1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
46 #include "insn-attr.h"
47 #include "insn-config.h"
48 #include "insn-flags.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
71 #include "langhooks.h"
72 #include "cfglayout.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. */
91 /* Carry information from ASM_DECLARE_OBJECT_NAME
92 to ASM_FINISH_DECLARE_OBJECT. */
94 extern int size_directive_output
;
95 extern tree last_assemble_variable_decl
;
97 extern void reg_alloc
PARAMS ((void));
99 static void general_init
PARAMS ((char *));
100 static bool parse_options_and_default_flags
PARAMS ((int, char **));
101 static void do_compile
PARAMS ((int));
102 static void process_options
PARAMS ((void));
103 static void lang_independent_init
PARAMS ((int));
104 static int lang_dependent_init
PARAMS ((const char *));
105 static void init_asm_output
PARAMS ((const char *));
106 static void finalize
PARAMS ((void));
108 static void set_target_switch
PARAMS ((const char *));
110 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
111 static void compile_file
PARAMS ((void));
112 static void display_help
PARAMS ((void));
113 static void display_target_options
PARAMS ((void));
115 static void decode_d_option
PARAMS ((const char *));
116 static int decode_f_option
PARAMS ((const char *));
117 static int decode_W_option
PARAMS ((const char *));
118 static int decode_g_option
PARAMS ((const char *));
119 static unsigned int independent_decode_option
PARAMS ((int, char **));
121 static void print_version
PARAMS ((FILE *, const char *));
122 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
123 const char *, const char *,
124 const char *, const char *));
125 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
126 const char *, const char *));
128 /* Nonzero to dump debug info whilst parsing (-dy option). */
129 static int set_yydebug
;
131 /* Length of line when printing switch values. */
134 /* Name of program invoked, sans directories. */
136 const char *progname
;
138 /* Copy of arguments to toplev_main. */
142 /* Name of current original source file (what was input to cpp).
143 This comes from each #-command in the actual input. */
145 const char *input_filename
;
147 /* Name of top-level original source file (what was input to cpp).
148 This comes from the #-command at the beginning of the actual input.
149 If there isn't any there, then this is the cc1 input file name. */
151 const char *main_input_filename
;
153 /* Current line number in real source file. */
157 /* Nonzero if it is unsafe to create any new pseudo registers. */
160 /* Stack of currently pending input files. */
162 struct file_stack
*input_file_stack
;
164 /* Incremented on each change to input_file_stack. */
165 int input_file_stack_tick
;
167 /* Name to use as base of names for dump output files. */
169 const char *dump_base_name
;
171 /* Format to use to print dumpfile index value */
172 #ifndef DUMPFILE_FORMAT
173 #define DUMPFILE_FORMAT ".%02d."
176 /* Bit flags that specify the machine subtype we are compiling for.
177 Bits are tested using macros TARGET_... defined in the tm.h file
178 and set by `-m...' switches. Must be defined in rtlanal.c. */
180 extern int target_flags
;
182 /* A mask of target_flags that includes bit X if X was set or cleared
183 on the command line. */
185 int target_flags_explicit
;
187 /* Debug hooks - dependent upon command line options. */
189 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
191 /* Describes a dump file. */
193 struct dump_file_info
195 /* The unique extension to apply, e.g. ".jump". */
196 const char *const extension
;
198 /* The -d<c> character that enables this dump file. */
199 char const debug_switch
;
201 /* True if there is a corresponding graph dump file. */
202 char const graph_dump_p
;
204 /* True if the user selected this dump. */
207 /* True if the files have been initialized (ie truncated). */
211 /* Enumerate the extant dump files. */
252 /* Describes all the dump files. Should be kept in order of the
253 pass and in sync with dump_file_index above.
255 Remaining -d letters:
261 static struct dump_file_info dump_file
[DFI_MAX
] =
263 { "rtl", 'r', 0, 0, 0 },
264 { "sibling", 'i', 0, 0, 0 },
265 { "eh", 'h', 0, 0, 0 },
266 { "jump", 'j', 0, 0, 0 },
267 { "ssa", 'e', 1, 0, 0 },
268 { "ssaccp", 'W', 1, 0, 0 },
269 { "ssadce", 'X', 1, 0, 0 },
270 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
271 { "null", 'u', 0, 0, 0 },
272 { "cse", 's', 0, 0, 0 },
273 { "addressof", 'F', 0, 0, 0 },
274 { "gcse", 'G', 1, 0, 0 },
275 { "loop", 'L', 1, 0, 0 },
276 { "cfg", 'f', 1, 0, 0 },
277 { "bp", 'b', 1, 0, 0 },
278 { "tracer", 'T', 1, 0, 0 },
279 { "cse2", 't', 1, 0, 0 },
280 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
281 { "combine", 'c', 1, 0, 0 },
282 { "ce", 'C', 1, 0, 0 },
283 { "regmove", 'N', 1, 0, 0 },
284 { "sched", 'S', 1, 0, 0 },
285 { "lreg", 'l', 1, 0, 0 },
286 { "greg", 'g', 1, 0, 0 },
287 { "postreload", 'o', 1, 0, 0 },
288 { "flow2", 'w', 1, 0, 0 },
289 { "peephole2", 'z', 1, 0, 0 },
290 { "rnreg", 'n', 1, 0, 0 },
291 { "ce2", 'E', 1, 0, 0 },
292 { "sched2", 'R', 1, 0, 0 },
293 { "stack", 'k', 1, 0, 0 },
294 { "bbro", 'B', 1, 0, 0 },
295 { "mach", 'M', 1, 0, 0 },
296 { "dbr", 'd', 0, 0, 0 },
299 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
300 static void close_dump_file
PARAMS ((enum dump_file_index
,
301 void (*) (FILE *, rtx
), rtx
));
303 /* Other flags saying which kinds of debugging dump have been requested. */
305 int rtl_dump_and_exit
;
306 int flag_print_asm_name
;
307 static int version_flag
;
308 static char *filename
;
309 enum graph_dump_types graph_dump_format
;
311 /* Name for output file of assembly code, specified with -o. */
315 /* Value of the -G xx switch, and whether it was passed or not. */
319 /* Type(s) of debugging information we are producing (if any).
320 See flags.h for the definitions of the different possible
321 types of debugging information. */
322 enum debug_info_type write_symbols
= NO_DEBUG
;
324 /* Level of debugging information we are producing. See flags.h
325 for the definitions of the different possible levels. */
326 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
328 /* Nonzero means use GNU-only extensions in the generated symbolic
329 debugging information. */
330 /* Currently, this only has an effect when write_symbols is set to
331 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
332 int use_gnu_debug_info_extensions
= 0;
334 /* Nonzero means do optimizations. -O.
335 Particular numeric values stand for particular amounts of optimization;
336 thus, -O2 stores 2 here. However, the optimizations beyond the basic
337 ones are not controlled directly by this variable. Instead, they are
338 controlled by individual `flag_...' variables that are defaulted
339 based on this variable. */
343 /* Nonzero means optimize for size. -Os.
344 The only valid values are zero and non-zero. When optimize_size is
345 non-zero, optimize defaults to 2, but certain individual code
346 bloating optimizations are disabled. */
348 int optimize_size
= 0;
350 /* Nonzero if we should exit after parsing options. */
351 static int exit_after_options
= 0;
353 /* The FUNCTION_DECL for the function currently being compiled,
354 or 0 if between functions. */
355 tree current_function_decl
;
357 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
359 tree current_function_func_begin_label
;
361 /* Nonzero if doing dwarf2 duplicate elimination. */
363 int flag_eliminate_dwarf2_dups
= 0;
365 /* Nonzero if generating code to do profiling. */
367 int profile_flag
= 0;
369 /* Nonzero if generating code to profile program flow graph arcs. */
371 int profile_arc_flag
= 0;
373 /* Nonzero if we should not attempt to generate thread-safe
374 code to profile program flow graph arcs. */
376 int flag_unsafe_profile_arcs
= 0;
378 /* Nonzero if generating info for gcov to calculate line test coverage. */
380 int flag_test_coverage
= 0;
382 /* Nonzero indicates that branch taken probabilities should be calculated. */
384 int flag_branch_probabilities
= 0;
386 /* Nonzero if basic blocks should be reordered. */
388 int flag_reorder_blocks
= 0;
390 /* Nonzero if functions should be reordered. */
392 int flag_reorder_functions
= 0;
394 /* Nonzero if registers should be renamed. */
396 int flag_rename_registers
= 0;
397 int flag_cprop_registers
= 0;
399 /* Nonzero for -pedantic switch: warn about anything
400 that standard spec forbids. */
404 /* Temporarily suppress certain warnings.
405 This is set while reading code from a system header file. */
407 int in_system_header
= 0;
409 /* Don't print functions as they are compiled. -quiet. */
413 /* Print times taken by the various passes. -ftime-report. */
417 /* Print memory still in use at end of compilation (which may have little
418 to do with peak memory consumption). -fmem-report. */
422 /* Non-zero means to collect statistics which might be expensive
423 and to print them when we are done. */
424 int flag_detailed_statistics
= 0;
429 /* Nonzero means `char' should be signed. */
431 int flag_signed_char
;
433 /* Nonzero means give an enum type only as many bytes as it needs. */
435 int flag_short_enums
;
437 /* Nonzero for -fcaller-saves: allocate values in regs that need to
438 be saved across function calls, if that produces overall better code.
439 Optional now, so people can test it. */
441 #ifdef DEFAULT_CALLER_SAVES
442 int flag_caller_saves
= 1;
444 int flag_caller_saves
= 0;
447 /* Nonzero if structures and unions should be returned in memory.
449 This should only be defined if compatibility with another compiler or
450 with an ABI is needed, because it results in slower code. */
452 #ifndef DEFAULT_PCC_STRUCT_RETURN
453 #define DEFAULT_PCC_STRUCT_RETURN 1
456 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
458 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
460 /* Nonzero for -fforce-mem: load memory value into a register
461 before arithmetic on it. This makes better cse but slower compilation. */
463 int flag_force_mem
= 0;
465 /* Nonzero for -fforce-addr: load memory address into a register before
466 reference to memory. This makes better cse but slower compilation. */
468 int flag_force_addr
= 0;
470 /* Nonzero for -fdefer-pop: don't pop args after each function call;
471 instead save them up to pop many calls' args with one insns. */
473 int flag_defer_pop
= 0;
475 /* Nonzero for -ffloat-store: don't allocate floats and doubles
476 in extended-precision registers. */
478 int flag_float_store
= 0;
480 /* Nonzero for -fcse-follow-jumps:
481 have cse follow jumps to do a more extensive job. */
483 int flag_cse_follow_jumps
;
485 /* Nonzero for -fcse-skip-blocks:
486 have cse follow a branch around a block. */
487 int flag_cse_skip_blocks
;
489 /* Nonzero for -fexpensive-optimizations:
490 perform miscellaneous relatively-expensive optimizations. */
491 int flag_expensive_optimizations
;
493 /* Nonzero for -fthread-jumps:
494 have jump optimize output of loop. */
496 int flag_thread_jumps
;
498 /* Nonzero enables strength-reduction in loop.c. */
500 int flag_strength_reduce
= 0;
502 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
503 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
504 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
507 int flag_unroll_loops
;
509 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
510 This is generally not a win. */
512 int flag_unroll_all_loops
;
514 /* Nonzero enables prefetch optimizations for arrays in loops. */
516 int flag_prefetch_loop_arrays
;
518 /* Nonzero forces all invariant computations in loops to be moved
521 int flag_move_all_movables
= 0;
523 /* Nonzero forces all general induction variables in loops to be
526 int flag_reduce_all_givs
= 0;
528 /* Nonzero to perform full register move optimization passes. This is the
531 int flag_regmove
= 0;
533 /* Nonzero for -fwritable-strings:
534 store string constants in data segment and don't uniquize them. */
536 int flag_writable_strings
= 0;
538 /* Nonzero means don't put addresses of constant functions in registers.
539 Used for compiling the Unix kernel, where strange substitutions are
540 done on the assembly output. */
542 int flag_no_function_cse
= 0;
544 /* Nonzero for -fomit-frame-pointer:
545 don't make a frame pointer in simple functions that don't require one. */
547 int flag_omit_frame_pointer
= 0;
549 /* Nonzero means place each function into its own section on those platforms
550 which support arbitrary section names and unlimited numbers of sections. */
552 int flag_function_sections
= 0;
554 /* ... and similar for data. */
556 int flag_data_sections
= 0;
558 /* Nonzero to inhibit use of define_optimization peephole opts. */
560 int flag_no_peephole
= 0;
562 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
564 int flag_optimize_sibling_calls
= 0;
566 /* Nonzero means the front end generally wants `errno' maintained by math
567 operations, like built-in SQRT. */
569 int flag_errno_math
= 1;
571 /* Nonzero means that unsafe floating-point math optimizations are allowed
572 for the sake of speed. IEEE compliance is not guaranteed, and operations
573 are allowed to assume that their arguments and results are "normal"
574 (e.g., nonnegative for SQRT). */
576 int flag_unsafe_math_optimizations
= 0;
578 /* Nonzero means that no NaNs or +-Infs are expected. */
580 int flag_finite_math_only
= 0;
582 /* Zero means that floating-point math operations cannot generate a
583 (user-visible) trap. This is the case, for example, in nonstop
584 IEEE 754 arithmetic. Trapping conditions include division by zero,
585 overflow, underflow, invalid and inexact, but does not include
586 operations on signaling NaNs (see below). */
588 int flag_trapping_math
= 1;
590 /* Nonzero means disable transformations observable by signaling NaNs.
591 This option implies that any operation on a IEEE signaling NaN can
592 generate a (user-visible) trap. */
594 int flag_signaling_nans
= 0;
596 /* 0 means straightforward implementation of complex divide acceptable.
597 1 means wide ranges of inputs must work for complex divide.
598 2 means C99-like requirements for complex divide (not yet implemented). */
600 int flag_complex_divide_method
= 0;
602 /* Nonzero means all references through pointers are volatile. */
606 /* Nonzero means treat all global and extern variables as volatile. */
608 int flag_volatile_global
;
610 /* Nonzero means treat all static variables as volatile. */
612 int flag_volatile_static
;
614 /* Nonzero means just do syntax checking; don't output anything. */
616 int flag_syntax_only
= 0;
618 /* Nonzero means perform global cse. */
620 static int flag_gcse
;
622 /* Nonzero means perform loop optimizer. */
624 static int flag_loop_optimize
;
626 /* Nonzero means perform crossjumping. */
628 static int flag_crossjumping
;
630 /* Nonzero means perform if conversion. */
632 static int flag_if_conversion
;
634 /* Nonzero means perform if conversion after reload. */
636 static int flag_if_conversion2
;
638 /* Nonzero means to use global dataflow analysis to eliminate
639 useless null pointer tests. */
641 static int flag_delete_null_pointer_checks
;
643 /* Nonzero means to do the enhanced load motion during gcse, which trys
644 to hoist loads by not killing them when a store to the same location
647 int flag_gcse_lm
= 1;
649 /* Nonzero means to perform store motion after gcse, which will try to
650 move stores closer to the exit block. Its not very effective without
653 int flag_gcse_sm
= 1;
655 /* Nonzero means to rerun cse after loop optimization. This increases
656 compilation time about 20% and picks up a few more common expressions. */
658 static int flag_rerun_cse_after_loop
;
660 /* Nonzero means to run loop optimizations twice. */
662 int flag_rerun_loop_opt
;
664 /* Nonzero for -finline-functions: ok to inline functions that look like
665 good inline candidates. */
667 int flag_inline_functions
;
669 /* Nonzero for -fkeep-inline-functions: even if we make a function
670 go inline everywhere, keep its definition around for debugging
673 int flag_keep_inline_functions
;
675 /* Nonzero means that functions will not be inlined. */
677 int flag_no_inline
= 2;
679 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
680 not just because the tree inliner turned us off. */
682 int flag_really_no_inline
= 2;
684 /* Nonzero means that we should emit static const variables
685 regardless of whether or not optimization is turned on. */
687 int flag_keep_static_consts
= 1;
689 /* Nonzero means we should be saving declaration info into a .X file. */
691 int flag_gen_aux_info
= 0;
693 /* Specified name of aux-info file. */
695 static char *aux_info_file_name
;
697 /* Nonzero means make the text shared if supported. */
699 int flag_shared_data
;
701 /* Nonzero means schedule into delayed branch slots if supported. */
703 int flag_delayed_branch
;
705 /* Nonzero if we are compiling pure (sharable) code.
