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 GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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 #include "dwarf2asm.h"
68 #include "integrate.h"
72 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
73 #include "dwarf2out.h"
76 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
80 #ifdef SDB_DEBUGGING_INFO
84 #ifdef XCOFF_DEBUGGING_INFO
85 #include "xcoffout.h" /* Needed for external data
86 declarations for e.g. AIX 4.x. */
90 /* The extra parameters substantially improve the I/O performance. */
93 vms_fopen (fname
, type
)
97 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
98 fixed arguments, which matches ANSI's specification but not VAXCRTL's
99 pre-ANSI implementation. This hack circumvents the mismatch problem. */
100 FILE *(*vmslib_fopen
)() = (FILE *(*)()) fopen
;
103 return (*vmslib_fopen
) (fname
, type
, "mbc=32",
104 "deq=64", "fop=tef", "shr=nil");
106 return (*vmslib_fopen
) (fname
, type
, "mbc=32");
109 #define fopen vms_fopen
112 #ifndef DEFAULT_GDB_EXTENSIONS
113 #define DEFAULT_GDB_EXTENSIONS 1
116 /* If more than one debugging type is supported, you must define
117 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
119 This is one long line cause VAXC can't handle a \-newline. */
120 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
121 #ifndef PREFERRED_DEBUGGING_TYPE
122 You Lose
! You must define PREFERRED_DEBUGGING_TYPE
!
123 #endif /* no PREFERRED_DEBUGGING_TYPE */
124 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
125 so the following code needn't care. */
126 #ifdef DBX_DEBUGGING_INFO
127 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
129 #ifdef SDB_DEBUGGING_INFO
130 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
132 #ifdef DWARF_DEBUGGING_INFO
133 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
135 #ifdef DWARF2_DEBUGGING_INFO
136 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
138 #ifdef XCOFF_DEBUGGING_INFO
139 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
141 #endif /* More than one debugger format enabled. */
143 /* If still not defined, must have been because no debugging formats
145 #ifndef PREFERRED_DEBUGGING_TYPE
146 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
149 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
150 extern char **environ
;
153 /* Carry information from ASM_DECLARE_OBJECT_NAME
154 to ASM_FINISH_DECLARE_OBJECT. */
156 extern int size_directive_output
;
157 extern tree last_assemble_variable_decl
;
159 static void set_target_switch
PARAMS ((const char *));
160 static const char *decl_name
PARAMS ((tree
, int));
162 static void float_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
163 static void crash_signal
PARAMS ((int)) ATTRIBUTE_NORETURN
;
164 static void set_float_handler
PARAMS ((jmp_buf));
165 static void compile_file
PARAMS ((const char *));
166 static void display_help
PARAMS ((void));
167 static void display_target_options
PARAMS ((void));
169 static void decode_d_option
PARAMS ((const char *));
170 static int decode_f_option
PARAMS ((const char *));
171 static int decode_W_option
PARAMS ((const char *));
172 static int decode_g_option
PARAMS ((const char *));
173 static unsigned int independent_decode_option
PARAMS ((int, char **));
175 static void print_version
PARAMS ((FILE *, const char *));
176 static int print_single_switch
PARAMS ((FILE *, int, int, const char *,
177 const char *, const char *,
178 const char *, const char *));
179 static void print_switch_values
PARAMS ((FILE *, int, int, const char *,
180 const char *, const char *));
182 /* Length of line when printing switch values. */
185 /* Name of program invoked, sans directories. */
187 const char *progname
;
189 /* Copy of arguments to toplev_main. */
193 /* Name of current original source file (what was input to cpp).
194 This comes from each #-command in the actual input. */
196 const char *input_filename
;
198 /* Name of top-level original source file (what was input to cpp).
199 This comes from the #-command at the beginning of the actual input.
200 If there isn't any there, then this is the cc1 input file name. */
202 const char *main_input_filename
;
204 /* Current line number in real source file. */
208 /* Nonzero if it is unsafe to create any new pseudo registers. */
211 /* Stack of currently pending input files. */
213 struct file_stack
*input_file_stack
;
215 /* Incremented on each change to input_file_stack. */
216 int input_file_stack_tick
;
218 /* Name to use as base of names for dump output files. */
220 const char *dump_base_name
;
222 /* Bit flags that specify the machine subtype we are compiling for.
223 Bits are tested using macros TARGET_... defined in the tm.h file
224 and set by `-m...' switches. Must be defined in rtlanal.c. */
226 extern int target_flags
;
228 /* Debug hooks - dependent upon command line options. */
230 struct gcc_debug_hooks
*debug_hooks
;
232 /* Describes a dump file. */
234 struct dump_file_info
236 /* The unique extension to apply, e.g. ".jump". */
237 const char *const extension
;
239 /* The -d<c> character that enables this dump file. */
240 char const debug_switch
;
242 /* True if there is a corresponding graph dump file. */
243 char const graph_dump_p
;
245 /* True if the user selected this dump. */
248 /* True if the files have been initialized (ie truncated). */
252 /* Enumerate the extant dump files. */
291 /* Describes all the dump files. Should be kept in order of the
292 pass and in sync with dump_file_index above.
294 Remaining -d letters:
300 struct dump_file_info dump_file
[DFI_MAX
] =
302 { "rtl", 'r', 0, 0, 0 },
303 { "sibling", 'i', 0, 0, 0 },
304 { "eh", 'h', 0, 0, 0 },
305 { "jump", 'j', 0, 0, 0 },
306 { "ssa", 'e', 1, 0, 0 },
307 { "ssaccp", 'W', 1, 0, 0 },
308 { "ssadce", 'X', 1, 0, 0 },
309 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
310 { "cse", 's', 0, 0, 0 },
311 { "addressof", 'F', 0, 0, 0 },
312 { "gcse", 'G', 1, 0, 0 },
313 { "loop", 'L', 1, 0, 0 },
314 { "cse2", 't', 1, 0, 0 },
315 { "cfg", 'f', 1, 0, 0 },
316 { "bp", 'b', 1, 0, 0 },
317 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
318 { "combine", 'c', 1, 0, 0 },
319 { "ce", 'C', 1, 0, 0 },
320 { "regmove", 'N', 1, 0, 0 },
321 { "sched", 'S', 1, 0, 0 },
322 { "lreg", 'l', 1, 0, 0 },
323 { "greg", 'g', 1, 0, 0 },
324 { "postreload", 'o', 1, 0, 0 },
325 { "flow2", 'w', 1, 0, 0 },
326 { "peephole2", 'z', 1, 0, 0 },
327 { "rnreg", 'n', 1, 0, 0 },
328 { "ce2", 'E', 1, 0, 0 },
329 { "sched2", 'R', 1, 0, 0 },
330 { "stack", 'k', 1, 0, 0 },
331 { "bbro", 'B', 1, 0, 0 },
332 { "mach", 'M', 1, 0, 0 },
333 { "dbr", 'd', 0, 0, 0 },
336 static int open_dump_file
PARAMS ((enum dump_file_index
, tree
));
337 static void close_dump_file
PARAMS ((enum dump_file_index
,
338 void (*) (FILE *, rtx
), rtx
));
340 /* Other flags saying which kinds of debugging dump have been requested. */
342 int rtl_dump_and_exit
;
343 int flag_print_asm_name
;
344 static int version_flag
;
345 static char *filename
;
346 enum graph_dump_types graph_dump_format
;
348 /* Name for output file of assembly code, specified with -o. */
352 /* Value of the -G xx switch, and whether it was passed or not. */
356 /* Type(s) of debugging information we are producing (if any).
357 See flags.h for the definitions of the different possible
358 types of debugging information. */
359 enum debug_info_type write_symbols
= NO_DEBUG
;
361 /* Level of debugging information we are producing. See flags.h
362 for the definitions of the different possible levels. */
363 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
365 /* Nonzero means use GNU-only extensions in the generated symbolic
366 debugging information. */
367 /* Currently, this only has an effect when write_symbols is set to
368 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
369 int use_gnu_debug_info_extensions
= 0;
371 /* Nonzero means do optimizations. -O.
372 Particular numeric values stand for particular amounts of optimization;
373 thus, -O2 stores 2 here. However, the optimizations beyond the basic
374 ones are not controlled directly by this variable. Instead, they are
375 controlled by individual `flag_...' variables that are defaulted
376 based on this variable. */
380 /* Nonzero means optimize for size. -Os.
381 The only valid values are zero and non-zero. When optimize_size is
382 non-zero, optimize defaults to 2, but certain individual code
383 bloating optimizations are disabled. */
385 int optimize_size
= 0;
387 /* Nonzero if we should exit after parsing options. */
388 static int exit_after_options
= 0;
390 /* The FUNCTION_DECL for the function currently being compiled,
391 or 0 if between functions. */
392 tree current_function_decl
;
394 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
396 tree current_function_func_begin_label
;
398 /* Pointer to function to compute the name to use to print a declaration.
399 DECL is the declaration in question.
400 VERBOSITY determines what information will be printed:
401 0: DECL_NAME, demangled as necessary.
402 1: and scope information.
403 2: and any other information that might be interesting, such as function
404 parameter types in C++. */
406 const char *(*decl_printable_name
) PARAMS ((tree
, int));
408 /* Pointer to function to compute rtl for a language-specific tree code. */
410 typedef rtx (*lang_expand_expr_t
)
411 PARAMS ((union tree_node
*, rtx
, enum machine_mode
,
412 enum expand_modifier modifier
));
414 lang_expand_expr_t lang_expand_expr
= 0;
416 tree (*lang_expand_constant
) PARAMS ((tree
)) = 0;
418 /* Pointer to function to finish handling an incomplete decl at the
419 end of compilation. */
421 void (*incomplete_decl_finalize_hook
) PARAMS ((tree
)) = 0;
423 /* Nonzero if doing dwarf2 duplicate elimination. */
425 int flag_eliminate_dwarf2_dups
= 0;
427 /* Nonzero if generating code to do profiling. */
429 int profile_flag
= 0;
431 /* Nonzero if generating code to do profiling on a line-by-line basis. */
433 int profile_block_flag
;
435 /* Nonzero if generating code to profile program flow graph arcs. */
437 int profile_arc_flag
= 0;
439 /* Nonzero if generating info for gcov to calculate line test coverage. */
441 int flag_test_coverage
= 0;
443 /* Nonzero indicates that branch taken probabilities should be calculated. */
445 int flag_branch_probabilities
= 0;
447 /* Nonzero if basic blocks should be reordered. */
449 int flag_reorder_blocks
= 0;
451 /* Nonzero if registers should be renamed. */
453 int flag_rename_registers
= 0;
455 /* Nonzero for -pedantic switch: warn about anything
456 that standard spec forbids. */
460 /* Temporarily suppress certain warnings.
461 This is set while reading code from a system header file. */
463 int in_system_header
= 0;
465 /* Don't print functions as they are compiled. -quiet. */
469 /* Print times taken by the various passes. -ftime-report. */
473 /* Print memory still in use at end of compilation (which may have little
474 to do with peak memory consumption). -fmem-report. */
478 /* Non-zero means to collect statistics which might be expensive
479 and to print them when we are done. */
480 int flag_detailed_statistics
= 0;
485 /* Nonzero means `char' should be signed. */
487 int flag_signed_char
;
489 /* Nonzero means give an enum type only as many bytes as it needs. */
491 int flag_short_enums
;
493 /* Nonzero for -fcaller-saves: allocate values in regs that need to
494 be saved across function calls, if that produces overall better code.
495 Optional now, so people can test it. */
497 #ifdef DEFAULT_CALLER_SAVES
498 int flag_caller_saves
= 1;
500 int flag_caller_saves
= 0;
503 /* Nonzero if structures and unions should be returned in memory.
505 This should only be defined if compatibility with another compiler or
506 with an ABI is needed, because it results in slower code. */
508 #ifndef DEFAULT_PCC_STRUCT_RETURN
509 #define DEFAULT_PCC_STRUCT_RETURN 1
512 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
514 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
516 /* Nonzero for -fforce-mem: load memory value into a register
517 before arithmetic on it. This makes better cse but slower compilation. */
519 int flag_force_mem
= 0;
521 /* Nonzero for -fforce-addr: load memory address into a register before
522 reference to memory. This makes better cse but slower compilation. */
524 int flag_force_addr
= 0;
526 /* Nonzero for -fdefer-pop: don't pop args after each function call;
527 instead save them up to pop many calls' args with one insns. */
529 int flag_defer_pop
= 0;
531 /* Nonzero for -ffloat-store: don't allocate floats and doubles
532 in extended-precision registers. */
534 int flag_float_store
= 0;
536 /* Nonzero for -fcse-follow-jumps:
537 have cse follow jumps to do a more extensive job. */
539 int flag_cse_follow_jumps
;
541 /* Nonzero for -fcse-skip-blocks:
542 have cse follow a branch around a block. */
543 int flag_cse_skip_blocks
;
545 /* Nonzero for -fexpensive-optimizations:
546 perform miscellaneous relatively-expensive optimizations. */
547 int flag_expensive_optimizations
;
549 /* Nonzero for -fthread-jumps:
550 have jump optimize output of loop. */
552 int flag_thread_jumps
;
554 /* Nonzero enables strength-reduction in loop.c. */
556 int flag_strength_reduce
= 0;
558 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
559 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
560 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
563 int flag_unroll_loops
;
565 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
566 This is generally not a win. */
568 int flag_unroll_all_loops
;
570 /* Nonzero forces all invariant computations in loops to be moved
573 int flag_move_all_movables
= 0;
575 /* Nonzero forces all general induction variables in loops to be
578 int flag_reduce_all_givs
= 0;
580 /* Nonzero to perform full register move optimization passes. This is the
583 int flag_regmove
= 0;
585 /* Nonzero for -fwritable-strings:
586 store string constants in data segment and don't uniquize them. */
588 int flag_writable_strings
= 0;
590 /* Nonzero means don't put addresses of constant functions in registers.
591 Used for compiling the Unix kernel, where strange substitutions are
592 done on the assembly output. */
594 int flag_no_function_cse
= 0;
596 /* Nonzero for -fomit-frame-pointer:
597 don't make a frame pointer in simple functions that don't require one. */
599 int flag_omit_frame_pointer
= 0;
601 /* Nonzero means place each function into its own section on those platforms
602 which support arbitrary section names and unlimited numbers of sections. */
604 int flag_function_sections
= 0;
606 /* ... and similar for data. */
608 int flag_data_sections
= 0;
610 /* Nonzero to inhibit use of define_optimization peephole opts. */
612 int flag_no_peephole
= 0;
614 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
616 int flag_optimize_sibling_calls
= 0;
618 /* Nonzero means the front end generally wants `errno' maintained by math
619 operations, like built-in SQRT. */
621 int flag_errno_math
= 1;
623 /* Nonzero means that unsafe floating-point math optimizations are allowed
624 for the sake of speed. IEEE compliance is not guaranteed, and operations
625 are allowed to assume that their arguments and results are "normal"
626 (e.g., nonnegative for SQRT). */
628 int flag_unsafe_math_optimizations
= 0;
630 /* Zero means that floating-point math operations cannot generate a
631 (user-visible) trap. This is the case, for example, in nonstop
632 IEEE 754 arithmetic. */
634 int flag_trapping_math
= 1;
636 /* 0 means straightforward implementation of complex divide acceptable.
637 1 means wide ranges of inputs must work for complex divide.
638 2 means C99-like requirements for complex divide (not yet implemented). */
640 int flag_complex_divide_method
= 0;
642 /* Nonzero means all references through pointers are volatile. */
646 /* Nonzero means treat all global and extern variables as volatile. */
648 int flag_volatile_global
;
650 /* Nonzero means treat all static variables as volatile. */
652 int flag_volatile_static
;
654 /* Nonzero means just do syntax checking; don't output anything. */
656 int flag_syntax_only
= 0;
658 /* Nonzero means perform global cse. */
660 static int flag_gcse
;
662 /* Nonzero means to use global dataflow analysis to eliminate
663 useless null pointer tests. */
665 static int flag_delete_null_pointer_checks
;
667 /* Nonzero means to do the enhanced load motion during gcse, which trys
668 to hoist loads by not killing them when a store to the same location
671 int flag_gcse_lm
= 1;
673 /* Nonzero means to perform store motion after gcse, which will try to
674 move stores closer to the exit block. Its not very effective without
677 int flag_gcse_sm
= 1;
679 /* Nonzero means to rerun cse after loop optimization. This increases
680 compilation time about 20% and picks up a few more common expressions. */
682 static int flag_rerun_cse_after_loop
;
684 /* Nonzero means to run loop optimizations twice. */
686 int flag_rerun_loop_opt
;
688 /* Nonzero for -finline-functions: ok to inline functions that look like
689 good inline candidates. */
691 int flag_inline_functions
;
693 /* Nonzero for -fkeep-inline-functions: even if we make a function
694 go inline everywhere, keep its definition around for debugging
697 int flag_keep_inline_functions
;
699 /* Nonzero means that functions will not be inlined. */
703 /* Nonzero means that we should emit static const variables
704 regardless of whether or not optimization is turned on. */
706 int flag_keep_static_consts
= 1;
708 /* Nonzero means we should be saving declaration info into a .X file. */
710 int flag_gen_aux_info
= 0;
712 /* Specified name of aux-info file. */
714 static char *aux_info_file_name
;
716 /* Nonzero means make the text shared if supported. */
718 int flag_shared_data
;
720 /* Nonzero means schedule into delayed branch slots if supported. */
722 int flag_delayed_branch
;
724 /* Nonzero if we are compiling pure (sharable) code.
