1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
69 #ifdef DWARF_DEBUGGING_INFO
73 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
74 #include "dwarf2out.h"
77 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
81 #ifdef SDB_DEBUGGING_INFO
85 #ifdef XCOFF_DEBUGGING_INFO
90 /* The extra parameters substantially improve the I/O performance. */
93 vms_fopen (fname
, type
)
97 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
98 fixed arguments, which matches ANSI's specification but not VAXCRTL's
99 pre-ANSI implementation. This hack circumvents the mismatch problem. */
100 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
103 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
104 "deq=64", "fop=tef", "shr=nil");
106 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
109 #define fopen vms_fopen
112 #ifndef DEFAULT_GDB_EXTENSIONS
113 #define DEFAULT_GDB_EXTENSIONS 1
116 /* If more than one debugging type is supported, you must define
117 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
119 This is one long line cause VAXC can't handle a \-newline. */
120 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
121 #ifndef PREFERRED_DEBUGGING_TYPE
122 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
123 #endif /* no PREFERRED_DEBUGGING_TYPE */
124 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
125 so the following code needn't care. */
126 #ifdef DBX_DEBUGGING_INFO
127 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
129 #ifdef SDB_DEBUGGING_INFO
130 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
132 #ifdef DWARF_DEBUGGING_INFO
133 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
135 #ifdef DWARF2_DEBUGGING_INFO
136 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
138 #ifdef XCOFF_DEBUGGING_INFO
139 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
141 #endif /* More than one debugger format enabled. */
143 /* If still not defined, must have been because no debugging formats
145 #ifndef PREFERRED_DEBUGGING_TYPE
146 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
149 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
150 extern char **environ
;
153 /* Carry information from ASM_DECLARE_OBJECT_NAME
154 to ASM_FINISH_DECLARE_OBJECT. */
156 extern int size_directive_output
;
157 extern tree last_assemble_variable_decl
;
159 static void set_target_switch
PARAMS ((const char *));
160 static const char *decl_name
PARAMS ((tree
, int));
162 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
163 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
164 static void compile_file
PARAMS ((const char *));
165 static void display_help
PARAMS ((void));
166 static void display_target_options
PARAMS ((void));
168 static void decode_d_option
PARAMS ((const char *));
169 static int decode_f_option
PARAMS ((const char *));
170 static int decode_W_option
PARAMS ((const char *));
171 static int decode_g_option
PARAMS ((const char *));
172 static unsigned int independent_decode_option
PARAMS ((int, char **));
174 static void print_version
PARAMS ((FILE *, const char *));
175 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
176 const char *, const char *,
177 const char *, const char *));
178 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
179 const char *, const char *));
181 /* Length of line when printing switch values. */
184 /* Name of program invoked, sans directories. */
186 const char *progname
;
188 /* Copy of arguments to toplev_main. */
192 /* Name of current original source file (what was input to cpp).
193 This comes from each #-command in the actual input. */
195 const char *input_filename
;
197 /* Name of top-level original source file (what was input to cpp).
198 This comes from the #-command at the beginning of the actual input.
199 If there isn't any there, then this is the cc1 input file name. */
201 const char *main_input_filename
;
203 /* Current line number in real source file. */
207 /* Nonzero if it is unsafe to create any new pseudo registers. */
210 /* Stack of currently pending input files. */
212 struct file_stack
*input_file_stack
;
214 /* Incremented on each change to input_file_stack. */
215 int input_file_stack_tick
;
217 /* Name to use as base of names for dump output files. */
219 const char *dump_base_name
;
221 /* Bit flags that specify the machine subtype we are compiling for.
222 Bits are tested using macros TARGET_... defined in the tm.h file
223 and set by `-m...' switches. Must be defined in rtlanal.c. */
225 extern int target_flags
;
227 /* Describes a dump file. */
229 struct dump_file_info
231 /* The unique extension to apply, e.g. ".jump". */
232 const char *const extension
;
234 /* The -d<c> character that enables this dump file. */
235 char const debug_switch
;
237 /* True if there is a corresponding graph dump file. */
238 char const graph_dump_p
;
240 /* True if the user selected this dump. */
243 /* True if the files have been initialized (ie truncated). */
247 /* Enumerate the extant dump files. */
286 /* Describes all the dump files. Should be kept in order of the
287 pass and in sync with dump_file_index above.
289 Remaining -d letters:
295 struct dump_file_info dump_file
[DFI_MAX
] =
297 { "rtl", 'r', 0, 0, 0 },
298 { "sibling", 'i', 0, 0, 0 },
299 { "eh", 'h', 0, 0, 0 },
300 { "jump", 'j', 0, 0, 0 },
301 { "cse", 's', 0, 0, 0 },
302 { "addressof", 'F', 0, 0, 0 },
303 { "ssa", 'e', 1, 0, 0 },
304 { "dce", 'X', 1, 0, 0 },
305 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
306 { "gcse", 'G', 1, 0, 0 },
307 { "loop", 'L', 1, 0, 0 },
308 { "cse2", 't', 1, 0, 0 },
309 { "cfg", 'f', 1, 0, 0 },
310 { "bp", 'b', 1, 0, 0 },
311 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "combine", 'c', 1, 0, 0 },
313 { "ce", 'C', 1, 0, 0 },
314 { "regmove", 'N', 1, 0, 0 },
315 { "sched", 'S', 1, 0, 0 },
316 { "lreg", 'l', 1, 0, 0 },
317 { "greg", 'g', 1, 0, 0 },
318 { "postreload", 'o', 1, 0, 0 },
319 { "flow2", 'w', 1, 0, 0 },
320 { "peephole2", 'z', 1, 0, 0 },
321 { "rnreg", 'n', 1, 0, 0 },
322 { "ce2", 'E', 1, 0, 0 },
323 { "sched2", 'R', 1, 0, 0 },
324 { "bbro", 'B', 1, 0, 0 },
325 { "jump2", 'J', 1, 0, 0 },
326 { "mach", 'M', 1, 0, 0 },
327 { "dbr", 'd', 0, 0, 0 },
328 { "stack", 'k', 1, 0, 0 },
331 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
332 static void close_dump_file
PARAMS ((enum dump_file_index
,
333 void (*) (FILE *, rtx
), rtx
));
335 /* Other flags saying which kinds of debugging dump have been requested. */
337 int rtl_dump_and_exit
;
338 int flag_print_asm_name
;
339 static int version_flag
;
340 static char *filename
;
341 enum graph_dump_types graph_dump_format
;
343 /* Name for output file of assembly code, specified with -o. */
347 /* Value of the -G xx switch, and whether it was passed or not. */
351 /* Type(s) of debugging information we are producing (if any).
352 See flags.h for the definitions of the different possible
353 types of debugging information. */
354 enum debug_info_type write_symbols
= NO_DEBUG
;
356 /* Level of debugging information we are producing. See flags.h
357 for the definitions of the different possible levels. */
358 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
360 /* Nonzero means use GNU-only extensions in the generated symbolic
361 debugging information. */
362 /* Currently, this only has an effect when write_symbols is set to
363 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
364 int use_gnu_debug_info_extensions
= 0;
366 /* Nonzero means do optimizations. -O.
367 Particular numeric values stand for particular amounts of optimization;
368 thus, -O2 stores 2 here. However, the optimizations beyond the basic
369 ones are not controlled directly by this variable. Instead, they are
370 controlled by individual `flag_...' variables that are defaulted
371 based on this variable. */
375 /* Nonzero means optimize for size. -Os.
376 The only valid values are zero and non-zero. When optimize_size is
377 non-zero, optimize defaults to 2, but certain individual code
378 bloating optimizations are disabled. */
380 int optimize_size
= 0;
382 /* Nonzero if we should exit after parsing options. */
383 static int exit_after_options
= 0;
385 /* The FUNCTION_DECL for the function currently being compiled,
386 or 0 if between functions. */
387 tree current_function_decl
;
389 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
391 tree current_function_func_begin_label
;
393 /* Pointer to function to compute the name to use to print a declaration.
394 DECL is the declaration in question.
395 VERBOSITY determines what information will be printed:
396 0: DECL_NAME, demangled as necessary.
397 1: and scope information.
398 2: and any other information that might be interesting, such as function
399 parameter types in C++. */
401 const char *(*decl_printable_name
) PARAMS ((tree
, int));
403 /* Pointer to function to compute rtl for a language-specific tree code. */
405 typedef rtx (*lang_expand_expr_t
)
406 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
407 enum expand_modifier modifier
));
409 lang_expand_expr_t lang_expand_expr
= 0;
411 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
413 /* Pointer to function to finish handling an incomplete decl at the
414 end of compilation. */
416 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
418 /* Nonzero if doing dwarf2 duplicate elimination. */
420 int flag_eliminate_dwarf2_dups
= 0;
422 /* Nonzero if generating code to do profiling. */
424 int profile_flag
= 0;
426 /* Nonzero if generating code to do profiling on a line-by-line basis. */
428 int profile_block_flag
;
430 /* Nonzero if generating code to profile program flow graph arcs. */
432 int profile_arc_flag
= 0;
434 /* Nonzero if generating info for gcov to calculate line test coverage. */
436 int flag_test_coverage
= 0;
438 /* Nonzero indicates that branch taken probabilities should be calculated. */
440 int flag_branch_probabilities
= 0;
442 /* Nonzero if basic blocks should be reordered. */
444 int flag_reorder_blocks
= 0;
446 /* Nonzero if registers should be renamed. */
448 int flag_rename_registers
= 0;
450 /* Nonzero for -pedantic switch: warn about anything
451 that standard spec forbids. */
455 /* Temporarily suppress certain warnings.
456 This is set while reading code from a system header file. */
458 int in_system_header
= 0;
460 /* Don't print functions as they are compiled. -quiet. */
464 /* Print times taken by the various passes. -ftime-report. */
468 /* Print memory still in use at end of compilation (which may have little
469 to do with peak memory consumption). -fmem-report. */
473 /* Non-zero means to collect statistics which might be expensive
474 and to print them when we are done. */
475 int flag_detailed_statistics
= 0;
480 /* Nonzero means `char' should be signed. */
482 int flag_signed_char
;
484 /* Nonzero means give an enum type only as many bytes as it needs. */
486 int flag_short_enums
;
488 /* Nonzero for -fcaller-saves: allocate values in regs that need to
489 be saved across function calls, if that produces overall better code.
490 Optional now, so people can test it. */
492 #ifdef DEFAULT_CALLER_SAVES
493 int flag_caller_saves
= 1;
495 int flag_caller_saves
= 0;
498 /* Nonzero if structures and unions should be returned in memory.
500 This should only be defined if compatibility with another compiler or
501 with an ABI is needed, because it results in slower code. */
503 #ifndef DEFAULT_PCC_STRUCT_RETURN
504 #define DEFAULT_PCC_STRUCT_RETURN 1
507 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
509 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
511 /* Nonzero for -fforce-mem: load memory value into a register
512 before arithmetic on it. This makes better cse but slower compilation. */
514 int flag_force_mem
= 0;
516 /* Nonzero for -fforce-addr: load memory address into a register before
517 reference to memory. This makes better cse but slower compilation. */
519 int flag_force_addr
= 0;
521 /* Nonzero for -fdefer-pop: don't pop args after each function call;
522 instead save them up to pop many calls' args with one insns. */
524 int flag_defer_pop
= 0;
526 /* Nonzero for -ffloat-store: don't allocate floats and doubles
527 in extended-precision registers. */
529 int flag_float_store
= 0;
531 /* Nonzero for -fcse-follow-jumps:
532 have cse follow jumps to do a more extensive job. */
534 int flag_cse_follow_jumps
;
536 /* Nonzero for -fcse-skip-blocks:
537 have cse follow a branch around a block. */
538 int flag_cse_skip_blocks
;
540 /* Nonzero for -fexpensive-optimizations:
541 perform miscellaneous relatively-expensive optimizations. */
542 int flag_expensive_optimizations
;
544 /* Nonzero for -fthread-jumps:
545 have jump optimize output of loop. */
547 int flag_thread_jumps
;
549 /* Nonzero enables strength-reduction in loop.c. */
551 int flag_strength_reduce
= 0;
553 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
554 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
555 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
558 int flag_unroll_loops
;
560 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
561 This is generally not a win. */
563 int flag_unroll_all_loops
;
565 /* Nonzero forces all invariant computations in loops to be moved
568 int flag_move_all_movables
= 0;
570 /* Nonzero forces all general induction variables in loops to be
573 int flag_reduce_all_givs
= 0;
575 /* Nonzero to perform full register move optimization passes. This is the
578 int flag_regmove
= 0;
580 /* Nonzero for -fwritable-strings:
581 store string constants in data segment and don't uniquize them. */
583 int flag_writable_strings
= 0;
585 /* Nonzero means don't put addresses of constant functions in registers.
586 Used for compiling the Unix kernel, where strange substitutions are
587 done on the assembly output. */
589 int flag_no_function_cse
= 0;
591 /* Nonzero for -fomit-frame-pointer:
592 don't make a frame pointer in simple functions that don't require one. */
594 int flag_omit_frame_pointer
= 0;
596 /* Nonzero means place each function into its own section on those platforms
597 which support arbitrary section names and unlimited numbers of sections. */
599 int flag_function_sections
= 0;
601 /* ... and similar for data. */
603 int flag_data_sections
= 0;
605 /* Nonzero to inhibit use of define_optimization peephole opts. */
607 int flag_no_peephole
= 0;
609 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
611 int flag_optimize_sibling_calls
= 0;
613 /* Nonzero means the front end generally wants `errno' maintained by math
614 operations, like built-in SQRT. */
616 int flag_errno_math
= 1;
618 /* Nonzero means that unsafe floating-point math optimizations are allowed
619 for the sake of speed. IEEE compliance is not guaranteed, and operations
620 are allowed to assume that their arguments and results are "normal"
621 (e.g., nonnegative for SQRT). */
623 int flag_unsafe_math_optimizations
= 0;
625 /* Zero means that floating-point math operations cannot generate a
626 (user-visible) trap. This is the case, for example, in nonstop
627 IEEE 754 arithmetic. */
629 int flag_trapping_math
= 1;
631 /* 0 means straightforward implementation of complex divide acceptable.
632 1 means wide ranges of inputs must work for complex divide.
633 2 means C99-like requirements for complex divide (not yet implemented). */
635 int flag_complex_divide_method
= 0;
637 /* Nonzero means all references through pointers are volatile. */
641 /* Nonzero means treat all global and extern variables as volatile. */
643 int flag_volatile_global
;
645 /* Nonzero means treat all static variables as volatile. */
647 int flag_volatile_static
;
649 /* Nonzero means just do syntax checking; don't output anything. */
651 int flag_syntax_only
= 0;
653 /* Nonzero means perform global cse. */
655 static int flag_gcse
;
657 /* Nonzero means to use global dataflow analysis to eliminate
658 useless null pointer tests. */
660 static int flag_delete_null_pointer_checks
;
662 /* Nonzero means to do the enhanced load motion during gcse, which trys
663 to hoist loads by not killing them when a store to the same location
666 int flag_gcse_lm
= 1;
668 /* Nonzero means to perform store motion after gcse, which will try to
669 move stores closer to the exit block. Its not very effective without
672 int flag_gcse_sm
= 1;
674 /* Nonzero means to rerun cse after loop optimization. This increases
675 compilation time about 20% and picks up a few more common expressions. */
677 static int flag_rerun_cse_after_loop
;
679 /* Nonzero means to run loop optimizations twice. */
681 int flag_rerun_loop_opt
;
683 /* Nonzero for -finline-functions: ok to inline functions that look like
684 good inline candidates. */
686 int flag_inline_functions
;
688 /* Nonzero for -fkeep-inline-functions: even if we make a function
689 go inline everywhere, keep its definition around for debugging
692 int flag_keep_inline_functions
;
694 /* Nonzero means that functions will not be inlined. */
698 /* Nonzero means that we should emit static const variables
699 regardless of whether or not optimization is turned on. */
701 int flag_keep_static_consts
= 1;
703 /* Nonzero means we should be saving declaration info into a .X file. */
705 int flag_gen_aux_info
= 0;
707 /* Specified name of aux-info file. */
709 static char *aux_info_file_name
;
711 /* Nonzero means make the text shared if supported. */
713 int flag_shared_data
;
715 /* Nonzero means schedule into delayed branch slots if supported. */
717 int flag_delayed_branch
;
719 /* Nonzero if we are compiling pure (sharable) code.
720 Value is 1 if we are doing reasonable (i.e. simple
721 offset into offset table) pic. Value is 2 if we can
722 only perform register offsets. */
726 /* Nonzero means generate extra code for exception handling and enable
727 exception handling. */
731 /* Nonzero means generate frame unwind info table when supported. */
733 int flag_unwind_tables
= 0;
735 /* Nonzero means don't place uninitialized global data in common storage
740 /* Nonzero means pretend it is OK to examine bits of target floats,
741 even if that isn't true. The resulting code will have incorrect constants,
742 but the same series of instructions that the native compiler would make. */
744 int flag_pretend_float
;
746 /* Nonzero means change certain warnings into errors.
