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 /* Number of error messages and warning messages so far. */
385 int warningcount
= 0;
388 /* Nonzero if we should exit after parsing options. */
389 static int exit_after_options
= 0;
391 /* The FUNCTION_DECL for the function currently being compiled,
392 or 0 if between functions. */
393 tree current_function_decl
;
395 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
397 tree current_function_func_begin_label
;
399 /* Pointer to function to compute the name to use to print a declaration.
400 DECL is the declaration in question.
401 VERBOSITY determines what information will be printed:
402 0: DECL_NAME, demangled as necessary.
403 1: and scope information.
404 2: and any other information that might be interesting, such as function
405 parameter types in C++. */
407 const char *(*decl_printable_name
) PARAMS ((tree
, int));
409 /* Pointer to function to compute rtl for a language-specific tree code. */
411 typedef rtx (*lang_expand_expr_t
)
412 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
413 enum expand_modifier modifier
));
415 lang_expand_expr_t lang_expand_expr
= 0;
417 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
419 /* Pointer to function to finish handling an incomplete decl at the
420 end of compilation. */
422 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
424 /* Nonzero if doing dwarf2 duplicate elimination. */
426 int flag_eliminate_dwarf2_dups
= 0;
428 /* Nonzero if generating code to do profiling. */
430 int profile_flag
= 0;
432 /* Nonzero if generating code to do profiling on a line-by-line basis. */
434 int profile_block_flag
;
436 /* Nonzero if generating code to profile program flow graph arcs. */
438 int profile_arc_flag
= 0;
440 /* Nonzero if generating info for gcov to calculate line test coverage. */
442 int flag_test_coverage
= 0;
444 /* Nonzero indicates that branch taken probabilities should be calculated. */
446 int flag_branch_probabilities
= 0;
448 /* Nonzero if basic blocks should be reordered. */
450 int flag_reorder_blocks
= 0;
452 /* Nonzero if registers should be renamed. */
454 int flag_rename_registers
= 0;
456 /* Nonzero for -pedantic switch: warn about anything
457 that standard spec forbids. */
461 /* Temporarily suppress certain warnings.
462 This is set while reading code from a system header file. */
464 int in_system_header
= 0;
466 /* Don't print functions as they are compiled. -quiet. */
470 /* Print times taken by the various passes. -ftime-report. */
474 /* Print memory still in use at end of compilation (which may have little
475 to do with peak memory consumption). -fmem-report. */
479 /* Non-zero means to collect statistics which might be expensive
480 and to print them when we are done. */
481 int flag_detailed_statistics
= 0;
486 /* Nonzero means `char' should be signed. */
488 int flag_signed_char
;
490 /* Nonzero means give an enum type only as many bytes as it needs. */
492 int flag_short_enums
;
494 /* Nonzero for -fcaller-saves: allocate values in regs that need to
495 be saved across function calls, if that produces overall better code.
496 Optional now, so people can test it. */
498 #ifdef DEFAULT_CALLER_SAVES
499 int flag_caller_saves
= 1;
501 int flag_caller_saves
= 0;
504 /* Nonzero if structures and unions should be returned in memory.
506 This should only be defined if compatibility with another compiler or
507 with an ABI is needed, because it results in slower code. */
509 #ifndef DEFAULT_PCC_STRUCT_RETURN
510 #define DEFAULT_PCC_STRUCT_RETURN 1
513 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
515 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
517 /* Nonzero for -fforce-mem: load memory value into a register
518 before arithmetic on it. This makes better cse but slower compilation. */
520 int flag_force_mem
= 0;
522 /* Nonzero for -fforce-addr: load memory address into a register before
523 reference to memory. This makes better cse but slower compilation. */
525 int flag_force_addr
= 0;
527 /* Nonzero for -fdefer-pop: don't pop args after each function call;
528 instead save them up to pop many calls' args with one insns. */
530 int flag_defer_pop
= 0;
532 /* Nonzero for -ffloat-store: don't allocate floats and doubles
533 in extended-precision registers. */
535 int flag_float_store
= 0;
537 /* Nonzero for -fcse-follow-jumps:
538 have cse follow jumps to do a more extensive job. */
540 int flag_cse_follow_jumps
;
542 /* Nonzero for -fcse-skip-blocks:
543 have cse follow a branch around a block. */
544 int flag_cse_skip_blocks
;
546 /* Nonzero for -fexpensive-optimizations:
547 perform miscellaneous relatively-expensive optimizations. */
548 int flag_expensive_optimizations
;
550 /* Nonzero for -fthread-jumps:
551 have jump optimize output of loop. */
553 int flag_thread_jumps
;
555 /* Nonzero enables strength-reduction in loop.c. */
557 int flag_strength_reduce
= 0;
559 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
560 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
561 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
564 int flag_unroll_loops
;
566 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
567 This is generally not a win. */
569 int flag_unroll_all_loops
;
571 /* Nonzero forces all invariant computations in loops to be moved
574 int flag_move_all_movables
= 0;
576 /* Nonzero forces all general induction variables in loops to be
579 int flag_reduce_all_givs
= 0;
581 /* Nonzero to perform full register move optimization passes. This is the
584 int flag_regmove
= 0;
586 /* Nonzero for -fwritable-strings:
587 store string constants in data segment and don't uniquize them. */
589 int flag_writable_strings
= 0;
591 /* Nonzero means don't put addresses of constant functions in registers.
592 Used for compiling the Unix kernel, where strange substitutions are
593 done on the assembly output. */
595 int flag_no_function_cse
= 0;
597 /* Nonzero for -fomit-frame-pointer:
598 don't make a frame pointer in simple functions that don't require one. */
600 int flag_omit_frame_pointer
= 0;
602 /* Nonzero means place each function into its own section on those platforms
603 which support arbitrary section names and unlimited numbers of sections. */
605 int flag_function_sections
= 0;
607 /* ... and similar for data. */
609 int flag_data_sections
= 0;
611 /* Nonzero to inhibit use of define_optimization peephole opts. */
613 int flag_no_peephole
= 0;
615 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
617 int flag_optimize_sibling_calls
= 0;
619 /* Nonzero means the front end generally wants `errno' maintained by math
620 operations, like built-in SQRT. */
622 int flag_errno_math
= 1;
624 /* Nonzero means that unsafe floating-point math optimizations are allowed
625 for the sake of speed. IEEE compliance is not guaranteed, and operations
626 are allowed to assume that their arguments and results are "normal"
627 (e.g., nonnegative for SQRT). */
629 int flag_unsafe_math_optimizations
= 0;
631 /* Zero means that floating-point math operations cannot generate a
632 (user-visible) trap. This is the case, for example, in nonstop
633 IEEE 754 arithmetic. */
635 int flag_trapping_math
= 1;
637 /* 0 means straightforward implementation of complex divide acceptable.
638 1 means wide ranges of inputs must work for complex divide.
639 2 means C99-like requirements for complex divide (not yet implemented). */
641 int flag_complex_divide_method
= 0;
643 /* Nonzero means all references through pointers are volatile. */
647 /* Nonzero means treat all global and extern variables as volatile. */
649 int flag_volatile_global
;
651 /* Nonzero means treat all static variables as volatile. */
653 int flag_volatile_static
;
655 /* Nonzero means just do syntax checking; don't output anything. */
657 int flag_syntax_only
= 0;
659 /* Nonzero means perform global cse. */
661 static int flag_gcse
;
663 /* Nonzero means to use global dataflow analysis to eliminate
664 useless null pointer tests. */
666 static int flag_delete_null_pointer_checks
;
668 /* Nonzero means to do the enhanced load motion during gcse, which trys
669 to hoist loads by not killing them when a store to the same location
672 int flag_gcse_lm
= 1;
674 /* Nonzero means to perform store motion after gcse, which will try to
675 move stores closer to the exit block. Its not very effective without
678 int flag_gcse_sm
= 1;
680 /* Nonzero means to rerun cse after loop optimization. This increases
681 compilation time about 20% and picks up a few more common expressions. */
683 static int flag_rerun_cse_after_loop
;
685 /* Nonzero means to run loop optimizations twice. */
687 int flag_rerun_loop_opt
;
689 /* Nonzero for -finline-functions: ok to inline functions that look like
690 good inline candidates. */
692 int flag_inline_functions
;
694 /* Nonzero for -fkeep-inline-functions: even if we make a function
695 go inline everywhere, keep its definition around for debugging
698 int flag_keep_inline_functions
;
700 /* Nonzero means that functions will not be inlined. */
704 /* Nonzero means that we should emit static const variables
705 regardless of whether or not optimization is turned on. */
707 int flag_keep_static_consts
= 1;
709 /* Nonzero means we should be saving declaration info into a .X file. */
711 int flag_gen_aux_info
= 0;
713 /* Specified name of aux-info file. */
715 static char *aux_info_file_name
;
717 /* Nonzero means make the text shared if supported. */
719 int flag_shared_data
;
721 /* Nonzero means schedule into delayed branch slots if supported. */
723 int flag_delayed_branch
;
725 /* Nonzero if we are compiling pure (sharable) code.
726 Value is 1 if we are doing reasonable (i.e. simple
727 offset into offset table) pic. Value is 2 if we can
728 only perform register offsets. */
732 /* Nonzero means generate extra code for exception handling and enable
733 exception handling. */
737 /* Nonzero means generate frame unwind info table when supported. */
739 int flag_unwind_tables
= 0;
741 /* Nonzero means don't place uninitialized global data in common storage
746 /* Nonzero means pretend it is OK to examine bits of target floats,
747 even if that isn't true. The resulting code will have incorrect constants,
748 but the same series of instructions that the native compiler would make. */
750 int flag_pretend_float
;
752 /* Nonzero means change certain warnings into errors.
753 Usually these are warnings about failure to conform to some standard. */
755 int flag_pedantic_errors
= 0;
757 /* flag_schedule_insns means schedule insns within basic blocks (before
759 flag_schedule_insns_after_reload means schedule insns after
762 int flag_schedule_insns
= 0;
763 int flag_schedule_insns_after_reload
= 0;
765 /* The following flags have effect only for scheduling before register
768 flag_schedule_interblock means schedule insns accross basic blocks.
769 flag_schedule_speculative means allow speculative motion of non-load insns.
770 flag_schedule_speculative_load means allow speculative motion of some
772 flag_schedule_speculative_load_dangerous allows speculative motion of more
775 int flag_schedule_interblock
= 1;
776 int flag_schedule_speculative
= 1;
777 int flag_schedule_speculative_load
= 0;
778 int flag_schedule_speculative_load_dangerous
= 0;
780 int flag_single_precision_constant
;
782 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
783 by a cheaper branch on a count register. */
784 int flag_branch_on_count_reg
= 1;
786 /* -finhibit-size-directive inhibits output of .size for ELF.
787 This is used only for compiling crtstuff.c,
788 and it may be extended to other effects
789 needed for crtstuff.c on other systems. */
790 int flag_inhibit_size_directive
= 0;
792 /* -fverbose-asm causes extra commentary information to be produced in
793 the generated assembly code (to make it more readable). This option
794 is generally only of use to those who actually need to read the
795 generated assembly code (perhaps while debugging the compiler itself).
796 -fno-verbose-asm, the default, causes the extra information
797 to be omitted and is useful when comparing two assembler files. */
799 int flag_verbose_asm
= 0;
801 /* -dA causes debug commentary information to be produced in
802 the generated assembly code (to make it more readable). This option
803 is generally only of use to those who actually need to read the
804 generated assembly code (perhaps while debugging the compiler itself).
805 Currently, this switch is only used by dwarfout.c; however, it is intended
806 to be a catchall for printing debug information in the assembler file. */
808 int flag_debug_asm
= 0;
810 /* -dP causes the rtl to be emitted as a comment in assembly. */
812 int flag_dump_rtl_in_asm
= 0;
814 /* -fgnu-linker specifies use of the GNU linker for initializations.
815 (Or, more generally, a linker that handles initializations.)
816 -fno-gnu-linker says that collect2 will be used. */
818 int flag_gnu_linker
= 0;
820 int flag_gnu_linker
= 1;
826 /* Enable dead code elimination. */
829 /* Tag all structures with __attribute__(packed). */
830 int flag_pack_struct
= 0;
832 /* Emit code to check for stack overflow; also may cause large objects
833 to be allocated dynamically. */
834 int flag_stack_check
;
836 /* When non-NULL, indicates that whenever space is allocated on the
837 stack, the resulting stack pointer must not pass this
838 address---that is, for stacks that grow downward, the stack pointer
839 must always be greater than or equal to this address; for stacks
840 that grow upward, the stack pointer must be less than this address.
841 At present, the rtx may be either a REG or a SYMBOL_REF, although
842 the support provided depends on the backend. */
845 /* -fcheck-memory-usage causes extra code to be generated in order to check
846 memory accesses. This is used by a detector of bad memory accesses such
848 int flag_check_memory_usage
= 0;
850 /* -fprefix-function-name causes function name to be prefixed. This
851 can be used with -fcheck-memory-usage to isolate code compiled with
852 -fcheck-memory-usage. */
853 int flag_prefix_function_name
= 0;
855 /* 0 if pointer arguments may alias each other. True in C.
856 1 if pointer arguments may not alias each other but may alias
858 2 if pointer arguments may not alias each other and may not
859 alias global variables. True in Fortran.
860 This defaults to 0 for C. */
861 int flag_argument_noalias
= 0;
863 /* Nonzero if we should do (language-dependent) alias analysis.
864 Typically, this analysis will assume that expressions of certain
865 types do not alias expressions of certain other types. Only used
866 if alias analysis (in general) is enabled. */
867 int flag_strict_aliasing
= 0;
869 /* Instrument functions with calls at entry and exit, for profiling. */
870 int flag_instrument_function_entry_exit
= 0;
872 /* Nonzero means ignore `#ident' directives. 0 means handle them.
873 On SVR4 targets, it also controls whether or not to emit a
874 string identifying the compiler. */
876 int flag_no_ident
= 0;
878 /* This will perform a peephole pass before sched2. */
879 int flag_peephole2
= 0;
881 /* This will try to guess branch probabilities. */
882 int flag_guess_branch_prob
= 0;
884 /* -fbounded-pointers causes gcc to compile pointers as composite
885 objects occupying three words: the pointer value, the base address
886 of the referent object, and the address immediately beyond the end
887 of the referent object. The base and extent allow us to perform
888 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
889 int flag_bounded_pointers
= 0;
891 /* -fcheck-bounds causes gcc to generate array bounds checks.
892 For C, C++: defaults to value of flag_bounded_pointers.
893 For ObjC: defaults to off.
894 For Java: defaults to on.
895 For Fortran: defaults to off.
896 For CHILL: defaults to off. */
897 int flag_bounds_check
= 0;
899 /* If one, renumber instruction UIDs to reduce the number of
900 unused UIDs if there are a lot of instructions. If greater than
901 one, unconditionally renumber instruction UIDs. */
902 int flag_renumber_insns
= 1;
904 /* Values of the -falign-* flags: how much to align labels in code.
905 0 means `use default', 1 means `don't align'.
906 For each variable, there is an _log variant which is the power
907 of two not less than the variable, for .align output. */
914 int align_labels_log
;
916 int align_functions_log
;
918 /* Table of supported debugging formats. */
922 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
923 constant expression, we use NO_DEBUG in its place. */
924 enum debug_info_type debug_type
;
925 int use_extensions_p
;
926 const char *description
;
930 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
931 N_("Generate debugging info in default format") },
932 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
933 #ifdef DBX_DEBUGGING_INFO
934 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
935 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
937 #ifdef DWARF_DEBUGGING_INFO
938 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
939 { "dwarf+", DWARF_DEBUG
, 1,
940 N_("Generate extended DWARF-1 format debug info") },
942 #ifdef DWARF2_DEBUGGING_INFO
943 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
945 #ifdef XCOFF_DEBUGGING_INFO
946 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
947 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
949 #ifdef SDB_DEBUGGING_INFO
950 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
960 const char *description
;
962 lang_independent_options
;
966 /* Add or remove a leading underscore from user symbols. */
967 int flag_leading_underscore
= -1;
969 /* The user symbol prefix after having resolved same. */
970 const char *user_label_prefix
;
972 static const param_info lang_independent_params
[] = {
973 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
974 { OPTION, DEFAULT, HELP },
975 #include "params.def"
980 /* A default for same. */
981 #ifndef USER_LABEL_PREFIX
982 #define USER_LABEL_PREFIX ""
985 /* Table of language-independent -f options.
