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 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 /* The FUNCTION_DECL for the function currently being compiled,
395 or 0 if between functions. */
396 tree current_function_decl
;
398 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
400 tree current_function_func_begin_label
;
402 /* Pointer to function to compute the name to use to print a declaration.
403 DECL is the declaration in question.
404 VERBOSITY determines what information will be printed:
405 0: DECL_NAME, demangled as necessary.
406 1: and scope information.
407 2: and any other information that might be interesting, such as function
408 parameter types in C++. */
410 const char *(*decl_printable_name
) PARAMS ((tree
, int));
412 /* Pointer to function to compute rtl for a language-specific tree code. */
414 typedef rtx (*lang_expand_expr_t
)
415 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
416 enum expand_modifier modifier
));
418 lang_expand_expr_t lang_expand_expr
= 0;
420 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
422 /* Pointer to function to finish handling an incomplete decl at the
423 end of compilation. */
425 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
427 /* Nonzero if doing dwarf2 duplicate elimination. */
429 int flag_eliminate_dwarf2_dups
= 0;
431 /* Nonzero if generating code to do profiling. */
433 int profile_flag
= 0;
435 /* Nonzero if generating code to do profiling on a line-by-line basis. */
437 int profile_block_flag
;
439 /* Nonzero if generating code to profile program flow graph arcs. */
441 int profile_arc_flag
= 0;
443 /* Nonzero if generating info for gcov to calculate line test coverage. */
445 int flag_test_coverage
= 0;
447 /* Nonzero indicates that branch taken probabilities should be calculated. */
449 int flag_branch_probabilities
= 0;
451 /* Nonzero if basic blocks should be reordered. */
453 int flag_reorder_blocks
= 0;
455 /* Nonzero if registers should be renamed. */
457 int flag_rename_registers
= 0;
459 /* Nonzero for -pedantic switch: warn about anything
460 that standard spec forbids. */
464 /* Temporarily suppress certain warnings.
465 This is set while reading code from a system header file. */
467 int in_system_header
= 0;
469 /* Don't print functions as they are compiled. -quiet. */
473 /* Print times taken by the various passes. -ftime-report. */
477 /* Print memory still in use at end of compilation (which may have little
478 to do with peak memory consumption). -fmem-report. */
482 /* Non-zero means to collect statistics which might be expensive
483 and to print them when we are done. */
484 int flag_detailed_statistics
= 0;
489 /* Nonzero means `char' should be signed. */
491 int flag_signed_char
;
493 /* Nonzero means give an enum type only as many bytes as it needs. */
495 int flag_short_enums
;
497 /* Nonzero for -fcaller-saves: allocate values in regs that need to
498 be saved across function calls, if that produces overall better code.
499 Optional now, so people can test it. */
501 #ifdef DEFAULT_CALLER_SAVES
502 int flag_caller_saves
= 1;
504 int flag_caller_saves
= 0;
507 /* Nonzero if structures and unions should be returned in memory.
509 This should only be defined if compatibility with another compiler or
510 with an ABI is needed, because it results in slower code. */
512 #ifndef DEFAULT_PCC_STRUCT_RETURN
513 #define DEFAULT_PCC_STRUCT_RETURN 1
516 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
518 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
520 /* Nonzero for -fforce-mem: load memory value into a register
521 before arithmetic on it. This makes better cse but slower compilation. */
523 int flag_force_mem
= 0;
525 /* Nonzero for -fforce-addr: load memory address into a register before
526 reference to memory. This makes better cse but slower compilation. */
528 int flag_force_addr
= 0;
530 /* Nonzero for -fdefer-pop: don't pop args after each function call;
531 instead save them up to pop many calls' args with one insns. */
533 int flag_defer_pop
= 0;
535 /* Nonzero for -ffloat-store: don't allocate floats and doubles
536 in extended-precision registers. */
538 int flag_float_store
= 0;
540 /* Nonzero for -fcse-follow-jumps:
541 have cse follow jumps to do a more extensive job. */
543 int flag_cse_follow_jumps
;
545 /* Nonzero for -fcse-skip-blocks:
546 have cse follow a branch around a block. */
547 int flag_cse_skip_blocks
;
549 /* Nonzero for -fexpensive-optimizations:
550 perform miscellaneous relatively-expensive optimizations. */
551 int flag_expensive_optimizations
;
553 /* Nonzero for -fthread-jumps:
554 have jump optimize output of loop. */
556 int flag_thread_jumps
;
558 /* Nonzero enables strength-reduction in loop.c. */
560 int flag_strength_reduce
= 0;
562 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
563 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
564 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
567 int flag_unroll_loops
;
569 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
570 This is generally not a win. */
572 int flag_unroll_all_loops
;
574 /* Nonzero forces all invariant computations in loops to be moved
577 int flag_move_all_movables
= 0;
579 /* Nonzero forces all general induction variables in loops to be
582 int flag_reduce_all_givs
= 0;
584 /* Nonzero to perform full register move optimization passes. This is the
587 int flag_regmove
= 0;
589 /* Nonzero for -fwritable-strings:
590 store string constants in data segment and don't uniquize them. */
592 int flag_writable_strings
= 0;
594 /* Nonzero means don't put addresses of constant functions in registers.
595 Used for compiling the Unix kernel, where strange substitutions are
596 done on the assembly output. */
598 int flag_no_function_cse
= 0;
600 /* Nonzero for -fomit-frame-pointer:
601 don't make a frame pointer in simple functions that don't require one. */
603 int flag_omit_frame_pointer
= 0;
605 /* Nonzero means place each function into its own section on those platforms
606 which support arbitrary section names and unlimited numbers of sections. */
608 int flag_function_sections
= 0;
610 /* ... and similar for data. */
612 int flag_data_sections
= 0;
614 /* Nonzero to inhibit use of define_optimization peephole opts. */
616 int flag_no_peephole
= 0;
618 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
619 operations in the interest of optimization. For example it allows
620 GCC to assume arguments to sqrt are nonnegative numbers, allowing
621 faster code for sqrt to be generated. */
623 int flag_fast_math
= 0;
625 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
627 int flag_optimize_sibling_calls
= 0;
629 /* Nonzero means the front end generally wants `errno' maintained by math
630 operations, like built-in SQRT, unless overridden by flag_fast_math. */
632 int flag_errno_math
= 1;
634 /* 0 means straightforward implementation of complex divide acceptable.
635 1 means wide ranges of inputs must work for complex divide.
636 2 means C99-like requirements for complex divide (not yet implemented). */
638 int flag_complex_divide_method
= 0;
640 /* Nonzero means all references through pointers are volatile. */
644 /* Nonzero means treat all global and extern variables as volatile. */
646 int flag_volatile_global
;
648 /* Nonzero means treat all static variables as volatile. */
650 int flag_volatile_static
;
652 /* Nonzero means just do syntax checking; don't output anything. */
654 int flag_syntax_only
= 0;
656 /* Nonzero means perform global cse. */
658 static int flag_gcse
;
660 /* Nonzero means to use global dataflow analysis to eliminate
661 useless null pointer tests. */
663 static int flag_delete_null_pointer_checks
;
665 /* Nonzero means to rerun cse after loop optimization. This increases
666 compilation time about 20% and picks up a few more common expressions. */
668 static int flag_rerun_cse_after_loop
;
670 /* Nonzero means to run loop optimizations twice. */
672 int flag_rerun_loop_opt
;
674 /* Nonzero for -finline-functions: ok to inline functions that look like
675 good inline candidates. */
677 int flag_inline_functions
;
679 /* Nonzero for -fkeep-inline-functions: even if we make a function
680 go inline everywhere, keep its definition around for debugging
683 int flag_keep_inline_functions
;
685 /* Nonzero means that functions will not be inlined. */
689 /* Nonzero means that we should emit static const variables
690 regardless of whether or not optimization is turned on. */
692 int flag_keep_static_consts
= 1;
694 /* Nonzero means we should be saving declaration info into a .X file. */
696 int flag_gen_aux_info
= 0;
698 /* Specified name of aux-info file. */
700 static char *aux_info_file_name
;
702 /* Nonzero means make the text shared if supported. */
704 int flag_shared_data
;
706 /* Nonzero means schedule into delayed branch slots if supported. */
708 int flag_delayed_branch
;
710 /* Nonzero if we are compiling pure (sharable) code.
711 Value is 1 if we are doing reasonable (i.e. simple
712 offset into offset table) pic. Value is 2 if we can
713 only perform register offsets. */
717 /* Nonzero means generate extra code for exception handling and enable
718 exception handling. */
722 /* Nonzero means use the new model for exception handling. Replaces
723 -DNEW_EH_MODEL as a compile option. */
725 int flag_new_exceptions
= 1;
727 /* Nonzero means generate frame unwind info table when supported. */
729 int flag_unwind_tables
= 0;
731 /* Nonzero means don't place uninitialized global data in common storage
736 /* Nonzero means pretend it is OK to examine bits of target floats,
737 even if that isn't true. The resulting code will have incorrect constants,
738 but the same series of instructions that the native compiler would make. */
740 int flag_pretend_float
;
742 /* Nonzero means change certain warnings into errors.
743 Usually these are warnings about failure to conform to some standard. */
745 int flag_pedantic_errors
= 0;
747 /* flag_schedule_insns means schedule insns within basic blocks (before
749 flag_schedule_insns_after_reload means schedule insns after
752 int flag_schedule_insns
= 0;
753 int flag_schedule_insns_after_reload
= 0;
755 /* The following flags have effect only for scheduling before register
758 flag_schedule_interblock means schedule insns accross basic blocks.
759 flag_schedule_speculative means allow speculative motion of non-load insns.
760 flag_schedule_speculative_load means allow speculative motion of some
762 flag_schedule_speculative_load_dangerous allows speculative motion of more
765 int flag_schedule_interblock
= 1;
766 int flag_schedule_speculative
= 1;
767 int flag_schedule_speculative_load
= 0;
768 int flag_schedule_speculative_load_dangerous
= 0;
770 int flag_single_precision_constant
;
772 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
773 by a cheaper branch on a count register. */
774 int flag_branch_on_count_reg
= 1;
776 /* -finhibit-size-directive inhibits output of .size for ELF.
777 This is used only for compiling crtstuff.c,
778 and it may be extended to other effects
779 needed for crtstuff.c on other systems. */
780 int flag_inhibit_size_directive
= 0;
782 /* -fverbose-asm causes extra commentary information to be produced in
783 the generated assembly code (to make it more readable). This option
784 is generally only of use to those who actually need to read the
785 generated assembly code (perhaps while debugging the compiler itself).
786 -fno-verbose-asm, the default, causes the extra information
787 to be omitted and is useful when comparing two assembler files. */
789 int flag_verbose_asm
= 0;
791 /* -dA causes debug 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 Currently, this switch is only used by dwarfout.c; however, it is intended
796 to be a catchall for printing debug information in the assembler file. */
798 int flag_debug_asm
= 0;
800 /* -dP causes the rtl to be emitted as a comment in assembly. */
802 int flag_dump_rtl_in_asm
= 0;
804 /* -fgnu-linker specifies use of the GNU linker for initializations.
805 (Or, more generally, a linker that handles initializations.)
806 -fno-gnu-linker says that collect2 will be used. */
808 int flag_gnu_linker
= 0;
810 int flag_gnu_linker
= 1;
816 /* Enable dead code elimination. */
819 /* Tag all structures with __attribute__(packed). */
820 int flag_pack_struct
= 0;
822 /* Emit code to check for stack overflow; also may cause large objects
823 to be allocated dynamically. */
824 int flag_stack_check
;
826 /* When non-NULL, indicates that whenever space is allocated on the
827 stack, the resulting stack pointer must not pass this
828 address---that is, for stacks that grow downward, the stack pointer
829 must always be greater than or equal to this address; for stacks
830 that grow upward, the stack pointer must be less than this address.
831 At present, the rtx may be either a REG or a SYMBOL_REF, although
832 the support provided depends on the backend. */
835 /* -fcheck-memory-usage causes extra code to be generated in order to check
836 memory accesses. This is used by a detector of bad memory accesses such
838 int flag_check_memory_usage
= 0;
840 /* -fprefix-function-name causes function name to be prefixed. This
841 can be used with -fcheck-memory-usage to isolate code compiled with
842 -fcheck-memory-usage. */
843 int flag_prefix_function_name
= 0;
845 /* 0 if pointer arguments may alias each other. True in C.
846 1 if pointer arguments may not alias each other but may alias
848 2 if pointer arguments may not alias each other and may not
849 alias global variables. True in Fortran.
850 This defaults to 0 for C. */
851 int flag_argument_noalias
= 0;
853 /* Nonzero if we should do (language-dependent) alias analysis.
854 Typically, this analysis will assume that expressions of certain
855 types do not alias expressions of certain other types. Only used
856 if alias analysis (in general) is enabled. */
857 int flag_strict_aliasing
= 0;
859 /* Instrument functions with calls at entry and exit, for profiling. */
860 int flag_instrument_function_entry_exit
= 0;
862 /* Nonzero means ignore `#ident' directives. 0 means handle them.
863 On SVR4 targets, it also controls whether or not to emit a
864 string identifying the compiler. */
866 int flag_no_ident
= 0;
868 /* This will perform a peephole pass before sched2. */
869 int flag_peephole2
= 0;
871 /* This will try to guess branch probabilities. */
872 int flag_guess_branch_prob
= 0;
874 /* -fbounded-pointers causes gcc to compile pointers as composite
875 objects occupying three words: the pointer value, the base address
876 of the referent object, and the address immediately beyond the end
877 of the referent object. The base and extent allow us to perform
878 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
879 int flag_bounded_pointers
= 0;
881 /* -fcheck-bounds causes gcc to generate array bounds checks.
882 For C, C++: defaults to value of flag_bounded_pointers.
883 For ObjC: defaults to off.
884 For Java: defaults to on.
885 For Fortran: defaults to off.
886 For CHILL: defaults to off. */
887 int flag_bounds_check
= 0;
889 /* If one, renumber instruction UIDs to reduce the number of
890 unused UIDs if there are a lot of instructions. If greater than
891 one, unconditionally renumber instruction UIDs. */
892 int flag_renumber_insns
= 1;
894 /* Values of the -falign-* flags: how much to align labels in code.
895 0 means `use default', 1 means `don't align'.
896 For each variable, there is an _log variant which is the power
897 of two not less than the variable, for .align output. */
904 int align_labels_log
;
906 int align_functions_log
;
908 /* Table of supported debugging formats. */
912 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
913 constant expression, we use NO_DEBUG in its place. */
914 enum debug_info_type debug_type
;
915 int use_extensions_p
;
916 const char *description
;
920 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
921 "Generate default debug format output" },
922 { "gdb", NO_DEBUG
, 1, "Generate default extended debug format output" },
923 #ifdef DBX_DEBUGGING_INFO
924 { "stabs", DBX_DEBUG
, 0, "Generate STABS format debug output" },
925 { "stabs+", DBX_DEBUG
, 1, "Generate extended STABS format debug output" },
927 #ifdef DWARF_DEBUGGING_INFO
928 { "dwarf", DWARF_DEBUG
, 0, "Generate DWARF-1 format debug output"},
929 { "dwarf+", DWARF_DEBUG
, 1,
930 "Generated extended DWARF-1 format debug output" },
932 #ifdef DWARF2_DEBUGGING_INFO
933 { "dwarf-2", DWARF2_DEBUG
, 0, "Enable DWARF-2 debug output" },
935 #ifdef XCOFF_DEBUGGING_INFO
936 { "xcoff", XCOFF_DEBUG
, 0, "Generate XCOFF format debug output" },
937 { "xcoff+", XCOFF_DEBUG
, 1, "Generate extended XCOFF format debug output" },
939 #ifdef SDB_DEBUGGING_INFO
940 { "coff", SDB_DEBUG
, 0, "Generate COFF format debug output" },
950 const char *description
;
952 lang_independent_options
;
956 /* Add or remove a leading underscore from user symbols. */
957 int flag_leading_underscore
= -1;
959 /* The user symbol prefix after having resolved same. */
960 const char *user_label_prefix
;
962 static const param_info lang_independent_params
[] = {
963 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
965 #include "params.def"
970 /* A default for same. */
971 #ifndef USER_LABEL_PREFIX
972 #define USER_LABEL_PREFIX ""
975 /* Table of language-independent -f options.
