1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
69 #ifdef DWARF_DEBUGGING_INFO
73 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
74 #include "dwarf2out.h"
77 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
81 #ifdef SDB_DEBUGGING_INFO
85 #ifdef XCOFF_DEBUGGING_INFO
90 /* The extra parameters substantially improve the I/O performance. */
93 vms_fopen (fname
, type
)
97 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
98 fixed arguments, which matches ANSI's specification but not VAXCRTL's
99 pre-ANSI implementation. This hack circumvents the mismatch problem. */
100 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
103 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
104 "deq=64", "fop=tef", "shr=nil");
106 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
109 #define fopen vms_fopen
112 #ifndef DEFAULT_GDB_EXTENSIONS
113 #define DEFAULT_GDB_EXTENSIONS 1
116 /* If more than one debugging type is supported, you must define
117 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
119 This is one long line cause VAXC can't handle a \-newline. */
120 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
121 #ifndef PREFERRED_DEBUGGING_TYPE
122 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
123 #endif /* no PREFERRED_DEBUGGING_TYPE */
124 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
125 so the following code needn't care. */
126 #ifdef DBX_DEBUGGING_INFO
127 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
129 #ifdef SDB_DEBUGGING_INFO
130 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
132 #ifdef DWARF_DEBUGGING_INFO
133 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
135 #ifdef DWARF2_DEBUGGING_INFO
136 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
138 #ifdef XCOFF_DEBUGGING_INFO
139 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
141 #endif /* More than one debugger format enabled. */
143 /* If still not defined, must have been because no debugging formats
145 #ifndef PREFERRED_DEBUGGING_TYPE
146 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
149 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
150 extern char **environ
;
153 /* Carry information from ASM_DECLARE_OBJECT_NAME
154 to ASM_FINISH_DECLARE_OBJECT. */
156 extern int size_directive_output
;
157 extern tree last_assemble_variable_decl
;
159 static void set_target_switch
PARAMS ((const char *));
160 static const char *decl_name
PARAMS ((tree
, int));
162 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
163 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
164 static void compile_file
PARAMS ((const char *));
165 static void display_help
PARAMS ((void));
166 static void display_target_options
PARAMS ((void));
168 static void decode_d_option
PARAMS ((const char *));
169 static int decode_f_option
PARAMS ((const char *));
170 static int decode_W_option
PARAMS ((const char *));
171 static int decode_g_option
PARAMS ((const char *));
172 static unsigned int independent_decode_option
PARAMS ((int, char **));
174 static void print_version
PARAMS ((FILE *, const char *));
175 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
176 const char *, const char *,
177 const char *, const char *));
178 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
179 const char *, const char *));
181 /* Length of line when printing switch values. */
184 /* Name of program invoked, sans directories. */
186 const char *progname
;
188 /* Copy of arguments to toplev_main. */
192 /* Name of current original source file (what was input to cpp).
193 This comes from each #-command in the actual input. */
195 const char *input_filename
;
197 /* Name of top-level original source file (what was input to cpp).
198 This comes from the #-command at the beginning of the actual input.
199 If there isn't any there, then this is the cc1 input file name. */
201 const char *main_input_filename
;
203 /* Current line number in real source file. */
207 /* Nonzero if it is unsafe to create any new pseudo registers. */
210 /* Stack of currently pending input files. */
212 struct file_stack
*input_file_stack
;
214 /* Incremented on each change to input_file_stack. */
215 int input_file_stack_tick
;
217 /* Name to use as base of names for dump output files. */
219 const char *dump_base_name
;
221 /* Bit flags that specify the machine subtype we are compiling for.
222 Bits are tested using macros TARGET_... defined in the tm.h file
223 and set by `-m...' switches. Must be defined in rtlanal.c. */
225 extern int target_flags
;
227 /* Describes a dump file. */
229 struct dump_file_info
231 /* The unique extension to apply, e.g. ".jump". */
232 const char *const extension
;
234 /* The -d<c> character that enables this dump file. */
235 char const debug_switch
;
237 /* True if there is a corresponding graph dump file. */
238 char const graph_dump_p
;
240 /* True if the user selected this dump. */
243 /* True if the files have been initialized (ie truncated). */
247 /* Enumerate the extant dump files. */
286 /* Describes all the dump files. Should be kept in order of the
287 pass and in sync with dump_file_index above.
289 Remaining -d letters:
295 struct dump_file_info dump_file
[DFI_MAX
] =
297 { "rtl", 'r', 0, 0, 0 },
298 { "sibling", 'i', 0, 0, 0 },
299 { "eh", 'h', 0, 0, 0 },
300 { "jump", 'j', 0, 0, 0 },
301 { "cse", 's', 0, 0, 0 },
302 { "addressof", 'F', 0, 0, 0 },
303 { "ssa", 'e', 1, 0, 0 },
304 { "dce", 'X', 1, 0, 0 },
305 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
306 { "gcse", 'G', 1, 0, 0 },
307 { "loop", 'L', 1, 0, 0 },
308 { "cse2", 't', 1, 0, 0 },
309 { "cfg", 'f', 1, 0, 0 },
310 { "bp", 'b', 1, 0, 0 },
311 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "combine", 'c', 1, 0, 0 },
313 { "ce", 'C', 1, 0, 0 },
314 { "regmove", 'N', 1, 0, 0 },
315 { "sched", 'S', 1, 0, 0 },
316 { "lreg", 'l', 1, 0, 0 },
317 { "greg", 'g', 1, 0, 0 },
318 { "postreload", 'o', 1, 0, 0 },
319 { "flow2", 'w', 1, 0, 0 },
320 { "peephole2", 'z', 1, 0, 0 },
321 { "rnreg", 'n', 1, 0, 0 },
322 { "ce2", 'E', 1, 0, 0 },
323 { "sched2", 'R', 1, 0, 0 },
324 { "bbro", 'B', 1, 0, 0 },
325 { "jump2", 'J', 1, 0, 0 },
326 { "mach", 'M', 1, 0, 0 },
327 { "dbr", 'd', 0, 0, 0 },
328 { "stack", 'k', 1, 0, 0 },
331 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
332 static void close_dump_file
PARAMS ((enum dump_file_index
,
333 void (*) (FILE *, rtx
), rtx
));
335 /* Other flags saying which kinds of debugging dump have been requested. */
337 int rtl_dump_and_exit
;
338 int flag_print_asm_name
;
339 static int version_flag
;
340 static char *filename
;
341 enum graph_dump_types graph_dump_format
;
343 /* Name for output file of assembly code, specified with -o. */
347 /* Value of the -G xx switch, and whether it was passed or not. */
351 /* Type(s) of debugging information we are producing (if any).
352 See flags.h for the definitions of the different possible
353 types of debugging information. */
354 enum debug_info_type write_symbols
= NO_DEBUG
;
356 /* Level of debugging information we are producing. See flags.h
357 for the definitions of the different possible levels. */
358 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
360 /* Nonzero means use GNU-only extensions in the generated symbolic
361 debugging information. */
362 /* Currently, this only has an effect when write_symbols is set to
363 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
364 int use_gnu_debug_info_extensions
= 0;
366 /* Nonzero means do optimizations. -O.
367 Particular numeric values stand for particular amounts of optimization;
368 thus, -O2 stores 2 here. However, the optimizations beyond the basic
369 ones are not controlled directly by this variable. Instead, they are
370 controlled by individual `flag_...' variables that are defaulted
371 based on this variable. */
375 /* Nonzero means optimize for size. -Os.
376 The only valid values are zero and non-zero. When optimize_size is
377 non-zero, optimize defaults to 2, but certain individual code
378 bloating optimizations are disabled. */
380 int optimize_size
= 0;
382 /* Number of error messages and warning messages so far. */
385 int warningcount
= 0;
388 /* Nonzero if we should exit after parsing options. */
389 static int exit_after_options
= 0;
391 /* The FUNCTION_DECL for the function currently being compiled,
392 or 0 if between functions. */
393 tree current_function_decl
;
395 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
397 tree current_function_func_begin_label
;
399 /* Pointer to function to compute the name to use to print a declaration.
400 DECL is the declaration in question.
401 VERBOSITY determines what information will be printed:
402 0: DECL_NAME, demangled as necessary.
403 1: and scope information.
404 2: and any other information that might be interesting, such as function
405 parameter types in C++. */
407 const char *(*decl_printable_name
) PARAMS ((tree
, int));
409 /* Pointer to function to compute rtl for a language-specific tree code. */
411 typedef rtx (*lang_expand_expr_t
)
412 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
413 enum expand_modifier modifier
));
415 lang_expand_expr_t lang_expand_expr
= 0;
417 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
419 /* Pointer to function to finish handling an incomplete decl at the
420 end of compilation. */
422 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
424 /* Nonzero if doing dwarf2 duplicate elimination. */
426 int flag_eliminate_dwarf2_dups
= 0;
428 /* Nonzero if generating code to do profiling. */
430 int profile_flag
= 0;
432 /* Nonzero if generating code to do profiling on a line-by-line basis. */
434 int profile_block_flag
;
436 /* Nonzero if generating code to profile program flow graph arcs. */
438 int profile_arc_flag
= 0;
440 /* Nonzero if generating info for gcov to calculate line test coverage. */
442 int flag_test_coverage
= 0;
444 /* Nonzero indicates that branch taken probabilities should be calculated. */
446 int flag_branch_probabilities
= 0;
448 /* Nonzero if basic blocks should be reordered. */
450 int flag_reorder_blocks
= 0;
452 /* Nonzero if registers should be renamed. */
454 int flag_rename_registers
= 0;
456 /* Nonzero for -pedantic switch: warn about anything
457 that standard spec forbids. */
461 /* Temporarily suppress certain warnings.
462 This is set while reading code from a system header file. */
464 int in_system_header
= 0;
466 /* Don't print functions as they are compiled. -quiet. */
470 /* Print times taken by the various passes. -ftime-report. */
474 /* Print memory still in use at end of compilation (which may have little
475 to do with peak memory consumption). -fmem-report. */
479 /* Non-zero means to collect statistics which might be expensive
480 and to print them when we are done. */
481 int flag_detailed_statistics
= 0;
486 /* Nonzero means `char' should be signed. */
488 int flag_signed_char
;
490 /* Nonzero means give an enum type only as many bytes as it needs. */
492 int flag_short_enums
;
494 /* Nonzero for -fcaller-saves: allocate values in regs that need to
495 be saved across function calls, if that produces overall better code.
496 Optional now, so people can test it. */
498 #ifdef DEFAULT_CALLER_SAVES
499 int flag_caller_saves
= 1;
501 int flag_caller_saves
= 0;
504 /* Nonzero if structures and unions should be returned in memory.
506 This should only be defined if compatibility with another compiler or
507 with an ABI is needed, because it results in slower code. */
509 #ifndef DEFAULT_PCC_STRUCT_RETURN
510 #define DEFAULT_PCC_STRUCT_RETURN 1
513 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
515 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
517 /* Nonzero for -fforce-mem: load memory value into a register
518 before arithmetic on it. This makes better cse but slower compilation. */
520 int flag_force_mem
= 0;
522 /* Nonzero for -fforce-addr: load memory address into a register before
523 reference to memory. This makes better cse but slower compilation. */
525 int flag_force_addr
= 0;
527 /* Nonzero for -fdefer-pop: don't pop args after each function call;
528 instead save them up to pop many calls' args with one insns. */
530 int flag_defer_pop
= 0;
532 /* Nonzero for -ffloat-store: don't allocate floats and doubles
533 in extended-precision registers. */
535 int flag_float_store
= 0;
537 /* Nonzero for -fcse-follow-jumps:
538 have cse follow jumps to do a more extensive job. */
540 int flag_cse_follow_jumps
;
542 /* Nonzero for -fcse-skip-blocks:
543 have cse follow a branch around a block. */
544 int flag_cse_skip_blocks
;
546 /* Nonzero for -fexpensive-optimizations:
547 perform miscellaneous relatively-expensive optimizations. */
548 int flag_expensive_optimizations
;
550 /* Nonzero for -fthread-jumps:
551 have jump optimize output of loop. */
553 int flag_thread_jumps
;
555 /* Nonzero enables strength-reduction in loop.c. */
557 int flag_strength_reduce
= 0;
559 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
560 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
561 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
564 int flag_unroll_loops
;
566 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
567 This is generally not a win. */
569 int flag_unroll_all_loops
;
571 /* Nonzero forces all invariant computations in loops to be moved
574 int flag_move_all_movables
= 0;
576 /* Nonzero forces all general induction variables in loops to be
579 int flag_reduce_all_givs
= 0;
581 /* Nonzero to perform full register move optimization passes. This is the
584 int flag_regmove
= 0;
586 /* Nonzero for -fwritable-strings:
587 store string constants in data segment and don't uniquize them. */
589 int flag_writable_strings
= 0;
591 /* Nonzero means don't put addresses of constant functions in registers.
592 Used for compiling the Unix kernel, where strange substitutions are
593 done on the assembly output. */
595 int flag_no_function_cse
= 0;
597 /* Nonzero for -fomit-frame-pointer:
598 don't make a frame pointer in simple functions that don't require one. */
600 int flag_omit_frame_pointer
= 0;
602 /* Nonzero means place each function into its own section on those platforms
603 which support arbitrary section names and unlimited numbers of sections. */
605 int flag_function_sections
= 0;
607 /* ... and similar for data. */
609 int flag_data_sections
= 0;
611 /* Nonzero to inhibit use of define_optimization peephole opts. */
613 int flag_no_peephole
= 0;
615 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
617 int flag_optimize_sibling_calls
= 0;
619 /* Nonzero means the front end generally wants `errno' maintained by math
620 operations, like built-in SQRT. */
622 int flag_errno_math
= 1;
624 /* Nonzero means that unsafe floating-point math optimizations are allowed
625 for the sake of speed. IEEE compliance is not guaranteed, and operations
626 are allowed to assume that their arguments and results are "normal"
627 (e.g., nonnegative for SQRT). */
629 int flag_unsafe_math_optimizations
= 0;
631 /* Zero means that floating-point math operations cannot generate a
632 (user-visible) trap. This is the case, for example, in nonstop
633 IEEE 754 arithmetic. */
635 int flag_trapping_math
= 1;
637 /* 0 means straightforward implementation of complex divide acceptable.
638 1 means wide ranges of inputs must work for complex divide.
639 2 means C99-like requirements for complex divide (not yet implemented). */
641 int flag_complex_divide_method
= 0;
643 /* Nonzero means all references through pointers are volatile. */
647 /* Nonzero means treat all global and extern variables as volatile. */
649 int flag_volatile_global
;
651 /* Nonzero means treat all static variables as volatile. */
653 int flag_volatile_static
;
655 /* Nonzero means just do syntax checking; don't output anything. */
657 int flag_syntax_only
= 0;
659 /* Nonzero means perform global cse. */
661 static int flag_gcse
;
663 /* Nonzero means to use global dataflow analysis to eliminate
664 useless null pointer tests. */
666 static int flag_delete_null_pointer_checks
;
668 /* Nonzero means to do the enhanced load motion during gcse, which trys
669 to hoist loads by not killing them when a store to the same location
672 int flag_gcse_lm
= 1;
674 /* Nonzero means to perform store motion after gcse, which will try to
675 move stores closer to the exit block. Its not very effective without
678 int flag_gcse_sm
= 1;
680 /* Nonzero means to rerun cse after loop optimization. This increases
681 compilation time about 20% and picks up a few more common expressions. */
683 static int flag_rerun_cse_after_loop
;
685 /* Nonzero means to run loop optimizations twice. */
687 int flag_rerun_loop_opt
;
689 /* Nonzero for -finline-functions: ok to inline functions that look like
690 good inline candidates. */
692 int flag_inline_functions
;
694 /* Nonzero for -fkeep-inline-functions: even if we make a function
695 go inline everywhere, keep its definition around for debugging
698 int flag_keep_inline_functions
;
700 /* Nonzero means that functions will not be inlined. */
704 /* Nonzero means that we should emit static const variables
705 regardless of whether or not optimization is turned on. */
707 int flag_keep_static_consts
= 1;
709 /* Nonzero means we should be saving declaration info into a .X file. */
711 int flag_gen_aux_info
= 0;
713 /* Specified name of aux-info file. */
715 static char *aux_info_file_name
;
717 /* Nonzero means make the text shared if supported. */
719 int flag_shared_data
;
721 /* Nonzero means schedule into delayed branch slots if supported. */
723 int flag_delayed_branch
;
725 /* Nonzero if we are compiling pure (sharable) code.
