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 generate frame unwind info table when supported. */
728 int flag_unwind_tables
= 0;
730 /* Nonzero means don't place uninitialized global data in common storage
735 /* Nonzero means pretend it is OK to examine bits of target floats,
736 even if that isn't true. The resulting code will have incorrect constants,
737 but the same series of instructions that the native compiler would make. */
739 int flag_pretend_float
;
741 /* Nonzero means change certain warnings into errors.
742 Usually these are warnings about failure to conform to some standard. */
744 int flag_pedantic_errors
= 0;
746 /* flag_schedule_insns means schedule insns within basic blocks (before
748 flag_schedule_insns_after_reload means schedule insns after
751 int flag_schedule_insns
= 0;
752 int flag_schedule_insns_after_reload
= 0;
754 /* The following flags have effect only for scheduling before register
757 flag_schedule_interblock means schedule insns accross basic blocks.
758 flag_schedule_speculative means allow speculative motion of non-load insns.
759 flag_schedule_speculative_load means allow speculative motion of some
761 flag_schedule_speculative_load_dangerous allows speculative motion of more
764 int flag_schedule_interblock
= 1;
765 int flag_schedule_speculative
= 1;
766 int flag_schedule_speculative_load
= 0;
767 int flag_schedule_speculative_load_dangerous
= 0;
769 int flag_single_precision_constant
;
771 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
772 by a cheaper branch on a count register. */
773 int flag_branch_on_count_reg
= 1;
775 /* -finhibit-size-directive inhibits output of .size for ELF.
776 This is used only for compiling crtstuff.c,
777 and it may be extended to other effects
778 needed for crtstuff.c on other systems. */
779 int flag_inhibit_size_directive
= 0;
781 /* -fverbose-asm causes extra commentary information to be produced in
782 the generated assembly code (to make it more readable). This option
783 is generally only of use to those who actually need to read the
784 generated assembly code (perhaps while debugging the compiler itself).
785 -fno-verbose-asm, the default, causes the extra information
786 to be omitted and is useful when comparing two assembler files. */
788 int flag_verbose_asm
= 0;
790 /* -dA causes debug commentary information to be produced in
791 the generated assembly code (to make it more readable). This option
792 is generally only of use to those who actually need to read the
793 generated assembly code (perhaps while debugging the compiler itself).
794 Currently, this switch is only used by dwarfout.c; however, it is intended
795 to be a catchall for printing debug information in the assembler file. */
797 int flag_debug_asm
= 0;
799 /* -dP causes the rtl to be emitted as a comment in assembly. */
801 int flag_dump_rtl_in_asm
= 0;
803 /* -fgnu-linker specifies use of the GNU linker for initializations.
804 (Or, more generally, a linker that handles initializations.)
805 -fno-gnu-linker says that collect2 will be used. */
807 int flag_gnu_linker
= 0;
809 int flag_gnu_linker
= 1;
815 /* Enable dead code elimination. */
818 /* Tag all structures with __attribute__(packed). */
819 int flag_pack_struct
= 0;
821 /* Emit code to check for stack overflow; also may cause large objects
822 to be allocated dynamically. */
823 int flag_stack_check
;
825 /* When non-NULL, indicates that whenever space is allocated on the
826 stack, the resulting stack pointer must not pass this
827 address---that is, for stacks that grow downward, the stack pointer
828 must always be greater than or equal to this address; for stacks
829 that grow upward, the stack pointer must be less than this address.
830 At present, the rtx may be either a REG or a SYMBOL_REF, although
831 the support provided depends on the backend. */
834 /* -fcheck-memory-usage causes extra code to be generated in order to check
835 memory accesses. This is used by a detector of bad memory accesses such
837 int flag_check_memory_usage
= 0;
839 /* -fprefix-function-name causes function name to be prefixed. This
840 can be used with -fcheck-memory-usage to isolate code compiled with
841 -fcheck-memory-usage. */
842 int flag_prefix_function_name
= 0;
844 /* 0 if pointer arguments may alias each other. True in C.
845 1 if pointer arguments may not alias each other but may alias
847 2 if pointer arguments may not alias each other and may not
848 alias global variables. True in Fortran.
849 This defaults to 0 for C. */
850 int flag_argument_noalias
= 0;
852 /* Nonzero if we should do (language-dependent) alias analysis.
853 Typically, this analysis will assume that expressions of certain
854 types do not alias expressions of certain other types. Only used
855 if alias analysis (in general) is enabled. */
856 int flag_strict_aliasing
= 0;
858 /* Instrument functions with calls at entry and exit, for profiling. */
859 int flag_instrument_function_entry_exit
= 0;
861 /* Nonzero means ignore `#ident' directives. 0 means handle them.
862 On SVR4 targets, it also controls whether or not to emit a
863 string identifying the compiler. */
865 int flag_no_ident
= 0;
867 /* This will perform a peephole pass before sched2. */
868 int flag_peephole2
= 0;
870 /* This will try to guess branch probabilities. */
871 int flag_guess_branch_prob
= 0;
873 /* -fbounded-pointers causes gcc to compile pointers as composite
874 objects occupying three words: the pointer value, the base address
875 of the referent object, and the address immediately beyond the end
876 of the referent object. The base and extent allow us to perform
877 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
878 int flag_bounded_pointers
= 0;
880 /* -fcheck-bounds causes gcc to generate array bounds checks.
881 For C, C++: defaults to value of flag_bounded_pointers.
882 For ObjC: defaults to off.
883 For Java: defaults to on.
884 For Fortran: defaults to off.
885 For CHILL: defaults to off. */
886 int flag_bounds_check
= 0;
888 /* If one, renumber instruction UIDs to reduce the number of
889 unused UIDs if there are a lot of instructions. If greater than
890 one, unconditionally renumber instruction UIDs. */
891 int flag_renumber_insns
= 1;
893 /* Values of the -falign-* flags: how much to align labels in code.
894 0 means `use default', 1 means `don't align'.
895 For each variable, there is an _log variant which is the power
896 of two not less than the variable, for .align output. */
903 int align_labels_log
;
905 int align_functions_log
;
907 /* Table of supported debugging formats. */
911 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
912 constant expression, we use NO_DEBUG in its place. */
913 enum debug_info_type debug_type
;
914 int use_extensions_p
;
915 const char *description
;
919 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
920 "Generate default debug format output" },
921 { "gdb", NO_DEBUG
, 1, "Generate default extended debug format output" },
922 #ifdef DBX_DEBUGGING_INFO
923 { "stabs", DBX_DEBUG
, 0, "Generate STABS format debug output" },
924 { "stabs+", DBX_DEBUG
, 1, "Generate extended STABS format debug output" },
926 #ifdef DWARF_DEBUGGING_INFO
927 { "dwarf", DWARF_DEBUG
, 0, "Generate DWARF-1 format debug output"},
928 { "dwarf+", DWARF_DEBUG
, 1,
929 "Generated extended DWARF-1 format debug output" },
931 #ifdef DWARF2_DEBUGGING_INFO
932 { "dwarf-2", DWARF2_DEBUG
, 0, "Enable DWARF-2 debug output" },
934 #ifdef XCOFF_DEBUGGING_INFO
935 { "xcoff", XCOFF_DEBUG
, 0, "Generate XCOFF format debug output" },
936 { "xcoff+", XCOFF_DEBUG
, 1, "Generate extended XCOFF format debug output" },
938 #ifdef SDB_DEBUGGING_INFO
939 { "coff", SDB_DEBUG
, 0, "Generate COFF format debug output" },
949 const char *description
;
951 lang_independent_options
;
955 /* Add or remove a leading underscore from user symbols. */
956 int flag_leading_underscore
= -1;
958 /* The user symbol prefix after having resolved same. */
959 const char *user_label_prefix
;
961 static const param_info lang_independent_params
[] = {
962 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
964 #include "params.def"
969 /* A default for same. */
970 #ifndef USER_LABEL_PREFIX
971 #define USER_LABEL_PREFIX ""
974 /* Table of language-independent -f options.
975 STRING is the option name. VARIABLE is the address of the variable.
976 ON_VALUE is the value to store in VARIABLE
977 if `-fSTRING' is seen as an option.
978 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
980 lang_independent_options f_options
[] =
982 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
983 "Perform DWARF2 duplicate elimination"},
984 {"float-store", &flag_float_store
, 1,
985 "Do not store floats in registers" },
986 {"volatile", &flag_volatile
, 1,
987 "Consider all mem refs through pointers as volatile"},
988 {"volatile-global", &flag_volatile_global
, 1,
989 "Consider all mem refs to global data to be volatile" },
990 {"volatile-static", &flag_volatile_static
, 1,
991 "Consider all mem refs to static data to be volatile" },
992 {"defer-pop", &flag_defer_pop
, 1,
993 "Defer popping functions args from stack until later" },
994 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
995 "When possible do not generate stack frames"},
996 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
997 "Optimize sibling and tail recursive calls" },
998 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
999 "When running CSE, follow jumps to their targets" },
1000 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1001 "When running CSE, follow conditional jumps" },
1002 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1003 "Perform a number of minor, expensive optimisations" },
1004 {"thread-jumps", &flag_thread_jumps
, 1,
1005 "Perform jump threading optimisations"},
1006 {"strength-reduce", &flag_strength_reduce
, 1,
1007 "Perform strength reduction optimisations" },
1008 {"unroll-loops", &flag_unroll_loops
, 1,
1009 "Perform loop unrolling when iteration count is known" },
1010 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1011 "Perform loop unrolling for all loops" },
1012 {"move-all-movables", &flag_move_all_movables
, 1,
1013 "Force all loop invariant computations out of loops" },
1014 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1015 "Strength reduce all loop general induction variables" },
1016 {"writable-strings", &flag_writable_strings
, 1,
1017 "Store strings in writable data section" },
1018 {"peephole", &flag_no_peephole
, 0,
1019 "Enable machine specific peephole optimisations" },
1020 {"force-mem", &flag_force_mem
, 1,
1021 "Copy memory operands into registers before using" },
1022 {"force-addr", &flag_force_addr
, 1,
1023 "Copy memory address constants into regs before using" },
1024 {"function-cse", &flag_no_function_cse
, 0,
1025 "Allow function addresses to be held in registers" },
1026 {"inline-functions", &flag_inline_functions
, 1,
1027 "Integrate simple functions into their callers" },
1028 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1029 "Generate code for funcs even if they are fully inlined" },
1030 {"inline", &flag_no_inline
, 0,
1031 "Pay attention to the 'inline' keyword"},
1032 {"keep-static-consts", &flag_keep_static_consts
, 1,
1033 "Emit static const variables even if they are not used" },
1034 {"syntax-only", &flag_syntax_only
, 1,
1035 "Check for syntax errors, then stop" },
1036 {"shared-data", &flag_shared_data
, 1,
1037 "Mark data as shared rather than private" },
1038 {"caller-saves", &flag_caller_saves
, 1,
1039 "Enable saving registers around function calls" },
1040 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1041 "Return 'short' aggregates in memory, not registers" },
1042 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1043 "Return 'short' aggregates in registers" },
1044 {"delayed-branch", &flag_delayed_branch
, 1,
1045 "Attempt to fill delay slots of branch instructions" },
1046 {"gcse", &flag_gcse
, 1,
1047 "Perform the global common subexpression elimination" },
1048 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1049 "Run CSE pass after loop optimisations"},
1050 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1051 "Run the loop optimiser twice"},
1052 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1053 "Delete useless null pointer checks" },
1054 {"pretend-float", &flag_pretend_float
, 1,
1055 "Pretend that host and target use the same FP format"},
1056 {"schedule-insns", &flag_schedule_insns
, 1,
1057 "Reschedule instructions before register allocation"},
1058 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1059 "Reschedule instructions after register allocation"},
1060 {"sched-interblock",&flag_schedule_interblock
, 1,
1061 "Enable scheduling across basic blocks" },
1062 {"sched-spec",&flag_schedule_speculative
, 1,
1063 "Allow speculative motion of non-loads" },
1064 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1065 "Allow speculative motion of some loads" },
1066 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1067 "Allow speculative motion of more loads" },
1068 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1069 "Replace add,compare,branch with branch on count reg"},
1070 {"pic", &flag_pic
, 1,
1071 "Generate position independent code, if possible"},
1072 {"PIC", &flag_pic
, 2, ""},
1073 {"exceptions", &flag_exceptions
, 1,
1074 "Enable exception handling" },
1075 {"unwind-tables", &flag_unwind_tables
, 1,
1076 "Just generate unwind tables for exception handling" },
1077 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1078 "Support synchronous non-call exceptions" },
1079 {"profile-arcs", &profile_arc_flag
, 1,
1080 "Insert arc based program profiling code" },
1081 {"test-coverage", &flag_test_coverage
, 1,
1082 "Create data files needed by gcov" },
1083 {"branch-probabilities", &flag_branch_probabilities
, 1,
1084 "Use profiling information for branch probabilities" },
1085 {"reorder-blocks", &flag_reorder_blocks
, 1,
1086 "Reorder basic blocks to improve code placement" },
1087 {"rename-registers", &flag_rename_registers
, 1,
1088 "Do the register renaming optimization pass"},
1089 {"common", &flag_no_common
, 0,
1090 "Do not put unitialised globals in the common section" },
1091 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1092 "Do not generate .size directives" },
1093 {"function-sections", &flag_function_sections
, 1,
1094 "place each function into its own section" },
1095 {"data-sections", &flag_data_sections
, 1,
1096 "place data items into their own section" },
1097 {"verbose-asm", &flag_verbose_asm
, 1,
1098 "Add extra commentry to assembler output"},
1099 {"gnu-linker", &flag_gnu_linker
, 1,
1100 "Output GNU ld formatted global initialisers"},
1101 {"regmove", &flag_regmove
, 1,
1102 "Enables a register move optimisation"},
1103 {"optimize-register-move", &flag_regmove
, 1,
1104 "Do the full regmove optimization pass"},
1105 {"pack-struct", &flag_pack_struct
, 1,
1106 "Pack structure members together without holes" },
1107 {"stack-check", &flag_stack_check
, 1,
1108 "Insert stack checking code into the program" },
1109 {"argument-alias", &flag_argument_noalias
, 0,
1110 "Specify that arguments may alias each other & globals"},
1111 {"argument-noalias", &flag_argument_noalias
, 1,