976 STRING is the option name. VARIABLE is the address of the variable.
977 ON_VALUE is the value to store in VARIABLE
978 if `-fSTRING' is seen as an option.
979 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
981 lang_independent_options f_options
[] =
983 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
984 "Perform DWARF2 duplicate elimination"},
985 {"float-store", &flag_float_store
, 1,
986 "Do not store floats in registers" },
987 {"volatile", &flag_volatile
, 1,
988 "Consider all mem refs through pointers as volatile"},
989 {"volatile-global", &flag_volatile_global
, 1,
990 "Consider all mem refs to global data to be volatile" },
991 {"volatile-static", &flag_volatile_static
, 1,
992 "Consider all mem refs to static data to be volatile" },
993 {"defer-pop", &flag_defer_pop
, 1,
994 "Defer popping functions args from stack until later" },
995 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
996 "When possible do not generate stack frames"},
997 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
998 "Optimize sibling and tail recursive calls" },
999 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1000 "When running CSE, follow jumps to their targets" },
1001 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1002 "When running CSE, follow conditional jumps" },
1003 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1004 "Perform a number of minor, expensive optimisations" },
1005 {"thread-jumps", &flag_thread_jumps
, 1,
1006 "Perform jump threading optimisations"},
1007 {"strength-reduce", &flag_strength_reduce
, 1,
1008 "Perform strength reduction optimisations" },
1009 {"unroll-loops", &flag_unroll_loops
, 1,
1010 "Perform loop unrolling when iteration count is known" },
1011 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1012 "Perform loop unrolling for all loops" },
1013 {"move-all-movables", &flag_move_all_movables
, 1,
1014 "Force all loop invariant computations out of loops" },
1015 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1016 "Strength reduce all loop general induction variables" },
1017 {"writable-strings", &flag_writable_strings
, 1,
1018 "Store strings in writable data section" },
1019 {"peephole", &flag_no_peephole
, 0,
1020 "Enable machine specific peephole optimisations" },
1021 {"force-mem", &flag_force_mem
, 1,
1022 "Copy memory operands into registers before using" },
1023 {"force-addr", &flag_force_addr
, 1,
1024 "Copy memory address constants into regs before using" },
1025 {"function-cse", &flag_no_function_cse
, 0,
1026 "Allow function addresses to be held in registers" },
1027 {"inline-functions", &flag_inline_functions
, 1,
1028 "Integrate simple functions into their callers" },
1029 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1030 "Generate code for funcs even if they are fully inlined" },
1031 {"inline", &flag_no_inline
, 0,
1032 "Pay attention to the 'inline' keyword"},
1033 {"keep-static-consts", &flag_keep_static_consts
, 1,
1034 "Emit static const variables even if they are not used" },
1035 {"syntax-only", &flag_syntax_only
, 1,
1036 "Check for syntax errors, then stop" },
1037 {"shared-data", &flag_shared_data
, 1,
1038 "Mark data as shared rather than private" },
1039 {"caller-saves", &flag_caller_saves
, 1,
1040 "Enable saving registers around function calls" },
1041 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1042 "Return 'short' aggregates in memory, not registers" },
1043 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1044 "Return 'short' aggregates in registers" },
1045 {"delayed-branch", &flag_delayed_branch
, 1,
1046 "Attempt to fill delay slots of branch instructions" },
1047 {"gcse", &flag_gcse
, 1,
1048 "Perform the global common subexpression elimination" },
1049 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1050 "Run CSE pass after loop optimisations"},
1051 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1052 "Run the loop optimiser twice"},
1053 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1054 "Delete useless null pointer checks" },
1055 {"pretend-float", &flag_pretend_float
, 1,
1056 "Pretend that host and target use the same FP format"},
1057 {"schedule-insns", &flag_schedule_insns
, 1,
1058 "Reschedule instructions before register allocation"},
1059 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1060 "Reschedule instructions after register allocation"},
1061 {"sched-interblock",&flag_schedule_interblock
, 1,
1062 "Enable scheduling across basic blocks" },
1063 {"sched-spec",&flag_schedule_speculative
, 1,
1064 "Allow speculative motion of non-loads" },
1065 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1066 "Allow speculative motion of some loads" },
1067 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1068 "Allow speculative motion of more loads" },
1069 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1070 "Replace add,compare,branch with branch on count reg"},
1071 {"pic", &flag_pic
, 1,
1072 "Generate position independent code, if possible"},
1073 {"PIC", &flag_pic
, 2, ""},
1074 {"exceptions", &flag_exceptions
, 1,
1075 "Enable exception handling" },
1076 {"new-exceptions", &flag_new_exceptions
, 1,
1077 "Use the new model for exception handling" },
1078 {"unwind-tables", &flag_unwind_tables
, 1,
1079 "Just generate unwind tables for exception handling" },
1080 {"sjlj-exceptions", &exceptions_via_longjmp
, 1,
1081 "Use setjmp/longjmp to handle exceptions" },
1082 {"asynchronous-exceptions", &asynchronous_exceptions
, 1,
1083 "Support asynchronous exceptions" },
1084 {"profile-arcs", &profile_arc_flag
, 1,
1085 "Insert arc based program profiling code" },
1086 {"test-coverage", &flag_test_coverage
, 1,
1087 "Create data files needed by gcov" },
1088 {"branch-probabilities", &flag_branch_probabilities
, 1,
1089 "Use profiling information for branch probabilities" },
1090 {"reorder-blocks", &flag_reorder_blocks
, 1,
1091 "Reorder basic blocks to improve code placement" },
1092 {"rename-registers", &flag_rename_registers
, 1,
1093 "Do the register renaming optimization pass"},
1094 {"fast-math", &flag_fast_math
, 1,
1095 "Improve FP speed by violating ANSI & IEEE rules" },
1096 {"common", &flag_no_common
, 0,
1097 "Do not put unitialised globals in the common section" },
1098 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1099 "Do not generate .size directives" },
1100 {"function-sections", &flag_function_sections
, 1,
1101 "place each function into its own section" },
1102 {"data-sections", &flag_data_sections
, 1,
1103 "place data items into their own section" },
1104 {"verbose-asm", &flag_verbose_asm
, 1,
1105 "Add extra commentry to assembler output"},
1106 {"gnu-linker", &flag_gnu_linker
, 1,
1107 "Output GNU ld formatted global initialisers"},
1108 {"regmove", &flag_regmove
, 1,
1109 "Enables a register move optimisation"},
1110 {"optimize-register-move", &flag_regmove
, 1,
1111 "Do the full regmove optimization pass"},
1112 {"pack-struct", &flag_pack_struct
, 1,
1113 "Pack structure members together without holes" },
1114 {"stack-check", &flag_stack_check
, 1,
1115 "Insert stack checking code into the program" },
1116 {"argument-alias", &flag_argument_noalias
, 0,
1117 "Specify that arguments may alias each other & globals"},
1118 {"argument-noalias", &flag_argument_noalias
, 1,
1119 "Assume arguments may alias globals but not each other"},
1120 {"argument-noalias-global", &flag_argument_noalias
, 2,
1121 "Assume arguments do not alias each other or globals" },
1122 {"strict-aliasing", &flag_strict_aliasing
, 1,
1123 "Assume strict aliasing rules apply" },
1124 {"align-loops", &align_loops
, 0,
1125 "Align the start of loops" },
1126 {"align-jumps", &align_jumps
, 0,
1127 "Align labels which are only reached by jumping" },
1128 {"align-labels", &align_labels
, 0,
1129 "Align all labels" },
1130 {"align-functions", &align_functions
, 0,
1131 "Align the start of functions" },
1132 {"check-memory-usage", &flag_check_memory_usage
, 1,
1133 "Generate code to check every memory access" },
1134 {"prefix-function-name", &flag_prefix_function_name
, 1,
1135 "Add a prefix to all function names" },
1136 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1137 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1138 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1139 "Instrument function entry/exit with profiling calls"},
1140 {"ssa", &flag_ssa
, 1,
1141 "Enable SSA optimizations" },
1142 {"dce", &flag_dce
, 1,
1143 "Enable dead code elimination" },
1144 {"leading-underscore", &flag_leading_underscore
, 1,
1145 "External symbols have a leading underscore" },
1146 {"ident", &flag_no_ident
, 0,
1147 "Process #ident directives"},
1148 { "peephole2", &flag_peephole2
, 1,
1149 "Enables an rtl peephole pass run before sched2" },
1150 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1151 "Enables guessing of branch probabilities" },
1152 {"math-errno", &flag_errno_math
, 1,
1153 "Set errno after built-in math functions"},
1154 {"bounded-pointers", &flag_bounded_pointers
, 1,
1155 "Compile pointers as triples: value, base & end" },
1156 {"bounds-check", &flag_bounds_check
, 1,
1157 "Generate code to check bounds before dereferencing pointers and arrays" },
1158 {"single-precision-constant", &flag_single_precision_constant
, 1,
1159 "Convert floating point constant to single precision constant"},
1160 {"time-report", &time_report
, 1,
1161 "Report time taken by each compiler pass at end of run"},
1162 {"mem-report", &mem_report
, 1,
1163 "Report on permanent memory allocation at end of run"},
1164 { "trapv", &flag_trapv
, 1,
1165 "Trap for signed overflow in addition / subtraction / multiplication." },
1168 /* Table of language-specific options. */
1170 static struct lang_opt
1173 const char *description
;
1175 documented_lang_options
[] =
1177 /* In order not to overload the --help output, the convention
1178 used here is to only describe those options which are not
1179 enabled by default. */
1181 { "-ansi", "Compile just for ISO C89" },
1182 { "-fallow-single-precision",
1183 "Do not promote floats to double if using -traditional" },
1184 { "-std= ", "Determine language standard"},
1186 { "-fsigned-bitfields", "" },
1187 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1188 { "-fno-signed-bitfields", "" },
1189 { "-fno-unsigned-bitfields","" },
1190 { "-fsigned-char", "Make 'char' be signed by default"},
1191 { "-funsigned-char", "Make 'char' be unsigned by default"},
1192 { "-fno-signed-char", "" },
1193 { "-fno-unsigned-char", "" },
1195 { "-ftraditional", "" },
1196 { "-traditional", "Attempt to support traditional K&R style C"},
1197 { "-fnotraditional", "" },
1198 { "-fno-traditional", "" },
1201 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1202 { "-fbuiltin", "" },
1203 { "-fno-builtin", "Do not recognise any built in functions" },
1204 { "-fhosted", "Assume normal C execution environment" },
1205 { "-fno-hosted", "" },
1207 "Assume that standard libraries & main might not exist" },
1208 { "-fno-freestanding", "" },
1209 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1210 { "-fno-cond-mismatch", "" },
1211 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1212 { "-fno-dollars-in-identifiers", "" },
1213 { "-fpreprocessed", "" },
1214 { "-fno-preprocessed", "" },
1215 { "-fshort-double", "Use the same size for double as for float" },
1216 { "-fno-short-double", "" },
1217 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1218 { "-fno-short-enums", "" },
1219 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1220 { "-fno-short-wchar", "" },
1222 { "-Wall", "Enable most warning messages" },
1223 { "-Wbad-function-cast",
1224 "Warn about casting functions to incompatible types" },
1225 { "-Wno-bad-function-cast", "" },
1226 { "-Wno-missing-noreturn", "" },
1227 { "-Wmissing-format-attribute",
1228 "Warn about functions which might be candidates for format attributes" },
1229 { "-Wno-missing-format-attribute", "" },
1230 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1231 { "-Wno-cast-qual", "" },
1232 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1233 { "-Wno-char-subscripts", "" },
1234 { "-Wcomment", "Warn if nested comments are detected" },
1235 { "-Wno-comment", "" },
1236 { "-Wcomments", "Warn if nested comments are detected" },
1237 { "-Wno-comments", "" },
1238 { "-Wconversion", "Warn about possibly confusing type conversions" },
1239 { "-Wno-conversion", "" },
1240 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1241 { "-Wno-format", "" },
1242 { "-Wformat-y2k", "" },
1243 { "-Wno-format-y2k",
1244 "Don't warn about strftime formats yielding 2 digit years" },
1245 { "-Wformat-extra-args", "" },
1246 { "-Wno-format-extra-args",
1247 "Don't warn about too many arguments to format functions" },
1248 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1249 { "-Wno-format-nonliteral", "" },
1250 { "-Wformat-security",
1251 "Warn about possible security problems with format functions" },
1252 { "-Wno-format-security", "" },
1253 { "-Wimplicit-function-declaration",
1254 "Warn about implicit function declarations" },
1255 { "-Wno-implicit-function-declaration", "" },
1256 { "-Werror-implicit-function-declaration", "" },
1257 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1258 { "-Wno-implicit-int", "" },
1259 { "-Wimplicit", "" },
1260 { "-Wno-implicit", "" },
1261 { "-Wimport", "Warn about the use of the #import directive" },
1262 { "-Wno-import", "" },
1263 { "-Wlong-long","" },
1264 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1265 { "-Wmain", "Warn about suspicious declarations of main" },
1266 { "-Wno-main", "" },
1267 { "-Wmissing-braces",
1268 "Warn about possibly missing braces around initialisers" },
1269 { "-Wno-missing-braces", "" },
1270 { "-Wmissing-declarations",
1271 "Warn about global funcs without previous declarations"},
1272 { "-Wno-missing-declarations", "" },
1273 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1274 { "-Wno-missing-prototypes", "" },
1275 { "-Wmultichar", "Warn about use of multicharacter literals"},
1276 { "-Wno-multichar", "" },
1277 { "-Wnested-externs", "Warn about externs not at file scope level" },
1278 { "-Wno-nested-externs", "" },
1279 { "-Wparentheses", "Warn about possible missing parentheses" },
1280 { "-Wno-parentheses", "" },
1281 { "-Wsequence-point",
1282 "Warn about possible violations of sequence point rules" },
1283 { "-Wno-sequence-point", "" },
1284 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1285 { "-Wno-pointer-arith", "" },
1286 { "-Wredundant-decls",
1287 "Warn about multiple declarations of the same object" },
1288 { "-Wno-redundant-decls", "" },
1289 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1290 { "-Wno-sign-compare", "" },
1291 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1292 { "-Wno-float-equal", "" },
1293 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1294 { "-Wno-unknown-pragmas", "" },
1295 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1296 { "-Wno-strict-prototypes", "" },
1297 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1298 { "-Wno-traditional", "" },
1299 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1300 { "-Wno-trigraphs", "" },
1302 { "-Wno-undef", "" },
1303 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1304 { "-Wno-write-strings", "" },
1306 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1308 #include "options.h"
1312 /* Here is a table, controlled by the tm.h file, listing each -m switch
1313 and which bits in `target_switches' it should set or clear.
