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 "Generate default debug format output" },
932 { "gdb", NO_DEBUG
, 1, "Generate default extended debug format output" },
933 #ifdef DBX_DEBUGGING_INFO
934 { "stabs", DBX_DEBUG
, 0, "Generate STABS format debug output" },
935 { "stabs+", DBX_DEBUG
, 1, "Generate extended STABS format debug output" },
937 #ifdef DWARF_DEBUGGING_INFO
938 { "dwarf", DWARF_DEBUG
, 0, "Generate DWARF-1 format debug output"},
939 { "dwarf+", DWARF_DEBUG
, 1,
940 "Generated extended DWARF-1 format debug output" },
942 #ifdef DWARF2_DEBUGGING_INFO
943 { "dwarf-2", DWARF2_DEBUG
, 0, "Enable DWARF-2 debug output" },
945 #ifdef XCOFF_DEBUGGING_INFO
946 { "xcoff", XCOFF_DEBUG
, 0, "Generate XCOFF format debug output" },
947 { "xcoff+", XCOFF_DEBUG
, 1, "Generate extended XCOFF format debug output" },
949 #ifdef SDB_DEBUGGING_INFO
950 { "coff", SDB_DEBUG
, 0, "Generate COFF format debug output" },
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 "Perform DWARF2 duplicate elimination"},
995 {"float-store", &flag_float_store
, 1,
996 "Do not store floats in registers" },
997 {"volatile", &flag_volatile
, 1,
998 "Consider all mem refs through pointers as volatile"},
999 {"volatile-global", &flag_volatile_global
, 1,
1000 "Consider all mem refs to global data to be volatile" },
1001 {"volatile-static", &flag_volatile_static
, 1,
1002 "Consider all mem refs to static data to be volatile" },
1003 {"defer-pop", &flag_defer_pop
, 1,
1004 "Defer popping functions args from stack until later" },
1005 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1006 "When possible do not generate stack frames"},
1007 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1008 "Optimize sibling and tail recursive calls" },
1009 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1010 "When running CSE, follow jumps to their targets" },
1011 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1012 "When running CSE, follow conditional jumps" },
1013 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1014 "Perform a number of minor, expensive optimisations" },
1015 {"thread-jumps", &flag_thread_jumps
, 1,
1016 "Perform jump threading optimisations"},
1017 {"strength-reduce", &flag_strength_reduce
, 1,
1018 "Perform strength reduction optimisations" },
1019 {"unroll-loops", &flag_unroll_loops
, 1,
1020 "Perform loop unrolling when iteration count is known" },
1021 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1022 "Perform loop unrolling for all loops" },
1023 {"move-all-movables", &flag_move_all_movables
, 1,
1024 "Force all loop invariant computations out of loops" },
1025 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1026 "Strength reduce all loop general induction variables" },
1027 {"writable-strings", &flag_writable_strings
, 1,
1028 "Store strings in writable data section" },
1029 {"peephole", &flag_no_peephole
, 0,
1030 "Enable machine specific peephole optimisations" },
1031 {"force-mem", &flag_force_mem
, 1,
1032 "Copy memory operands into registers before using" },
1033 {"force-addr", &flag_force_addr
, 1,
1034 "Copy memory address constants into regs before using" },
1035 {"function-cse", &flag_no_function_cse
, 0,
1036 "Allow function addresses to be held in registers" },
1037 {"inline-functions", &flag_inline_functions
, 1,
1038 "Integrate simple functions into their callers" },
1039 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1040 "Generate code for funcs even if they are fully inlined" },
1041 {"inline", &flag_no_inline
, 0,
1042 "Pay attention to the 'inline' keyword"},
1043 {"keep-static-consts", &flag_keep_static_consts
, 1,
1044 "Emit static const variables even if they are not used" },
1045 {"syntax-only", &flag_syntax_only
, 1,
1046 "Check for syntax errors, then stop" },
1047 {"shared-data", &flag_shared_data
, 1,
1048 "Mark data as shared rather than private" },
1049 {"caller-saves", &flag_caller_saves
, 1,
1050 "Enable saving registers around function calls" },
1051 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1052 "Return 'short' aggregates in memory, not registers" },
1053 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1054 "Return 'short' aggregates in registers" },
1055 {"delayed-branch", &flag_delayed_branch
, 1,
1056 "Attempt to fill delay slots of branch instructions" },
1057 {"gcse", &flag_gcse
, 1,
1058 "Perform the global common subexpression elimination" },
1059 {"gcse-lm", &flag_gcse_lm
, 1,
1060 "Perform enhanced load motion during global subexpression elimination" },
1061 {"gcse-sm", &flag_gcse_sm
, 1,
1062 "Perform store motion after global subexpression elimination" },
1063 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1064 "Run CSE pass after loop optimisations"},
1065 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1066 "Run the loop optimiser twice"},
1067 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1068 "Delete useless null pointer checks" },
1069 {"pretend-float", &flag_pretend_float
, 1,
1070 "Pretend that host and target use the same FP format"},
1071 {"schedule-insns", &flag_schedule_insns
, 1,
1072 "Reschedule instructions before register allocation"},
1073 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1074 "Reschedule instructions after register allocation"},
1075 {"sched-interblock",&flag_schedule_interblock
, 1,
1076 "Enable scheduling across basic blocks" },
1077 {"sched-spec",&flag_schedule_speculative
, 1,
1078 "Allow speculative motion of non-loads" },
1079 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1080 "Allow speculative motion of some loads" },
1081 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1082 "Allow speculative motion of more loads" },
1083 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1084 "Replace add,compare,branch with branch on count reg"},
1085 {"pic", &flag_pic
, 1,
1086 "Generate position independent code, if possible"},
1087 {"PIC", &flag_pic
, 2, ""},
1088 {"exceptions", &flag_exceptions
, 1,
1089 "Enable exception handling" },
1090 {"unwind-tables", &flag_unwind_tables
, 1,
1091 "Just generate unwind tables for exception handling" },
1092 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1093 "Support synchronous non-call exceptions" },
1094 {"profile-arcs", &profile_arc_flag
, 1,
1095 "Insert arc based program profiling code" },
1096 {"test-coverage", &flag_test_coverage
, 1,
1097 "Create data files needed by gcov" },
1098 {"branch-probabilities", &flag_branch_probabilities
, 1,
1099 "Use profiling information for branch probabilities" },
1100 {"reorder-blocks", &flag_reorder_blocks
, 1,
1101 "Reorder basic blocks to improve code placement" },
1102 {"rename-registers", &flag_rename_registers
, 1,
1103 "Do the register renaming optimization pass"},
1104 {"common", &flag_no_common
, 0,
1105 "Do not put unitialised globals in the common section" },
1106 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1107 "Do not generate .size directives" },
1108 {"function-sections", &flag_function_sections
, 1,
1109 "place each function into its own section" },
1110 {"data-sections", &flag_data_sections
, 1,
1111 "place data items into their own section" },
1112 {"verbose-asm", &flag_verbose_asm
, 1,
1113 "Add extra commentry to assembler output"},
1114 {"gnu-linker", &flag_gnu_linker
, 1,
1115 "Output GNU ld formatted global initialisers"},
1116 {"regmove", &flag_regmove
, 1,
1117 "Enables a register move optimisation"},
1118 {"optimize-register-move", &flag_regmove
, 1,
1119 "Do the full regmove optimization pass"},
1120 {"pack-struct", &flag_pack_struct
, 1,
1121 "Pack structure members together without holes" },
1122 {"stack-check", &flag_stack_check
, 1,
1123 "Insert stack checking code into the program" },
1124 {"argument-alias", &flag_argument_noalias
, 0,
1125 "Specify that arguments may alias each other & globals"},
1126 {"argument-noalias", &flag_argument_noalias
, 1,
1127 "Assume arguments may alias globals but not each other"},
1128 {"argument-noalias-global", &flag_argument_noalias
, 2,
1129 "Assume arguments do not alias each other or globals" },
1130 {"strict-aliasing", &flag_strict_aliasing
, 1,
1131 "Assume strict aliasing rules apply" },
1132 {"align-loops", &align_loops
, 0,
1133 "Align the start of loops" },
1134 {"align-jumps", &align_jumps
, 0,
1135 "Align labels which are only reached by jumping" },
1136 {"align-labels", &align_labels
, 0,
1137 "Align all labels" },
1138 {"align-functions", &align_functions
, 0,
1139 "Align the start of functions" },
1140 {"check-memory-usage", &flag_check_memory_usage
, 1,
1141 "Generate code to check every memory access" },
1142 {"prefix-function-name", &flag_prefix_function_name
, 1,
1143 "Add a prefix to all function names" },
1144 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1145 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1146 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1147 "Instrument function entry/exit with profiling calls"},
1148 {"ssa", &flag_ssa
, 1,
1149 "Enable SSA optimizations" },
1150 {"dce", &flag_dce
, 1,
1151 "Enable dead code elimination" },
1152 {"leading-underscore", &flag_leading_underscore
, 1,
1153 "External symbols have a leading underscore" },
1154 {"ident", &flag_no_ident
, 0,
1155 "Process #ident directives"},
1156 { "peephole2", &flag_peephole2
, 1,
1157 "Enables an rtl peephole pass run before sched2" },
1158 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1159 "Enables guessing of branch probabilities" },
1160 {"math-errno", &flag_errno_math
, 1,
1161 "Set errno after built-in math functions"},
1162 {"trapping-math", &flag_trapping_math
, 1,
1163 "Floating-point operations can trap"},
1164 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1165 "Allow math optimizations that may violate IEEE or ANSI standards"},
1166 {"bounded-pointers", &flag_bounded_pointers
, 1,
1167 "Compile pointers as triples: value, base & end" },
1168 {"bounds-check", &flag_bounds_check
, 1,
1169 "Generate code to check bounds before dereferencing pointers and arrays" },
1170 {"single-precision-constant", &flag_single_precision_constant
, 1,
1171 "Convert floating point constant to single precision constant"},
1172 {"time-report", &time_report
, 1,
1173 "Report time taken by each compiler pass at end of run"},
1174 {"mem-report", &mem_report
, 1,
1175 "Report on permanent memory allocation at end of run"},
1176 { "trapv", &flag_trapv
, 1,
1177 "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. */
1193 { "-ansi", "Compile just for ISO C89" },
1194 { "-fallow-single-precision",
1195 "Do not promote floats to double if using -traditional" },
1196 { "-std= ", "Determine language standard"},
1198 { "-fsigned-bitfields", "" },
1199 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1200 { "-fno-signed-bitfields", "" },
1201 { "-fno-unsigned-bitfields","" },
1202 { "-fsigned-char", "Make 'char' be signed by default"},
1203 { "-funsigned-char", "Make 'char' be unsigned by default"},
1204 { "-fno-signed-char", "" },
1205 { "-fno-unsigned-char", "" },
1207 { "-ftraditional", "" },
1208 { "-traditional", "Attempt to support traditional K&R style C"},
1209 { "-fnotraditional", "" },
1210 { "-fno-traditional", "" },
1213 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1214 { "-fbuiltin", "" },
1215 { "-fno-builtin", "Do not recognise any built in functions" },
1216 { "-fhosted", "Assume normal C execution environment" },
1217 { "-fno-hosted", "" },
1219 "Assume that standard libraries & main might not exist" },
1220 { "-fno-freestanding", "" },
1221 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1222 { "-fno-cond-mismatch", "" },
1223 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1224 { "-fno-dollars-in-identifiers", "" },
1225 { "-fpreprocessed", "" },
1226 { "-fno-preprocessed", "" },
1227 { "-fshort-double", "Use the same size for double as for float" },
1228 { "-fno-short-double", "" },
1229 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1230 { "-fno-short-enums", "" },
1231 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1232 { "-fno-short-wchar", "" },
1234 { "-Wall", "Enable most warning messages" },
1235 { "-Wbad-function-cast",
1236 "Warn about casting functions to incompatible types" },
1237 { "-Wno-bad-function-cast", "" },
1238 { "-Wno-missing-noreturn", "" },
1239 { "-Wmissing-format-attribute",
1240 "Warn about functions which might be candidates for format attributes" },
1241 { "-Wno-missing-format-attribute", "" },
1242 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1243 { "-Wno-cast-qual", "" },
1244 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1245 { "-Wno-char-subscripts", "" },
1246 { "-Wcomment", "Warn if nested comments are detected" },
1247 { "-Wno-comment", "" },
1248 { "-Wcomments", "Warn if nested comments are detected" },
1249 { "-Wno-comments", "" },
1250 { "-Wconversion", "Warn about possibly confusing type conversions" },
1251 { "-Wno-conversion", "" },
1252 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1253 { "-Wno-format", "" },
1254 { "-Wformat-y2k", "" },
1255 { "-Wno-format-y2k",
1256 "Don't warn about strftime formats yielding 2 digit years" },
1257 { "-Wformat-extra-args", "" },
1258 { "-Wno-format-extra-args",
1259 "Don't warn about too many arguments to format functions" },
1260 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1261 { "-Wno-format-nonliteral", "" },
1262 { "-Wformat-security",
1263 "Warn about possible security problems with format functions" },
1264 { "-Wno-format-security", "" },
1265 { "-Wimplicit-function-declaration",
1266 "Warn about implicit function declarations" },
1267 { "-Wno-implicit-function-declaration", "" },
1268 { "-Werror-implicit-function-declaration", "" },
1269 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1270 { "-Wno-implicit-int", "" },
1271 { "-Wimplicit", "" },
1272 { "-Wno-implicit", "" },
1273 { "-Wimport", "Warn about the use of the #import directive" },
1274 { "-Wno-import", "" },
1275 { "-Wlong-long","" },
1276 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1277 { "-Wmain", "Warn about suspicious declarations of main" },
1278 { "-Wno-main", "" },
1279 { "-Wmissing-braces",
1280 "Warn about possibly missing braces around initialisers" },
1281 { "-Wno-missing-braces", "" },
1282 { "-Wmissing-declarations",
1283 "Warn about global funcs without previous declarations"},
1284 { "-Wno-missing-declarations", "" },
1285 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1286 { "-Wno-missing-prototypes", "" },
1287 { "-Wmultichar", "Warn about use of multicharacter literals"},
1288 { "-Wno-multichar", "" },
1289 { "-Wnested-externs", "Warn about externs not at file scope level" },
1290 { "-Wno-nested-externs", "" },
1291 { "-Wparentheses", "Warn about possible missing parentheses" },
1292 { "-Wno-parentheses", "" },
1293 { "-Wsequence-point",
1294 "Warn about possible violations of sequence point rules" },
1295 { "-Wno-sequence-point", "" },
1296 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1297 { "-Wno-pointer-arith", "" },
1298 { "-Wredundant-decls",
1299 "Warn about multiple declarations of the same object" },
1300 { "-Wno-redundant-decls", "" },
1301 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1302 { "-Wno-sign-compare", "" },
1303 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1304 { "-Wno-float-equal", "" },
1305 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1306 { "-Wno-unknown-pragmas", "" },
1307 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1308 { "-Wno-strict-prototypes", "" },
1309 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1310 { "-Wno-traditional", "" },
1311 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1312 { "-Wno-trigraphs", "" },
1314 { "-Wno-undef", "" },
1315 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1316 { "-Wno-write-strings", "" },
1318 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1320 #include "options.h"
1324 /* Here is a table, controlled by the tm.h file, listing each -m switch
1325 and which bits in `target_switches' it should set or clear.
