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"
73 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
74 #include "dwarf2out.h"
77 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
81 #ifdef SDB_DEBUGGING_INFO
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
94 /* Carry information from ASM_DECLARE_OBJECT_NAME
95 to ASM_FINISH_DECLARE_OBJECT. */
97 extern int size_directive_output
;
98 extern tree last_assemble_variable_decl
;
100 static void general_init
PARAMS ((char *));
101 static void parse_options_and_default_flags
PARAMS ((int, char **));
102 static void do_compile
PARAMS ((void));
103 static void process_options
PARAMS ((void));
104 static void lang_independent_init
PARAMS ((void));
105 static int lang_dependent_init
PARAMS ((const char *));
106 static void init_asm_output
PARAMS ((const char *));
107 static void finalize
PARAMS ((void));
109 static void set_target_switch
PARAMS ((const char *));
111 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
112 static void compile_file
PARAMS ((void));
113 static void display_help
PARAMS ((void));
114 static void display_target_options
PARAMS ((void));
116 static void decode_d_option
PARAMS ((const char *));
117 static int decode_f_option
PARAMS ((const char *));
118 static int decode_W_option
PARAMS ((const char *));
119 static int decode_g_option
PARAMS ((const char *));
120 static unsigned int independent_decode_option
PARAMS ((int, char **));
122 static void print_version
PARAMS ((FILE *, const char *));
123 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
124 const char *, const char *,
125 const char *, const char *));
126 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
127 const char *, const char *));
129 /* Nonzero to dump debug info whilst parsing (-dy option). */
130 static int set_yydebug
;
132 /* Length of line when printing switch values. */
135 /* Name of program invoked, sans directories. */
137 const char *progname
;
139 /* Copy of arguments to toplev_main. */
143 /* Name of current original source file (what was input to cpp).
144 This comes from each #-command in the actual input. */
146 const char *input_filename
;
148 /* Name of top-level original source file (what was input to cpp).
149 This comes from the #-command at the beginning of the actual input.
150 If there isn't any there, then this is the cc1 input file name. */
152 const char *main_input_filename
;
154 /* Current line number in real source file. */
158 /* Nonzero if it is unsafe to create any new pseudo registers. */
161 /* Stack of currently pending input files. */
163 struct file_stack
*input_file_stack
;
165 /* Incremented on each change to input_file_stack. */
166 int input_file_stack_tick
;
168 /* Name to use as base of names for dump output files. */
170 const char *dump_base_name
;
172 /* Format to use to print dumpfile index value */
173 #ifndef DUMPFILE_FORMAT
174 #define DUMPFILE_FORMAT ".%02d."
177 /* Bit flags that specify the machine subtype we are compiling for.
178 Bits are tested using macros TARGET_... defined in the tm.h file
179 and set by `-m...' switches. Must be defined in rtlanal.c. */
181 extern int target_flags
;
183 /* Debug hooks - dependent upon command line options. */
185 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
187 /* Describes a dump file. */
189 struct dump_file_info
191 /* The unique extension to apply, e.g. ".jump". */
192 const char *const extension
;
194 /* The -d<c> character that enables this dump file. */
195 char const debug_switch
;
197 /* True if there is a corresponding graph dump file. */
198 char const graph_dump_p
;
200 /* True if the user selected this dump. */
203 /* True if the files have been initialized (ie truncated). */
207 /* Enumerate the extant dump files. */
247 /* Describes all the dump files. Should be kept in order of the
248 pass and in sync with dump_file_index above.
250 Remaining -d letters:
256 static struct dump_file_info dump_file
[DFI_MAX
] =
258 { "rtl", 'r', 0, 0, 0 },
259 { "sibling", 'i', 0, 0, 0 },
260 { "eh", 'h', 0, 0, 0 },
261 { "jump", 'j', 0, 0, 0 },
262 { "ssa", 'e', 1, 0, 0 },
263 { "ssaccp", 'W', 1, 0, 0 },
264 { "ssadce", 'X', 1, 0, 0 },
265 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
266 { "null", 'u', 0, 0, 0 },
267 { "cse", 's', 0, 0, 0 },
268 { "addressof", 'F', 0, 0, 0 },
269 { "gcse", 'G', 1, 0, 0 },
270 { "loop", 'L', 1, 0, 0 },
271 { "cfg", 'f', 1, 0, 0 },
272 { "bp", 'b', 1, 0, 0 },
273 { "cse2", 't', 1, 0, 0 },
274 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
275 { "combine", 'c', 1, 0, 0 },
276 { "ce", 'C', 1, 0, 0 },
277 { "regmove", 'N', 1, 0, 0 },
278 { "sched", 'S', 1, 0, 0 },
279 { "lreg", 'l', 1, 0, 0 },
280 { "greg", 'g', 1, 0, 0 },
281 { "postreload", 'o', 1, 0, 0 },
282 { "flow2", 'w', 1, 0, 0 },
283 { "peephole2", 'z', 1, 0, 0 },
284 { "rnreg", 'n', 1, 0, 0 },
285 { "ce2", 'E', 1, 0, 0 },
286 { "sched2", 'R', 1, 0, 0 },
287 { "stack", 'k', 1, 0, 0 },
288 { "bbro", 'B', 1, 0, 0 },
289 { "mach", 'M', 1, 0, 0 },
290 { "dbr", 'd', 0, 0, 0 },
293 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
294 static void close_dump_file
PARAMS ((enum dump_file_index
,
295 void (*) (FILE *, rtx
), rtx
));
297 /* Other flags saying which kinds of debugging dump have been requested. */
299 int rtl_dump_and_exit
;
300 int flag_print_asm_name
;
301 static int version_flag
;
302 static char *filename
;
303 enum graph_dump_types graph_dump_format
;
305 /* Name for output file of assembly code, specified with -o. */
309 /* Value of the -G xx switch, and whether it was passed or not. */
313 /* Type(s) of debugging information we are producing (if any).
314 See flags.h for the definitions of the different possible
315 types of debugging information. */
316 enum debug_info_type write_symbols
= NO_DEBUG
;
318 /* Level of debugging information we are producing. See flags.h
319 for the definitions of the different possible levels. */
320 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
322 /* Nonzero means use GNU-only extensions in the generated symbolic
323 debugging information. */
324 /* Currently, this only has an effect when write_symbols is set to
325 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
326 int use_gnu_debug_info_extensions
= 0;
328 /* Nonzero means do optimizations. -O.
329 Particular numeric values stand for particular amounts of optimization;
330 thus, -O2 stores 2 here. However, the optimizations beyond the basic
331 ones are not controlled directly by this variable. Instead, they are
332 controlled by individual `flag_...' variables that are defaulted
333 based on this variable. */
337 /* Nonzero means optimize for size. -Os.
338 The only valid values are zero and non-zero. When optimize_size is
339 non-zero, optimize defaults to 2, but certain individual code
340 bloating optimizations are disabled. */
342 int optimize_size
= 0;
344 /* Nonzero if we should exit after parsing options. */
345 static int exit_after_options
= 0;
347 /* The FUNCTION_DECL for the function currently being compiled,
348 or 0 if between functions. */
349 tree current_function_decl
;
351 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
353 tree current_function_func_begin_label
;
355 /* Nonzero if doing dwarf2 duplicate elimination. */
357 int flag_eliminate_dwarf2_dups
= 0;
359 /* Nonzero if generating code to do profiling. */
361 int profile_flag
= 0;
363 /* Nonzero if generating code to profile program flow graph arcs. */
365 int profile_arc_flag
= 0;
367 /* Nonzero if we should not attempt to generate thread-safe
368 code to profile program flow graph arcs. */
370 int flag_unsafe_profile_arcs
= 0;
372 /* Nonzero if generating info for gcov to calculate line test coverage. */
374 int flag_test_coverage
= 0;
376 /* Nonzero indicates that branch taken probabilities should be calculated. */
378 int flag_branch_probabilities
= 0;
380 /* Nonzero if basic blocks should be reordered. */
382 int flag_reorder_blocks
= 0;
384 /* Nonzero if functions should be reordered. */
386 int flag_reorder_functions
= 0;
388 /* Nonzero if registers should be renamed. */
390 int flag_rename_registers
= 0;
391 int flag_cprop_registers
= 0;
393 /* Nonzero for -pedantic switch: warn about anything
394 that standard spec forbids. */
398 /* Temporarily suppress certain warnings.
399 This is set while reading code from a system header file. */
401 int in_system_header
= 0;
403 /* Don't print functions as they are compiled. -quiet. */
407 /* Print times taken by the various passes. -ftime-report. */
411 /* Print memory still in use at end of compilation (which may have little
412 to do with peak memory consumption). -fmem-report. */
416 /* Non-zero means to collect statistics which might be expensive
417 and to print them when we are done. */
418 int flag_detailed_statistics
= 0;
423 /* Nonzero means `char' should be signed. */
425 int flag_signed_char
;
427 /* Nonzero means give an enum type only as many bytes as it needs. */
429 int flag_short_enums
;
431 /* Nonzero for -fcaller-saves: allocate values in regs that need to
432 be saved across function calls, if that produces overall better code.
433 Optional now, so people can test it. */
435 #ifdef DEFAULT_CALLER_SAVES
436 int flag_caller_saves
= 1;
438 int flag_caller_saves
= 0;
441 /* Nonzero if structures and unions should be returned in memory.
443 This should only be defined if compatibility with another compiler or
444 with an ABI is needed, because it results in slower code. */
446 #ifndef DEFAULT_PCC_STRUCT_RETURN
447 #define DEFAULT_PCC_STRUCT_RETURN 1
450 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
452 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
454 /* Nonzero for -fforce-mem: load memory value into a register
455 before arithmetic on it. This makes better cse but slower compilation. */
457 int flag_force_mem
= 0;
459 /* Nonzero for -fforce-addr: load memory address into a register before
460 reference to memory. This makes better cse but slower compilation. */
462 int flag_force_addr
= 0;
464 /* Nonzero for -fdefer-pop: don't pop args after each function call;
465 instead save them up to pop many calls' args with one insns. */
467 int flag_defer_pop
= 0;
469 /* Nonzero for -ffloat-store: don't allocate floats and doubles
470 in extended-precision registers. */
472 int flag_float_store
= 0;
474 /* Nonzero for -fcse-follow-jumps:
475 have cse follow jumps to do a more extensive job. */
477 int flag_cse_follow_jumps
;
479 /* Nonzero for -fcse-skip-blocks:
480 have cse follow a branch around a block. */
481 int flag_cse_skip_blocks
;
483 /* Nonzero for -fexpensive-optimizations:
484 perform miscellaneous relatively-expensive optimizations. */
485 int flag_expensive_optimizations
;
487 /* Nonzero for -fthread-jumps:
488 have jump optimize output of loop. */
490 int flag_thread_jumps
;
492 /* Nonzero enables strength-reduction in loop.c. */
494 int flag_strength_reduce
= 0;
496 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
497 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
498 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
501 int flag_unroll_loops
;
503 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
504 This is generally not a win. */
506 int flag_unroll_all_loops
;
508 /* Nonzero enables prefetch optimizations for arrays in loops. */
510 int flag_prefetch_loop_arrays
;
512 /* Nonzero forces all invariant computations in loops to be moved
515 int flag_move_all_movables
= 0;
517 /* Nonzero forces all general induction variables in loops to be
520 int flag_reduce_all_givs
= 0;
522 /* Nonzero to perform full register move optimization passes. This is the
525 int flag_regmove
= 0;
527 /* Nonzero for -fwritable-strings:
528 store string constants in data segment and don't uniquize them. */
530 int flag_writable_strings
= 0;
532 /* Nonzero means don't put addresses of constant functions in registers.
533 Used for compiling the Unix kernel, where strange substitutions are
534 done on the assembly output. */
536 int flag_no_function_cse
= 0;
538 /* Nonzero for -fomit-frame-pointer:
539 don't make a frame pointer in simple functions that don't require one. */
541 int flag_omit_frame_pointer
= 0;
543 /* Nonzero means place each function into its own section on those platforms
544 which support arbitrary section names and unlimited numbers of sections. */
546 int flag_function_sections
= 0;
548 /* ... and similar for data. */
550 int flag_data_sections
= 0;
552 /* Nonzero to inhibit use of define_optimization peephole opts. */
554 int flag_no_peephole
= 0;
556 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
558 int flag_optimize_sibling_calls
= 0;
560 /* Nonzero means the front end generally wants `errno' maintained by math
561 operations, like built-in SQRT. */
563 int flag_errno_math
= 1;
565 /* Nonzero means that unsafe floating-point math optimizations are allowed
566 for the sake of speed. IEEE compliance is not guaranteed, and operations
567 are allowed to assume that their arguments and results are "normal"
568 (e.g., nonnegative for SQRT). */
570 int flag_unsafe_math_optimizations
= 0;
572 /* Zero means that floating-point math operations cannot generate a
573 (user-visible) trap. This is the case, for example, in nonstop
574 IEEE 754 arithmetic. */
576 int flag_trapping_math
= 1;
578 /* 0 means straightforward implementation of complex divide acceptable.
579 1 means wide ranges of inputs must work for complex divide.
580 2 means C99-like requirements for complex divide (not yet implemented). */
582 int flag_complex_divide_method
= 0;
584 /* Nonzero means all references through pointers are volatile. */
588 /* Nonzero means treat all global and extern variables as volatile. */
590 int flag_volatile_global
;
592 /* Nonzero means treat all static variables as volatile. */
594 int flag_volatile_static
;
596 /* Nonzero means just do syntax checking; don't output anything. */
598 int flag_syntax_only
= 0;
600 /* Nonzero means perform global cse. */
602 static int flag_gcse
;
604 /* Nonzero means perform loop optimizer. */
606 static int flag_loop_optimize
;
608 /* Nonzero means perform crossjumping. */
610 static int flag_crossjumping
;
612 /* Nonzero means perform if conversion. */
614 static int flag_if_conversion
;
616 /* Nonzero means perform if conversion after reload. */
618 static int flag_if_conversion2
;
620 /* Nonzero means to use global dataflow analysis to eliminate
621 useless null pointer tests. */
623 static int flag_delete_null_pointer_checks
;
625 /* Nonzero means to do the enhanced load motion during gcse, which trys
626 to hoist loads by not killing them when a store to the same location
629 int flag_gcse_lm
= 1;
631 /* Nonzero means to perform store motion after gcse, which will try to
632 move stores closer to the exit block. Its not very effective without
635 int flag_gcse_sm
= 1;
637 /* Nonzero means to rerun cse after loop optimization. This increases
638 compilation time about 20% and picks up a few more common expressions. */
640 static int flag_rerun_cse_after_loop
;
642 /* Nonzero means to run loop optimizations twice. */
644 int flag_rerun_loop_opt
;
646 /* Nonzero for -finline-functions: ok to inline functions that look like
647 good inline candidates. */
649 int flag_inline_functions
;
651 /* Nonzero for -fkeep-inline-functions: even if we make a function
652 go inline everywhere, keep its definition around for debugging
655 int flag_keep_inline_functions
;
657 /* Nonzero means that functions will not be inlined. */
659 int flag_no_inline
= 2;
661 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
662 not just because the tree inliner turned us off. */
664 int flag_really_no_inline
= 2;
666 /* Nonzero means that we should emit static const variables
667 regardless of whether or not optimization is turned on. */
669 int flag_keep_static_consts
= 1;
671 /* Nonzero means we should be saving declaration info into a .X file. */
673 int flag_gen_aux_info
= 0;
675 /* Specified name of aux-info file. */
677 static char *aux_info_file_name
;
679 /* Nonzero means make the text shared if supported. */
681 int flag_shared_data
;
683 /* Nonzero means schedule into delayed branch slots if supported. */
685 int flag_delayed_branch
;
687 /* Nonzero if we are compiling pure (sharable) code.
688 Value is 1 if we are doing "small" pic; value is 2 if we're doing
693 /* Set to the default thread-local storage (tls) model to use. */
695 enum tls_model flag_tls_default
;
697 /* Nonzero means generate extra code for exception handling and enable
698 exception handling. */
702 /* Nonzero means generate frame unwind info table when supported. */
704 int flag_unwind_tables
= 0;
706 /* Nonzero means generate frame unwind info table exact at each insn boundary */
708 int flag_asynchronous_unwind_tables
= 0;
710 /* Nonzero means don't place uninitialized global data in common storage
715 /* Nonzero means change certain warnings into errors.