706 Value is 1 if we are doing "small" pic; value is 2 if we're doing
711 /* Set to the default thread-local storage (tls) model to use. */
713 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
715 /* Nonzero means generate extra code for exception handling and enable
716 exception handling. */
720 /* Nonzero means generate frame unwind info table when supported. */
722 int flag_unwind_tables
= 0;
724 /* Nonzero means generate frame unwind info table exact at each insn boundary */
726 int flag_asynchronous_unwind_tables
= 0;
728 /* Nonzero means don't place uninitialized global data in common storage
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;
804 /* Nonzero means put zero initialized data in the bss section. */
805 int flag_zero_initialized_in_bss
= 1;
810 /* Enable ssa conditional constant propagation. */
811 int flag_ssa_ccp
= 0;
813 /* Enable ssa aggressive dead code elimination. */
814 int flag_ssa_dce
= 0;
816 /* Tag all structures with __attribute__(packed). */
817 int flag_pack_struct
= 0;
819 /* Emit code to check for stack overflow; also may cause large objects
820 to be allocated dynamically. */
821 int flag_stack_check
;
823 /* When non-NULL, indicates that whenever space is allocated on the
824 stack, the resulting stack pointer must not pass this
825 address---that is, for stacks that grow downward, the stack pointer
826 must always be greater than or equal to this address; for stacks
827 that grow upward, the stack pointer must be less than this address.
828 At present, the rtx may be either a REG or a SYMBOL_REF, although
829 the support provided depends on the backend. */
832 /* 0 if pointer arguments may alias each other. True in C.
833 1 if pointer arguments may not alias each other but may alias
835 2 if pointer arguments may not alias each other and may not
836 alias global variables. True in Fortran.
837 This defaults to 0 for C. */
838 int flag_argument_noalias
= 0;
840 /* Nonzero if we should do (language-dependent) alias analysis.
841 Typically, this analysis will assume that expressions of certain
842 types do not alias expressions of certain other types. Only used
843 if alias analysis (in general) is enabled. */
844 int flag_strict_aliasing
= 0;
846 /* Instrument functions with calls at entry and exit, for profiling. */
847 int flag_instrument_function_entry_exit
= 0;
849 /* Nonzero means ignore `#ident' directives. 0 means handle them.
850 On SVR4 targets, it also controls whether or not to emit a
851 string identifying the compiler. */
853 int flag_no_ident
= 0;
855 /* This will perform a peephole pass before sched2. */
856 int flag_peephole2
= 0;
858 /* This will try to guess branch probabilities. */
859 int flag_guess_branch_prob
= 0;
861 /* -fbounded-pointers causes gcc to compile pointers as composite
862 objects occupying three words: the pointer value, the base address
863 of the referent object, and the address immediately beyond the end
864 of the referent object. The base and extent allow us to perform
865 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
866 int flag_bounded_pointers
= 0;
868 /* -fcheck-bounds causes gcc to generate array bounds checks.
869 For C, C++: defaults to value of flag_bounded_pointers.
870 For ObjC: defaults to off.
871 For Java: defaults to on.
872 For Fortran: defaults to off.
873 For CHILL: defaults to off. */
874 int flag_bounds_check
= 0;
876 /* This will attempt to merge constant section constants, if 1 only
877 string constants and constants from constant pool, if 2 also constant
879 int flag_merge_constants
= 1;
881 /* If one, renumber instruction UIDs to reduce the number of
882 unused UIDs if there are a lot of instructions. If greater than
883 one, unconditionally renumber instruction UIDs. */
884 int flag_renumber_insns
= 1;
886 /* If nonzero, use the graph coloring register allocator. */
887 int flag_new_regalloc
= 0;
889 /* Nonzero if we perform superblock formation. */
893 /* Values of the -falign-* flags: how much to align labels in code.
894 0 means `use default', 1 means `don't align'.
895 For each variable, there is an _log variant which is the power
896 of two not less than the variable, for .align output. */
900 int align_loops_max_skip
;
903 int align_jumps_max_skip
;
905 int align_labels_log
;
906 int align_labels_max_skip
;
908 int align_functions_log
;
910 /* Table of supported debugging formats. */
913 const char *const arg
;
914 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
915 constant expression, we use NO_DEBUG in its place. */
916 const enum debug_info_type debug_type
;
917 const int use_extensions_p
;
918 const char *const description
;
922 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
923 N_("Generate debugging info in default format") },
924 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
925 #ifdef DBX_DEBUGGING_INFO
926 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
927 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
929 #ifdef DWARF_DEBUGGING_INFO
930 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
931 { "dwarf+", DWARF_DEBUG
, 1,
932 N_("Generate extended DWARF-1 format debug info") },
934 #ifdef DWARF2_DEBUGGING_INFO
935 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
937 #ifdef XCOFF_DEBUGGING_INFO
938 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
939 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
941 #ifdef SDB_DEBUGGING_INFO
942 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
944 #ifdef VMS_DEBUGGING_INFO
945 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
952 const char *const string
;
955 const char *const description
;
957 lang_independent_options
;
961 /* Add or remove a leading underscore from user symbols. */
962 int flag_leading_underscore
= -1;
964 /* The user symbol prefix after having resolved same. */
965 const char *user_label_prefix
;
967 static const param_info lang_independent_params
[] = {
968 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
969 { OPTION, DEFAULT, HELP },
970 #include "params.def"
975 /* A default for same. */
976 #ifndef USER_LABEL_PREFIX
977 #define USER_LABEL_PREFIX ""
980 /* Table of language-independent -f options.
981 STRING is the option name. VARIABLE is the address of the variable.
982 ON_VALUE is the value to store in VARIABLE
983 if `-fSTRING' is seen as an option.
984 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
986 static const lang_independent_options f_options
[] =
988 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
989 N_("Perform DWARF2 duplicate elimination") },
990 {"float-store", &flag_float_store
, 1,
991 N_("Do not store floats in registers") },
992 {"volatile", &flag_volatile
, 1,
993 N_("Consider all mem refs through pointers as volatile") },
994 {"volatile-global", &flag_volatile_global
, 1,
995 N_("Consider all mem refs to global data to be volatile") },
996 {"volatile-static", &flag_volatile_static
, 1,
997 N_("Consider all mem refs to static data to be volatile") },
998 {"defer-pop", &flag_defer_pop
, 1,
999 N_("Defer popping functions args from stack until later") },
1000 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1001 N_("When possible do not generate stack frames") },
1002 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1003 N_("Optimize sibling and tail recursive calls") },
1004 {"tracer", &flag_tracer
, 1,
1005 N_("Perform superblock formation via tail duplication") },
1006 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1007 N_("When running CSE, follow jumps to their targets") },
1008 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1009 N_("When running CSE, follow conditional jumps") },
1010 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1011 N_("Perform a number of minor, expensive optimizations") },
1012 {"thread-jumps", &flag_thread_jumps
, 1,
1013 N_("Perform jump threading optimizations") },
1014 {"strength-reduce", &flag_strength_reduce
, 1,
1015 N_("Perform strength reduction optimizations") },
1016 {"unroll-loops", &flag_unroll_loops
, 1,
1017 N_("Perform loop unrolling when iteration count is known") },
1018 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1019 N_("Perform loop unrolling for all loops") },
1020 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
1021 N_("Generate prefetch instructions, if available, for arrays in loops") },
1022 {"move-all-movables", &flag_move_all_movables
, 1,
1023 N_("Force all loop invariant computations out of loops") },
1024 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1025 N_("Strength reduce all loop general induction variables") },
1026 {"writable-strings", &flag_writable_strings
, 1,
1027 N_("Store strings in writable data section") },
1028 {"peephole", &flag_no_peephole
, 0,
1029 N_("Enable machine specific peephole optimizations") },
1030 {"force-mem", &flag_force_mem
, 1,
1031 N_("Copy memory operands into registers before using") },
1032 {"force-addr", &flag_force_addr
, 1,
1033 N_("Copy memory address constants into regs before using") },
1034 {"function-cse", &flag_no_function_cse
, 0,
1035 N_("Allow function addresses to be held in registers") },
1036 {"inline-functions", &flag_inline_functions
, 1,
1037 N_("Integrate simple functions into their callers") },
1038 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1039 N_("Generate code for funcs even if they are fully inlined") },
1040 {"inline", &flag_no_inline
, 0,
1041 N_("Pay attention to the 'inline' keyword") },
1042 {"keep-static-consts", &flag_keep_static_consts
, 1,
1043 N_("Emit static const variables even if they are not used") },
1044 {"syntax-only", &flag_syntax_only
, 1,
1045 N_("Check for syntax errors, then stop") },
1046 {"shared-data", &flag_shared_data
, 1,
1047 N_("Mark data as shared rather than private") },
1048 {"caller-saves", &flag_caller_saves
, 1,
1049 N_("Enable saving registers around function calls") },
1050 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1051 N_("Return 'short' aggregates in memory, not registers") },
1052 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1053 N_("Return 'short' aggregates in registers") },
1054 {"delayed-branch", &flag_delayed_branch
, 1,
1055 N_("Attempt to fill delay slots of branch instructions") },
1056 {"gcse", &flag_gcse
, 1,
1057 N_("Perform the global common subexpression elimination") },
1058 {"gcse-lm", &flag_gcse_lm
, 1,
1059 N_("Perform enhanced load motion during global subexpression elimination") },
1060 {"gcse-sm", &flag_gcse_sm
, 1,
1061 N_("Perform store motion after global subexpression elimination") },
1062 {"loop-optimize", &flag_loop_optimize
, 1,
1063 N_("Perform the loop optimizations") },
1064 {"crossjumping", &flag_crossjumping
, 1,
1065 N_("Perform cross-jumping optimization") },
1066 {"if-conversion", &flag_if_conversion
, 1,
1067 N_("Perform conversion of conditional jumps to branchless equivalents") },
1068 {"if-conversion2", &flag_if_conversion2
, 1,
1069 N_("Perform conversion of conditional jumps to conditional execution") },
1070 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1071 N_("Run CSE pass after loop optimizations") },
1072 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1073 N_("Run the loop optimizer twice") },
1074 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1075 N_("Delete useless null pointer checks") },
1076 {"schedule-insns", &flag_schedule_insns
, 1,
1077 N_("Reschedule instructions before register allocation") },
1078 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1079 N_("Reschedule instructions after register allocation") },
1080 {"sched-interblock",&flag_schedule_interblock
, 1,
1081 N_("Enable scheduling across basic blocks") },
1082 {"sched-spec",&flag_schedule_speculative
, 1,
1083 N_("Allow speculative motion of non-loads") },
1084 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1085 N_("Allow speculative motion of some loads") },
1086 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1087 N_("Allow speculative motion of more loads") },
1088 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1089 N_("Replace add,compare,branch with branch on count reg") },
1090 {"pic", &flag_pic
, 1,
1091 N_("Generate position independent code, if possible") },
1092 {"PIC", &flag_pic
, 2, ""},
1093 {"exceptions", &flag_exceptions
, 1,
1094 N_("Enable exception handling") },
1095 {"unwind-tables", &flag_unwind_tables
, 1,
1096 N_("Just generate unwind tables for exception handling") },
1097 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1098 N_("Generate unwind tables exact at each instruction boundary") },
1099 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1100 N_("Support synchronous non-call exceptions") },
1101 {"profile-arcs", &profile_arc_flag
, 1,
1102 N_("Insert arc based program profiling code") },
1103 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs
, 1,
1104 N_("Avoid thread safety profiling overhead") },
1105 {"test-coverage", &flag_test_coverage
, 1,
1106 N_("Create data files needed by gcov") },
1107 {"branch-probabilities", &flag_branch_probabilities
, 1,
1108 N_("Use profiling information for branch probabilities") },
1109 {"profile", &profile_flag
, 1,
1110 N_("Enable basic program profiling code") },
1111 {"reorder-blocks", &flag_reorder_blocks
, 1,
1112 N_("Reorder basic blocks to improve code placement") },
1113 {"reorder-functions", &flag_reorder_functions
, 1,
1114 N_("Reorder functions to improve code placement") },
1115 {"rename-registers", &flag_rename_registers
, 1,
1116 N_("Do the register renaming optimization pass") },
1117 {"cprop-registers", &flag_cprop_registers
, 1,
1118 N_("Do the register copy-propagation optimization pass") },
1119 {"common", &flag_no_common
, 0,
1120 N_("Do not put uninitialized globals in the common section") },
1121 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1122 N_("Do not generate .size directives") },
1123 {"function-sections", &flag_function_sections
, 1,
1124 N_("place each function into its own section") },
1125 {"data-sections", &flag_data_sections
, 1,
1126 N_("place data items into their own section") },
1127 {"verbose-asm", &flag_verbose_asm
, 1,
1128 N_("Add extra commentry to assembler output") },
1129 {"gnu-linker", &flag_gnu_linker
, 1,
1130 N_("Output GNU ld formatted global initializers") },
1131 {"regmove", &flag_regmove
, 1,
1132 N_("Enables a register move optimization") },
1133 {"optimize-register-move", &flag_regmove
, 1,
1134 N_("Do the full regmove optimization pass") },
1135 {"pack-struct", &flag_pack_struct
, 1,
1136 N_("Pack structure members together without holes") },
1137 {"stack-check", &flag_stack_check
, 1,
1138 N_("Insert stack checking code into the program") },
1139 {"argument-alias", &flag_argument_noalias
, 0,
1140 N_("Specify that arguments may alias each other & globals") },
1141 {"argument-noalias", &flag_argument_noalias
, 1,
1142 N_("Assume arguments may alias globals but not each other") },
1143 {"argument-noalias-global", &flag_argument_noalias
, 2,
1144 N_("Assume arguments do not alias each other or globals") },
1145 {"strict-aliasing", &flag_strict_aliasing
, 1,
1146 N_("Assume strict aliasing rules apply") },
1147 {"align-loops", &align_loops
, 0,
1148 N_("Align the start of loops") },
1149 {"align-jumps", &align_jumps
, 0,
1150 N_("Align labels which are only reached by jumping") },
1151 {"align-labels", &align_labels
, 0,
1152 N_("Align all labels") },
1153 {"align-functions", &align_functions
, 0,
1154 N_("Align the start of functions") },
1155 {"merge-constants", &flag_merge_constants
, 1,
1156 N_("Attempt to merge identical constants accross compilation units") },
1157 {"merge-all-constants", &flag_merge_constants
, 2,
1158 N_("Attempt to merge identical constants and constant variables") },
1159 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1160 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1161 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1162 N_("Instrument function entry/exit with profiling calls") },
1163 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1,
1164 N_("Put zero initialized data in the bss section") },
1165 {"ssa", &flag_ssa
, 1,
1166 N_("Enable SSA optimizations") },
1167 {"ssa-ccp", &flag_ssa_ccp
, 1,
1168 N_("Enable SSA conditional constant propagation") },