725 Value is 1 if we are doing reasonable (i.e. simple
726 offset into offset table) pic. Value is 2 if we can
727 only perform register offsets. */
731 /* Nonzero means generate extra code for exception handling and enable
732 exception handling. */
736 /* Nonzero means generate frame unwind info table when supported. */
738 int flag_unwind_tables
= 0;
740 /* Nonzero means don't place uninitialized global data in common storage
745 /* Nonzero means pretend it is OK to examine bits of target floats,
746 even if that isn't true. The resulting code will have incorrect constants,
747 but the same series of instructions that the native compiler would make. */
749 int flag_pretend_float
;
751 /* Nonzero means change certain warnings into errors.
752 Usually these are warnings about failure to conform to some standard. */
754 int flag_pedantic_errors
= 0;
756 /* flag_schedule_insns means schedule insns within basic blocks (before
758 flag_schedule_insns_after_reload means schedule insns after
761 int flag_schedule_insns
= 0;
762 int flag_schedule_insns_after_reload
= 0;
764 /* The following flags have effect only for scheduling before register
767 flag_schedule_interblock means schedule insns accross basic blocks.
768 flag_schedule_speculative means allow speculative motion of non-load insns.
769 flag_schedule_speculative_load means allow speculative motion of some
771 flag_schedule_speculative_load_dangerous allows speculative motion of more
774 int flag_schedule_interblock
= 1;
775 int flag_schedule_speculative
= 1;
776 int flag_schedule_speculative_load
= 0;
777 int flag_schedule_speculative_load_dangerous
= 0;
779 int flag_single_precision_constant
;
781 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
782 by a cheaper branch on a count register. */
783 int flag_branch_on_count_reg
= 1;
785 /* -finhibit-size-directive inhibits output of .size for ELF.
786 This is used only for compiling crtstuff.c,
787 and it may be extended to other effects
788 needed for crtstuff.c on other systems. */
789 int flag_inhibit_size_directive
= 0;
791 /* -fverbose-asm causes extra commentary information to be produced in
792 the generated assembly code (to make it more readable). This option
793 is generally only of use to those who actually need to read the
794 generated assembly code (perhaps while debugging the compiler itself).
795 -fno-verbose-asm, the default, causes the extra information
796 to be omitted and is useful when comparing two assembler files. */
798 int flag_verbose_asm
= 0;
800 /* -dA causes debug commentary information to be produced in
801 the generated assembly code (to make it more readable). This option
802 is generally only of use to those who actually need to read the
803 generated assembly code (perhaps while debugging the compiler itself).
804 Currently, this switch is only used by dwarfout.c; however, it is intended
805 to be a catchall for printing debug information in the assembler file. */
807 int flag_debug_asm
= 0;
809 /* -dP causes the rtl to be emitted as a comment in assembly. */
811 int flag_dump_rtl_in_asm
= 0;
813 /* -fgnu-linker specifies use of the GNU linker for initializations.
814 (Or, more generally, a linker that handles initializations.)
815 -fno-gnu-linker says that collect2 will be used. */
817 int flag_gnu_linker
= 0;
819 int flag_gnu_linker
= 1;
825 /* Enable ssa conditional constant propagation. */
826 int flag_ssa_ccp
= 0;
828 /* Enable ssa aggressive dead code elimination. */
829 int flag_ssa_dce
= 0;
831 /* Tag all structures with __attribute__(packed). */
832 int flag_pack_struct
= 0;
834 /* Emit code to check for stack overflow; also may cause large objects
835 to be allocated dynamically. */
836 int flag_stack_check
;
838 /* When non-NULL, indicates that whenever space is allocated on the
839 stack, the resulting stack pointer must not pass this
840 address---that is, for stacks that grow downward, the stack pointer
841 must always be greater than or equal to this address; for stacks
842 that grow upward, the stack pointer must be less than this address.
843 At present, the rtx may be either a REG or a SYMBOL_REF, although
844 the support provided depends on the backend. */
847 /* -fcheck-memory-usage causes extra code to be generated in order to check
848 memory accesses. This is used by a detector of bad memory accesses such
850 int flag_check_memory_usage
= 0;
852 /* -fprefix-function-name causes function name to be prefixed. This
853 can be used with -fcheck-memory-usage to isolate code compiled with
854 -fcheck-memory-usage. */
855 int flag_prefix_function_name
= 0;
857 /* 0 if pointer arguments may alias each other. True in C.
858 1 if pointer arguments may not alias each other but may alias
860 2 if pointer arguments may not alias each other and may not
861 alias global variables. True in Fortran.
862 This defaults to 0 for C. */
863 int flag_argument_noalias
= 0;
865 /* Nonzero if we should do (language-dependent) alias analysis.
866 Typically, this analysis will assume that expressions of certain
867 types do not alias expressions of certain other types. Only used
868 if alias analysis (in general) is enabled. */
869 int flag_strict_aliasing
= 0;
871 /* Instrument functions with calls at entry and exit, for profiling. */
872 int flag_instrument_function_entry_exit
= 0;
874 /* Nonzero means ignore `#ident' directives. 0 means handle them.
875 On SVR4 targets, it also controls whether or not to emit a
876 string identifying the compiler. */
878 int flag_no_ident
= 0;
880 /* This will perform a peephole pass before sched2. */
881 int flag_peephole2
= 0;
883 /* This will try to guess branch probabilities. */
884 int flag_guess_branch_prob
= 0;
886 /* -fbounded-pointers causes gcc to compile pointers as composite
887 objects occupying three words: the pointer value, the base address
888 of the referent object, and the address immediately beyond the end
889 of the referent object. The base and extent allow us to perform
890 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
891 int flag_bounded_pointers
= 0;
893 /* -fcheck-bounds causes gcc to generate array bounds checks.
894 For C, C++: defaults to value of flag_bounded_pointers.
895 For ObjC: defaults to off.
896 For Java: defaults to on.
897 For Fortran: defaults to off.
898 For CHILL: defaults to off. */
899 int flag_bounds_check
= 0;
901 /* This will attempt to merge constant section constants, if 1 only
902 string constants and constants from constant pool, if 2 also constant
904 int flag_merge_constants
= 1;
906 /* If one, renumber instruction UIDs to reduce the number of
907 unused UIDs if there are a lot of instructions. If greater than
908 one, unconditionally renumber instruction UIDs. */
909 int flag_renumber_insns
= 1;
911 /* Values of the -falign-* flags: how much to align labels in code.
912 0 means `use default', 1 means `don't align'.
913 For each variable, there is an _log variant which is the power
914 of two not less than the variable, for .align output. */
921 int align_labels_log
;
923 int align_functions_log
;
925 /* Table of supported debugging formats. */
928 const char *const arg
;
929 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
930 constant expression, we use NO_DEBUG in its place. */
931 const enum debug_info_type debug_type
;
932 const int use_extensions_p
;
933 const char *const description
;
937 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
938 N_("Generate debugging info in default format") },
939 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
940 #ifdef DBX_DEBUGGING_INFO
941 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
942 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
944 #ifdef DWARF_DEBUGGING_INFO
945 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
946 { "dwarf+", DWARF_DEBUG
, 1,
947 N_("Generate extended DWARF-1 format debug info") },
949 #ifdef DWARF2_DEBUGGING_INFO
950 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
952 #ifdef XCOFF_DEBUGGING_INFO
953 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
954 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
956 #ifdef SDB_DEBUGGING_INFO
957 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
967 const char *description
;
969 lang_independent_options
;
973 /* Add or remove a leading underscore from user symbols. */
974 int flag_leading_underscore
= -1;
976 /* The user symbol prefix after having resolved same. */
977 const char *user_label_prefix
;
979 static const param_info lang_independent_params
[] = {
980 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
981 { OPTION, DEFAULT, HELP },
982 #include "params.def"
987 /* A default for same. */
988 #ifndef USER_LABEL_PREFIX
989 #define USER_LABEL_PREFIX ""
992 /* Table of language-independent -f options.
993 STRING is the option name. VARIABLE is the address of the variable.
994 ON_VALUE is the value to store in VARIABLE
995 if `-fSTRING' is seen as an option.
996 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
998 lang_independent_options f_options
[] =
1000 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1,
1001 N_("Perform DWARF2 duplicate elimination") },
1002 {"float-store", &flag_float_store
, 1,
1003 N_("Do not store floats in registers") },
1004 {"volatile", &flag_volatile
, 1,
1005 N_("Consider all mem refs through pointers as volatile") },
1006 {"volatile-global", &flag_volatile_global
, 1,
1007 N_("Consider all mem refs to global data to be volatile") },
1008 {"volatile-static", &flag_volatile_static
, 1,
1009 N_("Consider all mem refs to static data to be volatile") },
1010 {"defer-pop", &flag_defer_pop
, 1,
1011 N_("Defer popping functions args from stack until later") },
1012 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1,
1013 N_("When possible do not generate stack frames") },
1014 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1,
1015 N_("Optimize sibling and tail recursive calls") },
1016 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1,
1017 N_("When running CSE, follow jumps to their targets") },
1018 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1,
1019 N_("When running CSE, follow conditional jumps") },
1020 {"expensive-optimizations", &flag_expensive_optimizations
, 1,
1021 N_("Perform a number of minor, expensive optimisations") },
1022 {"thread-jumps", &flag_thread_jumps
, 1,
1023 N_("Perform jump threading optimisations") },
1024 {"strength-reduce", &flag_strength_reduce
, 1,
1025 N_("Perform strength reduction optimisations") },
1026 {"unroll-loops", &flag_unroll_loops
, 1,
1027 N_("Perform loop unrolling when iteration count is known") },
1028 {"unroll-all-loops", &flag_unroll_all_loops
, 1,
1029 N_("Perform loop unrolling for all loops") },
1030 {"move-all-movables", &flag_move_all_movables
, 1,
1031 N_("Force all loop invariant computations out of loops") },
1032 {"reduce-all-givs", &flag_reduce_all_givs
, 1,
1033 N_("Strength reduce all loop general induction variables") },
1034 {"writable-strings", &flag_writable_strings
, 1,
1035 N_("Store strings in writable data section") },
1036 {"peephole", &flag_no_peephole
, 0,
1037 N_("Enable machine specific peephole optimisations") },
1038 {"force-mem", &flag_force_mem
, 1,
1039 N_("Copy memory operands into registers before using") },
1040 {"force-addr", &flag_force_addr
, 1,
1041 N_("Copy memory address constants into regs before using") },
1042 {"function-cse", &flag_no_function_cse
, 0,
1043 N_("Allow function addresses to be held in registers") },
1044 {"inline-functions", &flag_inline_functions
, 1,
1045 N_("Integrate simple functions into their callers") },
1046 {"keep-inline-functions", &flag_keep_inline_functions
, 1,
1047 N_("Generate code for funcs even if they are fully inlined") },
1048 {"inline", &flag_no_inline
, 0,
1049 N_("Pay attention to the 'inline' keyword") },
1050 {"keep-static-consts", &flag_keep_static_consts
, 1,
1051 N_("Emit static const variables even if they are not used") },
1052 {"syntax-only", &flag_syntax_only
, 1,
1053 N_("Check for syntax errors, then stop") },
1054 {"shared-data", &flag_shared_data
, 1,
1055 N_("Mark data as shared rather than private") },
1056 {"caller-saves", &flag_caller_saves
, 1,
1057 N_("Enable saving registers around function calls") },
1058 {"pcc-struct-return", &flag_pcc_struct_return
, 1,
1059 N_("Return 'short' aggregates in memory, not registers") },
1060 {"reg-struct-return", &flag_pcc_struct_return
, 0,
1061 N_("Return 'short' aggregates in registers") },
1062 {"delayed-branch", &flag_delayed_branch
, 1,
1063 N_("Attempt to fill delay slots of branch instructions") },
1064 {"gcse", &flag_gcse
, 1,
1065 N_("Perform the global common subexpression elimination") },
1066 {"gcse-lm", &flag_gcse_lm
, 1,
1067 N_("Perform enhanced load motion during global subexpression elimination") },
1068 {"gcse-sm", &flag_gcse_sm
, 1,
1069 N_("Perform store motion after global subexpression elimination") },
1070 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1,
1071 N_("Run CSE pass after loop optimisations") },
1072 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1,
1073 N_("Run the loop optimiser twice") },
1074 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1,
1075 N_("Delete useless null pointer checks") },
1076 {"pretend-float", &flag_pretend_float
, 1,
1077 N_("Pretend that host and target use the same FP format") },
1078 {"schedule-insns", &flag_schedule_insns
, 1,
1079 N_("Reschedule instructions before register allocation") },
1080 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1,
1081 N_("Reschedule instructions after register allocation") },
1082 {"sched-interblock",&flag_schedule_interblock
, 1,
1083 N_("Enable scheduling across basic blocks") },
1084 {"sched-spec",&flag_schedule_speculative
, 1,
1085 N_("Allow speculative motion of non-loads") },
1086 {"sched-spec-load",&flag_schedule_speculative_load
, 1,
1087 N_("Allow speculative motion of some loads") },
1088 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1,
1089 N_("Allow speculative motion of more loads") },
1090 {"branch-count-reg",&flag_branch_on_count_reg
, 1,
1091 N_("Replace add,compare,branch with branch on count reg") },
1092 {"pic", &flag_pic
, 1,
1093 N_("Generate position independent code, if possible") },
1094 {"PIC", &flag_pic
, 2, ""},
1095 {"exceptions", &flag_exceptions
, 1,
1096 N_("Enable exception handling") },
1097 {"unwind-tables", &flag_unwind_tables
, 1,
1098 N_("Just generate unwind tables for exception handling") },
1099 {"non-call-exceptions", &flag_non_call_exceptions
, 1,
1100 N_("Support synchronous non-call exceptions") },
1101 {"profile-arcs", &profile_arc_flag
, 1,
1102 N_("Insert arc based program profiling code") },
1103 {"test-coverage", &flag_test_coverage
, 1,
1104 N_("Create data files needed by gcov") },
1105 {"branch-probabilities", &flag_branch_probabilities
, 1,
1106 N_("Use profiling information for branch probabilities") },
1107 {"reorder-blocks", &flag_reorder_blocks
, 1,
1108 N_("Reorder basic blocks to improve code placement") },
1109 {"rename-registers", &flag_rename_registers
, 1,
1110 N_("Do the register renaming optimization pass") },
1111 {"common", &flag_no_common
, 0,
1112 N_("Do not put unitialised globals in the common section") },
1113 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1,
1114 N_("Do not generate .size directives") },
1115 {"function-sections", &flag_function_sections
, 1,
1116 N_("place each function into its own section") },
1117 {"data-sections", &flag_data_sections
, 1,
1118 N_("place data items into their own section") },
1119 {"verbose-asm", &flag_verbose_asm
, 1,
1120 N_("Add extra commentry to assembler output") },
1121 {"gnu-linker", &flag_gnu_linker
, 1,
1122 N_("Output GNU ld formatted global initialisers") },
1123 {"regmove", &flag_regmove
, 1,
1124 N_("Enables a register move optimisation") },
1125 {"optimize-register-move", &flag_regmove
, 1,
1126 N_("Do the full regmove optimization pass") },
1127 {"pack-struct", &flag_pack_struct
, 1,
1128 N_("Pack structure members together without holes") },
1129 {"stack-check", &flag_stack_check
, 1,
1130 N_("Insert stack checking code into the program") },
1131 {"argument-alias", &flag_argument_noalias
, 0,
1132 N_("Specify that arguments may alias each other & globals") },
1133 {"argument-noalias", &flag_argument_noalias
, 1,
1134 N_("Assume arguments may alias globals but not each other") },
1135 {"argument-noalias-global", &flag_argument_noalias
, 2,
1136 N_("Assume arguments do not alias each other or globals") },
