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 /* Nonzero if we should exit after parsing options. */
395 static int exit_after_options
= 0;
397 /* The FUNCTION_DECL for the function currently being compiled,
398 or 0 if between functions. */
399 tree current_function_decl
;
401 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
403 tree current_function_func_begin_label
;
405 /* Pointer to function to compute the name to use to print a declaration.
406 DECL is the declaration in question.
407 VERBOSITY determines what information will be printed:
408 0: DECL_NAME, demangled as necessary.
409 1: and scope information.
410 2: and any other information that might be interesting, such as function
411 parameter types in C++. */
413 const char *(*decl_printable_name
) PARAMS ((tree
, int));
415 /* Pointer to function to compute rtl for a language-specific tree code. */
417 typedef rtx (*lang_expand_expr_t
)
418 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
419 enum expand_modifier modifier
));
421 lang_expand_expr_t lang_expand_expr
= 0;
423 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
425 /* Pointer to function to finish handling an incomplete decl at the
426 end of compilation. */
428 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
430 /* Nonzero if doing dwarf2 duplicate elimination. */
432 int flag_eliminate_dwarf2_dups
= 0;
434 /* Nonzero if generating code to do profiling. */
436 int profile_flag
= 0;
438 /* Nonzero if generating code to do profiling on a line-by-line basis. */
440 int profile_block_flag
;
442 /* Nonzero if generating code to profile program flow graph arcs. */
444 int profile_arc_flag
= 0;
446 /* Nonzero if generating info for gcov to calculate line test coverage. */
448 int flag_test_coverage
= 0;
450 /* Nonzero indicates that branch taken probabilities should be calculated. */
452 int flag_branch_probabilities
= 0;
454 /* Nonzero if basic blocks should be reordered. */
456 int flag_reorder_blocks
= 0;
458 /* Nonzero if registers should be renamed. */
460 int flag_rename_registers
= 0;
462 /* Nonzero for -pedantic switch: warn about anything
463 that standard spec forbids. */
467 /* Temporarily suppress certain warnings.
468 This is set while reading code from a system header file. */
470 int in_system_header
= 0;
472 /* Don't print functions as they are compiled. -quiet. */
476 /* Print times taken by the various passes. -ftime-report. */
480 /* Print memory still in use at end of compilation (which may have little
481 to do with peak memory consumption). -fmem-report. */
485 /* Non-zero means to collect statistics which might be expensive
486 and to print them when we are done. */
487 int flag_detailed_statistics
= 0;
492 /* Nonzero means `char' should be signed. */
494 int flag_signed_char
;
496 /* Nonzero means give an enum type only as many bytes as it needs. */
498 int flag_short_enums
;
500 /* Nonzero for -fcaller-saves: allocate values in regs that need to
501 be saved across function calls, if that produces overall better code.
502 Optional now, so people can test it. */
504 #ifdef DEFAULT_CALLER_SAVES
505 int flag_caller_saves
= 1;
507 int flag_caller_saves
= 0;
510 /* Nonzero if structures and unions should be returned in memory.
512 This should only be defined if compatibility with another compiler or
513 with an ABI is needed, because it results in slower code. */
515 #ifndef DEFAULT_PCC_STRUCT_RETURN
516 #define DEFAULT_PCC_STRUCT_RETURN 1
519 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
521 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
523 /* Nonzero for -fforce-mem: load memory value into a register
524 before arithmetic on it. This makes better cse but slower compilation. */
526 int flag_force_mem
= 0;
528 /* Nonzero for -fforce-addr: load memory address into a register before
529 reference to memory. This makes better cse but slower compilation. */
531 int flag_force_addr
= 0;
533 /* Nonzero for -fdefer-pop: don't pop args after each function call;
534 instead save them up to pop many calls' args with one insns. */
536 int flag_defer_pop
= 0;
538 /* Nonzero for -ffloat-store: don't allocate floats and doubles
539 in extended-precision registers. */
541 int flag_float_store
= 0;
543 /* Nonzero for -fcse-follow-jumps:
544 have cse follow jumps to do a more extensive job. */
546 int flag_cse_follow_jumps
;
548 /* Nonzero for -fcse-skip-blocks:
549 have cse follow a branch around a block. */
550 int flag_cse_skip_blocks
;
552 /* Nonzero for -fexpensive-optimizations:
553 perform miscellaneous relatively-expensive optimizations. */
554 int flag_expensive_optimizations
;
556 /* Nonzero for -fthread-jumps:
557 have jump optimize output of loop. */
559 int flag_thread_jumps
;
561 /* Nonzero enables strength-reduction in loop.c. */
563 int flag_strength_reduce
= 0;
565 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
566 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
567 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
570 int flag_unroll_loops
;
572 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
573 This is generally not a win. */
575 int flag_unroll_all_loops
;
577 /* Nonzero forces all invariant computations in loops to be moved
580 int flag_move_all_movables
= 0;
582 /* Nonzero forces all general induction variables in loops to be
585 int flag_reduce_all_givs
= 0;
587 /* Nonzero to perform full register move optimization passes. This is the
590 int flag_regmove
= 0;
592 /* Nonzero for -fwritable-strings:
593 store string constants in data segment and don't uniquize them. */
595 int flag_writable_strings
= 0;
597 /* Nonzero means don't put addresses of constant functions in registers.
598 Used for compiling the Unix kernel, where strange substitutions are
599 done on the assembly output. */
601 int flag_no_function_cse
= 0;
603 /* Nonzero for -fomit-frame-pointer:
604 don't make a frame pointer in simple functions that don't require one. */
606 int flag_omit_frame_pointer
= 0;
608 /* Nonzero means place each function into its own section on those platforms
609 which support arbitrary section names and unlimited numbers of sections. */
611 int flag_function_sections
= 0;
613 /* ... and similar for data. */
615 int flag_data_sections
= 0;
617 /* Nonzero to inhibit use of define_optimization peephole opts. */
619 int flag_no_peephole
= 0;
621 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
622 operations in the interest of optimization. For example it allows
623 GCC to assume arguments to sqrt are nonnegative numbers, allowing
624 faster code for sqrt to be generated. */
626 int flag_fast_math
= 0;
628 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
630 int flag_optimize_sibling_calls
= 0;
632 /* Nonzero means the front end generally wants `errno' maintained by math
633 operations, like built-in SQRT, unless overridden by flag_fast_math. */
635 int flag_errno_math
= 1;
637 /* 0 means straightforward implementation of complex divide acceptable.
638 1 means wide ranges of inputs must work for complex divide.
639 2 means C99-like requirements for complex divide (not yet implemented). */
641 int flag_complex_divide_method
= 0;
643 /* Nonzero means all references through pointers are volatile. */
647 /* Nonzero means treat all global and extern variables as volatile. */
649 int flag_volatile_global
;
651 /* Nonzero means treat all static variables as volatile. */
653 int flag_volatile_static
;
655 /* Nonzero means just do syntax checking; don't output anything. */
657 int flag_syntax_only
= 0;
659 /* Nonzero means perform global cse. */
661 static int flag_gcse
;
663 /* Nonzero means to use global dataflow analysis to eliminate
664 useless null pointer tests. */
666 static int flag_delete_null_pointer_checks
;
668 /* Nonzero means to rerun cse after loop optimization. This increases
669 compilation time about 20% and picks up a few more common expressions. */
671 static int flag_rerun_cse_after_loop
;
673 /* Nonzero means to run loop optimizations twice. */
675 int flag_rerun_loop_opt
;
677 /* Nonzero for -finline-functions: ok to inline functions that look like
678 good inline candidates. */
680 int flag_inline_functions
;
682 /* Nonzero for -fkeep-inline-functions: even if we make a function
683 go inline everywhere, keep its definition around for debugging
686 int flag_keep_inline_functions
;
688 /* Nonzero means that functions will not be inlined. */
692 /* Nonzero means that we should emit static const variables
693 regardless of whether or not optimization is turned on. */
695 int flag_keep_static_consts
= 1;
697 /* Nonzero means we should be saving declaration info into a .X file. */
699 int flag_gen_aux_info
= 0;
701 /* Specified name of aux-info file. */
703 static char *aux_info_file_name
;
705 /* Nonzero means make the text shared if supported. */
707 int flag_shared_data
;
709 /* Nonzero means schedule into delayed branch slots if supported. */
711 int flag_delayed_branch
;
713 /* Nonzero if we are compiling pure (sharable) code.
714 Value is 1 if we are doing reasonable (i.e. simple
715 offset into offset table) pic. Value is 2 if we can
716 only perform register offsets. */
720 /* Nonzero means generate extra code for exception handling and enable
721 exception handling. */
725 /* Nonzero means use the new model for exception handling. Replaces
726 -DNEW_EH_MODEL as a compile option. */
728 int flag_new_exceptions
= 1;
730 /* Nonzero means generate frame unwind info table when supported. */
732 int flag_unwind_tables
= 0;
734 /* Nonzero means don't place uninitialized global data in common storage
739 /* Nonzero means pretend it is OK to examine bits of target floats,
740 even if that isn't true. The resulting code will have incorrect constants,
741 but the same series of instructions that the native compiler would make. */
743 int flag_pretend_float
;
745 /* Nonzero means change certain warnings into errors.
746 Usually these are warnings about failure to conform to some standard. */
748 int flag_pedantic_errors
= 0;
750 /* flag_schedule_insns means schedule insns within basic blocks (before
752 flag_schedule_insns_after_reload means schedule insns after
755 int flag_schedule_insns
= 0;
756 int flag_schedule_insns_after_reload
= 0;
758 /* The following flags have effect only for scheduling before register
761 flag_schedule_interblock means schedule insns accross basic blocks.
762 flag_schedule_speculative means allow speculative motion of non-load insns.
763 flag_schedule_speculative_load means allow speculative motion of some
765 flag_schedule_speculative_load_dangerous allows speculative motion of more
768 int flag_schedule_interblock
= 1;
769 int flag_schedule_speculative
= 1;
770 int flag_schedule_speculative_load
= 0;
771 int flag_schedule_speculative_load_dangerous
= 0;
773 int flag_single_precision_constant
;
775 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
776 by a cheaper branch on a count register. */
777 int flag_branch_on_count_reg
= 1;
779 /* -finhibit-size-directive inhibits output of .size for ELF.
780 This is used only for compiling crtstuff.c,
781 and it may be extended to other effects
782 needed for crtstuff.c on other systems. */
783 int flag_inhibit_size_directive
= 0;
785 /* -fverbose-asm causes extra commentary information to be produced in
786 the generated assembly code (to make it more readable). This option
787 is generally only of use to those who actually need to read the
788 generated assembly code (perhaps while debugging the compiler itself).
789 -fno-verbose-asm, the default, causes the extra information
790 to be omitted and is useful when comparing two assembler files. */
792 int flag_verbose_asm
= 0;
794 /* -dA causes debug commentary information to be produced in
795 the generated assembly code (to make it more readable). This option
796 is generally only of use to those who actually need to read the
797 generated assembly code (perhaps while debugging the compiler itself).
798 Currently, this switch is only used by dwarfout.c; however, it is intended
799 to be a catchall for printing debug information in the assembler file. */
801 int flag_debug_asm
= 0;
803 /* -dP causes the rtl to be emitted as a comment in assembly. */
805 int flag_dump_rtl_in_asm
= 0;
807 /* -fgnu-linker specifies use of the GNU linker for initializations.
808 (Or, more generally, a linker that handles initializations.)
809 -fno-gnu-linker says that collect2 will be used. */
811 int flag_gnu_linker
= 0;
813 int flag_gnu_linker
= 1;
819 /* Enable dead code elimination. */
822 /* Tag all structures with __attribute__(packed). */
823 int flag_pack_struct
= 0;
825 /* Emit code to check for stack overflow; also may cause large objects
826 to be allocated dynamically. */
827 int flag_stack_check
;
829 /* When non-NULL, indicates that whenever space is allocated on the
830 stack, the resulting stack pointer must not pass this
831 address---that is, for stacks that grow downward, the stack pointer
832 must always be greater than or equal to this address; for stacks
833 that grow upward, the stack pointer must be less than this address.
834 At present, the rtx may be either a REG or a SYMBOL_REF, although
835 the support provided depends on the backend. */
838 /* -fcheck-memory-usage causes extra code to be generated in order to check
839 memory accesses. This is used by a detector of bad memory accesses such
841 int flag_check_memory_usage
= 0;
843 /* -fprefix-function-name causes function name to be prefixed. This
844 can be used with -fcheck-memory-usage to isolate code compiled with
845 -fcheck-memory-usage. */
846 int flag_prefix_function_name
= 0;
848 /* 0 if pointer arguments may alias each other. True in C.
849 1 if pointer arguments may not alias each other but may alias
851 2 if pointer arguments may not alias each other and may not
852 alias global variables. True in Fortran.
853 This defaults to 0 for C. */
854 int flag_argument_noalias
= 0;
856 /* Nonzero if we should do (language-dependent) alias analysis.
857 Typically, this analysis will assume that expressions of certain
858 types do not alias expressions of certain other types. Only used
859 if alias analysis (in general) is enabled. */
860 int flag_strict_aliasing
= 0;
862 /* Instrument functions with calls at entry and exit, for profiling. */
863 int flag_instrument_function_entry_exit
= 0;
865 /* Nonzero means ignore `#ident' directives. 0 means handle them.
866 On SVR4 targets, it also controls whether or not to emit a
867 string identifying the compiler. */
869 int flag_no_ident
= 0;
871 /* This will perform a peephole pass before sched2. */
872 int flag_peephole2
= 0;
874 /* This will try to guess branch probabilities. */
875 int flag_guess_branch_prob
= 0;
877 /* -fbounded-pointers causes gcc to compile pointers as composite
878 objects occupying three words: the pointer value, the base address
879 of the referent object, and the address immediately beyond the end
880 of the referent object. The base and extent allow us to perform
881 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
882 int flag_bounded_pointers
= 0;
884 /* -fcheck-bounds causes gcc to generate array bounds checks.
885 For C, C++: defaults to value of flag_bounded_pointers.
886 For ObjC: defaults to off.
887 For Java: defaults to on.
888 For Fortran: defaults to off.
889 For CHILL: defaults to off. */
890 int flag_bounds_check
= 0;
892 /* If one, renumber instruction UIDs to reduce the number of
893 unused UIDs if there are a lot of instructions. If greater than
894 one, unconditionally renumber instruction UIDs. */
895 int flag_renumber_insns
= 1;
897 /* Values of the -falign-* flags: how much to align labels in code.
898 0 means `use default', 1 means `don't align'.
899 For each variable, there is an _log variant which is the power
900 of two not less than the variable, for .align output. */
907 int align_labels_log
;
909 int align_functions_log
;
911 /* Table of supported debugging formats. */
915 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
916 constant expression, we use NO_DEBUG in its place. */
917 enum debug_info_type debug_type
;
918 int use_extensions_p
;
919 const char *description
;
923 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
924 "Generate default debug format output" },
925 { "gdb", NO_DEBUG
, 1, "Generate default extended debug format output" },
926 #ifdef DBX_DEBUGGING_INFO
927 { "stabs", DBX_DEBUG
, 0, "Generate STABS format debug output" },
928 { "stabs+", DBX_DEBUG
, 1, "Generate extended STABS format debug output" },
930 #ifdef DWARF_DEBUGGING_INFO
931 { "dwarf", DWARF_DEBUG
, 0, "Generate DWARF-1 format debug output"},
932 { "dwarf+", DWARF_DEBUG
, 1,
933 "Generated extended DWARF-1 format debug output" },
935 #ifdef DWARF2_DEBUGGING_INFO
936 { "dwarf-2", DWARF2_DEBUG
, 0, "Enable DWARF-2 debug output" },
938 #ifdef XCOFF_DEBUGGING_INFO
939 { "xcoff", XCOFF_DEBUG
, 0, "Generate XCOFF format debug output" },
940 { "xcoff+", XCOFF_DEBUG
, 1, "Generate extended XCOFF format debug output" },
942 #ifdef SDB_DEBUGGING_INFO
943 { "coff", SDB_DEBUG
, 0, "Generate COFF format debug output" },
953 const char *description
;
955 lang_independent_options
;
959 /* Add or remove a leading underscore from user symbols. */
960 int flag_leading_underscore
= -1;
962 /* The user symbol prefix after having resolved same. */
963 const char *user_label_prefix
;
965 static const param_info lang_independent_params
[] = {
966 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
968 #include "params.def"
973 /* A default for same. */
974 #ifndef USER_LABEL_PREFIX
975 #define USER_LABEL_PREFIX ""
978 /* Table of language-independent -f options.
