1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
46 #include "insn-attr.h"
47 #include "insn-config.h"
48 #include "insn-flags.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
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 extern void reg_alloc
PARAMS ((void));
100 static void general_init
PARAMS ((char *));
101 static void parse_options_and_default_flags
PARAMS ((int, char **));
102 static void do_compile
PARAMS ((void));
103 static void process_options
PARAMS ((void));
104 static void backend_init
PARAMS ((void));
105 static int lang_dependent_init
PARAMS ((const char *));
106 static void init_asm_output
PARAMS ((const char *));
107 static void finalize
PARAMS ((void));
109 static void set_target_switch
PARAMS ((const char *));
111 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
112 static void compile_file
PARAMS ((void));
113 static void display_help
PARAMS ((void));
114 static void display_target_options
PARAMS ((void));
116 static void decode_d_option
PARAMS ((const char *));
117 static int decode_f_option
PARAMS ((const char *));
118 static int decode_W_option
PARAMS ((const char *));
119 static int decode_g_option
PARAMS ((const char *));
120 static unsigned int independent_decode_option
PARAMS ((int, char **));
122 static void print_version
PARAMS ((FILE *, const char *));
123 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
124 const char *, const char *,
125 const char *, const char *));
126 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
127 const char *, const char *));
129 /* Nonzero to dump debug info whilst parsing (-dy option). */
130 static int set_yydebug
;
132 /* Length of line when printing switch values. */
135 /* Name of program invoked, sans directories. */
137 const char *progname
;
139 /* Copy of arguments to toplev_main. */
143 /* Name of current original source file (what was input to cpp).
144 This comes from each #-command in the actual input. */
146 const char *input_filename
;
148 /* Name of top-level original source file (what was input to cpp).
149 This comes from the #-command at the beginning of the actual input.
150 If there isn't any there, then this is the cc1 input file name. */
152 const char *main_input_filename
;
154 /* Current line number in real source file. */
158 /* Nonzero if it is unsafe to create any new pseudo registers. */
161 /* Stack of currently pending input files. */
163 struct file_stack
*input_file_stack
;
165 /* Incremented on each change to input_file_stack. */
166 int input_file_stack_tick
;
168 /* Name to use as base of names for dump output files. */
170 const char *dump_base_name
;
172 /* Name to use as a base for auxiliary output files. */
174 const char *aux_base_name
;
176 /* Format to use to print dumpfile index value */
177 #ifndef DUMPFILE_FORMAT
178 #define DUMPFILE_FORMAT ".%02d."
181 /* Bit flags that specify the machine subtype we are compiling for.
182 Bits are tested using macros TARGET_... defined in the tm.h file
183 and set by `-m...' switches. Must be defined in rtlanal.c. */
185 extern int target_flags
;
187 /* A mask of target_flags that includes bit X if X was set or cleared
188 on the command line. */
190 int target_flags_explicit
;
192 /* Debug hooks - dependent upon command line options. */
194 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
196 /* Describes a dump file. */
198 struct dump_file_info
200 /* The unique extension to apply, e.g. ".jump". */
201 const char *const extension
;
203 /* The -d<c> character that enables this dump file. */
204 char const debug_switch
;
206 /* True if there is a corresponding graph dump file. */
207 char const graph_dump_p
;
209 /* True if the user selected this dump. */
212 /* True if the files have been initialized (ie truncated). */
216 /* Enumerate the extant dump files. */
257 /* Describes all the dump files. Should be kept in order of the
258 pass and in sync with dump_file_index above.
260 Remaining -d letters:
266 static struct dump_file_info dump_file
[DFI_MAX
] =
268 { "rtl", 'r', 0, 0, 0 },
269 { "sibling", 'i', 0, 0, 0 },
270 { "eh", 'h', 0, 0, 0 },
271 { "jump", 'j', 0, 0, 0 },
272 { "ssa", 'e', 1, 0, 0 },
273 { "ssaccp", 'W', 1, 0, 0 },
274 { "ssadce", 'X', 1, 0, 0 },
275 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
276 { "null", 'u', 0, 0, 0 },
277 { "cse", 's', 0, 0, 0 },
278 { "addressof", 'F', 0, 0, 0 },
279 { "gcse", 'G', 1, 0, 0 },
280 { "loop", 'L', 1, 0, 0 },
281 { "cfg", 'f', 1, 0, 0 },
282 { "bp", 'b', 1, 0, 0 },
283 { "tracer", 'T', 1, 0, 0 },
284 { "cse2", 't', 1, 0, 0 },
285 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
286 { "combine", 'c', 1, 0, 0 },
287 { "ce", 'C', 1, 0, 0 },
288 { "regmove", 'N', 1, 0, 0 },
289 { "sched", 'S', 1, 0, 0 },
290 { "lreg", 'l', 1, 0, 0 },
291 { "greg", 'g', 1, 0, 0 },
292 { "postreload", 'o', 1, 0, 0 },
293 { "flow2", 'w', 1, 0, 0 },
294 { "peephole2", 'z', 1, 0, 0 },
295 { "rnreg", 'n', 1, 0, 0 },
296 { "ce2", 'E', 1, 0, 0 },
297 { "sched2", 'R', 1, 0, 0 },
298 { "stack", 'k', 1, 0, 0 },
299 { "bbro", 'B', 1, 0, 0 },
300 { "mach", 'M', 1, 0, 0 },
301 { "dbr", 'd', 0, 0, 0 },
304 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
305 static void close_dump_file
PARAMS ((enum dump_file_index
,
306 void (*) (FILE *, rtx
), rtx
));
308 /* Other flags saying which kinds of debugging dump have been requested. */
310 int rtl_dump_and_exit
;
311 int flag_print_asm_name
;
312 static int version_flag
;
313 static char *filename
;
314 enum graph_dump_types graph_dump_format
;
316 /* Name for output file of assembly code, specified with -o. */
320 /* Value of the -G xx switch, and whether it was passed or not. */
324 /* Type(s) of debugging information we are producing (if any).
325 See flags.h for the definitions of the different possible
326 types of debugging information. */
327 enum debug_info_type write_symbols
= NO_DEBUG
;
329 /* Level of debugging information we are producing. See flags.h
330 for the definitions of the different possible levels. */
331 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
333 /* Nonzero means use GNU-only extensions in the generated symbolic
334 debugging information. */
335 /* Currently, this only has an effect when write_symbols is set to
336 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
337 int use_gnu_debug_info_extensions
= 0;
339 /* Nonzero means do optimizations. -O.
340 Particular numeric values stand for particular amounts of optimization;
341 thus, -O2 stores 2 here. However, the optimizations beyond the basic
342 ones are not controlled directly by this variable. Instead, they are
343 controlled by individual `flag_...' variables that are defaulted
344 based on this variable. */
348 /* Nonzero means optimize for size. -Os.
349 The only valid values are zero and nonzero. When optimize_size is
350 nonzero, optimize defaults to 2, but certain individual code
351 bloating optimizations are disabled. */
353 int optimize_size
= 0;
355 /* Nonzero if we should exit after parsing options. */
356 static int exit_after_options
= 0;
358 /* The FUNCTION_DECL for the function currently being compiled,
359 or 0 if between functions. */
360 tree current_function_decl
;
362 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
364 tree current_function_func_begin_label
;
366 /* Nonzero if doing dwarf2 duplicate elimination. */
368 int flag_eliminate_dwarf2_dups
= 0;
370 /* Nonzero if generating code to do profiling. */
372 int profile_flag
= 0;
374 /* Nonzero if generating code to profile program flow graph arcs. */
376 int profile_arc_flag
= 0;
378 /* Nonzero if we should not attempt to generate thread-safe
379 code to profile program flow graph arcs. */
381 int flag_unsafe_profile_arcs
= 0;
383 /* Nonzero if generating info for gcov to calculate line test coverage. */
385 int flag_test_coverage
= 0;
387 /* Nonzero indicates that branch taken probabilities should be calculated. */
389 int flag_branch_probabilities
= 0;
391 /* Nonzero if basic blocks should be reordered. */
393 int flag_reorder_blocks
= 0;
395 /* Nonzero if functions should be reordered. */
397 int flag_reorder_functions
= 0;
399 /* Nonzero if registers should be renamed. */
401 int flag_rename_registers
= 0;
402 int flag_cprop_registers
= 0;
404 /* Nonzero for -pedantic switch: warn about anything
405 that standard spec forbids. */
409 /* Temporarily suppress certain warnings.
410 This is set while reading code from a system header file. */
412 int in_system_header
= 0;
414 /* Don't print functions as they are compiled. -quiet. */
418 /* Print times taken by the various passes. -ftime-report. */
422 /* Print memory still in use at end of compilation (which may have little
423 to do with peak memory consumption). -fmem-report. */
427 /* Non-zero means to collect statistics which might be expensive
428 and to print them when we are done. */
429 int flag_detailed_statistics
= 0;
434 /* Nonzero means `char' should be signed. */
436 int flag_signed_char
;
438 /* Nonzero means give an enum type only as many bytes as it needs. */
440 int flag_short_enums
;
442 /* Nonzero for -fcaller-saves: allocate values in regs that need to
443 be saved across function calls, if that produces overall better code.
444 Optional now, so people can test it. */
446 #ifdef DEFAULT_CALLER_SAVES
447 int flag_caller_saves
= 1;
449 int flag_caller_saves
= 0;
452 /* Nonzero if structures and unions should be returned in memory.
454 This should only be defined if compatibility with another compiler or
455 with an ABI is needed, because it results in slower code. */
457 #ifndef DEFAULT_PCC_STRUCT_RETURN
458 #define DEFAULT_PCC_STRUCT_RETURN 1
461 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
463 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
465 /* Nonzero for -fforce-mem: load memory value into a register
466 before arithmetic on it. This makes better cse but slower compilation. */
468 int flag_force_mem
= 0;
470 /* Nonzero for -fforce-addr: load memory address into a register before
471 reference to memory. This makes better cse but slower compilation. */
473 int flag_force_addr
= 0;
475 /* Nonzero for -fdefer-pop: don't pop args after each function call;
476 instead save them up to pop many calls' args with one insns. */
478 int flag_defer_pop
= 0;
480 /* Nonzero for -ffloat-store: don't allocate floats and doubles
481 in extended-precision registers. */
483 int flag_float_store
= 0;
485 /* Nonzero for -fcse-follow-jumps:
486 have cse follow jumps to do a more extensive job. */
488 int flag_cse_follow_jumps
;
490 /* Nonzero for -fcse-skip-blocks:
491 have cse follow a branch around a block. */
492 int flag_cse_skip_blocks
;
494 /* Nonzero for -fexpensive-optimizations:
495 perform miscellaneous relatively-expensive optimizations. */
496 int flag_expensive_optimizations
;
498 /* Nonzero for -fthread-jumps:
499 have jump optimize output of loop. */
501 int flag_thread_jumps
;
503 /* Nonzero enables strength-reduction in loop.c. */
505 int flag_strength_reduce
= 0;
507 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
508 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
509 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
512 int flag_unroll_loops
;
514 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
515 This is generally not a win. */
517 int flag_unroll_all_loops
;
519 /* Nonzero enables prefetch optimizations for arrays in loops. */
521 int flag_prefetch_loop_arrays
;
523 /* Nonzero forces all invariant computations in loops to be moved
526 int flag_move_all_movables
= 0;
528 /* Nonzero forces all general induction variables in loops to be
531 int flag_reduce_all_givs
= 0;
533 /* Nonzero to perform full register move optimization passes. This is the
536 int flag_regmove
= 0;
538 /* Nonzero for -fwritable-strings:
539 store string constants in data segment and don't uniquize them. */
541 int flag_writable_strings
= 0;
543 /* Nonzero means don't put addresses of constant functions in registers.
544 Used for compiling the Unix kernel, where strange substitutions are
545 done on the assembly output. */
547 int flag_no_function_cse
= 0;
549 /* Nonzero for -fomit-frame-pointer:
550 don't make a frame pointer in simple functions that don't require one. */
552 int flag_omit_frame_pointer
= 0;
554 /* Nonzero means place each function into its own section on those platforms
555 which support arbitrary section names and unlimited numbers of sections. */
557 int flag_function_sections
= 0;
559 /* ... and similar for data. */
561 int flag_data_sections
= 0;
563 /* Nonzero to inhibit use of define_optimization peephole opts. */
565 int flag_no_peephole
= 0;
567 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
569 int flag_optimize_sibling_calls
= 0;
571 /* Nonzero means the front end generally wants `errno' maintained by math
572 operations, like built-in SQRT. */
574 int flag_errno_math
= 1;
576 /* Nonzero means that unsafe floating-point math optimizations are allowed
577 for the sake of speed. IEEE compliance is not guaranteed, and operations
578 are allowed to assume that their arguments and results are "normal"
579 (e.g., nonnegative for SQRT). */
581 int flag_unsafe_math_optimizations
= 0;
583 /* Nonzero means that no NaNs or +-Infs are expected. */
585 int flag_finite_math_only
= 0;
587 /* Zero means that floating-point math operations cannot generate a
588 (user-visible) trap. This is the case, for example, in nonstop
589 IEEE 754 arithmetic. Trapping conditions include division by zero,
590 overflow, underflow, invalid and inexact, but does not include
591 operations on signaling NaNs (see below). */
593 int flag_trapping_math
= 1;
595 /* Nonzero means disable transformations observable by signaling NaNs.
596 This option implies that any operation on a IEEE signaling NaN can
597 generate a (user-visible) trap. */
599 int flag_signaling_nans
= 0;
601 /* 0 means straightforward implementation of complex divide acceptable.
602 1 means wide ranges of inputs must work for complex divide.
603 2 means C99-like requirements for complex divide (not yet implemented). */
605 int flag_complex_divide_method
= 0;
607 /* Nonzero means all references through pointers are volatile. */
611 /* Nonzero means treat all global and extern variables as volatile. */
613 int flag_volatile_global
;
615 /* Nonzero means treat all static variables as volatile. */
617 int flag_volatile_static
;
619 /* Nonzero means just do syntax checking; don't output anything. */
621 int flag_syntax_only
= 0;
623 /* Nonzero means perform global cse. */
625 static int flag_gcse
;
627 /* Nonzero means perform loop optimizer. */
629 static int flag_loop_optimize
;
631 /* Nonzero means perform crossjumping. */
633 static int flag_crossjumping
;
635 /* Nonzero means perform if conversion. */
637 static int flag_if_conversion
;
639 /* Nonzero means perform if conversion after reload. */
641 static int flag_if_conversion2
;
643 /* Nonzero means to use global dataflow analysis to eliminate
644 useless null pointer tests. */
646 static int flag_delete_null_pointer_checks
;
648 /* Nonzero means to do the enhanced load motion during gcse, which trys
649 to hoist loads by not killing them when a store to the same location
652 int flag_gcse_lm
= 1;
654 /* Nonzero means to perform store motion after gcse, which will try to
655 move stores closer to the exit block. Its not very effective without
658 int flag_gcse_sm
= 1;
660 /* Nonzero means to rerun cse after loop optimization. This increases
661 compilation time about 20% and picks up a few more common expressions. */
663 static int flag_rerun_cse_after_loop
;
665 /* Nonzero means to run loop optimizations twice. */
667 int flag_rerun_loop_opt
;
669 /* Nonzero for -finline-functions: ok to inline functions that look like
670 good inline candidates. */
672 int flag_inline_functions
;
674 /* Nonzero for -fkeep-inline-functions: even if we make a function
675 go inline everywhere, keep its definition around for debugging
678 int flag_keep_inline_functions
;
680 /* Nonzero means that functions will not be inlined. */
682 int flag_no_inline
= 2;
684 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
685 not just because the tree inliner turned us off. */
687 int flag_really_no_inline
= 2;
689 /* Nonzero means that we should emit static const variables
690 regardless of whether or not optimization is turned on. */
692 int flag_keep_static_consts
= 1;
694 /* Nonzero means we should be saving declaration info into a .X file. */
696 int flag_gen_aux_info
= 0;
698 /* Specified name of aux-info file. */
700 static char *aux_info_file_name
;
702 /* Nonzero means make the text shared if supported. */
704 int flag_shared_data
;
706 /* Nonzero means schedule into delayed branch slots if supported. */
708 int flag_delayed_branch
;
710 /* Nonzero if we are compiling pure (sharable) code.
711 Value is 1 if we are doing "small" pic; value is 2 if we're doing
716 /* Set to the default thread-local storage (tls) model to use. */
718 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
720 /* Nonzero means generate extra code for exception handling and enable
721 exception handling. */
725 /* Nonzero means generate frame unwind info table when supported. */
727 int flag_unwind_tables
= 0;
729 /* Nonzero means generate frame unwind info table exact at each insn boundary */
731 int flag_asynchronous_unwind_tables
= 0;
733 /* Nonzero means don't place uninitialized global data in common storage
738 /* Nonzero means change certain warnings into errors.
739 Usually these are warnings about failure to conform to some standard. */
741 int flag_pedantic_errors
= 0;
743 /* flag_schedule_insns means schedule insns within basic blocks (before
745 flag_schedule_insns_after_reload means schedule insns after
748 int flag_schedule_insns
= 0;
749 int flag_schedule_insns_after_reload
= 0;
751 /* The following flags have effect only for scheduling before register
754 flag_schedule_interblock means schedule insns accross basic blocks.