716 Usually these are warnings about failure to conform to some standard. */
718 int flag_pedantic_errors
= 0;
720 /* flag_schedule_insns means schedule insns within basic blocks (before
722 flag_schedule_insns_after_reload means schedule insns after
725 int flag_schedule_insns
= 0;
726 int flag_schedule_insns_after_reload
= 0;
728 /* The following flags have effect only for scheduling before register
731 flag_schedule_interblock means schedule insns accross basic blocks.
732 flag_schedule_speculative means allow speculative motion of non-load insns.
733 flag_schedule_speculative_load means allow speculative motion of some
735 flag_schedule_speculative_load_dangerous allows speculative motion of more
738 int flag_schedule_interblock
= 1;
739 int flag_schedule_speculative
= 1;
740 int flag_schedule_speculative_load
= 0;
741 int flag_schedule_speculative_load_dangerous
= 0;
743 int flag_single_precision_constant
;
745 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
746 by a cheaper branch on a count register. */
747 int flag_branch_on_count_reg
= 1;
749 /* -finhibit-size-directive inhibits output of .size for ELF.
750 This is used only for compiling crtstuff.c,
751 and it may be extended to other effects
752 needed for crtstuff.c on other systems. */
753 int flag_inhibit_size_directive
= 0;
755 /* -fverbose-asm causes extra commentary information to be produced in
756 the generated assembly code (to make it more readable). This option
757 is generally only of use to those who actually need to read the
758 generated assembly code (perhaps while debugging the compiler itself).
759 -fno-verbose-asm, the default, causes the extra information
760 to be omitted and is useful when comparing two assembler files. */
762 int flag_verbose_asm
= 0;
764 /* -dA causes debug commentary information to be produced in
765 the generated assembly code (to make it more readable). This option
766 is generally only of use to those who actually need to read the
767 generated assembly code (perhaps while debugging the compiler itself).
768 Currently, this switch is only used by dwarfout.c; however, it is intended
769 to be a catchall for printing debug information in the assembler file. */
771 int flag_debug_asm
= 0;
773 /* -dP causes the rtl to be emitted as a comment in assembly. */
775 int flag_dump_rtl_in_asm
= 0;
777 /* -fgnu-linker specifies use of the GNU linker for initializations.
778 (Or, more generally, a linker that handles initializations.)
779 -fno-gnu-linker says that collect2 will be used. */
781 int flag_gnu_linker
= 0;
783 int flag_gnu_linker
= 1;
786 /* Nonzero means put zero initialized data in the bss section. */
787 int flag_zero_initialized_in_bss
= 1;
792 /* Enable ssa conditional constant propagation. */
793 int flag_ssa_ccp
= 0;
795 /* Enable ssa aggressive dead code elimination. */
796 int flag_ssa_dce
= 0;
798 /* Tag all structures with __attribute__(packed). */
799 int flag_pack_struct
= 0;
801 /* Emit code to check for stack overflow; also may cause large objects
802 to be allocated dynamically. */
803 int flag_stack_check
;
805 /* When non-NULL, indicates that whenever space is allocated on the
806 stack, the resulting stack pointer must not pass this
807 address---that is, for stacks that grow downward, the stack pointer
808 must always be greater than or equal to this address; for stacks
809 that grow upward, the stack pointer must be less than this address.
810 At present, the rtx may be either a REG or a SYMBOL_REF, although
811 the support provided depends on the backend. */
814 /* 0 if pointer arguments may alias each other. True in C.
815 1 if pointer arguments may not alias each other but may alias
817 2 if pointer arguments may not alias each other and may not
818 alias global variables. True in Fortran.
819 This defaults to 0 for C. */
820 int flag_argument_noalias
= 0;
822 /* Nonzero if we should do (language-dependent) alias analysis.
823 Typically, this analysis will assume that expressions of certain
824 types do not alias expressions of certain other types. Only used
825 if alias analysis (in general) is enabled. */
826 int flag_strict_aliasing
= 0;
828 /* Instrument functions with calls at entry and exit, for profiling. */
829 int flag_instrument_function_entry_exit
= 0;
831 /* Nonzero means ignore `#ident' directives. 0 means handle them.
832 On SVR4 targets, it also controls whether or not to emit a
833 string identifying the compiler. */
835 int flag_no_ident
= 0;
837 /* This will perform a peephole pass before sched2. */
838 int flag_peephole2
= 0;
840 /* This will try to guess branch probabilities. */
841 int flag_guess_branch_prob
= 0;
843 /* -fbounded-pointers causes gcc to compile pointers as composite
844 objects occupying three words: the pointer value, the base address
845 of the referent object, and the address immediately beyond the end
846 of the referent object. The base and extent allow us to perform
847 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
848 int flag_bounded_pointers
= 0;
850 /* -fcheck-bounds causes gcc to generate array bounds checks.
851 For C, C++: defaults to value of flag_bounded_pointers.
852 For ObjC: defaults to off.
853 For Java: defaults to on.
854 For Fortran: defaults to off.
855 For CHILL: defaults to off. */
856 int flag_bounds_check
= 0;
858 /* This will attempt to merge constant section constants, if 1 only
859 string constants and constants from constant pool, if 2 also constant
861 int flag_merge_constants
= 1;
863 /* If one, renumber instruction UIDs to reduce the number of
864 unused UIDs if there are a lot of instructions. If greater than
865 one, unconditionally renumber instruction UIDs. */
866 int flag_renumber_insns
= 1;
868 /* Values of the -falign-* flags: how much to align labels in code.
869 0 means `use default', 1 means `don't align'.
870 For each variable, there is an _log variant which is the power
871 of two not less than the variable, for .align output. */
875 int align_loops_max_skip
;
878 int align_jumps_max_skip
;
880 int align_labels_log
;
881 int align_labels_max_skip
;
883 int align_functions_log
;
885 /* Table of supported debugging formats. */
888 const char *const arg
;
889 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
890 constant expression, we use NO_DEBUG in its place. */
891 const enum debug_info_type debug_type
;
892 const int use_extensions_p
;
893 const char *const description
;
897 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
898 N_("Generate debugging info in default format") },
899 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
900 #ifdef DBX_DEBUGGING_INFO
901 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
902 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
904 #ifdef DWARF_DEBUGGING_INFO
905 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
906 { "dwarf+", DWARF_DEBUG
, 1,
907 N_("Generate extended DWARF-1 format debug info") },
909 #ifdef DWARF2_DEBUGGING_INFO
910 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
912 #ifdef XCOFF_DEBUGGING_INFO
913 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
914 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
916 #ifdef SDB_DEBUGGING_INFO
917 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
919 #ifdef VMS_DEBUGGING_INFO
920 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
927 const char *const string
;
930 const char *const description
;
932 lang_independent_options
;
936 /* Add or remove a leading underscore from user symbols. */
937 int flag_leading_underscore
= -1;
939 /* The user symbol prefix after having resolved same. */
940 const char *user_label_prefix
;
942 static const param_info lang_independent_params
[] = {
943 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
944 { OPTION, DEFAULT, HELP },
945 #include "params.def"
950 /* A default for same. */
951 #ifndef USER_LABEL_PREFIX
952 #define USER_LABEL_PREFIX ""
955 /* Table of language-independent -f options.
956 STRING is the option name. VARIABLE is the address of the variable.
957 ON_VALUE is the value to store in VARIABLE
958 if `-fSTRING' is seen as an option.
959 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
961 static const lang_independent_options f_options
[] =
963 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
964 N_("Perform DWARF2 duplicate elimination") },
965 {"float-store", &flag_float_store
, 1,
966 N_("Do not store floats in registers") },
967 {"volatile", &flag_volatile
, 1,
968 N_("Consider all mem refs through pointers as volatile") },
969 {"volatile-global", &flag_volatile_global
, 1,
970 N_("Consider all mem refs to global data to be volatile") },
971 {"volatile-static", &flag_volatile_static
, 1,
972 N_("Consider all mem refs to static data to be volatile") },
973 {"defer-pop", &flag_defer_pop
, 1,
974 N_("Defer popping functions args from stack until later") },
975 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
976 N_("When possible do not generate stack frames") },
977 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
978 N_("Optimize sibling and tail recursive calls") },
979 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
980 N_("When running CSE, follow jumps to their targets") },
981 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
982 N_("When running CSE, follow conditional jumps") },
983 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
984 N_("Perform a number of minor, expensive optimizations") },
985 {"thread-jumps", &flag_thread_jumps
, 1,
986 N_("Perform jump threading optimizations") },
987 {"strength-reduce", &flag_strength_reduce
, 1,
988 N_("Perform strength reduction optimizations") },
989 {"unroll-loops", &flag_unroll_loops
, 1,
990 N_("Perform loop unrolling when iteration count is known") },
991 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
992 N_("Perform loop unrolling for all loops") },
993 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
994 N_("Generate prefetch instructions, if available, for arrays in loops") },
995 {"move-all-movables", &flag_move_all_movables
, 1,
996 N_("Force all loop invariant computations out of loops") },
997 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
998 N_("Strength reduce all loop general induction variables") },
999 {"writable-strings", &flag_writable_strings
, 1,
1000 N_("Store strings in writable data section") },
1001 {"peephole", &flag_no_peephole
, 0,
1002 N_("Enable machine specific peephole optimizations") },
1003 {"force-mem", &flag_force_mem
, 1,
1004 N_("Copy memory operands into registers before using") },
1005 {"force-addr", &flag_force_addr
, 1,
1006 N_("Copy memory address constants into regs before using") },
1007 {"function-cse", &flag_no_function_cse
, 0,
1008 N_("Allow function addresses to be held in registers") },
1009 {"inline-functions", &flag_inline_functions
, 1,
1010 N_("Integrate simple functions into their callers") },
1011 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1012 N_("Generate code for funcs even if they are fully inlined") },
1013 {"inline", &flag_no_inline
, 0,
1014 N_("Pay attention to the 'inline' keyword") },
1015 {"keep-static-consts", &flag_keep_static_consts
, 1,
1016 N_("Emit static const variables even if they are not used") },
1017 {"syntax-only", &flag_syntax_only
, 1,
1018 N_("Check for syntax errors, then stop") },
1019 {"shared-data", &flag_shared_data
, 1,
1020 N_("Mark data as shared rather than private") },
1021 {"caller-saves", &flag_caller_saves
, 1,
1022 N_("Enable saving registers around function calls") },
1023 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1024 N_("Return 'short' aggregates in memory, not registers") },
1025 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1026 N_("Return 'short' aggregates in registers") },
1027 {"delayed-branch", &flag_delayed_branch
, 1,
1028 N_("Attempt to fill delay slots of branch instructions") },
1029 {"gcse", &flag_gcse
, 1,
1030 N_("Perform the global common subexpression elimination") },
1031 {"gcse-lm", &flag_gcse_lm
, 1,
1032 N_("Perform enhanced load motion during global subexpression elimination") },
1033 {"gcse-sm", &flag_gcse_sm
, 1,
1034 N_("Perform store motion after global subexpression elimination") },
1035 {"loop-optimize", &flag_loop_optimize
, 1,
1036 N_("Perform the loop optimizations") },
1037 {"crossjumping", &flag_crossjumping
, 1,
1038 N_("Perform cross-jumping optimization") },
1039 {"if-conversion", &flag_if_conversion
, 1,
1040 N_("Perform conversion of conditional jumps to branchless equivalents") },
1041 {"if-conversion2", &flag_if_conversion2
, 1,
1042 N_("Perform conversion of conditional jumps to conditional execution") },
1043 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1044 N_("Run CSE pass after loop optimizations") },
1045 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1046 N_("Run the loop optimizer twice") },
1047 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1048 N_("Delete useless null pointer checks") },
1049 {"schedule-insns", &flag_schedule_insns
, 1,
1050 N_("Reschedule instructions before register allocation") },
1051 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1052 N_("Reschedule instructions after register allocation") },
1053 {"sched-interblock",&flag_schedule_interblock
, 1,
1054 N_("Enable scheduling across basic blocks") },
1055 {"sched-spec",&flag_schedule_speculative
, 1,
1056 N_("Allow speculative motion of non-loads") },
1057 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1058 N_("Allow speculative motion of some loads") },
1059 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1060 N_("Allow speculative motion of more loads") },
1061 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1062 N_("Replace add,compare,branch with branch on count reg") },
1063 {"pic", &flag_pic
, 1,
1064 N_("Generate position independent code, if possible") },
1065 {"PIC", &flag_pic
, 2, ""},
1066 {"exceptions", &flag_exceptions
, 1,
1067 N_("Enable exception handling") },
1068 {"unwind-tables", &flag_unwind_tables
, 1,
1069 N_("Just generate unwind tables for exception handling") },
1070 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1071 N_("Generate unwind tables exact at each instruction boundary") },
1072 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1073 N_("Support synchronous non-call exceptions") },
1074 {"profile-arcs", &profile_arc_flag
, 1,
1075 N_("Insert arc based program profiling code") },
1076 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs
, 1,
1077 N_("Avoid thread safety profiling overhead") },
1078 {"test-coverage", &flag_test_coverage
, 1,
1079 N_("Create data files needed by gcov") },
1080 {"branch-probabilities", &flag_branch_probabilities
, 1,
1081 N_("Use profiling information for branch probabilities") },
1082 {"profile", &profile_flag
, 1,
1083 N_("Enable basic program profiling code") },
1084 {"reorder-blocks", &flag_reorder_blocks
, 1,
1085 N_("Reorder basic blocks to improve code placement") },
1086 {"reorder-functions", &flag_reorder_functions
, 1,
1087 N_("Reorder functions to improve code placement") },
1088 {"rename-registers", &flag_rename_registers
, 1,
1089 N_("Do the register renaming optimization pass") },
1090 {"cprop-registers", &flag_cprop_registers
, 1,
1091 N_("Do the register copy-propagation optimization pass") },
1092 {"common", &flag_no_common
, 0,
1093 N_("Do not put uninitialized globals in the common section") },
1094 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1095 N_("Do not generate .size directives") },
1096 {"function-sections", &flag_function_sections
, 1,
1097 N_("place each function into its own section") },
1098 {"data-sections", &flag_data_sections
, 1,
1099 N_("place data items into their own section") },
1100 {"verbose-asm", &flag_verbose_asm
, 1,
1101 N_("Add extra commentry to assembler output") },
1102 {"gnu-linker", &flag_gnu_linker
, 1,
1103 N_("Output GNU ld formatted global initializers") },
1104 {"regmove", &flag_regmove
, 1,
1105 N_("Enables a register move optimization") },
1106 {"optimize-register-move", &flag_regmove
, 1,
1107 N_("Do the full regmove optimization pass") },
1108 {"pack-struct", &flag_pack_struct
, 1,
1109 N_("Pack structure members together without holes") },
1110 {"stack-check", &flag_stack_check
, 1,
1111 N_("Insert stack checking code into the program") },
1112 {"argument-alias", &flag_argument_noalias
, 0,
1113 N_("Specify that arguments may alias each other & globals") },
1114 {"argument-noalias", &flag_argument_noalias
, 1,
1115 N_("Assume arguments may alias globals but not each other") },
1116 {"argument-noalias-global", &flag_argument_noalias
, 2,
1117 N_("Assume arguments do not alias each other or globals") },
1118 {"strict-aliasing", &flag_strict_aliasing
, 1,
1119 N_("Assume strict aliasing rules apply") },
1120 {"align-loops", &align_loops
, 0,
1121 N_("Align the start of loops") },
