1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
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 "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
70 #ifdef DWARF_DEBUGGING_INFO
74 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
75 #include "dwarf2out.h"
78 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
82 #ifdef SDB_DEBUGGING_INFO
86 #ifdef XCOFF_DEBUGGING_INFO
91 /* The extra parameters substantially improve the I/O performance. */
94 vms_fopen (fname
, type
)
98 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
99 fixed arguments, which matches ANSI's specification but not VAXCRTL's
100 pre-ANSI implementation. This hack circumvents the mismatch problem. */
101 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
104 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
105 "deq=64", "fop=tef", "shr=nil");
107 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
110 #define fopen vms_fopen
113 #ifndef DEFAULT_GDB_EXTENSIONS
114 #define DEFAULT_GDB_EXTENSIONS 1
117 /* If more than one debugging type is supported, you must define
118 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
120 This is one long line cause VAXC can't handle a \-newline. */
121 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
122 #ifndef PREFERRED_DEBUGGING_TYPE
123 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
124 #endif /* no PREFERRED_DEBUGGING_TYPE */
125 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
126 so the following code needn't care. */
127 #ifdef DBX_DEBUGGING_INFO
128 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
130 #ifdef SDB_DEBUGGING_INFO
131 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
133 #ifdef DWARF_DEBUGGING_INFO
134 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
136 #ifdef DWARF2_DEBUGGING_INFO
137 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
139 #ifdef XCOFF_DEBUGGING_INFO
140 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
142 #endif /* More than one debugger format enabled. */
144 /* If still not defined, must have been because no debugging formats
146 #ifndef PREFERRED_DEBUGGING_TYPE
147 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
150 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
151 extern char **environ
;
154 /* Carry information from ASM_DECLARE_OBJECT_NAME
155 to ASM_FINISH_DECLARE_OBJECT. */
157 extern int size_directive_output
;
158 extern tree last_assemble_variable_decl
;
160 static void set_target_switch
PARAMS ((const char *));
161 static const char *decl_name
PARAMS ((tree
, int));
163 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
164 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
165 static void compile_file
PARAMS ((const char *));
166 static void display_help
PARAMS ((void));
167 static void display_target_options
PARAMS ((void));
169 static void decode_d_option
PARAMS ((const char *));
170 static int decode_f_option
PARAMS ((const char *));
171 static int decode_W_option
PARAMS ((const char *));
172 static int decode_g_option
PARAMS ((const char *));
173 static unsigned int independent_decode_option
PARAMS ((int, char **));
175 static void print_version
PARAMS ((FILE *, const char *));
176 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
177 const char *, const char *,
178 const char *, const char *));
179 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
180 const char *, const char *));
182 /* Length of line when printing switch values. */
185 /* Name of program invoked, sans directories. */
187 const char *progname
;
189 /* Copy of arguments to toplev_main. */
193 /* Name of current original source file (what was input to cpp).
194 This comes from each #-command in the actual input. */
196 const char *input_filename
;
198 /* Name of top-level original source file (what was input to cpp).
199 This comes from the #-command at the beginning of the actual input.
200 If there isn't any there, then this is the cc1 input file name. */
202 const char *main_input_filename
;
204 /* Current line number in real source file. */
208 /* Nonzero if it is unsafe to create any new pseudo registers. */
211 /* Stack of currently pending input files. */
213 struct file_stack
*input_file_stack
;
215 /* Incremented on each change to input_file_stack. */
216 int input_file_stack_tick
;
218 /* Name to use as base of names for dump output files. */
220 const char *dump_base_name
;
222 /* Bit flags that specify the machine subtype we are compiling for.
223 Bits are tested using macros TARGET_... defined in the tm.h file
224 and set by `-m...' switches. Must be defined in rtlanal.c. */
226 extern int target_flags
;
228 /* Describes a dump file. */
230 struct dump_file_info
232 /* The unique extension to apply, e.g. ".jump". */
233 const char *const extension
;
235 /* The -d<c> character that enables this dump file. */
236 char const debug_switch
;
238 /* True if there is a corresponding graph dump file. */
239 char const graph_dump_p
;
241 /* True if the user selected this dump. */
244 /* True if the files have been initialized (ie truncated). */
248 /* Enumerate the extant dump files. */
287 /* Describes all the dump files. Should be kept in order of the
288 pass and in sync with dump_file_index above.
290 Remaining -d letters:
296 struct dump_file_info dump_file
[DFI_MAX
] =
298 { "rtl", 'r', 0, 0, 0 },
299 { "sibling", 'i', 0, 0, 0 },
300 { "eh", 'h', 0, 0, 0 },
301 { "jump", 'j', 0, 0, 0 },
302 { "ssa", 'e', 1, 0, 0 },
303 { "ssadce", 'X', 1, 0, 0 },
304 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
305 { "cse", 's', 0, 0, 0 },
306 { "addressof", 'F', 0, 0, 0 },
307 { "gcse", 'G', 1, 0, 0 },
308 { "loop", 'L', 1, 0, 0 },
309 { "cse2", 't', 1, 0, 0 },
310 { "cfg", 'f', 1, 0, 0 },
311 { "bp", 'b', 1, 0, 0 },
312 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
313 { "combine", 'c', 1, 0, 0 },
314 { "ce", 'C', 1, 0, 0 },
315 { "regmove", 'N', 1, 0, 0 },
316 { "sched", 'S', 1, 0, 0 },
317 { "lreg", 'l', 1, 0, 0 },
318 { "greg", 'g', 1, 0, 0 },
319 { "postreload", 'o', 1, 0, 0 },
320 { "flow2", 'w', 1, 0, 0 },
321 { "peephole2", 'z', 1, 0, 0 },
322 { "rnreg", 'n', 1, 0, 0 },
323 { "ce2", 'E', 1, 0, 0 },
324 { "sched2", 'R', 1, 0, 0 },
325 { "bbro", 'B', 1, 0, 0 },
326 { "jump2", 'J', 1, 0, 0 },
327 { "mach", 'M', 1, 0, 0 },
328 { "dbr", 'd', 0, 0, 0 },
329 { "stack", 'k', 1, 0, 0 },
332 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
333 static void close_dump_file
PARAMS ((enum dump_file_index
,
334 void (*) (FILE *, rtx
), rtx
));
336 /* Other flags saying which kinds of debugging dump have been requested. */
338 int rtl_dump_and_exit
;
339 int flag_print_asm_name
;
340 static int version_flag
;
341 static char *filename
;
342 enum graph_dump_types graph_dump_format
;
344 /* Name for output file of assembly code, specified with -o. */
348 /* Value of the -G xx switch, and whether it was passed or not. */
352 /* Type(s) of debugging information we are producing (if any).
353 See flags.h for the definitions of the different possible
354 types of debugging information. */
355 enum debug_info_type write_symbols
= NO_DEBUG
;
357 /* Level of debugging information we are producing. See flags.h
358 for the definitions of the different possible levels. */
359 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
361 /* Nonzero means use GNU-only extensions in the generated symbolic
362 debugging information. */
363 /* Currently, this only has an effect when write_symbols is set to
364 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
365 int use_gnu_debug_info_extensions
= 0;
367 /* Nonzero means do optimizations. -O.
368 Particular numeric values stand for particular amounts of optimization;
369 thus, -O2 stores 2 here. However, the optimizations beyond the basic
370 ones are not controlled directly by this variable. Instead, they are
371 controlled by individual `flag_...' variables that are defaulted
372 based on this variable. */
376 /* Nonzero means optimize for size. -Os.
377 The only valid values are zero and non-zero. When optimize_size is
378 non-zero, optimize defaults to 2, but certain individual code
379 bloating optimizations are disabled. */
381 int optimize_size
= 0;
383 /* Nonzero if we should exit after parsing options. */
384 static int exit_after_options
= 0;
386 /* The FUNCTION_DECL for the function currently being compiled,
387 or 0 if between functions. */
388 tree current_function_decl
;
390 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
392 tree current_function_func_begin_label
;
394 /* Pointer to function to compute the name to use to print a declaration.
395 DECL is the declaration in question.
396 VERBOSITY determines what information will be printed:
397 0: DECL_NAME, demangled as necessary.
398 1: and scope information.
399 2: and any other information that might be interesting, such as function
400 parameter types in C++. */
402 const char *(*decl_printable_name
) PARAMS ((tree
, int));
404 /* Pointer to function to compute rtl for a language-specific tree code. */
406 typedef rtx (*lang_expand_expr_t
)
407 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
408 enum expand_modifier modifier
));
410 lang_expand_expr_t lang_expand_expr
= 0;
412 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
414 /* Pointer to function to finish handling an incomplete decl at the
415 end of compilation. */
417 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
419 /* Nonzero if doing dwarf2 duplicate elimination. */
421 int flag_eliminate_dwarf2_dups
= 0;
423 /* Nonzero if generating code to do profiling. */
425 int profile_flag
= 0;
427 /* Nonzero if generating code to do profiling on a line-by-line basis. */
429 int profile_block_flag
;
431 /* Nonzero if generating code to profile program flow graph arcs. */
433 int profile_arc_flag
= 0;
435 /* Nonzero if generating info for gcov to calculate line test coverage. */
437 int flag_test_coverage
= 0;
439 /* Nonzero indicates that branch taken probabilities should be calculated. */
441 int flag_branch_probabilities
= 0;
443 /* Nonzero if basic blocks should be reordered. */
445 int flag_reorder_blocks
= 0;
447 /* Nonzero if registers should be renamed. */
449 int flag_rename_registers
= 0;
451 /* Nonzero for -pedantic switch: warn about anything
452 that standard spec forbids. */
456 /* Temporarily suppress certain warnings.
457 This is set while reading code from a system header file. */
459 int in_system_header
= 0;
461 /* Don't print functions as they are compiled. -quiet. */
465 /* Print times taken by the various passes. -ftime-report. */
469 /* Print memory still in use at end of compilation (which may have little
470 to do with peak memory consumption). -fmem-report. */
474 /* Non-zero means to collect statistics which might be expensive
475 and to print them when we are done. */
476 int flag_detailed_statistics
= 0;
481 /* Nonzero means `char' should be signed. */
483 int flag_signed_char
;
485 /* Nonzero means give an enum type only as many bytes as it needs. */
487 int flag_short_enums
;
489 /* Nonzero for -fcaller-saves: allocate values in regs that need to
490 be saved across function calls, if that produces overall better code.
491 Optional now, so people can test it. */
493 #ifdef DEFAULT_CALLER_SAVES
494 int flag_caller_saves
= 1;
496 int flag_caller_saves
= 0;
499 /* Nonzero if structures and unions should be returned in memory.
501 This should only be defined if compatibility with another compiler or
502 with an ABI is needed, because it results in slower code. */
504 #ifndef DEFAULT_PCC_STRUCT_RETURN
505 #define DEFAULT_PCC_STRUCT_RETURN 1
508 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
510 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
512 /* Nonzero for -fforce-mem: load memory value into a register
513 before arithmetic on it. This makes better cse but slower compilation. */
515 int flag_force_mem
= 0;
517 /* Nonzero for -fforce-addr: load memory address into a register before
518 reference to memory. This makes better cse but slower compilation. */
520 int flag_force_addr
= 0;
522 /* Nonzero for -fdefer-pop: don't pop args after each function call;
523 instead save them up to pop many calls' args with one insns. */
525 int flag_defer_pop
= 0;
527 /* Nonzero for -ffloat-store: don't allocate floats and doubles
528 in extended-precision registers. */
530 int flag_float_store
= 0;
532 /* Nonzero for -fcse-follow-jumps:
533 have cse follow jumps to do a more extensive job. */
535 int flag_cse_follow_jumps
;
537 /* Nonzero for -fcse-skip-blocks:
538 have cse follow a branch around a block. */
539 int flag_cse_skip_blocks
;
541 /* Nonzero for -fexpensive-optimizations:
542 perform miscellaneous relatively-expensive optimizations. */
543 int flag_expensive_optimizations
;
545 /* Nonzero for -fthread-jumps:
546 have jump optimize output of loop. */
548 int flag_thread_jumps
;
550 /* Nonzero enables strength-reduction in loop.c. */
552 int flag_strength_reduce
= 0;
554 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
555 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
556 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
559 int flag_unroll_loops
;
561 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
562 This is generally not a win. */
564 int flag_unroll_all_loops
;
566 /* Nonzero forces all invariant computations in loops to be moved
569 int flag_move_all_movables
= 0;
571 /* Nonzero forces all general induction variables in loops to be
574 int flag_reduce_all_givs
= 0;
576 /* Nonzero to perform full register move optimization passes. This is the
579 int flag_regmove
= 0;
581 /* Nonzero for -fwritable-strings:
582 store string constants in data segment and don't uniquize them. */
584 int flag_writable_strings
= 0;
586 /* Nonzero means don't put addresses of constant functions in registers.
587 Used for compiling the Unix kernel, where strange substitutions are
588 done on the assembly output. */
590 int flag_no_function_cse
= 0;
592 /* Nonzero for -fomit-frame-pointer:
593 don't make a frame pointer in simple functions that don't require one. */
595 int flag_omit_frame_pointer
= 0;
597 /* Nonzero means place each function into its own section on those platforms
598 which support arbitrary section names and unlimited numbers of sections. */
600 int flag_function_sections
= 0;
602 /* ... and similar for data. */
604 int flag_data_sections
= 0;
606 /* Nonzero to inhibit use of define_optimization peephole opts. */
608 int flag_no_peephole
= 0;
610 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
612 int flag_optimize_sibling_calls
= 0;
614 /* Nonzero means the front end generally wants `errno' maintained by math
615 operations, like built-in SQRT. */
617 int flag_errno_math
= 1;
619 /* Nonzero means that unsafe floating-point math optimizations are allowed
620 for the sake of speed. IEEE compliance is not guaranteed, and operations
621 are allowed to assume that their arguments and results are "normal"
622 (e.g., nonnegative for SQRT). */
624 int flag_unsafe_math_optimizations
= 0;
626 /* Zero means that floating-point math operations cannot generate a
627 (user-visible) trap. This is the case, for example, in nonstop
628 IEEE 754 arithmetic. */
630 int flag_trapping_math
= 1;
632 /* 0 means straightforward implementation of complex divide acceptable.
633 1 means wide ranges of inputs must work for complex divide.
634 2 means C99-like requirements for complex divide (not yet implemented). */
636 int flag_complex_divide_method
= 0;
638 /* Nonzero means all references through pointers are volatile. */
642 /* Nonzero means treat all global and extern variables as volatile. */
644 int flag_volatile_global
;
646 /* Nonzero means treat all static variables as volatile. */
648 int flag_volatile_static
;
650 /* Nonzero means just do syntax checking; don't output anything. */
652 int flag_syntax_only
= 0;
654 /* Nonzero means perform global cse. */
656 static int flag_gcse
;
658 /* Nonzero means to use global dataflow analysis to eliminate
659 useless null pointer tests. */
661 static int flag_delete_null_pointer_checks
;
663 /* Nonzero means to do the enhanced load motion during gcse, which trys
664 to hoist loads by not killing them when a store to the same location
667 int flag_gcse_lm
= 1;
669 /* Nonzero means to perform store motion after gcse, which will try to
670 move stores closer to the exit block. Its not very effective without
673 int flag_gcse_sm
= 1;
675 /* Nonzero means to rerun cse after loop optimization. This increases
676 compilation time about 20% and picks up a few more common expressions. */
678 static int flag_rerun_cse_after_loop
;
680 /* Nonzero means to run loop optimizations twice. */
682 int flag_rerun_loop_opt
;
684 /* Nonzero for -finline-functions: ok to inline functions that look like
685 good inline candidates. */
687 int flag_inline_functions
;
689 /* Nonzero for -fkeep-inline-functions: even if we make a function
690 go inline everywhere, keep its definition around for debugging
693 int flag_keep_inline_functions
;
695 /* Nonzero means that functions will not be inlined. */
699 /* Nonzero means that we should emit static const variables
700 regardless of whether or not optimization is turned on. */
702 int flag_keep_static_consts
= 1;
704 /* Nonzero means we should be saving declaration info into a .X file. */
706 int flag_gen_aux_info
= 0;
708 /* Specified name of aux-info file. */
710 static char *aux_info_file_name
;
712 /* Nonzero means make the text shared if supported. */
714 int flag_shared_data
;
716 /* Nonzero means schedule into delayed branch slots if supported. */
718 int flag_delayed_branch
;
720 /* Nonzero if we are compiling pure (sharable) code.
721 Value is 1 if we are doing reasonable (i.e. simple
722 offset into offset table) pic. Value is 2 if we can
723 only perform register offsets. */
727 /* Nonzero means generate extra code for exception handling and enable
728 exception handling. */
732 /* Nonzero means generate frame unwind info table when supported. */
734 int flag_unwind_tables
= 0;
736 /* Nonzero means don't place uninitialized global data in common storage
741 /* Nonzero means pretend it is OK to examine bits of target floats,
742 even if that isn't true. The resulting code will have incorrect constants,
743 but the same series of instructions that the native compiler would make. */
745 int flag_pretend_float
;
747 /* Nonzero means change certain warnings into errors.
