2 /* Top level of GNU C compiler
3 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* This is the top level of cc1/c++.
24 It parses command args, opens files, invokes the various passes
25 in the proper order, and counts the time used by each.
26 Error messages and low-level interface to malloc also handled here. */
29 #undef FLOAT /* This is for hpux. They should change hpux. */
30 #undef FFS /* Some systems define this in param.h. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.h"
49 #include "insn-flags.h"
50 #include "hard-reg-set.h"
57 #include "basic-block.h"
64 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
72 #include "langhooks.h"
73 #include "cfglayout.h"
75 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
76 #include "dwarf2out.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
83 #ifdef SDB_DEBUGGING_INFO
87 #ifdef XCOFF_DEBUGGING_INFO
88 #include "xcoffout.h" /* Needed for external data
89 declarations for e.g. AIX 4.x. */
96 /* Carry information from ASM_DECLARE_OBJECT_NAME
97 to ASM_FINISH_DECLARE_OBJECT. */
99 extern int size_directive_output
;
100 extern tree last_assemble_variable_decl
;
102 static void general_init
PARAMS ((char *));
103 static void parse_options_and_default_flags
PARAMS ((int, char **));
104 static void do_compile
PARAMS ((void));
105 static void process_options
PARAMS ((void));
106 static void lang_independent_init
PARAMS ((void));
107 static int lang_dependent_init
PARAMS ((const char *));
108 static void init_asm_output
PARAMS ((const char *));
109 static void finalize
PARAMS ((void));
111 static void set_target_switch
PARAMS ((const char *));
113 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
114 static void compile_file
PARAMS ((void));
115 static void display_help
PARAMS ((void));
116 static void display_target_options
PARAMS ((void));
118 static void decode_d_option
PARAMS ((const char *));
119 static int decode_f_option
PARAMS ((const char *));
120 static int decode_W_option
PARAMS ((const char *));
121 static int decode_g_option
PARAMS ((const char *));
122 static unsigned int independent_decode_option
PARAMS ((int, char **));
124 static void print_version
PARAMS ((FILE *, const char *));
125 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
126 const char *, const char *,
127 const char *, const char *));
128 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
129 const char *, const char *));
131 /* Nonzero to dump debug info whilst parsing (-dy option). */
132 static int set_yydebug
;
134 /* Length of line when printing switch values. */
137 /* Name of program invoked, sans directories. */
139 const char *progname
;
141 /* Copy of arguments to toplev_main. */
145 /* Name of current original source file (what was input to cpp).
146 This comes from each #-command in the actual input. */
148 const char *input_filename
;
150 /* Name of top-level original source file (what was input to cpp).
151 This comes from the #-command at the beginning of the actual input.
152 If there isn't any there, then this is the cc1 input file name. */
154 const char *main_input_filename
;
156 /* Current line number in real source file. */
160 /* Nonzero if it is unsafe to create any new pseudo registers. */
163 /* Stack of currently pending input files. */
165 struct file_stack
*input_file_stack
;
167 /* Incremented on each change to input_file_stack. */
168 int input_file_stack_tick
;
170 /* Name to use as base of names for dump output files. */
172 const char *dump_base_name
;
174 /* Format to use to print dumpfile index value */
175 #ifndef DUMPFILE_FORMAT
176 #define DUMPFILE_FORMAT ".%02d."
179 /* Bit flags that specify the machine subtype we are compiling for.
180 Bits are tested using macros TARGET_... defined in the tm.h file
181 and set by `-m...' switches. Must be defined in rtlanal.c. */
183 extern int target_flags
;
185 /* Debug hooks - dependent upon command line options. */
187 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
189 /* Describes a dump file. */
191 struct dump_file_info
193 /* The unique extension to apply, e.g. ".jump". */
194 const char *const extension
;
196 /* The -d<c> character that enables this dump file. */
197 char const debug_switch
;
199 /* True if there is a corresponding graph dump file. */
200 char const graph_dump_p
;
202 /* True if the user selected this dump. */
205 /* True if the files have been initialized (ie truncated). */
209 /* Enumerate the extant dump files. */
250 /* Describes all the dump files. Should be kept in order of the
251 pass and in sync with dump_file_index above.
253 Remaining -d letters:
259 static struct dump_file_info dump_file
[DFI_MAX
] =
261 { "rtl", 'r', 0, 0, 0 },
262 { "sibling", 'i', 0, 0, 0 },
263 { "eh", 'h', 0, 0, 0 },
264 { "jump", 'j', 0, 0, 0 },
265 { "ssa", 'e', 1, 0, 0 },
266 { "ssaccp", 'W', 1, 0, 0 },
267 { "ssadce", 'X', 1, 0, 0 },
268 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
269 { "null", 'u', 0, 0, 0 },
270 { "cse", 's', 0, 0, 0 },
271 { "addressof", 'F', 0, 0, 0 },
272 { "gcse", 'G', 1, 0, 0 },
273 { "loop", 'L', 1, 0, 0 },
274 { "cfg", 'f', 1, 0, 0 },
275 { "bp", 'b', 1, 0, 0 },
276 { "tracer", 'T', 1, 0, 0 },
277 { "cse2", 't', 1, 0, 0 },
278 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
279 { "combine", 'c', 1, 0, 0 },
280 { "ce", 'C', 1, 0, 0 },
281 { "regmove", 'N', 1, 0, 0 },
282 { "sched", 'S', 1, 0, 0 },
283 { "lreg", 'l', 1, 0, 0 },
284 { "greg", 'g', 1, 0, 0 },
285 { "postreload", 'o', 1, 0, 0 },
286 { "flow2", 'w', 1, 0, 0 },
287 { "peephole2", 'z', 1, 0, 0 },
288 { "rnreg", 'n', 1, 0, 0 },
289 { "ce2", 'E', 1, 0, 0 },
290 { "sched2", 'R', 1, 0, 0 },
291 { "stack", 'k', 1, 0, 0 },
292 { "bbro", 'B', 1, 0, 0 },
293 { "mach", 'M', 1, 0, 0 },
294 { "dbr", 'd', 0, 0, 0 },
297 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
298 static void close_dump_file
PARAMS ((enum dump_file_index
,
299 void (*) (FILE *, rtx
), rtx
));
301 /* Other flags saying which kinds of debugging dump have been requested. */
303 int rtl_dump_and_exit
;
304 int flag_print_asm_name
;
305 static int version_flag
;
306 static char *filename
;
307 enum graph_dump_types graph_dump_format
;
309 /* Name for output file of assembly code, specified with -o. */
313 /* Value of the -G xx switch, and whether it was passed or not. */
317 /* Type(s) of debugging information we are producing (if any).
318 See flags.h for the definitions of the different possible
319 types of debugging information. */
320 enum debug_info_type write_symbols
= NO_DEBUG
;
322 /* Level of debugging information we are producing. See flags.h
323 for the definitions of the different possible levels. */
324 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
326 /* Nonzero means use GNU-only extensions in the generated symbolic
327 debugging information. */
328 /* Currently, this only has an effect when write_symbols is set to
329 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
330 int use_gnu_debug_info_extensions
= 0;
332 /* Nonzero means do optimizations. -O.
333 Particular numeric values stand for particular amounts of optimization;
334 thus, -O2 stores 2 here. However, the optimizations beyond the basic
335 ones are not controlled directly by this variable. Instead, they are
336 controlled by individual `flag_...' variables that are defaulted
337 based on this variable. */
341 /* Nonzero means optimize for size. -Os.
342 The only valid values are zero and non-zero. When optimize_size is
343 non-zero, optimize defaults to 2, but certain individual code
344 bloating optimizations are disabled. */
346 int optimize_size
= 0;
348 /* Nonzero if we should exit after parsing options. */
349 static int exit_after_options
= 0;
351 /* The FUNCTION_DECL for the function currently being compiled,
352 or 0 if between functions. */
353 tree current_function_decl
;
355 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
357 tree current_function_func_begin_label
;
359 /* Nonzero if doing dwarf2 duplicate elimination. */
361 int flag_eliminate_dwarf2_dups
= 0;
363 /* Nonzero if generating code to do profiling. */
365 int profile_flag
= 0;
367 /* Nonzero if generating code to profile program flow graph arcs. */
369 int profile_arc_flag
= 0;
371 /* Nonzero if we should not attempt to generate thread-safe
372 code to profile program flow graph arcs. */
374 int flag_unsafe_profile_arcs
= 0;
376 /* Nonzero if generating info for gcov to calculate line test coverage. */
378 int flag_test_coverage
= 0;
380 /* Nonzero indicates that branch taken probabilities should be calculated. */
382 int flag_branch_probabilities
= 0;
384 /* Nonzero if basic blocks should be reordered. */
386 int flag_reorder_blocks
= 0;
388 /* Nonzero if functions should be reordered. */
390 int flag_reorder_functions
= 0;
392 /* Nonzero if registers should be renamed. */
394 int flag_rename_registers
= 0;
395 int flag_cprop_registers
= 0;
397 /* Nonzero for -pedantic switch: warn about anything
398 that standard spec forbids. */
402 /* Temporarily suppress certain warnings.
403 This is set while reading code from a system header file. */
405 int in_system_header
= 0;
407 /* Don't print functions as they are compiled. -quiet. */
411 /* Print times taken by the various passes. -ftime-report. */
415 /* Print memory still in use at end of compilation (which may have little
416 to do with peak memory consumption). -fmem-report. */
420 /* Non-zero means to collect statistics which might be expensive
421 and to print them when we are done. */
422 int flag_detailed_statistics
= 0;
427 /* Nonzero means `char' should be signed. */
429 int flag_signed_char
;
431 /* Nonzero means give an enum type only as many bytes as it needs. */
433 int flag_short_enums
;
435 /* Nonzero for -fcaller-saves: allocate values in regs that need to
436 be saved across function calls, if that produces overall better code.
437 Optional now, so people can test it. */
439 #ifdef DEFAULT_CALLER_SAVES
440 int flag_caller_saves
= 1;
442 int flag_caller_saves
= 0;
445 /* Nonzero if structures and unions should be returned in memory.
447 This should only be defined if compatibility with another compiler or
448 with an ABI is needed, because it results in slower code. */
450 #ifndef DEFAULT_PCC_STRUCT_RETURN
451 #define DEFAULT_PCC_STRUCT_RETURN 1
454 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
456 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
458 /* Nonzero for -fforce-mem: load memory value into a register
459 before arithmetic on it. This makes better cse but slower compilation. */
461 int flag_force_mem
= 0;
463 /* Nonzero for -fforce-addr: load memory address into a register before
464 reference to memory. This makes better cse but slower compilation. */
466 int flag_force_addr
= 0;
468 /* Nonzero for -fdefer-pop: don't pop args after each function call;
469 instead save them up to pop many calls' args with one insns. */
471 int flag_defer_pop
= 0;
473 /* Nonzero for -ffloat-store: don't allocate floats and doubles
474 in extended-precision registers. */
476 int flag_float_store
= 0;
478 /* Nonzero for -fcse-follow-jumps:
479 have cse follow jumps to do a more extensive job. */
481 int flag_cse_follow_jumps
;
483 /* Nonzero for -fcse-skip-blocks:
484 have cse follow a branch around a block. */
485 int flag_cse_skip_blocks
;
487 /* Nonzero for -fexpensive-optimizations:
488 perform miscellaneous relatively-expensive optimizations. */
489 int flag_expensive_optimizations
;
491 /* Nonzero for -fthread-jumps:
492 have jump optimize output of loop. */
494 int flag_thread_jumps
;
496 /* Nonzero enables strength-reduction in loop.c. */
498 int flag_strength_reduce
= 0;
500 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
501 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
502 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
505 int flag_unroll_loops
;
507 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
508 This is generally not a win. */
510 int flag_unroll_all_loops
;
512 /* Nonzero enables prefetch optimizations for arrays in loops. */
514 int flag_prefetch_loop_arrays
;
516 /* Nonzero forces all invariant computations in loops to be moved
519 int flag_move_all_movables
= 0;
521 /* Nonzero forces all general induction variables in loops to be
524 int flag_reduce_all_givs
= 0;
526 /* Nonzero to perform full register move optimization passes. This is the
529 int flag_regmove
= 0;
531 /* Nonzero for -fwritable-strings:
532 store string constants in data segment and don't uniquize them. */
534 int flag_writable_strings
= 0;
536 /* Nonzero means don't put addresses of constant functions in registers.
537 Used for compiling the Unix kernel, where strange substitutions are
538 done on the assembly output. */
540 int flag_no_function_cse
= 0;
542 /* Nonzero for -fomit-frame-pointer:
543 don't make a frame pointer in simple functions that don't require one. */
545 int flag_omit_frame_pointer
= 0;
547 /* Nonzero means place each function into its own section on those platforms
548 which support arbitrary section names and unlimited numbers of sections. */
550 int flag_function_sections
= 0;
552 /* ... and similar for data. */
554 int flag_data_sections
= 0;
556 /* Nonzero to inhibit use of define_optimization peephole opts. */
558 int flag_no_peephole
= 0;
560 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
562 int flag_optimize_sibling_calls
= 0;
564 /* Nonzero means the front end generally wants `errno' maintained by math
565 operations, like built-in SQRT. */
567 int flag_errno_math
= 1;
569 /* Nonzero means that unsafe floating-point math optimizations are allowed
570 for the sake of speed. IEEE compliance is not guaranteed, and operations
571 are allowed to assume that their arguments and results are "normal"
572 (e.g., nonnegative for SQRT). */
574 int flag_unsafe_math_optimizations
= 0;
576 /* Zero means that floating-point math operations cannot generate a
577 (user-visible) trap. This is the case, for example, in nonstop
578 IEEE 754 arithmetic. */
580 int flag_trapping_math
= 1;
582 /* 0 means straightforward implementation of complex divide acceptable.
583 1 means wide ranges of inputs must work for complex divide.
584 2 means C99-like requirements for complex divide (not yet implemented). */
586 int flag_complex_divide_method
= 0;
588 /* Nonzero means all references through pointers are volatile. */
592 /* Nonzero means treat all global and extern variables as volatile. */
594 int flag_volatile_global
;
596 /* Nonzero means treat all static variables as volatile. */
598 int flag_volatile_static
;
600 /* Nonzero means just do syntax checking; don't output anything. */
602 int flag_syntax_only
= 0;
604 /* Nonzero means perform global cse. */
606 static int flag_gcse
;
608 /* Nonzero means perform loop optimizer. */
610 static int flag_loop_optimize
;
612 /* Nonzero means perform crossjumping. */
614 static int flag_crossjumping
;
616 /* Nonzero means perform if conversion. */
618 static int flag_if_conversion
;
620 /* Nonzero means perform if conversion after reload. */
622 static int flag_if_conversion2
;
624 /* Nonzero means to use global dataflow analysis to eliminate
625 useless null pointer tests. */
627 static int flag_delete_null_pointer_checks
;
629 /* Nonzero means to do the enhanced load motion during gcse, which trys
630 to hoist loads by not killing them when a store to the same location
633 int flag_gcse_lm
= 1;
635 /* Nonzero means to perform store motion after gcse, which will try to
636 move stores closer to the exit block. Its not very effective without
639 int flag_gcse_sm
= 1;
641 /* Nonzero means to rerun cse after loop optimization. This increases
642 compilation time about 20% and picks up a few more common expressions. */
644 static int flag_rerun_cse_after_loop
;
646 /* Nonzero means to run loop optimizations twice. */
648 int flag_rerun_loop_opt
;
650 /* Nonzero for -finline-functions: ok to inline functions that look like
651 good inline candidates. */
653 int flag_inline_functions
;
655 /* Nonzero for -fkeep-inline-functions: even if we make a function
656 go inline everywhere, keep its definition around for debugging
659 int flag_keep_inline_functions
;
661 /* Nonzero means that functions will not be inlined. */
663 int flag_no_inline
= 2;
665 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
666 not just because the tree inliner turned us off. */
668 int flag_really_no_inline
= 2;
670 /* Nonzero means that we should emit static const variables
671 regardless of whether or not optimization is turned on. */
673 int flag_keep_static_consts
= 1;
675 /* Nonzero means we should be saving declaration info into a .X file. */
677 int flag_gen_aux_info
= 0;
679 /* Specified name of aux-info file. */
681 static char *aux_info_file_name
;
683 /* Nonzero means make the text shared if supported. */
685 int flag_shared_data
;
687 /* Nonzero means schedule into delayed branch slots if supported. */
689 int flag_delayed_branch
;
691 /* Nonzero if we are compiling pure (sharable) code.
692 Value is 1 if we are doing "small" pic; value is 2 if we're doing
697 /* Set to the default thread-local storage (tls) model to use. */
699 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
701 /* Nonzero means generate extra code for exception handling and enable
702 exception handling. */
706 /* Nonzero means generate frame unwind info table when supported. */
708 int flag_unwind_tables
= 0;
710 /* Nonzero means generate frame unwind info table exact at each insn boundary */
712 int flag_asynchronous_unwind_tables
= 0;
714 /* Nonzero means don't place uninitialized global data in common storage
719 /* Nonzero means change certain warnings into errors.