1122 {"align-jumps", &align_jumps
, 0,
1123 N_("Align labels which are only reached by jumping") },
1124 {"align-labels", &align_labels
, 0,
1125 N_("Align all labels") },
1126 {"align-functions", &align_functions
, 0,
1127 N_("Align the start of functions") },
1128 {"merge-constants", &flag_merge_constants
, 1,
1129 N_("Attempt to merge identical constants accross compilation units") },
1130 {"merge-all-constants", &flag_merge_constants
, 2,
1131 N_("Attempt to merge identical constants and constant variables") },
1132 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1133 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1134 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1135 N_("Instrument function entry/exit with profiling calls") },
1136 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1,
1137 N_("Put zero initialized data in the bss section") },
1138 {"ssa", &flag_ssa
, 1,
1139 N_("Enable SSA optimizations") },
1140 {"ssa-ccp", &flag_ssa_ccp
, 1,
1141 N_("Enable SSA conditional constant propagation") },
1142 {"ssa-dce", &flag_ssa_dce
, 1,
1143 N_("Enable aggressive SSA dead code elimination") },
1144 {"leading-underscore", &flag_leading_underscore
, 1,
1145 N_("External symbols have a leading underscore") },
1146 {"ident", &flag_no_ident
, 0,
1147 N_("Process #ident directives") },
1148 { "peephole2", &flag_peephole2
, 1,
1149 N_("Enables an rtl peephole pass run before sched2") },
1150 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1151 N_("Enables guessing of branch probabilities") },
1152 {"math-errno", &flag_errno_math
, 1,
1153 N_("Set errno after built-in math functions") },
1154 {"trapping-math", &flag_trapping_math
, 1,
1155 N_("Floating-point operations can trap") },
1156 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1157 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1158 {"bounded-pointers", &flag_bounded_pointers
, 1,
1159 N_("Compile pointers as triples: value, base & end") },
1160 {"bounds-check", &flag_bounds_check
, 1,
1161 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1162 {"single-precision-constant", &flag_single_precision_constant
, 1,
1163 N_("Convert floating point constant to single precision constant") },
1164 {"time-report", &time_report
, 1,
1165 N_("Report time taken by each compiler pass at end of run") },
1166 {"mem-report", &mem_report
, 1,
1167 N_("Report on permanent memory allocation at end of run") },
1168 { "trapv", &flag_trapv
, 1,
1169 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1172 /* Table of language-specific options. */
1174 static const struct lang_opt
1176 const char *const option
;
1177 const char *const description
;
1179 documented_lang_options
[] =
1181 /* In order not to overload the --help output, the convention
1182 used here is to only describe those options which are not
1183 enabled by default. */
1186 N_("Compile just for ISO C89") },
1188 N_("Determine language standard") },
1190 { "-fsigned-bitfields", "" },
1191 { "-funsigned-bitfields",
1192 N_("Make bit-fields by unsigned by default") },
1193 { "-fno-signed-bitfields", "" },
1194 { "-fno-unsigned-bitfields","" },
1196 N_("Make 'char' be signed by default") },
1197 { "-funsigned-char",
1198 N_("Make 'char' be unsigned by default") },
1199 { "-fno-signed-char", "" },
1200 { "-fno-unsigned-char", "" },
1204 N_("Do not recognize the 'asm' keyword") },
1205 { "-fbuiltin", "" },
1207 N_("Do not recognize any built in functions") },
1209 N_("Assume normal C execution environment") },
1210 { "-fno-hosted", "" },
1212 N_("Assume that standard libraries & main might not exist") },
1213 { "-fno-freestanding", "" },
1214 { "-fcond-mismatch",
1215 N_("Allow different types as args of ? operator") },
1216 { "-fno-cond-mismatch", "" },
1217 { "-fdollars-in-identifiers",
1218 N_("Allow the use of $ inside identifiers") },
1219 { "-fno-dollars-in-identifiers", "" },
1220 { "-fpreprocessed", "" },
1221 { "-fno-preprocessed", "" },
1223 N_("Use the same size for double as for float") },
1224 { "-fno-short-double", "" },
1226 N_("Use the smallest fitting integer to hold enums") },
1227 { "-fno-short-enums", "" },
1229 N_("Override the underlying type for wchar_t to `unsigned short'") },
1230 { "-fno-short-wchar", "" },
1233 N_("Enable most warning messages") },
1234 { "-Wbad-function-cast",
1235 N_("Warn about casting functions to incompatible types") },
1236 { "-Wno-bad-function-cast", "" },
1237 { "-Wmissing-format-attribute",
1238 N_("Warn about functions which might be candidates for format attributes") },
1239 { "-Wno-missing-format-attribute", "" },
1241 N_("Warn about casts which discard qualifiers") },
1242 { "-Wno-cast-qual", "" },
1243 { "-Wchar-subscripts",
1244 N_("Warn about subscripts whose type is 'char'") },
1245 { "-Wno-char-subscripts", "" },
1247 N_("Warn if nested comments are detected") },
1248 { "-Wno-comment", "" },
1250 N_("Warn if nested comments are detected") },
1251 { "-Wno-comments", "" },
1253 N_("Warn about possibly confusing type conversions") },
1254 { "-Wno-conversion", "" },
1255 { "-Wdiv-by-zero", "" },
1256 { "-Wno-div-by-zero",
1257 N_("Do not warn about compile-time integer division by zero") },
1259 N_("Warn about testing equality of floating point numbers") },
1260 { "-Wno-float-equal", "" },
1262 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1263 { "-Wno-format", "" },
1264 { "-Wformat-extra-args", "" },
1265 { "-Wno-format-extra-args",
1266 N_("Don't warn about too many arguments to format functions") },
1267 { "-Wformat-nonliteral",
1268 N_("Warn about non-string-literal format strings") },
1269 { "-Wno-format-nonliteral", "" },
1270 { "-Wformat-security",
1271 N_("Warn about possible security problems with format functions") },
1272 { "-Wno-format-security", "" },
1273 { "-Wformat-y2k", "" },
1274 { "-Wno-format-y2k",
1275 N_("Don't warn about strftime formats yielding 2 digit years") },
1276 { "-Wimplicit-function-declaration",
1277 N_("Warn about implicit function declarations") },
1278 { "-Wno-implicit-function-declaration", "" },
1279 { "-Werror-implicit-function-declaration", "" },
1281 N_("Warn when a declaration does not specify a type") },
1282 { "-Wno-implicit-int", "" },
1283 { "-Wimplicit", "" },
1284 { "-Wno-implicit", "" },
1286 N_("Warn about the use of the #import directive") },
1287 { "-Wno-import", "" },
1288 { "-Wlong-long","" },
1290 N_("Do not warn about using 'long long' when -pedantic") },
1292 N_("Warn about suspicious declarations of main") },
1293 { "-Wno-main", "" },
1294 { "-Wmissing-braces",
1295 N_("Warn about possibly missing braces around initializers") },
1296 { "-Wno-missing-braces", "" },
1297 { "-Wmissing-declarations",
1298 N_("Warn about global funcs without previous declarations") },
1299 { "-Wno-missing-declarations", "" },
1300 { "-Wmissing-prototypes",
1301 N_("Warn about global funcs without prototypes") },
1302 { "-Wno-missing-prototypes", "" },
1304 N_("Warn about use of multicharacter literals") },
1305 { "-Wno-multichar", "" },
1306 { "-Wnested-externs",
1307 N_("Warn about externs not at file scope level") },
1308 { "-Wno-nested-externs", "" },
1310 N_("Warn about possible missing parentheses") },
1311 { "-Wno-parentheses", "" },
1312 { "-Wpointer-arith",
1313 N_("Warn about function pointer arithmetic") },
1314 { "-Wno-pointer-arith", "" },
1315 { "-Wredundant-decls",
1316 N_("Warn about multiple declarations of the same object") },
1317 { "-Wno-redundant-decls", "" },
1319 N_("Warn whenever a function's return-type defaults to int") },
1320 { "-Wno-return-type", "" },
1321 { "-Wsequence-point",
1322 N_("Warn about possible violations of sequence point rules") },
1323 { "-Wno-sequence-point", "" },
1325 N_("Warn about signed/unsigned comparisons") },
1326 { "-Wno-sign-compare", "" },
1327 { "-Wstrict-prototypes",
1328 N_("Warn about non-prototyped function decls") },
1329 { "-Wno-strict-prototypes", "" },
1331 N_("Warn about constructs whose meanings change in ISO C") },
1332 { "-Wno-traditional", "" },
1334 N_("Warn when trigraphs are encountered") },
1335 { "-Wno-trigraphs", "" },
1337 { "-Wno-undef", "" },
1338 { "-Wunknown-pragmas",
1339 N_("Warn about unrecognized pragmas") },
1340 { "-Wno-unknown-pragmas", "" },
1341 { "-Wwrite-strings",
1342 N_("Mark strings as 'const char *'") },
1343 { "-Wno-write-strings", "" },
1345 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1347 #include "options.h"
1351 /* Here is a table, controlled by the tm.h file, listing each -m switch
1352 and which bits in `target_switches' it should set or clear.
1353 If VALUE is positive, it is bits to set.
1354 If VALUE is negative, -VALUE is bits to clear.
1355 (The sign bit is not used so there is no confusion.) */
1359 const char *const name
;
1361 const char *const description
;
1363 target_switches
[] = TARGET_SWITCHES
;
1365 /* This table is similar, but allows the switch to have a value. */
1367 #ifdef TARGET_OPTIONS
1370 const char *const prefix
;
1371 const char **const variable
;
1372 const char *const description
;
1374 target_options
[] = TARGET_OPTIONS
;
1377 /* Options controlling warnings. */
1379 /* Don't print warning messages. -w. */
1381 int inhibit_warnings
= 0;
1383 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1385 int warn_system_headers
= 0;
1387 /* Print various extra warnings. -W. */
1389 int extra_warnings
= 0;
1391 /* Treat warnings as errors. -Werror. */
1393 int warnings_are_errors
= 0;
1395 /* Nonzero to warn about unused variables, functions et.al. */
1397 int warn_unused_function
;
1398 int warn_unused_label
;
1399 int warn_unused_parameter
;
1400 int warn_unused_variable
;
1401 int warn_unused_value
;
1403 /* Nonzero to warn about code which is never reached. */
1405 int warn_notreached
;
1407 /* Nonzero to warn about variables used before they are initialized. */
1409 int warn_uninitialized
;
1411 /* Nonzero means warn about all declarations which shadow others. */
1415 /* Warn if a switch on an enum, that does not have a default case,
1416 fails to have a case for every enum value. */
1420 /* Warn if a switch does not have a default case. */
1422 int warn_switch_default
;
1424 /* Warn if a switch on an enum fails to have a case for every enum
1425 value (regardless of the presence or otherwise of a default case). */
1427 int warn_switch_enum
;
1429 /* Nonzero means warn about function definitions that default the return type
1430 or that use a null return and have a return-type other than void. */
1432 int warn_return_type
;
1434 /* Nonzero means warn about pointer casts that increase the required
1435 alignment of the target type (and might therefore lead to a crash
1436 due to a misaligned access). */
1438 int warn_cast_align
;
1440 /* Nonzero means warn about any objects definitions whose size is larger
1441 than N bytes. Also want about function definitions whose returned
1442 values are larger than N bytes. The value N is in `larger_than_size'. */
1444 int warn_larger_than
;
1445 HOST_WIDE_INT larger_than_size
;
1447 /* Nonzero means warn if inline function is too large. */
1451 /* Warn if a function returns an aggregate,
1452 since there are often incompatible calling conventions for doing this. */
1454 int warn_aggregate_return
;
1456 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1460 /* Warn when gcc pads a structure to an alignment boundary. */
1464 /* Warn when an optimization pass is disabled. */
1466 int warn_disabled_optimization
;
1468 /* Warn about functions which might be candidates for attribute noreturn. */
1470 int warn_missing_noreturn
;
1472 /* Nonzero means warn about uses of __attribute__((deprecated))
1475 int warn_deprecated_decl
= 1;
1477 /* Likewise for -W. */
1479 static const lang_independent_options W_options
[] =
1481 {"unused-function", &warn_unused_function
, 1,
1482 N_("Warn when a function is unused") },
1483 {"unused-label", &warn_unused_label
, 1,
1484 N_("Warn when a label is unused") },
1485 {"unused-parameter", &warn_unused_parameter
, 1,
1486 N_("Warn when a function parameter is unused") },
1487 {"unused-variable", &warn_unused_variable
, 1,
1488 N_("Warn when a variable is unused") },
1489 {"unused-value", &warn_unused_value
, 1,
1490 N_("Warn when an expression value is unused") },
1491 {"system-headers", &warn_system_headers
, 1,
1492 N_("Do not suppress warnings from system headers") },
1493 {"error", &warnings_are_errors
, 1,
1494 N_("Treat all warnings as errors") },
1495 {"shadow", &warn_shadow
, 1,
1496 N_("Warn when one local variable shadows another") },
1497 {"switch", &warn_switch
, 1,
1498 N_("Warn about enumerated switches, with no default, missing a case") },
1499 {"switch-default", &warn_switch_default
, 1,
1500 N_("Warn about enumerated switches missing a default case") },
1501 {"switch-enum", &warn_switch_enum
, 1,
1502 N_("Warn about all enumerated switches missing a specific case") },
1503 {"aggregate-return", &warn_aggregate_return
, 1,
1504 N_("Warn about returning structures, unions or arrays") },
1505 {"cast-align", &warn_cast_align
, 1,
1506 N_("Warn about pointer casts which increase alignment") },
1507 {"unreachable-code", &warn_notreached
, 1,
1508 N_("Warn about code that will never be executed") },
1509 {"uninitialized", &warn_uninitialized
, 1,
1510 N_("Warn about uninitialized automatic variables") },
1511 {"inline", &warn_inline
, 1,
1512 N_("Warn when an inlined function cannot be inlined") },
1513 {"packed", &warn_packed
, 1,
1514 N_("Warn when the packed attribute has no effect on struct layout") },
1515 {"padded", &warn_padded
, 1,
1516 N_("Warn when padding is required to align struct members") },
1517 {"disabled-optimization", &warn_disabled_optimization
, 1,
1518 N_("Warn when an optimization pass is disabled") },
1519 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1520 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1521 {"missing-noreturn", &warn_missing_noreturn
, 1,
1522 N_("Warn about functions which might be candidates for attribute noreturn") }
1526 set_Wunused (setting
)
1529 warn_unused_function
= setting
;
1530 warn_unused_label
= setting
;
1531 /* Unused function parameter warnings are reported when either ``-W
1532 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1533 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1535 warn_unused_parameter
= 0;
1536 else if (!warn_unused_parameter
)
1537 warn_unused_parameter
= -1;
1538 warn_unused_variable
= setting
;
1539 warn_unused_value
= setting
;
1542 /* The following routines are useful in setting all the flags that
1543 -ffast-math and -fno-fast-math imply. */
1546 set_fast_math_flags (int set
)
1548 flag_trapping_math
= !set
;
1549 flag_unsafe_math_optimizations
= set
;
1550 flag_errno_math
= !set
;
1553 /* Return true iff flags are set as if -ffast-math. */
1555 fast_math_flags_set_p ()
1557 return (!flag_trapping_math
1558 && flag_unsafe_math_optimizations
1559 && !flag_errno_math
);
1563 /* Output files for assembler code (real compiler output)
1564 and debugging dumps. */
1567 FILE *aux_info_file
;
1568 FILE *rtl_dump_file
= NULL
;
1570 /* Decode the string P as an integral parameter.
1571 If the string is indeed an integer return its numeric value else
1572 issue an Invalid Option error for the option PNAME and return DEFVAL.
1573 If PNAME is zero just return DEFVAL, do not call error. */
1576 read_integral_parameter (p
, pname
, defval
)
1581 const char *endp
= p
;
1585 if (ISDIGIT (*endp
))
1594 error ("invalid option `%s'", pname
);
1601 /* This calls abort and is used to avoid problems when abort if a macro.
1602 It is used when we need to pass the address of abort. */
1610 /* When `malloc.c' is compiled with `rcheck' defined,
1611 it calls this function to report clobberage. */
1615 const char *s ATTRIBUTE_UNUSED
;
1620 /* Return the logarithm of X, base 2, considering X unsigned,
1621 if X is a power of 2. Otherwise, returns -1.
1623 This should be used via the `exact_log2' macro. */
1627 unsigned HOST_WIDE_INT x
;
1630 /* Test for 0 or a power of 2. */
1631 if (x
== 0 || x
!= (x
& -x
))
1633 while ((x
>>= 1) != 0)
1638 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1639 If X is 0, return -1.
1641 This should be used via the floor_log2 macro. */
1645 unsigned HOST_WIDE_INT x
;
1654 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1655 into ICE messages, which is much more user friendly. */
1658 crash_signal (signo
)
1661 internal_error ("internal error: %s", strsignal (signo
));
1664 /* Strip off a legitimate source ending from the input string NAME of
1665 length LEN. Rather than having to know the names used by all of
1666 our front ends, we strip off an ending of a period followed by
1667 up to five characters. (Java uses ".class".) */
1670 strip_off_ending (name
, len
)
1675 for (i
= 2; i
< 6 && len
> i
; i
++)
1677 if (name
[len
- i
] == '.')
