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
83 #ifdef XCOFF_DEBUGGING_INFO
84 #include "xcoffout.h" /* Needed for external data
85 declarations for e.g. AIX 4.x. */
89 /* The extra parameters substantially improve the I/O performance. */
92 vms_fopen (fname
, type
)
96 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
97 fixed arguments, which matches ANSI's specification but not VAXCRTL's
98 pre-ANSI implementation. This hack circumvents the mismatch problem. */
99 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
102 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
103 "deq=64", "fop=tef", "shr=nil");
105 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
108 #define fopen vms_fopen
111 #ifndef DEFAULT_GDB_EXTENSIONS
112 #define DEFAULT_GDB_EXTENSIONS 1
115 /* If more than one debugging type is supported, you must define
116 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
118 This is one long line cause VAXC can't handle a \-newline. */
119 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
120 #ifndef PREFERRED_DEBUGGING_TYPE
121 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
122 #endif /* no PREFERRED_DEBUGGING_TYPE */
123 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
124 so the following code needn't care. */
125 #ifdef DBX_DEBUGGING_INFO
126 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
128 #ifdef SDB_DEBUGGING_INFO
129 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
131 #ifdef DWARF_DEBUGGING_INFO
132 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
134 #ifdef DWARF2_DEBUGGING_INFO
135 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
137 #ifdef XCOFF_DEBUGGING_INFO
138 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
140 #endif /* More than one debugger format enabled. */
142 /* If still not defined, must have been because no debugging formats
144 #ifndef PREFERRED_DEBUGGING_TYPE
145 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
148 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
149 extern char **environ
;
152 /* Carry information from ASM_DECLARE_OBJECT_NAME
153 to ASM_FINISH_DECLARE_OBJECT. */
155 extern int size_directive_output
;
156 extern tree last_assemble_variable_decl
;
158 static void set_target_switch
PARAMS ((const char *));
159 static const char *decl_name
PARAMS ((tree
, int));
161 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
162 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
163 static void compile_file
PARAMS ((const char *));
164 static void display_help
PARAMS ((void));
165 static void display_target_options
PARAMS ((void));
167 static void decode_d_option
PARAMS ((const char *));
168 static int decode_f_option
PARAMS ((const char *));
169 static int decode_W_option
PARAMS ((const char *));
170 static int decode_g_option
PARAMS ((const char *));
171 static unsigned int independent_decode_option
PARAMS ((int, char **));
173 static void print_version
PARAMS ((FILE *, const char *));
174 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
175 const char *, const char *,
176 const char *, const char *));
177 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
178 const char *, const char *));
180 /* Length of line when printing switch values. */
183 /* Name of program invoked, sans directories. */
185 const char *progname
;
187 /* Copy of arguments to toplev_main. */
191 /* Name of current original source file (what was input to cpp).
192 This comes from each #-command in the actual input. */
194 const char *input_filename
;
196 /* Name of top-level original source file (what was input to cpp).
197 This comes from the #-command at the beginning of the actual input.
198 If there isn't any there, then this is the cc1 input file name. */
200 const char *main_input_filename
;
202 /* Current line number in real source file. */
206 /* Nonzero if it is unsafe to create any new pseudo registers. */
209 /* Stack of currently pending input files. */
211 struct file_stack
*input_file_stack
;
213 /* Incremented on each change to input_file_stack. */
214 int input_file_stack_tick
;
216 /* Name to use as base of names for dump output files. */
218 const char *dump_base_name
;
220 /* Bit flags that specify the machine subtype we are compiling for.
221 Bits are tested using macros TARGET_... defined in the tm.h file
222 and set by `-m...' switches. Must be defined in rtlanal.c. */
224 extern int target_flags
;
226 /* Debug hooks - dependent upon command line options. */
228 struct gcc_debug_hooks
*debug_hooks
;
230 /* Describes a dump file. */
232 struct dump_file_info
234 /* The unique extension to apply, e.g. ".jump". */
235 const char *const extension
;
237 /* The -d<c> character that enables this dump file. */
238 char const debug_switch
;
240 /* True if there is a corresponding graph dump file. */
241 char const graph_dump_p
;
243 /* True if the user selected this dump. */
246 /* True if the files have been initialized (ie truncated). */
250 /* Enumerate the extant dump files. */
289 /* Describes all the dump files. Should be kept in order of the
290 pass and in sync with dump_file_index above.
292 Remaining -d letters:
298 struct dump_file_info dump_file
[DFI_MAX
] =
300 { "rtl", 'r', 0, 0, 0 },
301 { "sibling", 'i', 0, 0, 0 },
302 { "eh", 'h', 0, 0, 0 },
303 { "jump", 'j', 0, 0, 0 },
304 { "ssa", 'e', 1, 0, 0 },
305 { "ssaccp", 'W', 1, 0, 0 },
306 { "ssadce", 'X', 1, 0, 0 },
307 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
308 { "cse", 's', 0, 0, 0 },
309 { "addressof", 'F', 0, 0, 0 },
310 { "gcse", 'G', 1, 0, 0 },
311 { "loop", 'L', 1, 0, 0 },
312 { "cse2", 't', 1, 0, 0 },
313 { "cfg", 'f', 1, 0, 0 },
314 { "bp", 'b', 1, 0, 0 },
315 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
316 { "combine", 'c', 1, 0, 0 },
317 { "ce", 'C', 1, 0, 0 },
318 { "regmove", 'N', 1, 0, 0 },
319 { "sched", 'S', 1, 0, 0 },
320 { "lreg", 'l', 1, 0, 0 },
321 { "greg", 'g', 1, 0, 0 },
322 { "postreload", 'o', 1, 0, 0 },
323 { "flow2", 'w', 1, 0, 0 },
324 { "peephole2", 'z', 1, 0, 0 },
325 { "rnreg", 'n', 1, 0, 0 },
326 { "ce2", 'E', 1, 0, 0 },
327 { "sched2", 'R', 1, 0, 0 },
328 { "stack", 'k', 1, 0, 0 },
329 { "bbro", 'B', 1, 0, 0 },
330 { "mach", 'M', 1, 0, 0 },
331 { "dbr", 'd', 0, 0, 0 },
334 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
335 static void close_dump_file
PARAMS ((enum dump_file_index
,
336 void (*) (FILE *, rtx
), rtx
));
338 /* Other flags saying which kinds of debugging dump have been requested. */
340 int rtl_dump_and_exit
;
341 int flag_print_asm_name
;
342 static int version_flag
;
343 static char *filename
;
344 enum graph_dump_types graph_dump_format
;
346 /* Name for output file of assembly code, specified with -o. */
350 /* Value of the -G xx switch, and whether it was passed or not. */
354 /* Type(s) of debugging information we are producing (if any).
355 See flags.h for the definitions of the different possible
356 types of debugging information. */
357 enum debug_info_type write_symbols
= NO_DEBUG
;
359 /* Level of debugging information we are producing. See flags.h
360 for the definitions of the different possible levels. */
361 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
363 /* Nonzero means use GNU-only extensions in the generated symbolic
364 debugging information. */
365 /* Currently, this only has an effect when write_symbols is set to
366 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
367 int use_gnu_debug_info_extensions
= 0;
369 /* Nonzero means do optimizations. -O.
370 Particular numeric values stand for particular amounts of optimization;
371 thus, -O2 stores 2 here. However, the optimizations beyond the basic
372 ones are not controlled directly by this variable. Instead, they are
373 controlled by individual `flag_...' variables that are defaulted
374 based on this variable. */
378 /* Nonzero means optimize for size. -Os.
379 The only valid values are zero and non-zero. When optimize_size is
380 non-zero, optimize defaults to 2, but certain individual code
381 bloating optimizations are disabled. */
383 int optimize_size
= 0;
385 /* Nonzero if we should exit after parsing options. */
386 static int exit_after_options
= 0;
388 /* The FUNCTION_DECL for the function currently being compiled,
389 or 0 if between functions. */
390 tree current_function_decl
;
392 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
394 tree current_function_func_begin_label
;
396 /* Pointer to function to compute the name to use to print a declaration.
397 DECL is the declaration in question.
398 VERBOSITY determines what information will be printed:
399 0: DECL_NAME, demangled as necessary.
400 1: and scope information.
401 2: and any other information that might be interesting, such as function
402 parameter types in C++. */
404 const char *(*decl_printable_name
) PARAMS ((tree
, int));
406 /* Pointer to function to compute rtl for a language-specific tree code. */
408 typedef rtx (*lang_expand_expr_t
)
409 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
410 enum expand_modifier modifier
));
412 lang_expand_expr_t lang_expand_expr
= 0;
414 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
416 /* Pointer to function to finish handling an incomplete decl at the
417 end of compilation. */
419 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
421 /* Nonzero if doing dwarf2 duplicate elimination. */
423 int flag_eliminate_dwarf2_dups
= 0;
425 /* Nonzero if generating code to do profiling. */
427 int profile_flag
= 0;
429 /* Nonzero if generating code to do profiling on a line-by-line basis. */
431 int profile_block_flag
;
433 /* Nonzero if generating code to profile program flow graph arcs. */
435 int profile_arc_flag
= 0;
437 /* Nonzero if generating info for gcov to calculate line test coverage. */
439 int flag_test_coverage
= 0;
441 /* Nonzero indicates that branch taken probabilities should be calculated. */
443 int flag_branch_probabilities
= 0;
445 /* Nonzero if basic blocks should be reordered. */
447 int flag_reorder_blocks
= 0;
449 /* Nonzero if registers should be renamed. */
451 int flag_rename_registers
= 0;
453 /* Nonzero for -pedantic switch: warn about anything
454 that standard spec forbids. */
458 /* Temporarily suppress certain warnings.
459 This is set while reading code from a system header file. */
461 int in_system_header
= 0;
463 /* Don't print functions as they are compiled. -quiet. */
467 /* Print times taken by the various passes. -ftime-report. */
471 /* Print memory still in use at end of compilation (which may have little
472 to do with peak memory consumption). -fmem-report. */
476 /* Non-zero means to collect statistics which might be expensive
477 and to print them when we are done. */
478 int flag_detailed_statistics
= 0;
483 /* Nonzero means `char' should be signed. */
485 int flag_signed_char
;
487 /* Nonzero means give an enum type only as many bytes as it needs. */
489 int flag_short_enums
;
491 /* Nonzero for -fcaller-saves: allocate values in regs that need to
492 be saved across function calls, if that produces overall better code.
493 Optional now, so people can test it. */
495 #ifdef DEFAULT_CALLER_SAVES
496 int flag_caller_saves
= 1;
498 int flag_caller_saves
= 0;
501 /* Nonzero if structures and unions should be returned in memory.
503 This should only be defined if compatibility with another compiler or
504 with an ABI is needed, because it results in slower code. */
506 #ifndef DEFAULT_PCC_STRUCT_RETURN
507 #define DEFAULT_PCC_STRUCT_RETURN 1
510 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
512 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
514 /* Nonzero for -fforce-mem: load memory value into a register
515 before arithmetic on it. This makes better cse but slower compilation. */
517 int flag_force_mem
= 0;
519 /* Nonzero for -fforce-addr: load memory address into a register before
520 reference to memory. This makes better cse but slower compilation. */
522 int flag_force_addr
= 0;
524 /* Nonzero for -fdefer-pop: don't pop args after each function call;
525 instead save them up to pop many calls' args with one insns. */
527 int flag_defer_pop
= 0;
529 /* Nonzero for -ffloat-store: don't allocate floats and doubles
530 in extended-precision registers. */
532 int flag_float_store
= 0;
534 /* Nonzero for -fcse-follow-jumps:
535 have cse follow jumps to do a more extensive job. */
537 int flag_cse_follow_jumps
;
539 /* Nonzero for -fcse-skip-blocks:
540 have cse follow a branch around a block. */
541 int flag_cse_skip_blocks
;
543 /* Nonzero for -fexpensive-optimizations:
544 perform miscellaneous relatively-expensive optimizations. */
545 int flag_expensive_optimizations
;
547 /* Nonzero for -fthread-jumps:
548 have jump optimize output of loop. */
550 int flag_thread_jumps
;
552 /* Nonzero enables strength-reduction in loop.c. */
554 int flag_strength_reduce
= 0;
556 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
557 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
558 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
561 int flag_unroll_loops
;
563 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
564 This is generally not a win. */
566 int flag_unroll_all_loops
;
568 /* Nonzero forces all invariant computations in loops to be moved
571 int flag_move_all_movables
= 0;
573 /* Nonzero forces all general induction variables in loops to be
576 int flag_reduce_all_givs
= 0;
578 /* Nonzero to perform full register move optimization passes. This is the
581 int flag_regmove
= 0;
583 /* Nonzero for -fwritable-strings:
584 store string constants in data segment and don't uniquize them. */
586 int flag_writable_strings
= 0;
588 /* Nonzero means don't put addresses of constant functions in registers.
589 Used for compiling the Unix kernel, where strange substitutions are
590 done on the assembly output. */
592 int flag_no_function_cse
= 0;
594 /* Nonzero for -fomit-frame-pointer:
595 don't make a frame pointer in simple functions that don't require one. */
597 int flag_omit_frame_pointer
= 0;
599 /* Nonzero means place each function into its own section on those platforms
600 which support arbitrary section names and unlimited numbers of sections. */
602 int flag_function_sections
= 0;
604 /* ... and similar for data. */
606 int flag_data_sections
= 0;
608 /* Nonzero to inhibit use of define_optimization peephole opts. */
610 int flag_no_peephole
= 0;
612 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
614 int flag_optimize_sibling_calls
= 0;
616 /* Nonzero means the front end generally wants `errno' maintained by math
617 operations, like built-in SQRT. */
619 int flag_errno_math
= 1;
621 /* Nonzero means that unsafe floating-point math optimizations are allowed
622 for the sake of speed. IEEE compliance is not guaranteed, and operations
623 are allowed to assume that their arguments and results are "normal"
624 (e.g., nonnegative for SQRT). */
626 int flag_unsafe_math_optimizations
= 0;
628 /* Zero means that floating-point math operations cannot generate a
629 (user-visible) trap. This is the case, for example, in nonstop
630 IEEE 754 arithmetic. */
632 int flag_trapping_math
= 1;
634 /* 0 means straightforward implementation of complex divide acceptable.
635 1 means wide ranges of inputs must work for complex divide.
636 2 means C99-like requirements for complex divide (not yet implemented). */
638 int flag_complex_divide_method
= 0;
640 /* Nonzero means all references through pointers are volatile. */
644 /* Nonzero means treat all global and extern variables as volatile. */
646 int flag_volatile_global
;
648 /* Nonzero means treat all static variables as volatile. */
650 int flag_volatile_static
;
652 /* Nonzero means just do syntax checking; don't output anything. */
654 int flag_syntax_only
= 0;
656 /* Nonzero means perform global cse. */
658 static int flag_gcse
;
660 /* Nonzero means to use global dataflow analysis to eliminate
661 useless null pointer tests. */
663 static int flag_delete_null_pointer_checks
;
665 /* Nonzero means to do the enhanced load motion during gcse, which trys
666 to hoist loads by not killing them when a store to the same location
669 int flag_gcse_lm
= 1;
671 /* Nonzero means to perform store motion after gcse, which will try to
672 move stores closer to the exit block. Its not very effective without
675 int flag_gcse_sm
= 1;
677 /* Nonzero means to rerun cse after loop optimization. This increases
678 compilation time about 20% and picks up a few more common expressions. */
680 static int flag_rerun_cse_after_loop
;
682 /* Nonzero means to run loop optimizations twice. */
684 int flag_rerun_loop_opt
;
686 /* Nonzero for -finline-functions: ok to inline functions that look like
687 good inline candidates. */
689 int flag_inline_functions
;
691 /* Nonzero for -fkeep-inline-functions: even if we make a function
692 go inline everywhere, keep its definition around for debugging
695 int flag_keep_inline_functions
;
697 /* Nonzero means that functions will not be inlined. */
701 /* Nonzero means that we should emit static const variables
702 regardless of whether or not optimization is turned on. */
704 int flag_keep_static_consts
= 1;
706 /* Nonzero means we should be saving declaration info into a .X file. */
708 int flag_gen_aux_info
= 0;
710 /* Specified name of aux-info file. */
712 static char *aux_info_file_name
;
714 /* Nonzero means make the text shared if supported. */
716 int flag_shared_data
;
718 /* Nonzero means schedule into delayed branch slots if supported. */
720 int flag_delayed_branch
;
722 /* Nonzero if we are compiling pure (sharable) code.
