "%s", indent
);
4412 pos
= strlen (indent
);
4414 fprintf (file
, "%s%s%s", sep
, type
, name
);
4419 /* Print active target switches to FILE.
4420 POS is the current cursor position and MAX is the size of a "line".
4421 Each line begins with INDENT and ends with TERM.
4422 Each switch is separated from the next by SEP. */
4425 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4428 const char *indent
, *sep
, *term
;
4433 /* Print the options as passed. */
4435 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4436 _("options passed: "), "");
4438 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4442 if (strcmp (*p
, "-o") == 0)
4448 if (strcmp (*p
, "-quiet") == 0)
4450 if (strcmp (*p
, "-version") == 0)
4455 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4458 fprintf (file
, "%s", term
);
4460 /* Print the -f and -m options that have been enabled.
4461 We don't handle language specific options but printing argv
4464 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4465 _("options enabled: "), "");
4467 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4468 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4469 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4470 "-f", f_options
[j
].string
);
4472 /* Print target specific options. */
4474 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4475 if (target_switches
[j
].name
[0] != '\0'
4476 && target_switches
[j
].value
> 0
4477 && ((target_switches
[j
].value
& target_flags
)
4478 == target_switches
[j
].value
))
4480 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4481 "-m", target_switches
[j
].name
);
4484 #ifdef TARGET_OPTIONS
4485 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4486 if (*target_options
[j
].variable
!= NULL
)
4489 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4490 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4491 prefix
, *target_options
[j
].variable
);
4495 fprintf (file
, "%s", term
);
4498 /* Open assembly code output file. Do this even if -fsyntax-only is
4499 on, because then the driver will have provided the name of a
4500 temporary file or bit bucket for us. NAME is the file specified on
4501 the command line, possibly NULL. */
4503 init_asm_output (name
)
4506 if (name
== NULL
&& asm_file_name
== 0)
4507 asm_out_file
= stdout
;
4510 if (asm_file_name
== 0)
4512 int len
= strlen (dump_base_name
);
4513 char *dumpname
= (char *) xmalloc (len
+ 6);
4514 memcpy (dumpname
, dump_base_name
, len
+ 1);
4515 strip_off_ending (dumpname
, len
);
4516 strcat (dumpname
, ".s");
4517 asm_file_name
= dumpname
;
4519 if (!strcmp (asm_file_name
, "-"))
4520 asm_out_file
= stdout
;
4522 asm_out_file
= fopen (asm_file_name
, "w");
4523 if (asm_out_file
== 0)
4524 fatal_io_error ("can't open %s for writing", asm_file_name
);
4527 #ifdef IO_BUFFER_SIZE
4528 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4529 _IOFBF
, IO_BUFFER_SIZE
);
4532 if (!flag_syntax_only
)
4534 #ifdef ASM_FILE_START
4535 ASM_FILE_START (asm_out_file
);
4538 #ifdef ASM_COMMENT_START
4539 if (flag_verbose_asm
)
4541 /* Print the list of options in effect. */
4542 print_version (asm_out_file
, ASM_COMMENT_START
);
4543 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4544 ASM_COMMENT_START
, " ", "\n");
4545 /* Add a blank line here so it appears in assembler output but not
4547 fprintf (asm_out_file
, "\n");
4553 /* Initialization of the front end environment, before command line
4554 options are parsed. Signal handlers, internationalization etc.
