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-codes.h"
49 #include "insn-config.h"
50 #include "hard-reg-set.h"
57 #include "basic-block.h"
64 #include "diagnostic.h"
68 #ifndef ACCUMULATE_OUTGOING_ARGS
69 #define ACCUMULATE_OUTGOING_ARGS 0
72 #ifdef DWARF_DEBUGGING_INFO
76 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
77 #include "dwarf2out.h"
80 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
84 #ifdef SDB_DEBUGGING_INFO
88 #ifdef XCOFF_DEBUGGING_INFO
93 /* The extra parameters substantially improve the I/O performance. */
96 vms_fopen (fname
, type
)
100 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
101 fixed arguments, which matches ANSI's specification but not VAXCRTL's
102 pre-ANSI implementation. This hack circumvents the mismatch problem. */
103 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
106 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
107 "deq=64", "fop=tef", "shr=nil");
109 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
112 #define fopen vms_fopen
115 #ifndef DEFAULT_GDB_EXTENSIONS
116 #define DEFAULT_GDB_EXTENSIONS 1
119 /* If more than one debugging type is supported, you must define
120 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
122 This is one long line cause VAXC can't handle a \-newline. */
123 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
124 #ifndef PREFERRED_DEBUGGING_TYPE
125 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
126 #endif /* no PREFERRED_DEBUGGING_TYPE */
127 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
128 so the following code needn't care. */
129 #ifdef DBX_DEBUGGING_INFO
130 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
132 #ifdef SDB_DEBUGGING_INFO
133 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
135 #ifdef DWARF_DEBUGGING_INFO
136 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
138 #ifdef DWARF2_DEBUGGING_INFO
139 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
141 #ifdef XCOFF_DEBUGGING_INFO
142 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
144 #endif /* More than one debugger format enabled. */
146 /* If still not defined, must have been because no debugging formats
148 #ifndef PREFERRED_DEBUGGING_TYPE
149 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
152 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
153 extern char **environ
;
156 /* Carry information from ASM_DECLARE_OBJECT_NAME
157 to ASM_FINISH_DECLARE_OBJECT. */
159 extern int size_directive_output
;
160 extern tree last_assemble_variable_decl
;
162 static void set_target_switch
PARAMS ((const char *));
163 static const char *decl_name
PARAMS ((tree
, int));
165 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
166 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
167 #ifdef ASM_IDENTIFY_LANGUAGE
168 /* This might or might not be used in ASM_IDENTIFY_LANGUAGE. */
169 static void output_lang_identify
PARAMS ((FILE *)) ATTRIBUTE_UNUSED
;
171 static void compile_file
PARAMS ((const char *));
172 static void display_help
PARAMS ((void));
173 static void display_target_options
PARAMS ((void));
175 static void decode_d_option
PARAMS ((const char *));
176 static int decode_f_option
PARAMS ((const char *));
177 static int decode_W_option
PARAMS ((const char *));
178 static int decode_g_option
PARAMS ((const char *));
179 static unsigned int independent_decode_option
PARAMS ((int, char **));
181 static void print_version
PARAMS ((FILE *, const char *));
182 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
183 const char *, const char *,
184 const char *, const char *));
185 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
186 const char *, const char *));
188 /* Length of line when printing switch values. */
191 /* Name of program invoked, sans directories. */
193 const char *progname
;
195 /* Copy of arguments to toplev_main. */
199 /* Name of current original source file (what was input to cpp).
200 This comes from each #-command in the actual input. */
202 const char *input_filename
;
204 /* Name of top-level original source file (what was input to cpp).
205 This comes from the #-command at the beginning of the actual input.
206 If there isn't any there, then this is the cc1 input file name. */
208 const char *main_input_filename
;
210 /* Current line number in real source file. */
214 /* Nonzero if it is unsafe to create any new pseudo registers. */
217 /* Stack of currently pending input files. */
219 struct file_stack
*input_file_stack
;
221 /* Incremented on each change to input_file_stack. */
222 int input_file_stack_tick
;
224 /* Name to use as base of names for dump output files. */
226 const char *dump_base_name
;
228 /* Bit flags that specify the machine subtype we are compiling for.
229 Bits are tested using macros TARGET_... defined in the tm.h file
230 and set by `-m...' switches. Must be defined in rtlanal.c. */
232 extern int target_flags
;
234 /* Describes a dump file. */
236 struct dump_file_info
238 /* The unique extension to apply, e.g. ".jump". */
239 const char *const extension
;
241 /* The -d<c> character that enables this dump file. */
242 char const debug_switch
;
244 /* True if there is a corresponding graph dump file. */
245 char const graph_dump_p
;
247 /* True if the user selected this dump. */
250 /* True if the files have been initialized (ie truncated). */
254 /* Enumerate the extant dump files. */
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 struct dump_file_info dump_file
[DFI_MAX
] =
303 { "rtl", 'r', 0, 0, 0 },
304 { "sibling", 'i', 0, 0, 0 },
305 { "jump", 'j', 0, 0, 0 },
306 { "cse", 's', 0, 0, 0 },
307 { "addressof", 'F', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "dce", 'X', 1, 0, 0 },
310 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
311 { "gcse", 'G', 1, 0, 0 },
312 { "loop", 'L', 1, 0, 0 },
313 { "cse2", 't', 1, 0, 0 },
314 { "cfg", 'f', 1, 0, 0 },
315 { "bp", 'b', 1, 0, 0 },
316 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
317 { "combine", 'c', 1, 0, 0 },
318 { "ce", 'C', 1, 0, 0 },
319 { "regmove", 'N', 1, 0, 0 },
320 { "sched", 'S', 1, 0, 0 },
321 { "lreg", 'l', 1, 0, 0 },
322 { "greg", 'g', 1, 0, 0 },
323 { "postreload", 'o', 1, 0, 0 },
324 { "flow2", 'w', 1, 0, 0 },
325 { "peephole2", 'z', 1, 0, 0 },
326 { "rnreg", 'n', 1, 0, 0 },
327 { "ce2", 'E', 1, 0, 0 },
328 { "sched2", 'R', 1, 0, 0 },
329 { "bbro", 'B', 1, 0, 0 },
330 { "jump2", 'J', 1, 0, 0 },
331 { "mach", 'M', 1, 0, 0 },
332 { "dbr", 'd', 0, 0, 0 },
333 { "stack", 'k', 1, 0, 0 },
336 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
337 static void close_dump_file
PARAMS ((enum dump_file_index
,
338 void (*) (FILE *, rtx
), rtx
));
340 /* Other flags saying which kinds of debugging dump have been requested. */
342 int rtl_dump_and_exit
;
343 int flag_print_asm_name
;
344 static int flag_print_mem
;
345 static int version_flag
;
346 static char *filename
;
347 enum graph_dump_types graph_dump_format
;
349 /* Name for output file of assembly code, specified with -o. */
353 /* Value of the -G xx switch, and whether it was passed or not. */
357 /* Type(s) of debugging information we are producing (if any).
358 See flags.h for the definitions of the different possible
359 types of debugging information. */
360 enum debug_info_type write_symbols
= NO_DEBUG
;
362 /* Level of debugging information we are producing. See flags.h
363 for the definitions of the different possible levels. */
364 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
366 /* Nonzero means use GNU-only extensions in the generated symbolic
367 debugging information. */
368 /* Currently, this only has an effect when write_symbols is set to
369 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
370 int use_gnu_debug_info_extensions
= 0;
372 /* Nonzero means do optimizations. -O.
373 Particular numeric values stand for particular amounts of optimization;
374 thus, -O2 stores 2 here. However, the optimizations beyond the basic
375 ones are not controlled directly by this variable. Instead, they are
376 controlled by individual `flag_...' variables that are defaulted
377 based on this variable. */
381 /* Nonzero means optimize for size. -Os.
382 The only valid values are zero and non-zero. When optimize_size is
383 non-zero, optimize defaults to 2, but certain individual code
384 bloating optimizations are disabled. */
386 int optimize_size
= 0;
388 /* Number of error messages and warning messages so far. */
391 int warningcount
= 0;
394 /* Nonzero if we should exit after parsing options. */
395 static int exit_after_options
= 0;
397 /* The FUNCTION_DECL for the function currently being compiled,
398 or 0 if between functions. */
399 tree current_function_decl
;
401 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
403 tree current_function_func_begin_label
;
405 /* Pointer to function to compute the name to use to print a declaration.
406 DECL is the declaration in question.
407 VERBOSITY determines what information will be printed:
408 0: DECL_NAME, demangled as necessary.
409 1: and scope information.
410 2: and any other information that might be interesting, such as function
411 parameter types in C++. */
413 const char *(*decl_printable_name
) PARAMS ((tree
, int));
415 /* Pointer to function to compute rtl for a language-specific tree code. */
417 typedef rtx (*lang_expand_expr_t
)
418 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
419 enum expand_modifier modifier
));
421 lang_expand_expr_t lang_expand_expr
= 0;
423 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
425 /* Pointer to function to finish handling an incomplete decl at the
426 end of compilation. */
428 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
430 /* Nonzero if doing dwarf2 duplicate elimination. */
432 int flag_eliminate_dwarf2_dups
= 0;
434 /* Nonzero if generating code to do profiling. */
436 int profile_flag
= 0;
438 /* Nonzero if generating code to do profiling on a line-by-line basis. */
440 int profile_block_flag
;
442 /* Nonzero if generating code to profile program flow graph arcs. */
444 int profile_arc_flag
= 0;
446 /* Nonzero if generating info for gcov to calculate line test coverage. */
448 int flag_test_coverage
= 0;
450 /* Nonzero indicates that branch taken probabilities should be calculated. */
452 int flag_branch_probabilities
= 0;
454 /* Nonzero if basic blocks should be reordered. */
456 int flag_reorder_blocks
= 0;
458 /* Nonzero if registers should be renamed. */
460 int flag_rename_registers
= 0;
462 /* Nonzero for -pedantic switch: warn about anything
463 that standard spec forbids. */
467 /* Temporarily suppress certain warnings.
468 This is set while reading code from a system header file. */
470 int in_system_header
= 0;
472 /* Don't print functions as they are compiled. -quiet. */
476 /* Print times taken by the various passes. -ftime-report. */
480 /* Print memory still in use at end of compilation (which may have little
481 to do with peak memory consumption). -fmem-report. */
485 /* Non-zero means to collect statistics which might be expensive
486 and to print them when we are done. */
487 int flag_detailed_statistics
= 0;
492 /* Nonzero means `char' should be signed. */
494 int flag_signed_char
;
496 /* Nonzero means give an enum type only as many bytes as it needs. */
498 int flag_short_enums
;
500 /* Nonzero for -fcaller-saves: allocate values in regs that need to
501 be saved across function calls, if that produces overall better code.
502 Optional now, so people can test it. */
504 #ifdef DEFAULT_CALLER_SAVES
505 int flag_caller_saves
= 1;
507 int flag_caller_saves
= 0;
510 /* Nonzero if structures and unions should be returned in memory.
512 This should only be defined if compatibility with another compiler or
513 with an ABI is needed, because it results in slower code. */
515 #ifndef DEFAULT_PCC_STRUCT_RETURN
516 #define DEFAULT_PCC_STRUCT_RETURN 1
519 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
521 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
523 /* Nonzero for -fforce-mem: load memory value into a register
524 before arithmetic on it. This makes better cse but slower compilation. */
526 int flag_force_mem
= 0;
528 /* Nonzero for -fforce-addr: load memory address into a register before
529 reference to memory. This makes better cse but slower compilation. */
531 int flag_force_addr
= 0;
533 /* Nonzero for -fdefer-pop: don't pop args after each function call;
534 instead save them up to pop many calls' args with one insns. */
536 int flag_defer_pop
= 0;
538 /* Nonzero for -ffloat-store: don't allocate floats and doubles
539 in extended-precision registers. */
541 int flag_float_store
= 0;
543 /* Nonzero for -fcse-follow-jumps:
544 have cse follow jumps to do a more extensive job. */
546 int flag_cse_follow_jumps
;
548 /* Nonzero for -fcse-skip-blocks:
549 have cse follow a branch around a block. */
550 int flag_cse_skip_blocks
;
552 /* Nonzero for -fexpensive-optimizations:
553 perform miscellaneous relatively-expensive optimizations. */
554 int flag_expensive_optimizations
;
556 /* Nonzero for -fthread-jumps:
557 have jump optimize output of loop. */
559 int flag_thread_jumps
;
561 /* Nonzero enables strength-reduction in loop.c. */
563 int flag_strength_reduce
= 0;
565 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
566 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
567 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
570 int flag_unroll_loops
;
572 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
573 This is generally not a win. */
575 int flag_unroll_all_loops
;
577 /* Nonzero forces all invariant computations in loops to be moved
580 int flag_move_all_movables
= 0;
582 /* Nonzero forces all general induction variables in loops to be
585 int flag_reduce_all_givs
= 0;
587 /* Nonzero to perform full register move optimization passes. This is the
590 int flag_regmove
= 0;
592 /* Nonzero for -fwritable-strings:
593 store string constants in data segment and don't uniquize them. */
595 int flag_writable_strings
= 0;
597 /* Nonzero means don't put addresses of constant functions in registers.