1326 If VALUE is positive, it is bits to set.
1327 If VALUE is negative, -VALUE is bits to clear.
1328 (The sign bit is not used so there is no confusion.) */
1334 const char *description
;
1336 target_switches
[] = TARGET_SWITCHES
;
1338 /* This table is similar, but allows the switch to have a value. */
1340 #ifdef TARGET_OPTIONS
1344 const char **variable
;
1345 const char *description
;
1347 target_options
[] = TARGET_OPTIONS
;
1350 /* Options controlling warnings. */
1352 /* Don't print warning messages. -w. */
1354 int inhibit_warnings
= 0;
1356 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1358 int warn_system_headers
= 0;
1360 /* Print various extra warnings. -W. */
1362 int extra_warnings
= 0;
1364 /* Treat warnings as errors. -Werror. */
1366 int warnings_are_errors
= 0;
1368 /* Nonzero to warn about unused variables, functions et.al. */
1370 int warn_unused_function
;
1371 int warn_unused_label
;
1372 int warn_unused_parameter
;
1373 int warn_unused_variable
;
1374 int warn_unused_value
;
1377 set_Wunused (setting
)
1380 warn_unused_function
= setting
;
1381 warn_unused_label
= setting
;
1382 /* Unused function parameter warnings are reported when either ``-W
1383 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1384 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1386 warn_unused_parameter
= 0;
1387 else if (!warn_unused_parameter
)
1388 warn_unused_parameter
= -1;
1389 warn_unused_variable
= setting
;
1390 warn_unused_value
= setting
;
1393 /* Nonzero to warn about code which is never reached. */
1395 int warn_notreached
;
1397 /* Nonzero to warn about variables used before they are initialized. */
1399 int warn_uninitialized
;
1401 /* Nonzero means warn about all declarations which shadow others. */
1405 /* Warn if a switch on an enum fails to have a case for every enum value. */
1409 /* Nonzero means warn about function definitions that default the return type
1410 or that use a null return and have a return-type other than void. */
1412 int warn_return_type
;
1414 /* Nonzero means warn about pointer casts that increase the required
1415 alignment of the target type (and might therefore lead to a crash
1416 due to a misaligned access). */
1418 int warn_cast_align
;
1420 /* Nonzero means warn about any identifiers that match in the first N
1421 characters. The value N is in `id_clash_len'. */
1426 /* Nonzero means warn about any objects definitions whose size is larger
1427 than N bytes. Also want about function definitions whose returned
1428 values are larger than N bytes. The value N is in `larger_than_size'. */
1430 int warn_larger_than
;
1431 HOST_WIDE_INT larger_than_size
;
1433 /* Nonzero means warn if inline function is too large. */
1437 /* Warn if a function returns an aggregate,
1438 since there are often incompatible calling conventions for doing this. */
1440 int warn_aggregate_return
;
1442 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1446 /* Warn when gcc pads a structure to an alignment boundary. */
1450 /* Warn when an optimization pass is disabled. */
1452 int warn_disabled_optimization
;
1454 /* Warn about functions which might be candidates for attribute noreturn. */
1456 int warn_missing_noreturn
;
1458 /* Likewise for -W. */
1460 lang_independent_options W_options
[] =
1462 {"unused-function", &warn_unused_function
, 1, "Warn when a function is unused" },
1463 {"unused-label", &warn_unused_label
, 1, "Warn when a label is unused" },
1464 {"unused-parameter", &warn_unused_parameter
, 1, "Warn when a function parameter is unused" },
1465 {"unused-variable", &warn_unused_variable
, 1, "Warn when a variable is unused" },
1466 {"unused-value", &warn_unused_value
, 1, "Warn when an expression value is unused" },
1467 {"system-headers", &warn_system_headers
, 1, "Do not suppress warnings from system headers"},
1468 {"error", &warnings_are_errors
, 1, ""},
1469 {"shadow", &warn_shadow
, 1, "Warn when one local variable shadows another" },
1470 {"switch", &warn_switch
, 1,
1471 "Warn about enumerated switches missing a specific case" },
1472 {"aggregate-return", &warn_aggregate_return
, 1,
1473 "Warn about returning structures, unions or arrays" },
1474 {"cast-align", &warn_cast_align
, 1,
1475 "Warn about pointer casts which increase alignment" },
1476 {"unreachable-code", &warn_notreached
, 1,
1477 "Warn about code that will never be executed" },
1478 {"uninitialized", &warn_uninitialized
, 1,
1479 "Warn about unitialized automatic variables"},
1480 {"inline", &warn_inline
, 1,
1481 "Warn when an inlined function cannot be inlined"},
1482 {"packed", &warn_packed
, 1,
1483 "Warn when the packed attribute has no effect on struct layout"},
1484 {"padded", &warn_padded
, 1,
1485 "Warn when padding is required to align struct members"},
1486 {"disabled-optimization", &warn_disabled_optimization
, 1,
1487 "Warn when an optimization pass is disabled"},
1488 {"missing-noreturn", &warn_missing_noreturn
, 1,
1489 "Warn about functions which might be candidates for attribute noreturn"}
1492 /* The following routines are useful in setting all the flags that
1493 -ffast-math and -fno-fast-math imply. */
1496 set_fast_math_flags ()
1498 flag_trapping_math
= 0;
1499 flag_unsafe_math_optimizations
= 1;
1500 flag_errno_math
= 0;
1504 set_no_fast_math_flags ()
1506 flag_trapping_math
= 1;
1507 flag_unsafe_math_optimizations
= 0;
1508 flag_errno_math
= 1;
1512 /* Output files for assembler code (real compiler output)
1513 and debugging dumps. */
1516 FILE *aux_info_file
;
1517 FILE *rtl_dump_file
= NULL
;
1519 /* Decode the string P as an integral parameter.
1520 If the string is indeed an integer return its numeric value else
1521 issue an Invalid Option error for the option PNAME and return DEFVAL.
1522 If PNAME is zero just return DEFVAL, do not call error. */
1525 read_integral_parameter (p
, pname
, defval
)
1530 const char *endp
= p
;
1534 if (*endp
>= '0' && *endp
<= '9')
1543 error ("Invalid option `%s'", pname
);
1551 /* This is the default decl_printable_name function. */
1554 decl_name (decl
, verbosity
)
1556 int verbosity ATTRIBUTE_UNUSED
;
1558 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1562 /* This calls abort and is used to avoid problems when abort if a macro.
1563 It is used when we need to pass the address of abort. */
1571 /* When `malloc.c' is compiled with `rcheck' defined,
1572 it calls this function to report clobberage. */
1576 const char *s ATTRIBUTE_UNUSED
;
1581 /* Return the logarithm of X, base 2, considering X unsigned,
1582 if X is a power of 2. Otherwise, returns -1.
1584 This should be used via the `exact_log2' macro. */
1588 register unsigned HOST_WIDE_INT x
;
1590 register int log
= 0;
1591 /* Test for 0 or a power of 2. */
1592 if (x
== 0 || x
!= (x
& -x
))
1594 while ((x
>>= 1) != 0)
1599 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1600 If X is 0, return -1.
1602 This should be used via the floor_log2 macro. */
1606 register unsigned HOST_WIDE_INT x
;
1608 register int log
= -1;
1615 /* Return the approximate positive square root of a number N. This is for
1616 statistical reports, not code generation. */
1631 d
= (s
* s
- x
) / (2 * s
);
1638 static int float_handler_set
;
1640 jmp_buf float_handler
;
1642 /* Signals actually come here. */
1645 float_signal (signo
)
1646 /* If this is missing, some compilers complain. */
1647 int signo ATTRIBUTE_UNUSED
;
1649 if (float_handled
== 0)
1650 crash_signal (signo
);
1653 /* On System-V derived systems, we must reinstall the signal handler.
1654 This is harmless on BSD-derived systems. */
1655 signal (SIGFPE
, float_signal
);
1656 longjmp (float_handler
, 1);
1659 /* Specify where to longjmp to when a floating arithmetic error happens.
1660 If HANDLER is 0, it means don't handle the errors any more. */
1663 set_float_handler (handler
)
1666 float_handled
= (handler
!= 0);
1668 memcpy (float_handler
, handler
, sizeof (float_handler
));
1670 if (float_handled
&& ! float_handler_set
)
1672 signal (SIGFPE
, float_signal
);
1673 float_handler_set
= 1;
1677 /* This is a wrapper function for code which might elicit an
1678 arithmetic exception. That code should be passed in as a function
1679 pointer FN, and one argument DATA. DATA is usually a struct which
1680 contains the real input and output for function FN. This function
1681 returns 0 (failure) if longjmp was called (i.e. an exception
1682 occured.) It returns 1 (success) otherwise. */
1685 do_float_handler (fn
, data
)
1686 void (*fn
) PARAMS ((PTR
));
1693 /* We got here via longjmp () caused by an exception in function
1695 set_float_handler (NULL
);
1699 set_float_handler (buf
);
1701 set_float_handler (NULL
);
1705 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1706 into ICE messages, which is much more user friendly. */
1709 crash_signal (signo
)
1712 internal_error ("Internal error: %s", strsignal (signo
));
1715 /* Strip off a legitimate source ending from the input string NAME of
1716 length LEN. Rather than having to know the names used by all of
1717 our front ends, we strip off an ending of a period followed by
1718 up to five characters. (Java uses ".class".) */
1721 strip_off_ending (name
, len
)
1726 for (i
= 2; i
< 6 && len
> i
; i
++)
1728 if (name
[len
- i
] == '.')
1730 name
[len
- i
] = '\0';
1736 /* Output a quoted string. */
1739 output_quoted_string (asm_file
, string
)
1743 #ifdef OUTPUT_QUOTED_STRING
1744 OUTPUT_QUOTED_STRING (asm_file
, string
);
1748 putc ('\"', asm_file
);
1749 while ((c
= *string
++) != 0)
1751 if (c
== '\"' || c
== '\\')
1752 putc ('\\', asm_file
);
1755 putc ('\"', asm_file
);
1759 /* Output a file name in the form wanted by System V. */
1762 output_file_directive (asm_file
, input_name
)
1764 const char *input_name
;
1766 int len
= strlen (input_name
);
1767 const char *na
= input_name
+ len
;
1769 /* NA gets INPUT_NAME sans directory names. */
1770 while (na
> input_name
)
1772 if (IS_DIR_SEPARATOR (na
[-1]))
1777 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1778 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1780 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1781 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1783 fprintf (asm_file
, "\t.file\t");
1784 output_quoted_string (asm_file
, na
);
1785 fputc ('\n', asm_file
);
1790 /* Routine to open a dump file. Return true if the dump file is enabled. */
1793 open_dump_file (index
, decl
)
1794 enum dump_file_index index
;
1798 const char *open_arg
;
1801 if (! dump_file
[index
].enabled
)
1804 timevar_push (TV_DUMP
);
1805 if (rtl_dump_file
!= NULL
)
1806 fclose (rtl_dump_file
);
1808 sprintf (seq
, ".%02d.", index
);
1810 if (! dump_file
[index
].initialized
)
1812 /* If we've not initialized the files, do so now. */
1813 if (graph_dump_format
!= no_graph
1814 && dump_file
[index
].graph_dump_p
)
1816 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1817 clean_graph_dump_file (dump_base_name
, dump_name
);
1820 dump_file
[index
].initialized
= 1;
1826 dump_name
= concat (dump_base_name
, seq
,
1827 dump_file
[index
].extension
, NULL
);
1829 rtl_dump_file
= fopen (dump_name
, open_arg
);
1830 if (rtl_dump_file
== NULL
)
1831 fatal_io_error ("can't open %s", dump_name
);
1836 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1837 decl_printable_name (decl
, 2));
1839 timevar_pop (TV_DUMP
);
1843 /* Routine to close a dump file. */
1846 close_dump_file (index
, func
, insns
)
1847 enum dump_file_index index
;
1848 void (*func
) PARAMS ((FILE *, rtx
));
1851 if (! rtl_dump_file
)
1854 timevar_push (TV_DUMP
);
1856 && graph_dump_format
!= no_graph
1857 && dump_file
[index
].graph_dump_p
)
1862 sprintf (seq
, ".%02d.", index
);
1863 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1864 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1869 func (rtl_dump_file
, insns
);
1871 fflush (rtl_dump_file
);
1872 fclose (rtl_dump_file
);
1874 rtl_dump_file
= NULL
;
1875 timevar_pop (TV_DUMP
);
1878 /* Do any final processing required for the declarations in VEC, of
1879 which there are LEN. We write out inline functions and variables
1880 that have been deferred until this point, but which are required.