720 Usually these are warnings about failure to conform to some standard. */
722 int flag_pedantic_errors
= 0;
724 /* flag_schedule_insns means schedule insns within basic blocks (before
726 flag_schedule_insns_after_reload means schedule insns after
729 int flag_schedule_insns
= 0;
730 int flag_schedule_insns_after_reload
= 0;
732 /* The following flags have effect only for scheduling before register
735 flag_schedule_interblock means schedule insns accross basic blocks.
736 flag_schedule_speculative means allow speculative motion of non-load insns.
737 flag_schedule_speculative_load means allow speculative motion of some
739 flag_schedule_speculative_load_dangerous allows speculative motion of more
742 int flag_schedule_interblock
= 1;
743 int flag_schedule_speculative
= 1;
744 int flag_schedule_speculative_load
= 0;
745 int flag_schedule_speculative_load_dangerous
= 0;
747 int flag_single_precision_constant
;
749 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
750 by a cheaper branch on a count register. */
751 int flag_branch_on_count_reg
= 1;
753 /* -finhibit-size-directive inhibits output of .size for ELF.
754 This is used only for compiling crtstuff.c,
755 and it may be extended to other effects
756 needed for crtstuff.c on other systems. */
757 int flag_inhibit_size_directive
= 0;
759 /* -fverbose-asm causes extra commentary information to be produced in
760 the generated assembly code (to make it more readable). This option
761 is generally only of use to those who actually need to read the
762 generated assembly code (perhaps while debugging the compiler itself).
763 -fno-verbose-asm, the default, causes the extra information
764 to be omitted and is useful when comparing two assembler files. */
766 int flag_verbose_asm
= 0;
768 /* -dA causes debug commentary information to be produced in
769 the generated assembly code (to make it more readable). This option
770 is generally only of use to those who actually need to read the
771 generated assembly code (perhaps while debugging the compiler itself).
772 Currently, this switch is only used by dwarfout.c; however, it is intended
773 to be a catchall for printing debug information in the assembler file. */
775 int flag_debug_asm
= 0;
777 /* -dP causes the rtl to be emitted as a comment in assembly. */
779 int flag_dump_rtl_in_asm
= 0;
781 /* -fgnu-linker specifies use of the GNU linker for initializations.
782 (Or, more generally, a linker that handles initializations.)
783 -fno-gnu-linker says that collect2 will be used. */
785 int flag_gnu_linker
= 0;
787 int flag_gnu_linker
= 1;
790 /* Nonzero means put zero initialized data in the bss section. */
791 int flag_zero_initialized_in_bss
= 1;
796 /* Enable ssa conditional constant propagation. */
797 int flag_ssa_ccp
= 0;
799 /* Enable ssa aggressive dead code elimination. */
800 int flag_ssa_dce
= 0;
802 /* Tag all structures with __attribute__(packed). */
803 int flag_pack_struct
= 0;
805 /* Emit code to check for stack overflow; also may cause large objects
806 to be allocated dynamically. */
807 int flag_stack_check
;
809 /* When non-NULL, indicates that whenever space is allocated on the
810 stack, the resulting stack pointer must not pass this
811 address---that is, for stacks that grow downward, the stack pointer
812 must always be greater than or equal to this address; for stacks
813 that grow upward, the stack pointer must be less than this address.
814 At present, the rtx may be either a REG or a SYMBOL_REF, although
815 the support provided depends on the backend. */
818 /* 0 if pointer arguments may alias each other. True in C.
819 1 if pointer arguments may not alias each other but may alias
821 2 if pointer arguments may not alias each other and may not
822 alias global variables. True in Fortran.
823 This defaults to 0 for C. */
824 int flag_argument_noalias
= 0;
826 /* Nonzero if we should do (language-dependent) alias analysis.
827 Typically, this analysis will assume that expressions of certain
828 types do not alias expressions of certain other types. Only used
829 if alias analysis (in general) is enabled. */
830 int flag_strict_aliasing
= 0;
832 /* Instrument functions with calls at entry and exit, for profiling. */
833 int flag_instrument_function_entry_exit
= 0;
835 /* Nonzero means ignore `#ident' directives. 0 means handle them.
836 On SVR4 targets, it also controls whether or not to emit a
837 string identifying the compiler. */
839 int flag_no_ident
= 0;
841 /* This will perform a peephole pass before sched2. */
842 int flag_peephole2
= 0;
844 /* This will try to guess branch probabilities. */
845 int flag_guess_branch_prob
= 0;
847 /* -fbounded-pointers causes gcc to compile pointers as composite
848 objects occupying three words: the pointer value, the base address
849 of the referent object, and the address immediately beyond the end
850 of the referent object. The base and extent allow us to perform
851 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
852 int flag_bounded_pointers
= 0;
854 /* -fcheck-bounds causes gcc to generate array bounds checks.
855 For C, C++: defaults to value of flag_bounded_pointers.
856 For ObjC: defaults to off.
857 For Java: defaults to on.
858 For Fortran: defaults to off.
859 For CHILL: defaults to off. */
860 int flag_bounds_check
= 0;
862 /* This will attempt to merge constant section constants, if 1 only
863 string constants and constants from constant pool, if 2 also constant
865 int flag_merge_constants
= 1;
867 /* If one, renumber instruction UIDs to reduce the number of
868 unused UIDs if there are a lot of instructions. If greater than
869 one, unconditionally renumber instruction UIDs. */
870 int flag_renumber_insns
= 1;
872 /* Nonzero if we perform superblock formation. */
876 /* Values of the -falign-* flags: how much to align labels in code.
877 0 means `use default', 1 means `don't align'.
878 For each variable, there is an _log variant which is the power
879 of two not less than the variable, for .align output. */
883 int align_loops_max_skip
;
886 int align_jumps_max_skip
;
888 int align_labels_log
;
889 int align_labels_max_skip
;
891 int align_functions_log
;
893 /* Table of supported debugging formats. */
896 const char *const arg
;
897 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
898 constant expression, we use NO_DEBUG in its place. */
899 const enum debug_info_type debug_type
;
900 const int use_extensions_p
;
901 const char *const description
;
905 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
906 N_("Generate debugging info in default format") },
907 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
908 #ifdef DBX_DEBUGGING_INFO
909 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
910 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
912 #ifdef DWARF_DEBUGGING_INFO
913 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
914 { "dwarf+", DWARF_DEBUG
, 1,
915 N_("Generate extended DWARF-1 format debug info") },
917 #ifdef DWARF2_DEBUGGING_INFO
918 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
920 #ifdef XCOFF_DEBUGGING_INFO
921 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
922 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
924 #ifdef SDB_DEBUGGING_INFO
925 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
927 #ifdef VMS_DEBUGGING_INFO
928 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
935 const char *const string
;
938 const char *const description
;
940 lang_independent_options
;
944 /* Add or remove a leading underscore from user symbols. */
945 int flag_leading_underscore
= -1;
947 /* The user symbol prefix after having resolved same. */
948 const char *user_label_prefix
;
950 static const param_info lang_independent_params
[] = {
951 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
952 { OPTION, DEFAULT, HELP },
953 #include "params.def"
958 /* A default for same. */
959 #ifndef USER_LABEL_PREFIX
960 #define USER_LABEL_PREFIX ""
963 /* Table of language-independent -f options.
964 STRING is the option name. VARIABLE is the address of the variable.
965 ON_VALUE is the value to store in VARIABLE
966 if `-fSTRING' is seen as an option.
967 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
969 static const lang_independent_options f_options
[] =
971 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
972 N_("Perform DWARF2 duplicate elimination") },
973 {"float-store", &flag_float_store
, 1,
974 N_("Do not store floats in registers") },
975 {"volatile", &flag_volatile
, 1,
976 N_("Consider all mem refs through pointers as volatile") },
977 {"volatile-global", &flag_volatile_global
, 1,
978 N_("Consider all mem refs to global data to be volatile") },
979 {"volatile-static", &flag_volatile_static
, 1,
980 N_("Consider all mem refs to static data to be volatile") },
981 {"defer-pop", &flag_defer_pop
, 1,
982 N_("Defer popping functions args from stack until later") },
983 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
984 N_("When possible do not generate stack frames") },
985 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
986 N_("Optimize sibling and tail recursive calls") },
987 {"tracer", &flag_tracer
, 1,
988 N_("Perform superblock formation via tail duplication") },
989 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
990 N_("When running CSE, follow jumps to their targets") },
991 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
992 N_("When running CSE, follow conditional jumps") },
993 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
994 N_("Perform a number of minor, expensive optimizations") },
995 {"thread-jumps", &flag_thread_jumps
, 1,
996 N_("Perform jump threading optimizations") },
997 {"strength-reduce", &flag_strength_reduce
, 1,
998 N_("Perform strength reduction optimizations") },
999 {"unroll-loops", &flag_unroll_loops
, 1,
1000 N_("Perform loop unrolling when iteration count is known") },
1001 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1002 N_("Perform loop unrolling for all loops") },
1003 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1,
1004 N_("Generate prefetch instructions, if available, for arrays in loops") },
1005 {"move-all-movables", &flag_move_all_movables
, 1,
1006 N_("Force all loop invariant computations out of loops") },
1007 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1008 N_("Strength reduce all loop general induction variables") },
1009 {"writable-strings", &flag_writable_strings
, 1,
1010 N_("Store strings in writable data section") },
1011 {"peephole", &flag_no_peephole
, 0,
1012 N_("Enable machine specific peephole optimizations") },
1013 {"force-mem", &flag_force_mem
, 1,
1014 N_("Copy memory operands into registers before using") },
1015 {"force-addr", &flag_force_addr
, 1,
1016 N_("Copy memory address constants into regs before using") },
1017 {"function-cse", &flag_no_function_cse
, 0,
1018 N_("Allow function addresses to be held in registers") },
1019 {"inline-functions", &flag_inline_functions
, 1,
1020 N_("Integrate simple functions into their callers") },
1021 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1022 N_("Generate code for funcs even if they are fully inlined") },
1023 {"inline", &flag_no_inline
, 0,
1024 N_("Pay attention to the 'inline' keyword") },
1025 {"keep-static-consts", &flag_keep_static_consts
, 1,
1026 N_("Emit static const variables even if they are not used") },
1027 {"syntax-only", &flag_syntax_only
, 1,
1028 N_("Check for syntax errors, then stop") },
1029 {"shared-data", &flag_shared_data
, 1,
1030 N_("Mark data as shared rather than private") },
1031 {"caller-saves", &flag_caller_saves
, 1,
1032 N_("Enable saving registers around function calls") },
1033 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1034 N_("Return 'short' aggregates in memory, not registers") },
1035 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1036 N_("Return 'short' aggregates in registers") },
1037 {"delayed-branch", &flag_delayed_branch
, 1,
1038 N_("Attempt to fill delay slots of branch instructions") },
1039 {"gcse", &flag_gcse
, 1,
1040 N_("Perform the global common subexpression elimination") },
1041 {"gcse-lm", &flag_gcse_lm
, 1,
1042 N_("Perform enhanced load motion during global subexpression elimination") },
1043 {"gcse-sm", &flag_gcse_sm
, 1,
1044 N_("Perform store motion after global subexpression elimination") },
1045 {"loop-optimize", &flag_loop_optimize
, 1,
1046 N_("Perform the loop optimizations") },
1047 {"crossjumping", &flag_crossjumping
, 1,
1048 N_("Perform cross-jumping optimization") },
1049 {"if-conversion", &flag_if_conversion
, 1,
1050 N_("Perform conversion of conditional jumps to branchless equivalents") },
1051 {"if-conversion2", &flag_if_conversion2
, 1,
1052 N_("Perform conversion of conditional jumps to conditional execution") },
1053 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1054 N_("Run CSE pass after loop optimizations") },
1055 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1056 N_("Run the loop optimizer twice") },
1057 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1058 N_("Delete useless null pointer checks") },
1059 {"schedule-insns", &flag_schedule_insns
, 1,
1060 N_("Reschedule instructions before register allocation") },
1061 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1062 N_("Reschedule instructions after register allocation") },
1063 {"sched-interblock",&flag_schedule_interblock
, 1,
1064 N_("Enable scheduling across basic blocks") },
1065 {"sched-spec",&flag_schedule_speculative
, 1,
1066 N_("Allow speculative motion of non-loads") },
1067 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1068 N_("Allow speculative motion of some loads") },
1069 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1070 N_("Allow speculative motion of more loads") },
1071 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1072 N_("Replace add,compare,branch with branch on count reg") },
1073 {"pic", &flag_pic
, 1,
1074 N_("Generate position independent code, if possible") },
1075 {"PIC", &flag_pic
, 2, ""},
1076 {"exceptions", &flag_exceptions
, 1,
1077 N_("Enable exception handling") },
1078 {"unwind-tables", &flag_unwind_tables
, 1,
1079 N_("Just generate unwind tables for exception handling") },
1080 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1,
1081 N_("Generate unwind tables exact at each instruction boundary") },
1082 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1083 N_("Support synchronous non-call exceptions") },
1084 {"profile-arcs", &profile_arc_flag
, 1,
1085 N_("Insert arc based program profiling code") },
1086 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs
, 1,
1087 N_("Avoid thread safety profiling overhead") },
1088 {"test-coverage", &flag_test_coverage
, 1,
1089 N_("Create data files needed by gcov") },
1090 {"branch-probabilities", &flag_branch_probabilities
, 1,
1091 N_("Use profiling information for branch probabilities") },
1092 {"profile", &profile_flag
, 1,
1093 N_("Enable basic program profiling code") },
1094 {"reorder-blocks", &flag_reorder_blocks
, 1,
1095 N_("Reorder basic blocks to improve code placement") },
1096 {"reorder-functions", &flag_reorder_functions
, 1,
1097 N_("Reorder functions to improve code placement") },
1098 {"rename-registers", &flag_rename_registers
, 1,
1099 N_("Do the register renaming optimization pass") },
1100 {"cprop-registers", &flag_cprop_registers
, 1,
1101 N_("Do the register copy-propagation optimization pass") },
1102 {"common", &flag_no_common
, 0,
1103 N_("Do not put uninitialized globals in the common section") },
1104 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1105 N_("Do not generate .size directives") },
1106 {"function-sections", &flag_function_sections
, 1,
1107 N_("place each function into its own section") },
1108 {"data-sections", &flag_data_sections
, 1,
1109 N_("place data items into their own section") },
1110 {"verbose-asm", &flag_verbose_asm
, 1,
1111 N_("Add extra commentry to assembler output") },
1112 {"gnu-linker", &flag_gnu_linker
, 1,
1113 N_("Output GNU ld formatted global initializers") },
1114 {"regmove", &flag_regmove
, 1,
1115 N_("Enables a register move optimization") },
1116 {"optimize-register-move", &flag_regmove
, 1,
1117 N_("Do the full regmove optimization pass") },
1118 {"pack-struct", &flag_pack_struct
, 1,
1119 N_("Pack structure members together without holes") },
1120 {"stack-check", &flag_stack_check
, 1,
1121 N_("Insert stack checking code into the program") },
1122 {"argument-alias", &flag_argument_noalias
, 0,
1123 N_("Specify that arguments may alias each other & globals") },
1124 {"argument-noalias", &flag_argument_noalias
, 1,
1125 N_("Assume arguments may alias globals but not each other") },
1126 {"argument-noalias-global", &flag_argument_noalias
, 2,
1127 N_("Assume arguments do not alias each other or globals") },
1128 {"strict-aliasing", &flag_strict_aliasing
, 1,
1129 N_("Assume strict aliasing rules apply") },