4555 ARGV0 is main's argv[0]. */
4557 general_init (argv0
)
4562 p
= argv0
+ strlen (argv0
);
4563 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4567 xmalloc_set_program_name (progname
);
4569 gcc_init_libintl ();
4571 /* Install handler for SIGFPE, which may be received while we do
4572 compile-time floating point arithmetic. */
4573 signal (SIGFPE
, float_signal
);
4575 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4577 signal (SIGSEGV
, crash_signal
);
4580 signal (SIGILL
, crash_signal
);
4583 signal (SIGBUS
, crash_signal
);
4586 signal (SIGABRT
, crash_signal
);
4588 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4589 signal (SIGIOT
, crash_signal
);
4592 /* Initialize the diagnostics reporting machinery, so option parsing
4593 can give warnings and errors. */
4594 diagnostic_initialize (global_dc
);
4597 /* Parse command line options and set default flag values, called
4598 after language-independent option-independent initialization. Do
4599 minimal options processing. Outputting diagnostics is OK, but GC
4600 and identifier hashtables etc. are not initialized yet. */
4602 parse_options_and_default_flags (argc
, argv
)
4608 /* Save in case md file wants to emit args as a comment. */
4612 /* Initialize register usage now so switches may override. */
4615 /* Register the language-independent parameters. */
4616 add_params (lang_independent_params
, LAST_PARAM
);
4618 /* Perform language-specific options initialization. */
4619 (*lang_hooks
.init_options
) ();
4621 /* Scan to see what optimization level has been specified. That will
4622 determine the default value of many flags. */
4623 for (i
= 1; i
< argc
; i
++)
4625 if (!strcmp (argv
[i
], "-O"))
4630 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4632 /* Handle -Os, -O2, -O3, -O69, ... */
4633 char *p
= &argv
[i
][2];
4635 if ((p
[0] == 's') && (p
[1] == 0))
4639 /* Optimizing for size forces optimize to be 2. */
4644 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4645 if (optimize_val
!= -1)
4647 optimize
= optimize_val
;
4656 flag_merge_constants
= 0;
4662 flag_thread_jumps
= 1;
4664 flag_delayed_branch
= 1;
4666 #ifdef CAN_DEBUG_WITHOUT_FP
4667 flag_omit_frame_pointer
= 1;
4669 flag_guess_branch_prob
= 1;
4670 flag_cprop_registers
= 1;
4675 flag_optimize_sibling_calls
= 1;
4676 flag_cse_follow_jumps
= 1;
4677 flag_cse_skip_blocks
= 1;
4679 flag_expensive_optimizations
= 1;
4680 flag_strength_reduce
= 1;
4681 flag_rerun_cse_after_loop
= 1;
4682 flag_rerun_loop_opt
= 1;
4683 flag_caller_saves
= 1;
4686 #ifdef INSN_SCHEDULING
4687 flag_schedule_insns
= 1;
4688 flag_schedule_insns_after_reload
= 1;
4691 flag_strict_aliasing
= 1;
4692 flag_delete_null_pointer_checks
= 1;
4693 flag_reorder_blocks
= 1;
4698 flag_inline_functions
= 1;
4699 flag_rename_registers
= 1;
4702 if (optimize
< 2 || optimize_size
)
4707 align_functions
= 1;
4710 /* Initialize whether `char' is signed. */
4711 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4712 #ifdef DEFAULT_SHORT_ENUMS
4713 /* Initialize how much space enums occupy, by default. */
4714 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4717 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4720 set_target_switch ("");
4722 /* Unwind tables are always present in an ABI-conformant IA-64
4723 object file, so the default should be ON. */
4724 #ifdef IA64_UNWIND_INFO
4725 flag_unwind_tables
= IA64_UNWIND_INFO
;
4728 #ifdef OPTIMIZATION_OPTIONS
4729 /* Allow default optimizations to be specified on a per-machine basis. */
4730 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4733 /* Perform normal command line switch decoding. */
4734 for (i
= 1; i
< argc
;)
4737 int indep_processed
;
4739 /* Give the language a chance to decode the option for itself. */
4740 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4742 if (lang_processed
>= 0)
4743 /* Now see if the option also has a language independent meaning.
