1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 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-codes.h"
49 #include "insn-config.h"
50 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
68 #ifndef ACCUMULATE_OUTGOING_ARGS
69 #define ACCUMULATE_OUTGOING_ARGS 0
72 #ifdef DWARF_DEBUGGING_INFO
76 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
77 #include "dwarf2out.h"
80 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
84 #ifdef SDB_DEBUGGING_INFO
88 #ifdef XCOFF_DEBUGGING_INFO
93 /* The extra parameters substantially improve the I/O performance. */
96 vms_fopen (fname
, type
)
100 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
101 fixed arguments, which matches ANSI's specification but not VAXCRTL's
102 pre-ANSI implementation. This hack circumvents the mismatch problem. */
103 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
106 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
107 "deq=64", "fop=tef", "shr=nil");
109 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
112 #define fopen vms_fopen
115 #ifndef DEFAULT_GDB_EXTENSIONS
116 #define DEFAULT_GDB_EXTENSIONS 1
119 /* If more than one debugging type is supported, you must define
120 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
122 This is one long line cause VAXC can't handle a \-newline. */
123 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
124 #ifndef PREFERRED_DEBUGGING_TYPE
125 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
126 #endif /* no PREFERRED_DEBUGGING_TYPE */
127 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
128 so the following code needn't care. */
129 #ifdef DBX_DEBUGGING_INFO
130 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
132 #ifdef SDB_DEBUGGING_INFO
133 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
135 #ifdef DWARF_DEBUGGING_INFO
136 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
138 #ifdef DWARF2_DEBUGGING_INFO
139 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
141 #ifdef XCOFF_DEBUGGING_INFO
142 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
144 #endif /* More than one debugger format enabled. */
146 /* If still not defined, must have been because no debugging formats
148 #ifndef PREFERRED_DEBUGGING_TYPE
149 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
152 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
153 extern char **environ
;
156 /* Carry information from ASM_DECLARE_OBJECT_NAME
157 to ASM_FINISH_DECLARE_OBJECT. */
159 extern int size_directive_output
;
160 extern tree last_assemble_variable_decl
;
162 static void set_target_switch
PARAMS ((const char *));
163 static const char *decl_name
PARAMS ((tree
, int));
165 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
166 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
167 #ifdef ASM_IDENTIFY_LANGUAGE
168 /* This might or might not be used in ASM_IDENTIFY_LANGUAGE. */
169 static void output_lang_identify
PARAMS ((FILE *)) ATTRIBUTE_UNUSED
;
171 static void compile_file
PARAMS ((const char *));
172 static void display_help
PARAMS ((void));
173 static void display_target_options
PARAMS ((void));
175 static void decode_d_option
PARAMS ((const char *));
176 static int decode_f_option
PARAMS ((const char *));
177 static int decode_W_option
PARAMS ((const char *));
178 static int decode_g_option
PARAMS ((const char *));
179 static unsigned int independent_decode_option
PARAMS ((int, char **));
181 static void print_version
PARAMS ((FILE *, const char *));
182 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
183 const char *, const char *,
184 const char *, const char *));
185 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
186 const char *, const char *));
188 /* Length of line when printing switch values. */
191 /* Name of program invoked, sans directories. */
193 const char *progname
;
195 /* Copy of arguments to main. */
199 /* Name of current original source file (what was input to cpp).
200 This comes from each #-command in the actual input. */
202 const char *input_filename
;
204 /* Name of top-level original source file (what was input to cpp).
205 This comes from the #-command at the beginning of the actual input.
206 If there isn't any there, then this is the cc1 input file name. */
208 const char *main_input_filename
;
210 /* Current line number in real source file. */
214 /* Nonzero if it is unsafe to create any new pseudo registers. */
217 /* Stack of currently pending input files. */
219 struct file_stack
*input_file_stack
;
221 /* Incremented on each change to input_file_stack. */
222 int input_file_stack_tick
;
224 /* Name to use as base of names for dump output files. */
226 const char *dump_base_name
;
228 /* Bit flags that specify the machine subtype we are compiling for.
229 Bits are tested using macros TARGET_... defined in the tm.h file
230 and set by `-m...' switches. Must be defined in rtlanal.c. */
232 extern int target_flags
;
234 /* Describes a dump file. */
236 struct dump_file_info
238 /* The unique extension to apply, e.g. ".jump". */
239 const char *const extension
;
241 /* The -d<c> character that enables this dump file. */
242 char const debug_switch
;
244 /* True if there is a corresponding graph dump file. */
245 char const graph_dump_p
;
247 /* True if the user selected this dump. */
250 /* True if the files have been initialized (ie truncated). */
254 /* Enumerate the extant dump files. */
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 struct dump_file_info dump_file
[DFI_MAX
] =
303 { "rtl", 'r', 0, 0, 0 },
304 { "sibling", 'i', 0, 0, 0 },
305 { "jump", 'j', 0, 0, 0 },
306 { "cse", 's', 0, 0, 0 },
307 { "addressof", 'F', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "dce", 'X', 1, 0, 0 },
310 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
311 { "gcse", 'G', 1, 0, 0 },
312 { "loop", 'L', 1, 0, 0 },
313 { "cse2", 't', 1, 0, 0 },
314 { "cfg", 'f', 1, 0, 0 },
315 { "bp", 'b', 1, 0, 0 },
316 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
317 { "combine", 'c', 1, 0, 0 },
318 { "ce", 'C', 1, 0, 0 },
319 { "regmove", 'N', 1, 0, 0 },
320 { "sched", 'S', 1, 0, 0 },
321 { "lreg", 'l', 1, 0, 0 },
322 { "greg", 'g', 1, 0, 0 },
323 { "postreload", 'o', 1, 0, 0 },
324 { "flow2", 'w', 1, 0, 0 },
325 { "peephole2", 'z', 1, 0, 0 },
326 { "rnreg", 'n', 1, 0, 0 },
327 { "ce2", 'E', 1, 0, 0 },
328 { "sched2", 'R', 1, 0, 0 },
329 { "bbro", 'B', 1, 0, 0 },
330 { "jump2", 'J', 1, 0, 0 },
331 { "mach", 'M', 1, 0, 0 },
332 { "dbr", 'd', 0, 0, 0 },
333 { "stack", 'k', 1, 0, 0 },
336 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
337 static void close_dump_file
PARAMS ((enum dump_file_index
,
338 void (*) (FILE *, rtx
), rtx
));
340 /* Other flags saying which kinds of debugging dump have been requested. */
342 int rtl_dump_and_exit
;
343 int flag_print_asm_name
;
344 static int flag_print_mem
;
345 static int version_flag
;
346 static char *filename
;
347 enum graph_dump_types graph_dump_format
;
349 /* Name for output file of assembly code, specified with -o. */
353 /* Value of the -G xx switch, and whether it was passed or not. */
357 /* Type(s) of debugging information we are producing (if any).
358 See flags.h for the definitions of the different possible
359 types of debugging information. */
360 enum debug_info_type write_symbols
= NO_DEBUG
;
362 /* Level of debugging information we are producing. See flags.h
363 for the definitions of the different possible levels. */
364 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
366 /* Nonzero means use GNU-only extensions in the generated symbolic
367 debugging information. */
368 /* Currently, this only has an effect when write_symbols is set to
369 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
370 int use_gnu_debug_info_extensions
= 0;
372 /* Nonzero means do optimizations. -O.
373 Particular numeric values stand for particular amounts of optimization;
374 thus, -O2 stores 2 here. However, the optimizations beyond the basic
375 ones are not controlled directly by this variable. Instead, they are
376 controlled by individual `flag_...' variables that are defaulted
377 based on this variable. */
381 /* Nonzero means optimize for size. -Os.
382 The only valid values are zero and non-zero. When optimize_size is
383 non-zero, optimize defaults to 2, but certain individual code
384 bloating optimizations are disabled. */
386 int optimize_size
= 0;
388 /* Number of error messages and warning messages so far. */
391 int warningcount
= 0;
394 /* The FUNCTION_DECL for the function currently being compiled,
395 or 0 if between functions. */
396 tree current_function_decl
;
398 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
400 tree current_function_func_begin_label
;
402 /* Pointer to function to compute the name to use to print a declaration.
403 DECL is the declaration in question.
404 VERBOSITY determines what information will be printed:
405 0: DECL_NAME, demangled as necessary.
406 1: and scope information.
407 2: and any other information that might be interesting, such as function
408 parameter types in C++. */
410 const char *(*decl_printable_name
) PARAMS ((tree
, int));
412 /* Pointer to function to compute rtl for a language-specific tree code. */
414 typedef rtx (*lang_expand_expr_t
)
415 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
416 enum expand_modifier modifier
));
418 lang_expand_expr_t lang_expand_expr
= 0;
420 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
422 /* Pointer to function to finish handling an incomplete decl at the
423 end of compilation. */
425 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
427 /* Nonzero if doing dwarf2 duplicate elimination. */
429 int flag_eliminate_dwarf2_dups
= 0;
431 /* Nonzero if generating code to do profiling. */
433 int profile_flag
= 0;
435 /* Nonzero if generating code to do profiling on a line-by-line basis. */
437 int profile_block_flag
;
439 /* Nonzero if generating code to profile program flow graph arcs. */
441 int profile_arc_flag
= 0;
443 /* Nonzero if generating info for gcov to calculate line test coverage. */
445 int flag_test_coverage
= 0;
447 /* Nonzero indicates that branch taken probabilities should be calculated. */
449 int flag_branch_probabilities
= 0;
451 /* Nonzero if basic blocks should be reordered. */
453 int flag_reorder_blocks
= 0;
455 /* Nonzero if registers should be renamed. */
457 int flag_rename_registers
= 0;
459 /* Nonzero for -pedantic switch: warn about anything
460 that standard spec forbids. */
464 /* Temporarily suppress certain warnings.
465 This is set while reading code from a system header file. */
467 int in_system_header
= 0;
469 /* Don't print functions as they are compiled. -quiet. */
473 /* Print times taken by the various passes. -ftime-report. */
477 /* Print memory still in use at end of compilation (which may have little
478 to do with peak memory consumption). -fmem-report. */
482 /* Non-zero means to collect statistics which might be expensive
483 and to print them when we are done. */
484 int flag_detailed_statistics
= 0;
489 /* Nonzero means `char' should be signed. */
491 int flag_signed_char
;
493 /* Nonzero means give an enum type only as many bytes as it needs. */
495 int flag_short_enums
;
497 /* Nonzero for -fcaller-saves: allocate values in regs that need to
498 be saved across function calls, if that produces overall better code.
499 Optional now, so people can test it. */
501 #ifdef DEFAULT_CALLER_SAVES
502 int flag_caller_saves
= 1;
504 int flag_caller_saves
= 0;
507 /* Nonzero if structures and unions should be returned in memory.
509 This should only be defined if compatibility with another compiler or
510 with an ABI is needed, because it results in slower code. */
512 #ifndef DEFAULT_PCC_STRUCT_RETURN
513 #define DEFAULT_PCC_STRUCT_RETURN 1
516 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
518 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
520 /* Nonzero for -fforce-mem: load memory value into a register
521 before arithmetic on it. This makes better cse but slower compilation. */
523 int flag_force_mem
= 0;
525 /* Nonzero for -fforce-addr: load memory address into a register before
526 reference to memory. This makes better cse but slower compilation. */
528 int flag_force_addr
= 0;
530 /* Nonzero for -fdefer-pop: don't pop args after each function call;
531 instead save them up to pop many calls' args with one insns. */
533 int flag_defer_pop
= 0;
535 /* Nonzero for -ffloat-store: don't allocate floats and doubles
536 in extended-precision registers. */
538 int flag_float_store
= 0;
540 /* Nonzero for -fcse-follow-jumps:
541 have cse follow jumps to do a more extensive job. */
543 int flag_cse_follow_jumps
;
545 /* Nonzero for -fcse-skip-blocks:
546 have cse follow a branch around a block. */
547 int flag_cse_skip_blocks
;
549 /* Nonzero for -fexpensive-optimizations:
550 perform miscellaneous relatively-expensive optimizations. */
551 int flag_expensive_optimizations
;
553 /* Nonzero for -fthread-jumps:
554 have jump optimize output of loop. */
556 int flag_thread_jumps
;
558 /* Nonzero enables strength-reduction in loop.c. */
560 int flag_strength_reduce
= 0;
562 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
563 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
564 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
567 int flag_unroll_loops
;
569 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
570 This is generally not a win. */
572 int flag_unroll_all_loops
;
574 /* Nonzero forces all invariant computations in loops to be moved
577 int flag_move_all_movables
= 0;
579 /* Nonzero forces all general induction variables in loops to be
582 int flag_reduce_all_givs
= 0;
584 /* Nonzero to perform full register move optimization passes. This is the
587 int flag_regmove
= 0;
589 /* Nonzero for -fwritable-strings:
590 store string constants in data segment and don't uniquize them. */
592 int flag_writable_strings
= 0;
594 /* Nonzero means don't put addresses of constant functions in registers.
595 Used for compiling the Unix kernel, where strange substitutions are
596 done on the assembly output. */
598 int flag_no_function_cse
= 0;
600 /* Nonzero for -fomit-frame-pointer:
601 don't make a frame pointer in simple functions that don't require one. */
603 int flag_omit_frame_pointer
= 0;
605 /* Nonzero means place each function into its own section on those platforms
606 which support arbitrary section names and unlimited numbers of sections. */
608 int flag_function_sections
= 0;
610 /* ... and similar for data. */
612 int flag_data_sections
= 0;
614 /* Nonzero to inhibit use of define_optimization peephole opts. */
616 int flag_no_peephole
= 0;
618 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
619 operations in the interest of optimization. For example it allows
620 GCC to assume arguments to sqrt are nonnegative numbers, allowing
621 faster code for sqrt to be generated. */
623 int flag_fast_math
= 0;
625 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
627 int flag_optimize_sibling_calls
= 0;
629 /* Nonzero means the front end generally wants `errno' maintained by math
630 operations, like built-in SQRT, unless overridden by flag_fast_math. */
632 int flag_errno_math
= 1;
634 /* 0 means straightforward implementation of complex divide acceptable.
635 1 means wide ranges of inputs must work for complex divide.
636 2 means C99-like requirements for complex divide (not yet implemented). */
638 int flag_complex_divide_method
= 0;
640 /* Nonzero means all references through pointers are volatile. */
644 /* Nonzero means treat all global and extern variables as volatile. */
646 int flag_volatile_global
;
648 /* Nonzero means treat all static variables as volatile. */
650 int flag_volatile_static
;
652 /* Nonzero means just do syntax checking; don't output anything. */
654 int flag_syntax_only
= 0;
656 /* Nonzero means perform global cse. */
658 static int flag_gcse
;
660 /* Nonzero means to use global dataflow analysis to eliminate
661 useless null pointer tests. */
663 static int flag_delete_null_pointer_checks
;
665 /* Nonzero means to rerun cse after loop optimization. This increases
666 compilation time about 20% and picks up a few more common expressions. */
668 static int flag_rerun_cse_after_loop
;
670 /* Nonzero means to run loop optimizations twice. */
672 int flag_rerun_loop_opt
;
674 /* Nonzero for -finline-functions: ok to inline functions that look like
675 good inline candidates. */
677 int flag_inline_functions
;
679 /* Nonzero for -fkeep-inline-functions: even if we make a function
680 go inline everywhere, keep its definition around for debugging
683 int flag_keep_inline_functions
;
685 /* Nonzero means that functions will not be inlined. */
689 /* Nonzero means that we should emit static const variables
690 regardless of whether or not optimization is turned on. */
692 int flag_keep_static_consts
= 1;
694 /* Nonzero means we should be saving declaration info into a .X file. */
696 int flag_gen_aux_info
= 0;
698 /* Specified name of aux-info file. */
700 static char *aux_info_file_name
;
702 /* Nonzero means make the text shared if supported. */
704 int flag_shared_data
;
706 /* Nonzero means schedule into delayed branch slots if supported. */
708 int flag_delayed_branch
;
710 /* Nonzero if we are compiling pure (sharable) code.
711 Value is 1 if we are doing reasonable (i.e. simple
712 offset into offset table) pic. Value is 2 if we can
713 only perform register offsets. */
717 /* Nonzero means generate extra code for exception handling and enable
718 exception handling. */
722 /* Nonzero means use the new model for exception handling. Replaces
723 -DNEW_EH_MODEL as a compile option. */
725 int flag_new_exceptions
= 1;
727 /* Nonzero means generate frame unwind info table when supported. */
729 int flag_unwind_tables
= 0;
731 /* Nonzero means don't place uninitialized global data in common storage
736 /* Nonzero means pretend it is OK to examine bits of target floats,
737 even if that isn't true. The resulting code will have incorrect constants,
738 but the same series of instructions that the native compiler would make. */
740 int flag_pretend_float
;
742 /* Nonzero means change certain warnings into errors.