1881 Returns non-zero if anything was put out. */
1884 wrapup_global_declarations (vec
, len
)
1891 int output_something
= 0;
1893 for (i
= 0; i
< len
; i
++)
1897 /* We're not deferring this any longer. */
1898 DECL_DEFER_OUTPUT (decl
) = 0;
1900 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1901 && incomplete_decl_finalize_hook
!= 0)
1902 (*incomplete_decl_finalize_hook
) (decl
);
1905 /* Now emit any global variables or functions that we have been
1906 putting off. We need to loop in case one of the things emitted
1907 here references another one which comes earlier in the list. */
1911 for (i
= 0; i
< len
; i
++)
1915 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1918 /* Don't write out static consts, unless we still need them.
1920 We also keep static consts if not optimizing (for debugging),
1921 unless the user specified -fno-keep-static-consts.
1922 ??? They might be better written into the debug information.
1923 This is possible when using DWARF.
1925 A language processor that wants static constants to be always
1926 written out (even if it is not used) is responsible for
1927 calling rest_of_decl_compilation itself. E.g. the C front-end
1928 calls rest_of_decl_compilation from finish_decl.
1929 One motivation for this is that is conventional in some
1930 environments to write things like:
1931 static const char rcsid[] = "... version string ...";
1932 intending to force the string to be in the executable.
1934 A language processor that would prefer to have unneeded
1935 static constants "optimized away" would just defer writing
1936 them out until here. E.g. C++ does this, because static
1937 constants are often defined in header files.
1939 ??? A tempting alternative (for both C and C++) would be
1940 to force a constant to be written if and only if it is
1941 defined in a main file, as opposed to an include file. */
1943 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1944 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1945 && !DECL_COMDAT (decl
))
1947 && flag_keep_static_consts
1948 && !DECL_ARTIFICIAL (decl
))
1949 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1952 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1955 if (TREE_CODE (decl
) == FUNCTION_DECL
1956 && DECL_INITIAL (decl
) != 0
1957 && DECL_SAVED_INSNS (decl
) != 0
1958 && (flag_keep_inline_functions
1959 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1960 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1963 output_inline_function (decl
);
1968 output_something
= 1;
1972 return output_something
;
1975 /* Issue appropriate warnings for the global declarations in VEC (of
1976 which there are LEN). Output debugging information for them. */
1979 check_global_declarations (vec
, len
)
1986 for (i
= 0; i
< len
; i
++)
1990 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1991 && ! TREE_ASM_WRITTEN (decl
))
1992 /* Cancel the RTL for this decl so that, if debugging info
1993 output for global variables is still to come,
1994 this one will be omitted. */
1995 SET_DECL_RTL (decl
, NULL_RTX
);
1997 /* Warn about any function
1998 declared static but not defined.
1999 We don't warn about variables,
2000 because many programs have static variables
2001 that exist only to get some text into the object file. */
2002 if (TREE_CODE (decl
) == FUNCTION_DECL
2003 && (warn_unused_function
2004 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2005 && DECL_INITIAL (decl
) == 0
2006 && DECL_EXTERNAL (decl
)
2007 && ! DECL_ARTIFICIAL (decl
)
2008 && ! TREE_PUBLIC (decl
))
2010 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2011 pedwarn_with_decl (decl
,
2012 "`%s' used but never defined");
2014 warning_with_decl (decl
,
2015 "`%s' declared `static' but never defined");
2016 /* This symbol is effectively an "extern" declaration now. */
2017 TREE_PUBLIC (decl
) = 1;
2018 assemble_external (decl
);
2021 /* Warn about static fns or vars defined but not used,
2022 but not about inline functions or static consts
2023 since defining those in header files is normal practice. */
2024 if (((warn_unused_function
2025 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2026 || (warn_unused_variable
2027 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2028 && ! DECL_IN_SYSTEM_HEADER (decl
)
2029 && ! DECL_EXTERNAL (decl
)
2030 && ! TREE_PUBLIC (decl
)
2031 && ! TREE_USED (decl
)
2032 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2033 /* The TREE_USED bit for file-scope decls
2034 is kept in the identifier, to handle multiple
2035 external decls in different scopes. */
2036 && ! TREE_USED (DECL_NAME (decl
)))
2037 warning_with_decl (decl
, "`%s' defined but not used");
2039 timevar_push (TV_SYMOUT
);
2040 #ifdef SDB_DEBUGGING_INFO
2041 /* The COFF linker can move initialized global vars to the end.
2042 And that can screw up the symbol ordering.
2043 By putting the symbols in that order to begin with,
2044 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2045 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2046 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2047 && ! DECL_EXTERNAL (decl
)
2048 && DECL_RTL (decl
) != 0)
2049 sdbout_symbol (decl
, 0);
2051 /* Output COFF information for non-global
2052 file-scope initialized variables. */
2053 if (write_symbols
== SDB_DEBUG
2054 && TREE_CODE (decl
) == VAR_DECL
2055 && DECL_INITIAL (decl
)
2056 && ! DECL_EXTERNAL (decl
)
2057 && DECL_RTL (decl
) != 0
2058 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2059 sdbout_toplevel_data (decl
);
2060 #endif /* SDB_DEBUGGING_INFO */
2061 #ifdef DWARF_DEBUGGING_INFO
2062 /* Output DWARF information for file-scope tentative data object
2063 declarations, file-scope (extern) function declarations (which
2064 had no corresponding body) and file-scope tagged type declarations
2065 and definitions which have not yet been forced out. */
2067 if (write_symbols
== DWARF_DEBUG
2068 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2069 dwarfout_file_scope_decl (decl
, 1);
2071 #ifdef DWARF2_DEBUGGING_INFO
2072 /* Output DWARF2 information for file-scope tentative data object
2073 declarations, file-scope (extern) function declarations (which
2074 had no corresponding body) and file-scope tagged type declarations
2075 and definitions which have not yet been forced out. */
2077 if (write_symbols
== DWARF2_DEBUG
2078 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2079 dwarf2out_decl (decl
);
2081 timevar_pop (TV_SYMOUT
);
2085 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2086 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2087 INPUT_FILENAME and LINENO accordingly. */
2090 push_srcloc (file
, line
)
2094 struct file_stack
*fs
;
2096 if (input_file_stack
)
2098 input_file_stack
->name
= input_filename
;
2099 input_file_stack
->line
= lineno
;
2102 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2103 fs
->name
= input_filename
= file
;
2104 fs
->line
= lineno
= line
;
2105 fs
->indent_level
= 0;
2106 fs
->next
= input_file_stack
;
2107 input_file_stack
= fs
;
2108 input_file_stack_tick
++;
2111 /* Pop the top entry off the stack of presently open source files.
2112 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2118 struct file_stack
*fs
;
2120 fs
= input_file_stack
;
2121 input_file_stack
= fs
->next
;
2123 input_file_stack_tick
++;
2124 /* The initial source file is never popped. */
2125 if (!input_file_stack
)
2127 input_filename
= input_file_stack
->name
;
2128 lineno
= input_file_stack
->line
;
2131 /* Compile an entire file of output from cpp, named NAME.
2132 Write a file of assembly output and various debugging dumps. */
2140 int name_specified
= name
!= 0;
2142 if (dump_base_name
== 0)
2143 dump_base_name
= name
? name
: "gccdump";
2148 /* Start timing total execution time. */
2151 timevar_start (TV_TOTAL
);
2153 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2154 because then the driver will have provided the name of a temporary
2155 file or bit bucket for us. */
2157 if (! name_specified
&& asm_file_name
== 0)
2158 asm_out_file
= stdout
;
2161 if (asm_file_name
== 0)
2163 int len
= strlen (dump_base_name
);
2164 char *dumpname
= (char *) xmalloc (len
+ 6);
2165 memcpy (dumpname
, dump_base_name
, len
+ 1);
2166 strip_off_ending (dumpname
, len
);
2167 strcat (dumpname
, ".s");
2168 asm_file_name
= dumpname
;
2170 if (!strcmp (asm_file_name
, "-"))
2171 asm_out_file
= stdout
;
2173 asm_out_file
= fopen (asm_file_name
, "w");
2174 if (asm_out_file
== 0)
2175 fatal_io_error ("can't open %s for writing", asm_file_name
);
2178 /* Initialize data in various passes. */
2181 name
= init_parse (name
);
2182 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2183 || debug_info_level
== DINFO_LEVEL_VERBOSE
2184 || flag_test_coverage
2185 || warn_notreached
);
2188 init_decl_processing ();
2194 init_function_once ();
2195 init_stor_layout_once ();
2196 init_varasm_once ();
2197 init_EXPR_INSN_LIST_cache ();
2199 /* The following initialization functions need to generate rtl, so
2200 provide a dummy function context for them. */
2201 init_dummy_function_start ();
2204 if (flag_caller_saves
)
2205 init_caller_save ();
2206 expand_dummy_function_end ();
2208 /* If auxiliary info generation is desired, open the output file.
2209 This goes in the same directory as the source file--unlike
2210 all the other output files. */
2211 if (flag_gen_aux_info
)
2213 aux_info_file
= fopen (aux_info_file_name
, "w");
2214 if (aux_info_file
== 0)
2215 fatal_io_error ("can't open %s", aux_info_file_name
);
2218 #ifdef IO_BUFFER_SIZE
2219 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2220 _IOFBF
, IO_BUFFER_SIZE
);
2224 name
= ggc_strdup (name
);
2226 input_filename
= name
;
2228 /* Put an entry on the input file stack for the main input file. */
2229 push_srcloc (input_filename
, 0);
2231 /* Perform language-specific initialization.
2232 This may set main_input_filename. */
2233 if (lang_hooks
.init
)
2234 (*lang_hooks
.init
) ();
2236 /* If the input doesn't start with a #line, use the input name
2237 as the official input file name. */
2238 if (main_input_filename
== 0)
2239 main_input_filename
= name
;
2241 if (flag_syntax_only
)
2243 write_symbols
= NO_DEBUG
;
2245 profile_block_flag
= 0;
2249 ASM_FILE_START (asm_out_file
);
2251 #ifdef ASM_COMMENT_START
2252 if (flag_verbose_asm
)
2254 /* Print the list of options in effect. */
2255 print_version (asm_out_file
, ASM_COMMENT_START
);
2256 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2257 ASM_COMMENT_START
, " ", "\n");
2258 /* Add a blank line here so it appears in assembler output but not
2260 fprintf (asm_out_file
, "\n");
2263 } /* ! flag_syntax_only */
2265 #ifndef ASM_OUTPUT_SECTION_NAME
2266 if (flag_function_sections
)
2268 warning ("-ffunction-sections not supported for this target.");
2269 flag_function_sections
= 0;
2271 if (flag_data_sections
)
2273 warning ("-fdata-sections not supported for this target.");
2274 flag_data_sections
= 0;
2278 if (flag_function_sections
2279 && (profile_flag
|| profile_block_flag
))
2281 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2282 flag_function_sections
= 0;
2285 #ifndef OBJECT_FORMAT_ELF
2286 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2287 warning ("-ffunction-sections may affect debugging on some targets.");
2290 /* If dbx symbol table desired, initialize writing it
2291 and output the predefined types. */
2292 timevar_push (TV_SYMOUT
);
2293 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2294 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2295 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2297 #ifdef SDB_DEBUGGING_INFO
2298 if (write_symbols
== SDB_DEBUG
)
2299 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2301 #ifdef DWARF_DEBUGGING_INFO
2302 if (write_symbols
== DWARF_DEBUG
)
2303 dwarfout_init (asm_out_file
, main_input_filename
);
2305 #ifdef DWARF2_UNWIND_INFO
2306 if (dwarf2out_do_frame ())
2307 dwarf2out_frame_init ();
2309 #ifdef DWARF2_DEBUGGING_INFO
2310 if (write_symbols
== DWARF2_DEBUG
)
2311 dwarf2out_init (asm_out_file
, main_input_filename
);
2313 timevar_pop (TV_SYMOUT
);
2315 /* Initialize yet another pass. */
2317 init_final (main_input_filename
);
2318 init_branch_prob (dump_base_name
);
2320 timevar_push (TV_PARSE
);
2322 /* Call the parser, which parses the entire file
2323 (calling rest_of_compilation for each function). */
2325 if (yyparse () != 0)
2327 if (errorcount
== 0)
2328 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2330 /* In case there were missing closebraces,
2331 get us back to the global binding level. */
2332 while (! global_bindings_p ())
2336 /* Compilation is now finished except for writing
2337 what's left of the symbol table output. */
2339 timevar_pop (TV_PARSE
);
2341 if (flag_syntax_only
)
2344 globals
= getdecls ();
2346 /* Really define vars that have had only a tentative definition.
2347 Really output inline functions that must actually be callable
2348 and have not been output so far. */
2351 int len
= list_length (globals
);
2352 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2356 /* Process the decls in reverse order--earliest first.
2357 Put them into VEC from back to front, then take out from front. */
2359 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2360 vec
[len
- i
- 1] = decl
;
2362 wrapup_global_declarations (vec
, len
);
2364 /* This must occur after the loop to output deferred functions. Else
2365 the profiler initializer would not be emitted if all the functions
2366 in this compilation unit were deferred.