4744 Some options are both language specific and language independent,
4746 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4749 lang_processed
= -lang_processed
;
4750 indep_processed
= 0;
4753 if (lang_processed
|| indep_processed
)
4754 i
+= MAX (lang_processed
, indep_processed
);
4757 const char *option
= NULL
;
4758 const char *lang
= NULL
;
4761 /* It is possible that the command line switch is not valid for the
4762 current language, but it is valid for another language. In order
4763 to be compatible with previous versions of the compiler (which
4764 did not issue an error message in this case) we check for this
4765 possibility here. If we do find a match, then if extra_warnings
4766 is set we generate a warning message, otherwise we will just
4767 ignore the option. */
4768 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4770 option
= documented_lang_options
[j
].option
;
4773 lang
= documented_lang_options
[j
].description
;
4774 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4778 if (j
!= ARRAY_SIZE (documented_lang_options
))
4782 warning ("ignoring command line option '%s'", argv
[i
]);
4785 ("(it is valid for %s but not the selected language)",
4789 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4790 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4792 error ("unrecognized option `%s'", argv
[i
]);
4798 /* Set flag_no_inline before the post_options () hook. The C front
4799 ends use it to determine tree inlining defaults. FIXME: such
4800 code should be lang-independent when all front ends use tree
4801 inlining, in which case it, and this condition, should be moved
4802 to the top of process_options() instead. */
4805 /* Inlining does not work if not optimizing,
4806 so force it not to be done. */
4810 /* The c_decode_option function and decode_option hook set
4811 this to `2' if -Wall is used, so we can avoid giving out
4812 lots of errors for people who don't realize what -Wall does. */
4813 if (warn_uninitialized
== 1)
4814 warning ("-Wuninitialized is not supported without -O");
4817 /* All command line options have been parsed; allow the front end to
4818 perform consistency checks, etc. */
4819 (*lang_hooks
.post_options
) ();
4822 /* Process the options that have been parsed. */
4826 #ifdef OVERRIDE_OPTIONS
4827 /* Some machines may reject certain combinations of options. */
4831 /* Set up the align_*_log variables, defaulting them to 1 if they
4832 were still unset. */
4833 if (align_loops
<= 0) align_loops
= 1;
4834 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4835 align_loops_max_skip
= align_loops
- 1;
4836 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4837 if (align_jumps
<= 0) align_jumps
= 1;
4838 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4839 align_jumps_max_skip
= align_jumps
- 1;
4840 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4841 if (align_labels
<= 0) align_labels
= 1;
4842 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4843 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4844 align_labels_max_skip
= align_labels
- 1;
4845 if (align_functions
<= 0) align_functions
= 1;
4846 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4848 /* Unrolling all loops implies that standard loop unrolling must also
4850 if (flag_unroll_all_loops
)
4851 flag_unroll_loops
= 1;
4852 /* Loop unrolling requires that strength_reduction be on also. Silently
4853 turn on strength reduction here if it isn't already on. Also, the loop
4854 unrolling code assumes that cse will be run after loop, so that must
4855 be turned on also. */
4856 if (flag_unroll_loops
)
4858 flag_strength_reduce
= 1;
4859 flag_rerun_cse_after_loop
= 1;
4862 if (flag_non_call_exceptions
)
4863 flag_asynchronous_unwind_tables
= 1;
4864 if (flag_asynchronous_unwind_tables
)
4865 flag_unwind_tables
= 1;
4867 /* Warn about options that are not supported on this machine. */
4868 #ifndef INSN_SCHEDULING
4869 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4870 warning ("instruction scheduling not supported on this target machine");
4873 if (flag_delayed_branch
)
4874 warning ("this target machine does not have delayed branches");
4877 /* Some operating systems do not allow profiling without a frame
4879 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4881 && flag_omit_frame_pointer
)
4883 error ("profiling does not work without a frame pointer");
4884 flag_omit_frame_pointer
= 0;
4887 user_label_prefix
= USER_LABEL_PREFIX
;
4888 if (flag_leading_underscore
!= -1)
4890 /* If the default prefix is more complicated than "" or "_",
4891 issue a warning and ignore this option. */
4892 if (user_label_prefix
[0] == 0 ||
4893 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4895 user_label_prefix
= flag_leading_underscore
? "_" : "";
4898 warning ("-f%sleading-underscore not supported on this target machine",
4899 flag_leading_underscore
? "" : "no-");
4902 /* If we are in verbose mode, write out the version and maybe all the
4903 option flags in use. */
4906 print_version (stderr
, "");
4908 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4914 if (flag_syntax_only
)
4916 write_symbols
= NO_DEBUG
;
4920 /* Now we know write_symbols, set up the debug hooks based on it.