723 Value is 1 if we are doing reasonable (i.e. simple
724 offset into offset table) pic. Value is 2 if we can
725 only perform register offsets. */
729 /* Nonzero means generate extra code for exception handling and enable
730 exception handling. */
734 /* Nonzero means generate frame unwind info table when supported. */
736 int flag_unwind_tables
= 0;
738 /* Nonzero means don't place uninitialized global data in common storage
743 /* Nonzero means pretend it is OK to examine bits of target floats,
744 even if that isn't true. The resulting code will have incorrect constants,
745 but the same series of instructions that the native compiler would make. */
747 int flag_pretend_float
;
749 /* Nonzero means change certain warnings into errors.
750 Usually these are warnings about failure to conform to some standard. */
752 int flag_pedantic_errors
= 0;
754 /* flag_schedule_insns means schedule insns within basic blocks (before
756 flag_schedule_insns_after_reload means schedule insns after
759 int flag_schedule_insns
= 0;
760 int flag_schedule_insns_after_reload
= 0;
762 /* The following flags have effect only for scheduling before register
765 flag_schedule_interblock means schedule insns accross basic blocks.
766 flag_schedule_speculative means allow speculative motion of non-load insns.
767 flag_schedule_speculative_load means allow speculative motion of some
769 flag_schedule_speculative_load_dangerous allows speculative motion of more
772 int flag_schedule_interblock
= 1;
773 int flag_schedule_speculative
= 1;
774 int flag_schedule_speculative_load
= 0;
775 int flag_schedule_speculative_load_dangerous
= 0;
777 int flag_single_precision_constant
;
779 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
780 by a cheaper branch on a count register. */
781 int flag_branch_on_count_reg
= 1;
783 /* -finhibit-size-directive inhibits output of .size for ELF.
784 This is used only for compiling crtstuff.c,
785 and it may be extended to other effects
786 needed for crtstuff.c on other systems. */
787 int flag_inhibit_size_directive
= 0;
789 /* -fverbose-asm causes extra commentary information to be produced in
790 the generated assembly code (to make it more readable). This option
791 is generally only of use to those who actually need to read the
792 generated assembly code (perhaps while debugging the compiler itself).
793 -fno-verbose-asm, the default, causes the extra information
794 to be omitted and is useful when comparing two assembler files. */
796 int flag_verbose_asm
= 0;
798 /* -dA causes debug commentary information to be produced in
799 the generated assembly code (to make it more readable). This option
800 is generally only of use to those who actually need to read the
801 generated assembly code (perhaps while debugging the compiler itself).
802 Currently, this switch is only used by dwarfout.c; however, it is intended
803 to be a catchall for printing debug information in the assembler file. */
805 int flag_debug_asm
= 0;
807 /* -dP causes the rtl to be emitted as a comment in assembly. */
809 int flag_dump_rtl_in_asm
= 0;
811 /* -fgnu-linker specifies use of the GNU linker for initializations.
812 (Or, more generally, a linker that handles initializations.)
813 -fno-gnu-linker says that collect2 will be used. */
815 int flag_gnu_linker
= 0;
817 int flag_gnu_linker
= 1;
823 /* Enable ssa conditional constant propagation. */
824 int flag_ssa_ccp
= 0;
826 /* Enable ssa aggressive dead code elimination. */
827 int flag_ssa_dce
= 0;
829 /* Tag all structures with __attribute__(packed). */
830 int flag_pack_struct
= 0;
832 /* Emit code to check for stack overflow; also may cause large objects
833 to be allocated dynamically. */
834 int flag_stack_check
;
836 /* When non-NULL, indicates that whenever space is allocated on the
837 stack, the resulting stack pointer must not pass this
838 address---that is, for stacks that grow downward, the stack pointer
839 must always be greater than or equal to this address; for stacks
840 that grow upward, the stack pointer must be less than this address.
841 At present, the rtx may be either a REG or a SYMBOL_REF, although
842 the support provided depends on the backend. */
845 /* -fcheck-memory-usage causes extra code to be generated in order to check
846 memory accesses. This is used by a detector of bad memory accesses such
848 int flag_check_memory_usage
= 0;
850 /* -fprefix-function-name causes function name to be prefixed. This
851 can be used with -fcheck-memory-usage to isolate code compiled with
852 -fcheck-memory-usage. */
853 int flag_prefix_function_name
= 0;
855 /* 0 if pointer arguments may alias each other. True in C.
856 1 if pointer arguments may not alias each other but may alias
858 2 if pointer arguments may not alias each other and may not
859 alias global variables. True in Fortran.
860 This defaults to 0 for C. */
861 int flag_argument_noalias
= 0;
863 /* Nonzero if we should do (language-dependent) alias analysis.
864 Typically, this analysis will assume that expressions of certain
865 types do not alias expressions of certain other types. Only used
866 if alias analysis (in general) is enabled. */
867 int flag_strict_aliasing
= 0;
869 /* Instrument functions with calls at entry and exit, for profiling. */
870 int flag_instrument_function_entry_exit
= 0;
872 /* Nonzero means ignore `#ident' directives. 0 means handle them.
873 On SVR4 targets, it also controls whether or not to emit a
874 string identifying the compiler. */
876 int flag_no_ident
= 0;
878 /* This will perform a peephole pass before sched2. */
879 int flag_peephole2
= 0;
881 /* This will try to guess branch probabilities. */
882 int flag_guess_branch_prob
= 0;
884 /* -fbounded-pointers causes gcc to compile pointers as composite
885 objects occupying three words: the pointer value, the base address
886 of the referent object, and the address immediately beyond the end
887 of the referent object. The base and extent allow us to perform
888 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
889 int flag_bounded_pointers
= 0;
891 /* -fcheck-bounds causes gcc to generate array bounds checks.
892 For C, C++: defaults to value of flag_bounded_pointers.
893 For ObjC: defaults to off.
894 For Java: defaults to on.
895 For Fortran: defaults to off.
896 For CHILL: defaults to off. */
897 int flag_bounds_check
= 0;
899 /* If one, renumber instruction UIDs to reduce the number of
900 unused UIDs if there are a lot of instructions. If greater than
901 one, unconditionally renumber instruction UIDs. */
902 int flag_renumber_insns
= 1;
904 /* Values of the -falign-* flags: how much to align labels in code.
905 0 means `use default', 1 means `don't align'.
906 For each variable, there is an _log variant which is the power
907 of two not less than the variable, for .align output. */
914 int align_labels_log
;
916 int align_functions_log
;
918 /* Table of supported debugging formats. */
922 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
923 constant expression, we use NO_DEBUG in its place. */
924 enum debug_info_type debug_type
;
925 int use_extensions_p
;
926 const char *description
;
930 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
931 N_("Generate debugging info in default format") },
932 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
933 #ifdef DBX_DEBUGGING_INFO
934 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
935 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
937 #ifdef DWARF_DEBUGGING_INFO
938 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
939 { "dwarf+", DWARF_DEBUG
, 1,
940 N_("Generate extended DWARF-1 format debug info") },
942 #ifdef DWARF2_DEBUGGING_INFO
943 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
945 #ifdef XCOFF_DEBUGGING_INFO
946 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
947 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
949 #ifdef SDB_DEBUGGING_INFO
950 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
960 const char *description
;
962 lang_independent_options
;
966 /* Add or remove a leading underscore from user symbols. */
967 int flag_leading_underscore
= -1;
969 /* The user symbol prefix after having resolved same. */
970 const char *user_label_prefix
;
972 static const param_info lang_independent_params
[] = {
973 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
974 { OPTION, DEFAULT, HELP },
975 #include "params.def"
980 /* A default for same. */
981 #ifndef USER_LABEL_PREFIX
982 #define USER_LABEL_PREFIX ""
985 /* Table of language-independent -f options.
986 STRING is the option name. VARIABLE is the address of the variable.
987 ON_VALUE is the value to store in VARIABLE
988 if `-fSTRING' is seen as an option.
989 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
991 lang_independent_options f_options
[] =
993 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
994 N_("Perform DWARF2 duplicate elimination") },
995 {"float-store", &flag_float_store
, 1,
996 N_("Do not store floats in registers") },
997 {"volatile", &flag_volatile
, 1,
998 N_("Consider all mem refs through pointers as volatile") },
999 {"volatile-global", &flag_volatile_global
, 1,
1000 N_("Consider all mem refs to global data to be volatile") },
1001 {"volatile-static", &flag_volatile_static
, 1,
1002 N_("Consider all mem refs to static data to be volatile") },
1003 {"defer-pop", &flag_defer_pop
, 1,
1004 N_("Defer popping functions args from stack until later") },
1005 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1006 N_("When possible do not generate stack frames") },
1007 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1008 N_("Optimize sibling and tail recursive calls") },
1009 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1010 N_("When running CSE, follow jumps to their targets") },
1011 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1012 N_("When running CSE, follow conditional jumps") },
1013 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1014 N_("Perform a number of minor, expensive optimisations") },
1015 {"thread-jumps", &flag_thread_jumps
, 1,
1016 N_("Perform jump threading optimisations") },
1017 {"strength-reduce", &flag_strength_reduce
, 1,
1018 N_("Perform strength reduction optimisations") },
1019 {"unroll-loops", &flag_unroll_loops
, 1,
1020 N_("Perform loop unrolling when iteration count is known") },
1021 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1022 N_("Perform loop unrolling for all loops") },
1023 {"move-all-movables", &flag_move_all_movables
, 1,
1024 N_("Force all loop invariant computations out of loops") },
1025 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1026 N_("Strength reduce all loop general induction variables") },
1027 {"writable-strings", &flag_writable_strings
, 1,
1028 N_("Store strings in writable data section") },
1029 {"peephole", &flag_no_peephole
, 0,
1030 N_("Enable machine specific peephole optimisations") },
1031 {"force-mem", &flag_force_mem
, 1,
1032 N_("Copy memory operands into registers before using") },
1033 {"force-addr", &flag_force_addr
, 1,
1034 N_("Copy memory address constants into regs before using") },
1035 {"function-cse", &flag_no_function_cse
, 0,
1036 N_("Allow function addresses to be held in registers") },
1037 {"inline-functions", &flag_inline_functions
, 1,
1038 N_("Integrate simple functions into their callers") },
1039 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1040 N_("Generate code for funcs even if they are fully inlined") },
1041 {"inline", &flag_no_inline
, 0,
1042 N_("Pay attention to the 'inline' keyword") },
1043 {"keep-static-consts", &flag_keep_static_consts
, 1,
1044 N_("Emit static const variables even if they are not used") },
1045 {"syntax-only", &flag_syntax_only
, 1,
1046 N_("Check for syntax errors, then stop") },
1047 {"shared-data", &flag_shared_data
, 1,
1048 N_("Mark data as shared rather than private") },
1049 {"caller-saves", &flag_caller_saves
, 1,
1050 N_("Enable saving registers around function calls") },
1051 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1052 N_("Return 'short' aggregates in memory, not registers") },
1053 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1054 N_("Return 'short' aggregates in registers") },
1055 {"delayed-branch", &flag_delayed_branch
, 1,
1056 N_("Attempt to fill delay slots of branch instructions") },
1057 {"gcse", &flag_gcse
, 1,
1058 N_("Perform the global common subexpression elimination") },
1059 {"gcse-lm", &flag_gcse_lm
, 1,
1060 N_("Perform enhanced load motion during global subexpression elimination") },
1061 {"gcse-sm", &flag_gcse_sm
, 1,
1062 N_("Perform store motion after global subexpression elimination") },
1063 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1064 N_("Run CSE pass after loop optimisations") },
1065 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1066 N_("Run the loop optimiser twice") },
1067 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1068 N_("Delete useless null pointer checks") },
1069 {"pretend-float", &flag_pretend_float
, 1,
1070 N_("Pretend that host and target use the same FP format") },
1071 {"schedule-insns", &flag_schedule_insns
, 1,
1072 N_("Reschedule instructions before register allocation") },
1073 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1074 N_("Reschedule instructions after register allocation") },
1075 {"sched-interblock",&flag_schedule_interblock
, 1,
1076 N_("Enable scheduling across basic blocks") },
1077 {"sched-spec",&flag_schedule_speculative
, 1,
1078 N_("Allow speculative motion of non-loads") },
1079 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1080 N_("Allow speculative motion of some loads") },
1081 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1082 N_("Allow speculative motion of more loads") },
1083 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1084 N_("Replace add,compare,branch with branch on count reg") },
1085 {"pic", &flag_pic
, 1,
1086 N_("Generate position independent code, if possible") },
1087 {"PIC", &flag_pic
, 2, ""},
1088 {"exceptions", &flag_exceptions
, 1,
1089 N_("Enable exception handling") },
1090 {"unwind-tables", &flag_unwind_tables
, 1,
1091 N_("Just generate unwind tables for exception handling") },
1092 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1093 N_("Support synchronous non-call exceptions") },
1094 {"profile-arcs", &profile_arc_flag
, 1,
1095 N_("Insert arc based program profiling code") },
1096 {"test-coverage", &flag_test_coverage
, 1,
1097 N_("Create data files needed by gcov") },
1098 {"branch-probabilities", &flag_branch_probabilities
, 1,
1099 N_("Use profiling information for branch probabilities") },
1100 {"reorder-blocks", &flag_reorder_blocks
, 1,
1101 N_("Reorder basic blocks to improve code placement") },
1102 {"rename-registers", &flag_rename_registers
, 1,
1103 N_("Do the register renaming optimization pass") },
1104 {"common", &flag_no_common
, 0,
1105 N_("Do not put unitialised globals in the common section") },
1106 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1107 N_("Do not generate .size directives") },
1108 {"function-sections", &flag_function_sections
, 1,
1109 N_("place each function into its own section") },
1110 {"data-sections", &flag_data_sections
, 1,
1111 N_("place data items into their own section") },
1112 {"verbose-asm", &flag_verbose_asm
, 1,
1113 N_("Add extra commentry to assembler output") },
1114 {"gnu-linker", &flag_gnu_linker
, 1,
1115 N_("Output GNU ld formatted global initialisers") },
1116 {"regmove", &flag_regmove
, 1,
1117 N_("Enables a register move optimisation") },
1118 {"optimize-register-move", &flag_regmove
, 1,
1119 N_("Do the full regmove optimization pass") },
1120 {"pack-struct", &flag_pack_struct
, 1,
1121 N_("Pack structure members together without holes") },
1122 {"stack-check", &flag_stack_check
, 1,
1123 N_("Insert stack checking code into the program") },
1124 {"argument-alias", &flag_argument_noalias
, 0,
1125 N_("Specify that arguments may alias each other & globals") },
1126 {"argument-noalias", &flag_argument_noalias
, 1,
1127 N_("Assume arguments may alias globals but not each other") },