747 Usually these are warnings about failure to conform to some standard. */
749 int flag_pedantic_errors
= 0;
751 /* flag_schedule_insns means schedule insns within basic blocks (before
753 flag_schedule_insns_after_reload means schedule insns after
756 int flag_schedule_insns
= 0;
757 int flag_schedule_insns_after_reload
= 0;
759 /* The following flags have effect only for scheduling before register
762 flag_schedule_interblock means schedule insns accross basic blocks.
763 flag_schedule_speculative means allow speculative motion of non-load insns.
764 flag_schedule_speculative_load means allow speculative motion of some
766 flag_schedule_speculative_load_dangerous allows speculative motion of more
769 int flag_schedule_interblock
= 1;
770 int flag_schedule_speculative
= 1;
771 int flag_schedule_speculative_load
= 0;
772 int flag_schedule_speculative_load_dangerous
= 0;
774 int flag_single_precision_constant
;
776 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
777 by a cheaper branch on a count register. */
778 int flag_branch_on_count_reg
= 1;
780 /* -finhibit-size-directive inhibits output of .size for ELF.
781 This is used only for compiling crtstuff.c,
782 and it may be extended to other effects
783 needed for crtstuff.c on other systems. */
784 int flag_inhibit_size_directive
= 0;
786 /* -fverbose-asm causes extra commentary information to be produced in
787 the generated assembly code (to make it more readable). This option
788 is generally only of use to those who actually need to read the
789 generated assembly code (perhaps while debugging the compiler itself).
790 -fno-verbose-asm, the default, causes the extra information
791 to be omitted and is useful when comparing two assembler files. */
793 int flag_verbose_asm
= 0;
795 /* -dA causes debug commentary information to be produced in
796 the generated assembly code (to make it more readable). This option
797 is generally only of use to those who actually need to read the
798 generated assembly code (perhaps while debugging the compiler itself).
799 Currently, this switch is only used by dwarfout.c; however, it is intended
800 to be a catchall for printing debug information in the assembler file. */
802 int flag_debug_asm
= 0;
804 /* -dP causes the rtl to be emitted as a comment in assembly. */
806 int flag_dump_rtl_in_asm
= 0;
808 /* -fgnu-linker specifies use of the GNU linker for initializations.
809 (Or, more generally, a linker that handles initializations.)
810 -fno-gnu-linker says that collect2 will be used. */
812 int flag_gnu_linker
= 0;
814 int flag_gnu_linker
= 1;
820 /* Enable dead code elimination. */
823 /* Tag all structures with __attribute__(packed). */
824 int flag_pack_struct
= 0;
826 /* Emit code to check for stack overflow; also may cause large objects
827 to be allocated dynamically. */
828 int flag_stack_check
;
830 /* When non-NULL, indicates that whenever space is allocated on the
831 stack, the resulting stack pointer must not pass this
832 address---that is, for stacks that grow downward, the stack pointer
833 must always be greater than or equal to this address; for stacks
834 that grow upward, the stack pointer must be less than this address.
835 At present, the rtx may be either a REG or a SYMBOL_REF, although
836 the support provided depends on the backend. */
839 /* -fcheck-memory-usage causes extra code to be generated in order to check
840 memory accesses. This is used by a detector of bad memory accesses such
842 int flag_check_memory_usage
= 0;
844 /* -fprefix-function-name causes function name to be prefixed. This
845 can be used with -fcheck-memory-usage to isolate code compiled with
846 -fcheck-memory-usage. */
847 int flag_prefix_function_name
= 0;
849 /* 0 if pointer arguments may alias each other. True in C.
850 1 if pointer arguments may not alias each other but may alias
852 2 if pointer arguments may not alias each other and may not
853 alias global variables. True in Fortran.
854 This defaults to 0 for C. */
855 int flag_argument_noalias
= 0;
857 /* Nonzero if we should do (language-dependent) alias analysis.
858 Typically, this analysis will assume that expressions of certain
859 types do not alias expressions of certain other types. Only used
860 if alias analysis (in general) is enabled. */
861 int flag_strict_aliasing
= 0;
863 /* Instrument functions with calls at entry and exit, for profiling. */
864 int flag_instrument_function_entry_exit
= 0;
866 /* Nonzero means ignore `#ident' directives. 0 means handle them.
867 On SVR4 targets, it also controls whether or not to emit a
868 string identifying the compiler. */
870 int flag_no_ident
= 0;
872 /* This will perform a peephole pass before sched2. */
873 int flag_peephole2
= 0;
875 /* This will try to guess branch probabilities. */
876 int flag_guess_branch_prob
= 0;
878 /* -fbounded-pointers causes gcc to compile pointers as composite
879 objects occupying three words: the pointer value, the base address
880 of the referent object, and the address immediately beyond the end
881 of the referent object. The base and extent allow us to perform
882 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
883 int flag_bounded_pointers
= 0;
885 /* -fcheck-bounds causes gcc to generate array bounds checks.
886 For C, C++: defaults to value of flag_bounded_pointers.
887 For ObjC: defaults to off.
888 For Java: defaults to on.
889 For Fortran: defaults to off.
890 For CHILL: defaults to off. */
891 int flag_bounds_check
= 0;
893 /* If one, renumber instruction UIDs to reduce the number of
894 unused UIDs if there are a lot of instructions. If greater than
895 one, unconditionally renumber instruction UIDs. */
896 int flag_renumber_insns
= 1;
898 /* Values of the -falign-* flags: how much to align labels in code.
899 0 means `use default', 1 means `don't align'.
900 For each variable, there is an _log variant which is the power
901 of two not less than the variable, for .align output. */
908 int align_labels_log
;
910 int align_functions_log
;
912 /* Table of supported debugging formats. */
916 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
917 constant expression, we use NO_DEBUG in its place. */
918 enum debug_info_type debug_type
;
919 int use_extensions_p
;
920 const char *description
;
924 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
925 N_("Generate debugging info in default format") },
926 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
927 #ifdef DBX_DEBUGGING_INFO
928 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
929 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
931 #ifdef DWARF_DEBUGGING_INFO
932 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
933 { "dwarf+", DWARF_DEBUG
, 1,
934 N_("Generate extended DWARF-1 format debug info") },
936 #ifdef DWARF2_DEBUGGING_INFO
937 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
939 #ifdef XCOFF_DEBUGGING_INFO
940 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
941 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
943 #ifdef SDB_DEBUGGING_INFO
944 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
954 const char *description
;
956 lang_independent_options
;
960 /* Add or remove a leading underscore from user symbols. */
961 int flag_leading_underscore
= -1;
963 /* The user symbol prefix after having resolved same. */
964 const char *user_label_prefix
;
966 static const param_info lang_independent_params
[] = {
967 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
968 { OPTION, DEFAULT, HELP },
969 #include "params.def"
974 /* A default for same. */
975 #ifndef USER_LABEL_PREFIX
976 #define USER_LABEL_PREFIX ""
979 /* Table of language-independent -f options.
980 STRING is the option name. VARIABLE is the address of the variable.
981 ON_VALUE is the value to store in VARIABLE
982 if `-fSTRING' is seen as an option.
983 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
985 lang_independent_options f_options
[] =
987 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
988 N_("Perform DWARF2 duplicate elimination") },
989 {"float-store", &flag_float_store
, 1,
990 N_("Do not store floats in registers") },
991 {"volatile", &flag_volatile
, 1,
992 N_("Consider all mem refs through pointers as volatile") },
993 {"volatile-global", &flag_volatile_global
, 1,
994 N_("Consider all mem refs to global data to be volatile") },
995 {"volatile-static", &flag_volatile_static
, 1,
996 N_("Consider all mem refs to static data to be volatile") },
997 {"defer-pop", &flag_defer_pop
, 1,
998 N_("Defer popping functions args from stack until later") },
999 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1000 N_("When possible do not generate stack frames") },
1001 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1002 N_("Optimize sibling and tail recursive calls") },
1003 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1004 N_("When running CSE, follow jumps to their targets") },
1005 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1006 N_("When running CSE, follow conditional jumps") },
1007 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1008 N_("Perform a number of minor, expensive optimisations") },
1009 {"thread-jumps", &flag_thread_jumps
, 1,
1010 N_("Perform jump threading optimisations") },
1011 {"strength-reduce", &flag_strength_reduce
, 1,
1012 N_("Perform strength reduction optimisations") },
1013 {"unroll-loops", &flag_unroll_loops
, 1,
1014 N_("Perform loop unrolling when iteration count is known") },
1015 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1016 N_("Perform loop unrolling for all loops") },
1017 {"move-all-movables", &flag_move_all_movables
, 1,
1018 N_("Force all loop invariant computations out of loops") },
1019 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1020 N_("Strength reduce all loop general induction variables") },
1021 {"writable-strings", &flag_writable_strings
, 1,
1022 N_("Store strings in writable data section") },
1023 {"peephole", &flag_no_peephole
, 0,
1024 N_("Enable machine specific peephole optimisations") },
1025 {"force-mem", &flag_force_mem
, 1,
1026 N_("Copy memory operands into registers before using") },
1027 {"force-addr", &flag_force_addr
, 1,
1028 N_("Copy memory address constants into regs before using") },
1029 {"function-cse", &flag_no_function_cse
, 0,
1030 N_("Allow function addresses to be held in registers") },
1031 {"inline-functions", &flag_inline_functions
, 1,
1032 N_("Integrate simple functions into their callers") },
1033 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1034 N_("Generate code for funcs even if they are fully inlined") },
1035 {"inline", &flag_no_inline
, 0,
1036 N_("Pay attention to the 'inline' keyword") },
1037 {"keep-static-consts", &flag_keep_static_consts
, 1,
1038 N_("Emit static const variables even if they are not used") },
1039 {"syntax-only", &flag_syntax_only
, 1,
1040 N_("Check for syntax errors, then stop") },
1041 {"shared-data", &flag_shared_data
, 1,
1042 N_("Mark data as shared rather than private") },
1043 {"caller-saves", &flag_caller_saves
, 1,
1044 N_("Enable saving registers around function calls") },
1045 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1046 N_("Return 'short' aggregates in memory, not registers") },
1047 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1048 N_("Return 'short' aggregates in registers") },
1049 {"delayed-branch", &flag_delayed_branch
, 1,
1050 N_("Attempt to fill delay slots of branch instructions") },
1051 {"gcse", &flag_gcse
, 1,
1052 N_("Perform the global common subexpression elimination") },
1053 {"gcse-lm", &flag_gcse_lm
, 1,
1054 N_("Perform enhanced load motion during global subexpression elimination") },
1055 {"gcse-sm", &flag_gcse_sm
, 1,
1056 N_("Perform store motion after global subexpression elimination") },
1057 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1058 N_("Run CSE pass after loop optimisations") },
1059 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1060 N_("Run the loop optimiser twice") },
1061 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1062 N_("Delete useless null pointer checks") },
1063 {"pretend-float", &flag_pretend_float
, 1,
1064 N_("Pretend that host and target use the same FP format") },
1065 {"schedule-insns", &flag_schedule_insns
, 1,
1066 N_("Reschedule instructions before register allocation") },
1067 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1068 N_("Reschedule instructions after register allocation") },
1069 {"sched-interblock",&flag_schedule_interblock
, 1,
1070 N_("Enable scheduling across basic blocks") },
1071 {"sched-spec",&flag_schedule_speculative
, 1,
1072 N_("Allow speculative motion of non-loads") },
1073 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1074 N_("Allow speculative motion of some loads") },
1075 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1076 N_("Allow speculative motion of more loads") },
1077 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1078 N_("Replace add,compare,branch with branch on count reg") },
1079 {"pic", &flag_pic
, 1,
1080 N_("Generate position independent code, if possible") },
1081 {"PIC", &flag_pic
, 2, ""},
1082 {"exceptions", &flag_exceptions
, 1,
1083 N_("Enable exception handling") },
1084 {"unwind-tables", &flag_unwind_tables
, 1,
1085 N_("Just generate unwind tables for exception handling") },
1086 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1087 N_("Support synchronous non-call exceptions") },
1088 {"profile-arcs", &profile_arc_flag
, 1,
1089 N_("Insert arc based program profiling code") },
1090 {"test-coverage", &flag_test_coverage
, 1,
1091 N_("Create data files needed by gcov") },
1092 {"branch-probabilities", &flag_branch_probabilities
, 1,
1093 N_("Use profiling information for branch probabilities") },
1094 {"reorder-blocks", &flag_reorder_blocks
, 1,
1095 N_("Reorder basic blocks to improve code placement") },
1096 {"rename-registers", &flag_rename_registers
, 1,
1097 N_("Do the register renaming optimization pass") },
1098 {"common", &flag_no_common
, 0,
1099 N_("Do not put unitialised globals in the common section") },
1100 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1101 N_("Do not generate .size directives") },
1102 {"function-sections", &flag_function_sections
, 1,
1103 N_("place each function into its own section") },
1104 {"data-sections", &flag_data_sections
, 1,
1105 N_("place data items into their own section") },
1106 {"verbose-asm", &flag_verbose_asm
, 1,
1107 N_("Add extra commentry to assembler output") },
1108 {"gnu-linker", &flag_gnu_linker
, 1,
1109 N_("Output GNU ld formatted global initialisers") },
1110 {"regmove", &flag_regmove
, 1,
1111 N_("Enables a register move optimisation") },
1112 {"optimize-register-move", &flag_regmove
, 1,
1113 N_("Do the full regmove optimization pass") },
1114 {"pack-struct", &flag_pack_struct
, 1,
1115 N_("Pack structure members together without holes") },
1116 {"stack-check", &flag_stack_check
, 1,
1117 N_("Insert stack checking code into the program") },
1118 {"argument-alias", &flag_argument_noalias
, 0,
1119 N_("Specify that arguments may alias each other & globals") },
1120 {"argument-noalias", &flag_argument_noalias
, 1,
1121 N_("Assume arguments may alias globals but not each other") },
1122 {"argument-noalias-global", &flag_argument_noalias
, 2,
1123 N_("Assume arguments do not alias each other or globals") },
1124 {"strict-aliasing", &flag_strict_aliasing
, 1,
1125 N_("Assume strict aliasing rules apply") },
1126 {"align-loops", &align_loops
, 0,
1127 N_("Align the start of loops") },
1128 {"align-jumps", &align_jumps
, 0,
1129 N_("Align labels which are only reached by jumping") },
1130 {"align-labels", &align_labels
, 0,
1131 N_("Align all labels") },
1132 {"align-functions", &align_functions
, 0,
1133 N_("Align the start of functions") },
1134 {"check-memory-usage", &flag_check_memory_usage
, 1,
1135 N_("Generate code to check every memory access") },
1136 {"prefix-function-name", &flag_prefix_function_name
, 1,
1137 N_("Add a prefix to all function names") },
1138 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1139 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1140 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1141 N_("Instrument function entry/exit with profiling calls") },
1142 {"ssa", &flag_ssa
, 1,
1143 N_("Enable SSA optimizations") },
1144 {"dce", &flag_dce
, 1,
1145 N_("Enable dead code elimination") },
1146 {"leading-underscore", &flag_leading_underscore
, 1,
