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"
68 #include "integrate.h"
71 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
72 #include "dwarf2out.h"
75 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
79 #ifdef SDB_DEBUGGING_INFO
84 /* The extra parameters substantially improve the I/O performance. */
87 vms_fopen (fname
, type
)
91 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
92 fixed arguments, which matches ANSI's specification but not VAXCRTL's
93 pre-ANSI implementation. This hack circumvents the mismatch problem. */
94 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
97 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
98 "deq=64", "fop=tef", "shr=nil");
100 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
103 #define fopen vms_fopen
106 #ifndef DEFAULT_GDB_EXTENSIONS
107 #define DEFAULT_GDB_EXTENSIONS 1
110 /* If more than one debugging type is supported, you must define
111 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
113 This is one long line cause VAXC can't handle a \-newline. */
114 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
115 #ifndef PREFERRED_DEBUGGING_TYPE
116 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
117 #endif /* no PREFERRED_DEBUGGING_TYPE */
118 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
119 so the following code needn't care. */
120 #ifdef DBX_DEBUGGING_INFO
121 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
123 #ifdef SDB_DEBUGGING_INFO
124 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
126 #ifdef DWARF_DEBUGGING_INFO
127 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
129 #ifdef DWARF2_DEBUGGING_INFO
130 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
132 #ifdef XCOFF_DEBUGGING_INFO
133 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
135 #endif /* More than one debugger format enabled. */
137 /* If still not defined, must have been because no debugging formats
139 #ifndef PREFERRED_DEBUGGING_TYPE
140 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
143 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
144 extern char **environ
;
147 /* Carry information from ASM_DECLARE_OBJECT_NAME
148 to ASM_FINISH_DECLARE_OBJECT. */
150 extern int size_directive_output
;
151 extern tree last_assemble_variable_decl
;
153 static void set_target_switch
PARAMS ((const char *));
154 static const char *decl_name
PARAMS ((tree
, int));
156 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
157 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
158 static void compile_file
PARAMS ((const char *));
159 static void display_help
PARAMS ((void));
160 static void display_target_options
PARAMS ((void));
162 static void decode_d_option
PARAMS ((const char *));
163 static int decode_f_option
PARAMS ((const char *));
164 static int decode_W_option
PARAMS ((const char *));
165 static int decode_g_option
PARAMS ((const char *));
166 static unsigned int independent_decode_option
PARAMS ((int, char **));
168 static void print_version
PARAMS ((FILE *, const char *));
169 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
170 const char *, const char *,
171 const char *, const char *));
172 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
173 const char *, const char *));
175 /* Length of line when printing switch values. */
178 /* Name of program invoked, sans directories. */
180 const char *progname
;
182 /* Copy of arguments to toplev_main. */
186 /* Name of current original source file (what was input to cpp).
187 This comes from each #-command in the actual input. */
189 const char *input_filename
;
191 /* Name of top-level original source file (what was input to cpp).
192 This comes from the #-command at the beginning of the actual input.
193 If there isn't any there, then this is the cc1 input file name. */
195 const char *main_input_filename
;
197 /* Current line number in real source file. */
201 /* Nonzero if it is unsafe to create any new pseudo registers. */
204 /* Stack of currently pending input files. */
206 struct file_stack
*input_file_stack
;
208 /* Incremented on each change to input_file_stack. */
209 int input_file_stack_tick
;
211 /* Name to use as base of names for dump output files. */
213 const char *dump_base_name
;
215 /* Bit flags that specify the machine subtype we are compiling for.
216 Bits are tested using macros TARGET_... defined in the tm.h file
217 and set by `-m...' switches. Must be defined in rtlanal.c. */
219 extern int target_flags
;
221 /* Debug hooks - dependent upon command line options. */
223 struct gcc_debug_hooks
*debug_hooks
;
225 /* Describes a dump file. */
227 struct dump_file_info
229 /* The unique extension to apply, e.g. ".jump". */
230 const char *const extension
;
232 /* The -d<c> character that enables this dump file. */
233 char const debug_switch
;
235 /* True if there is a corresponding graph dump file. */
236 char const graph_dump_p
;
238 /* True if the user selected this dump. */
241 /* True if the files have been initialized (ie truncated). */
245 /* Enumerate the extant dump files. */
284 /* Describes all the dump files. Should be kept in order of the
285 pass and in sync with dump_file_index above.
287 Remaining -d letters:
293 struct dump_file_info dump_file
[DFI_MAX
] =
295 { "rtl", 'r', 0, 0, 0 },
296 { "sibling", 'i', 0, 0, 0 },
297 { "eh", 'h', 0, 0, 0 },
298 { "jump", 'j', 0, 0, 0 },
299 { "ssa", 'e', 1, 0, 0 },
300 { "ssaccp", 'W', 1, 0, 0 },
301 { "ssadce", 'X', 1, 0, 0 },
302 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
303 { "cse", 's', 0, 0, 0 },
304 { "addressof", 'F', 0, 0, 0 },
305 { "gcse", 'G', 1, 0, 0 },
306 { "loop", 'L', 1, 0, 0 },
307 { "cse2", 't', 1, 0, 0 },
308 { "cfg", 'f', 1, 0, 0 },
309 { "bp", 'b', 1, 0, 0 },
310 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
311 { "combine", 'c', 1, 0, 0 },
312 { "ce", 'C', 1, 0, 0 },
313 { "regmove", 'N', 1, 0, 0 },
314 { "sched", 'S', 1, 0, 0 },
315 { "lreg", 'l', 1, 0, 0 },
316 { "greg", 'g', 1, 0, 0 },
317 { "postreload", 'o', 1, 0, 0 },
318 { "flow2", 'w', 1, 0, 0 },
319 { "peephole2", 'z', 1, 0, 0 },
320 { "rnreg", 'n', 1, 0, 0 },
321 { "ce2", 'E', 1, 0, 0 },
322 { "sched2", 'R', 1, 0, 0 },
323 { "stack", 'k', 1, 0, 0 },
324 { "bbro", 'B', 1, 0, 0 },
325 { "mach", 'M', 1, 0, 0 },
326 { "dbr", 'd', 0, 0, 0 },
329 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
330 static void close_dump_file
PARAMS ((enum dump_file_index
,
331 void (*) (FILE *, rtx
), rtx
));
333 /* Other flags saying which kinds of debugging dump have been requested. */
335 int rtl_dump_and_exit
;
336 int flag_print_asm_name
;
337 static int version_flag
;
338 static char *filename
;
339 enum graph_dump_types graph_dump_format
;
341 /* Name for output file of assembly code, specified with -o. */
345 /* Value of the -G xx switch, and whether it was passed or not. */
349 /* Type(s) of debugging information we are producing (if any).
350 See flags.h for the definitions of the different possible
351 types of debugging information. */
352 enum debug_info_type write_symbols
= NO_DEBUG
;
354 /* Level of debugging information we are producing. See flags.h
355 for the definitions of the different possible levels. */
356 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
358 /* Nonzero means use GNU-only extensions in the generated symbolic
359 debugging information. */
360 /* Currently, this only has an effect when write_symbols is set to
361 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
362 int use_gnu_debug_info_extensions
= 0;
364 /* Nonzero means do optimizations. -O.
365 Particular numeric values stand for particular amounts of optimization;
366 thus, -O2 stores 2 here. However, the optimizations beyond the basic
367 ones are not controlled directly by this variable. Instead, they are
368 controlled by individual `flag_...' variables that are defaulted
369 based on this variable. */
373 /* Nonzero means optimize for size. -Os.
374 The only valid values are zero and non-zero. When optimize_size is
375 non-zero, optimize defaults to 2, but certain individual code
376 bloating optimizations are disabled. */
378 int optimize_size
= 0;
380 /* Nonzero if we should exit after parsing options. */
381 static int exit_after_options
= 0;
383 /* The FUNCTION_DECL for the function currently being compiled,
384 or 0 if between functions. */
385 tree current_function_decl
;
387 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
389 tree current_function_func_begin_label
;
391 /* Pointer to function to compute the name to use to print a declaration.
392 DECL is the declaration in question.
393 VERBOSITY determines what information will be printed:
394 0: DECL_NAME, demangled as necessary.
395 1: and scope information.
396 2: and any other information that might be interesting, such as function
397 parameter types in C++. */
399 const char *(*decl_printable_name
) PARAMS ((tree
, int));
401 /* Pointer to function to compute rtl for a language-specific tree code. */
403 typedef rtx (*lang_expand_expr_t
)
404 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
405 enum expand_modifier modifier
));
407 lang_expand_expr_t lang_expand_expr
= 0;
409 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
411 /* Pointer to function to finish handling an incomplete decl at the
412 end of compilation. */
414 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
416 /* Nonzero if doing dwarf2 duplicate elimination. */
418 int flag_eliminate_dwarf2_dups
= 0;
420 /* Nonzero if generating code to do profiling. */
422 int profile_flag
= 0;
424 /* Nonzero if generating code to do profiling on a line-by-line basis. */
426 int profile_block_flag
;
428 /* Nonzero if generating code to profile program flow graph arcs. */
430 int profile_arc_flag
= 0;
432 /* Nonzero if generating info for gcov to calculate line test coverage. */
434 int flag_test_coverage
= 0;
436 /* Nonzero indicates that branch taken probabilities should be calculated. */
438 int flag_branch_probabilities
= 0;
440 /* Nonzero if basic blocks should be reordered. */
442 int flag_reorder_blocks
= 0;
444 /* Nonzero if registers should be renamed. */
446 int flag_rename_registers
= 0;
448 /* Nonzero for -pedantic switch: warn about anything
449 that standard spec forbids. */
453 /* Temporarily suppress certain warnings.
454 This is set while reading code from a system header file. */
456 int in_system_header
= 0;
458 /* Don't print functions as they are compiled. -quiet. */
462 /* Print times taken by the various passes. -ftime-report. */
466 /* Print memory still in use at end of compilation (which may have little
467 to do with peak memory consumption). -fmem-report. */
471 /* Non-zero means to collect statistics which might be expensive
472 and to print them when we are done. */
473 int flag_detailed_statistics
= 0;
478 /* Nonzero means `char' should be signed. */
480 int flag_signed_char
;
482 /* Nonzero means give an enum type only as many bytes as it needs. */
484 int flag_short_enums
;
486 /* Nonzero for -fcaller-saves: allocate values in regs that need to
487 be saved across function calls, if that produces overall better code.
488 Optional now, so people can test it. */
490 #ifdef DEFAULT_CALLER_SAVES
491 int flag_caller_saves
= 1;
493 int flag_caller_saves
= 0;
496 /* Nonzero if structures and unions should be returned in memory.
498 This should only be defined if compatibility with another compiler or
499 with an ABI is needed, because it results in slower code. */
501 #ifndef DEFAULT_PCC_STRUCT_RETURN
502 #define DEFAULT_PCC_STRUCT_RETURN 1
505 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
507 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
509 /* Nonzero for -fforce-mem: load memory value into a register
510 before arithmetic on it. This makes better cse but slower compilation. */
512 int flag_force_mem
= 0;
514 /* Nonzero for -fforce-addr: load memory address into a register before
515 reference to memory. This makes better cse but slower compilation. */
517 int flag_force_addr
= 0;
519 /* Nonzero for -fdefer-pop: don't pop args after each function call;
520 instead save them up to pop many calls' args with one insns. */
522 int flag_defer_pop
= 0;
524 /* Nonzero for -ffloat-store: don't allocate floats and doubles
525 in extended-precision registers. */
527 int flag_float_store
= 0;
529 /* Nonzero for -fcse-follow-jumps:
530 have cse follow jumps to do a more extensive job. */
532 int flag_cse_follow_jumps
;
534 /* Nonzero for -fcse-skip-blocks:
535 have cse follow a branch around a block. */
536 int flag_cse_skip_blocks
;
538 /* Nonzero for -fexpensive-optimizations:
539 perform miscellaneous relatively-expensive optimizations. */
540 int flag_expensive_optimizations
;
542 /* Nonzero for -fthread-jumps:
543 have jump optimize output of loop. */
545 int flag_thread_jumps
;
547 /* Nonzero enables strength-reduction in loop.c. */
549 int flag_strength_reduce
= 0;
551 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
552 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
553 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
556 int flag_unroll_loops
;
558 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
559 This is generally not a win. */
561 int flag_unroll_all_loops
;
563 /* Nonzero forces all invariant computations in loops to be moved
566 int flag_move_all_movables
= 0;
568 /* Nonzero forces all general induction variables in loops to be
571 int flag_reduce_all_givs
= 0;
573 /* Nonzero to perform full register move optimization passes. This is the
576 int flag_regmove
= 0;
578 /* Nonzero for -fwritable-strings:
579 store string constants in data segment and don't uniquize them. */
581 int flag_writable_strings
= 0;
583 /* Nonzero means don't put addresses of constant functions in registers.
584 Used for compiling the Unix kernel, where strange substitutions are
585 done on the assembly output. */
587 int flag_no_function_cse
= 0;
589 /* Nonzero for -fomit-frame-pointer:
590 don't make a frame pointer in simple functions that don't require one. */
592 int flag_omit_frame_pointer
= 0;
594 /* Nonzero means place each function into its own section on those platforms
595 which support arbitrary section names and unlimited numbers of sections. */
597 int flag_function_sections
= 0;
599 /* ... and similar for data. */
601 int flag_data_sections
= 0;
603 /* Nonzero to inhibit use of define_optimization peephole opts. */
605 int flag_no_peephole
= 0;
607 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
609 int flag_optimize_sibling_calls
= 0;
611 /* Nonzero means the front end generally wants `errno' maintained by math
612 operations, like built-in SQRT. */
614 int flag_errno_math
= 1;
616 /* Nonzero means that unsafe floating-point math optimizations are allowed
617 for the sake of speed. IEEE compliance is not guaranteed, and operations
618 are allowed to assume that their arguments and results are "normal"
619 (e.g., nonnegative for SQRT). */
621 int flag_unsafe_math_optimizations
= 0;
623 /* Zero means that floating-point math operations cannot generate a
624 (user-visible) trap. This is the case, for example, in nonstop
625 IEEE 754 arithmetic. */
627 int flag_trapping_math
= 1;
629 /* 0 means straightforward implementation of complex divide acceptable.
630 1 means wide ranges of inputs must work for complex divide.
631 2 means C99-like requirements for complex divide (not yet implemented). */
633 int flag_complex_divide_method
= 0;
635 /* Nonzero means all references through pointers are volatile. */
639 /* Nonzero means treat all global and extern variables as volatile. */
641 int flag_volatile_global
;
643 /* Nonzero means treat all static variables as volatile. */
645 int flag_volatile_static
;
647 /* Nonzero means just do syntax checking; don't output anything. */
649 int flag_syntax_only
= 0;
651 /* Nonzero means perform global cse. */
653 static int flag_gcse
;
655 /* Nonzero means to use global dataflow analysis to eliminate
656 useless null pointer tests. */
658 static int flag_delete_null_pointer_checks
;
660 /* Nonzero means to do the enhanced load motion during gcse, which trys
661 to hoist loads by not killing them when a store to the same location
664 int flag_gcse_lm
= 1;
666 /* Nonzero means to perform store motion after gcse, which will try to
667 move stores closer to the exit block. Its not very effective without
670 int flag_gcse_sm
= 1;
672 /* Nonzero means to rerun cse after loop optimization. This increases
673 compilation time about 20% and picks up a few more common expressions. */
675 static int flag_rerun_cse_after_loop
;
677 /* Nonzero means to run loop optimizations twice. */
679 int flag_rerun_loop_opt
;
681 /* Nonzero for -finline-functions: ok to inline functions that look like
682 good inline candidates. */
684 int flag_inline_functions
;
686 /* Nonzero for -fkeep-inline-functions: even if we make a function
687 go inline everywhere, keep its definition around for debugging
690 int flag_keep_inline_functions
;
692 /* Nonzero means that functions will not be inlined. */
696 /* Nonzero means that we should emit static const variables
697 regardless of whether or not optimization is turned on. */
699 int flag_keep_static_consts
= 1;
701 /* Nonzero means we should be saving declaration info into a .X file. */
703 int flag_gen_aux_info
= 0;
705 /* Specified name of aux-info file. */
707 static char *aux_info_file_name
;
709 /* Nonzero means make the text shared if supported. */
711 int flag_shared_data
;
713 /* Nonzero means schedule into delayed branch slots if supported. */
715 int flag_delayed_branch
;
717 /* Nonzero if we are compiling pure (sharable) code.
