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"
68 #ifdef DWARF_DEBUGGING_INFO
72 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
73 #include "dwarf2out.h"
76 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
80 #ifdef SDB_DEBUGGING_INFO
84 #ifdef XCOFF_DEBUGGING_INFO
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 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension
;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch
;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p
;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
285 /* Describes all the dump files. Should be kept in order of the
286 pass and in sync with dump_file_index above.
288 Remaining -d letters:
294 struct dump_file_info dump_file
[DFI_MAX
] =
296 { "rtl", 'r', 0, 0, 0 },
297 { "sibling", 'i', 0, 0, 0 },
298 { "eh", 'h', 0, 0, 0 },
299 { "jump", 'j', 0, 0, 0 },
300 { "cse", 's', 0, 0, 0 },
301 { "addressof", 'F', 0, 0, 0 },
302 { "ssa", 'e', 1, 0, 0 },
303 { "dce", 'X', 1, 0, 0 },
304 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
305 { "gcse", 'G', 1, 0, 0 },
306 { "loop", 'L', 1, 0, 0 },
307 { "cse2", 't', 1, 0, 0 },
308 { "cfg", 'f', 1, 0, 0 },
309 { "bp", 'b', 1, 0, 0 },
310 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
311 { "combine", 'c', 1, 0, 0 },
312 { "ce", 'C', 1, 0, 0 },
313 { "regmove", 'N', 1, 0, 0 },
314 { "sched", 'S', 1, 0, 0 },
315 { "lreg", 'l', 1, 0, 0 },
316 { "greg", 'g', 1, 0, 0 },
317 { "postreload", 'o', 1, 0, 0 },
318 { "flow2", 'w', 1, 0, 0 },
319 { "peephole2", 'z', 1, 0, 0 },
320 { "rnreg", 'n', 1, 0, 0 },
321 { "ce2", 'E', 1, 0, 0 },
322 { "sched2", 'R', 1, 0, 0 },
323 { "bbro", 'B', 1, 0, 0 },
324 { "jump2", 'J', 1, 0, 0 },
325 { "mach", 'M', 1, 0, 0 },
326 { "dbr", 'd', 0, 0, 0 },
327 { "stack", 'k', 1, 0, 0 },
330 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
331 static void close_dump_file
PARAMS ((enum dump_file_index
,
332 void (*) (FILE *, rtx
), rtx
));
334 /* Other flags saying which kinds of debugging dump have been requested. */
336 int rtl_dump_and_exit
;
337 int flag_print_asm_name
;
338 static int version_flag
;
339 static char *filename
;
340 enum graph_dump_types graph_dump_format
;
342 /* Name for output file of assembly code, specified with -o. */
346 /* Value of the -G xx switch, and whether it was passed or not. */
350 /* Type(s) of debugging information we are producing (if any).
351 See flags.h for the definitions of the different possible
352 types of debugging information. */
353 enum debug_info_type write_symbols
= NO_DEBUG
;
355 /* Level of debugging information we are producing. See flags.h
356 for the definitions of the different possible levels. */
357 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
359 /* Nonzero means use GNU-only extensions in the generated symbolic
360 debugging information. */
361 /* Currently, this only has an effect when write_symbols is set to
362 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
363 int use_gnu_debug_info_extensions
= 0;
365 /* Nonzero means do optimizations. -O.
366 Particular numeric values stand for particular amounts of optimization;
367 thus, -O2 stores 2 here. However, the optimizations beyond the basic
368 ones are not controlled directly by this variable. Instead, they are
369 controlled by individual `flag_...' variables that are defaulted
370 based on this variable. */
374 /* Nonzero means optimize for size. -Os.
375 The only valid values are zero and non-zero. When optimize_size is
376 non-zero, optimize defaults to 2, but certain individual code
377 bloating optimizations are disabled. */
379 int optimize_size
= 0;
381 /* Number of error messages and warning messages so far. */
384 int warningcount
= 0;
387 /* Nonzero if we should exit after parsing options. */
388 static int exit_after_options
= 0;
390 /* The FUNCTION_DECL for the function currently being compiled,
391 or 0 if between functions. */
392 tree current_function_decl
;
394 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
396 tree current_function_func_begin_label
;
398 /* Pointer to function to compute the name to use to print a declaration.
399 DECL is the declaration in question.
400 VERBOSITY determines what information will be printed:
401 0: DECL_NAME, demangled as necessary.
402 1: and scope information.
403 2: and any other information that might be interesting, such as function
404 parameter types in C++. */
406 const char *(*decl_printable_name
) PARAMS ((tree
, int));
408 /* Pointer to function to compute rtl for a language-specific tree code. */
410 typedef rtx (*lang_expand_expr_t
)
411 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
412 enum expand_modifier modifier
));
414 lang_expand_expr_t lang_expand_expr
= 0;
416 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
418 /* Pointer to function to finish handling an incomplete decl at the
419 end of compilation. */
421 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
423 /* Nonzero if doing dwarf2 duplicate elimination. */
425 int flag_eliminate_dwarf2_dups
= 0;
427 /* Nonzero if generating code to do profiling. */
429 int profile_flag
= 0;
431 /* Nonzero if generating code to do profiling on a line-by-line basis. */
433 int profile_block_flag
;
435 /* Nonzero if generating code to profile program flow graph arcs. */
437 int profile_arc_flag
= 0;
439 /* Nonzero if generating info for gcov to calculate line test coverage. */
441 int flag_test_coverage
= 0;
443 /* Nonzero indicates that branch taken probabilities should be calculated. */
445 int flag_branch_probabilities
= 0;
447 /* Nonzero if basic blocks should be reordered. */
449 int flag_reorder_blocks
= 0;
451 /* Nonzero if registers should be renamed. */
453 int flag_rename_registers
= 0;
455 /* Nonzero for -pedantic switch: warn about anything
456 that standard spec forbids. */
460 /* Temporarily suppress certain warnings.
461 This is set while reading code from a system header file. */
463 int in_system_header
= 0;
465 /* Don't print functions as they are compiled. -quiet. */
469 /* Print times taken by the various passes. -ftime-report. */
473 /* Print memory still in use at end of compilation (which may have little
474 to do with peak memory consumption). -fmem-report. */
478 /* Non-zero means to collect statistics which might be expensive
479 and to print them when we are done. */
480 int flag_detailed_statistics
= 0;
485 /* Nonzero means `char' should be signed. */
487 int flag_signed_char
;
489 /* Nonzero means give an enum type only as many bytes as it needs. */
491 int flag_short_enums
;
493 /* Nonzero for -fcaller-saves: allocate values in regs that need to
494 be saved across function calls, if that produces overall better code.
495 Optional now, so people can test it. */
497 #ifdef DEFAULT_CALLER_SAVES
498 int flag_caller_saves
= 1;
500 int flag_caller_saves
= 0;
503 /* Nonzero if structures and unions should be returned in memory.
505 This should only be defined if compatibility with another compiler or
506 with an ABI is needed, because it results in slower code. */
508 #ifndef DEFAULT_PCC_STRUCT_RETURN
509 #define DEFAULT_PCC_STRUCT_RETURN 1
512 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
514 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
516 /* Nonzero for -fforce-mem: load memory value into a register
517 before arithmetic on it. This makes better cse but slower compilation. */
519 int flag_force_mem
= 0;
521 /* Nonzero for -fforce-addr: load memory address into a register before
522 reference to memory. This makes better cse but slower compilation. */
524 int flag_force_addr
= 0;
526 /* Nonzero for -fdefer-pop: don't pop args after each function call;
527 instead save them up to pop many calls' args with one insns. */
529 int flag_defer_pop
= 0;
531 /* Nonzero for -ffloat-store: don't allocate floats and doubles
532 in extended-precision registers. */
534 int flag_float_store
= 0;
536 /* Nonzero for -fcse-follow-jumps:
537 have cse follow jumps to do a more extensive job. */
539 int flag_cse_follow_jumps
;
541 /* Nonzero for -fcse-skip-blocks:
542 have cse follow a branch around a block. */
543 int flag_cse_skip_blocks
;
545 /* Nonzero for -fexpensive-optimizations:
546 perform miscellaneous relatively-expensive optimizations. */
547 int flag_expensive_optimizations
;
549 /* Nonzero for -fthread-jumps:
550 have jump optimize output of loop. */
552 int flag_thread_jumps
;
554 /* Nonzero enables strength-reduction in loop.c. */
556 int flag_strength_reduce
= 0;
558 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
559 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
560 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
563 int flag_unroll_loops
;
565 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
566 This is generally not a win. */
568 int flag_unroll_all_loops
;
570 /* Nonzero forces all invariant computations in loops to be moved
573 int flag_move_all_movables
= 0;
575 /* Nonzero forces all general induction variables in loops to be
578 int flag_reduce_all_givs
= 0;
580 /* Nonzero to perform full register move optimization passes. This is the
583 int flag_regmove
= 0;
585 /* Nonzero for -fwritable-strings:
586 store string constants in data segment and don't uniquize them. */
588 int flag_writable_strings
= 0;
590 /* Nonzero means don't put addresses of constant functions in registers.
591 Used for compiling the Unix kernel, where strange substitutions are
592 done on the assembly output. */
594 int flag_no_function_cse
= 0;
596 /* Nonzero for -fomit-frame-pointer:
597 don't make a frame pointer in simple functions that don't require one. */
599 int flag_omit_frame_pointer
= 0;
601 /* Nonzero means place each function into its own section on those platforms
602 which support arbitrary section names and unlimited numbers of sections. */
604 int flag_function_sections
= 0;
606 /* ... and similar for data. */
608 int flag_data_sections
= 0;
610 /* Nonzero to inhibit use of define_optimization peephole opts. */
612 int flag_no_peephole
= 0;
614 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
616 int flag_optimize_sibling_calls
= 0;
618 /* Nonzero means the front end generally wants `errno' maintained by math
619 operations, like built-in SQRT. */
621 int flag_errno_math
= 1;
623 /* Nonzero means that unsafe floating-point math optimizations are allowed
624 for the sake of speed. IEEE compliance is not guaranteed, and operations
625 are allowed to assume that their arguments and results are "normal"
626 (e.g., nonnegative for SQRT). */
628 int flag_unsafe_math_optimizations
= 0;
630 /* Zero means that floating-point math operations cannot generate a
631 (user-visible) trap. This is the case, for example, in nonstop
632 IEEE 754 arithmetic. */
634 int flag_trapping_math
= 1;
636 /* 0 means straightforward implementation of complex divide acceptable.
637 1 means wide ranges of inputs must work for complex divide.
638 2 means C99-like requirements for complex divide (not yet implemented). */
640 int flag_complex_divide_method
= 0;
642 /* Nonzero means all references through pointers are volatile. */
646 /* Nonzero means treat all global and extern variables as volatile. */
648 int flag_volatile_global
;
650 /* Nonzero means treat all static variables as volatile. */
652 int flag_volatile_static
;
654 /* Nonzero means just do syntax checking; don't output anything. */
656 int flag_syntax_only
= 0;
658 /* Nonzero means perform global cse. */
660 static int flag_gcse
;
662 /* Nonzero means to use global dataflow analysis to eliminate
663 useless null pointer tests. */
665 static int flag_delete_null_pointer_checks
;
667 /* Nonzero means to do the enhanced load motion during gcse, which trys
668 to hoist loads by not killing them when a store to the same location
671 int flag_gcse_lm
= 1;
673 /* Nonzero means to perform store motion after gcse, which will try to
674 move stores closer to the exit block. Its not very effective without
677 int flag_gcse_sm
= 1;
679 /* Nonzero means to rerun cse after loop optimization. This increases
680 compilation time about 20% and picks up a few more common expressions. */
682 static int flag_rerun_cse_after_loop
;
684 /* Nonzero means to run loop optimizations twice. */
686 int flag_rerun_loop_opt
;
688 /* Nonzero for -finline-functions: ok to inline functions that look like
689 good inline candidates. */
691 int flag_inline_functions
;
693 /* Nonzero for -fkeep-inline-functions: even if we make a function
694 go inline everywhere, keep its definition around for debugging
697 int flag_keep_inline_functions
;
699 /* Nonzero means that functions will not be inlined. */
703 /* Nonzero means that we should emit static const variables
704 regardless of whether or not optimization is turned on. */
706 int flag_keep_static_consts
= 1;
708 /* Nonzero means we should be saving declaration info into a .X file. */
710 int flag_gen_aux_info
= 0;
712 /* Specified name of aux-info file. */
714 static char *aux_info_file_name
;
716 /* Nonzero means make the text shared if supported. */
718 int flag_shared_data
;
720 /* Nonzero means schedule into delayed branch slots if supported. */
722 int flag_delayed_branch
;
724 /* Nonzero if we are compiling pure (sharable) code.
725 Value is 1 if we are doing reasonable (i.e. simple
726 offset into offset table) pic. Value is 2 if we can
727 only perform register offsets. */
731 /* Nonzero means generate extra code for exception handling and enable
732 exception handling. */
736 /* Nonzero means generate frame unwind info table when supported. */
738 int flag_unwind_tables
= 0;
740 /* Nonzero means don't place uninitialized global data in common storage
745 /* Nonzero means pretend it is OK to examine bits of target floats,
746 even if that isn't true. The resulting code will have incorrect constants,
747 but the same series of instructions that the native compiler would make. */
749 int flag_pretend_float
;
751 /* Nonzero means change certain warnings into errors.
752 Usually these are warnings about failure to conform to some standard. */
754 int flag_pedantic_errors
= 0;
756 /* flag_schedule_insns means schedule insns within basic blocks (before
758 flag_schedule_insns_after_reload means schedule insns after
761 int flag_schedule_insns
= 0;
762 int flag_schedule_insns_after_reload
= 0;
764 /* The following flags have effect only for scheduling before register
767 flag_schedule_interblock means schedule insns accross basic blocks.
768 flag_schedule_speculative means allow speculative motion of non-load insns.
769 flag_schedule_speculative_load means allow speculative motion of some
771 flag_schedule_speculative_load_dangerous allows speculative motion of more
774 int flag_schedule_interblock
= 1;
775 int flag_schedule_speculative
= 1;
776 int flag_schedule_speculative_load
= 0;
777 int flag_schedule_speculative_load_dangerous
= 0;
779 int flag_single_precision_constant
;
781 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
782 by a cheaper branch on a count register. */
783 int flag_branch_on_count_reg
= 1;
785 /* -finhibit-size-directive inhibits output of .size for ELF.
786 This is used only for compiling crtstuff.c,
787 and it may be extended to other effects
788 needed for crtstuff.c on other systems. */
789 int flag_inhibit_size_directive
= 0;
791 /* -fverbose-asm causes extra commentary information to be produced in
792 the generated assembly code (to make it more readable). This option
793 is generally only of use to those who actually need to read the
794 generated assembly code (perhaps while debugging the compiler itself).
795 -fno-verbose-asm, the default, causes the extra information
796 to be omitted and is useful when comparing two assembler files. */
798 int flag_verbose_asm
= 0;
800 /* -dA causes debug commentary information to be produced in
801 the generated assembly code (to make it more readable). This option
802 is generally only of use to those who actually need to read the
803 generated assembly code (perhaps while debugging the compiler itself).
804 Currently, this switch is only used by dwarfout.c; however, it is intended
805 to be a catchall for printing debug information in the assembler file. */
807 int flag_debug_asm
= 0;
809 /* -dP causes the rtl to be emitted as a comment in assembly. */
811 int flag_dump_rtl_in_asm
= 0;
813 /* -fgnu-linker specifies use of the GNU linker for initializations.
814 (Or, more generally, a linker that handles initializations.)
815 -fno-gnu-linker says that collect2 will be used. */
817 int flag_gnu_linker
= 0;
819 int flag_gnu_linker
= 1;
825 /* Enable dead code elimination. */
828 /* Tag all structures with __attribute__(packed). */
829 int flag_pack_struct
= 0;
831 /* Emit code to check for stack overflow; also may cause large objects
832 to be allocated dynamically. */
833 int flag_stack_check
;
835 /* When non-NULL, indicates that whenever space is allocated on the
836 stack, the resulting stack pointer must not pass this
837 address---that is, for stacks that grow downward, the stack pointer
838 must always be greater than or equal to this address; for stacks
839 that grow upward, the stack pointer must be less than this address.