986 STRING is the option name. VARIABLE is the address of the variable.
987 ON_VALUE is the value to store in VARIABLE
988 if `-fSTRING' is seen as an option.
989 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
991 lang_independent_options f_options
[] =
993 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
994 N_("Perform DWARF2 duplicate elimination") },
995 {"float-store", &flag_float_store
, 1,
996 N_("Do not store floats in registers") },
997 {"volatile", &flag_volatile
, 1,
998 N_("Consider all mem refs through pointers as volatile") },
999 {"volatile-global", &flag_volatile_global
, 1,
1000 N_("Consider all mem refs to global data to be volatile") },
1001 {"volatile-static", &flag_volatile_static
, 1,
1002 N_("Consider all mem refs to static data to be volatile") },
1003 {"defer-pop", &flag_defer_pop
, 1,
1004 N_("Defer popping functions args from stack until later") },
1005 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1006 N_("When possible do not generate stack frames") },
1007 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1008 N_("Optimize sibling and tail recursive calls") },
1009 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1010 N_("When running CSE, follow jumps to their targets") },
1011 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1012 N_("When running CSE, follow conditional jumps") },
1013 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1014 N_("Perform a number of minor, expensive optimisations") },
1015 {"thread-jumps", &flag_thread_jumps
, 1,
1016 N_("Perform jump threading optimisations") },
1017 {"strength-reduce", &flag_strength_reduce
, 1,
1018 N_("Perform strength reduction optimisations") },
1019 {"unroll-loops", &flag_unroll_loops
, 1,
1020 N_("Perform loop unrolling when iteration count is known") },
1021 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1022 N_("Perform loop unrolling for all loops") },
1023 {"move-all-movables", &flag_move_all_movables
, 1,
1024 N_("Force all loop invariant computations out of loops") },
1025 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1026 N_("Strength reduce all loop general induction variables") },
1027 {"writable-strings", &flag_writable_strings
, 1,
1028 N_("Store strings in writable data section") },
1029 {"peephole", &flag_no_peephole
, 0,
1030 N_("Enable machine specific peephole optimisations") },
1031 {"force-mem", &flag_force_mem
, 1,
1032 N_("Copy memory operands into registers before using") },
1033 {"force-addr", &flag_force_addr
, 1,
1034 N_("Copy memory address constants into regs before using") },
1035 {"function-cse", &flag_no_function_cse
, 0,
1036 N_("Allow function addresses to be held in registers") },
1037 {"inline-functions", &flag_inline_functions
, 1,
1038 N_("Integrate simple functions into their callers") },
1039 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1040 N_("Generate code for funcs even if they are fully inlined") },
1041 {"inline", &flag_no_inline
, 0,
1042 N_("Pay attention to the 'inline' keyword") },
1043 {"keep-static-consts", &flag_keep_static_consts
, 1,
1044 N_("Emit static const variables even if they are not used") },
1045 {"syntax-only", &flag_syntax_only
, 1,
1046 N_("Check for syntax errors, then stop") },
1047 {"shared-data", &flag_shared_data
, 1,
1048 N_("Mark data as shared rather than private") },
1049 {"caller-saves", &flag_caller_saves
, 1,
1050 N_("Enable saving registers around function calls") },
1051 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1052 N_("Return 'short' aggregates in memory, not registers") },
1053 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1054 N_("Return 'short' aggregates in registers") },
1055 {"delayed-branch", &flag_delayed_branch
, 1,
1056 N_("Attempt to fill delay slots of branch instructions") },
1057 {"gcse", &flag_gcse
, 1,
1058 N_("Perform the global common subexpression elimination") },
1059 {"gcse-lm", &flag_gcse_lm
, 1,
1060 N_("Perform enhanced load motion during global subexpression elimination") },
1061 {"gcse-sm", &flag_gcse_sm
, 1,
1062 N_("Perform store motion after global subexpression elimination") },
1063 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1064 N_("Run CSE pass after loop optimisations") },
1065 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1066 N_("Run the loop optimiser twice") },
1067 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1068 N_("Delete useless null pointer checks") },
1069 {"pretend-float", &flag_pretend_float
, 1,
1070 N_("Pretend that host and target use the same FP format") },
1071 {"schedule-insns", &flag_schedule_insns
, 1,
1072 N_("Reschedule instructions before register allocation") },
1073 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1074 N_("Reschedule instructions after register allocation") },
1075 {"sched-interblock",&flag_schedule_interblock
, 1,
1076 N_("Enable scheduling across basic blocks") },
1077 {"sched-spec",&flag_schedule_speculative
, 1,
1078 N_("Allow speculative motion of non-loads") },
1079 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1080 N_("Allow speculative motion of some loads") },
1081 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1082 N_("Allow speculative motion of more loads") },
1083 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1084 N_("Replace add,compare,branch with branch on count reg") },
1085 {"pic", &flag_pic
, 1,
1086 N_("Generate position independent code, if possible") },
1087 {"PIC", &flag_pic
, 2, ""},
1088 {"exceptions", &flag_exceptions
, 1,
1089 N_("Enable exception handling") },
1090 {"unwind-tables", &flag_unwind_tables
, 1,
1091 N_("Just generate unwind tables for exception handling") },
1092 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1093 N_("Support synchronous non-call exceptions") },
1094 {"profile-arcs", &profile_arc_flag
, 1,
1095 N_("Insert arc based program profiling code") },
1096 {"test-coverage", &flag_test_coverage
, 1,
1097 N_("Create data files needed by gcov") },
1098 {"branch-probabilities", &flag_branch_probabilities
, 1,
1099 N_("Use profiling information for branch probabilities") },
1100 {"reorder-blocks", &flag_reorder_blocks
, 1,
1101 N_("Reorder basic blocks to improve code placement") },
1102 {"rename-registers", &flag_rename_registers
, 1,
1103 N_("Do the register renaming optimization pass") },
1104 {"common", &flag_no_common
, 0,
1105 N_("Do not put unitialised globals in the common section") },
1106 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1107 N_("Do not generate .size directives") },
1108 {"function-sections", &flag_function_sections
, 1,
1109 N_("place each function into its own section") },
1110 {"data-sections", &flag_data_sections
, 1,
1111 N_("place data items into their own section") },
1112 {"verbose-asm", &flag_verbose_asm
, 1,
1113 N_("Add extra commentry to assembler output") },
1114 {"gnu-linker", &flag_gnu_linker
, 1,
1115 N_("Output GNU ld formatted global initialisers") },
1116 {"regmove", &flag_regmove
, 1,
1117 N_("Enables a register move optimisation") },
1118 {"optimize-register-move", &flag_regmove
, 1,
1119 N_("Do the full regmove optimization pass") },
1120 {"pack-struct", &flag_pack_struct
, 1,
1121 N_("Pack structure members together without holes") },
1122 {"stack-check", &flag_stack_check
, 1,
1123 N_("Insert stack checking code into the program") },
1124 {"argument-alias", &flag_argument_noalias
, 0,
1125 N_("Specify that arguments may alias each other & globals") },
1126 {"argument-noalias", &flag_argument_noalias
, 1,
1127 N_("Assume arguments may alias globals but not each other") },
1128 {"argument-noalias-global", &flag_argument_noalias
, 2,
1129 N_("Assume arguments do not alias each other or globals") },
1130 {"strict-aliasing", &flag_strict_aliasing
, 1,
1131 N_("Assume strict aliasing rules apply") },
1132 {"align-loops", &align_loops
, 0,
1133 N_("Align the start of loops") },
1134 {"align-jumps", &align_jumps
, 0,
1135 N_("Align labels which are only reached by jumping") },
1136 {"align-labels", &align_labels
, 0,
1137 N_("Align all labels") },
1138 {"align-functions", &align_functions
, 0,
1139 N_("Align the start of functions") },
1140 {"check-memory-usage", &flag_check_memory_usage
, 1,
1141 N_("Generate code to check every memory access") },
1142 {"prefix-function-name", &flag_prefix_function_name
, 1,
1143 N_("Add a prefix to all function names") },
1144 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1145 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1146 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1147 N_("Instrument function entry/exit with profiling calls") },
1148 {"ssa", &flag_ssa
, 1,
1149 N_("Enable SSA optimizations") },
1150 {"dce", &flag_dce
, 1,
1151 N_("Enable dead code elimination") },
1152 {"leading-underscore", &flag_leading_underscore
, 1,
1153 N_("External symbols have a leading underscore") },
1154 {"ident", &flag_no_ident
, 0,
1155 N_("Process #ident directives") },
1156 { "peephole2", &flag_peephole2
, 1,
1157 N_("Enables an rtl peephole pass run before sched2") },
1158 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1159 N_("Enables guessing of branch probabilities") },
1160 {"math-errno", &flag_errno_math
, 1,
1161 N_("Set errno after built-in math functions") },
1162 {"trapping-math", &flag_trapping_math
, 1,
1163 N_("Floating-point operations can trap") },
1164 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1165 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1166 {"bounded-pointers", &flag_bounded_pointers
, 1,
1167 N_("Compile pointers as triples: value, base & end") },
1168 {"bounds-check", &flag_bounds_check
, 1,
1169 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1170 {"single-precision-constant", &flag_single_precision_constant
, 1,
1171 N_("Convert floating point constant to single precision constant") },
1172 {"time-report", &time_report
, 1,
1173 N_("Report time taken by each compiler pass at end of run") },
1174 {"mem-report", &mem_report
, 1,
1175 N_("Report on permanent memory allocation at end of run") },
1176 { "trapv", &flag_trapv
, 1,
1177 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1180 /* Table of language-specific options. */
1182 static struct lang_opt
1185 const char *description
;
1187 documented_lang_options
[] =
1189 /* In order not to overload the --help output, the convention
1190 used here is to only describe those options which are not
1191 enabled by default. */
1194 N_("Compile just for ISO C89") },
1195 { "-fallow-single-precision",
1196 N_("Do not promote floats to double if using -traditional") },
1198 N_("Determine language standard") },
1200 { "-fsigned-bitfields", "" },
1201 { "-funsigned-bitfields",
1202 N_("Make bitfields by unsigned by default") },
1203 { "-fno-signed-bitfields", "" },
1204 { "-fno-unsigned-bitfields","" },
1206 N_("Make 'char' be signed by default") },
1207 { "-funsigned-char",
1208 N_("Make 'char' be unsigned by default") },
1209 { "-fno-signed-char", "" },
1210 { "-fno-unsigned-char", "" },
1212 { "-ftraditional", "" },
1214 N_("Attempt to support traditional K&R style C") },
1215 { "-fnotraditional", "" },
1216 { "-fno-traditional", "" },
1220 N_("Do not recognise the 'asm' keyword") },
1221 { "-fbuiltin", "" },
1223 N_("Do not recognise any built in functions") },
1225 N_("Assume normal C execution environment") },
1226 { "-fno-hosted", "" },
1228 N_("Assume that standard libraries & main might not exist") },
1229 { "-fno-freestanding", "" },
1230 { "-fcond-mismatch",
1231 N_("Allow different types as args of ? operator") },
1232 { "-fno-cond-mismatch", "" },
1233 { "-fdollars-in-identifiers",
1234 N_("Allow the use of $ inside identifiers") },
1235 { "-fno-dollars-in-identifiers", "" },
1236 { "-fpreprocessed", "" },
1237 { "-fno-preprocessed", "" },
1239 N_("Use the same size for double as for float") },
1240 { "-fno-short-double", "" },
1242 N_("Use the smallest fitting integer to hold enums") },
1243 { "-fno-short-enums", "" },
1245 N_("Override the underlying type for wchar_t to `unsigned short'") },
1246 { "-fno-short-wchar", "" },
1249 N_("Enable most warning messages") },
1250 { "-Wbad-function-cast",
1251 N_("Warn about casting functions to incompatible types") },
1252 { "-Wno-bad-function-cast", "" },
1253 { "-Wno-missing-noreturn", "" },
1254 { "-Wmissing-format-attribute",
1255 N_("Warn about functions which might be candidates for format attributes") },
1256 { "-Wno-missing-format-attribute", "" },
1258 N_("Warn about casts which discard qualifiers") },
1259 { "-Wno-cast-qual", "" },
1260 { "-Wchar-subscripts",
1261 N_("Warn about subscripts whose type is 'char'") },
1262 { "-Wno-char-subscripts", "" },
1264 N_("Warn if nested comments are detected") },
1265 { "-Wno-comment", "" },
1267 N_("Warn if nested comments are detected") },
1268 { "-Wno-comments", "" },
1270 N_("Warn about possibly confusing type conversions") },
1271 { "-Wno-conversion", "" },
1273 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1274 { "-Wno-format", "" },
1275 { "-Wformat-y2k", "" },
1276 { "-Wno-format-y2k",
1277 N_("Don't warn about strftime formats yielding 2 digit years") },
1278 { "-Wformat-extra-args", "" },
1279 { "-Wno-format-extra-args",
1280 N_("Don't warn about too many arguments to format functions") },
1281 { "-Wformat-nonliteral",
1282 N_("Warn about non-string-literal format strings") },
1283 { "-Wno-format-nonliteral", "" },
1284 { "-Wformat-security",
1285 N_("Warn about possible security problems with format functions") },
1286 { "-Wno-format-security", "" },
1287 { "-Wimplicit-function-declaration",
1288 N_("Warn about implicit function declarations") },
1289 { "-Wno-implicit-function-declaration", "" },
1290 { "-Werror-implicit-function-declaration", "" },
1292 N_("Warn when a declaration does not specify a type") },
1293 { "-Wno-implicit-int", "" },
1294 { "-Wimplicit", "" },
1295 { "-Wno-implicit", "" },
1297 N_("Warn about the use of the #import directive") },
1298 { "-Wno-import", "" },
1299 { "-Wlong-long","" },
1301 N_("Do not warn about using 'long long' when -pedantic") },
1303 N_("Warn about suspicious declarations of main") },
1304 { "-Wno-main", "" },
1305 { "-Wmissing-braces",
1306 N_("Warn about possibly missing braces around initialisers") },
1307 { "-Wno-missing-braces", "" },
1308 { "-Wmissing-declarations",
1309 N_("Warn about global funcs without previous declarations") },
1310 { "-Wno-missing-declarations", "" },
1311 { "-Wmissing-prototypes",
1312 N_("Warn about global funcs without prototypes") },
1313 { "-Wno-missing-prototypes", "" },
1315 N_("Warn about use of multicharacter literals") },
1316 { "-Wno-multichar", "" },
1317 { "-Wnested-externs",
1318 N_("Warn about externs not at file scope level") },
1319 { "-Wno-nested-externs", "" },
1321 N_("Warn about possible missing parentheses") },
1322 { "-Wno-parentheses", "" },
1323 { "-Wsequence-point",
1324 N_("Warn about possible violations of sequence point rules") },
1325 { "-Wno-sequence-point", "" },
1326 { "-Wpointer-arith",
1327 N_("Warn about function pointer arithmetic") },
1328 { "-Wno-pointer-arith", "" },
1329 { "-Wredundant-decls",
1330 N_("Warn about multiple declarations of the same object") },
1331 { "-Wno-redundant-decls", "" },
1333 N_("Warn about signed/unsigned comparisons") },
1334 { "-Wno-sign-compare", "" },
1336 N_("Warn about testing equality of floating point numbers") },
1337 { "-Wno-float-equal", "" },
1338 { "-Wunknown-pragmas",
1339 N_("Warn about unrecognized pragmas") },
1340 { "-Wno-unknown-pragmas", "" },
1341 { "-Wstrict-prototypes",
1342 N_("Warn about non-prototyped function decls") },
1343 { "-Wno-strict-prototypes", "" },
1345 N_("Warn about constructs whose meaning change in ISO C") },
1346 { "-Wno-traditional", "" },
1348 N_("Warn when trigraphs are encountered") },
1349 { "-Wno-trigraphs", "" },
1351 { "-Wno-undef", "" },
1352 { "-Wwrite-strings",
1353 N_("Mark strings as 'const char *'") },
1354 { "-Wno-write-strings", "" },
1356 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1358 #include "options.h"
1362 /* Here is a table, controlled by the tm.h file, listing each -m switch
1363 and which bits in `target_switches' it should set or clear.
