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 jump_optimize. */
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 jump_optimize (insns
, !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
2844 timevar_pop (TV_JUMP
);
2846 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2847 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2849 close_dump_file (DFI_jump
, print_rtl
, insns
);
2850 goto exit_rest_of_compilation
;
2853 /* Long term, this should probably move before the jump optimizer too,
2854 but I didn't want to disturb the rtl_dump_and_exit and related
2855 stuff at this time. */
2856 if (optimize
> 0 && flag_ssa
)
2858 /* Convert to SSA form. */
2860 timevar_push (TV_TO_SSA
);
2861 open_dump_file (DFI_ssa
, decl
);
2863 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2864 cleanup_cfg (CLEANUP_EXPENSIVE
);
2867 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2868 timevar_pop (TV_TO_SSA
);
2870 /* Perform sparse conditional constant propagation, if requested. */
2873 timevar_push (TV_SSA_CCP
);
2874 open_dump_file (DFI_ssa_ccp
, decl
);
2878 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2879 timevar_pop (TV_SSA_CCP
);
2882 /* It would be useful to cleanup the CFG at this point, but block
2883 merging and possibly other transformations might leave a PHI
2884 node in the middle of a basic block, which is a strict no-no. */
2886 /* The SSA implementation uses basic block numbers in its phi
2887 nodes. Thus, changing the control-flow graph or the basic
2888 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2889 may cause problems. */
2893 /* Remove dead code. */
2895 timevar_push (TV_SSA_DCE
);
2896 open_dump_file (DFI_ssa_dce
, decl
);
2898 insns
= get_insns ();
2899 ssa_eliminate_dead_code();
2901 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2902 timevar_pop (TV_SSA_DCE
);
2905 /* Convert from SSA form. */
2907 timevar_push (TV_FROM_SSA
);
2908 open_dump_file (DFI_ussa
, decl
);
2910 convert_from_ssa ();
2911 /* New registers have been created. Rescan their usage. */
2912 reg_scan (insns
, max_reg_num (), 1);
2913 /* Life analysis used in SSA adds log_links but these
2914 shouldn't be there until the flow stage, so clear
2916 clear_log_links (insns
);
2918 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2919 timevar_pop (TV_FROM_SSA
);
2924 timevar_push (TV_JUMP
);
2928 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2929 cleanup_cfg (CLEANUP_EXPENSIVE
);
2931 /* ??? Run if-conversion before delete_null_pointer_checks,
2932 since the later does not preserve the CFG. This should
2933 be changed -- no since converting if's that are going to
2935 timevar_push (TV_IFCVT
);
2937 timevar_pop (TV_IFCVT
);
2939 /* Try to identify useless null pointer tests and delete them. */
2940 if (flag_delete_null_pointer_checks
)
2941 delete_null_pointer_checks (insns
);
2944 /* Jump optimization, and the removal of NULL pointer checks, may
2945 have reduced the number of instructions substantially. CSE, and
2946 future passes, allocate arrays whose dimensions involve the
2947 maximum instruction UID, so if we can reduce the maximum UID
2948 we'll save big on memory. */
2949 renumber_insns (rtl_dump_file
);
2950 timevar_pop (TV_JUMP
);
2952 close_dump_file (DFI_jump
, print_rtl
, insns
);
2956 /* Perform common subexpression elimination.
2957 Nonzero value from `cse_main' means that jumps were simplified
2958 and some code may now be unreachable, so do
2959 jump optimization again. */
2963 open_dump_file (DFI_cse
, decl
);
2964 timevar_push (TV_CSE
);
2966 reg_scan (insns
, max_reg_num (), 1);
2968 if (flag_thread_jumps
)
2970 timevar_push (TV_JUMP
);
2971 thread_jumps (insns
, max_reg_num (), 1);
2972 timevar_pop (TV_JUMP
);
2975 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2977 /* If we are not running more CSE passes, then we are no longer
2978 expecting CSE to be run. But always rerun it in a cheap mode. */
2979 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2981 if (tem
|| optimize
> 1)
2983 timevar_push (TV_JUMP
);
2984 jump_optimize (insns
, !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
2985 timevar_pop (TV_JUMP
);
2988 /* Run this after jump optmizations remove all the unreachable code
2989 so that unreachable code will not keep values live. */
2990 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
2992 /* Try to identify useless null pointer tests and delete them. */
2993 if (flag_delete_null_pointer_checks
)
2995 timevar_push (TV_JUMP
);
2996 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2998 cleanup_cfg (CLEANUP_EXPENSIVE
);
3000 delete_null_pointer_checks (insns
);
3001 timevar_pop (TV_JUMP
);
3004 /* The second pass of jump optimization is likely to have
3005 removed a bunch more instructions. */
3006 renumber_insns (rtl_dump_file
);
3008 timevar_pop (TV_CSE
);
3009 close_dump_file (DFI_cse
, print_rtl
, insns
);
3012 open_dump_file (DFI_addressof
, decl
);
3014 purge_addressof (insns
);
3015 reg_scan (insns
, max_reg_num (), 1);
3017 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3021 /* Perform global cse. */
3023 if (optimize
> 0 && flag_gcse
)
3025 int save_csb
, save_cfj
;
3028 timevar_push (TV_GCSE
);
3029 open_dump_file (DFI_gcse
, decl
);
3031 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3032 cleanup_cfg (CLEANUP_EXPENSIVE
);
3033 tem
= gcse_main (insns
, rtl_dump_file
);
3035 save_csb
= flag_cse_skip_blocks
;
3036 save_cfj
= flag_cse_follow_jumps
;
3037 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3039 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3041 if (flag_expensive_optimizations
)
3043 timevar_push (TV_CSE
);
3044 reg_scan (insns
, max_reg_num (), 1);
3045 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3046 timevar_pop (TV_CSE
);
3047 cse_not_expected
= !flag_rerun_cse_after_loop
;
3050 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3051 things up. Then possibly re-run CSE again. */
3055 timevar_push (TV_JUMP
);
3056 jump_optimize (insns
, !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3057 timevar_pop (TV_JUMP
);
3059 if (flag_expensive_optimizations
)
3061 timevar_push (TV_CSE
);
3062 reg_scan (insns
, max_reg_num (), 1);
3063 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3064 timevar_pop (TV_CSE
);
3068 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3069 timevar_pop (TV_GCSE
);
3072 flag_cse_skip_blocks
= save_csb
;
3073 flag_cse_follow_jumps
= save_cfj
;
3076 /* Move constant computations out of loops. */
3080 timevar_push (TV_LOOP
);
3081 open_dump_file (DFI_loop
, decl
);
3083 if (flag_rerun_loop_opt
)
3085 /* We only want to perform unrolling once. */
3087 loop_optimize (insns
, rtl_dump_file
, 0);
3089 /* The first call to loop_optimize makes some instructions
3090 trivially dead. We delete those instructions now in the
3091 hope that doing so will make the heuristics in loop work
3092 better and possibly speed up compilation. */
3093 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3095 /* The regscan pass is currently necessary as the alias
3096 analysis code depends on this information. */
3097 reg_scan (insns
, max_reg_num (), 1);
3099 loop_optimize (insns
, rtl_dump_file
,
3100 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3102 close_dump_file (DFI_loop
, print_rtl
, insns
);
3103 timevar_pop (TV_LOOP
);
3110 timevar_push (TV_CSE2
);
3111 open_dump_file (DFI_cse2
, decl
);
3113 if (flag_rerun_cse_after_loop
)
3115 /* Running another jump optimization pass before the second
3116 cse pass sometimes simplifies the RTL enough to allow
3117 the second CSE pass to do a better job. Jump_optimize can change
3118 max_reg_num so we must rerun reg_scan afterwards.