1130 {"align-loops", &align_loops
, 0,
1131 N_("Align the start of loops") },
1132 {"align-jumps", &align_jumps
, 0,
1133 N_("Align labels which are only reached by jumping") },
1134 {"align-labels", &align_labels
, 0,
1135 N_("Align all labels") },
1136 {"align-functions", &align_functions
, 0,
1137 N_("Align the start of functions") },
1138 {"merge-constants", &flag_merge_constants
, 1,
1139 N_("Attempt to merge identical constants accross compilation units") },
1140 {"merge-all-constants", &flag_merge_constants
, 2,
1141 N_("Attempt to merge identical constants and constant variables") },
1142 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1143 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1144 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1145 N_("Instrument function entry/exit with profiling calls") },
1146 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1,
1147 N_("Put zero initialized data in the bss section") },
1148 {"ssa", &flag_ssa
, 1,
1149 N_("Enable SSA optimizations") },
1150 {"ssa-ccp", &flag_ssa_ccp
, 1,
1151 N_("Enable SSA conditional constant propagation") },
1152 {"ssa-dce", &flag_ssa_dce
, 1,
1153 N_("Enable aggressive SSA dead code elimination") },
1154 {"leading-underscore", &flag_leading_underscore
, 1,
1155 N_("External symbols have a leading underscore") },
1156 {"ident", &flag_no_ident
, 0,
1157 N_("Process #ident directives") },
1158 { "peephole2", &flag_peephole2
, 1,
1159 N_("Enables an rtl peephole pass run before sched2") },
1160 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1161 N_("Enables guessing of branch probabilities") },
1162 {"math-errno", &flag_errno_math
, 1,
1163 N_("Set errno after built-in math functions") },
1164 {"trapping-math", &flag_trapping_math
, 1,
1165 N_("Floating-point operations can trap") },
1166 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1167 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1168 {"bounded-pointers", &flag_bounded_pointers
, 1,
1169 N_("Compile pointers as triples: value, base & end") },
1170 {"bounds-check", &flag_bounds_check
, 1,
1171 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1172 {"single-precision-constant", &flag_single_precision_constant
, 1,
1173 N_("Convert floating point constant to single precision constant") },
1174 {"time-report", &time_report
, 1,
1175 N_("Report time taken by each compiler pass at end of run") },
1176 {"mem-report", &mem_report
, 1,
1177 N_("Report on permanent memory allocation at end of run") },
1178 { "trapv", &flag_trapv
, 1,
1179 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1182 /* Table of language-specific options. */
1184 static const struct lang_opt
1186 const char *const option
;
1187 const char *const description
;
1189 documented_lang_options
[] =
1191 /* In order not to overload the --help output, the convention
1192 used here is to only describe those options which are not
1193 enabled by default. */
1196 N_("Compile just for ISO C89") },
1198 N_("Determine language standard") },
1200 { "-fsigned-bitfields", "" },
1201 { "-funsigned-bitfields",
1202 N_("Make bit-fields by unsigned by default") },
1203 { "-fno-signed-bitfields", "" },
1204 { "-fno-unsigned-bitfields","" },
1206 N_("Make 'char' be signed by default") },
1207 { "-funsigned-char",
1208 N_("Make 'char' be unsigned by default") },
1209 { "-fno-signed-char", "" },
1210 { "-fno-unsigned-char", "" },
1214 N_("Do not recognize the 'asm' keyword") },
1215 { "-fbuiltin", "" },
1217 N_("Do not recognize any built in functions") },
1219 N_("Assume normal C execution environment") },
1220 { "-fno-hosted", "" },
1222 N_("Assume that standard libraries & main might not exist") },
1223 { "-fno-freestanding", "" },
1224 { "-fcond-mismatch",
1225 N_("Allow different types as args of ? operator") },
1226 { "-fno-cond-mismatch", "" },
1227 { "-fdollars-in-identifiers",
1228 N_("Allow the use of $ inside identifiers") },
1229 { "-fno-dollars-in-identifiers", "" },
1230 { "-fpreprocessed", "" },
1231 { "-fno-preprocessed", "" },
1233 N_("Use the same size for double as for float") },
1234 { "-fno-short-double", "" },
1236 N_("Use the smallest fitting integer to hold enums") },
1237 { "-fno-short-enums", "" },
1239 N_("Override the underlying type for wchar_t to `unsigned short'") },
1240 { "-fno-short-wchar", "" },
1243 N_("Enable most warning messages") },
1244 { "-Wbad-function-cast",
1245 N_("Warn about casting functions to incompatible types") },
1246 { "-Wno-bad-function-cast", "" },
1247 { "-Wmissing-format-attribute",
1248 N_("Warn about functions which might be candidates for format attributes") },
1249 { "-Wno-missing-format-attribute", "" },
1251 N_("Warn about casts which discard qualifiers") },
1252 { "-Wno-cast-qual", "" },
1253 { "-Wchar-subscripts",
1254 N_("Warn about subscripts whose type is 'char'") },
1255 { "-Wno-char-subscripts", "" },
1257 N_("Warn if nested comments are detected") },
1258 { "-Wno-comment", "" },
1260 N_("Warn if nested comments are detected") },
1261 { "-Wno-comments", "" },
1263 N_("Warn about possibly confusing type conversions") },
1264 { "-Wno-conversion", "" },
1265 { "-Wdiv-by-zero", "" },
1266 { "-Wno-div-by-zero",
1267 N_("Do not warn about compile-time integer division by zero") },
1269 N_("Warn about testing equality of floating point numbers") },
1270 { "-Wno-float-equal", "" },
1272 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1273 { "-Wno-format", "" },
1274 { "-Wformat-extra-args", "" },
1275 { "-Wno-format-extra-args",
1276 N_("Don't warn about too many arguments to format functions") },
1277 { "-Wformat-nonliteral",
1278 N_("Warn about non-string-literal format strings") },
1279 { "-Wno-format-nonliteral", "" },
1280 { "-Wformat-security",
1281 N_("Warn about possible security problems with format functions") },
1282 { "-Wno-format-security", "" },
1283 { "-Wformat-y2k", "" },
1284 { "-Wno-format-y2k",
1285 N_("Don't warn about strftime formats yielding 2 digit years") },
1286 { "-Wimplicit-function-declaration",
1287 N_("Warn about implicit function declarations") },
1288 { "-Wno-implicit-function-declaration", "" },
1289 { "-Werror-implicit-function-declaration", "" },
1291 N_("Warn when a declaration does not specify a type") },
1292 { "-Wno-implicit-int", "" },
1293 { "-Wimplicit", "" },
1294 { "-Wno-implicit", "" },
1296 N_("Warn about the use of the #import directive") },
1297 { "-Wno-import", "" },
1298 { "-Wlong-long","" },
1300 N_("Do not warn about using 'long long' when -pedantic") },
1302 N_("Warn about suspicious declarations of main") },
1303 { "-Wno-main", "" },
1304 { "-Wmissing-braces",
1305 N_("Warn about possibly missing braces around initializers") },
1306 { "-Wno-missing-braces", "" },
1307 { "-Wmissing-declarations",
1308 N_("Warn about global funcs without previous declarations") },
1309 { "-Wno-missing-declarations", "" },
1310 { "-Wmissing-prototypes",
1311 N_("Warn about global funcs without prototypes") },
1312 { "-Wno-missing-prototypes", "" },
1314 N_("Warn about use of multicharacter literals") },
1315 { "-Wno-multichar", "" },
1316 { "-Wnested-externs",
1317 N_("Warn about externs not at file scope level") },
1318 { "-Wno-nested-externs", "" },
1320 N_("Warn about possible missing parentheses") },
1321 { "-Wno-parentheses", "" },
1322 { "-Wpointer-arith",
1323 N_("Warn about function pointer arithmetic") },
1324 { "-Wno-pointer-arith", "" },
1325 { "-Wredundant-decls",
1326 N_("Warn about multiple declarations of the same object") },
1327 { "-Wno-redundant-decls", "" },
1329 N_("Warn whenever a function's return-type defaults to int") },
1330 { "-Wno-return-type", "" },
1331 { "-Wsequence-point",
1332 N_("Warn about possible violations of sequence point rules") },
1333 { "-Wno-sequence-point", "" },
1335 N_("Warn about signed/unsigned comparisons") },
1336 { "-Wno-sign-compare", "" },
1337 { "-Wstrict-prototypes",
1338 N_("Warn about non-prototyped function decls") },
1339 { "-Wno-strict-prototypes", "" },
1341 N_("Warn about constructs whose meanings change in ISO C") },
1342 { "-Wno-traditional", "" },
1344 N_("Warn when trigraphs are encountered") },
1345 { "-Wno-trigraphs", "" },
1347 { "-Wno-undef", "" },
1348 { "-Wunknown-pragmas",
1349 N_("Warn about unrecognized pragmas") },
1350 { "-Wno-unknown-pragmas", "" },
1351 { "-Wwrite-strings",
1352 N_("Mark strings as 'const char *'") },
1353 { "-Wno-write-strings", "" },
1355 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1357 #include "options.h"
1361 /* Here is a table, controlled by the tm.h file, listing each -m switch
1362 and which bits in `target_switches' it should set or clear.
1363 If VALUE is positive, it is bits to set.
1364 If VALUE is negative, -VALUE is bits to clear.
1365 (The sign bit is not used so there is no confusion.) */
1369 const char *const name
;
1371 const char *const description
;
1373 target_switches
[] = TARGET_SWITCHES
;
1375 /* This table is similar, but allows the switch to have a value. */
1377 #ifdef TARGET_OPTIONS
1380 const char *const prefix
;
1381 const char **const variable
;
1382 const char *const description
;
1384 target_options
[] = TARGET_OPTIONS
;
1387 /* Options controlling warnings. */
1389 /* Don't print warning messages. -w. */
1391 int inhibit_warnings
= 0;
1393 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1395 int warn_system_headers
= 0;
1397 /* Print various extra warnings. -W. */
1399 int extra_warnings
= 0;
1401 /* Treat warnings as errors. -Werror. */
1403 int warnings_are_errors
= 0;
1405 /* Nonzero to warn about unused variables, functions et.al. */
1407 int warn_unused_function
;
1408 int warn_unused_label
;
1409 int warn_unused_parameter
;
1410 int warn_unused_variable
;
1411 int warn_unused_value
;
1413 /* Nonzero to warn about code which is never reached. */
1415 int warn_notreached
;
1417 /* Nonzero to warn about variables used before they are initialized. */
1419 int warn_uninitialized
;
1421 /* Nonzero means warn about all declarations which shadow others. */
1425 /* Warn if a switch on an enum, that does not have a default case,
1426 fails to have a case for every enum value. */
1430 /* Warn if a switch does not have a default case. */
1432 int warn_switch_default
;
1434 /* Warn if a switch on an enum fails to have a case for every enum
1435 value (regardless of the presence or otherwise of a default case). */
1437 int warn_switch_enum
;
1439 /* Nonzero means warn about function definitions that default the return type
1440 or that use a null return and have a return-type other than void. */
1442 int warn_return_type
;
1444 /* Nonzero means warn about pointer casts that increase the required
1445 alignment of the target type (and might therefore lead to a crash
1446 due to a misaligned access). */
1448 int warn_cast_align
;
1450 /* Nonzero means warn about any objects definitions whose size is larger
1451 than N bytes. Also want about function definitions whose returned
1452 values are larger than N bytes. The value N is in `larger_than_size'. */
1454 int warn_larger_than
;
1455 HOST_WIDE_INT larger_than_size
;
1457 /* Nonzero means warn if inline function is too large. */
1461 /* Warn if a function returns an aggregate,
1462 since there are often incompatible calling conventions for doing this. */
1464 int warn_aggregate_return
;
1466 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1470 /* Warn when gcc pads a structure to an alignment boundary. */
1474 /* Warn when an optimization pass is disabled. */
1476 int warn_disabled_optimization
;
1478 /* Warn about functions which might be candidates for attribute noreturn. */
1480 int warn_missing_noreturn
;
1482 /* Nonzero means warn about uses of __attribute__((deprecated))
1485 int warn_deprecated_decl
= 1;
1487 /* Likewise for -W. */
1489 static const lang_independent_options W_options
[] =
1491 {"unused-function", &warn_unused_function
, 1,
1492 N_("Warn when a function is unused") },
1493 {"unused-label", &warn_unused_label
, 1,
1494 N_("Warn when a label is unused") },
1495 {"unused-parameter", &warn_unused_parameter
, 1,
1496 N_("Warn when a function parameter is unused") },
1497 {"unused-variable", &warn_unused_variable
, 1,
1498 N_("Warn when a variable is unused") },
1499 {"unused-value", &warn_unused_value
, 1,
1500 N_("Warn when an expression value is unused") },
1501 {"system-headers", &warn_system_headers
, 1,
1502 N_("Do not suppress warnings from system headers") },
1503 {"error", &warnings_are_errors
, 1,
1504 N_("Treat all warnings as errors") },
1505 {"shadow", &warn_shadow
, 1,
1506 N_("Warn when one local variable shadows another") },
1507 {"switch", &warn_switch
, 1,
1508 N_("Warn about enumerated switches, with no default, missing a case") },
1509 {"switch-default", &warn_switch_default
, 1,
1510 N_("Warn about enumerated switches missing a default case") },
1511 {"switch-enum", &warn_switch_enum
, 1,
1512 N_("Warn about all enumerated switches missing a specific case") },
1513 {"aggregate-return", &warn_aggregate_return
, 1,
1514 N_("Warn about returning structures, unions or arrays") },
1515 {"cast-align", &warn_cast_align
, 1,
1516 N_("Warn about pointer casts which increase alignment") },
1517 {"unreachable-code", &warn_notreached
, 1,
1518 N_("Warn about code that will never be executed") },
1519 {"uninitialized", &warn_uninitialized
, 1,
1520 N_("Warn about uninitialized automatic variables") },
1521 {"inline", &warn_inline
, 1,
1522 N_("Warn when an inlined function cannot be inlined") },
1523 {"packed", &warn_packed
, 1,
1524 N_("Warn when the packed attribute has no effect on struct layout") },
1525 {"padded", &warn_padded
, 1,
1526 N_("Warn when padding is required to align struct members") },
1527 {"disabled-optimization", &warn_disabled_optimization
, 1,
1528 N_("Warn when an optimization pass is disabled") },
1529 {"deprecated-declarations", &warn_deprecated_decl
, 1,
1530 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1531 {"missing-noreturn", &warn_missing_noreturn
, 1,
1532 N_("Warn about functions which might be candidates for attribute noreturn") }
1536 set_Wunused (setting
)
1539 warn_unused_function
= setting
;
1540 warn_unused_label
= setting
;
1541 /* Unused function parameter warnings are reported when either ``-W
1542 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1543 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1545 warn_unused_parameter
= 0;
1546 else if (!warn_unused_parameter
)
1547 warn_unused_parameter
= -1;
1548 warn_unused_variable
= setting
;
1549 warn_unused_value
= setting
;
1552 /* The following routines are useful in setting all the flags that
1553 -ffast-math and -fno-fast-math imply. */
1556 set_fast_math_flags (int set
)
1558 flag_trapping_math
= !set
;
1559 flag_unsafe_math_optimizations
= set
;
1560 flag_errno_math
= !set
;
1563 /* Return true iff flags are set as if -ffast-math. */
1565 fast_math_flags_set_p ()
1567 return (!flag_trapping_math
1568 && flag_unsafe_math_optimizations
1569 && !flag_errno_math
);
1573 /* Output files for assembler code (real compiler output)
1574 and debugging dumps. */
1577 FILE *aux_info_file
;
1578 FILE *rtl_dump_file
= NULL
;
1580 /* Decode the string P as an integral parameter.
1581 If the string is indeed an integer return its numeric value else
1582 issue an Invalid Option error for the option PNAME and return DEFVAL.
1583 If PNAME is zero just return DEFVAL, do not call error. */
1586 read_integral_parameter (p
, pname
, defval
)
1591 const char *endp
= p
;
1595 if (ISDIGIT (*endp
))
1604 error ("invalid option `%s'", pname
);
1611 /* This calls abort and is used to avoid problems when abort if a macro.
1612 It is used when we need to pass the address of abort. */
1620 /* When `malloc.c' is compiled with `rcheck' defined,
1621 it calls this function to report clobberage. */
1625 const char *s ATTRIBUTE_UNUSED
;
1630 /* Return the logarithm of X, base 2, considering X unsigned,
1631 if X is a power of 2. Otherwise, returns -1.
1633 This should be used via the `exact_log2' macro. */
1637 unsigned HOST_WIDE_INT x
;
1640 /* Test for 0 or a power of 2. */
1641 if (x
== 0 || x
!= (x
& -x
))
1643 while ((x
>>= 1) != 0)
1648 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1649 If X is 0, return -1.
1651 This should be used via the floor_log2 macro. */
1655 unsigned HOST_WIDE_INT x
;
1664 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1665 into ICE messages, which is much more user friendly. */
1668 crash_signal (signo
)
1671 internal_error ("internal error: %s", strsignal (signo
));
1674 /* Strip off a legitimate source ending from the input string NAME of
1675 length LEN. Rather than having to know the names used by all of
1676 our front ends, we strip off an ending of a period followed by
1677 up to five characters. (Java uses ".class".) */
1680 strip_off_ending (name
, len
)
1685 for (i
= 2; i
< 6 && len
> i
; i
++)
1687 if (name
[len
- i
] == '.')