1147 N_("External symbols have a leading underscore") },
1148 {"ident", &flag_no_ident
, 0,
1149 N_("Process #ident directives") },
1150 { "peephole2", &flag_peephole2
, 1,
1151 N_("Enables an rtl peephole pass run before sched2") },
1152 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1153 N_("Enables guessing of branch probabilities") },
1154 {"math-errno", &flag_errno_math
, 1,
1155 N_("Set errno after built-in math functions") },
1156 {"trapping-math", &flag_trapping_math
, 1,
1157 N_("Floating-point operations can trap") },
1158 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1159 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1160 {"bounded-pointers", &flag_bounded_pointers
, 1,
1161 N_("Compile pointers as triples: value, base & end") },
1162 {"bounds-check", &flag_bounds_check
, 1,
1163 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1164 {"single-precision-constant", &flag_single_precision_constant
, 1,
1165 N_("Convert floating point constant to single precision constant") },
1166 {"time-report", &time_report
, 1,
1167 N_("Report time taken by each compiler pass at end of run") },
1168 {"mem-report", &mem_report
, 1,
1169 N_("Report on permanent memory allocation at end of run") },
1170 { "trapv", &flag_trapv
, 1,
1171 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1174 /* Table of language-specific options. */
1176 static struct lang_opt
1179 const char *description
;
1181 documented_lang_options
[] =
1183 /* In order not to overload the --help output, the convention
1184 used here is to only describe those options which are not
1185 enabled by default. */
1188 N_("Compile just for ISO C89") },
1189 { "-fallow-single-precision",
1190 N_("Do not promote floats to double if using -traditional") },
1192 N_("Determine language standard") },
1194 { "-fsigned-bitfields", "" },
1195 { "-funsigned-bitfields",
1196 N_("Make bitfields by unsigned by default") },
1197 { "-fno-signed-bitfields", "" },
1198 { "-fno-unsigned-bitfields","" },
1200 N_("Make 'char' be signed by default") },
1201 { "-funsigned-char",
1202 N_("Make 'char' be unsigned by default") },
1203 { "-fno-signed-char", "" },
1204 { "-fno-unsigned-char", "" },
1206 { "-ftraditional", "" },
1208 N_("Attempt to support traditional K&R style C") },
1209 { "-fnotraditional", "" },
1210 { "-fno-traditional", "" },
1214 N_("Do not recognise the 'asm' keyword") },
1215 { "-fbuiltin", "" },
1217 N_("Do not recognise any built in functions") },
1219 N_("Assume normal C execution environment") },
1220 { "-fno-hosted", "" },
1222 N_("Assume that standard libraries & main might not exist") },
1223 { "-fno-freestanding", "" },
1224 { "-fcond-mismatch",
1225 N_("Allow different types as args of ? operator") },
1226 { "-fno-cond-mismatch", "" },
1227 { "-fdollars-in-identifiers",
1228 N_("Allow the use of $ inside identifiers") },
1229 { "-fno-dollars-in-identifiers", "" },
1230 { "-fpreprocessed", "" },
1231 { "-fno-preprocessed", "" },
1233 N_("Use the same size for double as for float") },
1234 { "-fno-short-double", "" },
1236 N_("Use the smallest fitting integer to hold enums") },
1237 { "-fno-short-enums", "" },
1239 N_("Override the underlying type for wchar_t to `unsigned short'") },
1240 { "-fno-short-wchar", "" },
1243 N_("Enable most warning messages") },
1244 { "-Wbad-function-cast",
1245 N_("Warn about casting functions to incompatible types") },
1246 { "-Wno-bad-function-cast", "" },
1247 { "-Wno-missing-noreturn", "" },
1248 { "-Wmissing-format-attribute",
1249 N_("Warn about functions which might be candidates for format attributes") },
1250 { "-Wno-missing-format-attribute", "" },
1252 N_("Warn about casts which discard qualifiers") },
1253 { "-Wno-cast-qual", "" },
1254 { "-Wchar-subscripts",
1255 N_("Warn about subscripts whose type is 'char'") },
1256 { "-Wno-char-subscripts", "" },
1258 N_("Warn if nested comments are detected") },
1259 { "-Wno-comment", "" },
1261 N_("Warn if nested comments are detected") },
1262 { "-Wno-comments", "" },
1264 N_("Warn about possibly confusing type conversions") },
1265 { "-Wno-conversion", "" },
1267 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1268 { "-Wno-format", "" },
1269 { "-Wformat-y2k", "" },
1270 { "-Wno-format-y2k",
1271 N_("Don't warn about strftime formats yielding 2 digit years") },
1272 { "-Wformat-extra-args", "" },
1273 { "-Wno-format-extra-args",
1274 N_("Don't warn about too many arguments to format functions") },
1275 { "-Wformat-nonliteral",
1276 N_("Warn about non-string-literal format strings") },
1277 { "-Wno-format-nonliteral", "" },
1278 { "-Wformat-security",
1279 N_("Warn about possible security problems with format functions") },
1280 { "-Wno-format-security", "" },
1281 { "-Wimplicit-function-declaration",
1282 N_("Warn about implicit function declarations") },
1283 { "-Wno-implicit-function-declaration", "" },
1284 { "-Werror-implicit-function-declaration", "" },
1286 N_("Warn when a declaration does not specify a type") },
1287 { "-Wno-implicit-int", "" },
1288 { "-Wimplicit", "" },
1289 { "-Wno-implicit", "" },
1291 N_("Warn about the use of the #import directive") },
1292 { "-Wno-import", "" },
1293 { "-Wlong-long","" },
1295 N_("Do not warn about using 'long long' when -pedantic") },
1297 N_("Warn about suspicious declarations of main") },
1298 { "-Wno-main", "" },
1299 { "-Wmissing-braces",
1300 N_("Warn about possibly missing braces around initialisers") },
1301 { "-Wno-missing-braces", "" },
1302 { "-Wmissing-declarations",
1303 N_("Warn about global funcs without previous declarations") },
1304 { "-Wno-missing-declarations", "" },
1305 { "-Wmissing-prototypes",
1306 N_("Warn about global funcs without prototypes") },
1307 { "-Wno-missing-prototypes", "" },
1309 N_("Warn about use of multicharacter literals") },
1310 { "-Wno-multichar", "" },
1311 { "-Wnested-externs",
1312 N_("Warn about externs not at file scope level") },
1313 { "-Wno-nested-externs", "" },
1315 N_("Warn about possible missing parentheses") },
1316 { "-Wno-parentheses", "" },
1317 { "-Wsequence-point",
1318 N_("Warn about possible violations of sequence point rules") },
1319 { "-Wno-sequence-point", "" },
1320 { "-Wpointer-arith",
1321 N_("Warn about function pointer arithmetic") },
1322 { "-Wno-pointer-arith", "" },
1323 { "-Wredundant-decls",
1324 N_("Warn about multiple declarations of the same object") },
1325 { "-Wno-redundant-decls", "" },
1327 N_("Warn about signed/unsigned comparisons") },
1328 { "-Wno-sign-compare", "" },
1330 N_("Warn about testing equality of floating point numbers") },
1331 { "-Wno-float-equal", "" },
1332 { "-Wunknown-pragmas",
1333 N_("Warn about unrecognized pragmas") },
1334 { "-Wno-unknown-pragmas", "" },
1335 { "-Wstrict-prototypes",
1336 N_("Warn about non-prototyped function decls") },
1337 { "-Wno-strict-prototypes", "" },
1339 N_("Warn about constructs whose meaning change in ISO C") },
1340 { "-Wno-traditional", "" },
1342 N_("Warn when trigraphs are encountered") },
1343 { "-Wno-trigraphs", "" },
1345 { "-Wno-undef", "" },
1346 { "-Wwrite-strings",
1347 N_("Mark strings as 'const char *'") },
1348 { "-Wno-write-strings", "" },
1350 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1352 #include "options.h"
1356 /* Here is a table, controlled by the tm.h file, listing each -m switch
1357 and which bits in `target_switches' it should set or clear.
1358 If VALUE is positive, it is bits to set.
1359 If VALUE is negative, -VALUE is bits to clear.
1360 (The sign bit is not used so there is no confusion.) */
1366 const char *description
;
1368 target_switches
[] = TARGET_SWITCHES
;
1370 /* This table is similar, but allows the switch to have a value. */
1372 #ifdef TARGET_OPTIONS
1376 const char **variable
;
1377 const char *description
;
1379 target_options
[] = TARGET_OPTIONS
;
1382 /* Options controlling warnings. */
1384 /* Don't print warning messages. -w. */
1386 int inhibit_warnings
= 0;
1388 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1390 int warn_system_headers
= 0;
1392 /* Print various extra warnings. -W. */
1394 int extra_warnings
= 0;
1396 /* Treat warnings as errors. -Werror. */
1398 int warnings_are_errors
= 0;
1400 /* Nonzero to warn about unused variables, functions et.al. */
1402 int warn_unused_function
;
1403 int warn_unused_label
;
1404 int warn_unused_parameter
;
1405 int warn_unused_variable
;
1406 int warn_unused_value
;
1409 set_Wunused (setting
)
1412 warn_unused_function
= setting
;
1413 warn_unused_label
= setting
;
1414 /* Unused function parameter warnings are reported when either ``-W
1415 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1416 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1418 warn_unused_parameter
= 0;
1419 else if (!warn_unused_parameter
)
1420 warn_unused_parameter
= -1;
1421 warn_unused_variable
= setting
;
1422 warn_unused_value
= setting
;
1425 /* Nonzero to warn about code which is never reached. */
1427 int warn_notreached
;
1429 /* Nonzero to warn about variables used before they are initialized. */
1431 int warn_uninitialized
;
1433 /* Nonzero means warn about all declarations which shadow others. */
1437 /* Warn if a switch on an enum fails to have a case for every enum value. */
1441 /* Nonzero means warn about function definitions that default the return type
1442 or that use a null return and have a return-type other than void. */
1444 int warn_return_type
;
1446 /* Nonzero means warn about pointer casts that increase the required
1447 alignment of the target type (and might therefore lead to a crash
1448 due to a misaligned access). */
1450 int warn_cast_align
;
1452 /* Nonzero means warn about any objects definitions whose size is larger
1453 than N bytes. Also want about function definitions whose returned
1454 values are larger than N bytes. The value N is in `larger_than_size'. */
1456 int warn_larger_than
;
1457 HOST_WIDE_INT larger_than_size
;
1459 /* Nonzero means warn if inline function is too large. */
1463 /* Warn if a function returns an aggregate,
1464 since there are often incompatible calling conventions for doing this. */
1466 int warn_aggregate_return
;
1468 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1472 /* Warn when gcc pads a structure to an alignment boundary. */
1476 /* Warn when an optimization pass is disabled. */
1478 int warn_disabled_optimization
;
1480 /* Warn about functions which might be candidates for attribute noreturn. */
1482 int warn_missing_noreturn
;
1484 /* Likewise for -W. */
1486 lang_independent_options W_options
[] =
1488 {"unused-function", &warn_unused_function
, 1,
1489 N_("Warn when a function is unused") },
1490 {"unused-label", &warn_unused_label
, 1,
1491 N_("Warn when a label is unused") },
1492 {"unused-parameter", &warn_unused_parameter
, 1,
1493 N_("Warn when a function parameter is unused") },
1494 {"unused-variable", &warn_unused_variable
, 1,
1495 N_("Warn when a variable is unused") },
1496 {"unused-value", &warn_unused_value
, 1,
1497 N_("Warn when an expression value is unused") },
1498 {"system-headers", &warn_system_headers
, 1,
1499 N_("Do not suppress warnings from system headers") },
1500 {"error", &warnings_are_errors
, 1,
1501 N_("Treat all warnings as errors") },
1502 {"shadow", &warn_shadow
, 1,
1503 N_("Warn when one local variable shadows another") },
1504 {"switch", &warn_switch
, 1,
1505 N_("Warn about enumerated switches missing a specific case") },
1506 {"aggregate-return", &warn_aggregate_return
, 1,
1507 N_("Warn about returning structures, unions or arrays") },
1508 {"cast-align", &warn_cast_align
, 1,
1509 N_("Warn about pointer casts which increase alignment") },
1510 {"unreachable-code", &warn_notreached
, 1,
1511 N_("Warn about code that will never be executed") },
1512 {"uninitialized", &warn_uninitialized
, 1,
1513 N_("Warn about unitialized automatic variables") },
1514 {"inline", &warn_inline
, 1,
1515 N_("Warn when an inlined function cannot be inlined") },
1516 {"packed", &warn_packed
, 1,
1517 N_("Warn when the packed attribute has no effect on struct layout") },
1518 {"padded", &warn_padded
, 1,
1519 N_("Warn when padding is required to align struct members") },
1520 {"disabled-optimization", &warn_disabled_optimization
, 1,
1521 N_("Warn when an optimization pass is disabled") },
1522 {"missing-noreturn", &warn_missing_noreturn
, 1,
1523 N_("Warn about functions which might be candidates for attribute noreturn") }
1526 /* The following routines are useful in setting all the flags that
1527 -ffast-math and -fno-fast-math imply. */
1530 set_fast_math_flags ()
1532 flag_trapping_math
= 0;
1533 flag_unsafe_math_optimizations
= 1;
1534 flag_errno_math
= 0;
1538 set_no_fast_math_flags ()
1540 flag_trapping_math
= 1;
1541 flag_unsafe_math_optimizations
= 0;
1542 flag_errno_math
= 1;
1546 /* Output files for assembler code (real compiler output)
1547 and debugging dumps. */
1550 FILE *aux_info_file
;
1551 FILE *rtl_dump_file
= NULL
;
1553 /* Decode the string P as an integral parameter.
1554 If the string is indeed an integer return its numeric value else
1555 issue an Invalid Option error for the option PNAME and return DEFVAL.
1556 If PNAME is zero just return DEFVAL, do not call error. */
1559 read_integral_parameter (p
, pname
, defval
)
1564 const char *endp
= p
;
1568 if (*endp
>= '0' && *endp
<= '9')
1577 error ("Invalid option `%s'", pname
);
1585 /* This is the default decl_printable_name function. */
1588 decl_name (decl
, verbosity
)
1590 int verbosity ATTRIBUTE_UNUSED
;
1592 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1596 /* This calls abort and is used to avoid problems when abort if a macro.
1597 It is used when we need to pass the address of abort. */
1605 /* When `malloc.c' is compiled with `rcheck' defined,
1606 it calls this function to report clobberage. */
1610 const char *s ATTRIBUTE_UNUSED
;
1615 /* Return the logarithm of X, base 2, considering X unsigned,
1616 if X is a power of 2. Otherwise, returns -1.
1618 This should be used via the `exact_log2' macro. */
1622 register unsigned HOST_WIDE_INT x
;
1624 register int log
= 0;
1625 /* Test for 0 or a power of 2. */
1626 if (x
== 0 || x
!= (x
& -x
))
1628 while ((x
>>= 1) != 0)
1633 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1634 If X is 0, return -1.
1636 This should be used via the floor_log2 macro. */
1640 register unsigned HOST_WIDE_INT x
;
1642 register int log
= -1;
1649 static int float_handler_set
;
1651 jmp_buf float_handler
;
1653 /* Signals actually come here. */
1656 float_signal (signo
)
1657 /* If this is missing, some compilers complain. */
1658 int signo ATTRIBUTE_UNUSED
;
1660 if (float_handled
== 0)
1661 crash_signal (signo
);
1664 /* On System-V derived systems, we must reinstall the signal handler.
1665 This is harmless on BSD-derived systems. */
1666 signal (SIGFPE
, float_signal
);
1667 longjmp (float_handler
, 1);
1670 /* Specify where to longjmp to when a floating arithmetic error happens.
1671 If HANDLER is 0, it means don't handle the errors any more. */
1674 set_float_handler (handler
)
1677 float_handled
= (handler
!= 0);
1679 memcpy (float_handler
, handler
, sizeof (float_handler
));
1681 if (float_handled
&& ! float_handler_set
)
1683 signal (SIGFPE
, float_signal
);
1684 float_handler_set
= 1;
1688 /* This is a wrapper function for code which might elicit an
1689 arithmetic exception. That code should be passed in as a function
1690 pointer FN, and one argument DATA. DATA is usually a struct which
1691 contains the real input and output for function FN. This function
1692 returns 0 (failure) if longjmp was called (i.e. an exception
1693 occured.) It returns 1 (success) otherwise. */
1696 do_float_handler (fn
, data
)
1697 void (*fn
) PARAMS ((PTR
));
1704 /* We got here via longjmp () caused by an exception in function
1706 set_float_handler (NULL
);
1710 set_float_handler (buf
);
1712 set_float_handler (NULL
);
1716 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1717 into ICE messages, which is much more user friendly. */
1720 crash_signal (signo
)
1723 internal_error ("Internal error: %s", strsignal (signo
));
1726 /* Strip off a legitimate source ending from the input string NAME of
1727 length LEN. Rather than having to know the names used by all of
1728 our front ends, we strip off an ending of a period followed by
1729 up to five characters. (Java uses ".class".) */
1732 strip_off_ending (name
, len
)
1737 for (i
= 2; i
< 6 && len
> i
; i
++)
1739 if (name
[len
- i
] == '.')