3119 ??? Rework to not call reg_scan so often. */
3120 timevar_push (TV_JUMP
);
3122 /* The previous call to loop_optimize makes some instructions
3123 trivially dead. We delete those instructions now in the
3124 hope that doing so will make the heuristics in jump work
3125 better and possibly speed up compilation. */
3126 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3128 reg_scan (insns
, max_reg_num (), 0);
3129 jump_optimize (insns
, !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3131 timevar_push (TV_IFCVT
);
3133 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3134 cleanup_cfg (CLEANUP_EXPENSIVE
);
3137 timevar_pop(TV_IFCVT
);
3139 timevar_pop (TV_JUMP
);
3141 reg_scan (insns
, max_reg_num (), 0);
3142 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3146 timevar_push (TV_JUMP
);
3147 jump_optimize (insns
, !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3148 timevar_pop (TV_JUMP
);
3152 if (flag_thread_jumps
)
3154 /* This pass of jump threading straightens out code
3155 that was kinked by loop optimization. */
3156 timevar_push (TV_JUMP
);
3157 reg_scan (insns
, max_reg_num (), 0);
3158 thread_jumps (insns
, max_reg_num (), 0);
3159 timevar_pop (TV_JUMP
);
3162 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3163 timevar_pop (TV_CSE2
);
3168 cse_not_expected
= 1;
3172 /* Do control and data flow analysis; wrote some of the results to
3175 timevar_push (TV_FLOW
);
3176 open_dump_file (DFI_cfg
, decl
);
3178 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3179 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3180 check_function_return_warnings ();
3182 /* It may make more sense to mark constant functions after dead code is
3183 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3184 may insert code making function non-constant, but we still must consider
3185 it as constant, otherwise -fbranch-probabilities will not read data back.
3187 life_analyzis rarely eliminates modification of external memory.
3189 mark_constant_function ();
3191 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3193 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3195 timevar_push (TV_BRANCH_PROB
);
3196 open_dump_file (DFI_bp
, decl
);
3200 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3201 timevar_pop (TV_BRANCH_PROB
);
3204 open_dump_file (DFI_life
, decl
);
3209 /* Discover and record the loop depth at the head of each basic
3210 block. The loop infrastructure does the real job for us. */
3211 flow_loops_find (&loops
, LOOP_TREE
);
3213 /* Estimate using heuristics if no profiling info is available. */
3214 if (flag_guess_branch_prob
)
3215 estimate_probability (&loops
);
3218 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3220 flow_loops_free (&loops
);
3222 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3223 timevar_pop (TV_FLOW
);
3227 if (warn_uninitialized
|| extra_warnings
)
3229 uninitialized_vars_warning (DECL_INITIAL (decl
));
3231 setjmp_args_warning ();
3234 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3238 /* If -opt, try combining insns through substitution. */
3242 int rebuild_jump_labels_after_combine
= 0;
3244 timevar_push (TV_COMBINE
);
3245 open_dump_file (DFI_combine
, decl
);
3247 rebuild_jump_labels_after_combine
3248 = combine_instructions (insns
, max_reg_num ());
3250 /* Combining insns may have turned an indirect jump into a
3251 direct jump. Rebuid the JUMP_LABEL fields of jumping
3253 if (rebuild_jump_labels_after_combine
)
3255 timevar_push (TV_JUMP
);
3256 rebuild_jump_labels (insns
);
3257 timevar_pop (TV_JUMP
);
3259 timevar_push (TV_FLOW
);
3260 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3261 cleanup_cfg (CLEANUP_EXPENSIVE
);
3263 /* Blimey. We've got to have the CFG up to date for the call to
3264 if_convert below. However, the random deletion of blocks
3265 without updating life info can wind up with Wierd Stuff in
3266 global_live_at_end. We then run sched1, which updates things
3267 properly, discovers the wierdness and aborts. */
3268 allocate_bb_life_data ();
3269 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3270 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3271 | PROP_SCAN_DEAD_CODE
);
3273 timevar_pop (TV_FLOW
);
3276 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3277 timevar_pop (TV_COMBINE
);
3282 /* Rerun if-conversion, as combine may have simplified things enough to
3283 now meet sequence length restrictions. */
3286 timevar_push (TV_IFCVT
);
3287 open_dump_file (DFI_ce
, decl
);
3293 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3294 timevar_pop (TV_IFCVT
);
3297 /* Register allocation pre-pass, to reduce number of moves
3298 necessary for two-address machines. */
3299 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3301 timevar_push (TV_REGMOVE
);
3302 open_dump_file (DFI_regmove
, decl
);
3304 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3306 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3307 timevar_pop (TV_REGMOVE
);
3312 /* Do unconditional splitting before register allocation to allow machine
3313 description to add extra information not needed previously. */
3314 split_all_insns (1);
3316 /* Any of the several passes since flow1 will have munged register
3317 lifetime data a bit. */
3318 register_life_up_to_date
= 0;
3320 #ifdef OPTIMIZE_MODE_SWITCHING
3321 timevar_push (TV_GCSE
);
3324 if (optimize_mode_switching (NULL
))
3326 /* We did work, and so had to regenerate global life information.