1112 "Assume arguments may alias globals but not each other"},
1113 {"argument-noalias-global", &flag_argument_noalias
, 2,
1114 "Assume arguments do not alias each other or globals" },
1115 {"strict-aliasing", &flag_strict_aliasing
, 1,
1116 "Assume strict aliasing rules apply" },
1117 {"align-loops", &align_loops
, 0,
1118 "Align the start of loops" },
1119 {"align-jumps", &align_jumps
, 0,
1120 "Align labels which are only reached by jumping" },
1121 {"align-labels", &align_labels
, 0,
1122 "Align all labels" },
1123 {"align-functions", &align_functions
, 0,
1124 "Align the start of functions" },
1125 {"check-memory-usage", &flag_check_memory_usage
, 1,
1126 "Generate code to check every memory access" },
1127 {"prefix-function-name", &flag_prefix_function_name
, 1,
1128 "Add a prefix to all function names" },
1129 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1130 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1131 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1132 "Instrument function entry/exit with profiling calls"},
1133 {"ssa", &flag_ssa
, 1,
1134 "Enable SSA optimizations" },
1135 {"dce", &flag_dce
, 1,
1136 "Enable dead code elimination" },
1137 {"leading-underscore", &flag_leading_underscore
, 1,
1138 "External symbols have a leading underscore" },
1139 {"ident", &flag_no_ident
, 0,
1140 "Process #ident directives"},
1141 { "peephole2", &flag_peephole2
, 1,
1142 "Enables an rtl peephole pass run before sched2" },
1143 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1144 "Enables guessing of branch probabilities" },
1145 {"math-errno", &flag_errno_math
, 1,
1146 "Set errno after built-in math functions"},
1147 {"trapping-math", &flag_trapping_math
, 1,
1148 "Floating-point operations can trap"},
1149 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1150 "Allow math optimizations that may violate IEEE or ANSI standards"},
1151 {"bounded-pointers", &flag_bounded_pointers
, 1,
1152 "Compile pointers as triples: value, base & end" },
1153 {"bounds-check", &flag_bounds_check
, 1,
1154 "Generate code to check bounds before dereferencing pointers and arrays" },
1155 {"single-precision-constant", &flag_single_precision_constant
, 1,
1156 "Convert floating point constant to single precision constant"},
1157 {"time-report", &time_report
, 1,
1158 "Report time taken by each compiler pass at end of run"},
1159 {"mem-report", &mem_report
, 1,
1160 "Report on permanent memory allocation at end of run"},
1161 { "trapv", &flag_trapv
, 1,
1162 "Trap for signed overflow in addition / subtraction / multiplication." },
1165 /* Table of language-specific options. */
1167 static struct lang_opt
1170 const char *description
;
1172 documented_lang_options
[] =
1174 /* In order not to overload the --help output, the convention
1175 used here is to only describe those options which are not
1176 enabled by default. */
1178 { "-ansi", "Compile just for ISO C89" },
1179 { "-fallow-single-precision",
1180 "Do not promote floats to double if using -traditional" },
1181 { "-std= ", "Determine language standard"},
1183 { "-fsigned-bitfields", "" },
1184 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1185 { "-fno-signed-bitfields", "" },
1186 { "-fno-unsigned-bitfields","" },
1187 { "-fsigned-char", "Make 'char' be signed by default"},
1188 { "-funsigned-char", "Make 'char' be unsigned by default"},
1189 { "-fno-signed-char", "" },
1190 { "-fno-unsigned-char", "" },
1192 { "-ftraditional", "" },
1193 { "-traditional", "Attempt to support traditional K&R style C"},
1194 { "-fnotraditional", "" },
1195 { "-fno-traditional", "" },
1198 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1199 { "-fbuiltin", "" },
1200 { "-fno-builtin", "Do not recognise any built in functions" },
1201 { "-fhosted", "Assume normal C execution environment" },
1202 { "-fno-hosted", "" },
1204 "Assume that standard libraries & main might not exist" },
1205 { "-fno-freestanding", "" },
1206 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1207 { "-fno-cond-mismatch", "" },
1208 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1209 { "-fno-dollars-in-identifiers", "" },
1210 { "-fpreprocessed", "" },
1211 { "-fno-preprocessed", "" },
1212 { "-fshort-double", "Use the same size for double as for float" },
1213 { "-fno-short-double", "" },
1214 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1215 { "-fno-short-enums", "" },
1216 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1217 { "-fno-short-wchar", "" },
1219 { "-Wall", "Enable most warning messages" },
1220 { "-Wbad-function-cast",
1221 "Warn about casting functions to incompatible types" },
1222 { "-Wno-bad-function-cast", "" },
1223 { "-Wno-missing-noreturn", "" },
1224 { "-Wmissing-format-attribute",
1225 "Warn about functions which might be candidates for format attributes" },
1226 { "-Wno-missing-format-attribute", "" },
1227 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1228 { "-Wno-cast-qual", "" },
1229 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1230 { "-Wno-char-subscripts", "" },
1231 { "-Wcomment", "Warn if nested comments are detected" },
1232 { "-Wno-comment", "" },
1233 { "-Wcomments", "Warn if nested comments are detected" },
1234 { "-Wno-comments", "" },
1235 { "-Wconversion", "Warn about possibly confusing type conversions" },
1236 { "-Wno-conversion", "" },
1237 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1238 { "-Wno-format", "" },
1239 { "-Wformat-y2k", "" },
1240 { "-Wno-format-y2k",
1241 "Don't warn about strftime formats yielding 2 digit years" },
1242 { "-Wformat-extra-args", "" },
1243 { "-Wno-format-extra-args",
1244 "Don't warn about too many arguments to format functions" },
1245 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1246 { "-Wno-format-nonliteral", "" },
1247 { "-Wformat-security",
1248 "Warn about possible security problems with format functions" },
1249 { "-Wno-format-security", "" },
1250 { "-Wimplicit-function-declaration",
1251 "Warn about implicit function declarations" },
1252 { "-Wno-implicit-function-declaration", "" },
1253 { "-Werror-implicit-function-declaration", "" },
1254 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1255 { "-Wno-implicit-int", "" },
1256 { "-Wimplicit", "" },
1257 { "-Wno-implicit", "" },
1258 { "-Wimport", "Warn about the use of the #import directive" },
1259 { "-Wno-import", "" },
1260 { "-Wlong-long","" },
1261 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1262 { "-Wmain", "Warn about suspicious declarations of main" },
1263 { "-Wno-main", "" },
1264 { "-Wmissing-braces",
1265 "Warn about possibly missing braces around initialisers" },
1266 { "-Wno-missing-braces", "" },
1267 { "-Wmissing-declarations",
1268 "Warn about global funcs without previous declarations"},
1269 { "-Wno-missing-declarations", "" },
1270 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1271 { "-Wno-missing-prototypes", "" },
1272 { "-Wmultichar", "Warn about use of multicharacter literals"},
1273 { "-Wno-multichar", "" },
1274 { "-Wnested-externs", "Warn about externs not at file scope level" },
1275 { "-Wno-nested-externs", "" },
1276 { "-Wparentheses", "Warn about possible missing parentheses" },
1277 { "-Wno-parentheses", "" },
1278 { "-Wsequence-point",
1279 "Warn about possible violations of sequence point rules" },
1280 { "-Wno-sequence-point", "" },
1281 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1282 { "-Wno-pointer-arith", "" },
1283 { "-Wredundant-decls",
1284 "Warn about multiple declarations of the same object" },
1285 { "-Wno-redundant-decls", "" },
1286 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1287 { "-Wno-sign-compare", "" },
1288 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1289 { "-Wno-float-equal", "" },
1290 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1291 { "-Wno-unknown-pragmas", "" },
1292 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1293 { "-Wno-strict-prototypes", "" },
1294 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1295 { "-Wno-traditional", "" },
1296 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1297 { "-Wno-trigraphs", "" },
1299 { "-Wno-undef", "" },
1300 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1301 { "-Wno-write-strings", "" },
1303 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1305 #include "options.h"
1309 /* Here is a table, controlled by the tm.h file, listing each -m switch
1310 and which bits in `target_switches' it should set or clear.
1311 If VALUE is positive, it is bits to set.
1312 If VALUE is negative, -VALUE is bits to clear.
1313 (The sign bit is not used so there is no confusion.) */
1319 const char *description
;
1321 target_switches
[] = TARGET_SWITCHES
;
1323 /* This table is similar, but allows the switch to have a value. */
1325 #ifdef TARGET_OPTIONS
1329 const char **variable
;
1330 const char *description
;
1332 target_options
[] = TARGET_OPTIONS
;
1335 /* Options controlling warnings. */
1337 /* Don't print warning messages. -w. */
1339 int inhibit_warnings
= 0;
1341 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1343 int warn_system_headers
= 0;
1345 /* Print various extra warnings. -W. */
1347 int extra_warnings
= 0;
1349 /* Treat warnings as errors. -Werror. */
1351 int warnings_are_errors
= 0;
1353 /* Nonzero to warn about unused variables, functions et.al. */
1355 int warn_unused_function
;
1356 int warn_unused_label
;
1357 int warn_unused_parameter
;
1358 int warn_unused_variable
;
1359 int warn_unused_value
;
1362 set_Wunused (setting
)
1365 warn_unused_function
= setting
;
1366 warn_unused_label
= setting
;
1367 /* Unused function parameter warnings are reported when either ``-W
1368 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1369 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1371 warn_unused_parameter
= 0;
1372 else if (!warn_unused_parameter
)
1373 warn_unused_parameter
= -1;
1374 warn_unused_variable
= setting
;
1375 warn_unused_value
= setting
;
1378 /* Nonzero to warn about code which is never reached. */
1380 int warn_notreached
;
1382 /* Nonzero to warn about variables used before they are initialized. */
1384 int warn_uninitialized
;
1386 /* Nonzero means warn about all declarations which shadow others. */
1390 /* Warn if a switch on an enum fails to have a case for every enum value. */
1394 /* Nonzero means warn about function definitions that default the return type
1395 or that use a null return and have a return-type other than void. */
1397 int warn_return_type
;
1399 /* Nonzero means warn about pointer casts that increase the required
1400 alignment of the target type (and might therefore lead to a crash
1401 due to a misaligned access). */
1403 int warn_cast_align
;
1405 /* Nonzero means warn about any identifiers that match in the first N
1406 characters. The value N is in `id_clash_len'. */
1411 /* Nonzero means warn about any objects definitions whose size is larger
1412 than N bytes. Also want about function definitions whose returned
1413 values are larger than N bytes. The value N is in `larger_than_size'. */
1415 int warn_larger_than
;
1416 HOST_WIDE_INT larger_than_size
;
1418 /* Nonzero means warn if inline function is too large. */
1422 /* Warn if a function returns an aggregate,
1423 since there are often incompatible calling conventions for doing this. */
1425 int warn_aggregate_return
;
1427 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1431 /* Warn when gcc pads a structure to an alignment boundary. */
1435 /* Warn when an optimization pass is disabled. */
1437 int warn_disabled_optimization
;
1439 /* Warn about functions which might be candidates for attribute noreturn. */
1441 int warn_missing_noreturn
;
1443 /* Likewise for -W. */
1445 lang_independent_options W_options
[] =
1447 {"unused-function", &warn_unused_function
, 1, "Warn when a function is unused" },
1448 {"unused-label", &warn_unused_label
, 1, "Warn when a label is unused" },
1449 {"unused-parameter", &warn_unused_parameter
, 1, "Warn when a function parameter is unused" },
1450 {"unused-variable", &warn_unused_variable
, 1, "Warn when a variable is unused" },
1451 {"unused-value", &warn_unused_value
, 1, "Warn when an expression value is unused" },
1452 {"system-headers", &warn_system_headers
, 1, "Do not suppress warnings from system headers"},
1453 {"error", &warnings_are_errors
, 1, ""},
1454 {"shadow", &warn_shadow
, 1, "Warn when one local variable shadows another" },
1455 {"switch", &warn_switch
, 1,
1456 "Warn about enumerated switches missing a specific case" },
1457 {"aggregate-return", &warn_aggregate_return
, 1,
1458 "Warn about returning structures, unions or arrays" },
1459 {"cast-align", &warn_cast_align
, 1,
1460 "Warn about pointer casts which increase alignment" },
1461 {"unreachable-code", &warn_notreached
, 1,
1462 "Warn about code that will never be executed" },
1463 {"uninitialized", &warn_uninitialized
, 1,
1464 "Warn about unitialized automatic variables"},
1465 {"inline", &warn_inline
, 1,
1466 "Warn when an inlined function cannot be inlined"},
1467 {"packed", &warn_packed
, 1,
1468 "Warn when the packed attribute has no effect on struct layout"},
1469 {"padded", &warn_padded
, 1,
1470 "Warn when padding is required to align struct members"},
1471 {"disabled-optimization", &warn_disabled_optimization
, 1,
1472 "Warn when an optimization pass is disabled"},
1473 {"missing-noreturn", &warn_missing_noreturn
, 1,
1474 "Warn about functions which might be candidates for attribute noreturn"}
1477 /* The following routines are useful in setting all the flags that
1478 -ffast-math and -fno-fast-math imply. */
1481 set_fast_math_flags ()
1483 flag_trapping_math
= 0;
1484 flag_unsafe_math_optimizations
= 1;
1485 flag_errno_math
= 0;
1489 set_no_fast_math_flags ()
1491 flag_trapping_math
= 1;
1492 flag_unsafe_math_optimizations
= 0;
1493 flag_errno_math
= 1;
1497 /* Output files for assembler code (real compiler output)
1498 and debugging dumps. */
1501 FILE *aux_info_file
;
1502 FILE *rtl_dump_file
= NULL
;
1504 /* Decode the string P as an integral parameter.
1505 If the string is indeed an integer return its numeric value else
1506 issue an Invalid Option error for the option PNAME and return DEFVAL.
1507 If PNAME is zero just return DEFVAL, do not call error. */
1510 read_integral_parameter (p
, pname
, defval
)
1515 const char *endp
= p
;
1519 if (*endp
>= '0' && *endp
<= '9')
1528 error ("Invalid option `%s'", pname
);
1536 /* This is the default decl_printable_name function. */
1539 decl_name (decl
, verbosity
)
1541 int verbosity ATTRIBUTE_UNUSED
;
1543 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1547 /* This calls abort and is used to avoid problems when abort if a macro.
1548 It is used when we need to pass the address of abort. */
1556 /* When `malloc.c' is compiled with `rcheck' defined,
1557 it calls this function to report clobberage. */
1561 const char *s ATTRIBUTE_UNUSED
;
1566 /* Return the logarithm of X, base 2, considering X unsigned,
1567 if X is a power of 2. Otherwise, returns -1.
1569 This should be used via the `exact_log2' macro. */
1573 register unsigned HOST_WIDE_INT x
;
1575 register int log
= 0;
1576 /* Test for 0 or a power of 2. */
1577 if (x
== 0 || x
!= (x
& -x
))
1579 while ((x
>>= 1) != 0)
1584 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1585 If X is 0, return -1.