726 Value is 1 if we are doing reasonable (i.e. simple
727 offset into offset table) pic. Value is 2 if we can
728 only perform register offsets. */
732 /* Nonzero means generate extra code for exception handling and enable
733 exception handling. */
737 /* Nonzero means generate frame unwind info table when supported. */
739 int flag_unwind_tables
= 0;
741 /* Nonzero means don't place uninitialized global data in common storage
746 /* Nonzero means pretend it is OK to examine bits of target floats,
747 even if that isn't true. The resulting code will have incorrect constants,
748 but the same series of instructions that the native compiler would make. */
750 int flag_pretend_float
;
752 /* Nonzero means change certain warnings into errors.
753 Usually these are warnings about failure to conform to some standard. */
755 int flag_pedantic_errors
= 0;
757 /* flag_schedule_insns means schedule insns within basic blocks (before
759 flag_schedule_insns_after_reload means schedule insns after
762 int flag_schedule_insns
= 0;
763 int flag_schedule_insns_after_reload
= 0;
765 /* The following flags have effect only for scheduling before register
768 flag_schedule_interblock means schedule insns accross basic blocks.
769 flag_schedule_speculative means allow speculative motion of non-load insns.
770 flag_schedule_speculative_load means allow speculative motion of some
772 flag_schedule_speculative_load_dangerous allows speculative motion of more
775 int flag_schedule_interblock
= 1;
776 int flag_schedule_speculative
= 1;
777 int flag_schedule_speculative_load
= 0;
778 int flag_schedule_speculative_load_dangerous
= 0;
780 int flag_single_precision_constant
;
782 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
783 by a cheaper branch on a count register. */
784 int flag_branch_on_count_reg
= 1;
786 /* -finhibit-size-directive inhibits output of .size for ELF.
787 This is used only for compiling crtstuff.c,
788 and it may be extended to other effects
789 needed for crtstuff.c on other systems. */
790 int flag_inhibit_size_directive
= 0;
792 /* -fverbose-asm causes extra commentary information to be produced in
793 the generated assembly code (to make it more readable). This option
794 is generally only of use to those who actually need to read the
795 generated assembly code (perhaps while debugging the compiler itself).
796 -fno-verbose-asm, the default, causes the extra information
797 to be omitted and is useful when comparing two assembler files. */
799 int flag_verbose_asm
= 0;
801 /* -dA causes debug commentary information to be produced in
802 the generated assembly code (to make it more readable). This option
803 is generally only of use to those who actually need to read the
804 generated assembly code (perhaps while debugging the compiler itself).
805 Currently, this switch is only used by dwarfout.c; however, it is intended
806 to be a catchall for printing debug information in the assembler file. */
808 int flag_debug_asm
= 0;
810 /* -dP causes the rtl to be emitted as a comment in assembly. */
812 int flag_dump_rtl_in_asm
= 0;
814 /* -fgnu-linker specifies use of the GNU linker for initializations.
815 (Or, more generally, a linker that handles initializations.)
816 -fno-gnu-linker says that collect2 will be used. */
818 int flag_gnu_linker
= 0;
820 int flag_gnu_linker
= 1;
826 /* Enable dead code elimination. */
829 /* Tag all structures with __attribute__(packed). */
830 int flag_pack_struct
= 0;
832 /* Emit code to check for stack overflow; also may cause large objects
833 to be allocated dynamically. */
834 int flag_stack_check
;
836 /* When non-NULL, indicates that whenever space is allocated on the
837 stack, the resulting stack pointer must not pass this
838 address---that is, for stacks that grow downward, the stack pointer
839 must always be greater than or equal to this address; for stacks
840 that grow upward, the stack pointer must be less than this address.
841 At present, the rtx may be either a REG or a SYMBOL_REF, although
842 the support provided depends on the backend. */
845 /* -fcheck-memory-usage causes extra code to be generated in order to check
846 memory accesses. This is used by a detector of bad memory accesses such
848 int flag_check_memory_usage
= 0;
850 /* -fprefix-function-name causes function name to be prefixed. This
851 can be used with -fcheck-memory-usage to isolate code compiled with
852 -fcheck-memory-usage. */
853 int flag_prefix_function_name
= 0;
855 /* 0 if pointer arguments may alias each other. True in C.
856 1 if pointer arguments may not alias each other but may alias
858 2 if pointer arguments may not alias each other and may not
859 alias global variables. True in Fortran.
860 This defaults to 0 for C. */
861 int flag_argument_noalias
= 0;
863 /* Nonzero if we should do (language-dependent) alias analysis.
864 Typically, this analysis will assume that expressions of certain
865 types do not alias expressions of certain other types. Only used
866 if alias analysis (in general) is enabled. */
867 int flag_strict_aliasing
= 0;
869 /* Instrument functions with calls at entry and exit, for profiling. */
870 int flag_instrument_function_entry_exit
= 0;
872 /* Nonzero means ignore `#ident' directives. 0 means handle them.
873 On SVR4 targets, it also controls whether or not to emit a
874 string identifying the compiler. */
876 int flag_no_ident
= 0;
878 /* This will perform a peephole pass before sched2. */
879 int flag_peephole2
= 0;
881 /* This will try to guess branch probabilities. */
882 int flag_guess_branch_prob
= 0;
884 /* -fbounded-pointers causes gcc to compile pointers as composite
885 objects occupying three words: the pointer value, the base address
886 of the referent object, and the address immediately beyond the end
887 of the referent object. The base and extent allow us to perform
888 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
889 int flag_bounded_pointers
= 0;
891 /* -fcheck-bounds causes gcc to generate array bounds checks.
892 For C, C++: defaults to value of flag_bounded_pointers.
893 For ObjC: defaults to off.
894 For Java: defaults to on.
895 For Fortran: defaults to off.
896 For CHILL: defaults to off. */
897 int flag_bounds_check
= 0;
899 /* If one, renumber instruction UIDs to reduce the number of
900 unused UIDs if there are a lot of instructions. If greater than
901 one, unconditionally renumber instruction UIDs. */
902 int flag_renumber_insns
= 1;
904 /* Values of the -falign-* flags: how much to align labels in code.
905 0 means `use default', 1 means `don't align'.
906 For each variable, there is an _log variant which is the power
907 of two not less than the variable, for .align output. */
914 int align_labels_log
;
916 int align_functions_log
;
918 /* Table of supported debugging formats. */
922 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
923 constant expression, we use NO_DEBUG in its place. */
924 enum debug_info_type debug_type
;
925 int use_extensions_p
;
926 const char *description
;
930 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
931 N_("Generate debugging info in default format") },
932 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
933 #ifdef DBX_DEBUGGING_INFO
934 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
935 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
937 #ifdef DWARF_DEBUGGING_INFO
938 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
939 { "dwarf+", DWARF_DEBUG
, 1,
940 N_("Generate extended DWARF-1 format debug info") },
942 #ifdef DWARF2_DEBUGGING_INFO
943 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
945 #ifdef XCOFF_DEBUGGING_INFO
946 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
947 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
949 #ifdef SDB_DEBUGGING_INFO
950 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
960 const char *description
;
962 lang_independent_options
;
966 /* Add or remove a leading underscore from user symbols. */
967 int flag_leading_underscore
= -1;
969 /* The user symbol prefix after having resolved same. */
970 const char *user_label_prefix
;
972 static const param_info lang_independent_params
[] = {
973 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
974 { OPTION, DEFAULT, HELP },
975 #include "params.def"
980 /* A default for same. */
981 #ifndef USER_LABEL_PREFIX
982 #define USER_LABEL_PREFIX ""
985 /* Table of language-independent -f options.
986 STRING is the option name. VARIABLE is the address of the variable.
987 ON_VALUE is the value to store in VARIABLE
988 if `-fSTRING' is seen as an option.
989 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
991 lang_independent_options f_options
[] =
993 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
994 N_("Perform DWARF2 duplicate elimination") },
995 {"float-store", &flag_float_store
, 1,
996 N_("Do not store floats in registers") },
997 {"volatile", &flag_volatile
, 1,
998 N_("Consider all mem refs through pointers as volatile") },
999 {"volatile-global", &flag_volatile_global
, 1,
1000 N_("Consider all mem refs to global data to be volatile") },
1001 {"volatile-static", &flag_volatile_static
, 1,
1002 N_("Consider all mem refs to static data to be volatile") },
1003 {"defer-pop", &flag_defer_pop
, 1,
1004 N_("Defer popping functions args from stack until later") },
1005 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1006 N_("When possible do not generate stack frames") },
1007 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1008 N_("Optimize sibling and tail recursive calls") },
1009 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1010 N_("When running CSE, follow jumps to their targets") },
1011 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1012 N_("When running CSE, follow conditional jumps") },
1013 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1014 N_("Perform a number of minor, expensive optimisations") },
1015 {"thread-jumps", &flag_thread_jumps
, 1,
1016 N_("Perform jump threading optimisations") },
1017 {"strength-reduce", &flag_strength_reduce
, 1,
1018 N_("Perform strength reduction optimisations") },
1019 {"unroll-loops", &flag_unroll_loops
, 1,
1020 N_("Perform loop unrolling when iteration count is known") },
1021 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1022 N_("Perform loop unrolling for all loops") },
1023 {"move-all-movables", &flag_move_all_movables
, 1,
1024 N_("Force all loop invariant computations out of loops") },
1025 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1026 N_("Strength reduce all loop general induction variables") },
1027 {"writable-strings", &flag_writable_strings
, 1,
1028 N_("Store strings in writable data section") },
1029 {"peephole", &flag_no_peephole
, 0,
1030 N_("Enable machine specific peephole optimisations") },
1031 {"force-mem", &flag_force_mem
, 1,
1032 N_("Copy memory operands into registers before using") },
1033 {"force-addr", &flag_force_addr
, 1,
1034 N_("Copy memory address constants into regs before using") },
1035 {"function-cse", &flag_no_function_cse
, 0,
1036 N_("Allow function addresses to be held in registers") },
1037 {"inline-functions", &flag_inline_functions
, 1,
1038 N_("Integrate simple functions into their callers") },
1039 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1040 N_("Generate code for funcs even if they are fully inlined") },
1041 {"inline", &flag_no_inline
, 0,
1042 N_("Pay attention to the 'inline' keyword") },
1043 {"keep-static-consts", &flag_keep_static_consts
, 1,
1044 N_("Emit static const variables even if they are not used") },
1045 {"syntax-only", &flag_syntax_only
, 1,
1046 N_("Check for syntax errors, then stop") },
1047 {"shared-data", &flag_shared_data
, 1,
1048 N_("Mark data as shared rather than private") },
1049 {"caller-saves", &flag_caller_saves
, 1,
1050 N_("Enable saving registers around function calls") },
1051 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1052 N_("Return 'short' aggregates in memory, not registers") },
1053 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1054 N_("Return 'short' aggregates in registers") },
1055 {"delayed-branch", &flag_delayed_branch
, 1,
1056 N_("Attempt to fill delay slots of branch instructions") },
1057 {"gcse", &flag_gcse
, 1,
1058 N_("Perform the global common subexpression elimination") },
1059 {"gcse-lm", &flag_gcse_lm
, 1,
1060 N_("Perform enhanced load motion during global subexpression elimination") },
1061 {"gcse-sm", &flag_gcse_sm
, 1,
1062 N_("Perform store motion after global subexpression elimination") },
1063 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1064 N_("Run CSE pass after loop optimisations") },
1065 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1066 N_("Run the loop optimiser twice") },
1067 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1068 N_("Delete useless null pointer checks") },
1069 {"pretend-float", &flag_pretend_float
, 1,
1070 N_("Pretend that host and target use the same FP format") },
1071 {"schedule-insns", &flag_schedule_insns
, 1,
1072 N_("Reschedule instructions before register allocation") },
1073 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1074 N_("Reschedule instructions after register allocation") },
1075 {"sched-interblock",&flag_schedule_interblock
, 1,
1076 N_("Enable scheduling across basic blocks") },
1077 {"sched-spec",&flag_schedule_speculative
, 1,
1078 N_("Allow speculative motion of non-loads") },
1079 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1080 N_("Allow speculative motion of some loads") },
1081 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1082 N_("Allow speculative motion of more loads") },
1083 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1084 N_("Replace add,compare,branch with branch on count reg") },
1085 {"pic", &flag_pic
, 1,
1086 N_("Generate position independent code, if possible") },
1087 {"PIC", &flag_pic
, 2, ""},
1088 {"exceptions", &flag_exceptions
, 1,
1089 N_("Enable exception handling") },
1090 {"unwind-tables", &flag_unwind_tables
, 1,
1091 N_("Just generate unwind tables for exception handling") },
1092 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1093 N_("Support synchronous non-call exceptions") },
1094 {"profile-arcs", &profile_arc_flag
, 1,
1095 N_("Insert arc based program profiling code") },
1096 {"test-coverage", &flag_test_coverage
, 1,
1097 N_("Create data files needed by gcov") },
1098 {"branch-probabilities", &flag_branch_probabilities
, 1,
1099 N_("Use profiling information for branch probabilities") },
1100 {"reorder-blocks", &flag_reorder_blocks
, 1,
1101 N_("Reorder basic blocks to improve code placement") },
1102 {"rename-registers", &flag_rename_registers
, 1,
1103 N_("Do the register renaming optimization pass") },
1104 {"common", &flag_no_common
, 0,
1105 N_("Do not put unitialised globals in the common section") },
1106 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1107 N_("Do not generate .size directives") },
1108 {"function-sections", &flag_function_sections
, 1,
1109 N_("place each function into its own section") },
1110 {"data-sections", &flag_data_sections
, 1,
1111 N_("place data items into their own section") },
1112 {"verbose-asm", &flag_verbose_asm
, 1,
1113 N_("Add extra commentry to assembler output") },
1114 {"gnu-linker", &flag_gnu_linker
, 1,
1115 N_("Output GNU ld formatted global initialisers") },
1116 {"regmove", &flag_regmove
, 1,
1117 N_("Enables a register move optimisation") },
1118 {"optimize-register-move", &flag_regmove
, 1,
1119 N_("Do the full regmove optimization pass") },
1120 {"pack-struct", &flag_pack_struct
, 1,
1121 N_("Pack structure members together without holes") },
1122 {"stack-check", &flag_stack_check
, 1,
1123 N_("Insert stack checking code into the program") },
1124 {"argument-alias", &flag_argument_noalias
, 0,
1125 N_("Specify that arguments may alias each other & globals") },
1126 {"argument-noalias", &flag_argument_noalias
, 1,
1127 N_("Assume arguments may alias globals but not each other") },
1128 {"argument-noalias-global", &flag_argument_noalias
, 2,
1129 N_("Assume arguments do not alias each other or globals") },
1130 {"strict-aliasing", &flag_strict_aliasing
, 1,
1131 N_("Assume strict aliasing rules apply") },
1132 {"align-loops", &align_loops
, 0,
1133 N_("Align the start of loops") },
1134 {"align-jumps", &align_jumps
, 0,
1135 N_("Align labels which are only reached by jumping") },
1136 {"align-labels", &align_labels
, 0,
1137 N_("Align all labels") },
1138 {"align-functions", &align_functions
, 0,
1139 N_("Align the start of functions") },
1140 {"check-memory-usage", &flag_check_memory_usage
, 1,
1141 N_("Generate code to check every memory access") },
1142 {"prefix-function-name", &flag_prefix_function_name
, 1,
1143 N_("Add a prefix to all function names") },