755 flag_schedule_speculative means allow speculative motion of non-load insns.
756 flag_schedule_speculative_load means allow speculative motion of some
758 flag_schedule_speculative_load_dangerous allows speculative motion of more
761 int flag_schedule_interblock
= 1;
762 int flag_schedule_speculative
= 1;
763 int flag_schedule_speculative_load
= 0;
764 int flag_schedule_speculative_load_dangerous
= 0;
766 int flag_single_precision_constant
;
768 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
769 by a cheaper branch on a count register. */
770 int flag_branch_on_count_reg
= 1;
772 /* -finhibit-size-directive inhibits output of .size for ELF.
773 This is used only for compiling crtstuff.c,
774 and it may be extended to other effects
775 needed for crtstuff.c on other systems. */
776 int flag_inhibit_size_directive
= 0;
778 /* -fverbose-asm causes extra commentary information to be produced in
779 the generated assembly code (to make it more readable). This option
780 is generally only of use to those who actually need to read the
781 generated assembly code (perhaps while debugging the compiler itself).
782 -fno-verbose-asm, the default, causes the extra information
783 to be omitted and is useful when comparing two assembler files. */
785 int flag_verbose_asm
= 0;
787 /* -dA causes debug commentary information to be produced in
788 the generated assembly code (to make it more readable). This option
789 is generally only of use to those who actually need to read the
790 generated assembly code (perhaps while debugging the compiler itself).
791 Currently, this switch is only used by dwarfout.c; however, it is intended
792 to be a catchall for printing debug information in the assembler file. */
794 int flag_debug_asm
= 0;
796 /* -dP causes the rtl to be emitted as a comment in assembly. */
798 int flag_dump_rtl_in_asm
= 0;
800 /* -fgnu-linker specifies use of the GNU linker for initializations.
801 (Or, more generally, a linker that handles initializations.)
802 -fno-gnu-linker says that collect2 will be used. */
804 int flag_gnu_linker
= 0;
806 int flag_gnu_linker
= 1;
809 /* Nonzero means put zero initialized data in the bss section. */
810 int flag_zero_initialized_in_bss
= 1;
815 /* Enable ssa conditional constant propagation. */
816 int flag_ssa_ccp
= 0;
818 /* Enable ssa aggressive dead code elimination. */
819 int flag_ssa_dce
= 0;
821 /* Tag all structures with __attribute__(packed). */
822 int flag_pack_struct
= 0;
824 /* Emit code to check for stack overflow; also may cause large objects
825 to be allocated dynamically. */
826 int flag_stack_check
;
828 /* When non-NULL, indicates that whenever space is allocated on the
829 stack, the resulting stack pointer must not pass this
830 address---that is, for stacks that grow downward, the stack pointer
831 must always be greater than or equal to this address; for stacks
832 that grow upward, the stack pointer must be less than this address.
833 At present, the rtx may be either a REG or a SYMBOL_REF, although
834 the support provided depends on the backend. */
837 /* 0 if pointer arguments may alias each other. True in C.
838 1 if pointer arguments may not alias each other but may alias
840 2 if pointer arguments may not alias each other and may not
841 alias global variables. True in Fortran.
842 This defaults to 0 for C. */
843 int flag_argument_noalias
= 0;
845 /* Nonzero if we should do (language-dependent) alias analysis.
846 Typically, this analysis will assume that expressions of certain
847 types do not alias expressions of certain other types. Only used
848 if alias analysis (in general) is enabled. */
849 int flag_strict_aliasing
= 0;
851 /* Instrument functions with calls at entry and exit, for profiling. */
852 int flag_instrument_function_entry_exit
= 0;
854 /* Nonzero means ignore `#ident' directives. 0 means handle them.
855 On SVR4 targets, it also controls whether or not to emit a
856 string identifying the compiler. */
858 int flag_no_ident
= 0;
860 /* This will perform a peephole pass before sched2. */
861 int flag_peephole2
= 0;
863 /* This will try to guess branch probabilities. */
864 int flag_guess_branch_prob
= 0;
866 /* -fbounded-pointers causes gcc to compile pointers as composite
867 objects occupying three words: the pointer value, the base address
868 of the referent object, and the address immediately beyond the end
869 of the referent object. The base and extent allow us to perform
870 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
871 int flag_bounded_pointers
= 0;
873 /* -fcheck-bounds causes gcc to generate array bounds checks.
874 For C, C++: defaults to value of flag_bounded_pointers.
875 For ObjC: defaults to off.
876 For Java: defaults to on.
877 For Fortran: defaults to off.
878 For CHILL: defaults to off. */
879 int flag_bounds_check
= 0;
881 /* This will attempt to merge constant section constants, if 1 only
882 string constants and constants from constant pool, if 2 also constant
884 int flag_merge_constants
= 1;
886 /* If one, renumber instruction UIDs to reduce the number of
887 unused UIDs if there are a lot of instructions. If greater than
888 one, unconditionally renumber instruction UIDs. */
889 int flag_renumber_insns
= 1;
891 /* If nonzero, use the graph coloring register allocator. */
892 int flag_new_regalloc
= 0;
894 /* Nonzero if we perform superblock formation. */
898 /* Values of the -falign-* flags: how much to align labels in code.
899 0 means `use default', 1 means `don't align'.
900 For each variable, there is an _log variant which is the power
901 of two not less than the variable, for .align output. */
905 int align_loops_max_skip
;
908 int align_jumps_max_skip
;
910 int align_labels_log
;
911 int align_labels_max_skip
;
913 int align_functions_log
;
915 /* Like align_functions_log above, but used by front-ends to force the
916 minimum function alignment. Zero means no alignment is forced. */
917 int force_align_functions_log
;
919 /* Table of supported debugging formats. */
922 const char *const arg
;
923 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
924 constant expression, we use NO_DEBUG in its place. */
925 const enum debug_info_type debug_type
;
926 const int use_extensions_p
;
927 const char *const description
;
931 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
932 N_("Generate debugging info in default format") },
933 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
934 #ifdef DBX_DEBUGGING_INFO
935 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
936 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
938 #ifdef DWARF_DEBUGGING_INFO
939 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
940 { "dwarf+", DWARF_DEBUG
, 1,
941 N_("Generate extended DWARF-1 format debug info") },
943 #ifdef DWARF2_DEBUGGING_INFO
944 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
946 #ifdef XCOFF_DEBUGGING_INFO
947 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
948 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
950 #ifdef SDB_DEBUGGING_INFO
951 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
953 #ifdef VMS_DEBUGGING_INFO
954 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
961 const char *const string
;
964 const char *const description
;
966 lang_independent_options
;
970 /* Add or remove a leading underscore from user symbols. */
971 int flag_leading_underscore
= -1;
973 /* The user symbol prefix after having resolved same. */
974 const char *user_label_prefix
;
976 static const param_info lang_independent_params
[] = {
977 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
978 { OPTION, DEFAULT, HELP },
979 #include "params.def"
984 /* Table of language-independent -f options.
985 STRING is the option name. VARIABLE is the address of the variable.
986 ON_VALUE is the value to store in VARIABLE
987 if `-fSTRING' is seen as an option.
988 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
990 static const lang_independent_options f_options
[] =
992 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
993 N_("Perform DWARF2 duplicate elimination") },
994 {"float-store", &flag_float_store
, 1,
995 N_("Do not store floats in registers") },
996 {"volatile", &flag_volatile
, 1,
997 N_("Consider all mem refs through pointers as volatile") },
998 {"volatile-global", &flag_volatile_global
, 1,
999 N_("Consider all mem refs to global data to be volatile") },
1000 {"volatile-static", &flag_volatile_static
, 1,
1001 N_("Consider all mem refs to static data to be volatile") },
1002 {"defer-pop", &flag_defer_pop
, 1,
1003 N_("Defer popping functions args from stack until later") },
1004 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1005 N_("When possible do not generate stack frames") },
1006 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1007 N_("Optimize sibling and tail recursive calls") },
1008 {"tracer", &flag_tracer
, 1,
1009 N_("Perform superblock formation via tail duplication") },
1010 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1011 N_("When running CSE, follow jumps to their targets") },
1012 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1013 N_("When running CSE, follow conditional jumps") },
1014 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1015 N_("Perform a number of minor, expensive optimizations") },
1016 {"thread-jumps", &flag_thread_jumps
, 1,
1017 N_("Perform jump threading optimizations") },
1018 {"strength-reduce", &flag_strength_reduce
, 1,
1019 N_("Perform strength reduction optimizations") },
1020 {"unroll-loops", &flag_unroll_loops
, 1,
1021 N_("Perform loop unrolling when iteration count is known") },
1022 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1023 N_("Perform loop unrolling for all loops") },
1024 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
1025 N_("Generate prefetch instructions, if available, for arrays in loops") },
1026 {"move-all-movables", &flag_move_all_movables
, 1,
1027 N_("Force all loop invariant computations out of loops") },
1028 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1029 N_("Strength reduce all loop general induction variables") },
1030 {"writable-strings", &flag_writable_strings
, 1,
1031 N_("Store strings in writable data section") },
1032 {"peephole", &flag_no_peephole
, 0,
1033 N_("Enable machine specific peephole optimizations") },
1034 {"force-mem", &flag_force_mem
, 1,
1035 N_("Copy memory operands into registers before using") },
1036 {"force-addr", &flag_force_addr
, 1,
1037 N_("Copy memory address constants into regs before using") },
1038 {"function-cse", &flag_no_function_cse
, 0,
1039 N_("Allow function addresses to be held in registers") },
1040 {"inline-functions", &flag_inline_functions
, 1,
1041 N_("Integrate simple functions into their callers") },
1042 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1043 N_("Generate code for funcs even if they are fully inlined") },
1044 {"inline", &flag_no_inline
, 0,
1045 N_("Pay attention to the 'inline' keyword") },
1046 {"keep-static-consts", &flag_keep_static_consts
, 1,
1047 N_("Emit static const variables even if they are not used") },
1048 {"syntax-only", &flag_syntax_only
, 1,
1049 N_("Check for syntax errors, then stop") },
1050 {"shared-data", &flag_shared_data
, 1,
1051 N_("Mark data as shared rather than private") },
1052 {"caller-saves", &flag_caller_saves
, 1,
1053 N_("Enable saving registers around function calls") },
1054 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1055 N_("Return 'short' aggregates in memory, not registers") },
1056 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1057 N_("Return 'short' aggregates in registers") },
1058 {"delayed-branch", &flag_delayed_branch
, 1,
1059 N_("Attempt to fill delay slots of branch instructions") },
1060 {"gcse", &flag_gcse
, 1,
1061 N_("Perform the global common subexpression elimination") },
1062 {"gcse-lm", &flag_gcse_lm
, 1,
1063 N_("Perform enhanced load motion during global subexpression elimination") },
1064 {"gcse-sm", &flag_gcse_sm
, 1,
1065 N_("Perform store motion after global subexpression elimination") },
1066 {"loop-optimize", &flag_loop_optimize
, 1,
1067 N_("Perform the loop optimizations") },
1068 {"crossjumping", &flag_crossjumping
, 1,
1069 N_("Perform cross-jumping optimization") },
1070 {"if-conversion", &flag_if_conversion
, 1,
1071 N_("Perform conversion of conditional jumps to branchless equivalents") },
1072 {"if-conversion2", &flag_if_conversion2
, 1,
1073 N_("Perform conversion of conditional jumps to conditional execution") },
1074 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1075 N_("Run CSE pass after loop optimizations") },
1076 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1077 N_("Run the loop optimizer twice") },
1078 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1079 N_("Delete useless null pointer checks") },
1080 {"schedule-insns", &flag_schedule_insns
, 1,
1081 N_("Reschedule instructions before register allocation") },
1082 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1083 N_("Reschedule instructions after register allocation") },
1084 {"sched-interblock",&flag_schedule_interblock
, 1,
1085 N_("Enable scheduling across basic blocks") },
1086 {"sched-spec",&flag_schedule_speculative
, 1,
1087 N_("Allow speculative motion of non-loads") },
1088 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1089 N_("Allow speculative motion of some loads") },
1090 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1091 N_("Allow speculative motion of more loads") },
1092 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1093 N_("Replace add,compare,branch with branch on count reg") },
1094 {"pic", &flag_pic
, 1,
1095 N_("Generate position independent code, if possible") },
1096 {"PIC", &flag_pic
, 2, ""},
1097 {"exceptions", &flag_exceptions
, 1,
1098 N_("Enable exception handling") },
1099 {"unwind-tables", &flag_unwind_tables
, 1,
1100 N_("Just generate unwind tables for exception handling") },
1101 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1102 N_("Generate unwind tables exact at each instruction boundary") },
1103 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1104 N_("Support synchronous non-call exceptions") },
1105 {"profile-arcs", &profile_arc_flag
, 1,
1106 N_("Insert arc based program profiling code") },
1107 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs
, 1,
1108 N_("Avoid thread safety profiling overhead") },
1109 {"test-coverage", &flag_test_coverage
, 1,
1110 N_("Create data files needed by gcov") },
1111 {"branch-probabilities", &flag_branch_probabilities
, 1,
1112 N_("Use profiling information for branch probabilities") },
1113 {"profile", &profile_flag
, 1,
1114 N_("Enable basic program profiling code") },
1115 {"reorder-blocks", &flag_reorder_blocks
, 1,
1116 N_("Reorder basic blocks to improve code placement") },
1117 {"reorder-functions", &flag_reorder_functions
, 1,
1118 N_("Reorder functions to improve code placement") },
1119 {"rename-registers", &flag_rename_registers
, 1,
1120 N_("Do the register renaming optimization pass") },
1121 {"cprop-registers", &flag_cprop_registers
, 1,
1122 N_("Do the register copy-propagation optimization pass") },
1123 {"common", &flag_no_common
, 0,
1124 N_("Do not put uninitialized globals in the common section") },
1125 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1126 N_("Do not generate .size directives") },
1127 {"function-sections", &flag_function_sections
, 1,
1128 N_("place each function into its own section") },
1129 {"data-sections", &flag_data_sections
, 1,
1130 N_("place data items into their own section") },
1131 {"verbose-asm", &flag_verbose_asm
, 1,
1132 N_("Add extra commentry to assembler output") },
1133 {"gnu-linker", &flag_gnu_linker
, 1,
1134 N_("Output GNU ld formatted global initializers") },
1135 {"regmove", &flag_regmove
, 1,
1136 N_("Enables a register move optimization") },
1137 {"optimize-register-move", &flag_regmove
, 1,
1138 N_("Do the full regmove optimization pass") },
1139 {"pack-struct", &flag_pack_struct
, 1,
1140 N_("Pack structure members together without holes") },
1141 {"stack-check", &flag_stack_check
, 1,
1142 N_("Insert stack checking code into the program") },
1143 {"argument-alias", &flag_argument_noalias
, 0,
1144 N_("Specify that arguments may alias each other & globals") },
1145 {"argument-noalias", &flag_argument_noalias
, 1,
1146 N_("Assume arguments may alias globals but not each other") },
1147 {"argument-noalias-global", &flag_argument_noalias
, 2,
1148 N_("Assume arguments do not alias each other or globals") },
1149 {"strict-aliasing", &flag_strict_aliasing
, 1,
1150 N_("Assume strict aliasing rules apply") },
1151 {"align-loops", &align_loops
, 0,
1152 N_("Align the start of loops") },
1153 {"align-jumps", &align_jumps
, 0,
1154 N_("Align labels which are only reached by jumping") },
1155 {"align-labels", &align_labels
, 0,
1156 N_("Align all labels") },
1157 {"align-functions", &align_functions
, 0,
1158 N_("Align the start of functions") },
1159 {"merge-constants", &flag_merge_constants
, 1,
1160 N_("Attempt to merge identical constants accross compilation units") },