748 Usually these are warnings about failure to conform to some standard. */
750 int flag_pedantic_errors
= 0;
752 /* flag_schedule_insns means schedule insns within basic blocks (before
754 flag_schedule_insns_after_reload means schedule insns after
757 int flag_schedule_insns
= 0;
758 int flag_schedule_insns_after_reload
= 0;
760 /* The following flags have effect only for scheduling before register
763 flag_schedule_interblock means schedule insns accross basic blocks.
764 flag_schedule_speculative means allow speculative motion of non-load insns.
765 flag_schedule_speculative_load means allow speculative motion of some
767 flag_schedule_speculative_load_dangerous allows speculative motion of more
770 int flag_schedule_interblock
= 1;
771 int flag_schedule_speculative
= 1;
772 int flag_schedule_speculative_load
= 0;
773 int flag_schedule_speculative_load_dangerous
= 0;
775 int flag_single_precision_constant
;
777 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
778 by a cheaper branch on a count register. */
779 int flag_branch_on_count_reg
= 1;
781 /* -finhibit-size-directive inhibits output of .size for ELF.
782 This is used only for compiling crtstuff.c,
783 and it may be extended to other effects
784 needed for crtstuff.c on other systems. */
785 int flag_inhibit_size_directive
= 0;
787 /* -fverbose-asm causes extra commentary information to be produced in
788 the generated assembly code (to make it more readable). This option
789 is generally only of use to those who actually need to read the
790 generated assembly code (perhaps while debugging the compiler itself).
791 -fno-verbose-asm, the default, causes the extra information
792 to be omitted and is useful when comparing two assembler files. */
794 int flag_verbose_asm
= 0;
796 /* -dA causes debug commentary information to be produced in
797 the generated assembly code (to make it more readable). This option
798 is generally only of use to those who actually need to read the
799 generated assembly code (perhaps while debugging the compiler itself).
800 Currently, this switch is only used by dwarfout.c; however, it is intended
801 to be a catchall for printing debug information in the assembler file. */
803 int flag_debug_asm
= 0;
805 /* -dP causes the rtl to be emitted as a comment in assembly. */
807 int flag_dump_rtl_in_asm
= 0;
809 /* -fgnu-linker specifies use of the GNU linker for initializations.
810 (Or, more generally, a linker that handles initializations.)
811 -fno-gnu-linker says that collect2 will be used. */
813 int flag_gnu_linker
= 0;
815 int flag_gnu_linker
= 1;
821 /* Enable dead code elimination. */
822 int flag_ssa_dce
= 0;
824 /* Tag all structures with __attribute__(packed). */
825 int flag_pack_struct
= 0;
827 /* Emit code to check for stack overflow; also may cause large objects
828 to be allocated dynamically. */
829 int flag_stack_check
;
831 /* When non-NULL, indicates that whenever space is allocated on the
832 stack, the resulting stack pointer must not pass this
833 address---that is, for stacks that grow downward, the stack pointer
834 must always be greater than or equal to this address; for stacks
835 that grow upward, the stack pointer must be less than this address.
836 At present, the rtx may be either a REG or a SYMBOL_REF, although
837 the support provided depends on the backend. */
840 /* -fcheck-memory-usage causes extra code to be generated in order to check
841 memory accesses. This is used by a detector of bad memory accesses such
843 int flag_check_memory_usage
= 0;
845 /* -fprefix-function-name causes function name to be prefixed. This
846 can be used with -fcheck-memory-usage to isolate code compiled with
847 -fcheck-memory-usage. */
848 int flag_prefix_function_name
= 0;
850 /* 0 if pointer arguments may alias each other. True in C.
851 1 if pointer arguments may not alias each other but may alias
853 2 if pointer arguments may not alias each other and may not
854 alias global variables. True in Fortran.
855 This defaults to 0 for C. */
856 int flag_argument_noalias
= 0;
858 /* Nonzero if we should do (language-dependent) alias analysis.
859 Typically, this analysis will assume that expressions of certain
860 types do not alias expressions of certain other types. Only used
861 if alias analysis (in general) is enabled. */
862 int flag_strict_aliasing
= 0;
864 /* Instrument functions with calls at entry and exit, for profiling. */
865 int flag_instrument_function_entry_exit
= 0;
867 /* Nonzero means ignore `#ident' directives. 0 means handle them.
868 On SVR4 targets, it also controls whether or not to emit a
869 string identifying the compiler. */
871 int flag_no_ident
= 0;
873 /* This will perform a peephole pass before sched2. */
874 int flag_peephole2
= 0;
876 /* This will try to guess branch probabilities. */
877 int flag_guess_branch_prob
= 0;
879 /* -fbounded-pointers causes gcc to compile pointers as composite
880 objects occupying three words: the pointer value, the base address
881 of the referent object, and the address immediately beyond the end
882 of the referent object. The base and extent allow us to perform
883 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
884 int flag_bounded_pointers
= 0;
886 /* -fcheck-bounds causes gcc to generate array bounds checks.
887 For C, C++: defaults to value of flag_bounded_pointers.
888 For ObjC: defaults to off.
889 For Java: defaults to on.
890 For Fortran: defaults to off.
891 For CHILL: defaults to off. */
892 int flag_bounds_check
= 0;
894 /* If one, renumber instruction UIDs to reduce the number of
895 unused UIDs if there are a lot of instructions. If greater than
896 one, unconditionally renumber instruction UIDs. */
897 int flag_renumber_insns
= 1;
899 /* Values of the -falign-* flags: how much to align labels in code.
900 0 means `use default', 1 means `don't align'.
901 For each variable, there is an _log variant which is the power
902 of two not less than the variable, for .align output. */
909 int align_labels_log
;
911 int align_functions_log
;
913 /* Table of supported debugging formats. */
917 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
918 constant expression, we use NO_DEBUG in its place. */
919 enum debug_info_type debug_type
;
920 int use_extensions_p
;
921 const char *description
;
925 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
926 N_("Generate debugging info in default format") },
927 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
928 #ifdef DBX_DEBUGGING_INFO
929 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
930 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
932 #ifdef DWARF_DEBUGGING_INFO
933 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
934 { "dwarf+", DWARF_DEBUG
, 1,
935 N_("Generate extended DWARF-1 format debug info") },
937 #ifdef DWARF2_DEBUGGING_INFO
938 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
940 #ifdef XCOFF_DEBUGGING_INFO
941 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
942 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
944 #ifdef SDB_DEBUGGING_INFO
945 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
955 const char *description
;
957 lang_independent_options
;
961 /* Add or remove a leading underscore from user symbols. */
962 int flag_leading_underscore
= -1;
964 /* The user symbol prefix after having resolved same. */
965 const char *user_label_prefix
;
967 static const param_info lang_independent_params
[] = {
968 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
969 { OPTION, DEFAULT, HELP },
970 #include "params.def"
975 /* A default for same. */
976 #ifndef USER_LABEL_PREFIX
977 #define USER_LABEL_PREFIX ""
980 /* Table of language-independent -f options.
981 STRING is the option name. VARIABLE is the address of the variable.
982 ON_VALUE is the value to store in VARIABLE
983 if `-fSTRING' is seen as an option.
984 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
986 lang_independent_options f_options
[] =
988 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
989 N_("Perform DWARF2 duplicate elimination") },
990 {"float-store", &flag_float_store
, 1,
991 N_("Do not store floats in registers") },
992 {"volatile", &flag_volatile
, 1,
993 N_("Consider all mem refs through pointers as volatile") },
994 {"volatile-global", &flag_volatile_global
, 1,
995 N_("Consider all mem refs to global data to be volatile") },
996 {"volatile-static", &flag_volatile_static
, 1,
997 N_("Consider all mem refs to static data to be volatile") },
998 {"defer-pop", &flag_defer_pop
, 1,
999 N_("Defer popping functions args from stack until later") },
1000 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1001 N_("When possible do not generate stack frames") },
1002 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1003 N_("Optimize sibling and tail recursive calls") },
1004 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1005 N_("When running CSE, follow jumps to their targets") },
1006 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1007 N_("When running CSE, follow conditional jumps") },
1008 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1009 N_("Perform a number of minor, expensive optimisations") },
1010 {"thread-jumps", &flag_thread_jumps
, 1,
1011 N_("Perform jump threading optimisations") },
1012 {"strength-reduce", &flag_strength_reduce
, 1,
1013 N_("Perform strength reduction optimisations") },
1014 {"unroll-loops", &flag_unroll_loops
, 1,
1015 N_("Perform loop unrolling when iteration count is known") },
1016 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1017 N_("Perform loop unrolling for all loops") },
1018 {"move-all-movables", &flag_move_all_movables
, 1,
1019 N_("Force all loop invariant computations out of loops") },
1020 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1021 N_("Strength reduce all loop general induction variables") },
1022 {"writable-strings", &flag_writable_strings
, 1,
1023 N_("Store strings in writable data section") },
1024 {"peephole", &flag_no_peephole
, 0,
1025 N_("Enable machine specific peephole optimisations") },
1026 {"force-mem", &flag_force_mem
, 1,
1027 N_("Copy memory operands into registers before using") },
1028 {"force-addr", &flag_force_addr
, 1,
1029 N_("Copy memory address constants into regs before using") },
1030 {"function-cse", &flag_no_function_cse
, 0,
1031 N_("Allow function addresses to be held in registers") },
1032 {"inline-functions", &flag_inline_functions
, 1,
1033 N_("Integrate simple functions into their callers") },
1034 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1035 N_("Generate code for funcs even if they are fully inlined") },
1036 {"inline", &flag_no_inline
, 0,
1037 N_("Pay attention to the 'inline' keyword") },
1038 {"keep-static-consts", &flag_keep_static_consts
, 1,
1039 N_("Emit static const variables even if they are not used") },
1040 {"syntax-only", &flag_syntax_only
, 1,
1041 N_("Check for syntax errors, then stop") },
1042 {"shared-data", &flag_shared_data
, 1,
1043 N_("Mark data as shared rather than private") },
1044 {"caller-saves", &flag_caller_saves
, 1,
1045 N_("Enable saving registers around function calls") },
1046 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1047 N_("Return 'short' aggregates in memory, not registers") },
1048 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1049 N_("Return 'short' aggregates in registers") },
1050 {"delayed-branch", &flag_delayed_branch
, 1,
1051 N_("Attempt to fill delay slots of branch instructions") },
1052 {"gcse", &flag_gcse
, 1,
1053 N_("Perform the global common subexpression elimination") },
1054 {"gcse-lm", &flag_gcse_lm
, 1,
1055 N_("Perform enhanced load motion during global subexpression elimination") },
1056 {"gcse-sm", &flag_gcse_sm
, 1,
1057 N_("Perform store motion after global subexpression elimination") },
1058 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1059 N_("Run CSE pass after loop optimisations") },
1060 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1061 N_("Run the loop optimiser twice") },
1062 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1063 N_("Delete useless null pointer checks") },
1064 {"pretend-float", &flag_pretend_float
, 1,
1065 N_("Pretend that host and target use the same FP format") },
1066 {"schedule-insns", &flag_schedule_insns
, 1,
1067 N_("Reschedule instructions before register allocation") },
1068 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1069 N_("Reschedule instructions after register allocation") },
1070 {"sched-interblock",&flag_schedule_interblock
, 1,
1071 N_("Enable scheduling across basic blocks") },
1072 {"sched-spec",&flag_schedule_speculative
, 1,
1073 N_("Allow speculative motion of non-loads") },
1074 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1075 N_("Allow speculative motion of some loads") },
1076 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1077 N_("Allow speculative motion of more loads") },
1078 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1079 N_("Replace add,compare,branch with branch on count reg") },
1080 {"pic", &flag_pic
, 1,
1081 N_("Generate position independent code, if possible") },
1082 {"PIC", &flag_pic
, 2, ""},
1083 {"exceptions", &flag_exceptions
, 1,
1084 N_("Enable exception handling") },
1085 {"unwind-tables", &flag_unwind_tables
, 1,
1086 N_("Just generate unwind tables for exception handling") },
1087 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1088 N_("Support synchronous non-call exceptions") },
1089 {"profile-arcs", &profile_arc_flag
, 1,
1090 N_("Insert arc based program profiling code") },
1091 {"test-coverage", &flag_test_coverage
, 1,
1092 N_("Create data files needed by gcov") },
1093 {"branch-probabilities", &flag_branch_probabilities
, 1,
1094 N_("Use profiling information for branch probabilities") },
1095 {"reorder-blocks", &flag_reorder_blocks
, 1,
1096 N_("Reorder basic blocks to improve code placement") },
1097 {"rename-registers", &flag_rename_registers
, 1,
1098 N_("Do the register renaming optimization pass") },
1099 {"common", &flag_no_common
, 0,
1100 N_("Do not put unitialised globals in the common section") },
1101 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1102 N_("Do not generate .size directives") },
1103 {"function-sections", &flag_function_sections
, 1,
1104 N_("place each function into its own section") },
1105 {"data-sections", &flag_data_sections
, 1,
1106 N_("place data items into their own section") },
1107 {"verbose-asm", &flag_verbose_asm
, 1,
1108 N_("Add extra commentry to assembler output") },
1109 {"gnu-linker", &flag_gnu_linker
, 1,
1110 N_("Output GNU ld formatted global initialisers") },
1111 {"regmove", &flag_regmove
, 1,
1112 N_("Enables a register move optimisation") },
1113 {"optimize-register-move", &flag_regmove
, 1,
1114 N_("Do the full regmove optimization pass") },
1115 {"pack-struct", &flag_pack_struct
, 1,
1116 N_("Pack structure members together without holes") },
1117 {"stack-check", &flag_stack_check
, 1,
1118 N_("Insert stack checking code into the program") },
1119 {"argument-alias", &flag_argument_noalias
, 0,
1120 N_("Specify that arguments may alias each other & globals") },
1121 {"argument-noalias", &flag_argument_noalias
, 1,
1122 N_("Assume arguments may alias globals but not each other") },
1123 {"argument-noalias-global", &flag_argument_noalias
, 2,
1124 N_("Assume arguments do not alias each other or globals") },
1125 {"strict-aliasing", &flag_strict_aliasing
, 1,
1126 N_("Assume strict aliasing rules apply") },
1127 {"align-loops", &align_loops
, 0,
1128 N_("Align the start of loops") },
1129 {"align-jumps", &align_jumps
, 0,
1130 N_("Align labels which are only reached by jumping") },
1131 {"align-labels", &align_labels
, 0,
1132 N_("Align all labels") },
1133 {"align-functions", &align_functions
, 0,
1134 N_("Align the start of functions") },
1135 {"check-memory-usage", &flag_check_memory_usage
, 1,
1136 N_("Generate code to check every memory access") },
1137 {"prefix-function-name", &flag_prefix_function_name
, 1,
1138 N_("Add a prefix to all function names") },
1139 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1140 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1141 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1142 N_("Instrument function entry/exit with profiling calls") },
1143 {"ssa", &flag_ssa
, 1,
1144 N_("Enable SSA optimizations") },
1145 {"ssa-dce", &flag_ssa_dce
, 1,
1146 N_("Enable aggressive SSA dead code elimination") },
1147 {"leading-underscore", &flag_leading_underscore