1144 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1145 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1146 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1147 N_("Instrument function entry/exit with profiling calls") },
1148 {"ssa", &flag_ssa
, 1,
1149 N_("Enable SSA optimizations") },
1150 {"dce", &flag_dce
, 1,
1151 N_("Enable dead code elimination") },
1152 {"leading-underscore", &flag_leading_underscore
, 1,
1153 N_("External symbols have a leading underscore") },
1154 {"ident", &flag_no_ident
, 0,
1155 N_("Process #ident directives") },
1156 { "peephole2", &flag_peephole2
, 1,
1157 N_("Enables an rtl peephole pass run before sched2") },
1158 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1159 N_("Enables guessing of branch probabilities") },
1160 {"math-errno", &flag_errno_math
, 1,
1161 N_("Set errno after built-in math functions") },
1162 {"trapping-math", &flag_trapping_math
, 1,
1163 N_("Floating-point operations can trap") },
1164 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1165 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1166 {"bounded-pointers", &flag_bounded_pointers
, 1,
1167 N_("Compile pointers as triples: value, base & end") },
1168 {"bounds-check", &flag_bounds_check
, 1,
1169 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1170 {"single-precision-constant", &flag_single_precision_constant
, 1,
1171 N_("Convert floating point constant to single precision constant") },
1172 {"time-report", &time_report
, 1,
1173 N_("Report time taken by each compiler pass at end of run") },
1174 {"mem-report", &mem_report
, 1,
1175 N_("Report on permanent memory allocation at end of run") },
1176 { "trapv", &flag_trapv
, 1,
1177 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1180 /* Table of language-specific options. */
1182 static struct lang_opt
1185 const char *description
;
1187 documented_lang_options
[] =
1189 /* In order not to overload the --help output, the convention
1190 used here is to only describe those options which are not
1191 enabled by default. */
1194 N_("Compile just for ISO C89") },
1195 { "-fallow-single-precision",
1196 N_("Do not promote floats to double if using -traditional") },
1198 N_("Determine language standard") },
1200 { "-fsigned-bitfields", "" },
1201 { "-funsigned-bitfields",
1202 N_("Make bitfields by unsigned by default") },
1203 { "-fno-signed-bitfields", "" },
1204 { "-fno-unsigned-bitfields","" },
1206 N_("Make 'char' be signed by default") },
1207 { "-funsigned-char",
1208 N_("Make 'char' be unsigned by default") },
1209 { "-fno-signed-char", "" },
1210 { "-fno-unsigned-char", "" },
1212 { "-ftraditional", "" },
1214 N_("Attempt to support traditional K&R style C") },
1215 { "-fnotraditional", "" },
1216 { "-fno-traditional", "" },
1220 N_("Do not recognise the 'asm' keyword") },
1221 { "-fbuiltin", "" },
1223 N_("Do not recognise any built in functions") },
1225 N_("Assume normal C execution environment") },
1226 { "-fno-hosted", "" },
1228 N_("Assume that standard libraries & main might not exist") },
1229 { "-fno-freestanding", "" },
1230 { "-fcond-mismatch",
1231 N_("Allow different types as args of ? operator") },
1232 { "-fno-cond-mismatch", "" },
1233 { "-fdollars-in-identifiers",
1234 N_("Allow the use of $ inside identifiers") },
1235 { "-fno-dollars-in-identifiers", "" },
1236 { "-fpreprocessed", "" },
1237 { "-fno-preprocessed", "" },
1239 N_("Use the same size for double as for float") },
1240 { "-fno-short-double", "" },
1242 N_("Use the smallest fitting integer to hold enums") },
1243 { "-fno-short-enums", "" },
1245 N_("Override the underlying type for wchar_t to `unsigned short'") },
1246 { "-fno-short-wchar", "" },
1249 N_("Enable most warning messages") },
1250 { "-Wbad-function-cast",
1251 N_("Warn about casting functions to incompatible types") },
1252 { "-Wno-bad-function-cast", "" },
1253 { "-Wno-missing-noreturn", "" },
1254 { "-Wmissing-format-attribute",
1255 N_("Warn about functions which might be candidates for format attributes") },
1256 { "-Wno-missing-format-attribute", "" },
1258 N_("Warn about casts which discard qualifiers") },
1259 { "-Wno-cast-qual", "" },
1260 { "-Wchar-subscripts",
1261 N_("Warn about subscripts whose type is 'char'") },
1262 { "-Wno-char-subscripts", "" },
1264 N_("Warn if nested comments are detected") },
1265 { "-Wno-comment", "" },
1267 N_("Warn if nested comments are detected") },
1268 { "-Wno-comments", "" },
1270 N_("Warn about possibly confusing type conversions") },
1271 { "-Wno-conversion", "" },
1273 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1274 { "-Wno-format", "" },
1275 { "-Wformat-y2k", "" },
1276 { "-Wno-format-y2k",
1277 N_("Don't warn about strftime formats yielding 2 digit years") },
1278 { "-Wformat-extra-args", "" },
1279 { "-Wno-format-extra-args",
1280 N_("Don't warn about too many arguments to format functions") },
1281 { "-Wformat-nonliteral",
1282 N_("Warn about non-string-literal format strings") },
1283 { "-Wno-format-nonliteral", "" },
1284 { "-Wformat-security",
1285 N_("Warn about possible security problems with format functions") },
1286 { "-Wno-format-security", "" },
1287 { "-Wimplicit-function-declaration",
1288 N_("Warn about implicit function declarations") },
1289 { "-Wno-implicit-function-declaration", "" },
1290 { "-Werror-implicit-function-declaration", "" },
1292 N_("Warn when a declaration does not specify a type") },
1293 { "-Wno-implicit-int", "" },
1294 { "-Wimplicit", "" },
1295 { "-Wno-implicit", "" },
1297 N_("Warn about the use of the #import directive") },
1298 { "-Wno-import", "" },
1299 { "-Wlong-long","" },
1301 N_("Do not warn about using 'long long' when -pedantic") },
1303 N_("Warn about suspicious declarations of main") },
1304 { "-Wno-main", "" },
1305 { "-Wmissing-braces",
1306 N_("Warn about possibly missing braces around initialisers") },
1307 { "-Wno-missing-braces", "" },
1308 { "-Wmissing-declarations",
1309 N_("Warn about global funcs without previous declarations") },
1310 { "-Wno-missing-declarations", "" },
1311 { "-Wmissing-prototypes",
1312 N_("Warn about global funcs without prototypes") },
1313 { "-Wno-missing-prototypes", "" },
1315 N_("Warn about use of multicharacter literals") },
1316 { "-Wno-multichar", "" },
1317 { "-Wnested-externs",
1318 N_("Warn about externs not at file scope level") },
1319 { "-Wno-nested-externs", "" },
1321 N_("Warn about possible missing parentheses") },
1322 { "-Wno-parentheses", "" },
1323 { "-Wsequence-point",
1324 N_("Warn about possible violations of sequence point rules") },
1325 { "-Wno-sequence-point", "" },
1326 { "-Wpointer-arith",
1327 N_("Warn about function pointer arithmetic") },
1328 { "-Wno-pointer-arith", "" },
1329 { "-Wredundant-decls",
1330 N_("Warn about multiple declarations of the same object") },
1331 { "-Wno-redundant-decls", "" },
1333 N_("Warn about signed/unsigned comparisons") },
1334 { "-Wno-sign-compare", "" },
1336 N_("Warn about testing equality of floating point numbers") },
1337 { "-Wno-float-equal", "" },
1338 { "-Wunknown-pragmas",
1339 N_("Warn about unrecognized pragmas") },
1340 { "-Wno-unknown-pragmas", "" },
1341 { "-Wstrict-prototypes",
1342 N_("Warn about non-prototyped function decls") },
1343 { "-Wno-strict-prototypes", "" },
1345 N_("Warn about constructs whose meaning change in ISO C") },
1346 { "-Wno-traditional", "" },
1348 N_("Warn when trigraphs are encountered") },
1349 { "-Wno-trigraphs", "" },
1351 { "-Wno-undef", "" },
1352 { "-Wwrite-strings",
1353 N_("Mark strings as 'const char *'") },
1354 { "-Wno-write-strings", "" },
1356 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1358 #include "options.h"
1362 /* Here is a table, controlled by the tm.h file, listing each -m switch
1363 and which bits in `target_switches' it should set or clear.
1364 If VALUE is positive, it is bits to set.
1365 If VALUE is negative, -VALUE is bits to clear.
1366 (The sign bit is not used so there is no confusion.) */
1372 const char *description
;
1374 target_switches
[] = TARGET_SWITCHES
;
1376 /* This table is similar, but allows the switch to have a value. */
1378 #ifdef TARGET_OPTIONS
1382 const char **variable
;
1383 const char *description
;
1385 target_options
[] = TARGET_OPTIONS
;
1388 /* Options controlling warnings. */
1390 /* Don't print warning messages. -w. */
1392 int inhibit_warnings
= 0;
1394 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1396 int warn_system_headers
= 0;
1398 /* Print various extra warnings. -W. */
1400 int extra_warnings
= 0;
1402 /* Treat warnings as errors. -Werror. */
1404 int warnings_are_errors
= 0;
1406 /* Nonzero to warn about unused variables, functions et.al. */
1408 int warn_unused_function
;
1409 int warn_unused_label
;
1410 int warn_unused_parameter
;
1411 int warn_unused_variable
;
1412 int warn_unused_value
;
1415 set_Wunused (setting
)
1418 warn_unused_function
= setting
;
1419 warn_unused_label
= setting
;
1420 /* Unused function parameter warnings are reported when either ``-W
1421 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1422 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1424 warn_unused_parameter
= 0;
1425 else if (!warn_unused_parameter
)
1426 warn_unused_parameter
= -1;
1427 warn_unused_variable
= setting
;
1428 warn_unused_value
= setting
;
1431 /* Nonzero to warn about code which is never reached. */
1433 int warn_notreached
;
1435 /* Nonzero to warn about variables used before they are initialized. */
1437 int warn_uninitialized
;
1439 /* Nonzero means warn about all declarations which shadow others. */
1443 /* Warn if a switch on an enum fails to have a case for every enum value. */
1447 /* Nonzero means warn about function definitions that default the return type
1448 or that use a null return and have a return-type other than void. */
1450 int warn_return_type
;
1452 /* Nonzero means warn about pointer casts that increase the required
1453 alignment of the target type (and might therefore lead to a crash
1454 due to a misaligned access). */
1456 int warn_cast_align
;
1458 /* Nonzero means warn about any objects definitions whose size is larger
1459 than N bytes. Also want about function definitions whose returned
1460 values are larger than N bytes. The value N is in `larger_than_size'. */
1462 int warn_larger_than
;
1463 HOST_WIDE_INT larger_than_size
;
1465 /* Nonzero means warn if inline function is too large. */
1469 /* Warn if a function returns an aggregate,
1470 since there are often incompatible calling conventions for doing this. */
1472 int warn_aggregate_return
;
1474 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1478 /* Warn when gcc pads a structure to an alignment boundary. */
1482 /* Warn when an optimization pass is disabled. */
1484 int warn_disabled_optimization
;
1486 /* Warn about functions which might be candidates for attribute noreturn. */
1488 int warn_missing_noreturn
;
1490 /* Likewise for -W. */
1492 lang_independent_options W_options
[] =
1494 {"unused-function", &warn_unused_function
, 1,
1495 N_("Warn when a function is unused") },
1496 {"unused-label", &warn_unused_label
, 1,
1497 N_("Warn when a label is unused") },
1498 {"unused-parameter", &warn_unused_parameter
, 1,
1499 N_("Warn when a function parameter is unused") },
1500 {"unused-variable", &warn_unused_variable
, 1,
1501 N_("Warn when a variable is unused") },
1502 {"unused-value", &warn_unused_value
, 1,
1503 N_("Warn when an expression value is unused") },
1504 {"system-headers", &warn_system_headers
, 1,
1505 N_("Do not suppress warnings from system headers") },
1506 {"error", &warnings_are_errors
, 1,
1507 N_("Treat all warnings as errors") },
1508 {"shadow", &warn_shadow
, 1,
1509 N_("Warn when one local variable shadows another") },
1510 {"switch", &warn_switch
, 1,
1511 N_("Warn about enumerated switches missing a specific case") },
1512 {"aggregate-return", &warn_aggregate_return
, 1,
1513 N_("Warn about returning structures, unions or arrays") },
1514 {"cast-align", &warn_cast_align
, 1,
1515 N_("Warn about pointer casts which increase alignment") },
1516 {"unreachable-code", &warn_notreached
, 1,
1517 N_("Warn about code that will never be executed") },
1518 {"uninitialized", &warn_uninitialized
, 1,
1519 N_("Warn about unitialized automatic variables") },
1520 {"inline", &warn_inline
, 1,
1521 N_("Warn when an inlined function cannot be inlined") },
1522 {"packed", &warn_packed
, 1,
1523 N_("Warn when the packed attribute has no effect on struct layout") },
1524 {"padded", &warn_padded
, 1,
1525 N_("Warn when padding is required to align struct members") },
1526 {"disabled-optimization", &warn_disabled_optimization
, 1,
1527 N_("Warn when an optimization pass is disabled") },
1528 {"missing-noreturn", &warn_missing_noreturn
, 1,
1529 N_("Warn about functions which might be candidates for attribute noreturn") }
1532 /* The following routines are useful in setting all the flags that
1533 -ffast-math and -fno-fast-math imply. */
1536 set_fast_math_flags ()
1538 flag_trapping_math
= 0;
1539 flag_unsafe_math_optimizations
= 1;
1540 flag_errno_math
= 0;
1544 set_no_fast_math_flags ()
1546 flag_trapping_math
= 1;
1547 flag_unsafe_math_optimizations
= 0;
1548 flag_errno_math
= 1;
1552 /* Output files for assembler code (real compiler output)
1553 and debugging dumps. */
1556 FILE *aux_info_file
;
1557 FILE *rtl_dump_file
= NULL
;
1559 /* Decode the string P as an integral parameter.
1560 If the string is indeed an integer return its numeric value else
1561 issue an Invalid Option error for the option PNAME and return DEFVAL.
1562 If PNAME is zero just return DEFVAL, do not call error. */
1565 read_integral_parameter (p
, pname
, defval
)
1570 const char *endp
= p
;
1574 if (*endp
>= '0' && *endp
<= '9')
1583 error ("Invalid option `%s'", pname
);
1591 /* This is the default decl_printable_name function. */
1594 decl_name (decl
, verbosity
)
1596 int verbosity ATTRIBUTE_UNUSED
;
1598 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1602 /* This calls abort and is used to avoid problems when abort if a macro.
1603 It is used when we need to pass the address of abort. */
1611 /* When `malloc.c' is compiled with `rcheck' defined,
1612 it calls this function to report clobberage. */
1616 const char *s ATTRIBUTE_UNUSED
;
1621 /* Return the logarithm of X, base 2, considering X unsigned,
1622 if X is a power of 2. Otherwise, returns -1.
1624 This should be used via the `exact_log2' macro. */
1628 register unsigned HOST_WIDE_INT x
;
1630 register int log
= 0;
1631 /* Test for 0 or a power of 2. */
1632 if (x
== 0 || x
!= (x
& -x
))
1634 while ((x
>>= 1) != 0)
1639 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1640 If X is 0, return -1.
1642 This should be used via the floor_log2 macro. */
1646 register unsigned HOST_WIDE_INT x
;
1648 register int log
= -1;
1655 static int float_handler_set
;
1657 jmp_buf float_handler
;
1659 /* Signals actually come here. */
1662 float_signal (signo
)
1663 /* If this is missing, some compilers complain. */
1664 int signo ATTRIBUTE_UNUSED
;
1666 if (float_handled
== 0)
1667 crash_signal (signo
);
1670 /* On System-V derived systems, we must reinstall the signal handler.
1671 This is harmless on BSD-derived systems. */
1672 signal (SIGFPE
, float_signal
);
1673 longjmp (float_handler
, 1);
1676 /* Specify where to longjmp to when a floating arithmetic error happens.
1677 If HANDLER is 0, it means don't handle the errors any more. */
1680 set_float_handler (handler
)
1683 float_handled
= (handler
!= 0);
1685 memcpy (float_handler
, handler
, sizeof (float_handler
));
1687 if (float_handled
&& ! float_handler_set
)
1689 signal (SIGFPE
, float_signal
);
1690 float_handler_set
= 1;
1694 /* This is a wrapper function for code which might elicit an
1695 arithmetic exception. That code should be passed in as a function
1696 pointer FN, and one argument DATA. DATA is usually a struct which
1697 contains the real input and output for function FN. This function
1698 returns 0 (failure) if longjmp was called (i.e. an exception
1699 occured.) It returns 1 (success) otherwise. */
1702 do_float_handler (fn
, data
)
1703 void (*fn
) PARAMS ((PTR
));
1710 /* We got here via longjmp () caused by an exception in function
1712 set_float_handler (NULL
);
1716 set_float_handler (buf
);
1718 set_float_handler (NULL
);
1722 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1723 into ICE messages, which is much more user friendly. */
1726 crash_signal (signo
)
1729 internal_error ("Internal error: %s", strsignal (signo
));
1732 /* Strip off a legitimate source ending from the input string NAME of
1733 length LEN. Rather than having to know the names used by all of
1734 our front ends, we strip off an ending of a period followed by
1735 up to five characters. (Java uses ".class".) */
1738 strip_off_ending (name
, len
)
1743 for (i
= 2; i
< 6 && len
> i
; i
++)
1745 if (name
[len
- i
] == '.')