1169 {"ssa-dce", &flag_ssa_dce
, 1,
1170 N_("Enable aggressive SSA dead code elimination") },
1171 {"leading-underscore", &flag_leading_underscore
, 1,
1172 N_("External symbols have a leading underscore") },
1173 {"ident", &flag_no_ident
, 0,
1174 N_("Process #ident directives") },
1175 { "peephole2", &flag_peephole2
, 1,
1176 N_("Enables an rtl peephole pass run before sched2") },
1177 {"finite-math-only", &flag_finite_math_only
, 1,
1178 N_("Assume no NaNs or +-Infs are generated") },
1179 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1180 N_("Enables guessing of branch probabilities") },
1181 {"math-errno", &flag_errno_math
, 1,
1182 N_("Set errno after built-in math functions") },
1183 {"trapping-math", &flag_trapping_math
, 1,
1184 N_("Floating-point operations can trap") },
1185 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1186 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1187 {"signaling-nans", &flag_signaling_nans
, 1,
1188 N_("Disable optimizations observable by IEEE signaling NaNs") },
1189 {"bounded-pointers", &flag_bounded_pointers
, 1,
1190 N_("Compile pointers as triples: value, base & end") },
1191 {"bounds-check", &flag_bounds_check
, 1,
1192 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1193 {"single-precision-constant", &flag_single_precision_constant
, 1,
1194 N_("Convert floating point constant to single precision constant") },
1195 {"time-report", &time_report
, 1,
1196 N_("Report time taken by each compiler pass at end of run") },
1197 {"mem-report", &mem_report
, 1,
1198 N_("Report on permanent memory allocation at end of run") },
1199 { "trapv", &flag_trapv
, 1,
1200 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1201 { "new-ra", &flag_new_regalloc
, 1,
1202 N_("Use graph coloring register allocation.") },
1205 /* Table of language-specific options. */
1207 static const struct lang_opt
1209 const char *const option
;
1210 const char *const description
;
1212 documented_lang_options
[] =
1214 /* In order not to overload the --help output, the convention
1215 used here is to only describe those options which are not
1216 enabled by default. */
1219 N_("Compile just for ISO C90") },
1221 N_("Determine language standard") },
1223 { "-fsigned-bitfields", "" },
1224 { "-funsigned-bitfields",
1225 N_("Make bit-fields by unsigned by default") },
1226 { "-fno-signed-bitfields", "" },
1227 { "-fno-unsigned-bitfields","" },
1229 N_("Make 'char' be signed by default") },
1230 { "-funsigned-char",
1231 N_("Make 'char' be unsigned by default") },
1232 { "-fno-signed-char", "" },
1233 { "-fno-unsigned-char", "" },
1237 N_("Do not recognize the 'asm' keyword") },
1238 { "-fbuiltin", "" },
1240 N_("Do not recognize any built in functions") },
1242 N_("Assume normal C execution environment") },
1243 { "-fno-hosted", "" },
1245 N_("Assume that standard libraries & main might not exist") },
1246 { "-fno-freestanding", "" },
1247 { "-fcond-mismatch",
1248 N_("Allow different types as args of ? operator") },
1249 { "-fno-cond-mismatch", "" },
1250 { "-fdollars-in-identifiers",
1251 N_("Allow the use of $ inside identifiers") },
1252 { "-fno-dollars-in-identifiers", "" },
1253 { "-fpreprocessed", "" },
1254 { "-fno-preprocessed", "" },
1256 N_("Use the same size for double as for float") },
1257 { "-fno-short-double", "" },
1259 N_("Use the smallest fitting integer to hold enums") },
1260 { "-fno-short-enums", "" },
1262 N_("Override the underlying type for wchar_t to `unsigned short'") },
1263 { "-fno-short-wchar", "" },
1266 N_("Enable most warning messages") },
1267 { "-Wbad-function-cast",
1268 N_("Warn about casting functions to incompatible types") },
1269 { "-Wno-bad-function-cast", "" },
1270 { "-Wmissing-format-attribute",
1271 N_("Warn about functions which might be candidates for format attributes") },
1272 { "-Wno-missing-format-attribute", "" },
1274 N_("Warn about casts which discard qualifiers") },
1275 { "-Wno-cast-qual", "" },
1276 { "-Wchar-subscripts",
1277 N_("Warn about subscripts whose type is 'char'") },
1278 { "-Wno-char-subscripts", "" },
1280 N_("Warn if nested comments are detected") },
1281 { "-Wno-comment", "" },
1283 N_("Warn if nested comments are detected") },
1284 { "-Wno-comments", "" },
1286 N_("Warn about possibly confusing type conversions") },
1287 { "-Wno-conversion", "" },
1288 { "-Wdiv-by-zero", "" },
1289 { "-Wno-div-by-zero",
1290 N_("Do not warn about compile-time integer division by zero") },
1292 N_("Warn about testing equality of floating point numbers") },
1293 { "-Wno-float-equal", "" },
1295 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1296 { "-Wno-format", "" },
1297 { "-Wformat-extra-args", "" },
1298 { "-Wno-format-extra-args",
1299 N_("Don't warn about too many arguments to format functions") },
1300 { "-Wformat-nonliteral",
1301 N_("Warn about non-string-literal format strings") },
1302 { "-Wno-format-nonliteral", "" },
1303 { "-Wformat-security",
1304 N_("Warn about possible security problems with format functions") },
1305 { "-Wno-format-security", "" },
1306 { "-Wformat-y2k", "" },
1307 { "-Wno-format-y2k",
1308 N_("Don't warn about strftime formats yielding 2 digit years") },
1309 { "-Wimplicit-function-declaration",
1310 N_("Warn about implicit function declarations") },
1311 { "-Wno-implicit-function-declaration", "" },
1312 { "-Werror-implicit-function-declaration", "" },
1314 N_("Warn when a declaration does not specify a type") },
1315 { "-Wno-implicit-int", "" },
1316 { "-Wimplicit", "" },
1317 { "-Wno-implicit", "" },
1319 N_("Warn about the use of the #import directive") },
1320 { "-Wno-import", "" },
1321 { "-Wlong-long","" },
1323 N_("Do not warn about using 'long long' when -pedantic") },
1325 N_("Warn about suspicious declarations of main") },
1326 { "-Wno-main", "" },
1327 { "-Wmissing-braces",
1328 N_("Warn about possibly missing braces around initializers") },
1329 { "-Wno-missing-braces", "" },
1330 { "-Wmissing-declarations",
1331 N_("Warn about global funcs without previous declarations") },
1332 { "-Wno-missing-declarations", "" },
1333 { "-Wmissing-prototypes",
1334 N_("Warn about global funcs without prototypes") },
1335 { "-Wno-missing-prototypes", "" },
1337 N_("Warn about use of multicharacter literals") },
1338 { "-Wno-multichar", "" },
1339 { "-Wnested-externs",
1340 N_("Warn about externs not at file scope level") },
1341 { "-Wno-nested-externs", "" },
1343 N_("Warn about possible missing parentheses") },
1344 { "-Wno-parentheses", "" },
1345 { "-Wpointer-arith",
1346 N_("Warn about function pointer arithmetic") },
1347 { "-Wno-pointer-arith", "" },
1348 { "-Wredundant-decls",
1349 N_("Warn about multiple declarations of the same object") },
1350 { "-Wno-redundant-decls", "" },
1352 N_("Warn whenever a function's return-type defaults to int") },
1353 { "-Wno-return-type", "" },
1354 { "-Wsequence-point",
1355 N_("Warn about possible violations of sequence point rules") },
1356 { "-Wno-sequence-point", "" },
1358 N_("Warn about signed/unsigned comparisons") },
1359 { "-Wno-sign-compare", "" },
1360 { "-Wstrict-prototypes",
1361 N_("Warn about non-prototyped function decls") },
1362 { "-Wno-strict-prototypes", "" },
1364 N_("Warn about constructs whose meanings change in ISO C") },
1365 { "-Wno-traditional", "" },
1367 N_("Warn when trigraphs are encountered") },
1368 { "-Wno-trigraphs", "" },
1370 { "-Wno-undef", "" },
1371 { "-Wunknown-pragmas",
1372 N_("Warn about unrecognized pragmas") },
1373 { "-Wno-unknown-pragmas", "" },
1374 { "-Wwrite-strings",
1375 N_("Mark strings as 'const char *'") },
1376 { "-Wno-write-strings", "" },
1378 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1380 #include "options.h"
1384 /* Here is a table, controlled by the tm.h file, listing each -m switch
1385 and which bits in `target_switches' it should set or clear.
1386 If VALUE is positive, it is bits to set.
1387 If VALUE is negative, -VALUE is bits to clear.
1388 (The sign bit is not used so there is no confusion.) */
1392 const char *const name
;
1394 const char *const description
;
1396 target_switches
[] = TARGET_SWITCHES
;
1398 /* This table is similar, but allows the switch to have a value. */
1400 #ifdef TARGET_OPTIONS
1403 const char *const prefix
;
1404 const char **const variable
;
1405 const char *const description
;
1407 target_options
[] = TARGET_OPTIONS
;
1410 /* Options controlling warnings. */
1412 /* Don't print warning messages. -w. */
1414 int inhibit_warnings
= 0;
1416 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1418 int warn_system_headers
= 0;
1420 /* Print various extra warnings. -W. */
1422 int extra_warnings
= 0;
1424 /* Treat warnings as errors. -Werror. */
1426 int warnings_are_errors
= 0;
1428 /* Nonzero to warn about unused variables, functions et.al. */
1430 int warn_unused_function
;
1431 int warn_unused_label
;
1432 int warn_unused_parameter
;
1433 int warn_unused_variable
;
1434 int warn_unused_value
;
1436 /* Nonzero to warn about code which is never reached. */
1438 int warn_notreached
;
1440 /* Nonzero to warn about variables used before they are initialized. */
1442 int warn_uninitialized
;
1444 /* Nonzero means warn about all declarations which shadow others. */
1448 /* Warn if a switch on an enum, that does not have a default case,
1449 fails to have a case for every enum value. */
1453 /* Warn if a switch does not have a default case. */
1455 int warn_switch_default
;
1457 /* Warn if a switch on an enum fails to have a case for every enum
1458 value (regardless of the presence or otherwise of a default case). */
1460 int warn_switch_enum
;
1462 /* Nonzero means warn about function definitions that default the return type
1463 or that use a null return and have a return-type other than void. */
1465 int warn_return_type
;
1467 /* Nonzero means warn about pointer casts that increase the required
1468 alignment of the target type (and might therefore lead to a crash
1469 due to a misaligned access). */
1471 int warn_cast_align
;
1473 /* Nonzero means warn about any objects definitions whose size is larger
1474 than N bytes. Also want about function definitions whose returned
1475 values are larger than N bytes. The value N is in `larger_than_size'. */
1477 int warn_larger_than
;
1478 HOST_WIDE_INT larger_than_size
;
1480 /* Nonzero means warn if inline function is too large. */
1484 /* Warn if a function returns an aggregate,
1485 since there are often incompatible calling conventions for doing this. */
1487 int warn_aggregate_return
;
1489 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1493 /* Warn when gcc pads a structure to an alignment boundary. */
1497 /* Warn when an optimization pass is disabled. */
1499 int warn_disabled_optimization
;
1501 /* Warn about functions which might be candidates for attribute noreturn. */
1503 int warn_missing_noreturn
;
1505 /* Nonzero means warn about uses of __attribute__((deprecated))
1508 int warn_deprecated_decl
= 1;
1510 /* Likewise for -W. */
1512 static const lang_independent_options W_options
[] =
1514 {"unused-function", &warn_unused_function
, 1,
1515 N_("Warn when a function is unused") },
1516 {"unused-label", &warn_unused_label
, 1,
1517 N_("Warn when a label is unused") },
1518 {"unused-parameter", &warn_unused_parameter
, 1,
1519 N_("Warn when a function parameter is unused") },
1520 {"unused-variable", &warn_unused_variable
, 1,
1521 N_("Warn when a variable is unused") },
1522 {"unused-value", &warn_unused_value
, 1,
1523 N_("Warn when an expression value is unused") },
1524 {"system-headers", &warn_system_headers
, 1,
1525 N_("Do not suppress warnings from system headers") },
1526 {"error", &warnings_are_errors
, 1,
1527 N_("Treat all warnings as errors") },
1528 {"shadow", &warn_shadow
, 1,
1529 N_("Warn when one local variable shadows another") },
1530 {"switch", &warn_switch
, 1,
1531 N_("Warn about enumerated switches, with no default, missing a case") },
1532 {"switch-default", &warn_switch_default
, 1,
1533 N_("Warn about enumerated switches missing a default case") },
1534 {"switch-enum", &warn_switch_enum
, 1,
1535 N_("Warn about all enumerated switches missing a specific case") },
1536 {"aggregate-return", &warn_aggregate_return
, 1,
1537 N_("Warn about returning structures, unions or arrays") },
1538 {"cast-align", &warn_cast_align
, 1,
1539 N_("Warn about pointer casts which increase alignment") },
1540 {"unreachable-code", &warn_notreached
, 1,
1541 N_("Warn about code that will never be executed") },
1542 {"uninitialized", &warn_uninitialized
, 1,
1543 N_("Warn about uninitialized automatic variables") },
1544 {"inline", &warn_inline
, 1,
1545 N_("Warn when an inlined function cannot be inlined") },
1546 {"packed", &warn_packed
, 1,
1547 N_("Warn when the packed attribute has no effect on struct layout") },
1548 {"padded", &warn_padded
, 1,
1549 N_("Warn when padding is required to align struct members") },
1550 {"disabled-optimization", &warn_disabled_optimization
, 1,
1551 N_("Warn when an optimization pass is disabled") },
1552 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1553 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1554 {"missing-noreturn", &warn_missing_noreturn
, 1,
1555 N_("Warn about functions which might be candidates for attribute noreturn") }
1559 set_Wunused (setting
)
1562 warn_unused_function
= setting
;
1563 warn_unused_label
= setting
;
1564 /* Unused function parameter warnings are reported when either ``-W
1565 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1566 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1568 warn_unused_parameter
= 0;
1569 else if (!warn_unused_parameter
)
1570 warn_unused_parameter
= -1;
1571 warn_unused_variable
= setting
;
1572 warn_unused_value
= setting
;
1575 /* The following routines are useful in setting all the flags that
1576 -ffast-math and -fno-fast-math imply. */
1579 set_fast_math_flags (set
)
1582 flag_trapping_math
= !set
;
1583 flag_unsafe_math_optimizations
= set
;
1584 flag_finite_math_only
= set
;
1585 flag_errno_math
= !set
;
1587 flag_signaling_nans
= 0;
1590 /* Return true iff flags are set as if -ffast-math. */
1592 fast_math_flags_set_p ()
1594 return (!flag_trapping_math
1595 && flag_unsafe_math_optimizations
1596 && flag_finite_math_only
1597 && !flag_errno_math
);
1601 /* Output files for assembler code (real compiler output)
1602 and debugging dumps. */
1605 FILE *aux_info_file
;
1606 FILE *rtl_dump_file
= NULL
;
1608 /* Decode the string P as an integral parameter.
1609 If the string is indeed an integer return its numeric value else
1610 issue an Invalid Option error for the option PNAME and return DEFVAL.
1611 If PNAME is zero just return DEFVAL, do not call error. */
1614 read_integral_parameter (p
, pname
, defval
)
1619 const char *endp
= p
;
1623 if (ISDIGIT (*endp
))
1632 error ("invalid option `%s'", pname
);
1639 /* This calls abort and is used to avoid problems when abort if a macro.
1640 It is used when we need to pass the address of abort. */
1648 /* When `malloc.c' is compiled with `rcheck' defined,
1649 it calls this function to report clobberage. */
1653 const char *s ATTRIBUTE_UNUSED
;
1658 /* Return the logarithm of X, base 2, considering X unsigned,
1659 if X is a power of 2. Otherwise, returns -1.
1661 This should be used via the `exact_log2' macro. */
1665 unsigned HOST_WIDE_INT x
;
1668 /* Test for 0 or a power of 2. */
1669 if (x
== 0 || x
!= (x
& -x
))
1671 while ((x
>>= 1) != 0)
1676 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1677 If X is 0, return -1.
1679 This should be used via the floor_log2 macro. */
1683 unsigned HOST_WIDE_INT x
;
1692 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1693 into ICE messages, which is much more user friendly. */
1696 crash_signal (signo
)
1699 internal_error ("internal error: %s", strsignal (signo
));
1702 /* Strip off a legitimate source ending from the input string NAME of
1703 length LEN. Rather than having to know the names used by all of
1704 our front ends, we strip off an ending of a period followed by
1705 up to five characters. (Java uses ".class".) */
1708 strip_off_ending (name
, len
)
1713 for (i
= 2; i
< 6 && len
> i
; i
++)
1715 if (name
[len
- i
] == '.')