979 STRING is the option name. VARIABLE is the address of the variable.
980 ON_VALUE is the value to store in VARIABLE
981 if `-fSTRING' is seen as an option.
982 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
984 lang_independent_options f_options
[] =
986 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
987 "Perform DWARF2 duplicate elimination"},
988 {"float-store", &flag_float_store
, 1,
989 "Do not store floats in registers" },
990 {"volatile", &flag_volatile
, 1,
991 "Consider all mem refs through pointers as volatile"},
992 {"volatile-global", &flag_volatile_global
, 1,
993 "Consider all mem refs to global data to be volatile" },
994 {"volatile-static", &flag_volatile_static
, 1,
995 "Consider all mem refs to static data to be volatile" },
996 {"defer-pop", &flag_defer_pop
, 1,
997 "Defer popping functions args from stack until later" },
998 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
999 "When possible do not generate stack frames"},
1000 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1001 "Optimize sibling and tail recursive calls" },
1002 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1003 "When running CSE, follow jumps to their targets" },
1004 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1005 "When running CSE, follow conditional jumps" },
1006 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1007 "Perform a number of minor, expensive optimisations" },
1008 {"thread-jumps", &flag_thread_jumps
, 1,
1009 "Perform jump threading optimisations"},
1010 {"strength-reduce", &flag_strength_reduce
, 1,
1011 "Perform strength reduction optimisations" },
1012 {"unroll-loops", &flag_unroll_loops
, 1,
1013 "Perform loop unrolling when iteration count is known" },
1014 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1015 "Perform loop unrolling for all loops" },
1016 {"move-all-movables", &flag_move_all_movables
, 1,
1017 "Force all loop invariant computations out of loops" },
1018 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1019 "Strength reduce all loop general induction variables" },
1020 {"writable-strings", &flag_writable_strings
, 1,
1021 "Store strings in writable data section" },
1022 {"peephole", &flag_no_peephole
, 0,
1023 "Enable machine specific peephole optimisations" },
1024 {"force-mem", &flag_force_mem
, 1,
1025 "Copy memory operands into registers before using" },
1026 {"force-addr", &flag_force_addr
, 1,
1027 "Copy memory address constants into regs before using" },
1028 {"function-cse", &flag_no_function_cse
, 0,
1029 "Allow function addresses to be held in registers" },
1030 {"inline-functions", &flag_inline_functions
, 1,
1031 "Integrate simple functions into their callers" },
1032 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1033 "Generate code for funcs even if they are fully inlined" },
1034 {"inline", &flag_no_inline
, 0,
1035 "Pay attention to the 'inline' keyword"},
1036 {"keep-static-consts", &flag_keep_static_consts
, 1,
1037 "Emit static const variables even if they are not used" },
1038 {"syntax-only", &flag_syntax_only
, 1,
1039 "Check for syntax errors, then stop" },
1040 {"shared-data", &flag_shared_data
, 1,
1041 "Mark data as shared rather than private" },
1042 {"caller-saves", &flag_caller_saves
, 1,
1043 "Enable saving registers around function calls" },
1044 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1045 "Return 'short' aggregates in memory, not registers" },
1046 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1047 "Return 'short' aggregates in registers" },
1048 {"delayed-branch", &flag_delayed_branch
, 1,
1049 "Attempt to fill delay slots of branch instructions" },
1050 {"gcse", &flag_gcse
, 1,
1051 "Perform the global common subexpression elimination" },
1052 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1053 "Run CSE pass after loop optimisations"},
1054 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1055 "Run the loop optimiser twice"},
1056 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1057 "Delete useless null pointer checks" },
1058 {"pretend-float", &flag_pretend_float
, 1,
1059 "Pretend that host and target use the same FP format"},
1060 {"schedule-insns", &flag_schedule_insns
, 1,
1061 "Reschedule instructions before register allocation"},
1062 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1063 "Reschedule instructions after register allocation"},
1064 {"sched-interblock",&flag_schedule_interblock
, 1,
1065 "Enable scheduling across basic blocks" },
1066 {"sched-spec",&flag_schedule_speculative
, 1,
1067 "Allow speculative motion of non-loads" },
1068 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1069 "Allow speculative motion of some loads" },
1070 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1071 "Allow speculative motion of more loads" },
1072 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1073 "Replace add,compare,branch with branch on count reg"},
1074 {"pic", &flag_pic
, 1,
1075 "Generate position independent code, if possible"},
1076 {"PIC", &flag_pic
, 2, ""},
1077 {"exceptions", &flag_exceptions
, 1,
1078 "Enable exception handling" },
1079 {"new-exceptions", &flag_new_exceptions
, 1,
1080 "Use the new model for exception handling" },
1081 {"unwind-tables", &flag_unwind_tables
, 1,
1082 "Just generate unwind tables for exception handling" },
1083 {"sjlj-exceptions", &exceptions_via_longjmp
, 1,
1084 "Use setjmp/longjmp to handle exceptions" },
1085 {"asynchronous-exceptions", &asynchronous_exceptions
, 1,
1086 "Support asynchronous exceptions" },
1087 {"profile-arcs", &profile_arc_flag
, 1,
1088 "Insert arc based program profiling code" },
1089 {"test-coverage", &flag_test_coverage
, 1,
1090 "Create data files needed by gcov" },
1091 {"branch-probabilities", &flag_branch_probabilities
, 1,
1092 "Use profiling information for branch probabilities" },
1093 {"reorder-blocks", &flag_reorder_blocks
, 1,
1094 "Reorder basic blocks to improve code placement" },
1095 {"rename-registers", &flag_rename_registers
, 1,
1096 "Do the register renaming optimization pass"},
1097 {"fast-math", &flag_fast_math
, 1,
1098 "Improve FP speed by violating ANSI & IEEE rules" },
1099 {"common", &flag_no_common
, 0,
1100 "Do not put unitialised globals in the common section" },
1101 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1102 "Do not generate .size directives" },
1103 {"function-sections", &flag_function_sections
, 1,
1104 "place each function into its own section" },
1105 {"data-sections", &flag_data_sections
, 1,
1106 "place data items into their own section" },
1107 {"verbose-asm", &flag_verbose_asm
, 1,
1108 "Add extra commentry to assembler output"},
1109 {"gnu-linker", &flag_gnu_linker
, 1,
1110 "Output GNU ld formatted global initialisers"},
1111 {"regmove", &flag_regmove
, 1,
1112 "Enables a register move optimisation"},
1113 {"optimize-register-move", &flag_regmove
, 1,
1114 "Do the full regmove optimization pass"},
1115 {"pack-struct", &flag_pack_struct
, 1,
1116 "Pack structure members together without holes" },
1117 {"stack-check", &flag_stack_check
, 1,
1118 "Insert stack checking code into the program" },
1119 {"argument-alias", &flag_argument_noalias
, 0,
1120 "Specify that arguments may alias each other & globals"},
1121 {"argument-noalias", &flag_argument_noalias
, 1,
1122 "Assume arguments may alias globals but not each other"},
1123 {"argument-noalias-global", &flag_argument_noalias
, 2,
1124 "Assume arguments do not alias each other or globals" },
1125 {"strict-aliasing", &flag_strict_aliasing
, 1,
1126 "Assume strict aliasing rules apply" },
1127 {"align-loops", &align_loops
, 0,
1128 "Align the start of loops" },
1129 {"align-jumps", &align_jumps
, 0,
1130 "Align labels which are only reached by jumping" },
1131 {"align-labels", &align_labels
, 0,
1132 "Align all labels" },
1133 {"align-functions", &align_functions
, 0,
1134 "Align the start of functions" },
1135 {"check-memory-usage", &flag_check_memory_usage
, 1,
1136 "Generate code to check every memory access" },
1137 {"prefix-function-name", &flag_prefix_function_name
, 1,
1138 "Add a prefix to all function names" },
1139 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1140 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1141 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1142 "Instrument function entry/exit with profiling calls"},
1143 {"ssa", &flag_ssa
, 1,
1144 "Enable SSA optimizations" },
1145 {"dce", &flag_dce
, 1,
1146 "Enable dead code elimination" },
1147 {"leading-underscore", &flag_leading_underscore
, 1,
1148 "External symbols have a leading underscore" },
1149 {"ident", &flag_no_ident
, 0,
1150 "Process #ident directives"},
1151 { "peephole2", &flag_peephole2
, 1,
1152 "Enables an rtl peephole pass run before sched2" },
1153 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1154 "Enables guessing of branch probabilities" },
1155 {"math-errno", &flag_errno_math
, 1,
1156 "Set errno after built-in math functions"},
1157 {"bounded-pointers", &flag_bounded_pointers
, 1,
1158 "Compile pointers as triples: value, base & end" },
1159 {"bounds-check", &flag_bounds_check
, 1,
1160 "Generate code to check bounds before dereferencing pointers and arrays" },
1161 {"single-precision-constant", &flag_single_precision_constant
, 1,
1162 "Convert floating point constant to single precision constant"},
1163 {"time-report", &time_report
, 1,
1164 "Report time taken by each compiler pass at end of run"},
1165 {"mem-report", &mem_report
, 1,
1166 "Report on permanent memory allocation at end of run"},
1167 { "trapv", &flag_trapv
, 1,
1168 "Trap for signed overflow in addition / subtraction / multiplication." },
1171 /* Table of language-specific options. */
1173 static struct lang_opt
1176 const char *description
;
1178 documented_lang_options
[] =
1180 /* In order not to overload the --help output, the convention
1181 used here is to only describe those options which are not
1182 enabled by default. */
1184 { "-ansi", "Compile just for ISO C89" },
1185 { "-fallow-single-precision",
1186 "Do not promote floats to double if using -traditional" },
1187 { "-std= ", "Determine language standard"},
1189 { "-fsigned-bitfields", "" },
1190 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1191 { "-fno-signed-bitfields", "" },
1192 { "-fno-unsigned-bitfields","" },
1193 { "-fsigned-char", "Make 'char' be signed by default"},
1194 { "-funsigned-char", "Make 'char' be unsigned by default"},
1195 { "-fno-signed-char", "" },
1196 { "-fno-unsigned-char", "" },
1198 { "-ftraditional", "" },
1199 { "-traditional", "Attempt to support traditional K&R style C"},
1200 { "-fnotraditional", "" },
1201 { "-fno-traditional", "" },
1204 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1205 { "-fbuiltin", "" },
1206 { "-fno-builtin", "Do not recognise any built in functions" },
1207 { "-fhosted", "Assume normal C execution environment" },
1208 { "-fno-hosted", "" },
1210 "Assume that standard libraries & main might not exist" },
1211 { "-fno-freestanding", "" },
1212 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1213 { "-fno-cond-mismatch", "" },
1214 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1215 { "-fno-dollars-in-identifiers", "" },
1216 { "-fpreprocessed", "" },
1217 { "-fno-preprocessed", "" },
1218 { "-fshort-double", "Use the same size for double as for float" },
1219 { "-fno-short-double", "" },
1220 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1221 { "-fno-short-enums", "" },
1222 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1223 { "-fno-short-wchar", "" },
1225 { "-Wall", "Enable most warning messages" },
1226 { "-Wbad-function-cast",
1227 "Warn about casting functions to incompatible types" },
1228 { "-Wno-bad-function-cast", "" },
1229 { "-Wno-missing-noreturn", "" },
1230 { "-Wmissing-format-attribute",
1231 "Warn about functions which might be candidates for format attributes" },
1232 { "-Wno-missing-format-attribute", "" },
1233 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1234 { "-Wno-cast-qual", "" },
1235 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1236 { "-Wno-char-subscripts", "" },
1237 { "-Wcomment", "Warn if nested comments are detected" },
1238 { "-Wno-comment", "" },
1239 { "-Wcomments", "Warn if nested comments are detected" },
1240 { "-Wno-comments", "" },
1241 { "-Wconversion", "Warn about possibly confusing type conversions" },
1242 { "-Wno-conversion", "" },
1243 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1244 { "-Wno-format", "" },
1245 { "-Wformat-y2k", "" },
1246 { "-Wno-format-y2k",
1247 "Don't warn about strftime formats yielding 2 digit years" },
1248 { "-Wformat-extra-args", "" },
1249 { "-Wno-format-extra-args",
1250 "Don't warn about too many arguments to format functions" },
1251 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1252 { "-Wno-format-nonliteral", "" },
1253 { "-Wformat-security",
1254 "Warn about possible security problems with format functions" },
1255 { "-Wno-format-security", "" },
1256 { "-Wimplicit-function-declaration",
1257 "Warn about implicit function declarations" },
1258 { "-Wno-implicit-function-declaration", "" },
1259 { "-Werror-implicit-function-declaration", "" },
1260 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1261 { "-Wno-implicit-int", "" },
1262 { "-Wimplicit", "" },
1263 { "-Wno-implicit", "" },
1264 { "-Wimport", "Warn about the use of the #import directive" },
1265 { "-Wno-import", "" },
1266 { "-Wlong-long","" },
1267 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1268 { "-Wmain", "Warn about suspicious declarations of main" },
1269 { "-Wno-main", "" },
1270 { "-Wmissing-braces",
1271 "Warn about possibly missing braces around initialisers" },
1272 { "-Wno-missing-braces", "" },
1273 { "-Wmissing-declarations",
1274 "Warn about global funcs without previous declarations"},
1275 { "-Wno-missing-declarations", "" },
1276 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1277 { "-Wno-missing-prototypes", "" },
1278 { "-Wmultichar", "Warn about use of multicharacter literals"},
1279 { "-Wno-multichar", "" },
1280 { "-Wnested-externs", "Warn about externs not at file scope level" },
1281 { "-Wno-nested-externs", "" },
1282 { "-Wparentheses", "Warn about possible missing parentheses" },
1283 { "-Wno-parentheses", "" },
1284 { "-Wsequence-point",
1285 "Warn about possible violations of sequence point rules" },
1286 { "-Wno-sequence-point", "" },
1287 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1288 { "-Wno-pointer-arith", "" },
1289 { "-Wredundant-decls",
1290 "Warn about multiple declarations of the same object" },
1291 { "-Wno-redundant-decls", "" },
1292 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1293 { "-Wno-sign-compare", "" },
1294 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1295 { "-Wno-float-equal", "" },
1296 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1297 { "-Wno-unknown-pragmas", "" },
1298 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1299 { "-Wno-strict-prototypes", "" },
1300 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1301 { "-Wno-traditional", "" },
1302 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1303 { "-Wno-trigraphs", "" },
1305 { "-Wno-undef", "" },
1306 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1307 { "-Wno-write-strings", "" },
1309 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1311 #include "options.h"
1315 /* Here is a table, controlled by the tm.h file, listing each -m switch
1316 and which bits in `target_switches' it should set or clear.