1137 {"strict-aliasing", &flag_strict_aliasing
, 1,
1138 N_("Assume strict aliasing rules apply") },
1139 {"align-loops", &align_loops
, 0,
1140 N_("Align the start of loops") },
1141 {"align-jumps", &align_jumps
, 0,
1142 N_("Align labels which are only reached by jumping") },
1143 {"align-labels", &align_labels
, 0,
1144 N_("Align all labels") },
1145 {"align-functions", &align_functions
, 0,
1146 N_("Align the start of functions") },
1147 {"merge-constants", &flag_merge_constants
, 1,
1148 N_("Attempt to merge identical constants accross compilation units") },
1149 {"merge-all-constants", &flag_merge_constants
, 2,
1150 N_("Attempt to merge identical constants and constant variables") },
1151 {"check-memory-usage", &flag_check_memory_usage
, 1,
1152 N_("Generate code to check every memory access") },
1153 {"prefix-function-name", &flag_prefix_function_name
, 1,
1154 N_("Add a prefix to all function names") },
1155 {"dump-unnumbered", &flag_dump_unnumbered
, 1,
1156 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1157 {"instrument-functions", &flag_instrument_function_entry_exit
, 1,
1158 N_("Instrument function entry/exit with profiling calls") },
1159 {"ssa", &flag_ssa
, 1,
1160 N_("Enable SSA optimizations") },
1161 {"ssa-ccp", &flag_ssa_ccp
, 1,
1162 N_("Enable SSA conditonal constant propagation") },
1163 {"ssa-dce", &flag_ssa_dce
, 1,
1164 N_("Enable aggressive SSA dead code elimination") },
1165 {"leading-underscore", &flag_leading_underscore
, 1,
1166 N_("External symbols have a leading underscore") },
1167 {"ident", &flag_no_ident
, 0,
1168 N_("Process #ident directives") },
1169 { "peephole2", &flag_peephole2
, 1,
1170 N_("Enables an rtl peephole pass run before sched2") },
1171 { "guess-branch-probability", &flag_guess_branch_prob
, 1,
1172 N_("Enables guessing of branch probabilities") },
1173 {"math-errno", &flag_errno_math
, 1,
1174 N_("Set errno after built-in math functions") },
1175 {"trapping-math", &flag_trapping_math
, 1,
1176 N_("Floating-point operations can trap") },
1177 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1,
1178 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1179 {"bounded-pointers", &flag_bounded_pointers
, 1,
1180 N_("Compile pointers as triples: value, base & end") },
1181 {"bounds-check", &flag_bounds_check
, 1,
1182 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1183 {"single-precision-constant", &flag_single_precision_constant
, 1,
1184 N_("Convert floating point constant to single precision constant") },
1185 {"time-report", &time_report
, 1,
1186 N_("Report time taken by each compiler pass at end of run") },
1187 {"mem-report", &mem_report
, 1,
1188 N_("Report on permanent memory allocation at end of run") },
1189 { "trapv", &flag_trapv
, 1,
1190 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1193 /* Table of language-specific options. */
1195 static const struct lang_opt
1197 const char *const option
;
1198 const char *const description
;
1200 documented_lang_options
[] =
1202 /* In order not to overload the --help output, the convention
1203 used here is to only describe those options which are not
1204 enabled by default. */
1207 N_("Compile just for ISO C89") },
1208 { "-fallow-single-precision",
1209 N_("Do not promote floats to double if using -traditional") },
1211 N_("Determine language standard") },
1213 { "-fsigned-bitfields", "" },
1214 { "-funsigned-bitfields",
1215 N_("Make bitfields by unsigned by default") },
1216 { "-fno-signed-bitfields", "" },
1217 { "-fno-unsigned-bitfields","" },
1219 N_("Make 'char' be signed by default") },
1220 { "-funsigned-char",
1221 N_("Make 'char' be unsigned by default") },
1222 { "-fno-signed-char", "" },
1223 { "-fno-unsigned-char", "" },
1225 { "-ftraditional", "" },
1227 N_("Attempt to support traditional K&R style C") },
1228 { "-fnotraditional", "" },
1229 { "-fno-traditional", "" },
1233 N_("Do not recognise the 'asm' keyword") },
1234 { "-fbuiltin", "" },
1236 N_("Do not recognise any built in functions") },
1238 N_("Assume normal C execution environment") },
1239 { "-fno-hosted", "" },
1241 N_("Assume that standard libraries & main might not exist") },
1242 { "-fno-freestanding", "" },
1243 { "-fcond-mismatch",
1244 N_("Allow different types as args of ? operator") },
1245 { "-fno-cond-mismatch", "" },
1246 { "-fdollars-in-identifiers",
1247 N_("Allow the use of $ inside identifiers") },
1248 { "-fno-dollars-in-identifiers", "" },
1249 { "-fpreprocessed", "" },
1250 { "-fno-preprocessed", "" },
1252 N_("Use the same size for double as for float") },
1253 { "-fno-short-double", "" },
1255 N_("Use the smallest fitting integer to hold enums") },
1256 { "-fno-short-enums", "" },
1258 N_("Override the underlying type for wchar_t to `unsigned short'") },
1259 { "-fno-short-wchar", "" },
1262 N_("Enable most warning messages") },
1263 { "-Wbad-function-cast",
1264 N_("Warn about casting functions to incompatible types") },
1265 { "-Wno-bad-function-cast", "" },
1266 { "-Wno-missing-noreturn", "" },
1267 { "-Wmissing-format-attribute",
1268 N_("Warn about functions which might be candidates for format attributes") },
1269 { "-Wno-missing-format-attribute", "" },
1271 N_("Warn about casts which discard qualifiers") },
1272 { "-Wno-cast-qual", "" },
1273 { "-Wchar-subscripts",
1274 N_("Warn about subscripts whose type is 'char'") },
1275 { "-Wno-char-subscripts", "" },
1277 N_("Warn if nested comments are detected") },
1278 { "-Wno-comment", "" },
1280 N_("Warn if nested comments are detected") },
1281 { "-Wno-comments", "" },
1283 N_("Warn about possibly confusing type conversions") },
1284 { "-Wno-conversion", "" },
1286 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1287 { "-Wno-format", "" },
1288 { "-Wformat-y2k", "" },
1289 { "-Wno-format-y2k",
1290 N_("Don't warn about strftime formats yielding 2 digit years") },
1291 { "-Wformat-extra-args", "" },
1292 { "-Wno-format-extra-args",
1293 N_("Don't warn about too many arguments to format functions") },
1294 { "-Wformat-nonliteral",
1295 N_("Warn about non-string-literal format strings") },
1296 { "-Wno-format-nonliteral", "" },
1297 { "-Wformat-security",
1298 N_("Warn about possible security problems with format functions") },
1299 { "-Wno-format-security", "" },
1300 { "-Wimplicit-function-declaration",
1301 N_("Warn about implicit function declarations") },
1302 { "-Wno-implicit-function-declaration", "" },
1303 { "-Werror-implicit-function-declaration", "" },
1305 N_("Warn when a declaration does not specify a type") },
1306 { "-Wno-implicit-int", "" },
1307 { "-Wimplicit", "" },
1308 { "-Wno-implicit", "" },
1310 N_("Warn about the use of the #import directive") },
1311 { "-Wno-import", "" },
1312 { "-Wlong-long","" },
1314 N_("Do not warn about using 'long long' when -pedantic") },
1316 N_("Warn about suspicious declarations of main") },
1317 { "-Wno-main", "" },
1318 { "-Wmissing-braces",
1319 N_("Warn about possibly missing braces around initialisers") },
1320 { "-Wno-missing-braces", "" },
1321 { "-Wmissing-declarations",
1322 N_("Warn about global funcs without previous declarations") },
1323 { "-Wno-missing-declarations", "" },
1324 { "-Wmissing-prototypes",
1325 N_("Warn about global funcs without prototypes") },
1326 { "-Wno-missing-prototypes", "" },
1328 N_("Warn about use of multicharacter literals") },
1329 { "-Wno-multichar", "" },
1330 { "-Wnested-externs",
1331 N_("Warn about externs not at file scope level") },
1332 { "-Wno-nested-externs", "" },
1334 N_("Warn about possible missing parentheses") },
1335 { "-Wno-parentheses", "" },
1336 { "-Wsequence-point",
1337 N_("Warn about possible violations of sequence point rules") },
1338 { "-Wno-sequence-point", "" },
1339 { "-Wpointer-arith",
1340 N_("Warn about function pointer arithmetic") },
1341 { "-Wno-pointer-arith", "" },
1342 { "-Wredundant-decls",
1343 N_("Warn about multiple declarations of the same object") },
1344 { "-Wno-redundant-decls", "" },
1346 N_("Warn about signed/unsigned comparisons") },
1347 { "-Wno-sign-compare", "" },
1349 N_("Warn about testing equality of floating point numbers") },
1350 { "-Wno-float-equal", "" },
1351 { "-Wunknown-pragmas",
1352 N_("Warn about unrecognized pragmas") },
1353 { "-Wno-unknown-pragmas", "" },
1354 { "-Wstrict-prototypes",
1355 N_("Warn about non-prototyped function decls") },
1356 { "-Wno-strict-prototypes", "" },
1358 N_("Warn about constructs whose meaning change in ISO C") },
1359 { "-Wno-traditional", "" },
1361 N_("Warn when trigraphs are encountered") },
1362 { "-Wno-trigraphs", "" },
1364 { "-Wno-undef", "" },
1365 { "-Wwrite-strings",
1366 N_("Mark strings as 'const char *'") },
1367 { "-Wno-write-strings", "" },
1369 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1371 #include "options.h"
1375 /* Here is a table, controlled by the tm.h file, listing each -m switch
1376 and which bits in `target_switches' it should set or clear.
1377 If VALUE is positive, it is bits to set.
1378 If VALUE is negative, -VALUE is bits to clear.
1379 (The sign bit is not used so there is no confusion.) */
1383 const char *const name
;
1385 const char *const description
;
1387 target_switches
[] = TARGET_SWITCHES
;
1389 /* This table is similar, but allows the switch to have a value. */
1391 #ifdef TARGET_OPTIONS
1394 const char *const prefix
;
1395 const char **const variable
;
1396 const char *const description
;
1398 target_options
[] = TARGET_OPTIONS
;
1401 /* Options controlling warnings. */
1403 /* Don't print warning messages. -w. */
1405 int inhibit_warnings
= 0;
1407 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1409 int warn_system_headers
= 0;
1411 /* Print various extra warnings. -W. */
1413 int extra_warnings
= 0;
1415 /* Treat warnings as errors. -Werror. */
1417 int warnings_are_errors
= 0;
1419 /* Nonzero to warn about unused variables, functions et.al. */
1421 int warn_unused_function
;
1422 int warn_unused_label
;
1423 int warn_unused_parameter
;
1424 int warn_unused_variable
;
1425 int warn_unused_value
;
1428 set_Wunused (setting
)
1431 warn_unused_function
= setting
;
1432 warn_unused_label
= setting
;
1433 /* Unused function parameter warnings are reported when either ``-W
1434 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1435 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1437 warn_unused_parameter
= 0;
1438 else if (!warn_unused_parameter
)
1439 warn_unused_parameter
= -1;
1440 warn_unused_variable
= setting
;
1441 warn_unused_value
= setting
;
1444 /* Nonzero to warn about code which is never reached. */
1446 int warn_notreached
;
1448 /* Nonzero to warn about variables used before they are initialized. */
1450 int warn_uninitialized
;
1452 /* Nonzero means warn about all declarations which shadow others. */
1456 /* Warn if a switch on an enum fails to have a case for every enum value. */
1460 /* Nonzero means warn about function definitions that default the return type
1461 or that use a null return and have a return-type other than void. */
1463 int warn_return_type
;
1465 /* Nonzero means warn about pointer casts that increase the required
1466 alignment of the target type (and might therefore lead to a crash
1467 due to a misaligned access). */
1469 int warn_cast_align
;
1471 /* Nonzero means warn about any objects definitions whose size is larger
1472 than N bytes. Also want about function definitions whose returned
1473 values are larger than N bytes. The value N is in `larger_than_size'. */
1475 int warn_larger_than
;
1476 HOST_WIDE_INT larger_than_size
;
1478 /* Nonzero means warn if inline function is too large. */
1482 /* Warn if a function returns an aggregate,
1483 since there are often incompatible calling conventions for doing this. */
1485 int warn_aggregate_return
;
1487 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1491 /* Warn when gcc pads a structure to an alignment boundary. */
1495 /* Warn when an optimization pass is disabled. */
1497 int warn_disabled_optimization
;
1499 /* Warn about functions which might be candidates for attribute noreturn. */
1501 int warn_missing_noreturn
;
1503 /* Likewise for -W. */
1505 lang_independent_options W_options
[] =
1507 {"unused-function", &warn_unused_function
, 1,
1508 N_("Warn when a function is unused") },
1509 {"unused-label", &warn_unused_label
, 1,
1510 N_("Warn when a label is unused") },
1511 {"unused-parameter", &warn_unused_parameter
, 1,
1512 N_("Warn when a function parameter is unused") },
1513 {"unused-variable", &warn_unused_variable
, 1,
1514 N_("Warn when a variable is unused") },
1515 {"unused-value", &warn_unused_value
, 1,
1516 N_("Warn when an expression value is unused") },
1517 {"system-headers", &warn_system_headers
, 1,
1518 N_("Do not suppress warnings from system headers") },
1519 {"error", &warnings_are_errors
, 1,
1520 N_("Treat all warnings as errors") },
1521 {"shadow", &warn_shadow
, 1,
1522 N_("Warn when one local variable shadows another") },
1523 {"switch", &warn_switch
, 1,
1524 N_("Warn about enumerated switches missing a specific case") },
1525 {"aggregate-return", &warn_aggregate_return
, 1,
1526 N_("Warn about returning structures, unions or arrays") },
1527 {"cast-align", &warn_cast_align
, 1,
1528 N_("Warn about pointer casts which increase alignment") },
1529 {"unreachable-code", &warn_notreached
, 1,
1530 N_("Warn about code that will never be executed") },
1531 {"uninitialized", &warn_uninitialized
, 1,
1532 N_("Warn about unitialized automatic variables") },
1533 {"inline", &warn_inline
, 1,
1534 N_("Warn when an inlined function cannot be inlined") },
1535 {"packed", &warn_packed
, 1,
1536 N_("Warn when the packed attribute has no effect on struct layout") },
1537 {"padded", &warn_padded
, 1,
1538 N_("Warn when padding is required to align struct members") },
1539 {"disabled-optimization", &warn_disabled_optimization
, 1,
1540 N_("Warn when an optimization pass is disabled") },
1541 {"missing-noreturn", &warn_missing_noreturn
, 1,
1542 N_("Warn about functions which might be candidates for attribute noreturn") }
1545 /* The following routines are useful in setting all the flags that
1546 -ffast-math and -fno-fast-math imply. */
1549 set_fast_math_flags ()
1551 flag_trapping_math
= 0;
1552 flag_unsafe_math_optimizations
= 1;
1553 flag_errno_math
= 0;
1557 set_no_fast_math_flags ()
1559 flag_trapping_math
= 1;
1560 flag_unsafe_math_optimizations
= 0;
1561 flag_errno_math
= 1;
1565 /* Output files for assembler code (real compiler output)
1566 and debugging dumps. */
1569 FILE *aux_info_file
;
1570 FILE *rtl_dump_file
= NULL
;
1572 /* Decode the string P as an integral parameter.
1573 If the string is indeed an integer return its numeric value else
1574 issue an Invalid Option error for the option PNAME and return DEFVAL.
1575 If PNAME is zero just return DEFVAL, do not call error. */
1578 read_integral_parameter (p
, pname
, defval
)
1583 const char *endp
= p
;
1587 if (*endp
>= '0' && *endp
<= '9')
1596 error ("Invalid option `%s'", pname
);
1604 /* This is the default decl_printable_name function. */
1607 decl_name (decl
, verbosity
)
1609 int verbosity ATTRIBUTE_UNUSED
;
1611 return IDENTIFIER_POINTER (DECL_NAME (decl
));
1615 /* This calls abort and is used to avoid problems when abort if a macro.
1616 It is used when we need to pass the address of abort. */
1624 /* When `malloc.c' is compiled with `rcheck' defined,
1625 it calls this function to report clobberage. */
1629 const char *s ATTRIBUTE_UNUSED
;
1634 /* Return the logarithm of X, base 2, considering X unsigned,
1635 if X is a power of 2. Otherwise, returns -1.
1637 This should be used via the `exact_log2' macro. */
1641 unsigned HOST_WIDE_INT x
;
1644 /* Test for 0 or a power of 2. */
1645 if (x
== 0 || x
!= (x
& -x
))
1647 while ((x
>>= 1) != 0)
1652 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1653 If X is 0, return -1.
1655 This should be used via the floor_log2 macro. */
1659 unsigned HOST_WIDE_INT x
;
1668 static int float_handler_set
;
1670 jmp_buf float_handler
;
1672 /* Signals actually come here. */
1675 float_signal (signo
)
1676 /* If this is missing, some compilers complain. */
1677 int signo ATTRIBUTE_UNUSED
;
1679 if (float_handled
== 0)
1680 crash_signal (signo
);
1683 /* On System-V derived systems, we must reinstall the signal handler.
1684 This is harmless on BSD-derived systems. */
1685 signal (SIGFPE
, float_signal
);
1686 longjmp (float_handler
, 1);
1689 /* Specify where to longjmp to when a floating arithmetic error happens.