1314 If VALUE is positive, it is bits to set.
1315 If VALUE is negative, -VALUE is bits to clear.
1316 (The sign bit is not used so there is no confusion.) */
1322 const char *description
;
1324 target_switches
[] = TARGET_SWITCHES
;
1326 /* This table is similar, but allows the switch to have a value. */
1328 #ifdef TARGET_OPTIONS
1332 const char **variable
;
1333 const char *description
;
1335 target_options
[] = TARGET_OPTIONS
;
1338 /* Options controlling warnings. */
1340 /* Don't print warning messages. -w. */
1342 int inhibit_warnings
= 0;
1344 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1346 int warn_system_headers
= 0;
1348 /* Print various extra warnings. -W. */
1350 int extra_warnings
= 0;
1352 /* Treat warnings as errors. -Werror. */
1354 int warnings_are_errors
= 0;
1356 /* Nonzero to warn about unused variables, functions et.al. */
1358 int warn_unused_function
;
1359 int warn_unused_label
;
1360 int warn_unused_parameter
;
1361 int warn_unused_variable
;
1362 int warn_unused_value
;
1365 set_Wunused (setting
)
1368 warn_unused_function
= setting
;
1369 warn_unused_label
= setting
;
1370 /* Unused function parameter warnings are reported when either ``-W
1371 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1372 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1374 warn_unused_parameter
= 0;
1375 else if (!warn_unused_parameter
)
1376 warn_unused_parameter
= -1;
1377 warn_unused_variable
= setting
;
1378 warn_unused_value
= setting
;
1381 /* Nonzero to warn about code which is never reached. */
1383 int warn_notreached
;
1385 /* Nonzero to warn about variables used before they are initialized. */
1387 int warn_uninitialized
;
1389 /* Nonzero means warn about all declarations which shadow others. */
1393 /* Warn if a switch on an enum fails to have a case for every enum value. */
1397 /* Nonzero means warn about function definitions that default the return type
1398 or that use a null return and have a return-type other than void. */
1400 int warn_return_type
;
1402 /* Nonzero means warn about pointer casts that increase the required
1403 alignment of the target type (and might therefore lead to a crash
1404 due to a misaligned access). */
1406 int warn_cast_align
;
1408 /* Nonzero means warn about any identifiers that match in the first N
1409 characters. The value N is in `id_clash_len'. */
1414 /* Nonzero means warn about any objects definitions whose size is larger
1415 than N bytes. Also want about function definitions whose returned
1416 values are larger than N bytes. The value N is in `larger_than_size'. */
1418 int warn_larger_than
;
1419 HOST_WIDE_INT larger_than_size
;
1421 /* Nonzero means warn if inline function is too large. */
1425 /* Warn if a function returns an aggregate,
1426 since there are often incompatible calling conventions for doing this. */
1428 int warn_aggregate_return
;
1430 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1434 /* Warn when gcc pads a structure to an alignment boundary. */
1438 /* Warn when an optimization pass is disabled. */
1440 int warn_disabled_optimization
;
1442 /* Warn about functions which might be candidates for attribute noreturn. */
1444 int warn_missing_noreturn
;
1446 /* Likewise for -W. */
1448 lang_independent_options W_options
[] =
1450 {"unused-function", &warn_unused_function
, 1, "Warn when a function is unused" },
1451 {"unused-label", &warn_unused_label
, 1, "Warn when a label is unused" },
1452 {"unused-parameter", &warn_unused_parameter
, 1, "Warn when a function parameter is unused" },
1453 {"unused-variable", &warn_unused_variable
, 1, "Warn when a variable is unused" },
1454 {"unused-value", &warn_unused_value
, 1, "Warn when an expression value is unused" },
1455 {"system-headers", &warn_system_headers
, 1, "Do not suppress warnings from system headers"},
1456 {"error", &warnings_are_errors
, 1, ""},
1457 {"shadow", &warn_shadow
, 1, "Warn when one local variable shadows another" },
1458 {"switch", &warn_switch
, 1,
1459 "Warn about enumerated switches missing a specific case" },
1460 {"aggregate-return", &warn_aggregate_return
, 1,
1461 "Warn about returning structures, unions or arrays" },
1462 {"cast-align", &warn_cast_align
, 1,
1463 "Warn about pointer casts which increase alignment" },
1464 {"unreachable-code", &warn_notreached
, 1,
1465 "Warn about code that will never be executed" },
1466 {"uninitialized", &warn_uninitialized
, 1,
1467 "Warn about unitialized automatic variables"},
1468 {"inline", &warn_inline
, 1,
1469 "Warn when an inlined function cannot be inlined"},
1470 {"packed", &warn_packed
, 1,
1471 "Warn when the packed attribute has no effect on struct layout"},
1472 {"padded", &warn_padded
, 1,
1473 "Warn when padding is required to align struct members"},
1474 {"disabled-optimization", &warn_disabled_optimization
, 1,
1475 "Warn when an optimization pass is disabled"},
1476 {"missing-noreturn", &warn_missing_noreturn
, 1,
1477 "Warn about functions which might be candidates for attribute noreturn"}
1480 /* Output files for assembler code (real compiler output)
1481 and debugging dumps. */
1484 FILE *aux_info_file
;
1485 FILE *rtl_dump_file
= NULL
;
1487 /* Decode the string P as an integral parameter.
1488 If the string is indeed an integer return its numeric value else
1489 issue an Invalid Option error for the option PNAME and return DEFVAL.
1490 If PNAME is zero just return DEFVAL, do not call error. */
1493 read_integral_parameter (p
, pname
, defval
)
1498 const char *endp
= p
;
1502 if (*endp
>= '0' && *endp
<= '9')
1511 error ("Invalid option `%s'", pname
);
1519 /* This is the default decl_printable_name function. */
1522 decl_name (decl
, verbosity
)
1524 int verbosity ATTRIBUTE_UNUSED
;
1526 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1530 /* This calls abort and is used to avoid problems when abort if a macro.
1531 It is used when we need to pass the address of abort. */
1539 /* When `malloc.c' is compiled with `rcheck' defined,
1540 it calls this function to report clobberage. */
1544 const char *s ATTRIBUTE_UNUSED
;
1549 /* Return the logarithm of X, base 2, considering X unsigned,
1550 if X is a power of 2. Otherwise, returns -1.
1552 This should be used via the `exact_log2' macro. */
1556 register unsigned HOST_WIDE_INT x
;
1558 register int log
= 0;
1559 /* Test for 0 or a power of 2. */
1560 if (x
== 0 || x
!= (x
& -x
))
1562 while ((x
>>= 1) != 0)
1567 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1568 If X is 0, return -1.
1570 This should be used via the floor_log2 macro. */
1574 register unsigned HOST_WIDE_INT x
;
1576 register int log
= -1;
1583 /* Return the approximate positive square root of a number N. This is for
1584 statistical reports, not code generation. */
1599 d
= (s
* s
- x
) / (2 * s
);
1606 static int float_handler_set
;
1608 jmp_buf float_handler
;
1610 /* Signals actually come here. */
1613 float_signal (signo
)
1614 /* If this is missing, some compilers complain. */
1615 int signo ATTRIBUTE_UNUSED
;
1617 if (float_handled
== 0)
1618 crash_signal (signo
);
1619 #if defined (USG) || defined (hpux)
1620 /* Re-enable the signal catcher. */
1621 signal (SIGFPE
, float_signal
);
1624 signal (SIGFPE
, float_signal
);
1625 longjmp (float_handler
, 1);
1628 /* Specify where to longjmp to when a floating arithmetic error happens.
1629 If HANDLER is 0, it means don't handle the errors any more. */
1632 set_float_handler (handler
)
1635 float_handled
= (handler
!= 0);
1637 bcopy ((char *) handler
, (char *) float_handler
, sizeof (float_handler
));
1639 if (float_handled
&& ! float_handler_set
)
1641 signal (SIGFPE
, float_signal
);
1642 float_handler_set
= 1;
1646 /* This is a wrapper function for code which might elicit an
1647 arithmetic exception. That code should be passed in as a function
1648 pointer FN, and one argument DATA. DATA is usually a struct which
1649 contains the real input and output for function FN. This function
1650 returns 0 (failure) if longjmp was called (i.e. an exception
1651 occured.) It returns 1 (success) otherwise. */
1654 do_float_handler (fn
, data
)
1655 void (*fn
) PARAMS ((PTR
));
1662 /* We got here via longjmp () caused by an exception in function
1664 set_float_handler (NULL
);
1668 set_float_handler (buf
);
1670 set_float_handler (NULL
);
1674 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1675 into ICE messages, which is much more user friendly. */
1678 crash_signal (signo
)
1681 internal_error ("Internal error: %s", strsignal (signo
));
1684 /* Strip off a legitimate source ending from the input string NAME of
1685 length LEN. Rather than having to know the names used by all of
1686 our front ends, we strip off an ending of a period followed by
1687 up to five characters. (Java uses ".class".) */
1690 strip_off_ending (name
, len
)
1695 for (i
= 2; i
< 6 && len
> i
; i
++)
1697 if (name
[len
- i
] == '.')
1699 name
[len
- i
] = '\0';
1705 /* Given a file name X, return the nondirectory portion. */
1708 file_name_nondirectory (x
)
1711 char *tmp
= (char *) strrchr (x
, '/');
1712 if (DIR_SEPARATOR
!= '/' && ! tmp
)
1713 tmp
= (char *) strrchr (x
, DIR_SEPARATOR
);
1715 return (char *) (tmp
+ 1);
1720 /* Output a quoted string. */
1723 output_quoted_string (asm_file
, string
)
1727 #ifdef OUTPUT_QUOTED_STRING
1728 OUTPUT_QUOTED_STRING (asm_file
, string
);
1732 putc ('\"', asm_file
);
1733 while ((c
= *string
++) != 0)
1735 if (c
== '\"' || c
== '\\')
1736 putc ('\\', asm_file
);
1739 putc ('\"', asm_file
);
1743 /* Output a file name in the form wanted by System V. */
1746 output_file_directive (asm_file
, input_name
)
1748 const char *input_name
;
1750 int len
= strlen (input_name
);
1751 const char *na
= input_name
+ len
;
1753 /* NA gets INPUT_NAME sans directory names. */
1754 while (na
> input_name
)
1756 if (IS_DIR_SEPARATOR (na
[-1]))
1761 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1762 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1764 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1765 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1767 fprintf (asm_file
, "\t.file\t");
1768 output_quoted_string (asm_file
, na
);
1769 fputc ('\n', asm_file
);
1774 #ifdef ASM_IDENTIFY_LANGUAGE
1775 /* Routine to build language identifier for object file. */
1778 output_lang_identify (asm_out_file
)
1781 int len
= strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1782 char *s
= (char *) alloca (len
);
1784 sprintf (s
, "__gnu_compiled_%s", lang_identify ());
1785 ASM_OUTPUT_LABEL (asm_out_file
, s
);
1789 /* Routine to open a dump file. Return true if the dump file is enabled. */
1792 open_dump_file (index
, decl
)
1793 enum dump_file_index index
;
1797 const char *open_arg
;
1800 if (! dump_file
[index
].enabled
)
1803 timevar_push (TV_DUMP
);
1804 if (rtl_dump_file
!= NULL
)
1805 fclose (rtl_dump_file
);
1807 sprintf (seq
, ".%02d.", index
);
1809 if (! dump_file
[index
].initialized
)
1811 /* If we've not initialized the files, do so now. */
1812 if (graph_dump_format
!= no_graph
1813 && dump_file
[index
].graph_dump_p
)
1815 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1816 clean_graph_dump_file (dump_base_name
, dump_name
);
1819 dump_file
[index
].initialized
= 1;
1825 dump_name
= concat (dump_base_name
, seq
,
1826 dump_file
[index
].extension
, NULL
);
1828 rtl_dump_file
= fopen (dump_name
, open_arg
);
1829 if (rtl_dump_file
== NULL
)
1830 fatal_io_error ("can't open %s", dump_name
);
1835 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1836 decl_printable_name (decl
, 2));
1838 timevar_pop (TV_DUMP
);
1842 /* Routine to close a dump file. */
1845 close_dump_file (index
, func
, insns
)
1846 enum dump_file_index index
;
1847 void (*func
) PARAMS ((FILE *, rtx
));
1850 if (! rtl_dump_file
)
1853 timevar_push (TV_DUMP
);
1855 && graph_dump_format
!= no_graph
1856 && dump_file
[index
].graph_dump_p
)
1861 sprintf (seq
, ".%02d.", index
);
1862 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1863 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1868 func (rtl_dump_file
, insns
);
1870 fflush (rtl_dump_file
);
1871 fclose (rtl_dump_file
);
1873 rtl_dump_file
= NULL
;
1874 timevar_pop (TV_DUMP
);
1877 /* Do any final processing required for the declarations in VEC, of
1878 which there are LEN. We write out inline functions and variables
1879 that have been deferred until this point, but which are required.
1880 Returns non-zero if anything was put out. */
1883 wrapup_global_declarations (vec
, len
)
1890 int output_something
= 0;
1892 for (i
= 0; i
< len
; i
++)
1896 /* We're not deferring this any longer. */
1897 DECL_DEFER_OUTPUT (decl
) = 0;
1899 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1900 && incomplete_decl_finalize_hook
!= 0)
1901 (*incomplete_decl_finalize_hook
) (decl
);
1904 /* Now emit any global variables or functions that we have been
1905 putting off. We need to loop in case one of the things emitted
1906 here references another one which comes earlier in the list. */
1910 for (i
= 0; i
< len
; i
++)
1914 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1917 /* Don't write out static consts, unless we still need them.
1919 We also keep static consts if not optimizing (for debugging),
1920 unless the user specified -fno-keep-static-consts.
1921 ??? They might be better written into the debug information.
1922 This is possible when using DWARF.
1924 A language processor that wants static constants to be always
1925 written out (even if it is not used) is responsible for
1926 calling rest_of_decl_compilation itself. E.g. the C front-end
1927 calls rest_of_decl_compilation from finish_decl.
1928 One motivation for this is that is conventional in some
1929 environments to write things like:
1930 static const char rcsid[] = "... version string ...";
1931 intending to force the string to be in the executable.
1933 A language processor that would prefer to have unneeded
1934 static constants "optimized away" would just defer writing
1935 them out until here. E.g. C++ does this, because static
1936 constants are often defined in header files.
1938 ??? A tempting alternative (for both C and C++) would be
1939 to force a constant to be written if and only if it is
1940 defined in a main file, as opposed to an include file. */
1942 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1943 && (! TREE_READONLY (decl
)
1944 || TREE_PUBLIC (decl
)
1946 && flag_keep_static_consts
1947 && !DECL_ARTIFICIAL (decl
))
1948 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1951 rest_of_decl_compilation (decl
, NULL_PTR
, 1, 1);
1954 if (TREE_CODE (decl
) == FUNCTION_DECL
1955 && DECL_INITIAL (decl
) != 0
1956 && DECL_SAVED_INSNS (decl
) != 0
1957 && (flag_keep_inline_functions
1958 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1959 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1962 output_inline_function (decl
);
1967 output_something
= 1;
1971 return output_something
;
1974 /* Issue appropriate warnings for the global declarations in VEC (of
1975 which there are LEN). Output debugging information for them. */
1978 check_global_declarations (vec
, len
)
1985 for (i
= 0; i
< len
; i
++)
1989 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1990 && ! TREE_ASM_WRITTEN (decl
))
1991 /* Cancel the RTL for this decl so that, if debugging info
1992 output for global variables is still to come,
1993 this one will be omitted. */
1994 DECL_RTL (decl
) = NULL
;
1996 /* Warn about any function
1997 declared static but not defined.