1689 name
[len
- i
] = '\0';
1695 /* Output a quoted string. */
1698 output_quoted_string (asm_file
, string
)
1702 #ifdef OUTPUT_QUOTED_STRING
1703 OUTPUT_QUOTED_STRING (asm_file
, string
);
1707 putc ('\"', asm_file
);
1708 while ((c
= *string
++) != 0)
1712 if (c
== '\"' || c
== '\\')
1713 putc ('\\', asm_file
);
1717 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1719 putc ('\"', asm_file
);
1723 /* Output NAME into FILE after having turned it into something
1724 usable as an identifier in a target's assembly file. */
1726 output_clean_symbol_name (file
, name
)
1730 /* Make a copy of NAME. */
1731 char *id
= xstrdup (name
);
1733 /* Make it look like a valid identifier for an assembler. */
1734 clean_symbol_name (id
);
1741 /* Output a file name in the form wanted by System V. */
1744 output_file_directive (asm_file
, input_name
)
1746 const char *input_name
;
1748 int len
= strlen (input_name
);
1749 const char *na
= input_name
+ len
;
1751 /* NA gets INPUT_NAME sans directory names. */
1752 while (na
> input_name
)
1754 if (IS_DIR_SEPARATOR (na
[-1]))
1759 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1760 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1762 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1763 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1765 fprintf (asm_file
, "\t.file\t");
1766 output_quoted_string (asm_file
, na
);
1767 fputc ('\n', asm_file
);
1772 /* Routine to open a dump file. Return true if the dump file is enabled. */
1775 open_dump_file (index
, decl
)
1776 enum dump_file_index index
;
1780 const char *open_arg
;
1783 if (! dump_file
[index
].enabled
)
1786 timevar_push (TV_DUMP
);
1787 if (rtl_dump_file
!= NULL
)
1788 fclose (rtl_dump_file
);
1790 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1792 if (! dump_file
[index
].initialized
)
1794 /* If we've not initialized the files, do so now. */
1795 if (graph_dump_format
!= no_graph
1796 && dump_file
[index
].graph_dump_p
)
1798 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1799 clean_graph_dump_file (dump_base_name
, dump_name
);
1802 dump_file
[index
].initialized
= 1;
1808 dump_name
= concat (dump_base_name
, seq
,
1809 dump_file
[index
].extension
, NULL
);
1811 rtl_dump_file
= fopen (dump_name
, open_arg
);
1812 if (rtl_dump_file
== NULL
)
1813 fatal_io_error ("can't open %s", dump_name
);
1818 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1819 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1820 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1822 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1823 ? " (unlikely executed)"
1826 timevar_pop (TV_DUMP
);
1830 /* Routine to close a dump file. */
1833 close_dump_file (index
, func
, insns
)
1834 enum dump_file_index index
;
1835 void (*func
) PARAMS ((FILE *, rtx
));
1838 if (! rtl_dump_file
)
1841 timevar_push (TV_DUMP
);
1843 && graph_dump_format
!= no_graph
1844 && dump_file
[index
].graph_dump_p
)
1849 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1850 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1851 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1856 func (rtl_dump_file
, insns
);
1858 fflush (rtl_dump_file
);
1859 fclose (rtl_dump_file
);
1861 rtl_dump_file
= NULL
;
1862 timevar_pop (TV_DUMP
);
1865 /* Do any final processing required for the declarations in VEC, of
1866 which there are LEN. We write out inline functions and variables
1867 that have been deferred until this point, but which are required.
1868 Returns non-zero if anything was put out. */
1871 wrapup_global_declarations (vec
, len
)
1878 int output_something
= 0;
1880 for (i
= 0; i
< len
; i
++)
1884 /* We're not deferring this any longer. */
1885 DECL_DEFER_OUTPUT (decl
) = 0;
1887 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1888 (*lang_hooks
.finish_incomplete_decl
) (decl
);
1891 /* Now emit any global variables or functions that we have been
1892 putting off. We need to loop in case one of the things emitted
1893 here references another one which comes earlier in the list. */
1897 for (i
= 0; i
< len
; i
++)
1901 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1904 /* Don't write out static consts, unless we still need them.
1906 We also keep static consts if not optimizing (for debugging),
1907 unless the user specified -fno-keep-static-consts.
1908 ??? They might be better written into the debug information.
1909 This is possible when using DWARF.
1911 A language processor that wants static constants to be always
1912 written out (even if it is not used) is responsible for
1913 calling rest_of_decl_compilation itself. E.g. the C front-end
1914 calls rest_of_decl_compilation from finish_decl.
1915 One motivation for this is that is conventional in some
1916 environments to write things like:
1917 static const char rcsid[] = "... version string ...";
1918 intending to force the string to be in the executable.
1920 A language processor that would prefer to have unneeded
1921 static constants "optimized away" would just defer writing
1922 them out until here. E.g. C++ does this, because static
1923 constants are often defined in header files.
1925 ??? A tempting alternative (for both C and C++) would be
1926 to force a constant to be written if and only if it is
1927 defined in a main file, as opposed to an include file. */
1929 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1933 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1935 else if (DECL_COMDAT (decl
))
1937 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1938 && (optimize
|| !flag_keep_static_consts
1939 || DECL_ARTIFICIAL (decl
)))
1945 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1949 if (TREE_CODE (decl
) == FUNCTION_DECL
1950 && DECL_INITIAL (decl
) != 0
1951 && DECL_SAVED_INSNS (decl
) != 0
1952 && (flag_keep_inline_functions
1953 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1954 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1957 output_inline_function (decl
);
1962 output_something
= 1;
1966 return output_something
;
1969 /* Issue appropriate warnings for the global declarations in VEC (of
1970 which there are LEN). Output debugging information for them. */
1973 check_global_declarations (vec
, len
)
1980 for (i
= 0; i
< len
; i
++)
1984 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1985 && ! TREE_ASM_WRITTEN (decl
))
1986 /* Cancel the RTL for this decl so that, if debugging info
1987 output for global variables is still to come,
1988 this one will be omitted. */
1989 SET_DECL_RTL (decl
, NULL_RTX
);
1991 /* Warn about any function
1992 declared static but not defined.
1993 We don't warn about variables,
1994 because many programs have static variables
1995 that exist only to get some text into the object file. */
1996 if (TREE_CODE (decl
) == FUNCTION_DECL
1997 && (warn_unused_function
1998 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1999 && DECL_INITIAL (decl
) == 0
2000 && DECL_EXTERNAL (decl
)
2001 && ! DECL_ARTIFICIAL (decl
)
2002 && ! TREE_PUBLIC (decl
))
2004 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2005 pedwarn_with_decl (decl
,
2006 "`%s' used but never defined");
2008 warning_with_decl (decl
,
2009 "`%s' declared `static' but never defined");
2010 /* This symbol is effectively an "extern" declaration now. */
2011 TREE_PUBLIC (decl
) = 1;
2012 assemble_external (decl
);
2015 /* Warn about static fns or vars defined but not used. */
2016 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
2017 || (warn_unused_variable
&& TREE_CODE (decl
) == VAR_DECL
))
2018 && ! TREE_USED (decl
)
2019 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2020 to handle multiple external decls in different scopes. */
2021 && ! TREE_USED (DECL_NAME (decl
))
2022 && ! DECL_EXTERNAL (decl
)
2023 && ! TREE_PUBLIC (decl
)
2024 /* Global register variables must be declared to reserve them. */
2025 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
2026 /* Otherwise, ask the language. */
2027 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
2028 warning_with_decl (decl
, "`%s' defined but not used");
2030 timevar_push (TV_SYMOUT
);
2031 (*debug_hooks
->global_decl
) (decl
);
2032 timevar_pop (TV_SYMOUT
);
2036 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2037 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2038 INPUT_FILENAME and LINENO accordingly. */
2041 push_srcloc (file
, line
)
2045 struct file_stack
*fs
;
2047 if (input_file_stack
)
2049 input_file_stack
->name
= input_filename
;
2050 input_file_stack
->line
= lineno
;
2053 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2054 fs
->name
= input_filename
= file
;
2055 fs
->line
= lineno
= line
;
2056 fs
->next
= input_file_stack
;
2057 input_file_stack
= fs
;
2058 input_file_stack_tick
++;
2061 /* Pop the top entry off the stack of presently open source files.
2062 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2068 struct file_stack
*fs
;
2070 fs
= input_file_stack
;
2071 input_file_stack
= fs
->next
;
2073 input_file_stack_tick
++;
2074 /* The initial source file is never popped. */
2075 if (!input_file_stack
)
2077 input_filename
= input_file_stack
->name
;
2078 lineno
= input_file_stack
->line
;
2081 /* Compile an entire translation unit. Write a file of assembly
2082 output and various debugging dumps. */
2089 /* Initialize yet another pass. */
2091 init_final (main_input_filename
);
2092 init_branch_prob (dump_base_name
);
2094 timevar_push (TV_PARSE
);
2096 /* Call the parser, which parses the entire file (calling
2097 rest_of_compilation for each function). */
2098 (*lang_hooks
.parse_file
) (set_yydebug
);
2100 /* In case there were missing block closers,
2101 get us back to the global binding level. */
2102 (*lang_hooks
.clear_binding_stack
) ();
2104 /* Compilation is now finished except for writing
2105 what's left of the symbol table output. */
2106 timevar_pop (TV_PARSE
);
2108 if (flag_syntax_only
)
2111 globals
= (*lang_hooks
.decls
.getdecls
) ();
2113 /* Really define vars that have had only a tentative definition.
2114 Really output inline functions that must actually be callable
2115 and have not been output so far. */
2118 int len
= list_length (globals
);
2119 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2123 /* Process the decls in reverse order--earliest first.
2124 Put them into VEC from back to front, then take out from front. */
2126 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2127 vec
[len
- i
- 1] = decl
;
2129 wrapup_global_declarations (vec
, len
);
2131 /* This must occur after the loop to output deferred functions. Else
2132 the profiler initializer would not be emitted if all the functions
2133 in this compilation unit were deferred.
2135 output_func_start_profiler can not cause any additional functions or
2136 data to need to be output, so it need not be in the deferred function
2138 output_func_start_profiler ();
2140 check_global_declarations (vec
, len
);
2146 /* Write out any pending weak symbol declarations. */
2150 /* Do dbx symbols. */
2151 timevar_push (TV_SYMOUT
);
2153 #ifdef DWARF2_UNWIND_INFO
2154 if (dwarf2out_do_frame ())
2155 dwarf2out_frame_finish ();
2158 (*debug_hooks
->finish
) (main_input_filename
);
2159 timevar_pop (TV_SYMOUT
);
2161 /* Output some stuff at end of file if nec. */
2163 dw2_output_indirect_constants ();
2165 end_final (dump_base_name
);
2167 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2169 timevar_push (TV_DUMP
);
2170 open_dump_file (DFI_bp
, NULL
);
2174 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2175 timevar_pop (TV_DUMP
);
2179 ASM_FILE_END (asm_out_file
);
2182 /* Attach a special .ident directive to the end of the file to identify
2183 the version of GCC which compiled this code. The format of the .ident
2184 string is patterned after the ones produced by native SVR4 compilers. */
2187 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2188 IDENT_ASM_OP
, version_string
);
2191 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2193 timevar_push (TV_DUMP
);
2194 dump_combine_total_stats (rtl_dump_file
);
2195 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2196 timevar_pop (TV_DUMP
);
2200 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2201 and TYPE_DECL nodes.
2203 This does nothing for local (non-static) variables, unless the
2204 variable is a register variable with an ASMSPEC. In that case, or
2205 if the variable is not an automatic, it sets up the RTL and
2206 outputs any assembler code (label definition, storage allocation
2207 and initialization).
2209 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2210 the assembler symbol name to be used. TOP_LEVEL is nonzero
2211 if this declaration is not within a function. */
2214 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2216 const char *asmspec
;
2220 /* Declarations of variables, and of functions defined elsewhere. */
2222 /* The most obvious approach, to put an #ifndef around where
2223 this macro is used, doesn't work since it's inside a macro call. */
2224 #ifndef ASM_FINISH_DECLARE_OBJECT
2225 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2228 /* We deferred calling assemble_alias so that we could collect
2229 other attributes such as visibility. Emit the alias now. */
2232 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
2235 alias
= TREE_VALUE (TREE_VALUE (alias
));
2236 alias
= get_identifier (TREE_STRING_POINTER (alias
));
2237 assemble_alias (decl
, alias
);
2241 /* Forward declarations for nested functions are not "external",
2242 but we need to treat them as if they were. */
2243 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2244 || TREE_CODE (decl
) == FUNCTION_DECL
)
2246 timevar_push (TV_VARCONST
);
2249 make_decl_rtl (decl
, asmspec
);
2251 /* Don't output anything when a tentative file-scope definition
2252 is seen. But at end of compilation, do output code for them. */
2253 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2254 assemble_variable (decl
, top_level
, at_end
, 0);
2255 if (decl
== last_assemble_variable_decl
)
2257 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2261 timevar_pop (TV_VARCONST
);
2263 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2265 if (decode_reg_name (asmspec
) >= 0)
2267 SET_DECL_RTL (decl
, NULL_RTX
);
2268 make_decl_rtl (decl
, asmspec
);
2272 error ("invalid register name `%s' for register variable", asmspec
);
2273 DECL_REGISTER (decl
) = 0;
2278 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2279 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2280 && TREE_CODE (decl
) == TYPE_DECL
)
2282 timevar_push (TV_SYMOUT
);
2283 dbxout_symbol (decl
, 0);
2284 timevar_pop (TV_SYMOUT
);
2287 #ifdef SDB_DEBUGGING_INFO
2288 else if (write_symbols
== SDB_DEBUG
&& top_level
2289 && TREE_CODE (decl
) == TYPE_DECL
)
2291 timevar_push (TV_SYMOUT
);
2292 sdbout_symbol (decl
, 0);
2293 timevar_pop (TV_SYMOUT
);
2298 /* Called after finishing a record, union or enumeral type. */
2301 rest_of_type_compilation (type
, toplev
)
2302 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2306 tree type ATTRIBUTE_UNUSED
;
2307 int toplev ATTRIBUTE_UNUSED
;
2310 timevar_push (TV_SYMOUT
);
2311 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2312 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2313 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2315 #ifdef SDB_DEBUGGING_INFO
2316 if (write_symbols
== SDB_DEBUG
)
2317 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2319 #ifdef DWARF2_DEBUGGING_INFO
2320 if ((write_symbols
== DWARF2_DEBUG
2321 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
2323 dwarf2out_decl (TYPE_STUB_DECL (type
));
2325 timevar_pop (TV_SYMOUT
);
2328 /* This is called from finish_function (within langhooks.parse_file)
2329 after each top-level definition is parsed.
2330 It is supposed to compile that function or variable
2331 and output the assembler code for it.
2332 After we return, the tree storage is freed. */
2335 rest_of_compilation (decl
)
2341 int rebuild_label_notes_after_reload
;
2342 int register_life_up_to_date
;
2344 timevar_push (TV_REST_OF_COMPILATION
);
2346 /* Now that we're out of the frontend, we shouldn't have any more
2347 CONCATs anywhere. */
2348 generating_concat_p
= 0;
2350 /* When processing delayed functions, prepare_function_start() won't
2351 have been run to re-initialize it. */
2352 cse_not_expected
= ! optimize
;
2354 /* First, make sure that NOTE_BLOCK is set correctly for each
2355 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2356 if (!cfun
->x_whole_function_mode_p
)
2359 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2360 tree in sensible shape. So, we just recalculate it here. */
2361 if (cfun
->x_whole_function_mode_p
)
2366 /* If we are reconsidering an inline function
2367 at the end of compilation, skip the stuff for making it inline. */
2369 if (DECL_SAVED_INSNS (decl
) == 0)
2375 /* If this is nested inside an inlined external function, pretend
2376 it was only declared. Since we cannot inline such functions,
2377 generating code for this one is not only not necessary but will
2378 confuse some debugging output writers. */
2379 for (parent
= DECL_CONTEXT (current_function_decl
);
2380 parent
!= NULL_TREE
;
2381 parent
= get_containing_scope (parent
))
2382 if (TREE_CODE (parent
) == FUNCTION_DECL
2383 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2385 DECL_INITIAL (decl
) = 0;
2386 goto exit_rest_of_compilation
;
2389 /* If requested, consider whether to make this function inline. */
2390 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2391 || flag_inline_functions
)
2393 timevar_push (TV_INTEGRATION
);
2394 lose
= function_cannot_inline_p (decl
);
2395 timevar_pop (TV_INTEGRATION
);
2396 if (lose
|| ! optimize
)
2398 if (warn_inline
&& DECL_INLINE (decl
))
2399 warning_with_decl (decl
, lose
);
2400 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2401 /* Don't really compile an extern inline function.
2402 If we can't make it inline, pretend
2403 it was only declared. */
2404 if (DECL_EXTERNAL (decl
))
2406 DECL_INITIAL (decl
) = 0;
2407 goto exit_rest_of_compilation
;
2411 /* ??? Note that this has the effect of making it look
2412 like "inline" was specified for a function if we choose
2413 to inline it. This isn't quite right, but it's
2414 probably not worth the trouble to fix. */
2415 inlinable
= DECL_INLINE (decl
) = 1;
2418 insns
= get_insns ();
2420 /* Dump the rtl code if we are dumping rtl. */
2422 if (open_dump_file (DFI_rtl
, decl
))
2424 if (DECL_SAVED_INSNS (decl
))
2425 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2426 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2429 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2430 sorts of eh initialization. Delay this until after the
2431 initial rtl dump so that we can see the original nesting. */
2432 convert_from_eh_region_ranges ();
2434 /* If function is inline, and we don't yet know whether to
2435 compile it by itself, defer decision till end of compilation.