1717 name
[len
- i
] = '\0';
1723 /* Output a quoted string. */
1726 output_quoted_string (asm_file
, string
)
1730 #ifdef OUTPUT_QUOTED_STRING
1731 OUTPUT_QUOTED_STRING (asm_file
, string
);
1735 putc ('\"', asm_file
);
1736 while ((c
= *string
++) != 0)
1740 if (c
== '\"' || c
== '\\')
1741 putc ('\\', asm_file
);
1745 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1747 putc ('\"', asm_file
);
1751 /* Output NAME into FILE after having turned it into something
1752 usable as an identifier in a target's assembly file. */
1754 output_clean_symbol_name (file
, name
)
1758 /* Make a copy of NAME. */
1759 char *id
= xstrdup (name
);
1761 /* Make it look like a valid identifier for an assembler. */
1762 clean_symbol_name (id
);
1769 /* Output a file name in the form wanted by System V. */
1772 output_file_directive (asm_file
, input_name
)
1774 const char *input_name
;
1776 int len
= strlen (input_name
);
1777 const char *na
= input_name
+ len
;
1779 /* NA gets INPUT_NAME sans directory names. */
1780 while (na
> input_name
)
1782 if (IS_DIR_SEPARATOR (na
[-1]))
1787 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1788 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1790 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1791 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1793 fprintf (asm_file
, "\t.file\t");
1794 output_quoted_string (asm_file
, na
);
1795 fputc ('\n', asm_file
);
1800 /* Routine to open a dump file. Return true if the dump file is enabled. */
1803 open_dump_file (index
, decl
)
1804 enum dump_file_index index
;
1808 const char *open_arg
;
1811 if (! dump_file
[index
].enabled
)
1814 timevar_push (TV_DUMP
);
1815 if (rtl_dump_file
!= NULL
)
1816 fclose (rtl_dump_file
);
1818 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1820 if (! dump_file
[index
].initialized
)
1822 /* If we've not initialized the files, do so now. */
1823 if (graph_dump_format
!= no_graph
1824 && dump_file
[index
].graph_dump_p
)
1826 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1827 clean_graph_dump_file (dump_base_name
, dump_name
);
1830 dump_file
[index
].initialized
= 1;
1836 dump_name
= concat (dump_base_name
, seq
,
1837 dump_file
[index
].extension
, NULL
);
1839 rtl_dump_file
= fopen (dump_name
, open_arg
);
1840 if (rtl_dump_file
== NULL
)
1841 fatal_io_error ("can't open %s", dump_name
);
1846 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1847 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1848 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1850 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1851 ? " (unlikely executed)"
1854 timevar_pop (TV_DUMP
);
1858 /* Routine to close a dump file. */
1861 close_dump_file (index
, func
, insns
)
1862 enum dump_file_index index
;
1863 void (*func
) PARAMS ((FILE *, rtx
));
1866 if (! rtl_dump_file
)
1869 timevar_push (TV_DUMP
);
1871 && graph_dump_format
!= no_graph
1872 && dump_file
[index
].graph_dump_p
)
1877 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1878 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1879 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1884 func (rtl_dump_file
, insns
);
1886 fflush (rtl_dump_file
);
1887 fclose (rtl_dump_file
);
1889 rtl_dump_file
= NULL
;
1890 timevar_pop (TV_DUMP
);
1893 /* Do any final processing required for the declarations in VEC, of
1894 which there are LEN. We write out inline functions and variables
1895 that have been deferred until this point, but which are required.
1896 Returns non-zero if anything was put out. */
1899 wrapup_global_declarations (vec
, len
)
1906 int output_something
= 0;
1908 for (i
= 0; i
< len
; i
++)
1912 /* We're not deferring this any longer. */
1913 DECL_DEFER_OUTPUT (decl
) = 0;
1915 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1916 (*lang_hooks
.finish_incomplete_decl
) (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
))
1961 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1963 else if (DECL_COMDAT (decl
))
1965 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1966 && (optimize
|| !flag_keep_static_consts
1967 || DECL_ARTIFICIAL (decl
)))
1973 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1977 if (TREE_CODE (decl
) == FUNCTION_DECL
1978 && DECL_INITIAL (decl
) != 0
1979 && DECL_SAVED_INSNS (decl
) != 0
1980 && (flag_keep_inline_functions
1981 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1982 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1985 output_inline_function (decl
);
1990 output_something
= 1;
1994 return output_something
;
1997 /* Issue appropriate warnings for the global declarations in VEC (of
1998 which there are LEN). Output debugging information for them. */
2001 check_global_declarations (vec
, len
)
2008 for (i
= 0; i
< len
; i
++)
2012 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2013 && ! TREE_ASM_WRITTEN (decl
))
2014 /* Cancel the RTL for this decl so that, if debugging info
2015 output for global variables is still to come,
2016 this one will be omitted. */
2017 SET_DECL_RTL (decl
, NULL_RTX
);
2019 /* Warn about any function
2020 declared static but not defined.
2021 We don't warn about variables,
2022 because many programs have static variables
2023 that exist only to get some text into the object file. */
2024 if (TREE_CODE (decl
) == FUNCTION_DECL
2025 && (warn_unused_function
2026 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2027 && DECL_INITIAL (decl
) == 0
2028 && DECL_EXTERNAL (decl
)
2029 && ! DECL_ARTIFICIAL (decl
)
2030 && ! TREE_PUBLIC (decl
))
2032 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2033 pedwarn_with_decl (decl
,
2034 "`%s' used but never defined");
2036 warning_with_decl (decl
,
2037 "`%s' declared `static' but never defined");
2038 /* This symbol is effectively an "extern" declaration now. */
2039 TREE_PUBLIC (decl
) = 1;
2040 assemble_external (decl
);
2043 /* Warn about static fns or vars defined but not used. */
2044 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
2045 || (warn_unused_variable
&& TREE_CODE (decl
) == VAR_DECL
))
2046 && ! TREE_USED (decl
)
2047 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2048 to handle multiple external decls in different scopes. */
2049 && ! TREE_USED (DECL_NAME (decl
))
2050 && ! DECL_EXTERNAL (decl
)
2051 && ! TREE_PUBLIC (decl
)
2052 /* Global register variables must be declared to reserve them. */
2053 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
2054 /* Otherwise, ask the language. */
2055 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
2056 warning_with_decl (decl
, "`%s' defined but not used");
2058 timevar_push (TV_SYMOUT
);
2059 (*debug_hooks
->global_decl
) (decl
);
2060 timevar_pop (TV_SYMOUT
);
2064 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2065 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2066 INPUT_FILENAME and LINENO accordingly. */
2069 push_srcloc (file
, line
)
2073 struct file_stack
*fs
;
2075 if (input_file_stack
)
2077 input_file_stack
->name
= input_filename
;
2078 input_file_stack
->line
= lineno
;
2081 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2082 fs
->name
= input_filename
= file
;
2083 fs
->line
= lineno
= line
;
2084 fs
->next
= input_file_stack
;
2085 input_file_stack
= fs
;
2086 input_file_stack_tick
++;
2089 /* Pop the top entry off the stack of presently open source files.
2090 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2096 struct file_stack
*fs
;
2098 fs
= input_file_stack
;
2099 input_file_stack
= fs
->next
;
2101 input_file_stack_tick
++;
2102 /* The initial source file is never popped. */
2103 if (!input_file_stack
)
2105 input_filename
= input_file_stack
->name
;
2106 lineno
= input_file_stack
->line
;
2109 /* Compile an entire translation unit. Write a file of assembly
2110 output and various debugging dumps. */
2117 /* Initialize yet another pass. */
2119 init_final (main_input_filename
);
2120 init_branch_prob (dump_base_name
);
2122 timevar_push (TV_PARSE
);
2124 /* Call the parser, which parses the entire file (calling
2125 rest_of_compilation for each function). */
2126 (*lang_hooks
.parse_file
) (set_yydebug
);
2128 /* In case there were missing block closers,
2129 get us back to the global binding level. */
2130 (*lang_hooks
.clear_binding_stack
) ();
2132 /* Compilation is now finished except for writing
2133 what's left of the symbol table output. */
2134 timevar_pop (TV_PARSE
);
2136 if (flag_syntax_only
)
2139 globals
= (*lang_hooks
.decls
.getdecls
) ();
2141 /* Really define vars that have had only a tentative definition.
2142 Really output inline functions that must actually be callable
2143 and have not been output so far. */
2146 int len
= list_length (globals
);
2147 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2151 /* Process the decls in reverse order--earliest first.
2152 Put them into VEC from back to front, then take out from front. */
2154 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2155 vec
[len
- i
- 1] = decl
;
2157 wrapup_global_declarations (vec
, len
);
2159 /* This must occur after the loop to output deferred functions. Else
2160 the profiler initializer would not be emitted if all the functions
2161 in this compilation unit were deferred.
2163 output_func_start_profiler can not cause any additional functions or
2164 data to need to be output, so it need not be in the deferred function
2166 output_func_start_profiler ();
2168 check_global_declarations (vec
, len
);
2174 /* Write out any pending weak symbol declarations. */
2178 /* Do dbx symbols. */
2179 timevar_push (TV_SYMOUT
);
2181 #ifdef DWARF2_UNWIND_INFO
2182 if (dwarf2out_do_frame ())
2183 dwarf2out_frame_finish ();
2186 (*debug_hooks
->finish
) (main_input_filename
);
2187 timevar_pop (TV_SYMOUT
);
2189 /* Output some stuff at end of file if nec. */
2191 dw2_output_indirect_constants ();
2193 end_final (dump_base_name
);
2195 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2197 timevar_push (TV_DUMP
);
2198 open_dump_file (DFI_bp
, NULL
);
2202 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2203 timevar_pop (TV_DUMP
);
2207 ASM_FILE_END (asm_out_file
);
2210 /* Attach a special .ident directive to the end of the file to identify
2211 the version of GCC which compiled this code. The format of the .ident
2212 string is patterned after the ones produced by native SVR4 compilers. */
2215 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2216 IDENT_ASM_OP
, version_string
);
2219 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2221 timevar_push (TV_DUMP
);
2222 dump_combine_total_stats (rtl_dump_file
);
2223 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2224 timevar_pop (TV_DUMP
);
2228 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2229 and TYPE_DECL nodes.
2231 This does nothing for local (non-static) variables, unless the
2232 variable is a register variable with an ASMSPEC. In that case, or
2233 if the variable is not an automatic, it sets up the RTL and
2234 outputs any assembler code (label definition, storage allocation
2235 and initialization).
2237 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2238 the assembler symbol name to be used. TOP_LEVEL is nonzero
2239 if this declaration is not within a function. */
2242 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2244 const char *asmspec
;
2248 /* Declarations of variables, and of functions defined elsewhere. */
2250 /* The most obvious approach, to put an #ifndef around where
2251 this macro is used, doesn't work since it's inside a macro call. */
2252 #ifndef ASM_FINISH_DECLARE_OBJECT
2253 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2256 /* We deferred calling assemble_alias so that we could collect
2257 other attributes such as visibility. Emit the alias now. */
2260 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2263 alias
= TREE_VALUE (TREE_VALUE (alias
));
2264 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2265 assemble_alias (decl
, alias
);
2269 /* Forward declarations for nested functions are not "external",
2270 but we need to treat them as if they were. */
2271 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2272 || TREE_CODE (decl
) == FUNCTION_DECL
)
2274 timevar_push (TV_VARCONST
);
2277 make_decl_rtl (decl
, asmspec
);
2279 /* Don't output anything when a tentative file-scope definition
2280 is seen. But at end of compilation, do output code for them. */
2281 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2282 assemble_variable (decl
, top_level
, at_end
, 0);
2283 if (decl
== last_assemble_variable_decl
)
2285 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2289 timevar_pop (TV_VARCONST
);
2291 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2293 if (decode_reg_name (asmspec
) >= 0)
2295 SET_DECL_RTL (decl
, NULL_RTX
);
2296 make_decl_rtl (decl
, asmspec
);
2300 error ("invalid register name `%s' for register variable", asmspec
);
2301 DECL_REGISTER (decl
) = 0;
2306 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2307 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2308 && TREE_CODE (decl
) == TYPE_DECL
)
2310 timevar_push (TV_SYMOUT
);
2311 dbxout_symbol (decl
, 0);
2312 timevar_pop (TV_SYMOUT
);
2315 #ifdef SDB_DEBUGGING_INFO
2316 else if (write_symbols
== SDB_DEBUG
&& top_level
2317 && TREE_CODE (decl
) == TYPE_DECL
)
2319 timevar_push (TV_SYMOUT
);
2320 sdbout_symbol (decl
, 0);
2321 timevar_pop (TV_SYMOUT
);
2326 /* Called after finishing a record, union or enumeral type. */
2329 rest_of_type_compilation (type
, toplev
)
2330 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2334 tree type ATTRIBUTE_UNUSED
;
2335 int toplev ATTRIBUTE_UNUSED
;
2338 timevar_push (TV_SYMOUT
);
2339 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2340 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2341 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2343 #ifdef SDB_DEBUGGING_INFO
2344 if (write_symbols
== SDB_DEBUG
)
2345 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2347 #ifdef DWARF2_DEBUGGING_INFO
2348 if ((write_symbols
== DWARF2_DEBUG
2349 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2351 dwarf2out_decl (TYPE_STUB_DECL (type
));
2353 timevar_pop (TV_SYMOUT
);
2356 /* This is called from finish_function (within langhooks.parse_file)
2357 after each top-level definition is parsed.
2358 It is supposed to compile that function or variable
2359 and output the assembler code for it.
2360 After we return, the tree storage is freed. */
2363 rest_of_compilation (decl
)
2369 int rebuild_label_notes_after_reload
;
2370 int register_life_up_to_date
;
2372 timevar_push (TV_REST_OF_COMPILATION
);
2374 /* Now that we're out of the frontend, we shouldn't have any more
2375 CONCATs anywhere. */
2376 generating_concat_p
= 0;
2378 /* When processing delayed functions, prepare_function_start() won't
2379 have been run to re-initialize it. */
2380 cse_not_expected
= ! optimize
;
2382 /* First, make sure that NOTE_BLOCK is set correctly for each
2383 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2384 if (!cfun
->x_whole_function_mode_p
)
2387 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2388 tree in sensible shape. So, we just recalculate it here. */
2389 if (cfun
->x_whole_function_mode_p
)
2394 /* If we are reconsidering an inline function
2395 at the end of compilation, skip the stuff for making it inline. */
2397 if (DECL_SAVED_INSNS (decl
) == 0)
2403 /* If this is nested inside an inlined external function, pretend
2404 it was only declared. Since we cannot inline such functions,
2405 generating code for this one is not only not necessary but will
2406 confuse some debugging output writers. */
2407 for (parent
= DECL_CONTEXT (current_function_decl
);
2408 parent
!= NULL_TREE
;
2409 parent
= get_containing_scope (parent
))
2410 if (TREE_CODE (parent
) == FUNCTION_DECL
2411 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2413 DECL_INITIAL (decl
) = 0;
2414 goto exit_rest_of_compilation
;
2417 /* If requested, consider whether to make this function inline. */
2418 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2419 || flag_inline_functions
)
2421 timevar_push (TV_INTEGRATION
);
2422 lose
= function_cannot_inline_p (decl
);
2423 timevar_pop (TV_INTEGRATION
);
2424 if (lose
|| ! optimize
)
2426 if (warn_inline
&& DECL_INLINE (decl
))
2427 warning_with_decl (decl
, lose
);
2428 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2429 /* Don't really compile an extern inline function.
2430 If we can't make it inline, pretend
2431 it was only declared. */
2432 if (DECL_EXTERNAL (decl
))
2434 DECL_INITIAL (decl
) = 0;
2435 goto exit_rest_of_compilation
;
2439 /* ??? Note that this has the effect of making it look
2440 like "inline" was specified for a function if we choose
2441 to inline it. This isn't quite right, but it's
2442 probably not worth the trouble to fix. */
2443 inlinable
= DECL_INLINE (decl
) = 1;
2446 insns
= get_insns ();
2448 /* Dump the rtl code if we are dumping rtl. */
2450 if (open_dump_file (DFI_rtl
, decl
))
2452 if (DECL_SAVED_INSNS (decl
))
2453 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2454 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2457 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2458 sorts of eh initialization. Delay this until after the
2459 initial rtl dump so that we can see the original nesting. */
2460 convert_from_eh_region_ranges ();
2462 /* If function is inline, and we don't yet know whether to
2463 compile it by itself, defer decision till end of compilation.