1679 name
[len
- i
] = '\0';
1685 /* Output a quoted string. */
1688 output_quoted_string (asm_file
, string
)
1692 #ifdef OUTPUT_QUOTED_STRING
1693 OUTPUT_QUOTED_STRING (asm_file
, string
);
1697 putc ('\"', asm_file
);
1698 while ((c
= *string
++) != 0)
1702 if (c
== '\"' || c
== '\\')
1703 putc ('\\', asm_file
);
1707 fprintf (asm_file
, "\\%03o", c
);
1709 putc ('\"', asm_file
);
1713 /* Output a file name in the form wanted by System V. */
1716 output_file_directive (asm_file
, input_name
)
1718 const char *input_name
;
1720 int len
= strlen (input_name
);
1721 const char *na
= input_name
+ len
;
1723 /* NA gets INPUT_NAME sans directory names. */
1724 while (na
> input_name
)
1726 if (IS_DIR_SEPARATOR (na
[-1]))
1731 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1732 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1734 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1735 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1737 fprintf (asm_file
, "\t.file\t");
1738 output_quoted_string (asm_file
, na
);
1739 fputc ('\n', asm_file
);
1744 /* Routine to open a dump file. Return true if the dump file is enabled. */
1747 open_dump_file (index
, decl
)
1748 enum dump_file_index index
;
1752 const char *open_arg
;
1755 if (! dump_file
[index
].enabled
)
1758 timevar_push (TV_DUMP
);
1759 if (rtl_dump_file
!= NULL
)
1760 fclose (rtl_dump_file
);
1762 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1764 if (! dump_file
[index
].initialized
)
1766 /* If we've not initialized the files, do so now. */
1767 if (graph_dump_format
!= no_graph
1768 && dump_file
[index
].graph_dump_p
)
1770 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1771 clean_graph_dump_file (dump_base_name
, dump_name
);
1774 dump_file
[index
].initialized
= 1;
1780 dump_name
= concat (dump_base_name
, seq
,
1781 dump_file
[index
].extension
, NULL
);
1783 rtl_dump_file
= fopen (dump_name
, open_arg
);
1784 if (rtl_dump_file
== NULL
)
1785 fatal_io_error ("can't open %s", dump_name
);
1790 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1791 (*lang_hooks
.decl_printable_name
) (decl
, 2));
1793 timevar_pop (TV_DUMP
);
1797 /* Routine to close a dump file. */
1800 close_dump_file (index
, func
, insns
)
1801 enum dump_file_index index
;
1802 void (*func
) PARAMS ((FILE *, rtx
));
1805 if (! rtl_dump_file
)
1808 timevar_push (TV_DUMP
);
1810 && graph_dump_format
!= no_graph
1811 && dump_file
[index
].graph_dump_p
)
1816 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1817 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1818 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1823 func (rtl_dump_file
, insns
);
1825 fflush (rtl_dump_file
);
1826 fclose (rtl_dump_file
);
1828 rtl_dump_file
= NULL
;
1829 timevar_pop (TV_DUMP
);
1832 /* Do any final processing required for the declarations in VEC, of
1833 which there are LEN. We write out inline functions and variables
1834 that have been deferred until this point, but which are required.
1835 Returns non-zero if anything was put out. */
1838 wrapup_global_declarations (vec
, len
)
1845 int output_something
= 0;
1847 for (i
= 0; i
< len
; i
++)
1851 /* We're not deferring this any longer. */
1852 DECL_DEFER_OUTPUT (decl
) = 0;
1854 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1855 (*lang_hooks
.finish_incomplete_decl
) (decl
);
1858 /* Now emit any global variables or functions that we have been
1859 putting off. We need to loop in case one of the things emitted
1860 here references another one which comes earlier in the list. */
1864 for (i
= 0; i
< len
; i
++)
1868 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1871 /* Don't write out static consts, unless we still need them.
1873 We also keep static consts if not optimizing (for debugging),
1874 unless the user specified -fno-keep-static-consts.
1875 ??? They might be better written into the debug information.
1876 This is possible when using DWARF.
1878 A language processor that wants static constants to be always
1879 written out (even if it is not used) is responsible for
1880 calling rest_of_decl_compilation itself. E.g. the C front-end
1881 calls rest_of_decl_compilation from finish_decl.
1882 One motivation for this is that is conventional in some
1883 environments to write things like:
1884 static const char rcsid[] = "... version string ...";
1885 intending to force the string to be in the executable.
1887 A language processor that would prefer to have unneeded
1888 static constants "optimized away" would just defer writing
1889 them out until here. E.g. C++ does this, because static
1890 constants are often defined in header files.
1892 ??? A tempting alternative (for both C and C++) would be
1893 to force a constant to be written if and only if it is
1894 defined in a main file, as opposed to an include file. */
1896 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1900 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1902 else if (DECL_COMDAT (decl
))
1904 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1905 && (optimize
|| !flag_keep_static_consts
1906 || DECL_ARTIFICIAL (decl
)))
1912 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1916 if (TREE_CODE (decl
) == FUNCTION_DECL
1917 && DECL_INITIAL (decl
) != 0
1918 && DECL_SAVED_INSNS (decl
) != 0
1919 && (flag_keep_inline_functions
1920 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1921 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1924 output_inline_function (decl
);
1929 output_something
= 1;
1933 return output_something
;
1936 /* Issue appropriate warnings for the global declarations in VEC (of
1937 which there are LEN). Output debugging information for them. */
1940 check_global_declarations (vec
, len
)
1947 for (i
= 0; i
< len
; i
++)
1951 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1952 && ! TREE_ASM_WRITTEN (decl
))
1953 /* Cancel the RTL for this decl so that, if debugging info
1954 output for global variables is still to come,
1955 this one will be omitted. */
1956 SET_DECL_RTL (decl
, NULL_RTX
);
1958 /* Warn about any function
1959 declared static but not defined.
1960 We don't warn about variables,
1961 because many programs have static variables
1962 that exist only to get some text into the object file. */
1963 if (TREE_CODE (decl
) == FUNCTION_DECL
1964 && (warn_unused_function
1965 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1966 && DECL_INITIAL (decl
) == 0
1967 && DECL_EXTERNAL (decl
)
1968 && ! DECL_ARTIFICIAL (decl
)
1969 && ! TREE_PUBLIC (decl
))
1971 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1972 pedwarn_with_decl (decl
,
1973 "`%s' used but never defined");
1975 warning_with_decl (decl
,
1976 "`%s' declared `static' but never defined");
1977 /* This symbol is effectively an "extern" declaration now. */
1978 TREE_PUBLIC (decl
) = 1;
1979 assemble_external (decl
);
1982 /* Warn about static fns or vars defined but not used. */
1983 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
1984 || (warn_unused_variable
&& TREE_CODE (decl
) == VAR_DECL
))
1985 && ! TREE_USED (decl
)
1986 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1987 to handle multiple external decls in different scopes. */
1988 && ! TREE_USED (DECL_NAME (decl
))
1989 && ! DECL_EXTERNAL (decl
)
1990 && ! TREE_PUBLIC (decl
)
1991 /* Global register variables must be declared to reserve them. */
1992 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
1993 /* Otherwise, ask the language. */
1994 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
1995 warning_with_decl (decl
, "`%s' defined but not used");
1997 timevar_push (TV_SYMOUT
);
1998 (*debug_hooks
->global_decl
) (decl
);
1999 timevar_pop (TV_SYMOUT
);
2003 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2004 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2005 INPUT_FILENAME and LINENO accordingly. */
2008 push_srcloc (file
, line
)
2012 struct file_stack
*fs
;
2014 if (input_file_stack
)
2016 input_file_stack
->name
= input_filename
;
2017 input_file_stack
->line
= lineno
;
2020 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2021 fs
->name
= input_filename
= file
;
2022 fs
->line
= lineno
= line
;
2023 fs
->indent_level
= 0;
2024 fs
->next
= input_file_stack
;
2025 input_file_stack
= fs
;
2026 input_file_stack_tick
++;
2029 /* Pop the top entry off the stack of presently open source files.
2030 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2036 struct file_stack
*fs
;
2038 fs
= input_file_stack
;
2039 input_file_stack
= fs
->next
;
2041 input_file_stack_tick
++;
2042 /* The initial source file is never popped. */
2043 if (!input_file_stack
)
2045 input_filename
= input_file_stack
->name
;
2046 lineno
= input_file_stack
->line
;
2049 /* Compile an entire translation unit. Write a file of assembly
2050 output and various debugging dumps. */
2057 /* Initialize yet another pass. */
2059 init_final (main_input_filename
);
2060 init_branch_prob (dump_base_name
);
2062 timevar_push (TV_PARSE
);
2064 /* Call the parser, which parses the entire file (calling
2065 rest_of_compilation for each function). */
2066 (*lang_hooks
.parse_file
) (set_yydebug
);
2068 /* In case there were missing block closers,
2069 get us back to the global binding level. */
2070 (*lang_hooks
.clear_binding_stack
) ();
2072 /* Compilation is now finished except for writing
2073 what's left of the symbol table output. */
2074 timevar_pop (TV_PARSE
);
2076 if (flag_syntax_only
)
2079 globals
= (*lang_hooks
.decls
.getdecls
) ();
2081 /* Really define vars that have had only a tentative definition.
2082 Really output inline functions that must actually be callable
2083 and have not been output so far. */
2086 int len
= list_length (globals
);
2087 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2091 /* Process the decls in reverse order--earliest first.
2092 Put them into VEC from back to front, then take out from front. */
2094 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2095 vec
[len
- i
- 1] = decl
;
2097 wrapup_global_declarations (vec
, len
);
2099 /* This must occur after the loop to output deferred functions. Else
2100 the profiler initializer would not be emitted if all the functions
2101 in this compilation unit were deferred.
2103 output_func_start_profiler can not cause any additional functions or
2104 data to need to be output, so it need not be in the deferred function
2106 output_func_start_profiler ();
2108 check_global_declarations (vec
, len
);
2114 /* Write out any pending weak symbol declarations. */
2118 /* Do dbx symbols. */
2119 timevar_push (TV_SYMOUT
);
2121 #ifdef DWARF2_UNWIND_INFO
2122 if (dwarf2out_do_frame ())
2123 dwarf2out_frame_finish ();
2126 (*debug_hooks
->finish
) (main_input_filename
);
2127 timevar_pop (TV_SYMOUT
);
2129 /* Output some stuff at end of file if nec. */
2131 dw2_output_indirect_constants ();
2133 end_final (dump_base_name
);
2135 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2137 timevar_push (TV_DUMP
);
2138 open_dump_file (DFI_bp
, NULL
);
2142 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2143 timevar_pop (TV_DUMP
);
2147 ASM_FILE_END (asm_out_file
);
2150 /* Attach a special .ident directive to the end of the file to identify
2151 the version of GCC which compiled this code. The format of the .ident
2152 string is patterned after the ones produced by native SVR4 compilers. */
2155 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2156 IDENT_ASM_OP
, version_string
);
2159 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2161 timevar_push (TV_DUMP
);
2162 dump_combine_total_stats (rtl_dump_file
);
2163 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2164 timevar_pop (TV_DUMP
);
2168 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2169 and TYPE_DECL nodes.
2171 This does nothing for local (non-static) variables, unless the
2172 variable is a register variable with an ASMSPEC. In that case, or
2173 if the variable is not an automatic, it sets up the RTL and
2174 outputs any assembler code (label definition, storage allocation
2175 and initialization).
2177 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2178 the assembler symbol name to be used. TOP_LEVEL is nonzero
2179 if this declaration is not within a function. */
2182 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2184 const char *asmspec
;
2188 /* Declarations of variables, and of functions defined elsewhere. */
2190 /* The most obvious approach, to put an #ifndef around where
2191 this macro is used, doesn't work since it's inside a macro call. */
2192 #ifndef ASM_FINISH_DECLARE_OBJECT
2193 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2196 /* We deferred calling assemble_alias so that we could collect
2197 other attributes such as visibility. Emit the alias now. */
2200 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2203 alias
= TREE_VALUE (TREE_VALUE (alias
));
2204 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2205 assemble_alias (decl
, alias
);
2209 /* Forward declarations for nested functions are not "external",
2210 but we need to treat them as if they were. */
2211 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2212 || TREE_CODE (decl
) == FUNCTION_DECL
)
2214 timevar_push (TV_VARCONST
);
2217 make_decl_rtl (decl
, asmspec
);
2219 /* Don't output anything when a tentative file-scope definition
2220 is seen. But at end of compilation, do output code for them. */
2221 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2222 assemble_variable (decl
, top_level
, at_end
, 0);
2223 if (decl
== last_assemble_variable_decl
)
2225 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2229 timevar_pop (TV_VARCONST
);
2231 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2233 if (decode_reg_name (asmspec
) >= 0)
2235 SET_DECL_RTL (decl
, NULL_RTX
);
2236 make_decl_rtl (decl
, asmspec
);
2240 error ("invalid register name `%s' for register variable", asmspec
);
2241 DECL_REGISTER (decl
) = 0;
2246 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2247 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2248 && TREE_CODE (decl
) == TYPE_DECL
)
2250 timevar_push (TV_SYMOUT
);
2251 dbxout_symbol (decl
, 0);
2252 timevar_pop (TV_SYMOUT
);
2255 #ifdef SDB_DEBUGGING_INFO
2256 else if (write_symbols
== SDB_DEBUG
&& top_level
2257 && TREE_CODE (decl
) == TYPE_DECL
)
2259 timevar_push (TV_SYMOUT
);
2260 sdbout_symbol (decl
, 0);
2261 timevar_pop (TV_SYMOUT
);
2266 /* Called after finishing a record, union or enumeral type. */
2269 rest_of_type_compilation (type
, toplev
)
2270 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2274 tree type ATTRIBUTE_UNUSED
;
2275 int toplev ATTRIBUTE_UNUSED
;
2278 timevar_push (TV_SYMOUT
);
2279 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2280 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2281 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2283 #ifdef SDB_DEBUGGING_INFO
2284 if (write_symbols
== SDB_DEBUG
)
2285 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2287 #ifdef DWARF2_DEBUGGING_INFO
2288 if ((write_symbols
== DWARF2_DEBUG
2289 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2291 dwarf2out_decl (TYPE_STUB_DECL (type
));
2293 timevar_pop (TV_SYMOUT
);
2296 /* This is called from finish_function (within langhooks.parse_file)
2297 after each top-level definition is parsed.
2298 It is supposed to compile that function or variable
2299 and output the assembler code for it.
2300 After we return, the tree storage is freed. */
2303 rest_of_compilation (decl
)
2309 int rebuild_label_notes_after_reload
;
2310 int register_life_up_to_date
;
2312 timevar_push (TV_REST_OF_COMPILATION
);
2314 /* Now that we're out of the frontend, we shouldn't have any more
2315 CONCATs anywhere. */
2316 generating_concat_p
= 0;
2318 /* When processing delayed functions, prepare_function_start() won't
2319 have been run to re-initialize it. */
2320 cse_not_expected
= ! optimize
;
2322 /* First, make sure that NOTE_BLOCK is set correctly for each
2323 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2324 if (!cfun
->x_whole_function_mode_p
)
2327 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2328 tree in sensible shape. So, we just recalculate it here. */
2329 if (cfun
->x_whole_function_mode_p
)
2334 /* If we are reconsidering an inline function
2335 at the end of compilation, skip the stuff for making it inline. */
2337 if (DECL_SAVED_INSNS (decl
) == 0)
2343 /* If this is nested inside an inlined external function, pretend
2344 it was only declared. Since we cannot inline such functions,
2345 generating code for this one is not only not necessary but will
2346 confuse some debugging output writers. */
2347 for (parent
= DECL_CONTEXT (current_function_decl
);
2348 parent
!= NULL_TREE
;
2349 parent
= get_containing_scope (parent
))
2350 if (TREE_CODE (parent
) == FUNCTION_DECL
2351 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2353 DECL_INITIAL (decl
) = 0;
2354 goto exit_rest_of_compilation
;
2357 /* If requested, consider whether to make this function inline. */
2358 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2359 || flag_inline_functions
)
2361 timevar_push (TV_INTEGRATION
);
2362 lose
= function_cannot_inline_p (decl
);
2363 timevar_pop (TV_INTEGRATION
);
2364 if (lose
|| ! optimize
)
2366 if (warn_inline
&& DECL_INLINE (decl
))
2367 warning_with_decl (decl
, lose
);
2368 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2369 /* Don't really compile an extern inline function.
2370 If we can't make it inline, pretend
2371 it was only declared. */
2372 if (DECL_EXTERNAL (decl
))
2374 DECL_INITIAL (decl
) = 0;
2375 goto exit_rest_of_compilation
;
2379 /* ??? Note that this has the effect of making it look
2380 like "inline" was specified for a function if we choose
2381 to inline it. This isn't quite right, but it's
2382 probably not worth the trouble to fix. */
2383 inlinable
= DECL_INLINE (decl
) = 1;
2386 insns
= get_insns ();
2388 /* Dump the rtl code if we are dumping rtl. */
2390 if (open_dump_file (DFI_rtl
, decl
))
2392 if (DECL_SAVED_INSNS (decl
))
2393 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2394 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2397 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2398 sorts of eh initialization. Delay this until after the
2399 initial rtl dump so that we can see the original nesting. */
2400 convert_from_eh_region_ranges ();
2402 /* If function is inline, and we don't yet know whether to
2403 compile it by itself, defer decision till end of compilation.