598 Used for compiling the Unix kernel, where strange substitutions are
599 done on the assembly output. */
601 int flag_no_function_cse
= 0;
603 /* Nonzero for -fomit-frame-pointer:
604 don't make a frame pointer in simple functions that don't require one. */
606 int flag_omit_frame_pointer
= 0;
608 /* Nonzero means place each function into its own section on those platforms
609 which support arbitrary section names and unlimited numbers of sections. */
611 int flag_function_sections
= 0;
613 /* ... and similar for data. */
615 int flag_data_sections
= 0;
617 /* Nonzero to inhibit use of define_optimization peephole opts. */
619 int flag_no_peephole
= 0;
621 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
623 int flag_optimize_sibling_calls
= 0;
625 /* Nonzero means the front end generally wants `errno' maintained by math
626 operations, like built-in SQRT. */
628 int flag_errno_math
= 1;
630 /* Nonzero means that unsafe floating-point math optimizations are allowed
631 for the sake of speed. IEEE compliance is not guaranteed, and operations
632 are allowed to assume that their arguments and results are "normal"
633 (e.g., nonnegative for SQRT). */
635 int flag_unsafe_math_optimizations
= 0;
637 /* Zero means that floating-point math operations cannot generate a
638 (user-visible) trap. This is the case, for example, in nonstop
639 IEEE 754 arithmetic. */
641 int flag_trapping_math
= 1;
643 /* 0 means straightforward implementation of complex divide acceptable.
644 1 means wide ranges of inputs must work for complex divide.
645 2 means C99-like requirements for complex divide (not yet implemented). */
647 int flag_complex_divide_method
= 0;
649 /* Nonzero means all references through pointers are volatile. */
653 /* Nonzero means treat all global and extern variables as volatile. */
655 int flag_volatile_global
;
657 /* Nonzero means treat all static variables as volatile. */
659 int flag_volatile_static
;
661 /* Nonzero means just do syntax checking; don't output anything. */
663 int flag_syntax_only
= 0;
665 /* Nonzero means perform global cse. */
667 static int flag_gcse
;
669 /* Nonzero means to use global dataflow analysis to eliminate
670 useless null pointer tests. */
672 static int flag_delete_null_pointer_checks
;
674 /* Nonzero means to rerun cse after loop optimization. This increases
675 compilation time about 20% and picks up a few more common expressions. */
677 static int flag_rerun_cse_after_loop
;
679 /* Nonzero means to run loop optimizations twice. */
681 int flag_rerun_loop_opt
;
683 /* Nonzero for -finline-functions: ok to inline functions that look like
684 good inline candidates. */
686 int flag_inline_functions
;
688 /* Nonzero for -fkeep-inline-functions: even if we make a function
689 go inline everywhere, keep its definition around for debugging
692 int flag_keep_inline_functions
;
694 /* Nonzero means that functions will not be inlined. */
698 /* Nonzero means that we should emit static const variables
699 regardless of whether or not optimization is turned on. */
701 int flag_keep_static_consts
= 1;
703 /* Nonzero means we should be saving declaration info into a .X file. */
705 int flag_gen_aux_info
= 0;
707 /* Specified name of aux-info file. */
709 static char *aux_info_file_name
;
711 /* Nonzero means make the text shared if supported. */
713 int flag_shared_data
;
715 /* Nonzero means schedule into delayed branch slots if supported. */
717 int flag_delayed_branch
;
719 /* Nonzero if we are compiling pure (sharable) code.
720 Value is 1 if we are doing reasonable (i.e. simple
721 offset into offset table) pic. Value is 2 if we can
722 only perform register offsets. */
726 /* Nonzero means generate extra code for exception handling and enable
727 exception handling. */
731 /* Nonzero means use the new model for exception handling. Replaces
732 -DNEW_EH_MODEL as a compile option. */
734 int flag_new_exceptions
= 1;
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) \
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 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1059 "Run CSE pass after loop optimisations"},
1060 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1061 "Run the loop optimiser twice"},
1062 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1063 "Delete useless null pointer checks" },
1064 {"pretend-float", &flag_pretend_float
, 1,
1065 "Pretend that host and target use the same FP format"},
1066 {"schedule-insns", &flag_schedule_insns
, 1,
1067 "Reschedule instructions before register allocation"},
1068 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1069 "Reschedule instructions after register allocation"},
1070 {"sched-interblock",&flag_schedule_interblock
, 1,
1071 "Enable scheduling across basic blocks" },
1072 {"sched-spec",&flag_schedule_speculative
, 1,
1073 "Allow speculative motion of non-loads" },
1074 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1075 "Allow speculative motion of some loads" },
1076 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1077 "Allow speculative motion of more loads" },
1078 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1079 "Replace add,compare,branch with branch on count reg"},
1080 {"pic", &flag_pic
, 1,
1081 "Generate position independent code, if possible"},
1082 {"PIC", &flag_pic
, 2, ""},
1083 {"exceptions", &flag_exceptions
, 1,
1084 "Enable exception handling" },
1085 {"new-exceptions", &flag_new_exceptions
, 1,
1086 "Use the new model for exception handling" },
1087 {"unwind-tables", &flag_unwind_tables
, 1,
1088 "Just generate unwind tables for exception handling" },
1089 {"sjlj-exceptions", &exceptions_via_longjmp
, 1,
1090 "Use setjmp/longjmp to handle exceptions" },
1091 {"asynchronous-exceptions", &asynchronous_exceptions
, 1,
1092 "Support asynchronous 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
);
1650 #if defined (USG) || defined (hpux)
1651 /* Re-enable the signal catcher. */
1652 signal (SIGFPE
, float_signal
);
1655 signal (SIGFPE
, float_signal
);
1656 longjmp (float_handler
, 1);
1659 /* Specify where to longjmp to when a floating arithmetic error happens.
1660 If HANDLER is 0, it means don't handle the errors any more. */
1663 set_float_handler (handler
)
1666 float_handled
= (handler
!= 0);
1668 bcopy ((char *) handler
, (char *) float_handler
, sizeof (float_handler
));
1670 if (float_handled
&& ! float_handler_set
)
1672 signal (SIGFPE
, float_signal
);
1673 float_handler_set
= 1;
1677 /* This is a wrapper function for code which might elicit an
1678 arithmetic exception. That code should be passed in as a function
1679 pointer FN, and one argument DATA. DATA is usually a struct which
1680 contains the real input and output for function FN. This function
1681 returns 0 (failure) if longjmp was called (i.e. an exception
1682 occured.) It returns 1 (success) otherwise. */
1685 do_float_handler (fn
, data
)
1686 void (*fn
) PARAMS ((PTR
));
1693 /* We got here via longjmp () caused by an exception in function
1695 set_float_handler (NULL
);
1699 set_float_handler (buf
);
1701 set_float_handler (NULL
);
1705 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1706 into ICE messages, which is much more user friendly. */
1709 crash_signal (signo
)
1712 internal_error ("Internal error: %s", strsignal (signo
));
1715 /* Strip off a legitimate source ending from the input string NAME of
1716 length LEN. Rather than having to know the names used by all of
1717 our front ends, we strip off an ending of a period followed by
1718 up to five characters. (Java uses ".class".) */
1721 strip_off_ending (name
, len
)
1726 for (i
= 2; i
< 6 && len
> i
; i
++)
1728 if (name
[len
- i
] == '.')
1730 name
[len
- i
] = '\0';
1736 /* Output a quoted string. */
1739 output_quoted_string (asm_file
, string
)
1743 #ifdef OUTPUT_QUOTED_STRING
1744 OUTPUT_QUOTED_STRING (asm_file
, string
);
1748 putc ('\"', asm_file
);
1749 while ((c
= *string
++) != 0)
1751 if (c
== '\"' || c
== '\\')
1752 putc ('\\', asm_file
);
1755 putc ('\"', asm_file
);
1759 /* Output a file name in the form wanted by System V. */
1762 output_file_directive (asm_file
, input_name
)
1764 const char *input_name
;
1766 int len
= strlen (input_name
);
1767 const char *na
= input_name
+ len
;
1769 /* NA gets INPUT_NAME sans directory names. */
1770 while (na
> input_name
)
1772 if (IS_DIR_SEPARATOR (na
[-1]))
1777 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1778 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1780 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1781 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1783 fprintf (asm_file
, "\t.file\t");
1784 output_quoted_string (asm_file
, na
);
1785 fputc ('\n', asm_file
);
1790 #ifdef ASM_IDENTIFY_LANGUAGE
1791 /* Routine to build language identifier for object file. */
1794 output_lang_identify (asm_out_file
)
1797 int len
= strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1798 char *s
= (char *) alloca (len
);
1800 sprintf (s
, "__gnu_compiled_%s", lang_identify ());
1801 ASM_OUTPUT_LABEL (asm_out_file
, s
);
1805 /* Routine to open a dump file. Return true if the dump file is enabled. */
1808 open_dump_file (index
, decl
)
1809 enum dump_file_index index
;
1813 const char *open_arg
;
1816 if (! dump_file
[index
].enabled
)
1819 timevar_push (TV_DUMP
);
1820 if (rtl_dump_file
!= NULL
)
1821 fclose (rtl_dump_file
);
1823 sprintf (seq
, ".%02d.", index
);
1825 if (! dump_file
[index
].initialized
)
1827 /* If we've not initialized the files, do so now. */
1828 if (graph_dump_format
!= no_graph
1829 && dump_file
[index
].graph_dump_p
)
1831 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1832 clean_graph_dump_file (dump_base_name
, dump_name
);
1835 dump_file
[index
].initialized
= 1;
1841 dump_name
= concat (dump_base_name
, seq
,
1842 dump_file
[index
].extension
, NULL
);
1844 rtl_dump_file
= fopen (dump_name
, open_arg
);
1845 if (rtl_dump_file
== NULL
)
1846 fatal_io_error ("can't open %s", dump_name
);
1851 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1852 decl_printable_name (decl
, 2));
1854 timevar_pop (TV_DUMP
);
1858 /* Routine to close a dump file. */
1861 close_dump_file (index
, func
, insns
)
1862 enum dump_file_index index
;
1863 void (*func
) PARAMS ((FILE *, rtx
));
1866 if (! rtl_dump_file
)
1869 timevar_push (TV_DUMP
);
1871 && graph_dump_format
!= no_graph
1872 && dump_file
[index
].graph_dump_p
)
1877 sprintf (seq
, ".%02d.", index
);
1878 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1879 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1884 func (rtl_dump_file
, insns
);
1886 fflush (rtl_dump_file
);
1887 fclose (rtl_dump_file
);
1889 rtl_dump_file
= NULL
;
1890 timevar_pop (TV_DUMP
);
1893 /* Do any final processing required for the declarations in VEC, of
1894 which there are LEN. We write out inline functions and variables
1895 that have been deferred until this point, but which are required.
1896 Returns non-zero if anything was put out. */
1899 wrapup_global_declarations (vec
, len
)
1906 int output_something
= 0;
1908 for (i
= 0; i
< len
; i
++)
1912 /* We're not deferring this any longer. */
1913 DECL_DEFER_OUTPUT (decl
) = 0;
1915 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1916 && incomplete_decl_finalize_hook
!= 0)
1917 (*incomplete_decl_finalize_hook
) (decl
);
1920 /* Now emit any global variables or functions that we have been
1921 putting off. We need to loop in case one of the things emitted
1922 here references another one which comes earlier in the list. */
1926 for (i
= 0; i
< len
; i
++)
1930 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1933 /* Don't write out static consts, unless we still need them.
1935 We also keep static consts if not optimizing (for debugging),
1936 unless the user specified -fno-keep-static-consts.
1937 ??? They might be better written into the debug information.
1938 This is possible when using DWARF.
1940 A language processor that wants static constants to be always
1941 written out (even if it is not used) is responsible for
1942 calling rest_of_decl_compilation itself. E.g. the C front-end
1943 calls rest_of_decl_compilation from finish_decl.
1944 One motivation for this is that is conventional in some
1945 environments to write things like:
1946 static const char rcsid[] = "... version string ...";
1947 intending to force the string to be in the executable.
1949 A language processor that would prefer to have unneeded
1950 static constants "optimized away" would just defer writing
1951 them out until here. E.g. C++ does this, because static
1952 constants are often defined in header files.
1954 ??? A tempting alternative (for both C and C++) would be
1955 to force a constant to be written if and only if it is
1956 defined in a main file, as opposed to an include file. */
1958 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1959 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1960 && !DECL_COMDAT (decl
))
1962 && flag_keep_static_consts
1963 && !DECL_ARTIFICIAL (decl
))
1964 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1967 rest_of_decl_compilation (decl
, NULL_PTR
, 1, 1);
1970 if (TREE_CODE (decl
) == FUNCTION_DECL
1971 && DECL_INITIAL (decl
) != 0
1972 && DECL_SAVED_INSNS (decl
) != 0
1973 && (flag_keep_inline_functions
1974 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1975 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1978 output_inline_function (decl
);
1983 output_something
= 1;
1987 return output_something
;
1990 /* Issue appropriate warnings for the global declarations in VEC (of
1991 which there are LEN). Output debugging information for them. */
1994 check_global_declarations (vec
, len
)
2001 for (i
= 0; i
< len
; i
++)
2005 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2006 && ! TREE_ASM_WRITTEN (decl
))
2007 /* Cancel the RTL for this decl so that, if debugging info
2008 output for global variables is still to come,
2009 this one will be omitted. */
2010 DECL_RTL (decl
) = NULL
;
2012 /* Warn about any function
2013 declared static but not defined.