2464 finish_compilation will call rest_of_compilation again
2465 for those functions that need to be output. Also defer those
2466 functions that we are supposed to defer. */
2469 || (DECL_INLINE (decl
)
2470 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2471 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2472 && ! flag_keep_inline_functions
)
2473 || DECL_EXTERNAL (decl
))))
2474 DECL_DEFER_OUTPUT (decl
) = 1;
2476 if (DECL_INLINE (decl
))
2477 /* DWARF wants separate debugging info for abstract and
2478 concrete instances of all inline functions, including those
2479 declared inline but not inlined, and those inlined even
2480 though they weren't declared inline. Conveniently, that's
2481 what DECL_INLINE means at this point. */
2482 (*debug_hooks
->deferred_inline_function
) (decl
);
2484 if (DECL_DEFER_OUTPUT (decl
))
2486 /* If -Wreturn-type, we have to do a bit of compilation. We just
2487 want to call cleanup the cfg to figure out whether or not we can
2488 fall off the end of the function; we do the minimum amount of
2489 work necessary to make that safe. */
2490 if (warn_return_type
)
2492 int saved_optimize
= optimize
;
2495 rebuild_jump_labels (insns
);
2496 find_exception_handler_labels ();
2497 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2498 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2499 optimize
= saved_optimize
;
2501 /* CFG is no longer maintained up-to-date. */
2502 free_bb_for_insn ();
2505 current_function_nothrow
= nothrow_function_p ();
2506 if (current_function_nothrow
)
2507 /* Now we know that this can't throw; set the flag for the benefit
2508 of other functions later in this translation unit. */
2509 TREE_NOTHROW (current_function_decl
) = 1;
2511 timevar_push (TV_INTEGRATION
);
2512 save_for_inline (decl
);
2513 timevar_pop (TV_INTEGRATION
);
2514 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2515 goto exit_rest_of_compilation
;
2518 /* If specified extern inline but we aren't inlining it, we are
2519 done. This goes for anything that gets here with DECL_EXTERNAL
2520 set, not just things with DECL_INLINE. */
2521 if (DECL_EXTERNAL (decl
))
2522 goto exit_rest_of_compilation
;
2525 /* If we're emitting a nested function, make sure its parent gets
2526 emitted as well. Doing otherwise confuses debug info. */
2529 for (parent
= DECL_CONTEXT (current_function_decl
);
2530 parent
!= NULL_TREE
;
2531 parent
= get_containing_scope (parent
))
2532 if (TREE_CODE (parent
) == FUNCTION_DECL
)
2533 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
2536 /* We are now committed to emitting code for this function. Do any
2537 preparation, such as emitting abstract debug info for the inline
2538 before it gets mangled by optimization. */
2539 if (DECL_INLINE (decl
))
2540 (*debug_hooks
->outlining_inline_function
) (decl
);
2542 /* Remove any notes we don't need. That will make iterating
2543 over the instruction sequence faster, and allow the garbage
2544 collector to reclaim the memory used by the notes. */
2545 remove_unnecessary_notes ();
2550 /* Initialize some variables used by the optimizers. */
2551 init_function_for_compilation ();
2553 if (! DECL_DEFER_OUTPUT (decl
))
2554 TREE_ASM_WRITTEN (decl
) = 1;
2556 /* Now that integrate will no longer see our rtl, we need not
2557 distinguish between the return value of this function and the
2558 return value of called functions. Also, we can remove all SETs
2559 of subregs of hard registers; they are only here because of
2560 integrate. Also, we can now initialize pseudos intended to
2561 carry magic hard reg data throughout the function. */
2562 rtx_equal_function_value_matters
= 0;
2563 purge_hard_subreg_sets (get_insns ());
2565 /* Early return if there were errors. We can run afoul of our
2566 consistency checks, and there's not really much point in fixing them.
2567 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2568 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2569 || errorcount
|| sorrycount
)
2570 goto exit_rest_of_compilation
;
2572 timevar_push (TV_JUMP
);
2573 open_dump_file (DFI_sibling
, decl
);
2574 insns
= get_insns ();
2575 rebuild_jump_labels (insns
);
2576 find_exception_handler_labels ();
2577 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2579 delete_unreachable_blocks ();
2581 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2582 note_prediction_to_br_prob ();
2584 /* We may have potential sibling or tail recursion sites. Select one
2585 (of possibly multiple) methods of performing the call. */
2586 if (flag_optimize_sibling_calls
)
2589 optimize_sibling_and_tail_recursive_calls ();
2591 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2592 free_bb_for_insn ();
2593 find_exception_handler_labels ();
2594 rebuild_jump_labels (insns
);
2595 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2597 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2598 notes before simplifying cfg and we must do lowering after sibcall
2599 that unhides parts of RTL chain and cleans up the CFG.
2601 Until sibcall is replaced by tree-level optimizer, lets just
2602 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2603 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2604 if (GET_CODE (insn
) == NOTE
2605 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2608 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2609 timevar_pop (TV_JUMP
);
2611 scope_to_insns_initialize ();
2612 /* Complete generation of exception handling code. */
2615 timevar_push (TV_JUMP
);
2616 open_dump_file (DFI_eh
, decl
);
2618 finish_eh_generation ();
2620 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2621 timevar_pop (TV_JUMP
);
2624 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2625 generation, which might create new sets. */
2626 emit_initial_value_sets ();
2629 /* If we are doing position-independent code generation, now
2630 is the time to output special prologues and epilogues.
2631 We do not want to do this earlier, because it just clutters
2632 up inline functions with meaningless insns. */
2637 insns
= get_insns ();
2639 /* Copy any shared structure that should not be shared. */
2640 unshare_all_rtl (current_function_decl
, insns
);
2642 #ifdef SETJMP_VIA_SAVE_AREA
2643 /* This must be performed before virtual register instantiation.
2644 Please be aware the everything in the compiler that can look
2645 at the RTL up to this point must understand that REG_SAVE_AREA
2646 is just like a use of the REG contained inside. */
2647 if (current_function_calls_alloca
)
2648 optimize_save_area_alloca (insns
);
2651 /* Instantiate all virtual registers. */
2652 instantiate_virtual_regs (current_function_decl
, insns
);
2654 open_dump_file (DFI_jump
, decl
);
2656 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2657 are initialized and to compute whether control can drop off the end
2660 timevar_push (TV_JUMP
);
2661 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2662 before jump optimization switches branch directions. */
2663 expected_value_to_br_prob ();
2665 reg_scan (insns
, max_reg_num (), 0);
2666 rebuild_jump_labels (insns
);
2667 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2669 dump_flow_info (rtl_dump_file
);
2670 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
2671 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2673 /* CFG is no longer maintained up-to-date. */
2674 free_bb_for_insn ();
2675 copy_loop_headers (insns
);
2676 purge_line_number_notes (insns
);
2677 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2679 timevar_pop (TV_JUMP
);
2680 close_dump_file (DFI_jump
, print_rtl
, insns
);
2682 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2683 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2685 goto exit_rest_of_compilation
;
2688 /* Long term, this should probably move before the jump optimizer too,
2689 but I didn't want to disturb the rtl_dump_and_exit and related
2690 stuff at this time. */
2691 if (optimize
> 0 && flag_ssa
)
2693 /* Convert to SSA form. */
2695 timevar_push (TV_TO_SSA
);
2696 open_dump_file (DFI_ssa
, decl
);
2698 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2701 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2702 timevar_pop (TV_TO_SSA
);
2704 /* Perform sparse conditional constant propagation, if requested. */
2707 timevar_push (TV_SSA_CCP
);
2708 open_dump_file (DFI_ssa_ccp
, decl
);
2712 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2713 timevar_pop (TV_SSA_CCP
);
2716 /* It would be useful to cleanup the CFG at this point, but block
2717 merging and possibly other transformations might leave a PHI
2718 node in the middle of a basic block, which is a strict no-no. */
2720 /* The SSA implementation uses basic block numbers in its phi
2721 nodes. Thus, changing the control-flow graph or the basic
2722 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2723 may cause problems. */
2727 /* Remove dead code. */
2729 timevar_push (TV_SSA_DCE
);
2730 open_dump_file (DFI_ssa_dce
, decl
);
2732 insns
= get_insns ();
2733 ssa_eliminate_dead_code ();
2735 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2736 timevar_pop (TV_SSA_DCE
);
2739 /* Convert from SSA form. */
2741 timevar_push (TV_FROM_SSA
);
2742 open_dump_file (DFI_ussa
, decl
);
2744 convert_from_ssa ();
2745 /* New registers have been created. Rescan their usage. */
2746 reg_scan (insns
, max_reg_num (), 1);
2748 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2749 timevar_pop (TV_FROM_SSA
);
2754 timevar_push (TV_JUMP
);
2755 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
: 0);
2757 /* Try to identify useless null pointer tests and delete them. */
2758 if (flag_delete_null_pointer_checks
)
2760 open_dump_file (DFI_null
, decl
);
2762 dump_flow_info (rtl_dump_file
);
2764 if (delete_null_pointer_checks (insns
))
2765 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2767 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2770 /* Jump optimization, and the removal of NULL pointer checks, may
2771 have reduced the number of instructions substantially. CSE, and
2772 future passes, allocate arrays whose dimensions involve the
2773 maximum instruction UID, so if we can reduce the maximum UID
2774 we'll save big on memory. */
2775 renumber_insns (rtl_dump_file
);
2776 timevar_pop (TV_JUMP
);
2778 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
2782 /* Perform common subexpression elimination.
2783 Nonzero value from `cse_main' means that jumps were simplified
2784 and some code may now be unreachable, so do
2785 jump optimization again. */
2789 open_dump_file (DFI_cse
, decl
);
2791 dump_flow_info (rtl_dump_file
);
2792 timevar_push (TV_CSE
);
2794 reg_scan (insns
, max_reg_num (), 1);
2796 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2798 rebuild_jump_labels (insns
);
2799 purge_all_dead_edges (0);
2801 delete_trivially_dead_insns (insns
, max_reg_num ());
2803 /* If we are not running more CSE passes, then we are no longer
2804 expecting CSE to be run. But always rerun it in a cheap mode. */
2805 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2807 if (tem
|| optimize
> 1)
2808 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2809 /* Try to identify useless null pointer tests and delete them. */
2810 if (flag_delete_null_pointer_checks
)
2812 timevar_push (TV_JUMP
);
2814 if (delete_null_pointer_checks (insns
))
2815 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2816 timevar_pop (TV_JUMP
);
2819 /* The second pass of jump optimization is likely to have
2820 removed a bunch more instructions. */
2821 renumber_insns (rtl_dump_file
);
2823 timevar_pop (TV_CSE
);
2824 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2827 open_dump_file (DFI_addressof
, decl
);
2829 purge_addressof (insns
);
2831 purge_all_dead_edges (0);
2832 reg_scan (insns
, max_reg_num (), 1);
2834 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2838 /* Perform global cse. */
2840 if (optimize
> 0 && flag_gcse
)
2842 int save_csb
, save_cfj
;
2845 timevar_push (TV_GCSE
);
2846 open_dump_file (DFI_gcse
, decl
);
2848 tem
= gcse_main (insns
, rtl_dump_file
);
2849 rebuild_jump_labels (insns
);
2850 delete_trivially_dead_insns (insns
, max_reg_num ());
2852 save_csb
= flag_cse_skip_blocks
;
2853 save_cfj
= flag_cse_follow_jumps
;
2854 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2856 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2858 if (flag_expensive_optimizations
)
2860 timevar_push (TV_CSE
);
2861 reg_scan (insns
, max_reg_num (), 1);
2862 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2863 purge_all_dead_edges (0);
2864 delete_trivially_dead_insns (insns
, max_reg_num ());
2865 timevar_pop (TV_CSE
);
2866 cse_not_expected
= !flag_rerun_cse_after_loop
;
2869 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2870 things up. Then possibly re-run CSE again. */
2874 timevar_push (TV_JUMP
);
2875 rebuild_jump_labels (insns
);
2876 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2877 timevar_pop (TV_JUMP
);
2879 if (flag_expensive_optimizations
)
2881 timevar_push (TV_CSE
);
2882 reg_scan (insns
, max_reg_num (), 1);
2883 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2884 purge_all_dead_edges (0);
2885 delete_trivially_dead_insns (insns
, max_reg_num ());
2886 timevar_pop (TV_CSE
);
2890 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2891 timevar_pop (TV_GCSE
);
2894 flag_cse_skip_blocks
= save_csb
;
2895 flag_cse_follow_jumps
= save_cfj
;
2896 #ifdef ENABLE_CHECKING
2897 verify_flow_info ();
2901 /* Move constant computations out of loops. */
2903 if (optimize
> 0 && flag_loop_optimize
)
2905 int do_unroll
, do_prefetch
;
2907 timevar_push (TV_LOOP
);
2908 delete_dead_jumptables ();
2909 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2910 open_dump_file (DFI_loop
, decl
);
2911 /* CFG is no longer maintained up-to-date. */
2912 free_bb_for_insn ();
2914 do_unroll
= flag_unroll_loops
? LOOP_UNROLL
: LOOP_AUTO_UNROLL
;
2915 do_prefetch
= flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0;
2916 if (flag_rerun_loop_opt
)
2918 cleanup_barriers ();
2920 /* We only want to perform unrolling once. */
2921 loop_optimize (insns
, rtl_dump_file
, do_unroll
);
2924 /* The first call to loop_optimize makes some instructions
2925 trivially dead. We delete those instructions now in the
2926 hope that doing so will make the heuristics in loop work
2927 better and possibly speed up compilation. */
2928 delete_trivially_dead_insns (insns
, max_reg_num ());
2930 /* The regscan pass is currently necessary as the alias
2931 analysis code depends on this information. */
2932 reg_scan (insns
, max_reg_num (), 1);
2934 cleanup_barriers ();
2935 loop_optimize (insns
, rtl_dump_file
, do_unroll
| LOOP_BCT
| do_prefetch
);
2937 /* Loop can create trivially dead instructions. */
2938 delete_trivially_dead_insns (insns
, max_reg_num ());
2939 close_dump_file (DFI_loop
, print_rtl
, insns
);
2940 timevar_pop (TV_LOOP
);
2941 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2946 /* Do control and data flow analysis; wrote some of the results to
2949 timevar_push (TV_FLOW
);
2950 open_dump_file (DFI_cfg
, decl
);
2952 dump_flow_info (rtl_dump_file
);
2953 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0)
2954 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2956 /* It may make more sense to mark constant functions after dead code is
2957 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2958 may insert code making function non-constant, but we still must consider
2959 it as constant, otherwise -fbranch-probabilities will not read data back.
2961 life_analyzis rarely eliminates modification of external memory.
2964 mark_constant_function ();
2966 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2968 /* Do branch profiling and static profile estimation passes. */
2969 if (optimize
> 0 || cfun
->arc_profile
|| flag_branch_probabilities
)
2973 timevar_push (TV_BRANCH_PROB
);
2974 open_dump_file (DFI_bp
, decl
);
2975 if (cfun
->arc_profile
|| flag_branch_probabilities
)
2978 /* Discover and record the loop depth at the head of each basic
2979 block. The loop infrastructure does the real job for us. */
2980 flow_loops_find (&loops
, LOOP_TREE
);
2983 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2985 /* Estimate using heuristics if no profiling info is available. */
2986 if (flag_guess_branch_prob
)
2987 estimate_probability (&loops
);
2989 flow_loops_free (&loops
);
2990 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2991 timevar_pop (TV_BRANCH_PROB
);
2995 timevar_push (TV_TRACER
);
2996 open_dump_file (DFI_tracer
, decl
);
2998 dump_flow_info (rtl_dump_file
);
2999 cleanup_cfg (CLEANUP_EXPENSIVE
);
3001 cleanup_cfg (CLEANUP_EXPENSIVE
);
3002 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
3003 timevar_pop (TV_TRACER
);
3004 reg_scan (get_insns (), max_reg_num (), 0);
3009 timevar_push (TV_CSE2
);
3010 open_dump_file (DFI_cse2
, decl
);
3012 dump_flow_info (rtl_dump_file
);
3014 if (flag_rerun_cse_after_loop
)
3016 timevar_push (TV_JUMP
);
3018 reg_scan (insns
, max_reg_num (), 0);
3020 timevar_push (TV_IFCVT
);
3021 cleanup_cfg (CLEANUP_EXPENSIVE
);
3022 if (flag_if_conversion
)
3024 timevar_pop (TV_IFCVT
);
3026 timevar_pop (TV_JUMP
);
3027 /* CFG is no longer maintained up-to-date. */
3028 reg_scan (insns
, max_reg_num (), 0);
3029 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3030 purge_all_dead_edges (0);
3031 delete_trivially_dead_insns (insns
, max_reg_num ());
3035 timevar_push (TV_JUMP
);
3036 rebuild_jump_labels (insns
);
3037 cleanup_cfg (CLEANUP_EXPENSIVE
);
3038 timevar_pop (TV_JUMP
);
3042 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
3043 timevar_pop (TV_CSE2
);
3048 cse_not_expected
= 1;
3050 open_dump_file (DFI_life
, decl
);
3053 check_function_return_warnings ();
3055 #ifdef ENABLE_CHECKING
3056 verify_flow_info ();
3058 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3060 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
3061 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3062 timevar_pop (TV_FLOW
);
3066 if (warn_uninitialized
|| extra_warnings
)
3068 uninitialized_vars_warning (DECL_INITIAL (decl
));
3070 setjmp_args_warning ();
3076 if (!flag_new_regalloc
&& initialize_uninitialized_subregs ())
3078 /* Insns were inserted, so things might look a bit different. */
3079 insns
= get_insns ();
3080 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES
,
3081 PROP_LOG_LINKS
| PROP_REG_INFO
3082 | PROP_DEATH_NOTES
);
3086 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3090 /* If -opt, try combining insns through substitution. */
3094 int rebuild_jump_labels_after_combine
= 0;
3096 timevar_push (TV_COMBINE
);
3097 open_dump_file (DFI_combine
, decl
);
3099 rebuild_jump_labels_after_combine
3100 = combine_instructions (insns
, max_reg_num ());
3102 /* Combining insns may have turned an indirect jump into a
3103 direct jump. Rebuid the JUMP_LABEL fields of jumping
3105 if (rebuild_jump_labels_after_combine
)
3107 timevar_push (TV_JUMP
);
3108 rebuild_jump_labels (insns
);
3109 timevar_pop (TV_JUMP
);
3111 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3114 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3115 timevar_pop (TV_COMBINE
);
3120 /* Rerun if-conversion, as combine may have simplified things enough to
3121 now meet sequence length restrictions. */
3122 if (flag_if_conversion
)
3124 timevar_push (TV_IFCVT
);
3125 open_dump_file (DFI_ce
, decl
);
3131 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3132 timevar_pop (TV_IFCVT
);
3135 /* Register allocation pre-pass, to reduce number of moves
3136 necessary for two-address machines. */
3137 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3139 timevar_push (TV_REGMOVE
);
3140 open_dump_file (DFI_regmove
, decl
);
3142 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3144 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3145 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3146 timevar_pop (TV_REGMOVE
);
3151 /* Do unconditional splitting before register allocation to allow machine
3152 description to add extra information not needed previously. */
3153 split_all_insns (1);
3155 /* Any of the several passes since flow1 will have munged register
3156 lifetime data a bit. */
3157 register_life_up_to_date
= 0;
3159 #ifdef OPTIMIZE_MODE_SWITCHING
3160 timevar_push (TV_MODE_SWITCH
);
3163 optimize_mode_switching (NULL
);
3166 timevar_pop (TV_MODE_SWITCH
);
3169 timevar_push (TV_SCHED
);
3171 #ifdef INSN_SCHEDULING
3173 /* Print function header into sched dump now
3174 because doing the sched analysis makes some of the dump. */
3175 if (optimize
> 0 && flag_schedule_insns
)
3177 open_dump_file (DFI_sched
, decl
);
3179 /* Do control and data sched analysis,
3180 and write some of the results to dump file. */
3182 schedule_insns (rtl_dump_file
);
3184 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3186 /* Register lifetime information was updated as part of verifying
3188 register_life_up_to_date
= 1;
3191 timevar_pop (TV_SCHED
);
3195 /* Determine if the current function is a leaf before running reload
3196 since this can impact optimizations done by the prologue and
3197 epilogue thus changing register elimination offsets. */
3198 current_function_is_leaf
= leaf_function_p ();
3200 timevar_push (TV_LOCAL_ALLOC
);
3201 open_dump_file (DFI_lreg
, decl
);
3203 /* Allocate pseudo-regs that are used only within 1 basic block.