840 At present, the rtx may be either a REG or a SYMBOL_REF, although
841 the support provided depends on the backend. */
844 /* -fcheck-memory-usage causes extra code to be generated in order to check
845 memory accesses. This is used by a detector of bad memory accesses such
847 int flag_check_memory_usage
= 0;
849 /* -fprefix-function-name causes function name to be prefixed. This
850 can be used with -fcheck-memory-usage to isolate code compiled with
851 -fcheck-memory-usage. */
852 int flag_prefix_function_name
= 0;
854 /* 0 if pointer arguments may alias each other. True in C.
855 1 if pointer arguments may not alias each other but may alias
857 2 if pointer arguments may not alias each other and may not
858 alias global variables. True in Fortran.
859 This defaults to 0 for C. */
860 int flag_argument_noalias
= 0;
862 /* Nonzero if we should do (language-dependent) alias analysis.
863 Typically, this analysis will assume that expressions of certain
864 types do not alias expressions of certain other types. Only used
865 if alias analysis (in general) is enabled. */
866 int flag_strict_aliasing
= 0;
868 /* Instrument functions with calls at entry and exit, for profiling. */
869 int flag_instrument_function_entry_exit
= 0;
871 /* Nonzero means ignore `#ident' directives. 0 means handle them.
872 On SVR4 targets, it also controls whether or not to emit a
873 string identifying the compiler. */
875 int flag_no_ident
= 0;
877 /* This will perform a peephole pass before sched2. */
878 int flag_peephole2
= 0;
880 /* This will try to guess branch probabilities. */
881 int flag_guess_branch_prob
= 0;
883 /* -fbounded-pointers causes gcc to compile pointers as composite
884 objects occupying three words: the pointer value, the base address
885 of the referent object, and the address immediately beyond the end
886 of the referent object. The base and extent allow us to perform
887 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
888 int flag_bounded_pointers
= 0;
890 /* -fcheck-bounds causes gcc to generate array bounds checks.
891 For C, C++: defaults to value of flag_bounded_pointers.
892 For ObjC: defaults to off.
893 For Java: defaults to on.
894 For Fortran: defaults to off.
895 For CHILL: defaults to off. */
896 int flag_bounds_check
= 0;
898 /* If one, renumber instruction UIDs to reduce the number of
899 unused UIDs if there are a lot of instructions. If greater than
900 one, unconditionally renumber instruction UIDs. */
901 int flag_renumber_insns
= 1;
903 /* Values of the -falign-* flags: how much to align labels in code.
904 0 means `use default', 1 means `don't align'.
905 For each variable, there is an _log variant which is the power
906 of two not less than the variable, for .align output. */
913 int align_labels_log
;
915 int align_functions_log
;
917 /* Table of supported debugging formats. */
921 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
922 constant expression, we use NO_DEBUG in its place. */
923 enum debug_info_type debug_type
;
924 int use_extensions_p
;
925 const char *description
;
929 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
930 "Generate default debug format output" },
931 { "gdb", NO_DEBUG
, 1, "Generate default extended debug format output" },
932 #ifdef DBX_DEBUGGING_INFO
933 { "stabs", DBX_DEBUG
, 0, "Generate STABS format debug output" },
934 { "stabs+", DBX_DEBUG
, 1, "Generate extended STABS format debug output" },
936 #ifdef DWARF_DEBUGGING_INFO
937 { "dwarf", DWARF_DEBUG
, 0, "Generate DWARF-1 format debug output"},
938 { "dwarf+", DWARF_DEBUG
, 1,
939 "Generated extended DWARF-1 format debug output" },
941 #ifdef DWARF2_DEBUGGING_INFO
942 { "dwarf-2", DWARF2_DEBUG
, 0, "Enable DWARF-2 debug output" },
944 #ifdef XCOFF_DEBUGGING_INFO
945 { "xcoff", XCOFF_DEBUG
, 0, "Generate XCOFF format debug output" },
946 { "xcoff+", XCOFF_DEBUG
, 1, "Generate extended XCOFF format debug output" },
948 #ifdef SDB_DEBUGGING_INFO
949 { "coff", SDB_DEBUG
, 0, "Generate COFF format debug output" },
959 const char *description
;
961 lang_independent_options
;
965 /* Add or remove a leading underscore from user symbols. */
966 int flag_leading_underscore
= -1;
968 /* The user symbol prefix after having resolved same. */
969 const char *user_label_prefix
;
971 static const param_info lang_independent_params
[] = {
972 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
973 { OPTION, DEFAULT, HELP },
974 #include "params.def"
979 /* A default for same. */
980 #ifndef USER_LABEL_PREFIX
981 #define USER_LABEL_PREFIX ""
984 /* Table of language-independent -f options.
985 STRING is the option name. VARIABLE is the address of the variable.
986 ON_VALUE is the value to store in VARIABLE
987 if `-fSTRING' is seen as an option.
988 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
990 lang_independent_options f_options
[] =
992 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
993 "Perform DWARF2 duplicate elimination"},
994 {"float-store", &flag_float_store
, 1,
995 "Do not store floats in registers" },
996 {"volatile", &flag_volatile
, 1,
997 "Consider all mem refs through pointers as volatile"},
998 {"volatile-global", &flag_volatile_global
, 1,
999 "Consider all mem refs to global data to be volatile" },
1000 {"volatile-static", &flag_volatile_static
, 1,
1001 "Consider all mem refs to static data to be volatile" },
1002 {"defer-pop", &flag_defer_pop
, 1,
1003 "Defer popping functions args from stack until later" },
1004 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1005 "When possible do not generate stack frames"},
1006 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1007 "Optimize sibling and tail recursive calls" },
1008 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1009 "When running CSE, follow jumps to their targets" },
1010 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1011 "When running CSE, follow conditional jumps" },
1012 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1013 "Perform a number of minor, expensive optimisations" },
1014 {"thread-jumps", &flag_thread_jumps
, 1,
1015 "Perform jump threading optimisations"},
1016 {"strength-reduce", &flag_strength_reduce
, 1,
1017 "Perform strength reduction optimisations" },
1018 {"unroll-loops", &flag_unroll_loops
, 1,
1019 "Perform loop unrolling when iteration count is known" },
1020 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1021 "Perform loop unrolling for all loops" },
1022 {"move-all-movables", &flag_move_all_movables
, 1,
1023 "Force all loop invariant computations out of loops" },
1024 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1025 "Strength reduce all loop general induction variables" },
1026 {"writable-strings", &flag_writable_strings
, 1,
1027 "Store strings in writable data section" },
1028 {"peephole", &flag_no_peephole
, 0,
1029 "Enable machine specific peephole optimisations" },
1030 {"force-mem", &flag_force_mem
, 1,
1031 "Copy memory operands into registers before using" },
1032 {"force-addr", &flag_force_addr
, 1,
1033 "Copy memory address constants into regs before using" },
1034 {"function-cse", &flag_no_function_cse
, 0,
1035 "Allow function addresses to be held in registers" },
1036 {"inline-functions", &flag_inline_functions
, 1,
1037 "Integrate simple functions into their callers" },
1038 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1039 "Generate code for funcs even if they are fully inlined" },
1040 {"inline", &flag_no_inline
, 0,
1041 "Pay attention to the 'inline' keyword"},
1042 {"keep-static-consts", &flag_keep_static_consts
, 1,
1043 "Emit static const variables even if they are not used" },
1044 {"syntax-only", &flag_syntax_only
, 1,
1045 "Check for syntax errors, then stop" },
1046 {"shared-data", &flag_shared_data
, 1,
1047 "Mark data as shared rather than private" },
1048 {"caller-saves", &flag_caller_saves
, 1,
1049 "Enable saving registers around function calls" },
1050 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1051 "Return 'short' aggregates in memory, not registers" },
1052 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1053 "Return 'short' aggregates in registers" },
1054 {"delayed-branch", &flag_delayed_branch
, 1,
1055 "Attempt to fill delay slots of branch instructions" },
1056 {"gcse", &flag_gcse
, 1,
1057 "Perform the global common subexpression elimination" },
1058 {"gcse-lm", &flag_gcse_lm
, 1,
1059 "Perform enhanced load motion during global subexpression elimination" },
1060 {"gcse-sm", &flag_gcse_sm
, 1,
1061 "Perform store motion after global subexpression elimination" },
1062 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1063 "Run CSE pass after loop optimisations"},
1064 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1065 "Run the loop optimiser twice"},
1066 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1067 "Delete useless null pointer checks" },
1068 {"pretend-float", &flag_pretend_float
, 1,
1069 "Pretend that host and target use the same FP format"},
1070 {"schedule-insns", &flag_schedule_insns
, 1,
1071 "Reschedule instructions before register allocation"},
1072 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1073 "Reschedule instructions after register allocation"},
1074 {"sched-interblock",&flag_schedule_interblock
, 1,
1075 "Enable scheduling across basic blocks" },
1076 {"sched-spec",&flag_schedule_speculative
, 1,
1077 "Allow speculative motion of non-loads" },
1078 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1079 "Allow speculative motion of some loads" },
1080 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1081 "Allow speculative motion of more loads" },
1082 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1083 "Replace add,compare,branch with branch on count reg"},
1084 {"pic", &flag_pic
, 1,
1085 "Generate position independent code, if possible"},
1086 {"PIC", &flag_pic
, 2, ""},
1087 {"exceptions", &flag_exceptions
, 1,
1088 "Enable exception handling" },
1089 {"unwind-tables", &flag_unwind_tables
, 1,
1090 "Just generate unwind tables for exception handling" },
1091 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1092 "Support synchronous non-call exceptions" },
1093 {"profile-arcs", &profile_arc_flag
, 1,
1094 "Insert arc based program profiling code" },
1095 {"test-coverage", &flag_test_coverage
, 1,
1096 "Create data files needed by gcov" },
1097 {"branch-probabilities", &flag_branch_probabilities
, 1,
1098 "Use profiling information for branch probabilities" },
1099 {"reorder-blocks", &flag_reorder_blocks
, 1,
1100 "Reorder basic blocks to improve code placement" },
1101 {"rename-registers", &flag_rename_registers
, 1,
1102 "Do the register renaming optimization pass"},
1103 {"common", &flag_no_common
, 0,
1104 "Do not put unitialised globals in the common section" },
1105 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1106 "Do not generate .size directives" },
1107 {"function-sections", &flag_function_sections
, 1,
1108 "place each function into its own section" },
1109 {"data-sections", &flag_data_sections
, 1,
1110 "place data items into their own section" },
1111 {"verbose-asm", &flag_verbose_asm
, 1,
1112 "Add extra commentry to assembler output"},
1113 {"gnu-linker", &flag_gnu_linker
, 1,
1114 "Output GNU ld formatted global initialisers"},
1115 {"regmove", &flag_regmove
, 1,
1116 "Enables a register move optimisation"},
1117 {"optimize-register-move", &flag_regmove
, 1,
1118 "Do the full regmove optimization pass"},
1119 {"pack-struct", &flag_pack_struct
, 1,
1120 "Pack structure members together without holes" },
1121 {"stack-check", &flag_stack_check
, 1,
1122 "Insert stack checking code into the program" },
1123 {"argument-alias", &flag_argument_noalias
, 0,
1124 "Specify that arguments may alias each other & globals"},
1125 {"argument-noalias", &flag_argument_noalias
, 1,
1126 "Assume arguments may alias globals but not each other"},
1127 {"argument-noalias-global", &flag_argument_noalias
, 2,
1128 "Assume arguments do not alias each other or globals" },
1129 {"strict-aliasing", &flag_strict_aliasing
, 1,
1130 "Assume strict aliasing rules apply" },
1131 {"align-loops", &align_loops
, 0,
1132 "Align the start of loops" },
1133 {"align-jumps", &align_jumps
, 0,
1134 "Align labels which are only reached by jumping" },
1135 {"align-labels", &align_labels
, 0,
1136 "Align all labels" },
1137 {"align-functions", &align_functions
, 0,
1138 "Align the start of functions" },
1139 {"check-memory-usage", &flag_check_memory_usage
, 1,
1140 "Generate code to check every memory access" },
1141 {"prefix-function-name", &flag_prefix_function_name
, 1,
1142 "Add a prefix to all function names" },
1143 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1144 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1145 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1146 "Instrument function entry/exit with profiling calls"},
1147 {"ssa", &flag_ssa
, 1,
1148 "Enable SSA optimizations" },
1149 {"dce", &flag_dce
, 1,
1150 "Enable dead code elimination" },
1151 {"leading-underscore", &flag_leading_underscore
, 1,
1152 "External symbols have a leading underscore" },
1153 {"ident", &flag_no_ident
, 0,
1154 "Process #ident directives"},
1155 { "peephole2", &flag_peephole2
, 1,
1156 "Enables an rtl peephole pass run before sched2" },
1157 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1158 "Enables guessing of branch probabilities" },
1159 {"math-errno", &flag_errno_math
, 1,
1160 "Set errno after built-in math functions"},
1161 {"trapping-math", &flag_trapping_math
, 1,
1162 "Floating-point operations can trap"},
1163 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1164 "Allow math optimizations that may violate IEEE or ANSI standards"},
1165 {"bounded-pointers", &flag_bounded_pointers
, 1,
1166 "Compile pointers as triples: value, base & end" },
1167 {"bounds-check", &flag_bounds_check
, 1,
1168 "Generate code to check bounds before dereferencing pointers and arrays" },
1169 {"single-precision-constant", &flag_single_precision_constant
, 1,
1170 "Convert floating point constant to single precision constant"},
1171 {"time-report", &time_report
, 1,
1172 "Report time taken by each compiler pass at end of run"},
1173 {"mem-report", &mem_report
, 1,
1174 "Report on permanent memory allocation at end of run"},
1175 { "trapv", &flag_trapv
, 1,
1176 "Trap for signed overflow in addition / subtraction / multiplication." },
1179 /* Table of language-specific options. */
1181 static struct lang_opt
1184 const char *description
;
1186 documented_lang_options
[] =
1188 /* In order not to overload the --help output, the convention
1189 used here is to only describe those options which are not
1190 enabled by default. */
1192 { "-ansi", "Compile just for ISO C89" },
1193 { "-fallow-single-precision",
1194 "Do not promote floats to double if using -traditional" },
1195 { "-std= ", "Determine language standard"},
1197 { "-fsigned-bitfields", "" },
1198 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1199 { "-fno-signed-bitfields", "" },
1200 { "-fno-unsigned-bitfields","" },
1201 { "-fsigned-char", "Make 'char' be signed by default"},
1202 { "-funsigned-char", "Make 'char' be unsigned by default"},
1203 { "-fno-signed-char", "" },
1204 { "-fno-unsigned-char", "" },
1206 { "-ftraditional", "" },
1207 { "-traditional", "Attempt to support traditional K&R style C"},
1208 { "-fnotraditional", "" },
1209 { "-fno-traditional", "" },
1212 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1213 { "-fbuiltin", "" },
1214 { "-fno-builtin", "Do not recognise any built in functions" },
1215 { "-fhosted", "Assume normal C execution environment" },
1216 { "-fno-hosted", "" },
1218 "Assume that standard libraries & main might not exist" },
1219 { "-fno-freestanding", "" },
1220 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1221 { "-fno-cond-mismatch", "" },
1222 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1223 { "-fno-dollars-in-identifiers", "" },
1224 { "-fpreprocessed", "" },
1225 { "-fno-preprocessed", "" },
1226 { "-fshort-double", "Use the same size for double as for float" },
1227 { "-fno-short-double", "" },
1228 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1229 { "-fno-short-enums", "" },
1230 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1231 { "-fno-short-wchar", "" },
1233 { "-Wall", "Enable most warning messages" },
1234 { "-Wbad-function-cast",
1235 "Warn about casting functions to incompatible types" },
1236 { "-Wno-bad-function-cast", "" },
1237 { "-Wno-missing-noreturn", "" },
1238 { "-Wmissing-format-attribute",
1239 "Warn about functions which might be candidates for format attributes" },
1240 { "-Wno-missing-format-attribute", "" },
1241 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1242 { "-Wno-cast-qual", "" },
1243 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1244 { "-Wno-char-subscripts", "" },
1245 { "-Wcomment", "Warn if nested comments are detected" },
1246 { "-Wno-comment", "" },
1247 { "-Wcomments", "Warn if nested comments are detected" },
1248 { "-Wno-comments", "" },
1249 { "-Wconversion", "Warn about possibly confusing type conversions" },
1250 { "-Wno-conversion", "" },
1251 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1252 { "-Wno-format", "" },
1253 { "-Wformat-y2k", "" },
1254 { "-Wno-format-y2k",
1255 "Don't warn about strftime formats yielding 2 digit years" },
1256 { "-Wformat-extra-args", "" },
1257 { "-Wno-format-extra-args",
1258 "Don't warn about too many arguments to format functions" },
1259 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1260 { "-Wno-format-nonliteral", "" },
1261 { "-Wformat-security",
1262 "Warn about possible security problems with format functions" },
1263 { "-Wno-format-security", "" },
1264 { "-Wimplicit-function-declaration",
1265 "Warn about implicit function declarations" },
1266 { "-Wno-implicit-function-declaration", "" },
1267 { "-Werror-implicit-function-declaration", "" },
1268 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1269 { "-Wno-implicit-int", "" },
1270 { "-Wimplicit", "" },
1271 { "-Wno-implicit", "" },
1272 { "-Wimport", "Warn about the use of the #import directive" },
1273 { "-Wno-import", "" },
1274 { "-Wlong-long","" },
1275 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1276 { "-Wmain", "Warn about suspicious declarations of main" },
1277 { "-Wno-main", "" },
1278 { "-Wmissing-braces",
1279 "Warn about possibly missing braces around initialisers" },
1280 { "-Wno-missing-braces", "" },
1281 { "-Wmissing-declarations",
1282 "Warn about global funcs without previous declarations"},
1283 { "-Wno-missing-declarations", "" },
1284 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1285 { "-Wno-missing-prototypes", "" },
1286 { "-Wmultichar", "Warn about use of multicharacter literals"},
1287 { "-Wno-multichar", "" },
1288 { "-Wnested-externs", "Warn about externs not at file scope level" },
1289 { "-Wno-nested-externs", "" },
1290 { "-Wparentheses", "Warn about possible missing parentheses" },
1291 { "-Wno-parentheses", "" },
1292 { "-Wsequence-point",
1293 "Warn about possible violations of sequence point rules" },
1294 { "-Wno-sequence-point", "" },
1295 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1296 { "-Wno-pointer-arith", "" },
1297 { "-Wredundant-decls",
1298 "Warn about multiple declarations of the same object" },
1299 { "-Wno-redundant-decls", "" },
1300 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1301 { "-Wno-sign-compare", "" },
1302 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1303 { "-Wno-float-equal", "" },
1304 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1305 { "-Wno-unknown-pragmas", "" },
1306 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1307 { "-Wno-strict-prototypes", "" },
1308 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1309 { "-Wno-traditional", "" },
1310 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1311 { "-Wno-trigraphs", "" },
1313 { "-Wno-undef", "" },
1314 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1315 { "-Wno-write-strings", "" },
1317 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1319 #include "options.h"
1323 /* Here is a table, controlled by the tm.h file, listing each -m switch
1324 and which bits in `target_switches' it should set or clear.