1364 If VALUE is positive, it is bits to set.
1365 If VALUE is negative, -VALUE is bits to clear.
1366 (The sign bit is not used so there is no confusion.) */
1372 const char *description
;
1374 target_switches
[] = TARGET_SWITCHES
;
1376 /* This table is similar, but allows the switch to have a value. */
1378 #ifdef TARGET_OPTIONS
1382 const char **variable
;
1383 const char *description
;
1385 target_options
[] = TARGET_OPTIONS
;
1388 /* Options controlling warnings. */
1390 /* Don't print warning messages. -w. */
1392 int inhibit_warnings
= 0;
1394 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1396 int warn_system_headers
= 0;
1398 /* Print various extra warnings. -W. */
1400 int extra_warnings
= 0;
1402 /* Treat warnings as errors. -Werror. */
1404 int warnings_are_errors
= 0;
1406 /* Nonzero to warn about unused variables, functions et.al. */
1408 int warn_unused_function
;
1409 int warn_unused_label
;
1410 int warn_unused_parameter
;
1411 int warn_unused_variable
;
1412 int warn_unused_value
;
1415 set_Wunused (setting
)
1418 warn_unused_function
= setting
;
1419 warn_unused_label
= setting
;
1420 /* Unused function parameter warnings are reported when either ``-W
1421 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1422 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1424 warn_unused_parameter
= 0;
1425 else if (!warn_unused_parameter
)
1426 warn_unused_parameter
= -1;
1427 warn_unused_variable
= setting
;
1428 warn_unused_value
= setting
;
1431 /* Nonzero to warn about code which is never reached. */
1433 int warn_notreached
;
1435 /* Nonzero to warn about variables used before they are initialized. */
1437 int warn_uninitialized
;
1439 /* Nonzero means warn about all declarations which shadow others. */
1443 /* Warn if a switch on an enum fails to have a case for every enum value. */
1447 /* Nonzero means warn about function definitions that default the return type
1448 or that use a null return and have a return-type other than void. */
1450 int warn_return_type
;
1452 /* Nonzero means warn about pointer casts that increase the required
1453 alignment of the target type (and might therefore lead to a crash
1454 due to a misaligned access). */
1456 int warn_cast_align
;
1458 /* Nonzero means warn about any identifiers that match in the first N
1459 characters. The value N is in `id_clash_len'. */
1462 unsigned int id_clash_len
;
1464 /* Nonzero means warn about any objects definitions whose size is larger
1465 than N bytes. Also want about function definitions whose returned
1466 values are larger than N bytes. The value N is in `larger_than_size'. */
1468 int warn_larger_than
;
1469 HOST_WIDE_INT larger_than_size
;
1471 /* Nonzero means warn if inline function is too large. */
1475 /* Warn if a function returns an aggregate,
1476 since there are often incompatible calling conventions for doing this. */
1478 int warn_aggregate_return
;
1480 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1484 /* Warn when gcc pads a structure to an alignment boundary. */
1488 /* Warn when an optimization pass is disabled. */
1490 int warn_disabled_optimization
;
1492 /* Warn about functions which might be candidates for attribute noreturn. */
1494 int warn_missing_noreturn
;
1496 /* Likewise for -W. */
1498 lang_independent_options W_options
[] =
1500 {"unused-function", &warn_unused_function
, 1,
1501 N_("Warn when a function is unused") },
1502 {"unused-label", &warn_unused_label
, 1,
1503 N_("Warn when a label is unused") },
1504 {"unused-parameter", &warn_unused_parameter
, 1,
1505 N_("Warn when a function parameter is unused") },
1506 {"unused-variable", &warn_unused_variable
, 1,
1507 N_("Warn when a variable is unused") },
1508 {"unused-value", &warn_unused_value
, 1,
1509 N_("Warn when an expression value is unused") },
1510 {"system-headers", &warn_system_headers
, 1,
1511 N_("Do not suppress warnings from system headers") },
1512 {"error", &warnings_are_errors
, 1,
1513 N_("Treat all warnings as errors") },
1514 {"shadow", &warn_shadow
, 1,
1515 N_("Warn when one local variable shadows another") },
1516 {"switch", &warn_switch
, 1,
1517 N_("Warn about enumerated switches missing a specific case") },
1518 {"aggregate-return", &warn_aggregate_return
, 1,
1519 N_("Warn about returning structures, unions or arrays") },
1520 {"cast-align", &warn_cast_align
, 1,
1521 N_("Warn about pointer casts which increase alignment") },
1522 {"unreachable-code", &warn_notreached
, 1,
1523 N_("Warn about code that will never be executed") },
1524 {"uninitialized", &warn_uninitialized
, 1,
1525 N_("Warn about unitialized automatic variables") },
1526 {"inline", &warn_inline
, 1,
1527 N_("Warn when an inlined function cannot be inlined") },
1528 {"packed", &warn_packed
, 1,
1529 N_("Warn when the packed attribute has no effect on struct layout") },
1530 {"padded", &warn_padded
, 1,
1531 N_("Warn when padding is required to align struct members") },
1532 {"disabled-optimization", &warn_disabled_optimization
, 1,
1533 N_("Warn when an optimization pass is disabled") },
1534 {"missing-noreturn", &warn_missing_noreturn
, 1,
1535 N_("Warn about functions which might be candidates for attribute noreturn") }
1538 /* The following routines are useful in setting all the flags that
1539 -ffast-math and -fno-fast-math imply. */
1542 set_fast_math_flags ()
1544 flag_trapping_math
= 0;
1545 flag_unsafe_math_optimizations
= 1;
1546 flag_errno_math
= 0;
1550 set_no_fast_math_flags ()
1552 flag_trapping_math
= 1;
1553 flag_unsafe_math_optimizations
= 0;
1554 flag_errno_math
= 1;
1558 /* Output files for assembler code (real compiler output)
1559 and debugging dumps. */
1562 FILE *aux_info_file
;
1563 FILE *rtl_dump_file
= NULL
;
1565 /* Decode the string P as an integral parameter.
1566 If the string is indeed an integer return its numeric value else
1567 issue an Invalid Option error for the option PNAME and return DEFVAL.
1568 If PNAME is zero just return DEFVAL, do not call error. */
1571 read_integral_parameter (p
, pname
, defval
)
1576 const char *endp
= p
;
1580 if (*endp
>= '0' && *endp
<= '9')
1589 error ("Invalid option `%s'", pname
);
1597 /* This is the default decl_printable_name function. */
1600 decl_name (decl
, verbosity
)
1602 int verbosity ATTRIBUTE_UNUSED
;
1604 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1608 /* This calls abort and is used to avoid problems when abort if a macro.
1609 It is used when we need to pass the address of abort. */
1617 /* When `malloc.c' is compiled with `rcheck' defined,
1618 it calls this function to report clobberage. */
1622 const char *s ATTRIBUTE_UNUSED
;
1627 /* Return the logarithm of X, base 2, considering X unsigned,
1628 if X is a power of 2. Otherwise, returns -1.
1630 This should be used via the `exact_log2' macro. */
1634 register unsigned HOST_WIDE_INT x
;
1636 register int log
= 0;
1637 /* Test for 0 or a power of 2. */
1638 if (x
== 0 || x
!= (x
& -x
))
1640 while ((x
>>= 1) != 0)
1645 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1646 If X is 0, return -1.
1648 This should be used via the floor_log2 macro. */
1652 register unsigned HOST_WIDE_INT x
;
1654 register int log
= -1;
1661 static int float_handler_set
;
1663 jmp_buf float_handler
;
1665 /* Signals actually come here. */
1668 float_signal (signo
)
1669 /* If this is missing, some compilers complain. */
1670 int signo ATTRIBUTE_UNUSED
;
1672 if (float_handled
== 0)
1673 crash_signal (signo
);
1676 /* On System-V derived systems, we must reinstall the signal handler.
1677 This is harmless on BSD-derived systems. */
1678 signal (SIGFPE
, float_signal
);
1679 longjmp (float_handler
, 1);
1682 /* Specify where to longjmp to when a floating arithmetic error happens.
1683 If HANDLER is 0, it means don't handle the errors any more. */
1686 set_float_handler (handler
)
1689 float_handled
= (handler
!= 0);
1691 memcpy (float_handler
, handler
, sizeof (float_handler
));
1693 if (float_handled
&& ! float_handler_set
)
1695 signal (SIGFPE
, float_signal
);
1696 float_handler_set
= 1;
1700 /* This is a wrapper function for code which might elicit an
1701 arithmetic exception. That code should be passed in as a function
1702 pointer FN, and one argument DATA. DATA is usually a struct which
1703 contains the real input and output for function FN. This function
1704 returns 0 (failure) if longjmp was called (i.e. an exception
1705 occured.) It returns 1 (success) otherwise. */
1708 do_float_handler (fn
, data
)
1709 void (*fn
) PARAMS ((PTR
));
1716 /* We got here via longjmp () caused by an exception in function
1718 set_float_handler (NULL
);
1722 set_float_handler (buf
);
1724 set_float_handler (NULL
);
1728 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1729 into ICE messages, which is much more user friendly. */
1732 crash_signal (signo
)
1735 internal_error ("Internal error: %s", strsignal (signo
));
1738 /* Strip off a legitimate source ending from the input string NAME of
1739 length LEN. Rather than having to know the names used by all of
1740 our front ends, we strip off an ending of a period followed by
1741 up to five characters. (Java uses ".class".) */
1744 strip_off_ending (name
, len
)
1749 for (i
= 2; i
< 6 && len
> i
; i
++)
1751 if (name
[len
- i
] == '.')
1753 name
[len
- i
] = '\0';
1759 /* Output a quoted string. */
1762 output_quoted_string (asm_file
, string
)
1766 #ifdef OUTPUT_QUOTED_STRING
1767 OUTPUT_QUOTED_STRING (asm_file
, string
);
1771 putc ('\"', asm_file
);
1772 while ((c
= *string
++) != 0)
1774 if (c
== '\"' || c
== '\\')
1775 putc ('\\', asm_file
);
1778 putc ('\"', asm_file
);
1782 /* Output a file name in the form wanted by System V. */
1785 output_file_directive (asm_file
, input_name
)
1787 const char *input_name
;
1789 int len
= strlen (input_name
);
1790 const char *na
= input_name
+ len
;
1792 /* NA gets INPUT_NAME sans directory names. */
1793 while (na
> input_name
)
1795 if (IS_DIR_SEPARATOR (na
[-1]))
1800 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1801 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1803 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1804 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1806 fprintf (asm_file
, "\t.file\t");
1807 output_quoted_string (asm_file
, na
);
1808 fputc ('\n', asm_file
);
1813 /* Routine to open a dump file. Return true if the dump file is enabled. */
1816 open_dump_file (index
, decl
)
1817 enum dump_file_index index
;
1821 const char *open_arg
;
1824 if (! dump_file
[index
].enabled
)
1827 timevar_push (TV_DUMP
);
1828 if (rtl_dump_file
!= NULL
)
1829 fclose (rtl_dump_file
);
1831 sprintf (seq
, ".%02d.", index
);
1833 if (! dump_file
[index
].initialized
)
1835 /* If we've not initialized the files, do so now. */
1836 if (graph_dump_format
!= no_graph
1837 && dump_file
[index
].graph_dump_p
)
1839 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1840 clean_graph_dump_file (dump_base_name
, dump_name
);
1843 dump_file
[index
].initialized
= 1;
1849 dump_name
= concat (dump_base_name
, seq
,
1850 dump_file
[index
].extension
, NULL
);
1852 rtl_dump_file
= fopen (dump_name
, open_arg
);
1853 if (rtl_dump_file
== NULL
)
1854 fatal_io_error ("can't open %s", dump_name
);
1859 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1860 decl_printable_name (decl
, 2));
1862 timevar_pop (TV_DUMP
);
1866 /* Routine to close a dump file. */
1869 close_dump_file (index
, func
, insns
)
1870 enum dump_file_index index
;
1871 void (*func
) PARAMS ((FILE *, rtx
));
1874 if (! rtl_dump_file
)
1877 timevar_push (TV_DUMP
);
1879 && graph_dump_format
!= no_graph
1880 && dump_file
[index
].graph_dump_p
)
1885 sprintf (seq
, ".%02d.", index
);
1886 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1887 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1892 func (rtl_dump_file
, insns
);
1894 fflush (rtl_dump_file
);
1895 fclose (rtl_dump_file
);
1897 rtl_dump_file
= NULL
;
1898 timevar_pop (TV_DUMP
);
1901 /* Do any final processing required for the declarations in VEC, of
1902 which there are LEN. We write out inline functions and variables
1903 that have been deferred until this point, but which are required.
1904 Returns non-zero if anything was put out. */
1907 wrapup_global_declarations (vec
, len
)
1914 int output_something
= 0;
1916 for (i
= 0; i
< len
; i
++)
1920 /* We're not deferring this any longer. */
1921 DECL_DEFER_OUTPUT (decl
) = 0;
1923 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1924 && incomplete_decl_finalize_hook
!= 0)
1925 (*incomplete_decl_finalize_hook
) (decl
);
1928 /* Now emit any global variables or functions that we have been
1929 putting off. We need to loop in case one of the things emitted
1930 here references another one which comes earlier in the list. */
1934 for (i
= 0; i
< len
; i
++)
1938 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1941 /* Don't write out static consts, unless we still need them.
1943 We also keep static consts if not optimizing (for debugging),
1944 unless the user specified -fno-keep-static-consts.
1945 ??? They might be better written into the debug information.
1946 This is possible when using DWARF.
1948 A language processor that wants static constants to be always
1949 written out (even if it is not used) is responsible for
1950 calling rest_of_decl_compilation itself. E.g. the C front-end
1951 calls rest_of_decl_compilation from finish_decl.
1952 One motivation for this is that is conventional in some
1953 environments to write things like:
1954 static const char rcsid[] = "... version string ...";
1955 intending to force the string to be in the executable.
1957 A language processor that would prefer to have unneeded
1958 static constants "optimized away" would just defer writing
1959 them out until here. E.g. C++ does this, because static
1960 constants are often defined in header files.
1962 ??? A tempting alternative (for both C and C++) would be
1963 to force a constant to be written if and only if it is
1964 defined in a main file, as opposed to an include file. */
1966 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1967 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1968 && !DECL_COMDAT (decl
))
1970 && flag_keep_static_consts
1971 && !DECL_ARTIFICIAL (decl
))
1972 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1975 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1978 if (TREE_CODE (decl
) == FUNCTION_DECL
1979 && DECL_INITIAL (decl
) != 0
1980 && DECL_SAVED_INSNS (decl
) != 0
1981 && (flag_keep_inline_functions
1982 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1983 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1986 output_inline_function (decl
);
1991 output_something
= 1;
1995 return output_something
;
1998 /* Issue appropriate warnings for the global declarations in VEC (of
1999 which there are LEN). Output debugging information for them. */
2002 check_global_declarations (vec
, len
)
2009 for (i
= 0; i
< len
; i
++)
2013 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2014 && ! TREE_ASM_WRITTEN (decl
))
2015 /* Cancel the RTL for this decl so that, if debugging info
2016 output for global variables is still to come,
2017 this one will be omitted. */
2018 SET_DECL_RTL (decl
, NULL_RTX
);
2020 /* Warn about any function
2021 declared static but not defined.