718 Value is 1 if we are doing reasonable (i.e. simple
719 offset into offset table) pic. Value is 2 if we can
720 only perform register offsets. */
724 /* Nonzero means generate extra code for exception handling and enable
725 exception handling. */
729 /* Nonzero means generate frame unwind info table when supported. */
731 int flag_unwind_tables
= 0;
733 /* Nonzero means don't place uninitialized global data in common storage
738 /* Nonzero means pretend it is OK to examine bits of target floats,
739 even if that isn't true. The resulting code will have incorrect constants,
740 but the same series of instructions that the native compiler would make. */
742 int flag_pretend_float
;
744 /* Nonzero means change certain warnings into errors.
745 Usually these are warnings about failure to conform to some standard. */
747 int flag_pedantic_errors
= 0;
749 /* flag_schedule_insns means schedule insns within basic blocks (before
751 flag_schedule_insns_after_reload means schedule insns after
754 int flag_schedule_insns
= 0;
755 int flag_schedule_insns_after_reload
= 0;
757 /* The following flags have effect only for scheduling before register
760 flag_schedule_interblock means schedule insns accross basic blocks.
761 flag_schedule_speculative means allow speculative motion of non-load insns.
762 flag_schedule_speculative_load means allow speculative motion of some
764 flag_schedule_speculative_load_dangerous allows speculative motion of more
767 int flag_schedule_interblock
= 1;
768 int flag_schedule_speculative
= 1;
769 int flag_schedule_speculative_load
= 0;
770 int flag_schedule_speculative_load_dangerous
= 0;
772 int flag_single_precision_constant
;
774 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
775 by a cheaper branch on a count register. */
776 int flag_branch_on_count_reg
= 1;
778 /* -finhibit-size-directive inhibits output of .size for ELF.
779 This is used only for compiling crtstuff.c,
780 and it may be extended to other effects
781 needed for crtstuff.c on other systems. */
782 int flag_inhibit_size_directive
= 0;
784 /* -fverbose-asm causes extra commentary information to be produced in
785 the generated assembly code (to make it more readable). This option
786 is generally only of use to those who actually need to read the
787 generated assembly code (perhaps while debugging the compiler itself).
788 -fno-verbose-asm, the default, causes the extra information
789 to be omitted and is useful when comparing two assembler files. */
791 int flag_verbose_asm
= 0;
793 /* -dA causes debug commentary information to be produced in
794 the generated assembly code (to make it more readable). This option
795 is generally only of use to those who actually need to read the
796 generated assembly code (perhaps while debugging the compiler itself).
797 Currently, this switch is only used by dwarfout.c; however, it is intended
798 to be a catchall for printing debug information in the assembler file. */
800 int flag_debug_asm
= 0;
802 /* -dP causes the rtl to be emitted as a comment in assembly. */
804 int flag_dump_rtl_in_asm
= 0;
806 /* -fgnu-linker specifies use of the GNU linker for initializations.
807 (Or, more generally, a linker that handles initializations.)
808 -fno-gnu-linker says that collect2 will be used. */
810 int flag_gnu_linker
= 0;
812 int flag_gnu_linker
= 1;
818 /* Enable ssa conditional constant propagation. */
819 int flag_ssa_ccp
= 0;
821 /* Enable ssa aggressive dead code elimination. */
822 int flag_ssa_dce
= 0;
824 /* Tag all structures with __attribute__(packed). */
825 int flag_pack_struct
= 0;
827 /* Emit code to check for stack overflow; also may cause large objects
828 to be allocated dynamically. */
829 int flag_stack_check
;
831 /* When non-NULL, indicates that whenever space is allocated on the
832 stack, the resulting stack pointer must not pass this
833 address---that is, for stacks that grow downward, the stack pointer
834 must always be greater than or equal to this address; for stacks
835 that grow upward, the stack pointer must be less than this address.
836 At present, the rtx may be either a REG or a SYMBOL_REF, although
837 the support provided depends on the backend. */
840 /* -fcheck-memory-usage causes extra code to be generated in order to check
841 memory accesses. This is used by a detector of bad memory accesses such
843 int flag_check_memory_usage
= 0;
845 /* -fprefix-function-name causes function name to be prefixed. This
846 can be used with -fcheck-memory-usage to isolate code compiled with
847 -fcheck-memory-usage. */
848 int flag_prefix_function_name
= 0;
850 /* 0 if pointer arguments may alias each other. True in C.
851 1 if pointer arguments may not alias each other but may alias
853 2 if pointer arguments may not alias each other and may not
854 alias global variables. True in Fortran.
855 This defaults to 0 for C. */
856 int flag_argument_noalias
= 0;
858 /* Nonzero if we should do (language-dependent) alias analysis.
859 Typically, this analysis will assume that expressions of certain
860 types do not alias expressions of certain other types. Only used
861 if alias analysis (in general) is enabled. */
862 int flag_strict_aliasing
= 0;
864 /* Instrument functions with calls at entry and exit, for profiling. */
865 int flag_instrument_function_entry_exit
= 0;
867 /* Nonzero means ignore `#ident' directives. 0 means handle them.
868 On SVR4 targets, it also controls whether or not to emit a
869 string identifying the compiler. */
871 int flag_no_ident
= 0;
873 /* This will perform a peephole pass before sched2. */
874 int flag_peephole2
= 0;
876 /* This will try to guess branch probabilities. */
877 int flag_guess_branch_prob
= 0;
879 /* -fbounded-pointers causes gcc to compile pointers as composite
880 objects occupying three words: the pointer value, the base address
881 of the referent object, and the address immediately beyond the end
882 of the referent object. The base and extent allow us to perform
883 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
884 int flag_bounded_pointers
= 0;
886 /* -fcheck-bounds causes gcc to generate array bounds checks.
887 For C, C++: defaults to value of flag_bounded_pointers.
888 For ObjC: defaults to off.
889 For Java: defaults to on.
890 For Fortran: defaults to off.
891 For CHILL: defaults to off. */
892 int flag_bounds_check
= 0;
894 /* If one, renumber instruction UIDs to reduce the number of
895 unused UIDs if there are a lot of instructions. If greater than
896 one, unconditionally renumber instruction UIDs. */
897 int flag_renumber_insns
= 1;
899 /* Values of the -falign-* flags: how much to align labels in code.
900 0 means `use default', 1 means `don't align'.
901 For each variable, there is an _log variant which is the power
902 of two not less than the variable, for .align output. */
909 int align_labels_log
;
911 int align_functions_log
;
913 /* Table of supported debugging formats. */
917 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
918 constant expression, we use NO_DEBUG in its place. */
919 enum debug_info_type debug_type
;
920 int use_extensions_p
;
921 const char *description
;
925 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
926 N_("Generate debugging info in default format") },
927 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
928 #ifdef DBX_DEBUGGING_INFO
929 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
930 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
932 #ifdef DWARF_DEBUGGING_INFO
933 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
934 { "dwarf+", DWARF_DEBUG
, 1,
935 N_("Generate extended DWARF-1 format debug info") },
937 #ifdef DWARF2_DEBUGGING_INFO
938 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
940 #ifdef XCOFF_DEBUGGING_INFO
941 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
942 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
944 #ifdef SDB_DEBUGGING_INFO
945 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
955 const char *description
;
957 lang_independent_options
;
961 /* Add or remove a leading underscore from user symbols. */
962 int flag_leading_underscore
= -1;
964 /* The user symbol prefix after having resolved same. */
965 const char *user_label_prefix
;
967 static const param_info lang_independent_params
[] = {
968 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
969 { OPTION, DEFAULT, HELP },
970 #include "params.def"
975 /* A default for same. */
976 #ifndef USER_LABEL_PREFIX
977 #define USER_LABEL_PREFIX ""
980 /* Table of language-independent -f options.
981 STRING is the option name. VARIABLE is the address of the variable.
982 ON_VALUE is the value to store in VARIABLE
983 if `-fSTRING' is seen as an option.
984 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
986 lang_independent_options f_options
[] =
988 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
989 N_("Perform DWARF2 duplicate elimination") },
990 {"float-store", &flag_float_store
, 1,
991 N_("Do not store floats in registers") },
992 {"volatile", &flag_volatile
, 1,
993 N_("Consider all mem refs through pointers as volatile") },
994 {"volatile-global", &flag_volatile_global
, 1,
995 N_("Consider all mem refs to global data to be volatile") },
996 {"volatile-static", &flag_volatile_static
, 1,
997 N_("Consider all mem refs to static data to be volatile") },
998 {"defer-pop", &flag_defer_pop
, 1,
999 N_("Defer popping functions args from stack until later") },
1000 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1001 N_("When possible do not generate stack frames") },
1002 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1003 N_("Optimize sibling and tail recursive calls") },
1004 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1005 N_("When running CSE, follow jumps to their targets") },
1006 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1007 N_("When running CSE, follow conditional jumps") },
1008 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1009 N_("Perform a number of minor, expensive optimisations") },
1010 {"thread-jumps", &flag_thread_jumps
, 1,
1011 N_("Perform jump threading optimisations") },
1012 {"strength-reduce", &flag_strength_reduce
, 1,
1013 N_("Perform strength reduction optimisations") },
1014 {"unroll-loops", &flag_unroll_loops
, 1,
1015 N_("Perform loop unrolling when iteration count is known") },
1016 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1017 N_("Perform loop unrolling for all loops") },
1018 {"move-all-movables", &flag_move_all_movables
, 1,
1019 N_("Force all loop invariant computations out of loops") },
1020 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1021 N_("Strength reduce all loop general induction variables") },
1022 {"writable-strings", &flag_writable_strings
, 1,
1023 N_("Store strings in writable data section") },
1024 {"peephole", &flag_no_peephole
, 0,
1025 N_("Enable machine specific peephole optimisations") },
1026 {"force-mem", &flag_force_mem
, 1,
1027 N_("Copy memory operands into registers before using") },
1028 {"force-addr", &flag_force_addr
, 1,
1029 N_("Copy memory address constants into regs before using") },
1030 {"function-cse", &flag_no_function_cse
, 0,
1031 N_("Allow function addresses to be held in registers") },
1032 {"inline-functions", &flag_inline_functions
, 1,
1033 N_("Integrate simple functions into their callers") },
1034 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1035 N_("Generate code for funcs even if they are fully inlined") },
1036 {"inline", &flag_no_inline
, 0,
1037 N_("Pay attention to the 'inline' keyword") },
1038 {"keep-static-consts", &flag_keep_static_consts
, 1,
1039 N_("Emit static const variables even if they are not used") },
1040 {"syntax-only", &flag_syntax_only
, 1,
1041 N_("Check for syntax errors, then stop") },
1042 {"shared-data", &flag_shared_data
, 1,
1043 N_("Mark data as shared rather than private") },
1044 {"caller-saves", &flag_caller_saves
, 1,
1045 N_("Enable saving registers around function calls") },
1046 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1047 N_("Return 'short' aggregates in memory, not registers") },
1048 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1049 N_("Return 'short' aggregates in registers") },
1050 {"delayed-branch", &flag_delayed_branch
, 1,
1051 N_("Attempt to fill delay slots of branch instructions") },
1052 {"gcse", &flag_gcse
, 1,
1053 N_("Perform the global common subexpression elimination") },
1054 {"gcse-lm", &flag_gcse_lm
, 1,
1055 N_("Perform enhanced load motion during global subexpression elimination") },
1056 {"gcse-sm", &flag_gcse_sm
, 1,
1057 N_("Perform store motion after global subexpression elimination") },
1058 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1059 N_("Run CSE pass after loop optimisations") },
1060 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1061 N_("Run the loop optimiser twice") },
1062 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1063 N_("Delete useless null pointer checks") },
1064 {"pretend-float", &flag_pretend_float
, 1,
1065 N_("Pretend that host and target use the same FP format") },
1066 {"schedule-insns", &flag_schedule_insns
, 1,
1067 N_("Reschedule instructions before register allocation") },
1068 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1069 N_("Reschedule instructions after register allocation") },
1070 {"sched-interblock",&flag_schedule_interblock
, 1,
1071 N_("Enable scheduling across basic blocks") },
1072 {"sched-spec",&flag_schedule_speculative
, 1,
1073 N_("Allow speculative motion of non-loads") },
1074 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1075 N_("Allow speculative motion of some loads") },
1076 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1077 N_("Allow speculative motion of more loads") },
1078 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1079 N_("Replace add,compare,branch with branch on count reg") },
1080 {"pic", &flag_pic
, 1,
1081 N_("Generate position independent code, if possible") },
1082 {"PIC", &flag_pic
, 2, ""},
1083 {"exceptions", &flag_exceptions
, 1,
1084 N_("Enable exception handling") },
1085 {"unwind-tables", &flag_unwind_tables
, 1,
1086 N_("Just generate unwind tables for exception handling") },
1087 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1088 N_("Support synchronous non-call exceptions") },
1089 {"profile-arcs", &profile_arc_flag
, 1,
1090 N_("Insert arc based program profiling code") },
1091 {"test-coverage", &flag_test_coverage
, 1,
1092 N_("Create data files needed by gcov") },
1093 {"branch-probabilities", &flag_branch_probabilities
, 1,
1094 N_("Use profiling information for branch probabilities") },
1095 {"reorder-blocks", &flag_reorder_blocks
, 1,
1096 N_("Reorder basic blocks to improve code placement") },
1097 {"rename-registers", &flag_rename_registers
, 1,
1098 N_("Do the register renaming optimization pass") },
1099 {"common", &flag_no_common
, 0,
1100 N_("Do not put unitialised globals in the common section") },
1101 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1102 N_("Do not generate .size directives") },
1103 {"function-sections", &flag_function_sections
, 1,
1104 N_("place each function into its own section") },
1105 {"data-sections", &flag_data_sections
, 1,
1106 N_("place data items into their own section") },
1107 {"verbose-asm", &flag_verbose_asm
, 1,
1108 N_("Add extra commentry to assembler output") },
1109 {"gnu-linker", &flag_gnu_linker
, 1,
1110 N_("Output GNU ld formatted global initialisers") },
1111 {"regmove", &flag_regmove
, 1,
1112 N_("Enables a register move optimisation") },
1113 {"optimize-register-move", &flag_regmove
, 1,
1114 N_("Do the full regmove optimization pass") },
1115 {"pack-struct", &flag_pack_struct
, 1,
1116 N_("Pack structure members together without holes") },
1117 {"stack-check", &flag_stack_check
, 1,
1118 N_("Insert stack checking code into the program") },
1119 {"argument-alias", &flag_argument_noalias
, 0,
1120 N_("Specify that arguments may alias each other & globals") },
1121 {"argument-noalias", &flag_argument_noalias
, 1,
1122 N_("Assume arguments may alias globals but not each other") },