2014 We don't warn about variables,
2015 because many programs have static variables
2016 that exist only to get some text into the object file. */
2017 if (TREE_CODE (decl
) == FUNCTION_DECL
2018 && (warn_unused_function
2019 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2020 && DECL_INITIAL (decl
) == 0
2021 && DECL_EXTERNAL (decl
)
2022 && ! DECL_ARTIFICIAL (decl
)
2023 && ! TREE_PUBLIC (decl
))
2025 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2026 pedwarn_with_decl (decl
,
2027 "`%s' used but never defined");
2029 warning_with_decl (decl
,
2030 "`%s' declared `static' but never defined");
2031 /* This symbol is effectively an "extern" declaration now. */
2032 TREE_PUBLIC (decl
) = 1;
2033 assemble_external (decl
);
2036 /* Warn about static fns or vars defined but not used,
2037 but not about inline functions or static consts
2038 since defining those in header files is normal practice. */
2039 if (((warn_unused_function
2040 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2041 || (warn_unused_variable
2042 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2043 && ! DECL_IN_SYSTEM_HEADER (decl
)
2044 && ! DECL_EXTERNAL (decl
)
2045 && ! TREE_PUBLIC (decl
)
2046 && ! TREE_USED (decl
)
2047 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2048 /* The TREE_USED bit for file-scope decls
2049 is kept in the identifier, to handle multiple
2050 external decls in different scopes. */
2051 && ! TREE_USED (DECL_NAME (decl
)))
2052 warning_with_decl (decl
, "`%s' defined but not used");
2054 timevar_push (TV_SYMOUT
);
2055 #ifdef SDB_DEBUGGING_INFO
2056 /* The COFF linker can move initialized global vars to the end.
2057 And that can screw up the symbol ordering.
2058 By putting the symbols in that order to begin with,
2059 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2060 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2061 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2062 && ! DECL_EXTERNAL (decl
)
2063 && DECL_RTL (decl
) != 0)
2064 sdbout_symbol (decl
, 0);
2066 /* Output COFF information for non-global
2067 file-scope initialized variables. */
2068 if (write_symbols
== SDB_DEBUG
2069 && TREE_CODE (decl
) == VAR_DECL
2070 && DECL_INITIAL (decl
)
2071 && ! DECL_EXTERNAL (decl
)
2072 && DECL_RTL (decl
) != 0
2073 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2074 sdbout_toplevel_data (decl
);
2075 #endif /* SDB_DEBUGGING_INFO */
2076 #ifdef DWARF_DEBUGGING_INFO
2077 /* Output DWARF information for file-scope tentative data object
2078 declarations, file-scope (extern) function declarations (which
2079 had no corresponding body) and file-scope tagged type declarations
2080 and definitions which have not yet been forced out. */
2082 if (write_symbols
== DWARF_DEBUG
2083 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2084 dwarfout_file_scope_decl (decl
, 1);
2086 #ifdef DWARF2_DEBUGGING_INFO
2087 /* Output DWARF2 information for file-scope tentative data object
2088 declarations, file-scope (extern) function declarations (which
2089 had no corresponding body) and file-scope tagged type declarations
2090 and definitions which have not yet been forced out. */
2092 if (write_symbols
== DWARF2_DEBUG
2093 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2094 dwarf2out_decl (decl
);
2096 timevar_pop (TV_SYMOUT
);
2100 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2101 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2102 INPUT_FILENAME and LINENO accordingly. */
2105 push_srcloc (file
, line
)
2109 struct file_stack
*fs
;
2111 if (input_file_stack
)
2113 input_file_stack
->name
= input_filename
;
2114 input_file_stack
->line
= lineno
;
2117 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2118 fs
->name
= input_filename
= file
;
2119 fs
->line
= lineno
= line
;
2120 fs
->indent_level
= 0;
2121 fs
->next
= input_file_stack
;
2122 input_file_stack
= fs
;
2123 input_file_stack_tick
++;
2126 /* Pop the top entry off the stack of presently open source files.
2127 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2133 struct file_stack
*fs
;
2135 fs
= input_file_stack
;
2136 input_file_stack
= fs
->next
;
2138 input_file_stack_tick
++;
2139 /* The initial source file is never popped. */
2140 if (!input_file_stack
)
2142 input_filename
= input_file_stack
->name
;
2143 lineno
= input_file_stack
->line
;
2146 /* Compile an entire file of output from cpp, named NAME.
2147 Write a file of assembly output and various debugging dumps. */
2155 int name_specified
= name
!= 0;
2157 if (dump_base_name
== 0)
2158 dump_base_name
= name
? name
: "gccdump";
2163 /* Start timing total execution time. */
2166 timevar_start (TV_TOTAL
);
2168 /* Initialize data in various passes. */
2171 name
= init_parse (name
);
2172 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2173 || debug_info_level
== DINFO_LEVEL_VERBOSE
2174 || flag_test_coverage
2175 || warn_notreached
);
2178 init_decl_processing ();
2184 init_function_once ();
2185 init_stor_layout_once ();
2186 init_varasm_once ();
2187 init_EXPR_INSN_LIST_cache ();
2189 /* The following initialization functions need to generate rtl, so
2190 provide a dummy function context for them. */
2191 init_dummy_function_start ();
2194 if (flag_caller_saves
)
2195 init_caller_save ();
2196 expand_dummy_function_end ();
2198 /* If auxiliary info generation is desired, open the output file.
2199 This goes in the same directory as the source file--unlike
2200 all the other output files. */
2201 if (flag_gen_aux_info
)
2203 aux_info_file
= fopen (aux_info_file_name
, "w");
2204 if (aux_info_file
== 0)
2205 fatal_io_error ("can't open %s", aux_info_file_name
);
2208 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2209 because then the driver will have provided the name of a temporary
2210 file or bit bucket for us. */
2212 if (! name_specified
&& asm_file_name
== 0)
2213 asm_out_file
= stdout
;
2216 if (asm_file_name
== 0)
2218 int len
= strlen (dump_base_name
);
2219 char *dumpname
= (char *) xmalloc (len
+ 6);
2220 memcpy (dumpname
, dump_base_name
, len
+ 1);
2221 strip_off_ending (dumpname
, len
);
2222 strcat (dumpname
, ".s");
2223 asm_file_name
= dumpname
;
2225 if (!strcmp (asm_file_name
, "-"))
2226 asm_out_file
= stdout
;
2228 asm_out_file
= fopen (asm_file_name
, "w");
2229 if (asm_out_file
== 0)
2230 fatal_io_error ("can't open %s for writing", asm_file_name
);
2233 #ifdef IO_BUFFER_SIZE
2234 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2235 _IOFBF
, IO_BUFFER_SIZE
);
2239 name
= ggc_strdup (name
);
2241 input_filename
= name
;
2243 /* Put an entry on the input file stack for the main input file. */
2244 push_srcloc (input_filename
, 0);
2246 /* Perform language-specific initialization.
2247 This may set main_input_filename. */
2248 if (lang_hooks
.init
)
2249 (*lang_hooks
.init
) ();
2251 /* If the input doesn't start with a #line, use the input name
2252 as the official input file name. */
2253 if (main_input_filename
== 0)
2254 main_input_filename
= name
;
2256 if (flag_syntax_only
)
2258 write_symbols
= NO_DEBUG
;
2260 profile_block_flag
= 0;
2264 ASM_FILE_START (asm_out_file
);
2266 #ifdef ASM_COMMENT_START
2267 if (flag_verbose_asm
)
2269 /* Print the list of options in effect. */
2270 print_version (asm_out_file
, ASM_COMMENT_START
);
2271 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2272 ASM_COMMENT_START
, " ", "\n");
2273 /* Add a blank line here so it appears in assembler output but not
2275 fprintf (asm_out_file
, "\n");
2279 /* Output something to inform GDB that this compilation was by GCC. */
2280 #ifndef ASM_IDENTIFY_GCC
2281 fprintf (asm_out_file
, "gcc2_compiled.:\n");
2283 ASM_IDENTIFY_GCC (asm_out_file
);
2286 /* Output something to identify which front-end produced this file. */
2287 #ifdef ASM_IDENTIFY_LANGUAGE
2288 ASM_IDENTIFY_LANGUAGE (asm_out_file
);
2290 } /* ! flag_syntax_only */
2292 #ifndef ASM_OUTPUT_SECTION_NAME
2293 if (flag_function_sections
)
2295 warning ("-ffunction-sections not supported for this target.");
2296 flag_function_sections
= 0;
2298 if (flag_data_sections
)
2300 warning ("-fdata-sections not supported for this target.");
2301 flag_data_sections
= 0;
2305 if (flag_function_sections
2306 && (profile_flag
|| profile_block_flag
))
2308 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2309 flag_function_sections
= 0;
2312 #ifndef OBJECT_FORMAT_ELF
2313 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2314 warning ("-ffunction-sections may affect debugging on some targets.");
2317 /* ??? Note: There used to be a conditional here
2318 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2319 This was to guarantee separation between gcc_compiled. and
2320 the first function, for the sake of dbx on Suns.
2321 However, having the extra zero here confused the Emacs
2322 code for unexec, and might confuse other programs too.
2323 Therefore, I took out that change.
2324 In future versions we should find another way to solve
2325 that dbx problem. -- rms, 23 May 93. */
2327 /* Don't let the first function fall at the same address
2328 as gcc_compiled., if profiling. */
2329 if (profile_flag
|| profile_block_flag
)
2331 /* It's best if we can write a nop here since some
2332 assemblers don't tolerate zeros in the text section. */
2333 output_asm_insn (get_insn_template (CODE_FOR_nop
, NULL
), NULL_PTR
);
2336 /* If dbx symbol table desired, initialize writing it
2337 and output the predefined types. */
2338 timevar_push (TV_SYMOUT
);
2339 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2340 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2341 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2343 #ifdef SDB_DEBUGGING_INFO
2344 if (write_symbols
== SDB_DEBUG
)
2345 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2347 #ifdef DWARF_DEBUGGING_INFO
2348 if (write_symbols
== DWARF_DEBUG
)
2349 dwarfout_init (asm_out_file
, main_input_filename
);
2351 #ifdef DWARF2_UNWIND_INFO
2352 if (dwarf2out_do_frame ())
2353 dwarf2out_frame_init ();
2355 #ifdef DWARF2_DEBUGGING_INFO
2356 if (write_symbols
== DWARF2_DEBUG
)
2357 dwarf2out_init (asm_out_file
, main_input_filename
);
2359 timevar_pop (TV_SYMOUT
);
2361 /* Initialize yet another pass. */
2363 init_final (main_input_filename
);
2364 init_branch_prob (dump_base_name
);
2366 timevar_push (TV_PARSE
);
2368 /* Call the parser, which parses the entire file
2369 (calling rest_of_compilation for each function). */
2371 if (yyparse () != 0)
2373 if (errorcount
== 0)
2374 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2376 /* In case there were missing closebraces,
2377 get us back to the global binding level. */
2378 while (! global_bindings_p ())
2382 /* Compilation is now finished except for writing
2383 what's left of the symbol table output. */
2385 timevar_pop (TV_PARSE
);
2387 if (flag_syntax_only
)
2390 globals
= getdecls ();
2392 /* Really define vars that have had only a tentative definition.
2393 Really output inline functions that must actually be callable
2394 and have not been output so far. */
2397 int len
= list_length (globals
);
2398 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2402 /* Process the decls in reverse order--earliest first.
2403 Put them into VEC from back to front, then take out from front. */
2405 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2406 vec
[len
- i
- 1] = decl
;
2408 wrapup_global_declarations (vec
, len
);
2410 /* This must occur after the loop to output deferred functions. Else
2411 the profiler initializer would not be emitted if all the functions
2412 in this compilation unit were deferred.
2414 output_func_start_profiler can not cause any additional functions or
2415 data to need to be output, so it need not be in the deferred function
2417 output_func_start_profiler ();
2419 /* Now that all possible functions have been output, we can dump
2420 the exception table. */
2422 #ifndef IA64_UNWIND_INFO
2423 output_exception_table ();
2425 free_exception_table ();
2427 check_global_declarations (vec
, len
);
2433 /* Write out any pending weak symbol declarations. */
2437 /* Do dbx symbols. */
2438 timevar_push (TV_SYMOUT
);
2439 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2440 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2441 dbxout_finish (asm_out_file
, main_input_filename
);
2444 #ifdef DWARF_DEBUGGING_INFO
2445 if (write_symbols
== DWARF_DEBUG
)
2449 #ifdef DWARF2_UNWIND_INFO
2450 if (dwarf2out_do_frame ())
2451 dwarf2out_frame_finish ();
2454 #ifdef DWARF2_DEBUGGING_INFO
2455 if (write_symbols
== DWARF2_DEBUG
)
2456 dwarf2out_finish ();
2458 timevar_pop (TV_SYMOUT
);
2460 /* Output some stuff at end of file if nec. */
2462 end_final (dump_base_name
);
2464 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2466 timevar_push (TV_DUMP
);
2467 open_dump_file (DFI_bp
, NULL
);
2471 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2472 timevar_pop (TV_DUMP
);
2476 ASM_FILE_END (asm_out_file
);
2479 /* Language-specific end of compilation actions. */
2481 if (lang_hooks
.finish
)
2482 (*lang_hooks
.finish
) ();
2484 /* Close the dump files. */
2486 if (flag_gen_aux_info
)
2488 fclose (aux_info_file
);
2490 unlink (aux_info_file_name
);
2493 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2495 timevar_push (TV_DUMP
);
2496 dump_combine_total_stats (rtl_dump_file
);
2497 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2498 timevar_pop (TV_DUMP
);
2501 /* Close non-debugging input and output files. Take special care to note
2502 whether fclose returns an error, since the pages might still be on the
2503 buffer chain while the file is open. */
2507 if (ferror (asm_out_file
) != 0)
2508 fatal_io_error ("error writing to %s", asm_file_name
);
2509 if (fclose (asm_out_file
) != 0)
2510 fatal_io_error ("error closing %s", asm_file_name
);
2512 /* Do whatever is necessary to finish printing the graphs. */
2513 if (graph_dump_format
!= no_graph
)
2517 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2518 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2523 sprintf (seq
, ".%02d.", i
);
2524 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2525 finish_graph_dump_file (dump_base_name
, suffix
);
2532 ggc_print_statistics ();
2533 stringpool_statistics ();
2536 /* Free up memory for the benefit of leak detectors. */
2539 /* Stop timing total execution time. */
2540 timevar_stop (TV_TOTAL
);
2542 /* Print the times. */
2544 timevar_print (stderr
);
2547 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2548 and TYPE_DECL nodes.
