1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.h"
49 #include "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #ifdef DWARF_DEBUGGING_INFO
71 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
72 #include "dwarf2out.h"
75 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
79 #ifdef SDB_DEBUGGING_INFO
83 #ifdef XCOFF_DEBUGGING_INFO
88 /* The extra parameters substantially improve the I/O performance. */
91 vms_fopen (fname
, type
)
95 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
96 fixed arguments, which matches ANSI's specification but not VAXCRTL's
97 pre-ANSI implementation. This hack circumvents the mismatch problem. */
98 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
101 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
102 "deq=64", "fop=tef", "shr=nil");
104 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
107 #define fopen vms_fopen
110 #ifndef DEFAULT_GDB_EXTENSIONS
111 #define DEFAULT_GDB_EXTENSIONS 1
114 /* If more than one debugging type is supported, you must define
115 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
117 This is one long line cause VAXC can't handle a \-newline. */
118 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
119 #ifndef PREFERRED_DEBUGGING_TYPE
120 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
121 #endif /* no PREFERRED_DEBUGGING_TYPE */
122 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
123 so the following code needn't care. */
124 #ifdef DBX_DEBUGGING_INFO
125 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
127 #ifdef SDB_DEBUGGING_INFO
128 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
130 #ifdef DWARF_DEBUGGING_INFO
131 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
133 #ifdef DWARF2_DEBUGGING_INFO
134 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
136 #ifdef XCOFF_DEBUGGING_INFO
137 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
139 #endif /* More than one debugger format enabled. */
141 /* If still not defined, must have been because no debugging formats
143 #ifndef PREFERRED_DEBUGGING_TYPE
144 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
147 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
148 extern char **environ
;
151 /* Carry information from ASM_DECLARE_OBJECT_NAME
152 to ASM_FINISH_DECLARE_OBJECT. */
154 extern int size_directive_output
;
155 extern tree last_assemble_variable_decl
;
157 static void set_target_switch
PARAMS ((const char *));
158 static const char *decl_name
PARAMS ((tree
, int));
160 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
161 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
162 #ifdef ASM_IDENTIFY_LANGUAGE
163 /* This might or might not be used in ASM_IDENTIFY_LANGUAGE. */
164 static void output_lang_identify
PARAMS ((FILE *)) ATTRIBUTE_UNUSED
;
166 static void compile_file
PARAMS ((const char *));
167 static void display_help
PARAMS ((void));
168 static void display_target_options
PARAMS ((void));
170 static void decode_d_option
PARAMS ((const char *));
171 static int decode_f_option
PARAMS ((const char *));
172 static int decode_W_option
PARAMS ((const char *));
173 static int decode_g_option
PARAMS ((const char *));
174 static unsigned int independent_decode_option
PARAMS ((int, char **));
176 static void print_version
PARAMS ((FILE *, const char *));
177 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
178 const char *, const char *,
179 const char *, const char *));
180 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
181 const char *, const char *));
183 /* Length of line when printing switch values. */
186 /* Name of program invoked, sans directories. */
188 const char *progname
;
190 /* Copy of arguments to toplev_main. */
194 /* Name of current original source file (what was input to cpp).
195 This comes from each #-command in the actual input. */
197 const char *input_filename
;
199 /* Name of top-level original source file (what was input to cpp).
200 This comes from the #-command at the beginning of the actual input.
201 If there isn't any there, then this is the cc1 input file name. */
203 const char *main_input_filename
;
205 /* Current line number in real source file. */
209 /* Nonzero if it is unsafe to create any new pseudo registers. */
212 /* Stack of currently pending input files. */
214 struct file_stack
*input_file_stack
;
216 /* Incremented on each change to input_file_stack. */
217 int input_file_stack_tick
;
219 /* Name to use as base of names for dump output files. */
221 const char *dump_base_name
;
223 /* Bit flags that specify the machine subtype we are compiling for.
224 Bits are tested using macros TARGET_... defined in the tm.h file
225 and set by `-m...' switches. Must be defined in rtlanal.c. */
227 extern int target_flags
;
229 /* Describes a dump file. */
231 struct dump_file_info
233 /* The unique extension to apply, e.g. ".jump". */
234 const char *const extension
;
236 /* The -d<c> character that enables this dump file. */
237 char const debug_switch
;
239 /* True if there is a corresponding graph dump file. */
240 char const graph_dump_p
;
242 /* True if the user selected this dump. */
245 /* True if the files have been initialized (ie truncated). */
249 /* Enumerate the extant dump files. */
287 /* Describes all the dump files. Should be kept in order of the
288 pass and in sync with dump_file_index above.
290 Remaining -d letters:
296 struct dump_file_info dump_file
[DFI_MAX
] =
298 { "rtl", 'r', 0, 0, 0 },
299 { "sibling", 'i', 0, 0, 0 },
300 { "jump", 'j', 0, 0, 0 },
301 { "cse", 's', 0, 0, 0 },
302 { "addressof", 'F', 0, 0, 0 },
303 { "ssa", 'e', 1, 0, 0 },
304 { "dce", 'X', 1, 0, 0 },
305 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
306 { "gcse", 'G', 1, 0, 0 },
307 { "loop", 'L', 1, 0, 0 },
308 { "cse2", 't', 1, 0, 0 },
309 { "cfg", 'f', 1, 0, 0 },
310 { "bp", 'b', 1, 0, 0 },
311 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "combine", 'c', 1, 0, 0 },
313 { "ce", 'C', 1, 0, 0 },
314 { "regmove", 'N', 1, 0, 0 },
315 { "sched", 'S', 1, 0, 0 },
316 { "lreg", 'l', 1, 0, 0 },
317 { "greg", 'g', 1, 0, 0 },
318 { "postreload", 'o', 1, 0, 0 },
319 { "flow2", 'w', 1, 0, 0 },
320 { "peephole2", 'z', 1, 0, 0 },
321 { "rnreg", 'n', 1, 0, 0 },
322 { "ce2", 'E', 1, 0, 0 },
323 { "sched2", 'R', 1, 0, 0 },
324 { "bbro", 'B', 1, 0, 0 },
325 { "jump2", 'J', 1, 0, 0 },
326 { "mach", 'M', 1, 0, 0 },
327 { "dbr", 'd', 0, 0, 0 },
328 { "stack", 'k', 1, 0, 0 },
331 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
332 static void close_dump_file
PARAMS ((enum dump_file_index
,
333 void (*) (FILE *, rtx
), rtx
));
335 /* Other flags saying which kinds of debugging dump have been requested. */
337 int rtl_dump_and_exit
;
338 int flag_print_asm_name
;
339 static int flag_print_mem
;
340 static int version_flag
;
341 static char *filename
;
342 enum graph_dump_types graph_dump_format
;
344 /* Name for output file of assembly code, specified with -o. */
348 /* Value of the -G xx switch, and whether it was passed or not. */
352 /* Type(s) of debugging information we are producing (if any).
353 See flags.h for the definitions of the different possible
354 types of debugging information. */
355 enum debug_info_type write_symbols
= NO_DEBUG
;
357 /* Level of debugging information we are producing. See flags.h
358 for the definitions of the different possible levels. */
359 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
361 /* Nonzero means use GNU-only extensions in the generated symbolic
362 debugging information. */
363 /* Currently, this only has an effect when write_symbols is set to
364 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
365 int use_gnu_debug_info_extensions
= 0;
367 /* Nonzero means do optimizations. -O.
368 Particular numeric values stand for particular amounts of optimization;
369 thus, -O2 stores 2 here. However, the optimizations beyond the basic
370 ones are not controlled directly by this variable. Instead, they are
371 controlled by individual `flag_...' variables that are defaulted
372 based on this variable. */
376 /* Nonzero means optimize for size. -Os.
377 The only valid values are zero and non-zero. When optimize_size is
378 non-zero, optimize defaults to 2, but certain individual code
379 bloating optimizations are disabled. */
381 int optimize_size
= 0;
383 /* Number of error messages and warning messages so far. */
386 int warningcount
= 0;
389 /* Nonzero if we should exit after parsing options. */
390 static int exit_after_options
= 0;
392 /* The FUNCTION_DECL for the function currently being compiled,
393 or 0 if between functions. */
394 tree current_function_decl
;
396 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
398 tree current_function_func_begin_label
;
400 /* Pointer to function to compute the name to use to print a declaration.
401 DECL is the declaration in question.
402 VERBOSITY determines what information will be printed:
403 0: DECL_NAME, demangled as necessary.
404 1: and scope information.
405 2: and any other information that might be interesting, such as function
406 parameter types in C++. */
408 const char *(*decl_printable_name
) PARAMS ((tree
, int));
410 /* Pointer to function to compute rtl for a language-specific tree code. */
412 typedef rtx (*lang_expand_expr_t
)
413 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
414 enum expand_modifier modifier
));
416 lang_expand_expr_t lang_expand_expr
= 0;
418 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
420 /* Pointer to function to finish handling an incomplete decl at the
421 end of compilation. */
423 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
425 /* Nonzero if doing dwarf2 duplicate elimination. */
427 int flag_eliminate_dwarf2_dups
= 0;
429 /* Nonzero if generating code to do profiling. */
431 int profile_flag
= 0;
433 /* Nonzero if generating code to do profiling on a line-by-line basis. */
435 int profile_block_flag
;
437 /* Nonzero if generating code to profile program flow graph arcs. */
439 int profile_arc_flag
= 0;
441 /* Nonzero if generating info for gcov to calculate line test coverage. */
443 int flag_test_coverage
= 0;
445 /* Nonzero indicates that branch taken probabilities should be calculated. */
447 int flag_branch_probabilities
= 0;
449 /* Nonzero if basic blocks should be reordered. */
451 int flag_reorder_blocks
= 0;
453 /* Nonzero if registers should be renamed. */
455 int flag_rename_registers
= 0;
457 /* Nonzero for -pedantic switch: warn about anything
458 that standard spec forbids. */
462 /* Temporarily suppress certain warnings.
463 This is set while reading code from a system header file. */
465 int in_system_header
= 0;
467 /* Don't print functions as they are compiled. -quiet. */
471 /* Print times taken by the various passes. -ftime-report. */
475 /* Print memory still in use at end of compilation (which may have little
476 to do with peak memory consumption). -fmem-report. */
480 /* Non-zero means to collect statistics which might be expensive
481 and to print them when we are done. */
482 int flag_detailed_statistics
= 0;
487 /* Nonzero means `char' should be signed. */
489 int flag_signed_char
;
491 /* Nonzero means give an enum type only as many bytes as it needs. */
493 int flag_short_enums
;
495 /* Nonzero for -fcaller-saves: allocate values in regs that need to
496 be saved across function calls, if that produces overall better code.
497 Optional now, so people can test it. */
499 #ifdef DEFAULT_CALLER_SAVES
500 int flag_caller_saves
= 1;
502 int flag_caller_saves
= 0;
505 /* Nonzero if structures and unions should be returned in memory.
507 This should only be defined if compatibility with another compiler or
508 with an ABI is needed, because it results in slower code. */
510 #ifndef DEFAULT_PCC_STRUCT_RETURN
511 #define DEFAULT_PCC_STRUCT_RETURN 1
514 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
516 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
518 /* Nonzero for -fforce-mem: load memory value into a register
519 before arithmetic on it. This makes better cse but slower compilation. */
521 int flag_force_mem
= 0;
523 /* Nonzero for -fforce-addr: load memory address into a register before
524 reference to memory. This makes better cse but slower compilation. */
526 int flag_force_addr
= 0;
528 /* Nonzero for -fdefer-pop: don't pop args after each function call;
529 instead save them up to pop many calls' args with one insns. */
531 int flag_defer_pop
= 0;
533 /* Nonzero for -ffloat-store: don't allocate floats and doubles
534 in extended-precision registers. */
536 int flag_float_store
= 0;
538 /* Nonzero for -fcse-follow-jumps:
539 have cse follow jumps to do a more extensive job. */
541 int flag_cse_follow_jumps
;
543 /* Nonzero for -fcse-skip-blocks:
544 have cse follow a branch around a block. */
545 int flag_cse_skip_blocks
;
547 /* Nonzero for -fexpensive-optimizations:
548 perform miscellaneous relatively-expensive optimizations. */
549 int flag_expensive_optimizations
;
551 /* Nonzero for -fthread-jumps:
552 have jump optimize output of loop. */
554 int flag_thread_jumps
;
556 /* Nonzero enables strength-reduction in loop.c. */
558 int flag_strength_reduce
= 0;
560 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
561 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
562 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
565 int flag_unroll_loops
;
567 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
568 This is generally not a win. */
570 int flag_unroll_all_loops
;
572 /* Nonzero forces all invariant computations in loops to be moved
575 int flag_move_all_movables
= 0;
577 /* Nonzero forces all general induction variables in loops to be
580 int flag_reduce_all_givs
= 0;
582 /* Nonzero to perform full register move optimization passes. This is the
585 int flag_regmove
= 0;
587 /* Nonzero for -fwritable-strings:
588 store string constants in data segment and don't uniquize them. */
590 int flag_writable_strings
= 0;
592 /* Nonzero means don't put addresses of constant functions in registers.
593 Used for compiling the Unix kernel, where strange substitutions are
594 done on the assembly output. */
596 int flag_no_function_cse
= 0;
598 /* Nonzero for -fomit-frame-pointer:
599 don't make a frame pointer in simple functions that don't require one. */
601 int flag_omit_frame_pointer
= 0;
603 /* Nonzero means place each function into its own section on those platforms
604 which support arbitrary section names and unlimited numbers of sections. */
606 int flag_function_sections
= 0;
608 /* ... and similar for data. */
610 int flag_data_sections
= 0;
612 /* Nonzero to inhibit use of define_optimization peephole opts. */
614 int flag_no_peephole
= 0;
616 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
618 int flag_optimize_sibling_calls
= 0;
620 /* Nonzero means the front end generally wants `errno' maintained by math
621 operations, like built-in SQRT. */
623 int flag_errno_math
= 1;
625 /* Nonzero means that unsafe floating-point math optimizations are allowed
626 for the sake of speed. IEEE compliance is not guaranteed, and operations
627 are allowed to assume that their arguments and results are "normal"
628 (e.g., nonnegative for SQRT). */
630 int flag_unsafe_math_optimizations
= 0;
632 /* Zero means that floating-point math operations cannot generate a
633 (user-visible) trap. This is the case, for example, in nonstop
634 IEEE 754 arithmetic. */
636 int flag_trapping_math
= 1;
638 /* 0 means straightforward implementation of complex divide acceptable.
639 1 means wide ranges of inputs must work for complex divide.
640 2 means C99-like requirements for complex divide (not yet implemented). */
642 int flag_complex_divide_method
= 0;
644 /* Nonzero means all references through pointers are volatile. */
648 /* Nonzero means treat all global and extern variables as volatile. */
650 int flag_volatile_global
;
652 /* Nonzero means treat all static variables as volatile. */
654 int flag_volatile_static
;
656 /* Nonzero means just do syntax checking; don't output anything. */
658 int flag_syntax_only
= 0;
660 /* Nonzero means perform global cse. */
662 static int flag_gcse
;
664 /* Nonzero means to use global dataflow analysis to eliminate
665 useless null pointer tests. */
667 static int flag_delete_null_pointer_checks
;
669 /* Nonzero means to rerun cse after loop optimization. This increases
670 compilation time about 20% and picks up a few more common expressions. */
672 static int flag_rerun_cse_after_loop
;
674 /* Nonzero means to run loop optimizations twice. */
676 int flag_rerun_loop_opt
;
678 /* Nonzero for -finline-functions: ok to inline functions that look like
679 good inline candidates. */
681 int flag_inline_functions
;
683 /* Nonzero for -fkeep-inline-functions: even if we make a function
684 go inline everywhere, keep its definition around for debugging
687 int flag_keep_inline_functions
;
689 /* Nonzero means that functions will not be inlined. */
693 /* Nonzero means that we should emit static const variables
694 regardless of whether or not optimization is turned on. */
696 int flag_keep_static_consts
= 1;
698 /* Nonzero means we should be saving declaration info into a .X file. */
700 int flag_gen_aux_info
= 0;
702 /* Specified name of aux-info file. */
704 static char *aux_info_file_name
;
706 /* Nonzero means make the text shared if supported. */
708 int flag_shared_data
;
710 /* Nonzero means schedule into delayed branch slots if supported. */
712 int flag_delayed_branch
;
714 /* Nonzero if we are compiling pure (sharable) code.