743 Usually these are warnings about failure to conform to some standard. */
745 int flag_pedantic_errors
= 0;
747 /* flag_schedule_insns means schedule insns within basic blocks (before
749 flag_schedule_insns_after_reload means schedule insns after
752 int flag_schedule_insns
= 0;
753 int flag_schedule_insns_after_reload
= 0;
755 /* The following flags have effect only for scheduling before register
758 flag_schedule_interblock means schedule insns accross basic blocks.
759 flag_schedule_speculative means allow speculative motion of non-load insns.
760 flag_schedule_speculative_load means allow speculative motion of some
762 flag_schedule_speculative_load_dangerous allows speculative motion of more
765 int flag_schedule_interblock
= 1;
766 int flag_schedule_speculative
= 1;
767 int flag_schedule_speculative_load
= 0;
768 int flag_schedule_speculative_load_dangerous
= 0;
770 int flag_single_precision_constant
;
772 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
773 by a cheaper branch on a count register. */
774 int flag_branch_on_count_reg
= 1;
776 /* -finhibit-size-directive inhibits output of .size for ELF.
777 This is used only for compiling crtstuff.c,
778 and it may be extended to other effects
779 needed for crtstuff.c on other systems. */
780 int flag_inhibit_size_directive
= 0;
782 /* -fverbose-asm causes extra commentary information to be produced in
783 the generated assembly code (to make it more readable). This option
784 is generally only of use to those who actually need to read the
785 generated assembly code (perhaps while debugging the compiler itself).
786 -fno-verbose-asm, the default, causes the extra information
787 to be omitted and is useful when comparing two assembler files. */
789 int flag_verbose_asm
= 0;
791 /* -dA causes debug commentary information to be produced in
792 the generated assembly code (to make it more readable). This option
793 is generally only of use to those who actually need to read the
794 generated assembly code (perhaps while debugging the compiler itself).
795 Currently, this switch is only used by dwarfout.c; however, it is intended
796 to be a catchall for printing debug information in the assembler file. */
798 int flag_debug_asm
= 0;
800 /* -dP causes the rtl to be emitted as a comment in assembly. */
802 int flag_dump_rtl_in_asm
= 0;
804 /* -fgnu-linker specifies use of the GNU linker for initializations.
805 (Or, more generally, a linker that handles initializations.)
806 -fno-gnu-linker says that collect2 will be used. */
808 int flag_gnu_linker
= 0;
810 int flag_gnu_linker
= 1;
816 /* Enable dead code elimination. */
819 /* Tag all structures with __attribute__(packed). */
820 int flag_pack_struct
= 0;
822 /* Emit code to check for stack overflow; also may cause large objects
823 to be allocated dynamically. */
824 int flag_stack_check
;
826 /* When non-NULL, indicates that whenever space is allocated on the
827 stack, the resulting stack pointer must not pass this
828 address---that is, for stacks that grow downward, the stack pointer
829 must always be greater than or equal to this address; for stacks
830 that grow upward, the stack pointer must be less than this address.
831 At present, the rtx may be either a REG or a SYMBOL_REF, although
832 the support provided depends on the backend. */
835 /* -fcheck-memory-usage causes extra code to be generated in order to check
836 memory accesses. This is used by a detector of bad memory accesses such
838 int flag_check_memory_usage
= 0;
840 /* -fprefix-function-name causes function name to be prefixed. This
841 can be used with -fcheck-memory-usage to isolate code compiled with
842 -fcheck-memory-usage. */
843 int flag_prefix_function_name
= 0;
845 /* 0 if pointer arguments may alias each other. True in C.
846 1 if pointer arguments may not alias each other but may alias
848 2 if pointer arguments may not alias each other and may not
849 alias global variables. True in Fortran.
850 This defaults to 0 for C. */
851 int flag_argument_noalias
= 0;
853 /* Nonzero if we should do (language-dependent) alias analysis.
854 Typically, this analysis will assume that expressions of certain
855 types do not alias expressions of certain other types. Only used
856 if alias analysis (in general) is enabled. */
857 int flag_strict_aliasing
= 0;
859 /* Instrument functions with calls at entry and exit, for profiling. */
860 int flag_instrument_function_entry_exit
= 0;
862 /* Nonzero means ignore `#ident' directives. 0 means handle them.
863 On SVR4 targets, it also controls whether or not to emit a
864 string identifying the compiler. */
866 int flag_no_ident
= 0;
868 /* This will perform a peephole pass before sched2. */
869 int flag_peephole2
= 0;
871 /* -fbounded-pointers causes gcc to compile pointers as composite
872 objects occupying three words: the pointer value, the base address
873 of the referent object, and the address immediately beyond the end
874 of the referent object. The base and extent allow us to perform
875 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
876 int flag_bounded_pointers
= 0;
878 /* -fcheck-bounds causes gcc to generate array bounds checks.
879 For C, C++: defaults to value of flag_bounded_pointers.
880 For ObjC: defaults to off.
881 For Java: defaults to on.
882 For Fortran: defaults to off.
883 For CHILL: defaults to off. */
884 int flag_bounds_check
= 0;
886 /* If one, renumber instruction UIDs to reduce the number of
887 unused UIDs if there are a lot of instructions. If greater than
888 one, unconditionally renumber instruction UIDs. */
889 int flag_renumber_insns
= 1;
891 /* Values of the -falign-* flags: how much to align labels in code.
892 0 means `use default', 1 means `don't align'.
893 For each variable, there is an _log variant which is the power
894 of two not less than the variable, for .align output. */
901 int align_labels_log
;
903 int align_functions_log
;
905 /* Table of supported debugging formats. */
909 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
910 constant expression, we use NO_DEBUG in its place. */
911 enum debug_info_type debug_type
;
912 int use_extensions_p
;
913 const char *description
;
917 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
918 "Generate default debug format output" },
919 { "gdb", NO_DEBUG
, 1, "Generate default extended debug format output" },
920 #ifdef DBX_DEBUGGING_INFO
921 { "stabs", DBX_DEBUG
, 0, "Generate STABS format debug output" },
922 { "stabs+", DBX_DEBUG
, 1, "Generate extended STABS format debug output" },
924 #ifdef DWARF_DEBUGGING_INFO
925 { "dwarf", DWARF_DEBUG
, 0, "Generate DWARF-1 format debug output"},
926 { "dwarf+", DWARF_DEBUG
, 1,
927 "Generated extended DWARF-1 format debug output" },
929 #ifdef DWARF2_DEBUGGING_INFO
930 { "dwarf-2", DWARF2_DEBUG
, 0, "Enable DWARF-2 debug output" },
932 #ifdef XCOFF_DEBUGGING_INFO
933 { "xcoff", XCOFF_DEBUG
, 0, "Generate XCOFF format debug output" },
934 { "xcoff+", XCOFF_DEBUG
, 1, "Generate extended XCOFF format debug output" },
936 #ifdef SDB_DEBUGGING_INFO
937 { "coff", SDB_DEBUG
, 0, "Generate COFF format debug output" },
947 const char *description
;
949 lang_independent_options
;
953 /* Add or remove a leading underscore from user symbols. */
954 int flag_leading_underscore
= -1;
956 /* The user symbol prefix after having resolved same. */
957 const char *user_label_prefix
;
959 /* A default for same. */
960 #ifndef USER_LABEL_PREFIX
961 #define USER_LABEL_PREFIX ""
964 /* Table of language-independent -f options.
965 STRING is the option name. VARIABLE is the address of the variable.
966 ON_VALUE is the value to store in VARIABLE
967 if `-fSTRING' is seen as an option.
968 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
970 lang_independent_options f_options
[] =
972 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
973 "Perform DWARF2 duplicate elimination"},
974 {"float-store", &flag_float_store
, 1,
975 "Do not store floats in registers" },
976 {"volatile", &flag_volatile
, 1,
977 "Consider all mem refs through pointers as volatile"},
978 {"volatile-global", &flag_volatile_global
, 1,
979 "Consider all mem refs to global data to be volatile" },
980 {"volatile-static", &flag_volatile_static
, 1,
981 "Consider all mem refs to static data to be volatile" },
982 {"defer-pop", &flag_defer_pop
, 1,
983 "Defer popping functions args from stack until later" },
984 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
985 "When possible do not generate stack frames"},
986 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
987 "Optimize sibling and tail recursive calls" },
988 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
989 "When running CSE, follow jumps to their targets" },
990 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
991 "When running CSE, follow conditional jumps" },
992 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
993 "Perform a number of minor, expensive optimisations" },
994 {"thread-jumps", &flag_thread_jumps
, 1,
995 "Perform jump threading optimisations"},
996 {"strength-reduce", &flag_strength_reduce
, 1,
997 "Perform strength reduction optimisations" },
998 {"unroll-loops", &flag_unroll_loops
, 1,
999 "Perform loop unrolling when iteration count is known" },
1000 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1001 "Perform loop unrolling for all loops" },
1002 {"move-all-movables", &flag_move_all_movables
, 1,
1003 "Force all loop invariant computations out of loops" },
1004 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1005 "Strength reduce all loop general induction variables" },
1006 {"writable-strings", &flag_writable_strings
, 1,
1007 "Store strings in writable data section" },
1008 {"peephole", &flag_no_peephole
, 0,
1009 "Enable machine specific peephole optimisations" },
1010 {"force-mem", &flag_force_mem
, 1,
1011 "Copy memory operands into registers before using" },
1012 {"force-addr", &flag_force_addr
, 1,
1013 "Copy memory address constants into regs before using" },
1014 {"function-cse", &flag_no_function_cse
, 0,
1015 "Allow function addresses to be held in registers" },
1016 {"inline-functions", &flag_inline_functions
, 1,
1017 "Integrate simple functions into their callers" },
1018 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1019 "Generate code for funcs even if they are fully inlined" },
1020 {"inline", &flag_no_inline
, 0,
1021 "Pay attention to the 'inline' keyword"},
1022 {"keep-static-consts", &flag_keep_static_consts
, 1,
1023 "Emit static const variables even if they are not used" },
1024 {"syntax-only", &flag_syntax_only
, 1,
1025 "Check for syntax errors, then stop" },
1026 {"shared-data", &flag_shared_data
, 1,
1027 "Mark data as shared rather than private" },
1028 {"caller-saves", &flag_caller_saves
, 1,
1029 "Enable saving registers around function calls" },
1030 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1031 "Return 'short' aggregates in memory, not registers" },
1032 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1033 "Return 'short' aggregates in registers" },
1034 {"delayed-branch", &flag_delayed_branch
, 1,
1035 "Attempt to fill delay slots of branch instructions" },
1036 {"gcse", &flag_gcse
, 1,
1037 "Perform the global common subexpression elimination" },
1038 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1039 "Run CSE pass after loop optimisations"},
1040 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1041 "Run the loop optimiser twice"},
1042 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1043 "Delete useless null pointer checks" },
1044 {"pretend-float", &flag_pretend_float
, 1,
1045 "Pretend that host and target use the same FP format"},
1046 {"schedule-insns", &flag_schedule_insns
, 1,
1047 "Reschedule instructions to avoid pipeline stalls"},
1048 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1049 "Run two passes of the instruction scheduler"},
1050 {"sched-interblock",&flag_schedule_interblock
, 1,
1051 "Enable scheduling across basic blocks" },
1052 {"sched-spec",&flag_schedule_speculative
, 1,
1053 "Allow speculative motion of non-loads" },
1054 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1055 "Allow speculative motion of some loads" },
1056 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1057 "Allow speculative motion of more loads" },
1058 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1059 "Replace add,compare,branch with branch on count reg"},
1060 {"pic", &flag_pic
, 1,
1061 "Generate position independent code, if possible"},
1062 {"PIC", &flag_pic
, 2, ""},
1063 {"exceptions", &flag_exceptions
, 1,
1064 "Enable exception handling" },
1065 {"new-exceptions", &flag_new_exceptions
, 1,
1066 "Use the new model for exception handling" },
1067 {"unwind-tables", &flag_unwind_tables
, 1,
1068 "Just generate unwind tables for exception handling" },
1069 {"sjlj-exceptions", &exceptions_via_longjmp
, 1,
1070 "Use setjmp/longjmp to handle exceptions" },
1071 {"asynchronous-exceptions", &asynchronous_exceptions
, 1,
1072 "Support asynchronous exceptions" },
1073 {"profile-arcs", &profile_arc_flag
, 1,
1074 "Insert arc based program profiling code" },
1075 {"test-coverage", &flag_test_coverage
, 1,
1076 "Create data files needed by gcov" },
1077 {"branch-probabilities", &flag_branch_probabilities
, 1,
1078 "Use profiling information for branch probabilities" },
1079 {"reorder-blocks", &flag_reorder_blocks
, 1,
1080 "Reorder basic blocks to improve code placement" },
1081 {"rename-registers", &flag_rename_registers
, 1,
1082 "Do the register renaming optimization pass"},
1083 {"fast-math", &flag_fast_math
, 1,
1084 "Improve FP speed by violating ANSI & IEEE rules" },
1085 {"common", &flag_no_common
, 0,
1086 "Do not put unitialised globals in the common section" },
1087 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1088 "Do not generate .size directives" },
1089 {"function-sections", &flag_function_sections
, 1,
1090 "place each function into its own section" },
1091 {"data-sections", &flag_data_sections
, 1,
1092 "place data items into their own section" },
1093 {"verbose-asm", &flag_verbose_asm
, 1,
1094 "Add extra commentry to assembler output"},
1095 {"gnu-linker", &flag_gnu_linker
, 1,
1096 "Output GNU ld formatted global initialisers"},
1097 {"regmove", &flag_regmove
, 1,
1098 "Enables a register move optimisation"},
1099 {"optimize-register-move", &flag_regmove
, 1,
1100 "Do the full regmove optimization pass"},
1101 {"pack-struct", &flag_pack_struct
, 1,
1102 "Pack structure members together without holes" },
1103 {"stack-check", &flag_stack_check
, 1,
1104 "Insert stack checking code into the program" },
1105 {"argument-alias", &flag_argument_noalias
, 0,
1106 "Specify that arguments may alias each other & globals"},
1107 {"argument-noalias", &flag_argument_noalias
, 1,
1108 "Assume arguments may alias globals but not each other"},
1109 {"argument-noalias-global", &flag_argument_noalias
, 2,
1110 "Assume arguments do not alias each other or globals" },
1111 {"strict-aliasing", &flag_strict_aliasing
, 1,
1112 "Assume strict aliasing rules apply" },
1113 {"align-loops", &align_loops
, 0,
1114 "Align the start of loops" },
1115 {"align-jumps", &align_jumps
, 0,
1116 "Align labels which are only reached by jumping" },
1117 {"align-labels", &align_labels
, 0,
1118 "Align all labels" },
1119 {"align-functions", &align_functions
, 0,
1120 "Align the start of functions" },
1121 {"check-memory-usage", &flag_check_memory_usage
, 1,
1122 "Generate code to check every memory access" },
1123 {"prefix-function-name", &flag_prefix_function_name
, 1,
1124 "Add a prefix to all function names" },
1125 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1126 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1127 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1128 "Instrument function entry/exit with profiling calls"},
1129 {"ssa", &flag_ssa
, 1,
1130 "Enable SSA optimizations" },
1131 {"dce", &flag_dce
, 1,
1132 "Enable dead code elimination" },
1133 {"leading-underscore", &flag_leading_underscore
, 1,
1134 "External symbols have a leading underscore" },
1135 {"ident", &flag_no_ident
, 0,
1136 "Process #ident directives"},
1137 { "peephole2", &flag_peephole2
, 1,
1138 "Enables an rtl peephole pass run before sched2" },
1139 {"math-errno", &flag_errno_math
, 1,