2368 output_func_start_profiler can not cause any additional functions or
2369 data to need to be output, so it need not be in the deferred function
2371 output_func_start_profiler ();
2373 check_global_declarations (vec
, len
);
2379 /* Write out any pending weak symbol declarations. */
2383 /* Do dbx symbols. */
2384 timevar_push (TV_SYMOUT
);
2385 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2386 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2387 dbxout_finish (asm_out_file
, main_input_filename
);
2390 #ifdef DWARF_DEBUGGING_INFO
2391 if (write_symbols
== DWARF_DEBUG
)
2395 #ifdef DWARF2_UNWIND_INFO
2396 if (dwarf2out_do_frame ())
2397 dwarf2out_frame_finish ();
2400 #ifdef DWARF2_DEBUGGING_INFO
2401 if (write_symbols
== DWARF2_DEBUG
)
2402 dwarf2out_finish ();
2404 timevar_pop (TV_SYMOUT
);
2406 /* Output some stuff at end of file if nec. */
2408 dw2_output_indirect_constants ();
2410 end_final (dump_base_name
);
2412 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2414 timevar_push (TV_DUMP
);
2415 open_dump_file (DFI_bp
, NULL
);
2419 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2420 timevar_pop (TV_DUMP
);
2424 ASM_FILE_END (asm_out_file
);
2427 /* Attach a special .ident directive to the end of the file to identify
2428 the version of GCC which compiled this code. The format of the .ident
2429 string is patterned after the ones produced by native SVR4 compilers. */
2432 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2433 IDENT_ASM_OP
, version_string
);
2436 /* Language-specific end of compilation actions. */
2438 if (lang_hooks
.finish
)
2439 (*lang_hooks
.finish
) ();
2441 /* Close the dump files. */
2443 if (flag_gen_aux_info
)
2445 fclose (aux_info_file
);
2447 unlink (aux_info_file_name
);
2450 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2452 timevar_push (TV_DUMP
);
2453 dump_combine_total_stats (rtl_dump_file
);
2454 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2455 timevar_pop (TV_DUMP
);
2458 /* Close non-debugging input and output files. Take special care to note
2459 whether fclose returns an error, since the pages might still be on the
2460 buffer chain while the file is open. */
2464 if (ferror (asm_out_file
) != 0)
2465 fatal_io_error ("error writing to %s", asm_file_name
);
2466 if (fclose (asm_out_file
) != 0)
2467 fatal_io_error ("error closing %s", asm_file_name
);
2469 /* Do whatever is necessary to finish printing the graphs. */
2470 if (graph_dump_format
!= no_graph
)
2474 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2475 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2480 sprintf (seq
, ".%02d.", i
);
2481 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2482 finish_graph_dump_file (dump_base_name
, suffix
);
2489 ggc_print_statistics ();
2490 stringpool_statistics ();
2493 /* Free up memory for the benefit of leak detectors. */
2496 /* Stop timing total execution time. */
2497 timevar_stop (TV_TOTAL
);
2499 /* Print the times. */
2501 timevar_print (stderr
);
2504 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2505 and TYPE_DECL nodes.
2507 This does nothing for local (non-static) variables, unless the
2508 variable is a register variable with an ASMSPEC. In that case, or
2509 if the variable is not an automatice, it sets up the RTL and
2510 outputs any assembler code (label definition, storage allocation
2511 and initialization).
2513 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2514 the assembler symbol name to be used. TOP_LEVEL is nonzero
2515 if this declaration is not within a function. */
2518 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2520 const char *asmspec
;
2524 /* Declarations of variables, and of functions defined elsewhere. */
2526 /* The most obvious approach, to put an #ifndef around where
2527 this macro is used, doesn't work since it's inside a macro call. */
2528 #ifndef ASM_FINISH_DECLARE_OBJECT
2529 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2532 /* Forward declarations for nested functions are not "external",
2533 but we need to treat them as if they were. */
2534 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2535 || TREE_CODE (decl
) == FUNCTION_DECL
)
2537 timevar_push (TV_VARCONST
);
2539 make_decl_rtl (decl
, asmspec
);
2540 /* Don't output anything
2541 when a tentative file-scope definition is seen.
2542 But at end of compilation, do output code for them. */
2543 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2544 assemble_variable (decl
, top_level
, at_end
, 0);
2545 if (decl
== last_assemble_variable_decl
)
2547 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2550 timevar_pop (TV_VARCONST
);
2552 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2554 if (decode_reg_name (asmspec
) >= 0)
2556 SET_DECL_RTL (decl
, NULL_RTX
);
2557 make_decl_rtl (decl
, asmspec
);
2561 error ("invalid register name `%s' for register variable", asmspec
);
2562 DECL_REGISTER (decl
) = 0;
2567 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2568 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2569 && TREE_CODE (decl
) == TYPE_DECL
)
2571 timevar_push (TV_SYMOUT
);
2572 dbxout_symbol (decl
, 0);
2573 timevar_pop (TV_SYMOUT
);
2576 #ifdef SDB_DEBUGGING_INFO
2577 else if (write_symbols
== SDB_DEBUG
&& top_level
2578 && TREE_CODE (decl
) == TYPE_DECL
)
2580 timevar_push (TV_SYMOUT
);
2581 sdbout_symbol (decl
, 0);
2582 timevar_pop (TV_SYMOUT
);
2587 /* Called after finishing a record, union or enumeral type. */
2590 rest_of_type_compilation (type
, toplev
)
2591 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2595 tree type ATTRIBUTE_UNUSED
;
2596 int toplev ATTRIBUTE_UNUSED
;
2599 timevar_push (TV_SYMOUT
);
2600 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2601 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2602 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2604 #ifdef SDB_DEBUGGING_INFO
2605 if (write_symbols
== SDB_DEBUG
)
2606 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2608 #ifdef DWARF2_DEBUGGING_INFO
2609 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2610 dwarf2out_decl (TYPE_STUB_DECL (type
));
2612 timevar_pop (TV_SYMOUT
);
2615 /* DECL is an inline function, whose body is present, but which is not
2616 being output at this point. (We're putting that off until we need
2617 to do it.) If there are any actions that need to take place,
2618 including the emission of debugging information for the function,
2619 this is where they should go. This function may be called by
2620 language-dependent code for front-ends that do not even generate
2621 RTL for functions that don't need to be put out. */
2624 note_deferral_of_defined_inline_function (decl
)
2625 tree decl ATTRIBUTE_UNUSED
;
2627 #ifdef DWARF_DEBUGGING_INFO
2628 /* Generate the DWARF info for the "abstract" instance of a function
2629 which we may later generate inlined and/or out-of-line instances
2631 if (write_symbols
== DWARF_DEBUG
2632 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2633 && ! DECL_ABSTRACT_ORIGIN (decl
))
2635 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2636 DWARF code expects it to be set in this case. Intuitively,
2637 DECL is the function we just finished defining, so setting
2638 CURRENT_FUNCTION_DECL is sensible. */
2639 tree saved_cfd
= current_function_decl
;
2640 int was_abstract
= DECL_ABSTRACT (decl
);
2641 current_function_decl
= decl
;
2643 /* Let the DWARF code do its work. */
2644 set_decl_abstract_flags (decl
, 1);
2645 dwarfout_file_scope_decl (decl
, 0);
2647 set_decl_abstract_flags (decl
, 0);
2649 /* Reset CURRENT_FUNCTION_DECL. */
2650 current_function_decl
= saved_cfd
;
2655 /* FNDECL is an inline function which is about to be emitted out of line.
2656 Do any preparation, such as emitting abstract debug info for the inline
2657 before it gets mangled by optimization. */
2660 note_outlining_of_inline_function (fndecl
)
2661 tree fndecl ATTRIBUTE_UNUSED
;
2663 #ifdef DWARF2_DEBUGGING_INFO
2664 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2665 the abstract description of inline functions until something tries to
2666 reference them. Force it out now, before optimizations mangle the
2668 if (write_symbols
== DWARF2_DEBUG
)
2669 dwarf2out_abstract_function (fndecl
);
2673 /* This is called from finish_function (within yyparse)
2674 after each top-level definition is parsed.
2675 It is supposed to compile that function or variable
2676 and output the assembler code for it.
2677 After we return, the tree storage is freed. */
2680 rest_of_compilation (decl
)
2686 int rebuild_label_notes_after_reload
;
2687 int register_life_up_to_date
;
2689 timevar_push (TV_REST_OF_COMPILATION
);
2691 /* Now that we're out of the frontend, we shouldn't have any more
2692 CONCATs anywhere. */
2693 generating_concat_p
= 0;
2695 /* When processing delayed functions, prepare_function_start() won't
2696 have been run to re-initialize it. */
2697 cse_not_expected
= ! optimize
;
2699 /* First, make sure that NOTE_BLOCK is set correctly for each
2700 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2701 if (!cfun
->x_whole_function_mode_p
)
2704 /* Then remove any notes we don't need. That will make iterating
2705 over the instruction sequence faster, and allow the garbage
2706 collector to reclaim the memory used by the notes. */
2707 remove_unnecessary_notes ();
2709 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2710 tree in sensible shape. So, we just recalculate it here. */
2711 if (cfun
->x_whole_function_mode_p
)
2716 /* If we are reconsidering an inline function
2717 at the end of compilation, skip the stuff for making it inline. */
2719 if (DECL_SAVED_INSNS (decl
) == 0)
2725 /* If this is nested inside an inlined external function, pretend
2726 it was only declared. Since we cannot inline such functions,
2727 generating code for this one is not only not necessary but will
2728 confuse some debugging output writers. */
2729 for (parent
= DECL_CONTEXT (current_function_decl
);
2730 parent
!= NULL_TREE
;
2731 parent
= get_containing_scope (parent
))
2732 if (TREE_CODE (parent
) == FUNCTION_DECL
2733 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2735 DECL_INITIAL (decl
) = 0;
2736 goto exit_rest_of_compilation
;
2739 /* If requested, consider whether to make this function inline. */
2740 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2741 || flag_inline_functions
)
2743 timevar_push (TV_INTEGRATION
);
2744 lose
= function_cannot_inline_p (decl
);
2745 timevar_pop (TV_INTEGRATION
);
2746 if (lose
|| ! optimize
)
2748 if (warn_inline
&& DECL_INLINE (decl
))
2749 warning_with_decl (decl
, lose
);
2750 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2751 /* Don't really compile an extern inline function.
2752 If we can't make it inline, pretend
2753 it was only declared. */
2754 if (DECL_EXTERNAL (decl
))
2756 DECL_INITIAL (decl
) = 0;
2757 goto exit_rest_of_compilation
;
2761 /* ??? Note that this has the effect of making it look
2762 like "inline" was specified for a function if we choose
2763 to inline it. This isn't quite right, but it's
2764 probably not worth the trouble to fix. */
2765 inlinable
= DECL_INLINE (decl
) = 1;
2768 insns
= get_insns ();
2770 /* Dump the rtl code if we are dumping rtl. */
2772 if (open_dump_file (DFI_rtl
, decl
))
2774 if (DECL_SAVED_INSNS (decl
))
2775 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2776 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2779 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2780 sorts of eh initialization. Delay this until after the
2781 initial rtl dump so that we can see the original nesting. */
2782 convert_from_eh_region_ranges ();
2784 /* If function is inline, and we don't yet know whether to
2785 compile it by itself, defer decision till end of compilation.
2786 finish_compilation will call rest_of_compilation again
2787 for those functions that need to be output. Also defer those
2788 functions that we are supposed to defer. */
2791 || (DECL_INLINE (decl
)
2792 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2793 && ! flag_keep_inline_functions
)
2794 || DECL_EXTERNAL (decl
))))
2795 DECL_DEFER_OUTPUT (decl
) = 1;
2797 if (DECL_INLINE (decl
))
2798 /* DWARF wants seperate debugging info for abstract and
2799 concrete instances of all inline functions, including those
2800 declared inline but not inlined, and those inlined even
2801 though they weren't declared inline. Conveniently, that's
2802 what DECL_INLINE means at this point. */
2803 note_deferral_of_defined_inline_function (decl
);
2805 if (DECL_DEFER_OUTPUT (decl
))
2807 /* If -Wreturn-type, we have to do a bit of compilation. We just
2808 want to call jump_optimize to figure out whether or not we can
2809 fall off the end of the function; we do the minimum amount of
2810 work necessary to make that safe. And, we set optimize to zero
2811 to keep jump_optimize from working too hard. */
2812 if (warn_return_type
)
2814 int saved_optimize
= optimize
;
2817 find_exception_handler_labels ();
2818 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2819 !JUMP_AFTER_REGSCAN
);
2820 optimize
= saved_optimize
;
2823 current_function_nothrow
= nothrow_function_p ();
2824 if (current_function_nothrow
)
2825 /* Now we know that this can't throw; set the flag for the benefit
2826 of other functions later in this translation unit. */
2827 TREE_NOTHROW (current_function_decl
) = 1;
2829 timevar_push (TV_INTEGRATION
);
2830 save_for_inline (decl
);
2831 timevar_pop (TV_INTEGRATION
);
2832 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2833 goto exit_rest_of_compilation
;
2836 /* If specified extern inline but we aren't inlining it, we are
2837 done. This goes for anything that gets here with DECL_EXTERNAL
2838 set, not just things with DECL_INLINE. */
2839 if (DECL_EXTERNAL (decl
))
2840 goto exit_rest_of_compilation
;
2845 /* Initialize some variables used by the optimizers. */
2846 init_function_for_compilation ();
2848 if (! DECL_DEFER_OUTPUT (decl
))
2849 TREE_ASM_WRITTEN (decl
) = 1;
2851 /* Now that integrate will no longer see our rtl, we need not
2852 distinguish between the return value of this function and the
2853 return value of called functions. Also, we can remove all SETs
2854 of subregs of hard registers; they are only here because of
2856 rtx_equal_function_value_matters
= 0;
2857 purge_hard_subreg_sets (get_insns ());
2859 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2860 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2861 goto exit_rest_of_compilation
;
2863 /* We may have potential sibling or tail recursion sites. Select one
2864 (of possibly multiple) methods of performing the call. */
2865 if (flag_optimize_sibling_calls
)
2867 timevar_push (TV_JUMP
);
2868 open_dump_file (DFI_sibling
, decl
);
2870 optimize_sibling_and_tail_recursive_calls ();
2872 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2873 timevar_pop (TV_JUMP
);
2876 /* Complete generation of exception handling code. */
2877 find_exception_handler_labels ();
2880 timevar_push (TV_JUMP
);
2881 open_dump_file (DFI_eh
, decl
);
2883 finish_eh_generation ();
2885 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2886 timevar_pop (TV_JUMP
);
2890 /* If we are doing position-independent code generation, now
2891 is the time to output special prologues and epilogues.