715 Value is 1 if we are doing reasonable (i.e. simple
716 offset into offset table) pic. Value is 2 if we can
717 only perform register offsets. */
721 /* Nonzero means generate extra code for exception handling and enable
722 exception handling. */
726 /* Nonzero means use the new model for exception handling. Replaces
727 -DNEW_EH_MODEL as a compile option. */
729 int flag_new_exceptions
= 1;
731 /* Nonzero means generate frame unwind info table when supported. */
733 int flag_unwind_tables
= 0;
735 /* Nonzero means don't place uninitialized global data in common storage
740 /* Nonzero means pretend it is OK to examine bits of target floats,
741 even if that isn't true. The resulting code will have incorrect constants,
742 but the same series of instructions that the native compiler would make. */
744 int flag_pretend_float
;
746 /* Nonzero means change certain warnings into errors.
747 Usually these are warnings about failure to conform to some standard. */
749 int flag_pedantic_errors
= 0;
751 /* flag_schedule_insns means schedule insns within basic blocks (before
753 flag_schedule_insns_after_reload means schedule insns after
756 int flag_schedule_insns
= 0;
757 int flag_schedule_insns_after_reload
= 0;
759 /* The following flags have effect only for scheduling before register
762 flag_schedule_interblock means schedule insns accross basic blocks.
763 flag_schedule_speculative means allow speculative motion of non-load insns.
764 flag_schedule_speculative_load means allow speculative motion of some
766 flag_schedule_speculative_load_dangerous allows speculative motion of more
769 int flag_schedule_interblock
= 1;
770 int flag_schedule_speculative
= 1;
771 int flag_schedule_speculative_load
= 0;
772 int flag_schedule_speculative_load_dangerous
= 0;
774 int flag_single_precision_constant
;
776 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
777 by a cheaper branch on a count register. */
778 int flag_branch_on_count_reg
= 1;
780 /* -finhibit-size-directive inhibits output of .size for ELF.
781 This is used only for compiling crtstuff.c,
782 and it may be extended to other effects
783 needed for crtstuff.c on other systems. */
784 int flag_inhibit_size_directive
= 0;
786 /* -fverbose-asm causes extra commentary information to be produced in
787 the generated assembly code (to make it more readable). This option
788 is generally only of use to those who actually need to read the
789 generated assembly code (perhaps while debugging the compiler itself).
790 -fno-verbose-asm, the default, causes the extra information
791 to be omitted and is useful when comparing two assembler files. */
793 int flag_verbose_asm
= 0;
795 /* -dA causes debug commentary information to be produced in
796 the generated assembly code (to make it more readable). This option
797 is generally only of use to those who actually need to read the
798 generated assembly code (perhaps while debugging the compiler itself).
799 Currently, this switch is only used by dwarfout.c; however, it is intended
800 to be a catchall for printing debug information in the assembler file. */
802 int flag_debug_asm
= 0;
804 /* -dP causes the rtl to be emitted as a comment in assembly. */
806 int flag_dump_rtl_in_asm
= 0;
808 /* -fgnu-linker specifies use of the GNU linker for initializations.
809 (Or, more generally, a linker that handles initializations.)
810 -fno-gnu-linker says that collect2 will be used. */
812 int flag_gnu_linker
= 0;
814 int flag_gnu_linker
= 1;
820 /* Enable dead code elimination. */
823 /* Tag all structures with __attribute__(packed). */
824 int flag_pack_struct
= 0;
826 /* Emit code to check for stack overflow; also may cause large objects
827 to be allocated dynamically. */
828 int flag_stack_check
;
830 /* When non-NULL, indicates that whenever space is allocated on the
831 stack, the resulting stack pointer must not pass this
832 address---that is, for stacks that grow downward, the stack pointer
833 must always be greater than or equal to this address; for stacks
834 that grow upward, the stack pointer must be less than this address.
835 At present, the rtx may be either a REG or a SYMBOL_REF, although
836 the support provided depends on the backend. */
839 /* -fcheck-memory-usage causes extra code to be generated in order to check
840 memory accesses. This is used by a detector of bad memory accesses such
842 int flag_check_memory_usage
= 0;
844 /* -fprefix-function-name causes function name to be prefixed. This
845 can be used with -fcheck-memory-usage to isolate code compiled with
846 -fcheck-memory-usage. */
847 int flag_prefix_function_name
= 0;
849 /* 0 if pointer arguments may alias each other. True in C.
850 1 if pointer arguments may not alias each other but may alias
852 2 if pointer arguments may not alias each other and may not
853 alias global variables. True in Fortran.
854 This defaults to 0 for C. */
855 int flag_argument_noalias
= 0;
857 /* Nonzero if we should do (language-dependent) alias analysis.
858 Typically, this analysis will assume that expressions of certain
859 types do not alias expressions of certain other types. Only used
860 if alias analysis (in general) is enabled. */
861 int flag_strict_aliasing
= 0;
863 /* Instrument functions with calls at entry and exit, for profiling. */
864 int flag_instrument_function_entry_exit
= 0;
866 /* Nonzero means ignore `#ident' directives. 0 means handle them.
867 On SVR4 targets, it also controls whether or not to emit a
868 string identifying the compiler. */
870 int flag_no_ident
= 0;
872 /* This will perform a peephole pass before sched2. */
873 int flag_peephole2
= 0;
875 /* This will try to guess branch probabilities. */
876 int flag_guess_branch_prob
= 0;
878 /* -fbounded-pointers causes gcc to compile pointers as composite
879 objects occupying three words: the pointer value, the base address
880 of the referent object, and the address immediately beyond the end
881 of the referent object. The base and extent allow us to perform
882 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
883 int flag_bounded_pointers
= 0;
885 /* -fcheck-bounds causes gcc to generate array bounds checks.
886 For C, C++: defaults to value of flag_bounded_pointers.
887 For ObjC: defaults to off.
888 For Java: defaults to on.
889 For Fortran: defaults to off.
890 For CHILL: defaults to off. */
891 int flag_bounds_check
= 0;
893 /* If one, renumber instruction UIDs to reduce the number of
894 unused UIDs if there are a lot of instructions. If greater than
895 one, unconditionally renumber instruction UIDs. */
896 int flag_renumber_insns
= 1;
898 /* Values of the -falign-* flags: how much to align labels in code.
899 0 means `use default', 1 means `don't align'.
900 For each variable, there is an _log variant which is the power
901 of two not less than the variable, for .align output. */
908 int align_labels_log
;
910 int align_functions_log
;
912 /* Table of supported debugging formats. */
916 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
917 constant expression, we use NO_DEBUG in its place. */
918 enum debug_info_type debug_type
;
919 int use_extensions_p
;
920 const char *description
;
924 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
925 "Generate default debug format output" },
926 { "gdb", NO_DEBUG
, 1, "Generate default extended debug format output" },
927 #ifdef DBX_DEBUGGING_INFO
928 { "stabs", DBX_DEBUG
, 0, "Generate STABS format debug output" },
929 { "stabs+", DBX_DEBUG
, 1, "Generate extended STABS format debug output" },
931 #ifdef DWARF_DEBUGGING_INFO
932 { "dwarf", DWARF_DEBUG
, 0, "Generate DWARF-1 format debug output"},
933 { "dwarf+", DWARF_DEBUG
, 1,
934 "Generated extended DWARF-1 format debug output" },
936 #ifdef DWARF2_DEBUGGING_INFO
937 { "dwarf-2", DWARF2_DEBUG
, 0, "Enable DWARF-2 debug output" },
939 #ifdef XCOFF_DEBUGGING_INFO
940 { "xcoff", XCOFF_DEBUG
, 0, "Generate XCOFF format debug output" },
941 { "xcoff+", XCOFF_DEBUG
, 1, "Generate extended XCOFF format debug output" },
943 #ifdef SDB_DEBUGGING_INFO
944 { "coff", SDB_DEBUG
, 0, "Generate COFF format debug output" },
954 const char *description
;
956 lang_independent_options
;
960 /* Add or remove a leading underscore from user symbols. */
961 int flag_leading_underscore
= -1;
963 /* The user symbol prefix after having resolved same. */
964 const char *user_label_prefix
;
966 static const param_info lang_independent_params
[] = {
967 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
969 #include "params.def"
974 /* A default for same. */
975 #ifndef USER_LABEL_PREFIX
976 #define USER_LABEL_PREFIX ""
979 /* Table of language-independent -f options.
980 STRING is the option name. VARIABLE is the address of the variable.
981 ON_VALUE is the value to store in VARIABLE
982 if `-fSTRING' is seen as an option.
983 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
985 lang_independent_options f_options
[] =
987 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
988 "Perform DWARF2 duplicate elimination"},
989 {"float-store", &flag_float_store
, 1,
990 "Do not store floats in registers" },
991 {"volatile", &flag_volatile
, 1,
992 "Consider all mem refs through pointers as volatile"},
993 {"volatile-global", &flag_volatile_global
, 1,
994 "Consider all mem refs to global data to be volatile" },
995 {"volatile-static", &flag_volatile_static
, 1,
996 "Consider all mem refs to static data to be volatile" },
997 {"defer-pop", &flag_defer_pop
, 1,
998 "Defer popping functions args from stack until later" },
999 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1000 "When possible do not generate stack frames"},
1001 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1002 "Optimize sibling and tail recursive calls" },
1003 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1004 "When running CSE, follow jumps to their targets" },
1005 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1006 "When running CSE, follow conditional jumps" },
1007 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1008 "Perform a number of minor, expensive optimisations" },
1009 {"thread-jumps", &flag_thread_jumps
, 1,
1010 "Perform jump threading optimisations"},
1011 {"strength-reduce", &flag_strength_reduce
, 1,
1012 "Perform strength reduction optimisations" },
1013 {"unroll-loops", &flag_unroll_loops
, 1,
1014 "Perform loop unrolling when iteration count is known" },
1015 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1016 "Perform loop unrolling for all loops" },
1017 {"move-all-movables", &flag_move_all_movables
, 1,
1018 "Force all loop invariant computations out of loops" },
1019 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1020 "Strength reduce all loop general induction variables" },
1021 {"writable-strings", &flag_writable_strings
, 1,
1022 "Store strings in writable data section" },
1023 {"peephole", &flag_no_peephole
, 0,
1024 "Enable machine specific peephole optimisations" },
1025 {"force-mem", &flag_force_mem
, 1,
1026 "Copy memory operands into registers before using" },
1027 {"force-addr", &flag_force_addr
, 1,
1028 "Copy memory address constants into regs before using" },
1029 {"function-cse", &flag_no_function_cse
, 0,
1030 "Allow function addresses to be held in registers" },
1031 {"inline-functions", &flag_inline_functions
, 1,
1032 "Integrate simple functions into their callers" },
1033 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1034 "Generate code for funcs even if they are fully inlined" },
1035 {"inline", &flag_no_inline
, 0,
1036 "Pay attention to the 'inline' keyword"},
1037 {"keep-static-consts", &flag_keep_static_consts
, 1,
1038 "Emit static const variables even if they are not used" },
1039 {"syntax-only", &flag_syntax_only
, 1,
1040 "Check for syntax errors, then stop" },
1041 {"shared-data", &flag_shared_data
, 1,
1042 "Mark data as shared rather than private" },
1043 {"caller-saves", &flag_caller_saves
, 1,
1044 "Enable saving registers around function calls" },
1045 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1046 "Return 'short' aggregates in memory, not registers" },
1047 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1048 "Return 'short' aggregates in registers" },
1049 {"delayed-branch", &flag_delayed_branch
, 1,
1050 "Attempt to fill delay slots of branch instructions" },
1051 {"gcse", &flag_gcse
, 1,
1052 "Perform the global common subexpression elimination" },
1053 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1054 "Run CSE pass after loop optimisations"},
1055 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1056 "Run the loop optimiser twice"},
1057 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1058 "Delete useless null pointer checks" },
1059 {"pretend-float", &flag_pretend_float
, 1,
1060 "Pretend that host and target use the same FP format"},
1061 {"schedule-insns", &flag_schedule_insns
, 1,
1062 "Reschedule instructions before register allocation"},
1063 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1064 "Reschedule instructions after register allocation"},
1065 {"sched-interblock",&flag_schedule_interblock
, 1,
1066 "Enable scheduling across basic blocks" },
1067 {"sched-spec",&flag_schedule_speculative
, 1,
1068 "Allow speculative motion of non-loads" },
1069 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1070 "Allow speculative motion of some loads" },
1071 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1072 "Allow speculative motion of more loads" },
1073 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1074 "Replace add,compare,branch with branch on count reg"},
1075 {"pic", &flag_pic
, 1,
1076 "Generate position independent code, if possible"},
1077 {"PIC", &flag_pic
, 2, ""},
1078 {"exceptions", &flag_exceptions
, 1,
1079 "Enable exception handling" },
1080 {"new-exceptions", &flag_new_exceptions
, 1,
1081 "Use the new model for exception handling" },
1082 {"unwind-tables", &flag_unwind_tables
, 1,
1083 "Just generate unwind tables for exception handling" },
1084 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1085 "Support synchronous non-call exceptions" },
1086 {"profile-arcs", &profile_arc_flag
, 1,
1087 "Insert arc based program profiling code" },
1088 {"test-coverage", &flag_test_coverage
, 1,
1089 "Create data files needed by gcov" },
1090 {"branch-probabilities", &flag_branch_probabilities
, 1,
1091 "Use profiling information for branch probabilities" },
1092 {"reorder-blocks", &flag_reorder_blocks
, 1,
1093 "Reorder basic blocks to improve code placement" },
1094 {"rename-registers", &flag_rename_registers
, 1,
1095 "Do the register renaming optimization pass"},
1096 {"common", &flag_no_common
, 0,
1097 "Do not put unitialised globals in the common section" },
1098 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1099 "Do not generate .size directives" },
1100 {"function-sections", &flag_function_sections
, 1,
1101 "place each function into its own section" },
1102 {"data-sections", &flag_data_sections
, 1,
1103 "place data items into their own section" },
1104 {"verbose-asm", &flag_verbose_asm
, 1,
1105 "Add extra commentry to assembler output"},
1106 {"gnu-linker", &flag_gnu_linker
, 1,
1107 "Output GNU ld formatted global initialisers"},
1108 {"regmove", &flag_regmove
, 1,
1109 "Enables a register move optimisation"},
1110 {"optimize-register-move", &flag_regmove
, 1,
1111 "Do the full regmove optimization pass"},
1112 {"pack-struct", &flag_pack_struct
, 1,
1113 "Pack structure members together without holes" },
1114 {"stack-check", &flag_stack_check
, 1,
1115 "Insert stack checking code into the program" },
1116 {"argument-alias", &flag_argument_noalias
, 0,
1117 "Specify that arguments may alias each other & globals"},
1118 {"argument-noalias", &flag_argument_noalias
, 1,
1119 "Assume arguments may alias globals but not each other"},
1120 {"argument-noalias-global", &flag_argument_noalias
, 2,
1121 "Assume arguments do not alias each other or globals" },
1122 {"strict-aliasing", &flag_strict_aliasing