1123 {"argument-noalias-global", &flag_argument_noalias
, 2,
1124 N_("Assume arguments do not alias each other or globals") },
1125 {"strict-aliasing", &flag_strict_aliasing
, 1,
1126 N_("Assume strict aliasing rules apply") },
1127 {"align-loops", &align_loops
, 0,
1128 N_("Align the start of loops") },
1129 {"align-jumps", &align_jumps
, 0,
1130 N_("Align labels which are only reached by jumping") },
1131 {"align-labels", &align_labels
, 0,
1132 N_("Align all labels") },
1133 {"align-functions", &align_functions
, 0,
1134 N_("Align the start of functions") },
1135 {"check-memory-usage", &flag_check_memory_usage
, 1,
1136 N_("Generate code to check every memory access") },
1137 {"prefix-function-name", &flag_prefix_function_name
, 1,
1138 N_("Add a prefix to all function names") },
1139 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1140 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1141 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1142 N_("Instrument function entry/exit with profiling calls") },
1143 {"ssa", &flag_ssa
, 1,
1144 N_("Enable SSA optimizations") },
1145 {"ssa-ccp", &flag_ssa_ccp
, 1,
1146 N_("Enable SSA conditonal constant propagation") },
1147 {"ssa-dce", &flag_ssa_dce
, 1,
1148 N_("Enable aggressive SSA dead code elimination") },
1149 {"leading-underscore", &flag_leading_underscore
, 1,
1150 N_("External symbols have a leading underscore") },
1151 {"ident", &flag_no_ident
, 0,
1152 N_("Process #ident directives") },
1153 { "peephole2", &flag_peephole2
, 1,
1154 N_("Enables an rtl peephole pass run before sched2") },
1155 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1156 N_("Enables guessing of branch probabilities") },
1157 {"math-errno", &flag_errno_math
, 1,
1158 N_("Set errno after built-in math functions") },
1159 {"trapping-math", &flag_trapping_math
, 1,
1160 N_("Floating-point operations can trap") },
1161 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1162 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1163 {"bounded-pointers", &flag_bounded_pointers
, 1,
1164 N_("Compile pointers as triples: value, base & end") },
1165 {"bounds-check", &flag_bounds_check
, 1,
1166 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1167 {"single-precision-constant", &flag_single_precision_constant
, 1,
1168 N_("Convert floating point constant to single precision constant") },
1169 {"time-report", &time_report
, 1,
1170 N_("Report time taken by each compiler pass at end of run") },
1171 {"mem-report", &mem_report
, 1,
1172 N_("Report on permanent memory allocation at end of run") },
1173 { "trapv", &flag_trapv
, 1,
1174 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1177 /* Table of language-specific options. */
1179 static struct lang_opt
1182 const char *description
;
1184 documented_lang_options
[] =
1186 /* In order not to overload the --help output, the convention
1187 used here is to only describe those options which are not
1188 enabled by default. */
1191 N_("Compile just for ISO C89") },
1192 { "-fallow-single-precision",
1193 N_("Do not promote floats to double if using -traditional") },
1195 N_("Determine language standard") },
1197 { "-fsigned-bitfields", "" },
1198 { "-funsigned-bitfields",
1199 N_("Make bitfields by unsigned by default") },
1200 { "-fno-signed-bitfields", "" },
1201 { "-fno-unsigned-bitfields","" },
1203 N_("Make 'char' be signed by default") },
1204 { "-funsigned-char",
1205 N_("Make 'char' be unsigned by default") },
1206 { "-fno-signed-char", "" },
1207 { "-fno-unsigned-char", "" },
1209 { "-ftraditional", "" },
1211 N_("Attempt to support traditional K&R style C") },
1212 { "-fnotraditional", "" },
1213 { "-fno-traditional", "" },
1217 N_("Do not recognise the 'asm' keyword") },
1218 { "-fbuiltin", "" },
1220 N_("Do not recognise any built in functions") },
1222 N_("Assume normal C execution environment") },
1223 { "-fno-hosted", "" },
1225 N_("Assume that standard libraries & main might not exist") },
1226 { "-fno-freestanding", "" },
1227 { "-fcond-mismatch",
1228 N_("Allow different types as args of ? operator") },
1229 { "-fno-cond-mismatch", "" },
1230 { "-fdollars-in-identifiers",
1231 N_("Allow the use of $ inside identifiers") },
1232 { "-fno-dollars-in-identifiers", "" },
1233 { "-fpreprocessed", "" },
1234 { "-fno-preprocessed", "" },
1236 N_("Use the same size for double as for float") },
1237 { "-fno-short-double", "" },
1239 N_("Use the smallest fitting integer to hold enums") },
1240 { "-fno-short-enums", "" },
1242 N_("Override the underlying type for wchar_t to `unsigned short'") },
1243 { "-fno-short-wchar", "" },
1246 N_("Enable most warning messages") },
1247 { "-Wbad-function-cast",
1248 N_("Warn about casting functions to incompatible types") },
1249 { "-Wno-bad-function-cast", "" },
1250 { "-Wno-missing-noreturn", "" },
1251 { "-Wmissing-format-attribute",
1252 N_("Warn about functions which might be candidates for format attributes") },
1253 { "-Wno-missing-format-attribute", "" },
1255 N_("Warn about casts which discard qualifiers") },
1256 { "-Wno-cast-qual", "" },
1257 { "-Wchar-subscripts",
1258 N_("Warn about subscripts whose type is 'char'") },
1259 { "-Wno-char-subscripts", "" },
1261 N_("Warn if nested comments are detected") },
1262 { "-Wno-comment", "" },
1264 N_("Warn if nested comments are detected") },
1265 { "-Wno-comments", "" },
1267 N_("Warn about possibly confusing type conversions") },
1268 { "-Wno-conversion", "" },
1270 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1271 { "-Wno-format", "" },
1272 { "-Wformat-y2k", "" },
1273 { "-Wno-format-y2k",
1274 N_("Don't warn about strftime formats yielding 2 digit years") },
1275 { "-Wformat-extra-args", "" },
1276 { "-Wno-format-extra-args",
1277 N_("Don't warn about too many arguments to format functions") },
1278 { "-Wformat-nonliteral",
1279 N_("Warn about non-string-literal format strings") },
1280 { "-Wno-format-nonliteral", "" },
1281 { "-Wformat-security",
1282 N_("Warn about possible security problems with format functions") },
1283 { "-Wno-format-security", "" },
1284 { "-Wimplicit-function-declaration",
1285 N_("Warn about implicit function declarations") },
1286 { "-Wno-implicit-function-declaration", "" },
1287 { "-Werror-implicit-function-declaration", "" },
1289 N_("Warn when a declaration does not specify a type") },
1290 { "-Wno-implicit-int", "" },
1291 { "-Wimplicit", "" },
1292 { "-Wno-implicit", "" },
1294 N_("Warn about the use of the #import directive") },
1295 { "-Wno-import", "" },
1296 { "-Wlong-long","" },
1298 N_("Do not warn about using 'long long' when -pedantic") },
1300 N_("Warn about suspicious declarations of main") },
1301 { "-Wno-main", "" },
1302 { "-Wmissing-braces",
1303 N_("Warn about possibly missing braces around initialisers") },
1304 { "-Wno-missing-braces", "" },
1305 { "-Wmissing-declarations",
1306 N_("Warn about global funcs without previous declarations") },
1307 { "-Wno-missing-declarations", "" },
1308 { "-Wmissing-prototypes",
1309 N_("Warn about global funcs without prototypes") },
1310 { "-Wno-missing-prototypes", "" },
1312 N_("Warn about use of multicharacter literals") },
1313 { "-Wno-multichar", "" },
1314 { "-Wnested-externs",
1315 N_("Warn about externs not at file scope level") },
1316 { "-Wno-nested-externs", "" },
1318 N_("Warn about possible missing parentheses") },
1319 { "-Wno-parentheses", "" },
1320 { "-Wsequence-point",
1321 N_("Warn about possible violations of sequence point rules") },
1322 { "-Wno-sequence-point", "" },
1323 { "-Wpointer-arith",
1324 N_("Warn about function pointer arithmetic") },
1325 { "-Wno-pointer-arith", "" },
1326 { "-Wredundant-decls",
1327 N_("Warn about multiple declarations of the same object") },
1328 { "-Wno-redundant-decls", "" },
1330 N_("Warn about signed/unsigned comparisons") },
1331 { "-Wno-sign-compare", "" },
1333 N_("Warn about testing equality of floating point numbers") },
1334 { "-Wno-float-equal", "" },
1335 { "-Wunknown-pragmas",
1336 N_("Warn about unrecognized pragmas") },
1337 { "-Wno-unknown-pragmas", "" },
1338 { "-Wstrict-prototypes",
1339 N_("Warn about non-prototyped function decls") },
1340 { "-Wno-strict-prototypes", "" },
1342 N_("Warn about constructs whose meaning change in ISO C") },
1343 { "-Wno-traditional", "" },
1345 N_("Warn when trigraphs are encountered") },
1346 { "-Wno-trigraphs", "" },
1348 { "-Wno-undef", "" },
1349 { "-Wwrite-strings",
1350 N_("Mark strings as 'const char *'") },
1351 { "-Wno-write-strings", "" },
1353 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1355 #include "options.h"
1359 /* Here is a table, controlled by the tm.h file, listing each -m switch
1360 and which bits in `target_switches' it should set or clear.
1361 If VALUE is positive, it is bits to set.
1362 If VALUE is negative, -VALUE is bits to clear.
1363 (The sign bit is not used so there is no confusion.) */
1369 const char *description
;
1371 target_switches
[] = TARGET_SWITCHES
;
1373 /* This table is similar, but allows the switch to have a value. */
1375 #ifdef TARGET_OPTIONS
1379 const char **variable
;
1380 const char *description
;
1382 target_options
[] = TARGET_OPTIONS
;
1385 /* Options controlling warnings. */
1387 /* Don't print warning messages. -w. */
1389 int inhibit_warnings
= 0;
1391 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1393 int warn_system_headers
= 0;
1395 /* Print various extra warnings. -W. */
1397 int extra_warnings
= 0;
1399 /* Treat warnings as errors. -Werror. */
1401 int warnings_are_errors
= 0;
1403 /* Nonzero to warn about unused variables, functions et.al. */
1405 int warn_unused_function
;
1406 int warn_unused_label
;
1407 int warn_unused_parameter
;
1408 int warn_unused_variable
;
1409 int warn_unused_value
;
1412 set_Wunused (setting
)
1415 warn_unused_function
= setting
;
1416 warn_unused_label
= setting
;
1417 /* Unused function parameter warnings are reported when either ``-W
1418 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1419 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1421 warn_unused_parameter
= 0;
1422 else if (!warn_unused_parameter
)
1423 warn_unused_parameter
= -1;
1424 warn_unused_variable
= setting
;
1425 warn_unused_value
= setting
;
1428 /* Nonzero to warn about code which is never reached. */
1430 int warn_notreached
;
1432 /* Nonzero to warn about variables used before they are initialized. */
1434 int warn_uninitialized
;
1436 /* Nonzero means warn about all declarations which shadow others. */
1440 /* Warn if a switch on an enum fails to have a case for every enum value. */
1444 /* Nonzero means warn about function definitions that default the return type
1445 or that use a null return and have a return-type other than void. */
1447 int warn_return_type
;
1449 /* Nonzero means warn about pointer casts that increase the required
1450 alignment of the target type (and might therefore lead to a crash
1451 due to a misaligned access). */
1453 int warn_cast_align
;
1455 /* Nonzero means warn about any objects definitions whose size is larger
1456 than N bytes. Also want about function definitions whose returned
1457 values are larger than N bytes. The value N is in `larger_than_size'. */
1459 int warn_larger_than
;
1460 HOST_WIDE_INT larger_than_size
;
1462 /* Nonzero means warn if inline function is too large. */
1466 /* Warn if a function returns an aggregate,
1467 since there are often incompatible calling conventions for doing this. */
1469 int warn_aggregate_return
;
1471 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1475 /* Warn when gcc pads a structure to an alignment boundary. */
1479 /* Warn when an optimization pass is disabled. */
1481 int warn_disabled_optimization
;
1483 /* Warn about functions which might be candidates for attribute noreturn. */
1485 int warn_missing_noreturn
;
1487 /* Likewise for -W. */
1489 lang_independent_options W_options
[] =
1491 {"unused-function", &warn_unused_function
, 1,
1492 N_("Warn when a function is unused") },
1493 {"unused-label", &warn_unused_label
, 1,
1494 N_("Warn when a label is unused") },
1495 {"unused-parameter", &warn_unused_parameter
, 1,
1496 N_("Warn when a function parameter is unused") },
1497 {"unused-variable", &warn_unused_variable
, 1,
1498 N_("Warn when a variable is unused") },
1499 {"unused-value", &warn_unused_value
, 1,
1500 N_("Warn when an expression value is unused") },
1501 {"system-headers", &warn_system_headers
, 1,
1502 N_("Do not suppress warnings from system headers") },
1503 {"error", &warnings_are_errors
, 1,
1504 N_("Treat all warnings as errors") },
1505 {"shadow", &warn_shadow
, 1,
1506 N_("Warn when one local variable shadows another") },
1507 {"switch", &warn_switch
, 1,
1508 N_("Warn about enumerated switches missing a specific case") },
1509 {"aggregate-return", &warn_aggregate_return
, 1,
1510 N_("Warn about returning structures, unions or arrays") },
1511 {"cast-align", &warn_cast_align
, 1,
1512 N_("Warn about pointer casts which increase alignment") },
1513 {"unreachable-code", &warn_notreached
, 1,
1514 N_("Warn about code that will never be executed") },
1515 {"uninitialized", &warn_uninitialized
, 1,
1516 N_("Warn about unitialized automatic variables") },
1517 {"inline", &warn_inline
, 1,
1518 N_("Warn when an inlined function cannot be inlined") },
1519 {"packed", &warn_packed
, 1,
1520 N_("Warn when the packed attribute has no effect on struct layout") },
1521 {"padded", &warn_padded
, 1,
1522 N_("Warn when padding is required to align struct members") },
1523 {"disabled-optimization", &warn_disabled_optimization
, 1,
1524 N_("Warn when an optimization pass is disabled") },
1525 {"missing-noreturn", &warn_missing_noreturn
, 1,
1526 N_("Warn about functions which might be candidates for attribute noreturn") }
1529 /* The following routines are useful in setting all the flags that
1530 -ffast-math and -fno-fast-math imply. */
1533 set_fast_math_flags ()
1535 flag_trapping_math
= 0;
1536 flag_unsafe_math_optimizations
= 1;
1537 flag_errno_math
= 0;
1541 set_no_fast_math_flags ()
1543 flag_trapping_math
= 1;
1544 flag_unsafe_math_optimizations
= 0;
1545 flag_errno_math
= 1;
1549 /* Output files for assembler code (real compiler output)
1550 and debugging dumps. */
1553 FILE *aux_info_file
;
1554 FILE *rtl_dump_file
= NULL
;
1556 /* Decode the string P as an integral parameter.
1557 If the string is indeed an integer return its numeric value else
1558 issue an Invalid Option error for the option PNAME and return DEFVAL.
1559 If PNAME is zero just return DEFVAL, do not call error. */
1562 read_integral_parameter (p
, pname
, defval
)
1567 const char *endp
= p
;
1571 if (*endp
>= '0' && *endp
<= '9')
1580 error ("Invalid option `%s'", pname
);
1588 /* This is the default decl_printable_name function. */
1591 decl_name (decl
, verbosity
)
1593 int verbosity ATTRIBUTE_UNUSED
;
1595 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1599 /* This calls abort and is used to avoid problems when abort if a macro.
1600 It is used when we need to pass the address of abort. */
1608 /* When `malloc.c' is compiled with `rcheck' defined,
1609 it calls this function to report clobberage. */
1613 const char *s ATTRIBUTE_UNUSED
;
1618 /* Return the logarithm of X, base 2, considering X unsigned,
1619 if X is a power of 2. Otherwise, returns -1.
1621 This should be used via the `exact_log2' macro. */
1625 register unsigned HOST_WIDE_INT x
;
1627 register int log
= 0;
1628 /* Test for 0 or a power of 2. */
1629 if (x
== 0 || x
!= (x
& -x
))
1631 while ((x
>>= 1) != 0)
1636 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1637 If X is 0, return -1.
1639 This should be used via the floor_log2 macro. */
1643 register unsigned HOST_WIDE_INT x
;
1645 register int log
= -1;
1652 static int float_handler_set
;
1654 jmp_buf float_handler
;
1656 /* Signals actually come here. */
1659 float_signal (signo
)
1660 /* If this is missing, some compilers complain. */
1661 int signo ATTRIBUTE_UNUSED
;
1663 if (float_handled
== 0)
1664 crash_signal (signo
);
1667 /* On System-V derived systems, we must reinstall the signal handler.