2022 We don't warn about variables,
2023 because many programs have static variables
2024 that exist only to get some text into the object file. */
2025 if (TREE_CODE (decl
) == FUNCTION_DECL
2026 && (warn_unused_function
2027 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2028 && DECL_INITIAL (decl
) == 0
2029 && DECL_EXTERNAL (decl
)
2030 && ! DECL_ARTIFICIAL (decl
)
2031 && ! TREE_PUBLIC (decl
))
2033 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2034 pedwarn_with_decl (decl
,
2035 "`%s' used but never defined");
2037 warning_with_decl (decl
,
2038 "`%s' declared `static' but never defined");
2039 /* This symbol is effectively an "extern" declaration now. */
2040 TREE_PUBLIC (decl
) = 1;
2041 assemble_external (decl
);
2044 /* Warn about static fns or vars defined but not used,
2045 but not about inline functions or static consts
2046 since defining those in header files is normal practice. */
2047 if (((warn_unused_function
2048 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2049 || (warn_unused_variable
2050 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2051 && ! DECL_IN_SYSTEM_HEADER (decl
)
2052 && ! DECL_EXTERNAL (decl
)
2053 && ! TREE_PUBLIC (decl
)
2054 && ! TREE_USED (decl
)
2055 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2056 /* The TREE_USED bit for file-scope decls
2057 is kept in the identifier, to handle multiple
2058 external decls in different scopes. */
2059 && ! TREE_USED (DECL_NAME (decl
)))
2060 warning_with_decl (decl
, "`%s' defined but not used");
2062 timevar_push (TV_SYMOUT
);
2063 #ifdef SDB_DEBUGGING_INFO
2064 /* The COFF linker can move initialized global vars to the end.
2065 And that can screw up the symbol ordering.
2066 By putting the symbols in that order to begin with,
2067 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2068 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2069 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2070 && ! DECL_EXTERNAL (decl
)
2071 && DECL_RTL (decl
) != 0)
2072 sdbout_symbol (decl
, 0);
2074 /* Output COFF information for non-global
2075 file-scope initialized variables. */
2076 if (write_symbols
== SDB_DEBUG
2077 && TREE_CODE (decl
) == VAR_DECL
2078 && DECL_INITIAL (decl
)
2079 && ! DECL_EXTERNAL (decl
)
2080 && DECL_RTL (decl
) != 0
2081 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2082 sdbout_toplevel_data (decl
);
2083 #endif /* SDB_DEBUGGING_INFO */
2084 #ifdef DWARF_DEBUGGING_INFO
2085 /* Output DWARF information for file-scope tentative data object
2086 declarations, file-scope (extern) function declarations (which
2087 had no corresponding body) and file-scope tagged type declarations
2088 and definitions which have not yet been forced out. */
2090 if (write_symbols
== DWARF_DEBUG
2091 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2092 dwarfout_file_scope_decl (decl
, 1);
2094 #ifdef DWARF2_DEBUGGING_INFO
2095 /* Output DWARF2 information for file-scope tentative data object
2096 declarations, file-scope (extern) function declarations (which
2097 had no corresponding body) and file-scope tagged type declarations
2098 and definitions which have not yet been forced out. */
2100 if (write_symbols
== DWARF2_DEBUG
2101 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2102 dwarf2out_decl (decl
);
2104 timevar_pop (TV_SYMOUT
);
2108 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2109 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2110 INPUT_FILENAME and LINENO accordingly. */
2113 push_srcloc (file
, line
)
2117 struct file_stack
*fs
;
2119 if (input_file_stack
)
2121 input_file_stack
->name
= input_filename
;
2122 input_file_stack
->line
= lineno
;
2125 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2126 fs
->name
= input_filename
= file
;
2127 fs
->line
= lineno
= line
;
2128 fs
->indent_level
= 0;
2129 fs
->next
= input_file_stack
;
2130 input_file_stack
= fs
;
2131 input_file_stack_tick
++;
2134 /* Pop the top entry off the stack of presently open source files.
2135 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2141 struct file_stack
*fs
;
2143 fs
= input_file_stack
;
2144 input_file_stack
= fs
->next
;
2146 input_file_stack_tick
++;
2147 /* The initial source file is never popped. */
2148 if (!input_file_stack
)
2150 input_filename
= input_file_stack
->name
;
2151 lineno
= input_file_stack
->line
;
2154 /* Compile an entire file of output from cpp, named NAME.
2155 Write a file of assembly output and various debugging dumps. */
2163 int name_specified
= name
!= 0;
2165 if (dump_base_name
== 0)
2166 dump_base_name
= name
? name
: "gccdump";
2171 /* Start timing total execution time. */
2174 timevar_start (TV_TOTAL
);
2176 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2177 because then the driver will have provided the name of a temporary
2178 file or bit bucket for us. */
2180 if (! name_specified
&& asm_file_name
== 0)
2181 asm_out_file
= stdout
;
2184 if (asm_file_name
== 0)
2186 int len
= strlen (dump_base_name
);
2187 char *dumpname
= (char *) xmalloc (len
+ 6);
2188 memcpy (dumpname
, dump_base_name
, len
+ 1);
2189 strip_off_ending (dumpname
, len
);
2190 strcat (dumpname
, ".s");
2191 asm_file_name
= dumpname
;
2193 if (!strcmp (asm_file_name
, "-"))
2194 asm_out_file
= stdout
;
2196 asm_out_file
= fopen (asm_file_name
, "w");
2197 if (asm_out_file
== 0)
2198 fatal_io_error ("can't open %s for writing", asm_file_name
);
2201 /* Initialize data in various passes. */
2204 name
= init_parse (name
);
2205 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2206 || debug_info_level
== DINFO_LEVEL_VERBOSE
2207 || flag_test_coverage
2208 || warn_notreached
);
2211 init_decl_processing ();
2217 init_function_once ();
2218 init_stor_layout_once ();
2219 init_varasm_once ();
2220 init_EXPR_INSN_LIST_cache ();
2222 /* The following initialization functions need to generate rtl, so
2223 provide a dummy function context for them. */
2224 init_dummy_function_start ();
2227 if (flag_caller_saves
)
2228 init_caller_save ();
2229 expand_dummy_function_end ();
2231 /* If auxiliary info generation is desired, open the output file.
2232 This goes in the same directory as the source file--unlike
2233 all the other output files. */
2234 if (flag_gen_aux_info
)
2236 aux_info_file
= fopen (aux_info_file_name
, "w");
2237 if (aux_info_file
== 0)
2238 fatal_io_error ("can't open %s", aux_info_file_name
);
2241 #ifdef IO_BUFFER_SIZE
2242 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2243 _IOFBF
, IO_BUFFER_SIZE
);
2247 name
= ggc_strdup (name
);
2249 input_filename
= name
;
2251 /* Put an entry on the input file stack for the main input file. */
2252 push_srcloc (input_filename
, 0);
2254 /* Perform language-specific initialization.
2255 This may set main_input_filename. */
2256 if (lang_hooks
.init
)
2257 (*lang_hooks
.init
) ();
2259 /* If the input doesn't start with a #line, use the input name
2260 as the official input file name. */
2261 if (main_input_filename
== 0)
2262 main_input_filename
= name
;
2264 if (flag_syntax_only
)
2266 write_symbols
= NO_DEBUG
;
2268 profile_block_flag
= 0;
2272 ASM_FILE_START (asm_out_file
);
2274 #ifdef ASM_COMMENT_START
2275 if (flag_verbose_asm
)
2277 /* Print the list of options in effect. */
2278 print_version (asm_out_file
, ASM_COMMENT_START
);
2279 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2280 ASM_COMMENT_START
, " ", "\n");
2281 /* Add a blank line here so it appears in assembler output but not
2283 fprintf (asm_out_file
, "\n");
2286 } /* ! flag_syntax_only */
2288 #ifndef ASM_OUTPUT_SECTION_NAME
2289 if (flag_function_sections
)
2291 warning ("-ffunction-sections not supported for this target.");
2292 flag_function_sections
= 0;
2294 if (flag_data_sections
)
2296 warning ("-fdata-sections not supported for this target.");
2297 flag_data_sections
= 0;
2301 if (flag_function_sections
2302 && (profile_flag
|| profile_block_flag
))
2304 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2305 flag_function_sections
= 0;
2308 #ifndef OBJECT_FORMAT_ELF
2309 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2310 warning ("-ffunction-sections may affect debugging on some targets.");
2313 /* If dbx symbol table desired, initialize writing it
2314 and output the predefined types. */
2315 timevar_push (TV_SYMOUT
);
2316 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2317 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2318 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2320 #ifdef SDB_DEBUGGING_INFO
2321 if (write_symbols
== SDB_DEBUG
)
2322 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2324 #ifdef DWARF_DEBUGGING_INFO
2325 if (write_symbols
== DWARF_DEBUG
)
2326 dwarfout_init (asm_out_file
, main_input_filename
);
2328 #ifdef DWARF2_UNWIND_INFO
2329 if (dwarf2out_do_frame ())
2330 dwarf2out_frame_init ();
2332 #ifdef DWARF2_DEBUGGING_INFO
2333 if (write_symbols
== DWARF2_DEBUG
)
2334 dwarf2out_init (asm_out_file
, main_input_filename
);
2336 timevar_pop (TV_SYMOUT
);
2338 /* Initialize yet another pass. */
2340 init_final (main_input_filename
);
2341 init_branch_prob (dump_base_name
);
2343 timevar_push (TV_PARSE
);
2345 /* Call the parser, which parses the entire file
2346 (calling rest_of_compilation for each function). */
2348 if (yyparse () != 0)
2350 if (errorcount
== 0)
2351 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2353 /* In case there were missing closebraces,
2354 get us back to the global binding level. */
2355 while (! global_bindings_p ())
2359 /* Compilation is now finished except for writing
2360 what's left of the symbol table output. */
2362 timevar_pop (TV_PARSE
);
2364 if (flag_syntax_only
)
2367 globals
= getdecls ();
2369 /* Really define vars that have had only a tentative definition.
2370 Really output inline functions that must actually be callable
2371 and have not been output so far. */
2374 int len
= list_length (globals
);
2375 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2379 /* Process the decls in reverse order--earliest first.
2380 Put them into VEC from back to front, then take out from front. */
2382 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2383 vec
[len
- i
- 1] = decl
;
2385 wrapup_global_declarations (vec
, len
);
2387 /* This must occur after the loop to output deferred functions. Else
2388 the profiler initializer would not be emitted if all the functions
2389 in this compilation unit were deferred.
2391 output_func_start_profiler can not cause any additional functions or
2392 data to need to be output, so it need not be in the deferred function
2394 output_func_start_profiler ();
2396 check_global_declarations (vec
, len
);
2402 /* Write out any pending weak symbol declarations. */
2406 /* Do dbx symbols. */
2407 timevar_push (TV_SYMOUT
);
2408 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2409 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2410 dbxout_finish (asm_out_file
, main_input_filename
);
2413 #ifdef DWARF_DEBUGGING_INFO
2414 if (write_symbols
== DWARF_DEBUG
)
2418 #ifdef DWARF2_UNWIND_INFO
2419 if (dwarf2out_do_frame ())
2420 dwarf2out_frame_finish ();
2423 #ifdef DWARF2_DEBUGGING_INFO
2424 if (write_symbols
== DWARF2_DEBUG
)
2425 dwarf2out_finish ();
2427 timevar_pop (TV_SYMOUT
);
2429 /* Output some stuff at end of file if nec. */
2431 dw2_output_indirect_constants ();
2433 end_final (dump_base_name
);
2435 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2437 timevar_push (TV_DUMP
);
2438 open_dump_file (DFI_bp
, NULL
);
2442 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2443 timevar_pop (TV_DUMP
);
2447 ASM_FILE_END (asm_out_file
);
2450 /* Attach a special .ident directive to the end of the file to identify
2451 the version of GCC which compiled this code. The format of the .ident
2452 string is patterned after the ones produced by native SVR4 compilers. */
2455 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2456 IDENT_ASM_OP
, version_string
);
2459 /* Language-specific end of compilation actions. */
2461 if (lang_hooks
.finish
)
2462 (*lang_hooks
.finish
) ();
2464 /* Close the dump files. */
2466 if (flag_gen_aux_info
)
2468 fclose (aux_info_file
);
2470 unlink (aux_info_file_name
);
2473 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2475 timevar_push (TV_DUMP
);
2476 dump_combine_total_stats (rtl_dump_file
);
2477 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2478 timevar_pop (TV_DUMP
);
2481 /* Close non-debugging input and output files. Take special care to note
2482 whether fclose returns an error, since the pages might still be on the
2483 buffer chain while the file is open. */
2487 if (ferror (asm_out_file
) != 0)
2488 fatal_io_error ("error writing to %s", asm_file_name
);
2489 if (fclose (asm_out_file
) != 0)
2490 fatal_io_error ("error closing %s", asm_file_name
);
2492 /* Do whatever is necessary to finish printing the graphs. */
2493 if (graph_dump_format
!= no_graph
)
2497 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2498 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2503 sprintf (seq
, ".%02d.", i
);
2504 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2505 finish_graph_dump_file (dump_base_name
, suffix
);
2512 ggc_print_statistics ();
2513 stringpool_statistics ();
2516 /* Free up memory for the benefit of leak detectors. */
2519 /* Stop timing total execution time. */
2520 timevar_stop (TV_TOTAL
);
2522 /* Print the times. */
2524 timevar_print (stderr
);
2527 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2528 and TYPE_DECL nodes.
2530 This does nothing for local (non-static) variables, unless the
2531 variable is a register variable with an ASMSPEC. In that case, or
2532 if the variable is not an automatice, it sets up the RTL and
2533 outputs any assembler code (label definition, storage allocation
2534 and initialization).
2536 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2537 the assembler symbol name to be used. TOP_LEVEL is nonzero
2538 if this declaration is not within a function. */
2541 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2543 const char *asmspec
;
2547 /* Declarations of variables, and of functions defined elsewhere. */
2549 /* The most obvious approach, to put an #ifndef around where
2550 this macro is used, doesn't work since it's inside a macro call. */
2551 #ifndef ASM_FINISH_DECLARE_OBJECT
2552 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2555 /* Forward declarations for nested functions are not "external",
2556 but we need to treat them as if they were. */
2557 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2558 || TREE_CODE (decl
) == FUNCTION_DECL
)
2560 timevar_push (TV_VARCONST
);
2562 make_decl_rtl (decl
, asmspec
);
2563 /* Don't output anything
2564 when a tentative file-scope definition is seen.