, 1,
1123 "Assume strict aliasing rules apply" },
1124 {"align-loops", &align_loops
, 0,
1125 "Align the start of loops" },
1126 {"align-jumps", &align_jumps
, 0,
1127 "Align labels which are only reached by jumping" },
1128 {"align-labels", &align_labels
, 0,
1129 "Align all labels" },
1130 {"align-functions", &align_functions
, 0,
1131 "Align the start of functions" },
1132 {"check-memory-usage", &flag_check_memory_usage
, 1,
1133 "Generate code to check every memory access" },
1134 {"prefix-function-name", &flag_prefix_function_name
, 1,
1135 "Add a prefix to all function names" },
1136 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1137 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1138 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1139 "Instrument function entry/exit with profiling calls"},
1140 {"ssa", &flag_ssa
, 1,
1141 "Enable SSA optimizations" },
1142 {"dce", &flag_dce
, 1,
1143 "Enable dead code elimination" },
1144 {"leading-underscore", &flag_leading_underscore
, 1,
1145 "External symbols have a leading underscore" },
1146 {"ident", &flag_no_ident
, 0,
1147 "Process #ident directives"},
1148 { "peephole2", &flag_peephole2
, 1,
1149 "Enables an rtl peephole pass run before sched2" },
1150 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1151 "Enables guessing of branch probabilities" },
1152 {"math-errno", &flag_errno_math
, 1,
1153 "Set errno after built-in math functions"},
1154 {"trapping-math", &flag_trapping_math
, 1,
1155 "Floating-point operations can trap"},
1156 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1157 "Allow math optimizations that may violate IEEE or ANSI standards"},
1158 {"bounded-pointers", &flag_bounded_pointers
, 1,
1159 "Compile pointers as triples: value, base & end" },
1160 {"bounds-check", &flag_bounds_check
, 1,
1161 "Generate code to check bounds before dereferencing pointers and arrays" },
1162 {"single-precision-constant", &flag_single_precision_constant
, 1,
1163 "Convert floating point constant to single precision constant"},
1164 {"time-report", &time_report
, 1,
1165 "Report time taken by each compiler pass at end of run"},
1166 {"mem-report", &mem_report
, 1,
1167 "Report on permanent memory allocation at end of run"},
1168 { "trapv", &flag_trapv
, 1,
1169 "Trap for signed overflow in addition / subtraction / multiplication." },
1172 /* Table of language-specific options. */
1174 static struct lang_opt
1177 const char *description
;
1179 documented_lang_options
[] =
1181 /* In order not to overload the --help output, the convention
1182 used here is to only describe those options which are not
1183 enabled by default. */
1185 { "-ansi", "Compile just for ISO C89" },
1186 { "-fallow-single-precision",
1187 "Do not promote floats to double if using -traditional" },
1188 { "-std= ", "Determine language standard"},
1190 { "-fsigned-bitfields", "" },
1191 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1192 { "-fno-signed-bitfields", "" },
1193 { "-fno-unsigned-bitfields","" },
1194 { "-fsigned-char", "Make 'char' be signed by default"},
1195 { "-funsigned-char", "Make 'char' be unsigned by default"},
1196 { "-fno-signed-char", "" },
1197 { "-fno-unsigned-char", "" },
1199 { "-ftraditional", "" },
1200 { "-traditional", "Attempt to support traditional K&R style C"},
1201 { "-fnotraditional", "" },
1202 { "-fno-traditional", "" },
1205 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1206 { "-fbuiltin", "" },
1207 { "-fno-builtin", "Do not recognise any built in functions" },
1208 { "-fhosted", "Assume normal C execution environment" },
1209 { "-fno-hosted", "" },
1211 "Assume that standard libraries & main might not exist" },
1212 { "-fno-freestanding", "" },
1213 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1214 { "-fno-cond-mismatch", "" },
1215 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1216 { "-fno-dollars-in-identifiers", "" },
1217 { "-fpreprocessed", "" },
1218 { "-fno-preprocessed", "" },
1219 { "-fshort-double", "Use the same size for double as for float" },
1220 { "-fno-short-double", "" },
1221 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1222 { "-fno-short-enums", "" },
1223 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1224 { "-fno-short-wchar", "" },
1226 { "-Wall", "Enable most warning messages" },
1227 { "-Wbad-function-cast",
1228 "Warn about casting functions to incompatible types" },
1229 { "-Wno-bad-function-cast", "" },
1230 { "-Wno-missing-noreturn", "" },
1231 { "-Wmissing-format-attribute",
1232 "Warn about functions which might be candidates for format attributes" },
1233 { "-Wno-missing-format-attribute", "" },
1234 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1235 { "-Wno-cast-qual", "" },
1236 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1237 { "-Wno-char-subscripts", "" },
1238 { "-Wcomment", "Warn if nested comments are detected" },
1239 { "-Wno-comment", "" },
1240 { "-Wcomments", "Warn if nested comments are detected" },
1241 { "-Wno-comments", "" },
1242 { "-Wconversion", "Warn about possibly confusing type conversions" },
1243 { "-Wno-conversion", "" },
1244 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1245 { "-Wno-format", "" },
1246 { "-Wformat-y2k", "" },
1247 { "-Wno-format-y2k",
1248 "Don't warn about strftime formats yielding 2 digit years" },
1249 { "-Wformat-extra-args", "" },
1250 { "-Wno-format-extra-args",
1251 "Don't warn about too many arguments to format functions" },
1252 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1253 { "-Wno-format-nonliteral", "" },
1254 { "-Wformat-security",
1255 "Warn about possible security problems with format functions" },
1256 { "-Wno-format-security", "" },
1257 { "-Wimplicit-function-declaration",
1258 "Warn about implicit function declarations" },
1259 { "-Wno-implicit-function-declaration", "" },
1260 { "-Werror-implicit-function-declaration", "" },
1261 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1262 { "-Wno-implicit-int", "" },
1263 { "-Wimplicit", "" },
1264 { "-Wno-implicit", "" },
1265 { "-Wimport", "Warn about the use of the #import directive" },
1266 { "-Wno-import", "" },
1267 { "-Wlong-long","" },
1268 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1269 { "-Wmain", "Warn about suspicious declarations of main" },
1270 { "-Wno-main", "" },
1271 { "-Wmissing-braces",
1272 "Warn about possibly missing braces around initialisers" },
1273 { "-Wno-missing-braces", "" },
1274 { "-Wmissing-declarations",
1275 "Warn about global funcs without previous declarations"},
1276 { "-Wno-missing-declarations", "" },
1277 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1278 { "-Wno-missing-prototypes", "" },
1279 { "-Wmultichar", "Warn about use of multicharacter literals"},
1280 { "-Wno-multichar", "" },
1281 { "-Wnested-externs", "Warn about externs not at file scope level" },
1282 { "-Wno-nested-externs", "" },
1283 { "-Wparentheses", "Warn about possible missing parentheses" },
1284 { "-Wno-parentheses", "" },
1285 { "-Wsequence-point",
1286 "Warn about possible violations of sequence point rules" },
1287 { "-Wno-sequence-point", "" },
1288 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1289 { "-Wno-pointer-arith", "" },
1290 { "-Wredundant-decls",
1291 "Warn about multiple declarations of the same object" },
1292 { "-Wno-redundant-decls", "" },
1293 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1294 { "-Wno-sign-compare", "" },
1295 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1296 { "-Wno-float-equal", "" },
1297 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1298 { "-Wno-unknown-pragmas", "" },
1299 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1300 { "-Wno-strict-prototypes", "" },
1301 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1302 { "-Wno-traditional", "" },
1303 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1304 { "-Wno-trigraphs", "" },
1306 { "-Wno-undef", "" },
1307 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1308 { "-Wno-write-strings", "" },
1310 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1312 #include "options.h"
1316 /* Here is a table, controlled by the tm.h file, listing each -m switch
1317 and which bits in `target_switches' it should set or clear.
1318 If VALUE is positive, it is bits to set.
1319 If VALUE is negative, -VALUE is bits to clear.
1320 (The sign bit is not used so there is no confusion.) */
1326 const char *description
;
1328 target_switches
[] = TARGET_SWITCHES
;
1330 /* This table is similar, but allows the switch to have a value. */
1332 #ifdef TARGET_OPTIONS
1336 const char **variable
;
1337 const char *description
;
1339 target_options
[] = TARGET_OPTIONS
;
1342 /* Options controlling warnings. */
1344 /* Don't print warning messages. -w. */
1346 int inhibit_warnings
= 0;
1348 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1350 int warn_system_headers
= 0;
1352 /* Print various extra warnings. -W. */
1354 int extra_warnings
= 0;
1356 /* Treat warnings as errors. -Werror. */
1358 int warnings_are_errors
= 0;
1360 /* Nonzero to warn about unused variables, functions et.al. */
1362 int warn_unused_function
;
1363 int warn_unused_label
;
1364 int warn_unused_parameter
;
1365 int warn_unused_variable
;
1366 int warn_unused_value
;
1369 set_Wunused (setting
)
1372 warn_unused_function
= setting
;
1373 warn_unused_label
= setting
;
1374 /* Unused function parameter warnings are reported when either ``-W
1375 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1376 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1378 warn_unused_parameter
= 0;
1379 else if (!warn_unused_parameter
)
1380 warn_unused_parameter
= -1;
1381 warn_unused_variable
= setting
;
1382 warn_unused_value
= setting
;
1385 /* Nonzero to warn about code which is never reached. */
1387 int warn_notreached
;
1389 /* Nonzero to warn about variables used before they are initialized. */
1391 int warn_uninitialized
;
1393 /* Nonzero means warn about all declarations which shadow others. */
1397 /* Warn if a switch on an enum fails to have a case for every enum value. */
1401 /* Nonzero means warn about function definitions that default the return type
1402 or that use a null return and have a return-type other than void. */
1404 int warn_return_type
;
1406 /* Nonzero means warn about pointer casts that increase the required
1407 alignment of the target type (and might therefore lead to a crash
1408 due to a misaligned access). */
1410 int warn_cast_align
;
1412 /* Nonzero means warn about any identifiers that match in the first N
1413 characters. The value N is in `id_clash_len'. */
1418 /* Nonzero means warn about any objects definitions whose size is larger
1419 than N bytes. Also want about function definitions whose returned
1420 values are larger than N bytes. The value N is in `larger_than_size'. */
1422 int warn_larger_than
;
1423 HOST_WIDE_INT larger_than_size
;
1425 /* Nonzero means warn if inline function is too large. */
1429 /* Warn if a function returns an aggregate,
1430 since there are often incompatible calling conventions for doing this. */
1432 int warn_aggregate_return
;
1434 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1438 /* Warn when gcc pads a structure to an alignment boundary. */
1442 /* Warn when an optimization pass is disabled. */
1444 int warn_disabled_optimization
;
1446 /* Warn about functions which might be candidates for attribute noreturn. */
1448 int warn_missing_noreturn
;
1450 /* Likewise for -W. */
1452 lang_independent_options W_options
[] =
1454 {"unused-function", &warn_unused_function
, 1, "Warn when a function is unused" },
1455 {"unused-label", &warn_unused_label
, 1, "Warn when a label is unused" },
1456 {"unused-parameter", &warn_unused_parameter
, 1, "Warn when a function parameter is unused" },
1457 {"unused-variable", &warn_unused_variable
, 1, "Warn when a variable is unused" },
1458 {"unused-value", &warn_unused_value
, 1, "Warn when an expression value is unused" },
1459 {"system-headers", &warn_system_headers
, 1, "Do not suppress warnings from system headers"},
1460 {"error", &warnings_are_errors
, 1, ""},
1461 {"shadow", &warn_shadow
, 1, "Warn when one local variable shadows another" },
1462 {"switch", &warn_switch
, 1,
1463 "Warn about enumerated switches missing a specific case" },
1464 {"aggregate-return", &warn_aggregate_return
, 1,
1465 "Warn about returning structures, unions or arrays" },
1466 {"cast-align", &warn_cast_align
, 1,
1467 "Warn about pointer casts which increase alignment" },
1468 {"unreachable-code", &warn_notreached
, 1,
1469 "Warn about code that will never be executed" },
1470 {"uninitialized", &warn_uninitialized
, 1,
1471 "Warn about unitialized automatic variables"},
1472 {"inline", &warn_inline
, 1,
1473 "Warn when an inlined function cannot be inlined"},
1474 {"packed", &warn_packed
, 1,
1475 "Warn when the packed attribute has no effect on struct layout"},
1476 {"padded", &warn_padded
, 1,
1477 "Warn when padding is required to align struct members"},
1478 {"disabled-optimization", &warn_disabled_optimization
, 1,
1479 "Warn when an optimization pass is disabled"},
1480 {"missing-noreturn", &warn_missing_noreturn
, 1,
1481 "Warn about functions which might be candidates for attribute noreturn"}
1484 /* The following routines are useful in setting all the flags that
1485 -ffast-math and -fno-fast-math imply. */
1488 set_fast_math_flags ()
1490 flag_trapping_math
= 0;
1491 flag_unsafe_math_optimizations
= 1;
1492 flag_errno_math
= 0;
1496 set_no_fast_math_flags ()
1498 flag_trapping_math
= 1;
1499 flag_unsafe_math_optimizations
= 0;
1500 flag_errno_math
= 1;
1504 /* Output files for assembler code (real compiler output)
1505 and debugging dumps. */
1508 FILE *aux_info_file
;
1509 FILE *rtl_dump_file
= NULL
;
1511 /* Decode the string P as an integral parameter.
1512 If the string is indeed an integer return its numeric value else
1513 issue an Invalid Option error for the option PNAME and return DEFVAL.
1514 If PNAME is zero just return DEFVAL, do not call error. */
1517 read_integral_parameter (p
, pname
, defval
)
1522 const char *endp
= p
;
1526 if (*endp
>= '0' && *endp
<= '9')
1535 error ("Invalid option `%s'", pname
);
1543 /* This is the default decl_printable_name function. */
1546 decl_name (decl
, verbosity
)
1548 int verbosity ATTRIBUTE_UNUSED
;
1550 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1554 /* This calls abort and is used to avoid problems when abort if a macro.
1555 It is used when we need to pass the address of abort. */
1563 /* When `malloc.c' is compiled with `rcheck' defined,
1564 it calls this function to report clobberage. */
1568 const char *s ATTRIBUTE_UNUSED
;
1573 /* Return the logarithm of X, base 2, considering X unsigned,
1574 if X is a power of 2. Otherwise, returns -1.
1576 This should be used via the `exact_log2' macro. */
1580 register unsigned HOST_WIDE_INT x
;
1582 register int log
= 0;
1583 /* Test for 0 or a power of 2. */
1584 if (x
== 0 || x
!= (x
& -x
))
1586 while ((x
>>= 1) != 0)
1591 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1592 If X is 0, return -1.
1594 This should be used via the floor_log2 macro. */
1598 register unsigned HOST_WIDE_INT x
;
1600 register int log
= -1;
1607 /* Return the approximate positive square root of a number N. This is for
1608 statistical reports, not code generation. */
1623 d
= (s
* s
- x
) / (2 * s
);
1630 static int float_handler_set
;
1632 jmp_buf float_handler
;
1634 /* Signals actually come here. */
1637 float_signal (signo
)
1638 /* If this is missing, some compilers complain. */
1639 int signo ATTRIBUTE_UNUSED
;
1641 if (float_handled
== 0)
1642 crash_signal (signo
);
1643 #if defined (USG) || defined (hpux)
1644 /* Re-enable the signal catcher. */
1645 signal (SIGFPE
, float_signal
);
1648 signal (SIGFPE
, float_signal
);
1649 longjmp (float_handler
, 1);
1652 /* Specify where to longjmp to when a floating arithmetic error happens.