3327 Take advantage of this and don't re-recompute register life
3328 information below. */
3329 register_life_up_to_date
= 1;
3333 timevar_pop (TV_GCSE
);
3336 timevar_push (TV_SCHED
);
3338 #ifdef INSN_SCHEDULING
3340 /* Print function header into sched dump now
3341 because doing the sched analysis makes some of the dump. */
3342 if (optimize
> 0 && flag_schedule_insns
)
3344 open_dump_file (DFI_sched
, decl
);
3346 /* Do control and data sched analysis,
3347 and write some of the results to dump file. */
3349 schedule_insns (rtl_dump_file
);
3351 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3353 /* Register lifetime information was updated as part of verifying
3355 register_life_up_to_date
= 1;
3358 timevar_pop (TV_SCHED
);
3362 /* Determine if the current function is a leaf before running reload
3363 since this can impact optimizations done by the prologue and
3364 epilogue thus changing register elimination offsets. */
3365 current_function_is_leaf
= leaf_function_p ();
3367 timevar_push (TV_LOCAL_ALLOC
);
3368 open_dump_file (DFI_lreg
, decl
);
3370 /* Allocate pseudo-regs that are used only within 1 basic block.
3372 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3373 jump optimizer after register allocation and reloading are finished. */
3375 if (! register_life_up_to_date
)
3376 recompute_reg_usage (insns
, ! optimize_size
);
3377 regclass (insns
, max_reg_num (), rtl_dump_file
);
3378 rebuild_label_notes_after_reload
= local_alloc ();
3380 timevar_pop (TV_LOCAL_ALLOC
);
3382 if (dump_file
[DFI_lreg
].enabled
)
3384 timevar_push (TV_DUMP
);
3386 dump_flow_info (rtl_dump_file
);
3387 dump_local_alloc (rtl_dump_file
);
3389 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3390 timevar_pop (TV_DUMP
);
3395 timevar_push (TV_GLOBAL_ALLOC
);
3396 open_dump_file (DFI_greg
, decl
);
3398 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3399 pass fixing up any insns that are invalid. */
3402 failure
= global_alloc (rtl_dump_file
);
3405 build_insn_chain (insns
);
3406 failure
= reload (insns
, 0);
3409 timevar_pop (TV_GLOBAL_ALLOC
);
3411 if (dump_file
[DFI_greg
].enabled
)
3413 timevar_push (TV_DUMP
);
3415 dump_global_regs (rtl_dump_file
);
3417 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3418 timevar_pop (TV_DUMP
);
3422 goto exit_rest_of_compilation
;
3426 open_dump_file (DFI_postreload
, decl
);
3428 /* Do a very simple CSE pass over just the hard registers. */
3431 timevar_push (TV_RELOAD_CSE_REGS
);
3432 reload_cse_regs (insns
);
3433 timevar_pop (TV_RELOAD_CSE_REGS
);
3436 /* If optimizing, then go ahead and split insns now since we are about
3437 to recompute flow information anyway. */
3440 int old_labelnum
= max_label_num ();
3442 split_all_insns (0);
3443 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3446 /* Register allocation and reloading may have turned an indirect jump into
3447 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3448 jumping instructions. */
3449 if (rebuild_label_notes_after_reload
)
3451 timevar_push (TV_JUMP
);
3453 rebuild_jump_labels (insns
);
3455 timevar_pop (TV_JUMP
);
3458 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3460 /* Re-create the death notes which were deleted during reload. */
3461 timevar_push (TV_FLOW2
);
3462 open_dump_file (DFI_flow2
, decl
);
3464 jump_optimize (insns
, JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3465 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3467 /* On some machines, the prologue and epilogue code, or parts thereof,
3468 can be represented as RTL. Doing so lets us schedule insns between
3469 it and the rest of the code and also allows delayed branch
3470 scheduling to operate in the epilogue. */
3471 thread_prologue_and_epilogue_insns (insns
);
3475 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_CROSSJUMP
);
3476 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3478 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3479 even for machines with possibly nonzero RETURN_POPS_ARGS
3480 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3481 push instructions will have popping returns. */
3482 #ifndef PUSH_ROUNDING
3483 if (!ACCUMULATE_OUTGOING_ARGS
)
3485 combine_stack_adjustments ();
3490 flow2_completed
= 1;
3492 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3493 timevar_pop (TV_FLOW2
);
3495 #ifdef HAVE_peephole2
3496 if (optimize
> 0 && flag_peephole2
)
3498 timevar_push (TV_PEEPHOLE2
);
3499 open_dump_file (DFI_peephole2
, decl
);
3501 peephole2_optimize (rtl_dump_file
);
3503 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3504 timevar_pop (TV_PEEPHOLE2
);
3508 if (optimize
> 0 && flag_rename_registers
)
3510 timevar_push (TV_RENAME_REGISTERS
);
3511 open_dump_file (DFI_rnreg
, decl
);
3513 regrename_optimize ();
3515 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3516 timevar_pop (TV_RENAME_REGISTERS
);
3521 timevar_push (TV_IFCVT2
);
3522 open_dump_file (DFI_ce2
, decl
);
3526 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3527 timevar_pop (TV_IFCVT2
);
3531 split_all_insns (1);
3534 #ifdef INSN_SCHEDULING
3535 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3537 timevar_push (TV_SCHED2
);
3538 open_dump_file (DFI_sched2
, decl
);
3540 /* Do control and data sched analysis again,
3541 and write some more of the results to dump file. */
3543 split_all_insns (1);
3545 schedule_insns (rtl_dump_file
);
3547 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3548 timevar_pop (TV_SCHED2
);
3554 #ifdef LEAF_REGISTERS
3555 current_function_uses_only_leaf_regs
3556 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3560 timevar_push (TV_REG_STACK
);
3561 open_dump_file (DFI_stack
, decl
);
3563 reg_to_stack (insns
, rtl_dump_file
);
3565 close_dump_file (DFI_stack
, print_rtl
, insns
);
3566 timevar_pop (TV_REG_STACK
);
3572 timevar_push (TV_REORDER_BLOCKS
);
3573 open_dump_file (DFI_bbro
, decl
);
3575 /* Last attempt to optimize CFG, as life analyzis possibly removed
3576 some instructions. */
3577 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3578 | CLEANUP_CROSSJUMP
);
3579 if (flag_reorder_blocks
)
3581 reorder_basic_blocks ();
3582 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3585 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3586 timevar_pop (TV_REORDER_BLOCKS
);
3589 /* If a machine dependent reorganization is needed, call it. */
3590 #ifdef MACHINE_DEPENDENT_REORG
3591 open_dump_file (DFI_mach
, decl
);
3593 MACHINE_DEPENDENT_REORG (insns
);
3595 close_dump_file (DFI_mach
, print_rtl
, insns
);
3600 /* CFG no longer kept up to date. */
3602 /* If a scheduling pass for delayed branches is to be done,
3603 call the scheduling code. */
3606 if (optimize
> 0 && flag_delayed_branch