1741 name
[len
- i
] = '\0';
1747 /* Output a quoted string. */
1750 output_quoted_string (asm_file
, string
)
1754 #ifdef OUTPUT_QUOTED_STRING
1755 OUTPUT_QUOTED_STRING (asm_file
, string
);
1759 putc ('\"', asm_file
);
1760 while ((c
= *string
++) != 0)
1762 if (c
== '\"' || c
== '\\')
1763 putc ('\\', asm_file
);
1766 putc ('\"', asm_file
);
1770 /* Output a file name in the form wanted by System V. */
1773 output_file_directive (asm_file
, input_name
)
1775 const char *input_name
;
1777 int len
= strlen (input_name
);
1778 const char *na
= input_name
+ len
;
1780 /* NA gets INPUT_NAME sans directory names. */
1781 while (na
> input_name
)
1783 if (IS_DIR_SEPARATOR (na
[-1]))
1788 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1789 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1791 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1792 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1794 fprintf (asm_file
, "\t.file\t");
1795 output_quoted_string (asm_file
, na
);
1796 fputc ('\n', asm_file
);
1801 /* Routine to open a dump file. Return true if the dump file is enabled. */
1804 open_dump_file (index
, decl
)
1805 enum dump_file_index index
;
1809 const char *open_arg
;
1812 if (! dump_file
[index
].enabled
)
1815 timevar_push (TV_DUMP
);
1816 if (rtl_dump_file
!= NULL
)
1817 fclose (rtl_dump_file
);
1819 sprintf (seq
, ".%02d.", index
);
1821 if (! dump_file
[index
].initialized
)
1823 /* If we've not initialized the files, do so now. */
1824 if (graph_dump_format
!= no_graph
1825 && dump_file
[index
].graph_dump_p
)
1827 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1828 clean_graph_dump_file (dump_base_name
, dump_name
);
1831 dump_file
[index
].initialized
= 1;
1837 dump_name
= concat (dump_base_name
, seq
,
1838 dump_file
[index
].extension
, NULL
);
1840 rtl_dump_file
= fopen (dump_name
, open_arg
);
1841 if (rtl_dump_file
== NULL
)
1842 fatal_io_error ("can't open %s", dump_name
);
1847 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1848 decl_printable_name (decl
, 2));
1850 timevar_pop (TV_DUMP
);
1854 /* Routine to close a dump file. */
1857 close_dump_file (index
, func
, insns
)
1858 enum dump_file_index index
;
1859 void (*func
) PARAMS ((FILE *, rtx
));
1862 if (! rtl_dump_file
)
1865 timevar_push (TV_DUMP
);
1867 && graph_dump_format
!= no_graph
1868 && dump_file
[index
].graph_dump_p
)
1873 sprintf (seq
, ".%02d.", index
);
1874 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1875 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1880 func (rtl_dump_file
, insns
);
1882 fflush (rtl_dump_file
);
1883 fclose (rtl_dump_file
);
1885 rtl_dump_file
= NULL
;
1886 timevar_pop (TV_DUMP
);
1889 /* Do any final processing required for the declarations in VEC, of
1890 which there are LEN. We write out inline functions and variables
1891 that have been deferred until this point, but which are required.
1892 Returns non-zero if anything was put out. */
1895 wrapup_global_declarations (vec
, len
)
1902 int output_something
= 0;
1904 for (i
= 0; i
< len
; i
++)
1908 /* We're not deferring this any longer. */
1909 DECL_DEFER_OUTPUT (decl
) = 0;
1911 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1912 && incomplete_decl_finalize_hook
!= 0)
1913 (*incomplete_decl_finalize_hook
) (decl
);
1916 /* Now emit any global variables or functions that we have been
1917 putting off. We need to loop in case one of the things emitted
1918 here references another one which comes earlier in the list. */
1922 for (i
= 0; i
< len
; i
++)
1926 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1929 /* Don't write out static consts, unless we still need them.
1931 We also keep static consts if not optimizing (for debugging),
1932 unless the user specified -fno-keep-static-consts.
1933 ??? They might be better written into the debug information.
1934 This is possible when using DWARF.
1936 A language processor that wants static constants to be always
1937 written out (even if it is not used) is responsible for
1938 calling rest_of_decl_compilation itself. E.g. the C front-end
1939 calls rest_of_decl_compilation from finish_decl.
1940 One motivation for this is that is conventional in some
1941 environments to write things like:
1942 static const char rcsid[] = "... version string ...";
1943 intending to force the string to be in the executable.
1945 A language processor that would prefer to have unneeded
1946 static constants "optimized away" would just defer writing
1947 them out until here. E.g. C++ does this, because static
1948 constants are often defined in header files.
1950 ??? A tempting alternative (for both C and C++) would be
1951 to force a constant to be written if and only if it is
1952 defined in a main file, as opposed to an include file. */
1954 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1955 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1956 && !DECL_COMDAT (decl
))
1958 && flag_keep_static_consts
1959 && !DECL_ARTIFICIAL (decl
))
1960 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1963 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1966 if (TREE_CODE (decl
) == FUNCTION_DECL
1967 && DECL_INITIAL (decl
) != 0
1968 && DECL_SAVED_INSNS (decl
) != 0
1969 && (flag_keep_inline_functions
1970 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1971 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1974 output_inline_function (decl
);
1979 output_something
= 1;
1983 return output_something
;
1986 /* Issue appropriate warnings for the global declarations in VEC (of
1987 which there are LEN). Output debugging information for them. */
1990 check_global_declarations (vec
, len
)
1997 for (i
= 0; i
< len
; i
++)
2001 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2002 && ! TREE_ASM_WRITTEN (decl
))
2003 /* Cancel the RTL for this decl so that, if debugging info
2004 output for global variables is still to come,
2005 this one will be omitted. */
2006 SET_DECL_RTL (decl
, NULL_RTX
);
2008 /* Warn about any function
2009 declared static but not defined.
2010 We don't warn about variables,
2011 because many programs have static variables
2012 that exist only to get some text into the object file. */
2013 if (TREE_CODE (decl
) == FUNCTION_DECL
2014 && (warn_unused_function
2015 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2016 && DECL_INITIAL (decl
) == 0
2017 && DECL_EXTERNAL (decl
)
2018 && ! DECL_ARTIFICIAL (decl
)
2019 && ! TREE_PUBLIC (decl
))
2021 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2022 pedwarn_with_decl (decl
,
2023 "`%s' used but never defined");
2025 warning_with_decl (decl
,
2026 "`%s' declared `static' but never defined");
2027 /* This symbol is effectively an "extern" declaration now. */
2028 TREE_PUBLIC (decl
) = 1;
2029 assemble_external (decl
);
2032 /* Warn about static fns or vars defined but not used,
2033 but not about inline functions or static consts
2034 since defining those in header files is normal practice. */
2035 if (((warn_unused_function
2036 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2037 || (warn_unused_variable
2038 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2039 && ! DECL_IN_SYSTEM_HEADER (decl
)
2040 && ! DECL_EXTERNAL (decl
)
2041 && ! TREE_PUBLIC (decl
)
2042 && ! TREE_USED (decl
)
2043 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2044 /* The TREE_USED bit for file-scope decls
2045 is kept in the identifier, to handle multiple
2046 external decls in different scopes. */
2047 && ! TREE_USED (DECL_NAME (decl
)))
2048 warning_with_decl (decl
, "`%s' defined but not used");
2050 timevar_push (TV_SYMOUT
);
2051 #ifdef SDB_DEBUGGING_INFO
2052 /* The COFF linker can move initialized global vars to the end.
2053 And that can screw up the symbol ordering.
2054 By putting the symbols in that order to begin with,
2055 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2056 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2057 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2058 && ! DECL_EXTERNAL (decl
)
2059 && DECL_RTL (decl
) != 0)
2060 sdbout_symbol (decl
, 0);
2062 /* Output COFF information for non-global
2063 file-scope initialized variables. */
2064 if (write_symbols
== SDB_DEBUG
2065 && TREE_CODE (decl
) == VAR_DECL
2066 && DECL_INITIAL (decl
)
2067 && ! DECL_EXTERNAL (decl
)
2068 && DECL_RTL (decl
) != 0
2069 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2070 sdbout_toplevel_data (decl
);
2071 #endif /* SDB_DEBUGGING_INFO */
2072 #ifdef DWARF_DEBUGGING_INFO
2073 /* Output DWARF information for file-scope tentative data object
2074 declarations, file-scope (extern) function declarations (which
2075 had no corresponding body) and file-scope tagged type declarations
2076 and definitions which have not yet been forced out. */
2078 if (write_symbols
== DWARF_DEBUG
2079 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2080 dwarfout_file_scope_decl (decl
, 1);
2082 #ifdef DWARF2_DEBUGGING_INFO
2083 /* Output DWARF2 information for file-scope tentative data object
2084 declarations, file-scope (extern) function declarations (which
2085 had no corresponding body) and file-scope tagged type declarations
2086 and definitions which have not yet been forced out. */
2088 if (write_symbols
== DWARF2_DEBUG
2089 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2090 dwarf2out_decl (decl
);
2092 timevar_pop (TV_SYMOUT
);
2096 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2097 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2098 INPUT_FILENAME and LINENO accordingly. */
2101 push_srcloc (file
, line
)
2105 struct file_stack
*fs
;
2107 if (input_file_stack
)
2109 input_file_stack
->name
= input_filename
;
2110 input_file_stack
->line
= lineno
;
2113 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2114 fs
->name
= input_filename
= file
;
2115 fs
->line
= lineno
= line
;
2116 fs
->indent_level
= 0;
2117 fs
->next
= input_file_stack
;
2118 input_file_stack
= fs
;
2119 input_file_stack_tick
++;
2122 /* Pop the top entry off the stack of presently open source files.
2123 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2129 struct file_stack
*fs
;
2131 fs
= input_file_stack
;
2132 input_file_stack
= fs
->next
;
2134 input_file_stack_tick
++;
2135 /* The initial source file is never popped. */
2136 if (!input_file_stack
)
2138 input_filename
= input_file_stack
->name
;
2139 lineno
= input_file_stack
->line
;
2142 /* Compile an entire file of output from cpp, named NAME.
2143 Write a file of assembly output and various debugging dumps. */
2151 int name_specified
= name
!= 0;
2153 if (dump_base_name
== 0)
2154 dump_base_name
= name
? name
: "gccdump";
2159 /* Start timing total execution time. */
2162 timevar_start (TV_TOTAL
);
2164 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2165 because then the driver will have provided the name of a temporary
2166 file or bit bucket for us. */
2168 if (! name_specified
&& asm_file_name
== 0)
2169 asm_out_file
= stdout
;
2172 if (asm_file_name
== 0)
2174 int len
= strlen (dump_base_name
);
2175 char *dumpname
= (char *) xmalloc (len
+ 6);
2176 memcpy (dumpname
, dump_base_name
, len
+ 1);
2177 strip_off_ending (dumpname
, len
);
2178 strcat (dumpname
, ".s");
2179 asm_file_name
= dumpname
;
2181 if (!strcmp (asm_file_name
, "-"))
2182 asm_out_file
= stdout
;
2184 asm_out_file
= fopen (asm_file_name
, "w");
2185 if (asm_out_file
== 0)
2186 fatal_io_error ("can't open %s for writing", asm_file_name
);
2189 /* Initialize data in various passes. */
2192 name
= init_parse (name
);
2193 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2194 || debug_info_level
== DINFO_LEVEL_VERBOSE
2195 || flag_test_coverage
2196 || warn_notreached
);
2199 init_decl_processing ();
2205 init_function_once ();
2206 init_stor_layout_once ();
2207 init_varasm_once ();
2208 init_EXPR_INSN_LIST_cache ();
2210 /* The following initialization functions need to generate rtl, so
2211 provide a dummy function context for them. */
2212 init_dummy_function_start ();
2215 if (flag_caller_saves
)
2216 init_caller_save ();
2217 expand_dummy_function_end ();
2219 /* If auxiliary info generation is desired, open the output file.
2220 This goes in the same directory as the source file--unlike
2221 all the other output files. */
2222 if (flag_gen_aux_info
)
2224 aux_info_file
= fopen (aux_info_file_name
, "w");
2225 if (aux_info_file
== 0)
2226 fatal_io_error ("can't open %s", aux_info_file_name
);
2229 #ifdef IO_BUFFER_SIZE
2230 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2231 _IOFBF
, IO_BUFFER_SIZE
);
2235 name
= ggc_strdup (name
);
2237 input_filename
= name
;
2239 /* Put an entry on the input file stack for the main input file. */
2240 push_srcloc (input_filename
, 0);
2242 /* Perform language-specific initialization.
2243 This may set main_input_filename. */
2244 if (lang_hooks
.init
)
2245 (*lang_hooks
.init
) ();
2247 /* If the input doesn't start with a #line, use the input name
2248 as the official input file name. */
2249 if (main_input_filename
== 0)
2250 main_input_filename
= name
;
2252 if (flag_syntax_only
)
2254 write_symbols
= NO_DEBUG
;
2256 profile_block_flag
= 0;
2260 ASM_FILE_START (asm_out_file
);
2262 #ifdef ASM_COMMENT_START
2263 if (flag_verbose_asm
)
2265 /* Print the list of options in effect. */
2266 print_version (asm_out_file
, ASM_COMMENT_START
);
2267 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2268 ASM_COMMENT_START
, " ", "\n");
2269 /* Add a blank line here so it appears in assembler output but not
2271 fprintf (asm_out_file
, "\n");
2274 } /* ! flag_syntax_only */
2276 #ifndef ASM_OUTPUT_SECTION_NAME
2277 if (flag_function_sections
)
2279 warning ("-ffunction-sections not supported for this target.");
2280 flag_function_sections
= 0;
2282 if (flag_data_sections
)
2284 warning ("-fdata-sections not supported for this target.");
2285 flag_data_sections
= 0;
2289 if (flag_function_sections
2290 && (profile_flag
|| profile_block_flag
))
2292 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2293 flag_function_sections
= 0;
2296 #ifndef OBJECT_FORMAT_ELF
2297 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2298 warning ("-ffunction-sections may affect debugging on some targets.");
2301 /* If dbx symbol table desired, initialize writing it
2302 and output the predefined types. */
2303 timevar_push (TV_SYMOUT
);
2304 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2305 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2306 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2308 #ifdef SDB_DEBUGGING_INFO
2309 if (write_symbols
== SDB_DEBUG
)
2310 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2312 #ifdef DWARF_DEBUGGING_INFO
2313 if (write_symbols
== DWARF_DEBUG
)
2314 dwarfout_init (asm_out_file
, main_input_filename
);
2316 #ifdef DWARF2_UNWIND_INFO
2317 if (dwarf2out_do_frame ())
2318 dwarf2out_frame_init ();
2320 #ifdef DWARF2_DEBUGGING_INFO
2321 if (write_symbols
== DWARF2_DEBUG
)
2322 dwarf2out_init (asm_out_file
, main_input_filename
);
2324 timevar_pop (TV_SYMOUT
);
2326 /* Initialize yet another pass. */
2328 init_final (main_input_filename
);
2329 init_branch_prob (dump_base_name
);
2331 timevar_push (TV_PARSE
);
2333 /* Call the parser, which parses the entire file
2334 (calling rest_of_compilation for each function). */
2336 if (yyparse () != 0)
2338 if (errorcount
== 0)
2339 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2341 /* In case there were missing closebraces,
2342 get us back to the global binding level. */
2343 while (! global_bindings_p ())
2347 /* Compilation is now finished except for writing
2348 what's left of the symbol table output. */
2350 timevar_pop (TV_PARSE
);
2352 if (flag_syntax_only
)
2355 globals
= getdecls ();
2357 /* Really define vars that have had only a tentative definition.
2358 Really output inline functions that must actually be callable
2359 and have not been output so far. */
2362 int len
= list_length (globals
);
2363 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2367 /* Process the decls in reverse order--earliest first.
2368 Put them into VEC from back to front, then take out from front. */
2370 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2371 vec
[len
- i
- 1] = decl
;
2373 wrapup_global_declarations (vec
, len
);
2375 /* This must occur after the loop to output deferred functions. Else
2376 the profiler initializer would not be emitted if all the functions
2377 in this compilation unit were deferred.
2379 output_func_start_profiler can not cause any additional functions or
2380 data to need to be output, so it need not be in the deferred function
2382 output_func_start_profiler ();
2384 check_global_declarations (vec
, len
);
2390 /* Write out any pending weak symbol declarations. */
2394 /* Do dbx symbols. */
2395 timevar_push (TV_SYMOUT
);
2396 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2397 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2398 dbxout_finish (asm_out_file
, main_input_filename
);
2401 #ifdef DWARF_DEBUGGING_INFO
2402 if (write_symbols
== DWARF_DEBUG
)
2406 #ifdef DWARF2_UNWIND_INFO
2407 if (dwarf2out_do_frame ())
2408 dwarf2out_frame_finish ();
2411 #ifdef DWARF2_DEBUGGING_INFO
2412 if (write_symbols
== DWARF2_DEBUG
)
2413 dwarf2out_finish ();
2415 timevar_pop (TV_SYMOUT
);
2417 /* Output some stuff at end of file if nec. */
2419 dw2_output_indirect_constants ();
2421 end_final (dump_base_name
);
2423 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2425 timevar_push (TV_DUMP
);
2426 open_dump_file (DFI_bp
, NULL
);
2430 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2431 timevar_pop (TV_DUMP
);
2435 ASM_FILE_END (asm_out_file
);
2438 /* Attach a special .ident directive to the end of the file to identify
2439 the version of GCC which compiled this code. The format of the .ident
2440 string is patterned after the ones produced by native SVR4 compilers. */
2443 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2444 IDENT_ASM_OP
, version_string
);
2447 /* Language-specific end of compilation actions. */
2449 if (lang_hooks
.finish
)
2450 (*lang_hooks
.finish
) ();
2452 /* Close the dump files. */
2454 if (flag_gen_aux_info
)
2456 fclose (aux_info_file
);
2458 unlink (aux_info_file_name
);
2461 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2463 timevar_push (TV_DUMP
);
2464 dump_combine_total_stats (rtl_dump_file
);
2465 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2466 timevar_pop (TV_DUMP
);
2469 /* Close non-debugging input and output files. Take special care to note
2470 whether fclose returns an error, since the pages might still be on the
2471 buffer chain while the file is open. */
2475 if (ferror (asm_out_file
) != 0)
2476 fatal_io_error ("error writing to %s", asm_file_name
);
2477 if (fclose (asm_out_file
) != 0)
2478 fatal_io_error ("error closing %s", asm_file_name
);
2480 /* Do whatever is necessary to finish printing the graphs. */
2481 if (graph_dump_format
!= no_graph
)
2485 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2486 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2491 sprintf (seq
, ".%02d.", i
);
2492 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2493 finish_graph_dump_file (dump_base_name
, suffix
);
2500 ggc_print_statistics ();
2501 stringpool_statistics ();
2504 /* Free up memory for the benefit of leak detectors. */
2507 /* Stop timing total execution time. */
2508 timevar_stop (TV_TOTAL
);
2510 /* Print the times. */
2512 timevar_print (stderr
);
2515 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2516 and TYPE_DECL nodes.