1325 If VALUE is positive, it is bits to set.
1326 If VALUE is negative, -VALUE is bits to clear.
1327 (The sign bit is not used so there is no confusion.) */
1333 const char *description
;
1335 target_switches
[] = TARGET_SWITCHES
;
1337 /* This table is similar, but allows the switch to have a value. */
1339 #ifdef TARGET_OPTIONS
1343 const char **variable
;
1344 const char *description
;
1346 target_options
[] = TARGET_OPTIONS
;
1349 /* Options controlling warnings. */
1351 /* Don't print warning messages. -w. */
1353 int inhibit_warnings
= 0;
1355 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1357 int warn_system_headers
= 0;
1359 /* Print various extra warnings. -W. */
1361 int extra_warnings
= 0;
1363 /* Treat warnings as errors. -Werror. */
1365 int warnings_are_errors
= 0;
1367 /* Nonzero to warn about unused variables, functions et.al. */
1369 int warn_unused_function
;
1370 int warn_unused_label
;
1371 int warn_unused_parameter
;
1372 int warn_unused_variable
;
1373 int warn_unused_value
;
1376 set_Wunused (setting
)
1379 warn_unused_function
= setting
;
1380 warn_unused_label
= setting
;
1381 /* Unused function parameter warnings are reported when either ``-W
1382 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1383 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1385 warn_unused_parameter
= 0;
1386 else if (!warn_unused_parameter
)
1387 warn_unused_parameter
= -1;
1388 warn_unused_variable
= setting
;
1389 warn_unused_value
= setting
;
1392 /* Nonzero to warn about code which is never reached. */
1394 int warn_notreached
;
1396 /* Nonzero to warn about variables used before they are initialized. */
1398 int warn_uninitialized
;
1400 /* Nonzero means warn about all declarations which shadow others. */
1404 /* Warn if a switch on an enum fails to have a case for every enum value. */
1408 /* Nonzero means warn about function definitions that default the return type
1409 or that use a null return and have a return-type other than void. */
1411 int warn_return_type
;
1413 /* Nonzero means warn about pointer casts that increase the required
1414 alignment of the target type (and might therefore lead to a crash
1415 due to a misaligned access). */
1417 int warn_cast_align
;
1419 /* Nonzero means warn about any identifiers that match in the first N
1420 characters. The value N is in `id_clash_len'. */
1425 /* Nonzero means warn about any objects definitions whose size is larger
1426 than N bytes. Also want about function definitions whose returned
1427 values are larger than N bytes. The value N is in `larger_than_size'. */
1429 int warn_larger_than
;
1430 HOST_WIDE_INT larger_than_size
;
1432 /* Nonzero means warn if inline function is too large. */
1436 /* Warn if a function returns an aggregate,
1437 since there are often incompatible calling conventions for doing this. */
1439 int warn_aggregate_return
;
1441 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1445 /* Warn when gcc pads a structure to an alignment boundary. */
1449 /* Warn when an optimization pass is disabled. */
1451 int warn_disabled_optimization
;
1453 /* Warn about functions which might be candidates for attribute noreturn. */
1455 int warn_missing_noreturn
;
1457 /* Likewise for -W. */
1459 lang_independent_options W_options
[] =
1461 {"unused-function", &warn_unused_function
, 1, "Warn when a function is unused" },
1462 {"unused-label", &warn_unused_label
, 1, "Warn when a label is unused" },
1463 {"unused-parameter", &warn_unused_parameter
, 1, "Warn when a function parameter is unused" },
1464 {"unused-variable", &warn_unused_variable
, 1, "Warn when a variable is unused" },
1465 {"unused-value", &warn_unused_value
, 1, "Warn when an expression value is unused" },
1466 {"system-headers", &warn_system_headers
, 1, "Do not suppress warnings from system headers"},
1467 {"error", &warnings_are_errors
, 1, ""},
1468 {"shadow", &warn_shadow
, 1, "Warn when one local variable shadows another" },
1469 {"switch", &warn_switch
, 1,
1470 "Warn about enumerated switches missing a specific case" },
1471 {"aggregate-return", &warn_aggregate_return
, 1,
1472 "Warn about returning structures, unions or arrays" },
1473 {"cast-align", &warn_cast_align
, 1,
1474 "Warn about pointer casts which increase alignment" },
1475 {"unreachable-code", &warn_notreached
, 1,
1476 "Warn about code that will never be executed" },
1477 {"uninitialized", &warn_uninitialized
, 1,
1478 "Warn about unitialized automatic variables"},
1479 {"inline", &warn_inline
, 1,
1480 "Warn when an inlined function cannot be inlined"},
1481 {"packed", &warn_packed
, 1,
1482 "Warn when the packed attribute has no effect on struct layout"},
1483 {"padded", &warn_padded
, 1,
1484 "Warn when padding is required to align struct members"},
1485 {"disabled-optimization", &warn_disabled_optimization
, 1,
1486 "Warn when an optimization pass is disabled"},
1487 {"missing-noreturn", &warn_missing_noreturn
, 1,
1488 "Warn about functions which might be candidates for attribute noreturn"}
1491 /* The following routines are useful in setting all the flags that
1492 -ffast-math and -fno-fast-math imply. */
1495 set_fast_math_flags ()
1497 flag_trapping_math
= 0;
1498 flag_unsafe_math_optimizations
= 1;
1499 flag_errno_math
= 0;
1503 set_no_fast_math_flags ()
1505 flag_trapping_math
= 1;
1506 flag_unsafe_math_optimizations
= 0;
1507 flag_errno_math
= 1;
1511 /* Output files for assembler code (real compiler output)
1512 and debugging dumps. */
1515 FILE *aux_info_file
;
1516 FILE *rtl_dump_file
= NULL
;
1518 /* Decode the string P as an integral parameter.
1519 If the string is indeed an integer return its numeric value else
1520 issue an Invalid Option error for the option PNAME and return DEFVAL.
1521 If PNAME is zero just return DEFVAL, do not call error. */
1524 read_integral_parameter (p
, pname
, defval
)
1529 const char *endp
= p
;
1533 if (*endp
>= '0' && *endp
<= '9')
1542 error ("Invalid option `%s'", pname
);
1550 /* This is the default decl_printable_name function. */
1553 decl_name (decl
, verbosity
)
1555 int verbosity ATTRIBUTE_UNUSED
;
1557 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1561 /* This calls abort and is used to avoid problems when abort if a macro.
1562 It is used when we need to pass the address of abort. */
1570 /* When `malloc.c' is compiled with `rcheck' defined,
1571 it calls this function to report clobberage. */
1575 const char *s ATTRIBUTE_UNUSED
;
1580 /* Return the logarithm of X, base 2, considering X unsigned,
1581 if X is a power of 2. Otherwise, returns -1.
1583 This should be used via the `exact_log2' macro. */
1587 register unsigned HOST_WIDE_INT x
;
1589 register int log
= 0;
1590 /* Test for 0 or a power of 2. */
1591 if (x
== 0 || x
!= (x
& -x
))
1593 while ((x
>>= 1) != 0)
1598 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1599 If X is 0, return -1.
1601 This should be used via the floor_log2 macro. */
1605 register unsigned HOST_WIDE_INT x
;
1607 register int log
= -1;
1614 /* Return the approximate positive square root of a number N. This is for
1615 statistical reports, not code generation. */
1630 d
= (s
* s
- x
) / (2 * s
);
1637 static int float_handler_set
;
1639 jmp_buf float_handler
;
1641 /* Signals actually come here. */
1644 float_signal (signo
)
1645 /* If this is missing, some compilers complain. */
1646 int signo ATTRIBUTE_UNUSED
;
1648 if (float_handled
== 0)
1649 crash_signal (signo
);
1652 /* On System-V derived systems, we must reinstall the signal handler.
1653 This is harmless on BSD-derived systems. */
1654 signal (SIGFPE
, float_signal
);
1655 longjmp (float_handler
, 1);
1658 /* Specify where to longjmp to when a floating arithmetic error happens.
1659 If HANDLER is 0, it means don't handle the errors any more. */
1662 set_float_handler (handler
)
1665 float_handled
= (handler
!= 0);
1667 memcpy (float_handler
, handler
, sizeof (float_handler
));
1669 if (float_handled
&& ! float_handler_set
)
1671 signal (SIGFPE
, float_signal
);
1672 float_handler_set
= 1;
1676 /* This is a wrapper function for code which might elicit an
1677 arithmetic exception. That code should be passed in as a function
1678 pointer FN, and one argument DATA. DATA is usually a struct which
1679 contains the real input and output for function FN. This function
1680 returns 0 (failure) if longjmp was called (i.e. an exception
1681 occured.) It returns 1 (success) otherwise. */
1684 do_float_handler (fn
, data
)
1685 void (*fn
) PARAMS ((PTR
));
1692 /* We got here via longjmp () caused by an exception in function
1694 set_float_handler (NULL
);
1698 set_float_handler (buf
);
1700 set_float_handler (NULL
);
1704 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1705 into ICE messages, which is much more user friendly. */
1708 crash_signal (signo
)
1711 internal_error ("Internal error: %s", strsignal (signo
));
1714 /* Strip off a legitimate source ending from the input string NAME of
1715 length LEN. Rather than having to know the names used by all of
1716 our front ends, we strip off an ending of a period followed by
1717 up to five characters. (Java uses ".class".) */
1720 strip_off_ending (name
, len
)
1725 for (i
= 2; i
< 6 && len
> i
; i
++)
1727 if (name
[len
- i
] == '.')
1729 name
[len
- i
] = '\0';
1735 /* Output a quoted string. */
1738 output_quoted_string (asm_file
, string
)
1742 #ifdef OUTPUT_QUOTED_STRING
1743 OUTPUT_QUOTED_STRING (asm_file
, string
);
1747 putc ('\"', asm_file
);
1748 while ((c
= *string
++) != 0)
1750 if (c
== '\"' || c
== '\\')
1751 putc ('\\', asm_file
);
1754 putc ('\"', asm_file
);
1758 /* Output a file name in the form wanted by System V. */
1761 output_file_directive (asm_file
, input_name
)
1763 const char *input_name
;
1765 int len
= strlen (input_name
);
1766 const char *na
= input_name
+ len
;
1768 /* NA gets INPUT_NAME sans directory names. */
1769 while (na
> input_name
)
1771 if (IS_DIR_SEPARATOR (na
[-1]))
1776 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1777 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1779 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1780 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1782 fprintf (asm_file
, "\t.file\t");
1783 output_quoted_string (asm_file
, na
);
1784 fputc ('\n', asm_file
);
1789 /* Routine to open a dump file. Return true if the dump file is enabled. */
1792 open_dump_file (index
, decl
)
1793 enum dump_file_index index
;
1797 const char *open_arg
;
1800 if (! dump_file
[index
].enabled
)
1803 timevar_push (TV_DUMP
);
1804 if (rtl_dump_file
!= NULL
)
1805 fclose (rtl_dump_file
);
1807 sprintf (seq
, ".%02d.", index
);
1809 if (! dump_file
[index
].initialized
)
1811 /* If we've not initialized the files, do so now. */
1812 if (graph_dump_format
!= no_graph
1813 && dump_file
[index
].graph_dump_p
)
1815 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1816 clean_graph_dump_file (dump_base_name
, dump_name
);
1819 dump_file
[index
].initialized
= 1;
1825 dump_name
= concat (dump_base_name
, seq
,
1826 dump_file
[index
].extension
, NULL
);
1828 rtl_dump_file
= fopen (dump_name
, open_arg
);
1829 if (rtl_dump_file
== NULL
)
1830 fatal_io_error ("can't open %s", dump_name
);
1835 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1836 decl_printable_name (decl
, 2));
1838 timevar_pop (TV_DUMP
);
1842 /* Routine to close a dump file. */
1845 close_dump_file (index
, func
, insns
)
1846 enum dump_file_index index
;
1847 void (*func
) PARAMS ((FILE *, rtx
));
1850 if (! rtl_dump_file
)
1853 timevar_push (TV_DUMP
);
1855 && graph_dump_format
!= no_graph
1856 && dump_file
[index
].graph_dump_p
)
1861 sprintf (seq
, ".%02d.", index
);
1862 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1863 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1868 func (rtl_dump_file
, insns
);
1870 fflush (rtl_dump_file
);
1871 fclose (rtl_dump_file
);
1873 rtl_dump_file
= NULL
;
1874 timevar_pop (TV_DUMP
);
1877 /* Do any final processing required for the declarations in VEC, of
1878 which there are LEN. We write out inline functions and variables
1879 that have been deferred until this point, but which are required.