)
3608 timevar_push (TV_DBR_SCHED
);
3609 open_dump_file (DFI_dbr
, decl
);
3611 dbr_schedule (insns
, rtl_dump_file
);
3613 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3614 timevar_pop (TV_DBR_SCHED
);
3620 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3621 timevar_push (TV_SHORTEN_BRANCH
);
3622 split_all_insns (0);
3623 timevar_pop (TV_SHORTEN_BRANCH
);
3626 convert_to_eh_region_ranges ();
3628 /* Shorten branches. */
3629 timevar_push (TV_SHORTEN_BRANCH
);
3630 shorten_branches (get_insns ());
3631 timevar_pop (TV_SHORTEN_BRANCH
);
3633 current_function_nothrow
= nothrow_function_p ();
3634 if (current_function_nothrow
)
3635 /* Now we know that this can't throw; set the flag for the benefit
3636 of other functions later in this translation unit. */
3637 TREE_NOTHROW (current_function_decl
) = 1;
3639 /* Now turn the rtl into assembler code. */
3641 timevar_push (TV_FINAL
);
3646 /* Get the function's name, as described by its RTL. This may be
3647 different from the DECL_NAME name used in the source file. */
3649 x
= DECL_RTL (decl
);
3650 if (GET_CODE (x
) != MEM
)
3653 if (GET_CODE (x
) != SYMBOL_REF
)
3655 fnname
= XSTR (x
, 0);
3657 assemble_start_function (decl
, fnname
);
3658 final_start_function (insns
, asm_out_file
, optimize
);
3659 final (insns
, asm_out_file
, optimize
, 0);
3660 final_end_function ();
3662 #ifdef IA64_UNWIND_INFO
3663 /* ??? The IA-64 ".handlerdata" directive must be issued before
3664 the ".endp" directive that closes the procedure descriptor. */
3665 output_function_exception_table ();
3668 assemble_end_function (decl
, fnname
);
3670 #ifndef IA64_UNWIND_INFO
3671 /* Otherwise, it feels unclean to switch sections in the middle. */
3672 output_function_exception_table ();
3676 fflush (asm_out_file
);
3678 /* Release all memory allocated by flow. */
3679 free_basic_block_vars (0);
3681 /* Release all memory held by regsets now. */
3682 regset_release_memory ();
3684 timevar_pop (TV_FINAL
);
3688 /* Write DBX symbols if requested. */
3690 /* Note that for those inline functions where we don't initially
3691 know for certain that we will be generating an out-of-line copy,
3692 the first invocation of this routine (rest_of_compilation) will
3693 skip over this code by doing a `goto exit_rest_of_compilation;'.
3694 Later on, finish_compilation will call rest_of_compilation again
3695 for those inline functions that need to have out-of-line copies
3696 generated. During that call, we *will* be routed past here. */
3698 timevar_push (TV_SYMOUT
);
3699 (*debug_hooks
->function_decl
) (decl
);
3700 timevar_pop (TV_SYMOUT
);
3702 exit_rest_of_compilation
:
3704 /* In case the function was not output,
3705 don't leave any temporary anonymous types
3706 queued up for sdb output. */
3707 #ifdef SDB_DEBUGGING_INFO
3708 if (write_symbols
== SDB_DEBUG
)
3709 sdbout_types (NULL_TREE
);
3712 reload_completed
= 0;
3713 flow2_completed
= 0;
3716 timevar_push (TV_FINAL
);
3718 /* Clear out the insn_length contents now that they are no
3720 init_insn_lengths ();
3722 /* Clear out the real_constant_chain before some of the rtx's
3723 it runs through become garbage. */
3724 clear_const_double_mem ();
3726 /* Show no temporary slots allocated. */
3729 free_basic_block_vars (0);
3731 timevar_pop (TV_FINAL
);
3733 /* Make sure volatile mem refs aren't considered valid operands for
3734 arithmetic insns. We must call this here if this is a nested inline
3735 function, since the above code leaves us in the init_recog state
3736 (from final.c), and the function context push/pop code does not
3737 save/restore volatile_ok.
3739 ??? Maybe it isn't necessary for expand_start_function to call this
3740 anymore if we do it here? */
3742 init_recog_no_volatile ();
3744 /* We're done with this function. Free up memory if we can. */
3745 free_after_parsing (cfun
);
3746 if (! DECL_DEFER_OUTPUT (decl
))
3747 free_after_compilation (cfun
);
3752 timevar_pop (TV_REST_OF_COMPILATION
);
3762 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3763 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3764 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3765 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3766 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3767 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"));
3769 for (i
= ARRAY_SIZE (f_options
); i
--;)
3771 const char *description
= f_options
[i
].description
;
3773 if (description
!= NULL
&& * description
!= 0)
3774 printf (" -f%-21s %s\n",
3775 f_options
[i
].string
, _(description
));
3778 printf (_(" -O[number] Set optimisation level to [number]\n"));
3779 printf (_(" -Os Optimise for space rather than speed\n"));
3780 for (i
= LAST_PARAM
; i
--;)
3782 const char *description
= compiler_params
[i
].help
;
3783 const int length
= 21-strlen(compiler_params
[i
].option
);
3785 if (description
!= NULL
&& * description
!= 0)
3786 printf (" --param %s=<value>%.*s%s\n",
3787 compiler_params
[i
].option
,
3788 length
> 0 ? length
: 1, " ",
3791 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3792 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3793 printf (_(" -w Suppress warnings\n"));
3794 printf (_(" -W Enable extra warnings\n"));
3796 for (i
= ARRAY_SIZE (W_options
); i
--;)
3798 const char *description
= W_options
[i
].description
;
3800 if (description
!= NULL
&& * description
!= 0)
3801 printf (" -W%-21s %s\n",
3802 W_options
[i
].string
, _(description
));
3805 printf (_(" -Wunused Enable unused warnings\n"));
3806 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3807 printf (_(" -p Enable function profiling\n"));
3808 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3809 printf (_(" -a Enable block profiling \n"));
3811 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3812 printf (_(" -ax Enable jump profiling \n"));
3814 printf (_(" -o <file> Place output into <file> \n"));
3816 -G <number> Put global and static data smaller than <number>\n\
3817 bytes into a special section (on some targets)\n"));
3819 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3821 if (debug_args
[i
].description
!= NULL
)
3822 printf (" -g%-21s %s\n",
3823 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3826 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3827 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3828 printf (_(" -version Display the compiler's version\n"));
3829 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3830 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3831 #if defined INSN_SCHEDULING
3832 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3834 printf (_(" --help Display this information\n"));
3839 /* Display descriptions of language specific options.