2518 This does nothing for local (non-static) variables, unless the
2519 variable is a register variable with an ASMSPEC. In that case, or
2520 if the variable is not an automatic, it sets up the RTL and
2521 outputs any assembler code (label definition, storage allocation
2522 and initialization).
2524 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2525 the assembler symbol name to be used. TOP_LEVEL is nonzero
2526 if this declaration is not within a function. */
2529 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2531 const char *asmspec
;
2535 /* Declarations of variables, and of functions defined elsewhere. */
2537 /* The most obvious approach, to put an #ifndef around where
2538 this macro is used, doesn't work since it's inside a macro call. */
2539 #ifndef ASM_FINISH_DECLARE_OBJECT
2540 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2543 /* Forward declarations for nested functions are not "external",
2544 but we need to treat them as if they were. */
2545 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2546 || TREE_CODE (decl
) == FUNCTION_DECL
)
2548 timevar_push (TV_VARCONST
);
2550 make_decl_rtl (decl
, asmspec
);
2551 /* Don't output anything
2552 when a tentative file-scope definition is seen.
2553 But at end of compilation, do output code for them. */
2554 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2555 assemble_variable (decl
, top_level
, at_end
, 0);
2556 if (decl
== last_assemble_variable_decl
)
2558 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2561 timevar_pop (TV_VARCONST
);
2563 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2565 if (decode_reg_name (asmspec
) >= 0)
2567 SET_DECL_RTL (decl
, NULL_RTX
);
2568 make_decl_rtl (decl
, asmspec
);
2572 error ("invalid register name `%s' for register variable", asmspec
);
2573 DECL_REGISTER (decl
) = 0;
2578 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2579 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2580 && TREE_CODE (decl
) == TYPE_DECL
)
2582 timevar_push (TV_SYMOUT
);
2583 dbxout_symbol (decl
, 0);
2584 timevar_pop (TV_SYMOUT
);
2587 #ifdef SDB_DEBUGGING_INFO
2588 else if (write_symbols
== SDB_DEBUG
&& top_level
2589 && TREE_CODE (decl
) == TYPE_DECL
)
2591 timevar_push (TV_SYMOUT
);
2592 sdbout_symbol (decl
, 0);
2593 timevar_pop (TV_SYMOUT
);
2598 /* Called after finishing a record, union or enumeral type. */
2601 rest_of_type_compilation (type
, toplev
)
2602 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2606 tree type ATTRIBUTE_UNUSED
;
2607 int toplev ATTRIBUTE_UNUSED
;
2610 timevar_push (TV_SYMOUT
);
2611 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2612 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2613 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2615 #ifdef SDB_DEBUGGING_INFO
2616 if (write_symbols
== SDB_DEBUG
)
2617 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2619 #ifdef DWARF2_DEBUGGING_INFO
2620 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2621 dwarf2out_decl (TYPE_STUB_DECL (type
));
2623 timevar_pop (TV_SYMOUT
);
2626 /* DECL is an inline function, whose body is present, but which is not
2627 being output at this point. (We're putting that off until we need
2628 to do it.) If there are any actions that need to take place,
2629 including the emission of debugging information for the function,
2630 this is where they should go. This function may be called by
2631 language-dependent code for front-ends that do not even generate
2632 RTL for functions that don't need to be put out. */
2635 note_deferral_of_defined_inline_function (decl
)
2636 tree decl ATTRIBUTE_UNUSED
;
2638 #ifdef DWARF_DEBUGGING_INFO
2639 /* Generate the DWARF info for the "abstract" instance of a function
2640 which we may later generate inlined and/or out-of-line instances
2642 if (write_symbols
== DWARF_DEBUG
2643 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2644 && ! DECL_ABSTRACT_ORIGIN (decl
))
2646 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2647 DWARF code expects it to be set in this case. Intuitively,
2648 DECL is the function we just finished defining, so setting
2649 CURRENT_FUNCTION_DECL is sensible. */
2650 tree saved_cfd
= current_function_decl
;
2651 int was_abstract
= DECL_ABSTRACT (decl
);
2652 current_function_decl
= decl
;
2654 /* Let the DWARF code do its work. */
2655 set_decl_abstract_flags (decl
, 1);
2656 dwarfout_file_scope_decl (decl
, 0);
2658 set_decl_abstract_flags (decl
, 0);
2660 /* Reset CURRENT_FUNCTION_DECL. */
2661 current_function_decl
= saved_cfd
;
2666 /* FNDECL is an inline function which is about to be emitted out of line.
2667 Do any preparation, such as emitting abstract debug info for the inline
2668 before it gets mangled by optimization. */
2671 note_outlining_of_inline_function (fndecl
)
2672 tree fndecl ATTRIBUTE_UNUSED
;
2674 #ifdef DWARF2_DEBUGGING_INFO
2675 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2676 the abstract description of inline functions until something tries to
2677 reference them. Force it out now, before optimizations mangle the
2679 if (write_symbols
== DWARF2_DEBUG
)
2680 dwarf2out_abstract_function (fndecl
);
2684 /* This is called from finish_function (within yyparse)
2685 after each top-level definition is parsed.
2686 It is supposed to compile that function or variable
2687 and output the assembler code for it.
2688 After we return, the tree storage is freed. */
2691 rest_of_compilation (decl
)
2697 int rebuild_label_notes_after_reload
;
2698 int register_life_up_to_date
;
2700 timevar_push (TV_REST_OF_COMPILATION
);
2702 /* Now that we're out of the frontend, we shouldn't have any more
2703 CONCATs anywhere. */
2704 generating_concat_p
= 0;
2706 /* When processing delayed functions, prepare_function_start() won't
2707 have been run to re-initialize it. */
2708 cse_not_expected
= ! optimize
;
2710 /* First, make sure that NOTE_BLOCK is set correctly for each
2711 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2712 if (!cfun
->x_whole_function_mode_p
)
2715 /* Then remove any notes we don't need. That will make iterating
2716 over the instruction sequence faster, and allow the garbage
2717 collector to reclaim the memory used by the notes. */
2718 remove_unnecessary_notes ();
2720 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2721 tree in sensible shape. So, we just recalculate it here. */
2722 if (cfun
->x_whole_function_mode_p
)
2727 /* If we are reconsidering an inline function
2728 at the end of compilation, skip the stuff for making it inline. */
2730 if (DECL_SAVED_INSNS (decl
) == 0)
2736 /* If this is nested inside an inlined external function, pretend
2737 it was only declared. Since we cannot inline such functions,
2738 generating code for this one is not only not necessary but will
2739 confuse some debugging output writers. */
2740 for (parent
= DECL_CONTEXT (current_function_decl
);
2741 parent
!= NULL_TREE
;
2742 parent
= get_containing_scope (parent
))
2743 if (TREE_CODE (parent
) == FUNCTION_DECL
2744 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2746 DECL_INITIAL (decl
) = 0;
2747 goto exit_rest_of_compilation
;
2750 /* If requested, consider whether to make this function inline. */
2751 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2752 || flag_inline_functions
)
2754 timevar_push (TV_INTEGRATION
);
2755 lose
= function_cannot_inline_p (decl
);
2756 timevar_pop (TV_INTEGRATION
);
2757 if (lose
|| ! optimize
)
2759 if (warn_inline
&& DECL_INLINE (decl
))
2760 warning_with_decl (decl
, lose
);
2761 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2762 /* Don't really compile an extern inline function.
2763 If we can't make it inline, pretend
2764 it was only declared. */
2765 if (DECL_EXTERNAL (decl
))
2767 DECL_INITIAL (decl
) = 0;
2768 goto exit_rest_of_compilation
;
2772 /* ??? Note that this has the effect of making it look
2773 like "inline" was specified for a function if we choose
2774 to inline it. This isn't quite right, but it's
2775 probably not worth the trouble to fix. */
2776 inlinable
= DECL_INLINE (decl
) = 1;
2779 insns
= get_insns ();
2781 /* Dump the rtl code if we are dumping rtl. */
2783 if (open_dump_file (DFI_rtl
, decl
))
2785 if (DECL_SAVED_INSNS (decl
))
2786 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2787 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2790 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2791 sorts of eh initialization. Delay this until after the
2792 initial rtl dump so that we can see the original nesting. */
2793 convert_from_eh_region_ranges ();
2795 /* If function is inline, and we don't yet know whether to
2796 compile it by itself, defer decision till end of compilation.
2797 finish_compilation will call rest_of_compilation again
2798 for those functions that need to be output. Also defer those
2799 functions that we are supposed to defer. */
2802 || (DECL_INLINE (decl
)
2803 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2804 && ! flag_keep_inline_functions
)
2805 || DECL_EXTERNAL (decl
))))
2806 DECL_DEFER_OUTPUT (decl
) = 1;
2808 if (DECL_INLINE (decl
))
2809 /* DWARF wants seperate debugging info for abstract and
2810 concrete instances of all inline functions, including those
2811 declared inline but not inlined, and those inlined even
2812 though they weren't declared inline. Conveniently, that's
2813 what DECL_INLINE means at this point. */
2814 note_deferral_of_defined_inline_function (decl
);
2816 if (DECL_DEFER_OUTPUT (decl
))
2818 /* If -Wreturn-type, we have to do a bit of compilation. We just
2819 want to call jump_optimize to figure out whether or not we can
2820 fall off the end of the function; we do the minimum amount of
2821 work necessary to make that safe. And, we set optimize to zero
2822 to keep jump_optimize from working too hard. */
2823 if (warn_return_type
)
2825 int saved_optimize
= optimize
;
2828 find_exception_handler_labels ();
2829 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2830 !JUMP_AFTER_REGSCAN
);
2831 optimize
= saved_optimize
;
2834 current_function_nothrow
= nothrow_function_p ();
2835 if (current_function_nothrow
)
2836 /* Now we know that this can't throw; set the flag for the benefit
2837 of other functions later in this translation unit. */
2838 TREE_NOTHROW (current_function_decl
) = 1;
2840 timevar_push (TV_INTEGRATION
);
2841 save_for_inline (decl
);
2842 timevar_pop (TV_INTEGRATION
);
2843 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2844 goto exit_rest_of_compilation
;
2847 /* If specified extern inline but we aren't inlining it, we are
2848 done. This goes for anything that gets here with DECL_EXTERNAL
2849 set, not just things with DECL_INLINE. */
2850 if (DECL_EXTERNAL (decl
))
2851 goto exit_rest_of_compilation
;
2856 /* Initialize some variables used by the optimizers. */
2857 init_function_for_compilation ();
2859 if (! DECL_DEFER_OUTPUT (decl
))
2860 TREE_ASM_WRITTEN (decl
) = 1;
2862 /* Now that integrate will no longer see our rtl, we need not
2863 distinguish between the return value of this function and the
2864 return value of called functions. Also, we can remove all SETs
2865 of subregs of hard registers; they are only here because of
2867 rtx_equal_function_value_matters
= 0;
2868 purge_hard_subreg_sets (get_insns ());
2870 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2871 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2872 goto exit_rest_of_compilation
;
2874 /* We may have potential sibling or tail recursion sites. Select one
2875 (of possibly multiple) methods of performing the call. */
2876 if (flag_optimize_sibling_calls
)
2878 timevar_push (TV_JUMP
);
2879 open_dump_file (DFI_sibling
, decl
);
2881 optimize_sibling_and_tail_recursive_calls ();
2883 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2884 timevar_pop (TV_JUMP
);
2887 /* Complete generation of exception handling code. */
2888 find_exception_handler_labels ();
2891 timevar_push (TV_JUMP
);
2892 open_dump_file (DFI_eh
, decl
);
2894 finish_eh_generation ();
2896 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2897 timevar_pop (TV_JUMP
);
2901 /* If we are doing position-independent code generation, now
2902 is the time to output special prologues and epilogues.
2903 We do not want to do this earlier, because it just clutters
2904 up inline functions with meaningless insns. */
2909 insns
= get_insns ();
2911 /* Copy any shared structure that should not be shared. */
2912 unshare_all_rtl (current_function_decl
, insns
);
2914 #ifdef SETJMP_VIA_SAVE_AREA
2915 /* This must be performed before virutal register instantiation. */
2916 if (current_function_calls_alloca
)
2917 optimize_save_area_alloca (insns
);
2920 /* Instantiate all virtual registers. */
2921 instantiate_virtual_regs (current_function_decl
, insns
);
2923 open_dump_file (DFI_jump
, decl
);
2925 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2926 are initialized and to compute whether control can drop off the end
2929 timevar_push (TV_JUMP
);
2930 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2931 before jump optimization switches branch directions. */
2932 expected_value_to_br_prob ();
2934 reg_scan (insns
, max_reg_num (), 0);
2935 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2936 JUMP_AFTER_REGSCAN
);
2938 timevar_pop (TV_JUMP
);
2940 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2941 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2943 close_dump_file (DFI_jump
, print_rtl
, insns
);
2944 goto exit_rest_of_compilation
;
2947 timevar_push (TV_JUMP
);
2951 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2954 /* ??? Run if-conversion before delete_null_pointer_checks,
2955 since the later does not preserve the CFG. This should
2956 be changed -- no since converting if's that are going to
2958 timevar_push (TV_IFCVT
);
2960 timevar_pop (TV_IFCVT
);
2962 /* Try to identify useless null pointer tests and delete them. */
2963 if (flag_delete_null_pointer_checks
)
2964 delete_null_pointer_checks (insns
);
2967 /* Jump optimization, and the removal of NULL pointer checks, may
2968 have reduced the number of instructions substantially. CSE, and
2969 future passes, allocate arrays whose dimensions involve the
2970 maximum instruction UID, so if we can reduce the maximum UID
2971 we'll save big on memory. */
2972 renumber_insns (rtl_dump_file
);
2973 timevar_pop (TV_JUMP
);
2975 close_dump_file (DFI_jump
, print_rtl
, insns
);
2979 /* Perform common subexpression elimination.