1161 {"merge-all-constants", &flag_merge_constants
, 2,
1162 N_("Attempt to merge identical constants and constant variables") },
1163 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1164 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1165 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1166 N_("Instrument function entry/exit with profiling calls") },
1167 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1,
1168 N_("Put zero initialized data in the bss section") },
1169 {"ssa", &flag_ssa
, 1,
1170 N_("Enable SSA optimizations") },
1171 {"ssa-ccp", &flag_ssa_ccp
, 1,
1172 N_("Enable SSA conditional constant propagation") },
1173 {"ssa-dce", &flag_ssa_dce
, 1,
1174 N_("Enable aggressive SSA dead code elimination") },
1175 {"leading-underscore", &flag_leading_underscore
, 1,
1176 N_("External symbols have a leading underscore") },
1177 {"ident", &flag_no_ident
, 0,
1178 N_("Process #ident directives") },
1179 { "peephole2", &flag_peephole2
, 1,
1180 N_("Enables an rtl peephole pass run before sched2") },
1181 {"finite-math-only", &flag_finite_math_only
, 1,
1182 N_("Assume no NaNs or +-Infs are generated") },
1183 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1184 N_("Enables guessing of branch probabilities") },
1185 {"math-errno", &flag_errno_math
, 1,
1186 N_("Set errno after built-in math functions") },
1187 {"trapping-math", &flag_trapping_math
, 1,
1188 N_("Floating-point operations can trap") },
1189 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1190 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1191 {"signaling-nans", &flag_signaling_nans
, 1,
1192 N_("Disable optimizations observable by IEEE signaling NaNs") },
1193 {"bounded-pointers", &flag_bounded_pointers
, 1,
1194 N_("Compile pointers as triples: value, base & end") },
1195 {"bounds-check", &flag_bounds_check
, 1,
1196 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1197 {"single-precision-constant", &flag_single_precision_constant
, 1,
1198 N_("Convert floating point constant to single precision constant") },
1199 {"time-report", &time_report
, 1,
1200 N_("Report time taken by each compiler pass at end of run") },
1201 {"mem-report", &mem_report
, 1,
1202 N_("Report on permanent memory allocation at end of run") },
1203 { "trapv", &flag_trapv
, 1,
1204 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1205 { "new-ra", &flag_new_regalloc
, 1,
1206 N_("Use graph coloring register allocation.") },
1209 /* Table of language-specific options. */
1211 static const struct lang_opt
1213 const char *const option
;
1214 const char *const description
;
1216 documented_lang_options
[] =
1218 /* In order not to overload the --help output, the convention
1219 used here is to only describe those options which are not
1220 enabled by default. */
1223 N_("Compile just for ISO C90") },
1225 N_("Determine language standard") },
1227 { "-fsigned-bitfields", "" },
1228 { "-funsigned-bitfields",
1229 N_("Make bit-fields by unsigned by default") },
1230 { "-fno-signed-bitfields", "" },
1231 { "-fno-unsigned-bitfields","" },
1233 N_("Make 'char' be signed by default") },
1234 { "-funsigned-char",
1235 N_("Make 'char' be unsigned by default") },
1236 { "-fno-signed-char", "" },
1237 { "-fno-unsigned-char", "" },
1241 N_("Do not recognize the 'asm' keyword") },
1242 { "-fbuiltin", "" },
1244 N_("Do not recognize any built in functions") },
1246 N_("Assume normal C execution environment") },
1247 { "-fno-hosted", "" },
1249 N_("Assume that standard libraries & main might not exist") },
1250 { "-fno-freestanding", "" },
1251 { "-fcond-mismatch",
1252 N_("Allow different types as args of ? operator") },
1253 { "-fno-cond-mismatch", "" },
1254 { "-fdollars-in-identifiers",
1255 N_("Allow the use of $ inside identifiers") },
1256 { "-fno-dollars-in-identifiers", "" },
1257 { "-fpreprocessed", "" },
1258 { "-fno-preprocessed", "" },
1260 N_("Use the same size for double as for float") },
1261 { "-fno-short-double", "" },
1263 N_("Use the smallest fitting integer to hold enums") },
1264 { "-fno-short-enums", "" },
1266 N_("Override the underlying type for wchar_t to `unsigned short'") },
1267 { "-fno-short-wchar", "" },
1270 N_("Enable most warning messages") },
1271 { "-Wbad-function-cast",
1272 N_("Warn about casting functions to incompatible types") },
1273 { "-Wno-bad-function-cast", "" },
1274 { "-Wmissing-format-attribute",
1275 N_("Warn about functions which might be candidates for format attributes") },
1276 { "-Wno-missing-format-attribute", "" },
1278 N_("Warn about casts which discard qualifiers") },
1279 { "-Wno-cast-qual", "" },
1280 { "-Wchar-subscripts",
1281 N_("Warn about subscripts whose type is 'char'") },
1282 { "-Wno-char-subscripts", "" },
1284 N_("Warn if nested comments are detected") },
1285 { "-Wno-comment", "" },
1287 N_("Warn if nested comments are detected") },
1288 { "-Wno-comments", "" },
1290 N_("Warn about possibly confusing type conversions") },
1291 { "-Wno-conversion", "" },
1292 { "-Wdiv-by-zero", "" },
1293 { "-Wno-div-by-zero",
1294 N_("Do not warn about compile-time integer division by zero") },
1296 N_("Warn about testing equality of floating point numbers") },
1297 { "-Wno-float-equal", "" },
1299 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1300 { "-Wno-format", "" },
1301 { "-Wformat-extra-args", "" },
1302 { "-Wno-format-extra-args",
1303 N_("Don't warn about too many arguments to format functions") },
1304 { "-Wformat-nonliteral",
1305 N_("Warn about non-string-literal format strings") },
1306 { "-Wno-format-nonliteral", "" },
1307 { "-Wformat-security",
1308 N_("Warn about possible security problems with format functions") },
1309 { "-Wno-format-security", "" },
1310 { "-Wformat-y2k", "" },
1311 { "-Wno-format-y2k",
1312 N_("Don't warn about strftime formats yielding 2 digit years") },
1313 { "-Wimplicit-function-declaration",
1314 N_("Warn about implicit function declarations") },
1315 { "-Wno-implicit-function-declaration", "" },
1316 { "-Werror-implicit-function-declaration", "" },
1318 N_("Warn when a declaration does not specify a type") },
1319 { "-Wno-implicit-int", "" },
1320 { "-Wimplicit", "" },
1321 { "-Wno-implicit", "" },
1323 N_("Warn about the use of the #import directive") },
1324 { "-Wno-import", "" },
1325 { "-Wlong-long","" },
1327 N_("Do not warn about using 'long long' when -pedantic") },
1329 N_("Warn about suspicious declarations of main") },
1330 { "-Wno-main", "" },
1331 { "-Wmissing-braces",
1332 N_("Warn about possibly missing braces around initializers") },
1333 { "-Wno-missing-braces", "" },
1334 { "-Wmissing-declarations",
1335 N_("Warn about global funcs without previous declarations") },
1336 { "-Wno-missing-declarations", "" },
1337 { "-Wmissing-prototypes",
1338 N_("Warn about global funcs without prototypes") },
1339 { "-Wno-missing-prototypes", "" },
1341 N_("Warn about use of multicharacter literals") },
1342 { "-Wno-multichar", "" },
1343 { "-Wnested-externs",
1344 N_("Warn about externs not at file scope level") },
1345 { "-Wno-nested-externs", "" },
1347 N_("Warn about possible missing parentheses") },
1348 { "-Wno-parentheses", "" },
1349 { "-Wpointer-arith",
1350 N_("Warn about function pointer arithmetic") },
1351 { "-Wno-pointer-arith", "" },
1352 { "-Wredundant-decls",
1353 N_("Warn about multiple declarations of the same object") },
1354 { "-Wno-redundant-decls", "" },
1356 N_("Warn whenever a function's return-type defaults to int") },
1357 { "-Wno-return-type", "" },
1358 { "-Wsequence-point",
1359 N_("Warn about possible violations of sequence point rules") },
1360 { "-Wno-sequence-point", "" },
1362 N_("Warn about signed/unsigned comparisons") },
1363 { "-Wno-sign-compare", "" },
1364 { "-Wstrict-prototypes",
1365 N_("Warn about non-prototyped function decls") },
1366 { "-Wno-strict-prototypes", "" },
1368 N_("Warn about constructs whose meanings change in ISO C") },
1369 { "-Wno-traditional", "" },
1371 N_("Warn when trigraphs are encountered") },
1372 { "-Wno-trigraphs", "" },
1374 { "-Wno-undef", "" },
1375 { "-Wunknown-pragmas",
1376 N_("Warn about unrecognized pragmas") },
1377 { "-Wno-unknown-pragmas", "" },
1378 { "-Wwrite-strings",
1379 N_("Mark strings as 'const char *'") },
1380 { "-Wno-write-strings", "" },
1382 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1384 #include "options.h"
1388 /* Here is a table, controlled by the tm.h file, listing each -m switch
1389 and which bits in `target_switches' it should set or clear.
1390 If VALUE is positive, it is bits to set.
1391 If VALUE is negative, -VALUE is bits to clear.
1392 (The sign bit is not used so there is no confusion.) */
1396 const char *const name
;
1398 const char *const description
;
1400 target_switches
[] = TARGET_SWITCHES
;
1402 /* This table is similar, but allows the switch to have a value. */
1404 #ifdef TARGET_OPTIONS
1407 const char *const prefix
;
1408 const char **const variable
;
1409 const char *const description
;
1411 target_options
[] = TARGET_OPTIONS
;
1414 /* Options controlling warnings. */
1416 /* Don't print warning messages. -w. */
1418 int inhibit_warnings
= 0;
1420 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1422 int warn_system_headers
= 0;
1424 /* Print various extra warnings. -W. */
1426 int extra_warnings
= 0;
1428 /* Treat warnings as errors. -Werror. */
1430 int warnings_are_errors
= 0;
1432 /* Nonzero to warn about unused variables, functions et.al. */
1434 int warn_unused_function
;
1435 int warn_unused_label
;
1436 int warn_unused_parameter
;
1437 int warn_unused_variable
;
1438 int warn_unused_value
;
1440 /* Nonzero to warn about code which is never reached. */
1442 int warn_notreached
;
1444 /* Nonzero to warn about variables used before they are initialized. */
1446 int warn_uninitialized
;
1448 /* Nonzero means warn about all declarations which shadow others. */
1452 /* Warn if a switch on an enum, that does not have a default case,
1453 fails to have a case for every enum value. */
1457 /* Warn if a switch does not have a default case. */
1459 int warn_switch_default
;
1461 /* Warn if a switch on an enum fails to have a case for every enum
1462 value (regardless of the presence or otherwise of a default case). */
1464 int warn_switch_enum
;
1466 /* Nonzero means warn about function definitions that default the return type
1467 or that use a null return and have a return-type other than void. */
1469 int warn_return_type
;
1471 /* Nonzero means warn about pointer casts that increase the required
1472 alignment of the target type (and might therefore lead to a crash
1473 due to a misaligned access). */
1475 int warn_cast_align
;
1477 /* Nonzero means warn about any objects definitions whose size is larger
1478 than N bytes. Also want about function definitions whose returned
1479 values are larger than N bytes. The value N is in `larger_than_size'. */
1481 int warn_larger_than
;
1482 HOST_WIDE_INT larger_than_size
;
1484 /* Nonzero means warn if inline function is too large. */
1488 /* Warn if a function returns an aggregate,
1489 since there are often incompatible calling conventions for doing this. */
1491 int warn_aggregate_return
;
1493 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1497 /* Warn when gcc pads a structure to an alignment boundary. */
1501 /* Warn when an optimization pass is disabled. */
1503 int warn_disabled_optimization
;
1505 /* Warn about functions which might be candidates for attribute noreturn. */
1507 int warn_missing_noreturn
;
1509 /* Nonzero means warn about uses of __attribute__((deprecated))
1512 int warn_deprecated_decl
= 1;
1514 /* Nonzero means warn about constructs which might not be
1515 strict-aliasing safe. */
1517 int warn_strict_aliasing
;
1519 /* Likewise for -W. */
1521 static const lang_independent_options W_options
[] =
1523 {"unused-function", &warn_unused_function
, 1,
1524 N_("Warn when a function is unused") },
1525 {"unused-label", &warn_unused_label
, 1,
1526 N_("Warn when a label is unused") },
1527 {"unused-parameter", &warn_unused_parameter
, 1,
1528 N_("Warn when a function parameter is unused") },
1529 {"unused-variable", &warn_unused_variable
, 1,
1530 N_("Warn when a variable is unused") },
1531 {"unused-value", &warn_unused_value
, 1,
1532 N_("Warn when an expression value is unused") },
1533 {"system-headers", &warn_system_headers
, 1,
1534 N_("Do not suppress warnings from system headers") },
1535 {"error", &warnings_are_errors
, 1,
1536 N_("Treat all warnings as errors") },
1537 {"shadow", &warn_shadow
, 1,
1538 N_("Warn when one local variable shadows another") },
1539 {"switch", &warn_switch
, 1,
1540 N_("Warn about enumerated switches, with no default, missing a case") },
1541 {"switch-default", &warn_switch_default
, 1,
1542 N_("Warn about enumerated switches missing a default case") },
1543 {"switch-enum", &warn_switch_enum
, 1,
1544 N_("Warn about all enumerated switches missing a specific case") },
1545 {"aggregate-return", &warn_aggregate_return
, 1,
1546 N_("Warn about returning structures, unions or arrays") },
1547 {"cast-align", &warn_cast_align
, 1,
1548 N_("Warn about pointer casts which increase alignment") },
1549 {"unreachable-code", &warn_notreached
, 1,
1550 N_("Warn about code that will never be executed") },
1551 {"uninitialized", &warn_uninitialized
, 1,
1552 N_("Warn about uninitialized automatic variables") },
1553 {"inline", &warn_inline
, 1,
1554 N_("Warn when an inlined function cannot be inlined") },
1555 {"packed", &warn_packed
, 1,
1556 N_("Warn when the packed attribute has no effect on struct layout") },
1557 {"padded", &warn_padded
, 1,
1558 N_("Warn when padding is required to align struct members") },
1559 {"disabled-optimization", &warn_disabled_optimization
, 1,
1560 N_("Warn when an optimization pass is disabled") },
1561 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1562 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1563 {"missing-noreturn", &warn_missing_noreturn
, 1,
1564 N_("Warn about functions which might be candidates for attribute noreturn") },
1565 {"strict-aliasing", &warn_strict_aliasing
, 1,
1566 N_ ("Warn about code which might break the strict aliasing rules") }
1570 set_Wunused (setting
)
1573 warn_unused_function
= setting
;
1574 warn_unused_label
= setting
;
1575 /* Unused function parameter warnings are reported when either ``-W
1576 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1577 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1579 warn_unused_parameter
= 0;
1580 else if (!warn_unused_parameter
)
1581 warn_unused_parameter
= -1;
1582 warn_unused_variable
= setting
;
1583 warn_unused_value
= setting
;
1586 /* The following routines are useful in setting all the flags that
1587 -ffast-math and -fno-fast-math imply. */
1590 set_fast_math_flags (set
)
1593 flag_trapping_math
= !set
;
1594 flag_unsafe_math_optimizations
= set
;
1595 flag_finite_math_only
= set
;
1596 flag_errno_math
= !set
;
1598 flag_signaling_nans
= 0;
1601 /* Return true iff flags are set as if -ffast-math. */
1603 fast_math_flags_set_p ()
1605 return (!flag_trapping_math
1606 && flag_unsafe_math_optimizations
1607 && flag_finite_math_only
1608 && !flag_errno_math
);
1612 /* Output files for assembler code (real compiler output)
1613 and debugging dumps. */
1616 FILE *aux_info_file
;
1617 FILE *rtl_dump_file
= NULL
;
1619 /* Decode the string P as an integral parameter.
1620 If the string is indeed an integer return its numeric value else
1621 issue an Invalid Option error for the option PNAME and return DEFVAL.
1622 If PNAME is zero just return DEFVAL, do not call error. */
1625 read_integral_parameter (p
, pname
, defval
)
1630 const char *endp
= p
;
1634 if (ISDIGIT (*endp
))
1643 error ("invalid option `%s'", pname
);
1650 /* This calls abort and is used to avoid problems when abort is a macro.
1651 It is used when we need to pass the address of abort. */
1659 /* When `malloc.c' is compiled with `rcheck' defined,
1660 it calls this function to report clobberage. */
1664 const char *s ATTRIBUTE_UNUSED
;
1669 /* Return the logarithm of X, base 2, considering X unsigned,
1670 if X is a power of 2. Otherwise, returns -1.
1672 This should be used via the `exact_log2' macro. */
1676 unsigned HOST_WIDE_INT x
;
1679 /* Test for 0 or a power of 2. */
1680 if (x
== 0 || x
!= (x
& -x
))
1682 while ((x
>>= 1) != 0)
1687 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1688 If X is 0, return -1.
1690 This should be used via the floor_log2 macro. */
1694 unsigned HOST_WIDE_INT x
;
1703 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1704 into ICE messages, which is much more user friendly. */
1707 crash_signal (signo
)
1710 internal_error ("%s", strsignal (signo
));
1713 /* Strip off a legitimate source ending from the input string NAME of
1714 length LEN. Rather than having to know the names used by all of
1715 our front ends, we strip off an ending of a period followed by
1716 up to five characters. (Java uses ".class".) */
1719 strip_off_ending (name
, len
)
1724 for (i
= 2; i
< 6 && len
> i
; i
++)
1726 if (name
[len
- i
] == '.')