1653 If HANDLER is 0, it means don't handle the errors any more. */
1656 set_float_handler (handler
)
1659 float_handled
= (handler
!= 0);
1661 memcpy (float_handler
, handler
, sizeof (float_handler
));
1663 if (float_handled
&& ! float_handler_set
)
1665 signal (SIGFPE
, float_signal
);
1666 float_handler_set
= 1;
1670 /* This is a wrapper function for code which might elicit an
1671 arithmetic exception. That code should be passed in as a function
1672 pointer FN, and one argument DATA. DATA is usually a struct which
1673 contains the real input and output for function FN. This function
1674 returns 0 (failure) if longjmp was called (i.e. an exception
1675 occured.) It returns 1 (success) otherwise. */
1678 do_float_handler (fn
, data
)
1679 void (*fn
) PARAMS ((PTR
));
1686 /* We got here via longjmp () caused by an exception in function
1688 set_float_handler (NULL
);
1692 set_float_handler (buf
);
1694 set_float_handler (NULL
);
1698 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1699 into ICE messages, which is much more user friendly. */
1702 crash_signal (signo
)
1705 internal_error ("Internal error: %s", strsignal (signo
));
1708 /* Strip off a legitimate source ending from the input string NAME of
1709 length LEN. Rather than having to know the names used by all of
1710 our front ends, we strip off an ending of a period followed by
1711 up to five characters. (Java uses ".class".) */
1714 strip_off_ending (name
, len
)
1719 for (i
= 2; i
< 6 && len
> i
; i
++)
1721 if (name
[len
- i
] == '.')
1723 name
[len
- i
] = '\0';
1729 /* Output a quoted string. */
1732 output_quoted_string (asm_file
, string
)
1736 #ifdef OUTPUT_QUOTED_STRING
1737 OUTPUT_QUOTED_STRING (asm_file
, string
);
1741 putc ('\"', asm_file
);
1742 while ((c
= *string
++) != 0)
1744 if (c
== '\"' || c
== '\\')
1745 putc ('\\', asm_file
);
1748 putc ('\"', asm_file
);
1752 /* Output a file name in the form wanted by System V. */
1755 output_file_directive (asm_file
, input_name
)
1757 const char *input_name
;
1759 int len
= strlen (input_name
);
1760 const char *na
= input_name
+ len
;
1762 /* NA gets INPUT_NAME sans directory names. */
1763 while (na
> input_name
)
1765 if (IS_DIR_SEPARATOR (na
[-1]))
1770 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1771 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1773 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1774 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1776 fprintf (asm_file
, "\t.file\t");
1777 output_quoted_string (asm_file
, na
);
1778 fputc ('\n', asm_file
);
1783 #ifdef ASM_IDENTIFY_LANGUAGE
1784 /* Routine to build language identifier for object file. */
1787 output_lang_identify (asm_out_file
)
1790 int len
= strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1791 char *s
= (char *) alloca (len
);
1793 sprintf (s
, "__gnu_compiled_%s", lang_identify ());
1794 ASM_OUTPUT_LABEL (asm_out_file
, s
);
1798 /* Routine to open a dump file. Return true if the dump file is enabled. */
1801 open_dump_file (index
, decl
)
1802 enum dump_file_index index
;
1806 const char *open_arg
;
1809 if (! dump_file
[index
].enabled
)
1812 timevar_push (TV_DUMP
);
1813 if (rtl_dump_file
!= NULL
)
1814 fclose (rtl_dump_file
);
1816 sprintf (seq
, ".%02d.", index
);
1818 if (! dump_file
[index
].initialized
)
1820 /* If we've not initialized the files, do so now. */
1821 if (graph_dump_format
!= no_graph
1822 && dump_file
[index
].graph_dump_p
)
1824 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1825 clean_graph_dump_file (dump_base_name
, dump_name
);
1828 dump_file
[index
].initialized
= 1;
1834 dump_name
= concat (dump_base_name
, seq
,
1835 dump_file
[index
].extension
, NULL
);
1837 rtl_dump_file
= fopen (dump_name
, open_arg
);
1838 if (rtl_dump_file
== NULL
)
1839 fatal_io_error ("can't open %s", dump_name
);
1844 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1845 decl_printable_name (decl
, 2));
1847 timevar_pop (TV_DUMP
);
1851 /* Routine to close a dump file. */
1854 close_dump_file (index
, func
, insns
)
1855 enum dump_file_index index
;
1856 void (*func
) PARAMS ((FILE *, rtx
));
1859 if (! rtl_dump_file
)
1862 timevar_push (TV_DUMP
);
1864 && graph_dump_format
!= no_graph
1865 && dump_file
[index
].graph_dump_p
)
1870 sprintf (seq
, ".%02d.", index
);
1871 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1872 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1877 func (rtl_dump_file
, insns
);
1879 fflush (rtl_dump_file
);
1880 fclose (rtl_dump_file
);
1882 rtl_dump_file
= NULL
;
1883 timevar_pop (TV_DUMP
);
1886 /* Do any final processing required for the declarations in VEC, of
1887 which there are LEN. We write out inline functions and variables
1888 that have been deferred until this point, but which are required.
1889 Returns non-zero if anything was put out. */
1892 wrapup_global_declarations (vec
, len
)
1899 int output_something
= 0;
1901 for (i
= 0; i
< len
; i
++)
1905 /* We're not deferring this any longer. */
1906 DECL_DEFER_OUTPUT (decl
) = 0;
1908 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1909 && incomplete_decl_finalize_hook
!= 0)
1910 (*incomplete_decl_finalize_hook
) (decl
);
1913 /* Now emit any global variables or functions that we have been
1914 putting off. We need to loop in case one of the things emitted
1915 here references another one which comes earlier in the list. */
1919 for (i
= 0; i
< len
; i
++)
1923 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1926 /* Don't write out static consts, unless we still need them.
1928 We also keep static consts if not optimizing (for debugging),
1929 unless the user specified -fno-keep-static-consts.
1930 ??? They might be better written into the debug information.
1931 This is possible when using DWARF.
1933 A language processor that wants static constants to be always
1934 written out (even if it is not used) is responsible for
1935 calling rest_of_decl_compilation itself. E.g. the C front-end
1936 calls rest_of_decl_compilation from finish_decl.
1937 One motivation for this is that is conventional in some
1938 environments to write things like:
1939 static const char rcsid[] = "... version string ...";
1940 intending to force the string to be in the executable.
1942 A language processor that would prefer to have unneeded
1943 static constants "optimized away" would just defer writing
1944 them out until here. E.g. C++ does this, because static
1945 constants are often defined in header files.
1947 ??? A tempting alternative (for both C and C++) would be
1948 to force a constant to be written if and only if it is
1949 defined in a main file, as opposed to an include file. */
1951 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1952 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1953 && !DECL_COMDAT (decl
))
1955 && flag_keep_static_consts
1956 && !DECL_ARTIFICIAL (decl
))
1957 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1960 rest_of_decl_compilation (decl
, NULL_PTR
, 1, 1);
1963 if (TREE_CODE (decl
) == FUNCTION_DECL
1964 && DECL_INITIAL (decl
) != 0
1965 && DECL_SAVED_INSNS (decl
) != 0
1966 && (flag_keep_inline_functions
1967 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1968 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1971 output_inline_function (decl
);
1976 output_something
= 1;
1980 return output_something
;
1983 /* Issue appropriate warnings for the global declarations in VEC (of
1984 which there are LEN). Output debugging information for them. */
1987 check_global_declarations (vec
, len
)
1994 for (i
= 0; i
< len
; i
++)
1998 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1999 && ! TREE_ASM_WRITTEN (decl
))
2000 /* Cancel the RTL for this decl so that, if debugging info
2001 output for global variables is still to come,
2002 this one will be omitted. */
2003 SET_DECL_RTL (decl
, NULL_RTX
);
2005 /* Warn about any function
2006 declared static but not defined.
2007 We don't warn about variables,
2008 because many programs have static variables
2009 that exist only to get some text into the object file. */
2010 if (TREE_CODE (decl
) == FUNCTION_DECL
2011 && (warn_unused_function
2012 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2013 && DECL_INITIAL (decl
) == 0
2014 && DECL_EXTERNAL (decl
)
2015 && ! DECL_ARTIFICIAL (decl
)
2016 && ! TREE_PUBLIC (decl
))
2018 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2019 pedwarn_with_decl (decl
,
2020 "`%s' used but never defined");
2022 warning_with_decl (decl
,
2023 "`%s' declared `static' but never defined");
2024 /* This symbol is effectively an "extern" declaration now. */
2025 TREE_PUBLIC (decl
) = 1;
2026 assemble_external (decl
);
2029 /* Warn about static fns or vars defined but not used,
2030 but not about inline functions or static consts
2031 since defining those in header files is normal practice. */
2032 if (((warn_unused_function
2033 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2034 || (warn_unused_variable
2035 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2036 && ! DECL_IN_SYSTEM_HEADER (decl
)
2037 && ! DECL_EXTERNAL (decl
)
2038 && ! TREE_PUBLIC (decl
)
2039 && ! TREE_USED (decl
)
2040 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2041 /* The TREE_USED bit for file-scope decls
2042 is kept in the identifier, to handle multiple
2043 external decls in different scopes. */
2044 && ! TREE_USED (DECL_NAME (decl
)))
2045 warning_with_decl (decl
, "`%s' defined but not used");
2047 timevar_push (TV_SYMOUT
);
2048 #ifdef SDB_DEBUGGING_INFO
2049 /* The COFF linker can move initialized global vars to the end.
2050 And that can screw up the symbol ordering.
2051 By putting the symbols in that order to begin with,
2052 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2053 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2054 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2055 && ! DECL_EXTERNAL (decl
)
2056 && DECL_RTL (decl
) != 0)
2057 sdbout_symbol (decl
, 0);
2059 /* Output COFF information for non-global
2060 file-scope initialized variables. */
2061 if (write_symbols
== SDB_DEBUG
2062 && TREE_CODE (decl
) == VAR_DECL
2063 && DECL_INITIAL (decl
)
2064 && ! DECL_EXTERNAL (decl
)
2065 && DECL_RTL (decl
) != 0
2066 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2067 sdbout_toplevel_data (decl
);
2068 #endif /* SDB_DEBUGGING_INFO */
2069 #ifdef DWARF_DEBUGGING_INFO
2070 /* Output DWARF information for file-scope tentative data object
2071 declarations, file-scope (extern) function declarations (which
2072 had no corresponding body) and file-scope tagged type declarations
2073 and definitions which have not yet been forced out. */
2075 if (write_symbols
== DWARF_DEBUG
2076 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2077 dwarfout_file_scope_decl (decl
, 1);
2079 #ifdef DWARF2_DEBUGGING_INFO
2080 /* Output DWARF2 information for file-scope tentative data object
2081 declarations, file-scope (extern) function declarations (which
2082 had no corresponding body) and file-scope tagged type declarations
2083 and definitions which have not yet been forced out. */
2085 if (write_symbols
== DWARF2_DEBUG
2086 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2087 dwarf2out_decl (decl
);
2089 timevar_pop (TV_SYMOUT
);
2093 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2094 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2095 INPUT_FILENAME and LINENO accordingly. */
2098 push_srcloc (file
, line
)
2102 struct file_stack
*fs
;
2104 if (input_file_stack
)
2106 input_file_stack
->name
= input_filename
;
2107 input_file_stack
->line
= lineno
;
2110 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2111 fs
->name
= input_filename
= file
;
2112 fs
->line
= lineno
= line
;
2113 fs
->indent_level
= 0;
2114 fs
->next
= input_file_stack
;
2115 input_file_stack
= fs
;
2116 input_file_stack_tick
++;
2119 /* Pop the top entry off the stack of presently open source files.
2120 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2126 struct file_stack
*fs
;
2128 fs
= input_file_stack
;
2129 input_file_stack
= fs
->next
;
2131 input_file_stack_tick
++;
2132 /* The initial source file is never popped. */
2133 if (!input_file_stack
)
2135 input_filename
= input_file_stack
->name
;
2136 lineno
= input_file_stack
->line
;
2139 /* Compile an entire file of output from cpp, named NAME.
2140 Write a file of assembly output and various debugging dumps. */
2148 int name_specified
= name
!= 0;
2150 if (dump_base_name
== 0)
2151 dump_base_name
= name
? name
: "gccdump";
2156 /* Start timing total execution time. */
2159 timevar_start (TV_TOTAL
);
2161 /* Initialize data in various passes. */
2164 name
= init_parse (name
);
2165 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2166 || debug_info_level
== DINFO_LEVEL_VERBOSE
2167 || flag_test_coverage
2168 || warn_notreached
);
2171 init_decl_processing ();
2177 init_function_once ();
2178 init_stor_layout_once ();
2179 init_varasm_once ();
2180 init_EXPR_INSN_LIST_cache ();
2182 /* The following initialization functions need to generate rtl, so
2183 provide a dummy function context for them. */
2184 init_dummy_function_start ();
2187 if (flag_caller_saves
)
2188 init_caller_save ();
2189 expand_dummy_function_end ();
2191 /* If auxiliary info generation is desired, open the output file.
2192 This goes in the same directory as the source file--unlike
2193 all the other output files. */
2194 if (flag_gen_aux_info
)
2196 aux_info_file
= fopen (aux_info_file_name
, "w");
2197 if (aux_info_file
== 0)
2198 fatal_io_error ("can't open %s", aux_info_file_name
);
2201 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2202 because then the driver will have provided the name of a temporary
2203 file or bit bucket for us. */
2205 if (! name_specified
&& asm_file_name
== 0)
2206 asm_out_file
= stdout
;
2209 if (asm_file_name
== 0)
2211 int len
= strlen (dump_base_name
);
2212 char *dumpname
= (char *) xmalloc (len
+ 6);
2213 memcpy (dumpname
, dump_base_name
, len
+ 1);
2214 strip_off_ending (dumpname
, len
);
2215 strcat (dumpname
, ".s");
2216 asm_file_name
= dumpname
;
2218 if (!strcmp (asm_file_name
, "-"))
2219 asm_out_file
= stdout
;
2221 asm_out_file
= fopen (asm_file_name
, "w");
2222 if (asm_out_file
== 0)
2223 fatal_io_error ("can't open %s for writing", asm_file_name
);
2226 #ifdef IO_BUFFER_SIZE
2227 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2228 _IOFBF
, IO_BUFFER_SIZE
);
2232 name
= ggc_strdup (name
);
2234 input_filename
= name
;
2236 /* Put an entry on the input file stack for the main input file. */
2237 push_srcloc (input_filename
, 0);
2239 /* Perform language-specific initialization.