1587 This should be used via the floor_log2 macro. */
1591 register unsigned HOST_WIDE_INT x
;
1593 register int log
= -1;
1600 /* Return the approximate positive square root of a number N. This is for
1601 statistical reports, not code generation. */
1616 d
= (s
* s
- x
) / (2 * s
);
1623 static int float_handler_set
;
1625 jmp_buf float_handler
;
1627 /* Signals actually come here. */
1630 float_signal (signo
)
1631 /* If this is missing, some compilers complain. */
1632 int signo ATTRIBUTE_UNUSED
;
1634 if (float_handled
== 0)
1635 crash_signal (signo
);
1636 #if defined (USG) || defined (hpux)
1637 /* Re-enable the signal catcher. */
1638 signal (SIGFPE
, float_signal
);
1641 signal (SIGFPE
, float_signal
);
1642 longjmp (float_handler
, 1);
1645 /* Specify where to longjmp to when a floating arithmetic error happens.
1646 If HANDLER is 0, it means don't handle the errors any more. */
1649 set_float_handler (handler
)
1652 float_handled
= (handler
!= 0);
1654 memcpy (float_handler
, handler
, sizeof (float_handler
));
1656 if (float_handled
&& ! float_handler_set
)
1658 signal (SIGFPE
, float_signal
);
1659 float_handler_set
= 1;
1663 /* This is a wrapper function for code which might elicit an
1664 arithmetic exception. That code should be passed in as a function
1665 pointer FN, and one argument DATA. DATA is usually a struct which
1666 contains the real input and output for function FN. This function
1667 returns 0 (failure) if longjmp was called (i.e. an exception
1668 occured.) It returns 1 (success) otherwise. */
1671 do_float_handler (fn
, data
)
1672 void (*fn
) PARAMS ((PTR
));
1679 /* We got here via longjmp () caused by an exception in function
1681 set_float_handler (NULL
);
1685 set_float_handler (buf
);
1687 set_float_handler (NULL
);
1691 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1692 into ICE messages, which is much more user friendly. */
1695 crash_signal (signo
)
1698 internal_error ("Internal error: %s", strsignal (signo
));
1701 /* Strip off a legitimate source ending from the input string NAME of
1702 length LEN. Rather than having to know the names used by all of
1703 our front ends, we strip off an ending of a period followed by
1704 up to five characters. (Java uses ".class".) */
1707 strip_off_ending (name
, len
)
1712 for (i
= 2; i
< 6 && len
> i
; i
++)
1714 if (name
[len
- i
] == '.')
1716 name
[len
- i
] = '\0';
1722 /* Output a quoted string. */
1725 output_quoted_string (asm_file
, string
)
1729 #ifdef OUTPUT_QUOTED_STRING
1730 OUTPUT_QUOTED_STRING (asm_file
, string
);
1734 putc ('\"', asm_file
);
1735 while ((c
= *string
++) != 0)
1737 if (c
== '\"' || c
== '\\')
1738 putc ('\\', asm_file
);
1741 putc ('\"', asm_file
);
1745 /* Output a file name in the form wanted by System V. */
1748 output_file_directive (asm_file
, input_name
)
1750 const char *input_name
;
1752 int len
= strlen (input_name
);
1753 const char *na
= input_name
+ len
;
1755 /* NA gets INPUT_NAME sans directory names. */
1756 while (na
> input_name
)
1758 if (IS_DIR_SEPARATOR (na
[-1]))
1763 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1764 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1766 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1767 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1769 fprintf (asm_file
, "\t.file\t");
1770 output_quoted_string (asm_file
, na
);
1771 fputc ('\n', asm_file
);
1776 #ifdef ASM_IDENTIFY_LANGUAGE
1777 /* Routine to build language identifier for object file. */
1780 output_lang_identify (asm_out_file
)
1783 int len
= strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1784 char *s
= (char *) alloca (len
);
1786 sprintf (s
, "__gnu_compiled_%s", lang_identify ());
1787 ASM_OUTPUT_LABEL (asm_out_file
, s
);
1791 /* Routine to open a dump file. Return true if the dump file is enabled. */
1794 open_dump_file (index
, decl
)
1795 enum dump_file_index index
;
1799 const char *open_arg
;
1802 if (! dump_file
[index
].enabled
)
1805 timevar_push (TV_DUMP
);
1806 if (rtl_dump_file
!= NULL
)
1807 fclose (rtl_dump_file
);
1809 sprintf (seq
, ".%02d.", index
);
1811 if (! dump_file
[index
].initialized
)
1813 /* If we've not initialized the files, do so now. */
1814 if (graph_dump_format
!= no_graph
1815 && dump_file
[index
].graph_dump_p
)
1817 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1818 clean_graph_dump_file (dump_base_name
, dump_name
);
1821 dump_file
[index
].initialized
= 1;
1827 dump_name
= concat (dump_base_name
, seq
,
1828 dump_file
[index
].extension
, NULL
);
1830 rtl_dump_file
= fopen (dump_name
, open_arg
);
1831 if (rtl_dump_file
== NULL
)
1832 fatal_io_error ("can't open %s", dump_name
);
1837 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1838 decl_printable_name (decl
, 2));
1840 timevar_pop (TV_DUMP
);
1844 /* Routine to close a dump file. */
1847 close_dump_file (index
, func
, insns
)
1848 enum dump_file_index index
;
1849 void (*func
) PARAMS ((FILE *, rtx
));
1852 if (! rtl_dump_file
)
1855 timevar_push (TV_DUMP
);
1857 && graph_dump_format
!= no_graph
1858 && dump_file
[index
].graph_dump_p
)
1863 sprintf (seq
, ".%02d.", index
);
1864 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1865 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1870 func (rtl_dump_file
, insns
);
1872 fflush (rtl_dump_file
);
1873 fclose (rtl_dump_file
);
1875 rtl_dump_file
= NULL
;
1876 timevar_pop (TV_DUMP
);
1879 /* Do any final processing required for the declarations in VEC, of
1880 which there are LEN. We write out inline functions and variables
1881 that have been deferred until this point, but which are required.
1882 Returns non-zero if anything was put out. */
1885 wrapup_global_declarations (vec
, len
)
1892 int output_something
= 0;
1894 for (i
= 0; i
< len
; i
++)
1898 /* We're not deferring this any longer. */
1899 DECL_DEFER_OUTPUT (decl
) = 0;
1901 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1902 && incomplete_decl_finalize_hook
!= 0)
1903 (*incomplete_decl_finalize_hook
) (decl
);
1906 /* Now emit any global variables or functions that we have been
1907 putting off. We need to loop in case one of the things emitted
1908 here references another one which comes earlier in the list. */
1912 for (i
= 0; i
< len
; i
++)
1916 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1919 /* Don't write out static consts, unless we still need them.
1921 We also keep static consts if not optimizing (for debugging),
1922 unless the user specified -fno-keep-static-consts.
1923 ??? They might be better written into the debug information.
1924 This is possible when using DWARF.
1926 A language processor that wants static constants to be always
1927 written out (even if it is not used) is responsible for
1928 calling rest_of_decl_compilation itself. E.g. the C front-end
1929 calls rest_of_decl_compilation from finish_decl.
1930 One motivation for this is that is conventional in some
1931 environments to write things like:
1932 static const char rcsid[] = "... version string ...";
1933 intending to force the string to be in the executable.
1935 A language processor that would prefer to have unneeded
1936 static constants "optimized away" would just defer writing
1937 them out until here. E.g. C++ does this, because static
1938 constants are often defined in header files.
1940 ??? A tempting alternative (for both C and C++) would be
1941 to force a constant to be written if and only if it is
1942 defined in a main file, as opposed to an include file. */
1944 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1945 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1946 && !DECL_COMDAT (decl
))
1948 && flag_keep_static_consts
1949 && !DECL_ARTIFICIAL (decl
))
1950 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1953 rest_of_decl_compilation (decl
, NULL_PTR
, 1, 1);
1956 if (TREE_CODE (decl
) == FUNCTION_DECL
1957 && DECL_INITIAL (decl
) != 0
1958 && DECL_SAVED_INSNS (decl
) != 0
1959 && (flag_keep_inline_functions
1960 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1961 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1964 output_inline_function (decl
);
1969 output_something
= 1;
1973 return output_something
;
1976 /* Issue appropriate warnings for the global declarations in VEC (of
1977 which there are LEN). Output debugging information for them. */
1980 check_global_declarations (vec
, len
)
1987 for (i
= 0; i
< len
; i
++)
1991 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1992 && ! TREE_ASM_WRITTEN (decl
))
1993 /* Cancel the RTL for this decl so that, if debugging info
1994 output for global variables is still to come,
1995 this one will be omitted. */
1996 SET_DECL_RTL (decl
, NULL_RTX
);
1998 /* Warn about any function
1999 declared static but not defined.
2000 We don't warn about variables,
2001 because many programs have static variables
2002 that exist only to get some text into the object file. */
2003 if (TREE_CODE (decl
) == FUNCTION_DECL
2004 && (warn_unused_function
2005 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2006 && DECL_INITIAL (decl
) == 0
2007 && DECL_EXTERNAL (decl
)
2008 && ! DECL_ARTIFICIAL (decl
)
2009 && ! TREE_PUBLIC (decl
))
2011 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2012 pedwarn_with_decl (decl
,
2013 "`%s' used but never defined");
2015 warning_with_decl (decl
,
2016 "`%s' declared `static' but never defined");
2017 /* This symbol is effectively an "extern" declaration now. */
2018 TREE_PUBLIC (decl
) = 1;
2019 assemble_external (decl
);
2022 /* Warn about static fns or vars defined but not used,
2023 but not about inline functions or static consts
2024 since defining those in header files is normal practice. */
2025 if (((warn_unused_function
2026 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2027 || (warn_unused_variable
2028 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2029 && ! DECL_IN_SYSTEM_HEADER (decl
)
2030 && ! DECL_EXTERNAL (decl
)
2031 && ! TREE_PUBLIC (decl
)
2032 && ! TREE_USED (decl
)
2033 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2034 /* The TREE_USED bit for file-scope decls
2035 is kept in the identifier, to handle multiple
2036 external decls in different scopes. */
2037 && ! TREE_USED (DECL_NAME (decl
)))
2038 warning_with_decl (decl
, "`%s' defined but not used");
2040 timevar_push (TV_SYMOUT
);
2041 #ifdef SDB_DEBUGGING_INFO
2042 /* The COFF linker can move initialized global vars to the end.
2043 And that can screw up the symbol ordering.
2044 By putting the symbols in that order to begin with,
2045 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2046 if (write_symbols
== SDB_DEBUG
&& TREE_CODE (decl
) == VAR_DECL
2047 && TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)
2048 && ! DECL_EXTERNAL (decl
)
2049 && DECL_RTL (decl
) != 0)
2050 sdbout_symbol (decl
, 0);
2052 /* Output COFF information for non-global
2053 file-scope initialized variables. */
2054 if (write_symbols
== SDB_DEBUG
2055 && TREE_CODE (decl
) == VAR_DECL
2056 && DECL_INITIAL (decl
)
2057 && ! DECL_EXTERNAL (decl
)
2058 && DECL_RTL (decl
) != 0
2059 && GET_CODE (DECL_RTL (decl
)) == MEM
)
2060 sdbout_toplevel_data (decl
);
2061 #endif /* SDB_DEBUGGING_INFO */
2062 #ifdef DWARF_DEBUGGING_INFO
2063 /* Output DWARF information for file-scope tentative data object
2064 declarations, file-scope (extern) function declarations (which
2065 had no corresponding body) and file-scope tagged type declarations
2066 and definitions which have not yet been forced out. */
2068 if (write_symbols
== DWARF_DEBUG
2069 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2070 dwarfout_file_scope_decl (decl
, 1);
2072 #ifdef DWARF2_DEBUGGING_INFO
2073 /* Output DWARF2 information for file-scope tentative data object
2074 declarations, file-scope (extern) function declarations (which
2075 had no corresponding body) and file-scope tagged type declarations
2076 and definitions which have not yet been forced out. */
2078 if (write_symbols
== DWARF2_DEBUG
2079 && (TREE_CODE (decl
) != FUNCTION_DECL
|| !DECL_INITIAL (decl
)))
2080 dwarf2out_decl (decl
);
2082 timevar_pop (TV_SYMOUT
);
2086 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2087 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2088 INPUT_FILENAME and LINENO accordingly. */
2091 push_srcloc (file
, line
)
2095 struct file_stack
*fs
;
2097 if (input_file_stack
)
2099 input_file_stack
->name
= input_filename
;
2100 input_file_stack
->line
= lineno
;
2103 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2104 fs
->name
= input_filename
= file
;
2105 fs
->line
= lineno
= line
;
2106 fs
->indent_level
= 0;
2107 fs
->next
= input_file_stack
;
2108 input_file_stack
= fs
;
2109 input_file_stack_tick
++;
2112 /* Pop the top entry off the stack of presently open source files.
2113 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2119 struct file_stack
*fs
;
2121 fs
= input_file_stack
;
2122 input_file_stack
= fs
->next
;
2124 input_file_stack_tick
++;
2125 /* The initial source file is never popped. */
2126 if (!input_file_stack
)
2128 input_filename
= input_file_stack
->name
;
2129 lineno
= input_file_stack
->line
;
2132 /* Compile an entire file of output from cpp, named NAME.
2133 Write a file of assembly output and various debugging dumps. */
2141 int name_specified
= name
!= 0;
2143 if (dump_base_name
== 0)
2144 dump_base_name
= name
? name
: "gccdump";
2149 /* Start timing total execution time. */
2152 timevar_start (TV_TOTAL
);
2154 /* Initialize data in various passes. */
2157 name
= init_parse (name
);
2158 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2159 || debug_info_level
== DINFO_LEVEL_VERBOSE
2160 || flag_test_coverage
2161 || warn_notreached
);
2164 init_decl_processing ();
2170 init_function_once ();
2171 init_stor_layout_once ();
2172 init_varasm_once ();
2173 init_EXPR_INSN_LIST_cache ();
2175 /* The following initialization functions need to generate rtl, so
2176 provide a dummy function context for them. */
2177 init_dummy_function_start ();
2180 if (flag_caller_saves
)
2181 init_caller_save ();
2182 expand_dummy_function_end ();
2184 /* If auxiliary info generation is desired, open the output file.
2185 This goes in the same directory as the source file--unlike
2186 all the other output files. */
2187 if (flag_gen_aux_info
)
2189 aux_info_file
= fopen (aux_info_file_name
, "w");
2190 if (aux_info_file
== 0)
2191 fatal_io_error ("can't open %s", aux_info_file_name
);
2194 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2195 because then the driver will have provided the name of a temporary
2196 file or bit bucket for us. */
2198 if (! name_specified
&& asm_file_name
== 0)
2199 asm_out_file
= stdout
;
2202 if (asm_file_name
== 0)
2204 int len
= strlen (dump_base_name
);
2205 char *dumpname
= (char *) xmalloc (len
+ 6);
2206 memcpy (dumpname
, dump_base_name
, len
+ 1);
2207 strip_off_ending (dumpname
, len
);
2208 strcat (dumpname
, ".s");
2209 asm_file_name
= dumpname
;
2211 if (!strcmp (asm_file_name
, "-"))
2212 asm_out_file
= stdout
;
2214 asm_out_file
= fopen (asm_file_name
, "w");
2215 if (asm_out_file
== 0)
2216 fatal_io_error ("can't open %s for writing", asm_file_name
);
2219 #ifdef IO_BUFFER_SIZE
2220 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2221 _IOFBF
, IO_BUFFER_SIZE
);
2225 name
= ggc_strdup (name
);
2227 input_filename
= name
;
2229 /* Put an entry on the input file stack for the main input file. */
2230 push_srcloc (input_filename
, 0);
2232 /* Perform language-specific initialization.