1747 name
[len
- i
] = '\0';
1753 /* Output a quoted string. */
1756 output_quoted_string (asm_file
, string
)
1760 #ifdef OUTPUT_QUOTED_STRING
1761 OUTPUT_QUOTED_STRING (asm_file
, string
);
1765 putc ('\"', asm_file
);
1766 while ((c
= *string
++) != 0)
1768 if (c
== '\"' || c
== '\\')
1769 putc ('\\', asm_file
);
1772 putc ('\"', asm_file
);
1776 /* Output a file name in the form wanted by System V. */
1779 output_file_directive (asm_file
, input_name
)
1781 const char *input_name
;
1783 int len
= strlen (input_name
);
1784 const char *na
= input_name
+ len
;
1786 /* NA gets INPUT_NAME sans directory names. */
1787 while (na
> input_name
)
1789 if (IS_DIR_SEPARATOR (na
[-1]))
1794 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1795 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1797 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1798 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1800 fprintf (asm_file
, "\t.file\t");
1801 output_quoted_string (asm_file
, na
);
1802 fputc ('\n', asm_file
);
1807 /* Routine to open a dump file. Return true if the dump file is enabled. */
1810 open_dump_file (index
, decl
)
1811 enum dump_file_index index
;
1815 const char *open_arg
;
1818 if (! dump_file
[index
].enabled
)
1821 timevar_push (TV_DUMP
);
1822 if (rtl_dump_file
!= NULL
)
1823 fclose (rtl_dump_file
);
1825 sprintf (seq
, ".%02d.", index
);
1827 if (! dump_file
[index
].initialized
)
1829 /* If we've not initialized the files, do so now. */
1830 if (graph_dump_format
!= no_graph
1831 && dump_file
[index
].graph_dump_p
)
1833 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1834 clean_graph_dump_file (dump_base_name
, dump_name
);
1837 dump_file
[index
].initialized
= 1;
1843 dump_name
= concat (dump_base_name
, seq
,
1844 dump_file
[index
].extension
, NULL
);
1846 rtl_dump_file
= fopen (dump_name
, open_arg
);
1847 if (rtl_dump_file
== NULL
)
1848 fatal_io_error ("can't open %s", dump_name
);
1853 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1854 decl_printable_name (decl
, 2));
1856 timevar_pop (TV_DUMP
);
1860 /* Routine to close a dump file. */
1863 close_dump_file (index
, func
, insns
)
1864 enum dump_file_index index
;
1865 void (*func
) PARAMS ((FILE *, rtx
));
1868 if (! rtl_dump_file
)
1871 timevar_push (TV_DUMP
);
1873 && graph_dump_format
!= no_graph
1874 && dump_file
[index
].graph_dump_p
)
1879 sprintf (seq
, ".%02d.", index
);
1880 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1881 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1886 func (rtl_dump_file
, insns
);
1888 fflush (rtl_dump_file
);
1889 fclose (rtl_dump_file
);
1891 rtl_dump_file
= NULL
;
1892 timevar_pop (TV_DUMP
);
1895 /* Do any final processing required for the declarations in VEC, of
1896 which there are LEN. We write out inline functions and variables
1897 that have been deferred until this point, but which are required.
1898 Returns non-zero if anything was put out. */
1901 wrapup_global_declarations (vec
, len
)
1908 int output_something
= 0;
1910 for (i
= 0; i
< len
; i
++)
1914 /* We're not deferring this any longer. */
1915 DECL_DEFER_OUTPUT (decl
) = 0;
1917 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1918 && incomplete_decl_finalize_hook
!= 0)
1919 (*incomplete_decl_finalize_hook
) (decl
);
1922 /* Now emit any global variables or functions that we have been
1923 putting off. We need to loop in case one of the things emitted
1924 here references another one which comes earlier in the list. */
1928 for (i
= 0; i
< len
; i
++)
1932 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1935 /* Don't write out static consts, unless we still need them.
1937 We also keep static consts if not optimizing (for debugging),
1938 unless the user specified -fno-keep-static-consts.
1939 ??? They might be better written into the debug information.
1940 This is possible when using DWARF.
1942 A language processor that wants static constants to be always
1943 written out (even if it is not used) is responsible for
1944 calling rest_of_decl_compilation itself. E.g. the C front-end
1945 calls rest_of_decl_compilation from finish_decl.
1946 One motivation for this is that is conventional in some
1947 environments to write things like:
1948 static const char rcsid[] = "... version string ...";
1949 intending to force the string to be in the executable.
1951 A language processor that would prefer to have unneeded
1952 static constants "optimized away" would just defer writing
1953 them out until here. E.g. C++ does this, because static
1954 constants are often defined in header files.
1956 ??? A tempting alternative (for both C and C++) would be
1957 to force a constant to be written if and only if it is
1958 defined in a main file, as opposed to an include file. */
1960 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1961 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1962 && !DECL_COMDAT (decl
))
1964 && flag_keep_static_consts
1965 && !DECL_ARTIFICIAL (decl
))
1966 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1969 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1972 if (TREE_CODE (decl
) == FUNCTION_DECL
1973 && DECL_INITIAL (decl
) != 0
1974 && DECL_SAVED_INSNS (decl
) != 0
1975 && (flag_keep_inline_functions
1976 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1977 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1980 output_inline_function (decl
);
1985 output_something
= 1;
1989 return output_something
;
1992 /* Issue appropriate warnings for the global declarations in VEC (of
1993 which there are LEN). Output debugging information for them. */
1996 check_global_declarations (vec
, len
)
2003 for (i
= 0; i
< len
; i
++)
2007 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2008 && ! TREE_ASM_WRITTEN (decl
))
2009 /* Cancel the RTL for this decl so that, if debugging info
2010 output for global variables is still to come,
2011 this one will be omitted. */
2012 SET_DECL_RTL (decl
, NULL_RTX
);
2014 /* Warn about any function
2015 declared static but not defined.
2016 We don't warn about variables,
2017 because many programs have static variables
2018 that exist only to get some text into the object file. */
2019 if (TREE_CODE (decl
) == FUNCTION_DECL
2020 && (warn_unused_function
2021 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2022 && DECL_INITIAL (decl
) == 0
2023 && DECL_EXTERNAL (decl
)
2024 && ! DECL_ARTIFICIAL (decl
)
2025 && ! TREE_PUBLIC (decl
))
2027 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2028 pedwarn_with_decl (decl
,
2029 "`%s' used but never defined");
2031 warning_with_decl (decl
,
2032 "`%s' declared `static' but never defined");
2033 /* This symbol is effectively an "extern" declaration now. */
2034 TREE_PUBLIC (decl
) = 1;
2035 assemble_external (decl
);
2038 /* Warn about static fns or vars defined but not used,
2039 but not about inline functions or static consts
2040 since defining those in header files is normal practice. */
2041 if (((warn_unused_function
2042 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2043 || (warn_unused_variable
2044 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2045 && ! DECL_IN_SYSTEM_HEADER (decl
)
2046 && ! DECL_EXTERNAL (decl
)
2047 && ! TREE_PUBLIC (decl
)
2048 && ! TREE_USED (decl
)
2049 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2050 /* The TREE_USED bit for file-scope decls
2051 is kept in the identifier, to handle multiple
2052 external decls in different scopes. */
2053 && ! TREE_USED (DECL_NAME (decl
)))
2054 warning_with_decl (decl
, "`%s' defined but not used");
2056 timevar_push (TV_SYMOUT
);
2057 #ifdef SDB_DEBUGGING_INFO
2058 /* The COFF linker can move initialized global vars to the end.
2059 And that can screw up the symbol ordering.
2060 By putting the symbols in that order to begin with,
2061 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2062 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2063 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2064 && ! DECL_EXTERNAL (decl
)
2065 && DECL_RTL (decl
) != 0)
2066 sdbout_symbol (decl
, 0);
2068 /* Output COFF information for non-global
2069 file-scope initialized variables. */
2070 if (write_symbols
== SDB_DEBUG
2071 && TREE_CODE (decl
) == VAR_DECL
2072 && DECL_INITIAL (decl
)
2073 && ! DECL_EXTERNAL (decl
)
2074 && DECL_RTL (decl
) != 0
2075 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2076 sdbout_toplevel_data (decl
);
2077 #endif /* SDB_DEBUGGING_INFO */
2078 #ifdef DWARF_DEBUGGING_INFO
2079 /* Output DWARF information for file-scope tentative data object
2080 declarations, file-scope (extern) function declarations (which
2081 had no corresponding body) and file-scope tagged type declarations
2082 and definitions which have not yet been forced out. */
2084 if (write_symbols
== DWARF_DEBUG
2085 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2086 dwarfout_file_scope_decl (decl
, 1);
2088 #ifdef DWARF2_DEBUGGING_INFO
2089 /* Output DWARF2 information for file-scope tentative data object
2090 declarations, file-scope (extern) function declarations (which
2091 had no corresponding body) and file-scope tagged type declarations
2092 and definitions which have not yet been forced out. */
2094 if (write_symbols
== DWARF2_DEBUG
2095 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2096 dwarf2out_decl (decl
);
2098 timevar_pop (TV_SYMOUT
);
2102 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2103 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2104 INPUT_FILENAME and LINENO accordingly. */
2107 push_srcloc (file
, line
)
2111 struct file_stack
*fs
;
2113 if (input_file_stack
)
2115 input_file_stack
->name
= input_filename
;
2116 input_file_stack
->line
= lineno
;
2119 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2120 fs
->name
= input_filename
= file
;
2121 fs
->line
= lineno
= line
;
2122 fs
->indent_level
= 0;
2123 fs
->next
= input_file_stack
;
2124 input_file_stack
= fs
;
2125 input_file_stack_tick
++;
2128 /* Pop the top entry off the stack of presently open source files.
2129 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2135 struct file_stack
*fs
;
2137 fs
= input_file_stack
;
2138 input_file_stack
= fs
->next
;
2140 input_file_stack_tick
++;
2141 /* The initial source file is never popped. */
2142 if (!input_file_stack
)
2144 input_filename
= input_file_stack
->name
;
2145 lineno
= input_file_stack
->line
;
2148 /* Compile an entire file of output from cpp, named NAME.
2149 Write a file of assembly output and various debugging dumps. */
2157 int name_specified
= name
!= 0;
2159 if (dump_base_name
== 0)
2160 dump_base_name
= name
? name
: "gccdump";
2165 /* Start timing total execution time. */
2168 timevar_start (TV_TOTAL
);
2170 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2171 because then the driver will have provided the name of a temporary
2172 file or bit bucket for us. */
2174 if (! name_specified
&& asm_file_name
== 0)
2175 asm_out_file
= stdout
;
2178 if (asm_file_name
== 0)
2180 int len
= strlen (dump_base_name
);
2181 char *dumpname
= (char *) xmalloc (len
+ 6);
2182 memcpy (dumpname
, dump_base_name
, len
+ 1);
2183 strip_off_ending (dumpname
, len
);
2184 strcat (dumpname
, ".s");
2185 asm_file_name
= dumpname
;
2187 if (!strcmp (asm_file_name
, "-"))
2188 asm_out_file
= stdout
;
2190 asm_out_file
= fopen (asm_file_name
, "w");
2191 if (asm_out_file
== 0)
2192 fatal_io_error ("can't open %s for writing", asm_file_name
);
2195 /* Initialize data in various passes. */
2198 name
= init_parse (name
);
2199 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2200 || debug_info_level
== DINFO_LEVEL_VERBOSE
2201 || flag_test_coverage
2202 || warn_notreached
);
2205 init_decl_processing ();
2211 init_function_once ();
2212 init_stor_layout_once ();
2213 init_varasm_once ();
2214 init_EXPR_INSN_LIST_cache ();
2216 /* The following initialization functions need to generate rtl, so
2217 provide a dummy function context for them. */
2218 init_dummy_function_start ();
2221 if (flag_caller_saves
)
2222 init_caller_save ();
2223 expand_dummy_function_end ();
2225 /* If auxiliary info generation is desired, open the output file.
2226 This goes in the same directory as the source file--unlike
2227 all the other output files. */
2228 if (flag_gen_aux_info
)
2230 aux_info_file
= fopen (aux_info_file_name
, "w");
2231 if (aux_info_file
== 0)
2232 fatal_io_error ("can't open %s", aux_info_file_name
);
2235 #ifdef IO_BUFFER_SIZE
2236 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2237 _IOFBF
, IO_BUFFER_SIZE
);
2241 name
= ggc_strdup (name
);
2243 input_filename
= name
;
2245 /* Put an entry on the input file stack for the main input file. */
2246 push_srcloc (input_filename
, 0);
2248 /* Perform language-specific initialization.
2249 This may set main_input_filename. */
2250 if (lang_hooks
.init
)
2251 (*lang_hooks
.init
) ();
2253 /* If the input doesn't start with a #line, use the input name
2254 as the official input file name. */
2255 if (main_input_filename
== 0)
2256 main_input_filename
= name
;
2258 if (flag_syntax_only
)
2260 write_symbols
= NO_DEBUG
;
2262 profile_block_flag
= 0;
2266 ASM_FILE_START (asm_out_file
);
2268 #ifdef ASM_COMMENT_START
2269 if (flag_verbose_asm
)
2271 /* Print the list of options in effect. */
2272 print_version (asm_out_file
, ASM_COMMENT_START
);
2273 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2274 ASM_COMMENT_START
, " ", "\n");
2275 /* Add a blank line here so it appears in assembler output but not
2277 fprintf (asm_out_file
, "\n");
2280 } /* ! flag_syntax_only */
2282 #ifndef ASM_OUTPUT_SECTION_NAME
2283 if (flag_function_sections
)
2285 warning ("-ffunction-sections not supported for this target.");
2286 flag_function_sections
= 0;
2288 if (flag_data_sections
)
2290 warning ("-fdata-sections not supported for this target.");
2291 flag_data_sections
= 0;
2295 if (flag_function_sections
2296 && (profile_flag
|| profile_block_flag
))
2298 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2299 flag_function_sections
= 0;
2302 #ifndef OBJECT_FORMAT_ELF
2303 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2304 warning ("-ffunction-sections may affect debugging on some targets.");
2307 /* If dbx symbol table desired, initialize writing it
2308 and output the predefined types. */
2309 timevar_push (TV_SYMOUT
);
2310 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2311 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2312 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2314 #ifdef SDB_DEBUGGING_INFO
2315 if (write_symbols
== SDB_DEBUG
)
2316 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2318 #ifdef DWARF_DEBUGGING_INFO
2319 if (write_symbols
== DWARF_DEBUG
)
2320 dwarfout_init (asm_out_file
, main_input_filename
);
2322 #ifdef DWARF2_UNWIND_INFO
2323 if (dwarf2out_do_frame ())
2324 dwarf2out_frame_init ();
2326 #ifdef DWARF2_DEBUGGING_INFO
2327 if (write_symbols
== DWARF2_DEBUG
)
2328 dwarf2out_init (asm_out_file
, main_input_filename
);
2330 timevar_pop (TV_SYMOUT
);
2332 /* Initialize yet another pass. */
2334 init_final (main_input_filename
);
2335 init_branch_prob (dump_base_name
);
2337 timevar_push (TV_PARSE
);
2339 /* Call the parser, which parses the entire file
2340 (calling rest_of_compilation for each function). */
2342 if (yyparse () != 0)
2344 if (errorcount
== 0)
2345 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2347 /* In case there were missing closebraces,
2348 get us back to the global binding level. */
2349 while (! global_bindings_p ())
2353 /* Compilation is now finished except for writing
2354 what's left of the symbol table output. */
2356 timevar_pop (TV_PARSE
);
2358 if (flag_syntax_only
)
2361 globals
= getdecls ();
2363 /* Really define vars that have had only a tentative definition.
2364 Really output inline functions that must actually be callable
2365 and have not been output so far. */
2368 int len
= list_length (globals
);
2369 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2373 /* Process the decls in reverse order--earliest first.
2374 Put them into VEC from back to front, then take out from front. */
2376 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2377 vec
[len
- i
- 1] = decl
;
2379 wrapup_global_declarations (vec
, len
);
2381 /* This must occur after the loop to output deferred functions. Else
2382 the profiler initializer would not be emitted if all the functions
2383 in this compilation unit were deferred.
2385 output_func_start_profiler can not cause any additional functions or
2386 data to need to be output, so it need not be in the deferred function
2388 output_func_start_profiler ();
2390 check_global_declarations (vec
, len
);
2396 /* Write out any pending weak symbol declarations. */
2400 /* Do dbx symbols. */
2401 timevar_push (TV_SYMOUT
);
2402 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2403 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2404 dbxout_finish (asm_out_file
, main_input_filename
);
2407 #ifdef DWARF_DEBUGGING_INFO
2408 if (write_symbols
== DWARF_DEBUG
)
2412 #ifdef DWARF2_UNWIND_INFO
2413 if (dwarf2out_do_frame ())
2414 dwarf2out_frame_finish ();
2417 #ifdef DWARF2_DEBUGGING_INFO
2418 if (write_symbols
== DWARF2_DEBUG
)
2419 dwarf2out_finish ();
2421 timevar_pop (TV_SYMOUT
);
2423 /* Output some stuff at end of file if nec. */
2425 dw2_output_indirect_constants ();
2427 end_final (dump_base_name
);
2429 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2431 timevar_push (TV_DUMP
);
2432 open_dump_file (DFI_bp
, NULL
);
2436 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2437 timevar_pop (TV_DUMP
);
2441 ASM_FILE_END (asm_out_file
);
2444 /* Attach a special .ident directive to the end of the file to identify
2445 the version of GCC which compiled this code. The format of the .ident
2446 string is patterned after the ones produced by native SVR4 compilers. */
2449 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2450 IDENT_ASM_OP
, version_string
);
2453 /* Language-specific end of compilation actions. */
2455 if (lang_hooks
.finish
)
2456 (*lang_hooks
.finish
) ();
2458 /* Close the dump files. */
2460 if (flag_gen_aux_info
)
2462 fclose (aux_info_file
);
2464 unlink (aux_info_file_name
);
2467 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2469 timevar_push (TV_DUMP
);
2470 dump_combine_total_stats (rtl_dump_file
);
2471 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2472 timevar_pop (TV_DUMP
);
2475 /* Close non-debugging input and output files. Take special care to note
2476 whether fclose returns an error, since the pages might still be on the
2477 buffer chain while the file is open. */
2481 if (ferror (asm_out_file
) != 0)
2482 fatal_io_error ("error writing to %s", asm_file_name
);
2483 if (fclose (asm_out_file
) != 0)
2484 fatal_io_error ("error closing %s", asm_file_name
);
2486 /* Do whatever is necessary to finish printing the graphs. */
2487 if (graph_dump_format
!= no_graph
)
2491 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2492 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2497 sprintf (seq
, ".%02d.", i
);
2498 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2499 finish_graph_dump_file (dump_base_name
, suffix
);
2506 ggc_print_statistics ();
2507 stringpool_statistics ();
2510 /* Free up memory for the benefit of leak detectors. */
2513 /* Stop timing total execution time. */
2514 timevar_stop (TV_TOTAL
);
2516 /* Print the times. */
2518 timevar_print (stderr
);
2521 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2522 and TYPE_DECL nodes.