2980 Nonzero value from `cse_main' means that jumps were simplified
2981 and some code may now be unreachable, so do
2982 jump optimization again. */
2986 open_dump_file (DFI_cse
, decl
);
2987 timevar_push (TV_CSE
);
2989 reg_scan (insns
, max_reg_num (), 1);
2991 if (flag_thread_jumps
)
2993 timevar_push (TV_JUMP
);
2994 thread_jumps (insns
, max_reg_num (), 1);
2995 timevar_pop (TV_JUMP
);
2998 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3000 /* If we are not running more CSE passes, then we are no longer
3001 expecting CSE to be run. But always rerun it in a cheap mode. */
3002 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3004 if (tem
|| optimize
> 1)
3006 timevar_push (TV_JUMP
);
3007 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3008 !JUMP_AFTER_REGSCAN
);
3009 timevar_pop (TV_JUMP
);
3012 /* Run this after jump optmizations remove all the unreachable code
3013 so that unreachable code will not keep values live. */
3014 delete_trivially_dead_insns (insns
, max_reg_num ());
3016 /* Try to identify useless null pointer tests and delete them. */
3017 if (flag_delete_null_pointer_checks
)
3019 timevar_push (TV_JUMP
);
3020 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3024 delete_null_pointer_checks (insns
);
3025 timevar_pop (TV_JUMP
);
3028 /* The second pass of jump optimization is likely to have
3029 removed a bunch more instructions. */
3030 renumber_insns (rtl_dump_file
);
3032 timevar_pop (TV_CSE
);
3033 close_dump_file (DFI_cse
, print_rtl
, insns
);
3036 open_dump_file (DFI_addressof
, decl
);
3038 purge_addressof (insns
);
3039 reg_scan (insns
, max_reg_num (), 1);
3041 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3045 if (optimize
> 0 && flag_ssa
)
3047 /* Convert to SSA form. */
3049 timevar_push (TV_TO_SSA
);
3050 open_dump_file (DFI_ssa
, decl
);
3052 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3056 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3057 timevar_pop (TV_TO_SSA
);
3059 /* The SSA implementation uses basic block numbers in its phi
3060 nodes. Thus, changing the control-flow graph or the basic
3061 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3062 may cause problems. */
3066 /* Remove dead code. */
3068 timevar_push (TV_DEAD_CODE_ELIM
);
3069 open_dump_file (DFI_dce
, decl
);
3071 insns
= get_insns ();
3072 eliminate_dead_code();
3074 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3075 timevar_pop (TV_DEAD_CODE_ELIM
);
3078 /* Convert from SSA form. */
3080 timevar_push (TV_FROM_SSA
);
3081 open_dump_file (DFI_ussa
, decl
);
3083 convert_from_ssa ();
3084 /* New registers have been created. Rescan their usage. */
3085 reg_scan (insns
, max_reg_num (), 1);
3086 /* Life analysis used in SSA adds log_links but these
3087 shouldn't be there until the flow stage, so clear
3089 clear_log_links (insns
);
3091 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3092 timevar_pop (TV_FROM_SSA
);
3097 /* Perform global cse. */
3099 if (optimize
> 0 && flag_gcse
)
3101 int save_csb
, save_cfj
;
3104 timevar_push (TV_GCSE
);
3105 open_dump_file (DFI_gcse
, decl
);
3107 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3109 tem
= gcse_main (insns
, rtl_dump_file
);
3111 save_csb
= flag_cse_skip_blocks
;
3112 save_cfj
= flag_cse_follow_jumps
;
3113 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3115 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3117 if (flag_expensive_optimizations
)
3119 timevar_push (TV_CSE
);
3120 reg_scan (insns
, max_reg_num (), 1);
3121 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3122 timevar_pop (TV_CSE
);
3123 cse_not_expected
= !flag_rerun_cse_after_loop
;
3126 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3127 things up. Then possibly re-run CSE again. */
3131 timevar_push (TV_JUMP
);
3132 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3133 !JUMP_AFTER_REGSCAN
);
3134 timevar_pop (TV_JUMP
);
3136 if (flag_expensive_optimizations
)
3138 timevar_push (TV_CSE
);
3139 reg_scan (insns
, max_reg_num (), 1);
3140 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3141 timevar_pop (TV_CSE
);
3145 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3146 timevar_pop (TV_GCSE
);
3149 flag_cse_skip_blocks
= save_csb
;
3150 flag_cse_follow_jumps
= save_cfj
;
3153 /* Move constant computations out of loops. */
3157 timevar_push (TV_LOOP
);
3158 open_dump_file (DFI_loop
, decl
);
3160 if (flag_rerun_loop_opt
)
3162 /* We only want to perform unrolling once. */
3164 loop_optimize (insns
, rtl_dump_file
, 0);
3166 /* The first call to loop_optimize makes some instructions
3167 trivially dead. We delete those instructions now in the
3168 hope that doing so will make the heuristics in loop work
3169 better and possibly speed up compilation. */
3170 delete_trivially_dead_insns (insns
, max_reg_num ());
3172 /* The regscan pass is currently necessary as the alias
3173 analysis code depends on this information. */
3174 reg_scan (insns
, max_reg_num (), 1);
3176 loop_optimize (insns
, rtl_dump_file
,
3177 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3179 close_dump_file (DFI_loop
, print_rtl
, insns
);
3180 timevar_pop (TV_LOOP
);
3187 timevar_push (TV_CSE2
);
3188 open_dump_file (DFI_cse2
, decl
);
3190 if (flag_rerun_cse_after_loop
)
3192 /* Running another jump optimization pass before the second
3193 cse pass sometimes simplifies the RTL enough to allow
3194 the second CSE pass to do a better job. Jump_optimize can change
3195 max_reg_num so we must rerun reg_scan afterwards.
3196 ??? Rework to not call reg_scan so often. */
3197 timevar_push (TV_JUMP
);
3199 /* The previous call to loop_optimize makes some instructions
3200 trivially dead. We delete those instructions now in the
3201 hope that doing so will make the heuristics in jump work
3202 better and possibly speed up compilation. */
3203 delete_trivially_dead_insns (insns
, max_reg_num ());
3205 reg_scan (insns
, max_reg_num (), 0);
3206 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3207 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3209 timevar_push (TV_IFCVT
);
3211 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3215 timevar_pop(TV_IFCVT
);
3217 timevar_pop (TV_JUMP
);
3219 reg_scan (insns
, max_reg_num (), 0);
3220 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3224 timevar_push (TV_JUMP
);
3225 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3226 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3227 timevar_pop (TV_JUMP
);
3231 if (flag_thread_jumps
)
3233 /* This pass of jump threading straightens out code
3234 that was kinked by loop optimization. */
3235 timevar_push (TV_JUMP
);
3236 reg_scan (insns
, max_reg_num (), 0);
3237 thread_jumps (insns
, max_reg_num (), 0);
3238 timevar_pop (TV_JUMP
);
3241 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3242 timevar_pop (TV_CSE2
);
3247 cse_not_expected
= 1;
3251 /* Do control and data flow analysis; wrote some of the results to
3254 timevar_push (TV_FLOW
);
3255 open_dump_file (DFI_cfg
, decl
);
3257 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3259 check_function_return_warnings ();
3261 /* It may make more sense to mark constant functions after dead code is
3262 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3263 may insert code making function non-constant, but we still must consider
3264 it as constant, otherwise -fbranch-probabilities will not read data back.
3266 life_analyzis rarely eliminates modification of external memory.
3268 mark_constant_function ();
3270 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3272 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3274 timevar_push (TV_BRANCH_PROB
);
3275 open_dump_file (DFI_bp
, decl
);
3279 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3280 timevar_pop (TV_BRANCH_PROB
);
3283 open_dump_file (DFI_life
, decl
);
3288 /* Discover and record the loop depth at the head of each basic
3289 block. The loop infrastructure does the real job for us. */
3290 flow_loops_find (&loops
, LOOP_TREE
);
3292 /* Estimate using heuristics if no profiling info is available. */
3293 if (flag_guess_branch_prob
)
3294 estimate_probability (&loops
);
3297 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3299 flow_loops_free (&loops
);
3301 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3302 timevar_pop (TV_FLOW
);
3304 register_life_up_to_date
= 1;
3307 if (warn_uninitialized
|| extra_warnings
)
3309 uninitialized_vars_warning (DECL_INITIAL (decl
));
3311 setjmp_args_warning ();
3314 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3318 /* If -opt, try combining insns through substitution. */
3322 int rebuild_jump_labels_after_combine
= 0;
3324 timevar_push (TV_COMBINE
);
3325 open_dump_file (DFI_combine
, decl
);
3327 rebuild_jump_labels_after_combine
3328 = combine_instructions (insns
, max_reg_num ());
3330 /* Combining insns may have turned an indirect jump into a
3331 direct jump. Rebuid the JUMP_LABEL fields of jumping
3333 if (rebuild_jump_labels_after_combine
)
3335 timevar_push (TV_JUMP
);
3336 rebuild_jump_labels (insns
);
3337 timevar_pop (TV_JUMP
);
3339 timevar_push (TV_FLOW
);
3340 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3343 /* Blimey. We've got to have the CFG up to date for the call to
3344 if_convert below. However, the random deletion of blocks
3345 without updating life info can wind up with Wierd Stuff in
3346 global_live_at_end. We then run sched1, which updates things
3347 properly, discovers the wierdness and aborts. */
3348 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3349 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3350 | PROP_SCAN_DEAD_CODE
);
3352 timevar_pop (TV_FLOW
);
3355 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3356 timevar_pop (TV_COMBINE
);
3361 /* Rerun if-conversion, as combine may have simplified things enough to
3362 now meet sequence length restrictions. */
3365 timevar_push (TV_IFCVT
);
3366 open_dump_file (DFI_ce
, decl
);
3372 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3373 timevar_pop (TV_IFCVT
);
3376 /* Register allocation pre-pass, to reduce number of moves
3377 necessary for two-address machines. */
3378 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3380 timevar_push (TV_REGMOVE
);
3381 open_dump_file (DFI_regmove
, decl
);
3383 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3385 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3386 timevar_pop (TV_REGMOVE
);
3391 /* Any of the several passes since flow1 will have munged register
3392 lifetime data a bit. */
3394 register_life_up_to_date
= 0;
3396 #ifdef OPTIMIZE_MODE_SWITCHING
3397 timevar_push (TV_GCSE
);
3399 if (optimize_mode_switching (NULL
))
3401 /* We did work, and so had to regenerate global life information.
3402 Take advantage of this and don't re-recompute register life
3403 information below. */
3404 register_life_up_to_date
= 1;
3407 timevar_pop (TV_GCSE
);
3410 #ifdef INSN_SCHEDULING
3412 /* Print function header into sched dump now
3413 because doing the sched analysis makes some of the dump. */
3414 if (optimize
> 0 && flag_schedule_insns
)
3416 timevar_push (TV_SCHED
);
3417 open_dump_file (DFI_sched
, decl
);
3419 /* Do control and data sched analysis,
3420 and write some of the results to dump file. */
3422 schedule_insns (rtl_dump_file
);
3424 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3425 timevar_pop (TV_SCHED
);
3429 /* Register lifetime information was updated as part of verifying
3431 register_life_up_to_date
= 1;
3435 /* Determine if the current function is a leaf before running reload
3436 since this can impact optimizations done by the prologue and
3437 epilogue thus changing register elimination offsets. */
3438 current_function_is_leaf
= leaf_function_p ();
3440 timevar_push (TV_LOCAL_ALLOC
);
3441 open_dump_file (DFI_lreg
, decl
);
3443 /* Allocate pseudo-regs that are used only within 1 basic block.
3445 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3446 jump optimizer after register allocation and reloading are finished. */
3448 if (! register_life_up_to_date
)
3449 recompute_reg_usage (insns
, ! optimize_size
);
3450 regclass (insns
, max_reg_num (), rtl_dump_file
);
3451 rebuild_label_notes_after_reload
= local_alloc ();
3453 timevar_pop (TV_LOCAL_ALLOC
);
3455 if (dump_file
[DFI_lreg
].enabled
)
3457 timevar_push (TV_DUMP
);
3459 dump_flow_info (rtl_dump_file
);
3460 dump_local_alloc (rtl_dump_file
);
3462 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3463 timevar_pop (TV_DUMP
);
3468 timevar_push (TV_GLOBAL_ALLOC
);
3469 open_dump_file (DFI_greg
, decl
);
3471 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3472 pass fixing up any insns that are invalid. */
3475 failure
= global_alloc (rtl_dump_file
);
3478 build_insn_chain (insns
);
3479 failure
= reload (insns
, 0);
3482 timevar_pop (TV_GLOBAL_ALLOC
);
3484 if (dump_file
[DFI_greg
].enabled
)
3486 timevar_push (TV_DUMP
);
3488 dump_global_regs (rtl_dump_file
);
3490 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3491 timevar_pop (TV_DUMP
);
3495 goto exit_rest_of_compilation
;
3499 open_dump_file (DFI_postreload
, decl
);
3501 /* Do a very simple CSE pass over just the hard registers. */
3504 timevar_push (TV_RELOAD_CSE_REGS
);
3505 reload_cse_regs (insns
);
3506 timevar_pop (TV_RELOAD_CSE_REGS
);
3509 /* If optimizing, then go ahead and split insns now since we are about
3510 to recompute flow information anyway. Since we can't split insns after
3511 reload, do the splitting unconditionally here to avoid gcc from losing
3519 int old_labelnum
= max_label_num ();
3521 split_all_insns (0);
3522 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3525 /* Register allocation and reloading may have turned an indirect jump into
3526 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3527 jumping instructions. */
3528 if (rebuild_label_notes_after_reload
)
3530 timevar_push (TV_JUMP
);
3532 rebuild_jump_labels (insns
);
3534 timevar_pop (TV_JUMP
);
3537 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3539 /* Re-create the death notes which were deleted during reload. */
3540 timevar_push (TV_FLOW2
);
3541 open_dump_file (DFI_flow2
, decl
);
3543 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3544 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3545 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3547 /* On some machines, the prologue and epilogue code, or parts thereof,
3548 can be represented as RTL. Doing so lets us schedule insns between
3549 it and the rest of the code and also allows delayed branch
3550 scheduling to operate in the epilogue. */
3551 thread_prologue_and_epilogue_insns (insns
);
3556 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3558 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3559 even for machines with possibly nonzero RETURN_POPS_ARGS
3560 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3561 push instructions will have popping returns. */
3562 #ifndef PUSH_ROUNDING
3563 if (!ACCUMULATE_OUTGOING_ARGS
)
3565 combine_stack_adjustments ();
3570 flow2_completed
= 1;
3572 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3573 timevar_pop (TV_FLOW2
);
3575 #ifdef HAVE_peephole2
3576 if (optimize
> 0 && flag_peephole2
)
3578 timevar_push (TV_PEEPHOLE2
);
3579 open_dump_file (DFI_peephole2
, decl
);
3581 peephole2_optimize (rtl_dump_file
);
3583 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3584 timevar_pop (TV_PEEPHOLE2
);
3588 if (optimize
> 0 && flag_rename_registers
)
3590 timevar_push (TV_RENAME_REGISTERS
);
3591 open_dump_file (DFI_rnreg
, decl
);
3593 regrename_optimize ();
3595 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3596 timevar_pop (TV_RENAME_REGISTERS
);
3601 timevar_push (TV_IFCVT2
);
3602 open_dump_file (DFI_ce2
, decl
);
3606 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3607 timevar_pop (TV_IFCVT2
);
3610 #ifdef INSN_SCHEDULING
3611 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3613 timevar_push (TV_SCHED2
);
3614 open_dump_file (DFI_sched2
, decl
);
3616 /* Do control and data sched analysis again,
3617 and write some more of the results to dump file. */
3619 schedule_insns (rtl_dump_file
);
3621 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3622 timevar_pop (TV_SCHED2
);
3628 #ifdef LEAF_REGISTERS
3629 current_function_uses_only_leaf_regs
3630 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3633 if (optimize
> 0 && flag_reorder_blocks
)
3635 timevar_push (TV_REORDER_BLOCKS
);
3636 open_dump_file (DFI_bbro
, decl
);
3638 reorder_basic_blocks ();
3640 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3641 timevar_pop (TV_REORDER_BLOCKS
);
3644 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3645 Also do cross-jumping this time and delete no-op move insns. */
3649 timevar_push (TV_JUMP
);
3650 open_dump_file (DFI_jump2
, decl
);
3652 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3653 !JUMP_AFTER_REGSCAN
);
3655 /* CFG no longer kept up to date. */
3657 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3658 timevar_pop (TV_JUMP
);
3661 /* If a machine dependent reorganization is needed, call it. */
3662 #ifdef MACHINE_DEPENDENT_REORG
3663 open_dump_file (DFI_mach
, decl
);
3665 MACHINE_DEPENDENT_REORG (insns
);
3667 close_dump_file (DFI_mach
, print_rtl
, insns
);
3672 /* If a scheduling pass for delayed branches is to be done,
3673 call the scheduling code. */
3676 if (optimize
> 0 && flag_delayed_branch
)
3678 timevar_push (TV_DBR_SCHED
);
3679 open_dump_file (DFI_dbr
, decl
);
3681 dbr_schedule (insns
, rtl_dump_file
);
3683 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3684 timevar_pop (TV_DBR_SCHED
);
3690 timevar_push (TV_SHORTEN_BRANCH
);
3692 #ifdef HAVE_ATTR_length
3699 split_all_insns (0);
3700 timevar_pop (TV_SHORTEN_BRANCH
);
3703 timevar_push (TV_REG_STACK
);
3704 open_dump_file (DFI_stack
, decl
);
3706 reg_to_stack (insns
, rtl_dump_file
);
3708 close_dump_file (DFI_stack
, print_rtl
, insns
);
3709 timevar_pop (TV_REG_STACK
);
3714 convert_to_eh_region_ranges ();
3716 /* Shorten branches. */
3717 timevar_push (TV_SHORTEN_BRANCH
);
3718 shorten_branches (get_insns ());
3719 timevar_pop (TV_SHORTEN_BRANCH
);
3721 current_function_nothrow
= nothrow_function_p ();
3722 if (current_function_nothrow
)
3723 /* Now we know that this can't throw; set the flag for the benefit
3724 of other functions later in this translation unit. */
3725 TREE_NOTHROW (current_function_decl
) = 1;
3727 /* Now turn the rtl into assembler code. */
3729 timevar_push (TV_FINAL
);
3734 /* Get the function's name, as described by its RTL. This may be
3735 different from the DECL_NAME name used in the source file. */
3737 x
= DECL_RTL (decl
);
3738 if (GET_CODE (x
) != MEM
)
3741 if (GET_CODE (x
) != SYMBOL_REF
)
3743 fnname
= XSTR (x
, 0);
3745 assemble_start_function (decl
, fnname
);
3746 final_start_function (insns
, asm_out_file
, optimize
);
3747 final (insns
, asm_out_file
, optimize
, 0);
3748 final_end_function (insns
, asm_out_file
, optimize
);
3750 #ifdef IA64_UNWIND_INFO
3751 /* ??? The IA-64 ".handlerdata" directive must be issued before
3752 the ".endp" directive that closes the procedure descriptor. */
3753 output_function_exception_table ();
3756 assemble_end_function (decl
, fnname
);
3758 #ifndef IA64_UNWIND_INFO
3759 /* Otherwise, it feels unclean to switch sections in the middle. */
3760 output_function_exception_table ();
3764 fflush (asm_out_file
);
3766 /* Release all memory allocated by flow. */
3767 free_basic_block_vars (0);
3769 /* Release all memory held by regsets now. */
3770 regset_release_memory ();
3772 timevar_pop (TV_FINAL
);
3776 /* Write DBX symbols if requested. */
3778 /* Note that for those inline functions where we don't initially
3779 know for certain that we will be generating an out-of-line copy,
3780 the first invocation of this routine (rest_of_compilation) will
3781 skip over this code by doing a `goto exit_rest_of_compilation;'.