2233 This may set main_input_filename. */
2234 if (lang_hooks
.init
)
2235 (*lang_hooks
.init
) ();
2237 /* If the input doesn't start with a #line, use the input name
2238 as the official input file name. */
2239 if (main_input_filename
== 0)
2240 main_input_filename
= name
;
2242 if (flag_syntax_only
)
2244 write_symbols
= NO_DEBUG
;
2246 profile_block_flag
= 0;
2250 ASM_FILE_START (asm_out_file
);
2252 #ifdef ASM_COMMENT_START
2253 if (flag_verbose_asm
)
2255 /* Print the list of options in effect. */
2256 print_version (asm_out_file
, ASM_COMMENT_START
);
2257 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2258 ASM_COMMENT_START
, " ", "\n");
2259 /* Add a blank line here so it appears in assembler output but not
2261 fprintf (asm_out_file
, "\n");
2265 /* Output something to inform GDB that this compilation was by GCC. */
2266 #ifndef ASM_IDENTIFY_GCC
2267 fprintf (asm_out_file
, "gcc2_compiled.:\n");
2269 ASM_IDENTIFY_GCC (asm_out_file
);
2272 /* Output something to identify which front-end produced this file. */
2273 #ifdef ASM_IDENTIFY_LANGUAGE
2274 ASM_IDENTIFY_LANGUAGE (asm_out_file
);
2276 } /* ! flag_syntax_only */
2278 #ifndef ASM_OUTPUT_SECTION_NAME
2279 if (flag_function_sections
)
2281 warning ("-ffunction-sections not supported for this target.");
2282 flag_function_sections
= 0;
2284 if (flag_data_sections
)
2286 warning ("-fdata-sections not supported for this target.");
2287 flag_data_sections
= 0;
2291 if (flag_function_sections
2292 && (profile_flag
|| profile_block_flag
))
2294 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2295 flag_function_sections
= 0;
2298 #ifndef OBJECT_FORMAT_ELF
2299 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2300 warning ("-ffunction-sections may affect debugging on some targets.");
2303 /* ??? Note: There used to be a conditional here
2304 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2305 This was to guarantee separation between gcc_compiled. and
2306 the first function, for the sake of dbx on Suns.
2307 However, having the extra zero here confused the Emacs
2308 code for unexec, and might confuse other programs too.
2309 Therefore, I took out that change.
2310 In future versions we should find another way to solve
2311 that dbx problem. -- rms, 23 May 93. */
2313 /* Don't let the first function fall at the same address
2314 as gcc_compiled., if profiling. */
2315 if (profile_flag
|| profile_block_flag
)
2317 /* It's best if we can write a nop here since some
2318 assemblers don't tolerate zeros in the text section. */
2319 output_asm_insn (get_insn_template (CODE_FOR_nop
, NULL
), NULL_PTR
);
2322 /* If dbx symbol table desired, initialize writing it
2323 and output the predefined types. */
2324 timevar_push (TV_SYMOUT
);
2325 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2326 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2327 dbxout_init (asm_out_file
, main_input_filename
, getdecls ());
2329 #ifdef SDB_DEBUGGING_INFO
2330 if (write_symbols
== SDB_DEBUG
)
2331 sdbout_init (asm_out_file
, main_input_filename
, getdecls ());
2333 #ifdef DWARF_DEBUGGING_INFO
2334 if (write_symbols
== DWARF_DEBUG
)
2335 dwarfout_init (asm_out_file
, main_input_filename
);
2337 #ifdef DWARF2_UNWIND_INFO
2338 if (dwarf2out_do_frame ())
2339 dwarf2out_frame_init ();
2341 #ifdef DWARF2_DEBUGGING_INFO
2342 if (write_symbols
== DWARF2_DEBUG
)
2343 dwarf2out_init (asm_out_file
, main_input_filename
);
2345 timevar_pop (TV_SYMOUT
);
2347 /* Initialize yet another pass. */
2349 init_final (main_input_filename
);
2350 init_branch_prob (dump_base_name
);
2352 timevar_push (TV_PARSE
);
2354 /* Call the parser, which parses the entire file
2355 (calling rest_of_compilation for each function). */
2357 if (yyparse () != 0)
2359 if (errorcount
== 0)
2360 fnotice (stderr
, "Errors detected in input file (your bison.simple is out of date)\n");
2362 /* In case there were missing closebraces,
2363 get us back to the global binding level. */
2364 while (! global_bindings_p ())
2368 /* Compilation is now finished except for writing
2369 what's left of the symbol table output. */
2371 timevar_pop (TV_PARSE
);
2373 if (flag_syntax_only
)
2376 globals
= getdecls ();
2378 /* Really define vars that have had only a tentative definition.
2379 Really output inline functions that must actually be callable
2380 and have not been output so far. */
2383 int len
= list_length (globals
);
2384 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2388 /* Process the decls in reverse order--earliest first.
2389 Put them into VEC from back to front, then take out from front. */
2391 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2392 vec
[len
- i
- 1] = decl
;
2394 wrapup_global_declarations (vec
, len
);
2396 /* This must occur after the loop to output deferred functions. Else
2397 the profiler initializer would not be emitted if all the functions
2398 in this compilation unit were deferred.
2400 output_func_start_profiler can not cause any additional functions or
2401 data to need to be output, so it need not be in the deferred function
2403 output_func_start_profiler ();
2405 /* Now that all possible functions have been output, we can dump
2406 the exception table. */
2408 #ifndef IA64_UNWIND_INFO
2409 output_exception_table ();
2411 free_exception_table ();
2413 check_global_declarations (vec
, len
);
2419 /* Write out any pending weak symbol declarations. */
2423 /* Do dbx symbols. */
2424 timevar_push (TV_SYMOUT
);
2425 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2426 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2427 dbxout_finish (asm_out_file
, main_input_filename
);
2430 #ifdef DWARF_DEBUGGING_INFO
2431 if (write_symbols
== DWARF_DEBUG
)
2435 #ifdef DWARF2_UNWIND_INFO
2436 if (dwarf2out_do_frame ())
2437 dwarf2out_frame_finish ();
2440 #ifdef DWARF2_DEBUGGING_INFO
2441 if (write_symbols
== DWARF2_DEBUG
)
2442 dwarf2out_finish ();
2444 timevar_pop (TV_SYMOUT
);
2446 /* Output some stuff at end of file if nec. */
2448 end_final (dump_base_name
);
2450 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2452 timevar_push (TV_DUMP
);
2453 open_dump_file (DFI_bp
, NULL
);
2457 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2458 timevar_pop (TV_DUMP
);
2462 ASM_FILE_END (asm_out_file
);
2465 /* Language-specific end of compilation actions. */
2467 if (lang_hooks
.finish
)
2468 (*lang_hooks
.finish
) ();
2470 /* Close the dump files. */
2472 if (flag_gen_aux_info
)
2474 fclose (aux_info_file
);
2476 unlink (aux_info_file_name
);
2479 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2481 timevar_push (TV_DUMP
);
2482 dump_combine_total_stats (rtl_dump_file
);
2483 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2484 timevar_pop (TV_DUMP
);
2487 /* Close non-debugging input and output files. Take special care to note
2488 whether fclose returns an error, since the pages might still be on the
2489 buffer chain while the file is open. */
2493 if (ferror (asm_out_file
) != 0)
2494 fatal_io_error ("error writing to %s", asm_file_name
);
2495 if (fclose (asm_out_file
) != 0)
2496 fatal_io_error ("error closing %s", asm_file_name
);
2498 /* Do whatever is necessary to finish printing the graphs. */
2499 if (graph_dump_format
!= no_graph
)
2503 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2504 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2509 sprintf (seq
, ".%02d.", i
);
2510 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2511 finish_graph_dump_file (dump_base_name
, suffix
);
2518 ggc_print_statistics ();
2519 stringpool_statistics ();
2522 /* Free up memory for the benefit of leak detectors. */
2525 /* Stop timing total execution time. */
2526 timevar_stop (TV_TOTAL
);
2528 /* Print the times. */
2530 timevar_print (stderr
);
2533 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2534 and TYPE_DECL nodes.
2536 This does nothing for local (non-static) variables, unless the
2537 variable is a register variable with an ASMSPEC. In that case, or
2538 if the variable is not an automatice, it sets up the RTL and
2539 outputs any assembler code (label definition, storage allocation
2540 and initialization).
2542 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2543 the assembler symbol name to be used. TOP_LEVEL is nonzero
2544 if this declaration is not within a function. */
2547 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2549 const char *asmspec
;
2553 /* Declarations of variables, and of functions defined elsewhere. */
2555 /* The most obvious approach, to put an #ifndef around where
2556 this macro is used, doesn't work since it's inside a macro call. */
2557 #ifndef ASM_FINISH_DECLARE_OBJECT
2558 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2561 /* Forward declarations for nested functions are not "external",
2562 but we need to treat them as if they were. */
2563 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2564 || TREE_CODE (decl
) == FUNCTION_DECL
)
2566 timevar_push (TV_VARCONST
);
2568 make_decl_rtl (decl
, asmspec
);
2569 /* Don't output anything
2570 when a tentative file-scope definition is seen.
2571 But at end of compilation, do output code for them. */
2572 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2573 assemble_variable (decl
, top_level
, at_end
, 0);
2574 if (decl
== last_assemble_variable_decl
)
2576 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2579 timevar_pop (TV_VARCONST
);
2581 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2583 if (decode_reg_name (asmspec
) >= 0)
2585 SET_DECL_RTL (decl
, NULL_RTX
);
2586 make_decl_rtl (decl
, asmspec
);
2590 error ("invalid register name `%s' for register variable", asmspec
);
2591 DECL_REGISTER (decl
) = 0;
2596 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2597 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2598 && TREE_CODE (decl
) == TYPE_DECL
)
2600 timevar_push (TV_SYMOUT
);
2601 dbxout_symbol (decl
, 0);
2602 timevar_pop (TV_SYMOUT
);
2605 #ifdef SDB_DEBUGGING_INFO
2606 else if (write_symbols
== SDB_DEBUG
&& top_level
2607 && TREE_CODE (decl
) == TYPE_DECL
)
2609 timevar_push (TV_SYMOUT
);
2610 sdbout_symbol (decl
, 0);
2611 timevar_pop (TV_SYMOUT
);
2616 /* Called after finishing a record, union or enumeral type. */
2619 rest_of_type_compilation (type
, toplev
)
2620 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2624 tree type ATTRIBUTE_UNUSED
;
2625 int toplev ATTRIBUTE_UNUSED
;
2628 timevar_push (TV_SYMOUT
);
2629 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2630 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2631 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2633 #ifdef SDB_DEBUGGING_INFO
2634 if (write_symbols
== SDB_DEBUG
)
2635 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2637 #ifdef DWARF2_DEBUGGING_INFO
2638 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2639 dwarf2out_decl (TYPE_STUB_DECL (type
));
2641 timevar_pop (TV_SYMOUT
);
2644 /* DECL is an inline function, whose body is present, but which is not
2645 being output at this point. (We're putting that off until we need
2646 to do it.) If there are any actions that need to take place,
2647 including the emission of debugging information for the function,
2648 this is where they should go. This function may be called by
2649 language-dependent code for front-ends that do not even generate
2650 RTL for functions that don't need to be put out. */
2653 note_deferral_of_defined_inline_function (decl
)
2654 tree decl ATTRIBUTE_UNUSED
;
2656 #ifdef DWARF_DEBUGGING_INFO
2657 /* Generate the DWARF info for the "abstract" instance of a function
2658 which we may later generate inlined and/or out-of-line instances
2660 if (write_symbols
== DWARF_DEBUG
2661 && (DECL_INLINE (decl
) || DECL_ABSTRACT (decl
))
2662 && ! DECL_ABSTRACT_ORIGIN (decl
))
2664 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2665 DWARF code expects it to be set in this case. Intuitively,
2666 DECL is the function we just finished defining, so setting
2667 CURRENT_FUNCTION_DECL is sensible. */
2668 tree saved_cfd
= current_function_decl
;
2669 int was_abstract
= DECL_ABSTRACT (decl
);
2670 current_function_decl
= decl
;
2672 /* Let the DWARF code do its work. */
2673 set_decl_abstract_flags (decl
, 1);
2674 dwarfout_file_scope_decl (decl
, 0);
2676 set_decl_abstract_flags (decl
, 0);
2678 /* Reset CURRENT_FUNCTION_DECL. */
2679 current_function_decl
= saved_cfd
;
2684 /* FNDECL is an inline function which is about to be emitted out of line.
2685 Do any preparation, such as emitting abstract debug info for the inline
2686 before it gets mangled by optimization. */
2689 note_outlining_of_inline_function (fndecl
)
2690 tree fndecl ATTRIBUTE_UNUSED
;
2692 #ifdef DWARF2_DEBUGGING_INFO
2693 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2694 the abstract description of inline functions until something tries to
2695 reference them. Force it out now, before optimizations mangle the
2697 if (write_symbols
== DWARF2_DEBUG
)
2698 dwarf2out_abstract_function (fndecl
);
2702 /* This is called from finish_function (within yyparse)
2703 after each top-level definition is parsed.
2704 It is supposed to compile that function or variable
2705 and output the assembler code for it.