2404 finish_compilation will call rest_of_compilation again
2405 for those functions that need to be output. Also defer those
2406 functions that we are supposed to defer. */
2409 || (DECL_INLINE (decl
)
2410 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2411 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2412 && ! flag_keep_inline_functions
)
2413 || DECL_EXTERNAL (decl
))))
2414 DECL_DEFER_OUTPUT (decl
) = 1;
2416 if (DECL_INLINE (decl
))
2417 /* DWARF wants separate debugging info for abstract and
2418 concrete instances of all inline functions, including those
2419 declared inline but not inlined, and those inlined even
2420 though they weren't declared inline. Conveniently, that's
2421 what DECL_INLINE means at this point. */
2422 (*debug_hooks
->deferred_inline_function
) (decl
);
2424 if (DECL_DEFER_OUTPUT (decl
))
2426 /* If -Wreturn-type, we have to do a bit of compilation. We just
2427 want to call cleanup the cfg to figure out whether or not we can
2428 fall off the end of the function; we do the minimum amount of
2429 work necessary to make that safe. */
2430 if (warn_return_type
)
2432 int saved_optimize
= optimize
;
2435 rebuild_jump_labels (insns
);
2436 find_exception_handler_labels ();
2437 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2438 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2439 optimize
= saved_optimize
;
2441 /* CFG is no longer maintained up-to-date. */
2442 free_bb_for_insn ();
2445 current_function_nothrow
= nothrow_function_p ();
2446 if (current_function_nothrow
)
2447 /* Now we know that this can't throw; set the flag for the benefit
2448 of other functions later in this translation unit. */
2449 TREE_NOTHROW (current_function_decl
) = 1;
2451 timevar_push (TV_INTEGRATION
);
2452 save_for_inline (decl
);
2453 timevar_pop (TV_INTEGRATION
);
2454 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2455 goto exit_rest_of_compilation
;
2458 /* If specified extern inline but we aren't inlining it, we are
2459 done. This goes for anything that gets here with DECL_EXTERNAL
2460 set, not just things with DECL_INLINE. */
2461 if (DECL_EXTERNAL (decl
))
2462 goto exit_rest_of_compilation
;
2465 /* If we're emitting a nested function, make sure its parent gets
2466 emitted as well. Doing otherwise confuses debug info. */
2469 for (parent
= DECL_CONTEXT (current_function_decl
);
2470 parent
!= NULL_TREE
;
2471 parent
= get_containing_scope (parent
))
2472 if (TREE_CODE (parent
) == FUNCTION_DECL
)
2473 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
2476 /* We are now committed to emitting code for this function. Do any
2477 preparation, such as emitting abstract debug info for the inline
2478 before it gets mangled by optimization. */
2479 if (DECL_INLINE (decl
))
2480 (*debug_hooks
->outlining_inline_function
) (decl
);
2482 /* Remove any notes we don't need. That will make iterating
2483 over the instruction sequence faster, and allow the garbage
2484 collector to reclaim the memory used by the notes. */
2485 remove_unnecessary_notes ();
2490 /* Initialize some variables used by the optimizers. */
2491 init_function_for_compilation ();
2493 if (! DECL_DEFER_OUTPUT (decl
))
2494 TREE_ASM_WRITTEN (decl
) = 1;
2496 /* Now that integrate will no longer see our rtl, we need not
2497 distinguish between the return value of this function and the
2498 return value of called functions. Also, we can remove all SETs
2499 of subregs of hard registers; they are only here because of
2500 integrate. Also, we can now initialize pseudos intended to
2501 carry magic hard reg data throughout the function. */
2502 rtx_equal_function_value_matters
= 0;
2503 purge_hard_subreg_sets (get_insns ());
2505 /* Early return if there were errors. We can run afoul of our
2506 consistency checks, and there's not really much point in fixing them.
2507 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2508 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2509 || errorcount
|| sorrycount
)
2510 goto exit_rest_of_compilation
;
2512 timevar_push (TV_JUMP
);
2513 open_dump_file (DFI_sibling
, decl
);
2514 insns
= get_insns ();
2515 rebuild_jump_labels (insns
);
2516 find_exception_handler_labels ();
2517 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2519 delete_unreachable_blocks ();
2521 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2522 note_prediction_to_br_prob ();
2524 /* We may have potential sibling or tail recursion sites. Select one
2525 (of possibly multiple) methods of performing the call. */
2526 if (flag_optimize_sibling_calls
)
2529 optimize_sibling_and_tail_recursive_calls ();
2531 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2532 notes before simplifying cfg and we must do lowering after sibcall
2533 that unhides parts of RTL chain and cleans up the CFG.
2535 Until sibcall is replaced by tree-level optimizer, lets just
2536 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2537 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2538 if (GET_CODE (insn
) == NOTE
2539 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2542 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2543 timevar_pop (TV_JUMP
);
2545 /* Complete generation of exception handling code. */
2546 find_exception_handler_labels ();
2549 timevar_push (TV_JUMP
);
2550 open_dump_file (DFI_eh
, decl
);
2552 finish_eh_generation ();
2554 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2555 timevar_pop (TV_JUMP
);
2558 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2559 generation, which might create new sets. */
2560 emit_initial_value_sets ();
2563 /* If we are doing position-independent code generation, now
2564 is the time to output special prologues and epilogues.
2565 We do not want to do this earlier, because it just clutters
2566 up inline functions with meaningless insns. */
2571 insns
= get_insns ();
2573 /* Copy any shared structure that should not be shared. */
2574 unshare_all_rtl (current_function_decl
, insns
);
2576 #ifdef SETJMP_VIA_SAVE_AREA
2577 /* This must be performed before virtual register instantiation. */
2578 if (current_function_calls_alloca
)
2579 optimize_save_area_alloca (insns
);
2582 /* Instantiate all virtual registers. */
2583 instantiate_virtual_regs (current_function_decl
, insns
);
2585 open_dump_file (DFI_jump
, decl
);
2587 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2588 are initialized and to compute whether control can drop off the end
2591 timevar_push (TV_JUMP
);
2592 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2593 before jump optimization switches branch directions. */
2594 expected_value_to_br_prob ();
2596 reg_scan (insns
, max_reg_num (), 0);
2597 rebuild_jump_labels (insns
);
2598 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2600 dump_flow_info (rtl_dump_file
);
2601 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
2602 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2604 /* CFG is no longer maintained up-to-date. */
2605 free_bb_for_insn ();
2606 copy_loop_headers (insns
);
2607 purge_line_number_notes (insns
);
2609 timevar_pop (TV_JUMP
);
2610 close_dump_file (DFI_jump
, print_rtl
, insns
);
2612 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2613 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2615 goto exit_rest_of_compilation
;
2618 /* Long term, this should probably move before the jump optimizer too,
2619 but I didn't want to disturb the rtl_dump_and_exit and related
2620 stuff at this time. */
2621 if (optimize
> 0 && flag_ssa
)
2623 /* Convert to SSA form. */
2625 timevar_push (TV_TO_SSA
);
2626 open_dump_file (DFI_ssa
, decl
);
2628 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2629 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2632 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2633 timevar_pop (TV_TO_SSA
);
2635 /* Perform sparse conditional constant propagation, if requested. */
2638 timevar_push (TV_SSA_CCP
);
2639 open_dump_file (DFI_ssa_ccp
, decl
);
2643 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2644 timevar_pop (TV_SSA_CCP
);
2647 /* It would be useful to cleanup the CFG at this point, but block
2648 merging and possibly other transformations might leave a PHI
2649 node in the middle of a basic block, which is a strict no-no. */
2651 /* The SSA implementation uses basic block numbers in its phi
2652 nodes. Thus, changing the control-flow graph or the basic
2653 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2654 may cause problems. */
2658 /* Remove dead code. */
2660 timevar_push (TV_SSA_DCE
);
2661 open_dump_file (DFI_ssa_dce
, decl
);
2663 insns
= get_insns ();
2664 ssa_eliminate_dead_code ();
2666 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2667 timevar_pop (TV_SSA_DCE
);
2670 /* Convert from SSA form. */
2672 timevar_push (TV_FROM_SSA
);
2673 open_dump_file (DFI_ussa
, decl
);
2675 convert_from_ssa ();
2676 /* New registers have been created. Rescan their usage. */
2677 reg_scan (insns
, max_reg_num (), 1);
2679 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2680 timevar_pop (TV_FROM_SSA
);
2683 /* CFG is no longer maintained up-to-date. */
2684 free_bb_for_insn ();
2687 timevar_push (TV_JUMP
);
2689 if (flag_delete_null_pointer_checks
|| flag_if_conversion
)
2691 open_dump_file (DFI_null
, decl
);
2692 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2694 dump_flow_info (rtl_dump_file
);
2695 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2697 /* Try to identify useless null pointer tests and delete them. */
2698 if (flag_delete_null_pointer_checks
)
2699 delete_null_pointer_checks (insns
);
2701 timevar_push (TV_IFCVT
);
2702 if (flag_if_conversion
)
2704 timevar_pop (TV_IFCVT
);
2705 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2706 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2709 /* Jump optimization, and the removal of NULL pointer checks, may
2710 have reduced the number of instructions substantially. CSE, and
2711 future passes, allocate arrays whose dimensions involve the
2712 maximum instruction UID, so if we can reduce the maximum UID
2713 we'll save big on memory. */
2714 renumber_insns (rtl_dump_file
);
2716 compute_bb_for_insn (get_max_uid ());
2717 timevar_pop (TV_JUMP
);
2719 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
2723 /* Perform common subexpression elimination.
2724 Nonzero value from `cse_main' means that jumps were simplified
2725 and some code may now be unreachable, so do
2726 jump optimization again. */
2730 open_dump_file (DFI_cse
, decl
);
2732 dump_flow_info (rtl_dump_file
);
2733 timevar_push (TV_CSE
);
2735 reg_scan (insns
, max_reg_num (), 1);
2737 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2739 rebuild_jump_labels (insns
);
2740 purge_all_dead_edges (0);
2742 delete_trivially_dead_insns (insns
, max_reg_num ());
2744 /* If we are not running more CSE passes, then we are no longer
2745 expecting CSE to be run. But always rerun it in a cheap mode. */
2746 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2748 if (tem
|| optimize
> 1)
2749 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2750 /* Try to identify useless null pointer tests and delete them. */
2751 if (flag_delete_null_pointer_checks
|| flag_thread_jumps
)
2753 timevar_push (TV_JUMP
);
2755 if (flag_delete_null_pointer_checks
)
2756 delete_null_pointer_checks (insns
);
2757 /* CFG is no longer maintained up-to-date. */
2758 timevar_pop (TV_JUMP
);
2761 /* The second pass of jump optimization is likely to have
2762 removed a bunch more instructions. */
2763 renumber_insns (rtl_dump_file
);
2764 compute_bb_for_insn (get_max_uid ());
2766 timevar_pop (TV_CSE
);
2767 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2770 open_dump_file (DFI_addressof
, decl
);
2772 purge_addressof (insns
);
2774 purge_all_dead_edges (0);
2775 reg_scan (insns
, max_reg_num (), 1);
2777 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2781 /* Perform global cse. */
2783 if (optimize
> 0 && flag_gcse
)
2785 int save_csb
, save_cfj
;
2788 timevar_push (TV_GCSE
);
2789 open_dump_file (DFI_gcse
, decl
);
2791 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2792 tem
= gcse_main (insns
, rtl_dump_file
);
2793 rebuild_jump_labels (insns
);
2794 delete_trivially_dead_insns (insns
, max_reg_num ());
2796 save_csb
= flag_cse_skip_blocks
;
2797 save_cfj
= flag_cse_follow_jumps
;
2798 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2800 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2802 if (flag_expensive_optimizations
)
2804 timevar_push (TV_CSE
);
2805 reg_scan (insns
, max_reg_num (), 1);
2806 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2807 purge_all_dead_edges (0);
2808 delete_trivially_dead_insns (insns
, max_reg_num ());
2809 timevar_pop (TV_CSE
);
2810 cse_not_expected
= !flag_rerun_cse_after_loop
;
2813 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2814 things up. Then possibly re-run CSE again. */
2818 timevar_push (TV_JUMP
);
2819 rebuild_jump_labels (insns
);
2820 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2821 timevar_pop (TV_JUMP
);
2823 if (flag_expensive_optimizations
)
2825 timevar_push (TV_CSE
);
2826 reg_scan (insns
, max_reg_num (), 1);
2827 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2828 purge_all_dead_edges (0);
2829 delete_trivially_dead_insns (insns
, max_reg_num ());
2830 timevar_pop (TV_CSE
);
2834 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2835 timevar_pop (TV_GCSE
);
2838 flag_cse_skip_blocks
= save_csb
;
2839 flag_cse_follow_jumps
= save_cfj
;
2840 #ifdef ENABLE_CHECKING
2841 verify_flow_info ();
2845 /* Move constant computations out of loops. */
2847 if (optimize
> 0 && flag_loop_optimize
)
2849 timevar_push (TV_LOOP
);
2850 delete_dead_jumptables ();
2851 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2852 open_dump_file (DFI_loop
, decl
);
2853 /* CFG is no longer maintained up-to-date. */
2854 free_bb_for_insn ();
2856 if (flag_rerun_loop_opt
)
2858 cleanup_barriers ();
2860 /* We only want to perform unrolling once. */
2861 loop_optimize (insns
, rtl_dump_file
, LOOP_FIRST_PASS
);
2863 /* The first call to loop_optimize makes some instructions
2864 trivially dead. We delete those instructions now in the
2865 hope that doing so will make the heuristics in loop work
2866 better and possibly speed up compilation. */
2867 delete_trivially_dead_insns (insns
, max_reg_num ());
2869 /* The regscan pass is currently necessary as the alias
2870 analysis code depends on this information. */
2871 reg_scan (insns
, max_reg_num (), 1);
2873 cleanup_barriers ();
2874 loop_optimize (insns
, rtl_dump_file
,
2875 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
2876 | (flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0));
2878 /* Loop can create trivially dead instructions. */
2879 delete_trivially_dead_insns (insns
, max_reg_num ());
2880 close_dump_file (DFI_loop
, print_rtl
, insns
);
2881 timevar_pop (TV_LOOP
);
2886 /* Do control and data flow analysis; wrote some of the results to
2889 timevar_push (TV_FLOW
);
2890 open_dump_file (DFI_cfg
, decl
);
2892 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2894 dump_flow_info (rtl_dump_file
);
2895 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0)
2896 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2898 /* It may make more sense to mark constant functions after dead code is
2899 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2900 may insert code making function non-constant, but we still must consider
2901 it as constant, otherwise -fbranch-probabilities will not read data back.
2903 life_analyzis rarely eliminates modification of external memory.