1728 name
[len
- i
] = '\0';
1734 /* Output a quoted string. */
1737 output_quoted_string (asm_file
, string
)
1741 #ifdef OUTPUT_QUOTED_STRING
1742 OUTPUT_QUOTED_STRING (asm_file
, string
);
1746 putc ('\"', asm_file
);
1747 while ((c
= *string
++) != 0)
1751 if (c
== '\"' || c
== '\\')
1752 putc ('\\', asm_file
);
1756 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1758 putc ('\"', asm_file
);
1762 /* Output NAME into FILE after having turned it into something
1763 usable as an identifier in a target's assembly file. */
1765 output_clean_symbol_name (file
, name
)
1769 /* Make a copy of NAME. */
1770 char *id
= xstrdup (name
);
1772 /* Make it look like a valid identifier for an assembler. */
1773 clean_symbol_name (id
);
1780 /* Output a file name in the form wanted by System V. */
1783 output_file_directive (asm_file
, input_name
)
1785 const char *input_name
;
1787 int len
= strlen (input_name
);
1788 const char *na
= input_name
+ len
;
1790 /* NA gets INPUT_NAME sans directory names. */
1791 while (na
> input_name
)
1793 if (IS_DIR_SEPARATOR (na
[-1]))
1798 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1799 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1801 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1802 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1804 fprintf (asm_file
, "\t.file\t");
1805 output_quoted_string (asm_file
, na
);
1806 fputc ('\n', asm_file
);
1811 /* Routine to open a dump file. Return true if the dump file is enabled. */
1814 open_dump_file (index
, decl
)
1815 enum dump_file_index index
;
1819 const char *open_arg
;
1822 if (! dump_file
[index
].enabled
)
1825 timevar_push (TV_DUMP
);
1826 if (rtl_dump_file
!= NULL
)
1827 fclose (rtl_dump_file
);
1829 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1831 if (! dump_file
[index
].initialized
)
1833 /* If we've not initialized the files, do so now. */
1834 if (graph_dump_format
!= no_graph
1835 && dump_file
[index
].graph_dump_p
)
1837 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1838 clean_graph_dump_file (dump_base_name
, dump_name
);
1841 dump_file
[index
].initialized
= 1;
1847 dump_name
= concat (dump_base_name
, seq
,
1848 dump_file
[index
].extension
, NULL
);
1850 rtl_dump_file
= fopen (dump_name
, open_arg
);
1851 if (rtl_dump_file
== NULL
)
1852 fatal_io_error ("can't open %s", dump_name
);
1857 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1858 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1859 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1861 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1862 ? " (unlikely executed)"
1865 timevar_pop (TV_DUMP
);
1869 /* Routine to close a dump file. */
1872 close_dump_file (index
, func
, insns
)
1873 enum dump_file_index index
;
1874 void (*func
) PARAMS ((FILE *, rtx
));
1877 if (! rtl_dump_file
)
1880 timevar_push (TV_DUMP
);
1882 && graph_dump_format
!= no_graph
1883 && dump_file
[index
].graph_dump_p
)
1888 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1889 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1890 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1895 func (rtl_dump_file
, insns
);
1897 fflush (rtl_dump_file
);
1898 fclose (rtl_dump_file
);
1900 rtl_dump_file
= NULL
;
1901 timevar_pop (TV_DUMP
);
1904 /* Do any final processing required for the declarations in VEC, of
1905 which there are LEN. We write out inline functions and variables
1906 that have been deferred until this point, but which are required.
1907 Returns nonzero if anything was put out. */
1910 wrapup_global_declarations (vec
, len
)
1917 int output_something
= 0;
1919 for (i
= 0; i
< len
; i
++)
1923 /* We're not deferring this any longer. */
1924 DECL_DEFER_OUTPUT (decl
) = 0;
1926 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1927 (*lang_hooks
.finish_incomplete_decl
) (decl
);
1930 /* Now emit any global variables or functions that we have been
1931 putting off. We need to loop in case one of the things emitted
1932 here references another one which comes earlier in the list. */
1936 for (i
= 0; i
< len
; i
++)
1940 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1943 /* Don't write out static consts, unless we still need them.
1945 We also keep static consts if not optimizing (for debugging),
1946 unless the user specified -fno-keep-static-consts.
1947 ??? They might be better written into the debug information.
1948 This is possible when using DWARF.
1950 A language processor that wants static constants to be always
1951 written out (even if it is not used) is responsible for
1952 calling rest_of_decl_compilation itself. E.g. the C front-end
1953 calls rest_of_decl_compilation from finish_decl.
1954 One motivation for this is that is conventional in some
1955 environments to write things like:
1956 static const char rcsid[] = "... version string ...";
1957 intending to force the string to be in the executable.
1959 A language processor that would prefer to have unneeded
1960 static constants "optimized away" would just defer writing
1961 them out until here. E.g. C++ does this, because static
1962 constants are often defined in header files.
1964 ??? A tempting alternative (for both C and C++) would be
1965 to force a constant to be written if and only if it is
1966 defined in a main file, as opposed to an include file. */
1968 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1972 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1974 else if (DECL_COMDAT (decl
))
1976 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1977 && (optimize
|| !flag_keep_static_consts
1978 || DECL_ARTIFICIAL (decl
)))
1984 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1988 if (TREE_CODE (decl
) == FUNCTION_DECL
1989 && DECL_INITIAL (decl
) != 0
1990 && DECL_SAVED_INSNS (decl
) != 0
1991 && (flag_keep_inline_functions
1992 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1993 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1996 output_inline_function (decl
);
2001 output_something
= 1;
2005 return output_something
;
2008 /* Issue appropriate warnings for the global declarations in VEC (of
2009 which there are LEN). Output debugging information for them. */
2012 check_global_declarations (vec
, len
)
2019 for (i
= 0; i
< len
; i
++)
2023 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2024 && ! TREE_ASM_WRITTEN (decl
))
2025 /* Cancel the RTL for this decl so that, if debugging info
2026 output for global variables is still to come,
2027 this one will be omitted. */
2028 SET_DECL_RTL (decl
, NULL_RTX
);
2030 /* Warn about any function
2031 declared static but not defined.
2032 We don't warn about variables,
2033 because many programs have static variables
2034 that exist only to get some text into the object file. */
2035 if (TREE_CODE (decl
) == FUNCTION_DECL
2036 && (warn_unused_function
2037 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2038 && DECL_INITIAL (decl
) == 0
2039 && DECL_EXTERNAL (decl
)
2040 && ! DECL_ARTIFICIAL (decl
)
2041 && ! TREE_PUBLIC (decl
))
2043 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2044 pedwarn_with_decl (decl
,
2045 "`%s' used but never defined");
2047 warning_with_decl (decl
,
2048 "`%s' declared `static' but never defined");
2049 /* This symbol is effectively an "extern" declaration now. */
2050 TREE_PUBLIC (decl
) = 1;
2051 assemble_external (decl
);
2054 /* Warn about static fns or vars defined but not used. */
2055 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
2056 || (warn_unused_variable
&& TREE_CODE (decl
) == VAR_DECL
))
2057 && ! TREE_USED (decl
)
2058 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2059 to handle multiple external decls in different scopes. */
2060 && ! TREE_USED (DECL_NAME (decl
))
2061 && ! DECL_EXTERNAL (decl
)
2062 && ! TREE_PUBLIC (decl
)
2063 /* Global register variables must be declared to reserve them. */
2064 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
2065 /* Otherwise, ask the language. */
2066 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
2067 warning_with_decl (decl
, "`%s' defined but not used");
2069 timevar_push (TV_SYMOUT
);
2070 (*debug_hooks
->global_decl
) (decl
);
2071 timevar_pop (TV_SYMOUT
);
2075 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2076 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2077 INPUT_FILENAME and LINENO accordingly. */
2080 push_srcloc (file
, line
)
2084 struct file_stack
*fs
;
2086 if (input_file_stack
)
2088 input_file_stack
->name
= input_filename
;
2089 input_file_stack
->line
= lineno
;
2092 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2093 fs
->name
= input_filename
= file
;
2094 fs
->line
= lineno
= line
;
2095 fs
->next
= input_file_stack
;
2096 input_file_stack
= fs
;
2097 input_file_stack_tick
++;
2100 /* Pop the top entry off the stack of presently open source files.
2101 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2107 struct file_stack
*fs
;
2109 fs
= input_file_stack
;
2110 input_file_stack
= fs
->next
;
2112 input_file_stack_tick
++;
2113 /* The initial source file is never popped. */
2114 if (!input_file_stack
)
2116 input_filename
= input_file_stack
->name
;
2117 lineno
= input_file_stack
->line
;
2120 /* Compile an entire translation unit. Write a file of assembly
2121 output and various debugging dumps. */
2128 /* Initialize yet another pass. */
2130 init_final (main_input_filename
);
2131 init_branch_prob (aux_base_name
);
2133 timevar_push (TV_PARSE
);
2135 /* Call the parser, which parses the entire file (calling
2136 rest_of_compilation for each function). */
2137 (*lang_hooks
.parse_file
) (set_yydebug
);
2139 /* In case there were missing block closers,
2140 get us back to the global binding level. */
2141 (*lang_hooks
.clear_binding_stack
) ();
2143 /* Compilation is now finished except for writing
2144 what's left of the symbol table output. */
2145 timevar_pop (TV_PARSE
);
2147 if (flag_syntax_only
)
2150 globals
= (*lang_hooks
.decls
.getdecls
) ();
2152 /* Really define vars that have had only a tentative definition.
2153 Really output inline functions that must actually be callable
2154 and have not been output so far. */
2157 int len
= list_length (globals
);
2158 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2162 /* Process the decls in reverse order--earliest first.
2163 Put them into VEC from back to front, then take out from front. */
2165 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2166 vec
[len
- i
- 1] = decl
;
2168 wrapup_global_declarations (vec
, len
);
2170 /* This must occur after the loop to output deferred functions. Else
2171 the profiler initializer would not be emitted if all the functions
2172 in this compilation unit were deferred.
2174 output_func_start_profiler can not cause any additional functions or
2175 data to need to be output, so it need not be in the deferred function
2177 output_func_start_profiler ();
2179 check_global_declarations (vec
, len
);
2185 /* Write out any pending weak symbol declarations. */
2189 /* Do dbx symbols. */
2190 timevar_push (TV_SYMOUT
);
2192 #ifdef DWARF2_UNWIND_INFO
2193 if (dwarf2out_do_frame ())
2194 dwarf2out_frame_finish ();
2197 (*debug_hooks
->finish
) (main_input_filename
);
2198 timevar_pop (TV_SYMOUT
);
2200 /* Output some stuff at end of file if nec. */
2202 dw2_output_indirect_constants ();
2204 end_final (aux_base_name
);
2206 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2208 timevar_push (TV_DUMP
);
2209 open_dump_file (DFI_bp
, NULL
);
2213 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2214 timevar_pop (TV_DUMP
);
2218 ASM_FILE_END (asm_out_file
);
2221 /* Attach a special .ident directive to the end of the file to identify
2222 the version of GCC which compiled this code. The format of the .ident
2223 string is patterned after the ones produced by native SVR4 compilers. */
2226 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2227 IDENT_ASM_OP
, version_string
);
2230 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2232 timevar_push (TV_DUMP
);
2233 dump_combine_total_stats (rtl_dump_file
);
2234 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2235 timevar_pop (TV_DUMP
);
2239 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2240 and TYPE_DECL nodes.
2242 This does nothing for local (non-static) variables, unless the
2243 variable is a register variable with an ASMSPEC. In that case, or
2244 if the variable is not an automatic, it sets up the RTL and
2245 outputs any assembler code (label definition, storage allocation
2246 and initialization).
2248 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2249 the assembler symbol name to be used. TOP_LEVEL is nonzero
2250 if this declaration is not within a function. */
2253 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2255 const char *asmspec
;
2259 /* Declarations of variables, and of functions defined elsewhere. */
2261 /* The most obvious approach, to put an #ifndef around where
2262 this macro is used, doesn't work since it's inside a macro call. */
2263 #ifndef ASM_FINISH_DECLARE_OBJECT
2264 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2267 /* We deferred calling assemble_alias so that we could collect
2268 other attributes such as visibility. Emit the alias now. */
2271 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2274 alias
= TREE_VALUE (TREE_VALUE (alias
));
2275 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2276 assemble_alias (decl
, alias
);
2280 /* Forward declarations for nested functions are not "external",
2281 but we need to treat them as if they were. */
2282 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2283 || TREE_CODE (decl
) == FUNCTION_DECL
)
2285 timevar_push (TV_VARCONST
);
2288 make_decl_rtl (decl
, asmspec
);
2290 /* Don't output anything when a tentative file-scope definition
2291 is seen. But at end of compilation, do output code for them. */
2292 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2293 assemble_variable (decl
, top_level
, at_end
, 0);
2294 if (decl
== last_assemble_variable_decl
)
2296 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2300 timevar_pop (TV_VARCONST
);
2302 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2304 if (decode_reg_name (asmspec
) >= 0)
2306 SET_DECL_RTL (decl
, NULL_RTX
);
2307 make_decl_rtl (decl
, asmspec
);
2311 error ("invalid register name `%s' for register variable", asmspec
);
2312 DECL_REGISTER (decl
) = 0;
2317 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2318 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2319 && TREE_CODE (decl
) == TYPE_DECL
)
2321 timevar_push (TV_SYMOUT
);
2322 dbxout_symbol (decl
, 0);
2323 timevar_pop (TV_SYMOUT
);
2326 #ifdef SDB_DEBUGGING_INFO
2327 else if (write_symbols
== SDB_DEBUG
&& top_level
2328 && TREE_CODE (decl
) == TYPE_DECL
)
2330 timevar_push (TV_SYMOUT
);
2331 sdbout_symbol (decl
, 0);
2332 timevar_pop (TV_SYMOUT
);
2337 /* Called after finishing a record, union or enumeral type. */
2340 rest_of_type_compilation (type
, toplev
)
2341 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2345 tree type ATTRIBUTE_UNUSED
;
2346 int toplev ATTRIBUTE_UNUSED
;
2349 timevar_push (TV_SYMOUT
);
2350 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2351 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2352 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2354 #ifdef SDB_DEBUGGING_INFO
2355 if (write_symbols
== SDB_DEBUG
)
2356 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2358 #ifdef DWARF2_DEBUGGING_INFO
2359 if ((write_symbols
== DWARF2_DEBUG
2360 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2362 dwarf2out_decl (TYPE_STUB_DECL (type
));
2364 timevar_pop (TV_SYMOUT
);
2367 /* This is called from finish_function (within langhooks.parse_file)
2368 after each top-level definition is parsed.
2369 It is supposed to compile that function or variable
2370 and output the assembler code for it.
2371 After we return, the tree storage is freed. */
2374 rest_of_compilation (decl
)
2380 int rebuild_label_notes_after_reload
;
2381 int register_life_up_to_date
;
2383 timevar_push (TV_REST_OF_COMPILATION
);
2385 /* Now that we're out of the frontend, we shouldn't have any more
2386 CONCATs anywhere. */
2387 generating_concat_p
= 0;
2389 /* When processing delayed functions, prepare_function_start() won't
2390 have been run to re-initialize it. */
2391 cse_not_expected
= ! optimize
;
2393 /* First, make sure that NOTE_BLOCK is set correctly for each
2394 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2395 if (!cfun
->x_whole_function_mode_p
)
2398 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2399 tree in sensible shape. So, we just recalculate it here. */
2400 if (cfun
->x_whole_function_mode_p
)
2405 /* If we are reconsidering an inline function
2406 at the end of compilation, skip the stuff for making it inline. */
2408 if (DECL_SAVED_INSNS (decl
) == 0)
2414 /* If this is nested inside an inlined external function, pretend
2415 it was only declared. Since we cannot inline such functions,
2416 generating code for this one is not only not necessary but will
2417 confuse some debugging output writers. */
2418 for (parent
= DECL_CONTEXT (current_function_decl
);
2419 parent
!= NULL_TREE
;
2420 parent
= get_containing_scope (parent
))
2421 if (TREE_CODE (parent
) == FUNCTION_DECL
2422 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2424 DECL_INITIAL (decl
) = 0;
2425 goto exit_rest_of_compilation
;
2428 /* If requested, consider whether to make this function inline. */
2429 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2430 || flag_inline_functions
)
2432 timevar_push (TV_INTEGRATION
);
2433 lose
= function_cannot_inline_p (decl
);
2434 timevar_pop (TV_INTEGRATION
);
2435 if (lose
|| ! optimize
)
2437 if (warn_inline
&& DECL_INLINE (decl
))
2438 warning_with_decl (decl
, lose
);
2439 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2440 /* Don't really compile an extern inline function.
2441 If we can't make it inline, pretend
2442 it was only declared. */
2443 if (DECL_EXTERNAL (decl
))
2445 DECL_INITIAL (decl
) = 0;
2446 goto exit_rest_of_compilation
;
2450 /* ??? Note that this has the effect of making it look
2451 like "inline" was specified for a function if we choose
2452 to inline it. This isn't quite right, but it's
2453 probably not worth the trouble to fix. */
2454 inlinable
= DECL_INLINE (decl
) = 1;
2457 insns
= get_insns ();
2459 /* Dump the rtl code if we are dumping rtl. */
2461 if (open_dump_file (DFI_rtl
, decl
))
2463 if (DECL_SAVED_INSNS (decl
))
2464 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2465 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2468 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2469 sorts of eh initialization. Delay this until after the
2470 initial rtl dump so that we can see the original nesting. */
2471 convert_from_eh_region_ranges ();
2473 /* If function is inline, and we don't yet know whether to
2474 compile it by itself, defer decision till end of compilation.