3782 Later on, finish_compilation will call rest_of_compilation again
3783 for those inline functions that need to have out-of-line copies
3784 generated. During that call, we *will* be routed past here. */
3786 timevar_push (TV_SYMOUT
);
3787 #ifdef DBX_DEBUGGING_INFO
3788 if (write_symbols
== DBX_DEBUG
)
3789 dbxout_function (decl
);
3792 #ifdef DWARF_DEBUGGING_INFO
3793 if (write_symbols
== DWARF_DEBUG
)
3794 dwarfout_file_scope_decl (decl
, 0);
3797 #ifdef DWARF2_DEBUGGING_INFO
3798 if (write_symbols
== DWARF2_DEBUG
)
3799 dwarf2out_decl (decl
);
3801 timevar_pop (TV_SYMOUT
);
3803 exit_rest_of_compilation
:
3805 /* In case the function was not output,
3806 don't leave any temporary anonymous types
3807 queued up for sdb output. */
3808 #ifdef SDB_DEBUGGING_INFO
3809 if (write_symbols
== SDB_DEBUG
)
3810 sdbout_types (NULL_TREE
);
3813 reload_completed
= 0;
3814 flow2_completed
= 0;
3817 timevar_push (TV_FINAL
);
3819 /* Clear out the insn_length contents now that they are no
3821 init_insn_lengths ();
3823 /* Clear out the real_constant_chain before some of the rtx's
3824 it runs through become garbage. */
3825 clear_const_double_mem ();
3827 /* Show no temporary slots allocated. */
3830 free_basic_block_vars (0);
3832 timevar_pop (TV_FINAL
);
3834 /* Make sure volatile mem refs aren't considered valid operands for
3835 arithmetic insns. We must call this here if this is a nested inline
3836 function, since the above code leaves us in the init_recog state
3837 (from final.c), and the function context push/pop code does not
3838 save/restore volatile_ok.
3840 ??? Maybe it isn't necessary for expand_start_function to call this
3841 anymore if we do it here? */
3843 init_recog_no_volatile ();
3845 /* We're done with this function. Free up memory if we can. */
3846 free_after_parsing (cfun
);
3847 if (! DECL_DEFER_OUTPUT (decl
))
3848 free_after_compilation (cfun
);
3853 timevar_pop (TV_REST_OF_COMPILATION
);
3863 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3864 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3865 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3866 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3867 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3868 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"));
3870 for (i
= ARRAY_SIZE (f_options
); i
--;)
3872 const char *description
= f_options
[i
].description
;
3874 if (description
!= NULL
&& * description
!= 0)
3875 printf (" -f%-21s %s\n",
3876 f_options
[i
].string
, _(description
));
3879 printf (_(" -O[number] Set optimisation level to [number]\n"));
3880 printf (_(" -Os Optimise for space rather than speed\n"));
3881 for (i
= sizeof (compiler_params
); i
--;)
3883 const char *description
= compiler_params
[i
].help
;
3884 const int length
= 21-strlen(compiler_params
[i
].option
);
3886 if (description
!= NULL
&& * description
!= 0)
3887 printf (" --param %s=<value>%.*s%s\n",
3888 compiler_params
[i
].option
,
3889 length
> 0 ? length
: 1, " ",
3892 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3893 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3894 printf (_(" -w Suppress warnings\n"));
3895 printf (_(" -W Enable extra warnings\n"));
3897 for (i
= ARRAY_SIZE (W_options
); i
--;)
3899 const char *description
= W_options
[i
].description
;
3901 if (description
!= NULL
&& * description
!= 0)
3902 printf (" -W%-21s %s\n",
3903 W_options
[i
].string
, _(description
));
3906 printf (_(" -Wunused Enable unused warnings\n"));
3907 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3908 printf (_(" -p Enable function profiling\n"));
3909 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3910 printf (_(" -a Enable block profiling \n"));
3912 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3913 printf (_(" -ax Enable jump profiling \n"));
3915 printf (_(" -o <file> Place output into <file> \n"));
3917 -G <number> Put global and static data smaller than <number>\n\
3918 bytes into a special section (on some targets)\n"));
3920 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3922 if (debug_args
[i
].description
!= NULL
)
3923 printf (" -g%-21s %s\n",
3924 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3927 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3928 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3929 printf (_(" -version Display the compiler's version\n"));
3930 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3931 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3932 #if defined INSN_SCHEDULING
3933 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3935 printf (_(" --help Display this information\n"));
3940 /* Display descriptions of language specific options.
3941 If there is no description, note that there is an undocumented option.
3942 If the description is empty, do not display anything. (This allows
3943 options to be deliberately undocumented, for whatever reason).
3944 If the option string is missing, then this is a marker, indicating
3945 that the description string is in fact the name of a language, whose
3946 language specific options are to follow. */
3948 if (ARRAY_SIZE (documented_lang_options
) > 1)
3950 printf (_("\nLanguage specific options:\n"));
3952 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3954 const char *description
= documented_lang_options
[i
].description
;
3955 const char *option
= documented_lang_options
[i
].option
;
3957 if (description
== NULL
)
3962 printf (_(" %-23.23s [undocumented]\n"), option
);
3964 else if (*description
== 0)
3966 else if (option
== NULL
)
3970 (_("\nThere are undocumented %s specific options as well.\n"),
3974 printf (_("\n Options for %s:\n"), description
);
3979 printf (" %-23.23s %s\n", option
, _(description
));
3984 printf (_("\nThere are undocumented %s specific options as well.\n"),
3987 display_target_options ();
3991 display_target_options ()
3995 if (ARRAY_SIZE (target_switches
) > 1
3996 #ifdef TARGET_OPTIONS
3997 || ARRAY_SIZE (target_options
) > 1
4005 printf (_("\nTarget specific options:\n"));
4007 for (i
= ARRAY_SIZE (target_switches
); i
--;)
4009 const char *option
= target_switches
[i
].name
;
4010 const char *description
= target_switches
[i
].description
;
4012 if (option
== NULL
|| *option
== 0)
4014 else if (description
== NULL
)
4019 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4021 else if (* description
!= 0)
4022 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4025 #ifdef TARGET_OPTIONS
4026 for (i
= ARRAY_SIZE (target_options
); i
--;)
4028 const char *option
= target_options
[i
].prefix
;
4029 const char *description
= target_options
[i
].description
;
4031 if (option
== NULL
|| *option
== 0)
4033 else if (description
== NULL
)
4038 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4040 else if (* description
!= 0)
4041 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4047 printf (_("\nThere are undocumented target specific options as well.\n"));
4049 printf (_(" They exist, but they are not documented.\n"));
4054 /* Parse a -d... comand line switch. */
4057 decode_d_option (arg
)
4066 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4067 dump_file
[i
].enabled
= 1;
4073 flag_print_asm_name
= 1;
4076 flag_dump_rtl_in_asm
= 1;
4077 flag_print_asm_name
= 1;
4080 graph_dump_format
= vcg
;
4083 rtl_dump_and_exit
= 1;
4088 case 'D': /* These are handled by the preprocessor. */
4094 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4095 if (c
== dump_file
[i
].debug_switch
)
4097 dump_file
[i
].enabled
= 1;
4102 warning ("unrecognized gcc debugging option: %c", c
);
4107 /* Parse a -f... comand line switch. ARG is the value after the -f.
4108 It is safe to access 'ARG - 2' to generate the full switch name.
4109 Return the number of strings consumed. */
4112 decode_f_option (arg
)
4116 const char *option_value
= NULL
;
4118 /* Search for the option in the table of binary f options. */
4119 for (j
= ARRAY_SIZE (f_options
); j
--;)
4121 if (!strcmp (arg
, f_options
[j
].string
))
4123 *f_options
[j
].variable
= f_options
[j
].on_value
;
4127 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4128 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4130 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4135 if (!strcmp (arg
, "fast-math"))
4136 set_fast_math_flags();
4137 else if (!strcmp (arg
, "no-fast-math"))
4138 set_no_fast_math_flags();
4139 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4140 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4143 read_integral_parameter (option_value
, arg
- 2,
4145 set_param_value ("max-inline-insns", val
);
4147 #ifdef INSN_SCHEDULING
4148 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4149 fix_sched_param ("verbose", option_value
);
4151 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4152 fix_register (option_value
, 1, 1);
4153 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4154 fix_register (option_value
, 0, 1);
4155 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4156 fix_register (option_value
, 0, 0);
4157 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4158 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4159 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4161 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4162 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4163 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4164 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4166 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4167 else if ((option_value
4168 = skip_leading_substring (arg
, "stack-limit-register=")))
4170 int reg
= decode_reg_name (option_value
);
4172 error ("unrecognized register name `%s'", option_value
);
4174 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4176 else if ((option_value
4177 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4180 nm
= ggc_strdup (option_value
);
4181 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4183 else if ((option_value
4184 = skip_leading_substring (arg
, "message-length=")))
4185 diagnostic_message_length_per_line
=
4186 read_integral_parameter (option_value
, arg
- 2,
4187 diagnostic_message_length_per_line
);
4188 else if ((option_value
4189 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4191 if (!strcmp (option_value
, "once"))
4192 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4193 else if (!strcmp (option_value
, "every-line"))
4194 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4196 error ("Unrecognized option `%s'", arg
- 2);
4198 else if (!strcmp (arg
, "no-stack-limit"))
4199 stack_limit_rtx
= NULL_RTX
;
4200 else if (!strcmp (arg
, "preprocessed"))
4201 /* Recognise this switch but do nothing. This prevents warnings
4202 about an unrecognized switch if cpplib has not been linked in. */
4210 /* Parse a -W... comand line switch. ARG is the value after the -W.
4211 It is safe to access 'ARG - 2' to generate the full switch name.
4212 Return the number of strings consumed. */
4215 decode_W_option (arg
)
4218 const char *option_value
= NULL
;
4221 /* Search for the option in the table of binary W options. */
4223 for (j
= ARRAY_SIZE (W_options
); j
--;)
4225 if (!strcmp (arg
, W_options
[j
].string
))
4227 *W_options
[j
].variable
= W_options
[j
].on_value
;
4231 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4232 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4234 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4239 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4240 warning ("-Wid-clash-LEN is no longer supported");
4241 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4243 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4245 warn_larger_than
= larger_than_size
!= -1;
4247 else if (!strcmp (arg
, "unused"))
4251 else if (!strcmp (arg
, "no-unused"))
4261 /* Parse a -g... comand line switch. ARG is the value after the -g.
4262 It is safe to access 'ARG - 2' to generate the full switch name.
4263 Return the number of strings consumed. */
4266 decode_g_option (arg
)
4270 /* A lot of code assumes write_symbols == NO_DEBUG if the
4271 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4272 of what debugging type has been selected). This records the
4273 selected type. It is an error to specify more than one
4275 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4276 /* Non-zero if debugging format has been explicitly set.
4277 -g and -ggdb don't explicitly set the debugging format so
4278 -gdwarf -g3 is equivalent to -gdwarf3. */
4279 static int type_explicitly_set_p
= 0;
4280 /* Indexed by enum debug_info_type. */
4281 static const char *debug_type_names
[] =
4283 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4286 /* The maximum admissible debug level value. */
4287 static const unsigned max_debug_level
= 3;
4289 /* Look up ARG in the table. */
4290 for (da
= debug_args
; da
->arg
; da
++)
4292 const int da_len
= strlen (da
->arg
);
4294 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4296 enum debug_info_type type
= da
->debug_type
;
4297 const char *p
= arg
+ da_len
;
4299 if (*p
&& (*p
< '0' || *p
> '9'))
4302 /* A debug flag without a level defaults to level 2.
4303 Note we do not want to call read_integral_parameter
4304 for that case since it will call atoi which
4307 ??? We may want to generalize the interface to
4308 read_integral_parameter to better handle this case
4309 if this case shows up often. */
4311 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4315 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4317 error ("use -gdwarf -g%d for DWARF v1, level %d",
4320 error ("use -gdwarf-2 for DWARF v2");
4323 if (level
> max_debug_level
)
4326 ignoring option `%s' due to invalid debug level specification",
4328 level
= debug_info_level
;
4331 if (type
== NO_DEBUG
)
4333 type
= PREFERRED_DEBUGGING_TYPE
;
4335 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4337 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4338 type
= DWARF2_DEBUG
;
4340 #ifdef DBX_DEBUGGING_INFO
4347 if (type
== NO_DEBUG
)
4348 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4350 /* Does it conflict with an already selected type? */
4351 if (type_explicitly_set_p
4352 /* -g/-ggdb don't conflict with anything. */
4353 && da
->debug_type
!= NO_DEBUG
4354 && type
!= selected_debug_type
)
4355 warning ("`%s' ignored, conflicts with `-g%s'",
4356 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4359 /* If the format has already been set, -g/-ggdb
4360 only change the debug level. */
4361 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4362 /* Don't change debugging type. */
4366 selected_debug_type
= type
;
4367 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4370 write_symbols
= (level
== 0
4372 : selected_debug_type
);
4373 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4374 debug_info_level
= (enum debug_info_level
) level
;
4387 /* Decode the first argument in the argv as a language-independent option.
4388 Return the number of strings consumed. */
4391 independent_decode_option (argc
, argv
)
4395 char *arg
= argv
[0];
4397 if (arg
[0] != '-' || arg
[1] == 0)
4409 if (!strcmp (arg
, "-help"))
4412 exit_after_options
= 1;
4415 if (!strcmp (arg
, "-target-help"))
4417 display_target_options ();
4418 exit_after_options
= 1;
4421 if (!strcmp (arg
, "-version"))
4423 print_version (stderr
, "");
4424 exit_after_options
= 1;
4427 /* Handle '--param <name>=<value>'. */
4428 if (strcmp (arg
, "-param") == 0)
4434 error ("-param option missing argument");
4438 /* Get the '<name>=<value>' parameter. */
4440 /* Look for the `='. */
4441 equal
= strchr (arg
, '=');
4443 error ("invalid --param option: %s", arg
);
4448 /* Zero out the `=' sign so that we get two separate strings. */
4450 /* Figure out what value is specified. */
4451 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4452 if (val
!= INVALID_PARAM_VAL
)
4453 set_param_value (arg
, val
);
4455 error ("invalid parameter value `%s'", equal
+ 1);
4470 /* Already been treated in main (). Do nothing. */
4474 set_target_switch (arg
+ 1);
4478 return decode_f_option (arg
+ 1);
4481 return decode_g_option (arg
+ 1);
4484 if (!strcmp (arg
, "dumpbase"))
4489 dump_base_name
= argv
[1];
4493 decode_d_option (arg
+ 1);
4497 if (!strcmp (arg
, "pedantic"))
4499 else if (!strcmp (arg
, "pedantic-errors"))
4500 flag_pedantic_errors
= pedantic
= 1;
4501 else if (arg
[1] == 0)
4508 if (!strcmp (arg
, "quiet"))
4515 if (!strcmp (arg
, "version"))
4523 inhibit_warnings
= 1;
4532 /* We save the value of warn_uninitialized, since if they put
4533 -Wuninitialized on the command line, we need to generate a
4534 warning about not using it without also specifying -O. */
4535 if (warn_uninitialized
!= 1)
4536 warn_uninitialized
= 2;
4539 return decode_W_option (arg
+ 1);
4545 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4546 warning ("`-a' option (basic block profile) not supported");
4548 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4551 else if (!strcmp (arg
, "ax"))
4553 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4554 warning ("`-ax' option (jump profiling) not supported");
4556 profile_block_flag
= (!profile_block_flag
4557 || profile_block_flag
== 2) ? 2 : 3;
4560 else if (!strncmp (arg
, "aux-info", 8))
4567 aux_info_file_name
= argv
[1];
4568 flag_gen_aux_info
= 1;
4571 else if (arg
[8] == '=')
4573 aux_info_file_name
= arg
+ 9;
4574 flag_gen_aux_info
= 1;
4589 asm_file_name
= argv
[1];
4604 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4609 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4613 if (g_switch_val
== -1)
4617 g_switch_set
= TRUE
;
4618 g_switch_value
= g_switch_val
;
4628 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4629 Decode command args, then call compile_file.