1140 "Set errno after built-in math functions"},
1141 {"bounded-pointers", &flag_bounded_pointers
, 1,
1142 "Compile pointers as triples: value, base & end" },
1143 {"bounds-check", &flag_bounds_check
, 1,
1144 "Generate code to check bounds before dereferencing pointers and arrays" },
1145 {"single-precision-constant", &flag_single_precision_constant
, 1,
1146 "Convert floating point constant to single precision constant"},
1147 {"time-report", &time_report
, 1,
1148 "Report time taken by each compiler pass at end of run"},
1149 {"mem-report", &mem_report
, 1,
1150 "Report on permanent memory allocation at end of run"},
1151 { "trapv", &flag_trapv
, 1,
1152 "Trap for signed overflow in addition / subtraction / multiplication." },
1155 /* Table of language-specific options. */
1157 static struct lang_opt
1160 const char *description
;
1162 documented_lang_options
[] =
1164 /* In order not to overload the --help output, the convention
1165 used here is to only describe those options which are not
1166 enabled by default. */
1168 { "-ansi", "Compile just for ISO C89" },
1169 { "-fallow-single-precision",
1170 "Do not promote floats to double if using -traditional" },
1171 { "-std= ", "Determine language standard"},
1173 { "-fsigned-bitfields", "" },
1174 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1175 { "-fno-signed-bitfields", "" },
1176 { "-fno-unsigned-bitfields","" },
1177 { "-fsigned-char", "Make 'char' be signed by default"},
1178 { "-funsigned-char", "Make 'char' be unsigned by default"},
1179 { "-fno-signed-char", "" },
1180 { "-fno-unsigned-char", "" },
1182 { "-ftraditional", "" },
1183 { "-traditional", "Attempt to support traditional K&R style C"},
1184 { "-fnotraditional", "" },
1185 { "-fno-traditional", "" },
1188 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1189 { "-fbuiltin", "" },
1190 { "-fno-builtin", "Do not recognise any built in functions" },
1191 { "-fhosted", "Assume normal C execution environment" },
1192 { "-fno-hosted", "" },
1194 "Assume that standard libraries & main might not exist" },
1195 { "-fno-freestanding", "" },
1196 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1197 { "-fno-cond-mismatch", "" },
1198 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1199 { "-fno-dollars-in-identifiers", "" },
1200 { "-fpreprocessed", "" },
1201 { "-fno-preprocessed", "" },
1202 { "-fshort-double", "Use the same size for double as for float" },
1203 { "-fno-short-double", "" },
1204 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1205 { "-fno-short-enums", "" },
1206 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1207 { "-fno-short-wchar", "" },
1209 { "-Wall", "Enable most warning messages" },
1210 { "-Wbad-function-cast",
1211 "Warn about casting functions to incompatible types" },
1212 { "-Wno-bad-function-cast", "" },
1213 { "-Wmissing-noreturn",
1214 "Warn about functions which might be candidates for attribute noreturn" },
1215 { "-Wno-missing-noreturn", "" },
1216 { "-Wmissing-format-attribute",
1217 "Warn about functions which might be candidates for format attributes" },
1218 { "-Wno-missing-format-attribute", "" },
1219 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1220 { "-Wno-cast-qual", "" },
1221 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1222 { "-Wno-char-subscripts", "" },
1223 { "-Wcomment", "Warn if nested comments are detected" },
1224 { "-Wno-comment", "" },
1225 { "-Wcomments", "Warn if nested comments are detected" },
1226 { "-Wno-comments", "" },
1227 { "-Wconversion", "Warn about possibly confusing type conversions" },
1228 { "-Wno-conversion", "" },
1229 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1230 { "-Wno-format", "" },
1231 { "-Wformat-y2k", "" },
1232 { "-Wno-format-y2k",
1233 "Don't warn about strftime formats yielding 2 digit years" },
1234 { "-Wformat-extra-args", "" },
1235 { "-Wno-format-extra-args",
1236 "Don't warn about too many arguments to format functions" },
1237 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1238 { "-Wno-format-nonliteral", "" },
1239 { "-Wformat-security",
1240 "Warn about possible security problems with format functions" },
1241 { "-Wno-format-security", "" },
1242 { "-Wimplicit-function-declaration",
1243 "Warn about implicit function declarations" },
1244 { "-Wno-implicit-function-declaration", "" },
1245 { "-Werror-implicit-function-declaration", "" },
1246 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1247 { "-Wno-implicit-int", "" },
1248 { "-Wimplicit", "" },
1249 { "-Wno-implicit", "" },
1250 { "-Wimport", "Warn about the use of the #import directive" },
1251 { "-Wno-import", "" },
1252 { "-Wlong-long","" },
1253 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1254 { "-Wmain", "Warn about suspicious declarations of main" },
1255 { "-Wno-main", "" },
1256 { "-Wmissing-braces",
1257 "Warn about possibly missing braces around initialisers" },
1258 { "-Wno-missing-braces", "" },
1259 { "-Wmissing-declarations",
1260 "Warn about global funcs without previous declarations"},
1261 { "-Wno-missing-declarations", "" },
1262 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1263 { "-Wno-missing-prototypes", "" },
1264 { "-Wmultichar", "Warn about use of multicharacter literals"},
1265 { "-Wno-multichar", "" },
1266 { "-Wnested-externs", "Warn about externs not at file scope level" },
1267 { "-Wno-nested-externs", "" },
1268 { "-Wparentheses", "Warn about possible missing parentheses" },
1269 { "-Wno-parentheses", "" },
1270 { "-Wsequence-point",
1271 "Warn about possible violations of sequence point rules" },
1272 { "-Wno-sequence-point", "" },
1273 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1274 { "-Wno-pointer-arith", "" },
1275 { "-Wredundant-decls",
1276 "Warn about multiple declarations of the same object" },
1277 { "-Wno-redundant-decls", "" },
1278 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1279 { "-Wno-sign-compare", "" },
1280 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1281 { "-Wno-float-equal", "" },
1282 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1283 { "-Wno-unknown-pragmas", "" },
1284 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1285 { "-Wno-strict-prototypes", "" },
1286 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1287 { "-Wno-traditional", "" },
1288 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1289 { "-Wno-trigraphs", "" },
1291 { "-Wno-undef", "" },
1292 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1293 { "-Wno-write-strings", "" },
1295 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1297 #include "options.h"
1301 /* Here is a table, controlled by the tm.h file, listing each -m switch
1302 and which bits in `target_switches' it should set or clear.
1303 If VALUE is positive, it is bits to set.
1304 If VALUE is negative, -VALUE is bits to clear.
1305 (The sign bit is not used so there is no confusion.) */
1311 const char *description
;
1313 target_switches
[] = TARGET_SWITCHES
;
1315 /* This table is similar, but allows the switch to have a value. */
1317 #ifdef TARGET_OPTIONS
1321 const char **variable
;
1322 const char *description
;
1324 target_options
[] = TARGET_OPTIONS
;
1327 /* Options controlling warnings. */
1329 /* Don't print warning messages. -w. */
1331 int inhibit_warnings
= 0;
1333 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1335 int warn_system_headers
= 0;
1337 /* Print various extra warnings. -W. */
1339 int extra_warnings
= 0;
1341 /* Treat warnings as errors. -Werror. */
1343 int warnings_are_errors
= 0;
1345 /* Nonzero to warn about unused variables, functions et.al. */
1347 int warn_unused_function
;
1348 int warn_unused_label
;
1349 int warn_unused_parameter
;
1350 int warn_unused_variable
;
1351 int warn_unused_value
;
1354 set_Wunused (setting
)
1357 warn_unused_function
= setting
;
1358 warn_unused_label
= setting
;
1359 /* Unused function parameter warnings are reported when either ``-W
1360 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1361 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1363 warn_unused_parameter
= 0;
1364 else if (!warn_unused_parameter
)
1365 warn_unused_parameter
= -1;
1366 warn_unused_variable
= setting
;
1367 warn_unused_value
= setting
;
1370 /* Nonzero to warn about code which is never reached. */
1372 int warn_notreached
;
1374 /* Nonzero to warn about variables used before they are initialized. */
1376 int warn_uninitialized
;
1378 /* Nonzero means warn about all declarations which shadow others. */
1382 /* Warn if a switch on an enum fails to have a case for every enum value. */
1386 /* Nonzero means warn about function definitions that default the return type
1387 or that use a null return and have a return-type other than void. */
1389 int warn_return_type
;
1391 /* Nonzero means warn about pointer casts that increase the required
1392 alignment of the target type (and might therefore lead to a crash
1393 due to a misaligned access). */
1395 int warn_cast_align
;
1397 /* Nonzero means warn about any identifiers that match in the first N
1398 characters. The value N is in `id_clash_len'. */
1403 /* Nonzero means warn about any objects definitions whose size is larger
1404 than N bytes. Also want about function definitions whose returned
1405 values are larger than N bytes. The value N is in `larger_than_size'. */
1407 int warn_larger_than
;
1408 HOST_WIDE_INT larger_than_size
;
1410 /* Nonzero means warn if inline function is too large. */
1414 /* Warn if a function returns an aggregate,
1415 since there are often incompatible calling conventions for doing this. */
1417 int warn_aggregate_return
;
1419 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1423 /* Warn when gcc pads a structure to an alignment boundary. */
1427 /* Warn when an optimization pass is disabled. */
1429 int warn_disabled_optimization
;
1431 /* Warn about functions which might be candidates for attribute noreturn. */
1433 int warn_missing_noreturn
;
1435 /* Likewise for -W. */
1437 lang_independent_options W_options
[] =
1439 {"unused-function", &warn_unused_function
, 1, "Warn when a function is unused" },
1440 {"unused-label", &warn_unused_label
, 1, "Warn when a label is unused" },
1441 {"unused-parameter", &warn_unused_parameter
, 1, "Warn when a function parameter is unused" },
1442 {"unused-variable", &warn_unused_variable
, 1, "Warn when a variable is unused" },
1443 {"unused-value", &warn_unused_value
, 1, "Warn when an expression value is unused" },
1444 {"system-headers", &warn_system_headers
, 1, "Do not suppress warnings from system headers"},
1445 {"error", &warnings_are_errors
, 1, ""},
1446 {"shadow", &warn_shadow
, 1, "Warn when one local variable shadows another" },
1447 {"switch", &warn_switch
, 1,
1448 "Warn about enumerated switches missing a specific case" },
1449 {"aggregate-return", &warn_aggregate_return
, 1,
1450 "Warn about returning structures, unions or arrays" },
1451 {"cast-align", &warn_cast_align
, 1,
1452 "Warn about pointer casts which increase alignment" },
1453 {"unreachable-code", &warn_notreached
, 1,
1454 "Warn about code that will never be executed" },
1455 {"uninitialized", &warn_uninitialized
, 1,
1456 "Warn about unitialized automatic variables"},
1457 {"inline", &warn_inline
, 1,
1458 "Warn when an inlined function cannot be inlined"},
1459 {"packed", &warn_packed
, 1,
1460 "Warn when the packed attribute has no effect on struct layout"},
1461 {"padded", &warn_padded
, 1,
1462 "Warn when padding is required to align struct members"},
1463 {"disabled-optimization", &warn_disabled_optimization
, 1,
1464 "Warn when an optimization pass is disabled"}
1467 /* Output files for assembler code (real compiler output)
1468 and debugging dumps. */
1471 FILE *aux_info_file
;
1472 FILE *rtl_dump_file
= NULL
;
1474 /* Decode the string P as an integral parameter.
1475 If the string is indeed an integer return its numeric value else
1476 issue an Invalid Option error for the option PNAME and return DEFVAL.
1477 If PNAME is zero just return DEFVAL, do not call error. */
1480 read_integral_parameter (p
, pname
, defval
)
1485 const char *endp
= p
;
1489 if (*endp
>= '0' && *endp
<= '9')
1498 error ("Invalid option `%s'", pname
);
1506 /* This is the default decl_printable_name function. */
1509 decl_name (decl
, verbosity
)
1511 int verbosity ATTRIBUTE_UNUSED
;
1513 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1517 /* This calls abort and is used to avoid problems when abort if a macro.
1518 It is used when we need to pass the address of abort. */
1526 /* When `malloc.c' is compiled with `rcheck' defined,
1527 it calls this function to report clobberage. */
1531 const char *s ATTRIBUTE_UNUSED
;
1536 /* Return the logarithm of X, base 2, considering X unsigned,
1537 if X is a power of 2. Otherwise, returns -1.
1539 This should be used via the `exact_log2' macro. */
1543 register unsigned HOST_WIDE_INT x
;
1545 register int log
= 0;
1546 /* Test for 0 or a power of 2. */
1547 if (x
== 0 || x
!= (x
& -x
))
1549 while ((x
>>= 1) != 0)
1554 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1555 If X is 0, return -1.
1557 This should be used via the floor_log2 macro. */
1561 register unsigned HOST_WIDE_INT x
;
1563 register int log
= -1;
1570 /* Return the approximate positive square root of a number N. This is for
1571 statistical reports, not code generation. */
1586 d
= (s
* s
- x
) / (2 * s
);
1593 static int float_handler_set
;
1595 jmp_buf float_handler
;
1597 /* Signals actually come here. */
1600 float_signal (signo
)
1601 /* If this is missing, some compilers complain. */
1602 int signo ATTRIBUTE_UNUSED
;
1604 if (float_handled
== 0)
1605 crash_signal (signo
);
1606 #if defined (USG) || defined (hpux)
1607 /* Re-enable the signal catcher. */
1608 signal (SIGFPE
, float_signal
);
1611 signal (SIGFPE
, float_signal
);
1612 longjmp (float_handler
, 1);
1615 /* Specify where to longjmp to when a floating arithmetic error happens.
1616 If HANDLER is 0, it means don't handle the errors any more. */
1619 set_float_handler (handler
)
1622 float_handled
= (handler
!= 0);
1624 bcopy ((char *) handler
, (char *) float_handler
, sizeof (float_handler
));
1626 if (float_handled
&& ! float_handler_set
)
1628 signal (SIGFPE
, float_signal
);
1629 float_handler_set
= 1;
1633 /* This is a wrapper function for code which might elicit an
1634 arithmetic exception. That code should be passed in as a function
1635 pointer FN, and one argument DATA. DATA is usually a struct which
1636 contains the real input and output for function FN. This function
1637 returns 0 (failure) if longjmp was called (i.e. an exception
1638 occured.) It returns 1 (success) otherwise. */
1641 do_float_handler (fn
, data
)
1642 void (*fn
) PARAMS ((PTR
));
1649 /* We got here via longjmp () caused by an exception in function
1651 set_float_handler (NULL
);
1655 set_float_handler (buf
);
1657 set_float_handler (NULL
);
1661 /* Specify, in HANDLER, where to longjmp to when a floating arithmetic
1662 error happens, pushing the previous specification into OLD_HANDLER.
1663 Return an indication of whether there was a previous handler in effect. */
1666 push_float_handler (handler
, old_handler
)
1667 jmp_buf handler
, old_handler
;
1669 int was_handled
= float_handled
;
1673 memcpy ((char *) old_handler
, (char *) float_handler
,
1674 sizeof (float_handler
));
1676 memcpy ((char *) float_handler
, (char *) handler
, sizeof (float_handler
));
1680 /* Restore the previous specification of whether and where to longjmp to
1681 when a floating arithmetic error happens. */
1684 pop_float_handler (handled
, handler
)
1688 float_handled
= handled
;
1690 bcopy ((char *) handler
, (char *) float_handler
, sizeof (float_handler
));
1693 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1694 into ICE messages, which is much more user friendly. */
1697 crash_signal (signo
)
1698 /* If this is missing, some compilers complain. */
1701 fatal ("Internal error: %s.", strsignal (signo
));
1704 /* Strip off a legitimate source ending from the input string NAME of
1705 length LEN. Rather than having to know the names used by all of
1706 our front ends, we strip off an ending of a period followed by
1707 up to five characters. (Java uses ".class".) */
1710 strip_off_ending (name
, len
)
1715 for (i
= 2; i
< 6 && len
> i
; i
++)
1717 if (name
[len
- i
] == '.')