2565 But at end of compilation, do output code for them. */
2566 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2567 assemble_variable (decl
, top_level
, at_end
, 0);
2568 if (decl
== last_assemble_variable_decl
)
2570 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2573 timevar_pop (TV_VARCONST
);
2575 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2577 if (decode_reg_name (asmspec
) >= 0)
2579 SET_DECL_RTL (decl
, NULL_RTX
);
2580 make_decl_rtl (decl
, asmspec
);
2584 error ("invalid register name `%s' for register variable", asmspec
);
2585 DECL_REGISTER (decl
) = 0;
2590 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2591 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2592 && TREE_CODE (decl
) == TYPE_DECL
)
2594 timevar_push (TV_SYMOUT
);
2595 dbxout_symbol (decl
, 0);
2596 timevar_pop (TV_SYMOUT
);
2599 #ifdef SDB_DEBUGGING_INFO
2600 else if (write_symbols
== SDB_DEBUG
&& top_level
2601 && TREE_CODE (decl
) == TYPE_DECL
)
2603 timevar_push (TV_SYMOUT
);
2604 sdbout_symbol (decl
, 0);
2605 timevar_pop (TV_SYMOUT
);
2610 /* Called after finishing a record, union or enumeral type. */
2613 rest_of_type_compilation (type
, toplev
)
2614 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2618 tree type ATTRIBUTE_UNUSED
;
2619 int toplev ATTRIBUTE_UNUSED
;
2622 timevar_push (TV_SYMOUT
);
2623 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2624 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2625 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2627 #ifdef SDB_DEBUGGING_INFO
2628 if (write_symbols
== SDB_DEBUG
)
2629 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2631 #ifdef DWARF2_DEBUGGING_INFO
2632 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2633 dwarf2out_decl (TYPE_STUB_DECL (type
));
2635 timevar_pop (TV_SYMOUT
);
2638 /* DECL is an inline function, whose body is present, but which is not
2639 being output at this point. (We're putting that off until we need
2640 to do it.) If there are any actions that need to take place,
2641 including the emission of debugging information for the function,
2642 this is where they should go. This function may be called by
2643 language-dependent code for front-ends that do not even generate
2644 RTL for functions that don't need to be put out. */
2647 note_deferral_of_defined_inline_function (decl
)
2648 tree decl ATTRIBUTE_UNUSED
;
2650 #ifdef DWARF_DEBUGGING_INFO
2651 /* Generate the DWARF info for the "abstract" instance of a function
2652 which we may later generate inlined and/or out-of-line instances
2654 if (write_symbols
== DWARF_DEBUG
2655 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2656 && ! DECL_ABSTRACT_ORIGIN (decl
))
2658 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2659 DWARF code expects it to be set in this case. Intuitively,
2660 DECL is the function we just finished defining, so setting
2661 CURRENT_FUNCTION_DECL is sensible. */
2662 tree saved_cfd
= current_function_decl
;
2663 int was_abstract
= DECL_ABSTRACT (decl
);
2664 current_function_decl
= decl
;
2666 /* Let the DWARF code do its work. */
2667 set_decl_abstract_flags (decl
, 1);
2668 dwarfout_file_scope_decl (decl
, 0);
2670 set_decl_abstract_flags (decl
, 0);
2672 /* Reset CURRENT_FUNCTION_DECL. */
2673 current_function_decl
= saved_cfd
;
2678 /* FNDECL is an inline function which is about to be emitted out of line.
2679 Do any preparation, such as emitting abstract debug info for the inline
2680 before it gets mangled by optimization. */
2683 note_outlining_of_inline_function (fndecl
)
2684 tree fndecl ATTRIBUTE_UNUSED
;
2686 #ifdef DWARF2_DEBUGGING_INFO
2687 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2688 the abstract description of inline functions until something tries to
2689 reference them. Force it out now, before optimizations mangle the
2691 if (write_symbols
== DWARF2_DEBUG
)
2692 dwarf2out_abstract_function (fndecl
);
2696 /* This is called from finish_function (within yyparse)
2697 after each top-level definition is parsed.
2698 It is supposed to compile that function or variable
2699 and output the assembler code for it.
2700 After we return, the tree storage is freed. */
2703 rest_of_compilation (decl
)
2709 int rebuild_label_notes_after_reload
;
2710 int register_life_up_to_date
;
2712 timevar_push (TV_REST_OF_COMPILATION
);
2714 /* Now that we're out of the frontend, we shouldn't have any more
2715 CONCATs anywhere. */
2716 generating_concat_p
= 0;
2718 /* When processing delayed functions, prepare_function_start() won't
2719 have been run to re-initialize it. */
2720 cse_not_expected
= ! optimize
;
2722 /* First, make sure that NOTE_BLOCK is set correctly for each
2723 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2724 if (!cfun
->x_whole_function_mode_p
)
2727 /* Then remove any notes we don't need. That will make iterating
2728 over the instruction sequence faster, and allow the garbage
2729 collector to reclaim the memory used by the notes. */
2730 remove_unnecessary_notes ();
2732 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2733 tree in sensible shape. So, we just recalculate it here. */
2734 if (cfun
->x_whole_function_mode_p
)
2739 /* If we are reconsidering an inline function
2740 at the end of compilation, skip the stuff for making it inline. */
2742 if (DECL_SAVED_INSNS (decl
) == 0)
2748 /* If this is nested inside an inlined external function, pretend
2749 it was only declared. Since we cannot inline such functions,
2750 generating code for this one is not only not necessary but will
2751 confuse some debugging output writers. */
2752 for (parent
= DECL_CONTEXT (current_function_decl
);
2753 parent
!= NULL_TREE
;
2754 parent
= get_containing_scope (parent
))
2755 if (TREE_CODE (parent
) == FUNCTION_DECL
2756 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2758 DECL_INITIAL (decl
) = 0;
2759 goto exit_rest_of_compilation
;
2762 /* If requested, consider whether to make this function inline. */
2763 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2764 || flag_inline_functions
)
2766 timevar_push (TV_INTEGRATION
);
2767 lose
= function_cannot_inline_p (decl
);
2768 timevar_pop (TV_INTEGRATION
);
2769 if (lose
|| ! optimize
)
2771 if (warn_inline
&& DECL_INLINE (decl
))
2772 warning_with_decl (decl
, lose
);
2773 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2774 /* Don't really compile an extern inline function.
2775 If we can't make it inline, pretend
2776 it was only declared. */
2777 if (DECL_EXTERNAL (decl
))
2779 DECL_INITIAL (decl
) = 0;
2780 goto exit_rest_of_compilation
;
2784 /* ??? Note that this has the effect of making it look
2785 like "inline" was specified for a function if we choose
2786 to inline it. This isn't quite right, but it's
2787 probably not worth the trouble to fix. */
2788 inlinable
= DECL_INLINE (decl
) = 1;
2791 insns
= get_insns ();
2793 /* Dump the rtl code if we are dumping rtl. */
2795 if (open_dump_file (DFI_rtl
, decl
))
2797 if (DECL_SAVED_INSNS (decl
))
2798 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2799 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2802 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2803 sorts of eh initialization. Delay this until after the
2804 initial rtl dump so that we can see the original nesting. */
2805 convert_from_eh_region_ranges ();
2807 /* If function is inline, and we don't yet know whether to
2808 compile it by itself, defer decision till end of compilation.
2809 finish_compilation will call rest_of_compilation again
2810 for those functions that need to be output. Also defer those
2811 functions that we are supposed to defer. */
2814 || (DECL_INLINE (decl
)
2815 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2816 && ! flag_keep_inline_functions
)
2817 || DECL_EXTERNAL (decl
))))
2818 DECL_DEFER_OUTPUT (decl
) = 1;
2820 if (DECL_INLINE (decl
))
2821 /* DWARF wants seperate debugging info for abstract and
2822 concrete instances of all inline functions, including those
2823 declared inline but not inlined, and those inlined even
2824 though they weren't declared inline. Conveniently, that's
2825 what DECL_INLINE means at this point. */
2826 note_deferral_of_defined_inline_function (decl
);
2828 if (DECL_DEFER_OUTPUT (decl
))
2830 /* If -Wreturn-type, we have to do a bit of compilation. We just
2831 want to call jump_optimize to figure out whether or not we can
2832 fall off the end of the function; we do the minimum amount of
2833 work necessary to make that safe. And, we set optimize to zero
2834 to keep jump_optimize from working too hard. */
2835 if (warn_return_type
)
2837 int saved_optimize
= optimize
;
2840 find_exception_handler_labels ();
2841 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2842 !JUMP_AFTER_REGSCAN
);
2843 optimize
= saved_optimize
;
2846 current_function_nothrow
= nothrow_function_p ();
2847 if (current_function_nothrow
)
2848 /* Now we know that this can't throw; set the flag for the benefit
2849 of other functions later in this translation unit. */
2850 TREE_NOTHROW (current_function_decl
) = 1;
2852 timevar_push (TV_INTEGRATION
);
2853 save_for_inline (decl
);
2854 timevar_pop (TV_INTEGRATION
);
2855 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2856 goto exit_rest_of_compilation
;
2859 /* If specified extern inline but we aren't inlining it, we are
2860 done. This goes for anything that gets here with DECL_EXTERNAL
2861 set, not just things with DECL_INLINE. */
2862 if (DECL_EXTERNAL (decl
))
2863 goto exit_rest_of_compilation
;
2868 /* Initialize some variables used by the optimizers. */
2869 init_function_for_compilation ();
2871 if (! DECL_DEFER_OUTPUT (decl
))
2872 TREE_ASM_WRITTEN (decl
) = 1;
2874 /* Now that integrate will no longer see our rtl, we need not
2875 distinguish between the return value of this function and the
2876 return value of called functions. Also, we can remove all SETs
2877 of subregs of hard registers; they are only here because of
2879 rtx_equal_function_value_matters
= 0;
2880 purge_hard_subreg_sets (get_insns ());
2882 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2883 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2884 goto exit_rest_of_compilation
;
2886 /* We may have potential sibling or tail recursion sites. Select one
2887 (of possibly multiple) methods of performing the call. */
2888 if (flag_optimize_sibling_calls
)
2890 timevar_push (TV_JUMP
);
2891 open_dump_file (DFI_sibling
, decl
);
2893 optimize_sibling_and_tail_recursive_calls ();
2895 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2896 timevar_pop (TV_JUMP
);
2899 /* Complete generation of exception handling code. */
2900 find_exception_handler_labels ();
2903 timevar_push (TV_JUMP
);
2904 open_dump_file (DFI_eh
, decl
);
2906 finish_eh_generation ();
2908 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2909 timevar_pop (TV_JUMP
);
2913 /* If we are doing position-independent code generation, now
2914 is the time to output special prologues and epilogues.
2915 We do not want to do this earlier, because it just clutters
2916 up inline functions with meaningless insns. */
2921 insns
= get_insns ();
2923 /* Copy any shared structure that should not be shared. */
2924 unshare_all_rtl (current_function_decl
, insns
);
2926 #ifdef SETJMP_VIA_SAVE_AREA
2927 /* This must be performed before virutal register instantiation. */
2928 if (current_function_calls_alloca
)
2929 optimize_save_area_alloca (insns
);
2932 /* Instantiate all virtual registers. */
2933 instantiate_virtual_regs (current_function_decl
, insns
);
2935 open_dump_file (DFI_jump
, decl
);
2937 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2938 are initialized and to compute whether control can drop off the end
2941 timevar_push (TV_JUMP
);
2942 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2943 before jump optimization switches branch directions. */
2944 expected_value_to_br_prob ();
2946 reg_scan (insns
, max_reg_num (), 0);
2947 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2948 JUMP_AFTER_REGSCAN
);
2950 timevar_pop (TV_JUMP
);
2952 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2953 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2955 close_dump_file (DFI_jump
, print_rtl
, insns
);
2956 goto exit_rest_of_compilation
;
2959 timevar_push (TV_JUMP
);
2963 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2966 /* ??? Run if-conversion before delete_null_pointer_checks,
2967 since the later does not preserve the CFG. This should
2968 be changed -- no since converting if's that are going to
2970 timevar_push (TV_IFCVT
);
2972 timevar_pop (TV_IFCVT
);
2974 /* Try to identify useless null pointer tests and delete them. */
2975 if (flag_delete_null_pointer_checks
)
2976 delete_null_pointer_checks (insns
);
2979 /* Jump optimization, and the removal of NULL pointer checks, may
2980 have reduced the number of instructions substantially. CSE, and
2981 future passes, allocate arrays whose dimensions involve the
2982 maximum instruction UID, so if we can reduce the maximum UID
2983 we'll save big on memory. */
2984 renumber_insns (rtl_dump_file
);
2985 timevar_pop (TV_JUMP
);
2987 close_dump_file (DFI_jump
, print_rtl
, insns
);
2991 /* Perform common subexpression elimination.
2992 Nonzero value from `cse_main' means that jumps were simplified
2993 and some code may now be unreachable, so do
2994 jump optimization again. */
2998 open_dump_file (DFI_cse
, decl
);
2999 timevar_push (TV_CSE
);
3001 reg_scan (insns
, max_reg_num (), 1);
3003 if (flag_thread_jumps
)
3005 timevar_push (TV_JUMP
);
3006 thread_jumps (insns
, max_reg_num (), 1);
3007 timevar_pop (TV_JUMP
);
3010 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3012 /* If we are not running more CSE passes, then we are no longer
3013 expecting CSE to be run. But always rerun it in a cheap mode. */
3014 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3016 if (tem
|| optimize
> 1)
3018 timevar_push (TV_JUMP
);
3019 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3020 !JUMP_AFTER_REGSCAN
);
3021 timevar_pop (TV_JUMP
);
3024 /* Run this after jump optmizations remove all the unreachable code
3025 so that unreachable code will not keep values live. */
3026 delete_trivially_dead_insns (insns
, max_reg_num ());
3028 /* Try to identify useless null pointer tests and delete them. */
3029 if (flag_delete_null_pointer_checks
)
3031 timevar_push (TV_JUMP
);
3032 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3036 delete_null_pointer_checks (insns
);
3037 timevar_pop (TV_JUMP
);
3040 /* The second pass of jump optimization is likely to have
3041 removed a bunch more instructions. */
3042 renumber_insns (rtl_dump_file
);
3044 timevar_pop (TV_CSE
);
3045 close_dump_file (DFI_cse
, print_rtl
, insns
);
3048 open_dump_file (DFI_addressof
, decl
);
3050 purge_addressof (insns
);
3051 reg_scan (insns
, max_reg_num (), 1);
3053 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3057 if (optimize
> 0 && flag_ssa
)
3059 /* Convert to SSA form. */
3061 timevar_push (TV_TO_SSA
);
3062 open_dump_file (DFI_ssa
, decl
);
3064 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3068 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3069 timevar_pop (TV_TO_SSA
);
3071 /* The SSA implementation uses basic block numbers in its phi
3072 nodes. Thus, changing the control-flow graph or the basic
3073 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3074 may cause problems. */
3078 /* Remove dead code. */
3080 timevar_push (TV_DEAD_CODE_ELIM
);
3081 open_dump_file (DFI_dce
, decl
);
3083 insns
= get_insns ();
3084 eliminate_dead_code();
3086 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3087 timevar_pop (TV_DEAD_CODE_ELIM
);
3090 /* Convert from SSA form. */
3092 timevar_push (TV_FROM_SSA
);
3093 open_dump_file (DFI_ussa
, decl
);
3095 convert_from_ssa ();
3096 /* New registers have been created. Rescan their usage. */
3097 reg_scan (insns
, max_reg_num (), 1);
3098 /* Life analysis used in SSA adds log_links but these
3099 shouldn't be there until the flow stage, so clear
3101 clear_log_links (insns
);
3103 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3104 timevar_pop (TV_FROM_SSA
);
3109 /* Perform global cse. */
3111 if (optimize
> 0 && flag_gcse
)
3113 int save_csb
, save_cfj
;
3116 timevar_push (TV_GCSE
);
3117 open_dump_file (DFI_gcse
, decl
);
3119 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3121 tem
= gcse_main (insns
, rtl_dump_file
);
3123 save_csb
= flag_cse_skip_blocks
;
3124 save_cfj
= flag_cse_follow_jumps
;
3125 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3127 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3129 if (flag_expensive_optimizations
)
3131 timevar_push (TV_CSE
);
3132 reg_scan (insns
, max_reg_num (), 1);
3133 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3134 timevar_pop (TV_CSE
);
3135 cse_not_expected
= !flag_rerun_cse_after_loop
;
3138 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3139 things up. Then possibly re-run CSE again. */
3143 timevar_push (TV_JUMP
);
3144 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3145 !JUMP_AFTER_REGSCAN
);
3146 timevar_pop (TV_JUMP
);
3148 if (flag_expensive_optimizations
)
3150 timevar_push (TV_CSE
);
3151 reg_scan (insns
, max_reg_num (), 1);
3152 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3153 timevar_pop (TV_CSE
);
3157 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3158 timevar_pop (TV_GCSE
);
3161 flag_cse_skip_blocks
= save_csb
;
3162 flag_cse_follow_jumps
= save_cfj
;
3165 /* Move constant computations out of loops. */
3169 timevar_push (TV_LOOP
);
3170 open_dump_file (DFI_loop
, decl
);
3172 if (flag_rerun_loop_opt
)
3174 /* We only want to perform unrolling once. */
3176 loop_optimize (insns
, rtl_dump_file
, 0);
3178 /* The first call to loop_optimize makes some instructions
3179 trivially dead. We delete those instructions now in the
3180 hope that doing so will make the heuristics in loop work
3181 better and possibly speed up compilation. */
3182 delete_trivially_dead_insns (insns
, max_reg_num ());
3184 /* The regscan pass is currently necessary as the alias
3185 analysis code depends on this information. */
3186 reg_scan (insns
, max_reg_num (), 1);
3188 loop_optimize (insns
, rtl_dump_file
,
3189 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3191 close_dump_file (DFI_loop
, print_rtl
, insns
);
3192 timevar_pop (TV_LOOP
);
3199 timevar_push (TV_CSE2
);
3200 open_dump_file (DFI_cse2
, decl
);
3202 if (flag_rerun_cse_after_loop
)
3204 /* Running another jump optimization pass before the second
3205 cse pass sometimes simplifies the RTL enough to allow
3206 the second CSE pass to do a better job. Jump_optimize can change
3207 max_reg_num so we must rerun reg_scan afterwards.