2475 finish_compilation will call rest_of_compilation again
2476 for those functions that need to be output. Also defer those
2477 functions that we are supposed to defer. */
2480 || (DECL_INLINE (decl
)
2481 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2482 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2483 && ! flag_keep_inline_functions
)
2484 || DECL_EXTERNAL (decl
))))
2485 DECL_DEFER_OUTPUT (decl
) = 1;
2487 if (DECL_INLINE (decl
))
2488 /* DWARF wants separate debugging info for abstract and
2489 concrete instances of all inline functions, including those
2490 declared inline but not inlined, and those inlined even
2491 though they weren't declared inline. Conveniently, that's
2492 what DECL_INLINE means at this point. */
2493 (*debug_hooks
->deferred_inline_function
) (decl
);
2495 if (DECL_DEFER_OUTPUT (decl
))
2497 /* If -Wreturn-type, we have to do a bit of compilation. We just
2498 want to call cleanup the cfg to figure out whether or not we can
2499 fall off the end of the function; we do the minimum amount of
2500 work necessary to make that safe. */
2501 if (warn_return_type
)
2503 int saved_optimize
= optimize
;
2506 rebuild_jump_labels (insns
);
2507 find_exception_handler_labels ();
2508 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2509 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2510 optimize
= saved_optimize
;
2512 /* CFG is no longer maintained up-to-date. */
2513 free_bb_for_insn ();
2516 set_nothrow_function_flags ();
2517 if (current_function_nothrow
)
2518 /* Now we know that this can't throw; set the flag for the benefit
2519 of other functions later in this translation unit. */
2520 TREE_NOTHROW (current_function_decl
) = 1;
2522 timevar_push (TV_INTEGRATION
);
2523 save_for_inline (decl
);
2524 timevar_pop (TV_INTEGRATION
);
2525 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2526 goto exit_rest_of_compilation
;
2529 /* If specified extern inline but we aren't inlining it, we are
2530 done. This goes for anything that gets here with DECL_EXTERNAL
2531 set, not just things with DECL_INLINE. */
2532 if (DECL_EXTERNAL (decl
))
2533 goto exit_rest_of_compilation
;
2536 /* If we're emitting a nested function, make sure its parent gets
2537 emitted as well. Doing otherwise confuses debug info. */
2540 for (parent
= DECL_CONTEXT (current_function_decl
);
2541 parent
!= NULL_TREE
;
2542 parent
= get_containing_scope (parent
))
2543 if (TREE_CODE (parent
) == FUNCTION_DECL
)
2544 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
2547 /* We are now committed to emitting code for this function. Do any
2548 preparation, such as emitting abstract debug info for the inline
2549 before it gets mangled by optimization. */
2550 if (DECL_INLINE (decl
))
2551 (*debug_hooks
->outlining_inline_function
) (decl
);
2553 /* Remove any notes we don't need. That will make iterating
2554 over the instruction sequence faster, and allow the garbage
2555 collector to reclaim the memory used by the notes. */
2556 remove_unnecessary_notes ();
2561 /* Initialize some variables used by the optimizers. */
2562 init_function_for_compilation ();
2564 if (! DECL_DEFER_OUTPUT (decl
))
2565 TREE_ASM_WRITTEN (decl
) = 1;
2567 /* Now that integrate will no longer see our rtl, we need not
2568 distinguish between the return value of this function and the
2569 return value of called functions. Also, we can remove all SETs
2570 of subregs of hard registers; they are only here because of
2571 integrate. Also, we can now initialize pseudos intended to
2572 carry magic hard reg data throughout the function. */
2573 rtx_equal_function_value_matters
= 0;
2574 purge_hard_subreg_sets (get_insns ());
2576 /* Early return if there were errors. We can run afoul of our
2577 consistency checks, and there's not really much point in fixing them.
2578 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2579 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2580 || errorcount
|| sorrycount
)
2581 goto exit_rest_of_compilation
;
2583 timevar_push (TV_JUMP
);
2584 open_dump_file (DFI_sibling
, decl
);
2585 insns
= get_insns ();
2586 rebuild_jump_labels (insns
);
2587 find_exception_handler_labels ();
2588 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2590 delete_unreachable_blocks ();
2592 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2593 note_prediction_to_br_prob ();
2595 /* We may have potential sibling or tail recursion sites. Select one
2596 (of possibly multiple) methods of performing the call. */
2597 if (flag_optimize_sibling_calls
)
2600 optimize_sibling_and_tail_recursive_calls ();
2602 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2603 free_bb_for_insn ();
2604 find_exception_handler_labels ();
2605 rebuild_jump_labels (insns
);
2606 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2608 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2609 notes before simplifying cfg and we must do lowering after sibcall
2610 that unhides parts of RTL chain and cleans up the CFG.
2612 Until sibcall is replaced by tree-level optimizer, lets just
2613 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2614 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2615 if (GET_CODE (insn
) == NOTE
2616 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2619 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2620 timevar_pop (TV_JUMP
);
2622 scope_to_insns_initialize ();
2623 /* Complete generation of exception handling code. */
2626 timevar_push (TV_JUMP
);
2627 open_dump_file (DFI_eh
, decl
);
2629 finish_eh_generation ();
2631 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2632 timevar_pop (TV_JUMP
);
2635 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2636 generation, which might create new sets. */
2637 emit_initial_value_sets ();
2640 /* If we are doing position-independent code generation, now
2641 is the time to output special prologues and epilogues.
2642 We do not want to do this earlier, because it just clutters
2643 up inline functions with meaningless insns. */
2648 insns
= get_insns ();
2650 /* Copy any shared structure that should not be shared. */
2651 unshare_all_rtl (current_function_decl
, insns
);
2653 #ifdef SETJMP_VIA_SAVE_AREA
2654 /* This must be performed before virtual register instantiation.
2655 Please be aware the everything in the compiler that can look
2656 at the RTL up to this point must understand that REG_SAVE_AREA
2657 is just like a use of the REG contained inside. */
2658 if (current_function_calls_alloca
)
2659 optimize_save_area_alloca (insns
);
2662 /* Instantiate all virtual registers. */
2663 instantiate_virtual_regs (current_function_decl
, insns
);
2665 open_dump_file (DFI_jump
, decl
);
2667 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2668 are initialized and to compute whether control can drop off the end
2671 timevar_push (TV_JUMP
);
2672 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2673 before jump optimization switches branch directions. */
2674 expected_value_to_br_prob ();
2676 reg_scan (insns
, max_reg_num (), 0);
2677 rebuild_jump_labels (insns
);
2678 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2680 dump_flow_info (rtl_dump_file
);
2681 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
2682 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2684 /* CFG is no longer maintained up-to-date. */
2685 free_bb_for_insn ();
2686 copy_loop_headers (insns
);
2687 purge_line_number_notes (insns
);
2688 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2690 timevar_pop (TV_JUMP
);
2691 close_dump_file (DFI_jump
, print_rtl
, insns
);
2693 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2694 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2696 goto exit_rest_of_compilation
;
2699 /* Long term, this should probably move before the jump optimizer too,
2700 but I didn't want to disturb the rtl_dump_and_exit and related
2701 stuff at this time. */
2702 if (optimize
> 0 && flag_ssa
)
2704 /* Convert to SSA form. */
2706 timevar_push (TV_TO_SSA
);
2707 open_dump_file (DFI_ssa
, decl
);
2709 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2712 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2713 timevar_pop (TV_TO_SSA
);
2715 /* Perform sparse conditional constant propagation, if requested. */
2718 timevar_push (TV_SSA_CCP
);
2719 open_dump_file (DFI_ssa_ccp
, decl
);
2723 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2724 timevar_pop (TV_SSA_CCP
);
2727 /* It would be useful to cleanup the CFG at this point, but block
2728 merging and possibly other transformations might leave a PHI
2729 node in the middle of a basic block, which is a strict no-no. */
2731 /* The SSA implementation uses basic block numbers in its phi
2732 nodes. Thus, changing the control-flow graph or the basic
2733 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2734 may cause problems. */
2738 /* Remove dead code. */
2740 timevar_push (TV_SSA_DCE
);
2741 open_dump_file (DFI_ssa_dce
, decl
);
2743 insns
= get_insns ();
2744 ssa_eliminate_dead_code ();
2746 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2747 timevar_pop (TV_SSA_DCE
);
2750 /* Convert from SSA form. */
2752 timevar_push (TV_FROM_SSA
);
2753 open_dump_file (DFI_ussa
, decl
);
2755 convert_from_ssa ();
2756 /* New registers have been created. Rescan their usage. */
2757 reg_scan (insns
, max_reg_num (), 1);
2759 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2760 timevar_pop (TV_FROM_SSA
);
2765 timevar_push (TV_JUMP
);
2766 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
: 0);
2768 /* Try to identify useless null pointer tests and delete them. */
2769 if (flag_delete_null_pointer_checks
)
2771 open_dump_file (DFI_null
, decl
);
2773 dump_flow_info (rtl_dump_file
);
2775 if (delete_null_pointer_checks (insns
))
2776 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2778 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2781 /* Jump optimization, and the removal of NULL pointer checks, may
2782 have reduced the number of instructions substantially. CSE, and
2783 future passes, allocate arrays whose dimensions involve the
2784 maximum instruction UID, so if we can reduce the maximum UID
2785 we'll save big on memory. */
2786 renumber_insns (rtl_dump_file
);
2787 timevar_pop (TV_JUMP
);
2789 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
2793 /* Perform common subexpression elimination.
2794 Nonzero value from `cse_main' means that jumps were simplified
2795 and some code may now be unreachable, so do
2796 jump optimization again. */
2800 open_dump_file (DFI_cse
, decl
);
2802 dump_flow_info (rtl_dump_file
);
2803 timevar_push (TV_CSE
);
2805 reg_scan (insns
, max_reg_num (), 1);
2807 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2809 rebuild_jump_labels (insns
);
2810 purge_all_dead_edges (0);
2812 delete_trivially_dead_insns (insns
, max_reg_num ());
2814 /* If we are not running more CSE passes, then we are no longer
2815 expecting CSE to be run. But always rerun it in a cheap mode. */
2816 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2818 if (tem
|| optimize
> 1)
2819 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2820 /* Try to identify useless null pointer tests and delete them. */
2821 if (flag_delete_null_pointer_checks
)
2823 timevar_push (TV_JUMP
);
2825 if (delete_null_pointer_checks (insns
))
2826 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2827 timevar_pop (TV_JUMP
);
2830 /* The second pass of jump optimization is likely to have
2831 removed a bunch more instructions. */
2832 renumber_insns (rtl_dump_file
);
2834 timevar_pop (TV_CSE
);
2835 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2838 open_dump_file (DFI_addressof
, decl
);
2840 purge_addressof (insns
);
2842 purge_all_dead_edges (0);
2843 reg_scan (insns
, max_reg_num (), 1);
2845 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2849 /* Perform global cse. */
2851 if (optimize
> 0 && flag_gcse
)
2853 int save_csb
, save_cfj
;
2856 timevar_push (TV_GCSE
);
2857 open_dump_file (DFI_gcse
, decl
);
2859 tem
= gcse_main (insns
, rtl_dump_file
);
2860 rebuild_jump_labels (insns
);
2861 delete_trivially_dead_insns (insns
, max_reg_num ());
2863 save_csb
= flag_cse_skip_blocks
;
2864 save_cfj
= flag_cse_follow_jumps
;
2865 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2867 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2869 if (flag_expensive_optimizations
)
2871 timevar_push (TV_CSE
);
2872 reg_scan (insns
, max_reg_num (), 1);
2873 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2874 purge_all_dead_edges (0);
2875 delete_trivially_dead_insns (insns
, max_reg_num ());
2876 timevar_pop (TV_CSE
);
2877 cse_not_expected
= !flag_rerun_cse_after_loop
;
2880 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2881 things up. Then possibly re-run CSE again. */
2885 timevar_push (TV_JUMP
);
2886 rebuild_jump_labels (insns
);
2887 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2888 timevar_pop (TV_JUMP
);
2890 if (flag_expensive_optimizations
)
2892 timevar_push (TV_CSE
);
2893 reg_scan (insns
, max_reg_num (), 1);
2894 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2895 purge_all_dead_edges (0);
2896 delete_trivially_dead_insns (insns
, max_reg_num ());
2897 timevar_pop (TV_CSE
);
2901 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2902 timevar_pop (TV_GCSE
);
2905 flag_cse_skip_blocks
= save_csb
;
2906 flag_cse_follow_jumps
= save_cfj
;
2907 #ifdef ENABLE_CHECKING
2908 verify_flow_info ();
2912 /* Move constant computations out of loops. */
2914 if (optimize
> 0 && flag_loop_optimize
)
2916 int do_unroll
, do_prefetch
;
2918 timevar_push (TV_LOOP
);
2919 delete_dead_jumptables ();
2920 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2921 open_dump_file (DFI_loop
, decl
);
2922 /* CFG is no longer maintained up-to-date. */
2923 free_bb_for_insn ();
2925 do_unroll
= flag_unroll_loops
? LOOP_UNROLL
: LOOP_AUTO_UNROLL
;
2926 do_prefetch
= flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0;
2927 if (flag_rerun_loop_opt
)
2929 cleanup_barriers ();
2931 /* We only want to perform unrolling once. */
2932 loop_optimize (insns
, rtl_dump_file
, do_unroll
);
2935 /* The first call to loop_optimize makes some instructions
2936 trivially dead. We delete those instructions now in the
2937 hope that doing so will make the heuristics in loop work
2938 better and possibly speed up compilation. */
2939 delete_trivially_dead_insns (insns
, max_reg_num ());
2941 /* The regscan pass is currently necessary as the alias
2942 analysis code depends on this information. */
2943 reg_scan (insns
, max_reg_num (), 1);
2945 cleanup_barriers ();
2946 loop_optimize (insns
, rtl_dump_file
, do_unroll
| LOOP_BCT
| do_prefetch
);
2948 /* Loop can create trivially dead instructions. */
2949 delete_trivially_dead_insns (insns
, max_reg_num ());
2950 close_dump_file (DFI_loop
, print_rtl
, insns
);
2951 timevar_pop (TV_LOOP
);
2952 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2957 /* Do control and data flow analysis; wrote some of the results to
2960 timevar_push (TV_FLOW
);
2961 open_dump_file (DFI_cfg
, decl
);
2963 dump_flow_info (rtl_dump_file
);
2964 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0)
2965 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2967 /* It may make more sense to mark constant functions after dead code is
2968 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2969 may insert code making function non-constant, but we still must consider
2970 it as constant, otherwise -fbranch-probabilities will not read data back.
2972 life_analyzis rarely eliminates modification of external memory.