1719 name
[len
- i
] = '\0';
1725 /* Given a file name X, return the nondirectory portion. */
1728 file_name_nondirectory (x
)
1731 char *tmp
= (char *) strrchr (x
, '/');
1732 if (DIR_SEPARATOR
!= '/' && ! tmp
)
1733 tmp
= (char *) strrchr (x
, DIR_SEPARATOR
);
1735 return (char *) (tmp
+ 1);
1740 /* Output a quoted string. */
1743 output_quoted_string (asm_file
, string
)
1747 #ifdef OUTPUT_QUOTED_STRING
1748 OUTPUT_QUOTED_STRING (asm_file
, string
);
1752 putc ('\"', asm_file
);
1753 while ((c
= *string
++) != 0)
1755 if (c
== '\"' || c
== '\\')
1756 putc ('\\', asm_file
);
1759 putc ('\"', asm_file
);
1763 /* Output a file name in the form wanted by System V. */
1766 output_file_directive (asm_file
, input_name
)
1768 const char *input_name
;
1770 int len
= strlen (input_name
);
1771 const char *na
= input_name
+ len
;
1773 /* NA gets INPUT_NAME sans directory names. */
1774 while (na
> input_name
)
1776 if (IS_DIR_SEPARATOR (na
[-1]))
1781 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1782 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1784 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1785 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1787 fprintf (asm_file
, "\t.file\t");
1788 output_quoted_string (asm_file
, na
);
1789 fputc ('\n', asm_file
);
1794 #ifdef ASM_IDENTIFY_LANGUAGE
1795 /* Routine to build language identifier for object file. */
1798 output_lang_identify (asm_out_file
)
1801 int len
= strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1802 char *s
= (char *) alloca (len
);
1804 sprintf (s
, "__gnu_compiled_%s", lang_identify ());
1805 ASM_OUTPUT_LABEL (asm_out_file
, s
);
1809 /* Routine to open a dump file. Return true if the dump file is enabled. */
1812 open_dump_file (index
, decl
)
1813 enum dump_file_index index
;
1817 const char *open_arg
;
1820 if (! dump_file
[index
].enabled
)
1823 timevar_push (TV_DUMP
);
1824 if (rtl_dump_file
!= NULL
)
1825 fclose (rtl_dump_file
);
1827 sprintf (seq
, ".%02d.", index
);
1829 if (! dump_file
[index
].initialized
)
1831 /* If we've not initialized the files, do so now. */
1832 if (graph_dump_format
!= no_graph
1833 && dump_file
[index
].graph_dump_p
)
1835 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1836 clean_graph_dump_file (dump_base_name
, dump_name
);
1839 dump_file
[index
].initialized
= 1;
1845 dump_name
= concat (dump_base_name
, seq
,
1846 dump_file
[index
].extension
, NULL
);
1848 rtl_dump_file
= fopen (dump_name
, open_arg
);
1849 if (rtl_dump_file
== NULL
)
1850 pfatal_with_name (dump_name
);
1855 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1856 decl_printable_name (decl
, 2));
1858 timevar_pop (TV_DUMP
);
1862 /* Routine to close a dump file. */
1865 close_dump_file (index
, func
, insns
)
1866 enum dump_file_index index
;
1867 void (*func
) PARAMS ((FILE *, rtx
));
1870 if (! rtl_dump_file
)
1873 timevar_push (TV_DUMP
);
1875 && graph_dump_format
!= no_graph
1876 && dump_file
[index
].graph_dump_p
)
1881 sprintf (seq
, ".%02d.", index
);
1882 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1883 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1888 func (rtl_dump_file
, insns
);
1890 fflush (rtl_dump_file
);
1891 fclose (rtl_dump_file
);
1893 rtl_dump_file
= NULL
;
1894 timevar_pop (TV_DUMP
);
1897 /* Do any final processing required for the declarations in VEC, of
1898 which there are LEN. We write out inline functions and variables
1899 that have been deferred until this point, but which are required.
1900 Returns non-zero if anything was put out. */
1903 wrapup_global_declarations (vec
, len
)
1910 int output_something
= 0;
1912 for (i
= 0; i
< len
; i
++)
1916 /* We're not deferring this any longer. */
1917 DECL_DEFER_OUTPUT (decl
) = 0;
1919 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1920 && incomplete_decl_finalize_hook
!= 0)
1921 (*incomplete_decl_finalize_hook
) (decl
);
1924 /* Now emit any global variables or functions that we have been
1925 putting off. We need to loop in case one of the things emitted
1926 here references another one which comes earlier in the list. */
1930 for (i
= 0; i
< len
; i
++)
1934 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1937 /* Don't write out static consts, unless we still need them.
1939 We also keep static consts if not optimizing (for debugging),
1940 unless the user specified -fno-keep-static-consts.
1941 ??? They might be better written into the debug information.
1942 This is possible when using DWARF.
1944 A language processor that wants static constants to be always
1945 written out (even if it is not used) is responsible for
1946 calling rest_of_decl_compilation itself. E.g. the C front-end
1947 calls rest_of_decl_compilation from finish_decl.
1948 One motivation for this is that is conventional in some
1949 environments to write things like:
1950 static const char rcsid[] = "... version string ...";
1951 intending to force the string to be in the executable.
1953 A language processor that would prefer to have unneeded
1954 static constants "optimized away" would just defer writing
1955 them out until here. E.g. C++ does this, because static
1956 constants are often defined in header files.
1958 ??? A tempting alternative (for both C and C++) would be
1959 to force a constant to be written if and only if it is
1960 defined in a main file, as opposed to an include file. */
1962 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1963 && (! TREE_READONLY (decl
)
1964 || TREE_PUBLIC (decl
)
1966 && flag_keep_static_consts
1967 && !DECL_ARTIFICIAL (decl
))
1968 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1971 rest_of_decl_compilation (decl
, NULL_PTR
, 1, 1);
1974 if (TREE_CODE (decl
) == FUNCTION_DECL
1975 && DECL_INITIAL (decl
) != 0
1976 && DECL_SAVED_INSNS (decl
) != 0
1977 && (flag_keep_inline_functions
1978 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1982 output_inline_function (decl
);
1987 output_something
= 1;
1991 return output_something
;
1994 /* Issue appropriate warnings for the global declarations in VEC (of
1995 which there are LEN). Output debugging information for them. */
1998 check_global_declarations (vec
, len
)
2005 for (i
= 0; i
< len
; i
++)
2009 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2010 && ! TREE_ASM_WRITTEN (decl
))
2011 /* Cancel the RTL for this decl so that, if debugging info
2012 output for global variables is still to come,
2013 this one will be omitted. */
2014 DECL_RTL (decl
) = NULL
;
2016 /* Warn about any function
2017 declared static but not defined.
2018 We don't warn about variables,
2019 because many programs have static variables
2020 that exist only to get some text into the object file. */
2021 if (TREE_CODE (decl
) == FUNCTION_DECL
2022 && (warn_unused_function
2023 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2024 && DECL_INITIAL (decl
) == 0
2025 && DECL_EXTERNAL (decl
)
2026 && ! DECL_ARTIFICIAL (decl
)
2027 && ! TREE_PUBLIC (decl
))
2029 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2030 pedwarn_with_decl (decl
,
2031 "`%s' used but never defined");
2033 warning_with_decl (decl
,
2034 "`%s' declared `static' but never defined");
2035 /* This symbol is effectively an "extern" declaration now. */
2036 TREE_PUBLIC (decl
) = 1;
2037 assemble_external (decl
);
2040 /* Warn about static fns or vars defined but not used,
2041 but not about inline functions or static consts
2042 since defining those in header files is normal practice. */
2043 if (((warn_unused_function
2044 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2045 || (warn_unused_variable
2046 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2047 && ! DECL_IN_SYSTEM_HEADER (decl
)
2048 && ! DECL_EXTERNAL (decl
)
2049 && ! TREE_PUBLIC (decl
)
2050 && ! TREE_USED (decl
)
2051 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2052 /* The TREE_USED bit for file-scope decls
2053 is kept in the identifier, to handle multiple
2054 external decls in different scopes. */
2055 && ! TREE_USED (DECL_NAME (decl
)))
2056 warning_with_decl (decl
, "`%s' defined but not used");
2058 timevar_push (TV_SYMOUT
);
2059 #ifdef SDB_DEBUGGING_INFO
2060 /* The COFF linker can move initialized global vars to the end.
2061 And that can screw up the symbol ordering.
2062 By putting the symbols in that order to begin with,
2063 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2064 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2065 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2066 && ! DECL_EXTERNAL (decl
)
2067 && DECL_RTL (decl
) != 0)
2068 sdbout_symbol (decl
, 0);
2070 /* Output COFF information for non-global
2071 file-scope initialized variables. */
2072 if (write_symbols
== SDB_DEBUG
2073 && TREE_CODE (decl
) == VAR_DECL
2074 && DECL_INITIAL (decl
)
2075 && ! DECL_EXTERNAL (decl
)
2076 && DECL_RTL (decl
) != 0
2077 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2078 sdbout_toplevel_data (decl
);
2079 #endif /* SDB_DEBUGGING_INFO */
2080 #ifdef DWARF_DEBUGGING_INFO
2081 /* Output DWARF information for file-scope tentative data object
2082 declarations, file-scope (extern) function declarations (which
2083 had no corresponding body) and file-scope tagged type declarations
2084 and definitions which have not yet been forced out. */
2086 if (write_symbols
== DWARF_DEBUG
2087 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2088 dwarfout_file_scope_decl (decl
, 1);
2090 #ifdef DWARF2_DEBUGGING_INFO
2091 /* Output DWARF2 information for file-scope tentative data object
2092 declarations, file-scope (extern) function declarations (which
2093 had no corresponding body) and file-scope tagged type declarations
2094 and definitions which have not yet been forced out. */
2096 if (write_symbols
== DWARF2_DEBUG
2097 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2098 dwarf2out_decl (decl
);
2100 timevar_pop (TV_SYMOUT
);
2104 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2105 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2106 INPUT_FILENAME and LINENO accordingly. */
2109 push_srcloc (file
, line
)
2113 struct file_stack
*fs
;
2115 if (input_file_stack
)
2117 input_file_stack
->name
= input_filename
;
2118 input_file_stack
->line
= lineno
;
2121 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2122 fs
->name
= input_filename
= file
;
2123 fs
->line
= lineno
= line
;
2124 fs
->indent_level
= 0;
2125 fs
->next
= input_file_stack
;
2126 input_file_stack
= fs
;
2127 input_file_stack_tick
++;
2130 /* Pop the top entry off the stack of presently open source files.
2131 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2137 struct file_stack
*fs
;
2139 fs
= input_file_stack
;
2140 input_file_stack
= fs
->next
;
2142 input_file_stack_tick
++;
2143 /* The initial source file is never popped. */
2144 if (!input_file_stack
)
2146 input_filename
= input_file_stack
->name
;
2147 lineno
= input_file_stack
->line
;
2150 /* Compile an entire file of output from cpp, named NAME.
2151 Write a file of assembly output and various debugging dumps. */
2159 int name_specified
= name
!= 0;
2161 if (dump_base_name
== 0)
2162 dump_base_name
= name
? name
: "gccdump";
2167 /* Start timing total execution time. */
2170 timevar_start (TV_TOTAL
);
2172 /* Initialize data in various passes. */
2175 name
= init_parse (name
);
2176 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2177 || debug_info_level
== DINFO_LEVEL_VERBOSE
2178 || flag_test_coverage
2179 || warn_notreached
);
2182 init_decl_processing ();
2188 init_function_once ();
2189 init_stor_layout_once ();
2190 init_varasm_once ();
2192 /* The following initialization functions need to generate rtl, so
2193 provide a dummy function context for them. */
2194 init_dummy_function_start ();
2197 if (flag_caller_saves
)
2198 init_caller_save ();
2199 expand_dummy_function_end ();
2201 /* If auxiliary info generation is desired, open the output file.
2202 This goes in the same directory as the source file--unlike
2203 all the other output files. */
2204 if (flag_gen_aux_info
)
2206 aux_info_file
= fopen (aux_info_file_name
, "w");
2207 if (aux_info_file
== 0)
2208 pfatal_with_name (aux_info_file_name
);
2211 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2212 because then the driver will have provided the name of a temporary
2213 file or bit bucket for us. */
2215 if (! name_specified
&& asm_file_name
== 0)
2216 asm_out_file
= stdout
;
2219 if (asm_file_name
== 0)
2221 int len
= strlen (dump_base_name
);
2222 char *dumpname
= (char *) xmalloc (len
+ 6);
2223 memcpy (dumpname
, dump_base_name
, len
+ 1);
2224 strip_off_ending (dumpname
, len
);
2225 strcat (dumpname
, ".s");
2226 asm_file_name
= dumpname
;
2228 if (!strcmp (asm_file_name
, "-"))
2229 asm_out_file
= stdout
;
2231 asm_out_file
= fopen (asm_file_name
, "w");
2232 if (asm_out_file
== 0)
2233 pfatal_with_name (asm_file_name
);
2236 #ifdef IO_BUFFER_SIZE
2237 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2238 _IOFBF
, IO_BUFFER_SIZE
);
2242 name
= ggc_strdup (name
);
2244 input_filename
= name
;
2246 /* Put an entry on the input file stack for the main input file. */
2247 push_srcloc (input_filename
, 0);
2249 /* Perform language-specific initialization.
2250 This may set main_input_filename. */
2253 /* If the input doesn't start with a #line, use the input name
2254 as the official input file name. */
2255 if (main_input_filename
== 0)
2256 main_input_filename
= name
;
2258 if (flag_syntax_only
)
2260 write_symbols
= NO_DEBUG
;
2262 profile_block_flag
= 0;
2266 ASM_FILE_START (asm_out_file
);
2268 #ifdef ASM_COMMENT_START
2269 if (flag_verbose_asm
)
2271 /* Print the list of options in effect. */
2272 print_version (asm_out_file
, ASM_COMMENT_START
);
2273 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2274 ASM_COMMENT_START
, " ", "\n");
2275 /* Add a blank line here so it appears in assembler output but not
2277 fprintf (asm_out_file
, "\n");
2281 /* Output something to inform GDB that this compilation was by GCC. */
2282 #ifndef ASM_IDENTIFY_GCC
2283 fprintf (asm_out_file
, "gcc2_compiled.:\n");
2285 ASM_IDENTIFY_GCC (asm_out_file
);
2288 /* Output something to identify which front-end produced this file. */
2289 #ifdef ASM_IDENTIFY_LANGUAGE
2290 ASM_IDENTIFY_LANGUAGE (asm_out_file
);
2292 } /* ! flag_syntax_only */
2294 #ifndef ASM_OUTPUT_SECTION_NAME
2295 if (flag_function_sections
)
2297 warning ("-ffunction-sections not supported for this target.");
2298 flag_function_sections
= 0;
2300 if (flag_data_sections
)
2302 warning ("-fdata-sections not supported for this target.");
2303 flag_data_sections
= 0;
2307 if (flag_function_sections
2308 && (profile_flag
|| profile_block_flag
))
2310 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2311 flag_function_sections
= 0;
2314 #ifndef OBJECT_FORMAT_ELF
2315 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2316 warning ("-ffunction-sections may affect debugging on some targets.");
2319 /* ??? Note: There used to be a conditional here
2320 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2321 This was to guarantee separation between gcc_compiled. and
2322 the first function, for the sake of dbx on Suns.
2323 However, having the extra zero here confused the Emacs
2324 code for unexec, and might confuse other programs too.
2325 Therefore, I took out that change.
2326 In future versions we should find another way to solve
2327 that dbx problem. -- rms, 23 May 93. */
2329 /* Don't let the first function fall at the same address
2330 as gcc_compiled., if profiling. */
2331 if (profile_flag
|| profile_block_flag
)
2333 /* It's best if we can write a nop here since some
2334 assemblers don't tolerate zeros in the text section. */
2335 output_asm_insn (get_insn_template (CODE_FOR_nop
, NULL
), NULL_PTR
);
2338 /* If dbx symbol table desired, initialize writing it
2339 and output the predefined types. */
2340 timevar_push (TV_SYMOUT
);
2341 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2342 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2343 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2345 #ifdef SDB_DEBUGGING_INFO
2346 if (write_symbols
== SDB_DEBUG
)
2347 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2349 #ifdef DWARF_DEBUGGING_INFO
2350 if (write_symbols
== DWARF_DEBUG
)
2351 dwarfout_init (asm_out_file
, main_input_filename
);
2353 #ifdef DWARF2_UNWIND_INFO
2354 if (dwarf2out_do_frame ())
2355 dwarf2out_frame_init ();
2357 #ifdef DWARF2_DEBUGGING_INFO
2358 if (write_symbols
== DWARF2_DEBUG
)
2359 dwarf2out_init (asm_out_file
, main_input_filename
);
2361 timevar_pop (TV_SYMOUT
);
2363 /* Initialize yet another pass. */
2365 init_final (main_input_filename
);
2366 init_branch_prob (dump_base_name
);
2368 timevar_push (TV_PARSE
);
2370 /* Call the parser, which parses the entire file
2371 (calling rest_of_compilation for each function). */
2373 if (yyparse () != 0)
2375 if (errorcount
== 0)
2376 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2378 /* In case there were missing closebraces,
2379 get us back to the global binding level. */
2380 while (! global_bindings_p ())
2384 /* Compilation is now finished except for writing
2385 what's left of the symbol table output. */
2387 timevar_pop (TV_PARSE
);
2389 if (flag_syntax_only
)
2392 globals
= getdecls ();
2394 /* Really define vars that have had only a tentative definition.
2395 Really output inline functions that must actually be callable
2396 and have not been output so far. */
2399 int len
= list_length (globals
);
2400 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2404 /* Process the decls in reverse order--earliest first.