1880 Returns non-zero if anything was put out. */
1883 wrapup_global_declarations (vec
, len
)
1890 int output_something
= 0;
1892 for (i
= 0; i
< len
; i
++)
1896 /* We're not deferring this any longer. */
1897 DECL_DEFER_OUTPUT (decl
) = 0;
1899 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1900 && incomplete_decl_finalize_hook
!= 0)
1901 (*incomplete_decl_finalize_hook
) (decl
);
1904 /* Now emit any global variables or functions that we have been
1905 putting off. We need to loop in case one of the things emitted
1906 here references another one which comes earlier in the list. */
1910 for (i
= 0; i
< len
; i
++)
1914 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1917 /* Don't write out static consts, unless we still need them.
1919 We also keep static consts if not optimizing (for debugging),
1920 unless the user specified -fno-keep-static-consts.
1921 ??? They might be better written into the debug information.
1922 This is possible when using DWARF.
1924 A language processor that wants static constants to be always
1925 written out (even if it is not used) is responsible for
1926 calling rest_of_decl_compilation itself. E.g. the C front-end
1927 calls rest_of_decl_compilation from finish_decl.
1928 One motivation for this is that is conventional in some
1929 environments to write things like:
1930 static const char rcsid[] = "... version string ...";
1931 intending to force the string to be in the executable.
1933 A language processor that would prefer to have unneeded
1934 static constants "optimized away" would just defer writing
1935 them out until here. E.g. C++ does this, because static
1936 constants are often defined in header files.
1938 ??? A tempting alternative (for both C and C++) would be
1939 to force a constant to be written if and only if it is
1940 defined in a main file, as opposed to an include file. */
1942 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1943 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1944 && !DECL_COMDAT (decl
))
1946 && flag_keep_static_consts
1947 && !DECL_ARTIFICIAL (decl
))
1948 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1951 rest_of_decl_compilation (decl
, NULL_PTR
, 1, 1);
1954 if (TREE_CODE (decl
) == FUNCTION_DECL
1955 && DECL_INITIAL (decl
) != 0
1956 && DECL_SAVED_INSNS (decl
) != 0
1957 && (flag_keep_inline_functions
1958 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1959 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1962 output_inline_function (decl
);
1967 output_something
= 1;
1971 return output_something
;
1974 /* Issue appropriate warnings for the global declarations in VEC (of
1975 which there are LEN). Output debugging information for them. */
1978 check_global_declarations (vec
, len
)
1985 for (i
= 0; i
< len
; i
++)
1989 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1990 && ! TREE_ASM_WRITTEN (decl
))
1991 /* Cancel the RTL for this decl so that, if debugging info
1992 output for global variables is still to come,
1993 this one will be omitted. */
1994 SET_DECL_RTL (decl
, NULL_RTX
);
1996 /* Warn about any function
1997 declared static but not defined.
1998 We don't warn about variables,
1999 because many programs have static variables
2000 that exist only to get some text into the object file. */
2001 if (TREE_CODE (decl
) == FUNCTION_DECL
2002 && (warn_unused_function
2003 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2004 && DECL_INITIAL (decl
) == 0
2005 && DECL_EXTERNAL (decl
)
2006 && ! DECL_ARTIFICIAL (decl
)
2007 && ! TREE_PUBLIC (decl
))
2009 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2010 pedwarn_with_decl (decl
,
2011 "`%s' used but never defined");
2013 warning_with_decl (decl
,
2014 "`%s' declared `static' but never defined");
2015 /* This symbol is effectively an "extern" declaration now. */
2016 TREE_PUBLIC (decl
) = 1;
2017 assemble_external (decl
);
2020 /* Warn about static fns or vars defined but not used,
2021 but not about inline functions or static consts
2022 since defining those in header files is normal practice. */
2023 if (((warn_unused_function
2024 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2025 || (warn_unused_variable
2026 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2027 && ! DECL_IN_SYSTEM_HEADER (decl
)
2028 && ! DECL_EXTERNAL (decl
)
2029 && ! TREE_PUBLIC (decl
)
2030 && ! TREE_USED (decl
)
2031 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2032 /* The TREE_USED bit for file-scope decls
2033 is kept in the identifier, to handle multiple
2034 external decls in different scopes. */
2035 && ! TREE_USED (DECL_NAME (decl
)))
2036 warning_with_decl (decl
, "`%s' defined but not used");
2038 timevar_push (TV_SYMOUT
);
2039 #ifdef SDB_DEBUGGING_INFO
2040 /* The COFF linker can move initialized global vars to the end.
2041 And that can screw up the symbol ordering.
2042 By putting the symbols in that order to begin with,
2043 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2044 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2045 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2046 && ! DECL_EXTERNAL (decl
)
2047 && DECL_RTL (decl
) != 0)
2048 sdbout_symbol (decl
, 0);
2050 /* Output COFF information for non-global
2051 file-scope initialized variables. */
2052 if (write_symbols
== SDB_DEBUG
2053 && TREE_CODE (decl
) == VAR_DECL
2054 && DECL_INITIAL (decl
)
2055 && ! DECL_EXTERNAL (decl
)
2056 && DECL_RTL (decl
) != 0
2057 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2058 sdbout_toplevel_data (decl
);
2059 #endif /* SDB_DEBUGGING_INFO */
2060 #ifdef DWARF_DEBUGGING_INFO
2061 /* Output DWARF information for file-scope tentative data object
2062 declarations, file-scope (extern) function declarations (which
2063 had no corresponding body) and file-scope tagged type declarations
2064 and definitions which have not yet been forced out. */
2066 if (write_symbols
== DWARF_DEBUG
2067 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2068 dwarfout_file_scope_decl (decl
, 1);
2070 #ifdef DWARF2_DEBUGGING_INFO
2071 /* Output DWARF2 information for file-scope tentative data object
2072 declarations, file-scope (extern) function declarations (which
2073 had no corresponding body) and file-scope tagged type declarations
2074 and definitions which have not yet been forced out. */
2076 if (write_symbols
== DWARF2_DEBUG
2077 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2078 dwarf2out_decl (decl
);
2080 timevar_pop (TV_SYMOUT
);
2084 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2085 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2086 INPUT_FILENAME and LINENO accordingly. */
2089 push_srcloc (file
, line
)
2093 struct file_stack
*fs
;
2095 if (input_file_stack
)
2097 input_file_stack
->name
= input_filename
;
2098 input_file_stack
->line
= lineno
;
2101 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2102 fs
->name
= input_filename
= file
;
2103 fs
->line
= lineno
= line
;
2104 fs
->indent_level
= 0;
2105 fs
->next
= input_file_stack
;
2106 input_file_stack
= fs
;
2107 input_file_stack_tick
++;
2110 /* Pop the top entry off the stack of presently open source files.
2111 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2117 struct file_stack
*fs
;
2119 fs
= input_file_stack
;
2120 input_file_stack
= fs
->next
;
2122 input_file_stack_tick
++;
2123 /* The initial source file is never popped. */
2124 if (!input_file_stack
)
2126 input_filename
= input_file_stack
->name
;
2127 lineno
= input_file_stack
->line
;
2130 /* Compile an entire file of output from cpp, named NAME.
2131 Write a file of assembly output and various debugging dumps. */
2139 int name_specified
= name
!= 0;
2141 if (dump_base_name
== 0)
2142 dump_base_name
= name
? name
: "gccdump";
2147 /* Start timing total execution time. */
2150 timevar_start (TV_TOTAL
);
2152 /* Initialize data in various passes. */
2155 name
= init_parse (name
);
2156 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2157 || debug_info_level
== DINFO_LEVEL_VERBOSE
2158 || flag_test_coverage
2159 || warn_notreached
);
2162 init_decl_processing ();
2168 init_function_once ();
2169 init_stor_layout_once ();
2170 init_varasm_once ();
2171 init_EXPR_INSN_LIST_cache ();
2173 /* The following initialization functions need to generate rtl, so
2174 provide a dummy function context for them. */
2175 init_dummy_function_start ();
2178 if (flag_caller_saves
)
2179 init_caller_save ();
2180 expand_dummy_function_end ();
2182 /* If auxiliary info generation is desired, open the output file.
2183 This goes in the same directory as the source file--unlike
2184 all the other output files. */
2185 if (flag_gen_aux_info
)
2187 aux_info_file
= fopen (aux_info_file_name
, "w");
2188 if (aux_info_file
== 0)
2189 fatal_io_error ("can't open %s", aux_info_file_name
);
2192 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2193 because then the driver will have provided the name of a temporary
2194 file or bit bucket for us. */
2196 if (! name_specified
&& asm_file_name
== 0)
2197 asm_out_file
= stdout
;
2200 if (asm_file_name
== 0)
2202 int len
= strlen (dump_base_name
);
2203 char *dumpname
= (char *) xmalloc (len
+ 6);
2204 memcpy (dumpname
, dump_base_name
, len
+ 1);
2205 strip_off_ending (dumpname
, len
);
2206 strcat (dumpname
, ".s");
2207 asm_file_name
= dumpname
;
2209 if (!strcmp (asm_file_name
, "-"))
2210 asm_out_file
= stdout
;
2212 asm_out_file
= fopen (asm_file_name
, "w");
2213 if (asm_out_file
== 0)
2214 fatal_io_error ("can't open %s for writing", asm_file_name
);
2217 #ifdef IO_BUFFER_SIZE
2218 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2219 _IOFBF
, IO_BUFFER_SIZE
);
2223 name
= ggc_strdup (name
);
2225 input_filename
= name
;
2227 /* Put an entry on the input file stack for the main input file. */
2228 push_srcloc (input_filename
, 0);
2230 /* Perform language-specific initialization.
2231 This may set main_input_filename. */
2232 if (lang_hooks
.init
)
2233 (*lang_hooks
.init
) ();
2235 /* If the input doesn't start with a #line, use the input name
2236 as the official input file name. */
2237 if (main_input_filename
== 0)
2238 main_input_filename
= name
;
2240 if (flag_syntax_only
)
2242 write_symbols
= NO_DEBUG
;
2244 profile_block_flag
= 0;
2248 ASM_FILE_START (asm_out_file
);
2250 #ifdef ASM_COMMENT_START
2251 if (flag_verbose_asm
)
2253 /* Print the list of options in effect. */
2254 print_version (asm_out_file
, ASM_COMMENT_START
);
2255 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2256 ASM_COMMENT_START
, " ", "\n");
2257 /* Add a blank line here so it appears in assembler output but not
2259 fprintf (asm_out_file
, "\n");
2262 } /* ! flag_syntax_only */
2264 #ifndef ASM_OUTPUT_SECTION_NAME
2265 if (flag_function_sections
)
2267 warning ("-ffunction-sections not supported for this target.");
2268 flag_function_sections
= 0;
2270 if (flag_data_sections
)
2272 warning ("-fdata-sections not supported for this target.");
2273 flag_data_sections
= 0;
2277 if (flag_function_sections
2278 && (profile_flag
|| profile_block_flag
))
2280 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2281 flag_function_sections
= 0;
2284 #ifndef OBJECT_FORMAT_ELF
2285 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2286 warning ("-ffunction-sections may affect debugging on some targets.");
2289 /* If dbx symbol table desired, initialize writing it
2290 and output the predefined types. */
2291 timevar_push (TV_SYMOUT
);
2292 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2293 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2294 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2296 #ifdef SDB_DEBUGGING_INFO
2297 if (write_symbols
== SDB_DEBUG
)
2298 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2300 #ifdef DWARF_DEBUGGING_INFO
2301 if (write_symbols
== DWARF_DEBUG
)
2302 dwarfout_init (asm_out_file
, main_input_filename
);
2304 #ifdef DWARF2_UNWIND_INFO
2305 if (dwarf2out_do_frame ())
2306 dwarf2out_frame_init ();
2308 #ifdef DWARF2_DEBUGGING_INFO
2309 if (write_symbols
== DWARF2_DEBUG
)
2310 dwarf2out_init (asm_out_file
, main_input_filename
);
2312 timevar_pop (TV_SYMOUT
);
2314 /* Initialize yet another pass. */
2316 init_final (main_input_filename
);
2317 init_branch_prob (dump_base_name
);
2319 timevar_push (TV_PARSE
);
2321 /* Call the parser, which parses the entire file
2322 (calling rest_of_compilation for each function). */
2324 if (yyparse () != 0)
2326 if (errorcount
== 0)
2327 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2329 /* In case there were missing closebraces,
2330 get us back to the global binding level. */
2331 while (! global_bindings_p ())
2335 /* Compilation is now finished except for writing
2336 what's left of the symbol table output. */
2338 timevar_pop (TV_PARSE
);
2340 if (flag_syntax_only
)
2343 globals
= getdecls ();
2345 /* Really define vars that have had only a tentative definition.
2346 Really output inline functions that must actually be callable
2347 and have not been output so far. */
2350 int len
= list_length (globals
);
2351 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2355 /* Process the decls in reverse order--earliest first.
2356 Put them into VEC from back to front, then take out from front. */
2358 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2359 vec
[len
- i
- 1] = decl
;
2361 wrapup_global_declarations (vec
, len
);
2363 /* This must occur after the loop to output deferred functions. Else
2364 the profiler initializer would not be emitted if all the functions
2365 in this compilation unit were deferred.
2367 output_func_start_profiler can not cause any additional functions or
2368 data to need to be output, so it need not be in the deferred function
2370 output_func_start_profiler ();
2372 check_global_declarations (vec
, len
);
2378 /* Write out any pending weak symbol declarations. */
2382 /* Do dbx symbols. */
2383 timevar_push (TV_SYMOUT
);
2384 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2385 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2386 dbxout_finish (asm_out_file
, main_input_filename
);
2389 #ifdef DWARF_DEBUGGING_INFO
2390 if (write_symbols
== DWARF_DEBUG
)
2394 #ifdef DWARF2_UNWIND_INFO
2395 if (dwarf2out_do_frame ())
2396 dwarf2out_frame_finish ();
2399 #ifdef DWARF2_DEBUGGING_INFO
2400 if (write_symbols
== DWARF2_DEBUG
)
2401 dwarf2out_finish ();
2403 timevar_pop (TV_SYMOUT
);
2405 /* Output some stuff at end of file if nec. */
2407 end_final (dump_base_name
);
2409 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2411 timevar_push (TV_DUMP
);
2412 open_dump_file (DFI_bp
, NULL
);
2416 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2417 timevar_pop (TV_DUMP
);
2421 ASM_FILE_END (asm_out_file
);
2424 /* Attach a special .ident directive to the end of the file to identify
2425 the version of GCC which compiled this code. The format of the .ident
2426 string is patterned after the ones produced by native SVR4 compilers. */
2429 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2430 IDENT_ASM_OP
, version_string
);
2433 /* Language-specific end of compilation actions. */
2435 if (lang_hooks
.finish
)
2436 (*lang_hooks
.finish
) ();
2438 /* Close the dump files. */
2440 if (flag_gen_aux_info
)
2442 fclose (aux_info_file
);
2444 unlink (aux_info_file_name
);
2447 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2449 timevar_push (TV_DUMP
);
2450 dump_combine_total_stats (rtl_dump_file
);
2451 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2452 timevar_pop (TV_DUMP
);
2455 /* Close non-debugging input and output files. Take special care to note
2456 whether fclose returns an error, since the pages might still be on the
2457 buffer chain while the file is open. */
2461 if (ferror (asm_out_file
) != 0)
2462 fatal_io_error ("error writing to %s", asm_file_name
);
2463 if (fclose (asm_out_file
) != 0)
2464 fatal_io_error ("error closing %s", asm_file_name
);
2466 /* Do whatever is necessary to finish printing the graphs. */
2467 if (graph_dump_format
!= no_graph
)
2471 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2472 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2477 sprintf (seq
, ".%02d.", i
);
2478 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2479 finish_graph_dump_file (dump_base_name
, suffix
);
2486 ggc_print_statistics ();
2487 stringpool_statistics ();
2490 /* Free up memory for the benefit of leak detectors. */
2493 /* Stop timing total execution time. */
2494 timevar_stop (TV_TOTAL
);
2496 /* Print the times. */
2498 timevar_print (stderr
);
2501 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2502 and TYPE_DECL nodes.