2975 mark_constant_function ();
2977 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2979 /* Do branch profiling and static profile estimation passes. */
2980 if (optimize
> 0 || cfun
->arc_profile
|| flag_branch_probabilities
)
2984 timevar_push (TV_BRANCH_PROB
);
2985 open_dump_file (DFI_bp
, decl
);
2986 if (cfun
->arc_profile
|| flag_branch_probabilities
)
2989 /* Discover and record the loop depth at the head of each basic
2990 block. The loop infrastructure does the real job for us. */
2991 flow_loops_find (&loops
, LOOP_TREE
);
2994 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2996 /* Estimate using heuristics if no profiling info is available. */
2997 if (flag_guess_branch_prob
)
2998 estimate_probability (&loops
);
3000 flow_loops_free (&loops
);
3001 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3002 timevar_pop (TV_BRANCH_PROB
);
3006 timevar_push (TV_TRACER
);
3007 open_dump_file (DFI_tracer
, decl
);
3009 dump_flow_info (rtl_dump_file
);
3010 cleanup_cfg (CLEANUP_EXPENSIVE
);
3012 cleanup_cfg (CLEANUP_EXPENSIVE
);
3013 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
3014 timevar_pop (TV_TRACER
);
3015 reg_scan (get_insns (), max_reg_num (), 0);
3020 timevar_push (TV_CSE2
);
3021 open_dump_file (DFI_cse2
, decl
);
3023 dump_flow_info (rtl_dump_file
);
3025 if (flag_rerun_cse_after_loop
)
3027 timevar_push (TV_JUMP
);
3029 reg_scan (insns
, max_reg_num (), 0);
3031 timevar_push (TV_IFCVT
);
3032 cleanup_cfg (CLEANUP_EXPENSIVE
);
3033 if (flag_if_conversion
)
3035 timevar_pop (TV_IFCVT
);
3037 timevar_pop (TV_JUMP
);
3038 /* CFG is no longer maintained up-to-date. */
3039 reg_scan (insns
, max_reg_num (), 0);
3040 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3041 purge_all_dead_edges (0);
3042 delete_trivially_dead_insns (insns
, max_reg_num ());
3046 timevar_push (TV_JUMP
);
3047 rebuild_jump_labels (insns
);
3048 cleanup_cfg (CLEANUP_EXPENSIVE
);
3049 timevar_pop (TV_JUMP
);
3053 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
3054 timevar_pop (TV_CSE2
);
3059 cse_not_expected
= 1;
3061 open_dump_file (DFI_life
, decl
);
3064 check_function_return_warnings ();
3066 #ifdef ENABLE_CHECKING
3067 verify_flow_info ();
3069 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3071 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
3072 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3073 timevar_pop (TV_FLOW
);
3077 if (warn_uninitialized
|| extra_warnings
)
3079 uninitialized_vars_warning (DECL_INITIAL (decl
));
3081 setjmp_args_warning ();
3087 if (!flag_new_regalloc
&& initialize_uninitialized_subregs ())
3089 /* Insns were inserted, so things might look a bit different. */
3090 insns
= get_insns ();
3091 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES
,
3092 PROP_LOG_LINKS
| PROP_REG_INFO
3093 | PROP_DEATH_NOTES
);
3097 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3101 /* If -opt, try combining insns through substitution. */
3105 int rebuild_jump_labels_after_combine
= 0;
3107 timevar_push (TV_COMBINE
);
3108 open_dump_file (DFI_combine
, decl
);
3110 rebuild_jump_labels_after_combine
3111 = combine_instructions (insns
, max_reg_num ());
3113 /* Combining insns may have turned an indirect jump into a
3114 direct jump. Rebuid the JUMP_LABEL fields of jumping
3116 if (rebuild_jump_labels_after_combine
)
3118 timevar_push (TV_JUMP
);
3119 rebuild_jump_labels (insns
);
3120 timevar_pop (TV_JUMP
);
3122 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3125 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3126 timevar_pop (TV_COMBINE
);
3131 /* Rerun if-conversion, as combine may have simplified things enough to
3132 now meet sequence length restrictions. */
3133 if (flag_if_conversion
)
3135 timevar_push (TV_IFCVT
);
3136 open_dump_file (DFI_ce
, decl
);
3142 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3143 timevar_pop (TV_IFCVT
);
3146 /* Register allocation pre-pass, to reduce number of moves
3147 necessary for two-address machines. */
3148 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3150 timevar_push (TV_REGMOVE
);
3151 open_dump_file (DFI_regmove
, decl
);
3153 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3155 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3156 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3157 timevar_pop (TV_REGMOVE
);
3162 /* Do unconditional splitting before register allocation to allow machine
3163 description to add extra information not needed previously. */
3164 split_all_insns (1);
3166 /* Any of the several passes since flow1 will have munged register
3167 lifetime data a bit. */
3168 register_life_up_to_date
= 0;
3170 #ifdef OPTIMIZE_MODE_SWITCHING
3171 timevar_push (TV_MODE_SWITCH
);
3174 optimize_mode_switching (NULL
);
3177 timevar_pop (TV_MODE_SWITCH
);
3180 timevar_push (TV_SCHED
);
3182 #ifdef INSN_SCHEDULING
3184 /* Print function header into sched dump now
3185 because doing the sched analysis makes some of the dump. */
3186 if (optimize
> 0 && flag_schedule_insns
)
3188 open_dump_file (DFI_sched
, decl
);
3190 /* Do control and data sched analysis,
3191 and write some of the results to dump file. */
3193 schedule_insns (rtl_dump_file
);
3195 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3197 /* Register lifetime information was updated as part of verifying
3199 register_life_up_to_date
= 1;
3202 timevar_pop (TV_SCHED
);
3206 /* Determine if the current function is a leaf before running reload
3207 since this can impact optimizations done by the prologue and
3208 epilogue thus changing register elimination offsets. */
3209 current_function_is_leaf
= leaf_function_p ();
3211 timevar_push (TV_LOCAL_ALLOC
);
3212 open_dump_file (DFI_lreg
, decl
);
3214 /* Allocate pseudo-regs that are used only within 1 basic block.
3216 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3217 jump optimizer after register allocation and reloading are finished. */
3219 if (! register_life_up_to_date
)
3220 recompute_reg_usage (insns
, ! optimize_size
);
3222 if (flag_new_regalloc
)
3224 delete_trivially_dead_insns (insns
, max_reg_num ());
3227 timevar_pop (TV_LOCAL_ALLOC
);
3228 if (dump_file
[DFI_lreg
].enabled
)
3230 timevar_push (TV_DUMP
);
3232 close_dump_file (DFI_lreg
, NULL
, NULL
);
3233 timevar_pop (TV_DUMP
);
3236 /* XXX clean up the whole mess to bring live info in shape again. */
3237 timevar_push (TV_GLOBAL_ALLOC
);
3238 open_dump_file (DFI_greg
, decl
);
3240 build_insn_chain (insns
);
3241 failure
= reload (insns
, 0);
3243 timevar_pop (TV_GLOBAL_ALLOC
);
3245 if (dump_file
[DFI_greg
].enabled
)
3247 timevar_push (TV_DUMP
);
3249 dump_global_regs (rtl_dump_file
);
3251 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3252 timevar_pop (TV_DUMP
);
3256 goto exit_rest_of_compilation
;
3257 reload_completed
= 1;
3258 rebuild_label_notes_after_reload
= 0;
3262 /* Allocate the reg_renumber array. */
3263 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3265 /* And the reg_equiv_memory_loc array. */
3266 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3268 allocate_initial_values (reg_equiv_memory_loc
);
3270 regclass (insns
, max_reg_num (), rtl_dump_file
);
3271 rebuild_label_notes_after_reload
= local_alloc ();
3273 timevar_pop (TV_LOCAL_ALLOC
);
3275 if (dump_file
[DFI_lreg
].enabled
)
3277 timevar_push (TV_DUMP
);
3279 dump_flow_info (rtl_dump_file
);
3280 dump_local_alloc (rtl_dump_file
);
3282 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3283 timevar_pop (TV_DUMP
);
3288 timevar_push (TV_GLOBAL_ALLOC
);
3289 open_dump_file (DFI_greg
, decl
);
3291 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3292 pass fixing up any insns that are invalid. */
3295 failure
= global_alloc (rtl_dump_file
);
3298 build_insn_chain (insns
);
3299 failure
= reload (insns
, 0);
3302 timevar_pop (TV_GLOBAL_ALLOC
);
3304 if (dump_file
[DFI_greg
].enabled
)
3306 timevar_push (TV_DUMP
);
3308 dump_global_regs (rtl_dump_file
);
3310 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3311 timevar_pop (TV_DUMP
);
3315 goto exit_rest_of_compilation
;
3320 open_dump_file (DFI_postreload
, decl
);
3322 /* Do a very simple CSE pass over just the hard registers. */
3325 timevar_push (TV_RELOAD_CSE_REGS
);
3326 reload_cse_regs (insns
);
3327 timevar_pop (TV_RELOAD_CSE_REGS
);
3330 /* Register allocation and reloading may have turned an indirect jump into
3331 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3332 jumping instructions. */
3333 if (rebuild_label_notes_after_reload
)
3335 timevar_push (TV_JUMP
);
3337 rebuild_jump_labels (insns
);
3338 purge_all_dead_edges (0);
3340 timevar_pop (TV_JUMP
);
3343 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3345 /* Re-create the death notes which were deleted during reload. */
3346 timevar_push (TV_FLOW2
);
3347 open_dump_file (DFI_flow2
, decl
);
3349 #ifdef ENABLE_CHECKING
3350 verify_flow_info ();
3353 /* If optimizing, then go ahead and split insns now. */
3355 split_all_insns (0);
3357 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3359 /* On some machines, the prologue and epilogue code, or parts thereof,
3360 can be represented as RTL. Doing so lets us schedule insns between
3361 it and the rest of the code and also allows delayed branch
3362 scheduling to operate in the epilogue. */
3363 thread_prologue_and_epilogue_insns (insns
);
3367 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3368 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3369 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3371 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3372 even for machines with possibly nonzero RETURN_POPS_ARGS
3373 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3374 push instructions will have popping returns. */
3375 #ifndef PUSH_ROUNDING
3376 if (!ACCUMULATE_OUTGOING_ARGS
)
3378 combine_stack_adjustments ();
3383 flow2_completed
= 1;
3385 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3386 timevar_pop (TV_FLOW2
);
3388 #ifdef HAVE_peephole2
3389 if (optimize
> 0 && flag_peephole2
)
3391 timevar_push (TV_PEEPHOLE2
);
3392 open_dump_file (DFI_peephole2
, decl
);
3394 peephole2_optimize (rtl_dump_file
);
3396 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3397 timevar_pop (TV_PEEPHOLE2
);
3401 if (optimize
> 0 && (flag_rename_registers
|| flag_cprop_registers
))
3403 timevar_push (TV_RENAME_REGISTERS
);
3404 open_dump_file (DFI_rnreg
, decl
);
3406 if (flag_rename_registers
)
3407 regrename_optimize ();
3408 if (flag_cprop_registers
)
3409 copyprop_hardreg_forward ();
3411 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3412 timevar_pop (TV_RENAME_REGISTERS
);
3415 if (flag_if_conversion2
)
3417 timevar_push (TV_IFCVT2
);
3418 open_dump_file (DFI_ce2
, decl
);
3422 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3423 timevar_pop (TV_IFCVT2
);
3427 split_all_insns (1);
3430 #ifdef INSN_SCHEDULING
3431 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3433 timevar_push (TV_SCHED2
);
3434 open_dump_file (DFI_sched2
, decl
);
3436 /* Do control and data sched analysis again,
3437 and write some more of the results to dump file. */
3439 split_all_insns (1);
3441 schedule_insns (rtl_dump_file
);
3443 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3444 timevar_pop (TV_SCHED2
);
3450 #ifdef LEAF_REGISTERS
3451 current_function_uses_only_leaf_regs
3452 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3456 timevar_push (TV_REG_STACK
);
3457 open_dump_file (DFI_stack
, decl
);
3459 reg_to_stack (insns
, rtl_dump_file
);
3461 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3462 timevar_pop (TV_REG_STACK
);
3468 timevar_push (TV_REORDER_BLOCKS
);
3469 open_dump_file (DFI_bbro
, decl
);
3471 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3472 splitting possibly introduced more crossjumping oppurtuntities.
3473 Except that we can't actually run crossjumping without running
3474 another DCE pass, which we can't do after reg-stack. */
3475 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3476 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3477 if (flag_reorder_blocks
)
3479 reorder_basic_blocks ();
3480 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3483 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3484 timevar_pop (TV_REORDER_BLOCKS
);
3486 compute_alignments ();
3488 /* CFG is no longer maintained up-to-date. */
3489 free_bb_for_insn ();
3491 /* If a machine dependent reorganization is needed, call it. */
3492 #ifdef MACHINE_DEPENDENT_REORG
3493 timevar_push (TV_MACH_DEP
);
3494 open_dump_file (DFI_mach
, decl
);
3496 MACHINE_DEPENDENT_REORG (insns
);
3498 close_dump_file (DFI_mach
, print_rtl
, insns
);
3499 timevar_pop (TV_MACH_DEP
);
3504 purge_line_number_notes (insns
);
3505 cleanup_barriers ();
3507 /* If a scheduling pass for delayed branches is to be done,
3508 call the scheduling code. */
3511 if (optimize
> 0 && flag_delayed_branch
)
3513 timevar_push (TV_DBR_SCHED
);
3514 open_dump_file (DFI_dbr
, decl
);
3516 dbr_schedule (insns
, rtl_dump_file
);
3518 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3519 timevar_pop (TV_DBR_SCHED
);
3525 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3526 timevar_push (TV_SHORTEN_BRANCH
);
3527 split_all_insns_noflow ();
3528 timevar_pop (TV_SHORTEN_BRANCH
);
3531 convert_to_eh_region_ranges ();
3533 /* Shorten branches. */
3534 timevar_push (TV_SHORTEN_BRANCH
);
3535 shorten_branches (get_insns ());
3536 timevar_pop (TV_SHORTEN_BRANCH
);
3538 set_nothrow_function_flags ();
3539 if (current_function_nothrow
)
3540 /* Now we know that this can't throw; set the flag for the benefit
3541 of other functions later in this translation unit. */
3542 TREE_NOTHROW (current_function_decl
) = 1;
3544 /* Now turn the rtl into assembler code. */
3546 timevar_push (TV_FINAL
);
3551 /* Get the function's name, as described by its RTL. This may be
3552 different from the DECL_NAME name used in the source file. */
3554 x
= DECL_RTL (decl
);
3555 if (GET_CODE (x
) != MEM
)
3558 if (GET_CODE (x
) != SYMBOL_REF
)
3560 fnname
= XSTR (x
, 0);
3562 assemble_start_function (decl
, fnname
);
3563 final_start_function (insns
, asm_out_file
, optimize
);
3564 final (insns
, asm_out_file
, optimize
, 0);
3565 final_end_function ();
3567 #ifdef IA64_UNWIND_INFO
3568 /* ??? The IA-64 ".handlerdata" directive must be issued before
3569 the ".endp" directive that closes the procedure descriptor. */
3570 output_function_exception_table ();
3573 assemble_end_function (decl
, fnname
);
3575 #ifndef IA64_UNWIND_INFO
3576 /* Otherwise, it feels unclean to switch sections in the middle. */
3577 output_function_exception_table ();
3581 fflush (asm_out_file
);
3583 /* Release all memory allocated by flow. */
3584 free_basic_block_vars (0);
3586 /* Release all memory held by regsets now. */
3587 regset_release_memory ();
3589 timevar_pop (TV_FINAL
);
3593 /* Write DBX symbols if requested. */
3595 /* Note that for those inline functions where we don't initially
3596 know for certain that we will be generating an out-of-line copy,
3597 the first invocation of this routine (rest_of_compilation) will
3598 skip over this code by doing a `goto exit_rest_of_compilation;'.
3599 Later on, finish_compilation will call rest_of_compilation again
3600 for those inline functions that need to have out-of-line copies
3601 generated. During that call, we *will* be routed past here. */
3603 timevar_push (TV_SYMOUT
);
3604 (*debug_hooks
->function_decl
) (decl
);
3605 timevar_pop (TV_SYMOUT
);
3607 exit_rest_of_compilation
:
3609 /* In case the function was not output,
3610 don't leave any temporary anonymous types
3611 queued up for sdb output. */
3612 #ifdef SDB_DEBUGGING_INFO
3613 if (write_symbols
== SDB_DEBUG
)
3614 sdbout_types (NULL_TREE
);
3617 reload_completed
= 0;
3618 flow2_completed
= 0;
3621 timevar_push (TV_FINAL
);
3623 /* Clear out the insn_length contents now that they are no
3625 init_insn_lengths ();
3627 /* Show no temporary slots allocated. */
3630 free_basic_block_vars (0);
3631 free_bb_for_insn ();
3633 timevar_pop (TV_FINAL
);
3635 /* Make sure volatile mem refs aren't considered valid operands for
3636 arithmetic insns. We must call this here if this is a nested inline
3637 function, since the above code leaves us in the init_recog state
3638 (from final.c), and the function context push/pop code does not
3639 save/restore volatile_ok.
3641 ??? Maybe it isn't necessary for expand_start_function to call this
3642 anymore if we do it here? */
3644 init_recog_no_volatile ();
3646 /* We're done with this function. Free up memory if we can. */
3647 free_after_parsing (cfun
);
3648 if (! DECL_DEFER_OUTPUT (decl
))
3650 free_after_compilation (cfun
);
3652 /* Clear integrate.c's pointer to the cfun structure we just
3654 DECL_SAVED_INSNS (decl
) = 0;
3660 timevar_pop (TV_REST_OF_COMPILATION
);
3670 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3671 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3672 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3673 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3674 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3675 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"));
3676 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3678 for (i
= ARRAY_SIZE (f_options
); i
--;)
3680 const char *description
= f_options
[i
].description
;
3682 if (description
!= NULL
&& *description
!= 0)
3683 printf (" -f%-21s %s\n",
3684 f_options
[i
].string
, _(description
));
3687 printf (_(" -O[number] Set optimization level to [number]\n"));
3688 printf (_(" -Os Optimize for space rather than speed\n"));
3689 for (i
= LAST_PARAM
; i
--;)
3691 const char *description
= compiler_params
[i
].help
;
3692 const int length
= 21 - strlen (compiler_params
[i
].option
);
3694 if (description
!= NULL
&& *description
!= 0)
3695 printf (" --param %s=<value>%.*s%s\n",
3696 compiler_params
[i
].option
,
3697 length
> 0 ? length
: 1, " ",
3700 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3701 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3702 printf (_(" -w Suppress warnings\n"));
3703 printf (_(" -W Enable extra warnings\n"));
3705 for (i
= ARRAY_SIZE (W_options
); i
--;)
3707 const char *description
= W_options
[i
].description
;
3709 if (description
!= NULL
&& *description
!= 0)
3710 printf (" -W%-21s %s\n",
3711 W_options
[i
].string
, _(description
));
3714 printf (_(" -Wunused Enable unused warnings\n"));
3715 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3716 printf (_(" -p Enable function profiling\n"));
3717 printf (_(" -o <file> Place output into <file> \n"));
3719 -G <number> Put global and static data smaller than <number>\n\
3720 bytes into a special section (on some targets)\n"));
3722 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3724 if (debug_args
[i
].description
!= NULL
)
3725 printf (" -g%-21s %s\n",
3726 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3729 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3730 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3731 printf (_(" -version Display the compiler's version\n"));
3732 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3733 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3734 #if defined INSN_SCHEDULING
3735 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3737 printf (_(" --help Display this information\n"));
3742 /* Display descriptions of language specific options.