2706 After we return, the tree storage is freed. */
2709 rest_of_compilation (decl
)
2715 int rebuild_label_notes_after_reload
;
2716 int register_life_up_to_date
;
2718 timevar_push (TV_REST_OF_COMPILATION
);
2720 /* Now that we're out of the frontend, we shouldn't have any more
2721 CONCATs anywhere. */
2722 generating_concat_p
= 0;
2724 /* When processing delayed functions, prepare_function_start() won't
2725 have been run to re-initialize it. */
2726 cse_not_expected
= ! optimize
;
2728 /* First, make sure that NOTE_BLOCK is set correctly for each
2729 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2730 if (!cfun
->x_whole_function_mode_p
)
2733 /* Then remove any notes we don't need. That will make iterating
2734 over the instruction sequence faster, and allow the garbage
2735 collector to reclaim the memory used by the notes. */
2736 remove_unnecessary_notes ();
2738 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2739 tree in sensible shape. So, we just recalculate it here. */
2740 if (cfun
->x_whole_function_mode_p
)
2745 /* If we are reconsidering an inline function
2746 at the end of compilation, skip the stuff for making it inline. */
2748 if (DECL_SAVED_INSNS (decl
) == 0)
2754 /* If this is nested inside an inlined external function, pretend
2755 it was only declared. Since we cannot inline such functions,
2756 generating code for this one is not only not necessary but will
2757 confuse some debugging output writers. */
2758 for (parent
= DECL_CONTEXT (current_function_decl
);
2759 parent
!= NULL_TREE
;
2760 parent
= get_containing_scope (parent
))
2761 if (TREE_CODE (parent
) == FUNCTION_DECL
2762 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2764 DECL_INITIAL (decl
) = 0;
2765 goto exit_rest_of_compilation
;
2768 /* If requested, consider whether to make this function inline. */
2769 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2770 || flag_inline_functions
)
2772 timevar_push (TV_INTEGRATION
);
2773 lose
= function_cannot_inline_p (decl
);
2774 timevar_pop (TV_INTEGRATION
);
2775 if (lose
|| ! optimize
)
2777 if (warn_inline
&& DECL_INLINE (decl
))
2778 warning_with_decl (decl
, lose
);
2779 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2780 /* Don't really compile an extern inline function.
2781 If we can't make it inline, pretend
2782 it was only declared. */
2783 if (DECL_EXTERNAL (decl
))
2785 DECL_INITIAL (decl
) = 0;
2786 goto exit_rest_of_compilation
;
2790 /* ??? Note that this has the effect of making it look
2791 like "inline" was specified for a function if we choose
2792 to inline it. This isn't quite right, but it's
2793 probably not worth the trouble to fix. */
2794 inlinable
= DECL_INLINE (decl
) = 1;
2797 insns
= get_insns ();
2799 /* Dump the rtl code if we are dumping rtl. */
2801 if (open_dump_file (DFI_rtl
, decl
))
2803 if (DECL_SAVED_INSNS (decl
))
2804 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2805 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2808 /* If function is inline, and we don't yet know whether to
2809 compile it by itself, defer decision till end of compilation.
2810 finish_compilation will call rest_of_compilation again
2811 for those functions that need to be output. Also defer those
2812 functions that we are supposed to defer. */
2815 || (DECL_INLINE (decl
)
2816 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2817 && ! flag_keep_inline_functions
)
2818 || DECL_EXTERNAL (decl
))))
2819 DECL_DEFER_OUTPUT (decl
) = 1;
2821 if (DECL_INLINE (decl
))
2822 /* DWARF wants seperate debugging info for abstract and
2823 concrete instances of all inline functions, including those
2824 declared inline but not inlined, and those inlined even
2825 though they weren't declared inline. Conveniently, that's
2826 what DECL_INLINE means at this point. */
2827 note_deferral_of_defined_inline_function (decl
);
2829 if (DECL_DEFER_OUTPUT (decl
))
2831 /* If -Wreturn-type, we have to do a bit of compilation. We just
2832 want to call jump_optimize to figure out whether or not we can
2833 fall off the end of the function; we do the minimum amount of
2834 work necessary to make that safe. And, we set optimize to zero
2835 to keep jump_optimize from working too hard. */
2836 if (warn_return_type
)
2838 int saved_optimize
= optimize
;
2841 find_exception_handler_labels ();
2842 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2843 !JUMP_AFTER_REGSCAN
);
2844 optimize
= saved_optimize
;
2847 current_function_nothrow
= nothrow_function_p ();
2848 if (current_function_nothrow
)
2849 /* Now we know that this can't throw; set the flag for the benefit
2850 of other functions later in this translation unit. */
2851 TREE_NOTHROW (current_function_decl
) = 1;
2853 timevar_push (TV_INTEGRATION
);
2854 save_for_inline (decl
);
2855 timevar_pop (TV_INTEGRATION
);
2856 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2857 goto exit_rest_of_compilation
;
2860 /* If specified extern inline but we aren't inlining it, we are
2861 done. This goes for anything that gets here with DECL_EXTERNAL
2862 set, not just things with DECL_INLINE. */
2863 if (DECL_EXTERNAL (decl
))
2864 goto exit_rest_of_compilation
;
2869 /* Initialize some variables used by the optimizers. */
2870 init_function_for_compilation ();
2872 if (! DECL_DEFER_OUTPUT (decl
))
2873 TREE_ASM_WRITTEN (decl
) = 1;
2875 /* Now that integrate will no longer see our rtl, we need not
2876 distinguish between the return value of this function and the
2877 return value of called functions. Also, we can remove all SETs
2878 of subregs of hard registers; they are only here because of
2880 rtx_equal_function_value_matters
= 0;
2881 purge_hard_subreg_sets (get_insns ());
2883 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2884 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2885 goto exit_rest_of_compilation
;
2887 /* Emit code to get eh context, if needed. */
2890 /* We may have potential sibling or tail recursion sites. Select one
2891 (of possibly multiple) methods of performing the call. */
2892 if (flag_optimize_sibling_calls
)
2894 timevar_push (TV_JUMP
);
2895 open_dump_file (DFI_sibling
, decl
);
2897 optimize_sibling_and_tail_recursive_calls ();
2899 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2900 timevar_pop (TV_JUMP
);
2904 /* If we are doing position-independent code generation, now
2905 is the time to output special prologues and epilogues.
2906 We do not want to do this earlier, because it just clutters
2907 up inline functions with meaningless insns. */
2912 insns
= get_insns ();
2914 /* Copy any shared structure that should not be shared. */
2915 unshare_all_rtl (current_function_decl
, insns
);
2917 #ifdef SETJMP_VIA_SAVE_AREA
2918 /* This must be performed before virutal register instantiation. */
2919 if (current_function_calls_alloca
)
2920 optimize_save_area_alloca (insns
);
2923 /* Instantiate all virtual registers. */
2924 instantiate_virtual_regs (current_function_decl
, insns
);
2926 /* Find all the EH handlers. */
2927 find_exception_handler_labels ();
2929 open_dump_file (DFI_jump
, decl
);
2931 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2932 are initialized and to compute whether control can drop off the end
2935 timevar_push (TV_JUMP
);
2936 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2937 before jump optimization switches branch directions. */
2938 expected_value_to_br_prob ();
2940 reg_scan (insns
, max_reg_num (), 0);
2941 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
2942 JUMP_AFTER_REGSCAN
);
2944 timevar_pop (TV_JUMP
);
2946 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2947 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2949 close_dump_file (DFI_jump
, print_rtl
, insns
);
2950 goto exit_rest_of_compilation
;
2953 timevar_push (TV_JUMP
);
2957 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2960 /* ??? Run if-conversion before delete_null_pointer_checks,
2961 since the later does not preserve the CFG. This should
2962 be changed -- no since converting if's that are going to
2964 timevar_push (TV_IFCVT
);
2966 timevar_pop (TV_IFCVT
);
2968 /* Try to identify useless null pointer tests and delete them. */
2969 if (flag_delete_null_pointer_checks
)
2970 delete_null_pointer_checks (insns
);
2973 /* Jump optimization, and the removal of NULL pointer checks, may
2974 have reduced the number of instructions substantially. CSE, and
2975 future passes, allocate arrays whose dimensions involve the
2976 maximum instruction UID, so if we can reduce the maximum UID
2977 we'll save big on memory. */
2978 renumber_insns (rtl_dump_file
);
2979 timevar_pop (TV_JUMP
);
2981 close_dump_file (DFI_jump
, print_rtl
, insns
);
2985 /* Perform common subexpression elimination.
2986 Nonzero value from `cse_main' means that jumps were simplified
2987 and some code may now be unreachable, so do
2988 jump optimization again. */
2992 open_dump_file (DFI_cse
, decl
);
2993 timevar_push (TV_CSE
);
2995 reg_scan (insns
, max_reg_num (), 1);
2997 if (flag_thread_jumps
)
2999 timevar_push (TV_JUMP
);
3000 thread_jumps (insns
, max_reg_num (), 1);
3001 timevar_pop (TV_JUMP
);
3004 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3006 /* If we are not running more CSE passes, then we are no longer
3007 expecting CSE to be run. But always rerun it in a cheap mode. */
3008 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3010 if (tem
|| optimize
> 1)
3012 timevar_push (TV_JUMP
);
3013 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3014 !JUMP_AFTER_REGSCAN
);
3015 timevar_pop (TV_JUMP
);
3018 /* Run this after jump optmizations remove all the unreachable code
3019 so that unreachable code will not keep values live. */
3020 delete_trivially_dead_insns (insns
, max_reg_num ());
3022 /* Try to identify useless null pointer tests and delete them. */
3023 if (flag_delete_null_pointer_checks
)
3025 timevar_push (TV_JUMP
);
3026 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3030 delete_null_pointer_checks (insns
);
3031 timevar_pop (TV_JUMP
);
3034 /* The second pass of jump optimization is likely to have
3035 removed a bunch more instructions. */
3036 renumber_insns (rtl_dump_file
);
3038 timevar_pop (TV_CSE
);
3039 close_dump_file (DFI_cse
, print_rtl
, insns
);
3042 open_dump_file (DFI_addressof
, decl
);
3044 purge_addressof (insns
);
3045 reg_scan (insns
, max_reg_num (), 1);
3047 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3051 if (optimize
> 0 && flag_ssa
)
3053 /* Convert to SSA form. */
3055 timevar_push (TV_TO_SSA
);
3056 open_dump_file (DFI_ssa
, decl
);
3058 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3062 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
3063 timevar_pop (TV_TO_SSA
);
3065 /* The SSA implementation uses basic block numbers in its phi
3066 nodes. Thus, changing the control-flow graph or the basic
3067 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3068 may cause problems. */
3072 /* Remove dead code. */
3074 timevar_push (TV_DEAD_CODE_ELIM
);
3075 open_dump_file (DFI_dce
, decl
);
3077 insns
= get_insns ();
3078 eliminate_dead_code();
3080 close_dump_file (DFI_dce
, print_rtl_with_bb
, insns
);
3081 timevar_pop (TV_DEAD_CODE_ELIM
);
3084 /* Convert from SSA form. */
3086 timevar_push (TV_FROM_SSA
);
3087 open_dump_file (DFI_ussa
, decl
);
3089 convert_from_ssa ();
3090 /* New registers have been created. Rescan their usage. */
3091 reg_scan (insns
, max_reg_num (), 1);
3092 /* Life analysis used in SSA adds log_links but these
3093 shouldn't be there until the flow stage, so clear
3095 clear_log_links (insns
);
3097 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
3098 timevar_pop (TV_FROM_SSA
);
3103 /* Perform global cse. */
3105 if (optimize
> 0 && flag_gcse
)
3107 int save_csb
, save_cfj
;
3110 timevar_push (TV_GCSE
);
3111 open_dump_file (DFI_gcse
, decl
);
3113 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3115 tem
= gcse_main (insns
, rtl_dump_file
);
3117 save_csb
= flag_cse_skip_blocks
;
3118 save_cfj
= flag_cse_follow_jumps
;
3119 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3121 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3123 if (flag_expensive_optimizations
)
3125 timevar_push (TV_CSE
);
3126 reg_scan (insns
, max_reg_num (), 1);
3127 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3128 timevar_pop (TV_CSE
);
3129 cse_not_expected
= !flag_rerun_cse_after_loop
;
3132 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3133 things up. Then possibly re-run CSE again. */
3137 timevar_push (TV_JUMP
);
3138 jump_optimize (insns
, !JUMP_CROSS_JUMP
, !JUMP_NOOP_MOVES
,
3139 !JUMP_AFTER_REGSCAN
);
3140 timevar_pop (TV_JUMP
);
3142 if (flag_expensive_optimizations
)
3144 timevar_push (TV_CSE
);
3145 reg_scan (insns
, max_reg_num (), 1);
3146 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3147 timevar_pop (TV_CSE
);
3151 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3152 timevar_pop (TV_GCSE
);
3155 flag_cse_skip_blocks
= save_csb
;
3156 flag_cse_follow_jumps
= save_cfj
;
3159 /* Move constant computations out of loops. */
3163 timevar_push (TV_LOOP
);
3164 open_dump_file (DFI_loop
, decl
);
3166 if (flag_rerun_loop_opt
)
3168 /* We only want to perform unrolling once. */
3170 loop_optimize (insns
, rtl_dump_file
, 0);
3172 /* The first call to loop_optimize makes some instructions
3173 trivially dead. We delete those instructions now in the
3174 hope that doing so will make the heuristics in loop work
3175 better and possibly speed up compilation. */
3176 delete_trivially_dead_insns (insns
, max_reg_num ());
3178 /* The regscan pass is currently necessary as the alias
3179 analysis code depends on this information. */
3180 reg_scan (insns
, max_reg_num (), 1);
3182 loop_optimize (insns
, rtl_dump_file
,
3183 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3185 close_dump_file (DFI_loop
, print_rtl
, insns
);
3186 timevar_pop (TV_LOOP
);
3193 timevar_push (TV_CSE2
);
3194 open_dump_file (DFI_cse2
, decl
);
3196 if (flag_rerun_cse_after_loop
)
3198 /* Running another jump optimization pass before the second
3199 cse pass sometimes simplifies the RTL enough to allow
3200 the second CSE pass to do a better job. Jump_optimize can change
3201 max_reg_num so we must rerun reg_scan afterwards.
