2 /* Top level of GNU C compiler
3 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* This is the top level of cc1/c++.
24 It parses command args, opens files, invokes the various passes
25 in the proper order, and counts the time used by each.
26 Error messages and low-level interface to malloc also handled here. */
29 #undef FLOAT /* This is for hpux. They should change hpux. */
30 #undef FFS /* Some systems define this in param.h. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.h"
49 #include "insn-flags.h"
50 #include "hard-reg-set.h"
57 #include "basic-block.h"
64 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
72 #include "langhooks.h"
73 #include "cfglayout.h"
75 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
76 #include "dwarf2out.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
83 #ifdef SDB_DEBUGGING_INFO
87 #ifdef XCOFF_DEBUGGING_INFO
88 #include "xcoffout.h" /* Needed for external data
89 declarations for e.g. AIX 4.x. */
92 /* Carry information from ASM_DECLARE_OBJECT_NAME
93 to ASM_FINISH_DECLARE_OBJECT. */
95 extern int size_directive_output
;
96 extern tree last_assemble_variable_decl
;
98 static void general_init
PARAMS ((char *));
99 static void parse_options_and_default_flags
PARAMS ((int, char **));
100 static void do_compile
PARAMS ((void));
101 static void process_options
PARAMS ((void));
102 static void lang_independent_init
PARAMS ((void));
103 static int lang_dependent_init
PARAMS ((const char *));
104 static void init_asm_output
PARAMS ((const char *));
105 static void finalize
PARAMS ((void));
107 static void set_target_switch
PARAMS ((const char *));
109 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
110 static void compile_file
PARAMS ((void));
111 static void display_help
PARAMS ((void));
112 static void display_target_options
PARAMS ((void));
114 static void decode_d_option
PARAMS ((const char *));
115 static int decode_f_option
PARAMS ((const char *));
116 static int decode_W_option
PARAMS ((const char *));
117 static int decode_g_option
PARAMS ((const char *));
118 static unsigned int independent_decode_option
PARAMS ((int, char **));
120 static void print_version
PARAMS ((FILE *, const char *));
121 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
122 const char *, const char *,
123 const char *, const char *));
124 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
125 const char *, const char *));
127 /* Nonzero to dump debug info whilst parsing (-dy option). */
128 static int set_yydebug
;
130 /* Length of line when printing switch values. */
133 /* Name of program invoked, sans directories. */
135 const char *progname
;
137 /* Copy of arguments to toplev_main. */
141 /* Name of current original source file (what was input to cpp).
142 This comes from each #-command in the actual input. */
144 const char *input_filename
;
146 /* Name of top-level original source file (what was input to cpp).
147 This comes from the #-command at the beginning of the actual input.
148 If there isn't any there, then this is the cc1 input file name. */
150 const char *main_input_filename
;
152 /* Current line number in real source file. */
156 /* Nonzero if it is unsafe to create any new pseudo registers. */
159 /* Stack of currently pending input files. */
161 struct file_stack
*input_file_stack
;
163 /* Incremented on each change to input_file_stack. */
164 int input_file_stack_tick
;
166 /* Name to use as base of names for dump output files. */
168 const char *dump_base_name
;
170 /* Format to use to print dumpfile index value */
171 #ifndef DUMPFILE_FORMAT
172 #define DUMPFILE_FORMAT ".%02d."
175 /* Bit flags that specify the machine subtype we are compiling for.
176 Bits are tested using macros TARGET_... defined in the tm.h file
177 and set by `-m...' switches. Must be defined in rtlanal.c. */
179 extern int target_flags
;
181 /* Debug hooks - dependent upon command line options. */
183 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
185 /* Describes a dump file. */
187 struct dump_file_info
189 /* The unique extension to apply, e.g. ".jump". */
190 const char *const extension
;
192 /* The -d<c> character that enables this dump file. */
193 char const debug_switch
;
195 /* True if there is a corresponding graph dump file. */
196 char const graph_dump_p
;
198 /* True if the user selected this dump. */
201 /* True if the files have been initialized (ie truncated). */
205 /* Enumerate the extant dump files. */
246 /* Describes all the dump files. Should be kept in order of the
247 pass and in sync with dump_file_index above.
249 Remaining -d letters:
255 static struct dump_file_info dump_file
[DFI_MAX
] =
257 { "rtl", 'r', 0, 0, 0 },
258 { "sibling", 'i', 0, 0, 0 },
259 { "eh", 'h', 0, 0, 0 },
260 { "jump", 'j', 0, 0, 0 },
261 { "ssa", 'e', 1, 0, 0 },
262 { "ssaccp", 'W', 1, 0, 0 },
263 { "ssadce", 'X', 1, 0, 0 },
264 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
265 { "null", 'u', 0, 0, 0 },
266 { "cse", 's', 0, 0, 0 },
267 { "addressof", 'F', 0, 0, 0 },
268 { "gcse", 'G', 1, 0, 0 },
269 { "loop", 'L', 1, 0, 0 },
270 { "cfg", 'f', 1, 0, 0 },
271 { "bp", 'b', 1, 0, 0 },
272 { "tracer", 'T', 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
= TLS_MODEL_GLOBAL_DYNAMIC
;
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 /* Nonzero if we perform superblock formation. */
872 /* Values of the -falign-* flags: how much to align labels in code.
873 0 means `use default', 1 means `don't align'.
874 For each variable, there is an _log variant which is the power
875 of two not less than the variable, for .align output. */
879 int align_loops_max_skip
;
882 int align_jumps_max_skip
;
884 int align_labels_log
;
885 int align_labels_max_skip
;
887 int align_functions_log
;
889 /* Table of supported debugging formats. */
892 const char *const arg
;
893 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
894 constant expression, we use NO_DEBUG in its place. */
895 const enum debug_info_type debug_type
;
896 const int use_extensions_p
;
897 const char *const description
;
901 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
902 N_("Generate debugging info in default format") },
903 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
904 #ifdef DBX_DEBUGGING_INFO
905 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
906 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
908 #ifdef DWARF_DEBUGGING_INFO
909 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
910 { "dwarf+", DWARF_DEBUG
, 1,
911 N_("Generate extended DWARF-1 format debug info") },
913 #ifdef DWARF2_DEBUGGING_INFO
914 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
916 #ifdef XCOFF_DEBUGGING_INFO
917 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
918 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
920 #ifdef SDB_DEBUGGING_INFO
921 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
923 #ifdef VMS_DEBUGGING_INFO
924 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
931 const char *const string
;
934 const char *const description
;
936 lang_independent_options
;
940 /* Add or remove a leading underscore from user symbols. */
941 int flag_leading_underscore
= -1;
943 /* The user symbol prefix after having resolved same. */
944 const char *user_label_prefix
;
946 static const param_info lang_independent_params
[] = {
947 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
948 { OPTION, DEFAULT, HELP },
949 #include "params.def"
954 /* A default for same. */
955 #ifndef USER_LABEL_PREFIX
956 #define USER_LABEL_PREFIX ""
959 /* Table of language-independent -f options.
960 STRING is the option name. VARIABLE is the address of the variable.
961 ON_VALUE is the value to store in VARIABLE
962 if `-fSTRING' is seen as an option.
963 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
965 static const lang_independent_options f_options
[] =
967 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
968 N_("Perform DWARF2 duplicate elimination") },
969 {"float-store", &flag_float_store
, 1,
970 N_("Do not store floats in registers") },
971 {"volatile", &flag_volatile
, 1,
972 N_("Consider all mem refs through pointers as volatile") },
973 {"volatile-global", &flag_volatile_global
, 1,
974 N_("Consider all mem refs to global data to be volatile") },
975 {"volatile-static", &flag_volatile_static
, 1,
976 N_("Consider all mem refs to static data to be volatile") },
977 {"defer-pop", &flag_defer_pop
, 1,
978 N_("Defer popping functions args from stack until later") },
979 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
980 N_("When possible do not generate stack frames") },
981 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
982 N_("Optimize sibling and tail recursive calls") },
983 {"tracer", &flag_tracer
, 1,
984 N_("Perform superblock formation via tail duplication") },
985 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
986 N_("When running CSE, follow jumps to their targets") },
987 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
988 N_("When running CSE, follow conditional jumps") },
989 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
990 N_("Perform a number of minor, expensive optimizations") },
991 {"thread-jumps", &flag_thread_jumps
, 1,
992 N_("Perform jump threading optimizations") },
993 {"strength-reduce", &flag_strength_reduce
, 1,
994 N_("Perform strength reduction optimizations") },
995 {"unroll-loops", &flag_unroll_loops
, 1,
996 N_("Perform loop unrolling when iteration count is known") },
997 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
998 N_("Perform loop unrolling for all loops") },
999 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
1000 N_("Generate prefetch instructions, if available, for arrays in loops") },
1001 {"move-all-movables", &flag_move_all_movables
, 1,
1002 N_("Force all loop invariant computations out of loops") },
1003 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1004 N_("Strength reduce all loop general induction variables") },
1005 {"writable-strings", &flag_writable_strings
, 1,
1006 N_("Store strings in writable data section") },
1007 {"peephole", &flag_no_peephole
, 0,
1008 N_("Enable machine specific peephole optimizations") },
1009 {"force-mem", &flag_force_mem
, 1,
1010 N_("Copy memory operands into registers before using") },
1011 {"force-addr", &flag_force_addr
, 1,
1012 N_("Copy memory address constants into regs before using") },
1013 {"function-cse", &flag_no_function_cse
, 0,
1014 N_("Allow function addresses to be held in registers") },
1015 {"inline-functions", &flag_inline_functions
, 1,
1016 N_("Integrate simple functions into their callers") },
1017 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1018 N_("Generate code for funcs even if they are fully inlined") },
1019 {"inline", &flag_no_inline
, 0,
1020 N_("Pay attention to the 'inline' keyword") },
1021 {"keep-static-consts", &flag_keep_static_consts
, 1,
1022 N_("Emit static const variables even if they are not used") },
1023 {"syntax-only", &flag_syntax_only
, 1,
1024 N_("Check for syntax errors, then stop") },
1025 {"shared-data", &flag_shared_data
, 1,
1026 N_("Mark data as shared rather than private") },
1027 {"caller-saves", &flag_caller_saves
, 1,
1028 N_("Enable saving registers around function calls") },
1029 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1030 N_("Return 'short' aggregates in memory, not registers") },
1031 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1032 N_("Return 'short' aggregates in registers") },
1033 {"delayed-branch", &flag_delayed_branch
, 1,
1034 N_("Attempt to fill delay slots of branch instructions") },
1035 {"gcse", &flag_gcse
, 1,
1036 N_("Perform the global common subexpression elimination") },
1037 {"gcse-lm", &flag_gcse_lm
, 1,
1038 N_("Perform enhanced load motion during global subexpression elimination") },
1039 {"gcse-sm", &flag_gcse_sm
, 1,
1040 N_("Perform store motion after global subexpression elimination") },
1041 {"loop-optimize", &flag_loop_optimize
, 1,
1042 N_("Perform the loop optimizations") },
1043 {"crossjumping", &flag_crossjumping
, 1,
1044 N_("Perform cross-jumping optimization") },
1045 {"if-conversion", &flag_if_conversion
, 1,
1046 N_("Perform conversion of conditional jumps to branchless equivalents") },
1047 {"if-conversion2", &flag_if_conversion2
, 1,
1048 N_("Perform conversion of conditional jumps to conditional execution") },
1049 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1050 N_("Run CSE pass after loop optimizations") },
1051 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1052 N_("Run the loop optimizer twice") },
1053 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1054 N_("Delete useless null pointer checks") },
1055 {"schedule-insns", &flag_schedule_insns
, 1,
1056 N_("Reschedule instructions before register allocation") },
1057 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1058 N_("Reschedule instructions after register allocation") },
1059 {"sched-interblock",&flag_schedule_interblock
, 1,
1060 N_("Enable scheduling across basic blocks") },
1061 {"sched-spec",&flag_schedule_speculative
, 1,
1062 N_("Allow speculative motion of non-loads") },
1063 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1064 N_("Allow speculative motion of some loads") },
1065 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1066 N_("Allow speculative motion of more loads") },
1067 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1068 N_("Replace add,compare,branch with branch on count reg") },
1069 {"pic", &flag_pic
, 1,
1070 N_("Generate position independent code, if possible") },
1071 {"PIC", &flag_pic
, 2, ""},
1072 {"exceptions", &flag_exceptions
, 1,
1073 N_("Enable exception handling") },
1074 {"unwind-tables", &flag_unwind_tables
, 1,
1075 N_("Just generate unwind tables for exception handling") },
1076 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1077 N_("Generate unwind tables exact at each instruction boundary") },
1078 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1079 N_("Support synchronous non-call exceptions") },
1080 {"profile-arcs", &profile_arc_flag
, 1,
1081 N_("Insert arc based program profiling code") },
1082 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs
, 1,
1083 N_("Avoid thread safety profiling overhead") },
1084 {"test-coverage", &flag_test_coverage
, 1,
1085 N_("Create data files needed by gcov") },
1086 {"branch-probabilities", &flag_branch_probabilities
, 1,
1087 N_("Use profiling information for branch probabilities") },
1088 {"profile", &profile_flag
, 1,
1089 N_("Enable basic program profiling code") },
1090 {"reorder-blocks", &flag_reorder_blocks
, 1,
1091 N_("Reorder basic blocks to improve code placement") },
1092 {"reorder-functions", &flag_reorder_functions
, 1,
1093 N_("Reorder functions to improve code placement") },
1094 {"rename-registers", &flag_rename_registers
, 1,
1095 N_("Do the register renaming optimization pass") },
1096 {"cprop-registers", &flag_cprop_registers
, 1,
1097 N_("Do the register copy-propagation optimization pass") },
1098 {"common", &flag_no_common
, 0,
1099 N_("Do not put uninitialized globals in the common section") },
1100 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1101 N_("Do not generate .size directives") },
1102 {"function-sections", &flag_function_sections
, 1,
1103 N_("place each function into its own section") },
1104 {"data-sections", &flag_data_sections
, 1,
1105 N_("place data items into their own section") },
1106 {"verbose-asm", &flag_verbose_asm
, 1,
1107 N_("Add extra commentry to assembler output") },
1108 {"gnu-linker", &flag_gnu_linker
, 1,
1109 N_("Output GNU ld formatted global initializers") },
1110 {"regmove", &flag_regmove
, 1,
1111 N_("Enables a register move optimization") },
1112 {"optimize-register-move", &flag_regmove
, 1,
1113 N_("Do the full regmove optimization pass") },