1690 If HANDLER is 0, it means don't handle the errors any more. */
1693 set_float_handler (handler
)
1696 float_handled
= (handler
!= 0);
1698 memcpy (float_handler
, handler
, sizeof (float_handler
));
1700 if (float_handled
&& ! float_handler_set
)
1702 signal (SIGFPE
, float_signal
);
1703 float_handler_set
= 1;
1707 /* This is a wrapper function for code which might elicit an
1708 arithmetic exception. That code should be passed in as a function
1709 pointer FN, and one argument DATA. DATA is usually a struct which
1710 contains the real input and output for function FN. This function
1711 returns 0 (failure) if longjmp was called (i.e. an exception
1712 occured.) It returns 1 (success) otherwise. */
1715 do_float_handler (fn
, data
)
1716 void (*fn
) PARAMS ((PTR
));
1723 /* We got here via longjmp () caused by an exception in function
1725 set_float_handler (NULL
);
1729 set_float_handler (buf
);
1731 set_float_handler (NULL
);
1735 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1736 into ICE messages, which is much more user friendly. */
1739 crash_signal (signo
)
1742 internal_error ("Internal error: %s", strsignal (signo
));
1745 /* Strip off a legitimate source ending from the input string NAME of
1746 length LEN. Rather than having to know the names used by all of
1747 our front ends, we strip off an ending of a period followed by
1748 up to five characters. (Java uses ".class".) */
1751 strip_off_ending (name
, len
)
1756 for (i
= 2; i
< 6 && len
> i
; i
++)
1758 if (name
[len
- i
] == '.')
1760 name
[len
- i
] = '\0';
1766 /* Output a quoted string. */
1769 output_quoted_string (asm_file
, string
)
1773 #ifdef OUTPUT_QUOTED_STRING
1774 OUTPUT_QUOTED_STRING (asm_file
, string
);
1778 putc ('\"', asm_file
);
1779 while ((c
= *string
++) != 0)
1781 if (c
== '\"' || c
== '\\')
1782 putc ('\\', asm_file
);
1785 putc ('\"', asm_file
);
1789 /* Output a file name in the form wanted by System V. */
1792 output_file_directive (asm_file
, input_name
)
1794 const char *input_name
;
1796 int len
= strlen (input_name
);
1797 const char *na
= input_name
+ len
;
1799 /* NA gets INPUT_NAME sans directory names. */
1800 while (na
> input_name
)
1802 if (IS_DIR_SEPARATOR (na
[-1]))
1807 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1808 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1810 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1811 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1813 fprintf (asm_file
, "\t.file\t");
1814 output_quoted_string (asm_file
, na
);
1815 fputc ('\n', asm_file
);
1820 /* Routine to open a dump file. Return true if the dump file is enabled. */
1823 open_dump_file (index
, decl
)
1824 enum dump_file_index index
;
1828 const char *open_arg
;
1831 if (! dump_file
[index
].enabled
)
1834 timevar_push (TV_DUMP
);
1835 if (rtl_dump_file
!= NULL
)
1836 fclose (rtl_dump_file
);
1838 sprintf (seq
, ".%02d.", index
);
1840 if (! dump_file
[index
].initialized
)
1842 /* If we've not initialized the files, do so now. */
1843 if (graph_dump_format
!= no_graph
1844 && dump_file
[index
].graph_dump_p
)
1846 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1847 clean_graph_dump_file (dump_base_name
, dump_name
);
1850 dump_file
[index
].initialized
= 1;
1856 dump_name
= concat (dump_base_name
, seq
,
1857 dump_file
[index
].extension
, NULL
);
1859 rtl_dump_file
= fopen (dump_name
, open_arg
);
1860 if (rtl_dump_file
== NULL
)
1861 fatal_io_error ("can't open %s", dump_name
);
1866 fprintf (rtl_dump_file
, "\n;; Function %s\n\n",
1867 decl_printable_name (decl
, 2));
1869 timevar_pop (TV_DUMP
);
1873 /* Routine to close a dump file. */
1876 close_dump_file (index
, func
, insns
)
1877 enum dump_file_index index
;
1878 void (*func
) PARAMS ((FILE *, rtx
));
1881 if (! rtl_dump_file
)
1884 timevar_push (TV_DUMP
);
1886 && graph_dump_format
!= no_graph
1887 && dump_file
[index
].graph_dump_p
)
1892 sprintf (seq
, ".%02d.", index
);
1893 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1894 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1899 func (rtl_dump_file
, insns
);
1901 fflush (rtl_dump_file
);
1902 fclose (rtl_dump_file
);
1904 rtl_dump_file
= NULL
;
1905 timevar_pop (TV_DUMP
);
1908 /* Do any final processing required for the declarations in VEC, of
1909 which there are LEN. We write out inline functions and variables
1910 that have been deferred until this point, but which are required.
1911 Returns non-zero if anything was put out. */
1914 wrapup_global_declarations (vec
, len
)
1921 int output_something
= 0;
1923 for (i
= 0; i
< len
; i
++)
1927 /* We're not deferring this any longer. */
1928 DECL_DEFER_OUTPUT (decl
) = 0;
1930 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0
1931 && incomplete_decl_finalize_hook
!= 0)
1932 (*incomplete_decl_finalize_hook
) (decl
);
1935 /* Now emit any global variables or functions that we have been
1936 putting off. We need to loop in case one of the things emitted
1937 here references another one which comes earlier in the list. */
1941 for (i
= 0; i
< len
; i
++)
1945 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1948 /* Don't write out static consts, unless we still need them.
1950 We also keep static consts if not optimizing (for debugging),
1951 unless the user specified -fno-keep-static-consts.
1952 ??? They might be better written into the debug information.
1953 This is possible when using DWARF.
1955 A language processor that wants static constants to be always
1956 written out (even if it is not used) is responsible for
1957 calling rest_of_decl_compilation itself. E.g. the C front-end
1958 calls rest_of_decl_compilation from finish_decl.
1959 One motivation for this is that is conventional in some
1960 environments to write things like:
1961 static const char rcsid[] = "... version string ...";
1962 intending to force the string to be in the executable.
1964 A language processor that would prefer to have unneeded
1965 static constants "optimized away" would just defer writing
1966 them out until here. E.g. C++ does this, because static
1967 constants are often defined in header files.
1969 ??? A tempting alternative (for both C and C++) would be
1970 to force a constant to be written if and only if it is
1971 defined in a main file, as opposed to an include file. */
1973 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1974 && (((! TREE_READONLY (decl
) || TREE_PUBLIC (decl
))
1975 && !DECL_COMDAT (decl
))
1977 && flag_keep_static_consts
1978 && !DECL_ARTIFICIAL (decl
))
1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1982 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1985 if (TREE_CODE (decl
) == FUNCTION_DECL
1986 && DECL_INITIAL (decl
) != 0
1987 && DECL_SAVED_INSNS (decl
) != 0
1988 && (flag_keep_inline_functions
1989 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1990 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1993 output_inline_function (decl
);
1998 output_something
= 1;
2002 return output_something
;
2005 /* Issue appropriate warnings for the global declarations in VEC (of
2006 which there are LEN). Output debugging information for them. */
2009 check_global_declarations (vec
, len
)
2016 for (i
= 0; i
< len
; i
++)
2020 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
2021 && ! TREE_ASM_WRITTEN (decl
))
2022 /* Cancel the RTL for this decl so that, if debugging info
2023 output for global variables is still to come,
2024 this one will be omitted. */
2025 SET_DECL_RTL (decl
, NULL_RTX
);
2027 /* Warn about any function
2028 declared static but not defined.
2029 We don't warn about variables,
2030 because many programs have static variables
2031 that exist only to get some text into the object file. */
2032 if (TREE_CODE (decl
) == FUNCTION_DECL
2033 && (warn_unused_function
2034 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2035 && DECL_INITIAL (decl
) == 0
2036 && DECL_EXTERNAL (decl
)
2037 && ! DECL_ARTIFICIAL (decl
)
2038 && ! TREE_PUBLIC (decl
))
2040 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
2041 pedwarn_with_decl (decl
,
2042 "`%s' used but never defined");
2044 warning_with_decl (decl
,
2045 "`%s' declared `static' but never defined");
2046 /* This symbol is effectively an "extern" declaration now. */
2047 TREE_PUBLIC (decl
) = 1;
2048 assemble_external (decl
);
2051 /* Warn about static fns or vars defined but not used,
2052 but not about inline functions or static consts
2053 since defining those in header files is normal practice. */
2054 if (((warn_unused_function
2055 && TREE_CODE (decl
) == FUNCTION_DECL
&& ! DECL_INLINE (decl
))
2056 || (warn_unused_variable
2057 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
2058 && ! DECL_IN_SYSTEM_HEADER (decl
)
2059 && ! DECL_EXTERNAL (decl
)
2060 && ! TREE_PUBLIC (decl
)
2061 && ! TREE_USED (decl
)
2062 && (TREE_CODE (decl
) == FUNCTION_DECL
|| ! DECL_REGISTER (decl
))
2063 /* The TREE_USED bit for file-scope decls
2064 is kept in the identifier, to handle multiple
2065 external decls in different scopes. */
2066 && ! TREE_USED (DECL_NAME (decl
)))
2067 warning_with_decl (decl
, "`%s' defined but not used");
2069 timevar_push (TV_SYMOUT
);
2070 (*debug_hooks
->global_decl
) (decl
);
2071 timevar_pop (TV_SYMOUT
);
2075 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2076 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2077 INPUT_FILENAME and LINENO accordingly. */
2080 push_srcloc (file
, line
)
2084 struct file_stack
*fs
;
2086 if (input_file_stack
)
2088 input_file_stack
->name
= input_filename
;
2089 input_file_stack
->line
= lineno
;
2092 fs
= (struct file_stack
*) xmalloc (sizeof (struct file_stack
));
2093 fs
->name
= input_filename
= file
;
2094 fs
->line
= lineno
= line
;
2095 fs
->indent_level
= 0;
2096 fs
->next
= input_file_stack
;
2097 input_file_stack
= fs
;
2098 input_file_stack_tick
++;
2101 /* Pop the top entry off the stack of presently open source files.
2102 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2108 struct file_stack
*fs
;
2110 fs
= input_file_stack
;
2111 input_file_stack
= fs
->next
;
2113 input_file_stack_tick
++;
2114 /* The initial source file is never popped. */
2115 if (!input_file_stack
)
2117 input_filename
= input_file_stack
->name
;
2118 lineno
= input_file_stack
->line
;
2121 /* Compile an entire translation unit, whose primary source file is
2122 named NAME. Write a file of assembly output and various debugging
2131 int name_specified
= name
!= 0;
2133 if (dump_base_name
== 0)
2134 dump_base_name
= name
? name
: "gccdump";
2139 /* Start timing total execution time. */
2142 timevar_start (TV_TOTAL
);
2144 /* Open assembly code output file. Do this even if -fsyntax-only is on,
2145 because then the driver will have provided the name of a temporary
2146 file or bit bucket for us. */
2148 if (! name_specified
&& asm_file_name
== 0)
2149 asm_out_file
= stdout
;
2152 if (asm_file_name
== 0)
2154 int len
= strlen (dump_base_name
);
2155 char *dumpname
= (char *) xmalloc (len
+ 6);
2156 memcpy (dumpname
, dump_base_name
, len
+ 1);
2157 strip_off_ending (dumpname
, len
);
2158 strcat (dumpname
, ".s");
2159 asm_file_name
= dumpname
;
2161 if (!strcmp (asm_file_name
, "-"))
2162 asm_out_file
= stdout
;
2164 asm_out_file
= fopen (asm_file_name
, "w");
2165 if (asm_out_file
== 0)
2166 fatal_io_error ("can't open %s for writing", asm_file_name
);
2169 /* Initialize data in various passes. */
2172 name
= init_parse (name
);
2173 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2174 || debug_info_level
== DINFO_LEVEL_VERBOSE
2175 || flag_test_coverage
2176 || warn_notreached
);
2179 init_decl_processing ();
2185 init_function_once ();
2186 init_stor_layout_once ();
2187 init_varasm_once ();
2188 init_EXPR_INSN_LIST_cache ();
2190 /* The following initialization functions need to generate rtl, so
2191 provide a dummy function context for them. */
2192 init_dummy_function_start ();
2195 if (flag_caller_saves
)
2196 init_caller_save ();
2197 expand_dummy_function_end ();
2199 /* If auxiliary info generation is desired, open the output file.
2200 This goes in the same directory as the source file--unlike
2201 all the other output files. */
2202 if (flag_gen_aux_info
)
2204 aux_info_file
= fopen (aux_info_file_name
, "w");
2205 if (aux_info_file
== 0)
2206 fatal_io_error ("can't open %s", aux_info_file_name
);
2209 #ifdef IO_BUFFER_SIZE
2210 setvbuf (asm_out_file
, (char *) xmalloc (IO_BUFFER_SIZE
),
2211 _IOFBF
, IO_BUFFER_SIZE
);
2215 name
= ggc_strdup (name
);
2217 input_filename
= name
;
2219 /* Put an entry on the input file stack for the main input file. */
2220 push_srcloc (input_filename
, 0);
2222 /* Perform language-specific initialization.
2223 This may set main_input_filename. */
2224 if (lang_hooks
.init
)
2225 (*lang_hooks
.init
) ();
2227 /* If the input doesn't start with a #line, use the input name
2228 as the official input file name. */
2229 if (main_input_filename
== 0)
2230 main_input_filename
= name
;
2232 if (flag_syntax_only
)
2234 write_symbols
= NO_DEBUG
;
2236 profile_block_flag
= 0;
2240 #ifdef ASM_FILE_START
2241 ASM_FILE_START (asm_out_file
);
2244 #ifdef ASM_COMMENT_START
2245 if (flag_verbose_asm
)
2247 /* Print the list of options in effect. */
2248 print_version (asm_out_file
, ASM_COMMENT_START
);
2249 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2250 ASM_COMMENT_START
, " ", "\n");
2251 /* Add a blank line here so it appears in assembler output but not
2253 fprintf (asm_out_file
, "\n");
2256 } /* ! flag_syntax_only */
2258 /* Set up the debug hooks based on write_symbols. Default to doing
2260 debug_hooks
= &do_nothing_debug_hooks
;
2261 #if defined(DBX_DEBUGGING_INFO)
2262 if (write_symbols
== DBX_DEBUG
)
2263 debug_hooks
= &dbx_debug_hooks
;
2265 #if defined(XCOFF_DEBUGGING_INFO)
2266 if (write_symbols
== XCOFF_DEBUG
)
2267 debug_hooks
= &xcoff_debug_hooks
;
2269 #ifdef SDB_DEBUGGING_INFO
2270 if (write_symbols
== SDB_DEBUG
)
2271 debug_hooks
= &sdb_debug_hooks
;
2273 #ifdef DWARF_DEBUGGING_INFO
2274 if (write_symbols
== DWARF_DEBUG
)
2275 debug_hooks
= &dwarf_debug_hooks
;
2277 #ifdef DWARF2_DEBUGGING_INFO
2278 if (write_symbols
== DWARF2_DEBUG
)
2279 debug_hooks
= &dwarf2_debug_hooks
;
2282 if (! targetm
.have_named_sections
)
2284 if (flag_function_sections
)
2286 warning ("-ffunction-sections not supported for this target.");
2287 flag_function_sections
= 0;
2289 if (flag_data_sections
)
2291 warning ("-fdata-sections not supported for this target.");
2292 flag_data_sections
= 0;
2296 if (flag_function_sections
2297 && (profile_flag
|| profile_block_flag
))
2299 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2300 flag_function_sections
= 0;
2303 #ifndef OBJECT_FORMAT_ELF
2304 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2305 warning ("-ffunction-sections may affect debugging on some targets.");
2308 /* If dbx symbol table desired, initialize writing it
2309 and output the predefined types. */
2310 timevar_push (TV_SYMOUT
);
2311 #ifdef DWARF2_UNWIND_INFO
2312 if (dwarf2out_do_frame ())
2313 dwarf2out_frame_init ();
2316 (*debug_hooks
->init
) (main_input_filename
);
2317 timevar_pop (TV_SYMOUT
);
2319 /* Initialize yet another pass. */
2321 init_final (main_input_filename
);
2322 init_branch_prob (dump_base_name
);
2324 timevar_push (TV_PARSE
);
2326 /* Call the parser, which parses the entire file
2327 (calling rest_of_compilation for each function). */
2330 /* In case there were missing block closers,
2331 get us back to the global binding level. */
2332 while (! global_bindings_p ())
2335 /* Compilation is now finished except for writing
2336 what's left of the symbol table output. */
2338 timevar_pop (TV_PARSE
);
2340 if (flag_syntax_only
)
2343 globals
= getdecls ();
2345 /* Really define vars that have had only a tentative definition.
2346 Really output inline functions that must actually be callable
2347 and have not been output so far. */
2350 int len
= list_length (globals
);
2351 tree
*vec
= (tree
*) xmalloc (sizeof (tree
) * len
);
2355 /* Process the decls in reverse order--earliest first.
2356 Put them into VEC from back to front, then take out from front. */
2358 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
2359 vec
[len
- i
- 1] = decl
;
2361 wrapup_global_declarations (vec
, len
);
2363 /* This must occur after the loop to output deferred functions. Else
2364 the profiler initializer would not be emitted if all the functions
2365 in this compilation unit were deferred.