2524 This does nothing for local (non-static) variables, unless the
2525 variable is a register variable with an ASMSPEC. In that case, or
2526 if the variable is not an automatic, it sets up the RTL and
2527 outputs any assembler code (label definition, storage allocation
2528 and initialization).
2530 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2531 the assembler symbol name to be used. TOP_LEVEL is nonzero
2532 if this declaration is not within a function. */
2535 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2537 const char *asmspec
;
2541 /* Declarations of variables, and of functions defined elsewhere. */
2543 /* The most obvious approach, to put an #ifndef around where
2544 this macro is used, doesn't work since it's inside a macro call. */
2545 #ifndef ASM_FINISH_DECLARE_OBJECT
2546 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2549 /* Forward declarations for nested functions are not "external",
2550 but we need to treat them as if they were. */
2551 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2552 || TREE_CODE (decl
) == FUNCTION_DECL
)
2554 timevar_push (TV_VARCONST
);
2556 make_decl_rtl (decl
, asmspec
);
2557 /* Don't output anything
2558 when a tentative file-scope definition is seen.
2559 But at end of compilation, do output code for them. */
2560 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2561 assemble_variable (decl
, top_level
, at_end
, 0);
2562 if (decl
== last_assemble_variable_decl
)
2564 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2567 timevar_pop (TV_VARCONST
);
2569 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2571 if (decode_reg_name (asmspec
) >= 0)
2573 SET_DECL_RTL (decl
, NULL_RTX
);
2574 make_decl_rtl (decl
, asmspec
);
2578 error ("invalid register name `%s' for register variable", asmspec
);
2579 DECL_REGISTER (decl
) = 0;
2584 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2585 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2586 && TREE_CODE (decl
) == TYPE_DECL
)
2588 timevar_push (TV_SYMOUT
);
2589 dbxout_symbol (decl
, 0);
2590 timevar_pop (TV_SYMOUT
);
2593 #ifdef SDB_DEBUGGING_INFO
2594 else if (write_symbols
== SDB_DEBUG
&& top_level
2595 && TREE_CODE (decl
) == TYPE_DECL
)
2597 timevar_push (TV_SYMOUT
);
2598 sdbout_symbol (decl
, 0);
2599 timevar_pop (TV_SYMOUT
);
2604 /* Called after finishing a record, union or enumeral type. */
2607 rest_of_type_compilation (type
, toplev
)
2608 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2612 tree type ATTRIBUTE_UNUSED
;
2613 int toplev ATTRIBUTE_UNUSED
;
2616 timevar_push (TV_SYMOUT
);
2617 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2618 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2619 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2621 #ifdef SDB_DEBUGGING_INFO
2622 if (write_symbols
== SDB_DEBUG
)
2623 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2625 #ifdef DWARF2_DEBUGGING_INFO
2626 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2627 dwarf2out_decl (TYPE_STUB_DECL (type
));
2629 timevar_pop (TV_SYMOUT
);
2632 /* DECL is an inline function, whose body is present, but which is not
2633 being output at this point. (We're putting that off until we need
2634 to do it.) If there are any actions that need to take place,
2635 including the emission of debugging information for the function,
2636 this is where they should go. This function may be called by
2637 language-dependent code for front-ends that do not even generate
2638 RTL for functions that don't need to be put out. */
2641 note_deferral_of_defined_inline_function (decl
)
2642 tree decl ATTRIBUTE_UNUSED
;
2644 #ifdef DWARF_DEBUGGING_INFO
2645 /* Generate the DWARF info for the "abstract" instance of a function
2646 which we may later generate inlined and/or out-of-line instances
2648 if (write_symbols
== DWARF_DEBUG
2649 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2650 && ! DECL_ABSTRACT_ORIGIN (decl
))
2652 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2653 DWARF code expects it to be set in this case. Intuitively,
2654 DECL is the function we just finished defining, so setting
2655 CURRENT_FUNCTION_DECL is sensible. */
2656 tree saved_cfd
= current_function_decl
;
2657 int was_abstract
= DECL_ABSTRACT (decl
);
2658 current_function_decl
= decl
;
2660 /* Let the DWARF code do its work. */
2661 set_decl_abstract_flags (decl
, 1);
2662 dwarfout_file_scope_decl (decl
, 0);
2664 set_decl_abstract_flags (decl
, 0);
2666 /* Reset CURRENT_FUNCTION_DECL. */
2667 current_function_decl
= saved_cfd
;
2672 /* FNDECL is an inline function which is about to be emitted out of line.
2673 Do any preparation, such as emitting abstract debug info for the inline
2674 before it gets mangled by optimization. */
2677 note_outlining_of_inline_function (fndecl
)
2678 tree fndecl ATTRIBUTE_UNUSED
;
2680 #ifdef DWARF2_DEBUGGING_INFO
2681 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2682 the abstract description of inline functions until something tries to
2683 reference them. Force it out now, before optimizations mangle the
2685 if (write_symbols
== DWARF2_DEBUG
)
2686 dwarf2out_abstract_function (fndecl
);
2690 /* This is called from finish_function (within yyparse)
2691 after each top-level definition is parsed.
2692 It is supposed to compile that function or variable
2693 and output the assembler code for it.
2694 After we return, the tree storage is freed. */
2697 rest_of_compilation (decl
)
2703 int rebuild_label_notes_after_reload
;
2704 int register_life_up_to_date
;
2706 timevar_push (TV_REST_OF_COMPILATION
);
2708 /* Now that we're out of the frontend, we shouldn't have any more
2709 CONCATs anywhere. */
2710 generating_concat_p
= 0;
2712 /* When processing delayed functions, prepare_function_start() won't
2713 have been run to re-initialize it. */
2714 cse_not_expected
= ! optimize
;
2716 /* First, make sure that NOTE_BLOCK is set correctly for each
2717 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2718 if (!cfun
->x_whole_function_mode_p
)
2721 /* Then remove any notes we don't need. That will make iterating
2722 over the instruction sequence faster, and allow the garbage
2723 collector to reclaim the memory used by the notes. */
2724 remove_unnecessary_notes ();
2726 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2727 tree in sensible shape. So, we just recalculate it here. */
2728 if (cfun
->x_whole_function_mode_p
)
2733 /* If we are reconsidering an inline function
2734 at the end of compilation, skip the stuff for making it inline. */
2736 if (DECL_SAVED_INSNS (decl
) == 0)
2742 /* If this is nested inside an inlined external function, pretend
2743 it was only declared. Since we cannot inline such functions,
2744 generating code for this one is not only not necessary but will
2745 confuse some debugging output writers. */
2746 for (parent
= DECL_CONTEXT (current_function_decl
);
2747 parent
!= NULL_TREE
;
2748 parent
= get_containing_scope (parent
))
2749 if (TREE_CODE (parent
) == FUNCTION_DECL
2750 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2752 DECL_INITIAL (decl
) = 0;
2753 goto exit_rest_of_compilation
;
2756 /* If requested, consider whether to make this function inline. */
2757 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2758 || flag_inline_functions
)
2760 timevar_push (TV_INTEGRATION
);
2761 lose
= function_cannot_inline_p (decl
);
2762 timevar_pop (TV_INTEGRATION
);
2763 if (lose
|| ! optimize
)
2765 if (warn_inline
&& DECL_INLINE (decl
))
2766 warning_with_decl (decl
, lose
);
2767 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2768 /* Don't really compile an extern inline function.
2769 If we can't make it inline, pretend
2770 it was only declared. */
2771 if (DECL_EXTERNAL (decl
))
2773 DECL_INITIAL (decl
) = 0;
2774 goto exit_rest_of_compilation
;
2778 /* ??? Note that this has the effect of making it look
2779 like "inline" was specified for a function if we choose
2780 to inline it. This isn't quite right, but it's
2781 probably not worth the trouble to fix. */
2782 inlinable
= DECL_INLINE (decl
) = 1;
2785 insns
= get_insns ();
2787 /* Dump the rtl code if we are dumping rtl. */
2789 if (open_dump_file (DFI_rtl
, decl
))
2791 if (DECL_SAVED_INSNS (decl
))
2792 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2793 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2796 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2797 sorts of eh initialization. Delay this until after the
2798 initial rtl dump so that we can see the original nesting. */
2799 convert_from_eh_region_ranges ();
2801 /* If function is inline, and we don't yet know whether to
2802 compile it by itself, defer decision till end of compilation.
2803 finish_compilation will call rest_of_compilation again
2804 for those functions that need to be output. Also defer those
2805 functions that we are supposed to defer. */
2808 || (DECL_INLINE (decl
)
2809 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2810 && ! flag_keep_inline_functions
)
2811 || DECL_EXTERNAL (decl
))))
2812 DECL_DEFER_OUTPUT (decl
) = 1;
2814 if (DECL_INLINE (decl
))
2815 /* DWARF wants seperate debugging info for abstract and
2816 concrete instances of all inline functions, including those
2817 declared inline but not inlined, and those inlined even
2818 though they weren't declared inline. Conveniently, that's
2819 what DECL_INLINE means at this point. */
2820 note_deferral_of_defined_inline_function (decl
);
2822 if (DECL_DEFER_OUTPUT (decl
))
2824 /* If -Wreturn-type, we have to do a bit of compilation. We just
2825 want to call jump_optimize to figure out whether or not we can
2826 fall off the end of the function; we do the minimum amount of
2827 work necessary to make that safe. And, we set optimize to zero
2828 to keep jump_optimize from working too hard. */
2829 if (warn_return_type
)
2831 int saved_optimize
= optimize
;
2834 find_exception_handler_labels ();
2835 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2836 !JUMP_AFTER_REGSCAN
);
2837 optimize
= saved_optimize
;
2840 current_function_nothrow
= nothrow_function_p ();
2841 if (current_function_nothrow
)
2842 /* Now we know that this can't throw; set the flag for the benefit
2843 of other functions later in this translation unit. */
2844 TREE_NOTHROW (current_function_decl
) = 1;
2846 timevar_push (TV_INTEGRATION
);
2847 save_for_inline (decl
);
2848 timevar_pop (TV_INTEGRATION
);
2849 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2850 goto exit_rest_of_compilation
;
2853 /* If specified extern inline but we aren't inlining it, we are
2854 done. This goes for anything that gets here with DECL_EXTERNAL
2855 set, not just things with DECL_INLINE. */
2856 if (DECL_EXTERNAL (decl
))
2857 goto exit_rest_of_compilation
;
2862 /* Initialize some variables used by the optimizers. */
2863 init_function_for_compilation ();
2865 if (! DECL_DEFER_OUTPUT (decl
))
2866 TREE_ASM_WRITTEN (decl
) = 1;
2868 /* Now that integrate will no longer see our rtl, we need not
2869 distinguish between the return value of this function and the
2870 return value of called functions. Also, we can remove all SETs
2871 of subregs of hard registers; they are only here because of
2873 rtx_equal_function_value_matters
= 0;
2874 purge_hard_subreg_sets (get_insns ());
2876 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2877 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2878 goto exit_rest_of_compilation
;
2880 /* We may have potential sibling or tail recursion sites. Select one
2881 (of possibly multiple) methods of performing the call. */
2882 if (flag_optimize_sibling_calls
)
2884 timevar_push (TV_JUMP
);
2885 open_dump_file (DFI_sibling
, decl
);
2887 optimize_sibling_and_tail_recursive_calls ();
2889 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2890 timevar_pop (TV_JUMP
);
2893 /* Complete generation of exception handling code. */
2894 find_exception_handler_labels ();
2897 timevar_push (TV_JUMP
);
2898 open_dump_file (DFI_eh
, decl
);
2900 finish_eh_generation ();
2902 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2903 timevar_pop (TV_JUMP
);
2907 /* If we are doing position-independent code generation, now
2908 is the time to output special prologues and epilogues.
2909 We do not want to do this earlier, because it just clutters
2910 up inline functions with meaningless insns. */
2915 insns
= get_insns ();
2917 /* Copy any shared structure that should not be shared. */
2918 unshare_all_rtl (current_function_decl
, insns
);
2920 #ifdef SETJMP_VIA_SAVE_AREA
2921 /* This must be performed before virutal register instantiation. */
2922 if (current_function_calls_alloca
)
2923 optimize_save_area_alloca (insns
);
2926 /* Instantiate all virtual registers. */
2927 instantiate_virtual_regs (current_function_decl
, insns
);
2929 open_dump_file (DFI_jump
, decl
);
2931 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2932 are initialized and to compute whether control can drop off the end
2935 timevar_push (TV_JUMP
);
2936 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2937 before jump optimization switches branch directions. */
2938 expected_value_to_br_prob ();
2940 reg_scan (insns
, max_reg_num (), 0);
2941 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2942 JUMP_AFTER_REGSCAN
);
2944 timevar_pop (TV_JUMP
);
2946 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2947 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2949 close_dump_file (DFI_jump
, print_rtl
, insns
);
2950 goto exit_rest_of_compilation
;
2953 timevar_push (TV_JUMP
);
2957 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2960 /* ??? Run if-conversion before delete_null_pointer_checks,
2961 since the later does not preserve the CFG. This should
2962 be changed -- no since converting if's that are going to
2964 timevar_push (TV_IFCVT
);
2966 timevar_pop (TV_IFCVT
);
2968 /* Try to identify useless null pointer tests and delete them. */
2969 if (flag_delete_null_pointer_checks
)
2970 delete_null_pointer_checks (insns
);
2973 /* Jump optimization, and the removal of NULL pointer checks, may
2974 have reduced the number of instructions substantially. CSE, and
2975 future passes, allocate arrays whose dimensions involve the
2976 maximum instruction UID, so if we can reduce the maximum UID
2977 we'll save big on memory. */
2978 renumber_insns (rtl_dump_file
);
2979 timevar_pop (TV_JUMP
);
2981 close_dump_file (DFI_jump
, print_rtl
, insns
);
2985 /* Perform common subexpression elimination.