3205 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3206 jump optimizer after register allocation and reloading are finished. */
3208 if (! register_life_up_to_date
)
3209 recompute_reg_usage (insns
, ! optimize_size
);
3211 if (flag_new_regalloc
)
3213 delete_trivially_dead_insns (insns
, max_reg_num ());
3216 timevar_pop (TV_LOCAL_ALLOC
);
3217 if (dump_file
[DFI_lreg
].enabled
)
3219 timevar_push (TV_DUMP
);
3221 close_dump_file (DFI_lreg
, NULL
, NULL
);
3222 timevar_pop (TV_DUMP
);
3225 /* XXX clean up the whole mess to bring live info in shape again. */
3226 timevar_push (TV_GLOBAL_ALLOC
);
3227 open_dump_file (DFI_greg
, decl
);
3229 build_insn_chain (insns
);
3230 failure
= reload (insns
, 0);
3232 timevar_pop (TV_GLOBAL_ALLOC
);
3234 if (dump_file
[DFI_greg
].enabled
)
3236 timevar_push (TV_DUMP
);
3238 dump_global_regs (rtl_dump_file
);
3240 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3241 timevar_pop (TV_DUMP
);
3245 goto exit_rest_of_compilation
;
3246 reload_completed
= 1;
3247 rebuild_label_notes_after_reload
= 0;
3251 /* Allocate the reg_renumber array. */
3252 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3254 /* And the reg_equiv_memory_loc array. */
3255 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3257 allocate_initial_values (reg_equiv_memory_loc
);
3259 regclass (insns
, max_reg_num (), rtl_dump_file
);
3260 rebuild_label_notes_after_reload
= local_alloc ();
3262 timevar_pop (TV_LOCAL_ALLOC
);
3264 if (dump_file
[DFI_lreg
].enabled
)
3266 timevar_push (TV_DUMP
);
3268 dump_flow_info (rtl_dump_file
);
3269 dump_local_alloc (rtl_dump_file
);
3271 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3272 timevar_pop (TV_DUMP
);
3277 timevar_push (TV_GLOBAL_ALLOC
);
3278 open_dump_file (DFI_greg
, decl
);
3280 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3281 pass fixing up any insns that are invalid. */
3284 failure
= global_alloc (rtl_dump_file
);
3287 build_insn_chain (insns
);
3288 failure
= reload (insns
, 0);
3291 timevar_pop (TV_GLOBAL_ALLOC
);
3293 if (dump_file
[DFI_greg
].enabled
)
3295 timevar_push (TV_DUMP
);
3297 dump_global_regs (rtl_dump_file
);
3299 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3300 timevar_pop (TV_DUMP
);
3304 goto exit_rest_of_compilation
;
3309 open_dump_file (DFI_postreload
, decl
);
3311 /* Do a very simple CSE pass over just the hard registers. */
3314 timevar_push (TV_RELOAD_CSE_REGS
);
3315 reload_cse_regs (insns
);
3316 timevar_pop (TV_RELOAD_CSE_REGS
);
3319 /* Register allocation and reloading may have turned an indirect jump into
3320 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3321 jumping instructions. */
3322 if (rebuild_label_notes_after_reload
)
3324 timevar_push (TV_JUMP
);
3326 rebuild_jump_labels (insns
);
3327 purge_all_dead_edges (0);
3329 timevar_pop (TV_JUMP
);
3332 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3334 /* Re-create the death notes which were deleted during reload. */
3335 timevar_push (TV_FLOW2
);
3336 open_dump_file (DFI_flow2
, decl
);
3338 #ifdef ENABLE_CHECKING
3339 verify_flow_info ();
3342 /* If optimizing, then go ahead and split insns now. */
3344 split_all_insns (0);
3346 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3348 /* On some machines, the prologue and epilogue code, or parts thereof,
3349 can be represented as RTL. Doing so lets us schedule insns between
3350 it and the rest of the code and also allows delayed branch
3351 scheduling to operate in the epilogue. */
3352 thread_prologue_and_epilogue_insns (insns
);
3356 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3357 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3358 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3360 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3361 even for machines with possibly nonzero RETURN_POPS_ARGS
3362 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3363 push instructions will have popping returns. */
3364 #ifndef PUSH_ROUNDING
3365 if (!ACCUMULATE_OUTGOING_ARGS
)
3367 combine_stack_adjustments ();
3372 flow2_completed
= 1;
3374 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3375 timevar_pop (TV_FLOW2
);
3377 #ifdef HAVE_peephole2
3378 if (optimize
> 0 && flag_peephole2
)
3380 timevar_push (TV_PEEPHOLE2
);
3381 open_dump_file (DFI_peephole2
, decl
);
3383 peephole2_optimize (rtl_dump_file
);
3385 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3386 timevar_pop (TV_PEEPHOLE2
);
3390 if (optimize
> 0 && (flag_rename_registers
|| flag_cprop_registers
))
3392 timevar_push (TV_RENAME_REGISTERS
);
3393 open_dump_file (DFI_rnreg
, decl
);
3395 if (flag_rename_registers
)
3396 regrename_optimize ();
3397 if (flag_cprop_registers
)
3398 copyprop_hardreg_forward ();
3400 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3401 timevar_pop (TV_RENAME_REGISTERS
);
3404 if (flag_if_conversion2
)
3406 timevar_push (TV_IFCVT2
);
3407 open_dump_file (DFI_ce2
, decl
);
3411 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3412 timevar_pop (TV_IFCVT2
);
3416 split_all_insns (1);
3419 #ifdef INSN_SCHEDULING
3420 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3422 timevar_push (TV_SCHED2
);
3423 open_dump_file (DFI_sched2
, decl
);
3425 /* Do control and data sched analysis again,
3426 and write some more of the results to dump file. */
3428 split_all_insns (1);
3430 schedule_insns (rtl_dump_file
);
3432 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3433 timevar_pop (TV_SCHED2
);
3439 #ifdef LEAF_REGISTERS
3440 current_function_uses_only_leaf_regs
3441 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3445 timevar_push (TV_REG_STACK
);
3446 open_dump_file (DFI_stack
, decl
);
3448 reg_to_stack (insns
, rtl_dump_file
);
3450 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3451 timevar_pop (TV_REG_STACK
);
3457 timevar_push (TV_REORDER_BLOCKS
);
3458 open_dump_file (DFI_bbro
, decl
);
3460 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3461 splitting possibly introduced more crossjumping oppurtuntities.
3462 Except that we can't actually run crossjumping without running
3463 another DCE pass, which we can't do after reg-stack. */
3464 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3465 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3466 if (flag_reorder_blocks
)
3468 reorder_basic_blocks ();
3469 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3472 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3473 timevar_pop (TV_REORDER_BLOCKS
);
3475 compute_alignments ();
3477 /* CFG is no longer maintained up-to-date. */
3478 free_bb_for_insn ();
3480 /* If a machine dependent reorganization is needed, call it. */
3481 #ifdef MACHINE_DEPENDENT_REORG
3482 timevar_push (TV_MACH_DEP
);
3483 open_dump_file (DFI_mach
, decl
);
3485 MACHINE_DEPENDENT_REORG (insns
);
3487 close_dump_file (DFI_mach
, print_rtl
, insns
);
3488 timevar_pop (TV_MACH_DEP
);
3493 purge_line_number_notes (insns
);
3494 cleanup_barriers ();
3496 /* If a scheduling pass for delayed branches is to be done,
3497 call the scheduling code. */
3500 if (optimize
> 0 && flag_delayed_branch
)
3502 timevar_push (TV_DBR_SCHED
);
3503 open_dump_file (DFI_dbr
, decl
);
3505 dbr_schedule (insns
, rtl_dump_file
);
3507 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3508 timevar_pop (TV_DBR_SCHED
);
3514 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3515 timevar_push (TV_SHORTEN_BRANCH
);
3516 split_all_insns_noflow ();
3517 timevar_pop (TV_SHORTEN_BRANCH
);
3520 convert_to_eh_region_ranges ();
3522 /* Shorten branches. */
3523 timevar_push (TV_SHORTEN_BRANCH
);
3524 shorten_branches (get_insns ());
3525 timevar_pop (TV_SHORTEN_BRANCH
);
3527 current_function_nothrow
= nothrow_function_p ();
3528 if (current_function_nothrow
)
3529 /* Now we know that this can't throw; set the flag for the benefit
3530 of other functions later in this translation unit. */
3531 TREE_NOTHROW (current_function_decl
) = 1;
3533 /* Now turn the rtl into assembler code. */
3535 timevar_push (TV_FINAL
);
3540 /* Get the function's name, as described by its RTL. This may be
3541 different from the DECL_NAME name used in the source file. */
3543 x
= DECL_RTL (decl
);
3544 if (GET_CODE (x
) != MEM
)
3547 if (GET_CODE (x
) != SYMBOL_REF
)
3549 fnname
= XSTR (x
, 0);
3551 assemble_start_function (decl
, fnname
);
3552 final_start_function (insns
, asm_out_file
, optimize
);
3553 final (insns
, asm_out_file
, optimize
, 0);
3554 final_end_function ();
3556 #ifdef IA64_UNWIND_INFO
3557 /* ??? The IA-64 ".handlerdata" directive must be issued before
3558 the ".endp" directive that closes the procedure descriptor. */
3559 output_function_exception_table ();
3562 assemble_end_function (decl
, fnname
);
3564 #ifndef IA64_UNWIND_INFO
3565 /* Otherwise, it feels unclean to switch sections in the middle. */
3566 output_function_exception_table ();
3570 fflush (asm_out_file
);
3572 /* Release all memory allocated by flow. */
3573 free_basic_block_vars (0);
3575 /* Release all memory held by regsets now. */
3576 regset_release_memory ();
3578 timevar_pop (TV_FINAL
);
3582 /* Write DBX symbols if requested. */
3584 /* Note that for those inline functions where we don't initially
3585 know for certain that we will be generating an out-of-line copy,
3586 the first invocation of this routine (rest_of_compilation) will
3587 skip over this code by doing a `goto exit_rest_of_compilation;'.
3588 Later on, finish_compilation will call rest_of_compilation again
3589 for those inline functions that need to have out-of-line copies
3590 generated. During that call, we *will* be routed past here. */
3592 timevar_push (TV_SYMOUT
);
3593 (*debug_hooks
->function_decl
) (decl
);
3594 timevar_pop (TV_SYMOUT
);
3596 exit_rest_of_compilation
:
3598 /* In case the function was not output,
3599 don't leave any temporary anonymous types
3600 queued up for sdb output. */
3601 #ifdef SDB_DEBUGGING_INFO
3602 if (write_symbols
== SDB_DEBUG
)
3603 sdbout_types (NULL_TREE
);
3606 reload_completed
= 0;
3607 flow2_completed
= 0;
3610 timevar_push (TV_FINAL
);
3612 /* Clear out the insn_length contents now that they are no
3614 init_insn_lengths ();
3616 /* Show no temporary slots allocated. */
3619 free_basic_block_vars (0);
3620 free_bb_for_insn ();
3622 timevar_pop (TV_FINAL
);
3624 /* Make sure volatile mem refs aren't considered valid operands for
3625 arithmetic insns. We must call this here if this is a nested inline
3626 function, since the above code leaves us in the init_recog state
3627 (from final.c), and the function context push/pop code does not
3628 save/restore volatile_ok.
3630 ??? Maybe it isn't necessary for expand_start_function to call this
3631 anymore if we do it here? */
3633 init_recog_no_volatile ();
3635 /* We're done with this function. Free up memory if we can. */
3636 free_after_parsing (cfun
);
3637 if (! DECL_DEFER_OUTPUT (decl
))
3639 free_after_compilation (cfun
);
3641 /* Clear integrate.c's pointer to the cfun structure we just
3643 DECL_SAVED_INSNS (decl
) = 0;
3649 timevar_pop (TV_REST_OF_COMPILATION
);
3659 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3660 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3661 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3662 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3663 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3664 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"));
3665 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3667 for (i
= ARRAY_SIZE (f_options
); i
--;)
3669 const char *description
= f_options
[i
].description
;
3671 if (description
!= NULL
&& *description
!= 0)
3672 printf (" -f%-21s %s\n",
3673 f_options
[i
].string
, _(description
));
3676 printf (_(" -O[number] Set optimization level to [number]\n"));
3677 printf (_(" -Os Optimize for space rather than speed\n"));
3678 for (i
= LAST_PARAM
; i
--;)
3680 const char *description
= compiler_params
[i
].help
;
3681 const int length
= 21 - strlen (compiler_params
[i
].option
);
3683 if (description
!= NULL
&& *description
!= 0)
3684 printf (" --param %s=<value>%.*s%s\n",
3685 compiler_params
[i
].option
,
3686 length
> 0 ? length
: 1, " ",
3689 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3690 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3691 printf (_(" -w Suppress warnings\n"));
3692 printf (_(" -W Enable extra warnings\n"));
3694 for (i
= ARRAY_SIZE (W_options
); i
--;)
3696 const char *description
= W_options
[i
].description
;
3698 if (description
!= NULL
&& *description
!= 0)
3699 printf (" -W%-21s %s\n",
3700 W_options
[i
].string
, _(description
));
3703 printf (_(" -Wunused Enable unused warnings\n"));
3704 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3705 printf (_(" -p Enable function profiling\n"));
3706 printf (_(" -o <file> Place output into <file> \n"));
3708 -G <number> Put global and static data smaller than <number>\n\
3709 bytes into a special section (on some targets)\n"));
3711 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3713 if (debug_args
[i
].description
!= NULL
)
3714 printf (" -g%-21s %s\n",
3715 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3718 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3719 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3720 printf (_(" -version Display the compiler's version\n"));
3721 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3722 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3723 #if defined INSN_SCHEDULING
3724 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3726 printf (_(" --help Display this information\n"));
3731 /* Display descriptions of language specific options.
3732 If there is no description, note that there is an undocumented option.
3733 If the description is empty, do not display anything. (This allows
3734 options to be deliberately undocumented, for whatever reason).