3743 If there is no description, note that there is an undocumented option.
3744 If the description is empty, do not display anything. (This allows
3745 options to be deliberately undocumented, for whatever reason).
3746 If the option string is missing, then this is a marker, indicating
3747 that the description string is in fact the name of a language, whose
3748 language specific options are to follow. */
3750 if (ARRAY_SIZE (documented_lang_options
) > 1)
3752 printf (_("\nLanguage specific options:\n"));
3754 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3756 const char *description
= documented_lang_options
[i
].description
;
3757 const char *option
= documented_lang_options
[i
].option
;
3759 if (description
== NULL
)
3764 printf (_(" %-23.23s [undocumented]\n"), option
);
3766 else if (*description
== 0)
3768 else if (option
== NULL
)
3772 (_("\nThere are undocumented %s specific options as well.\n"),
3776 printf (_("\n Options for %s:\n"), description
);
3781 printf (" %-23.23s %s\n", option
, _(description
));
3786 printf (_("\nThere are undocumented %s specific options as well.\n"),
3789 display_target_options ();
3793 display_target_options ()
3796 static bool displayed
= false;
3798 /* Avoid double printing for --help --target-help. */
3803 if (ARRAY_SIZE (target_switches
) > 1
3804 #ifdef TARGET_OPTIONS
3805 || ARRAY_SIZE (target_options
) > 1
3813 printf (_("\nTarget specific options:\n"));
3815 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3817 const char *option
= target_switches
[i
].name
;
3818 const char *description
= target_switches
[i
].description
;
3820 if (option
== NULL
|| *option
== 0)
3822 else if (description
== NULL
)
3827 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3829 else if (*description
!= 0)
3830 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3833 #ifdef TARGET_OPTIONS
3834 for (i
= ARRAY_SIZE (target_options
); i
--;)
3836 const char *option
= target_options
[i
].prefix
;
3837 const char *description
= target_options
[i
].description
;
3839 if (option
== NULL
|| *option
== 0)
3841 else if (description
== NULL
)
3846 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3848 else if (*description
!= 0)
3849 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3855 printf (_("\nThere are undocumented target specific options as well.\n"));
3857 printf (_(" They exist, but they are not documented.\n"));
3862 /* Parse a -d... command line switch. */
3865 decode_d_option (arg
)
3874 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3875 dump_file
[i
].enabled
= 1;
3881 flag_print_asm_name
= 1;
3884 flag_dump_rtl_in_asm
= 1;
3885 flag_print_asm_name
= 1;
3888 graph_dump_format
= vcg
;
3891 rtl_dump_and_exit
= 1;
3896 case 'D': /* These are handled by the preprocessor. */
3902 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3903 if (c
== dump_file
[i
].debug_switch
)
3905 dump_file
[i
].enabled
= 1;
3910 warning ("unrecognized gcc debugging option: %c", c
);
3915 /* Parse a -f... command line switch. ARG is the value after the -f.
3916 It is safe to access 'ARG - 2' to generate the full switch name.
3917 Return the number of strings consumed. */
3920 decode_f_option (arg
)
3924 const char *option_value
= NULL
;
3926 /* Search for the option in the table of binary f options. */
3927 for (j
= ARRAY_SIZE (f_options
); j
--;)
3929 if (!strcmp (arg
, f_options
[j
].string
))
3931 *f_options
[j
].variable
= f_options
[j
].on_value
;
3935 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3936 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3938 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3943 if (!strcmp (arg
, "fast-math"))
3944 set_fast_math_flags (1);
3945 else if (!strcmp (arg
, "no-fast-math"))
3946 set_fast_math_flags (0);
3947 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3948 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3951 read_integral_parameter (option_value
, arg
- 2,
3953 set_param_value ("max-inline-insns", val
);
3955 else if ((option_value
= skip_leading_substring (arg
, "tls-model=")))
3957 if (strcmp (option_value
, "global-dynamic") == 0)
3958 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
3959 else if (strcmp (option_value
, "local-dynamic") == 0)
3960 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
3961 else if (strcmp (option_value
, "initial-exec") == 0)
3962 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
3963 else if (strcmp (option_value
, "local-exec") == 0)
3964 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
3966 warning ("`%s': unknown tls-model option", arg
- 2);
3968 #ifdef INSN_SCHEDULING
3969 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3970 fix_sched_param ("verbose", option_value
);
3972 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3973 fix_register (option_value
, 1, 1);
3974 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3975 fix_register (option_value
, 0, 1);
3976 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3977 fix_register (option_value
, 0, 0);
3978 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3979 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3980 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3982 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3983 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3984 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3985 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3987 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3988 else if ((option_value
3989 = skip_leading_substring (arg
, "stack-limit-register=")))
3991 int reg
= decode_reg_name (option_value
);
3993 error ("unrecognized register name `%s'", option_value
);
3995 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3997 else if ((option_value
3998 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4001 nm
= ggc_strdup (option_value
);
4002 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4004 else if ((option_value
4005 = skip_leading_substring (arg
, "message-length=")))
4006 output_set_maximum_length
4007 (&global_dc
->buffer
, read_integral_parameter
4008 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4009 else if ((option_value
4010 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4012 if (!strcmp (option_value
, "once"))
4013 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4014 else if (!strcmp (option_value
, "every-line"))
4015 diagnostic_prefixing_rule (global_dc
)
4016 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4018 error ("unrecognized option `%s'", arg
- 2);
4020 else if (!strcmp (arg
, "no-stack-limit"))
4021 stack_limit_rtx
= NULL_RTX
;
4022 else if (!strcmp (arg
, "preprocessed"))
4023 /* Recognize this switch but do nothing. This prevents warnings
4024 about an unrecognized switch if cpplib has not been linked in. */
4032 /* Parse a -W... command line switch. ARG is the value after the -W.
4033 It is safe to access 'ARG - 2' to generate the full switch name.
4034 Return the number of strings consumed. */
4037 decode_W_option (arg
)
4040 const char *option_value
= NULL
;
4043 /* Search for the option in the table of binary W options. */
4045 for (j
= ARRAY_SIZE (W_options
); j
--;)
4047 if (!strcmp (arg
, W_options
[j
].string
))
4049 *W_options
[j
].variable
= W_options
[j
].on_value
;
4053 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4054 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4056 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4061 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4062 warning ("-Wid-clash-LEN is no longer supported");
4063 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4065 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4067 warn_larger_than
= larger_than_size
!= -1;
4069 else if (!strcmp (arg
, "unused"))
4073 else if (!strcmp (arg
, "no-unused"))
4083 /* Parse a -g... command line switch. ARG is the value after the -g.
4084 It is safe to access 'ARG - 2' to generate the full switch name.
4085 Return the number of strings consumed. */
4088 decode_g_option (arg
)
4091 static unsigned level
= 0;
4092 /* A lot of code assumes write_symbols == NO_DEBUG if the
4093 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4094 of what debugging type has been selected). This records the
4095 selected type. It is an error to specify more than one
4097 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4098 /* Non-zero if debugging format has been explicitly set.
4099 -g and -ggdb don't explicitly set the debugging format so
4100 -gdwarf -g3 is equivalent to -gdwarf3. */
4101 static int type_explicitly_set_p
= 0;
4102 /* Indexed by enum debug_info_type. */
4103 static const char *const debug_type_names
[] =
4105 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4108 /* The maximum admissible debug level value. */
4109 static const unsigned max_debug_level
= 3;
4111 /* Look up ARG in the table. */
4112 for (da
= debug_args
; da
->arg
; da
++)
4114 const int da_len
= strlen (da
->arg
);
4116 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4118 enum debug_info_type type
= da
->debug_type
;
4119 const char *p
= arg
+ da_len
;
4121 if (*p
&& ! ISDIGIT (*p
))
4124 /* A debug flag without a level defaults to level 2.
4125 Note we do not want to call read_integral_parameter
4126 for that case since it will call atoi which
4129 ??? We may want to generalize the interface to
4130 read_integral_parameter to better handle this case
4131 if this case shows up often. */
4133 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4135 level
= (level
== 0) ? 2 : level
;
4137 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4139 error ("use -gdwarf -g%d for DWARF v1, level %d",
4142 error ("use -gdwarf-2 for DWARF v2");
4145 if (level
> max_debug_level
)
4148 ignoring option `%s' due to invalid debug level specification",
4150 level
= debug_info_level
;
4153 if (type
== NO_DEBUG
)
4155 type
= PREFERRED_DEBUGGING_TYPE
;
4157 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4159 #ifdef DWARF2_DEBUGGING_INFO
4160 type
= DWARF2_DEBUG
;
4162 #ifdef DBX_DEBUGGING_INFO
4169 if (type
== NO_DEBUG
)
4170 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4172 /* Does it conflict with an already selected type? */
4173 if (type_explicitly_set_p
4174 /* -g/-ggdb don't conflict with anything. */
4175 && da
->debug_type
!= NO_DEBUG
4176 && type
!= selected_debug_type
)
4177 warning ("`%s' ignored, conflicts with `-g%s'",
4178 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4181 /* If the format has already been set, -g/-ggdb
4182 only change the debug level. */
4183 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4184 /* Don't change debugging type. */
4188 selected_debug_type
= type
;
4189 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4192 write_symbols
= (level
== 0
4194 : selected_debug_type
);
4195 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4196 debug_info_level
= (enum debug_info_level
) level
;
4209 /* Decode the first argument in the argv as a language-independent option.
4210 Return the number of strings consumed. */
4213 independent_decode_option (argc
, argv
)
4217 char *arg
= argv
[0];
4219 if (arg
[0] != '-' || arg
[1] == 0)
4231 if (!strcmp (arg
, "-help"))
4234 exit_after_options
= 1;
4237 if (!strcmp (arg
, "-target-help"))
4239 display_target_options ();
4240 exit_after_options
= 1;
4243 if (!strcmp (arg
, "-version"))
4245 print_version (stderr
, "");
4246 exit_after_options
= 1;
4249 /* Handle '--param <name>=<value>'. */
4250 if (strcmp (arg
, "-param") == 0)
4256 error ("-param option missing argument");
4260 /* Get the '<name>=<value>' parameter. */
4262 /* Look for the `='. */
4263 equal
= strchr (arg
, '=');
4265 error ("invalid --param option: %s", arg
);
4270 /* Zero out the `=' sign so that we get two separate strings. */
4272 /* Figure out what value is specified. */
4273 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4274 if (val
!= INVALID_PARAM_VAL
)
4275 set_param_value (arg
, val
);
4277 error ("invalid parameter value `%s'", equal
+ 1);
4292 /* Already been treated in main (). Do nothing. */
4296 set_target_switch (arg
+ 1);
4300 return decode_f_option (arg
+ 1);
4303 return decode_g_option (arg
+ 1);
4306 if (!strcmp (arg
, "dumpbase"))
4312 dump_base_name
= argv
[1];
4317 decode_d_option (arg
+ 1);
4321 if (!strcmp (arg
, "pedantic"))
4323 else if (!strcmp (arg
, "pedantic-errors"))
4324 flag_pedantic_errors
= pedantic
= 1;
4325 else if (arg
[1] == 0)
4332 if (!strcmp (arg
, "quiet"))
4339 if (!strcmp (arg
, "version"))
4347 inhibit_warnings
= 1;
4356 /* We save the value of warn_uninitialized, since if they put
4357 -Wuninitialized on the command line, we need to generate a
4358 warning about not using it without also specifying -O. */
4359 if (warn_uninitialized
!= 1)
4360 warn_uninitialized
= 2;
4363 return decode_W_option (arg
+ 1);
4367 if (!strncmp (arg
, "aux-info", 8))
4374 aux_info_file_name
= argv
[1];
4375 flag_gen_aux_info
= 1;
4378 else if (arg
[8] == '=')
4380 aux_info_file_name
= arg
+ 9;
4381 flag_gen_aux_info
= 1;
4386 else if (!strcmp (arg
, "auxbase"))
4392 aux_base_name
= argv
[1];
4396 else if (!strcmp (arg
, "auxbase-strip"))
4403 strip_off_ending (argv
[1], strlen (argv
[1]));
4405 aux_base_name
= argv
[1];
4420 asm_file_name
= argv
[1];
4435 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4440 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4444 if (g_switch_val
== -1)
4448 g_switch_set
= TRUE
;
4449 g_switch_value
= g_switch_val
;
4459 /* Decode -m switches. */
4460 /* Decode the switch -mNAME. */
4463 set_target_switch (name
)
4467 int valid_target_option
= 0;
4469 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4470 if (!strcmp (target_switches
[j
].name
, name
))
4472 if (target_switches
[j
].value
< 0)
4473 target_flags
&= ~-target_switches
[j
].value
;
4475 target_flags
|= target_switches
[j
].value
;
4478 if (target_switches
[j
].value
< 0)
4479 target_flags_explicit
|= -target_switches
[j
].value
;
4481 target_flags_explicit
|= target_switches
[j
].value
;
4483 valid_target_option
= 1;
4486 #ifdef TARGET_OPTIONS
4487 if (!valid_target_option
)
4488 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4490 int len
= strlen (target_options
[j
].prefix
);
4491 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4493 *target_options
[j
].variable
= name
+ len
;
4494 valid_target_option
= 1;
4499 if (!valid_target_option
)
4500 error ("invalid option `%s'", name
);
4503 /* Print version information to FILE.
4504 Each line begins with INDENT (for the case where FILE is the
4505 assembler output file). */
4508 print_version (file
, indent
)
4513 #define __VERSION__ "[?]"
4517 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4519 "%s%s%s version %s (%s) compiled by CC.\n"
4521 , indent
, *indent
!= 0 ? " " : "",
4522 lang_hooks
.name
, version_string
, TARGET_NAME
,
4523 indent
, __VERSION__
);
4526 /* Print an option value and return the adjusted position in the line.
4527 ??? We don't handle error returns from fprintf (disk full); presumably
4528 other code will catch a disk full though. */
4531 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4534 const char *indent
, *sep
, *term
, *type
, *name
;
4536 /* The ultrix fprintf returns 0 on success, so compute the result we want
4537 here since we need it for the following test. */
4538 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4543 fprintf (file
, "%s", term
);
4548 fprintf (file
, "%s", indent
);
4549 pos
= strlen (indent
);
4551 fprintf (file
, "%s%s%s", sep
, type
, name
);
4556 /* Print active target switches to FILE.
4557 POS is the current cursor position and MAX is the size of a "line".
4558 Each line begins with INDENT and ends with TERM.
4559 Each switch is separated from the next by SEP. */
4562 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4565 const char *indent
, *sep
, *term
;
4570 /* Print the options as passed. */
4572 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4573 _("options passed: "), "");
4575 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4579 if (strcmp (*p
, "-o") == 0)
4585 if (strcmp (*p
, "-quiet") == 0)
4587 if (strcmp (*p
, "-version") == 0)
4592 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4595 fprintf (file
, "%s", term
);
4597 /* Print the -f and -m options that have been enabled.
4598 We don't handle language specific options but printing argv
4601 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4602 _("options enabled: "), "");
4604 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4605 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4606 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4607 "-f", f_options
[j
].string
);
4609 /* Print target specific options. */
4611 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4612 if (target_switches
[j
].name
[0] != '\0'
4613 && target_switches
[j
].value
> 0
4614 && ((target_switches
[j
].value
& target_flags
)
4615 == target_switches
[j
].value
))
4617 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4618 "-m", target_switches
[j
].name
);
4621 #ifdef TARGET_OPTIONS
4622 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4623 if (*target_options
[j
].variable
!= NULL
)
4626 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4627 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4628 prefix
, *target_options
[j
].variable
);
4632 fprintf (file
, "%s", term
);
4635 /* Open assembly code output file. Do this even if -fsyntax-only is
4636 on, because then the driver will have provided the name of a
4637 temporary file or bit bucket for us. NAME is the file specified on
4638 the command line, possibly NULL. */
4640 init_asm_output (name
)
4643 if (name
== NULL
&& asm_file_name
== 0)
4644 asm_out_file
= stdout
;
4647 if (asm_file_name
== 0)
4649 int len
= strlen (dump_base_name
);
4650 char *dumpname
= (char *) xmalloc (len
+ 6);
4651 memcpy (dumpname
, dump_base_name
, len
+ 1);
4652 strip_off_ending (dumpname
, len
);
4653 strcat (dumpname
, ".s");
4654 asm_file_name
= dumpname
;
4656 if (!strcmp (asm_file_name
, "-"))
4657 asm_out_file
= stdout
;
4659 asm_out_file
= fopen (asm_file_name
, "w");
4660 if (asm_out_file
== 0)
4661 fatal_io_error ("can't open %s for writing", asm_file_name
);
4664 #ifdef IO_BUFFER_SIZE
4665 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4666 _IOFBF
, IO_BUFFER_SIZE
);
4669 if (!flag_syntax_only
)
4671 #ifdef ASM_FILE_START
4672 ASM_FILE_START (asm_out_file
);
4675 #ifdef ASM_COMMENT_START
4676 if (flag_verbose_asm
)
4678 /* Print the list of options in effect. */
4679 print_version (asm_out_file
, ASM_COMMENT_START
);
4680 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4681 ASM_COMMENT_START
, " ", "\n");
4682 /* Add a blank line here so it appears in assembler output but not
4684 fprintf (asm_out_file
, "\n");
4690 /* Initialization of the front end environment, before command line
4691 options are parsed. Signal handlers, internationalization etc.