2504 This does nothing for local (non-static) variables, unless the
2505 variable is a register variable with an ASMSPEC. In that case, or
2506 if the variable is not an automatice, it sets up the RTL and
2507 outputs any assembler code (label definition, storage allocation
2508 and initialization).
2510 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2511 the assembler symbol name to be used. TOP_LEVEL is nonzero
2512 if this declaration is not within a function. */
2515 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2517 const char *asmspec
;
2521 /* Declarations of variables, and of functions defined elsewhere. */
2523 /* The most obvious approach, to put an #ifndef around where
2524 this macro is used, doesn't work since it's inside a macro call. */
2525 #ifndef ASM_FINISH_DECLARE_OBJECT
2526 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2529 /* Forward declarations for nested functions are not "external",
2530 but we need to treat them as if they were. */
2531 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2532 || TREE_CODE (decl
) == FUNCTION_DECL
)
2534 timevar_push (TV_VARCONST
);
2536 make_decl_rtl (decl
, asmspec
);
2537 /* Don't output anything
2538 when a tentative file-scope definition is seen.
2539 But at end of compilation, do output code for them. */
2540 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2541 assemble_variable (decl
, top_level
, at_end
, 0);
2542 if (decl
== last_assemble_variable_decl
)
2544 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2547 timevar_pop (TV_VARCONST
);
2549 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2551 if (decode_reg_name (asmspec
) >= 0)
2553 SET_DECL_RTL (decl
, NULL_RTX
);
2554 make_decl_rtl (decl
, asmspec
);
2558 error ("invalid register name `%s' for register variable", asmspec
);
2559 DECL_REGISTER (decl
) = 0;
2564 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2565 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2566 && TREE_CODE (decl
) == TYPE_DECL
)
2568 timevar_push (TV_SYMOUT
);
2569 dbxout_symbol (decl
, 0);
2570 timevar_pop (TV_SYMOUT
);
2573 #ifdef SDB_DEBUGGING_INFO
2574 else if (write_symbols
== SDB_DEBUG
&& top_level
2575 && TREE_CODE (decl
) == TYPE_DECL
)
2577 timevar_push (TV_SYMOUT
);
2578 sdbout_symbol (decl
, 0);
2579 timevar_pop (TV_SYMOUT
);
2584 /* Called after finishing a record, union or enumeral type. */
2587 rest_of_type_compilation (type
, toplev
)
2588 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2592 tree type ATTRIBUTE_UNUSED
;
2593 int toplev ATTRIBUTE_UNUSED
;
2596 timevar_push (TV_SYMOUT
);
2597 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2598 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2599 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2601 #ifdef SDB_DEBUGGING_INFO
2602 if (write_symbols
== SDB_DEBUG
)
2603 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2605 #ifdef DWARF2_DEBUGGING_INFO
2606 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2607 dwarf2out_decl (TYPE_STUB_DECL (type
));
2609 timevar_pop (TV_SYMOUT
);
2612 /* DECL is an inline function, whose body is present, but which is not
2613 being output at this point. (We're putting that off until we need
2614 to do it.) If there are any actions that need to take place,
2615 including the emission of debugging information for the function,
2616 this is where they should go. This function may be called by
2617 language-dependent code for front-ends that do not even generate
2618 RTL for functions that don't need to be put out. */
2621 note_deferral_of_defined_inline_function (decl
)
2622 tree decl ATTRIBUTE_UNUSED
;
2624 #ifdef DWARF_DEBUGGING_INFO
2625 /* Generate the DWARF info for the "abstract" instance of a function
2626 which we may later generate inlined and/or out-of-line instances
2628 if (write_symbols
== DWARF_DEBUG
2629 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2630 && ! DECL_ABSTRACT_ORIGIN (decl
))
2632 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2633 DWARF code expects it to be set in this case. Intuitively,
2634 DECL is the function we just finished defining, so setting
2635 CURRENT_FUNCTION_DECL is sensible. */
2636 tree saved_cfd
= current_function_decl
;
2637 int was_abstract
= DECL_ABSTRACT (decl
);
2638 current_function_decl
= decl
;
2640 /* Let the DWARF code do its work. */
2641 set_decl_abstract_flags (decl
, 1);
2642 dwarfout_file_scope_decl (decl
, 0);
2644 set_decl_abstract_flags (decl
, 0);
2646 /* Reset CURRENT_FUNCTION_DECL. */
2647 current_function_decl
= saved_cfd
;
2652 /* FNDECL is an inline function which is about to be emitted out of line.
2653 Do any preparation, such as emitting abstract debug info for the inline
2654 before it gets mangled by optimization. */
2657 note_outlining_of_inline_function (fndecl
)
2658 tree fndecl ATTRIBUTE_UNUSED
;
2660 #ifdef DWARF2_DEBUGGING_INFO
2661 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2662 the abstract description of inline functions until something tries to
2663 reference them. Force it out now, before optimizations mangle the
2665 if (write_symbols
== DWARF2_DEBUG
)
2666 dwarf2out_abstract_function (fndecl
);
2670 /* This is called from finish_function (within yyparse)
2671 after each top-level definition is parsed.
2672 It is supposed to compile that function or variable
2673 and output the assembler code for it.
2674 After we return, the tree storage is freed. */
2677 rest_of_compilation (decl
)
2683 int rebuild_label_notes_after_reload
;
2684 int register_life_up_to_date
;
2686 timevar_push (TV_REST_OF_COMPILATION
);
2688 /* Now that we're out of the frontend, we shouldn't have any more
2689 CONCATs anywhere. */
2690 generating_concat_p
= 0;
2692 /* When processing delayed functions, prepare_function_start() won't
2693 have been run to re-initialize it. */
2694 cse_not_expected
= ! optimize
;
2696 /* First, make sure that NOTE_BLOCK is set correctly for each
2697 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2698 if (!cfun
->x_whole_function_mode_p
)
2701 /* Then remove any notes we don't need. That will make iterating
2702 over the instruction sequence faster, and allow the garbage
2703 collector to reclaim the memory used by the notes. */
2704 remove_unnecessary_notes ();
2706 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2707 tree in sensible shape. So, we just recalculate it here. */
2708 if (cfun
->x_whole_function_mode_p
)
2713 /* If we are reconsidering an inline function
2714 at the end of compilation, skip the stuff for making it inline. */
2716 if (DECL_SAVED_INSNS (decl
) == 0)
2722 /* If this is nested inside an inlined external function, pretend
2723 it was only declared. Since we cannot inline such functions,
2724 generating code for this one is not only not necessary but will
2725 confuse some debugging output writers. */
2726 for (parent
= DECL_CONTEXT (current_function_decl
);
2727 parent
!= NULL_TREE
;
2728 parent
= get_containing_scope (parent
))
2729 if (TREE_CODE (parent
) == FUNCTION_DECL
2730 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2732 DECL_INITIAL (decl
) = 0;
2733 goto exit_rest_of_compilation
;
2736 /* If requested, consider whether to make this function inline. */
2737 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2738 || flag_inline_functions
)
2740 timevar_push (TV_INTEGRATION
);
2741 lose
= function_cannot_inline_p (decl
);
2742 timevar_pop (TV_INTEGRATION
);
2743 if (lose
|| ! optimize
)
2745 if (warn_inline
&& DECL_INLINE (decl
))
2746 warning_with_decl (decl
, lose
);
2747 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2748 /* Don't really compile an extern inline function.
2749 If we can't make it inline, pretend
2750 it was only declared. */
2751 if (DECL_EXTERNAL (decl
))
2753 DECL_INITIAL (decl
) = 0;
2754 goto exit_rest_of_compilation
;
2758 /* ??? Note that this has the effect of making it look
2759 like "inline" was specified for a function if we choose
2760 to inline it. This isn't quite right, but it's
2761 probably not worth the trouble to fix. */
2762 inlinable
= DECL_INLINE (decl
) = 1;
2765 insns
= get_insns ();
2767 /* Dump the rtl code if we are dumping rtl. */
2769 if (open_dump_file (DFI_rtl
, decl
))
2771 if (DECL_SAVED_INSNS (decl
))
2772 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2773 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2776 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2777 sorts of eh initialization. Delay this until after the
2778 initial rtl dump so that we can see the original nesting. */
2779 convert_from_eh_region_ranges ();
2781 /* If function is inline, and we don't yet know whether to
2782 compile it by itself, defer decision till end of compilation.
2783 finish_compilation will call rest_of_compilation again
2784 for those functions that need to be output. Also defer those
2785 functions that we are supposed to defer. */
2788 || (DECL_INLINE (decl
)
2789 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2790 && ! flag_keep_inline_functions
)
2791 || DECL_EXTERNAL (decl
))))
2792 DECL_DEFER_OUTPUT (decl
) = 1;
2794 if (DECL_INLINE (decl
))
2795 /* DWARF wants seperate debugging info for abstract and
2796 concrete instances of all inline functions, including those
2797 declared inline but not inlined, and those inlined even
2798 though they weren't declared inline. Conveniently, that's
2799 what DECL_INLINE means at this point. */
2800 note_deferral_of_defined_inline_function (decl
);
2802 if (DECL_DEFER_OUTPUT (decl
))
2804 /* If -Wreturn-type, we have to do a bit of compilation. We just
2805 want to call jump_optimize to figure out whether or not we can
2806 fall off the end of the function; we do the minimum amount of
2807 work necessary to make that safe. And, we set optimize to zero
2808 to keep jump_optimize from working too hard. */
2809 if (warn_return_type
)
2811 int saved_optimize
= optimize
;
2814 find_exception_handler_labels ();
2815 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2816 !JUMP_AFTER_REGSCAN
);
2817 optimize
= saved_optimize
;
2820 current_function_nothrow
= nothrow_function_p ();
2821 if (current_function_nothrow
)
2822 /* Now we know that this can't throw; set the flag for the benefit
2823 of other functions later in this translation unit. */
2824 TREE_NOTHROW (current_function_decl
) = 1;
2826 timevar_push (TV_INTEGRATION
);
2827 save_for_inline (decl
);
2828 timevar_pop (TV_INTEGRATION
);
2829 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2830 goto exit_rest_of_compilation
;
2833 /* If specified extern inline but we aren't inlining it, we are
2834 done. This goes for anything that gets here with DECL_EXTERNAL
2835 set, not just things with DECL_INLINE. */
2836 if (DECL_EXTERNAL (decl
))
2837 goto exit_rest_of_compilation
;
2842 /* Initialize some variables used by the optimizers. */
2843 init_function_for_compilation ();
2845 if (! DECL_DEFER_OUTPUT (decl
))
2846 TREE_ASM_WRITTEN (decl
) = 1;
2848 /* Now that integrate will no longer see our rtl, we need not
2849 distinguish between the return value of this function and the
2850 return value of called functions. Also, we can remove all SETs
2851 of subregs of hard registers; they are only here because of
2853 rtx_equal_function_value_matters
= 0;
2854 purge_hard_subreg_sets (get_insns ());
2856 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2857 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2858 goto exit_rest_of_compilation
;
2860 /* We may have potential sibling or tail recursion sites. Select one
2861 (of possibly multiple) methods of performing the call. */
2862 if (flag_optimize_sibling_calls
)
2864 timevar_push (TV_JUMP
);
2865 open_dump_file (DFI_sibling
, decl
);
2867 optimize_sibling_and_tail_recursive_calls ();
2869 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2870 timevar_pop (TV_JUMP
);
2873 /* Complete generation of exception handling code. */
2874 find_exception_handler_labels ();
2877 timevar_push (TV_JUMP
);
2878 open_dump_file (DFI_eh
, decl
);
2880 finish_eh_generation ();
2882 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2883 timevar_pop (TV_JUMP
);
2887 /* If we are doing position-independent code generation, now
2888 is the time to output special prologues and epilogues.
2889 We do not want to do this earlier, because it just clutters
2890 up inline functions with meaningless insns. */
2895 insns
= get_insns ();
2897 /* Copy any shared structure that should not be shared. */
2898 unshare_all_rtl (current_function_decl
, insns
);
2900 #ifdef SETJMP_VIA_SAVE_AREA
2901 /* This must be performed before virutal register instantiation. */
2902 if (current_function_calls_alloca
)
2903 optimize_save_area_alloca (insns
);
2906 /* Instantiate all virtual registers. */
2907 instantiate_virtual_regs (current_function_decl
, insns
);
2909 open_dump_file (DFI_jump
, decl
);
2911 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2912 are initialized and to compute whether control can drop off the end
2915 timevar_push (TV_JUMP
);
2916 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2917 before jump optimization switches branch directions. */
2918 expected_value_to_br_prob ();
2920 reg_scan (insns
, max_reg_num (), 0);
2921 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2922 JUMP_AFTER_REGSCAN
);
2924 timevar_pop (TV_JUMP
);
2926 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2927 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2929 close_dump_file (DFI_jump
, print_rtl
, insns
);
2930 goto exit_rest_of_compilation
;
2933 timevar_push (TV_JUMP
);
2937 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
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 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2994 !JUMP_AFTER_REGSCAN
);
2995 timevar_pop (TV_JUMP
);
2998 /* Run this after jump optmizations remove all the unreachable code
2999 so that unreachable code will not keep values live. */
3000 delete_trivially_dead_insns (insns
, max_reg_num ());
3002 /* Try to identify useless null pointer tests and delete them. */
3003 if (flag_delete_null_pointer_checks
)
3005 timevar_push (TV_JUMP
);
3006 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3010 delete_null_pointer_checks (insns
);
3011 timevar_pop (TV_JUMP
);
3014 /* The second pass of jump optimization is likely to have
3015 removed a bunch more instructions. */
3016 renumber_insns (rtl_dump_file
);
3018 timevar_pop (TV_CSE
);
3019 close_dump_file (DFI_cse
, print_rtl
, insns
);
3022 open_dump_file (DFI_addressof
, decl
);
3024 purge_addressof (insns
);
3025 reg_scan (insns
, max_reg_num (), 1);
3027 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3031 if (optimize
> 0 && flag_ssa
)
3033 /* Convert to SSA form. */
3035 timevar_push (TV_TO_SSA
);
3036 open_dump_file (DFI_ssa
, decl
);
3038 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3042 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3043 timevar_pop (TV_TO_SSA
);
3045 /* The SSA implementation uses basic block numbers in its phi
3046 nodes. Thus, changing the control-flow graph or the basic
3047 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3048 may cause problems. */
3052 /* Remove dead code. */
3054 timevar_push (TV_DEAD_CODE_ELIM
);
3055 open_dump_file (DFI_dce
, decl
);
3057 insns
= get_insns ();
3058 eliminate_dead_code();
3060 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3061 timevar_pop (TV_DEAD_CODE_ELIM
);
3064 /* Convert from SSA form. */
3066 timevar_push (TV_FROM_SSA
);
3067 open_dump_file (DFI_ussa
, decl
);
3069 convert_from_ssa ();
3070 /* New registers have been created. Rescan their usage. */
3071 reg_scan (insns
, max_reg_num (), 1);
3072 /* Life analysis used in SSA adds log_links but these
3073 shouldn't be there until the flow stage, so clear
3075 clear_log_links (insns
);
3077 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3078 timevar_pop (TV_FROM_SSA
);
3083 /* Perform global cse. */
3085 if (optimize
> 0 && flag_gcse
)
3087 int save_csb
, save_cfj
;
3090 timevar_push (TV_GCSE
);
3091 open_dump_file (DFI_gcse
, decl
);
3093 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3095 tem
= gcse_main (insns
, rtl_dump_file
);
3097 save_csb
= flag_cse_skip_blocks
;
3098 save_cfj
= flag_cse_follow_jumps
;
3099 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3101 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3103 if (flag_expensive_optimizations
)
3105 timevar_push (TV_CSE
);
3106 reg_scan (insns
, max_reg_num (), 1);
3107 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3108 timevar_pop (TV_CSE
);
3109 cse_not_expected
= !flag_rerun_cse_after_loop
;
3112 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3113 things up. Then possibly re-run CSE again. */
3117 timevar_push (TV_JUMP
);
3118 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3119 !JUMP_AFTER_REGSCAN
);
3120 timevar_pop (TV_JUMP
);
3122 if (flag_expensive_optimizations
)
3124 timevar_push (TV_CSE
);
3125 reg_scan (insns
, max_reg_num (), 1);
3126 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3127 timevar_pop (TV_CSE
);
3131 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3132 timevar_pop (TV_GCSE
);
3135 flag_cse_skip_blocks
= save_csb
;
3136 flag_cse_follow_jumps
= save_cfj
;
3139 /* Move constant computations out of loops. */
3143 timevar_push (TV_LOOP
);
3144 open_dump_file (DFI_loop
, decl
);
3146 if (flag_rerun_loop_opt
)
3148 /* We only want to perform unrolling once. */
3150 loop_optimize (insns
, rtl_dump_file
, 0);
3152 /* The first call to loop_optimize makes some instructions
3153 trivially dead. We delete those instructions now in the
3154 hope that doing so will make the heuristics in loop work
3155 better and possibly speed up compilation. */
3156 delete_trivially_dead_insns (insns
, max_reg_num ());
3158 /* The regscan pass is currently necessary as the alias
3159 analysis code depends on this information. */
3160 reg_scan (insns
, max_reg_num (), 1);
3162 loop_optimize (insns
, rtl_dump_file
,
3163 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3165 close_dump_file (DFI_loop
, print_rtl
, insns
);
3166 timevar_pop (TV_LOOP
);
3173 timevar_push (TV_CSE2
);
3174 open_dump_file (DFI_cse2
, decl
);
3176 if (flag_rerun_cse_after_loop
)
3178 /* Running another jump optimization pass before the second
3179 cse pass sometimes simplifies the RTL enough to allow
3180 the second CSE pass to do a better job. Jump_optimize can change
3181 max_reg_num so we must rerun reg_scan afterwards.