3208 ??? Rework to not call reg_scan so often. */
3209 timevar_push (TV_JUMP
);
3211 /* The previous call to loop_optimize makes some instructions
3212 trivially dead. We delete those instructions now in the
3213 hope that doing so will make the heuristics in jump work
3214 better and possibly speed up compilation. */
3215 delete_trivially_dead_insns (insns
, max_reg_num ());
3217 reg_scan (insns
, max_reg_num (), 0);
3218 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3219 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3221 timevar_push (TV_IFCVT
);
3223 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3227 timevar_pop(TV_IFCVT
);
3229 timevar_pop (TV_JUMP
);
3231 reg_scan (insns
, max_reg_num (), 0);
3232 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3236 timevar_push (TV_JUMP
);
3237 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3238 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3239 timevar_pop (TV_JUMP
);
3243 if (flag_thread_jumps
)
3245 /* This pass of jump threading straightens out code
3246 that was kinked by loop optimization. */
3247 timevar_push (TV_JUMP
);
3248 reg_scan (insns
, max_reg_num (), 0);
3249 thread_jumps (insns
, max_reg_num (), 0);
3250 timevar_pop (TV_JUMP
);
3253 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3254 timevar_pop (TV_CSE2
);
3259 cse_not_expected
= 1;
3263 /* Do control and data flow analysis; wrote some of the results to
3266 timevar_push (TV_FLOW
);
3267 open_dump_file (DFI_cfg
, decl
);
3269 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3271 check_function_return_warnings ();
3273 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3275 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3277 timevar_push (TV_BRANCH_PROB
);
3278 open_dump_file (DFI_bp
, decl
);
3282 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3283 timevar_pop (TV_BRANCH_PROB
);
3286 open_dump_file (DFI_life
, decl
);
3291 /* Discover and record the loop depth at the head of each basic
3292 block. The loop infrastructure does the real job for us. */
3293 flow_loops_find (&loops
, LOOP_TREE
);
3295 /* Estimate using heuristics if no profiling info is available. */
3296 if (flag_guess_branch_prob
)
3297 estimate_probability (&loops
);
3300 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3302 flow_loops_free (&loops
);
3304 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3305 mark_constant_function ();
3306 timevar_pop (TV_FLOW
);
3308 register_life_up_to_date
= 1;
3311 if (warn_uninitialized
|| extra_warnings
)
3313 uninitialized_vars_warning (DECL_INITIAL (decl
));
3315 setjmp_args_warning ();
3318 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3322 /* If -opt, try combining insns through substitution. */
3326 int rebuild_jump_labels_after_combine
= 0;
3328 timevar_push (TV_COMBINE
);
3329 open_dump_file (DFI_combine
, decl
);
3331 rebuild_jump_labels_after_combine
3332 = combine_instructions (insns
, max_reg_num ());
3334 /* Combining insns may have turned an indirect jump into a
3335 direct jump. Rebuid the JUMP_LABEL fields of jumping
3337 if (rebuild_jump_labels_after_combine
)
3339 timevar_push (TV_JUMP
);
3340 rebuild_jump_labels (insns
);
3341 timevar_pop (TV_JUMP
);
3343 timevar_push (TV_FLOW
);
3344 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3347 /* Blimey. We've got to have the CFG up to date for the call to
3348 if_convert below. However, the random deletion of blocks
3349 without updating life info can wind up with Wierd Stuff in
3350 global_live_at_end. We then run sched1, which updates things
3351 properly, discovers the wierdness and aborts. */
3352 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3353 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3354 | PROP_SCAN_DEAD_CODE
);
3356 timevar_pop (TV_FLOW
);
3359 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3360 timevar_pop (TV_COMBINE
);
3365 /* Rerun if-conversion, as combine may have simplified things enough to
3366 now meet sequence length restrictions. */
3369 timevar_push (TV_IFCVT
);
3370 open_dump_file (DFI_ce
, decl
);
3376 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3377 timevar_pop (TV_IFCVT
);
3380 /* Register allocation pre-pass, to reduce number of moves
3381 necessary for two-address machines. */
3382 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3384 timevar_push (TV_REGMOVE
);
3385 open_dump_file (DFI_regmove
, decl
);
3387 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3389 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3390 timevar_pop (TV_REGMOVE
);
3395 /* Any of the several passes since flow1 will have munged register
3396 lifetime data a bit. */
3398 register_life_up_to_date
= 0;
3400 #ifdef OPTIMIZE_MODE_SWITCHING
3401 timevar_push (TV_GCSE
);
3403 if (optimize_mode_switching (NULL
))
3405 /* We did work, and so had to regenerate global life information.
3406 Take advantage of this and don't re-recompute register life
3407 information below. */
3408 register_life_up_to_date
= 1;
3411 timevar_pop (TV_GCSE
);
3414 #ifdef INSN_SCHEDULING
3416 /* Print function header into sched dump now
3417 because doing the sched analysis makes some of the dump. */
3418 if (optimize
> 0 && flag_schedule_insns
)
3420 timevar_push (TV_SCHED
);
3421 open_dump_file (DFI_sched
, decl
);
3423 /* Do control and data sched analysis,
3424 and write some of the results to dump file. */
3426 schedule_insns (rtl_dump_file
);
3428 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3429 timevar_pop (TV_SCHED
);
3433 /* Register lifetime information was updated as part of verifying
3435 register_life_up_to_date
= 1;
3439 /* Determine if the current function is a leaf before running reload
3440 since this can impact optimizations done by the prologue and
3441 epilogue thus changing register elimination offsets. */
3442 current_function_is_leaf
= leaf_function_p ();
3444 timevar_push (TV_LOCAL_ALLOC
);
3445 open_dump_file (DFI_lreg
, decl
);
3447 /* Allocate pseudo-regs that are used only within 1 basic block.
3449 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3450 jump optimizer after register allocation and reloading are finished. */
3452 if (! register_life_up_to_date
)
3453 recompute_reg_usage (insns
, ! optimize_size
);
3454 regclass (insns
, max_reg_num (), rtl_dump_file
);
3455 rebuild_label_notes_after_reload
= local_alloc ();
3457 timevar_pop (TV_LOCAL_ALLOC
);
3459 if (dump_file
[DFI_lreg
].enabled
)
3461 timevar_push (TV_DUMP
);
3463 dump_flow_info (rtl_dump_file
);
3464 dump_local_alloc (rtl_dump_file
);
3466 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3467 timevar_pop (TV_DUMP
);
3472 timevar_push (TV_GLOBAL_ALLOC
);
3473 open_dump_file (DFI_greg
, decl
);
3475 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3476 pass fixing up any insns that are invalid. */
3479 failure
= global_alloc (rtl_dump_file
);
3482 build_insn_chain (insns
);
3483 failure
= reload (insns
, 0);
3486 timevar_pop (TV_GLOBAL_ALLOC
);
3488 if (dump_file
[DFI_greg
].enabled
)
3490 timevar_push (TV_DUMP
);
3492 dump_global_regs (rtl_dump_file
);
3494 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3495 timevar_pop (TV_DUMP
);
3499 goto exit_rest_of_compilation
;
3503 open_dump_file (DFI_postreload
, decl
);
3505 /* Do a very simple CSE pass over just the hard registers. */
3508 timevar_push (TV_RELOAD_CSE_REGS
);
3509 reload_cse_regs (insns
);
3510 timevar_pop (TV_RELOAD_CSE_REGS
);
3513 /* If optimizing, then go ahead and split insns now since we are about
3514 to recompute flow information anyway. Since we can't split insns after
3515 reload, do the splitting unconditionally here to avoid gcc from losing
3523 int old_labelnum
= max_label_num ();
3525 split_all_insns (0);
3526 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3529 /* Register allocation and reloading may have turned an indirect jump into
3530 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3531 jumping instructions. */
3532 if (rebuild_label_notes_after_reload
)
3534 timevar_push (TV_JUMP
);
3536 rebuild_jump_labels (insns
);
3538 timevar_pop (TV_JUMP
);
3541 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3543 /* Re-create the death notes which were deleted during reload. */
3544 timevar_push (TV_FLOW2
);
3545 open_dump_file (DFI_flow2
, decl
);
3547 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3548 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3549 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3551 /* On some machines, the prologue and epilogue code, or parts thereof,
3552 can be represented as RTL. Doing so lets us schedule insns between
3553 it and the rest of the code and also allows delayed branch
3554 scheduling to operate in the epilogue. */
3555 thread_prologue_and_epilogue_insns (insns
);
3560 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3562 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3563 even for machines with possibly nonzero RETURN_POPS_ARGS
3564 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3565 push instructions will have popping returns. */
3566 #ifndef PUSH_ROUNDING
3567 if (!ACCUMULATE_OUTGOING_ARGS
)
3569 combine_stack_adjustments ();
3574 flow2_completed
= 1;
3576 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3577 timevar_pop (TV_FLOW2
);
3579 #ifdef HAVE_peephole2
3580 if (optimize
> 0 && flag_peephole2
)
3582 timevar_push (TV_PEEPHOLE2
);
3583 open_dump_file (DFI_peephole2
, decl
);
3585 peephole2_optimize (rtl_dump_file
);
3587 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3588 timevar_pop (TV_PEEPHOLE2
);
3592 if (optimize
> 0 && flag_rename_registers
)
3594 timevar_push (TV_RENAME_REGISTERS
);
3595 open_dump_file (DFI_rnreg
, decl
);
3597 regrename_optimize ();
3599 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3600 timevar_pop (TV_RENAME_REGISTERS
);
3605 timevar_push (TV_IFCVT2
);
3606 open_dump_file (DFI_ce2
, decl
);
3610 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3611 timevar_pop (TV_IFCVT2
);
3614 #ifdef INSN_SCHEDULING
3615 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3617 timevar_push (TV_SCHED2
);
3618 open_dump_file (DFI_sched2
, decl
);
3620 /* Do control and data sched analysis again,
3621 and write some more of the results to dump file. */
3623 schedule_insns (rtl_dump_file
);
3625 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3626 timevar_pop (TV_SCHED2
);
3632 #ifdef LEAF_REGISTERS
3633 current_function_uses_only_leaf_regs
3634 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3637 if (optimize
> 0 && flag_reorder_blocks
)
3639 timevar_push (TV_REORDER_BLOCKS
);
3640 open_dump_file (DFI_bbro
, decl
);
3642 reorder_basic_blocks ();
3644 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3645 timevar_pop (TV_REORDER_BLOCKS
);
3648 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3649 Also do cross-jumping this time and delete no-op move insns. */
3653 timevar_push (TV_JUMP
);
3654 open_dump_file (DFI_jump2
, decl
);
3656 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3657 !JUMP_AFTER_REGSCAN
);
3659 /* CFG no longer kept up to date. */
3661 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3662 timevar_pop (TV_JUMP
);
3665 /* If a machine dependent reorganization is needed, call it. */
3666 #ifdef MACHINE_DEPENDENT_REORG
3667 open_dump_file (DFI_mach
, decl
);
3669 MACHINE_DEPENDENT_REORG (insns
);
3671 close_dump_file (DFI_mach
, print_rtl
, insns
);
3676 /* If a scheduling pass for delayed branches is to be done,
3677 call the scheduling code. */
3680 if (optimize
> 0 && flag_delayed_branch
)
3682 timevar_push (TV_DBR_SCHED
);
3683 open_dump_file (DFI_dbr
, decl
);
3685 dbr_schedule (insns
, rtl_dump_file
);
3687 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3688 timevar_pop (TV_DBR_SCHED
);
3695 /* ??? Do this before shorten branches so that we aren't creating
3696 insns too late and fail sanity checks in final. */
3697 convert_to_eh_region_ranges ();
3700 /* Shorten branches.
3702 Note this must run before reg-stack because of death note (ab)use
3703 in the ia32 backend. */
3704 timevar_push (TV_SHORTEN_BRANCH
);
3705 shorten_branches (get_insns ());
3706 timevar_pop (TV_SHORTEN_BRANCH
);
3709 timevar_push (TV_REG_STACK
);
3710 open_dump_file (DFI_stack
, decl
);
3712 reg_to_stack (insns
, rtl_dump_file
);
3714 close_dump_file (DFI_stack
, print_rtl
, insns
);
3715 timevar_pop (TV_REG_STACK
);
3719 convert_to_eh_region_ranges ();
3722 current_function_nothrow
= nothrow_function_p ();
3723 if (current_function_nothrow
)
3724 /* Now we know that this can't throw; set the flag for the benefit
3725 of other functions later in this translation unit. */
3726 TREE_NOTHROW (current_function_decl
) = 1;
3728 /* Now turn the rtl into assembler code. */
3730 timevar_push (TV_FINAL
);
3735 /* Get the function's name, as described by its RTL. This may be
3736 different from the DECL_NAME name used in the source file. */
3738 x
= DECL_RTL (decl
);
3739 if (GET_CODE (x
) != MEM
)
3742 if (GET_CODE (x
) != SYMBOL_REF
)
3744 fnname
= XSTR (x
, 0);
3746 assemble_start_function (decl
, fnname
);
3747 final_start_function (insns
, asm_out_file
, optimize
);
3748 final (insns
, asm_out_file
, optimize
, 0);
3749 final_end_function (insns
, asm_out_file
, optimize
);
3751 #ifdef IA64_UNWIND_INFO
3752 /* ??? The IA-64 ".handlerdata" directive must be issued before
3753 the ".endp" directive that closes the procedure descriptor. */
3754 output_function_exception_table ();
3757 assemble_end_function (decl
, fnname
);
3759 #ifndef IA64_UNWIND_INFO
3760 /* Otherwise, it feels unclean to switch sections in the middle. */
3761 output_function_exception_table ();
3765 fflush (asm_out_file
);
3767 /* Release all memory allocated by flow. */
3768 free_basic_block_vars (0);
3770 /* Release all memory held by regsets now. */
3771 regset_release_memory ();
3773 timevar_pop (TV_FINAL
);
3777 /* Write DBX symbols if requested. */
3779 /* Note that for those inline functions where we don't initially
3780 know for certain that we will be generating an out-of-line copy,
3781 the first invocation of this routine (rest_of_compilation) will
3782 skip over this code by doing a `goto exit_rest_of_compilation;'.