1128 {"argument-noalias-global", &flag_argument_noalias
, 2,
1129 N_("Assume arguments do not alias each other or globals") },
1130 {"strict-aliasing", &flag_strict_aliasing
, 1,
1131 N_("Assume strict aliasing rules apply") },
1132 {"align-loops", &align_loops
, 0,
1133 N_("Align the start of loops") },
1134 {"align-jumps", &align_jumps
, 0,
1135 N_("Align labels which are only reached by jumping") },
1136 {"align-labels", &align_labels
, 0,
1137 N_("Align all labels") },
1138 {"align-functions", &align_functions
, 0,
1139 N_("Align the start of functions") },
1140 {"check-memory-usage", &flag_check_memory_usage
, 1,
1141 N_("Generate code to check every memory access") },
1142 {"prefix-function-name", &flag_prefix_function_name
, 1,
1143 N_("Add a prefix to all function names") },
1144 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1145 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1146 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1147 N_("Instrument function entry/exit with profiling calls") },
1148 {"ssa", &flag_ssa
, 1,
1149 N_("Enable SSA optimizations") },
1150 {"ssa-ccp", &flag_ssa_ccp
, 1,
1151 N_("Enable SSA conditonal constant propagation") },
1152 {"ssa-dce", &flag_ssa_dce
, 1,
1153 N_("Enable aggressive SSA dead code elimination") },
1154 {"leading-underscore", &flag_leading_underscore
, 1,
1155 N_("External symbols have a leading underscore") },
1156 {"ident", &flag_no_ident
, 0,
1157 N_("Process #ident directives") },
1158 { "peephole2", &flag_peephole2
, 1,
1159 N_("Enables an rtl peephole pass run before sched2") },
1160 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1161 N_("Enables guessing of branch probabilities") },
1162 {"math-errno", &flag_errno_math
, 1,
1163 N_("Set errno after built-in math functions") },
1164 {"trapping-math", &flag_trapping_math
, 1,
1165 N_("Floating-point operations can trap") },
1166 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1167 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1168 {"bounded-pointers", &flag_bounded_pointers
, 1,
1169 N_("Compile pointers as triples: value, base & end") },
1170 {"bounds-check", &flag_bounds_check
, 1,
1171 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1172 {"single-precision-constant", &flag_single_precision_constant
, 1,
1173 N_("Convert floating point constant to single precision constant") },
1174 {"time-report", &time_report
, 1,
1175 N_("Report time taken by each compiler pass at end of run") },
1176 {"mem-report", &mem_report
, 1,
1177 N_("Report on permanent memory allocation at end of run") },
1178 { "trapv", &flag_trapv
, 1,
1179 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1182 /* Table of language-specific options. */
1184 static struct lang_opt
1187 const char *description
;
1189 documented_lang_options
[] =
1191 /* In order not to overload the --help output, the convention
1192 used here is to only describe those options which are not
1193 enabled by default. */
1196 N_("Compile just for ISO C89") },
1197 { "-fallow-single-precision",
1198 N_("Do not promote floats to double if using -traditional") },
1200 N_("Determine language standard") },
1202 { "-fsigned-bitfields", "" },
1203 { "-funsigned-bitfields",
1204 N_("Make bitfields by unsigned by default") },
1205 { "-fno-signed-bitfields", "" },
1206 { "-fno-unsigned-bitfields","" },
1208 N_("Make 'char' be signed by default") },
1209 { "-funsigned-char",
1210 N_("Make 'char' be unsigned by default") },
1211 { "-fno-signed-char", "" },
1212 { "-fno-unsigned-char", "" },
1214 { "-ftraditional", "" },
1216 N_("Attempt to support traditional K&R style C") },
1217 { "-fnotraditional", "" },
1218 { "-fno-traditional", "" },
1222 N_("Do not recognise the 'asm' keyword") },
1223 { "-fbuiltin", "" },
1225 N_("Do not recognise any built in functions") },
1227 N_("Assume normal C execution environment") },
1228 { "-fno-hosted", "" },
1230 N_("Assume that standard libraries & main might not exist") },
1231 { "-fno-freestanding", "" },
1232 { "-fcond-mismatch",
1233 N_("Allow different types as args of ? operator") },
1234 { "-fno-cond-mismatch", "" },
1235 { "-fdollars-in-identifiers",
1236 N_("Allow the use of $ inside identifiers") },
1237 { "-fno-dollars-in-identifiers", "" },
1238 { "-fpreprocessed", "" },
1239 { "-fno-preprocessed", "" },
1241 N_("Use the same size for double as for float") },
1242 { "-fno-short-double", "" },
1244 N_("Use the smallest fitting integer to hold enums") },
1245 { "-fno-short-enums", "" },
1247 N_("Override the underlying type for wchar_t to `unsigned short'") },
1248 { "-fno-short-wchar", "" },
1251 N_("Enable most warning messages") },
1252 { "-Wbad-function-cast",
1253 N_("Warn about casting functions to incompatible types") },
1254 { "-Wno-bad-function-cast", "" },
1255 { "-Wno-missing-noreturn", "" },
1256 { "-Wmissing-format-attribute",
1257 N_("Warn about functions which might be candidates for format attributes") },
1258 { "-Wno-missing-format-attribute", "" },
1260 N_("Warn about casts which discard qualifiers") },
1261 { "-Wno-cast-qual", "" },
1262 { "-Wchar-subscripts",
1263 N_("Warn about subscripts whose type is 'char'") },
1264 { "-Wno-char-subscripts", "" },
1266 N_("Warn if nested comments are detected") },
1267 { "-Wno-comment", "" },
1269 N_("Warn if nested comments are detected") },
1270 { "-Wno-comments", "" },
1272 N_("Warn about possibly confusing type conversions") },
1273 { "-Wno-conversion", "" },
1275 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1276 { "-Wno-format", "" },
1277 { "-Wformat-y2k", "" },
1278 { "-Wno-format-y2k",
1279 N_("Don't warn about strftime formats yielding 2 digit years") },
1280 { "-Wformat-extra-args", "" },
1281 { "-Wno-format-extra-args",
1282 N_("Don't warn about too many arguments to format functions") },
1283 { "-Wformat-nonliteral",
1284 N_("Warn about non-string-literal format strings") },
1285 { "-Wno-format-nonliteral", "" },
1286 { "-Wformat-security",
1287 N_("Warn about possible security problems with format functions") },
1288 { "-Wno-format-security", "" },
1289 { "-Wimplicit-function-declaration",
1290 N_("Warn about implicit function declarations") },
1291 { "-Wno-implicit-function-declaration", "" },
1292 { "-Werror-implicit-function-declaration", "" },
1294 N_("Warn when a declaration does not specify a type") },
1295 { "-Wno-implicit-int", "" },
1296 { "-Wimplicit", "" },
1297 { "-Wno-implicit", "" },
1299 N_("Warn about the use of the #import directive") },
1300 { "-Wno-import", "" },
1301 { "-Wlong-long","" },
1303 N_("Do not warn about using 'long long' when -pedantic") },
1305 N_("Warn about suspicious declarations of main") },
1306 { "-Wno-main", "" },
1307 { "-Wmissing-braces",
1308 N_("Warn about possibly missing braces around initialisers") },
1309 { "-Wno-missing-braces", "" },
1310 { "-Wmissing-declarations",
1311 N_("Warn about global funcs without previous declarations") },
1312 { "-Wno-missing-declarations", "" },
1313 { "-Wmissing-prototypes",
1314 N_("Warn about global funcs without prototypes") },
1315 { "-Wno-missing-prototypes", "" },
1317 N_("Warn about use of multicharacter literals") },
1318 { "-Wno-multichar", "" },
1319 { "-Wnested-externs",
1320 N_("Warn about externs not at file scope level") },
1321 { "-Wno-nested-externs", "" },
1323 N_("Warn about possible missing parentheses") },
1324 { "-Wno-parentheses", "" },
1325 { "-Wsequence-point",
1326 N_("Warn about possible violations of sequence point rules") },
1327 { "-Wno-sequence-point", "" },
1328 { "-Wpointer-arith",
1329 N_("Warn about function pointer arithmetic") },
1330 { "-Wno-pointer-arith", "" },
1331 { "-Wredundant-decls",
1332 N_("Warn about multiple declarations of the same object") },
1333 { "-Wno-redundant-decls", "" },
1335 N_("Warn about signed/unsigned comparisons") },
1336 { "-Wno-sign-compare", "" },
1338 N_("Warn about testing equality of floating point numbers") },
1339 { "-Wno-float-equal", "" },
1340 { "-Wunknown-pragmas",
1341 N_("Warn about unrecognized pragmas") },
1342 { "-Wno-unknown-pragmas", "" },
1343 { "-Wstrict-prototypes",
1344 N_("Warn about non-prototyped function decls") },
1345 { "-Wno-strict-prototypes", "" },
1347 N_("Warn about constructs whose meaning change in ISO C") },
1348 { "-Wno-traditional", "" },
1350 N_("Warn when trigraphs are encountered") },
1351 { "-Wno-trigraphs", "" },
1353 { "-Wno-undef", "" },
1354 { "-Wwrite-strings",
1355 N_("Mark strings as 'const char *'") },
1356 { "-Wno-write-strings", "" },
1358 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1360 #include "options.h"
1364 /* Here is a table, controlled by the tm.h file, listing each -m switch
1365 and which bits in `target_switches' it should set or clear.
1366 If VALUE is positive, it is bits to set.
1367 If VALUE is negative, -VALUE is bits to clear.
1368 (The sign bit is not used so there is no confusion.) */
1374 const char *description
;
1376 target_switches
[] = TARGET_SWITCHES
;
1378 /* This table is similar, but allows the switch to have a value. */
1380 #ifdef TARGET_OPTIONS
1384 const char **variable
;
1385 const char *description
;
1387 target_options
[] = TARGET_OPTIONS
;
1390 /* Options controlling warnings. */
1392 /* Don't print warning messages. -w. */
1394 int inhibit_warnings
= 0;
1396 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1398 int warn_system_headers
= 0;
1400 /* Print various extra warnings. -W. */
1402 int extra_warnings
= 0;
1404 /* Treat warnings as errors. -Werror. */
1406 int warnings_are_errors
= 0;
1408 /* Nonzero to warn about unused variables, functions et.al. */
1410 int warn_unused_function
;
1411 int warn_unused_label
;
1412 int warn_unused_parameter
;
1413 int warn_unused_variable
;
1414 int warn_unused_value
;
1417 set_Wunused (setting
)
1420 warn_unused_function
= setting
;
1421 warn_unused_label
= setting
;
1422 /* Unused function parameter warnings are reported when either ``-W
1423 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1424 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1426 warn_unused_parameter
= 0;
1427 else if (!warn_unused_parameter
)
1428 warn_unused_parameter
= -1;
1429 warn_unused_variable
= setting
;
1430 warn_unused_value
= setting
;
1433 /* Nonzero to warn about code which is never reached. */
1435 int warn_notreached
;
1437 /* Nonzero to warn about variables used before they are initialized. */
1439 int warn_uninitialized
;
1441 /* Nonzero means warn about all declarations which shadow others. */
1445 /* Warn if a switch on an enum fails to have a case for every enum value. */
1449 /* Nonzero means warn about function definitions that default the return type
1450 or that use a null return and have a return-type other than void. */
1452 int warn_return_type
;
1454 /* Nonzero means warn about pointer casts that increase the required
1455 alignment of the target type (and might therefore lead to a crash
1456 due to a misaligned access). */
1458 int warn_cast_align
;
1460 /* Nonzero means warn about any objects definitions whose size is larger
1461 than N bytes. Also want about function definitions whose returned
1462 values are larger than N bytes. The value N is in `larger_than_size'. */
1464 int warn_larger_than
;
1465 HOST_WIDE_INT larger_than_size
;
1467 /* Nonzero means warn if inline function is too large. */
1471 /* Warn if a function returns an aggregate,
1472 since there are often incompatible calling conventions for doing this. */
1474 int warn_aggregate_return
;
1476 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1480 /* Warn when gcc pads a structure to an alignment boundary. */
1484 /* Warn when an optimization pass is disabled. */
1486 int warn_disabled_optimization
;
1488 /* Warn about functions which might be candidates for attribute noreturn. */
1490 int warn_missing_noreturn
;
1492 /* Likewise for -W. */
1494 lang_independent_options W_options
[] =
1496 {"unused-function", &warn_unused_function
, 1,
1497 N_("Warn when a function is unused") },
1498 {"unused-label", &warn_unused_label
, 1,
1499 N_("Warn when a label is unused") },
1500 {"unused-parameter", &warn_unused_parameter
, 1,
1501 N_("Warn when a function parameter is unused") },
1502 {"unused-variable", &warn_unused_variable
, 1,
1503 N_("Warn when a variable is unused") },
1504 {"unused-value", &warn_unused_value
, 1,
1505 N_("Warn when an expression value is unused") },
1506 {"system-headers", &warn_system_headers
, 1,
1507 N_("Do not suppress warnings from system headers") },
1508 {"error", &warnings_are_errors
, 1,
1509 N_("Treat all warnings as errors") },
1510 {"shadow", &warn_shadow
, 1,
1511 N_("Warn when one local variable shadows another") },
1512 {"switch", &warn_switch
, 1,
1513 N_("Warn about enumerated switches missing a specific case") },
1514 {"aggregate-return", &warn_aggregate_return
, 1,
1515 N_("Warn about returning structures, unions or arrays") },
1516 {"cast-align", &warn_cast_align
, 1,
1517 N_("Warn about pointer casts which increase alignment") },
1518 {"unreachable-code", &warn_notreached
, 1,
1519 N_("Warn about code that will never be executed") },
1520 {"uninitialized", &warn_uninitialized
, 1,
1521 N_("Warn about unitialized automatic variables") },
1522 {"inline", &warn_inline
, 1,
1523 N_("Warn when an inlined function cannot be inlined") },
1524 {"packed", &warn_packed
, 1,
1525 N_("Warn when the packed attribute has no effect on struct layout") },
1526 {"padded", &warn_padded
, 1,
1527 N_("Warn when padding is required to align struct members") },
1528 {"disabled-optimization", &warn_disabled_optimization
, 1,
1529 N_("Warn when an optimization pass is disabled") },
1530 {"missing-noreturn", &warn_missing_noreturn
, 1,
1531 N_("Warn about functions which might be candidates for attribute noreturn") }
1534 /* The following routines are useful in setting all the flags that
1535 -ffast-math and -fno-fast-math imply. */
1538 set_fast_math_flags ()
1540 flag_trapping_math
= 0;
1541 flag_unsafe_math_optimizations
= 1;
1542 flag_errno_math
= 0;
1546 set_no_fast_math_flags ()
1548 flag_trapping_math
= 1;
1549 flag_unsafe_math_optimizations
= 0;
1550 flag_errno_math
= 1;
1554 /* Output files for assembler code (real compiler output)
1555 and debugging dumps. */
1558 FILE *aux_info_file
;
1559 FILE *rtl_dump_file
= NULL
;
1561 /* Decode the string P as an integral parameter.
1562 If the string is indeed an integer return its numeric value else
1563 issue an Invalid Option error for the option PNAME and return DEFVAL.
1564 If PNAME is zero just return DEFVAL, do not call error. */
1567 read_integral_parameter (p
, pname
, defval
)
1572 const char *endp
= p
;
1576 if (*endp
>= '0' && *endp
<= '9')
1585 error ("Invalid option `%s'", pname
);
1593 /* This is the default decl_printable_name function. */
1596 decl_name (decl
, verbosity
)
1598 int verbosity ATTRIBUTE_UNUSED
;
1600 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1604 /* This calls abort and is used to avoid problems when abort if a macro.
1605 It is used when we need to pass the address of abort. */
1613 /* When `malloc.c' is compiled with `rcheck' defined,
1614 it calls this function to report clobberage. */
1618 const char *s ATTRIBUTE_UNUSED
;
1623 /* Return the logarithm of X, base 2, considering X unsigned,
1624 if X is a power of 2. Otherwise, returns -1.
1626 This should be used via the `exact_log2' macro. */
1630 register unsigned HOST_WIDE_INT x
;
1632 register int log
= 0;
1633 /* Test for 0 or a power of 2. */
1634 if (x
== 0 || x
!= (x
& -x
))
1636 while ((x
>>= 1) != 0)
1641 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1642 If X is 0, return -1.
1644 This should be used via the floor_log2 macro. */
1648 register unsigned HOST_WIDE_INT x
;
1650 register int log
= -1;
1657 static int float_handler_set
;
1659 jmp_buf float_handler
;
1661 /* Signals actually come here. */
1664 float_signal (signo
)
1665 /* If this is missing, some compilers complain. */
1666 int signo ATTRIBUTE_UNUSED
;
1668 if (float_handled
== 0)
1669 crash_signal (signo
);
1672 /* On System-V derived systems, we must reinstall the signal handler.