2405 Put them into VEC from back to front, then take out from front. */
2407 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2408 vec
[len
- i
- 1] = decl
;
2410 wrapup_global_declarations (vec
, len
);
2412 /* This must occur after the loop to output deferred functions. Else
2413 the profiler initializer would not be emitted if all the functions
2414 in this compilation unit were deferred.
2416 output_func_start_profiler can not cause any additional functions or
2417 data to need to be output, so it need not be in the deferred function
2419 output_func_start_profiler ();
2421 /* Now that all possible functions have been output, we can dump
2422 the exception table. */
2424 #ifndef IA64_UNWIND_INFO
2425 output_exception_table ();
2427 free_exception_table ();
2429 check_global_declarations (vec
, len
);
2435 /* Write out any pending weak symbol declarations. */
2439 /* Do dbx symbols. */
2440 timevar_push (TV_SYMOUT
);
2441 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2442 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2443 dbxout_finish (asm_out_file
, main_input_filename
);
2446 #ifdef DWARF_DEBUGGING_INFO
2447 if (write_symbols
== DWARF_DEBUG
)
2451 #ifdef DWARF2_UNWIND_INFO
2452 if (dwarf2out_do_frame ())
2453 dwarf2out_frame_finish ();
2456 #ifdef DWARF2_DEBUGGING_INFO
2457 if (write_symbols
== DWARF2_DEBUG
)
2458 dwarf2out_finish ();
2460 timevar_pop (TV_SYMOUT
);
2462 /* Output some stuff at end of file if nec. */
2464 end_final (dump_base_name
);
2466 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2468 timevar_push (TV_DUMP
);
2469 open_dump_file (DFI_bp
, NULL
);
2473 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2474 timevar_pop (TV_DUMP
);
2478 ASM_FILE_END (asm_out_file
);
2481 /* Language-specific end of compilation actions. */
2485 /* Close the dump files. */
2487 if (flag_gen_aux_info
)
2489 fclose (aux_info_file
);
2491 unlink (aux_info_file_name
);
2494 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2496 timevar_push (TV_DUMP
);
2497 dump_combine_total_stats (rtl_dump_file
);
2498 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2499 timevar_pop (TV_DUMP
);
2502 /* Close non-debugging input and output files. Take special care to note
2503 whether fclose returns an error, since the pages might still be on the
2504 buffer chain while the file is open. */
2508 if (ferror (asm_out_file
) != 0 || fclose (asm_out_file
) != 0)
2509 fatal_io_error (asm_file_name
);
2511 /* Do whatever is necessary to finish printing the graphs. */
2512 if (graph_dump_format
!= no_graph
)
2516 for (i
= 0; i
< DFI_MAX
; ++i
)
2517 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2522 sprintf (seq
, ".%02d.", i
);
2523 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2524 finish_graph_dump_file (dump_base_name
, suffix
);
2531 ggc_print_statistics ();
2532 stringpool_statistics ();
2535 /* Free up memory for the benefit of leak detectors. */
2538 /* Stop timing total execution time. */
2539 timevar_stop (TV_TOTAL
);
2541 /* Print the times. */
2543 timevar_print (stderr
);
2546 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2547 and TYPE_DECL nodes.
2549 This does nothing for local (non-static) variables, unless the
2550 variable is a register variable with an ASMSPEC. In that case, or
2551 if the variable is not an automatice, it sets up the RTL and
2552 outputs any assembler code (label definition, storage allocation
2553 and initialization).
2555 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2556 the assembler symbol name to be used. TOP_LEVEL is nonzero
2557 if this declaration is not within a function. */
2560 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2562 const char *asmspec
;
2566 /* Declarations of variables, and of functions defined elsewhere. */
2568 /* The most obvious approach, to put an #ifndef around where
2569 this macro is used, doesn't work since it's inside a macro call. */
2570 #ifndef ASM_FINISH_DECLARE_OBJECT
2571 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2574 /* Forward declarations for nested functions are not "external",
2575 but we need to treat them as if they were. */
2576 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2577 || TREE_CODE (decl
) == FUNCTION_DECL
)
2579 timevar_push (TV_VARCONST
);
2580 make_decl_rtl (decl
, asmspec
, top_level
);
2581 /* Initialized extern variable exists to be replaced
2582 with its value, or represents something that will be
2583 output in another file. */
2584 if (! (TREE_CODE (decl
) == VAR_DECL
2585 && DECL_EXTERNAL (decl
) && TREE_READONLY (decl
)
2586 && DECL_INITIAL (decl
) != 0
2587 && DECL_INITIAL (decl
) != error_mark_node
))
2588 /* Don't output anything
2589 when a tentative file-scope definition is seen.
2590 But at end of compilation, do output code for them. */
2591 if (! (! at_end
&& top_level
2592 && (DECL_INITIAL (decl
) == 0
2593 || DECL_INITIAL (decl
) == error_mark_node
)))
2594 assemble_variable (decl
, top_level
, at_end
, 0);
2595 if (decl
== last_assemble_variable_decl
)
2597 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2600 timevar_pop (TV_VARCONST
);
2602 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2604 if (decode_reg_name (asmspec
) >= 0)
2606 DECL_RTL (decl
) = 0;
2607 make_decl_rtl (decl
, asmspec
, top_level
);
2611 error ("invalid register name `%s' for register variable", asmspec
);
2612 DECL_REGISTER (decl
) = 0;
2613 make_decl_rtl (decl
, NULL
, top_level
);
2616 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2617 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2618 && TREE_CODE (decl
) == TYPE_DECL
)
2620 timevar_push (TV_SYMOUT
);
2621 dbxout_symbol (decl
, 0);
2622 timevar_pop (TV_SYMOUT
);
2625 #ifdef SDB_DEBUGGING_INFO
2626 else if (write_symbols
== SDB_DEBUG
&& top_level
2627 && TREE_CODE (decl
) == TYPE_DECL
)
2629 timevar_push (TV_SYMOUT
);
2630 sdbout_symbol (decl
, 0);
2631 timevar_pop (TV_SYMOUT
);
2636 /* Called after finishing a record, union or enumeral type. */
2639 rest_of_type_compilation (type
, toplev
)
2640 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2644 tree type ATTRIBUTE_UNUSED
;
2645 int toplev ATTRIBUTE_UNUSED
;
2648 timevar_push (TV_SYMOUT
);
2649 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2650 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2651 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2653 #ifdef SDB_DEBUGGING_INFO
2654 if (write_symbols
== SDB_DEBUG
)
2655 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2657 #ifdef DWARF2_DEBUGGING_INFO
2658 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2659 dwarf2out_decl (TYPE_STUB_DECL (type
));
2661 timevar_pop (TV_SYMOUT
);
2664 /* DECL is an inline function, whose body is present, but which is not
2665 being output at this point. (We're putting that off until we need
2666 to do it.) If there are any actions that need to take place,
2667 including the emission of debugging information for the function,
2668 this is where they should go. This function may be called by
2669 language-dependent code for front-ends that do not even generate
2670 RTL for functions that don't need to be put out. */
2673 note_deferral_of_defined_inline_function (decl
)
2674 tree decl ATTRIBUTE_UNUSED
;
2676 #ifdef DWARF_DEBUGGING_INFO
2677 /* Generate the DWARF info for the "abstract" instance of a function
2678 which we may later generate inlined and/or out-of-line instances
2680 if (write_symbols
== DWARF_DEBUG
&& DECL_INLINE (decl
))
2682 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2683 DWARF code expects it to be set in this case. Intuitively,
2684 DECL is the function we just finished defining, so setting
2685 CURRENT_FUNCTION_DECL is sensible. */
2686 tree saved_cfd
= current_function_decl
;
2687 current_function_decl
= decl
;
2689 /* Let the DWARF code do its work. */
2690 set_decl_abstract_flags (decl
, 1);
2691 dwarfout_file_scope_decl (decl
, 0);
2692 set_decl_abstract_flags (decl
, 0);
2694 /* Reset CURRENT_FUNCTION_DECL. */
2695 current_function_decl
= saved_cfd
;
2700 /* This is called from finish_function (within yyparse)
2701 after each top-level definition is parsed.
2702 It is supposed to compile that function or variable
2703 and output the assembler code for it.
2704 After we return, the tree storage is freed. */
2707 rest_of_compilation (decl
)
2713 int rebuild_label_notes_after_reload
;
2714 int register_life_up_to_date
;
2716 timevar_push (TV_REST_OF_COMPILATION
);
2718 /* Now that we're out of the frontend, we shouldn't have any more
2719 CONCATs anywhere. */
2720 generating_concat_p
= 0;
2722 /* When processing delayed functions, prepare_function_start() won't
2723 have been run to re-initialize it. */
2724 cse_not_expected
= ! optimize
;
2726 /* First, make sure that NOTE_BLOCK is set correctly for each
2727 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2728 if (!cfun
->x_whole_function_mode_p
)
2731 /* Then remove any notes we don't need. That will make iterating
2732 over the instruction sequence faster, and allow the garbage
2733 collector to reclaim the memory used by the notes. */
2734 remove_unnecessary_notes ();
2736 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2737 tree in sensible shape. So, we just recalculate it here. */
2738 if (cfun
->x_whole_function_mode_p
)
2743 /* If we are reconsidering an inline function
2744 at the end of compilation, skip the stuff for making it inline. */
2746 if (DECL_SAVED_INSNS (decl
) == 0)
2752 /* If this is nested inside an inlined external function, pretend
2753 it was only declared. Since we cannot inline such functions,
2754 generating code for this one is not only not necessary but will
2755 confuse some debugging output writers. */
2756 for (parent
= DECL_CONTEXT (current_function_decl
);
2757 parent
!= NULL_TREE
;
2758 parent
= get_containing_scope (parent
))
2759 if (TREE_CODE (parent
) == FUNCTION_DECL
2760 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2762 DECL_INITIAL (decl
) = 0;
2763 goto exit_rest_of_compilation
;
2766 /* If requested, consider whether to make this function inline. */
2767 if (DECL_INLINE (decl
) || flag_inline_functions
)
2769 timevar_push (TV_INTEGRATION
);
2770 lose
= function_cannot_inline_p (decl
);
2771 timevar_pop (TV_INTEGRATION
);
2772 if (lose
|| ! optimize
)
2774 if (warn_inline
&& DECL_INLINE (decl
))
2775 warning_with_decl (decl
, lose
);
2776 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2777 /* Don't really compile an extern inline function.
2778 If we can't make it inline, pretend
2779 it was only declared. */
2780 if (DECL_EXTERNAL (decl
))
2782 DECL_INITIAL (decl
) = 0;
2783 goto exit_rest_of_compilation
;
2787 /* ??? Note that this has the effect of making it look
2788 like "inline" was specified for a function if we choose
2789 to inline it. This isn't quite right, but it's
2790 probably not worth the trouble to fix. */
2791 inlinable
= DECL_INLINE (decl
) = 1;
2794 insns
= get_insns ();
2796 /* Dump the rtl code if we are dumping rtl. */
2798 if (open_dump_file (DFI_rtl
, decl
))
2800 if (DECL_SAVED_INSNS (decl
))
2801 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2802 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2805 /* If function is inline, and we don't yet know whether to
2806 compile it by itself, defer decision till end of compilation.
2807 finish_compilation will call rest_of_compilation again
2808 for those functions that need to be output. Also defer those
2809 functions that we are supposed to defer. */
2812 || (DECL_INLINE (decl
)
2813 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2814 && ! flag_keep_inline_functions
)
2815 || DECL_EXTERNAL (decl
))))
2816 DECL_DEFER_OUTPUT (decl
) = 1;
2818 if (DECL_INLINE (decl
))
2819 /* DWARF wants seperate debugging info for abstract and
2820 concrete instances of all inline functions, including those
2821 declared inline but not inlined, and those inlined even
2822 though they weren't declared inline. Conveniently, that's
2823 what DECL_INLINE means at this point. */
2824 note_deferral_of_defined_inline_function (decl
);
2826 if (DECL_DEFER_OUTPUT (decl
))
2828 /* If -Wreturn-type, we have to do a bit of compilation. We just
2829 want to call jump_optimize to figure out whether or not we can
2830 fall off the end of the function; we do the minimum amount of
2831 work necessary to make that safe. And, we set optimize to zero
2832 to keep jump_optimize from working too hard. */
2833 if (warn_return_type
)
2835 int saved_optimize
= optimize
;
2838 find_exception_handler_labels ();
2839 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2840 !JUMP_AFTER_REGSCAN
);
2841 optimize
= saved_optimize
;
2844 current_function_nothrow
= nothrow_function_p ();
2845 if (current_function_nothrow
)
2846 /* Now we know that this can't throw; set the flag for the benefit
2847 of other functions later in this translation unit. */
2848 TREE_NOTHROW (current_function_decl
) = 1;
2850 timevar_push (TV_INTEGRATION
);
2851 save_for_inline (decl
);
2852 timevar_pop (TV_INTEGRATION
);
2853 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2854 goto exit_rest_of_compilation
;
2857 /* If specified extern inline but we aren't inlining it, we are
2858 done. This goes for anything that gets here with DECL_EXTERNAL
2859 set, not just things with DECL_INLINE. */
2860 if (DECL_EXTERNAL (decl
))
2861 goto exit_rest_of_compilation
;
2864 init_EXPR_INSN_LIST_cache ();
2868 /* Initialize some variables used by the optimizers. */
2869 init_function_for_compilation ();
2871 if (! DECL_DEFER_OUTPUT (decl
))
2872 TREE_ASM_WRITTEN (decl
) = 1;
2874 /* Now that integrate will no longer see our rtl, we need not
2875 distinguish between the return value of this function and the
2876 return value of called functions. Also, we can remove all SETs
2877 of subregs of hard registers; they are only here because of
2879 rtx_equal_function_value_matters
= 0;
2880 purge_hard_subreg_sets (get_insns ());
2882 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2883 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2884 goto exit_rest_of_compilation
;
2886 /* Emit code to get eh context, if needed. */
2889 /* We may have potential sibling or tail recursion sites. Select one
2890 (of possibly multiple) methods of performing the call. */
2891 if (flag_optimize_sibling_calls
)
2893 timevar_push (TV_JUMP
);
2894 open_dump_file (DFI_sibling
, decl
);
2896 optimize_sibling_and_tail_recursive_calls ();
2898 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2899 timevar_pop (TV_JUMP
);
2903 /* If we are doing position-independent code generation, now
2904 is the time to output special prologues and epilogues.
2905 We do not want to do this earlier, because it just clutters
2906 up inline functions with meaningless insns. */
2911 insns
= get_insns ();
2913 /* Copy any shared structure that should not be shared. */
2914 unshare_all_rtl (current_function_decl
, insns
);
2916 #ifdef SETJMP_VIA_SAVE_AREA
2917 /* This must be performed before virutal register instantiation. */
2918 if (current_function_calls_alloca
)
2919 optimize_save_area_alloca (insns
);
2922 /* Instantiate all virtual registers. */
2923 instantiate_virtual_regs (current_function_decl
, insns
);
2925 /* Find all the EH handlers. */
2926 find_exception_handler_labels ();
2928 open_dump_file (DFI_jump
, decl
);
2930 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2931 are initialized and to compute whether control can drop off the end
2934 timevar_push (TV_JUMP
);
2935 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2936 before jump optimization switches branch directions. */
2937 expected_value_to_br_prob ();
2939 reg_scan (insns
, max_reg_num (), 0);
2940 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2941 JUMP_AFTER_REGSCAN
);
2943 timevar_pop (TV_JUMP
);
2945 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2946 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2948 close_dump_file (DFI_jump
, print_rtl
, insns
);
2949 goto exit_rest_of_compilation
;
2952 timevar_push (TV_JUMP
);
2956 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2957 cleanup_cfg (insns
);
2959 /* ??? Run if-conversion before delete_null_pointer_checks,
2960 since the later does not preserve the CFG. This should
2961 be changed -- no since converting if's that are going to
2963 timevar_push (TV_IFCVT
);
2965 timevar_pop (TV_IFCVT
);
2967 /* Try to identify useless null pointer tests and delete them. */
2968 if (flag_delete_null_pointer_checks
)
2969 delete_null_pointer_checks (insns
);
2972 /* Jump optimization, and the removal of NULL pointer checks, may
2973 have reduced the number of instructions substantially. CSE, and
2974 future passes, allocate arrays whose dimensions involve the
2975 maximum instruction UID, so if we can reduce the maximum UID
2976 we'll save big on memory. */
2977 renumber_insns (rtl_dump_file
);
2978 timevar_pop (TV_JUMP
);
2980 close_dump_file (DFI_jump
, print_rtl
, insns
);
2984 /* Perform common subexpression elimination.