1114 {"pack-struct", &flag_pack_struct
, 1,
1115 N_("Pack structure members together without holes") },
1116 {"stack-check", &flag_stack_check
, 1,
1117 N_("Insert stack checking code into the program") },
1118 {"argument-alias", &flag_argument_noalias
, 0,
1119 N_("Specify that arguments may alias each other & globals") },
1120 {"argument-noalias", &flag_argument_noalias
, 1,
1121 N_("Assume arguments may alias globals but not each other") },
1122 {"argument-noalias-global", &flag_argument_noalias
, 2,
1123 N_("Assume arguments do not alias each other or globals") },
1124 {"strict-aliasing", &flag_strict_aliasing
, 1,
1125 N_("Assume strict aliasing rules apply") },
1126 {"align-loops", &align_loops
, 0,
1127 N_("Align the start of loops") },
1128 {"align-jumps", &align_jumps
, 0,
1129 N_("Align labels which are only reached by jumping") },
1130 {"align-labels", &align_labels
, 0,
1131 N_("Align all labels") },
1132 {"align-functions", &align_functions
, 0,
1133 N_("Align the start of functions") },
1134 {"merge-constants", &flag_merge_constants
, 1,
1135 N_("Attempt to merge identical constants accross compilation units") },
1136 {"merge-all-constants", &flag_merge_constants
, 2,
1137 N_("Attempt to merge identical constants and constant variables") },
1138 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1139 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1140 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1141 N_("Instrument function entry/exit with profiling calls") },
1142 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1,
1143 N_("Put zero initialized data in the bss section") },
1144 {"ssa", &flag_ssa
, 1,
1145 N_("Enable SSA optimizations") },
1146 {"ssa-ccp", &flag_ssa_ccp
, 1,
1147 N_("Enable SSA conditional constant propagation") },
1148 {"ssa-dce", &flag_ssa_dce
, 1,
1149 N_("Enable aggressive SSA dead code elimination") },
1150 {"leading-underscore", &flag_leading_underscore
, 1,
1151 N_("External symbols have a leading underscore") },
1152 {"ident", &flag_no_ident
, 0,
1153 N_("Process #ident directives") },
1154 { "peephole2", &flag_peephole2
, 1,
1155 N_("Enables an rtl peephole pass run before sched2") },
1156 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1157 N_("Enables guessing of branch probabilities") },
1158 {"math-errno", &flag_errno_math
, 1,
1159 N_("Set errno after built-in math functions") },
1160 {"trapping-math", &flag_trapping_math
, 1,
1161 N_("Floating-point operations can trap") },
1162 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1163 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1164 {"bounded-pointers", &flag_bounded_pointers
, 1,
1165 N_("Compile pointers as triples: value, base & end") },
1166 {"bounds-check", &flag_bounds_check
, 1,
1167 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1168 {"single-precision-constant", &flag_single_precision_constant
, 1,
1169 N_("Convert floating point constant to single precision constant") },
1170 {"time-report", &time_report
, 1,
1171 N_("Report time taken by each compiler pass at end of run") },
1172 {"mem-report", &mem_report
, 1,
1173 N_("Report on permanent memory allocation at end of run") },
1174 { "trapv", &flag_trapv
, 1,
1175 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1178 /* Table of language-specific options. */
1180 static const struct lang_opt
1182 const char *const option
;
1183 const char *const description
;
1185 documented_lang_options
[] =
1187 /* In order not to overload the --help output, the convention
1188 used here is to only describe those options which are not
1189 enabled by default. */
1192 N_("Compile just for ISO C89") },
1194 N_("Determine language standard") },
1196 { "-fsigned-bitfields", "" },
1197 { "-funsigned-bitfields",
1198 N_("Make bit-fields by unsigned by default") },
1199 { "-fno-signed-bitfields", "" },
1200 { "-fno-unsigned-bitfields","" },
1202 N_("Make 'char' be signed by default") },
1203 { "-funsigned-char",
1204 N_("Make 'char' be unsigned by default") },
1205 { "-fno-signed-char", "" },
1206 { "-fno-unsigned-char", "" },
1210 N_("Do not recognize the 'asm' keyword") },
1211 { "-fbuiltin", "" },
1213 N_("Do not recognize any built in functions") },
1215 N_("Assume normal C execution environment") },
1216 { "-fno-hosted", "" },
1218 N_("Assume that standard libraries & main might not exist") },
1219 { "-fno-freestanding", "" },
1220 { "-fcond-mismatch",
1221 N_("Allow different types as args of ? operator") },
1222 { "-fno-cond-mismatch", "" },
1223 { "-fdollars-in-identifiers",
1224 N_("Allow the use of $ inside identifiers") },
1225 { "-fno-dollars-in-identifiers", "" },
1226 { "-fpreprocessed", "" },
1227 { "-fno-preprocessed", "" },
1229 N_("Use the same size for double as for float") },
1230 { "-fno-short-double", "" },
1232 N_("Use the smallest fitting integer to hold enums") },
1233 { "-fno-short-enums", "" },
1235 N_("Override the underlying type for wchar_t to `unsigned short'") },
1236 { "-fno-short-wchar", "" },
1239 N_("Enable most warning messages") },
1240 { "-Wbad-function-cast",
1241 N_("Warn about casting functions to incompatible types") },
1242 { "-Wno-bad-function-cast", "" },
1243 { "-Wmissing-format-attribute",
1244 N_("Warn about functions which might be candidates for format attributes") },
1245 { "-Wno-missing-format-attribute", "" },
1247 N_("Warn about casts which discard qualifiers") },
1248 { "-Wno-cast-qual", "" },
1249 { "-Wchar-subscripts",
1250 N_("Warn about subscripts whose type is 'char'") },
1251 { "-Wno-char-subscripts", "" },
1253 N_("Warn if nested comments are detected") },
1254 { "-Wno-comment", "" },
1256 N_("Warn if nested comments are detected") },
1257 { "-Wno-comments", "" },
1259 N_("Warn about possibly confusing type conversions") },
1260 { "-Wno-conversion", "" },
1261 { "-Wdiv-by-zero", "" },
1262 { "-Wno-div-by-zero",
1263 N_("Do not warn about compile-time integer division by zero") },
1265 N_("Warn about testing equality of floating point numbers") },
1266 { "-Wno-float-equal", "" },
1268 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1269 { "-Wno-format", "" },
1270 { "-Wformat-extra-args", "" },
1271 { "-Wno-format-extra-args",
1272 N_("Don't warn about too many arguments to format functions") },
1273 { "-Wformat-nonliteral",
1274 N_("Warn about non-string-literal format strings") },
1275 { "-Wno-format-nonliteral", "" },
1276 { "-Wformat-security",
1277 N_("Warn about possible security problems with format functions") },
1278 { "-Wno-format-security", "" },
1279 { "-Wformat-y2k", "" },
1280 { "-Wno-format-y2k",
1281 N_("Don't warn about strftime formats yielding 2 digit years") },
1282 { "-Wimplicit-function-declaration",
1283 N_("Warn about implicit function declarations") },
1284 { "-Wno-implicit-function-declaration", "" },
1285 { "-Werror-implicit-function-declaration", "" },
1287 N_("Warn when a declaration does not specify a type") },
1288 { "-Wno-implicit-int", "" },
1289 { "-Wimplicit", "" },
1290 { "-Wno-implicit", "" },
1292 N_("Warn about the use of the #import directive") },
1293 { "-Wno-import", "" },
1294 { "-Wlong-long","" },
1296 N_("Do not warn about using 'long long' when -pedantic") },
1298 N_("Warn about suspicious declarations of main") },
1299 { "-Wno-main", "" },
1300 { "-Wmissing-braces",
1301 N_("Warn about possibly missing braces around initializers") },
1302 { "-Wno-missing-braces", "" },
1303 { "-Wmissing-declarations",
1304 N_("Warn about global funcs without previous declarations") },
1305 { "-Wno-missing-declarations", "" },
1306 { "-Wmissing-prototypes",
1307 N_("Warn about global funcs without prototypes") },
1308 { "-Wno-missing-prototypes", "" },
1310 N_("Warn about use of multicharacter literals") },
1311 { "-Wno-multichar", "" },
1312 { "-Wnested-externs",
1313 N_("Warn about externs not at file scope level") },
1314 { "-Wno-nested-externs", "" },
1316 N_("Warn about possible missing parentheses") },
1317 { "-Wno-parentheses", "" },
1318 { "-Wpointer-arith",
1319 N_("Warn about function pointer arithmetic") },
1320 { "-Wno-pointer-arith", "" },
1321 { "-Wredundant-decls",
1322 N_("Warn about multiple declarations of the same object") },
1323 { "-Wno-redundant-decls", "" },
1325 N_("Warn whenever a function's return-type defaults to int") },
1326 { "-Wno-return-type", "" },
1327 { "-Wsequence-point",
1328 N_("Warn about possible violations of sequence point rules") },
1329 { "-Wno-sequence-point", "" },
1331 N_("Warn about signed/unsigned comparisons") },
1332 { "-Wno-sign-compare", "" },
1333 { "-Wstrict-prototypes",
1334 N_("Warn about non-prototyped function decls") },
1335 { "-Wno-strict-prototypes", "" },
1337 N_("Warn about constructs whose meanings change in ISO C") },
1338 { "-Wno-traditional", "" },
1340 N_("Warn when trigraphs are encountered") },
1341 { "-Wno-trigraphs", "" },
1343 { "-Wno-undef", "" },
1344 { "-Wunknown-pragmas",
1345 N_("Warn about unrecognized pragmas") },
1346 { "-Wno-unknown-pragmas", "" },
1347 { "-Wwrite-strings",
1348 N_("Mark strings as 'const char *'") },
1349 { "-Wno-write-strings", "" },
1351 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1353 #include "options.h"
1357 /* Here is a table, controlled by the tm.h file, listing each -m switch
1358 and which bits in `target_switches' it should set or clear.
1359 If VALUE is positive, it is bits to set.
1360 If VALUE is negative, -VALUE is bits to clear.
1361 (The sign bit is not used so there is no confusion.) */
1365 const char *const name
;
1367 const char *const description
;
1369 target_switches
[] = TARGET_SWITCHES
;
1371 /* This table is similar, but allows the switch to have a value. */
1373 #ifdef TARGET_OPTIONS
1376 const char *const prefix
;
1377 const char **const variable
;
1378 const char *const description
;
1380 target_options
[] = TARGET_OPTIONS
;
1383 /* Options controlling warnings. */
1385 /* Don't print warning messages. -w. */
1387 int inhibit_warnings
= 0;
1389 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1391 int warn_system_headers
= 0;
1393 /* Print various extra warnings. -W. */
1395 int extra_warnings
= 0;
1397 /* Treat warnings as errors. -Werror. */
1399 int warnings_are_errors
= 0;
1401 /* Nonzero to warn about unused variables, functions et.al. */
1403 int warn_unused_function
;
1404 int warn_unused_label
;
1405 int warn_unused_parameter
;
1406 int warn_unused_variable
;
1407 int warn_unused_value
;
1409 /* Nonzero to warn about code which is never reached. */
1411 int warn_notreached
;
1413 /* Nonzero to warn about variables used before they are initialized. */
1415 int warn_uninitialized
;
1417 /* Nonzero means warn about all declarations which shadow others. */
1421 /* Warn if a switch on an enum, that does not have a default case,
1422 fails to have a case for every enum value. */
1426 /* Warn if a switch does not have a default case. */
1428 int warn_switch_default
;
1430 /* Warn if a switch on an enum fails to have a case for every enum
1431 value (regardless of the presence or otherwise of a default case). */
1433 int warn_switch_enum
;
1435 /* Nonzero means warn about function definitions that default the return type
1436 or that use a null return and have a return-type other than void. */
1438 int warn_return_type
;
1440 /* Nonzero means warn about pointer casts that increase the required
1441 alignment of the target type (and might therefore lead to a crash
1442 due to a misaligned access). */
1444 int warn_cast_align
;
1446 /* Nonzero means warn about any objects definitions whose size is larger
1447 than N bytes. Also want about function definitions whose returned
1448 values are larger than N bytes. The value N is in `larger_than_size'. */
1450 int warn_larger_than
;
1451 HOST_WIDE_INT larger_than_size
;
1453 /* Nonzero means warn if inline function is too large. */
1457 /* Warn if a function returns an aggregate,
1458 since there are often incompatible calling conventions for doing this. */
1460 int warn_aggregate_return
;
1462 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1466 /* Warn when gcc pads a structure to an alignment boundary. */
1470 /* Warn when an optimization pass is disabled. */
1472 int warn_disabled_optimization
;
1474 /* Warn about functions which might be candidates for attribute noreturn. */
1476 int warn_missing_noreturn
;
1478 /* Nonzero means warn about uses of __attribute__((deprecated))
1481 int warn_deprecated_decl
= 1;
1483 /* Likewise for -W. */
1485 static const lang_independent_options W_options
[] =
1487 {"unused-function", &warn_unused_function
, 1,
1488 N_("Warn when a function is unused") },
1489 {"unused-label", &warn_unused_label
, 1,
1490 N_("Warn when a label is unused") },
1491 {"unused-parameter", &warn_unused_parameter
, 1,
1492 N_("Warn when a function parameter is unused") },
1493 {"unused-variable", &warn_unused_variable
, 1,
1494 N_("Warn when a variable is unused") },
1495 {"unused-value", &warn_unused_value
, 1,
1496 N_("Warn when an expression value is unused") },
1497 {"system-headers", &warn_system_headers
, 1,
1498 N_("Do not suppress warnings from system headers") },
1499 {"error", &warnings_are_errors
, 1,
1500 N_("Treat all warnings as errors") },
1501 {"shadow", &warn_shadow
, 1,
1502 N_("Warn when one local variable shadows another") },
1503 {"switch", &warn_switch
, 1,
1504 N_("Warn about enumerated switches, with no default, missing a case") },
1505 {"switch-default", &warn_switch_default
, 1,
1506 N_("Warn about enumerated switches missing a default case") },
1507 {"switch-enum", &warn_switch_enum
, 1,
1508 N_("Warn about all enumerated switches missing a specific case") },
1509 {"aggregate-return", &warn_aggregate_return
, 1,
1510 N_("Warn about returning structures, unions or arrays") },
1511 {"cast-align", &warn_cast_align
, 1,
1512 N_("Warn about pointer casts which increase alignment") },
1513 {"unreachable-code", &warn_notreached
, 1,
1514 N_("Warn about code that will never be executed") },
1515 {"uninitialized", &warn_uninitialized
, 1,
1516 N_("Warn about uninitialized automatic variables") },
1517 {"inline", &warn_inline
, 1,
1518 N_("Warn when an inlined function cannot be inlined") },
1519 {"packed", &warn_packed
, 1,
1520 N_("Warn when the packed attribute has no effect on struct layout") },
1521 {"padded", &warn_padded
, 1,
1522 N_("Warn when padding is required to align struct members") },
1523 {"disabled-optimization", &warn_disabled_optimization
, 1,
1524 N_("Warn when an optimization pass is disabled") },
1525 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1526 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1527 {"missing-noreturn", &warn_missing_noreturn
, 1,
1528 N_("Warn about functions which might be candidates for attribute noreturn") }
1532 set_Wunused (setting
)
1535 warn_unused_function
= setting
;
1536 warn_unused_label
= setting
;
1537 /* Unused function parameter warnings are reported when either ``-W
1538 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1539 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1541 warn_unused_parameter
= 0;
1542 else if (!warn_unused_parameter
)
1543 warn_unused_parameter
= -1;
1544 warn_unused_variable
= setting
;
1545 warn_unused_value
= setting
;
1548 /* The following routines are useful in setting all the flags that
1549 -ffast-math and -fno-fast-math imply. */
1552 set_fast_math_flags (int set
)
1554 flag_trapping_math
= !set
;
1555 flag_unsafe_math_optimizations
= set
;
1556 flag_errno_math
= !set
;
1559 /* Return true iff flags are set as if -ffast-math. */
1561 fast_math_flags_set_p ()
1563 return (!flag_trapping_math
1564 && flag_unsafe_math_optimizations
1565 && !flag_errno_math
);
1569 /* Output files for assembler code (real compiler output)
1570 and debugging dumps. */
1573 FILE *aux_info_file
;
1574 FILE *rtl_dump_file
= NULL
;
1576 /* Decode the string P as an integral parameter.