3182 ??? Rework to not call reg_scan so often. */
3183 timevar_push (TV_JUMP
);
3185 /* The previous call to loop_optimize makes some instructions
3186 trivially dead. We delete those instructions now in the
3187 hope that doing so will make the heuristics in jump work
3188 better and possibly speed up compilation. */
3189 delete_trivially_dead_insns (insns
, max_reg_num ());
3191 reg_scan (insns
, max_reg_num (), 0);
3192 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3193 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3195 timevar_push (TV_IFCVT
);
3197 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3201 timevar_pop(TV_IFCVT
);
3203 timevar_pop (TV_JUMP
);
3205 reg_scan (insns
, max_reg_num (), 0);
3206 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3210 timevar_push (TV_JUMP
);
3211 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3212 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3213 timevar_pop (TV_JUMP
);
3217 if (flag_thread_jumps
)
3219 /* This pass of jump threading straightens out code
3220 that was kinked by loop optimization. */
3221 timevar_push (TV_JUMP
);
3222 reg_scan (insns
, max_reg_num (), 0);
3223 thread_jumps (insns
, max_reg_num (), 0);
3224 timevar_pop (TV_JUMP
);
3227 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3228 timevar_pop (TV_CSE2
);
3233 cse_not_expected
= 1;
3237 /* Do control and data flow analysis; wrote some of the results to
3240 timevar_push (TV_FLOW
);
3241 open_dump_file (DFI_cfg
, decl
);
3243 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3245 check_function_return_warnings ();
3247 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3249 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3251 timevar_push (TV_BRANCH_PROB
);
3252 open_dump_file (DFI_bp
, decl
);
3256 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3257 timevar_pop (TV_BRANCH_PROB
);
3260 open_dump_file (DFI_life
, decl
);
3265 /* Discover and record the loop depth at the head of each basic
3266 block. The loop infrastructure does the real job for us. */
3267 flow_loops_find (&loops
, LOOP_TREE
);
3269 /* Estimate using heuristics if no profiling info is available. */
3270 if (flag_guess_branch_prob
)
3271 estimate_probability (&loops
);
3274 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3276 flow_loops_free (&loops
);
3278 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3279 mark_constant_function ();
3280 timevar_pop (TV_FLOW
);
3282 register_life_up_to_date
= 1;
3285 if (warn_uninitialized
|| extra_warnings
)
3287 uninitialized_vars_warning (DECL_INITIAL (decl
));
3289 setjmp_args_warning ();
3292 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3296 /* If -opt, try combining insns through substitution. */
3300 int rebuild_jump_labels_after_combine
= 0;
3302 timevar_push (TV_COMBINE
);
3303 open_dump_file (DFI_combine
, decl
);
3305 rebuild_jump_labels_after_combine
3306 = combine_instructions (insns
, max_reg_num ());
3308 /* Combining insns may have turned an indirect jump into a
3309 direct jump. Rebuid the JUMP_LABEL fields of jumping
3311 if (rebuild_jump_labels_after_combine
)
3313 timevar_push (TV_JUMP
);
3314 rebuild_jump_labels (insns
);
3315 timevar_pop (TV_JUMP
);
3317 timevar_push (TV_FLOW
);
3318 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3321 /* Blimey. We've got to have the CFG up to date for the call to
3322 if_convert below. However, the random deletion of blocks
3323 without updating life info can wind up with Wierd Stuff in
3324 global_live_at_end. We then run sched1, which updates things
3325 properly, discovers the wierdness and aborts. */
3326 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3327 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3328 | PROP_SCAN_DEAD_CODE
);
3330 timevar_pop (TV_FLOW
);
3333 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3334 timevar_pop (TV_COMBINE
);
3339 /* Rerun if-conversion, as combine may have simplified things enough to
3340 now meet sequence length restrictions. */
3343 timevar_push (TV_IFCVT
);
3344 open_dump_file (DFI_ce
, decl
);
3350 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3351 timevar_pop (TV_IFCVT
);
3354 /* Register allocation pre-pass, to reduce number of moves
3355 necessary for two-address machines. */
3356 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3358 timevar_push (TV_REGMOVE
);
3359 open_dump_file (DFI_regmove
, decl
);
3361 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3363 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3364 timevar_pop (TV_REGMOVE
);
3369 /* Any of the several passes since flow1 will have munged register
3370 lifetime data a bit. */
3372 register_life_up_to_date
= 0;
3374 #ifdef OPTIMIZE_MODE_SWITCHING
3375 timevar_push (TV_GCSE
);
3377 if (optimize_mode_switching (NULL_PTR
))
3379 /* We did work, and so had to regenerate global life information.
3380 Take advantage of this and don't re-recompute register life
3381 information below. */
3382 register_life_up_to_date
= 1;
3385 timevar_pop (TV_GCSE
);
3388 #ifdef INSN_SCHEDULING
3390 /* Print function header into sched dump now
3391 because doing the sched analysis makes some of the dump. */
3392 if (optimize
> 0 && flag_schedule_insns
)
3394 timevar_push (TV_SCHED
);
3395 open_dump_file (DFI_sched
, decl
);
3397 /* Do control and data sched analysis,
3398 and write some of the results to dump file. */
3400 schedule_insns (rtl_dump_file
);
3402 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3403 timevar_pop (TV_SCHED
);
3407 /* Register lifetime information was updated as part of verifying
3409 register_life_up_to_date
= 1;
3413 /* Determine if the current function is a leaf before running reload
3414 since this can impact optimizations done by the prologue and
3415 epilogue thus changing register elimination offsets. */
3416 current_function_is_leaf
= leaf_function_p ();
3418 timevar_push (TV_LOCAL_ALLOC
);
3419 open_dump_file (DFI_lreg
, decl
);
3421 /* Allocate pseudo-regs that are used only within 1 basic block.
3423 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3424 jump optimizer after register allocation and reloading are finished. */
3426 if (! register_life_up_to_date
)
3427 recompute_reg_usage (insns
, ! optimize_size
);
3428 regclass (insns
, max_reg_num (), rtl_dump_file
);
3429 rebuild_label_notes_after_reload
= local_alloc ();
3431 timevar_pop (TV_LOCAL_ALLOC
);
3433 if (dump_file
[DFI_lreg
].enabled
)
3435 timevar_push (TV_DUMP
);
3437 dump_flow_info (rtl_dump_file
);
3438 dump_local_alloc (rtl_dump_file
);
3440 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3441 timevar_pop (TV_DUMP
);
3446 timevar_push (TV_GLOBAL_ALLOC
);
3447 open_dump_file (DFI_greg
, decl
);
3449 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3450 pass fixing up any insns that are invalid. */
3453 failure
= global_alloc (rtl_dump_file
);
3456 build_insn_chain (insns
);
3457 failure
= reload (insns
, 0);
3460 timevar_pop (TV_GLOBAL_ALLOC
);
3462 if (dump_file
[DFI_greg
].enabled
)
3464 timevar_push (TV_DUMP
);
3466 dump_global_regs (rtl_dump_file
);
3468 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3469 timevar_pop (TV_DUMP
);
3473 goto exit_rest_of_compilation
;
3477 open_dump_file (DFI_postreload
, decl
);
3479 /* Do a very simple CSE pass over just the hard registers. */
3482 timevar_push (TV_RELOAD_CSE_REGS
);
3483 reload_cse_regs (insns
);
3484 timevar_pop (TV_RELOAD_CSE_REGS
);
3487 /* If optimizing, then go ahead and split insns now since we are about
3488 to recompute flow information anyway. Since we can't split insns after
3489 reload, do the splitting unconditionally here to avoid gcc from losing
3497 int old_labelnum
= max_label_num ();
3499 split_all_insns (0);
3500 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3503 /* Register allocation and reloading may have turned an indirect jump into
3504 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3505 jumping instructions. */
3506 if (rebuild_label_notes_after_reload
)
3508 timevar_push (TV_JUMP
);
3510 rebuild_jump_labels (insns
);
3512 timevar_pop (TV_JUMP
);
3515 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3517 /* Re-create the death notes which were deleted during reload. */
3518 timevar_push (TV_FLOW2
);
3519 open_dump_file (DFI_flow2
, decl
);
3521 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3522 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3523 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3525 /* On some machines, the prologue and epilogue code, or parts thereof,
3526 can be represented as RTL. Doing so lets us schedule insns between
3527 it and the rest of the code and also allows delayed branch
3528 scheduling to operate in the epilogue. */
3529 thread_prologue_and_epilogue_insns (insns
);
3534 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3536 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3537 even for machines with possibly nonzero RETURN_POPS_ARGS
3538 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3539 push instructions will have popping returns. */
3540 #ifndef PUSH_ROUNDING
3541 if (!ACCUMULATE_OUTGOING_ARGS
)
3543 combine_stack_adjustments ();
3548 flow2_completed
= 1;
3550 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3551 timevar_pop (TV_FLOW2
);
3553 #ifdef HAVE_peephole2
3554 if (optimize
> 0 && flag_peephole2
)
3556 timevar_push (TV_PEEPHOLE2
);
3557 open_dump_file (DFI_peephole2
, decl
);
3559 peephole2_optimize (rtl_dump_file
);
3561 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3562 timevar_pop (TV_PEEPHOLE2
);
3566 if (optimize
> 0 && flag_rename_registers
)
3568 timevar_push (TV_RENAME_REGISTERS
);
3569 open_dump_file (DFI_rnreg
, decl
);
3571 regrename_optimize ();
3573 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3574 timevar_pop (TV_RENAME_REGISTERS
);
3579 timevar_push (TV_IFCVT2
);
3580 open_dump_file (DFI_ce2
, decl
);
3584 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3585 timevar_pop (TV_IFCVT2
);
3588 #ifdef INSN_SCHEDULING
3589 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3591 timevar_push (TV_SCHED2
);
3592 open_dump_file (DFI_sched2
, decl
);
3594 /* Do control and data sched analysis again,
3595 and write some more of the results to dump file. */
3597 schedule_insns (rtl_dump_file
);
3599 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3600 timevar_pop (TV_SCHED2
);
3606 #ifdef LEAF_REGISTERS
3607 current_function_uses_only_leaf_regs
3608 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3611 if (optimize
> 0 && flag_reorder_blocks
)
3613 timevar_push (TV_REORDER_BLOCKS
);
3614 open_dump_file (DFI_bbro
, decl
);
3616 reorder_basic_blocks ();
3618 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3619 timevar_pop (TV_REORDER_BLOCKS
);
3622 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3623 Also do cross-jumping this time and delete no-op move insns. */
3627 timevar_push (TV_JUMP
);
3628 open_dump_file (DFI_jump2
, decl
);
3630 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3631 !JUMP_AFTER_REGSCAN
);
3633 /* CFG no longer kept up to date. */
3635 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3636 timevar_pop (TV_JUMP
);
3639 /* If a machine dependent reorganization is needed, call it. */
3640 #ifdef MACHINE_DEPENDENT_REORG
3641 open_dump_file (DFI_mach
, decl
);
3643 MACHINE_DEPENDENT_REORG (insns
);
3645 close_dump_file (DFI_mach
, print_rtl
, insns
);
3650 /* If a scheduling pass for delayed branches is to be done,
3651 call the scheduling code. */
3654 if (optimize
> 0 && flag_delayed_branch
)
3656 timevar_push (TV_DBR_SCHED
);
3657 open_dump_file (DFI_dbr
, decl
);
3659 dbr_schedule (insns
, rtl_dump_file
);
3661 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3662 timevar_pop (TV_DBR_SCHED
);
3669 /* ??? Do this before shorten branches so that we aren't creating
3670 insns too late and fail sanity checks in final. */
3671 convert_to_eh_region_ranges ();
3674 /* Shorten branches.
3676 Note this must run before reg-stack because of death note (ab)use
3677 in the ia32 backend. */
3678 timevar_push (TV_SHORTEN_BRANCH
);
3679 shorten_branches (get_insns ());
3680 timevar_pop (TV_SHORTEN_BRANCH
);
3683 timevar_push (TV_REG_STACK
);
3684 open_dump_file (DFI_stack
, decl
);
3686 reg_to_stack (insns
, rtl_dump_file
);
3688 close_dump_file (DFI_stack
, print_rtl
, insns
);
3689 timevar_pop (TV_REG_STACK
);
3693 convert_to_eh_region_ranges ();
3696 current_function_nothrow
= nothrow_function_p ();
3697 if (current_function_nothrow
)
3698 /* Now we know that this can't throw; set the flag for the benefit
3699 of other functions later in this translation unit. */
3700 TREE_NOTHROW (current_function_decl
) = 1;
3702 /* Now turn the rtl into assembler code. */
3704 timevar_push (TV_FINAL
);
3709 /* Get the function's name, as described by its RTL. This may be
3710 different from the DECL_NAME name used in the source file. */
3712 x
= DECL_RTL (decl
);
3713 if (GET_CODE (x
) != MEM
)
3716 if (GET_CODE (x
) != SYMBOL_REF
)
3718 fnname
= XSTR (x
, 0);
3720 assemble_start_function (decl
, fnname
);
3721 final_start_function (insns
, asm_out_file
, optimize
);
3722 final (insns
, asm_out_file
, optimize
, 0);
3723 final_end_function (insns
, asm_out_file
, optimize
);
3724 assemble_end_function (decl
, fnname
);
3726 output_function_exception_table ();
3729 fflush (asm_out_file
);
3731 /* Release all memory allocated by flow. */
3732 free_basic_block_vars (0);
3734 /* Release all memory held by regsets now. */
3735 regset_release_memory ();
3737 timevar_pop (TV_FINAL
);
3741 /* Write DBX symbols if requested. */
3743 /* Note that for those inline functions where we don't initially
3744 know for certain that we will be generating an out-of-line copy,
3745 the first invocation of this routine (rest_of_compilation) will
3746 skip over this code by doing a `goto exit_rest_of_compilation;'.