1317 If VALUE is positive, it is bits to set.
1318 If VALUE is negative, -VALUE is bits to clear.
1319 (The sign bit is not used so there is no confusion.) */
1325 const char *description
;
1327 target_switches
[] = TARGET_SWITCHES
;
1329 /* This table is similar, but allows the switch to have a value. */
1331 #ifdef TARGET_OPTIONS
1335 const char **variable
;
1336 const char *description
;
1338 target_options
[] = TARGET_OPTIONS
;
1341 /* Options controlling warnings. */
1343 /* Don't print warning messages. -w. */
1345 int inhibit_warnings
= 0;
1347 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1349 int warn_system_headers
= 0;
1351 /* Print various extra warnings. -W. */
1353 int extra_warnings
= 0;
1355 /* Treat warnings as errors. -Werror. */
1357 int warnings_are_errors
= 0;
1359 /* Nonzero to warn about unused variables, functions et.al. */
1361 int warn_unused_function
;
1362 int warn_unused_label
;
1363 int warn_unused_parameter
;
1364 int warn_unused_variable
;
1365 int warn_unused_value
;
1368 set_Wunused (setting
)
1371 warn_unused_function
= setting
;
1372 warn_unused_label
= setting
;
1373 /* Unused function parameter warnings are reported when either ``-W
1374 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1375 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1377 warn_unused_parameter
= 0;
1378 else if (!warn_unused_parameter
)
1379 warn_unused_parameter
= -1;
1380 warn_unused_variable
= setting
;
1381 warn_unused_value
= setting
;
1384 /* Nonzero to warn about code which is never reached. */
1386 int warn_notreached
;
1388 /* Nonzero to warn about variables used before they are initialized. */
1390 int warn_uninitialized
;
1392 /* Nonzero means warn about all declarations which shadow others. */
1396 /* Warn if a switch on an enum fails to have a case for every enum value. */
1400 /* Nonzero means warn about function definitions that default the return type
1401 or that use a null return and have a return-type other than void. */
1403 int warn_return_type
;
1405 /* Nonzero means warn about pointer casts that increase the required
1406 alignment of the target type (and might therefore lead to a crash
1407 due to a misaligned access). */
1409 int warn_cast_align
;
1411 /* Nonzero means warn about any identifiers that match in the first N
1412 characters. The value N is in `id_clash_len'. */
1417 /* Nonzero means warn about any objects definitions whose size is larger
1418 than N bytes. Also want about function definitions whose returned
1419 values are larger than N bytes. The value N is in `larger_than_size'. */
1421 int warn_larger_than
;
1422 HOST_WIDE_INT larger_than_size
;
1424 /* Nonzero means warn if inline function is too large. */
1428 /* Warn if a function returns an aggregate,
1429 since there are often incompatible calling conventions for doing this. */
1431 int warn_aggregate_return
;
1433 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1437 /* Warn when gcc pads a structure to an alignment boundary. */
1441 /* Warn when an optimization pass is disabled. */
1443 int warn_disabled_optimization
;
1445 /* Warn about functions which might be candidates for attribute noreturn. */
1447 int warn_missing_noreturn
;
1449 /* Likewise for -W. */
1451 lang_independent_options W_options
[] =
1453 {"unused-function", &warn_unused_function
, 1, "Warn when a function is unused" },
1454 {"unused-label", &warn_unused_label
, 1, "Warn when a label is unused" },
1455 {"unused-parameter", &warn_unused_parameter
, 1, "Warn when a function parameter is unused" },
1456 {"unused-variable", &warn_unused_variable
, 1, "Warn when a variable is unused" },
1457 {"unused-value", &warn_unused_value
, 1, "Warn when an expression value is unused" },
1458 {"system-headers", &warn_system_headers
, 1, "Do not suppress warnings from system headers"},
1459 {"error", &warnings_are_errors
, 1, ""},
1460 {"shadow", &warn_shadow
, 1, "Warn when one local variable shadows another" },
1461 {"switch", &warn_switch
, 1,
1462 "Warn about enumerated switches missing a specific case" },
1463 {"aggregate-return", &warn_aggregate_return
, 1,
1464 "Warn about returning structures, unions or arrays" },
1465 {"cast-align", &warn_cast_align
, 1,
1466 "Warn about pointer casts which increase alignment" },
1467 {"unreachable-code", &warn_notreached
, 1,
1468 "Warn about code that will never be executed" },
1469 {"uninitialized", &warn_uninitialized
, 1,
1470 "Warn about unitialized automatic variables"},
1471 {"inline", &warn_inline
, 1,
1472 "Warn when an inlined function cannot be inlined"},
1473 {"packed", &warn_packed
, 1,
1474 "Warn when the packed attribute has no effect on struct layout"},
1475 {"padded", &warn_padded
, 1,
1476 "Warn when padding is required to align struct members"},
1477 {"disabled-optimization", &warn_disabled_optimization
, 1,
1478 "Warn when an optimization pass is disabled"},
1479 {"missing-noreturn", &warn_missing_noreturn
, 1,
1480 "Warn about functions which might be candidates for attribute noreturn"}
1483 /* Output files for assembler code (real compiler output)
1484 and debugging dumps. */
1487 FILE *aux_info_file
;
1488 FILE *rtl_dump_file
= NULL
;
1490 /* Decode the string P as an integral parameter.
1491 If the string is indeed an integer return its numeric value else
1492 issue an Invalid Option error for the option PNAME and return DEFVAL.
1493 If PNAME is zero just return DEFVAL, do not call error. */
1496 read_integral_parameter (p
, pname
, defval
)
1501 const char *endp
= p
;
1505 if (*endp
>= '0' && *endp
<= '9')
1514 error ("Invalid option `%s'", pname
);
1522 /* This is the default decl_printable_name function. */
1525 decl_name (decl
, verbosity
)
1527 int verbosity ATTRIBUTE_UNUSED
;
1529 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1533 /* This calls abort and is used to avoid problems when abort if a macro.
1534 It is used when we need to pass the address of abort. */
1542 /* When `malloc.c' is compiled with `rcheck' defined,
1543 it calls this function to report clobberage. */
1547 const char *s ATTRIBUTE_UNUSED
;
1552 /* Return the logarithm of X, base 2, considering X unsigned,
1553 if X is a power of 2. Otherwise, returns -1.
1555 This should be used via the `exact_log2' macro. */
1559 register unsigned HOST_WIDE_INT x
;
1561 register int log
= 0;
1562 /* Test for 0 or a power of 2. */
1563 if (x
== 0 || x
!= (x
& -x
))
1565 while ((x
>>= 1) != 0)
1570 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1571 If X is 0, return -1.
1573 This should be used via the floor_log2 macro. */
1577 register unsigned HOST_WIDE_INT x
;
1579 register int log
= -1;
1586 /* Return the approximate positive square root of a number N. This is for
1587 statistical reports, not code generation. */
1602 d
= (s
* s
- x
) / (2 * s
);
1609 static int float_handler_set
;
1611 jmp_buf float_handler
;
1613 /* Signals actually come here. */
1616 float_signal (signo
)
1617 /* If this is missing, some compilers complain. */
1618 int signo ATTRIBUTE_UNUSED
;
1620 if (float_handled
== 0)
1621 crash_signal (signo
);
1622 #if defined (USG) || defined (hpux)
1623 /* Re-enable the signal catcher. */
1624 signal (SIGFPE
, float_signal
);
1627 signal (SIGFPE
, float_signal
);
1628 longjmp (float_handler
, 1);
1631 /* Specify where to longjmp to when a floating arithmetic error happens.
1632 If HANDLER is 0, it means don't handle the errors any more. */
1635 set_float_handler (handler
)
1638 float_handled
= (handler
!= 0);
1640 bcopy ((char *) handler
, (char *) float_handler
, sizeof (float_handler
));
1642 if (float_handled
&& ! float_handler_set
)
1644 signal (SIGFPE
, float_signal
);
1645 float_handler_set
= 1;
1649 /* This is a wrapper function for code which might elicit an
1650 arithmetic exception. That code should be passed in as a function
1651 pointer FN, and one argument DATA. DATA is usually a struct which
1652 contains the real input and output for function FN. This function
1653 returns 0 (failure) if longjmp was called (i.e. an exception
1654 occured.) It returns 1 (success) otherwise. */
1657 do_float_handler (fn
, data
)
1658 void (*fn
) PARAMS ((PTR
));
1665 /* We got here via longjmp () caused by an exception in function
1667 set_float_handler (NULL
);
1671 set_float_handler (buf
);
1673 set_float_handler (NULL
);
1677 /* Specify, in HANDLER, where to longjmp to when a floating arithmetic
1678 error happens, pushing the previous specification into OLD_HANDLER.
1679 Return an indication of whether there was a previous handler in effect. */
1682 push_float_handler (handler
, old_handler
)
1683 jmp_buf handler
, old_handler
;
1685 int was_handled
= float_handled
;
1689 memcpy ((char *) old_handler
, (char *) float_handler
,
1690 sizeof (float_handler
));
1692 memcpy ((char *) float_handler
, (char *) handler
, sizeof (float_handler
));
1696 /* Restore the previous specification of whether and where to longjmp to
1697 when a floating arithmetic error happens. */
1700 pop_float_handler (handled
, handler
)
1704 float_handled
= handled
;
1706 bcopy ((char *) handler
, (char *) float_handler
, sizeof (float_handler
));
1709 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1710 into ICE messages, which is much more user friendly. */
1713 crash_signal (signo
)
1716 internal_error ("Internal error: %s", strsignal (signo
));
1719 /* Strip off a legitimate source ending from the input string NAME of
1720 length LEN. Rather than having to know the names used by all of
1721 our front ends, we strip off an ending of a period followed by
1722 up to five characters. (Java uses ".class".) */
1725 strip_off_ending (name
, len
)
1730 for (i
= 2; i
< 6 && len
> i
; i
++)
1732 if (name
[len
- i
] == '.')
1734 name
[len
- i
] = '\0';
1740 /* Given a file name X, return the nondirectory portion. */
1743 file_name_nondirectory (x
)
1746 char *tmp
= (char *) strrchr (x
, '/');
1747 if (DIR_SEPARATOR
!= '/' && ! tmp
)
1748 tmp
= (char *) strrchr (x
, DIR_SEPARATOR
);
1750 return (char *) (tmp
+ 1);
1755 /* Output a quoted string. */
1758 output_quoted_string (asm_file
, string
)
1762 #ifdef OUTPUT_QUOTED_STRING
1763 OUTPUT_QUOTED_STRING (asm_file
, string
);
1767 putc ('\"', asm_file
);
1768 while ((c
= *string
++) != 0)
1770 if (c
== '\"' || c
== '\\')
1771 putc ('\\', asm_file
);
1774 putc ('\"', asm_file
);
1778 /* Output a file name in the form wanted by System V. */
1781 output_file_directive (asm_file
, input_name
)
1783 const char *input_name
;
1785 int len
= strlen (input_name
);
1786 const char *na
= input_name
+ len
;
1788 /* NA gets INPUT_NAME sans directory names. */
1789 while (na
> input_name
)
1791 if (IS_DIR_SEPARATOR (na
[-1]))
1796 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1797 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1799 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1800 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1802 fprintf (asm_file
, "\t.file\t");
1803 output_quoted_string (asm_file
, na
);
1804 fputc ('\n', asm_file
);
1809 #ifdef ASM_IDENTIFY_LANGUAGE
1810 /* Routine to build language identifier for object file. */
1813 output_lang_identify (asm_out_file
)
1816 int len
= strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1817 char *s
= (char *) alloca (len
);
1819 sprintf (s
, "__gnu_compiled_%s", lang_identify ());
1820 ASM_OUTPUT_LABEL (asm_out_file
, s
);
1824 /* Routine to open a dump file. Return true if the dump file is enabled. */
1827 open_dump_file (index
, decl
)
1828 enum dump_file_index index
;
1832 const char *open_arg
;
1835 if (! dump_file
[index
].enabled
)
1838 timevar_push (TV_DUMP
);
1839 if (rtl_dump_file
!= NULL
)
1840 fclose (rtl_dump_file
);
1842 sprintf (seq
, ".%02d.", index
);
1844 if (! dump_file
[index
].initialized
)
1846 /* If we've not initialized the files, do so now. */
1847 if (graph_dump_format
!= no_graph
1848 && dump_file
[index
].graph_dump_p
)
1850 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1851 clean_graph_dump_file (dump_base_name
, dump_name
);
1854 dump_file
[index
].initialized
= 1;
1860 dump_name
= concat (dump_base_name
, seq
,
1861 dump_file
[index
].extension
, NULL
);
1863 rtl_dump_file
= fopen (dump_name
, open_arg
);
1864 if (rtl_dump_file
== NULL
)
1865 fatal_io_error ("can't open %s", dump_name
);
1870 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1871 decl_printable_name (decl
, 2));
1873 timevar_pop (TV_DUMP
);
1877 /* Routine to close a dump file. */
1880 close_dump_file (index
, func
, insns
)
1881 enum dump_file_index index
;
1882 void (*func
) PARAMS ((FILE *, rtx
));
1885 if (! rtl_dump_file
)
1888 timevar_push (TV_DUMP
);
1890 && graph_dump_format
!= no_graph
1891 && dump_file
[index
].graph_dump_p
)
1896 sprintf (seq
, ".%02d.", index
);
1897 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1898 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1903 func (rtl_dump_file
, insns
);
1905 fflush (rtl_dump_file
);
1906 fclose (rtl_dump_file
);
1908 rtl_dump_file
= NULL
;
1909 timevar_pop (TV_DUMP
);
1912 /* Do any final processing required for the declarations in VEC, of
1913 which there are LEN. We write out inline functions and variables
1914 that have been deferred until this point, but which are required.
1915 Returns non-zero if anything was put out. */
1918 wrapup_global_declarations (vec
, len
)
1925 int output_something
= 0;
1927 for (i
= 0; i
< len
; i
++)
1931 /* We're not deferring this any longer. */
1932 DECL_DEFER_OUTPUT (decl
) = 0;
1934 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1935 && incomplete_decl_finalize_hook
!= 0)
1936 (*incomplete_decl_finalize_hook
) (decl
);
1939 /* Now emit any global variables or functions that we have been
1940 putting off. We need to loop in case one of the things emitted
1941 here references another one which comes earlier in the list. */
1945 for (i
= 0; i
< len
; i
++)
1949 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1952 /* Don't write out static consts, unless we still need them.
1954 We also keep static consts if not optimizing (for debugging),
1955 unless the user specified -fno-keep-static-consts.
1956 ??? They might be better written into the debug information.
1957 This is possible when using DWARF.
1959 A language processor that wants static constants to be always
1960 written out (even if it is not used) is responsible for
1961 calling rest_of_decl_compilation itself. E.g. the C front-end
1962 calls rest_of_decl_compilation from finish_decl.
1963 One motivation for this is that is conventional in some
1964 environments to write things like:
1965 static const char rcsid[] = "... version string ...";
1966 intending to force the string to be in the executable.
1968 A language processor that would prefer to have unneeded
1969 static constants "optimized away" would just defer writing
1970 them out until here. E.g. C++ does this, because static
1971 constants are often defined in header files.
1973 ??? A tempting alternative (for both C and C++) would be
1974 to force a constant to be written if and only if it is
1975 defined in a main file, as opposed to an include file. */
1977 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1978 && (! TREE_READONLY (decl
)
1979 || TREE_PUBLIC (decl
)
1981 && flag_keep_static_consts
1982 && !DECL_ARTIFICIAL (decl
))
1983 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1986 rest_of_decl_compilation (decl
, NULL_PTR
, 1, 1);
1989 if (TREE_CODE (decl
) == FUNCTION_DECL
1990 && DECL_INITIAL (decl
) != 0
1991 && DECL_SAVED_INSNS (decl
) != 0
1992 && (flag_keep_inline_functions
1993 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1994 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1997 output_inline_function (decl
);
2002 output_something
= 1;
2006 return output_something
;
2009 /* Issue appropriate warnings for the global declarations in VEC (of
2010 which there are LEN). Output debugging information for them. */
2013 check_global_declarations (vec
, len
)
2020 for (i
= 0; i
< len
; i
++)
2024 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2025 && ! TREE_ASM_WRITTEN (decl
))
2026 /* Cancel the RTL for this decl so that, if debugging info
2027 output for global variables is still to come,
2028 this one will be omitted. */
2029 SET_DECL_RTL (decl
, NULL_RTX
);
2031 /* Warn about any function
2032 declared static but not defined.