2550 This does nothing for local (non-static) variables, unless the
2551 variable is a register variable with an ASMSPEC. In that case, or
2552 if the variable is not an automatice, it sets up the RTL and
2553 outputs any assembler code (label definition, storage allocation
2554 and initialization).
2556 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2557 the assembler symbol name to be used. TOP_LEVEL is nonzero
2558 if this declaration is not within a function. */
2561 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2563 const char *asmspec
;
2567 /* Declarations of variables, and of functions defined elsewhere. */
2569 /* The most obvious approach, to put an #ifndef around where
2570 this macro is used, doesn't work since it's inside a macro call. */
2571 #ifndef ASM_FINISH_DECLARE_OBJECT
2572 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2575 /* Forward declarations for nested functions are not "external",
2576 but we need to treat them as if they were. */
2577 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2578 || TREE_CODE (decl
) == FUNCTION_DECL
)
2580 timevar_push (TV_VARCONST
);
2581 make_decl_rtl (decl
, asmspec
);
2582 /* Don't output anything
2583 when a tentative file-scope definition is seen.
2584 But at end of compilation, do output code for them. */
2585 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2586 assemble_variable (decl
, top_level
, at_end
, 0);
2587 if (decl
== last_assemble_variable_decl
)
2589 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2592 timevar_pop (TV_VARCONST
);
2594 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2596 if (decode_reg_name (asmspec
) >= 0)
2598 DECL_RTL (decl
) = 0;
2599 make_decl_rtl (decl
, asmspec
);
2603 error ("invalid register name `%s' for register variable", asmspec
);
2604 DECL_REGISTER (decl
) = 0;
2605 make_decl_rtl (decl
, NULL
);
2608 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2609 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2610 && TREE_CODE (decl
) == TYPE_DECL
)
2612 timevar_push (TV_SYMOUT
);
2613 dbxout_symbol (decl
, 0);
2614 timevar_pop (TV_SYMOUT
);
2617 #ifdef SDB_DEBUGGING_INFO
2618 else if (write_symbols
== SDB_DEBUG
&& top_level
2619 && TREE_CODE (decl
) == TYPE_DECL
)
2621 timevar_push (TV_SYMOUT
);
2622 sdbout_symbol (decl
, 0);
2623 timevar_pop (TV_SYMOUT
);
2628 /* Called after finishing a record, union or enumeral type. */
2631 rest_of_type_compilation (type
, toplev
)
2632 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2636 tree type ATTRIBUTE_UNUSED
;
2637 int toplev ATTRIBUTE_UNUSED
;
2640 timevar_push (TV_SYMOUT
);
2641 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2642 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2643 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2645 #ifdef SDB_DEBUGGING_INFO
2646 if (write_symbols
== SDB_DEBUG
)
2647 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2649 #ifdef DWARF2_DEBUGGING_INFO
2650 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2651 dwarf2out_decl (TYPE_STUB_DECL (type
));
2653 timevar_pop (TV_SYMOUT
);
2656 /* DECL is an inline function, whose body is present, but which is not
2657 being output at this point. (We're putting that off until we need
2658 to do it.) If there are any actions that need to take place,
2659 including the emission of debugging information for the function,
2660 this is where they should go. This function may be called by
2661 language-dependent code for front-ends that do not even generate
2662 RTL for functions that don't need to be put out. */
2665 note_deferral_of_defined_inline_function (decl
)
2666 tree decl ATTRIBUTE_UNUSED
;
2668 #ifdef DWARF_DEBUGGING_INFO
2669 /* Generate the DWARF info for the "abstract" instance of a function
2670 which we may later generate inlined and/or out-of-line instances
2672 if (write_symbols
== DWARF_DEBUG
2673 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2674 && ! DECL_ABSTRACT_ORIGIN (decl
))
2676 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2677 DWARF code expects it to be set in this case. Intuitively,
2678 DECL is the function we just finished defining, so setting
2679 CURRENT_FUNCTION_DECL is sensible. */
2680 tree saved_cfd
= current_function_decl
;
2681 int was_abstract
= DECL_ABSTRACT (decl
);
2682 current_function_decl
= decl
;
2684 /* Let the DWARF code do its work. */
2685 set_decl_abstract_flags (decl
, 1);
2686 dwarfout_file_scope_decl (decl
, 0);
2688 set_decl_abstract_flags (decl
, 0);
2690 /* Reset CURRENT_FUNCTION_DECL. */
2691 current_function_decl
= saved_cfd
;
2696 /* FNDECL is an inline function which is about to be emitted out of line.
2697 Do any preparation, such as emitting abstract debug info for the inline
2698 before it gets mangled by optimization. */
2701 note_outlining_of_inline_function (fndecl
)
2702 tree fndecl ATTRIBUTE_UNUSED
;
2704 #ifdef DWARF2_DEBUGGING_INFO
2705 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2706 the abstract description of inline functions until something tries to
2707 reference them. Force it out now, before optimizations mangle the
2709 if (write_symbols
== DWARF2_DEBUG
)
2710 dwarf2out_abstract_function (fndecl
);
2714 /* This is called from finish_function (within yyparse)
2715 after each top-level definition is parsed.
2716 It is supposed to compile that function or variable
2717 and output the assembler code for it.
2718 After we return, the tree storage is freed. */
2721 rest_of_compilation (decl
)
2727 int rebuild_label_notes_after_reload
;
2728 int register_life_up_to_date
;
2730 timevar_push (TV_REST_OF_COMPILATION
);
2732 /* Now that we're out of the frontend, we shouldn't have any more
2733 CONCATs anywhere. */
2734 generating_concat_p
= 0;
2736 /* When processing delayed functions, prepare_function_start() won't
2737 have been run to re-initialize it. */
2738 cse_not_expected
= ! optimize
;
2740 /* First, make sure that NOTE_BLOCK is set correctly for each
2741 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2742 if (!cfun
->x_whole_function_mode_p
)
2745 /* Then remove any notes we don't need. That will make iterating
2746 over the instruction sequence faster, and allow the garbage
2747 collector to reclaim the memory used by the notes. */
2748 remove_unnecessary_notes ();
2750 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2751 tree in sensible shape. So, we just recalculate it here. */
2752 if (cfun
->x_whole_function_mode_p
)
2757 /* If we are reconsidering an inline function
2758 at the end of compilation, skip the stuff for making it inline. */
2760 if (DECL_SAVED_INSNS (decl
) == 0)
2766 /* If this is nested inside an inlined external function, pretend
2767 it was only declared. Since we cannot inline such functions,
2768 generating code for this one is not only not necessary but will
2769 confuse some debugging output writers. */
2770 for (parent
= DECL_CONTEXT (current_function_decl
);
2771 parent
!= NULL_TREE
;
2772 parent
= get_containing_scope (parent
))
2773 if (TREE_CODE (parent
) == FUNCTION_DECL
2774 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2776 DECL_INITIAL (decl
) = 0;
2777 goto exit_rest_of_compilation
;
2780 /* If requested, consider whether to make this function inline. */
2781 if (DECL_INLINE (decl
) || flag_inline_functions
)
2783 timevar_push (TV_INTEGRATION
);
2784 lose
= function_cannot_inline_p (decl
);
2785 timevar_pop (TV_INTEGRATION
);
2786 if (lose
|| ! optimize
)
2788 if (warn_inline
&& DECL_INLINE (decl
))
2789 warning_with_decl (decl
, lose
);
2790 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2791 /* Don't really compile an extern inline function.
2792 If we can't make it inline, pretend
2793 it was only declared. */
2794 if (DECL_EXTERNAL (decl
))
2796 DECL_INITIAL (decl
) = 0;
2797 goto exit_rest_of_compilation
;
2801 /* ??? Note that this has the effect of making it look
2802 like "inline" was specified for a function if we choose
2803 to inline it. This isn't quite right, but it's
2804 probably not worth the trouble to fix. */
2805 inlinable
= DECL_INLINE (decl
) = 1;
2808 insns
= get_insns ();
2810 /* Dump the rtl code if we are dumping rtl. */
2812 if (open_dump_file (DFI_rtl
, decl
))
2814 if (DECL_SAVED_INSNS (decl
))
2815 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2816 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2819 /* If function is inline, and we don't yet know whether to
2820 compile it by itself, defer decision till end of compilation.
2821 finish_compilation will call rest_of_compilation again
2822 for those functions that need to be output. Also defer those
2823 functions that we are supposed to defer. */
2826 || (DECL_INLINE (decl
)
2827 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2828 && ! flag_keep_inline_functions
)
2829 || DECL_EXTERNAL (decl
))))
2830 DECL_DEFER_OUTPUT (decl
) = 1;
2832 if (DECL_INLINE (decl
))
2833 /* DWARF wants seperate debugging info for abstract and
2834 concrete instances of all inline functions, including those
2835 declared inline but not inlined, and those inlined even
2836 though they weren't declared inline. Conveniently, that's
2837 what DECL_INLINE means at this point. */
2838 note_deferral_of_defined_inline_function (decl
);
2840 if (DECL_DEFER_OUTPUT (decl
))
2842 /* If -Wreturn-type, we have to do a bit of compilation. We just
2843 want to call jump_optimize to figure out whether or not we can
2844 fall off the end of the function; we do the minimum amount of
2845 work necessary to make that safe. And, we set optimize to zero
2846 to keep jump_optimize from working too hard. */
2847 if (warn_return_type
)
2849 int saved_optimize
= optimize
;
2852 find_exception_handler_labels ();
2853 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2854 !JUMP_AFTER_REGSCAN
);
2855 optimize
= saved_optimize
;
2858 current_function_nothrow
= nothrow_function_p ();
2859 if (current_function_nothrow
)
2860 /* Now we know that this can't throw; set the flag for the benefit
2861 of other functions later in this translation unit. */
2862 TREE_NOTHROW (current_function_decl
) = 1;
2864 timevar_push (TV_INTEGRATION
);
2865 save_for_inline (decl
);
2866 timevar_pop (TV_INTEGRATION
);
2867 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2868 goto exit_rest_of_compilation
;
2871 /* If specified extern inline but we aren't inlining it, we are
2872 done. This goes for anything that gets here with DECL_EXTERNAL
2873 set, not just things with DECL_INLINE. */
2874 if (DECL_EXTERNAL (decl
))
2875 goto exit_rest_of_compilation
;
2880 /* Initialize some variables used by the optimizers. */
2881 init_function_for_compilation ();
2883 if (! DECL_DEFER_OUTPUT (decl
))
2884 TREE_ASM_WRITTEN (decl
) = 1;
2886 /* Now that integrate will no longer see our rtl, we need not
2887 distinguish between the return value of this function and the
2888 return value of called functions. Also, we can remove all SETs
2889 of subregs of hard registers; they are only here because of
2891 rtx_equal_function_value_matters
= 0;
2892 purge_hard_subreg_sets (get_insns ());
2894 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2895 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2896 goto exit_rest_of_compilation
;
2898 /* Emit code to get eh context, if needed. */
2901 /* We may have potential sibling or tail recursion sites. Select one
2902 (of possibly multiple) methods of performing the call. */
2903 if (flag_optimize_sibling_calls
)
2905 timevar_push (TV_JUMP
);
2906 open_dump_file (DFI_sibling
, decl
);
2908 optimize_sibling_and_tail_recursive_calls ();
2910 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2911 timevar_pop (TV_JUMP
);
2915 /* If we are doing position-independent code generation, now
2916 is the time to output special prologues and epilogues.