3202 ??? Rework to not call reg_scan so often. */
3203 timevar_push (TV_JUMP
);
3205 reg_scan (insns
, max_reg_num (), 0);
3206 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3207 !JUMP_NOOP_MOVES
, JUMP_AFTER_REGSCAN
);
3209 timevar_push (TV_IFCVT
);
3211 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3215 timevar_pop(TV_IFCVT
);
3217 timevar_pop (TV_JUMP
);
3219 reg_scan (insns
, max_reg_num (), 0);
3220 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3224 timevar_push (TV_JUMP
);
3225 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3226 !JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3227 timevar_pop (TV_JUMP
);
3231 if (flag_thread_jumps
)
3233 /* This pass of jump threading straightens out code
3234 that was kinked by loop optimization. */
3235 timevar_push (TV_JUMP
);
3236 reg_scan (insns
, max_reg_num (), 0);
3237 thread_jumps (insns
, max_reg_num (), 0);
3238 timevar_pop (TV_JUMP
);
3241 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3242 timevar_pop (TV_CSE2
);
3247 cse_not_expected
= 1;
3251 /* Do control and data flow analysis; wrote some of the results to
3254 timevar_push (TV_FLOW
);
3255 open_dump_file (DFI_cfg
, decl
);
3257 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3259 check_function_return_warnings ();
3261 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3263 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3265 timevar_push (TV_BRANCH_PROB
);
3266 open_dump_file (DFI_bp
, decl
);
3270 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3271 timevar_pop (TV_BRANCH_PROB
);
3274 open_dump_file (DFI_life
, decl
);
3279 /* Discover and record the loop depth at the head of each basic
3280 block. The loop infrastructure does the real job for us. */
3281 flow_loops_find (&loops
, LOOP_TREE
);
3283 /* Estimate using heuristics if no profiling info is available. */
3284 if (flag_guess_branch_prob
)
3285 estimate_probability (&loops
);
3288 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3290 flow_loops_free (&loops
);
3292 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3293 mark_constant_function ();
3294 timevar_pop (TV_FLOW
);
3296 register_life_up_to_date
= 1;
3299 if (warn_uninitialized
|| extra_warnings
)
3301 uninitialized_vars_warning (DECL_INITIAL (decl
));
3303 setjmp_args_warning ();
3306 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3310 /* If -opt, try combining insns through substitution. */
3314 int rebuild_jump_labels_after_combine
= 0;
3316 timevar_push (TV_COMBINE
);
3317 open_dump_file (DFI_combine
, decl
);
3319 rebuild_jump_labels_after_combine
3320 = combine_instructions (insns
, max_reg_num ());
3322 /* Combining insns may have turned an indirect jump into a
3323 direct jump. Rebuid the JUMP_LABEL fields of jumping
3325 if (rebuild_jump_labels_after_combine
)
3327 timevar_push (TV_JUMP
);
3328 rebuild_jump_labels (insns
);
3329 timevar_pop (TV_JUMP
);
3331 timevar_push (TV_FLOW
);
3332 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3335 /* Blimey. We've got to have the CFG up to date for the call to
3336 if_convert below. However, the random deletion of blocks
3337 without updating life info can wind up with Wierd Stuff in
3338 global_live_at_end. We then run sched1, which updates things
3339 properly, discovers the wierdness and aborts. */
3340 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3341 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3342 | PROP_SCAN_DEAD_CODE
);
3344 timevar_pop (TV_FLOW
);
3347 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3348 timevar_pop (TV_COMBINE
);
3353 /* Rerun if-conversion, as combine may have simplified things enough to
3354 now meet sequence length restrictions. */
3357 timevar_push (TV_IFCVT
);
3358 open_dump_file (DFI_ce
, decl
);
3364 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3365 timevar_pop (TV_IFCVT
);
3368 /* Register allocation pre-pass, to reduce number of moves
3369 necessary for two-address machines. */
3370 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3372 timevar_push (TV_REGMOVE
);
3373 open_dump_file (DFI_regmove
, decl
);
3375 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3377 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3378 timevar_pop (TV_REGMOVE
);
3383 /* Any of the several passes since flow1 will have munged register
3384 lifetime data a bit. */
3386 register_life_up_to_date
= 0;
3388 #ifdef OPTIMIZE_MODE_SWITCHING
3389 timevar_push (TV_GCSE
);
3391 if (optimize_mode_switching (NULL_PTR
))
3393 /* We did work, and so had to regenerate global life information.
3394 Take advantage of this and don't re-recompute register life
3395 information below. */
3396 register_life_up_to_date
= 1;
3399 timevar_pop (TV_GCSE
);
3402 #ifdef INSN_SCHEDULING
3404 /* Print function header into sched dump now
3405 because doing the sched analysis makes some of the dump. */
3406 if (optimize
> 0 && flag_schedule_insns
)
3408 timevar_push (TV_SCHED
);
3409 open_dump_file (DFI_sched
, decl
);
3411 /* Do control and data sched analysis,
3412 and write some of the results to dump file. */
3414 schedule_insns (rtl_dump_file
);
3416 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3417 timevar_pop (TV_SCHED
);
3421 /* Register lifetime information was updated as part of verifying
3423 register_life_up_to_date
= 1;
3427 /* Determine if the current function is a leaf before running reload
3428 since this can impact optimizations done by the prologue and
3429 epilogue thus changing register elimination offsets. */
3430 current_function_is_leaf
= leaf_function_p ();
3432 timevar_push (TV_LOCAL_ALLOC
);
3433 open_dump_file (DFI_lreg
, decl
);
3435 /* Allocate pseudo-regs that are used only within 1 basic block.
3437 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3438 jump optimizer after register allocation and reloading are finished. */
3440 if (! register_life_up_to_date
)
3441 recompute_reg_usage (insns
, ! optimize_size
);
3442 regclass (insns
, max_reg_num (), rtl_dump_file
);
3443 rebuild_label_notes_after_reload
= local_alloc ();
3445 timevar_pop (TV_LOCAL_ALLOC
);
3447 if (dump_file
[DFI_lreg
].enabled
)
3449 timevar_push (TV_DUMP
);
3451 dump_flow_info (rtl_dump_file
);
3452 dump_local_alloc (rtl_dump_file
);
3454 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3455 timevar_pop (TV_DUMP
);
3460 timevar_push (TV_GLOBAL_ALLOC
);
3461 open_dump_file (DFI_greg
, decl
);
3463 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3464 pass fixing up any insns that are invalid. */
3467 failure
= global_alloc (rtl_dump_file
);
3470 build_insn_chain (insns
);
3471 failure
= reload (insns
, 0);
3474 timevar_pop (TV_GLOBAL_ALLOC
);
3476 if (dump_file
[DFI_greg
].enabled
)
3478 timevar_push (TV_DUMP
);
3480 dump_global_regs (rtl_dump_file
);
3482 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3483 timevar_pop (TV_DUMP
);
3487 goto exit_rest_of_compilation
;
3491 open_dump_file (DFI_postreload
, decl
);
3493 /* Do a very simple CSE pass over just the hard registers. */
3496 timevar_push (TV_RELOAD_CSE_REGS
);
3497 reload_cse_regs (insns
);
3498 timevar_pop (TV_RELOAD_CSE_REGS
);
3501 /* If optimizing, then go ahead and split insns now since we are about
3502 to recompute flow information anyway. Since we can't split insns after
3503 reload, do the splitting unconditionally here to avoid gcc from losing
3511 int old_labelnum
= max_label_num ();
3513 split_all_insns (0);
3514 rebuild_label_notes_after_reload
|= old_labelnum
!= max_label_num ();
3517 /* Register allocation and reloading may have turned an indirect jump into
3518 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3519 jumping instructions. */
3520 if (rebuild_label_notes_after_reload
)
3522 timevar_push (TV_JUMP
);
3524 rebuild_jump_labels (insns
);
3526 timevar_pop (TV_JUMP
);
3529 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3531 /* Re-create the death notes which were deleted during reload. */
3532 timevar_push (TV_FLOW2
);
3533 open_dump_file (DFI_flow2
, decl
);
3535 jump_optimize (insns
, !JUMP_CROSS_JUMP
,
3536 JUMP_NOOP_MOVES
, !JUMP_AFTER_REGSCAN
);
3537 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3539 /* On some machines, the prologue and epilogue code, or parts thereof,
3540 can be represented as RTL. Doing so lets us schedule insns between
3541 it and the rest of the code and also allows delayed branch
3542 scheduling to operate in the epilogue. */
3543 thread_prologue_and_epilogue_insns (insns
);
3548 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3550 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3551 even for machines with possibly nonzero RETURN_POPS_ARGS
3552 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3553 push instructions will have popping returns. */
3554 #ifndef PUSH_ROUNDING
3555 if (!ACCUMULATE_OUTGOING_ARGS
)
3557 combine_stack_adjustments ();
3562 flow2_completed
= 1;
3564 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3565 timevar_pop (TV_FLOW2
);
3567 #ifdef HAVE_peephole2
3568 if (optimize
> 0 && flag_peephole2
)
3570 timevar_push (TV_PEEPHOLE2
);
3571 open_dump_file (DFI_peephole2
, decl
);
3573 peephole2_optimize (rtl_dump_file
);
3575 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3576 timevar_pop (TV_PEEPHOLE2
);
3580 if (optimize
> 0 && flag_rename_registers
)
3582 timevar_push (TV_RENAME_REGISTERS
);
3583 open_dump_file (DFI_rnreg
, decl
);
3585 regrename_optimize ();
3587 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3588 timevar_pop (TV_RENAME_REGISTERS
);
3593 timevar_push (TV_IFCVT2
);
3594 open_dump_file (DFI_ce2
, decl
);
3598 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3599 timevar_pop (TV_IFCVT2
);
3602 #ifdef INSN_SCHEDULING
3603 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3605 timevar_push (TV_SCHED2
);
3606 open_dump_file (DFI_sched2
, decl
);
3608 /* Do control and data sched analysis again,
3609 and write some more of the results to dump file. */
3611 schedule_insns (rtl_dump_file
);
3613 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3614 timevar_pop (TV_SCHED2
);
3620 #ifdef LEAF_REGISTERS
3621 current_function_uses_only_leaf_regs
3622 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3625 if (optimize
> 0 && flag_reorder_blocks
)
3627 timevar_push (TV_REORDER_BLOCKS
);
3628 open_dump_file (DFI_bbro
, decl
);
3630 reorder_basic_blocks ();
3632 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3633 timevar_pop (TV_REORDER_BLOCKS
);
3636 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3637 Also do cross-jumping this time and delete no-op move insns. */
3641 timevar_push (TV_JUMP
);
3642 open_dump_file (DFI_jump2
, decl
);
3644 jump_optimize (insns
, JUMP_CROSS_JUMP
, JUMP_NOOP_MOVES
,
3645 !JUMP_AFTER_REGSCAN
);
3647 /* CFG no longer kept up to date. */
3649 close_dump_file (DFI_jump2
, print_rtl
, insns
);
3650 timevar_pop (TV_JUMP
);
3653 /* If a machine dependent reorganization is needed, call it. */
3654 #ifdef MACHINE_DEPENDENT_REORG
3655 open_dump_file (DFI_mach
, decl
);
3657 MACHINE_DEPENDENT_REORG (insns
);
3659 close_dump_file (DFI_mach
, print_rtl
, insns
);
3664 /* If a scheduling pass for delayed branches is to be done,
3665 call the scheduling code. */
3668 if (optimize
> 0 && flag_delayed_branch
)
3670 timevar_push (TV_DBR_SCHED
);
3671 open_dump_file (DFI_dbr
, decl
);
3673 dbr_schedule (insns
, rtl_dump_file
);
3675 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3676 timevar_pop (TV_DBR_SCHED
);
3682 /* Shorten branches.
3684 Note this must run before reg-stack because of death note (ab)use
3685 in the ia32 backend. */
3686 timevar_push (TV_SHORTEN_BRANCH
);
3687 shorten_branches (get_insns ());
3688 timevar_pop (TV_SHORTEN_BRANCH
);
3691 timevar_push (TV_REG_STACK
);
3692 open_dump_file (DFI_stack
, decl
);
3694 reg_to_stack (insns
, rtl_dump_file
);
3696 close_dump_file (DFI_stack
, print_rtl
, insns
);
3697 timevar_pop (TV_REG_STACK
);
3702 current_function_nothrow
= nothrow_function_p ();
3703 if (current_function_nothrow
)
3704 /* Now we know that this can't throw; set the flag for the benefit
3705 of other functions later in this translation unit. */
3706 TREE_NOTHROW (current_function_decl
) = 1;
3708 /* Now turn the rtl into assembler code. */
3710 timevar_push (TV_FINAL
);
3715 /* Get the function's name, as described by its RTL. This may be
3716 different from the DECL_NAME name used in the source file. */
3718 x
= DECL_RTL (decl
);
3719 if (GET_CODE (x
) != MEM
)
3722 if (GET_CODE (x
) != SYMBOL_REF
)
3724 fnname
= XSTR (x
, 0);
3726 assemble_start_function (decl
, fnname
);
3727 final_start_function (insns
, asm_out_file
, optimize
);
3728 final (insns
, asm_out_file
, optimize
, 0);
3729 final_end_function (insns
, asm_out_file
, optimize
);
3730 assemble_end_function (decl
, fnname
);
3732 fflush (asm_out_file
);
3734 /* Release all memory allocated by flow. */
3735 free_basic_block_vars (0);
3737 /* Release all memory held by regsets now. */
3738 regset_release_memory ();
3740 timevar_pop (TV_FINAL
);
3744 /* Write DBX symbols if requested. */
3746 /* Note that for those inline functions where we don't initially
3747 know for certain that we will be generating an out-of-line copy,
3748 the first invocation of this routine (rest_of_compilation) will
3749 skip over this code by doing a `goto exit_rest_of_compilation;'.
3750 Later on, finish_compilation will call rest_of_compilation again
3751 for those inline functions that need to have out-of-line copies
3752 generated. During that call, we *will* be routed past here. */
3754 timevar_push (TV_SYMOUT
);
3755 #ifdef DBX_DEBUGGING_INFO
3756 if (write_symbols
== DBX_DEBUG
)
3757 dbxout_function (decl
);
3760 #ifdef DWARF_DEBUGGING_INFO
3761 if (write_symbols
== DWARF_DEBUG
)
3762 dwarfout_file_scope_decl (decl
, 0);
3765 #ifdef DWARF2_DEBUGGING_INFO
3766 if (write_symbols
== DWARF2_DEBUG
)
3767 dwarf2out_decl (decl
);
3769 timevar_pop (TV_SYMOUT
);
3771 exit_rest_of_compilation
:
3773 /* In case the function was not output,
3774 don't leave any temporary anonymous types
3775 queued up for sdb output. */
3776 #ifdef SDB_DEBUGGING_INFO
3777 if (write_symbols
== SDB_DEBUG
)
3778 sdbout_types (NULL_TREE
);
3781 reload_completed
= 0;
3782 flow2_completed
= 0;
3785 timevar_push (TV_FINAL
);
3787 /* Clear out the insn_length contents now that they are no
3789 init_insn_lengths ();
3791 /* Clear out the real_constant_chain before some of the rtx's
3792 it runs through become garbage. */
3793 clear_const_double_mem ();
3795 /* Show no temporary slots allocated. */
3798 free_basic_block_vars (0);
3800 timevar_pop (TV_FINAL
);
3802 /* Make sure volatile mem refs aren't considered valid operands for
3803 arithmetic insns. We must call this here if this is a nested inline
3804 function, since the above code leaves us in the init_recog state
3805 (from final.c), and the function context push/pop code does not
3806 save/restore volatile_ok.