2436 finish_compilation will call rest_of_compilation again
2437 for those functions that need to be output. Also defer those
2438 functions that we are supposed to defer. */
2441 || (DECL_INLINE (decl
)
2442 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2443 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2444 && ! flag_keep_inline_functions
)
2445 || DECL_EXTERNAL (decl
))))
2446 DECL_DEFER_OUTPUT (decl
) = 1;
2448 if (DECL_INLINE (decl
))
2449 /* DWARF wants separate debugging info for abstract and
2450 concrete instances of all inline functions, including those
2451 declared inline but not inlined, and those inlined even
2452 though they weren't declared inline. Conveniently, that's
2453 what DECL_INLINE means at this point. */
2454 (*debug_hooks
->deferred_inline_function
) (decl
);
2456 if (DECL_DEFER_OUTPUT (decl
))
2458 /* If -Wreturn-type, we have to do a bit of compilation. We just
2459 want to call cleanup the cfg to figure out whether or not we can
2460 fall off the end of the function; we do the minimum amount of
2461 work necessary to make that safe. */
2462 if (warn_return_type
)
2464 int saved_optimize
= optimize
;
2467 rebuild_jump_labels (insns
);
2468 find_exception_handler_labels ();
2469 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2470 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2471 optimize
= saved_optimize
;
2473 /* CFG is no longer maintained up-to-date. */
2474 free_bb_for_insn ();
2477 current_function_nothrow
= nothrow_function_p ();
2478 if (current_function_nothrow
)
2479 /* Now we know that this can't throw; set the flag for the benefit
2480 of other functions later in this translation unit. */
2481 TREE_NOTHROW (current_function_decl
) = 1;
2483 timevar_push (TV_INTEGRATION
);
2484 save_for_inline (decl
);
2485 timevar_pop (TV_INTEGRATION
);
2486 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2487 goto exit_rest_of_compilation
;
2490 /* If specified extern inline but we aren't inlining it, we are
2491 done. This goes for anything that gets here with DECL_EXTERNAL
2492 set, not just things with DECL_INLINE. */
2493 if (DECL_EXTERNAL (decl
))
2494 goto exit_rest_of_compilation
;
2497 /* If we're emitting a nested function, make sure its parent gets
2498 emitted as well. Doing otherwise confuses debug info. */
2501 for (parent
= DECL_CONTEXT (current_function_decl
);
2502 parent
!= NULL_TREE
;
2503 parent
= get_containing_scope (parent
))
2504 if (TREE_CODE (parent
) == FUNCTION_DECL
)
2505 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
2508 /* We are now committed to emitting code for this function. Do any
2509 preparation, such as emitting abstract debug info for the inline
2510 before it gets mangled by optimization. */
2511 if (DECL_INLINE (decl
))
2512 (*debug_hooks
->outlining_inline_function
) (decl
);
2514 /* Remove any notes we don't need. That will make iterating
2515 over the instruction sequence faster, and allow the garbage
2516 collector to reclaim the memory used by the notes. */
2517 remove_unnecessary_notes ();
2522 /* Initialize some variables used by the optimizers. */
2523 init_function_for_compilation ();
2525 if (! DECL_DEFER_OUTPUT (decl
))
2526 TREE_ASM_WRITTEN (decl
) = 1;
2528 /* Now that integrate will no longer see our rtl, we need not
2529 distinguish between the return value of this function and the
2530 return value of called functions. Also, we can remove all SETs
2531 of subregs of hard registers; they are only here because of
2532 integrate. Also, we can now initialize pseudos intended to
2533 carry magic hard reg data throughout the function. */
2534 rtx_equal_function_value_matters
= 0;
2535 purge_hard_subreg_sets (get_insns ());
2537 /* Early return if there were errors. We can run afoul of our
2538 consistency checks, and there's not really much point in fixing them.
2539 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2540 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2541 || errorcount
|| sorrycount
)
2542 goto exit_rest_of_compilation
;
2544 timevar_push (TV_JUMP
);
2545 open_dump_file (DFI_sibling
, decl
);
2546 insns
= get_insns ();
2547 rebuild_jump_labels (insns
);
2548 find_exception_handler_labels ();
2549 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2551 delete_unreachable_blocks ();
2553 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2554 note_prediction_to_br_prob ();
2556 /* We may have potential sibling or tail recursion sites. Select one
2557 (of possibly multiple) methods of performing the call. */
2558 if (flag_optimize_sibling_calls
)
2561 optimize_sibling_and_tail_recursive_calls ();
2563 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2564 free_bb_for_insn ();
2565 find_exception_handler_labels ();
2566 rebuild_jump_labels (insns
);
2567 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2569 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2570 notes before simplifying cfg and we must do lowering after sibcall
2571 that unhides parts of RTL chain and cleans up the CFG.
2573 Until sibcall is replaced by tree-level optimizer, lets just
2574 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2575 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2576 if (GET_CODE (insn
) == NOTE
2577 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2580 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2581 timevar_pop (TV_JUMP
);
2583 scope_to_insns_initialize ();
2584 /* Complete generation of exception handling code. */
2587 timevar_push (TV_JUMP
);
2588 open_dump_file (DFI_eh
, decl
);
2590 finish_eh_generation ();
2592 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2593 timevar_pop (TV_JUMP
);
2596 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2597 generation, which might create new sets. */
2598 emit_initial_value_sets ();
2601 /* If we are doing position-independent code generation, now
2602 is the time to output special prologues and epilogues.
2603 We do not want to do this earlier, because it just clutters
2604 up inline functions with meaningless insns. */
2609 insns
= get_insns ();
2611 /* Copy any shared structure that should not be shared. */
2612 unshare_all_rtl (current_function_decl
, insns
);
2614 #ifdef SETJMP_VIA_SAVE_AREA
2615 /* This must be performed before virtual register instantiation.
2616 Please be aware the everything in the compiler that can look
2617 at the RTL up to this point must understand that REG_SAVE_AREA
2618 is just like a use of the REG contained inside. */
2619 if (current_function_calls_alloca
)
2620 optimize_save_area_alloca (insns
);
2623 /* Instantiate all virtual registers. */
2624 instantiate_virtual_regs (current_function_decl
, insns
);
2626 open_dump_file (DFI_jump
, decl
);
2628 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2629 are initialized and to compute whether control can drop off the end
2632 timevar_push (TV_JUMP
);
2633 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2634 before jump optimization switches branch directions. */
2635 expected_value_to_br_prob ();
2637 reg_scan (insns
, max_reg_num (), 0);
2638 rebuild_jump_labels (insns
);
2639 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2641 dump_flow_info (rtl_dump_file
);
2642 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
2643 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2645 /* CFG is no longer maintained up-to-date. */
2646 free_bb_for_insn ();
2647 copy_loop_headers (insns
);
2648 purge_line_number_notes (insns
);
2650 timevar_pop (TV_JUMP
);
2651 close_dump_file (DFI_jump
, print_rtl
, insns
);
2653 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2654 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2656 goto exit_rest_of_compilation
;
2659 /* Long term, this should probably move before the jump optimizer too,
2660 but I didn't want to disturb the rtl_dump_and_exit and related
2661 stuff at this time. */
2662 if (optimize
> 0 && flag_ssa
)
2664 /* Convert to SSA form. */
2666 timevar_push (TV_TO_SSA
);
2667 open_dump_file (DFI_ssa
, decl
);
2669 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2670 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2673 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2674 timevar_pop (TV_TO_SSA
);
2676 /* Perform sparse conditional constant propagation, if requested. */
2679 timevar_push (TV_SSA_CCP
);
2680 open_dump_file (DFI_ssa_ccp
, decl
);
2684 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2685 timevar_pop (TV_SSA_CCP
);
2688 /* It would be useful to cleanup the CFG at this point, but block
2689 merging and possibly other transformations might leave a PHI
2690 node in the middle of a basic block, which is a strict no-no. */
2692 /* The SSA implementation uses basic block numbers in its phi
2693 nodes. Thus, changing the control-flow graph or the basic
2694 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2695 may cause problems. */
2699 /* Remove dead code. */
2701 timevar_push (TV_SSA_DCE
);
2702 open_dump_file (DFI_ssa_dce
, decl
);
2704 insns
= get_insns ();
2705 ssa_eliminate_dead_code ();
2707 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2708 timevar_pop (TV_SSA_DCE
);
2711 /* Convert from SSA form. */
2713 timevar_push (TV_FROM_SSA
);
2714 open_dump_file (DFI_ussa
, decl
);
2716 convert_from_ssa ();
2717 /* New registers have been created. Rescan their usage. */
2718 reg_scan (insns
, max_reg_num (), 1);
2720 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2721 timevar_pop (TV_FROM_SSA
);
2724 /* CFG is no longer maintained up-to-date. */
2725 free_bb_for_insn ();
2728 timevar_push (TV_JUMP
);
2730 if (flag_delete_null_pointer_checks
|| flag_if_conversion
)
2732 open_dump_file (DFI_null
, decl
);
2733 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2735 dump_flow_info (rtl_dump_file
);
2736 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2738 /* Try to identify useless null pointer tests and delete them. */
2739 if (flag_delete_null_pointer_checks
)
2740 delete_null_pointer_checks (insns
);
2742 timevar_push (TV_IFCVT
);
2743 if (flag_if_conversion
)
2745 timevar_pop (TV_IFCVT
);
2746 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2747 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2750 /* Jump optimization, and the removal of NULL pointer checks, may
2751 have reduced the number of instructions substantially. CSE, and
2752 future passes, allocate arrays whose dimensions involve the
2753 maximum instruction UID, so if we can reduce the maximum UID
2754 we'll save big on memory. */
2755 renumber_insns (rtl_dump_file
);
2757 compute_bb_for_insn (get_max_uid ());
2758 timevar_pop (TV_JUMP
);
2760 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
2764 /* Perform common subexpression elimination.
2765 Nonzero value from `cse_main' means that jumps were simplified
2766 and some code may now be unreachable, so do
2767 jump optimization again. */
2771 open_dump_file (DFI_cse
, decl
);
2773 dump_flow_info (rtl_dump_file
);
2774 timevar_push (TV_CSE
);
2776 reg_scan (insns
, max_reg_num (), 1);
2778 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2780 rebuild_jump_labels (insns
);
2781 purge_all_dead_edges (0);
2783 delete_trivially_dead_insns (insns
, max_reg_num ());
2785 /* If we are not running more CSE passes, then we are no longer
2786 expecting CSE to be run. But always rerun it in a cheap mode. */
2787 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2789 if (tem
|| optimize
> 1)
2790 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2791 /* Try to identify useless null pointer tests and delete them. */
2792 if (flag_delete_null_pointer_checks
|| flag_thread_jumps
)
2794 timevar_push (TV_JUMP
);
2796 if (flag_delete_null_pointer_checks
)
2797 delete_null_pointer_checks (insns
);
2798 /* CFG is no longer maintained up-to-date. */
2799 timevar_pop (TV_JUMP
);
2802 /* The second pass of jump optimization is likely to have
2803 removed a bunch more instructions. */
2804 renumber_insns (rtl_dump_file
);
2805 compute_bb_for_insn (get_max_uid ());
2807 timevar_pop (TV_CSE
);
2808 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2811 open_dump_file (DFI_addressof
, decl
);
2813 purge_addressof (insns
);
2815 purge_all_dead_edges (0);
2816 reg_scan (insns
, max_reg_num (), 1);
2818 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2822 /* Perform global cse. */
2824 if (optimize
> 0 && flag_gcse
)
2826 int save_csb
, save_cfj
;
2829 timevar_push (TV_GCSE
);
2830 open_dump_file (DFI_gcse
, decl
);
2832 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2833 tem
= gcse_main (insns
, rtl_dump_file
);
2834 rebuild_jump_labels (insns
);
2835 delete_trivially_dead_insns (insns
, max_reg_num ());
2837 save_csb
= flag_cse_skip_blocks
;
2838 save_cfj
= flag_cse_follow_jumps
;
2839 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2841 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2843 if (flag_expensive_optimizations
)
2845 timevar_push (TV_CSE
);
2846 reg_scan (insns
, max_reg_num (), 1);
2847 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2848 purge_all_dead_edges (0);
2849 delete_trivially_dead_insns (insns
, max_reg_num ());
2850 timevar_pop (TV_CSE
);
2851 cse_not_expected
= !flag_rerun_cse_after_loop
;
2854 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2855 things up. Then possibly re-run CSE again. */
2859 timevar_push (TV_JUMP
);
2860 rebuild_jump_labels (insns
);
2861 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2862 timevar_pop (TV_JUMP
);
2864 if (flag_expensive_optimizations
)
2866 timevar_push (TV_CSE
);
2867 reg_scan (insns
, max_reg_num (), 1);
2868 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2869 purge_all_dead_edges (0);
2870 delete_trivially_dead_insns (insns
, max_reg_num ());
2871 timevar_pop (TV_CSE
);
2875 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2876 timevar_pop (TV_GCSE
);
2879 flag_cse_skip_blocks
= save_csb
;
2880 flag_cse_follow_jumps
= save_cfj
;
2881 #ifdef ENABLE_CHECKING
2882 verify_flow_info ();
2886 /* Move constant computations out of loops. */
2888 if (optimize
> 0 && flag_loop_optimize
)
2890 timevar_push (TV_LOOP
);
2891 delete_dead_jumptables ();
2892 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2893 open_dump_file (DFI_loop
, decl
);
2894 /* CFG is no longer maintained up-to-date. */
2895 free_bb_for_insn ();
2897 if (flag_rerun_loop_opt
)
2899 cleanup_barriers ();
2901 /* We only want to perform unrolling once. */
2902 loop_optimize (insns
, rtl_dump_file
, LOOP_FIRST_PASS
);
2904 /* The first call to loop_optimize makes some instructions
2905 trivially dead. We delete those instructions now in the
2906 hope that doing so will make the heuristics in loop work
2907 better and possibly speed up compilation. */
2908 delete_trivially_dead_insns (insns
, max_reg_num ());
2910 /* The regscan pass is currently necessary as the alias
2911 analysis code depends on this information. */
2912 reg_scan (insns
, max_reg_num (), 1);
2914 cleanup_barriers ();
2915 loop_optimize (insns
, rtl_dump_file
,
2916 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
2917 | (flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0));
2919 /* Loop can create trivially dead instructions. */
2920 delete_trivially_dead_insns (insns
, max_reg_num ());
2921 close_dump_file (DFI_loop
, print_rtl
, insns
);
2922 timevar_pop (TV_LOOP
);
2927 /* Do control and data flow analysis; wrote some of the results to
2930 timevar_push (TV_FLOW
);
2931 open_dump_file (DFI_cfg
, decl
);
2933 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2935 dump_flow_info (rtl_dump_file
);
2936 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0)
2937 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2939 /* It may make more sense to mark constant functions after dead code is
2940 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2941 may insert code making function non-constant, but we still must consider
2942 it as constant, otherwise -fbranch-probabilities will not read data back.
2944 life_analyzis rarely eliminates modification of external memory.