3840 If there is no description, note that there is an undocumented option.
3841 If the description is empty, do not display anything. (This allows
3842 options to be deliberately undocumented, for whatever reason).
3843 If the option string is missing, then this is a marker, indicating
3844 that the description string is in fact the name of a language, whose
3845 language specific options are to follow. */
3847 if (ARRAY_SIZE (documented_lang_options
) > 1)
3849 printf (_("\nLanguage specific options:\n"));
3851 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3853 const char *description
= documented_lang_options
[i
].description
;
3854 const char *option
= documented_lang_options
[i
].option
;
3856 if (description
== NULL
)
3861 printf (_(" %-23.23s [undocumented]\n"), option
);
3863 else if (*description
== 0)
3865 else if (option
== NULL
)
3869 (_("\nThere are undocumented %s specific options as well.\n"),
3873 printf (_("\n Options for %s:\n"), description
);
3878 printf (" %-23.23s %s\n", option
, _(description
));
3883 printf (_("\nThere are undocumented %s specific options as well.\n"),
3886 display_target_options ();
3890 display_target_options ()
3894 if (ARRAY_SIZE (target_switches
) > 1
3895 #ifdef TARGET_OPTIONS
3896 || ARRAY_SIZE (target_options
) > 1
3904 printf (_("\nTarget specific options:\n"));
3906 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3908 const char *option
= target_switches
[i
].name
;
3909 const char *description
= target_switches
[i
].description
;
3911 if (option
== NULL
|| *option
== 0)
3913 else if (description
== NULL
)
3918 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3920 else if (* description
!= 0)
3921 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3924 #ifdef TARGET_OPTIONS
3925 for (i
= ARRAY_SIZE (target_options
); i
--;)
3927 const char *option
= target_options
[i
].prefix
;
3928 const char *description
= target_options
[i
].description
;
3930 if (option
== NULL
|| *option
== 0)
3932 else if (description
== NULL
)
3937 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3939 else if (* description
!= 0)
3940 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3946 printf (_("\nThere are undocumented target specific options as well.\n"));
3948 printf (_(" They exist, but they are not documented.\n"));
3953 /* Parse a -d... comand line switch. */
3956 decode_d_option (arg
)
3965 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3966 dump_file
[i
].enabled
= 1;
3972 flag_print_asm_name
= 1;
3975 flag_dump_rtl_in_asm
= 1;
3976 flag_print_asm_name
= 1;
3979 graph_dump_format
= vcg
;
3982 rtl_dump_and_exit
= 1;
3987 case 'D': /* These are handled by the preprocessor. */
3993 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3994 if (c
== dump_file
[i
].debug_switch
)
3996 dump_file
[i
].enabled
= 1;
4001 warning ("unrecognized gcc debugging option: %c", c
);
4006 /* Parse a -f... comand line switch. ARG is the value after the -f.
4007 It is safe to access 'ARG - 2' to generate the full switch name.
4008 Return the number of strings consumed. */
4011 decode_f_option (arg
)
4015 const char *option_value
= NULL
;
4017 /* Search for the option in the table of binary f options. */
4018 for (j
= ARRAY_SIZE (f_options
); j
--;)
4020 if (!strcmp (arg
, f_options
[j
].string
))
4022 *f_options
[j
].variable
= f_options
[j
].on_value
;
4026 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4027 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4029 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4034 if (!strcmp (arg
, "fast-math"))
4035 set_fast_math_flags();
4036 else if (!strcmp (arg
, "no-fast-math"))
4037 set_no_fast_math_flags();
4038 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4039 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4042 read_integral_parameter (option_value
, arg
- 2,
4044 set_param_value ("max-inline-insns", val
);
4046 #ifdef INSN_SCHEDULING
4047 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4048 fix_sched_param ("verbose", option_value
);
4050 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4051 fix_register (option_value
, 1, 1);
4052 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4053 fix_register (option_value
, 0, 1);
4054 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4055 fix_register (option_value
, 0, 0);
4056 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4057 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4058 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4060 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4061 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4062 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4063 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4065 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4066 else if ((option_value
4067 = skip_leading_substring (arg
, "stack-limit-register=")))
4069 int reg
= decode_reg_name (option_value
);
4071 error ("unrecognized register name `%s'", option_value
);
4073 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4075 else if ((option_value
4076 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4079 nm
= ggc_strdup (option_value
);
4080 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4082 else if ((option_value
4083 = skip_leading_substring (arg
, "message-length=")))
4084 output_set_maximum_length
4085 (&global_dc
->buffer
, read_integral_parameter
4086 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4087 else if ((option_value
4088 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4090 if (!strcmp (option_value
, "once"))
4091 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4092 else if (!strcmp (option_value
, "every-line"))
4093 diagnostic_prefixing_rule (global_dc
)
4094 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4096 error ("Unrecognized option `%s'", arg
- 2);
4098 else if (!strcmp (arg
, "no-stack-limit"))
4099 stack_limit_rtx
= NULL_RTX
;
4100 else if (!strcmp (arg
, "preprocessed"))
4101 /* Recognise this switch but do nothing. This prevents warnings
4102 about an unrecognized switch if cpplib has not been linked in. */
4110 /* Parse a -W... comand line switch. ARG is the value after the -W.