3808 ??? Maybe it isn't necessary for expand_start_function to call this
3809 anymore if we do it here? */
3811 init_recog_no_volatile ();
3813 /* We're done with this function. Free up memory if we can. */
3814 free_after_parsing (cfun
);
3815 if (! DECL_DEFER_OUTPUT (decl
))
3816 free_after_compilation (cfun
);
3821 timevar_pop (TV_REST_OF_COMPILATION
);
3831 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3832 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3833 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3834 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3835 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3836 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"));
3838 for (i
= ARRAY_SIZE (f_options
); i
--;)
3840 const char *description
= f_options
[i
].description
;
3842 if (description
!= NULL
&& * description
!= 0)
3843 printf (" -f%-21s %s\n",
3844 f_options
[i
].string
, description
);
3847 printf (_(" -O[number] Set optimisation level to [number]\n"));
3848 printf (_(" -Os Optimise for space rather than speed\n"));
3849 printf (_(" --param <name>=<value> Set constant controlling optimization\n"));
3850 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3851 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3852 printf (_(" -w Suppress warnings\n"));
3853 printf (_(" -W Enable extra warnings\n"));
3855 for (i
= ARRAY_SIZE (W_options
); i
--;)
3857 const char *description
= W_options
[i
].description
;
3859 if (description
!= NULL
&& * description
!= 0)
3860 printf (" -W%-21s %s\n",
3861 W_options
[i
].string
, description
);
3864 printf (_(" -Wunused Enable unused warnings\n"));
3865 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3866 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3867 printf (_(" -p Enable function profiling\n"));
3868 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3869 printf (_(" -a Enable block profiling \n"));
3871 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3872 printf (_(" -ax Enable jump profiling \n"));
3874 printf (_(" -o <file> Place output into <file> \n"));
3876 -G <number> Put global and static data smaller than <number>\n\
3877 bytes into a special section (on some targets)\n"));
3879 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3881 if (debug_args
[i
].description
!= NULL
)
3882 printf (" -g%-21s %s\n",
3883 debug_args
[i
].arg
, debug_args
[i
].description
);
3886 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3887 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3888 printf (_(" -version Display the compiler's version\n"));
3889 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3890 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3891 #if defined INSN_SCHEDULING
3892 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3894 printf (_(" --help Display this information\n"));
3899 /* Display descriptions of language specific options.
3900 If there is no description, note that there is an undocumented option.
3901 If the description is empty, do not display anything. (This allows
3902 options to be deliberately undocumented, for whatever reason).
3903 If the option string is missing, then this is a marker, indicating
3904 that the description string is in fact the name of a language, whose
3905 language specific options are to follow. */
3907 if (ARRAY_SIZE (documented_lang_options
) > 1)
3909 printf (_("\nLanguage specific options:\n"));
3911 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3913 const char *description
= documented_lang_options
[i
].description
;
3914 const char *option
= documented_lang_options
[i
].option
;
3916 if (description
== NULL
)
3921 printf (_(" %-23.23s [undocumented]\n"), option
);
3923 else if (*description
== 0)
3925 else if (option
== NULL
)
3929 (_("\nThere are undocumented %s specific options as well.\n"),
3933 printf (_("\n Options for %s:\n"), description
);
3938 printf (" %-23.23s %s\n", option
, description
);
3943 printf (_("\nThere are undocumented %s specific options as well.\n"),
3946 display_target_options ();
3950 display_target_options ()
3954 if (ARRAY_SIZE (target_switches
) > 1
3955 #ifdef TARGET_OPTIONS
3956 || ARRAY_SIZE (target_options
) > 1
3964 printf (_("\nTarget specific options:\n"));
3966 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3968 const char *option
= target_switches
[i
].name
;
3969 const char *description
= target_switches
[i
].description
;
3971 if (option
== NULL
|| *option
== 0)
3973 else if (description
== NULL
)
3978 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3980 else if (* description
!= 0)
3981 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
3984 #ifdef TARGET_OPTIONS
3985 for (i
= ARRAY_SIZE (target_options
); i
--;)
3987 const char *option
= target_options
[i
].prefix
;
3988 const char *description
= target_options
[i
].description
;
3990 if (option
== NULL
|| *option
== 0)
3992 else if (description
== NULL
)
3997 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3999 else if (* description
!= 0)
4000 doc
+= printf (" -m%-23.23s %s\n", option
, description
);
4006 printf (_("\nThere are undocumented target specific options as well.\n"));
4008 printf (_(" They exist, but they are not documented.\n"));
4013 /* Parse a -d... comand line switch. */
4016 decode_d_option (arg
)
4025 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4026 dump_file
[i
].enabled
= 1;
4035 flag_print_asm_name
= 1;
4038 flag_dump_rtl_in_asm
= 1;
4039 flag_print_asm_name
= 1;
4042 graph_dump_format
= vcg
;
4045 rtl_dump_and_exit
= 1;
4050 case 'D': /* These are handled by the preprocessor. */
4056 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4057 if (c
== dump_file
[i
].debug_switch
)
4059 dump_file
[i
].enabled
= 1;
4064 warning ("unrecognized gcc debugging option: %c", c
);
4069 /* Parse a -f... comand line switch. ARG is the value after the -f.
4070 It is safe to access 'ARG - 2' to generate the full switch name.
4071 Return the number of strings consumed. */
4074 decode_f_option (arg
)
4078 const char *option_value
= NULL
;
4080 /* Search for the option in the table of binary f options. */
4081 for (j
= ARRAY_SIZE (f_options
); j
--;)
4083 if (!strcmp (arg
, f_options
[j
].string
))
4085 *f_options
[j
].variable
= f_options
[j
].on_value
;
4089 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4090 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4092 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4097 if (!strcmp (arg
, "fast-math"))
4098 set_fast_math_flags();
4099 else if (!strcmp (arg
, "no-fast-math"))
4100 set_no_fast_math_flags();
4101 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4102 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4105 read_integral_parameter (option_value
, arg
- 2,
4107 set_param_value ("max-inline-insns", val
);
4109 #ifdef INSN_SCHEDULING
4110 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4111 fix_sched_param ("verbose", option_value
);
4113 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4114 fix_register (option_value
, 1, 1);
4115 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4116 fix_register (option_value
, 0, 1);
4117 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4118 fix_register (option_value
, 0, 0);
4119 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4120 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4121 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4123 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4124 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4125 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4126 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4128 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4129 else if ((option_value
4130 = skip_leading_substring (arg
, "stack-limit-register=")))
4132 int reg
= decode_reg_name (option_value
);
4134 error ("unrecognized register name `%s'", option_value
);
4136 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4138 else if ((option_value
4139 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4142 nm
= ggc_strdup (option_value
);
4143 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4145 else if ((option_value
4146 = skip_leading_substring (arg
, "message-length=")))
4147 diagnostic_message_length_per_line
=
4148 read_integral_parameter (option_value
, arg
- 2,
4149 diagnostic_message_length_per_line
);
4150 else if ((option_value
4151 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4153 if (!strcmp (option_value
, "once"))
4154 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE
);
4155 else if (!strcmp (option_value
, "every-line"))
4156 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
);
4158 error ("Unrecognized option `%s'", arg
- 2);
4160 else if (!strcmp (arg
, "no-stack-limit"))
4161 stack_limit_rtx
= NULL_RTX
;
4162 else if (!strcmp (arg
, "preprocessed"))
4163 /* Recognise this switch but do nothing. This prevents warnings
4164 about an unrecognized switch if cpplib has not been linked in. */
4172 /* Parse a -W... comand line switch. ARG is the value after the -W.
4173 It is safe to access 'ARG - 2' to generate the full switch name.
4174 Return the number of strings consumed. */
4177 decode_W_option (arg
)
4180 const char *option_value
= NULL
;
4183 /* Search for the option in the table of binary W options. */
4185 for (j
= ARRAY_SIZE (W_options
); j
--;)
4187 if (!strcmp (arg
, W_options
[j
].string
))
4189 *W_options
[j
].variable
= W_options
[j
].on_value
;
4193 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4194 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4196 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4201 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4203 id_clash_len
= read_integral_parameter (option_value
, arg
- 2, -1);
4205 if (id_clash_len
!= -1)
4208 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4210 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4212 warn_larger_than
= larger_than_size
!= -1;
4214 else if (!strcmp (arg
, "unused"))
4218 else if (!strcmp (arg
, "no-unused"))
4228 /* Parse a -g... comand line switch. ARG is the value after the -g.
4229 It is safe to access 'ARG - 2' to generate the full switch name.
4230 Return the number of strings consumed. */
4233 decode_g_option (arg
)
4237 /* A lot of code assumes write_symbols == NO_DEBUG if the
4238 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4239 of what debugging type has been selected). This records the
4240 selected type. It is an error to specify more than one
4242 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4243 /* Non-zero if debugging format has been explicitly set.
4244 -g and -ggdb don't explicitly set the debugging format so
4245 -gdwarf -g3 is equivalent to -gdwarf3. */
4246 static int type_explicitly_set_p
= 0;
4247 /* Indexed by enum debug_info_type. */
4248 static const char *debug_type_names
[] =
4250 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4253 /* The maximum admissible debug level value. */
4254 static const unsigned max_debug_level
= 3;
4256 /* Look up ARG in the table. */
4257 for (da
= debug_args
; da
->arg
; da
++)
4259 const int da_len
= strlen (da
->arg
);
4261 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4263 enum debug_info_type type
= da
->debug_type
;
4264 const char *p
= arg
+ da_len
;
4266 if (*p
&& (*p
< '0' || *p
> '9'))
4269 /* A debug flag without a level defaults to level 2.
4270 Note we do not want to call read_integral_parameter
4271 for that case since it will call atoi which
4274 ??? We may want to generalize the interface to
4275 read_integral_parameter to better handle this case
4276 if this case shows up often. */
4278 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4282 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4284 error ("use -gdwarf -g%d for DWARF v1, level %d",
4287 error ("use -gdwarf-2 for DWARF v2");
4290 if (level
> max_debug_level
)
4293 ignoring option `%s' due to invalid debug level specification",
4295 level
= debug_info_level
;
4298 if (type
== NO_DEBUG
)
4300 type
= PREFERRED_DEBUGGING_TYPE
;
4302 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4304 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4305 type
= DWARF2_DEBUG
;
4307 #ifdef DBX_DEBUGGING_INFO
4314 if (type
== NO_DEBUG
)
4315 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4317 /* Does it conflict with an already selected type? */
4318 if (type_explicitly_set_p
4319 /* -g/-ggdb don't conflict with anything. */
4320 && da
->debug_type
!= NO_DEBUG
4321 && type
!= selected_debug_type
)
4322 warning ("`%s' ignored, conflicts with `-g%s'",
4323 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4326 /* If the format has already been set, -g/-ggdb
4327 only change the debug level. */
4328 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4329 /* Don't change debugging type. */
4333 selected_debug_type
= type
;
4334 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4337 write_symbols
= (level
== 0
4339 : selected_debug_type
);
4340 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4341 debug_info_level
= (enum debug_info_level
) level
;
4354 /* Decode the first argument in the argv as a language-independent option.
4355 Return the number of strings consumed. */
4358 independent_decode_option (argc
, argv
)
4362 char *arg
= argv
[0];
4364 if (arg
[0] != '-' || arg
[1] == 0)
4376 if (!strcmp (arg
, "-help"))
4379 exit_after_options
= 1;
4382 if (!strcmp (arg
, "-target-help"))
4384 display_target_options ();
4385 exit_after_options
= 1;
4388 if (!strcmp (arg
, "-version"))
4390 print_version (stderr
, "");
4391 exit_after_options
= 1;
4394 /* Handle '--param <name>=<value>'. */
4395 if (strcmp (arg
, "-param") == 0)
4401 error ("-param option missing argument");
4405 /* Get the '<name>=<value>' parameter. */
4407 /* Look for the `='. */
4408 equal
= strchr (arg
, '=');
4410 error ("invalid --param option: %s", arg
);
4415 /* Zero out the `=' sign so that we get two separate strings. */
4417 /* Figure out what value is specified. */
4418 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4419 if (val
!= INVALID_PARAM_VAL
)
4420 set_param_value (arg
, val
);
4422 error ("invalid parameter value `%s'", equal
+ 1);
4437 /* Already been treated in main (). Do nothing. */
4441 set_target_switch (arg
+ 1);
4445 return decode_f_option (arg
+ 1);
4448 return decode_g_option (arg
+ 1);
4451 if (!strcmp (arg
, "dumpbase"))
4456 dump_base_name
= argv
[1];
4460 decode_d_option (arg
+ 1);
4464 if (!strcmp (arg
, "pedantic"))
4466 else if (!strcmp (arg
, "pedantic-errors"))
4467 flag_pedantic_errors
= pedantic
= 1;
4468 else if (arg
[1] == 0)
4475 if (!strcmp (arg
, "quiet"))
4482 if (!strcmp (arg
, "version"))
4490 inhibit_warnings
= 1;
4499 /* We save the value of warn_uninitialized, since if they put
4500 -Wuninitialized on the command line, we need to generate a
4501 warning about not using it without also specifying -O. */
4502 if (warn_uninitialized
!= 1)
4503 warn_uninitialized
= 2;
4506 return decode_W_option (arg
+ 1);
4512 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4513 warning ("`-a' option (basic block profile) not supported");
4515 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4518 else if (!strcmp (arg
, "ax"))
4520 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4521 warning ("`-ax' option (jump profiling) not supported");
4523 profile_block_flag
= (!profile_block_flag
4524 || profile_block_flag
== 2) ? 2 : 3;
4527 else if (!strncmp (arg
, "aux-info", 8))
4529 flag_gen_aux_info
= 1;
4535 aux_info_file_name
= argv
[1];
4539 aux_info_file_name
= arg
+ 8;
4551 asm_file_name
= argv
[1];
4566 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4571 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4575 if (g_switch_val
== -1)
4579 g_switch_set
= TRUE
;
4580 g_switch_value
= g_switch_val
;
4590 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4591 Decode command args, then call compile_file.