2947 mark_constant_function ();
2949 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2951 /* Do branch profiling and static profile estimation passes. */
2952 if (optimize
> 0 || cfun
->arc_profile
|| flag_branch_probabilities
)
2956 timevar_push (TV_BRANCH_PROB
);
2957 open_dump_file (DFI_bp
, decl
);
2958 if (cfun
->arc_profile
|| flag_branch_probabilities
)
2961 /* Discover and record the loop depth at the head of each basic
2962 block. The loop infrastructure does the real job for us. */
2963 flow_loops_find (&loops
, LOOP_TREE
);
2965 /* Estimate using heuristics if no profiling info is available. */
2966 if (flag_guess_branch_prob
)
2967 estimate_probability (&loops
);
2970 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2972 flow_loops_free (&loops
);
2973 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2974 timevar_pop (TV_BRANCH_PROB
);
2978 timevar_push (TV_TRACER
);
2979 open_dump_file (DFI_tracer
, decl
);
2981 dump_flow_info (rtl_dump_file
);
2982 cleanup_cfg (CLEANUP_EXPENSIVE
);
2984 cleanup_cfg (CLEANUP_EXPENSIVE
);
2985 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
2986 timevar_pop (TV_TRACER
);
2987 reg_scan (get_insns (), max_reg_num (), 0);
2992 timevar_push (TV_CSE2
);
2993 open_dump_file (DFI_cse2
, decl
);
2995 dump_flow_info (rtl_dump_file
);
2997 if (flag_rerun_cse_after_loop
)
2999 timevar_push (TV_JUMP
);
3001 reg_scan (insns
, max_reg_num (), 0);
3003 timevar_push (TV_IFCVT
);
3004 cleanup_cfg (CLEANUP_EXPENSIVE
);
3005 if (flag_if_conversion
)
3007 timevar_pop (TV_IFCVT
);
3009 timevar_pop (TV_JUMP
);
3010 /* CFG is no longer maintained up-to-date. */
3011 reg_scan (insns
, max_reg_num (), 0);
3012 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3013 purge_all_dead_edges (0);
3014 delete_trivially_dead_insns (insns
, max_reg_num ());
3018 timevar_push (TV_JUMP
);
3019 rebuild_jump_labels (insns
);
3020 cleanup_cfg (CLEANUP_EXPENSIVE
);
3021 timevar_pop (TV_JUMP
);
3025 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
3026 timevar_pop (TV_CSE2
);
3031 cse_not_expected
= 1;
3033 open_dump_file (DFI_life
, decl
);
3036 check_function_return_warnings ();
3038 #ifdef ENABLE_CHECKING
3039 verify_flow_info ();
3041 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3043 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
3044 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3045 timevar_pop (TV_FLOW
);
3049 if (warn_uninitialized
|| extra_warnings
)
3051 uninitialized_vars_warning (DECL_INITIAL (decl
));
3053 setjmp_args_warning ();
3059 if (initialize_uninitialized_subregs ())
3061 /* Insns were inserted, so things might look a bit different. */
3062 insns
= get_insns ();
3063 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES
,
3064 PROP_LOG_LINKS
| PROP_REG_INFO
3065 | PROP_DEATH_NOTES
);
3069 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3073 /* If -opt, try combining insns through substitution. */
3077 int rebuild_jump_labels_after_combine
= 0;
3079 timevar_push (TV_COMBINE
);
3080 open_dump_file (DFI_combine
, decl
);
3082 rebuild_jump_labels_after_combine
3083 = combine_instructions (insns
, max_reg_num ());
3085 /* Combining insns may have turned an indirect jump into a
3086 direct jump. Rebuid the JUMP_LABEL fields of jumping
3088 if (rebuild_jump_labels_after_combine
)
3090 timevar_push (TV_JUMP
);
3091 rebuild_jump_labels (insns
);
3092 timevar_pop (TV_JUMP
);
3094 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3097 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3098 timevar_pop (TV_COMBINE
);
3103 /* Rerun if-conversion, as combine may have simplified things enough to
3104 now meet sequence length restrictions. */
3105 if (flag_if_conversion
)
3107 timevar_push (TV_IFCVT
);
3108 open_dump_file (DFI_ce
, decl
);
3114 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3115 timevar_pop (TV_IFCVT
);
3118 /* Register allocation pre-pass, to reduce number of moves
3119 necessary for two-address machines. */
3120 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3122 timevar_push (TV_REGMOVE
);
3123 open_dump_file (DFI_regmove
, decl
);
3125 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3127 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
3128 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3129 timevar_pop (TV_REGMOVE
);
3134 /* Do unconditional splitting before register allocation to allow machine
3135 description to add extra information not needed previously. */
3136 split_all_insns (1);
3138 /* Any of the several passes since flow1 will have munged register
3139 lifetime data a bit. */
3140 register_life_up_to_date
= 0;
3142 #ifdef OPTIMIZE_MODE_SWITCHING
3143 timevar_push (TV_MODE_SWITCH
);
3146 optimize_mode_switching (NULL
);
3149 timevar_pop (TV_MODE_SWITCH
);
3152 timevar_push (TV_SCHED
);
3154 #ifdef INSN_SCHEDULING
3156 /* Print function header into sched dump now
3157 because doing the sched analysis makes some of the dump. */
3158 if (optimize
> 0 && flag_schedule_insns
)
3160 open_dump_file (DFI_sched
, decl
);
3162 /* Do control and data sched analysis,
3163 and write some of the results to dump file. */
3165 schedule_insns (rtl_dump_file
);
3167 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3169 /* Register lifetime information was updated as part of verifying
3171 register_life_up_to_date
= 1;
3174 timevar_pop (TV_SCHED
);
3178 /* Determine if the current function is a leaf before running reload
3179 since this can impact optimizations done by the prologue and
3180 epilogue thus changing register elimination offsets. */
3181 current_function_is_leaf
= leaf_function_p ();
3183 timevar_push (TV_LOCAL_ALLOC
);
3184 open_dump_file (DFI_lreg
, decl
);
3186 /* Allocate pseudo-regs that are used only within 1 basic block.
3188 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3189 jump optimizer after register allocation and reloading are finished. */
3191 if (! register_life_up_to_date
)
3192 recompute_reg_usage (insns
, ! optimize_size
);
3194 /* Allocate the reg_renumber array. */
3195 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3197 /* And the reg_equiv_memory_loc array. */
3198 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3200 allocate_initial_values (reg_equiv_memory_loc
);
3202 regclass (insns
, max_reg_num (), rtl_dump_file
);
3203 rebuild_label_notes_after_reload
= local_alloc ();
3205 timevar_pop (TV_LOCAL_ALLOC
);
3207 if (dump_file
[DFI_lreg
].enabled
)
3209 timevar_push (TV_DUMP
);
3211 dump_flow_info (rtl_dump_file
);
3212 dump_local_alloc (rtl_dump_file
);
3214 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3215 timevar_pop (TV_DUMP
);
3220 timevar_push (TV_GLOBAL_ALLOC
);
3221 open_dump_file (DFI_greg
, decl
);
3223 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3224 pass fixing up any insns that are invalid. */
3227 failure
= global_alloc (rtl_dump_file
);
3230 build_insn_chain (insns
);
3231 failure
= reload (insns
, 0);
3234 timevar_pop (TV_GLOBAL_ALLOC
);
3236 if (dump_file
[DFI_greg
].enabled
)
3238 timevar_push (TV_DUMP
);
3240 dump_global_regs (rtl_dump_file
);
3242 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3243 timevar_pop (TV_DUMP
);
3247 goto exit_rest_of_compilation
;
3251 open_dump_file (DFI_postreload
, decl
);
3253 /* Do a very simple CSE pass over just the hard registers. */
3256 timevar_push (TV_RELOAD_CSE_REGS
);
3257 reload_cse_regs (insns
);
3258 timevar_pop (TV_RELOAD_CSE_REGS
);
3261 /* Register allocation and reloading may have turned an indirect jump into
3262 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3263 jumping instructions. */
3264 if (rebuild_label_notes_after_reload
)
3266 timevar_push (TV_JUMP
);
3268 rebuild_jump_labels (insns
);
3269 purge_all_dead_edges (0);
3271 timevar_pop (TV_JUMP
);
3274 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3276 /* Re-create the death notes which were deleted during reload. */
3277 timevar_push (TV_FLOW2
);
3278 open_dump_file (DFI_flow2
, decl
);
3280 #ifdef ENABLE_CHECKING
3281 verify_flow_info ();
3284 /* If optimizing, then go ahead and split insns now. */
3286 split_all_insns (0);
3288 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3290 /* On some machines, the prologue and epilogue code, or parts thereof,
3291 can be represented as RTL. Doing so lets us schedule insns between
3292 it and the rest of the code and also allows delayed branch
3293 scheduling to operate in the epilogue. */
3294 thread_prologue_and_epilogue_insns (insns
);
3298 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3299 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3300 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3302 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3303 even for machines with possibly nonzero RETURN_POPS_ARGS
3304 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3305 push instructions will have popping returns. */
3306 #ifndef PUSH_ROUNDING
3307 if (!ACCUMULATE_OUTGOING_ARGS
)
3309 combine_stack_adjustments ();
3314 flow2_completed
= 1;
3316 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3317 timevar_pop (TV_FLOW2
);
3319 #ifdef HAVE_peephole2
3320 if (optimize
> 0 && flag_peephole2
)
3322 timevar_push (TV_PEEPHOLE2
);
3323 open_dump_file (DFI_peephole2
, decl
);
3325 peephole2_optimize (rtl_dump_file
);
3327 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3328 timevar_pop (TV_PEEPHOLE2
);
3332 if (optimize
> 0 && (flag_rename_registers
|| flag_cprop_registers
))
3334 timevar_push (TV_RENAME_REGISTERS
);
3335 open_dump_file (DFI_rnreg
, decl
);
3337 if (flag_rename_registers
)
3338 regrename_optimize ();
3339 if (flag_cprop_registers
)
3340 copyprop_hardreg_forward ();
3342 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3343 timevar_pop (TV_RENAME_REGISTERS
);
3346 if (flag_if_conversion2
)
3348 timevar_push (TV_IFCVT2
);
3349 open_dump_file (DFI_ce2
, decl
);
3353 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3354 timevar_pop (TV_IFCVT2
);
3358 split_all_insns (1);
3361 #ifdef INSN_SCHEDULING
3362 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3364 timevar_push (TV_SCHED2
);
3365 open_dump_file (DFI_sched2
, decl
);
3367 /* Do control and data sched analysis again,
3368 and write some more of the results to dump file. */
3370 split_all_insns (1);
3372 schedule_insns (rtl_dump_file
);
3374 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3375 timevar_pop (TV_SCHED2
);
3381 #ifdef LEAF_REGISTERS
3382 current_function_uses_only_leaf_regs
3383 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3387 timevar_push (TV_REG_STACK
);
3388 open_dump_file (DFI_stack
, decl
);
3390 reg_to_stack (insns
, rtl_dump_file
);
3392 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3393 timevar_pop (TV_REG_STACK
);
3399 timevar_push (TV_REORDER_BLOCKS
);
3400 open_dump_file (DFI_bbro
, decl
);
3402 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3403 splitting possibly introduced more crossjumping oppurtuntities.
3404 Except that we can't actually run crossjumping without running
3405 another DCE pass, which we can't do after reg-stack. */
3406 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3407 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3408 if (flag_reorder_blocks
)
3410 reorder_basic_blocks ();
3411 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3414 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3415 timevar_pop (TV_REORDER_BLOCKS
);
3417 compute_alignments ();
3419 /* CFG is no longer maintained up-to-date. */
3420 free_bb_for_insn ();
3422 /* If a machine dependent reorganization is needed, call it. */
3423 #ifdef MACHINE_DEPENDENT_REORG
3424 timevar_push (TV_MACH_DEP
);
3425 open_dump_file (DFI_mach
, decl
);
3427 MACHINE_DEPENDENT_REORG (insns
);
3429 close_dump_file (DFI_mach
, print_rtl
, insns
);
3430 timevar_pop (TV_MACH_DEP
);
3435 purge_line_number_notes (insns
);
3436 cleanup_barriers ();
3438 /* If a scheduling pass for delayed branches is to be done,
3439 call the scheduling code. */
3442 if (optimize
> 0 && flag_delayed_branch
)
3444 timevar_push (TV_DBR_SCHED
);
3445 open_dump_file (DFI_dbr
, decl
);
3447 dbr_schedule (insns
, rtl_dump_file
);
3449 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3450 timevar_pop (TV_DBR_SCHED
);
3456 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3457 timevar_push (TV_SHORTEN_BRANCH
);
3458 split_all_insns_noflow ();
3459 timevar_pop (TV_SHORTEN_BRANCH
);
3462 convert_to_eh_region_ranges ();
3464 /* Shorten branches. */
3465 timevar_push (TV_SHORTEN_BRANCH
);
3466 shorten_branches (get_insns ());
3467 timevar_pop (TV_SHORTEN_BRANCH
);
3469 current_function_nothrow
= nothrow_function_p ();
3470 if (current_function_nothrow
)
3471 /* Now we know that this can't throw; set the flag for the benefit
3472 of other functions later in this translation unit. */
3473 TREE_NOTHROW (current_function_decl
) = 1;
3475 /* Now turn the rtl into assembler code. */
3477 timevar_push (TV_FINAL
);
3482 /* Get the function's name, as described by its RTL. This may be
3483 different from the DECL_NAME name used in the source file. */
3485 x
= DECL_RTL (decl
);
3486 if (GET_CODE (x
) != MEM
)
3489 if (GET_CODE (x
) != SYMBOL_REF
)
3491 fnname
= XSTR (x
, 0);
3493 assemble_start_function (decl
, fnname
);
3494 final_start_function (insns
, asm_out_file
, optimize
);
3495 final (insns
, asm_out_file
, optimize
, 0);
3496 final_end_function ();
3498 #ifdef IA64_UNWIND_INFO
3499 /* ??? The IA-64 ".handlerdata" directive must be issued before
3500 the ".endp" directive that closes the procedure descriptor. */
3501 output_function_exception_table ();
3504 assemble_end_function (decl
, fnname
);
3506 #ifndef IA64_UNWIND_INFO
3507 /* Otherwise, it feels unclean to switch sections in the middle. */
3508 output_function_exception_table ();
3512 fflush (asm_out_file
);
3514 /* Release all memory allocated by flow. */
3515 free_basic_block_vars (0);
3517 /* Release all memory held by regsets now. */
3518 regset_release_memory ();
3520 timevar_pop (TV_FINAL
);
3524 /* Write DBX symbols if requested. */
3526 /* Note that for those inline functions where we don't initially
3527 know for certain that we will be generating an out-of-line copy,
3528 the first invocation of this routine (rest_of_compilation) will
3529 skip over this code by doing a `goto exit_rest_of_compilation;'.
3530 Later on, finish_compilation will call rest_of_compilation again
3531 for those inline functions that need to have out-of-line copies
3532 generated. During that call, we *will* be routed past here. */
3534 timevar_push (TV_SYMOUT
);
3535 (*debug_hooks
->function_decl
) (decl
);
3536 timevar_pop (TV_SYMOUT
);
3538 exit_rest_of_compilation
:
3540 /* In case the function was not output,
3541 don't leave any temporary anonymous types
3542 queued up for sdb output. */
3543 #ifdef SDB_DEBUGGING_INFO
3544 if (write_symbols
== SDB_DEBUG
)
3545 sdbout_types (NULL_TREE
);
3548 reload_completed
= 0;
3549 flow2_completed
= 0;
3552 timevar_push (TV_FINAL
);
3554 /* Clear out the insn_length contents now that they are no
3556 init_insn_lengths ();
3558 /* Show no temporary slots allocated. */
3561 free_basic_block_vars (0);
3562 free_bb_for_insn ();
3564 timevar_pop (TV_FINAL
);
3566 /* Make sure volatile mem refs aren't considered valid operands for
3567 arithmetic insns. We must call this here if this is a nested inline
3568 function, since the above code leaves us in the init_recog state
3569 (from final.c), and the function context push/pop code does not
3570 save/restore volatile_ok.
3572 ??? Maybe it isn't necessary for expand_start_function to call this
3573 anymore if we do it here? */
3575 init_recog_no_volatile ();
3577 /* We're done with this function. Free up memory if we can. */
3578 free_after_parsing (cfun
);
3579 if (! DECL_DEFER_OUTPUT (decl
))
3581 free_after_compilation (cfun
);
3583 /* Clear integrate.c's pointer to the cfun structure we just
3585 DECL_SAVED_INSNS (decl
) = 0;
3591 timevar_pop (TV_REST_OF_COMPILATION
);
3601 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3602 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3603 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3604 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3605 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3606 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"));
3607 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3609 for (i
= ARRAY_SIZE (f_options
); i
--;)
3611 const char *description
= f_options
[i
].description
;
3613 if (description
!= NULL
&& *description
!= 0)
3614 printf (" -f%-21s %s\n",
3615 f_options
[i
].string
, _(description
));
3618 printf (_(" -O[number] Set optimization level to [number]\n"));
3619 printf (_(" -Os Optimize for space rather than speed\n"));
3620 for (i
= LAST_PARAM
; i
--;)
3622 const char *description
= compiler_params
[i
].help
;
3623 const int length
= 21 - strlen (compiler_params
[i
].option
);
3625 if (description
!= NULL
&& *description
!= 0)
3626 printf (" --param %s=<value>%.*s%s\n",
3627 compiler_params
[i
].option
,
3628 length
> 0 ? length
: 1, " ",
3631 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3632 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3633 printf (_(" -w Suppress warnings\n"));
3634 printf (_(" -W Enable extra warnings\n"));
3636 for (i
= ARRAY_SIZE (W_options
); i
--;)
3638 const char *description
= W_options
[i
].description
;
3640 if (description
!= NULL
&& *description
!= 0)
3641 printf (" -W%-21s %s\n",
3642 W_options
[i
].string
, _(description
));
3645 printf (_(" -Wunused Enable unused warnings\n"));
3646 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3647 printf (_(" -p Enable function profiling\n"));
3648 printf (_(" -o <file> Place output into <file> \n"));
3650 -G <number> Put global and static data smaller than <number>\n\
3651 bytes into a special section (on some targets)\n"));
3653 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3655 if (debug_args
[i
].description
!= NULL
)
3656 printf (" -g%-21s %s\n",
3657 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3660 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3661 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3662 printf (_(" -version Display the compiler's version\n"));
3663 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3664 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3665 #if defined INSN_SCHEDULING
3666 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3668 printf (_(" --help Display this information\n"));
3673 /* Display descriptions of language specific options.