2240 This may set main_input_filename. */
2241 if (lang_hooks
.init
)
2242 (*lang_hooks
.init
) ();
2244 /* If the input doesn't start with a #line, use the input name
2245 as the official input file name. */
2246 if (main_input_filename
== 0)
2247 main_input_filename
= name
;
2249 if (flag_syntax_only
)
2251 write_symbols
= NO_DEBUG
;
2253 profile_block_flag
= 0;
2257 ASM_FILE_START (asm_out_file
);
2259 #ifdef ASM_COMMENT_START
2260 if (flag_verbose_asm
)
2262 /* Print the list of options in effect. */
2263 print_version (asm_out_file
, ASM_COMMENT_START
);
2264 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2265 ASM_COMMENT_START
, " ", "\n");
2266 /* Add a blank line here so it appears in assembler output but not
2268 fprintf (asm_out_file
, "\n");
2272 /* Output something to inform GDB that this compilation was by GCC. */
2273 #ifndef ASM_IDENTIFY_GCC
2274 fprintf (asm_out_file
, "gcc2_compiled.:\n");
2276 ASM_IDENTIFY_GCC (asm_out_file
);
2279 /* Output something to identify which front-end produced this file. */
2280 #ifdef ASM_IDENTIFY_LANGUAGE
2281 ASM_IDENTIFY_LANGUAGE (asm_out_file
);
2283 } /* ! flag_syntax_only */
2285 #ifndef ASM_OUTPUT_SECTION_NAME
2286 if (flag_function_sections
)
2288 warning ("-ffunction-sections not supported for this target.");
2289 flag_function_sections
= 0;
2291 if (flag_data_sections
)
2293 warning ("-fdata-sections not supported for this target.");
2294 flag_data_sections
= 0;
2298 if (flag_function_sections
2299 && (profile_flag
|| profile_block_flag
))
2301 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2302 flag_function_sections
= 0;
2305 #ifndef OBJECT_FORMAT_ELF
2306 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2307 warning ("-ffunction-sections may affect debugging on some targets.");
2310 /* ??? Note: There used to be a conditional here
2311 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2312 This was to guarantee separation between gcc_compiled. and
2313 the first function, for the sake of dbx on Suns.
2314 However, having the extra zero here confused the Emacs
2315 code for unexec, and might confuse other programs too.
2316 Therefore, I took out that change.
2317 In future versions we should find another way to solve
2318 that dbx problem. -- rms, 23 May 93. */
2320 /* Don't let the first function fall at the same address
2321 as gcc_compiled., if profiling. */
2322 if (profile_flag
|| profile_block_flag
)
2324 /* It's best if we can write a nop here since some
2325 assemblers don't tolerate zeros in the text section. */
2326 output_asm_insn (get_insn_template (CODE_FOR_nop
, NULL
), NULL_PTR
);
2329 /* If dbx symbol table desired, initialize writing it
2330 and output the predefined types. */
2331 timevar_push (TV_SYMOUT
);
2332 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2333 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2334 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2336 #ifdef SDB_DEBUGGING_INFO
2337 if (write_symbols
== SDB_DEBUG
)
2338 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2340 #ifdef DWARF_DEBUGGING_INFO
2341 if (write_symbols
== DWARF_DEBUG
)
2342 dwarfout_init (asm_out_file
, main_input_filename
);
2344 #ifdef DWARF2_UNWIND_INFO
2345 if (dwarf2out_do_frame ())
2346 dwarf2out_frame_init ();
2348 #ifdef DWARF2_DEBUGGING_INFO
2349 if (write_symbols
== DWARF2_DEBUG
)
2350 dwarf2out_init (asm_out_file
, main_input_filename
);
2352 timevar_pop (TV_SYMOUT
);
2354 /* Initialize yet another pass. */
2356 init_final (main_input_filename
);
2357 init_branch_prob (dump_base_name
);
2359 timevar_push (TV_PARSE
);
2361 /* Call the parser, which parses the entire file
2362 (calling rest_of_compilation for each function). */
2364 if (yyparse () != 0)
2366 if (errorcount
== 0)
2367 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2369 /* In case there were missing closebraces,
2370 get us back to the global binding level. */
2371 while (! global_bindings_p ())
2375 /* Compilation is now finished except for writing
2376 what's left of the symbol table output. */
2378 timevar_pop (TV_PARSE
);
2380 if (flag_syntax_only
)
2383 globals
= getdecls ();
2385 /* Really define vars that have had only a tentative definition.
2386 Really output inline functions that must actually be callable
2387 and have not been output so far. */
2390 int len
= list_length (globals
);
2391 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2395 /* Process the decls in reverse order--earliest first.
2396 Put them into VEC from back to front, then take out from front. */
2398 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2399 vec
[len
- i
- 1] = decl
;
2401 wrapup_global_declarations (vec
, len
);
2403 /* This must occur after the loop to output deferred functions. Else
2404 the profiler initializer would not be emitted if all the functions
2405 in this compilation unit were deferred.
2407 output_func_start_profiler can not cause any additional functions or
2408 data to need to be output, so it need not be in the deferred function
2410 output_func_start_profiler ();
2412 /* Now that all possible functions have been output, we can dump
2413 the exception table. */
2415 #ifndef IA64_UNWIND_INFO
2416 output_exception_table ();
2418 free_exception_table ();
2420 check_global_declarations (vec
, len
);
2426 /* Write out any pending weak symbol declarations. */
2430 /* Do dbx symbols. */
2431 timevar_push (TV_SYMOUT
);
2432 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2433 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2434 dbxout_finish (asm_out_file
, main_input_filename
);
2437 #ifdef DWARF_DEBUGGING_INFO
2438 if (write_symbols
== DWARF_DEBUG
)
2442 #ifdef DWARF2_UNWIND_INFO
2443 if (dwarf2out_do_frame ())
2444 dwarf2out_frame_finish ();
2447 #ifdef DWARF2_DEBUGGING_INFO
2448 if (write_symbols
== DWARF2_DEBUG
)
2449 dwarf2out_finish ();
2451 timevar_pop (TV_SYMOUT
);
2453 /* Output some stuff at end of file if nec. */
2455 end_final (dump_base_name
);
2457 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2459 timevar_push (TV_DUMP
);
2460 open_dump_file (DFI_bp
, NULL
);
2464 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2465 timevar_pop (TV_DUMP
);
2469 ASM_FILE_END (asm_out_file
);
2472 /* Language-specific end of compilation actions. */
2474 if (lang_hooks
.finish
)
2475 (*lang_hooks
.finish
) ();
2477 /* Close the dump files. */
2479 if (flag_gen_aux_info
)
2481 fclose (aux_info_file
);
2483 unlink (aux_info_file_name
);
2486 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2488 timevar_push (TV_DUMP
);
2489 dump_combine_total_stats (rtl_dump_file
);
2490 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2491 timevar_pop (TV_DUMP
);
2494 /* Close non-debugging input and output files. Take special care to note
2495 whether fclose returns an error, since the pages might still be on the
2496 buffer chain while the file is open. */
2500 if (ferror (asm_out_file
) != 0)
2501 fatal_io_error ("error writing to %s", asm_file_name
);
2502 if (fclose (asm_out_file
) != 0)
2503 fatal_io_error ("error closing %s", asm_file_name
);
2505 /* Do whatever is necessary to finish printing the graphs. */
2506 if (graph_dump_format
!= no_graph
)
2510 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2511 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2516 sprintf (seq
, ".%02d.", i
);
2517 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2518 finish_graph_dump_file (dump_base_name
, suffix
);
2525 ggc_print_statistics ();
2526 stringpool_statistics ();
2529 /* Free up memory for the benefit of leak detectors. */
2532 /* Stop timing total execution time. */
2533 timevar_stop (TV_TOTAL
);
2535 /* Print the times. */
2537 timevar_print (stderr
);
2540 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2541 and TYPE_DECL nodes.
2543 This does nothing for local (non-static) variables, unless the
2544 variable is a register variable with an ASMSPEC. In that case, or
2545 if the variable is not an automatice, it sets up the RTL and
2546 outputs any assembler code (label definition, storage allocation
2547 and initialization).
2549 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2550 the assembler symbol name to be used. TOP_LEVEL is nonzero
2551 if this declaration is not within a function. */
2554 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2556 const char *asmspec
;
2560 /* Declarations of variables, and of functions defined elsewhere. */
2562 /* The most obvious approach, to put an #ifndef around where
2563 this macro is used, doesn't work since it's inside a macro call. */
2564 #ifndef ASM_FINISH_DECLARE_OBJECT
2565 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2568 /* Forward declarations for nested functions are not "external",
2569 but we need to treat them as if they were. */
2570 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2571 || TREE_CODE (decl
) == FUNCTION_DECL
)
2573 timevar_push (TV_VARCONST
);
2575 make_decl_rtl (decl
, asmspec
);
2576 /* Don't output anything
2577 when a tentative file-scope definition is seen.
2578 But at end of compilation, do output code for them. */
2579 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2580 assemble_variable (decl
, top_level
, at_end
, 0);
2581 if (decl
== last_assemble_variable_decl
)
2583 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2586 timevar_pop (TV_VARCONST
);
2588 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2590 if (decode_reg_name (asmspec
) >= 0)
2592 SET_DECL_RTL (decl
, NULL_RTX
);
2593 make_decl_rtl (decl
, asmspec
);
2597 error ("invalid register name `%s' for register variable", asmspec
);
2598 DECL_REGISTER (decl
) = 0;
2603 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2604 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2605 && TREE_CODE (decl
) == TYPE_DECL
)
2607 timevar_push (TV_SYMOUT
);
2608 dbxout_symbol (decl
, 0);
2609 timevar_pop (TV_SYMOUT
);
2612 #ifdef SDB_DEBUGGING_INFO
2613 else if (write_symbols
== SDB_DEBUG
&& top_level
2614 && TREE_CODE (decl
) == TYPE_DECL
)
2616 timevar_push (TV_SYMOUT
);
2617 sdbout_symbol (decl
, 0);
2618 timevar_pop (TV_SYMOUT
);
2623 /* Called after finishing a record, union or enumeral type. */
2626 rest_of_type_compilation (type
, toplev
)
2627 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2631 tree type ATTRIBUTE_UNUSED
;
2632 int toplev ATTRIBUTE_UNUSED
;
2635 timevar_push (TV_SYMOUT
);
2636 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2637 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2638 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2640 #ifdef SDB_DEBUGGING_INFO
2641 if (write_symbols
== SDB_DEBUG
)
2642 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2644 #ifdef DWARF2_DEBUGGING_INFO
2645 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2646 dwarf2out_decl (TYPE_STUB_DECL (type
));
2648 timevar_pop (TV_SYMOUT
);
2651 /* DECL is an inline function, whose body is present, but which is not
2652 being output at this point. (We're putting that off until we need
2653 to do it.) If there are any actions that need to take place,
2654 including the emission of debugging information for the function,
2655 this is where they should go. This function may be called by
2656 language-dependent code for front-ends that do not even generate
2657 RTL for functions that don't need to be put out. */
2660 note_deferral_of_defined_inline_function (decl
)
2661 tree decl ATTRIBUTE_UNUSED
;
2663 #ifdef DWARF_DEBUGGING_INFO
2664 /* Generate the DWARF info for the "abstract" instance of a function
2665 which we may later generate inlined and/or out-of-line instances
2667 if (write_symbols
== DWARF_DEBUG
2668 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2669 && ! DECL_ABSTRACT_ORIGIN (decl
))
2671 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2672 DWARF code expects it to be set in this case. Intuitively,
2673 DECL is the function we just finished defining, so setting
2674 CURRENT_FUNCTION_DECL is sensible. */
2675 tree saved_cfd
= current_function_decl
;
2676 int was_abstract
= DECL_ABSTRACT (decl
);
2677 current_function_decl
= decl
;
2679 /* Let the DWARF code do its work. */
2680 set_decl_abstract_flags (decl
, 1);
2681 dwarfout_file_scope_decl (decl
, 0);
2683 set_decl_abstract_flags (decl
, 0);
2685 /* Reset CURRENT_FUNCTION_DECL. */
2686 current_function_decl
= saved_cfd
;
2691 /* FNDECL is an inline function which is about to be emitted out of line.
2692 Do any preparation, such as emitting abstract debug info for the inline
2693 before it gets mangled by optimization. */
2696 note_outlining_of_inline_function (fndecl
)
2697 tree fndecl ATTRIBUTE_UNUSED
;
2699 #ifdef DWARF2_DEBUGGING_INFO
2700 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2701 the abstract description of inline functions until something tries to
2702 reference them. Force it out now, before optimizations mangle the
2704 if (write_symbols
== DWARF2_DEBUG
)
2705 dwarf2out_abstract_function (fndecl
);
2709 /* This is called from finish_function (within yyparse)
2710 after each top-level definition is parsed.
2711 It is supposed to compile that function or variable
2712 and output the assembler code for it.
2713 After we return, the tree storage is freed. */
2716 rest_of_compilation (decl
)
2722 int rebuild_label_notes_after_reload
;
2723 int register_life_up_to_date
;
2725 timevar_push (TV_REST_OF_COMPILATION
);
2727 /* Now that we're out of the frontend, we shouldn't have any more
2728 CONCATs anywhere. */
2729 generating_concat_p
= 0;
2731 /* When processing delayed functions, prepare_function_start() won't
2732 have been run to re-initialize it. */
2733 cse_not_expected
= ! optimize
;
2735 /* First, make sure that NOTE_BLOCK is set correctly for each
2736 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2737 if (!cfun
->x_whole_function_mode_p
)
2740 /* Then remove any notes we don't need. That will make iterating
2741 over the instruction sequence faster, and allow the garbage
2742 collector to reclaim the memory used by the notes. */
2743 remove_unnecessary_notes ();
2745 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2746 tree in sensible shape. So, we just recalculate it here. */
2747 if (cfun
->x_whole_function_mode_p
)
2752 /* If we are reconsidering an inline function
2753 at the end of compilation, skip the stuff for making it inline. */
2755 if (DECL_SAVED_INSNS (decl
) == 0)
2761 /* If this is nested inside an inlined external function, pretend
2762 it was only declared. Since we cannot inline such functions,
2763 generating code for this one is not only not necessary but will
2764 confuse some debugging output writers. */
2765 for (parent
= DECL_CONTEXT (current_function_decl
);
2766 parent
!= NULL_TREE
;
2767 parent
= get_containing_scope (parent
))
2768 if (TREE_CODE (parent
) == FUNCTION_DECL
2769 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2771 DECL_INITIAL (decl
) = 0;
2772 goto exit_rest_of_compilation
;
2775 /* If requested, consider whether to make this function inline. */
2776 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2777 || flag_inline_functions
)
2779 timevar_push (TV_INTEGRATION
);
2780 lose
= function_cannot_inline_p (decl
);
2781 timevar_pop (TV_INTEGRATION
);
2782 if (lose
|| ! optimize
)
2784 if (warn_inline
&& DECL_INLINE (decl
))
2785 warning_with_decl (decl
, lose
);
2786 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2787 /* Don't really compile an extern inline function.
2788 If we can't make it inline, pretend
2789 it was only declared. */
2790 if (DECL_EXTERNAL (decl
))
2792 DECL_INITIAL (decl
) = 0;
2793 goto exit_rest_of_compilation
;
2797 /* ??? Note that this has the effect of making it look
2798 like "inline" was specified for a function if we choose
2799 to inline it. This isn't quite right, but it's
2800 probably not worth the trouble to fix. */
2801 inlinable
= DECL_INLINE (decl
) = 1;
2804 insns
= get_insns ();
2806 /* Dump the rtl code if we are dumping rtl. */
2808 if (open_dump_file (DFI_rtl
, decl
))
2810 if (DECL_SAVED_INSNS (decl
))
2811 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2812 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2815 /* If function is inline, and we don't yet know whether to
2816 compile it by itself, defer decision till end of compilation.