4111 It is safe to access 'ARG - 2' to generate the full switch name.
4112 Return the number of strings consumed. */
4115 decode_W_option (arg
)
4118 const char *option_value
= NULL
;
4121 /* Search for the option in the table of binary W options. */
4123 for (j
= ARRAY_SIZE (W_options
); j
--;)
4125 if (!strcmp (arg
, W_options
[j
].string
))
4127 *W_options
[j
].variable
= W_options
[j
].on_value
;
4131 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4132 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4134 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4139 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4140 warning ("-Wid-clash-LEN is no longer supported");
4141 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4143 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4145 warn_larger_than
= larger_than_size
!= -1;
4147 else if (!strcmp (arg
, "unused"))
4151 else if (!strcmp (arg
, "no-unused"))
4161 /* Parse a -g... comand line switch. ARG is the value after the -g.
4162 It is safe to access 'ARG - 2' to generate the full switch name.
4163 Return the number of strings consumed. */
4166 decode_g_option (arg
)
4169 static unsigned level
=0;
4170 /* A lot of code assumes write_symbols == NO_DEBUG if the
4171 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4172 of what debugging type has been selected). This records the
4173 selected type. It is an error to specify more than one
4175 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4176 /* Non-zero if debugging format has been explicitly set.
4177 -g and -ggdb don't explicitly set the debugging format so
4178 -gdwarf -g3 is equivalent to -gdwarf3. */
4179 static int type_explicitly_set_p
= 0;
4180 /* Indexed by enum debug_info_type. */
4181 static const char *debug_type_names
[] =
4183 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4186 /* The maximum admissible debug level value. */
4187 static const unsigned max_debug_level
= 3;
4189 /* Look up ARG in the table. */
4190 for (da
= debug_args
; da
->arg
; da
++)
4192 const int da_len
= strlen (da
->arg
);
4194 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4196 enum debug_info_type type
= da
->debug_type
;
4197 const char *p
= arg
+ da_len
;
4199 if (*p
&& (*p
< '0' || *p
> '9'))
4202 /* A debug flag without a level defaults to level 2.
4203 Note we do not want to call read_integral_parameter
4204 for that case since it will call atoi which
4207 ??? We may want to generalize the interface to
4208 read_integral_parameter to better handle this case
4209 if this case shows up often. */
4211 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4213 level
= (level
== 0) ? 2 : level
;
4215 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4217 error ("use -gdwarf -g%d for DWARF v1, level %d",
4220 error ("use -gdwarf-2 for DWARF v2");
4223 if (level
> max_debug_level
)
4226 ignoring option `%s' due to invalid debug level specification",
4228 level
= debug_info_level
;
4231 if (type
== NO_DEBUG
)
4233 type
= PREFERRED_DEBUGGING_TYPE
;
4235 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4237 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4238 type
= DWARF2_DEBUG
;
4240 #ifdef DBX_DEBUGGING_INFO
4247 if (type
== NO_DEBUG
)
4248 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4250 /* Does it conflict with an already selected type? */
4251 if (type_explicitly_set_p
4252 /* -g/-ggdb don't conflict with anything. */
4253 && da
->debug_type
!= NO_DEBUG
4254 && type
!= selected_debug_type
)
4255 warning ("`%s' ignored, conflicts with `-g%s'",
4256 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4259 /* If the format has already been set, -g/-ggdb
4260 only change the debug level. */
4261 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4262 /* Don't change debugging type. */
4266 selected_debug_type
= type
;
4267 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4270 write_symbols
= (level
== 0
4272 : selected_debug_type
);
4273 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4274 debug_info_level
= (enum debug_info_level
) level
;
4287 /* Decode the first argument in the argv as a language-independent option.
4288 Return the number of strings consumed. */
4291 independent_decode_option (argc
, argv
)
4295 char *arg
= argv
[0];
4297 if (arg
[0] != '-' || arg
[1] == 0)
4309 if (!strcmp (arg
, "-help"))
4312 exit_after_options
= 1;
4315 if (!strcmp (arg
, "-target-help"))
4317 display_target_options ();
4318 exit_after_options
= 1;
4321 if (!strcmp (arg
, "-version"))
4323 print_version (stderr
, "");
4324 exit_after_options
= 1;
4327 /* Handle '--param <name>=<value>'. */
4328 if (strcmp (arg
, "-param") == 0)
4334 error ("-param option missing argument");
4338 /* Get the '<name>=<value>' parameter. */
4340 /* Look for the `='. */
4341 equal
= strchr (arg
, '=');
4343 error ("invalid --param option: %s", arg
);
4348 /* Zero out the `=' sign so that we get two separate strings. */
4350 /* Figure out what value is specified. */
4351 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4352 if (val
!= INVALID_PARAM_VAL
)
4353 set_param_value (arg
, val
);
4355 error ("invalid parameter value `%s'", equal
+ 1);
4370 /* Already been treated in main (). Do nothing. */
4374 set_target_switch (arg
+ 1);
4378 return decode_f_option (arg
+ 1);
4381 return decode_g_option (arg
+ 1);
4384 if (!strcmp (arg
, "dumpbase"))
4389 dump_base_name
= argv
[1];
4393 decode_d_option (arg
+ 1);
4397 if (!strcmp (arg
, "pedantic"))
4399 else if (!strcmp (arg
, "pedantic-errors"))
4400 flag_pedantic_errors
= pedantic
= 1;
4401 else if (arg
[1] == 0)
4408 if (!strcmp (arg
, "quiet"))
4415 if (!strcmp (arg
, "version"))
4423 inhibit_warnings
= 1;
4432 /* We save the value of warn_uninitialized, since if they put
4433 -Wuninitialized on the command line, we need to generate a
4434 warning about not using it without also specifying -O. */
4435 if (warn_uninitialized
!= 1)
4436 warn_uninitialized
= 2;
4439 return decode_W_option (arg
+ 1);
4445 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4446 warning ("`-a' option (basic block profile) not supported");
4448 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4451 else if (!strcmp (arg
, "ax"))
4453 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4454 warning ("`-ax' option (jump profiling) not supported");
4456 profile_block_flag
= (!profile_block_flag
4457 || profile_block_flag
== 2) ? 2 : 3;
4460 else if (!strncmp (arg
, "aux-info", 8))
4467 aux_info_file_name
= argv
[1];
4468 flag_gen_aux_info
= 1;
4471 else if (arg
[8] == '=')
4473 aux_info_file_name
= arg
+ 9;
4474 flag_gen_aux_info
= 1;
4489 asm_file_name
= argv
[1];
4504 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4509 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4513 if (g_switch_val
== -1)
4517 g_switch_set
= TRUE
;
4518 g_switch_value
= g_switch_val
;
4528 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4529 Decode command args, then call compile_file.