, 1,
1148 N_("External symbols have a leading underscore") },
1149 {"ident", &flag_no_ident
, 0,
1150 N_("Process #ident directives") },
1151 { "peephole2", &flag_peephole2
, 1,
1152 N_("Enables an rtl peephole pass run before sched2") },
1153 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1154 N_("Enables guessing of branch probabilities") },
1155 {"math-errno", &flag_errno_math
, 1,
1156 N_("Set errno after built-in math functions") },
1157 {"trapping-math", &flag_trapping_math
, 1,
1158 N_("Floating-point operations can trap") },
1159 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1160 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1161 {"bounded-pointers", &flag_bounded_pointers
, 1,
1162 N_("Compile pointers as triples: value, base & end") },
1163 {"bounds-check", &flag_bounds_check
, 1,
1164 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1165 {"single-precision-constant", &flag_single_precision_constant
, 1,
1166 N_("Convert floating point constant to single precision constant") },
1167 {"time-report", &time_report
, 1,
1168 N_("Report time taken by each compiler pass at end of run") },
1169 {"mem-report", &mem_report
, 1,
1170 N_("Report on permanent memory allocation at end of run") },
1171 { "trapv", &flag_trapv
, 1,
1172 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1175 /* Table of language-specific options. */
1177 static struct lang_opt
1180 const char *description
;
1182 documented_lang_options
[] =
1184 /* In order not to overload the --help output, the convention
1185 used here is to only describe those options which are not
1186 enabled by default. */
1189 N_("Compile just for ISO C89") },
1190 { "-fallow-single-precision",
1191 N_("Do not promote floats to double if using -traditional") },
1193 N_("Determine language standard") },
1195 { "-fsigned-bitfields", "" },
1196 { "-funsigned-bitfields",
1197 N_("Make bitfields by unsigned by default") },
1198 { "-fno-signed-bitfields", "" },
1199 { "-fno-unsigned-bitfields","" },
1201 N_("Make 'char' be signed by default") },
1202 { "-funsigned-char",
1203 N_("Make 'char' be unsigned by default") },
1204 { "-fno-signed-char", "" },
1205 { "-fno-unsigned-char", "" },
1207 { "-ftraditional", "" },
1209 N_("Attempt to support traditional K&R style C") },
1210 { "-fnotraditional", "" },
1211 { "-fno-traditional", "" },
1215 N_("Do not recognise the 'asm' keyword") },
1216 { "-fbuiltin", "" },
1218 N_("Do not recognise any built in functions") },
1220 N_("Assume normal C execution environment") },
1221 { "-fno-hosted", "" },
1223 N_("Assume that standard libraries & main might not exist") },
1224 { "-fno-freestanding", "" },
1225 { "-fcond-mismatch",
1226 N_("Allow different types as args of ? operator") },
1227 { "-fno-cond-mismatch", "" },
1228 { "-fdollars-in-identifiers",
1229 N_("Allow the use of $ inside identifiers") },
1230 { "-fno-dollars-in-identifiers", "" },
1231 { "-fpreprocessed", "" },
1232 { "-fno-preprocessed", "" },
1234 N_("Use the same size for double as for float") },
1235 { "-fno-short-double", "" },
1237 N_("Use the smallest fitting integer to hold enums") },
1238 { "-fno-short-enums", "" },
1240 N_("Override the underlying type for wchar_t to `unsigned short'") },
1241 { "-fno-short-wchar", "" },
1244 N_("Enable most warning messages") },
1245 { "-Wbad-function-cast",
1246 N_("Warn about casting functions to incompatible types") },
1247 { "-Wno-bad-function-cast", "" },
1248 { "-Wno-missing-noreturn", "" },
1249 { "-Wmissing-format-attribute",
1250 N_("Warn about functions which might be candidates for format attributes") },
1251 { "-Wno-missing-format-attribute", "" },
1253 N_("Warn about casts which discard qualifiers") },
1254 { "-Wno-cast-qual", "" },
1255 { "-Wchar-subscripts",
1256 N_("Warn about subscripts whose type is 'char'") },
1257 { "-Wno-char-subscripts", "" },
1259 N_("Warn if nested comments are detected") },
1260 { "-Wno-comment", "" },
1262 N_("Warn if nested comments are detected") },
1263 { "-Wno-comments", "" },
1265 N_("Warn about possibly confusing type conversions") },
1266 { "-Wno-conversion", "" },
1268 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1269 { "-Wno-format", "" },
1270 { "-Wformat-y2k", "" },
1271 { "-Wno-format-y2k",
1272 N_("Don't warn about strftime formats yielding 2 digit years") },
1273 { "-Wformat-extra-args", "" },
1274 { "-Wno-format-extra-args",
1275 N_("Don't warn about too many arguments to format functions") },
1276 { "-Wformat-nonliteral",
1277 N_("Warn about non-string-literal format strings") },
1278 { "-Wno-format-nonliteral", "" },
1279 { "-Wformat-security",
1280 N_("Warn about possible security problems with format functions") },
1281 { "-Wno-format-security", "" },
1282 { "-Wimplicit-function-declaration",
1283 N_("Warn about implicit function declarations") },
1284 { "-Wno-implicit-function-declaration", "" },
1285 { "-Werror-implicit-function-declaration", "" },
1287 N_("Warn when a declaration does not specify a type") },
1288 { "-Wno-implicit-int", "" },
1289 { "-Wimplicit", "" },
1290 { "-Wno-implicit", "" },
1292 N_("Warn about the use of the #import directive") },
1293 { "-Wno-import", "" },
1294 { "-Wlong-long","" },
1296 N_("Do not warn about using 'long long' when -pedantic") },
1298 N_("Warn about suspicious declarations of main") },
1299 { "-Wno-main", "" },
1300 { "-Wmissing-braces",
1301 N_("Warn about possibly missing braces around initialisers") },
1302 { "-Wno-missing-braces", "" },
1303 { "-Wmissing-declarations",
1304 N_("Warn about global funcs without previous declarations") },
1305 { "-Wno-missing-declarations", "" },
1306 { "-Wmissing-prototypes",
1307 N_("Warn about global funcs without prototypes") },
1308 { "-Wno-missing-prototypes", "" },
1310 N_("Warn about use of multicharacter literals") },
1311 { "-Wno-multichar", "" },
1312 { "-Wnested-externs",
1313 N_("Warn about externs not at file scope level") },
1314 { "-Wno-nested-externs", "" },
1316 N_("Warn about possible missing parentheses") },
1317 { "-Wno-parentheses", "" },
1318 { "-Wsequence-point",
1319 N_("Warn about possible violations of sequence point rules") },
1320 { "-Wno-sequence-point", "" },
1321 { "-Wpointer-arith",
1322 N_("Warn about function pointer arithmetic") },
1323 { "-Wno-pointer-arith", "" },
1324 { "-Wredundant-decls",
1325 N_("Warn about multiple declarations of the same object") },
1326 { "-Wno-redundant-decls", "" },
1328 N_("Warn about signed/unsigned comparisons") },
1329 { "-Wno-sign-compare", "" },
1331 N_("Warn about testing equality of floating point numbers") },
1332 { "-Wno-float-equal", "" },
1333 { "-Wunknown-pragmas",
1334 N_("Warn about unrecognized pragmas") },
1335 { "-Wno-unknown-pragmas", "" },
1336 { "-Wstrict-prototypes",
1337 N_("Warn about non-prototyped function decls") },
1338 { "-Wno-strict-prototypes", "" },
1340 N_("Warn about constructs whose meaning change in ISO C") },
1341 { "-Wno-traditional", "" },
1343 N_("Warn when trigraphs are encountered") },
1344 { "-Wno-trigraphs", "" },
1346 { "-Wno-undef", "" },
1347 { "-Wwrite-strings",
1348 N_("Mark strings as 'const char *'") },
1349 { "-Wno-write-strings", "" },
1351 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1353 #include "options.h"
1357 /* Here is a table, controlled by the tm.h file, listing each -m switch
1358 and which bits in `target_switches' it should set or clear.
1359 If VALUE is positive, it is bits to set.
1360 If VALUE is negative, -VALUE is bits to clear.
1361 (The sign bit is not used so there is no confusion.) */
1367 const char *description
;
1369 target_switches
[] = TARGET_SWITCHES
;
1371 /* This table is similar, but allows the switch to have a value. */
1373 #ifdef TARGET_OPTIONS
1377 const char **variable
;
1378 const char *description
;
1380 target_options
[] = TARGET_OPTIONS
;
1383 /* Options controlling warnings. */
1385 /* Don't print warning messages. -w. */
1387 int inhibit_warnings
= 0;
1389 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1391 int warn_system_headers
= 0;
1393 /* Print various extra warnings. -W. */
1395 int extra_warnings
= 0;
1397 /* Treat warnings as errors. -Werror. */
1399 int warnings_are_errors
= 0;
1401 /* Nonzero to warn about unused variables, functions et.al. */
1403 int warn_unused_function
;
1404 int warn_unused_label
;
1405 int warn_unused_parameter
;
1406 int warn_unused_variable
;
1407 int warn_unused_value
;
1410 set_Wunused (setting
)
1413 warn_unused_function
= setting
;
1414 warn_unused_label
= setting
;
1415 /* Unused function parameter warnings are reported when either ``-W
1416 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1417 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1419 warn_unused_parameter
= 0;
1420 else if (!warn_unused_parameter
)
1421 warn_unused_parameter
= -1;
1422 warn_unused_variable
= setting
;
1423 warn_unused_value
= setting
;
1426 /* Nonzero to warn about code which is never reached. */
1428 int warn_notreached
;
1430 /* Nonzero to warn about variables used before they are initialized. */
1432 int warn_uninitialized
;
1434 /* Nonzero means warn about all declarations which shadow others. */
1438 /* Warn if a switch on an enum fails to have a case for every enum value. */
1442 /* Nonzero means warn about function definitions that default the return type
1443 or that use a null return and have a return-type other than void. */
1445 int warn_return_type
;
1447 /* Nonzero means warn about pointer casts that increase the required
1448 alignment of the target type (and might therefore lead to a crash
1449 due to a misaligned access). */
1451 int warn_cast_align
;
1453 /* Nonzero means warn about any objects definitions whose size is larger
1454 than N bytes. Also want about function definitions whose returned
1455 values are larger than N bytes. The value N is in `larger_than_size'. */
1457 int warn_larger_than
;
1458 HOST_WIDE_INT larger_than_size
;
1460 /* Nonzero means warn if inline function is too large. */
1464 /* Warn if a function returns an aggregate,
1465 since there are often incompatible calling conventions for doing this. */
1467 int warn_aggregate_return
;
1469 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1473 /* Warn when gcc pads a structure to an alignment boundary. */
1477 /* Warn when an optimization pass is disabled. */
1479 int warn_disabled_optimization
;
1481 /* Warn about functions which might be candidates for attribute noreturn. */
1483 int warn_missing_noreturn
;
1485 /* Likewise for -W. */
1487 lang_independent_options W_options
[] =
1489 {"unused-function", &warn_unused_function
, 1,
1490 N_("Warn when a function is unused") },
1491 {"unused-label", &warn_unused_label
, 1,
1492 N_("Warn when a label is unused") },
1493 {"unused-parameter", &warn_unused_parameter
, 1,
1494 N_("Warn when a function parameter is unused") },
1495 {"unused-variable", &warn_unused_variable
, 1,
1496 N_("Warn when a variable is unused") },
1497 {"unused-value", &warn_unused_value
, 1,
1498 N_("Warn when an expression value is unused") },
1499 {"system-headers", &warn_system_headers
, 1,
1500 N_("Do not suppress warnings from system headers") },
1501 {"error", &warnings_are_errors
, 1,
1502 N_("Treat all warnings as errors") },
1503 {"shadow", &warn_shadow
, 1,
1504 N_("Warn when one local variable shadows another") },
1505 {"switch", &warn_switch
, 1,
1506 N_("Warn about enumerated switches missing a specific case") },
1507 {"aggregate-return", &warn_aggregate_return
, 1,
1508 N_("Warn about returning structures, unions or arrays") },
1509 {"cast-align", &warn_cast_align
, 1,
1510 N_("Warn about pointer casts which increase alignment") },
1511 {"unreachable-code", &warn_notreached
, 1,
1512 N_("Warn about code that will never be executed") },
1513 {"uninitialized", &warn_uninitialized
, 1,
1514 N_("Warn about unitialized automatic variables") },
1515 {"inline", &warn_inline
, 1,
1516 N_("Warn when an inlined function cannot be inlined") },
1517 {"packed", &warn_packed
, 1,
1518 N_("Warn when the packed attribute has no effect on struct layout") },
1519 {"padded", &warn_padded
, 1,
1520 N_("Warn when padding is required to align struct members") },
1521 {"disabled-optimization", &warn_disabled_optimization
, 1,
1522 N_("Warn when an optimization pass is disabled") },
1523 {"missing-noreturn", &warn_missing_noreturn
, 1,
1524 N_("Warn about functions which might be candidates for attribute noreturn") }
1527 /* The following routines are useful in setting all the flags that
1528 -ffast-math and -fno-fast-math imply. */
1531 set_fast_math_flags ()
1533 flag_trapping_math
= 0;
1534 flag_unsafe_math_optimizations
= 1;
1535 flag_errno_math
= 0;
1539 set_no_fast_math_flags ()
1541 flag_trapping_math
= 1;
1542 flag_unsafe_math_optimizations
= 0;
1543 flag_errno_math
= 1;
1547 /* Output files for assembler code (real compiler output)
1548 and debugging dumps. */
1551 FILE *aux_info_file
;
1552 FILE *rtl_dump_file
= NULL
;
1554 /* Decode the string P as an integral parameter.
1555 If the string is indeed an integer return its numeric value else
1556 issue an Invalid Option error for the option PNAME and return DEFVAL.
1557 If PNAME is zero just return DEFVAL, do not call error. */
1560 read_integral_parameter (p
, pname
, defval
)
1565 const char *endp
= p
;
1569 if (*endp
>= '0' && *endp
<= '9')
1578 error ("Invalid option `%s'", pname
);
1586 /* This is the default decl_printable_name function. */
1589 decl_name (decl
, verbosity
)
1591 int verbosity ATTRIBUTE_UNUSED
;
1593 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1597 /* This calls abort and is used to avoid problems when abort if a macro.
1598 It is used when we need to pass the address of abort. */
1606 /* When `malloc.c' is compiled with `rcheck' defined,
1607 it calls this function to report clobberage. */
1611 const char *s ATTRIBUTE_UNUSED
;
1616 /* Return the logarithm of X, base 2, considering X unsigned,
1617 if X is a power of 2. Otherwise, returns -1.
1619 This should be used via the `exact_log2' macro. */
1623 register unsigned HOST_WIDE_INT x
;
1625 register int log
= 0;
1626 /* Test for 0 or a power of 2. */
1627 if (x
== 0 || x
!= (x
& -x
))
1629 while ((x
>>= 1) != 0)
1634 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1635 If X is 0, return -1.
1637 This should be used via the floor_log2 macro. */
1641 register unsigned HOST_WIDE_INT x
;
1643 register int log
= -1;
1650 static int float_handler_set
;
1652 jmp_buf float_handler
;
1654 /* Signals actually come here. */
1657 float_signal (signo
)
1658 /* If this is missing, some compilers complain. */
1659 int signo ATTRIBUTE_UNUSED
;
1661 if (float_handled
== 0)
1662 crash_signal (signo
);
1665 /* On System-V derived systems, we must reinstall the signal handler.
1666 This is harmless on BSD-derived systems. */
1667 signal (SIGFPE
, float_signal
);
1668 longjmp (float_handler
, 1);
1671 /* Specify where to longjmp to when a floating arithmetic error happens.
1672 If HANDLER is 0, it means don't handle the errors any more. */
1675 set_float_handler (handler
)
1678 float_handled
= (handler
!= 0);
1680 memcpy (float_handler
, handler
, sizeof (float_handler
));
1682 if (float_handled
&& ! float_handler_set
)
1684 signal (SIGFPE
, float_signal
);
1685 float_handler_set
= 1;
1689 /* This is a wrapper function for code which might elicit an
1690 arithmetic exception. That code should be passed in as a function
1691 pointer FN, and one argument DATA. DATA is usually a struct which
1692 contains the real input and output for function FN. This function
1693 returns 0 (failure) if longjmp was called (i.e. an exception
1694 occured.) It returns 1 (success) otherwise. */
1697 do_float_handler (fn
, data
)
1698 void (*fn
) PARAMS ((PTR
));
1705 /* We got here via longjmp () caused by an exception in function
1707 set_float_handler (NULL
);
1711 set_float_handler (buf
);
1713 set_float_handler (NULL
);
1717 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1718 into ICE messages, which is much more user friendly. */
1721 crash_signal (signo
)
1724 internal_error ("Internal error: %s", strsignal (signo
));
1727 /* Strip off a legitimate source ending from the input string NAME of
1728 length LEN. Rather than having to know the names used by all of
1729 our front ends, we strip off an ending of a period followed by
1730 up to five characters. (Java uses ".class".) */
1733 strip_off_ending (name
, len
)
1738 for (i
= 2; i
< 6 && len
> i
; i
++)
1740 if (name
[len
- i
] == '.')