2817 finish_compilation will call rest_of_compilation again
2818 for those functions that need to be output. Also defer those
2819 functions that we are supposed to defer. */
2822 || (DECL_INLINE (decl
)
2823 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2824 && ! flag_keep_inline_functions
)
2825 || DECL_EXTERNAL (decl
))))
2826 DECL_DEFER_OUTPUT (decl
) = 1;
2828 if (DECL_INLINE (decl
))
2829 /* DWARF wants seperate debugging info for abstract and
2830 concrete instances of all inline functions, including those
2831 declared inline but not inlined, and those inlined even
2832 though they weren't declared inline. Conveniently, that's
2833 what DECL_INLINE means at this point. */
2834 note_deferral_of_defined_inline_function (decl
);
2836 if (DECL_DEFER_OUTPUT (decl
))
2838 /* If -Wreturn-type, we have to do a bit of compilation. We just
2839 want to call jump_optimize to figure out whether or not we can
2840 fall off the end of the function; we do the minimum amount of
2841 work necessary to make that safe. And, we set optimize to zero
2842 to keep jump_optimize from working too hard. */
2843 if (warn_return_type
)
2845 int saved_optimize
= optimize
;
2848 find_exception_handler_labels ();
2849 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2850 !JUMP_AFTER_REGSCAN
);
2851 optimize
= saved_optimize
;
2854 current_function_nothrow
= nothrow_function_p ();
2855 if (current_function_nothrow
)
2856 /* Now we know that this can't throw; set the flag for the benefit
2857 of other functions later in this translation unit. */
2858 TREE_NOTHROW (current_function_decl
) = 1;
2860 timevar_push (TV_INTEGRATION
);
2861 save_for_inline (decl
);
2862 timevar_pop (TV_INTEGRATION
);
2863 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2864 goto exit_rest_of_compilation
;
2867 /* If specified extern inline but we aren't inlining it, we are
2868 done. This goes for anything that gets here with DECL_EXTERNAL
2869 set, not just things with DECL_INLINE. */
2870 if (DECL_EXTERNAL (decl
))
2871 goto exit_rest_of_compilation
;
2876 /* Initialize some variables used by the optimizers. */
2877 init_function_for_compilation ();
2879 if (! DECL_DEFER_OUTPUT (decl
))
2880 TREE_ASM_WRITTEN (decl
) = 1;
2882 /* Now that integrate will no longer see our rtl, we need not
2883 distinguish between the return value of this function and the
2884 return value of called functions. Also, we can remove all SETs
2885 of subregs of hard registers; they are only here because of
2887 rtx_equal_function_value_matters
= 0;
2888 purge_hard_subreg_sets (get_insns ());
2890 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2891 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2892 goto exit_rest_of_compilation
;
2894 /* Emit code to get eh context, if needed. */
2897 /* We may have potential sibling or tail recursion sites. Select one
2898 (of possibly multiple) methods of performing the call. */
2899 if (flag_optimize_sibling_calls
)
2901 timevar_push (TV_JUMP
);
2902 open_dump_file (DFI_sibling
, decl
);
2904 optimize_sibling_and_tail_recursive_calls ();
2906 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2907 timevar_pop (TV_JUMP
);
2911 /* If we are doing position-independent code generation, now
2912 is the time to output special prologues and epilogues.
2913 We do not want to do this earlier, because it just clutters
2914 up inline functions with meaningless insns. */
2919 insns
= get_insns ();
2921 /* Copy any shared structure that should not be shared. */
2922 unshare_all_rtl (current_function_decl
, insns
);
2924 #ifdef SETJMP_VIA_SAVE_AREA
2925 /* This must be performed before virutal register instantiation. */
2926 if (current_function_calls_alloca
)
2927 optimize_save_area_alloca (insns
);
2930 /* Instantiate all virtual registers. */
2931 instantiate_virtual_regs (current_function_decl
, insns
);
2933 /* Find all the EH handlers. */
2934 find_exception_handler_labels ();
2936 open_dump_file (DFI_jump
, decl
);
2938 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2939 are initialized and to compute whether control can drop off the end
2942 timevar_push (TV_JUMP
);
2943 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2944 before jump optimization switches branch directions. */
2945 expected_value_to_br_prob ();
2947 reg_scan (insns
, max_reg_num (), 0);
2948 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2949 JUMP_AFTER_REGSCAN
);
2951 timevar_pop (TV_JUMP
);
2953 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2954 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2956 close_dump_file (DFI_jump
, print_rtl
, insns
);
2957 goto exit_rest_of_compilation
;
2960 timevar_push (TV_JUMP
);
2964 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2965 cleanup_cfg (insns
);
2967 /* ??? Run if-conversion before delete_null_pointer_checks,
2968 since the later does not preserve the CFG. This should
2969 be changed -- no since converting if's that are going to
2971 timevar_push (TV_IFCVT
);
2973 timevar_pop (TV_IFCVT
);
2975 /* Try to identify useless null pointer tests and delete them. */
2976 if (flag_delete_null_pointer_checks
)
2977 delete_null_pointer_checks (insns
);
2980 /* Jump optimization, and the removal of NULL pointer checks, may
2981 have reduced the number of instructions substantially. CSE, and
2982 future passes, allocate arrays whose dimensions involve the
2983 maximum instruction UID, so if we can reduce the maximum UID
2984 we'll save big on memory. */
2985 renumber_insns (rtl_dump_file
);
2986 timevar_pop (TV_JUMP
);
2988 close_dump_file (DFI_jump
, print_rtl
, insns
);
2992 /* Perform common subexpression elimination.
2993 Nonzero value from `cse_main' means that jumps were simplified
2994 and some code may now be unreachable, so do
2995 jump optimization again. */
2999 open_dump_file (DFI_cse
, decl
);
3000 timevar_push (TV_CSE
);
3002 reg_scan (insns
, max_reg_num (), 1);
3004 if (flag_thread_jumps
)
3006 timevar_push (TV_JUMP
);
3007 thread_jumps (insns
, max_reg_num (), 1);
3008 timevar_pop (TV_JUMP
);
3011 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3013 /* If we are not running more CSE passes, then we are no longer
3014 expecting CSE to be run. But always rerun it in a cheap mode. */
3015 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3017 if (tem
|| optimize
> 1)
3019 timevar_push (TV_JUMP
);
3020 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3021 !JUMP_AFTER_REGSCAN
);
3022 timevar_pop (TV_JUMP
);
3025 /* Run this after jump optmizations remove all the unreachable code
3026 so that unreachable code will not keep values live. */
3027 delete_trivially_dead_insns (insns
, max_reg_num ());
3029 /* Try to identify useless null pointer tests and delete them. */
3030 if (flag_delete_null_pointer_checks
)
3032 timevar_push (TV_JUMP
);
3033 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3035 cleanup_cfg (insns
);
3037 delete_null_pointer_checks (insns
);
3038 timevar_pop (TV_JUMP
);
3041 /* The second pass of jump optimization is likely to have
3042 removed a bunch more instructions. */
3043 renumber_insns (rtl_dump_file
);
3045 timevar_pop (TV_CSE
);
3046 close_dump_file (DFI_cse
, print_rtl
, insns
);
3049 open_dump_file (DFI_addressof
, decl
);
3051 purge_addressof (insns
);
3052 reg_scan (insns
, max_reg_num (), 1);
3054 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3058 if (optimize
> 0 && flag_ssa
)
3060 /* Convert to SSA form. */
3062 timevar_push (TV_TO_SSA
);
3063 open_dump_file (DFI_ssa
, decl
);
3065 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3066 cleanup_cfg (insns
);
3069 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3070 timevar_pop (TV_TO_SSA
);
3072 /* The SSA implementation uses basic block numbers in its phi
3073 nodes. Thus, changing the control-flow graph or the basic
3074 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3075 may cause problems. */
3079 /* Remove dead code. */
3081 timevar_push (TV_DEAD_CODE_ELIM
);
3082 open_dump_file (DFI_dce
, decl
);
3084 insns
= get_insns ();
3085 eliminate_dead_code();
3087 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3088 timevar_pop (TV_DEAD_CODE_ELIM
);
3091 /* Convert from SSA form. */
3093 timevar_push (TV_FROM_SSA
);
3094 open_dump_file (DFI_ussa
, decl
);
3096 convert_from_ssa ();
3097 /* New registers have been created. Rescan their usage. */
3098 reg_scan (insns
, max_reg_num (), 1);
3099 /* Life analysis used in SSA adds log_links but these
3100 shouldn't be there until the flow stage, so clear
3102 clear_log_links (insns
);
3104 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3105 timevar_pop (TV_FROM_SSA
);
3110 /* Perform global cse. */
3112 if (optimize
> 0 && flag_gcse
)
3114 int save_csb
, save_cfj
;
3117 timevar_push (TV_GCSE
);
3118 open_dump_file (DFI_gcse
, decl
);
3120 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3121 cleanup_cfg (insns
);
3122 tem
= gcse_main (insns
, rtl_dump_file
);
3124 save_csb
= flag_cse_skip_blocks
;
3125 save_cfj
= flag_cse_follow_jumps
;
3126 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3128 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3130 if (flag_expensive_optimizations
)
3132 timevar_push (TV_CSE
);
3133 reg_scan (insns
, max_reg_num (), 1);
3134 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3135 timevar_pop (TV_CSE
);
3136 cse_not_expected
= !flag_rerun_cse_after_loop
;
3139 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3140 things up. Then possibly re-run CSE again. */
3144 timevar_push (TV_JUMP
);
3145 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3146 !JUMP_AFTER_REGSCAN
);
3147 timevar_pop (TV_JUMP
);
3149 if (flag_expensive_optimizations
)
3151 timevar_push (TV_CSE
);
3152 reg_scan (insns
, max_reg_num (), 1);
3153 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3154 timevar_pop (TV_CSE
);
3158 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3159 timevar_pop (TV_GCSE
);
3162 flag_cse_skip_blocks
= save_csb
;
3163 flag_cse_follow_jumps
= save_cfj
;
3166 /* Move constant computations out of loops. */
3170 timevar_push (TV_LOOP
);
3171 open_dump_file (DFI_loop
, decl
);
3173 if (flag_rerun_loop_opt
)
3175 /* We only want to perform unrolling once. */
3177 loop_optimize (insns
, rtl_dump_file
, 0);
3179 /* The first call to loop_optimize makes some instructions
3180 trivially dead. We delete those instructions now in the
3181 hope that doing so will make the heuristics in loop work
3182 better and possibly speed up compilation. */
3183 delete_trivially_dead_insns (insns
, max_reg_num ());
3185 /* The regscan pass is currently necessary as the alias
3186 analysis code depends on this information. */
3187 reg_scan (insns
, max_reg_num (), 1);
3189 loop_optimize (insns
, rtl_dump_file
,
3190 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3192 close_dump_file (DFI_loop
, print_rtl
, insns
);
3193 timevar_pop (TV_LOOP
);
3200 timevar_push (TV_CSE2
);
3201 open_dump_file (DFI_cse2
, decl
);
3203 if (flag_rerun_cse_after_loop
)
3205 /* Running another jump optimization pass before the second
3206 cse pass sometimes simplifies the RTL enough to allow
3207 the second CSE pass to do a better job. Jump_optimize can change
3208 max_reg_num so we must rerun reg_scan afterwards.
3209 ??? Rework to not call reg_scan so often. */
3210 timevar_push (TV_JUMP
);
3212 reg_scan (insns
, max_reg_num (), 0);
3213 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3214 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3216 timevar_push (TV_IFCVT
);
3218 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3219 cleanup_cfg (insns
);
3222 timevar_pop(TV_IFCVT
);
3224 timevar_pop (TV_JUMP
);
3226 reg_scan (insns
, max_reg_num (), 0);
3227 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3231 timevar_push (TV_JUMP
);
3232 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3233 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3234 timevar_pop (TV_JUMP
);
3238 if (flag_thread_jumps
)
3240 /* This pass of jump threading straightens out code
3241 that was kinked by loop optimization. */
3242 timevar_push (TV_JUMP
);
3243 reg_scan (insns
, max_reg_num (), 0);
3244 thread_jumps (insns
, max_reg_num (), 0);
3245 timevar_pop (TV_JUMP
);
3248 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3249 timevar_pop (TV_CSE2
);
3254 cse_not_expected
= 1;
3258 /* Do control and data flow analysis; wrote some of the results to
3261 timevar_push (TV_FLOW
);
3262 open_dump_file (DFI_cfg
, decl
);
3264 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3265 cleanup_cfg (insns
);
3266 check_function_return_warnings ();
3268 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3270 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3272 timevar_push (TV_BRANCH_PROB
);
3273 open_dump_file (DFI_bp
, decl
);
3277 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3278 timevar_pop (TV_BRANCH_PROB
);
3281 open_dump_file (DFI_life
, decl
);
3286 /* Discover and record the loop depth at the head of each basic
3287 block. The loop infrastructure does the real job for us. */
3288 flow_loops_find (&loops
, LOOP_TREE
);
3290 /* Estimate using heuristics if no profiling info is available. */
3291 if (flag_guess_branch_prob
)
3292 estimate_probability (&loops
);
3295 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3297 flow_loops_free (&loops
);
3299 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3300 mark_constant_function ();
3301 timevar_pop (TV_FLOW
);
3303 register_life_up_to_date
= 1;
3306 if (warn_uninitialized
|| extra_warnings
)
3308 uninitialized_vars_warning (DECL_INITIAL (decl
));
3310 setjmp_args_warning ();
3313 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3317 /* If -opt, try combining insns through substitution. */
3321 int rebuild_jump_labels_after_combine
= 0;
3323 timevar_push (TV_COMBINE
);
3324 open_dump_file (DFI_combine
, decl
);
3326 rebuild_jump_labels_after_combine
3327 = combine_instructions (insns
, max_reg_num ());
3329 /* Combining insns may have turned an indirect jump into a
3330 direct jump. Rebuid the JUMP_LABEL fields of jumping
3332 if (rebuild_jump_labels_after_combine
)
3334 timevar_push (TV_JUMP
);
3335 rebuild_jump_labels (insns
);
3336 timevar_pop (TV_JUMP
);
3338 timevar_push (TV_FLOW
);
3339 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3340 cleanup_cfg (insns
);
3342 /* Blimey. We've got to have the CFG up to date for the call to
3343 if_convert below. However, the random deletion of blocks
3344 without updating life info can wind up with Wierd Stuff in
3345 global_live_at_end. We then run sched1, which updates things
3346 properly, discovers the wierdness and aborts. */
3347 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3348 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3349 | PROP_SCAN_DEAD_CODE
);
3351 timevar_pop (TV_FLOW
);
3354 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3355 timevar_pop (TV_COMBINE
);
3360 /* Rerun if-conversion, as combine may have simplified things enough to
3361 now meet sequence length restrictions. */
3364 timevar_push (TV_IFCVT
);
3365 open_dump_file (DFI_ce
, decl
);
3371 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3372 timevar_pop (TV_IFCVT
);
3375 /* Register allocation pre-pass, to reduce number of moves
3376 necessary for two-address machines. */
3377 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3379 timevar_push (TV_REGMOVE
);
3380 open_dump_file (DFI_regmove
, decl
);
3382 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3384 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3385 timevar_pop (TV_REGMOVE
);
3390 /* Any of the several passes since flow1 will have munged register
3391 lifetime data a bit. */
3393 register_life_up_to_date
= 0;
3395 #ifdef OPTIMIZE_MODE_SWITCHING
3396 timevar_push (TV_GCSE
);
3398 if (optimize_mode_switching (NULL_PTR
))
3400 /* We did work, and so had to regenerate global life information.
3401 Take advantage of this and don't re-recompute register life
3402 information below. */
3403 register_life_up_to_date
= 1;
3406 timevar_pop (TV_GCSE
);
3409 #ifdef INSN_SCHEDULING
3411 /* Print function header into sched dump now
3412 because doing the sched analysis makes some of the dump. */
3413 if (optimize
> 0 && flag_schedule_insns
)
3415 timevar_push (TV_SCHED
);
3416 open_dump_file (DFI_sched
, decl
);
3418 /* Do control and data sched analysis,
3419 and write some of the results to dump file. */
3421 schedule_insns (rtl_dump_file
);
3423 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3424 timevar_pop (TV_SCHED
);
3428 /* Register lifetime information was updated as part of verifying
3430 register_life_up_to_date
= 1;
3434 /* Determine if the current function is a leaf before running reload
3435 since this can impact optimizations done by the prologue and
3436 epilogue thus changing register elimination offsets. */
3437 current_function_is_leaf
= leaf_function_p ();
3439 timevar_push (TV_LOCAL_ALLOC
);
3440 open_dump_file (DFI_lreg
, decl
);
3442 /* Allocate pseudo-regs that are used only within 1 basic block.