1577 If the string is indeed an integer return its numeric value else
1578 issue an Invalid Option error for the option PNAME and return DEFVAL.
1579 If PNAME is zero just return DEFVAL, do not call error. */
1582 read_integral_parameter (p
, pname
, defval
)
1587 const char *endp
= p
;
1591 if (ISDIGIT (*endp
))
1600 error ("invalid option `%s'", pname
);
1607 /* This calls abort and is used to avoid problems when abort if a macro.
1608 It is used when we need to pass the address of abort. */
1616 /* When `malloc.c' is compiled with `rcheck' defined,
1617 it calls this function to report clobberage. */
1621 const char *s ATTRIBUTE_UNUSED
;
1626 /* Return the logarithm of X, base 2, considering X unsigned,
1627 if X is a power of 2. Otherwise, returns -1.
1629 This should be used via the `exact_log2' macro. */
1633 unsigned HOST_WIDE_INT x
;
1636 /* Test for 0 or a power of 2. */
1637 if (x
== 0 || x
!= (x
& -x
))
1639 while ((x
>>= 1) != 0)
1644 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1645 If X is 0, return -1.
1647 This should be used via the floor_log2 macro. */
1651 unsigned HOST_WIDE_INT x
;
1660 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1661 into ICE messages, which is much more user friendly. */
1664 crash_signal (signo
)
1667 internal_error ("internal error: %s", strsignal (signo
));
1670 /* Strip off a legitimate source ending from the input string NAME of
1671 length LEN. Rather than having to know the names used by all of
1672 our front ends, we strip off an ending of a period followed by
1673 up to five characters. (Java uses ".class".) */
1676 strip_off_ending (name
, len
)
1681 for (i
= 2; i
< 6 && len
> i
; i
++)
1683 if (name
[len
- i
] == '.')
1685 name
[len
- i
] = '\0';
1691 /* Output a quoted string. */
1694 output_quoted_string (asm_file
, string
)
1698 #ifdef OUTPUT_QUOTED_STRING
1699 OUTPUT_QUOTED_STRING (asm_file
, string
);
1703 putc ('\"', asm_file
);
1704 while ((c
= *string
++) != 0)
1708 if (c
== '\"' || c
== '\\')
1709 putc ('\\', asm_file
);
1713 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1715 putc ('\"', asm_file
);
1719 /* Output NAME into FILE after having turned it into something
1720 usable as an identifier in a target's assembly file. */
1722 output_clean_symbol_name (file
, name
)
1726 /* Make a copy of NAME. */
1727 char *id
= xstrdup (name
);
1729 /* Make it look like a valid identifier for an assembler. */
1730 clean_symbol_name (id
);
1737 /* Output a file name in the form wanted by System V. */
1740 output_file_directive (asm_file
, input_name
)
1742 const char *input_name
;
1744 int len
= strlen (input_name
);
1745 const char *na
= input_name
+ len
;
1747 /* NA gets INPUT_NAME sans directory names. */
1748 while (na
> input_name
)
1750 if (IS_DIR_SEPARATOR (na
[-1]))
1755 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1756 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1758 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1759 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1761 fprintf (asm_file
, "\t.file\t");
1762 output_quoted_string (asm_file
, na
);
1763 fputc ('\n', asm_file
);
1768 /* Routine to open a dump file. Return true if the dump file is enabled. */
1771 open_dump_file (index
, decl
)
1772 enum dump_file_index index
;
1776 const char *open_arg
;
1779 if (! dump_file
[index
].enabled
)
1782 timevar_push (TV_DUMP
);
1783 if (rtl_dump_file
!= NULL
)
1784 fclose (rtl_dump_file
);
1786 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1788 if (! dump_file
[index
].initialized
)
1790 /* If we've not initialized the files, do so now. */
1791 if (graph_dump_format
!= no_graph
1792 && dump_file
[index
].graph_dump_p
)
1794 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1795 clean_graph_dump_file (dump_base_name
, dump_name
);
1798 dump_file
[index
].initialized
= 1;
1804 dump_name
= concat (dump_base_name
, seq
,
1805 dump_file
[index
].extension
, NULL
);
1807 rtl_dump_file
= fopen (dump_name
, open_arg
);
1808 if (rtl_dump_file
== NULL
)
1809 fatal_io_error ("can't open %s", dump_name
);
1814 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1815 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1816 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1818 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1819 ? " (unlikely executed)"
1822 timevar_pop (TV_DUMP
);
1826 /* Routine to close a dump file. */
1829 close_dump_file (index
, func
, insns
)
1830 enum dump_file_index index
;
1831 void (*func
) PARAMS ((FILE *, rtx
));
1834 if (! rtl_dump_file
)
1837 timevar_push (TV_DUMP
);
1839 && graph_dump_format
!= no_graph
1840 && dump_file
[index
].graph_dump_p
)
1845 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1846 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1847 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1852 func (rtl_dump_file
, insns
);
1854 fflush (rtl_dump_file
);
1855 fclose (rtl_dump_file
);
1857 rtl_dump_file
= NULL
;
1858 timevar_pop (TV_DUMP
);
1861 /* Do any final processing required for the declarations in VEC, of
1862 which there are LEN. We write out inline functions and variables
1863 that have been deferred until this point, but which are required.
1864 Returns non-zero if anything was put out. */
1867 wrapup_global_declarations (vec
, len
)
1874 int output_something
= 0;
1876 for (i
= 0; i
< len
; i
++)
1880 /* We're not deferring this any longer. */
1881 DECL_DEFER_OUTPUT (decl
) = 0;
1883 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1884 (*lang_hooks
.finish_incomplete_decl
) (decl
);
1887 /* Now emit any global variables or functions that we have been
1888 putting off. We need to loop in case one of the things emitted
1889 here references another one which comes earlier in the list. */
1893 for (i
= 0; i
< len
; i
++)
1897 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1900 /* Don't write out static consts, unless we still need them.
1902 We also keep static consts if not optimizing (for debugging),
1903 unless the user specified -fno-keep-static-consts.
1904 ??? They might be better written into the debug information.
1905 This is possible when using DWARF.
1907 A language processor that wants static constants to be always
1908 written out (even if it is not used) is responsible for
1909 calling rest_of_decl_compilation itself. E.g. the C front-end
1910 calls rest_of_decl_compilation from finish_decl.
1911 One motivation for this is that is conventional in some
1912 environments to write things like:
1913 static const char rcsid[] = "... version string ...";
1914 intending to force the string to be in the executable.
1916 A language processor that would prefer to have unneeded
1917 static constants "optimized away" would just defer writing
1918 them out until here. E.g. C++ does this, because static
1919 constants are often defined in header files.
1921 ??? A tempting alternative (for both C and C++) would be
1922 to force a constant to be written if and only if it is
1923 defined in a main file, as opposed to an include file. */
1925 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1929 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1931 else if (DECL_COMDAT (decl
))
1933 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1934 && (optimize
|| !flag_keep_static_consts
1935 || DECL_ARTIFICIAL (decl
)))
1941 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1945 if (TREE_CODE (decl
) == FUNCTION_DECL
1946 && DECL_INITIAL (decl
) != 0
1947 && DECL_SAVED_INSNS (decl
) != 0
1948 && (flag_keep_inline_functions
1949 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1950 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1953 output_inline_function (decl
);
1958 output_something
= 1;
1962 return output_something
;
1965 /* Issue appropriate warnings for the global declarations in VEC (of
1966 which there are LEN). Output debugging information for them. */
1969 check_global_declarations (vec
, len
)
1976 for (i
= 0; i
< len
; i
++)
1980 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1981 && ! TREE_ASM_WRITTEN (decl
))
1982 /* Cancel the RTL for this decl so that, if debugging info
1983 output for global variables is still to come,
1984 this one will be omitted. */
1985 SET_DECL_RTL (decl
, NULL_RTX
);
1987 /* Warn about any function
1988 declared static but not defined.
1989 We don't warn about variables,
1990 because many programs have static variables
1991 that exist only to get some text into the object file. */
1992 if (TREE_CODE (decl
) == FUNCTION_DECL
1993 && (warn_unused_function
1994 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1995 && DECL_INITIAL (decl
) == 0
1996 && DECL_EXTERNAL (decl
)
1997 && ! DECL_ARTIFICIAL (decl
)
1998 && ! TREE_PUBLIC (decl
))
2000 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2001 pedwarn_with_decl (decl
,
2002 "`%s' used but never defined");
2004 warning_with_decl (decl
,
2005 "`%s' declared `static' but never defined");
2006 /* This symbol is effectively an "extern" declaration now. */
2007 TREE_PUBLIC (decl
) = 1;
2008 assemble_external (decl
);
2011 /* Warn about static fns or vars defined but not used. */
2012 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
2013 || (warn_unused_variable
&& TREE_CODE (decl
) == VAR_DECL
))
2014 && ! TREE_USED (decl
)
2015 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2016 to handle multiple external decls in different scopes. */
2017 && ! TREE_USED (DECL_NAME (decl
))
2018 && ! DECL_EXTERNAL (decl
)
2019 && ! TREE_PUBLIC (decl
)
2020 /* Global register variables must be declared to reserve them. */
2021 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
2022 /* Otherwise, ask the language. */
2023 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
2024 warning_with_decl (decl
, "`%s' defined but not used");
2026 timevar_push (TV_SYMOUT
);
2027 (*debug_hooks
->global_decl
) (decl
);
2028 timevar_pop (TV_SYMOUT
);
2032 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2033 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2034 INPUT_FILENAME and LINENO accordingly. */
2037 push_srcloc (file
, line
)
2041 struct file_stack
*fs
;
2043 if (input_file_stack
)
2045 input_file_stack
->name
= input_filename
;
2046 input_file_stack
->line
= lineno
;
2049 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2050 fs
->name
= input_filename
= file
;
2051 fs
->line
= lineno
= line
;
2052 fs
->next
= input_file_stack
;
2053 input_file_stack
= fs
;
2054 input_file_stack_tick
++;
2057 /* Pop the top entry off the stack of presently open source files.
2058 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2064 struct file_stack
*fs
;
2066 fs
= input_file_stack
;
2067 input_file_stack
= fs
->next
;
2069 input_file_stack_tick
++;
2070 /* The initial source file is never popped. */
2071 if (!input_file_stack
)
2073 input_filename
= input_file_stack
->name
;
2074 lineno
= input_file_stack
->line
;
2077 /* Compile an entire translation unit. Write a file of assembly
2078 output and various debugging dumps. */
2085 /* Initialize yet another pass. */
2087 init_final (main_input_filename
);
2088 init_branch_prob (dump_base_name
);
2090 timevar_push (TV_PARSE
);
2092 /* Call the parser, which parses the entire file (calling
2093 rest_of_compilation for each function). */
2094 (*lang_hooks
.parse_file
) (set_yydebug
);
2096 /* In case there were missing block closers,
2097 get us back to the global binding level. */
2098 (*lang_hooks
.clear_binding_stack
) ();
2100 /* Compilation is now finished except for writing
2101 what's left of the symbol table output. */
2102 timevar_pop (TV_PARSE
);
2104 if (flag_syntax_only
)
2107 globals
= (*lang_hooks
.decls
.getdecls
) ();
2109 /* Really define vars that have had only a tentative definition.
2110 Really output inline functions that must actually be callable
2111 and have not been output so far. */
2114 int len
= list_length (globals
);
2115 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2119 /* Process the decls in reverse order--earliest first.
2120 Put them into VEC from back to front, then take out from front. */
2122 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2123 vec
[len
- i
- 1] = decl
;
2125 wrapup_global_declarations (vec
, len
);
2127 /* This must occur after the loop to output deferred functions. Else
2128 the profiler initializer would not be emitted if all the functions
2129 in this compilation unit were deferred.
2131 output_func_start_profiler can not cause any additional functions or
2132 data to need to be output, so it need not be in the deferred function
2134 output_func_start_profiler ();
2136 check_global_declarations (vec
, len
);
2142 /* Write out any pending weak symbol declarations. */
2146 /* Do dbx symbols. */
2147 timevar_push (TV_SYMOUT
);
2149 #ifdef DWARF2_UNWIND_INFO
2150 if (dwarf2out_do_frame ())
2151 dwarf2out_frame_finish ();
2154 (*debug_hooks
->finish
) (main_input_filename
);
2155 timevar_pop (TV_SYMOUT
);
2157 /* Output some stuff at end of file if nec. */
2159 dw2_output_indirect_constants ();
2161 end_final (dump_base_name
);
2163 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2165 timevar_push (TV_DUMP
);
2166 open_dump_file (DFI_bp
, NULL
);
2170 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2171 timevar_pop (TV_DUMP
);
2175 ASM_FILE_END (asm_out_file
);
2178 /* Attach a special .ident directive to the end of the file to identify
2179 the version of GCC which compiled this code. The format of the .ident
2180 string is patterned after the ones produced by native SVR4 compilers. */
2183 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2184 IDENT_ASM_OP
, version_string
);
2187 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2189 timevar_push (TV_DUMP
);
2190 dump_combine_total_stats (rtl_dump_file
);
2191 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2192 timevar_pop (TV_DUMP
);
2196 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2197 and TYPE_DECL nodes.