1998 We don't warn about variables,
1999 because many programs have static variables
2000 that exist only to get some text into the object file. */
2001 if (TREE_CODE (decl
) == FUNCTION_DECL
2002 && (warn_unused_function
2003 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2004 && DECL_INITIAL (decl
) == 0
2005 && DECL_EXTERNAL (decl
)
2006 && ! DECL_ARTIFICIAL (decl
)
2007 && ! TREE_PUBLIC (decl
))
2009 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2010 pedwarn_with_decl (decl
,
2011 "`%s' used but never defined");
2013 warning_with_decl (decl
,
2014 "`%s' declared `static' but never defined");
2015 /* This symbol is effectively an "extern" declaration now. */
2016 TREE_PUBLIC (decl
) = 1;
2017 assemble_external (decl
);
2020 /* Warn about static fns or vars defined but not used,
2021 but not about inline functions or static consts
2022 since defining those in header files is normal practice. */
2023 if (((warn_unused_function
2024 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2025 || (warn_unused_variable
2026 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2027 && ! DECL_IN_SYSTEM_HEADER (decl
)
2028 && ! DECL_EXTERNAL (decl
)
2029 && ! TREE_PUBLIC (decl
)
2030 && ! TREE_USED (decl
)
2031 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2032 /* The TREE_USED bit for file-scope decls
2033 is kept in the identifier, to handle multiple
2034 external decls in different scopes. */
2035 && ! TREE_USED (DECL_NAME (decl
)))
2036 warning_with_decl (decl
, "`%s' defined but not used");
2038 timevar_push (TV_SYMOUT
);
2039 #ifdef SDB_DEBUGGING_INFO
2040 /* The COFF linker can move initialized global vars to the end.
2041 And that can screw up the symbol ordering.
2042 By putting the symbols in that order to begin with,
2043 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2044 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2045 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2046 && ! DECL_EXTERNAL (decl
)
2047 && DECL_RTL (decl
) != 0)
2048 sdbout_symbol (decl
, 0);
2050 /* Output COFF information for non-global
2051 file-scope initialized variables. */
2052 if (write_symbols
== SDB_DEBUG
2053 && TREE_CODE (decl
) == VAR_DECL
2054 && DECL_INITIAL (decl
)
2055 && ! DECL_EXTERNAL (decl
)
2056 && DECL_RTL (decl
) != 0
2057 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2058 sdbout_toplevel_data (decl
);
2059 #endif /* SDB_DEBUGGING_INFO */
2060 #ifdef DWARF_DEBUGGING_INFO
2061 /* Output DWARF information for file-scope tentative data object
2062 declarations, file-scope (extern) function declarations (which
2063 had no corresponding body) and file-scope tagged type declarations
2064 and definitions which have not yet been forced out. */
2066 if (write_symbols
== DWARF_DEBUG
2067 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2068 dwarfout_file_scope_decl (decl
, 1);
2070 #ifdef DWARF2_DEBUGGING_INFO
2071 /* Output DWARF2 information for file-scope tentative data object
2072 declarations, file-scope (extern) function declarations (which
2073 had no corresponding body) and file-scope tagged type declarations
2074 and definitions which have not yet been forced out. */
2076 if (write_symbols
== DWARF2_DEBUG
2077 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2078 dwarf2out_decl (decl
);
2080 timevar_pop (TV_SYMOUT
);
2084 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2085 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2086 INPUT_FILENAME and LINENO accordingly. */
2089 push_srcloc (file
, line
)
2093 struct file_stack
*fs
;
2095 if (input_file_stack
)
2097 input_file_stack
->name
= input_filename
;
2098 input_file_stack
->line
= lineno
;
2101 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2102 fs
->name
= input_filename
= file
;
2103 fs
->line
= lineno
= line
;
2104 fs
->indent_level
= 0;
2105 fs
->next
= input_file_stack
;
2106 input_file_stack
= fs
;
2107 input_file_stack_tick
++;
2110 /* Pop the top entry off the stack of presently open source files.
2111 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2117 struct file_stack
*fs
;
2119 fs
= input_file_stack
;
2120 input_file_stack
= fs
->next
;
2122 input_file_stack_tick
++;
2123 /* The initial source file is never popped. */
2124 if (!input_file_stack
)
2126 input_filename
= input_file_stack
->name
;
2127 lineno
= input_file_stack
->line
;
2130 /* Compile an entire file of output from cpp, named NAME.
2131 Write a file of assembly output and various debugging dumps. */
2139 int name_specified
= name
!= 0;
2141 if (dump_base_name
== 0)
2142 dump_base_name
= name
? name
: "gccdump";
2147 /* Start timing total execution time. */
2150 timevar_start (TV_TOTAL
);
2152 /* Initialize data in various passes. */
2155 name
= init_parse (name
);
2156 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2157 || debug_info_level
== DINFO_LEVEL_VERBOSE
2158 || flag_test_coverage
2159 || warn_notreached
);
2162 init_decl_processing ();
2168 init_function_once ();
2169 init_stor_layout_once ();
2170 init_varasm_once ();
2172 /* The following initialization functions need to generate rtl, so
2173 provide a dummy function context for them. */
2174 init_dummy_function_start ();
2177 if (flag_caller_saves
)
2178 init_caller_save ();
2179 expand_dummy_function_end ();
2181 /* If auxiliary info generation is desired, open the output file.
2182 This goes in the same directory as the source file--unlike
2183 all the other output files. */
2184 if (flag_gen_aux_info
)
2186 aux_info_file
= fopen (aux_info_file_name
, "w");
2187 if (aux_info_file
== 0)
2188 fatal_io_error ("can't open %s", aux_info_file_name
);
2191 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2192 because then the driver will have provided the name of a temporary
2193 file or bit bucket for us. */
2195 if (! name_specified
&& asm_file_name
== 0)
2196 asm_out_file
= stdout
;
2199 if (asm_file_name
== 0)
2201 int len
= strlen (dump_base_name
);
2202 char *dumpname
= (char *) xmalloc (len
+ 6);
2203 memcpy (dumpname
, dump_base_name
, len
+ 1);
2204 strip_off_ending (dumpname
, len
);
2205 strcat (dumpname
, ".s");
2206 asm_file_name
= dumpname
;
2208 if (!strcmp (asm_file_name
, "-"))
2209 asm_out_file
= stdout
;
2211 asm_out_file
= fopen (asm_file_name
, "w");
2212 if (asm_out_file
== 0)
2213 fatal_io_error ("can't open %s for writing", asm_file_name
);
2216 #ifdef IO_BUFFER_SIZE
2217 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2218 _IOFBF
, IO_BUFFER_SIZE
);
2222 name
= ggc_strdup (name
);
2224 input_filename
= name
;
2226 /* Put an entry on the input file stack for the main input file. */
2227 push_srcloc (input_filename
, 0);
2229 /* Perform language-specific initialization.
2230 This may set main_input_filename. */
2231 if (lang_hooks
.init
)
2232 (*lang_hooks
.init
) ();
2234 /* If the input doesn't start with a #line, use the input name
2235 as the official input file name. */
2236 if (main_input_filename
== 0)
2237 main_input_filename
= name
;
2239 if (flag_syntax_only
)
2241 write_symbols
= NO_DEBUG
;
2243 profile_block_flag
= 0;
2247 ASM_FILE_START (asm_out_file
);
2249 #ifdef ASM_COMMENT_START
2250 if (flag_verbose_asm
)
2252 /* Print the list of options in effect. */
2253 print_version (asm_out_file
, ASM_COMMENT_START
);
2254 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2255 ASM_COMMENT_START
, " ", "\n");
2256 /* Add a blank line here so it appears in assembler output but not
2258 fprintf (asm_out_file
, "\n");
2262 /* Output something to inform GDB that this compilation was by GCC. */
2263 #ifndef ASM_IDENTIFY_GCC
2264 fprintf (asm_out_file
, "gcc2_compiled.:\n");
2266 ASM_IDENTIFY_GCC (asm_out_file
);
2269 /* Output something to identify which front-end produced this file. */
2270 #ifdef ASM_IDENTIFY_LANGUAGE
2271 ASM_IDENTIFY_LANGUAGE (asm_out_file
);
2273 } /* ! flag_syntax_only */
2275 #ifndef ASM_OUTPUT_SECTION_NAME
2276 if (flag_function_sections
)
2278 warning ("-ffunction-sections not supported for this target.");
2279 flag_function_sections
= 0;
2281 if (flag_data_sections
)
2283 warning ("-fdata-sections not supported for this target.");
2284 flag_data_sections
= 0;
2288 if (flag_function_sections
2289 && (profile_flag
|| profile_block_flag
))
2291 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2292 flag_function_sections
= 0;
2295 #ifndef OBJECT_FORMAT_ELF
2296 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2297 warning ("-ffunction-sections may affect debugging on some targets.");
2300 /* ??? Note: There used to be a conditional here
2301 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2302 This was to guarantee separation between gcc_compiled. and
2303 the first function, for the sake of dbx on Suns.
2304 However, having the extra zero here confused the Emacs
2305 code for unexec, and might confuse other programs too.
2306 Therefore, I took out that change.
2307 In future versions we should find another way to solve
2308 that dbx problem. -- rms, 23 May 93. */
2310 /* Don't let the first function fall at the same address
2311 as gcc_compiled., if profiling. */
2312 if (profile_flag
|| profile_block_flag
)
2314 /* It's best if we can write a nop here since some
2315 assemblers don't tolerate zeros in the text section. */
2316 output_asm_insn (get_insn_template (CODE_FOR_nop
, NULL
), NULL_PTR
);
2319 /* If dbx symbol table desired, initialize writing it
2320 and output the predefined types. */
2321 timevar_push (TV_SYMOUT
);
2322 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2323 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2324 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2326 #ifdef SDB_DEBUGGING_INFO
2327 if (write_symbols
== SDB_DEBUG
)
2328 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2330 #ifdef DWARF_DEBUGGING_INFO
2331 if (write_symbols
== DWARF_DEBUG
)
2332 dwarfout_init (asm_out_file
, main_input_filename
);
2334 #ifdef DWARF2_UNWIND_INFO
2335 if (dwarf2out_do_frame ())
2336 dwarf2out_frame_init ();
2338 #ifdef DWARF2_DEBUGGING_INFO
2339 if (write_symbols
== DWARF2_DEBUG
)
2340 dwarf2out_init (asm_out_file
, main_input_filename
);
2342 timevar_pop (TV_SYMOUT
);
2344 /* Initialize yet another pass. */
2346 init_final (main_input_filename
);
2347 init_branch_prob (dump_base_name
);
2349 timevar_push (TV_PARSE
);
2351 /* Call the parser, which parses the entire file
2352 (calling rest_of_compilation for each function). */
2354 if (yyparse () != 0)
2356 if (errorcount
== 0)
2357 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2359 /* In case there were missing closebraces,
2360 get us back to the global binding level. */
2361 while (! global_bindings_p ())
2365 /* Compilation is now finished except for writing
2366 what's left of the symbol table output. */
2368 timevar_pop (TV_PARSE
);
2370 if (flag_syntax_only
)
2373 globals
= getdecls ();
2375 /* Really define vars that have had only a tentative definition.
2376 Really output inline functions that must actually be callable
2377 and have not been output so far. */
2380 int len
= list_length (globals
);
2381 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2385 /* Process the decls in reverse order--earliest first.
2386 Put them into VEC from back to front, then take out from front. */
2388 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2389 vec
[len
- i
- 1] = decl
;
2391 wrapup_global_declarations (vec
, len
);
2393 /* This must occur after the loop to output deferred functions. Else
2394 the profiler initializer would not be emitted if all the functions
2395 in this compilation unit were deferred.
2397 output_func_start_profiler can not cause any additional functions or
2398 data to need to be output, so it need not be in the deferred function
2400 output_func_start_profiler ();
2402 /* Now that all possible functions have been output, we can dump
2403 the exception table. */
2405 #ifndef IA64_UNWIND_INFO
2406 output_exception_table ();
2408 free_exception_table ();
2410 check_global_declarations (vec
, len
);
2416 /* Write out any pending weak symbol declarations. */
2420 /* Do dbx symbols. */
2421 timevar_push (TV_SYMOUT
);
2422 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2423 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2424 dbxout_finish (asm_out_file
, main_input_filename
);
2427 #ifdef DWARF_DEBUGGING_INFO
2428 if (write_symbols
== DWARF_DEBUG
)
2432 #ifdef DWARF2_UNWIND_INFO
2433 if (dwarf2out_do_frame ())
2434 dwarf2out_frame_finish ();
2437 #ifdef DWARF2_DEBUGGING_INFO
2438 if (write_symbols
== DWARF2_DEBUG
)
2439 dwarf2out_finish ();
2441 timevar_pop (TV_SYMOUT
);
2443 /* Output some stuff at end of file if nec. */
2445 end_final (dump_base_name
);
2447 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2449 timevar_push (TV_DUMP
);
2450 open_dump_file (DFI_bp
, NULL
);
2454 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2455 timevar_pop (TV_DUMP
);
2459 ASM_FILE_END (asm_out_file
);
2462 /* Language-specific end of compilation actions. */
2464 if (lang_hooks
.finish
)
2465 (*lang_hooks
.finish
) ();
2467 /* Close the dump files. */
2469 if (flag_gen_aux_info
)
2471 fclose (aux_info_file
);
2473 unlink (aux_info_file_name
);
2476 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2478 timevar_push (TV_DUMP
);
2479 dump_combine_total_stats (rtl_dump_file
);
2480 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2481 timevar_pop (TV_DUMP
);
2484 /* Close non-debugging input and output files. Take special care to note
2485 whether fclose returns an error, since the pages might still be on the
2486 buffer chain while the file is open. */
2490 if (ferror (asm_out_file
) != 0)
2491 fatal_io_error ("error writing to %s", asm_file_name
);
2492 if (fclose (asm_out_file
) != 0)
2493 fatal_io_error ("error closing %s", asm_file_name
);
2495 /* Do whatever is necessary to finish printing the graphs. */
2496 if (graph_dump_format
!= no_graph
)
2500 for (i
= 0; i
< DFI_MAX
; ++i
)
2501 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2506 sprintf (seq
, ".%02d.", i
);
2507 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2508 finish_graph_dump_file (dump_base_name
, suffix
);
2515 ggc_print_statistics ();
2516 stringpool_statistics ();
2519 /* Free up memory for the benefit of leak detectors. */
2522 /* Stop timing total execution time. */
2523 timevar_stop (TV_TOTAL
);
2525 /* Print the times. */
2527 timevar_print (stderr
);
2530 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2531 and TYPE_DECL nodes.
2533 This does nothing for local (non-static) variables, unless the
2534 variable is a register variable with an ASMSPEC. In that case, or
2535 if the variable is not an automatice, it sets up the RTL and
2536 outputs any assembler code (label definition, storage allocation
2537 and initialization).
2539 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2540 the assembler symbol name to be used. TOP_LEVEL is nonzero
2541 if this declaration is not within a function. */
2544 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2546 const char *asmspec
;
2550 /* Declarations of variables, and of functions defined elsewhere. */
2552 /* The most obvious approach, to put an #ifndef around where
2553 this macro is used, doesn't work since it's inside a macro call. */
2554 #ifndef ASM_FINISH_DECLARE_OBJECT
2555 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2558 /* Forward declarations for nested functions are not "external",
2559 but we need to treat them as if they were. */
2560 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2561 || TREE_CODE (decl
) == FUNCTION_DECL
)
2563 timevar_push (TV_VARCONST
);
2564 make_decl_rtl (decl
, asmspec
);
2565 /* Initialized extern variable exists to be replaced
2566 with its value, or represents something that will be
2567 output in another file. */
2568 if (! (TREE_CODE (decl
) == VAR_DECL
2569 && DECL_EXTERNAL (decl
) && TREE_READONLY (decl
)
2570 && DECL_INITIAL (decl
) != 0
2571 && DECL_INITIAL (decl
) != error_mark_node
))
2572 /* Don't output anything
2573 when a tentative file-scope definition is seen.