1742 name
[len
- i
] = '\0';
1748 /* Output a quoted string. */
1751 output_quoted_string (asm_file
, string
)
1755 #ifdef OUTPUT_QUOTED_STRING
1756 OUTPUT_QUOTED_STRING (asm_file
, string
);
1760 putc ('\"', asm_file
);
1761 while ((c
= *string
++) != 0)
1763 if (c
== '\"' || c
== '\\')
1764 putc ('\\', asm_file
);
1767 putc ('\"', asm_file
);
1771 /* Output a file name in the form wanted by System V. */
1774 output_file_directive (asm_file
, input_name
)
1776 const char *input_name
;
1778 int len
= strlen (input_name
);
1779 const char *na
= input_name
+ len
;
1781 /* NA gets INPUT_NAME sans directory names. */
1782 while (na
> input_name
)
1784 if (IS_DIR_SEPARATOR (na
[-1]))
1789 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1790 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1792 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1793 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1795 fprintf (asm_file
, "\t.file\t");
1796 output_quoted_string (asm_file
, na
);
1797 fputc ('\n', asm_file
);
1802 /* Routine to open a dump file. Return true if the dump file is enabled. */
1805 open_dump_file (index
, decl
)
1806 enum dump_file_index index
;
1810 const char *open_arg
;
1813 if (! dump_file
[index
].enabled
)
1816 timevar_push (TV_DUMP
);
1817 if (rtl_dump_file
!= NULL
)
1818 fclose (rtl_dump_file
);
1820 sprintf (seq
, ".%02d.", index
);
1822 if (! dump_file
[index
].initialized
)
1824 /* If we've not initialized the files, do so now. */
1825 if (graph_dump_format
!= no_graph
1826 && dump_file
[index
].graph_dump_p
)
1828 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1829 clean_graph_dump_file (dump_base_name
, dump_name
);
1832 dump_file
[index
].initialized
= 1;
1838 dump_name
= concat (dump_base_name
, seq
,
1839 dump_file
[index
].extension
, NULL
);
1841 rtl_dump_file
= fopen (dump_name
, open_arg
);
1842 if (rtl_dump_file
== NULL
)
1843 fatal_io_error ("can't open %s", dump_name
);
1848 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1849 decl_printable_name (decl
, 2));
1851 timevar_pop (TV_DUMP
);
1855 /* Routine to close a dump file. */
1858 close_dump_file (index
, func
, insns
)
1859 enum dump_file_index index
;
1860 void (*func
) PARAMS ((FILE *, rtx
));
1863 if (! rtl_dump_file
)
1866 timevar_push (TV_DUMP
);
1868 && graph_dump_format
!= no_graph
1869 && dump_file
[index
].graph_dump_p
)
1874 sprintf (seq
, ".%02d.", index
);
1875 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1876 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1881 func (rtl_dump_file
, insns
);
1883 fflush (rtl_dump_file
);
1884 fclose (rtl_dump_file
);
1886 rtl_dump_file
= NULL
;
1887 timevar_pop (TV_DUMP
);
1890 /* Do any final processing required for the declarations in VEC, of
1891 which there are LEN. We write out inline functions and variables
1892 that have been deferred until this point, but which are required.
1893 Returns non-zero if anything was put out. */
1896 wrapup_global_declarations (vec
, len
)
1903 int output_something
= 0;
1905 for (i
= 0; i
< len
; i
++)
1909 /* We're not deferring this any longer. */
1910 DECL_DEFER_OUTPUT (decl
) = 0;
1912 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1913 && incomplete_decl_finalize_hook
!= 0)
1914 (*incomplete_decl_finalize_hook
) (decl
);
1917 /* Now emit any global variables or functions that we have been
1918 putting off. We need to loop in case one of the things emitted
1919 here references another one which comes earlier in the list. */
1923 for (i
= 0; i
< len
; i
++)
1927 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1930 /* Don't write out static consts, unless we still need them.
1932 We also keep static consts if not optimizing (for debugging),
1933 unless the user specified -fno-keep-static-consts.
1934 ??? They might be better written into the debug information.
1935 This is possible when using DWARF.
1937 A language processor that wants static constants to be always
1938 written out (even if it is not used) is responsible for
1939 calling rest_of_decl_compilation itself. E.g. the C front-end
1940 calls rest_of_decl_compilation from finish_decl.
1941 One motivation for this is that is conventional in some
1942 environments to write things like:
1943 static const char rcsid[] = "... version string ...";
1944 intending to force the string to be in the executable.
1946 A language processor that would prefer to have unneeded
1947 static constants "optimized away" would just defer writing
1948 them out until here. E.g. C++ does this, because static
1949 constants are often defined in header files.
1951 ??? A tempting alternative (for both C and C++) would be
1952 to force a constant to be written if and only if it is
1953 defined in a main file, as opposed to an include file. */
1955 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1956 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1957 && !DECL_COMDAT (decl
))
1959 && flag_keep_static_consts
1960 && !DECL_ARTIFICIAL (decl
))
1961 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1964 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1967 if (TREE_CODE (decl
) == FUNCTION_DECL
1968 && DECL_INITIAL (decl
) != 0
1969 && DECL_SAVED_INSNS (decl
) != 0
1970 && (flag_keep_inline_functions
1971 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1972 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1975 output_inline_function (decl
);
1980 output_something
= 1;
1984 return output_something
;
1987 /* Issue appropriate warnings for the global declarations in VEC (of
1988 which there are LEN). Output debugging information for them. */
1991 check_global_declarations (vec
, len
)
1998 for (i
= 0; i
< len
; i
++)
2002 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2003 && ! TREE_ASM_WRITTEN (decl
))
2004 /* Cancel the RTL for this decl so that, if debugging info
2005 output for global variables is still to come,
2006 this one will be omitted. */
2007 SET_DECL_RTL (decl
, NULL_RTX
);
2009 /* Warn about any function
2010 declared static but not defined.
2011 We don't warn about variables,
2012 because many programs have static variables
2013 that exist only to get some text into the object file. */
2014 if (TREE_CODE (decl
) == FUNCTION_DECL
2015 && (warn_unused_function
2016 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2017 && DECL_INITIAL (decl
) == 0
2018 && DECL_EXTERNAL (decl
)
2019 && ! DECL_ARTIFICIAL (decl
)
2020 && ! TREE_PUBLIC (decl
))
2022 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2023 pedwarn_with_decl (decl
,
2024 "`%s' used but never defined");
2026 warning_with_decl (decl
,
2027 "`%s' declared `static' but never defined");
2028 /* This symbol is effectively an "extern" declaration now. */
2029 TREE_PUBLIC (decl
) = 1;
2030 assemble_external (decl
);
2033 /* Warn about static fns or vars defined but not used,
2034 but not about inline functions or static consts
2035 since defining those in header files is normal practice. */
2036 if (((warn_unused_function
2037 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2038 || (warn_unused_variable
2039 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2040 && ! DECL_IN_SYSTEM_HEADER (decl
)
2041 && ! DECL_EXTERNAL (decl
)
2042 && ! TREE_PUBLIC (decl
)
2043 && ! TREE_USED (decl
)
2044 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2045 /* The TREE_USED bit for file-scope decls
2046 is kept in the identifier, to handle multiple
2047 external decls in different scopes. */
2048 && ! TREE_USED (DECL_NAME (decl
)))
2049 warning_with_decl (decl
, "`%s' defined but not used");
2051 timevar_push (TV_SYMOUT
);
2052 #ifdef SDB_DEBUGGING_INFO
2053 /* The COFF linker can move initialized global vars to the end.
2054 And that can screw up the symbol ordering.
2055 By putting the symbols in that order to begin with,
2056 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2057 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2058 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2059 && ! DECL_EXTERNAL (decl
)
2060 && DECL_RTL (decl
) != 0)
2061 sdbout_symbol (decl
, 0);
2063 /* Output COFF information for non-global
2064 file-scope initialized variables. */
2065 if (write_symbols
== SDB_DEBUG
2066 && TREE_CODE (decl
) == VAR_DECL
2067 && DECL_INITIAL (decl
)
2068 && ! DECL_EXTERNAL (decl
)
2069 && DECL_RTL (decl
) != 0
2070 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2071 sdbout_toplevel_data (decl
);
2072 #endif /* SDB_DEBUGGING_INFO */
2073 #ifdef DWARF_DEBUGGING_INFO
2074 /* Output DWARF information for file-scope tentative data object
2075 declarations, file-scope (extern) function declarations (which
2076 had no corresponding body) and file-scope tagged type declarations
2077 and definitions which have not yet been forced out. */
2079 if (write_symbols
== DWARF_DEBUG
2080 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2081 dwarfout_file_scope_decl (decl
, 1);
2083 #ifdef DWARF2_DEBUGGING_INFO
2084 /* Output DWARF2 information for file-scope tentative data object
2085 declarations, file-scope (extern) function declarations (which
2086 had no corresponding body) and file-scope tagged type declarations
2087 and definitions which have not yet been forced out. */
2089 if (write_symbols
== DWARF2_DEBUG
2090 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2091 dwarf2out_decl (decl
);
2093 timevar_pop (TV_SYMOUT
);
2097 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2098 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2099 INPUT_FILENAME and LINENO accordingly. */
2102 push_srcloc (file
, line
)
2106 struct file_stack
*fs
;
2108 if (input_file_stack
)
2110 input_file_stack
->name
= input_filename
;
2111 input_file_stack
->line
= lineno
;
2114 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2115 fs
->name
= input_filename
= file
;
2116 fs
->line
= lineno
= line
;
2117 fs
->indent_level
= 0;
2118 fs
->next
= input_file_stack
;
2119 input_file_stack
= fs
;
2120 input_file_stack_tick
++;
2123 /* Pop the top entry off the stack of presently open source files.
2124 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2130 struct file_stack
*fs
;
2132 fs
= input_file_stack
;
2133 input_file_stack
= fs
->next
;
2135 input_file_stack_tick
++;
2136 /* The initial source file is never popped. */
2137 if (!input_file_stack
)
2139 input_filename
= input_file_stack
->name
;
2140 lineno
= input_file_stack
->line
;
2143 /* Compile an entire file of output from cpp, named NAME.
2144 Write a file of assembly output and various debugging dumps. */
2152 int name_specified
= name
!= 0;
2154 if (dump_base_name
== 0)
2155 dump_base_name
= name
? name
: "gccdump";
2160 /* Start timing total execution time. */
2163 timevar_start (TV_TOTAL
);
2165 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2166 because then the driver will have provided the name of a temporary
2167 file or bit bucket for us. */
2169 if (! name_specified
&& asm_file_name
== 0)
2170 asm_out_file
= stdout
;
2173 if (asm_file_name
== 0)
2175 int len
= strlen (dump_base_name
);
2176 char *dumpname
= (char *) xmalloc (len
+ 6);
2177 memcpy (dumpname
, dump_base_name
, len
+ 1);
2178 strip_off_ending (dumpname
, len
);
2179 strcat (dumpname
, ".s");
2180 asm_file_name
= dumpname
;
2182 if (!strcmp (asm_file_name
, "-"))
2183 asm_out_file
= stdout
;
2185 asm_out_file
= fopen (asm_file_name
, "w");
2186 if (asm_out_file
== 0)
2187 fatal_io_error ("can't open %s for writing", asm_file_name
);
2190 /* Initialize data in various passes. */
2193 name
= init_parse (name
);
2194 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2195 || debug_info_level
== DINFO_LEVEL_VERBOSE
2196 || flag_test_coverage
2197 || warn_notreached
);
2200 init_decl_processing ();
2206 init_function_once ();
2207 init_stor_layout_once ();
2208 init_varasm_once ();
2209 init_EXPR_INSN_LIST_cache ();
2211 /* The following initialization functions need to generate rtl, so
2212 provide a dummy function context for them. */
2213 init_dummy_function_start ();
2216 if (flag_caller_saves
)
2217 init_caller_save ();
2218 expand_dummy_function_end ();
2220 /* If auxiliary info generation is desired, open the output file.
2221 This goes in the same directory as the source file--unlike
2222 all the other output files. */
2223 if (flag_gen_aux_info
)
2225 aux_info_file
= fopen (aux_info_file_name
, "w");
2226 if (aux_info_file
== 0)
2227 fatal_io_error ("can't open %s", aux_info_file_name
);
2230 #ifdef IO_BUFFER_SIZE
2231 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2232 _IOFBF
, IO_BUFFER_SIZE
);
2236 name
= ggc_strdup (name
);
2238 input_filename
= name
;
2240 /* Put an entry on the input file stack for the main input file. */
2241 push_srcloc (input_filename
, 0);
2243 /* Perform language-specific initialization.
2244 This may set main_input_filename. */
2245 if (lang_hooks
.init
)
2246 (*lang_hooks
.init
) ();
2248 /* If the input doesn't start with a #line, use the input name
2249 as the official input file name. */
2250 if (main_input_filename
== 0)
2251 main_input_filename
= name
;
2253 if (flag_syntax_only
)
2255 write_symbols
= NO_DEBUG
;
2257 profile_block_flag
= 0;
2261 ASM_FILE_START (asm_out_file
);
2263 #ifdef ASM_COMMENT_START
2264 if (flag_verbose_asm
)
2266 /* Print the list of options in effect. */
2267 print_version (asm_out_file
, ASM_COMMENT_START
);
2268 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2269 ASM_COMMENT_START
, " ", "\n");
2270 /* Add a blank line here so it appears in assembler output but not
2272 fprintf (asm_out_file
, "\n");
2275 } /* ! flag_syntax_only */
2277 #ifndef ASM_OUTPUT_SECTION_NAME
2278 if (flag_function_sections
)
2280 warning ("-ffunction-sections not supported for this target.");
2281 flag_function_sections
= 0;
2283 if (flag_data_sections
)
2285 warning ("-fdata-sections not supported for this target.");
2286 flag_data_sections
= 0;
2290 if (flag_function_sections
2291 && (profile_flag
|| profile_block_flag
))
2293 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2294 flag_function_sections
= 0;
2297 #ifndef OBJECT_FORMAT_ELF
2298 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2299 warning ("-ffunction-sections may affect debugging on some targets.");
2302 /* If dbx symbol table desired, initialize writing it
2303 and output the predefined types. */
2304 timevar_push (TV_SYMOUT
);
2305 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2306 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2307 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2309 #ifdef SDB_DEBUGGING_INFO
2310 if (write_symbols
== SDB_DEBUG
)
2311 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2313 #ifdef DWARF_DEBUGGING_INFO
2314 if (write_symbols
== DWARF_DEBUG
)
2315 dwarfout_init (asm_out_file
, main_input_filename
);
2317 #ifdef DWARF2_UNWIND_INFO
2318 if (dwarf2out_do_frame ())
2319 dwarf2out_frame_init ();
2321 #ifdef DWARF2_DEBUGGING_INFO
2322 if (write_symbols
== DWARF2_DEBUG
)
2323 dwarf2out_init (asm_out_file
, main_input_filename
);
2325 timevar_pop (TV_SYMOUT
);
2327 /* Initialize yet another pass. */
2329 init_final (main_input_filename
);
2330 init_branch_prob (dump_base_name
);
2332 timevar_push (TV_PARSE
);
2334 /* Call the parser, which parses the entire file
2335 (calling rest_of_compilation for each function). */
2337 if (yyparse () != 0)
2339 if (errorcount
== 0)
2340 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2342 /* In case there were missing closebraces,
2343 get us back to the global binding level. */
2344 while (! global_bindings_p ())
2348 /* Compilation is now finished except for writing
2349 what's left of the symbol table output. */
2351 timevar_pop (TV_PARSE
);
2353 if (flag_syntax_only
)
2356 globals
= getdecls ();
2358 /* Really define vars that have had only a tentative definition.
2359 Really output inline functions that must actually be callable
2360 and have not been output so far. */
2363 int len
= list_length (globals
);
2364 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2368 /* Process the decls in reverse order--earliest first.
2369 Put them into VEC from back to front, then take out from front. */
2371 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2372 vec
[len
- i
- 1] = decl
;
2374 wrapup_global_declarations (vec
, len
);
2376 /* This must occur after the loop to output deferred functions. Else
2377 the profiler initializer would not be emitted if all the functions
2378 in this compilation unit were deferred.
2380 output_func_start_profiler can not cause any additional functions or
2381 data to need to be output, so it need not be in the deferred function
2383 output_func_start_profiler ();
2385 check_global_declarations (vec
, len
);
2391 /* Write out any pending weak symbol declarations. */
2395 /* Do dbx symbols. */
2396 timevar_push (TV_SYMOUT
);
2397 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2398 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2399 dbxout_finish (asm_out_file
, main_input_filename
);
2402 #ifdef DWARF_DEBUGGING_INFO
2403 if (write_symbols
== DWARF_DEBUG
)
2407 #ifdef DWARF2_UNWIND_INFO
2408 if (dwarf2out_do_frame ())
2409 dwarf2out_frame_finish ();
2412 #ifdef DWARF2_DEBUGGING_INFO
2413 if (write_symbols
== DWARF2_DEBUG
)
2414 dwarf2out_finish ();
2416 timevar_pop (TV_SYMOUT
);
2418 /* Output some stuff at end of file if nec. */
2420 dw2_output_indirect_constants ();
2422 end_final (dump_base_name
);
2424 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2426 timevar_push (TV_DUMP
);
2427 open_dump_file (DFI_bp
, NULL
);
2431 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2432 timevar_pop (TV_DUMP
);
2436 ASM_FILE_END (asm_out_file
);
2439 /* Attach a special .ident directive to the end of the file to identify
2440 the version of GCC which compiled this code. The format of the .ident
2441 string is patterned after the ones produced by native SVR4 compilers. */
2444 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2445 IDENT_ASM_OP
, version_string
);
2448 /* Language-specific end of compilation actions. */
2450 if (lang_hooks
.finish
)
2451 (*lang_hooks
.finish
) ();
2453 /* Close the dump files. */
2455 if (flag_gen_aux_info
)
2457 fclose (aux_info_file
);
2459 unlink (aux_info_file_name
);
2462 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2464 timevar_push (TV_DUMP
);
2465 dump_combine_total_stats (rtl_dump_file
);
2466 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2467 timevar_pop (TV_DUMP
);
2470 /* Close non-debugging input and output files. Take special care to note
2471 whether fclose returns an error, since the pages might still be on the
2472 buffer chain while the file is open. */
2476 if (ferror (asm_out_file
) != 0)
2477 fatal_io_error ("error writing to %s", asm_file_name
);
2478 if (fclose (asm_out_file
) != 0)
2479 fatal_io_error ("error closing %s", asm_file_name
);
2481 /* Do whatever is necessary to finish printing the graphs. */
2482 if (graph_dump_format
!= no_graph
)
2486 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2487 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2492 sprintf (seq
, ".%02d.", i
);
2493 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2494 finish_graph_dump_file (dump_base_name
, suffix
);
2501 ggc_print_statistics ();
2502 stringpool_statistics ();
2505 /* Free up memory for the benefit of leak detectors. */
2508 /* Stop timing total execution time. */
2509 timevar_stop (TV_TOTAL
);
2511 /* Print the times. */
2513 timevar_print (stderr
);
2516 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2517 and TYPE_DECL nodes.