2033 We don't warn about variables,
2034 because many programs have static variables
2035 that exist only to get some text into the object file. */
2036 if (TREE_CODE (decl
) == FUNCTION_DECL
2037 && (warn_unused_function
2038 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2039 && DECL_INITIAL (decl
) == 0
2040 && DECL_EXTERNAL (decl
)
2041 && ! DECL_ARTIFICIAL (decl
)
2042 && ! TREE_PUBLIC (decl
))
2044 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2045 pedwarn_with_decl (decl
,
2046 "`%s' used but never defined");
2048 warning_with_decl (decl
,
2049 "`%s' declared `static' but never defined");
2050 /* This symbol is effectively an "extern" declaration now. */
2051 TREE_PUBLIC (decl
) = 1;
2052 assemble_external (decl
);
2055 /* Warn about static fns or vars defined but not used,
2056 but not about inline functions or static consts
2057 since defining those in header files is normal practice. */
2058 if (((warn_unused_function
2059 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2060 || (warn_unused_variable
2061 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2062 && ! DECL_IN_SYSTEM_HEADER (decl
)
2063 && ! DECL_EXTERNAL (decl
)
2064 && ! TREE_PUBLIC (decl
)
2065 && ! TREE_USED (decl
)
2066 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2067 /* The TREE_USED bit for file-scope decls
2068 is kept in the identifier, to handle multiple
2069 external decls in different scopes. */
2070 && ! TREE_USED (DECL_NAME (decl
)))
2071 warning_with_decl (decl
, "`%s' defined but not used");
2073 timevar_push (TV_SYMOUT
);
2074 #ifdef SDB_DEBUGGING_INFO
2075 /* The COFF linker can move initialized global vars to the end.
2076 And that can screw up the symbol ordering.
2077 By putting the symbols in that order to begin with,
2078 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2079 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2080 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2081 && ! DECL_EXTERNAL (decl
)
2082 && DECL_RTL (decl
) != 0)
2083 sdbout_symbol (decl
, 0);
2085 /* Output COFF information for non-global
2086 file-scope initialized variables. */
2087 if (write_symbols
== SDB_DEBUG
2088 && TREE_CODE (decl
) == VAR_DECL
2089 && DECL_INITIAL (decl
)
2090 && ! DECL_EXTERNAL (decl
)
2091 && DECL_RTL (decl
) != 0
2092 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2093 sdbout_toplevel_data (decl
);
2094 #endif /* SDB_DEBUGGING_INFO */
2095 #ifdef DWARF_DEBUGGING_INFO
2096 /* Output DWARF information for file-scope tentative data object
2097 declarations, file-scope (extern) function declarations (which
2098 had no corresponding body) and file-scope tagged type declarations
2099 and definitions which have not yet been forced out. */
2101 if (write_symbols
== DWARF_DEBUG
2102 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2103 dwarfout_file_scope_decl (decl
, 1);
2105 #ifdef DWARF2_DEBUGGING_INFO
2106 /* Output DWARF2 information for file-scope tentative data object
2107 declarations, file-scope (extern) function declarations (which
2108 had no corresponding body) and file-scope tagged type declarations
2109 and definitions which have not yet been forced out. */
2111 if (write_symbols
== DWARF2_DEBUG
2112 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2113 dwarf2out_decl (decl
);
2115 timevar_pop (TV_SYMOUT
);
2119 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2120 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2121 INPUT_FILENAME and LINENO accordingly. */
2124 push_srcloc (file
, line
)
2128 struct file_stack
*fs
;
2130 if (input_file_stack
)
2132 input_file_stack
->name
= input_filename
;
2133 input_file_stack
->line
= lineno
;
2136 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2137 fs
->name
= input_filename
= file
;
2138 fs
->line
= lineno
= line
;
2139 fs
->indent_level
= 0;
2140 fs
->next
= input_file_stack
;
2141 input_file_stack
= fs
;
2142 input_file_stack_tick
++;
2145 /* Pop the top entry off the stack of presently open source files.
2146 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2152 struct file_stack
*fs
;
2154 fs
= input_file_stack
;
2155 input_file_stack
= fs
->next
;
2157 input_file_stack_tick
++;
2158 /* The initial source file is never popped. */
2159 if (!input_file_stack
)
2161 input_filename
= input_file_stack
->name
;
2162 lineno
= input_file_stack
->line
;
2165 /* Compile an entire file of output from cpp, named NAME.
2166 Write a file of assembly output and various debugging dumps. */
2174 int name_specified
= name
!= 0;
2176 if (dump_base_name
== 0)
2177 dump_base_name
= name
? name
: "gccdump";
2182 /* Start timing total execution time. */
2185 timevar_start (TV_TOTAL
);
2187 /* Initialize data in various passes. */
2190 name
= init_parse (name
);
2191 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2192 || debug_info_level
== DINFO_LEVEL_VERBOSE
2193 || flag_test_coverage
2194 || warn_notreached
);
2197 init_decl_processing ();
2203 init_function_once ();
2204 init_stor_layout_once ();
2205 init_varasm_once ();
2207 /* The following initialization functions need to generate rtl, so
2208 provide a dummy function context for them. */
2209 init_dummy_function_start ();
2212 if (flag_caller_saves
)
2213 init_caller_save ();
2214 expand_dummy_function_end ();
2216 /* If auxiliary info generation is desired, open the output file.
2217 This goes in the same directory as the source file--unlike
2218 all the other output files. */
2219 if (flag_gen_aux_info
)
2221 aux_info_file
= fopen (aux_info_file_name
, "w");
2222 if (aux_info_file
== 0)
2223 fatal_io_error ("can't open %s", aux_info_file_name
);
2226 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2227 because then the driver will have provided the name of a temporary
2228 file or bit bucket for us. */
2230 if (! name_specified
&& asm_file_name
== 0)
2231 asm_out_file
= stdout
;
2234 if (asm_file_name
== 0)
2236 int len
= strlen (dump_base_name
);
2237 char *dumpname
= (char *) xmalloc (len
+ 6);
2238 memcpy (dumpname
, dump_base_name
, len
+ 1);
2239 strip_off_ending (dumpname
, len
);
2240 strcat (dumpname
, ".s");
2241 asm_file_name
= dumpname
;
2243 if (!strcmp (asm_file_name
, "-"))
2244 asm_out_file
= stdout
;
2246 asm_out_file
= fopen (asm_file_name
, "w");
2247 if (asm_out_file
== 0)
2248 fatal_io_error ("can't open %s for writing", asm_file_name
);
2251 #ifdef IO_BUFFER_SIZE
2252 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2253 _IOFBF
, IO_BUFFER_SIZE
);
2257 name
= ggc_strdup (name
);
2259 input_filename
= name
;
2261 /* Put an entry on the input file stack for the main input file. */
2262 push_srcloc (input_filename
, 0);
2264 /* Perform language-specific initialization.
2265 This may set main_input_filename. */
2266 if (lang_hooks
.init
)
2267 (*lang_hooks
.init
) ();
2269 /* If the input doesn't start with a #line, use the input name
2270 as the official input file name. */
2271 if (main_input_filename
== 0)
2272 main_input_filename
= name
;
2274 if (flag_syntax_only
)
2276 write_symbols
= NO_DEBUG
;
2278 profile_block_flag
= 0;
2282 ASM_FILE_START (asm_out_file
);
2284 #ifdef ASM_COMMENT_START
2285 if (flag_verbose_asm
)
2287 /* Print the list of options in effect. */
2288 print_version (asm_out_file
, ASM_COMMENT_START
);
2289 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2290 ASM_COMMENT_START
, " ", "\n");
2291 /* Add a blank line here so it appears in assembler output but not
2293 fprintf (asm_out_file
, "\n");
2297 /* Output something to inform GDB that this compilation was by GCC. */
2298 #ifndef ASM_IDENTIFY_GCC
2299 fprintf (asm_out_file
, "gcc2_compiled.:\n");
2301 ASM_IDENTIFY_GCC (asm_out_file
);
2304 /* Output something to identify which front-end produced this file. */
2305 #ifdef ASM_IDENTIFY_LANGUAGE
2306 ASM_IDENTIFY_LANGUAGE (asm_out_file
);
2308 } /* ! flag_syntax_only */
2310 #ifndef ASM_OUTPUT_SECTION_NAME
2311 if (flag_function_sections
)
2313 warning ("-ffunction-sections not supported for this target.");
2314 flag_function_sections
= 0;
2316 if (flag_data_sections
)
2318 warning ("-fdata-sections not supported for this target.");
2319 flag_data_sections
= 0;
2323 if (flag_function_sections
2324 && (profile_flag
|| profile_block_flag
))
2326 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2327 flag_function_sections
= 0;
2330 #ifndef OBJECT_FORMAT_ELF
2331 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2332 warning ("-ffunction-sections may affect debugging on some targets.");
2335 /* ??? Note: There used to be a conditional here
2336 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2337 This was to guarantee separation between gcc_compiled. and
2338 the first function, for the sake of dbx on Suns.
2339 However, having the extra zero here confused the Emacs
2340 code for unexec, and might confuse other programs too.
2341 Therefore, I took out that change.
2342 In future versions we should find another way to solve
2343 that dbx problem. -- rms, 23 May 93. */
2345 /* Don't let the first function fall at the same address
2346 as gcc_compiled., if profiling. */
2347 if (profile_flag
|| profile_block_flag
)
2349 /* It's best if we can write a nop here since some
2350 assemblers don't tolerate zeros in the text section. */
2351 output_asm_insn (get_insn_template (CODE_FOR_nop
, NULL
), NULL_PTR
);
2354 /* If dbx symbol table desired, initialize writing it
2355 and output the predefined types. */
2356 timevar_push (TV_SYMOUT
);
2357 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2358 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2359 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2361 #ifdef SDB_DEBUGGING_INFO
2362 if (write_symbols
== SDB_DEBUG
)
2363 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2365 #ifdef DWARF_DEBUGGING_INFO
2366 if (write_symbols
== DWARF_DEBUG
)
2367 dwarfout_init (asm_out_file
, main_input_filename
);
2369 #ifdef DWARF2_UNWIND_INFO
2370 if (dwarf2out_do_frame ())
2371 dwarf2out_frame_init ();
2373 #ifdef DWARF2_DEBUGGING_INFO
2374 if (write_symbols
== DWARF2_DEBUG
)
2375 dwarf2out_init (asm_out_file
, main_input_filename
);
2377 timevar_pop (TV_SYMOUT
);
2379 /* Initialize yet another pass. */
2381 init_final (main_input_filename
);
2382 init_branch_prob (dump_base_name
);
2384 timevar_push (TV_PARSE
);
2386 /* Call the parser, which parses the entire file
2387 (calling rest_of_compilation for each function). */
2389 if (yyparse () != 0)
2391 if (errorcount
== 0)
2392 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2394 /* In case there were missing closebraces,
2395 get us back to the global binding level. */
2396 while (! global_bindings_p ())
2400 /* Compilation is now finished except for writing
2401 what's left of the symbol table output. */
2403 timevar_pop (TV_PARSE
);
2405 if (flag_syntax_only
)
2408 globals
= getdecls ();
2410 /* Really define vars that have had only a tentative definition.
2411 Really output inline functions that must actually be callable
2412 and have not been output so far. */
2415 int len
= list_length (globals
);
2416 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2420 /* Process the decls in reverse order--earliest first.
2421 Put them into VEC from back to front, then take out from front. */
2423 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2424 vec
[len
- i
- 1] = decl
;
2426 wrapup_global_declarations (vec
, len
);
2428 /* This must occur after the loop to output deferred functions. Else
2429 the profiler initializer would not be emitted if all the functions
2430 in this compilation unit were deferred.
2432 output_func_start_profiler can not cause any additional functions or
2433 data to need to be output, so it need not be in the deferred function
2435 output_func_start_profiler ();
2437 /* Now that all possible functions have been output, we can dump
2438 the exception table. */
2440 #ifndef IA64_UNWIND_INFO
2441 output_exception_table ();
2443 free_exception_table ();
2445 check_global_declarations (vec
, len
);
2451 /* Write out any pending weak symbol declarations. */
2455 /* Do dbx symbols. */
2456 timevar_push (TV_SYMOUT
);
2457 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2458 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2459 dbxout_finish (asm_out_file
, main_input_filename
);
2462 #ifdef DWARF_DEBUGGING_INFO
2463 if (write_symbols
== DWARF_DEBUG
)
2467 #ifdef DWARF2_UNWIND_INFO
2468 if (dwarf2out_do_frame ())
2469 dwarf2out_frame_finish ();
2472 #ifdef DWARF2_DEBUGGING_INFO
2473 if (write_symbols
== DWARF2_DEBUG
)
2474 dwarf2out_finish ();
2476 timevar_pop (TV_SYMOUT
);
2478 /* Output some stuff at end of file if nec. */
2480 end_final (dump_base_name
);
2482 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2484 timevar_push (TV_DUMP
);
2485 open_dump_file (DFI_bp
, NULL
);
2489 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2490 timevar_pop (TV_DUMP
);
2494 ASM_FILE_END (asm_out_file
);
2497 /* Language-specific end of compilation actions. */
2499 if (lang_hooks
.finish
)
2500 (*lang_hooks
.finish
) ();
2502 /* Close the dump files. */
2504 if (flag_gen_aux_info
)
2506 fclose (aux_info_file
);
2508 unlink (aux_info_file_name
);
2511 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2513 timevar_push (TV_DUMP
);
2514 dump_combine_total_stats (rtl_dump_file
);
2515 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2516 timevar_pop (TV_DUMP
);
2519 /* Close non-debugging input and output files. Take special care to note
2520 whether fclose returns an error, since the pages might still be on the
2521 buffer chain while the file is open. */
2525 if (ferror (asm_out_file
) != 0)
2526 fatal_io_error ("error writing to %s", asm_file_name
);
2527 if (fclose (asm_out_file
) != 0)
2528 fatal_io_error ("error closing %s", asm_file_name
);
2530 /* Do whatever is necessary to finish printing the graphs. */
2531 if (graph_dump_format
!= no_graph
)
2535 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2536 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2541 sprintf (seq
, ".%02d.", i
);
2542 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2543 finish_graph_dump_file (dump_base_name
, suffix
);
2550 ggc_print_statistics ();
2551 stringpool_statistics ();
2554 /* Free up memory for the benefit of leak detectors. */
2557 /* Stop timing total execution time. */
2558 timevar_stop (TV_TOTAL
);
2560 /* Print the times. */
2562 timevar_print (stderr
);
2565 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2566 and TYPE_DECL nodes.
2568 This does nothing for local (non-static) variables, unless the
2569 variable is a register variable with an ASMSPEC. In that case, or
2570 if the variable is not an automatice, it sets up the RTL and
2571 outputs any assembler code (label definition, storage allocation
2572 and initialization).
2574 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2575 the assembler symbol name to be used. TOP_LEVEL is nonzero
2576 if this declaration is not within a function. */
2579 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2581 const char *asmspec
;
2585 /* Declarations of variables, and of functions defined elsewhere. */
2587 /* The most obvious approach, to put an #ifndef around where
2588 this macro is used, doesn't work since it's inside a macro call. */
2589 #ifndef ASM_FINISH_DECLARE_OBJECT
2590 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2593 /* Forward declarations for nested functions are not "external",
2594 but we need to treat them as if they were. */
2595 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2596 || TREE_CODE (decl
) == FUNCTION_DECL
)
2598 timevar_push (TV_VARCONST
);
2600 make_decl_rtl (decl
, asmspec
);
2601 /* Initialized extern variable exists to be replaced
2602 with its value, or represents something that will be
2603 output in another file. */
2604 if (! (TREE_CODE (decl
) == VAR_DECL
2605 && DECL_EXTERNAL (decl
) && TREE_READONLY (decl
)
2606 && DECL_INITIAL (decl
) != 0
2607 && DECL_INITIAL (decl
) != error_mark_node
))
2608 /* Don't output anything
2609 when a tentative file-scope definition is seen.