2574 But at end of compilation, do output code for them. */
2575 if (! (! at_end
&& top_level
2576 && (DECL_INITIAL (decl
) == 0
2577 || DECL_INITIAL (decl
) == error_mark_node
)))
2578 assemble_variable (decl
, top_level
, at_end
, 0);
2579 if (decl
== last_assemble_variable_decl
)
2581 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2584 timevar_pop (TV_VARCONST
);
2586 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2588 if (decode_reg_name (asmspec
) >= 0)
2590 DECL_RTL (decl
) = 0;
2591 make_decl_rtl (decl
, asmspec
);
2595 error ("invalid register name `%s' for register variable", asmspec
);
2596 DECL_REGISTER (decl
) = 0;
2597 make_decl_rtl (decl
, NULL
);
2600 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2601 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2602 && TREE_CODE (decl
) == TYPE_DECL
)
2604 timevar_push (TV_SYMOUT
);
2605 dbxout_symbol (decl
, 0);
2606 timevar_pop (TV_SYMOUT
);
2609 #ifdef SDB_DEBUGGING_INFO
2610 else if (write_symbols
== SDB_DEBUG
&& top_level
2611 && TREE_CODE (decl
) == TYPE_DECL
)
2613 timevar_push (TV_SYMOUT
);
2614 sdbout_symbol (decl
, 0);
2615 timevar_pop (TV_SYMOUT
);
2620 /* Called after finishing a record, union or enumeral type. */
2623 rest_of_type_compilation (type
, toplev
)
2624 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2628 tree type ATTRIBUTE_UNUSED
;
2629 int toplev ATTRIBUTE_UNUSED
;
2632 timevar_push (TV_SYMOUT
);
2633 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2634 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2635 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2637 #ifdef SDB_DEBUGGING_INFO
2638 if (write_symbols
== SDB_DEBUG
)
2639 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2641 #ifdef DWARF2_DEBUGGING_INFO
2642 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2643 dwarf2out_decl (TYPE_STUB_DECL (type
));
2645 timevar_pop (TV_SYMOUT
);
2648 /* DECL is an inline function, whose body is present, but which is not
2649 being output at this point. (We're putting that off until we need
2650 to do it.) If there are any actions that need to take place,
2651 including the emission of debugging information for the function,
2652 this is where they should go. This function may be called by
2653 language-dependent code for front-ends that do not even generate
2654 RTL for functions that don't need to be put out. */
2657 note_deferral_of_defined_inline_function (decl
)
2658 tree decl ATTRIBUTE_UNUSED
;
2660 #ifdef DWARF_DEBUGGING_INFO
2661 /* Generate the DWARF info for the "abstract" instance of a function
2662 which we may later generate inlined and/or out-of-line instances
2664 if (write_symbols
== DWARF_DEBUG
&& DECL_INLINE (decl
))
2666 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2667 DWARF code expects it to be set in this case. Intuitively,
2668 DECL is the function we just finished defining, so setting
2669 CURRENT_FUNCTION_DECL is sensible. */
2670 tree saved_cfd
= current_function_decl
;
2671 current_function_decl
= decl
;
2673 /* Let the DWARF code do its work. */
2674 set_decl_abstract_flags (decl
, 1);
2675 dwarfout_file_scope_decl (decl
, 0);
2676 set_decl_abstract_flags (decl
, 0);
2678 /* Reset CURRENT_FUNCTION_DECL. */
2679 current_function_decl
= saved_cfd
;
2684 /* FNDECL is an inline function which is about to be emitted out of line.
2685 Do any preparation, such as emitting abstract debug info for the inline
2686 before it gets mangled by optimization. */
2689 note_outlining_of_inline_function (fndecl
)
2690 tree fndecl ATTRIBUTE_UNUSED
;
2692 #ifdef DWARF2_DEBUGGING_INFO
2693 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2694 the abstract description of inline functions until something tries to
2695 reference them. Force it out now, before optimizations mangle the
2697 if (write_symbols
== DWARF2_DEBUG
)
2698 dwarf2out_abstract_function (fndecl
);
2702 /* This is called from finish_function (within yyparse)
2703 after each top-level definition is parsed.
2704 It is supposed to compile that function or variable
2705 and output the assembler code for it.
2706 After we return, the tree storage is freed. */
2709 rest_of_compilation (decl
)
2715 int rebuild_label_notes_after_reload
;
2716 int register_life_up_to_date
;
2718 timevar_push (TV_REST_OF_COMPILATION
);
2720 /* Now that we're out of the frontend, we shouldn't have any more
2721 CONCATs anywhere. */
2722 generating_concat_p
= 0;
2724 /* When processing delayed functions, prepare_function_start() won't
2725 have been run to re-initialize it. */
2726 cse_not_expected
= ! optimize
;
2728 /* First, make sure that NOTE_BLOCK is set correctly for each
2729 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2730 if (!cfun
->x_whole_function_mode_p
)
2733 /* Then remove any notes we don't need. That will make iterating
2734 over the instruction sequence faster, and allow the garbage
2735 collector to reclaim the memory used by the notes. */
2736 remove_unnecessary_notes ();
2738 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2739 tree in sensible shape. So, we just recalculate it here. */
2740 if (cfun
->x_whole_function_mode_p
)
2745 /* If we are reconsidering an inline function
2746 at the end of compilation, skip the stuff for making it inline. */
2748 if (DECL_SAVED_INSNS (decl
) == 0)
2754 /* If this is nested inside an inlined external function, pretend
2755 it was only declared. Since we cannot inline such functions,
2756 generating code for this one is not only not necessary but will
2757 confuse some debugging output writers. */
2758 for (parent
= DECL_CONTEXT (current_function_decl
);
2759 parent
!= NULL_TREE
;
2760 parent
= get_containing_scope (parent
))
2761 if (TREE_CODE (parent
) == FUNCTION_DECL
2762 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2764 DECL_INITIAL (decl
) = 0;
2765 goto exit_rest_of_compilation
;
2768 /* If requested, consider whether to make this function inline. */
2769 if (DECL_INLINE (decl
) || flag_inline_functions
)
2771 timevar_push (TV_INTEGRATION
);
2772 lose
= function_cannot_inline_p (decl
);
2773 timevar_pop (TV_INTEGRATION
);
2774 if (lose
|| ! optimize
)
2776 if (warn_inline
&& DECL_INLINE (decl
))
2777 warning_with_decl (decl
, lose
);
2778 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2779 /* Don't really compile an extern inline function.
2780 If we can't make it inline, pretend
2781 it was only declared. */
2782 if (DECL_EXTERNAL (decl
))
2784 DECL_INITIAL (decl
) = 0;
2785 goto exit_rest_of_compilation
;
2789 /* ??? Note that this has the effect of making it look
2790 like "inline" was specified for a function if we choose
2791 to inline it. This isn't quite right, but it's
2792 probably not worth the trouble to fix. */
2793 inlinable
= DECL_INLINE (decl
) = 1;
2796 insns
= get_insns ();
2798 /* Dump the rtl code if we are dumping rtl. */
2800 if (open_dump_file (DFI_rtl
, decl
))
2802 if (DECL_SAVED_INSNS (decl
))
2803 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2804 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2807 /* If function is inline, and we don't yet know whether to
2808 compile it by itself, defer decision till end of compilation.
2809 finish_compilation will call rest_of_compilation again
2810 for those functions that need to be output. Also defer those
2811 functions that we are supposed to defer. */
2814 || (DECL_INLINE (decl
)
2815 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2816 && ! flag_keep_inline_functions
)
2817 || DECL_EXTERNAL (decl
))))
2818 DECL_DEFER_OUTPUT (decl
) = 1;
2820 if (DECL_INLINE (decl
))
2821 /* DWARF wants seperate debugging info for abstract and
2822 concrete instances of all inline functions, including those
2823 declared inline but not inlined, and those inlined even
2824 though they weren't declared inline. Conveniently, that's
2825 what DECL_INLINE means at this point. */
2826 note_deferral_of_defined_inline_function (decl
);
2828 if (DECL_DEFER_OUTPUT (decl
))
2830 /* If -Wreturn-type, we have to do a bit of compilation. We just
2831 want to call jump_optimize to figure out whether or not we can
2832 fall off the end of the function; we do the minimum amount of
2833 work necessary to make that safe. And, we set optimize to zero
2834 to keep jump_optimize from working too hard. */
2835 if (warn_return_type
)
2837 int saved_optimize
= optimize
;
2840 find_exception_handler_labels ();
2841 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2842 !JUMP_AFTER_REGSCAN
);
2843 optimize
= saved_optimize
;
2846 current_function_nothrow
= nothrow_function_p ();
2847 if (current_function_nothrow
)
2848 /* Now we know that this can't throw; set the flag for the benefit
2849 of other functions later in this translation unit. */
2850 TREE_NOTHROW (current_function_decl
) = 1;
2852 timevar_push (TV_INTEGRATION
);
2853 save_for_inline (decl
);
2854 timevar_pop (TV_INTEGRATION
);
2855 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2856 goto exit_rest_of_compilation
;
2859 /* If specified extern inline but we aren't inlining it, we are
2860 done. This goes for anything that gets here with DECL_EXTERNAL
2861 set, not just things with DECL_INLINE. */
2862 if (DECL_EXTERNAL (decl
))
2863 goto exit_rest_of_compilation
;
2866 init_EXPR_INSN_LIST_cache ();
2870 /* Initialize some variables used by the optimizers. */
2871 init_function_for_compilation ();
2873 if (! DECL_DEFER_OUTPUT (decl
))
2874 TREE_ASM_WRITTEN (decl
) = 1;
2876 /* Now that integrate will no longer see our rtl, we need not
2877 distinguish between the return value of this function and the
2878 return value of called functions. Also, we can remove all SETs
2879 of subregs of hard registers; they are only here because of
2881 rtx_equal_function_value_matters
= 0;
2882 purge_hard_subreg_sets (get_insns ());
2884 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2885 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2886 goto exit_rest_of_compilation
;
2888 /* Emit code to get eh context, if needed. */
2891 /* We may have potential sibling or tail recursion sites. Select one
2892 (of possibly multiple) methods of performing the call. */
2893 if (flag_optimize_sibling_calls
)
2895 timevar_push (TV_JUMP
);
2896 open_dump_file (DFI_sibling
, decl
);
2898 optimize_sibling_and_tail_recursive_calls ();
2900 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2901 timevar_pop (TV_JUMP
);
2905 /* If we are doing position-independent code generation, now
2906 is the time to output special prologues and epilogues.
2907 We do not want to do this earlier, because it just clutters
2908 up inline functions with meaningless insns. */
2913 insns
= get_insns ();
2915 /* Copy any shared structure that should not be shared. */
2916 unshare_all_rtl (current_function_decl
, insns
);
2918 #ifdef SETJMP_VIA_SAVE_AREA
2919 /* This must be performed before virutal register instantiation. */
2920 if (current_function_calls_alloca
)
2921 optimize_save_area_alloca (insns
);
2924 /* Instantiate all virtual registers. */
2925 instantiate_virtual_regs (current_function_decl
, insns
);
2927 /* Find all the EH handlers. */
2928 find_exception_handler_labels ();
2930 open_dump_file (DFI_jump
, decl
);
2932 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2933 are initialized and to compute whether control can drop off the end
2936 timevar_push (TV_JUMP
);
2937 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2938 before jump optimization switches branch directions. */
2939 expected_value_to_br_prob ();
2941 reg_scan (insns
, max_reg_num (), 0);
2942 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2943 JUMP_AFTER_REGSCAN
);
2945 timevar_pop (TV_JUMP
);
2947 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2948 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2950 close_dump_file (DFI_jump
, print_rtl
, insns
);
2951 goto exit_rest_of_compilation
;
2954 timevar_push (TV_JUMP
);
2958 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2959 cleanup_cfg (insns
);
2961 /* ??? Run if-conversion before delete_null_pointer_checks,
2962 since the later does not preserve the CFG. This should
2963 be changed -- no since converting if's that are going to
2965 timevar_push (TV_IFCVT
);
2967 timevar_pop (TV_IFCVT
);
2969 /* Try to identify useless null pointer tests and delete them. */
2970 if (flag_delete_null_pointer_checks
)
2971 delete_null_pointer_checks (insns
);
2974 /* Jump optimization, and the removal of NULL pointer checks, may
2975 have reduced the number of instructions substantially. CSE, and
2976 future passes, allocate arrays whose dimensions involve the
2977 maximum instruction UID, so if we can reduce the maximum UID
2978 we'll save big on memory. */
2979 renumber_insns (rtl_dump_file
);
2980 timevar_pop (TV_JUMP
);
2982 close_dump_file (DFI_jump
, print_rtl
, insns
);
2986 /* Perform common subexpression elimination.
2987 Nonzero value from `cse_main' means that jumps were simplified
2988 and some code may now be unreachable, so do
2989 jump optimization again. */
2993 open_dump_file (DFI_cse
, decl
);
2994 timevar_push (TV_CSE
);
2996 reg_scan (insns
, max_reg_num (), 1);
2998 if (flag_thread_jumps
)
3000 timevar_push (TV_JUMP
);
3001 thread_jumps (insns
, max_reg_num (), 1);
3002 timevar_pop (TV_JUMP
);
3005 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3007 /* If we are not running more CSE passes, then we are no longer
3008 expecting CSE to be run. But always rerun it in a cheap mode. */
3009 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3010 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3012 if (tem
|| optimize
> 1)
3014 timevar_push (TV_JUMP
);
3015 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3016 !JUMP_AFTER_REGSCAN
);
3017 timevar_pop (TV_JUMP
);
3020 /* Run this after jump optmizations remove all the unreachable code
3021 so that unreachable code will not keep values live. */
3022 delete_trivially_dead_insns (insns
, max_reg_num ());
3024 /* Try to identify useless null pointer tests and delete them. */
3025 if (flag_delete_null_pointer_checks
)
3027 timevar_push (TV_JUMP
);
3028 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3030 cleanup_cfg (insns
);
3032 delete_null_pointer_checks (insns
);
3033 timevar_pop (TV_JUMP
);
3036 /* The second pass of jump optimization is likely to have
3037 removed a bunch more instructions. */
3038 renumber_insns (rtl_dump_file
);
3040 timevar_pop (TV_CSE
);
3041 close_dump_file (DFI_cse
, print_rtl
, insns
);
3044 open_dump_file (DFI_addressof
, decl
);
3046 purge_addressof (insns
);
3047 reg_scan (insns
, max_reg_num (), 1);
3049 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3053 if (optimize
> 0 && flag_ssa
)
3055 /* Convert to SSA form. */
3057 timevar_push (TV_TO_SSA
);
3058 open_dump_file (DFI_ssa
, decl
);
3060 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3061 cleanup_cfg (insns
);
3064 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3065 timevar_pop (TV_TO_SSA
);
3067 /* The SSA implementation uses basic block numbers in its phi
3068 nodes. Thus, changing the control-flow graph or the basic
3069 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3070 may cause problems. */
3074 /* Remove dead code. */
3076 timevar_push (TV_DEAD_CODE_ELIM
);
3077 open_dump_file (DFI_dce
, decl
);
3079 insns
= get_insns ();
3080 eliminate_dead_code();
3082 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3083 timevar_pop (TV_DEAD_CODE_ELIM
);
3086 /* Convert from SSA form. */
3088 timevar_push (TV_FROM_SSA
);
3089 open_dump_file (DFI_ussa
, decl
);
3091 convert_from_ssa ();
3092 /* New registers have been created. Rescan their usage. */
3093 reg_scan (insns
, max_reg_num (), 1);
3094 /* Life analysis used in SSA adds log_links but these
3095 shouldn't be there until the flow stage, so clear
3097 clear_log_links (insns
);
3099 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3100 timevar_pop (TV_FROM_SSA
);
3105 /* Perform global cse. */
3107 if (optimize
> 0 && flag_gcse
)
3111 timevar_push (TV_GCSE
);
3112 open_dump_file (DFI_gcse
, decl
);
3114 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3115 cleanup_cfg (insns
);
3116 tem
= gcse_main (insns
, rtl_dump_file
);
3118 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3120 if (flag_expensive_optimizations
)
3122 timevar_push (TV_CSE
);
3123 reg_scan (insns
, max_reg_num (), 1);
3124 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3125 timevar_pop (TV_CSE
);
3126 cse_not_expected
= !flag_rerun_cse_after_loop
;
3129 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3130 things up. Then possibly re-run CSE again. */
3134 timevar_push (TV_JUMP
);
3135 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3136 !JUMP_AFTER_REGSCAN
);
3137 timevar_pop (TV_JUMP
);
3139 if (flag_expensive_optimizations
)
3141 timevar_push (TV_CSE
);
3142 reg_scan (insns
, max_reg_num (), 1);
3143 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3144 timevar_pop (TV_CSE
);
3148 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3149 timevar_pop (TV_GCSE
);
3154 /* Move constant computations out of loops. */
3158 timevar_push (TV_LOOP
);
3159 open_dump_file (DFI_loop
, decl
);
3161 if (flag_rerun_loop_opt
)
3163 /* We only want to perform unrolling once. */
3165 loop_optimize (insns
, rtl_dump_file
, 0);
3167 /* The first call to loop_optimize makes some instructions
3168 trivially dead. We delete those instructions now in the
3169 hope that doing so will make the heuristics in loop work
3170 better and possibly speed up compilation. */
3171 delete_trivially_dead_insns (insns
, max_reg_num ());
3173 /* The regscan pass is currently necessary as the alias
3174 analysis code depends on this information. */
3175 reg_scan (insns
, max_reg_num (), 1);
3177 loop_optimize (insns
, rtl_dump_file
,
3178 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3180 close_dump_file (DFI_loop
, print_rtl
, insns
);
3181 timevar_pop (TV_LOOP
);
3188 timevar_push (TV_CSE2
);
3189 open_dump_file (DFI_cse2
, decl
);
3191 if (flag_rerun_cse_after_loop
)
3193 /* Running another jump optimization pass before the second
3194 cse pass sometimes simplifies the RTL enough to allow
3195 the second CSE pass to do a better job. Jump_optimize can change
3196 max_reg_num so we must rerun reg_scan afterwards.