2199 This does nothing for local (non-static) variables, unless the
2200 variable is a register variable with an ASMSPEC. In that case, or
2201 if the variable is not an automatic, it sets up the RTL and
2202 outputs any assembler code (label definition, storage allocation
2203 and initialization).
2205 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2206 the assembler symbol name to be used. TOP_LEVEL is nonzero
2207 if this declaration is not within a function. */
2210 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2212 const char *asmspec
;
2216 /* Declarations of variables, and of functions defined elsewhere. */
2218 /* The most obvious approach, to put an #ifndef around where
2219 this macro is used, doesn't work since it's inside a macro call. */
2220 #ifndef ASM_FINISH_DECLARE_OBJECT
2221 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2224 /* We deferred calling assemble_alias so that we could collect
2225 other attributes such as visibility. Emit the alias now. */
2228 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2231 alias
= TREE_VALUE (TREE_VALUE (alias
));
2232 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2233 assemble_alias (decl
, alias
);
2237 /* Forward declarations for nested functions are not "external",
2238 but we need to treat them as if they were. */
2239 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2240 || TREE_CODE (decl
) == FUNCTION_DECL
)
2242 timevar_push (TV_VARCONST
);
2245 make_decl_rtl (decl
, asmspec
);
2247 /* Don't output anything when a tentative file-scope definition
2248 is seen. But at end of compilation, do output code for them. */
2249 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2250 assemble_variable (decl
, top_level
, at_end
, 0);
2251 if (decl
== last_assemble_variable_decl
)
2253 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2257 timevar_pop (TV_VARCONST
);
2259 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2261 if (decode_reg_name (asmspec
) >= 0)
2263 SET_DECL_RTL (decl
, NULL_RTX
);
2264 make_decl_rtl (decl
, asmspec
);
2268 error ("invalid register name `%s' for register variable", asmspec
);
2269 DECL_REGISTER (decl
) = 0;
2274 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2275 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2276 && TREE_CODE (decl
) == TYPE_DECL
)
2278 timevar_push (TV_SYMOUT
);
2279 dbxout_symbol (decl
, 0);
2280 timevar_pop (TV_SYMOUT
);
2283 #ifdef SDB_DEBUGGING_INFO
2284 else if (write_symbols
== SDB_DEBUG
&& top_level
2285 && TREE_CODE (decl
) == TYPE_DECL
)
2287 timevar_push (TV_SYMOUT
);
2288 sdbout_symbol (decl
, 0);
2289 timevar_pop (TV_SYMOUT
);
2294 /* Called after finishing a record, union or enumeral type. */
2297 rest_of_type_compilation (type
, toplev
)
2298 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2302 tree type ATTRIBUTE_UNUSED
;
2303 int toplev ATTRIBUTE_UNUSED
;
2306 timevar_push (TV_SYMOUT
);
2307 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2308 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2309 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2311 #ifdef SDB_DEBUGGING_INFO
2312 if (write_symbols
== SDB_DEBUG
)
2313 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2315 #ifdef DWARF2_DEBUGGING_INFO
2316 if ((write_symbols
== DWARF2_DEBUG
2317 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2319 dwarf2out_decl (TYPE_STUB_DECL (type
));
2321 timevar_pop (TV_SYMOUT
);
2324 /* This is called from finish_function (within langhooks.parse_file)
2325 after each top-level definition is parsed.
2326 It is supposed to compile that function or variable
2327 and output the assembler code for it.
2328 After we return, the tree storage is freed. */
2331 rest_of_compilation (decl
)
2337 int rebuild_label_notes_after_reload
;
2338 int register_life_up_to_date
;
2340 timevar_push (TV_REST_OF_COMPILATION
);
2342 /* Now that we're out of the frontend, we shouldn't have any more
2343 CONCATs anywhere. */
2344 generating_concat_p
= 0;
2346 /* When processing delayed functions, prepare_function_start() won't
2347 have been run to re-initialize it. */
2348 cse_not_expected
= ! optimize
;
2350 /* First, make sure that NOTE_BLOCK is set correctly for each
2351 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2352 if (!cfun
->x_whole_function_mode_p
)
2355 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2356 tree in sensible shape. So, we just recalculate it here. */
2357 if (cfun
->x_whole_function_mode_p
)
2362 /* If we are reconsidering an inline function
2363 at the end of compilation, skip the stuff for making it inline. */
2365 if (DECL_SAVED_INSNS (decl
) == 0)
2371 /* If this is nested inside an inlined external function, pretend
2372 it was only declared. Since we cannot inline such functions,
2373 generating code for this one is not only not necessary but will
2374 confuse some debugging output writers. */
2375 for (parent
= DECL_CONTEXT (current_function_decl
);
2376 parent
!= NULL_TREE
;
2377 parent
= get_containing_scope (parent
))
2378 if (TREE_CODE (parent
) == FUNCTION_DECL
2379 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2381 DECL_INITIAL (decl
) = 0;
2382 goto exit_rest_of_compilation
;
2385 /* If requested, consider whether to make this function inline. */
2386 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2387 || flag_inline_functions
)
2389 timevar_push (TV_INTEGRATION
);
2390 lose
= function_cannot_inline_p (decl
);
2391 timevar_pop (TV_INTEGRATION
);
2392 if (lose
|| ! optimize
)
2394 if (warn_inline
&& DECL_INLINE (decl
))
2395 warning_with_decl (decl
, lose
);
2396 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2397 /* Don't really compile an extern inline function.
2398 If we can't make it inline, pretend
2399 it was only declared. */
2400 if (DECL_EXTERNAL (decl
))
2402 DECL_INITIAL (decl
) = 0;
2403 goto exit_rest_of_compilation
;
2407 /* ??? Note that this has the effect of making it look
2408 like "inline" was specified for a function if we choose
2409 to inline it. This isn't quite right, but it's
2410 probably not worth the trouble to fix. */
2411 inlinable
= DECL_INLINE (decl
) = 1;
2414 insns
= get_insns ();
2416 /* Dump the rtl code if we are dumping rtl. */
2418 if (open_dump_file (DFI_rtl
, decl
))
2420 if (DECL_SAVED_INSNS (decl
))
2421 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2422 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2425 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2426 sorts of eh initialization. Delay this until after the
2427 initial rtl dump so that we can see the original nesting. */
2428 convert_from_eh_region_ranges ();
2430 /* If function is inline, and we don't yet know whether to
2431 compile it by itself, defer decision till end of compilation.
2432 finish_compilation will call rest_of_compilation again
2433 for those functions that need to be output. Also defer those
2434 functions that we are supposed to defer. */
2437 || (DECL_INLINE (decl
)
2438 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2439 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2440 && ! flag_keep_inline_functions
)
2441 || DECL_EXTERNAL (decl
))))
2442 DECL_DEFER_OUTPUT (decl
) = 1;
2444 if (DECL_INLINE (decl
))
2445 /* DWARF wants separate debugging info for abstract and
2446 concrete instances of all inline functions, including those
2447 declared inline but not inlined, and those inlined even
2448 though they weren't declared inline. Conveniently, that's
2449 what DECL_INLINE means at this point. */
2450 (*debug_hooks
->deferred_inline_function
) (decl
);
2452 if (DECL_DEFER_OUTPUT (decl
))
2454 /* If -Wreturn-type, we have to do a bit of compilation. We just
2455 want to call cleanup the cfg to figure out whether or not we can
2456 fall off the end of the function; we do the minimum amount of
2457 work necessary to make that safe. */
2458 if (warn_return_type
)
2460 int saved_optimize
= optimize
;
2463 rebuild_jump_labels (insns
);
2464 find_exception_handler_labels ();
2465 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2466 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2467 optimize
= saved_optimize
;
2469 /* CFG is no longer maintained up-to-date. */
2470 free_bb_for_insn ();
2473 current_function_nothrow
= nothrow_function_p ();
2474 if (current_function_nothrow
)
2475 /* Now we know that this can't throw; set the flag for the benefit
2476 of other functions later in this translation unit. */
2477 TREE_NOTHROW (current_function_decl
) = 1;
2479 timevar_push (TV_INTEGRATION
);
2480 save_for_inline (decl
);
2481 timevar_pop (TV_INTEGRATION
);
2482 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2483 goto exit_rest_of_compilation
;
2486 /* If specified extern inline but we aren't inlining it, we are
2487 done. This goes for anything that gets here with DECL_EXTERNAL
2488 set, not just things with DECL_INLINE. */
2489 if (DECL_EXTERNAL (decl
))
2490 goto exit_rest_of_compilation
;
2493 /* If we're emitting a nested function, make sure its parent gets
2494 emitted as well. Doing otherwise confuses debug info. */
2497 for (parent
= DECL_CONTEXT (current_function_decl
);
2498 parent
!= NULL_TREE
;
2499 parent
= get_containing_scope (parent
))
2500 if (TREE_CODE (parent
) == FUNCTION_DECL
)
2501 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
2504 /* We are now committed to emitting code for this function. Do any
2505 preparation, such as emitting abstract debug info for the inline
2506 before it gets mangled by optimization. */
2507 if (DECL_INLINE (decl
))
2508 (*debug_hooks
->outlining_inline_function
) (decl
);
2510 /* Remove any notes we don't need. That will make iterating
2511 over the instruction sequence faster, and allow the garbage
2512 collector to reclaim the memory used by the notes. */
2513 remove_unnecessary_notes ();
2518 /* Initialize some variables used by the optimizers. */
2519 init_function_for_compilation ();
2521 if (! DECL_DEFER_OUTPUT (decl
))
2522 TREE_ASM_WRITTEN (decl
) = 1;
2524 /* Now that integrate will no longer see our rtl, we need not
2525 distinguish between the return value of this function and the
2526 return value of called functions. Also, we can remove all SETs
2527 of subregs of hard registers; they are only here because of
2528 integrate. Also, we can now initialize pseudos intended to
2529 carry magic hard reg data throughout the function. */
2530 rtx_equal_function_value_matters
= 0;
2531 purge_hard_subreg_sets (get_insns ());
2533 /* Early return if there were errors. We can run afoul of our
2534 consistency checks, and there's not really much point in fixing them.
2535 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2536 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2537 || errorcount
|| sorrycount
)
2538 goto exit_rest_of_compilation
;
2540 timevar_push (TV_JUMP
);
2541 open_dump_file (DFI_sibling
, decl
);
2542 insns
= get_insns ();
2543 rebuild_jump_labels (insns
);
2544 find_exception_handler_labels ();
2545 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2547 delete_unreachable_blocks ();
2549 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2550 note_prediction_to_br_prob ();
2552 /* We may have potential sibling or tail recursion sites. Select one
2553 (of possibly multiple) methods of performing the call. */
2554 if (flag_optimize_sibling_calls
)
2557 optimize_sibling_and_tail_recursive_calls ();
2559 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2560 free_bb_for_insn ();
2561 find_exception_handler_labels ();
2562 rebuild_jump_labels (insns
);
2563 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2565 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2566 notes before simplifying cfg and we must do lowering after sibcall
2567 that unhides parts of RTL chain and cleans up the CFG.
2569 Until sibcall is replaced by tree-level optimizer, lets just
2570 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2571 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2572 if (GET_CODE (insn
) == NOTE
2573 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2576 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2577 timevar_pop (TV_JUMP
);
2579 scope_to_insns_initialize ();
2580 /* Complete generation of exception handling code. */
2583 timevar_push (TV_JUMP
);
2584 open_dump_file (DFI_eh
, decl
);
2586 finish_eh_generation ();
2588 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2589 timevar_pop (TV_JUMP
);
2592 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2593 generation, which might create new sets. */
2594 emit_initial_value_sets ();
2597 /* If we are doing position-independent code generation, now
2598 is the time to output special prologues and epilogues.
2599 We do not want to do this earlier, because it just clutters
2600 up inline functions with meaningless insns. */
2605 insns
= get_insns ();
2607 /* Copy any shared structure that should not be shared. */
2608 unshare_all_rtl (current_function_decl
, insns
);
2610 #ifdef SETJMP_VIA_SAVE_AREA
2611 /* This must be performed before virtual register instantiation.
2612 Please be aware the everything in the compiler that can look
2613 at the RTL up to this point must understand that REG_SAVE_AREA
2614 is just like a use of the REG contained inside. */
2615 if (current_function_calls_alloca
)
2616 optimize_save_area_alloca (insns
);
2619 /* Instantiate all virtual registers. */
2620 instantiate_virtual_regs (current_function_decl
, insns
);
2622 open_dump_file (DFI_jump
, decl
);
2624 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2625 are initialized and to compute whether control can drop off the end
2628 timevar_push (TV_JUMP
);
2629 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2630 before jump optimization switches branch directions. */
2631 expected_value_to_br_prob ();
2633 reg_scan (insns
, max_reg_num (), 0);
2634 rebuild_jump_labels (insns
);
2635 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2637 dump_flow_info (rtl_dump_file
);
2638 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
2639 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2641 /* CFG is no longer maintained up-to-date. */
2642 free_bb_for_insn ();
2643 copy_loop_headers (insns
);
2644 purge_line_number_notes (insns
);
2645 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2647 timevar_pop (TV_JUMP
);
2648 close_dump_file (DFI_jump
, print_rtl
, insns
);
2650 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2651 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2653 goto exit_rest_of_compilation
;
2656 /* Long term, this should probably move before the jump optimizer too,
2657 but I didn't want to disturb the rtl_dump_and_exit and related
2658 stuff at this time. */
2659 if (optimize
> 0 && flag_ssa
)
2661 /* Convert to SSA form. */
2663 timevar_push (TV_TO_SSA
);
2664 open_dump_file (DFI_ssa
, decl
);
2666 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2669 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2670 timevar_pop (TV_TO_SSA
);
2672 /* Perform sparse conditional constant propagation, if requested. */
2675 timevar_push (TV_SSA_CCP
);
2676 open_dump_file (DFI_ssa_ccp
, decl
);
2680 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2681 timevar_pop (TV_SSA_CCP
);
2684 /* It would be useful to cleanup the CFG at this point, but block
2685 merging and possibly other transformations might leave a PHI
2686 node in the middle of a basic block, which is a strict no-no. */
2688 /* The SSA implementation uses basic block numbers in its phi
2689 nodes. Thus, changing the control-flow graph or the basic
2690 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2691 may cause problems. */
2695 /* Remove dead code. */
2697 timevar_push (TV_SSA_DCE
);
2698 open_dump_file (DFI_ssa_dce
, decl
);
2700 insns
= get_insns ();
2701 ssa_eliminate_dead_code ();
2703 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2704 timevar_pop (TV_SSA_DCE
);
2707 /* Convert from SSA form. */
2709 timevar_push (TV_FROM_SSA
);
2710 open_dump_file (DFI_ussa
, decl
);
2712 convert_from_ssa ();
2713 /* New registers have been created. Rescan their usage. */
2714 reg_scan (insns
, max_reg_num (), 1);
2716 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2717 timevar_pop (TV_FROM_SSA
);
2722 timevar_push (TV_JUMP
);
2724 if (flag_delete_null_pointer_checks
|| flag_if_conversion
)
2726 open_dump_file (DFI_null
, decl
);
2728 dump_flow_info (rtl_dump_file
);
2729 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2731 /* Try to identify useless null pointer tests and delete them. */
2732 if (flag_delete_null_pointer_checks
)
2733 delete_null_pointer_checks (insns
);
2735 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2736 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2739 /* Jump optimization, and the removal of NULL pointer checks, may
2740 have reduced the number of instructions substantially. CSE, and
2741 future passes, allocate arrays whose dimensions involve the
2742 maximum instruction UID, so if we can reduce the maximum UID
2743 we'll save big on memory. */
2744 renumber_insns (rtl_dump_file
);
2745 timevar_pop (TV_JUMP
);
2747 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
2751 /* Perform common subexpression elimination.