3735 If the option string is missing, then this is a marker, indicating
3736 that the description string is in fact the name of a language, whose
3737 language specific options are to follow. */
3739 if (ARRAY_SIZE (documented_lang_options
) > 1)
3741 printf (_("\nLanguage specific options:\n"));
3743 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3745 const char *description
= documented_lang_options
[i
].description
;
3746 const char *option
= documented_lang_options
[i
].option
;
3748 if (description
== NULL
)
3753 printf (_(" %-23.23s [undocumented]\n"), option
);
3755 else if (*description
== 0)
3757 else if (option
== NULL
)
3761 (_("\nThere are undocumented %s specific options as well.\n"),
3765 printf (_("\n Options for %s:\n"), description
);
3770 printf (" %-23.23s %s\n", option
, _(description
));
3775 printf (_("\nThere are undocumented %s specific options as well.\n"),
3778 display_target_options ();
3782 display_target_options ()
3785 static bool displayed
= false;
3787 /* Avoid double printing for --help --target-help. */
3792 if (ARRAY_SIZE (target_switches
) > 1
3793 #ifdef TARGET_OPTIONS
3794 || ARRAY_SIZE (target_options
) > 1
3802 printf (_("\nTarget specific options:\n"));
3804 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3806 const char *option
= target_switches
[i
].name
;
3807 const char *description
= target_switches
[i
].description
;
3809 if (option
== NULL
|| *option
== 0)
3811 else if (description
== NULL
)
3816 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3818 else if (*description
!= 0)
3819 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3822 #ifdef TARGET_OPTIONS
3823 for (i
= ARRAY_SIZE (target_options
); i
--;)
3825 const char *option
= target_options
[i
].prefix
;
3826 const char *description
= target_options
[i
].description
;
3828 if (option
== NULL
|| *option
== 0)
3830 else if (description
== NULL
)
3835 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3837 else if (*description
!= 0)
3838 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3844 printf (_("\nThere are undocumented target specific options as well.\n"));
3846 printf (_(" They exist, but they are not documented.\n"));
3851 /* Parse a -d... command line switch. */
3854 decode_d_option (arg
)
3863 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3864 dump_file
[i
].enabled
= 1;
3870 flag_print_asm_name
= 1;
3873 flag_dump_rtl_in_asm
= 1;
3874 flag_print_asm_name
= 1;
3877 graph_dump_format
= vcg
;
3880 rtl_dump_and_exit
= 1;
3885 case 'D': /* These are handled by the preprocessor. */
3891 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3892 if (c
== dump_file
[i
].debug_switch
)
3894 dump_file
[i
].enabled
= 1;
3899 warning ("unrecognized gcc debugging option: %c", c
);
3904 /* Parse a -f... command line switch. ARG is the value after the -f.
3905 It is safe to access 'ARG - 2' to generate the full switch name.
3906 Return the number of strings consumed. */
3909 decode_f_option (arg
)
3913 const char *option_value
= NULL
;
3915 /* Search for the option in the table of binary f options. */
3916 for (j
= ARRAY_SIZE (f_options
); j
--;)
3918 if (!strcmp (arg
, f_options
[j
].string
))
3920 *f_options
[j
].variable
= f_options
[j
].on_value
;
3924 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3925 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3927 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3932 if (!strcmp (arg
, "fast-math"))
3933 set_fast_math_flags (1);
3934 else if (!strcmp (arg
, "no-fast-math"))
3935 set_fast_math_flags (0);
3936 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3937 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3940 read_integral_parameter (option_value
, arg
- 2,
3942 set_param_value ("max-inline-insns", val
);
3944 else if ((option_value
= skip_leading_substring (arg
, "tls-model=")))
3946 if (strcmp (option_value
, "global-dynamic") == 0)
3947 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
3948 else if (strcmp (option_value
, "local-dynamic") == 0)
3949 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
3950 else if (strcmp (option_value
, "initial-exec") == 0)
3951 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
3952 else if (strcmp (option_value
, "local-exec") == 0)
3953 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
3955 warning ("`%s': unknown tls-model option", arg
- 2);
3957 #ifdef INSN_SCHEDULING
3958 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3959 fix_sched_param ("verbose", option_value
);
3961 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3962 fix_register (option_value
, 1, 1);
3963 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3964 fix_register (option_value
, 0, 1);
3965 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3966 fix_register (option_value
, 0, 0);
3967 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3968 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3969 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3971 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3972 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3973 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3974 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3976 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3977 else if ((option_value
3978 = skip_leading_substring (arg
, "stack-limit-register=")))
3980 int reg
= decode_reg_name (option_value
);
3982 error ("unrecognized register name `%s'", option_value
);
3984 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3986 else if ((option_value
3987 = skip_leading_substring (arg
, "stack-limit-symbol=")))
3990 nm
= ggc_strdup (option_value
);
3991 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
3993 else if ((option_value
3994 = skip_leading_substring (arg
, "message-length=")))
3995 output_set_maximum_length
3996 (&global_dc
->buffer
, read_integral_parameter
3997 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
3998 else if ((option_value
3999 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4001 if (!strcmp (option_value
, "once"))
4002 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4003 else if (!strcmp (option_value
, "every-line"))
4004 diagnostic_prefixing_rule (global_dc
)
4005 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4007 error ("unrecognized option `%s'", arg
- 2);
4009 else if (!strcmp (arg
, "no-stack-limit"))
4010 stack_limit_rtx
= NULL_RTX
;
4011 else if (!strcmp (arg
, "preprocessed"))
4012 /* Recognise this switch but do nothing. This prevents warnings
4013 about an unrecognized switch if cpplib has not been linked in. */
4021 /* Parse a -W... command line switch. ARG is the value after the -W.
4022 It is safe to access 'ARG - 2' to generate the full switch name.
4023 Return the number of strings consumed. */
4026 decode_W_option (arg
)
4029 const char *option_value
= NULL
;
4032 /* Search for the option in the table of binary W options. */
4034 for (j
= ARRAY_SIZE (W_options
); j
--;)
4036 if (!strcmp (arg
, W_options
[j
].string
))
4038 *W_options
[j
].variable
= W_options
[j
].on_value
;
4042 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4043 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4045 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4050 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4051 warning ("-Wid-clash-LEN is no longer supported");
4052 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4054 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4056 warn_larger_than
= larger_than_size
!= -1;
4058 else if (!strcmp (arg
, "unused"))
4062 else if (!strcmp (arg
, "no-unused"))
4072 /* Parse a -g... command line switch. ARG is the value after the -g.
4073 It is safe to access 'ARG - 2' to generate the full switch name.
4074 Return the number of strings consumed. */
4077 decode_g_option (arg
)
4080 static unsigned level
= 0;
4081 /* A lot of code assumes write_symbols == NO_DEBUG if the
4082 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4083 of what debugging type has been selected). This records the
4084 selected type. It is an error to specify more than one
4086 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4087 /* Non-zero if debugging format has been explicitly set.
4088 -g and -ggdb don't explicitly set the debugging format so
4089 -gdwarf -g3 is equivalent to -gdwarf3. */
4090 static int type_explicitly_set_p
= 0;
4091 /* Indexed by enum debug_info_type. */
4092 static const char *const debug_type_names
[] =
4094 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4097 /* The maximum admissible debug level value. */
4098 static const unsigned max_debug_level
= 3;
4100 /* Look up ARG in the table. */
4101 for (da
= debug_args
; da
->arg
; da
++)
4103 const int da_len
= strlen (da
->arg
);
4105 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4107 enum debug_info_type type
= da
->debug_type
;
4108 const char *p
= arg
+ da_len
;
4110 if (*p
&& ! ISDIGIT (*p
))
4113 /* A debug flag without a level defaults to level 2.
4114 Note we do not want to call read_integral_parameter
4115 for that case since it will call atoi which
4118 ??? We may want to generalize the interface to
4119 read_integral_parameter to better handle this case
4120 if this case shows up often. */
4122 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4124 level
= (level
== 0) ? 2 : level
;
4126 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4128 error ("use -gdwarf -g%d for DWARF v1, level %d",
4131 error ("use -gdwarf-2 for DWARF v2");
4134 if (level
> max_debug_level
)
4137 ignoring option `%s' due to invalid debug level specification",
4139 level
= debug_info_level
;
4142 if (type
== NO_DEBUG
)
4144 type
= PREFERRED_DEBUGGING_TYPE
;
4146 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4148 #ifdef DWARF2_DEBUGGING_INFO
4149 type
= DWARF2_DEBUG
;
4151 #ifdef DBX_DEBUGGING_INFO
4158 if (type
== NO_DEBUG
)
4159 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4161 /* Does it conflict with an already selected type? */
4162 if (type_explicitly_set_p
4163 /* -g/-ggdb don't conflict with anything. */
4164 && da
->debug_type
!= NO_DEBUG
4165 && type
!= selected_debug_type
)
4166 warning ("`%s' ignored, conflicts with `-g%s'",
4167 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4170 /* If the format has already been set, -g/-ggdb
4171 only change the debug level. */
4172 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4173 /* Don't change debugging type. */
4177 selected_debug_type
= type
;
4178 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4181 write_symbols
= (level
== 0
4183 : selected_debug_type
);
4184 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4185 debug_info_level
= (enum debug_info_level
) level
;
4198 /* Decode the first argument in the argv as a language-independent option.
4199 Return the number of strings consumed. */
4202 independent_decode_option (argc
, argv
)
4206 char *arg
= argv
[0];
4208 if (arg
[0] != '-' || arg
[1] == 0)
4220 if (!strcmp (arg
, "-help"))
4223 exit_after_options
= 1;
4226 if (!strcmp (arg
, "-target-help"))
4228 display_target_options ();
4229 exit_after_options
= 1;
4232 if (!strcmp (arg
, "-version"))
4234 print_version (stderr
, "");
4235 exit_after_options
= 1;
4238 /* Handle '--param <name>=<value>'. */
4239 if (strcmp (arg
, "-param") == 0)
4245 error ("-param option missing argument");
4249 /* Get the '<name>=<value>' parameter. */
4251 /* Look for the `='. */
4252 equal
= strchr (arg
, '=');
4254 error ("invalid --param option: %s", arg
);
4259 /* Zero out the `=' sign so that we get two separate strings. */
4261 /* Figure out what value is specified. */
4262 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4263 if (val
!= INVALID_PARAM_VAL
)
4264 set_param_value (arg
, val
);
4266 error ("invalid parameter value `%s'", equal
+ 1);
4281 /* Already been treated in main (). Do nothing. */
4285 set_target_switch (arg
+ 1);
4289 return decode_f_option (arg
+ 1);
4292 return decode_g_option (arg
+ 1);
4295 if (!strcmp (arg
, "dumpbase"))
4300 dump_base_name
= argv
[1];
4304 decode_d_option (arg
+ 1);
4308 if (!strcmp (arg
, "pedantic"))
4310 else if (!strcmp (arg
, "pedantic-errors"))
4311 flag_pedantic_errors
= pedantic
= 1;
4312 else if (arg
[1] == 0)
4319 if (!strcmp (arg
, "quiet"))
4326 if (!strcmp (arg
, "version"))
4334 inhibit_warnings
= 1;
4343 /* We save the value of warn_uninitialized, since if they put
4344 -Wuninitialized on the command line, we need to generate a
4345 warning about not using it without also specifying -O. */
4346 if (warn_uninitialized
!= 1)
4347 warn_uninitialized
= 2;
4350 return decode_W_option (arg
+ 1);
4354 if (!strncmp (arg
, "aux-info", 8))
4361 aux_info_file_name
= argv
[1];
4362 flag_gen_aux_info
= 1;
4365 else if (arg
[8] == '=')
4367 aux_info_file_name
= arg
+ 9;
4368 flag_gen_aux_info
= 1;
4383 asm_file_name
= argv
[1];
4398 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4403 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4407 if (g_switch_val
== -1)
4411 g_switch_set
= TRUE
;
4412 g_switch_value
= g_switch_val
;
4422 /* Decode -m switches. */
4423 /* Decode the switch -mNAME. */
4426 set_target_switch (name
)
4430 int valid_target_option
= 0;
4432 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4433 if (!strcmp (target_switches
[j
].name
, name
))
4435 if (target_switches
[j
].value
< 0)
4436 target_flags
&= ~-target_switches
[j
].value
;
4438 target_flags
|= target_switches
[j
].value
;
4441 if (target_switches
[j
].value
< 0)
4442 target_flags_explicit
|= -target_switches
[j
].value
;
4444 target_flags_explicit
|= target_switches
[j
].value
;
4446 valid_target_option
= 1;
4449 #ifdef TARGET_OPTIONS
4450 if (!valid_target_option
)
4451 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4453 int len
= strlen (target_options
[j
].prefix
);
4454 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4456 *target_options
[j
].variable
= name
+ len
;
4457 valid_target_option
= 1;
4462 if (!valid_target_option
)
4463 error ("invalid option `%s'", name
);
4466 /* Print version information to FILE.
4467 Each line begins with INDENT (for the case where FILE is the
4468 assembler output file). */
4471 print_version (file
, indent
)
4476 #define __VERSION__ "[?]"
4480 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4482 "%s%s%s version %s (%s) compiled by CC.\n"
4484 , indent
, *indent
!= 0 ? " " : "",
4485 lang_hooks
.name
, version_string
, TARGET_NAME
,
4486 indent
, __VERSION__
);
4489 /* Print an option value and return the adjusted position in the line.
4490 ??? We don't handle error returns from fprintf (disk full); presumably
4491 other code will catch a disk full though. */
4494 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4497 const char *indent
, *sep
, *term
, *type
, *name
;
4499 /* The ultrix fprintf returns 0 on success, so compute the result we want
4500 here since we need it for the following test. */
4501 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4506 fprintf (file
, "%s", term
);
4511 fprintf (file
, "%s", indent
);
4512 pos
= strlen (indent
);
4514 fprintf (file
, "%s%s%s", sep
, type
, name
);
4519 /* Print active target switches to FILE.
4520 POS is the current cursor position and MAX is the size of a "line".
4521 Each line begins with INDENT and ends with TERM.
4522 Each switch is separated from the next by SEP. */
4525 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4528 const char *indent
, *sep
, *term
;
4533 /* Print the options as passed. */
4535 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4536 _("options passed: "), "");
4538 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4542 if (strcmp (*p
, "-o") == 0)
4548 if (strcmp (*p
, "-quiet") == 0)
4550 if (strcmp (*p
, "-version") == 0)
4555 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4558 fprintf (file
, "%s", term
);
4560 /* Print the -f and -m options that have been enabled.
4561 We don't handle language specific options but printing argv
4564 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4565 _("options enabled: "), "");
4567 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4568 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4569 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4570 "-f", f_options
[j
].string
);
4572 /* Print target specific options. */
4574 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4575 if (target_switches
[j
].name
[0] != '\0'
4576 && target_switches
[j
].value
> 0
4577 && ((target_switches
[j
].value
& target_flags
)
4578 == target_switches
[j
].value
))
4580 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4581 "-m", target_switches
[j
].name
);
4584 #ifdef TARGET_OPTIONS
4585 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4586 if (*target_options
[j
].variable
!= NULL
)
4589 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4590 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4591 prefix
, *target_options
[j
].variable
);
4595 fprintf (file
, "%s", term
);
4598 /* Open assembly code output file. Do this even if -fsyntax-only is
4599 on, because then the driver will have provided the name of a
4600 temporary file or bit bucket for us. NAME is the file specified on
4601 the command line, possibly NULL. */
4603 init_asm_output (name
)
4606 if (name
== NULL
&& asm_file_name
== 0)
4607 asm_out_file
= stdout
;
4610 if (asm_file_name
== 0)
4612 int len
= strlen (dump_base_name
);
4613 char *dumpname
= (char *) xmalloc (len
+ 6);
4614 memcpy (dumpname
, dump_base_name
, len
+ 1);
4615 strip_off_ending (dumpname
, len
);
4616 strcat (dumpname
, ".s");
4617 asm_file_name
= dumpname
;
4619 if (!strcmp (asm_file_name
, "-"))
4620 asm_out_file
= stdout
;
4622 asm_out_file
= fopen (asm_file_name
, "w");
4623 if (asm_out_file
== 0)
4624 fatal_io_error ("can't open %s for writing", asm_file_name
);
4627 #ifdef IO_BUFFER_SIZE
4628 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4629 _IOFBF
, IO_BUFFER_SIZE
);
4632 if (!flag_syntax_only
)
4634 #ifdef ASM_FILE_START
4635 ASM_FILE_START (asm_out_file
);
4638 #ifdef ASM_COMMENT_START
4639 if (flag_verbose_asm
)
4641 /* Print the list of options in effect. */
4642 print_version (asm_out_file
, ASM_COMMENT_START
);
4643 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4644 ASM_COMMENT_START
, " ", "\n");
4645 /* Add a blank line here so it appears in assembler output but not
4647 fprintf (asm_out_file
, "\n");
4653 /* Initialization of the front end environment, before command line
4654 options are parsed. Signal handlers, internationalization etc.