1668 This is harmless on BSD-derived systems. */
1669 signal (SIGFPE
, float_signal
);
1670 longjmp (float_handler
, 1);
1673 /* Specify where to longjmp to when a floating arithmetic error happens.
1674 If HANDLER is 0, it means don't handle the errors any more. */
1677 set_float_handler (handler
)
1680 float_handled
= (handler
!= 0);
1682 memcpy (float_handler
, handler
, sizeof (float_handler
));
1684 if (float_handled
&& ! float_handler_set
)
1686 signal (SIGFPE
, float_signal
);
1687 float_handler_set
= 1;
1691 /* This is a wrapper function for code which might elicit an
1692 arithmetic exception. That code should be passed in as a function
1693 pointer FN, and one argument DATA. DATA is usually a struct which
1694 contains the real input and output for function FN. This function
1695 returns 0 (failure) if longjmp was called (i.e. an exception
1696 occured.) It returns 1 (success) otherwise. */
1699 do_float_handler (fn
, data
)
1700 void (*fn
) PARAMS ((PTR
));
1707 /* We got here via longjmp () caused by an exception in function
1709 set_float_handler (NULL
);
1713 set_float_handler (buf
);
1715 set_float_handler (NULL
);
1719 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1720 into ICE messages, which is much more user friendly. */
1723 crash_signal (signo
)
1726 internal_error ("Internal error: %s", strsignal (signo
));
1729 /* Strip off a legitimate source ending from the input string NAME of
1730 length LEN. Rather than having to know the names used by all of
1731 our front ends, we strip off an ending of a period followed by
1732 up to five characters. (Java uses ".class".) */
1735 strip_off_ending (name
, len
)
1740 for (i
= 2; i
< 6 && len
> i
; i
++)
1742 if (name
[len
- i
] == '.')
1744 name
[len
- i
] = '\0';
1750 /* Output a quoted string. */
1753 output_quoted_string (asm_file
, string
)
1757 #ifdef OUTPUT_QUOTED_STRING
1758 OUTPUT_QUOTED_STRING (asm_file
, string
);
1762 putc ('\"', asm_file
);
1763 while ((c
= *string
++) != 0)
1765 if (c
== '\"' || c
== '\\')
1766 putc ('\\', asm_file
);
1769 putc ('\"', asm_file
);
1773 /* Output a file name in the form wanted by System V. */
1776 output_file_directive (asm_file
, input_name
)
1778 const char *input_name
;
1780 int len
= strlen (input_name
);
1781 const char *na
= input_name
+ len
;
1783 /* NA gets INPUT_NAME sans directory names. */
1784 while (na
> input_name
)
1786 if (IS_DIR_SEPARATOR (na
[-1]))
1791 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1792 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1794 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1795 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1797 fprintf (asm_file
, "\t.file\t");
1798 output_quoted_string (asm_file
, na
);
1799 fputc ('\n', asm_file
);
1804 /* Routine to open a dump file. Return true if the dump file is enabled. */
1807 open_dump_file (index
, decl
)
1808 enum dump_file_index index
;
1812 const char *open_arg
;
1815 if (! dump_file
[index
].enabled
)
1818 timevar_push (TV_DUMP
);
1819 if (rtl_dump_file
!= NULL
)
1820 fclose (rtl_dump_file
);
1822 sprintf (seq
, ".%02d.", index
);
1824 if (! dump_file
[index
].initialized
)
1826 /* If we've not initialized the files, do so now. */
1827 if (graph_dump_format
!= no_graph
1828 && dump_file
[index
].graph_dump_p
)
1830 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1831 clean_graph_dump_file (dump_base_name
, dump_name
);
1834 dump_file
[index
].initialized
= 1;
1840 dump_name
= concat (dump_base_name
, seq
,
1841 dump_file
[index
].extension
, NULL
);
1843 rtl_dump_file
= fopen (dump_name
, open_arg
);
1844 if (rtl_dump_file
== NULL
)
1845 fatal_io_error ("can't open %s", dump_name
);
1850 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1851 decl_printable_name (decl
, 2));
1853 timevar_pop (TV_DUMP
);
1857 /* Routine to close a dump file. */
1860 close_dump_file (index
, func
, insns
)
1861 enum dump_file_index index
;
1862 void (*func
) PARAMS ((FILE *, rtx
));
1865 if (! rtl_dump_file
)
1868 timevar_push (TV_DUMP
);
1870 && graph_dump_format
!= no_graph
1871 && dump_file
[index
].graph_dump_p
)
1876 sprintf (seq
, ".%02d.", index
);
1877 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1878 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1883 func (rtl_dump_file
, insns
);
1885 fflush (rtl_dump_file
);
1886 fclose (rtl_dump_file
);
1888 rtl_dump_file
= NULL
;
1889 timevar_pop (TV_DUMP
);
1892 /* Do any final processing required for the declarations in VEC, of
1893 which there are LEN. We write out inline functions and variables
1894 that have been deferred until this point, but which are required.
1895 Returns non-zero if anything was put out. */
1898 wrapup_global_declarations (vec
, len
)
1905 int output_something
= 0;
1907 for (i
= 0; i
< len
; i
++)
1911 /* We're not deferring this any longer. */
1912 DECL_DEFER_OUTPUT (decl
) = 0;
1914 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1915 && incomplete_decl_finalize_hook
!= 0)
1916 (*incomplete_decl_finalize_hook
) (decl
);
1919 /* Now emit any global variables or functions that we have been
1920 putting off. We need to loop in case one of the things emitted
1921 here references another one which comes earlier in the list. */
1925 for (i
= 0; i
< len
; i
++)
1929 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1932 /* Don't write out static consts, unless we still need them.
1934 We also keep static consts if not optimizing (for debugging),
1935 unless the user specified -fno-keep-static-consts.
1936 ??? They might be better written into the debug information.
1937 This is possible when using DWARF.
1939 A language processor that wants static constants to be always
1940 written out (even if it is not used) is responsible for
1941 calling rest_of_decl_compilation itself. E.g. the C front-end
1942 calls rest_of_decl_compilation from finish_decl.
1943 One motivation for this is that is conventional in some
1944 environments to write things like:
1945 static const char rcsid[] = "... version string ...";
1946 intending to force the string to be in the executable.
1948 A language processor that would prefer to have unneeded
1949 static constants "optimized away" would just defer writing
1950 them out until here. E.g. C++ does this, because static
1951 constants are often defined in header files.
1953 ??? A tempting alternative (for both C and C++) would be
1954 to force a constant to be written if and only if it is
1955 defined in a main file, as opposed to an include file. */
1957 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1958 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1959 && !DECL_COMDAT (decl
))
1961 && flag_keep_static_consts
1962 && !DECL_ARTIFICIAL (decl
))
1963 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1966 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1969 if (TREE_CODE (decl
) == FUNCTION_DECL
1970 && DECL_INITIAL (decl
) != 0
1971 && DECL_SAVED_INSNS (decl
) != 0
1972 && (flag_keep_inline_functions
1973 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1974 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1977 output_inline_function (decl
);
1982 output_something
= 1;
1986 return output_something
;
1989 /* Issue appropriate warnings for the global declarations in VEC (of
1990 which there are LEN). Output debugging information for them. */
1993 check_global_declarations (vec
, len
)
2000 for (i
= 0; i
< len
; i
++)
2004 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2005 && ! TREE_ASM_WRITTEN (decl
))
2006 /* Cancel the RTL for this decl so that, if debugging info
2007 output for global variables is still to come,
2008 this one will be omitted. */
2009 SET_DECL_RTL (decl
, NULL_RTX
);
2011 /* Warn about any function
2012 declared static but not defined.
2013 We don't warn about variables,
2014 because many programs have static variables
2015 that exist only to get some text into the object file. */
2016 if (TREE_CODE (decl
) == FUNCTION_DECL
2017 && (warn_unused_function
2018 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2019 && DECL_INITIAL (decl
) == 0
2020 && DECL_EXTERNAL (decl
)
2021 && ! DECL_ARTIFICIAL (decl
)
2022 && ! TREE_PUBLIC (decl
))
2024 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2025 pedwarn_with_decl (decl
,
2026 "`%s' used but never defined");
2028 warning_with_decl (decl
,
2029 "`%s' declared `static' but never defined");
2030 /* This symbol is effectively an "extern" declaration now. */
2031 TREE_PUBLIC (decl
) = 1;
2032 assemble_external (decl
);
2035 /* Warn about static fns or vars defined but not used,
2036 but not about inline functions or static consts
2037 since defining those in header files is normal practice. */
2038 if (((warn_unused_function
2039 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2040 || (warn_unused_variable
2041 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2042 && ! DECL_IN_SYSTEM_HEADER (decl
)
2043 && ! DECL_EXTERNAL (decl
)
2044 && ! TREE_PUBLIC (decl
)
2045 && ! TREE_USED (decl
)
2046 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2047 /* The TREE_USED bit for file-scope decls
2048 is kept in the identifier, to handle multiple
2049 external decls in different scopes. */
2050 && ! TREE_USED (DECL_NAME (decl
)))
2051 warning_with_decl (decl
, "`%s' defined but not used");
2053 timevar_push (TV_SYMOUT
);
2054 (*debug_hooks
->global_decl
) (decl
);
2055 timevar_pop (TV_SYMOUT
);
2059 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2060 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2061 INPUT_FILENAME and LINENO accordingly. */
2064 push_srcloc (file
, line
)
2068 struct file_stack
*fs
;
2070 if (input_file_stack
)
2072 input_file_stack
->name
= input_filename
;
2073 input_file_stack
->line
= lineno
;
2076 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2077 fs
->name
= input_filename
= file
;
2078 fs
->line
= lineno
= line
;
2079 fs
->indent_level
= 0;
2080 fs
->next
= input_file_stack
;
2081 input_file_stack
= fs
;
2082 input_file_stack_tick
++;
2085 /* Pop the top entry off the stack of presently open source files.
2086 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2092 struct file_stack
*fs
;
2094 fs
= input_file_stack
;
2095 input_file_stack
= fs
->next
;
2097 input_file_stack_tick
++;
2098 /* The initial source file is never popped. */
2099 if (!input_file_stack
)
2101 input_filename
= input_file_stack
->name
;
2102 lineno
= input_file_stack
->line
;
2105 /* Compile an entire file of output from cpp, named NAME.
2106 Write a file of assembly output and various debugging dumps. */
2114 int name_specified
= name
!= 0;
2116 if (dump_base_name
== 0)
2117 dump_base_name
= name
? name
: "gccdump";
2122 /* Start timing total execution time. */
2125 timevar_start (TV_TOTAL
);
2127 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2128 because then the driver will have provided the name of a temporary
2129 file or bit bucket for us. */
2131 if (! name_specified
&& asm_file_name
== 0)
2132 asm_out_file
= stdout
;
2135 if (asm_file_name
== 0)
2137 int len
= strlen (dump_base_name
);
2138 char *dumpname
= (char *) xmalloc (len
+ 6);
2139 memcpy (dumpname
, dump_base_name
, len
+ 1);
2140 strip_off_ending (dumpname
, len
);
2141 strcat (dumpname
, ".s");
2142 asm_file_name
= dumpname
;
2144 if (!strcmp (asm_file_name
, "-"))
2145 asm_out_file
= stdout
;
2147 asm_out_file
= fopen (asm_file_name
, "w");
2148 if (asm_out_file
== 0)
2149 fatal_io_error ("can't open %s for writing", asm_file_name
);
2152 /* Initialize data in various passes. */
2155 name
= init_parse (name
);
2156 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2157 || debug_info_level
== DINFO_LEVEL_VERBOSE
2158 || flag_test_coverage
2159 || warn_notreached
);
2162 init_decl_processing ();
2168 init_function_once ();
2169 init_stor_layout_once ();
2170 init_varasm_once ();
2171 init_EXPR_INSN_LIST_cache ();
2173 /* The following initialization functions need to generate rtl, so
2174 provide a dummy function context for them. */
2175 init_dummy_function_start ();
2178 if (flag_caller_saves
)
2179 init_caller_save ();
2180 expand_dummy_function_end ();
2182 /* If auxiliary info generation is desired, open the output file.
2183 This goes in the same directory as the source file--unlike
2184 all the other output files. */
2185 if (flag_gen_aux_info
)
2187 aux_info_file
= fopen (aux_info_file_name
, "w");
2188 if (aux_info_file
== 0)
2189 fatal_io_error ("can't open %s", aux_info_file_name
);
2192 #ifdef IO_BUFFER_SIZE
2193 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2194 _IOFBF
, IO_BUFFER_SIZE
);
2198 name
= ggc_strdup (name
);
2200 input_filename
= name
;
2202 /* Put an entry on the input file stack for the main input file. */
2203 push_srcloc (input_filename
, 0);
2205 /* Perform language-specific initialization.
2206 This may set main_input_filename. */
2207 if (lang_hooks
.init
)
2208 (*lang_hooks
.init
) ();
2210 /* If the input doesn't start with a #line, use the input name
2211 as the official input file name. */
2212 if (main_input_filename
== 0)
2213 main_input_filename
= name
;
2215 if (flag_syntax_only
)
2217 write_symbols
= NO_DEBUG
;
2219 profile_block_flag
= 0;
2223 #ifdef ASM_FILE_START
2224 ASM_FILE_START (asm_out_file
);
2227 #ifdef ASM_COMMENT_START
2228 if (flag_verbose_asm
)
2230 /* Print the list of options in effect. */
2231 print_version (asm_out_file
, ASM_COMMENT_START
);
2232 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2233 ASM_COMMENT_START
, " ", "\n");
2234 /* Add a blank line here so it appears in assembler output but not
2236 fprintf (asm_out_file
, "\n");
2239 } /* ! flag_syntax_only */
2241 /* Set up the debug hooks based on write_symbols. Default to doing
2243 debug_hooks
= &do_nothing_debug_hooks
;
2244 #if defined(DBX_DEBUGGING_INFO)
2245 if (write_symbols
== DBX_DEBUG
)
2246 debug_hooks
= &dbx_debug_hooks
;
2248 #if defined(XCOFF_DEBUGGING_INFO)
2249 if (write_symbols
== XCOFF_DEBUG
)
2250 debug_hooks
= &xcoff_debug_hooks
;
2252 #ifdef SDB_DEBUGGING_INFO
2253 if (write_symbols
== SDB_DEBUG
)
2254 debug_hooks
= &sdb_debug_hooks
;
2256 #ifdef DWARF_DEBUGGING_INFO
2257 if (write_symbols
== DWARF_DEBUG
)
2258 debug_hooks
= &dwarf_debug_hooks
;
2260 #ifdef DWARF2_DEBUGGING_INFO
2261 if (write_symbols
== DWARF2_DEBUG
)
2262 debug_hooks
= &dwarf2_debug_hooks
;
2265 #ifndef ASM_OUTPUT_SECTION_NAME
2266 if (flag_function_sections
)
2268 warning ("-ffunction-sections not supported for this target.");
2269 flag_function_sections
= 0;
2271 if (flag_data_sections
)
2273 warning ("-fdata-sections not supported for this target.");
2274 flag_data_sections
= 0;
2278 if (flag_function_sections
2279 && (profile_flag
|| profile_block_flag
))
2281 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2282 flag_function_sections
= 0;
2285 #ifndef OBJECT_FORMAT_ELF
2286 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2287 warning ("-ffunction-sections may affect debugging on some targets.");
2290 /* If dbx symbol table desired, initialize writing it
2291 and output the predefined types. */
2292 timevar_push (TV_SYMOUT
);
2293 #ifdef DWARF2_UNWIND_INFO
2294 if (dwarf2out_do_frame ())
2295 dwarf2out_frame_init ();
2298 (*debug_hooks
->init
) (main_input_filename
);
2299 timevar_pop (TV_SYMOUT
);
2301 /* Initialize yet another pass. */
2303 init_final (main_input_filename
);
2304 init_branch_prob (dump_base_name
);
2306 timevar_push (TV_PARSE
);
2308 /* Call the parser, which parses the entire file
2309 (calling rest_of_compilation for each function). */
2311 if (yyparse () != 0)
2313 if (errorcount
== 0)
2314 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2316 /* In case there were missing closebraces,
2317 get us back to the global binding level. */
2318 while (! global_bindings_p ())
2322 /* Compilation is now finished except for writing
2323 what's left of the symbol table output. */
2325 timevar_pop (TV_PARSE
);
2327 if (flag_syntax_only
)
2330 globals
= getdecls ();
2332 /* Really define vars that have had only a tentative definition.