2752 Nonzero value from `cse_main' means that jumps were simplified
2753 and some code may now be unreachable, so do
2754 jump optimization again. */
2758 open_dump_file (DFI_cse
, decl
);
2760 dump_flow_info (rtl_dump_file
);
2761 timevar_push (TV_CSE
);
2763 reg_scan (insns
, max_reg_num (), 1);
2765 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2767 rebuild_jump_labels (insns
);
2768 purge_all_dead_edges (0);
2770 delete_trivially_dead_insns (insns
, max_reg_num ());
2772 /* If we are not running more CSE passes, then we are no longer
2773 expecting CSE to be run. But always rerun it in a cheap mode. */
2774 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2776 if (tem
|| optimize
> 1)
2777 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2778 /* Try to identify useless null pointer tests and delete them. */
2779 if (flag_delete_null_pointer_checks
|| flag_thread_jumps
)
2781 timevar_push (TV_JUMP
);
2783 if (flag_delete_null_pointer_checks
)
2784 delete_null_pointer_checks (insns
);
2785 /* CFG is no longer maintained up-to-date. */
2786 timevar_pop (TV_JUMP
);
2789 /* The second pass of jump optimization is likely to have
2790 removed a bunch more instructions. */
2791 renumber_insns (rtl_dump_file
);
2793 timevar_pop (TV_CSE
);
2794 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2797 open_dump_file (DFI_addressof
, decl
);
2799 purge_addressof (insns
);
2801 purge_all_dead_edges (0);
2802 reg_scan (insns
, max_reg_num (), 1);
2804 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2808 /* Perform global cse. */
2810 if (optimize
> 0 && flag_gcse
)
2812 int save_csb
, save_cfj
;
2815 timevar_push (TV_GCSE
);
2816 open_dump_file (DFI_gcse
, decl
);
2818 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2819 tem
= gcse_main (insns
, rtl_dump_file
);
2820 rebuild_jump_labels (insns
);
2821 delete_trivially_dead_insns (insns
, max_reg_num ());
2823 save_csb
= flag_cse_skip_blocks
;
2824 save_cfj
= flag_cse_follow_jumps
;
2825 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2827 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2829 if (flag_expensive_optimizations
)
2831 timevar_push (TV_CSE
);
2832 reg_scan (insns
, max_reg_num (), 1);
2833 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2834 purge_all_dead_edges (0);
2835 delete_trivially_dead_insns (insns
, max_reg_num ());
2836 timevar_pop (TV_CSE
);
2837 cse_not_expected
= !flag_rerun_cse_after_loop
;
2840 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2841 things up. Then possibly re-run CSE again. */
2845 timevar_push (TV_JUMP
);
2846 rebuild_jump_labels (insns
);
2847 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2848 timevar_pop (TV_JUMP
);
2850 if (flag_expensive_optimizations
)
2852 timevar_push (TV_CSE
);
2853 reg_scan (insns
, max_reg_num (), 1);
2854 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2855 purge_all_dead_edges (0);
2856 delete_trivially_dead_insns (insns
, max_reg_num ());
2857 timevar_pop (TV_CSE
);
2861 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2862 timevar_pop (TV_GCSE
);
2865 flag_cse_skip_blocks
= save_csb
;
2866 flag_cse_follow_jumps
= save_cfj
;
2867 #ifdef ENABLE_CHECKING
2868 verify_flow_info ();
2872 /* Move constant computations out of loops. */
2874 if (optimize
> 0 && flag_loop_optimize
)
2876 timevar_push (TV_LOOP
);
2877 delete_dead_jumptables ();
2878 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2879 open_dump_file (DFI_loop
, decl
);
2880 /* CFG is no longer maintained up-to-date. */
2881 free_bb_for_insn ();
2883 if (flag_rerun_loop_opt
)
2885 cleanup_barriers ();
2887 /* We only want to perform unrolling once. */
2888 loop_optimize (insns
, rtl_dump_file
, LOOP_FIRST_PASS
);
2890 /* The first call to loop_optimize makes some instructions
2891 trivially dead. We delete those instructions now in the
2892 hope that doing so will make the heuristics in loop work
2893 better and possibly speed up compilation. */
2894 delete_trivially_dead_insns (insns
, max_reg_num ());
2896 /* The regscan pass is currently necessary as the alias
2897 analysis code depends on this information. */
2898 reg_scan (insns
, max_reg_num (), 1);
2900 cleanup_barriers ();
2901 loop_optimize (insns
, rtl_dump_file
,
2902 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
2903 | (flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0));
2905 /* Loop can create trivially dead instructions. */
2906 delete_trivially_dead_insns (insns
, max_reg_num ());
2907 close_dump_file (DFI_loop
, print_rtl
, insns
);
2908 timevar_pop (TV_LOOP
);
2909 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2914 /* Do control and data flow analysis; wrote some of the results to
2917 timevar_push (TV_FLOW
);
2918 open_dump_file (DFI_cfg
, decl
);
2920 dump_flow_info (rtl_dump_file
);
2921 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0)
2922 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2924 /* It may make more sense to mark constant functions after dead code is
2925 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2926 may insert code making function non-constant, but we still must consider
2927 it as constant, otherwise -fbranch-probabilities will not read data back.
2929 life_analyzis rarely eliminates modification of external memory.
2932 mark_constant_function ();
2934 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2936 /* Do branch profiling and static profile estimation passes. */
2937 if (optimize
> 0 || cfun
->arc_profile
|| flag_branch_probabilities
)
2941 timevar_push (TV_BRANCH_PROB
);
2942 open_dump_file (DFI_bp
, decl
);
2943 if (cfun
->arc_profile
|| flag_branch_probabilities
)
2946 /* Discover and record the loop depth at the head of each basic
2947 block. The loop infrastructure does the real job for us. */
2948 flow_loops_find (&loops
, LOOP_TREE
);
2950 /* Estimate using heuristics if no profiling info is available. */
2951 if (flag_guess_branch_prob
)
2952 estimate_probability (&loops
);
2955 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2957 flow_loops_free (&loops
);
2958 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2959 timevar_pop (TV_BRANCH_PROB
);
2963 timevar_push (TV_TRACER
);
2964 open_dump_file (DFI_tracer
, decl
);
2966 dump_flow_info (rtl_dump_file
);
2967 cleanup_cfg (CLEANUP_EXPENSIVE
);
2969 cleanup_cfg (CLEANUP_EXPENSIVE
);
2970 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
2971 timevar_pop (TV_TRACER
);
2972 reg_scan (get_insns (), max_reg_num (), 0);
2977 timevar_push (TV_CSE2
);
2978 open_dump_file (DFI_cse2
, decl
);
2980 dump_flow_info (rtl_dump_file
);
2982 if (flag_rerun_cse_after_loop
)
2984 timevar_push (TV_JUMP
);
2986 reg_scan (insns
, max_reg_num (), 0);
2988 timevar_push (TV_IFCVT
);
2989 cleanup_cfg (CLEANUP_EXPENSIVE
);
2990 if (flag_if_conversion
)
2992 timevar_pop (TV_IFCVT
);
2994 timevar_pop (TV_JUMP
);
2995 /* CFG is no longer maintained up-to-date. */
2996 reg_scan (insns
, max_reg_num (), 0);
2997 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
2998 purge_all_dead_edges (0);
2999 delete_trivially_dead_insns (insns
, max_reg_num ());
3003 timevar_push (TV_JUMP
);
3004 rebuild_jump_labels (insns
);
3005 cleanup_cfg (CLEANUP_EXPENSIVE
);
3006 timevar_pop (TV_JUMP
);
3010 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
3011 timevar_pop (TV_CSE2
);
3016 cse_not_expected
= 1;
3018 open_dump_file (DFI_life
, decl
);
3021 check_function_return_warnings ();
3023 #ifdef ENABLE_CHECKING
3024 verify_flow_info ();
3026 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3028 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
3029 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3030 timevar_pop (TV_FLOW
);
3034 if (warn_uninitialized
|| extra_warnings
)
3036 uninitialized_vars_warning (DECL_INITIAL (decl
));
3038 setjmp_args_warning ();
3044 if (initialize_uninitialized_subregs ())
3046 /* Insns were inserted, so things might look a bit different. */
3047 insns
= get_insns ();
3048 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES
,
3049 PROP_LOG_LINKS
| PROP_REG_INFO
3050 | PROP_DEATH_NOTES
);
3054 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3058 /* If -opt, try combining insns through substitution. */
3062 int rebuild_jump_labels_after_combine
= 0;
3064 timevar_push (TV_COMBINE
);
3065 open_dump_file (DFI_combine
, decl
);
3067 rebuild_jump_labels_after_combine
3068 = combine_instructions (insns
, max_reg_num ());
3070 /* Combining insns may have turned an indirect jump into a
3071 direct jump. Rebuid the JUMP_LABEL fields of jumping
3073 if (rebuild_jump_labels_after_combine
)
3075 timevar_push (TV_JUMP
);
3076 rebuild_jump_labels (insns
);
3077 timevar_pop (TV_JUMP
);
3079 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3082 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3083 timevar_pop (TV_COMBINE
);
3088 /* Rerun if-conversion, as combine may have simplified things enough to
3089 now meet sequence length restrictions. */
3090 if (flag_if_conversion
)
3092 timevar_push (TV_IFCVT
);
3093 open_dump_file (DFI_ce
, decl
);
3099 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3100 timevar_pop (TV_IFCVT
);
3103 /* Register allocation pre-pass, to reduce number of moves
3104 necessary for two-address machines. */
3105 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3107 timevar_push (TV_REGMOVE
);
3108 open_dump_file (DFI_regmove
, decl
);
3110 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3112 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3113 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3114 timevar_pop (TV_REGMOVE
);
3119 /* Do unconditional splitting before register allocation to allow machine
3120 description to add extra information not needed previously. */
3121 split_all_insns (1);
3123 /* Any of the several passes since flow1 will have munged register
3124 lifetime data a bit. */
3125 register_life_up_to_date
= 0;
3127 #ifdef OPTIMIZE_MODE_SWITCHING
3128 timevar_push (TV_MODE_SWITCH
);
3131 optimize_mode_switching (NULL
);
3134 timevar_pop (TV_MODE_SWITCH
);
3137 timevar_push (TV_SCHED
);
3139 #ifdef INSN_SCHEDULING
3141 /* Print function header into sched dump now
3142 because doing the sched analysis makes some of the dump. */
3143 if (optimize
> 0 && flag_schedule_insns
)
3145 open_dump_file (DFI_sched
, decl
);
3147 /* Do control and data sched analysis,
3148 and write some of the results to dump file. */
3150 schedule_insns (rtl_dump_file
);
3152 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3154 /* Register lifetime information was updated as part of verifying
3156 register_life_up_to_date
= 1;
3159 timevar_pop (TV_SCHED
);
3163 /* Determine if the current function is a leaf before running reload
3164 since this can impact optimizations done by the prologue and
3165 epilogue thus changing register elimination offsets. */
3166 current_function_is_leaf
= leaf_function_p ();
3168 timevar_push (TV_LOCAL_ALLOC
);
3169 open_dump_file (DFI_lreg
, decl
);
3171 /* Allocate pseudo-regs that are used only within 1 basic block.