3674 If there is no description, note that there is an undocumented option.
3675 If the description is empty, do not display anything. (This allows
3676 options to be deliberately undocumented, for whatever reason).
3677 If the option string is missing, then this is a marker, indicating
3678 that the description string is in fact the name of a language, whose
3679 language specific options are to follow. */
3681 if (ARRAY_SIZE (documented_lang_options
) > 1)
3683 printf (_("\nLanguage specific options:\n"));
3685 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3687 const char *description
= documented_lang_options
[i
].description
;
3688 const char *option
= documented_lang_options
[i
].option
;
3690 if (description
== NULL
)
3695 printf (_(" %-23.23s [undocumented]\n"), option
);
3697 else if (*description
== 0)
3699 else if (option
== NULL
)
3703 (_("\nThere are undocumented %s specific options as well.\n"),
3707 printf (_("\n Options for %s:\n"), description
);
3712 printf (" %-23.23s %s\n", option
, _(description
));
3717 printf (_("\nThere are undocumented %s specific options as well.\n"),
3720 display_target_options ();
3724 display_target_options ()
3727 static bool displayed
= false;
3729 /* Avoid double printing for --help --target-help. */
3734 if (ARRAY_SIZE (target_switches
) > 1
3735 #ifdef TARGET_OPTIONS
3736 || ARRAY_SIZE (target_options
) > 1
3744 printf (_("\nTarget specific options:\n"));
3746 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3748 const char *option
= target_switches
[i
].name
;
3749 const char *description
= target_switches
[i
].description
;
3751 if (option
== NULL
|| *option
== 0)
3753 else if (description
== NULL
)
3758 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3760 else if (*description
!= 0)
3761 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3764 #ifdef TARGET_OPTIONS
3765 for (i
= ARRAY_SIZE (target_options
); i
--;)
3767 const char *option
= target_options
[i
].prefix
;
3768 const char *description
= target_options
[i
].description
;
3770 if (option
== NULL
|| *option
== 0)
3772 else if (description
== NULL
)
3777 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3779 else if (*description
!= 0)
3780 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3786 printf (_("\nThere are undocumented target specific options as well.\n"));
3788 printf (_(" They exist, but they are not documented.\n"));
3793 /* Parse a -d... command line switch. */
3796 decode_d_option (arg
)
3805 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3806 dump_file
[i
].enabled
= 1;
3812 flag_print_asm_name
= 1;
3815 flag_dump_rtl_in_asm
= 1;
3816 flag_print_asm_name
= 1;
3819 graph_dump_format
= vcg
;
3822 rtl_dump_and_exit
= 1;
3827 case 'D': /* These are handled by the preprocessor. */
3833 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3834 if (c
== dump_file
[i
].debug_switch
)
3836 dump_file
[i
].enabled
= 1;
3841 warning ("unrecognized gcc debugging option: %c", c
);
3846 /* Parse a -f... command line switch. ARG is the value after the -f.
3847 It is safe to access 'ARG - 2' to generate the full switch name.
3848 Return the number of strings consumed. */
3851 decode_f_option (arg
)
3855 const char *option_value
= NULL
;
3857 /* Search for the option in the table of binary f options. */
3858 for (j
= ARRAY_SIZE (f_options
); j
--;)
3860 if (!strcmp (arg
, f_options
[j
].string
))
3862 *f_options
[j
].variable
= f_options
[j
].on_value
;
3866 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3867 && ! strcmp (arg
+ 3, f_options
[j
].string
))
3869 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
3874 if (!strcmp (arg
, "fast-math"))
3875 set_fast_math_flags (1);
3876 else if (!strcmp (arg
, "no-fast-math"))
3877 set_fast_math_flags (0);
3878 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
3879 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
3882 read_integral_parameter (option_value
, arg
- 2,
3884 set_param_value ("max-inline-insns", val
);
3886 else if ((option_value
= skip_leading_substring (arg
, "tls-model=")))
3888 if (strcmp (option_value
, "global-dynamic") == 0)
3889 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
3890 else if (strcmp (option_value
, "local-dynamic") == 0)
3891 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
3892 else if (strcmp (option_value
, "initial-exec") == 0)
3893 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
3894 else if (strcmp (option_value
, "local-exec") == 0)
3895 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
3897 warning ("`%s': unknown tls-model option", arg
- 2);
3899 #ifdef INSN_SCHEDULING
3900 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
3901 fix_sched_param ("verbose", option_value
);
3903 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
3904 fix_register (option_value
, 1, 1);
3905 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
3906 fix_register (option_value
, 0, 1);
3907 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
3908 fix_register (option_value
, 0, 0);
3909 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
3910 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
3911 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
3913 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
3914 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
3915 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
3916 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
3918 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
3919 else if ((option_value
3920 = skip_leading_substring (arg
, "stack-limit-register=")))
3922 int reg
= decode_reg_name (option_value
);
3924 error ("unrecognized register name `%s'", option_value
);
3926 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
3928 else if ((option_value
3929 = skip_leading_substring (arg
, "stack-limit-symbol=")))
3932 nm
= ggc_strdup (option_value
);
3933 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
3935 else if ((option_value
3936 = skip_leading_substring (arg
, "message-length=")))
3937 output_set_maximum_length
3938 (&global_dc
->buffer
, read_integral_parameter
3939 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
3940 else if ((option_value
3941 = skip_leading_substring (arg
, "diagnostics-show-location=")))
3943 if (!strcmp (option_value
, "once"))
3944 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
3945 else if (!strcmp (option_value
, "every-line"))
3946 diagnostic_prefixing_rule (global_dc
)
3947 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
3949 error ("unrecognized option `%s'", arg
- 2);
3951 else if (!strcmp (arg
, "no-stack-limit"))
3952 stack_limit_rtx
= NULL_RTX
;
3953 else if (!strcmp (arg
, "preprocessed"))
3954 /* Recognise this switch but do nothing. This prevents warnings
3955 about an unrecognized switch if cpplib has not been linked in. */
3963 /* Parse a -W... command line switch. ARG is the value after the -W.
3964 It is safe to access 'ARG - 2' to generate the full switch name.
3965 Return the number of strings consumed. */
3968 decode_W_option (arg
)
3971 const char *option_value
= NULL
;
3974 /* Search for the option in the table of binary W options. */
3976 for (j
= ARRAY_SIZE (W_options
); j
--;)
3978 if (!strcmp (arg
, W_options
[j
].string
))
3980 *W_options
[j
].variable
= W_options
[j
].on_value
;
3984 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
3985 && ! strcmp (arg
+ 3, W_options
[j
].string
))
3987 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
3992 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
3993 warning ("-Wid-clash-LEN is no longer supported");
3994 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
3996 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
3998 warn_larger_than
= larger_than_size
!= -1;
4000 else if (!strcmp (arg
, "unused"))
4004 else if (!strcmp (arg
, "no-unused"))
4014 /* Parse a -g... command line switch. ARG is the value after the -g.
4015 It is safe to access 'ARG - 2' to generate the full switch name.
4016 Return the number of strings consumed. */
4019 decode_g_option (arg
)
4022 static unsigned level
= 0;
4023 /* A lot of code assumes write_symbols == NO_DEBUG if the
4024 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4025 of what debugging type has been selected). This records the
4026 selected type. It is an error to specify more than one
4028 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4029 /* Non-zero if debugging format has been explicitly set.
4030 -g and -ggdb don't explicitly set the debugging format so
4031 -gdwarf -g3 is equivalent to -gdwarf3. */
4032 static int type_explicitly_set_p
= 0;
4033 /* Indexed by enum debug_info_type. */
4034 static const char *const debug_type_names
[] =
4036 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4039 /* The maximum admissible debug level value. */
4040 static const unsigned max_debug_level
= 3;
4042 /* Look up ARG in the table. */
4043 for (da
= debug_args
; da
->arg
; da
++)
4045 const int da_len
= strlen (da
->arg
);
4047 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4049 enum debug_info_type type
= da
->debug_type
;
4050 const char *p
= arg
+ da_len
;
4052 if (*p
&& ! ISDIGIT (*p
))
4055 /* A debug flag without a level defaults to level 2.
4056 Note we do not want to call read_integral_parameter
4057 for that case since it will call atoi which
4060 ??? We may want to generalize the interface to
4061 read_integral_parameter to better handle this case
4062 if this case shows up often. */
4064 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4066 level
= (level
== 0) ? 2 : level
;
4068 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4070 error ("use -gdwarf -g%d for DWARF v1, level %d",
4073 error ("use -gdwarf-2 for DWARF v2");
4076 if (level
> max_debug_level
)
4079 ignoring option `%s' due to invalid debug level specification",
4081 level
= debug_info_level
;
4084 if (type
== NO_DEBUG
)
4086 type
= PREFERRED_DEBUGGING_TYPE
;
4088 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4090 #ifdef DWARF2_DEBUGGING_INFO
4091 type
= DWARF2_DEBUG
;
4093 #ifdef DBX_DEBUGGING_INFO
4100 if (type
== NO_DEBUG
)
4101 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4103 /* Does it conflict with an already selected type? */
4104 if (type_explicitly_set_p
4105 /* -g/-ggdb don't conflict with anything. */
4106 && da
->debug_type
!= NO_DEBUG
4107 && type
!= selected_debug_type
)
4108 warning ("`%s' ignored, conflicts with `-g%s'",
4109 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4112 /* If the format has already been set, -g/-ggdb
4113 only change the debug level. */
4114 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4115 /* Don't change debugging type. */
4119 selected_debug_type
= type
;
4120 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4123 write_symbols
= (level
== 0
4125 : selected_debug_type
);
4126 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4127 debug_info_level
= (enum debug_info_level
) level
;
4140 /* Decode the first argument in the argv as a language-independent option.
4141 Return the number of strings consumed. */
4144 independent_decode_option (argc
, argv
)
4148 char *arg
= argv
[0];
4150 if (arg
[0] != '-' || arg
[1] == 0)
4162 if (!strcmp (arg
, "-help"))
4165 exit_after_options
= 1;
4168 if (!strcmp (arg
, "-target-help"))
4170 display_target_options ();
4171 exit_after_options
= 1;
4174 if (!strcmp (arg
, "-version"))
4176 print_version (stderr
, "");
4177 exit_after_options
= 1;
4180 /* Handle '--param <name>=<value>'. */
4181 if (strcmp (arg
, "-param") == 0)
4187 error ("-param option missing argument");
4191 /* Get the '<name>=<value>' parameter. */
4193 /* Look for the `='. */
4194 equal
= strchr (arg
, '=');
4196 error ("invalid --param option: %s", arg
);
4201 /* Zero out the `=' sign so that we get two separate strings. */
4203 /* Figure out what value is specified. */
4204 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4205 if (val
!= INVALID_PARAM_VAL
)
4206 set_param_value (arg
, val
);
4208 error ("invalid parameter value `%s'", equal
+ 1);
4223 /* Already been treated in main (). Do nothing. */
4227 set_target_switch (arg
+ 1);
4231 return decode_f_option (arg
+ 1);
4234 return decode_g_option (arg
+ 1);
4237 if (!strcmp (arg
, "dumpbase"))
4242 dump_base_name
= argv
[1];
4246 decode_d_option (arg
+ 1);
4250 if (!strcmp (arg
, "pedantic"))
4252 else if (!strcmp (arg
, "pedantic-errors"))
4253 flag_pedantic_errors
= pedantic
= 1;
4254 else if (arg
[1] == 0)
4261 if (!strcmp (arg
, "quiet"))
4268 if (!strcmp (arg
, "version"))
4276 inhibit_warnings
= 1;
4285 /* We save the value of warn_uninitialized, since if they put
4286 -Wuninitialized on the command line, we need to generate a
4287 warning about not using it without also specifying -O. */
4288 if (warn_uninitialized
!= 1)
4289 warn_uninitialized
= 2;
4292 return decode_W_option (arg
+ 1);
4296 if (!strncmp (arg
, "aux-info", 8))
4303 aux_info_file_name
= argv
[1];
4304 flag_gen_aux_info
= 1;
4307 else if (arg
[8] == '=')
4309 aux_info_file_name
= arg
+ 9;
4310 flag_gen_aux_info
= 1;
4325 asm_file_name
= argv
[1];
4340 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4345 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4349 if (g_switch_val
== -1)
4353 g_switch_set
= TRUE
;
4354 g_switch_value
= g_switch_val
;
4364 /* Decode -m switches. */
4365 /* Decode the switch -mNAME. */
4368 set_target_switch (name
)
4372 int valid_target_option
= 0;
4374 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4375 if (!strcmp (target_switches
[j
].name
, name
))
4377 if (target_switches
[j
].value
< 0)
4378 target_flags
&= ~-target_switches
[j
].value
;
4380 target_flags
|= target_switches
[j
].value
;
4381 valid_target_option
= 1;
4384 #ifdef TARGET_OPTIONS
4385 if (!valid_target_option
)
4386 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4388 int len
= strlen (target_options
[j
].prefix
);
4389 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4391 *target_options
[j
].variable
= name
+ len
;
4392 valid_target_option
= 1;
4397 if (!valid_target_option
)
4398 error ("invalid option `%s'", name
);
4401 /* Print version information to FILE.
4402 Each line begins with INDENT (for the case where FILE is the
4403 assembler output file). */
4406 print_version (file
, indent
)
4411 #define __VERSION__ "[?]"
4415 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4417 "%s%s%s version %s (%s) compiled by CC.\n"
4419 , indent
, *indent
!= 0 ? " " : "",
4420 lang_hooks
.name
, version_string
, TARGET_NAME
,
4421 indent
, __VERSION__
);
4424 /* Print an option value and return the adjusted position in the line.
4425 ??? We don't handle error returns from fprintf (disk full); presumably
4426 other code will catch a disk full though. */
4429 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4432 const char *indent
, *sep
, *term
, *type
, *name
;
4434 /* The ultrix fprintf returns 0 on success, so compute the result we want
4435 here since we need it for the following test. */
4436 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4441 fprintf (file
, "%s", term
);
4446 fprintf (file
, "%s", indent
);
4447 pos
= strlen (indent
);
4449 fprintf (file
, "%s%s%s", sep
, type
, name
);
4454 /* Print active target switches to FILE.
4455 POS is the current cursor position and MAX is the size of a "line".
4456 Each line begins with INDENT and ends with TERM.
4457 Each switch is separated from the next by SEP. */
4460 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4463 const char *indent
, *sep
, *term
;
4468 /* Print the options as passed. */
4470 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4471 _("options passed: "), "");
4473 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4477 if (strcmp (*p
, "-o") == 0)
4483 if (strcmp (*p
, "-quiet") == 0)
4485 if (strcmp (*p
, "-version") == 0)
4490 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4493 fprintf (file
, "%s", term
);
4495 /* Print the -f and -m options that have been enabled.
4496 We don't handle language specific options but printing argv
4499 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4500 _("options enabled: "), "");
4502 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4503 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4504 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4505 "-f", f_options
[j
].string
);
4507 /* Print target specific options. */
4509 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4510 if (target_switches
[j
].name
[0] != '\0'
4511 && target_switches
[j
].value
> 0
4512 && ((target_switches
[j
].value
& target_flags
)
4513 == target_switches
[j
].value
))
4515 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4516 "-m", target_switches
[j
].name
);
4519 #ifdef TARGET_OPTIONS
4520 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4521 if (*target_options
[j
].variable
!= NULL
)
4524 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4525 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4526 prefix
, *target_options
[j
].variable
);
4530 fprintf (file
, "%s", term
);
4533 /* Open assembly code output file. Do this even if -fsyntax-only is
4534 on, because then the driver will have provided the name of a
4535 temporary file or bit bucket for us. NAME is the file specified on
4536 the command line, possibly NULL. */
4538 init_asm_output (name
)
4541 if (name
== NULL
&& asm_file_name
== 0)
4542 asm_out_file
= stdout
;
4545 if (asm_file_name
== 0)
4547 int len
= strlen (dump_base_name
);
4548 char *dumpname
= (char *) xmalloc (len
+ 6);
4549 memcpy (dumpname
, dump_base_name
, len
+ 1);
4550 strip_off_ending (dumpname
, len
);
4551 strcat (dumpname
, ".s");
4552 asm_file_name
= dumpname
;
4554 if (!strcmp (asm_file_name
, "-"))
4555 asm_out_file
= stdout
;
4557 asm_out_file
= fopen (asm_file_name
, "w");
4558 if (asm_out_file
== 0)
4559 fatal_io_error ("can't open %s for writing", asm_file_name
);
4562 #ifdef IO_BUFFER_SIZE
4563 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
4564 _IOFBF
, IO_BUFFER_SIZE
);
4567 if (!flag_syntax_only
)
4569 #ifdef ASM_FILE_START
4570 ASM_FILE_START (asm_out_file
);
4573 #ifdef ASM_COMMENT_START
4574 if (flag_verbose_asm
)
4576 /* Print the list of options in effect. */
4577 print_version (asm_out_file
, ASM_COMMENT_START
);
4578 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4579 ASM_COMMENT_START
, " ", "\n");
4580 /* Add a blank line here so it appears in assembler output but not
4582 fprintf (asm_out_file
, "\n");
4588 /* Initialization of the front end environment, before command line
4589 options are parsed. Signal handlers, internationalization etc.