1673 This is harmless on BSD-derived systems. */
1674 signal (SIGFPE
, float_signal
);
1675 longjmp (float_handler
, 1);
1678 /* Specify where to longjmp to when a floating arithmetic error happens.
1679 If HANDLER is 0, it means don't handle the errors any more. */
1682 set_float_handler (handler
)
1685 float_handled
= (handler
!= 0);
1687 memcpy (float_handler
, handler
, sizeof (float_handler
));
1689 if (float_handled
&& ! float_handler_set
)
1691 signal (SIGFPE
, float_signal
);
1692 float_handler_set
= 1;
1696 /* This is a wrapper function for code which might elicit an
1697 arithmetic exception. That code should be passed in as a function
1698 pointer FN, and one argument DATA. DATA is usually a struct which
1699 contains the real input and output for function FN. This function
1700 returns 0 (failure) if longjmp was called (i.e. an exception
1701 occured.) It returns 1 (success) otherwise. */
1704 do_float_handler (fn
, data
)
1705 void (*fn
) PARAMS ((PTR
));
1712 /* We got here via longjmp () caused by an exception in function
1714 set_float_handler (NULL
);
1718 set_float_handler (buf
);
1720 set_float_handler (NULL
);
1724 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1725 into ICE messages, which is much more user friendly. */
1728 crash_signal (signo
)
1731 internal_error ("Internal error: %s", strsignal (signo
));
1734 /* Strip off a legitimate source ending from the input string NAME of
1735 length LEN. Rather than having to know the names used by all of
1736 our front ends, we strip off an ending of a period followed by
1737 up to five characters. (Java uses ".class".) */
1740 strip_off_ending (name
, len
)
1745 for (i
= 2; i
< 6 && len
> i
; i
++)
1747 if (name
[len
- i
] == '.')
1749 name
[len
- i
] = '\0';
1755 /* Output a quoted string. */
1758 output_quoted_string (asm_file
, string
)
1762 #ifdef OUTPUT_QUOTED_STRING
1763 OUTPUT_QUOTED_STRING (asm_file
, string
);
1767 putc ('\"', asm_file
);
1768 while ((c
= *string
++) != 0)
1770 if (c
== '\"' || c
== '\\')
1771 putc ('\\', asm_file
);
1774 putc ('\"', asm_file
);
1778 /* Output a file name in the form wanted by System V. */
1781 output_file_directive (asm_file
, input_name
)
1783 const char *input_name
;
1785 int len
= strlen (input_name
);
1786 const char *na
= input_name
+ len
;
1788 /* NA gets INPUT_NAME sans directory names. */
1789 while (na
> input_name
)
1791 if (IS_DIR_SEPARATOR (na
[-1]))
1796 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1797 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1799 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1800 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1802 fprintf (asm_file
, "\t.file\t");
1803 output_quoted_string (asm_file
, na
);
1804 fputc ('\n', asm_file
);
1809 /* Routine to open a dump file. Return true if the dump file is enabled. */
1812 open_dump_file (index
, decl
)
1813 enum dump_file_index index
;
1817 const char *open_arg
;
1820 if (! dump_file
[index
].enabled
)
1823 timevar_push (TV_DUMP
);
1824 if (rtl_dump_file
!= NULL
)
1825 fclose (rtl_dump_file
);
1827 sprintf (seq
, ".%02d.", index
);
1829 if (! dump_file
[index
].initialized
)
1831 /* If we've not initialized the files, do so now. */
1832 if (graph_dump_format
!= no_graph
1833 && dump_file
[index
].graph_dump_p
)
1835 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1836 clean_graph_dump_file (dump_base_name
, dump_name
);
1839 dump_file
[index
].initialized
= 1;
1845 dump_name
= concat (dump_base_name
, seq
,
1846 dump_file
[index
].extension
, NULL
);
1848 rtl_dump_file
= fopen (dump_name
, open_arg
);
1849 if (rtl_dump_file
== NULL
)
1850 fatal_io_error ("can't open %s", dump_name
);
1855 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1856 decl_printable_name (decl
, 2));
1858 timevar_pop (TV_DUMP
);
1862 /* Routine to close a dump file. */
1865 close_dump_file (index
, func
, insns
)
1866 enum dump_file_index index
;
1867 void (*func
) PARAMS ((FILE *, rtx
));
1870 if (! rtl_dump_file
)
1873 timevar_push (TV_DUMP
);
1875 && graph_dump_format
!= no_graph
1876 && dump_file
[index
].graph_dump_p
)
1881 sprintf (seq
, ".%02d.", index
);
1882 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1883 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1888 func (rtl_dump_file
, insns
);
1890 fflush (rtl_dump_file
);
1891 fclose (rtl_dump_file
);
1893 rtl_dump_file
= NULL
;
1894 timevar_pop (TV_DUMP
);
1897 /* Do any final processing required for the declarations in VEC, of
1898 which there are LEN. We write out inline functions and variables
1899 that have been deferred until this point, but which are required.
1900 Returns non-zero if anything was put out. */
1903 wrapup_global_declarations (vec
, len
)
1910 int output_something
= 0;
1912 for (i
= 0; i
< len
; i
++)
1916 /* We're not deferring this any longer. */
1917 DECL_DEFER_OUTPUT (decl
) = 0;
1919 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1920 && incomplete_decl_finalize_hook
!= 0)
1921 (*incomplete_decl_finalize_hook
) (decl
);
1924 /* Now emit any global variables or functions that we have been
1925 putting off. We need to loop in case one of the things emitted
1926 here references another one which comes earlier in the list. */
1930 for (i
= 0; i
< len
; i
++)
1934 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1937 /* Don't write out static consts, unless we still need them.
1939 We also keep static consts if not optimizing (for debugging),
1940 unless the user specified -fno-keep-static-consts.
1941 ??? They might be better written into the debug information.
1942 This is possible when using DWARF.
1944 A language processor that wants static constants to be always
1945 written out (even if it is not used) is responsible for
1946 calling rest_of_decl_compilation itself. E.g. the C front-end
1947 calls rest_of_decl_compilation from finish_decl.
1948 One motivation for this is that is conventional in some
1949 environments to write things like:
1950 static const char rcsid[] = "... version string ...";
1951 intending to force the string to be in the executable.
1953 A language processor that would prefer to have unneeded
1954 static constants "optimized away" would just defer writing
1955 them out until here. E.g. C++ does this, because static
1956 constants are often defined in header files.
1958 ??? A tempting alternative (for both C and C++) would be
1959 to force a constant to be written if and only if it is
1960 defined in a main file, as opposed to an include file. */
1962 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1963 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1964 && !DECL_COMDAT (decl
))
1966 && flag_keep_static_consts
1967 && !DECL_ARTIFICIAL (decl
))
1968 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1971 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1974 if (TREE_CODE (decl
) == FUNCTION_DECL
1975 && DECL_INITIAL (decl
) != 0
1976 && DECL_SAVED_INSNS (decl
) != 0
1977 && (flag_keep_inline_functions
1978 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1982 output_inline_function (decl
);
1987 output_something
= 1;
1991 return output_something
;
1994 /* Issue appropriate warnings for the global declarations in VEC (of
1995 which there are LEN). Output debugging information for them. */
1998 check_global_declarations (vec
, len
)
2005 for (i
= 0; i
< len
; i
++)
2009 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2010 && ! TREE_ASM_WRITTEN (decl
))
2011 /* Cancel the RTL for this decl so that, if debugging info
2012 output for global variables is still to come,
2013 this one will be omitted. */
2014 SET_DECL_RTL (decl
, NULL_RTX
);
2016 /* Warn about any function
2017 declared static but not defined.
2018 We don't warn about variables,
2019 because many programs have static variables
2020 that exist only to get some text into the object file. */
2021 if (TREE_CODE (decl
) == FUNCTION_DECL
2022 && (warn_unused_function
2023 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2024 && DECL_INITIAL (decl
) == 0
2025 && DECL_EXTERNAL (decl
)
2026 && ! DECL_ARTIFICIAL (decl
)
2027 && ! TREE_PUBLIC (decl
))
2029 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2030 pedwarn_with_decl (decl
,
2031 "`%s' used but never defined");
2033 warning_with_decl (decl
,
2034 "`%s' declared `static' but never defined");
2035 /* This symbol is effectively an "extern" declaration now. */
2036 TREE_PUBLIC (decl
) = 1;
2037 assemble_external (decl
);
2040 /* Warn about static fns or vars defined but not used,
2041 but not about inline functions or static consts
2042 since defining those in header files is normal practice. */
2043 if (((warn_unused_function
2044 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2045 || (warn_unused_variable
2046 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2047 && ! DECL_IN_SYSTEM_HEADER (decl
)
2048 && ! DECL_EXTERNAL (decl
)
2049 && ! TREE_PUBLIC (decl
)
2050 && ! TREE_USED (decl
)
2051 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2052 /* The TREE_USED bit for file-scope decls
2053 is kept in the identifier, to handle multiple
2054 external decls in different scopes. */
2055 && ! TREE_USED (DECL_NAME (decl
)))
2056 warning_with_decl (decl
, "`%s' defined but not used");
2058 timevar_push (TV_SYMOUT
);
2059 (*debug_hooks
->global_decl
) (decl
);
2060 timevar_pop (TV_SYMOUT
);
2064 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2065 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2066 INPUT_FILENAME and LINENO accordingly. */
2069 push_srcloc (file
, line
)
2073 struct file_stack
*fs
;
2075 if (input_file_stack
)
2077 input_file_stack
->name
= input_filename
;
2078 input_file_stack
->line
= lineno
;
2081 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2082 fs
->name
= input_filename
= file
;
2083 fs
->line
= lineno
= line
;
2084 fs
->indent_level
= 0;
2085 fs
->next
= input_file_stack
;
2086 input_file_stack
= fs
;
2087 input_file_stack_tick
++;
2090 /* Pop the top entry off the stack of presently open source files.
2091 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2097 struct file_stack
*fs
;
2099 fs
= input_file_stack
;
2100 input_file_stack
= fs
->next
;
2102 input_file_stack_tick
++;
2103 /* The initial source file is never popped. */
2104 if (!input_file_stack
)
2106 input_filename
= input_file_stack
->name
;
2107 lineno
= input_file_stack
->line
;
2110 /* Compile an entire file of output from cpp, named NAME.
2111 Write a file of assembly output and various debugging dumps. */
2119 int name_specified
= name
!= 0;
2121 if (dump_base_name
== 0)
2122 dump_base_name
= name
? name
: "gccdump";
2127 /* Start timing total execution time. */
2130 timevar_start (TV_TOTAL
);
2132 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2133 because then the driver will have provided the name of a temporary
2134 file or bit bucket for us. */
2136 if (! name_specified
&& asm_file_name
== 0)
2137 asm_out_file
= stdout
;
2140 if (asm_file_name
== 0)
2142 int len
= strlen (dump_base_name
);
2143 char *dumpname
= (char *) xmalloc (len
+ 6);
2144 memcpy (dumpname
, dump_base_name
, len
+ 1);
2145 strip_off_ending (dumpname
, len
);
2146 strcat (dumpname
, ".s");
2147 asm_file_name
= dumpname
;
2149 if (!strcmp (asm_file_name
, "-"))
2150 asm_out_file
= stdout
;
2152 asm_out_file
= fopen (asm_file_name
, "w");
2153 if (asm_out_file
== 0)
2154 fatal_io_error ("can't open %s for writing", asm_file_name
);
2157 /* Initialize data in various passes. */
2160 name
= init_parse (name
);
2161 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2162 || debug_info_level
== DINFO_LEVEL_VERBOSE
2163 || flag_test_coverage
2164 || warn_notreached
);
2167 init_decl_processing ();
2173 init_function_once ();
2174 init_stor_layout_once ();
2175 init_varasm_once ();
2176 init_EXPR_INSN_LIST_cache ();
2178 /* The following initialization functions need to generate rtl, so
2179 provide a dummy function context for them. */
2180 init_dummy_function_start ();
2183 if (flag_caller_saves
)
2184 init_caller_save ();
2185 expand_dummy_function_end ();
2187 /* If auxiliary info generation is desired, open the output file.
2188 This goes in the same directory as the source file--unlike
2189 all the other output files. */
2190 if (flag_gen_aux_info
)
2192 aux_info_file
= fopen (aux_info_file_name
, "w");
2193 if (aux_info_file
== 0)
2194 fatal_io_error ("can't open %s", aux_info_file_name
);
2197 #ifdef IO_BUFFER_SIZE
2198 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2199 _IOFBF
, IO_BUFFER_SIZE
);
2203 name
= ggc_strdup (name
);
2205 input_filename
= name
;
2207 /* Put an entry on the input file stack for the main input file. */
2208 push_srcloc (input_filename
, 0);
2210 /* Perform language-specific initialization.
2211 This may set main_input_filename. */
2212 if (lang_hooks
.init
)
2213 (*lang_hooks
.init
) ();
2215 /* If the input doesn't start with a #line, use the input name
2216 as the official input file name. */
2217 if (main_input_filename
== 0)
2218 main_input_filename
= name
;
2220 if (flag_syntax_only
)
2222 write_symbols
= NO_DEBUG
;
2224 profile_block_flag
= 0;
2228 #ifdef ASM_FILE_START
2229 ASM_FILE_START (asm_out_file
);
2232 #ifdef ASM_COMMENT_START
2233 if (flag_verbose_asm
)
2235 /* Print the list of options in effect. */
2236 print_version (asm_out_file
, ASM_COMMENT_START
);
2237 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2238 ASM_COMMENT_START
, " ", "\n");
2239 /* Add a blank line here so it appears in assembler output but not
2241 fprintf (asm_out_file
, "\n");
2244 } /* ! flag_syntax_only */
2246 /* Set up the debug hooks based on write_symbols. Default to doing
2248 debug_hooks
= &do_nothing_debug_hooks
;
2249 #if defined(DBX_DEBUGGING_INFO)
2250 if (write_symbols
== DBX_DEBUG
)
2251 debug_hooks
= &dbx_debug_hooks
;
2253 #if defined(XCOFF_DEBUGGING_INFO)
2254 if (write_symbols
== XCOFF_DEBUG
)
2255 debug_hooks
= &xcoff_debug_hooks
;
2257 #ifdef SDB_DEBUGGING_INFO
2258 if (write_symbols
== SDB_DEBUG
)
2259 debug_hooks
= &sdb_debug_hooks
;
2261 #ifdef DWARF_DEBUGGING_INFO
2262 if (write_symbols
== DWARF_DEBUG
)
2263 debug_hooks
= &dwarf_debug_hooks
;
2265 #ifdef DWARF2_DEBUGGING_INFO
2266 if (write_symbols
== DWARF2_DEBUG
)
2267 debug_hooks
= &dwarf2_debug_hooks
;
2270 #ifndef ASM_OUTPUT_SECTION_NAME
2271 if (flag_function_sections
)
2273 warning ("-ffunction-sections not supported for this target.");
2274 flag_function_sections
= 0;
2276 if (flag_data_sections
)
2278 warning ("-fdata-sections not supported for this target.");
2279 flag_data_sections
= 0;
2283 if (flag_function_sections
2284 && (profile_flag
|| profile_block_flag
))
2286 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2287 flag_function_sections
= 0;
2290 #ifndef OBJECT_FORMAT_ELF
2291 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2292 warning ("-ffunction-sections may affect debugging on some targets.");
2295 /* If dbx symbol table desired, initialize writing it
2296 and output the predefined types. */
2297 timevar_push (TV_SYMOUT
);
2298 #ifdef DWARF2_UNWIND_INFO
2299 if (dwarf2out_do_frame ())
2300 dwarf2out_frame_init ();
2303 (*debug_hooks
->init
) (main_input_filename
);
2304 timevar_pop (TV_SYMOUT
);
2306 /* Initialize yet another pass. */
2308 init_final (main_input_filename
);
2309 init_branch_prob (dump_base_name
);
2311 timevar_push (TV_PARSE
);
2313 /* Call the parser, which parses the entire file
2314 (calling rest_of_compilation for each function). */
2316 if (yyparse () != 0)
2318 if (errorcount
== 0)
2319 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2321 /* In case there were missing closebraces,
2322 get us back to the global binding level. */
2323 while (! global_bindings_p ())
2327 /* Compilation is now finished except for writing
2328 what's left of the symbol table output. */
2330 timevar_pop (TV_PARSE
);
2332 if (flag_syntax_only
)
2335 globals
= getdecls ();
2337 /* Really define vars that have had only a tentative definition.