3173 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3174 jump optimizer after register allocation and reloading are finished. */
3176 if (! register_life_up_to_date
)
3177 recompute_reg_usage (insns
, ! optimize_size
);
3179 /* Allocate the reg_renumber array. */
3180 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3182 /* And the reg_equiv_memory_loc array. */
3183 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3185 allocate_initial_values (reg_equiv_memory_loc
);
3187 regclass (insns
, max_reg_num (), rtl_dump_file
);
3188 rebuild_label_notes_after_reload
= local_alloc ();
3190 timevar_pop (TV_LOCAL_ALLOC
);
3192 if (dump_file
[DFI_lreg
].enabled
)
3194 timevar_push (TV_DUMP
);
3196 dump_flow_info (rtl_dump_file
);
3197 dump_local_alloc (rtl_dump_file
);
3199 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3200 timevar_pop (TV_DUMP
);
3205 timevar_push (TV_GLOBAL_ALLOC
);
3206 open_dump_file (DFI_greg
, decl
);
3208 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3209 pass fixing up any insns that are invalid. */
3212 failure
= global_alloc (rtl_dump_file
);
3215 build_insn_chain (insns
);
3216 failure
= reload (insns
, 0);
3219 timevar_pop (TV_GLOBAL_ALLOC
);
3221 if (dump_file
[DFI_greg
].enabled
)
3223 timevar_push (TV_DUMP
);
3225 dump_global_regs (rtl_dump_file
);
3227 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3228 timevar_pop (TV_DUMP
);
3232 goto exit_rest_of_compilation
;
3236 open_dump_file (DFI_postreload
, decl
);
3238 /* Do a very simple CSE pass over just the hard registers. */
3241 timevar_push (TV_RELOAD_CSE_REGS
);
3242 reload_cse_regs (insns
);
3243 timevar_pop (TV_RELOAD_CSE_REGS
);
3246 /* Register allocation and reloading may have turned an indirect jump into
3247 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3248 jumping instructions. */
3249 if (rebuild_label_notes_after_reload
)
3251 timevar_push (TV_JUMP
);
3253 rebuild_jump_labels (insns
);
3254 purge_all_dead_edges (0);
3256 timevar_pop (TV_JUMP
);
3259 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3261 /* Re-create the death notes which were deleted during reload. */
3262 timevar_push (TV_FLOW2
);
3263 open_dump_file (DFI_flow2
, decl
);
3265 #ifdef ENABLE_CHECKING
3266 verify_flow_info ();
3269 /* If optimizing, then go ahead and split insns now. */
3271 split_all_insns (0);
3273 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3275 /* On some machines, the prologue and epilogue code, or parts thereof,
3276 can be represented as RTL. Doing so lets us schedule insns between
3277 it and the rest of the code and also allows delayed branch
3278 scheduling to operate in the epilogue. */
3279 thread_prologue_and_epilogue_insns (insns
);
3283 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3284 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3285 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3287 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3288 even for machines with possibly nonzero RETURN_POPS_ARGS
3289 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3290 push instructions will have popping returns. */
3291 #ifndef PUSH_ROUNDING
3292 if (!ACCUMULATE_OUTGOING_ARGS
)
3294 combine_stack_adjustments ();
3299 flow2_completed
= 1;
3301 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3302 timevar_pop (TV_FLOW2
);
3304 #ifdef HAVE_peephole2
3305 if (optimize
> 0 && flag_peephole2
)
3307 timevar_push (TV_PEEPHOLE2
);
3308 open_dump_file (DFI_peephole2
, decl
);
3310 peephole2_optimize (rtl_dump_file
);
3312 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3313 timevar_pop (TV_PEEPHOLE2
);
3317 if (optimize
> 0 && (flag_rename_registers
|| flag_cprop_registers
))
3319 timevar_push (TV_RENAME_REGISTERS
);
3320 open_dump_file (DFI_rnreg
, decl
);
3322 if (flag_rename_registers
)
3323 regrename_optimize ();
3324 if (flag_cprop_registers
)
3325 copyprop_hardreg_forward ();
3327 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3328 timevar_pop (TV_RENAME_REGISTERS
);
3331 if (flag_if_conversion2
)
3333 timevar_push (TV_IFCVT2
);
3334 open_dump_file (DFI_ce2
, decl
);
3338 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3339 timevar_pop (TV_IFCVT2
);
3343 split_all_insns (1);
3346 #ifdef INSN_SCHEDULING
3347 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3349 timevar_push (TV_SCHED2
);
3350 open_dump_file (DFI_sched2
, decl
);
3352 /* Do control and data sched analysis again,
3353 and write some more of the results to dump file. */
3355 split_all_insns (1);
3357 schedule_insns (rtl_dump_file
);
3359 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3360 timevar_pop (TV_SCHED2
);
3366 #ifdef LEAF_REGISTERS
3367 current_function_uses_only_leaf_regs
3368 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3372 timevar_push (TV_REG_STACK
);
3373 open_dump_file (DFI_stack
, decl
);
3375 reg_to_stack (insns
, rtl_dump_file
);
3377 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3378 timevar_pop (TV_REG_STACK
);
3384 timevar_push (TV_REORDER_BLOCKS
);
3385 open_dump_file (DFI_bbro
, decl
);
3387 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3388 splitting possibly introduced more crossjumping oppurtuntities.
3389 Except that we can't actually run crossjumping without running
3390 another DCE pass, which we can't do after reg-stack. */
3391 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3392 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3393 if (flag_reorder_blocks
)
3395 reorder_basic_blocks ();
3396 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3399 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3400 timevar_pop (TV_REORDER_BLOCKS
);
3402 compute_alignments ();
3404 /* CFG is no longer maintained up-to-date. */
3405 free_bb_for_insn ();
3407 /* If a machine dependent reorganization is needed, call it. */
3408 #ifdef MACHINE_DEPENDENT_REORG
3409 timevar_push (TV_MACH_DEP
);
3410 open_dump_file (DFI_mach
, decl
);
3412 MACHINE_DEPENDENT_REORG (insns
);
3414 close_dump_file (DFI_mach
, print_rtl
, insns
);
3415 timevar_pop (TV_MACH_DEP
);
3420 purge_line_number_notes (insns
);
3421 cleanup_barriers ();
3423 /* If a scheduling pass for delayed branches is to be done,
3424 call the scheduling code. */
3427 if (optimize
> 0 && flag_delayed_branch
)
3429 timevar_push (TV_DBR_SCHED
);
3430 open_dump_file (DFI_dbr
, decl
);
3432 dbr_schedule (insns
, rtl_dump_file
);
3434 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3435 timevar_pop (TV_DBR_SCHED
);
3441 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3442 timevar_push (TV_SHORTEN_BRANCH
);
3443 split_all_insns_noflow ();
3444 timevar_pop (TV_SHORTEN_BRANCH
);
3447 convert_to_eh_region_ranges ();
3449 /* Shorten branches. */
3450 timevar_push (TV_SHORTEN_BRANCH
);
3451 shorten_branches (get_insns ());
3452 timevar_pop (TV_SHORTEN_BRANCH
);
3454 current_function_nothrow
= nothrow_function_p ();
3455 if (current_function_nothrow
)
3456 /* Now we know that this can't throw; set the flag for the benefit
3457 of other functions later in this translation unit. */
3458 TREE_NOTHROW (current_function_decl
) = 1;
3460 /* Now turn the rtl into assembler code. */
3462 timevar_push (TV_FINAL
);
3467 /* Get the function's name, as described by its RTL. This may be
3468 different from the DECL_NAME name used in the source file. */
3470 x
= DECL_RTL (decl
);
3471 if (GET_CODE (x
) != MEM
)
3474 if (GET_CODE (x
) != SYMBOL_REF
)
3476 fnname
= XSTR (x
, 0);
3478 assemble_start_function (decl
, fnname
);
3479 final_start_function (insns
, asm_out_file
, optimize
);
3480 final (insns
, asm_out_file
, optimize
, 0);
3481 final_end_function ();
3483 #ifdef IA64_UNWIND_INFO
3484 /* ??? The IA-64 ".handlerdata" directive must be issued before
3485 the ".endp" directive that closes the procedure descriptor. */
3486 output_function_exception_table ();
3489 assemble_end_function (decl
, fnname
);
3491 #ifndef IA64_UNWIND_INFO
3492 /* Otherwise, it feels unclean to switch sections in the middle. */
3493 output_function_exception_table ();
3497 fflush (asm_out_file
);
3499 /* Release all memory allocated by flow. */
3500 free_basic_block_vars (0);
3502 /* Release all memory held by regsets now. */
3503 regset_release_memory ();
3505 timevar_pop (TV_FINAL
);
3509 /* Write DBX symbols if requested. */
3511 /* Note that for those inline functions where we don't initially
3512 know for certain that we will be generating an out-of-line copy,
3513 the first invocation of this routine (rest_of_compilation) will
3514 skip over this code by doing a `goto exit_rest_of_compilation;'.
3515 Later on, finish_compilation will call rest_of_compilation again
3516 for those inline functions that need to have out-of-line copies
3517 generated. During that call, we *will* be routed past here. */
3519 timevar_push (TV_SYMOUT
);
3520 (*debug_hooks
->function_decl
) (decl
);
3521 timevar_pop (TV_SYMOUT
);
3523 exit_rest_of_compilation
:
3525 /* In case the function was not output,
3526 don't leave any temporary anonymous types
3527 queued up for sdb output. */
3528 #ifdef SDB_DEBUGGING_INFO
3529 if (write_symbols
== SDB_DEBUG
)
3530 sdbout_types (NULL_TREE
);
3533 reload_completed
= 0;
3534 flow2_completed
= 0;
3537 timevar_push (TV_FINAL
);
3539 /* Clear out the insn_length contents now that they are no
3541 init_insn_lengths ();
3543 /* Show no temporary slots allocated. */
3546 free_basic_block_vars (0);
3547 free_bb_for_insn ();
3549 timevar_pop (TV_FINAL
);
3551 /* Make sure volatile mem refs aren't considered valid operands for
3552 arithmetic insns. We must call this here if this is a nested inline
3553 function, since the above code leaves us in the init_recog state
3554 (from final.c), and the function context push/pop code does not
3555 save/restore volatile_ok.
3557 ??? Maybe it isn't necessary for expand_start_function to call this
3558 anymore if we do it here? */
3560 init_recog_no_volatile ();
3562 /* We're done with this function. Free up memory if we can. */
3563 free_after_parsing (cfun
);
3564 if (! DECL_DEFER_OUTPUT (decl
))
3566 free_after_compilation (cfun
);
3568 /* Clear integrate.c's pointer to the cfun structure we just
3570 DECL_SAVED_INSNS (decl
) = 0;
3576 timevar_pop (TV_REST_OF_COMPILATION
);
3586 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3587 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3588 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3589 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3590 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3591 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"));
3592 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3594 for (i
= ARRAY_SIZE (f_options
); i
--;)
3596 const char *description
= f_options
[i
].description
;
3598 if (description
!= NULL
&& *description
!= 0)
3599 printf (" -f%-21s %s\n",
3600 f_options
[i
].string
, _(description
));
3603 printf (_(" -O[number] Set optimization level to [number]\n"));
3604 printf (_(" -Os Optimize for space rather than speed\n"));
3605 for (i
= LAST_PARAM
; i
--;)
3607 const char *description
= compiler_params
[i
].help
;
3608 const int length
= 21 - strlen (compiler_params
[i
].option
);
3610 if (description
!= NULL
&& *description
!= 0)
3611 printf (" --param %s=<value>%.*s%s\n",
3612 compiler_params
[i
].option
,
3613 length
> 0 ? length
: 1, " ",
3616 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3617 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3618 printf (_(" -w Suppress warnings\n"));
3619 printf (_(" -W Enable extra warnings\n"));
3621 for (i
= ARRAY_SIZE (W_options
); i
--;)
3623 const char *description
= W_options
[i
].description
;
3625 if (description
!= NULL
&& *description
!= 0)
3626 printf (" -W%-21s %s\n",
3627 W_options
[i
].string
, _(description
));
3630 printf (_(" -Wunused Enable unused warnings\n"));
3631 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3632 printf (_(" -p Enable function profiling\n"));
3633 printf (_(" -o <file> Place output into <file> \n"));
3635 -G <number> Put global and static data smaller than <number>\n\
3636 bytes into a special section (on some targets)\n"));
3638 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3640 if (debug_args
[i
].description
!= NULL
)
3641 printf (" -g%-21s %s\n",
3642 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3645 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3646 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3647 printf (_(" -version Display the compiler's version\n"));
3648 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3649 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3650 #if defined INSN_SCHEDULING
3651 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3653 printf (_(" --help Display this information\n"));
3658 /* Display descriptions of language specific options.
3659 If there is no description, note that there is an undocumented option.
3660 If the description is empty, do not display anything. (This allows
3661 options to be deliberately undocumented, for whatever reason).
3662 If the option string is missing, then this is a marker, indicating
3663 that the description string is in fact the name of a language, whose
3664 language specific options are to follow. */
3666 if (ARRAY_SIZE (documented_lang_options
) > 1)
3668 printf (_("\nLanguage specific options:\n"));
3670 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3672 const char *description
= documented_lang_options
[i
].description
;
3673 const char *option
= documented_lang_options
[i
].option
;
3675 if (description
== NULL
)
3680 printf (_(" %-23.23s [undocumented]\n"), option
);
3682 else if (*description
== 0)
3684 else if (option
== NULL
)
3688 (_("\nThere are undocumented %s specific options as well.\n"),
3692 printf (_("\n Options for %s:\n"), description
);
3697 printf (" %-23.23s %s\n", option
, _(description
));
3702 printf (_("\nThere are undocumented %s specific options as well.\n"),
3705 display_target_options ();
3709 display_target_options ()
3712 static bool displayed
= false;
3714 /* Avoid double printing for --help --target-help. */
3719 if (ARRAY_SIZE (target_switches
) > 1
3720 #ifdef TARGET_OPTIONS
3721 || ARRAY_SIZE (target_options
) > 1
3729 printf (_("\nTarget specific options:\n"));
3731 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3733 const char *option
= target_switches
[i
].name
;
3734 const char *description
= target_switches
[i
].description
;
3736 if (option
== NULL
|| *option
== 0)
3738 else if (description
== NULL
)
3743 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3745 else if (*description
!= 0)
3746 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3749 #ifdef TARGET_OPTIONS
3750 for (i
= ARRAY_SIZE (target_options
); i
--;)
3752 const char *option
= target_options
[i
].prefix
;
3753 const char *description
= target_options
[i
].description
;
3755 if (option
== NULL
|| *option
== 0)
3757 else if (description
== NULL
)
3762 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3764 else if (*description
!= 0)
3765 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3771 printf (_("\nThere are undocumented target specific options as well.\n"));
3773 printf (_(" They exist, but they are not documented.\n"));
3778 /* Parse a -d... command line switch. */
3781 decode_d_option (arg
)
3790 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3791 dump_file
[i
].enabled
= 1;
3797 flag_print_asm_name
= 1;
3800 flag_dump_rtl_in_asm
= 1;
3801 flag_print_asm_name
= 1;
3804 graph_dump_format
= vcg
;
3807 rtl_dump_and_exit
= 1;
3812 case 'D': /* These are handled by the preprocessor. */
3818 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3819 if (c
== dump_file
[i
].debug_switch
)
3821 dump_file
[i
].enabled
= 1;
3826 warning ("unrecognized gcc debugging option: %c", c
);
3831 /* Parse a -f... command line switch. ARG is the value after the -f.