2917 We do not want to do this earlier, because it just clutters
2918 up inline functions with meaningless insns. */
2923 insns
= get_insns ();
2925 /* Copy any shared structure that should not be shared. */
2926 unshare_all_rtl (current_function_decl
, insns
);
2928 #ifdef SETJMP_VIA_SAVE_AREA
2929 /* This must be performed before virutal register instantiation. */
2930 if (current_function_calls_alloca
)
2931 optimize_save_area_alloca (insns
);
2934 /* Instantiate all virtual registers. */
2935 instantiate_virtual_regs (current_function_decl
, insns
);
2937 /* Find all the EH handlers. */
2938 find_exception_handler_labels ();
2940 open_dump_file (DFI_jump
, decl
);
2942 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2943 are initialized and to compute whether control can drop off the end
2946 timevar_push (TV_JUMP
);
2947 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2948 before jump optimization switches branch directions. */
2949 expected_value_to_br_prob ();
2951 reg_scan (insns
, max_reg_num (), 0);
2952 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2953 JUMP_AFTER_REGSCAN
);
2955 timevar_pop (TV_JUMP
);
2957 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2958 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2960 close_dump_file (DFI_jump
, print_rtl
, insns
);
2961 goto exit_rest_of_compilation
;
2964 timevar_push (TV_JUMP
);
2968 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2969 cleanup_cfg (insns
);
2971 /* ??? Run if-conversion before delete_null_pointer_checks,
2972 since the later does not preserve the CFG. This should
2973 be changed -- no since converting if's that are going to
2975 timevar_push (TV_IFCVT
);
2977 timevar_pop (TV_IFCVT
);
2979 /* Try to identify useless null pointer tests and delete them. */
2980 if (flag_delete_null_pointer_checks
)
2981 delete_null_pointer_checks (insns
);
2984 /* Jump optimization, and the removal of NULL pointer checks, may
2985 have reduced the number of instructions substantially. CSE, and
2986 future passes, allocate arrays whose dimensions involve the
2987 maximum instruction UID, so if we can reduce the maximum UID
2988 we'll save big on memory. */
2989 renumber_insns (rtl_dump_file
);
2990 timevar_pop (TV_JUMP
);
2992 close_dump_file (DFI_jump
, print_rtl
, insns
);
2996 /* Perform common subexpression elimination.
2997 Nonzero value from `cse_main' means that jumps were simplified
2998 and some code may now be unreachable, so do
2999 jump optimization again. */
3003 open_dump_file (DFI_cse
, decl
);
3004 timevar_push (TV_CSE
);
3006 reg_scan (insns
, max_reg_num (), 1);
3008 if (flag_thread_jumps
)
3010 timevar_push (TV_JUMP
);
3011 thread_jumps (insns
, max_reg_num (), 1);
3012 timevar_pop (TV_JUMP
);
3015 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3017 /* If we are not running more CSE passes, then we are no longer
3018 expecting CSE to be run. But always rerun it in a cheap mode. */
3019 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3021 if (tem
|| optimize
> 1)
3023 timevar_push (TV_JUMP
);
3024 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3025 !JUMP_AFTER_REGSCAN
);
3026 timevar_pop (TV_JUMP
);
3029 /* Run this after jump optmizations remove all the unreachable code
3030 so that unreachable code will not keep values live. */
3031 delete_trivially_dead_insns (insns
, max_reg_num ());
3033 /* Try to identify useless null pointer tests and delete them. */
3034 if (flag_delete_null_pointer_checks
)
3036 timevar_push (TV_JUMP
);
3037 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3039 cleanup_cfg (insns
);
3041 delete_null_pointer_checks (insns
);
3042 timevar_pop (TV_JUMP
);
3045 /* The second pass of jump optimization is likely to have
3046 removed a bunch more instructions. */
3047 renumber_insns (rtl_dump_file
);
3049 timevar_pop (TV_CSE
);
3050 close_dump_file (DFI_cse
, print_rtl
, insns
);
3053 open_dump_file (DFI_addressof
, decl
);
3055 purge_addressof (insns
);
3056 reg_scan (insns
, max_reg_num (), 1);
3058 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3062 if (optimize
> 0 && flag_ssa
)
3064 /* Convert to SSA form. */
3066 timevar_push (TV_TO_SSA
);
3067 open_dump_file (DFI_ssa
, decl
);
3069 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3070 cleanup_cfg (insns
);
3073 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3074 timevar_pop (TV_TO_SSA
);
3076 /* The SSA implementation uses basic block numbers in its phi
3077 nodes. Thus, changing the control-flow graph or the basic
3078 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3079 may cause problems. */
3083 /* Remove dead code. */
3085 timevar_push (TV_DEAD_CODE_ELIM
);
3086 open_dump_file (DFI_dce
, decl
);
3088 insns
= get_insns ();
3089 eliminate_dead_code();
3091 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3092 timevar_pop (TV_DEAD_CODE_ELIM
);
3095 /* Convert from SSA form. */
3097 timevar_push (TV_FROM_SSA
);
3098 open_dump_file (DFI_ussa
, decl
);
3100 convert_from_ssa ();
3101 /* New registers have been created. Rescan their usage. */
3102 reg_scan (insns
, max_reg_num (), 1);
3103 /* Life analysis used in SSA adds log_links but these
3104 shouldn't be there until the flow stage, so clear
3106 clear_log_links (insns
);
3108 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3109 timevar_pop (TV_FROM_SSA
);
3114 /* Perform global cse. */
3116 if (optimize
> 0 && flag_gcse
)
3118 int save_csb
, save_cfj
;
3121 timevar_push (TV_GCSE
);
3122 open_dump_file (DFI_gcse
, decl
);
3124 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3125 cleanup_cfg (insns
);
3126 tem
= gcse_main (insns
, rtl_dump_file
);
3128 save_csb
= flag_cse_skip_blocks
;
3129 save_cfj
= flag_cse_follow_jumps
;
3130 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3132 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3134 if (flag_expensive_optimizations
)
3136 timevar_push (TV_CSE
);
3137 reg_scan (insns
, max_reg_num (), 1);
3138 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3139 timevar_pop (TV_CSE
);
3140 cse_not_expected
= !flag_rerun_cse_after_loop
;
3143 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3144 things up. Then possibly re-run CSE again. */
3148 timevar_push (TV_JUMP
);
3149 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3150 !JUMP_AFTER_REGSCAN
);
3151 timevar_pop (TV_JUMP
);
3153 if (flag_expensive_optimizations
)
3155 timevar_push (TV_CSE
);
3156 reg_scan (insns
, max_reg_num (), 1);
3157 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3158 timevar_pop (TV_CSE
);
3162 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3163 timevar_pop (TV_GCSE
);
3166 flag_cse_skip_blocks
= save_csb
;
3167 flag_cse_follow_jumps
= save_cfj
;
3170 /* Move constant computations out of loops. */
3174 timevar_push (TV_LOOP
);
3175 open_dump_file (DFI_loop
, decl
);
3177 if (flag_rerun_loop_opt
)
3179 /* We only want to perform unrolling once. */
3181 loop_optimize (insns
, rtl_dump_file
, 0);
3183 /* The first call to loop_optimize makes some instructions
3184 trivially dead. We delete those instructions now in the
3185 hope that doing so will make the heuristics in loop work
3186 better and possibly speed up compilation. */
3187 delete_trivially_dead_insns (insns
, max_reg_num ());
3189 /* The regscan pass is currently necessary as the alias
3190 analysis code depends on this information. */
3191 reg_scan (insns
, max_reg_num (), 1);
3193 loop_optimize (insns
, rtl_dump_file
,
3194 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3196 close_dump_file (DFI_loop
, print_rtl
, insns
);
3197 timevar_pop (TV_LOOP
);
3204 timevar_push (TV_CSE2
);
3205 open_dump_file (DFI_cse2
, decl
);
3207 if (flag_rerun_cse_after_loop
)
3209 /* Running another jump optimization pass before the second
3210 cse pass sometimes simplifies the RTL enough to allow
3211 the second CSE pass to do a better job. Jump_optimize can change
3212 max_reg_num so we must rerun reg_scan afterwards.
3213 ??? Rework to not call reg_scan so often. */
3214 timevar_push (TV_JUMP
);
3216 reg_scan (insns
, max_reg_num (), 0);
3217 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3218 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3220 timevar_push (TV_IFCVT
);
3222 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3223 cleanup_cfg (insns
);
3226 timevar_pop(TV_IFCVT
);
3228 timevar_pop (TV_JUMP
);
3230 reg_scan (insns
, max_reg_num (), 0);
3231 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3235 timevar_push (TV_JUMP
);
3236 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3237 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3238 timevar_pop (TV_JUMP
);
3242 if (flag_thread_jumps
)
3244 /* This pass of jump threading straightens out code
3245 that was kinked by loop optimization. */
3246 timevar_push (TV_JUMP
);
3247 reg_scan (insns
, max_reg_num (), 0);
3248 thread_jumps (insns
, max_reg_num (), 0);
3249 timevar_pop (TV_JUMP
);
3252 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3253 timevar_pop (TV_CSE2
);
3258 cse_not_expected
= 1;
3262 /* Do control and data flow analysis; wrote some of the results to
3265 timevar_push (TV_FLOW
);
3266 open_dump_file (DFI_cfg
, decl
);
3268 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3269 cleanup_cfg (insns
);
3270 check_function_return_warnings ();
3272 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3274 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3276 timevar_push (TV_BRANCH_PROB
);
3277 open_dump_file (DFI_bp
, decl
);
3281 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3282 timevar_pop (TV_BRANCH_PROB
);
3285 open_dump_file (DFI_life
, decl
);
3290 /* Discover and record the loop depth at the head of each basic
3291 block. The loop infrastructure does the real job for us. */
3292 flow_loops_find (&loops
, LOOP_TREE
);
3294 /* Estimate using heuristics if no profiling info is available. */
3295 if (flag_guess_branch_prob
)
3296 estimate_probability (&loops
);
3299 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3301 flow_loops_free (&loops
);
3303 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3304 mark_constant_function ();
3305 timevar_pop (TV_FLOW
);
3307 register_life_up_to_date
= 1;
3310 if (warn_uninitialized
|| extra_warnings
)
3312 uninitialized_vars_warning (DECL_INITIAL (decl
));
3314 setjmp_args_warning ();
3317 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3321 /* If -opt, try combining insns through substitution. */
3325 int rebuild_jump_labels_after_combine
= 0;
3327 timevar_push (TV_COMBINE
);
3328 open_dump_file (DFI_combine
, decl
);
3330 rebuild_jump_labels_after_combine
3331 = combine_instructions (insns
, max_reg_num ());
3333 /* Combining insns may have turned an indirect jump into a
3334 direct jump. Rebuid the JUMP_LABEL fields of jumping
3336 if (rebuild_jump_labels_after_combine
)
3338 timevar_push (TV_JUMP
);
3339 rebuild_jump_labels (insns
);
3340 timevar_pop (TV_JUMP
);
3342 timevar_push (TV_FLOW
);
3343 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3344 cleanup_cfg (insns
);
3346 /* Blimey. We've got to have the CFG up to date for the call to
3347 if_convert below. However, the random deletion of blocks
3348 without updating life info can wind up with Wierd Stuff in
3349 global_live_at_end. We then run sched1, which updates things
3350 properly, discovers the wierdness and aborts. */
3351 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3352 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3353 | PROP_SCAN_DEAD_CODE
);
3355 timevar_pop (TV_FLOW
);
3358 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3359 timevar_pop (TV_COMBINE
);
3364 /* Rerun if-conversion, as combine may have simplified things enough to
3365 now meet sequence length restrictions. */
3368 timevar_push (TV_IFCVT
);
3369 open_dump_file (DFI_ce
, decl
);
3375 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3376 timevar_pop (TV_IFCVT
);
3379 /* Register allocation pre-pass, to reduce number of moves
3380 necessary for two-address machines. */
3381 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3383 timevar_push (TV_REGMOVE
);
3384 open_dump_file (DFI_regmove
, decl
);
3386 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3388 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3389 timevar_pop (TV_REGMOVE
);
3394 /* Any of the several passes since flow1 will have munged register
3395 lifetime data a bit. */
3397 register_life_up_to_date
= 0;
3399 #ifdef OPTIMIZE_MODE_SWITCHING
3400 timevar_push (TV_GCSE
);
3402 if (optimize_mode_switching (NULL_PTR
))
3404 /* We did work, and so had to regenerate global life information.
3405 Take advantage of this and don't re-recompute register life
3406 information below. */
3407 register_life_up_to_date
= 1;
3410 timevar_pop (TV_GCSE
);
3413 #ifdef INSN_SCHEDULING
3415 /* Print function header into sched dump now
3416 because doing the sched analysis makes some of the dump. */
3417 if (optimize
> 0 && flag_schedule_insns
)
3419 timevar_push (TV_SCHED
);
3420 open_dump_file (DFI_sched
, decl
);
3422 /* Do control and data sched analysis,
3423 and write some of the results to dump file. */
3425 schedule_insns (rtl_dump_file
);
3427 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3428 timevar_pop (TV_SCHED
);
3432 /* Register lifetime information was updated as part of verifying
3434 register_life_up_to_date
= 1;
3438 /* Determine if the current function is a leaf before running reload
3439 since this can impact optimizations done by the prologue and
3440 epilogue thus changing register elimination offsets. */
3441 current_function_is_leaf
= leaf_function_p ();
3443 timevar_push (TV_LOCAL_ALLOC
);
3444 open_dump_file (DFI_lreg
, decl
);
3446 /* Allocate pseudo-regs that are used only within 1 basic block.