2986 Nonzero value from `cse_main' means that jumps were simplified
2987 and some code may now be unreachable, so do
2988 jump optimization again. */
2992 open_dump_file (DFI_cse
, decl
);
2993 timevar_push (TV_CSE
);
2995 reg_scan (insns
, max_reg_num (), 1);
2997 if (flag_thread_jumps
)
2999 timevar_push (TV_JUMP
);
3000 thread_jumps (insns
, max_reg_num (), 1);
3001 timevar_pop (TV_JUMP
);
3004 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3006 /* If we are not running more CSE passes, then we are no longer
3007 expecting CSE to be run. But always rerun it in a cheap mode. */
3008 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3010 if (tem
|| optimize
> 1)
3012 timevar_push (TV_JUMP
);
3013 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3014 !JUMP_AFTER_REGSCAN
);
3015 timevar_pop (TV_JUMP
);
3018 /* Run this after jump optmizations remove all the unreachable code
3019 so that unreachable code will not keep values live. */
3020 delete_trivially_dead_insns (insns
, max_reg_num ());
3022 /* Try to identify useless null pointer tests and delete them. */
3023 if (flag_delete_null_pointer_checks
)
3025 timevar_push (TV_JUMP
);
3026 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3030 delete_null_pointer_checks (insns
);
3031 timevar_pop (TV_JUMP
);
3034 /* The second pass of jump optimization is likely to have
3035 removed a bunch more instructions. */
3036 renumber_insns (rtl_dump_file
);
3038 timevar_pop (TV_CSE
);
3039 close_dump_file (DFI_cse
, print_rtl
, insns
);
3042 open_dump_file (DFI_addressof
, decl
);
3044 purge_addressof (insns
);
3045 reg_scan (insns
, max_reg_num (), 1);
3047 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3051 if (optimize
> 0 && flag_ssa
)
3053 /* Convert to SSA form. */
3055 timevar_push (TV_TO_SSA
);
3056 open_dump_file (DFI_ssa
, decl
);
3058 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3062 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3063 timevar_pop (TV_TO_SSA
);
3065 /* The SSA implementation uses basic block numbers in its phi
3066 nodes. Thus, changing the control-flow graph or the basic
3067 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3068 may cause problems. */
3072 /* Remove dead code. */
3074 timevar_push (TV_DEAD_CODE_ELIM
);
3075 open_dump_file (DFI_dce
, decl
);
3077 insns
= get_insns ();
3078 eliminate_dead_code();
3080 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3081 timevar_pop (TV_DEAD_CODE_ELIM
);
3084 /* Convert from SSA form. */
3086 timevar_push (TV_FROM_SSA
);
3087 open_dump_file (DFI_ussa
, decl
);
3089 convert_from_ssa ();
3090 /* New registers have been created. Rescan their usage. */
3091 reg_scan (insns
, max_reg_num (), 1);
3092 /* Life analysis used in SSA adds log_links but these
3093 shouldn't be there until the flow stage, so clear
3095 clear_log_links (insns
);
3097 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3098 timevar_pop (TV_FROM_SSA
);
3103 /* Perform global cse. */
3105 if (optimize
> 0 && flag_gcse
)
3107 int save_csb
, save_cfj
;
3110 timevar_push (TV_GCSE
);
3111 open_dump_file (DFI_gcse
, decl
);
3113 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3115 tem
= gcse_main (insns
, rtl_dump_file
);
3117 save_csb
= flag_cse_skip_blocks
;
3118 save_cfj
= flag_cse_follow_jumps
;
3119 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3121 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3123 if (flag_expensive_optimizations
)
3125 timevar_push (TV_CSE
);
3126 reg_scan (insns
, max_reg_num (), 1);
3127 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3128 timevar_pop (TV_CSE
);
3129 cse_not_expected
= !flag_rerun_cse_after_loop
;
3132 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3133 things up. Then possibly re-run CSE again. */
3137 timevar_push (TV_JUMP
);
3138 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3139 !JUMP_AFTER_REGSCAN
);
3140 timevar_pop (TV_JUMP
);
3142 if (flag_expensive_optimizations
)
3144 timevar_push (TV_CSE
);
3145 reg_scan (insns
, max_reg_num (), 1);
3146 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3147 timevar_pop (TV_CSE
);
3151 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3152 timevar_pop (TV_GCSE
);
3155 flag_cse_skip_blocks
= save_csb
;
3156 flag_cse_follow_jumps
= save_cfj
;
3159 /* Move constant computations out of loops. */
3163 timevar_push (TV_LOOP
);
3164 open_dump_file (DFI_loop
, decl
);
3166 if (flag_rerun_loop_opt
)
3168 /* We only want to perform unrolling once. */
3170 loop_optimize (insns
, rtl_dump_file
, 0);
3172 /* The first call to loop_optimize makes some instructions
3173 trivially dead. We delete those instructions now in the
3174 hope that doing so will make the heuristics in loop work
3175 better and possibly speed up compilation. */
3176 delete_trivially_dead_insns (insns
, max_reg_num ());
3178 /* The regscan pass is currently necessary as the alias
3179 analysis code depends on this information. */
3180 reg_scan (insns
, max_reg_num (), 1);
3182 loop_optimize (insns
, rtl_dump_file
,
3183 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3185 close_dump_file (DFI_loop
, print_rtl
, insns
);
3186 timevar_pop (TV_LOOP
);
3193 timevar_push (TV_CSE2
);
3194 open_dump_file (DFI_cse2
, decl
);
3196 if (flag_rerun_cse_after_loop
)
3198 /* Running another jump optimization pass before the second
3199 cse pass sometimes simplifies the RTL enough to allow
3200 the second CSE pass to do a better job. Jump_optimize can change
3201 max_reg_num so we must rerun reg_scan afterwards.
3202 ??? Rework to not call reg_scan so often. */
3203 timevar_push (TV_JUMP
);
3205 /* The previous call to loop_optimize makes some instructions
3206 trivially dead. We delete those instructions now in the
3207 hope that doing so will make the heuristics in jump work
3208 better and possibly speed up compilation. */
3209 delete_trivially_dead_insns (insns
, max_reg_num ());
3211 reg_scan (insns
, max_reg_num (), 0);
3212 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3213 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3215 timevar_push (TV_IFCVT
);
3217 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3221 timevar_pop(TV_IFCVT
);
3223 timevar_pop (TV_JUMP
);
3225 reg_scan (insns
, max_reg_num (), 0);
3226 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3230 timevar_push (TV_JUMP
);
3231 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3232 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3233 timevar_pop (TV_JUMP
);
3237 if (flag_thread_jumps
)
3239 /* This pass of jump threading straightens out code
3240 that was kinked by loop optimization. */
3241 timevar_push (TV_JUMP
);
3242 reg_scan (insns
, max_reg_num (), 0);
3243 thread_jumps (insns
, max_reg_num (), 0);
3244 timevar_pop (TV_JUMP
);
3247 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3248 timevar_pop (TV_CSE2
);
3253 cse_not_expected
= 1;
3257 /* Do control and data flow analysis; wrote some of the results to
3260 timevar_push (TV_FLOW
);
3261 open_dump_file (DFI_cfg
, decl
);
3263 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3265 check_function_return_warnings ();
3267 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3269 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3271 timevar_push (TV_BRANCH_PROB
);
3272 open_dump_file (DFI_bp
, decl
);
3276 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3277 timevar_pop (TV_BRANCH_PROB
);
3280 open_dump_file (DFI_life
, decl
);
3285 /* Discover and record the loop depth at the head of each basic
3286 block. The loop infrastructure does the real job for us. */
3287 flow_loops_find (&loops
, LOOP_TREE
);
3289 /* Estimate using heuristics if no profiling info is available. */
3290 if (flag_guess_branch_prob
)
3291 estimate_probability (&loops
);
3294 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3296 flow_loops_free (&loops
);
3298 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3299 mark_constant_function ();
3300 timevar_pop (TV_FLOW
);
3302 register_life_up_to_date
= 1;
3305 if (warn_uninitialized
|| extra_warnings
)
3307 uninitialized_vars_warning (DECL_INITIAL (decl
));
3309 setjmp_args_warning ();
3312 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3316 /* If -opt, try combining insns through substitution. */
3320 int rebuild_jump_labels_after_combine
= 0;
3322 timevar_push (TV_COMBINE
);
3323 open_dump_file (DFI_combine
, decl
);
3325 rebuild_jump_labels_after_combine
3326 = combine_instructions (insns
, max_reg_num ());
3328 /* Combining insns may have turned an indirect jump into a
3329 direct jump. Rebuid the JUMP_LABEL fields of jumping
3331 if (rebuild_jump_labels_after_combine
)
3333 timevar_push (TV_JUMP
);
3334 rebuild_jump_labels (insns
);
3335 timevar_pop (TV_JUMP
);
3337 timevar_push (TV_FLOW
);
3338 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3341 /* Blimey. We've got to have the CFG up to date for the call to
3342 if_convert below. However, the random deletion of blocks
3343 without updating life info can wind up with Wierd Stuff in
3344 global_live_at_end. We then run sched1, which updates things
3345 properly, discovers the wierdness and aborts. */
3346 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3347 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3348 | PROP_SCAN_DEAD_CODE
);
3350 timevar_pop (TV_FLOW
);
3353 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3354 timevar_pop (TV_COMBINE
);
3359 /* Rerun if-conversion, as combine may have simplified things enough to
3360 now meet sequence length restrictions. */
3363 timevar_push (TV_IFCVT
);
3364 open_dump_file (DFI_ce
, decl
);
3370 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3371 timevar_pop (TV_IFCVT
);
3374 /* Register allocation pre-pass, to reduce number of moves
3375 necessary for two-address machines. */
3376 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3378 timevar_push (TV_REGMOVE
);
3379 open_dump_file (DFI_regmove
, decl
);
3381 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3383 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3384 timevar_pop (TV_REGMOVE
);
3389 /* Any of the several passes since flow1 will have munged register
3390 lifetime data a bit. */
3392 register_life_up_to_date
= 0;
3394 #ifdef OPTIMIZE_MODE_SWITCHING
3395 timevar_push (TV_GCSE
);
3397 if (optimize_mode_switching (NULL
))
3399 /* We did work, and so had to regenerate global life information.
3400 Take advantage of this and don't re-recompute register life
3401 information below. */
3402 register_life_up_to_date
= 1;
3405 timevar_pop (TV_GCSE
);
3408 #ifdef INSN_SCHEDULING
3410 /* Print function header into sched dump now
3411 because doing the sched analysis makes some of the dump. */
3412 if (optimize
> 0 && flag_schedule_insns
)
3414 timevar_push (TV_SCHED
);
3415 open_dump_file (DFI_sched
, decl
);
3417 /* Do control and data sched analysis,
3418 and write some of the results to dump file. */
3420 schedule_insns (rtl_dump_file
);
3422 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3423 timevar_pop (TV_SCHED
);
3427 /* Register lifetime information was updated as part of verifying
3429 register_life_up_to_date
= 1;
3433 /* Determine if the current function is a leaf before running reload
3434 since this can impact optimizations done by the prologue and
3435 epilogue thus changing register elimination offsets. */
3436 current_function_is_leaf
= leaf_function_p ();
3438 timevar_push (TV_LOCAL_ALLOC
);
3439 open_dump_file (DFI_lreg
, decl
);
3441 /* Allocate pseudo-regs that are used only within 1 basic block.
3443 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3444 jump optimizer after register allocation and reloading are finished. */
3446 if (! register_life_up_to_date
)
3447 recompute_reg_usage (insns
, ! optimize_size
);
3448 regclass (insns
, max_reg_num (), rtl_dump_file
);
3449 rebuild_label_notes_after_reload
= local_alloc ();
3451 timevar_pop (TV_LOCAL_ALLOC
);
3453 if (dump_file
[DFI_lreg
].enabled
)
3455 timevar_push (TV_DUMP
);
3457 dump_flow_info (rtl_dump_file
);
3458 dump_local_alloc (rtl_dump_file
);
3460 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3461 timevar_pop (TV_DUMP
);
3466 timevar_push (TV_GLOBAL_ALLOC
);
3467 open_dump_file (DFI_greg
, decl
);
3469 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3470 pass fixing up any insns that are invalid. */
3473 failure
= global_alloc (rtl_dump_file
);
3476 build_insn_chain (insns
);
3477 failure
= reload (insns
, 0);
3480 timevar_pop (TV_GLOBAL_ALLOC
);
3482 if (dump_file
[DFI_greg
].enabled
)
3484 timevar_push (TV_DUMP
);
3486 dump_global_regs (rtl_dump_file
);
3488 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3489 timevar_pop (TV_DUMP
);
3493 goto exit_rest_of_compilation
;
3497 open_dump_file (DFI_postreload
, decl
);
3499 /* Do a very simple CSE pass over just the hard registers. */
3502 timevar_push (TV_RELOAD_CSE_REGS
);
3503 reload_cse_regs (insns
);
3504 timevar_pop (TV_RELOAD_CSE_REGS
);
3507 /* If optimizing, then go ahead and split insns now since we are about
3508 to recompute flow information anyway. Since we can't split insns after
3509 reload, do the splitting unconditionally here to avoid gcc from losing
3517 int old_labelnum
= max_label_num ();
3519 split_all_insns (0);
3520 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3523 /* Register allocation and reloading may have turned an indirect jump into
3524 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3525 jumping instructions. */
3526 if (rebuild_label_notes_after_reload
)
3528 timevar_push (TV_JUMP
);
3530 rebuild_jump_labels (insns
);
3532 timevar_pop (TV_JUMP
);
3535 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3537 /* Re-create the death notes which were deleted during reload. */
3538 timevar_push (TV_FLOW2
);
3539 open_dump_file (DFI_flow2
, decl
);
3541 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3542 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3543 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3545 /* On some machines, the prologue and epilogue code, or parts thereof,
3546 can be represented as RTL. Doing so lets us schedule insns between
3547 it and the rest of the code and also allows delayed branch
3548 scheduling to operate in the epilogue. */
3549 thread_prologue_and_epilogue_insns (insns
);
3554 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3556 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3557 even for machines with possibly nonzero RETURN_POPS_ARGS
3558 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3559 push instructions will have popping returns. */
3560 #ifndef PUSH_ROUNDING
3561 if (!ACCUMULATE_OUTGOING_ARGS
)
3563 combine_stack_adjustments ();
3568 flow2_completed
= 1;
3570 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3571 timevar_pop (TV_FLOW2
);
3573 #ifdef HAVE_peephole2
3574 if (optimize
> 0 && flag_peephole2
)
3576 timevar_push (TV_PEEPHOLE2
);
3577 open_dump_file (DFI_peephole2
, decl
);
3579 peephole2_optimize (rtl_dump_file
);
3581 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3582 timevar_pop (TV_PEEPHOLE2
);
3586 if (optimize
> 0 && flag_rename_registers
)
3588 timevar_push (TV_RENAME_REGISTERS
);
3589 open_dump_file (DFI_rnreg
, decl
);
3591 regrename_optimize ();
3593 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3594 timevar_pop (TV_RENAME_REGISTERS
);
3599 timevar_push (TV_IFCVT2
);
3600 open_dump_file (DFI_ce2
, decl
);
3604 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3605 timevar_pop (TV_IFCVT2
);
3608 #ifdef INSN_SCHEDULING
3609 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3611 timevar_push (TV_SCHED2
);
3612 open_dump_file (DFI_sched2
, decl
);
3614 /* Do control and data sched analysis again,
3615 and write some more of the results to dump file. */
3617 schedule_insns (rtl_dump_file
);
3619 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3620 timevar_pop (TV_SCHED2
);
3626 #ifdef LEAF_REGISTERS
3627 current_function_uses_only_leaf_regs
3628 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3631 if (optimize
> 0 && flag_reorder_blocks
)
3633 timevar_push (TV_REORDER_BLOCKS
);
3634 open_dump_file (DFI_bbro
, decl
);
3636 reorder_basic_blocks ();
3638 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3639 timevar_pop (TV_REORDER_BLOCKS
);
3642 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3643 Also do cross-jumping this time and delete no-op move insns. */
3647 timevar_push (TV_JUMP
);
3648 open_dump_file (DFI_jump2
, decl
);
3650 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3651 !JUMP_AFTER_REGSCAN
);
3653 /* CFG no longer kept up to date. */
3655 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3656 timevar_pop (TV_JUMP
);
3659 /* If a machine dependent reorganization is needed, call it. */
3660 #ifdef MACHINE_DEPENDENT_REORG
3661 open_dump_file (DFI_mach
, decl
);
3663 MACHINE_DEPENDENT_REORG (insns
);
3665 close_dump_file (DFI_mach
, print_rtl
, insns
);
3670 /* If a scheduling pass for delayed branches is to be done,
3671 call the scheduling code. */
3674 if (optimize
> 0 && flag_delayed_branch
)
3676 timevar_push (TV_DBR_SCHED
);
3677 open_dump_file (DFI_dbr
, decl
);
3679 dbr_schedule (insns
, rtl_dump_file
);
3681 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3682 timevar_pop (TV_DBR_SCHED
);
3688 timevar_push (TV_SHORTEN_BRANCH
);
3690 #ifdef HAVE_ATTR_length
3697 split_all_insns (0);
3698 timevar_pop (TV_SHORTEN_BRANCH
);
3701 timevar_push (TV_REG_STACK
);
3702 open_dump_file (DFI_stack
, decl
);
3704 reg_to_stack (insns
, rtl_dump_file
);
3706 close_dump_file (DFI_stack
, print_rtl
, insns
);
3707 timevar_pop (TV_REG_STACK
);
3712 convert_to_eh_region_ranges ();
3714 /* Shorten branches. */
3715 timevar_push (TV_SHORTEN_BRANCH
);
3716 shorten_branches (get_insns ());
3717 timevar_pop (TV_SHORTEN_BRANCH
);
3719 current_function_nothrow
= nothrow_function_p ();
3720 if (current_function_nothrow
)
3721 /* Now we know that this can't throw; set the flag for the benefit
3722 of other functions later in this translation unit. */
3723 TREE_NOTHROW (current_function_decl
) = 1;
3725 /* Now turn the rtl into assembler code. */
3727 timevar_push (TV_FINAL
);
3732 /* Get the function's name, as described by its RTL. This may be
3733 different from the DECL_NAME name used in the source file. */
3735 x
= DECL_RTL (decl
);
3736 if (GET_CODE (x
) != MEM
)
3739 if (GET_CODE (x
) != SYMBOL_REF
)
3741 fnname
= XSTR (x
, 0);
3743 assemble_start_function (decl
, fnname
);
3744 final_start_function (insns
, asm_out_file
, optimize
);
3745 final (insns
, asm_out_file
, optimize
, 0);
3746 final_end_function (insns
, asm_out_file
, optimize
);
3748 #ifdef IA64_UNWIND_INFO
3749 /* ??? The IA-64 ".handlerdata" directive must be issued before
3750 the ".endp" directive that closes the procedure descriptor. */
3751 output_function_exception_table ();
3754 assemble_end_function (decl
, fnname
);
3756 #ifndef IA64_UNWIND_INFO
3757 /* Otherwise, it feels unclean to switch sections in the middle. */
3758 output_function_exception_table ();
3762 fflush (asm_out_file
);
3764 /* Release all memory allocated by flow. */
3765 free_basic_block_vars (0);
3767 /* Release all memory held by regsets now. */
3768 regset_release_memory ();
3770 timevar_pop (TV_FINAL
);
3774 /* Write DBX symbols if requested. */
3776 /* Note that for those inline functions where we don't initially
3777 know for certain that we will be generating an out-of-line copy,
3778 the first invocation of this routine (rest_of_compilation) will
3779 skip over this code by doing a `goto exit_rest_of_compilation;'.