2333 Really output inline functions that must actually be callable
2334 and have not been output so far. */
2337 int len
= list_length (globals
);
2338 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2342 /* Process the decls in reverse order--earliest first.
2343 Put them into VEC from back to front, then take out from front. */
2345 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2346 vec
[len
- i
- 1] = decl
;
2348 wrapup_global_declarations (vec
, len
);
2350 /* This must occur after the loop to output deferred functions. Else
2351 the profiler initializer would not be emitted if all the functions
2352 in this compilation unit were deferred.
2354 output_func_start_profiler can not cause any additional functions or
2355 data to need to be output, so it need not be in the deferred function
2357 output_func_start_profiler ();
2359 check_global_declarations (vec
, len
);
2365 /* Write out any pending weak symbol declarations. */
2369 /* Do dbx symbols. */
2370 timevar_push (TV_SYMOUT
);
2372 #ifdef DWARF2_UNWIND_INFO
2373 if (dwarf2out_do_frame ())
2374 dwarf2out_frame_finish ();
2377 (*debug_hooks
->finish
) (main_input_filename
);
2378 timevar_pop (TV_SYMOUT
);
2380 /* Output some stuff at end of file if nec. */
2382 dw2_output_indirect_constants ();
2384 end_final (dump_base_name
);
2386 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2388 timevar_push (TV_DUMP
);
2389 open_dump_file (DFI_bp
, NULL
);
2393 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2394 timevar_pop (TV_DUMP
);
2398 ASM_FILE_END (asm_out_file
);
2401 /* Attach a special .ident directive to the end of the file to identify
2402 the version of GCC which compiled this code. The format of the .ident
2403 string is patterned after the ones produced by native SVR4 compilers. */
2406 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2407 IDENT_ASM_OP
, version_string
);
2410 /* Language-specific end of compilation actions. */
2412 if (lang_hooks
.finish
)
2413 (*lang_hooks
.finish
) ();
2415 /* Close the dump files. */
2417 if (flag_gen_aux_info
)
2419 fclose (aux_info_file
);
2421 unlink (aux_info_file_name
);
2424 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2426 timevar_push (TV_DUMP
);
2427 dump_combine_total_stats (rtl_dump_file
);
2428 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2429 timevar_pop (TV_DUMP
);
2432 /* Close non-debugging input and output files. Take special care to note
2433 whether fclose returns an error, since the pages might still be on the
2434 buffer chain while the file is open. */
2438 if (ferror (asm_out_file
) != 0)
2439 fatal_io_error ("error writing to %s", asm_file_name
);
2440 if (fclose (asm_out_file
) != 0)
2441 fatal_io_error ("error closing %s", asm_file_name
);
2443 /* Do whatever is necessary to finish printing the graphs. */
2444 if (graph_dump_format
!= no_graph
)
2448 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2449 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2454 sprintf (seq
, ".%02d.", i
);
2455 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2456 finish_graph_dump_file (dump_base_name
, suffix
);
2463 ggc_print_statistics ();
2464 stringpool_statistics ();
2467 /* Free up memory for the benefit of leak detectors. */
2470 /* Stop timing total execution time. */
2471 timevar_stop (TV_TOTAL
);
2473 /* Print the times. */
2475 timevar_print (stderr
);
2478 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2479 and TYPE_DECL nodes.
2481 This does nothing for local (non-static) variables, unless the
2482 variable is a register variable with an ASMSPEC. In that case, or
2483 if the variable is not an automatic, it sets up the RTL and
2484 outputs any assembler code (label definition, storage allocation
2485 and initialization).
2487 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2488 the assembler symbol name to be used. TOP_LEVEL is nonzero
2489 if this declaration is not within a function. */
2492 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2494 const char *asmspec
;
2498 /* Declarations of variables, and of functions defined elsewhere. */
2500 /* The most obvious approach, to put an #ifndef around where
2501 this macro is used, doesn't work since it's inside a macro call. */
2502 #ifndef ASM_FINISH_DECLARE_OBJECT
2503 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2506 /* Forward declarations for nested functions are not "external",
2507 but we need to treat them as if they were. */
2508 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2509 || TREE_CODE (decl
) == FUNCTION_DECL
)
2511 timevar_push (TV_VARCONST
);
2513 make_decl_rtl (decl
, asmspec
);
2514 /* Don't output anything
2515 when a tentative file-scope definition is seen.
2516 But at end of compilation, do output code for them. */
2517 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2518 assemble_variable (decl
, top_level
, at_end
, 0);
2519 if (decl
== last_assemble_variable_decl
)
2521 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2524 timevar_pop (TV_VARCONST
);
2526 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2528 if (decode_reg_name (asmspec
) >= 0)
2530 SET_DECL_RTL (decl
, NULL_RTX
);
2531 make_decl_rtl (decl
, asmspec
);
2535 error ("invalid register name `%s' for register variable", asmspec
);
2536 DECL_REGISTER (decl
) = 0;
2541 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2542 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2543 && TREE_CODE (decl
) == TYPE_DECL
)
2545 timevar_push (TV_SYMOUT
);
2546 dbxout_symbol (decl
, 0);
2547 timevar_pop (TV_SYMOUT
);
2550 #ifdef SDB_DEBUGGING_INFO
2551 else if (write_symbols
== SDB_DEBUG
&& top_level
2552 && TREE_CODE (decl
) == TYPE_DECL
)
2554 timevar_push (TV_SYMOUT
);
2555 sdbout_symbol (decl
, 0);
2556 timevar_pop (TV_SYMOUT
);
2561 /* Called after finishing a record, union or enumeral type. */
2564 rest_of_type_compilation (type
, toplev
)
2565 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2569 tree type ATTRIBUTE_UNUSED
;
2570 int toplev ATTRIBUTE_UNUSED
;
2573 timevar_push (TV_SYMOUT
);
2574 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2575 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2576 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2578 #ifdef SDB_DEBUGGING_INFO
2579 if (write_symbols
== SDB_DEBUG
)
2580 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2582 #ifdef DWARF2_DEBUGGING_INFO
2583 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2584 dwarf2out_decl (TYPE_STUB_DECL (type
));
2586 timevar_pop (TV_SYMOUT
);
2589 /* This is called from finish_function (within yyparse)
2590 after each top-level definition is parsed.
2591 It is supposed to compile that function or variable
2592 and output the assembler code for it.
2593 After we return, the tree storage is freed. */
2596 rest_of_compilation (decl
)
2602 int rebuild_label_notes_after_reload
;
2603 int register_life_up_to_date
;
2605 timevar_push (TV_REST_OF_COMPILATION
);
2607 /* Now that we're out of the frontend, we shouldn't have any more
2608 CONCATs anywhere. */
2609 generating_concat_p
= 0;
2611 /* When processing delayed functions, prepare_function_start() won't
2612 have been run to re-initialize it. */
2613 cse_not_expected
= ! optimize
;
2615 /* First, make sure that NOTE_BLOCK is set correctly for each
2616 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2617 if (!cfun
->x_whole_function_mode_p
)
2620 /* Then remove any notes we don't need. That will make iterating
2621 over the instruction sequence faster, and allow the garbage
2622 collector to reclaim the memory used by the notes. */
2623 remove_unnecessary_notes ();
2625 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2626 tree in sensible shape. So, we just recalculate it here. */
2627 if (cfun
->x_whole_function_mode_p
)
2632 /* If we are reconsidering an inline function
2633 at the end of compilation, skip the stuff for making it inline. */
2635 if (DECL_SAVED_INSNS (decl
) == 0)
2641 /* If this is nested inside an inlined external function, pretend
2642 it was only declared. Since we cannot inline such functions,
2643 generating code for this one is not only not necessary but will
2644 confuse some debugging output writers. */
2645 for (parent
= DECL_CONTEXT (current_function_decl
);
2646 parent
!= NULL_TREE
;
2647 parent
= get_containing_scope (parent
))
2648 if (TREE_CODE (parent
) == FUNCTION_DECL
2649 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2651 DECL_INITIAL (decl
) = 0;
2652 goto exit_rest_of_compilation
;
2655 /* If requested, consider whether to make this function inline. */
2656 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2657 || flag_inline_functions
)
2659 timevar_push (TV_INTEGRATION
);
2660 lose
= function_cannot_inline_p (decl
);
2661 timevar_pop (TV_INTEGRATION
);
2662 if (lose
|| ! optimize
)
2664 if (warn_inline
&& DECL_INLINE (decl
))
2665 warning_with_decl (decl
, lose
);
2666 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2667 /* Don't really compile an extern inline function.
2668 If we can't make it inline, pretend
2669 it was only declared. */
2670 if (DECL_EXTERNAL (decl
))
2672 DECL_INITIAL (decl
) = 0;
2673 goto exit_rest_of_compilation
;
2677 /* ??? Note that this has the effect of making it look
2678 like "inline" was specified for a function if we choose
2679 to inline it. This isn't quite right, but it's
2680 probably not worth the trouble to fix. */
2681 inlinable
= DECL_INLINE (decl
) = 1;
2684 insns
= get_insns ();
2686 /* Dump the rtl code if we are dumping rtl. */
2688 if (open_dump_file (DFI_rtl
, decl
))
2690 if (DECL_SAVED_INSNS (decl
))
2691 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2692 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2695 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2696 sorts of eh initialization. Delay this until after the
2697 initial rtl dump so that we can see the original nesting. */
2698 convert_from_eh_region_ranges ();
2700 /* If function is inline, and we don't yet know whether to
2701 compile it by itself, defer decision till end of compilation.
2702 finish_compilation will call rest_of_compilation again
2703 for those functions that need to be output. Also defer those
2704 functions that we are supposed to defer. */
2707 || (DECL_INLINE (decl
)
2708 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2709 && ! flag_keep_inline_functions
)
2710 || DECL_EXTERNAL (decl
))))
2711 DECL_DEFER_OUTPUT (decl
) = 1;
2713 if (DECL_INLINE (decl
))
2714 /* DWARF wants seperate debugging info for abstract and
2715 concrete instances of all inline functions, including those
2716 declared inline but not inlined, and those inlined even
2717 though they weren't declared inline. Conveniently, that's
2718 what DECL_INLINE means at this point. */
2719 (*debug_hooks
->deferred_inline_function
) (decl
);
2721 if (DECL_DEFER_OUTPUT (decl
))
2723 /* If -Wreturn-type, we have to do a bit of compilation. We just
2724 want to call cleanup the cfg to figure out whether or not we can
2725 fall off the end of the function; we do the minimum amount of
2726 work necessary to make that safe. */
2727 if (warn_return_type
)
2729 int saved_optimize
= optimize
;
2732 rebuild_jump_labels (insns
);
2733 find_exception_handler_labels ();
2734 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2735 cleanup_cfg (CLEANUP_PRE_SIBCALL
);
2736 optimize
= saved_optimize
;
2739 current_function_nothrow
= nothrow_function_p ();
2740 if (current_function_nothrow
)
2741 /* Now we know that this can't throw; set the flag for the benefit
2742 of other functions later in this translation unit. */
2743 TREE_NOTHROW (current_function_decl
) = 1;
2745 timevar_push (TV_INTEGRATION
);
2746 save_for_inline (decl
);
2747 timevar_pop (TV_INTEGRATION
);
2748 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2749 goto exit_rest_of_compilation
;
2752 /* If specified extern inline but we aren't inlining it, we are
2753 done. This goes for anything that gets here with DECL_EXTERNAL
2754 set, not just things with DECL_INLINE. */
2755 if (DECL_EXTERNAL (decl
))
2756 goto exit_rest_of_compilation
;
2761 /* Initialize some variables used by the optimizers. */
2762 init_function_for_compilation ();
2764 if (! DECL_DEFER_OUTPUT (decl
))
2765 TREE_ASM_WRITTEN (decl
) = 1;
2767 /* Now that integrate will no longer see our rtl, we need not
2768 distinguish between the return value of this function and the
2769 return value of called functions. Also, we can remove all SETs
2770 of subregs of hard registers; they are only here because of
2771 integrate. Also, we can now initialize pseudos intended to
2772 carry magic hard reg data throughout the function. */
2773 rtx_equal_function_value_matters
= 0;
2774 purge_hard_subreg_sets (get_insns ());
2775 emit_initial_value_sets ();
2777 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2778 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2779 goto exit_rest_of_compilation
;
2781 /* We may have potential sibling or tail recursion sites. Select one
2782 (of possibly multiple) methods of performing the call. */
2783 if (flag_optimize_sibling_calls
)
2785 timevar_push (TV_JUMP
);
2786 open_dump_file (DFI_sibling
, decl
);
2788 optimize_sibling_and_tail_recursive_calls ();
2790 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2791 timevar_pop (TV_JUMP
);
2794 /* Complete generation of exception handling code. */
2795 find_exception_handler_labels ();
2798 timevar_push (TV_JUMP
);
2799 open_dump_file (DFI_eh
, decl
);
2801 finish_eh_generation ();
2803 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2804 timevar_pop (TV_JUMP
);
2808 /* If we are doing position-independent code generation, now
2809 is the time to output special prologues and epilogues.
2810 We do not want to do this earlier, because it just clutters
2811 up inline functions with meaningless insns. */
2816 insns
= get_insns ();
2818 /* Copy any shared structure that should not be shared. */
2819 unshare_all_rtl (current_function_decl
, insns
);
2821 #ifdef SETJMP_VIA_SAVE_AREA
2822 /* This must be performed before virutal register instantiation. */
2823 if (current_function_calls_alloca
)
2824 optimize_save_area_alloca (insns
);
2827 /* Instantiate all virtual registers. */
2828 instantiate_virtual_regs (current_function_decl
, insns
);
2830 open_dump_file (DFI_jump
, decl
);
2832 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2833 are initialized and to compute whether control can drop off the end
2836 timevar_push (TV_JUMP
);
2837 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2838 before jump optimization switches branch directions. */
2839 expected_value_to_br_prob ();
2841 reg_scan (insns
, max_reg_num (), 0);
2842 rebuild_jump_labels (insns
);
2843 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2844 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
2845 copy_loop_headers (insns
);
2846 purge_line_number_notes (insns
);
2848 timevar_pop (TV_JUMP
);
2850 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2851 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2853 close_dump_file (DFI_jump
, print_rtl
, insns
);
2854 goto exit_rest_of_compilation
;
2857 /* Long term, this should probably move before the jump optimizer too,
2858 but I didn't want to disturb the rtl_dump_and_exit and related
2859 stuff at this time. */
2860 if (optimize
> 0 && flag_ssa
)
2862 /* Convert to SSA form. */
2864 timevar_push (TV_TO_SSA
);
2865 open_dump_file (DFI_ssa
, decl
);
2867 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2868 cleanup_cfg (CLEANUP_EXPENSIVE
);
2871 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2872 timevar_pop (TV_TO_SSA
);
2874 /* Perform sparse conditional constant propagation, if requested. */
2877 timevar_push (TV_SSA_CCP
);
2878 open_dump_file (DFI_ssa_ccp
, decl
);
2882 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2883 timevar_pop (TV_SSA_CCP
);
2886 /* It would be useful to cleanup the CFG at this point, but block
2887 merging and possibly other transformations might leave a PHI
2888 node in the middle of a basic block, which is a strict no-no. */
2890 /* The SSA implementation uses basic block numbers in its phi
2891 nodes. Thus, changing the control-flow graph or the basic
2892 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2893 may cause problems. */
2897 /* Remove dead code. */
2899 timevar_push (TV_SSA_DCE
);
2900 open_dump_file (DFI_ssa_dce
, decl
);
2902 insns
= get_insns ();
2903 ssa_eliminate_dead_code();
2905 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2906 timevar_pop (TV_SSA_DCE
);
2909 /* Convert from SSA form. */
2911 timevar_push (TV_FROM_SSA
);
2912 open_dump_file (DFI_ussa
, decl
);
2914 convert_from_ssa ();
2915 /* New registers have been created. Rescan their usage. */
2916 reg_scan (insns
, max_reg_num (), 1);
2917 /* Life analysis used in SSA adds log_links but these
2918 shouldn't be there until the flow stage, so clear
2920 clear_log_links (insns
);
2922 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2923 timevar_pop (TV_FROM_SSA
);
2928 timevar_push (TV_JUMP
);
2932 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2933 cleanup_cfg (CLEANUP_EXPENSIVE
);
2935 /* ??? Run if-conversion before delete_null_pointer_checks,
2936 since the later does not preserve the CFG. This should
2937 be changed -- no since converting if's that are going to
2939 timevar_push (TV_IFCVT
);
2941 timevar_pop (TV_IFCVT
);
2943 /* Try to identify useless null pointer tests and delete them. */
2944 if (flag_delete_null_pointer_checks
)
2945 delete_null_pointer_checks (insns
);
2948 /* Jump optimization, and the removal of NULL pointer checks, may
2949 have reduced the number of instructions substantially. CSE, and
2950 future passes, allocate arrays whose dimensions involve the
2951 maximum instruction UID, so if we can reduce the maximum UID
2952 we'll save big on memory. */
2953 renumber_insns (rtl_dump_file
);
2954 timevar_pop (TV_JUMP
);
2956 close_dump_file (DFI_jump
, print_rtl
, insns
);
2960 /* Perform common subexpression elimination.