2519 This does nothing for local (non-static) variables, unless the
2520 variable is a register variable with an ASMSPEC. In that case, or
2521 if the variable is not an automatic, it sets up the RTL and
2522 outputs any assembler code (label definition, storage allocation
2523 and initialization).
2525 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2526 the assembler symbol name to be used. TOP_LEVEL is nonzero
2527 if this declaration is not within a function. */
2530 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2532 const char *asmspec
;
2536 /* Declarations of variables, and of functions defined elsewhere. */
2538 /* The most obvious approach, to put an #ifndef around where
2539 this macro is used, doesn't work since it's inside a macro call. */
2540 #ifndef ASM_FINISH_DECLARE_OBJECT
2541 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2544 /* Forward declarations for nested functions are not "external",
2545 but we need to treat them as if they were. */
2546 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2547 || TREE_CODE (decl
) == FUNCTION_DECL
)
2549 timevar_push (TV_VARCONST
);
2551 make_decl_rtl (decl
, asmspec
);
2552 /* Don't output anything
2553 when a tentative file-scope definition is seen.
2554 But at end of compilation, do output code for them. */
2555 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2556 assemble_variable (decl
, top_level
, at_end
, 0);
2557 if (decl
== last_assemble_variable_decl
)
2559 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2562 timevar_pop (TV_VARCONST
);
2564 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2566 if (decode_reg_name (asmspec
) >= 0)
2568 SET_DECL_RTL (decl
, NULL_RTX
);
2569 make_decl_rtl (decl
, asmspec
);
2573 error ("invalid register name `%s' for register variable", asmspec
);
2574 DECL_REGISTER (decl
) = 0;
2579 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2580 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2581 && TREE_CODE (decl
) == TYPE_DECL
)
2583 timevar_push (TV_SYMOUT
);
2584 dbxout_symbol (decl
, 0);
2585 timevar_pop (TV_SYMOUT
);
2588 #ifdef SDB_DEBUGGING_INFO
2589 else if (write_symbols
== SDB_DEBUG
&& top_level
2590 && TREE_CODE (decl
) == TYPE_DECL
)
2592 timevar_push (TV_SYMOUT
);
2593 sdbout_symbol (decl
, 0);
2594 timevar_pop (TV_SYMOUT
);
2599 /* Called after finishing a record, union or enumeral type. */
2602 rest_of_type_compilation (type
, toplev
)
2603 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2607 tree type ATTRIBUTE_UNUSED
;
2608 int toplev ATTRIBUTE_UNUSED
;
2611 timevar_push (TV_SYMOUT
);
2612 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2613 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2614 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2616 #ifdef SDB_DEBUGGING_INFO
2617 if (write_symbols
== SDB_DEBUG
)
2618 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2620 #ifdef DWARF2_DEBUGGING_INFO
2621 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2622 dwarf2out_decl (TYPE_STUB_DECL (type
));
2624 timevar_pop (TV_SYMOUT
);
2627 /* DECL is an inline function, whose body is present, but which is not
2628 being output at this point. (We're putting that off until we need
2629 to do it.) If there are any actions that need to take place,
2630 including the emission of debugging information for the function,
2631 this is where they should go. This function may be called by
2632 language-dependent code for front-ends that do not even generate
2633 RTL for functions that don't need to be put out. */
2636 note_deferral_of_defined_inline_function (decl
)
2637 tree decl ATTRIBUTE_UNUSED
;
2639 #ifdef DWARF_DEBUGGING_INFO
2640 /* Generate the DWARF info for the "abstract" instance of a function
2641 which we may later generate inlined and/or out-of-line instances
2643 if (write_symbols
== DWARF_DEBUG
2644 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2645 && ! DECL_ABSTRACT_ORIGIN (decl
))
2647 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2648 DWARF code expects it to be set in this case. Intuitively,
2649 DECL is the function we just finished defining, so setting
2650 CURRENT_FUNCTION_DECL is sensible. */
2651 tree saved_cfd
= current_function_decl
;
2652 int was_abstract
= DECL_ABSTRACT (decl
);
2653 current_function_decl
= decl
;
2655 /* Let the DWARF code do its work. */
2656 set_decl_abstract_flags (decl
, 1);
2657 dwarfout_file_scope_decl (decl
, 0);
2659 set_decl_abstract_flags (decl
, 0);
2661 /* Reset CURRENT_FUNCTION_DECL. */
2662 current_function_decl
= saved_cfd
;
2667 /* FNDECL is an inline function which is about to be emitted out of line.
2668 Do any preparation, such as emitting abstract debug info for the inline
2669 before it gets mangled by optimization. */
2672 note_outlining_of_inline_function (fndecl
)
2673 tree fndecl ATTRIBUTE_UNUSED
;
2675 #ifdef DWARF2_DEBUGGING_INFO
2676 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2677 the abstract description of inline functions until something tries to
2678 reference them. Force it out now, before optimizations mangle the
2680 if (write_symbols
== DWARF2_DEBUG
)
2681 dwarf2out_abstract_function (fndecl
);
2685 /* This is called from finish_function (within yyparse)
2686 after each top-level definition is parsed.
2687 It is supposed to compile that function or variable
2688 and output the assembler code for it.
2689 After we return, the tree storage is freed. */
2692 rest_of_compilation (decl
)
2698 int rebuild_label_notes_after_reload
;
2699 int register_life_up_to_date
;
2701 timevar_push (TV_REST_OF_COMPILATION
);
2703 /* Now that we're out of the frontend, we shouldn't have any more
2704 CONCATs anywhere. */
2705 generating_concat_p
= 0;
2707 /* When processing delayed functions, prepare_function_start() won't
2708 have been run to re-initialize it. */
2709 cse_not_expected
= ! optimize
;
2711 /* First, make sure that NOTE_BLOCK is set correctly for each
2712 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2713 if (!cfun
->x_whole_function_mode_p
)
2716 /* Then remove any notes we don't need. That will make iterating
2717 over the instruction sequence faster, and allow the garbage
2718 collector to reclaim the memory used by the notes. */
2719 remove_unnecessary_notes ();
2721 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2722 tree in sensible shape. So, we just recalculate it here. */
2723 if (cfun
->x_whole_function_mode_p
)
2728 /* If we are reconsidering an inline function
2729 at the end of compilation, skip the stuff for making it inline. */
2731 if (DECL_SAVED_INSNS (decl
) == 0)
2737 /* If this is nested inside an inlined external function, pretend
2738 it was only declared. Since we cannot inline such functions,
2739 generating code for this one is not only not necessary but will
2740 confuse some debugging output writers. */
2741 for (parent
= DECL_CONTEXT (current_function_decl
);
2742 parent
!= NULL_TREE
;
2743 parent
= get_containing_scope (parent
))
2744 if (TREE_CODE (parent
) == FUNCTION_DECL
2745 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2747 DECL_INITIAL (decl
) = 0;
2748 goto exit_rest_of_compilation
;
2751 /* If requested, consider whether to make this function inline. */
2752 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2753 || flag_inline_functions
)
2755 timevar_push (TV_INTEGRATION
);
2756 lose
= function_cannot_inline_p (decl
);
2757 timevar_pop (TV_INTEGRATION
);
2758 if (lose
|| ! optimize
)
2760 if (warn_inline
&& DECL_INLINE (decl
))
2761 warning_with_decl (decl
, lose
);
2762 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2763 /* Don't really compile an extern inline function.
2764 If we can't make it inline, pretend
2765 it was only declared. */
2766 if (DECL_EXTERNAL (decl
))
2768 DECL_INITIAL (decl
) = 0;
2769 goto exit_rest_of_compilation
;
2773 /* ??? Note that this has the effect of making it look
2774 like "inline" was specified for a function if we choose
2775 to inline it. This isn't quite right, but it's
2776 probably not worth the trouble to fix. */
2777 inlinable
= DECL_INLINE (decl
) = 1;
2780 insns
= get_insns ();
2782 /* Dump the rtl code if we are dumping rtl. */
2784 if (open_dump_file (DFI_rtl
, decl
))
2786 if (DECL_SAVED_INSNS (decl
))
2787 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2788 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2791 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2792 sorts of eh initialization. Delay this until after the
2793 initial rtl dump so that we can see the original nesting. */
2794 convert_from_eh_region_ranges ();
2796 /* If function is inline, and we don't yet know whether to
2797 compile it by itself, defer decision till end of compilation.
2798 finish_compilation will call rest_of_compilation again
2799 for those functions that need to be output. Also defer those
2800 functions that we are supposed to defer. */
2803 || (DECL_INLINE (decl
)
2804 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2805 && ! flag_keep_inline_functions
)
2806 || DECL_EXTERNAL (decl
))))
2807 DECL_DEFER_OUTPUT (decl
) = 1;
2809 if (DECL_INLINE (decl
))
2810 /* DWARF wants seperate debugging info for abstract and
2811 concrete instances of all inline functions, including those
2812 declared inline but not inlined, and those inlined even
2813 though they weren't declared inline. Conveniently, that's
2814 what DECL_INLINE means at this point. */
2815 note_deferral_of_defined_inline_function (decl
);
2817 if (DECL_DEFER_OUTPUT (decl
))
2819 /* If -Wreturn-type, we have to do a bit of compilation. We just
2820 want to call jump_optimize to figure out whether or not we can
2821 fall off the end of the function; we do the minimum amount of
2822 work necessary to make that safe. And, we set optimize to zero
2823 to keep jump_optimize from working too hard. */
2824 if (warn_return_type
)
2826 int saved_optimize
= optimize
;
2829 find_exception_handler_labels ();
2830 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2831 !JUMP_AFTER_REGSCAN
);
2832 optimize
= saved_optimize
;
2835 current_function_nothrow
= nothrow_function_p ();
2836 if (current_function_nothrow
)
2837 /* Now we know that this can't throw; set the flag for the benefit
2838 of other functions later in this translation unit. */
2839 TREE_NOTHROW (current_function_decl
) = 1;
2841 timevar_push (TV_INTEGRATION
);
2842 save_for_inline (decl
);
2843 timevar_pop (TV_INTEGRATION
);
2844 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2845 goto exit_rest_of_compilation
;
2848 /* If specified extern inline but we aren't inlining it, we are
2849 done. This goes for anything that gets here with DECL_EXTERNAL
2850 set, not just things with DECL_INLINE. */
2851 if (DECL_EXTERNAL (decl
))
2852 goto exit_rest_of_compilation
;
2857 /* Initialize some variables used by the optimizers. */
2858 init_function_for_compilation ();
2860 if (! DECL_DEFER_OUTPUT (decl
))
2861 TREE_ASM_WRITTEN (decl
) = 1;
2863 /* Now that integrate will no longer see our rtl, we need not
2864 distinguish between the return value of this function and the
2865 return value of called functions. Also, we can remove all SETs
2866 of subregs of hard registers; they are only here because of
2867 integrate. Also, we can now initialize pseudos intended to
2868 carry magic hard reg data throughout the function. */
2869 rtx_equal_function_value_matters
= 0;
2870 purge_hard_subreg_sets (get_insns ());
2871 emit_initial_value_sets ();
2873 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2874 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2875 goto exit_rest_of_compilation
;
2877 /* We may have potential sibling or tail recursion sites. Select one
2878 (of possibly multiple) methods of performing the call. */
2879 if (flag_optimize_sibling_calls
)
2881 timevar_push (TV_JUMP
);
2882 open_dump_file (DFI_sibling
, decl
);
2884 optimize_sibling_and_tail_recursive_calls ();
2886 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2887 timevar_pop (TV_JUMP
);
2890 /* Complete generation of exception handling code. */
2891 find_exception_handler_labels ();
2894 timevar_push (TV_JUMP
);
2895 open_dump_file (DFI_eh
, decl
);
2897 finish_eh_generation ();
2899 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2900 timevar_pop (TV_JUMP
);
2904 /* If we are doing position-independent code generation, now
2905 is the time to output special prologues and epilogues.
2906 We do not want to do this earlier, because it just clutters
2907 up inline functions with meaningless insns. */
2912 insns
= get_insns ();
2914 /* Copy any shared structure that should not be shared. */
2915 unshare_all_rtl (current_function_decl
, insns
);
2917 #ifdef SETJMP_VIA_SAVE_AREA
2918 /* This must be performed before virutal register instantiation. */
2919 if (current_function_calls_alloca
)
2920 optimize_save_area_alloca (insns
);
2923 /* Instantiate all virtual registers. */
2924 instantiate_virtual_regs (current_function_decl
, insns
);
2926 open_dump_file (DFI_jump
, decl
);
2928 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2929 are initialized and to compute whether control can drop off the end
2932 timevar_push (TV_JUMP
);
2933 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2934 before jump optimization switches branch directions. */
2935 expected_value_to_br_prob ();
2937 reg_scan (insns
, max_reg_num (), 0);
2938 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2939 JUMP_AFTER_REGSCAN
);
2941 timevar_pop (TV_JUMP
);
2943 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2944 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2946 close_dump_file (DFI_jump
, print_rtl
, insns
);
2947 goto exit_rest_of_compilation
;
2950 /* Long term, this should probably move before the jump optimizer too,
2951 but I didn't want to disturb the rtl_dump_and_exit and related
2952 stuff at this time. */
2953 if (optimize
> 0 && flag_ssa
)
2955 /* Convert to SSA form. */
2957 timevar_push (TV_TO_SSA
);
2958 open_dump_file (DFI_ssa
, decl
);
2960 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2964 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2965 timevar_pop (TV_TO_SSA
);
2967 /* The SSA implementation uses basic block numbers in its phi
2968 nodes. Thus, changing the control-flow graph or the basic
2969 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2970 may cause problems. */
2974 /* Remove dead code. */
2976 timevar_push (TV_SSA_DCE
);
2977 open_dump_file (DFI_ssa_dce
, decl
);
2979 insns
= get_insns ();
2980 ssa_eliminate_dead_code();
2982 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2983 timevar_pop (TV_SSA_DCE
);
2986 /* Convert from SSA form. */
2988 timevar_push (TV_FROM_SSA
);
2989 open_dump_file (DFI_ussa
, decl
);
2991 convert_from_ssa ();
2992 /* New registers have been created. Rescan their usage. */
2993 reg_scan (insns
, max_reg_num (), 1);
2994 /* Life analysis used in SSA adds log_links but these
2995 shouldn't be there until the flow stage, so clear
2997 clear_log_links (insns
);
2999 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3000 timevar_pop (TV_FROM_SSA
);
3005 timevar_push (TV_JUMP
);
3009 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3012 /* ??? Run if-conversion before delete_null_pointer_checks,
3013 since the later does not preserve the CFG. This should
3014 be changed -- no since converting if's that are going to
3016 timevar_push (TV_IFCVT
);
3018 timevar_pop (TV_IFCVT
);
3020 /* Try to identify useless null pointer tests and delete them. */
3021 if (flag_delete_null_pointer_checks
)
3022 delete_null_pointer_checks (insns
);
3025 /* Jump optimization, and the removal of NULL pointer checks, may
3026 have reduced the number of instructions substantially. CSE, and
3027 future passes, allocate arrays whose dimensions involve the
3028 maximum instruction UID, so if we can reduce the maximum UID
3029 we'll save big on memory. */
3030 renumber_insns (rtl_dump_file
);
3031 timevar_pop (TV_JUMP
);
3033 close_dump_file (DFI_jump
, print_rtl
, insns
);
3037 /* Perform common subexpression elimination.