3780 Later on, finish_compilation will call rest_of_compilation again
3781 for those inline functions that need to have out-of-line copies
3782 generated. During that call, we *will* be routed past here. */
3784 timevar_push (TV_SYMOUT
);
3785 #ifdef DBX_DEBUGGING_INFO
3786 if (write_symbols
== DBX_DEBUG
)
3787 dbxout_function (decl
);
3790 #ifdef DWARF_DEBUGGING_INFO
3791 if (write_symbols
== DWARF_DEBUG
)
3792 dwarfout_file_scope_decl (decl
, 0);
3795 #ifdef DWARF2_DEBUGGING_INFO
3796 if (write_symbols
== DWARF2_DEBUG
)
3797 dwarf2out_decl (decl
);
3799 timevar_pop (TV_SYMOUT
);
3801 exit_rest_of_compilation
:
3803 /* In case the function was not output,
3804 don't leave any temporary anonymous types
3805 queued up for sdb output. */
3806 #ifdef SDB_DEBUGGING_INFO
3807 if (write_symbols
== SDB_DEBUG
)
3808 sdbout_types (NULL_TREE
);
3811 reload_completed
= 0;
3812 flow2_completed
= 0;
3815 timevar_push (TV_FINAL
);
3817 /* Clear out the insn_length contents now that they are no
3819 init_insn_lengths ();
3821 /* Clear out the real_constant_chain before some of the rtx's
3822 it runs through become garbage. */
3823 clear_const_double_mem ();
3825 /* Show no temporary slots allocated. */
3828 free_basic_block_vars (0);
3830 timevar_pop (TV_FINAL
);
3832 /* Make sure volatile mem refs aren't considered valid operands for
3833 arithmetic insns. We must call this here if this is a nested inline
3834 function, since the above code leaves us in the init_recog state
3835 (from final.c), and the function context push/pop code does not
3836 save/restore volatile_ok.
3838 ??? Maybe it isn't necessary for expand_start_function to call this
3839 anymore if we do it here? */
3841 init_recog_no_volatile ();
3843 /* We're done with this function. Free up memory if we can. */
3844 free_after_parsing (cfun
);
3845 if (! DECL_DEFER_OUTPUT (decl
))
3846 free_after_compilation (cfun
);
3851 timevar_pop (TV_REST_OF_COMPILATION
);
3861 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3862 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3863 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3864 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3865 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3866 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"));
3868 for (i
= ARRAY_SIZE (f_options
); i
--;)
3870 const char *description
= f_options
[i
].description
;
3872 if (description
!= NULL
&& * description
!= 0)
3873 printf (" -f%-21s %s\n",
3874 f_options
[i
].string
, _(description
));
3877 printf (_(" -O[number] Set optimisation level to [number]\n"));
3878 printf (_(" -Os Optimise for space rather than speed\n"));
3879 for (i
= sizeof (compiler_params
); i
--;)
3881 const char *description
= compiler_params
[i
].help
;
3882 const int length
= 21-strlen(compiler_params
[i
].option
);
3884 if (description
!= NULL
&& * description
!= 0)
3885 printf (" --param %s=<value>%.*s%s\n",
3886 compiler_params
[i
].option
,
3887 length
> 0 ? length
: 1, " ",
3890 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3891 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3892 printf (_(" -w Suppress warnings\n"));
3893 printf (_(" -W Enable extra warnings\n"));
3895 for (i
= ARRAY_SIZE (W_options
); i
--;)
3897 const char *description
= W_options
[i
].description
;
3899 if (description
!= NULL
&& * description
!= 0)
3900 printf (" -W%-21s %s\n",
3901 W_options
[i
].string
, _(description
));
3904 printf (_(" -Wunused Enable unused warnings\n"));
3905 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3906 printf (_(" -p Enable function profiling\n"));
3907 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3908 printf (_(" -a Enable block profiling \n"));
3910 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3911 printf (_(" -ax Enable jump profiling \n"));
3913 printf (_(" -o <file> Place output into <file> \n"));
3915 -G <number> Put global and static data smaller than <number>\n\
3916 bytes into a special section (on some targets)\n"));
3918 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3920 if (debug_args
[i
].description
!= NULL
)
3921 printf (" -g%-21s %s\n",
3922 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3925 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3926 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3927 printf (_(" -version Display the compiler's version\n"));
3928 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3929 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3930 #if defined INSN_SCHEDULING
3931 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3933 printf (_(" --help Display this information\n"));
3938 /* Display descriptions of language specific options.
3939 If there is no description, note that there is an undocumented option.
3940 If the description is empty, do not display anything. (This allows
3941 options to be deliberately undocumented, for whatever reason).
3942 If the option string is missing, then this is a marker, indicating
3943 that the description string is in fact the name of a language, whose
3944 language specific options are to follow. */
3946 if (ARRAY_SIZE (documented_lang_options
) > 1)
3948 printf (_("\nLanguage specific options:\n"));
3950 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3952 const char *description
= documented_lang_options
[i
].description
;
3953 const char *option
= documented_lang_options
[i
].option
;
3955 if (description
== NULL
)
3960 printf (_(" %-23.23s [undocumented]\n"), option
);
3962 else if (*description
== 0)
3964 else if (option
== NULL
)
3968 (_("\nThere are undocumented %s specific options as well.\n"),
3972 printf (_("\n Options for %s:\n"), description
);
3977 printf (" %-23.23s %s\n", option
, _(description
));
3982 printf (_("\nThere are undocumented %s specific options as well.\n"),
3985 display_target_options ();
3989 display_target_options ()
3993 if (ARRAY_SIZE (target_switches
) > 1
3994 #ifdef TARGET_OPTIONS
3995 || ARRAY_SIZE (target_options
) > 1
4003 printf (_("\nTarget specific options:\n"));
4005 for (i
= ARRAY_SIZE (target_switches
); i
--;)
4007 const char *option
= target_switches
[i
].name
;
4008 const char *description
= target_switches
[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
));
4023 #ifdef TARGET_OPTIONS
4024 for (i
= ARRAY_SIZE (target_options
); i
--;)
4026 const char *option
= target_options
[i
].prefix
;
4027 const char *description
= target_options
[i
].description
;
4029 if (option
== NULL
|| *option
== 0)
4031 else if (description
== NULL
)
4036 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4038 else if (* description
!= 0)
4039 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4045 printf (_("\nThere are undocumented target specific options as well.\n"));
4047 printf (_(" They exist, but they are not documented.\n"));
4052 /* Parse a -d... comand line switch. */
4055 decode_d_option (arg
)
4064 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4065 dump_file
[i
].enabled
= 1;
4071 flag_print_asm_name
= 1;
4074 flag_dump_rtl_in_asm
= 1;
4075 flag_print_asm_name
= 1;
4078 graph_dump_format
= vcg
;
4081 rtl_dump_and_exit
= 1;
4086 case 'D': /* These are handled by the preprocessor. */
4092 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4093 if (c
== dump_file
[i
].debug_switch
)
4095 dump_file
[i
].enabled
= 1;
4100 warning ("unrecognized gcc debugging option: %c", c
);
4105 /* Parse a -f... comand line switch. ARG is the value after the -f.
4106 It is safe to access 'ARG - 2' to generate the full switch name.
4107 Return the number of strings consumed. */
4110 decode_f_option (arg
)
4114 const char *option_value
= NULL
;
4116 /* Search for the option in the table of binary f options. */
4117 for (j
= ARRAY_SIZE (f_options
); j
--;)
4119 if (!strcmp (arg
, f_options
[j
].string
))
4121 *f_options
[j
].variable
= f_options
[j
].on_value
;
4125 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4126 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4128 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4133 if (!strcmp (arg
, "fast-math"))
4134 set_fast_math_flags();
4135 else if (!strcmp (arg
, "no-fast-math"))
4136 set_no_fast_math_flags();
4137 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4138 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4141 read_integral_parameter (option_value
, arg
- 2,
4143 set_param_value ("max-inline-insns", val
);
4145 #ifdef INSN_SCHEDULING
4146 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4147 fix_sched_param ("verbose", option_value
);
4149 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4150 fix_register (option_value
, 1, 1);
4151 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4152 fix_register (option_value
, 0, 1);
4153 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4154 fix_register (option_value
, 0, 0);
4155 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4156 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4157 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4159 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4160 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4161 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4162 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4164 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4165 else if ((option_value
4166 = skip_leading_substring (arg
, "stack-limit-register=")))
4168 int reg
= decode_reg_name (option_value
);
4170 error ("unrecognized register name `%s'", option_value
);
4172 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4174 else if ((option_value
4175 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4178 nm
= ggc_strdup (option_value
);
4179 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4181 else if ((option_value
4182 = skip_leading_substring (arg
, "message-length=")))
4183 diagnostic_message_length_per_line
=
4184 read_integral_parameter (option_value
, arg
- 2,
4185 diagnostic_message_length_per_line
);
4186 else if ((option_value
4187 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4189 if (!strcmp (option_value
, "once"))
4190 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4191 else if (!strcmp (option_value
, "every-line"))
4192 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4194 error ("Unrecognized option `%s'", arg
- 2);
4196 else if (!strcmp (arg
, "no-stack-limit"))
4197 stack_limit_rtx
= NULL_RTX
;
4198 else if (!strcmp (arg
, "preprocessed"))
4199 /* Recognise this switch but do nothing. This prevents warnings
4200 about an unrecognized switch if cpplib has not been linked in. */
4208 /* Parse a -W... comand line switch. ARG is the value after the -W.
4209 It is safe to access 'ARG - 2' to generate the full switch name.
4210 Return the number of strings consumed. */
4213 decode_W_option (arg
)
4216 const char *option_value
= NULL
;
4219 /* Search for the option in the table of binary W options. */
4221 for (j
= ARRAY_SIZE (W_options
); j
--;)
4223 if (!strcmp (arg
, W_options
[j
].string
))
4225 *W_options
[j
].variable
= W_options
[j
].on_value
;
4229 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4230 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4232 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4237 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4238 warning ("-Wid-clash-LEN is no longer supported");
4239 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4241 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4243 warn_larger_than
= larger_than_size
!= -1;
4245 else if (!strcmp (arg
, "unused"))
4249 else if (!strcmp (arg
, "no-unused"))
4259 /* Parse a -g... comand line switch. ARG is the value after the -g.
4260 It is safe to access 'ARG - 2' to generate the full switch name.
4261 Return the number of strings consumed. */
4264 decode_g_option (arg
)
4268 /* A lot of code assumes write_symbols == NO_DEBUG if the
4269 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4270 of what debugging type has been selected). This records the
4271 selected type. It is an error to specify more than one
4273 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4274 /* Non-zero if debugging format has been explicitly set.
4275 -g and -ggdb don't explicitly set the debugging format so
4276 -gdwarf -g3 is equivalent to -gdwarf3. */
4277 static int type_explicitly_set_p
= 0;
4278 /* Indexed by enum debug_info_type. */
4279 static const char *debug_type_names
[] =
4281 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4284 /* The maximum admissible debug level value. */
4285 static const unsigned max_debug_level
= 3;
4287 /* Look up ARG in the table. */
4288 for (da
= debug_args
; da
->arg
; da
++)
4290 const int da_len
= strlen (da
->arg
);
4292 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4294 enum debug_info_type type
= da
->debug_type
;
4295 const char *p
= arg
+ da_len
;
4297 if (*p
&& (*p
< '0' || *p
> '9'))
4300 /* A debug flag without a level defaults to level 2.
4301 Note we do not want to call read_integral_parameter
4302 for that case since it will call atoi which
4305 ??? We may want to generalize the interface to
4306 read_integral_parameter to better handle this case
4307 if this case shows up often. */
4309 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4313 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4315 error ("use -gdwarf -g%d for DWARF v1, level %d",
4318 error ("use -gdwarf-2 for DWARF v2");
4321 if (level
> max_debug_level
)
4324 ignoring option `%s' due to invalid debug level specification",
4326 level
= debug_info_level
;
4329 if (type
== NO_DEBUG
)
4331 type
= PREFERRED_DEBUGGING_TYPE
;
4333 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4335 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4336 type
= DWARF2_DEBUG
;
4338 #ifdef DBX_DEBUGGING_INFO
4345 if (type
== NO_DEBUG
)
4346 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4348 /* Does it conflict with an already selected type? */
4349 if (type_explicitly_set_p
4350 /* -g/-ggdb don't conflict with anything. */
4351 && da
->debug_type
!= NO_DEBUG
4352 && type
!= selected_debug_type
)
4353 warning ("`%s' ignored, conflicts with `-g%s'",
4354 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4357 /* If the format has already been set, -g/-ggdb
4358 only change the debug level. */
4359 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4360 /* Don't change debugging type. */
4364 selected_debug_type
= type
;
4365 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4368 write_symbols
= (level
== 0
4370 : selected_debug_type
);
4371 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4372 debug_info_level
= (enum debug_info_level
) level
;
4385 /* Decode the first argument in the argv as a language-independent option.
4386 Return the number of strings consumed. */
4389 independent_decode_option (argc
, argv
)
4393 char *arg
= argv
[0];
4395 if (arg
[0] != '-' || arg
[1] == 0)
4407 if (!strcmp (arg
, "-help"))
4410 exit_after_options
= 1;
4413 if (!strcmp (arg
, "-target-help"))
4415 display_target_options ();
4416 exit_after_options
= 1;
4419 if (!strcmp (arg
, "-version"))
4421 print_version (stderr
, "");
4422 exit_after_options
= 1;
4425 /* Handle '--param <name>=<value>'. */
4426 if (strcmp (arg
, "-param") == 0)
4432 error ("-param option missing argument");
4436 /* Get the '<name>=<value>' parameter. */
4438 /* Look for the `='. */
4439 equal
= strchr (arg
, '=');
4441 error ("invalid --param option: %s", arg
);
4446 /* Zero out the `=' sign so that we get two separate strings. */
4448 /* Figure out what value is specified. */
4449 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4450 if (val
!= INVALID_PARAM_VAL
)
4451 set_param_value (arg
, val
);
4453 error ("invalid parameter value `%s'", equal
+ 1);
4468 /* Already been treated in main (). Do nothing. */
4472 set_target_switch (arg
+ 1);
4476 return decode_f_option (arg
+ 1);
4479 return decode_g_option (arg
+ 1);
4482 if (!strcmp (arg
, "dumpbase"))
4487 dump_base_name
= argv
[1];
4491 decode_d_option (arg
+ 1);
4495 if (!strcmp (arg
, "pedantic"))
4497 else if (!strcmp (arg
, "pedantic-errors"))
4498 flag_pedantic_errors
= pedantic
= 1;
4499 else if (arg
[1] == 0)
4506 if (!strcmp (arg
, "quiet"))
4513 if (!strcmp (arg
, "version"))
4521 inhibit_warnings
= 1;
4530 /* We save the value of warn_uninitialized, since if they put
4531 -Wuninitialized on the command line, we need to generate a
4532 warning about not using it without also specifying -O. */
4533 if (warn_uninitialized
!= 1)
4534 warn_uninitialized
= 2;
4537 return decode_W_option (arg
+ 1);
4543 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4544 warning ("`-a' option (basic block profile) not supported");
4546 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4549 else if (!strcmp (arg
, "ax"))
4551 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4552 warning ("`-ax' option (jump profiling) not supported");
4554 profile_block_flag
= (!profile_block_flag
4555 || profile_block_flag
== 2) ? 2 : 3;
4558 else if (!strncmp (arg
, "aux-info", 8))
4560 flag_gen_aux_info
= 1;
4566 aux_info_file_name
= argv
[1];
4570 aux_info_file_name
= arg
+ 8;
4582 asm_file_name
= argv
[1];
4597 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4602 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4606 if (g_switch_val
== -1)
4610 g_switch_set
= TRUE
;
4611 g_switch_value
= g_switch_val
;
4621 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4622 Decode command args, then call compile_file.