2892 We do not want to do this earlier, because it just clutters
2893 up inline functions with meaningless insns. */
2898 insns
= get_insns ();
2900 /* Copy any shared structure that should not be shared. */
2901 unshare_all_rtl (current_function_decl
, insns
);
2903 #ifdef SETJMP_VIA_SAVE_AREA
2904 /* This must be performed before virutal register instantiation. */
2905 if (current_function_calls_alloca
)
2906 optimize_save_area_alloca (insns
);
2909 /* Instantiate all virtual registers. */
2910 instantiate_virtual_regs (current_function_decl
, insns
);
2912 open_dump_file (DFI_jump
, decl
);
2914 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2915 are initialized and to compute whether control can drop off the end
2918 timevar_push (TV_JUMP
);
2919 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2920 before jump optimization switches branch directions. */
2921 expected_value_to_br_prob ();
2923 reg_scan (insns
, max_reg_num (), 0);
2924 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2925 JUMP_AFTER_REGSCAN
);
2927 timevar_pop (TV_JUMP
);
2929 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2930 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2932 close_dump_file (DFI_jump
, print_rtl
, insns
);
2933 goto exit_rest_of_compilation
;
2936 timevar_push (TV_JUMP
);
2940 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2943 /* ??? Run if-conversion before delete_null_pointer_checks,
2944 since the later does not preserve the CFG. This should
2945 be changed -- no since converting if's that are going to
2947 timevar_push (TV_IFCVT
);
2949 timevar_pop (TV_IFCVT
);
2951 /* Try to identify useless null pointer tests and delete them. */
2952 if (flag_delete_null_pointer_checks
)
2953 delete_null_pointer_checks (insns
);
2956 /* Jump optimization, and the removal of NULL pointer checks, may
2957 have reduced the number of instructions substantially. CSE, and
2958 future passes, allocate arrays whose dimensions involve the
2959 maximum instruction UID, so if we can reduce the maximum UID
2960 we'll save big on memory. */
2961 renumber_insns (rtl_dump_file
);
2962 timevar_pop (TV_JUMP
);
2964 close_dump_file (DFI_jump
, print_rtl
, insns
);
2968 /* Perform common subexpression elimination.
2969 Nonzero value from `cse_main' means that jumps were simplified
2970 and some code may now be unreachable, so do
2971 jump optimization again. */
2975 open_dump_file (DFI_cse
, decl
);
2976 timevar_push (TV_CSE
);
2978 reg_scan (insns
, max_reg_num (), 1);
2980 if (flag_thread_jumps
)
2982 timevar_push (TV_JUMP
);
2983 thread_jumps (insns
, max_reg_num (), 1);
2984 timevar_pop (TV_JUMP
);
2987 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2989 /* If we are not running more CSE passes, then we are no longer
2990 expecting CSE to be run. But always rerun it in a cheap mode. */
2991 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2993 if (tem
|| optimize
> 1)
2995 timevar_push (TV_JUMP
);
2996 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2997 !JUMP_AFTER_REGSCAN
);
2998 timevar_pop (TV_JUMP
);
3001 /* Run this after jump optmizations remove all the unreachable code
3002 so that unreachable code will not keep values live. */
3003 delete_trivially_dead_insns (insns
, max_reg_num ());
3005 /* Try to identify useless null pointer tests and delete them. */
3006 if (flag_delete_null_pointer_checks
)
3008 timevar_push (TV_JUMP
);
3009 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3013 delete_null_pointer_checks (insns
);
3014 timevar_pop (TV_JUMP
);
3017 /* The second pass of jump optimization is likely to have
3018 removed a bunch more instructions. */
3019 renumber_insns (rtl_dump_file
);
3021 timevar_pop (TV_CSE
);
3022 close_dump_file (DFI_cse
, print_rtl
, insns
);
3025 open_dump_file (DFI_addressof
, decl
);
3027 purge_addressof (insns
);
3028 reg_scan (insns
, max_reg_num (), 1);
3030 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3034 if (optimize
> 0 && flag_ssa
)
3036 /* Convert to SSA form. */
3038 timevar_push (TV_TO_SSA
);
3039 open_dump_file (DFI_ssa
, decl
);
3041 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3045 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3046 timevar_pop (TV_TO_SSA
);
3048 /* The SSA implementation uses basic block numbers in its phi
3049 nodes. Thus, changing the control-flow graph or the basic
3050 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3051 may cause problems. */
3055 /* Remove dead code. */
3057 timevar_push (TV_DEAD_CODE_ELIM
);
3058 open_dump_file (DFI_dce
, decl
);
3060 insns
= get_insns ();
3061 eliminate_dead_code();
3063 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3064 timevar_pop (TV_DEAD_CODE_ELIM
);
3067 /* Convert from SSA form. */
3069 timevar_push (TV_FROM_SSA
);
3070 open_dump_file (DFI_ussa
, decl
);
3072 convert_from_ssa ();
3073 /* New registers have been created. Rescan their usage. */
3074 reg_scan (insns
, max_reg_num (), 1);
3075 /* Life analysis used in SSA adds log_links but these
3076 shouldn't be there until the flow stage, so clear
3078 clear_log_links (insns
);
3080 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3081 timevar_pop (TV_FROM_SSA
);
3086 /* Perform global cse. */
3088 if (optimize
> 0 && flag_gcse
)
3090 int save_csb
, save_cfj
;
3093 timevar_push (TV_GCSE
);
3094 open_dump_file (DFI_gcse
, decl
);
3096 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3098 tem
= gcse_main (insns
, rtl_dump_file
);
3100 save_csb
= flag_cse_skip_blocks
;
3101 save_cfj
= flag_cse_follow_jumps
;
3102 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3104 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3106 if (flag_expensive_optimizations
)
3108 timevar_push (TV_CSE
);
3109 reg_scan (insns
, max_reg_num (), 1);
3110 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3111 timevar_pop (TV_CSE
);
3112 cse_not_expected
= !flag_rerun_cse_after_loop
;
3115 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3116 things up. Then possibly re-run CSE again. */
3120 timevar_push (TV_JUMP
);
3121 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3122 !JUMP_AFTER_REGSCAN
);
3123 timevar_pop (TV_JUMP
);
3125 if (flag_expensive_optimizations
)
3127 timevar_push (TV_CSE
);
3128 reg_scan (insns
, max_reg_num (), 1);
3129 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3130 timevar_pop (TV_CSE
);
3134 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3135 timevar_pop (TV_GCSE
);
3138 flag_cse_skip_blocks
= save_csb
;
3139 flag_cse_follow_jumps
= save_cfj
;
3142 /* Move constant computations out of loops. */
3146 timevar_push (TV_LOOP
);
3147 open_dump_file (DFI_loop
, decl
);
3149 if (flag_rerun_loop_opt
)
3151 /* We only want to perform unrolling once. */
3153 loop_optimize (insns
, rtl_dump_file
, 0);
3155 /* The first call to loop_optimize makes some instructions
3156 trivially dead. We delete those instructions now in the
3157 hope that doing so will make the heuristics in loop work
3158 better and possibly speed up compilation. */
3159 delete_trivially_dead_insns (insns
, max_reg_num ());
3161 /* The regscan pass is currently necessary as the alias
3162 analysis code depends on this information. */
3163 reg_scan (insns
, max_reg_num (), 1);
3165 loop_optimize (insns
, rtl_dump_file
,
3166 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3168 close_dump_file (DFI_loop
, print_rtl
, insns
);
3169 timevar_pop (TV_LOOP
);
3176 timevar_push (TV_CSE2
);
3177 open_dump_file (DFI_cse2
, decl
);
3179 if (flag_rerun_cse_after_loop
)
3181 /* Running another jump optimization pass before the second
3182 cse pass sometimes simplifies the RTL enough to allow
3183 the second CSE pass to do a better job. Jump_optimize can change
3184 max_reg_num so we must rerun reg_scan afterwards.
3185 ??? Rework to not call reg_scan so often. */
3186 timevar_push (TV_JUMP
);
3188 /* The previous call to loop_optimize makes some instructions
3189 trivially dead. We delete those instructions now in the
3190 hope that doing so will make the heuristics in jump work
3191 better and possibly speed up compilation. */
3192 delete_trivially_dead_insns (insns
, max_reg_num ());
3194 reg_scan (insns
, max_reg_num (), 0);
3195 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3196 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3198 timevar_push (TV_IFCVT
);
3200 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3204 timevar_pop(TV_IFCVT
);
3206 timevar_pop (TV_JUMP
);
3208 reg_scan (insns
, max_reg_num (), 0);
3209 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3213 timevar_push (TV_JUMP
);
3214 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3215 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3216 timevar_pop (TV_JUMP
);
3220 if (flag_thread_jumps
)
3222 /* This pass of jump threading straightens out code
3223 that was kinked by loop optimization. */
3224 timevar_push (TV_JUMP
);
3225 reg_scan (insns
, max_reg_num (), 0);
3226 thread_jumps (insns
, max_reg_num (), 0);
3227 timevar_pop (TV_JUMP
);
3230 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3231 timevar_pop (TV_CSE2
);
3236 cse_not_expected
= 1;
3240 /* Do control and data flow analysis; wrote some of the results to
3243 timevar_push (TV_FLOW
);
3244 open_dump_file (DFI_cfg
, decl
);
3246 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3248 check_function_return_warnings ();
3250 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3252 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3254 timevar_push (TV_BRANCH_PROB
);
3255 open_dump_file (DFI_bp
, decl
);
3259 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3260 timevar_pop (TV_BRANCH_PROB
);
3263 open_dump_file (DFI_life
, decl
);
3268 /* Discover and record the loop depth at the head of each basic
3269 block. The loop infrastructure does the real job for us. */
3270 flow_loops_find (&loops
, LOOP_TREE
);
3272 /* Estimate using heuristics if no profiling info is available. */
3273 if (flag_guess_branch_prob
)
3274 estimate_probability (&loops
);
3277 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3279 flow_loops_free (&loops
);
3281 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3282 mark_constant_function ();
3283 timevar_pop (TV_FLOW
);
3285 register_life_up_to_date
= 1;
3288 if (warn_uninitialized
|| extra_warnings
)
3290 uninitialized_vars_warning (DECL_INITIAL (decl
));
3292 setjmp_args_warning ();
3295 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3299 /* If -opt, try combining insns through substitution. */
3303 int rebuild_jump_labels_after_combine
= 0;
3305 timevar_push (TV_COMBINE
);
3306 open_dump_file (DFI_combine
, decl
);
3308 rebuild_jump_labels_after_combine
3309 = combine_instructions (insns
, max_reg_num ());
3311 /* Combining insns may have turned an indirect jump into a
3312 direct jump. Rebuid the JUMP_LABEL fields of jumping
3314 if (rebuild_jump_labels_after_combine
)
3316 timevar_push (TV_JUMP
);
3317 rebuild_jump_labels (insns
);
3318 timevar_pop (TV_JUMP
);
3320 timevar_push (TV_FLOW
);
3321 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3324 /* Blimey. We've got to have the CFG up to date for the call to
3325 if_convert below. However, the random deletion of blocks
3326 without updating life info can wind up with Wierd Stuff in
3327 global_live_at_end. We then run sched1, which updates things
3328 properly, discovers the wierdness and aborts. */
3329 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3330 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3331 | PROP_SCAN_DEAD_CODE
);
3333 timevar_pop (TV_FLOW
);
3336 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3337 timevar_pop (TV_COMBINE
);
3342 /* Rerun if-conversion, as combine may have simplified things enough to
3343 now meet sequence length restrictions. */
3346 timevar_push (TV_IFCVT
);
3347 open_dump_file (DFI_ce
, decl
);
3353 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3354 timevar_pop (TV_IFCVT
);
3357 /* Register allocation pre-pass, to reduce number of moves
3358 necessary for two-address machines. */
3359 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3361 timevar_push (TV_REGMOVE
);
3362 open_dump_file (DFI_regmove
, decl
);
3364 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3366 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3367 timevar_pop (TV_REGMOVE
);
3372 /* Any of the several passes since flow1 will have munged register
3373 lifetime data a bit. */
3375 register_life_up_to_date
= 0;
3377 #ifdef OPTIMIZE_MODE_SWITCHING
3378 timevar_push (TV_GCSE
);
3380 if (optimize_mode_switching (NULL
))
3382 /* We did work, and so had to regenerate global life information.