2338 Really output inline functions that must actually be callable
2339 and have not been output so far. */
2342 int len
= list_length (globals
);
2343 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2347 /* Process the decls in reverse order--earliest first.
2348 Put them into VEC from back to front, then take out from front. */
2350 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2351 vec
[len
- i
- 1] = decl
;
2353 wrapup_global_declarations (vec
, len
);
2355 /* This must occur after the loop to output deferred functions. Else
2356 the profiler initializer would not be emitted if all the functions
2357 in this compilation unit were deferred.
2359 output_func_start_profiler can not cause any additional functions or
2360 data to need to be output, so it need not be in the deferred function
2362 output_func_start_profiler ();
2364 check_global_declarations (vec
, len
);
2370 /* Write out any pending weak symbol declarations. */
2374 /* Do dbx symbols. */
2375 timevar_push (TV_SYMOUT
);
2377 #ifdef DWARF2_UNWIND_INFO
2378 if (dwarf2out_do_frame ())
2379 dwarf2out_frame_finish ();
2382 (*debug_hooks
->finish
) (main_input_filename
);
2383 timevar_pop (TV_SYMOUT
);
2385 /* Output some stuff at end of file if nec. */
2387 dw2_output_indirect_constants ();
2389 end_final (dump_base_name
);
2391 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2393 timevar_push (TV_DUMP
);
2394 open_dump_file (DFI_bp
, NULL
);
2398 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2399 timevar_pop (TV_DUMP
);
2403 ASM_FILE_END (asm_out_file
);
2406 /* Attach a special .ident directive to the end of the file to identify
2407 the version of GCC which compiled this code. The format of the .ident
2408 string is patterned after the ones produced by native SVR4 compilers. */
2411 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2412 IDENT_ASM_OP
, version_string
);
2415 /* Language-specific end of compilation actions. */
2417 if (lang_hooks
.finish
)
2418 (*lang_hooks
.finish
) ();
2420 /* Close the dump files. */
2422 if (flag_gen_aux_info
)
2424 fclose (aux_info_file
);
2426 unlink (aux_info_file_name
);
2429 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2431 timevar_push (TV_DUMP
);
2432 dump_combine_total_stats (rtl_dump_file
);
2433 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2434 timevar_pop (TV_DUMP
);
2437 /* Close non-debugging input and output files. Take special care to note
2438 whether fclose returns an error, since the pages might still be on the
2439 buffer chain while the file is open. */
2443 if (ferror (asm_out_file
) != 0)
2444 fatal_io_error ("error writing to %s", asm_file_name
);
2445 if (fclose (asm_out_file
) != 0)
2446 fatal_io_error ("error closing %s", asm_file_name
);
2448 /* Do whatever is necessary to finish printing the graphs. */
2449 if (graph_dump_format
!= no_graph
)
2453 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2454 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2459 sprintf (seq
, ".%02d.", i
);
2460 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2461 finish_graph_dump_file (dump_base_name
, suffix
);
2468 ggc_print_statistics ();
2469 stringpool_statistics ();
2472 /* Free up memory for the benefit of leak detectors. */
2475 /* Stop timing total execution time. */
2476 timevar_stop (TV_TOTAL
);
2478 /* Print the times. */
2480 timevar_print (stderr
);
2483 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2484 and TYPE_DECL nodes.
2486 This does nothing for local (non-static) variables, unless the
2487 variable is a register variable with an ASMSPEC. In that case, or
2488 if the variable is not an automatic, it sets up the RTL and
2489 outputs any assembler code (label definition, storage allocation
2490 and initialization).
2492 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2493 the assembler symbol name to be used. TOP_LEVEL is nonzero
2494 if this declaration is not within a function. */
2497 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2499 const char *asmspec
;
2503 /* Declarations of variables, and of functions defined elsewhere. */
2505 /* The most obvious approach, to put an #ifndef around where
2506 this macro is used, doesn't work since it's inside a macro call. */
2507 #ifndef ASM_FINISH_DECLARE_OBJECT
2508 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2511 /* Forward declarations for nested functions are not "external",
2512 but we need to treat them as if they were. */
2513 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2514 || TREE_CODE (decl
) == FUNCTION_DECL
)
2516 timevar_push (TV_VARCONST
);
2518 make_decl_rtl (decl
, asmspec
);
2519 /* Don't output anything
2520 when a tentative file-scope definition is seen.
2521 But at end of compilation, do output code for them. */
2522 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2523 assemble_variable (decl
, top_level
, at_end
, 0);
2524 if (decl
== last_assemble_variable_decl
)
2526 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2529 timevar_pop (TV_VARCONST
);
2531 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2533 if (decode_reg_name (asmspec
) >= 0)
2535 SET_DECL_RTL (decl
, NULL_RTX
);
2536 make_decl_rtl (decl
, asmspec
);
2540 error ("invalid register name `%s' for register variable", asmspec
);
2541 DECL_REGISTER (decl
) = 0;
2546 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2547 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2548 && TREE_CODE (decl
) == TYPE_DECL
)
2550 timevar_push (TV_SYMOUT
);
2551 dbxout_symbol (decl
, 0);
2552 timevar_pop (TV_SYMOUT
);
2555 #ifdef SDB_DEBUGGING_INFO
2556 else if (write_symbols
== SDB_DEBUG
&& top_level
2557 && TREE_CODE (decl
) == TYPE_DECL
)
2559 timevar_push (TV_SYMOUT
);
2560 sdbout_symbol (decl
, 0);
2561 timevar_pop (TV_SYMOUT
);
2566 /* Called after finishing a record, union or enumeral type. */
2569 rest_of_type_compilation (type
, toplev
)
2570 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2574 tree type ATTRIBUTE_UNUSED
;
2575 int toplev ATTRIBUTE_UNUSED
;
2578 timevar_push (TV_SYMOUT
);
2579 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2580 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2581 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2583 #ifdef SDB_DEBUGGING_INFO
2584 if (write_symbols
== SDB_DEBUG
)
2585 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2587 #ifdef DWARF2_DEBUGGING_INFO
2588 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2589 dwarf2out_decl (TYPE_STUB_DECL (type
));
2591 timevar_pop (TV_SYMOUT
);
2594 /* This is called from finish_function (within yyparse)
2595 after each top-level definition is parsed.
2596 It is supposed to compile that function or variable
2597 and output the assembler code for it.
2598 After we return, the tree storage is freed. */
2601 rest_of_compilation (decl
)
2607 int rebuild_label_notes_after_reload
;
2608 int register_life_up_to_date
;
2610 timevar_push (TV_REST_OF_COMPILATION
);
2612 /* Now that we're out of the frontend, we shouldn't have any more
2613 CONCATs anywhere. */
2614 generating_concat_p
= 0;
2616 /* When processing delayed functions, prepare_function_start() won't
2617 have been run to re-initialize it. */
2618 cse_not_expected
= ! optimize
;
2620 /* First, make sure that NOTE_BLOCK is set correctly for each
2621 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2622 if (!cfun
->x_whole_function_mode_p
)
2625 /* Then remove any notes we don't need. That will make iterating
2626 over the instruction sequence faster, and allow the garbage
2627 collector to reclaim the memory used by the notes. */
2628 remove_unnecessary_notes ();
2630 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2631 tree in sensible shape. So, we just recalculate it here. */
2632 if (cfun
->x_whole_function_mode_p
)
2637 /* If we are reconsidering an inline function
2638 at the end of compilation, skip the stuff for making it inline. */
2640 if (DECL_SAVED_INSNS (decl
) == 0)
2646 /* If this is nested inside an inlined external function, pretend
2647 it was only declared. Since we cannot inline such functions,
2648 generating code for this one is not only not necessary but will
2649 confuse some debugging output writers. */
2650 for (parent
= DECL_CONTEXT (current_function_decl
);
2651 parent
!= NULL_TREE
;
2652 parent
= get_containing_scope (parent
))
2653 if (TREE_CODE (parent
) == FUNCTION_DECL
2654 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2656 DECL_INITIAL (decl
) = 0;
2657 goto exit_rest_of_compilation
;
2660 /* If requested, consider whether to make this function inline. */
2661 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2662 || flag_inline_functions
)
2664 timevar_push (TV_INTEGRATION
);
2665 lose
= function_cannot_inline_p (decl
);
2666 timevar_pop (TV_INTEGRATION
);
2667 if (lose
|| ! optimize
)
2669 if (warn_inline
&& DECL_INLINE (decl
))
2670 warning_with_decl (decl
, lose
);
2671 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2672 /* Don't really compile an extern inline function.
2673 If we can't make it inline, pretend
2674 it was only declared. */
2675 if (DECL_EXTERNAL (decl
))
2677 DECL_INITIAL (decl
) = 0;
2678 goto exit_rest_of_compilation
;
2682 /* ??? Note that this has the effect of making it look
2683 like "inline" was specified for a function if we choose
2684 to inline it. This isn't quite right, but it's
2685 probably not worth the trouble to fix. */
2686 inlinable
= DECL_INLINE (decl
) = 1;
2689 insns
= get_insns ();
2691 /* Dump the rtl code if we are dumping rtl. */
2693 if (open_dump_file (DFI_rtl
, decl
))
2695 if (DECL_SAVED_INSNS (decl
))
2696 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2697 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2700 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2701 sorts of eh initialization. Delay this until after the
2702 initial rtl dump so that we can see the original nesting. */
2703 convert_from_eh_region_ranges ();
2705 /* If function is inline, and we don't yet know whether to
2706 compile it by itself, defer decision till end of compilation.
2707 finish_compilation will call rest_of_compilation again
2708 for those functions that need to be output. Also defer those
2709 functions that we are supposed to defer. */
2712 || (DECL_INLINE (decl
)
2713 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2714 && ! flag_keep_inline_functions
)
2715 || DECL_EXTERNAL (decl
))))
2716 DECL_DEFER_OUTPUT (decl
) = 1;
2718 if (DECL_INLINE (decl
))
2719 /* DWARF wants seperate debugging info for abstract and
2720 concrete instances of all inline functions, including those
2721 declared inline but not inlined, and those inlined even
2722 though they weren't declared inline. Conveniently, that's
2723 what DECL_INLINE means at this point. */
2724 (*debug_hooks
->deferred_inline_function
) (decl
);
2726 if (DECL_DEFER_OUTPUT (decl
))
2728 /* If -Wreturn-type, we have to do a bit of compilation. We just
2729 want to call cleanup the cfg to figure out whether or not we can
2730 fall off the end of the function; we do the minimum amount of
2731 work necessary to make that safe. */
2732 if (warn_return_type
)
2734 int saved_optimize
= optimize
;
2737 rebuild_jump_labels (insns
);
2738 find_exception_handler_labels ();
2739 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2740 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2741 optimize
= saved_optimize
;
2744 current_function_nothrow
= nothrow_function_p ();
2745 if (current_function_nothrow
)
2746 /* Now we know that this can't throw; set the flag for the benefit
2747 of other functions later in this translation unit. */
2748 TREE_NOTHROW (current_function_decl
) = 1;
2750 timevar_push (TV_INTEGRATION
);
2751 save_for_inline (decl
);
2752 timevar_pop (TV_INTEGRATION
);
2753 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2754 goto exit_rest_of_compilation
;
2757 /* If specified extern inline but we aren't inlining it, we are
2758 done. This goes for anything that gets here with DECL_EXTERNAL
2759 set, not just things with DECL_INLINE. */
2760 if (DECL_EXTERNAL (decl
))
2761 goto exit_rest_of_compilation
;
2766 /* Initialize some variables used by the optimizers. */
2767 init_function_for_compilation ();
2769 if (! DECL_DEFER_OUTPUT (decl
))
2770 TREE_ASM_WRITTEN (decl
) = 1;
2772 /* Now that integrate will no longer see our rtl, we need not
2773 distinguish between the return value of this function and the
2774 return value of called functions. Also, we can remove all SETs
2775 of subregs of hard registers; they are only here because of
2776 integrate. Also, we can now initialize pseudos intended to
2777 carry magic hard reg data throughout the function. */
2778 rtx_equal_function_value_matters
= 0;
2779 purge_hard_subreg_sets (get_insns ());
2780 emit_initial_value_sets ();
2782 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2783 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2784 goto exit_rest_of_compilation
;
2786 /* We may have potential sibling or tail recursion sites. Select one
2787 (of possibly multiple) methods of performing the call. */
2788 if (flag_optimize_sibling_calls
)
2790 timevar_push (TV_JUMP
);
2791 open_dump_file (DFI_sibling
, decl
);
2793 optimize_sibling_and_tail_recursive_calls ();
2795 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2796 timevar_pop (TV_JUMP
);
2799 /* Complete generation of exception handling code. */
2800 find_exception_handler_labels ();
2803 timevar_push (TV_JUMP
);
2804 open_dump_file (DFI_eh
, decl
);
2806 finish_eh_generation ();
2808 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2809 timevar_pop (TV_JUMP
);
2813 /* If we are doing position-independent code generation, now
2814 is the time to output special prologues and epilogues.
2815 We do not want to do this earlier, because it just clutters
2816 up inline functions with meaningless insns. */
2821 insns
= get_insns ();
2823 /* Copy any shared structure that should not be shared. */
2824 unshare_all_rtl (current_function_decl
, insns
);
2826 #ifdef SETJMP_VIA_SAVE_AREA
2827 /* This must be performed before virutal register instantiation. */
2828 if (current_function_calls_alloca
)
2829 optimize_save_area_alloca (insns
);
2832 /* Instantiate all virtual registers. */
2833 instantiate_virtual_regs (current_function_decl
, insns
);
2835 open_dump_file (DFI_jump
, decl
);
2837 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2838 are initialized and to compute whether control can drop off the end
2841 timevar_push (TV_JUMP
);
2842 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2843 before jump optimization switches branch directions. */
2844 expected_value_to_br_prob ();
2846 reg_scan (insns
, max_reg_num (), 0);
2847 rebuild_jump_labels (insns
);
2848 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2849 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
);
2850 copy_loop_headers (insns
);
2851 purge_line_number_notes (insns
);
2853 timevar_pop (TV_JUMP
);
2855 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2856 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2858 close_dump_file (DFI_jump
, print_rtl
, insns
);
2859 goto exit_rest_of_compilation
;
2862 /* Long term, this should probably move before the jump optimizer too,
2863 but I didn't want to disturb the rtl_dump_and_exit and related
2864 stuff at this time. */
2865 if (optimize
> 0 && flag_ssa
)
2867 /* Convert to SSA form. */
2869 timevar_push (TV_TO_SSA
);
2870 open_dump_file (DFI_ssa
, decl
);
2872 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2873 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2876 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2877 timevar_pop (TV_TO_SSA
);
2879 /* Perform sparse conditional constant propagation, if requested. */
2882 timevar_push (TV_SSA_CCP
);
2883 open_dump_file (DFI_ssa_ccp
, decl
);
2887 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2888 timevar_pop (TV_SSA_CCP
);
2891 /* It would be useful to cleanup the CFG at this point, but block
2892 merging and possibly other transformations might leave a PHI
2893 node in the middle of a basic block, which is a strict no-no. */
2895 /* The SSA implementation uses basic block numbers in its phi
2896 nodes. Thus, changing the control-flow graph or the basic
2897 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2898 may cause problems. */
2902 /* Remove dead code. */
2904 timevar_push (TV_SSA_DCE
);
2905 open_dump_file (DFI_ssa_dce
, decl
);
2907 insns
= get_insns ();
2908 ssa_eliminate_dead_code();
2910 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2911 timevar_pop (TV_SSA_DCE
);
2914 /* Convert from SSA form. */
2916 timevar_push (TV_FROM_SSA
);
2917 open_dump_file (DFI_ussa
, decl
);
2919 convert_from_ssa ();
2920 /* New registers have been created. Rescan their usage. */
2921 reg_scan (insns
, max_reg_num (), 1);
2922 /* Life analysis used in SSA adds log_links but these
2923 shouldn't be there until the flow stage, so clear
2925 clear_log_links (insns
);
2927 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2928 timevar_pop (TV_FROM_SSA
);
2933 timevar_push (TV_JUMP
);
2937 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2938 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2940 /* ??? Run if-conversion before delete_null_pointer_checks,
2941 since the later does not preserve the CFG. This should
2942 be changed -- no since converting if's that are going to
2944 timevar_push (TV_IFCVT
);
2946 timevar_pop (TV_IFCVT
);
2948 /* Try to identify useless null pointer tests and delete them. */
2949 if (flag_delete_null_pointer_checks
)
2950 delete_null_pointer_checks (insns
);
2953 /* Jump optimization, and the removal of NULL pointer checks, may
2954 have reduced the number of instructions substantially. CSE, and
2955 future passes, allocate arrays whose dimensions involve the
2956 maximum instruction UID, so if we can reduce the maximum UID
2957 we'll save big on memory. */
2958 renumber_insns (rtl_dump_file
);
2959 timevar_pop (TV_JUMP
);
2961 close_dump_file (DFI_jump
, print_rtl
, insns
);
2965 /* Perform common subexpression elimination.