2367 output_func_start_profiler can not cause any additional functions or
2368 data to need to be output, so it need not be in the deferred function
2370 output_func_start_profiler ();
2372 check_global_declarations (vec
, len
);
2378 /* Write out any pending weak symbol declarations. */
2382 /* Do dbx symbols. */
2383 timevar_push (TV_SYMOUT
);
2385 #ifdef DWARF2_UNWIND_INFO
2386 if (dwarf2out_do_frame ())
2387 dwarf2out_frame_finish ();
2390 (*debug_hooks
->finish
) (main_input_filename
);
2391 timevar_pop (TV_SYMOUT
);
2393 /* Output some stuff at end of file if nec. */
2395 dw2_output_indirect_constants ();
2397 end_final (dump_base_name
);
2399 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2401 timevar_push (TV_DUMP
);
2402 open_dump_file (DFI_bp
, NULL
);
2406 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
2407 timevar_pop (TV_DUMP
);
2411 ASM_FILE_END (asm_out_file
);
2414 /* Attach a special .ident directive to the end of the file to identify
2415 the version of GCC which compiled this code. The format of the .ident
2416 string is patterned after the ones produced by native SVR4 compilers. */
2419 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
2420 IDENT_ASM_OP
, version_string
);
2423 /* Language-specific end of compilation actions. */
2425 if (lang_hooks
.finish
)
2426 (*lang_hooks
.finish
) ();
2428 /* Close the dump files. */
2430 if (flag_gen_aux_info
)
2432 fclose (aux_info_file
);
2434 unlink (aux_info_file_name
);
2437 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
2439 timevar_push (TV_DUMP
);
2440 dump_combine_total_stats (rtl_dump_file
);
2441 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
2442 timevar_pop (TV_DUMP
);
2445 /* Close non-debugging input and output files. Take special care to note
2446 whether fclose returns an error, since the pages might still be on the
2447 buffer chain while the file is open. */
2451 if (ferror (asm_out_file
) != 0)
2452 fatal_io_error ("error writing to %s", asm_file_name
);
2453 if (fclose (asm_out_file
) != 0)
2454 fatal_io_error ("error closing %s", asm_file_name
);
2456 /* Do whatever is necessary to finish printing the graphs. */
2457 if (graph_dump_format
!= no_graph
)
2461 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
2462 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
2467 sprintf (seq
, ".%02d.", i
);
2468 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
2469 finish_graph_dump_file (dump_base_name
, suffix
);
2476 ggc_print_statistics ();
2477 stringpool_statistics ();
2480 /* Free up memory for the benefit of leak detectors. */
2483 /* Stop timing total execution time. */
2484 timevar_stop (TV_TOTAL
);
2486 /* Print the times. */
2488 timevar_print (stderr
);
2491 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2492 and TYPE_DECL nodes.
2494 This does nothing for local (non-static) variables, unless the
2495 variable is a register variable with an ASMSPEC. In that case, or
2496 if the variable is not an automatic, it sets up the RTL and
2497 outputs any assembler code (label definition, storage allocation
2498 and initialization).
2500 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2501 the assembler symbol name to be used. TOP_LEVEL is nonzero
2502 if this declaration is not within a function. */
2505 rest_of_decl_compilation (decl
, asmspec
, top_level
, at_end
)
2507 const char *asmspec
;
2511 /* Declarations of variables, and of functions defined elsewhere. */
2513 /* The most obvious approach, to put an #ifndef around where
2514 this macro is used, doesn't work since it's inside a macro call. */
2515 #ifndef ASM_FINISH_DECLARE_OBJECT
2516 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2519 /* Forward declarations for nested functions are not "external",
2520 but we need to treat them as if they were. */
2521 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
2522 || TREE_CODE (decl
) == FUNCTION_DECL
)
2524 timevar_push (TV_VARCONST
);
2526 make_decl_rtl (decl
, asmspec
);
2527 /* Don't output anything
2528 when a tentative file-scope definition is seen.
2529 But at end of compilation, do output code for them. */
2530 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
2531 assemble_variable (decl
, top_level
, at_end
, 0);
2532 if (decl
== last_assemble_variable_decl
)
2534 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
2537 timevar_pop (TV_VARCONST
);
2539 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
2541 if (decode_reg_name (asmspec
) >= 0)
2543 SET_DECL_RTL (decl
, NULL_RTX
);
2544 make_decl_rtl (decl
, asmspec
);
2548 error ("invalid register name `%s' for register variable", asmspec
);
2549 DECL_REGISTER (decl
) = 0;
2554 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2555 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2556 && TREE_CODE (decl
) == TYPE_DECL
)
2558 timevar_push (TV_SYMOUT
);
2559 dbxout_symbol (decl
, 0);
2560 timevar_pop (TV_SYMOUT
);
2563 #ifdef SDB_DEBUGGING_INFO
2564 else if (write_symbols
== SDB_DEBUG
&& top_level
2565 && TREE_CODE (decl
) == TYPE_DECL
)
2567 timevar_push (TV_SYMOUT
);
2568 sdbout_symbol (decl
, 0);
2569 timevar_pop (TV_SYMOUT
);
2574 /* Called after finishing a record, union or enumeral type. */
2577 rest_of_type_compilation (type
, toplev
)
2578 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2582 tree type ATTRIBUTE_UNUSED
;
2583 int toplev ATTRIBUTE_UNUSED
;
2586 timevar_push (TV_SYMOUT
);
2587 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2588 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
2589 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2591 #ifdef SDB_DEBUGGING_INFO
2592 if (write_symbols
== SDB_DEBUG
)
2593 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
2595 #ifdef DWARF2_DEBUGGING_INFO
2596 if (write_symbols
== DWARF2_DEBUG
&& toplev
)
2597 dwarf2out_decl (TYPE_STUB_DECL (type
));
2599 timevar_pop (TV_SYMOUT
);
2602 /* This is called from finish_function (within yyparse)
2603 after each top-level definition is parsed.
2604 It is supposed to compile that function or variable
2605 and output the assembler code for it.
2606 After we return, the tree storage is freed. */
2609 rest_of_compilation (decl
)
2615 int rebuild_label_notes_after_reload
;
2616 int register_life_up_to_date
;
2618 timevar_push (TV_REST_OF_COMPILATION
);
2620 /* Now that we're out of the frontend, we shouldn't have any more
2621 CONCATs anywhere. */
2622 generating_concat_p
= 0;
2624 /* When processing delayed functions, prepare_function_start() won't
2625 have been run to re-initialize it. */
2626 cse_not_expected
= ! optimize
;
2628 /* First, make sure that NOTE_BLOCK is set correctly for each
2629 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2630 if (!cfun
->x_whole_function_mode_p
)
2633 /* Then remove any notes we don't need. That will make iterating
2634 over the instruction sequence faster, and allow the garbage
2635 collector to reclaim the memory used by the notes. */
2636 remove_unnecessary_notes ();
2638 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2639 tree in sensible shape. So, we just recalculate it here. */
2640 if (cfun
->x_whole_function_mode_p
)
2645 /* If we are reconsidering an inline function
2646 at the end of compilation, skip the stuff for making it inline. */
2648 if (DECL_SAVED_INSNS (decl
) == 0)
2654 /* If this is nested inside an inlined external function, pretend
2655 it was only declared. Since we cannot inline such functions,
2656 generating code for this one is not only not necessary but will
2657 confuse some debugging output writers. */
2658 for (parent
= DECL_CONTEXT (current_function_decl
);
2659 parent
!= NULL_TREE
;
2660 parent
= get_containing_scope (parent
))
2661 if (TREE_CODE (parent
) == FUNCTION_DECL
2662 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2664 DECL_INITIAL (decl
) = 0;
2665 goto exit_rest_of_compilation
;
2668 /* If requested, consider whether to make this function inline. */
2669 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2670 || flag_inline_functions
)
2672 timevar_push (TV_INTEGRATION
);
2673 lose
= function_cannot_inline_p (decl
);
2674 timevar_pop (TV_INTEGRATION
);
2675 if (lose
|| ! optimize
)
2677 if (warn_inline
&& DECL_INLINE (decl
))
2678 warning_with_decl (decl
, lose
);
2679 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2680 /* Don't really compile an extern inline function.
2681 If we can't make it inline, pretend
2682 it was only declared. */
2683 if (DECL_EXTERNAL (decl
))
2685 DECL_INITIAL (decl
) = 0;
2686 goto exit_rest_of_compilation
;
2690 /* ??? Note that this has the effect of making it look
2691 like "inline" was specified for a function if we choose
2692 to inline it. This isn't quite right, but it's
2693 probably not worth the trouble to fix. */
2694 inlinable
= DECL_INLINE (decl
) = 1;
2697 insns
= get_insns ();
2699 /* Dump the rtl code if we are dumping rtl. */
2701 if (open_dump_file (DFI_rtl
, decl
))
2703 if (DECL_SAVED_INSNS (decl
))
2704 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2705 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2708 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2709 sorts of eh initialization. Delay this until after the
2710 initial rtl dump so that we can see the original nesting. */
2711 convert_from_eh_region_ranges ();
2713 /* If function is inline, and we don't yet know whether to
2714 compile it by itself, defer decision till end of compilation.
2715 finish_compilation will call rest_of_compilation again
2716 for those functions that need to be output. Also defer those
2717 functions that we are supposed to defer. */
2720 || (DECL_INLINE (decl
)
2721 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2722 && ! flag_keep_inline_functions
)
2723 || DECL_EXTERNAL (decl
))))
2724 DECL_DEFER_OUTPUT (decl
) = 1;
2726 if (DECL_INLINE (decl
))
2727 /* DWARF wants separate debugging info for abstract and
2728 concrete instances of all inline functions, including those
2729 declared inline but not inlined, and those inlined even
2730 though they weren't declared inline. Conveniently, that's
2731 what DECL_INLINE means at this point. */
2732 (*debug_hooks
->deferred_inline_function
) (decl
);
2734 if (DECL_DEFER_OUTPUT (decl
))
2736 /* If -Wreturn-type, we have to do a bit of compilation. We just
2737 want to call cleanup the cfg to figure out whether or not we can
2738 fall off the end of the function; we do the minimum amount of
2739 work necessary to make that safe. */
2740 if (warn_return_type
)
2742 int saved_optimize
= optimize
;
2745 rebuild_jump_labels (insns
);
2746 find_exception_handler_labels ();
2747 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2748 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2749 optimize
= saved_optimize
;
2751 /* CFG is no longer maitained up-to-date. */
2752 free_bb_for_insn ();
2755 current_function_nothrow
= nothrow_function_p ();
2756 if (current_function_nothrow
)
2757 /* Now we know that this can't throw; set the flag for the benefit
2758 of other functions later in this translation unit. */
2759 TREE_NOTHROW (current_function_decl
) = 1;
2761 timevar_push (TV_INTEGRATION
);
2762 save_for_inline (decl
);
2763 timevar_pop (TV_INTEGRATION
);
2764 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2765 goto exit_rest_of_compilation
;
2768 /* If specified extern inline but we aren't inlining it, we are
2769 done. This goes for anything that gets here with DECL_EXTERNAL
2770 set, not just things with DECL_INLINE. */
2771 if (DECL_EXTERNAL (decl
))
2772 goto exit_rest_of_compilation
;
2777 /* Initialize some variables used by the optimizers. */
2778 init_function_for_compilation ();
2780 if (! DECL_DEFER_OUTPUT (decl
))
2781 TREE_ASM_WRITTEN (decl
) = 1;
2783 /* Now that integrate will no longer see our rtl, we need not
2784 distinguish between the return value of this function and the
2785 return value of called functions. Also, we can remove all SETs
2786 of subregs of hard registers; they are only here because of
2787 integrate. Also, we can now initialize pseudos intended to
2788 carry magic hard reg data throughout the function. */
2789 rtx_equal_function_value_matters
= 0;
2790 purge_hard_subreg_sets (get_insns ());
2791 emit_initial_value_sets ();
2793 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2794 if ((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
2795 goto exit_rest_of_compilation
;
2797 /* We may have potential sibling or tail recursion sites. Select one
2798 (of possibly multiple) methods of performing the call. */
2799 if (flag_optimize_sibling_calls
)
2801 timevar_push (TV_JUMP
);
2802 open_dump_file (DFI_sibling
, decl
);
2804 optimize_sibling_and_tail_recursive_calls ();
2806 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2807 timevar_pop (TV_JUMP
);
2810 /* Complete generation of exception handling code. */
2811 find_exception_handler_labels ();
2814 timevar_push (TV_JUMP
);
2815 open_dump_file (DFI_eh
, decl
);
2817 finish_eh_generation ();
2819 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
2820 timevar_pop (TV_JUMP
);
2824 /* If we are doing position-independent code generation, now
2825 is the time to output special prologues and epilogues.
2826 We do not want to do this earlier, because it just clutters
2827 up inline functions with meaningless insns. */
2832 insns
= get_insns ();
2834 /* Copy any shared structure that should not be shared. */
2835 unshare_all_rtl (current_function_decl
, insns
);
2837 #ifdef SETJMP_VIA_SAVE_AREA
2838 /* This must be performed before virtual register instantiation. */
2839 if (current_function_calls_alloca
)
2840 optimize_save_area_alloca (insns
);
2843 /* Instantiate all virtual registers. */
2844 instantiate_virtual_regs (current_function_decl
, insns
);
2846 open_dump_file (DFI_jump
, decl
);
2848 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2849 are initialized and to compute whether control can drop off the end
2852 timevar_push (TV_JUMP
);
2853 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2854 before jump optimization switches branch directions. */
2855 expected_value_to_br_prob ();
2857 reg_scan (insns
, max_reg_num (), 0);
2858 rebuild_jump_labels (insns
);
2859 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2860 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
);
2862 /* CFG is no longer maitained up-to-date. */
2863 free_bb_for_insn ();
2864 copy_loop_headers (insns
);
2865 purge_line_number_notes (insns
);
2867 timevar_pop (TV_JUMP
);
2869 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2870 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
2872 close_dump_file (DFI_jump
, print_rtl
, insns
);
2873 goto exit_rest_of_compilation
;
2876 /* Long term, this should probably move before the jump optimizer too,
2877 but I didn't want to disturb the rtl_dump_and_exit and related
2878 stuff at this time. */
2879 if (optimize
> 0 && flag_ssa
)
2881 /* Convert to SSA form. */
2883 timevar_push (TV_TO_SSA
);
2884 open_dump_file (DFI_ssa
, decl
);
2886 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2887 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2890 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2891 timevar_pop (TV_TO_SSA
);
2893 /* Perform sparse conditional constant propagation, if requested. */
2896 timevar_push (TV_SSA_CCP
);
2897 open_dump_file (DFI_ssa_ccp
, decl
);
2901 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2902 timevar_pop (TV_SSA_CCP
);
2905 /* It would be useful to cleanup the CFG at this point, but block
2906 merging and possibly other transformations might leave a PHI
2907 node in the middle of a basic block, which is a strict no-no. */
2909 /* The SSA implementation uses basic block numbers in its phi
2910 nodes. Thus, changing the control-flow graph or the basic
2911 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2912 may cause problems. */
2916 /* Remove dead code. */
2918 timevar_push (TV_SSA_DCE
);
2919 open_dump_file (DFI_ssa_dce
, decl
);
2921 insns
= get_insns ();
2922 ssa_eliminate_dead_code();
2924 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2925 timevar_pop (TV_SSA_DCE
);
2928 /* Convert from SSA form. */
2930 timevar_push (TV_FROM_SSA
);
2931 open_dump_file (DFI_ussa
, decl
);
2933 convert_from_ssa ();
2934 /* New registers have been created. Rescan their usage. */
2935 reg_scan (insns
, max_reg_num (), 1);
2936 /* Life analysis used in SSA adds log_links but these
2937 shouldn't be there until the flow stage, so clear
2939 clear_log_links (insns
);
2941 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2942 timevar_pop (TV_FROM_SSA
);
2945 /* CFG is no longer maitained up-to-date. */
2946 free_bb_for_insn ();
2949 timevar_push (TV_JUMP
);
2953 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2954 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2956 /* ??? Run if-conversion before delete_null_pointer_checks,
2957 since the later does not preserve the CFG. This should
2958 be changed -- no since converting if's that are going to
2960 timevar_push (TV_IFCVT
);
2962 timevar_pop (TV_IFCVT
);
2964 /* CFG is no longer maitained up-to-date. */
2965 free_bb_for_insn ();
2966 /* Try to identify useless null pointer tests and delete them. */
2967 if (flag_delete_null_pointer_checks
)
2968 delete_null_pointer_checks (insns
);
2971 /* Jump optimization, and the removal of NULL pointer checks, may
2972 have reduced the number of instructions substantially. CSE, and
2973 future passes, allocate arrays whose dimensions involve the
2974 maximum instruction UID, so if we can reduce the maximum UID
2975 we'll save big on memory. */
2976 renumber_insns (rtl_dump_file
);
2977 timevar_pop (TV_JUMP
);
2979 close_dump_file (DFI_jump
, print_rtl
, insns
);
2983 /* Perform common subexpression elimination.