3832 It is safe to access 'ARG - 2' to generate the full switch name.
3833 Return the number of strings consumed. */
3836 decode_f_option (arg
)
3840 const char *option_value
= NULL
;
3842 /* Search for the option in the table of binary f options. */
3843 for (j
= ARRAY_SIZE (f_options
); j
--;)
3845 if (!strcmp (arg
, f_options
[j
].string
))
3847 *f_options
[j
].variable
= f_options
[j
].on_value
;
3851 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3852 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3854 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3859 if (!strcmp (arg
, "fast-math"))
3860 set_fast_math_flags (1);
3861 else if (!strcmp (arg
, "no-fast-math"))
3862 set_fast_math_flags (0);
3863 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3864 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3867 read_integral_parameter (option_value
, arg
- 2,
3869 set_param_value ("max-inline-insns", val
);
3871 else if ((option_value
= skip_leading_substring (arg
, "tls-model=")))
3873 if (strcmp (option_value
, "global-dynamic") == 0)
3874 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
3875 else if (strcmp (option_value
, "local-dynamic") == 0)
3876 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
3877 else if (strcmp (option_value
, "initial-exec") == 0)
3878 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
3879 else if (strcmp (option_value
, "local-exec") == 0)
3880 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
3882 warning ("`%s': unknown tls-model option", arg
- 2);
3884 #ifdef INSN_SCHEDULING
3885 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3886 fix_sched_param ("verbose", option_value
);
3888 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3889 fix_register (option_value
, 1, 1);
3890 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3891 fix_register (option_value
, 0, 1);
3892 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3893 fix_register (option_value
, 0, 0);
3894 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3895 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3896 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3898 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3899 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3900 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3901 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3903 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3904 else if ((option_value
3905 = skip_leading_substring (arg
, "stack-limit-register=")))
3907 int reg
= decode_reg_name (option_value
);
3909 error ("unrecognized register name `%s'", option_value
);
3911 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3913 else if ((option_value
3914 = skip_leading_substring (arg
, "stack-limit-symbol=")))
3917 nm
= ggc_strdup (option_value
);
3918 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
3920 else if ((option_value
3921 = skip_leading_substring (arg
, "message-length=")))
3922 output_set_maximum_length
3923 (&global_dc
->buffer
, read_integral_parameter
3924 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
3925 else if ((option_value
3926 = skip_leading_substring (arg
, "diagnostics-show-location=")))
3928 if (!strcmp (option_value
, "once"))
3929 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
3930 else if (!strcmp (option_value
, "every-line"))
3931 diagnostic_prefixing_rule (global_dc
)
3932 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
3934 error ("unrecognized option `%s'", arg
- 2);
3936 else if (!strcmp (arg
, "no-stack-limit"))
3937 stack_limit_rtx
= NULL_RTX
;
3938 else if (!strcmp (arg
, "preprocessed"))
3939 /* Recognise this switch but do nothing. This prevents warnings
3940 about an unrecognized switch if cpplib has not been linked in. */
3948 /* Parse a -W... command line switch. ARG is the value after the -W.
3949 It is safe to access 'ARG - 2' to generate the full switch name.
3950 Return the number of strings consumed. */
3953 decode_W_option (arg
)
3956 const char *option_value
= NULL
;
3959 /* Search for the option in the table of binary W options. */
3961 for (j
= ARRAY_SIZE (W_options
); j
--;)
3963 if (!strcmp (arg
, W_options
[j
].string
))
3965 *W_options
[j
].variable
= W_options
[j
].on_value
;
3969 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3970 && ! strcmp (arg
+ 3, W_options
[j
].string
))
3972 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
3977 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
3978 warning ("-Wid-clash-LEN is no longer supported");
3979 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
3981 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
3983 warn_larger_than
= larger_than_size
!= -1;
3985 else if (!strcmp (arg
, "unused"))
3989 else if (!strcmp (arg
, "no-unused"))
3999 /* Parse a -g... command line switch. ARG is the value after the -g.
4000 It is safe to access 'ARG - 2' to generate the full switch name.
4001 Return the number of strings consumed. */
4004 decode_g_option (arg
)
4007 static unsigned level
= 0;
4008 /* A lot of code assumes write_symbols == NO_DEBUG if the
4009 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4010 of what debugging type has been selected). This records the
4011 selected type. It is an error to specify more than one
4013 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4014 /* Non-zero if debugging format has been explicitly set.
4015 -g and -ggdb don't explicitly set the debugging format so
4016 -gdwarf -g3 is equivalent to -gdwarf3. */
4017 static int type_explicitly_set_p
= 0;
4018 /* Indexed by enum debug_info_type. */
4019 static const char *const debug_type_names
[] =
4021 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4024 /* The maximum admissible debug level value. */
4025 static const unsigned max_debug_level
= 3;
4027 /* Look up ARG in the table. */
4028 for (da
= debug_args
; da
->arg
; da
++)
4030 const int da_len
= strlen (da
->arg
);
4032 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4034 enum debug_info_type type
= da
->debug_type
;
4035 const char *p
= arg
+ da_len
;
4037 if (*p
&& ! ISDIGIT (*p
))
4040 /* A debug flag without a level defaults to level 2.
4041 Note we do not want to call read_integral_parameter
4042 for that case since it will call atoi which
4045 ??? We may want to generalize the interface to
4046 read_integral_parameter to better handle this case
4047 if this case shows up often. */
4049 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4051 level
= (level
== 0) ? 2 : level
;
4053 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4055 error ("use -gdwarf -g%d for DWARF v1, level %d",
4058 error ("use -gdwarf-2 for DWARF v2");
4061 if (level
> max_debug_level
)
4064 ignoring option `%s' due to invalid debug level specification",
4066 level
= debug_info_level
;
4069 if (type
== NO_DEBUG
)
4071 type
= PREFERRED_DEBUGGING_TYPE
;
4073 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4075 #ifdef DWARF2_DEBUGGING_INFO
4076 type
= DWARF2_DEBUG
;
4078 #ifdef DBX_DEBUGGING_INFO
4085 if (type
== NO_DEBUG
)
4086 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4088 /* Does it conflict with an already selected type? */
4089 if (type_explicitly_set_p
4090 /* -g/-ggdb don't conflict with anything. */
4091 && da
->debug_type
!= NO_DEBUG
4092 && type
!= selected_debug_type
)
4093 warning ("`%s' ignored, conflicts with `-g%s'",
4094 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4097 /* If the format has already been set, -g/-ggdb
4098 only change the debug level. */
4099 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4100 /* Don't change debugging type. */
4104 selected_debug_type
= type
;
4105 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4108 write_symbols
= (level
== 0
4110 : selected_debug_type
);
4111 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4112 debug_info_level
= (enum debug_info_level
) level
;
4125 /* Decode the first argument in the argv as a language-independent option.
4126 Return the number of strings consumed. */
4129 independent_decode_option (argc
, argv
)
4133 char *arg
= argv
[0];
4135 if (arg
[0] != '-' || arg
[1] == 0)
4147 if (!strcmp (arg
, "-help"))
4150 exit_after_options
= 1;
4153 if (!strcmp (arg
, "-target-help"))
4155 display_target_options ();
4156 exit_after_options
= 1;
4159 if (!strcmp (arg
, "-version"))
4161 print_version (stderr
, "");
4162 exit_after_options
= 1;
4165 /* Handle '--param <name>=<value>'. */
4166 if (strcmp (arg
, "-param") == 0)
4172 error ("-param option missing argument");
4176 /* Get the '<name>=<value>' parameter. */
4178 /* Look for the `='. */
4179 equal
= strchr (arg
, '=');
4181 error ("invalid --param option: %s", arg
);
4186 /* Zero out the `=' sign so that we get two separate strings. */
4188 /* Figure out what value is specified. */
4189 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4190 if (val
!= INVALID_PARAM_VAL
)
4191 set_param_value (arg
, val
);
4193 error ("invalid parameter value `%s'", equal
+ 1);
4208 /* Already been treated in main (). Do nothing. */
4212 set_target_switch (arg
+ 1);
4216 return decode_f_option (arg
+ 1);
4219 return decode_g_option (arg
+ 1);
4222 if (!strcmp (arg
, "dumpbase"))
4227 dump_base_name
= argv
[1];
4231 decode_d_option (arg
+ 1);
4235 if (!strcmp (arg
, "pedantic"))
4237 else if (!strcmp (arg
, "pedantic-errors"))
4238 flag_pedantic_errors
= pedantic
= 1;
4239 else if (arg
[1] == 0)
4246 if (!strcmp (arg
, "quiet"))
4253 if (!strcmp (arg
, "version"))
4261 inhibit_warnings
= 1;
4270 /* We save the value of warn_uninitialized, since if they put
4271 -Wuninitialized on the command line, we need to generate a
4272 warning about not using it without also specifying -O. */
4273 if (warn_uninitialized
!= 1)
4274 warn_uninitialized
= 2;
4277 return decode_W_option (arg
+ 1);
4281 if (!strncmp (arg
, "aux-info", 8))
4288 aux_info_file_name
= argv
[1];
4289 flag_gen_aux_info
= 1;
4292 else if (arg
[8] == '=')
4294 aux_info_file_name
= arg
+ 9;
4295 flag_gen_aux_info
= 1;
4310 asm_file_name
= argv
[1];
4325 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4330 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4334 if (g_switch_val
== -1)
4338 g_switch_set
= TRUE
;
4339 g_switch_value
= g_switch_val
;
4349 /* Decode -m switches. */
4350 /* Decode the switch -mNAME. */
4353 set_target_switch (name
)
4357 int valid_target_option
= 0;
4359 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4360 if (!strcmp (target_switches
[j
].name
, name
))
4362 if (target_switches
[j
].value
< 0)
4363 target_flags
&= ~-target_switches
[j
].value
;
4365 target_flags
|= target_switches
[j
].value
;
4366 valid_target_option
= 1;
4369 #ifdef TARGET_OPTIONS
4370 if (!valid_target_option
)
4371 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4373 int len
= strlen (target_options
[j
].prefix
);
4374 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4376 *target_options
[j
].variable
= name
+ len
;
4377 valid_target_option
= 1;
4382 if (!valid_target_option
)
4383 error ("invalid option `%s'", name
);
4386 /* Print version information to FILE.
4387 Each line begins with INDENT (for the case where FILE is the
4388 assembler output file). */
4391 print_version (file
, indent
)
4396 #define __VERSION__ "[?]"
4400 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4402 "%s%s%s version %s (%s) compiled by CC.\n"
4404 , indent
, *indent
!= 0 ? " " : "",
4405 lang_hooks
.name
, version_string
, TARGET_NAME
,
4406 indent
, __VERSION__
);
4409 /* Print an option value and return the adjusted position in the line.
4410 ??? We don't handle error returns from fprintf (disk full); presumably
4411 other code will catch a disk full though. */
4414 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4417 const char *indent
, *sep
, *term
, *type
, *name
;
4419 /* The ultrix fprintf returns 0 on success, so compute the result we want
4420 here since we need it for the following test. */
4421 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4426 fprintf (file
, "%s", term
);
4431 fprintf (file
, "%s", indent
);
4432 pos
= strlen (indent
);
4434 fprintf (file
, "%s%s%s", sep
, type
, name
);
4439 /* Print active target switches to FILE.
4440 POS is the current cursor position and MAX is the size of a "line".
4441 Each line begins with INDENT and ends with TERM.
4442 Each switch is separated from the next by SEP. */
4445 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4448 const char *indent
, *sep
, *term
;
4453 /* Print the options as passed. */
4455 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4456 _("options passed: "), "");
4458 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4462 if (strcmp (*p
, "-o") == 0)
4468 if (strcmp (*p
, "-quiet") == 0)
4470 if (strcmp (*p
, "-version") == 0)
4475 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4478 fprintf (file
, "%s", term
);
4480 /* Print the -f and -m options that have been enabled.
4481 We don't handle language specific options but printing argv
4484 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4485 _("options enabled: "), "");
4487 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4488 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4489 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4490 "-f", f_options
[j
].string
);
4492 /* Print target specific options. */
4494 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4495 if (target_switches
[j
].name
[0] != '\0'
4496 && target_switches
[j
].value
> 0
4497 && ((target_switches
[j
].value
& target_flags
)
4498 == target_switches
[j
].value
))
4500 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4501 "-m", target_switches
[j
].name
);
4504 #ifdef TARGET_OPTIONS
4505 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4506 if (*target_options
[j
].variable
!= NULL
)
4509 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4510 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4511 prefix
, *target_options
[j
].variable
);
4515 fprintf (file
, "%s", term
);
4518 /* Open assembly code output file. Do this even if -fsyntax-only is
4519 on, because then the driver will have provided the name of a
4520 temporary file or bit bucket for us. NAME is the file specified on
4521 the command line, possibly NULL. */
4523 init_asm_output (name
)
4526 if (name
== NULL
&& asm_file_name
== 0)
4527 asm_out_file
= stdout
;
4530 if (asm_file_name
== 0)
4532 int len
= strlen (dump_base_name
);
4533 char *dumpname
= (char *) xmalloc (len
+ 6);
4534 memcpy (dumpname
, dump_base_name
, len
+ 1);
4535 strip_off_ending (dumpname
, len
);
4536 strcat (dumpname
, ".s");
4537 asm_file_name
= dumpname
;
4539 if (!strcmp (asm_file_name
, "-"))
4540 asm_out_file
= stdout
;
4542 asm_out_file
= fopen (asm_file_name
, "w");
4543 if (asm_out_file
== 0)
4544 fatal_io_error ("can't open %s for writing", asm_file_name
);
4547 #ifdef IO_BUFFER_SIZE
4548 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4549 _IOFBF
, IO_BUFFER_SIZE
);
4552 if (!flag_syntax_only
)
4554 #ifdef ASM_FILE_START
4555 ASM_FILE_START (asm_out_file
);
4558 #ifdef ASM_COMMENT_START
4559 if (flag_verbose_asm
)
4561 /* Print the list of options in effect. */
4562 print_version (asm_out_file
, ASM_COMMENT_START
);
4563 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4564 ASM_COMMENT_START
, " ", "\n");
4565 /* Add a blank line here so it appears in assembler output but not
4567 fprintf (asm_out_file
, "\n");
4573 /* Initialization of the front end environment, before command line
4574 options are parsed. Signal handlers, internationalization etc.