2610 But at end of compilation, do output code for them. */
2611 if (! (! at_end
&& top_level
2612 && (DECL_INITIAL (decl
) == 0
2613 || DECL_INITIAL (decl
) == error_mark_node
)))
2614 assemble_variable (decl
, top_level
, at_end
, 0);
2615 if (decl
== last_assemble_variable_decl
)
2617 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2620 timevar_pop (TV_VARCONST
);
2622 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2624 if (decode_reg_name (asmspec
) >= 0)
2626 SET_DECL_RTL (decl
, NULL_RTX
);
2627 make_decl_rtl (decl
, asmspec
);
2631 error ("invalid register name `%s' for register variable", asmspec
);
2632 DECL_REGISTER (decl
) = 0;
2637 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2638 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2639 && TREE_CODE (decl
) == TYPE_DECL
)
2641 timevar_push (TV_SYMOUT
);
2642 dbxout_symbol (decl
, 0);
2643 timevar_pop (TV_SYMOUT
);
2646 #ifdef SDB_DEBUGGING_INFO
2647 else if (write_symbols
== SDB_DEBUG
&& top_level
2648 && TREE_CODE (decl
) == TYPE_DECL
)
2650 timevar_push (TV_SYMOUT
);
2651 sdbout_symbol (decl
, 0);
2652 timevar_pop (TV_SYMOUT
);
2657 /* Called after finishing a record, union or enumeral type. */
2660 rest_of_type_compilation (type
, toplev
)
2661 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2665 tree type ATTRIBUTE_UNUSED
;
2666 int toplev ATTRIBUTE_UNUSED
;
2669 timevar_push (TV_SYMOUT
);
2670 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2671 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2672 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2674 #ifdef SDB_DEBUGGING_INFO
2675 if (write_symbols
== SDB_DEBUG
)
2676 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2678 #ifdef DWARF2_DEBUGGING_INFO
2679 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2680 dwarf2out_decl (TYPE_STUB_DECL (type
));
2682 timevar_pop (TV_SYMOUT
);
2685 /* DECL is an inline function, whose body is present, but which is not
2686 being output at this point. (We're putting that off until we need
2687 to do it.) If there are any actions that need to take place,
2688 including the emission of debugging information for the function,
2689 this is where they should go. This function may be called by
2690 language-dependent code for front-ends that do not even generate
2691 RTL for functions that don't need to be put out. */
2694 note_deferral_of_defined_inline_function (decl
)
2695 tree decl ATTRIBUTE_UNUSED
;
2697 #ifdef DWARF_DEBUGGING_INFO
2698 /* Generate the DWARF info for the "abstract" instance of a function
2699 which we may later generate inlined and/or out-of-line instances
2701 if (write_symbols
== DWARF_DEBUG
2702 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2703 && ! DECL_ABSTRACT_ORIGIN (decl
))
2705 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2706 DWARF code expects it to be set in this case. Intuitively,
2707 DECL is the function we just finished defining, so setting
2708 CURRENT_FUNCTION_DECL is sensible. */
2709 tree saved_cfd
= current_function_decl
;
2710 int was_abstract
= DECL_ABSTRACT (decl
);
2711 current_function_decl
= decl
;
2713 /* Let the DWARF code do its work. */
2714 set_decl_abstract_flags (decl
, 1);
2715 dwarfout_file_scope_decl (decl
, 0);
2717 set_decl_abstract_flags (decl
, 0);
2719 /* Reset CURRENT_FUNCTION_DECL. */
2720 current_function_decl
= saved_cfd
;
2725 /* FNDECL is an inline function which is about to be emitted out of line.
2726 Do any preparation, such as emitting abstract debug info for the inline
2727 before it gets mangled by optimization. */
2730 note_outlining_of_inline_function (fndecl
)
2733 #ifdef DWARF2_DEBUGGING_INFO
2734 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2735 the abstract description of inline functions until something tries to
2736 reference them. Force it out now, before optimizations mangle the
2738 if (write_symbols
== DWARF2_DEBUG
)
2739 dwarf2out_abstract_function (fndecl
);
2743 /* This is called from finish_function (within yyparse)
2744 after each top-level definition is parsed.
2745 It is supposed to compile that function or variable
2746 and output the assembler code for it.
2747 After we return, the tree storage is freed. */
2750 rest_of_compilation (decl
)
2756 int rebuild_label_notes_after_reload
;
2757 int register_life_up_to_date
;
2759 timevar_push (TV_REST_OF_COMPILATION
);
2761 /* Now that we're out of the frontend, we shouldn't have any more
2762 CONCATs anywhere. */
2763 generating_concat_p
= 0;
2765 /* When processing delayed functions, prepare_function_start() won't
2766 have been run to re-initialize it. */
2767 cse_not_expected
= ! optimize
;
2769 /* First, make sure that NOTE_BLOCK is set correctly for each
2770 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2771 if (!cfun
->x_whole_function_mode_p
)
2774 /* Then remove any notes we don't need. That will make iterating
2775 over the instruction sequence faster, and allow the garbage
2776 collector to reclaim the memory used by the notes. */
2777 remove_unnecessary_notes ();
2779 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2780 tree in sensible shape. So, we just recalculate it here. */
2781 if (cfun
->x_whole_function_mode_p
)
2786 /* If we are reconsidering an inline function
2787 at the end of compilation, skip the stuff for making it inline. */
2789 if (DECL_SAVED_INSNS (decl
) == 0)
2795 /* If this is nested inside an inlined external function, pretend
2796 it was only declared. Since we cannot inline such functions,
2797 generating code for this one is not only not necessary but will
2798 confuse some debugging output writers. */
2799 for (parent
= DECL_CONTEXT (current_function_decl
);
2800 parent
!= NULL_TREE
;
2801 parent
= get_containing_scope (parent
))
2802 if (TREE_CODE (parent
) == FUNCTION_DECL
2803 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2805 DECL_INITIAL (decl
) = 0;
2806 goto exit_rest_of_compilation
;
2809 /* If requested, consider whether to make this function inline. */
2810 if (DECL_INLINE (decl
) || flag_inline_functions
)
2812 timevar_push (TV_INTEGRATION
);
2813 lose
= function_cannot_inline_p (decl
);
2814 timevar_pop (TV_INTEGRATION
);
2815 if (lose
|| ! optimize
)
2817 if (warn_inline
&& DECL_INLINE (decl
))
2818 warning_with_decl (decl
, lose
);
2819 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2820 /* Don't really compile an extern inline function.
2821 If we can't make it inline, pretend
2822 it was only declared. */
2823 if (DECL_EXTERNAL (decl
))
2825 DECL_INITIAL (decl
) = 0;
2826 goto exit_rest_of_compilation
;
2830 /* ??? Note that this has the effect of making it look
2831 like "inline" was specified for a function if we choose
2832 to inline it. This isn't quite right, but it's
2833 probably not worth the trouble to fix. */
2834 inlinable
= DECL_INLINE (decl
) = 1;
2837 insns
= get_insns ();
2839 /* Dump the rtl code if we are dumping rtl. */
2841 if (open_dump_file (DFI_rtl
, decl
))
2843 if (DECL_SAVED_INSNS (decl
))
2844 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2845 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2848 /* If function is inline, and we don't yet know whether to
2849 compile it by itself, defer decision till end of compilation.
2850 finish_compilation will call rest_of_compilation again
2851 for those functions that need to be output. Also defer those
2852 functions that we are supposed to defer. */
2855 || (DECL_INLINE (decl
)
2856 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2857 && ! flag_keep_inline_functions
)
2858 || DECL_EXTERNAL (decl
))))
2859 DECL_DEFER_OUTPUT (decl
) = 1;
2861 if (DECL_INLINE (decl
))
2862 /* DWARF wants seperate debugging info for abstract and
2863 concrete instances of all inline functions, including those
2864 declared inline but not inlined, and those inlined even
2865 though they weren't declared inline. Conveniently, that's
2866 what DECL_INLINE means at this point. */
2867 note_deferral_of_defined_inline_function (decl
);
2869 if (DECL_DEFER_OUTPUT (decl
))
2871 /* If -Wreturn-type, we have to do a bit of compilation. We just
2872 want to call jump_optimize to figure out whether or not we can
2873 fall off the end of the function; we do the minimum amount of
2874 work necessary to make that safe. And, we set optimize to zero
2875 to keep jump_optimize from working too hard. */
2876 if (warn_return_type
)
2878 int saved_optimize
= optimize
;
2881 find_exception_handler_labels ();
2882 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2883 !JUMP_AFTER_REGSCAN
);
2884 optimize
= saved_optimize
;
2887 current_function_nothrow
= nothrow_function_p ();
2888 if (current_function_nothrow
)
2889 /* Now we know that this can't throw; set the flag for the benefit
2890 of other functions later in this translation unit. */
2891 TREE_NOTHROW (current_function_decl
) = 1;
2893 timevar_push (TV_INTEGRATION
);
2894 save_for_inline (decl
);
2895 timevar_pop (TV_INTEGRATION
);
2896 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2897 goto exit_rest_of_compilation
;
2900 /* If specified extern inline but we aren't inlining it, we are
2901 done. This goes for anything that gets here with DECL_EXTERNAL
2902 set, not just things with DECL_INLINE. */
2903 if (DECL_EXTERNAL (decl
))
2904 goto exit_rest_of_compilation
;
2907 init_EXPR_INSN_LIST_cache ();
2911 /* Initialize some variables used by the optimizers. */
2912 init_function_for_compilation ();
2914 if (! DECL_DEFER_OUTPUT (decl
))
2915 TREE_ASM_WRITTEN (decl
) = 1;
2917 /* Now that integrate will no longer see our rtl, we need not
2918 distinguish between the return value of this function and the
2919 return value of called functions. Also, we can remove all SETs
2920 of subregs of hard registers; they are only here because of
2922 rtx_equal_function_value_matters
= 0;
2923 purge_hard_subreg_sets (get_insns ());
2925 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2926 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2927 goto exit_rest_of_compilation
;
2929 /* Emit code to get eh context, if needed. */
2932 /* We may have potential sibling or tail recursion sites. Select one
2933 (of possibly multiple) methods of performing the call. */
2934 if (flag_optimize_sibling_calls
)
2936 timevar_push (TV_JUMP
);
2937 open_dump_file (DFI_sibling
, decl
);
2939 optimize_sibling_and_tail_recursive_calls ();
2941 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2942 timevar_pop (TV_JUMP
);
2946 /* If we are doing position-independent code generation, now
2947 is the time to output special prologues and epilogues.
2948 We do not want to do this earlier, because it just clutters
2949 up inline functions with meaningless insns. */
2954 insns
= get_insns ();
2956 /* Copy any shared structure that should not be shared. */
2957 unshare_all_rtl (current_function_decl
, insns
);
2959 #ifdef SETJMP_VIA_SAVE_AREA
2960 /* This must be performed before virutal register instantiation. */
2961 if (current_function_calls_alloca
)
2962 optimize_save_area_alloca (insns
);
2965 /* Instantiate all virtual registers. */
2966 instantiate_virtual_regs (current_function_decl
, insns
);
2968 /* Find all the EH handlers. */
2969 find_exception_handler_labels ();
2971 open_dump_file (DFI_jump
, decl
);
2973 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2974 are initialized and to compute whether control can drop off the end
2977 timevar_push (TV_JUMP
);
2978 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2979 before jump optimization switches branch directions. */
2980 expected_value_to_br_prob ();
2982 reg_scan (insns
, max_reg_num (), 0);
2983 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2984 JUMP_AFTER_REGSCAN
);
2986 timevar_pop (TV_JUMP
);
2988 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2989 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2991 close_dump_file (DFI_jump
, print_rtl
, insns
);
2992 goto exit_rest_of_compilation
;
2995 timevar_push (TV_JUMP
);
2999 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3000 cleanup_cfg (insns
);
3002 /* ??? Run if-conversion before delete_null_pointer_checks,
3003 since the later does not preserve the CFG. This should
3004 be changed -- no since converting if's that are going to
3006 timevar_push (TV_IFCVT
);
3008 timevar_pop (TV_IFCVT
);
3010 /* Try to identify useless null pointer tests and delete them. */
3011 if (flag_delete_null_pointer_checks
)
3012 delete_null_pointer_checks (insns
);
3015 /* Jump optimization, and the removal of NULL pointer checks, may
3016 have reduced the number of instructions substantially. CSE, and
3017 future passes, allocate arrays whose dimensions involve the
3018 maximum instruction UID, so if we can reduce the maximum UID
3019 we'll save big on memory. */
3020 renumber_insns (rtl_dump_file
);
3021 timevar_pop (TV_JUMP
);
3023 close_dump_file (DFI_jump
, print_rtl
, insns
);
3027 /* Perform common subexpression elimination.
3028 Nonzero value from `cse_main' means that jumps were simplified
3029 and some code may now be unreachable, so do
3030 jump optimization again. */
3034 open_dump_file (DFI_cse
, decl
);
3035 timevar_push (TV_CSE
);
3037 reg_scan (insns
, max_reg_num (), 1);
3039 if (flag_thread_jumps
)
3041 timevar_push (TV_JUMP
);
3042 thread_jumps (insns
, max_reg_num (), 1);
3043 timevar_pop (TV_JUMP
);
3046 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3048 /* If we are not running the second CSE pass, then we are no longer
3049 expecting CSE to be run. */
3050 cse_not_expected
= !flag_rerun_cse_after_loop
;
3052 if (tem
|| optimize
> 1)
3054 timevar_push (TV_JUMP
);
3055 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3056 !JUMP_AFTER_REGSCAN
);
3057 timevar_pop (TV_JUMP
);
3060 /* Run this after jump optmizations remove all the unreachable code
3061 so that unreachable code will not keep values live. */
3062 delete_trivially_dead_insns (insns
, max_reg_num ());
3064 /* Try to identify useless null pointer tests and delete them. */
3065 if (flag_delete_null_pointer_checks
)
3067 timevar_push (TV_JUMP
);
3068 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3070 cleanup_cfg (insns
);
3072 delete_null_pointer_checks (insns
);
3073 timevar_pop (TV_JUMP
);
3076 /* The second pass of jump optimization is likely to have
3077 removed a bunch more instructions. */
3078 renumber_insns (rtl_dump_file
);
3080 timevar_pop (TV_CSE
);
3081 close_dump_file (DFI_cse
, print_rtl
, insns
);
3084 open_dump_file (DFI_addressof
, decl
);
3086 purge_addressof (insns
);
3087 reg_scan (insns
, max_reg_num (), 1);
3089 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3093 if (optimize
> 0 && flag_ssa
)
3095 /* Convert to SSA form. */
3097 timevar_push (TV_TO_SSA
);
3098 open_dump_file (DFI_ssa
, decl
);
3100 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3101 cleanup_cfg (insns
);
3104 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3105 timevar_pop (TV_TO_SSA
);
3107 /* The SSA implementation uses basic block numbers in its phi
3108 nodes. Thus, changing the control-flow graph or the basic
3109 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3110 may cause problems. */
3114 /* Remove dead code. */
3116 timevar_push (TV_DEAD_CODE_ELIM
);
3117 open_dump_file (DFI_dce
, decl
);
3119 insns
= get_insns ();
3120 eliminate_dead_code();
3122 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3123 timevar_pop (TV_DEAD_CODE_ELIM
);
3126 /* Convert from SSA form. */
3128 timevar_push (TV_FROM_SSA
);
3129 open_dump_file (DFI_ussa
, decl
);
3131 convert_from_ssa ();
3132 /* New registers have been created. Rescan their usage. */
3133 reg_scan (insns
, max_reg_num (), 1);
3134 /* Life analysis used in SSA adds log_links but these
3135 shouldn't be there until the flow stage, so clear
3137 clear_log_links (insns
);
3139 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3140 timevar_pop (TV_FROM_SSA
);
3145 /* Perform global cse. */
3147 if (optimize
> 0 && flag_gcse
)
3149 timevar_push (TV_GCSE
);
3150 open_dump_file (DFI_gcse
, decl
);
3152 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3153 cleanup_cfg (insns
);
3154 tem
= gcse_main (insns
, rtl_dump_file
);
3156 /* If gcse altered any jumps, rerun jump optimizations to clean
3160 timevar_push (TV_JUMP
);
3161 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3162 !JUMP_AFTER_REGSCAN
);
3163 timevar_pop (TV_JUMP
);
3166 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3167 timevar_pop (TV_GCSE
);
3172 /* Move constant computations out of loops. */
3176 timevar_push (TV_LOOP
);
3177 open_dump_file (DFI_loop
, decl
);
3179 if (flag_rerun_loop_opt
)
3181 /* We only want to perform unrolling once. */
3183 loop_optimize (insns
, rtl_dump_file
, 0);
3185 /* The first call to loop_optimize makes some instructions
3186 trivially dead. We delete those instructions now in the
3187 hope that doing so will make the heuristics in loop work
3188 better and possibly speed up compilation. */
3189 delete_trivially_dead_insns (insns
, max_reg_num ());
3191 /* The regscan pass is currently necessary as the alias
3192 analysis code depends on this information. */
3193 reg_scan (insns
, max_reg_num (), 1);
3195 loop_optimize (insns
, rtl_dump_file
,
3196 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3198 close_dump_file (DFI_loop
, print_rtl
, insns
);
3199 timevar_pop (TV_LOOP
);
3206 timevar_push (TV_CSE2
);
3207 open_dump_file (DFI_cse2
, decl
);
3209 if (flag_rerun_cse_after_loop
)
3211 /* Running another jump optimization pass before the second
3212 cse pass sometimes simplifies the RTL enough to allow
3213 the second CSE pass to do a better job. Jump_optimize can change
3214 max_reg_num so we must rerun reg_scan afterwards.