2906 mark_constant_function ();
2908 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2910 /* Do branch profiling and static profile estimation passes. */
2911 if (optimize
> 0 || cfun
->arc_profile
|| flag_branch_probabilities
)
2915 timevar_push (TV_BRANCH_PROB
);
2916 open_dump_file (DFI_bp
, decl
);
2917 if (cfun
->arc_profile
|| flag_branch_probabilities
)
2920 /* Discover and record the loop depth at the head of each basic
2921 block. The loop infrastructure does the real job for us. */
2922 flow_loops_find (&loops
, LOOP_TREE
);
2924 /* Estimate using heuristics if no profiling info is available. */
2925 if (flag_guess_branch_prob
)
2926 estimate_probability (&loops
);
2929 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2931 flow_loops_free (&loops
);
2932 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2933 timevar_pop (TV_BRANCH_PROB
);
2938 timevar_push (TV_CSE2
);
2939 open_dump_file (DFI_cse2
, decl
);
2941 dump_flow_info (rtl_dump_file
);
2943 if (flag_rerun_cse_after_loop
)
2945 timevar_push (TV_JUMP
);
2947 reg_scan (insns
, max_reg_num (), 0);
2949 timevar_push (TV_IFCVT
);
2950 cleanup_cfg (CLEANUP_EXPENSIVE
);
2951 if (flag_if_conversion
)
2953 timevar_pop (TV_IFCVT
);
2955 timevar_pop (TV_JUMP
);
2956 /* CFG is no longer maintained up-to-date. */
2957 reg_scan (insns
, max_reg_num (), 0);
2958 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
2959 purge_all_dead_edges (0);
2960 delete_trivially_dead_insns (insns
, max_reg_num ());
2964 timevar_push (TV_JUMP
);
2965 rebuild_jump_labels (insns
);
2966 cleanup_cfg (CLEANUP_EXPENSIVE
);
2967 timevar_pop (TV_JUMP
);
2971 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
2972 timevar_pop (TV_CSE2
);
2977 cse_not_expected
= 1;
2979 open_dump_file (DFI_life
, decl
);
2982 check_function_return_warnings ();
2984 #ifdef ENABLE_CHECKING
2985 verify_flow_info ();
2987 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
2989 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
2990 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2991 timevar_pop (TV_FLOW
);
2995 if (warn_uninitialized
|| extra_warnings
)
2997 uninitialized_vars_warning (DECL_INITIAL (decl
));
2999 setjmp_args_warning ();
3005 if (initialize_uninitialized_subregs ())
3007 /* Insns were inserted, so things might look a bit different. */
3008 insns
= get_insns ();
3009 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES
,
3010 PROP_LOG_LINKS
| PROP_REG_INFO
3011 | PROP_DEATH_NOTES
);
3015 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3019 /* If -opt, try combining insns through substitution. */
3023 int rebuild_jump_labels_after_combine
= 0;
3025 timevar_push (TV_COMBINE
);
3026 open_dump_file (DFI_combine
, decl
);
3028 rebuild_jump_labels_after_combine
3029 = combine_instructions (insns
, max_reg_num ());
3031 /* Combining insns may have turned an indirect jump into a
3032 direct jump. Rebuid the JUMP_LABEL fields of jumping
3034 if (rebuild_jump_labels_after_combine
)
3036 timevar_push (TV_JUMP
);
3037 rebuild_jump_labels (insns
);
3038 timevar_pop (TV_JUMP
);
3040 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3043 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3044 timevar_pop (TV_COMBINE
);
3049 /* Rerun if-conversion, as combine may have simplified things enough to
3050 now meet sequence length restrictions. */
3051 if (flag_if_conversion
)
3053 timevar_push (TV_IFCVT
);
3054 open_dump_file (DFI_ce
, decl
);
3060 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3061 timevar_pop (TV_IFCVT
);
3064 /* Register allocation pre-pass, to reduce number of moves
3065 necessary for two-address machines. */
3066 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3068 timevar_push (TV_REGMOVE
);
3069 open_dump_file (DFI_regmove
, decl
);
3071 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3073 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3074 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3075 timevar_pop (TV_REGMOVE
);
3080 /* Do unconditional splitting before register allocation to allow machine
3081 description to add extra information not needed previously. */
3082 split_all_insns (1);
3084 /* Any of the several passes since flow1 will have munged register
3085 lifetime data a bit. */
3086 register_life_up_to_date
= 0;
3088 #ifdef OPTIMIZE_MODE_SWITCHING
3089 timevar_push (TV_MODE_SWITCH
);
3092 optimize_mode_switching (NULL
);
3095 timevar_pop (TV_MODE_SWITCH
);
3098 timevar_push (TV_SCHED
);
3100 #ifdef INSN_SCHEDULING
3102 /* Print function header into sched dump now
3103 because doing the sched analysis makes some of the dump. */
3104 if (optimize
> 0 && flag_schedule_insns
)
3106 open_dump_file (DFI_sched
, decl
);
3108 /* Do control and data sched analysis,
3109 and write some of the results to dump file. */
3111 schedule_insns (rtl_dump_file
);
3113 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3115 /* Register lifetime information was updated as part of verifying
3117 register_life_up_to_date
= 1;
3120 timevar_pop (TV_SCHED
);
3124 /* Determine if the current function is a leaf before running reload
3125 since this can impact optimizations done by the prologue and
3126 epilogue thus changing register elimination offsets. */
3127 current_function_is_leaf
= leaf_function_p ();
3129 timevar_push (TV_LOCAL_ALLOC
);
3130 open_dump_file (DFI_lreg
, decl
);
3132 /* Allocate pseudo-regs that are used only within 1 basic block.
3134 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3135 jump optimizer after register allocation and reloading are finished. */
3137 if (! register_life_up_to_date
)
3138 recompute_reg_usage (insns
, ! optimize_size
);
3140 /* Allocate the reg_renumber array. */
3141 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3143 /* And the reg_equiv_memory_loc array. */
3144 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3146 allocate_initial_values (reg_equiv_memory_loc
);
3148 regclass (insns
, max_reg_num (), rtl_dump_file
);
3149 rebuild_label_notes_after_reload
= local_alloc ();
3151 timevar_pop (TV_LOCAL_ALLOC
);
3153 if (dump_file
[DFI_lreg
].enabled
)
3155 timevar_push (TV_DUMP
);
3157 dump_flow_info (rtl_dump_file
);
3158 dump_local_alloc (rtl_dump_file
);
3160 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3161 timevar_pop (TV_DUMP
);
3166 timevar_push (TV_GLOBAL_ALLOC
);
3167 open_dump_file (DFI_greg
, decl
);
3169 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3170 pass fixing up any insns that are invalid. */
3173 failure
= global_alloc (rtl_dump_file
);
3176 build_insn_chain (insns
);
3177 failure
= reload (insns
, 0);
3180 timevar_pop (TV_GLOBAL_ALLOC
);
3182 if (dump_file
[DFI_greg
].enabled
)
3184 timevar_push (TV_DUMP
);
3186 dump_global_regs (rtl_dump_file
);
3188 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3189 timevar_pop (TV_DUMP
);
3193 goto exit_rest_of_compilation
;
3197 open_dump_file (DFI_postreload
, decl
);
3199 /* Do a very simple CSE pass over just the hard registers. */
3202 timevar_push (TV_RELOAD_CSE_REGS
);
3203 reload_cse_regs (insns
);
3204 timevar_pop (TV_RELOAD_CSE_REGS
);
3207 /* Register allocation and reloading may have turned an indirect jump into
3208 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3209 jumping instructions. */
3210 if (rebuild_label_notes_after_reload
)
3212 timevar_push (TV_JUMP
);
3214 rebuild_jump_labels (insns
);
3215 purge_all_dead_edges (0);
3217 timevar_pop (TV_JUMP
);
3220 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3222 /* Re-create the death notes which were deleted during reload. */
3223 timevar_push (TV_FLOW2
);
3224 open_dump_file (DFI_flow2
, decl
);
3226 #ifdef ENABLE_CHECKING
3227 verify_flow_info ();
3230 /* If optimizing, then go ahead and split insns now. */
3232 split_all_insns (0);
3234 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3236 /* On some machines, the prologue and epilogue code, or parts thereof,
3237 can be represented as RTL. Doing so lets us schedule insns between
3238 it and the rest of the code and also allows delayed branch
3239 scheduling to operate in the epilogue. */
3240 thread_prologue_and_epilogue_insns (insns
);
3244 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3245 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3246 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3248 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3249 even for machines with possibly nonzero RETURN_POPS_ARGS
3250 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3251 push instructions will have popping returns. */
3252 #ifndef PUSH_ROUNDING
3253 if (!ACCUMULATE_OUTGOING_ARGS
)
3255 combine_stack_adjustments ();
3260 flow2_completed
= 1;
3262 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3263 timevar_pop (TV_FLOW2
);
3265 #ifdef HAVE_peephole2
3266 if (optimize
> 0 && flag_peephole2
)
3268 timevar_push (TV_PEEPHOLE2
);
3269 open_dump_file (DFI_peephole2
, decl
);
3271 peephole2_optimize (rtl_dump_file
);
3273 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3274 timevar_pop (TV_PEEPHOLE2
);
3278 if (optimize
> 0 && (flag_rename_registers
|| flag_cprop_registers
))
3280 timevar_push (TV_RENAME_REGISTERS
);
3281 open_dump_file (DFI_rnreg
, decl
);
3283 if (flag_rename_registers
)
3284 regrename_optimize ();
3285 if (flag_cprop_registers
)
3286 copyprop_hardreg_forward ();
3288 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3289 timevar_pop (TV_RENAME_REGISTERS
);
3292 if (flag_if_conversion2
)
3294 timevar_push (TV_IFCVT2
);
3295 open_dump_file (DFI_ce2
, decl
);
3299 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3300 timevar_pop (TV_IFCVT2
);
3304 split_all_insns (1);
3307 #ifdef INSN_SCHEDULING
3308 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3310 timevar_push (TV_SCHED2
);
3311 open_dump_file (DFI_sched2
, decl
);
3313 /* Do control and data sched analysis again,
3314 and write some more of the results to dump file. */
3316 split_all_insns (1);
3318 schedule_insns (rtl_dump_file
);
3320 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3321 timevar_pop (TV_SCHED2
);
3327 #ifdef LEAF_REGISTERS
3328 current_function_uses_only_leaf_regs
3329 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3333 timevar_push (TV_REG_STACK
);
3334 open_dump_file (DFI_stack
, decl
);
3336 reg_to_stack (insns
, rtl_dump_file
);
3338 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3339 timevar_pop (TV_REG_STACK
);
3345 timevar_push (TV_REORDER_BLOCKS
);
3346 open_dump_file (DFI_bbro
, decl
);
3348 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3349 splitting possibly introduced more crossjumping oppurtuntities.
3350 Except that we can't actually run crossjumping without running
3351 another DCE pass, which we can't do after reg-stack. */
3352 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3353 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3354 if (flag_reorder_blocks
)
3356 reorder_basic_blocks ();
3357 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3360 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3361 timevar_pop (TV_REORDER_BLOCKS
);
3363 compute_alignments ();
3365 /* CFG is no longer maintained up-to-date. */
3366 free_bb_for_insn ();
3368 /* If a machine dependent reorganization is needed, call it. */
3369 #ifdef MACHINE_DEPENDENT_REORG
3370 timevar_push (TV_MACH_DEP
);
3371 open_dump_file (DFI_mach
, decl
);
3373 MACHINE_DEPENDENT_REORG (insns
);
3375 close_dump_file (DFI_mach
, print_rtl
, insns
);
3376 timevar_pop (TV_MACH_DEP
);
3381 purge_line_number_notes (insns
);
3382 cleanup_barriers ();
3384 /* If a scheduling pass for delayed branches is to be done,
3385 call the scheduling code. */
3388 if (optimize
> 0 && flag_delayed_branch
)
3390 timevar_push (TV_DBR_SCHED
);
3391 open_dump_file (DFI_dbr
, decl
);
3393 dbr_schedule (insns
, rtl_dump_file
);
3395 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3396 timevar_pop (TV_DBR_SCHED
);
3402 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3403 timevar_push (TV_SHORTEN_BRANCH
);
3404 split_all_insns_noflow ();
3405 timevar_pop (TV_SHORTEN_BRANCH
);
3408 convert_to_eh_region_ranges ();
3410 /* Shorten branches. */
3411 timevar_push (TV_SHORTEN_BRANCH
);
3412 shorten_branches (get_insns ());
3413 timevar_pop (TV_SHORTEN_BRANCH
);
3415 current_function_nothrow
= nothrow_function_p ();
3416 if (current_function_nothrow
)
3417 /* Now we know that this can't throw; set the flag for the benefit
3418 of other functions later in this translation unit. */
3419 TREE_NOTHROW (current_function_decl
) = 1;
3421 /* Now turn the rtl into assembler code. */
3423 timevar_push (TV_FINAL
);
3428 /* Get the function's name, as described by its RTL. This may be
3429 different from the DECL_NAME name used in the source file. */
3431 x
= DECL_RTL (decl
);
3432 if (GET_CODE (x
) != MEM
)
3435 if (GET_CODE (x
) != SYMBOL_REF
)
3437 fnname
= XSTR (x
, 0);
3439 assemble_start_function (decl
, fnname
);
3440 final_start_function (insns
, asm_out_file
, optimize
);
3441 final (insns
, asm_out_file
, optimize
, 0);
3442 final_end_function ();
3444 #ifdef IA64_UNWIND_INFO
3445 /* ??? The IA-64 ".handlerdata" directive must be issued before
3446 the ".endp" directive that closes the procedure descriptor. */
3447 output_function_exception_table ();
3450 assemble_end_function (decl
, fnname
);
3452 #ifndef IA64_UNWIND_INFO
3453 /* Otherwise, it feels unclean to switch sections in the middle. */
3454 output_function_exception_table ();
3458 fflush (asm_out_file
);
3460 /* Release all memory allocated by flow. */
3461 free_basic_block_vars (0);
3463 /* Release all memory held by regsets now. */
3464 regset_release_memory ();
3466 timevar_pop (TV_FINAL
);
3470 /* Write DBX symbols if requested. */
3472 /* Note that for those inline functions where we don't initially
3473 know for certain that we will be generating an out-of-line copy,
3474 the first invocation of this routine (rest_of_compilation) will
3475 skip over this code by doing a `goto exit_rest_of_compilation;'.
3476 Later on, finish_compilation will call rest_of_compilation again
3477 for those inline functions that need to have out-of-line copies
3478 generated. During that call, we *will* be routed past here. */
3480 timevar_push (TV_SYMOUT
);
3481 (*debug_hooks
->function_decl
) (decl
);
3482 timevar_pop (TV_SYMOUT
);
3484 exit_rest_of_compilation
:
3486 /* In case the function was not output,
3487 don't leave any temporary anonymous types
3488 queued up for sdb output. */
3489 #ifdef SDB_DEBUGGING_INFO
3490 if (write_symbols
== SDB_DEBUG
)
3491 sdbout_types (NULL_TREE
);
3494 reload_completed
= 0;
3495 flow2_completed
= 0;
3498 timevar_push (TV_FINAL
);
3500 /* Clear out the insn_length contents now that they are no
3502 init_insn_lengths ();
3504 /* Show no temporary slots allocated. */
3507 free_basic_block_vars (0);
3508 free_bb_for_insn ();
3510 timevar_pop (TV_FINAL
);
3512 /* Make sure volatile mem refs aren't considered valid operands for
3513 arithmetic insns. We must call this here if this is a nested inline
3514 function, since the above code leaves us in the init_recog state
3515 (from final.c), and the function context push/pop code does not
3516 save/restore volatile_ok.
3518 ??? Maybe it isn't necessary for expand_start_function to call this
3519 anymore if we do it here? */
3521 init_recog_no_volatile ();
3523 /* We're done with this function. Free up memory if we can. */
3524 free_after_parsing (cfun
);
3525 if (! DECL_DEFER_OUTPUT (decl
))
3527 free_after_compilation (cfun
);
3529 /* Clear integrate.c's pointer to the cfun structure we just
3531 DECL_SAVED_INSNS (decl
) = 0;
3537 timevar_pop (TV_REST_OF_COMPILATION
);
3547 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3548 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3549 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3550 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3551 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3552 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"));
3553 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3555 for (i
= ARRAY_SIZE (f_options
); i
--;)
3557 const char *description
= f_options
[i
].description
;
3559 if (description
!= NULL
&& *description
!= 0)
3560 printf (" -f%-21s %s\n",
3561 f_options
[i
].string
, _(description
));
3564 printf (_(" -O[number] Set optimization level to [number]\n"));
3565 printf (_(" -Os Optimize for space rather than speed\n"));
3566 for (i
= LAST_PARAM
; i
--;)
3568 const char *description
= compiler_params
[i
].help
;
3569 const int length
= 21 - strlen (compiler_params
[i
].option
);
3571 if (description
!= NULL
&& *description
!= 0)
3572 printf (" --param %s=<value>%.*s%s\n",
3573 compiler_params
[i
].option
,
3574 length
> 0 ? length
: 1, " ",
3577 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3578 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3579 printf (_(" -w Suppress warnings\n"));
3580 printf (_(" -W Enable extra warnings\n"));
3582 for (i
= ARRAY_SIZE (W_options
); i
--;)
3584 const char *description
= W_options
[i
].description
;
3586 if (description
!= NULL
&& *description
!= 0)
3587 printf (" -W%-21s %s\n",
3588 W_options
[i
].string
, _(description
));
3591 printf (_(" -Wunused Enable unused warnings\n"));
3592 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3593 printf (_(" -p Enable function profiling\n"));
3594 printf (_(" -o <file> Place output into <file> \n"));
3596 -G <number> Put global and static data smaller than <number>\n\
3597 bytes into a special section (on some targets)\n"));
3599 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3601 if (debug_args
[i
].description
!= NULL
)
3602 printf (" -g%-21s %s\n",
3603 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3606 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3607 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3608 printf (_(" -version Display the compiler's version\n"));
3609 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3610 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3611 #if defined INSN_SCHEDULING
3612 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3614 printf (_(" --help Display this information\n"));
3619 /* Display descriptions of language specific options.
3620 If there is no description, note that there is an undocumented option.
3621 If the description is empty, do not display anything. (This allows
3622 options to be deliberately undocumented, for whatever reason).