3197 ??? Rework to not call reg_scan so often. */
3198 timevar_push (TV_JUMP
);
3200 reg_scan (insns
, max_reg_num (), 0);
3201 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3202 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3204 timevar_push (TV_IFCVT
);
3206 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3207 cleanup_cfg (insns
);
3210 timevar_pop(TV_IFCVT
);
3212 timevar_pop (TV_JUMP
);
3214 reg_scan (insns
, max_reg_num (), 0);
3215 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3219 timevar_push (TV_JUMP
);
3220 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3221 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3222 timevar_pop (TV_JUMP
);
3226 if (flag_thread_jumps
)
3228 /* This pass of jump threading straightens out code
3229 that was kinked by loop optimization. */
3230 timevar_push (TV_JUMP
);
3231 reg_scan (insns
, max_reg_num (), 0);
3232 thread_jumps (insns
, max_reg_num (), 0);
3233 timevar_pop (TV_JUMP
);
3236 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3237 timevar_pop (TV_CSE2
);
3242 cse_not_expected
= 1;
3246 /* Do control and data flow analysis; wrote some of the results to
3249 timevar_push (TV_FLOW
);
3250 open_dump_file (DFI_cfg
, decl
);
3252 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3253 cleanup_cfg (insns
);
3254 check_function_return_warnings ();
3256 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3258 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3260 timevar_push (TV_BRANCH_PROB
);
3261 open_dump_file (DFI_bp
, decl
);
3265 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3266 timevar_pop (TV_BRANCH_PROB
);
3269 open_dump_file (DFI_life
, decl
);
3274 /* Discover and record the loop depth at the head of each basic
3275 block. The loop infrastructure does the real job for us. */
3276 flow_loops_find (&loops
, LOOP_TREE
);
3278 /* Estimate using heuristics if no profiling info is available. */
3279 if (flag_guess_branch_prob
)
3280 estimate_probability (&loops
);
3283 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3285 flow_loops_free (&loops
);
3287 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3288 mark_constant_function ();
3289 timevar_pop (TV_FLOW
);
3291 register_life_up_to_date
= 1;
3294 if (warn_uninitialized
|| extra_warnings
)
3296 uninitialized_vars_warning (DECL_INITIAL (decl
));
3298 setjmp_args_warning ();
3301 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3305 /* If -opt, try combining insns through substitution. */
3309 int rebuild_jump_labels_after_combine
= 0;
3311 timevar_push (TV_COMBINE
);
3312 open_dump_file (DFI_combine
, decl
);
3314 rebuild_jump_labels_after_combine
3315 = combine_instructions (insns
, max_reg_num ());
3317 /* Combining insns may have turned an indirect jump into a
3318 direct jump. Rebuid the JUMP_LABEL fields of jumping
3320 if (rebuild_jump_labels_after_combine
)
3322 timevar_push (TV_JUMP
);
3323 rebuild_jump_labels (insns
);
3324 timevar_pop (TV_JUMP
);
3326 timevar_push (TV_FLOW
);
3327 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3328 cleanup_cfg (insns
);
3330 /* Blimey. We've got to have the CFG up to date for the call to
3331 if_convert below. However, the random deletion of blocks
3332 without updating life info can wind up with Wierd Stuff in
3333 global_live_at_end. We then run sched1, which updates things
3334 properly, discovers the wierdness and aborts. */
3335 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3336 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3337 | PROP_SCAN_DEAD_CODE
);
3339 timevar_pop (TV_FLOW
);
3342 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3343 timevar_pop (TV_COMBINE
);
3348 /* Rerun if-conversion, as combine may have simplified things enough to
3349 now meet sequence length restrictions. */
3352 timevar_push (TV_IFCVT
);
3353 open_dump_file (DFI_ce
, decl
);
3359 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3360 timevar_pop (TV_IFCVT
);
3363 /* Register allocation pre-pass, to reduce number of moves
3364 necessary for two-address machines. */
3365 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3367 timevar_push (TV_REGMOVE
);
3368 open_dump_file (DFI_regmove
, decl
);
3370 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3372 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3373 timevar_pop (TV_REGMOVE
);
3378 /* Any of the several passes since flow1 will have munged register
3379 lifetime data a bit. */
3381 register_life_up_to_date
= 0;
3383 #ifdef OPTIMIZE_MODE_SWITCHING
3384 timevar_push (TV_GCSE
);
3386 if (optimize_mode_switching (NULL_PTR
))
3388 /* We did work, and so had to regenerate global life information.
3389 Take advantage of this and don't re-recompute register life
3390 information below. */
3391 register_life_up_to_date
= 1;
3394 timevar_pop (TV_GCSE
);
3397 #ifdef INSN_SCHEDULING
3399 /* Print function header into sched dump now
3400 because doing the sched analysis makes some of the dump. */
3401 if (optimize
> 0 && flag_schedule_insns
)
3403 timevar_push (TV_SCHED
);
3404 open_dump_file (DFI_sched
, decl
);
3406 /* Do control and data sched analysis,
3407 and write some of the results to dump file. */
3409 schedule_insns (rtl_dump_file
);
3411 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3412 timevar_pop (TV_SCHED
);
3416 /* Register lifetime information was updated as part of verifying
3418 register_life_up_to_date
= 1;
3422 /* Determine if the current function is a leaf before running reload
3423 since this can impact optimizations done by the prologue and
3424 epilogue thus changing register elimination offsets. */
3425 current_function_is_leaf
= leaf_function_p ();
3427 timevar_push (TV_LOCAL_ALLOC
);
3428 open_dump_file (DFI_lreg
, decl
);
3430 /* Allocate pseudo-regs that are used only within 1 basic block.
3432 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3433 jump optimizer after register allocation and reloading are finished. */
3435 if (! register_life_up_to_date
)
3436 recompute_reg_usage (insns
, ! optimize_size
);
3437 regclass (insns
, max_reg_num (), rtl_dump_file
);
3438 rebuild_label_notes_after_reload
= local_alloc ();
3440 timevar_pop (TV_LOCAL_ALLOC
);
3442 if (dump_file
[DFI_lreg
].enabled
)
3444 timevar_push (TV_DUMP
);
3446 dump_flow_info (rtl_dump_file
);
3447 dump_local_alloc (rtl_dump_file
);
3449 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3450 timevar_pop (TV_DUMP
);
3455 timevar_push (TV_GLOBAL_ALLOC
);
3456 open_dump_file (DFI_greg
, decl
);
3458 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3459 pass fixing up any insns that are invalid. */
3462 failure
= global_alloc (rtl_dump_file
);
3465 build_insn_chain (insns
);
3466 failure
= reload (insns
, 0);
3469 timevar_pop (TV_GLOBAL_ALLOC
);
3471 if (dump_file
[DFI_greg
].enabled
)
3473 timevar_push (TV_DUMP
);
3475 dump_global_regs (rtl_dump_file
);
3477 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3478 timevar_pop (TV_DUMP
);
3482 goto exit_rest_of_compilation
;
3486 open_dump_file (DFI_postreload
, decl
);
3488 /* Do a very simple CSE pass over just the hard registers. */
3491 timevar_push (TV_RELOAD_CSE_REGS
);
3492 reload_cse_regs (insns
);
3493 timevar_pop (TV_RELOAD_CSE_REGS
);
3496 /* If optimizing, then go ahead and split insns now since we are about
3497 to recompute flow information anyway. */
3500 int old_labelnum
= max_label_num ();
3502 split_all_insns (0);
3503 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3506 /* Register allocation and reloading may have turned an indirect jump into
3507 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3508 jumping instructions. */
3509 if (rebuild_label_notes_after_reload
)
3511 timevar_push (TV_JUMP
);
3513 rebuild_jump_labels (insns
);
3515 timevar_pop (TV_JUMP
);
3518 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3520 /* Re-create the death notes which were deleted during reload. */
3521 timevar_push (TV_FLOW2
);
3522 open_dump_file (DFI_flow2
, decl
);
3524 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3525 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3526 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3528 /* On some machines, the prologue and epilogue code, or parts thereof,
3529 can be represented as RTL. Doing so lets us schedule insns between
3530 it and the rest of the code and also allows delayed branch
3531 scheduling to operate in the epilogue. */
3532 thread_prologue_and_epilogue_insns (insns
);
3536 cleanup_cfg (insns
);
3537 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3539 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3540 even for machines with possibly nonzero RETURN_POPS_ARGS
3541 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3542 push instructions will have popping returns. */
3543 #ifndef PUSH_ROUNDING
3544 if (!ACCUMULATE_OUTGOING_ARGS
)
3546 combine_stack_adjustments ();
3551 flow2_completed
= 1;
3553 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3554 timevar_pop (TV_FLOW2
);
3556 #ifdef HAVE_peephole2
3557 if (optimize
> 0 && flag_peephole2
)
3559 timevar_push (TV_PEEPHOLE2
);
3560 open_dump_file (DFI_peephole2
, decl
);
3562 peephole2_optimize (rtl_dump_file
);
3564 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3565 timevar_pop (TV_PEEPHOLE2
);
3569 if (optimize
> 0 && flag_rename_registers
)
3571 timevar_push (TV_RENAME_REGISTERS
);
3572 open_dump_file (DFI_rnreg
, decl
);
3574 regrename_optimize ();
3576 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3577 timevar_pop (TV_RENAME_REGISTERS
);
3582 timevar_push (TV_IFCVT2
);
3583 open_dump_file (DFI_ce2
, decl
);
3587 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3588 timevar_pop (TV_IFCVT2
);
3591 #ifdef INSN_SCHEDULING
3592 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3594 timevar_push (TV_SCHED2
);
3595 open_dump_file (DFI_sched2
, decl
);
3597 /* Do control and data sched analysis again,
3598 and write some more of the results to dump file. */
3600 schedule_insns (rtl_dump_file
);
3602 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3603 timevar_pop (TV_SCHED2
);
3609 #ifdef LEAF_REGISTERS
3610 current_function_uses_only_leaf_regs
3611 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3614 if (optimize
> 0 && flag_reorder_blocks
)
3616 timevar_push (TV_REORDER_BLOCKS
);
3617 open_dump_file (DFI_bbro
, decl
);
3619 reorder_basic_blocks ();
3621 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3622 timevar_pop (TV_REORDER_BLOCKS
);
3625 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3626 Also do cross-jumping this time and delete no-op move insns. */
3630 timevar_push (TV_JUMP
);
3631 open_dump_file (DFI_jump2
, decl
);
3633 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3634 !JUMP_AFTER_REGSCAN
);
3636 /* CFG no longer kept up to date. */
3638 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3639 timevar_pop (TV_JUMP
);
3642 /* If a machine dependent reorganization is needed, call it. */
3643 #ifdef MACHINE_DEPENDENT_REORG
3644 open_dump_file (DFI_mach
, decl
);
3646 MACHINE_DEPENDENT_REORG (insns
);
3648 close_dump_file (DFI_mach
, print_rtl
, insns
);
3653 /* If a scheduling pass for delayed branches is to be done,
3654 call the scheduling code. */
3657 if (optimize
> 0 && flag_delayed_branch
)
3659 timevar_push (TV_DBR_SCHED
);
3660 open_dump_file (DFI_dbr
, decl
);
3662 dbr_schedule (insns
, rtl_dump_file
);
3664 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3665 timevar_pop (TV_DBR_SCHED
);
3671 /* Shorten branches.
3673 Note this must run before reg-stack because of death note (ab)use
3674 in the ia32 backend. */
3675 timevar_push (TV_SHORTEN_BRANCH
);
3676 shorten_branches (get_insns ());
3677 timevar_pop (TV_SHORTEN_BRANCH
);
3680 timevar_push (TV_REG_STACK
);
3681 open_dump_file (DFI_stack
, decl
);
3683 reg_to_stack (insns
, rtl_dump_file
);
3685 close_dump_file (DFI_stack
, print_rtl
, insns
);
3686 timevar_pop (TV_REG_STACK
);
3691 current_function_nothrow
= nothrow_function_p ();
3692 if (current_function_nothrow
)
3693 /* Now we know that this can't throw; set the flag for the benefit
3694 of other functions later in this translation unit. */
3695 TREE_NOTHROW (current_function_decl
) = 1;
3697 /* Now turn the rtl into assembler code. */
3699 timevar_push (TV_FINAL
);
3704 /* Get the function's name, as described by its RTL. This may be
3705 different from the DECL_NAME name used in the source file. */
3707 x
= DECL_RTL (decl
);
3708 if (GET_CODE (x
) != MEM
)
3711 if (GET_CODE (x
) != SYMBOL_REF
)
3713 fnname
= XSTR (x
, 0);
3715 assemble_start_function (decl
, fnname
);
3716 final_start_function (insns
, asm_out_file
, optimize
);
3717 final (insns
, asm_out_file
, optimize
, 0);
3718 final_end_function (insns
, asm_out_file
, optimize
);
3719 assemble_end_function (decl
, fnname
);
3721 fflush (asm_out_file
);
3723 /* Release all memory allocated by flow. */
3724 free_basic_block_vars (0);
3726 /* Release all memory held by regsets now. */
3727 regset_release_memory ();
3729 timevar_pop (TV_FINAL
);
3733 /* Write DBX symbols if requested. */
3735 /* Note that for those inline functions where we don't initially
3736 know for certain that we will be generating an out-of-line copy,
3737 the first invocation of this routine (rest_of_compilation) will
3738 skip over this code by doing a `goto exit_rest_of_compilation;'.