2985 Nonzero value from `cse_main' means that jumps were simplified
2986 and some code may now be unreachable, so do
2987 jump optimization again. */
2991 open_dump_file (DFI_cse
, decl
);
2992 timevar_push (TV_CSE
);
2994 reg_scan (insns
, max_reg_num (), 1);
2996 if (flag_thread_jumps
)
2998 timevar_push (TV_JUMP
);
2999 thread_jumps (insns
, max_reg_num (), 1);
3000 timevar_pop (TV_JUMP
);
3003 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3005 /* If we are not running the second CSE pass, then we are no longer
3006 expecting CSE to be run. */
3007 cse_not_expected
= !flag_rerun_cse_after_loop
;
3009 if (tem
|| optimize
> 1)
3011 timevar_push (TV_JUMP
);
3012 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3013 !JUMP_AFTER_REGSCAN
);
3014 timevar_pop (TV_JUMP
);
3017 /* Run this after jump optmizations remove all the unreachable code
3018 so that unreachable code will not keep values live. */
3019 delete_trivially_dead_insns (insns
, max_reg_num ());
3021 /* Try to identify useless null pointer tests and delete them. */
3022 if (flag_delete_null_pointer_checks
)
3024 timevar_push (TV_JUMP
);
3025 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3027 cleanup_cfg (insns
);
3029 delete_null_pointer_checks (insns
);
3030 timevar_pop (TV_JUMP
);
3033 /* The second pass of jump optimization is likely to have
3034 removed a bunch more instructions. */
3035 renumber_insns (rtl_dump_file
);
3037 timevar_pop (TV_CSE
);
3038 close_dump_file (DFI_cse
, print_rtl
, insns
);
3041 open_dump_file (DFI_addressof
, decl
);
3043 purge_addressof (insns
);
3044 reg_scan (insns
, max_reg_num (), 1);
3046 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3050 if (optimize
> 0 && flag_ssa
)
3052 /* Convert to SSA form. */
3054 timevar_push (TV_TO_SSA
);
3055 open_dump_file (DFI_ssa
, decl
);
3057 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3058 cleanup_cfg (insns
);
3061 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3062 timevar_pop (TV_TO_SSA
);
3064 /* The SSA implementation uses basic block numbers in its phi
3065 nodes. Thus, changing the control-flow graph or the basic
3066 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3067 may cause problems. */
3071 /* Remove dead code. */
3073 timevar_push (TV_DEAD_CODE_ELIM
);
3074 open_dump_file (DFI_dce
, decl
);
3076 insns
= get_insns ();
3077 eliminate_dead_code();
3079 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3080 timevar_pop (TV_DEAD_CODE_ELIM
);
3083 /* Convert from SSA form. */
3085 timevar_push (TV_FROM_SSA
);
3086 open_dump_file (DFI_ussa
, decl
);
3088 convert_from_ssa ();
3089 /* New registers have been created. Rescan their usage. */
3090 reg_scan (insns
, max_reg_num (), 1);
3091 /* Life analysis used in SSA adds log_links but these
3092 shouldn't be there until the flow stage, so clear
3094 clear_log_links (insns
);
3096 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3097 timevar_pop (TV_FROM_SSA
);
3102 /* Perform global cse. */
3104 if (optimize
> 0 && flag_gcse
)
3106 timevar_push (TV_GCSE
);
3107 open_dump_file (DFI_gcse
, decl
);
3109 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3110 cleanup_cfg (insns
);
3111 tem
= gcse_main (insns
, rtl_dump_file
);
3113 /* If gcse altered any jumps, rerun jump optimizations to clean
3117 timevar_push (TV_JUMP
);
3118 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3119 !JUMP_AFTER_REGSCAN
);
3120 timevar_pop (TV_JUMP
);
3123 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3124 timevar_pop (TV_GCSE
);
3129 /* Move constant computations out of loops. */
3133 timevar_push (TV_LOOP
);
3134 open_dump_file (DFI_loop
, decl
);
3136 if (flag_rerun_loop_opt
)
3138 /* We only want to perform unrolling once. */
3140 loop_optimize (insns
, rtl_dump_file
, 0);
3142 /* The first call to loop_optimize makes some instructions
3143 trivially dead. We delete those instructions now in the
3144 hope that doing so will make the heuristics in loop work
3145 better and possibly speed up compilation. */
3146 delete_trivially_dead_insns (insns
, max_reg_num ());
3148 /* The regscan pass is currently necessary as the alias
3149 analysis code depends on this information. */
3150 reg_scan (insns
, max_reg_num (), 1);
3152 loop_optimize (insns
, rtl_dump_file
,
3153 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3155 close_dump_file (DFI_loop
, print_rtl
, insns
);
3156 timevar_pop (TV_LOOP
);
3163 timevar_push (TV_CSE2
);
3164 open_dump_file (DFI_cse2
, decl
);
3166 if (flag_rerun_cse_after_loop
)
3168 /* Running another jump optimization pass before the second
3169 cse pass sometimes simplifies the RTL enough to allow
3170 the second CSE pass to do a better job. Jump_optimize can change
3171 max_reg_num so we must rerun reg_scan afterwards.
3172 ??? Rework to not call reg_scan so often. */
3173 timevar_push (TV_JUMP
);
3175 reg_scan (insns
, max_reg_num (), 0);
3176 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3177 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3179 timevar_push (TV_IFCVT
);
3181 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3182 cleanup_cfg (insns
);
3185 timevar_pop(TV_IFCVT
);
3187 timevar_pop (TV_JUMP
);
3189 reg_scan (insns
, max_reg_num (), 0);
3190 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3194 timevar_push (TV_JUMP
);
3195 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3196 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3197 timevar_pop (TV_JUMP
);
3201 if (flag_thread_jumps
)
3203 /* This pass of jump threading straightens out code
3204 that was kinked by loop optimization. */
3205 timevar_push (TV_JUMP
);
3206 reg_scan (insns
, max_reg_num (), 0);
3207 thread_jumps (insns
, max_reg_num (), 0);
3208 timevar_pop (TV_JUMP
);
3211 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3212 timevar_pop (TV_CSE2
);
3217 cse_not_expected
= 1;
3221 /* Do control and data flow analysis; wrote some of the results to
3224 timevar_push (TV_FLOW
);
3225 open_dump_file (DFI_cfg
, decl
);
3227 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3228 cleanup_cfg (insns
);
3229 check_function_return_warnings ();
3231 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3233 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3235 timevar_push (TV_BRANCH_PROB
);
3236 open_dump_file (DFI_bp
, decl
);
3240 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3241 timevar_pop (TV_BRANCH_PROB
);
3244 open_dump_file (DFI_life
, decl
);
3249 /* Discover and record the loop depth at the head of each basic
3250 block. The loop infrastructure does the real job for us. */
3251 flow_loops_find (&loops
, LOOP_TREE
);
3253 /* Estimate using heuristics if no profiling info is available. */
3254 estimate_probability (&loops
);
3257 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3259 flow_loops_free (&loops
);
3261 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3262 mark_constant_function ();
3263 timevar_pop (TV_FLOW
);
3265 register_life_up_to_date
= 1;
3268 if (warn_uninitialized
|| extra_warnings
)
3270 uninitialized_vars_warning (DECL_INITIAL (decl
));
3272 setjmp_args_warning ();
3275 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3279 /* If -opt, try combining insns through substitution. */
3283 int rebuild_jump_labels_after_combine
= 0;
3285 timevar_push (TV_COMBINE
);
3286 open_dump_file (DFI_combine
, decl
);
3288 rebuild_jump_labels_after_combine
3289 = combine_instructions (insns
, max_reg_num ());
3291 /* Combining insns may have turned an indirect jump into a
3292 direct jump. Rebuid the JUMP_LABEL fields of jumping
3294 if (rebuild_jump_labels_after_combine
)
3296 timevar_push (TV_JUMP
);
3297 rebuild_jump_labels (insns
);
3298 timevar_pop (TV_JUMP
);
3300 timevar_push (TV_FLOW
);
3301 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3302 cleanup_cfg (insns
);
3304 /* Blimey. We've got to have the CFG up to date for the call to
3305 if_convert below. However, the random deletion of blocks
3306 without updating life info can wind up with Wierd Stuff in
3307 global_live_at_end. We then run sched1, which updates things
3308 properly, discovers the wierdness and aborts. */
3309 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3310 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3311 | PROP_SCAN_DEAD_CODE
);
3313 timevar_pop (TV_FLOW
);
3316 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3317 timevar_pop (TV_COMBINE
);
3322 /* Rerun if-conversion, as combine may have simplified things enough to
3323 now meet sequence length restrictions. */
3326 timevar_push (TV_IFCVT
);
3327 open_dump_file (DFI_ce
, decl
);
3333 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3334 timevar_pop (TV_IFCVT
);
3337 /* Register allocation pre-pass, to reduce number of moves
3338 necessary for two-address machines. */
3339 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3341 timevar_push (TV_REGMOVE
);
3342 open_dump_file (DFI_regmove
, decl
);
3344 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3346 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3347 timevar_pop (TV_REGMOVE
);
3352 /* Any of the several passes since flow1 will have munged register
3353 lifetime data a bit. */
3355 register_life_up_to_date
= 0;
3357 #ifdef OPTIMIZE_MODE_SWITCHING
3358 timevar_push (TV_GCSE
);
3360 if (optimize_mode_switching (NULL_PTR
))
3362 /* We did work, and so had to regenerate global life information.
3363 Take advantage of this and don't re-recompute register life
3364 information below. */
3365 register_life_up_to_date
= 1;
3368 timevar_pop (TV_GCSE
);
3371 #ifdef INSN_SCHEDULING
3373 /* Print function header into sched dump now
3374 because doing the sched analysis makes some of the dump. */
3375 if (optimize
> 0 && flag_schedule_insns
)
3377 timevar_push (TV_SCHED
);
3378 open_dump_file (DFI_sched
, decl
);
3380 /* Do control and data sched analysis,
3381 and write some of the results to dump file. */
3383 schedule_insns (rtl_dump_file
);
3385 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3386 timevar_pop (TV_SCHED
);
3390 /* Register lifetime information was updated as part of verifying
3392 register_life_up_to_date
= 1;
3396 /* Determine if the current function is a leaf before running reload
3397 since this can impact optimizations done by the prologue and
3398 epilogue thus changing register elimination offsets. */
3399 current_function_is_leaf
= leaf_function_p ();
3401 timevar_push (TV_LOCAL_ALLOC
);
3402 open_dump_file (DFI_lreg
, decl
);
3404 /* Allocate pseudo-regs that are used only within 1 basic block.
3406 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3407 jump optimizer after register allocation and reloading are finished. */
3409 if (! register_life_up_to_date
)
3410 recompute_reg_usage (insns
, ! optimize_size
);
3411 regclass (insns
, max_reg_num (), rtl_dump_file
);
3412 rebuild_label_notes_after_reload
= local_alloc ();
3414 timevar_pop (TV_LOCAL_ALLOC
);
3416 if (dump_file
[DFI_lreg
].enabled
)
3418 timevar_push (TV_DUMP
);
3420 dump_flow_info (rtl_dump_file
);
3421 dump_local_alloc (rtl_dump_file
);
3423 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3424 timevar_pop (TV_DUMP
);
3429 timevar_push (TV_GLOBAL_ALLOC
);
3430 open_dump_file (DFI_greg
, decl
);
3432 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3433 pass fixing up any insns that are invalid. */
3436 failure
= global_alloc (rtl_dump_file
);
3439 build_insn_chain (insns
);
3440 failure
= reload (insns
, 0);
3443 timevar_pop (TV_GLOBAL_ALLOC
);
3445 if (dump_file
[DFI_greg
].enabled
)
3447 timevar_push (TV_DUMP
);
3449 dump_global_regs (rtl_dump_file
);
3451 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3452 timevar_pop (TV_DUMP
);
3456 goto exit_rest_of_compilation
;
3460 open_dump_file (DFI_postreload
, decl
);
3462 /* Do a very simple CSE pass over just the hard registers. */
3465 timevar_push (TV_RELOAD_CSE_REGS
);
3466 reload_cse_regs (insns
);
3467 timevar_pop (TV_RELOAD_CSE_REGS
);
3470 /* If optimizing, then go ahead and split insns now since we are about
3471 to recompute flow information anyway. */
3474 int old_labelnum
= max_label_num ();
3476 split_all_insns (0);
3477 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3480 /* Register allocation and reloading may have turned an indirect jump into
3481 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3482 jumping instructions. */
3483 if (rebuild_label_notes_after_reload
)
3485 timevar_push (TV_JUMP
);
3487 rebuild_jump_labels (insns
);
3489 timevar_pop (TV_JUMP
);
3492 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3494 /* Re-create the death notes which were deleted during reload. */
3495 timevar_push (TV_FLOW2
);
3496 open_dump_file (DFI_flow2
, decl
);
3498 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3499 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3500 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3502 /* On some machines, the prologue and epilogue code, or parts thereof,
3503 can be represented as RTL. Doing so lets us schedule insns between
3504 it and the rest of the code and also allows delayed branch
3505 scheduling to operate in the epilogue. */
3506 thread_prologue_and_epilogue_insns (insns
);
3510 cleanup_cfg (insns
);
3511 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3513 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3514 even for machines with possibly nonzero RETURN_POPS_ARGS
3515 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3516 push instructions will have popping returns. */
3517 #ifndef PUSH_ROUNDING
3518 if (!ACCUMULATE_OUTGOING_ARGS
)
3520 combine_stack_adjustments ();
3525 flow2_completed
= 1;
3527 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3528 timevar_pop (TV_FLOW2
);
3530 #ifdef HAVE_peephole2
3531 if (optimize
> 0 && flag_peephole2
)
3533 timevar_push (TV_PEEPHOLE2
);
3534 open_dump_file (DFI_peephole2
, decl
);
3536 peephole2_optimize (rtl_dump_file
);
3538 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3539 timevar_pop (TV_PEEPHOLE2
);
3543 if (optimize
> 0 && flag_rename_registers
)
3545 timevar_push (TV_RENAME_REGISTERS
);
3546 open_dump_file (DFI_rnreg
, decl
);
3548 regrename_optimize ();
3550 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3551 timevar_pop (TV_RENAME_REGISTERS
);
3556 timevar_push (TV_IFCVT2
);
3557 open_dump_file (DFI_ce2
, decl
);
3561 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3562 timevar_pop (TV_IFCVT2
);
3565 #ifdef INSN_SCHEDULING
3566 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3568 timevar_push (TV_SCHED2
);
3569 open_dump_file (DFI_sched2
, decl
);
3571 /* Do control and data sched analysis again,
3572 and write some more of the results to dump file. */
3574 schedule_insns (rtl_dump_file
);
3576 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3577 timevar_pop (TV_SCHED2
);
3583 #ifdef LEAF_REGISTERS
3584 current_function_uses_only_leaf_regs
3585 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3588 if (optimize
> 0 && flag_reorder_blocks
)
3590 timevar_push (TV_REORDER_BLOCKS
);
3591 open_dump_file (DFI_bbro
, decl
);
3593 reorder_basic_blocks ();
3595 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3596 timevar_pop (TV_REORDER_BLOCKS
);
3599 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3600 Also do cross-jumping this time and delete no-op move insns. */
3604 timevar_push (TV_JUMP
);
3605 open_dump_file (DFI_jump2
, decl
);
3607 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3608 !JUMP_AFTER_REGSCAN
);
3610 /* CFG no longer kept up to date. */
3612 close_dump_file (DFI_jump2
, print_rtl_with_bb
, insns
);
3613 timevar_pop (TV_JUMP
);
3616 /* If a machine dependent reorganization is needed, call it. */
3617 #ifdef MACHINE_DEPENDENT_REORG
3618 open_dump_file (DFI_mach
, decl
);
3620 MACHINE_DEPENDENT_REORG (insns
);
3622 close_dump_file (DFI_mach
, print_rtl_with_bb
, insns
);
3627 /* If a scheduling pass for delayed branches is to be done,
3628 call the scheduling code. */
3631 if (optimize
> 0 && flag_delayed_branch
)
3633 timevar_push (TV_DBR_SCHED
);
3634 open_dump_file (DFI_dbr
, decl
);
3636 dbr_schedule (insns
, rtl_dump_file
);
3638 close_dump_file (DFI_dbr
, print_rtl_with_bb
, insns
);
3639 timevar_pop (TV_DBR_SCHED
);
3645 /* Shorten branches.