3747 Later on, finish_compilation will call rest_of_compilation again
3748 for those inline functions that need to have out-of-line copies
3749 generated. During that call, we *will* be routed past here. */
3751 timevar_push (TV_SYMOUT
);
3752 #ifdef DBX_DEBUGGING_INFO
3753 if (write_symbols
== DBX_DEBUG
)
3754 dbxout_function (decl
);
3757 #ifdef DWARF_DEBUGGING_INFO
3758 if (write_symbols
== DWARF_DEBUG
)
3759 dwarfout_file_scope_decl (decl
, 0);
3762 #ifdef DWARF2_DEBUGGING_INFO
3763 if (write_symbols
== DWARF2_DEBUG
)
3764 dwarf2out_decl (decl
);
3766 timevar_pop (TV_SYMOUT
);
3768 exit_rest_of_compilation
:
3770 /* In case the function was not output,
3771 don't leave any temporary anonymous types
3772 queued up for sdb output. */
3773 #ifdef SDB_DEBUGGING_INFO
3774 if (write_symbols
== SDB_DEBUG
)
3775 sdbout_types (NULL_TREE
);
3778 reload_completed
= 0;
3779 flow2_completed
= 0;
3782 timevar_push (TV_FINAL
);
3784 /* Clear out the insn_length contents now that they are no
3786 init_insn_lengths ();
3788 /* Clear out the real_constant_chain before some of the rtx's
3789 it runs through become garbage. */
3790 clear_const_double_mem ();
3792 /* Show no temporary slots allocated. */
3795 free_basic_block_vars (0);
3797 timevar_pop (TV_FINAL
);
3799 /* Make sure volatile mem refs aren't considered valid operands for
3800 arithmetic insns. We must call this here if this is a nested inline
3801 function, since the above code leaves us in the init_recog state
3802 (from final.c), and the function context push/pop code does not
3803 save/restore volatile_ok.
3805 ??? Maybe it isn't necessary for expand_start_function to call this
3806 anymore if we do it here? */
3808 init_recog_no_volatile ();
3810 /* We're done with this function. Free up memory if we can. */
3811 free_after_parsing (cfun
);
3812 if (! DECL_DEFER_OUTPUT (decl
))
3813 free_after_compilation (cfun
);
3818 timevar_pop (TV_REST_OF_COMPILATION
);
3828 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3829 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3830 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3831 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3832 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3833 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"));
3835 for (i
= ARRAY_SIZE (f_options
); i
--;)
3837 const char *description
= f_options
[i
].description
;
3839 if (description
!= NULL
&& * description
!= 0)
3840 printf (" -f%-21s %s\n",
3841 f_options
[i
].string
, description
);
3844 printf (_(" -O[number] Set optimisation level to [number]\n"));
3845 printf (_(" -Os Optimise for space rather than speed\n"));
3846 for (i
= sizeof (compiler_params
); i
--;)
3848 const char *description
= compiler_params
[i
].help
;
3849 const int length
= 21-strlen(compiler_params
[i
].option
);
3851 if (description
!= NULL
&& * description
!= 0)
3852 printf (" --param %s=<value>%.*s%s\n",
3853 compiler_params
[i
].option
,
3854 length
> 0 ? length
: 1, " ",
3857 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3858 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3859 printf (_(" -w Suppress warnings\n"));
3860 printf (_(" -W Enable extra warnings\n"));
3862 for (i
= ARRAY_SIZE (W_options
); i
--;)
3864 const char *description
= W_options
[i
].description
;
3866 if (description
!= NULL
&& * description
!= 0)
3867 printf (" -W%-21s %s\n",
3868 W_options
[i
].string
, description
);
3871 printf (_(" -Wunused Enable unused warnings\n"));
3872 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3873 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3874 printf (_(" -p Enable function profiling\n"));
3875 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3876 printf (_(" -a Enable block profiling \n"));
3878 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3879 printf (_(" -ax Enable jump profiling \n"));
3881 printf (_(" -o <file> Place output into <file> \n"));
3883 -G <number> Put global and static data smaller than <number>\n\
3884 bytes into a special section (on some targets)\n"));
3886 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3888 if (debug_args
[i
].description
!= NULL
)
3889 printf (" -g%-21s %s\n",
3890 debug_args
[i
].arg
, debug_args
[i
].description
);
3893 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3894 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3895 printf (_(" -version Display the compiler's version\n"));
3896 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3897 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3898 #if defined INSN_SCHEDULING
3899 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3901 printf (_(" --help Display this information\n"));
3906 /* Display descriptions of language specific options.
3907 If there is no description, note that there is an undocumented option.
3908 If the description is empty, do not display anything. (This allows
3909 options to be deliberately undocumented, for whatever reason).
3910 If the option string is missing, then this is a marker, indicating
3911 that the description string is in fact the name of a language, whose
3912 language specific options are to follow. */
3914 if (ARRAY_SIZE (documented_lang_options
) > 1)
3916 printf (_("\nLanguage specific options:\n"));
3918 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3920 const char *description
= documented_lang_options
[i
].description
;
3921 const char *option
= documented_lang_options
[i
].option
;
3923 if (description
== NULL
)
3928 printf (_(" %-23.23s [undocumented]\n"), option
);
3930 else if (*description
== 0)
3932 else if (option
== NULL
)
3936 (_("\nThere are undocumented %s specific options as well.\n"),
3940 printf (_("\n Options for %s:\n"), description
);
3945 printf (" %-23.23s %s\n", option
, description
);
3950 printf (_("\nThere are undocumented %s specific options as well.\n"),
3953 display_target_options ();
3957 display_target_options ()
3961 if (ARRAY_SIZE (target_switches
) > 1
3962 #ifdef TARGET_OPTIONS
3963 || ARRAY_SIZE (target_options
) > 1
3971 printf (_("\nTarget specific options:\n"));
3973 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3975 const char *option
= target_switches
[i
].name
;
3976 const char *description
= target_switches
[i
].description
;
3978 if (option
== NULL
|| *option
== 0)
3980 else if (description
== NULL
)
3985 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3987 else if (* description
!= 0)
3988 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3991 #ifdef TARGET_OPTIONS
3992 for (i
= ARRAY_SIZE (target_options
); i
--;)
3994 const char *option
= target_options
[i
].prefix
;
3995 const char *description
= target_options
[i
].description
;
3997 if (option
== NULL
|| *option
== 0)
3999 else if (description
== NULL
)
4004 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4006 else if (* description
!= 0)
4007 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
4013 printf (_("\nThere are undocumented target specific options as well.\n"));
4015 printf (_(" They exist, but they are not documented.\n"));
4020 /* Parse a -d... comand line switch. */
4023 decode_d_option (arg
)
4032 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4033 dump_file
[i
].enabled
= 1;
4039 flag_print_asm_name
= 1;
4042 flag_dump_rtl_in_asm
= 1;
4043 flag_print_asm_name
= 1;
4046 graph_dump_format
= vcg
;
4049 rtl_dump_and_exit
= 1;
4054 case 'D': /* These are handled by the preprocessor. */
4060 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4061 if (c
== dump_file
[i
].debug_switch
)
4063 dump_file
[i
].enabled
= 1;
4068 warning ("unrecognized gcc debugging option: %c", c
);
4073 /* Parse a -f... comand line switch. ARG is the value after the -f.
4074 It is safe to access 'ARG - 2' to generate the full switch name.
4075 Return the number of strings consumed. */
4078 decode_f_option (arg
)
4082 const char *option_value
= NULL
;
4084 /* Search for the option in the table of binary f options. */
4085 for (j
= ARRAY_SIZE (f_options
); j
--;)
4087 if (!strcmp (arg
, f_options
[j
].string
))
4089 *f_options
[j
].variable
= f_options
[j
].on_value
;
4093 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4094 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4096 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4101 if (!strcmp (arg
, "fast-math"))
4102 set_fast_math_flags();
4103 else if (!strcmp (arg
, "no-fast-math"))
4104 set_no_fast_math_flags();
4105 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4106 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4109 read_integral_parameter (option_value
, arg
- 2,
4111 set_param_value ("max-inline-insns", val
);
4113 #ifdef INSN_SCHEDULING
4114 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4115 fix_sched_param ("verbose", option_value
);
4117 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4118 fix_register (option_value
, 1, 1);
4119 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4120 fix_register (option_value
, 0, 1);
4121 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4122 fix_register (option_value
, 0, 0);
4123 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4124 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4125 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4127 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4128 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4129 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4130 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4132 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4133 else if ((option_value
4134 = skip_leading_substring (arg
, "stack-limit-register=")))
4136 int reg
= decode_reg_name (option_value
);
4138 error ("unrecognized register name `%s'", option_value
);
4140 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4142 else if ((option_value
4143 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4146 nm
= ggc_strdup (option_value
);
4147 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4149 else if ((option_value
4150 = skip_leading_substring (arg
, "message-length=")))
4151 diagnostic_message_length_per_line
=
4152 read_integral_parameter (option_value
, arg
- 2,
4153 diagnostic_message_length_per_line
);
4154 else if ((option_value
4155 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4157 if (!strcmp (option_value
, "once"))
4158 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4159 else if (!strcmp (option_value
, "every-line"))
4160 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4162 error ("Unrecognized option `%s'", arg
- 2);
4164 else if (!strcmp (arg
, "no-stack-limit"))
4165 stack_limit_rtx
= NULL_RTX
;
4166 else if (!strcmp (arg
, "preprocessed"))
4167 /* Recognise this switch but do nothing. This prevents warnings
4168 about an unrecognized switch if cpplib has not been linked in. */
4176 /* Parse a -W... comand line switch. ARG is the value after the -W.
4177 It is safe to access 'ARG - 2' to generate the full switch name.
4178 Return the number of strings consumed. */
4181 decode_W_option (arg
)
4184 const char *option_value
= NULL
;
4187 /* Search for the option in the table of binary W options. */
4189 for (j
= ARRAY_SIZE (W_options
); j
--;)
4191 if (!strcmp (arg
, W_options
[j
].string
))
4193 *W_options
[j
].variable
= W_options
[j
].on_value
;
4197 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4198 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4200 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4205 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4207 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4209 if (id_clash_len
!= -1)
4212 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4214 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4216 warn_larger_than
= larger_than_size
!= -1;
4218 else if (!strcmp (arg
, "unused"))
4222 else if (!strcmp (arg
, "no-unused"))
4232 /* Parse a -g... comand line switch. ARG is the value after the -g.
4233 It is safe to access 'ARG - 2' to generate the full switch name.
4234 Return the number of strings consumed. */
4237 decode_g_option (arg
)
4241 /* A lot of code assumes write_symbols == NO_DEBUG if the
4242 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4243 of what debugging type has been selected). This records the
4244 selected type. It is an error to specify more than one
4246 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4247 /* Non-zero if debugging format has been explicitly set.
4248 -g and -ggdb don't explicitly set the debugging format so
4249 -gdwarf -g3 is equivalent to -gdwarf3. */
4250 static int type_explicitly_set_p
= 0;
4251 /* Indexed by enum debug_info_type. */
4252 static const char *debug_type_names
[] =
4254 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4257 /* The maximum admissible debug level value. */
4258 static const unsigned max_debug_level
= 3;
4260 /* Look up ARG in the table. */
4261 for (da
= debug_args
; da
->arg
; da
++)
4263 const int da_len
= strlen (da
->arg
);
4265 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4267 enum debug_info_type type
= da
->debug_type
;
4268 const char *p
= arg
+ da_len
;
4270 if (*p
&& (*p
< '0' || *p
> '9'))
4273 /* A debug flag without a level defaults to level 2.
4274 Note we do not want to call read_integral_parameter
4275 for that case since it will call atoi which
4278 ??? We may want to generalize the interface to
4279 read_integral_parameter to better handle this case
4280 if this case shows up often. */
4282 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4286 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4288 error ("use -gdwarf -g%d for DWARF v1, level %d",
4291 error ("use -gdwarf-2 for DWARF v2");
4294 if (level
> max_debug_level
)
4297 ignoring option `%s' due to invalid debug level specification",
4299 level
= debug_info_level
;
4302 if (type
== NO_DEBUG
)
4304 type
= PREFERRED_DEBUGGING_TYPE
;
4306 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4308 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4309 type
= DWARF2_DEBUG
;
4311 #ifdef DBX_DEBUGGING_INFO
4318 if (type
== NO_DEBUG
)
4319 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4321 /* Does it conflict with an already selected type? */
4322 if (type_explicitly_set_p
4323 /* -g/-ggdb don't conflict with anything. */
4324 && da
->debug_type
!= NO_DEBUG
4325 && type
!= selected_debug_type
)
4326 warning ("`%s' ignored, conflicts with `-g%s'",
4327 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4330 /* If the format has already been set, -g/-ggdb
4331 only change the debug level. */
4332 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4333 /* Don't change debugging type. */
4337 selected_debug_type
= type
;
4338 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4341 write_symbols
= (level
== 0
4343 : selected_debug_type
);
4344 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4345 debug_info_level
= (enum debug_info_level
) level
;
4358 /* Decode the first argument in the argv as a language-independent option.
4359 Return the number of strings consumed. */
4362 independent_decode_option (argc
, argv
)
4366 char *arg
= argv
[0];
4368 if (arg
[0] != '-' || arg
[1] == 0)
4380 if (!strcmp (arg
, "-help"))
4383 exit_after_options
= 1;
4386 if (!strcmp (arg
, "-target-help"))
4388 display_target_options ();
4389 exit_after_options
= 1;
4392 if (!strcmp (arg
, "-version"))
4394 print_version (stderr
, "");
4395 exit_after_options
= 1;
4398 /* Handle '--param <name>=<value>'. */
4399 if (strcmp (arg
, "-param") == 0)
4405 error ("-param option missing argument");
4409 /* Get the '<name>=<value>' parameter. */
4411 /* Look for the `='. */
4412 equal
= strchr (arg
, '=');
4414 error ("invalid --param option: %s", arg
);
4419 /* Zero out the `=' sign so that we get two separate strings. */
4421 /* Figure out what value is specified. */
4422 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4423 if (val
!= INVALID_PARAM_VAL
)
4424 set_param_value (arg
, val
);
4426 error ("invalid parameter value `%s'", equal
+ 1);
4441 /* Already been treated in main (). Do nothing. */
4445 set_target_switch (arg
+ 1);
4449 return decode_f_option (arg
+ 1);
4452 return decode_g_option (arg
+ 1);
4455 if (!strcmp (arg
, "dumpbase"))
4460 dump_base_name
= argv
[1];
4464 decode_d_option (arg
+ 1);
4468 if (!strcmp (arg
, "pedantic"))
4470 else if (!strcmp (arg
, "pedantic-errors"))
4471 flag_pedantic_errors
= pedantic
= 1;
4472 else if (arg
[1] == 0)
4479 if (!strcmp (arg
, "quiet"))
4486 if (!strcmp (arg
, "version"))
4494 inhibit_warnings
= 1;
4503 /* We save the value of warn_uninitialized, since if they put
4504 -Wuninitialized on the command line, we need to generate a
4505 warning about not using it without also specifying -O. */
4506 if (warn_uninitialized
!= 1)
4507 warn_uninitialized
= 2;
4510 return decode_W_option (arg
+ 1);
4516 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4517 warning ("`-a' option (basic block profile) not supported");
4519 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4522 else if (!strcmp (arg
, "ax"))
4524 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4525 warning ("`-ax' option (jump profiling) not supported");
4527 profile_block_flag
= (!profile_block_flag
4528 || profile_block_flag
== 2) ? 2 : 3;
4531 else if (!strncmp (arg
, "aux-info", 8))
4533 flag_gen_aux_info
= 1;
4539 aux_info_file_name
= argv
[1];
4543 aux_info_file_name
= arg
+ 8;
4555 asm_file_name
= argv
[1];
4570 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4575 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4579 if (g_switch_val
== -1)
4583 g_switch_set
= TRUE
;
4584 g_switch_value
= g_switch_val
;
4594 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4595 Decode command args, then call compile_file.