3038 Nonzero value from `cse_main' means that jumps were simplified
3039 and some code may now be unreachable, so do
3040 jump optimization again. */
3044 open_dump_file (DFI_cse
, decl
);
3045 timevar_push (TV_CSE
);
3047 reg_scan (insns
, max_reg_num (), 1);
3049 if (flag_thread_jumps
)
3051 timevar_push (TV_JUMP
);
3052 thread_jumps (insns
, max_reg_num (), 1);
3053 timevar_pop (TV_JUMP
);
3056 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3058 /* If we are not running more CSE passes, then we are no longer
3059 expecting CSE to be run. But always rerun it in a cheap mode. */
3060 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3062 if (tem
|| optimize
> 1)
3064 timevar_push (TV_JUMP
);
3065 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3066 !JUMP_AFTER_REGSCAN
);
3067 timevar_pop (TV_JUMP
);
3070 /* Run this after jump optmizations remove all the unreachable code
3071 so that unreachable code will not keep values live. */
3072 delete_trivially_dead_insns (insns
, max_reg_num ());
3074 /* Try to identify useless null pointer tests and delete them. */
3075 if (flag_delete_null_pointer_checks
)
3077 timevar_push (TV_JUMP
);
3078 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3082 delete_null_pointer_checks (insns
);
3083 timevar_pop (TV_JUMP
);
3086 /* The second pass of jump optimization is likely to have
3087 removed a bunch more instructions. */
3088 renumber_insns (rtl_dump_file
);
3090 timevar_pop (TV_CSE
);
3091 close_dump_file (DFI_cse
, print_rtl
, insns
);
3094 open_dump_file (DFI_addressof
, decl
);
3096 purge_addressof (insns
);
3097 reg_scan (insns
, max_reg_num (), 1);
3099 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3103 /* Perform global cse. */
3105 if (optimize
> 0 && flag_gcse
)
3107 int save_csb
, save_cfj
;
3110 timevar_push (TV_GCSE
);
3111 open_dump_file (DFI_gcse
, decl
);
3113 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3115 tem
= gcse_main (insns
, rtl_dump_file
);
3117 save_csb
= flag_cse_skip_blocks
;
3118 save_cfj
= flag_cse_follow_jumps
;
3119 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3121 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3123 if (flag_expensive_optimizations
)
3125 timevar_push (TV_CSE
);
3126 reg_scan (insns
, max_reg_num (), 1);
3127 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3128 timevar_pop (TV_CSE
);
3129 cse_not_expected
= !flag_rerun_cse_after_loop
;
3132 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3133 things up. Then possibly re-run CSE again. */
3137 timevar_push (TV_JUMP
);
3138 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3139 !JUMP_AFTER_REGSCAN
);
3140 timevar_pop (TV_JUMP
);
3142 if (flag_expensive_optimizations
)
3144 timevar_push (TV_CSE
);
3145 reg_scan (insns
, max_reg_num (), 1);
3146 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3147 timevar_pop (TV_CSE
);
3151 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3152 timevar_pop (TV_GCSE
);
3155 flag_cse_skip_blocks
= save_csb
;
3156 flag_cse_follow_jumps
= save_cfj
;
3159 /* Move constant computations out of loops. */
3163 timevar_push (TV_LOOP
);
3164 open_dump_file (DFI_loop
, decl
);
3166 if (flag_rerun_loop_opt
)
3168 /* We only want to perform unrolling once. */
3170 loop_optimize (insns
, rtl_dump_file
, 0);
3172 /* The first call to loop_optimize makes some instructions
3173 trivially dead. We delete those instructions now in the
3174 hope that doing so will make the heuristics in loop work
3175 better and possibly speed up compilation. */
3176 delete_trivially_dead_insns (insns
, max_reg_num ());
3178 /* The regscan pass is currently necessary as the alias
3179 analysis code depends on this information. */
3180 reg_scan (insns
, max_reg_num (), 1);
3182 loop_optimize (insns
, rtl_dump_file
,
3183 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3185 close_dump_file (DFI_loop
, print_rtl
, insns
);
3186 timevar_pop (TV_LOOP
);
3193 timevar_push (TV_CSE2
);
3194 open_dump_file (DFI_cse2
, decl
);
3196 if (flag_rerun_cse_after_loop
)
3198 /* Running another jump optimization pass before the second
3199 cse pass sometimes simplifies the RTL enough to allow
3200 the second CSE pass to do a better job. Jump_optimize can change
3201 max_reg_num so we must rerun reg_scan afterwards.
3202 ??? Rework to not call reg_scan so often. */
3203 timevar_push (TV_JUMP
);
3205 /* The previous call to loop_optimize makes some instructions
3206 trivially dead. We delete those instructions now in the
3207 hope that doing so will make the heuristics in jump work
3208 better and possibly speed up compilation. */
3209 delete_trivially_dead_insns (insns
, max_reg_num ());
3211 reg_scan (insns
, max_reg_num (), 0);
3212 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3213 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3215 timevar_push (TV_IFCVT
);
3217 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3221 timevar_pop(TV_IFCVT
);
3223 timevar_pop (TV_JUMP
);
3225 reg_scan (insns
, max_reg_num (), 0);
3226 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3230 timevar_push (TV_JUMP
);
3231 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3232 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3233 timevar_pop (TV_JUMP
);
3237 if (flag_thread_jumps
)
3239 /* This pass of jump threading straightens out code
3240 that was kinked by loop optimization. */
3241 timevar_push (TV_JUMP
);
3242 reg_scan (insns
, max_reg_num (), 0);
3243 thread_jumps (insns
, max_reg_num (), 0);
3244 timevar_pop (TV_JUMP
);
3247 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3248 timevar_pop (TV_CSE2
);
3253 cse_not_expected
= 1;
3257 /* Do control and data flow analysis; wrote some of the results to
3260 timevar_push (TV_FLOW
);
3261 open_dump_file (DFI_cfg
, decl
);
3263 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3265 check_function_return_warnings ();
3267 /* It may make more sense to mark constant functions after dead code is
3268 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3269 may insert code making function non-constant, but we still must consider
3270 it as constant, otherwise -fbranch-probabilities will not read data back.
3272 life_analyzis rarely eliminates modification of external memory.
3274 mark_constant_function ();
3276 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3278 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3280 timevar_push (TV_BRANCH_PROB
);
3281 open_dump_file (DFI_bp
, decl
);
3285 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3286 timevar_pop (TV_BRANCH_PROB
);
3289 open_dump_file (DFI_life
, decl
);
3294 /* Discover and record the loop depth at the head of each basic
3295 block. The loop infrastructure does the real job for us. */
3296 flow_loops_find (&loops
, LOOP_TREE
);
3298 /* Estimate using heuristics if no profiling info is available. */
3299 if (flag_guess_branch_prob
)
3300 estimate_probability (&loops
);
3303 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3305 flow_loops_free (&loops
);
3307 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3308 timevar_pop (TV_FLOW
);
3310 register_life_up_to_date
= 1;
3313 if (warn_uninitialized
|| extra_warnings
)
3315 uninitialized_vars_warning (DECL_INITIAL (decl
));
3317 setjmp_args_warning ();
3320 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3324 /* If -opt, try combining insns through substitution. */
3328 int rebuild_jump_labels_after_combine
= 0;
3330 timevar_push (TV_COMBINE
);
3331 open_dump_file (DFI_combine
, decl
);
3333 rebuild_jump_labels_after_combine
3334 = combine_instructions (insns
, max_reg_num ());
3336 /* Combining insns may have turned an indirect jump into a
3337 direct jump. Rebuid the JUMP_LABEL fields of jumping
3339 if (rebuild_jump_labels_after_combine
)
3341 timevar_push (TV_JUMP
);
3342 rebuild_jump_labels (insns
);
3343 timevar_pop (TV_JUMP
);
3345 timevar_push (TV_FLOW
);
3346 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3349 /* Blimey. We've got to have the CFG up to date for the call to
3350 if_convert below. However, the random deletion of blocks
3351 without updating life info can wind up with Wierd Stuff in
3352 global_live_at_end. We then run sched1, which updates things
3353 properly, discovers the wierdness and aborts. */
3354 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3355 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3356 | PROP_SCAN_DEAD_CODE
);
3358 timevar_pop (TV_FLOW
);
3361 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3362 timevar_pop (TV_COMBINE
);
3367 /* Rerun if-conversion, as combine may have simplified things enough to
3368 now meet sequence length restrictions. */
3371 timevar_push (TV_IFCVT
);
3372 open_dump_file (DFI_ce
, decl
);
3378 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3379 timevar_pop (TV_IFCVT
);
3382 /* Register allocation pre-pass, to reduce number of moves
3383 necessary for two-address machines. */
3384 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3386 timevar_push (TV_REGMOVE
);
3387 open_dump_file (DFI_regmove
, decl
);
3389 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3391 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3392 timevar_pop (TV_REGMOVE
);
3397 /* Any of the several passes since flow1 will have munged register
3398 lifetime data a bit. */
3400 register_life_up_to_date
= 0;
3402 #ifdef OPTIMIZE_MODE_SWITCHING
3403 timevar_push (TV_GCSE
);
3405 if (optimize_mode_switching (NULL
))
3407 /* We did work, and so had to regenerate global life information.
3408 Take advantage of this and don't re-recompute register life
3409 information below. */
3410 register_life_up_to_date
= 1;
3413 timevar_pop (TV_GCSE
);
3416 timevar_push (TV_SCHED
);
3418 split_all_insns (1);
3420 #ifdef INSN_SCHEDULING
3422 /* Print function header into sched dump now
3423 because doing the sched analysis makes some of the dump. */
3424 if (optimize
> 0 && flag_schedule_insns
)
3426 open_dump_file (DFI_sched
, decl
);
3428 /* Do control and data sched analysis,
3429 and write some of the results to dump file. */
3431 schedule_insns (rtl_dump_file
);
3433 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3435 /* Register lifetime information was updated as part of verifying
3437 register_life_up_to_date
= 1;
3440 timevar_pop (TV_SCHED
);
3444 /* Determine if the current function is a leaf before running reload
3445 since this can impact optimizations done by the prologue and
3446 epilogue thus changing register elimination offsets. */
3447 current_function_is_leaf
= leaf_function_p ();
3449 timevar_push (TV_LOCAL_ALLOC
);
3450 open_dump_file (DFI_lreg
, decl
);
3452 /* Allocate pseudo-regs that are used only within 1 basic block.
3454 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3455 jump optimizer after register allocation and reloading are finished. */
3457 if (! register_life_up_to_date
)
3458 recompute_reg_usage (insns
, ! optimize_size
);
3459 regclass (insns
, max_reg_num (), rtl_dump_file
);
3460 rebuild_label_notes_after_reload
= local_alloc ();
3462 timevar_pop (TV_LOCAL_ALLOC
);
3464 if (dump_file
[DFI_lreg
].enabled
)
3466 timevar_push (TV_DUMP
);
3468 dump_flow_info (rtl_dump_file
);
3469 dump_local_alloc (rtl_dump_file
);
3471 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3472 timevar_pop (TV_DUMP
);
3477 timevar_push (TV_GLOBAL_ALLOC
);
3478 open_dump_file (DFI_greg
, decl
);
3480 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3481 pass fixing up any insns that are invalid. */
3484 failure
= global_alloc (rtl_dump_file
);
3487 build_insn_chain (insns
);
3488 failure
= reload (insns
, 0);
3491 timevar_pop (TV_GLOBAL_ALLOC
);
3493 if (dump_file
[DFI_greg
].enabled
)
3495 timevar_push (TV_DUMP
);
3497 dump_global_regs (rtl_dump_file
);
3499 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3500 timevar_pop (TV_DUMP
);
3504 goto exit_rest_of_compilation
;
3508 open_dump_file (DFI_postreload
, decl
);
3510 /* Do a very simple CSE pass over just the hard registers. */
3513 timevar_push (TV_RELOAD_CSE_REGS
);
3514 reload_cse_regs (insns
);
3515 timevar_pop (TV_RELOAD_CSE_REGS
);
3518 /* If optimizing, then go ahead and split insns now since we are about
3519 to recompute flow information anyway. */
3522 int old_labelnum
= max_label_num ();
3524 split_all_insns (0);
3525 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3528 /* Register allocation and reloading may have turned an indirect jump into
3529 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3530 jumping instructions. */
3531 if (rebuild_label_notes_after_reload
)
3533 timevar_push (TV_JUMP
);
3535 rebuild_jump_labels (insns
);
3537 timevar_pop (TV_JUMP
);
3540 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3542 /* Re-create the death notes which were deleted during reload. */
3543 timevar_push (TV_FLOW2
);
3544 open_dump_file (DFI_flow2
, decl
);
3546 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3547 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3548 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3550 /* On some machines, the prologue and epilogue code, or parts thereof,
3551 can be represented as RTL. Doing so lets us schedule insns between
3552 it and the rest of the code and also allows delayed branch
3553 scheduling to operate in the epilogue. */
3554 thread_prologue_and_epilogue_insns (insns
);
3559 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3561 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3562 even for machines with possibly nonzero RETURN_POPS_ARGS
3563 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3564 push instructions will have popping returns. */
3565 #ifndef PUSH_ROUNDING
3566 if (!ACCUMULATE_OUTGOING_ARGS
)
3568 combine_stack_adjustments ();
3573 flow2_completed
= 1;
3575 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3576 timevar_pop (TV_FLOW2
);
3578 #ifdef HAVE_peephole2
3579 if (optimize
> 0 && flag_peephole2
)
3581 timevar_push (TV_PEEPHOLE2
);
3582 open_dump_file (DFI_peephole2
, decl
);
3584 peephole2_optimize (rtl_dump_file
);
3586 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3587 timevar_pop (TV_PEEPHOLE2
);
3591 if (optimize
> 0 && flag_rename_registers
)
3593 timevar_push (TV_RENAME_REGISTERS
);
3594 open_dump_file (DFI_rnreg
, decl
);
3596 regrename_optimize ();
3598 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3599 timevar_pop (TV_RENAME_REGISTERS
);
3604 timevar_push (TV_IFCVT2
);
3605 open_dump_file (DFI_ce2
, decl
);
3609 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3610 timevar_pop (TV_IFCVT2
);
3613 #ifdef INSN_SCHEDULING
3614 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3616 timevar_push (TV_SCHED2
);
3617 open_dump_file (DFI_sched2
, decl
);
3619 /* Do control and data sched analysis again,
3620 and write some more of the results to dump file. */
3622 split_all_insns (1);
3624 schedule_insns (rtl_dump_file
);
3626 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3627 timevar_pop (TV_SCHED2
);
3633 #ifdef LEAF_REGISTERS
3634 current_function_uses_only_leaf_regs
3635 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3638 if (optimize
> 0 && flag_reorder_blocks
)
3640 timevar_push (TV_REORDER_BLOCKS
);
3641 open_dump_file (DFI_bbro
, decl
);
3643 reorder_basic_blocks ();
3645 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3646 timevar_pop (TV_REORDER_BLOCKS
);
3649 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3650 Also do cross-jumping this time and delete no-op move insns. */
3654 timevar_push (TV_JUMP
);
3655 open_dump_file (DFI_jump2
, decl
);
3657 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3658 !JUMP_AFTER_REGSCAN
);
3660 /* CFG no longer kept up to date. */
3662 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3663 timevar_pop (TV_JUMP
);
3666 /* If a machine dependent reorganization is needed, call it. */
3667 #ifdef MACHINE_DEPENDENT_REORG
3668 open_dump_file (DFI_mach
, decl
);
3670 MACHINE_DEPENDENT_REORG (insns
);
3672 close_dump_file (DFI_mach
, print_rtl
, insns
);
3677 /* If a scheduling pass for delayed branches is to be done,
3678 call the scheduling code. */
3681 if (optimize
> 0 && flag_delayed_branch
)
3683 timevar_push (TV_DBR_SCHED
);
3684 open_dump_file (DFI_dbr
, decl
);
3686 dbr_schedule (insns
, rtl_dump_file
);
3688 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3689 timevar_pop (TV_DBR_SCHED
);
3695 timevar_push (TV_SHORTEN_BRANCH
);
3697 #ifdef HAVE_ATTR_length
3704 split_all_insns (0);
3705 timevar_pop (TV_SHORTEN_BRANCH
);
3708 timevar_push (TV_REG_STACK
);
3709 open_dump_file (DFI_stack
, decl
);
3711 reg_to_stack (insns
, rtl_dump_file
);
3713 close_dump_file (DFI_stack
, print_rtl
, insns
);
3714 timevar_pop (TV_REG_STACK
);
3719 convert_to_eh_region_ranges ();
3721 /* Shorten branches. */
3722 timevar_push (TV_SHORTEN_BRANCH
);
3723 shorten_branches (get_insns ());
3724 timevar_pop (TV_SHORTEN_BRANCH
);
3726 current_function_nothrow
= nothrow_function_p ();
3727 if (current_function_nothrow
)
3728 /* Now we know that this can't throw; set the flag for the benefit
3729 of other functions later in this translation unit. */
3730 TREE_NOTHROW (current_function_decl
) = 1;
3732 /* Now turn the rtl into assembler code. */
3734 timevar_push (TV_FINAL
);
3739 /* Get the function's name, as described by its RTL. This may be
3740 different from the DECL_NAME name used in the source file. */
3742 x
= DECL_RTL (decl
);
3743 if (GET_CODE (x
) != MEM
)
3746 if (GET_CODE (x
) != SYMBOL_REF
)
3748 fnname
= XSTR (x
, 0);
3750 assemble_start_function (decl
, fnname
);
3751 final_start_function (insns
, asm_out_file
, optimize
);
3752 final (insns
, asm_out_file
, optimize
, 0);
3753 final_end_function (insns
, asm_out_file
, optimize
);
3755 #ifdef IA64_UNWIND_INFO
3756 /* ??? The IA-64 ".handlerdata" directive must be issued before
3757 the ".endp" directive that closes the procedure descriptor. */
3758 output_function_exception_table ();
3761 assemble_end_function (decl
, fnname
);
3763 #ifndef IA64_UNWIND_INFO
3764 /* Otherwise, it feels unclean to switch sections in the middle. */
3765 output_function_exception_table ();
3769 fflush (asm_out_file
);
3771 /* Release all memory allocated by flow. */
3772 free_basic_block_vars (0);
3774 /* Release all memory held by regsets now. */
3775 regset_release_memory ();
3777 timevar_pop (TV_FINAL
);
3781 /* Write DBX symbols if requested. */
3783 /* Note that for those inline functions where we don't initially
3784 know for certain that we will be generating an out-of-line copy,
3785 the first invocation of this routine (rest_of_compilation) will
3786 skip over this code by doing a `goto exit_rest_of_compilation;'.