4921 By default we do nothing for debug output. */
4922 #if defined(DBX_DEBUGGING_INFO)
4923 if (write_symbols
== DBX_DEBUG
)
4924 debug_hooks
= &dbx_debug_hooks
;
4926 #if defined(XCOFF_DEBUGGING_INFO)
4927 if (write_symbols
== XCOFF_DEBUG
)
4928 debug_hooks
= &xcoff_debug_hooks
;
4930 #ifdef SDB_DEBUGGING_INFO
4931 if (write_symbols
== SDB_DEBUG
)
4932 debug_hooks
= &sdb_debug_hooks
;
4934 #ifdef DWARF_DEBUGGING_INFO
4935 if (write_symbols
== DWARF_DEBUG
)
4936 debug_hooks
= &dwarf_debug_hooks
;
4938 #ifdef DWARF2_DEBUGGING_INFO
4939 if (write_symbols
== DWARF2_DEBUG
)
4940 debug_hooks
= &dwarf2_debug_hooks
;
4942 #ifdef VMS_DEBUGGING_INFO
4943 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4944 debug_hooks
= &vmsdbg_debug_hooks
;
4947 /* If auxiliary info generation is desired, open the output file.
4948 This goes in the same directory as the source file--unlike
4949 all the other output files. */
4950 if (flag_gen_aux_info
)
4952 aux_info_file
= fopen (aux_info_file_name
, "w");
4953 if (aux_info_file
== 0)
4954 fatal_io_error ("can't open %s", aux_info_file_name
);
4957 if (! targetm
.have_named_sections
)
4959 if (flag_function_sections
)
4961 warning ("-ffunction-sections not supported for this target");
4962 flag_function_sections
= 0;
4964 if (flag_data_sections
)
4966 warning ("-fdata-sections not supported for this target");
4967 flag_data_sections
= 0;
4971 if (flag_function_sections
&& profile_flag
)
4973 warning ("-ffunction-sections disabled; it makes profiling impossible");
4974 flag_function_sections
= 0;
4977 #ifndef HAVE_prefetch
4978 if (flag_prefetch_loop_arrays
)
4980 warning ("-fprefetch-loop-arrays not supported for this target");
4981 flag_prefetch_loop_arrays
= 0;
4984 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
4986 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4987 flag_prefetch_loop_arrays
= 0;
4991 /* This combination of options isn't handled for i386 targets and doesn't
4992 make much sense anyway, so don't allow it. */
4993 if (flag_prefetch_loop_arrays
&& optimize_size
)
4995 warning ("-fprefetch-loop-arrays is not supported with -Os");
4996 flag_prefetch_loop_arrays
= 0;
4999 #ifndef OBJECT_FORMAT_ELF
5000 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5001 warning ("-ffunction-sections may affect debugging on some targets");
5005 /* Language-independent initialization, before language-dependent
5008 lang_independent_init ()
5010 decl_printable_name
= decl_name
;
5011 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
5013 /* Set the language-dependent identifier size. */
5014 tree_code_length
[(int) IDENTIFIER_NODE
]
5015 = ((lang_hooks
.identifier_size
- sizeof (struct tree_common
)
5016 + sizeof (tree
) - 1) / sizeof (tree
));
5018 /* Initialize the garbage-collector, and string pools. */
5020 ggc_add_rtx_root (&stack_limit_rtx
, 1);
5021 ggc_add_tree_root (¤t_function_decl
, 1);
5022 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
5027 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5028 || debug_info_level
== DINFO_LEVEL_VERBOSE
5029 #ifdef VMS_DEBUGGING_INFO
5030 /* Enable line number info for traceback */
5031 || debug_info_level
> DINFO_LEVEL_NONE
5033 || flag_test_coverage
5034 || warn_notreached
);
5040 init_function_once ();
5041 init_stor_layout_once ();
5042 init_varasm_once ();
5043 init_EXPR_INSN_LIST_cache ();
5045 /* The following initialization functions need to generate rtl, so
5046 provide a dummy function context for them. */
5047 init_dummy_function_start ();
5050 if (flag_caller_saves
)
5051 init_caller_save ();
5052 expand_dummy_function_end ();
5055 /* Language-dependent initialization. Returns non-zero on success. */