2966 Nonzero value from `cse_main' means that jumps were simplified
2967 and some code may now be unreachable, so do
2968 jump optimization again. */
2972 open_dump_file (DFI_cse
, decl
);
2973 timevar_push (TV_CSE
);
2975 reg_scan (insns
, max_reg_num (), 1);
2977 if (flag_thread_jumps
)
2979 timevar_push (TV_JUMP
);
2980 thread_jumps (insns
, max_reg_num (), 1);
2981 timevar_pop (TV_JUMP
);
2984 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2986 /* If we are not running more CSE passes, then we are no longer
2987 expecting CSE to be run. But always rerun it in a cheap mode. */
2988 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2990 if (tem
|| optimize
> 1)
2992 timevar_push (TV_JUMP
);
2993 rebuild_jump_labels (insns
);
2994 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2995 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2996 timevar_pop (TV_JUMP
);
2999 /* Run this after jump optmizations remove all the unreachable code
3000 so that unreachable code will not keep values live. */
3001 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3003 /* Try to identify useless null pointer tests and delete them. */
3004 if (flag_delete_null_pointer_checks
)
3006 timevar_push (TV_JUMP
);
3007 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3009 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3011 delete_null_pointer_checks (insns
);
3012 timevar_pop (TV_JUMP
);
3015 /* The second pass of jump optimization is likely to have
3016 removed a bunch more instructions. */
3017 renumber_insns (rtl_dump_file
);
3019 timevar_pop (TV_CSE
);
3020 close_dump_file (DFI_cse
, print_rtl
, insns
);
3023 open_dump_file (DFI_addressof
, decl
);
3025 purge_addressof (insns
);
3026 reg_scan (insns
, max_reg_num (), 1);
3028 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3032 /* Perform global cse. */
3034 if (optimize
> 0 && flag_gcse
)
3036 int save_csb
, save_cfj
;
3039 timevar_push (TV_GCSE
);
3040 open_dump_file (DFI_gcse
, decl
);
3042 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3043 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3044 tem
= gcse_main (insns
, rtl_dump_file
);
3046 save_csb
= flag_cse_skip_blocks
;
3047 save_cfj
= flag_cse_follow_jumps
;
3048 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3050 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3052 if (flag_expensive_optimizations
)
3054 timevar_push (TV_CSE
);
3055 reg_scan (insns
, max_reg_num (), 1);
3056 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3057 timevar_pop (TV_CSE
);
3058 cse_not_expected
= !flag_rerun_cse_after_loop
;
3061 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3062 things up. Then possibly re-run CSE again. */
3066 timevar_push (TV_JUMP
);
3067 rebuild_jump_labels (insns
);
3068 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3069 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3070 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3071 timevar_pop (TV_JUMP
);
3073 if (flag_expensive_optimizations
)
3075 timevar_push (TV_CSE
);
3076 reg_scan (insns
, max_reg_num (), 1);
3077 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3078 timevar_pop (TV_CSE
);
3082 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3083 timevar_pop (TV_GCSE
);
3086 flag_cse_skip_blocks
= save_csb
;
3087 flag_cse_follow_jumps
= save_cfj
;
3090 /* Move constant computations out of loops. */
3094 timevar_push (TV_LOOP
);
3095 open_dump_file (DFI_loop
, decl
);
3097 if (flag_rerun_loop_opt
)
3099 cleanup_barriers ();
3101 /* We only want to perform unrolling once. */
3103 loop_optimize (insns
, rtl_dump_file
, 0);
3105 /* The first call to loop_optimize makes some instructions
3106 trivially dead. We delete those instructions now in the
3107 hope that doing so will make the heuristics in loop work
3108 better and possibly speed up compilation. */
3109 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3111 /* The regscan pass is currently necessary as the alias
3112 analysis code depends on this information. */
3113 reg_scan (insns
, max_reg_num (), 1);
3115 cleanup_barriers ();
3116 loop_optimize (insns
, rtl_dump_file
,
3117 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3119 close_dump_file (DFI_loop
, print_rtl
, insns
);
3120 timevar_pop (TV_LOOP
);
3127 timevar_push (TV_CSE2
);
3128 open_dump_file (DFI_cse2
, decl
);
3130 if (flag_rerun_cse_after_loop
)
3132 /* Running another jump optimization pass before the second
3133 cse pass sometimes simplifies the RTL enough to allow
3134 the second CSE pass to do a better job. Jump_optimize can change
3135 max_reg_num so we must rerun reg_scan afterwards.
3136 ??? Rework to not call reg_scan so often. */
3137 timevar_push (TV_JUMP
);
3139 /* The previous call to loop_optimize makes some instructions
3140 trivially dead. We delete those instructions now in the
3141 hope that doing so will make the heuristics in jump work
3142 better and possibly speed up compilation. */
3143 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3145 reg_scan (insns
, max_reg_num (), 0);
3147 timevar_push (TV_IFCVT
);
3149 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3150 cleanup_cfg (CLEANUP_EXPENSIVE
);
3153 timevar_pop(TV_IFCVT
);
3155 timevar_pop (TV_JUMP
);
3157 reg_scan (insns
, max_reg_num (), 0);
3158 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3162 timevar_push (TV_JUMP
);
3163 rebuild_jump_labels (insns
);
3164 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3165 cleanup_cfg (CLEANUP_EXPENSIVE
);
3166 timevar_pop (TV_JUMP
);
3170 if (flag_thread_jumps
)
3172 /* This pass of jump threading straightens out code
3173 that was kinked by loop optimization. */
3174 timevar_push (TV_JUMP
);
3175 reg_scan (insns
, max_reg_num (), 0);
3176 thread_jumps (insns
, max_reg_num (), 0);
3177 timevar_pop (TV_JUMP
);
3180 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3181 timevar_pop (TV_CSE2
);
3186 cse_not_expected
= 1;
3190 /* Do control and data flow analysis; wrote some of the results to
3193 timevar_push (TV_FLOW
);
3194 open_dump_file (DFI_cfg
, decl
);
3196 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3197 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3198 check_function_return_warnings ();
3200 /* It may make more sense to mark constant functions after dead code is
3201 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3202 may insert code making function non-constant, but we still must consider
3203 it as constant, otherwise -fbranch-probabilities will not read data back.
3205 life_analyzis rarely eliminates modification of external memory.
3207 mark_constant_function ();
3209 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3211 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3213 timevar_push (TV_BRANCH_PROB
);
3214 open_dump_file (DFI_bp
, decl
);
3218 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3219 timevar_pop (TV_BRANCH_PROB
);
3222 open_dump_file (DFI_life
, decl
);
3227 /* Discover and record the loop depth at the head of each basic
3228 block. The loop infrastructure does the real job for us. */
3229 flow_loops_find (&loops
, LOOP_TREE
);
3231 /* Estimate using heuristics if no profiling info is available. */
3232 if (flag_guess_branch_prob
)
3233 estimate_probability (&loops
);
3236 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3238 flow_loops_free (&loops
);
3240 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3241 timevar_pop (TV_FLOW
);
3245 if (warn_uninitialized
|| extra_warnings
)
3247 uninitialized_vars_warning (DECL_INITIAL (decl
));
3249 setjmp_args_warning ();
3252 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3256 /* If -opt, try combining insns through substitution. */
3260 int rebuild_jump_labels_after_combine
= 0;
3262 timevar_push (TV_COMBINE
);
3263 open_dump_file (DFI_combine
, decl
);
3265 rebuild_jump_labels_after_combine
3266 = combine_instructions (insns
, max_reg_num ());
3268 /* Combining insns may have turned an indirect jump into a
3269 direct jump. Rebuid the JUMP_LABEL fields of jumping
3271 if (rebuild_jump_labels_after_combine
)
3273 timevar_push (TV_JUMP
);
3274 rebuild_jump_labels (insns
);
3275 timevar_pop (TV_JUMP
);
3277 timevar_push (TV_FLOW
);
3278 purge_all_dead_edges ();
3279 cleanup_cfg (CLEANUP_EXPENSIVE
);
3281 /* Blimey. We've got to have the CFG up to date for the call to
3282 if_convert below. However, the random deletion of blocks
3283 without updating life info can wind up with Wierd Stuff in
3284 global_live_at_end. We then run sched1, which updates things
3285 properly, discovers the wierdness and aborts. */
3286 allocate_bb_life_data ();
3287 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3288 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3289 | PROP_SCAN_DEAD_CODE
);
3291 timevar_pop (TV_FLOW
);
3294 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3295 timevar_pop (TV_COMBINE
);
3300 /* Rerun if-conversion, as combine may have simplified things enough to
3301 now meet sequence length restrictions. */
3304 timevar_push (TV_IFCVT
);
3305 open_dump_file (DFI_ce
, decl
);
3311 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3312 timevar_pop (TV_IFCVT
);
3315 /* Register allocation pre-pass, to reduce number of moves
3316 necessary for two-address machines. */
3317 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3319 timevar_push (TV_REGMOVE
);
3320 open_dump_file (DFI_regmove
, decl
);
3322 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3324 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3325 timevar_pop (TV_REGMOVE
);
3330 /* Do unconditional splitting before register allocation to allow machine
3331 description to add extra information not needed previously. */
3332 split_all_insns (1);
3334 /* Any of the several passes since flow1 will have munged register
3335 lifetime data a bit. */
3336 register_life_up_to_date
= 0;
3338 #ifdef OPTIMIZE_MODE_SWITCHING
3339 timevar_push (TV_GCSE
);
3342 if (optimize_mode_switching (NULL
))
3344 /* We did work, and so had to regenerate global life information.
3345 Take advantage of this and don't re-recompute register life
3346 information below. */
3347 register_life_up_to_date
= 1;
3351 timevar_pop (TV_GCSE
);
3354 timevar_push (TV_SCHED
);
3356 #ifdef INSN_SCHEDULING
3358 /* Print function header into sched dump now
3359 because doing the sched analysis makes some of the dump. */
3360 if (optimize
> 0 && flag_schedule_insns
)
3362 open_dump_file (DFI_sched
, decl
);
3364 /* Do control and data sched analysis,
3365 and write some of the results to dump file. */
3367 schedule_insns (rtl_dump_file
);
3369 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3371 /* Register lifetime information was updated as part of verifying
3373 register_life_up_to_date
= 1;
3376 timevar_pop (TV_SCHED
);
3380 /* Determine if the current function is a leaf before running reload
3381 since this can impact optimizations done by the prologue and
3382 epilogue thus changing register elimination offsets. */
3383 current_function_is_leaf
= leaf_function_p ();
3385 timevar_push (TV_LOCAL_ALLOC
);
3386 open_dump_file (DFI_lreg
, decl
);
3388 /* Allocate pseudo-regs that are used only within 1 basic block.