3383 Take advantage of this and don't re-recompute register life
3384 information below. */
3385 register_life_up_to_date
= 1;
3388 timevar_pop (TV_GCSE
);
3391 #ifdef INSN_SCHEDULING
3393 /* Print function header into sched dump now
3394 because doing the sched analysis makes some of the dump. */
3395 if (optimize
> 0 && flag_schedule_insns
)
3397 timevar_push (TV_SCHED
);
3398 open_dump_file (DFI_sched
, decl
);
3400 /* Do control and data sched analysis,
3401 and write some of the results to dump file. */
3403 schedule_insns (rtl_dump_file
);
3405 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3406 timevar_pop (TV_SCHED
);
3410 /* Register lifetime information was updated as part of verifying
3412 register_life_up_to_date
= 1;
3416 /* Determine if the current function is a leaf before running reload
3417 since this can impact optimizations done by the prologue and
3418 epilogue thus changing register elimination offsets. */
3419 current_function_is_leaf
= leaf_function_p ();
3421 timevar_push (TV_LOCAL_ALLOC
);
3422 open_dump_file (DFI_lreg
, decl
);
3424 /* Allocate pseudo-regs that are used only within 1 basic block.
3426 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3427 jump optimizer after register allocation and reloading are finished. */
3429 if (! register_life_up_to_date
)
3430 recompute_reg_usage (insns
, ! optimize_size
);
3431 regclass (insns
, max_reg_num (), rtl_dump_file
);
3432 rebuild_label_notes_after_reload
= local_alloc ();
3434 timevar_pop (TV_LOCAL_ALLOC
);
3436 if (dump_file
[DFI_lreg
].enabled
)
3438 timevar_push (TV_DUMP
);
3440 dump_flow_info (rtl_dump_file
);
3441 dump_local_alloc (rtl_dump_file
);
3443 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3444 timevar_pop (TV_DUMP
);
3449 timevar_push (TV_GLOBAL_ALLOC
);
3450 open_dump_file (DFI_greg
, decl
);
3452 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3453 pass fixing up any insns that are invalid. */
3456 failure
= global_alloc (rtl_dump_file
);
3459 build_insn_chain (insns
);
3460 failure
= reload (insns
, 0);
3463 timevar_pop (TV_GLOBAL_ALLOC
);
3465 if (dump_file
[DFI_greg
].enabled
)
3467 timevar_push (TV_DUMP
);
3469 dump_global_regs (rtl_dump_file
);
3471 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3472 timevar_pop (TV_DUMP
);
3476 goto exit_rest_of_compilation
;
3480 open_dump_file (DFI_postreload
, decl
);
3482 /* Do a very simple CSE pass over just the hard registers. */
3485 timevar_push (TV_RELOAD_CSE_REGS
);
3486 reload_cse_regs (insns
);
3487 timevar_pop (TV_RELOAD_CSE_REGS
);
3490 /* If optimizing, then go ahead and split insns now since we are about
3491 to recompute flow information anyway. Since we can't split insns after
3492 reload, do the splitting unconditionally here to avoid gcc from losing
3500 int old_labelnum
= max_label_num ();
3502 split_all_insns (0);
3503 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3506 /* Register allocation and reloading may have turned an indirect jump into
3507 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3508 jumping instructions. */
3509 if (rebuild_label_notes_after_reload
)
3511 timevar_push (TV_JUMP
);
3513 rebuild_jump_labels (insns
);
3515 timevar_pop (TV_JUMP
);
3518 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3520 /* Re-create the death notes which were deleted during reload. */
3521 timevar_push (TV_FLOW2
);
3522 open_dump_file (DFI_flow2
, decl
);
3524 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3525 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3526 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3528 /* On some machines, the prologue and epilogue code, or parts thereof,
3529 can be represented as RTL. Doing so lets us schedule insns between
3530 it and the rest of the code and also allows delayed branch
3531 scheduling to operate in the epilogue. */
3532 thread_prologue_and_epilogue_insns (insns
);
3537 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3539 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3540 even for machines with possibly nonzero RETURN_POPS_ARGS
3541 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3542 push instructions will have popping returns. */
3543 #ifndef PUSH_ROUNDING
3544 if (!ACCUMULATE_OUTGOING_ARGS
)
3546 combine_stack_adjustments ();
3551 flow2_completed
= 1;
3553 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3554 timevar_pop (TV_FLOW2
);
3556 #ifdef HAVE_peephole2
3557 if (optimize
> 0 && flag_peephole2
)
3559 timevar_push (TV_PEEPHOLE2
);
3560 open_dump_file (DFI_peephole2
, decl
);
3562 peephole2_optimize (rtl_dump_file
);
3564 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3565 timevar_pop (TV_PEEPHOLE2
);
3569 if (optimize
> 0 && flag_rename_registers
)
3571 timevar_push (TV_RENAME_REGISTERS
);
3572 open_dump_file (DFI_rnreg
, decl
);
3574 regrename_optimize ();
3576 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3577 timevar_pop (TV_RENAME_REGISTERS
);
3582 timevar_push (TV_IFCVT2
);
3583 open_dump_file (DFI_ce2
, decl
);
3587 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3588 timevar_pop (TV_IFCVT2
);
3591 #ifdef INSN_SCHEDULING
3592 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3594 timevar_push (TV_SCHED2
);
3595 open_dump_file (DFI_sched2
, decl
);
3597 /* Do control and data sched analysis again,
3598 and write some more of the results to dump file. */
3600 schedule_insns (rtl_dump_file
);
3602 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3603 timevar_pop (TV_SCHED2
);
3609 #ifdef LEAF_REGISTERS
3610 current_function_uses_only_leaf_regs
3611 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3614 if (optimize
> 0 && flag_reorder_blocks
)
3616 timevar_push (TV_REORDER_BLOCKS
);
3617 open_dump_file (DFI_bbro
, decl
);
3619 reorder_basic_blocks ();
3621 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3622 timevar_pop (TV_REORDER_BLOCKS
);
3625 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3626 Also do cross-jumping this time and delete no-op move insns. */
3630 timevar_push (TV_JUMP
);
3631 open_dump_file (DFI_jump2
, decl
);
3633 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3634 !JUMP_AFTER_REGSCAN
);
3636 /* CFG no longer kept up to date. */
3638 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3639 timevar_pop (TV_JUMP
);
3642 /* If a machine dependent reorganization is needed, call it. */
3643 #ifdef MACHINE_DEPENDENT_REORG
3644 open_dump_file (DFI_mach
, decl
);
3646 MACHINE_DEPENDENT_REORG (insns
);
3648 close_dump_file (DFI_mach
, print_rtl
, insns
);
3653 /* If a scheduling pass for delayed branches is to be done,
3654 call the scheduling code. */
3657 if (optimize
> 0 && flag_delayed_branch
)
3659 timevar_push (TV_DBR_SCHED
);
3660 open_dump_file (DFI_dbr
, decl
);
3662 dbr_schedule (insns
, rtl_dump_file
);
3664 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3665 timevar_pop (TV_DBR_SCHED
);
3672 /* ??? Do this before shorten branches so that we aren't creating
3673 insns too late and fail sanity checks in final. */
3674 convert_to_eh_region_ranges ();
3677 /* Shorten branches.
3679 Note this must run before reg-stack because of death note (ab)use
3680 in the ia32 backend. */
3681 timevar_push (TV_SHORTEN_BRANCH
);
3682 shorten_branches (get_insns ());
3683 timevar_pop (TV_SHORTEN_BRANCH
);
3686 timevar_push (TV_REG_STACK
);
3687 open_dump_file (DFI_stack
, decl
);
3689 reg_to_stack (insns
, rtl_dump_file
);
3691 close_dump_file (DFI_stack
, print_rtl
, insns
);
3692 timevar_pop (TV_REG_STACK
);
3696 convert_to_eh_region_ranges ();
3699 current_function_nothrow
= nothrow_function_p ();
3700 if (current_function_nothrow
)
3701 /* Now we know that this can't throw; set the flag for the benefit
3702 of other functions later in this translation unit. */
3703 TREE_NOTHROW (current_function_decl
) = 1;
3705 /* Now turn the rtl into assembler code. */
3707 timevar_push (TV_FINAL
);
3712 /* Get the function's name, as described by its RTL. This may be
3713 different from the DECL_NAME name used in the source file. */
3715 x
= DECL_RTL (decl
);
3716 if (GET_CODE (x
) != MEM
)
3719 if (GET_CODE (x
) != SYMBOL_REF
)
3721 fnname
= XSTR (x
, 0);
3723 assemble_start_function (decl
, fnname
);
3724 final_start_function (insns
, asm_out_file
, optimize
);
3725 final (insns
, asm_out_file
, optimize
, 0);
3726 final_end_function (insns
, asm_out_file
, optimize
);
3728 #ifdef IA64_UNWIND_INFO
3729 /* ??? The IA-64 ".handlerdata" directive must be issued before
3730 the ".endp" directive that closes the procedure descriptor. */
3731 output_function_exception_table ();
3734 assemble_end_function (decl
, fnname
);
3736 #ifndef IA64_UNWIND_INFO
3737 /* Otherwise, it feels unclean to switch sections in the middle. */
3738 output_function_exception_table ();
3742 fflush (asm_out_file
);
3744 /* Release all memory allocated by flow. */
3745 free_basic_block_vars (0);
3747 /* Release all memory held by regsets now. */
3748 regset_release_memory ();
3750 timevar_pop (TV_FINAL
);
3754 /* Write DBX symbols if requested. */
3756 /* Note that for those inline functions where we don't initially
3757 know for certain that we will be generating an out-of-line copy,
3758 the first invocation of this routine (rest_of_compilation) will
3759 skip over this code by doing a `goto exit_rest_of_compilation;'.
3760 Later on, finish_compilation will call rest_of_compilation again
3761 for those inline functions that need to have out-of-line copies
3762 generated. During that call, we *will* be routed past here. */
3764 timevar_push (TV_SYMOUT
);
3765 #ifdef DBX_DEBUGGING_INFO
3766 if (write_symbols
== DBX_DEBUG
)
3767 dbxout_function (decl
);
3770 #ifdef DWARF_DEBUGGING_INFO
3771 if (write_symbols
== DWARF_DEBUG
)
3772 dwarfout_file_scope_decl (decl
, 0);
3775 #ifdef DWARF2_DEBUGGING_INFO
3776 if (write_symbols
== DWARF2_DEBUG
)
3777 dwarf2out_decl (decl
);
3779 timevar_pop (TV_SYMOUT
);
3781 exit_rest_of_compilation
:
3783 /* In case the function was not output,
3784 don't leave any temporary anonymous types
3785 queued up for sdb output. */
3786 #ifdef SDB_DEBUGGING_INFO
3787 if (write_symbols
== SDB_DEBUG
)
3788 sdbout_types (NULL_TREE
);
3791 reload_completed
= 0;
3792 flow2_completed
= 0;
3795 timevar_push (TV_FINAL
);
3797 /* Clear out the insn_length contents now that they are no
3799 init_insn_lengths ();
3801 /* Clear out the real_constant_chain before some of the rtx's
3802 it runs through become garbage. */
3803 clear_const_double_mem ();
3805 /* Show no temporary slots allocated. */
3808 free_basic_block_vars (0);
3810 timevar_pop (TV_FINAL
);
3812 /* Make sure volatile mem refs aren't considered valid operands for
3813 arithmetic insns. We must call this here if this is a nested inline
3814 function, since the above code leaves us in the init_recog state
3815 (from final.c), and the function context push/pop code does not
3816 save/restore volatile_ok.
3818 ??? Maybe it isn't necessary for expand_start_function to call this
3819 anymore if we do it here? */
3821 init_recog_no_volatile ();
3823 /* We're done with this function. Free up memory if we can. */
3824 free_after_parsing (cfun
);
3825 if (! DECL_DEFER_OUTPUT (decl
))
3826 free_after_compilation (cfun
);
3831 timevar_pop (TV_REST_OF_COMPILATION
);
3841 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3842 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3843 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3844 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3845 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3846 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"));
3848 for (i
= ARRAY_SIZE (f_options
); i
--;)
3850 const char *description
= f_options
[i
].description
;
3852 if (description
!= NULL
&& * description
!= 0)
3853 printf (" -f%-21s %s\n",
3854 f_options
[i
].string
, description
);
3857 printf (_(" -O[number] Set optimisation level to [number]\n"));
3858 printf (_(" -Os Optimise for space rather than speed\n"));
3859 for (i
= sizeof (compiler_params
); i
--;)
3861 const char *description
= compiler_params
[i
].help
;
3862 const int length
= 21-strlen(compiler_params
[i
].option
);
3864 if (description
!= NULL
&& * description
!= 0)
3865 printf (" --param %s=<value>%.*s%s\n",
3866 compiler_params
[i
].option
,
3867 length
> 0 ? length
: 1, " ",
3870 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3871 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3872 printf (_(" -w Suppress warnings\n"));
3873 printf (_(" -W Enable extra warnings\n"));
3875 for (i
= ARRAY_SIZE (W_options
); i
--;)
3877 const char *description
= W_options
[i
].description
;
3879 if (description
!= NULL
&& * description
!= 0)
3880 printf (" -W%-21s %s\n",
3881 W_options
[i
].string
, description
);
3884 printf (_(" -Wunused Enable unused warnings\n"));
3885 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3886 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3887 printf (_(" -p Enable function profiling\n"));
3888 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3889 printf (_(" -a Enable block profiling \n"));
3891 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3892 printf (_(" -ax Enable jump profiling \n"));
3894 printf (_(" -o <file> Place output into <file> \n"));
3896 -G <number> Put global and static data smaller than <number>\n\
3897 bytes into a special section (on some targets)\n"));
3899 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3901 if (debug_args
[i
].description
!= NULL
)
3902 printf (" -g%-21s %s\n",
3903 debug_args
[i
].arg
, debug_args
[i
].description
);
3906 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3907 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3908 printf (_(" -version Display the compiler's version\n"));
3909 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3910 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3911 #if defined INSN_SCHEDULING
3912 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3914 printf (_(" --help Display this information\n"));
3919 /* Display descriptions of language specific options.
3920 If there is no description, note that there is an undocumented option.
3921 If the description is empty, do not display anything. (This allows
3922 options to be deliberately undocumented, for whatever reason).