3783 Later on, finish_compilation will call rest_of_compilation again
3784 for those inline functions that need to have out-of-line copies
3785 generated. During that call, we *will* be routed past here. */
3787 timevar_push (TV_SYMOUT
);
3788 #ifdef DBX_DEBUGGING_INFO
3789 if (write_symbols
== DBX_DEBUG
)
3790 dbxout_function (decl
);
3793 #ifdef DWARF_DEBUGGING_INFO
3794 if (write_symbols
== DWARF_DEBUG
)
3795 dwarfout_file_scope_decl (decl
, 0);
3798 #ifdef DWARF2_DEBUGGING_INFO
3799 if (write_symbols
== DWARF2_DEBUG
)
3800 dwarf2out_decl (decl
);
3802 timevar_pop (TV_SYMOUT
);
3804 exit_rest_of_compilation
:
3806 /* In case the function was not output,
3807 don't leave any temporary anonymous types
3808 queued up for sdb output. */
3809 #ifdef SDB_DEBUGGING_INFO
3810 if (write_symbols
== SDB_DEBUG
)
3811 sdbout_types (NULL_TREE
);
3814 reload_completed
= 0;
3815 flow2_completed
= 0;
3818 timevar_push (TV_FINAL
);
3820 /* Clear out the insn_length contents now that they are no
3822 init_insn_lengths ();
3824 /* Clear out the real_constant_chain before some of the rtx's
3825 it runs through become garbage. */
3826 clear_const_double_mem ();
3828 /* Show no temporary slots allocated. */
3831 free_basic_block_vars (0);
3833 timevar_pop (TV_FINAL
);
3835 /* Make sure volatile mem refs aren't considered valid operands for
3836 arithmetic insns. We must call this here if this is a nested inline
3837 function, since the above code leaves us in the init_recog state
3838 (from final.c), and the function context push/pop code does not
3839 save/restore volatile_ok.
3841 ??? Maybe it isn't necessary for expand_start_function to call this
3842 anymore if we do it here? */
3844 init_recog_no_volatile ();
3846 /* We're done with this function. Free up memory if we can. */
3847 free_after_parsing (cfun
);
3848 if (! DECL_DEFER_OUTPUT (decl
))
3849 free_after_compilation (cfun
);
3854 timevar_pop (TV_REST_OF_COMPILATION
);
3864 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3865 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3866 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3867 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3868 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3869 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"));
3871 for (i
= ARRAY_SIZE (f_options
); i
--;)
3873 const char *description
= f_options
[i
].description
;
3875 if (description
!= NULL
&& * description
!= 0)
3876 printf (" -f%-21s %s\n",
3877 f_options
[i
].string
, _(description
));
3880 printf (_(" -O[number] Set optimisation level to [number]\n"));
3881 printf (_(" -Os Optimise for space rather than speed\n"));
3882 for (i
= sizeof (compiler_params
); i
--;)
3884 const char *description
= compiler_params
[i
].help
;
3885 const int length
= 21-strlen(compiler_params
[i
].option
);
3887 if (description
!= NULL
&& * description
!= 0)
3888 printf (" --param %s=<value>%.*s%s\n",
3889 compiler_params
[i
].option
,
3890 length
> 0 ? length
: 1, " ",
3893 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3894 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3895 printf (_(" -w Suppress warnings\n"));
3896 printf (_(" -W Enable extra warnings\n"));
3898 for (i
= ARRAY_SIZE (W_options
); i
--;)
3900 const char *description
= W_options
[i
].description
;
3902 if (description
!= NULL
&& * description
!= 0)
3903 printf (" -W%-21s %s\n",
3904 W_options
[i
].string
, _(description
));
3907 printf (_(" -Wunused Enable unused warnings\n"));
3908 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3909 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3910 printf (_(" -p Enable function profiling\n"));
3911 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3912 printf (_(" -a Enable block profiling \n"));
3914 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3915 printf (_(" -ax Enable jump profiling \n"));
3917 printf (_(" -o <file> Place output into <file> \n"));
3919 -G <number> Put global and static data smaller than <number>\n\
3920 bytes into a special section (on some targets)\n"));
3922 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3924 if (debug_args
[i
].description
!= NULL
)
3925 printf (" -g%-21s %s\n",
3926 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3929 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3930 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3931 printf (_(" -version Display the compiler's version\n"));
3932 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3933 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3934 #if defined INSN_SCHEDULING
3935 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3937 printf (_(" --help Display this information\n"));
3942 /* Display descriptions of language specific options.
3943 If there is no description, note that there is an undocumented option.
3944 If the description is empty, do not display anything. (This allows
3945 options to be deliberately undocumented, for whatever reason).
3946 If the option string is missing, then this is a marker, indicating
3947 that the description string is in fact the name of a language, whose
3948 language specific options are to follow. */
3950 if (ARRAY_SIZE (documented_lang_options
) > 1)
3952 printf (_("\nLanguage specific options:\n"));
3954 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3956 const char *description
= documented_lang_options
[i
].description
;
3957 const char *option
= documented_lang_options
[i
].option
;
3959 if (description
== NULL
)
3964 printf (_(" %-23.23s [undocumented]\n"), option
);
3966 else if (*description
== 0)
3968 else if (option
== NULL
)
3972 (_("\nThere are undocumented %s specific options as well.\n"),
3976 printf (_("\n Options for %s:\n"), description
);
3981 printf (" %-23.23s %s\n", option
, _(description
));
3986 printf (_("\nThere are undocumented %s specific options as well.\n"),
3989 display_target_options ();
3993 display_target_options ()
3997 if (ARRAY_SIZE (target_switches
) > 1
3998 #ifdef TARGET_OPTIONS
3999 || ARRAY_SIZE (target_options
) > 1
4007 printf (_("\nTarget specific options:\n"));
4009 for (i
= ARRAY_SIZE (target_switches
); i
--;)
4011 const char *option
= target_switches
[i
].name
;
4012 const char *description
= target_switches
[i
].description
;
4014 if (option
== NULL
|| *option
== 0)
4016 else if (description
== NULL
)
4021 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4023 else if (* description
!= 0)
4024 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4027 #ifdef TARGET_OPTIONS
4028 for (i
= ARRAY_SIZE (target_options
); i
--;)
4030 const char *option
= target_options
[i
].prefix
;
4031 const char *description
= target_options
[i
].description
;
4033 if (option
== NULL
|| *option
== 0)
4035 else if (description
== NULL
)
4040 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4042 else if (* description
!= 0)
4043 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4049 printf (_("\nThere are undocumented target specific options as well.\n"));
4051 printf (_(" They exist, but they are not documented.\n"));
4056 /* Parse a -d... comand line switch. */
4059 decode_d_option (arg
)
4068 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4069 dump_file
[i
].enabled
= 1;
4075 flag_print_asm_name
= 1;
4078 flag_dump_rtl_in_asm
= 1;
4079 flag_print_asm_name
= 1;
4082 graph_dump_format
= vcg
;
4085 rtl_dump_and_exit
= 1;
4090 case 'D': /* These are handled by the preprocessor. */
4096 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4097 if (c
== dump_file
[i
].debug_switch
)
4099 dump_file
[i
].enabled
= 1;
4104 warning ("unrecognized gcc debugging option: %c", c
);
4109 /* Parse a -f... comand line switch. ARG is the value after the -f.
4110 It is safe to access 'ARG - 2' to generate the full switch name.
4111 Return the number of strings consumed. */
4114 decode_f_option (arg
)
4118 const char *option_value
= NULL
;
4120 /* Search for the option in the table of binary f options. */
4121 for (j
= ARRAY_SIZE (f_options
); j
--;)
4123 if (!strcmp (arg
, f_options
[j
].string
))
4125 *f_options
[j
].variable
= f_options
[j
].on_value
;
4129 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4130 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4132 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4137 if (!strcmp (arg
, "fast-math"))
4138 set_fast_math_flags();
4139 else if (!strcmp (arg
, "no-fast-math"))
4140 set_no_fast_math_flags();
4141 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4142 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4145 read_integral_parameter (option_value
, arg
- 2,
4147 set_param_value ("max-inline-insns", val
);
4149 #ifdef INSN_SCHEDULING
4150 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4151 fix_sched_param ("verbose", option_value
);
4153 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4154 fix_register (option_value
, 1, 1);
4155 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4156 fix_register (option_value
, 0, 1);
4157 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4158 fix_register (option_value
, 0, 0);
4159 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4160 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4161 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4163 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4164 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4165 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4166 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4168 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4169 else if ((option_value
4170 = skip_leading_substring (arg
, "stack-limit-register=")))
4172 int reg
= decode_reg_name (option_value
);
4174 error ("unrecognized register name `%s'", option_value
);
4176 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4178 else if ((option_value
4179 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4182 nm
= ggc_strdup (option_value
);
4183 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4185 else if ((option_value
4186 = skip_leading_substring (arg
, "message-length=")))
4187 diagnostic_message_length_per_line
=
4188 read_integral_parameter (option_value
, arg
- 2,
4189 diagnostic_message_length_per_line
);
4190 else if ((option_value
4191 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4193 if (!strcmp (option_value
, "once"))
4194 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4195 else if (!strcmp (option_value
, "every-line"))
4196 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4198 error ("Unrecognized option `%s'", arg
- 2);
4200 else if (!strcmp (arg
, "no-stack-limit"))
4201 stack_limit_rtx
= NULL_RTX
;
4202 else if (!strcmp (arg
, "preprocessed"))
4203 /* Recognise this switch but do nothing. This prevents warnings
4204 about an unrecognized switch if cpplib has not been linked in. */
4212 /* Parse a -W... comand line switch. ARG is the value after the -W.
4213 It is safe to access 'ARG - 2' to generate the full switch name.
4214 Return the number of strings consumed. */
4217 decode_W_option (arg
)
4220 const char *option_value
= NULL
;
4223 /* Search for the option in the table of binary W options. */
4225 for (j
= ARRAY_SIZE (W_options
); j
--;)
4227 if (!strcmp (arg
, W_options
[j
].string
))
4229 *W_options
[j
].variable
= W_options
[j
].on_value
;
4233 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4234 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4236 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4241 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4243 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4245 if (id_clash_len
!= -1)
4248 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4250 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4252 warn_larger_than
= larger_than_size
!= -1;
4254 else if (!strcmp (arg
, "unused"))
4258 else if (!strcmp (arg
, "no-unused"))
4268 /* Parse a -g... comand line switch. ARG is the value after the -g.
4269 It is safe to access 'ARG - 2' to generate the full switch name.
4270 Return the number of strings consumed. */
4273 decode_g_option (arg
)
4277 /* A lot of code assumes write_symbols == NO_DEBUG if the
4278 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4279 of what debugging type has been selected). This records the
4280 selected type. It is an error to specify more than one
4282 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4283 /* Non-zero if debugging format has been explicitly set.
4284 -g and -ggdb don't explicitly set the debugging format so
4285 -gdwarf -g3 is equivalent to -gdwarf3. */
4286 static int type_explicitly_set_p
= 0;
4287 /* Indexed by enum debug_info_type. */
4288 static const char *debug_type_names
[] =
4290 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4293 /* The maximum admissible debug level value. */
4294 static const unsigned max_debug_level
= 3;
4296 /* Look up ARG in the table. */
4297 for (da
= debug_args
; da
->arg
; da
++)
4299 const int da_len
= strlen (da
->arg
);
4301 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4303 enum debug_info_type type
= da
->debug_type
;
4304 const char *p
= arg
+ da_len
;
4306 if (*p
&& (*p
< '0' || *p
> '9'))
4309 /* A debug flag without a level defaults to level 2.
4310 Note we do not want to call read_integral_parameter
4311 for that case since it will call atoi which
4314 ??? We may want to generalize the interface to
4315 read_integral_parameter to better handle this case
4316 if this case shows up often. */
4318 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4322 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4324 error ("use -gdwarf -g%d for DWARF v1, level %d",
4327 error ("use -gdwarf-2 for DWARF v2");
4330 if (level
> max_debug_level
)
4333 ignoring option `%s' due to invalid debug level specification",
4335 level
= debug_info_level
;
4338 if (type
== NO_DEBUG
)
4340 type
= PREFERRED_DEBUGGING_TYPE
;
4342 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4344 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4345 type
= DWARF2_DEBUG
;
4347 #ifdef DBX_DEBUGGING_INFO
4354 if (type
== NO_DEBUG
)
4355 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4357 /* Does it conflict with an already selected type? */
4358 if (type_explicitly_set_p
4359 /* -g/-ggdb don't conflict with anything. */
4360 && da
->debug_type
!= NO_DEBUG
4361 && type
!= selected_debug_type
)
4362 warning ("`%s' ignored, conflicts with `-g%s'",
4363 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4366 /* If the format has already been set, -g/-ggdb
4367 only change the debug level. */
4368 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4369 /* Don't change debugging type. */
4373 selected_debug_type
= type
;
4374 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4377 write_symbols
= (level
== 0
4379 : selected_debug_type
);
4380 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4381 debug_info_level
= (enum debug_info_level
) level
;
4394 /* Decode the first argument in the argv as a language-independent option.
4395 Return the number of strings consumed. */
4398 independent_decode_option (argc
, argv
)
4402 char *arg
= argv
[0];
4404 if (arg
[0] != '-' || arg
[1] == 0)
4416 if (!strcmp (arg
, "-help"))
4419 exit_after_options
= 1;
4422 if (!strcmp (arg
, "-target-help"))
4424 display_target_options ();
4425 exit_after_options
= 1;
4428 if (!strcmp (arg
, "-version"))
4430 print_version (stderr
, "");
4431 exit_after_options
= 1;
4434 /* Handle '--param <name>=<value>'. */
4435 if (strcmp (arg
, "-param") == 0)
4441 error ("-param option missing argument");
4445 /* Get the '<name>=<value>' parameter. */
4447 /* Look for the `='. */
4448 equal
= strchr (arg
, '=');
4450 error ("invalid --param option: %s", arg
);
4455 /* Zero out the `=' sign so that we get two separate strings. */
4457 /* Figure out what value is specified. */
4458 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4459 if (val
!= INVALID_PARAM_VAL
)
4460 set_param_value (arg
, val
);
4462 error ("invalid parameter value `%s'", equal
+ 1);
4477 /* Already been treated in main (). Do nothing. */
4481 set_target_switch (arg
+ 1);
4485 return decode_f_option (arg
+ 1);
4488 return decode_g_option (arg
+ 1);
4491 if (!strcmp (arg
, "dumpbase"))
4496 dump_base_name
= argv
[1];
4500 decode_d_option (arg
+ 1);
4504 if (!strcmp (arg
, "pedantic"))
4506 else if (!strcmp (arg
, "pedantic-errors"))
4507 flag_pedantic_errors
= pedantic
= 1;
4508 else if (arg
[1] == 0)
4515 if (!strcmp (arg
, "quiet"))
4522 if (!strcmp (arg
, "version"))
4530 inhibit_warnings
= 1;
4539 /* We save the value of warn_uninitialized, since if they put
4540 -Wuninitialized on the command line, we need to generate a
4541 warning about not using it without also specifying -O. */
4542 if (warn_uninitialized
!= 1)
4543 warn_uninitialized
= 2;
4546 return decode_W_option (arg
+ 1);
4552 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4553 warning ("`-a' option (basic block profile) not supported");
4555 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4558 else if (!strcmp (arg
, "ax"))
4560 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4561 warning ("`-ax' option (jump profiling) not supported");
4563 profile_block_flag
= (!profile_block_flag
4564 || profile_block_flag
== 2) ? 2 : 3;
4567 else if (!strncmp (arg
, "aux-info", 8))
4569 flag_gen_aux_info
= 1;
4575 aux_info_file_name
= argv
[1];
4579 aux_info_file_name
= arg
+ 8;
4591 asm_file_name
= argv
[1];
4606 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4611 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4615 if (g_switch_val
== -1)
4619 g_switch_set
= TRUE
;
4620 g_switch_value
= g_switch_val
;
4630 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4631 Decode command args, then call compile_file.