3448 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3449 jump optimizer after register allocation and reloading are finished. */
3451 if (! register_life_up_to_date
)
3452 recompute_reg_usage (insns
, ! optimize_size
);
3453 regclass (insns
, max_reg_num (), rtl_dump_file
);
3454 rebuild_label_notes_after_reload
= local_alloc ();
3456 timevar_pop (TV_LOCAL_ALLOC
);
3458 if (dump_file
[DFI_lreg
].enabled
)
3460 timevar_push (TV_DUMP
);
3462 dump_flow_info (rtl_dump_file
);
3463 dump_local_alloc (rtl_dump_file
);
3465 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3466 timevar_pop (TV_DUMP
);
3471 timevar_push (TV_GLOBAL_ALLOC
);
3472 open_dump_file (DFI_greg
, decl
);
3474 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3475 pass fixing up any insns that are invalid. */
3478 failure
= global_alloc (rtl_dump_file
);
3481 build_insn_chain (insns
);
3482 failure
= reload (insns
, 0);
3485 timevar_pop (TV_GLOBAL_ALLOC
);
3487 if (dump_file
[DFI_greg
].enabled
)
3489 timevar_push (TV_DUMP
);
3491 dump_global_regs (rtl_dump_file
);
3493 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3494 timevar_pop (TV_DUMP
);
3498 goto exit_rest_of_compilation
;
3502 open_dump_file (DFI_postreload
, decl
);
3504 /* Do a very simple CSE pass over just the hard registers. */
3507 timevar_push (TV_RELOAD_CSE_REGS
);
3508 reload_cse_regs (insns
);
3509 timevar_pop (TV_RELOAD_CSE_REGS
);
3512 /* If optimizing, then go ahead and split insns now since we are about
3513 to recompute flow information anyway. Since we can't split insns after
3514 reload, do the splitting unconditionally here to avoid gcc from losing
3522 int old_labelnum
= max_label_num ();
3524 split_all_insns (0);
3525 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3528 /* Register allocation and reloading may have turned an indirect jump into
3529 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3530 jumping instructions. */
3531 if (rebuild_label_notes_after_reload
)
3533 timevar_push (TV_JUMP
);
3535 rebuild_jump_labels (insns
);
3537 timevar_pop (TV_JUMP
);
3540 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3542 /* Re-create the death notes which were deleted during reload. */
3543 timevar_push (TV_FLOW2
);
3544 open_dump_file (DFI_flow2
, decl
);
3546 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3547 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3548 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3550 /* On some machines, the prologue and epilogue code, or parts thereof,
3551 can be represented as RTL. Doing so lets us schedule insns between
3552 it and the rest of the code and also allows delayed branch
3553 scheduling to operate in the epilogue. */
3554 thread_prologue_and_epilogue_insns (insns
);
3558 cleanup_cfg (insns
);
3559 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3561 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3562 even for machines with possibly nonzero RETURN_POPS_ARGS
3563 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3564 push instructions will have popping returns. */
3565 #ifndef PUSH_ROUNDING
3566 if (!ACCUMULATE_OUTGOING_ARGS
)
3568 combine_stack_adjustments ();
3573 flow2_completed
= 1;
3575 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3576 timevar_pop (TV_FLOW2
);
3578 #ifdef HAVE_peephole2
3579 if (optimize
> 0 && flag_peephole2
)
3581 timevar_push (TV_PEEPHOLE2
);
3582 open_dump_file (DFI_peephole2
, decl
);
3584 peephole2_optimize (rtl_dump_file
);
3586 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3587 timevar_pop (TV_PEEPHOLE2
);
3591 if (optimize
> 0 && flag_rename_registers
)
3593 timevar_push (TV_RENAME_REGISTERS
);
3594 open_dump_file (DFI_rnreg
, decl
);
3596 regrename_optimize ();
3598 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3599 timevar_pop (TV_RENAME_REGISTERS
);
3604 timevar_push (TV_IFCVT2
);
3605 open_dump_file (DFI_ce2
, decl
);
3609 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3610 timevar_pop (TV_IFCVT2
);
3613 #ifdef INSN_SCHEDULING
3614 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3616 timevar_push (TV_SCHED2
);
3617 open_dump_file (DFI_sched2
, decl
);
3619 /* Do control and data sched analysis again,
3620 and write some more of the results to dump file. */
3622 schedule_insns (rtl_dump_file
);
3624 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3625 timevar_pop (TV_SCHED2
);
3631 #ifdef LEAF_REGISTERS
3632 current_function_uses_only_leaf_regs
3633 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3636 if (optimize
> 0 && flag_reorder_blocks
)
3638 timevar_push (TV_REORDER_BLOCKS
);
3639 open_dump_file (DFI_bbro
, decl
);
3641 reorder_basic_blocks ();
3643 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3644 timevar_pop (TV_REORDER_BLOCKS
);
3647 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3648 Also do cross-jumping this time and delete no-op move insns. */
3652 timevar_push (TV_JUMP
);
3653 open_dump_file (DFI_jump2
, decl
);
3655 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3656 !JUMP_AFTER_REGSCAN
);
3658 /* CFG no longer kept up to date. */
3660 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3661 timevar_pop (TV_JUMP
);
3664 /* If a machine dependent reorganization is needed, call it. */
3665 #ifdef MACHINE_DEPENDENT_REORG
3666 open_dump_file (DFI_mach
, decl
);
3668 MACHINE_DEPENDENT_REORG (insns
);
3670 close_dump_file (DFI_mach
, print_rtl
, insns
);
3675 /* If a scheduling pass for delayed branches is to be done,
3676 call the scheduling code. */
3679 if (optimize
> 0 && flag_delayed_branch
)
3681 timevar_push (TV_DBR_SCHED
);
3682 open_dump_file (DFI_dbr
, decl
);
3684 dbr_schedule (insns
, rtl_dump_file
);
3686 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3687 timevar_pop (TV_DBR_SCHED
);
3693 /* Shorten branches.
3695 Note this must run before reg-stack because of death note (ab)use
3696 in the ia32 backend. */
3697 timevar_push (TV_SHORTEN_BRANCH
);
3698 shorten_branches (get_insns ());
3699 timevar_pop (TV_SHORTEN_BRANCH
);
3702 timevar_push (TV_REG_STACK
);
3703 open_dump_file (DFI_stack
, decl
);
3705 reg_to_stack (insns
, rtl_dump_file
);
3707 close_dump_file (DFI_stack
, print_rtl
, insns
);
3708 timevar_pop (TV_REG_STACK
);
3713 current_function_nothrow
= nothrow_function_p ();
3714 if (current_function_nothrow
)
3715 /* Now we know that this can't throw; set the flag for the benefit
3716 of other functions later in this translation unit. */
3717 TREE_NOTHROW (current_function_decl
) = 1;
3719 /* Now turn the rtl into assembler code. */
3721 timevar_push (TV_FINAL
);
3726 /* Get the function's name, as described by its RTL. This may be
3727 different from the DECL_NAME name used in the source file. */
3729 x
= DECL_RTL (decl
);
3730 if (GET_CODE (x
) != MEM
)
3733 if (GET_CODE (x
) != SYMBOL_REF
)
3735 fnname
= XSTR (x
, 0);
3737 assemble_start_function (decl
, fnname
);
3738 final_start_function (insns
, asm_out_file
, optimize
);
3739 final (insns
, asm_out_file
, optimize
, 0);
3740 final_end_function (insns
, asm_out_file
, optimize
);
3741 assemble_end_function (decl
, fnname
);
3743 fflush (asm_out_file
);
3745 /* Release all memory allocated by flow. */
3746 free_basic_block_vars (0);
3748 /* Release all memory held by regsets now. */
3749 regset_release_memory ();
3751 timevar_pop (TV_FINAL
);
3755 /* Write DBX symbols if requested. */
3757 /* Note that for those inline functions where we don't initially
3758 know for certain that we will be generating an out-of-line copy,
3759 the first invocation of this routine (rest_of_compilation) will
3760 skip over this code by doing a `goto exit_rest_of_compilation;'.
3761 Later on, finish_compilation will call rest_of_compilation again
3762 for those inline functions that need to have out-of-line copies
3763 generated. During that call, we *will* be routed past here. */
3765 timevar_push (TV_SYMOUT
);
3766 #ifdef DBX_DEBUGGING_INFO
3767 if (write_symbols
== DBX_DEBUG
)
3768 dbxout_function (decl
);
3771 #ifdef DWARF_DEBUGGING_INFO
3772 if (write_symbols
== DWARF_DEBUG
)
3773 dwarfout_file_scope_decl (decl
, 0);
3776 #ifdef DWARF2_DEBUGGING_INFO
3777 if (write_symbols
== DWARF2_DEBUG
)
3778 dwarf2out_decl (decl
);
3780 timevar_pop (TV_SYMOUT
);
3782 exit_rest_of_compilation
:
3784 /* In case the function was not output,
3785 don't leave any temporary anonymous types
3786 queued up for sdb output. */
3787 #ifdef SDB_DEBUGGING_INFO
3788 if (write_symbols
== SDB_DEBUG
)
3789 sdbout_types (NULL_TREE
);
3792 reload_completed
= 0;
3793 flow2_completed
= 0;
3796 timevar_push (TV_FINAL
);
3798 /* Clear out the insn_length contents now that they are no
3800 init_insn_lengths ();
3802 /* Clear out the real_constant_chain before some of the rtx's
3803 it runs through become garbage. */
3804 clear_const_double_mem ();
3806 /* Show no temporary slots allocated. */
3809 free_basic_block_vars (0);
3811 timevar_pop (TV_FINAL
);
3813 /* Make sure volatile mem refs aren't considered valid operands for
3814 arithmetic insns. We must call this here if this is a nested inline
3815 function, since the above code leaves us in the init_recog state
3816 (from final.c), and the function context push/pop code does not
3817 save/restore volatile_ok.
3819 ??? Maybe it isn't necessary for expand_start_function to call this
3820 anymore if we do it here? */
3822 init_recog_no_volatile ();
3824 /* We're done with this function. Free up memory if we can. */
3825 free_after_parsing (cfun
);
3826 if (! DECL_DEFER_OUTPUT (decl
))
3827 free_after_compilation (cfun
);
3832 timevar_pop (TV_REST_OF_COMPILATION
);
3842 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3843 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3844 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3845 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3846 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3847 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"));
3849 for (i
= ARRAY_SIZE (f_options
); i
--;)
3851 const char *description
= f_options
[i
].description
;
3853 if (description
!= NULL
&& * description
!= 0)
3854 printf (" -f%-21s %s\n",
3855 f_options
[i
].string
, description
);
3858 printf (_(" -O[number] Set optimisation level to [number]\n"));
3859 printf (_(" -Os Optimise for space rather than speed\n"));
3860 printf (_(" --param <name>=<value> Set constant controlling optimization\n"));
3861 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3862 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3863 printf (_(" -w Suppress warnings\n"));
3864 printf (_(" -W Enable extra warnings\n"));
3866 for (i
= ARRAY_SIZE (W_options
); i
--;)
3868 const char *description
= W_options
[i
].description
;
3870 if (description
!= NULL
&& * description
!= 0)
3871 printf (" -W%-21s %s\n",
3872 W_options
[i
].string
, description
);
3875 printf (_(" -Wunused Enable unused warnings\n"));
3876 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3877 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3878 printf (_(" -p Enable function profiling\n"));
3879 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3880 printf (_(" -a Enable block profiling \n"));
3882 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3883 printf (_(" -ax Enable jump profiling \n"));
3885 printf (_(" -o <file> Place output into <file> \n"));
3887 -G <number> Put global and static data smaller than <number>\n\
3888 bytes into a special section (on some targets)\n"));
3890 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3892 if (debug_args
[i
].description
!= NULL
)
3893 printf (" -g%-21s %s\n",
3894 debug_args
[i
].arg
, debug_args
[i
].description
);
3897 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3898 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3899 printf (_(" -version Display the compiler's version\n"));
3900 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3901 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3902 #if defined INSN_SCHEDULING
3903 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3905 printf (_(" --help Display this information\n"));
3910 /* Display descriptions of language specific options.
3911 If there is no description, note that there is an undocumented option.
3912 If the description is empty, do not display anything. (This allows
3913 options to be deliberately undocumented, for whatever reason).
3914 If the option string is missing, then this is a marker, indicating
3915 that the description string is in fact the name of a language, whose
3916 language specific options are to follow. */
3918 if (ARRAY_SIZE (documented_lang_options
) > 1)
3920 printf (_("\nLanguage specific options:\n"));
3922 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3924 const char *description
= documented_lang_options
[i
].description
;
3925 const char *option
= documented_lang_options
[i
].option
;
3927 if (description
== NULL
)
3932 printf (_(" %-23.23s [undocumented]\n"), option
);
3934 else if (*description
== 0)
3936 else if (option
== NULL
)
3940 (_("\nThere are undocumented %s specific options as well.\n"),
3944 printf (_("\n Options for %s:\n"), description
);
3949 printf (" %-23.23s %s\n", option
, description
);
3954 printf (_("\nThere are undocumented %s specific options as well.\n"),
3957 display_target_options ();
3961 display_target_options ()
3965 if (ARRAY_SIZE (target_switches
) > 1
3966 #ifdef TARGET_OPTIONS
3967 || ARRAY_SIZE (target_options
) > 1
3975 printf (_("\nTarget specific options:\n"));
3977 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3979 const char *option
= target_switches
[i
].name
;
3980 const char *description
= target_switches
[i
].description
;
3982 if (option
== NULL
|| *option
== 0)
3984 else if (description
== NULL
)
3989 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3991 else if (* description
!= 0)
3992 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3995 #ifdef TARGET_OPTIONS
3996 for (i
= ARRAY_SIZE (target_options
); i
--;)
3998 const char *option
= target_options
[i
].prefix
;
3999 const char *description
= target_options
[i
].description
;
4001 if (option
== NULL
|| *option
== 0)
4003 else if (description
== NULL
)
4008 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4010 else if (* description
!= 0)
4011 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
4017 printf (_("\nThere are undocumented target specific options as well.\n"));
4019 printf (_(" They exist, but they are not documented.\n"));
4024 /* Parse a -d... comand line switch. */
4027 decode_d_option (arg
)
4036 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4037 dump_file
[i
].enabled
= 1;
4046 flag_print_asm_name
= 1;
4049 flag_dump_rtl_in_asm
= 1;
4050 flag_print_asm_name
= 1;
4053 graph_dump_format
= vcg
;
4056 rtl_dump_and_exit
= 1;
4061 case 'D': /* These are handled by the preprocessor. */
4067 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4068 if (c
== dump_file
[i
].debug_switch
)
4070 dump_file
[i
].enabled
= 1;
4075 warning ("unrecognized gcc debugging option: %c", c
);
4080 /* Parse a -f... comand line switch. ARG is the value after the -f.