3647 Note this must run before reg-stack because of death note (ab)use
3648 in the ia32 backend. */
3649 timevar_push (TV_SHORTEN_BRANCH
);
3650 shorten_branches (get_insns ());
3651 timevar_pop (TV_SHORTEN_BRANCH
);
3654 timevar_push (TV_REG_STACK
);
3655 open_dump_file (DFI_stack
, decl
);
3657 reg_to_stack (insns
, rtl_dump_file
);
3659 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3660 timevar_pop (TV_REG_STACK
);
3665 current_function_nothrow
= nothrow_function_p ();
3666 if (current_function_nothrow
)
3667 /* Now we know that this can't throw; set the flag for the benefit
3668 of other functions later in this translation unit. */
3669 TREE_NOTHROW (current_function_decl
) = 1;
3671 /* Now turn the rtl into assembler code. */
3673 timevar_push (TV_FINAL
);
3678 /* Get the function's name, as described by its RTL. This may be
3679 different from the DECL_NAME name used in the source file. */
3681 x
= DECL_RTL (decl
);
3682 if (GET_CODE (x
) != MEM
)
3685 if (GET_CODE (x
) != SYMBOL_REF
)
3687 fnname
= XSTR (x
, 0);
3689 assemble_start_function (decl
, fnname
);
3690 final_start_function (insns
, asm_out_file
, optimize
);
3691 final (insns
, asm_out_file
, optimize
, 0);
3692 final_end_function (insns
, asm_out_file
, optimize
);
3693 assemble_end_function (decl
, fnname
);
3695 fflush (asm_out_file
);
3697 /* Release all memory allocated by flow. */
3698 free_basic_block_vars (0);
3700 /* Release all memory held by regsets now. */
3701 regset_release_memory ();
3703 timevar_pop (TV_FINAL
);
3707 /* Write DBX symbols if requested. */
3709 /* Note that for those inline functions where we don't initially
3710 know for certain that we will be generating an out-of-line copy,
3711 the first invocation of this routine (rest_of_compilation) will
3712 skip over this code by doing a `goto exit_rest_of_compilation;'.
3713 Later on, finish_compilation will call rest_of_compilation again
3714 for those inline functions that need to have out-of-line copies
3715 generated. During that call, we *will* be routed past here. */
3717 timevar_push (TV_SYMOUT
);
3718 #ifdef DBX_DEBUGGING_INFO
3719 if (write_symbols
== DBX_DEBUG
)
3720 dbxout_function (decl
);
3723 #ifdef DWARF_DEBUGGING_INFO
3724 if (write_symbols
== DWARF_DEBUG
)
3725 dwarfout_file_scope_decl (decl
, 0);
3728 #ifdef DWARF2_DEBUGGING_INFO
3729 if (write_symbols
== DWARF2_DEBUG
)
3730 dwarf2out_decl (decl
);
3732 timevar_pop (TV_SYMOUT
);
3734 exit_rest_of_compilation
:
3736 /* In case the function was not output,
3737 don't leave any temporary anonymous types
3738 queued up for sdb output. */
3739 #ifdef SDB_DEBUGGING_INFO
3740 if (write_symbols
== SDB_DEBUG
)
3741 sdbout_types (NULL_TREE
);
3744 reload_completed
= 0;
3745 flow2_completed
= 0;
3748 timevar_push (TV_FINAL
);
3750 /* Clear out the insn_length contents now that they are no
3752 init_insn_lengths ();
3754 /* Clear out the real_constant_chain before some of the rtx's
3755 it runs through become garbage. */
3756 clear_const_double_mem ();
3758 /* Show no temporary slots allocated. */
3761 free_basic_block_vars (0);
3763 timevar_pop (TV_FINAL
);
3765 /* Make sure volatile mem refs aren't considered valid operands for
3766 arithmetic insns. We must call this here if this is a nested inline
3767 function, since the above code leaves us in the init_recog state
3768 (from final.c), and the function context push/pop code does not
3769 save/restore volatile_ok.
3771 ??? Maybe it isn't necessary for expand_start_function to call this
3772 anymore if we do it here? */
3774 init_recog_no_volatile ();
3776 /* We're done with this function. Free up memory if we can. */
3777 free_after_parsing (cfun
);
3778 if (! DECL_DEFER_OUTPUT (decl
))
3779 free_after_compilation (cfun
);
3784 timevar_pop (TV_REST_OF_COMPILATION
);
3794 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3795 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3796 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3797 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3798 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3799 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"));
3801 for (i
= ARRAY_SIZE (f_options
); i
--;)
3803 const char *description
= f_options
[i
].description
;
3805 if (description
!= NULL
&& * description
!= 0)
3806 printf (" -f%-21s %s\n",
3807 f_options
[i
].string
, description
);
3810 printf (_(" -O[number] Set optimisation level to [number]\n"));
3811 printf (_(" -Os Optimise for space rather than speed\n"));
3812 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3813 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3814 printf (_(" -w Suppress warnings\n"));
3815 printf (_(" -W Enable extra warnings\n"));
3817 for (i
= ARRAY_SIZE (W_options
); i
--;)
3819 const char *description
= W_options
[i
].description
;
3821 if (description
!= NULL
&& * description
!= 0)
3822 printf (" -W%-21s %s\n",
3823 W_options
[i
].string
, description
);
3826 printf (_(" -Wunused Enable unused warnings\n"));
3827 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3828 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3829 printf (_(" -p Enable function profiling\n"));
3830 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3831 printf (_(" -a Enable block profiling \n"));
3833 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3834 printf (_(" -ax Enable jump profiling \n"));
3836 printf (_(" -o <file> Place output into <file> \n"));
3838 -G <number> Put global and static data smaller than <number>\n\
3839 bytes into a special section (on some targets)\n"));
3841 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3843 if (debug_args
[i
].description
!= NULL
)
3844 printf (" -g%-21s %s\n",
3845 debug_args
[i
].arg
, debug_args
[i
].description
);
3848 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3849 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3850 printf (_(" -version Display the compiler's version\n"));
3851 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3852 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3853 #if defined INSN_SCHEDULING
3854 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3856 printf (_(" --help Display this information\n"));
3861 /* Display descriptions of language specific options.
3862 If there is no description, note that there is an undocumented option.
3863 If the description is empty, do not display anything. (This allows
3864 options to be deliberately undocumented, for whatever reason).
3865 If the option string is missing, then this is a marker, indicating
3866 that the description string is in fact the name of a language, whose
3867 language specific options are to follow. */
3869 if (ARRAY_SIZE (documented_lang_options
) > 1)
3871 printf (_("\nLanguage specific options:\n"));
3873 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3875 const char *description
= documented_lang_options
[i
].description
;
3876 const char *option
= documented_lang_options
[i
].option
;
3878 if (description
== NULL
)
3883 printf (_(" %-23.23s [undocumented]\n"), option
);
3885 else if (*description
== 0)
3887 else if (option
== NULL
)
3891 (_("\nThere are undocumented %s specific options as well.\n"),
3895 printf (_("\n Options for %s:\n"), description
);
3900 printf (" %-23.23s %s\n", option
, description
);
3905 printf (_("\nThere are undocumented %s specific options as well.\n"),
3908 display_target_options ();
3912 display_target_options ()
3916 if (ARRAY_SIZE (target_switches
) > 1
3917 #ifdef TARGET_OPTIONS
3918 || ARRAY_SIZE (target_options
) > 1
3926 printf (_("\nTarget specific options:\n"));
3928 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3930 const char *option
= target_switches
[i
].name
;
3931 const char *description
= target_switches
[i
].description
;
3933 if (option
== NULL
|| *option
== 0)
3935 else if (description
== NULL
)
3940 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3942 else if (* description
!= 0)
3943 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3946 #ifdef TARGET_OPTIONS
3947 for (i
= ARRAY_SIZE (target_options
); i
--;)
3949 const char *option
= target_options
[i
].prefix
;
3950 const char *description
= target_options
[i
].description
;
3952 if (option
== NULL
|| *option
== 0)
3954 else if (description
== NULL
)
3959 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3961 else if (* description
!= 0)
3962 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3968 printf (_("\nThere are undocumented target specific options as well.\n"));
3970 printf (_(" They exist, but they are not documented.\n"));
3975 /* Parse a -d... comand line switch. */
3978 decode_d_option (arg
)
3987 for (i
= 0; i
< DFI_MAX
; ++i
)
3988 dump_file
[i
].enabled
= 1;
3997 flag_print_asm_name
= 1;
4000 flag_dump_rtl_in_asm
= 1;
4001 flag_print_asm_name
= 1;
4004 graph_dump_format
= vcg
;
4007 rtl_dump_and_exit
= 1;
4012 case 'D': /* These are handled by the preprocessor. */
4018 for (i
= 0; i
< DFI_MAX
; ++i
)
4019 if (c
== dump_file
[i
].debug_switch
)
4021 dump_file
[i
].enabled
= 1;
4026 warning ("unrecognized gcc debugging option: %c", c
);
4031 /* Parse a -f... comand line switch. ARG is the value after the -f.
4032 It is safe to access 'ARG - 2' to generate the full switch name.
4033 Return the number of strings consumed. */
4036 decode_f_option (arg
)
4040 const char *option_value
= NULL
;
4042 /* Search for the option in the table of binary f options. */
4043 for (j
= ARRAY_SIZE (f_options
); j
--;)
4045 if (!strcmp (arg
, f_options
[j
].string
))
4047 *f_options
[j
].variable
= f_options
[j
].on_value
;
4051 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4052 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4054 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4059 if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4060 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4062 read_integral_parameter (option_value
, arg
- 2, inline_max_insns
);
4063 #ifdef INSN_SCHEDULING
4064 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4065 fix_sched_param ("verbose", option_value
);
4067 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4068 fix_register (option_value
, 1, 1);
4069 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4070 fix_register (option_value
, 0, 1);
4071 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4072 fix_register (option_value
, 0, 0);
4073 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4074 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4075 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4077 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4078 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4079 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4080 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4082 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4083 else if ((option_value
4084 = skip_leading_substring (arg
, "stack-limit-register=")))
4086 int reg
= decode_reg_name (option_value
);
4088 error ("unrecognized register name `%s'", option_value
);
4090 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4092 else if ((option_value
4093 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4096 nm
= ggc_strdup (option_value
);
4097 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4099 else if ((option_value
4100 = skip_leading_substring (arg
, "message-length=")))
4101 diagnostic_message_length_per_line
=
4102 read_integral_parameter (option_value
, arg
- 2,
4103 diagnostic_message_length_per_line
);
4104 else if ((option_value
4105 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4107 if (!strcmp (option_value
, "once"))
4108 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4109 else if (!strcmp (option_value
, "every-line"))
4110 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4112 error ("Unrecognized option `%s'", arg
- 2);
4114 else if (!strcmp (arg
, "no-stack-limit"))
4115 stack_limit_rtx
= NULL_RTX
;
4116 else if (!strcmp (arg
, "preprocessed"))
4117 /* Recognise this switch but do nothing. This prevents warnings
4118 about an unrecognized switch if cpplib has not been linked in. */
4126 /* Parse a -W... comand line switch. ARG is the value after the -W.
4127 It is safe to access 'ARG - 2' to generate the full switch name.
4128 Return the number of strings consumed. */
4131 decode_W_option (arg
)
4134 const char *option_value
= NULL
;
4137 /* Search for the option in the table of binary W options. */
4139 for (j
= ARRAY_SIZE (W_options
); j
--;)
4141 if (!strcmp (arg
, W_options
[j
].string
))
4143 *W_options
[j
].variable
= W_options
[j
].on_value
;
4147 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4148 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4150 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4155 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4157 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4159 if (id_clash_len
!= -1)
4162 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4164 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4166 if (larger_than_size
!= -1)
4167 warn_larger_than
= 1;
4169 else if (!strcmp (arg
, "unused"))
4173 else if (!strcmp (arg
, "no-unused"))
4183 /* Parse a -g... comand line switch. ARG is the value after the -g.
4184 It is safe to access 'ARG - 2' to generate the full switch name.
4185 Return the number of strings consumed. */
4188 decode_g_option (arg
)
4192 /* A lot of code assumes write_symbols == NO_DEBUG if the
4193 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4194 of what debugging type has been selected). This records the
4195 selected type. It is an error to specify more than one
4197 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4198 /* Non-zero if debugging format has been explicitly set.
4199 -g and -ggdb don't explicitly set the debugging format so
4200 -gdwarf -g3 is equivalent to -gdwarf3. */
4201 static int type_explicitly_set_p
= 0;
4202 /* Indexed by enum debug_info_type. */
4203 static const char *debug_type_names
[] =
4205 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4208 /* The maximum admissible debug level value. */
4209 static const unsigned max_debug_level
= 3;
4211 /* Look up ARG in the table. */
4212 for (da
= debug_args
; da
->arg
; da
++)
4214 const int da_len
= strlen (da
->arg
);
4216 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4218 enum debug_info_type type
= da
->debug_type
;
4219 const char *p
= arg
+ da_len
;
4221 if (*p
&& (*p
< '0' || *p
> '9'))
4224 /* A debug flag without a level defaults to level 2.
4225 Note we do not want to call read_integral_parameter
4226 for that case since it will call atoi which
4229 ??? We may want to generalize the interface to
4230 read_integral_parameter to better handle this case
4231 if this case shows up often. */
4233 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4237 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4239 error ("use -gdwarf -g%d for DWARF v1, level %d",
4242 error ("use -gdwarf-2 for DWARF v2");
4245 if (level
> max_debug_level
)
4248 ignoring option `%s' due to invalid debug level specification",
4250 level
= debug_info_level
;
4253 if (type
== NO_DEBUG
)
4255 type
= PREFERRED_DEBUGGING_TYPE
;
4257 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4259 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4260 type
= DWARF2_DEBUG
;
4262 #ifdef DBX_DEBUGGING_INFO
4269 if (type
== NO_DEBUG
)
4270 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4272 /* Does it conflict with an already selected type? */
4273 if (type_explicitly_set_p
4274 /* -g/-ggdb don't conflict with anything. */
4275 && da
->debug_type
!= NO_DEBUG
4276 && type
!= selected_debug_type
)
4277 warning ("`%s' ignored, conflicts with `-g%s'",
4278 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4281 /* If the format has already been set, -g/-ggdb
4282 only change the debug level. */
4283 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4284 /* Don't change debugging type. */
4288 selected_debug_type
= type
;
4289 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4292 write_symbols
= (level
== 0
4294 : selected_debug_type
);
4295 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4296 debug_info_level
= (enum debug_info_level
) level
;
4309 /* Decode the first argument in the argv as a language-independent option.
4310 Return the number of strings consumed. */
4313 independent_decode_option (argc
, argv
)
4317 char *arg
= argv
[0];
4319 if (arg
[0] != '-' || arg
[1] == 0)
4331 if (!strcmp (arg
, "-help"))
4337 if (!strcmp (arg
, "-target-help"))
4339 display_target_options ();
4352 /* Already been treated in main (). Do nothing. */
4356 set_target_switch (arg
+ 1);
4360 return decode_f_option (arg
+ 1);
4363 return decode_g_option (arg
+ 1);
4366 if (!strcmp (arg
, "dumpbase"))
4371 dump_base_name
= argv
[1];
4375 decode_d_option (arg
+ 1);
4379 if (!strcmp (arg
, "pedantic"))
4381 else if (!strcmp (arg
, "pedantic-errors"))
4382 flag_pedantic_errors
= pedantic
= 1;
4383 else if (arg
[1] == 0)
4390 if (!strcmp (arg
, "quiet"))
4397 if (!strcmp (arg
, "version"))
4405 inhibit_warnings
= 1;
4414 /* We save the value of warn_uninitialized, since if they put
4415 -Wuninitialized on the command line, we need to generate a
4416 warning about not using it without also specifying -O. */
4417 if (warn_uninitialized
!= 1)
4418 warn_uninitialized
= 2;
4421 return decode_W_option (arg
+ 1);
4427 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4428 warning ("`-a' option (basic block profile) not supported");
4430 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4433 else if (!strcmp (arg
, "ax"))
4435 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4436 warning ("`-ax' option (jump profiling) not supported");
4438 profile_block_flag
= (!profile_block_flag
4439 || profile_block_flag
== 2) ? 2 : 3;
4442 else if (!strncmp (arg
, "aux-info", 8))
4444 flag_gen_aux_info
= 1;
4450 aux_info_file_name
= argv
[1];
4454 aux_info_file_name
= arg
+ 8;
4466 asm_file_name
= argv
[1];
4481 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4486 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4490 if (g_switch_val
== -1)
4494 g_switch_set
= TRUE
;
4495 g_switch_value
= g_switch_val
;
4505 /* Entry point of cc1/c++. Decode command args, then call compile_file.