4630 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4631 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4633 It is not safe to call this function more than once. */
4636 toplev_main (argc
, argv
)
4643 /* save in case md file wants to emit args as a comment. */
4647 p
= argv
[0] + strlen (argv
[0]);
4648 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4652 xmalloc_set_program_name (progname
);
4654 /* LC_CTYPE determines the character set used by the terminal so it has be set
4655 to output messages correctly. */
4657 #ifdef HAVE_LC_MESSAGES
4658 setlocale (LC_CTYPE
, "");
4659 setlocale (LC_MESSAGES
, "");
4661 setlocale (LC_ALL
, "");
4664 (void) bindtextdomain (PACKAGE
, localedir
);
4665 (void) textdomain (PACKAGE
);
4667 /* Install handler for SIGFPE, which may be received while we do
4668 compile-time floating point arithmetic. */
4669 signal (SIGFPE
, float_signal
);
4671 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4673 signal (SIGSEGV
, crash_signal
);
4676 signal (SIGILL
, crash_signal
);
4679 signal (SIGBUS
, crash_signal
);
4682 signal (SIGABRT
, crash_signal
);
4684 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4685 signal (SIGIOT
, crash_signal
);
4688 decl_printable_name
= decl_name
;
4689 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4691 /* Initialize whether `char' is signed. */
4692 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4693 #ifdef DEFAULT_SHORT_ENUMS
4694 /* Initialize how much space enums occupy, by default. */
4695 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4698 /* Initialize the garbage-collector. */
4701 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4702 ggc_add_tree_root (¤t_function_decl
, 1);
4703 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4705 /* Initialize the diagnostics reporting machinery. */
4706 initialize_diagnostics ();
4708 /* Register the language-independent parameters. */
4709 add_params (lang_independent_params
, LAST_PARAM
);
4711 /* Perform language-specific options intialization. */
4712 if (lang_hooks
.init_options
)
4713 (*lang_hooks
.init_options
) ();
4715 /* Scan to see what optimization level has been specified. That will
4716 determine the default value of many flags. */
4717 for (i
= 1; i
< argc
; i
++)
4719 if (!strcmp (argv
[i
], "-O"))
4724 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4726 /* Handle -Os, -O2, -O3, -O69, ... */
4727 char *p
= &argv
[i
][2];
4729 if ((p
[0] == 's') && (p
[1] == 0))
4733 /* Optimizing for size forces optimize to be 2. */
4738 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4739 if (optimize_val
!= -1)
4741 optimize
= optimize_val
;
4751 flag_thread_jumps
= 1;
4753 flag_delayed_branch
= 1;
4755 #ifdef CAN_DEBUG_WITHOUT_FP
4756 flag_omit_frame_pointer
= 1;
4758 flag_guess_branch_prob
= 1;
4763 flag_optimize_sibling_calls
= 1;
4764 flag_cse_follow_jumps
= 1;
4765 flag_cse_skip_blocks
= 1;
4767 flag_expensive_optimizations
= 1;
4768 flag_strength_reduce
= 1;
4769 flag_rerun_cse_after_loop
= 1;
4770 flag_rerun_loop_opt
= 1;
4771 flag_caller_saves
= 1;
4774 #ifdef INSN_SCHEDULING
4775 flag_schedule_insns
= 1;
4776 flag_schedule_insns_after_reload
= 1;
4779 flag_strict_aliasing
= 1;
4780 flag_delete_null_pointer_checks
= 1;
4781 flag_reorder_blocks
= 1;
4786 flag_inline_functions
= 1;
4787 flag_rename_registers
= 1;
4790 if (optimize
< 2 || optimize_size
)
4795 align_functions
= 1;
4798 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4801 set_target_switch ("");
4803 /* Unwind tables are always present in an ABI-conformant IA-64
4804 object file, so the default should be ON. */
4805 #ifdef IA64_UNWIND_INFO
4806 flag_unwind_tables
= IA64_UNWIND_INFO
;
4809 #ifdef OPTIMIZATION_OPTIONS
4810 /* Allow default optimizations to be specified on a per-machine basis. */
4811 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4814 /* Initialize register usage now so switches may override. */
4817 /* Perform normal command line switch decoding. */
4818 for (i
= 1; i
< argc
;)
4821 int indep_processed
;
4823 /* Give the language a chance to decode the option for itself. */
4824 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4826 if (lang_processed
>= 0)
4827 /* Now see if the option also has a language independent meaning.
4828 Some options are both language specific and language independent,
4830 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4833 lang_processed
= -lang_processed
;
4834 indep_processed
= 0;
4837 if (lang_processed
|| indep_processed
)
4838 i
+= MAX (lang_processed
, indep_processed
);
4841 const char *option
= NULL
;
4842 const char *lang
= NULL
;
4845 /* It is possible that the command line switch is not valid for the
4846 current language, but it is valid for another language. In order
4847 to be compatible with previous versions of the compiler (which
4848 did not issue an error message in this case) we check for this
4849 possibility here. If we do find a match, then if extra_warnings
4850 is set we generate a warning message, otherwise we will just
4851 ignore the option. */
4852 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4854 option
= documented_lang_options
[j
].option
;
4857 lang
= documented_lang_options
[j
].description
;
4858 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4862 if (j
!= ARRAY_SIZE (documented_lang_options
))
4866 warning ("Ignoring command line option '%s'", argv
[i
]);
4869 ("(It is valid for %s but not the selected language)",
4873 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4874 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4876 error ("Unrecognized option `%s'", argv
[i
]);
4882 /* All command line options have been processed. */
4883 if (lang_hooks
.post_options
)
4884 (*lang_hooks
.post_options
) ();
4886 if (exit_after_options
)
4889 /* Reflect any language-specific diagnostic option setting. */
4890 reshape_diagnostic_buffer ();
4892 /* Checker uses the frame pointer. */
4893 if (flag_check_memory_usage
)
4894 flag_omit_frame_pointer
= 0;
4898 /* Inlining does not work if not optimizing,
4899 so force it not to be done. */
4903 /* The c_decode_option function and decode_option hook set
4904 this to `2' if -Wall is used, so we can avoid giving out
4905 lots of errors for people who don't realize what -Wall does. */
4906 if (warn_uninitialized
== 1)
4907 warning ("-Wuninitialized is not supported without -O");
4910 /* We do not currently support sibling-call optimization in the
4911 presence of exceptions. See PR2975 for a test-case that will
4912 fail if we try to combine both of these features. */
4913 if (flag_exceptions
)
4914 flag_optimize_sibling_calls
= 0;
4916 #ifdef OVERRIDE_OPTIONS
4917 /* Some machines may reject certain combinations of options. */
4921 /* Set up the align_*_log variables, defaulting them to 1 if they
4922 were still unset. */
4923 if (align_loops
<= 0) align_loops
= 1;
4924 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4925 if (align_jumps
<= 0) align_jumps
= 1;
4926 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4927 if (align_labels
<= 0) align_labels
= 1;
4928 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4929 if (align_functions
<= 0) align_functions
= 1;
4930 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4932 if (profile_block_flag
== 3)
4934 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4935 profile_block_flag
= 2;
4938 /* Unrolling all loops implies that standard loop unrolling must also
4940 if (flag_unroll_all_loops
)
4941 flag_unroll_loops
= 1;
4942 /* Loop unrolling requires that strength_reduction be on also. Silently
4943 turn on strength reduction here if it isn't already on. Also, the loop
4944 unrolling code assumes that cse will be run after loop, so that must
4945 be turned on also. */
4946 if (flag_unroll_loops
)
4948 flag_strength_reduce
= 1;
4949 flag_rerun_cse_after_loop
= 1;
4952 /* Warn about options that are not supported on this machine. */
4953 #ifndef INSN_SCHEDULING
4954 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4955 warning ("instruction scheduling not supported on this target machine");
4958 if (flag_delayed_branch
)
4959 warning ("this target machine does not have delayed branches");
4962 /* Some operating systems do not allow profiling without a frame
4964 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4966 && flag_omit_frame_pointer
)
4968 error ("profiling does not work without a frame pointer");
4969 flag_omit_frame_pointer
= 0;
4972 user_label_prefix
= USER_LABEL_PREFIX
;
4973 if (flag_leading_underscore
!= -1)
4975 /* If the default prefix is more complicated than "" or "_",
4976 issue a warning and ignore this option. */
4977 if (user_label_prefix
[0] == 0 ||
4978 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4980 user_label_prefix
= flag_leading_underscore
? "_" : "";
4983 warning ("-f%sleading-underscore not supported on this target machine",
4984 flag_leading_underscore
? "" : "no-");
4987 /* If we are in verbose mode, write out the version and maybe all the
4988 option flags in use. */
4991 print_version (stderr
, "");
4993 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4996 compile_file (filename
);
4999 return (FATAL_EXIT_CODE
);
5001 return (FATAL_EXIT_CODE
);
5002 return (SUCCESS_EXIT_CODE
);
5005 /* Decode -m switches. */
5006 /* Decode the switch -mNAME. */
5009 set_target_switch (name
)
5013 int valid_target_option
= 0;
5015 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5016 if (!strcmp (target_switches
[j
].name
, name
))
5018 if (target_switches
[j
].value
< 0)
5019 target_flags
&= ~-target_switches
[j
].value
;
5021 target_flags
|= target_switches
[j
].value
;
5022 valid_target_option
= 1;
5025 #ifdef TARGET_OPTIONS
5026 if (!valid_target_option
)
5027 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5029 int len
= strlen (target_options
[j
].prefix
);
5030 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5032 *target_options
[j
].variable
= name
+ len
;
5033 valid_target_option
= 1;
5038 if (!valid_target_option
)
5039 error ("Invalid option `%s'", name
);
5042 /* Print version information to FILE.
5043 Each line begins with INDENT (for the case where FILE is the
5044 assembler output file). */
5047 print_version (file
, indent
)
5052 #define __VERSION__ "[?]"
5056 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5058 "%s%s%s version %s (%s) compiled by CC.\n"
5060 , indent
, *indent
!= 0 ? " " : "",
5061 language_string
, version_string
, TARGET_NAME
,
5062 indent
, __VERSION__
);
5065 /* Print an option value and return the adjusted position in the line.
5066 ??? We don't handle error returns from fprintf (disk full); presumably
5067 other code will catch a disk full though. */
5070 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5073 const char *indent
, *sep
, *term
, *type
, *name
;
5075 /* The ultrix fprintf returns 0 on success, so compute the result we want
5076 here since we need it for the following test. */
5077 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5082 fprintf (file
, "%s", term
);
5087 fprintf (file
, "%s", indent
);
5088 pos
= strlen (indent
);
5090 fprintf (file
, "%s%s%s", sep
, type
, name
);
5095 /* Print active target switches to FILE.
5096 POS is the current cursor position and MAX is the size of a "line".
5097 Each line begins with INDENT and ends with TERM.
5098 Each switch is separated from the next by SEP. */
5101 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5104 const char *indent
, *sep
, *term
;
5109 /* Print the options as passed. */
5111 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5112 _("options passed: "), "");
5114 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5118 if (strcmp (*p
, "-o") == 0)
5124 if (strcmp (*p
, "-quiet") == 0)
5126 if (strcmp (*p
, "-version") == 0)
5131 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5134 fprintf (file
, "%s", term
);
5136 /* Print the -f and -m options that have been enabled.
5137 We don't handle language specific options but printing argv
5140 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5141 _("options enabled: "), "");
5143 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5144 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5145 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5146 "-f", f_options
[j
].string
);
5148 /* Print target specific options. */
5150 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5151 if (target_switches
[j
].name
[0] != '\0'
5152 && target_switches
[j
].value
> 0
5153 && ((target_switches
[j
].value
& target_flags
)
5154 == target_switches
[j
].value
))
5156 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5157 "-m", target_switches
[j
].name
);
5160 #ifdef TARGET_OPTIONS
5161 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5162 if (*target_options
[j
].variable
!= NULL
)
5165 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5166 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5167 prefix
, *target_options
[j
].variable
);
5171 fprintf (file
, "%s", term
);
5174 /* Record the beginning of a new source file, named FILENAME. */
5177 debug_start_source_file (filename
)
5178 register const char *filename ATTRIBUTE_UNUSED
;
5180 #ifdef DBX_DEBUGGING_INFO
5181 if (write_symbols
== DBX_DEBUG
)
5182 dbxout_start_new_source_file (filename
);
5184 #ifdef DWARF_DEBUGGING_INFO
5185 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5186 && write_symbols
== DWARF_DEBUG
)
5187 dwarfout_start_new_source_file (filename
);
5188 #endif /* DWARF_DEBUGGING_INFO */
5189 #ifdef DWARF2_DEBUGGING_INFO
5190 if (write_symbols
== DWARF2_DEBUG
)
5191 dwarf2out_start_source_file (filename
);
5192 #endif /* DWARF2_DEBUGGING_INFO */
5193 #ifdef SDB_DEBUGGING_INFO
5194 if (write_symbols
== SDB_DEBUG
)
5195 sdbout_start_new_source_file (filename
);
5199 /* Record the resumption of a source file. LINENO is the line number in
5200 the source file we are returning to. */
5203 debug_end_source_file (lineno
)
5204 register unsigned lineno ATTRIBUTE_UNUSED
;
5206 #ifdef DBX_DEBUGGING_INFO
5207 if (write_symbols
== DBX_DEBUG
)
5208 dbxout_resume_previous_source_file ();
5210 #ifdef DWARF_DEBUGGING_INFO
5211 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5212 && write_symbols
== DWARF_DEBUG
)
5213 dwarfout_resume_previous_source_file (lineno
);
5214 #endif /* DWARF_DEBUGGING_INFO */
5215 #ifdef DWARF2_DEBUGGING_INFO
5216 if (write_symbols
== DWARF2_DEBUG
)
5217 dwarf2out_end_source_file ();
5218 #endif /* DWARF2_DEBUGGING_INFO */
5219 #ifdef SDB_DEBUGGING_INFO
5220 if (write_symbols
== SDB_DEBUG
)
5221 sdbout_resume_previous_source_file ();
5225 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5226 the tail part of the directive line, i.e. the part which is past the
5227 initial whitespace, #, whitespace, directive-name, whitespace part. */
5230 debug_define (lineno
, buffer
)
5231 register unsigned lineno ATTRIBUTE_UNUSED
;
5232 register const char *buffer ATTRIBUTE_UNUSED
;
5234 #ifdef DWARF_DEBUGGING_INFO
5235 if (write_symbols
== DWARF_DEBUG
)
5236 dwarfout_define (lineno
, buffer
);
5237 #endif /* DWARF_DEBUGGING_INFO */
5238 #ifdef DWARF2_DEBUGGING_INFO
5239 if (write_symbols
== DWARF2_DEBUG
)
5240 dwarf2out_define (lineno
, buffer
);
5241 #endif /* DWARF2_DEBUGGING_INFO */
5244 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5245 the tail part of the directive line, i.e. the part which is past the
5246 initial whitespace, #, whitespace, directive-name, whitespace part. */
5249 debug_undef (lineno
, buffer
)
5250 register unsigned lineno ATTRIBUTE_UNUSED
;
5251 register const char *buffer ATTRIBUTE_UNUSED
;
5253 #ifdef DWARF_DEBUGGING_INFO
5254 if (write_symbols
== DWARF_DEBUG
)
5255 dwarfout_undef (lineno
, buffer
);
5256 #endif /* DWARF_DEBUGGING_INFO */
5257 #ifdef DWARF2_DEBUGGING_INFO
5258 if (write_symbols
== DWARF2_DEBUG
)
5259 dwarf2out_undef (lineno
, buffer
);
5260 #endif /* DWARF2_DEBUGGING_INFO */
5263 /* Returns nonzero if it is appropriate not to emit any debugging
5264 information for BLOCK, because it doesn't contain any instructions.
5265 This may not be the case for blocks containing nested functions, since
5266 we may actually call such a function even though the BLOCK information
5270 debug_ignore_block (block
)
5271 tree block ATTRIBUTE_UNUSED
;
5273 /* Never delete the BLOCK for the outermost scope
5274 of the function; we can refer to names from
5275 that scope even if the block notes are messed up. */
5276 if (is_body_block (block
))
5279 #ifdef DWARF2_DEBUGGING_INFO
5280 if (write_symbols
== DWARF2_DEBUG
)
5281 return dwarf2out_ignore_block (block
);