3739 Later on, finish_compilation will call rest_of_compilation again
3740 for those inline functions that need to have out-of-line copies
3741 generated. During that call, we *will* be routed past here. */
3743 timevar_push (TV_SYMOUT
);
3744 #ifdef DBX_DEBUGGING_INFO
3745 if (write_symbols
== DBX_DEBUG
)
3746 dbxout_function (decl
);
3749 #ifdef DWARF_DEBUGGING_INFO
3750 if (write_symbols
== DWARF_DEBUG
)
3751 dwarfout_file_scope_decl (decl
, 0);
3754 #ifdef DWARF2_DEBUGGING_INFO
3755 if (write_symbols
== DWARF2_DEBUG
)
3756 dwarf2out_decl (decl
);
3758 timevar_pop (TV_SYMOUT
);
3760 exit_rest_of_compilation
:
3762 /* In case the function was not output,
3763 don't leave any temporary anonymous types
3764 queued up for sdb output. */
3765 #ifdef SDB_DEBUGGING_INFO
3766 if (write_symbols
== SDB_DEBUG
)
3767 sdbout_types (NULL_TREE
);
3770 reload_completed
= 0;
3771 flow2_completed
= 0;
3774 timevar_push (TV_FINAL
);
3776 /* Clear out the insn_length contents now that they are no
3778 init_insn_lengths ();
3780 /* Clear out the real_constant_chain before some of the rtx's
3781 it runs through become garbage. */
3782 clear_const_double_mem ();
3784 /* Show no temporary slots allocated. */
3787 free_basic_block_vars (0);
3789 timevar_pop (TV_FINAL
);
3791 /* Make sure volatile mem refs aren't considered valid operands for
3792 arithmetic insns. We must call this here if this is a nested inline
3793 function, since the above code leaves us in the init_recog state
3794 (from final.c), and the function context push/pop code does not
3795 save/restore volatile_ok.
3797 ??? Maybe it isn't necessary for expand_start_function to call this
3798 anymore if we do it here? */
3800 init_recog_no_volatile ();
3802 /* We're done with this function. Free up memory if we can. */
3803 free_after_parsing (cfun
);
3804 if (! DECL_DEFER_OUTPUT (decl
))
3805 free_after_compilation (cfun
);
3810 timevar_pop (TV_REST_OF_COMPILATION
);
3820 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3821 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3822 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3823 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3824 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3825 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"));
3827 for (i
= ARRAY_SIZE (f_options
); i
--;)
3829 const char *description
= f_options
[i
].description
;
3831 if (description
!= NULL
&& * description
!= 0)
3832 printf (" -f%-21s %s\n",
3833 f_options
[i
].string
, description
);
3836 printf (_(" -O[number] Set optimisation level to [number]\n"));
3837 printf (_(" -Os Optimise for space rather than speed\n"));
3838 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3839 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3840 printf (_(" -w Suppress warnings\n"));
3841 printf (_(" -W Enable extra warnings\n"));
3843 for (i
= ARRAY_SIZE (W_options
); i
--;)
3845 const char *description
= W_options
[i
].description
;
3847 if (description
!= NULL
&& * description
!= 0)
3848 printf (" -W%-21s %s\n",
3849 W_options
[i
].string
, description
);
3852 printf (_(" -Wunused Enable unused warnings\n"));
3853 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3854 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3855 printf (_(" -p Enable function profiling\n"));
3856 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3857 printf (_(" -a Enable block profiling \n"));
3859 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3860 printf (_(" -ax Enable jump profiling \n"));
3862 printf (_(" -o <file> Place output into <file> \n"));
3864 -G <number> Put global and static data smaller than <number>\n\
3865 bytes into a special section (on some targets)\n"));
3867 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3869 if (debug_args
[i
].description
!= NULL
)
3870 printf (" -g%-21s %s\n",
3871 debug_args
[i
].arg
, debug_args
[i
].description
);
3874 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3875 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3876 printf (_(" -version Display the compiler's version\n"));
3877 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3878 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3879 #if defined INSN_SCHEDULING
3880 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3882 printf (_(" --help Display this information\n"));
3887 /* Display descriptions of language specific options.
3888 If there is no description, note that there is an undocumented option.
3889 If the description is empty, do not display anything. (This allows
3890 options to be deliberately undocumented, for whatever reason).
3891 If the option string is missing, then this is a marker, indicating
3892 that the description string is in fact the name of a language, whose
3893 language specific options are to follow. */
3895 if (ARRAY_SIZE (documented_lang_options
) > 1)
3897 printf (_("\nLanguage specific options:\n"));
3899 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3901 const char *description
= documented_lang_options
[i
].description
;
3902 const char *option
= documented_lang_options
[i
].option
;
3904 if (description
== NULL
)
3909 printf (_(" %-23.23s [undocumented]\n"), option
);
3911 else if (*description
== 0)
3913 else if (option
== NULL
)
3917 (_("\nThere are undocumented %s specific options as well.\n"),
3921 printf (_("\n Options for %s:\n"), description
);
3926 printf (" %-23.23s %s\n", option
, description
);
3931 printf (_("\nThere are undocumented %s specific options as well.\n"),
3934 display_target_options ();
3938 display_target_options ()
3942 if (ARRAY_SIZE (target_switches
) > 1
3943 #ifdef TARGET_OPTIONS
3944 || ARRAY_SIZE (target_options
) > 1
3952 printf (_("\nTarget specific options:\n"));
3954 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3956 const char *option
= target_switches
[i
].name
;
3957 const char *description
= target_switches
[i
].description
;
3959 if (option
== NULL
|| *option
== 0)
3961 else if (description
== NULL
)
3966 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3968 else if (* description
!= 0)
3969 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3972 #ifdef TARGET_OPTIONS
3973 for (i
= ARRAY_SIZE (target_options
); i
--;)
3975 const char *option
= target_options
[i
].prefix
;
3976 const char *description
= target_options
[i
].description
;
3978 if (option
== NULL
|| *option
== 0)
3980 else if (description
== NULL
)
3985 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3987 else if (* description
!= 0)
3988 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3994 printf (_("\nThere are undocumented target specific options as well.\n"));
3996 printf (_(" They exist, but they are not documented.\n"));
4001 /* Parse a -d... comand line switch. */
4004 decode_d_option (arg
)
4013 for (i
= 0; i
< DFI_MAX
; ++i
)
4014 dump_file
[i
].enabled
= 1;
4023 flag_print_asm_name
= 1;
4026 flag_dump_rtl_in_asm
= 1;
4027 flag_print_asm_name
= 1;
4030 graph_dump_format
= vcg
;
4033 rtl_dump_and_exit
= 1;
4038 case 'D': /* These are handled by the preprocessor. */
4044 for (i
= 0; i
< DFI_MAX
; ++i
)
4045 if (c
== dump_file
[i
].debug_switch
)
4047 dump_file
[i
].enabled
= 1;
4052 warning ("unrecognized gcc debugging option: %c", c
);
4057 /* Parse a -f... comand line switch. ARG is the value after the -f.
4058 It is safe to access 'ARG - 2' to generate the full switch name.
4059 Return the number of strings consumed. */
4062 decode_f_option (arg
)
4066 const char *option_value
= NULL
;
4068 /* Search for the option in the table of binary f options. */
4069 for (j
= ARRAY_SIZE (f_options
); j
--;)
4071 if (!strcmp (arg
, f_options
[j
].string
))
4073 *f_options
[j
].variable
= f_options
[j
].on_value
;
4077 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4078 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4080 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4085 if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4086 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4089 read_integral_parameter (option_value
, arg
- 2,
4091 set_param_value ("max-inline-insns", val
);
4093 #ifdef INSN_SCHEDULING
4094 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4095 fix_sched_param ("verbose", option_value
);
4097 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4098 fix_register (option_value
, 1, 1);
4099 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4100 fix_register (option_value
, 0, 1);
4101 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4102 fix_register (option_value
, 0, 0);
4103 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4104 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4105 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4107 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4108 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4109 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4110 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4112 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4113 else if ((option_value
4114 = skip_leading_substring (arg
, "stack-limit-register=")))
4116 int reg
= decode_reg_name (option_value
);
4118 error ("unrecognized register name `%s'", option_value
);
4120 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4122 else if ((option_value
4123 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4126 nm
= ggc_strdup (option_value
);
4127 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4129 else if ((option_value
4130 = skip_leading_substring (arg
, "message-length=")))
4131 diagnostic_message_length_per_line
=
4132 read_integral_parameter (option_value
, arg
- 2,
4133 diagnostic_message_length_per_line
);
4134 else if ((option_value
4135 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4137 if (!strcmp (option_value
, "once"))
4138 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4139 else if (!strcmp (option_value
, "every-line"))
4140 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4142 error ("Unrecognized option `%s'", arg
- 2);
4144 else if (!strcmp (arg
, "no-stack-limit"))
4145 stack_limit_rtx
= NULL_RTX
;
4146 else if (!strcmp (arg
, "preprocessed"))
4147 /* Recognise this switch but do nothing. This prevents warnings
4148 about an unrecognized switch if cpplib has not been linked in. */
4156 /* Parse a -W... comand line switch. ARG is the value after the -W.
4157 It is safe to access 'ARG - 2' to generate the full switch name.
4158 Return the number of strings consumed. */
4161 decode_W_option (arg
)
4164 const char *option_value
= NULL
;
4167 /* Search for the option in the table of binary W options. */
4169 for (j
= ARRAY_SIZE (W_options
); j
--;)
4171 if (!strcmp (arg
, W_options
[j
].string
))
4173 *W_options
[j
].variable
= W_options
[j
].on_value
;
4177 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4178 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4180 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4185 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4187 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4189 if (id_clash_len
!= -1)
4192 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4194 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4196 warn_larger_than
= larger_than_size
!= -1;
4198 else if (!strcmp (arg
, "unused"))
4202 else if (!strcmp (arg
, "no-unused"))
4212 /* Parse a -g... comand line switch. ARG is the value after the -g.
4213 It is safe to access 'ARG - 2' to generate the full switch name.
4214 Return the number of strings consumed. */
4217 decode_g_option (arg
)
4221 /* A lot of code assumes write_symbols == NO_DEBUG if the
4222 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4223 of what debugging type has been selected). This records the
4224 selected type. It is an error to specify more than one
4226 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4227 /* Non-zero if debugging format has been explicitly set.
4228 -g and -ggdb don't explicitly set the debugging format so
4229 -gdwarf -g3 is equivalent to -gdwarf3. */
4230 static int type_explicitly_set_p
= 0;
4231 /* Indexed by enum debug_info_type. */
4232 static const char *debug_type_names
[] =
4234 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4237 /* The maximum admissible debug level value. */
4238 static const unsigned max_debug_level
= 3;
4240 /* Look up ARG in the table. */
4241 for (da
= debug_args
; da
->arg
; da
++)
4243 const int da_len
= strlen (da
->arg
);
4245 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4247 enum debug_info_type type
= da
->debug_type
;
4248 const char *p
= arg
+ da_len
;
4250 if (*p
&& (*p
< '0' || *p
> '9'))
4253 /* A debug flag without a level defaults to level 2.
4254 Note we do not want to call read_integral_parameter
4255 for that case since it will call atoi which
4258 ??? We may want to generalize the interface to
4259 read_integral_parameter to better handle this case
4260 if this case shows up often. */
4262 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4266 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4268 error ("use -gdwarf -g%d for DWARF v1, level %d",
4271 error ("use -gdwarf-2 for DWARF v2");
4274 if (level
> max_debug_level
)
4277 ignoring option `%s' due to invalid debug level specification",
4279 level
= debug_info_level
;
4282 if (type
== NO_DEBUG
)
4284 type
= PREFERRED_DEBUGGING_TYPE
;
4286 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4288 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4289 type
= DWARF2_DEBUG
;
4291 #ifdef DBX_DEBUGGING_INFO
4298 if (type
== NO_DEBUG
)
4299 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4301 /* Does it conflict with an already selected type? */
4302 if (type_explicitly_set_p
4303 /* -g/-ggdb don't conflict with anything. */
4304 && da
->debug_type
!= NO_DEBUG
4305 && type
!= selected_debug_type
)
4306 warning ("`%s' ignored, conflicts with `-g%s'",
4307 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4310 /* If the format has already been set, -g/-ggdb
4311 only change the debug level. */
4312 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4313 /* Don't change debugging type. */
4317 selected_debug_type
= type
;
4318 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4321 write_symbols
= (level
== 0
4323 : selected_debug_type
);
4324 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4325 debug_info_level
= (enum debug_info_level
) level
;
4338 /* Decode the first argument in the argv as a language-independent option.
4339 Return the number of strings consumed. */
4342 independent_decode_option (argc
, argv
)
4346 char *arg
= argv
[0];
4348 if (arg
[0] != '-' || arg
[1] == 0)
4360 if (!strcmp (arg
, "-help"))
4366 if (!strcmp (arg
, "-target-help"))
4368 display_target_options ();
4372 if (!strcmp (arg
, "-version"))
4374 print_version (stderr
, "");
4378 /* Handle '--param <name>=<value>'. */
4379 if (strcmp (arg
, "-param") == 0)
4385 error ("-param option missing argument");
4389 /* Get the '<name>=<value' parameter. */
4391 /* Look for the `='. */
4392 equal
= strchr (arg
, '=');
4394 error ("invalid --param option: %s", arg
);
4399 /* Zero out the `=' sign so that we get two separate strings. */
4401 /* Figure out what value is specified. */
4402 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4403 if (val
!= INVALID_PARAM_VAL
)
4404 set_param_value (arg
, val
);
4406 error ("invalid parameter value `%s'", equal
+ 1);
4421 /* Already been treated in main (). Do nothing. */
4425 set_target_switch (arg
+ 1);
4429 return decode_f_option (arg
+ 1);
4432 return decode_g_option (arg
+ 1);
4435 if (!strcmp (arg
, "dumpbase"))
4440 dump_base_name
= argv
[1];
4444 decode_d_option (arg
+ 1);
4448 if (!strcmp (arg
, "pedantic"))
4450 else if (!strcmp (arg
, "pedantic-errors"))
4451 flag_pedantic_errors
= pedantic
= 1;
4452 else if (arg
[1] == 0)
4459 if (!strcmp (arg
, "quiet"))
4466 if (!strcmp (arg
, "version"))
4474 inhibit_warnings
= 1;
4483 /* We save the value of warn_uninitialized, since if they put
4484 -Wuninitialized on the command line, we need to generate a
4485 warning about not using it without also specifying -O. */
4486 if (warn_uninitialized
!= 1)
4487 warn_uninitialized
= 2;
4490 return decode_W_option (arg
+ 1);
4496 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4497 warning ("`-a' option (basic block profile) not supported");
4499 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4502 else if (!strcmp (arg
, "ax"))
4504 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4505 warning ("`-ax' option (jump profiling) not supported");
4507 profile_block_flag
= (!profile_block_flag
4508 || profile_block_flag
== 2) ? 2 : 3;
4511 else if (!strncmp (arg
, "aux-info", 8))
4513 flag_gen_aux_info
= 1;
4519 aux_info_file_name
= argv
[1];
4523 aux_info_file_name
= arg
+ 8;
4535 asm_file_name
= argv
[1];
4550 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4555 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4559 if (g_switch_val
== -1)
4563 g_switch_set
= TRUE
;
4564 g_switch_value
= g_switch_val
;
4574 /* Entry point of cc1/c++. Decode command args, then call compile_file.