4506 Exit code is 35 if can't open files, 34 if fatal error,
4507 33 if had nonfatal errors, else success. */
4509 extern int main
PARAMS ((int, char **));
4519 /* save in case md file wants to emit args as a comment. */
4523 p
= argv
[0] + strlen (argv
[0]);
4524 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4528 xmalloc_set_program_name (progname
);
4530 /* LC_CTYPE determines the character set used by the terminal so it has be set
4531 to output messages correctly. */
4533 #ifdef HAVE_LC_MESSAGES
4534 setlocale (LC_CTYPE
, "");
4535 setlocale (LC_MESSAGES
, "");
4537 setlocale (LC_ALL
, "");
4540 (void) bindtextdomain (PACKAGE
, localedir
);
4541 (void) textdomain (PACKAGE
);
4543 /* Install handler for SIGFPE, which may be received while we do
4544 compile-time floating point arithmetic. */
4545 signal (SIGFPE
, float_signal
);
4547 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4549 signal (SIGSEGV
, crash_signal
);
4552 signal (SIGILL
, crash_signal
);
4555 signal (SIGBUS
, crash_signal
);
4558 signal (SIGABRT
, crash_signal
);
4560 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4561 signal (SIGIOT
, crash_signal
);
4564 decl_printable_name
= decl_name
;
4565 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4567 /* Initialize whether `char' is signed. */
4568 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4569 #ifdef DEFAULT_SHORT_ENUMS
4570 /* Initialize how much space enums occupy, by default. */
4571 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4574 /* Initialize the garbage-collector. */
4577 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4578 ggc_add_tree_root (¤t_function_decl
, 1);
4579 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4581 /* Initialize the diagnostics reporting machinery. */
4582 initialize_diagnostics ();
4584 /* Perform language-specific options intialization. */
4585 lang_init_options ();
4587 /* Scan to see what optimization level has been specified. That will
4588 determine the default value of many flags. */
4589 for (i
= 1; i
< argc
; i
++)
4591 if (!strcmp (argv
[i
], "-O"))
4596 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4598 /* Handle -Os, -O2, -O3, -O69, ... */
4599 char *p
= &argv
[i
][2];
4601 if ((p
[0] == 's') && (p
[1] == 0))
4605 /* Optimizing for size forces optimize to be 2. */
4610 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4611 if (optimize_val
!= -1)
4613 optimize
= optimize_val
;
4623 flag_thread_jumps
= 1;
4625 flag_delayed_branch
= 1;
4627 #ifdef CAN_DEBUG_WITHOUT_FP
4628 flag_omit_frame_pointer
= 1;
4634 flag_optimize_sibling_calls
= 1;
4635 flag_cse_follow_jumps
= 1;
4636 flag_cse_skip_blocks
= 1;
4638 flag_expensive_optimizations
= 1;
4639 flag_strength_reduce
= 1;
4640 flag_rerun_cse_after_loop
= 1;
4641 flag_rerun_loop_opt
= 1;
4642 flag_caller_saves
= 1;
4645 #ifdef INSN_SCHEDULING
4646 flag_schedule_insns
= 1;
4647 flag_schedule_insns_after_reload
= 1;
4650 flag_strict_aliasing
= 1;
4651 flag_delete_null_pointer_checks
= 1;
4652 flag_reorder_blocks
= 1;
4657 flag_inline_functions
= 1;
4658 flag_rename_registers
= 1;
4661 if (optimize
< 2 || optimize_size
)
4666 align_functions
= 1;
4669 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4672 set_target_switch ("");
4674 /* Unwind tables are always present in an ABI-conformant IA-64
4675 object file, so the default should be ON. */
4676 #ifdef IA64_UNWIND_INFO
4677 flag_unwind_tables
= IA64_UNWIND_INFO
;
4680 #ifdef OPTIMIZATION_OPTIONS
4681 /* Allow default optimizations to be specified on a per-machine basis. */
4682 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4685 /* Initialize register usage now so switches may override. */
4688 /* Perform normal command line switch decoding. */
4689 for (i
= 1; i
< argc
;)
4691 unsigned int lang_processed
;
4692 unsigned int indep_processed
;
4694 /* Give the language a chance to decode the option for itself. */
4695 lang_processed
= lang_decode_option (argc
- i
, argv
+ i
);
4697 /* Now see if the option also has a language independent meaning.
4698 Some options are both language specific and language independent,
4700 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4702 if (lang_processed
|| indep_processed
)
4703 i
+= MAX (lang_processed
, indep_processed
);
4706 const char *option
= NULL
;
4707 const char *lang
= NULL
;
4710 /* It is possible that the command line switch is not valid for the
4711 current language, but it is valid for another language. In order
4712 to be compatible with previous versions of the compiler (which
4713 did not issue an error message in this case) we check for this
4714 possibility here. If we do find a match, then if extra_warnings
4715 is set we generate a warning message, otherwise we will just
4716 ignore the option. */
4717 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4719 option
= documented_lang_options
[j
].option
;
4722 lang
= documented_lang_options
[j
].description
;
4723 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4727 if (j
!= ARRAY_SIZE (documented_lang_options
))
4731 warning ("Ignoring command line option '%s'", argv
[i
]);
4734 ("(It is valid for %s but not the selected language)",
4738 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4739 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4741 error ("Unrecognized option `%s'", argv
[i
]);
4747 /* Reflect any language-specific diagnostic option setting. */
4748 reshape_diagnostic_buffer ();
4750 /* Checker uses the frame pointer. */
4751 if (flag_check_memory_usage
)
4752 flag_omit_frame_pointer
= 0;
4756 /* Inlining does not work if not optimizing,
4757 so force it not to be done. */
4761 /* The c_decode_option and lang_decode_option functions set
4762 this to `2' if -Wall is used, so we can avoid giving out
4763 lots of errors for people who don't realize what -Wall does. */
4764 if (warn_uninitialized
== 1)
4765 warning ("-Wuninitialized is not supported without -O");
4768 #ifdef OVERRIDE_OPTIONS
4769 /* Some machines may reject certain combinations of options. */
4773 if (exceptions_via_longjmp
== 2)
4775 #ifdef DWARF2_UNWIND_INFO
4776 exceptions_via_longjmp
= ! DWARF2_UNWIND_INFO
;
4778 #ifdef IA64_UNWIND_INFO
4779 exceptions_via_longjmp
= ! IA64_UNWIND_INFO
;
4781 exceptions_via_longjmp
= 1;
4786 /* Since each function gets its own handler data, we can't support the
4787 new model currently, since it depend on a specific rethrow label
4788 which is declared at the front of the table, and we can only
4789 have one such symbol in a file. */
4790 #ifdef IA64_UNWIND_INFO
4791 flag_new_exceptions
= 0;
4794 /* Set up the align_*_log variables, defaulting them to 1 if they
4795 were still unset. */
4796 if (align_loops
<= 0) align_loops
= 1;
4797 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4798 if (align_jumps
<= 0) align_jumps
= 1;
4799 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4800 if (align_labels
<= 0) align_labels
= 1;
4801 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4802 if (align_functions
<= 0) align_functions
= 1;
4803 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4805 if (profile_block_flag
== 3)
4807 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4808 profile_block_flag
= 2;
4811 /* Unrolling all loops implies that standard loop unrolling must also
4813 if (flag_unroll_all_loops
)
4814 flag_unroll_loops
= 1;
4815 /* Loop unrolling requires that strength_reduction be on also. Silently
4816 turn on strength reduction here if it isn't already on. Also, the loop
4817 unrolling code assumes that cse will be run after loop, so that must
4818 be turned on also. */
4819 if (flag_unroll_loops
)
4821 flag_strength_reduce
= 1;
4822 flag_rerun_cse_after_loop
= 1;
4825 /* Warn about options that are not supported on this machine. */
4826 #ifndef INSN_SCHEDULING
4827 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4828 warning ("instruction scheduling not supported on this target machine");
4831 if (flag_delayed_branch
)
4832 warning ("this target machine does not have delayed branches");
4835 user_label_prefix
= USER_LABEL_PREFIX
;
4836 if (flag_leading_underscore
!= -1)
4838 /* If the default prefix is more complicated than "" or "_",
4839 issue a warning and ignore this option. */
4840 if (user_label_prefix
[0] == 0 ||
4841 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4843 user_label_prefix
= flag_leading_underscore
? "_" : "";
4846 warning ("-f%sleading-underscore not supported on this target machine",
4847 flag_leading_underscore
? "" : "no-");
4850 /* If we are in verbose mode, write out the version and maybe all the
4851 option flags in use. */
4854 print_version (stderr
, "");
4856 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4859 compile_file (filename
);
4861 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4864 char *lim
= (char *) sbrk (0);
4866 fnotice (stderr
, "Data size %ld.\n", (long) (lim
- (char *) &environ
));
4871 system ("ps -l 1>&2");
4874 #endif /* not USG */
4877 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4880 return (FATAL_EXIT_CODE
);
4882 return (FATAL_EXIT_CODE
);
4883 return (SUCCESS_EXIT_CODE
);
4886 /* Decode -m switches. */
4887 /* Decode the switch -mNAME. */
4890 set_target_switch (name
)
4894 int valid_target_option
= 0;
4896 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4897 if (!strcmp (target_switches
[j
].name
, name
))
4899 if (target_switches
[j
].value
< 0)
4900 target_flags
&= ~-target_switches
[j
].value
;
4902 target_flags
|= target_switches
[j
].value
;
4903 valid_target_option
= 1;
4906 #ifdef TARGET_OPTIONS
4907 if (!valid_target_option
)
4908 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4910 int len
= strlen (target_options
[j
].prefix
);
4911 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4913 *target_options
[j
].variable
= name
+ len
;
4914 valid_target_option
= 1;
4919 if (!valid_target_option
)
4920 error ("Invalid option `%s'", name
);
4923 /* Print version information to FILE.
4924 Each line begins with INDENT (for the case where FILE is the
4925 assembler output file). */
4928 print_version (file
, indent
)
4933 #define __VERSION__ "[?]"
4937 "%s%s%s version %s (%s) compiled by GNU C version %s.\n"
4939 "%s%s%s version %s (%s) compiled by CC.\n"
4941 , indent
, *indent
!= 0 ? " " : "",
4942 language_string
, version_string
, TARGET_NAME
, __VERSION__
);
4945 /* Print an option value and return the adjusted position in the line.
4946 ??? We don't handle error returns from fprintf (disk full); presumably
4947 other code will catch a disk full though. */
4950 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4953 const char *indent
, *sep
, *term
, *type
, *name
;
4955 /* The ultrix fprintf returns 0 on success, so compute the result we want
4956 here since we need it for the following test. */
4957 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4962 fprintf (file
, "%s", term
);
4967 fprintf (file
, "%s", indent
);
4968 pos
= strlen (indent
);
4970 fprintf (file
, "%s%s%s", sep
, type
, name
);
4975 /* Print active target switches to FILE.
4976 POS is the current cursor position and MAX is the size of a "line".
4977 Each line begins with INDENT and ends with TERM.
4978 Each switch is separated from the next by SEP. */
4981 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
4984 const char *indent
, *sep
, *term
;
4989 /* Print the options as passed. */
4991 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
4992 _("options passed: "), "");
4994 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
4998 if (strcmp (*p
, "-o") == 0)
5004 if (strcmp (*p
, "-quiet") == 0)
5006 if (strcmp (*p
, "-version") == 0)
5011 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5014 fprintf (file
, "%s", term
);
5016 /* Print the -f and -m options that have been enabled.
5017 We don't handle language specific options but printing argv
5020 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5021 _("options enabled: "), "");
5023 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5024 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5025 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5026 "-f", f_options
[j
].string
);
5028 /* Print target specific options. */
5030 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5031 if (target_switches
[j
].name
[0] != '\0'
5032 && target_switches
[j
].value
> 0
5033 && ((target_switches
[j
].value
& target_flags
)
5034 == target_switches
[j
].value
))
5036 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5037 "-m", target_switches
[j
].name
);
5040 #ifdef TARGET_OPTIONS
5041 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5042 if (*target_options
[j
].variable
!= NULL
)
5045 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5046 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5047 prefix
, *target_options
[j
].variable
);
5051 fprintf (file
, "%s", term
);
5054 /* Record the beginning of a new source file, named FILENAME. */
5057 debug_start_source_file (filename
)
5058 register const char *filename ATTRIBUTE_UNUSED
;
5060 #ifdef DBX_DEBUGGING_INFO
5061 if (write_symbols
== DBX_DEBUG
)
5062 dbxout_start_new_source_file (filename
);
5064 #ifdef DWARF_DEBUGGING_INFO
5065 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5066 && write_symbols
== DWARF_DEBUG
)
5067 dwarfout_start_new_source_file (filename
);
5068 #endif /* DWARF_DEBUGGING_INFO */
5069 #ifdef DWARF2_DEBUGGING_INFO
5070 if (write_symbols
== DWARF2_DEBUG
)
5071 dwarf2out_start_source_file (filename
);
5072 #endif /* DWARF2_DEBUGGING_INFO */
5073 #ifdef SDB_DEBUGGING_INFO
5074 if (write_symbols
== SDB_DEBUG
)
5075 sdbout_start_new_source_file (filename
);
5079 /* Record the resumption of a source file. LINENO is the line number in
5080 the source file we are returning to. */
5083 debug_end_source_file (lineno
)
5084 register unsigned lineno ATTRIBUTE_UNUSED
;
5086 #ifdef DBX_DEBUGGING_INFO
5087 if (write_symbols
== DBX_DEBUG
)
5088 dbxout_resume_previous_source_file ();
5090 #ifdef DWARF_DEBUGGING_INFO
5091 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5092 && write_symbols
== DWARF_DEBUG
)
5093 dwarfout_resume_previous_source_file (lineno
);
5094 #endif /* DWARF_DEBUGGING_INFO */
5095 #ifdef DWARF2_DEBUGGING_INFO
5096 if (write_symbols
== DWARF2_DEBUG
)
5097 dwarf2out_end_source_file ();
5098 #endif /* DWARF2_DEBUGGING_INFO */
5099 #ifdef SDB_DEBUGGING_INFO
5100 if (write_symbols
== SDB_DEBUG
)
5101 sdbout_resume_previous_source_file ();
5105 /* Called from check_newline in c-parse.y. The `buffer' parameter contains
5106 the tail part of the directive line, i.e. the part which is past the
5107 initial whitespace, #, whitespace, directive-name, whitespace part. */
5110 debug_define (lineno
, buffer
)
5111 register unsigned lineno ATTRIBUTE_UNUSED
;
5112 register char *buffer ATTRIBUTE_UNUSED
;
5114 #ifdef DWARF_DEBUGGING_INFO
5115 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5116 && write_symbols
== DWARF_DEBUG
)
5117 dwarfout_define (lineno
, buffer
);
5118 #endif /* DWARF_DEBUGGING_INFO */
5119 #ifdef DWARF2_DEBUGGING_INFO
5120 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5121 && write_symbols
== DWARF2_DEBUG
)
5122 dwarf2out_define (lineno
, buffer
);
5123 #endif /* DWARF2_DEBUGGING_INFO */
5126 /* Called from check_newline in c-parse.y. The `buffer' parameter contains
5127 the tail part of the directive line, i.e. the part which is past the
5128 initial whitespace, #, whitespace, directive-name, whitespace part. */
5131 debug_undef (lineno
, buffer
)
5132 register unsigned lineno ATTRIBUTE_UNUSED
;
5133 register char *buffer ATTRIBUTE_UNUSED
;
5135 #ifdef DWARF_DEBUGGING_INFO
5136 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5137 && write_symbols
== DWARF_DEBUG
)
5138 dwarfout_undef (lineno
, buffer
);
5139 #endif /* DWARF_DEBUGGING_INFO */
5140 #ifdef DWARF2_DEBUGGING_INFO
5141 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5142 && write_symbols
== DWARF2_DEBUG
)
5143 dwarf2out_undef (lineno
, buffer
);
5144 #endif /* DWARF2_DEBUGGING_INFO */
5147 /* Returns nonzero if it is appropriate not to emit any debugging
5148 information for BLOCK, because it doesn't contain any instructions.
5149 This may not be the case for blocks containing nested functions, since
5150 we may actually call such a function even though the BLOCK information
5154 debug_ignore_block (block
)
5155 tree block ATTRIBUTE_UNUSED
;
5157 /* Never delete the BLOCK for the outermost scope
5158 of the function; we can refer to names from
5159 that scope even if the block notes are messed up. */
5160 if (is_body_block (block
))
5163 #ifdef DWARF2_DEBUGGING_INFO
5164 if (write_symbols
== DWARF2_DEBUG
)
5165 return dwarf2out_ignore_block (block
);