4632 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4633 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4635 It is not safe to call this function more than once. */
4638 toplev_main (argc
, argv
)
4645 /* save in case md file wants to emit args as a comment. */
4649 p
= argv
[0] + strlen (argv
[0]);
4650 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4654 xmalloc_set_program_name (progname
);
4656 /* LC_CTYPE determines the character set used by the terminal so it has be set
4657 to output messages correctly. */
4659 #ifdef HAVE_LC_MESSAGES
4660 setlocale (LC_CTYPE
, "");
4661 setlocale (LC_MESSAGES
, "");
4663 setlocale (LC_ALL
, "");
4666 (void) bindtextdomain (PACKAGE
, localedir
);
4667 (void) textdomain (PACKAGE
);
4669 /* Install handler for SIGFPE, which may be received while we do
4670 compile-time floating point arithmetic. */
4671 signal (SIGFPE
, float_signal
);
4673 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4675 signal (SIGSEGV
, crash_signal
);
4678 signal (SIGILL
, crash_signal
);
4681 signal (SIGBUS
, crash_signal
);
4684 signal (SIGABRT
, crash_signal
);
4686 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4687 signal (SIGIOT
, crash_signal
);
4690 decl_printable_name
= decl_name
;
4691 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4693 /* Initialize whether `char' is signed. */
4694 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4695 #ifdef DEFAULT_SHORT_ENUMS
4696 /* Initialize how much space enums occupy, by default. */
4697 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4700 /* Initialize the garbage-collector. */
4703 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4704 ggc_add_tree_root (¤t_function_decl
, 1);
4705 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4707 /* Initialize the diagnostics reporting machinery. */
4708 initialize_diagnostics ();
4710 /* Register the language-independent parameters. */
4711 add_params (lang_independent_params
, LAST_PARAM
);
4713 /* Perform language-specific options intialization. */
4714 if (lang_hooks
.init_options
)
4715 (*lang_hooks
.init_options
) ();
4717 /* Scan to see what optimization level has been specified. That will
4718 determine the default value of many flags. */
4719 for (i
= 1; i
< argc
; i
++)
4721 if (!strcmp (argv
[i
], "-O"))
4726 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4728 /* Handle -Os, -O2, -O3, -O69, ... */
4729 char *p
= &argv
[i
][2];
4731 if ((p
[0] == 's') && (p
[1] == 0))
4735 /* Optimizing for size forces optimize to be 2. */
4740 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4741 if (optimize_val
!= -1)
4743 optimize
= optimize_val
;
4753 flag_thread_jumps
= 1;
4755 flag_delayed_branch
= 1;
4757 #ifdef CAN_DEBUG_WITHOUT_FP
4758 flag_omit_frame_pointer
= 1;
4760 flag_guess_branch_prob
= 1;
4765 flag_optimize_sibling_calls
= 1;
4766 flag_cse_follow_jumps
= 1;
4767 flag_cse_skip_blocks
= 1;
4769 flag_expensive_optimizations
= 1;
4770 flag_strength_reduce
= 1;
4771 flag_rerun_cse_after_loop
= 1;
4772 flag_rerun_loop_opt
= 1;
4773 flag_caller_saves
= 1;
4776 #ifdef INSN_SCHEDULING
4777 flag_schedule_insns
= 1;
4778 flag_schedule_insns_after_reload
= 1;
4781 flag_strict_aliasing
= 1;
4782 flag_delete_null_pointer_checks
= 1;
4783 flag_reorder_blocks
= 1;
4788 flag_inline_functions
= 1;
4789 flag_rename_registers
= 1;
4792 if (optimize
< 2 || optimize_size
)
4797 align_functions
= 1;
4800 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4803 set_target_switch ("");
4805 /* Unwind tables are always present in an ABI-conformant IA-64
4806 object file, so the default should be ON. */
4807 #ifdef IA64_UNWIND_INFO
4808 flag_unwind_tables
= IA64_UNWIND_INFO
;
4811 #ifdef OPTIMIZATION_OPTIONS
4812 /* Allow default optimizations to be specified on a per-machine basis. */
4813 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4816 /* Initialize register usage now so switches may override. */
4819 /* Perform normal command line switch decoding. */
4820 for (i
= 1; i
< argc
;)
4823 int indep_processed
;
4825 /* Give the language a chance to decode the option for itself. */
4826 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4828 if (lang_processed
>= 0)
4829 /* Now see if the option also has a language independent meaning.
4830 Some options are both language specific and language independent,
4832 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4835 lang_processed
= -lang_processed
;
4836 indep_processed
= 0;
4839 if (lang_processed
|| indep_processed
)
4840 i
+= MAX (lang_processed
, indep_processed
);
4843 const char *option
= NULL
;
4844 const char *lang
= NULL
;
4847 /* It is possible that the command line switch is not valid for the
4848 current language, but it is valid for another language. In order
4849 to be compatible with previous versions of the compiler (which
4850 did not issue an error message in this case) we check for this
4851 possibility here. If we do find a match, then if extra_warnings
4852 is set we generate a warning message, otherwise we will just
4853 ignore the option. */
4854 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4856 option
= documented_lang_options
[j
].option
;
4859 lang
= documented_lang_options
[j
].description
;
4860 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4864 if (j
!= ARRAY_SIZE (documented_lang_options
))
4868 warning ("Ignoring command line option '%s'", argv
[i
]);
4871 ("(It is valid for %s but not the selected language)",
4875 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4876 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4878 error ("Unrecognized option `%s'", argv
[i
]);
4884 /* All command line options have been processed. */
4885 if (lang_hooks
.post_options
)
4886 (*lang_hooks
.post_options
) ();
4888 if (exit_after_options
)
4891 /* Reflect any language-specific diagnostic option setting. */
4892 reshape_diagnostic_buffer ();
4894 /* Checker uses the frame pointer. */
4895 if (flag_check_memory_usage
)
4896 flag_omit_frame_pointer
= 0;
4900 /* Inlining does not work if not optimizing,
4901 so force it not to be done. */
4905 /* The c_decode_option function and decode_option hook set
4906 this to `2' if -Wall is used, so we can avoid giving out
4907 lots of errors for people who don't realize what -Wall does. */
4908 if (warn_uninitialized
== 1)
4909 warning ("-Wuninitialized is not supported without -O");
4912 #ifdef OVERRIDE_OPTIONS
4913 /* Some machines may reject certain combinations of options. */
4917 /* Set up the align_*_log variables, defaulting them to 1 if they
4918 were still unset. */
4919 if (align_loops
<= 0) align_loops
= 1;
4920 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4921 if (align_jumps
<= 0) align_jumps
= 1;
4922 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4923 if (align_labels
<= 0) align_labels
= 1;
4924 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4925 if (align_functions
<= 0) align_functions
= 1;
4926 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4928 if (profile_block_flag
== 3)
4930 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4931 profile_block_flag
= 2;
4934 /* Unrolling all loops implies that standard loop unrolling must also
4936 if (flag_unroll_all_loops
)
4937 flag_unroll_loops
= 1;
4938 /* Loop unrolling requires that strength_reduction be on also. Silently
4939 turn on strength reduction here if it isn't already on. Also, the loop
4940 unrolling code assumes that cse will be run after loop, so that must
4941 be turned on also. */
4942 if (flag_unroll_loops
)
4944 flag_strength_reduce
= 1;
4945 flag_rerun_cse_after_loop
= 1;
4948 /* Warn about options that are not supported on this machine. */
4949 #ifndef INSN_SCHEDULING
4950 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4951 warning ("instruction scheduling not supported on this target machine");
4954 if (flag_delayed_branch
)
4955 warning ("this target machine does not have delayed branches");
4958 /* Some operating systems do not allow profiling without a frame
4960 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4962 && flag_omit_frame_pointer
)
4964 error ("profiling does not work without a frame pointer");
4965 flag_omit_frame_pointer
= 0;
4968 user_label_prefix
= USER_LABEL_PREFIX
;
4969 if (flag_leading_underscore
!= -1)
4971 /* If the default prefix is more complicated than "" or "_",
4972 issue a warning and ignore this option. */
4973 if (user_label_prefix
[0] == 0 ||
4974 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4976 user_label_prefix
= flag_leading_underscore
? "_" : "";
4979 warning ("-f%sleading-underscore not supported on this target machine",
4980 flag_leading_underscore
? "" : "no-");
4983 /* If we are in verbose mode, write out the version and maybe all the
4984 option flags in use. */
4987 print_version (stderr
, "");
4989 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4992 compile_file (filename
);
4995 return (FATAL_EXIT_CODE
);
4997 return (FATAL_EXIT_CODE
);
4998 return (SUCCESS_EXIT_CODE
);
5001 /* Decode -m switches. */
5002 /* Decode the switch -mNAME. */
5005 set_target_switch (name
)
5009 int valid_target_option
= 0;
5011 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5012 if (!strcmp (target_switches
[j
].name
, name
))
5014 if (target_switches
[j
].value
< 0)
5015 target_flags
&= ~-target_switches
[j
].value
;
5017 target_flags
|= target_switches
[j
].value
;
5018 valid_target_option
= 1;
5021 #ifdef TARGET_OPTIONS
5022 if (!valid_target_option
)
5023 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5025 int len
= strlen (target_options
[j
].prefix
);
5026 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5028 *target_options
[j
].variable
= name
+ len
;
5029 valid_target_option
= 1;
5034 if (!valid_target_option
)
5035 error ("Invalid option `%s'", name
);
5038 /* Print version information to FILE.
5039 Each line begins with INDENT (for the case where FILE is the
5040 assembler output file). */
5043 print_version (file
, indent
)
5048 #define __VERSION__ "[?]"
5052 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5054 "%s%s%s version %s (%s) compiled by CC.\n"
5056 , indent
, *indent
!= 0 ? " " : "",
5057 language_string
, version_string
, TARGET_NAME
,
5058 indent
, __VERSION__
);
5061 /* Print an option value and return the adjusted position in the line.
5062 ??? We don't handle error returns from fprintf (disk full); presumably
5063 other code will catch a disk full though. */
5066 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5069 const char *indent
, *sep
, *term
, *type
, *name
;
5071 /* The ultrix fprintf returns 0 on success, so compute the result we want
5072 here since we need it for the following test. */
5073 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5078 fprintf (file
, "%s", term
);
5083 fprintf (file
, "%s", indent
);
5084 pos
= strlen (indent
);
5086 fprintf (file
, "%s%s%s", sep
, type
, name
);
5091 /* Print active target switches to FILE.
5092 POS is the current cursor position and MAX is the size of a "line".
5093 Each line begins with INDENT and ends with TERM.
5094 Each switch is separated from the next by SEP. */
5097 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5100 const char *indent
, *sep
, *term
;
5105 /* Print the options as passed. */
5107 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5108 _("options passed: "), "");
5110 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5114 if (strcmp (*p
, "-o") == 0)
5120 if (strcmp (*p
, "-quiet") == 0)
5122 if (strcmp (*p
, "-version") == 0)
5127 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5130 fprintf (file
, "%s", term
);
5132 /* Print the -f and -m options that have been enabled.
5133 We don't handle language specific options but printing argv
5136 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5137 _("options enabled: "), "");
5139 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5140 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5141 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5142 "-f", f_options
[j
].string
);
5144 /* Print target specific options. */
5146 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5147 if (target_switches
[j
].name
[0] != '\0'
5148 && target_switches
[j
].value
> 0
5149 && ((target_switches
[j
].value
& target_flags
)
5150 == target_switches
[j
].value
))
5152 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5153 "-m", target_switches
[j
].name
);
5156 #ifdef TARGET_OPTIONS
5157 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5158 if (*target_options
[j
].variable
!= NULL
)
5161 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5162 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5163 prefix
, *target_options
[j
].variable
);
5167 fprintf (file
, "%s", term
);
5170 /* Record the beginning of a new source file, named FILENAME. */
5173 debug_start_source_file (filename
)
5174 register const char *filename ATTRIBUTE_UNUSED
;
5176 #ifdef DBX_DEBUGGING_INFO
5177 if (write_symbols
== DBX_DEBUG
)
5178 dbxout_start_new_source_file (filename
);
5180 #ifdef DWARF_DEBUGGING_INFO
5181 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5182 && write_symbols
== DWARF_DEBUG
)
5183 dwarfout_start_new_source_file (filename
);
5184 #endif /* DWARF_DEBUGGING_INFO */
5185 #ifdef DWARF2_DEBUGGING_INFO
5186 if (write_symbols
== DWARF2_DEBUG
)
5187 dwarf2out_start_source_file (filename
);
5188 #endif /* DWARF2_DEBUGGING_INFO */
5189 #ifdef SDB_DEBUGGING_INFO
5190 if (write_symbols
== SDB_DEBUG
)
5191 sdbout_start_new_source_file (filename
);
5195 /* Record the resumption of a source file. LINENO is the line number in
5196 the source file we are returning to. */
5199 debug_end_source_file (lineno
)
5200 register unsigned lineno ATTRIBUTE_UNUSED
;
5202 #ifdef DBX_DEBUGGING_INFO
5203 if (write_symbols
== DBX_DEBUG
)
5204 dbxout_resume_previous_source_file ();
5206 #ifdef DWARF_DEBUGGING_INFO
5207 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5208 && write_symbols
== DWARF_DEBUG
)
5209 dwarfout_resume_previous_source_file (lineno
);
5210 #endif /* DWARF_DEBUGGING_INFO */
5211 #ifdef DWARF2_DEBUGGING_INFO
5212 if (write_symbols
== DWARF2_DEBUG
)
5213 dwarf2out_end_source_file ();
5214 #endif /* DWARF2_DEBUGGING_INFO */
5215 #ifdef SDB_DEBUGGING_INFO
5216 if (write_symbols
== SDB_DEBUG
)
5217 sdbout_resume_previous_source_file ();
5221 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5222 the tail part of the directive line, i.e. the part which is past the
5223 initial whitespace, #, whitespace, directive-name, whitespace part. */
5226 debug_define (lineno
, buffer
)
5227 register unsigned lineno ATTRIBUTE_UNUSED
;
5228 register const char *buffer ATTRIBUTE_UNUSED
;
5230 #ifdef DWARF_DEBUGGING_INFO
5231 if (write_symbols
== DWARF_DEBUG
)
5232 dwarfout_define (lineno
, buffer
);
5233 #endif /* DWARF_DEBUGGING_INFO */
5234 #ifdef DWARF2_DEBUGGING_INFO
5235 if (write_symbols
== DWARF2_DEBUG
)
5236 dwarf2out_define (lineno
, buffer
);
5237 #endif /* DWARF2_DEBUGGING_INFO */
5240 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5241 the tail part of the directive line, i.e. the part which is past the
5242 initial whitespace, #, whitespace, directive-name, whitespace part. */
5245 debug_undef (lineno
, buffer
)
5246 register unsigned lineno ATTRIBUTE_UNUSED
;
5247 register const char *buffer ATTRIBUTE_UNUSED
;
5249 #ifdef DWARF_DEBUGGING_INFO
5250 if (write_symbols
== DWARF_DEBUG
)
5251 dwarfout_undef (lineno
, buffer
);
5252 #endif /* DWARF_DEBUGGING_INFO */
5253 #ifdef DWARF2_DEBUGGING_INFO
5254 if (write_symbols
== DWARF2_DEBUG
)
5255 dwarf2out_undef (lineno
, buffer
);
5256 #endif /* DWARF2_DEBUGGING_INFO */
5259 /* Returns nonzero if it is appropriate not to emit any debugging
5260 information for BLOCK, because it doesn't contain any instructions.
5261 This may not be the case for blocks containing nested functions, since
5262 we may actually call such a function even though the BLOCK information
5266 debug_ignore_block (block
)
5267 tree block ATTRIBUTE_UNUSED
;
5269 /* Never delete the BLOCK for the outermost scope
5270 of the function; we can refer to names from
5271 that scope even if the block notes are messed up. */
5272 if (is_body_block (block
))
5275 #ifdef DWARF2_DEBUGGING_INFO
5276 if (write_symbols
== DWARF2_DEBUG
)
5277 return dwarf2out_ignore_block (block
);