3215 ??? Rework to not call reg_scan so often. */
3216 timevar_push (TV_JUMP
);
3218 reg_scan (insns
, max_reg_num (), 0);
3219 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3220 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3222 timevar_push (TV_IFCVT
);
3224 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3225 cleanup_cfg (insns
);
3228 timevar_pop(TV_IFCVT
);
3230 timevar_pop (TV_JUMP
);
3232 reg_scan (insns
, max_reg_num (), 0);
3233 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3237 timevar_push (TV_JUMP
);
3238 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3239 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3240 timevar_pop (TV_JUMP
);
3244 if (flag_thread_jumps
)
3246 /* This pass of jump threading straightens out code
3247 that was kinked by loop optimization. */
3248 timevar_push (TV_JUMP
);
3249 reg_scan (insns
, max_reg_num (), 0);
3250 thread_jumps (insns
, max_reg_num (), 0);
3251 timevar_pop (TV_JUMP
);
3254 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3255 timevar_pop (TV_CSE2
);
3260 cse_not_expected
= 1;
3264 /* Do control and data flow analysis; wrote some of the results to
3267 timevar_push (TV_FLOW
);
3268 open_dump_file (DFI_cfg
, decl
);
3270 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3271 cleanup_cfg (insns
);
3272 check_function_return_warnings ();
3274 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3276 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3278 timevar_push (TV_BRANCH_PROB
);
3279 open_dump_file (DFI_bp
, decl
);
3283 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3284 timevar_pop (TV_BRANCH_PROB
);
3287 open_dump_file (DFI_life
, decl
);
3292 /* Discover and record the loop depth at the head of each basic
3293 block. The loop infrastructure does the real job for us. */
3294 flow_loops_find (&loops
, LOOP_TREE
);
3296 /* Estimate using heuristics if no profiling info is available. */
3297 if (flag_guess_branch_prob
)
3298 estimate_probability (&loops
);
3301 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3303 flow_loops_free (&loops
);
3305 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3306 mark_constant_function ();
3307 timevar_pop (TV_FLOW
);
3309 register_life_up_to_date
= 1;
3312 if (warn_uninitialized
|| extra_warnings
)
3314 uninitialized_vars_warning (DECL_INITIAL (decl
));
3316 setjmp_args_warning ();
3319 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3323 /* If -opt, try combining insns through substitution. */
3327 int rebuild_jump_labels_after_combine
= 0;
3329 timevar_push (TV_COMBINE
);
3330 open_dump_file (DFI_combine
, decl
);
3332 rebuild_jump_labels_after_combine
3333 = combine_instructions (insns
, max_reg_num ());
3335 /* Combining insns may have turned an indirect jump into a
3336 direct jump. Rebuid the JUMP_LABEL fields of jumping
3338 if (rebuild_jump_labels_after_combine
)
3340 timevar_push (TV_JUMP
);
3341 rebuild_jump_labels (insns
);
3342 timevar_pop (TV_JUMP
);
3344 timevar_push (TV_FLOW
);
3345 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3346 cleanup_cfg (insns
);
3348 /* Blimey. We've got to have the CFG up to date for the call to
3349 if_convert below. However, the random deletion of blocks
3350 without updating life info can wind up with Wierd Stuff in
3351 global_live_at_end. We then run sched1, which updates things
3352 properly, discovers the wierdness and aborts. */
3353 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3354 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3355 | PROP_SCAN_DEAD_CODE
);
3357 timevar_pop (TV_FLOW
);
3360 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3361 timevar_pop (TV_COMBINE
);
3366 /* Rerun if-conversion, as combine may have simplified things enough to
3367 now meet sequence length restrictions. */
3370 timevar_push (TV_IFCVT
);
3371 open_dump_file (DFI_ce
, decl
);
3377 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3378 timevar_pop (TV_IFCVT
);
3381 /* Register allocation pre-pass, to reduce number of moves
3382 necessary for two-address machines. */
3383 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3385 timevar_push (TV_REGMOVE
);
3386 open_dump_file (DFI_regmove
, decl
);
3388 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3390 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3391 timevar_pop (TV_REGMOVE
);
3396 /* Any of the several passes since flow1 will have munged register
3397 lifetime data a bit. */
3399 register_life_up_to_date
= 0;
3401 #ifdef OPTIMIZE_MODE_SWITCHING
3402 timevar_push (TV_GCSE
);
3404 if (optimize_mode_switching (NULL_PTR
))
3406 /* We did work, and so had to regenerate global life information.
3407 Take advantage of this and don't re-recompute register life
3408 information below. */
3409 register_life_up_to_date
= 1;
3412 timevar_pop (TV_GCSE
);
3415 #ifdef INSN_SCHEDULING
3417 /* Print function header into sched dump now
3418 because doing the sched analysis makes some of the dump. */
3419 if (optimize
> 0 && flag_schedule_insns
)
3421 timevar_push (TV_SCHED
);
3422 open_dump_file (DFI_sched
, decl
);
3424 /* Do control and data sched analysis,
3425 and write some of the results to dump file. */
3427 schedule_insns (rtl_dump_file
);
3429 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3430 timevar_pop (TV_SCHED
);
3434 /* Register lifetime information was updated as part of verifying
3436 register_life_up_to_date
= 1;
3440 /* Determine if the current function is a leaf before running reload
3441 since this can impact optimizations done by the prologue and
3442 epilogue thus changing register elimination offsets. */
3443 current_function_is_leaf
= leaf_function_p ();
3445 timevar_push (TV_LOCAL_ALLOC
);
3446 open_dump_file (DFI_lreg
, decl
);
3448 /* Allocate pseudo-regs that are used only within 1 basic block.
3450 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3451 jump optimizer after register allocation and reloading are finished. */
3453 if (! register_life_up_to_date
)
3454 recompute_reg_usage (insns
, ! optimize_size
);
3455 regclass (insns
, max_reg_num (), rtl_dump_file
);
3456 rebuild_label_notes_after_reload
= local_alloc ();
3458 timevar_pop (TV_LOCAL_ALLOC
);
3460 if (dump_file
[DFI_lreg
].enabled
)
3462 timevar_push (TV_DUMP
);
3464 dump_flow_info (rtl_dump_file
);
3465 dump_local_alloc (rtl_dump_file
);
3467 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3468 timevar_pop (TV_DUMP
);
3473 timevar_push (TV_GLOBAL_ALLOC
);
3474 open_dump_file (DFI_greg
, decl
);
3476 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3477 pass fixing up any insns that are invalid. */
3480 failure
= global_alloc (rtl_dump_file
);
3483 build_insn_chain (insns
);
3484 failure
= reload (insns
, 0);
3487 timevar_pop (TV_GLOBAL_ALLOC
);
3489 if (dump_file
[DFI_greg
].enabled
)
3491 timevar_push (TV_DUMP
);
3493 dump_global_regs (rtl_dump_file
);
3495 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3496 timevar_pop (TV_DUMP
);
3500 goto exit_rest_of_compilation
;
3504 open_dump_file (DFI_postreload
, decl
);
3506 /* Do a very simple CSE pass over just the hard registers. */
3509 timevar_push (TV_RELOAD_CSE_REGS
);
3510 reload_cse_regs (insns
);
3511 timevar_pop (TV_RELOAD_CSE_REGS
);
3514 /* If optimizing, then go ahead and split insns now since we are about
3515 to recompute flow information anyway. */
3518 int old_labelnum
= max_label_num ();
3520 split_all_insns (0);
3521 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3524 /* Register allocation and reloading may have turned an indirect jump into
3525 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3526 jumping instructions. */
3527 if (rebuild_label_notes_after_reload
)
3529 timevar_push (TV_JUMP
);
3531 rebuild_jump_labels (insns
);
3533 timevar_pop (TV_JUMP
);
3536 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3538 /* Re-create the death notes which were deleted during reload. */
3539 timevar_push (TV_FLOW2
);
3540 open_dump_file (DFI_flow2
, decl
);
3542 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3543 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3544 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3546 /* On some machines, the prologue and epilogue code, or parts thereof,
3547 can be represented as RTL. Doing so lets us schedule insns between
3548 it and the rest of the code and also allows delayed branch
3549 scheduling to operate in the epilogue. */
3550 thread_prologue_and_epilogue_insns (insns
);
3554 cleanup_cfg (insns
);
3555 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3557 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3558 even for machines with possibly nonzero RETURN_POPS_ARGS
3559 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3560 push instructions will have popping returns. */
3561 #ifndef PUSH_ROUNDING
3562 if (!ACCUMULATE_OUTGOING_ARGS
)
3564 combine_stack_adjustments ();
3569 flow2_completed
= 1;
3571 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3572 timevar_pop (TV_FLOW2
);
3574 #ifdef HAVE_peephole2
3575 if (optimize
> 0 && flag_peephole2
)
3577 timevar_push (TV_PEEPHOLE2
);
3578 open_dump_file (DFI_peephole2
, decl
);
3580 peephole2_optimize (rtl_dump_file
);
3582 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3583 timevar_pop (TV_PEEPHOLE2
);
3587 if (optimize
> 0 && flag_rename_registers
)
3589 timevar_push (TV_RENAME_REGISTERS
);
3590 open_dump_file (DFI_rnreg
, decl
);
3592 regrename_optimize ();
3594 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3595 timevar_pop (TV_RENAME_REGISTERS
);
3600 timevar_push (TV_IFCVT2
);
3601 open_dump_file (DFI_ce2
, decl
);
3605 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3606 timevar_pop (TV_IFCVT2
);
3609 #ifdef INSN_SCHEDULING
3610 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3612 timevar_push (TV_SCHED2
);
3613 open_dump_file (DFI_sched2
, decl
);
3615 /* Do control and data sched analysis again,
3616 and write some more of the results to dump file. */
3618 schedule_insns (rtl_dump_file
);
3620 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3621 timevar_pop (TV_SCHED2
);
3627 #ifdef LEAF_REGISTERS
3628 current_function_uses_only_leaf_regs
3629 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3632 if (optimize
> 0 && flag_reorder_blocks
)
3634 timevar_push (TV_REORDER_BLOCKS
);
3635 open_dump_file (DFI_bbro
, decl
);
3637 reorder_basic_blocks ();
3639 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3640 timevar_pop (TV_REORDER_BLOCKS
);
3643 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3644 Also do cross-jumping this time and delete no-op move insns. */
3648 timevar_push (TV_JUMP
);
3649 open_dump_file (DFI_jump2
, decl
);
3651 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3652 !JUMP_AFTER_REGSCAN
);
3654 /* CFG no longer kept up to date. */
3656 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3657 timevar_pop (TV_JUMP
);
3660 /* If a machine dependent reorganization is needed, call it. */
3661 #ifdef MACHINE_DEPENDENT_REORG
3662 open_dump_file (DFI_mach
, decl
);
3664 MACHINE_DEPENDENT_REORG (insns
);
3666 close_dump_file (DFI_mach
, print_rtl
, insns
);
3671 /* If a scheduling pass for delayed branches is to be done,
3672 call the scheduling code. */
3675 if (optimize
> 0 && flag_delayed_branch
)
3677 timevar_push (TV_DBR_SCHED
);
3678 open_dump_file (DFI_dbr
, decl
);
3680 dbr_schedule (insns
, rtl_dump_file
);
3682 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3683 timevar_pop (TV_DBR_SCHED
);
3689 /* Shorten branches.
3691 Note this must run before reg-stack because of death note (ab)use
3692 in the ia32 backend. */
3693 timevar_push (TV_SHORTEN_BRANCH
);
3694 shorten_branches (get_insns ());
3695 timevar_pop (TV_SHORTEN_BRANCH
);
3698 timevar_push (TV_REG_STACK
);
3699 open_dump_file (DFI_stack
, decl
);
3701 reg_to_stack (insns
, rtl_dump_file
);
3703 close_dump_file (DFI_stack
, print_rtl
, insns
);
3704 timevar_pop (TV_REG_STACK
);
3709 current_function_nothrow
= nothrow_function_p ();
3710 if (current_function_nothrow
)
3711 /* Now we know that this can't throw; set the flag for the benefit
3712 of other functions later in this translation unit. */
3713 TREE_NOTHROW (current_function_decl
) = 1;
3715 /* Now turn the rtl into assembler code. */
3717 timevar_push (TV_FINAL
);
3722 /* Get the function's name, as described by its RTL. This may be
3723 different from the DECL_NAME name used in the source file. */
3725 x
= DECL_RTL (decl
);
3726 if (GET_CODE (x
) != MEM
)
3729 if (GET_CODE (x
) != SYMBOL_REF
)
3731 fnname
= XSTR (x
, 0);
3733 assemble_start_function (decl
, fnname
);
3734 final_start_function (insns
, asm_out_file
, optimize
);
3735 final (insns
, asm_out_file
, optimize
, 0);
3736 final_end_function (insns
, asm_out_file
, optimize
);
3737 assemble_end_function (decl
, fnname
);
3739 fflush (asm_out_file
);
3741 /* Release all memory allocated by flow. */
3742 free_basic_block_vars (0);
3744 /* Release all memory held by regsets now. */
3745 regset_release_memory ();
3747 timevar_pop (TV_FINAL
);
3751 /* Write DBX symbols if requested. */
3753 /* Note that for those inline functions where we don't initially
3754 know for certain that we will be generating an out-of-line copy,
3755 the first invocation of this routine (rest_of_compilation) will
3756 skip over this code by doing a `goto exit_rest_of_compilation;'.