5057 lang_dependent_init (name
)
5060 if (dump_base_name
== 0)
5061 dump_base_name
= name
? name
: "gccdump";
5063 /* Front-end initialization. This hook can assume that GC,
5064 identifier hashes etc. are set up, but debug initialization is
5065 not done yet. This routine must return the original filename
5066 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5067 name
= (*lang_hooks
.init
) (name
);
5071 /* Is this duplication necessary? */
5072 name
= ggc_strdup (name
);
5073 main_input_filename
= input_filename
= name
;
5074 init_asm_output (name
);
5076 /* These create various _DECL nodes, so need to be called after the
5077 front end is initialized. */
5081 /* Put an entry on the input file stack for the main input file. */
5082 push_srcloc (input_filename
, 0);
5084 /* If dbx symbol table desired, initialize writing it and output the
5085 predefined types. */
5086 timevar_push (TV_SYMOUT
);
5088 #ifdef DWARF2_UNWIND_INFO
5089 if (dwarf2out_do_frame ())
5090 dwarf2out_frame_init ();
5093 /* Now we have the correct original filename, we can initialize
5095 (*debug_hooks
->init
) (name
);
5097 timevar_pop (TV_SYMOUT
);
5102 /* Clean up: close opened files, etc. */
5107 /* Close the dump files. */
5108 if (flag_gen_aux_info
)
5110 fclose (aux_info_file
);
5112 unlink (aux_info_file_name
);
5115 /* Close non-debugging input and output files. Take special care to note
5116 whether fclose returns an error, since the pages might still be on the
5117 buffer chain while the file is open. */
5121 if (ferror (asm_out_file
) != 0)
5122 fatal_io_error ("error writing to %s", asm_file_name
);
5123 if (fclose (asm_out_file
) != 0)
5124 fatal_io_error ("error closing %s", asm_file_name
);
5127 /* Do whatever is necessary to finish printing the graphs. */
5128 if (graph_dump_format
!= no_graph
)
5132 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5133 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5138 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5139 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5140 finish_graph_dump_file (dump_base_name
, suffix
);
5147 ggc_print_statistics ();
5148 stringpool_statistics ();
5149 dump_tree_statistics ();
5152 /* Free up memory for the benefit of leak detectors. */
5155 /* Language-specific end of compilation actions. */
5156 (*lang_hooks
.finish
) ();
5159 /* Initialize the compiler, and compile the input file. */
5163 /* The bulk of command line switch processing. */
5166 /* We cannot start timing until after options are processed since that
5167 says if we run timers or not. */
5169 timevar_start (TV_TOTAL
);
5171 /* Language-independent initialization. Also sets up GC, identifier
5173 lang_independent_init ();
5175 /* Language-dependent initialization. Returns true on success. */
5176 if (lang_dependent_init (filename
))
5181 /* Stop timing and print the times. */
5182 timevar_stop (TV_TOTAL
);
5183 timevar_print (stderr
);
5186 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5187 Decode command args, then call compile_file.
5188 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5189 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5191 It is not safe to call this function more than once. */
5194 toplev_main (argc
, argv
)
5200 /* Initialization of GCC's environment, and diagnostics. */
5201 general_init (argv
[0]);
5203 /* Parse the options and do minimal processing; basically just
5204 enough to default flags appropriately. */
5205 parse_options_and_default_flags (argc
, argv
);
5207 /* Exit early if we can (e.g. -help). */
5208 if (!exit_after_options
)
5211 if (errorcount
|| sorrycount
)
5212 return (FATAL_EXIT_CODE
);
5214 return (SUCCESS_EXIT_CODE
);