4692 ARGV0 is main's argv[0]. */
4694 general_init (argv0
)
4699 p
= argv0
+ strlen (argv0
);
4700 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4704 xmalloc_set_program_name (progname
);
4708 gcc_init_libintl ();
4710 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4712 signal (SIGSEGV
, crash_signal
);
4715 signal (SIGILL
, crash_signal
);
4718 signal (SIGBUS
, crash_signal
);
4721 signal (SIGABRT
, crash_signal
);
4723 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4724 signal (SIGIOT
, crash_signal
);
4727 signal (SIGFPE
, crash_signal
);
4730 /* Initialize the diagnostics reporting machinery, so option parsing
4731 can give warnings and errors. */
4732 diagnostic_initialize (global_dc
);
4734 /* Initialize the garbage-collector, string pools and tree type hash
4741 /* Parse command line options and set default flag values, called
4742 after language-independent option-independent initialization. Do
4743 minimal options processing. Outputting diagnostics is OK, but GC
4744 and identifier hashtables etc. are not initialized yet.
4746 Return nonzero to suppress compiler back end initialization. */
4748 parse_options_and_default_flags (argc
, argv
)
4754 /* Save in case md file wants to emit args as a comment. */
4758 /* Initialize register usage now so switches may override. */
4761 /* Register the language-independent parameters. */
4762 add_params (lang_independent_params
, LAST_PARAM
);
4764 /* Perform language-specific options initialization. */
4765 (*lang_hooks
.init_options
) ();
4767 /* Scan to see what optimization level has been specified. That will
4768 determine the default value of many flags. */
4769 for (i
= 1; i
< argc
; i
++)
4771 if (!strcmp (argv
[i
], "-O"))
4776 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4778 /* Handle -Os, -O2, -O3, -O69, ... */
4779 char *p
= &argv
[i
][2];
4781 if ((p
[0] == 's') && (p
[1] == 0))
4785 /* Optimizing for size forces optimize to be 2. */
4790 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4791 if (optimize_val
!= -1)
4793 optimize
= optimize_val
;
4802 flag_merge_constants
= 0;
4808 flag_thread_jumps
= 1;
4810 flag_delayed_branch
= 1;
4812 #ifdef CAN_DEBUG_WITHOUT_FP
4813 flag_omit_frame_pointer
= 1;
4815 flag_guess_branch_prob
= 1;
4816 flag_cprop_registers
= 1;
4817 flag_loop_optimize
= 1;
4818 flag_crossjumping
= 1;
4819 flag_if_conversion
= 1;
4820 flag_if_conversion2
= 1;
4825 flag_optimize_sibling_calls
= 1;
4826 flag_cse_follow_jumps
= 1;
4827 flag_cse_skip_blocks
= 1;
4829 flag_expensive_optimizations
= 1;
4830 flag_strength_reduce
= 1;
4831 flag_rerun_cse_after_loop
= 1;
4832 flag_rerun_loop_opt
= 1;
4833 flag_caller_saves
= 1;
4836 #ifdef INSN_SCHEDULING
4837 flag_schedule_insns
= 1;
4838 flag_schedule_insns_after_reload
= 1;
4841 flag_strict_aliasing
= 1;
4842 flag_delete_null_pointer_checks
= 1;
4843 flag_reorder_blocks
= 1;
4844 flag_reorder_functions
= 1;
4849 flag_inline_functions
= 1;
4850 flag_rename_registers
= 1;
4853 if (optimize
< 2 || optimize_size
)
4858 align_functions
= 1;
4860 /* Don't reorder blocks when optimizing for size because extra
4861 jump insns may be created; also barrier may create extra padding.
4863 More correctly we should have a block reordering mode that tried
4864 to minimize the combined size of all the jumps. This would more
4865 or less automatically remove extra jumps, but would also try to
4866 use more short jumps instead of long jumps. */
4867 flag_reorder_blocks
= 0;
4870 /* Initialize whether `char' is signed. */
4871 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4872 #ifdef DEFAULT_SHORT_ENUMS
4873 /* Initialize how much space enums occupy, by default. */
4874 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4877 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4880 set_target_switch ("");
4882 /* Unwind tables are always present in an ABI-conformant IA-64
4883 object file, so the default should be ON. */
4884 #ifdef IA64_UNWIND_INFO
4885 flag_unwind_tables
= IA64_UNWIND_INFO
;
4888 #ifdef OPTIMIZATION_OPTIONS
4889 /* Allow default optimizations to be specified on a per-machine basis. */
4890 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4893 /* Perform normal command line switch decoding. */
4894 for (i
= 1; i
< argc
;)
4897 int indep_processed
;
4899 /* Give the language a chance to decode the option for itself. */
4900 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4902 if (lang_processed
>= 0)
4903 /* Now see if the option also has a language independent meaning.
4904 Some options are both language specific and language independent,
4906 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4909 lang_processed
= -lang_processed
;
4910 indep_processed
= 0;
4913 if (lang_processed
|| indep_processed
)
4914 i
+= MAX (lang_processed
, indep_processed
);
4917 const char *option
= NULL
;
4918 const char *lang
= NULL
;
4921 /* It is possible that the command line switch is not valid for the
4922 current language, but it is valid for another language. In order
4923 to be compatible with previous versions of the compiler (which
4924 did not issue an error message in this case) we check for this
4925 possibility here. If we do find a match, then if extra_warnings
4926 is set we generate a warning message, otherwise we will just
4927 ignore the option. */
4928 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4930 option
= documented_lang_options
[j
].option
;
4933 lang
= documented_lang_options
[j
].description
;
4934 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4938 if (j
!= ARRAY_SIZE (documented_lang_options
))
4942 warning ("ignoring command line option '%s'", argv
[i
]);
4945 ("(it is valid for %s but not the selected language)",
4949 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4950 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4952 error ("unrecognized option `%s'", argv
[i
]);
4958 if (flag_no_inline
== 2)
4961 flag_really_no_inline
= flag_no_inline
;
4963 /* Set flag_no_inline before the post_options () hook. The C front
4964 ends use it to determine tree inlining defaults. FIXME: such
4965 code should be lang-independent when all front ends use tree
4966 inlining, in which case it, and this condition, should be moved
4967 to the top of process_options() instead. */
4970 /* Inlining does not work if not optimizing,
4971 so force it not to be done. */
4975 /* The c_decode_option function and decode_option hook set
4976 this to `2' if -Wall is used, so we can avoid giving out
4977 lots of errors for people who don't realize what -Wall does. */
4978 if (warn_uninitialized
== 1)
4979 warning ("-Wuninitialized is not supported without -O");
4982 if (flag_really_no_inline
== 2)
4983 flag_really_no_inline
= flag_no_inline
;
4986 /* Process the options that have been parsed. */
4990 #ifdef OVERRIDE_OPTIONS
4991 /* Some machines may reject certain combinations of options. */
4995 /* Set up the align_*_log variables, defaulting them to 1 if they
4996 were still unset. */
4997 if (align_loops
<= 0) align_loops
= 1;
4998 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4999 align_loops_max_skip
= align_loops
- 1;
5000 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
5001 if (align_jumps
<= 0) align_jumps
= 1;
5002 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
5003 align_jumps_max_skip
= align_jumps
- 1;
5004 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
5005 if (align_labels
<= 0) align_labels
= 1;
5006 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
5007 if (align_labels_max_skip
> align_labels
|| !align_labels
)
5008 align_labels_max_skip
= align_labels
- 1;
5009 if (align_functions
<= 0) align_functions
= 1;
5010 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
5012 /* Unrolling all loops implies that standard loop unrolling must also
5014 if (flag_unroll_all_loops
)
5015 flag_unroll_loops
= 1;
5016 /* Loop unrolling requires that strength_reduction be on also. Silently
5017 turn on strength reduction here if it isn't already on. Also, the loop
5018 unrolling code assumes that cse will be run after loop, so that must
5019 be turned on also. */
5020 if (flag_unroll_loops
)
5022 flag_strength_reduce
= 1;
5023 flag_rerun_cse_after_loop
= 1;
5026 if (flag_non_call_exceptions
)
5027 flag_asynchronous_unwind_tables
= 1;
5028 if (flag_asynchronous_unwind_tables
)
5029 flag_unwind_tables
= 1;
5031 /* Warn about options that are not supported on this machine. */
5032 #ifndef INSN_SCHEDULING
5033 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
5034 warning ("instruction scheduling not supported on this target machine");
5037 if (flag_delayed_branch
)
5038 warning ("this target machine does not have delayed branches");
5041 user_label_prefix
= USER_LABEL_PREFIX
;
5042 if (flag_leading_underscore
!= -1)
5044 /* If the default prefix is more complicated than "" or "_",
5045 issue a warning and ignore this option. */
5046 if (user_label_prefix
[0] == 0 ||
5047 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
5049 user_label_prefix
= flag_leading_underscore
? "_" : "";
5052 warning ("-f%sleading-underscore not supported on this target machine",
5053 flag_leading_underscore
? "" : "no-");
5056 /* If we are in verbose mode, write out the version and maybe all the
5057 option flags in use. */
5060 print_version (stderr
, "");
5062 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
5068 if (flag_syntax_only
)
5070 write_symbols
= NO_DEBUG
;
5074 /* Now we know write_symbols, set up the debug hooks based on it.
5075 By default we do nothing for debug output. */
5076 #if defined(DBX_DEBUGGING_INFO)
5077 if (write_symbols
== DBX_DEBUG
)
5078 debug_hooks
= &dbx_debug_hooks
;
5080 #if defined(XCOFF_DEBUGGING_INFO)
5081 if (write_symbols
== XCOFF_DEBUG
)
5082 debug_hooks
= &xcoff_debug_hooks
;
5084 #ifdef SDB_DEBUGGING_INFO
5085 if (write_symbols
== SDB_DEBUG
)
5086 debug_hooks
= &sdb_debug_hooks
;
5088 #ifdef DWARF_DEBUGGING_INFO
5089 if (write_symbols
== DWARF_DEBUG
)
5090 debug_hooks
= &dwarf_debug_hooks
;
5092 #ifdef DWARF2_DEBUGGING_INFO
5093 if (write_symbols
== DWARF2_DEBUG
)
5094 debug_hooks
= &dwarf2_debug_hooks
;
5096 #ifdef VMS_DEBUGGING_INFO
5097 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
5098 debug_hooks
= &vmsdbg_debug_hooks
;
5101 /* If auxiliary info generation is desired, open the output file.
5102 This goes in the same directory as the source file--unlike
5103 all the other output files. */
5104 if (flag_gen_aux_info
)
5106 aux_info_file
= fopen (aux_info_file_name
, "w");
5107 if (aux_info_file
== 0)
5108 fatal_io_error ("can't open %s", aux_info_file_name
);
5111 if (! targetm
.have_named_sections
)
5113 if (flag_function_sections
)
5115 warning ("-ffunction-sections not supported for this target");
5116 flag_function_sections
= 0;
5118 if (flag_data_sections
)
5120 warning ("-fdata-sections not supported for this target");
5121 flag_data_sections
= 0;
5125 if (flag_function_sections
&& profile_flag
)
5127 warning ("-ffunction-sections disabled; it makes profiling impossible");
5128 flag_function_sections
= 0;
5131 #ifndef HAVE_prefetch
5132 if (flag_prefetch_loop_arrays
)
5134 warning ("-fprefetch-loop-arrays not supported for this target");
5135 flag_prefetch_loop_arrays
= 0;
5138 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
5140 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5141 flag_prefetch_loop_arrays
= 0;
5145 /* This combination of options isn't handled for i386 targets and doesn't
5146 make much sense anyway, so don't allow it. */
5147 if (flag_prefetch_loop_arrays
&& optimize_size
)
5149 warning ("-fprefetch-loop-arrays is not supported with -Os");
5150 flag_prefetch_loop_arrays
= 0;
5153 #ifndef OBJECT_FORMAT_ELF
5154 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5155 warning ("-ffunction-sections may affect debugging on some targets");
5158 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5159 if (flag_signaling_nans
)
5160 flag_trapping_math
= 1;
5163 /* Initialize the compiler back end. */
5167 /* init_emit_once uses reg_raw_mode and therefore must be called
5168 after init_regs which initialized reg_raw_mode. */
5170 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5171 || debug_info_level
== DINFO_LEVEL_VERBOSE
5172 #ifdef VMS_DEBUGGING_INFO
5173 /* Enable line number info for traceback */
5174 || debug_info_level
> DINFO_LEVEL_NONE
5176 || flag_test_coverage
5177 || warn_notreached
);
5178 init_fake_stack_mems ();
5182 init_function_once ();
5183 init_varasm_once ();
5185 /* The following initialization functions need to generate rtl, so
5186 provide a dummy function context for them. */
5187 init_dummy_function_start ();
5189 if (flag_caller_saves
)
5190 init_caller_save ();
5191 expand_dummy_function_end ();
5194 /* Language-dependent initialization. Returns nonzero on success. */
5196 lang_dependent_init (name
)
5199 if (dump_base_name
== 0)
5200 dump_base_name
= name
? name
: "gccdump";
5202 /* Front-end initialization. This hook can assume that GC,
5203 identifier hashes etc. are set up, but debug initialization is
5204 not done yet. This routine must return the original filename
5205 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5206 name
= (*lang_hooks
.init
) (name
);
5210 /* Is this duplication necessary? */
5211 name
= ggc_strdup (name
);
5212 main_input_filename
= input_filename
= name
;
5213 init_asm_output (name
);
5215 /* These create various _DECL nodes, so need to be called after the
5216 front end is initialized. */
5220 /* The following initialization functions need to generate rtl, so
5221 provide a dummy function context for them. */
5222 init_dummy_function_start ();
5224 expand_dummy_function_end ();
5226 /* Put an entry on the input file stack for the main input file. */
5227 push_srcloc (input_filename
, 0);
5229 /* If dbx symbol table desired, initialize writing it and output the
5230 predefined types. */
5231 timevar_push (TV_SYMOUT
);
5233 #ifdef DWARF2_UNWIND_INFO
5234 if (dwarf2out_do_frame ())
5235 dwarf2out_frame_init ();
5238 /* Now we have the correct original filename, we can initialize
5240 (*debug_hooks
->init
) (name
);
5242 timevar_pop (TV_SYMOUT
);
5247 /* Clean up: close opened files, etc. */
5252 /* Close the dump files. */
5253 if (flag_gen_aux_info
)
5255 fclose (aux_info_file
);
5257 unlink (aux_info_file_name
);
5260 /* Close non-debugging input and output files. Take special care to note
5261 whether fclose returns an error, since the pages might still be on the
5262 buffer chain while the file is open. */
5266 if (ferror (asm_out_file
) != 0)
5267 fatal_io_error ("error writing to %s", asm_file_name
);
5268 if (fclose (asm_out_file
) != 0)
5269 fatal_io_error ("error closing %s", asm_file_name
);
5272 /* Do whatever is necessary to finish printing the graphs. */
5273 if (graph_dump_format
!= no_graph
)
5277 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5278 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5283 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5284 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5285 finish_graph_dump_file (dump_base_name
, suffix
);
5292 ggc_print_statistics ();
5293 stringpool_statistics ();
5294 dump_tree_statistics ();
5297 /* Free up memory for the benefit of leak detectors. */
5300 /* Language-specific end of compilation actions. */
5301 (*lang_hooks
.finish
) ();
5304 /* Initialize the compiler, and compile the input file. */
5308 /* All command line options have been parsed; allow the front end to
5309 perform consistency checks, etc. */
5310 bool no_backend
= (*lang_hooks
.post_options
) ();
5312 /* The bulk of command line switch processing. */
5315 /* If an error has already occurred, give up. */
5323 char *name
= xstrdup (lbasename (filename
));
5325 aux_base_name
= name
;
5326 strip_off_ending (name
, strlen (name
));
5329 aux_base_name
= "gccaux";
5331 /* We cannot start timing until after options are processed since that
5332 says if we run timers or not. */
5334 timevar_start (TV_TOTAL
);
5336 /* Set up the back-end if requested. */
5340 /* Language-dependent initialization. Returns true on success. */
5341 if (lang_dependent_init (filename
))
5346 /* Stop timing and print the times. */
5347 timevar_stop (TV_TOTAL
);
5348 timevar_print (stderr
);
5351 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5352 Decode command args, then call compile_file.
5353 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5354 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5356 It is not safe to call this function more than once. */
5359 toplev_main (argc
, argv
)
5363 /* Initialization of GCC's environment, and diagnostics. */
5364 general_init (argv
[0]);
5366 /* Parse the options and do minimal processing; basically just
5367 enough to default flags appropriately. */
5368 parse_options_and_default_flags (argc
, argv
);
5370 /* Exit early if we can (e.g. -help). */
5371 if (!exit_after_options
)
5374 if (errorcount
|| sorrycount
)
5375 return (FATAL_EXIT_CODE
);
5377 return (SUCCESS_EXIT_CODE
);