4575 Exit code is 35 if can't open files, 34 if fatal error,
4576 33 if had nonfatal errors, else success. */
4578 extern int main
PARAMS ((int, char **));
4588 /* save in case md file wants to emit args as a comment. */
4592 p
= argv
[0] + strlen (argv
[0]);
4593 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4597 xmalloc_set_program_name (progname
);
4599 /* LC_CTYPE determines the character set used by the terminal so it has be set
4600 to output messages correctly. */
4602 #ifdef HAVE_LC_MESSAGES
4603 setlocale (LC_CTYPE
, "");
4604 setlocale (LC_MESSAGES
, "");
4606 setlocale (LC_ALL
, "");
4609 (void) bindtextdomain (PACKAGE
, localedir
);
4610 (void) textdomain (PACKAGE
);
4612 /* Install handler for SIGFPE, which may be received while we do
4613 compile-time floating point arithmetic. */
4614 signal (SIGFPE
, float_signal
);
4616 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4618 signal (SIGSEGV
, crash_signal
);
4621 signal (SIGILL
, crash_signal
);
4624 signal (SIGBUS
, crash_signal
);
4627 signal (SIGABRT
, crash_signal
);
4629 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4630 signal (SIGIOT
, crash_signal
);
4633 decl_printable_name
= decl_name
;
4634 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4636 /* Initialize whether `char' is signed. */
4637 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4638 #ifdef DEFAULT_SHORT_ENUMS
4639 /* Initialize how much space enums occupy, by default. */
4640 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4643 /* Initialize the garbage-collector. */
4646 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4647 ggc_add_tree_root (¤t_function_decl
, 1);
4648 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4650 /* Initialize the diagnostics reporting machinery. */
4651 initialize_diagnostics ();
4653 /* Register the language-independent parameters. */
4654 add_params (lang_independent_params
, LAST_PARAM
);
4656 /* Perform language-specific options intialization. */
4657 if (lang_hooks
.init_options
)
4658 (*lang_hooks
.init_options
) ();
4660 /* Scan to see what optimization level has been specified. That will
4661 determine the default value of many flags. */
4662 for (i
= 1; i
< argc
; i
++)
4664 if (!strcmp (argv
[i
], "-O"))
4669 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4671 /* Handle -Os, -O2, -O3, -O69, ... */
4672 char *p
= &argv
[i
][2];
4674 if ((p
[0] == 's') && (p
[1] == 0))
4678 /* Optimizing for size forces optimize to be 2. */
4683 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4684 if (optimize_val
!= -1)
4686 optimize
= optimize_val
;
4696 flag_thread_jumps
= 1;
4698 flag_delayed_branch
= 1;
4700 #ifdef CAN_DEBUG_WITHOUT_FP
4701 flag_omit_frame_pointer
= 1;
4703 flag_guess_branch_prob
= 1;
4708 flag_optimize_sibling_calls
= 1;
4709 flag_cse_follow_jumps
= 1;
4710 flag_cse_skip_blocks
= 1;
4712 flag_expensive_optimizations
= 1;
4713 flag_strength_reduce
= 1;
4714 flag_rerun_cse_after_loop
= 1;
4715 flag_rerun_loop_opt
= 1;
4716 flag_caller_saves
= 1;
4719 #ifdef INSN_SCHEDULING
4720 flag_schedule_insns
= 1;
4721 flag_schedule_insns_after_reload
= 1;
4724 flag_strict_aliasing
= 1;
4725 flag_delete_null_pointer_checks
= 1;
4726 flag_reorder_blocks
= 1;
4731 flag_inline_functions
= 1;
4732 flag_rename_registers
= 1;
4735 if (optimize
< 2 || optimize_size
)
4740 align_functions
= 1;
4743 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4746 set_target_switch ("");
4748 /* Unwind tables are always present in an ABI-conformant IA-64
4749 object file, so the default should be ON. */
4750 #ifdef IA64_UNWIND_INFO
4751 flag_unwind_tables
= IA64_UNWIND_INFO
;
4754 #ifdef OPTIMIZATION_OPTIONS
4755 /* Allow default optimizations to be specified on a per-machine basis. */
4756 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4759 /* Initialize register usage now so switches may override. */
4762 /* Perform normal command line switch decoding. */
4763 for (i
= 1; i
< argc
;)
4765 unsigned int lang_processed
;
4766 unsigned int indep_processed
;
4768 /* Give the language a chance to decode the option for itself. */
4769 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4771 /* Now see if the option also has a language independent meaning.
4772 Some options are both language specific and language independent,
4774 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4776 if (lang_processed
|| indep_processed
)
4777 i
+= MAX (lang_processed
, indep_processed
);
4780 const char *option
= NULL
;
4781 const char *lang
= NULL
;
4784 /* It is possible that the command line switch is not valid for the
4785 current language, but it is valid for another language. In order
4786 to be compatible with previous versions of the compiler (which
4787 did not issue an error message in this case) we check for this
4788 possibility here. If we do find a match, then if extra_warnings
4789 is set we generate a warning message, otherwise we will just
4790 ignore the option. */
4791 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4793 option
= documented_lang_options
[j
].option
;
4796 lang
= documented_lang_options
[j
].description
;
4797 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4801 if (j
!= ARRAY_SIZE (documented_lang_options
))
4805 warning ("Ignoring command line option '%s'", argv
[i
]);
4808 ("(It is valid for %s but not the selected language)",
4812 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4813 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4815 error ("Unrecognized option `%s'", argv
[i
]);
4821 /* All command line options have been processed. */
4822 if (lang_hooks
.post_options
)
4823 (*lang_hooks
.post_options
) ();
4825 /* Reflect any language-specific diagnostic option setting. */
4826 reshape_diagnostic_buffer ();
4828 /* Checker uses the frame pointer. */
4829 if (flag_check_memory_usage
)
4830 flag_omit_frame_pointer
= 0;
4834 /* Inlining does not work if not optimizing,
4835 so force it not to be done. */
4839 /* The c_decode_option function and decode_option hook set
4840 this to `2' if -Wall is used, so we can avoid giving out
4841 lots of errors for people who don't realize what -Wall does. */
4842 if (warn_uninitialized
== 1)
4843 warning ("-Wuninitialized is not supported without -O");
4846 #ifdef OVERRIDE_OPTIONS
4847 /* Some machines may reject certain combinations of options. */
4851 if (exceptions_via_longjmp
== 2)
4853 #ifdef DWARF2_UNWIND_INFO
4854 exceptions_via_longjmp
= ! DWARF2_UNWIND_INFO
;
4856 #ifdef IA64_UNWIND_INFO
4857 exceptions_via_longjmp
= ! IA64_UNWIND_INFO
;
4859 exceptions_via_longjmp
= 1;
4864 /* Since each function gets its own handler data, we can't support the
4865 new model currently, since it depend on a specific rethrow label
4866 which is declared at the front of the table, and we can only
4867 have one such symbol in a file. */
4868 #ifdef IA64_UNWIND_INFO
4869 flag_new_exceptions
= 0;
4872 /* Set up the align_*_log variables, defaulting them to 1 if they
4873 were still unset. */
4874 if (align_loops
<= 0) align_loops
= 1;
4875 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4876 if (align_jumps
<= 0) align_jumps
= 1;
4877 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4878 if (align_labels
<= 0) align_labels
= 1;
4879 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4880 if (align_functions
<= 0) align_functions
= 1;
4881 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4883 if (profile_block_flag
== 3)
4885 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4886 profile_block_flag
= 2;
4889 /* Unrolling all loops implies that standard loop unrolling must also
4891 if (flag_unroll_all_loops
)
4892 flag_unroll_loops
= 1;
4893 /* Loop unrolling requires that strength_reduction be on also. Silently
4894 turn on strength reduction here if it isn't already on. Also, the loop
4895 unrolling code assumes that cse will be run after loop, so that must
4896 be turned on also. */
4897 if (flag_unroll_loops
)
4899 flag_strength_reduce
= 1;
4900 flag_rerun_cse_after_loop
= 1;
4903 /* Warn about options that are not supported on this machine. */
4904 #ifndef INSN_SCHEDULING
4905 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4906 warning ("instruction scheduling not supported on this target machine");
4909 if (flag_delayed_branch
)
4910 warning ("this target machine does not have delayed branches");
4913 user_label_prefix
= USER_LABEL_PREFIX
;
4914 if (flag_leading_underscore
!= -1)
4916 /* If the default prefix is more complicated than "" or "_",
4917 issue a warning and ignore this option. */
4918 if (user_label_prefix
[0] == 0 ||
4919 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4921 user_label_prefix
= flag_leading_underscore
? "_" : "";
4924 warning ("-f%sleading-underscore not supported on this target machine",
4925 flag_leading_underscore
? "" : "no-");
4928 /* If we are in verbose mode, write out the version and maybe all the
4929 option flags in use. */
4932 print_version (stderr
, "");
4934 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4937 compile_file (filename
);
4939 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4942 char *lim
= (char *) sbrk (0);
4944 fnotice (stderr
, "Data size %ld.\n", (long) (lim
- (char *) &environ
));
4949 system ("ps -l 1>&2");
4952 #endif /* not USG */
4955 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4958 return (FATAL_EXIT_CODE
);
4960 return (FATAL_EXIT_CODE
);
4961 return (SUCCESS_EXIT_CODE
);
4964 /* Decode -m switches. */
4965 /* Decode the switch -mNAME. */
4968 set_target_switch (name
)
4972 int valid_target_option
= 0;
4974 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4975 if (!strcmp (target_switches
[j
].name
, name
))
4977 if (target_switches
[j
].value
< 0)
4978 target_flags
&= ~-target_switches
[j
].value
;
4980 target_flags
|= target_switches
[j
].value
;
4981 valid_target_option
= 1;
4984 #ifdef TARGET_OPTIONS
4985 if (!valid_target_option
)
4986 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4988 int len
= strlen (target_options
[j
].prefix
);
4989 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4991 *target_options
[j
].variable
= name
+ len
;
4992 valid_target_option
= 1;
4997 if (!valid_target_option
)
4998 error ("Invalid option `%s'", name
);
5001 /* Print version information to FILE.
5002 Each line begins with INDENT (for the case where FILE is the
5003 assembler output file). */
5006 print_version (file
, indent
)
5011 #define __VERSION__ "[?]"
5015 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5017 "%s%s%s version %s (%s) compiled by CC.\n"
5019 , indent
, *indent
!= 0 ? " " : "",
5020 language_string
, version_string
, TARGET_NAME
,
5021 indent
, __VERSION__
);
5024 /* Print an option value and return the adjusted position in the line.
5025 ??? We don't handle error returns from fprintf (disk full); presumably
5026 other code will catch a disk full though. */
5029 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5032 const char *indent
, *sep
, *term
, *type
, *name
;
5034 /* The ultrix fprintf returns 0 on success, so compute the result we want
5035 here since we need it for the following test. */
5036 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5041 fprintf (file
, "%s", term
);
5046 fprintf (file
, "%s", indent
);
5047 pos
= strlen (indent
);
5049 fprintf (file
, "%s%s%s", sep
, type
, name
);
5054 /* Print active target switches to FILE.
5055 POS is the current cursor position and MAX is the size of a "line".
5056 Each line begins with INDENT and ends with TERM.
5057 Each switch is separated from the next by SEP. */
5060 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5063 const char *indent
, *sep
, *term
;
5068 /* Print the options as passed. */
5070 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5071 _("options passed: "), "");
5073 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5077 if (strcmp (*p
, "-o") == 0)
5083 if (strcmp (*p
, "-quiet") == 0)
5085 if (strcmp (*p
, "-version") == 0)
5090 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5093 fprintf (file
, "%s", term
);
5095 /* Print the -f and -m options that have been enabled.
5096 We don't handle language specific options but printing argv
5099 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5100 _("options enabled: "), "");
5102 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5103 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5104 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5105 "-f", f_options
[j
].string
);
5107 /* Print target specific options. */
5109 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5110 if (target_switches
[j
].name
[0] != '\0'
5111 && target_switches
[j
].value
> 0
5112 && ((target_switches
[j
].value
& target_flags
)
5113 == target_switches
[j
].value
))
5115 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5116 "-m", target_switches
[j
].name
);
5119 #ifdef TARGET_OPTIONS
5120 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5121 if (*target_options
[j
].variable
!= NULL
)
5124 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5125 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5126 prefix
, *target_options
[j
].variable
);
5130 fprintf (file
, "%s", term
);
5133 /* Record the beginning of a new source file, named FILENAME. */
5136 debug_start_source_file (filename
)
5137 register const char *filename ATTRIBUTE_UNUSED
;
5139 #ifdef DBX_DEBUGGING_INFO
5140 if (write_symbols
== DBX_DEBUG
)
5141 dbxout_start_new_source_file (filename
);
5143 #ifdef DWARF_DEBUGGING_INFO
5144 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5145 && write_symbols
== DWARF_DEBUG
)
5146 dwarfout_start_new_source_file (filename
);
5147 #endif /* DWARF_DEBUGGING_INFO */
5148 #ifdef DWARF2_DEBUGGING_INFO
5149 if (write_symbols
== DWARF2_DEBUG
)
5150 dwarf2out_start_source_file (filename
);
5151 #endif /* DWARF2_DEBUGGING_INFO */
5152 #ifdef SDB_DEBUGGING_INFO
5153 if (write_symbols
== SDB_DEBUG
)
5154 sdbout_start_new_source_file (filename
);
5158 /* Record the resumption of a source file. LINENO is the line number in
5159 the source file we are returning to. */
5162 debug_end_source_file (lineno
)
5163 register unsigned lineno ATTRIBUTE_UNUSED
;
5165 #ifdef DBX_DEBUGGING_INFO
5166 if (write_symbols
== DBX_DEBUG
)
5167 dbxout_resume_previous_source_file ();
5169 #ifdef DWARF_DEBUGGING_INFO
5170 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5171 && write_symbols
== DWARF_DEBUG
)
5172 dwarfout_resume_previous_source_file (lineno
);
5173 #endif /* DWARF_DEBUGGING_INFO */
5174 #ifdef DWARF2_DEBUGGING_INFO
5175 if (write_symbols
== DWARF2_DEBUG
)
5176 dwarf2out_end_source_file ();
5177 #endif /* DWARF2_DEBUGGING_INFO */
5178 #ifdef SDB_DEBUGGING_INFO
5179 if (write_symbols
== SDB_DEBUG
)
5180 sdbout_resume_previous_source_file ();
5184 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5185 the tail part of the directive line, i.e. the part which is past the
5186 initial whitespace, #, whitespace, directive-name, whitespace part. */
5189 debug_define (lineno
, buffer
)
5190 register unsigned lineno ATTRIBUTE_UNUSED
;
5191 register const char *buffer ATTRIBUTE_UNUSED
;
5193 #ifdef DWARF_DEBUGGING_INFO
5194 if (write_symbols
== DWARF_DEBUG
)
5195 dwarfout_define (lineno
, buffer
);
5196 #endif /* DWARF_DEBUGGING_INFO */
5197 #ifdef DWARF2_DEBUGGING_INFO
5198 if (write_symbols
== DWARF2_DEBUG
)
5199 dwarf2out_define (lineno
, buffer
);
5200 #endif /* DWARF2_DEBUGGING_INFO */
5203 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5204 the tail part of the directive line, i.e. the part which is past the
5205 initial whitespace, #, whitespace, directive-name, whitespace part. */
5208 debug_undef (lineno
, buffer
)
5209 register unsigned lineno ATTRIBUTE_UNUSED
;
5210 register const char *buffer ATTRIBUTE_UNUSED
;
5212 #ifdef DWARF_DEBUGGING_INFO
5213 if (write_symbols
== DWARF_DEBUG
)
5214 dwarfout_undef (lineno
, buffer
);
5215 #endif /* DWARF_DEBUGGING_INFO */
5216 #ifdef DWARF2_DEBUGGING_INFO
5217 if (write_symbols
== DWARF2_DEBUG
)
5218 dwarf2out_undef (lineno
, buffer
);
5219 #endif /* DWARF2_DEBUGGING_INFO */
5222 /* Returns nonzero if it is appropriate not to emit any debugging
5223 information for BLOCK, because it doesn't contain any instructions.
5224 This may not be the case for blocks containing nested functions, since
5225 we may actually call such a function even though the BLOCK information
5229 debug_ignore_block (block
)
5230 tree block ATTRIBUTE_UNUSED
;
5232 /* Never delete the BLOCK for the outermost scope
5233 of the function; we can refer to names from
5234 that scope even if the block notes are messed up. */
5235 if (is_body_block (block
))
5238 #ifdef DWARF2_DEBUGGING_INFO
5239 if (write_symbols
== DWARF2_DEBUG
)
5240 return dwarf2out_ignore_block (block
);