2984 Nonzero value from `cse_main' means that jumps were simplified
2985 and some code may now be unreachable, so do
2986 jump optimization again. */
2990 open_dump_file (DFI_cse
, decl
);
2991 timevar_push (TV_CSE
);
2993 reg_scan (insns
, max_reg_num (), 1);
2995 if (flag_thread_jumps
)
2997 timevar_push (TV_JUMP
);
2998 thread_jumps (insns
, max_reg_num (), 1);
2999 timevar_pop (TV_JUMP
);
3002 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3004 /* If we are not running more CSE passes, then we are no longer
3005 expecting CSE to be run. But always rerun it in a cheap mode. */
3006 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
3008 if (tem
|| optimize
> 1)
3010 timevar_push (TV_JUMP
);
3011 rebuild_jump_labels (insns
);
3012 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3013 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3014 timevar_pop (TV_JUMP
);
3015 /* CFG is no longer maitained up-to-date. */
3016 free_bb_for_insn ();
3019 /* Run this after jump optmizations remove all the unreachable code
3020 so that unreachable code will not keep values live. */
3021 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3023 /* Try to identify useless null pointer tests and delete them. */
3024 if (flag_delete_null_pointer_checks
)
3026 timevar_push (TV_JUMP
);
3027 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3029 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3031 delete_null_pointer_checks (insns
);
3032 /* CFG is no longer maitained up-to-date. */
3033 free_bb_for_insn ();
3034 timevar_pop (TV_JUMP
);
3037 /* The second pass of jump optimization is likely to have
3038 removed a bunch more instructions. */
3039 renumber_insns (rtl_dump_file
);
3041 timevar_pop (TV_CSE
);
3042 close_dump_file (DFI_cse
, print_rtl
, insns
);
3045 open_dump_file (DFI_addressof
, decl
);
3047 purge_addressof (insns
);
3048 reg_scan (insns
, max_reg_num (), 1);
3050 close_dump_file (DFI_addressof
, print_rtl
, insns
);
3054 /* Perform global cse. */
3056 if (optimize
> 0 && flag_gcse
)
3058 int save_csb
, save_cfj
;
3061 timevar_push (TV_GCSE
);
3062 open_dump_file (DFI_gcse
, decl
);
3064 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3065 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3066 tem
= gcse_main (insns
, rtl_dump_file
);
3068 save_csb
= flag_cse_skip_blocks
;
3069 save_cfj
= flag_cse_follow_jumps
;
3070 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
3072 /* CFG is no longer maitained up-to-date. */
3073 free_bb_for_insn ();
3074 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3076 if (flag_expensive_optimizations
)
3078 timevar_push (TV_CSE
);
3079 reg_scan (insns
, max_reg_num (), 1);
3080 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3081 timevar_pop (TV_CSE
);
3082 cse_not_expected
= !flag_rerun_cse_after_loop
;
3085 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3086 things up. Then possibly re-run CSE again. */
3090 timevar_push (TV_JUMP
);
3091 rebuild_jump_labels (insns
);
3092 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3093 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3094 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3095 /* CFG is no longer maitained up-to-date. */
3096 free_bb_for_insn ();
3097 timevar_pop (TV_JUMP
);
3099 if (flag_expensive_optimizations
)
3101 timevar_push (TV_CSE
);
3102 reg_scan (insns
, max_reg_num (), 1);
3103 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
3104 timevar_pop (TV_CSE
);
3108 close_dump_file (DFI_gcse
, print_rtl
, insns
);
3109 timevar_pop (TV_GCSE
);
3112 flag_cse_skip_blocks
= save_csb
;
3113 flag_cse_follow_jumps
= save_cfj
;
3116 /* Move constant computations out of loops. */
3120 timevar_push (TV_LOOP
);
3121 open_dump_file (DFI_loop
, decl
);
3122 free_bb_for_insn ();
3124 if (flag_rerun_loop_opt
)
3126 cleanup_barriers ();
3128 /* We only want to perform unrolling once. */
3130 loop_optimize (insns
, rtl_dump_file
, 0);
3132 /* The first call to loop_optimize makes some instructions
3133 trivially dead. We delete those instructions now in the
3134 hope that doing so will make the heuristics in loop work
3135 better and possibly speed up compilation. */
3136 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3138 /* The regscan pass is currently necessary as the alias
3139 analysis code depends on this information. */
3140 reg_scan (insns
, max_reg_num (), 1);
3142 cleanup_barriers ();
3143 loop_optimize (insns
, rtl_dump_file
,
3144 (flag_unroll_loops
? LOOP_UNROLL
: 0) | LOOP_BCT
);
3146 close_dump_file (DFI_loop
, print_rtl
, insns
);
3147 timevar_pop (TV_LOOP
);
3154 timevar_push (TV_CSE2
);
3155 open_dump_file (DFI_cse2
, decl
);
3157 if (flag_rerun_cse_after_loop
)
3159 /* Running another jump optimization pass before the second
3160 cse pass sometimes simplifies the RTL enough to allow
3161 the second CSE pass to do a better job. Jump_optimize can change
3162 max_reg_num so we must rerun reg_scan afterwards.
3163 ??? Rework to not call reg_scan so often. */
3164 timevar_push (TV_JUMP
);
3166 /* The previous call to loop_optimize makes some instructions
3167 trivially dead. We delete those instructions now in the
3168 hope that doing so will make the heuristics in jump work
3169 better and possibly speed up compilation. */
3170 delete_trivially_dead_insns (insns
, max_reg_num (), 0);
3172 reg_scan (insns
, max_reg_num (), 0);
3174 timevar_push (TV_IFCVT
);
3176 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3177 cleanup_cfg (CLEANUP_EXPENSIVE
);
3180 timevar_pop(TV_IFCVT
);
3182 timevar_pop (TV_JUMP
);
3184 /* CFG is no longer maitained up-to-date. */
3185 free_bb_for_insn ();
3186 reg_scan (insns
, max_reg_num (), 0);
3187 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
3191 timevar_push (TV_JUMP
);
3192 rebuild_jump_labels (insns
);
3193 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3194 cleanup_cfg (CLEANUP_EXPENSIVE
);
3195 /* CFG is no longer maitained up-to-date. */
3196 free_bb_for_insn ();
3197 timevar_pop (TV_JUMP
);
3201 if (flag_thread_jumps
)
3203 /* This pass of jump threading straightens out code
3204 that was kinked by loop optimization. */
3205 timevar_push (TV_JUMP
);
3206 reg_scan (insns
, max_reg_num (), 0);
3207 thread_jumps (insns
, max_reg_num (), 0);
3208 timevar_pop (TV_JUMP
);
3211 close_dump_file (DFI_cse2
, print_rtl
, insns
);
3212 timevar_pop (TV_CSE2
);
3217 cse_not_expected
= 1;
3221 /* Do control and data flow analysis; wrote some of the results to
3224 timevar_push (TV_FLOW
);
3225 open_dump_file (DFI_cfg
, decl
);
3227 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3228 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3229 check_function_return_warnings ();
3231 /* It may make more sense to mark constant functions after dead code is
3232 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3233 may insert code making function non-constant, but we still must consider
3234 it as constant, otherwise -fbranch-probabilities will not read data back.
3236 life_analyzis rarely eliminates modification of external memory.
3238 mark_constant_function ();
3240 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
3242 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3244 timevar_push (TV_BRANCH_PROB
);
3245 open_dump_file (DFI_bp
, decl
);
3249 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
3250 timevar_pop (TV_BRANCH_PROB
);
3253 open_dump_file (DFI_life
, decl
);
3258 /* Discover and record the loop depth at the head of each basic
3259 block. The loop infrastructure does the real job for us. */
3260 flow_loops_find (&loops
, LOOP_TREE
);
3262 /* Estimate using heuristics if no profiling info is available. */
3263 if (flag_guess_branch_prob
)
3264 estimate_probability (&loops
);
3267 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
3269 flow_loops_free (&loops
);
3271 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3272 timevar_pop (TV_FLOW
);
3276 if (warn_uninitialized
|| extra_warnings
)
3278 uninitialized_vars_warning (DECL_INITIAL (decl
));
3280 setjmp_args_warning ();
3283 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
3287 /* If -opt, try combining insns through substitution. */
3291 int rebuild_jump_labels_after_combine
= 0;
3293 timevar_push (TV_COMBINE
);
3294 open_dump_file (DFI_combine
, decl
);
3296 rebuild_jump_labels_after_combine
3297 = combine_instructions (insns
, max_reg_num ());
3299 /* Always purge dead edges, as we may eliminate an insn throwing
3301 rebuild_jump_labels_after_combine
|= purge_all_dead_edges ();
3303 /* Combining insns may have turned an indirect jump into a
3304 direct jump. Rebuid the JUMP_LABEL fields of jumping
3306 if (rebuild_jump_labels_after_combine
)
3308 timevar_push (TV_JUMP
);
3309 rebuild_jump_labels (insns
);
3310 timevar_pop (TV_JUMP
);
3312 timevar_push (TV_FLOW
);
3313 cleanup_cfg (CLEANUP_EXPENSIVE
);
3315 /* Blimey. We've got to have the CFG up to date for the call to
3316 if_convert below. However, the random deletion of blocks
3317 without updating life info can wind up with Wierd Stuff in
3318 global_live_at_end. We then run sched1, which updates things
3319 properly, discovers the wierdness and aborts. */
3320 allocate_bb_life_data ();
3321 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
3322 PROP_DEATH_NOTES
| PROP_KILL_DEAD_CODE
3323 | PROP_SCAN_DEAD_CODE
);
3325 timevar_pop (TV_FLOW
);
3328 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
3329 timevar_pop (TV_COMBINE
);
3334 /* Rerun if-conversion, as combine may have simplified things enough to
3335 now meet sequence length restrictions. */
3338 timevar_push (TV_IFCVT
);
3339 open_dump_file (DFI_ce
, decl
);
3345 close_dump_file (DFI_ce
, print_rtl_with_bb
, insns
);
3346 timevar_pop (TV_IFCVT
);
3349 /* Register allocation pre-pass, to reduce number of moves
3350 necessary for two-address machines. */
3351 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3353 timevar_push (TV_REGMOVE
);
3354 open_dump_file (DFI_regmove
, decl
);
3356 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
3358 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
3359 timevar_pop (TV_REGMOVE
);
3364 /* Do unconditional splitting before register allocation to allow machine
3365 description to add extra information not needed previously. */
3366 split_all_insns (1);
3368 /* Any of the several passes since flow1 will have munged register
3369 lifetime data a bit. */
3370 register_life_up_to_date
= 0;
3372 #ifdef OPTIMIZE_MODE_SWITCHING
3373 timevar_push (TV_GCSE
);
3376 if (optimize_mode_switching (NULL
))
3378 /* We did work, and so had to regenerate global life information.
3379 Take advantage of this and don't re-recompute register life
3380 information below. */
3381 register_life_up_to_date
= 1;
3385 timevar_pop (TV_GCSE
);
3388 timevar_push (TV_SCHED
);
3390 #ifdef INSN_SCHEDULING
3392 /* Print function header into sched dump now
3393 because doing the sched analysis makes some of the dump. */
3394 if (optimize
> 0 && flag_schedule_insns
)
3396 open_dump_file (DFI_sched
, decl
);
3398 /* Do control and data sched analysis,
3399 and write some of the results to dump file. */
3401 schedule_insns (rtl_dump_file
);
3403 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
3405 /* Register lifetime information was updated as part of verifying
3407 register_life_up_to_date
= 1;
3410 timevar_pop (TV_SCHED
);
3414 /* Determine if the current function is a leaf before running reload
3415 since this can impact optimizations done by the prologue and
3416 epilogue thus changing register elimination offsets. */
3417 current_function_is_leaf
= leaf_function_p ();
3419 timevar_push (TV_LOCAL_ALLOC
);
3420 open_dump_file (DFI_lreg
, decl
);
3422 /* Allocate pseudo-regs that are used only within 1 basic block.
3424 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3425 jump optimizer after register allocation and reloading are finished. */
3427 if (! register_life_up_to_date
)
3428 recompute_reg_usage (insns
, ! optimize_size
);
3430 /* Allocate the reg_renumber array. */
3431 allocate_reg_info (max_regno
, FALSE
, TRUE
);
3433 /* And the reg_equiv_memory_loc array. */
3434 reg_equiv_memory_loc
= (rtx
*) xcalloc (max_regno
, sizeof (rtx
));
3436 allocate_initial_values (reg_equiv_memory_loc
);
3438 regclass (insns
, max_reg_num (), rtl_dump_file
);
3439 rebuild_label_notes_after_reload
= local_alloc ();
3441 timevar_pop (TV_LOCAL_ALLOC
);
3443 if (dump_file
[DFI_lreg
].enabled
)
3445 timevar_push (TV_DUMP
);
3447 dump_flow_info (rtl_dump_file
);
3448 dump_local_alloc (rtl_dump_file
);
3450 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
3451 timevar_pop (TV_DUMP
);
3456 timevar_push (TV_GLOBAL_ALLOC
);
3457 open_dump_file (DFI_greg
, decl
);
3459 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3460 pass fixing up any insns that are invalid. */
3463 failure
= global_alloc (rtl_dump_file
);
3466 build_insn_chain (insns
);
3467 failure
= reload (insns
, 0);
3470 timevar_pop (TV_GLOBAL_ALLOC
);
3472 if (dump_file
[DFI_greg
].enabled
)
3474 timevar_push (TV_DUMP
);
3476 dump_global_regs (rtl_dump_file
);
3478 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
3479 timevar_pop (TV_DUMP
);
3483 goto exit_rest_of_compilation
;
3487 open_dump_file (DFI_postreload
, decl
);
3489 /* Do a very simple CSE pass over just the hard registers. */
3492 timevar_push (TV_RELOAD_CSE_REGS
);
3493 reload_cse_regs (insns
);
3494 timevar_pop (TV_RELOAD_CSE_REGS
);
3497 /* Register allocation and reloading may have turned an indirect jump into
3498 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3499 jumping instructions. */
3500 if (rebuild_label_notes_after_reload
)
3502 timevar_push (TV_JUMP
);
3504 rebuild_jump_labels (insns
);
3506 timevar_pop (TV_JUMP
);
3509 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3511 /* Re-create the death notes which were deleted during reload. */
3512 timevar_push (TV_FLOW2
);
3513 open_dump_file (DFI_flow2
, decl
);
3515 #ifdef ENABLE_CHECKING
3516 verify_flow_info ();
3519 /* If optimizing, then go ahead and split insns now. */
3521 split_all_insns (0);
3523 cleanup_cfg (optimize
? CLEANUP_EXPENSIVE
: 0);
3525 /* On some machines, the prologue and epilogue code, or parts thereof,
3526 can be represented as RTL. Doing so lets us schedule insns between
3527 it and the rest of the code and also allows delayed branch
3528 scheduling to operate in the epilogue. */
3529 thread_prologue_and_epilogue_insns (insns
);
3533 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_CROSSJUMP
);
3534 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3536 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3537 even for machines with possibly nonzero RETURN_POPS_ARGS
3538 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3539 push instructions will have popping returns. */
3540 #ifndef PUSH_ROUNDING
3541 if (!ACCUMULATE_OUTGOING_ARGS
)
3543 combine_stack_adjustments ();
3548 flow2_completed
= 1;
3550 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3551 timevar_pop (TV_FLOW2
);
3553 #ifdef HAVE_peephole2
3554 if (optimize
> 0 && flag_peephole2
)
3556 timevar_push (TV_PEEPHOLE2
);
3557 open_dump_file (DFI_peephole2
, decl
);
3559 peephole2_optimize (rtl_dump_file
);
3561 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3562 timevar_pop (TV_PEEPHOLE2
);
3566 if (optimize
> 0 && flag_rename_registers
)
3568 timevar_push (TV_RENAME_REGISTERS
);
3569 open_dump_file (DFI_rnreg
, decl
);
3571 regrename_optimize ();
3573 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
3574 timevar_pop (TV_RENAME_REGISTERS
);
3579 timevar_push (TV_IFCVT2
);
3580 open_dump_file (DFI_ce2
, decl
);
3584 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
3585 timevar_pop (TV_IFCVT2
);
3589 split_all_insns (1);
3592 #ifdef INSN_SCHEDULING
3593 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3595 timevar_push (TV_SCHED2
);
3596 open_dump_file (DFI_sched2
, decl
);
3598 /* Do control and data sched analysis again,
3599 and write some more of the results to dump file. */
3601 split_all_insns (1);
3603 schedule_insns (rtl_dump_file
);
3605 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
3606 timevar_pop (TV_SCHED2
);
3612 #ifdef LEAF_REGISTERS
3613 current_function_uses_only_leaf_regs
3614 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3618 timevar_push (TV_REG_STACK
);
3619 open_dump_file (DFI_stack
, decl
);
3621 reg_to_stack (insns
, rtl_dump_file
);
3623 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
3624 timevar_pop (TV_REG_STACK
);
3630 timevar_push (TV_REORDER_BLOCKS
);
3631 open_dump_file (DFI_bbro
, decl
);
3633 /* Last attempt to optimize CFG, as life analyzis possibly removed
3634 some instructions. */
3635 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
3636 | CLEANUP_CROSSJUMP
);
3637 if (flag_reorder_blocks
)
3639 reorder_basic_blocks ();
3640 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
3643 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
3644 timevar_pop (TV_REORDER_BLOCKS
);
3646 compute_alignments ();
3648 /* CFG is no longer maitained up-to-date. */
3649 free_bb_for_insn ();
3651 /* If a machine dependent reorganization is needed, call it. */
3652 #ifdef MACHINE_DEPENDENT_REORG
3653 timevar_push (TV_MACH_DEP
);
3654 open_dump_file (DFI_mach
, decl
);
3656 MACHINE_DEPENDENT_REORG (insns
);
3658 close_dump_file (DFI_mach
, print_rtl
, insns
);
3659 timevar_pop (TV_MACH_DEP
);
3664 purge_line_number_notes (insns
);
3665 cleanup_barriers ();
3667 /* If a scheduling pass for delayed branches is to be done,
3668 call the scheduling code. */
3671 if (optimize
> 0 && flag_delayed_branch
)
3673 timevar_push (TV_DBR_SCHED
);
3674 open_dump_file (DFI_dbr
, decl
);
3676 dbr_schedule (insns
, rtl_dump_file
);
3678 close_dump_file (DFI_dbr
, print_rtl
, insns
);
3679 timevar_pop (TV_DBR_SCHED
);
3685 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3686 timevar_push (TV_SHORTEN_BRANCH
);
3687 split_all_insns_noflow ();
3688 timevar_pop (TV_SHORTEN_BRANCH
);
3691 convert_to_eh_region_ranges ();
3693 /* Shorten branches. */
3694 timevar_push (TV_SHORTEN_BRANCH
);
3695 shorten_branches (get_insns ());
3696 timevar_pop (TV_SHORTEN_BRANCH
);
3698 current_function_nothrow
= nothrow_function_p ();
3699 if (current_function_nothrow
)
3700 /* Now we know that this can't throw; set the flag for the benefit
3701 of other functions later in this translation unit. */
3702 TREE_NOTHROW (current_function_decl
) = 1;
3704 /* Now turn the rtl into assembler code. */
3706 timevar_push (TV_FINAL
);
3711 /* Get the function's name, as described by its RTL. This may be
3712 different from the DECL_NAME name used in the source file. */
3714 x
= DECL_RTL (decl
);
3715 if (GET_CODE (x
) != MEM
)
3718 if (GET_CODE (x
) != SYMBOL_REF
)
3720 fnname
= XSTR (x
, 0);
3722 assemble_start_function (decl
, fnname
);
3723 final_start_function (insns
, asm_out_file
, optimize
);
3724 final (insns
, asm_out_file
, optimize
, 0);
3725 final_end_function ();
3727 #ifdef IA64_UNWIND_INFO
3728 /* ??? The IA-64 ".handlerdata" directive must be issued before
3729 the ".endp" directive that closes the procedure descriptor. */
3730 output_function_exception_table ();
3733 assemble_end_function (decl
, fnname
);
3735 #ifndef IA64_UNWIND_INFO
3736 /* Otherwise, it feels unclean to switch sections in the middle. */
3737 output_function_exception_table ();
3741 fflush (asm_out_file
);
3743 /* Release all memory allocated by flow. */
3744 free_basic_block_vars (0);
3746 /* Release all memory held by regsets now. */
3747 regset_release_memory ();
3749 timevar_pop (TV_FINAL
);
3753 /* Write DBX symbols if requested. */
3755 /* Note that for those inline functions where we don't initially
3756 know for certain that we will be generating an out-of-line copy,
3757 the first invocation of this routine (rest_of_compilation) will
3758 skip over this code by doing a `goto exit_rest_of_compilation;'.