3757 Later on, finish_compilation will call rest_of_compilation again
3758 for those inline functions that need to have out-of-line copies
3759 generated. During that call, we *will* be routed past here. */
3761 timevar_push (TV_SYMOUT
);
3762 #ifdef DBX_DEBUGGING_INFO
3763 if (write_symbols
== DBX_DEBUG
)
3764 dbxout_function (decl
);
3767 #ifdef DWARF_DEBUGGING_INFO
3768 if (write_symbols
== DWARF_DEBUG
)
3769 dwarfout_file_scope_decl (decl
, 0);
3772 #ifdef DWARF2_DEBUGGING_INFO
3773 if (write_symbols
== DWARF2_DEBUG
)
3774 dwarf2out_decl (decl
);
3776 timevar_pop (TV_SYMOUT
);
3778 exit_rest_of_compilation
:
3780 /* In case the function was not output,
3781 don't leave any temporary anonymous types
3782 queued up for sdb output. */
3783 #ifdef SDB_DEBUGGING_INFO
3784 if (write_symbols
== SDB_DEBUG
)
3785 sdbout_types (NULL_TREE
);
3788 reload_completed
= 0;
3789 flow2_completed
= 0;
3792 timevar_push (TV_FINAL
);
3794 /* Clear out the insn_length contents now that they are no
3796 init_insn_lengths ();
3798 /* Clear out the real_constant_chain before some of the rtx's
3799 it runs through become garbage. */
3800 clear_const_double_mem ();
3802 /* Show no temporary slots allocated. */
3805 free_basic_block_vars (0);
3807 timevar_pop (TV_FINAL
);
3809 /* Make sure volatile mem refs aren't considered valid operands for
3810 arithmetic insns. We must call this here if this is a nested inline
3811 function, since the above code leaves us in the init_recog state
3812 (from final.c), and the function context push/pop code does not
3813 save/restore volatile_ok.
3815 ??? Maybe it isn't necessary for expand_start_function to call this
3816 anymore if we do it here? */
3818 init_recog_no_volatile ();
3820 /* We're done with this function. Free up memory if we can. */
3821 free_after_parsing (cfun
);
3822 if (! DECL_DEFER_OUTPUT (decl
))
3823 free_after_compilation (cfun
);
3828 timevar_pop (TV_REST_OF_COMPILATION
);
3838 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3839 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3840 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3841 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3842 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3843 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"));
3845 for (i
= ARRAY_SIZE (f_options
); i
--;)
3847 const char *description
= f_options
[i
].description
;
3849 if (description
!= NULL
&& * description
!= 0)
3850 printf (" -f%-21s %s\n",
3851 f_options
[i
].string
, description
);
3854 printf (_(" -O[number] Set optimisation level to [number]\n"));
3855 printf (_(" -Os Optimise for space rather than speed\n"));
3856 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3857 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3858 printf (_(" -w Suppress warnings\n"));
3859 printf (_(" -W Enable extra warnings\n"));
3861 for (i
= ARRAY_SIZE (W_options
); i
--;)
3863 const char *description
= W_options
[i
].description
;
3865 if (description
!= NULL
&& * description
!= 0)
3866 printf (" -W%-21s %s\n",
3867 W_options
[i
].string
, description
);
3870 printf (_(" -Wunused Enable unused warnings\n"));
3871 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3872 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3873 printf (_(" -p Enable function profiling\n"));
3874 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3875 printf (_(" -a Enable block profiling \n"));
3877 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3878 printf (_(" -ax Enable jump profiling \n"));
3880 printf (_(" -o <file> Place output into <file> \n"));
3882 -G <number> Put global and static data smaller than <number>\n\
3883 bytes into a special section (on some targets)\n"));
3885 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3887 if (debug_args
[i
].description
!= NULL
)
3888 printf (" -g%-21s %s\n",
3889 debug_args
[i
].arg
, debug_args
[i
].description
);
3892 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3893 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3894 printf (_(" -version Display the compiler's version\n"));
3895 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3896 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3897 #if defined INSN_SCHEDULING
3898 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3900 printf (_(" --help Display this information\n"));
3905 /* Display descriptions of language specific options.
3906 If there is no description, note that there is an undocumented option.
3907 If the description is empty, do not display anything. (This allows
3908 options to be deliberately undocumented, for whatever reason).
3909 If the option string is missing, then this is a marker, indicating
3910 that the description string is in fact the name of a language, whose
3911 language specific options are to follow. */
3913 if (ARRAY_SIZE (documented_lang_options
) > 1)
3915 printf (_("\nLanguage specific options:\n"));
3917 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3919 const char *description
= documented_lang_options
[i
].description
;
3920 const char *option
= documented_lang_options
[i
].option
;
3922 if (description
== NULL
)
3927 printf (_(" %-23.23s [undocumented]\n"), option
);
3929 else if (*description
== 0)
3931 else if (option
== NULL
)
3935 (_("\nThere are undocumented %s specific options as well.\n"),
3939 printf (_("\n Options for %s:\n"), description
);
3944 printf (" %-23.23s %s\n", option
, description
);
3949 printf (_("\nThere are undocumented %s specific options as well.\n"),
3952 display_target_options ();
3956 display_target_options ()
3960 if (ARRAY_SIZE (target_switches
) > 1
3961 #ifdef TARGET_OPTIONS
3962 || ARRAY_SIZE (target_options
) > 1
3970 printf (_("\nTarget specific options:\n"));
3972 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3974 const char *option
= target_switches
[i
].name
;
3975 const char *description
= target_switches
[i
].description
;
3977 if (option
== NULL
|| *option
== 0)
3979 else if (description
== NULL
)
3984 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3986 else if (* description
!= 0)
3987 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3990 #ifdef TARGET_OPTIONS
3991 for (i
= ARRAY_SIZE (target_options
); i
--;)
3993 const char *option
= target_options
[i
].prefix
;
3994 const char *description
= target_options
[i
].description
;
3996 if (option
== NULL
|| *option
== 0)
3998 else if (description
== NULL
)
4003 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4005 else if (* description
!= 0)
4006 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
4012 printf (_("\nThere are undocumented target specific options as well.\n"));
4014 printf (_(" They exist, but they are not documented.\n"));
4019 /* Parse a -d... comand line switch. */
4022 decode_d_option (arg
)
4031 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4032 dump_file
[i
].enabled
= 1;
4041 flag_print_asm_name
= 1;
4044 flag_dump_rtl_in_asm
= 1;
4045 flag_print_asm_name
= 1;
4048 graph_dump_format
= vcg
;
4051 rtl_dump_and_exit
= 1;
4056 case 'D': /* These are handled by the preprocessor. */
4062 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4063 if (c
== dump_file
[i
].debug_switch
)
4065 dump_file
[i
].enabled
= 1;
4070 warning ("unrecognized gcc debugging option: %c", c
);
4075 /* Parse a -f... comand line switch. ARG is the value after the -f.
4076 It is safe to access 'ARG - 2' to generate the full switch name.
4077 Return the number of strings consumed. */
4080 decode_f_option (arg
)
4084 const char *option_value
= NULL
;
4086 /* Search for the option in the table of binary f options. */
4087 for (j
= ARRAY_SIZE (f_options
); j
--;)
4089 if (!strcmp (arg
, f_options
[j
].string
))
4091 *f_options
[j
].variable
= f_options
[j
].on_value
;
4095 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4096 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4098 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4103 if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4104 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4107 read_integral_parameter (option_value
, arg
- 2,
4109 set_param_value ("max-inline-insns", val
);
4111 #ifdef INSN_SCHEDULING
4112 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4113 fix_sched_param ("verbose", option_value
);
4115 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4116 fix_register (option_value
, 1, 1);
4117 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4118 fix_register (option_value
, 0, 1);
4119 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4120 fix_register (option_value
, 0, 0);
4121 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4122 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4123 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4125 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4126 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4127 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4128 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4130 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4131 else if ((option_value
4132 = skip_leading_substring (arg
, "stack-limit-register=")))
4134 int reg
= decode_reg_name (option_value
);
4136 error ("unrecognized register name `%s'", option_value
);
4138 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4140 else if ((option_value
4141 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4144 nm
= ggc_strdup (option_value
);
4145 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4147 else if ((option_value
4148 = skip_leading_substring (arg
, "message-length=")))
4149 diagnostic_message_length_per_line
=
4150 read_integral_parameter (option_value
, arg
- 2,
4151 diagnostic_message_length_per_line
);
4152 else if ((option_value
4153 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4155 if (!strcmp (option_value
, "once"))
4156 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4157 else if (!strcmp (option_value
, "every-line"))
4158 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4160 error ("Unrecognized option `%s'", arg
- 2);
4162 else if (!strcmp (arg
, "no-stack-limit"))
4163 stack_limit_rtx
= NULL_RTX
;
4164 else if (!strcmp (arg
, "preprocessed"))
4165 /* Recognise this switch but do nothing. This prevents warnings
4166 about an unrecognized switch if cpplib has not been linked in. */
4174 /* Parse a -W... comand line switch. ARG is the value after the -W.
4175 It is safe to access 'ARG - 2' to generate the full switch name.
4176 Return the number of strings consumed. */
4179 decode_W_option (arg
)
4182 const char *option_value
= NULL
;
4185 /* Search for the option in the table of binary W options. */
4187 for (j
= ARRAY_SIZE (W_options
); j
--;)
4189 if (!strcmp (arg
, W_options
[j
].string
))
4191 *W_options
[j
].variable
= W_options
[j
].on_value
;
4195 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4196 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4198 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4203 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4205 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4207 if (id_clash_len
!= -1)
4210 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4212 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4214 warn_larger_than
= larger_than_size
!= -1;
4216 else if (!strcmp (arg
, "unused"))
4220 else if (!strcmp (arg
, "no-unused"))
4230 /* Parse a -g... comand line switch. ARG is the value after the -g.
4231 It is safe to access 'ARG - 2' to generate the full switch name.
4232 Return the number of strings consumed. */
4235 decode_g_option (arg
)
4239 /* A lot of code assumes write_symbols == NO_DEBUG if the
4240 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4241 of what debugging type has been selected). This records the
4242 selected type. It is an error to specify more than one
4244 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4245 /* Non-zero if debugging format has been explicitly set.
4246 -g and -ggdb don't explicitly set the debugging format so
4247 -gdwarf -g3 is equivalent to -gdwarf3. */
4248 static int type_explicitly_set_p
= 0;
4249 /* Indexed by enum debug_info_type. */
4250 static const char *debug_type_names
[] =
4252 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4255 /* The maximum admissible debug level value. */
4256 static const unsigned max_debug_level
= 3;
4258 /* Look up ARG in the table. */
4259 for (da
= debug_args
; da
->arg
; da
++)
4261 const int da_len
= strlen (da
->arg
);
4263 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4265 enum debug_info_type type
= da
->debug_type
;
4266 const char *p
= arg
+ da_len
;
4268 if (*p
&& (*p
< '0' || *p
> '9'))
4271 /* A debug flag without a level defaults to level 2.
4272 Note we do not want to call read_integral_parameter
4273 for that case since it will call atoi which
4276 ??? We may want to generalize the interface to
4277 read_integral_parameter to better handle this case
4278 if this case shows up often. */
4280 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4284 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4286 error ("use -gdwarf -g%d for DWARF v1, level %d",
4289 error ("use -gdwarf-2 for DWARF v2");
4292 if (level
> max_debug_level
)
4295 ignoring option `%s' due to invalid debug level specification",
4297 level
= debug_info_level
;
4300 if (type
== NO_DEBUG
)
4302 type
= PREFERRED_DEBUGGING_TYPE
;
4304 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4306 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4307 type
= DWARF2_DEBUG
;
4309 #ifdef DBX_DEBUGGING_INFO
4316 if (type
== NO_DEBUG
)
4317 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4319 /* Does it conflict with an already selected type? */
4320 if (type_explicitly_set_p
4321 /* -g/-ggdb don't conflict with anything. */
4322 && da
->debug_type
!= NO_DEBUG
4323 && type
!= selected_debug_type
)
4324 warning ("`%s' ignored, conflicts with `-g%s'",
4325 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4328 /* If the format has already been set, -g/-ggdb
4329 only change the debug level. */
4330 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4331 /* Don't change debugging type. */
4335 selected_debug_type
= type
;
4336 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4339 write_symbols
= (level
== 0
4341 : selected_debug_type
);
4342 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4343 debug_info_level
= (enum debug_info_level
) level
;
4356 /* Decode the first argument in the argv as a language-independent option.
4357 Return the number of strings consumed. */
4360 independent_decode_option (argc
, argv
)
4364 char *arg
= argv
[0];
4366 if (arg
[0] != '-' || arg
[1] == 0)
4378 if (!strcmp (arg
, "-help"))
4381 exit_after_options
= 1;
4384 if (!strcmp (arg
, "-target-help"))
4386 display_target_options ();
4387 exit_after_options
= 1;
4390 if (!strcmp (arg
, "-version"))
4392 print_version (stderr
, "");
4393 exit_after_options
= 1;
4396 /* Handle '--param <name>=<value>'. */
4397 if (strcmp (arg
, "-param") == 0)
4403 error ("-param option missing argument");
4407 /* Get the '<name>=<value' parameter. */
4409 /* Look for the `='. */
4410 equal
= strchr (arg
, '=');
4412 error ("invalid --param option: %s", arg
);
4417 /* Zero out the `=' sign so that we get two separate strings. */
4419 /* Figure out what value is specified. */
4420 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4421 if (val
!= INVALID_PARAM_VAL
)
4422 set_param_value (arg
, val
);
4424 error ("invalid parameter value `%s'", equal
+ 1);
4439 /* Already been treated in main (). Do nothing. */
4443 set_target_switch (arg
+ 1);
4447 return decode_f_option (arg
+ 1);
4450 return decode_g_option (arg
+ 1);
4453 if (!strcmp (arg
, "dumpbase"))
4458 dump_base_name
= argv
[1];
4462 decode_d_option (arg
+ 1);
4466 if (!strcmp (arg
, "pedantic"))
4468 else if (!strcmp (arg
, "pedantic-errors"))
4469 flag_pedantic_errors
= pedantic
= 1;
4470 else if (arg
[1] == 0)
4477 if (!strcmp (arg
, "quiet"))
4484 if (!strcmp (arg
, "version"))
4492 inhibit_warnings
= 1;
4501 /* We save the value of warn_uninitialized, since if they put
4502 -Wuninitialized on the command line, we need to generate a
4503 warning about not using it without also specifying -O. */
4504 if (warn_uninitialized
!= 1)
4505 warn_uninitialized
= 2;
4508 return decode_W_option (arg
+ 1);
4514 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4515 warning ("`-a' option (basic block profile) not supported");
4517 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4520 else if (!strcmp (arg
, "ax"))
4522 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4523 warning ("`-ax' option (jump profiling) not supported");
4525 profile_block_flag
= (!profile_block_flag
4526 || profile_block_flag
== 2) ? 2 : 3;
4529 else if (!strncmp (arg
, "aux-info", 8))
4531 flag_gen_aux_info
= 1;
4537 aux_info_file_name
= argv
[1];
4541 aux_info_file_name
= arg
+ 8;
4553 asm_file_name
= argv
[1];
4568 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4573 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4577 if (g_switch_val
== -1)
4581 g_switch_set
= TRUE
;
4582 g_switch_value
= g_switch_val
;
4592 /* Entry point of cc1/c++. Decode command args, then call compile_file.