4655 ARGV0 is main's argv[0]. */
4657 general_init (argv0
)
4662 p
= argv0
+ strlen (argv0
);
4663 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4667 xmalloc_set_program_name (progname
);
4671 gcc_init_libintl ();
4673 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4675 signal (SIGSEGV
, crash_signal
);
4678 signal (SIGILL
, crash_signal
);
4681 signal (SIGBUS
, crash_signal
);
4684 signal (SIGABRT
, crash_signal
);
4686 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4687 signal (SIGIOT
, crash_signal
);
4690 signal (SIGFPE
, crash_signal
);
4693 /* Initialize the diagnostics reporting machinery, so option parsing
4694 can give warnings and errors. */
4695 diagnostic_initialize (global_dc
);
4698 /* Parse command line options and set default flag values, called
4699 after language-independent option-independent initialization. Do
4700 minimal options processing. Outputting diagnostics is OK, but GC
4701 and identifier hashtables etc. are not initialized yet.
4703 Return non-zero to suppress compiler back end initialization. */
4705 parse_options_and_default_flags (argc
, argv
)
4711 /* Save in case md file wants to emit args as a comment. */
4715 /* Initialize register usage now so switches may override. */
4718 /* Register the language-independent parameters. */
4719 add_params (lang_independent_params
, LAST_PARAM
);
4721 /* Perform language-specific options initialization. */
4722 (*lang_hooks
.init_options
) ();
4724 /* Scan to see what optimization level has been specified. That will
4725 determine the default value of many flags. */
4726 for (i
= 1; i
< argc
; i
++)
4728 if (!strcmp (argv
[i
], "-O"))
4733 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4735 /* Handle -Os, -O2, -O3, -O69, ... */
4736 char *p
= &argv
[i
][2];
4738 if ((p
[0] == 's') && (p
[1] == 0))
4742 /* Optimizing for size forces optimize to be 2. */
4747 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4748 if (optimize_val
!= -1)
4750 optimize
= optimize_val
;
4759 flag_merge_constants
= 0;
4765 flag_thread_jumps
= 1;
4767 flag_delayed_branch
= 1;
4769 #ifdef CAN_DEBUG_WITHOUT_FP
4770 flag_omit_frame_pointer
= 1;
4772 flag_guess_branch_prob
= 1;
4773 flag_cprop_registers
= 1;
4774 flag_loop_optimize
= 1;
4775 flag_crossjumping
= 1;
4776 flag_if_conversion
= 1;
4777 flag_if_conversion2
= 1;
4782 flag_optimize_sibling_calls
= 1;
4783 flag_cse_follow_jumps
= 1;
4784 flag_cse_skip_blocks
= 1;
4786 flag_expensive_optimizations
= 1;
4787 flag_strength_reduce
= 1;
4788 flag_rerun_cse_after_loop
= 1;
4789 flag_rerun_loop_opt
= 1;
4790 flag_caller_saves
= 1;
4793 #ifdef INSN_SCHEDULING
4794 flag_schedule_insns
= 1;
4795 flag_schedule_insns_after_reload
= 1;
4798 flag_strict_aliasing
= 1;
4799 flag_delete_null_pointer_checks
= 1;
4800 flag_reorder_blocks
= 1;
4801 flag_reorder_functions
= 1;
4806 flag_inline_functions
= 1;
4807 flag_rename_registers
= 1;
4810 if (optimize
< 2 || optimize_size
)
4815 align_functions
= 1;
4818 /* Initialize whether `char' is signed. */
4819 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4820 #ifdef DEFAULT_SHORT_ENUMS
4821 /* Initialize how much space enums occupy, by default. */
4822 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4825 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4828 set_target_switch ("");
4830 /* Unwind tables are always present in an ABI-conformant IA-64
4831 object file, so the default should be ON. */
4832 #ifdef IA64_UNWIND_INFO
4833 flag_unwind_tables
= IA64_UNWIND_INFO
;
4836 #ifdef OPTIMIZATION_OPTIONS
4837 /* Allow default optimizations to be specified on a per-machine basis. */
4838 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4841 /* Perform normal command line switch decoding. */
4842 for (i
= 1; i
< argc
;)
4845 int indep_processed
;
4847 /* Give the language a chance to decode the option for itself. */
4848 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4850 if (lang_processed
>= 0)
4851 /* Now see if the option also has a language independent meaning.
4852 Some options are both language specific and language independent,
4854 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4857 lang_processed
= -lang_processed
;
4858 indep_processed
= 0;
4861 if (lang_processed
|| indep_processed
)
4862 i
+= MAX (lang_processed
, indep_processed
);
4865 const char *option
= NULL
;
4866 const char *lang
= NULL
;
4869 /* It is possible that the command line switch is not valid for the
4870 current language, but it is valid for another language. In order
4871 to be compatible with previous versions of the compiler (which
4872 did not issue an error message in this case) we check for this
4873 possibility here. If we do find a match, then if extra_warnings
4874 is set we generate a warning message, otherwise we will just
4875 ignore the option. */
4876 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4878 option
= documented_lang_options
[j
].option
;
4881 lang
= documented_lang_options
[j
].description
;
4882 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4886 if (j
!= ARRAY_SIZE (documented_lang_options
))
4890 warning ("ignoring command line option '%s'", argv
[i
]);
4893 ("(it is valid for %s but not the selected language)",
4897 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4898 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4900 error ("unrecognized option `%s'", argv
[i
]);
4906 if (flag_no_inline
== 2)
4909 flag_really_no_inline
= flag_no_inline
;
4911 /* Set flag_no_inline before the post_options () hook. The C front
4912 ends use it to determine tree inlining defaults. FIXME: such
4913 code should be lang-independent when all front ends use tree
4914 inlining, in which case it, and this condition, should be moved
4915 to the top of process_options() instead. */
4918 /* Inlining does not work if not optimizing,
4919 so force it not to be done. */
4923 /* The c_decode_option function and decode_option hook set
4924 this to `2' if -Wall is used, so we can avoid giving out
4925 lots of errors for people who don't realize what -Wall does. */
4926 if (warn_uninitialized
== 1)
4927 warning ("-Wuninitialized is not supported without -O");
4930 if (flag_really_no_inline
== 2)
4931 flag_really_no_inline
= flag_no_inline
;
4933 /* All command line options have been parsed; allow the front end to
4934 perform consistency checks, etc. */
4935 return (*lang_hooks
.post_options
) ();
4938 /* Process the options that have been parsed. */
4942 #ifdef OVERRIDE_OPTIONS
4943 /* Some machines may reject certain combinations of options. */
4947 /* Set up the align_*_log variables, defaulting them to 1 if they
4948 were still unset. */
4949 if (align_loops
<= 0) align_loops
= 1;
4950 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4951 align_loops_max_skip
= align_loops
- 1;
4952 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4953 if (align_jumps
<= 0) align_jumps
= 1;
4954 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4955 align_jumps_max_skip
= align_jumps
- 1;
4956 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4957 if (align_labels
<= 0) align_labels
= 1;
4958 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4959 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4960 align_labels_max_skip
= align_labels
- 1;
4961 if (align_functions
<= 0) align_functions
= 1;
4962 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4964 /* Unrolling all loops implies that standard loop unrolling must also
4966 if (flag_unroll_all_loops
)
4967 flag_unroll_loops
= 1;
4968 /* Loop unrolling requires that strength_reduction be on also. Silently
4969 turn on strength reduction here if it isn't already on. Also, the loop
4970 unrolling code assumes that cse will be run after loop, so that must
4971 be turned on also. */
4972 if (flag_unroll_loops
)
4974 flag_strength_reduce
= 1;
4975 flag_rerun_cse_after_loop
= 1;
4978 if (flag_non_call_exceptions
)
4979 flag_asynchronous_unwind_tables
= 1;
4980 if (flag_asynchronous_unwind_tables
)
4981 flag_unwind_tables
= 1;
4983 /* Warn about options that are not supported on this machine. */
4984 #ifndef INSN_SCHEDULING
4985 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4986 warning ("instruction scheduling not supported on this target machine");
4989 if (flag_delayed_branch
)
4990 warning ("this target machine does not have delayed branches");
4993 user_label_prefix
= USER_LABEL_PREFIX
;
4994 if (flag_leading_underscore
!= -1)
4996 /* If the default prefix is more complicated than "" or "_",
4997 issue a warning and ignore this option. */
4998 if (user_label_prefix
[0] == 0 ||
4999 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
5001 user_label_prefix
= flag_leading_underscore
? "_" : "";
5004 warning ("-f%sleading-underscore not supported on this target machine",
5005 flag_leading_underscore
? "" : "no-");
5008 /* If we are in verbose mode, write out the version and maybe all the
5009 option flags in use. */
5012 print_version (stderr
, "");
5014 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
5020 if (flag_syntax_only
)
5022 write_symbols
= NO_DEBUG
;
5026 /* Now we know write_symbols, set up the debug hooks based on it.
5027 By default we do nothing for debug output. */
5028 #if defined(DBX_DEBUGGING_INFO)
5029 if (write_symbols
== DBX_DEBUG
)
5030 debug_hooks
= &dbx_debug_hooks
;
5032 #if defined(XCOFF_DEBUGGING_INFO)
5033 if (write_symbols
== XCOFF_DEBUG
)
5034 debug_hooks
= &xcoff_debug_hooks
;
5036 #ifdef SDB_DEBUGGING_INFO
5037 if (write_symbols
== SDB_DEBUG
)
5038 debug_hooks
= &sdb_debug_hooks
;
5040 #ifdef DWARF_DEBUGGING_INFO
5041 if (write_symbols
== DWARF_DEBUG
)
5042 debug_hooks
= &dwarf_debug_hooks
;
5044 #ifdef DWARF2_DEBUGGING_INFO
5045 if (write_symbols
== DWARF2_DEBUG
)
5046 debug_hooks
= &dwarf2_debug_hooks
;
5048 #ifdef VMS_DEBUGGING_INFO
5049 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
5050 debug_hooks
= &vmsdbg_debug_hooks
;
5053 /* If auxiliary info generation is desired, open the output file.
5054 This goes in the same directory as the source file--unlike
5055 all the other output files. */
5056 if (flag_gen_aux_info
)
5058 aux_info_file
= fopen (aux_info_file_name
, "w");
5059 if (aux_info_file
== 0)
5060 fatal_io_error ("can't open %s", aux_info_file_name
);
5063 if (! targetm
.have_named_sections
)
5065 if (flag_function_sections
)
5067 warning ("-ffunction-sections not supported for this target");
5068 flag_function_sections
= 0;
5070 if (flag_data_sections
)
5072 warning ("-fdata-sections not supported for this target");
5073 flag_data_sections
= 0;
5077 if (flag_function_sections
&& profile_flag
)
5079 warning ("-ffunction-sections disabled; it makes profiling impossible");
5080 flag_function_sections
= 0;
5083 #ifndef HAVE_prefetch
5084 if (flag_prefetch_loop_arrays
)
5086 warning ("-fprefetch-loop-arrays not supported for this target");
5087 flag_prefetch_loop_arrays
= 0;
5090 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
5092 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5093 flag_prefetch_loop_arrays
= 0;
5097 /* This combination of options isn't handled for i386 targets and doesn't
5098 make much sense anyway, so don't allow it. */
5099 if (flag_prefetch_loop_arrays
&& optimize_size
)
5101 warning ("-fprefetch-loop-arrays is not supported with -Os");
5102 flag_prefetch_loop_arrays
= 0;
5105 #ifndef OBJECT_FORMAT_ELF
5106 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5107 warning ("-ffunction-sections may affect debugging on some targets");
5110 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5111 if (flag_signaling_nans
)
5112 flag_trapping_math
= 1;
5115 /* Language-independent initialization, before language-dependent
5118 lang_independent_init (no_backend
)
5121 /* Initialize the garbage-collector, and string pools. */
5130 /* init_emit_once uses reg_raw_mode and therefore must be called
5131 after init_regs which initialized reg_raw_mode. */
5133 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5134 || debug_info_level
== DINFO_LEVEL_VERBOSE
5135 #ifdef VMS_DEBUGGING_INFO
5136 /* Enable line number info for traceback */
5137 || debug_info_level
> DINFO_LEVEL_NONE
5139 || flag_test_coverage
5140 || warn_notreached
);
5141 init_fake_stack_mems ();
5145 init_function_once ();
5146 init_varasm_once ();
5148 /* The following initialization functions need to generate rtl, so
5149 provide a dummy function context for them. */
5150 init_dummy_function_start ();
5152 if (flag_caller_saves
)
5153 init_caller_save ();
5154 expand_dummy_function_end ();
5157 /* Language-dependent initialization. Returns non-zero on success. */
5159 lang_dependent_init (name
)
5162 if (dump_base_name
== 0)
5163 dump_base_name
= name
? name
: "gccdump";
5165 /* Front-end initialization. This hook can assume that GC,
5166 identifier hashes etc. are set up, but debug initialization is
5167 not done yet. This routine must return the original filename
5168 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5169 name
= (*lang_hooks
.init
) (name
);
5173 /* Is this duplication necessary? */
5174 name
= ggc_strdup (name
);
5175 main_input_filename
= input_filename
= name
;
5176 init_asm_output (name
);
5178 /* These create various _DECL nodes, so need to be called after the
5179 front end is initialized. */
5183 /* The following initialization functions need to generate rtl, so
5184 provide a dummy function context for them. */
5185 init_dummy_function_start ();
5187 expand_dummy_function_end ();
5189 /* Put an entry on the input file stack for the main input file. */
5190 push_srcloc (input_filename
, 0);
5192 /* If dbx symbol table desired, initialize writing it and output the
5193 predefined types. */
5194 timevar_push (TV_SYMOUT
);
5196 #ifdef DWARF2_UNWIND_INFO
5197 if (dwarf2out_do_frame ())
5198 dwarf2out_frame_init ();
5201 /* Now we have the correct original filename, we can initialize
5203 (*debug_hooks
->init
) (name
);
5205 timevar_pop (TV_SYMOUT
);
5210 /* Clean up: close opened files, etc. */
5215 /* Close the dump files. */
5216 if (flag_gen_aux_info
)
5218 fclose (aux_info_file
);
5220 unlink (aux_info_file_name
);
5223 /* Close non-debugging input and output files. Take special care to note
5224 whether fclose returns an error, since the pages might still be on the
5225 buffer chain while the file is open. */
5229 if (ferror (asm_out_file
) != 0)
5230 fatal_io_error ("error writing to %s", asm_file_name
);
5231 if (fclose (asm_out_file
) != 0)
5232 fatal_io_error ("error closing %s", asm_file_name
);
5235 /* Do whatever is necessary to finish printing the graphs. */
5236 if (graph_dump_format
!= no_graph
)
5240 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5241 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5246 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5247 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5248 finish_graph_dump_file (dump_base_name
, suffix
);
5255 ggc_print_statistics ();
5256 stringpool_statistics ();
5257 dump_tree_statistics ();
5260 /* Free up memory for the benefit of leak detectors. */
5263 /* Language-specific end of compilation actions. */
5264 (*lang_hooks
.finish
) ();
5267 /* Initialize the compiler, and compile the input file. */
5269 do_compile (no_backend
)
5272 /* The bulk of command line switch processing. */
5275 /* We cannot start timing until after options are processed since that
5276 says if we run timers or not. */
5278 timevar_start (TV_TOTAL
);
5280 /* Language-independent initialization. Also sets up GC, identifier
5281 hashes etc., and the back-end if requested. */
5282 lang_independent_init (no_backend
);
5284 /* Language-dependent initialization. Returns true on success. */
5285 if (lang_dependent_init (filename
))
5290 /* Stop timing and print the times. */
5291 timevar_stop (TV_TOTAL
);
5292 timevar_print (stderr
);
5295 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5296 Decode command args, then call compile_file.
5297 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5298 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5300 It is not safe to call this function more than once. */
5303 toplev_main (argc
, argv
)
5309 /* Initialization of GCC's environment, and diagnostics. */
5310 general_init (argv
[0]);
5312 /* Parse the options and do minimal processing; basically just
5313 enough to default flags appropriately. */
5314 no_backend
= parse_options_and_default_flags (argc
, argv
);
5316 /* Exit early if we can (e.g. -help). */
5317 if (!errorcount
&& !exit_after_options
)
5318 do_compile (no_backend
);
5320 if (errorcount
|| sorrycount
)
5321 return (FATAL_EXIT_CODE
);
5323 return (SUCCESS_EXIT_CODE
);