4081 It is safe to access 'ARG - 2' to generate the full switch name.
4082 Return the number of strings consumed. */
4085 decode_f_option (arg
)
4089 const char *option_value
= NULL
;
4091 /* Search for the option in the table of binary f options. */
4092 for (j
= ARRAY_SIZE (f_options
); j
--;)
4094 if (!strcmp (arg
, f_options
[j
].string
))
4096 *f_options
[j
].variable
= f_options
[j
].on_value
;
4100 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4101 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4103 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4108 if (!strcmp (arg
, "fast-math"))
4109 set_fast_math_flags();
4110 else if (!strcmp (arg
, "no-fast-math"))
4111 set_no_fast_math_flags();
4112 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4113 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4116 read_integral_parameter (option_value
, arg
- 2,
4118 set_param_value ("max-inline-insns", val
);
4120 #ifdef INSN_SCHEDULING
4121 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4122 fix_sched_param ("verbose", option_value
);
4124 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4125 fix_register (option_value
, 1, 1);
4126 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4127 fix_register (option_value
, 0, 1);
4128 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4129 fix_register (option_value
, 0, 0);
4130 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4131 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4132 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4134 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4135 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4136 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4137 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4139 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4140 else if ((option_value
4141 = skip_leading_substring (arg
, "stack-limit-register=")))
4143 int reg
= decode_reg_name (option_value
);
4145 error ("unrecognized register name `%s'", option_value
);
4147 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4149 else if ((option_value
4150 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4153 nm
= ggc_strdup (option_value
);
4154 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4156 else if ((option_value
4157 = skip_leading_substring (arg
, "message-length=")))
4158 diagnostic_message_length_per_line
=
4159 read_integral_parameter (option_value
, arg
- 2,
4160 diagnostic_message_length_per_line
);
4161 else if ((option_value
4162 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4164 if (!strcmp (option_value
, "once"))
4165 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4166 else if (!strcmp (option_value
, "every-line"))
4167 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4169 error ("Unrecognized option `%s'", arg
- 2);
4171 else if (!strcmp (arg
, "no-stack-limit"))
4172 stack_limit_rtx
= NULL_RTX
;
4173 else if (!strcmp (arg
, "preprocessed"))
4174 /* Recognise this switch but do nothing. This prevents warnings
4175 about an unrecognized switch if cpplib has not been linked in. */
4183 /* Parse a -W... comand line switch. ARG is the value after the -W.
4184 It is safe to access 'ARG - 2' to generate the full switch name.
4185 Return the number of strings consumed. */
4188 decode_W_option (arg
)
4191 const char *option_value
= NULL
;
4194 /* Search for the option in the table of binary W options. */
4196 for (j
= ARRAY_SIZE (W_options
); j
--;)
4198 if (!strcmp (arg
, W_options
[j
].string
))
4200 *W_options
[j
].variable
= W_options
[j
].on_value
;
4204 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4205 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4207 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4212 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4214 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4216 if (id_clash_len
!= -1)
4219 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4221 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4223 warn_larger_than
= larger_than_size
!= -1;
4225 else if (!strcmp (arg
, "unused"))
4229 else if (!strcmp (arg
, "no-unused"))
4239 /* Parse a -g... comand line switch. ARG is the value after the -g.
4240 It is safe to access 'ARG - 2' to generate the full switch name.
4241 Return the number of strings consumed. */
4244 decode_g_option (arg
)
4248 /* A lot of code assumes write_symbols == NO_DEBUG if the
4249 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4250 of what debugging type has been selected). This records the
4251 selected type. It is an error to specify more than one
4253 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4254 /* Non-zero if debugging format has been explicitly set.
4255 -g and -ggdb don't explicitly set the debugging format so
4256 -gdwarf -g3 is equivalent to -gdwarf3. */
4257 static int type_explicitly_set_p
= 0;
4258 /* Indexed by enum debug_info_type. */
4259 static const char *debug_type_names
[] =
4261 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4264 /* The maximum admissible debug level value. */
4265 static const unsigned max_debug_level
= 3;
4267 /* Look up ARG in the table. */
4268 for (da
= debug_args
; da
->arg
; da
++)
4270 const int da_len
= strlen (da
->arg
);
4272 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4274 enum debug_info_type type
= da
->debug_type
;
4275 const char *p
= arg
+ da_len
;
4277 if (*p
&& (*p
< '0' || *p
> '9'))
4280 /* A debug flag without a level defaults to level 2.
4281 Note we do not want to call read_integral_parameter
4282 for that case since it will call atoi which
4285 ??? We may want to generalize the interface to
4286 read_integral_parameter to better handle this case
4287 if this case shows up often. */
4289 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4293 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4295 error ("use -gdwarf -g%d for DWARF v1, level %d",
4298 error ("use -gdwarf-2 for DWARF v2");
4301 if (level
> max_debug_level
)
4304 ignoring option `%s' due to invalid debug level specification",
4306 level
= debug_info_level
;
4309 if (type
== NO_DEBUG
)
4311 type
= PREFERRED_DEBUGGING_TYPE
;
4313 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4315 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4316 type
= DWARF2_DEBUG
;
4318 #ifdef DBX_DEBUGGING_INFO
4325 if (type
== NO_DEBUG
)
4326 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4328 /* Does it conflict with an already selected type? */
4329 if (type_explicitly_set_p
4330 /* -g/-ggdb don't conflict with anything. */
4331 && da
->debug_type
!= NO_DEBUG
4332 && type
!= selected_debug_type
)
4333 warning ("`%s' ignored, conflicts with `-g%s'",
4334 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4337 /* If the format has already been set, -g/-ggdb
4338 only change the debug level. */
4339 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4340 /* Don't change debugging type. */
4344 selected_debug_type
= type
;
4345 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4348 write_symbols
= (level
== 0
4350 : selected_debug_type
);
4351 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4352 debug_info_level
= (enum debug_info_level
) level
;
4365 /* Decode the first argument in the argv as a language-independent option.
4366 Return the number of strings consumed. */
4369 independent_decode_option (argc
, argv
)
4373 char *arg
= argv
[0];
4375 if (arg
[0] != '-' || arg
[1] == 0)
4387 if (!strcmp (arg
, "-help"))
4390 exit_after_options
= 1;
4393 if (!strcmp (arg
, "-target-help"))
4395 display_target_options ();
4396 exit_after_options
= 1;
4399 if (!strcmp (arg
, "-version"))
4401 print_version (stderr
, "");
4402 exit_after_options
= 1;
4405 /* Handle '--param <name>=<value>'. */
4406 if (strcmp (arg
, "-param") == 0)
4412 error ("-param option missing argument");
4416 /* Get the '<name>=<value>' parameter. */
4418 /* Look for the `='. */
4419 equal
= strchr (arg
, '=');
4421 error ("invalid --param option: %s", arg
);
4426 /* Zero out the `=' sign so that we get two separate strings. */
4428 /* Figure out what value is specified. */
4429 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4430 if (val
!= INVALID_PARAM_VAL
)
4431 set_param_value (arg
, val
);
4433 error ("invalid parameter value `%s'", equal
+ 1);
4448 /* Already been treated in main (). Do nothing. */
4452 set_target_switch (arg
+ 1);
4456 return decode_f_option (arg
+ 1);
4459 return decode_g_option (arg
+ 1);
4462 if (!strcmp (arg
, "dumpbase"))
4467 dump_base_name
= argv
[1];
4471 decode_d_option (arg
+ 1);
4475 if (!strcmp (arg
, "pedantic"))
4477 else if (!strcmp (arg
, "pedantic-errors"))
4478 flag_pedantic_errors
= pedantic
= 1;
4479 else if (arg
[1] == 0)
4486 if (!strcmp (arg
, "quiet"))
4493 if (!strcmp (arg
, "version"))
4501 inhibit_warnings
= 1;
4510 /* We save the value of warn_uninitialized, since if they put
4511 -Wuninitialized on the command line, we need to generate a
4512 warning about not using it without also specifying -O. */
4513 if (warn_uninitialized
!= 1)
4514 warn_uninitialized
= 2;
4517 return decode_W_option (arg
+ 1);
4523 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4524 warning ("`-a' option (basic block profile) not supported");
4526 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4529 else if (!strcmp (arg
, "ax"))
4531 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4532 warning ("`-ax' option (jump profiling) not supported");
4534 profile_block_flag
= (!profile_block_flag
4535 || profile_block_flag
== 2) ? 2 : 3;
4538 else if (!strncmp (arg
, "aux-info", 8))
4540 flag_gen_aux_info
= 1;
4546 aux_info_file_name
= argv
[1];
4550 aux_info_file_name
= arg
+ 8;
4562 asm_file_name
= argv
[1];
4577 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4582 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4586 if (g_switch_val
== -1)
4590 g_switch_set
= TRUE
;
4591 g_switch_value
= g_switch_val
;
4601 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4602 Decode command args, then call compile_file.
4603 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4604 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4606 It is not safe to call this function more than once. */
4609 toplev_main (argc
, argv
)
4616 /* save in case md file wants to emit args as a comment. */
4620 p
= argv
[0] + strlen (argv
[0]);
4621 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4625 xmalloc_set_program_name (progname
);
4627 /* LC_CTYPE determines the character set used by the terminal so it has be set
4628 to output messages correctly. */
4630 #ifdef HAVE_LC_MESSAGES
4631 setlocale (LC_CTYPE
, "");
4632 setlocale (LC_MESSAGES
, "");
4634 setlocale (LC_ALL
, "");
4637 (void) bindtextdomain (PACKAGE
, localedir
);
4638 (void) textdomain (PACKAGE
);
4640 /* Install handler for SIGFPE, which may be received while we do
4641 compile-time floating point arithmetic. */
4642 signal (SIGFPE
, float_signal
);
4644 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4646 signal (SIGSEGV
, crash_signal
);
4649 signal (SIGILL
, crash_signal
);
4652 signal (SIGBUS
, crash_signal
);
4655 signal (SIGABRT
, crash_signal
);
4657 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4658 signal (SIGIOT
, crash_signal
);
4661 decl_printable_name
= decl_name
;
4662 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4664 /* Initialize whether `char' is signed. */
4665 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4666 #ifdef DEFAULT_SHORT_ENUMS
4667 /* Initialize how much space enums occupy, by default. */
4668 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4671 /* Initialize the garbage-collector. */
4674 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4675 ggc_add_tree_root (¤t_function_decl
, 1);
4676 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4678 /* Initialize the diagnostics reporting machinery. */
4679 initialize_diagnostics ();
4681 /* Register the language-independent parameters. */
4682 add_params (lang_independent_params
, LAST_PARAM
);
4684 /* Perform language-specific options intialization. */
4685 if (lang_hooks
.init_options
)
4686 (*lang_hooks
.init_options
) ();
4688 /* Scan to see what optimization level has been specified. That will
4689 determine the default value of many flags. */
4690 for (i
= 1; i
< argc
; i
++)
4692 if (!strcmp (argv
[i
], "-O"))
4697 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4699 /* Handle -Os, -O2, -O3, -O69, ... */
4700 char *p
= &argv
[i
][2];
4702 if ((p
[0] == 's') && (p
[1] == 0))
4706 /* Optimizing for size forces optimize to be 2. */
4711 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4712 if (optimize_val
!= -1)
4714 optimize
= optimize_val
;
4724 flag_thread_jumps
= 1;
4726 flag_delayed_branch
= 1;
4728 #ifdef CAN_DEBUG_WITHOUT_FP
4729 flag_omit_frame_pointer
= 1;
4731 flag_guess_branch_prob
= 1;
4736 flag_optimize_sibling_calls
= 1;
4737 flag_cse_follow_jumps
= 1;
4738 flag_cse_skip_blocks
= 1;
4740 flag_expensive_optimizations
= 1;
4741 flag_strength_reduce
= 1;
4742 flag_rerun_cse_after_loop
= 1;
4743 flag_rerun_loop_opt
= 1;
4744 flag_caller_saves
= 1;
4747 #ifdef INSN_SCHEDULING
4748 flag_schedule_insns
= 1;
4749 flag_schedule_insns_after_reload
= 1;
4752 flag_strict_aliasing
= 1;
4753 flag_delete_null_pointer_checks
= 1;
4754 flag_reorder_blocks
= 1;
4759 flag_inline_functions
= 1;
4760 flag_rename_registers
= 1;
4763 if (optimize
< 2 || optimize_size
)
4768 align_functions
= 1;
4771 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4774 set_target_switch ("");
4776 /* Unwind tables are always present in an ABI-conformant IA-64
4777 object file, so the default should be ON. */
4778 #ifdef IA64_UNWIND_INFO
4779 flag_unwind_tables
= IA64_UNWIND_INFO
;
4782 #ifdef OPTIMIZATION_OPTIONS
4783 /* Allow default optimizations to be specified on a per-machine basis. */
4784 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4787 /* Initialize register usage now so switches may override. */
4790 /* Perform normal command line switch decoding. */
4791 for (i
= 1; i
< argc
;)
4793 unsigned int lang_processed
;
4794 unsigned int indep_processed
;
4796 /* Give the language a chance to decode the option for itself. */
4797 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4799 /* Now see if the option also has a language independent meaning.