3390 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3391 jump optimizer after register allocation and reloading are finished. */
3393 if (! register_life_up_to_date
)
3394 recompute_reg_usage (insns
, ! optimize_size
);
3395 regclass (insns
, max_reg_num (), rtl_dump_file
);
3396 rebuild_label_notes_after_reload
= local_alloc ();
3398 timevar_pop (TV_LOCAL_ALLOC
);
3400 if (dump_file
[DFI_lreg
].enabled
)
3402 timevar_push (TV_DUMP
);
3404 dump_flow_info (rtl_dump_file
);
3405 dump_local_alloc (rtl_dump_file
);
3407 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3408 timevar_pop (TV_DUMP
);
3413 timevar_push (TV_GLOBAL_ALLOC
);
3414 open_dump_file (DFI_greg
, decl
);
3416 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3417 pass fixing up any insns that are invalid. */
3420 failure
= global_alloc (rtl_dump_file
);
3423 build_insn_chain (insns
);
3424 failure
= reload (insns
, 0);
3427 timevar_pop (TV_GLOBAL_ALLOC
);
3429 if (dump_file
[DFI_greg
].enabled
)
3431 timevar_push (TV_DUMP
);
3433 dump_global_regs (rtl_dump_file
);
3435 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3436 timevar_pop (TV_DUMP
);
3440 goto exit_rest_of_compilation
;
3444 open_dump_file (DFI_postreload
, decl
);
3446 /* Do a very simple CSE pass over just the hard registers. */
3449 timevar_push (TV_RELOAD_CSE_REGS
);
3450 reload_cse_regs (insns
);
3451 timevar_pop (TV_RELOAD_CSE_REGS
);
3454 /* Register allocation and reloading may have turned an indirect jump into
3455 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3456 jumping instructions. */
3457 if (rebuild_label_notes_after_reload
)
3459 timevar_push (TV_JUMP
);
3461 rebuild_jump_labels (insns
);
3463 timevar_pop (TV_JUMP
);
3466 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3468 /* Re-create the death notes which were deleted during reload. */
3469 timevar_push (TV_FLOW2
);
3470 open_dump_file (DFI_flow2
, decl
);
3472 #ifdef ENABLE_CHECKING
3473 verify_flow_info ();
3476 compute_bb_for_insn (get_max_uid ());
3478 /* If optimizing, then go ahead and split insns now. */
3480 split_all_insns (0);
3482 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3484 /* On some machines, the prologue and epilogue code, or parts thereof,
3485 can be represented as RTL. Doing so lets us schedule insns between
3486 it and the rest of the code and also allows delayed branch
3487 scheduling to operate in the epilogue. */
3488 thread_prologue_and_epilogue_insns (insns
);
3492 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_CROSSJUMP
);
3493 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3495 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3496 even for machines with possibly nonzero RETURN_POPS_ARGS
3497 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3498 push instructions will have popping returns. */
3499 #ifndef PUSH_ROUNDING
3500 if (!ACCUMULATE_OUTGOING_ARGS
)
3502 combine_stack_adjustments ();
3507 flow2_completed
= 1;
3509 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3510 timevar_pop (TV_FLOW2
);
3512 #ifdef HAVE_peephole2
3513 if (optimize
> 0 && flag_peephole2
)
3515 timevar_push (TV_PEEPHOLE2
);
3516 open_dump_file (DFI_peephole2
, decl
);
3518 peephole2_optimize (rtl_dump_file
);
3520 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3521 timevar_pop (TV_PEEPHOLE2
);
3525 if (optimize
> 0 && flag_rename_registers
)
3527 timevar_push (TV_RENAME_REGISTERS
);
3528 open_dump_file (DFI_rnreg
, decl
);
3530 regrename_optimize ();
3532 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3533 timevar_pop (TV_RENAME_REGISTERS
);
3538 timevar_push (TV_IFCVT2
);
3539 open_dump_file (DFI_ce2
, decl
);
3543 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3544 timevar_pop (TV_IFCVT2
);
3548 split_all_insns (1);
3551 #ifdef INSN_SCHEDULING
3552 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3554 timevar_push (TV_SCHED2
);
3555 open_dump_file (DFI_sched2
, decl
);
3557 /* Do control and data sched analysis again,
3558 and write some more of the results to dump file. */
3560 split_all_insns (1);
3562 schedule_insns (rtl_dump_file
);
3564 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3565 timevar_pop (TV_SCHED2
);
3571 #ifdef LEAF_REGISTERS
3572 current_function_uses_only_leaf_regs
3573 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3577 timevar_push (TV_REG_STACK
);
3578 open_dump_file (DFI_stack
, decl
);
3580 reg_to_stack (insns
, rtl_dump_file
);
3582 close_dump_file (DFI_stack
, print_rtl
, insns
);
3583 timevar_pop (TV_REG_STACK
);
3589 timevar_push (TV_REORDER_BLOCKS
);
3590 open_dump_file (DFI_bbro
, decl
);
3592 /* Last attempt to optimize CFG, as life analyzis possibly removed
3593 some instructions. */
3594 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3595 | CLEANUP_CROSSJUMP
);
3596 if (flag_reorder_blocks
)
3598 reorder_basic_blocks ();
3599 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3602 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3603 timevar_pop (TV_REORDER_BLOCKS
);
3606 /* If a machine dependent reorganization is needed, call it. */
3607 #ifdef MACHINE_DEPENDENT_REORG
3608 open_dump_file (DFI_mach
, decl
);
3610 MACHINE_DEPENDENT_REORG (insns
);
3612 close_dump_file (DFI_mach
, print_rtl
, insns
);
3617 /* CFG no longer kept up to date. */
3619 purge_line_number_notes (insns
);
3620 cleanup_barriers ();
3622 /* If a scheduling pass for delayed branches is to be done,
3623 call the scheduling code. */
3626 if (optimize
> 0 && flag_delayed_branch
)
3628 timevar_push (TV_DBR_SCHED
);
3629 open_dump_file (DFI_dbr
, decl
);
3631 dbr_schedule (insns
, rtl_dump_file
);
3633 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3634 timevar_pop (TV_DBR_SCHED
);
3640 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3641 timevar_push (TV_SHORTEN_BRANCH
);
3642 split_all_insns_noflow ();
3643 timevar_pop (TV_SHORTEN_BRANCH
);
3646 convert_to_eh_region_ranges ();
3648 /* Shorten branches. */
3649 timevar_push (TV_SHORTEN_BRANCH
);
3650 shorten_branches (get_insns ());
3651 timevar_pop (TV_SHORTEN_BRANCH
);
3653 current_function_nothrow
= nothrow_function_p ();
3654 if (current_function_nothrow
)
3655 /* Now we know that this can't throw; set the flag for the benefit
3656 of other functions later in this translation unit. */
3657 TREE_NOTHROW (current_function_decl
) = 1;
3659 /* Now turn the rtl into assembler code. */
3661 timevar_push (TV_FINAL
);
3666 /* Get the function's name, as described by its RTL. This may be
3667 different from the DECL_NAME name used in the source file. */
3669 x
= DECL_RTL (decl
);
3670 if (GET_CODE (x
) != MEM
)
3673 if (GET_CODE (x
) != SYMBOL_REF
)
3675 fnname
= XSTR (x
, 0);
3677 assemble_start_function (decl
, fnname
);
3678 final_start_function (insns
, asm_out_file
, optimize
);
3679 final (insns
, asm_out_file
, optimize
, 0);
3680 final_end_function ();
3682 #ifdef IA64_UNWIND_INFO
3683 /* ??? The IA-64 ".handlerdata" directive must be issued before
3684 the ".endp" directive that closes the procedure descriptor. */
3685 output_function_exception_table ();
3688 assemble_end_function (decl
, fnname
);
3690 #ifndef IA64_UNWIND_INFO
3691 /* Otherwise, it feels unclean to switch sections in the middle. */
3692 output_function_exception_table ();
3696 fflush (asm_out_file
);
3698 /* Release all memory allocated by flow. */
3699 free_basic_block_vars (0);
3701 /* Release all memory held by regsets now. */
3702 regset_release_memory ();
3704 timevar_pop (TV_FINAL
);
3708 /* Write DBX symbols if requested. */
3710 /* Note that for those inline functions where we don't initially
3711 know for certain that we will be generating an out-of-line copy,
3712 the first invocation of this routine (rest_of_compilation) will
3713 skip over this code by doing a `goto exit_rest_of_compilation;'.
3714 Later on, finish_compilation will call rest_of_compilation again
3715 for those inline functions that need to have out-of-line copies
3716 generated. During that call, we *will* be routed past here. */
3718 timevar_push (TV_SYMOUT
);
3719 (*debug_hooks
->function_decl
) (decl
);
3720 timevar_pop (TV_SYMOUT
);
3722 exit_rest_of_compilation
:
3724 /* In case the function was not output,
3725 don't leave any temporary anonymous types
3726 queued up for sdb output. */
3727 #ifdef SDB_DEBUGGING_INFO
3728 if (write_symbols
== SDB_DEBUG
)
3729 sdbout_types (NULL_TREE
);
3732 reload_completed
= 0;
3733 flow2_completed
= 0;
3736 timevar_push (TV_FINAL
);
3738 /* Clear out the insn_length contents now that they are no
3740 init_insn_lengths ();
3742 /* Clear out the real_constant_chain before some of the rtx's
3743 it runs through become garbage. */
3744 clear_const_double_mem ();
3746 /* Show no temporary slots allocated. */
3749 free_basic_block_vars (0);
3751 timevar_pop (TV_FINAL
);
3753 /* Make sure volatile mem refs aren't considered valid operands for
3754 arithmetic insns. We must call this here if this is a nested inline
3755 function, since the above code leaves us in the init_recog state
3756 (from final.c), and the function context push/pop code does not
3757 save/restore volatile_ok.
3759 ??? Maybe it isn't necessary for expand_start_function to call this
3760 anymore if we do it here? */
3762 init_recog_no_volatile ();
3764 /* We're done with this function. Free up memory if we can. */
3765 free_after_parsing (cfun
);
3766 if (! DECL_DEFER_OUTPUT (decl
))
3767 free_after_compilation (cfun
);
3772 timevar_pop (TV_REST_OF_COMPILATION
);
3782 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3783 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3784 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3785 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3786 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3787 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"));
3789 for (i
= ARRAY_SIZE (f_options
); i
--;)
3791 const char *description
= f_options
[i
].description
;
3793 if (description
!= NULL
&& * description
!= 0)
3794 printf (" -f%-21s %s\n",
3795 f_options
[i
].string
, _(description
));
3798 printf (_(" -O[number] Set optimisation level to [number]\n"));
3799 printf (_(" -Os Optimise for space rather than speed\n"));
3800 for (i
= LAST_PARAM
; i
--;)
3802 const char *description
= compiler_params
[i
].help
;
3803 const int length
= 21-strlen(compiler_params
[i
].option
);
3805 if (description
!= NULL
&& * description
!= 0)
3806 printf (" --param %s=<value>%.*s%s\n",
3807 compiler_params
[i
].option
,
3808 length
> 0 ? length
: 1, " ",
3811 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3812 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3813 printf (_(" -w Suppress warnings\n"));
3814 printf (_(" -W Enable extra warnings\n"));
3816 for (i
= ARRAY_SIZE (W_options
); i
--;)
3818 const char *description
= W_options
[i
].description
;
3820 if (description
!= NULL
&& * description
!= 0)
3821 printf (" -W%-21s %s\n",
3822 W_options
[i
].string
, _(description
));
3825 printf (_(" -Wunused Enable unused warnings\n"));
3826 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3827 printf (_(" -p Enable function profiling\n"));
3828 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3829 printf (_(" -a Enable block profiling \n"));
3831 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3832 printf (_(" -ax Enable jump profiling \n"));
3834 printf (_(" -o <file> Place output into <file> \n"));
3836 -G <number> Put global and static data smaller than <number>\n\
3837 bytes into a special section (on some targets)\n"));
3839 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3841 if (debug_args
[i
].description
!= NULL
)
3842 printf (" -g%-21s %s\n",
3843 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3846 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3847 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3848 printf (_(" -version Display the compiler's version\n"));
3849 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3850 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3851 #if defined INSN_SCHEDULING
3852 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3854 printf (_(" --help Display this information\n"));
3859 /* Display descriptions of language specific options.
3860 If there is no description, note that there is an undocumented option.
3861 If the description is empty, do not display anything. (This allows
3862 options to be deliberately undocumented, for whatever reason).
3863 If the option string is missing, then this is a marker, indicating
3864 that the description string is in fact the name of a language, whose
3865 language specific options are to follow. */
3867 if (ARRAY_SIZE (documented_lang_options
) > 1)
3869 printf (_("\nLanguage specific options:\n"));
3871 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3873 const char *description
= documented_lang_options
[i
].description
;
3874 const char *option
= documented_lang_options
[i
].option
;
3876 if (description
== NULL
)
3881 printf (_(" %-23.23s [undocumented]\n"), option
);
3883 else if (*description
== 0)
3885 else if (option
== NULL
)
3889 (_("\nThere are undocumented %s specific options as well.\n"),
3893 printf (_("\n Options for %s:\n"), description
);
3898 printf (" %-23.23s %s\n", option
, _(description
));
3903 printf (_("\nThere are undocumented %s specific options as well.\n"),
3906 display_target_options ();
3910 display_target_options ()
3914 if (ARRAY_SIZE (target_switches
) > 1
3915 #ifdef TARGET_OPTIONS
3916 || ARRAY_SIZE (target_options
) > 1
3924 printf (_("\nTarget specific options:\n"));
3926 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3928 const char *option
= target_switches
[i
].name
;
3929 const char *description
= target_switches
[i
].description
;
3931 if (option
== NULL
|| *option
== 0)
3933 else if (description
== NULL
)
3938 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3940 else if (* description
!= 0)
3941 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3944 #ifdef TARGET_OPTIONS
3945 for (i
= ARRAY_SIZE (target_options
); i
--;)
3947 const char *option
= target_options
[i
].prefix
;
3948 const char *description
= target_options
[i
].description
;
3950 if (option
== NULL
|| *option
== 0)
3952 else if (description
== NULL
)
3957 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3959 else if (* description
!= 0)
3960 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3966 printf (_("\nThere are undocumented target specific options as well.\n"));
3968 printf (_(" They exist, but they are not documented.\n"));
3973 /* Parse a -d... comand line switch. */
3976 decode_d_option (arg
)
3985 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3986 dump_file
[i
].enabled
= 1;
3992 flag_print_asm_name
= 1;
3995 flag_dump_rtl_in_asm
= 1;
3996 flag_print_asm_name
= 1;
3999 graph_dump_format
= vcg
;
4002 rtl_dump_and_exit
= 1;
4007 case 'D': /* These are handled by the preprocessor. */
4013 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4014 if (c
== dump_file
[i
].debug_switch
)
4016 dump_file
[i
].enabled
= 1;
4021 warning ("unrecognized gcc debugging option: %c", c
);
4026 /* Parse a -f... comand line switch. ARG is the value after the -f.
4027 It is safe to access 'ARG - 2' to generate the full switch name.
4028 Return the number of strings consumed. */
4031 decode_f_option (arg
)
4035 const char *option_value
= NULL
;
4037 /* Search for the option in the table of binary f options. */
4038 for (j
= ARRAY_SIZE (f_options
); j
--;)
4040 if (!strcmp (arg
, f_options
[j
].string
))
4042 *f_options
[j
].variable
= f_options
[j
].on_value
;
4046 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4047 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4049 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4054 if (!strcmp (arg
, "fast-math"))
4055 set_fast_math_flags();
4056 else if (!strcmp (arg
, "no-fast-math"))
4057 set_no_fast_math_flags();
4058 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4059 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4062 read_integral_parameter (option_value
, arg
- 2,
4064 set_param_value ("max-inline-insns", val
);
4066 #ifdef INSN_SCHEDULING
4067 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4068 fix_sched_param ("verbose", option_value
);
4070 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4071 fix_register (option_value
, 1, 1);
4072 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4073 fix_register (option_value
, 0, 1);
4074 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4075 fix_register (option_value
, 0, 0);
4076 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4077 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4078 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4080 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4081 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4082 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4083 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4085 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4086 else if ((option_value
4087 = skip_leading_substring (arg
, "stack-limit-register=")))
4089 int reg
= decode_reg_name (option_value
);
4091 error ("unrecognized register name `%s'", option_value
);
4093 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4095 else if ((option_value
4096 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4099 nm
= ggc_strdup (option_value
);
4100 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4102 else if ((option_value
4103 = skip_leading_substring (arg
, "message-length=")))
4104 output_set_maximum_length
4105 (&global_dc
->buffer
, read_integral_parameter
4106 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4107 else if ((option_value
4108 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4110 if (!strcmp (option_value
, "once"))
4111 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4112 else if (!strcmp (option_value
, "every-line"))
4113 diagnostic_prefixing_rule (global_dc
)
4114 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4116 error ("Unrecognized option `%s'", arg
- 2);
4118 else if (!strcmp (arg
, "no-stack-limit"))
4119 stack_limit_rtx
= NULL_RTX
;
4120 else if (!strcmp (arg
, "preprocessed"))
4121 /* Recognise this switch but do nothing. This prevents warnings
4122 about an unrecognized switch if cpplib has not been linked in. */
4130 /* Parse a -W... comand line switch. ARG is the value after the -W.
4131 It is safe to access 'ARG - 2' to generate the full switch name.
4132 Return the number of strings consumed. */
4135 decode_W_option (arg
)
4138 const char *option_value
= NULL
;
4141 /* Search for the option in the table of binary W options. */
4143 for (j
= ARRAY_SIZE (W_options
); j
--;)
4145 if (!strcmp (arg
, W_options
[j
].string
))
4147 *W_options
[j
].variable
= W_options
[j
].on_value
;
4151 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4152 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4154 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4159 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4160 warning ("-Wid-clash-LEN is no longer supported");
4161 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4163 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4165 warn_larger_than
= larger_than_size
!= -1;
4167 else if (!strcmp (arg
, "unused"))
4171 else if (!strcmp (arg
, "no-unused"))
4181 /* Parse a -g... comand line switch. ARG is the value after the -g.
4182 It is safe to access 'ARG - 2' to generate the full switch name.
4183 Return the number of strings consumed. */
4186 decode_g_option (arg
)
4189 static unsigned level
=0;
4190 /* A lot of code assumes write_symbols == NO_DEBUG if the
4191 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4192 of what debugging type has been selected). This records the
4193 selected type. It is an error to specify more than one
4195 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4196 /* Non-zero if debugging format has been explicitly set.
4197 -g and -ggdb don't explicitly set the debugging format so
4198 -gdwarf -g3 is equivalent to -gdwarf3. */
4199 static int type_explicitly_set_p
= 0;
4200 /* Indexed by enum debug_info_type. */
4201 static const char *debug_type_names
[] =
4203 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4206 /* The maximum admissible debug level value. */
4207 static const unsigned max_debug_level
= 3;
4209 /* Look up ARG in the table. */
4210 for (da
= debug_args
; da
->arg
; da
++)
4212 const int da_len
= strlen (da
->arg
);
4214 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4216 enum debug_info_type type
= da
->debug_type
;
4217 const char *p
= arg
+ da_len
;
4219 if (*p
&& (*p
< '0' || *p
> '9'))
4222 /* A debug flag without a level defaults to level 2.