3787 Later on, finish_compilation will call rest_of_compilation again
3788 for those inline functions that need to have out-of-line copies
3789 generated. During that call, we *will* be routed past here. */
3791 timevar_push (TV_SYMOUT
);
3792 #ifdef DBX_DEBUGGING_INFO
3793 if (write_symbols
== DBX_DEBUG
)
3794 dbxout_function (decl
);
3797 #ifdef DWARF_DEBUGGING_INFO
3798 if (write_symbols
== DWARF_DEBUG
)
3799 dwarfout_file_scope_decl (decl
, 0);
3802 #ifdef DWARF2_DEBUGGING_INFO
3803 if (write_symbols
== DWARF2_DEBUG
)
3804 dwarf2out_decl (decl
);
3806 timevar_pop (TV_SYMOUT
);
3808 exit_rest_of_compilation
:
3810 /* In case the function was not output,
3811 don't leave any temporary anonymous types
3812 queued up for sdb output. */
3813 #ifdef SDB_DEBUGGING_INFO
3814 if (write_symbols
== SDB_DEBUG
)
3815 sdbout_types (NULL_TREE
);
3818 reload_completed
= 0;
3819 flow2_completed
= 0;
3822 timevar_push (TV_FINAL
);
3824 /* Clear out the insn_length contents now that they are no
3826 init_insn_lengths ();
3828 /* Clear out the real_constant_chain before some of the rtx's
3829 it runs through become garbage. */
3830 clear_const_double_mem ();
3832 /* Show no temporary slots allocated. */
3835 free_basic_block_vars (0);
3837 timevar_pop (TV_FINAL
);
3839 /* Make sure volatile mem refs aren't considered valid operands for
3840 arithmetic insns. We must call this here if this is a nested inline
3841 function, since the above code leaves us in the init_recog state
3842 (from final.c), and the function context push/pop code does not
3843 save/restore volatile_ok.
3845 ??? Maybe it isn't necessary for expand_start_function to call this
3846 anymore if we do it here? */
3848 init_recog_no_volatile ();
3850 /* We're done with this function. Free up memory if we can. */
3851 free_after_parsing (cfun
);
3852 if (! DECL_DEFER_OUTPUT (decl
))
3853 free_after_compilation (cfun
);
3858 timevar_pop (TV_REST_OF_COMPILATION
);
3868 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3869 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3870 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3871 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3872 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3873 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"));
3875 for (i
= ARRAY_SIZE (f_options
); i
--;)
3877 const char *description
= f_options
[i
].description
;
3879 if (description
!= NULL
&& * description
!= 0)
3880 printf (" -f%-21s %s\n",
3881 f_options
[i
].string
, _(description
));
3884 printf (_(" -O[number] Set optimisation level to [number]\n"));
3885 printf (_(" -Os Optimise for space rather than speed\n"));
3886 for (i
= LAST_PARAM
; i
--;)
3888 const char *description
= compiler_params
[i
].help
;
3889 const int length
= 21-strlen(compiler_params
[i
].option
);
3891 if (description
!= NULL
&& * description
!= 0)
3892 printf (" --param %s=<value>%.*s%s\n",
3893 compiler_params
[i
].option
,
3894 length
> 0 ? length
: 1, " ",
3897 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3898 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3899 printf (_(" -w Suppress warnings\n"));
3900 printf (_(" -W Enable extra warnings\n"));
3902 for (i
= ARRAY_SIZE (W_options
); i
--;)
3904 const char *description
= W_options
[i
].description
;
3906 if (description
!= NULL
&& * description
!= 0)
3907 printf (" -W%-21s %s\n",
3908 W_options
[i
].string
, _(description
));
3911 printf (_(" -Wunused Enable unused warnings\n"));
3912 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3913 printf (_(" -p Enable function profiling\n"));
3914 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3915 printf (_(" -a Enable block profiling \n"));
3917 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3918 printf (_(" -ax Enable jump profiling \n"));
3920 printf (_(" -o <file> Place output into <file> \n"));
3922 -G <number> Put global and static data smaller than <number>\n\
3923 bytes into a special section (on some targets)\n"));
3925 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3927 if (debug_args
[i
].description
!= NULL
)
3928 printf (" -g%-21s %s\n",
3929 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3932 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3933 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3934 printf (_(" -version Display the compiler's version\n"));
3935 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3936 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3937 #if defined INSN_SCHEDULING
3938 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3940 printf (_(" --help Display this information\n"));
3945 /* Display descriptions of language specific options.
3946 If there is no description, note that there is an undocumented option.
3947 If the description is empty, do not display anything. (This allows
3948 options to be deliberately undocumented, for whatever reason).
3949 If the option string is missing, then this is a marker, indicating
3950 that the description string is in fact the name of a language, whose
3951 language specific options are to follow. */
3953 if (ARRAY_SIZE (documented_lang_options
) > 1)
3955 printf (_("\nLanguage specific options:\n"));
3957 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3959 const char *description
= documented_lang_options
[i
].description
;
3960 const char *option
= documented_lang_options
[i
].option
;
3962 if (description
== NULL
)
3967 printf (_(" %-23.23s [undocumented]\n"), option
);
3969 else if (*description
== 0)
3971 else if (option
== NULL
)
3975 (_("\nThere are undocumented %s specific options as well.\n"),
3979 printf (_("\n Options for %s:\n"), description
);
3984 printf (" %-23.23s %s\n", option
, _(description
));
3989 printf (_("\nThere are undocumented %s specific options as well.\n"),
3992 display_target_options ();
3996 display_target_options ()
4000 if (ARRAY_SIZE (target_switches
) > 1
4001 #ifdef TARGET_OPTIONS
4002 || ARRAY_SIZE (target_options
) > 1
4010 printf (_("\nTarget specific options:\n"));
4012 for (i
= ARRAY_SIZE (target_switches
); i
--;)
4014 const char *option
= target_switches
[i
].name
;
4015 const char *description
= target_switches
[i
].description
;
4017 if (option
== NULL
|| *option
== 0)
4019 else if (description
== NULL
)
4024 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4026 else if (* description
!= 0)
4027 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4030 #ifdef TARGET_OPTIONS
4031 for (i
= ARRAY_SIZE (target_options
); i
--;)
4033 const char *option
= target_options
[i
].prefix
;
4034 const char *description
= target_options
[i
].description
;
4036 if (option
== NULL
|| *option
== 0)
4038 else if (description
== NULL
)
4043 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4045 else if (* description
!= 0)
4046 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4052 printf (_("\nThere are undocumented target specific options as well.\n"));
4054 printf (_(" They exist, but they are not documented.\n"));
4059 /* Parse a -d... comand line switch. */
4062 decode_d_option (arg
)
4071 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4072 dump_file
[i
].enabled
= 1;
4078 flag_print_asm_name
= 1;
4081 flag_dump_rtl_in_asm
= 1;
4082 flag_print_asm_name
= 1;
4085 graph_dump_format
= vcg
;
4088 rtl_dump_and_exit
= 1;
4093 case 'D': /* These are handled by the preprocessor. */
4099 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4100 if (c
== dump_file
[i
].debug_switch
)
4102 dump_file
[i
].enabled
= 1;
4107 warning ("unrecognized gcc debugging option: %c", c
);
4112 /* Parse a -f... comand line switch. ARG is the value after the -f.
4113 It is safe to access 'ARG - 2' to generate the full switch name.
4114 Return the number of strings consumed. */
4117 decode_f_option (arg
)
4121 const char *option_value
= NULL
;
4123 /* Search for the option in the table of binary f options. */
4124 for (j
= ARRAY_SIZE (f_options
); j
--;)
4126 if (!strcmp (arg
, f_options
[j
].string
))
4128 *f_options
[j
].variable
= f_options
[j
].on_value
;
4132 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4133 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4135 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4140 if (!strcmp (arg
, "fast-math"))
4141 set_fast_math_flags();
4142 else if (!strcmp (arg
, "no-fast-math"))
4143 set_no_fast_math_flags();
4144 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4145 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4148 read_integral_parameter (option_value
, arg
- 2,
4150 set_param_value ("max-inline-insns", val
);
4152 #ifdef INSN_SCHEDULING
4153 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4154 fix_sched_param ("verbose", option_value
);
4156 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4157 fix_register (option_value
, 1, 1);
4158 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4159 fix_register (option_value
, 0, 1);
4160 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4161 fix_register (option_value
, 0, 0);
4162 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4163 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4164 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4166 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4167 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4168 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4169 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4171 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4172 else if ((option_value
4173 = skip_leading_substring (arg
, "stack-limit-register=")))
4175 int reg
= decode_reg_name (option_value
);
4177 error ("unrecognized register name `%s'", option_value
);
4179 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4181 else if ((option_value
4182 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4185 nm
= ggc_strdup (option_value
);
4186 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4188 else if ((option_value
4189 = skip_leading_substring (arg
, "message-length=")))
4190 output_set_maximum_length
4191 (&global_dc
->buffer
, read_integral_parameter
4192 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4193 else if ((option_value
4194 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4196 if (!strcmp (option_value
, "once"))
4197 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4198 else if (!strcmp (option_value
, "every-line"))
4199 diagnostic_prefixing_rule (global_dc
)
4200 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4202 error ("Unrecognized option `%s'", arg
- 2);
4204 else if (!strcmp (arg
, "no-stack-limit"))
4205 stack_limit_rtx
= NULL_RTX
;
4206 else if (!strcmp (arg
, "preprocessed"))
4207 /* Recognise this switch but do nothing. This prevents warnings
4208 about an unrecognized switch if cpplib has not been linked in. */
4216 /* Parse a -W... comand line switch. ARG is the value after the -W.
4217 It is safe to access 'ARG - 2' to generate the full switch name.
4218 Return the number of strings consumed. */
4221 decode_W_option (arg
)
4224 const char *option_value
= NULL
;
4227 /* Search for the option in the table of binary W options. */
4229 for (j
= ARRAY_SIZE (W_options
); j
--;)
4231 if (!strcmp (arg
, W_options
[j
].string
))
4233 *W_options
[j
].variable
= W_options
[j
].on_value
;
4237 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4238 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4240 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4245 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4246 warning ("-Wid-clash-LEN is no longer supported");
4247 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4249 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4251 warn_larger_than
= larger_than_size
!= -1;
4253 else if (!strcmp (arg
, "unused"))
4257 else if (!strcmp (arg
, "no-unused"))
4267 /* Parse a -g... comand line switch. ARG is the value after the -g.
4268 It is safe to access 'ARG - 2' to generate the full switch name.
4269 Return the number of strings consumed. */
4272 decode_g_option (arg
)
4275 static unsigned level
=0;
4276 /* A lot of code assumes write_symbols == NO_DEBUG if the
4277 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4278 of what debugging type has been selected). This records the
4279 selected type. It is an error to specify more than one
4281 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4282 /* Non-zero if debugging format has been explicitly set.
4283 -g and -ggdb don't explicitly set the debugging format so
4284 -gdwarf -g3 is equivalent to -gdwarf3. */
4285 static int type_explicitly_set_p
= 0;
4286 /* Indexed by enum debug_info_type. */
4287 static const char *debug_type_names
[] =
4289 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4292 /* The maximum admissible debug level value. */
4293 static const unsigned max_debug_level
= 3;
4295 /* Look up ARG in the table. */
4296 for (da
= debug_args
; da
->arg
; da
++)
4298 const int da_len
= strlen (da
->arg
);
4300 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4302 enum debug_info_type type
= da
->debug_type
;
4303 const char *p
= arg
+ da_len
;
4305 if (*p
&& (*p
< '0' || *p
> '9'))
4308 /* A debug flag without a level defaults to level 2.
4309 Note we do not want to call read_integral_parameter
4310 for that case since it will call atoi which
4313 ??? We may want to generalize the interface to
4314 read_integral_parameter to better handle this case
4315 if this case shows up often. */
4317 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4319 level
= (level
== 0) ? 2 : level
;
4321 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4323 error ("use -gdwarf -g%d for DWARF v1, level %d",
4326 error ("use -gdwarf-2 for DWARF v2");
4329 if (level
> max_debug_level
)
4332 ignoring option `%s' due to invalid debug level specification",
4334 level
= debug_info_level
;
4337 if (type
== NO_DEBUG
)
4339 type
= PREFERRED_DEBUGGING_TYPE
;
4341 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4343 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4344 type
= DWARF2_DEBUG
;
4346 #ifdef DBX_DEBUGGING_INFO
4353 if (type
== NO_DEBUG
)
4354 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4356 /* Does it conflict with an already selected type? */
4357 if (type_explicitly_set_p
4358 /* -g/-ggdb don't conflict with anything. */
4359 && da
->debug_type
!= NO_DEBUG
4360 && type
!= selected_debug_type
)
4361 warning ("`%s' ignored, conflicts with `-g%s'",
4362 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4365 /* If the format has already been set, -g/-ggdb
4366 only change the debug level. */
4367 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4368 /* Don't change debugging type. */
4372 selected_debug_type
= type
;
4373 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4376 write_symbols
= (level
== 0
4378 : selected_debug_type
);
4379 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4380 debug_info_level
= (enum debug_info_level
) level
;
4393 /* Decode the first argument in the argv as a language-independent option.
4394 Return the number of strings consumed. */
4397 independent_decode_option (argc
, argv
)
4401 char *arg
= argv
[0];
4403 if (arg
[0] != '-' || arg
[1] == 0)
4415 if (!strcmp (arg
, "-help"))
4418 exit_after_options
= 1;
4421 if (!strcmp (arg
, "-target-help"))
4423 display_target_options ();
4424 exit_after_options
= 1;
4427 if (!strcmp (arg
, "-version"))
4429 print_version (stderr
, "");
4430 exit_after_options
= 1;
4433 /* Handle '--param <name>=<value>'. */
4434 if (strcmp (arg
, "-param") == 0)
4440 error ("-param option missing argument");
4444 /* Get the '<name>=<value>' parameter. */
4446 /* Look for the `='. */
4447 equal
= strchr (arg
, '=');
4449 error ("invalid --param option: %s", arg
);
4454 /* Zero out the `=' sign so that we get two separate strings. */
4456 /* Figure out what value is specified. */
4457 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4458 if (val
!= INVALID_PARAM_VAL
)
4459 set_param_value (arg
, val
);
4461 error ("invalid parameter value `%s'", equal
+ 1);
4476 /* Already been treated in main (). Do nothing. */
4480 set_target_switch (arg
+ 1);
4484 return decode_f_option (arg
+ 1);
4487 return decode_g_option (arg
+ 1);
4490 if (!strcmp (arg
, "dumpbase"))
4495 dump_base_name
= argv
[1];
4499 decode_d_option (arg
+ 1);
4503 if (!strcmp (arg
, "pedantic"))
4505 else if (!strcmp (arg
, "pedantic-errors"))
4506 flag_pedantic_errors
= pedantic
= 1;
4507 else if (arg
[1] == 0)
4514 if (!strcmp (arg
, "quiet"))
4521 if (!strcmp (arg
, "version"))
4529 inhibit_warnings
= 1;
4538 /* We save the value of warn_uninitialized, since if they put
4539 -Wuninitialized on the command line, we need to generate a
4540 warning about not using it without also specifying -O. */
4541 if (warn_uninitialized
!= 1)
4542 warn_uninitialized
= 2;
4545 return decode_W_option (arg
+ 1);
4551 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4552 warning ("`-a' option (basic block profile) not supported");
4554 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4557 else if (!strcmp (arg
, "ax"))
4559 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4560 warning ("`-ax' option (jump profiling) not supported");
4562 profile_block_flag
= (!profile_block_flag
4563 || profile_block_flag
== 2) ? 2 : 3;
4566 else if (!strncmp (arg
, "aux-info", 8))
4573 aux_info_file_name
= argv
[1];
4574 flag_gen_aux_info
= 1;
4577 else if (arg
[8] == '=')
4579 aux_info_file_name
= arg
+ 9;
4580 flag_gen_aux_info
= 1;
4595 asm_file_name
= argv
[1];
4610 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4615 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4619 if (g_switch_val
== -1)
4623 g_switch_set
= TRUE
;
4624 g_switch_value
= g_switch_val
;
4634 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4635 Decode command args, then call compile_file.