3923 If the option string is missing, then this is a marker, indicating
3924 that the description string is in fact the name of a language, whose
3925 language specific options are to follow. */
3927 if (ARRAY_SIZE (documented_lang_options
) > 1)
3929 printf (_("\nLanguage specific options:\n"));
3931 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3933 const char *description
= documented_lang_options
[i
].description
;
3934 const char *option
= documented_lang_options
[i
].option
;
3936 if (description
== NULL
)
3941 printf (_(" %-23.23s [undocumented]\n"), option
);
3943 else if (*description
== 0)
3945 else if (option
== NULL
)
3949 (_("\nThere are undocumented %s specific options as well.\n"),
3953 printf (_("\n Options for %s:\n"), description
);
3958 printf (" %-23.23s %s\n", option
, description
);
3963 printf (_("\nThere are undocumented %s specific options as well.\n"),
3966 display_target_options ();
3970 display_target_options ()
3974 if (ARRAY_SIZE (target_switches
) > 1
3975 #ifdef TARGET_OPTIONS
3976 || ARRAY_SIZE (target_options
) > 1
3984 printf (_("\nTarget specific options:\n"));
3986 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3988 const char *option
= target_switches
[i
].name
;
3989 const char *description
= target_switches
[i
].description
;
3991 if (option
== NULL
|| *option
== 0)
3993 else if (description
== NULL
)
3998 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4000 else if (* description
!= 0)
4001 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
4004 #ifdef TARGET_OPTIONS
4005 for (i
= ARRAY_SIZE (target_options
); i
--;)
4007 const char *option
= target_options
[i
].prefix
;
4008 const char *description
= target_options
[i
].description
;
4010 if (option
== NULL
|| *option
== 0)
4012 else if (description
== NULL
)
4017 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4019 else if (* description
!= 0)
4020 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
4026 printf (_("\nThere are undocumented target specific options as well.\n"));
4028 printf (_(" They exist, but they are not documented.\n"));
4033 /* Parse a -d... comand line switch. */
4036 decode_d_option (arg
)
4045 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4046 dump_file
[i
].enabled
= 1;
4052 flag_print_asm_name
= 1;
4055 flag_dump_rtl_in_asm
= 1;
4056 flag_print_asm_name
= 1;
4059 graph_dump_format
= vcg
;
4062 rtl_dump_and_exit
= 1;
4067 case 'D': /* These are handled by the preprocessor. */
4073 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4074 if (c
== dump_file
[i
].debug_switch
)
4076 dump_file
[i
].enabled
= 1;
4081 warning ("unrecognized gcc debugging option: %c", c
);
4086 /* Parse a -f... comand line switch. ARG is the value after the -f.
4087 It is safe to access 'ARG - 2' to generate the full switch name.
4088 Return the number of strings consumed. */
4091 decode_f_option (arg
)
4095 const char *option_value
= NULL
;
4097 /* Search for the option in the table of binary f options. */
4098 for (j
= ARRAY_SIZE (f_options
); j
--;)
4100 if (!strcmp (arg
, f_options
[j
].string
))
4102 *f_options
[j
].variable
= f_options
[j
].on_value
;
4106 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4107 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4109 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4114 if (!strcmp (arg
, "fast-math"))
4115 set_fast_math_flags();
4116 else if (!strcmp (arg
, "no-fast-math"))
4117 set_no_fast_math_flags();
4118 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4119 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4122 read_integral_parameter (option_value
, arg
- 2,
4124 set_param_value ("max-inline-insns", val
);
4126 #ifdef INSN_SCHEDULING
4127 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4128 fix_sched_param ("verbose", option_value
);
4130 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4131 fix_register (option_value
, 1, 1);
4132 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4133 fix_register (option_value
, 0, 1);
4134 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4135 fix_register (option_value
, 0, 0);
4136 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4137 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4138 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4140 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4141 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4142 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4143 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4145 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4146 else if ((option_value
4147 = skip_leading_substring (arg
, "stack-limit-register=")))
4149 int reg
= decode_reg_name (option_value
);
4151 error ("unrecognized register name `%s'", option_value
);
4153 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4155 else if ((option_value
4156 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4159 nm
= ggc_strdup (option_value
);
4160 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4162 else if ((option_value
4163 = skip_leading_substring (arg
, "message-length=")))
4164 diagnostic_message_length_per_line
=
4165 read_integral_parameter (option_value
, arg
- 2,
4166 diagnostic_message_length_per_line
);
4167 else if ((option_value
4168 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4170 if (!strcmp (option_value
, "once"))
4171 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4172 else if (!strcmp (option_value
, "every-line"))
4173 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4175 error ("Unrecognized option `%s'", arg
- 2);
4177 else if (!strcmp (arg
, "no-stack-limit"))
4178 stack_limit_rtx
= NULL_RTX
;
4179 else if (!strcmp (arg
, "preprocessed"))
4180 /* Recognise this switch but do nothing. This prevents warnings
4181 about an unrecognized switch if cpplib has not been linked in. */
4189 /* Parse a -W... comand line switch. ARG is the value after the -W.
4190 It is safe to access 'ARG - 2' to generate the full switch name.
4191 Return the number of strings consumed. */
4194 decode_W_option (arg
)
4197 const char *option_value
= NULL
;
4200 /* Search for the option in the table of binary W options. */
4202 for (j
= ARRAY_SIZE (W_options
); j
--;)
4204 if (!strcmp (arg
, W_options
[j
].string
))
4206 *W_options
[j
].variable
= W_options
[j
].on_value
;
4210 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4211 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4213 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4218 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4220 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4222 if (id_clash_len
!= -1)
4225 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4227 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4229 warn_larger_than
= larger_than_size
!= -1;
4231 else if (!strcmp (arg
, "unused"))
4235 else if (!strcmp (arg
, "no-unused"))
4245 /* Parse a -g... comand line switch. ARG is the value after the -g.
4246 It is safe to access 'ARG - 2' to generate the full switch name.
4247 Return the number of strings consumed. */
4250 decode_g_option (arg
)
4254 /* A lot of code assumes write_symbols == NO_DEBUG if the
4255 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4256 of what debugging type has been selected). This records the
4257 selected type. It is an error to specify more than one
4259 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4260 /* Non-zero if debugging format has been explicitly set.
4261 -g and -ggdb don't explicitly set the debugging format so
4262 -gdwarf -g3 is equivalent to -gdwarf3. */
4263 static int type_explicitly_set_p
= 0;
4264 /* Indexed by enum debug_info_type. */
4265 static const char *debug_type_names
[] =
4267 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4270 /* The maximum admissible debug level value. */
4271 static const unsigned max_debug_level
= 3;
4273 /* Look up ARG in the table. */
4274 for (da
= debug_args
; da
->arg
; da
++)
4276 const int da_len
= strlen (da
->arg
);
4278 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4280 enum debug_info_type type
= da
->debug_type
;
4281 const char *p
= arg
+ da_len
;
4283 if (*p
&& (*p
< '0' || *p
> '9'))
4286 /* A debug flag without a level defaults to level 2.
4287 Note we do not want to call read_integral_parameter
4288 for that case since it will call atoi which
4291 ??? We may want to generalize the interface to
4292 read_integral_parameter to better handle this case
4293 if this case shows up often. */
4295 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4299 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4301 error ("use -gdwarf -g%d for DWARF v1, level %d",
4304 error ("use -gdwarf-2 for DWARF v2");
4307 if (level
> max_debug_level
)
4310 ignoring option `%s' due to invalid debug level specification",
4312 level
= debug_info_level
;
4315 if (type
== NO_DEBUG
)
4317 type
= PREFERRED_DEBUGGING_TYPE
;
4319 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4321 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4322 type
= DWARF2_DEBUG
;
4324 #ifdef DBX_DEBUGGING_INFO
4331 if (type
== NO_DEBUG
)
4332 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4334 /* Does it conflict with an already selected type? */
4335 if (type_explicitly_set_p
4336 /* -g/-ggdb don't conflict with anything. */
4337 && da
->debug_type
!= NO_DEBUG
4338 && type
!= selected_debug_type
)
4339 warning ("`%s' ignored, conflicts with `-g%s'",
4340 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4343 /* If the format has already been set, -g/-ggdb
4344 only change the debug level. */
4345 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4346 /* Don't change debugging type. */
4350 selected_debug_type
= type
;
4351 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4354 write_symbols
= (level
== 0
4356 : selected_debug_type
);
4357 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4358 debug_info_level
= (enum debug_info_level
) level
;
4371 /* Decode the first argument in the argv as a language-independent option.
4372 Return the number of strings consumed. */
4375 independent_decode_option (argc
, argv
)
4379 char *arg
= argv
[0];
4381 if (arg
[0] != '-' || arg
[1] == 0)
4393 if (!strcmp (arg
, "-help"))
4396 exit_after_options
= 1;
4399 if (!strcmp (arg
, "-target-help"))
4401 display_target_options ();
4402 exit_after_options
= 1;
4405 if (!strcmp (arg
, "-version"))
4407 print_version (stderr
, "");
4408 exit_after_options
= 1;
4411 /* Handle '--param <name>=<value>'. */
4412 if (strcmp (arg
, "-param") == 0)
4418 error ("-param option missing argument");
4422 /* Get the '<name>=<value>' parameter. */
4424 /* Look for the `='. */
4425 equal
= strchr (arg
, '=');
4427 error ("invalid --param option: %s", arg
);
4432 /* Zero out the `=' sign so that we get two separate strings. */
4434 /* Figure out what value is specified. */
4435 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4436 if (val
!= INVALID_PARAM_VAL
)
4437 set_param_value (arg
, val
);
4439 error ("invalid parameter value `%s'", equal
+ 1);
4454 /* Already been treated in main (). Do nothing. */
4458 set_target_switch (arg
+ 1);
4462 return decode_f_option (arg
+ 1);
4465 return decode_g_option (arg
+ 1);
4468 if (!strcmp (arg
, "dumpbase"))
4473 dump_base_name
= argv
[1];
4477 decode_d_option (arg
+ 1);
4481 if (!strcmp (arg
, "pedantic"))
4483 else if (!strcmp (arg
, "pedantic-errors"))
4484 flag_pedantic_errors
= pedantic
= 1;
4485 else if (arg
[1] == 0)
4492 if (!strcmp (arg
, "quiet"))
4499 if (!strcmp (arg
, "version"))
4507 inhibit_warnings
= 1;
4516 /* We save the value of warn_uninitialized, since if they put
4517 -Wuninitialized on the command line, we need to generate a
4518 warning about not using it without also specifying -O. */
4519 if (warn_uninitialized
!= 1)
4520 warn_uninitialized
= 2;
4523 return decode_W_option (arg
+ 1);
4529 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4530 warning ("`-a' option (basic block profile) not supported");
4532 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4535 else if (!strcmp (arg
, "ax"))
4537 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4538 warning ("`-ax' option (jump profiling) not supported");
4540 profile_block_flag
= (!profile_block_flag
4541 || profile_block_flag
== 2) ? 2 : 3;
4544 else if (!strncmp (arg
, "aux-info", 8))
4546 flag_gen_aux_info
= 1;
4552 aux_info_file_name
= argv
[1];
4556 aux_info_file_name
= arg
+ 8;
4568 asm_file_name
= argv
[1];
4583 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4588 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4592 if (g_switch_val
== -1)
4596 g_switch_set
= TRUE
;
4597 g_switch_value
= g_switch_val
;
4607 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4608 Decode command args, then call compile_file.
4609 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4610 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4612 It is not safe to call this function more than once. */
4615 toplev_main (argc
, argv
)
4622 /* save in case md file wants to emit args as a comment. */
4626 p
= argv
[0] + strlen (argv
[0]);
4627 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4631 xmalloc_set_program_name (progname
);
4633 /* LC_CTYPE determines the character set used by the terminal so it has be set
4634 to output messages correctly. */
4636 #ifdef HAVE_LC_MESSAGES
4637 setlocale (LC_CTYPE
, "");
4638 setlocale (LC_MESSAGES
, "");
4640 setlocale (LC_ALL
, "");
4643 (void) bindtextdomain (PACKAGE
, localedir
);
4644 (void) textdomain (PACKAGE
);
4646 /* Install handler for SIGFPE, which may be received while we do
4647 compile-time floating point arithmetic. */
4648 signal (SIGFPE
, float_signal
);
4650 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4652 signal (SIGSEGV
, crash_signal
);
4655 signal (SIGILL
, crash_signal
);
4658 signal (SIGBUS
, crash_signal
);
4661 signal (SIGABRT
, crash_signal
);
4663 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4664 signal (SIGIOT
, crash_signal
);
4667 decl_printable_name
= decl_name
;
4668 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4670 /* Initialize whether `char' is signed. */
4671 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4672 #ifdef DEFAULT_SHORT_ENUMS
4673 /* Initialize how much space enums occupy, by default. */
4674 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4677 /* Initialize the garbage-collector. */
4680 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4681 ggc_add_tree_root (¤t_function_decl
, 1);
4682 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4684 /* Initialize the diagnostics reporting machinery. */
4685 initialize_diagnostics ();
4687 /* Register the language-independent parameters. */
4688 add_params (lang_independent_params
, LAST_PARAM
);
4690 /* Perform language-specific options intialization. */
4691 if (lang_hooks
.init_options
)
4692 (*lang_hooks
.init_options
) ();
4694 /* Scan to see what optimization level has been specified. That will
4695 determine the default value of many flags. */
4696 for (i
= 1; i
< argc
; i
++)
4698 if (!strcmp (argv
[i
], "-O"))
4703 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4705 /* Handle -Os, -O2, -O3, -O69, ... */
4706 char *p
= &argv
[i
][2];
4708 if ((p
[0] == 's') && (p
[1] == 0))
4712 /* Optimizing for size forces optimize to be 2. */
4717 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4718 if (optimize_val
!= -1)
4720 optimize
= optimize_val
;
4730 flag_thread_jumps
= 1;
4732 flag_delayed_branch
= 1;
4734 #ifdef CAN_DEBUG_WITHOUT_FP
4735 flag_omit_frame_pointer
= 1;
4737 flag_guess_branch_prob
= 1;
4742 flag_optimize_sibling_calls
= 1;
4743 flag_cse_follow_jumps
= 1;
4744 flag_cse_skip_blocks
= 1;
4746 flag_expensive_optimizations
= 1;
4747 flag_strength_reduce
= 1;
4748 flag_rerun_cse_after_loop
= 1;
4749 flag_rerun_loop_opt
= 1;
4750 flag_caller_saves
= 1;
4753 #ifdef INSN_SCHEDULING
4754 flag_schedule_insns
= 1;
4755 flag_schedule_insns_after_reload
= 1;
4758 flag_strict_aliasing
= 1;
4759 flag_delete_null_pointer_checks
= 1;
4760 flag_reorder_blocks
= 1;
4765 flag_inline_functions
= 1;
4766 flag_rename_registers
= 1;
4769 if (optimize
< 2 || optimize_size
)
4774 align_functions
= 1;
4777 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4780 set_target_switch ("");
4782 /* Unwind tables are always present in an ABI-conformant IA-64
4783 object file, so the default should be ON. */
4784 #ifdef IA64_UNWIND_INFO
4785 flag_unwind_tables
= IA64_UNWIND_INFO
;
4788 #ifdef OPTIMIZATION_OPTIONS
4789 /* Allow default optimizations to be specified on a per-machine basis. */
4790 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4793 /* Initialize register usage now so switches may override. */
4796 /* Perform normal command line switch decoding. */
4797 for (i
= 1; i
< argc
;)
4800 int indep_processed
;
4802 /* Give the language a chance to decode the option for itself. */
4803 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4805 if (lang_processed
>= 0)
4806 /* Now see if the option also has a language independent meaning.