4223 Note we do not want to call read_integral_parameter
4224 for that case since it will call atoi which
4227 ??? We may want to generalize the interface to
4228 read_integral_parameter to better handle this case
4229 if this case shows up often. */
4231 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4233 level
= (level
== 0) ? 2 : level
;
4235 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4237 error ("use -gdwarf -g%d for DWARF v1, level %d",
4240 error ("use -gdwarf-2 for DWARF v2");
4243 if (level
> max_debug_level
)
4246 ignoring option `%s' due to invalid debug level specification",
4248 level
= debug_info_level
;
4251 if (type
== NO_DEBUG
)
4253 type
= PREFERRED_DEBUGGING_TYPE
;
4255 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4257 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4258 type
= DWARF2_DEBUG
;
4260 #ifdef DBX_DEBUGGING_INFO
4267 if (type
== NO_DEBUG
)
4268 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4270 /* Does it conflict with an already selected type? */
4271 if (type_explicitly_set_p
4272 /* -g/-ggdb don't conflict with anything. */
4273 && da
->debug_type
!= NO_DEBUG
4274 && type
!= selected_debug_type
)
4275 warning ("`%s' ignored, conflicts with `-g%s'",
4276 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4279 /* If the format has already been set, -g/-ggdb
4280 only change the debug level. */
4281 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4282 /* Don't change debugging type. */
4286 selected_debug_type
= type
;
4287 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4290 write_symbols
= (level
== 0
4292 : selected_debug_type
);
4293 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4294 debug_info_level
= (enum debug_info_level
) level
;
4307 /* Decode the first argument in the argv as a language-independent option.
4308 Return the number of strings consumed. */
4311 independent_decode_option (argc
, argv
)
4315 char *arg
= argv
[0];
4317 if (arg
[0] != '-' || arg
[1] == 0)
4329 if (!strcmp (arg
, "-help"))
4332 exit_after_options
= 1;
4335 if (!strcmp (arg
, "-target-help"))
4337 display_target_options ();
4338 exit_after_options
= 1;
4341 if (!strcmp (arg
, "-version"))
4343 print_version (stderr
, "");
4344 exit_after_options
= 1;
4347 /* Handle '--param <name>=<value>'. */
4348 if (strcmp (arg
, "-param") == 0)
4354 error ("-param option missing argument");
4358 /* Get the '<name>=<value>' parameter. */
4360 /* Look for the `='. */
4361 equal
= strchr (arg
, '=');
4363 error ("invalid --param option: %s", arg
);
4368 /* Zero out the `=' sign so that we get two separate strings. */
4370 /* Figure out what value is specified. */
4371 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4372 if (val
!= INVALID_PARAM_VAL
)
4373 set_param_value (arg
, val
);
4375 error ("invalid parameter value `%s'", equal
+ 1);
4390 /* Already been treated in main (). Do nothing. */
4394 set_target_switch (arg
+ 1);
4398 return decode_f_option (arg
+ 1);
4401 return decode_g_option (arg
+ 1);
4404 if (!strcmp (arg
, "dumpbase"))
4409 dump_base_name
= argv
[1];
4413 decode_d_option (arg
+ 1);
4417 if (!strcmp (arg
, "pedantic"))
4419 else if (!strcmp (arg
, "pedantic-errors"))
4420 flag_pedantic_errors
= pedantic
= 1;
4421 else if (arg
[1] == 0)
4428 if (!strcmp (arg
, "quiet"))
4435 if (!strcmp (arg
, "version"))
4443 inhibit_warnings
= 1;
4452 /* We save the value of warn_uninitialized, since if they put
4453 -Wuninitialized on the command line, we need to generate a
4454 warning about not using it without also specifying -O. */
4455 if (warn_uninitialized
!= 1)
4456 warn_uninitialized
= 2;
4459 return decode_W_option (arg
+ 1);
4465 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4466 warning ("`-a' option (basic block profile) not supported");
4468 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4471 else if (!strcmp (arg
, "ax"))
4473 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4474 warning ("`-ax' option (jump profiling) not supported");
4476 profile_block_flag
= (!profile_block_flag
4477 || profile_block_flag
== 2) ? 2 : 3;
4480 else if (!strncmp (arg
, "aux-info", 8))
4487 aux_info_file_name
= argv
[1];
4488 flag_gen_aux_info
= 1;
4491 else if (arg
[8] == '=')
4493 aux_info_file_name
= arg
+ 9;
4494 flag_gen_aux_info
= 1;
4509 asm_file_name
= argv
[1];
4524 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4529 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4533 if (g_switch_val
== -1)
4537 g_switch_set
= TRUE
;
4538 g_switch_value
= g_switch_val
;
4548 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4549 Decode command args, then call compile_file.
4550 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4551 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4553 It is not safe to call this function more than once. */
4556 toplev_main (argc
, argv
)
4563 /* save in case md file wants to emit args as a comment. */
4567 p
= argv
[0] + strlen (argv
[0]);
4568 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4572 xmalloc_set_program_name (progname
);
4574 /* LC_CTYPE determines the character set used by the terminal so it has be set
4575 to output messages correctly. */
4577 #ifdef HAVE_LC_MESSAGES
4578 setlocale (LC_CTYPE
, "");
4579 setlocale (LC_MESSAGES
, "");
4581 setlocale (LC_ALL
, "");
4584 (void) bindtextdomain (PACKAGE
, localedir
);
4585 (void) textdomain (PACKAGE
);
4587 /* Install handler for SIGFPE, which may be received while we do
4588 compile-time floating point arithmetic. */
4589 signal (SIGFPE
, float_signal
);
4591 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4593 signal (SIGSEGV
, crash_signal
);
4596 signal (SIGILL
, crash_signal
);
4599 signal (SIGBUS
, crash_signal
);
4602 signal (SIGABRT
, crash_signal
);
4604 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4605 signal (SIGIOT
, crash_signal
);
4608 decl_printable_name
= decl_name
;
4609 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4611 /* Initialize whether `char' is signed. */
4612 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4613 #ifdef DEFAULT_SHORT_ENUMS
4614 /* Initialize how much space enums occupy, by default. */
4615 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4618 /* Initialize the garbage-collector. */
4621 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4622 ggc_add_tree_root (¤t_function_decl
, 1);
4623 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4625 /* Initialize the diagnostics reporting machinery. */
4626 diagnostic_initialize (global_dc
);
4628 /* Register the language-independent parameters. */
4629 add_params (lang_independent_params
, LAST_PARAM
);
4631 /* Perform language-specific options intialization. */
4632 if (lang_hooks
.init_options
)
4633 (*lang_hooks
.init_options
) ();
4635 /* Scan to see what optimization level has been specified. That will
4636 determine the default value of many flags. */
4637 for (i
= 1; i
< argc
; i
++)
4639 if (!strcmp (argv
[i
], "-O"))
4644 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4646 /* Handle -Os, -O2, -O3, -O69, ... */
4647 char *p
= &argv
[i
][2];
4649 if ((p
[0] == 's') && (p
[1] == 0))
4653 /* Optimizing for size forces optimize to be 2. */
4658 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4659 if (optimize_val
!= -1)
4661 optimize
= optimize_val
;
4671 flag_thread_jumps
= 1;
4673 flag_delayed_branch
= 1;
4675 #ifdef CAN_DEBUG_WITHOUT_FP
4676 flag_omit_frame_pointer
= 1;
4678 flag_guess_branch_prob
= 1;
4683 flag_optimize_sibling_calls
= 1;
4684 flag_cse_follow_jumps
= 1;
4685 flag_cse_skip_blocks
= 1;
4687 flag_expensive_optimizations
= 1;
4688 flag_strength_reduce
= 1;
4689 flag_rerun_cse_after_loop
= 1;
4690 flag_rerun_loop_opt
= 1;
4691 flag_caller_saves
= 1;
4694 #ifdef INSN_SCHEDULING
4695 flag_schedule_insns
= 1;
4696 flag_schedule_insns_after_reload
= 1;
4699 flag_strict_aliasing
= 1;
4700 flag_delete_null_pointer_checks
= 1;
4701 flag_reorder_blocks
= 1;
4706 flag_inline_functions
= 1;
4707 flag_rename_registers
= 1;
4710 if (optimize
< 2 || optimize_size
)
4715 align_functions
= 1;
4718 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4721 set_target_switch ("");
4723 /* Unwind tables are always present in an ABI-conformant IA-64
4724 object file, so the default should be ON. */
4725 #ifdef IA64_UNWIND_INFO
4726 flag_unwind_tables
= IA64_UNWIND_INFO
;
4729 #ifdef OPTIMIZATION_OPTIONS
4730 /* Allow default optimizations to be specified on a per-machine basis. */
4731 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4734 /* Initialize register usage now so switches may override. */
4737 /* Perform normal command line switch decoding. */
4738 for (i
= 1; i
< argc
;)
4741 int indep_processed
;
4743 /* Give the language a chance to decode the option for itself. */
4744 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4746 if (lang_processed
>= 0)
4747 /* Now see if the option also has a language independent meaning.
4748 Some options are both language specific and language independent,
4750 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4753 lang_processed
= -lang_processed
;
4754 indep_processed
= 0;
4757 if (lang_processed
|| indep_processed
)
4758 i
+= MAX (lang_processed
, indep_processed
);
4761 const char *option
= NULL
;
4762 const char *lang
= NULL
;
4765 /* It is possible that the command line switch is not valid for the
4766 current language, but it is valid for another language. In order
4767 to be compatible with previous versions of the compiler (which
4768 did not issue an error message in this case) we check for this
4769 possibility here. If we do find a match, then if extra_warnings
4770 is set we generate a warning message, otherwise we will just
4771 ignore the option. */
4772 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4774 option
= documented_lang_options
[j
].option
;
4777 lang
= documented_lang_options
[j
].description
;
4778 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4782 if (j
!= ARRAY_SIZE (documented_lang_options
))
4786 warning ("Ignoring command line option '%s'", argv
[i
]);
4789 ("(It is valid for %s but not the selected language)",
4793 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4794 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4796 error ("Unrecognized option `%s'", argv
[i
]);
4802 /* All command line options have been processed. */
4803 if (lang_hooks
.post_options
)
4804 (*lang_hooks
.post_options
) ();
4806 if (exit_after_options
)
4809 /* Checker uses the frame pointer. */
4810 if (flag_check_memory_usage
)
4811 flag_omit_frame_pointer
= 0;
4815 /* Inlining does not work if not optimizing,
4816 so force it not to be done. */
4820 /* The c_decode_option function and decode_option hook set
4821 this to `2' if -Wall is used, so we can avoid giving out
4822 lots of errors for people who don't realize what -Wall does. */
4823 if (warn_uninitialized
== 1)
4824 warning ("-Wuninitialized is not supported without -O");
4827 /* We do not currently support sibling-call optimization in the
4828 presence of exceptions. See PR2975 for a test-case that will
4829 fail if we try to combine both of these features. */
4830 if (flag_exceptions
)
4831 flag_optimize_sibling_calls
= 0;
4833 #ifdef OVERRIDE_OPTIONS
4834 /* Some machines may reject certain combinations of options. */
4838 /* Set up the align_*_log variables, defaulting them to 1 if they
4839 were still unset. */
4840 if (align_loops
<= 0) align_loops
= 1;
4841 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4842 if (align_jumps
<= 0) align_jumps
= 1;
4843 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4844 if (align_labels
<= 0) align_labels
= 1;
4845 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4846 if (align_functions
<= 0) align_functions
= 1;
4847 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4849 if (profile_block_flag
== 3)
4851 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4852 profile_block_flag
= 2;
4855 /* Unrolling all loops implies that standard loop unrolling must also
4857 if (flag_unroll_all_loops
)
4858 flag_unroll_loops
= 1;
4859 /* Loop unrolling requires that strength_reduction be on also. Silently
4860 turn on strength reduction here if it isn't already on. Also, the loop
4861 unrolling code assumes that cse will be run after loop, so that must
4862 be turned on also. */
4863 if (flag_unroll_loops
)
4865 flag_strength_reduce
= 1;
4866 flag_rerun_cse_after_loop
= 1;
4869 /* Warn about options that are not supported on this machine. */
4870 #ifndef INSN_SCHEDULING
4871 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4872 warning ("instruction scheduling not supported on this target machine");
4875 if (flag_delayed_branch
)
4876 warning ("this target machine does not have delayed branches");
4879 /* Some operating systems do not allow profiling without a frame
4881 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4883 && flag_omit_frame_pointer
)
4885 error ("profiling does not work without a frame pointer");
4886 flag_omit_frame_pointer
= 0;
4889 user_label_prefix
= USER_LABEL_PREFIX
;
4890 if (flag_leading_underscore
!= -1)
4892 /* If the default prefix is more complicated than "" or "_",
4893 issue a warning and ignore this option. */
4894 if (user_label_prefix
[0] == 0 ||
4895 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4897 user_label_prefix
= flag_leading_underscore
? "_" : "";
4900 warning ("-f%sleading-underscore not supported on this target machine",
4901 flag_leading_underscore
? "" : "no-");
4904 /* If we are in verbose mode, write out the version and maybe all the
4905 option flags in use. */
4908 print_version (stderr
, "");
4910 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4913 compile_file (filename
);
4916 return (FATAL_EXIT_CODE
);
4918 return (FATAL_EXIT_CODE
);
4919 return (SUCCESS_EXIT_CODE
);
4922 /* Decode -m switches. */
4923 /* Decode the switch -mNAME. */
4926 set_target_switch (name
)
4930 int valid_target_option
= 0;
4932 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4933 if (!strcmp (target_switches
[j
].name
, name
))
4935 if (target_switches
[j
].value
< 0)
4936 target_flags
&= ~-target_switches
[j
].value
;
4938 target_flags
|= target_switches
[j
].value
;
4939 valid_target_option
= 1;
4942 #ifdef TARGET_OPTIONS
4943 if (!valid_target_option
)
4944 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4946 int len
= strlen (target_options
[j
].prefix
);
4947 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4949 *target_options
[j
].variable
= name
+ len
;
4950 valid_target_option
= 1;
4955 if (!valid_target_option
)
4956 error ("Invalid option `%s'", name
);
4959 /* Print version information to FILE.
4960 Each line begins with INDENT (for the case where FILE is the
4961 assembler output file). */
4964 print_version (file
, indent
)
4969 #define __VERSION__ "[?]"
4973 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4975 "%s%s%s version %s (%s) compiled by CC.\n"
4977 , indent
, *indent
!= 0 ? " " : "",
4978 language_string
, version_string
, TARGET_NAME
,
4979 indent
, __VERSION__
);
4982 /* Print an option value and return the adjusted position in the line.
4983 ??? We don't handle error returns from fprintf (disk full); presumably
4984 other code will catch a disk full though. */
4987 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
4990 const char *indent
, *sep
, *term
, *type
, *name
;
4992 /* The ultrix fprintf returns 0 on success, so compute the result we want
4993 here since we need it for the following test. */
4994 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
4999 fprintf (file
, "%s", term
);
5004 fprintf (file
, "%s", indent
);
5005 pos
= strlen (indent
);
5007 fprintf (file
, "%s%s%s", sep
, type
, name
);
5012 /* Print active target switches to FILE.
5013 POS is the current cursor position and MAX is the size of a "line".
5014 Each line begins with INDENT and ends with TERM.
5015 Each switch is separated from the next by SEP. */
5018 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5021 const char *indent
, *sep
, *term
;
5026 /* Print the options as passed. */
5028 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5029 _("options passed: "), "");
5031 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5035 if (strcmp (*p
, "-o") == 0)
5041 if (strcmp (*p
, "-quiet") == 0)
5043 if (strcmp (*p
, "-version") == 0)
5048 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5051 fprintf (file
, "%s", term
);
5053 /* Print the -f and -m options that have been enabled.
5054 We don't handle language specific options but printing argv
5057 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5058 _("options enabled: "), "");
5060 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5061 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5062 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5063 "-f", f_options
[j
].string
);
5065 /* Print target specific options. */
5067 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5068 if (target_switches
[j
].name
[0] != '\0'
5069 && target_switches
[j
].value
> 0
5070 && ((target_switches
[j
].value
& target_flags
)
5071 == target_switches
[j
].value
))
5073 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5074 "-m", target_switches
[j
].name
);
5077 #ifdef TARGET_OPTIONS
5078 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5079 if (*target_options
[j
].variable
!= NULL
)
5082 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5083 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5084 prefix
, *target_options
[j
].variable
);
5088 fprintf (file
, "%s", term
);