2961 Nonzero value from `cse_main' means that jumps were simplified
2962 and some code may now be unreachable, so do
2963 jump optimization again. */
2967 open_dump_file (DFI_cse
, decl
);
2968 timevar_push (TV_CSE
);
2970 reg_scan (insns
, max_reg_num (), 1);
2972 if (flag_thread_jumps
)
2974 timevar_push (TV_JUMP
);
2975 thread_jumps (insns
, max_reg_num (), 1);
2976 timevar_pop (TV_JUMP
);
2979 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2981 /* If we are not running more CSE passes, then we are no longer
2982 expecting CSE to be run. But always rerun it in a cheap mode. */
2983 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2985 if (tem
|| optimize
> 1)
2987 timevar_push (TV_JUMP
);
2988 rebuild_jump_labels (insns
);
2989 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2990 cleanup_cfg (CLEANUP_EXPENSIVE
);
2991 timevar_pop (TV_JUMP
);
2994 /* Run this after jump optmizations remove all the unreachable code
2995 so that unreachable code will not keep values live. */
2996 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2998 /* Try to identify useless null pointer tests and delete them. */
2999 if (flag_delete_null_pointer_checks
)
3001 timevar_push (TV_JUMP
);
3002 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3004 cleanup_cfg (CLEANUP_EXPENSIVE
);
3006 delete_null_pointer_checks (insns
);
3007 timevar_pop (TV_JUMP
);
3010 /* The second pass of jump optimization is likely to have
3011 removed a bunch more instructions. */
3012 renumber_insns (rtl_dump_file
);
3014 timevar_pop (TV_CSE
);
3015 close_dump_file (DFI_cse
, print_rtl
, insns
);
3018 open_dump_file (DFI_addressof
, decl
);
3020 purge_addressof (insns
);
3021 reg_scan (insns
, max_reg_num (), 1);
3023 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3027 /* Perform global cse. */
3029 if (optimize
> 0 && flag_gcse
)
3031 int save_csb
, save_cfj
;
3034 timevar_push (TV_GCSE
);
3035 open_dump_file (DFI_gcse
, decl
);
3037 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3038 cleanup_cfg (CLEANUP_EXPENSIVE
);
3039 tem
= gcse_main (insns
, rtl_dump_file
);
3041 save_csb
= flag_cse_skip_blocks
;
3042 save_cfj
= flag_cse_follow_jumps
;
3043 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3045 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3047 if (flag_expensive_optimizations
)
3049 timevar_push (TV_CSE
);
3050 reg_scan (insns
, max_reg_num (), 1);
3051 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3052 timevar_pop (TV_CSE
);
3053 cse_not_expected
= !flag_rerun_cse_after_loop
;
3056 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3057 things up. Then possibly re-run CSE again. */
3061 timevar_push (TV_JUMP
);
3062 rebuild_jump_labels (insns
);
3063 cleanup_cfg (CLEANUP_EXPENSIVE
);
3064 timevar_pop (TV_JUMP
);
3066 if (flag_expensive_optimizations
)
3068 timevar_push (TV_CSE
);
3069 reg_scan (insns
, max_reg_num (), 1);
3070 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3071 timevar_pop (TV_CSE
);
3075 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3076 timevar_pop (TV_GCSE
);
3079 flag_cse_skip_blocks
= save_csb
;
3080 flag_cse_follow_jumps
= save_cfj
;
3083 /* Move constant computations out of loops. */
3087 timevar_push (TV_LOOP
);
3088 open_dump_file (DFI_loop
, decl
);
3090 if (flag_rerun_loop_opt
)
3092 /* We only want to perform unrolling once. */
3094 loop_optimize (insns
, rtl_dump_file
, 0);
3096 /* The first call to loop_optimize makes some instructions
3097 trivially dead. We delete those instructions now in the
3098 hope that doing so will make the heuristics in loop work
3099 better and possibly speed up compilation. */
3100 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3102 /* The regscan pass is currently necessary as the alias
3103 analysis code depends on this information. */
3104 reg_scan (insns
, max_reg_num (), 1);
3106 loop_optimize (insns
, rtl_dump_file
,
3107 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3109 close_dump_file (DFI_loop
, print_rtl
, insns
);
3110 timevar_pop (TV_LOOP
);
3117 timevar_push (TV_CSE2
);
3118 open_dump_file (DFI_cse2
, decl
);
3120 if (flag_rerun_cse_after_loop
)
3122 /* Running another jump optimization pass before the second
3123 cse pass sometimes simplifies the RTL enough to allow
3124 the second CSE pass to do a better job. Jump_optimize can change
3125 max_reg_num so we must rerun reg_scan afterwards.
3126 ??? Rework to not call reg_scan so often. */
3127 timevar_push (TV_JUMP
);
3129 /* The previous call to loop_optimize makes some instructions
3130 trivially dead. We delete those instructions now in the
3131 hope that doing so will make the heuristics in jump work
3132 better and possibly speed up compilation. */
3133 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3135 reg_scan (insns
, max_reg_num (), 0);
3137 timevar_push (TV_IFCVT
);
3139 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3140 cleanup_cfg (CLEANUP_EXPENSIVE
);
3143 timevar_pop(TV_IFCVT
);
3145 timevar_pop (TV_JUMP
);
3147 reg_scan (insns
, max_reg_num (), 0);
3148 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3152 timevar_push (TV_JUMP
);
3153 rebuild_jump_labels (insns
);
3154 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3155 cleanup_cfg (CLEANUP_EXPENSIVE
);
3156 timevar_pop (TV_JUMP
);
3160 if (flag_thread_jumps
)
3162 /* This pass of jump threading straightens out code
3163 that was kinked by loop optimization. */
3164 timevar_push (TV_JUMP
);
3165 reg_scan (insns
, max_reg_num (), 0);
3166 thread_jumps (insns
, max_reg_num (), 0);
3167 timevar_pop (TV_JUMP
);
3170 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3171 timevar_pop (TV_CSE2
);
3176 cse_not_expected
= 1;
3180 /* Do control and data flow analysis; wrote some of the results to
3183 timevar_push (TV_FLOW
);
3184 open_dump_file (DFI_cfg
, decl
);
3186 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3187 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3188 check_function_return_warnings ();
3190 /* It may make more sense to mark constant functions after dead code is
3191 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3192 may insert code making function non-constant, but we still must consider
3193 it as constant, otherwise -fbranch-probabilities will not read data back.
3195 life_analyzis rarely eliminates modification of external memory.
3197 mark_constant_function ();
3199 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3201 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3203 timevar_push (TV_BRANCH_PROB
);
3204 open_dump_file (DFI_bp
, decl
);
3208 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3209 timevar_pop (TV_BRANCH_PROB
);
3212 open_dump_file (DFI_life
, decl
);
3217 /* Discover and record the loop depth at the head of each basic
3218 block. The loop infrastructure does the real job for us. */
3219 flow_loops_find (&loops
, LOOP_TREE
);
3221 /* Estimate using heuristics if no profiling info is available. */
3222 if (flag_guess_branch_prob
)
3223 estimate_probability (&loops
);
3226 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3228 flow_loops_free (&loops
);
3230 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3231 timevar_pop (TV_FLOW
);
3235 if (warn_uninitialized
|| extra_warnings
)
3237 uninitialized_vars_warning (DECL_INITIAL (decl
));
3239 setjmp_args_warning ();
3242 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3246 /* If -opt, try combining insns through substitution. */
3250 int rebuild_jump_labels_after_combine
= 0;
3252 timevar_push (TV_COMBINE
);
3253 open_dump_file (DFI_combine
, decl
);
3255 rebuild_jump_labels_after_combine
3256 = combine_instructions (insns
, max_reg_num ());
3258 /* Combining insns may have turned an indirect jump into a
3259 direct jump. Rebuid the JUMP_LABEL fields of jumping
3261 if (rebuild_jump_labels_after_combine
)
3263 timevar_push (TV_JUMP
);
3264 rebuild_jump_labels (insns
);
3265 timevar_pop (TV_JUMP
);
3267 timevar_push (TV_FLOW
);
3268 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3269 cleanup_cfg (CLEANUP_EXPENSIVE
);
3271 /* Blimey. We've got to have the CFG up to date for the call to
3272 if_convert below. However, the random deletion of blocks
3273 without updating life info can wind up with Wierd Stuff in
3274 global_live_at_end. We then run sched1, which updates things
3275 properly, discovers the wierdness and aborts. */
3276 allocate_bb_life_data ();
3277 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3278 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3279 | PROP_SCAN_DEAD_CODE
);
3281 timevar_pop (TV_FLOW
);
3284 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3285 timevar_pop (TV_COMBINE
);
3290 /* Rerun if-conversion, as combine may have simplified things enough to
3291 now meet sequence length restrictions. */
3294 timevar_push (TV_IFCVT
);
3295 open_dump_file (DFI_ce
, decl
);
3301 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3302 timevar_pop (TV_IFCVT
);
3305 /* Register allocation pre-pass, to reduce number of moves
3306 necessary for two-address machines. */
3307 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3309 timevar_push (TV_REGMOVE
);
3310 open_dump_file (DFI_regmove
, decl
);
3312 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3314 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3315 timevar_pop (TV_REGMOVE
);
3320 /* Do unconditional splitting before register allocation to allow machine
3321 description to add extra information not needed previously. */
3322 split_all_insns (1);
3324 /* Any of the several passes since flow1 will have munged register
3325 lifetime data a bit. */
3326 register_life_up_to_date
= 0;
3328 #ifdef OPTIMIZE_MODE_SWITCHING
3329 timevar_push (TV_GCSE
);
3332 if (optimize_mode_switching (NULL
))
3334 /* We did work, and so had to regenerate global life information.
3335 Take advantage of this and don't re-recompute register life
3336 information below. */
3337 register_life_up_to_date
= 1;
3341 timevar_pop (TV_GCSE
);
3344 timevar_push (TV_SCHED
);
3346 #ifdef INSN_SCHEDULING
3348 /* Print function header into sched dump now
3349 because doing the sched analysis makes some of the dump. */
3350 if (optimize
> 0 && flag_schedule_insns
)
3352 open_dump_file (DFI_sched
, decl
);
3354 /* Do control and data sched analysis,
3355 and write some of the results to dump file. */
3357 schedule_insns (rtl_dump_file
);
3359 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3361 /* Register lifetime information was updated as part of verifying
3363 register_life_up_to_date
= 1;
3366 timevar_pop (TV_SCHED
);
3370 /* Determine if the current function is a leaf before running reload
3371 since this can impact optimizations done by the prologue and
3372 epilogue thus changing register elimination offsets. */
3373 current_function_is_leaf
= leaf_function_p ();
3375 timevar_push (TV_LOCAL_ALLOC
);
3376 open_dump_file (DFI_lreg
, decl
);
3378 /* Allocate pseudo-regs that are used only within 1 basic block.