4800 Some options are both language specific and language independent,
4802 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4804 if (lang_processed
|| indep_processed
)
4805 i
+= MAX (lang_processed
, indep_processed
);
4808 const char *option
= NULL
;
4809 const char *lang
= NULL
;
4812 /* It is possible that the command line switch is not valid for the
4813 current language, but it is valid for another language. In order
4814 to be compatible with previous versions of the compiler (which
4815 did not issue an error message in this case) we check for this
4816 possibility here. If we do find a match, then if extra_warnings
4817 is set we generate a warning message, otherwise we will just
4818 ignore the option. */
4819 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4821 option
= documented_lang_options
[j
].option
;
4824 lang
= documented_lang_options
[j
].description
;
4825 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4829 if (j
!= ARRAY_SIZE (documented_lang_options
))
4833 warning ("Ignoring command line option '%s'", argv
[i
]);
4836 ("(It is valid for %s but not the selected language)",
4840 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4841 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4843 error ("Unrecognized option `%s'", argv
[i
]);
4849 /* All command line options have been processed. */
4850 if (lang_hooks
.post_options
)
4851 (*lang_hooks
.post_options
) ();
4853 if (exit_after_options
)
4856 /* Reflect any language-specific diagnostic option setting. */
4857 reshape_diagnostic_buffer ();
4859 /* Checker uses the frame pointer. */
4860 if (flag_check_memory_usage
)
4861 flag_omit_frame_pointer
= 0;
4865 /* Inlining does not work if not optimizing,
4866 so force it not to be done. */
4870 /* The c_decode_option function and decode_option hook set
4871 this to `2' if -Wall is used, so we can avoid giving out
4872 lots of errors for people who don't realize what -Wall does. */
4873 if (warn_uninitialized
== 1)
4874 warning ("-Wuninitialized is not supported without -O");
4877 #ifdef OVERRIDE_OPTIONS
4878 /* Some machines may reject certain combinations of options. */
4882 if (exceptions_via_longjmp
== 2)
4884 #ifdef DWARF2_UNWIND_INFO
4885 exceptions_via_longjmp
= ! DWARF2_UNWIND_INFO
;
4887 #ifdef IA64_UNWIND_INFO
4888 exceptions_via_longjmp
= ! IA64_UNWIND_INFO
;
4890 exceptions_via_longjmp
= 1;
4895 /* Since each function gets its own handler data, we can't support the
4896 new model currently, since it depend on a specific rethrow label
4897 which is declared at the front of the table, and we can only
4898 have one such symbol in a file. */
4899 #ifdef IA64_UNWIND_INFO
4900 flag_new_exceptions
= 0;
4903 /* Set up the align_*_log variables, defaulting them to 1 if they
4904 were still unset. */
4905 if (align_loops
<= 0) align_loops
= 1;
4906 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4907 if (align_jumps
<= 0) align_jumps
= 1;
4908 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4909 if (align_labels
<= 0) align_labels
= 1;
4910 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4911 if (align_functions
<= 0) align_functions
= 1;
4912 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4914 if (profile_block_flag
== 3)
4916 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4917 profile_block_flag
= 2;
4920 /* Unrolling all loops implies that standard loop unrolling must also
4922 if (flag_unroll_all_loops
)
4923 flag_unroll_loops
= 1;
4924 /* Loop unrolling requires that strength_reduction be on also. Silently
4925 turn on strength reduction here if it isn't already on. Also, the loop
4926 unrolling code assumes that cse will be run after loop, so that must
4927 be turned on also. */
4928 if (flag_unroll_loops
)
4930 flag_strength_reduce
= 1;
4931 flag_rerun_cse_after_loop
= 1;
4934 /* Warn about options that are not supported on this machine. */
4935 #ifndef INSN_SCHEDULING
4936 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4937 warning ("instruction scheduling not supported on this target machine");
4940 if (flag_delayed_branch
)
4941 warning ("this target machine does not have delayed branches");
4944 user_label_prefix
= USER_LABEL_PREFIX
;
4945 if (flag_leading_underscore
!= -1)
4947 /* If the default prefix is more complicated than "" or "_",
4948 issue a warning and ignore this option. */
4949 if (user_label_prefix
[0] == 0 ||
4950 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4952 user_label_prefix
= flag_leading_underscore
? "_" : "";
4955 warning ("-f%sleading-underscore not supported on this target machine",
4956 flag_leading_underscore
? "" : "no-");
4959 /* If we are in verbose mode, write out the version and maybe all the
4960 option flags in use. */
4963 print_version (stderr
, "");
4965 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4968 compile_file (filename
);
4970 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4973 char *lim
= (char *) sbrk (0);
4975 fnotice (stderr
, "Data size %ld.\n", (long) (lim
- (char *) &environ
));
4980 system ("ps -l 1>&2");
4983 #endif /* not USG */
4986 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4989 return (FATAL_EXIT_CODE
);
4991 return (FATAL_EXIT_CODE
);
4992 return (SUCCESS_EXIT_CODE
);
4995 /* Decode -m switches. */
4996 /* Decode the switch -mNAME. */
4999 set_target_switch (name
)
5003 int valid_target_option
= 0;
5005 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5006 if (!strcmp (target_switches
[j
].name
, name
))
5008 if (target_switches
[j
].value
< 0)
5009 target_flags
&= ~-target_switches
[j
].value
;
5011 target_flags
|= target_switches
[j
].value
;
5012 valid_target_option
= 1;
5015 #ifdef TARGET_OPTIONS
5016 if (!valid_target_option
)
5017 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5019 int len
= strlen (target_options
[j
].prefix
);
5020 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5022 *target_options
[j
].variable
= name
+ len
;
5023 valid_target_option
= 1;
5028 if (!valid_target_option
)
5029 error ("Invalid option `%s'", name
);
5032 /* Print version information to FILE.
5033 Each line begins with INDENT (for the case where FILE is the
5034 assembler output file). */
5037 print_version (file
, indent
)
5042 #define __VERSION__ "[?]"
5046 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5048 "%s%s%s version %s (%s) compiled by CC.\n"
5050 , indent
, *indent
!= 0 ? " " : "",
5051 language_string
, version_string
, TARGET_NAME
,
5052 indent
, __VERSION__
);
5055 /* Print an option value and return the adjusted position in the line.
5056 ??? We don't handle error returns from fprintf (disk full); presumably
5057 other code will catch a disk full though. */
5060 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5063 const char *indent
, *sep
, *term
, *type
, *name
;
5065 /* The ultrix fprintf returns 0 on success, so compute the result we want
5066 here since we need it for the following test. */
5067 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5072 fprintf (file
, "%s", term
);
5077 fprintf (file
, "%s", indent
);
5078 pos
= strlen (indent
);
5080 fprintf (file
, "%s%s%s", sep
, type
, name
);
5085 /* Print active target switches to FILE.
5086 POS is the current cursor position and MAX is the size of a "line".
5087 Each line begins with INDENT and ends with TERM.
5088 Each switch is separated from the next by SEP. */
5091 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5094 const char *indent
, *sep
, *term
;
5099 /* Print the options as passed. */
5101 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5102 _("options passed: "), "");
5104 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5108 if (strcmp (*p
, "-o") == 0)
5114 if (strcmp (*p
, "-quiet") == 0)
5116 if (strcmp (*p
, "-version") == 0)
5121 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5124 fprintf (file
, "%s", term
);
5126 /* Print the -f and -m options that have been enabled.
5127 We don't handle language specific options but printing argv
5130 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5131 _("options enabled: "), "");
5133 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5134 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5135 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5136 "-f", f_options
[j
].string
);
5138 /* Print target specific options. */
5140 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5141 if (target_switches
[j
].name
[0] != '\0'
5142 && target_switches
[j
].value
> 0
5143 && ((target_switches
[j
].value
& target_flags
)
5144 == target_switches
[j
].value
))
5146 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5147 "-m", target_switches
[j
].name
);
5150 #ifdef TARGET_OPTIONS
5151 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5152 if (*target_options
[j
].variable
!= NULL
)
5155 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5156 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5157 prefix
, *target_options
[j
].variable
);
5161 fprintf (file
, "%s", term
);
5164 /* Record the beginning of a new source file, named FILENAME. */
5167 debug_start_source_file (filename
)
5168 register const char *filename ATTRIBUTE_UNUSED
;
5170 #ifdef DBX_DEBUGGING_INFO
5171 if (write_symbols
== DBX_DEBUG
)
5172 dbxout_start_new_source_file (filename
);
5174 #ifdef DWARF_DEBUGGING_INFO
5175 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5176 && write_symbols
== DWARF_DEBUG
)
5177 dwarfout_start_new_source_file (filename
);
5178 #endif /* DWARF_DEBUGGING_INFO */
5179 #ifdef DWARF2_DEBUGGING_INFO
5180 if (write_symbols
== DWARF2_DEBUG
)
5181 dwarf2out_start_source_file (filename
);
5182 #endif /* DWARF2_DEBUGGING_INFO */
5183 #ifdef SDB_DEBUGGING_INFO
5184 if (write_symbols
== SDB_DEBUG
)
5185 sdbout_start_new_source_file (filename
);
5189 /* Record the resumption of a source file. LINENO is the line number in
5190 the source file we are returning to. */
5193 debug_end_source_file (lineno
)
5194 register unsigned lineno ATTRIBUTE_UNUSED
;
5196 #ifdef DBX_DEBUGGING_INFO
5197 if (write_symbols
== DBX_DEBUG
)
5198 dbxout_resume_previous_source_file ();
5200 #ifdef DWARF_DEBUGGING_INFO
5201 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5202 && write_symbols
== DWARF_DEBUG
)
5203 dwarfout_resume_previous_source_file (lineno
);
5204 #endif /* DWARF_DEBUGGING_INFO */
5205 #ifdef DWARF2_DEBUGGING_INFO
5206 if (write_symbols
== DWARF2_DEBUG
)
5207 dwarf2out_end_source_file ();
5208 #endif /* DWARF2_DEBUGGING_INFO */
5209 #ifdef SDB_DEBUGGING_INFO
5210 if (write_symbols
== SDB_DEBUG
)
5211 sdbout_resume_previous_source_file ();
5215 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5216 the tail part of the directive line, i.e. the part which is past the
5217 initial whitespace, #, whitespace, directive-name, whitespace part. */
5220 debug_define (lineno
, buffer
)
5221 register unsigned lineno ATTRIBUTE_UNUSED
;
5222 register const char *buffer ATTRIBUTE_UNUSED
;
5224 #ifdef DWARF_DEBUGGING_INFO
5225 if (write_symbols
== DWARF_DEBUG
)
5226 dwarfout_define (lineno
, buffer
);
5227 #endif /* DWARF_DEBUGGING_INFO */
5228 #ifdef DWARF2_DEBUGGING_INFO
5229 if (write_symbols
== DWARF2_DEBUG
)
5230 dwarf2out_define (lineno
, buffer
);
5231 #endif /* DWARF2_DEBUGGING_INFO */
5234 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5235 the tail part of the directive line, i.e. the part which is past the
5236 initial whitespace, #, whitespace, directive-name, whitespace part. */
5239 debug_undef (lineno
, buffer
)
5240 register unsigned lineno ATTRIBUTE_UNUSED
;
5241 register const char *buffer ATTRIBUTE_UNUSED
;
5243 #ifdef DWARF_DEBUGGING_INFO
5244 if (write_symbols
== DWARF_DEBUG
)
5245 dwarfout_undef (lineno
, buffer
);
5246 #endif /* DWARF_DEBUGGING_INFO */
5247 #ifdef DWARF2_DEBUGGING_INFO
5248 if (write_symbols
== DWARF2_DEBUG
)
5249 dwarf2out_undef (lineno
, buffer
);
5250 #endif /* DWARF2_DEBUGGING_INFO */
5253 /* Returns nonzero if it is appropriate not to emit any debugging
5254 information for BLOCK, because it doesn't contain any instructions.
5255 This may not be the case for blocks containing nested functions, since
5256 we may actually call such a function even though the BLOCK information
5260 debug_ignore_block (block
)
5261 tree block ATTRIBUTE_UNUSED
;
5263 /* Never delete the BLOCK for the outermost scope
5264 of the function; we can refer to names from
5265 that scope even if the block notes are messed up. */
5266 if (is_body_block (block
))
5269 #ifdef DWARF2_DEBUGGING_INFO
5270 if (write_symbols
== DWARF2_DEBUG
)
5271 return dwarf2out_ignore_block (block
);