4575 ARGV0 is main's argv[0]. */
4577 general_init (argv0
)
4582 p
= argv0
+ strlen (argv0
);
4583 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4587 xmalloc_set_program_name (progname
);
4589 gcc_init_libintl ();
4591 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4593 signal (SIGSEGV
, crash_signal
);
4596 signal (SIGILL
, crash_signal
);
4599 signal (SIGBUS
, crash_signal
);
4602 signal (SIGABRT
, crash_signal
);
4604 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4605 signal (SIGIOT
, crash_signal
);
4608 signal (SIGFPE
, crash_signal
);
4611 /* Initialize the diagnostics reporting machinery, so option parsing
4612 can give warnings and errors. */
4613 diagnostic_initialize (global_dc
);
4616 /* Parse command line options and set default flag values, called
4617 after language-independent option-independent initialization. Do
4618 minimal options processing. Outputting diagnostics is OK, but GC
4619 and identifier hashtables etc. are not initialized yet. */
4621 parse_options_and_default_flags (argc
, argv
)
4627 /* Save in case md file wants to emit args as a comment. */
4631 /* Initialize register usage now so switches may override. */
4634 /* Register the language-independent parameters. */
4635 add_params (lang_independent_params
, LAST_PARAM
);
4637 /* Perform language-specific options initialization. */
4638 (*lang_hooks
.init_options
) ();
4640 /* Scan to see what optimization level has been specified. That will
4641 determine the default value of many flags. */
4642 for (i
= 1; i
< argc
; i
++)
4644 if (!strcmp (argv
[i
], "-O"))
4649 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4651 /* Handle -Os, -O2, -O3, -O69, ... */
4652 char *p
= &argv
[i
][2];
4654 if ((p
[0] == 's') && (p
[1] == 0))
4658 /* Optimizing for size forces optimize to be 2. */
4663 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4664 if (optimize_val
!= -1)
4666 optimize
= optimize_val
;
4675 flag_merge_constants
= 0;
4681 flag_thread_jumps
= 1;
4683 flag_delayed_branch
= 1;
4685 #ifdef CAN_DEBUG_WITHOUT_FP
4686 flag_omit_frame_pointer
= 1;
4688 flag_guess_branch_prob
= 1;
4689 flag_cprop_registers
= 1;
4690 flag_loop_optimize
= 1;
4691 flag_crossjumping
= 1;
4692 flag_if_conversion
= 1;
4693 flag_if_conversion2
= 1;
4698 flag_optimize_sibling_calls
= 1;
4699 flag_cse_follow_jumps
= 1;
4700 flag_cse_skip_blocks
= 1;
4702 flag_expensive_optimizations
= 1;
4703 flag_strength_reduce
= 1;
4704 flag_rerun_cse_after_loop
= 1;
4705 flag_rerun_loop_opt
= 1;
4706 flag_caller_saves
= 1;
4709 #ifdef INSN_SCHEDULING
4710 flag_schedule_insns
= 1;
4711 flag_schedule_insns_after_reload
= 1;
4714 flag_strict_aliasing
= 1;
4715 flag_delete_null_pointer_checks
= 1;
4716 flag_reorder_blocks
= 1;
4717 flag_reorder_functions
= 1;
4722 flag_inline_functions
= 1;
4723 flag_rename_registers
= 1;
4726 if (optimize
< 2 || optimize_size
)
4731 align_functions
= 1;
4734 /* Initialize whether `char' is signed. */
4735 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4736 #ifdef DEFAULT_SHORT_ENUMS
4737 /* Initialize how much space enums occupy, by default. */
4738 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4741 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4744 set_target_switch ("");
4746 /* Unwind tables are always present in an ABI-conformant IA-64
4747 object file, so the default should be ON. */
4748 #ifdef IA64_UNWIND_INFO
4749 flag_unwind_tables
= IA64_UNWIND_INFO
;
4752 #ifdef OPTIMIZATION_OPTIONS
4753 /* Allow default optimizations to be specified on a per-machine basis. */
4754 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4757 /* Perform normal command line switch decoding. */
4758 for (i
= 1; i
< argc
;)
4761 int indep_processed
;
4763 /* Give the language a chance to decode the option for itself. */
4764 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4766 if (lang_processed
>= 0)
4767 /* Now see if the option also has a language independent meaning.
4768 Some options are both language specific and language independent,
4770 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4773 lang_processed
= -lang_processed
;
4774 indep_processed
= 0;
4777 if (lang_processed
|| indep_processed
)
4778 i
+= MAX (lang_processed
, indep_processed
);
4781 const char *option
= NULL
;
4782 const char *lang
= NULL
;
4785 /* It is possible that the command line switch is not valid for the
4786 current language, but it is valid for another language. In order
4787 to be compatible with previous versions of the compiler (which
4788 did not issue an error message in this case) we check for this
4789 possibility here. If we do find a match, then if extra_warnings
4790 is set we generate a warning message, otherwise we will just
4791 ignore the option. */
4792 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4794 option
= documented_lang_options
[j
].option
;
4797 lang
= documented_lang_options
[j
].description
;
4798 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4802 if (j
!= ARRAY_SIZE (documented_lang_options
))
4806 warning ("ignoring command line option '%s'", argv
[i
]);
4809 ("(it is valid for %s but not the selected language)",
4813 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4814 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4816 error ("unrecognized option `%s'", argv
[i
]);
4822 if (flag_no_inline
== 2)
4825 flag_really_no_inline
= flag_no_inline
;
4827 /* Set flag_no_inline before the post_options () hook. The C front
4828 ends use it to determine tree inlining defaults. FIXME: such
4829 code should be lang-independent when all front ends use tree
4830 inlining, in which case it, and this condition, should be moved
4831 to the top of process_options() instead. */
4834 /* Inlining does not work if not optimizing,
4835 so force it not to be done. */
4839 /* The c_decode_option function and decode_option hook set
4840 this to `2' if -Wall is used, so we can avoid giving out
4841 lots of errors for people who don't realize what -Wall does. */
4842 if (warn_uninitialized
== 1)
4843 warning ("-Wuninitialized is not supported without -O");
4846 if (flag_really_no_inline
== 2)
4847 flag_really_no_inline
= flag_no_inline
;
4849 /* All command line options have been parsed; allow the front end to
4850 perform consistency checks, etc. */
4851 (*lang_hooks
.post_options
) ();
4854 /* Process the options that have been parsed. */
4858 #ifdef OVERRIDE_OPTIONS
4859 /* Some machines may reject certain combinations of options. */
4863 /* Set up the align_*_log variables, defaulting them to 1 if they
4864 were still unset. */
4865 if (align_loops
<= 0) align_loops
= 1;
4866 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4867 align_loops_max_skip
= align_loops
- 1;
4868 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4869 if (align_jumps
<= 0) align_jumps
= 1;
4870 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4871 align_jumps_max_skip
= align_jumps
- 1;
4872 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4873 if (align_labels
<= 0) align_labels
= 1;
4874 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4875 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4876 align_labels_max_skip
= align_labels
- 1;
4877 if (align_functions
<= 0) align_functions
= 1;
4878 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4880 /* Unrolling all loops implies that standard loop unrolling must also
4882 if (flag_unroll_all_loops
)
4883 flag_unroll_loops
= 1;
4884 /* Loop unrolling requires that strength_reduction be on also. Silently
4885 turn on strength reduction here if it isn't already on. Also, the loop
4886 unrolling code assumes that cse will be run after loop, so that must
4887 be turned on also. */
4888 if (flag_unroll_loops
)
4890 flag_strength_reduce
= 1;
4891 flag_rerun_cse_after_loop
= 1;
4894 if (flag_non_call_exceptions
)
4895 flag_asynchronous_unwind_tables
= 1;
4896 if (flag_asynchronous_unwind_tables
)
4897 flag_unwind_tables
= 1;
4899 /* Warn about options that are not supported on this machine. */
4900 #ifndef INSN_SCHEDULING
4901 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4902 warning ("instruction scheduling not supported on this target machine");
4905 if (flag_delayed_branch
)
4906 warning ("this target machine does not have delayed branches");
4909 user_label_prefix
= USER_LABEL_PREFIX
;
4910 if (flag_leading_underscore
!= -1)
4912 /* If the default prefix is more complicated than "" or "_",
4913 issue a warning and ignore this option. */
4914 if (user_label_prefix
[0] == 0 ||
4915 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4917 user_label_prefix
= flag_leading_underscore
? "_" : "";
4920 warning ("-f%sleading-underscore not supported on this target machine",
4921 flag_leading_underscore
? "" : "no-");
4924 /* If we are in verbose mode, write out the version and maybe all the
4925 option flags in use. */
4928 print_version (stderr
, "");
4930 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4936 if (flag_syntax_only
)
4938 write_symbols
= NO_DEBUG
;
4942 /* Now we know write_symbols, set up the debug hooks based on it.
4943 By default we do nothing for debug output. */
4944 #if defined(DBX_DEBUGGING_INFO)
4945 if (write_symbols
== DBX_DEBUG
)
4946 debug_hooks
= &dbx_debug_hooks
;
4948 #if defined(XCOFF_DEBUGGING_INFO)
4949 if (write_symbols
== XCOFF_DEBUG
)
4950 debug_hooks
= &xcoff_debug_hooks
;
4952 #ifdef SDB_DEBUGGING_INFO
4953 if (write_symbols
== SDB_DEBUG
)
4954 debug_hooks
= &sdb_debug_hooks
;
4956 #ifdef DWARF_DEBUGGING_INFO
4957 if (write_symbols
== DWARF_DEBUG
)
4958 debug_hooks
= &dwarf_debug_hooks
;
4960 #ifdef DWARF2_DEBUGGING_INFO
4961 if (write_symbols
== DWARF2_DEBUG
)
4962 debug_hooks
= &dwarf2_debug_hooks
;
4964 #ifdef VMS_DEBUGGING_INFO
4965 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4966 debug_hooks
= &vmsdbg_debug_hooks
;
4969 /* If auxiliary info generation is desired, open the output file.
4970 This goes in the same directory as the source file--unlike
4971 all the other output files. */
4972 if (flag_gen_aux_info
)
4974 aux_info_file
= fopen (aux_info_file_name
, "w");
4975 if (aux_info_file
== 0)
4976 fatal_io_error ("can't open %s", aux_info_file_name
);
4979 if (! targetm
.have_named_sections
)
4981 if (flag_function_sections
)
4983 warning ("-ffunction-sections not supported for this target");
4984 flag_function_sections
= 0;
4986 if (flag_data_sections
)
4988 warning ("-fdata-sections not supported for this target");
4989 flag_data_sections
= 0;
4993 if (flag_function_sections
&& profile_flag
)
4995 warning ("-ffunction-sections disabled; it makes profiling impossible");
4996 flag_function_sections
= 0;
4999 #ifndef HAVE_prefetch
5000 if (flag_prefetch_loop_arrays
)
5002 warning ("-fprefetch-loop-arrays not supported for this target");
5003 flag_prefetch_loop_arrays
= 0;
5006 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
5008 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5009 flag_prefetch_loop_arrays
= 0;
5013 /* This combination of options isn't handled for i386 targets and doesn't
5014 make much sense anyway, so don't allow it. */
5015 if (flag_prefetch_loop_arrays
&& optimize_size
)
5017 warning ("-fprefetch-loop-arrays is not supported with -Os");
5018 flag_prefetch_loop_arrays
= 0;
5021 #ifndef OBJECT_FORMAT_ELF
5022 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5023 warning ("-ffunction-sections may affect debugging on some targets");
5027 /* Language-independent initialization, before language-dependent
5030 lang_independent_init ()
5032 /* Initialize the garbage-collector, and string pools. */
5038 /* init_emit_once uses reg_raw_mode and therefore must be called
5039 after init_regs which initialized reg_raw_mode. */
5041 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5042 || debug_info_level
== DINFO_LEVEL_VERBOSE
5043 #ifdef VMS_DEBUGGING_INFO
5044 /* Enable line number info for traceback */
5045 || debug_info_level
> DINFO_LEVEL_NONE
5047 || flag_test_coverage
5048 || warn_notreached
);
5049 init_fake_stack_mems ();
5053 init_function_once ();
5054 init_varasm_once ();
5056 /* The following initialization functions need to generate rtl, so
5057 provide a dummy function context for them. */
5058 init_dummy_function_start ();
5060 if (flag_caller_saves
)
5061 init_caller_save ();
5062 expand_dummy_function_end ();
5065 /* Language-dependent initialization. Returns non-zero on success. */
5067 lang_dependent_init (name
)
5070 if (dump_base_name
== 0)
5071 dump_base_name
= name
? name
: "gccdump";
5073 /* Front-end initialization. This hook can assume that GC,
5074 identifier hashes etc. are set up, but debug initialization is
5075 not done yet. This routine must return the original filename
5076 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5077 name
= (*lang_hooks
.init
) (name
);
5081 /* Is this duplication necessary? */
5082 name
= ggc_strdup (name
);
5083 main_input_filename
= input_filename
= name
;
5084 init_asm_output (name
);
5086 /* These create various _DECL nodes, so need to be called after the
5087 front end is initialized. */
5092 /* Put an entry on the input file stack for the main input file. */
5093 push_srcloc (input_filename
, 0);
5095 /* If dbx symbol table desired, initialize writing it and output the
5096 predefined types. */
5097 timevar_push (TV_SYMOUT
);
5099 #ifdef DWARF2_UNWIND_INFO
5100 if (dwarf2out_do_frame ())
5101 dwarf2out_frame_init ();
5104 /* Now we have the correct original filename, we can initialize
5106 (*debug_hooks
->init
) (name
);
5108 timevar_pop (TV_SYMOUT
);
5113 /* Clean up: close opened files, etc. */
5118 /* Close the dump files. */
5119 if (flag_gen_aux_info
)
5121 fclose (aux_info_file
);
5123 unlink (aux_info_file_name
);
5126 /* Close non-debugging input and output files. Take special care to note
5127 whether fclose returns an error, since the pages might still be on the
5128 buffer chain while the file is open. */
5132 if (ferror (asm_out_file
) != 0)
5133 fatal_io_error ("error writing to %s", asm_file_name
);
5134 if (fclose (asm_out_file
) != 0)
5135 fatal_io_error ("error closing %s", asm_file_name
);
5138 /* Do whatever is necessary to finish printing the graphs. */
5139 if (graph_dump_format
!= no_graph
)
5143 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5144 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5149 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5150 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5151 finish_graph_dump_file (dump_base_name
, suffix
);
5158 ggc_print_statistics ();
5159 stringpool_statistics ();
5160 dump_tree_statistics ();
5163 /* Free up memory for the benefit of leak detectors. */
5166 /* Language-specific end of compilation actions. */
5167 (*lang_hooks
.finish
) ();
5170 /* Initialize the compiler, and compile the input file. */
5174 /* The bulk of command line switch processing. */
5177 /* We cannot start timing until after options are processed since that
5178 says if we run timers or not. */
5180 timevar_start (TV_TOTAL
);
5182 /* Language-independent initialization. Also sets up GC, identifier
5184 lang_independent_init ();
5186 /* Language-dependent initialization. Returns true on success. */
5187 if (lang_dependent_init (filename
))
5192 /* Stop timing and print the times. */
5193 timevar_stop (TV_TOTAL
);
5194 timevar_print (stderr
);
5197 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5198 Decode command args, then call compile_file.
5199 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5200 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5202 It is not safe to call this function more than once. */
5205 toplev_main (argc
, argv
)
5211 /* Initialization of GCC's environment, and diagnostics. */
5212 general_init (argv
[0]);
5214 /* Parse the options and do minimal processing; basically just
5215 enough to default flags appropriately. */
5216 parse_options_and_default_flags (argc
, argv
);
5218 /* Exit early if we can (e.g. -help). */
5219 if (!errorcount
&& !exit_after_options
)
5222 if (errorcount
|| sorrycount
)
5223 return (FATAL_EXIT_CODE
);
5225 return (SUCCESS_EXIT_CODE
);