3380 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3381 jump optimizer after register allocation and reloading are finished. */
3383 if (! register_life_up_to_date
)
3384 recompute_reg_usage (insns
, ! optimize_size
);
3385 regclass (insns
, max_reg_num (), rtl_dump_file
);
3386 rebuild_label_notes_after_reload
= local_alloc ();
3388 timevar_pop (TV_LOCAL_ALLOC
);
3390 if (dump_file
[DFI_lreg
].enabled
)
3392 timevar_push (TV_DUMP
);
3394 dump_flow_info (rtl_dump_file
);
3395 dump_local_alloc (rtl_dump_file
);
3397 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3398 timevar_pop (TV_DUMP
);
3403 timevar_push (TV_GLOBAL_ALLOC
);
3404 open_dump_file (DFI_greg
, decl
);
3406 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3407 pass fixing up any insns that are invalid. */
3410 failure
= global_alloc (rtl_dump_file
);
3413 build_insn_chain (insns
);
3414 failure
= reload (insns
, 0);
3417 timevar_pop (TV_GLOBAL_ALLOC
);
3419 if (dump_file
[DFI_greg
].enabled
)
3421 timevar_push (TV_DUMP
);
3423 dump_global_regs (rtl_dump_file
);
3425 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3426 timevar_pop (TV_DUMP
);
3430 goto exit_rest_of_compilation
;
3434 open_dump_file (DFI_postreload
, decl
);
3436 /* Do a very simple CSE pass over just the hard registers. */
3439 timevar_push (TV_RELOAD_CSE_REGS
);
3440 reload_cse_regs (insns
);
3441 timevar_pop (TV_RELOAD_CSE_REGS
);
3444 /* If optimizing, then go ahead and split insns now since we are about
3445 to recompute flow information anyway. */
3448 int old_labelnum
= max_label_num ();
3450 split_all_insns (0);
3451 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3454 /* Register allocation and reloading may have turned an indirect jump into
3455 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3456 jumping instructions. */
3457 if (rebuild_label_notes_after_reload
)
3459 timevar_push (TV_JUMP
);
3461 rebuild_jump_labels (insns
);
3463 timevar_pop (TV_JUMP
);
3466 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3468 /* Re-create the death notes which were deleted during reload. */
3469 timevar_push (TV_FLOW2
);
3470 open_dump_file (DFI_flow2
, decl
);
3472 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3475 /* On some machines, the prologue and epilogue code, or parts thereof,
3476 can be represented as RTL. Doing so lets us schedule insns between
3477 it and the rest of the code and also allows delayed branch
3478 scheduling to operate in the epilogue. */
3479 thread_prologue_and_epilogue_insns (insns
);
3483 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_CROSSJUMP
);
3484 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3486 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3487 even for machines with possibly nonzero RETURN_POPS_ARGS
3488 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3489 push instructions will have popping returns. */
3490 #ifndef PUSH_ROUNDING
3491 if (!ACCUMULATE_OUTGOING_ARGS
)
3493 combine_stack_adjustments ();
3498 flow2_completed
= 1;
3500 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3501 timevar_pop (TV_FLOW2
);
3503 #ifdef HAVE_peephole2
3504 if (optimize
> 0 && flag_peephole2
)
3506 timevar_push (TV_PEEPHOLE2
);
3507 open_dump_file (DFI_peephole2
, decl
);
3509 peephole2_optimize (rtl_dump_file
);
3511 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3512 timevar_pop (TV_PEEPHOLE2
);
3516 if (optimize
> 0 && flag_rename_registers
)
3518 timevar_push (TV_RENAME_REGISTERS
);
3519 open_dump_file (DFI_rnreg
, decl
);
3521 regrename_optimize ();
3523 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3524 timevar_pop (TV_RENAME_REGISTERS
);
3529 timevar_push (TV_IFCVT2
);
3530 open_dump_file (DFI_ce2
, decl
);
3534 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3535 timevar_pop (TV_IFCVT2
);
3539 split_all_insns (1);
3542 #ifdef INSN_SCHEDULING
3543 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3545 timevar_push (TV_SCHED2
);
3546 open_dump_file (DFI_sched2
, decl
);
3548 /* Do control and data sched analysis again,
3549 and write some more of the results to dump file. */
3551 split_all_insns (1);
3553 schedule_insns (rtl_dump_file
);
3555 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3556 timevar_pop (TV_SCHED2
);
3562 #ifdef LEAF_REGISTERS
3563 current_function_uses_only_leaf_regs
3564 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3568 timevar_push (TV_REG_STACK
);
3569 open_dump_file (DFI_stack
, decl
);
3571 reg_to_stack (insns
, rtl_dump_file
);
3573 close_dump_file (DFI_stack
, print_rtl
, insns
);
3574 timevar_pop (TV_REG_STACK
);
3580 timevar_push (TV_REORDER_BLOCKS
);
3581 open_dump_file (DFI_bbro
, decl
);
3583 /* Last attempt to optimize CFG, as life analyzis possibly removed
3584 some instructions. */
3585 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3586 | CLEANUP_CROSSJUMP
);
3587 if (flag_reorder_blocks
)
3589 reorder_basic_blocks ();
3590 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3593 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3594 timevar_pop (TV_REORDER_BLOCKS
);
3597 /* If a machine dependent reorganization is needed, call it. */
3598 #ifdef MACHINE_DEPENDENT_REORG
3599 open_dump_file (DFI_mach
, decl
);
3601 MACHINE_DEPENDENT_REORG (insns
);
3603 close_dump_file (DFI_mach
, print_rtl
, insns
);
3608 /* CFG no longer kept up to date. */
3610 purge_line_number_notes (insns
);
3612 /* If a scheduling pass for delayed branches is to be done,
3613 call the scheduling code. */
3616 if (optimize
> 0 && flag_delayed_branch
)
3618 timevar_push (TV_DBR_SCHED
);
3619 open_dump_file (DFI_dbr
, decl
);
3621 dbr_schedule (insns
, rtl_dump_file
);
3623 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3624 timevar_pop (TV_DBR_SCHED
);
3630 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3631 timevar_push (TV_SHORTEN_BRANCH
);
3632 split_all_insns (0);
3633 timevar_pop (TV_SHORTEN_BRANCH
);
3636 convert_to_eh_region_ranges ();
3638 /* Shorten branches. */
3639 timevar_push (TV_SHORTEN_BRANCH
);
3640 shorten_branches (get_insns ());
3641 timevar_pop (TV_SHORTEN_BRANCH
);
3643 current_function_nothrow
= nothrow_function_p ();
3644 if (current_function_nothrow
)
3645 /* Now we know that this can't throw; set the flag for the benefit
3646 of other functions later in this translation unit. */
3647 TREE_NOTHROW (current_function_decl
) = 1;
3649 /* Now turn the rtl into assembler code. */
3651 timevar_push (TV_FINAL
);
3656 /* Get the function's name, as described by its RTL. This may be
3657 different from the DECL_NAME name used in the source file. */
3659 x
= DECL_RTL (decl
);
3660 if (GET_CODE (x
) != MEM
)
3663 if (GET_CODE (x
) != SYMBOL_REF
)
3665 fnname
= XSTR (x
, 0);
3667 assemble_start_function (decl
, fnname
);
3668 final_start_function (insns
, asm_out_file
, optimize
);
3669 final (insns
, asm_out_file
, optimize
, 0);
3670 final_end_function ();
3672 #ifdef IA64_UNWIND_INFO
3673 /* ??? The IA-64 ".handlerdata" directive must be issued before
3674 the ".endp" directive that closes the procedure descriptor. */
3675 output_function_exception_table ();
3678 assemble_end_function (decl
, fnname
);
3680 #ifndef IA64_UNWIND_INFO
3681 /* Otherwise, it feels unclean to switch sections in the middle. */
3682 output_function_exception_table ();
3686 fflush (asm_out_file
);
3688 /* Release all memory allocated by flow. */
3689 free_basic_block_vars (0);
3691 /* Release all memory held by regsets now. */
3692 regset_release_memory ();
3694 timevar_pop (TV_FINAL
);
3698 /* Write DBX symbols if requested. */
3700 /* Note that for those inline functions where we don't initially
3701 know for certain that we will be generating an out-of-line copy,
3702 the first invocation of this routine (rest_of_compilation) will
3703 skip over this code by doing a `goto exit_rest_of_compilation;'.
3704 Later on, finish_compilation will call rest_of_compilation again
3705 for those inline functions that need to have out-of-line copies
3706 generated. During that call, we *will* be routed past here. */
3708 timevar_push (TV_SYMOUT
);
3709 (*debug_hooks
->function_decl
) (decl
);
3710 timevar_pop (TV_SYMOUT
);
3712 exit_rest_of_compilation
:
3714 /* In case the function was not output,
3715 don't leave any temporary anonymous types
3716 queued up for sdb output. */
3717 #ifdef SDB_DEBUGGING_INFO
3718 if (write_symbols
== SDB_DEBUG
)
3719 sdbout_types (NULL_TREE
);
3722 reload_completed
= 0;
3723 flow2_completed
= 0;
3726 timevar_push (TV_FINAL
);
3728 /* Clear out the insn_length contents now that they are no
3730 init_insn_lengths ();
3732 /* Clear out the real_constant_chain before some of the rtx's
3733 it runs through become garbage. */
3734 clear_const_double_mem ();
3736 /* Show no temporary slots allocated. */
3739 free_basic_block_vars (0);
3741 timevar_pop (TV_FINAL
);
3743 /* Make sure volatile mem refs aren't considered valid operands for
3744 arithmetic insns. We must call this here if this is a nested inline
3745 function, since the above code leaves us in the init_recog state
3746 (from final.c), and the function context push/pop code does not
3747 save/restore volatile_ok.
3749 ??? Maybe it isn't necessary for expand_start_function to call this
3750 anymore if we do it here? */
3752 init_recog_no_volatile ();
3754 /* We're done with this function. Free up memory if we can. */
3755 free_after_parsing (cfun
);
3756 if (! DECL_DEFER_OUTPUT (decl
))
3757 free_after_compilation (cfun
);
3762 timevar_pop (TV_REST_OF_COMPILATION
);
3772 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3773 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3774 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3775 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3776 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3777 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"));
3779 for (i
= ARRAY_SIZE (f_options
); i
--;)
3781 const char *description
= f_options
[i
].description
;
3783 if (description
!= NULL
&& * description
!= 0)
3784 printf (" -f%-21s %s\n",
3785 f_options
[i
].string
, _(description
));
3788 printf (_(" -O[number] Set optimisation level to [number]\n"));
3789 printf (_(" -Os Optimise for space rather than speed\n"));
3790 for (i
= LAST_PARAM
; i
--;)
3792 const char *description
= compiler_params
[i
].help
;
3793 const int length
= 21-strlen(compiler_params
[i
].option
);
3795 if (description
!= NULL
&& * description
!= 0)
3796 printf (" --param %s=<value>%.*s%s\n",
3797 compiler_params
[i
].option
,
3798 length
> 0 ? length
: 1, " ",
3801 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3802 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3803 printf (_(" -w Suppress warnings\n"));
3804 printf (_(" -W Enable extra warnings\n"));
3806 for (i
= ARRAY_SIZE (W_options
); i
--;)
3808 const char *description
= W_options
[i
].description
;
3810 if (description
!= NULL
&& * description
!= 0)
3811 printf (" -W%-21s %s\n",
3812 W_options
[i
].string
, _(description
));
3815 printf (_(" -Wunused Enable unused warnings\n"));
3816 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3817 printf (_(" -p Enable function profiling\n"));
3818 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3819 printf (_(" -a Enable block profiling \n"));
3821 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3822 printf (_(" -ax Enable jump profiling \n"));
3824 printf (_(" -o <file> Place output into <file> \n"));
3826 -G <number> Put global and static data smaller than <number>\n\
3827 bytes into a special section (on some targets)\n"));
3829 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3831 if (debug_args
[i
].description
!= NULL
)
3832 printf (" -g%-21s %s\n",
3833 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3836 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3837 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3838 printf (_(" -version Display the compiler's version\n"));
3839 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3840 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3841 #if defined INSN_SCHEDULING
3842 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3844 printf (_(" --help Display this information\n"));
3849 /* Display descriptions of language specific options.
3850 If there is no description, note that there is an undocumented option.
3851 If the description is empty, do not display anything. (This allows
3852 options to be deliberately undocumented, for whatever reason).
3853 If the option string is missing, then this is a marker, indicating
3854 that the description string is in fact the name of a language, whose
3855 language specific options are to follow. */
3857 if (ARRAY_SIZE (documented_lang_options
) > 1)
3859 printf (_("\nLanguage specific options:\n"));
3861 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3863 const char *description
= documented_lang_options
[i
].description
;
3864 const char *option
= documented_lang_options
[i
].option
;
3866 if (description
== NULL
)
3871 printf (_(" %-23.23s [undocumented]\n"), option
);
3873 else if (*description
== 0)
3875 else if (option
== NULL
)
3879 (_("\nThere are undocumented %s specific options as well.\n"),
3883 printf (_("\n Options for %s:\n"), description
);
3888 printf (" %-23.23s %s\n", option
, _(description
));
3893 printf (_("\nThere are undocumented %s specific options as well.\n"),
3896 display_target_options ();
3900 display_target_options ()
3904 if (ARRAY_SIZE (target_switches
) > 1
3905 #ifdef TARGET_OPTIONS
3906 || ARRAY_SIZE (target_options
) > 1
3914 printf (_("\nTarget specific options:\n"));
3916 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3918 const char *option
= target_switches
[i
].name
;
3919 const char *description
= target_switches
[i
].description
;
3921 if (option
== NULL
|| *option
== 0)
3923 else if (description
== NULL
)
3928 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3930 else if (* description
!= 0)
3931 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3934 #ifdef TARGET_OPTIONS
3935 for (i
= ARRAY_SIZE (target_options
); i
--;)
3937 const char *option
= target_options
[i
].prefix
;
3938 const char *description
= target_options
[i
].description
;
3940 if (option
== NULL
|| *option
== 0)
3942 else if (description
== NULL
)
3947 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3949 else if (* description
!= 0)
3950 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3956 printf (_("\nThere are undocumented target specific options as well.\n"));
3958 printf (_(" They exist, but they are not documented.\n"));
3963 /* Parse a -d... comand line switch. */
3966 decode_d_option (arg
)
3975 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3976 dump_file
[i
].enabled
= 1;
3982 flag_print_asm_name
= 1;
3985 flag_dump_rtl_in_asm
= 1;
3986 flag_print_asm_name
= 1;
3989 graph_dump_format
= vcg
;
3992 rtl_dump_and_exit
= 1;
3997 case 'D': /* These are handled by the preprocessor. */
4003 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4004 if (c
== dump_file
[i
].debug_switch
)
4006 dump_file
[i
].enabled
= 1;
4011 warning ("unrecognized gcc debugging option: %c", c
);
4016 /* Parse a -f... comand line switch. ARG is the value after the -f.
4017 It is safe to access 'ARG - 2' to generate the full switch name.
4018 Return the number of strings consumed. */
4021 decode_f_option (arg
)
4025 const char *option_value
= NULL
;
4027 /* Search for the option in the table of binary f options. */
4028 for (j
= ARRAY_SIZE (f_options
); j
--;)
4030 if (!strcmp (arg
, f_options
[j
].string
))
4032 *f_options
[j
].variable
= f_options
[j
].on_value
;
4036 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4037 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4039 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4044 if (!strcmp (arg
, "fast-math"))
4045 set_fast_math_flags();
4046 else if (!strcmp (arg
, "no-fast-math"))
4047 set_no_fast_math_flags();
4048 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4049 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4052 read_integral_parameter (option_value
, arg
- 2,
4054 set_param_value ("max-inline-insns", val
);
4056 #ifdef INSN_SCHEDULING
4057 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4058 fix_sched_param ("verbose", option_value
);
4060 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4061 fix_register (option_value
, 1, 1);
4062 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4063 fix_register (option_value
, 0, 1);
4064 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4065 fix_register (option_value
, 0, 0);
4066 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4067 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4068 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4070 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4071 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4072 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4073 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4075 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4076 else if ((option_value
4077 = skip_leading_substring (arg
, "stack-limit-register=")))
4079 int reg
= decode_reg_name (option_value
);
4081 error ("unrecognized register name `%s'", option_value
);
4083 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4085 else if ((option_value
4086 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4089 nm
= ggc_strdup (option_value
);
4090 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4092 else if ((option_value
4093 = skip_leading_substring (arg
, "message-length=")))
4094 output_set_maximum_length
4095 (&global_dc
->buffer
, read_integral_parameter
4096 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4097 else if ((option_value
4098 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4100 if (!strcmp (option_value
, "once"))
4101 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4102 else if (!strcmp (option_value
, "every-line"))
4103 diagnostic_prefixing_rule (global_dc
)
4104 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4106 error ("Unrecognized option `%s'", arg
- 2);
4108 else if (!strcmp (arg
, "no-stack-limit"))
4109 stack_limit_rtx
= NULL_RTX
;
4110 else if (!strcmp (arg
, "preprocessed"))
4111 /* Recognise this switch but do nothing. This prevents warnings
4112 about an unrecognized switch if cpplib has not been linked in. */
4120 /* Parse a -W... comand line switch. ARG is the value after the -W.
4121 It is safe to access 'ARG - 2' to generate the full switch name.
4122 Return the number of strings consumed. */
4125 decode_W_option (arg
)
4128 const char *option_value
= NULL
;
4131 /* Search for the option in the table of binary W options. */
4133 for (j
= ARRAY_SIZE (W_options
); j
--;)
4135 if (!strcmp (arg
, W_options
[j
].string
))
4137 *W_options
[j
].variable
= W_options
[j
].on_value
;
4141 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4142 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4144 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4149 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4150 warning ("-Wid-clash-LEN is no longer supported");
4151 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4153 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4155 warn_larger_than
= larger_than_size
!= -1;
4157 else if (!strcmp (arg
, "unused"))
4161 else if (!strcmp (arg
, "no-unused"))
4171 /* Parse a -g... comand line switch. ARG is the value after the -g.
4172 It is safe to access 'ARG - 2' to generate the full switch name.
4173 Return the number of strings consumed. */
4176 decode_g_option (arg
)
4179 static unsigned level
=0;
4180 /* A lot of code assumes write_symbols == NO_DEBUG if the
4181 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4182 of what debugging type has been selected). This records the
4183 selected type. It is an error to specify more than one
4185 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4186 /* Non-zero if debugging format has been explicitly set.
4187 -g and -ggdb don't explicitly set the debugging format so
4188 -gdwarf -g3 is equivalent to -gdwarf3. */
4189 static int type_explicitly_set_p
= 0;
4190 /* Indexed by enum debug_info_type. */
4191 static const char *debug_type_names
[] =
4193 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4196 /* The maximum admissible debug level value. */
4197 static const unsigned max_debug_level
= 3;
4199 /* Look up ARG in the table. */
4200 for (da
= debug_args
; da
->arg
; da
++)
4202 const int da_len
= strlen (da
->arg
);
4204 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4206 enum debug_info_type type
= da
->debug_type
;
4207 const char *p
= arg
+ da_len
;
4209 if (*p
&& (*p
< '0' || *p
> '9'))
4212 /* A debug flag without a level defaults to level 2.