3759 Later on, finish_compilation will call rest_of_compilation again
3760 for those inline functions that need to have out-of-line copies
3761 generated. During that call, we *will* be routed past here. */
3763 timevar_push (TV_SYMOUT
);
3764 (*debug_hooks
->function_decl
) (decl
);
3765 timevar_pop (TV_SYMOUT
);
3767 exit_rest_of_compilation
:
3769 /* In case the function was not output,
3770 don't leave any temporary anonymous types
3771 queued up for sdb output. */
3772 #ifdef SDB_DEBUGGING_INFO
3773 if (write_symbols
== SDB_DEBUG
)
3774 sdbout_types (NULL_TREE
);
3777 reload_completed
= 0;
3778 flow2_completed
= 0;
3781 timevar_push (TV_FINAL
);
3783 /* Clear out the insn_length contents now that they are no
3785 init_insn_lengths ();
3787 /* Clear out the real_constant_chain before some of the rtx's
3788 it runs through become garbage. */
3789 clear_const_double_mem ();
3791 /* Show no temporary slots allocated. */
3794 free_basic_block_vars (0);
3796 timevar_pop (TV_FINAL
);
3798 /* Make sure volatile mem refs aren't considered valid operands for
3799 arithmetic insns. We must call this here if this is a nested inline
3800 function, since the above code leaves us in the init_recog state
3801 (from final.c), and the function context push/pop code does not
3802 save/restore volatile_ok.
3804 ??? Maybe it isn't necessary for expand_start_function to call this
3805 anymore if we do it here? */
3807 init_recog_no_volatile ();
3809 /* We're done with this function. Free up memory if we can. */
3810 free_after_parsing (cfun
);
3811 if (! DECL_DEFER_OUTPUT (decl
))
3813 free_after_compilation (cfun
);
3815 /* Clear integrate.c's pointer to the cfun structure we just
3817 DECL_SAVED_INSNS (decl
) = 0;
3823 timevar_pop (TV_REST_OF_COMPILATION
);
3833 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3834 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3835 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3836 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3837 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3838 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"));
3840 for (i
= ARRAY_SIZE (f_options
); i
--;)
3842 const char *description
= f_options
[i
].description
;
3844 if (description
!= NULL
&& * description
!= 0)
3845 printf (" -f%-21s %s\n",
3846 f_options
[i
].string
, _(description
));
3849 printf (_(" -O[number] Set optimisation level to [number]\n"));
3850 printf (_(" -Os Optimise for space rather than speed\n"));
3851 for (i
= LAST_PARAM
; i
--;)
3853 const char *description
= compiler_params
[i
].help
;
3854 const int length
= 21-strlen(compiler_params
[i
].option
);
3856 if (description
!= NULL
&& * description
!= 0)
3857 printf (" --param %s=<value>%.*s%s\n",
3858 compiler_params
[i
].option
,
3859 length
> 0 ? length
: 1, " ",
3862 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3863 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3864 printf (_(" -w Suppress warnings\n"));
3865 printf (_(" -W Enable extra warnings\n"));
3867 for (i
= ARRAY_SIZE (W_options
); i
--;)
3869 const char *description
= W_options
[i
].description
;
3871 if (description
!= NULL
&& * description
!= 0)
3872 printf (" -W%-21s %s\n",
3873 W_options
[i
].string
, _(description
));
3876 printf (_(" -Wunused Enable unused warnings\n"));
3877 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3878 printf (_(" -p Enable function profiling\n"));
3879 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3880 printf (_(" -a Enable block profiling \n"));
3882 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3883 printf (_(" -ax Enable jump profiling \n"));
3885 printf (_(" -o <file> Place output into <file> \n"));
3887 -G <number> Put global and static data smaller than <number>\n\
3888 bytes into a special section (on some targets)\n"));
3890 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3892 if (debug_args
[i
].description
!= NULL
)
3893 printf (" -g%-21s %s\n",
3894 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3897 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3898 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3899 printf (_(" -version Display the compiler's version\n"));
3900 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3901 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3902 #if defined INSN_SCHEDULING
3903 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3905 printf (_(" --help Display this information\n"));
3910 /* Display descriptions of language specific options.
3911 If there is no description, note that there is an undocumented option.
3912 If the description is empty, do not display anything. (This allows
3913 options to be deliberately undocumented, for whatever reason).
3914 If the option string is missing, then this is a marker, indicating
3915 that the description string is in fact the name of a language, whose
3916 language specific options are to follow. */
3918 if (ARRAY_SIZE (documented_lang_options
) > 1)
3920 printf (_("\nLanguage specific options:\n"));
3922 for (i
= 0; i
< ARRAY_SIZE (documented_lang_options
); i
++)
3924 const char *description
= documented_lang_options
[i
].description
;
3925 const char *option
= documented_lang_options
[i
].option
;
3927 if (description
== NULL
)
3932 printf (_(" %-23.23s [undocumented]\n"), option
);
3934 else if (*description
== 0)
3936 else if (option
== NULL
)
3940 (_("\nThere are undocumented %s specific options as well.\n"),
3944 printf (_("\n Options for %s:\n"), description
);
3949 printf (" %-23.23s %s\n", option
, _(description
));
3954 printf (_("\nThere are undocumented %s specific options as well.\n"),
3957 display_target_options ();
3961 display_target_options ()
3965 if (ARRAY_SIZE (target_switches
) > 1
3966 #ifdef TARGET_OPTIONS
3967 || ARRAY_SIZE (target_options
) > 1
3975 printf (_("\nTarget specific options:\n"));
3977 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3979 const char *option
= target_switches
[i
].name
;
3980 const char *description
= target_switches
[i
].description
;
3982 if (option
== NULL
|| *option
== 0)
3984 else if (description
== NULL
)
3989 printf (_(" -m%-23.23s [undocumented]\n"), option
);
3991 else if (* description
!= 0)
3992 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
3995 #ifdef TARGET_OPTIONS
3996 for (i
= ARRAY_SIZE (target_options
); i
--;)
3998 const char *option
= target_options
[i
].prefix
;
3999 const char *description
= target_options
[i
].description
;
4001 if (option
== NULL
|| *option
== 0)
4003 else if (description
== NULL
)
4008 printf (_(" -m%-23.23s [undocumented]\n"), option
);
4010 else if (* description
!= 0)
4011 doc
+= printf (" -m%-23.23s %s\n", option
, _(description
));
4017 printf (_("\nThere are undocumented target specific options as well.\n"));
4019 printf (_(" They exist, but they are not documented.\n"));
4024 /* Parse a -d... comand line switch. */
4027 decode_d_option (arg
)
4036 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4037 dump_file
[i
].enabled
= 1;
4043 flag_print_asm_name
= 1;
4046 flag_dump_rtl_in_asm
= 1;
4047 flag_print_asm_name
= 1;
4050 graph_dump_format
= vcg
;
4053 rtl_dump_and_exit
= 1;
4058 case 'D': /* These are handled by the preprocessor. */
4064 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4065 if (c
== dump_file
[i
].debug_switch
)
4067 dump_file
[i
].enabled
= 1;
4072 warning ("unrecognized gcc debugging option: %c", c
);
4077 /* Parse a -f... comand line switch. ARG is the value after the -f.
4078 It is safe to access 'ARG - 2' to generate the full switch name.
4079 Return the number of strings consumed. */
4082 decode_f_option (arg
)
4086 const char *option_value
= NULL
;
4088 /* Search for the option in the table of binary f options. */
4089 for (j
= ARRAY_SIZE (f_options
); j
--;)
4091 if (!strcmp (arg
, f_options
[j
].string
))
4093 *f_options
[j
].variable
= f_options
[j
].on_value
;
4097 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4098 && ! strcmp (arg
+ 3, f_options
[j
].string
))
4100 *f_options
[j
].variable
= ! f_options
[j
].on_value
;
4105 if (!strcmp (arg
, "fast-math"))
4106 set_fast_math_flags();
4107 else if (!strcmp (arg
, "no-fast-math"))
4108 set_no_fast_math_flags();
4109 else if ((option_value
= skip_leading_substring (arg
, "inline-limit-"))
4110 || (option_value
= skip_leading_substring (arg
, "inline-limit=")))
4113 read_integral_parameter (option_value
, arg
- 2,
4115 set_param_value ("max-inline-insns", val
);
4117 #ifdef INSN_SCHEDULING
4118 else if ((option_value
= skip_leading_substring (arg
, "sched-verbose=")))
4119 fix_sched_param ("verbose", option_value
);
4121 else if ((option_value
= skip_leading_substring (arg
, "fixed-")))
4122 fix_register (option_value
, 1, 1);
4123 else if ((option_value
= skip_leading_substring (arg
, "call-used-")))
4124 fix_register (option_value
, 0, 1);
4125 else if ((option_value
= skip_leading_substring (arg
, "call-saved-")))
4126 fix_register (option_value
, 0, 0);
4127 else if ((option_value
= skip_leading_substring (arg
, "align-loops=")))
4128 align_loops
= read_integral_parameter (option_value
, arg
- 2, align_loops
);
4129 else if ((option_value
= skip_leading_substring (arg
, "align-functions=")))
4131 = read_integral_parameter (option_value
, arg
- 2, align_functions
);
4132 else if ((option_value
= skip_leading_substring (arg
, "align-jumps=")))
4133 align_jumps
= read_integral_parameter (option_value
, arg
- 2, align_jumps
);
4134 else if ((option_value
= skip_leading_substring (arg
, "align-labels=")))
4136 = read_integral_parameter (option_value
, arg
- 2, align_labels
);
4137 else if ((option_value
4138 = skip_leading_substring (arg
, "stack-limit-register=")))
4140 int reg
= decode_reg_name (option_value
);
4142 error ("unrecognized register name `%s'", option_value
);
4144 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
4146 else if ((option_value
4147 = skip_leading_substring (arg
, "stack-limit-symbol=")))
4150 nm
= ggc_strdup (option_value
);
4151 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, nm
);
4153 else if ((option_value
4154 = skip_leading_substring (arg
, "message-length=")))
4155 output_set_maximum_length
4156 (&global_dc
->buffer
, read_integral_parameter
4157 (option_value
, arg
- 2, diagnostic_line_cutoff (global_dc
)));
4158 else if ((option_value
4159 = skip_leading_substring (arg
, "diagnostics-show-location=")))
4161 if (!strcmp (option_value
, "once"))
4162 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
4163 else if (!strcmp (option_value
, "every-line"))
4164 diagnostic_prefixing_rule (global_dc
)
4165 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
4167 error ("Unrecognized option `%s'", arg
- 2);
4169 else if (!strcmp (arg
, "no-stack-limit"))
4170 stack_limit_rtx
= NULL_RTX
;
4171 else if (!strcmp (arg
, "preprocessed"))
4172 /* Recognise this switch but do nothing. This prevents warnings
4173 about an unrecognized switch if cpplib has not been linked in. */
4181 /* Parse a -W... comand line switch. ARG is the value after the -W.
4182 It is safe to access 'ARG - 2' to generate the full switch name.
4183 Return the number of strings consumed. */
4186 decode_W_option (arg
)
4189 const char *option_value
= NULL
;
4192 /* Search for the option in the table of binary W options. */
4194 for (j
= ARRAY_SIZE (W_options
); j
--;)
4196 if (!strcmp (arg
, W_options
[j
].string
))
4198 *W_options
[j
].variable
= W_options
[j
].on_value
;
4202 if (arg
[0] == 'n' && arg
[1] == 'o' && arg
[2] == '-'
4203 && ! strcmp (arg
+ 3, W_options
[j
].string
))
4205 *W_options
[j
].variable
= ! W_options
[j
].on_value
;
4210 if ((option_value
= skip_leading_substring (arg
, "id-clash-")))
4211 warning ("-Wid-clash-LEN is no longer supported");
4212 else if ((option_value
= skip_leading_substring (arg
, "larger-than-")))
4214 larger_than_size
= read_integral_parameter (option_value
, arg
- 2, -1);
4216 warn_larger_than
= larger_than_size
!= -1;
4218 else if (!strcmp (arg
, "unused"))
4222 else if (!strcmp (arg
, "no-unused"))
4232 /* Parse a -g... comand line switch. ARG is the value after the -g.
4233 It is safe to access 'ARG - 2' to generate the full switch name.
4234 Return the number of strings consumed. */
4237 decode_g_option (arg
)
4240 static unsigned level
=0;
4241 /* A lot of code assumes write_symbols == NO_DEBUG if the
4242 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4243 of what debugging type has been selected). This records the
4244 selected type. It is an error to specify more than one
4246 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
4247 /* Non-zero if debugging format has been explicitly set.
4248 -g and -ggdb don't explicitly set the debugging format so
4249 -gdwarf -g3 is equivalent to -gdwarf3. */
4250 static int type_explicitly_set_p
= 0;
4251 /* Indexed by enum debug_info_type. */
4252 static const char *const debug_type_names
[] =
4254 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4257 /* The maximum admissible debug level value. */
4258 static const unsigned max_debug_level
= 3;
4260 /* Look up ARG in the table. */
4261 for (da
= debug_args
; da
->arg
; da
++)
4263 const int da_len
= strlen (da
->arg
);
4265 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
4267 enum debug_info_type type
= da
->debug_type
;
4268 const char *p
= arg
+ da_len
;
4270 if (*p
&& (*p
< '0' || *p
> '9'))
4273 /* A debug flag without a level defaults to level 2.