3623 If the option string is missing, then this is a marker, indicating
3624 that the description string is in fact the name of a language, whose
3625 language specific options are to follow. */
3627 if (ARRAY_SIZE (documented_lang_options
) > 1)
3629 printf (_("\nLanguage specific options:\n"));
3631 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3633 const char *description
= documented_lang_options
[i
].description
;
3634 const char *option
= documented_lang_options
[i
].option
;
3636 if (description
== NULL
)
3641 printf (_(" %-23.23s [undocumented]\n"), option
);
3643 else if (*description
== 0)
3645 else if (option
== NULL
)
3649 (_("\nThere are undocumented %s specific options as well.\n"),
3653 printf (_("\n Options for %s:\n"), description
);
3658 printf (" %-23.23s %s\n", option
, _(description
));
3663 printf (_("\nThere are undocumented %s specific options as well.\n"),
3666 display_target_options ();
3670 display_target_options ()
3673 static bool displayed
= false;
3675 /* Avoid double printing for --help --target-help. */
3680 if (ARRAY_SIZE (target_switches
) > 1
3681 #ifdef TARGET_OPTIONS
3682 || ARRAY_SIZE (target_options
) > 1
3690 printf (_("\nTarget specific options:\n"));
3692 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3694 const char *option
= target_switches
[i
].name
;
3695 const char *description
= target_switches
[i
].description
;
3697 if (option
== NULL
|| *option
== 0)
3699 else if (description
== NULL
)
3704 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3706 else if (*description
!= 0)
3707 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3710 #ifdef TARGET_OPTIONS
3711 for (i
= ARRAY_SIZE (target_options
); i
--;)
3713 const char *option
= target_options
[i
].prefix
;
3714 const char *description
= target_options
[i
].description
;
3716 if (option
== NULL
|| *option
== 0)
3718 else if (description
== NULL
)
3723 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3725 else if (*description
!= 0)
3726 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3732 printf (_("\nThere are undocumented target specific options as well.\n"));
3734 printf (_(" They exist, but they are not documented.\n"));
3739 /* Parse a -d... command line switch. */
3742 decode_d_option (arg
)
3751 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3752 dump_file
[i
].enabled
= 1;
3758 flag_print_asm_name
= 1;
3761 flag_dump_rtl_in_asm
= 1;
3762 flag_print_asm_name
= 1;
3765 graph_dump_format
= vcg
;
3768 rtl_dump_and_exit
= 1;
3773 case 'D': /* These are handled by the preprocessor. */
3779 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3780 if (c
== dump_file
[i
].debug_switch
)
3782 dump_file
[i
].enabled
= 1;
3787 warning ("unrecognized gcc debugging option: %c", c
);
3792 /* Parse a -f... command line switch. ARG is the value after the -f.
3793 It is safe to access 'ARG - 2' to generate the full switch name.
3794 Return the number of strings consumed. */
3797 decode_f_option (arg
)
3801 const char *option_value
= NULL
;
3803 /* Search for the option in the table of binary f options. */
3804 for (j
= ARRAY_SIZE (f_options
); j
--;)
3806 if (!strcmp (arg
, f_options
[j
].string
))
3808 *f_options
[j
].variable
= f_options
[j
].on_value
;
3812 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3813 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3815 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3820 if (!strcmp (arg
, "fast-math"))
3821 set_fast_math_flags (1);
3822 else if (!strcmp (arg
, "no-fast-math"))
3823 set_fast_math_flags (0);
3824 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3825 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3828 read_integral_parameter (option_value
, arg
- 2,
3830 set_param_value ("max-inline-insns", val
);
3832 else if ((option_value
= skip_leading_substring (arg
, "tls-model=")))
3834 if (strcmp (option_value
, "global-dynamic") == 0)
3835 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
3836 else if (strcmp (option_value
, "local-dynamic") == 0)
3837 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
3838 else if (strcmp (option_value
, "initial-exec") == 0)
3839 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
3840 else if (strcmp (option_value
, "local-exec") == 0)
3841 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
3843 warning ("`%s': unknown tls-model option", arg
- 2);
3845 #ifdef INSN_SCHEDULING
3846 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3847 fix_sched_param ("verbose", option_value
);
3849 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3850 fix_register (option_value
, 1, 1);
3851 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3852 fix_register (option_value
, 0, 1);
3853 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3854 fix_register (option_value
, 0, 0);
3855 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3856 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3857 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3859 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3860 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3861 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3862 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3864 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3865 else if ((option_value
3866 = skip_leading_substring (arg
, "stack-limit-register=")))
3868 int reg
= decode_reg_name (option_value
);
3870 error ("unrecognized register name `%s'", option_value
);
3872 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3874 else if ((option_value
3875 = skip_leading_substring (arg
, "stack-limit-symbol=")))
3878 nm
= ggc_strdup (option_value
);
3879 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
3881 else if ((option_value
3882 = skip_leading_substring (arg
, "message-length=")))
3883 output_set_maximum_length
3884 (&global_dc
->buffer
, read_integral_parameter
3885 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
3886 else if ((option_value
3887 = skip_leading_substring (arg
, "diagnostics-show-location=")))
3889 if (!strcmp (option_value
, "once"))
3890 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
3891 else if (!strcmp (option_value
, "every-line"))
3892 diagnostic_prefixing_rule (global_dc
)
3893 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
3895 error ("unrecognized option `%s'", arg
- 2);
3897 else if (!strcmp (arg
, "no-stack-limit"))
3898 stack_limit_rtx
= NULL_RTX
;
3899 else if (!strcmp (arg
, "preprocessed"))
3900 /* Recognise this switch but do nothing. This prevents warnings
3901 about an unrecognized switch if cpplib has not been linked in. */
3909 /* Parse a -W... command line switch. ARG is the value after the -W.
3910 It is safe to access 'ARG - 2' to generate the full switch name.
3911 Return the number of strings consumed. */
3914 decode_W_option (arg
)
3917 const char *option_value
= NULL
;
3920 /* Search for the option in the table of binary W options. */
3922 for (j
= ARRAY_SIZE (W_options
); j
--;)
3924 if (!strcmp (arg
, W_options
[j
].string
))
3926 *W_options
[j
].variable
= W_options
[j
].on_value
;
3930 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3931 && ! strcmp (arg
+ 3, W_options
[j
].string
))
3933 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
3938 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
3939 warning ("-Wid-clash-LEN is no longer supported");
3940 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
3942 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
3944 warn_larger_than
= larger_than_size
!= -1;
3946 else if (!strcmp (arg
, "unused"))
3950 else if (!strcmp (arg
, "no-unused"))
3960 /* Parse a -g... command line switch. ARG is the value after the -g.
3961 It is safe to access 'ARG - 2' to generate the full switch name.
3962 Return the number of strings consumed. */
3965 decode_g_option (arg
)
3968 static unsigned level
= 0;
3969 /* A lot of code assumes write_symbols == NO_DEBUG if the
3970 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3971 of what debugging type has been selected). This records the
3972 selected type. It is an error to specify more than one
3974 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
3975 /* Non-zero if debugging format has been explicitly set.
3976 -g and -ggdb don't explicitly set the debugging format so
3977 -gdwarf -g3 is equivalent to -gdwarf3. */
3978 static int type_explicitly_set_p
= 0;
3979 /* Indexed by enum debug_info_type. */
3980 static const char *const debug_type_names
[] =
3982 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3985 /* The maximum admissible debug level value. */
3986 static const unsigned max_debug_level
= 3;
3988 /* Look up ARG in the table. */
3989 for (da
= debug_args
; da
->arg
; da
++)
3991 const int da_len
= strlen (da
->arg
);
3993 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
3995 enum debug_info_type type
= da
->debug_type
;
3996 const char *p
= arg
+ da_len
;
3998 if (*p
&& ! ISDIGIT (*p
))
4001 /* A debug flag without a level defaults to level 2.
4002 Note we do not want to call read_integral_parameter
4003 for that case since it will call atoi which
4006 ??? We may want to generalize the interface to
4007 read_integral_parameter to better handle this case
4008 if this case shows up often. */
4010 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4012 level
= (level
== 0) ? 2 : level
;
4014 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4016 error ("use -gdwarf -g%d for DWARF v1, level %d",
4019 error ("use -gdwarf-2 for DWARF v2");
4022 if (level
> max_debug_level
)
4025 ignoring option `%s' due to invalid debug level specification",
4027 level
= debug_info_level
;
4030 if (type
== NO_DEBUG
)
4032 type
= PREFERRED_DEBUGGING_TYPE
;
4034 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4036 #ifdef DWARF2_DEBUGGING_INFO
4037 type
= DWARF2_DEBUG
;
4039 #ifdef DBX_DEBUGGING_INFO
4046 if (type
== NO_DEBUG
)
4047 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4049 /* Does it conflict with an already selected type? */
4050 if (type_explicitly_set_p
4051 /* -g/-ggdb don't conflict with anything. */
4052 && da
->debug_type
!= NO_DEBUG
4053 && type
!= selected_debug_type
)
4054 warning ("`%s' ignored, conflicts with `-g%s'",
4055 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4058 /* If the format has already been set, -g/-ggdb
4059 only change the debug level. */
4060 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4061 /* Don't change debugging type. */
4065 selected_debug_type
= type
;
4066 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4069 write_symbols
= (level
== 0
4071 : selected_debug_type
);
4072 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4073 debug_info_level
= (enum debug_info_level
) level
;
4086 /* Decode the first argument in the argv as a language-independent option.
4087 Return the number of strings consumed. */
4090 independent_decode_option (argc
, argv
)
4094 char *arg
= argv
[0];
4096 if (arg
[0] != '-' || arg
[1] == 0)
4108 if (!strcmp (arg
, "-help"))
4111 exit_after_options
= 1;
4114 if (!strcmp (arg
, "-target-help"))
4116 display_target_options ();
4117 exit_after_options
= 1;
4120 if (!strcmp (arg
, "-version"))
4122 print_version (stderr
, "");
4123 exit_after_options
= 1;
4126 /* Handle '--param <name>=<value>'. */
4127 if (strcmp (arg
, "-param") == 0)
4133 error ("-param option missing argument");
4137 /* Get the '<name>=<value>' parameter. */
4139 /* Look for the `='. */
4140 equal
= strchr (arg
, '=');
4142 error ("invalid --param option: %s", arg
);
4147 /* Zero out the `=' sign so that we get two separate strings. */
4149 /* Figure out what value is specified. */
4150 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4151 if (val
!= INVALID_PARAM_VAL
)
4152 set_param_value (arg
, val
);
4154 error ("invalid parameter value `%s'", equal
+ 1);
4169 /* Already been treated in main (). Do nothing. */
4173 set_target_switch (arg
+ 1);
4177 return decode_f_option (arg
+ 1);
4180 return decode_g_option (arg
+ 1);
4183 if (!strcmp (arg
, "dumpbase"))
4188 dump_base_name
= argv
[1];
4192 decode_d_option (arg
+ 1);
4196 if (!strcmp (arg
, "pedantic"))
4198 else if (!strcmp (arg
, "pedantic-errors"))
4199 flag_pedantic_errors
= pedantic
= 1;
4200 else if (arg
[1] == 0)
4207 if (!strcmp (arg
, "quiet"))
4214 if (!strcmp (arg
, "version"))
4222 inhibit_warnings
= 1;
4231 /* We save the value of warn_uninitialized, since if they put
4232 -Wuninitialized on the command line, we need to generate a
4233 warning about not using it without also specifying -O. */
4234 if (warn_uninitialized
!= 1)
4235 warn_uninitialized
= 2;
4238 return decode_W_option (arg
+ 1);
4242 if (!strncmp (arg
, "aux-info", 8))
4249 aux_info_file_name
= argv
[1];
4250 flag_gen_aux_info
= 1;
4253 else if (arg
[8] == '=')
4255 aux_info_file_name
= arg
+ 9;
4256 flag_gen_aux_info
= 1;
4271 asm_file_name
= argv
[1];
4286 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4291 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4295 if (g_switch_val
== -1)
4299 g_switch_set
= TRUE
;
4300 g_switch_value
= g_switch_val
;
4310 /* Decode -m switches. */
4311 /* Decode the switch -mNAME. */
4314 set_target_switch (name
)
4318 int valid_target_option
= 0;
4320 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4321 if (!strcmp (target_switches
[j
].name
, name
))
4323 if (target_switches
[j
].value
< 0)
4324 target_flags
&= ~-target_switches
[j
].value
;
4326 target_flags
|= target_switches
[j
].value
;
4327 valid_target_option
= 1;
4330 #ifdef TARGET_OPTIONS
4331 if (!valid_target_option
)
4332 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4334 int len
= strlen (target_options
[j
].prefix
);
4335 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4337 *target_options
[j
].variable
= name
+ len
;
4338 valid_target_option
= 1;
4343 if (!valid_target_option
)
4344 error ("invalid option `%s'", name
);
4347 /* Print version information to FILE.
4348 Each line begins with INDENT (for the case where FILE is the
4349 assembler output file). */
4352 print_version (file
, indent
)
4357 #define __VERSION__ "[?]"
4361 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4363 "%s%s%s version %s (%s) compiled by CC.\n"
4365 , indent
, *indent
!= 0 ? " " : "",
4366 lang_hooks
.name
, version_string
, TARGET_NAME
,
4367 indent
, __VERSION__
);
4370 /* Print an option value and return the adjusted position in the line.
4371 ??? We don't handle error returns from fprintf (disk full); presumably
4372 other code will catch a disk full though. */
4375 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4378 const char *indent
, *sep
, *term
, *type
, *name
;
4380 /* The ultrix fprintf returns 0 on success, so compute the result we want
4381 here since we need it for the following test. */
4382 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4387 fprintf (file
, "%s", term
);
4392 fprintf (file
, "%s", indent
);
4393 pos
= strlen (indent
);
4395 fprintf (file
, "%s%s%s", sep
, type
, name
);
4400 /* Print active target switches to FILE.
4401 POS is the current cursor position and MAX is the size of a "line".
4402 Each line begins with INDENT and ends with TERM.
4403 Each switch is separated from the next by SEP. */
4406 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4409 const char *indent
, *sep
, *term
;
4414 /* Print the options as passed. */
4416 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4417 _("options passed: "), "");
4419 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4423 if (strcmp (*p
, "-o") == 0)
4429 if (strcmp (*p
, "-quiet") == 0)
4431 if (strcmp (*p
, "-version") == 0)
4436 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4439 fprintf (file
, "%s", term
);
4441 /* Print the -f and -m options that have been enabled.
4442 We don't handle language specific options but printing argv
4445 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4446 _("options enabled: "), "");
4448 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4449 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4450 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4451 "-f", f_options
[j
].string
);
4453 /* Print target specific options. */
4455 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4456 if (target_switches
[j
].name
[0] != '\0'
4457 && target_switches
[j
].value
> 0
4458 && ((target_switches
[j
].value
& target_flags
)
4459 == target_switches
[j
].value
))
4461 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4462 "-m", target_switches
[j
].name
);
4465 #ifdef TARGET_OPTIONS
4466 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4467 if (*target_options
[j
].variable
!= NULL
)
4470 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4471 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4472 prefix
, *target_options
[j
].variable
);
4476 fprintf (file
, "%s", term
);
4479 /* Open assembly code output file. Do this even if -fsyntax-only is
4480 on, because then the driver will have provided the name of a
4481 temporary file or bit bucket for us. NAME is the file specified on
4482 the command line, possibly NULL. */
4484 init_asm_output (name
)
4487 if (name
== NULL
&& asm_file_name
== 0)
4488 asm_out_file
= stdout
;
4491 if (asm_file_name
== 0)
4493 int len
= strlen (dump_base_name
);
4494 char *dumpname
= (char *) xmalloc (len
+ 6);
4495 memcpy (dumpname
, dump_base_name
, len
+ 1);
4496 strip_off_ending (dumpname
, len
);
4497 strcat (dumpname
, ".s");
4498 asm_file_name
= dumpname
;
4500 if (!strcmp (asm_file_name
, "-"))
4501 asm_out_file
= stdout
;
4503 asm_out_file
= fopen (asm_file_name
, "w");
4504 if (asm_out_file
== 0)
4505 fatal_io_error ("can't open %s for writing", asm_file_name
);
4508 #ifdef IO_BUFFER_SIZE
4509 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4510 _IOFBF
, IO_BUFFER_SIZE
);
4513 if (!flag_syntax_only
)
4515 #ifdef ASM_FILE_START
4516 ASM_FILE_START (asm_out_file
);
4519 #ifdef ASM_COMMENT_START
4520 if (flag_verbose_asm
)
4522 /* Print the list of options in effect. */
4523 print_version (asm_out_file
, ASM_COMMENT_START
);
4524 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4525 ASM_COMMENT_START
, " ", "\n");
4526 /* Add a blank line here so it appears in assembler output but not
4528 fprintf (asm_out_file
, "\n");
4534 /* Initialization of the front end environment, before command line
4535 options are parsed. Signal handlers, internationalization etc.