4596 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4597 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4599 It is not safe to call this function more than once. */
4602 toplev_main (argc
, argv
)
4609 /* save in case md file wants to emit args as a comment. */
4613 p
= argv
[0] + strlen (argv
[0]);
4614 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4618 xmalloc_set_program_name (progname
);
4620 /* LC_CTYPE determines the character set used by the terminal so it has be set
4621 to output messages correctly. */
4623 #ifdef HAVE_LC_MESSAGES
4624 setlocale (LC_CTYPE
, "");
4625 setlocale (LC_MESSAGES
, "");
4627 setlocale (LC_ALL
, "");
4630 (void) bindtextdomain (PACKAGE
, localedir
);
4631 (void) textdomain (PACKAGE
);
4633 /* Install handler for SIGFPE, which may be received while we do
4634 compile-time floating point arithmetic. */
4635 signal (SIGFPE
, float_signal
);
4637 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4639 signal (SIGSEGV
, crash_signal
);
4642 signal (SIGILL
, crash_signal
);
4645 signal (SIGBUS
, crash_signal
);
4648 signal (SIGABRT
, crash_signal
);
4650 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4651 signal (SIGIOT
, crash_signal
);
4654 decl_printable_name
= decl_name
;
4655 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4657 /* Initialize whether `char' is signed. */
4658 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4659 #ifdef DEFAULT_SHORT_ENUMS
4660 /* Initialize how much space enums occupy, by default. */
4661 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4664 /* Initialize the garbage-collector. */
4667 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4668 ggc_add_tree_root (¤t_function_decl
, 1);
4669 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4671 /* Initialize the diagnostics reporting machinery. */
4672 initialize_diagnostics ();
4674 /* Register the language-independent parameters. */
4675 add_params (lang_independent_params
, LAST_PARAM
);
4677 /* Perform language-specific options intialization. */
4678 if (lang_hooks
.init_options
)
4679 (*lang_hooks
.init_options
) ();
4681 /* Scan to see what optimization level has been specified. That will
4682 determine the default value of many flags. */
4683 for (i
= 1; i
< argc
; i
++)
4685 if (!strcmp (argv
[i
], "-O"))
4690 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4692 /* Handle -Os, -O2, -O3, -O69, ... */
4693 char *p
= &argv
[i
][2];
4695 if ((p
[0] == 's') && (p
[1] == 0))
4699 /* Optimizing for size forces optimize to be 2. */
4704 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4705 if (optimize_val
!= -1)
4707 optimize
= optimize_val
;
4717 flag_thread_jumps
= 1;
4719 flag_delayed_branch
= 1;
4721 #ifdef CAN_DEBUG_WITHOUT_FP
4722 flag_omit_frame_pointer
= 1;
4724 flag_guess_branch_prob
= 1;
4729 flag_optimize_sibling_calls
= 1;
4730 flag_cse_follow_jumps
= 1;
4731 flag_cse_skip_blocks
= 1;
4733 flag_expensive_optimizations
= 1;
4734 flag_strength_reduce
= 1;
4735 flag_rerun_cse_after_loop
= 1;
4736 flag_rerun_loop_opt
= 1;
4737 flag_caller_saves
= 1;
4740 #ifdef INSN_SCHEDULING
4741 flag_schedule_insns
= 1;
4742 flag_schedule_insns_after_reload
= 1;
4745 flag_strict_aliasing
= 1;
4746 flag_delete_null_pointer_checks
= 1;
4747 flag_reorder_blocks
= 1;
4752 flag_inline_functions
= 1;
4753 flag_rename_registers
= 1;
4756 if (optimize
< 2 || optimize_size
)
4761 align_functions
= 1;
4764 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4767 set_target_switch ("");
4769 /* Unwind tables are always present in an ABI-conformant IA-64
4770 object file, so the default should be ON. */
4771 #ifdef IA64_UNWIND_INFO
4772 flag_unwind_tables
= IA64_UNWIND_INFO
;
4775 #ifdef OPTIMIZATION_OPTIONS
4776 /* Allow default optimizations to be specified on a per-machine basis. */
4777 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4780 /* Initialize register usage now so switches may override. */
4783 /* Perform normal command line switch decoding. */
4784 for (i
= 1; i
< argc
;)
4787 int indep_processed
;
4789 /* Give the language a chance to decode the option for itself. */
4790 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4792 if (lang_processed
>= 0)
4793 /* Now see if the option also has a language independent meaning.
4794 Some options are both language specific and language independent,
4796 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4799 lang_processed
= -lang_processed
;
4800 indep_processed
= 0;
4803 if (lang_processed
|| indep_processed
)
4804 i
+= MAX (lang_processed
, indep_processed
);
4807 const char *option
= NULL
;
4808 const char *lang
= NULL
;
4811 /* It is possible that the command line switch is not valid for the
4812 current language, but it is valid for another language. In order
4813 to be compatible with previous versions of the compiler (which
4814 did not issue an error message in this case) we check for this
4815 possibility here. If we do find a match, then if extra_warnings
4816 is set we generate a warning message, otherwise we will just
4817 ignore the option. */
4818 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4820 option
= documented_lang_options
[j
].option
;
4823 lang
= documented_lang_options
[j
].description
;
4824 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4828 if (j
!= ARRAY_SIZE (documented_lang_options
))
4832 warning ("Ignoring command line option '%s'", argv
[i
]);
4835 ("(It is valid for %s but not the selected language)",
4839 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4840 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4842 error ("Unrecognized option `%s'", argv
[i
]);
4848 /* All command line options have been processed. */
4849 if (lang_hooks
.post_options
)
4850 (*lang_hooks
.post_options
) ();
4852 if (exit_after_options
)
4855 /* Reflect any language-specific diagnostic option setting. */
4856 reshape_diagnostic_buffer ();
4858 /* Checker uses the frame pointer. */
4859 if (flag_check_memory_usage
)
4860 flag_omit_frame_pointer
= 0;
4864 /* Inlining does not work if not optimizing,
4865 so force it not to be done. */
4869 /* The c_decode_option function and decode_option hook set
4870 this to `2' if -Wall is used, so we can avoid giving out
4871 lots of errors for people who don't realize what -Wall does. */
4872 if (warn_uninitialized
== 1)
4873 warning ("-Wuninitialized is not supported without -O");
4876 #ifdef OVERRIDE_OPTIONS
4877 /* Some machines may reject certain combinations of options. */
4881 /* Set up the align_*_log variables, defaulting them to 1 if they
4882 were still unset. */
4883 if (align_loops
<= 0) align_loops
= 1;
4884 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4885 if (align_jumps
<= 0) align_jumps
= 1;
4886 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4887 if (align_labels
<= 0) align_labels
= 1;
4888 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4889 if (align_functions
<= 0) align_functions
= 1;
4890 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4892 if (profile_block_flag
== 3)
4894 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4895 profile_block_flag
= 2;
4898 /* Unrolling all loops implies that standard loop unrolling must also
4900 if (flag_unroll_all_loops
)
4901 flag_unroll_loops
= 1;
4902 /* Loop unrolling requires that strength_reduction be on also. Silently
4903 turn on strength reduction here if it isn't already on. Also, the loop
4904 unrolling code assumes that cse will be run after loop, so that must
4905 be turned on also. */
4906 if (flag_unroll_loops
)
4908 flag_strength_reduce
= 1;
4909 flag_rerun_cse_after_loop
= 1;
4912 /* Warn about options that are not supported on this machine. */
4913 #ifndef INSN_SCHEDULING
4914 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4915 warning ("instruction scheduling not supported on this target machine");
4918 if (flag_delayed_branch
)
4919 warning ("this target machine does not have delayed branches");
4922 user_label_prefix
= USER_LABEL_PREFIX
;
4923 if (flag_leading_underscore
!= -1)
4925 /* If the default prefix is more complicated than "" or "_",
4926 issue a warning and ignore this option. */
4927 if (user_label_prefix
[0] == 0 ||
4928 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4930 user_label_prefix
= flag_leading_underscore
? "_" : "";
4933 warning ("-f%sleading-underscore not supported on this target machine",
4934 flag_leading_underscore
? "" : "no-");
4937 /* If we are in verbose mode, write out the version and maybe all the
4938 option flags in use. */
4941 print_version (stderr
, "");
4943 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4946 compile_file (filename
);
4949 return (FATAL_EXIT_CODE
);
4951 return (FATAL_EXIT_CODE
);
4952 return (SUCCESS_EXIT_CODE
);
4955 /* Decode -m switches. */
4956 /* Decode the switch -mNAME. */
4959 set_target_switch (name
)
4963 int valid_target_option
= 0;
4965 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4966 if (!strcmp (target_switches
[j
].name
, name
))
4968 if (target_switches
[j
].value
< 0)
4969 target_flags
&= ~-target_switches
[j
].value
;
4971 target_flags
|= target_switches
[j
].value
;
4972 valid_target_option
= 1;
4975 #ifdef TARGET_OPTIONS
4976 if (!valid_target_option
)
4977 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4979 int len
= strlen (target_options
[j
].prefix
);
4980 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4982 *target_options
[j
].variable
= name
+ len
;
4983 valid_target_option
= 1;
4988 if (!valid_target_option
)
4989 error ("Invalid option `%s'", name
);
4992 /* Print version information to FILE.
4993 Each line begins with INDENT (for the case where FILE is the
4994 assembler output file). */
4997 print_version (file
, indent
)
5002 #define __VERSION__ "[?]"
5006 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5008 "%s%s%s version %s (%s) compiled by CC.\n"
5010 , indent
, *indent
!= 0 ? " " : "",
5011 language_string
, version_string
, TARGET_NAME
,
5012 indent
, __VERSION__
);
5015 /* Print an option value and return the adjusted position in the line.
5016 ??? We don't handle error returns from fprintf (disk full); presumably
5017 other code will catch a disk full though. */
5020 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5023 const char *indent
, *sep
, *term
, *type
, *name
;
5025 /* The ultrix fprintf returns 0 on success, so compute the result we want
5026 here since we need it for the following test. */
5027 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5032 fprintf (file
, "%s", term
);
5037 fprintf (file
, "%s", indent
);
5038 pos
= strlen (indent
);
5040 fprintf (file
, "%s%s%s", sep
, type
, name
);
5045 /* Print active target switches to FILE.
5046 POS is the current cursor position and MAX is the size of a "line".
5047 Each line begins with INDENT and ends with TERM.
5048 Each switch is separated from the next by SEP. */
5051 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5054 const char *indent
, *sep
, *term
;
5059 /* Print the options as passed. */
5061 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5062 _("options passed: "), "");
5064 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5068 if (strcmp (*p
, "-o") == 0)
5074 if (strcmp (*p
, "-quiet") == 0)
5076 if (strcmp (*p
, "-version") == 0)
5081 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5084 fprintf (file
, "%s", term
);
5086 /* Print the -f and -m options that have been enabled.
5087 We don't handle language specific options but printing argv
5090 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5091 _("options enabled: "), "");
5093 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5094 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5095 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5096 "-f", f_options
[j
].string
);
5098 /* Print target specific options. */
5100 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5101 if (target_switches
[j
].name
[0] != '\0'
5102 && target_switches
[j
].value
> 0
5103 && ((target_switches
[j
].value
& target_flags
)
5104 == target_switches
[j
].value
))
5106 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5107 "-m", target_switches
[j
].name
);
5110 #ifdef TARGET_OPTIONS
5111 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5112 if (*target_options
[j
].variable
!= NULL
)
5115 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5116 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5117 prefix
, *target_options
[j
].variable
);
5121 fprintf (file
, "%s", term
);
5124 /* Record the beginning of a new source file, named FILENAME. */
5127 debug_start_source_file (filename
)
5128 register const char *filename ATTRIBUTE_UNUSED
;
5130 #ifdef DBX_DEBUGGING_INFO
5131 if (write_symbols
== DBX_DEBUG
)
5132 dbxout_start_new_source_file (filename
);
5134 #ifdef DWARF_DEBUGGING_INFO
5135 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5136 && write_symbols
== DWARF_DEBUG
)
5137 dwarfout_start_new_source_file (filename
);
5138 #endif /* DWARF_DEBUGGING_INFO */
5139 #ifdef DWARF2_DEBUGGING_INFO
5140 if (write_symbols
== DWARF2_DEBUG
)
5141 dwarf2out_start_source_file (filename
);
5142 #endif /* DWARF2_DEBUGGING_INFO */
5143 #ifdef SDB_DEBUGGING_INFO
5144 if (write_symbols
== SDB_DEBUG
)
5145 sdbout_start_new_source_file (filename
);
5149 /* Record the resumption of a source file. LINENO is the line number in
5150 the source file we are returning to. */
5153 debug_end_source_file (lineno
)
5154 register unsigned lineno ATTRIBUTE_UNUSED
;
5156 #ifdef DBX_DEBUGGING_INFO
5157 if (write_symbols
== DBX_DEBUG
)
5158 dbxout_resume_previous_source_file ();
5160 #ifdef DWARF_DEBUGGING_INFO
5161 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5162 && write_symbols
== DWARF_DEBUG
)
5163 dwarfout_resume_previous_source_file (lineno
);
5164 #endif /* DWARF_DEBUGGING_INFO */
5165 #ifdef DWARF2_DEBUGGING_INFO
5166 if (write_symbols
== DWARF2_DEBUG
)
5167 dwarf2out_end_source_file ();
5168 #endif /* DWARF2_DEBUGGING_INFO */
5169 #ifdef SDB_DEBUGGING_INFO
5170 if (write_symbols
== SDB_DEBUG
)
5171 sdbout_resume_previous_source_file ();
5175 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5176 the tail part of the directive line, i.e. the part which is past the
5177 initial whitespace, #, whitespace, directive-name, whitespace part. */
5180 debug_define (lineno
, buffer
)
5181 register unsigned lineno ATTRIBUTE_UNUSED
;
5182 register const char *buffer ATTRIBUTE_UNUSED
;
5184 #ifdef DWARF_DEBUGGING_INFO
5185 if (write_symbols
== DWARF_DEBUG
)
5186 dwarfout_define (lineno
, buffer
);
5187 #endif /* DWARF_DEBUGGING_INFO */
5188 #ifdef DWARF2_DEBUGGING_INFO
5189 if (write_symbols
== DWARF2_DEBUG
)
5190 dwarf2out_define (lineno
, buffer
);
5191 #endif /* DWARF2_DEBUGGING_INFO */
5194 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5195 the tail part of the directive line, i.e. the part which is past the
5196 initial whitespace, #, whitespace, directive-name, whitespace part. */
5199 debug_undef (lineno
, buffer
)
5200 register unsigned lineno ATTRIBUTE_UNUSED
;
5201 register const char *buffer ATTRIBUTE_UNUSED
;
5203 #ifdef DWARF_DEBUGGING_INFO
5204 if (write_symbols
== DWARF_DEBUG
)
5205 dwarfout_undef (lineno
, buffer
);
5206 #endif /* DWARF_DEBUGGING_INFO */
5207 #ifdef DWARF2_DEBUGGING_INFO
5208 if (write_symbols
== DWARF2_DEBUG
)
5209 dwarf2out_undef (lineno
, buffer
);
5210 #endif /* DWARF2_DEBUGGING_INFO */
5213 /* Returns nonzero if it is appropriate not to emit any debugging
5214 information for BLOCK, because it doesn't contain any instructions.
5215 This may not be the case for blocks containing nested functions, since
5216 we may actually call such a function even though the BLOCK information
5220 debug_ignore_block (block
)
5221 tree block ATTRIBUTE_UNUSED
;
5223 /* Never delete the BLOCK for the outermost scope
5224 of the function; we can refer to names from
5225 that scope even if the block notes are messed up. */
5226 if (is_body_block (block
))
5229 #ifdef DWARF2_DEBUGGING_INFO
5230 if (write_symbols
== DWARF2_DEBUG
)
5231 return dwarf2out_ignore_block (block
);