3444 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3445 jump optimizer after register allocation and reloading are finished. */
3447 if (! register_life_up_to_date
)
3448 recompute_reg_usage (insns
, ! optimize_size
);
3449 regclass (insns
, max_reg_num (), rtl_dump_file
);
3450 rebuild_label_notes_after_reload
= local_alloc ();
3452 timevar_pop (TV_LOCAL_ALLOC
);
3454 if (dump_file
[DFI_lreg
].enabled
)
3456 timevar_push (TV_DUMP
);
3458 dump_flow_info (rtl_dump_file
);
3459 dump_local_alloc (rtl_dump_file
);
3461 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3462 timevar_pop (TV_DUMP
);
3467 timevar_push (TV_GLOBAL_ALLOC
);
3468 open_dump_file (DFI_greg
, decl
);
3470 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3471 pass fixing up any insns that are invalid. */
3474 failure
= global_alloc (rtl_dump_file
);
3477 build_insn_chain (insns
);
3478 failure
= reload (insns
, 0);
3481 timevar_pop (TV_GLOBAL_ALLOC
);
3483 if (dump_file
[DFI_greg
].enabled
)
3485 timevar_push (TV_DUMP
);
3487 dump_global_regs (rtl_dump_file
);
3489 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3490 timevar_pop (TV_DUMP
);
3494 goto exit_rest_of_compilation
;
3498 open_dump_file (DFI_postreload
, decl
);
3500 /* Do a very simple CSE pass over just the hard registers. */
3503 timevar_push (TV_RELOAD_CSE_REGS
);
3504 reload_cse_regs (insns
);
3505 timevar_pop (TV_RELOAD_CSE_REGS
);
3508 /* If optimizing, then go ahead and split insns now since we are about
3509 to recompute flow information anyway. Since we can't split insns after
3510 reload, do the splitting unconditionally here to avoid gcc from losing
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 (_(" --param <name>=<value> Set constant controlling optimization\n"));
3857 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3858 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3859 printf (_(" -w Suppress warnings\n"));
3860 printf (_(" -W Enable extra warnings\n"));
3862 for (i
= ARRAY_SIZE (W_options
); i
--;)
3864 const char *description
= W_options
[i
].description
;
3866 if (description
!= NULL
&& * description
!= 0)
3867 printf (" -W%-21s %s\n",
3868 W_options
[i
].string
, description
);
3871 printf (_(" -Wunused Enable unused warnings\n"));
3872 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3873 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3874 printf (_(" -p Enable function profiling\n"));
3875 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3876 printf (_(" -a Enable block profiling \n"));
3878 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3879 printf (_(" -ax Enable jump profiling \n"));
3881 printf (_(" -o <file> Place output into <file> \n"));
3883 -G <number> Put global and static data smaller than <number>\n\
3884 bytes into a special section (on some targets)\n"));
3886 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3888 if (debug_args
[i
].description
!= NULL
)
3889 printf (" -g%-21s %s\n",
3890 debug_args
[i
].arg
, debug_args
[i
].description
);
3893 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3894 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3895 printf (_(" -version Display the compiler's version\n"));
3896 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3897 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3898 #if defined INSN_SCHEDULING
3899 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3901 printf (_(" --help Display this information\n"));
3906 /* Display descriptions of language specific options.
3907 If there is no description, note that there is an undocumented option.
3908 If the description is empty, do not display anything. (This allows
3909 options to be deliberately undocumented, for whatever reason).
3910 If the option string is missing, then this is a marker, indicating
3911 that the description string is in fact the name of a language, whose
3912 language specific options are to follow. */
3914 if (ARRAY_SIZE (documented_lang_options
) > 1)
3916 printf (_("\nLanguage specific options:\n"));
3918 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3920 const char *description
= documented_lang_options
[i
].description
;
3921 const char *option
= documented_lang_options
[i
].option
;
3923 if (description
== NULL
)
3928 printf (_(" %-23.23s [undocumented]\n"), option
);
3930 else if (*description
== 0)
3932 else if (option
== NULL
)
3936 (_("\nThere are undocumented %s specific options as well.\n"),
3940 printf (_("\n Options for %s:\n"), description
);
3945 printf (" %-23.23s %s\n", option
, description
);
3950 printf (_("\nThere are undocumented %s specific options as well.\n"),
3953 display_target_options ();
3957 display_target_options ()
3961 if (ARRAY_SIZE (target_switches
) > 1
3962 #ifdef TARGET_OPTIONS
3963 || ARRAY_SIZE (target_options
) > 1
3971 printf (_("\nTarget specific options:\n"));
3973 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3975 const char *option
= target_switches
[i
].name
;
3976 const char *description
= target_switches
[i
].description
;
3978 if (option
== NULL
|| *option
== 0)
3980 else if (description
== NULL
)
3985 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3987 else if (* description
!= 0)
3988 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3991 #ifdef TARGET_OPTIONS
3992 for (i
= ARRAY_SIZE (target_options
); i
--;)
3994 const char *option
= target_options
[i
].prefix
;
3995 const char *description
= target_options
[i
].description
;
3997 if (option
== NULL
|| *option
== 0)
3999 else if (description
== NULL
)
4004 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4006 else if (* description
!= 0)
4007 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
4013 printf (_("\nThere are undocumented target specific options as well.\n"));
4015 printf (_(" They exist, but they are not documented.\n"));
4020 /* Parse a -d... comand line switch. */
4023 decode_d_option (arg
)
4032 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4033 dump_file
[i
].enabled
= 1;
4042 flag_print_asm_name
= 1;
4045 flag_dump_rtl_in_asm
= 1;
4046 flag_print_asm_name
= 1;
4049 graph_dump_format
= vcg
;
4052 rtl_dump_and_exit
= 1;
4057 case 'D': /* These are handled by the preprocessor. */
4063 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4064 if (c
== dump_file
[i
].debug_switch
)
4066 dump_file
[i
].enabled
= 1;
4071 warning ("unrecognized gcc debugging option: %c", c
);
4076 /* Parse a -f... comand line switch. ARG is the value after the -f.
4077 It is safe to access 'ARG - 2' to generate the full switch name.
4078 Return the number of strings consumed. */
4081 decode_f_option (arg
)
4085 const char *option_value
= NULL
;
4087 /* Search for the option in the table of binary f options. */
4088 for (j
= ARRAY_SIZE (f_options
); j
--;)
4090 if (!strcmp (arg
, f_options
[j
].string
))
4092 *f_options
[j
].variable
= f_options
[j
].on_value
;
4096 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4097 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4099 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4104 if (!strcmp (arg
, "fast-math"))
4105 set_fast_math_flags();
4106 else if (!strcmp (arg
, "no-fast-math"))
4107 set_no_fast_math_flags();
4108 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4109 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4112 read_integral_parameter (option_value
, arg
- 2,
4114 set_param_value ("max-inline-insns", val
);
4116 #ifdef INSN_SCHEDULING
4117 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4118 fix_sched_param ("verbose", option_value
);
4120 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4121 fix_register (option_value
, 1, 1);
4122 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4123 fix_register (option_value
, 0, 1);
4124 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4125 fix_register (option_value
, 0, 0);
4126 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4127 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4128 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4130 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4131 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4132 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4133 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4135 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4136 else if ((option_value
4137 = skip_leading_substring (arg
, "stack-limit-register=")))
4139 int reg
= decode_reg_name (option_value
);
4141 error ("unrecognized register name `%s'", option_value
);
4143 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4145 else if ((option_value
4146 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4149 nm
= ggc_strdup (option_value
);
4150 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4152 else if ((option_value
4153 = skip_leading_substring (arg
, "message-length=")))
4154 diagnostic_message_length_per_line
=
4155 read_integral_parameter (option_value
, arg
- 2,
4156 diagnostic_message_length_per_line
);
4157 else if ((option_value
4158 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4160 if (!strcmp (option_value
, "once"))
4161 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4162 else if (!strcmp (option_value
, "every-line"))
4163 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4165 error ("Unrecognized option `%s'", arg
- 2);
4167 else if (!strcmp (arg
, "no-stack-limit"))
4168 stack_limit_rtx
= NULL_RTX
;
4169 else if (!strcmp (arg
, "preprocessed"))
4170 /* Recognise this switch but do nothing. This prevents warnings
4171 about an unrecognized switch if cpplib has not been linked in. */
4179 /* Parse a -W... comand line switch. ARG is the value after the -W.
4180 It is safe to access 'ARG - 2' to generate the full switch name.
4181 Return the number of strings consumed. */
4184 decode_W_option (arg
)
4187 const char *option_value
= NULL
;
4190 /* Search for the option in the table of binary W options. */
4192 for (j
= ARRAY_SIZE (W_options
); j
--;)
4194 if (!strcmp (arg
, W_options
[j
].string
))
4196 *W_options
[j
].variable
= W_options
[j
].on_value
;
4200 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4201 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4203 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4208 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4210 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4212 if (id_clash_len
!= -1)
4215 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4217 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4219 warn_larger_than
= larger_than_size
!= -1;
4221 else if (!strcmp (arg
, "unused"))
4225 else if (!strcmp (arg
, "no-unused"))
4235 /* Parse a -g... comand line switch. ARG is the value after the -g.
4236 It is safe to access 'ARG - 2' to generate the full switch name.
4237 Return the number of strings consumed. */
4240 decode_g_option (arg
)
4244 /* A lot of code assumes write_symbols == NO_DEBUG if the
4245 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4246 of what debugging type has been selected). This records the
4247 selected type. It is an error to specify more than one
4249 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4250 /* Non-zero if debugging format has been explicitly set.
4251 -g and -ggdb don't explicitly set the debugging format so
4252 -gdwarf -g3 is equivalent to -gdwarf3. */
4253 static int type_explicitly_set_p
= 0;
4254 /* Indexed by enum debug_info_type. */
4255 static const char *debug_type_names
[] =
4257 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4260 /* The maximum admissible debug level value. */
4261 static const unsigned max_debug_level
= 3;
4263 /* Look up ARG in the table. */
4264 for (da
= debug_args
; da
->arg
; da
++)
4266 const int da_len
= strlen (da
->arg
);
4268 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4270 enum debug_info_type type
= da
->debug_type
;
4271 const char *p
= arg
+ da_len
;
4273 if (*p
&& (*p
< '0' || *p
> '9'))
4276 /* A debug flag without a level defaults to level 2.
4277 Note we do not want to call read_integral_parameter
4278 for that case since it will call atoi which
4281 ??? We may want to generalize the interface to
4282 read_integral_parameter to better handle this case
4283 if this case shows up often. */
4285 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4289 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4291 error ("use -gdwarf -g%d for DWARF v1, level %d",
4294 error ("use -gdwarf-2 for DWARF v2");
4297 if (level
> max_debug_level
)
4300 ignoring option `%s' due to invalid debug level specification",
4302 level
= debug_info_level
;
4305 if (type
== NO_DEBUG
)
4307 type
= PREFERRED_DEBUGGING_TYPE
;
4309 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4311 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4312 type
= DWARF2_DEBUG
;
4314 #ifdef DBX_DEBUGGING_INFO
4321 if (type
== NO_DEBUG
)
4322 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4324 /* Does it conflict with an already selected type? */
4325 if (type_explicitly_set_p
4326 /* -g/-ggdb don't conflict with anything. */
4327 && da
->debug_type
!= NO_DEBUG
4328 && type
!= selected_debug_type
)
4329 warning ("`%s' ignored, conflicts with `-g%s'",
4330 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4333 /* If the format has already been set, -g/-ggdb
4334 only change the debug level. */
4335 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4336 /* Don't change debugging type. */
4340 selected_debug_type
= type
;
4341 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4344 write_symbols
= (level
== 0
4346 : selected_debug_type
);
4347 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4348 debug_info_level
= (enum debug_info_level
) level
;
4361 /* Decode the first argument in the argv as a language-independent option.
4362 Return the number of strings consumed. */
4365 independent_decode_option (argc
, argv
)
4369 char *arg
= argv
[0];
4371 if (arg
[0] != '-' || arg
[1] == 0)
4383 if (!strcmp (arg
, "-help"))
4386 exit_after_options
= 1;
4389 if (!strcmp (arg
, "-target-help"))
4391 display_target_options ();
4392 exit_after_options
= 1;
4395 if (!strcmp (arg
, "-version"))
4397 print_version (stderr
, "");
4398 exit_after_options
= 1;
4401 /* Handle '--param <name>=<value>'. */
4402 if (strcmp (arg
, "-param") == 0)
4408 error ("-param option missing argument");
4412 /* Get the '<name>=<value>' parameter. */
4414 /* Look for the `='. */
4415 equal
= strchr (arg
, '=');
4417 error ("invalid --param option: %s", arg
);
4422 /* Zero out the `=' sign so that we get two separate strings. */
4424 /* Figure out what value is specified. */
4425 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4426 if (val
!= INVALID_PARAM_VAL
)
4427 set_param_value (arg
, val
);
4429 error ("invalid parameter value `%s'", equal
+ 1);
4444 /* Already been treated in main (). Do nothing. */
4448 set_target_switch (arg
+ 1);
4452 return decode_f_option (arg
+ 1);
4455 return decode_g_option (arg
+ 1);
4458 if (!strcmp (arg
, "dumpbase"))
4463 dump_base_name
= argv
[1];
4467 decode_d_option (arg
+ 1);
4471 if (!strcmp (arg
, "pedantic"))
4473 else if (!strcmp (arg
, "pedantic-errors"))
4474 flag_pedantic_errors
= pedantic
= 1;
4475 else if (arg
[1] == 0)
4482 if (!strcmp (arg
, "quiet"))
4489 if (!strcmp (arg
, "version"))
4497 inhibit_warnings
= 1;
4506 /* We save the value of warn_uninitialized, since if they put
4507 -Wuninitialized on the command line, we need to generate a
4508 warning about not using it without also specifying -O. */
4509 if (warn_uninitialized
!= 1)
4510 warn_uninitialized
= 2;
4513 return decode_W_option (arg
+ 1);
4519 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4520 warning ("`-a' option (basic block profile) not supported");
4522 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4525 else if (!strcmp (arg
, "ax"))
4527 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4528 warning ("`-ax' option (jump profiling) not supported");
4530 profile_block_flag
= (!profile_block_flag
4531 || profile_block_flag
== 2) ? 2 : 3;
4534 else if (!strncmp (arg
, "aux-info", 8))
4536 flag_gen_aux_info
= 1;
4542 aux_info_file_name
= argv
[1];
4546 aux_info_file_name
= arg
+ 8;
4558 asm_file_name
= argv
[1];
4573 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4578 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4582 if (g_switch_val
== -1)
4586 g_switch_set
= TRUE
;
4587 g_switch_value
= g_switch_val
;
4597 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4598 Decode command args, then call compile_file.