4593 Exit code is 35 if can't open files, 34 if fatal error,
4594 33 if had nonfatal errors, else success. */
4596 extern int main
PARAMS ((int, char **));
4606 /* save in case md file wants to emit args as a comment. */
4610 p
= argv
[0] + strlen (argv
[0]);
4611 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4615 xmalloc_set_program_name (progname
);
4617 /* LC_CTYPE determines the character set used by the terminal so it has be set
4618 to output messages correctly. */
4620 #ifdef HAVE_LC_MESSAGES
4621 setlocale (LC_CTYPE
, "");
4622 setlocale (LC_MESSAGES
, "");
4624 setlocale (LC_ALL
, "");
4627 (void) bindtextdomain (PACKAGE
, localedir
);
4628 (void) textdomain (PACKAGE
);
4630 /* Install handler for SIGFPE, which may be received while we do
4631 compile-time floating point arithmetic. */
4632 signal (SIGFPE
, float_signal
);
4634 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4636 signal (SIGSEGV
, crash_signal
);
4639 signal (SIGILL
, crash_signal
);
4642 signal (SIGBUS
, crash_signal
);
4645 signal (SIGABRT
, crash_signal
);
4647 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4648 signal (SIGIOT
, crash_signal
);
4651 decl_printable_name
= decl_name
;
4652 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4654 /* Initialize whether `char' is signed. */
4655 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4656 #ifdef DEFAULT_SHORT_ENUMS
4657 /* Initialize how much space enums occupy, by default. */
4658 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4661 /* Initialize the garbage-collector. */
4664 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4665 ggc_add_tree_root (¤t_function_decl
, 1);
4666 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4668 /* Initialize the diagnostics reporting machinery. */
4669 initialize_diagnostics ();
4671 /* Register the language-independent parameters. */
4672 add_params (lang_independent_params
, LAST_PARAM
);
4674 /* Perform language-specific options intialization. */
4675 if (lang_hooks
.init_options
)
4676 (*lang_hooks
.init_options
) ();
4678 /* Scan to see what optimization level has been specified. That will
4679 determine the default value of many flags. */
4680 for (i
= 1; i
< argc
; i
++)
4682 if (!strcmp (argv
[i
], "-O"))
4687 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4689 /* Handle -Os, -O2, -O3, -O69, ... */
4690 char *p
= &argv
[i
][2];
4692 if ((p
[0] == 's') && (p
[1] == 0))
4696 /* Optimizing for size forces optimize to be 2. */
4701 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4702 if (optimize_val
!= -1)
4704 optimize
= optimize_val
;
4714 flag_thread_jumps
= 1;
4716 flag_delayed_branch
= 1;
4718 #ifdef CAN_DEBUG_WITHOUT_FP
4719 flag_omit_frame_pointer
= 1;
4721 flag_guess_branch_prob
= 1;
4726 flag_optimize_sibling_calls
= 1;
4727 flag_cse_follow_jumps
= 1;
4728 flag_cse_skip_blocks
= 1;
4730 flag_expensive_optimizations
= 1;
4731 flag_strength_reduce
= 1;
4732 flag_rerun_cse_after_loop
= 1;
4733 flag_rerun_loop_opt
= 1;
4734 flag_caller_saves
= 1;
4737 #ifdef INSN_SCHEDULING
4738 flag_schedule_insns
= 1;
4739 flag_schedule_insns_after_reload
= 1;
4742 flag_strict_aliasing
= 1;
4743 flag_delete_null_pointer_checks
= 1;
4744 flag_reorder_blocks
= 1;
4749 flag_inline_functions
= 1;
4750 flag_rename_registers
= 1;
4753 if (optimize
< 2 || optimize_size
)
4758 align_functions
= 1;
4761 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4764 set_target_switch ("");
4766 /* Unwind tables are always present in an ABI-conformant IA-64
4767 object file, so the default should be ON. */
4768 #ifdef IA64_UNWIND_INFO
4769 flag_unwind_tables
= IA64_UNWIND_INFO
;
4772 #ifdef OPTIMIZATION_OPTIONS
4773 /* Allow default optimizations to be specified on a per-machine basis. */
4774 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4777 /* Initialize register usage now so switches may override. */
4780 /* Perform normal command line switch decoding. */
4781 for (i
= 1; i
< argc
;)
4783 unsigned int lang_processed
;
4784 unsigned int indep_processed
;
4786 /* Give the language a chance to decode the option for itself. */
4787 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4789 /* Now see if the option also has a language independent meaning.
4790 Some options are both language specific and language independent,
4792 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4794 if (lang_processed
|| indep_processed
)
4795 i
+= MAX (lang_processed
, indep_processed
);
4798 const char *option
= NULL
;
4799 const char *lang
= NULL
;
4802 /* It is possible that the command line switch is not valid for the
4803 current language, but it is valid for another language. In order
4804 to be compatible with previous versions of the compiler (which
4805 did not issue an error message in this case) we check for this
4806 possibility here. If we do find a match, then if extra_warnings
4807 is set we generate a warning message, otherwise we will just
4808 ignore the option. */
4809 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4811 option
= documented_lang_options
[j
].option
;
4814 lang
= documented_lang_options
[j
].description
;
4815 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4819 if (j
!= ARRAY_SIZE (documented_lang_options
))
4823 warning ("Ignoring command line option '%s'", argv
[i
]);
4826 ("(It is valid for %s but not the selected language)",
4830 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4831 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4833 error ("Unrecognized option `%s'", argv
[i
]);
4839 /* All command line options have been processed. */
4840 if (lang_hooks
.post_options
)
4841 (*lang_hooks
.post_options
) ();
4843 if (exit_after_options
)
4846 /* Reflect any language-specific diagnostic option setting. */
4847 reshape_diagnostic_buffer ();
4849 /* Checker uses the frame pointer. */
4850 if (flag_check_memory_usage
)
4851 flag_omit_frame_pointer
= 0;
4855 /* Inlining does not work if not optimizing,
4856 so force it not to be done. */
4860 /* The c_decode_option function and decode_option hook set
4861 this to `2' if -Wall is used, so we can avoid giving out
4862 lots of errors for people who don't realize what -Wall does. */
4863 if (warn_uninitialized
== 1)
4864 warning ("-Wuninitialized is not supported without -O");
4867 #ifdef OVERRIDE_OPTIONS
4868 /* Some machines may reject certain combinations of options. */
4872 if (exceptions_via_longjmp
== 2)
4874 #ifdef DWARF2_UNWIND_INFO
4875 exceptions_via_longjmp
= ! DWARF2_UNWIND_INFO
;
4877 #ifdef IA64_UNWIND_INFO
4878 exceptions_via_longjmp
= ! IA64_UNWIND_INFO
;
4880 exceptions_via_longjmp
= 1;
4885 /* Since each function gets its own handler data, we can't support the
4886 new model currently, since it depend on a specific rethrow label
4887 which is declared at the front of the table, and we can only
4888 have one such symbol in a file. */
4889 #ifdef IA64_UNWIND_INFO
4890 flag_new_exceptions
= 0;
4893 /* Set up the align_*_log variables, defaulting them to 1 if they
4894 were still unset. */
4895 if (align_loops
<= 0) align_loops
= 1;
4896 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4897 if (align_jumps
<= 0) align_jumps
= 1;
4898 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4899 if (align_labels
<= 0) align_labels
= 1;
4900 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4901 if (align_functions
<= 0) align_functions
= 1;
4902 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4904 if (profile_block_flag
== 3)
4906 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4907 profile_block_flag
= 2;
4910 /* Unrolling all loops implies that standard loop unrolling must also
4912 if (flag_unroll_all_loops
)
4913 flag_unroll_loops
= 1;
4914 /* Loop unrolling requires that strength_reduction be on also. Silently
4915 turn on strength reduction here if it isn't already on. Also, the loop
4916 unrolling code assumes that cse will be run after loop, so that must
4917 be turned on also. */
4918 if (flag_unroll_loops
)
4920 flag_strength_reduce
= 1;
4921 flag_rerun_cse_after_loop
= 1;
4924 /* Warn about options that are not supported on this machine. */
4925 #ifndef INSN_SCHEDULING
4926 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4927 warning ("instruction scheduling not supported on this target machine");
4930 if (flag_delayed_branch
)
4931 warning ("this target machine does not have delayed branches");
4934 user_label_prefix
= USER_LABEL_PREFIX
;
4935 if (flag_leading_underscore
!= -1)
4937 /* If the default prefix is more complicated than "" or "_",
4938 issue a warning and ignore this option. */
4939 if (user_label_prefix
[0] == 0 ||
4940 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4942 user_label_prefix
= flag_leading_underscore
? "_" : "";
4945 warning ("-f%sleading-underscore not supported on this target machine",
4946 flag_leading_underscore
? "" : "no-");
4949 /* If we are in verbose mode, write out the version and maybe all the
4950 option flags in use. */
4953 print_version (stderr
, "");
4955 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4958 compile_file (filename
);
4960 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4963 char *lim
= (char *) sbrk (0);
4965 fnotice (stderr
, "Data size %ld.\n", (long) (lim
- (char *) &environ
));
4970 system ("ps -l 1>&2");
4973 #endif /* not USG */
4976 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4979 return (FATAL_EXIT_CODE
);
4981 return (FATAL_EXIT_CODE
);
4982 return (SUCCESS_EXIT_CODE
);
4985 /* Decode -m switches. */
4986 /* Decode the switch -mNAME. */
4989 set_target_switch (name
)
4993 int valid_target_option
= 0;
4995 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4996 if (!strcmp (target_switches
[j
].name
, name
))
4998 if (target_switches
[j
].value
< 0)
4999 target_flags
&= ~-target_switches
[j
].value
;
5001 target_flags
|= target_switches
[j
].value
;
5002 valid_target_option
= 1;
5005 #ifdef TARGET_OPTIONS
5006 if (!valid_target_option
)
5007 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5009 int len
= strlen (target_options
[j
].prefix
);
5010 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5012 *target_options
[j
].variable
= name
+ len
;
5013 valid_target_option
= 1;
5018 if (!valid_target_option
)
5019 error ("Invalid option `%s'", name
);
5022 /* Print version information to FILE.
5023 Each line begins with INDENT (for the case where FILE is the
5024 assembler output file). */
5027 print_version (file
, indent
)
5032 #define __VERSION__ "[?]"
5036 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5038 "%s%s%s version %s (%s) compiled by CC.\n"
5040 , indent
, *indent
!= 0 ? " " : "",
5041 language_string
, version_string
, TARGET_NAME
,
5042 indent
, __VERSION__
);
5045 /* Print an option value and return the adjusted position in the line.
5046 ??? We don't handle error returns from fprintf (disk full); presumably
5047 other code will catch a disk full though. */
5050 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5053 const char *indent
, *sep
, *term
, *type
, *name
;
5055 /* The ultrix fprintf returns 0 on success, so compute the result we want
5056 here since we need it for the following test. */
5057 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5062 fprintf (file
, "%s", term
);
5067 fprintf (file
, "%s", indent
);
5068 pos
= strlen (indent
);
5070 fprintf (file
, "%s%s%s", sep
, type
, name
);
5075 /* Print active target switches to FILE.
5076 POS is the current cursor position and MAX is the size of a "line".
5077 Each line begins with INDENT and ends with TERM.
5078 Each switch is separated from the next by SEP. */
5081 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5084 const char *indent
, *sep
, *term
;
5089 /* Print the options as passed. */
5091 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5092 _("options passed: "), "");
5094 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5098 if (strcmp (*p
, "-o") == 0)
5104 if (strcmp (*p
, "-quiet") == 0)
5106 if (strcmp (*p
, "-version") == 0)
5111 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5114 fprintf (file
, "%s", term
);
5116 /* Print the -f and -m options that have been enabled.
5117 We don't handle language specific options but printing argv
5120 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5121 _("options enabled: "), "");
5123 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5124 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5125 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5126 "-f", f_options
[j
].string
);
5128 /* Print target specific options. */
5130 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5131 if (target_switches
[j
].name
[0] != '\0'
5132 && target_switches
[j
].value
> 0
5133 && ((target_switches
[j
].value
& target_flags
)
5134 == target_switches
[j
].value
))
5136 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5137 "-m", target_switches
[j
].name
);
5140 #ifdef TARGET_OPTIONS
5141 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5142 if (*target_options
[j
].variable
!= NULL
)
5145 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5146 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5147 prefix
, *target_options
[j
].variable
);
5151 fprintf (file
, "%s", term
);
5154 /* Record the beginning of a new source file, named FILENAME. */
5157 debug_start_source_file (filename
)
5158 register const char *filename ATTRIBUTE_UNUSED
;
5160 #ifdef DBX_DEBUGGING_INFO
5161 if (write_symbols
== DBX_DEBUG
)
5162 dbxout_start_new_source_file (filename
);
5164 #ifdef DWARF_DEBUGGING_INFO
5165 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5166 && write_symbols
== DWARF_DEBUG
)
5167 dwarfout_start_new_source_file (filename
);
5168 #endif /* DWARF_DEBUGGING_INFO */
5169 #ifdef DWARF2_DEBUGGING_INFO
5170 if (write_symbols
== DWARF2_DEBUG
)
5171 dwarf2out_start_source_file (filename
);
5172 #endif /* DWARF2_DEBUGGING_INFO */
5173 #ifdef SDB_DEBUGGING_INFO
5174 if (write_symbols
== SDB_DEBUG
)
5175 sdbout_start_new_source_file (filename
);
5179 /* Record the resumption of a source file. LINENO is the line number in
5180 the source file we are returning to. */
5183 debug_end_source_file (lineno
)
5184 register unsigned lineno ATTRIBUTE_UNUSED
;
5186 #ifdef DBX_DEBUGGING_INFO
5187 if (write_symbols
== DBX_DEBUG
)
5188 dbxout_resume_previous_source_file ();
5190 #ifdef DWARF_DEBUGGING_INFO
5191 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5192 && write_symbols
== DWARF_DEBUG
)
5193 dwarfout_resume_previous_source_file (lineno
);
5194 #endif /* DWARF_DEBUGGING_INFO */
5195 #ifdef DWARF2_DEBUGGING_INFO
5196 if (write_symbols
== DWARF2_DEBUG
)
5197 dwarf2out_end_source_file ();
5198 #endif /* DWARF2_DEBUGGING_INFO */
5199 #ifdef SDB_DEBUGGING_INFO
5200 if (write_symbols
== SDB_DEBUG
)
5201 sdbout_resume_previous_source_file ();
5205 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5206 the tail part of the directive line, i.e. the part which is past the
5207 initial whitespace, #, whitespace, directive-name, whitespace part. */
5210 debug_define (lineno
, buffer
)
5211 register unsigned lineno ATTRIBUTE_UNUSED
;
5212 register const char *buffer ATTRIBUTE_UNUSED
;
5214 #ifdef DWARF_DEBUGGING_INFO
5215 if (write_symbols
== DWARF_DEBUG
)
5216 dwarfout_define (lineno
, buffer
);
5217 #endif /* DWARF_DEBUGGING_INFO */
5218 #ifdef DWARF2_DEBUGGING_INFO
5219 if (write_symbols
== DWARF2_DEBUG
)
5220 dwarf2out_define (lineno
, buffer
);
5221 #endif /* DWARF2_DEBUGGING_INFO */
5224 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5225 the tail part of the directive line, i.e. the part which is past the
5226 initial whitespace, #, whitespace, directive-name, whitespace part. */
5229 debug_undef (lineno
, buffer
)
5230 register unsigned lineno ATTRIBUTE_UNUSED
;
5231 register const char *buffer ATTRIBUTE_UNUSED
;
5233 #ifdef DWARF_DEBUGGING_INFO
5234 if (write_symbols
== DWARF_DEBUG
)
5235 dwarfout_undef (lineno
, buffer
);
5236 #endif /* DWARF_DEBUGGING_INFO */
5237 #ifdef DWARF2_DEBUGGING_INFO
5238 if (write_symbols
== DWARF2_DEBUG
)
5239 dwarf2out_undef (lineno
, buffer
);
5240 #endif /* DWARF2_DEBUGGING_INFO */
5243 /* Returns nonzero if it is appropriate not to emit any debugging
5244 information for BLOCK, because it doesn't contain any instructions.
5245 This may not be the case for blocks containing nested functions, since
5246 we may actually call such a function even though the BLOCK information
5250 debug_ignore_block (block
)
5251 tree block ATTRIBUTE_UNUSED
;
5253 /* Never delete the BLOCK for the outermost scope
5254 of the function; we can refer to names from
5255 that scope even if the block notes are messed up. */
5256 if (is_body_block (block
))
5259 #ifdef DWARF2_DEBUGGING_INFO
5260 if (write_symbols
== DWARF2_DEBUG
)
5261 return dwarf2out_ignore_block (block
);