4213 Note we do not want to call read_integral_parameter
4214 for that case since it will call atoi which
4217 ??? We may want to generalize the interface to
4218 read_integral_parameter to better handle this case
4219 if this case shows up often. */
4221 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4223 level
= (level
== 0) ? 2 : level
;
4225 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4227 error ("use -gdwarf -g%d for DWARF v1, level %d",
4230 error ("use -gdwarf-2 for DWARF v2");
4233 if (level
> max_debug_level
)
4236 ignoring option `%s' due to invalid debug level specification",
4238 level
= debug_info_level
;
4241 if (type
== NO_DEBUG
)
4243 type
= PREFERRED_DEBUGGING_TYPE
;
4245 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4247 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4248 type
= DWARF2_DEBUG
;
4250 #ifdef DBX_DEBUGGING_INFO
4257 if (type
== NO_DEBUG
)
4258 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4260 /* Does it conflict with an already selected type? */
4261 if (type_explicitly_set_p
4262 /* -g/-ggdb don't conflict with anything. */
4263 && da
->debug_type
!= NO_DEBUG
4264 && type
!= selected_debug_type
)
4265 warning ("`%s' ignored, conflicts with `-g%s'",
4266 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4269 /* If the format has already been set, -g/-ggdb
4270 only change the debug level. */
4271 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4272 /* Don't change debugging type. */
4276 selected_debug_type
= type
;
4277 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4280 write_symbols
= (level
== 0
4282 : selected_debug_type
);
4283 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4284 debug_info_level
= (enum debug_info_level
) level
;
4297 /* Decode the first argument in the argv as a language-independent option.
4298 Return the number of strings consumed. */
4301 independent_decode_option (argc
, argv
)
4305 char *arg
= argv
[0];
4307 if (arg
[0] != '-' || arg
[1] == 0)
4319 if (!strcmp (arg
, "-help"))
4322 exit_after_options
= 1;
4325 if (!strcmp (arg
, "-target-help"))
4327 display_target_options ();
4328 exit_after_options
= 1;
4331 if (!strcmp (arg
, "-version"))
4333 print_version (stderr
, "");
4334 exit_after_options
= 1;
4337 /* Handle '--param <name>=<value>'. */
4338 if (strcmp (arg
, "-param") == 0)
4344 error ("-param option missing argument");
4348 /* Get the '<name>=<value>' parameter. */
4350 /* Look for the `='. */
4351 equal
= strchr (arg
, '=');
4353 error ("invalid --param option: %s", arg
);
4358 /* Zero out the `=' sign so that we get two separate strings. */
4360 /* Figure out what value is specified. */
4361 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4362 if (val
!= INVALID_PARAM_VAL
)
4363 set_param_value (arg
, val
);
4365 error ("invalid parameter value `%s'", equal
+ 1);
4380 /* Already been treated in main (). Do nothing. */
4384 set_target_switch (arg
+ 1);
4388 return decode_f_option (arg
+ 1);
4391 return decode_g_option (arg
+ 1);
4394 if (!strcmp (arg
, "dumpbase"))
4399 dump_base_name
= argv
[1];
4403 decode_d_option (arg
+ 1);
4407 if (!strcmp (arg
, "pedantic"))
4409 else if (!strcmp (arg
, "pedantic-errors"))
4410 flag_pedantic_errors
= pedantic
= 1;
4411 else if (arg
[1] == 0)
4418 if (!strcmp (arg
, "quiet"))
4425 if (!strcmp (arg
, "version"))
4433 inhibit_warnings
= 1;
4442 /* We save the value of warn_uninitialized, since if they put
4443 -Wuninitialized on the command line, we need to generate a
4444 warning about not using it without also specifying -O. */
4445 if (warn_uninitialized
!= 1)
4446 warn_uninitialized
= 2;
4449 return decode_W_option (arg
+ 1);
4455 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4456 warning ("`-a' option (basic block profile) not supported");
4458 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4461 else if (!strcmp (arg
, "ax"))
4463 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4464 warning ("`-ax' option (jump profiling) not supported");
4466 profile_block_flag
= (!profile_block_flag
4467 || profile_block_flag
== 2) ? 2 : 3;
4470 else if (!strncmp (arg
, "aux-info", 8))
4477 aux_info_file_name
= argv
[1];
4478 flag_gen_aux_info
= 1;
4481 else if (arg
[8] == '=')
4483 aux_info_file_name
= arg
+ 9;
4484 flag_gen_aux_info
= 1;
4499 asm_file_name
= argv
[1];
4514 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4519 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4523 if (g_switch_val
== -1)
4527 g_switch_set
= TRUE
;
4528 g_switch_value
= g_switch_val
;
4538 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4539 Decode command args, then call compile_file.
4540 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4541 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4543 It is not safe to call this function more than once. */
4546 toplev_main (argc
, argv
)
4553 /* save in case md file wants to emit args as a comment. */
4557 p
= argv
[0] + strlen (argv
[0]);
4558 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4562 xmalloc_set_program_name (progname
);
4564 /* LC_CTYPE determines the character set used by the terminal so it has be set
4565 to output messages correctly. */
4567 #ifdef HAVE_LC_MESSAGES
4568 setlocale (LC_CTYPE
, "");
4569 setlocale (LC_MESSAGES
, "");
4571 setlocale (LC_ALL
, "");
4574 (void) bindtextdomain (PACKAGE
, localedir
);
4575 (void) textdomain (PACKAGE
);
4577 /* Install handler for SIGFPE, which may be received while we do
4578 compile-time floating point arithmetic. */
4579 signal (SIGFPE
, float_signal
);
4581 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4583 signal (SIGSEGV
, crash_signal
);
4586 signal (SIGILL
, crash_signal
);
4589 signal (SIGBUS
, crash_signal
);
4592 signal (SIGABRT
, crash_signal
);
4594 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4595 signal (SIGIOT
, crash_signal
);
4598 decl_printable_name
= decl_name
;
4599 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4601 /* Initialize whether `char' is signed. */
4602 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4603 #ifdef DEFAULT_SHORT_ENUMS
4604 /* Initialize how much space enums occupy, by default. */
4605 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4608 /* Initialize the garbage-collector. */
4611 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4612 ggc_add_tree_root (¤t_function_decl
, 1);
4613 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4615 /* Initialize the diagnostics reporting machinery. */
4616 diagnostic_initialize (global_dc
);
4618 /* Register the language-independent parameters. */
4619 add_params (lang_independent_params
, LAST_PARAM
);
4621 /* Perform language-specific options intialization. */
4622 if (lang_hooks
.init_options
)
4623 (*lang_hooks
.init_options
) ();
4625 /* Scan to see what optimization level has been specified. That will
4626 determine the default value of many flags. */
4627 for (i
= 1; i
< argc
; i
++)
4629 if (!strcmp (argv
[i
], "-O"))
4634 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4636 /* Handle -Os, -O2, -O3, -O69, ... */
4637 char *p
= &argv
[i
][2];
4639 if ((p
[0] == 's') && (p
[1] == 0))
4643 /* Optimizing for size forces optimize to be 2. */
4648 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4649 if (optimize_val
!= -1)
4651 optimize
= optimize_val
;
4661 flag_thread_jumps
= 1;
4663 flag_delayed_branch
= 1;
4665 #ifdef CAN_DEBUG_WITHOUT_FP
4666 flag_omit_frame_pointer
= 1;
4668 flag_guess_branch_prob
= 1;
4673 flag_optimize_sibling_calls
= 1;
4674 flag_cse_follow_jumps
= 1;
4675 flag_cse_skip_blocks
= 1;
4677 flag_expensive_optimizations
= 1;
4678 flag_strength_reduce
= 1;
4679 flag_rerun_cse_after_loop
= 1;
4680 flag_rerun_loop_opt
= 1;
4681 flag_caller_saves
= 1;
4684 #ifdef INSN_SCHEDULING
4685 flag_schedule_insns
= 1;
4686 flag_schedule_insns_after_reload
= 1;
4689 flag_strict_aliasing
= 1;
4690 flag_delete_null_pointer_checks
= 1;
4691 flag_reorder_blocks
= 1;
4696 flag_inline_functions
= 1;
4697 flag_rename_registers
= 1;
4700 if (optimize
< 2 || optimize_size
)
4705 align_functions
= 1;
4708 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4711 set_target_switch ("");
4713 /* Unwind tables are always present in an ABI-conformant IA-64
4714 object file, so the default should be ON. */
4715 #ifdef IA64_UNWIND_INFO
4716 flag_unwind_tables
= IA64_UNWIND_INFO
;
4719 #ifdef OPTIMIZATION_OPTIONS
4720 /* Allow default optimizations to be specified on a per-machine basis. */
4721 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4724 /* Initialize register usage now so switches may override. */
4727 /* Perform normal command line switch decoding. */
4728 for (i
= 1; i
< argc
;)
4731 int indep_processed
;
4733 /* Give the language a chance to decode the option for itself. */
4734 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4736 if (lang_processed
>= 0)
4737 /* Now see if the option also has a language independent meaning.
4738 Some options are both language specific and language independent,
4740 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4743 lang_processed
= -lang_processed
;
4744 indep_processed
= 0;
4747 if (lang_processed
|| indep_processed
)
4748 i
+= MAX (lang_processed
, indep_processed
);
4751 const char *option
= NULL
;
4752 const char *lang
= NULL
;
4755 /* It is possible that the command line switch is not valid for the
4756 current language, but it is valid for another language. In order
4757 to be compatible with previous versions of the compiler (which
4758 did not issue an error message in this case) we check for this
4759 possibility here. If we do find a match, then if extra_warnings
4760 is set we generate a warning message, otherwise we will just
4761 ignore the option. */
4762 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4764 option
= documented_lang_options
[j
].option
;
4767 lang
= documented_lang_options
[j
].description
;
4768 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4772 if (j
!= ARRAY_SIZE (documented_lang_options
))
4776 warning ("Ignoring command line option '%s'", argv
[i
]);
4779 ("(It is valid for %s but not the selected language)",
4783 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4784 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4786 error ("Unrecognized option `%s'", argv
[i
]);
4792 /* All command line options have been processed. */
4793 if (lang_hooks
.post_options
)
4794 (*lang_hooks
.post_options
) ();
4796 if (exit_after_options
)
4799 /* Checker uses the frame pointer. */
4800 if (flag_check_memory_usage
)
4801 flag_omit_frame_pointer
= 0;
4805 /* Inlining does not work if not optimizing,
4806 so force it not to be done. */
4810 /* The c_decode_option function and decode_option hook set
4811 this to `2' if -Wall is used, so we can avoid giving out
4812 lots of errors for people who don't realize what -Wall does. */
4813 if (warn_uninitialized
== 1)
4814 warning ("-Wuninitialized is not supported without -O");
4817 /* We do not currently support sibling-call optimization in the
4818 presence of exceptions. See PR2975 for a test-case that will
4819 fail if we try to combine both of these features. */
4820 if (flag_exceptions
)
4821 flag_optimize_sibling_calls
= 0;
4823 #ifdef OVERRIDE_OPTIONS
4824 /* Some machines may reject certain combinations of options. */
4828 /* Set up the align_*_log variables, defaulting them to 1 if they
4829 were still unset. */
4830 if (align_loops
<= 0) align_loops
= 1;
4831 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4832 if (align_jumps
<= 0) align_jumps
= 1;
4833 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4834 if (align_labels
<= 0) align_labels
= 1;
4835 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4836 if (align_functions
<= 0) align_functions
= 1;
4837 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4839 if (profile_block_flag
== 3)
4841 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4842 profile_block_flag
= 2;
4845 /* Unrolling all loops implies that standard loop unrolling must also
4847 if (flag_unroll_all_loops
)
4848 flag_unroll_loops
= 1;
4849 /* Loop unrolling requires that strength_reduction be on also. Silently
4850 turn on strength reduction here if it isn't already on. Also, the loop
4851 unrolling code assumes that cse will be run after loop, so that must
4852 be turned on also. */
4853 if (flag_unroll_loops
)
4855 flag_strength_reduce
= 1;
4856 flag_rerun_cse_after_loop
= 1;
4859 /* Warn about options that are not supported on this machine. */
4860 #ifndef INSN_SCHEDULING
4861 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4862 warning ("instruction scheduling not supported on this target machine");
4865 if (flag_delayed_branch
)
4866 warning ("this target machine does not have delayed branches");
4869 /* Some operating systems do not allow profiling without a frame
4871 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4873 && flag_omit_frame_pointer
)
4875 error ("profiling does not work without a frame pointer");
4876 flag_omit_frame_pointer
= 0;
4879 user_label_prefix
= USER_LABEL_PREFIX
;
4880 if (flag_leading_underscore
!= -1)
4882 /* If the default prefix is more complicated than "" or "_",
4883 issue a warning and ignore this option. */
4884 if (user_label_prefix
[0] == 0 ||
4885 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4887 user_label_prefix
= flag_leading_underscore
? "_" : "";
4890 warning ("-f%sleading-underscore not supported on this target machine",
4891 flag_leading_underscore
? "" : "no-");
4894 /* If we are in verbose mode, write out the version and maybe all the
4895 option flags in use. */
4898 print_version (stderr
, "");
4900 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4903 compile_file (filename
);
4906 return (FATAL_EXIT_CODE
);
4908 return (FATAL_EXIT_CODE
);
4909 return (SUCCESS_EXIT_CODE
);
4912 /* Decode -m switches. */
4913 /* Decode the switch -mNAME. */
4916 set_target_switch (name
)
4920 int valid_target_option
= 0;
4922 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4923 if (!strcmp (target_switches
[j
].name
, name
))
4925 if (target_switches
[j
].value
< 0)
4926 target_flags
&= ~-target_switches
[j
].value
;
4928 target_flags
|= target_switches
[j
].value
;
4929 valid_target_option
= 1;
4932 #ifdef TARGET_OPTIONS
4933 if (!valid_target_option
)
4934 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4936 int len
= strlen (target_options
[j
].prefix
);
4937 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4939 *target_options
[j
].variable
= name
+ len
;
4940 valid_target_option
= 1;
4945 if (!valid_target_option
)
4946 error ("Invalid option `%s'", name
);
4949 /* Print version information to FILE.
4950 Each line begins with INDENT (for the case where FILE is the
4951 assembler output file). */
4954 print_version (file
, indent
)
4959 #define __VERSION__ "[?]"
4963 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4965 "%s%s%s version %s (%s) compiled by CC.\n"
4967 , indent
, *indent
!= 0 ? " " : "",
4968 language_string
, version_string
, TARGET_NAME
,
4969 indent
, __VERSION__
);
4972 /* Print an option value and return the adjusted position in the line.
4973 ??? We don't handle error returns from fprintf (disk full); presumably
4974 other code will catch a disk full though. */
4977 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4980 const char *indent
, *sep
, *term
, *type
, *name
;
4982 /* The ultrix fprintf returns 0 on success, so compute the result we want
4983 here since we need it for the following test. */
4984 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4989 fprintf (file
, "%s", term
);
4994 fprintf (file
, "%s", indent
);
4995 pos
= strlen (indent
);
4997 fprintf (file
, "%s%s%s", sep
, type
, name
);
5002 /* Print active target switches to FILE.
5003 POS is the current cursor position and MAX is the size of a "line".
5004 Each line begins with INDENT and ends with TERM.
5005 Each switch is separated from the next by SEP. */
5008 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5011 const char *indent
, *sep
, *term
;
5016 /* Print the options as passed. */
5018 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5019 _("options passed: "), "");
5021 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5025 if (strcmp (*p
, "-o") == 0)
5031 if (strcmp (*p
, "-quiet") == 0)
5033 if (strcmp (*p
, "-version") == 0)
5038 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5041 fprintf (file
, "%s", term
);
5043 /* Print the -f and -m options that have been enabled.
5044 We don't handle language specific options but printing argv
5047 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5048 _("options enabled: "), "");
5050 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5051 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5052 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5053 "-f", f_options
[j
].string
);
5055 /* Print target specific options. */
5057 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5058 if (target_switches
[j
].name
[0] != '\0'
5059 && target_switches
[j
].value
> 0
5060 && ((target_switches
[j
].value
& target_flags
)
5061 == target_switches
[j
].value
))
5063 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5064 "-m", target_switches
[j
].name
);
5067 #ifdef TARGET_OPTIONS
5068 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5069 if (*target_options
[j
].variable
!= NULL
)
5072 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5073 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5074 prefix
, *target_options
[j
].variable
);
5078 fprintf (file
, "%s", term
);