4623 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4624 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4626 It is not safe to call this function more than once. */
4629 toplev_main (argc
, argv
)
4636 /* save in case md file wants to emit args as a comment. */
4640 p
= argv
[0] + strlen (argv
[0]);
4641 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4645 xmalloc_set_program_name (progname
);
4647 /* LC_CTYPE determines the character set used by the terminal so it has be set
4648 to output messages correctly. */
4650 #ifdef HAVE_LC_MESSAGES
4651 setlocale (LC_CTYPE
, "");
4652 setlocale (LC_MESSAGES
, "");
4654 setlocale (LC_ALL
, "");
4657 (void) bindtextdomain (PACKAGE
, localedir
);
4658 (void) textdomain (PACKAGE
);
4660 /* Install handler for SIGFPE, which may be received while we do
4661 compile-time floating point arithmetic. */
4662 signal (SIGFPE
, float_signal
);
4664 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4666 signal (SIGSEGV
, crash_signal
);
4669 signal (SIGILL
, crash_signal
);
4672 signal (SIGBUS
, crash_signal
);
4675 signal (SIGABRT
, crash_signal
);
4677 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4678 signal (SIGIOT
, crash_signal
);
4681 decl_printable_name
= decl_name
;
4682 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4684 /* Initialize whether `char' is signed. */
4685 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4686 #ifdef DEFAULT_SHORT_ENUMS
4687 /* Initialize how much space enums occupy, by default. */
4688 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4691 /* Initialize the garbage-collector. */
4694 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4695 ggc_add_tree_root (¤t_function_decl
, 1);
4696 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4698 /* Initialize the diagnostics reporting machinery. */
4699 initialize_diagnostics ();
4701 /* Register the language-independent parameters. */
4702 add_params (lang_independent_params
, LAST_PARAM
);
4704 /* Perform language-specific options intialization. */
4705 if (lang_hooks
.init_options
)
4706 (*lang_hooks
.init_options
) ();
4708 /* Scan to see what optimization level has been specified. That will
4709 determine the default value of many flags. */
4710 for (i
= 1; i
< argc
; i
++)
4712 if (!strcmp (argv
[i
], "-O"))
4717 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4719 /* Handle -Os, -O2, -O3, -O69, ... */
4720 char *p
= &argv
[i
][2];
4722 if ((p
[0] == 's') && (p
[1] == 0))
4726 /* Optimizing for size forces optimize to be 2. */
4731 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4732 if (optimize_val
!= -1)
4734 optimize
= optimize_val
;
4744 flag_thread_jumps
= 1;
4746 flag_delayed_branch
= 1;
4748 #ifdef CAN_DEBUG_WITHOUT_FP
4749 flag_omit_frame_pointer
= 1;
4751 flag_guess_branch_prob
= 1;
4756 flag_optimize_sibling_calls
= 1;
4757 flag_cse_follow_jumps
= 1;
4758 flag_cse_skip_blocks
= 1;
4760 flag_expensive_optimizations
= 1;
4761 flag_strength_reduce
= 1;
4762 flag_rerun_cse_after_loop
= 1;
4763 flag_rerun_loop_opt
= 1;
4764 flag_caller_saves
= 1;
4767 #ifdef INSN_SCHEDULING
4768 flag_schedule_insns
= 1;
4769 flag_schedule_insns_after_reload
= 1;
4772 flag_strict_aliasing
= 1;
4773 flag_delete_null_pointer_checks
= 1;
4774 flag_reorder_blocks
= 1;
4779 flag_inline_functions
= 1;
4780 flag_rename_registers
= 1;
4783 if (optimize
< 2 || optimize_size
)
4788 align_functions
= 1;
4791 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4794 set_target_switch ("");
4796 /* Unwind tables are always present in an ABI-conformant IA-64
4797 object file, so the default should be ON. */
4798 #ifdef IA64_UNWIND_INFO
4799 flag_unwind_tables
= IA64_UNWIND_INFO
;
4802 #ifdef OPTIMIZATION_OPTIONS
4803 /* Allow default optimizations to be specified on a per-machine basis. */
4804 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4807 /* Initialize register usage now so switches may override. */
4810 /* Perform normal command line switch decoding. */
4811 for (i
= 1; i
< argc
;)
4814 int indep_processed
;
4816 /* Give the language a chance to decode the option for itself. */
4817 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4819 if (lang_processed
>= 0)
4820 /* Now see if the option also has a language independent meaning.
4821 Some options are both language specific and language independent,
4823 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4826 lang_processed
= -lang_processed
;
4827 indep_processed
= 0;
4830 if (lang_processed
|| indep_processed
)
4831 i
+= MAX (lang_processed
, indep_processed
);
4834 const char *option
= NULL
;
4835 const char *lang
= NULL
;
4838 /* It is possible that the command line switch is not valid for the
4839 current language, but it is valid for another language. In order
4840 to be compatible with previous versions of the compiler (which
4841 did not issue an error message in this case) we check for this
4842 possibility here. If we do find a match, then if extra_warnings
4843 is set we generate a warning message, otherwise we will just
4844 ignore the option. */
4845 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4847 option
= documented_lang_options
[j
].option
;
4850 lang
= documented_lang_options
[j
].description
;
4851 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4855 if (j
!= ARRAY_SIZE (documented_lang_options
))
4859 warning ("Ignoring command line option '%s'", argv
[i
]);
4862 ("(It is valid for %s but not the selected language)",
4866 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4867 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4869 error ("Unrecognized option `%s'", argv
[i
]);
4875 /* All command line options have been processed. */
4876 if (lang_hooks
.post_options
)
4877 (*lang_hooks
.post_options
) ();
4879 if (exit_after_options
)
4882 /* Reflect any language-specific diagnostic option setting. */
4883 reshape_diagnostic_buffer ();
4885 /* Checker uses the frame pointer. */
4886 if (flag_check_memory_usage
)
4887 flag_omit_frame_pointer
= 0;
4891 /* Inlining does not work if not optimizing,
4892 so force it not to be done. */
4896 /* The c_decode_option function and decode_option hook set
4897 this to `2' if -Wall is used, so we can avoid giving out
4898 lots of errors for people who don't realize what -Wall does. */
4899 if (warn_uninitialized
== 1)
4900 warning ("-Wuninitialized is not supported without -O");
4903 /* We do not currently support sibling-call optimization in the
4904 presence of exceptions. See PR2975 for a test-case that will
4905 fail if we try to combine both of these features. */
4906 if (flag_exceptions
)
4907 flag_optimize_sibling_calls
= 0;
4909 #ifdef OVERRIDE_OPTIONS
4910 /* Some machines may reject certain combinations of options. */
4914 /* Set up the align_*_log variables, defaulting them to 1 if they
4915 were still unset. */
4916 if (align_loops
<= 0) align_loops
= 1;
4917 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4918 if (align_jumps
<= 0) align_jumps
= 1;
4919 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4920 if (align_labels
<= 0) align_labels
= 1;
4921 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4922 if (align_functions
<= 0) align_functions
= 1;
4923 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4925 if (profile_block_flag
== 3)
4927 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4928 profile_block_flag
= 2;
4931 /* Unrolling all loops implies that standard loop unrolling must also
4933 if (flag_unroll_all_loops
)
4934 flag_unroll_loops
= 1;
4935 /* Loop unrolling requires that strength_reduction be on also. Silently
4936 turn on strength reduction here if it isn't already on. Also, the loop
4937 unrolling code assumes that cse will be run after loop, so that must
4938 be turned on also. */
4939 if (flag_unroll_loops
)
4941 flag_strength_reduce
= 1;
4942 flag_rerun_cse_after_loop
= 1;
4945 /* Warn about options that are not supported on this machine. */
4946 #ifndef INSN_SCHEDULING
4947 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4948 warning ("instruction scheduling not supported on this target machine");
4951 if (flag_delayed_branch
)
4952 warning ("this target machine does not have delayed branches");
4955 /* Some operating systems do not allow profiling without a frame
4957 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4959 && flag_omit_frame_pointer
)
4961 error ("profiling does not work without a frame pointer");
4962 flag_omit_frame_pointer
= 0;
4965 user_label_prefix
= USER_LABEL_PREFIX
;
4966 if (flag_leading_underscore
!= -1)
4968 /* If the default prefix is more complicated than "" or "_",
4969 issue a warning and ignore this option. */
4970 if (user_label_prefix
[0] == 0 ||
4971 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4973 user_label_prefix
= flag_leading_underscore
? "_" : "";
4976 warning ("-f%sleading-underscore not supported on this target machine",
4977 flag_leading_underscore
? "" : "no-");
4980 /* If we are in verbose mode, write out the version and maybe all the
4981 option flags in use. */
4984 print_version (stderr
, "");
4986 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4989 compile_file (filename
);
4992 return (FATAL_EXIT_CODE
);
4994 return (FATAL_EXIT_CODE
);
4995 return (SUCCESS_EXIT_CODE
);
4998 /* Decode -m switches. */
4999 /* Decode the switch -mNAME. */
5002 set_target_switch (name
)
5006 int valid_target_option
= 0;
5008 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5009 if (!strcmp (target_switches
[j
].name
, name
))
5011 if (target_switches
[j
].value
< 0)
5012 target_flags
&= ~-target_switches
[j
].value
;
5014 target_flags
|= target_switches
[j
].value
;
5015 valid_target_option
= 1;
5018 #ifdef TARGET_OPTIONS
5019 if (!valid_target_option
)
5020 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5022 int len
= strlen (target_options
[j
].prefix
);
5023 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5025 *target_options
[j
].variable
= name
+ len
;
5026 valid_target_option
= 1;
5031 if (!valid_target_option
)
5032 error ("Invalid option `%s'", name
);
5035 /* Print version information to FILE.
5036 Each line begins with INDENT (for the case where FILE is the
5037 assembler output file). */
5040 print_version (file
, indent
)
5045 #define __VERSION__ "[?]"
5049 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5051 "%s%s%s version %s (%s) compiled by CC.\n"
5053 , indent
, *indent
!= 0 ? " " : "",
5054 language_string
, version_string
, TARGET_NAME
,
5055 indent
, __VERSION__
);
5058 /* Print an option value and return the adjusted position in the line.
5059 ??? We don't handle error returns from fprintf (disk full); presumably
5060 other code will catch a disk full though. */
5063 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5066 const char *indent
, *sep
, *term
, *type
, *name
;
5068 /* The ultrix fprintf returns 0 on success, so compute the result we want
5069 here since we need it for the following test. */
5070 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5075 fprintf (file
, "%s", term
);
5080 fprintf (file
, "%s", indent
);
5081 pos
= strlen (indent
);
5083 fprintf (file
, "%s%s%s", sep
, type
, name
);
5088 /* Print active target switches to FILE.
5089 POS is the current cursor position and MAX is the size of a "line".
5090 Each line begins with INDENT and ends with TERM.
5091 Each switch is separated from the next by SEP. */
5094 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5097 const char *indent
, *sep
, *term
;
5102 /* Print the options as passed. */
5104 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5105 _("options passed: "), "");
5107 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5111 if (strcmp (*p
, "-o") == 0)
5117 if (strcmp (*p
, "-quiet") == 0)
5119 if (strcmp (*p
, "-version") == 0)
5124 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5127 fprintf (file
, "%s", term
);
5129 /* Print the -f and -m options that have been enabled.
5130 We don't handle language specific options but printing argv
5133 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5134 _("options enabled: "), "");
5136 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5137 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5138 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5139 "-f", f_options
[j
].string
);
5141 /* Print target specific options. */
5143 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5144 if (target_switches
[j
].name
[0] != '\0'
5145 && target_switches
[j
].value
> 0
5146 && ((target_switches
[j
].value
& target_flags
)
5147 == target_switches
[j
].value
))
5149 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5150 "-m", target_switches
[j
].name
);
5153 #ifdef TARGET_OPTIONS
5154 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5155 if (*target_options
[j
].variable
!= NULL
)
5158 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5159 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5160 prefix
, *target_options
[j
].variable
);
5164 fprintf (file
, "%s", term
);
5167 /* Record the beginning of a new source file, named FILENAME. */
5170 debug_start_source_file (filename
)
5171 register const char *filename ATTRIBUTE_UNUSED
;
5173 #ifdef DBX_DEBUGGING_INFO
5174 if (write_symbols
== DBX_DEBUG
)
5175 dbxout_start_new_source_file (filename
);
5177 #ifdef DWARF_DEBUGGING_INFO
5178 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5179 && write_symbols
== DWARF_DEBUG
)
5180 dwarfout_start_new_source_file (filename
);
5181 #endif /* DWARF_DEBUGGING_INFO */
5182 #ifdef DWARF2_DEBUGGING_INFO
5183 if (write_symbols
== DWARF2_DEBUG
)
5184 dwarf2out_start_source_file (filename
);
5185 #endif /* DWARF2_DEBUGGING_INFO */
5186 #ifdef SDB_DEBUGGING_INFO
5187 if (write_symbols
== SDB_DEBUG
)
5188 sdbout_start_new_source_file (filename
);
5192 /* Record the resumption of a source file. LINENO is the line number in
5193 the source file we are returning to. */
5196 debug_end_source_file (lineno
)
5197 register unsigned lineno ATTRIBUTE_UNUSED
;
5199 #ifdef DBX_DEBUGGING_INFO
5200 if (write_symbols
== DBX_DEBUG
)
5201 dbxout_resume_previous_source_file ();
5203 #ifdef DWARF_DEBUGGING_INFO
5204 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5205 && write_symbols
== DWARF_DEBUG
)
5206 dwarfout_resume_previous_source_file (lineno
);
5207 #endif /* DWARF_DEBUGGING_INFO */
5208 #ifdef DWARF2_DEBUGGING_INFO
5209 if (write_symbols
== DWARF2_DEBUG
)
5210 dwarf2out_end_source_file ();
5211 #endif /* DWARF2_DEBUGGING_INFO */
5212 #ifdef SDB_DEBUGGING_INFO
5213 if (write_symbols
== SDB_DEBUG
)
5214 sdbout_resume_previous_source_file ();
5218 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5219 the tail part of the directive line, i.e. the part which is past the
5220 initial whitespace, #, whitespace, directive-name, whitespace part. */
5223 debug_define (lineno
, buffer
)
5224 register unsigned lineno ATTRIBUTE_UNUSED
;
5225 register const char *buffer ATTRIBUTE_UNUSED
;
5227 #ifdef DWARF_DEBUGGING_INFO
5228 if (write_symbols
== DWARF_DEBUG
)
5229 dwarfout_define (lineno
, buffer
);
5230 #endif /* DWARF_DEBUGGING_INFO */
5231 #ifdef DWARF2_DEBUGGING_INFO
5232 if (write_symbols
== DWARF2_DEBUG
)
5233 dwarf2out_define (lineno
, buffer
);
5234 #endif /* DWARF2_DEBUGGING_INFO */
5237 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5238 the tail part of the directive line, i.e. the part which is past the
5239 initial whitespace, #, whitespace, directive-name, whitespace part. */
5242 debug_undef (lineno
, buffer
)
5243 register unsigned lineno ATTRIBUTE_UNUSED
;
5244 register const char *buffer ATTRIBUTE_UNUSED
;
5246 #ifdef DWARF_DEBUGGING_INFO
5247 if (write_symbols
== DWARF_DEBUG
)
5248 dwarfout_undef (lineno
, buffer
);
5249 #endif /* DWARF_DEBUGGING_INFO */
5250 #ifdef DWARF2_DEBUGGING_INFO
5251 if (write_symbols
== DWARF2_DEBUG
)
5252 dwarf2out_undef (lineno
, buffer
);
5253 #endif /* DWARF2_DEBUGGING_INFO */
5256 /* Returns nonzero if it is appropriate not to emit any debugging
5257 information for BLOCK, because it doesn't contain any instructions.
5258 This may not be the case for blocks containing nested functions, since
5259 we may actually call such a function even though the BLOCK information
5263 debug_ignore_block (block
)
5264 tree block ATTRIBUTE_UNUSED
;
5266 /* Never delete the BLOCK for the outermost scope
5267 of the function; we can refer to names from
5268 that scope even if the block notes are messed up. */
5269 if (is_body_block (block
))
5272 #ifdef DWARF2_DEBUGGING_INFO
5273 if (write_symbols
== DWARF2_DEBUG
)
5274 return dwarf2out_ignore_block (block
);