4592 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4593 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4595 It is not safe to call this function more than once. */
4598 toplev_main (argc
, argv
)
4605 /* save in case md file wants to emit args as a comment. */
4609 p
= argv
[0] + strlen (argv
[0]);
4610 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4614 xmalloc_set_program_name (progname
);
4616 /* LC_CTYPE determines the character set used by the terminal so it has be set
4617 to output messages correctly. */
4619 #ifdef HAVE_LC_MESSAGES
4620 setlocale (LC_CTYPE
, "");
4621 setlocale (LC_MESSAGES
, "");
4623 setlocale (LC_ALL
, "");
4626 (void) bindtextdomain (PACKAGE
, localedir
);
4627 (void) textdomain (PACKAGE
);
4629 /* Install handler for SIGFPE, which may be received while we do
4630 compile-time floating point arithmetic. */
4631 signal (SIGFPE
, float_signal
);
4633 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4635 signal (SIGSEGV
, crash_signal
);
4638 signal (SIGILL
, crash_signal
);
4641 signal (SIGBUS
, crash_signal
);
4644 signal (SIGABRT
, crash_signal
);
4646 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4647 signal (SIGIOT
, crash_signal
);
4650 decl_printable_name
= decl_name
;
4651 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4653 /* Initialize whether `char' is signed. */
4654 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4655 #ifdef DEFAULT_SHORT_ENUMS
4656 /* Initialize how much space enums occupy, by default. */
4657 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4660 /* Initialize the garbage-collector. */
4663 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4664 ggc_add_tree_root (¤t_function_decl
, 1);
4665 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4667 /* Initialize the diagnostics reporting machinery. */
4668 initialize_diagnostics ();
4670 /* Register the language-independent parameters. */
4671 add_params (lang_independent_params
, LAST_PARAM
);
4673 /* Perform language-specific options intialization. */
4674 if (lang_hooks
.init_options
)
4675 (*lang_hooks
.init_options
) ();
4677 /* Scan to see what optimization level has been specified. That will
4678 determine the default value of many flags. */
4679 for (i
= 1; i
< argc
; i
++)
4681 if (!strcmp (argv
[i
], "-O"))
4686 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4688 /* Handle -Os, -O2, -O3, -O69, ... */
4689 char *p
= &argv
[i
][2];
4691 if ((p
[0] == 's') && (p
[1] == 0))
4695 /* Optimizing for size forces optimize to be 2. */
4700 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4701 if (optimize_val
!= -1)
4703 optimize
= optimize_val
;
4713 flag_thread_jumps
= 1;
4715 flag_delayed_branch
= 1;
4717 #ifdef CAN_DEBUG_WITHOUT_FP
4718 flag_omit_frame_pointer
= 1;
4720 flag_guess_branch_prob
= 1;
4725 flag_optimize_sibling_calls
= 1;
4726 flag_cse_follow_jumps
= 1;
4727 flag_cse_skip_blocks
= 1;
4729 flag_expensive_optimizations
= 1;
4730 flag_strength_reduce
= 1;
4731 flag_rerun_cse_after_loop
= 1;
4732 flag_rerun_loop_opt
= 1;
4733 flag_caller_saves
= 1;
4736 #ifdef INSN_SCHEDULING
4737 flag_schedule_insns
= 1;
4738 flag_schedule_insns_after_reload
= 1;
4741 flag_strict_aliasing
= 1;
4742 flag_delete_null_pointer_checks
= 1;
4743 flag_reorder_blocks
= 1;
4748 flag_inline_functions
= 1;
4749 flag_rename_registers
= 1;
4752 if (optimize
< 2 || optimize_size
)
4757 align_functions
= 1;
4760 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4763 set_target_switch ("");
4765 /* Unwind tables are always present in an ABI-conformant IA-64
4766 object file, so the default should be ON. */
4767 #ifdef IA64_UNWIND_INFO
4768 flag_unwind_tables
= IA64_UNWIND_INFO
;
4771 #ifdef OPTIMIZATION_OPTIONS
4772 /* Allow default optimizations to be specified on a per-machine basis. */
4773 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4776 /* Initialize register usage now so switches may override. */
4779 /* Perform normal command line switch decoding. */
4780 for (i
= 1; i
< argc
;)
4782 unsigned int lang_processed
;
4783 unsigned int indep_processed
;
4785 /* Give the language a chance to decode the option for itself. */
4786 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4788 /* Now see if the option also has a language independent meaning.
4789 Some options are both language specific and language independent,
4791 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4793 if (lang_processed
|| indep_processed
)
4794 i
+= MAX (lang_processed
, indep_processed
);
4797 const char *option
= NULL
;
4798 const char *lang
= NULL
;
4801 /* It is possible that the command line switch is not valid for the
4802 current language, but it is valid for another language. In order
4803 to be compatible with previous versions of the compiler (which
4804 did not issue an error message in this case) we check for this
4805 possibility here. If we do find a match, then if extra_warnings
4806 is set we generate a warning message, otherwise we will just
4807 ignore the option. */
4808 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4810 option
= documented_lang_options
[j
].option
;
4813 lang
= documented_lang_options
[j
].description
;
4814 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4818 if (j
!= ARRAY_SIZE (documented_lang_options
))
4822 warning ("Ignoring command line option '%s'", argv
[i
]);
4825 ("(It is valid for %s but not the selected language)",
4829 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4830 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4832 error ("Unrecognized option `%s'", argv
[i
]);
4838 /* All command line options have been processed. */
4839 if (lang_hooks
.post_options
)
4840 (*lang_hooks
.post_options
) ();
4842 if (exit_after_options
)
4845 /* Reflect any language-specific diagnostic option setting. */
4846 reshape_diagnostic_buffer ();
4848 /* Checker uses the frame pointer. */
4849 if (flag_check_memory_usage
)
4850 flag_omit_frame_pointer
= 0;
4854 /* Inlining does not work if not optimizing,
4855 so force it not to be done. */
4859 /* The c_decode_option function and decode_option hook set
4860 this to `2' if -Wall is used, so we can avoid giving out
4861 lots of errors for people who don't realize what -Wall does. */
4862 if (warn_uninitialized
== 1)
4863 warning ("-Wuninitialized is not supported without -O");
4866 #ifdef OVERRIDE_OPTIONS
4867 /* Some machines may reject certain combinations of options. */
4871 /* Set up the align_*_log variables, defaulting them to 1 if they
4872 were still unset. */
4873 if (align_loops
<= 0) align_loops
= 1;
4874 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4875 if (align_jumps
<= 0) align_jumps
= 1;
4876 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4877 if (align_labels
<= 0) align_labels
= 1;
4878 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4879 if (align_functions
<= 0) align_functions
= 1;
4880 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4882 if (profile_block_flag
== 3)
4884 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4885 profile_block_flag
= 2;
4888 /* Unrolling all loops implies that standard loop unrolling must also
4890 if (flag_unroll_all_loops
)
4891 flag_unroll_loops
= 1;
4892 /* Loop unrolling requires that strength_reduction be on also. Silently
4893 turn on strength reduction here if it isn't already on. Also, the loop
4894 unrolling code assumes that cse will be run after loop, so that must
4895 be turned on also. */
4896 if (flag_unroll_loops
)
4898 flag_strength_reduce
= 1;
4899 flag_rerun_cse_after_loop
= 1;
4902 /* Warn about options that are not supported on this machine. */
4903 #ifndef INSN_SCHEDULING
4904 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4905 warning ("instruction scheduling not supported on this target machine");
4908 if (flag_delayed_branch
)
4909 warning ("this target machine does not have delayed branches");
4912 user_label_prefix
= USER_LABEL_PREFIX
;
4913 if (flag_leading_underscore
!= -1)
4915 /* If the default prefix is more complicated than "" or "_",
4916 issue a warning and ignore this option. */
4917 if (user_label_prefix
[0] == 0 ||
4918 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4920 user_label_prefix
= flag_leading_underscore
? "_" : "";
4923 warning ("-f%sleading-underscore not supported on this target machine",
4924 flag_leading_underscore
? "" : "no-");
4927 /* If we are in verbose mode, write out the version and maybe all the
4928 option flags in use. */
4931 print_version (stderr
, "");
4933 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4936 compile_file (filename
);
4938 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4941 char *lim
= (char *) sbrk (0);
4943 fnotice (stderr
, "Data size %ld.\n", (long) (lim
- (char *) &environ
));
4948 system ("ps -l 1>&2");
4951 #endif /* not USG */
4954 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4957 return (FATAL_EXIT_CODE
);
4959 return (FATAL_EXIT_CODE
);
4960 return (SUCCESS_EXIT_CODE
);
4963 /* Decode -m switches. */
4964 /* Decode the switch -mNAME. */
4967 set_target_switch (name
)
4971 int valid_target_option
= 0;
4973 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4974 if (!strcmp (target_switches
[j
].name
, name
))
4976 if (target_switches
[j
].value
< 0)
4977 target_flags
&= ~-target_switches
[j
].value
;
4979 target_flags
|= target_switches
[j
].value
;
4980 valid_target_option
= 1;
4983 #ifdef TARGET_OPTIONS
4984 if (!valid_target_option
)
4985 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4987 int len
= strlen (target_options
[j
].prefix
);
4988 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4990 *target_options
[j
].variable
= name
+ len
;
4991 valid_target_option
= 1;
4996 if (!valid_target_option
)
4997 error ("Invalid option `%s'", name
);
5000 /* Print version information to FILE.
5001 Each line begins with INDENT (for the case where FILE is the
5002 assembler output file). */
5005 print_version (file
, indent
)
5010 #define __VERSION__ "[?]"
5014 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5016 "%s%s%s version %s (%s) compiled by CC.\n"
5018 , indent
, *indent
!= 0 ? " " : "",
5019 language_string
, version_string
, TARGET_NAME
,
5020 indent
, __VERSION__
);
5023 /* Print an option value and return the adjusted position in the line.
5024 ??? We don't handle error returns from fprintf (disk full); presumably
5025 other code will catch a disk full though. */
5028 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5031 const char *indent
, *sep
, *term
, *type
, *name
;
5033 /* The ultrix fprintf returns 0 on success, so compute the result we want
5034 here since we need it for the following test. */
5035 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5040 fprintf (file
, "%s", term
);
5045 fprintf (file
, "%s", indent
);
5046 pos
= strlen (indent
);
5048 fprintf (file
, "%s%s%s", sep
, type
, name
);
5053 /* Print active target switches to FILE.
5054 POS is the current cursor position and MAX is the size of a "line".
5055 Each line begins with INDENT and ends with TERM.
5056 Each switch is separated from the next by SEP. */
5059 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5062 const char *indent
, *sep
, *term
;
5067 /* Print the options as passed. */
5069 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5070 _("options passed: "), "");
5072 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5076 if (strcmp (*p
, "-o") == 0)
5082 if (strcmp (*p
, "-quiet") == 0)
5084 if (strcmp (*p
, "-version") == 0)
5089 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5092 fprintf (file
, "%s", term
);
5094 /* Print the -f and -m options that have been enabled.
5095 We don't handle language specific options but printing argv
5098 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5099 _("options enabled: "), "");
5101 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5102 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5103 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5104 "-f", f_options
[j
].string
);
5106 /* Print target specific options. */
5108 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5109 if (target_switches
[j
].name
[0] != '\0'
5110 && target_switches
[j
].value
> 0
5111 && ((target_switches
[j
].value
& target_flags
)
5112 == target_switches
[j
].value
))
5114 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5115 "-m", target_switches
[j
].name
);
5118 #ifdef TARGET_OPTIONS
5119 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5120 if (*target_options
[j
].variable
!= NULL
)
5123 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5124 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5125 prefix
, *target_options
[j
].variable
);
5129 fprintf (file
, "%s", term
);
5132 /* Record the beginning of a new source file, named FILENAME. */
5135 debug_start_source_file (filename
)
5136 register const char *filename ATTRIBUTE_UNUSED
;
5138 #ifdef DBX_DEBUGGING_INFO
5139 if (write_symbols
== DBX_DEBUG
)
5140 dbxout_start_new_source_file (filename
);
5142 #ifdef DWARF_DEBUGGING_INFO
5143 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5144 && write_symbols
== DWARF_DEBUG
)
5145 dwarfout_start_new_source_file (filename
);
5146 #endif /* DWARF_DEBUGGING_INFO */
5147 #ifdef DWARF2_DEBUGGING_INFO
5148 if (write_symbols
== DWARF2_DEBUG
)
5149 dwarf2out_start_source_file (filename
);
5150 #endif /* DWARF2_DEBUGGING_INFO */
5151 #ifdef SDB_DEBUGGING_INFO
5152 if (write_symbols
== SDB_DEBUG
)
5153 sdbout_start_new_source_file (filename
);
5157 /* Record the resumption of a source file. LINENO is the line number in
5158 the source file we are returning to. */
5161 debug_end_source_file (lineno
)
5162 register unsigned lineno ATTRIBUTE_UNUSED
;
5164 #ifdef DBX_DEBUGGING_INFO
5165 if (write_symbols
== DBX_DEBUG
)
5166 dbxout_resume_previous_source_file ();
5168 #ifdef DWARF_DEBUGGING_INFO
5169 if (debug_info_level
== DINFO_LEVEL_VERBOSE
5170 && write_symbols
== DWARF_DEBUG
)
5171 dwarfout_resume_previous_source_file (lineno
);
5172 #endif /* DWARF_DEBUGGING_INFO */
5173 #ifdef DWARF2_DEBUGGING_INFO
5174 if (write_symbols
== DWARF2_DEBUG
)
5175 dwarf2out_end_source_file ();
5176 #endif /* DWARF2_DEBUGGING_INFO */
5177 #ifdef SDB_DEBUGGING_INFO
5178 if (write_symbols
== SDB_DEBUG
)
5179 sdbout_resume_previous_source_file ();
5183 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5184 the tail part of the directive line, i.e. the part which is past the
5185 initial whitespace, #, whitespace, directive-name, whitespace part. */
5188 debug_define (lineno
, buffer
)
5189 register unsigned lineno ATTRIBUTE_UNUSED
;
5190 register const char *buffer ATTRIBUTE_UNUSED
;
5192 #ifdef DWARF_DEBUGGING_INFO
5193 if (write_symbols
== DWARF_DEBUG
)
5194 dwarfout_define (lineno
, buffer
);
5195 #endif /* DWARF_DEBUGGING_INFO */
5196 #ifdef DWARF2_DEBUGGING_INFO
5197 if (write_symbols
== DWARF2_DEBUG
)
5198 dwarf2out_define (lineno
, buffer
);
5199 #endif /* DWARF2_DEBUGGING_INFO */
5202 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5203 the tail part of the directive line, i.e. the part which is past the
5204 initial whitespace, #, whitespace, directive-name, whitespace part. */
5207 debug_undef (lineno
, buffer
)
5208 register unsigned lineno ATTRIBUTE_UNUSED
;
5209 register const char *buffer ATTRIBUTE_UNUSED
;
5211 #ifdef DWARF_DEBUGGING_INFO
5212 if (write_symbols
== DWARF_DEBUG
)
5213 dwarfout_undef (lineno
, buffer
);
5214 #endif /* DWARF_DEBUGGING_INFO */
5215 #ifdef DWARF2_DEBUGGING_INFO
5216 if (write_symbols
== DWARF2_DEBUG
)
5217 dwarf2out_undef (lineno
, buffer
);
5218 #endif /* DWARF2_DEBUGGING_INFO */
5221 /* Returns nonzero if it is appropriate not to emit any debugging
5222 information for BLOCK, because it doesn't contain any instructions.
5223 This may not be the case for blocks containing nested functions, since
5224 we may actually call such a function even though the BLOCK information
5228 debug_ignore_block (block
)
5229 tree block ATTRIBUTE_UNUSED
;
5231 /* Never delete the BLOCK for the outermost scope
5232 of the function; we can refer to names from
5233 that scope even if the block notes are messed up. */
5234 if (is_body_block (block
))
5237 #ifdef DWARF2_DEBUGGING_INFO
5238 if (write_symbols
== DWARF2_DEBUG
)
5239 return dwarf2out_ignore_block (block
);