4536 ARGV0 is main's argv[0]. */
4538 general_init (argv0
)
4543 p
= argv0
+ strlen (argv0
);
4544 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4548 xmalloc_set_program_name (progname
);
4550 gcc_init_libintl ();
4552 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4554 signal (SIGSEGV
, crash_signal
);
4557 signal (SIGILL
, crash_signal
);
4560 signal (SIGBUS
, crash_signal
);
4563 signal (SIGABRT
, crash_signal
);
4565 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4566 signal (SIGIOT
, crash_signal
);
4569 signal (SIGFPE
, crash_signal
);
4572 /* Initialize the diagnostics reporting machinery, so option parsing
4573 can give warnings and errors. */
4574 diagnostic_initialize (global_dc
);
4577 /* Parse command line options and set default flag values, called
4578 after language-independent option-independent initialization. Do
4579 minimal options processing. Outputting diagnostics is OK, but GC
4580 and identifier hashtables etc. are not initialized yet. */
4582 parse_options_and_default_flags (argc
, argv
)
4588 /* Save in case md file wants to emit args as a comment. */
4592 /* Initialize register usage now so switches may override. */
4595 /* Register the language-independent parameters. */
4596 add_params (lang_independent_params
, LAST_PARAM
);
4598 /* Perform language-specific options initialization. */
4599 (*lang_hooks
.init_options
) ();
4601 /* Scan to see what optimization level has been specified. That will
4602 determine the default value of many flags. */
4603 for (i
= 1; i
< argc
; i
++)
4605 if (!strcmp (argv
[i
], "-O"))
4610 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4612 /* Handle -Os, -O2, -O3, -O69, ... */
4613 char *p
= &argv
[i
][2];
4615 if ((p
[0] == 's') && (p
[1] == 0))
4619 /* Optimizing for size forces optimize to be 2. */
4624 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4625 if (optimize_val
!= -1)
4627 optimize
= optimize_val
;
4636 flag_merge_constants
= 0;
4642 flag_thread_jumps
= 1;
4644 flag_delayed_branch
= 1;
4646 #ifdef CAN_DEBUG_WITHOUT_FP
4647 flag_omit_frame_pointer
= 1;
4649 flag_guess_branch_prob
= 1;
4650 flag_cprop_registers
= 1;
4651 flag_loop_optimize
= 1;
4652 flag_crossjumping
= 1;
4653 flag_if_conversion
= 1;
4654 flag_if_conversion2
= 1;
4659 flag_optimize_sibling_calls
= 1;
4660 flag_cse_follow_jumps
= 1;
4661 flag_cse_skip_blocks
= 1;
4663 flag_expensive_optimizations
= 1;
4664 flag_strength_reduce
= 1;
4665 flag_rerun_cse_after_loop
= 1;
4666 flag_rerun_loop_opt
= 1;
4667 flag_caller_saves
= 1;
4670 #ifdef INSN_SCHEDULING
4671 flag_schedule_insns
= 1;
4672 flag_schedule_insns_after_reload
= 1;
4675 flag_strict_aliasing
= 1;
4676 flag_delete_null_pointer_checks
= 1;
4677 flag_reorder_blocks
= 1;
4678 flag_reorder_functions
= 1;
4683 flag_inline_functions
= 1;
4684 flag_rename_registers
= 1;
4687 if (optimize
< 2 || optimize_size
)
4692 align_functions
= 1;
4695 /* Initialize whether `char' is signed. */
4696 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4697 #ifdef DEFAULT_SHORT_ENUMS
4698 /* Initialize how much space enums occupy, by default. */
4699 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4702 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4705 set_target_switch ("");
4707 /* Unwind tables are always present in an ABI-conformant IA-64
4708 object file, so the default should be ON. */
4709 #ifdef IA64_UNWIND_INFO
4710 flag_unwind_tables
= IA64_UNWIND_INFO
;
4713 #ifdef OPTIMIZATION_OPTIONS
4714 /* Allow default optimizations to be specified on a per-machine basis. */
4715 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4718 /* Perform normal command line switch decoding. */
4719 for (i
= 1; i
< argc
;)
4722 int indep_processed
;
4724 /* Give the language a chance to decode the option for itself. */
4725 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4727 if (lang_processed
>= 0)
4728 /* Now see if the option also has a language independent meaning.
4729 Some options are both language specific and language independent,
4731 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4734 lang_processed
= -lang_processed
;
4735 indep_processed
= 0;
4738 if (lang_processed
|| indep_processed
)
4739 i
+= MAX (lang_processed
, indep_processed
);
4742 const char *option
= NULL
;
4743 const char *lang
= NULL
;
4746 /* It is possible that the command line switch is not valid for the
4747 current language, but it is valid for another language. In order
4748 to be compatible with previous versions of the compiler (which
4749 did not issue an error message in this case) we check for this
4750 possibility here. If we do find a match, then if extra_warnings
4751 is set we generate a warning message, otherwise we will just
4752 ignore the option. */
4753 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4755 option
= documented_lang_options
[j
].option
;
4758 lang
= documented_lang_options
[j
].description
;
4759 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4763 if (j
!= ARRAY_SIZE (documented_lang_options
))
4767 warning ("ignoring command line option '%s'", argv
[i
]);
4770 ("(it is valid for %s but not the selected language)",
4774 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4775 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4777 error ("unrecognized option `%s'", argv
[i
]);
4783 if (flag_no_inline
== 2)
4786 flag_really_no_inline
= flag_no_inline
;
4788 /* Set flag_no_inline before the post_options () hook. The C front
4789 ends use it to determine tree inlining defaults. FIXME: such
4790 code should be lang-independent when all front ends use tree
4791 inlining, in which case it, and this condition, should be moved
4792 to the top of process_options() instead. */
4795 /* Inlining does not work if not optimizing,
4796 so force it not to be done. */
4800 /* The c_decode_option function and decode_option hook set
4801 this to `2' if -Wall is used, so we can avoid giving out
4802 lots of errors for people who don't realize what -Wall does. */
4803 if (warn_uninitialized
== 1)
4804 warning ("-Wuninitialized is not supported without -O");
4807 if (flag_really_no_inline
== 2)
4808 flag_really_no_inline
= flag_no_inline
;
4810 /* All command line options have been parsed; allow the front end to
4811 perform consistency checks, etc. */
4812 (*lang_hooks
.post_options
) ();
4815 /* Process the options that have been parsed. */
4819 #ifdef OVERRIDE_OPTIONS
4820 /* Some machines may reject certain combinations of options. */
4824 /* Set up the align_*_log variables, defaulting them to 1 if they
4825 were still unset. */
4826 if (align_loops
<= 0) align_loops
= 1;
4827 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4828 align_loops_max_skip
= align_loops
- 1;
4829 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4830 if (align_jumps
<= 0) align_jumps
= 1;
4831 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4832 align_jumps_max_skip
= align_jumps
- 1;
4833 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4834 if (align_labels
<= 0) align_labels
= 1;
4835 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4836 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4837 align_labels_max_skip
= align_labels
- 1;
4838 if (align_functions
<= 0) align_functions
= 1;
4839 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4841 /* Unrolling all loops implies that standard loop unrolling must also
4843 if (flag_unroll_all_loops
)
4844 flag_unroll_loops
= 1;
4845 /* Loop unrolling requires that strength_reduction be on also. Silently
4846 turn on strength reduction here if it isn't already on. Also, the loop
4847 unrolling code assumes that cse will be run after loop, so that must
4848 be turned on also. */
4849 if (flag_unroll_loops
)
4851 flag_strength_reduce
= 1;
4852 flag_rerun_cse_after_loop
= 1;
4855 if (flag_non_call_exceptions
)
4856 flag_asynchronous_unwind_tables
= 1;
4857 if (flag_asynchronous_unwind_tables
)
4858 flag_unwind_tables
= 1;
4860 /* Warn about options that are not supported on this machine. */
4861 #ifndef INSN_SCHEDULING
4862 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4863 warning ("instruction scheduling not supported on this target machine");
4866 if (flag_delayed_branch
)
4867 warning ("this target machine does not have delayed branches");
4870 /* Some operating systems do not allow profiling without a frame
4872 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4874 && flag_omit_frame_pointer
)
4876 error ("profiling does not work without a frame pointer");
4877 flag_omit_frame_pointer
= 0;
4880 user_label_prefix
= USER_LABEL_PREFIX
;
4881 if (flag_leading_underscore
!= -1)
4883 /* If the default prefix is more complicated than "" or "_",
4884 issue a warning and ignore this option. */
4885 if (user_label_prefix
[0] == 0 ||
4886 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4888 user_label_prefix
= flag_leading_underscore
? "_" : "";
4891 warning ("-f%sleading-underscore not supported on this target machine",
4892 flag_leading_underscore
? "" : "no-");
4895 /* If we are in verbose mode, write out the version and maybe all the
4896 option flags in use. */
4899 print_version (stderr
, "");
4901 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4907 if (flag_syntax_only
)
4909 write_symbols
= NO_DEBUG
;
4913 /* Now we know write_symbols, set up the debug hooks based on it.
4914 By default we do nothing for debug output. */
4915 #if defined(DBX_DEBUGGING_INFO)
4916 if (write_symbols
== DBX_DEBUG
)
4917 debug_hooks
= &dbx_debug_hooks
;
4919 #if defined(XCOFF_DEBUGGING_INFO)
4920 if (write_symbols
== XCOFF_DEBUG
)
4921 debug_hooks
= &xcoff_debug_hooks
;
4923 #ifdef SDB_DEBUGGING_INFO
4924 if (write_symbols
== SDB_DEBUG
)
4925 debug_hooks
= &sdb_debug_hooks
;
4927 #ifdef DWARF_DEBUGGING_INFO
4928 if (write_symbols
== DWARF_DEBUG
)
4929 debug_hooks
= &dwarf_debug_hooks
;
4931 #ifdef DWARF2_DEBUGGING_INFO
4932 if (write_symbols
== DWARF2_DEBUG
)
4933 debug_hooks
= &dwarf2_debug_hooks
;
4935 #ifdef VMS_DEBUGGING_INFO
4936 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4937 debug_hooks
= &vmsdbg_debug_hooks
;
4940 /* If auxiliary info generation is desired, open the output file.
4941 This goes in the same directory as the source file--unlike
4942 all the other output files. */
4943 if (flag_gen_aux_info
)
4945 aux_info_file
= fopen (aux_info_file_name
, "w");
4946 if (aux_info_file
== 0)
4947 fatal_io_error ("can't open %s", aux_info_file_name
);
4950 if (! targetm
.have_named_sections
)
4952 if (flag_function_sections
)
4954 warning ("-ffunction-sections not supported for this target");
4955 flag_function_sections
= 0;
4957 if (flag_data_sections
)
4959 warning ("-fdata-sections not supported for this target");
4960 flag_data_sections
= 0;
4964 if (flag_function_sections
&& profile_flag
)
4966 warning ("-ffunction-sections disabled; it makes profiling impossible");
4967 flag_function_sections
= 0;
4970 #ifndef HAVE_prefetch
4971 if (flag_prefetch_loop_arrays
)
4973 warning ("-fprefetch-loop-arrays not supported for this target");
4974 flag_prefetch_loop_arrays
= 0;
4977 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
4979 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4980 flag_prefetch_loop_arrays
= 0;
4984 /* This combination of options isn't handled for i386 targets and doesn't
4985 make much sense anyway, so don't allow it. */
4986 if (flag_prefetch_loop_arrays
&& optimize_size
)
4988 warning ("-fprefetch-loop-arrays is not supported with -Os");
4989 flag_prefetch_loop_arrays
= 0;
4992 #ifndef OBJECT_FORMAT_ELF
4993 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
4994 warning ("-ffunction-sections may affect debugging on some targets");
4998 /* Language-independent initialization, before language-dependent
5001 lang_independent_init ()
5003 /* Initialize the garbage-collector, and string pools. */
5005 ggc_add_rtx_root (&stack_limit_rtx
, 1);
5006 ggc_add_tree_root (¤t_function_decl
, 1);
5007 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
5012 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5013 || debug_info_level
== DINFO_LEVEL_VERBOSE
5014 #ifdef VMS_DEBUGGING_INFO
5015 /* Enable line number info for traceback */
5016 || debug_info_level
> DINFO_LEVEL_NONE
5018 || flag_test_coverage
5019 || warn_notreached
);
5025 init_function_once ();
5026 init_stor_layout_once ();
5027 init_varasm_once ();
5028 init_EXPR_INSN_LIST_cache ();
5030 /* The following initialization functions need to generate rtl, so
5031 provide a dummy function context for them. */
5032 init_dummy_function_start ();
5034 if (flag_caller_saves
)
5035 init_caller_save ();
5036 expand_dummy_function_end ();
5039 /* Language-dependent initialization. Returns non-zero on success. */
5041 lang_dependent_init (name
)
5044 if (dump_base_name
== 0)
5045 dump_base_name
= name
? name
: "gccdump";
5047 /* Front-end initialization. This hook can assume that GC,
5048 identifier hashes etc. are set up, but debug initialization is
5049 not done yet. This routine must return the original filename
5050 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5051 name
= (*lang_hooks
.init
) (name
);
5055 /* Is this duplication necessary? */
5056 name
= ggc_strdup (name
);
5057 main_input_filename
= input_filename
= name
;
5058 init_asm_output (name
);
5060 /* These create various _DECL nodes, so need to be called after the
5061 front end is initialized. */
5066 /* Put an entry on the input file stack for the main input file. */
5067 push_srcloc (input_filename
, 0);
5069 /* If dbx symbol table desired, initialize writing it and output the
5070 predefined types. */
5071 timevar_push (TV_SYMOUT
);
5073 #ifdef DWARF2_UNWIND_INFO
5074 if (dwarf2out_do_frame ())
5075 dwarf2out_frame_init ();
5078 /* Now we have the correct original filename, we can initialize
5080 (*debug_hooks
->init
) (name
);
5082 timevar_pop (TV_SYMOUT
);
5087 /* Clean up: close opened files, etc. */
5092 /* Close the dump files. */
5093 if (flag_gen_aux_info
)
5095 fclose (aux_info_file
);
5097 unlink (aux_info_file_name
);
5100 /* Close non-debugging input and output files. Take special care to note
5101 whether fclose returns an error, since the pages might still be on the
5102 buffer chain while the file is open. */
5106 if (ferror (asm_out_file
) != 0)
5107 fatal_io_error ("error writing to %s", asm_file_name
);
5108 if (fclose (asm_out_file
) != 0)
5109 fatal_io_error ("error closing %s", asm_file_name
);
5112 /* Do whatever is necessary to finish printing the graphs. */
5113 if (graph_dump_format
!= no_graph
)
5117 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5118 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5123 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5124 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5125 finish_graph_dump_file (dump_base_name
, suffix
);
5132 ggc_print_statistics ();
5133 stringpool_statistics ();
5134 dump_tree_statistics ();
5137 /* Free up memory for the benefit of leak detectors. */
5140 /* Language-specific end of compilation actions. */
5141 (*lang_hooks
.finish
) ();
5144 /* Initialize the compiler, and compile the input file. */
5148 /* The bulk of command line switch processing. */
5151 /* We cannot start timing until after options are processed since that
5152 says if we run timers or not. */
5154 timevar_start (TV_TOTAL
);
5156 /* Language-independent initialization. Also sets up GC, identifier
5158 lang_independent_init ();
5160 /* Language-dependent initialization. Returns true on success. */
5161 if (lang_dependent_init (filename
))
5166 /* Stop timing and print the times. */
5167 timevar_stop (TV_TOTAL
);
5168 timevar_print (stderr
);
5171 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5172 Decode command args, then call compile_file.
5173 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5174 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5176 It is not safe to call this function more than once. */
5179 toplev_main (argc
, argv
)
5185 /* Initialization of GCC's environment, and diagnostics. */
5186 general_init (argv
[0]);
5188 /* Parse the options and do minimal processing; basically just
5189 enough to default flags appropriately. */
5190 parse_options_and_default_flags (argc
, argv
);
5192 /* Exit early if we can (e.g. -help). */
5193 if (!errorcount
&& !exit_after_options
)
5196 if (errorcount
|| sorrycount
)
5197 return (FATAL_EXIT_CODE
);
5199 return (SUCCESS_EXIT_CODE
);