4636 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4637 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4639 It is not safe to call this function more than once. */
4642 toplev_main (argc
, argv
)
4649 /* save in case md file wants to emit args as a comment. */
4653 p
= argv
[0] + strlen (argv
[0]);
4654 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4658 xmalloc_set_program_name (progname
);
4660 /* LC_CTYPE determines the character set used by the terminal so it has be set
4661 to output messages correctly. */
4663 #ifdef HAVE_LC_MESSAGES
4664 setlocale (LC_CTYPE
, "");
4665 setlocale (LC_MESSAGES
, "");
4667 setlocale (LC_ALL
, "");
4670 (void) bindtextdomain (PACKAGE
, localedir
);
4671 (void) textdomain (PACKAGE
);
4673 /* Install handler for SIGFPE, which may be received while we do
4674 compile-time floating point arithmetic. */
4675 signal (SIGFPE
, float_signal
);
4677 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4679 signal (SIGSEGV
, crash_signal
);
4682 signal (SIGILL
, crash_signal
);
4685 signal (SIGBUS
, crash_signal
);
4688 signal (SIGABRT
, crash_signal
);
4690 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4691 signal (SIGIOT
, crash_signal
);
4694 decl_printable_name
= decl_name
;
4695 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4697 /* Initialize whether `char' is signed. */
4698 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4699 #ifdef DEFAULT_SHORT_ENUMS
4700 /* Initialize how much space enums occupy, by default. */
4701 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4704 /* Initialize the garbage-collector. */
4707 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4708 ggc_add_tree_root (¤t_function_decl
, 1);
4709 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4711 /* Initialize the diagnostics reporting machinery. */
4712 diagnostic_initialize (global_dc
);
4714 /* Register the language-independent parameters. */
4715 add_params (lang_independent_params
, LAST_PARAM
);
4717 /* Perform language-specific options intialization. */
4718 if (lang_hooks
.init_options
)
4719 (*lang_hooks
.init_options
) ();
4721 /* Scan to see what optimization level has been specified. That will
4722 determine the default value of many flags. */
4723 for (i
= 1; i
< argc
; i
++)
4725 if (!strcmp (argv
[i
], "-O"))
4730 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4732 /* Handle -Os, -O2, -O3, -O69, ... */
4733 char *p
= &argv
[i
][2];
4735 if ((p
[0] == 's') && (p
[1] == 0))
4739 /* Optimizing for size forces optimize to be 2. */
4744 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4745 if (optimize_val
!= -1)
4747 optimize
= optimize_val
;
4757 flag_thread_jumps
= 1;
4759 flag_delayed_branch
= 1;
4761 #ifdef CAN_DEBUG_WITHOUT_FP
4762 flag_omit_frame_pointer
= 1;
4764 flag_guess_branch_prob
= 1;
4769 flag_optimize_sibling_calls
= 1;
4770 flag_cse_follow_jumps
= 1;
4771 flag_cse_skip_blocks
= 1;
4773 flag_expensive_optimizations
= 1;
4774 flag_strength_reduce
= 1;
4775 flag_rerun_cse_after_loop
= 1;
4776 flag_rerun_loop_opt
= 1;
4777 flag_caller_saves
= 1;
4780 #ifdef INSN_SCHEDULING
4781 flag_schedule_insns
= 1;
4782 flag_schedule_insns_after_reload
= 1;
4785 flag_strict_aliasing
= 1;
4786 flag_delete_null_pointer_checks
= 1;
4787 flag_reorder_blocks
= 1;
4792 flag_inline_functions
= 1;
4793 flag_rename_registers
= 1;
4796 if (optimize
< 2 || optimize_size
)
4801 align_functions
= 1;
4804 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4807 set_target_switch ("");
4809 /* Unwind tables are always present in an ABI-conformant IA-64
4810 object file, so the default should be ON. */
4811 #ifdef IA64_UNWIND_INFO
4812 flag_unwind_tables
= IA64_UNWIND_INFO
;
4815 #ifdef OPTIMIZATION_OPTIONS
4816 /* Allow default optimizations to be specified on a per-machine basis. */
4817 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4820 /* Initialize register usage now so switches may override. */
4823 /* Perform normal command line switch decoding. */
4824 for (i
= 1; i
< argc
;)
4827 int indep_processed
;
4829 /* Give the language a chance to decode the option for itself. */
4830 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4832 if (lang_processed
>= 0)
4833 /* Now see if the option also has a language independent meaning.
4834 Some options are both language specific and language independent,
4836 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4839 lang_processed
= -lang_processed
;
4840 indep_processed
= 0;
4843 if (lang_processed
|| indep_processed
)
4844 i
+= MAX (lang_processed
, indep_processed
);
4847 const char *option
= NULL
;
4848 const char *lang
= NULL
;
4851 /* It is possible that the command line switch is not valid for the
4852 current language, but it is valid for another language. In order
4853 to be compatible with previous versions of the compiler (which
4854 did not issue an error message in this case) we check for this
4855 possibility here. If we do find a match, then if extra_warnings
4856 is set we generate a warning message, otherwise we will just
4857 ignore the option. */
4858 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4860 option
= documented_lang_options
[j
].option
;
4863 lang
= documented_lang_options
[j
].description
;
4864 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4868 if (j
!= ARRAY_SIZE (documented_lang_options
))
4872 warning ("Ignoring command line option '%s'", argv
[i
]);
4875 ("(It is valid for %s but not the selected language)",
4879 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4880 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4882 error ("Unrecognized option `%s'", argv
[i
]);
4888 /* All command line options have been processed. */
4889 if (lang_hooks
.post_options
)
4890 (*lang_hooks
.post_options
) ();
4892 if (exit_after_options
)
4895 /* Checker uses the frame pointer. */
4896 if (flag_check_memory_usage
)
4897 flag_omit_frame_pointer
= 0;
4901 /* Inlining does not work if not optimizing,
4902 so force it not to be done. */
4906 /* The c_decode_option function and decode_option hook set
4907 this to `2' if -Wall is used, so we can avoid giving out
4908 lots of errors for people who don't realize what -Wall does. */
4909 if (warn_uninitialized
== 1)
4910 warning ("-Wuninitialized is not supported without -O");
4913 /* We do not currently support sibling-call optimization in the
4914 presence of exceptions. See PR2975 for a test-case that will
4915 fail if we try to combine both of these features. */
4916 if (flag_exceptions
)
4917 flag_optimize_sibling_calls
= 0;
4919 #ifdef OVERRIDE_OPTIONS
4920 /* Some machines may reject certain combinations of options. */
4924 /* Set up the align_*_log variables, defaulting them to 1 if they
4925 were still unset. */
4926 if (align_loops
<= 0) align_loops
= 1;
4927 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4928 if (align_jumps
<= 0) align_jumps
= 1;
4929 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4930 if (align_labels
<= 0) align_labels
= 1;
4931 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4932 if (align_functions
<= 0) align_functions
= 1;
4933 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4935 if (profile_block_flag
== 3)
4937 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4938 profile_block_flag
= 2;
4941 /* Unrolling all loops implies that standard loop unrolling must also
4943 if (flag_unroll_all_loops
)
4944 flag_unroll_loops
= 1;
4945 /* Loop unrolling requires that strength_reduction be on also. Silently
4946 turn on strength reduction here if it isn't already on. Also, the loop
4947 unrolling code assumes that cse will be run after loop, so that must
4948 be turned on also. */
4949 if (flag_unroll_loops
)
4951 flag_strength_reduce
= 1;
4952 flag_rerun_cse_after_loop
= 1;
4955 /* Warn about options that are not supported on this machine. */
4956 #ifndef INSN_SCHEDULING
4957 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4958 warning ("instruction scheduling not supported on this target machine");
4961 if (flag_delayed_branch
)
4962 warning ("this target machine does not have delayed branches");
4965 /* Some operating systems do not allow profiling without a frame
4967 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4969 && flag_omit_frame_pointer
)
4971 error ("profiling does not work without a frame pointer");
4972 flag_omit_frame_pointer
= 0;
4975 user_label_prefix
= USER_LABEL_PREFIX
;
4976 if (flag_leading_underscore
!= -1)
4978 /* If the default prefix is more complicated than "" or "_",
4979 issue a warning and ignore this option. */
4980 if (user_label_prefix
[0] == 0 ||
4981 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4983 user_label_prefix
= flag_leading_underscore
? "_" : "";
4986 warning ("-f%sleading-underscore not supported on this target machine",
4987 flag_leading_underscore
? "" : "no-");
4990 /* If we are in verbose mode, write out the version and maybe all the
4991 option flags in use. */
4994 print_version (stderr
, "");
4996 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4999 compile_file (filename
);
5002 return (FATAL_EXIT_CODE
);
5004 return (FATAL_EXIT_CODE
);
5005 return (SUCCESS_EXIT_CODE
);
5008 /* Decode -m switches. */
5009 /* Decode the switch -mNAME. */
5012 set_target_switch (name
)
5016 int valid_target_option
= 0;
5018 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5019 if (!strcmp (target_switches
[j
].name
, name
))
5021 if (target_switches
[j
].value
< 0)
5022 target_flags
&= ~-target_switches
[j
].value
;
5024 target_flags
|= target_switches
[j
].value
;
5025 valid_target_option
= 1;
5028 #ifdef TARGET_OPTIONS
5029 if (!valid_target_option
)
5030 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5032 int len
= strlen (target_options
[j
].prefix
);
5033 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5035 *target_options
[j
].variable
= name
+ len
;
5036 valid_target_option
= 1;
5041 if (!valid_target_option
)
5042 error ("Invalid option `%s'", name
);
5045 /* Print version information to FILE.
5046 Each line begins with INDENT (for the case where FILE is the
5047 assembler output file). */
5050 print_version (file
, indent
)
5055 #define __VERSION__ "[?]"
5059 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5061 "%s%s%s version %s (%s) compiled by CC.\n"
5063 , indent
, *indent
!= 0 ? " " : "",
5064 language_string
, version_string
, TARGET_NAME
,
5065 indent
, __VERSION__
);
5068 /* Print an option value and return the adjusted position in the line.
5069 ??? We don't handle error returns from fprintf (disk full); presumably
5070 other code will catch a disk full though. */
5073 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5076 const char *indent
, *sep
, *term
, *type
, *name
;
5078 /* The ultrix fprintf returns 0 on success, so compute the result we want
5079 here since we need it for the following test. */
5080 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5085 fprintf (file
, "%s", term
);
5090 fprintf (file
, "%s", indent
);
5091 pos
= strlen (indent
);
5093 fprintf (file
, "%s%s%s", sep
, type
, name
);
5098 /* Print active target switches to FILE.
5099 POS is the current cursor position and MAX is the size of a "line".
5100 Each line begins with INDENT and ends with TERM.
5101 Each switch is separated from the next by SEP. */
5104 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5107 const char *indent
, *sep
, *term
;
5112 /* Print the options as passed. */
5114 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5115 _("options passed: "), "");
5117 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5121 if (strcmp (*p
, "-o") == 0)
5127 if (strcmp (*p
, "-quiet") == 0)
5129 if (strcmp (*p
, "-version") == 0)
5134 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5137 fprintf (file
, "%s", term
);
5139 /* Print the -f and -m options that have been enabled.
5140 We don't handle language specific options but printing argv
5143 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5144 _("options enabled: "), "");
5146 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5147 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5148 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5149 "-f", f_options
[j
].string
);
5151 /* Print target specific options. */
5153 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5154 if (target_switches
[j
].name
[0] != '\0'
5155 && target_switches
[j
].value
> 0
5156 && ((target_switches
[j
].value
& target_flags
)
5157 == target_switches
[j
].value
))
5159 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5160 "-m", target_switches
[j
].name
);
5163 #ifdef TARGET_OPTIONS
5164 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5165 if (*target_options
[j
].variable
!= NULL
)
5168 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5169 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5170 prefix
, *target_options
[j
].variable
);
5174 fprintf (file
, "%s", term
);
5177 /* Record the beginning of a new source file, named FILENAME. */
5180 debug_start_source_file (lineno
, filename
)
5181 register unsigned int lineno ATTRIBUTE_UNUSED
;
5182 register const char *filename ATTRIBUTE_UNUSED
;
5184 #ifdef DBX_DEBUGGING_INFO
5185 if (write_symbols
== DBX_DEBUG
)
5186 dbxout_start_new_source_file (filename
);
5188 #ifdef DWARF_DEBUGGING_INFO
5189 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5190 && write_symbols
== DWARF_DEBUG
)
5191 dwarfout_start_new_source_file (filename
);
5192 #endif /* DWARF_DEBUGGING_INFO */
5193 #ifdef DWARF2_DEBUGGING_INFO
5194 if (write_symbols
== DWARF2_DEBUG
)
5195 dwarf2out_start_source_file (lineno
, filename
);
5196 #endif /* DWARF2_DEBUGGING_INFO */
5197 #ifdef SDB_DEBUGGING_INFO
5198 if (write_symbols
== SDB_DEBUG
)
5199 sdbout_start_new_source_file (filename
);
5203 /* Record the resumption of a source file. LINENO is the line number in
5204 the source file we are returning to. */
5207 debug_end_source_file (lineno
)
5208 register unsigned lineno ATTRIBUTE_UNUSED
;
5210 #ifdef DBX_DEBUGGING_INFO
5211 if (write_symbols
== DBX_DEBUG
)
5212 dbxout_resume_previous_source_file ();
5214 #ifdef DWARF_DEBUGGING_INFO
5215 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5216 && write_symbols
== DWARF_DEBUG
)
5217 dwarfout_resume_previous_source_file (lineno
);
5218 #endif /* DWARF_DEBUGGING_INFO */
5219 #ifdef DWARF2_DEBUGGING_INFO
5220 if (write_symbols
== DWARF2_DEBUG
)
5221 dwarf2out_end_source_file ();
5222 #endif /* DWARF2_DEBUGGING_INFO */
5223 #ifdef SDB_DEBUGGING_INFO
5224 if (write_symbols
== SDB_DEBUG
)
5225 sdbout_resume_previous_source_file ();
5229 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5230 the tail part of the directive line, i.e. the part which is past the
5231 initial whitespace, #, whitespace, directive-name, whitespace part. */
5234 debug_define (lineno
, buffer
)
5235 register unsigned lineno ATTRIBUTE_UNUSED
;
5236 register const char *buffer ATTRIBUTE_UNUSED
;
5238 #ifdef DWARF_DEBUGGING_INFO
5239 if (write_symbols
== DWARF_DEBUG
)
5240 dwarfout_define (lineno
, buffer
);
5241 #endif /* DWARF_DEBUGGING_INFO */
5242 #ifdef DWARF2_DEBUGGING_INFO
5243 if (write_symbols
== DWARF2_DEBUG
)
5244 dwarf2out_define (lineno
, buffer
);
5245 #endif /* DWARF2_DEBUGGING_INFO */
5248 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5249 the tail part of the directive line, i.e. the part which is past the
5250 initial whitespace, #, whitespace, directive-name, whitespace part. */
5253 debug_undef (lineno
, buffer
)
5254 register unsigned lineno ATTRIBUTE_UNUSED
;
5255 register const char *buffer ATTRIBUTE_UNUSED
;
5257 #ifdef DWARF_DEBUGGING_INFO
5258 if (write_symbols
== DWARF_DEBUG
)
5259 dwarfout_undef (lineno
, buffer
);
5260 #endif /* DWARF_DEBUGGING_INFO */
5261 #ifdef DWARF2_DEBUGGING_INFO
5262 if (write_symbols
== DWARF2_DEBUG
)
5263 dwarf2out_undef (lineno
, buffer
);
5264 #endif /* DWARF2_DEBUGGING_INFO */
5267 /* Returns nonzero if it is appropriate not to emit any debugging
5268 information for BLOCK, because it doesn't contain any instructions.
5269 This may not be the case for blocks containing nested functions, since
5270 we may actually call such a function even though the BLOCK information
5274 debug_ignore_block (block
)
5275 tree block ATTRIBUTE_UNUSED
;
5277 /* Never delete the BLOCK for the outermost scope
5278 of the function; we can refer to names from
5279 that scope even if the block notes are messed up. */
5280 if (is_body_block (block
))
5283 #ifdef DWARF2_DEBUGGING_INFO
5284 if (write_symbols
== DWARF2_DEBUG
)
5285 return dwarf2out_ignore_block (block
);