4590 ARGV0 is main's argv[0]. */
4592 general_init (argv0
)
4597 p
= argv0
+ strlen (argv0
);
4598 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4602 xmalloc_set_program_name (progname
);
4604 gcc_init_libintl ();
4606 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4608 signal (SIGSEGV
, crash_signal
);
4611 signal (SIGILL
, crash_signal
);
4614 signal (SIGBUS
, crash_signal
);
4617 signal (SIGABRT
, crash_signal
);
4619 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4620 signal (SIGIOT
, crash_signal
);
4623 signal (SIGFPE
, crash_signal
);
4626 /* Initialize the diagnostics reporting machinery, so option parsing
4627 can give warnings and errors. */
4628 diagnostic_initialize (global_dc
);
4631 /* Parse command line options and set default flag values, called
4632 after language-independent option-independent initialization. Do
4633 minimal options processing. Outputting diagnostics is OK, but GC
4634 and identifier hashtables etc. are not initialized yet. */
4636 parse_options_and_default_flags (argc
, argv
)
4642 /* Save in case md file wants to emit args as a comment. */
4646 /* Initialize register usage now so switches may override. */
4649 /* Register the language-independent parameters. */
4650 add_params (lang_independent_params
, LAST_PARAM
);
4652 /* Perform language-specific options initialization. */
4653 (*lang_hooks
.init_options
) ();
4655 /* Scan to see what optimization level has been specified. That will
4656 determine the default value of many flags. */
4657 for (i
= 1; i
< argc
; i
++)
4659 if (!strcmp (argv
[i
], "-O"))
4664 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4666 /* Handle -Os, -O2, -O3, -O69, ... */
4667 char *p
= &argv
[i
][2];
4669 if ((p
[0] == 's') && (p
[1] == 0))
4673 /* Optimizing for size forces optimize to be 2. */
4678 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4679 if (optimize_val
!= -1)
4681 optimize
= optimize_val
;
4690 flag_merge_constants
= 0;
4696 flag_thread_jumps
= 1;
4698 flag_delayed_branch
= 1;
4700 #ifdef CAN_DEBUG_WITHOUT_FP
4701 flag_omit_frame_pointer
= 1;
4703 flag_guess_branch_prob
= 1;
4704 flag_cprop_registers
= 1;
4705 flag_loop_optimize
= 1;
4706 flag_crossjumping
= 1;
4707 flag_if_conversion
= 1;
4708 flag_if_conversion2
= 1;
4713 flag_optimize_sibling_calls
= 1;
4714 flag_cse_follow_jumps
= 1;
4715 flag_cse_skip_blocks
= 1;
4717 flag_expensive_optimizations
= 1;
4718 flag_strength_reduce
= 1;
4719 flag_rerun_cse_after_loop
= 1;
4720 flag_rerun_loop_opt
= 1;
4721 flag_caller_saves
= 1;
4724 #ifdef INSN_SCHEDULING
4725 flag_schedule_insns
= 1;
4726 flag_schedule_insns_after_reload
= 1;
4729 flag_strict_aliasing
= 1;
4730 flag_delete_null_pointer_checks
= 1;
4731 flag_reorder_blocks
= 1;
4732 flag_reorder_functions
= 1;
4737 flag_inline_functions
= 1;
4738 flag_rename_registers
= 1;
4741 if (optimize
< 2 || optimize_size
)
4746 align_functions
= 1;
4749 /* Initialize whether `char' is signed. */
4750 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4751 #ifdef DEFAULT_SHORT_ENUMS
4752 /* Initialize how much space enums occupy, by default. */
4753 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4756 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4759 set_target_switch ("");
4761 /* Unwind tables are always present in an ABI-conformant IA-64
4762 object file, so the default should be ON. */
4763 #ifdef IA64_UNWIND_INFO
4764 flag_unwind_tables
= IA64_UNWIND_INFO
;
4767 #ifdef OPTIMIZATION_OPTIONS
4768 /* Allow default optimizations to be specified on a per-machine basis. */
4769 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4772 /* Perform normal command line switch decoding. */
4773 for (i
= 1; i
< argc
;)
4776 int indep_processed
;
4778 /* Give the language a chance to decode the option for itself. */
4779 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4781 if (lang_processed
>= 0)
4782 /* Now see if the option also has a language independent meaning.
4783 Some options are both language specific and language independent,
4785 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4788 lang_processed
= -lang_processed
;
4789 indep_processed
= 0;
4792 if (lang_processed
|| indep_processed
)
4793 i
+= MAX (lang_processed
, indep_processed
);
4796 const char *option
= NULL
;
4797 const char *lang
= NULL
;
4800 /* It is possible that the command line switch is not valid for the
4801 current language, but it is valid for another language. In order
4802 to be compatible with previous versions of the compiler (which
4803 did not issue an error message in this case) we check for this
4804 possibility here. If we do find a match, then if extra_warnings
4805 is set we generate a warning message, otherwise we will just
4806 ignore the option. */
4807 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4809 option
= documented_lang_options
[j
].option
;
4812 lang
= documented_lang_options
[j
].description
;
4813 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4817 if (j
!= ARRAY_SIZE (documented_lang_options
))
4821 warning ("ignoring command line option '%s'", argv
[i
]);
4824 ("(it is valid for %s but not the selected language)",
4828 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4829 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4831 error ("unrecognized option `%s'", argv
[i
]);
4837 if (flag_no_inline
== 2)
4840 flag_really_no_inline
= flag_no_inline
;
4842 /* Set flag_no_inline before the post_options () hook. The C front
4843 ends use it to determine tree inlining defaults. FIXME: such
4844 code should be lang-independent when all front ends use tree
4845 inlining, in which case it, and this condition, should be moved
4846 to the top of process_options() instead. */
4849 /* Inlining does not work if not optimizing,
4850 so force it not to be done. */
4854 /* The c_decode_option function and decode_option hook set
4855 this to `2' if -Wall is used, so we can avoid giving out
4856 lots of errors for people who don't realize what -Wall does. */
4857 if (warn_uninitialized
== 1)
4858 warning ("-Wuninitialized is not supported without -O");
4861 if (flag_really_no_inline
== 2)
4862 flag_really_no_inline
= flag_no_inline
;
4864 /* All command line options have been parsed; allow the front end to
4865 perform consistency checks, etc. */
4866 (*lang_hooks
.post_options
) ();
4869 /* Process the options that have been parsed. */
4873 #ifdef OVERRIDE_OPTIONS
4874 /* Some machines may reject certain combinations of options. */
4878 /* Set up the align_*_log variables, defaulting them to 1 if they
4879 were still unset. */
4880 if (align_loops
<= 0) align_loops
= 1;
4881 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4882 align_loops_max_skip
= align_loops
- 1;
4883 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4884 if (align_jumps
<= 0) align_jumps
= 1;
4885 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4886 align_jumps_max_skip
= align_jumps
- 1;
4887 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4888 if (align_labels
<= 0) align_labels
= 1;
4889 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4890 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4891 align_labels_max_skip
= align_labels
- 1;
4892 if (align_functions
<= 0) align_functions
= 1;
4893 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4895 /* Unrolling all loops implies that standard loop unrolling must also
4897 if (flag_unroll_all_loops
)
4898 flag_unroll_loops
= 1;
4899 /* Loop unrolling requires that strength_reduction be on also. Silently
4900 turn on strength reduction here if it isn't already on. Also, the loop
4901 unrolling code assumes that cse will be run after loop, so that must
4902 be turned on also. */
4903 if (flag_unroll_loops
)
4905 flag_strength_reduce
= 1;
4906 flag_rerun_cse_after_loop
= 1;
4909 if (flag_non_call_exceptions
)
4910 flag_asynchronous_unwind_tables
= 1;
4911 if (flag_asynchronous_unwind_tables
)
4912 flag_unwind_tables
= 1;
4914 /* Warn about options that are not supported on this machine. */
4915 #ifndef INSN_SCHEDULING
4916 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4917 warning ("instruction scheduling not supported on this target machine");
4920 if (flag_delayed_branch
)
4921 warning ("this target machine does not have delayed branches");
4924 user_label_prefix
= USER_LABEL_PREFIX
;
4925 if (flag_leading_underscore
!= -1)
4927 /* If the default prefix is more complicated than "" or "_",
4928 issue a warning and ignore this option. */
4929 if (user_label_prefix
[0] == 0 ||
4930 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4932 user_label_prefix
= flag_leading_underscore
? "_" : "";
4935 warning ("-f%sleading-underscore not supported on this target machine",
4936 flag_leading_underscore
? "" : "no-");
4939 /* If we are in verbose mode, write out the version and maybe all the
4940 option flags in use. */
4943 print_version (stderr
, "");
4945 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4951 if (flag_syntax_only
)
4953 write_symbols
= NO_DEBUG
;
4957 /* Now we know write_symbols, set up the debug hooks based on it.
4958 By default we do nothing for debug output. */
4959 #if defined(DBX_DEBUGGING_INFO)
4960 if (write_symbols
== DBX_DEBUG
)
4961 debug_hooks
= &dbx_debug_hooks
;
4963 #if defined(XCOFF_DEBUGGING_INFO)
4964 if (write_symbols
== XCOFF_DEBUG
)
4965 debug_hooks
= &xcoff_debug_hooks
;
4967 #ifdef SDB_DEBUGGING_INFO
4968 if (write_symbols
== SDB_DEBUG
)
4969 debug_hooks
= &sdb_debug_hooks
;
4971 #ifdef DWARF_DEBUGGING_INFO
4972 if (write_symbols
== DWARF_DEBUG
)
4973 debug_hooks
= &dwarf_debug_hooks
;
4975 #ifdef DWARF2_DEBUGGING_INFO
4976 if (write_symbols
== DWARF2_DEBUG
)
4977 debug_hooks
= &dwarf2_debug_hooks
;
4979 #ifdef VMS_DEBUGGING_INFO
4980 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4981 debug_hooks
= &vmsdbg_debug_hooks
;
4984 /* If auxiliary info generation is desired, open the output file.
4985 This goes in the same directory as the source file--unlike
4986 all the other output files. */
4987 if (flag_gen_aux_info
)
4989 aux_info_file
= fopen (aux_info_file_name
, "w");
4990 if (aux_info_file
== 0)
4991 fatal_io_error ("can't open %s", aux_info_file_name
);
4994 if (! targetm
.have_named_sections
)
4996 if (flag_function_sections
)
4998 warning ("-ffunction-sections not supported for this target");
4999 flag_function_sections
= 0;
5001 if (flag_data_sections
)
5003 warning ("-fdata-sections not supported for this target");
5004 flag_data_sections
= 0;
5008 if (flag_function_sections
&& profile_flag
)
5010 warning ("-ffunction-sections disabled; it makes profiling impossible");
5011 flag_function_sections
= 0;
5014 #ifndef HAVE_prefetch
5015 if (flag_prefetch_loop_arrays
)
5017 warning ("-fprefetch-loop-arrays not supported for this target");
5018 flag_prefetch_loop_arrays
= 0;
5021 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
5023 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5024 flag_prefetch_loop_arrays
= 0;
5028 /* This combination of options isn't handled for i386 targets and doesn't
5029 make much sense anyway, so don't allow it. */
5030 if (flag_prefetch_loop_arrays
&& optimize_size
)
5032 warning ("-fprefetch-loop-arrays is not supported with -Os");
5033 flag_prefetch_loop_arrays
= 0;
5036 #ifndef OBJECT_FORMAT_ELF
5037 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
5038 warning ("-ffunction-sections may affect debugging on some targets");
5042 /* Language-independent initialization, before language-dependent
5045 lang_independent_init ()
5047 /* Initialize the garbage-collector, and string pools. */
5049 ggc_add_rtx_root (&stack_limit_rtx
, 1);
5050 ggc_add_tree_root (¤t_function_decl
, 1);
5051 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
5056 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
5057 || debug_info_level
== DINFO_LEVEL_VERBOSE
5058 #ifdef VMS_DEBUGGING_INFO
5059 /* Enable line number info for traceback */
5060 || debug_info_level
> DINFO_LEVEL_NONE
5062 || flag_test_coverage
5063 || warn_notreached
);
5069 init_function_once ();
5070 init_stor_layout_once ();
5071 init_varasm_once ();
5072 init_EXPR_INSN_LIST_cache ();
5074 /* The following initialization functions need to generate rtl, so
5075 provide a dummy function context for them. */
5076 init_dummy_function_start ();
5078 if (flag_caller_saves
)
5079 init_caller_save ();
5080 expand_dummy_function_end ();
5083 /* Language-dependent initialization. Returns non-zero on success. */
5085 lang_dependent_init (name
)
5088 if (dump_base_name
== 0)
5089 dump_base_name
= name
? name
: "gccdump";
5091 /* Front-end initialization. This hook can assume that GC,
5092 identifier hashes etc. are set up, but debug initialization is
5093 not done yet. This routine must return the original filename
5094 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5095 name
= (*lang_hooks
.init
) (name
);
5099 /* Is this duplication necessary? */
5100 name
= ggc_strdup (name
);
5101 main_input_filename
= input_filename
= name
;
5102 init_asm_output (name
);
5104 /* These create various _DECL nodes, so need to be called after the
5105 front end is initialized. */
5110 /* Put an entry on the input file stack for the main input file. */
5111 push_srcloc (input_filename
, 0);
5113 /* If dbx symbol table desired, initialize writing it and output the
5114 predefined types. */
5115 timevar_push (TV_SYMOUT
);
5117 #ifdef DWARF2_UNWIND_INFO
5118 if (dwarf2out_do_frame ())
5119 dwarf2out_frame_init ();
5122 /* Now we have the correct original filename, we can initialize
5124 (*debug_hooks
->init
) (name
);
5126 timevar_pop (TV_SYMOUT
);
5131 /* Clean up: close opened files, etc. */
5136 /* Close the dump files. */
5137 if (flag_gen_aux_info
)
5139 fclose (aux_info_file
);
5141 unlink (aux_info_file_name
);
5144 /* Close non-debugging input and output files. Take special care to note
5145 whether fclose returns an error, since the pages might still be on the
5146 buffer chain while the file is open. */
5150 if (ferror (asm_out_file
) != 0)
5151 fatal_io_error ("error writing to %s", asm_file_name
);
5152 if (fclose (asm_out_file
) != 0)
5153 fatal_io_error ("error closing %s", asm_file_name
);
5156 /* Do whatever is necessary to finish printing the graphs. */
5157 if (graph_dump_format
!= no_graph
)
5161 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
5162 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
5167 sprintf (seq
, DUMPFILE_FORMAT
, i
);
5168 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
5169 finish_graph_dump_file (dump_base_name
, suffix
);
5176 ggc_print_statistics ();
5177 stringpool_statistics ();
5178 dump_tree_statistics ();
5181 /* Free up memory for the benefit of leak detectors. */
5184 /* Language-specific end of compilation actions. */
5185 (*lang_hooks
.finish
) ();
5188 /* Initialize the compiler, and compile the input file. */
5192 /* The bulk of command line switch processing. */
5195 /* We cannot start timing until after options are processed since that
5196 says if we run timers or not. */
5198 timevar_start (TV_TOTAL
);
5200 /* Language-independent initialization. Also sets up GC, identifier
5202 lang_independent_init ();
5204 /* Language-dependent initialization. Returns true on success. */
5205 if (lang_dependent_init (filename
))
5210 /* Stop timing and print the times. */
5211 timevar_stop (TV_TOTAL
);
5212 timevar_print (stderr
);
5215 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5216 Decode command args, then call compile_file.
5217 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5218 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5220 It is not safe to call this function more than once. */
5223 toplev_main (argc
, argv
)
5229 /* Initialization of GCC's environment, and diagnostics. */
5230 general_init (argv
[0]);
5232 /* Parse the options and do minimal processing; basically just
5233 enough to default flags appropriately. */
5234 parse_options_and_default_flags (argc
, argv
);
5236 /* Exit early if we can (e.g. -help). */
5237 if (!errorcount
&& !exit_after_options
)
5240 if (errorcount
|| sorrycount
)
5241 return (FATAL_EXIT_CODE
);
5243 return (SUCCESS_EXIT_CODE
);