4274 Note we do not want to call read_integral_parameter
4275 for that case since it will call atoi which
4278 ??? We may want to generalize the interface to
4279 read_integral_parameter to better handle this case
4280 if this case shows up often. */
4282 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
4284 level
= (level
== 0) ? 2 : level
;
4286 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
4288 error ("use -gdwarf -g%d for DWARF v1, level %d",
4291 error ("use -gdwarf-2 for DWARF v2");
4294 if (level
> max_debug_level
)
4297 ignoring option `%s' due to invalid debug level specification",
4299 level
= debug_info_level
;
4302 if (type
== NO_DEBUG
)
4304 type
= PREFERRED_DEBUGGING_TYPE
;
4306 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
4308 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4309 type
= DWARF2_DEBUG
;
4311 #ifdef DBX_DEBUGGING_INFO
4318 if (type
== NO_DEBUG
)
4319 warning ("`%s': unknown or unsupported -g option", arg
- 2);
4321 /* Does it conflict with an already selected type? */
4322 if (type_explicitly_set_p
4323 /* -g/-ggdb don't conflict with anything. */
4324 && da
->debug_type
!= NO_DEBUG
4325 && type
!= selected_debug_type
)
4326 warning ("`%s' ignored, conflicts with `-g%s'",
4327 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
4330 /* If the format has already been set, -g/-ggdb
4331 only change the debug level. */
4332 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
4333 /* Don't change debugging type. */
4337 selected_debug_type
= type
;
4338 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
4341 write_symbols
= (level
== 0
4343 : selected_debug_type
);
4344 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
4345 debug_info_level
= (enum debug_info_level
) level
;
4358 /* Decode the first argument in the argv as a language-independent option.
4359 Return the number of strings consumed. */
4362 independent_decode_option (argc
, argv
)
4366 char *arg
= argv
[0];
4368 if (arg
[0] != '-' || arg
[1] == 0)
4380 if (!strcmp (arg
, "-help"))
4383 exit_after_options
= 1;
4386 if (!strcmp (arg
, "-target-help"))
4388 display_target_options ();
4389 exit_after_options
= 1;
4392 if (!strcmp (arg
, "-version"))
4394 print_version (stderr
, "");
4395 exit_after_options
= 1;
4398 /* Handle '--param <name>=<value>'. */
4399 if (strcmp (arg
, "-param") == 0)
4405 error ("-param option missing argument");
4409 /* Get the '<name>=<value>' parameter. */
4411 /* Look for the `='. */
4412 equal
= strchr (arg
, '=');
4414 error ("invalid --param option: %s", arg
);
4419 /* Zero out the `=' sign so that we get two separate strings. */
4421 /* Figure out what value is specified. */
4422 val
= read_integral_parameter (equal
+ 1, NULL
, INVALID_PARAM_VAL
);
4423 if (val
!= INVALID_PARAM_VAL
)
4424 set_param_value (arg
, val
);
4426 error ("invalid parameter value `%s'", equal
+ 1);
4441 /* Already been treated in main (). Do nothing. */
4445 set_target_switch (arg
+ 1);
4449 return decode_f_option (arg
+ 1);
4452 return decode_g_option (arg
+ 1);
4455 if (!strcmp (arg
, "dumpbase"))
4460 dump_base_name
= argv
[1];
4464 decode_d_option (arg
+ 1);
4468 if (!strcmp (arg
, "pedantic"))
4470 else if (!strcmp (arg
, "pedantic-errors"))
4471 flag_pedantic_errors
= pedantic
= 1;
4472 else if (arg
[1] == 0)
4479 if (!strcmp (arg
, "quiet"))
4486 if (!strcmp (arg
, "version"))
4494 inhibit_warnings
= 1;
4503 /* We save the value of warn_uninitialized, since if they put
4504 -Wuninitialized on the command line, we need to generate a
4505 warning about not using it without also specifying -O. */
4506 if (warn_uninitialized
!= 1)
4507 warn_uninitialized
= 2;
4510 return decode_W_option (arg
+ 1);
4516 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4517 warning ("`-a' option (basic block profile) not supported");
4519 profile_block_flag
= (profile_block_flag
< 2) ? 1 : 3;
4522 else if (!strcmp (arg
, "ax"))
4524 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4525 warning ("`-ax' option (jump profiling) not supported");
4527 profile_block_flag
= (!profile_block_flag
4528 || profile_block_flag
== 2) ? 2 : 3;
4531 else if (!strncmp (arg
, "aux-info", 8))
4538 aux_info_file_name
= argv
[1];
4539 flag_gen_aux_info
= 1;
4542 else if (arg
[8] == '=')
4544 aux_info_file_name
= arg
+ 9;
4545 flag_gen_aux_info
= 1;
4560 asm_file_name
= argv
[1];
4575 g_switch_val
= read_integral_parameter (argv
[1], 0, -1);
4580 g_switch_val
= read_integral_parameter (arg
+ 1, 0, -1);
4584 if (g_switch_val
== -1)
4588 g_switch_set
= TRUE
;
4589 g_switch_value
= g_switch_val
;
4599 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4600 Decode command args, then call compile_file.
4601 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4602 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4604 It is not safe to call this function more than once. */
4607 toplev_main (argc
, argv
)
4614 /* save in case md file wants to emit args as a comment. */
4618 p
= argv
[0] + strlen (argv
[0]);
4619 while (p
!= argv
[0] && !IS_DIR_SEPARATOR (p
[-1]))
4623 xmalloc_set_program_name (progname
);
4625 gcc_init_libintl ();
4627 /* Install handler for SIGFPE, which may be received while we do
4628 compile-time floating point arithmetic. */
4629 signal (SIGFPE
, float_signal
);
4631 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4633 signal (SIGSEGV
, crash_signal
);
4636 signal (SIGILL
, crash_signal
);
4639 signal (SIGBUS
, crash_signal
);
4642 signal (SIGABRT
, crash_signal
);
4644 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4645 signal (SIGIOT
, crash_signal
);
4648 decl_printable_name
= decl_name
;
4649 lang_expand_expr
= (lang_expand_expr_t
) do_abort
;
4651 /* Initialize whether `char' is signed. */
4652 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
4653 #ifdef DEFAULT_SHORT_ENUMS
4654 /* Initialize how much space enums occupy, by default. */
4655 flag_short_enums
= DEFAULT_SHORT_ENUMS
;
4658 /* Initialize the garbage-collector. */
4661 ggc_add_rtx_root (&stack_limit_rtx
, 1);
4662 ggc_add_tree_root (¤t_function_decl
, 1);
4663 ggc_add_tree_root (¤t_function_func_begin_label
, 1);
4665 /* Initialize the diagnostics reporting machinery. */
4666 diagnostic_initialize (global_dc
);
4668 /* Register the language-independent parameters. */
4669 add_params (lang_independent_params
, LAST_PARAM
);
4671 /* Perform language-specific options intialization. */
4672 if (lang_hooks
.init_options
)
4673 (*lang_hooks
.init_options
) ();
4675 /* Scan to see what optimization level has been specified. That will
4676 determine the default value of many flags. */
4677 for (i
= 1; i
< argc
; i
++)
4679 if (!strcmp (argv
[i
], "-O"))
4684 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
4686 /* Handle -Os, -O2, -O3, -O69, ... */
4687 char *p
= &argv
[i
][2];
4689 if ((p
[0] == 's') && (p
[1] == 0))
4693 /* Optimizing for size forces optimize to be 2. */
4698 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
4699 if (optimize_val
!= -1)
4701 optimize
= optimize_val
;
4710 flag_merge_constants
= 0;
4716 flag_thread_jumps
= 1;
4718 flag_delayed_branch
= 1;
4720 #ifdef CAN_DEBUG_WITHOUT_FP
4721 flag_omit_frame_pointer
= 1;
4723 flag_guess_branch_prob
= 1;
4728 flag_optimize_sibling_calls
= 1;
4729 flag_cse_follow_jumps
= 1;
4730 flag_cse_skip_blocks
= 1;
4732 flag_expensive_optimizations
= 1;
4733 flag_strength_reduce
= 1;
4734 flag_rerun_cse_after_loop
= 1;
4735 flag_rerun_loop_opt
= 1;
4736 flag_caller_saves
= 1;
4739 #ifdef INSN_SCHEDULING
4740 flag_schedule_insns
= 1;
4741 flag_schedule_insns_after_reload
= 1;
4744 flag_strict_aliasing
= 1;
4745 flag_delete_null_pointer_checks
= 1;
4746 flag_reorder_blocks
= 1;
4751 flag_inline_functions
= 1;
4752 flag_rename_registers
= 1;
4755 if (optimize
< 2 || optimize_size
)
4760 align_functions
= 1;
4763 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4766 set_target_switch ("");
4768 /* Unwind tables are always present in an ABI-conformant IA-64
4769 object file, so the default should be ON. */
4770 #ifdef IA64_UNWIND_INFO
4771 flag_unwind_tables
= IA64_UNWIND_INFO
;
4774 #ifdef OPTIMIZATION_OPTIONS
4775 /* Allow default optimizations to be specified on a per-machine basis. */
4776 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
4779 /* Initialize register usage now so switches may override. */
4782 /* Perform normal command line switch decoding. */
4783 for (i
= 1; i
< argc
;)
4786 int indep_processed
;
4788 /* Give the language a chance to decode the option for itself. */
4789 lang_processed
= (*lang_hooks
.decode_option
) (argc
- i
, argv
+ i
);
4791 if (lang_processed
>= 0)
4792 /* Now see if the option also has a language independent meaning.
4793 Some options are both language specific and language independent,
4795 indep_processed
= independent_decode_option (argc
- i
, argv
+ i
);
4798 lang_processed
= -lang_processed
;
4799 indep_processed
= 0;
4802 if (lang_processed
|| indep_processed
)
4803 i
+= MAX (lang_processed
, indep_processed
);
4806 const char *option
= NULL
;
4807 const char *lang
= NULL
;
4810 /* It is possible that the command line switch is not valid for the
4811 current language, but it is valid for another language. In order
4812 to be compatible with previous versions of the compiler (which
4813 did not issue an error message in this case) we check for this
4814 possibility here. If we do find a match, then if extra_warnings
4815 is set we generate a warning message, otherwise we will just
4816 ignore the option. */
4817 for (j
= 0; j
< ARRAY_SIZE (documented_lang_options
); j
++)
4819 option
= documented_lang_options
[j
].option
;
4822 lang
= documented_lang_options
[j
].description
;
4823 else if (! strncmp (argv
[i
], option
, strlen (option
)))
4827 if (j
!= ARRAY_SIZE (documented_lang_options
))
4831 warning ("Ignoring command line option '%s'", argv
[i
]);
4834 ("(It is valid for %s but not the selected language)",
4838 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'g')
4839 warning ("`%s': unknown or unsupported -g option", &argv
[i
][2]);
4841 error ("Unrecognized option `%s'", argv
[i
]);
4847 /* All command line options have been processed. */
4848 if (lang_hooks
.post_options
)
4849 (*lang_hooks
.post_options
) ();
4851 if (exit_after_options
)
4854 /* Checker uses the frame pointer. */
4855 if (flag_check_memory_usage
)
4856 flag_omit_frame_pointer
= 0;
4860 /* Inlining does not work if not optimizing,
4861 so force it not to be done. */
4865 /* The c_decode_option function and decode_option hook set
4866 this to `2' if -Wall is used, so we can avoid giving out
4867 lots of errors for people who don't realize what -Wall does. */
4868 if (warn_uninitialized
== 1)
4869 warning ("-Wuninitialized is not supported without -O");
4872 /* We do not currently support sibling-call optimization in the
4873 presence of exceptions. See PR2975 for a test-case that will
4874 fail if we try to combine both of these features. */
4875 if (flag_exceptions
)
4876 flag_optimize_sibling_calls
= 0;
4878 #ifdef OVERRIDE_OPTIONS
4879 /* Some machines may reject certain combinations of options. */
4883 /* Set up the align_*_log variables, defaulting them to 1 if they
4884 were still unset. */
4885 if (align_loops
<= 0) align_loops
= 1;
4886 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4887 if (align_jumps
<= 0) align_jumps
= 1;
4888 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4889 if (align_labels
<= 0) align_labels
= 1;
4890 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4891 if (align_functions
<= 0) align_functions
= 1;
4892 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4894 if (profile_block_flag
== 3)
4896 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4897 profile_block_flag
= 2;
4900 /* Unrolling all loops implies that standard loop unrolling must also
4902 if (flag_unroll_all_loops
)
4903 flag_unroll_loops
= 1;
4904 /* Loop unrolling requires that strength_reduction be on also. Silently
4905 turn on strength reduction here if it isn't already on. Also, the loop
4906 unrolling code assumes that cse will be run after loop, so that must
4907 be turned on also. */
4908 if (flag_unroll_loops
)
4910 flag_strength_reduce
= 1;
4911 flag_rerun_cse_after_loop
= 1;
4914 /* Warn about options that are not supported on this machine. */
4915 #ifndef INSN_SCHEDULING
4916 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4917 warning ("instruction scheduling not supported on this target machine");
4920 if (flag_delayed_branch
)
4921 warning ("this target machine does not have delayed branches");
4924 /* Some operating systems do not allow profiling without a frame
4926 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4928 && flag_omit_frame_pointer
)
4930 error ("profiling does not work without a frame pointer");
4931 flag_omit_frame_pointer
= 0;
4934 user_label_prefix
= USER_LABEL_PREFIX
;
4935 if (flag_leading_underscore
!= -1)
4937 /* If the default prefix is more complicated than "" or "_",
4938 issue a warning and ignore this option. */
4939 if (user_label_prefix
[0] == 0 ||
4940 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4942 user_label_prefix
= flag_leading_underscore
? "_" : "";
4945 warning ("-f%sleading-underscore not supported on this target machine",
4946 flag_leading_underscore
? "" : "no-");
4949 /* If we are in verbose mode, write out the version and maybe all the
4950 option flags in use. */
4953 print_version (stderr
, "");
4955 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4958 compile_file (filename
);
4961 return (FATAL_EXIT_CODE
);
4963 return (FATAL_EXIT_CODE
);
4964 return (SUCCESS_EXIT_CODE
);
4967 /* Decode -m switches. */
4968 /* Decode the switch -mNAME. */
4971 set_target_switch (name
)
4975 int valid_target_option
= 0;
4977 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4978 if (!strcmp (target_switches
[j
].name
, name
))
4980 if (target_switches
[j
].value
< 0)
4981 target_flags
&= ~-target_switches
[j
].value
;
4983 target_flags
|= target_switches
[j
].value
;
4984 valid_target_option
= 1;
4987 #ifdef TARGET_OPTIONS
4988 if (!valid_target_option
)
4989 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4991 int len
= strlen (target_options
[j
].prefix
);
4992 if (!strncmp (target_options
[j
].prefix
, name
, len
))
4994 *target_options
[j
].variable
= name
+ len
;
4995 valid_target_option
= 1;
5000 if (!valid_target_option
)
5001 error ("Invalid option `%s'", name
);
5004 /* Print version information to FILE.
5005 Each line begins with INDENT (for the case where FILE is the
5006 assembler output file). */
5009 print_version (file
, indent
)
5014 #define __VERSION__ "[?]"
5018 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5020 "%s%s%s version %s (%s) compiled by CC.\n"
5022 , indent
, *indent
!= 0 ? " " : "",
5023 language_string
, version_string
, TARGET_NAME
,
5024 indent
, __VERSION__
);
5027 /* Print an option value and return the adjusted position in the line.
5028 ??? We don't handle error returns from fprintf (disk full); presumably
5029 other code will catch a disk full though. */
5032 print_single_switch (file
, pos
, max
, indent
, sep
, term
, type
, name
)
5035 const char *indent
, *sep
, *term
, *type
, *name
;
5037 /* The ultrix fprintf returns 0 on success, so compute the result we want
5038 here since we need it for the following test. */
5039 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
5044 fprintf (file
, "%s", term
);
5049 fprintf (file
, "%s", indent
);
5050 pos
= strlen (indent
);
5052 fprintf (file
, "%s%s%s", sep
, type
, name
);
5057 /* Print active target switches to FILE.
5058 POS is the current cursor position and MAX is the size of a "line".
5059 Each line begins with INDENT and ends with TERM.
5060 Each switch is separated from the next by SEP. */
5063 print_switch_values (file
, pos
, max
, indent
, sep
, term
)
5066 const char *indent
, *sep
, *term
;
5071 /* Print the options as passed. */
5073 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
5074 _("options passed: "), "");
5076 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
5080 if (strcmp (*p
, "-o") == 0)
5086 if (strcmp (*p
, "-quiet") == 0)
5088 if (strcmp (*p
, "-version") == 0)
5093 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
5096 fprintf (file
, "%s", term
);
5098 /* Print the -f and -m options that have been enabled.
5099 We don't handle language specific options but printing argv
5102 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
5103 _("options enabled: "), "");
5105 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
5106 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
5107 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5108 "-f", f_options
[j
].string
);
5110 /* Print target specific options. */
5112 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
5113 if (target_switches
[j
].name
[0] != '\0'
5114 && target_switches
[j
].value
> 0
5115 && ((target_switches
[j
].value
& target_flags
)
5116 == target_switches
[j
].value
))
5118 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5119 "-m", target_switches
[j
].name
);
5122 #ifdef TARGET_OPTIONS
5123 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
5124 if (*target_options
[j
].variable
!= NULL
)
5127 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
5128 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
5129 prefix
, *target_options
[j
].variable
);
5133 fprintf (file
, "%s", term
);