4530 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4531 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4533 It is not safe to call this function more than once. */
4536 toplev_main (argc
, argv
)
4543 /* save in case md file wants to emit args as a comment. */
4547 p
= argv
[0] + strlen (argv
[0]);
4548 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4552 xmalloc_set_program_name (progname
);
4554 /* LC_CTYPE determines the character set used by the terminal so it has be set
4555 to output messages correctly. */
4557 #ifdef HAVE_LC_MESSAGES
4558 setlocale (LC_CTYPE
, "");
4559 setlocale (LC_MESSAGES
, "");
4561 setlocale (LC_ALL
, "");
4564 (void) bindtextdomain (PACKAGE
, localedir
);
4565 (void) textdomain (PACKAGE
);
4567 /* Install handler for SIGFPE, which may be received while we do
4568 compile-time floating point arithmetic. */
4569 signal (SIGFPE
, float_signal
);
4571 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4573 signal (SIGSEGV
, crash_signal
);
4576 signal (SIGILL
, crash_signal
);
4579 signal (SIGBUS
, crash_signal
);
4582 signal (SIGABRT
, crash_signal
);
4584 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4585 signal (SIGIOT
, crash_signal
);
4588 decl_printable_name
= decl_name
;
4589 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4591 /* Initialize whether `char' is signed. */
4592 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4593 #ifdef DEFAULT_SHORT_ENUMS
4594 /* Initialize how much space enums occupy, by default. */
4595 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4598 /* Initialize the garbage-collector. */
4601 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4602 ggc_add_tree_root (¤t_function_decl
, 1);
4603 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4605 /* Initialize the diagnostics reporting machinery. */
4606 diagnostic_initialize (global_dc
);
4608 /* Register the language-independent parameters. */
4609 add_params (lang_independent_params
, LAST_PARAM
);
4611 /* Perform language-specific options intialization. */
4612 if (lang_hooks
.init_options
)
4613 (*lang_hooks
.init_options
) ();
4615 /* Scan to see what optimization level has been specified. That will
4616 determine the default value of many flags. */
4617 for (i
= 1; i
< argc
; i
++)
4619 if (!strcmp (argv
[i
], "-O"))
4624 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4626 /* Handle -Os, -O2, -O3, -O69, ... */
4627 char *p
= &argv
[i
][2];
4629 if ((p
[0] == 's') && (p
[1] == 0))
4633 /* Optimizing for size forces optimize to be 2. */
4638 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4639 if (optimize_val
!= -1)
4641 optimize
= optimize_val
;
4651 flag_thread_jumps
= 1;
4653 flag_delayed_branch
= 1;
4655 #ifdef CAN_DEBUG_WITHOUT_FP
4656 flag_omit_frame_pointer
= 1;
4658 flag_guess_branch_prob
= 1;
4663 flag_optimize_sibling_calls
= 1;
4664 flag_cse_follow_jumps
= 1;
4665 flag_cse_skip_blocks
= 1;
4667 flag_expensive_optimizations
= 1;
4668 flag_strength_reduce
= 1;
4669 flag_rerun_cse_after_loop
= 1;
4670 flag_rerun_loop_opt
= 1;
4671 flag_caller_saves
= 1;
4674 #ifdef INSN_SCHEDULING
4675 flag_schedule_insns
= 1;
4676 flag_schedule_insns_after_reload
= 1;
4679 flag_strict_aliasing
= 1;
4680 flag_delete_null_pointer_checks
= 1;
4681 flag_reorder_blocks
= 1;
4686 flag_inline_functions
= 1;
4687 flag_rename_registers
= 1;
4690 if (optimize
< 2 || optimize_size
)
4695 align_functions
= 1;
4698 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4701 set_target_switch ("");
4703 /* Unwind tables are always present in an ABI-conformant IA-64
4704 object file, so the default should be ON. */
4705 #ifdef IA64_UNWIND_INFO
4706 flag_unwind_tables
= IA64_UNWIND_INFO
;
4709 #ifdef OPTIMIZATION_OPTIONS
4710 /* Allow default optimizations to be specified on a per-machine basis. */
4711 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4714 /* Initialize register usage now so switches may override. */
4717 /* Perform normal command line switch decoding. */
4718 for (i
= 1; i
< argc
;)
4721 int indep_processed
;
4723 /* Give the language a chance to decode the option for itself. */
4724 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4726 if (lang_processed
>= 0)
4727 /* Now see if the option also has a language independent meaning.