4599 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4600 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4602 It is not safe to call this function more than once. */
4605 toplev_main (argc
, argv
)
4612 /* save in case md file wants to emit args as a comment. */
4616 p
= argv
[0] + strlen (argv
[0]);
4617 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4621 xmalloc_set_program_name (progname
);
4623 /* LC_CTYPE determines the character set used by the terminal so it has be set
4624 to output messages correctly. */
4626 #ifdef HAVE_LC_MESSAGES
4627 setlocale (LC_CTYPE
, "");
4628 setlocale (LC_MESSAGES
, "");
4630 setlocale (LC_ALL
, "");
4633 (void) bindtextdomain (PACKAGE
, localedir
);
4634 (void) textdomain (PACKAGE
);
4636 /* Install handler for SIGFPE, which may be received while we do
4637 compile-time floating point arithmetic. */
4638 signal (SIGFPE
, float_signal
);
4640 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4642 signal (SIGSEGV
, crash_signal
);
4645 signal (SIGILL
, crash_signal
);
4648 signal (SIGBUS
, crash_signal
);
4651 signal (SIGABRT
, crash_signal
);
4653 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4654 signal (SIGIOT
, crash_signal
);
4657 decl_printable_name
= decl_name
;
4658 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4660 /* Initialize whether `char' is signed. */
4661 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4662 #ifdef DEFAULT_SHORT_ENUMS
4663 /* Initialize how much space enums occupy, by default. */
4664 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4667 /* Initialize the garbage-collector. */
4670 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4671 ggc_add_tree_root (¤t_function_decl
, 1);
4672 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4674 /* Initialize the diagnostics reporting machinery. */
4675 initialize_diagnostics ();
4677 /* Register the language-independent parameters. */
4678 add_params (lang_independent_params
, LAST_PARAM
);
4680 /* Perform language-specific options intialization. */
4681 if (lang_hooks
.init_options
)
4682 (*lang_hooks
.init_options
) ();
4684 /* Scan to see what optimization level has been specified. That will
4685 determine the default value of many flags. */
4686 for (i
= 1; i
< argc
; i
++)
4688 if (!strcmp (argv
[i
], "-O"))
4693 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4695 /* Handle -Os, -O2, -O3, -O69, ... */
4696 char *p
= &argv
[i
][2];
4698 if ((p
[0] == 's') && (p
[1] == 0))
4702 /* Optimizing for size forces optimize to be 2. */
4707 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4708 if (optimize_val
!= -1)
4710 optimize
= optimize_val
;
4720 flag_thread_jumps
= 1;
4722 flag_delayed_branch
= 1;
4724 #ifdef CAN_DEBUG_WITHOUT_FP
4725 flag_omit_frame_pointer
= 1;
4727 flag_guess_branch_prob
= 1;
4732 flag_optimize_sibling_calls
= 1;
4733 flag_cse_follow_jumps
= 1;
4734 flag_cse_skip_blocks
= 1;
4736 flag_expensive_optimizations
= 1;
4737 flag_strength_reduce
= 1;
4738 flag_rerun_cse_after_loop
= 1;
4739 flag_rerun_loop_opt
= 1;
4740 flag_caller_saves
= 1;
4743 #ifdef INSN_SCHEDULING
4744 flag_schedule_insns
= 1;
4745 flag_schedule_insns_after_reload
= 1;
4748 flag_strict_aliasing
= 1;
4749 flag_delete_null_pointer_checks
= 1;
4750 flag_reorder_blocks
= 1;
4755 flag_inline_functions
= 1;
4756 flag_rename_registers
= 1;
4759 if (optimize
< 2 || optimize_size
)
4764 align_functions
= 1;
4767 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4770 set_target_switch ("");
4772 /* Unwind tables are always present in an ABI-conformant IA-64
4773 object file, so the default should be ON. */
4774 #ifdef IA64_UNWIND_INFO
4775 flag_unwind_tables
= IA64_UNWIND_INFO
;
4778 #ifdef OPTIMIZATION_OPTIONS
4779 /* Allow default optimizations to be specified on a per-machine basis. */
4780 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4783 /* Initialize register usage now so switches may override. */
4786 /* Perform normal command line switch decoding. */
4787 for (i
= 1; i
< argc
;)
4789 unsigned int lang_processed
;
4790 unsigned int indep_processed
;
4792 /* Give the language a chance to decode the option for itself. */
4793 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4795 /* Now see if the option also has a language independent meaning.
4796 Some options are both language specific and language independent,
4798 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4800 if (lang_processed
|| indep_processed
)
4801 i
+= MAX (lang_processed
, indep_processed
);
4804 const char *option
= NULL
;
4805 const char *lang
= NULL
;
4808 /* It is possible that the command line switch is not valid for the
4809 current language, but it is valid for another language. In order
4810 to be compatible with previous versions of the compiler (which
4811 did not issue an error message in this case) we check for this
4812 possibility here. If we do find a match, then if extra_warnings
4813 is set we generate a warning message, otherwise we will just
4814 ignore the option. */
4815 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4817 option
= documented_lang_options
[j
].option
;
4820 lang
= documented_lang_options
[j
].description
;
4821 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4825 if (j
!= ARRAY_SIZE (documented_lang_options
))
4829 warning ("Ignoring command line option '%s'", argv
[i
]);
4832 ("(It is valid for %s but not the selected language)",
4836 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4837 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4839 error ("Unrecognized option `%s'", argv
[i
]);
4845 /* All command line options have been processed. */
4846 if (lang_hooks
.post_options
)
4847 (*lang_hooks
.post_options
) ();
4849 if (exit_after_options
)
4852 /* Reflect any language-specific diagnostic option setting. */
4853 reshape_diagnostic_buffer ();
4855 /* Checker uses the frame pointer. */
4856 if (flag_check_memory_usage
)
4857 flag_omit_frame_pointer
= 0;
4861 /* Inlining does not work if not optimizing,
4862 so force it not to be done. */
4866 /* The c_decode_option function and decode_option hook set
4867 this to `2' if -Wall is used, so we can avoid giving out
4868 lots of errors for people who don't realize what -Wall does. */
4869 if (warn_uninitialized
== 1)
4870 warning ("-Wuninitialized is not supported without -O");
4873 #ifdef OVERRIDE_OPTIONS
4874 /* Some machines may reject certain combinations of options. */
4878 /* Since each function gets its own handler data, we can't support the
4879 new model currently, since it depend on a specific rethrow label
4880 which is declared at the front of the table, and we can only
4881 have one such symbol in a file. */
4882 #ifdef IA64_UNWIND_INFO
4883 flag_new_exceptions
= 0;
4886 /* Set up the align_*_log variables, defaulting them to 1 if they
4887 were still unset. */
4888 if (align_loops
<= 0) align_loops
= 1;
4889 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4890 if (align_jumps
<= 0) align_jumps
= 1;
4891 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4892 if (align_labels
<= 0) align_labels
= 1;
4893 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4894 if (align_functions
<= 0) align_functions
= 1;
4895 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4897 if (profile_block_flag
== 3)
4899 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4900 profile_block_flag
= 2;
4903 /* Unrolling all loops implies that standard loop unrolling must also
4905 if (flag_unroll_all_loops
)
4906 flag_unroll_loops
= 1;
4907 /* Loop unrolling requires that strength_reduction be on also. Silently
4908 turn on strength reduction here if it isn't already on. Also, the loop
4909 unrolling code assumes that cse will be run after loop, so that must
4910 be turned on also. */
4911 if (flag_unroll_loops
)
4913 flag_strength_reduce
= 1;
4914 flag_rerun_cse_after_loop
= 1;
4917 /* Warn about options that are not supported on this machine. */
4918 #ifndef INSN_SCHEDULING
4919 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4920 warning ("instruction scheduling not supported on this target machine");
4923 if (flag_delayed_branch
)
4924 warning ("this target machine does not have delayed branches");
4927 user_label_prefix
= USER_LABEL_PREFIX
;
4928 if (flag_leading_underscore
!= -1)
4930 /* If the default prefix is more complicated than "" or "_",
4931 issue a warning and ignore this option. */
4932 if (user_label_prefix
[0] == 0 ||
4933 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4935 user_label_prefix
= flag_leading_underscore
? "_" : "";
4938 warning ("-f%sleading-underscore not supported on this target machine",
4939 flag_leading_underscore
? "" : "no-");
4942 /* If we are in verbose mode, write out the version and maybe all the
4943 option flags in use. */
4946 print_version (stderr
, "");
4948 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4951 compile_file (filename
);
4953 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4956 char *lim
= (char *) sbrk (0);
4958 fnotice (stderr
, "Data size %ld.\n", (long) (lim
- (char *) &environ
));
4963 system ("ps -l 1>&2");
4966 #endif /* not USG */
4969 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4972 return (FATAL_EXIT_CODE
);
4974 return (FATAL_EXIT_CODE
);
4975 return (SUCCESS_EXIT_CODE
);
4978 /* Decode -m switches. */
4979 /* Decode the switch -mNAME. */
4982 set_target_switch (name
)
4986 int valid_target_option
= 0;
4988 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4989 if (!strcmp (target_switches
[j
].name
, name
))
4991 if (target_switches
[j
].value
< 0)
4992 target_flags
&= ~-target_switches
[j
].value
;
4994 target_flags
|= target_switches
[j
].value
;
4995 valid_target_option
= 1;
4998 #ifdef TARGET_OPTIONS
4999 if (!valid_target_option
)
5000 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5002 int len
= strlen (target_options
[j
].prefix
);
5003 if (!strncmp (target_options
[j
].prefix
, name
, len
))
5005 *target_options
[j
].variable
= name
+ len
;
5006 valid_target_option
= 1;
5011 if (!valid_target_option
)
5012 error ("Invalid option `%s'", name
);
5015 /* Print version information to FILE.
5016 Each line begins with INDENT (for the case where FILE is the
5017 assembler output file). */
5020 print_version (file
, indent
)
5025 #define __VERSION__ "[?]"
5029 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5031 "%s%s%s version %s (%s) compiled by CC.\n"
5033 , indent
, *indent
!= 0 ? " " : "",
5034 language_string
, version_string
, TARGET_NAME
,
5035 indent
, __VERSION__
);
5038 /* Print an option value and return the adjusted position in the line.
5039 ??? We don't handle error returns from fprintf (disk full); presumably
5040 other code will catch a disk full though. */
5043 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5046 const char *indent
, *sep
, *term
, *type
, *name
;
5048 /* The ultrix fprintf returns 0 on success, so compute the result we want
5049 here since we need it for the following test. */
5050 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5055 fprintf (file
, "%s", term
);
5060 fprintf (file
, "%s", indent
);
5061 pos
= strlen (indent
);
5063 fprintf (file
, "%s%s%s", sep
, type
, name
);
5068 /* Print active target switches to FILE.
5069 POS is the current cursor position and MAX is the size of a "line".
5070 Each line begins with INDENT and ends with TERM.
5071 Each switch is separated from the next by SEP. */
5074 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5077 const char *indent
, *sep
, *term
;
5082 /* Print the options as passed. */
5084 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5085 _("options passed: "), "");
5087 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5091 if (strcmp (*p
, "-o") == 0)
5097 if (strcmp (*p
, "-quiet") == 0)
5099 if (strcmp (*p
, "-version") == 0)
5104 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5107 fprintf (file
, "%s", term
);
5109 /* Print the -f and -m options that have been enabled.
5110 We don't handle language specific options but printing argv
5113 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5114 _("options enabled: "), "");
5116 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5117 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5118 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5119 "-f", f_options
[j
].string
);
5121 /* Print target specific options. */
5123 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5124 if (target_switches
[j
].name
[0] != '\0'
5125 && target_switches
[j
].value
> 0
5126 && ((target_switches
[j
].value
& target_flags
)
5127 == target_switches
[j
].value
))
5129 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5130 "-m", target_switches
[j
].name
);
5133 #ifdef TARGET_OPTIONS
5134 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5135 if (*target_options
[j
].variable
!= NULL
)
5138 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5139 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5140 prefix
, *target_options
[j
].variable
);
5144 fprintf (file
, "%s", term
);
5147 /* Record the beginning of a new source file, named FILENAME. */
5150 debug_start_source_file (filename
)
5151 register const char *filename ATTRIBUTE_UNUSED
;
5153 #ifdef DBX_DEBUGGING_INFO
5154 if (write_symbols
== DBX_DEBUG
)
5155 dbxout_start_new_source_file (filename
);
5157 #ifdef DWARF_DEBUGGING_INFO
5158 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5159 && write_symbols
== DWARF_DEBUG
)
5160 dwarfout_start_new_source_file (filename
);
5161 #endif /* DWARF_DEBUGGING_INFO */
5162 #ifdef DWARF2_DEBUGGING_INFO
5163 if (write_symbols
== DWARF2_DEBUG
)
5164 dwarf2out_start_source_file (filename
);
5165 #endif /* DWARF2_DEBUGGING_INFO */
5166 #ifdef SDB_DEBUGGING_INFO
5167 if (write_symbols
== SDB_DEBUG
)
5168 sdbout_start_new_source_file (filename
);
5172 /* Record the resumption of a source file. LINENO is the line number in
5173 the source file we are returning to. */
5176 debug_end_source_file (lineno
)
5177 register unsigned lineno ATTRIBUTE_UNUSED
;
5179 #ifdef DBX_DEBUGGING_INFO
5180 if (write_symbols
== DBX_DEBUG
)
5181 dbxout_resume_previous_source_file ();
5183 #ifdef DWARF_DEBUGGING_INFO
5184 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5185 && write_symbols
== DWARF_DEBUG
)
5186 dwarfout_resume_previous_source_file (lineno
);
5187 #endif /* DWARF_DEBUGGING_INFO */
5188 #ifdef DWARF2_DEBUGGING_INFO
5189 if (write_symbols
== DWARF2_DEBUG
)
5190 dwarf2out_end_source_file ();
5191 #endif /* DWARF2_DEBUGGING_INFO */
5192 #ifdef SDB_DEBUGGING_INFO
5193 if (write_symbols
== SDB_DEBUG
)
5194 sdbout_resume_previous_source_file ();
5198 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5199 the tail part of the directive line, i.e. the part which is past the
5200 initial whitespace, #, whitespace, directive-name, whitespace part. */
5203 debug_define (lineno
, buffer
)
5204 register unsigned lineno ATTRIBUTE_UNUSED
;
5205 register const char *buffer ATTRIBUTE_UNUSED
;
5207 #ifdef DWARF_DEBUGGING_INFO
5208 if (write_symbols
== DWARF_DEBUG
)
5209 dwarfout_define (lineno
, buffer
);
5210 #endif /* DWARF_DEBUGGING_INFO */
5211 #ifdef DWARF2_DEBUGGING_INFO
5212 if (write_symbols
== DWARF2_DEBUG
)
5213 dwarf2out_define (lineno
, buffer
);
5214 #endif /* DWARF2_DEBUGGING_INFO */
5217 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5218 the tail part of the directive line, i.e. the part which is past the
5219 initial whitespace, #, whitespace, directive-name, whitespace part. */
5222 debug_undef (lineno
, buffer
)
5223 register unsigned lineno ATTRIBUTE_UNUSED
;
5224 register const char *buffer ATTRIBUTE_UNUSED
;
5226 #ifdef DWARF_DEBUGGING_INFO
5227 if (write_symbols
== DWARF_DEBUG
)
5228 dwarfout_undef (lineno
, buffer
);
5229 #endif /* DWARF_DEBUGGING_INFO */
5230 #ifdef DWARF2_DEBUGGING_INFO
5231 if (write_symbols
== DWARF2_DEBUG
)
5232 dwarf2out_undef (lineno
, buffer
);
5233 #endif /* DWARF2_DEBUGGING_INFO */
5236 /* Returns nonzero if it is appropriate not to emit any debugging
5237 information for BLOCK, because it doesn't contain any instructions.
5238 This may not be the case for blocks containing nested functions, since
5239 we may actually call such a function even though the BLOCK information
5243 debug_ignore_block (block
)
5244 tree block ATTRIBUTE_UNUSED
;
5246 /* Never delete the BLOCK for the outermost scope
5247 of the function; we can refer to names from
5248 that scope even if the block notes are messed up. */
5249 if (is_body_block (block
))
5252 #ifdef DWARF2_DEBUGGING_INFO
5253 if (write_symbols
== DWARF2_DEBUG
)
5254 return dwarf2out_ignore_block (block
);