4807 Some options are both language specific and language independent,
4809 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4812 lang_processed
= -lang_processed
;
4813 indep_processed
= 0;
4816 if (lang_processed
|| indep_processed
)
4817 i
+= MAX (lang_processed
, indep_processed
);
4820 const char *option
= NULL
;
4821 const char *lang
= NULL
;
4824 /* It is possible that the command line switch is not valid for the
4825 current language, but it is valid for another language. In order
4826 to be compatible with previous versions of the compiler (which
4827 did not issue an error message in this case) we check for this
4828 possibility here. If we do find a match, then if extra_warnings
4829 is set we generate a warning message, otherwise we will just
4830 ignore the option. */
4831 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4833 option
= documented_lang_options
[j
].option
;
4836 lang
= documented_lang_options
[j
].description
;
4837 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4841 if (j
!= ARRAY_SIZE (documented_lang_options
))
4845 warning ("Ignoring command line option '%s'", argv
[i
]);
4848 ("(It is valid for %s but not the selected language)",
4852 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4853 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4855 error ("Unrecognized option `%s'", argv
[i
]);
4861 /* All command line options have been processed. */
4862 if (lang_hooks
.post_options
)
4863 (*lang_hooks
.post_options
) ();
4865 if (exit_after_options
)
4868 /* Reflect any language-specific diagnostic option setting. */
4869 reshape_diagnostic_buffer ();
4871 /* Checker uses the frame pointer. */
4872 if (flag_check_memory_usage
)
4873 flag_omit_frame_pointer
= 0;
4877 /* Inlining does not work if not optimizing,
4878 so force it not to be done. */
4882 /* The c_decode_option function and decode_option hook set
4883 this to `2' if -Wall is used, so we can avoid giving out
4884 lots of errors for people who don't realize what -Wall does. */
4885 if (warn_uninitialized
== 1)
4886 warning ("-Wuninitialized is not supported without -O");
4889 #ifdef OVERRIDE_OPTIONS
4890 /* Some machines may reject certain combinations of options. */
4894 /* Set up the align_*_log variables, defaulting them to 1 if they
4895 were still unset. */
4896 if (align_loops
<= 0) align_loops
= 1;
4897 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4898 if (align_jumps
<= 0) align_jumps
= 1;
4899 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4900 if (align_labels
<= 0) align_labels
= 1;
4901 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4902 if (align_functions
<= 0) align_functions
= 1;
4903 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4905 if (profile_block_flag
== 3)
4907 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4908 profile_block_flag
= 2;
4911 /* Unrolling all loops implies that standard loop unrolling must also
4913 if (flag_unroll_all_loops
)
4914 flag_unroll_loops
= 1;
4915 /* Loop unrolling requires that strength_reduction be on also. Silently
4916 turn on strength reduction here if it isn't already on. Also, the loop
4917 unrolling code assumes that cse will be run after loop, so that must
4918 be turned on also. */
4919 if (flag_unroll_loops
)
4921 flag_strength_reduce
= 1;
4922 flag_rerun_cse_after_loop
= 1;
4925 /* Warn about options that are not supported on this machine. */
4926 #ifndef INSN_SCHEDULING
4927 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4928 warning ("instruction scheduling not supported on this target machine");
4931 if (flag_delayed_branch
)
4932 warning ("this target machine does not have delayed branches");
4935 /* Some operating systems do not allow profiling without a frame
4937 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4939 && flag_omit_frame_pointer
)
4941 error ("profiling does not work without a frame pointer");
4942 flag_omit_frame_pointer
= 0;
4945 user_label_prefix
= USER_LABEL_PREFIX
;
4946 if (flag_leading_underscore
!= -1)
4948 /* If the default prefix is more complicated than "" or "_",
4949 issue a warning and ignore this option. */
4950 if (user_label_prefix
[0] == 0 ||
4951 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4953 user_label_prefix
= flag_leading_underscore
? "_" : "";
4956 warning ("-f%sleading-underscore not supported on this target machine",
4957 flag_leading_underscore
? "" : "no-");
4960 /* If we are in verbose mode, write out the version and maybe all the
4961 option flags in use. */
4964 print_version (stderr
, "");
4966 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4969 compile_file (filename
);
4972 return (FATAL_EXIT_CODE
);
4974 return (FATAL_EXIT_CODE
);
4975 return (SUCCESS_EXIT_CODE
);
4978 /* Decode -m switches. */
4979 /* Decode the switch -mNAME. */
4982 set_target_switch (name
)
4986 int valid_target_option
= 0;
4988 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4989 if (!strcmp (target_switches
[j
].name
, name
))
4991 if (target_switches
[j
].value
< 0)
4992 target_flags
&= ~-target_switches
[j
].value
;
4994 target_flags
|= target_switches
[j
].value
;
4995 valid_target_option
= 1;
4998 #ifdef TARGET_OPTIONS
4999 if (!valid_target_option
)
5000 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5002 int len
= strlen (target_options
[j
].prefix
);
5003 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5005 *target_options
[j
].variable
= name
+ len
;
5006 valid_target_option
= 1;
5011 if (!valid_target_option
)
5012 error ("Invalid option `%s'", name
);
5015 /* Print version information to FILE.
5016 Each line begins with INDENT (for the case where FILE is the
5017 assembler output file). */
5020 print_version (file
, indent
)
5025 #define __VERSION__ "[?]"
5029 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5031 "%s%s%s version %s (%s) compiled by CC.\n"
5033 , indent
, *indent
!= 0 ? " " : "",
5034 language_string
, version_string
, TARGET_NAME
,
5035 indent
, __VERSION__
);
5038 /* Print an option value and return the adjusted position in the line.
5039 ??? We don't handle error returns from fprintf (disk full); presumably
5040 other code will catch a disk full though. */
5043 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5046 const char *indent
, *sep
, *term
, *type
, *name
;
5048 /* The ultrix fprintf returns 0 on success, so compute the result we want
5049 here since we need it for the following test. */
5050 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5055 fprintf (file
, "%s", term
);
5060 fprintf (file
, "%s", indent
);
5061 pos
= strlen (indent
);
5063 fprintf (file
, "%s%s%s", sep
, type
, name
);
5068 /* Print active target switches to FILE.
5069 POS is the current cursor position and MAX is the size of a "line".
5070 Each line begins with INDENT and ends with TERM.
5071 Each switch is separated from the next by SEP. */
5074 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5077 const char *indent
, *sep
, *term
;
5082 /* Print the options as passed. */
5084 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5085 _("options passed: "), "");
5087 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5091 if (strcmp (*p
, "-o") == 0)
5097 if (strcmp (*p
, "-quiet") == 0)
5099 if (strcmp (*p
, "-version") == 0)
5104 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5107 fprintf (file
, "%s", term
);
5109 /* Print the -f and -m options that have been enabled.
5110 We don't handle language specific options but printing argv
5113 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5114 _("options enabled: "), "");
5116 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5117 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5118 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5119 "-f", f_options
[j
].string
);
5121 /* Print target specific options. */
5123 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5124 if (target_switches
[j
].name
[0] != '\0'
5125 && target_switches
[j
].value
> 0
5126 && ((target_switches
[j
].value
& target_flags
)
5127 == target_switches
[j
].value
))
5129 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5130 "-m", target_switches
[j
].name
);
5133 #ifdef TARGET_OPTIONS
5134 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5135 if (*target_options
[j
].variable
!= NULL
)
5138 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5139 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5140 prefix
, *target_options
[j
].variable
);
5144 fprintf (file
, "%s", term
);
5147 /* Record the beginning of a new source file, named FILENAME. */
5150 debug_start_source_file (filename
)
5151 register const char *filename ATTRIBUTE_UNUSED
;
5153 #ifdef DBX_DEBUGGING_INFO
5154 if (write_symbols
== DBX_DEBUG
)
5155 dbxout_start_new_source_file (filename
);
5157 #ifdef DWARF_DEBUGGING_INFO
5158 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5159 && write_symbols
== DWARF_DEBUG
)
5160 dwarfout_start_new_source_file (filename
);
5161 #endif /* DWARF_DEBUGGING_INFO */
5162 #ifdef DWARF2_DEBUGGING_INFO
5163 if (write_symbols
== DWARF2_DEBUG
)
5164 dwarf2out_start_source_file (filename
);
5165 #endif /* DWARF2_DEBUGGING_INFO */
5166 #ifdef SDB_DEBUGGING_INFO
5167 if (write_symbols
== SDB_DEBUG
)
5168 sdbout_start_new_source_file (filename
);
5172 /* Record the resumption of a source file. LINENO is the line number in
5173 the source file we are returning to. */
5176 debug_end_source_file (lineno
)
5177 register unsigned lineno ATTRIBUTE_UNUSED
;
5179 #ifdef DBX_DEBUGGING_INFO
5180 if (write_symbols
== DBX_DEBUG
)
5181 dbxout_resume_previous_source_file ();
5183 #ifdef DWARF_DEBUGGING_INFO
5184 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5185 && write_symbols
== DWARF_DEBUG
)
5186 dwarfout_resume_previous_source_file (lineno
);
5187 #endif /* DWARF_DEBUGGING_INFO */
5188 #ifdef DWARF2_DEBUGGING_INFO
5189 if (write_symbols
== DWARF2_DEBUG
)
5190 dwarf2out_end_source_file ();
5191 #endif /* DWARF2_DEBUGGING_INFO */
5192 #ifdef SDB_DEBUGGING_INFO
5193 if (write_symbols
== SDB_DEBUG
)
5194 sdbout_resume_previous_source_file ();
5198 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5199 the tail part of the directive line, i.e. the part which is past the
5200 initial whitespace, #, whitespace, directive-name, whitespace part. */
5203 debug_define (lineno
, buffer
)
5204 register unsigned lineno ATTRIBUTE_UNUSED
;
5205 register const char *buffer ATTRIBUTE_UNUSED
;
5207 #ifdef DWARF_DEBUGGING_INFO
5208 if (write_symbols
== DWARF_DEBUG
)
5209 dwarfout_define (lineno
, buffer
);
5210 #endif /* DWARF_DEBUGGING_INFO */
5211 #ifdef DWARF2_DEBUGGING_INFO
5212 if (write_symbols
== DWARF2_DEBUG
)
5213 dwarf2out_define (lineno
, buffer
);
5214 #endif /* DWARF2_DEBUGGING_INFO */
5217 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5218 the tail part of the directive line, i.e. the part which is past the
5219 initial whitespace, #, whitespace, directive-name, whitespace part. */
5222 debug_undef (lineno
, buffer
)
5223 register unsigned lineno ATTRIBUTE_UNUSED
;
5224 register const char *buffer ATTRIBUTE_UNUSED
;
5226 #ifdef DWARF_DEBUGGING_INFO
5227 if (write_symbols
== DWARF_DEBUG
)
5228 dwarfout_undef (lineno
, buffer
);
5229 #endif /* DWARF_DEBUGGING_INFO */
5230 #ifdef DWARF2_DEBUGGING_INFO
5231 if (write_symbols
== DWARF2_DEBUG
)
5232 dwarf2out_undef (lineno
, buffer
);
5233 #endif /* DWARF2_DEBUGGING_INFO */
5236 /* Returns nonzero if it is appropriate not to emit any debugging
5237 information for BLOCK, because it doesn't contain any instructions.
5238 This may not be the case for blocks containing nested functions, since
5239 we may actually call such a function even though the BLOCK information
5243 debug_ignore_block (block
)
5244 tree block ATTRIBUTE_UNUSED
;
5246 /* Never delete the BLOCK for the outermost scope
5247 of the function; we can refer to names from
5248 that scope even if the block notes are messed up. */
5249 if (is_body_block (block
))
5252 #ifdef DWARF2_DEBUGGING_INFO
5253 if (write_symbols
== DWARF2_DEBUG
)
5254 return dwarf2out_ignore_block (block
);