4728 Some options are both language specific and language independent,
4730 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4733 lang_processed
= -lang_processed
;
4734 indep_processed
= 0;
4737 if (lang_processed
|| indep_processed
)
4738 i
+= MAX (lang_processed
, indep_processed
);
4741 const char *option
= NULL
;
4742 const char *lang
= NULL
;
4745 /* It is possible that the command line switch is not valid for the
4746 current language, but it is valid for another language. In order
4747 to be compatible with previous versions of the compiler (which
4748 did not issue an error message in this case) we check for this
4749 possibility here. If we do find a match, then if extra_warnings
4750 is set we generate a warning message, otherwise we will just
4751 ignore the option. */
4752 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4754 option
= documented_lang_options
[j
].option
;
4757 lang
= documented_lang_options
[j
].description
;
4758 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4762 if (j
!= ARRAY_SIZE (documented_lang_options
))
4766 warning ("Ignoring command line option '%s'", argv
[i
]);
4769 ("(It is valid for %s but not the selected language)",
4773 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4774 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4776 error ("Unrecognized option `%s'", argv
[i
]);
4782 /* All command line options have been processed. */
4783 if (lang_hooks
.post_options
)
4784 (*lang_hooks
.post_options
) ();
4786 if (exit_after_options
)
4789 /* Checker uses the frame pointer. */
4790 if (flag_check_memory_usage
)
4791 flag_omit_frame_pointer
= 0;
4795 /* Inlining does not work if not optimizing,
4796 so force it not to be done. */
4800 /* The c_decode_option function and decode_option hook set
4801 this to `2' if -Wall is used, so we can avoid giving out
4802 lots of errors for people who don't realize what -Wall does. */
4803 if (warn_uninitialized
== 1)
4804 warning ("-Wuninitialized is not supported without -O");
4807 /* We do not currently support sibling-call optimization in the
4808 presence of exceptions. See PR2975 for a test-case that will
4809 fail if we try to combine both of these features. */
4810 if (flag_exceptions
)
4811 flag_optimize_sibling_calls
= 0;
4813 #ifdef OVERRIDE_OPTIONS
4814 /* Some machines may reject certain combinations of options. */
4818 /* Set up the align_*_log variables, defaulting them to 1 if they
4819 were still unset. */
4820 if (align_loops
<= 0) align_loops
= 1;
4821 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4822 if (align_jumps
<= 0) align_jumps
= 1;
4823 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4824 if (align_labels
<= 0) align_labels
= 1;
4825 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4826 if (align_functions
<= 0) align_functions
= 1;
4827 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4829 if (profile_block_flag
== 3)
4831 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4832 profile_block_flag
= 2;
4835 /* Unrolling all loops implies that standard loop unrolling must also
4837 if (flag_unroll_all_loops
)
4838 flag_unroll_loops
= 1;
4839 /* Loop unrolling requires that strength_reduction be on also. Silently
4840 turn on strength reduction here if it isn't already on. Also, the loop
4841 unrolling code assumes that cse will be run after loop, so that must
4842 be turned on also. */
4843 if (flag_unroll_loops
)
4845 flag_strength_reduce
= 1;
4846 flag_rerun_cse_after_loop
= 1;
4849 /* Warn about options that are not supported on this machine. */
4850 #ifndef INSN_SCHEDULING
4851 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4852 warning ("instruction scheduling not supported on this target machine");
4855 if (flag_delayed_branch
)
4856 warning ("this target machine does not have delayed branches");
4859 /* Some operating systems do not allow profiling without a frame
4861 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4863 && flag_omit_frame_pointer
)
4865 error ("profiling does not work without a frame pointer");
4866 flag_omit_frame_pointer
= 0;
4869 user_label_prefix
= USER_LABEL_PREFIX
;
4870 if (flag_leading_underscore
!= -1)
4872 /* If the default prefix is more complicated than "" or "_",
4873 issue a warning and ignore this option. */
4874 if (user_label_prefix
[0] == 0 ||
4875 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4877 user_label_prefix
= flag_leading_underscore
? "_" : "";
4880 warning ("-f%sleading-underscore not supported on this target machine",
4881 flag_leading_underscore
? "" : "no-");
4884 /* If we are in verbose mode, write out the version and maybe all the
4885 option flags in use. */
4888 print_version (stderr
, "");
4890 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4893 compile_file (filename
);
4896 return (FATAL_EXIT_CODE
);
4898 return (FATAL_EXIT_CODE
);
4899 return (SUCCESS_EXIT_CODE
);
4902 /* Decode -m switches. */
4903 /* Decode the switch -mNAME. */
4906 set_target_switch (name
)
4910 int valid_target_option
= 0;
4912 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4913 if (!strcmp (target_switches
[j
].name
, name
))
4915 if (target_switches
[j
].value
< 0)
4916 target_flags
&= ~-target_switches
[j
].value
;
4918 target_flags
|= target_switches
[j
].value
;
4919 valid_target_option
= 1;
4922 #ifdef TARGET_OPTIONS
4923 if (!valid_target_option
)
4924 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4926 int len
= strlen (target_options
[j
].prefix
);
4927 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4929 *target_options
[j
].variable
= name
+ len
;
4930 valid_target_option
= 1;
4935 if (!valid_target_option
)
4936 error ("Invalid option `%s'", name
);
4939 /* Print version information to FILE.
4940 Each line begins with INDENT (for the case where FILE is the
4941 assembler output file). */
4944 print_version (file
, indent
)
4949 #define __VERSION__ "[?]"
4953 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4955 "%s%s%s version %s (%s) compiled by CC.\n"
4957 , indent
, *indent
!= 0 ? " " : "",
4958 language_string
, version_string
, TARGET_NAME
,
4959 indent
, __VERSION__
);
4962 /* Print an option value and return the adjusted position in the line.
4963 ??? We don't handle error returns from fprintf (disk full); presumably
4964 other code will catch a disk full though. */
4967 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4970 const char *indent
, *sep
, *term
, *type
, *name
;
4972 /* The ultrix fprintf returns 0 on success, so compute the result we want
4973 here since we need it for the following test. */
4974 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4979 fprintf (file
, "%s", term
);
4984 fprintf (file
, "%s", indent
);
4985 pos
= strlen (indent
);
4987 fprintf (file
, "%s%s%s", sep
, type
, name
);
4992 /* Print active target switches to FILE.
4993 POS is the current cursor position and MAX is the size of a "line".
4994 Each line begins with INDENT and ends with TERM.
4995 Each switch is separated from the next by SEP. */
4998 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5001 const char *indent
, *sep
, *term
;
5006 /* Print the options as passed. */
5008 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5009 _("options passed: "), "");
5011 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5015 if (strcmp (*p
, "-o") == 0)
5021 if (strcmp (*p
, "-quiet") == 0)
5023 if (strcmp (*p
, "-version") == 0)
5028 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5031 fprintf (file
, "%s", term
);
5033 /* Print the -f and -m options that have been enabled.
5034 We don't handle language specific options but printing argv
5037 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5038 _("options enabled: "), "");
5040 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5041 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5042 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5043 "-f", f_options
[j
].string
);
5045 /* Print target specific options. */
5047 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5048 if (target_switches
[j
].name
[0] != '\0'
5049 && target_switches
[j
].value
> 0
5050 && ((target_switches
[j
].value
& target_flags
)
5051 == target_switches
[j
].value
))
5053 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5054 "-m", target_switches
[j
].name
);
5057 #ifdef TARGET_OPTIONS
5058 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5059 if (*target_options
[j
].variable
!= NULL
)
5062 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5063 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5064 prefix
, *target_options
[j
].variable
);
5068 fprintf (file
, "%s", term
);